1 /* DWARF 2 debugging format support for GDB.
3 Copyright (C) 1994-2018 Free Software Foundation, Inc.
5 Adapted by Gary Funck (gary@intrepid.com), Intrepid Technology,
6 Inc. with support from Florida State University (under contract
7 with the Ada Joint Program Office), and Silicon Graphics, Inc.
8 Initial contribution by Brent Benson, Harris Computer Systems, Inc.,
9 based on Fred Fish's (Cygnus Support) implementation of DWARF 1
12 This file is part of GDB.
14 This program is free software; you can redistribute it and/or modify
15 it under the terms of the GNU General Public License as published by
16 the Free Software Foundation; either version 3 of the License, or
17 (at your option) any later version.
19 This program is distributed in the hope that it will be useful,
20 but WITHOUT ANY WARRANTY; without even the implied warranty of
21 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
22 GNU General Public License for more details.
24 You should have received a copy of the GNU General Public License
25 along with this program. If not, see <http://www.gnu.org/licenses/>. */
27 /* FIXME: Various die-reading functions need to be more careful with
28 reading off the end of the section.
29 E.g., load_partial_dies, read_partial_die. */
40 #include "gdb-demangle.h"
41 #include "expression.h"
42 #include "filenames.h" /* for DOSish file names */
45 #include "complaints.h"
47 #include "dwarf2expr.h"
48 #include "dwarf2loc.h"
49 #include "cp-support.h"
55 #include "typeprint.h"
58 #include "completer.h"
63 #include "gdbcore.h" /* for gnutarget */
64 #include "gdb/gdb-index.h"
69 #include "filestuff.h"
71 #include "namespace.h"
72 #include "common/gdb_unlinker.h"
73 #include "common/function-view.h"
74 #include "common/gdb_optional.h"
75 #include "common/underlying.h"
76 #include "common/byte-vector.h"
77 #include "common/hash_enum.h"
78 #include "filename-seen-cache.h"
81 #include <sys/types.h>
83 #include <unordered_set>
84 #include <unordered_map>
88 #include <forward_list>
89 #include "rust-lang.h"
90 #include "common/pathstuff.h"
92 /* When == 1, print basic high level tracing messages.
93 When > 1, be more verbose.
94 This is in contrast to the low level DIE reading of dwarf_die_debug. */
95 static unsigned int dwarf_read_debug = 0;
97 /* When non-zero, dump DIEs after they are read in. */
98 static unsigned int dwarf_die_debug = 0;
100 /* When non-zero, dump line number entries as they are read in. */
101 static unsigned int dwarf_line_debug = 0;
103 /* When non-zero, cross-check physname against demangler. */
104 static int check_physname = 0;
106 /* When non-zero, do not reject deprecated .gdb_index sections. */
107 static int use_deprecated_index_sections = 0;
109 static const struct objfile_data *dwarf2_objfile_data_key;
111 /* The "aclass" indices for various kinds of computed DWARF symbols. */
113 static int dwarf2_locexpr_index;
114 static int dwarf2_loclist_index;
115 static int dwarf2_locexpr_block_index;
116 static int dwarf2_loclist_block_index;
118 /* A descriptor for dwarf sections.
120 S.ASECTION, SIZE are typically initialized when the objfile is first
121 scanned. BUFFER, READIN are filled in later when the section is read.
122 If the section contained compressed data then SIZE is updated to record
123 the uncompressed size of the section.
125 DWP file format V2 introduces a wrinkle that is easiest to handle by
126 creating the concept of virtual sections contained within a real section.
127 In DWP V2 the sections of the input DWO files are concatenated together
128 into one section, but section offsets are kept relative to the original
130 If this is a virtual dwp-v2 section, S.CONTAINING_SECTION is a backlink to
131 the real section this "virtual" section is contained in, and BUFFER,SIZE
132 describe the virtual section. */
134 struct dwarf2_section_info
138 /* If this is a real section, the bfd section. */
140 /* If this is a virtual section, pointer to the containing ("real")
142 struct dwarf2_section_info *containing_section;
144 /* Pointer to section data, only valid if readin. */
145 const gdb_byte *buffer;
146 /* The size of the section, real or virtual. */
148 /* If this is a virtual section, the offset in the real section.
149 Only valid if is_virtual. */
150 bfd_size_type virtual_offset;
151 /* True if we have tried to read this section. */
153 /* True if this is a virtual section, False otherwise.
154 This specifies which of s.section and s.containing_section to use. */
158 typedef struct dwarf2_section_info dwarf2_section_info_def;
159 DEF_VEC_O (dwarf2_section_info_def);
161 /* All offsets in the index are of this type. It must be
162 architecture-independent. */
163 typedef uint32_t offset_type;
165 DEF_VEC_I (offset_type);
167 /* Ensure only legit values are used. */
168 #define DW2_GDB_INDEX_SYMBOL_STATIC_SET_VALUE(cu_index, value) \
170 gdb_assert ((unsigned int) (value) <= 1); \
171 GDB_INDEX_SYMBOL_STATIC_SET_VALUE((cu_index), (value)); \
174 /* Ensure only legit values are used. */
175 #define DW2_GDB_INDEX_SYMBOL_KIND_SET_VALUE(cu_index, value) \
177 gdb_assert ((value) >= GDB_INDEX_SYMBOL_KIND_TYPE \
178 && (value) <= GDB_INDEX_SYMBOL_KIND_OTHER); \
179 GDB_INDEX_SYMBOL_KIND_SET_VALUE((cu_index), (value)); \
182 /* Ensure we don't use more than the alloted nuber of bits for the CU. */
183 #define DW2_GDB_INDEX_CU_SET_VALUE(cu_index, value) \
185 gdb_assert (((value) & ~GDB_INDEX_CU_MASK) == 0); \
186 GDB_INDEX_CU_SET_VALUE((cu_index), (value)); \
191 /* Convert VALUE between big- and little-endian. */
194 byte_swap (offset_type value)
198 result = (value & 0xff) << 24;
199 result |= (value & 0xff00) << 8;
200 result |= (value & 0xff0000) >> 8;
201 result |= (value & 0xff000000) >> 24;
205 #define MAYBE_SWAP(V) byte_swap (V)
208 #define MAYBE_SWAP(V) static_cast<offset_type> (V)
209 #endif /* WORDS_BIGENDIAN */
211 /* An index into a (C++) symbol name component in a symbol name as
212 recorded in the mapped_index's symbol table. For each C++ symbol
213 in the symbol table, we record one entry for the start of each
214 component in the symbol in a table of name components, and then
215 sort the table, in order to be able to binary search symbol names,
216 ignoring leading namespaces, both completion and regular look up.
217 For example, for symbol "A::B::C", we'll have an entry that points
218 to "A::B::C", another that points to "B::C", and another for "C".
219 Note that function symbols in GDB index have no parameter
220 information, just the function/method names. You can convert a
221 name_component to a "const char *" using the
222 'mapped_index::symbol_name_at(offset_type)' method. */
224 struct name_component
226 /* Offset in the symbol name where the component starts. Stored as
227 a (32-bit) offset instead of a pointer to save memory and improve
228 locality on 64-bit architectures. */
229 offset_type name_offset;
231 /* The symbol's index in the symbol and constant pool tables of a
236 /* Base class containing bits shared by both .gdb_index and
237 .debug_name indexes. */
239 struct mapped_index_base
241 /* The name_component table (a sorted vector). See name_component's
242 description above. */
243 std::vector<name_component> name_components;
245 /* How NAME_COMPONENTS is sorted. */
246 enum case_sensitivity name_components_casing;
248 /* Return the number of names in the symbol table. */
249 virtual size_t symbol_name_count () const = 0;
251 /* Get the name of the symbol at IDX in the symbol table. */
252 virtual const char *symbol_name_at (offset_type idx) const = 0;
254 /* Return whether the name at IDX in the symbol table should be
256 virtual bool symbol_name_slot_invalid (offset_type idx) const
261 /* Build the symbol name component sorted vector, if we haven't
263 void build_name_components ();
265 /* Returns the lower (inclusive) and upper (exclusive) bounds of the
266 possible matches for LN_NO_PARAMS in the name component
268 std::pair<std::vector<name_component>::const_iterator,
269 std::vector<name_component>::const_iterator>
270 find_name_components_bounds (const lookup_name_info &ln_no_params) const;
272 /* Prevent deleting/destroying via a base class pointer. */
274 ~mapped_index_base() = default;
277 /* A description of the mapped index. The file format is described in
278 a comment by the code that writes the index. */
279 struct mapped_index final : public mapped_index_base
281 /* A slot/bucket in the symbol table hash. */
282 struct symbol_table_slot
284 const offset_type name;
285 const offset_type vec;
288 /* Index data format version. */
291 /* The total length of the buffer. */
294 /* The address table data. */
295 gdb::array_view<const gdb_byte> address_table;
297 /* The symbol table, implemented as a hash table. */
298 gdb::array_view<symbol_table_slot> symbol_table;
300 /* A pointer to the constant pool. */
301 const char *constant_pool;
303 bool symbol_name_slot_invalid (offset_type idx) const override
305 const auto &bucket = this->symbol_table[idx];
306 return bucket.name == 0 && bucket.vec;
309 /* Convenience method to get at the name of the symbol at IDX in the
311 const char *symbol_name_at (offset_type idx) const override
312 { return this->constant_pool + MAYBE_SWAP (this->symbol_table[idx].name); }
314 size_t symbol_name_count () const override
315 { return this->symbol_table.size (); }
318 /* A description of the mapped .debug_names.
319 Uninitialized map has CU_COUNT 0. */
320 struct mapped_debug_names final : public mapped_index_base
322 mapped_debug_names (struct dwarf2_per_objfile *dwarf2_per_objfile_)
323 : dwarf2_per_objfile (dwarf2_per_objfile_)
326 struct dwarf2_per_objfile *dwarf2_per_objfile;
327 bfd_endian dwarf5_byte_order;
328 bool dwarf5_is_dwarf64;
329 bool augmentation_is_gdb;
331 uint32_t cu_count = 0;
332 uint32_t tu_count, bucket_count, name_count;
333 const gdb_byte *cu_table_reordered, *tu_table_reordered;
334 const uint32_t *bucket_table_reordered, *hash_table_reordered;
335 const gdb_byte *name_table_string_offs_reordered;
336 const gdb_byte *name_table_entry_offs_reordered;
337 const gdb_byte *entry_pool;
344 /* Attribute name DW_IDX_*. */
347 /* Attribute form DW_FORM_*. */
350 /* Value if FORM is DW_FORM_implicit_const. */
351 LONGEST implicit_const;
353 std::vector<attr> attr_vec;
356 std::unordered_map<ULONGEST, index_val> abbrev_map;
358 const char *namei_to_name (uint32_t namei) const;
360 /* Implementation of the mapped_index_base virtual interface, for
361 the name_components cache. */
363 const char *symbol_name_at (offset_type idx) const override
364 { return namei_to_name (idx); }
366 size_t symbol_name_count () const override
367 { return this->name_count; }
370 typedef struct dwarf2_per_cu_data *dwarf2_per_cu_ptr;
371 DEF_VEC_P (dwarf2_per_cu_ptr);
375 int nr_uniq_abbrev_tables;
377 int nr_symtab_sharers;
378 int nr_stmt_less_type_units;
379 int nr_all_type_units_reallocs;
382 /* Collection of data recorded per objfile.
383 This hangs off of dwarf2_objfile_data_key. */
385 struct dwarf2_per_objfile : public allocate_on_obstack
387 /* Construct a dwarf2_per_objfile for OBJFILE. NAMES points to the
388 dwarf2 section names, or is NULL if the standard ELF names are
390 dwarf2_per_objfile (struct objfile *objfile,
391 const dwarf2_debug_sections *names);
393 ~dwarf2_per_objfile ();
395 DISABLE_COPY_AND_ASSIGN (dwarf2_per_objfile);
397 /* Free all cached compilation units. */
398 void free_cached_comp_units ();
400 /* This function is mapped across the sections and remembers the
401 offset and size of each of the debugging sections we are
403 void locate_sections (bfd *abfd, asection *sectp,
404 const dwarf2_debug_sections &names);
407 dwarf2_section_info info {};
408 dwarf2_section_info abbrev {};
409 dwarf2_section_info line {};
410 dwarf2_section_info loc {};
411 dwarf2_section_info loclists {};
412 dwarf2_section_info macinfo {};
413 dwarf2_section_info macro {};
414 dwarf2_section_info str {};
415 dwarf2_section_info line_str {};
416 dwarf2_section_info ranges {};
417 dwarf2_section_info rnglists {};
418 dwarf2_section_info addr {};
419 dwarf2_section_info frame {};
420 dwarf2_section_info eh_frame {};
421 dwarf2_section_info gdb_index {};
422 dwarf2_section_info debug_names {};
423 dwarf2_section_info debug_aranges {};
425 VEC (dwarf2_section_info_def) *types = NULL;
428 struct objfile *objfile = NULL;
430 /* Table of all the compilation units. This is used to locate
431 the target compilation unit of a particular reference. */
432 struct dwarf2_per_cu_data **all_comp_units = NULL;
434 /* The number of compilation units in ALL_COMP_UNITS. */
435 int n_comp_units = 0;
437 /* The number of .debug_types-related CUs. */
438 int n_type_units = 0;
440 /* The number of elements allocated in all_type_units.
441 If there are skeleton-less TUs, we add them to all_type_units lazily. */
442 int n_allocated_type_units = 0;
444 /* The .debug_types-related CUs (TUs).
445 This is stored in malloc space because we may realloc it. */
446 struct signatured_type **all_type_units = NULL;
448 /* Table of struct type_unit_group objects.
449 The hash key is the DW_AT_stmt_list value. */
450 htab_t type_unit_groups {};
452 /* A table mapping .debug_types signatures to its signatured_type entry.
453 This is NULL if the .debug_types section hasn't been read in yet. */
454 htab_t signatured_types {};
456 /* Type unit statistics, to see how well the scaling improvements
458 struct tu_stats tu_stats {};
460 /* A chain of compilation units that are currently read in, so that
461 they can be freed later. */
462 dwarf2_per_cu_data *read_in_chain = NULL;
464 /* A table mapping DW_AT_dwo_name values to struct dwo_file objects.
465 This is NULL if the table hasn't been allocated yet. */
468 /* True if we've checked for whether there is a DWP file. */
469 bool dwp_checked = false;
471 /* The DWP file if there is one, or NULL. */
472 struct dwp_file *dwp_file = NULL;
474 /* The shared '.dwz' file, if one exists. This is used when the
475 original data was compressed using 'dwz -m'. */
476 struct dwz_file *dwz_file = NULL;
478 /* A flag indicating whether this objfile has a section loaded at a
480 bool has_section_at_zero = false;
482 /* True if we are using the mapped index,
483 or we are faking it for OBJF_READNOW's sake. */
484 bool using_index = false;
486 /* The mapped index, or NULL if .gdb_index is missing or not being used. */
487 mapped_index *index_table = NULL;
489 /* The mapped index, or NULL if .debug_names is missing or not being used. */
490 std::unique_ptr<mapped_debug_names> debug_names_table;
492 /* When using index_table, this keeps track of all quick_file_names entries.
493 TUs typically share line table entries with a CU, so we maintain a
494 separate table of all line table entries to support the sharing.
495 Note that while there can be way more TUs than CUs, we've already
496 sorted all the TUs into "type unit groups", grouped by their
497 DW_AT_stmt_list value. Therefore the only sharing done here is with a
498 CU and its associated TU group if there is one. */
499 htab_t quick_file_names_table {};
501 /* Set during partial symbol reading, to prevent queueing of full
503 bool reading_partial_symbols = false;
505 /* Table mapping type DIEs to their struct type *.
506 This is NULL if not allocated yet.
507 The mapping is done via (CU/TU + DIE offset) -> type. */
508 htab_t die_type_hash {};
510 /* The CUs we recently read. */
511 VEC (dwarf2_per_cu_ptr) *just_read_cus = NULL;
513 /* Table containing line_header indexed by offset and offset_in_dwz. */
514 htab_t line_header_hash {};
516 /* Table containing all filenames. This is an optional because the
517 table is lazily constructed on first access. */
518 gdb::optional<filename_seen_cache> filenames_cache;
521 /* Get the dwarf2_per_objfile associated to OBJFILE. */
523 struct dwarf2_per_objfile *
524 get_dwarf2_per_objfile (struct objfile *objfile)
526 return ((struct dwarf2_per_objfile *)
527 objfile_data (objfile, dwarf2_objfile_data_key));
530 /* Set the dwarf2_per_objfile associated to OBJFILE. */
533 set_dwarf2_per_objfile (struct objfile *objfile,
534 struct dwarf2_per_objfile *dwarf2_per_objfile)
536 gdb_assert (get_dwarf2_per_objfile (objfile) == NULL);
537 set_objfile_data (objfile, dwarf2_objfile_data_key, dwarf2_per_objfile);
540 /* Default names of the debugging sections. */
542 /* Note that if the debugging section has been compressed, it might
543 have a name like .zdebug_info. */
545 static const struct dwarf2_debug_sections dwarf2_elf_names =
547 { ".debug_info", ".zdebug_info" },
548 { ".debug_abbrev", ".zdebug_abbrev" },
549 { ".debug_line", ".zdebug_line" },
550 { ".debug_loc", ".zdebug_loc" },
551 { ".debug_loclists", ".zdebug_loclists" },
552 { ".debug_macinfo", ".zdebug_macinfo" },
553 { ".debug_macro", ".zdebug_macro" },
554 { ".debug_str", ".zdebug_str" },
555 { ".debug_line_str", ".zdebug_line_str" },
556 { ".debug_ranges", ".zdebug_ranges" },
557 { ".debug_rnglists", ".zdebug_rnglists" },
558 { ".debug_types", ".zdebug_types" },
559 { ".debug_addr", ".zdebug_addr" },
560 { ".debug_frame", ".zdebug_frame" },
561 { ".eh_frame", NULL },
562 { ".gdb_index", ".zgdb_index" },
563 { ".debug_names", ".zdebug_names" },
564 { ".debug_aranges", ".zdebug_aranges" },
568 /* List of DWO/DWP sections. */
570 static const struct dwop_section_names
572 struct dwarf2_section_names abbrev_dwo;
573 struct dwarf2_section_names info_dwo;
574 struct dwarf2_section_names line_dwo;
575 struct dwarf2_section_names loc_dwo;
576 struct dwarf2_section_names loclists_dwo;
577 struct dwarf2_section_names macinfo_dwo;
578 struct dwarf2_section_names macro_dwo;
579 struct dwarf2_section_names str_dwo;
580 struct dwarf2_section_names str_offsets_dwo;
581 struct dwarf2_section_names types_dwo;
582 struct dwarf2_section_names cu_index;
583 struct dwarf2_section_names tu_index;
587 { ".debug_abbrev.dwo", ".zdebug_abbrev.dwo" },
588 { ".debug_info.dwo", ".zdebug_info.dwo" },
589 { ".debug_line.dwo", ".zdebug_line.dwo" },
590 { ".debug_loc.dwo", ".zdebug_loc.dwo" },
591 { ".debug_loclists.dwo", ".zdebug_loclists.dwo" },
592 { ".debug_macinfo.dwo", ".zdebug_macinfo.dwo" },
593 { ".debug_macro.dwo", ".zdebug_macro.dwo" },
594 { ".debug_str.dwo", ".zdebug_str.dwo" },
595 { ".debug_str_offsets.dwo", ".zdebug_str_offsets.dwo" },
596 { ".debug_types.dwo", ".zdebug_types.dwo" },
597 { ".debug_cu_index", ".zdebug_cu_index" },
598 { ".debug_tu_index", ".zdebug_tu_index" },
601 /* local data types */
603 /* The data in a compilation unit header, after target2host
604 translation, looks like this. */
605 struct comp_unit_head
609 unsigned char addr_size;
610 unsigned char signed_addr_p;
611 sect_offset abbrev_sect_off;
613 /* Size of file offsets; either 4 or 8. */
614 unsigned int offset_size;
616 /* Size of the length field; either 4 or 12. */
617 unsigned int initial_length_size;
619 enum dwarf_unit_type unit_type;
621 /* Offset to the first byte of this compilation unit header in the
622 .debug_info section, for resolving relative reference dies. */
623 sect_offset sect_off;
625 /* Offset to first die in this cu from the start of the cu.
626 This will be the first byte following the compilation unit header. */
627 cu_offset first_die_cu_offset;
629 /* 64-bit signature of this type unit - it is valid only for
630 UNIT_TYPE DW_UT_type. */
633 /* For types, offset in the type's DIE of the type defined by this TU. */
634 cu_offset type_cu_offset_in_tu;
637 /* Type used for delaying computation of method physnames.
638 See comments for compute_delayed_physnames. */
639 struct delayed_method_info
641 /* The type to which the method is attached, i.e., its parent class. */
644 /* The index of the method in the type's function fieldlists. */
647 /* The index of the method in the fieldlist. */
650 /* The name of the DIE. */
653 /* The DIE associated with this method. */
654 struct die_info *die;
657 /* Internal state when decoding a particular compilation unit. */
660 explicit dwarf2_cu (struct dwarf2_per_cu_data *per_cu);
663 DISABLE_COPY_AND_ASSIGN (dwarf2_cu);
665 /* The header of the compilation unit. */
666 struct comp_unit_head header {};
668 /* Base address of this compilation unit. */
669 CORE_ADDR base_address = 0;
671 /* Non-zero if base_address has been set. */
674 /* The language we are debugging. */
675 enum language language = language_unknown;
676 const struct language_defn *language_defn = nullptr;
678 const char *producer = nullptr;
680 /* The generic symbol table building routines have separate lists for
681 file scope symbols and all all other scopes (local scopes). So
682 we need to select the right one to pass to add_symbol_to_list().
683 We do it by keeping a pointer to the correct list in list_in_scope.
685 FIXME: The original dwarf code just treated the file scope as the
686 first local scope, and all other local scopes as nested local
687 scopes, and worked fine. Check to see if we really need to
688 distinguish these in buildsym.c. */
689 struct pending **list_in_scope = nullptr;
691 /* Hash table holding all the loaded partial DIEs
692 with partial_die->offset.SECT_OFF as hash. */
693 htab_t partial_dies = nullptr;
695 /* Storage for things with the same lifetime as this read-in compilation
696 unit, including partial DIEs. */
697 auto_obstack comp_unit_obstack;
699 /* When multiple dwarf2_cu structures are living in memory, this field
700 chains them all together, so that they can be released efficiently.
701 We will probably also want a generation counter so that most-recently-used
702 compilation units are cached... */
703 struct dwarf2_per_cu_data *read_in_chain = nullptr;
705 /* Backlink to our per_cu entry. */
706 struct dwarf2_per_cu_data *per_cu;
708 /* How many compilation units ago was this CU last referenced? */
711 /* A hash table of DIE cu_offset for following references with
712 die_info->offset.sect_off as hash. */
713 htab_t die_hash = nullptr;
715 /* Full DIEs if read in. */
716 struct die_info *dies = nullptr;
718 /* A set of pointers to dwarf2_per_cu_data objects for compilation
719 units referenced by this one. Only set during full symbol processing;
720 partial symbol tables do not have dependencies. */
721 htab_t dependencies = nullptr;
723 /* Header data from the line table, during full symbol processing. */
724 struct line_header *line_header = nullptr;
725 /* Non-NULL if LINE_HEADER is owned by this DWARF_CU. Otherwise,
726 it's owned by dwarf2_per_objfile::line_header_hash. If non-NULL,
727 this is the DW_TAG_compile_unit die for this CU. We'll hold on
728 to the line header as long as this DIE is being processed. See
729 process_die_scope. */
730 die_info *line_header_die_owner = nullptr;
732 /* A list of methods which need to have physnames computed
733 after all type information has been read. */
734 std::vector<delayed_method_info> method_list;
736 /* To be copied to symtab->call_site_htab. */
737 htab_t call_site_htab = nullptr;
739 /* Non-NULL if this CU came from a DWO file.
740 There is an invariant here that is important to remember:
741 Except for attributes copied from the top level DIE in the "main"
742 (or "stub") file in preparation for reading the DWO file
743 (e.g., DW_AT_GNU_addr_base), we KISS: there is only *one* CU.
744 Either there isn't a DWO file (in which case this is NULL and the point
745 is moot), or there is and either we're not going to read it (in which
746 case this is NULL) or there is and we are reading it (in which case this
748 struct dwo_unit *dwo_unit = nullptr;
750 /* The DW_AT_addr_base attribute if present, zero otherwise
751 (zero is a valid value though).
752 Note this value comes from the Fission stub CU/TU's DIE. */
753 ULONGEST addr_base = 0;
755 /* The DW_AT_ranges_base attribute if present, zero otherwise
756 (zero is a valid value though).
757 Note this value comes from the Fission stub CU/TU's DIE.
758 Also note that the value is zero in the non-DWO case so this value can
759 be used without needing to know whether DWO files are in use or not.
760 N.B. This does not apply to DW_AT_ranges appearing in
761 DW_TAG_compile_unit dies. This is a bit of a wart, consider if ever
762 DW_AT_ranges appeared in the DW_TAG_compile_unit of DWO DIEs: then
763 DW_AT_ranges_base *would* have to be applied, and we'd have to care
764 whether the DW_AT_ranges attribute came from the skeleton or DWO. */
765 ULONGEST ranges_base = 0;
767 /* When reading debug info generated by older versions of rustc, we
768 have to rewrite some union types to be struct types with a
769 variant part. This rewriting must be done after the CU is fully
770 read in, because otherwise at the point of rewriting some struct
771 type might not have been fully processed. So, we keep a list of
772 all such types here and process them after expansion. */
773 std::vector<struct type *> rust_unions;
775 /* Mark used when releasing cached dies. */
776 unsigned int mark : 1;
778 /* This CU references .debug_loc. See the symtab->locations_valid field.
779 This test is imperfect as there may exist optimized debug code not using
780 any location list and still facing inlining issues if handled as
781 unoptimized code. For a future better test see GCC PR other/32998. */
782 unsigned int has_loclist : 1;
784 /* These cache the results for producer_is_* fields. CHECKED_PRODUCER is set
785 if all the producer_is_* fields are valid. This information is cached
786 because profiling CU expansion showed excessive time spent in
787 producer_is_gxx_lt_4_6. */
788 unsigned int checked_producer : 1;
789 unsigned int producer_is_gxx_lt_4_6 : 1;
790 unsigned int producer_is_gcc_lt_4_3 : 1;
791 unsigned int producer_is_icc_lt_14 : 1;
793 /* When set, the file that we're processing is known to have
794 debugging info for C++ namespaces. GCC 3.3.x did not produce
795 this information, but later versions do. */
797 unsigned int processing_has_namespace_info : 1;
799 struct partial_die_info *find_partial_die (sect_offset sect_off);
802 /* Persistent data held for a compilation unit, even when not
803 processing it. We put a pointer to this structure in the
804 read_symtab_private field of the psymtab. */
806 struct dwarf2_per_cu_data
808 /* The start offset and length of this compilation unit.
809 NOTE: Unlike comp_unit_head.length, this length includes
811 If the DIE refers to a DWO file, this is always of the original die,
813 sect_offset sect_off;
816 /* DWARF standard version this data has been read from (such as 4 or 5). */
819 /* Flag indicating this compilation unit will be read in before
820 any of the current compilation units are processed. */
821 unsigned int queued : 1;
823 /* This flag will be set when reading partial DIEs if we need to load
824 absolutely all DIEs for this compilation unit, instead of just the ones
825 we think are interesting. It gets set if we look for a DIE in the
826 hash table and don't find it. */
827 unsigned int load_all_dies : 1;
829 /* Non-zero if this CU is from .debug_types.
830 Struct dwarf2_per_cu_data is contained in struct signatured_type iff
832 unsigned int is_debug_types : 1;
834 /* Non-zero if this CU is from the .dwz file. */
835 unsigned int is_dwz : 1;
837 /* Non-zero if reading a TU directly from a DWO file, bypassing the stub.
838 This flag is only valid if is_debug_types is true.
839 We can't read a CU directly from a DWO file: There are required
840 attributes in the stub. */
841 unsigned int reading_dwo_directly : 1;
843 /* Non-zero if the TU has been read.
844 This is used to assist the "Stay in DWO Optimization" for Fission:
845 When reading a DWO, it's faster to read TUs from the DWO instead of
846 fetching them from random other DWOs (due to comdat folding).
847 If the TU has already been read, the optimization is unnecessary
848 (and unwise - we don't want to change where gdb thinks the TU lives
850 This flag is only valid if is_debug_types is true. */
851 unsigned int tu_read : 1;
853 /* The section this CU/TU lives in.
854 If the DIE refers to a DWO file, this is always the original die,
856 struct dwarf2_section_info *section;
858 /* Set to non-NULL iff this CU is currently loaded. When it gets freed out
859 of the CU cache it gets reset to NULL again. This is left as NULL for
860 dummy CUs (a CU header, but nothing else). */
861 struct dwarf2_cu *cu;
863 /* The corresponding dwarf2_per_objfile. */
864 struct dwarf2_per_objfile *dwarf2_per_objfile;
866 /* When dwarf2_per_objfile->using_index is true, the 'quick' field
867 is active. Otherwise, the 'psymtab' field is active. */
870 /* The partial symbol table associated with this compilation unit,
871 or NULL for unread partial units. */
872 struct partial_symtab *psymtab;
874 /* Data needed by the "quick" functions. */
875 struct dwarf2_per_cu_quick_data *quick;
878 /* The CUs we import using DW_TAG_imported_unit. This is filled in
879 while reading psymtabs, used to compute the psymtab dependencies,
880 and then cleared. Then it is filled in again while reading full
881 symbols, and only deleted when the objfile is destroyed.
883 This is also used to work around a difference between the way gold
884 generates .gdb_index version <=7 and the way gdb does. Arguably this
885 is a gold bug. For symbols coming from TUs, gold records in the index
886 the CU that includes the TU instead of the TU itself. This breaks
887 dw2_lookup_symbol: It assumes that if the index says symbol X lives
888 in CU/TU Y, then one need only expand Y and a subsequent lookup in Y
889 will find X. Alas TUs live in their own symtab, so after expanding CU Y
890 we need to look in TU Z to find X. Fortunately, this is akin to
891 DW_TAG_imported_unit, so we just use the same mechanism: For
892 .gdb_index version <=7 this also records the TUs that the CU referred
893 to. Concurrently with this change gdb was modified to emit version 8
894 indices so we only pay a price for gold generated indices.
895 http://sourceware.org/bugzilla/show_bug.cgi?id=15021. */
896 VEC (dwarf2_per_cu_ptr) *imported_symtabs;
899 /* Entry in the signatured_types hash table. */
901 struct signatured_type
903 /* The "per_cu" object of this type.
904 This struct is used iff per_cu.is_debug_types.
905 N.B.: This is the first member so that it's easy to convert pointers
907 struct dwarf2_per_cu_data per_cu;
909 /* The type's signature. */
912 /* Offset in the TU of the type's DIE, as read from the TU header.
913 If this TU is a DWO stub and the definition lives in a DWO file
914 (specified by DW_AT_GNU_dwo_name), this value is unusable. */
915 cu_offset type_offset_in_tu;
917 /* Offset in the section of the type's DIE.
918 If the definition lives in a DWO file, this is the offset in the
919 .debug_types.dwo section.
920 The value is zero until the actual value is known.
921 Zero is otherwise not a valid section offset. */
922 sect_offset type_offset_in_section;
924 /* Type units are grouped by their DW_AT_stmt_list entry so that they
925 can share them. This points to the containing symtab. */
926 struct type_unit_group *type_unit_group;
929 The first time we encounter this type we fully read it in and install it
930 in the symbol tables. Subsequent times we only need the type. */
933 /* Containing DWO unit.
934 This field is valid iff per_cu.reading_dwo_directly. */
935 struct dwo_unit *dwo_unit;
938 typedef struct signatured_type *sig_type_ptr;
939 DEF_VEC_P (sig_type_ptr);
941 /* A struct that can be used as a hash key for tables based on DW_AT_stmt_list.
942 This includes type_unit_group and quick_file_names. */
944 struct stmt_list_hash
946 /* The DWO unit this table is from or NULL if there is none. */
947 struct dwo_unit *dwo_unit;
949 /* Offset in .debug_line or .debug_line.dwo. */
950 sect_offset line_sect_off;
953 /* Each element of dwarf2_per_objfile->type_unit_groups is a pointer to
954 an object of this type. */
956 struct type_unit_group
958 /* dwarf2read.c's main "handle" on a TU symtab.
959 To simplify things we create an artificial CU that "includes" all the
960 type units using this stmt_list so that the rest of the code still has
961 a "per_cu" handle on the symtab.
962 This PER_CU is recognized by having no section. */
963 #define IS_TYPE_UNIT_GROUP(per_cu) ((per_cu)->section == NULL)
964 struct dwarf2_per_cu_data per_cu;
966 /* The TUs that share this DW_AT_stmt_list entry.
967 This is added to while parsing type units to build partial symtabs,
968 and is deleted afterwards and not used again. */
969 VEC (sig_type_ptr) *tus;
971 /* The compunit symtab.
972 Type units in a group needn't all be defined in the same source file,
973 so we create an essentially anonymous symtab as the compunit symtab. */
974 struct compunit_symtab *compunit_symtab;
976 /* The data used to construct the hash key. */
977 struct stmt_list_hash hash;
979 /* The number of symtabs from the line header.
980 The value here must match line_header.num_file_names. */
981 unsigned int num_symtabs;
983 /* The symbol tables for this TU (obtained from the files listed in
985 WARNING: The order of entries here must match the order of entries
986 in the line header. After the first TU using this type_unit_group, the
987 line header for the subsequent TUs is recreated from this. This is done
988 because we need to use the same symtabs for each TU using the same
989 DW_AT_stmt_list value. Also note that symtabs may be repeated here,
990 there's no guarantee the line header doesn't have duplicate entries. */
991 struct symtab **symtabs;
994 /* These sections are what may appear in a (real or virtual) DWO file. */
998 struct dwarf2_section_info abbrev;
999 struct dwarf2_section_info line;
1000 struct dwarf2_section_info loc;
1001 struct dwarf2_section_info loclists;
1002 struct dwarf2_section_info macinfo;
1003 struct dwarf2_section_info macro;
1004 struct dwarf2_section_info str;
1005 struct dwarf2_section_info str_offsets;
1006 /* In the case of a virtual DWO file, these two are unused. */
1007 struct dwarf2_section_info info;
1008 VEC (dwarf2_section_info_def) *types;
1011 /* CUs/TUs in DWP/DWO files. */
1015 /* Backlink to the containing struct dwo_file. */
1016 struct dwo_file *dwo_file;
1018 /* The "id" that distinguishes this CU/TU.
1019 .debug_info calls this "dwo_id", .debug_types calls this "signature".
1020 Since signatures came first, we stick with it for consistency. */
1023 /* The section this CU/TU lives in, in the DWO file. */
1024 struct dwarf2_section_info *section;
1026 /* Same as dwarf2_per_cu_data:{sect_off,length} but in the DWO section. */
1027 sect_offset sect_off;
1028 unsigned int length;
1030 /* For types, offset in the type's DIE of the type defined by this TU. */
1031 cu_offset type_offset_in_tu;
1034 /* include/dwarf2.h defines the DWP section codes.
1035 It defines a max value but it doesn't define a min value, which we
1036 use for error checking, so provide one. */
1038 enum dwp_v2_section_ids
1043 /* Data for one DWO file.
1045 This includes virtual DWO files (a virtual DWO file is a DWO file as it
1046 appears in a DWP file). DWP files don't really have DWO files per se -
1047 comdat folding of types "loses" the DWO file they came from, and from
1048 a high level view DWP files appear to contain a mass of random types.
1049 However, to maintain consistency with the non-DWP case we pretend DWP
1050 files contain virtual DWO files, and we assign each TU with one virtual
1051 DWO file (generally based on the line and abbrev section offsets -
1052 a heuristic that seems to work in practice). */
1056 /* The DW_AT_GNU_dwo_name attribute.
1057 For virtual DWO files the name is constructed from the section offsets
1058 of abbrev,line,loc,str_offsets so that we combine virtual DWO files
1059 from related CU+TUs. */
1060 const char *dwo_name;
1062 /* The DW_AT_comp_dir attribute. */
1063 const char *comp_dir;
1065 /* The bfd, when the file is open. Otherwise this is NULL.
1066 This is unused(NULL) for virtual DWO files where we use dwp_file.dbfd. */
1069 /* The sections that make up this DWO file.
1070 Remember that for virtual DWO files in DWP V2, these are virtual
1071 sections (for lack of a better name). */
1072 struct dwo_sections sections;
1074 /* The CUs in the file.
1075 Each element is a struct dwo_unit. Multiple CUs per DWO are supported as
1076 an extension to handle LLVM's Link Time Optimization output (where
1077 multiple source files may be compiled into a single object/dwo pair). */
1080 /* Table of TUs in the file.
1081 Each element is a struct dwo_unit. */
1085 /* These sections are what may appear in a DWP file. */
1089 /* These are used by both DWP version 1 and 2. */
1090 struct dwarf2_section_info str;
1091 struct dwarf2_section_info cu_index;
1092 struct dwarf2_section_info tu_index;
1094 /* These are only used by DWP version 2 files.
1095 In DWP version 1 the .debug_info.dwo, .debug_types.dwo, and other
1096 sections are referenced by section number, and are not recorded here.
1097 In DWP version 2 there is at most one copy of all these sections, each
1098 section being (effectively) comprised of the concatenation of all of the
1099 individual sections that exist in the version 1 format.
1100 To keep the code simple we treat each of these concatenated pieces as a
1101 section itself (a virtual section?). */
1102 struct dwarf2_section_info abbrev;
1103 struct dwarf2_section_info info;
1104 struct dwarf2_section_info line;
1105 struct dwarf2_section_info loc;
1106 struct dwarf2_section_info macinfo;
1107 struct dwarf2_section_info macro;
1108 struct dwarf2_section_info str_offsets;
1109 struct dwarf2_section_info types;
1112 /* These sections are what may appear in a virtual DWO file in DWP version 1.
1113 A virtual DWO file is a DWO file as it appears in a DWP file. */
1115 struct virtual_v1_dwo_sections
1117 struct dwarf2_section_info abbrev;
1118 struct dwarf2_section_info line;
1119 struct dwarf2_section_info loc;
1120 struct dwarf2_section_info macinfo;
1121 struct dwarf2_section_info macro;
1122 struct dwarf2_section_info str_offsets;
1123 /* Each DWP hash table entry records one CU or one TU.
1124 That is recorded here, and copied to dwo_unit.section. */
1125 struct dwarf2_section_info info_or_types;
1128 /* Similar to virtual_v1_dwo_sections, but for DWP version 2.
1129 In version 2, the sections of the DWO files are concatenated together
1130 and stored in one section of that name. Thus each ELF section contains
1131 several "virtual" sections. */
1133 struct virtual_v2_dwo_sections
1135 bfd_size_type abbrev_offset;
1136 bfd_size_type abbrev_size;
1138 bfd_size_type line_offset;
1139 bfd_size_type line_size;
1141 bfd_size_type loc_offset;
1142 bfd_size_type loc_size;
1144 bfd_size_type macinfo_offset;
1145 bfd_size_type macinfo_size;
1147 bfd_size_type macro_offset;
1148 bfd_size_type macro_size;
1150 bfd_size_type str_offsets_offset;
1151 bfd_size_type str_offsets_size;
1153 /* Each DWP hash table entry records one CU or one TU.
1154 That is recorded here, and copied to dwo_unit.section. */
1155 bfd_size_type info_or_types_offset;
1156 bfd_size_type info_or_types_size;
1159 /* Contents of DWP hash tables. */
1161 struct dwp_hash_table
1163 uint32_t version, nr_columns;
1164 uint32_t nr_units, nr_slots;
1165 const gdb_byte *hash_table, *unit_table;
1170 const gdb_byte *indices;
1174 /* This is indexed by column number and gives the id of the section
1176 #define MAX_NR_V2_DWO_SECTIONS \
1177 (1 /* .debug_info or .debug_types */ \
1178 + 1 /* .debug_abbrev */ \
1179 + 1 /* .debug_line */ \
1180 + 1 /* .debug_loc */ \
1181 + 1 /* .debug_str_offsets */ \
1182 + 1 /* .debug_macro or .debug_macinfo */)
1183 int section_ids[MAX_NR_V2_DWO_SECTIONS];
1184 const gdb_byte *offsets;
1185 const gdb_byte *sizes;
1190 /* Data for one DWP file. */
1194 /* Name of the file. */
1197 /* File format version. */
1203 /* Section info for this file. */
1204 struct dwp_sections sections;
1206 /* Table of CUs in the file. */
1207 const struct dwp_hash_table *cus;
1209 /* Table of TUs in the file. */
1210 const struct dwp_hash_table *tus;
1212 /* Tables of loaded CUs/TUs. Each entry is a struct dwo_unit *. */
1216 /* Table to map ELF section numbers to their sections.
1217 This is only needed for the DWP V1 file format. */
1218 unsigned int num_sections;
1219 asection **elf_sections;
1222 /* This represents a '.dwz' file. */
1226 /* A dwz file can only contain a few sections. */
1227 struct dwarf2_section_info abbrev;
1228 struct dwarf2_section_info info;
1229 struct dwarf2_section_info str;
1230 struct dwarf2_section_info line;
1231 struct dwarf2_section_info macro;
1232 struct dwarf2_section_info gdb_index;
1233 struct dwarf2_section_info debug_names;
1235 /* The dwz's BFD. */
1239 /* Struct used to pass misc. parameters to read_die_and_children, et
1240 al. which are used for both .debug_info and .debug_types dies.
1241 All parameters here are unchanging for the life of the call. This
1242 struct exists to abstract away the constant parameters of die reading. */
1244 struct die_reader_specs
1246 /* The bfd of die_section. */
1249 /* The CU of the DIE we are parsing. */
1250 struct dwarf2_cu *cu;
1252 /* Non-NULL if reading a DWO file (including one packaged into a DWP). */
1253 struct dwo_file *dwo_file;
1255 /* The section the die comes from.
1256 This is either .debug_info or .debug_types, or the .dwo variants. */
1257 struct dwarf2_section_info *die_section;
1259 /* die_section->buffer. */
1260 const gdb_byte *buffer;
1262 /* The end of the buffer. */
1263 const gdb_byte *buffer_end;
1265 /* The value of the DW_AT_comp_dir attribute. */
1266 const char *comp_dir;
1268 /* The abbreviation table to use when reading the DIEs. */
1269 struct abbrev_table *abbrev_table;
1272 /* Type of function passed to init_cutu_and_read_dies, et.al. */
1273 typedef void (die_reader_func_ftype) (const struct die_reader_specs *reader,
1274 const gdb_byte *info_ptr,
1275 struct die_info *comp_unit_die,
1279 /* A 1-based directory index. This is a strong typedef to prevent
1280 accidentally using a directory index as a 0-based index into an
1282 enum class dir_index : unsigned int {};
1284 /* Likewise, a 1-based file name index. */
1285 enum class file_name_index : unsigned int {};
1289 file_entry () = default;
1291 file_entry (const char *name_, dir_index d_index_,
1292 unsigned int mod_time_, unsigned int length_)
1295 mod_time (mod_time_),
1299 /* Return the include directory at D_INDEX stored in LH. Returns
1300 NULL if D_INDEX is out of bounds. */
1301 const char *include_dir (const line_header *lh) const;
1303 /* The file name. Note this is an observing pointer. The memory is
1304 owned by debug_line_buffer. */
1305 const char *name {};
1307 /* The directory index (1-based). */
1308 dir_index d_index {};
1310 unsigned int mod_time {};
1312 unsigned int length {};
1314 /* True if referenced by the Line Number Program. */
1317 /* The associated symbol table, if any. */
1318 struct symtab *symtab {};
1321 /* The line number information for a compilation unit (found in the
1322 .debug_line section) begins with a "statement program header",
1323 which contains the following information. */
1330 /* Add an entry to the include directory table. */
1331 void add_include_dir (const char *include_dir);
1333 /* Add an entry to the file name table. */
1334 void add_file_name (const char *name, dir_index d_index,
1335 unsigned int mod_time, unsigned int length);
1337 /* Return the include dir at INDEX (1-based). Returns NULL if INDEX
1338 is out of bounds. */
1339 const char *include_dir_at (dir_index index) const
1341 /* Convert directory index number (1-based) to vector index
1343 size_t vec_index = to_underlying (index) - 1;
1345 if (vec_index >= include_dirs.size ())
1347 return include_dirs[vec_index];
1350 /* Return the file name at INDEX (1-based). Returns NULL if INDEX
1351 is out of bounds. */
1352 file_entry *file_name_at (file_name_index index)
1354 /* Convert file name index number (1-based) to vector index
1356 size_t vec_index = to_underlying (index) - 1;
1358 if (vec_index >= file_names.size ())
1360 return &file_names[vec_index];
1363 /* Const version of the above. */
1364 const file_entry *file_name_at (unsigned int index) const
1366 if (index >= file_names.size ())
1368 return &file_names[index];
1371 /* Offset of line number information in .debug_line section. */
1372 sect_offset sect_off {};
1374 /* OFFSET is for struct dwz_file associated with dwarf2_per_objfile. */
1375 unsigned offset_in_dwz : 1; /* Can't initialize bitfields in-class. */
1377 unsigned int total_length {};
1378 unsigned short version {};
1379 unsigned int header_length {};
1380 unsigned char minimum_instruction_length {};
1381 unsigned char maximum_ops_per_instruction {};
1382 unsigned char default_is_stmt {};
1384 unsigned char line_range {};
1385 unsigned char opcode_base {};
1387 /* standard_opcode_lengths[i] is the number of operands for the
1388 standard opcode whose value is i. This means that
1389 standard_opcode_lengths[0] is unused, and the last meaningful
1390 element is standard_opcode_lengths[opcode_base - 1]. */
1391 std::unique_ptr<unsigned char[]> standard_opcode_lengths;
1393 /* The include_directories table. Note these are observing
1394 pointers. The memory is owned by debug_line_buffer. */
1395 std::vector<const char *> include_dirs;
1397 /* The file_names table. */
1398 std::vector<file_entry> file_names;
1400 /* The start and end of the statement program following this
1401 header. These point into dwarf2_per_objfile->line_buffer. */
1402 const gdb_byte *statement_program_start {}, *statement_program_end {};
1405 typedef std::unique_ptr<line_header> line_header_up;
1408 file_entry::include_dir (const line_header *lh) const
1410 return lh->include_dir_at (d_index);
1413 /* When we construct a partial symbol table entry we only
1414 need this much information. */
1415 struct partial_die_info : public allocate_on_obstack
1417 partial_die_info (sect_offset sect_off, struct abbrev_info *abbrev);
1419 /* Disable assign but still keep copy ctor, which is needed
1420 load_partial_dies. */
1421 partial_die_info& operator=(const partial_die_info& rhs) = delete;
1423 /* Adjust the partial die before generating a symbol for it. This
1424 function may set the is_external flag or change the DIE's
1426 void fixup (struct dwarf2_cu *cu);
1428 /* Read a minimal amount of information into the minimal die
1430 const gdb_byte *read (const struct die_reader_specs *reader,
1431 const struct abbrev_info &abbrev,
1432 const gdb_byte *info_ptr);
1434 /* Offset of this DIE. */
1435 const sect_offset sect_off;
1437 /* DWARF-2 tag for this DIE. */
1438 const ENUM_BITFIELD(dwarf_tag) tag : 16;
1440 /* Assorted flags describing the data found in this DIE. */
1441 const unsigned int has_children : 1;
1443 unsigned int is_external : 1;
1444 unsigned int is_declaration : 1;
1445 unsigned int has_type : 1;
1446 unsigned int has_specification : 1;
1447 unsigned int has_pc_info : 1;
1448 unsigned int may_be_inlined : 1;
1450 /* This DIE has been marked DW_AT_main_subprogram. */
1451 unsigned int main_subprogram : 1;
1453 /* Flag set if the SCOPE field of this structure has been
1455 unsigned int scope_set : 1;
1457 /* Flag set if the DIE has a byte_size attribute. */
1458 unsigned int has_byte_size : 1;
1460 /* Flag set if the DIE has a DW_AT_const_value attribute. */
1461 unsigned int has_const_value : 1;
1463 /* Flag set if any of the DIE's children are template arguments. */
1464 unsigned int has_template_arguments : 1;
1466 /* Flag set if fixup has been called on this die. */
1467 unsigned int fixup_called : 1;
1469 /* Flag set if DW_TAG_imported_unit uses DW_FORM_GNU_ref_alt. */
1470 unsigned int is_dwz : 1;
1472 /* Flag set if spec_offset uses DW_FORM_GNU_ref_alt. */
1473 unsigned int spec_is_dwz : 1;
1475 /* The name of this DIE. Normally the value of DW_AT_name, but
1476 sometimes a default name for unnamed DIEs. */
1477 const char *name = nullptr;
1479 /* The linkage name, if present. */
1480 const char *linkage_name = nullptr;
1482 /* The scope to prepend to our children. This is generally
1483 allocated on the comp_unit_obstack, so will disappear
1484 when this compilation unit leaves the cache. */
1485 const char *scope = nullptr;
1487 /* Some data associated with the partial DIE. The tag determines
1488 which field is live. */
1491 /* The location description associated with this DIE, if any. */
1492 struct dwarf_block *locdesc;
1493 /* The offset of an import, for DW_TAG_imported_unit. */
1494 sect_offset sect_off;
1497 /* If HAS_PC_INFO, the PC range associated with this DIE. */
1498 CORE_ADDR lowpc = 0;
1499 CORE_ADDR highpc = 0;
1501 /* Pointer into the info_buffer (or types_buffer) pointing at the target of
1502 DW_AT_sibling, if any. */
1503 /* NOTE: This member isn't strictly necessary, partial_die_info::read
1504 could return DW_AT_sibling values to its caller load_partial_dies. */
1505 const gdb_byte *sibling = nullptr;
1507 /* If HAS_SPECIFICATION, the offset of the DIE referred to by
1508 DW_AT_specification (or DW_AT_abstract_origin or
1509 DW_AT_extension). */
1510 sect_offset spec_offset {};
1512 /* Pointers to this DIE's parent, first child, and next sibling,
1514 struct partial_die_info *die_parent = nullptr;
1515 struct partial_die_info *die_child = nullptr;
1516 struct partial_die_info *die_sibling = nullptr;
1518 friend struct partial_die_info *
1519 dwarf2_cu::find_partial_die (sect_offset sect_off);
1522 /* Only need to do look up in dwarf2_cu::find_partial_die. */
1523 partial_die_info (sect_offset sect_off)
1524 : partial_die_info (sect_off, DW_TAG_padding, 0)
1528 partial_die_info (sect_offset sect_off_, enum dwarf_tag tag_,
1530 : sect_off (sect_off_), tag (tag_), has_children (has_children_)
1535 has_specification = 0;
1538 main_subprogram = 0;
1541 has_const_value = 0;
1542 has_template_arguments = 0;
1549 /* This data structure holds the information of an abbrev. */
1552 unsigned int number; /* number identifying abbrev */
1553 enum dwarf_tag tag; /* dwarf tag */
1554 unsigned short has_children; /* boolean */
1555 unsigned short num_attrs; /* number of attributes */
1556 struct attr_abbrev *attrs; /* an array of attribute descriptions */
1557 struct abbrev_info *next; /* next in chain */
1562 ENUM_BITFIELD(dwarf_attribute) name : 16;
1563 ENUM_BITFIELD(dwarf_form) form : 16;
1565 /* It is valid only if FORM is DW_FORM_implicit_const. */
1566 LONGEST implicit_const;
1569 /* Size of abbrev_table.abbrev_hash_table. */
1570 #define ABBREV_HASH_SIZE 121
1572 /* Top level data structure to contain an abbreviation table. */
1576 explicit abbrev_table (sect_offset off)
1580 XOBNEWVEC (&abbrev_obstack, struct abbrev_info *, ABBREV_HASH_SIZE);
1581 memset (m_abbrevs, 0, ABBREV_HASH_SIZE * sizeof (struct abbrev_info *));
1584 DISABLE_COPY_AND_ASSIGN (abbrev_table);
1586 /* Allocate space for a struct abbrev_info object in
1588 struct abbrev_info *alloc_abbrev ();
1590 /* Add an abbreviation to the table. */
1591 void add_abbrev (unsigned int abbrev_number, struct abbrev_info *abbrev);
1593 /* Look up an abbrev in the table.
1594 Returns NULL if the abbrev is not found. */
1596 struct abbrev_info *lookup_abbrev (unsigned int abbrev_number);
1599 /* Where the abbrev table came from.
1600 This is used as a sanity check when the table is used. */
1601 const sect_offset sect_off;
1603 /* Storage for the abbrev table. */
1604 auto_obstack abbrev_obstack;
1608 /* Hash table of abbrevs.
1609 This is an array of size ABBREV_HASH_SIZE allocated in abbrev_obstack.
1610 It could be statically allocated, but the previous code didn't so we
1612 struct abbrev_info **m_abbrevs;
1615 typedef std::unique_ptr<struct abbrev_table> abbrev_table_up;
1617 /* Attributes have a name and a value. */
1620 ENUM_BITFIELD(dwarf_attribute) name : 16;
1621 ENUM_BITFIELD(dwarf_form) form : 15;
1623 /* Has DW_STRING already been updated by dwarf2_canonicalize_name? This
1624 field should be in u.str (existing only for DW_STRING) but it is kept
1625 here for better struct attribute alignment. */
1626 unsigned int string_is_canonical : 1;
1631 struct dwarf_block *blk;
1640 /* This data structure holds a complete die structure. */
1643 /* DWARF-2 tag for this DIE. */
1644 ENUM_BITFIELD(dwarf_tag) tag : 16;
1646 /* Number of attributes */
1647 unsigned char num_attrs;
1649 /* True if we're presently building the full type name for the
1650 type derived from this DIE. */
1651 unsigned char building_fullname : 1;
1653 /* True if this die is in process. PR 16581. */
1654 unsigned char in_process : 1;
1657 unsigned int abbrev;
1659 /* Offset in .debug_info or .debug_types section. */
1660 sect_offset sect_off;
1662 /* The dies in a compilation unit form an n-ary tree. PARENT
1663 points to this die's parent; CHILD points to the first child of
1664 this node; and all the children of a given node are chained
1665 together via their SIBLING fields. */
1666 struct die_info *child; /* Its first child, if any. */
1667 struct die_info *sibling; /* Its next sibling, if any. */
1668 struct die_info *parent; /* Its parent, if any. */
1670 /* An array of attributes, with NUM_ATTRS elements. There may be
1671 zero, but it's not common and zero-sized arrays are not
1672 sufficiently portable C. */
1673 struct attribute attrs[1];
1676 /* Get at parts of an attribute structure. */
1678 #define DW_STRING(attr) ((attr)->u.str)
1679 #define DW_STRING_IS_CANONICAL(attr) ((attr)->string_is_canonical)
1680 #define DW_UNSND(attr) ((attr)->u.unsnd)
1681 #define DW_BLOCK(attr) ((attr)->u.blk)
1682 #define DW_SND(attr) ((attr)->u.snd)
1683 #define DW_ADDR(attr) ((attr)->u.addr)
1684 #define DW_SIGNATURE(attr) ((attr)->u.signature)
1686 /* Blocks are a bunch of untyped bytes. */
1691 /* Valid only if SIZE is not zero. */
1692 const gdb_byte *data;
1695 #ifndef ATTR_ALLOC_CHUNK
1696 #define ATTR_ALLOC_CHUNK 4
1699 /* Allocate fields for structs, unions and enums in this size. */
1700 #ifndef DW_FIELD_ALLOC_CHUNK
1701 #define DW_FIELD_ALLOC_CHUNK 4
1704 /* FIXME: We might want to set this from BFD via bfd_arch_bits_per_byte,
1705 but this would require a corresponding change in unpack_field_as_long
1707 static int bits_per_byte = 8;
1709 /* When reading a variant or variant part, we track a bit more
1710 information about the field, and store it in an object of this
1713 struct variant_field
1715 /* If we see a DW_TAG_variant, then this will be the discriminant
1717 ULONGEST discriminant_value;
1718 /* If we see a DW_TAG_variant, then this will be set if this is the
1720 bool default_branch;
1721 /* While reading a DW_TAG_variant_part, this will be set if this
1722 field is the discriminant. */
1723 bool is_discriminant;
1728 struct nextfield *next;
1731 /* Extra information to describe a variant or variant part. */
1732 struct variant_field variant;
1738 struct nextfnfield *next;
1739 struct fn_field fnfield;
1746 struct nextfnfield *head;
1749 struct decl_field_list
1751 struct decl_field field;
1752 struct decl_field_list *next;
1755 /* The routines that read and process dies for a C struct or C++ class
1756 pass lists of data member fields and lists of member function fields
1757 in an instance of a field_info structure, as defined below. */
1760 /* List of data member and baseclasses fields. */
1761 struct nextfield *fields, *baseclasses;
1763 /* Number of fields (including baseclasses). */
1766 /* Number of baseclasses. */
1769 /* Set if the accesibility of one of the fields is not public. */
1770 int non_public_fields;
1772 /* Member function fieldlist array, contains name of possibly overloaded
1773 member function, number of overloaded member functions and a pointer
1774 to the head of the member function field chain. */
1775 struct fnfieldlist *fnfieldlists;
1777 /* Number of entries in the fnfieldlists array. */
1780 /* typedefs defined inside this class. TYPEDEF_FIELD_LIST contains head of
1781 a NULL terminated list of TYPEDEF_FIELD_LIST_COUNT elements. */
1782 struct decl_field_list *typedef_field_list;
1783 unsigned typedef_field_list_count;
1785 /* Nested types defined by this class and the number of elements in this
1787 struct decl_field_list *nested_types_list;
1788 unsigned nested_types_list_count;
1791 /* One item on the queue of compilation units to read in full symbols
1793 struct dwarf2_queue_item
1795 struct dwarf2_per_cu_data *per_cu;
1796 enum language pretend_language;
1797 struct dwarf2_queue_item *next;
1800 /* The current queue. */
1801 static struct dwarf2_queue_item *dwarf2_queue, *dwarf2_queue_tail;
1803 /* Loaded secondary compilation units are kept in memory until they
1804 have not been referenced for the processing of this many
1805 compilation units. Set this to zero to disable caching. Cache
1806 sizes of up to at least twenty will improve startup time for
1807 typical inter-CU-reference binaries, at an obvious memory cost. */
1808 static int dwarf_max_cache_age = 5;
1810 show_dwarf_max_cache_age (struct ui_file *file, int from_tty,
1811 struct cmd_list_element *c, const char *value)
1813 fprintf_filtered (file, _("The upper bound on the age of cached "
1814 "DWARF compilation units is %s.\n"),
1818 /* local function prototypes */
1820 static const char *get_section_name (const struct dwarf2_section_info *);
1822 static const char *get_section_file_name (const struct dwarf2_section_info *);
1824 static void dwarf2_find_base_address (struct die_info *die,
1825 struct dwarf2_cu *cu);
1827 static struct partial_symtab *create_partial_symtab
1828 (struct dwarf2_per_cu_data *per_cu, const char *name);
1830 static void build_type_psymtabs_reader (const struct die_reader_specs *reader,
1831 const gdb_byte *info_ptr,
1832 struct die_info *type_unit_die,
1833 int has_children, void *data);
1835 static void dwarf2_build_psymtabs_hard
1836 (struct dwarf2_per_objfile *dwarf2_per_objfile);
1838 static void scan_partial_symbols (struct partial_die_info *,
1839 CORE_ADDR *, CORE_ADDR *,
1840 int, struct dwarf2_cu *);
1842 static void add_partial_symbol (struct partial_die_info *,
1843 struct dwarf2_cu *);
1845 static void add_partial_namespace (struct partial_die_info *pdi,
1846 CORE_ADDR *lowpc, CORE_ADDR *highpc,
1847 int set_addrmap, struct dwarf2_cu *cu);
1849 static void add_partial_module (struct partial_die_info *pdi, CORE_ADDR *lowpc,
1850 CORE_ADDR *highpc, int set_addrmap,
1851 struct dwarf2_cu *cu);
1853 static void add_partial_enumeration (struct partial_die_info *enum_pdi,
1854 struct dwarf2_cu *cu);
1856 static void add_partial_subprogram (struct partial_die_info *pdi,
1857 CORE_ADDR *lowpc, CORE_ADDR *highpc,
1858 int need_pc, struct dwarf2_cu *cu);
1860 static void dwarf2_read_symtab (struct partial_symtab *,
1863 static void psymtab_to_symtab_1 (struct partial_symtab *);
1865 static abbrev_table_up abbrev_table_read_table
1866 (struct dwarf2_per_objfile *dwarf2_per_objfile, struct dwarf2_section_info *,
1869 static unsigned int peek_abbrev_code (bfd *, const gdb_byte *);
1871 static struct partial_die_info *load_partial_dies
1872 (const struct die_reader_specs *, const gdb_byte *, int);
1874 static struct partial_die_info *find_partial_die (sect_offset, int,
1875 struct dwarf2_cu *);
1877 static const gdb_byte *read_attribute (const struct die_reader_specs *,
1878 struct attribute *, struct attr_abbrev *,
1881 static unsigned int read_1_byte (bfd *, const gdb_byte *);
1883 static int read_1_signed_byte (bfd *, const gdb_byte *);
1885 static unsigned int read_2_bytes (bfd *, const gdb_byte *);
1887 static unsigned int read_4_bytes (bfd *, const gdb_byte *);
1889 static ULONGEST read_8_bytes (bfd *, const gdb_byte *);
1891 static CORE_ADDR read_address (bfd *, const gdb_byte *ptr, struct dwarf2_cu *,
1894 static LONGEST read_initial_length (bfd *, const gdb_byte *, unsigned int *);
1896 static LONGEST read_checked_initial_length_and_offset
1897 (bfd *, const gdb_byte *, const struct comp_unit_head *,
1898 unsigned int *, unsigned int *);
1900 static LONGEST read_offset (bfd *, const gdb_byte *,
1901 const struct comp_unit_head *,
1904 static LONGEST read_offset_1 (bfd *, const gdb_byte *, unsigned int);
1906 static sect_offset read_abbrev_offset
1907 (struct dwarf2_per_objfile *dwarf2_per_objfile,
1908 struct dwarf2_section_info *, sect_offset);
1910 static const gdb_byte *read_n_bytes (bfd *, const gdb_byte *, unsigned int);
1912 static const char *read_direct_string (bfd *, const gdb_byte *, unsigned int *);
1914 static const char *read_indirect_string
1915 (struct dwarf2_per_objfile *dwarf2_per_objfile, bfd *, const gdb_byte *,
1916 const struct comp_unit_head *, unsigned int *);
1918 static const char *read_indirect_line_string
1919 (struct dwarf2_per_objfile *dwarf2_per_objfile, bfd *, const gdb_byte *,
1920 const struct comp_unit_head *, unsigned int *);
1922 static const char *read_indirect_string_at_offset
1923 (struct dwarf2_per_objfile *dwarf2_per_objfile, bfd *abfd,
1924 LONGEST str_offset);
1926 static const char *read_indirect_string_from_dwz
1927 (struct objfile *objfile, struct dwz_file *, LONGEST);
1929 static LONGEST read_signed_leb128 (bfd *, const gdb_byte *, unsigned int *);
1931 static CORE_ADDR read_addr_index_from_leb128 (struct dwarf2_cu *,
1935 static const char *read_str_index (const struct die_reader_specs *reader,
1936 ULONGEST str_index);
1938 static void set_cu_language (unsigned int, struct dwarf2_cu *);
1940 static struct attribute *dwarf2_attr (struct die_info *, unsigned int,
1941 struct dwarf2_cu *);
1943 static struct attribute *dwarf2_attr_no_follow (struct die_info *,
1946 static const char *dwarf2_string_attr (struct die_info *die, unsigned int name,
1947 struct dwarf2_cu *cu);
1949 static int dwarf2_flag_true_p (struct die_info *die, unsigned name,
1950 struct dwarf2_cu *cu);
1952 static int die_is_declaration (struct die_info *, struct dwarf2_cu *cu);
1954 static struct die_info *die_specification (struct die_info *die,
1955 struct dwarf2_cu **);
1957 static line_header_up dwarf_decode_line_header (sect_offset sect_off,
1958 struct dwarf2_cu *cu);
1960 static void dwarf_decode_lines (struct line_header *, const char *,
1961 struct dwarf2_cu *, struct partial_symtab *,
1962 CORE_ADDR, int decode_mapping);
1964 static void dwarf2_start_subfile (const char *, const char *);
1966 static struct compunit_symtab *dwarf2_start_symtab (struct dwarf2_cu *,
1967 const char *, const char *,
1970 static struct symbol *new_symbol (struct die_info *, struct type *,
1971 struct dwarf2_cu *, struct symbol * = NULL);
1973 static void dwarf2_const_value (const struct attribute *, struct symbol *,
1974 struct dwarf2_cu *);
1976 static void dwarf2_const_value_attr (const struct attribute *attr,
1979 struct obstack *obstack,
1980 struct dwarf2_cu *cu, LONGEST *value,
1981 const gdb_byte **bytes,
1982 struct dwarf2_locexpr_baton **baton);
1984 static struct type *die_type (struct die_info *, struct dwarf2_cu *);
1986 static int need_gnat_info (struct dwarf2_cu *);
1988 static struct type *die_descriptive_type (struct die_info *,
1989 struct dwarf2_cu *);
1991 static void set_descriptive_type (struct type *, struct die_info *,
1992 struct dwarf2_cu *);
1994 static struct type *die_containing_type (struct die_info *,
1995 struct dwarf2_cu *);
1997 static struct type *lookup_die_type (struct die_info *, const struct attribute *,
1998 struct dwarf2_cu *);
2000 static struct type *read_type_die (struct die_info *, struct dwarf2_cu *);
2002 static struct type *read_type_die_1 (struct die_info *, struct dwarf2_cu *);
2004 static const char *determine_prefix (struct die_info *die, struct dwarf2_cu *);
2006 static char *typename_concat (struct obstack *obs, const char *prefix,
2007 const char *suffix, int physname,
2008 struct dwarf2_cu *cu);
2010 static void read_file_scope (struct die_info *, struct dwarf2_cu *);
2012 static void read_type_unit_scope (struct die_info *, struct dwarf2_cu *);
2014 static void read_func_scope (struct die_info *, struct dwarf2_cu *);
2016 static void read_lexical_block_scope (struct die_info *, struct dwarf2_cu *);
2018 static void read_call_site_scope (struct die_info *die, struct dwarf2_cu *cu);
2020 static void read_variable (struct die_info *die, struct dwarf2_cu *cu);
2022 static int dwarf2_ranges_read (unsigned, CORE_ADDR *, CORE_ADDR *,
2023 struct dwarf2_cu *, struct partial_symtab *);
2025 /* How dwarf2_get_pc_bounds constructed its *LOWPC and *HIGHPC return
2026 values. Keep the items ordered with increasing constraints compliance. */
2029 /* No attribute DW_AT_low_pc, DW_AT_high_pc or DW_AT_ranges was found. */
2030 PC_BOUNDS_NOT_PRESENT,
2032 /* Some of the attributes DW_AT_low_pc, DW_AT_high_pc or DW_AT_ranges
2033 were present but they do not form a valid range of PC addresses. */
2036 /* Discontiguous range was found - that is DW_AT_ranges was found. */
2039 /* Contiguous range was found - DW_AT_low_pc and DW_AT_high_pc were found. */
2043 static enum pc_bounds_kind dwarf2_get_pc_bounds (struct die_info *,
2044 CORE_ADDR *, CORE_ADDR *,
2046 struct partial_symtab *);
2048 static void get_scope_pc_bounds (struct die_info *,
2049 CORE_ADDR *, CORE_ADDR *,
2050 struct dwarf2_cu *);
2052 static void dwarf2_record_block_ranges (struct die_info *, struct block *,
2053 CORE_ADDR, struct dwarf2_cu *);
2055 static void dwarf2_add_field (struct field_info *, struct die_info *,
2056 struct dwarf2_cu *);
2058 static void dwarf2_attach_fields_to_type (struct field_info *,
2059 struct type *, struct dwarf2_cu *);
2061 static void dwarf2_add_member_fn (struct field_info *,
2062 struct die_info *, struct type *,
2063 struct dwarf2_cu *);
2065 static void dwarf2_attach_fn_fields_to_type (struct field_info *,
2067 struct dwarf2_cu *);
2069 static void process_structure_scope (struct die_info *, struct dwarf2_cu *);
2071 static void read_common_block (struct die_info *, struct dwarf2_cu *);
2073 static void read_namespace (struct die_info *die, struct dwarf2_cu *);
2075 static void read_module (struct die_info *die, struct dwarf2_cu *cu);
2077 static struct using_direct **using_directives (enum language);
2079 static void read_import_statement (struct die_info *die, struct dwarf2_cu *);
2081 static int read_namespace_alias (struct die_info *die, struct dwarf2_cu *cu);
2083 static struct type *read_module_type (struct die_info *die,
2084 struct dwarf2_cu *cu);
2086 static const char *namespace_name (struct die_info *die,
2087 int *is_anonymous, struct dwarf2_cu *);
2089 static void process_enumeration_scope (struct die_info *, struct dwarf2_cu *);
2091 static CORE_ADDR decode_locdesc (struct dwarf_block *, struct dwarf2_cu *);
2093 static enum dwarf_array_dim_ordering read_array_order (struct die_info *,
2094 struct dwarf2_cu *);
2096 static struct die_info *read_die_and_siblings_1
2097 (const struct die_reader_specs *, const gdb_byte *, const gdb_byte **,
2100 static struct die_info *read_die_and_siblings (const struct die_reader_specs *,
2101 const gdb_byte *info_ptr,
2102 const gdb_byte **new_info_ptr,
2103 struct die_info *parent);
2105 static const gdb_byte *read_full_die_1 (const struct die_reader_specs *,
2106 struct die_info **, const gdb_byte *,
2109 static const gdb_byte *read_full_die (const struct die_reader_specs *,
2110 struct die_info **, const gdb_byte *,
2113 static void process_die (struct die_info *, struct dwarf2_cu *);
2115 static const char *dwarf2_canonicalize_name (const char *, struct dwarf2_cu *,
2118 static const char *dwarf2_name (struct die_info *die, struct dwarf2_cu *);
2120 static const char *dwarf2_full_name (const char *name,
2121 struct die_info *die,
2122 struct dwarf2_cu *cu);
2124 static const char *dwarf2_physname (const char *name, struct die_info *die,
2125 struct dwarf2_cu *cu);
2127 static struct die_info *dwarf2_extension (struct die_info *die,
2128 struct dwarf2_cu **);
2130 static const char *dwarf_tag_name (unsigned int);
2132 static const char *dwarf_attr_name (unsigned int);
2134 static const char *dwarf_form_name (unsigned int);
2136 static const char *dwarf_bool_name (unsigned int);
2138 static const char *dwarf_type_encoding_name (unsigned int);
2140 static struct die_info *sibling_die (struct die_info *);
2142 static void dump_die_shallow (struct ui_file *, int indent, struct die_info *);
2144 static void dump_die_for_error (struct die_info *);
2146 static void dump_die_1 (struct ui_file *, int level, int max_level,
2149 /*static*/ void dump_die (struct die_info *, int max_level);
2151 static void store_in_ref_table (struct die_info *,
2152 struct dwarf2_cu *);
2154 static sect_offset dwarf2_get_ref_die_offset (const struct attribute *);
2156 static LONGEST dwarf2_get_attr_constant_value (const struct attribute *, int);
2158 static struct die_info *follow_die_ref_or_sig (struct die_info *,
2159 const struct attribute *,
2160 struct dwarf2_cu **);
2162 static struct die_info *follow_die_ref (struct die_info *,
2163 const struct attribute *,
2164 struct dwarf2_cu **);
2166 static struct die_info *follow_die_sig (struct die_info *,
2167 const struct attribute *,
2168 struct dwarf2_cu **);
2170 static struct type *get_signatured_type (struct die_info *, ULONGEST,
2171 struct dwarf2_cu *);
2173 static struct type *get_DW_AT_signature_type (struct die_info *,
2174 const struct attribute *,
2175 struct dwarf2_cu *);
2177 static void load_full_type_unit (struct dwarf2_per_cu_data *per_cu);
2179 static void read_signatured_type (struct signatured_type *);
2181 static int attr_to_dynamic_prop (const struct attribute *attr,
2182 struct die_info *die, struct dwarf2_cu *cu,
2183 struct dynamic_prop *prop);
2185 /* memory allocation interface */
2187 static struct dwarf_block *dwarf_alloc_block (struct dwarf2_cu *);
2189 static struct die_info *dwarf_alloc_die (struct dwarf2_cu *, int);
2191 static void dwarf_decode_macros (struct dwarf2_cu *, unsigned int, int);
2193 static int attr_form_is_block (const struct attribute *);
2195 static int attr_form_is_section_offset (const struct attribute *);
2197 static int attr_form_is_constant (const struct attribute *);
2199 static int attr_form_is_ref (const struct attribute *);
2201 static void fill_in_loclist_baton (struct dwarf2_cu *cu,
2202 struct dwarf2_loclist_baton *baton,
2203 const struct attribute *attr);
2205 static void dwarf2_symbol_mark_computed (const struct attribute *attr,
2207 struct dwarf2_cu *cu,
2210 static const gdb_byte *skip_one_die (const struct die_reader_specs *reader,
2211 const gdb_byte *info_ptr,
2212 struct abbrev_info *abbrev);
2214 static hashval_t partial_die_hash (const void *item);
2216 static int partial_die_eq (const void *item_lhs, const void *item_rhs);
2218 static struct dwarf2_per_cu_data *dwarf2_find_containing_comp_unit
2219 (sect_offset sect_off, unsigned int offset_in_dwz,
2220 struct dwarf2_per_objfile *dwarf2_per_objfile);
2222 static void prepare_one_comp_unit (struct dwarf2_cu *cu,
2223 struct die_info *comp_unit_die,
2224 enum language pretend_language);
2226 static void free_cached_comp_units (void *);
2228 static void age_cached_comp_units (struct dwarf2_per_objfile *dwarf2_per_objfile);
2230 static void free_one_cached_comp_unit (struct dwarf2_per_cu_data *);
2232 static struct type *set_die_type (struct die_info *, struct type *,
2233 struct dwarf2_cu *);
2235 static void create_all_comp_units (struct dwarf2_per_objfile *dwarf2_per_objfile);
2237 static int create_all_type_units (struct dwarf2_per_objfile *dwarf2_per_objfile);
2239 static void load_full_comp_unit (struct dwarf2_per_cu_data *,
2242 static void process_full_comp_unit (struct dwarf2_per_cu_data *,
2245 static void process_full_type_unit (struct dwarf2_per_cu_data *,
2248 static void dwarf2_add_dependence (struct dwarf2_cu *,
2249 struct dwarf2_per_cu_data *);
2251 static void dwarf2_mark (struct dwarf2_cu *);
2253 static void dwarf2_clear_marks (struct dwarf2_per_cu_data *);
2255 static struct type *get_die_type_at_offset (sect_offset,
2256 struct dwarf2_per_cu_data *);
2258 static struct type *get_die_type (struct die_info *die, struct dwarf2_cu *cu);
2260 static void queue_comp_unit (struct dwarf2_per_cu_data *per_cu,
2261 enum language pretend_language);
2263 static void process_queue (struct dwarf2_per_objfile *dwarf2_per_objfile);
2265 /* Class, the destructor of which frees all allocated queue entries. This
2266 will only have work to do if an error was thrown while processing the
2267 dwarf. If no error was thrown then the queue entries should have all
2268 been processed, and freed, as we went along. */
2270 class dwarf2_queue_guard
2273 dwarf2_queue_guard () = default;
2275 /* Free any entries remaining on the queue. There should only be
2276 entries left if we hit an error while processing the dwarf. */
2277 ~dwarf2_queue_guard ()
2279 struct dwarf2_queue_item *item, *last;
2281 item = dwarf2_queue;
2284 /* Anything still marked queued is likely to be in an
2285 inconsistent state, so discard it. */
2286 if (item->per_cu->queued)
2288 if (item->per_cu->cu != NULL)
2289 free_one_cached_comp_unit (item->per_cu);
2290 item->per_cu->queued = 0;
2298 dwarf2_queue = dwarf2_queue_tail = NULL;
2302 /* The return type of find_file_and_directory. Note, the enclosed
2303 string pointers are only valid while this object is valid. */
2305 struct file_and_directory
2307 /* The filename. This is never NULL. */
2310 /* The compilation directory. NULL if not known. If we needed to
2311 compute a new string, this points to COMP_DIR_STORAGE, otherwise,
2312 points directly to the DW_AT_comp_dir string attribute owned by
2313 the obstack that owns the DIE. */
2314 const char *comp_dir;
2316 /* If we needed to build a new string for comp_dir, this is what
2317 owns the storage. */
2318 std::string comp_dir_storage;
2321 static file_and_directory find_file_and_directory (struct die_info *die,
2322 struct dwarf2_cu *cu);
2324 static char *file_full_name (int file, struct line_header *lh,
2325 const char *comp_dir);
2327 /* Expected enum dwarf_unit_type for read_comp_unit_head. */
2328 enum class rcuh_kind { COMPILE, TYPE };
2330 static const gdb_byte *read_and_check_comp_unit_head
2331 (struct dwarf2_per_objfile* dwarf2_per_objfile,
2332 struct comp_unit_head *header,
2333 struct dwarf2_section_info *section,
2334 struct dwarf2_section_info *abbrev_section, const gdb_byte *info_ptr,
2335 rcuh_kind section_kind);
2337 static void init_cutu_and_read_dies
2338 (struct dwarf2_per_cu_data *this_cu, struct abbrev_table *abbrev_table,
2339 int use_existing_cu, int keep,
2340 die_reader_func_ftype *die_reader_func, void *data);
2342 static void init_cutu_and_read_dies_simple
2343 (struct dwarf2_per_cu_data *this_cu,
2344 die_reader_func_ftype *die_reader_func, void *data);
2346 static htab_t allocate_signatured_type_table (struct objfile *objfile);
2348 static htab_t allocate_dwo_unit_table (struct objfile *objfile);
2350 static struct dwo_unit *lookup_dwo_unit_in_dwp
2351 (struct dwarf2_per_objfile *dwarf2_per_objfile,
2352 struct dwp_file *dwp_file, const char *comp_dir,
2353 ULONGEST signature, int is_debug_types);
2355 static struct dwp_file *get_dwp_file
2356 (struct dwarf2_per_objfile *dwarf2_per_objfile);
2358 static struct dwo_unit *lookup_dwo_comp_unit
2359 (struct dwarf2_per_cu_data *, const char *, const char *, ULONGEST);
2361 static struct dwo_unit *lookup_dwo_type_unit
2362 (struct signatured_type *, const char *, const char *);
2364 static void queue_and_load_all_dwo_tus (struct dwarf2_per_cu_data *);
2366 static void free_dwo_file_cleanup (void *);
2368 struct free_dwo_file_cleanup_data
2370 struct dwo_file *dwo_file;
2371 struct dwarf2_per_objfile *dwarf2_per_objfile;
2374 static void process_cu_includes (struct dwarf2_per_objfile *dwarf2_per_objfile);
2376 static void check_producer (struct dwarf2_cu *cu);
2378 static void free_line_header_voidp (void *arg);
2380 /* Various complaints about symbol reading that don't abort the process. */
2383 dwarf2_statement_list_fits_in_line_number_section_complaint (void)
2385 complaint (&symfile_complaints,
2386 _("statement list doesn't fit in .debug_line section"));
2390 dwarf2_debug_line_missing_file_complaint (void)
2392 complaint (&symfile_complaints,
2393 _(".debug_line section has line data without a file"));
2397 dwarf2_debug_line_missing_end_sequence_complaint (void)
2399 complaint (&symfile_complaints,
2400 _(".debug_line section has line "
2401 "program sequence without an end"));
2405 dwarf2_complex_location_expr_complaint (void)
2407 complaint (&symfile_complaints, _("location expression too complex"));
2411 dwarf2_const_value_length_mismatch_complaint (const char *arg1, int arg2,
2414 complaint (&symfile_complaints,
2415 _("const value length mismatch for '%s', got %d, expected %d"),
2420 dwarf2_section_buffer_overflow_complaint (struct dwarf2_section_info *section)
2422 complaint (&symfile_complaints,
2423 _("debug info runs off end of %s section"
2425 get_section_name (section),
2426 get_section_file_name (section));
2430 dwarf2_macro_malformed_definition_complaint (const char *arg1)
2432 complaint (&symfile_complaints,
2433 _("macro debug info contains a "
2434 "malformed macro definition:\n`%s'"),
2439 dwarf2_invalid_attrib_class_complaint (const char *arg1, const char *arg2)
2441 complaint (&symfile_complaints,
2442 _("invalid attribute class or form for '%s' in '%s'"),
2446 /* Hash function for line_header_hash. */
2449 line_header_hash (const struct line_header *ofs)
2451 return to_underlying (ofs->sect_off) ^ ofs->offset_in_dwz;
2454 /* Hash function for htab_create_alloc_ex for line_header_hash. */
2457 line_header_hash_voidp (const void *item)
2459 const struct line_header *ofs = (const struct line_header *) item;
2461 return line_header_hash (ofs);
2464 /* Equality function for line_header_hash. */
2467 line_header_eq_voidp (const void *item_lhs, const void *item_rhs)
2469 const struct line_header *ofs_lhs = (const struct line_header *) item_lhs;
2470 const struct line_header *ofs_rhs = (const struct line_header *) item_rhs;
2472 return (ofs_lhs->sect_off == ofs_rhs->sect_off
2473 && ofs_lhs->offset_in_dwz == ofs_rhs->offset_in_dwz);
2478 /* Read the given attribute value as an address, taking the attribute's
2479 form into account. */
2482 attr_value_as_address (struct attribute *attr)
2486 if (attr->form != DW_FORM_addr && attr->form != DW_FORM_GNU_addr_index)
2488 /* Aside from a few clearly defined exceptions, attributes that
2489 contain an address must always be in DW_FORM_addr form.
2490 Unfortunately, some compilers happen to be violating this
2491 requirement by encoding addresses using other forms, such
2492 as DW_FORM_data4 for example. For those broken compilers,
2493 we try to do our best, without any guarantee of success,
2494 to interpret the address correctly. It would also be nice
2495 to generate a complaint, but that would require us to maintain
2496 a list of legitimate cases where a non-address form is allowed,
2497 as well as update callers to pass in at least the CU's DWARF
2498 version. This is more overhead than what we're willing to
2499 expand for a pretty rare case. */
2500 addr = DW_UNSND (attr);
2503 addr = DW_ADDR (attr);
2508 /* The suffix for an index file. */
2509 #define INDEX4_SUFFIX ".gdb-index"
2510 #define INDEX5_SUFFIX ".debug_names"
2511 #define DEBUG_STR_SUFFIX ".debug_str"
2513 /* See declaration. */
2515 dwarf2_per_objfile::dwarf2_per_objfile (struct objfile *objfile_,
2516 const dwarf2_debug_sections *names)
2517 : objfile (objfile_)
2520 names = &dwarf2_elf_names;
2522 bfd *obfd = objfile->obfd;
2524 for (asection *sec = obfd->sections; sec != NULL; sec = sec->next)
2525 locate_sections (obfd, sec, *names);
2528 static void free_dwo_files (htab_t dwo_files, struct objfile *objfile);
2530 dwarf2_per_objfile::~dwarf2_per_objfile ()
2532 /* Cached DIE trees use xmalloc and the comp_unit_obstack. */
2533 free_cached_comp_units ();
2535 if (quick_file_names_table)
2536 htab_delete (quick_file_names_table);
2538 if (line_header_hash)
2539 htab_delete (line_header_hash);
2541 for (int ix = 0; ix < n_comp_units; ++ix)
2542 VEC_free (dwarf2_per_cu_ptr, all_comp_units[ix]->imported_symtabs);
2544 for (int ix = 0; ix < n_type_units; ++ix)
2545 VEC_free (dwarf2_per_cu_ptr,
2546 all_type_units[ix]->per_cu.imported_symtabs);
2547 xfree (all_type_units);
2549 VEC_free (dwarf2_section_info_def, types);
2551 if (dwo_files != NULL)
2552 free_dwo_files (dwo_files, objfile);
2553 if (dwp_file != NULL)
2554 gdb_bfd_unref (dwp_file->dbfd);
2556 if (dwz_file != NULL && dwz_file->dwz_bfd)
2557 gdb_bfd_unref (dwz_file->dwz_bfd);
2559 if (index_table != NULL)
2560 index_table->~mapped_index ();
2562 /* Everything else should be on the objfile obstack. */
2565 /* See declaration. */
2568 dwarf2_per_objfile::free_cached_comp_units ()
2570 dwarf2_per_cu_data *per_cu = read_in_chain;
2571 dwarf2_per_cu_data **last_chain = &read_in_chain;
2572 while (per_cu != NULL)
2574 dwarf2_per_cu_data *next_cu = per_cu->cu->read_in_chain;
2577 *last_chain = next_cu;
2582 /* Try to locate the sections we need for DWARF 2 debugging
2583 information and return true if we have enough to do something.
2584 NAMES points to the dwarf2 section names, or is NULL if the standard
2585 ELF names are used. */
2588 dwarf2_has_info (struct objfile *objfile,
2589 const struct dwarf2_debug_sections *names)
2591 if (objfile->flags & OBJF_READNEVER)
2594 struct dwarf2_per_objfile *dwarf2_per_objfile
2595 = get_dwarf2_per_objfile (objfile);
2597 if (dwarf2_per_objfile == NULL)
2599 /* Initialize per-objfile state. */
2601 = new (&objfile->objfile_obstack) struct dwarf2_per_objfile (objfile,
2603 set_dwarf2_per_objfile (objfile, dwarf2_per_objfile);
2605 return (!dwarf2_per_objfile->info.is_virtual
2606 && dwarf2_per_objfile->info.s.section != NULL
2607 && !dwarf2_per_objfile->abbrev.is_virtual
2608 && dwarf2_per_objfile->abbrev.s.section != NULL);
2611 /* Return the containing section of virtual section SECTION. */
2613 static struct dwarf2_section_info *
2614 get_containing_section (const struct dwarf2_section_info *section)
2616 gdb_assert (section->is_virtual);
2617 return section->s.containing_section;
2620 /* Return the bfd owner of SECTION. */
2623 get_section_bfd_owner (const struct dwarf2_section_info *section)
2625 if (section->is_virtual)
2627 section = get_containing_section (section);
2628 gdb_assert (!section->is_virtual);
2630 return section->s.section->owner;
2633 /* Return the bfd section of SECTION.
2634 Returns NULL if the section is not present. */
2637 get_section_bfd_section (const struct dwarf2_section_info *section)
2639 if (section->is_virtual)
2641 section = get_containing_section (section);
2642 gdb_assert (!section->is_virtual);
2644 return section->s.section;
2647 /* Return the name of SECTION. */
2650 get_section_name (const struct dwarf2_section_info *section)
2652 asection *sectp = get_section_bfd_section (section);
2654 gdb_assert (sectp != NULL);
2655 return bfd_section_name (get_section_bfd_owner (section), sectp);
2658 /* Return the name of the file SECTION is in. */
2661 get_section_file_name (const struct dwarf2_section_info *section)
2663 bfd *abfd = get_section_bfd_owner (section);
2665 return bfd_get_filename (abfd);
2668 /* Return the id of SECTION.
2669 Returns 0 if SECTION doesn't exist. */
2672 get_section_id (const struct dwarf2_section_info *section)
2674 asection *sectp = get_section_bfd_section (section);
2681 /* Return the flags of SECTION.
2682 SECTION (or containing section if this is a virtual section) must exist. */
2685 get_section_flags (const struct dwarf2_section_info *section)
2687 asection *sectp = get_section_bfd_section (section);
2689 gdb_assert (sectp != NULL);
2690 return bfd_get_section_flags (sectp->owner, sectp);
2693 /* When loading sections, we look either for uncompressed section or for
2694 compressed section names. */
2697 section_is_p (const char *section_name,
2698 const struct dwarf2_section_names *names)
2700 if (names->normal != NULL
2701 && strcmp (section_name, names->normal) == 0)
2703 if (names->compressed != NULL
2704 && strcmp (section_name, names->compressed) == 0)
2709 /* See declaration. */
2712 dwarf2_per_objfile::locate_sections (bfd *abfd, asection *sectp,
2713 const dwarf2_debug_sections &names)
2715 flagword aflag = bfd_get_section_flags (abfd, sectp);
2717 if ((aflag & SEC_HAS_CONTENTS) == 0)
2720 else if (section_is_p (sectp->name, &names.info))
2722 this->info.s.section = sectp;
2723 this->info.size = bfd_get_section_size (sectp);
2725 else if (section_is_p (sectp->name, &names.abbrev))
2727 this->abbrev.s.section = sectp;
2728 this->abbrev.size = bfd_get_section_size (sectp);
2730 else if (section_is_p (sectp->name, &names.line))
2732 this->line.s.section = sectp;
2733 this->line.size = bfd_get_section_size (sectp);
2735 else if (section_is_p (sectp->name, &names.loc))
2737 this->loc.s.section = sectp;
2738 this->loc.size = bfd_get_section_size (sectp);
2740 else if (section_is_p (sectp->name, &names.loclists))
2742 this->loclists.s.section = sectp;
2743 this->loclists.size = bfd_get_section_size (sectp);
2745 else if (section_is_p (sectp->name, &names.macinfo))
2747 this->macinfo.s.section = sectp;
2748 this->macinfo.size = bfd_get_section_size (sectp);
2750 else if (section_is_p (sectp->name, &names.macro))
2752 this->macro.s.section = sectp;
2753 this->macro.size = bfd_get_section_size (sectp);
2755 else if (section_is_p (sectp->name, &names.str))
2757 this->str.s.section = sectp;
2758 this->str.size = bfd_get_section_size (sectp);
2760 else if (section_is_p (sectp->name, &names.line_str))
2762 this->line_str.s.section = sectp;
2763 this->line_str.size = bfd_get_section_size (sectp);
2765 else if (section_is_p (sectp->name, &names.addr))
2767 this->addr.s.section = sectp;
2768 this->addr.size = bfd_get_section_size (sectp);
2770 else if (section_is_p (sectp->name, &names.frame))
2772 this->frame.s.section = sectp;
2773 this->frame.size = bfd_get_section_size (sectp);
2775 else if (section_is_p (sectp->name, &names.eh_frame))
2777 this->eh_frame.s.section = sectp;
2778 this->eh_frame.size = bfd_get_section_size (sectp);
2780 else if (section_is_p (sectp->name, &names.ranges))
2782 this->ranges.s.section = sectp;
2783 this->ranges.size = bfd_get_section_size (sectp);
2785 else if (section_is_p (sectp->name, &names.rnglists))
2787 this->rnglists.s.section = sectp;
2788 this->rnglists.size = bfd_get_section_size (sectp);
2790 else if (section_is_p (sectp->name, &names.types))
2792 struct dwarf2_section_info type_section;
2794 memset (&type_section, 0, sizeof (type_section));
2795 type_section.s.section = sectp;
2796 type_section.size = bfd_get_section_size (sectp);
2798 VEC_safe_push (dwarf2_section_info_def, this->types,
2801 else if (section_is_p (sectp->name, &names.gdb_index))
2803 this->gdb_index.s.section = sectp;
2804 this->gdb_index.size = bfd_get_section_size (sectp);
2806 else if (section_is_p (sectp->name, &names.debug_names))
2808 this->debug_names.s.section = sectp;
2809 this->debug_names.size = bfd_get_section_size (sectp);
2811 else if (section_is_p (sectp->name, &names.debug_aranges))
2813 this->debug_aranges.s.section = sectp;
2814 this->debug_aranges.size = bfd_get_section_size (sectp);
2817 if ((bfd_get_section_flags (abfd, sectp) & (SEC_LOAD | SEC_ALLOC))
2818 && bfd_section_vma (abfd, sectp) == 0)
2819 this->has_section_at_zero = true;
2822 /* A helper function that decides whether a section is empty,
2826 dwarf2_section_empty_p (const struct dwarf2_section_info *section)
2828 if (section->is_virtual)
2829 return section->size == 0;
2830 return section->s.section == NULL || section->size == 0;
2833 /* Read the contents of the section INFO.
2834 OBJFILE is the main object file, but not necessarily the file where
2835 the section comes from. E.g., for DWO files the bfd of INFO is the bfd
2837 If the section is compressed, uncompress it before returning. */
2840 dwarf2_read_section (struct objfile *objfile, struct dwarf2_section_info *info)
2844 gdb_byte *buf, *retbuf;
2848 info->buffer = NULL;
2851 if (dwarf2_section_empty_p (info))
2854 sectp = get_section_bfd_section (info);
2856 /* If this is a virtual section we need to read in the real one first. */
2857 if (info->is_virtual)
2859 struct dwarf2_section_info *containing_section =
2860 get_containing_section (info);
2862 gdb_assert (sectp != NULL);
2863 if ((sectp->flags & SEC_RELOC) != 0)
2865 error (_("Dwarf Error: DWP format V2 with relocations is not"
2866 " supported in section %s [in module %s]"),
2867 get_section_name (info), get_section_file_name (info));
2869 dwarf2_read_section (objfile, containing_section);
2870 /* Other code should have already caught virtual sections that don't
2872 gdb_assert (info->virtual_offset + info->size
2873 <= containing_section->size);
2874 /* If the real section is empty or there was a problem reading the
2875 section we shouldn't get here. */
2876 gdb_assert (containing_section->buffer != NULL);
2877 info->buffer = containing_section->buffer + info->virtual_offset;
2881 /* If the section has relocations, we must read it ourselves.
2882 Otherwise we attach it to the BFD. */
2883 if ((sectp->flags & SEC_RELOC) == 0)
2885 info->buffer = gdb_bfd_map_section (sectp, &info->size);
2889 buf = (gdb_byte *) obstack_alloc (&objfile->objfile_obstack, info->size);
2892 /* When debugging .o files, we may need to apply relocations; see
2893 http://sourceware.org/ml/gdb-patches/2002-04/msg00136.html .
2894 We never compress sections in .o files, so we only need to
2895 try this when the section is not compressed. */
2896 retbuf = symfile_relocate_debug_section (objfile, sectp, buf);
2899 info->buffer = retbuf;
2903 abfd = get_section_bfd_owner (info);
2904 gdb_assert (abfd != NULL);
2906 if (bfd_seek (abfd, sectp->filepos, SEEK_SET) != 0
2907 || bfd_bread (buf, info->size, abfd) != info->size)
2909 error (_("Dwarf Error: Can't read DWARF data"
2910 " in section %s [in module %s]"),
2911 bfd_section_name (abfd, sectp), bfd_get_filename (abfd));
2915 /* A helper function that returns the size of a section in a safe way.
2916 If you are positive that the section has been read before using the
2917 size, then it is safe to refer to the dwarf2_section_info object's
2918 "size" field directly. In other cases, you must call this
2919 function, because for compressed sections the size field is not set
2920 correctly until the section has been read. */
2922 static bfd_size_type
2923 dwarf2_section_size (struct objfile *objfile,
2924 struct dwarf2_section_info *info)
2927 dwarf2_read_section (objfile, info);
2931 /* Fill in SECTP, BUFP and SIZEP with section info, given OBJFILE and
2935 dwarf2_get_section_info (struct objfile *objfile,
2936 enum dwarf2_section_enum sect,
2937 asection **sectp, const gdb_byte **bufp,
2938 bfd_size_type *sizep)
2940 struct dwarf2_per_objfile *data
2941 = (struct dwarf2_per_objfile *) objfile_data (objfile,
2942 dwarf2_objfile_data_key);
2943 struct dwarf2_section_info *info;
2945 /* We may see an objfile without any DWARF, in which case we just
2956 case DWARF2_DEBUG_FRAME:
2957 info = &data->frame;
2959 case DWARF2_EH_FRAME:
2960 info = &data->eh_frame;
2963 gdb_assert_not_reached ("unexpected section");
2966 dwarf2_read_section (objfile, info);
2968 *sectp = get_section_bfd_section (info);
2969 *bufp = info->buffer;
2970 *sizep = info->size;
2973 /* A helper function to find the sections for a .dwz file. */
2976 locate_dwz_sections (bfd *abfd, asection *sectp, void *arg)
2978 struct dwz_file *dwz_file = (struct dwz_file *) arg;
2980 /* Note that we only support the standard ELF names, because .dwz
2981 is ELF-only (at the time of writing). */
2982 if (section_is_p (sectp->name, &dwarf2_elf_names.abbrev))
2984 dwz_file->abbrev.s.section = sectp;
2985 dwz_file->abbrev.size = bfd_get_section_size (sectp);
2987 else if (section_is_p (sectp->name, &dwarf2_elf_names.info))
2989 dwz_file->info.s.section = sectp;
2990 dwz_file->info.size = bfd_get_section_size (sectp);
2992 else if (section_is_p (sectp->name, &dwarf2_elf_names.str))
2994 dwz_file->str.s.section = sectp;
2995 dwz_file->str.size = bfd_get_section_size (sectp);
2997 else if (section_is_p (sectp->name, &dwarf2_elf_names.line))
2999 dwz_file->line.s.section = sectp;
3000 dwz_file->line.size = bfd_get_section_size (sectp);
3002 else if (section_is_p (sectp->name, &dwarf2_elf_names.macro))
3004 dwz_file->macro.s.section = sectp;
3005 dwz_file->macro.size = bfd_get_section_size (sectp);
3007 else if (section_is_p (sectp->name, &dwarf2_elf_names.gdb_index))
3009 dwz_file->gdb_index.s.section = sectp;
3010 dwz_file->gdb_index.size = bfd_get_section_size (sectp);
3012 else if (section_is_p (sectp->name, &dwarf2_elf_names.debug_names))
3014 dwz_file->debug_names.s.section = sectp;
3015 dwz_file->debug_names.size = bfd_get_section_size (sectp);
3019 /* Open the separate '.dwz' debug file, if needed. Return NULL if
3020 there is no .gnu_debugaltlink section in the file. Error if there
3021 is such a section but the file cannot be found. */
3023 static struct dwz_file *
3024 dwarf2_get_dwz_file (struct dwarf2_per_objfile *dwarf2_per_objfile)
3026 const char *filename;
3027 struct dwz_file *result;
3028 bfd_size_type buildid_len_arg;
3032 if (dwarf2_per_objfile->dwz_file != NULL)
3033 return dwarf2_per_objfile->dwz_file;
3035 bfd_set_error (bfd_error_no_error);
3036 gdb::unique_xmalloc_ptr<char> data
3037 (bfd_get_alt_debug_link_info (dwarf2_per_objfile->objfile->obfd,
3038 &buildid_len_arg, &buildid));
3041 if (bfd_get_error () == bfd_error_no_error)
3043 error (_("could not read '.gnu_debugaltlink' section: %s"),
3044 bfd_errmsg (bfd_get_error ()));
3047 gdb::unique_xmalloc_ptr<bfd_byte> buildid_holder (buildid);
3049 buildid_len = (size_t) buildid_len_arg;
3051 filename = data.get ();
3053 std::string abs_storage;
3054 if (!IS_ABSOLUTE_PATH (filename))
3056 gdb::unique_xmalloc_ptr<char> abs
3057 = gdb_realpath (objfile_name (dwarf2_per_objfile->objfile));
3059 abs_storage = ldirname (abs.get ()) + SLASH_STRING + filename;
3060 filename = abs_storage.c_str ();
3063 /* First try the file name given in the section. If that doesn't
3064 work, try to use the build-id instead. */
3065 gdb_bfd_ref_ptr dwz_bfd (gdb_bfd_open (filename, gnutarget, -1));
3066 if (dwz_bfd != NULL)
3068 if (!build_id_verify (dwz_bfd.get (), buildid_len, buildid))
3072 if (dwz_bfd == NULL)
3073 dwz_bfd = build_id_to_debug_bfd (buildid_len, buildid);
3075 if (dwz_bfd == NULL)
3076 error (_("could not find '.gnu_debugaltlink' file for %s"),
3077 objfile_name (dwarf2_per_objfile->objfile));
3079 result = OBSTACK_ZALLOC (&dwarf2_per_objfile->objfile->objfile_obstack,
3081 result->dwz_bfd = dwz_bfd.release ();
3083 bfd_map_over_sections (result->dwz_bfd, locate_dwz_sections, result);
3085 gdb_bfd_record_inclusion (dwarf2_per_objfile->objfile->obfd, result->dwz_bfd);
3086 dwarf2_per_objfile->dwz_file = result;
3090 /* DWARF quick_symbols_functions support. */
3092 /* TUs can share .debug_line entries, and there can be a lot more TUs than
3093 unique line tables, so we maintain a separate table of all .debug_line
3094 derived entries to support the sharing.
3095 All the quick functions need is the list of file names. We discard the
3096 line_header when we're done and don't need to record it here. */
3097 struct quick_file_names
3099 /* The data used to construct the hash key. */
3100 struct stmt_list_hash hash;
3102 /* The number of entries in file_names, real_names. */
3103 unsigned int num_file_names;
3105 /* The file names from the line table, after being run through
3107 const char **file_names;
3109 /* The file names from the line table after being run through
3110 gdb_realpath. These are computed lazily. */
3111 const char **real_names;
3114 /* When using the index (and thus not using psymtabs), each CU has an
3115 object of this type. This is used to hold information needed by
3116 the various "quick" methods. */
3117 struct dwarf2_per_cu_quick_data
3119 /* The file table. This can be NULL if there was no file table
3120 or it's currently not read in.
3121 NOTE: This points into dwarf2_per_objfile->quick_file_names_table. */
3122 struct quick_file_names *file_names;
3124 /* The corresponding symbol table. This is NULL if symbols for this
3125 CU have not yet been read. */
3126 struct compunit_symtab *compunit_symtab;
3128 /* A temporary mark bit used when iterating over all CUs in
3129 expand_symtabs_matching. */
3130 unsigned int mark : 1;
3132 /* True if we've tried to read the file table and found there isn't one.
3133 There will be no point in trying to read it again next time. */
3134 unsigned int no_file_data : 1;
3137 /* Utility hash function for a stmt_list_hash. */
3140 hash_stmt_list_entry (const struct stmt_list_hash *stmt_list_hash)
3144 if (stmt_list_hash->dwo_unit != NULL)
3145 v += (uintptr_t) stmt_list_hash->dwo_unit->dwo_file;
3146 v += to_underlying (stmt_list_hash->line_sect_off);
3150 /* Utility equality function for a stmt_list_hash. */
3153 eq_stmt_list_entry (const struct stmt_list_hash *lhs,
3154 const struct stmt_list_hash *rhs)
3156 if ((lhs->dwo_unit != NULL) != (rhs->dwo_unit != NULL))
3158 if (lhs->dwo_unit != NULL
3159 && lhs->dwo_unit->dwo_file != rhs->dwo_unit->dwo_file)
3162 return lhs->line_sect_off == rhs->line_sect_off;
3165 /* Hash function for a quick_file_names. */
3168 hash_file_name_entry (const void *e)
3170 const struct quick_file_names *file_data
3171 = (const struct quick_file_names *) e;
3173 return hash_stmt_list_entry (&file_data->hash);
3176 /* Equality function for a quick_file_names. */
3179 eq_file_name_entry (const void *a, const void *b)
3181 const struct quick_file_names *ea = (const struct quick_file_names *) a;
3182 const struct quick_file_names *eb = (const struct quick_file_names *) b;
3184 return eq_stmt_list_entry (&ea->hash, &eb->hash);
3187 /* Delete function for a quick_file_names. */
3190 delete_file_name_entry (void *e)
3192 struct quick_file_names *file_data = (struct quick_file_names *) e;
3195 for (i = 0; i < file_data->num_file_names; ++i)
3197 xfree ((void*) file_data->file_names[i]);
3198 if (file_data->real_names)
3199 xfree ((void*) file_data->real_names[i]);
3202 /* The space for the struct itself lives on objfile_obstack,
3203 so we don't free it here. */
3206 /* Create a quick_file_names hash table. */
3209 create_quick_file_names_table (unsigned int nr_initial_entries)
3211 return htab_create_alloc (nr_initial_entries,
3212 hash_file_name_entry, eq_file_name_entry,
3213 delete_file_name_entry, xcalloc, xfree);
3216 /* Read in PER_CU->CU. This function is unrelated to symtabs, symtab would
3217 have to be created afterwards. You should call age_cached_comp_units after
3218 processing PER_CU->CU. dw2_setup must have been already called. */
3221 load_cu (struct dwarf2_per_cu_data *per_cu)
3223 if (per_cu->is_debug_types)
3224 load_full_type_unit (per_cu);
3226 load_full_comp_unit (per_cu, language_minimal);
3228 if (per_cu->cu == NULL)
3229 return; /* Dummy CU. */
3231 dwarf2_find_base_address (per_cu->cu->dies, per_cu->cu);
3234 /* Read in the symbols for PER_CU. */
3237 dw2_do_instantiate_symtab (struct dwarf2_per_cu_data *per_cu)
3239 struct dwarf2_per_objfile *dwarf2_per_objfile = per_cu->dwarf2_per_objfile;
3241 /* Skip type_unit_groups, reading the type units they contain
3242 is handled elsewhere. */
3243 if (IS_TYPE_UNIT_GROUP (per_cu))
3246 /* The destructor of dwarf2_queue_guard frees any entries left on
3247 the queue. After this point we're guaranteed to leave this function
3248 with the dwarf queue empty. */
3249 dwarf2_queue_guard q_guard;
3251 if (dwarf2_per_objfile->using_index
3252 ? per_cu->v.quick->compunit_symtab == NULL
3253 : (per_cu->v.psymtab == NULL || !per_cu->v.psymtab->readin))
3255 queue_comp_unit (per_cu, language_minimal);
3258 /* If we just loaded a CU from a DWO, and we're working with an index
3259 that may badly handle TUs, load all the TUs in that DWO as well.
3260 http://sourceware.org/bugzilla/show_bug.cgi?id=15021 */
3261 if (!per_cu->is_debug_types
3262 && per_cu->cu != NULL
3263 && per_cu->cu->dwo_unit != NULL
3264 && dwarf2_per_objfile->index_table != NULL
3265 && dwarf2_per_objfile->index_table->version <= 7
3266 /* DWP files aren't supported yet. */
3267 && get_dwp_file (dwarf2_per_objfile) == NULL)
3268 queue_and_load_all_dwo_tus (per_cu);
3271 process_queue (dwarf2_per_objfile);
3273 /* Age the cache, releasing compilation units that have not
3274 been used recently. */
3275 age_cached_comp_units (dwarf2_per_objfile);
3278 /* Ensure that the symbols for PER_CU have been read in. OBJFILE is
3279 the objfile from which this CU came. Returns the resulting symbol
3282 static struct compunit_symtab *
3283 dw2_instantiate_symtab (struct dwarf2_per_cu_data *per_cu)
3285 struct dwarf2_per_objfile *dwarf2_per_objfile = per_cu->dwarf2_per_objfile;
3287 gdb_assert (dwarf2_per_objfile->using_index);
3288 if (!per_cu->v.quick->compunit_symtab)
3290 struct cleanup *back_to = make_cleanup (free_cached_comp_units,
3291 dwarf2_per_objfile);
3292 scoped_restore decrementer = increment_reading_symtab ();
3293 dw2_do_instantiate_symtab (per_cu);
3294 process_cu_includes (dwarf2_per_objfile);
3295 do_cleanups (back_to);
3298 return per_cu->v.quick->compunit_symtab;
3301 /* Return the CU/TU given its index.
3303 This is intended for loops like:
3305 for (i = 0; i < (dwarf2_per_objfile->n_comp_units
3306 + dwarf2_per_objfile->n_type_units); ++i)
3308 struct dwarf2_per_cu_data *per_cu = dw2_get_cutu (i);
3314 static struct dwarf2_per_cu_data *
3315 dw2_get_cutu (struct dwarf2_per_objfile *dwarf2_per_objfile,
3318 if (index >= dwarf2_per_objfile->n_comp_units)
3320 index -= dwarf2_per_objfile->n_comp_units;
3321 gdb_assert (index < dwarf2_per_objfile->n_type_units);
3322 return &dwarf2_per_objfile->all_type_units[index]->per_cu;
3325 return dwarf2_per_objfile->all_comp_units[index];
3328 /* Return the CU given its index.
3329 This differs from dw2_get_cutu in that it's for when you know INDEX
3332 static struct dwarf2_per_cu_data *
3333 dw2_get_cu (struct dwarf2_per_objfile *dwarf2_per_objfile, int index)
3335 gdb_assert (index >= 0 && index < dwarf2_per_objfile->n_comp_units);
3337 return dwarf2_per_objfile->all_comp_units[index];
3340 /* Return a new dwarf2_per_cu_data allocated on OBJFILE's
3341 objfile_obstack, and constructed with the specified field
3344 static dwarf2_per_cu_data *
3345 create_cu_from_index_list (struct dwarf2_per_objfile *dwarf2_per_objfile,
3346 struct dwarf2_section_info *section,
3348 sect_offset sect_off, ULONGEST length)
3350 struct objfile *objfile = dwarf2_per_objfile->objfile;
3351 dwarf2_per_cu_data *the_cu
3352 = OBSTACK_ZALLOC (&objfile->objfile_obstack,
3353 struct dwarf2_per_cu_data);
3354 the_cu->sect_off = sect_off;
3355 the_cu->length = length;
3356 the_cu->dwarf2_per_objfile = dwarf2_per_objfile;
3357 the_cu->section = section;
3358 the_cu->v.quick = OBSTACK_ZALLOC (&objfile->objfile_obstack,
3359 struct dwarf2_per_cu_quick_data);
3360 the_cu->is_dwz = is_dwz;
3364 /* A helper for create_cus_from_index that handles a given list of
3368 create_cus_from_index_list (struct objfile *objfile,
3369 const gdb_byte *cu_list, offset_type n_elements,
3370 struct dwarf2_section_info *section,
3375 struct dwarf2_per_objfile *dwarf2_per_objfile
3376 = get_dwarf2_per_objfile (objfile);
3378 for (i = 0; i < n_elements; i += 2)
3380 gdb_static_assert (sizeof (ULONGEST) >= 8);
3382 sect_offset sect_off
3383 = (sect_offset) extract_unsigned_integer (cu_list, 8, BFD_ENDIAN_LITTLE);
3384 ULONGEST length = extract_unsigned_integer (cu_list + 8, 8, BFD_ENDIAN_LITTLE);
3387 dwarf2_per_objfile->all_comp_units[base_offset + i / 2]
3388 = create_cu_from_index_list (dwarf2_per_objfile, section, is_dwz,
3393 /* Read the CU list from the mapped index, and use it to create all
3394 the CU objects for this objfile. */
3397 create_cus_from_index (struct objfile *objfile,
3398 const gdb_byte *cu_list, offset_type cu_list_elements,
3399 const gdb_byte *dwz_list, offset_type dwz_elements)
3401 struct dwz_file *dwz;
3402 struct dwarf2_per_objfile *dwarf2_per_objfile
3403 = get_dwarf2_per_objfile (objfile);
3405 dwarf2_per_objfile->n_comp_units = (cu_list_elements + dwz_elements) / 2;
3406 dwarf2_per_objfile->all_comp_units =
3407 XOBNEWVEC (&objfile->objfile_obstack, struct dwarf2_per_cu_data *,
3408 dwarf2_per_objfile->n_comp_units);
3410 create_cus_from_index_list (objfile, cu_list, cu_list_elements,
3411 &dwarf2_per_objfile->info, 0, 0);
3413 if (dwz_elements == 0)
3416 dwz = dwarf2_get_dwz_file (dwarf2_per_objfile);
3417 create_cus_from_index_list (objfile, dwz_list, dwz_elements, &dwz->info, 1,
3418 cu_list_elements / 2);
3421 /* Create the signatured type hash table from the index. */
3424 create_signatured_type_table_from_index (struct objfile *objfile,
3425 struct dwarf2_section_info *section,
3426 const gdb_byte *bytes,
3427 offset_type elements)
3430 htab_t sig_types_hash;
3431 struct dwarf2_per_objfile *dwarf2_per_objfile
3432 = get_dwarf2_per_objfile (objfile);
3434 dwarf2_per_objfile->n_type_units
3435 = dwarf2_per_objfile->n_allocated_type_units
3437 dwarf2_per_objfile->all_type_units =
3438 XNEWVEC (struct signatured_type *, dwarf2_per_objfile->n_type_units);
3440 sig_types_hash = allocate_signatured_type_table (objfile);
3442 for (i = 0; i < elements; i += 3)
3444 struct signatured_type *sig_type;
3447 cu_offset type_offset_in_tu;
3449 gdb_static_assert (sizeof (ULONGEST) >= 8);
3450 sect_offset sect_off
3451 = (sect_offset) extract_unsigned_integer (bytes, 8, BFD_ENDIAN_LITTLE);
3453 = (cu_offset) extract_unsigned_integer (bytes + 8, 8,
3455 signature = extract_unsigned_integer (bytes + 16, 8, BFD_ENDIAN_LITTLE);
3458 sig_type = OBSTACK_ZALLOC (&objfile->objfile_obstack,
3459 struct signatured_type);
3460 sig_type->signature = signature;
3461 sig_type->type_offset_in_tu = type_offset_in_tu;
3462 sig_type->per_cu.is_debug_types = 1;
3463 sig_type->per_cu.section = section;
3464 sig_type->per_cu.sect_off = sect_off;
3465 sig_type->per_cu.dwarf2_per_objfile = dwarf2_per_objfile;
3466 sig_type->per_cu.v.quick
3467 = OBSTACK_ZALLOC (&objfile->objfile_obstack,
3468 struct dwarf2_per_cu_quick_data);
3470 slot = htab_find_slot (sig_types_hash, sig_type, INSERT);
3473 dwarf2_per_objfile->all_type_units[i / 3] = sig_type;
3476 dwarf2_per_objfile->signatured_types = sig_types_hash;
3479 /* Create the signatured type hash table from .debug_names. */
3482 create_signatured_type_table_from_debug_names
3483 (struct dwarf2_per_objfile *dwarf2_per_objfile,
3484 const mapped_debug_names &map,
3485 struct dwarf2_section_info *section,
3486 struct dwarf2_section_info *abbrev_section)
3488 struct objfile *objfile = dwarf2_per_objfile->objfile;
3490 dwarf2_read_section (objfile, section);
3491 dwarf2_read_section (objfile, abbrev_section);
3493 dwarf2_per_objfile->n_type_units
3494 = dwarf2_per_objfile->n_allocated_type_units
3496 dwarf2_per_objfile->all_type_units
3497 = XNEWVEC (struct signatured_type *, dwarf2_per_objfile->n_type_units);
3499 htab_t sig_types_hash = allocate_signatured_type_table (objfile);
3501 for (uint32_t i = 0; i < map.tu_count; ++i)
3503 struct signatured_type *sig_type;
3506 cu_offset type_offset_in_tu;
3508 sect_offset sect_off
3509 = (sect_offset) (extract_unsigned_integer
3510 (map.tu_table_reordered + i * map.offset_size,
3512 map.dwarf5_byte_order));
3514 comp_unit_head cu_header;
3515 read_and_check_comp_unit_head (dwarf2_per_objfile, &cu_header, section,
3517 section->buffer + to_underlying (sect_off),
3520 sig_type = OBSTACK_ZALLOC (&objfile->objfile_obstack,
3521 struct signatured_type);
3522 sig_type->signature = cu_header.signature;
3523 sig_type->type_offset_in_tu = cu_header.type_cu_offset_in_tu;
3524 sig_type->per_cu.is_debug_types = 1;
3525 sig_type->per_cu.section = section;
3526 sig_type->per_cu.sect_off = sect_off;
3527 sig_type->per_cu.dwarf2_per_objfile = dwarf2_per_objfile;
3528 sig_type->per_cu.v.quick
3529 = OBSTACK_ZALLOC (&objfile->objfile_obstack,
3530 struct dwarf2_per_cu_quick_data);
3532 slot = htab_find_slot (sig_types_hash, sig_type, INSERT);
3535 dwarf2_per_objfile->all_type_units[i] = sig_type;
3538 dwarf2_per_objfile->signatured_types = sig_types_hash;
3541 /* Read the address map data from the mapped index, and use it to
3542 populate the objfile's psymtabs_addrmap. */
3545 create_addrmap_from_index (struct dwarf2_per_objfile *dwarf2_per_objfile,
3546 struct mapped_index *index)
3548 struct objfile *objfile = dwarf2_per_objfile->objfile;
3549 struct gdbarch *gdbarch = get_objfile_arch (objfile);
3550 const gdb_byte *iter, *end;
3551 struct addrmap *mutable_map;
3554 auto_obstack temp_obstack;
3556 mutable_map = addrmap_create_mutable (&temp_obstack);
3558 iter = index->address_table.data ();
3559 end = iter + index->address_table.size ();
3561 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
3565 ULONGEST hi, lo, cu_index;
3566 lo = extract_unsigned_integer (iter, 8, BFD_ENDIAN_LITTLE);
3568 hi = extract_unsigned_integer (iter, 8, BFD_ENDIAN_LITTLE);
3570 cu_index = extract_unsigned_integer (iter, 4, BFD_ENDIAN_LITTLE);
3575 complaint (&symfile_complaints,
3576 _(".gdb_index address table has invalid range (%s - %s)"),
3577 hex_string (lo), hex_string (hi));
3581 if (cu_index >= dwarf2_per_objfile->n_comp_units)
3583 complaint (&symfile_complaints,
3584 _(".gdb_index address table has invalid CU number %u"),
3585 (unsigned) cu_index);
3589 lo = gdbarch_adjust_dwarf2_addr (gdbarch, lo + baseaddr);
3590 hi = gdbarch_adjust_dwarf2_addr (gdbarch, hi + baseaddr);
3591 addrmap_set_empty (mutable_map, lo, hi - 1,
3592 dw2_get_cutu (dwarf2_per_objfile, cu_index));
3595 objfile->psymtabs_addrmap = addrmap_create_fixed (mutable_map,
3596 &objfile->objfile_obstack);
3599 /* Read the address map data from DWARF-5 .debug_aranges, and use it to
3600 populate the objfile's psymtabs_addrmap. */
3603 create_addrmap_from_aranges (struct dwarf2_per_objfile *dwarf2_per_objfile,
3604 struct dwarf2_section_info *section)
3606 struct objfile *objfile = dwarf2_per_objfile->objfile;
3607 bfd *abfd = objfile->obfd;
3608 struct gdbarch *gdbarch = get_objfile_arch (objfile);
3609 const CORE_ADDR baseaddr = ANOFFSET (objfile->section_offsets,
3610 SECT_OFF_TEXT (objfile));
3612 auto_obstack temp_obstack;
3613 addrmap *mutable_map = addrmap_create_mutable (&temp_obstack);
3615 std::unordered_map<sect_offset,
3616 dwarf2_per_cu_data *,
3617 gdb::hash_enum<sect_offset>>
3618 debug_info_offset_to_per_cu;
3619 for (int cui = 0; cui < dwarf2_per_objfile->n_comp_units; ++cui)
3621 dwarf2_per_cu_data *per_cu = dw2_get_cutu (dwarf2_per_objfile, cui);
3622 const auto insertpair
3623 = debug_info_offset_to_per_cu.emplace (per_cu->sect_off, per_cu);
3624 if (!insertpair.second)
3626 warning (_("Section .debug_aranges in %s has duplicate "
3627 "debug_info_offset %s, ignoring .debug_aranges."),
3628 objfile_name (objfile), sect_offset_str (per_cu->sect_off));
3633 dwarf2_read_section (objfile, section);
3635 const bfd_endian dwarf5_byte_order = gdbarch_byte_order (gdbarch);
3637 const gdb_byte *addr = section->buffer;
3639 while (addr < section->buffer + section->size)
3641 const gdb_byte *const entry_addr = addr;
3642 unsigned int bytes_read;
3644 const LONGEST entry_length = read_initial_length (abfd, addr,
3648 const gdb_byte *const entry_end = addr + entry_length;
3649 const bool dwarf5_is_dwarf64 = bytes_read != 4;
3650 const uint8_t offset_size = dwarf5_is_dwarf64 ? 8 : 4;
3651 if (addr + entry_length > section->buffer + section->size)
3653 warning (_("Section .debug_aranges in %s entry at offset %zu "
3654 "length %s exceeds section length %s, "
3655 "ignoring .debug_aranges."),
3656 objfile_name (objfile), entry_addr - section->buffer,
3657 plongest (bytes_read + entry_length),
3658 pulongest (section->size));
3662 /* The version number. */
3663 const uint16_t version = read_2_bytes (abfd, addr);
3667 warning (_("Section .debug_aranges in %s entry at offset %zu "
3668 "has unsupported version %d, ignoring .debug_aranges."),
3669 objfile_name (objfile), entry_addr - section->buffer,
3674 const uint64_t debug_info_offset
3675 = extract_unsigned_integer (addr, offset_size, dwarf5_byte_order);
3676 addr += offset_size;
3677 const auto per_cu_it
3678 = debug_info_offset_to_per_cu.find (sect_offset (debug_info_offset));
3679 if (per_cu_it == debug_info_offset_to_per_cu.cend ())
3681 warning (_("Section .debug_aranges in %s entry at offset %zu "
3682 "debug_info_offset %s does not exists, "
3683 "ignoring .debug_aranges."),
3684 objfile_name (objfile), entry_addr - section->buffer,
3685 pulongest (debug_info_offset));
3688 dwarf2_per_cu_data *const per_cu = per_cu_it->second;
3690 const uint8_t address_size = *addr++;
3691 if (address_size < 1 || address_size > 8)
3693 warning (_("Section .debug_aranges in %s entry at offset %zu "
3694 "address_size %u is invalid, ignoring .debug_aranges."),
3695 objfile_name (objfile), entry_addr - section->buffer,
3700 const uint8_t segment_selector_size = *addr++;
3701 if (segment_selector_size != 0)
3703 warning (_("Section .debug_aranges in %s entry at offset %zu "
3704 "segment_selector_size %u is not supported, "
3705 "ignoring .debug_aranges."),
3706 objfile_name (objfile), entry_addr - section->buffer,
3707 segment_selector_size);
3711 /* Must pad to an alignment boundary that is twice the address
3712 size. It is undocumented by the DWARF standard but GCC does
3714 for (size_t padding = ((-(addr - section->buffer))
3715 & (2 * address_size - 1));
3716 padding > 0; padding--)
3719 warning (_("Section .debug_aranges in %s entry at offset %zu "
3720 "padding is not zero, ignoring .debug_aranges."),
3721 objfile_name (objfile), entry_addr - section->buffer);
3727 if (addr + 2 * address_size > entry_end)
3729 warning (_("Section .debug_aranges in %s entry at offset %zu "
3730 "address list is not properly terminated, "
3731 "ignoring .debug_aranges."),
3732 objfile_name (objfile), entry_addr - section->buffer);
3735 ULONGEST start = extract_unsigned_integer (addr, address_size,
3737 addr += address_size;
3738 ULONGEST length = extract_unsigned_integer (addr, address_size,
3740 addr += address_size;
3741 if (start == 0 && length == 0)
3743 if (start == 0 && !dwarf2_per_objfile->has_section_at_zero)
3745 /* Symbol was eliminated due to a COMDAT group. */
3748 ULONGEST end = start + length;
3749 start = gdbarch_adjust_dwarf2_addr (gdbarch, start + baseaddr);
3750 end = gdbarch_adjust_dwarf2_addr (gdbarch, end + baseaddr);
3751 addrmap_set_empty (mutable_map, start, end - 1, per_cu);
3755 objfile->psymtabs_addrmap = addrmap_create_fixed (mutable_map,
3756 &objfile->objfile_obstack);
3759 /* The hash function for strings in the mapped index. This is the same as
3760 SYMBOL_HASH_NEXT, but we keep a separate copy to maintain control over the
3761 implementation. This is necessary because the hash function is tied to the
3762 format of the mapped index file. The hash values do not have to match with
3765 Use INT_MAX for INDEX_VERSION if you generate the current index format. */
3768 mapped_index_string_hash (int index_version, const void *p)
3770 const unsigned char *str = (const unsigned char *) p;
3774 while ((c = *str++) != 0)
3776 if (index_version >= 5)
3778 r = r * 67 + c - 113;
3784 /* Find a slot in the mapped index INDEX for the object named NAME.
3785 If NAME is found, set *VEC_OUT to point to the CU vector in the
3786 constant pool and return true. If NAME cannot be found, return
3790 find_slot_in_mapped_hash (struct mapped_index *index, const char *name,
3791 offset_type **vec_out)
3794 offset_type slot, step;
3795 int (*cmp) (const char *, const char *);
3797 gdb::unique_xmalloc_ptr<char> without_params;
3798 if (current_language->la_language == language_cplus
3799 || current_language->la_language == language_fortran
3800 || current_language->la_language == language_d)
3802 /* NAME is already canonical. Drop any qualifiers as .gdb_index does
3805 if (strchr (name, '(') != NULL)
3807 without_params = cp_remove_params (name);
3809 if (without_params != NULL)
3810 name = without_params.get ();
3814 /* Index version 4 did not support case insensitive searches. But the
3815 indices for case insensitive languages are built in lowercase, therefore
3816 simulate our NAME being searched is also lowercased. */
3817 hash = mapped_index_string_hash ((index->version == 4
3818 && case_sensitivity == case_sensitive_off
3819 ? 5 : index->version),
3822 slot = hash & (index->symbol_table.size () - 1);
3823 step = ((hash * 17) & (index->symbol_table.size () - 1)) | 1;
3824 cmp = (case_sensitivity == case_sensitive_on ? strcmp : strcasecmp);
3830 const auto &bucket = index->symbol_table[slot];
3831 if (bucket.name == 0 && bucket.vec == 0)
3834 str = index->constant_pool + MAYBE_SWAP (bucket.name);
3835 if (!cmp (name, str))
3837 *vec_out = (offset_type *) (index->constant_pool
3838 + MAYBE_SWAP (bucket.vec));
3842 slot = (slot + step) & (index->symbol_table.size () - 1);
3846 /* A helper function that reads the .gdb_index from SECTION and fills
3847 in MAP. FILENAME is the name of the file containing the section;
3848 it is used for error reporting. DEPRECATED_OK is nonzero if it is
3849 ok to use deprecated sections.
3851 CU_LIST, CU_LIST_ELEMENTS, TYPES_LIST, and TYPES_LIST_ELEMENTS are
3852 out parameters that are filled in with information about the CU and
3853 TU lists in the section.
3855 Returns 1 if all went well, 0 otherwise. */
3858 read_index_from_section (struct objfile *objfile,
3859 const char *filename,
3861 struct dwarf2_section_info *section,
3862 struct mapped_index *map,
3863 const gdb_byte **cu_list,
3864 offset_type *cu_list_elements,
3865 const gdb_byte **types_list,
3866 offset_type *types_list_elements)
3868 const gdb_byte *addr;
3869 offset_type version;
3870 offset_type *metadata;
3873 if (dwarf2_section_empty_p (section))
3876 /* Older elfutils strip versions could keep the section in the main
3877 executable while splitting it for the separate debug info file. */
3878 if ((get_section_flags (section) & SEC_HAS_CONTENTS) == 0)
3881 dwarf2_read_section (objfile, section);
3883 addr = section->buffer;
3884 /* Version check. */
3885 version = MAYBE_SWAP (*(offset_type *) addr);
3886 /* Versions earlier than 3 emitted every copy of a psymbol. This
3887 causes the index to behave very poorly for certain requests. Version 3
3888 contained incomplete addrmap. So, it seems better to just ignore such
3892 static int warning_printed = 0;
3893 if (!warning_printed)
3895 warning (_("Skipping obsolete .gdb_index section in %s."),
3897 warning_printed = 1;
3901 /* Index version 4 uses a different hash function than index version
3904 Versions earlier than 6 did not emit psymbols for inlined
3905 functions. Using these files will cause GDB not to be able to
3906 set breakpoints on inlined functions by name, so we ignore these
3907 indices unless the user has done
3908 "set use-deprecated-index-sections on". */
3909 if (version < 6 && !deprecated_ok)
3911 static int warning_printed = 0;
3912 if (!warning_printed)
3915 Skipping deprecated .gdb_index section in %s.\n\
3916 Do \"set use-deprecated-index-sections on\" before the file is read\n\
3917 to use the section anyway."),
3919 warning_printed = 1;
3923 /* Version 7 indices generated by gold refer to the CU for a symbol instead
3924 of the TU (for symbols coming from TUs),
3925 http://sourceware.org/bugzilla/show_bug.cgi?id=15021.
3926 Plus gold-generated indices can have duplicate entries for global symbols,
3927 http://sourceware.org/bugzilla/show_bug.cgi?id=15646.
3928 These are just performance bugs, and we can't distinguish gdb-generated
3929 indices from gold-generated ones, so issue no warning here. */
3931 /* Indexes with higher version than the one supported by GDB may be no
3932 longer backward compatible. */
3936 map->version = version;
3937 map->total_size = section->size;
3939 metadata = (offset_type *) (addr + sizeof (offset_type));
3942 *cu_list = addr + MAYBE_SWAP (metadata[i]);
3943 *cu_list_elements = ((MAYBE_SWAP (metadata[i + 1]) - MAYBE_SWAP (metadata[i]))
3947 *types_list = addr + MAYBE_SWAP (metadata[i]);
3948 *types_list_elements = ((MAYBE_SWAP (metadata[i + 1])
3949 - MAYBE_SWAP (metadata[i]))
3953 const gdb_byte *address_table = addr + MAYBE_SWAP (metadata[i]);
3954 const gdb_byte *address_table_end = addr + MAYBE_SWAP (metadata[i + 1]);
3956 = gdb::array_view<const gdb_byte> (address_table, address_table_end);
3959 const gdb_byte *symbol_table = addr + MAYBE_SWAP (metadata[i]);
3960 const gdb_byte *symbol_table_end = addr + MAYBE_SWAP (metadata[i + 1]);
3962 = gdb::array_view<mapped_index::symbol_table_slot>
3963 ((mapped_index::symbol_table_slot *) symbol_table,
3964 (mapped_index::symbol_table_slot *) symbol_table_end);
3967 map->constant_pool = (char *) (addr + MAYBE_SWAP (metadata[i]));
3972 /* Read .gdb_index. If everything went ok, initialize the "quick"
3973 elements of all the CUs and return 1. Otherwise, return 0. */
3976 dwarf2_read_index (struct objfile *objfile)
3978 struct mapped_index local_map, *map;
3979 const gdb_byte *cu_list, *types_list, *dwz_list = NULL;
3980 offset_type cu_list_elements, types_list_elements, dwz_list_elements = 0;
3981 struct dwz_file *dwz;
3982 struct dwarf2_per_objfile *dwarf2_per_objfile
3983 = get_dwarf2_per_objfile (objfile);
3985 if (!read_index_from_section (objfile, objfile_name (objfile),
3986 use_deprecated_index_sections,
3987 &dwarf2_per_objfile->gdb_index, &local_map,
3988 &cu_list, &cu_list_elements,
3989 &types_list, &types_list_elements))
3992 /* Don't use the index if it's empty. */
3993 if (local_map.symbol_table.empty ())
3996 /* If there is a .dwz file, read it so we can get its CU list as
3998 dwz = dwarf2_get_dwz_file (dwarf2_per_objfile);
4001 struct mapped_index dwz_map;
4002 const gdb_byte *dwz_types_ignore;
4003 offset_type dwz_types_elements_ignore;
4005 if (!read_index_from_section (objfile, bfd_get_filename (dwz->dwz_bfd),
4007 &dwz->gdb_index, &dwz_map,
4008 &dwz_list, &dwz_list_elements,
4010 &dwz_types_elements_ignore))
4012 warning (_("could not read '.gdb_index' section from %s; skipping"),
4013 bfd_get_filename (dwz->dwz_bfd));
4018 create_cus_from_index (objfile, cu_list, cu_list_elements, dwz_list,
4021 if (types_list_elements)
4023 struct dwarf2_section_info *section;
4025 /* We can only handle a single .debug_types when we have an
4027 if (VEC_length (dwarf2_section_info_def, dwarf2_per_objfile->types) != 1)
4030 section = VEC_index (dwarf2_section_info_def,
4031 dwarf2_per_objfile->types, 0);
4033 create_signatured_type_table_from_index (objfile, section, types_list,
4034 types_list_elements);
4037 create_addrmap_from_index (dwarf2_per_objfile, &local_map);
4039 map = XOBNEW (&objfile->objfile_obstack, struct mapped_index);
4040 map = new (map) mapped_index ();
4043 dwarf2_per_objfile->index_table = map;
4044 dwarf2_per_objfile->using_index = 1;
4045 dwarf2_per_objfile->quick_file_names_table =
4046 create_quick_file_names_table (dwarf2_per_objfile->n_comp_units);
4051 /* die_reader_func for dw2_get_file_names. */
4054 dw2_get_file_names_reader (const struct die_reader_specs *reader,
4055 const gdb_byte *info_ptr,
4056 struct die_info *comp_unit_die,
4060 struct dwarf2_cu *cu = reader->cu;
4061 struct dwarf2_per_cu_data *this_cu = cu->per_cu;
4062 struct dwarf2_per_objfile *dwarf2_per_objfile
4063 = cu->per_cu->dwarf2_per_objfile;
4064 struct objfile *objfile = dwarf2_per_objfile->objfile;
4065 struct dwarf2_per_cu_data *lh_cu;
4066 struct attribute *attr;
4069 struct quick_file_names *qfn;
4071 gdb_assert (! this_cu->is_debug_types);
4073 /* Our callers never want to match partial units -- instead they
4074 will match the enclosing full CU. */
4075 if (comp_unit_die->tag == DW_TAG_partial_unit)
4077 this_cu->v.quick->no_file_data = 1;
4085 sect_offset line_offset {};
4087 attr = dwarf2_attr (comp_unit_die, DW_AT_stmt_list, cu);
4090 struct quick_file_names find_entry;
4092 line_offset = (sect_offset) DW_UNSND (attr);
4094 /* We may have already read in this line header (TU line header sharing).
4095 If we have we're done. */
4096 find_entry.hash.dwo_unit = cu->dwo_unit;
4097 find_entry.hash.line_sect_off = line_offset;
4098 slot = htab_find_slot (dwarf2_per_objfile->quick_file_names_table,
4099 &find_entry, INSERT);
4102 lh_cu->v.quick->file_names = (struct quick_file_names *) *slot;
4106 lh = dwarf_decode_line_header (line_offset, cu);
4110 lh_cu->v.quick->no_file_data = 1;
4114 qfn = XOBNEW (&objfile->objfile_obstack, struct quick_file_names);
4115 qfn->hash.dwo_unit = cu->dwo_unit;
4116 qfn->hash.line_sect_off = line_offset;
4117 gdb_assert (slot != NULL);
4120 file_and_directory fnd = find_file_and_directory (comp_unit_die, cu);
4122 qfn->num_file_names = lh->file_names.size ();
4124 XOBNEWVEC (&objfile->objfile_obstack, const char *, lh->file_names.size ());
4125 for (i = 0; i < lh->file_names.size (); ++i)
4126 qfn->file_names[i] = file_full_name (i + 1, lh.get (), fnd.comp_dir);
4127 qfn->real_names = NULL;
4129 lh_cu->v.quick->file_names = qfn;
4132 /* A helper for the "quick" functions which attempts to read the line
4133 table for THIS_CU. */
4135 static struct quick_file_names *
4136 dw2_get_file_names (struct dwarf2_per_cu_data *this_cu)
4138 /* This should never be called for TUs. */
4139 gdb_assert (! this_cu->is_debug_types);
4140 /* Nor type unit groups. */
4141 gdb_assert (! IS_TYPE_UNIT_GROUP (this_cu));
4143 if (this_cu->v.quick->file_names != NULL)
4144 return this_cu->v.quick->file_names;
4145 /* If we know there is no line data, no point in looking again. */
4146 if (this_cu->v.quick->no_file_data)
4149 init_cutu_and_read_dies_simple (this_cu, dw2_get_file_names_reader, NULL);
4151 if (this_cu->v.quick->no_file_data)
4153 return this_cu->v.quick->file_names;
4156 /* A helper for the "quick" functions which computes and caches the
4157 real path for a given file name from the line table. */
4160 dw2_get_real_path (struct objfile *objfile,
4161 struct quick_file_names *qfn, int index)
4163 if (qfn->real_names == NULL)
4164 qfn->real_names = OBSTACK_CALLOC (&objfile->objfile_obstack,
4165 qfn->num_file_names, const char *);
4167 if (qfn->real_names[index] == NULL)
4168 qfn->real_names[index] = gdb_realpath (qfn->file_names[index]).release ();
4170 return qfn->real_names[index];
4173 static struct symtab *
4174 dw2_find_last_source_symtab (struct objfile *objfile)
4176 struct dwarf2_per_objfile *dwarf2_per_objfile
4177 = get_dwarf2_per_objfile (objfile);
4178 int index = dwarf2_per_objfile->n_comp_units - 1;
4179 dwarf2_per_cu_data *dwarf_cu = dw2_get_cutu (dwarf2_per_objfile, index);
4180 compunit_symtab *cust = dw2_instantiate_symtab (dwarf_cu);
4185 return compunit_primary_filetab (cust);
4188 /* Traversal function for dw2_forget_cached_source_info. */
4191 dw2_free_cached_file_names (void **slot, void *info)
4193 struct quick_file_names *file_data = (struct quick_file_names *) *slot;
4195 if (file_data->real_names)
4199 for (i = 0; i < file_data->num_file_names; ++i)
4201 xfree ((void*) file_data->real_names[i]);
4202 file_data->real_names[i] = NULL;
4210 dw2_forget_cached_source_info (struct objfile *objfile)
4212 struct dwarf2_per_objfile *dwarf2_per_objfile
4213 = get_dwarf2_per_objfile (objfile);
4215 htab_traverse_noresize (dwarf2_per_objfile->quick_file_names_table,
4216 dw2_free_cached_file_names, NULL);
4219 /* Helper function for dw2_map_symtabs_matching_filename that expands
4220 the symtabs and calls the iterator. */
4223 dw2_map_expand_apply (struct objfile *objfile,
4224 struct dwarf2_per_cu_data *per_cu,
4225 const char *name, const char *real_path,
4226 gdb::function_view<bool (symtab *)> callback)
4228 struct compunit_symtab *last_made = objfile->compunit_symtabs;
4230 /* Don't visit already-expanded CUs. */
4231 if (per_cu->v.quick->compunit_symtab)
4234 /* This may expand more than one symtab, and we want to iterate over
4236 dw2_instantiate_symtab (per_cu);
4238 return iterate_over_some_symtabs (name, real_path, objfile->compunit_symtabs,
4239 last_made, callback);
4242 /* Implementation of the map_symtabs_matching_filename method. */
4245 dw2_map_symtabs_matching_filename
4246 (struct objfile *objfile, const char *name, const char *real_path,
4247 gdb::function_view<bool (symtab *)> callback)
4250 const char *name_basename = lbasename (name);
4251 struct dwarf2_per_objfile *dwarf2_per_objfile
4252 = get_dwarf2_per_objfile (objfile);
4254 /* The rule is CUs specify all the files, including those used by
4255 any TU, so there's no need to scan TUs here. */
4257 for (int i = 0; i < dwarf2_per_objfile->n_comp_units; ++i)
4260 struct dwarf2_per_cu_data *per_cu = dw2_get_cu (dwarf2_per_objfile, i);
4261 struct quick_file_names *file_data;
4263 /* We only need to look at symtabs not already expanded. */
4264 if (per_cu->v.quick->compunit_symtab)
4267 file_data = dw2_get_file_names (per_cu);
4268 if (file_data == NULL)
4271 for (j = 0; j < file_data->num_file_names; ++j)
4273 const char *this_name = file_data->file_names[j];
4274 const char *this_real_name;
4276 if (compare_filenames_for_search (this_name, name))
4278 if (dw2_map_expand_apply (objfile, per_cu, name, real_path,
4284 /* Before we invoke realpath, which can get expensive when many
4285 files are involved, do a quick comparison of the basenames. */
4286 if (! basenames_may_differ
4287 && FILENAME_CMP (lbasename (this_name), name_basename) != 0)
4290 this_real_name = dw2_get_real_path (objfile, file_data, j);
4291 if (compare_filenames_for_search (this_real_name, name))
4293 if (dw2_map_expand_apply (objfile, per_cu, name, real_path,
4299 if (real_path != NULL)
4301 gdb_assert (IS_ABSOLUTE_PATH (real_path));
4302 gdb_assert (IS_ABSOLUTE_PATH (name));
4303 if (this_real_name != NULL
4304 && FILENAME_CMP (real_path, this_real_name) == 0)
4306 if (dw2_map_expand_apply (objfile, per_cu, name, real_path,
4318 /* Struct used to manage iterating over all CUs looking for a symbol. */
4320 struct dw2_symtab_iterator
4322 /* The dwarf2_per_objfile owning the CUs we are iterating on. */
4323 struct dwarf2_per_objfile *dwarf2_per_objfile;
4324 /* If non-zero, only look for symbols that match BLOCK_INDEX. */
4325 int want_specific_block;
4326 /* One of GLOBAL_BLOCK or STATIC_BLOCK.
4327 Unused if !WANT_SPECIFIC_BLOCK. */
4329 /* The kind of symbol we're looking for. */
4331 /* The list of CUs from the index entry of the symbol,
4332 or NULL if not found. */
4334 /* The next element in VEC to look at. */
4336 /* The number of elements in VEC, or zero if there is no match. */
4338 /* Have we seen a global version of the symbol?
4339 If so we can ignore all further global instances.
4340 This is to work around gold/15646, inefficient gold-generated
4345 /* Initialize the index symtab iterator ITER.
4346 If WANT_SPECIFIC_BLOCK is non-zero, only look for symbols
4347 in block BLOCK_INDEX. Otherwise BLOCK_INDEX is ignored. */
4350 dw2_symtab_iter_init (struct dw2_symtab_iterator *iter,
4351 struct dwarf2_per_objfile *dwarf2_per_objfile,
4352 int want_specific_block,
4357 iter->dwarf2_per_objfile = dwarf2_per_objfile;
4358 iter->want_specific_block = want_specific_block;
4359 iter->block_index = block_index;
4360 iter->domain = domain;
4362 iter->global_seen = 0;
4364 mapped_index *index = dwarf2_per_objfile->index_table;
4366 /* index is NULL if OBJF_READNOW. */
4367 if (index != NULL && find_slot_in_mapped_hash (index, name, &iter->vec))
4368 iter->length = MAYBE_SWAP (*iter->vec);
4376 /* Return the next matching CU or NULL if there are no more. */
4378 static struct dwarf2_per_cu_data *
4379 dw2_symtab_iter_next (struct dw2_symtab_iterator *iter)
4381 struct dwarf2_per_objfile *dwarf2_per_objfile = iter->dwarf2_per_objfile;
4383 for ( ; iter->next < iter->length; ++iter->next)
4385 offset_type cu_index_and_attrs =
4386 MAYBE_SWAP (iter->vec[iter->next + 1]);
4387 offset_type cu_index = GDB_INDEX_CU_VALUE (cu_index_and_attrs);
4388 struct dwarf2_per_cu_data *per_cu;
4389 int want_static = iter->block_index != GLOBAL_BLOCK;
4390 /* This value is only valid for index versions >= 7. */
4391 int is_static = GDB_INDEX_SYMBOL_STATIC_VALUE (cu_index_and_attrs);
4392 gdb_index_symbol_kind symbol_kind =
4393 GDB_INDEX_SYMBOL_KIND_VALUE (cu_index_and_attrs);
4394 /* Only check the symbol attributes if they're present.
4395 Indices prior to version 7 don't record them,
4396 and indices >= 7 may elide them for certain symbols
4397 (gold does this). */
4399 (dwarf2_per_objfile->index_table->version >= 7
4400 && symbol_kind != GDB_INDEX_SYMBOL_KIND_NONE);
4402 /* Don't crash on bad data. */
4403 if (cu_index >= (dwarf2_per_objfile->n_comp_units
4404 + dwarf2_per_objfile->n_type_units))
4406 complaint (&symfile_complaints,
4407 _(".gdb_index entry has bad CU index"
4409 objfile_name (dwarf2_per_objfile->objfile));
4413 per_cu = dw2_get_cutu (dwarf2_per_objfile, cu_index);
4415 /* Skip if already read in. */
4416 if (per_cu->v.quick->compunit_symtab)
4419 /* Check static vs global. */
4422 if (iter->want_specific_block
4423 && want_static != is_static)
4425 /* Work around gold/15646. */
4426 if (!is_static && iter->global_seen)
4429 iter->global_seen = 1;
4432 /* Only check the symbol's kind if it has one. */
4435 switch (iter->domain)
4438 if (symbol_kind != GDB_INDEX_SYMBOL_KIND_VARIABLE
4439 && symbol_kind != GDB_INDEX_SYMBOL_KIND_FUNCTION
4440 /* Some types are also in VAR_DOMAIN. */
4441 && symbol_kind != GDB_INDEX_SYMBOL_KIND_TYPE)
4445 if (symbol_kind != GDB_INDEX_SYMBOL_KIND_TYPE)
4449 if (symbol_kind != GDB_INDEX_SYMBOL_KIND_OTHER)
4464 static struct compunit_symtab *
4465 dw2_lookup_symbol (struct objfile *objfile, int block_index,
4466 const char *name, domain_enum domain)
4468 struct compunit_symtab *stab_best = NULL;
4469 struct dwarf2_per_objfile *dwarf2_per_objfile
4470 = get_dwarf2_per_objfile (objfile);
4472 lookup_name_info lookup_name (name, symbol_name_match_type::FULL);
4474 struct dw2_symtab_iterator iter;
4475 struct dwarf2_per_cu_data *per_cu;
4477 dw2_symtab_iter_init (&iter, dwarf2_per_objfile, 1, block_index, domain, name);
4479 while ((per_cu = dw2_symtab_iter_next (&iter)) != NULL)
4481 struct symbol *sym, *with_opaque = NULL;
4482 struct compunit_symtab *stab = dw2_instantiate_symtab (per_cu);
4483 const struct blockvector *bv = COMPUNIT_BLOCKVECTOR (stab);
4484 struct block *block = BLOCKVECTOR_BLOCK (bv, block_index);
4486 sym = block_find_symbol (block, name, domain,
4487 block_find_non_opaque_type_preferred,
4490 /* Some caution must be observed with overloaded functions
4491 and methods, since the index will not contain any overload
4492 information (but NAME might contain it). */
4495 && SYMBOL_MATCHES_SEARCH_NAME (sym, lookup_name))
4497 if (with_opaque != NULL
4498 && SYMBOL_MATCHES_SEARCH_NAME (with_opaque, lookup_name))
4501 /* Keep looking through other CUs. */
4508 dw2_print_stats (struct objfile *objfile)
4510 struct dwarf2_per_objfile *dwarf2_per_objfile
4511 = get_dwarf2_per_objfile (objfile);
4512 int total = dwarf2_per_objfile->n_comp_units + dwarf2_per_objfile->n_type_units;
4515 for (int i = 0; i < total; ++i)
4517 struct dwarf2_per_cu_data *per_cu = dw2_get_cutu (dwarf2_per_objfile, i);
4519 if (!per_cu->v.quick->compunit_symtab)
4522 printf_filtered (_(" Number of read CUs: %d\n"), total - count);
4523 printf_filtered (_(" Number of unread CUs: %d\n"), count);
4526 /* This dumps minimal information about the index.
4527 It is called via "mt print objfiles".
4528 One use is to verify .gdb_index has been loaded by the
4529 gdb.dwarf2/gdb-index.exp testcase. */
4532 dw2_dump (struct objfile *objfile)
4534 struct dwarf2_per_objfile *dwarf2_per_objfile
4535 = get_dwarf2_per_objfile (objfile);
4537 gdb_assert (dwarf2_per_objfile->using_index);
4538 printf_filtered (".gdb_index:");
4539 if (dwarf2_per_objfile->index_table != NULL)
4541 printf_filtered (" version %d\n",
4542 dwarf2_per_objfile->index_table->version);
4545 printf_filtered (" faked for \"readnow\"\n");
4546 printf_filtered ("\n");
4550 dw2_relocate (struct objfile *objfile,
4551 const struct section_offsets *new_offsets,
4552 const struct section_offsets *delta)
4554 /* There's nothing to relocate here. */
4558 dw2_expand_symtabs_for_function (struct objfile *objfile,
4559 const char *func_name)
4561 struct dwarf2_per_objfile *dwarf2_per_objfile
4562 = get_dwarf2_per_objfile (objfile);
4564 struct dw2_symtab_iterator iter;
4565 struct dwarf2_per_cu_data *per_cu;
4567 /* Note: It doesn't matter what we pass for block_index here. */
4568 dw2_symtab_iter_init (&iter, dwarf2_per_objfile, 0, GLOBAL_BLOCK, VAR_DOMAIN,
4571 while ((per_cu = dw2_symtab_iter_next (&iter)) != NULL)
4572 dw2_instantiate_symtab (per_cu);
4577 dw2_expand_all_symtabs (struct objfile *objfile)
4579 struct dwarf2_per_objfile *dwarf2_per_objfile
4580 = get_dwarf2_per_objfile (objfile);
4581 int total_units = (dwarf2_per_objfile->n_comp_units
4582 + dwarf2_per_objfile->n_type_units);
4584 for (int i = 0; i < total_units; ++i)
4586 struct dwarf2_per_cu_data *per_cu
4587 = dw2_get_cutu (dwarf2_per_objfile, i);
4589 dw2_instantiate_symtab (per_cu);
4594 dw2_expand_symtabs_with_fullname (struct objfile *objfile,
4595 const char *fullname)
4597 struct dwarf2_per_objfile *dwarf2_per_objfile
4598 = get_dwarf2_per_objfile (objfile);
4600 /* We don't need to consider type units here.
4601 This is only called for examining code, e.g. expand_line_sal.
4602 There can be an order of magnitude (or more) more type units
4603 than comp units, and we avoid them if we can. */
4605 for (int i = 0; i < dwarf2_per_objfile->n_comp_units; ++i)
4608 struct dwarf2_per_cu_data *per_cu = dw2_get_cutu (dwarf2_per_objfile, i);
4609 struct quick_file_names *file_data;
4611 /* We only need to look at symtabs not already expanded. */
4612 if (per_cu->v.quick->compunit_symtab)
4615 file_data = dw2_get_file_names (per_cu);
4616 if (file_data == NULL)
4619 for (j = 0; j < file_data->num_file_names; ++j)
4621 const char *this_fullname = file_data->file_names[j];
4623 if (filename_cmp (this_fullname, fullname) == 0)
4625 dw2_instantiate_symtab (per_cu);
4633 dw2_map_matching_symbols (struct objfile *objfile,
4634 const char * name, domain_enum domain,
4636 int (*callback) (struct block *,
4637 struct symbol *, void *),
4638 void *data, symbol_name_match_type match,
4639 symbol_compare_ftype *ordered_compare)
4641 /* Currently unimplemented; used for Ada. The function can be called if the
4642 current language is Ada for a non-Ada objfile using GNU index. As Ada
4643 does not look for non-Ada symbols this function should just return. */
4646 /* Symbol name matcher for .gdb_index names.
4648 Symbol names in .gdb_index have a few particularities:
4650 - There's no indication of which is the language of each symbol.
4652 Since each language has its own symbol name matching algorithm,
4653 and we don't know which language is the right one, we must match
4654 each symbol against all languages. This would be a potential
4655 performance problem if it were not mitigated by the
4656 mapped_index::name_components lookup table, which significantly
4657 reduces the number of times we need to call into this matcher,
4658 making it a non-issue.
4660 - Symbol names in the index have no overload (parameter)
4661 information. I.e., in C++, "foo(int)" and "foo(long)" both
4662 appear as "foo" in the index, for example.
4664 This means that the lookup names passed to the symbol name
4665 matcher functions must have no parameter information either
4666 because (e.g.) symbol search name "foo" does not match
4667 lookup-name "foo(int)" [while swapping search name for lookup
4670 class gdb_index_symbol_name_matcher
4673 /* Prepares the vector of comparison functions for LOOKUP_NAME. */
4674 gdb_index_symbol_name_matcher (const lookup_name_info &lookup_name);
4676 /* Walk all the matcher routines and match SYMBOL_NAME against them.
4677 Returns true if any matcher matches. */
4678 bool matches (const char *symbol_name);
4681 /* A reference to the lookup name we're matching against. */
4682 const lookup_name_info &m_lookup_name;
4684 /* A vector holding all the different symbol name matchers, for all
4686 std::vector<symbol_name_matcher_ftype *> m_symbol_name_matcher_funcs;
4689 gdb_index_symbol_name_matcher::gdb_index_symbol_name_matcher
4690 (const lookup_name_info &lookup_name)
4691 : m_lookup_name (lookup_name)
4693 /* Prepare the vector of comparison functions upfront, to avoid
4694 doing the same work for each symbol. Care is taken to avoid
4695 matching with the same matcher more than once if/when multiple
4696 languages use the same matcher function. */
4697 auto &matchers = m_symbol_name_matcher_funcs;
4698 matchers.reserve (nr_languages);
4700 matchers.push_back (default_symbol_name_matcher);
4702 for (int i = 0; i < nr_languages; i++)
4704 const language_defn *lang = language_def ((enum language) i);
4705 symbol_name_matcher_ftype *name_matcher
4706 = get_symbol_name_matcher (lang, m_lookup_name);
4708 /* Don't insert the same comparison routine more than once.
4709 Note that we do this linear walk instead of a seemingly
4710 cheaper sorted insert, or use a std::set or something like
4711 that, because relative order of function addresses is not
4712 stable. This is not a problem in practice because the number
4713 of supported languages is low, and the cost here is tiny
4714 compared to the number of searches we'll do afterwards using
4716 if (name_matcher != default_symbol_name_matcher
4717 && (std::find (matchers.begin (), matchers.end (), name_matcher)
4718 == matchers.end ()))
4719 matchers.push_back (name_matcher);
4724 gdb_index_symbol_name_matcher::matches (const char *symbol_name)
4726 for (auto matches_name : m_symbol_name_matcher_funcs)
4727 if (matches_name (symbol_name, m_lookup_name, NULL))
4733 /* Starting from a search name, return the string that finds the upper
4734 bound of all strings that start with SEARCH_NAME in a sorted name
4735 list. Returns the empty string to indicate that the upper bound is
4736 the end of the list. */
4739 make_sort_after_prefix_name (const char *search_name)
4741 /* When looking to complete "func", we find the upper bound of all
4742 symbols that start with "func" by looking for where we'd insert
4743 the closest string that would follow "func" in lexicographical
4744 order. Usually, that's "func"-with-last-character-incremented,
4745 i.e. "fund". Mind non-ASCII characters, though. Usually those
4746 will be UTF-8 multi-byte sequences, but we can't be certain.
4747 Especially mind the 0xff character, which is a valid character in
4748 non-UTF-8 source character sets (e.g. Latin1 'ÿ'), and we can't
4749 rule out compilers allowing it in identifiers. Note that
4750 conveniently, strcmp/strcasecmp are specified to compare
4751 characters interpreted as unsigned char. So what we do is treat
4752 the whole string as a base 256 number composed of a sequence of
4753 base 256 "digits" and add 1 to it. I.e., adding 1 to 0xff wraps
4754 to 0, and carries 1 to the following more-significant position.
4755 If the very first character in SEARCH_NAME ends up incremented
4756 and carries/overflows, then the upper bound is the end of the
4757 list. The string after the empty string is also the empty
4760 Some examples of this operation:
4762 SEARCH_NAME => "+1" RESULT
4766 "\xff" "a" "\xff" => "\xff" "b"
4771 Then, with these symbols for example:
4777 completing "func" looks for symbols between "func" and
4778 "func"-with-last-character-incremented, i.e. "fund" (exclusive),
4779 which finds "func" and "func1", but not "fund".
4783 funcÿ (Latin1 'ÿ' [0xff])
4787 completing "funcÿ" looks for symbols between "funcÿ" and "fund"
4788 (exclusive), which finds "funcÿ" and "funcÿ1", but not "fund".
4792 ÿÿ (Latin1 'ÿ' [0xff])
4795 completing "ÿ" or "ÿÿ" looks for symbols between between "ÿÿ" and
4796 the end of the list.
4798 std::string after = search_name;
4799 while (!after.empty () && (unsigned char) after.back () == 0xff)
4801 if (!after.empty ())
4802 after.back () = (unsigned char) after.back () + 1;
4806 /* See declaration. */
4808 std::pair<std::vector<name_component>::const_iterator,
4809 std::vector<name_component>::const_iterator>
4810 mapped_index_base::find_name_components_bounds
4811 (const lookup_name_info &lookup_name_without_params) const
4814 = this->name_components_casing == case_sensitive_on ? strcmp : strcasecmp;
4817 = lookup_name_without_params.cplus ().lookup_name ().c_str ();
4819 /* Comparison function object for lower_bound that matches against a
4820 given symbol name. */
4821 auto lookup_compare_lower = [&] (const name_component &elem,
4824 const char *elem_qualified = this->symbol_name_at (elem.idx);
4825 const char *elem_name = elem_qualified + elem.name_offset;
4826 return name_cmp (elem_name, name) < 0;
4829 /* Comparison function object for upper_bound that matches against a
4830 given symbol name. */
4831 auto lookup_compare_upper = [&] (const char *name,
4832 const name_component &elem)
4834 const char *elem_qualified = this->symbol_name_at (elem.idx);
4835 const char *elem_name = elem_qualified + elem.name_offset;
4836 return name_cmp (name, elem_name) < 0;
4839 auto begin = this->name_components.begin ();
4840 auto end = this->name_components.end ();
4842 /* Find the lower bound. */
4845 if (lookup_name_without_params.completion_mode () && cplus[0] == '\0')
4848 return std::lower_bound (begin, end, cplus, lookup_compare_lower);
4851 /* Find the upper bound. */
4854 if (lookup_name_without_params.completion_mode ())
4856 /* In completion mode, we want UPPER to point past all
4857 symbols names that have the same prefix. I.e., with
4858 these symbols, and completing "func":
4860 function << lower bound
4862 other_function << upper bound
4864 We find the upper bound by looking for the insertion
4865 point of "func"-with-last-character-incremented,
4867 std::string after = make_sort_after_prefix_name (cplus);
4870 return std::lower_bound (lower, end, after.c_str (),
4871 lookup_compare_lower);
4874 return std::upper_bound (lower, end, cplus, lookup_compare_upper);
4877 return {lower, upper};
4880 /* See declaration. */
4883 mapped_index_base::build_name_components ()
4885 if (!this->name_components.empty ())
4888 this->name_components_casing = case_sensitivity;
4890 = this->name_components_casing == case_sensitive_on ? strcmp : strcasecmp;
4892 /* The code below only knows how to break apart components of C++
4893 symbol names (and other languages that use '::' as
4894 namespace/module separator). If we add support for wild matching
4895 to some language that uses some other operator (E.g., Ada, Go and
4896 D use '.'), then we'll need to try splitting the symbol name
4897 according to that language too. Note that Ada does support wild
4898 matching, but doesn't currently support .gdb_index. */
4899 auto count = this->symbol_name_count ();
4900 for (offset_type idx = 0; idx < count; idx++)
4902 if (this->symbol_name_slot_invalid (idx))
4905 const char *name = this->symbol_name_at (idx);
4907 /* Add each name component to the name component table. */
4908 unsigned int previous_len = 0;
4909 for (unsigned int current_len = cp_find_first_component (name);
4910 name[current_len] != '\0';
4911 current_len += cp_find_first_component (name + current_len))
4913 gdb_assert (name[current_len] == ':');
4914 this->name_components.push_back ({previous_len, idx});
4915 /* Skip the '::'. */
4917 previous_len = current_len;
4919 this->name_components.push_back ({previous_len, idx});
4922 /* Sort name_components elements by name. */
4923 auto name_comp_compare = [&] (const name_component &left,
4924 const name_component &right)
4926 const char *left_qualified = this->symbol_name_at (left.idx);
4927 const char *right_qualified = this->symbol_name_at (right.idx);
4929 const char *left_name = left_qualified + left.name_offset;
4930 const char *right_name = right_qualified + right.name_offset;
4932 return name_cmp (left_name, right_name) < 0;
4935 std::sort (this->name_components.begin (),
4936 this->name_components.end (),
4940 /* Helper for dw2_expand_symtabs_matching that works with a
4941 mapped_index_base instead of the containing objfile. This is split
4942 to a separate function in order to be able to unit test the
4943 name_components matching using a mock mapped_index_base. For each
4944 symbol name that matches, calls MATCH_CALLBACK, passing it the
4945 symbol's index in the mapped_index_base symbol table. */
4948 dw2_expand_symtabs_matching_symbol
4949 (mapped_index_base &index,
4950 const lookup_name_info &lookup_name_in,
4951 gdb::function_view<expand_symtabs_symbol_matcher_ftype> symbol_matcher,
4952 enum search_domain kind,
4953 gdb::function_view<void (offset_type)> match_callback)
4955 lookup_name_info lookup_name_without_params
4956 = lookup_name_in.make_ignore_params ();
4957 gdb_index_symbol_name_matcher lookup_name_matcher
4958 (lookup_name_without_params);
4960 /* Build the symbol name component sorted vector, if we haven't
4962 index.build_name_components ();
4964 auto bounds = index.find_name_components_bounds (lookup_name_without_params);
4966 /* Now for each symbol name in range, check to see if we have a name
4967 match, and if so, call the MATCH_CALLBACK callback. */
4969 /* The same symbol may appear more than once in the range though.
4970 E.g., if we're looking for symbols that complete "w", and we have
4971 a symbol named "w1::w2", we'll find the two name components for
4972 that same symbol in the range. To be sure we only call the
4973 callback once per symbol, we first collect the symbol name
4974 indexes that matched in a temporary vector and ignore
4976 std::vector<offset_type> matches;
4977 matches.reserve (std::distance (bounds.first, bounds.second));
4979 for (; bounds.first != bounds.second; ++bounds.first)
4981 const char *qualified = index.symbol_name_at (bounds.first->idx);
4983 if (!lookup_name_matcher.matches (qualified)
4984 || (symbol_matcher != NULL && !symbol_matcher (qualified)))
4987 matches.push_back (bounds.first->idx);
4990 std::sort (matches.begin (), matches.end ());
4992 /* Finally call the callback, once per match. */
4994 for (offset_type idx : matches)
4998 match_callback (idx);
5003 /* Above we use a type wider than idx's for 'prev', since 0 and
5004 (offset_type)-1 are both possible values. */
5005 static_assert (sizeof (prev) > sizeof (offset_type), "");
5010 namespace selftests { namespace dw2_expand_symtabs_matching {
5012 /* A mock .gdb_index/.debug_names-like name index table, enough to
5013 exercise dw2_expand_symtabs_matching_symbol, which works with the
5014 mapped_index_base interface. Builds an index from the symbol list
5015 passed as parameter to the constructor. */
5016 class mock_mapped_index : public mapped_index_base
5019 mock_mapped_index (gdb::array_view<const char *> symbols)
5020 : m_symbol_table (symbols)
5023 DISABLE_COPY_AND_ASSIGN (mock_mapped_index);
5025 /* Return the number of names in the symbol table. */
5026 virtual size_t symbol_name_count () const
5028 return m_symbol_table.size ();
5031 /* Get the name of the symbol at IDX in the symbol table. */
5032 virtual const char *symbol_name_at (offset_type idx) const
5034 return m_symbol_table[idx];
5038 gdb::array_view<const char *> m_symbol_table;
5041 /* Convenience function that converts a NULL pointer to a "<null>"
5042 string, to pass to print routines. */
5045 string_or_null (const char *str)
5047 return str != NULL ? str : "<null>";
5050 /* Check if a lookup_name_info built from
5051 NAME/MATCH_TYPE/COMPLETION_MODE matches the symbols in the mock
5052 index. EXPECTED_LIST is the list of expected matches, in expected
5053 matching order. If no match expected, then an empty list is
5054 specified. Returns true on success. On failure prints a warning
5055 indicating the file:line that failed, and returns false. */
5058 check_match (const char *file, int line,
5059 mock_mapped_index &mock_index,
5060 const char *name, symbol_name_match_type match_type,
5061 bool completion_mode,
5062 std::initializer_list<const char *> expected_list)
5064 lookup_name_info lookup_name (name, match_type, completion_mode);
5066 bool matched = true;
5068 auto mismatch = [&] (const char *expected_str,
5071 warning (_("%s:%d: match_type=%s, looking-for=\"%s\", "
5072 "expected=\"%s\", got=\"%s\"\n"),
5074 (match_type == symbol_name_match_type::FULL
5076 name, string_or_null (expected_str), string_or_null (got));
5080 auto expected_it = expected_list.begin ();
5081 auto expected_end = expected_list.end ();
5083 dw2_expand_symtabs_matching_symbol (mock_index, lookup_name,
5085 [&] (offset_type idx)
5087 const char *matched_name = mock_index.symbol_name_at (idx);
5088 const char *expected_str
5089 = expected_it == expected_end ? NULL : *expected_it++;
5091 if (expected_str == NULL || strcmp (expected_str, matched_name) != 0)
5092 mismatch (expected_str, matched_name);
5095 const char *expected_str
5096 = expected_it == expected_end ? NULL : *expected_it++;
5097 if (expected_str != NULL)
5098 mismatch (expected_str, NULL);
5103 /* The symbols added to the mock mapped_index for testing (in
5105 static const char *test_symbols[] = {
5114 "ns2::tmpl<int>::foo2",
5115 "(anonymous namespace)::A::B::C",
5117 /* These are used to check that the increment-last-char in the
5118 matching algorithm for completion doesn't match "t1_fund" when
5119 completing "t1_func". */
5125 /* A UTF-8 name with multi-byte sequences to make sure that
5126 cp-name-parser understands this as a single identifier ("função"
5127 is "function" in PT). */
5130 /* \377 (0xff) is Latin1 'ÿ'. */
5133 /* \377 (0xff) is Latin1 'ÿ'. */
5137 /* A name with all sorts of complications. Starts with "z" to make
5138 it easier for the completion tests below. */
5139 #define Z_SYM_NAME \
5140 "z::std::tuple<(anonymous namespace)::ui*, std::bar<(anonymous namespace)::ui> >" \
5141 "::tuple<(anonymous namespace)::ui*, " \
5142 "std::default_delete<(anonymous namespace)::ui>, void>"
5147 /* Returns true if the mapped_index_base::find_name_component_bounds
5148 method finds EXPECTED_SYMS in INDEX when looking for SEARCH_NAME,
5149 in completion mode. */
5152 check_find_bounds_finds (mapped_index_base &index,
5153 const char *search_name,
5154 gdb::array_view<const char *> expected_syms)
5156 lookup_name_info lookup_name (search_name,
5157 symbol_name_match_type::FULL, true);
5159 auto bounds = index.find_name_components_bounds (lookup_name);
5161 size_t distance = std::distance (bounds.first, bounds.second);
5162 if (distance != expected_syms.size ())
5165 for (size_t exp_elem = 0; exp_elem < distance; exp_elem++)
5167 auto nc_elem = bounds.first + exp_elem;
5168 const char *qualified = index.symbol_name_at (nc_elem->idx);
5169 if (strcmp (qualified, expected_syms[exp_elem]) != 0)
5176 /* Test the lower-level mapped_index::find_name_component_bounds
5180 test_mapped_index_find_name_component_bounds ()
5182 mock_mapped_index mock_index (test_symbols);
5184 mock_index.build_name_components ();
5186 /* Test the lower-level mapped_index::find_name_component_bounds
5187 method in completion mode. */
5189 static const char *expected_syms[] = {
5194 SELF_CHECK (check_find_bounds_finds (mock_index,
5195 "t1_func", expected_syms));
5198 /* Check that the increment-last-char in the name matching algorithm
5199 for completion doesn't get confused with Ansi1 'ÿ' / 0xff. */
5201 static const char *expected_syms1[] = {
5205 SELF_CHECK (check_find_bounds_finds (mock_index,
5206 "\377", expected_syms1));
5208 static const char *expected_syms2[] = {
5211 SELF_CHECK (check_find_bounds_finds (mock_index,
5212 "\377\377", expected_syms2));
5216 /* Test dw2_expand_symtabs_matching_symbol. */
5219 test_dw2_expand_symtabs_matching_symbol ()
5221 mock_mapped_index mock_index (test_symbols);
5223 /* We let all tests run until the end even if some fails, for debug
5225 bool any_mismatch = false;
5227 /* Create the expected symbols list (an initializer_list). Needed
5228 because lists have commas, and we need to pass them to CHECK,
5229 which is a macro. */
5230 #define EXPECT(...) { __VA_ARGS__ }
5232 /* Wrapper for check_match that passes down the current
5233 __FILE__/__LINE__. */
5234 #define CHECK_MATCH(NAME, MATCH_TYPE, COMPLETION_MODE, EXPECTED_LIST) \
5235 any_mismatch |= !check_match (__FILE__, __LINE__, \
5237 NAME, MATCH_TYPE, COMPLETION_MODE, \
5240 /* Identity checks. */
5241 for (const char *sym : test_symbols)
5243 /* Should be able to match all existing symbols. */
5244 CHECK_MATCH (sym, symbol_name_match_type::FULL, false,
5247 /* Should be able to match all existing symbols with
5249 std::string with_params = std::string (sym) + "(int)";
5250 CHECK_MATCH (with_params.c_str (), symbol_name_match_type::FULL, false,
5253 /* Should be able to match all existing symbols with
5254 parameters and qualifiers. */
5255 with_params = std::string (sym) + " ( int ) const";
5256 CHECK_MATCH (with_params.c_str (), symbol_name_match_type::FULL, false,
5259 /* This should really find sym, but cp-name-parser.y doesn't
5260 know about lvalue/rvalue qualifiers yet. */
5261 with_params = std::string (sym) + " ( int ) &&";
5262 CHECK_MATCH (with_params.c_str (), symbol_name_match_type::FULL, false,
5266 /* Check that the name matching algorithm for completion doesn't get
5267 confused with Latin1 'ÿ' / 0xff. */
5269 static const char str[] = "\377";
5270 CHECK_MATCH (str, symbol_name_match_type::FULL, true,
5271 EXPECT ("\377", "\377\377123"));
5274 /* Check that the increment-last-char in the matching algorithm for
5275 completion doesn't match "t1_fund" when completing "t1_func". */
5277 static const char str[] = "t1_func";
5278 CHECK_MATCH (str, symbol_name_match_type::FULL, true,
5279 EXPECT ("t1_func", "t1_func1"));
5282 /* Check that completion mode works at each prefix of the expected
5285 static const char str[] = "function(int)";
5286 size_t len = strlen (str);
5289 for (size_t i = 1; i < len; i++)
5291 lookup.assign (str, i);
5292 CHECK_MATCH (lookup.c_str (), symbol_name_match_type::FULL, true,
5293 EXPECT ("function"));
5297 /* While "w" is a prefix of both components, the match function
5298 should still only be called once. */
5300 CHECK_MATCH ("w", symbol_name_match_type::FULL, true,
5302 CHECK_MATCH ("w", symbol_name_match_type::WILD, true,
5306 /* Same, with a "complicated" symbol. */
5308 static const char str[] = Z_SYM_NAME;
5309 size_t len = strlen (str);
5312 for (size_t i = 1; i < len; i++)
5314 lookup.assign (str, i);
5315 CHECK_MATCH (lookup.c_str (), symbol_name_match_type::FULL, true,
5316 EXPECT (Z_SYM_NAME));
5320 /* In FULL mode, an incomplete symbol doesn't match. */
5322 CHECK_MATCH ("std::zfunction(int", symbol_name_match_type::FULL, false,
5326 /* A complete symbol with parameters matches any overload, since the
5327 index has no overload info. */
5329 CHECK_MATCH ("std::zfunction(int)", symbol_name_match_type::FULL, true,
5330 EXPECT ("std::zfunction", "std::zfunction2"));
5331 CHECK_MATCH ("zfunction(int)", symbol_name_match_type::WILD, true,
5332 EXPECT ("std::zfunction", "std::zfunction2"));
5333 CHECK_MATCH ("zfunc", symbol_name_match_type::WILD, true,
5334 EXPECT ("std::zfunction", "std::zfunction2"));
5337 /* Check that whitespace is ignored appropriately. A symbol with a
5338 template argument list. */
5340 static const char expected[] = "ns::foo<int>";
5341 CHECK_MATCH ("ns :: foo < int > ", symbol_name_match_type::FULL, false,
5343 CHECK_MATCH ("foo < int > ", symbol_name_match_type::WILD, false,
5347 /* Check that whitespace is ignored appropriately. A symbol with a
5348 template argument list that includes a pointer. */
5350 static const char expected[] = "ns::foo<char*>";
5351 /* Try both completion and non-completion modes. */
5352 static const bool completion_mode[2] = {false, true};
5353 for (size_t i = 0; i < 2; i++)
5355 CHECK_MATCH ("ns :: foo < char * >", symbol_name_match_type::FULL,
5356 completion_mode[i], EXPECT (expected));
5357 CHECK_MATCH ("foo < char * >", symbol_name_match_type::WILD,
5358 completion_mode[i], EXPECT (expected));
5360 CHECK_MATCH ("ns :: foo < char * > (int)", symbol_name_match_type::FULL,
5361 completion_mode[i], EXPECT (expected));
5362 CHECK_MATCH ("foo < char * > (int)", symbol_name_match_type::WILD,
5363 completion_mode[i], EXPECT (expected));
5368 /* Check method qualifiers are ignored. */
5369 static const char expected[] = "ns::foo<char*>";
5370 CHECK_MATCH ("ns :: foo < char * > ( int ) const",
5371 symbol_name_match_type::FULL, true, EXPECT (expected));
5372 CHECK_MATCH ("ns :: foo < char * > ( int ) &&",
5373 symbol_name_match_type::FULL, true, EXPECT (expected));
5374 CHECK_MATCH ("foo < char * > ( int ) const",
5375 symbol_name_match_type::WILD, true, EXPECT (expected));
5376 CHECK_MATCH ("foo < char * > ( int ) &&",
5377 symbol_name_match_type::WILD, true, EXPECT (expected));
5380 /* Test lookup names that don't match anything. */
5382 CHECK_MATCH ("bar2", symbol_name_match_type::WILD, false,
5385 CHECK_MATCH ("doesntexist", symbol_name_match_type::FULL, false,
5389 /* Some wild matching tests, exercising "(anonymous namespace)",
5390 which should not be confused with a parameter list. */
5392 static const char *syms[] = {
5396 "A :: B :: C ( int )",
5401 for (const char *s : syms)
5403 CHECK_MATCH (s, symbol_name_match_type::WILD, false,
5404 EXPECT ("(anonymous namespace)::A::B::C"));
5409 static const char expected[] = "ns2::tmpl<int>::foo2";
5410 CHECK_MATCH ("tmp", symbol_name_match_type::WILD, true,
5412 CHECK_MATCH ("tmpl<", symbol_name_match_type::WILD, true,
5416 SELF_CHECK (!any_mismatch);
5425 test_mapped_index_find_name_component_bounds ();
5426 test_dw2_expand_symtabs_matching_symbol ();
5429 }} // namespace selftests::dw2_expand_symtabs_matching
5431 #endif /* GDB_SELF_TEST */
5433 /* If FILE_MATCHER is NULL or if PER_CU has
5434 dwarf2_per_cu_quick_data::MARK set (see
5435 dw_expand_symtabs_matching_file_matcher), expand the CU and call
5436 EXPANSION_NOTIFY on it. */
5439 dw2_expand_symtabs_matching_one
5440 (struct dwarf2_per_cu_data *per_cu,
5441 gdb::function_view<expand_symtabs_file_matcher_ftype> file_matcher,
5442 gdb::function_view<expand_symtabs_exp_notify_ftype> expansion_notify)
5444 if (file_matcher == NULL || per_cu->v.quick->mark)
5446 bool symtab_was_null
5447 = (per_cu->v.quick->compunit_symtab == NULL);
5449 dw2_instantiate_symtab (per_cu);
5451 if (expansion_notify != NULL
5453 && per_cu->v.quick->compunit_symtab != NULL)
5454 expansion_notify (per_cu->v.quick->compunit_symtab);
5458 /* Helper for dw2_expand_matching symtabs. Called on each symbol
5459 matched, to expand corresponding CUs that were marked. IDX is the
5460 index of the symbol name that matched. */
5463 dw2_expand_marked_cus
5464 (struct dwarf2_per_objfile *dwarf2_per_objfile, offset_type idx,
5465 gdb::function_view<expand_symtabs_file_matcher_ftype> file_matcher,
5466 gdb::function_view<expand_symtabs_exp_notify_ftype> expansion_notify,
5469 offset_type *vec, vec_len, vec_idx;
5470 bool global_seen = false;
5471 mapped_index &index = *dwarf2_per_objfile->index_table;
5473 vec = (offset_type *) (index.constant_pool
5474 + MAYBE_SWAP (index.symbol_table[idx].vec));
5475 vec_len = MAYBE_SWAP (vec[0]);
5476 for (vec_idx = 0; vec_idx < vec_len; ++vec_idx)
5478 struct dwarf2_per_cu_data *per_cu;
5479 offset_type cu_index_and_attrs = MAYBE_SWAP (vec[vec_idx + 1]);
5480 /* This value is only valid for index versions >= 7. */
5481 int is_static = GDB_INDEX_SYMBOL_STATIC_VALUE (cu_index_and_attrs);
5482 gdb_index_symbol_kind symbol_kind =
5483 GDB_INDEX_SYMBOL_KIND_VALUE (cu_index_and_attrs);
5484 int cu_index = GDB_INDEX_CU_VALUE (cu_index_and_attrs);
5485 /* Only check the symbol attributes if they're present.
5486 Indices prior to version 7 don't record them,
5487 and indices >= 7 may elide them for certain symbols
5488 (gold does this). */
5491 && symbol_kind != GDB_INDEX_SYMBOL_KIND_NONE);
5493 /* Work around gold/15646. */
5496 if (!is_static && global_seen)
5502 /* Only check the symbol's kind if it has one. */
5507 case VARIABLES_DOMAIN:
5508 if (symbol_kind != GDB_INDEX_SYMBOL_KIND_VARIABLE)
5511 case FUNCTIONS_DOMAIN:
5512 if (symbol_kind != GDB_INDEX_SYMBOL_KIND_FUNCTION)
5516 if (symbol_kind != GDB_INDEX_SYMBOL_KIND_TYPE)
5524 /* Don't crash on bad data. */
5525 if (cu_index >= (dwarf2_per_objfile->n_comp_units
5526 + dwarf2_per_objfile->n_type_units))
5528 complaint (&symfile_complaints,
5529 _(".gdb_index entry has bad CU index"
5531 objfile_name (dwarf2_per_objfile->objfile));
5535 per_cu = dw2_get_cutu (dwarf2_per_objfile, cu_index);
5536 dw2_expand_symtabs_matching_one (per_cu, file_matcher,
5541 /* If FILE_MATCHER is non-NULL, set all the
5542 dwarf2_per_cu_quick_data::MARK of the current DWARF2_PER_OBJFILE
5543 that match FILE_MATCHER. */
5546 dw_expand_symtabs_matching_file_matcher
5547 (struct dwarf2_per_objfile *dwarf2_per_objfile,
5548 gdb::function_view<expand_symtabs_file_matcher_ftype> file_matcher)
5550 if (file_matcher == NULL)
5553 objfile *const objfile = dwarf2_per_objfile->objfile;
5555 htab_up visited_found (htab_create_alloc (10, htab_hash_pointer,
5557 NULL, xcalloc, xfree));
5558 htab_up visited_not_found (htab_create_alloc (10, htab_hash_pointer,
5560 NULL, xcalloc, xfree));
5562 /* The rule is CUs specify all the files, including those used by
5563 any TU, so there's no need to scan TUs here. */
5565 for (int i = 0; i < dwarf2_per_objfile->n_comp_units; ++i)
5568 struct dwarf2_per_cu_data *per_cu = dw2_get_cu (dwarf2_per_objfile, i);
5569 struct quick_file_names *file_data;
5574 per_cu->v.quick->mark = 0;
5576 /* We only need to look at symtabs not already expanded. */
5577 if (per_cu->v.quick->compunit_symtab)
5580 file_data = dw2_get_file_names (per_cu);
5581 if (file_data == NULL)
5584 if (htab_find (visited_not_found.get (), file_data) != NULL)
5586 else if (htab_find (visited_found.get (), file_data) != NULL)
5588 per_cu->v.quick->mark = 1;
5592 for (j = 0; j < file_data->num_file_names; ++j)
5594 const char *this_real_name;
5596 if (file_matcher (file_data->file_names[j], false))
5598 per_cu->v.quick->mark = 1;
5602 /* Before we invoke realpath, which can get expensive when many
5603 files are involved, do a quick comparison of the basenames. */
5604 if (!basenames_may_differ
5605 && !file_matcher (lbasename (file_data->file_names[j]),
5609 this_real_name = dw2_get_real_path (objfile, file_data, j);
5610 if (file_matcher (this_real_name, false))
5612 per_cu->v.quick->mark = 1;
5617 slot = htab_find_slot (per_cu->v.quick->mark
5618 ? visited_found.get ()
5619 : visited_not_found.get (),
5626 dw2_expand_symtabs_matching
5627 (struct objfile *objfile,
5628 gdb::function_view<expand_symtabs_file_matcher_ftype> file_matcher,
5629 const lookup_name_info &lookup_name,
5630 gdb::function_view<expand_symtabs_symbol_matcher_ftype> symbol_matcher,
5631 gdb::function_view<expand_symtabs_exp_notify_ftype> expansion_notify,
5632 enum search_domain kind)
5634 struct dwarf2_per_objfile *dwarf2_per_objfile
5635 = get_dwarf2_per_objfile (objfile);
5637 /* index_table is NULL if OBJF_READNOW. */
5638 if (!dwarf2_per_objfile->index_table)
5641 dw_expand_symtabs_matching_file_matcher (dwarf2_per_objfile, file_matcher);
5643 mapped_index &index = *dwarf2_per_objfile->index_table;
5645 dw2_expand_symtabs_matching_symbol (index, lookup_name,
5647 kind, [&] (offset_type idx)
5649 dw2_expand_marked_cus (dwarf2_per_objfile, idx, file_matcher,
5650 expansion_notify, kind);
5654 /* A helper for dw2_find_pc_sect_compunit_symtab which finds the most specific
5657 static struct compunit_symtab *
5658 recursively_find_pc_sect_compunit_symtab (struct compunit_symtab *cust,
5663 if (COMPUNIT_BLOCKVECTOR (cust) != NULL
5664 && blockvector_contains_pc (COMPUNIT_BLOCKVECTOR (cust), pc))
5667 if (cust->includes == NULL)
5670 for (i = 0; cust->includes[i]; ++i)
5672 struct compunit_symtab *s = cust->includes[i];
5674 s = recursively_find_pc_sect_compunit_symtab (s, pc);
5682 static struct compunit_symtab *
5683 dw2_find_pc_sect_compunit_symtab (struct objfile *objfile,
5684 struct bound_minimal_symbol msymbol,
5686 struct obj_section *section,
5689 struct dwarf2_per_cu_data *data;
5690 struct compunit_symtab *result;
5692 if (!objfile->psymtabs_addrmap)
5695 data = (struct dwarf2_per_cu_data *) addrmap_find (objfile->psymtabs_addrmap,
5700 if (warn_if_readin && data->v.quick->compunit_symtab)
5701 warning (_("(Internal error: pc %s in read in CU, but not in symtab.)"),
5702 paddress (get_objfile_arch (objfile), pc));
5705 = recursively_find_pc_sect_compunit_symtab (dw2_instantiate_symtab (data),
5707 gdb_assert (result != NULL);
5712 dw2_map_symbol_filenames (struct objfile *objfile, symbol_filename_ftype *fun,
5713 void *data, int need_fullname)
5715 struct dwarf2_per_objfile *dwarf2_per_objfile
5716 = get_dwarf2_per_objfile (objfile);
5718 if (!dwarf2_per_objfile->filenames_cache)
5720 dwarf2_per_objfile->filenames_cache.emplace ();
5722 htab_up visited (htab_create_alloc (10,
5723 htab_hash_pointer, htab_eq_pointer,
5724 NULL, xcalloc, xfree));
5726 /* The rule is CUs specify all the files, including those used
5727 by any TU, so there's no need to scan TUs here. We can
5728 ignore file names coming from already-expanded CUs. */
5730 for (int i = 0; i < dwarf2_per_objfile->n_comp_units; ++i)
5732 dwarf2_per_cu_data *per_cu = dw2_get_cutu (dwarf2_per_objfile, i);
5734 if (per_cu->v.quick->compunit_symtab)
5736 void **slot = htab_find_slot (visited.get (),
5737 per_cu->v.quick->file_names,
5740 *slot = per_cu->v.quick->file_names;
5744 for (int i = 0; i < dwarf2_per_objfile->n_comp_units; ++i)
5746 dwarf2_per_cu_data *per_cu = dw2_get_cu (dwarf2_per_objfile, i);
5747 struct quick_file_names *file_data;
5750 /* We only need to look at symtabs not already expanded. */
5751 if (per_cu->v.quick->compunit_symtab)
5754 file_data = dw2_get_file_names (per_cu);
5755 if (file_data == NULL)
5758 slot = htab_find_slot (visited.get (), file_data, INSERT);
5761 /* Already visited. */
5766 for (int j = 0; j < file_data->num_file_names; ++j)
5768 const char *filename = file_data->file_names[j];
5769 dwarf2_per_objfile->filenames_cache->seen (filename);
5774 dwarf2_per_objfile->filenames_cache->traverse ([&] (const char *filename)
5776 gdb::unique_xmalloc_ptr<char> this_real_name;
5779 this_real_name = gdb_realpath (filename);
5780 (*fun) (filename, this_real_name.get (), data);
5785 dw2_has_symbols (struct objfile *objfile)
5790 const struct quick_symbol_functions dwarf2_gdb_index_functions =
5793 dw2_find_last_source_symtab,
5794 dw2_forget_cached_source_info,
5795 dw2_map_symtabs_matching_filename,
5800 dw2_expand_symtabs_for_function,
5801 dw2_expand_all_symtabs,
5802 dw2_expand_symtabs_with_fullname,
5803 dw2_map_matching_symbols,
5804 dw2_expand_symtabs_matching,
5805 dw2_find_pc_sect_compunit_symtab,
5807 dw2_map_symbol_filenames
5810 /* DWARF-5 debug_names reader. */
5812 /* DWARF-5 augmentation string for GDB's DW_IDX_GNU_* extension. */
5813 static const gdb_byte dwarf5_augmentation[] = { 'G', 'D', 'B', 0 };
5815 /* A helper function that reads the .debug_names section in SECTION
5816 and fills in MAP. FILENAME is the name of the file containing the
5817 section; it is used for error reporting.
5819 Returns true if all went well, false otherwise. */
5822 read_debug_names_from_section (struct objfile *objfile,
5823 const char *filename,
5824 struct dwarf2_section_info *section,
5825 mapped_debug_names &map)
5827 if (dwarf2_section_empty_p (section))
5830 /* Older elfutils strip versions could keep the section in the main
5831 executable while splitting it for the separate debug info file. */
5832 if ((get_section_flags (section) & SEC_HAS_CONTENTS) == 0)
5835 dwarf2_read_section (objfile, section);
5837 map.dwarf5_byte_order = gdbarch_byte_order (get_objfile_arch (objfile));
5839 const gdb_byte *addr = section->buffer;
5841 bfd *const abfd = get_section_bfd_owner (section);
5843 unsigned int bytes_read;
5844 LONGEST length = read_initial_length (abfd, addr, &bytes_read);
5847 map.dwarf5_is_dwarf64 = bytes_read != 4;
5848 map.offset_size = map.dwarf5_is_dwarf64 ? 8 : 4;
5849 if (bytes_read + length != section->size)
5851 /* There may be multiple per-CU indices. */
5852 warning (_("Section .debug_names in %s length %s does not match "
5853 "section length %s, ignoring .debug_names."),
5854 filename, plongest (bytes_read + length),
5855 pulongest (section->size));
5859 /* The version number. */
5860 uint16_t version = read_2_bytes (abfd, addr);
5864 warning (_("Section .debug_names in %s has unsupported version %d, "
5865 "ignoring .debug_names."),
5871 uint16_t padding = read_2_bytes (abfd, addr);
5875 warning (_("Section .debug_names in %s has unsupported padding %d, "
5876 "ignoring .debug_names."),
5881 /* comp_unit_count - The number of CUs in the CU list. */
5882 map.cu_count = read_4_bytes (abfd, addr);
5885 /* local_type_unit_count - The number of TUs in the local TU
5887 map.tu_count = read_4_bytes (abfd, addr);
5890 /* foreign_type_unit_count - The number of TUs in the foreign TU
5892 uint32_t foreign_tu_count = read_4_bytes (abfd, addr);
5894 if (foreign_tu_count != 0)
5896 warning (_("Section .debug_names in %s has unsupported %lu foreign TUs, "
5897 "ignoring .debug_names."),
5898 filename, static_cast<unsigned long> (foreign_tu_count));
5902 /* bucket_count - The number of hash buckets in the hash lookup
5904 map.bucket_count = read_4_bytes (abfd, addr);
5907 /* name_count - The number of unique names in the index. */
5908 map.name_count = read_4_bytes (abfd, addr);
5911 /* abbrev_table_size - The size in bytes of the abbreviations
5913 uint32_t abbrev_table_size = read_4_bytes (abfd, addr);
5916 /* augmentation_string_size - The size in bytes of the augmentation
5917 string. This value is rounded up to a multiple of 4. */
5918 uint32_t augmentation_string_size = read_4_bytes (abfd, addr);
5920 map.augmentation_is_gdb = ((augmentation_string_size
5921 == sizeof (dwarf5_augmentation))
5922 && memcmp (addr, dwarf5_augmentation,
5923 sizeof (dwarf5_augmentation)) == 0);
5924 augmentation_string_size += (-augmentation_string_size) & 3;
5925 addr += augmentation_string_size;
5928 map.cu_table_reordered = addr;
5929 addr += map.cu_count * map.offset_size;
5931 /* List of Local TUs */
5932 map.tu_table_reordered = addr;
5933 addr += map.tu_count * map.offset_size;
5935 /* Hash Lookup Table */
5936 map.bucket_table_reordered = reinterpret_cast<const uint32_t *> (addr);
5937 addr += map.bucket_count * 4;
5938 map.hash_table_reordered = reinterpret_cast<const uint32_t *> (addr);
5939 addr += map.name_count * 4;
5942 map.name_table_string_offs_reordered = addr;
5943 addr += map.name_count * map.offset_size;
5944 map.name_table_entry_offs_reordered = addr;
5945 addr += map.name_count * map.offset_size;
5947 const gdb_byte *abbrev_table_start = addr;
5950 unsigned int bytes_read;
5951 const ULONGEST index_num = read_unsigned_leb128 (abfd, addr, &bytes_read);
5956 const auto insertpair
5957 = map.abbrev_map.emplace (index_num, mapped_debug_names::index_val ());
5958 if (!insertpair.second)
5960 warning (_("Section .debug_names in %s has duplicate index %s, "
5961 "ignoring .debug_names."),
5962 filename, pulongest (index_num));
5965 mapped_debug_names::index_val &indexval = insertpair.first->second;
5966 indexval.dwarf_tag = read_unsigned_leb128 (abfd, addr, &bytes_read);
5971 mapped_debug_names::index_val::attr attr;
5972 attr.dw_idx = read_unsigned_leb128 (abfd, addr, &bytes_read);
5974 attr.form = read_unsigned_leb128 (abfd, addr, &bytes_read);
5976 if (attr.form == DW_FORM_implicit_const)
5978 attr.implicit_const = read_signed_leb128 (abfd, addr,
5982 if (attr.dw_idx == 0 && attr.form == 0)
5984 indexval.attr_vec.push_back (std::move (attr));
5987 if (addr != abbrev_table_start + abbrev_table_size)
5989 warning (_("Section .debug_names in %s has abbreviation_table "
5990 "of size %zu vs. written as %u, ignoring .debug_names."),
5991 filename, addr - abbrev_table_start, abbrev_table_size);
5994 map.entry_pool = addr;
5999 /* A helper for create_cus_from_debug_names that handles the MAP's CU
6003 create_cus_from_debug_names_list (struct dwarf2_per_objfile *dwarf2_per_objfile,
6004 const mapped_debug_names &map,
6005 dwarf2_section_info §ion,
6006 bool is_dwz, int base_offset)
6008 sect_offset sect_off_prev;
6009 for (uint32_t i = 0; i <= map.cu_count; ++i)
6011 sect_offset sect_off_next;
6012 if (i < map.cu_count)
6015 = (sect_offset) (extract_unsigned_integer
6016 (map.cu_table_reordered + i * map.offset_size,
6018 map.dwarf5_byte_order));
6021 sect_off_next = (sect_offset) section.size;
6024 const ULONGEST length = sect_off_next - sect_off_prev;
6025 dwarf2_per_objfile->all_comp_units[base_offset + (i - 1)]
6026 = create_cu_from_index_list (dwarf2_per_objfile, §ion, is_dwz,
6027 sect_off_prev, length);
6029 sect_off_prev = sect_off_next;
6033 /* Read the CU list from the mapped index, and use it to create all
6034 the CU objects for this dwarf2_per_objfile. */
6037 create_cus_from_debug_names (struct dwarf2_per_objfile *dwarf2_per_objfile,
6038 const mapped_debug_names &map,
6039 const mapped_debug_names &dwz_map)
6041 struct objfile *objfile = dwarf2_per_objfile->objfile;
6043 dwarf2_per_objfile->n_comp_units = map.cu_count + dwz_map.cu_count;
6044 dwarf2_per_objfile->all_comp_units
6045 = XOBNEWVEC (&objfile->objfile_obstack, struct dwarf2_per_cu_data *,
6046 dwarf2_per_objfile->n_comp_units);
6048 create_cus_from_debug_names_list (dwarf2_per_objfile, map,
6049 dwarf2_per_objfile->info,
6051 0 /* base_offset */);
6053 if (dwz_map.cu_count == 0)
6056 dwz_file *dwz = dwarf2_get_dwz_file (dwarf2_per_objfile);
6057 create_cus_from_debug_names_list (dwarf2_per_objfile, dwz_map, dwz->info,
6059 map.cu_count /* base_offset */);
6062 /* Read .debug_names. If everything went ok, initialize the "quick"
6063 elements of all the CUs and return true. Otherwise, return false. */
6066 dwarf2_read_debug_names (struct dwarf2_per_objfile *dwarf2_per_objfile)
6068 mapped_debug_names local_map (dwarf2_per_objfile);
6069 mapped_debug_names dwz_map (dwarf2_per_objfile);
6070 struct objfile *objfile = dwarf2_per_objfile->objfile;
6072 if (!read_debug_names_from_section (objfile, objfile_name (objfile),
6073 &dwarf2_per_objfile->debug_names,
6077 /* Don't use the index if it's empty. */
6078 if (local_map.name_count == 0)
6081 /* If there is a .dwz file, read it so we can get its CU list as
6083 dwz_file *dwz = dwarf2_get_dwz_file (dwarf2_per_objfile);
6086 if (!read_debug_names_from_section (objfile,
6087 bfd_get_filename (dwz->dwz_bfd),
6088 &dwz->debug_names, dwz_map))
6090 warning (_("could not read '.debug_names' section from %s; skipping"),
6091 bfd_get_filename (dwz->dwz_bfd));
6096 create_cus_from_debug_names (dwarf2_per_objfile, local_map, dwz_map);
6098 if (local_map.tu_count != 0)
6100 /* We can only handle a single .debug_types when we have an
6102 if (VEC_length (dwarf2_section_info_def, dwarf2_per_objfile->types) != 1)
6105 dwarf2_section_info *section = VEC_index (dwarf2_section_info_def,
6106 dwarf2_per_objfile->types, 0);
6108 create_signatured_type_table_from_debug_names
6109 (dwarf2_per_objfile, local_map, section, &dwarf2_per_objfile->abbrev);
6112 create_addrmap_from_aranges (dwarf2_per_objfile,
6113 &dwarf2_per_objfile->debug_aranges);
6115 dwarf2_per_objfile->debug_names_table.reset
6116 (new mapped_debug_names (dwarf2_per_objfile));
6117 *dwarf2_per_objfile->debug_names_table = std::move (local_map);
6118 dwarf2_per_objfile->using_index = 1;
6119 dwarf2_per_objfile->quick_file_names_table =
6120 create_quick_file_names_table (dwarf2_per_objfile->n_comp_units);
6125 /* Symbol name hashing function as specified by DWARF-5. */
6128 dwarf5_djb_hash (const char *str_)
6130 const unsigned char *str = (const unsigned char *) str_;
6132 /* Note: tolower here ignores UTF-8, which isn't fully compliant.
6133 See http://dwarfstd.org/ShowIssue.php?issue=161027.1. */
6135 uint32_t hash = 5381;
6136 while (int c = *str++)
6137 hash = hash * 33 + tolower (c);
6141 /* Type used to manage iterating over all CUs looking for a symbol for
6144 class dw2_debug_names_iterator
6147 /* If WANT_SPECIFIC_BLOCK is true, only look for symbols in block
6148 BLOCK_INDEX. Otherwise BLOCK_INDEX is ignored. */
6149 dw2_debug_names_iterator (const mapped_debug_names &map,
6150 bool want_specific_block,
6151 block_enum block_index, domain_enum domain,
6153 : m_map (map), m_want_specific_block (want_specific_block),
6154 m_block_index (block_index), m_domain (domain),
6155 m_addr (find_vec_in_debug_names (map, name))
6158 dw2_debug_names_iterator (const mapped_debug_names &map,
6159 search_domain search, uint32_t namei)
6162 m_addr (find_vec_in_debug_names (map, namei))
6165 /* Return the next matching CU or NULL if there are no more. */
6166 dwarf2_per_cu_data *next ();
6169 static const gdb_byte *find_vec_in_debug_names (const mapped_debug_names &map,
6171 static const gdb_byte *find_vec_in_debug_names (const mapped_debug_names &map,
6174 /* The internalized form of .debug_names. */
6175 const mapped_debug_names &m_map;
6177 /* If true, only look for symbols that match BLOCK_INDEX. */
6178 const bool m_want_specific_block = false;
6180 /* One of GLOBAL_BLOCK or STATIC_BLOCK.
6181 Unused if !WANT_SPECIFIC_BLOCK - FIRST_LOCAL_BLOCK is an invalid
6183 const block_enum m_block_index = FIRST_LOCAL_BLOCK;
6185 /* The kind of symbol we're looking for. */
6186 const domain_enum m_domain = UNDEF_DOMAIN;
6187 const search_domain m_search = ALL_DOMAIN;
6189 /* The list of CUs from the index entry of the symbol, or NULL if
6191 const gdb_byte *m_addr;
6195 mapped_debug_names::namei_to_name (uint32_t namei) const
6197 const ULONGEST namei_string_offs
6198 = extract_unsigned_integer ((name_table_string_offs_reordered
6199 + namei * offset_size),
6202 return read_indirect_string_at_offset
6203 (dwarf2_per_objfile, dwarf2_per_objfile->objfile->obfd, namei_string_offs);
6206 /* Find a slot in .debug_names for the object named NAME. If NAME is
6207 found, return pointer to its pool data. If NAME cannot be found,
6211 dw2_debug_names_iterator::find_vec_in_debug_names
6212 (const mapped_debug_names &map, const char *name)
6214 int (*cmp) (const char *, const char *);
6216 if (current_language->la_language == language_cplus
6217 || current_language->la_language == language_fortran
6218 || current_language->la_language == language_d)
6220 /* NAME is already canonical. Drop any qualifiers as
6221 .debug_names does not contain any. */
6223 if (strchr (name, '(') != NULL)
6225 gdb::unique_xmalloc_ptr<char> without_params
6226 = cp_remove_params (name);
6228 if (without_params != NULL)
6230 name = without_params.get();
6235 cmp = (case_sensitivity == case_sensitive_on ? strcmp : strcasecmp);
6237 const uint32_t full_hash = dwarf5_djb_hash (name);
6239 = extract_unsigned_integer (reinterpret_cast<const gdb_byte *>
6240 (map.bucket_table_reordered
6241 + (full_hash % map.bucket_count)), 4,
6242 map.dwarf5_byte_order);
6246 if (namei >= map.name_count)
6248 complaint (&symfile_complaints,
6249 _("Wrong .debug_names with name index %u but name_count=%u "
6251 namei, map.name_count,
6252 objfile_name (map.dwarf2_per_objfile->objfile));
6258 const uint32_t namei_full_hash
6259 = extract_unsigned_integer (reinterpret_cast<const gdb_byte *>
6260 (map.hash_table_reordered + namei), 4,
6261 map.dwarf5_byte_order);
6262 if (full_hash % map.bucket_count != namei_full_hash % map.bucket_count)
6265 if (full_hash == namei_full_hash)
6267 const char *const namei_string = map.namei_to_name (namei);
6269 #if 0 /* An expensive sanity check. */
6270 if (namei_full_hash != dwarf5_djb_hash (namei_string))
6272 complaint (&symfile_complaints,
6273 _("Wrong .debug_names hash for string at index %u "
6275 namei, objfile_name (dwarf2_per_objfile->objfile));
6280 if (cmp (namei_string, name) == 0)
6282 const ULONGEST namei_entry_offs
6283 = extract_unsigned_integer ((map.name_table_entry_offs_reordered
6284 + namei * map.offset_size),
6285 map.offset_size, map.dwarf5_byte_order);
6286 return map.entry_pool + namei_entry_offs;
6291 if (namei >= map.name_count)
6297 dw2_debug_names_iterator::find_vec_in_debug_names
6298 (const mapped_debug_names &map, uint32_t namei)
6300 if (namei >= map.name_count)
6302 complaint (&symfile_complaints,
6303 _("Wrong .debug_names with name index %u but name_count=%u "
6305 namei, map.name_count,
6306 objfile_name (map.dwarf2_per_objfile->objfile));
6310 const ULONGEST namei_entry_offs
6311 = extract_unsigned_integer ((map.name_table_entry_offs_reordered
6312 + namei * map.offset_size),
6313 map.offset_size, map.dwarf5_byte_order);
6314 return map.entry_pool + namei_entry_offs;
6317 /* See dw2_debug_names_iterator. */
6319 dwarf2_per_cu_data *
6320 dw2_debug_names_iterator::next ()
6325 struct dwarf2_per_objfile *dwarf2_per_objfile = m_map.dwarf2_per_objfile;
6326 struct objfile *objfile = dwarf2_per_objfile->objfile;
6327 bfd *const abfd = objfile->obfd;
6331 unsigned int bytes_read;
6332 const ULONGEST abbrev = read_unsigned_leb128 (abfd, m_addr, &bytes_read);
6333 m_addr += bytes_read;
6337 const auto indexval_it = m_map.abbrev_map.find (abbrev);
6338 if (indexval_it == m_map.abbrev_map.cend ())
6340 complaint (&symfile_complaints,
6341 _("Wrong .debug_names undefined abbrev code %s "
6343 pulongest (abbrev), objfile_name (objfile));
6346 const mapped_debug_names::index_val &indexval = indexval_it->second;
6347 bool have_is_static = false;
6349 dwarf2_per_cu_data *per_cu = NULL;
6350 for (const mapped_debug_names::index_val::attr &attr : indexval.attr_vec)
6355 case DW_FORM_implicit_const:
6356 ull = attr.implicit_const;
6358 case DW_FORM_flag_present:
6362 ull = read_unsigned_leb128 (abfd, m_addr, &bytes_read);
6363 m_addr += bytes_read;
6366 complaint (&symfile_complaints,
6367 _("Unsupported .debug_names form %s [in module %s]"),
6368 dwarf_form_name (attr.form),
6369 objfile_name (objfile));
6372 switch (attr.dw_idx)
6374 case DW_IDX_compile_unit:
6375 /* Don't crash on bad data. */
6376 if (ull >= dwarf2_per_objfile->n_comp_units)
6378 complaint (&symfile_complaints,
6379 _(".debug_names entry has bad CU index %s"
6382 objfile_name (dwarf2_per_objfile->objfile));
6385 per_cu = dw2_get_cutu (dwarf2_per_objfile, ull);
6387 case DW_IDX_type_unit:
6388 /* Don't crash on bad data. */
6389 if (ull >= dwarf2_per_objfile->n_type_units)
6391 complaint (&symfile_complaints,
6392 _(".debug_names entry has bad TU index %s"
6395 objfile_name (dwarf2_per_objfile->objfile));
6398 per_cu = dw2_get_cutu (dwarf2_per_objfile,
6399 dwarf2_per_objfile->n_comp_units + ull);
6401 case DW_IDX_GNU_internal:
6402 if (!m_map.augmentation_is_gdb)
6404 have_is_static = true;
6407 case DW_IDX_GNU_external:
6408 if (!m_map.augmentation_is_gdb)
6410 have_is_static = true;
6416 /* Skip if already read in. */
6417 if (per_cu->v.quick->compunit_symtab)
6420 /* Check static vs global. */
6423 const bool want_static = m_block_index != GLOBAL_BLOCK;
6424 if (m_want_specific_block && want_static != is_static)
6428 /* Match dw2_symtab_iter_next, symbol_kind
6429 and debug_names::psymbol_tag. */
6433 switch (indexval.dwarf_tag)
6435 case DW_TAG_variable:
6436 case DW_TAG_subprogram:
6437 /* Some types are also in VAR_DOMAIN. */
6438 case DW_TAG_typedef:
6439 case DW_TAG_structure_type:
6446 switch (indexval.dwarf_tag)
6448 case DW_TAG_typedef:
6449 case DW_TAG_structure_type:
6456 switch (indexval.dwarf_tag)
6459 case DW_TAG_variable:
6469 /* Match dw2_expand_symtabs_matching, symbol_kind and
6470 debug_names::psymbol_tag. */
6473 case VARIABLES_DOMAIN:
6474 switch (indexval.dwarf_tag)
6476 case DW_TAG_variable:
6482 case FUNCTIONS_DOMAIN:
6483 switch (indexval.dwarf_tag)
6485 case DW_TAG_subprogram:
6492 switch (indexval.dwarf_tag)
6494 case DW_TAG_typedef:
6495 case DW_TAG_structure_type:
6508 static struct compunit_symtab *
6509 dw2_debug_names_lookup_symbol (struct objfile *objfile, int block_index_int,
6510 const char *name, domain_enum domain)
6512 const block_enum block_index = static_cast<block_enum> (block_index_int);
6513 struct dwarf2_per_objfile *dwarf2_per_objfile
6514 = get_dwarf2_per_objfile (objfile);
6516 const auto &mapp = dwarf2_per_objfile->debug_names_table;
6519 /* index is NULL if OBJF_READNOW. */
6522 const auto &map = *mapp;
6524 dw2_debug_names_iterator iter (map, true /* want_specific_block */,
6525 block_index, domain, name);
6527 struct compunit_symtab *stab_best = NULL;
6528 struct dwarf2_per_cu_data *per_cu;
6529 while ((per_cu = iter.next ()) != NULL)
6531 struct symbol *sym, *with_opaque = NULL;
6532 struct compunit_symtab *stab = dw2_instantiate_symtab (per_cu);
6533 const struct blockvector *bv = COMPUNIT_BLOCKVECTOR (stab);
6534 struct block *block = BLOCKVECTOR_BLOCK (bv, block_index);
6536 sym = block_find_symbol (block, name, domain,
6537 block_find_non_opaque_type_preferred,
6540 /* Some caution must be observed with overloaded functions and
6541 methods, since the index will not contain any overload
6542 information (but NAME might contain it). */
6545 && strcmp_iw (SYMBOL_SEARCH_NAME (sym), name) == 0)
6547 if (with_opaque != NULL
6548 && strcmp_iw (SYMBOL_SEARCH_NAME (with_opaque), name) == 0)
6551 /* Keep looking through other CUs. */
6557 /* This dumps minimal information about .debug_names. It is called
6558 via "mt print objfiles". The gdb.dwarf2/gdb-index.exp testcase
6559 uses this to verify that .debug_names has been loaded. */
6562 dw2_debug_names_dump (struct objfile *objfile)
6564 struct dwarf2_per_objfile *dwarf2_per_objfile
6565 = get_dwarf2_per_objfile (objfile);
6567 gdb_assert (dwarf2_per_objfile->using_index);
6568 printf_filtered (".debug_names:");
6569 if (dwarf2_per_objfile->debug_names_table)
6570 printf_filtered (" exists\n");
6572 printf_filtered (" faked for \"readnow\"\n");
6573 printf_filtered ("\n");
6577 dw2_debug_names_expand_symtabs_for_function (struct objfile *objfile,
6578 const char *func_name)
6580 struct dwarf2_per_objfile *dwarf2_per_objfile
6581 = get_dwarf2_per_objfile (objfile);
6583 /* dwarf2_per_objfile->debug_names_table is NULL if OBJF_READNOW. */
6584 if (dwarf2_per_objfile->debug_names_table)
6586 const mapped_debug_names &map = *dwarf2_per_objfile->debug_names_table;
6588 /* Note: It doesn't matter what we pass for block_index here. */
6589 dw2_debug_names_iterator iter (map, false /* want_specific_block */,
6590 GLOBAL_BLOCK, VAR_DOMAIN, func_name);
6592 struct dwarf2_per_cu_data *per_cu;
6593 while ((per_cu = iter.next ()) != NULL)
6594 dw2_instantiate_symtab (per_cu);
6599 dw2_debug_names_expand_symtabs_matching
6600 (struct objfile *objfile,
6601 gdb::function_view<expand_symtabs_file_matcher_ftype> file_matcher,
6602 const lookup_name_info &lookup_name,
6603 gdb::function_view<expand_symtabs_symbol_matcher_ftype> symbol_matcher,
6604 gdb::function_view<expand_symtabs_exp_notify_ftype> expansion_notify,
6605 enum search_domain kind)
6607 struct dwarf2_per_objfile *dwarf2_per_objfile
6608 = get_dwarf2_per_objfile (objfile);
6610 /* debug_names_table is NULL if OBJF_READNOW. */
6611 if (!dwarf2_per_objfile->debug_names_table)
6614 dw_expand_symtabs_matching_file_matcher (dwarf2_per_objfile, file_matcher);
6616 mapped_debug_names &map = *dwarf2_per_objfile->debug_names_table;
6618 dw2_expand_symtabs_matching_symbol (map, lookup_name,
6620 kind, [&] (offset_type namei)
6622 /* The name was matched, now expand corresponding CUs that were
6624 dw2_debug_names_iterator iter (map, kind, namei);
6626 struct dwarf2_per_cu_data *per_cu;
6627 while ((per_cu = iter.next ()) != NULL)
6628 dw2_expand_symtabs_matching_one (per_cu, file_matcher,
6633 const struct quick_symbol_functions dwarf2_debug_names_functions =
6636 dw2_find_last_source_symtab,
6637 dw2_forget_cached_source_info,
6638 dw2_map_symtabs_matching_filename,
6639 dw2_debug_names_lookup_symbol,
6641 dw2_debug_names_dump,
6643 dw2_debug_names_expand_symtabs_for_function,
6644 dw2_expand_all_symtabs,
6645 dw2_expand_symtabs_with_fullname,
6646 dw2_map_matching_symbols,
6647 dw2_debug_names_expand_symtabs_matching,
6648 dw2_find_pc_sect_compunit_symtab,
6650 dw2_map_symbol_filenames
6653 /* See symfile.h. */
6656 dwarf2_initialize_objfile (struct objfile *objfile, dw_index_kind *index_kind)
6658 struct dwarf2_per_objfile *dwarf2_per_objfile
6659 = get_dwarf2_per_objfile (objfile);
6661 /* If we're about to read full symbols, don't bother with the
6662 indices. In this case we also don't care if some other debug
6663 format is making psymtabs, because they are all about to be
6665 if ((objfile->flags & OBJF_READNOW))
6669 dwarf2_per_objfile->using_index = 1;
6670 create_all_comp_units (dwarf2_per_objfile);
6671 create_all_type_units (dwarf2_per_objfile);
6672 dwarf2_per_objfile->quick_file_names_table =
6673 create_quick_file_names_table (dwarf2_per_objfile->n_comp_units);
6675 for (i = 0; i < (dwarf2_per_objfile->n_comp_units
6676 + dwarf2_per_objfile->n_type_units); ++i)
6678 dwarf2_per_cu_data *per_cu = dw2_get_cutu (dwarf2_per_objfile, i);
6680 per_cu->v.quick = OBSTACK_ZALLOC (&objfile->objfile_obstack,
6681 struct dwarf2_per_cu_quick_data);
6684 /* Return 1 so that gdb sees the "quick" functions. However,
6685 these functions will be no-ops because we will have expanded
6687 *index_kind = dw_index_kind::GDB_INDEX;
6691 if (dwarf2_read_debug_names (dwarf2_per_objfile))
6693 *index_kind = dw_index_kind::DEBUG_NAMES;
6697 if (dwarf2_read_index (objfile))
6699 *index_kind = dw_index_kind::GDB_INDEX;
6708 /* Build a partial symbol table. */
6711 dwarf2_build_psymtabs (struct objfile *objfile)
6713 struct dwarf2_per_objfile *dwarf2_per_objfile
6714 = get_dwarf2_per_objfile (objfile);
6716 if (objfile->global_psymbols.capacity () == 0
6717 && objfile->static_psymbols.capacity () == 0)
6718 init_psymbol_list (objfile, 1024);
6722 /* This isn't really ideal: all the data we allocate on the
6723 objfile's obstack is still uselessly kept around. However,
6724 freeing it seems unsafe. */
6725 psymtab_discarder psymtabs (objfile);
6726 dwarf2_build_psymtabs_hard (dwarf2_per_objfile);
6729 CATCH (except, RETURN_MASK_ERROR)
6731 exception_print (gdb_stderr, except);
6736 /* Return the total length of the CU described by HEADER. */
6739 get_cu_length (const struct comp_unit_head *header)
6741 return header->initial_length_size + header->length;
6744 /* Return TRUE if SECT_OFF is within CU_HEADER. */
6747 offset_in_cu_p (const comp_unit_head *cu_header, sect_offset sect_off)
6749 sect_offset bottom = cu_header->sect_off;
6750 sect_offset top = cu_header->sect_off + get_cu_length (cu_header);
6752 return sect_off >= bottom && sect_off < top;
6755 /* Find the base address of the compilation unit for range lists and
6756 location lists. It will normally be specified by DW_AT_low_pc.
6757 In DWARF-3 draft 4, the base address could be overridden by
6758 DW_AT_entry_pc. It's been removed, but GCC still uses this for
6759 compilation units with discontinuous ranges. */
6762 dwarf2_find_base_address (struct die_info *die, struct dwarf2_cu *cu)
6764 struct attribute *attr;
6767 cu->base_address = 0;
6769 attr = dwarf2_attr (die, DW_AT_entry_pc, cu);
6772 cu->base_address = attr_value_as_address (attr);
6777 attr = dwarf2_attr (die, DW_AT_low_pc, cu);
6780 cu->base_address = attr_value_as_address (attr);
6786 /* Read in the comp unit header information from the debug_info at info_ptr.
6787 Use rcuh_kind::COMPILE as the default type if not known by the caller.
6788 NOTE: This leaves members offset, first_die_offset to be filled in
6791 static const gdb_byte *
6792 read_comp_unit_head (struct comp_unit_head *cu_header,
6793 const gdb_byte *info_ptr,
6794 struct dwarf2_section_info *section,
6795 rcuh_kind section_kind)
6798 unsigned int bytes_read;
6799 const char *filename = get_section_file_name (section);
6800 bfd *abfd = get_section_bfd_owner (section);
6802 cu_header->length = read_initial_length (abfd, info_ptr, &bytes_read);
6803 cu_header->initial_length_size = bytes_read;
6804 cu_header->offset_size = (bytes_read == 4) ? 4 : 8;
6805 info_ptr += bytes_read;
6806 cu_header->version = read_2_bytes (abfd, info_ptr);
6808 if (cu_header->version < 5)
6809 switch (section_kind)
6811 case rcuh_kind::COMPILE:
6812 cu_header->unit_type = DW_UT_compile;
6814 case rcuh_kind::TYPE:
6815 cu_header->unit_type = DW_UT_type;
6818 internal_error (__FILE__, __LINE__,
6819 _("read_comp_unit_head: invalid section_kind"));
6823 cu_header->unit_type = static_cast<enum dwarf_unit_type>
6824 (read_1_byte (abfd, info_ptr));
6826 switch (cu_header->unit_type)
6829 if (section_kind != rcuh_kind::COMPILE)
6830 error (_("Dwarf Error: wrong unit_type in compilation unit header "
6831 "(is DW_UT_compile, should be DW_UT_type) [in module %s]"),
6835 section_kind = rcuh_kind::TYPE;
6838 error (_("Dwarf Error: wrong unit_type in compilation unit header "
6839 "(is %d, should be %d or %d) [in module %s]"),
6840 cu_header->unit_type, DW_UT_compile, DW_UT_type, filename);
6843 cu_header->addr_size = read_1_byte (abfd, info_ptr);
6846 cu_header->abbrev_sect_off = (sect_offset) read_offset (abfd, info_ptr,
6849 info_ptr += bytes_read;
6850 if (cu_header->version < 5)
6852 cu_header->addr_size = read_1_byte (abfd, info_ptr);
6855 signed_addr = bfd_get_sign_extend_vma (abfd);
6856 if (signed_addr < 0)
6857 internal_error (__FILE__, __LINE__,
6858 _("read_comp_unit_head: dwarf from non elf file"));
6859 cu_header->signed_addr_p = signed_addr;
6861 if (section_kind == rcuh_kind::TYPE)
6863 LONGEST type_offset;
6865 cu_header->signature = read_8_bytes (abfd, info_ptr);
6868 type_offset = read_offset (abfd, info_ptr, cu_header, &bytes_read);
6869 info_ptr += bytes_read;
6870 cu_header->type_cu_offset_in_tu = (cu_offset) type_offset;
6871 if (to_underlying (cu_header->type_cu_offset_in_tu) != type_offset)
6872 error (_("Dwarf Error: Too big type_offset in compilation unit "
6873 "header (is %s) [in module %s]"), plongest (type_offset),
6880 /* Helper function that returns the proper abbrev section for
6883 static struct dwarf2_section_info *
6884 get_abbrev_section_for_cu (struct dwarf2_per_cu_data *this_cu)
6886 struct dwarf2_section_info *abbrev;
6887 struct dwarf2_per_objfile *dwarf2_per_objfile = this_cu->dwarf2_per_objfile;
6889 if (this_cu->is_dwz)
6890 abbrev = &dwarf2_get_dwz_file (dwarf2_per_objfile)->abbrev;
6892 abbrev = &dwarf2_per_objfile->abbrev;
6897 /* Subroutine of read_and_check_comp_unit_head and
6898 read_and_check_type_unit_head to simplify them.
6899 Perform various error checking on the header. */
6902 error_check_comp_unit_head (struct dwarf2_per_objfile *dwarf2_per_objfile,
6903 struct comp_unit_head *header,
6904 struct dwarf2_section_info *section,
6905 struct dwarf2_section_info *abbrev_section)
6907 const char *filename = get_section_file_name (section);
6909 if (header->version < 2 || header->version > 5)
6910 error (_("Dwarf Error: wrong version in compilation unit header "
6911 "(is %d, should be 2, 3, 4 or 5) [in module %s]"), header->version,
6914 if (to_underlying (header->abbrev_sect_off)
6915 >= dwarf2_section_size (dwarf2_per_objfile->objfile, abbrev_section))
6916 error (_("Dwarf Error: bad offset (%s) in compilation unit header "
6917 "(offset %s + 6) [in module %s]"),
6918 sect_offset_str (header->abbrev_sect_off),
6919 sect_offset_str (header->sect_off),
6922 /* Cast to ULONGEST to use 64-bit arithmetic when possible to
6923 avoid potential 32-bit overflow. */
6924 if (((ULONGEST) header->sect_off + get_cu_length (header))
6926 error (_("Dwarf Error: bad length (0x%x) in compilation unit header "
6927 "(offset %s + 0) [in module %s]"),
6928 header->length, sect_offset_str (header->sect_off),
6932 /* Read in a CU/TU header and perform some basic error checking.
6933 The contents of the header are stored in HEADER.
6934 The result is a pointer to the start of the first DIE. */
6936 static const gdb_byte *
6937 read_and_check_comp_unit_head (struct dwarf2_per_objfile *dwarf2_per_objfile,
6938 struct comp_unit_head *header,
6939 struct dwarf2_section_info *section,
6940 struct dwarf2_section_info *abbrev_section,
6941 const gdb_byte *info_ptr,
6942 rcuh_kind section_kind)
6944 const gdb_byte *beg_of_comp_unit = info_ptr;
6946 header->sect_off = (sect_offset) (beg_of_comp_unit - section->buffer);
6948 info_ptr = read_comp_unit_head (header, info_ptr, section, section_kind);
6950 header->first_die_cu_offset = (cu_offset) (info_ptr - beg_of_comp_unit);
6952 error_check_comp_unit_head (dwarf2_per_objfile, header, section,
6958 /* Fetch the abbreviation table offset from a comp or type unit header. */
6961 read_abbrev_offset (struct dwarf2_per_objfile *dwarf2_per_objfile,
6962 struct dwarf2_section_info *section,
6963 sect_offset sect_off)
6965 bfd *abfd = get_section_bfd_owner (section);
6966 const gdb_byte *info_ptr;
6967 unsigned int initial_length_size, offset_size;
6970 dwarf2_read_section (dwarf2_per_objfile->objfile, section);
6971 info_ptr = section->buffer + to_underlying (sect_off);
6972 read_initial_length (abfd, info_ptr, &initial_length_size);
6973 offset_size = initial_length_size == 4 ? 4 : 8;
6974 info_ptr += initial_length_size;
6976 version = read_2_bytes (abfd, info_ptr);
6980 /* Skip unit type and address size. */
6984 return (sect_offset) read_offset_1 (abfd, info_ptr, offset_size);
6987 /* Allocate a new partial symtab for file named NAME and mark this new
6988 partial symtab as being an include of PST. */
6991 dwarf2_create_include_psymtab (const char *name, struct partial_symtab *pst,
6992 struct objfile *objfile)
6994 struct partial_symtab *subpst = allocate_psymtab (name, objfile);
6996 if (!IS_ABSOLUTE_PATH (subpst->filename))
6998 /* It shares objfile->objfile_obstack. */
6999 subpst->dirname = pst->dirname;
7002 subpst->textlow = 0;
7003 subpst->texthigh = 0;
7005 subpst->dependencies
7006 = XOBNEW (&objfile->objfile_obstack, struct partial_symtab *);
7007 subpst->dependencies[0] = pst;
7008 subpst->number_of_dependencies = 1;
7010 subpst->globals_offset = 0;
7011 subpst->n_global_syms = 0;
7012 subpst->statics_offset = 0;
7013 subpst->n_static_syms = 0;
7014 subpst->compunit_symtab = NULL;
7015 subpst->read_symtab = pst->read_symtab;
7018 /* No private part is necessary for include psymtabs. This property
7019 can be used to differentiate between such include psymtabs and
7020 the regular ones. */
7021 subpst->read_symtab_private = NULL;
7024 /* Read the Line Number Program data and extract the list of files
7025 included by the source file represented by PST. Build an include
7026 partial symtab for each of these included files. */
7029 dwarf2_build_include_psymtabs (struct dwarf2_cu *cu,
7030 struct die_info *die,
7031 struct partial_symtab *pst)
7034 struct attribute *attr;
7036 attr = dwarf2_attr (die, DW_AT_stmt_list, cu);
7038 lh = dwarf_decode_line_header ((sect_offset) DW_UNSND (attr), cu);
7040 return; /* No linetable, so no includes. */
7042 /* NOTE: pst->dirname is DW_AT_comp_dir (if present). */
7043 dwarf_decode_lines (lh.get (), pst->dirname, cu, pst, pst->textlow, 1);
7047 hash_signatured_type (const void *item)
7049 const struct signatured_type *sig_type
7050 = (const struct signatured_type *) item;
7052 /* This drops the top 32 bits of the signature, but is ok for a hash. */
7053 return sig_type->signature;
7057 eq_signatured_type (const void *item_lhs, const void *item_rhs)
7059 const struct signatured_type *lhs = (const struct signatured_type *) item_lhs;
7060 const struct signatured_type *rhs = (const struct signatured_type *) item_rhs;
7062 return lhs->signature == rhs->signature;
7065 /* Allocate a hash table for signatured types. */
7068 allocate_signatured_type_table (struct objfile *objfile)
7070 return htab_create_alloc_ex (41,
7071 hash_signatured_type,
7074 &objfile->objfile_obstack,
7075 hashtab_obstack_allocate,
7076 dummy_obstack_deallocate);
7079 /* A helper function to add a signatured type CU to a table. */
7082 add_signatured_type_cu_to_table (void **slot, void *datum)
7084 struct signatured_type *sigt = (struct signatured_type *) *slot;
7085 struct signatured_type ***datap = (struct signatured_type ***) datum;
7093 /* A helper for create_debug_types_hash_table. Read types from SECTION
7094 and fill them into TYPES_HTAB. It will process only type units,
7095 therefore DW_UT_type. */
7098 create_debug_type_hash_table (struct dwarf2_per_objfile *dwarf2_per_objfile,
7099 struct dwo_file *dwo_file,
7100 dwarf2_section_info *section, htab_t &types_htab,
7101 rcuh_kind section_kind)
7103 struct objfile *objfile = dwarf2_per_objfile->objfile;
7104 struct dwarf2_section_info *abbrev_section;
7106 const gdb_byte *info_ptr, *end_ptr;
7108 abbrev_section = (dwo_file != NULL
7109 ? &dwo_file->sections.abbrev
7110 : &dwarf2_per_objfile->abbrev);
7112 if (dwarf_read_debug)
7113 fprintf_unfiltered (gdb_stdlog, "Reading %s for %s:\n",
7114 get_section_name (section),
7115 get_section_file_name (abbrev_section));
7117 dwarf2_read_section (objfile, section);
7118 info_ptr = section->buffer;
7120 if (info_ptr == NULL)
7123 /* We can't set abfd until now because the section may be empty or
7124 not present, in which case the bfd is unknown. */
7125 abfd = get_section_bfd_owner (section);
7127 /* We don't use init_cutu_and_read_dies_simple, or some such, here
7128 because we don't need to read any dies: the signature is in the
7131 end_ptr = info_ptr + section->size;
7132 while (info_ptr < end_ptr)
7134 struct signatured_type *sig_type;
7135 struct dwo_unit *dwo_tu;
7137 const gdb_byte *ptr = info_ptr;
7138 struct comp_unit_head header;
7139 unsigned int length;
7141 sect_offset sect_off = (sect_offset) (ptr - section->buffer);
7143 /* Initialize it due to a false compiler warning. */
7144 header.signature = -1;
7145 header.type_cu_offset_in_tu = (cu_offset) -1;
7147 /* We need to read the type's signature in order to build the hash
7148 table, but we don't need anything else just yet. */
7150 ptr = read_and_check_comp_unit_head (dwarf2_per_objfile, &header, section,
7151 abbrev_section, ptr, section_kind);
7153 length = get_cu_length (&header);
7155 /* Skip dummy type units. */
7156 if (ptr >= info_ptr + length
7157 || peek_abbrev_code (abfd, ptr) == 0
7158 || header.unit_type != DW_UT_type)
7164 if (types_htab == NULL)
7167 types_htab = allocate_dwo_unit_table (objfile);
7169 types_htab = allocate_signatured_type_table (objfile);
7175 dwo_tu = OBSTACK_ZALLOC (&objfile->objfile_obstack,
7177 dwo_tu->dwo_file = dwo_file;
7178 dwo_tu->signature = header.signature;
7179 dwo_tu->type_offset_in_tu = header.type_cu_offset_in_tu;
7180 dwo_tu->section = section;
7181 dwo_tu->sect_off = sect_off;
7182 dwo_tu->length = length;
7186 /* N.B.: type_offset is not usable if this type uses a DWO file.
7187 The real type_offset is in the DWO file. */
7189 sig_type = OBSTACK_ZALLOC (&objfile->objfile_obstack,
7190 struct signatured_type);
7191 sig_type->signature = header.signature;
7192 sig_type->type_offset_in_tu = header.type_cu_offset_in_tu;
7193 sig_type->per_cu.dwarf2_per_objfile = dwarf2_per_objfile;
7194 sig_type->per_cu.is_debug_types = 1;
7195 sig_type->per_cu.section = section;
7196 sig_type->per_cu.sect_off = sect_off;
7197 sig_type->per_cu.length = length;
7200 slot = htab_find_slot (types_htab,
7201 dwo_file ? (void*) dwo_tu : (void *) sig_type,
7203 gdb_assert (slot != NULL);
7206 sect_offset dup_sect_off;
7210 const struct dwo_unit *dup_tu
7211 = (const struct dwo_unit *) *slot;
7213 dup_sect_off = dup_tu->sect_off;
7217 const struct signatured_type *dup_tu
7218 = (const struct signatured_type *) *slot;
7220 dup_sect_off = dup_tu->per_cu.sect_off;
7223 complaint (&symfile_complaints,
7224 _("debug type entry at offset %s is duplicate to"
7225 " the entry at offset %s, signature %s"),
7226 sect_offset_str (sect_off), sect_offset_str (dup_sect_off),
7227 hex_string (header.signature));
7229 *slot = dwo_file ? (void *) dwo_tu : (void *) sig_type;
7231 if (dwarf_read_debug > 1)
7232 fprintf_unfiltered (gdb_stdlog, " offset %s, signature %s\n",
7233 sect_offset_str (sect_off),
7234 hex_string (header.signature));
7240 /* Create the hash table of all entries in the .debug_types
7241 (or .debug_types.dwo) section(s).
7242 If reading a DWO file, then DWO_FILE is a pointer to the DWO file object,
7243 otherwise it is NULL.
7245 The result is a pointer to the hash table or NULL if there are no types.
7247 Note: This function processes DWO files only, not DWP files. */
7250 create_debug_types_hash_table (struct dwarf2_per_objfile *dwarf2_per_objfile,
7251 struct dwo_file *dwo_file,
7252 VEC (dwarf2_section_info_def) *types,
7256 struct dwarf2_section_info *section;
7258 if (VEC_empty (dwarf2_section_info_def, types))
7262 VEC_iterate (dwarf2_section_info_def, types, ix, section);
7264 create_debug_type_hash_table (dwarf2_per_objfile, dwo_file, section,
7265 types_htab, rcuh_kind::TYPE);
7268 /* Create the hash table of all entries in the .debug_types section,
7269 and initialize all_type_units.
7270 The result is zero if there is an error (e.g. missing .debug_types section),
7271 otherwise non-zero. */
7274 create_all_type_units (struct dwarf2_per_objfile *dwarf2_per_objfile)
7276 htab_t types_htab = NULL;
7277 struct signatured_type **iter;
7279 create_debug_type_hash_table (dwarf2_per_objfile, NULL,
7280 &dwarf2_per_objfile->info, types_htab,
7281 rcuh_kind::COMPILE);
7282 create_debug_types_hash_table (dwarf2_per_objfile, NULL,
7283 dwarf2_per_objfile->types, types_htab);
7284 if (types_htab == NULL)
7286 dwarf2_per_objfile->signatured_types = NULL;
7290 dwarf2_per_objfile->signatured_types = types_htab;
7292 dwarf2_per_objfile->n_type_units
7293 = dwarf2_per_objfile->n_allocated_type_units
7294 = htab_elements (types_htab);
7295 dwarf2_per_objfile->all_type_units =
7296 XNEWVEC (struct signatured_type *, dwarf2_per_objfile->n_type_units);
7297 iter = &dwarf2_per_objfile->all_type_units[0];
7298 htab_traverse_noresize (types_htab, add_signatured_type_cu_to_table, &iter);
7299 gdb_assert (iter - &dwarf2_per_objfile->all_type_units[0]
7300 == dwarf2_per_objfile->n_type_units);
7305 /* Add an entry for signature SIG to dwarf2_per_objfile->signatured_types.
7306 If SLOT is non-NULL, it is the entry to use in the hash table.
7307 Otherwise we find one. */
7309 static struct signatured_type *
7310 add_type_unit (struct dwarf2_per_objfile *dwarf2_per_objfile, ULONGEST sig,
7313 struct objfile *objfile = dwarf2_per_objfile->objfile;
7314 int n_type_units = dwarf2_per_objfile->n_type_units;
7315 struct signatured_type *sig_type;
7317 gdb_assert (n_type_units <= dwarf2_per_objfile->n_allocated_type_units);
7319 if (n_type_units > dwarf2_per_objfile->n_allocated_type_units)
7321 if (dwarf2_per_objfile->n_allocated_type_units == 0)
7322 dwarf2_per_objfile->n_allocated_type_units = 1;
7323 dwarf2_per_objfile->n_allocated_type_units *= 2;
7324 dwarf2_per_objfile->all_type_units
7325 = XRESIZEVEC (struct signatured_type *,
7326 dwarf2_per_objfile->all_type_units,
7327 dwarf2_per_objfile->n_allocated_type_units);
7328 ++dwarf2_per_objfile->tu_stats.nr_all_type_units_reallocs;
7330 dwarf2_per_objfile->n_type_units = n_type_units;
7332 sig_type = OBSTACK_ZALLOC (&objfile->objfile_obstack,
7333 struct signatured_type);
7334 dwarf2_per_objfile->all_type_units[n_type_units - 1] = sig_type;
7335 sig_type->signature = sig;
7336 sig_type->per_cu.is_debug_types = 1;
7337 if (dwarf2_per_objfile->using_index)
7339 sig_type->per_cu.v.quick =
7340 OBSTACK_ZALLOC (&objfile->objfile_obstack,
7341 struct dwarf2_per_cu_quick_data);
7346 slot = htab_find_slot (dwarf2_per_objfile->signatured_types,
7349 gdb_assert (*slot == NULL);
7351 /* The rest of sig_type must be filled in by the caller. */
7355 /* Subroutine of lookup_dwo_signatured_type and lookup_dwp_signatured_type.
7356 Fill in SIG_ENTRY with DWO_ENTRY. */
7359 fill_in_sig_entry_from_dwo_entry (struct dwarf2_per_objfile *dwarf2_per_objfile,
7360 struct signatured_type *sig_entry,
7361 struct dwo_unit *dwo_entry)
7363 /* Make sure we're not clobbering something we don't expect to. */
7364 gdb_assert (! sig_entry->per_cu.queued);
7365 gdb_assert (sig_entry->per_cu.cu == NULL);
7366 if (dwarf2_per_objfile->using_index)
7368 gdb_assert (sig_entry->per_cu.v.quick != NULL);
7369 gdb_assert (sig_entry->per_cu.v.quick->compunit_symtab == NULL);
7372 gdb_assert (sig_entry->per_cu.v.psymtab == NULL);
7373 gdb_assert (sig_entry->signature == dwo_entry->signature);
7374 gdb_assert (to_underlying (sig_entry->type_offset_in_section) == 0);
7375 gdb_assert (sig_entry->type_unit_group == NULL);
7376 gdb_assert (sig_entry->dwo_unit == NULL);
7378 sig_entry->per_cu.section = dwo_entry->section;
7379 sig_entry->per_cu.sect_off = dwo_entry->sect_off;
7380 sig_entry->per_cu.length = dwo_entry->length;
7381 sig_entry->per_cu.reading_dwo_directly = 1;
7382 sig_entry->per_cu.dwarf2_per_objfile = dwarf2_per_objfile;
7383 sig_entry->type_offset_in_tu = dwo_entry->type_offset_in_tu;
7384 sig_entry->dwo_unit = dwo_entry;
7387 /* Subroutine of lookup_signatured_type.
7388 If we haven't read the TU yet, create the signatured_type data structure
7389 for a TU to be read in directly from a DWO file, bypassing the stub.
7390 This is the "Stay in DWO Optimization": When there is no DWP file and we're
7391 using .gdb_index, then when reading a CU we want to stay in the DWO file
7392 containing that CU. Otherwise we could end up reading several other DWO
7393 files (due to comdat folding) to process the transitive closure of all the
7394 mentioned TUs, and that can be slow. The current DWO file will have every
7395 type signature that it needs.
7396 We only do this for .gdb_index because in the psymtab case we already have
7397 to read all the DWOs to build the type unit groups. */
7399 static struct signatured_type *
7400 lookup_dwo_signatured_type (struct dwarf2_cu *cu, ULONGEST sig)
7402 struct dwarf2_per_objfile *dwarf2_per_objfile
7403 = cu->per_cu->dwarf2_per_objfile;
7404 struct objfile *objfile = dwarf2_per_objfile->objfile;
7405 struct dwo_file *dwo_file;
7406 struct dwo_unit find_dwo_entry, *dwo_entry;
7407 struct signatured_type find_sig_entry, *sig_entry;
7410 gdb_assert (cu->dwo_unit && dwarf2_per_objfile->using_index);
7412 /* If TU skeletons have been removed then we may not have read in any
7414 if (dwarf2_per_objfile->signatured_types == NULL)
7416 dwarf2_per_objfile->signatured_types
7417 = allocate_signatured_type_table (objfile);
7420 /* We only ever need to read in one copy of a signatured type.
7421 Use the global signatured_types array to do our own comdat-folding
7422 of types. If this is the first time we're reading this TU, and
7423 the TU has an entry in .gdb_index, replace the recorded data from
7424 .gdb_index with this TU. */
7426 find_sig_entry.signature = sig;
7427 slot = htab_find_slot (dwarf2_per_objfile->signatured_types,
7428 &find_sig_entry, INSERT);
7429 sig_entry = (struct signatured_type *) *slot;
7431 /* We can get here with the TU already read, *or* in the process of being
7432 read. Don't reassign the global entry to point to this DWO if that's
7433 the case. Also note that if the TU is already being read, it may not
7434 have come from a DWO, the program may be a mix of Fission-compiled
7435 code and non-Fission-compiled code. */
7437 /* Have we already tried to read this TU?
7438 Note: sig_entry can be NULL if the skeleton TU was removed (thus it
7439 needn't exist in the global table yet). */
7440 if (sig_entry != NULL && sig_entry->per_cu.tu_read)
7443 /* Note: cu->dwo_unit is the dwo_unit that references this TU, not the
7444 dwo_unit of the TU itself. */
7445 dwo_file = cu->dwo_unit->dwo_file;
7447 /* Ok, this is the first time we're reading this TU. */
7448 if (dwo_file->tus == NULL)
7450 find_dwo_entry.signature = sig;
7451 dwo_entry = (struct dwo_unit *) htab_find (dwo_file->tus, &find_dwo_entry);
7452 if (dwo_entry == NULL)
7455 /* If the global table doesn't have an entry for this TU, add one. */
7456 if (sig_entry == NULL)
7457 sig_entry = add_type_unit (dwarf2_per_objfile, sig, slot);
7459 fill_in_sig_entry_from_dwo_entry (dwarf2_per_objfile, sig_entry, dwo_entry);
7460 sig_entry->per_cu.tu_read = 1;
7464 /* Subroutine of lookup_signatured_type.
7465 Look up the type for signature SIG, and if we can't find SIG in .gdb_index
7466 then try the DWP file. If the TU stub (skeleton) has been removed then
7467 it won't be in .gdb_index. */
7469 static struct signatured_type *
7470 lookup_dwp_signatured_type (struct dwarf2_cu *cu, ULONGEST sig)
7472 struct dwarf2_per_objfile *dwarf2_per_objfile
7473 = cu->per_cu->dwarf2_per_objfile;
7474 struct objfile *objfile = dwarf2_per_objfile->objfile;
7475 struct dwp_file *dwp_file = get_dwp_file (dwarf2_per_objfile);
7476 struct dwo_unit *dwo_entry;
7477 struct signatured_type find_sig_entry, *sig_entry;
7480 gdb_assert (cu->dwo_unit && dwarf2_per_objfile->using_index);
7481 gdb_assert (dwp_file != NULL);
7483 /* If TU skeletons have been removed then we may not have read in any
7485 if (dwarf2_per_objfile->signatured_types == NULL)
7487 dwarf2_per_objfile->signatured_types
7488 = allocate_signatured_type_table (objfile);
7491 find_sig_entry.signature = sig;
7492 slot = htab_find_slot (dwarf2_per_objfile->signatured_types,
7493 &find_sig_entry, INSERT);
7494 sig_entry = (struct signatured_type *) *slot;
7496 /* Have we already tried to read this TU?
7497 Note: sig_entry can be NULL if the skeleton TU was removed (thus it
7498 needn't exist in the global table yet). */
7499 if (sig_entry != NULL)
7502 if (dwp_file->tus == NULL)
7504 dwo_entry = lookup_dwo_unit_in_dwp (dwarf2_per_objfile, dwp_file, NULL,
7505 sig, 1 /* is_debug_types */);
7506 if (dwo_entry == NULL)
7509 sig_entry = add_type_unit (dwarf2_per_objfile, sig, slot);
7510 fill_in_sig_entry_from_dwo_entry (dwarf2_per_objfile, sig_entry, dwo_entry);
7515 /* Lookup a signature based type for DW_FORM_ref_sig8.
7516 Returns NULL if signature SIG is not present in the table.
7517 It is up to the caller to complain about this. */
7519 static struct signatured_type *
7520 lookup_signatured_type (struct dwarf2_cu *cu, ULONGEST sig)
7522 struct dwarf2_per_objfile *dwarf2_per_objfile
7523 = cu->per_cu->dwarf2_per_objfile;
7526 && dwarf2_per_objfile->using_index)
7528 /* We're in a DWO/DWP file, and we're using .gdb_index.
7529 These cases require special processing. */
7530 if (get_dwp_file (dwarf2_per_objfile) == NULL)
7531 return lookup_dwo_signatured_type (cu, sig);
7533 return lookup_dwp_signatured_type (cu, sig);
7537 struct signatured_type find_entry, *entry;
7539 if (dwarf2_per_objfile->signatured_types == NULL)
7541 find_entry.signature = sig;
7542 entry = ((struct signatured_type *)
7543 htab_find (dwarf2_per_objfile->signatured_types, &find_entry));
7548 /* Low level DIE reading support. */
7550 /* Initialize a die_reader_specs struct from a dwarf2_cu struct. */
7553 init_cu_die_reader (struct die_reader_specs *reader,
7554 struct dwarf2_cu *cu,
7555 struct dwarf2_section_info *section,
7556 struct dwo_file *dwo_file,
7557 struct abbrev_table *abbrev_table)
7559 gdb_assert (section->readin && section->buffer != NULL);
7560 reader->abfd = get_section_bfd_owner (section);
7562 reader->dwo_file = dwo_file;
7563 reader->die_section = section;
7564 reader->buffer = section->buffer;
7565 reader->buffer_end = section->buffer + section->size;
7566 reader->comp_dir = NULL;
7567 reader->abbrev_table = abbrev_table;
7570 /* Subroutine of init_cutu_and_read_dies to simplify it.
7571 Read in the rest of a CU/TU top level DIE from DWO_UNIT.
7572 There's just a lot of work to do, and init_cutu_and_read_dies is big enough
7575 STUB_COMP_UNIT_DIE is for the stub DIE, we copy over certain attributes
7576 from it to the DIE in the DWO. If NULL we are skipping the stub.
7577 STUB_COMP_DIR is similar to STUB_COMP_UNIT_DIE: When reading a TU directly
7578 from the DWO file, bypassing the stub, it contains the DW_AT_comp_dir
7579 attribute of the referencing CU. At most one of STUB_COMP_UNIT_DIE and
7580 STUB_COMP_DIR may be non-NULL.
7581 *RESULT_READER,*RESULT_INFO_PTR,*RESULT_COMP_UNIT_DIE,*RESULT_HAS_CHILDREN
7582 are filled in with the info of the DIE from the DWO file.
7583 *RESULT_DWO_ABBREV_TABLE will be filled in with the abbrev table allocated
7584 from the dwo. Since *RESULT_READER references this abbrev table, it must be
7585 kept around for at least as long as *RESULT_READER.
7587 The result is non-zero if a valid (non-dummy) DIE was found. */
7590 read_cutu_die_from_dwo (struct dwarf2_per_cu_data *this_cu,
7591 struct dwo_unit *dwo_unit,
7592 struct die_info *stub_comp_unit_die,
7593 const char *stub_comp_dir,
7594 struct die_reader_specs *result_reader,
7595 const gdb_byte **result_info_ptr,
7596 struct die_info **result_comp_unit_die,
7597 int *result_has_children,
7598 abbrev_table_up *result_dwo_abbrev_table)
7600 struct dwarf2_per_objfile *dwarf2_per_objfile = this_cu->dwarf2_per_objfile;
7601 struct objfile *objfile = dwarf2_per_objfile->objfile;
7602 struct dwarf2_cu *cu = this_cu->cu;
7604 const gdb_byte *begin_info_ptr, *info_ptr;
7605 struct attribute *comp_dir, *stmt_list, *low_pc, *high_pc, *ranges;
7606 int i,num_extra_attrs;
7607 struct dwarf2_section_info *dwo_abbrev_section;
7608 struct attribute *attr;
7609 struct die_info *comp_unit_die;
7611 /* At most one of these may be provided. */
7612 gdb_assert ((stub_comp_unit_die != NULL) + (stub_comp_dir != NULL) <= 1);
7614 /* These attributes aren't processed until later:
7615 DW_AT_stmt_list, DW_AT_low_pc, DW_AT_high_pc, DW_AT_ranges.
7616 DW_AT_comp_dir is used now, to find the DWO file, but it is also
7617 referenced later. However, these attributes are found in the stub
7618 which we won't have later. In order to not impose this complication
7619 on the rest of the code, we read them here and copy them to the
7628 if (stub_comp_unit_die != NULL)
7630 /* For TUs in DWO files, the DW_AT_stmt_list attribute lives in the
7632 if (! this_cu->is_debug_types)
7633 stmt_list = dwarf2_attr (stub_comp_unit_die, DW_AT_stmt_list, cu);
7634 low_pc = dwarf2_attr (stub_comp_unit_die, DW_AT_low_pc, cu);
7635 high_pc = dwarf2_attr (stub_comp_unit_die, DW_AT_high_pc, cu);
7636 ranges = dwarf2_attr (stub_comp_unit_die, DW_AT_ranges, cu);
7637 comp_dir = dwarf2_attr (stub_comp_unit_die, DW_AT_comp_dir, cu);
7639 /* There should be a DW_AT_addr_base attribute here (if needed).
7640 We need the value before we can process DW_FORM_GNU_addr_index. */
7642 attr = dwarf2_attr (stub_comp_unit_die, DW_AT_GNU_addr_base, cu);
7644 cu->addr_base = DW_UNSND (attr);
7646 /* There should be a DW_AT_ranges_base attribute here (if needed).
7647 We need the value before we can process DW_AT_ranges. */
7648 cu->ranges_base = 0;
7649 attr = dwarf2_attr (stub_comp_unit_die, DW_AT_GNU_ranges_base, cu);
7651 cu->ranges_base = DW_UNSND (attr);
7653 else if (stub_comp_dir != NULL)
7655 /* Reconstruct the comp_dir attribute to simplify the code below. */
7656 comp_dir = XOBNEW (&cu->comp_unit_obstack, struct attribute);
7657 comp_dir->name = DW_AT_comp_dir;
7658 comp_dir->form = DW_FORM_string;
7659 DW_STRING_IS_CANONICAL (comp_dir) = 0;
7660 DW_STRING (comp_dir) = stub_comp_dir;
7663 /* Set up for reading the DWO CU/TU. */
7664 cu->dwo_unit = dwo_unit;
7665 dwarf2_section_info *section = dwo_unit->section;
7666 dwarf2_read_section (objfile, section);
7667 abfd = get_section_bfd_owner (section);
7668 begin_info_ptr = info_ptr = (section->buffer
7669 + to_underlying (dwo_unit->sect_off));
7670 dwo_abbrev_section = &dwo_unit->dwo_file->sections.abbrev;
7672 if (this_cu->is_debug_types)
7674 struct signatured_type *sig_type = (struct signatured_type *) this_cu;
7676 info_ptr = read_and_check_comp_unit_head (dwarf2_per_objfile,
7677 &cu->header, section,
7679 info_ptr, rcuh_kind::TYPE);
7680 /* This is not an assert because it can be caused by bad debug info. */
7681 if (sig_type->signature != cu->header.signature)
7683 error (_("Dwarf Error: signature mismatch %s vs %s while reading"
7684 " TU at offset %s [in module %s]"),
7685 hex_string (sig_type->signature),
7686 hex_string (cu->header.signature),
7687 sect_offset_str (dwo_unit->sect_off),
7688 bfd_get_filename (abfd));
7690 gdb_assert (dwo_unit->sect_off == cu->header.sect_off);
7691 /* For DWOs coming from DWP files, we don't know the CU length
7692 nor the type's offset in the TU until now. */
7693 dwo_unit->length = get_cu_length (&cu->header);
7694 dwo_unit->type_offset_in_tu = cu->header.type_cu_offset_in_tu;
7696 /* Establish the type offset that can be used to lookup the type.
7697 For DWO files, we don't know it until now. */
7698 sig_type->type_offset_in_section
7699 = dwo_unit->sect_off + to_underlying (dwo_unit->type_offset_in_tu);
7703 info_ptr = read_and_check_comp_unit_head (dwarf2_per_objfile,
7704 &cu->header, section,
7706 info_ptr, rcuh_kind::COMPILE);
7707 gdb_assert (dwo_unit->sect_off == cu->header.sect_off);
7708 /* For DWOs coming from DWP files, we don't know the CU length
7710 dwo_unit->length = get_cu_length (&cu->header);
7713 *result_dwo_abbrev_table
7714 = abbrev_table_read_table (dwarf2_per_objfile, dwo_abbrev_section,
7715 cu->header.abbrev_sect_off);
7716 init_cu_die_reader (result_reader, cu, section, dwo_unit->dwo_file,
7717 result_dwo_abbrev_table->get ());
7719 /* Read in the die, but leave space to copy over the attributes
7720 from the stub. This has the benefit of simplifying the rest of
7721 the code - all the work to maintain the illusion of a single
7722 DW_TAG_{compile,type}_unit DIE is done here. */
7723 num_extra_attrs = ((stmt_list != NULL)
7727 + (comp_dir != NULL));
7728 info_ptr = read_full_die_1 (result_reader, result_comp_unit_die, info_ptr,
7729 result_has_children, num_extra_attrs);
7731 /* Copy over the attributes from the stub to the DIE we just read in. */
7732 comp_unit_die = *result_comp_unit_die;
7733 i = comp_unit_die->num_attrs;
7734 if (stmt_list != NULL)
7735 comp_unit_die->attrs[i++] = *stmt_list;
7737 comp_unit_die->attrs[i++] = *low_pc;
7738 if (high_pc != NULL)
7739 comp_unit_die->attrs[i++] = *high_pc;
7741 comp_unit_die->attrs[i++] = *ranges;
7742 if (comp_dir != NULL)
7743 comp_unit_die->attrs[i++] = *comp_dir;
7744 comp_unit_die->num_attrs += num_extra_attrs;
7746 if (dwarf_die_debug)
7748 fprintf_unfiltered (gdb_stdlog,
7749 "Read die from %s@0x%x of %s:\n",
7750 get_section_name (section),
7751 (unsigned) (begin_info_ptr - section->buffer),
7752 bfd_get_filename (abfd));
7753 dump_die (comp_unit_die, dwarf_die_debug);
7756 /* Save the comp_dir attribute. If there is no DWP file then we'll read
7757 TUs by skipping the stub and going directly to the entry in the DWO file.
7758 However, skipping the stub means we won't get DW_AT_comp_dir, so we have
7759 to get it via circuitous means. Blech. */
7760 if (comp_dir != NULL)
7761 result_reader->comp_dir = DW_STRING (comp_dir);
7763 /* Skip dummy compilation units. */
7764 if (info_ptr >= begin_info_ptr + dwo_unit->length
7765 || peek_abbrev_code (abfd, info_ptr) == 0)
7768 *result_info_ptr = info_ptr;
7772 /* Subroutine of init_cutu_and_read_dies to simplify it.
7773 Look up the DWO unit specified by COMP_UNIT_DIE of THIS_CU.
7774 Returns NULL if the specified DWO unit cannot be found. */
7776 static struct dwo_unit *
7777 lookup_dwo_unit (struct dwarf2_per_cu_data *this_cu,
7778 struct die_info *comp_unit_die)
7780 struct dwarf2_cu *cu = this_cu->cu;
7782 struct dwo_unit *dwo_unit;
7783 const char *comp_dir, *dwo_name;
7785 gdb_assert (cu != NULL);
7787 /* Yeah, we look dwo_name up again, but it simplifies the code. */
7788 dwo_name = dwarf2_string_attr (comp_unit_die, DW_AT_GNU_dwo_name, cu);
7789 comp_dir = dwarf2_string_attr (comp_unit_die, DW_AT_comp_dir, cu);
7791 if (this_cu->is_debug_types)
7793 struct signatured_type *sig_type;
7795 /* Since this_cu is the first member of struct signatured_type,
7796 we can go from a pointer to one to a pointer to the other. */
7797 sig_type = (struct signatured_type *) this_cu;
7798 signature = sig_type->signature;
7799 dwo_unit = lookup_dwo_type_unit (sig_type, dwo_name, comp_dir);
7803 struct attribute *attr;
7805 attr = dwarf2_attr (comp_unit_die, DW_AT_GNU_dwo_id, cu);
7807 error (_("Dwarf Error: missing dwo_id for dwo_name %s"
7809 dwo_name, objfile_name (this_cu->dwarf2_per_objfile->objfile));
7810 signature = DW_UNSND (attr);
7811 dwo_unit = lookup_dwo_comp_unit (this_cu, dwo_name, comp_dir,
7818 /* Subroutine of init_cutu_and_read_dies to simplify it.
7819 See it for a description of the parameters.
7820 Read a TU directly from a DWO file, bypassing the stub. */
7823 init_tu_and_read_dwo_dies (struct dwarf2_per_cu_data *this_cu,
7824 int use_existing_cu, int keep,
7825 die_reader_func_ftype *die_reader_func,
7828 std::unique_ptr<dwarf2_cu> new_cu;
7829 struct signatured_type *sig_type;
7830 struct die_reader_specs reader;
7831 const gdb_byte *info_ptr;
7832 struct die_info *comp_unit_die;
7834 struct dwarf2_per_objfile *dwarf2_per_objfile = this_cu->dwarf2_per_objfile;
7836 /* Verify we can do the following downcast, and that we have the
7838 gdb_assert (this_cu->is_debug_types && this_cu->reading_dwo_directly);
7839 sig_type = (struct signatured_type *) this_cu;
7840 gdb_assert (sig_type->dwo_unit != NULL);
7842 if (use_existing_cu && this_cu->cu != NULL)
7844 gdb_assert (this_cu->cu->dwo_unit == sig_type->dwo_unit);
7845 /* There's no need to do the rereading_dwo_cu handling that
7846 init_cutu_and_read_dies does since we don't read the stub. */
7850 /* If !use_existing_cu, this_cu->cu must be NULL. */
7851 gdb_assert (this_cu->cu == NULL);
7852 new_cu.reset (new dwarf2_cu (this_cu));
7855 /* A future optimization, if needed, would be to use an existing
7856 abbrev table. When reading DWOs with skeletonless TUs, all the TUs
7857 could share abbrev tables. */
7859 /* The abbreviation table used by READER, this must live at least as long as
7861 abbrev_table_up dwo_abbrev_table;
7863 if (read_cutu_die_from_dwo (this_cu, sig_type->dwo_unit,
7864 NULL /* stub_comp_unit_die */,
7865 sig_type->dwo_unit->dwo_file->comp_dir,
7867 &comp_unit_die, &has_children,
7868 &dwo_abbrev_table) == 0)
7874 /* All the "real" work is done here. */
7875 die_reader_func (&reader, info_ptr, comp_unit_die, has_children, data);
7877 /* This duplicates the code in init_cutu_and_read_dies,
7878 but the alternative is making the latter more complex.
7879 This function is only for the special case of using DWO files directly:
7880 no point in overly complicating the general case just to handle this. */
7881 if (new_cu != NULL && keep)
7883 /* Link this CU into read_in_chain. */
7884 this_cu->cu->read_in_chain = dwarf2_per_objfile->read_in_chain;
7885 dwarf2_per_objfile->read_in_chain = this_cu;
7886 /* The chain owns it now. */
7891 /* Initialize a CU (or TU) and read its DIEs.
7892 If the CU defers to a DWO file, read the DWO file as well.
7894 ABBREV_TABLE, if non-NULL, is the abbreviation table to use.
7895 Otherwise the table specified in the comp unit header is read in and used.
7896 This is an optimization for when we already have the abbrev table.
7898 If USE_EXISTING_CU is non-zero, and THIS_CU->cu is non-NULL, then use it.
7899 Otherwise, a new CU is allocated with xmalloc.
7901 If KEEP is non-zero, then if we allocated a dwarf2_cu we add it to
7902 read_in_chain. Otherwise the dwarf2_cu data is freed at the end.
7904 WARNING: If THIS_CU is a "dummy CU" (used as filler by the incremental
7905 linker) then DIE_READER_FUNC will not get called. */
7908 init_cutu_and_read_dies (struct dwarf2_per_cu_data *this_cu,
7909 struct abbrev_table *abbrev_table,
7910 int use_existing_cu, int keep,
7911 die_reader_func_ftype *die_reader_func,
7914 struct dwarf2_per_objfile *dwarf2_per_objfile = this_cu->dwarf2_per_objfile;
7915 struct objfile *objfile = dwarf2_per_objfile->objfile;
7916 struct dwarf2_section_info *section = this_cu->section;
7917 bfd *abfd = get_section_bfd_owner (section);
7918 struct dwarf2_cu *cu;
7919 const gdb_byte *begin_info_ptr, *info_ptr;
7920 struct die_reader_specs reader;
7921 struct die_info *comp_unit_die;
7923 struct attribute *attr;
7924 struct signatured_type *sig_type = NULL;
7925 struct dwarf2_section_info *abbrev_section;
7926 /* Non-zero if CU currently points to a DWO file and we need to
7927 reread it. When this happens we need to reread the skeleton die
7928 before we can reread the DWO file (this only applies to CUs, not TUs). */
7929 int rereading_dwo_cu = 0;
7931 if (dwarf_die_debug)
7932 fprintf_unfiltered (gdb_stdlog, "Reading %s unit at offset %s\n",
7933 this_cu->is_debug_types ? "type" : "comp",
7934 sect_offset_str (this_cu->sect_off));
7936 if (use_existing_cu)
7939 /* If we're reading a TU directly from a DWO file, including a virtual DWO
7940 file (instead of going through the stub), short-circuit all of this. */
7941 if (this_cu->reading_dwo_directly)
7943 /* Narrow down the scope of possibilities to have to understand. */
7944 gdb_assert (this_cu->is_debug_types);
7945 gdb_assert (abbrev_table == NULL);
7946 init_tu_and_read_dwo_dies (this_cu, use_existing_cu, keep,
7947 die_reader_func, data);
7951 /* This is cheap if the section is already read in. */
7952 dwarf2_read_section (objfile, section);
7954 begin_info_ptr = info_ptr = section->buffer + to_underlying (this_cu->sect_off);
7956 abbrev_section = get_abbrev_section_for_cu (this_cu);
7958 std::unique_ptr<dwarf2_cu> new_cu;
7959 if (use_existing_cu && this_cu->cu != NULL)
7962 /* If this CU is from a DWO file we need to start over, we need to
7963 refetch the attributes from the skeleton CU.
7964 This could be optimized by retrieving those attributes from when we
7965 were here the first time: the previous comp_unit_die was stored in
7966 comp_unit_obstack. But there's no data yet that we need this
7968 if (cu->dwo_unit != NULL)
7969 rereading_dwo_cu = 1;
7973 /* If !use_existing_cu, this_cu->cu must be NULL. */
7974 gdb_assert (this_cu->cu == NULL);
7975 new_cu.reset (new dwarf2_cu (this_cu));
7979 /* Get the header. */
7980 if (to_underlying (cu->header.first_die_cu_offset) != 0 && !rereading_dwo_cu)
7982 /* We already have the header, there's no need to read it in again. */
7983 info_ptr += to_underlying (cu->header.first_die_cu_offset);
7987 if (this_cu->is_debug_types)
7989 info_ptr = read_and_check_comp_unit_head (dwarf2_per_objfile,
7990 &cu->header, section,
7991 abbrev_section, info_ptr,
7994 /* Since per_cu is the first member of struct signatured_type,
7995 we can go from a pointer to one to a pointer to the other. */
7996 sig_type = (struct signatured_type *) this_cu;
7997 gdb_assert (sig_type->signature == cu->header.signature);
7998 gdb_assert (sig_type->type_offset_in_tu
7999 == cu->header.type_cu_offset_in_tu);
8000 gdb_assert (this_cu->sect_off == cu->header.sect_off);
8002 /* LENGTH has not been set yet for type units if we're
8003 using .gdb_index. */
8004 this_cu->length = get_cu_length (&cu->header);
8006 /* Establish the type offset that can be used to lookup the type. */
8007 sig_type->type_offset_in_section =
8008 this_cu->sect_off + to_underlying (sig_type->type_offset_in_tu);
8010 this_cu->dwarf_version = cu->header.version;
8014 info_ptr = read_and_check_comp_unit_head (dwarf2_per_objfile,
8015 &cu->header, section,
8018 rcuh_kind::COMPILE);
8020 gdb_assert (this_cu->sect_off == cu->header.sect_off);
8021 gdb_assert (this_cu->length == get_cu_length (&cu->header));
8022 this_cu->dwarf_version = cu->header.version;
8026 /* Skip dummy compilation units. */
8027 if (info_ptr >= begin_info_ptr + this_cu->length
8028 || peek_abbrev_code (abfd, info_ptr) == 0)
8031 /* If we don't have them yet, read the abbrevs for this compilation unit.
8032 And if we need to read them now, make sure they're freed when we're
8033 done (own the table through ABBREV_TABLE_HOLDER). */
8034 abbrev_table_up abbrev_table_holder;
8035 if (abbrev_table != NULL)
8036 gdb_assert (cu->header.abbrev_sect_off == abbrev_table->sect_off);
8040 = abbrev_table_read_table (dwarf2_per_objfile, abbrev_section,
8041 cu->header.abbrev_sect_off);
8042 abbrev_table = abbrev_table_holder.get ();
8045 /* Read the top level CU/TU die. */
8046 init_cu_die_reader (&reader, cu, section, NULL, abbrev_table);
8047 info_ptr = read_full_die (&reader, &comp_unit_die, info_ptr, &has_children);
8049 /* If we are in a DWO stub, process it and then read in the "real" CU/TU
8050 from the DWO file. read_cutu_die_from_dwo will allocate the abbreviation
8051 table from the DWO file and pass the ownership over to us. It will be
8052 referenced from READER, so we must make sure to free it after we're done
8055 Note that if USE_EXISTING_OK != 0, and THIS_CU->cu already contains a
8056 DWO CU, that this test will fail (the attribute will not be present). */
8057 attr = dwarf2_attr (comp_unit_die, DW_AT_GNU_dwo_name, cu);
8058 abbrev_table_up dwo_abbrev_table;
8061 struct dwo_unit *dwo_unit;
8062 struct die_info *dwo_comp_unit_die;
8066 complaint (&symfile_complaints,
8067 _("compilation unit with DW_AT_GNU_dwo_name"
8068 " has children (offset %s) [in module %s]"),
8069 sect_offset_str (this_cu->sect_off),
8070 bfd_get_filename (abfd));
8072 dwo_unit = lookup_dwo_unit (this_cu, comp_unit_die);
8073 if (dwo_unit != NULL)
8075 if (read_cutu_die_from_dwo (this_cu, dwo_unit,
8076 comp_unit_die, NULL,
8078 &dwo_comp_unit_die, &has_children,
8079 &dwo_abbrev_table) == 0)
8084 comp_unit_die = dwo_comp_unit_die;
8088 /* Yikes, we couldn't find the rest of the DIE, we only have
8089 the stub. A complaint has already been logged. There's
8090 not much more we can do except pass on the stub DIE to
8091 die_reader_func. We don't want to throw an error on bad
8096 /* All of the above is setup for this call. Yikes. */
8097 die_reader_func (&reader, info_ptr, comp_unit_die, has_children, data);
8099 /* Done, clean up. */
8100 if (new_cu != NULL && keep)
8102 /* Link this CU into read_in_chain. */
8103 this_cu->cu->read_in_chain = dwarf2_per_objfile->read_in_chain;
8104 dwarf2_per_objfile->read_in_chain = this_cu;
8105 /* The chain owns it now. */
8110 /* Read CU/TU THIS_CU but do not follow DW_AT_GNU_dwo_name if present.
8111 DWO_FILE, if non-NULL, is the DWO file to read (the caller is assumed
8112 to have already done the lookup to find the DWO file).
8114 The caller is required to fill in THIS_CU->section, THIS_CU->offset, and
8115 THIS_CU->is_debug_types, but nothing else.
8117 We fill in THIS_CU->length.
8119 WARNING: If THIS_CU is a "dummy CU" (used as filler by the incremental
8120 linker) then DIE_READER_FUNC will not get called.
8122 THIS_CU->cu is always freed when done.
8123 This is done in order to not leave THIS_CU->cu in a state where we have
8124 to care whether it refers to the "main" CU or the DWO CU. */
8127 init_cutu_and_read_dies_no_follow (struct dwarf2_per_cu_data *this_cu,
8128 struct dwo_file *dwo_file,
8129 die_reader_func_ftype *die_reader_func,
8132 struct dwarf2_per_objfile *dwarf2_per_objfile = this_cu->dwarf2_per_objfile;
8133 struct objfile *objfile = dwarf2_per_objfile->objfile;
8134 struct dwarf2_section_info *section = this_cu->section;
8135 bfd *abfd = get_section_bfd_owner (section);
8136 struct dwarf2_section_info *abbrev_section;
8137 const gdb_byte *begin_info_ptr, *info_ptr;
8138 struct die_reader_specs reader;
8139 struct die_info *comp_unit_die;
8142 if (dwarf_die_debug)
8143 fprintf_unfiltered (gdb_stdlog, "Reading %s unit at offset %s\n",
8144 this_cu->is_debug_types ? "type" : "comp",
8145 sect_offset_str (this_cu->sect_off));
8147 gdb_assert (this_cu->cu == NULL);
8149 abbrev_section = (dwo_file != NULL
8150 ? &dwo_file->sections.abbrev
8151 : get_abbrev_section_for_cu (this_cu));
8153 /* This is cheap if the section is already read in. */
8154 dwarf2_read_section (objfile, section);
8156 struct dwarf2_cu cu (this_cu);
8158 begin_info_ptr = info_ptr = section->buffer + to_underlying (this_cu->sect_off);
8159 info_ptr = read_and_check_comp_unit_head (dwarf2_per_objfile,
8160 &cu.header, section,
8161 abbrev_section, info_ptr,
8162 (this_cu->is_debug_types
8164 : rcuh_kind::COMPILE));
8166 this_cu->length = get_cu_length (&cu.header);
8168 /* Skip dummy compilation units. */
8169 if (info_ptr >= begin_info_ptr + this_cu->length
8170 || peek_abbrev_code (abfd, info_ptr) == 0)
8173 abbrev_table_up abbrev_table
8174 = abbrev_table_read_table (dwarf2_per_objfile, abbrev_section,
8175 cu.header.abbrev_sect_off);
8177 init_cu_die_reader (&reader, &cu, section, dwo_file, abbrev_table.get ());
8178 info_ptr = read_full_die (&reader, &comp_unit_die, info_ptr, &has_children);
8180 die_reader_func (&reader, info_ptr, comp_unit_die, has_children, data);
8183 /* Read a CU/TU, except that this does not look for DW_AT_GNU_dwo_name and
8184 does not lookup the specified DWO file.
8185 This cannot be used to read DWO files.
8187 THIS_CU->cu is always freed when done.
8188 This is done in order to not leave THIS_CU->cu in a state where we have
8189 to care whether it refers to the "main" CU or the DWO CU.
8190 We can revisit this if the data shows there's a performance issue. */
8193 init_cutu_and_read_dies_simple (struct dwarf2_per_cu_data *this_cu,
8194 die_reader_func_ftype *die_reader_func,
8197 init_cutu_and_read_dies_no_follow (this_cu, NULL, die_reader_func, data);
8200 /* Type Unit Groups.
8202 Type Unit Groups are a way to collapse the set of all TUs (type units) into
8203 a more manageable set. The grouping is done by DW_AT_stmt_list entry
8204 so that all types coming from the same compilation (.o file) are grouped
8205 together. A future step could be to put the types in the same symtab as
8206 the CU the types ultimately came from. */
8209 hash_type_unit_group (const void *item)
8211 const struct type_unit_group *tu_group
8212 = (const struct type_unit_group *) item;
8214 return hash_stmt_list_entry (&tu_group->hash);
8218 eq_type_unit_group (const void *item_lhs, const void *item_rhs)
8220 const struct type_unit_group *lhs = (const struct type_unit_group *) item_lhs;
8221 const struct type_unit_group *rhs = (const struct type_unit_group *) item_rhs;
8223 return eq_stmt_list_entry (&lhs->hash, &rhs->hash);
8226 /* Allocate a hash table for type unit groups. */
8229 allocate_type_unit_groups_table (struct objfile *objfile)
8231 return htab_create_alloc_ex (3,
8232 hash_type_unit_group,
8235 &objfile->objfile_obstack,
8236 hashtab_obstack_allocate,
8237 dummy_obstack_deallocate);
8240 /* Type units that don't have DW_AT_stmt_list are grouped into their own
8241 partial symtabs. We combine several TUs per psymtab to not let the size
8242 of any one psymtab grow too big. */
8243 #define NO_STMT_LIST_TYPE_UNIT_PSYMTAB (1 << 31)
8244 #define NO_STMT_LIST_TYPE_UNIT_PSYMTAB_SIZE 10
8246 /* Helper routine for get_type_unit_group.
8247 Create the type_unit_group object used to hold one or more TUs. */
8249 static struct type_unit_group *
8250 create_type_unit_group (struct dwarf2_cu *cu, sect_offset line_offset_struct)
8252 struct dwarf2_per_objfile *dwarf2_per_objfile
8253 = cu->per_cu->dwarf2_per_objfile;
8254 struct objfile *objfile = dwarf2_per_objfile->objfile;
8255 struct dwarf2_per_cu_data *per_cu;
8256 struct type_unit_group *tu_group;
8258 tu_group = OBSTACK_ZALLOC (&objfile->objfile_obstack,
8259 struct type_unit_group);
8260 per_cu = &tu_group->per_cu;
8261 per_cu->dwarf2_per_objfile = dwarf2_per_objfile;
8263 if (dwarf2_per_objfile->using_index)
8265 per_cu->v.quick = OBSTACK_ZALLOC (&objfile->objfile_obstack,
8266 struct dwarf2_per_cu_quick_data);
8270 unsigned int line_offset = to_underlying (line_offset_struct);
8271 struct partial_symtab *pst;
8274 /* Give the symtab a useful name for debug purposes. */
8275 if ((line_offset & NO_STMT_LIST_TYPE_UNIT_PSYMTAB) != 0)
8276 name = xstrprintf ("<type_units_%d>",
8277 (line_offset & ~NO_STMT_LIST_TYPE_UNIT_PSYMTAB));
8279 name = xstrprintf ("<type_units_at_0x%x>", line_offset);
8281 pst = create_partial_symtab (per_cu, name);
8287 tu_group->hash.dwo_unit = cu->dwo_unit;
8288 tu_group->hash.line_sect_off = line_offset_struct;
8293 /* Look up the type_unit_group for type unit CU, and create it if necessary.
8294 STMT_LIST is a DW_AT_stmt_list attribute. */
8296 static struct type_unit_group *
8297 get_type_unit_group (struct dwarf2_cu *cu, const struct attribute *stmt_list)
8299 struct dwarf2_per_objfile *dwarf2_per_objfile
8300 = cu->per_cu->dwarf2_per_objfile;
8301 struct tu_stats *tu_stats = &dwarf2_per_objfile->tu_stats;
8302 struct type_unit_group *tu_group;
8304 unsigned int line_offset;
8305 struct type_unit_group type_unit_group_for_lookup;
8307 if (dwarf2_per_objfile->type_unit_groups == NULL)
8309 dwarf2_per_objfile->type_unit_groups =
8310 allocate_type_unit_groups_table (dwarf2_per_objfile->objfile);
8313 /* Do we need to create a new group, or can we use an existing one? */
8317 line_offset = DW_UNSND (stmt_list);
8318 ++tu_stats->nr_symtab_sharers;
8322 /* Ugh, no stmt_list. Rare, but we have to handle it.
8323 We can do various things here like create one group per TU or
8324 spread them over multiple groups to split up the expansion work.
8325 To avoid worst case scenarios (too many groups or too large groups)
8326 we, umm, group them in bunches. */
8327 line_offset = (NO_STMT_LIST_TYPE_UNIT_PSYMTAB
8328 | (tu_stats->nr_stmt_less_type_units
8329 / NO_STMT_LIST_TYPE_UNIT_PSYMTAB_SIZE));
8330 ++tu_stats->nr_stmt_less_type_units;
8333 type_unit_group_for_lookup.hash.dwo_unit = cu->dwo_unit;
8334 type_unit_group_for_lookup.hash.line_sect_off = (sect_offset) line_offset;
8335 slot = htab_find_slot (dwarf2_per_objfile->type_unit_groups,
8336 &type_unit_group_for_lookup, INSERT);
8339 tu_group = (struct type_unit_group *) *slot;
8340 gdb_assert (tu_group != NULL);
8344 sect_offset line_offset_struct = (sect_offset) line_offset;
8345 tu_group = create_type_unit_group (cu, line_offset_struct);
8347 ++tu_stats->nr_symtabs;
8353 /* Partial symbol tables. */
8355 /* Create a psymtab named NAME and assign it to PER_CU.
8357 The caller must fill in the following details:
8358 dirname, textlow, texthigh. */
8360 static struct partial_symtab *
8361 create_partial_symtab (struct dwarf2_per_cu_data *per_cu, const char *name)
8363 struct objfile *objfile = per_cu->dwarf2_per_objfile->objfile;
8364 struct partial_symtab *pst;
8366 pst = start_psymtab_common (objfile, name, 0,
8367 objfile->global_psymbols,
8368 objfile->static_psymbols);
8370 pst->psymtabs_addrmap_supported = 1;
8372 /* This is the glue that links PST into GDB's symbol API. */
8373 pst->read_symtab_private = per_cu;
8374 pst->read_symtab = dwarf2_read_symtab;
8375 per_cu->v.psymtab = pst;
8380 /* The DATA object passed to process_psymtab_comp_unit_reader has this
8383 struct process_psymtab_comp_unit_data
8385 /* True if we are reading a DW_TAG_partial_unit. */
8387 int want_partial_unit;
8389 /* The "pretend" language that is used if the CU doesn't declare a
8392 enum language pretend_language;
8395 /* die_reader_func for process_psymtab_comp_unit. */
8398 process_psymtab_comp_unit_reader (const struct die_reader_specs *reader,
8399 const gdb_byte *info_ptr,
8400 struct die_info *comp_unit_die,
8404 struct dwarf2_cu *cu = reader->cu;
8405 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
8406 struct gdbarch *gdbarch = get_objfile_arch (objfile);
8407 struct dwarf2_per_cu_data *per_cu = cu->per_cu;
8409 CORE_ADDR best_lowpc = 0, best_highpc = 0;
8410 struct partial_symtab *pst;
8411 enum pc_bounds_kind cu_bounds_kind;
8412 const char *filename;
8413 struct process_psymtab_comp_unit_data *info
8414 = (struct process_psymtab_comp_unit_data *) data;
8416 if (comp_unit_die->tag == DW_TAG_partial_unit && !info->want_partial_unit)
8419 gdb_assert (! per_cu->is_debug_types);
8421 prepare_one_comp_unit (cu, comp_unit_die, info->pretend_language);
8423 cu->list_in_scope = &file_symbols;
8425 /* Allocate a new partial symbol table structure. */
8426 filename = dwarf2_string_attr (comp_unit_die, DW_AT_name, cu);
8427 if (filename == NULL)
8430 pst = create_partial_symtab (per_cu, filename);
8432 /* This must be done before calling dwarf2_build_include_psymtabs. */
8433 pst->dirname = dwarf2_string_attr (comp_unit_die, DW_AT_comp_dir, cu);
8435 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
8437 dwarf2_find_base_address (comp_unit_die, cu);
8439 /* Possibly set the default values of LOWPC and HIGHPC from
8441 cu_bounds_kind = dwarf2_get_pc_bounds (comp_unit_die, &best_lowpc,
8442 &best_highpc, cu, pst);
8443 if (cu_bounds_kind == PC_BOUNDS_HIGH_LOW && best_lowpc < best_highpc)
8444 /* Store the contiguous range if it is not empty; it can be empty for
8445 CUs with no code. */
8446 addrmap_set_empty (objfile->psymtabs_addrmap,
8447 gdbarch_adjust_dwarf2_addr (gdbarch,
8448 best_lowpc + baseaddr),
8449 gdbarch_adjust_dwarf2_addr (gdbarch,
8450 best_highpc + baseaddr) - 1,
8453 /* Check if comp unit has_children.
8454 If so, read the rest of the partial symbols from this comp unit.
8455 If not, there's no more debug_info for this comp unit. */
8458 struct partial_die_info *first_die;
8459 CORE_ADDR lowpc, highpc;
8461 lowpc = ((CORE_ADDR) -1);
8462 highpc = ((CORE_ADDR) 0);
8464 first_die = load_partial_dies (reader, info_ptr, 1);
8466 scan_partial_symbols (first_die, &lowpc, &highpc,
8467 cu_bounds_kind <= PC_BOUNDS_INVALID, cu);
8469 /* If we didn't find a lowpc, set it to highpc to avoid
8470 complaints from `maint check'. */
8471 if (lowpc == ((CORE_ADDR) -1))
8474 /* If the compilation unit didn't have an explicit address range,
8475 then use the information extracted from its child dies. */
8476 if (cu_bounds_kind <= PC_BOUNDS_INVALID)
8479 best_highpc = highpc;
8482 pst->textlow = gdbarch_adjust_dwarf2_addr (gdbarch, best_lowpc + baseaddr);
8483 pst->texthigh = gdbarch_adjust_dwarf2_addr (gdbarch, best_highpc + baseaddr);
8485 end_psymtab_common (objfile, pst);
8487 if (!VEC_empty (dwarf2_per_cu_ptr, cu->per_cu->imported_symtabs))
8490 int len = VEC_length (dwarf2_per_cu_ptr, cu->per_cu->imported_symtabs);
8491 struct dwarf2_per_cu_data *iter;
8493 /* Fill in 'dependencies' here; we fill in 'users' in a
8495 pst->number_of_dependencies = len;
8497 XOBNEWVEC (&objfile->objfile_obstack, struct partial_symtab *, len);
8499 VEC_iterate (dwarf2_per_cu_ptr, cu->per_cu->imported_symtabs,
8502 pst->dependencies[i] = iter->v.psymtab;
8504 VEC_free (dwarf2_per_cu_ptr, cu->per_cu->imported_symtabs);
8507 /* Get the list of files included in the current compilation unit,
8508 and build a psymtab for each of them. */
8509 dwarf2_build_include_psymtabs (cu, comp_unit_die, pst);
8511 if (dwarf_read_debug)
8513 struct gdbarch *gdbarch = get_objfile_arch (objfile);
8515 fprintf_unfiltered (gdb_stdlog,
8516 "Psymtab for %s unit @%s: %s - %s"
8517 ", %d global, %d static syms\n",
8518 per_cu->is_debug_types ? "type" : "comp",
8519 sect_offset_str (per_cu->sect_off),
8520 paddress (gdbarch, pst->textlow),
8521 paddress (gdbarch, pst->texthigh),
8522 pst->n_global_syms, pst->n_static_syms);
8526 /* Subroutine of dwarf2_build_psymtabs_hard to simplify it.
8527 Process compilation unit THIS_CU for a psymtab. */
8530 process_psymtab_comp_unit (struct dwarf2_per_cu_data *this_cu,
8531 int want_partial_unit,
8532 enum language pretend_language)
8534 /* If this compilation unit was already read in, free the
8535 cached copy in order to read it in again. This is
8536 necessary because we skipped some symbols when we first
8537 read in the compilation unit (see load_partial_dies).
8538 This problem could be avoided, but the benefit is unclear. */
8539 if (this_cu->cu != NULL)
8540 free_one_cached_comp_unit (this_cu);
8542 if (this_cu->is_debug_types)
8543 init_cutu_and_read_dies (this_cu, NULL, 0, 0, build_type_psymtabs_reader,
8547 process_psymtab_comp_unit_data info;
8548 info.want_partial_unit = want_partial_unit;
8549 info.pretend_language = pretend_language;
8550 init_cutu_and_read_dies (this_cu, NULL, 0, 0,
8551 process_psymtab_comp_unit_reader, &info);
8554 /* Age out any secondary CUs. */
8555 age_cached_comp_units (this_cu->dwarf2_per_objfile);
8558 /* Reader function for build_type_psymtabs. */
8561 build_type_psymtabs_reader (const struct die_reader_specs *reader,
8562 const gdb_byte *info_ptr,
8563 struct die_info *type_unit_die,
8567 struct dwarf2_per_objfile *dwarf2_per_objfile
8568 = reader->cu->per_cu->dwarf2_per_objfile;
8569 struct objfile *objfile = dwarf2_per_objfile->objfile;
8570 struct dwarf2_cu *cu = reader->cu;
8571 struct dwarf2_per_cu_data *per_cu = cu->per_cu;
8572 struct signatured_type *sig_type;
8573 struct type_unit_group *tu_group;
8574 struct attribute *attr;
8575 struct partial_die_info *first_die;
8576 CORE_ADDR lowpc, highpc;
8577 struct partial_symtab *pst;
8579 gdb_assert (data == NULL);
8580 gdb_assert (per_cu->is_debug_types);
8581 sig_type = (struct signatured_type *) per_cu;
8586 attr = dwarf2_attr_no_follow (type_unit_die, DW_AT_stmt_list);
8587 tu_group = get_type_unit_group (cu, attr);
8589 VEC_safe_push (sig_type_ptr, tu_group->tus, sig_type);
8591 prepare_one_comp_unit (cu, type_unit_die, language_minimal);
8592 cu->list_in_scope = &file_symbols;
8593 pst = create_partial_symtab (per_cu, "");
8596 first_die = load_partial_dies (reader, info_ptr, 1);
8598 lowpc = (CORE_ADDR) -1;
8599 highpc = (CORE_ADDR) 0;
8600 scan_partial_symbols (first_die, &lowpc, &highpc, 0, cu);
8602 end_psymtab_common (objfile, pst);
8605 /* Struct used to sort TUs by their abbreviation table offset. */
8607 struct tu_abbrev_offset
8609 struct signatured_type *sig_type;
8610 sect_offset abbrev_offset;
8613 /* Helper routine for build_type_psymtabs_1, passed to qsort. */
8616 sort_tu_by_abbrev_offset (const void *ap, const void *bp)
8618 const struct tu_abbrev_offset * const *a
8619 = (const struct tu_abbrev_offset * const*) ap;
8620 const struct tu_abbrev_offset * const *b
8621 = (const struct tu_abbrev_offset * const*) bp;
8622 sect_offset aoff = (*a)->abbrev_offset;
8623 sect_offset boff = (*b)->abbrev_offset;
8625 return (aoff > boff) - (aoff < boff);
8628 /* Efficiently read all the type units.
8629 This does the bulk of the work for build_type_psymtabs.
8631 The efficiency is because we sort TUs by the abbrev table they use and
8632 only read each abbrev table once. In one program there are 200K TUs
8633 sharing 8K abbrev tables.
8635 The main purpose of this function is to support building the
8636 dwarf2_per_objfile->type_unit_groups table.
8637 TUs typically share the DW_AT_stmt_list of the CU they came from, so we
8638 can collapse the search space by grouping them by stmt_list.
8639 The savings can be significant, in the same program from above the 200K TUs
8640 share 8K stmt_list tables.
8642 FUNC is expected to call get_type_unit_group, which will create the
8643 struct type_unit_group if necessary and add it to
8644 dwarf2_per_objfile->type_unit_groups. */
8647 build_type_psymtabs_1 (struct dwarf2_per_objfile *dwarf2_per_objfile)
8649 struct tu_stats *tu_stats = &dwarf2_per_objfile->tu_stats;
8650 struct cleanup *cleanups;
8651 abbrev_table_up abbrev_table;
8652 sect_offset abbrev_offset;
8653 struct tu_abbrev_offset *sorted_by_abbrev;
8656 /* It's up to the caller to not call us multiple times. */
8657 gdb_assert (dwarf2_per_objfile->type_unit_groups == NULL);
8659 if (dwarf2_per_objfile->n_type_units == 0)
8662 /* TUs typically share abbrev tables, and there can be way more TUs than
8663 abbrev tables. Sort by abbrev table to reduce the number of times we
8664 read each abbrev table in.
8665 Alternatives are to punt or to maintain a cache of abbrev tables.
8666 This is simpler and efficient enough for now.
8668 Later we group TUs by their DW_AT_stmt_list value (as this defines the
8669 symtab to use). Typically TUs with the same abbrev offset have the same
8670 stmt_list value too so in practice this should work well.
8672 The basic algorithm here is:
8674 sort TUs by abbrev table
8675 for each TU with same abbrev table:
8676 read abbrev table if first user
8677 read TU top level DIE
8678 [IWBN if DWO skeletons had DW_AT_stmt_list]
8681 if (dwarf_read_debug)
8682 fprintf_unfiltered (gdb_stdlog, "Building type unit groups ...\n");
8684 /* Sort in a separate table to maintain the order of all_type_units
8685 for .gdb_index: TU indices directly index all_type_units. */
8686 sorted_by_abbrev = XNEWVEC (struct tu_abbrev_offset,
8687 dwarf2_per_objfile->n_type_units);
8688 for (i = 0; i < dwarf2_per_objfile->n_type_units; ++i)
8690 struct signatured_type *sig_type = dwarf2_per_objfile->all_type_units[i];
8692 sorted_by_abbrev[i].sig_type = sig_type;
8693 sorted_by_abbrev[i].abbrev_offset =
8694 read_abbrev_offset (dwarf2_per_objfile,
8695 sig_type->per_cu.section,
8696 sig_type->per_cu.sect_off);
8698 cleanups = make_cleanup (xfree, sorted_by_abbrev);
8699 qsort (sorted_by_abbrev, dwarf2_per_objfile->n_type_units,
8700 sizeof (struct tu_abbrev_offset), sort_tu_by_abbrev_offset);
8702 abbrev_offset = (sect_offset) ~(unsigned) 0;
8704 for (i = 0; i < dwarf2_per_objfile->n_type_units; ++i)
8706 const struct tu_abbrev_offset *tu = &sorted_by_abbrev[i];
8708 /* Switch to the next abbrev table if necessary. */
8709 if (abbrev_table == NULL
8710 || tu->abbrev_offset != abbrev_offset)
8712 abbrev_offset = tu->abbrev_offset;
8714 abbrev_table_read_table (dwarf2_per_objfile,
8715 &dwarf2_per_objfile->abbrev,
8717 ++tu_stats->nr_uniq_abbrev_tables;
8720 init_cutu_and_read_dies (&tu->sig_type->per_cu, abbrev_table.get (),
8721 0, 0, build_type_psymtabs_reader, NULL);
8724 do_cleanups (cleanups);
8727 /* Print collected type unit statistics. */
8730 print_tu_stats (struct dwarf2_per_objfile *dwarf2_per_objfile)
8732 struct tu_stats *tu_stats = &dwarf2_per_objfile->tu_stats;
8734 fprintf_unfiltered (gdb_stdlog, "Type unit statistics:\n");
8735 fprintf_unfiltered (gdb_stdlog, " %d TUs\n",
8736 dwarf2_per_objfile->n_type_units);
8737 fprintf_unfiltered (gdb_stdlog, " %d uniq abbrev tables\n",
8738 tu_stats->nr_uniq_abbrev_tables);
8739 fprintf_unfiltered (gdb_stdlog, " %d symtabs from stmt_list entries\n",
8740 tu_stats->nr_symtabs);
8741 fprintf_unfiltered (gdb_stdlog, " %d symtab sharers\n",
8742 tu_stats->nr_symtab_sharers);
8743 fprintf_unfiltered (gdb_stdlog, " %d type units without a stmt_list\n",
8744 tu_stats->nr_stmt_less_type_units);
8745 fprintf_unfiltered (gdb_stdlog, " %d all_type_units reallocs\n",
8746 tu_stats->nr_all_type_units_reallocs);
8749 /* Traversal function for build_type_psymtabs. */
8752 build_type_psymtab_dependencies (void **slot, void *info)
8754 struct dwarf2_per_objfile *dwarf2_per_objfile
8755 = (struct dwarf2_per_objfile *) info;
8756 struct objfile *objfile = dwarf2_per_objfile->objfile;
8757 struct type_unit_group *tu_group = (struct type_unit_group *) *slot;
8758 struct dwarf2_per_cu_data *per_cu = &tu_group->per_cu;
8759 struct partial_symtab *pst = per_cu->v.psymtab;
8760 int len = VEC_length (sig_type_ptr, tu_group->tus);
8761 struct signatured_type *iter;
8764 gdb_assert (len > 0);
8765 gdb_assert (IS_TYPE_UNIT_GROUP (per_cu));
8767 pst->number_of_dependencies = len;
8769 XOBNEWVEC (&objfile->objfile_obstack, struct partial_symtab *, len);
8771 VEC_iterate (sig_type_ptr, tu_group->tus, i, iter);
8774 gdb_assert (iter->per_cu.is_debug_types);
8775 pst->dependencies[i] = iter->per_cu.v.psymtab;
8776 iter->type_unit_group = tu_group;
8779 VEC_free (sig_type_ptr, tu_group->tus);
8784 /* Subroutine of dwarf2_build_psymtabs_hard to simplify it.
8785 Build partial symbol tables for the .debug_types comp-units. */
8788 build_type_psymtabs (struct dwarf2_per_objfile *dwarf2_per_objfile)
8790 if (! create_all_type_units (dwarf2_per_objfile))
8793 build_type_psymtabs_1 (dwarf2_per_objfile);
8796 /* Traversal function for process_skeletonless_type_unit.
8797 Read a TU in a DWO file and build partial symbols for it. */
8800 process_skeletonless_type_unit (void **slot, void *info)
8802 struct dwo_unit *dwo_unit = (struct dwo_unit *) *slot;
8803 struct dwarf2_per_objfile *dwarf2_per_objfile
8804 = (struct dwarf2_per_objfile *) info;
8805 struct signatured_type find_entry, *entry;
8807 /* If this TU doesn't exist in the global table, add it and read it in. */
8809 if (dwarf2_per_objfile->signatured_types == NULL)
8811 dwarf2_per_objfile->signatured_types
8812 = allocate_signatured_type_table (dwarf2_per_objfile->objfile);
8815 find_entry.signature = dwo_unit->signature;
8816 slot = htab_find_slot (dwarf2_per_objfile->signatured_types, &find_entry,
8818 /* If we've already seen this type there's nothing to do. What's happening
8819 is we're doing our own version of comdat-folding here. */
8823 /* This does the job that create_all_type_units would have done for
8825 entry = add_type_unit (dwarf2_per_objfile, dwo_unit->signature, slot);
8826 fill_in_sig_entry_from_dwo_entry (dwarf2_per_objfile, entry, dwo_unit);
8829 /* This does the job that build_type_psymtabs_1 would have done. */
8830 init_cutu_and_read_dies (&entry->per_cu, NULL, 0, 0,
8831 build_type_psymtabs_reader, NULL);
8836 /* Traversal function for process_skeletonless_type_units. */
8839 process_dwo_file_for_skeletonless_type_units (void **slot, void *info)
8841 struct dwo_file *dwo_file = (struct dwo_file *) *slot;
8843 if (dwo_file->tus != NULL)
8845 htab_traverse_noresize (dwo_file->tus,
8846 process_skeletonless_type_unit, info);
8852 /* Scan all TUs of DWO files, verifying we've processed them.
8853 This is needed in case a TU was emitted without its skeleton.
8854 Note: This can't be done until we know what all the DWO files are. */
8857 process_skeletonless_type_units (struct dwarf2_per_objfile *dwarf2_per_objfile)
8859 /* Skeletonless TUs in DWP files without .gdb_index is not supported yet. */
8860 if (get_dwp_file (dwarf2_per_objfile) == NULL
8861 && dwarf2_per_objfile->dwo_files != NULL)
8863 htab_traverse_noresize (dwarf2_per_objfile->dwo_files,
8864 process_dwo_file_for_skeletonless_type_units,
8865 dwarf2_per_objfile);
8869 /* Compute the 'user' field for each psymtab in DWARF2_PER_OBJFILE. */
8872 set_partial_user (struct dwarf2_per_objfile *dwarf2_per_objfile)
8876 for (i = 0; i < dwarf2_per_objfile->n_comp_units; ++i)
8878 struct dwarf2_per_cu_data *per_cu = dw2_get_cutu (dwarf2_per_objfile, i);
8879 struct partial_symtab *pst = per_cu->v.psymtab;
8885 for (j = 0; j < pst->number_of_dependencies; ++j)
8887 /* Set the 'user' field only if it is not already set. */
8888 if (pst->dependencies[j]->user == NULL)
8889 pst->dependencies[j]->user = pst;
8894 /* Build the partial symbol table by doing a quick pass through the
8895 .debug_info and .debug_abbrev sections. */
8898 dwarf2_build_psymtabs_hard (struct dwarf2_per_objfile *dwarf2_per_objfile)
8900 struct cleanup *back_to;
8902 struct objfile *objfile = dwarf2_per_objfile->objfile;
8904 if (dwarf_read_debug)
8906 fprintf_unfiltered (gdb_stdlog, "Building psymtabs of objfile %s ...\n",
8907 objfile_name (objfile));
8910 dwarf2_per_objfile->reading_partial_symbols = 1;
8912 dwarf2_read_section (objfile, &dwarf2_per_objfile->info);
8914 /* Any cached compilation units will be linked by the per-objfile
8915 read_in_chain. Make sure to free them when we're done. */
8916 back_to = make_cleanup (free_cached_comp_units, dwarf2_per_objfile);
8918 build_type_psymtabs (dwarf2_per_objfile);
8920 create_all_comp_units (dwarf2_per_objfile);
8922 /* Create a temporary address map on a temporary obstack. We later
8923 copy this to the final obstack. */
8924 auto_obstack temp_obstack;
8926 scoped_restore save_psymtabs_addrmap
8927 = make_scoped_restore (&objfile->psymtabs_addrmap,
8928 addrmap_create_mutable (&temp_obstack));
8930 for (i = 0; i < dwarf2_per_objfile->n_comp_units; ++i)
8932 struct dwarf2_per_cu_data *per_cu = dw2_get_cutu (dwarf2_per_objfile, i);
8934 process_psymtab_comp_unit (per_cu, 0, language_minimal);
8937 /* This has to wait until we read the CUs, we need the list of DWOs. */
8938 process_skeletonless_type_units (dwarf2_per_objfile);
8940 /* Now that all TUs have been processed we can fill in the dependencies. */
8941 if (dwarf2_per_objfile->type_unit_groups != NULL)
8943 htab_traverse_noresize (dwarf2_per_objfile->type_unit_groups,
8944 build_type_psymtab_dependencies, dwarf2_per_objfile);
8947 if (dwarf_read_debug)
8948 print_tu_stats (dwarf2_per_objfile);
8950 set_partial_user (dwarf2_per_objfile);
8952 objfile->psymtabs_addrmap = addrmap_create_fixed (objfile->psymtabs_addrmap,
8953 &objfile->objfile_obstack);
8954 /* At this point we want to keep the address map. */
8955 save_psymtabs_addrmap.release ();
8957 do_cleanups (back_to);
8959 if (dwarf_read_debug)
8960 fprintf_unfiltered (gdb_stdlog, "Done building psymtabs of %s\n",
8961 objfile_name (objfile));
8964 /* die_reader_func for load_partial_comp_unit. */
8967 load_partial_comp_unit_reader (const struct die_reader_specs *reader,
8968 const gdb_byte *info_ptr,
8969 struct die_info *comp_unit_die,
8973 struct dwarf2_cu *cu = reader->cu;
8975 prepare_one_comp_unit (cu, comp_unit_die, language_minimal);
8977 /* Check if comp unit has_children.
8978 If so, read the rest of the partial symbols from this comp unit.
8979 If not, there's no more debug_info for this comp unit. */
8981 load_partial_dies (reader, info_ptr, 0);
8984 /* Load the partial DIEs for a secondary CU into memory.
8985 This is also used when rereading a primary CU with load_all_dies. */
8988 load_partial_comp_unit (struct dwarf2_per_cu_data *this_cu)
8990 init_cutu_and_read_dies (this_cu, NULL, 1, 1,
8991 load_partial_comp_unit_reader, NULL);
8995 read_comp_units_from_section (struct dwarf2_per_objfile *dwarf2_per_objfile,
8996 struct dwarf2_section_info *section,
8997 struct dwarf2_section_info *abbrev_section,
8998 unsigned int is_dwz,
9001 struct dwarf2_per_cu_data ***all_comp_units)
9003 const gdb_byte *info_ptr;
9004 struct objfile *objfile = dwarf2_per_objfile->objfile;
9006 if (dwarf_read_debug)
9007 fprintf_unfiltered (gdb_stdlog, "Reading %s for %s\n",
9008 get_section_name (section),
9009 get_section_file_name (section));
9011 dwarf2_read_section (objfile, section);
9013 info_ptr = section->buffer;
9015 while (info_ptr < section->buffer + section->size)
9017 struct dwarf2_per_cu_data *this_cu;
9019 sect_offset sect_off = (sect_offset) (info_ptr - section->buffer);
9021 comp_unit_head cu_header;
9022 read_and_check_comp_unit_head (dwarf2_per_objfile, &cu_header, section,
9023 abbrev_section, info_ptr,
9024 rcuh_kind::COMPILE);
9026 /* Save the compilation unit for later lookup. */
9027 if (cu_header.unit_type != DW_UT_type)
9029 this_cu = XOBNEW (&objfile->objfile_obstack,
9030 struct dwarf2_per_cu_data);
9031 memset (this_cu, 0, sizeof (*this_cu));
9035 auto sig_type = XOBNEW (&objfile->objfile_obstack,
9036 struct signatured_type);
9037 memset (sig_type, 0, sizeof (*sig_type));
9038 sig_type->signature = cu_header.signature;
9039 sig_type->type_offset_in_tu = cu_header.type_cu_offset_in_tu;
9040 this_cu = &sig_type->per_cu;
9042 this_cu->is_debug_types = (cu_header.unit_type == DW_UT_type);
9043 this_cu->sect_off = sect_off;
9044 this_cu->length = cu_header.length + cu_header.initial_length_size;
9045 this_cu->is_dwz = is_dwz;
9046 this_cu->dwarf2_per_objfile = dwarf2_per_objfile;
9047 this_cu->section = section;
9049 if (*n_comp_units == *n_allocated)
9052 *all_comp_units = XRESIZEVEC (struct dwarf2_per_cu_data *,
9053 *all_comp_units, *n_allocated);
9055 (*all_comp_units)[*n_comp_units] = this_cu;
9058 info_ptr = info_ptr + this_cu->length;
9062 /* Create a list of all compilation units in OBJFILE.
9063 This is only done for -readnow and building partial symtabs. */
9066 create_all_comp_units (struct dwarf2_per_objfile *dwarf2_per_objfile)
9070 struct dwarf2_per_cu_data **all_comp_units;
9071 struct dwz_file *dwz;
9072 struct objfile *objfile = dwarf2_per_objfile->objfile;
9076 all_comp_units = XNEWVEC (struct dwarf2_per_cu_data *, n_allocated);
9078 read_comp_units_from_section (dwarf2_per_objfile, &dwarf2_per_objfile->info,
9079 &dwarf2_per_objfile->abbrev, 0,
9080 &n_allocated, &n_comp_units, &all_comp_units);
9082 dwz = dwarf2_get_dwz_file (dwarf2_per_objfile);
9084 read_comp_units_from_section (dwarf2_per_objfile, &dwz->info, &dwz->abbrev,
9085 1, &n_allocated, &n_comp_units,
9088 dwarf2_per_objfile->all_comp_units = XOBNEWVEC (&objfile->objfile_obstack,
9089 struct dwarf2_per_cu_data *,
9091 memcpy (dwarf2_per_objfile->all_comp_units, all_comp_units,
9092 n_comp_units * sizeof (struct dwarf2_per_cu_data *));
9093 xfree (all_comp_units);
9094 dwarf2_per_objfile->n_comp_units = n_comp_units;
9097 /* Process all loaded DIEs for compilation unit CU, starting at
9098 FIRST_DIE. The caller should pass SET_ADDRMAP == 1 if the compilation
9099 unit DIE did not have PC info (DW_AT_low_pc and DW_AT_high_pc, or
9100 DW_AT_ranges). See the comments of add_partial_subprogram on how
9101 SET_ADDRMAP is used and how *LOWPC and *HIGHPC are updated. */
9104 scan_partial_symbols (struct partial_die_info *first_die, CORE_ADDR *lowpc,
9105 CORE_ADDR *highpc, int set_addrmap,
9106 struct dwarf2_cu *cu)
9108 struct partial_die_info *pdi;
9110 /* Now, march along the PDI's, descending into ones which have
9111 interesting children but skipping the children of the other ones,
9112 until we reach the end of the compilation unit. */
9120 /* Anonymous namespaces or modules have no name but have interesting
9121 children, so we need to look at them. Ditto for anonymous
9124 if (pdi->name != NULL || pdi->tag == DW_TAG_namespace
9125 || pdi->tag == DW_TAG_module || pdi->tag == DW_TAG_enumeration_type
9126 || pdi->tag == DW_TAG_imported_unit
9127 || pdi->tag == DW_TAG_inlined_subroutine)
9131 case DW_TAG_subprogram:
9132 case DW_TAG_inlined_subroutine:
9133 add_partial_subprogram (pdi, lowpc, highpc, set_addrmap, cu);
9135 case DW_TAG_constant:
9136 case DW_TAG_variable:
9137 case DW_TAG_typedef:
9138 case DW_TAG_union_type:
9139 if (!pdi->is_declaration)
9141 add_partial_symbol (pdi, cu);
9144 case DW_TAG_class_type:
9145 case DW_TAG_interface_type:
9146 case DW_TAG_structure_type:
9147 if (!pdi->is_declaration)
9149 add_partial_symbol (pdi, cu);
9151 if (cu->language == language_rust && pdi->has_children)
9152 scan_partial_symbols (pdi->die_child, lowpc, highpc,
9155 case DW_TAG_enumeration_type:
9156 if (!pdi->is_declaration)
9157 add_partial_enumeration (pdi, cu);
9159 case DW_TAG_base_type:
9160 case DW_TAG_subrange_type:
9161 /* File scope base type definitions are added to the partial
9163 add_partial_symbol (pdi, cu);
9165 case DW_TAG_namespace:
9166 add_partial_namespace (pdi, lowpc, highpc, set_addrmap, cu);
9169 add_partial_module (pdi, lowpc, highpc, set_addrmap, cu);
9171 case DW_TAG_imported_unit:
9173 struct dwarf2_per_cu_data *per_cu;
9175 /* For now we don't handle imported units in type units. */
9176 if (cu->per_cu->is_debug_types)
9178 error (_("Dwarf Error: DW_TAG_imported_unit is not"
9179 " supported in type units [in module %s]"),
9180 objfile_name (cu->per_cu->dwarf2_per_objfile->objfile));
9183 per_cu = dwarf2_find_containing_comp_unit
9184 (pdi->d.sect_off, pdi->is_dwz,
9185 cu->per_cu->dwarf2_per_objfile);
9187 /* Go read the partial unit, if needed. */
9188 if (per_cu->v.psymtab == NULL)
9189 process_psymtab_comp_unit (per_cu, 1, cu->language);
9191 VEC_safe_push (dwarf2_per_cu_ptr,
9192 cu->per_cu->imported_symtabs, per_cu);
9195 case DW_TAG_imported_declaration:
9196 add_partial_symbol (pdi, cu);
9203 /* If the die has a sibling, skip to the sibling. */
9205 pdi = pdi->die_sibling;
9209 /* Functions used to compute the fully scoped name of a partial DIE.
9211 Normally, this is simple. For C++, the parent DIE's fully scoped
9212 name is concatenated with "::" and the partial DIE's name.
9213 Enumerators are an exception; they use the scope of their parent
9214 enumeration type, i.e. the name of the enumeration type is not
9215 prepended to the enumerator.
9217 There are two complexities. One is DW_AT_specification; in this
9218 case "parent" means the parent of the target of the specification,
9219 instead of the direct parent of the DIE. The other is compilers
9220 which do not emit DW_TAG_namespace; in this case we try to guess
9221 the fully qualified name of structure types from their members'
9222 linkage names. This must be done using the DIE's children rather
9223 than the children of any DW_AT_specification target. We only need
9224 to do this for structures at the top level, i.e. if the target of
9225 any DW_AT_specification (if any; otherwise the DIE itself) does not
9228 /* Compute the scope prefix associated with PDI's parent, in
9229 compilation unit CU. The result will be allocated on CU's
9230 comp_unit_obstack, or a copy of the already allocated PDI->NAME
9231 field. NULL is returned if no prefix is necessary. */
9233 partial_die_parent_scope (struct partial_die_info *pdi,
9234 struct dwarf2_cu *cu)
9236 const char *grandparent_scope;
9237 struct partial_die_info *parent, *real_pdi;
9239 /* We need to look at our parent DIE; if we have a DW_AT_specification,
9240 then this means the parent of the specification DIE. */
9243 while (real_pdi->has_specification)
9244 real_pdi = find_partial_die (real_pdi->spec_offset,
9245 real_pdi->spec_is_dwz, cu);
9247 parent = real_pdi->die_parent;
9251 if (parent->scope_set)
9252 return parent->scope;
9256 grandparent_scope = partial_die_parent_scope (parent, cu);
9258 /* GCC 4.0 and 4.1 had a bug (PR c++/28460) where they generated bogus
9259 DW_TAG_namespace DIEs with a name of "::" for the global namespace.
9260 Work around this problem here. */
9261 if (cu->language == language_cplus
9262 && parent->tag == DW_TAG_namespace
9263 && strcmp (parent->name, "::") == 0
9264 && grandparent_scope == NULL)
9266 parent->scope = NULL;
9267 parent->scope_set = 1;
9271 if (pdi->tag == DW_TAG_enumerator)
9272 /* Enumerators should not get the name of the enumeration as a prefix. */
9273 parent->scope = grandparent_scope;
9274 else if (parent->tag == DW_TAG_namespace
9275 || parent->tag == DW_TAG_module
9276 || parent->tag == DW_TAG_structure_type
9277 || parent->tag == DW_TAG_class_type
9278 || parent->tag == DW_TAG_interface_type
9279 || parent->tag == DW_TAG_union_type
9280 || parent->tag == DW_TAG_enumeration_type)
9282 if (grandparent_scope == NULL)
9283 parent->scope = parent->name;
9285 parent->scope = typename_concat (&cu->comp_unit_obstack,
9287 parent->name, 0, cu);
9291 /* FIXME drow/2004-04-01: What should we be doing with
9292 function-local names? For partial symbols, we should probably be
9294 complaint (&symfile_complaints,
9295 _("unhandled containing DIE tag %d for DIE at %s"),
9296 parent->tag, sect_offset_str (pdi->sect_off));
9297 parent->scope = grandparent_scope;
9300 parent->scope_set = 1;
9301 return parent->scope;
9304 /* Return the fully scoped name associated with PDI, from compilation unit
9305 CU. The result will be allocated with malloc. */
9308 partial_die_full_name (struct partial_die_info *pdi,
9309 struct dwarf2_cu *cu)
9311 const char *parent_scope;
9313 /* If this is a template instantiation, we can not work out the
9314 template arguments from partial DIEs. So, unfortunately, we have
9315 to go through the full DIEs. At least any work we do building
9316 types here will be reused if full symbols are loaded later. */
9317 if (pdi->has_template_arguments)
9321 if (pdi->name != NULL && strchr (pdi->name, '<') == NULL)
9323 struct die_info *die;
9324 struct attribute attr;
9325 struct dwarf2_cu *ref_cu = cu;
9327 /* DW_FORM_ref_addr is using section offset. */
9328 attr.name = (enum dwarf_attribute) 0;
9329 attr.form = DW_FORM_ref_addr;
9330 attr.u.unsnd = to_underlying (pdi->sect_off);
9331 die = follow_die_ref (NULL, &attr, &ref_cu);
9333 return xstrdup (dwarf2_full_name (NULL, die, ref_cu));
9337 parent_scope = partial_die_parent_scope (pdi, cu);
9338 if (parent_scope == NULL)
9341 return typename_concat (NULL, parent_scope, pdi->name, 0, cu);
9345 add_partial_symbol (struct partial_die_info *pdi, struct dwarf2_cu *cu)
9347 struct dwarf2_per_objfile *dwarf2_per_objfile
9348 = cu->per_cu->dwarf2_per_objfile;
9349 struct objfile *objfile = dwarf2_per_objfile->objfile;
9350 struct gdbarch *gdbarch = get_objfile_arch (objfile);
9352 const char *actual_name = NULL;
9354 char *built_actual_name;
9356 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
9358 built_actual_name = partial_die_full_name (pdi, cu);
9359 if (built_actual_name != NULL)
9360 actual_name = built_actual_name;
9362 if (actual_name == NULL)
9363 actual_name = pdi->name;
9367 case DW_TAG_inlined_subroutine:
9368 case DW_TAG_subprogram:
9369 addr = gdbarch_adjust_dwarf2_addr (gdbarch, pdi->lowpc + baseaddr);
9370 if (pdi->is_external || cu->language == language_ada)
9372 /* brobecker/2007-12-26: Normally, only "external" DIEs are part
9373 of the global scope. But in Ada, we want to be able to access
9374 nested procedures globally. So all Ada subprograms are stored
9375 in the global scope. */
9376 add_psymbol_to_list (actual_name, strlen (actual_name),
9377 built_actual_name != NULL,
9378 VAR_DOMAIN, LOC_BLOCK,
9379 &objfile->global_psymbols,
9380 addr, cu->language, objfile);
9384 add_psymbol_to_list (actual_name, strlen (actual_name),
9385 built_actual_name != NULL,
9386 VAR_DOMAIN, LOC_BLOCK,
9387 &objfile->static_psymbols,
9388 addr, cu->language, objfile);
9391 if (pdi->main_subprogram && actual_name != NULL)
9392 set_objfile_main_name (objfile, actual_name, cu->language);
9394 case DW_TAG_constant:
9396 std::vector<partial_symbol *> *list;
9398 if (pdi->is_external)
9399 list = &objfile->global_psymbols;
9401 list = &objfile->static_psymbols;
9402 add_psymbol_to_list (actual_name, strlen (actual_name),
9403 built_actual_name != NULL, VAR_DOMAIN, LOC_STATIC,
9404 list, 0, cu->language, objfile);
9407 case DW_TAG_variable:
9409 addr = decode_locdesc (pdi->d.locdesc, cu);
9413 && !dwarf2_per_objfile->has_section_at_zero)
9415 /* A global or static variable may also have been stripped
9416 out by the linker if unused, in which case its address
9417 will be nullified; do not add such variables into partial
9418 symbol table then. */
9420 else if (pdi->is_external)
9423 Don't enter into the minimal symbol tables as there is
9424 a minimal symbol table entry from the ELF symbols already.
9425 Enter into partial symbol table if it has a location
9426 descriptor or a type.
9427 If the location descriptor is missing, new_symbol will create
9428 a LOC_UNRESOLVED symbol, the address of the variable will then
9429 be determined from the minimal symbol table whenever the variable
9431 The address for the partial symbol table entry is not
9432 used by GDB, but it comes in handy for debugging partial symbol
9435 if (pdi->d.locdesc || pdi->has_type)
9436 add_psymbol_to_list (actual_name, strlen (actual_name),
9437 built_actual_name != NULL,
9438 VAR_DOMAIN, LOC_STATIC,
9439 &objfile->global_psymbols,
9441 cu->language, objfile);
9445 int has_loc = pdi->d.locdesc != NULL;
9447 /* Static Variable. Skip symbols whose value we cannot know (those
9448 without location descriptors or constant values). */
9449 if (!has_loc && !pdi->has_const_value)
9451 xfree (built_actual_name);
9455 add_psymbol_to_list (actual_name, strlen (actual_name),
9456 built_actual_name != NULL,
9457 VAR_DOMAIN, LOC_STATIC,
9458 &objfile->static_psymbols,
9459 has_loc ? addr + baseaddr : (CORE_ADDR) 0,
9460 cu->language, objfile);
9463 case DW_TAG_typedef:
9464 case DW_TAG_base_type:
9465 case DW_TAG_subrange_type:
9466 add_psymbol_to_list (actual_name, strlen (actual_name),
9467 built_actual_name != NULL,
9468 VAR_DOMAIN, LOC_TYPEDEF,
9469 &objfile->static_psymbols,
9470 0, cu->language, objfile);
9472 case DW_TAG_imported_declaration:
9473 case DW_TAG_namespace:
9474 add_psymbol_to_list (actual_name, strlen (actual_name),
9475 built_actual_name != NULL,
9476 VAR_DOMAIN, LOC_TYPEDEF,
9477 &objfile->global_psymbols,
9478 0, cu->language, objfile);
9481 add_psymbol_to_list (actual_name, strlen (actual_name),
9482 built_actual_name != NULL,
9483 MODULE_DOMAIN, LOC_TYPEDEF,
9484 &objfile->global_psymbols,
9485 0, cu->language, objfile);
9487 case DW_TAG_class_type:
9488 case DW_TAG_interface_type:
9489 case DW_TAG_structure_type:
9490 case DW_TAG_union_type:
9491 case DW_TAG_enumeration_type:
9492 /* Skip external references. The DWARF standard says in the section
9493 about "Structure, Union, and Class Type Entries": "An incomplete
9494 structure, union or class type is represented by a structure,
9495 union or class entry that does not have a byte size attribute
9496 and that has a DW_AT_declaration attribute." */
9497 if (!pdi->has_byte_size && pdi->is_declaration)
9499 xfree (built_actual_name);
9503 /* NOTE: carlton/2003-10-07: See comment in new_symbol about
9504 static vs. global. */
9505 add_psymbol_to_list (actual_name, strlen (actual_name),
9506 built_actual_name != NULL,
9507 STRUCT_DOMAIN, LOC_TYPEDEF,
9508 cu->language == language_cplus
9509 ? &objfile->global_psymbols
9510 : &objfile->static_psymbols,
9511 0, cu->language, objfile);
9514 case DW_TAG_enumerator:
9515 add_psymbol_to_list (actual_name, strlen (actual_name),
9516 built_actual_name != NULL,
9517 VAR_DOMAIN, LOC_CONST,
9518 cu->language == language_cplus
9519 ? &objfile->global_psymbols
9520 : &objfile->static_psymbols,
9521 0, cu->language, objfile);
9527 xfree (built_actual_name);
9530 /* Read a partial die corresponding to a namespace; also, add a symbol
9531 corresponding to that namespace to the symbol table. NAMESPACE is
9532 the name of the enclosing namespace. */
9535 add_partial_namespace (struct partial_die_info *pdi,
9536 CORE_ADDR *lowpc, CORE_ADDR *highpc,
9537 int set_addrmap, struct dwarf2_cu *cu)
9539 /* Add a symbol for the namespace. */
9541 add_partial_symbol (pdi, cu);
9543 /* Now scan partial symbols in that namespace. */
9545 if (pdi->has_children)
9546 scan_partial_symbols (pdi->die_child, lowpc, highpc, set_addrmap, cu);
9549 /* Read a partial die corresponding to a Fortran module. */
9552 add_partial_module (struct partial_die_info *pdi, CORE_ADDR *lowpc,
9553 CORE_ADDR *highpc, int set_addrmap, struct dwarf2_cu *cu)
9555 /* Add a symbol for the namespace. */
9557 add_partial_symbol (pdi, cu);
9559 /* Now scan partial symbols in that module. */
9561 if (pdi->has_children)
9562 scan_partial_symbols (pdi->die_child, lowpc, highpc, set_addrmap, cu);
9565 /* Read a partial die corresponding to a subprogram or an inlined
9566 subprogram and create a partial symbol for that subprogram.
9567 When the CU language allows it, this routine also defines a partial
9568 symbol for each nested subprogram that this subprogram contains.
9569 If SET_ADDRMAP is true, record the covered ranges in the addrmap.
9570 Set *LOWPC and *HIGHPC to the lowest and highest PC values found in PDI.
9572 PDI may also be a lexical block, in which case we simply search
9573 recursively for subprograms defined inside that lexical block.
9574 Again, this is only performed when the CU language allows this
9575 type of definitions. */
9578 add_partial_subprogram (struct partial_die_info *pdi,
9579 CORE_ADDR *lowpc, CORE_ADDR *highpc,
9580 int set_addrmap, struct dwarf2_cu *cu)
9582 if (pdi->tag == DW_TAG_subprogram || pdi->tag == DW_TAG_inlined_subroutine)
9584 if (pdi->has_pc_info)
9586 if (pdi->lowpc < *lowpc)
9587 *lowpc = pdi->lowpc;
9588 if (pdi->highpc > *highpc)
9589 *highpc = pdi->highpc;
9592 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
9593 struct gdbarch *gdbarch = get_objfile_arch (objfile);
9598 baseaddr = ANOFFSET (objfile->section_offsets,
9599 SECT_OFF_TEXT (objfile));
9600 lowpc = gdbarch_adjust_dwarf2_addr (gdbarch,
9601 pdi->lowpc + baseaddr);
9602 highpc = gdbarch_adjust_dwarf2_addr (gdbarch,
9603 pdi->highpc + baseaddr);
9604 addrmap_set_empty (objfile->psymtabs_addrmap, lowpc, highpc - 1,
9605 cu->per_cu->v.psymtab);
9609 if (pdi->has_pc_info || (!pdi->is_external && pdi->may_be_inlined))
9611 if (!pdi->is_declaration)
9612 /* Ignore subprogram DIEs that do not have a name, they are
9613 illegal. Do not emit a complaint at this point, we will
9614 do so when we convert this psymtab into a symtab. */
9616 add_partial_symbol (pdi, cu);
9620 if (! pdi->has_children)
9623 if (cu->language == language_ada)
9625 pdi = pdi->die_child;
9629 if (pdi->tag == DW_TAG_subprogram
9630 || pdi->tag == DW_TAG_inlined_subroutine
9631 || pdi->tag == DW_TAG_lexical_block)
9632 add_partial_subprogram (pdi, lowpc, highpc, set_addrmap, cu);
9633 pdi = pdi->die_sibling;
9638 /* Read a partial die corresponding to an enumeration type. */
9641 add_partial_enumeration (struct partial_die_info *enum_pdi,
9642 struct dwarf2_cu *cu)
9644 struct partial_die_info *pdi;
9646 if (enum_pdi->name != NULL)
9647 add_partial_symbol (enum_pdi, cu);
9649 pdi = enum_pdi->die_child;
9652 if (pdi->tag != DW_TAG_enumerator || pdi->name == NULL)
9653 complaint (&symfile_complaints, _("malformed enumerator DIE ignored"));
9655 add_partial_symbol (pdi, cu);
9656 pdi = pdi->die_sibling;
9660 /* Return the initial uleb128 in the die at INFO_PTR. */
9663 peek_abbrev_code (bfd *abfd, const gdb_byte *info_ptr)
9665 unsigned int bytes_read;
9667 return read_unsigned_leb128 (abfd, info_ptr, &bytes_read);
9670 /* Read the initial uleb128 in the die at INFO_PTR in compilation unit
9671 READER::CU. Use READER::ABBREV_TABLE to lookup any abbreviation.
9673 Return the corresponding abbrev, or NULL if the number is zero (indicating
9674 an empty DIE). In either case *BYTES_READ will be set to the length of
9675 the initial number. */
9677 static struct abbrev_info *
9678 peek_die_abbrev (const die_reader_specs &reader,
9679 const gdb_byte *info_ptr, unsigned int *bytes_read)
9681 dwarf2_cu *cu = reader.cu;
9682 bfd *abfd = cu->per_cu->dwarf2_per_objfile->objfile->obfd;
9683 unsigned int abbrev_number
9684 = read_unsigned_leb128 (abfd, info_ptr, bytes_read);
9686 if (abbrev_number == 0)
9689 abbrev_info *abbrev = reader.abbrev_table->lookup_abbrev (abbrev_number);
9692 error (_("Dwarf Error: Could not find abbrev number %d in %s"
9693 " at offset %s [in module %s]"),
9694 abbrev_number, cu->per_cu->is_debug_types ? "TU" : "CU",
9695 sect_offset_str (cu->header.sect_off), bfd_get_filename (abfd));
9701 /* Scan the debug information for CU starting at INFO_PTR in buffer BUFFER.
9702 Returns a pointer to the end of a series of DIEs, terminated by an empty
9703 DIE. Any children of the skipped DIEs will also be skipped. */
9705 static const gdb_byte *
9706 skip_children (const struct die_reader_specs *reader, const gdb_byte *info_ptr)
9710 unsigned int bytes_read;
9711 abbrev_info *abbrev = peek_die_abbrev (*reader, info_ptr, &bytes_read);
9714 return info_ptr + bytes_read;
9716 info_ptr = skip_one_die (reader, info_ptr + bytes_read, abbrev);
9720 /* Scan the debug information for CU starting at INFO_PTR in buffer BUFFER.
9721 INFO_PTR should point just after the initial uleb128 of a DIE, and the
9722 abbrev corresponding to that skipped uleb128 should be passed in
9723 ABBREV. Returns a pointer to this DIE's sibling, skipping any
9726 static const gdb_byte *
9727 skip_one_die (const struct die_reader_specs *reader, const gdb_byte *info_ptr,
9728 struct abbrev_info *abbrev)
9730 unsigned int bytes_read;
9731 struct attribute attr;
9732 bfd *abfd = reader->abfd;
9733 struct dwarf2_cu *cu = reader->cu;
9734 const gdb_byte *buffer = reader->buffer;
9735 const gdb_byte *buffer_end = reader->buffer_end;
9736 unsigned int form, i;
9738 for (i = 0; i < abbrev->num_attrs; i++)
9740 /* The only abbrev we care about is DW_AT_sibling. */
9741 if (abbrev->attrs[i].name == DW_AT_sibling)
9743 read_attribute (reader, &attr, &abbrev->attrs[i], info_ptr);
9744 if (attr.form == DW_FORM_ref_addr)
9745 complaint (&symfile_complaints,
9746 _("ignoring absolute DW_AT_sibling"));
9749 sect_offset off = dwarf2_get_ref_die_offset (&attr);
9750 const gdb_byte *sibling_ptr = buffer + to_underlying (off);
9752 if (sibling_ptr < info_ptr)
9753 complaint (&symfile_complaints,
9754 _("DW_AT_sibling points backwards"));
9755 else if (sibling_ptr > reader->buffer_end)
9756 dwarf2_section_buffer_overflow_complaint (reader->die_section);
9762 /* If it isn't DW_AT_sibling, skip this attribute. */
9763 form = abbrev->attrs[i].form;
9767 case DW_FORM_ref_addr:
9768 /* In DWARF 2, DW_FORM_ref_addr is address sized; in DWARF 3
9769 and later it is offset sized. */
9770 if (cu->header.version == 2)
9771 info_ptr += cu->header.addr_size;
9773 info_ptr += cu->header.offset_size;
9775 case DW_FORM_GNU_ref_alt:
9776 info_ptr += cu->header.offset_size;
9779 info_ptr += cu->header.addr_size;
9786 case DW_FORM_flag_present:
9787 case DW_FORM_implicit_const:
9799 case DW_FORM_ref_sig8:
9802 case DW_FORM_data16:
9805 case DW_FORM_string:
9806 read_direct_string (abfd, info_ptr, &bytes_read);
9807 info_ptr += bytes_read;
9809 case DW_FORM_sec_offset:
9811 case DW_FORM_GNU_strp_alt:
9812 info_ptr += cu->header.offset_size;
9814 case DW_FORM_exprloc:
9816 info_ptr += read_unsigned_leb128 (abfd, info_ptr, &bytes_read);
9817 info_ptr += bytes_read;
9819 case DW_FORM_block1:
9820 info_ptr += 1 + read_1_byte (abfd, info_ptr);
9822 case DW_FORM_block2:
9823 info_ptr += 2 + read_2_bytes (abfd, info_ptr);
9825 case DW_FORM_block4:
9826 info_ptr += 4 + read_4_bytes (abfd, info_ptr);
9830 case DW_FORM_ref_udata:
9831 case DW_FORM_GNU_addr_index:
9832 case DW_FORM_GNU_str_index:
9833 info_ptr = safe_skip_leb128 (info_ptr, buffer_end);
9835 case DW_FORM_indirect:
9836 form = read_unsigned_leb128 (abfd, info_ptr, &bytes_read);
9837 info_ptr += bytes_read;
9838 /* We need to continue parsing from here, so just go back to
9840 goto skip_attribute;
9843 error (_("Dwarf Error: Cannot handle %s "
9844 "in DWARF reader [in module %s]"),
9845 dwarf_form_name (form),
9846 bfd_get_filename (abfd));
9850 if (abbrev->has_children)
9851 return skip_children (reader, info_ptr);
9856 /* Locate ORIG_PDI's sibling.
9857 INFO_PTR should point to the start of the next DIE after ORIG_PDI. */
9859 static const gdb_byte *
9860 locate_pdi_sibling (const struct die_reader_specs *reader,
9861 struct partial_die_info *orig_pdi,
9862 const gdb_byte *info_ptr)
9864 /* Do we know the sibling already? */
9866 if (orig_pdi->sibling)
9867 return orig_pdi->sibling;
9869 /* Are there any children to deal with? */
9871 if (!orig_pdi->has_children)
9874 /* Skip the children the long way. */
9876 return skip_children (reader, info_ptr);
9879 /* Expand this partial symbol table into a full symbol table. SELF is
9883 dwarf2_read_symtab (struct partial_symtab *self,
9884 struct objfile *objfile)
9886 struct dwarf2_per_objfile *dwarf2_per_objfile
9887 = get_dwarf2_per_objfile (objfile);
9891 warning (_("bug: psymtab for %s is already read in."),
9898 printf_filtered (_("Reading in symbols for %s..."),
9900 gdb_flush (gdb_stdout);
9903 /* If this psymtab is constructed from a debug-only objfile, the
9904 has_section_at_zero flag will not necessarily be correct. We
9905 can get the correct value for this flag by looking at the data
9906 associated with the (presumably stripped) associated objfile. */
9907 if (objfile->separate_debug_objfile_backlink)
9909 struct dwarf2_per_objfile *dpo_backlink
9910 = get_dwarf2_per_objfile (objfile->separate_debug_objfile_backlink);
9912 dwarf2_per_objfile->has_section_at_zero
9913 = dpo_backlink->has_section_at_zero;
9916 dwarf2_per_objfile->reading_partial_symbols = 0;
9918 psymtab_to_symtab_1 (self);
9920 /* Finish up the debug error message. */
9922 printf_filtered (_("done.\n"));
9925 process_cu_includes (dwarf2_per_objfile);
9928 /* Reading in full CUs. */
9930 /* Add PER_CU to the queue. */
9933 queue_comp_unit (struct dwarf2_per_cu_data *per_cu,
9934 enum language pretend_language)
9936 struct dwarf2_queue_item *item;
9939 item = XNEW (struct dwarf2_queue_item);
9940 item->per_cu = per_cu;
9941 item->pretend_language = pretend_language;
9944 if (dwarf2_queue == NULL)
9945 dwarf2_queue = item;
9947 dwarf2_queue_tail->next = item;
9949 dwarf2_queue_tail = item;
9952 /* If PER_CU is not yet queued, add it to the queue.
9953 If DEPENDENT_CU is non-NULL, it has a reference to PER_CU so add a
9955 The result is non-zero if PER_CU was queued, otherwise the result is zero
9956 meaning either PER_CU is already queued or it is already loaded.
9958 N.B. There is an invariant here that if a CU is queued then it is loaded.
9959 The caller is required to load PER_CU if we return non-zero. */
9962 maybe_queue_comp_unit (struct dwarf2_cu *dependent_cu,
9963 struct dwarf2_per_cu_data *per_cu,
9964 enum language pretend_language)
9966 /* We may arrive here during partial symbol reading, if we need full
9967 DIEs to process an unusual case (e.g. template arguments). Do
9968 not queue PER_CU, just tell our caller to load its DIEs. */
9969 if (per_cu->dwarf2_per_objfile->reading_partial_symbols)
9971 if (per_cu->cu == NULL || per_cu->cu->dies == NULL)
9976 /* Mark the dependence relation so that we don't flush PER_CU
9978 if (dependent_cu != NULL)
9979 dwarf2_add_dependence (dependent_cu, per_cu);
9981 /* If it's already on the queue, we have nothing to do. */
9985 /* If the compilation unit is already loaded, just mark it as
9987 if (per_cu->cu != NULL)
9989 per_cu->cu->last_used = 0;
9993 /* Add it to the queue. */
9994 queue_comp_unit (per_cu, pretend_language);
9999 /* Process the queue. */
10002 process_queue (struct dwarf2_per_objfile *dwarf2_per_objfile)
10004 struct dwarf2_queue_item *item, *next_item;
10006 if (dwarf_read_debug)
10008 fprintf_unfiltered (gdb_stdlog,
10009 "Expanding one or more symtabs of objfile %s ...\n",
10010 objfile_name (dwarf2_per_objfile->objfile));
10013 /* The queue starts out with one item, but following a DIE reference
10014 may load a new CU, adding it to the end of the queue. */
10015 for (item = dwarf2_queue; item != NULL; dwarf2_queue = item = next_item)
10017 if ((dwarf2_per_objfile->using_index
10018 ? !item->per_cu->v.quick->compunit_symtab
10019 : (item->per_cu->v.psymtab && !item->per_cu->v.psymtab->readin))
10020 /* Skip dummy CUs. */
10021 && item->per_cu->cu != NULL)
10023 struct dwarf2_per_cu_data *per_cu = item->per_cu;
10024 unsigned int debug_print_threshold;
10027 if (per_cu->is_debug_types)
10029 struct signatured_type *sig_type =
10030 (struct signatured_type *) per_cu;
10032 sprintf (buf, "TU %s at offset %s",
10033 hex_string (sig_type->signature),
10034 sect_offset_str (per_cu->sect_off));
10035 /* There can be 100s of TUs.
10036 Only print them in verbose mode. */
10037 debug_print_threshold = 2;
10041 sprintf (buf, "CU at offset %s",
10042 sect_offset_str (per_cu->sect_off));
10043 debug_print_threshold = 1;
10046 if (dwarf_read_debug >= debug_print_threshold)
10047 fprintf_unfiltered (gdb_stdlog, "Expanding symtab of %s\n", buf);
10049 if (per_cu->is_debug_types)
10050 process_full_type_unit (per_cu, item->pretend_language);
10052 process_full_comp_unit (per_cu, item->pretend_language);
10054 if (dwarf_read_debug >= debug_print_threshold)
10055 fprintf_unfiltered (gdb_stdlog, "Done expanding %s\n", buf);
10058 item->per_cu->queued = 0;
10059 next_item = item->next;
10063 dwarf2_queue_tail = NULL;
10065 if (dwarf_read_debug)
10067 fprintf_unfiltered (gdb_stdlog, "Done expanding symtabs of %s.\n",
10068 objfile_name (dwarf2_per_objfile->objfile));
10072 /* Read in full symbols for PST, and anything it depends on. */
10075 psymtab_to_symtab_1 (struct partial_symtab *pst)
10077 struct dwarf2_per_cu_data *per_cu;
10083 for (i = 0; i < pst->number_of_dependencies; i++)
10084 if (!pst->dependencies[i]->readin
10085 && pst->dependencies[i]->user == NULL)
10087 /* Inform about additional files that need to be read in. */
10090 /* FIXME: i18n: Need to make this a single string. */
10091 fputs_filtered (" ", gdb_stdout);
10093 fputs_filtered ("and ", gdb_stdout);
10095 printf_filtered ("%s...", pst->dependencies[i]->filename);
10096 wrap_here (""); /* Flush output. */
10097 gdb_flush (gdb_stdout);
10099 psymtab_to_symtab_1 (pst->dependencies[i]);
10102 per_cu = (struct dwarf2_per_cu_data *) pst->read_symtab_private;
10104 if (per_cu == NULL)
10106 /* It's an include file, no symbols to read for it.
10107 Everything is in the parent symtab. */
10112 dw2_do_instantiate_symtab (per_cu);
10115 /* Trivial hash function for die_info: the hash value of a DIE
10116 is its offset in .debug_info for this objfile. */
10119 die_hash (const void *item)
10121 const struct die_info *die = (const struct die_info *) item;
10123 return to_underlying (die->sect_off);
10126 /* Trivial comparison function for die_info structures: two DIEs
10127 are equal if they have the same offset. */
10130 die_eq (const void *item_lhs, const void *item_rhs)
10132 const struct die_info *die_lhs = (const struct die_info *) item_lhs;
10133 const struct die_info *die_rhs = (const struct die_info *) item_rhs;
10135 return die_lhs->sect_off == die_rhs->sect_off;
10138 /* die_reader_func for load_full_comp_unit.
10139 This is identical to read_signatured_type_reader,
10140 but is kept separate for now. */
10143 load_full_comp_unit_reader (const struct die_reader_specs *reader,
10144 const gdb_byte *info_ptr,
10145 struct die_info *comp_unit_die,
10149 struct dwarf2_cu *cu = reader->cu;
10150 enum language *language_ptr = (enum language *) data;
10152 gdb_assert (cu->die_hash == NULL);
10154 htab_create_alloc_ex (cu->header.length / 12,
10158 &cu->comp_unit_obstack,
10159 hashtab_obstack_allocate,
10160 dummy_obstack_deallocate);
10163 comp_unit_die->child = read_die_and_siblings (reader, info_ptr,
10164 &info_ptr, comp_unit_die);
10165 cu->dies = comp_unit_die;
10166 /* comp_unit_die is not stored in die_hash, no need. */
10168 /* We try not to read any attributes in this function, because not
10169 all CUs needed for references have been loaded yet, and symbol
10170 table processing isn't initialized. But we have to set the CU language,
10171 or we won't be able to build types correctly.
10172 Similarly, if we do not read the producer, we can not apply
10173 producer-specific interpretation. */
10174 prepare_one_comp_unit (cu, cu->dies, *language_ptr);
10177 /* Load the DIEs associated with PER_CU into memory. */
10180 load_full_comp_unit (struct dwarf2_per_cu_data *this_cu,
10181 enum language pretend_language)
10183 gdb_assert (! this_cu->is_debug_types);
10185 init_cutu_and_read_dies (this_cu, NULL, 1, 1,
10186 load_full_comp_unit_reader, &pretend_language);
10189 /* Add a DIE to the delayed physname list. */
10192 add_to_method_list (struct type *type, int fnfield_index, int index,
10193 const char *name, struct die_info *die,
10194 struct dwarf2_cu *cu)
10196 struct delayed_method_info mi;
10198 mi.fnfield_index = fnfield_index;
10202 cu->method_list.push_back (mi);
10205 /* Check whether [PHYSNAME, PHYSNAME+LEN) ends with a modifier like
10206 "const" / "volatile". If so, decrements LEN by the length of the
10207 modifier and return true. Otherwise return false. */
10211 check_modifier (const char *physname, size_t &len, const char (&mod)[N])
10213 size_t mod_len = sizeof (mod) - 1;
10214 if (len > mod_len && startswith (physname + (len - mod_len), mod))
10222 /* Compute the physnames of any methods on the CU's method list.
10224 The computation of method physnames is delayed in order to avoid the
10225 (bad) condition that one of the method's formal parameters is of an as yet
10226 incomplete type. */
10229 compute_delayed_physnames (struct dwarf2_cu *cu)
10231 /* Only C++ delays computing physnames. */
10232 if (cu->method_list.empty ())
10234 gdb_assert (cu->language == language_cplus);
10236 for (struct delayed_method_info &mi : cu->method_list)
10238 const char *physname;
10239 struct fn_fieldlist *fn_flp
10240 = &TYPE_FN_FIELDLIST (mi.type, mi.fnfield_index);
10241 physname = dwarf2_physname (mi.name, mi.die, cu);
10242 TYPE_FN_FIELD_PHYSNAME (fn_flp->fn_fields, mi.index)
10243 = physname ? physname : "";
10245 /* Since there's no tag to indicate whether a method is a
10246 const/volatile overload, extract that information out of the
10248 if (physname != NULL)
10250 size_t len = strlen (physname);
10254 if (physname[len] == ')') /* shortcut */
10256 else if (check_modifier (physname, len, " const"))
10257 TYPE_FN_FIELD_CONST (fn_flp->fn_fields, mi.index) = 1;
10258 else if (check_modifier (physname, len, " volatile"))
10259 TYPE_FN_FIELD_VOLATILE (fn_flp->fn_fields, mi.index) = 1;
10266 /* The list is no longer needed. */
10267 cu->method_list.clear ();
10270 /* Go objects should be embedded in a DW_TAG_module DIE,
10271 and it's not clear if/how imported objects will appear.
10272 To keep Go support simple until that's worked out,
10273 go back through what we've read and create something usable.
10274 We could do this while processing each DIE, and feels kinda cleaner,
10275 but that way is more invasive.
10276 This is to, for example, allow the user to type "p var" or "b main"
10277 without having to specify the package name, and allow lookups
10278 of module.object to work in contexts that use the expression
10282 fixup_go_packaging (struct dwarf2_cu *cu)
10284 char *package_name = NULL;
10285 struct pending *list;
10288 for (list = global_symbols; list != NULL; list = list->next)
10290 for (i = 0; i < list->nsyms; ++i)
10292 struct symbol *sym = list->symbol[i];
10294 if (SYMBOL_LANGUAGE (sym) == language_go
10295 && SYMBOL_CLASS (sym) == LOC_BLOCK)
10297 char *this_package_name = go_symbol_package_name (sym);
10299 if (this_package_name == NULL)
10301 if (package_name == NULL)
10302 package_name = this_package_name;
10305 struct objfile *objfile
10306 = cu->per_cu->dwarf2_per_objfile->objfile;
10307 if (strcmp (package_name, this_package_name) != 0)
10308 complaint (&symfile_complaints,
10309 _("Symtab %s has objects from two different Go packages: %s and %s"),
10310 (symbol_symtab (sym) != NULL
10311 ? symtab_to_filename_for_display
10312 (symbol_symtab (sym))
10313 : objfile_name (objfile)),
10314 this_package_name, package_name);
10315 xfree (this_package_name);
10321 if (package_name != NULL)
10323 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
10324 const char *saved_package_name
10325 = (const char *) obstack_copy0 (&objfile->per_bfd->storage_obstack,
10327 strlen (package_name));
10328 struct type *type = init_type (objfile, TYPE_CODE_MODULE, 0,
10329 saved_package_name);
10330 struct symbol *sym;
10332 TYPE_TAG_NAME (type) = TYPE_NAME (type);
10334 sym = allocate_symbol (objfile);
10335 SYMBOL_SET_LANGUAGE (sym, language_go, &objfile->objfile_obstack);
10336 SYMBOL_SET_NAMES (sym, saved_package_name,
10337 strlen (saved_package_name), 0, objfile);
10338 /* This is not VAR_DOMAIN because we want a way to ensure a lookup of,
10339 e.g., "main" finds the "main" module and not C's main(). */
10340 SYMBOL_DOMAIN (sym) = STRUCT_DOMAIN;
10341 SYMBOL_ACLASS_INDEX (sym) = LOC_TYPEDEF;
10342 SYMBOL_TYPE (sym) = type;
10344 add_symbol_to_list (sym, &global_symbols);
10346 xfree (package_name);
10350 /* Allocate a fully-qualified name consisting of the two parts on the
10353 static const char *
10354 rust_fully_qualify (struct obstack *obstack, const char *p1, const char *p2)
10356 return obconcat (obstack, p1, "::", p2, (char *) NULL);
10359 /* A helper that allocates a struct discriminant_info to attach to a
10362 static struct discriminant_info *
10363 alloc_discriminant_info (struct type *type, int discriminant_index,
10366 gdb_assert (TYPE_CODE (type) == TYPE_CODE_UNION);
10367 gdb_assert (default_index == -1
10368 || (default_index > 0 && default_index < TYPE_NFIELDS (type)));
10370 TYPE_FLAG_DISCRIMINATED_UNION (type) = 1;
10372 struct discriminant_info *disc
10373 = ((struct discriminant_info *)
10375 offsetof (struct discriminant_info, discriminants)
10376 + TYPE_NFIELDS (type) * sizeof (disc->discriminants[0])));
10377 disc->default_index = default_index;
10378 disc->discriminant_index = discriminant_index;
10380 struct dynamic_prop prop;
10381 prop.kind = PROP_UNDEFINED;
10382 prop.data.baton = disc;
10384 add_dyn_prop (DYN_PROP_DISCRIMINATED, prop, type);
10389 /* Some versions of rustc emitted enums in an unusual way.
10391 Ordinary enums were emitted as unions. The first element of each
10392 structure in the union was named "RUST$ENUM$DISR". This element
10393 held the discriminant.
10395 These versions of Rust also implemented the "non-zero"
10396 optimization. When the enum had two values, and one is empty and
10397 the other holds a pointer that cannot be zero, the pointer is used
10398 as the discriminant, with a zero value meaning the empty variant.
10399 Here, the union's first member is of the form
10400 RUST$ENCODED$ENUM$<fieldno>$<fieldno>$...$<variantname>
10401 where the fieldnos are the indices of the fields that should be
10402 traversed in order to find the field (which may be several fields deep)
10403 and the variantname is the name of the variant of the case when the
10406 This function recognizes whether TYPE is of one of these forms,
10407 and, if so, smashes it to be a variant type. */
10410 quirk_rust_enum (struct type *type, struct objfile *objfile)
10412 gdb_assert (TYPE_CODE (type) == TYPE_CODE_UNION);
10414 /* We don't need to deal with empty enums. */
10415 if (TYPE_NFIELDS (type) == 0)
10418 #define RUST_ENUM_PREFIX "RUST$ENCODED$ENUM$"
10419 if (TYPE_NFIELDS (type) == 1
10420 && startswith (TYPE_FIELD_NAME (type, 0), RUST_ENUM_PREFIX))
10422 const char *name = TYPE_FIELD_NAME (type, 0) + strlen (RUST_ENUM_PREFIX);
10424 /* Decode the field name to find the offset of the
10426 ULONGEST bit_offset = 0;
10427 struct type *field_type = TYPE_FIELD_TYPE (type, 0);
10428 while (name[0] >= '0' && name[0] <= '9')
10431 unsigned long index = strtoul (name, &tail, 10);
10434 || index >= TYPE_NFIELDS (field_type)
10435 || (TYPE_FIELD_LOC_KIND (field_type, index)
10436 != FIELD_LOC_KIND_BITPOS))
10438 complaint (&symfile_complaints,
10439 _("Could not parse Rust enum encoding string \"%s\""
10441 TYPE_FIELD_NAME (type, 0),
10442 objfile_name (objfile));
10447 bit_offset += TYPE_FIELD_BITPOS (field_type, index);
10448 field_type = TYPE_FIELD_TYPE (field_type, index);
10451 /* Make a union to hold the variants. */
10452 struct type *union_type = alloc_type (objfile);
10453 TYPE_CODE (union_type) = TYPE_CODE_UNION;
10454 TYPE_NFIELDS (union_type) = 3;
10455 TYPE_FIELDS (union_type)
10456 = (struct field *) TYPE_ZALLOC (type, 3 * sizeof (struct field));
10457 TYPE_LENGTH (union_type) = TYPE_LENGTH (type);
10459 /* Put the discriminant must at index 0. */
10460 TYPE_FIELD_TYPE (union_type, 0) = field_type;
10461 TYPE_FIELD_ARTIFICIAL (union_type, 0) = 1;
10462 TYPE_FIELD_NAME (union_type, 0) = "<<discriminant>>";
10463 SET_FIELD_BITPOS (TYPE_FIELD (union_type, 0), bit_offset);
10465 /* The order of fields doesn't really matter, so put the real
10466 field at index 1 and the data-less field at index 2. */
10467 struct discriminant_info *disc
10468 = alloc_discriminant_info (union_type, 0, 1);
10469 TYPE_FIELD (union_type, 1) = TYPE_FIELD (type, 0);
10470 TYPE_FIELD_NAME (union_type, 1)
10471 = rust_last_path_segment (TYPE_NAME (TYPE_FIELD_TYPE (union_type, 1)));
10472 TYPE_NAME (TYPE_FIELD_TYPE (union_type, 1))
10473 = rust_fully_qualify (&objfile->objfile_obstack, TYPE_NAME (type),
10474 TYPE_FIELD_NAME (union_type, 1));
10476 const char *dataless_name
10477 = rust_fully_qualify (&objfile->objfile_obstack, TYPE_NAME (type),
10479 struct type *dataless_type = init_type (objfile, TYPE_CODE_VOID, 0,
10481 TYPE_FIELD_TYPE (union_type, 2) = dataless_type;
10482 /* NAME points into the original discriminant name, which
10483 already has the correct lifetime. */
10484 TYPE_FIELD_NAME (union_type, 2) = name;
10485 SET_FIELD_BITPOS (TYPE_FIELD (union_type, 2), 0);
10486 disc->discriminants[2] = 0;
10488 /* Smash this type to be a structure type. We have to do this
10489 because the type has already been recorded. */
10490 TYPE_CODE (type) = TYPE_CODE_STRUCT;
10491 TYPE_NFIELDS (type) = 1;
10493 = (struct field *) TYPE_ZALLOC (type, sizeof (struct field));
10495 /* Install the variant part. */
10496 TYPE_FIELD_TYPE (type, 0) = union_type;
10497 SET_FIELD_BITPOS (TYPE_FIELD (type, 0), 0);
10498 TYPE_FIELD_NAME (type, 0) = "<<variants>>";
10500 else if (TYPE_NFIELDS (type) == 1)
10502 /* We assume that a union with a single field is a univariant
10504 /* Smash this type to be a structure type. We have to do this
10505 because the type has already been recorded. */
10506 TYPE_CODE (type) = TYPE_CODE_STRUCT;
10508 /* Make a union to hold the variants. */
10509 struct type *union_type = alloc_type (objfile);
10510 TYPE_CODE (union_type) = TYPE_CODE_UNION;
10511 TYPE_NFIELDS (union_type) = TYPE_NFIELDS (type);
10512 TYPE_LENGTH (union_type) = TYPE_LENGTH (type);
10513 TYPE_FIELDS (union_type) = TYPE_FIELDS (type);
10515 struct type *field_type = TYPE_FIELD_TYPE (union_type, 0);
10516 const char *variant_name
10517 = rust_last_path_segment (TYPE_NAME (field_type));
10518 TYPE_FIELD_NAME (union_type, 0) = variant_name;
10519 TYPE_NAME (field_type)
10520 = rust_fully_qualify (&objfile->objfile_obstack,
10521 TYPE_NAME (field_type), variant_name);
10523 /* Install the union in the outer struct type. */
10524 TYPE_NFIELDS (type) = 1;
10526 = (struct field *) TYPE_ZALLOC (union_type, sizeof (struct field));
10527 TYPE_FIELD_TYPE (type, 0) = union_type;
10528 TYPE_FIELD_NAME (type, 0) = "<<variants>>";
10529 SET_FIELD_BITPOS (TYPE_FIELD (type, 0), 0);
10531 alloc_discriminant_info (union_type, -1, 0);
10535 struct type *disr_type = nullptr;
10536 for (int i = 0; i < TYPE_NFIELDS (type); ++i)
10538 disr_type = TYPE_FIELD_TYPE (type, i);
10540 if (TYPE_NFIELDS (disr_type) == 0)
10542 /* Could be data-less variant, so keep going. */
10544 else if (strcmp (TYPE_FIELD_NAME (disr_type, 0),
10545 "RUST$ENUM$DISR") != 0)
10547 /* Not a Rust enum. */
10557 /* If we got here without a discriminant, then it's probably
10559 if (disr_type == nullptr)
10562 /* Smash this type to be a structure type. We have to do this
10563 because the type has already been recorded. */
10564 TYPE_CODE (type) = TYPE_CODE_STRUCT;
10566 /* Make a union to hold the variants. */
10567 struct field *disr_field = &TYPE_FIELD (disr_type, 0);
10568 struct type *union_type = alloc_type (objfile);
10569 TYPE_CODE (union_type) = TYPE_CODE_UNION;
10570 TYPE_NFIELDS (union_type) = 1 + TYPE_NFIELDS (type);
10571 TYPE_LENGTH (union_type) = TYPE_LENGTH (type);
10572 TYPE_FIELDS (union_type)
10573 = (struct field *) TYPE_ZALLOC (union_type,
10574 (TYPE_NFIELDS (union_type)
10575 * sizeof (struct field)));
10577 memcpy (TYPE_FIELDS (union_type) + 1, TYPE_FIELDS (type),
10578 TYPE_NFIELDS (type) * sizeof (struct field));
10580 /* Install the discriminant at index 0 in the union. */
10581 TYPE_FIELD (union_type, 0) = *disr_field;
10582 TYPE_FIELD_ARTIFICIAL (union_type, 0) = 1;
10583 TYPE_FIELD_NAME (union_type, 0) = "<<discriminant>>";
10585 /* Install the union in the outer struct type. */
10586 TYPE_FIELD_TYPE (type, 0) = union_type;
10587 TYPE_FIELD_NAME (type, 0) = "<<variants>>";
10588 TYPE_NFIELDS (type) = 1;
10590 /* Set the size and offset of the union type. */
10591 SET_FIELD_BITPOS (TYPE_FIELD (type, 0), 0);
10593 /* We need a way to find the correct discriminant given a
10594 variant name. For convenience we build a map here. */
10595 struct type *enum_type = FIELD_TYPE (*disr_field);
10596 std::unordered_map<std::string, ULONGEST> discriminant_map;
10597 for (int i = 0; i < TYPE_NFIELDS (enum_type); ++i)
10599 if (TYPE_FIELD_LOC_KIND (enum_type, i) == FIELD_LOC_KIND_ENUMVAL)
10602 = rust_last_path_segment (TYPE_FIELD_NAME (enum_type, i));
10603 discriminant_map[name] = TYPE_FIELD_ENUMVAL (enum_type, i);
10607 int n_fields = TYPE_NFIELDS (union_type);
10608 struct discriminant_info *disc
10609 = alloc_discriminant_info (union_type, 0, -1);
10610 /* Skip the discriminant here. */
10611 for (int i = 1; i < n_fields; ++i)
10613 /* Find the final word in the name of this variant's type.
10614 That name can be used to look up the correct
10616 const char *variant_name
10617 = rust_last_path_segment (TYPE_NAME (TYPE_FIELD_TYPE (union_type,
10620 auto iter = discriminant_map.find (variant_name);
10621 if (iter != discriminant_map.end ())
10622 disc->discriminants[i] = iter->second;
10624 /* Remove the discriminant field. */
10625 struct type *sub_type = TYPE_FIELD_TYPE (union_type, i);
10626 --TYPE_NFIELDS (sub_type);
10627 ++TYPE_FIELDS (sub_type);
10628 TYPE_FIELD_NAME (union_type, i) = variant_name;
10629 TYPE_NAME (sub_type)
10630 = rust_fully_qualify (&objfile->objfile_obstack,
10631 TYPE_NAME (type), variant_name);
10636 /* Rewrite some Rust unions to be structures with variants parts. */
10639 rust_union_quirks (struct dwarf2_cu *cu)
10641 gdb_assert (cu->language == language_rust);
10642 for (struct type *type : cu->rust_unions)
10643 quirk_rust_enum (type, cu->per_cu->dwarf2_per_objfile->objfile);
10646 /* Return the symtab for PER_CU. This works properly regardless of
10647 whether we're using the index or psymtabs. */
10649 static struct compunit_symtab *
10650 get_compunit_symtab (struct dwarf2_per_cu_data *per_cu)
10652 return (per_cu->dwarf2_per_objfile->using_index
10653 ? per_cu->v.quick->compunit_symtab
10654 : per_cu->v.psymtab->compunit_symtab);
10657 /* A helper function for computing the list of all symbol tables
10658 included by PER_CU. */
10661 recursively_compute_inclusions (VEC (compunit_symtab_ptr) **result,
10662 htab_t all_children, htab_t all_type_symtabs,
10663 struct dwarf2_per_cu_data *per_cu,
10664 struct compunit_symtab *immediate_parent)
10668 struct compunit_symtab *cust;
10669 struct dwarf2_per_cu_data *iter;
10671 slot = htab_find_slot (all_children, per_cu, INSERT);
10674 /* This inclusion and its children have been processed. */
10679 /* Only add a CU if it has a symbol table. */
10680 cust = get_compunit_symtab (per_cu);
10683 /* If this is a type unit only add its symbol table if we haven't
10684 seen it yet (type unit per_cu's can share symtabs). */
10685 if (per_cu->is_debug_types)
10687 slot = htab_find_slot (all_type_symtabs, cust, INSERT);
10691 VEC_safe_push (compunit_symtab_ptr, *result, cust);
10692 if (cust->user == NULL)
10693 cust->user = immediate_parent;
10698 VEC_safe_push (compunit_symtab_ptr, *result, cust);
10699 if (cust->user == NULL)
10700 cust->user = immediate_parent;
10705 VEC_iterate (dwarf2_per_cu_ptr, per_cu->imported_symtabs, ix, iter);
10708 recursively_compute_inclusions (result, all_children,
10709 all_type_symtabs, iter, cust);
10713 /* Compute the compunit_symtab 'includes' fields for the compunit_symtab of
10717 compute_compunit_symtab_includes (struct dwarf2_per_cu_data *per_cu)
10719 gdb_assert (! per_cu->is_debug_types);
10721 if (!VEC_empty (dwarf2_per_cu_ptr, per_cu->imported_symtabs))
10724 struct dwarf2_per_cu_data *per_cu_iter;
10725 struct compunit_symtab *compunit_symtab_iter;
10726 VEC (compunit_symtab_ptr) *result_symtabs = NULL;
10727 htab_t all_children, all_type_symtabs;
10728 struct compunit_symtab *cust = get_compunit_symtab (per_cu);
10730 /* If we don't have a symtab, we can just skip this case. */
10734 all_children = htab_create_alloc (1, htab_hash_pointer, htab_eq_pointer,
10735 NULL, xcalloc, xfree);
10736 all_type_symtabs = htab_create_alloc (1, htab_hash_pointer, htab_eq_pointer,
10737 NULL, xcalloc, xfree);
10740 VEC_iterate (dwarf2_per_cu_ptr, per_cu->imported_symtabs,
10744 recursively_compute_inclusions (&result_symtabs, all_children,
10745 all_type_symtabs, per_cu_iter,
10749 /* Now we have a transitive closure of all the included symtabs. */
10750 len = VEC_length (compunit_symtab_ptr, result_symtabs);
10752 = XOBNEWVEC (&per_cu->dwarf2_per_objfile->objfile->objfile_obstack,
10753 struct compunit_symtab *, len + 1);
10755 VEC_iterate (compunit_symtab_ptr, result_symtabs, ix,
10756 compunit_symtab_iter);
10758 cust->includes[ix] = compunit_symtab_iter;
10759 cust->includes[len] = NULL;
10761 VEC_free (compunit_symtab_ptr, result_symtabs);
10762 htab_delete (all_children);
10763 htab_delete (all_type_symtabs);
10767 /* Compute the 'includes' field for the symtabs of all the CUs we just
10771 process_cu_includes (struct dwarf2_per_objfile *dwarf2_per_objfile)
10774 struct dwarf2_per_cu_data *iter;
10777 VEC_iterate (dwarf2_per_cu_ptr, dwarf2_per_objfile->just_read_cus,
10781 if (! iter->is_debug_types)
10782 compute_compunit_symtab_includes (iter);
10785 VEC_free (dwarf2_per_cu_ptr, dwarf2_per_objfile->just_read_cus);
10788 /* Generate full symbol information for PER_CU, whose DIEs have
10789 already been loaded into memory. */
10792 process_full_comp_unit (struct dwarf2_per_cu_data *per_cu,
10793 enum language pretend_language)
10795 struct dwarf2_cu *cu = per_cu->cu;
10796 struct dwarf2_per_objfile *dwarf2_per_objfile = per_cu->dwarf2_per_objfile;
10797 struct objfile *objfile = dwarf2_per_objfile->objfile;
10798 struct gdbarch *gdbarch = get_objfile_arch (objfile);
10799 CORE_ADDR lowpc, highpc;
10800 struct compunit_symtab *cust;
10801 CORE_ADDR baseaddr;
10802 struct block *static_block;
10805 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
10808 scoped_free_pendings free_pending;
10810 /* Clear the list here in case something was left over. */
10811 cu->method_list.clear ();
10813 cu->list_in_scope = &file_symbols;
10815 cu->language = pretend_language;
10816 cu->language_defn = language_def (cu->language);
10818 /* Do line number decoding in read_file_scope () */
10819 process_die (cu->dies, cu);
10821 /* For now fudge the Go package. */
10822 if (cu->language == language_go)
10823 fixup_go_packaging (cu);
10825 /* Now that we have processed all the DIEs in the CU, all the types
10826 should be complete, and it should now be safe to compute all of the
10828 compute_delayed_physnames (cu);
10830 if (cu->language == language_rust)
10831 rust_union_quirks (cu);
10833 /* Some compilers don't define a DW_AT_high_pc attribute for the
10834 compilation unit. If the DW_AT_high_pc is missing, synthesize
10835 it, by scanning the DIE's below the compilation unit. */
10836 get_scope_pc_bounds (cu->dies, &lowpc, &highpc, cu);
10838 addr = gdbarch_adjust_dwarf2_addr (gdbarch, highpc + baseaddr);
10839 static_block = end_symtab_get_static_block (addr, 0, 1);
10841 /* If the comp unit has DW_AT_ranges, it may have discontiguous ranges.
10842 Also, DW_AT_ranges may record ranges not belonging to any child DIEs
10843 (such as virtual method tables). Record the ranges in STATIC_BLOCK's
10844 addrmap to help ensure it has an accurate map of pc values belonging to
10846 dwarf2_record_block_ranges (cu->dies, static_block, baseaddr, cu);
10848 cust = end_symtab_from_static_block (static_block,
10849 SECT_OFF_TEXT (objfile), 0);
10853 int gcc_4_minor = producer_is_gcc_ge_4 (cu->producer);
10855 /* Set symtab language to language from DW_AT_language. If the
10856 compilation is from a C file generated by language preprocessors, do
10857 not set the language if it was already deduced by start_subfile. */
10858 if (!(cu->language == language_c
10859 && COMPUNIT_FILETABS (cust)->language != language_unknown))
10860 COMPUNIT_FILETABS (cust)->language = cu->language;
10862 /* GCC-4.0 has started to support -fvar-tracking. GCC-3.x still can
10863 produce DW_AT_location with location lists but it can be possibly
10864 invalid without -fvar-tracking. Still up to GCC-4.4.x incl. 4.4.0
10865 there were bugs in prologue debug info, fixed later in GCC-4.5
10866 by "unwind info for epilogues" patch (which is not directly related).
10868 For -gdwarf-4 type units LOCATIONS_VALID indication is fortunately not
10869 needed, it would be wrong due to missing DW_AT_producer there.
10871 Still one can confuse GDB by using non-standard GCC compilation
10872 options - this waits on GCC PR other/32998 (-frecord-gcc-switches).
10874 if (cu->has_loclist && gcc_4_minor >= 5)
10875 cust->locations_valid = 1;
10877 if (gcc_4_minor >= 5)
10878 cust->epilogue_unwind_valid = 1;
10880 cust->call_site_htab = cu->call_site_htab;
10883 if (dwarf2_per_objfile->using_index)
10884 per_cu->v.quick->compunit_symtab = cust;
10887 struct partial_symtab *pst = per_cu->v.psymtab;
10888 pst->compunit_symtab = cust;
10892 /* Push it for inclusion processing later. */
10893 VEC_safe_push (dwarf2_per_cu_ptr, dwarf2_per_objfile->just_read_cus, per_cu);
10896 /* Generate full symbol information for type unit PER_CU, whose DIEs have
10897 already been loaded into memory. */
10900 process_full_type_unit (struct dwarf2_per_cu_data *per_cu,
10901 enum language pretend_language)
10903 struct dwarf2_cu *cu = per_cu->cu;
10904 struct dwarf2_per_objfile *dwarf2_per_objfile = per_cu->dwarf2_per_objfile;
10905 struct objfile *objfile = dwarf2_per_objfile->objfile;
10906 struct compunit_symtab *cust;
10907 struct signatured_type *sig_type;
10909 gdb_assert (per_cu->is_debug_types);
10910 sig_type = (struct signatured_type *) per_cu;
10913 scoped_free_pendings free_pending;
10915 /* Clear the list here in case something was left over. */
10916 cu->method_list.clear ();
10918 cu->list_in_scope = &file_symbols;
10920 cu->language = pretend_language;
10921 cu->language_defn = language_def (cu->language);
10923 /* The symbol tables are set up in read_type_unit_scope. */
10924 process_die (cu->dies, cu);
10926 /* For now fudge the Go package. */
10927 if (cu->language == language_go)
10928 fixup_go_packaging (cu);
10930 /* Now that we have processed all the DIEs in the CU, all the types
10931 should be complete, and it should now be safe to compute all of the
10933 compute_delayed_physnames (cu);
10935 if (cu->language == language_rust)
10936 rust_union_quirks (cu);
10938 /* TUs share symbol tables.
10939 If this is the first TU to use this symtab, complete the construction
10940 of it with end_expandable_symtab. Otherwise, complete the addition of
10941 this TU's symbols to the existing symtab. */
10942 if (sig_type->type_unit_group->compunit_symtab == NULL)
10944 cust = end_expandable_symtab (0, SECT_OFF_TEXT (objfile));
10945 sig_type->type_unit_group->compunit_symtab = cust;
10949 /* Set symtab language to language from DW_AT_language. If the
10950 compilation is from a C file generated by language preprocessors,
10951 do not set the language if it was already deduced by
10953 if (!(cu->language == language_c
10954 && COMPUNIT_FILETABS (cust)->language != language_c))
10955 COMPUNIT_FILETABS (cust)->language = cu->language;
10960 augment_type_symtab ();
10961 cust = sig_type->type_unit_group->compunit_symtab;
10964 if (dwarf2_per_objfile->using_index)
10965 per_cu->v.quick->compunit_symtab = cust;
10968 struct partial_symtab *pst = per_cu->v.psymtab;
10969 pst->compunit_symtab = cust;
10974 /* Process an imported unit DIE. */
10977 process_imported_unit_die (struct die_info *die, struct dwarf2_cu *cu)
10979 struct attribute *attr;
10981 /* For now we don't handle imported units in type units. */
10982 if (cu->per_cu->is_debug_types)
10984 error (_("Dwarf Error: DW_TAG_imported_unit is not"
10985 " supported in type units [in module %s]"),
10986 objfile_name (cu->per_cu->dwarf2_per_objfile->objfile));
10989 attr = dwarf2_attr (die, DW_AT_import, cu);
10992 sect_offset sect_off = dwarf2_get_ref_die_offset (attr);
10993 bool is_dwz = (attr->form == DW_FORM_GNU_ref_alt || cu->per_cu->is_dwz);
10994 dwarf2_per_cu_data *per_cu
10995 = dwarf2_find_containing_comp_unit (sect_off, is_dwz,
10996 cu->per_cu->dwarf2_per_objfile);
10998 /* If necessary, add it to the queue and load its DIEs. */
10999 if (maybe_queue_comp_unit (cu, per_cu, cu->language))
11000 load_full_comp_unit (per_cu, cu->language);
11002 VEC_safe_push (dwarf2_per_cu_ptr, cu->per_cu->imported_symtabs,
11007 /* RAII object that represents a process_die scope: i.e.,
11008 starts/finishes processing a DIE. */
11009 class process_die_scope
11012 process_die_scope (die_info *die, dwarf2_cu *cu)
11013 : m_die (die), m_cu (cu)
11015 /* We should only be processing DIEs not already in process. */
11016 gdb_assert (!m_die->in_process);
11017 m_die->in_process = true;
11020 ~process_die_scope ()
11022 m_die->in_process = false;
11024 /* If we're done processing the DIE for the CU that owns the line
11025 header, we don't need the line header anymore. */
11026 if (m_cu->line_header_die_owner == m_die)
11028 delete m_cu->line_header;
11029 m_cu->line_header = NULL;
11030 m_cu->line_header_die_owner = NULL;
11039 /* Process a die and its children. */
11042 process_die (struct die_info *die, struct dwarf2_cu *cu)
11044 process_die_scope scope (die, cu);
11048 case DW_TAG_padding:
11050 case DW_TAG_compile_unit:
11051 case DW_TAG_partial_unit:
11052 read_file_scope (die, cu);
11054 case DW_TAG_type_unit:
11055 read_type_unit_scope (die, cu);
11057 case DW_TAG_subprogram:
11058 case DW_TAG_inlined_subroutine:
11059 read_func_scope (die, cu);
11061 case DW_TAG_lexical_block:
11062 case DW_TAG_try_block:
11063 case DW_TAG_catch_block:
11064 read_lexical_block_scope (die, cu);
11066 case DW_TAG_call_site:
11067 case DW_TAG_GNU_call_site:
11068 read_call_site_scope (die, cu);
11070 case DW_TAG_class_type:
11071 case DW_TAG_interface_type:
11072 case DW_TAG_structure_type:
11073 case DW_TAG_union_type:
11074 process_structure_scope (die, cu);
11076 case DW_TAG_enumeration_type:
11077 process_enumeration_scope (die, cu);
11080 /* These dies have a type, but processing them does not create
11081 a symbol or recurse to process the children. Therefore we can
11082 read them on-demand through read_type_die. */
11083 case DW_TAG_subroutine_type:
11084 case DW_TAG_set_type:
11085 case DW_TAG_array_type:
11086 case DW_TAG_pointer_type:
11087 case DW_TAG_ptr_to_member_type:
11088 case DW_TAG_reference_type:
11089 case DW_TAG_rvalue_reference_type:
11090 case DW_TAG_string_type:
11093 case DW_TAG_base_type:
11094 case DW_TAG_subrange_type:
11095 case DW_TAG_typedef:
11096 /* Add a typedef symbol for the type definition, if it has a
11098 new_symbol (die, read_type_die (die, cu), cu);
11100 case DW_TAG_common_block:
11101 read_common_block (die, cu);
11103 case DW_TAG_common_inclusion:
11105 case DW_TAG_namespace:
11106 cu->processing_has_namespace_info = 1;
11107 read_namespace (die, cu);
11109 case DW_TAG_module:
11110 cu->processing_has_namespace_info = 1;
11111 read_module (die, cu);
11113 case DW_TAG_imported_declaration:
11114 cu->processing_has_namespace_info = 1;
11115 if (read_namespace_alias (die, cu))
11117 /* The declaration is not a global namespace alias: fall through. */
11118 case DW_TAG_imported_module:
11119 cu->processing_has_namespace_info = 1;
11120 if (die->child != NULL && (die->tag == DW_TAG_imported_declaration
11121 || cu->language != language_fortran))
11122 complaint (&symfile_complaints, _("Tag '%s' has unexpected children"),
11123 dwarf_tag_name (die->tag));
11124 read_import_statement (die, cu);
11127 case DW_TAG_imported_unit:
11128 process_imported_unit_die (die, cu);
11131 case DW_TAG_variable:
11132 read_variable (die, cu);
11136 new_symbol (die, NULL, cu);
11141 /* DWARF name computation. */
11143 /* A helper function for dwarf2_compute_name which determines whether DIE
11144 needs to have the name of the scope prepended to the name listed in the
11148 die_needs_namespace (struct die_info *die, struct dwarf2_cu *cu)
11150 struct attribute *attr;
11154 case DW_TAG_namespace:
11155 case DW_TAG_typedef:
11156 case DW_TAG_class_type:
11157 case DW_TAG_interface_type:
11158 case DW_TAG_structure_type:
11159 case DW_TAG_union_type:
11160 case DW_TAG_enumeration_type:
11161 case DW_TAG_enumerator:
11162 case DW_TAG_subprogram:
11163 case DW_TAG_inlined_subroutine:
11164 case DW_TAG_member:
11165 case DW_TAG_imported_declaration:
11168 case DW_TAG_variable:
11169 case DW_TAG_constant:
11170 /* We only need to prefix "globally" visible variables. These include
11171 any variable marked with DW_AT_external or any variable that
11172 lives in a namespace. [Variables in anonymous namespaces
11173 require prefixing, but they are not DW_AT_external.] */
11175 if (dwarf2_attr (die, DW_AT_specification, cu))
11177 struct dwarf2_cu *spec_cu = cu;
11179 return die_needs_namespace (die_specification (die, &spec_cu),
11183 attr = dwarf2_attr (die, DW_AT_external, cu);
11184 if (attr == NULL && die->parent->tag != DW_TAG_namespace
11185 && die->parent->tag != DW_TAG_module)
11187 /* A variable in a lexical block of some kind does not need a
11188 namespace, even though in C++ such variables may be external
11189 and have a mangled name. */
11190 if (die->parent->tag == DW_TAG_lexical_block
11191 || die->parent->tag == DW_TAG_try_block
11192 || die->parent->tag == DW_TAG_catch_block
11193 || die->parent->tag == DW_TAG_subprogram)
11202 /* Return the DIE's linkage name attribute, either DW_AT_linkage_name
11203 or DW_AT_MIPS_linkage_name. Returns NULL if the attribute is not
11204 defined for the given DIE. */
11206 static struct attribute *
11207 dw2_linkage_name_attr (struct die_info *die, struct dwarf2_cu *cu)
11209 struct attribute *attr;
11211 attr = dwarf2_attr (die, DW_AT_linkage_name, cu);
11213 attr = dwarf2_attr (die, DW_AT_MIPS_linkage_name, cu);
11218 /* Return the DIE's linkage name as a string, either DW_AT_linkage_name
11219 or DW_AT_MIPS_linkage_name. Returns NULL if the attribute is not
11220 defined for the given DIE. */
11222 static const char *
11223 dw2_linkage_name (struct die_info *die, struct dwarf2_cu *cu)
11225 const char *linkage_name;
11227 linkage_name = dwarf2_string_attr (die, DW_AT_linkage_name, cu);
11228 if (linkage_name == NULL)
11229 linkage_name = dwarf2_string_attr (die, DW_AT_MIPS_linkage_name, cu);
11231 return linkage_name;
11234 /* Compute the fully qualified name of DIE in CU. If PHYSNAME is nonzero,
11235 compute the physname for the object, which include a method's:
11236 - formal parameters (C++),
11237 - receiver type (Go),
11239 The term "physname" is a bit confusing.
11240 For C++, for example, it is the demangled name.
11241 For Go, for example, it's the mangled name.
11243 For Ada, return the DIE's linkage name rather than the fully qualified
11244 name. PHYSNAME is ignored..
11246 The result is allocated on the objfile_obstack and canonicalized. */
11248 static const char *
11249 dwarf2_compute_name (const char *name,
11250 struct die_info *die, struct dwarf2_cu *cu,
11253 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
11256 name = dwarf2_name (die, cu);
11258 /* For Fortran GDB prefers DW_AT_*linkage_name for the physname if present
11259 but otherwise compute it by typename_concat inside GDB.
11260 FIXME: Actually this is not really true, or at least not always true.
11261 It's all very confusing. SYMBOL_SET_NAMES doesn't try to demangle
11262 Fortran names because there is no mangling standard. So new_symbol
11263 will set the demangled name to the result of dwarf2_full_name, and it is
11264 the demangled name that GDB uses if it exists. */
11265 if (cu->language == language_ada
11266 || (cu->language == language_fortran && physname))
11268 /* For Ada unit, we prefer the linkage name over the name, as
11269 the former contains the exported name, which the user expects
11270 to be able to reference. Ideally, we want the user to be able
11271 to reference this entity using either natural or linkage name,
11272 but we haven't started looking at this enhancement yet. */
11273 const char *linkage_name = dw2_linkage_name (die, cu);
11275 if (linkage_name != NULL)
11276 return linkage_name;
11279 /* These are the only languages we know how to qualify names in. */
11281 && (cu->language == language_cplus
11282 || cu->language == language_fortran || cu->language == language_d
11283 || cu->language == language_rust))
11285 if (die_needs_namespace (die, cu))
11287 const char *prefix;
11288 const char *canonical_name = NULL;
11292 prefix = determine_prefix (die, cu);
11293 if (*prefix != '\0')
11295 char *prefixed_name = typename_concat (NULL, prefix, name,
11298 buf.puts (prefixed_name);
11299 xfree (prefixed_name);
11304 /* Template parameters may be specified in the DIE's DW_AT_name, or
11305 as children with DW_TAG_template_type_param or
11306 DW_TAG_value_type_param. If the latter, add them to the name
11307 here. If the name already has template parameters, then
11308 skip this step; some versions of GCC emit both, and
11309 it is more efficient to use the pre-computed name.
11311 Something to keep in mind about this process: it is very
11312 unlikely, or in some cases downright impossible, to produce
11313 something that will match the mangled name of a function.
11314 If the definition of the function has the same debug info,
11315 we should be able to match up with it anyway. But fallbacks
11316 using the minimal symbol, for instance to find a method
11317 implemented in a stripped copy of libstdc++, will not work.
11318 If we do not have debug info for the definition, we will have to
11319 match them up some other way.
11321 When we do name matching there is a related problem with function
11322 templates; two instantiated function templates are allowed to
11323 differ only by their return types, which we do not add here. */
11325 if (cu->language == language_cplus && strchr (name, '<') == NULL)
11327 struct attribute *attr;
11328 struct die_info *child;
11331 die->building_fullname = 1;
11333 for (child = die->child; child != NULL; child = child->sibling)
11337 const gdb_byte *bytes;
11338 struct dwarf2_locexpr_baton *baton;
11341 if (child->tag != DW_TAG_template_type_param
11342 && child->tag != DW_TAG_template_value_param)
11353 attr = dwarf2_attr (child, DW_AT_type, cu);
11356 complaint (&symfile_complaints,
11357 _("template parameter missing DW_AT_type"));
11358 buf.puts ("UNKNOWN_TYPE");
11361 type = die_type (child, cu);
11363 if (child->tag == DW_TAG_template_type_param)
11365 c_print_type (type, "", &buf, -1, 0, &type_print_raw_options);
11369 attr = dwarf2_attr (child, DW_AT_const_value, cu);
11372 complaint (&symfile_complaints,
11373 _("template parameter missing "
11374 "DW_AT_const_value"));
11375 buf.puts ("UNKNOWN_VALUE");
11379 dwarf2_const_value_attr (attr, type, name,
11380 &cu->comp_unit_obstack, cu,
11381 &value, &bytes, &baton);
11383 if (TYPE_NOSIGN (type))
11384 /* GDB prints characters as NUMBER 'CHAR'. If that's
11385 changed, this can use value_print instead. */
11386 c_printchar (value, type, &buf);
11389 struct value_print_options opts;
11392 v = dwarf2_evaluate_loc_desc (type, NULL,
11396 else if (bytes != NULL)
11398 v = allocate_value (type);
11399 memcpy (value_contents_writeable (v), bytes,
11400 TYPE_LENGTH (type));
11403 v = value_from_longest (type, value);
11405 /* Specify decimal so that we do not depend on
11407 get_formatted_print_options (&opts, 'd');
11409 value_print (v, &buf, &opts);
11415 die->building_fullname = 0;
11419 /* Close the argument list, with a space if necessary
11420 (nested templates). */
11421 if (!buf.empty () && buf.string ().back () == '>')
11428 /* For C++ methods, append formal parameter type
11429 information, if PHYSNAME. */
11431 if (physname && die->tag == DW_TAG_subprogram
11432 && cu->language == language_cplus)
11434 struct type *type = read_type_die (die, cu);
11436 c_type_print_args (type, &buf, 1, cu->language,
11437 &type_print_raw_options);
11439 if (cu->language == language_cplus)
11441 /* Assume that an artificial first parameter is
11442 "this", but do not crash if it is not. RealView
11443 marks unnamed (and thus unused) parameters as
11444 artificial; there is no way to differentiate
11446 if (TYPE_NFIELDS (type) > 0
11447 && TYPE_FIELD_ARTIFICIAL (type, 0)
11448 && TYPE_CODE (TYPE_FIELD_TYPE (type, 0)) == TYPE_CODE_PTR
11449 && TYPE_CONST (TYPE_TARGET_TYPE (TYPE_FIELD_TYPE (type,
11451 buf.puts (" const");
11455 const std::string &intermediate_name = buf.string ();
11457 if (cu->language == language_cplus)
11459 = dwarf2_canonicalize_name (intermediate_name.c_str (), cu,
11460 &objfile->per_bfd->storage_obstack);
11462 /* If we only computed INTERMEDIATE_NAME, or if
11463 INTERMEDIATE_NAME is already canonical, then we need to
11464 copy it to the appropriate obstack. */
11465 if (canonical_name == NULL || canonical_name == intermediate_name.c_str ())
11466 name = ((const char *)
11467 obstack_copy0 (&objfile->per_bfd->storage_obstack,
11468 intermediate_name.c_str (),
11469 intermediate_name.length ()));
11471 name = canonical_name;
11478 /* Return the fully qualified name of DIE, based on its DW_AT_name.
11479 If scope qualifiers are appropriate they will be added. The result
11480 will be allocated on the storage_obstack, or NULL if the DIE does
11481 not have a name. NAME may either be from a previous call to
11482 dwarf2_name or NULL.
11484 The output string will be canonicalized (if C++). */
11486 static const char *
11487 dwarf2_full_name (const char *name, struct die_info *die, struct dwarf2_cu *cu)
11489 return dwarf2_compute_name (name, die, cu, 0);
11492 /* Construct a physname for the given DIE in CU. NAME may either be
11493 from a previous call to dwarf2_name or NULL. The result will be
11494 allocated on the objfile_objstack or NULL if the DIE does not have a
11497 The output string will be canonicalized (if C++). */
11499 static const char *
11500 dwarf2_physname (const char *name, struct die_info *die, struct dwarf2_cu *cu)
11502 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
11503 const char *retval, *mangled = NULL, *canon = NULL;
11506 /* In this case dwarf2_compute_name is just a shortcut not building anything
11508 if (!die_needs_namespace (die, cu))
11509 return dwarf2_compute_name (name, die, cu, 1);
11511 mangled = dw2_linkage_name (die, cu);
11513 /* rustc emits invalid values for DW_AT_linkage_name. Ignore these.
11514 See https://github.com/rust-lang/rust/issues/32925. */
11515 if (cu->language == language_rust && mangled != NULL
11516 && strchr (mangled, '{') != NULL)
11519 /* DW_AT_linkage_name is missing in some cases - depend on what GDB
11521 gdb::unique_xmalloc_ptr<char> demangled;
11522 if (mangled != NULL)
11525 if (cu->language == language_go)
11527 /* This is a lie, but we already lie to the caller new_symbol.
11528 new_symbol assumes we return the mangled name.
11529 This just undoes that lie until things are cleaned up. */
11533 /* Use DMGL_RET_DROP for C++ template functions to suppress
11534 their return type. It is easier for GDB users to search
11535 for such functions as `name(params)' than `long name(params)'.
11536 In such case the minimal symbol names do not match the full
11537 symbol names but for template functions there is never a need
11538 to look up their definition from their declaration so
11539 the only disadvantage remains the minimal symbol variant
11540 `long name(params)' does not have the proper inferior type. */
11541 demangled.reset (gdb_demangle (mangled,
11542 (DMGL_PARAMS | DMGL_ANSI
11543 | DMGL_RET_DROP)));
11546 canon = demangled.get ();
11554 if (canon == NULL || check_physname)
11556 const char *physname = dwarf2_compute_name (name, die, cu, 1);
11558 if (canon != NULL && strcmp (physname, canon) != 0)
11560 /* It may not mean a bug in GDB. The compiler could also
11561 compute DW_AT_linkage_name incorrectly. But in such case
11562 GDB would need to be bug-to-bug compatible. */
11564 complaint (&symfile_complaints,
11565 _("Computed physname <%s> does not match demangled <%s> "
11566 "(from linkage <%s>) - DIE at %s [in module %s]"),
11567 physname, canon, mangled, sect_offset_str (die->sect_off),
11568 objfile_name (objfile));
11570 /* Prefer DW_AT_linkage_name (in the CANON form) - when it
11571 is available here - over computed PHYSNAME. It is safer
11572 against both buggy GDB and buggy compilers. */
11586 retval = ((const char *)
11587 obstack_copy0 (&objfile->per_bfd->storage_obstack,
11588 retval, strlen (retval)));
11593 /* Inspect DIE in CU for a namespace alias. If one exists, record
11594 a new symbol for it.
11596 Returns 1 if a namespace alias was recorded, 0 otherwise. */
11599 read_namespace_alias (struct die_info *die, struct dwarf2_cu *cu)
11601 struct attribute *attr;
11603 /* If the die does not have a name, this is not a namespace
11605 attr = dwarf2_attr (die, DW_AT_name, cu);
11609 struct die_info *d = die;
11610 struct dwarf2_cu *imported_cu = cu;
11612 /* If the compiler has nested DW_AT_imported_declaration DIEs,
11613 keep inspecting DIEs until we hit the underlying import. */
11614 #define MAX_NESTED_IMPORTED_DECLARATIONS 100
11615 for (num = 0; num < MAX_NESTED_IMPORTED_DECLARATIONS; ++num)
11617 attr = dwarf2_attr (d, DW_AT_import, cu);
11621 d = follow_die_ref (d, attr, &imported_cu);
11622 if (d->tag != DW_TAG_imported_declaration)
11626 if (num == MAX_NESTED_IMPORTED_DECLARATIONS)
11628 complaint (&symfile_complaints,
11629 _("DIE at %s has too many recursively imported "
11630 "declarations"), sect_offset_str (d->sect_off));
11637 sect_offset sect_off = dwarf2_get_ref_die_offset (attr);
11639 type = get_die_type_at_offset (sect_off, cu->per_cu);
11640 if (type != NULL && TYPE_CODE (type) == TYPE_CODE_NAMESPACE)
11642 /* This declaration is a global namespace alias. Add
11643 a symbol for it whose type is the aliased namespace. */
11644 new_symbol (die, type, cu);
11653 /* Return the using directives repository (global or local?) to use in the
11654 current context for LANGUAGE.
11656 For Ada, imported declarations can materialize renamings, which *may* be
11657 global. However it is impossible (for now?) in DWARF to distinguish
11658 "external" imported declarations and "static" ones. As all imported
11659 declarations seem to be static in all other languages, make them all CU-wide
11660 global only in Ada. */
11662 static struct using_direct **
11663 using_directives (enum language language)
11665 if (language == language_ada && context_stack_depth == 0)
11666 return &global_using_directives;
11668 return &local_using_directives;
11671 /* Read the import statement specified by the given die and record it. */
11674 read_import_statement (struct die_info *die, struct dwarf2_cu *cu)
11676 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
11677 struct attribute *import_attr;
11678 struct die_info *imported_die, *child_die;
11679 struct dwarf2_cu *imported_cu;
11680 const char *imported_name;
11681 const char *imported_name_prefix;
11682 const char *canonical_name;
11683 const char *import_alias;
11684 const char *imported_declaration = NULL;
11685 const char *import_prefix;
11686 std::vector<const char *> excludes;
11688 import_attr = dwarf2_attr (die, DW_AT_import, cu);
11689 if (import_attr == NULL)
11691 complaint (&symfile_complaints, _("Tag '%s' has no DW_AT_import"),
11692 dwarf_tag_name (die->tag));
11697 imported_die = follow_die_ref_or_sig (die, import_attr, &imported_cu);
11698 imported_name = dwarf2_name (imported_die, imported_cu);
11699 if (imported_name == NULL)
11701 /* GCC bug: https://bugzilla.redhat.com/show_bug.cgi?id=506524
11703 The import in the following code:
11717 <2><51>: Abbrev Number: 3 (DW_TAG_imported_declaration)
11718 <52> DW_AT_decl_file : 1
11719 <53> DW_AT_decl_line : 6
11720 <54> DW_AT_import : <0x75>
11721 <2><58>: Abbrev Number: 4 (DW_TAG_typedef)
11722 <59> DW_AT_name : B
11723 <5b> DW_AT_decl_file : 1
11724 <5c> DW_AT_decl_line : 2
11725 <5d> DW_AT_type : <0x6e>
11727 <1><75>: Abbrev Number: 7 (DW_TAG_base_type)
11728 <76> DW_AT_byte_size : 4
11729 <77> DW_AT_encoding : 5 (signed)
11731 imports the wrong die ( 0x75 instead of 0x58 ).
11732 This case will be ignored until the gcc bug is fixed. */
11736 /* Figure out the local name after import. */
11737 import_alias = dwarf2_name (die, cu);
11739 /* Figure out where the statement is being imported to. */
11740 import_prefix = determine_prefix (die, cu);
11742 /* Figure out what the scope of the imported die is and prepend it
11743 to the name of the imported die. */
11744 imported_name_prefix = determine_prefix (imported_die, imported_cu);
11746 if (imported_die->tag != DW_TAG_namespace
11747 && imported_die->tag != DW_TAG_module)
11749 imported_declaration = imported_name;
11750 canonical_name = imported_name_prefix;
11752 else if (strlen (imported_name_prefix) > 0)
11753 canonical_name = obconcat (&objfile->objfile_obstack,
11754 imported_name_prefix,
11755 (cu->language == language_d ? "." : "::"),
11756 imported_name, (char *) NULL);
11758 canonical_name = imported_name;
11760 if (die->tag == DW_TAG_imported_module && cu->language == language_fortran)
11761 for (child_die = die->child; child_die && child_die->tag;
11762 child_die = sibling_die (child_die))
11764 /* DWARF-4: A Fortran use statement with a “rename list” may be
11765 represented by an imported module entry with an import attribute
11766 referring to the module and owned entries corresponding to those
11767 entities that are renamed as part of being imported. */
11769 if (child_die->tag != DW_TAG_imported_declaration)
11771 complaint (&symfile_complaints,
11772 _("child DW_TAG_imported_declaration expected "
11773 "- DIE at %s [in module %s]"),
11774 sect_offset_str (child_die->sect_off),
11775 objfile_name (objfile));
11779 import_attr = dwarf2_attr (child_die, DW_AT_import, cu);
11780 if (import_attr == NULL)
11782 complaint (&symfile_complaints, _("Tag '%s' has no DW_AT_import"),
11783 dwarf_tag_name (child_die->tag));
11788 imported_die = follow_die_ref_or_sig (child_die, import_attr,
11790 imported_name = dwarf2_name (imported_die, imported_cu);
11791 if (imported_name == NULL)
11793 complaint (&symfile_complaints,
11794 _("child DW_TAG_imported_declaration has unknown "
11795 "imported name - DIE at %s [in module %s]"),
11796 sect_offset_str (child_die->sect_off),
11797 objfile_name (objfile));
11801 excludes.push_back (imported_name);
11803 process_die (child_die, cu);
11806 add_using_directive (using_directives (cu->language),
11810 imported_declaration,
11813 &objfile->objfile_obstack);
11816 /* ICC<14 does not output the required DW_AT_declaration on incomplete
11817 types, but gives them a size of zero. Starting with version 14,
11818 ICC is compatible with GCC. */
11821 producer_is_icc_lt_14 (struct dwarf2_cu *cu)
11823 if (!cu->checked_producer)
11824 check_producer (cu);
11826 return cu->producer_is_icc_lt_14;
11829 /* Check for possibly missing DW_AT_comp_dir with relative .debug_line
11830 directory paths. GCC SVN r127613 (new option -fdebug-prefix-map) fixed
11831 this, it was first present in GCC release 4.3.0. */
11834 producer_is_gcc_lt_4_3 (struct dwarf2_cu *cu)
11836 if (!cu->checked_producer)
11837 check_producer (cu);
11839 return cu->producer_is_gcc_lt_4_3;
11842 static file_and_directory
11843 find_file_and_directory (struct die_info *die, struct dwarf2_cu *cu)
11845 file_and_directory res;
11847 /* Find the filename. Do not use dwarf2_name here, since the filename
11848 is not a source language identifier. */
11849 res.name = dwarf2_string_attr (die, DW_AT_name, cu);
11850 res.comp_dir = dwarf2_string_attr (die, DW_AT_comp_dir, cu);
11852 if (res.comp_dir == NULL
11853 && producer_is_gcc_lt_4_3 (cu) && res.name != NULL
11854 && IS_ABSOLUTE_PATH (res.name))
11856 res.comp_dir_storage = ldirname (res.name);
11857 if (!res.comp_dir_storage.empty ())
11858 res.comp_dir = res.comp_dir_storage.c_str ();
11860 if (res.comp_dir != NULL)
11862 /* Irix 6.2 native cc prepends <machine>.: to the compilation
11863 directory, get rid of it. */
11864 const char *cp = strchr (res.comp_dir, ':');
11866 if (cp && cp != res.comp_dir && cp[-1] == '.' && cp[1] == '/')
11867 res.comp_dir = cp + 1;
11870 if (res.name == NULL)
11871 res.name = "<unknown>";
11876 /* Handle DW_AT_stmt_list for a compilation unit.
11877 DIE is the DW_TAG_compile_unit die for CU.
11878 COMP_DIR is the compilation directory. LOWPC is passed to
11879 dwarf_decode_lines. See dwarf_decode_lines comments about it. */
11882 handle_DW_AT_stmt_list (struct die_info *die, struct dwarf2_cu *cu,
11883 const char *comp_dir, CORE_ADDR lowpc) /* ARI: editCase function */
11885 struct dwarf2_per_objfile *dwarf2_per_objfile
11886 = cu->per_cu->dwarf2_per_objfile;
11887 struct objfile *objfile = dwarf2_per_objfile->objfile;
11888 struct attribute *attr;
11889 struct line_header line_header_local;
11890 hashval_t line_header_local_hash;
11892 int decode_mapping;
11894 gdb_assert (! cu->per_cu->is_debug_types);
11896 attr = dwarf2_attr (die, DW_AT_stmt_list, cu);
11900 sect_offset line_offset = (sect_offset) DW_UNSND (attr);
11902 /* The line header hash table is only created if needed (it exists to
11903 prevent redundant reading of the line table for partial_units).
11904 If we're given a partial_unit, we'll need it. If we're given a
11905 compile_unit, then use the line header hash table if it's already
11906 created, but don't create one just yet. */
11908 if (dwarf2_per_objfile->line_header_hash == NULL
11909 && die->tag == DW_TAG_partial_unit)
11911 dwarf2_per_objfile->line_header_hash
11912 = htab_create_alloc_ex (127, line_header_hash_voidp,
11913 line_header_eq_voidp,
11914 free_line_header_voidp,
11915 &objfile->objfile_obstack,
11916 hashtab_obstack_allocate,
11917 dummy_obstack_deallocate);
11920 line_header_local.sect_off = line_offset;
11921 line_header_local.offset_in_dwz = cu->per_cu->is_dwz;
11922 line_header_local_hash = line_header_hash (&line_header_local);
11923 if (dwarf2_per_objfile->line_header_hash != NULL)
11925 slot = htab_find_slot_with_hash (dwarf2_per_objfile->line_header_hash,
11926 &line_header_local,
11927 line_header_local_hash, NO_INSERT);
11929 /* For DW_TAG_compile_unit we need info like symtab::linetable which
11930 is not present in *SLOT (since if there is something in *SLOT then
11931 it will be for a partial_unit). */
11932 if (die->tag == DW_TAG_partial_unit && slot != NULL)
11934 gdb_assert (*slot != NULL);
11935 cu->line_header = (struct line_header *) *slot;
11940 /* dwarf_decode_line_header does not yet provide sufficient information.
11941 We always have to call also dwarf_decode_lines for it. */
11942 line_header_up lh = dwarf_decode_line_header (line_offset, cu);
11946 cu->line_header = lh.release ();
11947 cu->line_header_die_owner = die;
11949 if (dwarf2_per_objfile->line_header_hash == NULL)
11953 slot = htab_find_slot_with_hash (dwarf2_per_objfile->line_header_hash,
11954 &line_header_local,
11955 line_header_local_hash, INSERT);
11956 gdb_assert (slot != NULL);
11958 if (slot != NULL && *slot == NULL)
11960 /* This newly decoded line number information unit will be owned
11961 by line_header_hash hash table. */
11962 *slot = cu->line_header;
11963 cu->line_header_die_owner = NULL;
11967 /* We cannot free any current entry in (*slot) as that struct line_header
11968 may be already used by multiple CUs. Create only temporary decoded
11969 line_header for this CU - it may happen at most once for each line
11970 number information unit. And if we're not using line_header_hash
11971 then this is what we want as well. */
11972 gdb_assert (die->tag != DW_TAG_partial_unit);
11974 decode_mapping = (die->tag != DW_TAG_partial_unit);
11975 dwarf_decode_lines (cu->line_header, comp_dir, cu, NULL, lowpc,
11980 /* Process DW_TAG_compile_unit or DW_TAG_partial_unit. */
11983 read_file_scope (struct die_info *die, struct dwarf2_cu *cu)
11985 struct dwarf2_per_objfile *dwarf2_per_objfile
11986 = cu->per_cu->dwarf2_per_objfile;
11987 struct objfile *objfile = dwarf2_per_objfile->objfile;
11988 struct gdbarch *gdbarch = get_objfile_arch (objfile);
11989 CORE_ADDR lowpc = ((CORE_ADDR) -1);
11990 CORE_ADDR highpc = ((CORE_ADDR) 0);
11991 struct attribute *attr;
11992 struct die_info *child_die;
11993 CORE_ADDR baseaddr;
11995 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
11997 get_scope_pc_bounds (die, &lowpc, &highpc, cu);
11999 /* If we didn't find a lowpc, set it to highpc to avoid complaints
12000 from finish_block. */
12001 if (lowpc == ((CORE_ADDR) -1))
12003 lowpc = gdbarch_adjust_dwarf2_addr (gdbarch, lowpc + baseaddr);
12005 file_and_directory fnd = find_file_and_directory (die, cu);
12007 prepare_one_comp_unit (cu, die, cu->language);
12009 /* The XLCL doesn't generate DW_LANG_OpenCL because this attribute is not
12010 standardised yet. As a workaround for the language detection we fall
12011 back to the DW_AT_producer string. */
12012 if (cu->producer && strstr (cu->producer, "IBM XL C for OpenCL") != NULL)
12013 cu->language = language_opencl;
12015 /* Similar hack for Go. */
12016 if (cu->producer && strstr (cu->producer, "GNU Go ") != NULL)
12017 set_cu_language (DW_LANG_Go, cu);
12019 dwarf2_start_symtab (cu, fnd.name, fnd.comp_dir, lowpc);
12021 /* Decode line number information if present. We do this before
12022 processing child DIEs, so that the line header table is available
12023 for DW_AT_decl_file. */
12024 handle_DW_AT_stmt_list (die, cu, fnd.comp_dir, lowpc);
12026 /* Process all dies in compilation unit. */
12027 if (die->child != NULL)
12029 child_die = die->child;
12030 while (child_die && child_die->tag)
12032 process_die (child_die, cu);
12033 child_die = sibling_die (child_die);
12037 /* Decode macro information, if present. Dwarf 2 macro information
12038 refers to information in the line number info statement program
12039 header, so we can only read it if we've read the header
12041 attr = dwarf2_attr (die, DW_AT_macros, cu);
12043 attr = dwarf2_attr (die, DW_AT_GNU_macros, cu);
12044 if (attr && cu->line_header)
12046 if (dwarf2_attr (die, DW_AT_macro_info, cu))
12047 complaint (&symfile_complaints,
12048 _("CU refers to both DW_AT_macros and DW_AT_macro_info"));
12050 dwarf_decode_macros (cu, DW_UNSND (attr), 1);
12054 attr = dwarf2_attr (die, DW_AT_macro_info, cu);
12055 if (attr && cu->line_header)
12057 unsigned int macro_offset = DW_UNSND (attr);
12059 dwarf_decode_macros (cu, macro_offset, 0);
12064 /* TU version of handle_DW_AT_stmt_list for read_type_unit_scope.
12065 Create the set of symtabs used by this TU, or if this TU is sharing
12066 symtabs with another TU and the symtabs have already been created
12067 then restore those symtabs in the line header.
12068 We don't need the pc/line-number mapping for type units. */
12071 setup_type_unit_groups (struct die_info *die, struct dwarf2_cu *cu)
12073 struct dwarf2_per_cu_data *per_cu = cu->per_cu;
12074 struct type_unit_group *tu_group;
12076 struct attribute *attr;
12078 struct signatured_type *sig_type;
12080 gdb_assert (per_cu->is_debug_types);
12081 sig_type = (struct signatured_type *) per_cu;
12083 attr = dwarf2_attr (die, DW_AT_stmt_list, cu);
12085 /* If we're using .gdb_index (includes -readnow) then
12086 per_cu->type_unit_group may not have been set up yet. */
12087 if (sig_type->type_unit_group == NULL)
12088 sig_type->type_unit_group = get_type_unit_group (cu, attr);
12089 tu_group = sig_type->type_unit_group;
12091 /* If we've already processed this stmt_list there's no real need to
12092 do it again, we could fake it and just recreate the part we need
12093 (file name,index -> symtab mapping). If data shows this optimization
12094 is useful we can do it then. */
12095 first_time = tu_group->compunit_symtab == NULL;
12097 /* We have to handle the case of both a missing DW_AT_stmt_list or bad
12102 sect_offset line_offset = (sect_offset) DW_UNSND (attr);
12103 lh = dwarf_decode_line_header (line_offset, cu);
12108 dwarf2_start_symtab (cu, "", NULL, 0);
12111 gdb_assert (tu_group->symtabs == NULL);
12112 restart_symtab (tu_group->compunit_symtab, "", 0);
12117 cu->line_header = lh.release ();
12118 cu->line_header_die_owner = die;
12122 struct compunit_symtab *cust = dwarf2_start_symtab (cu, "", NULL, 0);
12124 /* Note: We don't assign tu_group->compunit_symtab yet because we're
12125 still initializing it, and our caller (a few levels up)
12126 process_full_type_unit still needs to know if this is the first
12129 tu_group->num_symtabs = cu->line_header->file_names.size ();
12130 tu_group->symtabs = XNEWVEC (struct symtab *,
12131 cu->line_header->file_names.size ());
12133 for (i = 0; i < cu->line_header->file_names.size (); ++i)
12135 file_entry &fe = cu->line_header->file_names[i];
12137 dwarf2_start_subfile (fe.name, fe.include_dir (cu->line_header));
12139 if (current_subfile->symtab == NULL)
12141 /* NOTE: start_subfile will recognize when it's been
12142 passed a file it has already seen. So we can't
12143 assume there's a simple mapping from
12144 cu->line_header->file_names to subfiles, plus
12145 cu->line_header->file_names may contain dups. */
12146 current_subfile->symtab
12147 = allocate_symtab (cust, current_subfile->name);
12150 fe.symtab = current_subfile->symtab;
12151 tu_group->symtabs[i] = fe.symtab;
12156 restart_symtab (tu_group->compunit_symtab, "", 0);
12158 for (i = 0; i < cu->line_header->file_names.size (); ++i)
12160 file_entry &fe = cu->line_header->file_names[i];
12162 fe.symtab = tu_group->symtabs[i];
12166 /* The main symtab is allocated last. Type units don't have DW_AT_name
12167 so they don't have a "real" (so to speak) symtab anyway.
12168 There is later code that will assign the main symtab to all symbols
12169 that don't have one. We need to handle the case of a symbol with a
12170 missing symtab (DW_AT_decl_file) anyway. */
12173 /* Process DW_TAG_type_unit.
12174 For TUs we want to skip the first top level sibling if it's not the
12175 actual type being defined by this TU. In this case the first top
12176 level sibling is there to provide context only. */
12179 read_type_unit_scope (struct die_info *die, struct dwarf2_cu *cu)
12181 struct die_info *child_die;
12183 prepare_one_comp_unit (cu, die, language_minimal);
12185 /* Initialize (or reinitialize) the machinery for building symtabs.
12186 We do this before processing child DIEs, so that the line header table
12187 is available for DW_AT_decl_file. */
12188 setup_type_unit_groups (die, cu);
12190 if (die->child != NULL)
12192 child_die = die->child;
12193 while (child_die && child_die->tag)
12195 process_die (child_die, cu);
12196 child_die = sibling_die (child_die);
12203 http://gcc.gnu.org/wiki/DebugFission
12204 http://gcc.gnu.org/wiki/DebugFissionDWP
12206 To simplify handling of both DWO files ("object" files with the DWARF info)
12207 and DWP files (a file with the DWOs packaged up into one file), we treat
12208 DWP files as having a collection of virtual DWO files. */
12211 hash_dwo_file (const void *item)
12213 const struct dwo_file *dwo_file = (const struct dwo_file *) item;
12216 hash = htab_hash_string (dwo_file->dwo_name);
12217 if (dwo_file->comp_dir != NULL)
12218 hash += htab_hash_string (dwo_file->comp_dir);
12223 eq_dwo_file (const void *item_lhs, const void *item_rhs)
12225 const struct dwo_file *lhs = (const struct dwo_file *) item_lhs;
12226 const struct dwo_file *rhs = (const struct dwo_file *) item_rhs;
12228 if (strcmp (lhs->dwo_name, rhs->dwo_name) != 0)
12230 if (lhs->comp_dir == NULL || rhs->comp_dir == NULL)
12231 return lhs->comp_dir == rhs->comp_dir;
12232 return strcmp (lhs->comp_dir, rhs->comp_dir) == 0;
12235 /* Allocate a hash table for DWO files. */
12238 allocate_dwo_file_hash_table (struct objfile *objfile)
12240 return htab_create_alloc_ex (41,
12244 &objfile->objfile_obstack,
12245 hashtab_obstack_allocate,
12246 dummy_obstack_deallocate);
12249 /* Lookup DWO file DWO_NAME. */
12252 lookup_dwo_file_slot (struct dwarf2_per_objfile *dwarf2_per_objfile,
12253 const char *dwo_name,
12254 const char *comp_dir)
12256 struct dwo_file find_entry;
12259 if (dwarf2_per_objfile->dwo_files == NULL)
12260 dwarf2_per_objfile->dwo_files
12261 = allocate_dwo_file_hash_table (dwarf2_per_objfile->objfile);
12263 memset (&find_entry, 0, sizeof (find_entry));
12264 find_entry.dwo_name = dwo_name;
12265 find_entry.comp_dir = comp_dir;
12266 slot = htab_find_slot (dwarf2_per_objfile->dwo_files, &find_entry, INSERT);
12272 hash_dwo_unit (const void *item)
12274 const struct dwo_unit *dwo_unit = (const struct dwo_unit *) item;
12276 /* This drops the top 32 bits of the id, but is ok for a hash. */
12277 return dwo_unit->signature;
12281 eq_dwo_unit (const void *item_lhs, const void *item_rhs)
12283 const struct dwo_unit *lhs = (const struct dwo_unit *) item_lhs;
12284 const struct dwo_unit *rhs = (const struct dwo_unit *) item_rhs;
12286 /* The signature is assumed to be unique within the DWO file.
12287 So while object file CU dwo_id's always have the value zero,
12288 that's OK, assuming each object file DWO file has only one CU,
12289 and that's the rule for now. */
12290 return lhs->signature == rhs->signature;
12293 /* Allocate a hash table for DWO CUs,TUs.
12294 There is one of these tables for each of CUs,TUs for each DWO file. */
12297 allocate_dwo_unit_table (struct objfile *objfile)
12299 /* Start out with a pretty small number.
12300 Generally DWO files contain only one CU and maybe some TUs. */
12301 return htab_create_alloc_ex (3,
12305 &objfile->objfile_obstack,
12306 hashtab_obstack_allocate,
12307 dummy_obstack_deallocate);
12310 /* Structure used to pass data to create_dwo_debug_info_hash_table_reader. */
12312 struct create_dwo_cu_data
12314 struct dwo_file *dwo_file;
12315 struct dwo_unit dwo_unit;
12318 /* die_reader_func for create_dwo_cu. */
12321 create_dwo_cu_reader (const struct die_reader_specs *reader,
12322 const gdb_byte *info_ptr,
12323 struct die_info *comp_unit_die,
12327 struct dwarf2_cu *cu = reader->cu;
12328 sect_offset sect_off = cu->per_cu->sect_off;
12329 struct dwarf2_section_info *section = cu->per_cu->section;
12330 struct create_dwo_cu_data *data = (struct create_dwo_cu_data *) datap;
12331 struct dwo_file *dwo_file = data->dwo_file;
12332 struct dwo_unit *dwo_unit = &data->dwo_unit;
12333 struct attribute *attr;
12335 attr = dwarf2_attr (comp_unit_die, DW_AT_GNU_dwo_id, cu);
12338 complaint (&symfile_complaints,
12339 _("Dwarf Error: debug entry at offset %s is missing"
12340 " its dwo_id [in module %s]"),
12341 sect_offset_str (sect_off), dwo_file->dwo_name);
12345 dwo_unit->dwo_file = dwo_file;
12346 dwo_unit->signature = DW_UNSND (attr);
12347 dwo_unit->section = section;
12348 dwo_unit->sect_off = sect_off;
12349 dwo_unit->length = cu->per_cu->length;
12351 if (dwarf_read_debug)
12352 fprintf_unfiltered (gdb_stdlog, " offset %s, dwo_id %s\n",
12353 sect_offset_str (sect_off),
12354 hex_string (dwo_unit->signature));
12357 /* Create the dwo_units for the CUs in a DWO_FILE.
12358 Note: This function processes DWO files only, not DWP files. */
12361 create_cus_hash_table (struct dwarf2_per_objfile *dwarf2_per_objfile,
12362 struct dwo_file &dwo_file, dwarf2_section_info §ion,
12365 struct objfile *objfile = dwarf2_per_objfile->objfile;
12366 const gdb_byte *info_ptr, *end_ptr;
12368 dwarf2_read_section (objfile, §ion);
12369 info_ptr = section.buffer;
12371 if (info_ptr == NULL)
12374 if (dwarf_read_debug)
12376 fprintf_unfiltered (gdb_stdlog, "Reading %s for %s:\n",
12377 get_section_name (§ion),
12378 get_section_file_name (§ion));
12381 end_ptr = info_ptr + section.size;
12382 while (info_ptr < end_ptr)
12384 struct dwarf2_per_cu_data per_cu;
12385 struct create_dwo_cu_data create_dwo_cu_data;
12386 struct dwo_unit *dwo_unit;
12388 sect_offset sect_off = (sect_offset) (info_ptr - section.buffer);
12390 memset (&create_dwo_cu_data.dwo_unit, 0,
12391 sizeof (create_dwo_cu_data.dwo_unit));
12392 memset (&per_cu, 0, sizeof (per_cu));
12393 per_cu.dwarf2_per_objfile = dwarf2_per_objfile;
12394 per_cu.is_debug_types = 0;
12395 per_cu.sect_off = sect_offset (info_ptr - section.buffer);
12396 per_cu.section = §ion;
12397 create_dwo_cu_data.dwo_file = &dwo_file;
12399 init_cutu_and_read_dies_no_follow (
12400 &per_cu, &dwo_file, create_dwo_cu_reader, &create_dwo_cu_data);
12401 info_ptr += per_cu.length;
12403 // If the unit could not be parsed, skip it.
12404 if (create_dwo_cu_data.dwo_unit.dwo_file == NULL)
12407 if (cus_htab == NULL)
12408 cus_htab = allocate_dwo_unit_table (objfile);
12410 dwo_unit = OBSTACK_ZALLOC (&objfile->objfile_obstack, struct dwo_unit);
12411 *dwo_unit = create_dwo_cu_data.dwo_unit;
12412 slot = htab_find_slot (cus_htab, dwo_unit, INSERT);
12413 gdb_assert (slot != NULL);
12416 const struct dwo_unit *dup_cu = (const struct dwo_unit *)*slot;
12417 sect_offset dup_sect_off = dup_cu->sect_off;
12419 complaint (&symfile_complaints,
12420 _("debug cu entry at offset %s is duplicate to"
12421 " the entry at offset %s, signature %s"),
12422 sect_offset_str (sect_off), sect_offset_str (dup_sect_off),
12423 hex_string (dwo_unit->signature));
12425 *slot = (void *)dwo_unit;
12429 /* DWP file .debug_{cu,tu}_index section format:
12430 [ref: http://gcc.gnu.org/wiki/DebugFissionDWP]
12434 Both index sections have the same format, and serve to map a 64-bit
12435 signature to a set of section numbers. Each section begins with a header,
12436 followed by a hash table of 64-bit signatures, a parallel table of 32-bit
12437 indexes, and a pool of 32-bit section numbers. The index sections will be
12438 aligned at 8-byte boundaries in the file.
12440 The index section header consists of:
12442 V, 32 bit version number
12444 N, 32 bit number of compilation units or type units in the index
12445 M, 32 bit number of slots in the hash table
12447 Numbers are recorded using the byte order of the application binary.
12449 The hash table begins at offset 16 in the section, and consists of an array
12450 of M 64-bit slots. Each slot contains a 64-bit signature (using the byte
12451 order of the application binary). Unused slots in the hash table are 0.
12452 (We rely on the extreme unlikeliness of a signature being exactly 0.)
12454 The parallel table begins immediately after the hash table
12455 (at offset 16 + 8 * M from the beginning of the section), and consists of an
12456 array of 32-bit indexes (using the byte order of the application binary),
12457 corresponding 1-1 with slots in the hash table. Each entry in the parallel
12458 table contains a 32-bit index into the pool of section numbers. For unused
12459 hash table slots, the corresponding entry in the parallel table will be 0.
12461 The pool of section numbers begins immediately following the hash table
12462 (at offset 16 + 12 * M from the beginning of the section). The pool of
12463 section numbers consists of an array of 32-bit words (using the byte order
12464 of the application binary). Each item in the array is indexed starting
12465 from 0. The hash table entry provides the index of the first section
12466 number in the set. Additional section numbers in the set follow, and the
12467 set is terminated by a 0 entry (section number 0 is not used in ELF).
12469 In each set of section numbers, the .debug_info.dwo or .debug_types.dwo
12470 section must be the first entry in the set, and the .debug_abbrev.dwo must
12471 be the second entry. Other members of the set may follow in any order.
12477 DWP Version 2 combines all the .debug_info, etc. sections into one,
12478 and the entries in the index tables are now offsets into these sections.
12479 CU offsets begin at 0. TU offsets begin at the size of the .debug_info
12482 Index Section Contents:
12484 Hash Table of Signatures dwp_hash_table.hash_table
12485 Parallel Table of Indices dwp_hash_table.unit_table
12486 Table of Section Offsets dwp_hash_table.v2.{section_ids,offsets}
12487 Table of Section Sizes dwp_hash_table.v2.sizes
12489 The index section header consists of:
12491 V, 32 bit version number
12492 L, 32 bit number of columns in the table of section offsets
12493 N, 32 bit number of compilation units or type units in the index
12494 M, 32 bit number of slots in the hash table
12496 Numbers are recorded using the byte order of the application binary.
12498 The hash table has the same format as version 1.
12499 The parallel table of indices has the same format as version 1,
12500 except that the entries are origin-1 indices into the table of sections
12501 offsets and the table of section sizes.
12503 The table of offsets begins immediately following the parallel table
12504 (at offset 16 + 12 * M from the beginning of the section). The table is
12505 a two-dimensional array of 32-bit words (using the byte order of the
12506 application binary), with L columns and N+1 rows, in row-major order.
12507 Each row in the array is indexed starting from 0. The first row provides
12508 a key to the remaining rows: each column in this row provides an identifier
12509 for a debug section, and the offsets in the same column of subsequent rows
12510 refer to that section. The section identifiers are:
12512 DW_SECT_INFO 1 .debug_info.dwo
12513 DW_SECT_TYPES 2 .debug_types.dwo
12514 DW_SECT_ABBREV 3 .debug_abbrev.dwo
12515 DW_SECT_LINE 4 .debug_line.dwo
12516 DW_SECT_LOC 5 .debug_loc.dwo
12517 DW_SECT_STR_OFFSETS 6 .debug_str_offsets.dwo
12518 DW_SECT_MACINFO 7 .debug_macinfo.dwo
12519 DW_SECT_MACRO 8 .debug_macro.dwo
12521 The offsets provided by the CU and TU index sections are the base offsets
12522 for the contributions made by each CU or TU to the corresponding section
12523 in the package file. Each CU and TU header contains an abbrev_offset
12524 field, used to find the abbreviations table for that CU or TU within the
12525 contribution to the .debug_abbrev.dwo section for that CU or TU, and should
12526 be interpreted as relative to the base offset given in the index section.
12527 Likewise, offsets into .debug_line.dwo from DW_AT_stmt_list attributes
12528 should be interpreted as relative to the base offset for .debug_line.dwo,
12529 and offsets into other debug sections obtained from DWARF attributes should
12530 also be interpreted as relative to the corresponding base offset.
12532 The table of sizes begins immediately following the table of offsets.
12533 Like the table of offsets, it is a two-dimensional array of 32-bit words,
12534 with L columns and N rows, in row-major order. Each row in the array is
12535 indexed starting from 1 (row 0 is shared by the two tables).
12539 Hash table lookup is handled the same in version 1 and 2:
12541 We assume that N and M will not exceed 2^32 - 1.
12542 The size of the hash table, M, must be 2^k such that 2^k > 3*N/2.
12544 Given a 64-bit compilation unit signature or a type signature S, an entry
12545 in the hash table is located as follows:
12547 1) Calculate a primary hash H = S & MASK(k), where MASK(k) is a mask with
12548 the low-order k bits all set to 1.
12550 2) Calculate a secondary hash H' = (((S >> 32) & MASK(k)) | 1).
12552 3) If the hash table entry at index H matches the signature, use that
12553 entry. If the hash table entry at index H is unused (all zeroes),
12554 terminate the search: the signature is not present in the table.
12556 4) Let H = (H + H') modulo M. Repeat at Step 3.
12558 Because M > N and H' and M are relatively prime, the search is guaranteed
12559 to stop at an unused slot or find the match. */
12561 /* Create a hash table to map DWO IDs to their CU/TU entry in
12562 .debug_{info,types}.dwo in DWP_FILE.
12563 Returns NULL if there isn't one.
12564 Note: This function processes DWP files only, not DWO files. */
12566 static struct dwp_hash_table *
12567 create_dwp_hash_table (struct dwarf2_per_objfile *dwarf2_per_objfile,
12568 struct dwp_file *dwp_file, int is_debug_types)
12570 struct objfile *objfile = dwarf2_per_objfile->objfile;
12571 bfd *dbfd = dwp_file->dbfd;
12572 const gdb_byte *index_ptr, *index_end;
12573 struct dwarf2_section_info *index;
12574 uint32_t version, nr_columns, nr_units, nr_slots;
12575 struct dwp_hash_table *htab;
12577 if (is_debug_types)
12578 index = &dwp_file->sections.tu_index;
12580 index = &dwp_file->sections.cu_index;
12582 if (dwarf2_section_empty_p (index))
12584 dwarf2_read_section (objfile, index);
12586 index_ptr = index->buffer;
12587 index_end = index_ptr + index->size;
12589 version = read_4_bytes (dbfd, index_ptr);
12592 nr_columns = read_4_bytes (dbfd, index_ptr);
12596 nr_units = read_4_bytes (dbfd, index_ptr);
12598 nr_slots = read_4_bytes (dbfd, index_ptr);
12601 if (version != 1 && version != 2)
12603 error (_("Dwarf Error: unsupported DWP file version (%s)"
12604 " [in module %s]"),
12605 pulongest (version), dwp_file->name);
12607 if (nr_slots != (nr_slots & -nr_slots))
12609 error (_("Dwarf Error: number of slots in DWP hash table (%s)"
12610 " is not power of 2 [in module %s]"),
12611 pulongest (nr_slots), dwp_file->name);
12614 htab = OBSTACK_ZALLOC (&objfile->objfile_obstack, struct dwp_hash_table);
12615 htab->version = version;
12616 htab->nr_columns = nr_columns;
12617 htab->nr_units = nr_units;
12618 htab->nr_slots = nr_slots;
12619 htab->hash_table = index_ptr;
12620 htab->unit_table = htab->hash_table + sizeof (uint64_t) * nr_slots;
12622 /* Exit early if the table is empty. */
12623 if (nr_slots == 0 || nr_units == 0
12624 || (version == 2 && nr_columns == 0))
12626 /* All must be zero. */
12627 if (nr_slots != 0 || nr_units != 0
12628 || (version == 2 && nr_columns != 0))
12630 complaint (&symfile_complaints,
12631 _("Empty DWP but nr_slots,nr_units,nr_columns not"
12632 " all zero [in modules %s]"),
12640 htab->section_pool.v1.indices =
12641 htab->unit_table + sizeof (uint32_t) * nr_slots;
12642 /* It's harder to decide whether the section is too small in v1.
12643 V1 is deprecated anyway so we punt. */
12647 const gdb_byte *ids_ptr = htab->unit_table + sizeof (uint32_t) * nr_slots;
12648 int *ids = htab->section_pool.v2.section_ids;
12649 /* Reverse map for error checking. */
12650 int ids_seen[DW_SECT_MAX + 1];
12653 if (nr_columns < 2)
12655 error (_("Dwarf Error: bad DWP hash table, too few columns"
12656 " in section table [in module %s]"),
12659 if (nr_columns > MAX_NR_V2_DWO_SECTIONS)
12661 error (_("Dwarf Error: bad DWP hash table, too many columns"
12662 " in section table [in module %s]"),
12665 memset (ids, 255, (DW_SECT_MAX + 1) * sizeof (int32_t));
12666 memset (ids_seen, 255, (DW_SECT_MAX + 1) * sizeof (int32_t));
12667 for (i = 0; i < nr_columns; ++i)
12669 int id = read_4_bytes (dbfd, ids_ptr + i * sizeof (uint32_t));
12671 if (id < DW_SECT_MIN || id > DW_SECT_MAX)
12673 error (_("Dwarf Error: bad DWP hash table, bad section id %d"
12674 " in section table [in module %s]"),
12675 id, dwp_file->name);
12677 if (ids_seen[id] != -1)
12679 error (_("Dwarf Error: bad DWP hash table, duplicate section"
12680 " id %d in section table [in module %s]"),
12681 id, dwp_file->name);
12686 /* Must have exactly one info or types section. */
12687 if (((ids_seen[DW_SECT_INFO] != -1)
12688 + (ids_seen[DW_SECT_TYPES] != -1))
12691 error (_("Dwarf Error: bad DWP hash table, missing/duplicate"
12692 " DWO info/types section [in module %s]"),
12695 /* Must have an abbrev section. */
12696 if (ids_seen[DW_SECT_ABBREV] == -1)
12698 error (_("Dwarf Error: bad DWP hash table, missing DWO abbrev"
12699 " section [in module %s]"),
12702 htab->section_pool.v2.offsets = ids_ptr + sizeof (uint32_t) * nr_columns;
12703 htab->section_pool.v2.sizes =
12704 htab->section_pool.v2.offsets + (sizeof (uint32_t)
12705 * nr_units * nr_columns);
12706 if ((htab->section_pool.v2.sizes + (sizeof (uint32_t)
12707 * nr_units * nr_columns))
12710 error (_("Dwarf Error: DWP index section is corrupt (too small)"
12711 " [in module %s]"),
12719 /* Update SECTIONS with the data from SECTP.
12721 This function is like the other "locate" section routines that are
12722 passed to bfd_map_over_sections, but in this context the sections to
12723 read comes from the DWP V1 hash table, not the full ELF section table.
12725 The result is non-zero for success, or zero if an error was found. */
12728 locate_v1_virtual_dwo_sections (asection *sectp,
12729 struct virtual_v1_dwo_sections *sections)
12731 const struct dwop_section_names *names = &dwop_section_names;
12733 if (section_is_p (sectp->name, &names->abbrev_dwo))
12735 /* There can be only one. */
12736 if (sections->abbrev.s.section != NULL)
12738 sections->abbrev.s.section = sectp;
12739 sections->abbrev.size = bfd_get_section_size (sectp);
12741 else if (section_is_p (sectp->name, &names->info_dwo)
12742 || section_is_p (sectp->name, &names->types_dwo))
12744 /* There can be only one. */
12745 if (sections->info_or_types.s.section != NULL)
12747 sections->info_or_types.s.section = sectp;
12748 sections->info_or_types.size = bfd_get_section_size (sectp);
12750 else if (section_is_p (sectp->name, &names->line_dwo))
12752 /* There can be only one. */
12753 if (sections->line.s.section != NULL)
12755 sections->line.s.section = sectp;
12756 sections->line.size = bfd_get_section_size (sectp);
12758 else if (section_is_p (sectp->name, &names->loc_dwo))
12760 /* There can be only one. */
12761 if (sections->loc.s.section != NULL)
12763 sections->loc.s.section = sectp;
12764 sections->loc.size = bfd_get_section_size (sectp);
12766 else if (section_is_p (sectp->name, &names->macinfo_dwo))
12768 /* There can be only one. */
12769 if (sections->macinfo.s.section != NULL)
12771 sections->macinfo.s.section = sectp;
12772 sections->macinfo.size = bfd_get_section_size (sectp);
12774 else if (section_is_p (sectp->name, &names->macro_dwo))
12776 /* There can be only one. */
12777 if (sections->macro.s.section != NULL)
12779 sections->macro.s.section = sectp;
12780 sections->macro.size = bfd_get_section_size (sectp);
12782 else if (section_is_p (sectp->name, &names->str_offsets_dwo))
12784 /* There can be only one. */
12785 if (sections->str_offsets.s.section != NULL)
12787 sections->str_offsets.s.section = sectp;
12788 sections->str_offsets.size = bfd_get_section_size (sectp);
12792 /* No other kind of section is valid. */
12799 /* Create a dwo_unit object for the DWO unit with signature SIGNATURE.
12800 UNIT_INDEX is the index of the DWO unit in the DWP hash table.
12801 COMP_DIR is the DW_AT_comp_dir attribute of the referencing CU.
12802 This is for DWP version 1 files. */
12804 static struct dwo_unit *
12805 create_dwo_unit_in_dwp_v1 (struct dwarf2_per_objfile *dwarf2_per_objfile,
12806 struct dwp_file *dwp_file,
12807 uint32_t unit_index,
12808 const char *comp_dir,
12809 ULONGEST signature, int is_debug_types)
12811 struct objfile *objfile = dwarf2_per_objfile->objfile;
12812 const struct dwp_hash_table *dwp_htab =
12813 is_debug_types ? dwp_file->tus : dwp_file->cus;
12814 bfd *dbfd = dwp_file->dbfd;
12815 const char *kind = is_debug_types ? "TU" : "CU";
12816 struct dwo_file *dwo_file;
12817 struct dwo_unit *dwo_unit;
12818 struct virtual_v1_dwo_sections sections;
12819 void **dwo_file_slot;
12822 gdb_assert (dwp_file->version == 1);
12824 if (dwarf_read_debug)
12826 fprintf_unfiltered (gdb_stdlog, "Reading %s %s/%s in DWP V1 file: %s\n",
12828 pulongest (unit_index), hex_string (signature),
12832 /* Fetch the sections of this DWO unit.
12833 Put a limit on the number of sections we look for so that bad data
12834 doesn't cause us to loop forever. */
12836 #define MAX_NR_V1_DWO_SECTIONS \
12837 (1 /* .debug_info or .debug_types */ \
12838 + 1 /* .debug_abbrev */ \
12839 + 1 /* .debug_line */ \
12840 + 1 /* .debug_loc */ \
12841 + 1 /* .debug_str_offsets */ \
12842 + 1 /* .debug_macro or .debug_macinfo */ \
12843 + 1 /* trailing zero */)
12845 memset (§ions, 0, sizeof (sections));
12847 for (i = 0; i < MAX_NR_V1_DWO_SECTIONS; ++i)
12850 uint32_t section_nr =
12851 read_4_bytes (dbfd,
12852 dwp_htab->section_pool.v1.indices
12853 + (unit_index + i) * sizeof (uint32_t));
12855 if (section_nr == 0)
12857 if (section_nr >= dwp_file->num_sections)
12859 error (_("Dwarf Error: bad DWP hash table, section number too large"
12860 " [in module %s]"),
12864 sectp = dwp_file->elf_sections[section_nr];
12865 if (! locate_v1_virtual_dwo_sections (sectp, §ions))
12867 error (_("Dwarf Error: bad DWP hash table, invalid section found"
12868 " [in module %s]"),
12874 || dwarf2_section_empty_p (§ions.info_or_types)
12875 || dwarf2_section_empty_p (§ions.abbrev))
12877 error (_("Dwarf Error: bad DWP hash table, missing DWO sections"
12878 " [in module %s]"),
12881 if (i == MAX_NR_V1_DWO_SECTIONS)
12883 error (_("Dwarf Error: bad DWP hash table, too many DWO sections"
12884 " [in module %s]"),
12888 /* It's easier for the rest of the code if we fake a struct dwo_file and
12889 have dwo_unit "live" in that. At least for now.
12891 The DWP file can be made up of a random collection of CUs and TUs.
12892 However, for each CU + set of TUs that came from the same original DWO
12893 file, we can combine them back into a virtual DWO file to save space
12894 (fewer struct dwo_file objects to allocate). Remember that for really
12895 large apps there can be on the order of 8K CUs and 200K TUs, or more. */
12897 std::string virtual_dwo_name =
12898 string_printf ("virtual-dwo/%d-%d-%d-%d",
12899 get_section_id (§ions.abbrev),
12900 get_section_id (§ions.line),
12901 get_section_id (§ions.loc),
12902 get_section_id (§ions.str_offsets));
12903 /* Can we use an existing virtual DWO file? */
12904 dwo_file_slot = lookup_dwo_file_slot (dwarf2_per_objfile,
12905 virtual_dwo_name.c_str (),
12907 /* Create one if necessary. */
12908 if (*dwo_file_slot == NULL)
12910 if (dwarf_read_debug)
12912 fprintf_unfiltered (gdb_stdlog, "Creating virtual DWO: %s\n",
12913 virtual_dwo_name.c_str ());
12915 dwo_file = OBSTACK_ZALLOC (&objfile->objfile_obstack, struct dwo_file);
12917 = (const char *) obstack_copy0 (&objfile->objfile_obstack,
12918 virtual_dwo_name.c_str (),
12919 virtual_dwo_name.size ());
12920 dwo_file->comp_dir = comp_dir;
12921 dwo_file->sections.abbrev = sections.abbrev;
12922 dwo_file->sections.line = sections.line;
12923 dwo_file->sections.loc = sections.loc;
12924 dwo_file->sections.macinfo = sections.macinfo;
12925 dwo_file->sections.macro = sections.macro;
12926 dwo_file->sections.str_offsets = sections.str_offsets;
12927 /* The "str" section is global to the entire DWP file. */
12928 dwo_file->sections.str = dwp_file->sections.str;
12929 /* The info or types section is assigned below to dwo_unit,
12930 there's no need to record it in dwo_file.
12931 Also, we can't simply record type sections in dwo_file because
12932 we record a pointer into the vector in dwo_unit. As we collect more
12933 types we'll grow the vector and eventually have to reallocate space
12934 for it, invalidating all copies of pointers into the previous
12936 *dwo_file_slot = dwo_file;
12940 if (dwarf_read_debug)
12942 fprintf_unfiltered (gdb_stdlog, "Using existing virtual DWO: %s\n",
12943 virtual_dwo_name.c_str ());
12945 dwo_file = (struct dwo_file *) *dwo_file_slot;
12948 dwo_unit = OBSTACK_ZALLOC (&objfile->objfile_obstack, struct dwo_unit);
12949 dwo_unit->dwo_file = dwo_file;
12950 dwo_unit->signature = signature;
12951 dwo_unit->section =
12952 XOBNEW (&objfile->objfile_obstack, struct dwarf2_section_info);
12953 *dwo_unit->section = sections.info_or_types;
12954 /* dwo_unit->{offset,length,type_offset_in_tu} are set later. */
12959 /* Subroutine of create_dwo_unit_in_dwp_v2 to simplify it.
12960 Given a pointer to the containing section SECTION, and OFFSET,SIZE of the
12961 piece within that section used by a TU/CU, return a virtual section
12962 of just that piece. */
12964 static struct dwarf2_section_info
12965 create_dwp_v2_section (struct dwarf2_per_objfile *dwarf2_per_objfile,
12966 struct dwarf2_section_info *section,
12967 bfd_size_type offset, bfd_size_type size)
12969 struct dwarf2_section_info result;
12972 gdb_assert (section != NULL);
12973 gdb_assert (!section->is_virtual);
12975 memset (&result, 0, sizeof (result));
12976 result.s.containing_section = section;
12977 result.is_virtual = 1;
12982 sectp = get_section_bfd_section (section);
12984 /* Flag an error if the piece denoted by OFFSET,SIZE is outside the
12985 bounds of the real section. This is a pretty-rare event, so just
12986 flag an error (easier) instead of a warning and trying to cope. */
12988 || offset + size > bfd_get_section_size (sectp))
12990 error (_("Dwarf Error: Bad DWP V2 section info, doesn't fit"
12991 " in section %s [in module %s]"),
12992 sectp ? bfd_section_name (abfd, sectp) : "<unknown>",
12993 objfile_name (dwarf2_per_objfile->objfile));
12996 result.virtual_offset = offset;
12997 result.size = size;
13001 /* Create a dwo_unit object for the DWO unit with signature SIGNATURE.
13002 UNIT_INDEX is the index of the DWO unit in the DWP hash table.
13003 COMP_DIR is the DW_AT_comp_dir attribute of the referencing CU.
13004 This is for DWP version 2 files. */
13006 static struct dwo_unit *
13007 create_dwo_unit_in_dwp_v2 (struct dwarf2_per_objfile *dwarf2_per_objfile,
13008 struct dwp_file *dwp_file,
13009 uint32_t unit_index,
13010 const char *comp_dir,
13011 ULONGEST signature, int is_debug_types)
13013 struct objfile *objfile = dwarf2_per_objfile->objfile;
13014 const struct dwp_hash_table *dwp_htab =
13015 is_debug_types ? dwp_file->tus : dwp_file->cus;
13016 bfd *dbfd = dwp_file->dbfd;
13017 const char *kind = is_debug_types ? "TU" : "CU";
13018 struct dwo_file *dwo_file;
13019 struct dwo_unit *dwo_unit;
13020 struct virtual_v2_dwo_sections sections;
13021 void **dwo_file_slot;
13024 gdb_assert (dwp_file->version == 2);
13026 if (dwarf_read_debug)
13028 fprintf_unfiltered (gdb_stdlog, "Reading %s %s/%s in DWP V2 file: %s\n",
13030 pulongest (unit_index), hex_string (signature),
13034 /* Fetch the section offsets of this DWO unit. */
13036 memset (§ions, 0, sizeof (sections));
13038 for (i = 0; i < dwp_htab->nr_columns; ++i)
13040 uint32_t offset = read_4_bytes (dbfd,
13041 dwp_htab->section_pool.v2.offsets
13042 + (((unit_index - 1) * dwp_htab->nr_columns
13044 * sizeof (uint32_t)));
13045 uint32_t size = read_4_bytes (dbfd,
13046 dwp_htab->section_pool.v2.sizes
13047 + (((unit_index - 1) * dwp_htab->nr_columns
13049 * sizeof (uint32_t)));
13051 switch (dwp_htab->section_pool.v2.section_ids[i])
13054 case DW_SECT_TYPES:
13055 sections.info_or_types_offset = offset;
13056 sections.info_or_types_size = size;
13058 case DW_SECT_ABBREV:
13059 sections.abbrev_offset = offset;
13060 sections.abbrev_size = size;
13063 sections.line_offset = offset;
13064 sections.line_size = size;
13067 sections.loc_offset = offset;
13068 sections.loc_size = size;
13070 case DW_SECT_STR_OFFSETS:
13071 sections.str_offsets_offset = offset;
13072 sections.str_offsets_size = size;
13074 case DW_SECT_MACINFO:
13075 sections.macinfo_offset = offset;
13076 sections.macinfo_size = size;
13078 case DW_SECT_MACRO:
13079 sections.macro_offset = offset;
13080 sections.macro_size = size;
13085 /* It's easier for the rest of the code if we fake a struct dwo_file and
13086 have dwo_unit "live" in that. At least for now.
13088 The DWP file can be made up of a random collection of CUs and TUs.
13089 However, for each CU + set of TUs that came from the same original DWO
13090 file, we can combine them back into a virtual DWO file to save space
13091 (fewer struct dwo_file objects to allocate). Remember that for really
13092 large apps there can be on the order of 8K CUs and 200K TUs, or more. */
13094 std::string virtual_dwo_name =
13095 string_printf ("virtual-dwo/%ld-%ld-%ld-%ld",
13096 (long) (sections.abbrev_size ? sections.abbrev_offset : 0),
13097 (long) (sections.line_size ? sections.line_offset : 0),
13098 (long) (sections.loc_size ? sections.loc_offset : 0),
13099 (long) (sections.str_offsets_size
13100 ? sections.str_offsets_offset : 0));
13101 /* Can we use an existing virtual DWO file? */
13102 dwo_file_slot = lookup_dwo_file_slot (dwarf2_per_objfile,
13103 virtual_dwo_name.c_str (),
13105 /* Create one if necessary. */
13106 if (*dwo_file_slot == NULL)
13108 if (dwarf_read_debug)
13110 fprintf_unfiltered (gdb_stdlog, "Creating virtual DWO: %s\n",
13111 virtual_dwo_name.c_str ());
13113 dwo_file = OBSTACK_ZALLOC (&objfile->objfile_obstack, struct dwo_file);
13115 = (const char *) obstack_copy0 (&objfile->objfile_obstack,
13116 virtual_dwo_name.c_str (),
13117 virtual_dwo_name.size ());
13118 dwo_file->comp_dir = comp_dir;
13119 dwo_file->sections.abbrev =
13120 create_dwp_v2_section (dwarf2_per_objfile, &dwp_file->sections.abbrev,
13121 sections.abbrev_offset, sections.abbrev_size);
13122 dwo_file->sections.line =
13123 create_dwp_v2_section (dwarf2_per_objfile, &dwp_file->sections.line,
13124 sections.line_offset, sections.line_size);
13125 dwo_file->sections.loc =
13126 create_dwp_v2_section (dwarf2_per_objfile, &dwp_file->sections.loc,
13127 sections.loc_offset, sections.loc_size);
13128 dwo_file->sections.macinfo =
13129 create_dwp_v2_section (dwarf2_per_objfile, &dwp_file->sections.macinfo,
13130 sections.macinfo_offset, sections.macinfo_size);
13131 dwo_file->sections.macro =
13132 create_dwp_v2_section (dwarf2_per_objfile, &dwp_file->sections.macro,
13133 sections.macro_offset, sections.macro_size);
13134 dwo_file->sections.str_offsets =
13135 create_dwp_v2_section (dwarf2_per_objfile,
13136 &dwp_file->sections.str_offsets,
13137 sections.str_offsets_offset,
13138 sections.str_offsets_size);
13139 /* The "str" section is global to the entire DWP file. */
13140 dwo_file->sections.str = dwp_file->sections.str;
13141 /* The info or types section is assigned below to dwo_unit,
13142 there's no need to record it in dwo_file.
13143 Also, we can't simply record type sections in dwo_file because
13144 we record a pointer into the vector in dwo_unit. As we collect more
13145 types we'll grow the vector and eventually have to reallocate space
13146 for it, invalidating all copies of pointers into the previous
13148 *dwo_file_slot = dwo_file;
13152 if (dwarf_read_debug)
13154 fprintf_unfiltered (gdb_stdlog, "Using existing virtual DWO: %s\n",
13155 virtual_dwo_name.c_str ());
13157 dwo_file = (struct dwo_file *) *dwo_file_slot;
13160 dwo_unit = OBSTACK_ZALLOC (&objfile->objfile_obstack, struct dwo_unit);
13161 dwo_unit->dwo_file = dwo_file;
13162 dwo_unit->signature = signature;
13163 dwo_unit->section =
13164 XOBNEW (&objfile->objfile_obstack, struct dwarf2_section_info);
13165 *dwo_unit->section = create_dwp_v2_section (dwarf2_per_objfile,
13167 ? &dwp_file->sections.types
13168 : &dwp_file->sections.info,
13169 sections.info_or_types_offset,
13170 sections.info_or_types_size);
13171 /* dwo_unit->{offset,length,type_offset_in_tu} are set later. */
13176 /* Lookup the DWO unit with SIGNATURE in DWP_FILE.
13177 Returns NULL if the signature isn't found. */
13179 static struct dwo_unit *
13180 lookup_dwo_unit_in_dwp (struct dwarf2_per_objfile *dwarf2_per_objfile,
13181 struct dwp_file *dwp_file, const char *comp_dir,
13182 ULONGEST signature, int is_debug_types)
13184 const struct dwp_hash_table *dwp_htab =
13185 is_debug_types ? dwp_file->tus : dwp_file->cus;
13186 bfd *dbfd = dwp_file->dbfd;
13187 uint32_t mask = dwp_htab->nr_slots - 1;
13188 uint32_t hash = signature & mask;
13189 uint32_t hash2 = ((signature >> 32) & mask) | 1;
13192 struct dwo_unit find_dwo_cu;
13194 memset (&find_dwo_cu, 0, sizeof (find_dwo_cu));
13195 find_dwo_cu.signature = signature;
13196 slot = htab_find_slot (is_debug_types
13197 ? dwp_file->loaded_tus
13198 : dwp_file->loaded_cus,
13199 &find_dwo_cu, INSERT);
13202 return (struct dwo_unit *) *slot;
13204 /* Use a for loop so that we don't loop forever on bad debug info. */
13205 for (i = 0; i < dwp_htab->nr_slots; ++i)
13207 ULONGEST signature_in_table;
13209 signature_in_table =
13210 read_8_bytes (dbfd, dwp_htab->hash_table + hash * sizeof (uint64_t));
13211 if (signature_in_table == signature)
13213 uint32_t unit_index =
13214 read_4_bytes (dbfd,
13215 dwp_htab->unit_table + hash * sizeof (uint32_t));
13217 if (dwp_file->version == 1)
13219 *slot = create_dwo_unit_in_dwp_v1 (dwarf2_per_objfile,
13220 dwp_file, unit_index,
13221 comp_dir, signature,
13226 *slot = create_dwo_unit_in_dwp_v2 (dwarf2_per_objfile,
13227 dwp_file, unit_index,
13228 comp_dir, signature,
13231 return (struct dwo_unit *) *slot;
13233 if (signature_in_table == 0)
13235 hash = (hash + hash2) & mask;
13238 error (_("Dwarf Error: bad DWP hash table, lookup didn't terminate"
13239 " [in module %s]"),
13243 /* Subroutine of open_dwo_file,open_dwp_file to simplify them.
13244 Open the file specified by FILE_NAME and hand it off to BFD for
13245 preliminary analysis. Return a newly initialized bfd *, which
13246 includes a canonicalized copy of FILE_NAME.
13247 If IS_DWP is TRUE, we're opening a DWP file, otherwise a DWO file.
13248 SEARCH_CWD is true if the current directory is to be searched.
13249 It will be searched before debug-file-directory.
13250 If successful, the file is added to the bfd include table of the
13251 objfile's bfd (see gdb_bfd_record_inclusion).
13252 If unable to find/open the file, return NULL.
13253 NOTE: This function is derived from symfile_bfd_open. */
13255 static gdb_bfd_ref_ptr
13256 try_open_dwop_file (struct dwarf2_per_objfile *dwarf2_per_objfile,
13257 const char *file_name, int is_dwp, int search_cwd)
13260 /* Blech. OPF_TRY_CWD_FIRST also disables searching the path list if
13261 FILE_NAME contains a '/'. So we can't use it. Instead prepend "."
13262 to debug_file_directory. */
13263 const char *search_path;
13264 static const char dirname_separator_string[] = { DIRNAME_SEPARATOR, '\0' };
13266 gdb::unique_xmalloc_ptr<char> search_path_holder;
13269 if (*debug_file_directory != '\0')
13271 search_path_holder.reset (concat (".", dirname_separator_string,
13272 debug_file_directory,
13274 search_path = search_path_holder.get ();
13280 search_path = debug_file_directory;
13282 openp_flags flags = OPF_RETURN_REALPATH;
13284 flags |= OPF_SEARCH_IN_PATH;
13286 gdb::unique_xmalloc_ptr<char> absolute_name;
13287 desc = openp (search_path, flags, file_name,
13288 O_RDONLY | O_BINARY, &absolute_name);
13292 gdb_bfd_ref_ptr sym_bfd (gdb_bfd_open (absolute_name.get (),
13294 if (sym_bfd == NULL)
13296 bfd_set_cacheable (sym_bfd.get (), 1);
13298 if (!bfd_check_format (sym_bfd.get (), bfd_object))
13301 /* Success. Record the bfd as having been included by the objfile's bfd.
13302 This is important because things like demangled_names_hash lives in the
13303 objfile's per_bfd space and may have references to things like symbol
13304 names that live in the DWO/DWP file's per_bfd space. PR 16426. */
13305 gdb_bfd_record_inclusion (dwarf2_per_objfile->objfile->obfd, sym_bfd.get ());
13310 /* Try to open DWO file FILE_NAME.
13311 COMP_DIR is the DW_AT_comp_dir attribute.
13312 The result is the bfd handle of the file.
13313 If there is a problem finding or opening the file, return NULL.
13314 Upon success, the canonicalized path of the file is stored in the bfd,
13315 same as symfile_bfd_open. */
13317 static gdb_bfd_ref_ptr
13318 open_dwo_file (struct dwarf2_per_objfile *dwarf2_per_objfile,
13319 const char *file_name, const char *comp_dir)
13321 if (IS_ABSOLUTE_PATH (file_name))
13322 return try_open_dwop_file (dwarf2_per_objfile, file_name,
13323 0 /*is_dwp*/, 0 /*search_cwd*/);
13325 /* Before trying the search path, try DWO_NAME in COMP_DIR. */
13327 if (comp_dir != NULL)
13329 char *path_to_try = concat (comp_dir, SLASH_STRING,
13330 file_name, (char *) NULL);
13332 /* NOTE: If comp_dir is a relative path, this will also try the
13333 search path, which seems useful. */
13334 gdb_bfd_ref_ptr abfd (try_open_dwop_file (dwarf2_per_objfile,
13337 1 /*search_cwd*/));
13338 xfree (path_to_try);
13343 /* That didn't work, try debug-file-directory, which, despite its name,
13344 is a list of paths. */
13346 if (*debug_file_directory == '\0')
13349 return try_open_dwop_file (dwarf2_per_objfile, file_name,
13350 0 /*is_dwp*/, 1 /*search_cwd*/);
13353 /* This function is mapped across the sections and remembers the offset and
13354 size of each of the DWO debugging sections we are interested in. */
13357 dwarf2_locate_dwo_sections (bfd *abfd, asection *sectp, void *dwo_sections_ptr)
13359 struct dwo_sections *dwo_sections = (struct dwo_sections *) dwo_sections_ptr;
13360 const struct dwop_section_names *names = &dwop_section_names;
13362 if (section_is_p (sectp->name, &names->abbrev_dwo))
13364 dwo_sections->abbrev.s.section = sectp;
13365 dwo_sections->abbrev.size = bfd_get_section_size (sectp);
13367 else if (section_is_p (sectp->name, &names->info_dwo))
13369 dwo_sections->info.s.section = sectp;
13370 dwo_sections->info.size = bfd_get_section_size (sectp);
13372 else if (section_is_p (sectp->name, &names->line_dwo))
13374 dwo_sections->line.s.section = sectp;
13375 dwo_sections->line.size = bfd_get_section_size (sectp);
13377 else if (section_is_p (sectp->name, &names->loc_dwo))
13379 dwo_sections->loc.s.section = sectp;
13380 dwo_sections->loc.size = bfd_get_section_size (sectp);
13382 else if (section_is_p (sectp->name, &names->macinfo_dwo))
13384 dwo_sections->macinfo.s.section = sectp;
13385 dwo_sections->macinfo.size = bfd_get_section_size (sectp);
13387 else if (section_is_p (sectp->name, &names->macro_dwo))
13389 dwo_sections->macro.s.section = sectp;
13390 dwo_sections->macro.size = bfd_get_section_size (sectp);
13392 else if (section_is_p (sectp->name, &names->str_dwo))
13394 dwo_sections->str.s.section = sectp;
13395 dwo_sections->str.size = bfd_get_section_size (sectp);
13397 else if (section_is_p (sectp->name, &names->str_offsets_dwo))
13399 dwo_sections->str_offsets.s.section = sectp;
13400 dwo_sections->str_offsets.size = bfd_get_section_size (sectp);
13402 else if (section_is_p (sectp->name, &names->types_dwo))
13404 struct dwarf2_section_info type_section;
13406 memset (&type_section, 0, sizeof (type_section));
13407 type_section.s.section = sectp;
13408 type_section.size = bfd_get_section_size (sectp);
13409 VEC_safe_push (dwarf2_section_info_def, dwo_sections->types,
13414 /* Initialize the use of the DWO file specified by DWO_NAME and referenced
13415 by PER_CU. This is for the non-DWP case.
13416 The result is NULL if DWO_NAME can't be found. */
13418 static struct dwo_file *
13419 open_and_init_dwo_file (struct dwarf2_per_cu_data *per_cu,
13420 const char *dwo_name, const char *comp_dir)
13422 struct dwarf2_per_objfile *dwarf2_per_objfile = per_cu->dwarf2_per_objfile;
13423 struct objfile *objfile = dwarf2_per_objfile->objfile;
13424 struct dwo_file *dwo_file;
13425 struct cleanup *cleanups;
13427 gdb_bfd_ref_ptr dbfd (open_dwo_file (dwarf2_per_objfile, dwo_name, comp_dir));
13430 if (dwarf_read_debug)
13431 fprintf_unfiltered (gdb_stdlog, "DWO file not found: %s\n", dwo_name);
13434 dwo_file = OBSTACK_ZALLOC (&objfile->objfile_obstack, struct dwo_file);
13435 dwo_file->dwo_name = dwo_name;
13436 dwo_file->comp_dir = comp_dir;
13437 dwo_file->dbfd = dbfd.release ();
13439 free_dwo_file_cleanup_data *cleanup_data = XNEW (free_dwo_file_cleanup_data);
13440 cleanup_data->dwo_file = dwo_file;
13441 cleanup_data->dwarf2_per_objfile = dwarf2_per_objfile;
13443 cleanups = make_cleanup (free_dwo_file_cleanup, cleanup_data);
13445 bfd_map_over_sections (dwo_file->dbfd, dwarf2_locate_dwo_sections,
13446 &dwo_file->sections);
13448 create_cus_hash_table (dwarf2_per_objfile, *dwo_file, dwo_file->sections.info,
13451 create_debug_types_hash_table (dwarf2_per_objfile, dwo_file,
13452 dwo_file->sections.types, dwo_file->tus);
13454 discard_cleanups (cleanups);
13456 if (dwarf_read_debug)
13457 fprintf_unfiltered (gdb_stdlog, "DWO file found: %s\n", dwo_name);
13462 /* This function is mapped across the sections and remembers the offset and
13463 size of each of the DWP debugging sections common to version 1 and 2 that
13464 we are interested in. */
13467 dwarf2_locate_common_dwp_sections (bfd *abfd, asection *sectp,
13468 void *dwp_file_ptr)
13470 struct dwp_file *dwp_file = (struct dwp_file *) dwp_file_ptr;
13471 const struct dwop_section_names *names = &dwop_section_names;
13472 unsigned int elf_section_nr = elf_section_data (sectp)->this_idx;
13474 /* Record the ELF section number for later lookup: this is what the
13475 .debug_cu_index,.debug_tu_index tables use in DWP V1. */
13476 gdb_assert (elf_section_nr < dwp_file->num_sections);
13477 dwp_file->elf_sections[elf_section_nr] = sectp;
13479 /* Look for specific sections that we need. */
13480 if (section_is_p (sectp->name, &names->str_dwo))
13482 dwp_file->sections.str.s.section = sectp;
13483 dwp_file->sections.str.size = bfd_get_section_size (sectp);
13485 else if (section_is_p (sectp->name, &names->cu_index))
13487 dwp_file->sections.cu_index.s.section = sectp;
13488 dwp_file->sections.cu_index.size = bfd_get_section_size (sectp);
13490 else if (section_is_p (sectp->name, &names->tu_index))
13492 dwp_file->sections.tu_index.s.section = sectp;
13493 dwp_file->sections.tu_index.size = bfd_get_section_size (sectp);
13497 /* This function is mapped across the sections and remembers the offset and
13498 size of each of the DWP version 2 debugging sections that we are interested
13499 in. This is split into a separate function because we don't know if we
13500 have version 1 or 2 until we parse the cu_index/tu_index sections. */
13503 dwarf2_locate_v2_dwp_sections (bfd *abfd, asection *sectp, void *dwp_file_ptr)
13505 struct dwp_file *dwp_file = (struct dwp_file *) dwp_file_ptr;
13506 const struct dwop_section_names *names = &dwop_section_names;
13507 unsigned int elf_section_nr = elf_section_data (sectp)->this_idx;
13509 /* Record the ELF section number for later lookup: this is what the
13510 .debug_cu_index,.debug_tu_index tables use in DWP V1. */
13511 gdb_assert (elf_section_nr < dwp_file->num_sections);
13512 dwp_file->elf_sections[elf_section_nr] = sectp;
13514 /* Look for specific sections that we need. */
13515 if (section_is_p (sectp->name, &names->abbrev_dwo))
13517 dwp_file->sections.abbrev.s.section = sectp;
13518 dwp_file->sections.abbrev.size = bfd_get_section_size (sectp);
13520 else if (section_is_p (sectp->name, &names->info_dwo))
13522 dwp_file->sections.info.s.section = sectp;
13523 dwp_file->sections.info.size = bfd_get_section_size (sectp);
13525 else if (section_is_p (sectp->name, &names->line_dwo))
13527 dwp_file->sections.line.s.section = sectp;
13528 dwp_file->sections.line.size = bfd_get_section_size (sectp);
13530 else if (section_is_p (sectp->name, &names->loc_dwo))
13532 dwp_file->sections.loc.s.section = sectp;
13533 dwp_file->sections.loc.size = bfd_get_section_size (sectp);
13535 else if (section_is_p (sectp->name, &names->macinfo_dwo))
13537 dwp_file->sections.macinfo.s.section = sectp;
13538 dwp_file->sections.macinfo.size = bfd_get_section_size (sectp);
13540 else if (section_is_p (sectp->name, &names->macro_dwo))
13542 dwp_file->sections.macro.s.section = sectp;
13543 dwp_file->sections.macro.size = bfd_get_section_size (sectp);
13545 else if (section_is_p (sectp->name, &names->str_offsets_dwo))
13547 dwp_file->sections.str_offsets.s.section = sectp;
13548 dwp_file->sections.str_offsets.size = bfd_get_section_size (sectp);
13550 else if (section_is_p (sectp->name, &names->types_dwo))
13552 dwp_file->sections.types.s.section = sectp;
13553 dwp_file->sections.types.size = bfd_get_section_size (sectp);
13557 /* Hash function for dwp_file loaded CUs/TUs. */
13560 hash_dwp_loaded_cutus (const void *item)
13562 const struct dwo_unit *dwo_unit = (const struct dwo_unit *) item;
13564 /* This drops the top 32 bits of the signature, but is ok for a hash. */
13565 return dwo_unit->signature;
13568 /* Equality function for dwp_file loaded CUs/TUs. */
13571 eq_dwp_loaded_cutus (const void *a, const void *b)
13573 const struct dwo_unit *dua = (const struct dwo_unit *) a;
13574 const struct dwo_unit *dub = (const struct dwo_unit *) b;
13576 return dua->signature == dub->signature;
13579 /* Allocate a hash table for dwp_file loaded CUs/TUs. */
13582 allocate_dwp_loaded_cutus_table (struct objfile *objfile)
13584 return htab_create_alloc_ex (3,
13585 hash_dwp_loaded_cutus,
13586 eq_dwp_loaded_cutus,
13588 &objfile->objfile_obstack,
13589 hashtab_obstack_allocate,
13590 dummy_obstack_deallocate);
13593 /* Try to open DWP file FILE_NAME.
13594 The result is the bfd handle of the file.
13595 If there is a problem finding or opening the file, return NULL.
13596 Upon success, the canonicalized path of the file is stored in the bfd,
13597 same as symfile_bfd_open. */
13599 static gdb_bfd_ref_ptr
13600 open_dwp_file (struct dwarf2_per_objfile *dwarf2_per_objfile,
13601 const char *file_name)
13603 gdb_bfd_ref_ptr abfd (try_open_dwop_file (dwarf2_per_objfile, file_name,
13605 1 /*search_cwd*/));
13609 /* Work around upstream bug 15652.
13610 http://sourceware.org/bugzilla/show_bug.cgi?id=15652
13611 [Whether that's a "bug" is debatable, but it is getting in our way.]
13612 We have no real idea where the dwp file is, because gdb's realpath-ing
13613 of the executable's path may have discarded the needed info.
13614 [IWBN if the dwp file name was recorded in the executable, akin to
13615 .gnu_debuglink, but that doesn't exist yet.]
13616 Strip the directory from FILE_NAME and search again. */
13617 if (*debug_file_directory != '\0')
13619 /* Don't implicitly search the current directory here.
13620 If the user wants to search "." to handle this case,
13621 it must be added to debug-file-directory. */
13622 return try_open_dwop_file (dwarf2_per_objfile,
13623 lbasename (file_name), 1 /*is_dwp*/,
13630 /* Initialize the use of the DWP file for the current objfile.
13631 By convention the name of the DWP file is ${objfile}.dwp.
13632 The result is NULL if it can't be found. */
13634 static struct dwp_file *
13635 open_and_init_dwp_file (struct dwarf2_per_objfile *dwarf2_per_objfile)
13637 struct objfile *objfile = dwarf2_per_objfile->objfile;
13638 struct dwp_file *dwp_file;
13640 /* Try to find first .dwp for the binary file before any symbolic links
13643 /* If the objfile is a debug file, find the name of the real binary
13644 file and get the name of dwp file from there. */
13645 std::string dwp_name;
13646 if (objfile->separate_debug_objfile_backlink != NULL)
13648 struct objfile *backlink = objfile->separate_debug_objfile_backlink;
13649 const char *backlink_basename = lbasename (backlink->original_name);
13651 dwp_name = ldirname (objfile->original_name) + SLASH_STRING + backlink_basename;
13654 dwp_name = objfile->original_name;
13656 dwp_name += ".dwp";
13658 gdb_bfd_ref_ptr dbfd (open_dwp_file (dwarf2_per_objfile, dwp_name.c_str ()));
13660 && strcmp (objfile->original_name, objfile_name (objfile)) != 0)
13662 /* Try to find .dwp for the binary file after gdb_realpath resolving. */
13663 dwp_name = objfile_name (objfile);
13664 dwp_name += ".dwp";
13665 dbfd = open_dwp_file (dwarf2_per_objfile, dwp_name.c_str ());
13670 if (dwarf_read_debug)
13671 fprintf_unfiltered (gdb_stdlog, "DWP file not found: %s\n", dwp_name.c_str ());
13674 dwp_file = OBSTACK_ZALLOC (&objfile->objfile_obstack, struct dwp_file);
13675 dwp_file->name = bfd_get_filename (dbfd.get ());
13676 dwp_file->dbfd = dbfd.release ();
13678 /* +1: section 0 is unused */
13679 dwp_file->num_sections = bfd_count_sections (dwp_file->dbfd) + 1;
13680 dwp_file->elf_sections =
13681 OBSTACK_CALLOC (&objfile->objfile_obstack,
13682 dwp_file->num_sections, asection *);
13684 bfd_map_over_sections (dwp_file->dbfd, dwarf2_locate_common_dwp_sections,
13687 dwp_file->cus = create_dwp_hash_table (dwarf2_per_objfile, dwp_file, 0);
13689 dwp_file->tus = create_dwp_hash_table (dwarf2_per_objfile, dwp_file, 1);
13691 /* The DWP file version is stored in the hash table. Oh well. */
13692 if (dwp_file->cus && dwp_file->tus
13693 && dwp_file->cus->version != dwp_file->tus->version)
13695 /* Technically speaking, we should try to limp along, but this is
13696 pretty bizarre. We use pulongest here because that's the established
13697 portability solution (e.g, we cannot use %u for uint32_t). */
13698 error (_("Dwarf Error: DWP file CU version %s doesn't match"
13699 " TU version %s [in DWP file %s]"),
13700 pulongest (dwp_file->cus->version),
13701 pulongest (dwp_file->tus->version), dwp_name.c_str ());
13705 dwp_file->version = dwp_file->cus->version;
13706 else if (dwp_file->tus)
13707 dwp_file->version = dwp_file->tus->version;
13709 dwp_file->version = 2;
13711 if (dwp_file->version == 2)
13712 bfd_map_over_sections (dwp_file->dbfd, dwarf2_locate_v2_dwp_sections,
13715 dwp_file->loaded_cus = allocate_dwp_loaded_cutus_table (objfile);
13716 dwp_file->loaded_tus = allocate_dwp_loaded_cutus_table (objfile);
13718 if (dwarf_read_debug)
13720 fprintf_unfiltered (gdb_stdlog, "DWP file found: %s\n", dwp_file->name);
13721 fprintf_unfiltered (gdb_stdlog,
13722 " %s CUs, %s TUs\n",
13723 pulongest (dwp_file->cus ? dwp_file->cus->nr_units : 0),
13724 pulongest (dwp_file->tus ? dwp_file->tus->nr_units : 0));
13730 /* Wrapper around open_and_init_dwp_file, only open it once. */
13732 static struct dwp_file *
13733 get_dwp_file (struct dwarf2_per_objfile *dwarf2_per_objfile)
13735 if (! dwarf2_per_objfile->dwp_checked)
13737 dwarf2_per_objfile->dwp_file
13738 = open_and_init_dwp_file (dwarf2_per_objfile);
13739 dwarf2_per_objfile->dwp_checked = 1;
13741 return dwarf2_per_objfile->dwp_file;
13744 /* Subroutine of lookup_dwo_comp_unit, lookup_dwo_type_unit.
13745 Look up the CU/TU with signature SIGNATURE, either in DWO file DWO_NAME
13746 or in the DWP file for the objfile, referenced by THIS_UNIT.
13747 If non-NULL, comp_dir is the DW_AT_comp_dir attribute.
13748 IS_DEBUG_TYPES is non-zero if reading a TU, otherwise read a CU.
13750 This is called, for example, when wanting to read a variable with a
13751 complex location. Therefore we don't want to do file i/o for every call.
13752 Therefore we don't want to look for a DWO file on every call.
13753 Therefore we first see if we've already seen SIGNATURE in a DWP file,
13754 then we check if we've already seen DWO_NAME, and only THEN do we check
13757 The result is a pointer to the dwo_unit object or NULL if we didn't find it
13758 (dwo_id mismatch or couldn't find the DWO/DWP file). */
13760 static struct dwo_unit *
13761 lookup_dwo_cutu (struct dwarf2_per_cu_data *this_unit,
13762 const char *dwo_name, const char *comp_dir,
13763 ULONGEST signature, int is_debug_types)
13765 struct dwarf2_per_objfile *dwarf2_per_objfile = this_unit->dwarf2_per_objfile;
13766 struct objfile *objfile = dwarf2_per_objfile->objfile;
13767 const char *kind = is_debug_types ? "TU" : "CU";
13768 void **dwo_file_slot;
13769 struct dwo_file *dwo_file;
13770 struct dwp_file *dwp_file;
13772 /* First see if there's a DWP file.
13773 If we have a DWP file but didn't find the DWO inside it, don't
13774 look for the original DWO file. It makes gdb behave differently
13775 depending on whether one is debugging in the build tree. */
13777 dwp_file = get_dwp_file (dwarf2_per_objfile);
13778 if (dwp_file != NULL)
13780 const struct dwp_hash_table *dwp_htab =
13781 is_debug_types ? dwp_file->tus : dwp_file->cus;
13783 if (dwp_htab != NULL)
13785 struct dwo_unit *dwo_cutu =
13786 lookup_dwo_unit_in_dwp (dwarf2_per_objfile, dwp_file, comp_dir,
13787 signature, is_debug_types);
13789 if (dwo_cutu != NULL)
13791 if (dwarf_read_debug)
13793 fprintf_unfiltered (gdb_stdlog,
13794 "Virtual DWO %s %s found: @%s\n",
13795 kind, hex_string (signature),
13796 host_address_to_string (dwo_cutu));
13804 /* No DWP file, look for the DWO file. */
13806 dwo_file_slot = lookup_dwo_file_slot (dwarf2_per_objfile,
13807 dwo_name, comp_dir);
13808 if (*dwo_file_slot == NULL)
13810 /* Read in the file and build a table of the CUs/TUs it contains. */
13811 *dwo_file_slot = open_and_init_dwo_file (this_unit, dwo_name, comp_dir);
13813 /* NOTE: This will be NULL if unable to open the file. */
13814 dwo_file = (struct dwo_file *) *dwo_file_slot;
13816 if (dwo_file != NULL)
13818 struct dwo_unit *dwo_cutu = NULL;
13820 if (is_debug_types && dwo_file->tus)
13822 struct dwo_unit find_dwo_cutu;
13824 memset (&find_dwo_cutu, 0, sizeof (find_dwo_cutu));
13825 find_dwo_cutu.signature = signature;
13827 = (struct dwo_unit *) htab_find (dwo_file->tus, &find_dwo_cutu);
13829 else if (!is_debug_types && dwo_file->cus)
13831 struct dwo_unit find_dwo_cutu;
13833 memset (&find_dwo_cutu, 0, sizeof (find_dwo_cutu));
13834 find_dwo_cutu.signature = signature;
13835 dwo_cutu = (struct dwo_unit *)htab_find (dwo_file->cus,
13839 if (dwo_cutu != NULL)
13841 if (dwarf_read_debug)
13843 fprintf_unfiltered (gdb_stdlog, "DWO %s %s(%s) found: @%s\n",
13844 kind, dwo_name, hex_string (signature),
13845 host_address_to_string (dwo_cutu));
13852 /* We didn't find it. This could mean a dwo_id mismatch, or
13853 someone deleted the DWO/DWP file, or the search path isn't set up
13854 correctly to find the file. */
13856 if (dwarf_read_debug)
13858 fprintf_unfiltered (gdb_stdlog, "DWO %s %s(%s) not found\n",
13859 kind, dwo_name, hex_string (signature));
13862 /* This is a warning and not a complaint because it can be caused by
13863 pilot error (e.g., user accidentally deleting the DWO). */
13865 /* Print the name of the DWP file if we looked there, helps the user
13866 better diagnose the problem. */
13867 std::string dwp_text;
13869 if (dwp_file != NULL)
13870 dwp_text = string_printf (" [in DWP file %s]",
13871 lbasename (dwp_file->name));
13873 warning (_("Could not find DWO %s %s(%s)%s referenced by %s at offset %s"
13874 " [in module %s]"),
13875 kind, dwo_name, hex_string (signature),
13877 this_unit->is_debug_types ? "TU" : "CU",
13878 sect_offset_str (this_unit->sect_off), objfile_name (objfile));
13883 /* Lookup the DWO CU DWO_NAME/SIGNATURE referenced from THIS_CU.
13884 See lookup_dwo_cutu_unit for details. */
13886 static struct dwo_unit *
13887 lookup_dwo_comp_unit (struct dwarf2_per_cu_data *this_cu,
13888 const char *dwo_name, const char *comp_dir,
13889 ULONGEST signature)
13891 return lookup_dwo_cutu (this_cu, dwo_name, comp_dir, signature, 0);
13894 /* Lookup the DWO TU DWO_NAME/SIGNATURE referenced from THIS_TU.
13895 See lookup_dwo_cutu_unit for details. */
13897 static struct dwo_unit *
13898 lookup_dwo_type_unit (struct signatured_type *this_tu,
13899 const char *dwo_name, const char *comp_dir)
13901 return lookup_dwo_cutu (&this_tu->per_cu, dwo_name, comp_dir, this_tu->signature, 1);
13904 /* Traversal function for queue_and_load_all_dwo_tus. */
13907 queue_and_load_dwo_tu (void **slot, void *info)
13909 struct dwo_unit *dwo_unit = (struct dwo_unit *) *slot;
13910 struct dwarf2_per_cu_data *per_cu = (struct dwarf2_per_cu_data *) info;
13911 ULONGEST signature = dwo_unit->signature;
13912 struct signatured_type *sig_type =
13913 lookup_dwo_signatured_type (per_cu->cu, signature);
13915 if (sig_type != NULL)
13917 struct dwarf2_per_cu_data *sig_cu = &sig_type->per_cu;
13919 /* We pass NULL for DEPENDENT_CU because we don't yet know if there's
13920 a real dependency of PER_CU on SIG_TYPE. That is detected later
13921 while processing PER_CU. */
13922 if (maybe_queue_comp_unit (NULL, sig_cu, per_cu->cu->language))
13923 load_full_type_unit (sig_cu);
13924 VEC_safe_push (dwarf2_per_cu_ptr, per_cu->imported_symtabs, sig_cu);
13930 /* Queue all TUs contained in the DWO of PER_CU to be read in.
13931 The DWO may have the only definition of the type, though it may not be
13932 referenced anywhere in PER_CU. Thus we have to load *all* its TUs.
13933 http://sourceware.org/bugzilla/show_bug.cgi?id=15021 */
13936 queue_and_load_all_dwo_tus (struct dwarf2_per_cu_data *per_cu)
13938 struct dwo_unit *dwo_unit;
13939 struct dwo_file *dwo_file;
13941 gdb_assert (!per_cu->is_debug_types);
13942 gdb_assert (get_dwp_file (per_cu->dwarf2_per_objfile) == NULL);
13943 gdb_assert (per_cu->cu != NULL);
13945 dwo_unit = per_cu->cu->dwo_unit;
13946 gdb_assert (dwo_unit != NULL);
13948 dwo_file = dwo_unit->dwo_file;
13949 if (dwo_file->tus != NULL)
13950 htab_traverse_noresize (dwo_file->tus, queue_and_load_dwo_tu, per_cu);
13953 /* Free all resources associated with DWO_FILE.
13954 Close the DWO file and munmap the sections.
13955 All memory should be on the objfile obstack. */
13958 free_dwo_file (struct dwo_file *dwo_file, struct objfile *objfile)
13961 /* Note: dbfd is NULL for virtual DWO files. */
13962 gdb_bfd_unref (dwo_file->dbfd);
13964 VEC_free (dwarf2_section_info_def, dwo_file->sections.types);
13967 /* Wrapper for free_dwo_file for use in cleanups. */
13970 free_dwo_file_cleanup (void *arg)
13972 struct free_dwo_file_cleanup_data *data
13973 = (struct free_dwo_file_cleanup_data *) arg;
13974 struct objfile *objfile = data->dwarf2_per_objfile->objfile;
13976 free_dwo_file (data->dwo_file, objfile);
13981 /* Traversal function for free_dwo_files. */
13984 free_dwo_file_from_slot (void **slot, void *info)
13986 struct dwo_file *dwo_file = (struct dwo_file *) *slot;
13987 struct objfile *objfile = (struct objfile *) info;
13989 free_dwo_file (dwo_file, objfile);
13994 /* Free all resources associated with DWO_FILES. */
13997 free_dwo_files (htab_t dwo_files, struct objfile *objfile)
13999 htab_traverse_noresize (dwo_files, free_dwo_file_from_slot, objfile);
14002 /* Read in various DIEs. */
14004 /* DW_AT_abstract_origin inherits whole DIEs (not just their attributes).
14005 Inherit only the children of the DW_AT_abstract_origin DIE not being
14006 already referenced by DW_AT_abstract_origin from the children of the
14010 inherit_abstract_dies (struct die_info *die, struct dwarf2_cu *cu)
14012 struct die_info *child_die;
14013 sect_offset *offsetp;
14014 /* Parent of DIE - referenced by DW_AT_abstract_origin. */
14015 struct die_info *origin_die;
14016 /* Iterator of the ORIGIN_DIE children. */
14017 struct die_info *origin_child_die;
14018 struct attribute *attr;
14019 struct dwarf2_cu *origin_cu;
14020 struct pending **origin_previous_list_in_scope;
14022 attr = dwarf2_attr (die, DW_AT_abstract_origin, cu);
14026 /* Note that following die references may follow to a die in a
14030 origin_die = follow_die_ref (die, attr, &origin_cu);
14032 /* We're inheriting ORIGIN's children into the scope we'd put DIE's
14034 origin_previous_list_in_scope = origin_cu->list_in_scope;
14035 origin_cu->list_in_scope = cu->list_in_scope;
14037 if (die->tag != origin_die->tag
14038 && !(die->tag == DW_TAG_inlined_subroutine
14039 && origin_die->tag == DW_TAG_subprogram))
14040 complaint (&symfile_complaints,
14041 _("DIE %s and its abstract origin %s have different tags"),
14042 sect_offset_str (die->sect_off),
14043 sect_offset_str (origin_die->sect_off));
14045 std::vector<sect_offset> offsets;
14047 for (child_die = die->child;
14048 child_die && child_die->tag;
14049 child_die = sibling_die (child_die))
14051 struct die_info *child_origin_die;
14052 struct dwarf2_cu *child_origin_cu;
14054 /* We are trying to process concrete instance entries:
14055 DW_TAG_call_site DIEs indeed have a DW_AT_abstract_origin tag, but
14056 it's not relevant to our analysis here. i.e. detecting DIEs that are
14057 present in the abstract instance but not referenced in the concrete
14059 if (child_die->tag == DW_TAG_call_site
14060 || child_die->tag == DW_TAG_GNU_call_site)
14063 /* For each CHILD_DIE, find the corresponding child of
14064 ORIGIN_DIE. If there is more than one layer of
14065 DW_AT_abstract_origin, follow them all; there shouldn't be,
14066 but GCC versions at least through 4.4 generate this (GCC PR
14068 child_origin_die = child_die;
14069 child_origin_cu = cu;
14072 attr = dwarf2_attr (child_origin_die, DW_AT_abstract_origin,
14076 child_origin_die = follow_die_ref (child_origin_die, attr,
14080 /* According to DWARF3 3.3.8.2 #3 new entries without their abstract
14081 counterpart may exist. */
14082 if (child_origin_die != child_die)
14084 if (child_die->tag != child_origin_die->tag
14085 && !(child_die->tag == DW_TAG_inlined_subroutine
14086 && child_origin_die->tag == DW_TAG_subprogram))
14087 complaint (&symfile_complaints,
14088 _("Child DIE %s and its abstract origin %s have "
14090 sect_offset_str (child_die->sect_off),
14091 sect_offset_str (child_origin_die->sect_off));
14092 if (child_origin_die->parent != origin_die)
14093 complaint (&symfile_complaints,
14094 _("Child DIE %s and its abstract origin %s have "
14095 "different parents"),
14096 sect_offset_str (child_die->sect_off),
14097 sect_offset_str (child_origin_die->sect_off));
14099 offsets.push_back (child_origin_die->sect_off);
14102 std::sort (offsets.begin (), offsets.end ());
14103 sect_offset *offsets_end = offsets.data () + offsets.size ();
14104 for (offsetp = offsets.data () + 1; offsetp < offsets_end; offsetp++)
14105 if (offsetp[-1] == *offsetp)
14106 complaint (&symfile_complaints,
14107 _("Multiple children of DIE %s refer "
14108 "to DIE %s as their abstract origin"),
14109 sect_offset_str (die->sect_off), sect_offset_str (*offsetp));
14111 offsetp = offsets.data ();
14112 origin_child_die = origin_die->child;
14113 while (origin_child_die && origin_child_die->tag)
14115 /* Is ORIGIN_CHILD_DIE referenced by any of the DIE children? */
14116 while (offsetp < offsets_end
14117 && *offsetp < origin_child_die->sect_off)
14119 if (offsetp >= offsets_end
14120 || *offsetp > origin_child_die->sect_off)
14122 /* Found that ORIGIN_CHILD_DIE is really not referenced.
14123 Check whether we're already processing ORIGIN_CHILD_DIE.
14124 This can happen with mutually referenced abstract_origins.
14126 if (!origin_child_die->in_process)
14127 process_die (origin_child_die, origin_cu);
14129 origin_child_die = sibling_die (origin_child_die);
14131 origin_cu->list_in_scope = origin_previous_list_in_scope;
14135 read_func_scope (struct die_info *die, struct dwarf2_cu *cu)
14137 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
14138 struct gdbarch *gdbarch = get_objfile_arch (objfile);
14139 struct context_stack *newobj;
14142 struct die_info *child_die;
14143 struct attribute *attr, *call_line, *call_file;
14145 CORE_ADDR baseaddr;
14146 struct block *block;
14147 int inlined_func = (die->tag == DW_TAG_inlined_subroutine);
14148 std::vector<struct symbol *> template_args;
14149 struct template_symbol *templ_func = NULL;
14153 /* If we do not have call site information, we can't show the
14154 caller of this inlined function. That's too confusing, so
14155 only use the scope for local variables. */
14156 call_line = dwarf2_attr (die, DW_AT_call_line, cu);
14157 call_file = dwarf2_attr (die, DW_AT_call_file, cu);
14158 if (call_line == NULL || call_file == NULL)
14160 read_lexical_block_scope (die, cu);
14165 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
14167 name = dwarf2_name (die, cu);
14169 /* Ignore functions with missing or empty names. These are actually
14170 illegal according to the DWARF standard. */
14173 complaint (&symfile_complaints,
14174 _("missing name for subprogram DIE at %s"),
14175 sect_offset_str (die->sect_off));
14179 /* Ignore functions with missing or invalid low and high pc attributes. */
14180 if (dwarf2_get_pc_bounds (die, &lowpc, &highpc, cu, NULL)
14181 <= PC_BOUNDS_INVALID)
14183 attr = dwarf2_attr (die, DW_AT_external, cu);
14184 if (!attr || !DW_UNSND (attr))
14185 complaint (&symfile_complaints,
14186 _("cannot get low and high bounds "
14187 "for subprogram DIE at %s"),
14188 sect_offset_str (die->sect_off));
14192 lowpc = gdbarch_adjust_dwarf2_addr (gdbarch, lowpc + baseaddr);
14193 highpc = gdbarch_adjust_dwarf2_addr (gdbarch, highpc + baseaddr);
14195 /* If we have any template arguments, then we must allocate a
14196 different sort of symbol. */
14197 for (child_die = die->child; child_die; child_die = sibling_die (child_die))
14199 if (child_die->tag == DW_TAG_template_type_param
14200 || child_die->tag == DW_TAG_template_value_param)
14202 templ_func = allocate_template_symbol (objfile);
14203 templ_func->subclass = SYMBOL_TEMPLATE;
14208 newobj = push_context (0, lowpc);
14209 newobj->name = new_symbol (die, read_type_die (die, cu), cu,
14210 (struct symbol *) templ_func);
14212 /* If there is a location expression for DW_AT_frame_base, record
14214 attr = dwarf2_attr (die, DW_AT_frame_base, cu);
14216 dwarf2_symbol_mark_computed (attr, newobj->name, cu, 1);
14218 /* If there is a location for the static link, record it. */
14219 newobj->static_link = NULL;
14220 attr = dwarf2_attr (die, DW_AT_static_link, cu);
14223 newobj->static_link
14224 = XOBNEW (&objfile->objfile_obstack, struct dynamic_prop);
14225 attr_to_dynamic_prop (attr, die, cu, newobj->static_link);
14228 cu->list_in_scope = &local_symbols;
14230 if (die->child != NULL)
14232 child_die = die->child;
14233 while (child_die && child_die->tag)
14235 if (child_die->tag == DW_TAG_template_type_param
14236 || child_die->tag == DW_TAG_template_value_param)
14238 struct symbol *arg = new_symbol (child_die, NULL, cu);
14241 template_args.push_back (arg);
14244 process_die (child_die, cu);
14245 child_die = sibling_die (child_die);
14249 inherit_abstract_dies (die, cu);
14251 /* If we have a DW_AT_specification, we might need to import using
14252 directives from the context of the specification DIE. See the
14253 comment in determine_prefix. */
14254 if (cu->language == language_cplus
14255 && dwarf2_attr (die, DW_AT_specification, cu))
14257 struct dwarf2_cu *spec_cu = cu;
14258 struct die_info *spec_die = die_specification (die, &spec_cu);
14262 child_die = spec_die->child;
14263 while (child_die && child_die->tag)
14265 if (child_die->tag == DW_TAG_imported_module)
14266 process_die (child_die, spec_cu);
14267 child_die = sibling_die (child_die);
14270 /* In some cases, GCC generates specification DIEs that
14271 themselves contain DW_AT_specification attributes. */
14272 spec_die = die_specification (spec_die, &spec_cu);
14276 newobj = pop_context ();
14277 /* Make a block for the local symbols within. */
14278 block = finish_block (newobj->name, &local_symbols, newobj->old_blocks,
14279 newobj->static_link, lowpc, highpc);
14281 /* For C++, set the block's scope. */
14282 if ((cu->language == language_cplus
14283 || cu->language == language_fortran
14284 || cu->language == language_d
14285 || cu->language == language_rust)
14286 && cu->processing_has_namespace_info)
14287 block_set_scope (block, determine_prefix (die, cu),
14288 &objfile->objfile_obstack);
14290 /* If we have address ranges, record them. */
14291 dwarf2_record_block_ranges (die, block, baseaddr, cu);
14293 gdbarch_make_symbol_special (gdbarch, newobj->name, objfile);
14295 /* Attach template arguments to function. */
14296 if (!template_args.empty ())
14298 gdb_assert (templ_func != NULL);
14300 templ_func->n_template_arguments = template_args.size ();
14301 templ_func->template_arguments
14302 = XOBNEWVEC (&objfile->objfile_obstack, struct symbol *,
14303 templ_func->n_template_arguments);
14304 memcpy (templ_func->template_arguments,
14305 template_args.data (),
14306 (templ_func->n_template_arguments * sizeof (struct symbol *)));
14309 /* In C++, we can have functions nested inside functions (e.g., when
14310 a function declares a class that has methods). This means that
14311 when we finish processing a function scope, we may need to go
14312 back to building a containing block's symbol lists. */
14313 local_symbols = newobj->locals;
14314 local_using_directives = newobj->local_using_directives;
14316 /* If we've finished processing a top-level function, subsequent
14317 symbols go in the file symbol list. */
14318 if (outermost_context_p ())
14319 cu->list_in_scope = &file_symbols;
14322 /* Process all the DIES contained within a lexical block scope. Start
14323 a new scope, process the dies, and then close the scope. */
14326 read_lexical_block_scope (struct die_info *die, struct dwarf2_cu *cu)
14328 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
14329 struct gdbarch *gdbarch = get_objfile_arch (objfile);
14330 struct context_stack *newobj;
14331 CORE_ADDR lowpc, highpc;
14332 struct die_info *child_die;
14333 CORE_ADDR baseaddr;
14335 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
14337 /* Ignore blocks with missing or invalid low and high pc attributes. */
14338 /* ??? Perhaps consider discontiguous blocks defined by DW_AT_ranges
14339 as multiple lexical blocks? Handling children in a sane way would
14340 be nasty. Might be easier to properly extend generic blocks to
14341 describe ranges. */
14342 switch (dwarf2_get_pc_bounds (die, &lowpc, &highpc, cu, NULL))
14344 case PC_BOUNDS_NOT_PRESENT:
14345 /* DW_TAG_lexical_block has no attributes, process its children as if
14346 there was no wrapping by that DW_TAG_lexical_block.
14347 GCC does no longer produces such DWARF since GCC r224161. */
14348 for (child_die = die->child;
14349 child_die != NULL && child_die->tag;
14350 child_die = sibling_die (child_die))
14351 process_die (child_die, cu);
14353 case PC_BOUNDS_INVALID:
14356 lowpc = gdbarch_adjust_dwarf2_addr (gdbarch, lowpc + baseaddr);
14357 highpc = gdbarch_adjust_dwarf2_addr (gdbarch, highpc + baseaddr);
14359 push_context (0, lowpc);
14360 if (die->child != NULL)
14362 child_die = die->child;
14363 while (child_die && child_die->tag)
14365 process_die (child_die, cu);
14366 child_die = sibling_die (child_die);
14369 inherit_abstract_dies (die, cu);
14370 newobj = pop_context ();
14372 if (local_symbols != NULL || local_using_directives != NULL)
14374 struct block *block
14375 = finish_block (0, &local_symbols, newobj->old_blocks, NULL,
14376 newobj->start_addr, highpc);
14378 /* Note that recording ranges after traversing children, as we
14379 do here, means that recording a parent's ranges entails
14380 walking across all its children's ranges as they appear in
14381 the address map, which is quadratic behavior.
14383 It would be nicer to record the parent's ranges before
14384 traversing its children, simply overriding whatever you find
14385 there. But since we don't even decide whether to create a
14386 block until after we've traversed its children, that's hard
14388 dwarf2_record_block_ranges (die, block, baseaddr, cu);
14390 local_symbols = newobj->locals;
14391 local_using_directives = newobj->local_using_directives;
14394 /* Read in DW_TAG_call_site and insert it to CU->call_site_htab. */
14397 read_call_site_scope (struct die_info *die, struct dwarf2_cu *cu)
14399 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
14400 struct gdbarch *gdbarch = get_objfile_arch (objfile);
14401 CORE_ADDR pc, baseaddr;
14402 struct attribute *attr;
14403 struct call_site *call_site, call_site_local;
14406 struct die_info *child_die;
14408 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
14410 attr = dwarf2_attr (die, DW_AT_call_return_pc, cu);
14413 /* This was a pre-DWARF-5 GNU extension alias
14414 for DW_AT_call_return_pc. */
14415 attr = dwarf2_attr (die, DW_AT_low_pc, cu);
14419 complaint (&symfile_complaints,
14420 _("missing DW_AT_call_return_pc for DW_TAG_call_site "
14421 "DIE %s [in module %s]"),
14422 sect_offset_str (die->sect_off), objfile_name (objfile));
14425 pc = attr_value_as_address (attr) + baseaddr;
14426 pc = gdbarch_adjust_dwarf2_addr (gdbarch, pc);
14428 if (cu->call_site_htab == NULL)
14429 cu->call_site_htab = htab_create_alloc_ex (16, core_addr_hash, core_addr_eq,
14430 NULL, &objfile->objfile_obstack,
14431 hashtab_obstack_allocate, NULL);
14432 call_site_local.pc = pc;
14433 slot = htab_find_slot (cu->call_site_htab, &call_site_local, INSERT);
14436 complaint (&symfile_complaints,
14437 _("Duplicate PC %s for DW_TAG_call_site "
14438 "DIE %s [in module %s]"),
14439 paddress (gdbarch, pc), sect_offset_str (die->sect_off),
14440 objfile_name (objfile));
14444 /* Count parameters at the caller. */
14447 for (child_die = die->child; child_die && child_die->tag;
14448 child_die = sibling_die (child_die))
14450 if (child_die->tag != DW_TAG_call_site_parameter
14451 && child_die->tag != DW_TAG_GNU_call_site_parameter)
14453 complaint (&symfile_complaints,
14454 _("Tag %d is not DW_TAG_call_site_parameter in "
14455 "DW_TAG_call_site child DIE %s [in module %s]"),
14456 child_die->tag, sect_offset_str (child_die->sect_off),
14457 objfile_name (objfile));
14465 = ((struct call_site *)
14466 obstack_alloc (&objfile->objfile_obstack,
14467 sizeof (*call_site)
14468 + (sizeof (*call_site->parameter) * (nparams - 1))));
14470 memset (call_site, 0, sizeof (*call_site) - sizeof (*call_site->parameter));
14471 call_site->pc = pc;
14473 if (dwarf2_flag_true_p (die, DW_AT_call_tail_call, cu)
14474 || dwarf2_flag_true_p (die, DW_AT_GNU_tail_call, cu))
14476 struct die_info *func_die;
14478 /* Skip also over DW_TAG_inlined_subroutine. */
14479 for (func_die = die->parent;
14480 func_die && func_die->tag != DW_TAG_subprogram
14481 && func_die->tag != DW_TAG_subroutine_type;
14482 func_die = func_die->parent);
14484 /* DW_AT_call_all_calls is a superset
14485 of DW_AT_call_all_tail_calls. */
14487 && !dwarf2_flag_true_p (func_die, DW_AT_call_all_calls, cu)
14488 && !dwarf2_flag_true_p (func_die, DW_AT_GNU_all_call_sites, cu)
14489 && !dwarf2_flag_true_p (func_die, DW_AT_call_all_tail_calls, cu)
14490 && !dwarf2_flag_true_p (func_die, DW_AT_GNU_all_tail_call_sites, cu))
14492 /* TYPE_TAIL_CALL_LIST is not interesting in functions where it is
14493 not complete. But keep CALL_SITE for look ups via call_site_htab,
14494 both the initial caller containing the real return address PC and
14495 the final callee containing the current PC of a chain of tail
14496 calls do not need to have the tail call list complete. But any
14497 function candidate for a virtual tail call frame searched via
14498 TYPE_TAIL_CALL_LIST must have the tail call list complete to be
14499 determined unambiguously. */
14503 struct type *func_type = NULL;
14506 func_type = get_die_type (func_die, cu);
14507 if (func_type != NULL)
14509 gdb_assert (TYPE_CODE (func_type) == TYPE_CODE_FUNC);
14511 /* Enlist this call site to the function. */
14512 call_site->tail_call_next = TYPE_TAIL_CALL_LIST (func_type);
14513 TYPE_TAIL_CALL_LIST (func_type) = call_site;
14516 complaint (&symfile_complaints,
14517 _("Cannot find function owning DW_TAG_call_site "
14518 "DIE %s [in module %s]"),
14519 sect_offset_str (die->sect_off), objfile_name (objfile));
14523 attr = dwarf2_attr (die, DW_AT_call_target, cu);
14525 attr = dwarf2_attr (die, DW_AT_GNU_call_site_target, cu);
14527 attr = dwarf2_attr (die, DW_AT_call_origin, cu);
14530 /* This was a pre-DWARF-5 GNU extension alias for DW_AT_call_origin. */
14531 attr = dwarf2_attr (die, DW_AT_abstract_origin, cu);
14533 SET_FIELD_DWARF_BLOCK (call_site->target, NULL);
14534 if (!attr || (attr_form_is_block (attr) && DW_BLOCK (attr)->size == 0))
14535 /* Keep NULL DWARF_BLOCK. */;
14536 else if (attr_form_is_block (attr))
14538 struct dwarf2_locexpr_baton *dlbaton;
14540 dlbaton = XOBNEW (&objfile->objfile_obstack, struct dwarf2_locexpr_baton);
14541 dlbaton->data = DW_BLOCK (attr)->data;
14542 dlbaton->size = DW_BLOCK (attr)->size;
14543 dlbaton->per_cu = cu->per_cu;
14545 SET_FIELD_DWARF_BLOCK (call_site->target, dlbaton);
14547 else if (attr_form_is_ref (attr))
14549 struct dwarf2_cu *target_cu = cu;
14550 struct die_info *target_die;
14552 target_die = follow_die_ref (die, attr, &target_cu);
14553 gdb_assert (target_cu->per_cu->dwarf2_per_objfile->objfile == objfile);
14554 if (die_is_declaration (target_die, target_cu))
14556 const char *target_physname;
14558 /* Prefer the mangled name; otherwise compute the demangled one. */
14559 target_physname = dw2_linkage_name (target_die, target_cu);
14560 if (target_physname == NULL)
14561 target_physname = dwarf2_physname (NULL, target_die, target_cu);
14562 if (target_physname == NULL)
14563 complaint (&symfile_complaints,
14564 _("DW_AT_call_target target DIE has invalid "
14565 "physname, for referencing DIE %s [in module %s]"),
14566 sect_offset_str (die->sect_off), objfile_name (objfile));
14568 SET_FIELD_PHYSNAME (call_site->target, target_physname);
14574 /* DW_AT_entry_pc should be preferred. */
14575 if (dwarf2_get_pc_bounds (target_die, &lowpc, NULL, target_cu, NULL)
14576 <= PC_BOUNDS_INVALID)
14577 complaint (&symfile_complaints,
14578 _("DW_AT_call_target target DIE has invalid "
14579 "low pc, for referencing DIE %s [in module %s]"),
14580 sect_offset_str (die->sect_off), objfile_name (objfile));
14583 lowpc = gdbarch_adjust_dwarf2_addr (gdbarch, lowpc + baseaddr);
14584 SET_FIELD_PHYSADDR (call_site->target, lowpc);
14589 complaint (&symfile_complaints,
14590 _("DW_TAG_call_site DW_AT_call_target is neither "
14591 "block nor reference, for DIE %s [in module %s]"),
14592 sect_offset_str (die->sect_off), objfile_name (objfile));
14594 call_site->per_cu = cu->per_cu;
14596 for (child_die = die->child;
14597 child_die && child_die->tag;
14598 child_die = sibling_die (child_die))
14600 struct call_site_parameter *parameter;
14601 struct attribute *loc, *origin;
14603 if (child_die->tag != DW_TAG_call_site_parameter
14604 && child_die->tag != DW_TAG_GNU_call_site_parameter)
14606 /* Already printed the complaint above. */
14610 gdb_assert (call_site->parameter_count < nparams);
14611 parameter = &call_site->parameter[call_site->parameter_count];
14613 /* DW_AT_location specifies the register number or DW_AT_abstract_origin
14614 specifies DW_TAG_formal_parameter. Value of the data assumed for the
14615 register is contained in DW_AT_call_value. */
14617 loc = dwarf2_attr (child_die, DW_AT_location, cu);
14618 origin = dwarf2_attr (child_die, DW_AT_call_parameter, cu);
14619 if (origin == NULL)
14621 /* This was a pre-DWARF-5 GNU extension alias
14622 for DW_AT_call_parameter. */
14623 origin = dwarf2_attr (child_die, DW_AT_abstract_origin, cu);
14625 if (loc == NULL && origin != NULL && attr_form_is_ref (origin))
14627 parameter->kind = CALL_SITE_PARAMETER_PARAM_OFFSET;
14629 sect_offset sect_off
14630 = (sect_offset) dwarf2_get_ref_die_offset (origin);
14631 if (!offset_in_cu_p (&cu->header, sect_off))
14633 /* As DW_OP_GNU_parameter_ref uses CU-relative offset this
14634 binding can be done only inside one CU. Such referenced DIE
14635 therefore cannot be even moved to DW_TAG_partial_unit. */
14636 complaint (&symfile_complaints,
14637 _("DW_AT_call_parameter offset is not in CU for "
14638 "DW_TAG_call_site child DIE %s [in module %s]"),
14639 sect_offset_str (child_die->sect_off),
14640 objfile_name (objfile));
14643 parameter->u.param_cu_off
14644 = (cu_offset) (sect_off - cu->header.sect_off);
14646 else if (loc == NULL || origin != NULL || !attr_form_is_block (loc))
14648 complaint (&symfile_complaints,
14649 _("No DW_FORM_block* DW_AT_location for "
14650 "DW_TAG_call_site child DIE %s [in module %s]"),
14651 sect_offset_str (child_die->sect_off), objfile_name (objfile));
14656 parameter->u.dwarf_reg = dwarf_block_to_dwarf_reg
14657 (DW_BLOCK (loc)->data, &DW_BLOCK (loc)->data[DW_BLOCK (loc)->size]);
14658 if (parameter->u.dwarf_reg != -1)
14659 parameter->kind = CALL_SITE_PARAMETER_DWARF_REG;
14660 else if (dwarf_block_to_sp_offset (gdbarch, DW_BLOCK (loc)->data,
14661 &DW_BLOCK (loc)->data[DW_BLOCK (loc)->size],
14662 ¶meter->u.fb_offset))
14663 parameter->kind = CALL_SITE_PARAMETER_FB_OFFSET;
14666 complaint (&symfile_complaints,
14667 _("Only single DW_OP_reg or DW_OP_fbreg is supported "
14668 "for DW_FORM_block* DW_AT_location is supported for "
14669 "DW_TAG_call_site child DIE %s "
14671 sect_offset_str (child_die->sect_off),
14672 objfile_name (objfile));
14677 attr = dwarf2_attr (child_die, DW_AT_call_value, cu);
14679 attr = dwarf2_attr (child_die, DW_AT_GNU_call_site_value, cu);
14680 if (!attr_form_is_block (attr))
14682 complaint (&symfile_complaints,
14683 _("No DW_FORM_block* DW_AT_call_value for "
14684 "DW_TAG_call_site child DIE %s [in module %s]"),
14685 sect_offset_str (child_die->sect_off),
14686 objfile_name (objfile));
14689 parameter->value = DW_BLOCK (attr)->data;
14690 parameter->value_size = DW_BLOCK (attr)->size;
14692 /* Parameters are not pre-cleared by memset above. */
14693 parameter->data_value = NULL;
14694 parameter->data_value_size = 0;
14695 call_site->parameter_count++;
14697 attr = dwarf2_attr (child_die, DW_AT_call_data_value, cu);
14699 attr = dwarf2_attr (child_die, DW_AT_GNU_call_site_data_value, cu);
14702 if (!attr_form_is_block (attr))
14703 complaint (&symfile_complaints,
14704 _("No DW_FORM_block* DW_AT_call_data_value for "
14705 "DW_TAG_call_site child DIE %s [in module %s]"),
14706 sect_offset_str (child_die->sect_off),
14707 objfile_name (objfile));
14710 parameter->data_value = DW_BLOCK (attr)->data;
14711 parameter->data_value_size = DW_BLOCK (attr)->size;
14717 /* Helper function for read_variable. If DIE represents a virtual
14718 table, then return the type of the concrete object that is
14719 associated with the virtual table. Otherwise, return NULL. */
14721 static struct type *
14722 rust_containing_type (struct die_info *die, struct dwarf2_cu *cu)
14724 struct attribute *attr = dwarf2_attr (die, DW_AT_type, cu);
14728 /* Find the type DIE. */
14729 struct die_info *type_die = NULL;
14730 struct dwarf2_cu *type_cu = cu;
14732 if (attr_form_is_ref (attr))
14733 type_die = follow_die_ref (die, attr, &type_cu);
14734 if (type_die == NULL)
14737 if (dwarf2_attr (type_die, DW_AT_containing_type, type_cu) == NULL)
14739 return die_containing_type (type_die, type_cu);
14742 /* Read a variable (DW_TAG_variable) DIE and create a new symbol. */
14745 read_variable (struct die_info *die, struct dwarf2_cu *cu)
14747 struct rust_vtable_symbol *storage = NULL;
14749 if (cu->language == language_rust)
14751 struct type *containing_type = rust_containing_type (die, cu);
14753 if (containing_type != NULL)
14755 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
14757 storage = OBSTACK_ZALLOC (&objfile->objfile_obstack,
14758 struct rust_vtable_symbol);
14759 initialize_objfile_symbol (storage);
14760 storage->concrete_type = containing_type;
14761 storage->subclass = SYMBOL_RUST_VTABLE;
14765 new_symbol (die, NULL, cu, storage);
14768 /* Call CALLBACK from DW_AT_ranges attribute value OFFSET
14769 reading .debug_rnglists.
14770 Callback's type should be:
14771 void (CORE_ADDR range_beginning, CORE_ADDR range_end)
14772 Return true if the attributes are present and valid, otherwise,
14775 template <typename Callback>
14777 dwarf2_rnglists_process (unsigned offset, struct dwarf2_cu *cu,
14778 Callback &&callback)
14780 struct dwarf2_per_objfile *dwarf2_per_objfile
14781 = cu->per_cu->dwarf2_per_objfile;
14782 struct objfile *objfile = dwarf2_per_objfile->objfile;
14783 bfd *obfd = objfile->obfd;
14784 /* Base address selection entry. */
14787 const gdb_byte *buffer;
14788 CORE_ADDR baseaddr;
14789 bool overflow = false;
14791 found_base = cu->base_known;
14792 base = cu->base_address;
14794 dwarf2_read_section (objfile, &dwarf2_per_objfile->rnglists);
14795 if (offset >= dwarf2_per_objfile->rnglists.size)
14797 complaint (&symfile_complaints,
14798 _("Offset %d out of bounds for DW_AT_ranges attribute"),
14802 buffer = dwarf2_per_objfile->rnglists.buffer + offset;
14804 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
14808 /* Initialize it due to a false compiler warning. */
14809 CORE_ADDR range_beginning = 0, range_end = 0;
14810 const gdb_byte *buf_end = (dwarf2_per_objfile->rnglists.buffer
14811 + dwarf2_per_objfile->rnglists.size);
14812 unsigned int bytes_read;
14814 if (buffer == buf_end)
14819 const auto rlet = static_cast<enum dwarf_range_list_entry>(*buffer++);
14822 case DW_RLE_end_of_list:
14824 case DW_RLE_base_address:
14825 if (buffer + cu->header.addr_size > buf_end)
14830 base = read_address (obfd, buffer, cu, &bytes_read);
14832 buffer += bytes_read;
14834 case DW_RLE_start_length:
14835 if (buffer + cu->header.addr_size > buf_end)
14840 range_beginning = read_address (obfd, buffer, cu, &bytes_read);
14841 buffer += bytes_read;
14842 range_end = (range_beginning
14843 + read_unsigned_leb128 (obfd, buffer, &bytes_read));
14844 buffer += bytes_read;
14845 if (buffer > buf_end)
14851 case DW_RLE_offset_pair:
14852 range_beginning = read_unsigned_leb128 (obfd, buffer, &bytes_read);
14853 buffer += bytes_read;
14854 if (buffer > buf_end)
14859 range_end = read_unsigned_leb128 (obfd, buffer, &bytes_read);
14860 buffer += bytes_read;
14861 if (buffer > buf_end)
14867 case DW_RLE_start_end:
14868 if (buffer + 2 * cu->header.addr_size > buf_end)
14873 range_beginning = read_address (obfd, buffer, cu, &bytes_read);
14874 buffer += bytes_read;
14875 range_end = read_address (obfd, buffer, cu, &bytes_read);
14876 buffer += bytes_read;
14879 complaint (&symfile_complaints,
14880 _("Invalid .debug_rnglists data (no base address)"));
14883 if (rlet == DW_RLE_end_of_list || overflow)
14885 if (rlet == DW_RLE_base_address)
14890 /* We have no valid base address for the ranges
14892 complaint (&symfile_complaints,
14893 _("Invalid .debug_rnglists data (no base address)"));
14897 if (range_beginning > range_end)
14899 /* Inverted range entries are invalid. */
14900 complaint (&symfile_complaints,
14901 _("Invalid .debug_rnglists data (inverted range)"));
14905 /* Empty range entries have no effect. */
14906 if (range_beginning == range_end)
14909 range_beginning += base;
14912 /* A not-uncommon case of bad debug info.
14913 Don't pollute the addrmap with bad data. */
14914 if (range_beginning + baseaddr == 0
14915 && !dwarf2_per_objfile->has_section_at_zero)
14917 complaint (&symfile_complaints,
14918 _(".debug_rnglists entry has start address of zero"
14919 " [in module %s]"), objfile_name (objfile));
14923 callback (range_beginning, range_end);
14928 complaint (&symfile_complaints,
14929 _("Offset %d is not terminated "
14930 "for DW_AT_ranges attribute"),
14938 /* Call CALLBACK from DW_AT_ranges attribute value OFFSET reading .debug_ranges.
14939 Callback's type should be:
14940 void (CORE_ADDR range_beginning, CORE_ADDR range_end)
14941 Return 1 if the attributes are present and valid, otherwise, return 0. */
14943 template <typename Callback>
14945 dwarf2_ranges_process (unsigned offset, struct dwarf2_cu *cu,
14946 Callback &&callback)
14948 struct dwarf2_per_objfile *dwarf2_per_objfile
14949 = cu->per_cu->dwarf2_per_objfile;
14950 struct objfile *objfile = dwarf2_per_objfile->objfile;
14951 struct comp_unit_head *cu_header = &cu->header;
14952 bfd *obfd = objfile->obfd;
14953 unsigned int addr_size = cu_header->addr_size;
14954 CORE_ADDR mask = ~(~(CORE_ADDR)1 << (addr_size * 8 - 1));
14955 /* Base address selection entry. */
14958 unsigned int dummy;
14959 const gdb_byte *buffer;
14960 CORE_ADDR baseaddr;
14962 if (cu_header->version >= 5)
14963 return dwarf2_rnglists_process (offset, cu, callback);
14965 found_base = cu->base_known;
14966 base = cu->base_address;
14968 dwarf2_read_section (objfile, &dwarf2_per_objfile->ranges);
14969 if (offset >= dwarf2_per_objfile->ranges.size)
14971 complaint (&symfile_complaints,
14972 _("Offset %d out of bounds for DW_AT_ranges attribute"),
14976 buffer = dwarf2_per_objfile->ranges.buffer + offset;
14978 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
14982 CORE_ADDR range_beginning, range_end;
14984 range_beginning = read_address (obfd, buffer, cu, &dummy);
14985 buffer += addr_size;
14986 range_end = read_address (obfd, buffer, cu, &dummy);
14987 buffer += addr_size;
14988 offset += 2 * addr_size;
14990 /* An end of list marker is a pair of zero addresses. */
14991 if (range_beginning == 0 && range_end == 0)
14992 /* Found the end of list entry. */
14995 /* Each base address selection entry is a pair of 2 values.
14996 The first is the largest possible address, the second is
14997 the base address. Check for a base address here. */
14998 if ((range_beginning & mask) == mask)
15000 /* If we found the largest possible address, then we already
15001 have the base address in range_end. */
15009 /* We have no valid base address for the ranges
15011 complaint (&symfile_complaints,
15012 _("Invalid .debug_ranges data (no base address)"));
15016 if (range_beginning > range_end)
15018 /* Inverted range entries are invalid. */
15019 complaint (&symfile_complaints,
15020 _("Invalid .debug_ranges data (inverted range)"));
15024 /* Empty range entries have no effect. */
15025 if (range_beginning == range_end)
15028 range_beginning += base;
15031 /* A not-uncommon case of bad debug info.
15032 Don't pollute the addrmap with bad data. */
15033 if (range_beginning + baseaddr == 0
15034 && !dwarf2_per_objfile->has_section_at_zero)
15036 complaint (&symfile_complaints,
15037 _(".debug_ranges entry has start address of zero"
15038 " [in module %s]"), objfile_name (objfile));
15042 callback (range_beginning, range_end);
15048 /* Get low and high pc attributes from DW_AT_ranges attribute value OFFSET.
15049 Return 1 if the attributes are present and valid, otherwise, return 0.
15050 If RANGES_PST is not NULL we should setup `objfile->psymtabs_addrmap'. */
15053 dwarf2_ranges_read (unsigned offset, CORE_ADDR *low_return,
15054 CORE_ADDR *high_return, struct dwarf2_cu *cu,
15055 struct partial_symtab *ranges_pst)
15057 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
15058 struct gdbarch *gdbarch = get_objfile_arch (objfile);
15059 const CORE_ADDR baseaddr = ANOFFSET (objfile->section_offsets,
15060 SECT_OFF_TEXT (objfile));
15063 CORE_ADDR high = 0;
15066 retval = dwarf2_ranges_process (offset, cu,
15067 [&] (CORE_ADDR range_beginning, CORE_ADDR range_end)
15069 if (ranges_pst != NULL)
15074 lowpc = gdbarch_adjust_dwarf2_addr (gdbarch,
15075 range_beginning + baseaddr);
15076 highpc = gdbarch_adjust_dwarf2_addr (gdbarch,
15077 range_end + baseaddr);
15078 addrmap_set_empty (objfile->psymtabs_addrmap, lowpc, highpc - 1,
15082 /* FIXME: This is recording everything as a low-high
15083 segment of consecutive addresses. We should have a
15084 data structure for discontiguous block ranges
15088 low = range_beginning;
15094 if (range_beginning < low)
15095 low = range_beginning;
15096 if (range_end > high)
15104 /* If the first entry is an end-of-list marker, the range
15105 describes an empty scope, i.e. no instructions. */
15111 *high_return = high;
15115 /* Get low and high pc attributes from a die. See enum pc_bounds_kind
15116 definition for the return value. *LOWPC and *HIGHPC are set iff
15117 neither PC_BOUNDS_NOT_PRESENT nor PC_BOUNDS_INVALID are returned. */
15119 static enum pc_bounds_kind
15120 dwarf2_get_pc_bounds (struct die_info *die, CORE_ADDR *lowpc,
15121 CORE_ADDR *highpc, struct dwarf2_cu *cu,
15122 struct partial_symtab *pst)
15124 struct dwarf2_per_objfile *dwarf2_per_objfile
15125 = cu->per_cu->dwarf2_per_objfile;
15126 struct attribute *attr;
15127 struct attribute *attr_high;
15129 CORE_ADDR high = 0;
15130 enum pc_bounds_kind ret;
15132 attr_high = dwarf2_attr (die, DW_AT_high_pc, cu);
15135 attr = dwarf2_attr (die, DW_AT_low_pc, cu);
15138 low = attr_value_as_address (attr);
15139 high = attr_value_as_address (attr_high);
15140 if (cu->header.version >= 4 && attr_form_is_constant (attr_high))
15144 /* Found high w/o low attribute. */
15145 return PC_BOUNDS_INVALID;
15147 /* Found consecutive range of addresses. */
15148 ret = PC_BOUNDS_HIGH_LOW;
15152 attr = dwarf2_attr (die, DW_AT_ranges, cu);
15155 /* DW_AT_ranges_base does not apply to DIEs from the DWO skeleton.
15156 We take advantage of the fact that DW_AT_ranges does not appear
15157 in DW_TAG_compile_unit of DWO files. */
15158 int need_ranges_base = die->tag != DW_TAG_compile_unit;
15159 unsigned int ranges_offset = (DW_UNSND (attr)
15160 + (need_ranges_base
15164 /* Value of the DW_AT_ranges attribute is the offset in the
15165 .debug_ranges section. */
15166 if (!dwarf2_ranges_read (ranges_offset, &low, &high, cu, pst))
15167 return PC_BOUNDS_INVALID;
15168 /* Found discontinuous range of addresses. */
15169 ret = PC_BOUNDS_RANGES;
15172 return PC_BOUNDS_NOT_PRESENT;
15175 /* partial_die_info::read has also the strict LOW < HIGH requirement. */
15177 return PC_BOUNDS_INVALID;
15179 /* When using the GNU linker, .gnu.linkonce. sections are used to
15180 eliminate duplicate copies of functions and vtables and such.
15181 The linker will arbitrarily choose one and discard the others.
15182 The AT_*_pc values for such functions refer to local labels in
15183 these sections. If the section from that file was discarded, the
15184 labels are not in the output, so the relocs get a value of 0.
15185 If this is a discarded function, mark the pc bounds as invalid,
15186 so that GDB will ignore it. */
15187 if (low == 0 && !dwarf2_per_objfile->has_section_at_zero)
15188 return PC_BOUNDS_INVALID;
15196 /* Assuming that DIE represents a subprogram DIE or a lexical block, get
15197 its low and high PC addresses. Do nothing if these addresses could not
15198 be determined. Otherwise, set LOWPC to the low address if it is smaller,
15199 and HIGHPC to the high address if greater than HIGHPC. */
15202 dwarf2_get_subprogram_pc_bounds (struct die_info *die,
15203 CORE_ADDR *lowpc, CORE_ADDR *highpc,
15204 struct dwarf2_cu *cu)
15206 CORE_ADDR low, high;
15207 struct die_info *child = die->child;
15209 if (dwarf2_get_pc_bounds (die, &low, &high, cu, NULL) >= PC_BOUNDS_RANGES)
15211 *lowpc = std::min (*lowpc, low);
15212 *highpc = std::max (*highpc, high);
15215 /* If the language does not allow nested subprograms (either inside
15216 subprograms or lexical blocks), we're done. */
15217 if (cu->language != language_ada)
15220 /* Check all the children of the given DIE. If it contains nested
15221 subprograms, then check their pc bounds. Likewise, we need to
15222 check lexical blocks as well, as they may also contain subprogram
15224 while (child && child->tag)
15226 if (child->tag == DW_TAG_subprogram
15227 || child->tag == DW_TAG_lexical_block)
15228 dwarf2_get_subprogram_pc_bounds (child, lowpc, highpc, cu);
15229 child = sibling_die (child);
15233 /* Get the low and high pc's represented by the scope DIE, and store
15234 them in *LOWPC and *HIGHPC. If the correct values can't be
15235 determined, set *LOWPC to -1 and *HIGHPC to 0. */
15238 get_scope_pc_bounds (struct die_info *die,
15239 CORE_ADDR *lowpc, CORE_ADDR *highpc,
15240 struct dwarf2_cu *cu)
15242 CORE_ADDR best_low = (CORE_ADDR) -1;
15243 CORE_ADDR best_high = (CORE_ADDR) 0;
15244 CORE_ADDR current_low, current_high;
15246 if (dwarf2_get_pc_bounds (die, ¤t_low, ¤t_high, cu, NULL)
15247 >= PC_BOUNDS_RANGES)
15249 best_low = current_low;
15250 best_high = current_high;
15254 struct die_info *child = die->child;
15256 while (child && child->tag)
15258 switch (child->tag) {
15259 case DW_TAG_subprogram:
15260 dwarf2_get_subprogram_pc_bounds (child, &best_low, &best_high, cu);
15262 case DW_TAG_namespace:
15263 case DW_TAG_module:
15264 /* FIXME: carlton/2004-01-16: Should we do this for
15265 DW_TAG_class_type/DW_TAG_structure_type, too? I think
15266 that current GCC's always emit the DIEs corresponding
15267 to definitions of methods of classes as children of a
15268 DW_TAG_compile_unit or DW_TAG_namespace (as opposed to
15269 the DIEs giving the declarations, which could be
15270 anywhere). But I don't see any reason why the
15271 standards says that they have to be there. */
15272 get_scope_pc_bounds (child, ¤t_low, ¤t_high, cu);
15274 if (current_low != ((CORE_ADDR) -1))
15276 best_low = std::min (best_low, current_low);
15277 best_high = std::max (best_high, current_high);
15285 child = sibling_die (child);
15290 *highpc = best_high;
15293 /* Record the address ranges for BLOCK, offset by BASEADDR, as given
15297 dwarf2_record_block_ranges (struct die_info *die, struct block *block,
15298 CORE_ADDR baseaddr, struct dwarf2_cu *cu)
15300 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
15301 struct gdbarch *gdbarch = get_objfile_arch (objfile);
15302 struct attribute *attr;
15303 struct attribute *attr_high;
15305 attr_high = dwarf2_attr (die, DW_AT_high_pc, cu);
15308 attr = dwarf2_attr (die, DW_AT_low_pc, cu);
15311 CORE_ADDR low = attr_value_as_address (attr);
15312 CORE_ADDR high = attr_value_as_address (attr_high);
15314 if (cu->header.version >= 4 && attr_form_is_constant (attr_high))
15317 low = gdbarch_adjust_dwarf2_addr (gdbarch, low + baseaddr);
15318 high = gdbarch_adjust_dwarf2_addr (gdbarch, high + baseaddr);
15319 record_block_range (block, low, high - 1);
15323 attr = dwarf2_attr (die, DW_AT_ranges, cu);
15326 /* DW_AT_ranges_base does not apply to DIEs from the DWO skeleton.
15327 We take advantage of the fact that DW_AT_ranges does not appear
15328 in DW_TAG_compile_unit of DWO files. */
15329 int need_ranges_base = die->tag != DW_TAG_compile_unit;
15331 /* The value of the DW_AT_ranges attribute is the offset of the
15332 address range list in the .debug_ranges section. */
15333 unsigned long offset = (DW_UNSND (attr)
15334 + (need_ranges_base ? cu->ranges_base : 0));
15335 const gdb_byte *buffer;
15337 /* For some target architectures, but not others, the
15338 read_address function sign-extends the addresses it returns.
15339 To recognize base address selection entries, we need a
15341 unsigned int addr_size = cu->header.addr_size;
15342 CORE_ADDR base_select_mask = ~(~(CORE_ADDR)1 << (addr_size * 8 - 1));
15344 /* The base address, to which the next pair is relative. Note
15345 that this 'base' is a DWARF concept: most entries in a range
15346 list are relative, to reduce the number of relocs against the
15347 debugging information. This is separate from this function's
15348 'baseaddr' argument, which GDB uses to relocate debugging
15349 information from a shared library based on the address at
15350 which the library was loaded. */
15351 CORE_ADDR base = cu->base_address;
15352 int base_known = cu->base_known;
15354 dwarf2_ranges_process (offset, cu,
15355 [&] (CORE_ADDR start, CORE_ADDR end)
15359 start = gdbarch_adjust_dwarf2_addr (gdbarch, start);
15360 end = gdbarch_adjust_dwarf2_addr (gdbarch, end);
15361 record_block_range (block, start, end - 1);
15366 /* Check whether the producer field indicates either of GCC < 4.6, or the
15367 Intel C/C++ compiler, and cache the result in CU. */
15370 check_producer (struct dwarf2_cu *cu)
15374 if (cu->producer == NULL)
15376 /* For unknown compilers expect their behavior is DWARF version
15379 GCC started to support .debug_types sections by -gdwarf-4 since
15380 gcc-4.5.x. As the .debug_types sections are missing DW_AT_producer
15381 for their space efficiency GDB cannot workaround gcc-4.5.x -gdwarf-4
15382 combination. gcc-4.5.x -gdwarf-4 binaries have DW_AT_accessibility
15383 interpreted incorrectly by GDB now - GCC PR debug/48229. */
15385 else if (producer_is_gcc (cu->producer, &major, &minor))
15387 cu->producer_is_gxx_lt_4_6 = major < 4 || (major == 4 && minor < 6);
15388 cu->producer_is_gcc_lt_4_3 = major < 4 || (major == 4 && minor < 3);
15390 else if (producer_is_icc (cu->producer, &major, &minor))
15391 cu->producer_is_icc_lt_14 = major < 14;
15394 /* For other non-GCC compilers, expect their behavior is DWARF version
15398 cu->checked_producer = 1;
15401 /* Check for GCC PR debug/45124 fix which is not present in any G++ version up
15402 to 4.5.any while it is present already in G++ 4.6.0 - the PR has been fixed
15403 during 4.6.0 experimental. */
15406 producer_is_gxx_lt_4_6 (struct dwarf2_cu *cu)
15408 if (!cu->checked_producer)
15409 check_producer (cu);
15411 return cu->producer_is_gxx_lt_4_6;
15414 /* Return the default accessibility type if it is not overriden by
15415 DW_AT_accessibility. */
15417 static enum dwarf_access_attribute
15418 dwarf2_default_access_attribute (struct die_info *die, struct dwarf2_cu *cu)
15420 if (cu->header.version < 3 || producer_is_gxx_lt_4_6 (cu))
15422 /* The default DWARF 2 accessibility for members is public, the default
15423 accessibility for inheritance is private. */
15425 if (die->tag != DW_TAG_inheritance)
15426 return DW_ACCESS_public;
15428 return DW_ACCESS_private;
15432 /* DWARF 3+ defines the default accessibility a different way. The same
15433 rules apply now for DW_TAG_inheritance as for the members and it only
15434 depends on the container kind. */
15436 if (die->parent->tag == DW_TAG_class_type)
15437 return DW_ACCESS_private;
15439 return DW_ACCESS_public;
15443 /* Look for DW_AT_data_member_location. Set *OFFSET to the byte
15444 offset. If the attribute was not found return 0, otherwise return
15445 1. If it was found but could not properly be handled, set *OFFSET
15449 handle_data_member_location (struct die_info *die, struct dwarf2_cu *cu,
15452 struct attribute *attr;
15454 attr = dwarf2_attr (die, DW_AT_data_member_location, cu);
15459 /* Note that we do not check for a section offset first here.
15460 This is because DW_AT_data_member_location is new in DWARF 4,
15461 so if we see it, we can assume that a constant form is really
15462 a constant and not a section offset. */
15463 if (attr_form_is_constant (attr))
15464 *offset = dwarf2_get_attr_constant_value (attr, 0);
15465 else if (attr_form_is_section_offset (attr))
15466 dwarf2_complex_location_expr_complaint ();
15467 else if (attr_form_is_block (attr))
15468 *offset = decode_locdesc (DW_BLOCK (attr), cu);
15470 dwarf2_complex_location_expr_complaint ();
15478 /* Add an aggregate field to the field list. */
15481 dwarf2_add_field (struct field_info *fip, struct die_info *die,
15482 struct dwarf2_cu *cu)
15484 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
15485 struct gdbarch *gdbarch = get_objfile_arch (objfile);
15486 struct nextfield *new_field;
15487 struct attribute *attr;
15489 const char *fieldname = "";
15491 /* Allocate a new field list entry and link it in. */
15492 new_field = XNEW (struct nextfield);
15493 make_cleanup (xfree, new_field);
15494 memset (new_field, 0, sizeof (struct nextfield));
15496 if (die->tag == DW_TAG_inheritance)
15498 new_field->next = fip->baseclasses;
15499 fip->baseclasses = new_field;
15503 new_field->next = fip->fields;
15504 fip->fields = new_field;
15508 attr = dwarf2_attr (die, DW_AT_accessibility, cu);
15510 new_field->accessibility = DW_UNSND (attr);
15512 new_field->accessibility = dwarf2_default_access_attribute (die, cu);
15513 if (new_field->accessibility != DW_ACCESS_public)
15514 fip->non_public_fields = 1;
15516 attr = dwarf2_attr (die, DW_AT_virtuality, cu);
15518 new_field->virtuality = DW_UNSND (attr);
15520 new_field->virtuality = DW_VIRTUALITY_none;
15522 fp = &new_field->field;
15524 if (die->tag == DW_TAG_member && ! die_is_declaration (die, cu))
15528 /* Data member other than a C++ static data member. */
15530 /* Get type of field. */
15531 fp->type = die_type (die, cu);
15533 SET_FIELD_BITPOS (*fp, 0);
15535 /* Get bit size of field (zero if none). */
15536 attr = dwarf2_attr (die, DW_AT_bit_size, cu);
15539 FIELD_BITSIZE (*fp) = DW_UNSND (attr);
15543 FIELD_BITSIZE (*fp) = 0;
15546 /* Get bit offset of field. */
15547 if (handle_data_member_location (die, cu, &offset))
15548 SET_FIELD_BITPOS (*fp, offset * bits_per_byte);
15549 attr = dwarf2_attr (die, DW_AT_bit_offset, cu);
15552 if (gdbarch_bits_big_endian (gdbarch))
15554 /* For big endian bits, the DW_AT_bit_offset gives the
15555 additional bit offset from the MSB of the containing
15556 anonymous object to the MSB of the field. We don't
15557 have to do anything special since we don't need to
15558 know the size of the anonymous object. */
15559 SET_FIELD_BITPOS (*fp, FIELD_BITPOS (*fp) + DW_UNSND (attr));
15563 /* For little endian bits, compute the bit offset to the
15564 MSB of the anonymous object, subtract off the number of
15565 bits from the MSB of the field to the MSB of the
15566 object, and then subtract off the number of bits of
15567 the field itself. The result is the bit offset of
15568 the LSB of the field. */
15569 int anonymous_size;
15570 int bit_offset = DW_UNSND (attr);
15572 attr = dwarf2_attr (die, DW_AT_byte_size, cu);
15575 /* The size of the anonymous object containing
15576 the bit field is explicit, so use the
15577 indicated size (in bytes). */
15578 anonymous_size = DW_UNSND (attr);
15582 /* The size of the anonymous object containing
15583 the bit field must be inferred from the type
15584 attribute of the data member containing the
15586 anonymous_size = TYPE_LENGTH (fp->type);
15588 SET_FIELD_BITPOS (*fp,
15589 (FIELD_BITPOS (*fp)
15590 + anonymous_size * bits_per_byte
15591 - bit_offset - FIELD_BITSIZE (*fp)));
15594 attr = dwarf2_attr (die, DW_AT_data_bit_offset, cu);
15596 SET_FIELD_BITPOS (*fp, (FIELD_BITPOS (*fp)
15597 + dwarf2_get_attr_constant_value (attr, 0)));
15599 /* Get name of field. */
15600 fieldname = dwarf2_name (die, cu);
15601 if (fieldname == NULL)
15604 /* The name is already allocated along with this objfile, so we don't
15605 need to duplicate it for the type. */
15606 fp->name = fieldname;
15608 /* Change accessibility for artificial fields (e.g. virtual table
15609 pointer or virtual base class pointer) to private. */
15610 if (dwarf2_attr (die, DW_AT_artificial, cu))
15612 FIELD_ARTIFICIAL (*fp) = 1;
15613 new_field->accessibility = DW_ACCESS_private;
15614 fip->non_public_fields = 1;
15617 else if (die->tag == DW_TAG_member || die->tag == DW_TAG_variable)
15619 /* C++ static member. */
15621 /* NOTE: carlton/2002-11-05: It should be a DW_TAG_member that
15622 is a declaration, but all versions of G++ as of this writing
15623 (so through at least 3.2.1) incorrectly generate
15624 DW_TAG_variable tags. */
15626 const char *physname;
15628 /* Get name of field. */
15629 fieldname = dwarf2_name (die, cu);
15630 if (fieldname == NULL)
15633 attr = dwarf2_attr (die, DW_AT_const_value, cu);
15635 /* Only create a symbol if this is an external value.
15636 new_symbol checks this and puts the value in the global symbol
15637 table, which we want. If it is not external, new_symbol
15638 will try to put the value in cu->list_in_scope which is wrong. */
15639 && dwarf2_flag_true_p (die, DW_AT_external, cu))
15641 /* A static const member, not much different than an enum as far as
15642 we're concerned, except that we can support more types. */
15643 new_symbol (die, NULL, cu);
15646 /* Get physical name. */
15647 physname = dwarf2_physname (fieldname, die, cu);
15649 /* The name is already allocated along with this objfile, so we don't
15650 need to duplicate it for the type. */
15651 SET_FIELD_PHYSNAME (*fp, physname ? physname : "");
15652 FIELD_TYPE (*fp) = die_type (die, cu);
15653 FIELD_NAME (*fp) = fieldname;
15655 else if (die->tag == DW_TAG_inheritance)
15659 /* C++ base class field. */
15660 if (handle_data_member_location (die, cu, &offset))
15661 SET_FIELD_BITPOS (*fp, offset * bits_per_byte);
15662 FIELD_BITSIZE (*fp) = 0;
15663 FIELD_TYPE (*fp) = die_type (die, cu);
15664 FIELD_NAME (*fp) = type_name_no_tag (fp->type);
15665 fip->nbaseclasses++;
15667 else if (die->tag == DW_TAG_variant_part)
15669 /* process_structure_scope will treat this DIE as a union. */
15670 process_structure_scope (die, cu);
15672 /* The variant part is relative to the start of the enclosing
15674 SET_FIELD_BITPOS (*fp, 0);
15675 fp->type = get_die_type (die, cu);
15676 fp->artificial = 1;
15677 fp->name = "<<variant>>";
15680 gdb_assert_not_reached ("missing case in dwarf2_add_field");
15683 /* Can the type given by DIE define another type? */
15686 type_can_define_types (const struct die_info *die)
15690 case DW_TAG_typedef:
15691 case DW_TAG_class_type:
15692 case DW_TAG_structure_type:
15693 case DW_TAG_union_type:
15694 case DW_TAG_enumeration_type:
15702 /* Add a type definition defined in the scope of the FIP's class. */
15705 dwarf2_add_type_defn (struct field_info *fip, struct die_info *die,
15706 struct dwarf2_cu *cu)
15708 struct decl_field_list *new_field;
15709 struct decl_field *fp;
15711 /* Allocate a new field list entry and link it in. */
15712 new_field = XCNEW (struct decl_field_list);
15713 make_cleanup (xfree, new_field);
15715 gdb_assert (type_can_define_types (die));
15717 fp = &new_field->field;
15719 /* Get name of field. NULL is okay here, meaning an anonymous type. */
15720 fp->name = dwarf2_name (die, cu);
15721 fp->type = read_type_die (die, cu);
15723 /* Save accessibility. */
15724 enum dwarf_access_attribute accessibility;
15725 struct attribute *attr = dwarf2_attr (die, DW_AT_accessibility, cu);
15727 accessibility = (enum dwarf_access_attribute) DW_UNSND (attr);
15729 accessibility = dwarf2_default_access_attribute (die, cu);
15730 switch (accessibility)
15732 case DW_ACCESS_public:
15733 /* The assumed value if neither private nor protected. */
15735 case DW_ACCESS_private:
15736 fp->is_private = 1;
15738 case DW_ACCESS_protected:
15739 fp->is_protected = 1;
15742 complaint (&symfile_complaints,
15743 _("Unhandled DW_AT_accessibility value (%x)"), accessibility);
15746 if (die->tag == DW_TAG_typedef)
15748 new_field->next = fip->typedef_field_list;
15749 fip->typedef_field_list = new_field;
15750 fip->typedef_field_list_count++;
15754 new_field->next = fip->nested_types_list;
15755 fip->nested_types_list = new_field;
15756 fip->nested_types_list_count++;
15760 /* Create the vector of fields, and attach it to the type. */
15763 dwarf2_attach_fields_to_type (struct field_info *fip, struct type *type,
15764 struct dwarf2_cu *cu)
15766 int nfields = fip->nfields;
15768 /* Record the field count, allocate space for the array of fields,
15769 and create blank accessibility bitfields if necessary. */
15770 TYPE_NFIELDS (type) = nfields;
15771 TYPE_FIELDS (type) = (struct field *)
15772 TYPE_ALLOC (type, sizeof (struct field) * nfields);
15773 memset (TYPE_FIELDS (type), 0, sizeof (struct field) * nfields);
15775 if (fip->non_public_fields && cu->language != language_ada)
15777 ALLOCATE_CPLUS_STRUCT_TYPE (type);
15779 TYPE_FIELD_PRIVATE_BITS (type) =
15780 (B_TYPE *) TYPE_ALLOC (type, B_BYTES (nfields));
15781 B_CLRALL (TYPE_FIELD_PRIVATE_BITS (type), nfields);
15783 TYPE_FIELD_PROTECTED_BITS (type) =
15784 (B_TYPE *) TYPE_ALLOC (type, B_BYTES (nfields));
15785 B_CLRALL (TYPE_FIELD_PROTECTED_BITS (type), nfields);
15787 TYPE_FIELD_IGNORE_BITS (type) =
15788 (B_TYPE *) TYPE_ALLOC (type, B_BYTES (nfields));
15789 B_CLRALL (TYPE_FIELD_IGNORE_BITS (type), nfields);
15792 /* If the type has baseclasses, allocate and clear a bit vector for
15793 TYPE_FIELD_VIRTUAL_BITS. */
15794 if (fip->nbaseclasses && cu->language != language_ada)
15796 int num_bytes = B_BYTES (fip->nbaseclasses);
15797 unsigned char *pointer;
15799 ALLOCATE_CPLUS_STRUCT_TYPE (type);
15800 pointer = (unsigned char *) TYPE_ALLOC (type, num_bytes);
15801 TYPE_FIELD_VIRTUAL_BITS (type) = pointer;
15802 B_CLRALL (TYPE_FIELD_VIRTUAL_BITS (type), fip->nbaseclasses);
15803 TYPE_N_BASECLASSES (type) = fip->nbaseclasses;
15806 if (TYPE_FLAG_DISCRIMINATED_UNION (type))
15808 struct discriminant_info *di = alloc_discriminant_info (type, -1, -1);
15810 int index = nfields - 1;
15811 struct nextfield *field = fip->fields;
15815 if (field->variant.is_discriminant)
15816 di->discriminant_index = index;
15817 else if (field->variant.default_branch)
15818 di->default_index = index;
15820 di->discriminants[index] = field->variant.discriminant_value;
15823 field = field->next;
15827 /* Copy the saved-up fields into the field vector. Start from the head of
15828 the list, adding to the tail of the field array, so that they end up in
15829 the same order in the array in which they were added to the list. */
15830 while (nfields-- > 0)
15832 struct nextfield *fieldp;
15836 fieldp = fip->fields;
15837 fip->fields = fieldp->next;
15841 fieldp = fip->baseclasses;
15842 fip->baseclasses = fieldp->next;
15845 TYPE_FIELD (type, nfields) = fieldp->field;
15846 switch (fieldp->accessibility)
15848 case DW_ACCESS_private:
15849 if (cu->language != language_ada)
15850 SET_TYPE_FIELD_PRIVATE (type, nfields);
15853 case DW_ACCESS_protected:
15854 if (cu->language != language_ada)
15855 SET_TYPE_FIELD_PROTECTED (type, nfields);
15858 case DW_ACCESS_public:
15862 /* Unknown accessibility. Complain and treat it as public. */
15864 complaint (&symfile_complaints, _("unsupported accessibility %d"),
15865 fieldp->accessibility);
15869 if (nfields < fip->nbaseclasses)
15871 switch (fieldp->virtuality)
15873 case DW_VIRTUALITY_virtual:
15874 case DW_VIRTUALITY_pure_virtual:
15875 if (cu->language == language_ada)
15876 error (_("unexpected virtuality in component of Ada type"));
15877 SET_TYPE_FIELD_VIRTUAL (type, nfields);
15884 /* Return true if this member function is a constructor, false
15888 dwarf2_is_constructor (struct die_info *die, struct dwarf2_cu *cu)
15890 const char *fieldname;
15891 const char *type_name;
15894 if (die->parent == NULL)
15897 if (die->parent->tag != DW_TAG_structure_type
15898 && die->parent->tag != DW_TAG_union_type
15899 && die->parent->tag != DW_TAG_class_type)
15902 fieldname = dwarf2_name (die, cu);
15903 type_name = dwarf2_name (die->parent, cu);
15904 if (fieldname == NULL || type_name == NULL)
15907 len = strlen (fieldname);
15908 return (strncmp (fieldname, type_name, len) == 0
15909 && (type_name[len] == '\0' || type_name[len] == '<'));
15912 /* Add a member function to the proper fieldlist. */
15915 dwarf2_add_member_fn (struct field_info *fip, struct die_info *die,
15916 struct type *type, struct dwarf2_cu *cu)
15918 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
15919 struct attribute *attr;
15920 struct fnfieldlist *flp;
15922 struct fn_field *fnp;
15923 const char *fieldname;
15924 struct nextfnfield *new_fnfield;
15925 struct type *this_type;
15926 enum dwarf_access_attribute accessibility;
15928 if (cu->language == language_ada)
15929 error (_("unexpected member function in Ada type"));
15931 /* Get name of member function. */
15932 fieldname = dwarf2_name (die, cu);
15933 if (fieldname == NULL)
15936 /* Look up member function name in fieldlist. */
15937 for (i = 0; i < fip->nfnfields; i++)
15939 if (strcmp (fip->fnfieldlists[i].name, fieldname) == 0)
15943 /* Create new list element if necessary. */
15944 if (i < fip->nfnfields)
15945 flp = &fip->fnfieldlists[i];
15948 if ((fip->nfnfields % DW_FIELD_ALLOC_CHUNK) == 0)
15950 fip->fnfieldlists = (struct fnfieldlist *)
15951 xrealloc (fip->fnfieldlists,
15952 (fip->nfnfields + DW_FIELD_ALLOC_CHUNK)
15953 * sizeof (struct fnfieldlist));
15954 if (fip->nfnfields == 0)
15955 make_cleanup (free_current_contents, &fip->fnfieldlists);
15957 flp = &fip->fnfieldlists[fip->nfnfields];
15958 flp->name = fieldname;
15961 i = fip->nfnfields++;
15964 /* Create a new member function field and chain it to the field list
15966 new_fnfield = XNEW (struct nextfnfield);
15967 make_cleanup (xfree, new_fnfield);
15968 memset (new_fnfield, 0, sizeof (struct nextfnfield));
15969 new_fnfield->next = flp->head;
15970 flp->head = new_fnfield;
15973 /* Fill in the member function field info. */
15974 fnp = &new_fnfield->fnfield;
15976 /* Delay processing of the physname until later. */
15977 if (cu->language == language_cplus)
15979 add_to_method_list (type, i, flp->length - 1, fieldname,
15984 const char *physname = dwarf2_physname (fieldname, die, cu);
15985 fnp->physname = physname ? physname : "";
15988 fnp->type = alloc_type (objfile);
15989 this_type = read_type_die (die, cu);
15990 if (this_type && TYPE_CODE (this_type) == TYPE_CODE_FUNC)
15992 int nparams = TYPE_NFIELDS (this_type);
15994 /* TYPE is the domain of this method, and THIS_TYPE is the type
15995 of the method itself (TYPE_CODE_METHOD). */
15996 smash_to_method_type (fnp->type, type,
15997 TYPE_TARGET_TYPE (this_type),
15998 TYPE_FIELDS (this_type),
15999 TYPE_NFIELDS (this_type),
16000 TYPE_VARARGS (this_type));
16002 /* Handle static member functions.
16003 Dwarf2 has no clean way to discern C++ static and non-static
16004 member functions. G++ helps GDB by marking the first
16005 parameter for non-static member functions (which is the this
16006 pointer) as artificial. We obtain this information from
16007 read_subroutine_type via TYPE_FIELD_ARTIFICIAL. */
16008 if (nparams == 0 || TYPE_FIELD_ARTIFICIAL (this_type, 0) == 0)
16009 fnp->voffset = VOFFSET_STATIC;
16012 complaint (&symfile_complaints, _("member function type missing for '%s'"),
16013 dwarf2_full_name (fieldname, die, cu));
16015 /* Get fcontext from DW_AT_containing_type if present. */
16016 if (dwarf2_attr (die, DW_AT_containing_type, cu) != NULL)
16017 fnp->fcontext = die_containing_type (die, cu);
16019 /* dwarf2 doesn't have stubbed physical names, so the setting of is_const and
16020 is_volatile is irrelevant, as it is needed by gdb_mangle_name only. */
16022 /* Get accessibility. */
16023 attr = dwarf2_attr (die, DW_AT_accessibility, cu);
16025 accessibility = (enum dwarf_access_attribute) DW_UNSND (attr);
16027 accessibility = dwarf2_default_access_attribute (die, cu);
16028 switch (accessibility)
16030 case DW_ACCESS_private:
16031 fnp->is_private = 1;
16033 case DW_ACCESS_protected:
16034 fnp->is_protected = 1;
16038 /* Check for artificial methods. */
16039 attr = dwarf2_attr (die, DW_AT_artificial, cu);
16040 if (attr && DW_UNSND (attr) != 0)
16041 fnp->is_artificial = 1;
16043 fnp->is_constructor = dwarf2_is_constructor (die, cu);
16045 /* Get index in virtual function table if it is a virtual member
16046 function. For older versions of GCC, this is an offset in the
16047 appropriate virtual table, as specified by DW_AT_containing_type.
16048 For everyone else, it is an expression to be evaluated relative
16049 to the object address. */
16051 attr = dwarf2_attr (die, DW_AT_vtable_elem_location, cu);
16054 if (attr_form_is_block (attr) && DW_BLOCK (attr)->size > 0)
16056 if (DW_BLOCK (attr)->data[0] == DW_OP_constu)
16058 /* Old-style GCC. */
16059 fnp->voffset = decode_locdesc (DW_BLOCK (attr), cu) + 2;
16061 else if (DW_BLOCK (attr)->data[0] == DW_OP_deref
16062 || (DW_BLOCK (attr)->size > 1
16063 && DW_BLOCK (attr)->data[0] == DW_OP_deref_size
16064 && DW_BLOCK (attr)->data[1] == cu->header.addr_size))
16066 fnp->voffset = decode_locdesc (DW_BLOCK (attr), cu);
16067 if ((fnp->voffset % cu->header.addr_size) != 0)
16068 dwarf2_complex_location_expr_complaint ();
16070 fnp->voffset /= cu->header.addr_size;
16074 dwarf2_complex_location_expr_complaint ();
16076 if (!fnp->fcontext)
16078 /* If there is no `this' field and no DW_AT_containing_type,
16079 we cannot actually find a base class context for the
16081 if (TYPE_NFIELDS (this_type) == 0
16082 || !TYPE_FIELD_ARTIFICIAL (this_type, 0))
16084 complaint (&symfile_complaints,
16085 _("cannot determine context for virtual member "
16086 "function \"%s\" (offset %s)"),
16087 fieldname, sect_offset_str (die->sect_off));
16092 = TYPE_TARGET_TYPE (TYPE_FIELD_TYPE (this_type, 0));
16096 else if (attr_form_is_section_offset (attr))
16098 dwarf2_complex_location_expr_complaint ();
16102 dwarf2_invalid_attrib_class_complaint ("DW_AT_vtable_elem_location",
16108 attr = dwarf2_attr (die, DW_AT_virtuality, cu);
16109 if (attr && DW_UNSND (attr))
16111 /* GCC does this, as of 2008-08-25; PR debug/37237. */
16112 complaint (&symfile_complaints,
16113 _("Member function \"%s\" (offset %s) is virtual "
16114 "but the vtable offset is not specified"),
16115 fieldname, sect_offset_str (die->sect_off));
16116 ALLOCATE_CPLUS_STRUCT_TYPE (type);
16117 TYPE_CPLUS_DYNAMIC (type) = 1;
16122 /* Create the vector of member function fields, and attach it to the type. */
16125 dwarf2_attach_fn_fields_to_type (struct field_info *fip, struct type *type,
16126 struct dwarf2_cu *cu)
16128 struct fnfieldlist *flp;
16131 if (cu->language == language_ada)
16132 error (_("unexpected member functions in Ada type"));
16134 ALLOCATE_CPLUS_STRUCT_TYPE (type);
16135 TYPE_FN_FIELDLISTS (type) = (struct fn_fieldlist *)
16136 TYPE_ALLOC (type, sizeof (struct fn_fieldlist) * fip->nfnfields);
16138 for (i = 0, flp = fip->fnfieldlists; i < fip->nfnfields; i++, flp++)
16140 struct nextfnfield *nfp = flp->head;
16141 struct fn_fieldlist *fn_flp = &TYPE_FN_FIELDLIST (type, i);
16144 TYPE_FN_FIELDLIST_NAME (type, i) = flp->name;
16145 TYPE_FN_FIELDLIST_LENGTH (type, i) = flp->length;
16146 fn_flp->fn_fields = (struct fn_field *)
16147 TYPE_ALLOC (type, sizeof (struct fn_field) * flp->length);
16148 for (k = flp->length; (k--, nfp); nfp = nfp->next)
16149 fn_flp->fn_fields[k] = nfp->fnfield;
16152 TYPE_NFN_FIELDS (type) = fip->nfnfields;
16155 /* Returns non-zero if NAME is the name of a vtable member in CU's
16156 language, zero otherwise. */
16158 is_vtable_name (const char *name, struct dwarf2_cu *cu)
16160 static const char vptr[] = "_vptr";
16162 /* Look for the C++ form of the vtable. */
16163 if (startswith (name, vptr) && is_cplus_marker (name[sizeof (vptr) - 1]))
16169 /* GCC outputs unnamed structures that are really pointers to member
16170 functions, with the ABI-specified layout. If TYPE describes
16171 such a structure, smash it into a member function type.
16173 GCC shouldn't do this; it should just output pointer to member DIEs.
16174 This is GCC PR debug/28767. */
16177 quirk_gcc_member_function_pointer (struct type *type, struct objfile *objfile)
16179 struct type *pfn_type, *self_type, *new_type;
16181 /* Check for a structure with no name and two children. */
16182 if (TYPE_CODE (type) != TYPE_CODE_STRUCT || TYPE_NFIELDS (type) != 2)
16185 /* Check for __pfn and __delta members. */
16186 if (TYPE_FIELD_NAME (type, 0) == NULL
16187 || strcmp (TYPE_FIELD_NAME (type, 0), "__pfn") != 0
16188 || TYPE_FIELD_NAME (type, 1) == NULL
16189 || strcmp (TYPE_FIELD_NAME (type, 1), "__delta") != 0)
16192 /* Find the type of the method. */
16193 pfn_type = TYPE_FIELD_TYPE (type, 0);
16194 if (pfn_type == NULL
16195 || TYPE_CODE (pfn_type) != TYPE_CODE_PTR
16196 || TYPE_CODE (TYPE_TARGET_TYPE (pfn_type)) != TYPE_CODE_FUNC)
16199 /* Look for the "this" argument. */
16200 pfn_type = TYPE_TARGET_TYPE (pfn_type);
16201 if (TYPE_NFIELDS (pfn_type) == 0
16202 /* || TYPE_FIELD_TYPE (pfn_type, 0) == NULL */
16203 || TYPE_CODE (TYPE_FIELD_TYPE (pfn_type, 0)) != TYPE_CODE_PTR)
16206 self_type = TYPE_TARGET_TYPE (TYPE_FIELD_TYPE (pfn_type, 0));
16207 new_type = alloc_type (objfile);
16208 smash_to_method_type (new_type, self_type, TYPE_TARGET_TYPE (pfn_type),
16209 TYPE_FIELDS (pfn_type), TYPE_NFIELDS (pfn_type),
16210 TYPE_VARARGS (pfn_type));
16211 smash_to_methodptr_type (type, new_type);
16215 /* Called when we find the DIE that starts a structure or union scope
16216 (definition) to create a type for the structure or union. Fill in
16217 the type's name and general properties; the members will not be
16218 processed until process_structure_scope. A symbol table entry for
16219 the type will also not be done until process_structure_scope (assuming
16220 the type has a name).
16222 NOTE: we need to call these functions regardless of whether or not the
16223 DIE has a DW_AT_name attribute, since it might be an anonymous
16224 structure or union. This gets the type entered into our set of
16225 user defined types. */
16227 static struct type *
16228 read_structure_type (struct die_info *die, struct dwarf2_cu *cu)
16230 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
16232 struct attribute *attr;
16235 /* If the definition of this type lives in .debug_types, read that type.
16236 Don't follow DW_AT_specification though, that will take us back up
16237 the chain and we want to go down. */
16238 attr = dwarf2_attr_no_follow (die, DW_AT_signature);
16241 type = get_DW_AT_signature_type (die, attr, cu);
16243 /* The type's CU may not be the same as CU.
16244 Ensure TYPE is recorded with CU in die_type_hash. */
16245 return set_die_type (die, type, cu);
16248 type = alloc_type (objfile);
16249 INIT_CPLUS_SPECIFIC (type);
16251 name = dwarf2_name (die, cu);
16254 if (cu->language == language_cplus
16255 || cu->language == language_d
16256 || cu->language == language_rust)
16258 const char *full_name = dwarf2_full_name (name, die, cu);
16260 /* dwarf2_full_name might have already finished building the DIE's
16261 type. If so, there is no need to continue. */
16262 if (get_die_type (die, cu) != NULL)
16263 return get_die_type (die, cu);
16265 TYPE_TAG_NAME (type) = full_name;
16266 if (die->tag == DW_TAG_structure_type
16267 || die->tag == DW_TAG_class_type)
16268 TYPE_NAME (type) = TYPE_TAG_NAME (type);
16272 /* The name is already allocated along with this objfile, so
16273 we don't need to duplicate it for the type. */
16274 TYPE_TAG_NAME (type) = name;
16275 if (die->tag == DW_TAG_class_type)
16276 TYPE_NAME (type) = TYPE_TAG_NAME (type);
16280 if (die->tag == DW_TAG_structure_type)
16282 TYPE_CODE (type) = TYPE_CODE_STRUCT;
16284 else if (die->tag == DW_TAG_union_type)
16286 TYPE_CODE (type) = TYPE_CODE_UNION;
16288 else if (die->tag == DW_TAG_variant_part)
16290 TYPE_CODE (type) = TYPE_CODE_UNION;
16291 TYPE_FLAG_DISCRIMINATED_UNION (type) = 1;
16295 TYPE_CODE (type) = TYPE_CODE_STRUCT;
16298 if (cu->language == language_cplus && die->tag == DW_TAG_class_type)
16299 TYPE_DECLARED_CLASS (type) = 1;
16301 attr = dwarf2_attr (die, DW_AT_byte_size, cu);
16304 if (attr_form_is_constant (attr))
16305 TYPE_LENGTH (type) = DW_UNSND (attr);
16308 /* For the moment, dynamic type sizes are not supported
16309 by GDB's struct type. The actual size is determined
16310 on-demand when resolving the type of a given object,
16311 so set the type's length to zero for now. Otherwise,
16312 we record an expression as the length, and that expression
16313 could lead to a very large value, which could eventually
16314 lead to us trying to allocate that much memory when creating
16315 a value of that type. */
16316 TYPE_LENGTH (type) = 0;
16321 TYPE_LENGTH (type) = 0;
16324 if (producer_is_icc_lt_14 (cu) && (TYPE_LENGTH (type) == 0))
16326 /* ICC<14 does not output the required DW_AT_declaration on
16327 incomplete types, but gives them a size of zero. */
16328 TYPE_STUB (type) = 1;
16331 TYPE_STUB_SUPPORTED (type) = 1;
16333 if (die_is_declaration (die, cu))
16334 TYPE_STUB (type) = 1;
16335 else if (attr == NULL && die->child == NULL
16336 && producer_is_realview (cu->producer))
16337 /* RealView does not output the required DW_AT_declaration
16338 on incomplete types. */
16339 TYPE_STUB (type) = 1;
16341 /* We need to add the type field to the die immediately so we don't
16342 infinitely recurse when dealing with pointers to the structure
16343 type within the structure itself. */
16344 set_die_type (die, type, cu);
16346 /* set_die_type should be already done. */
16347 set_descriptive_type (type, die, cu);
16352 /* A helper for process_structure_scope that handles a single member
16356 handle_struct_member_die (struct die_info *child_die, struct type *type,
16357 struct field_info *fi,
16358 std::vector<struct symbol *> *template_args,
16359 struct dwarf2_cu *cu)
16361 if (child_die->tag == DW_TAG_member
16362 || child_die->tag == DW_TAG_variable
16363 || child_die->tag == DW_TAG_variant_part)
16365 /* NOTE: carlton/2002-11-05: A C++ static data member
16366 should be a DW_TAG_member that is a declaration, but
16367 all versions of G++ as of this writing (so through at
16368 least 3.2.1) incorrectly generate DW_TAG_variable
16369 tags for them instead. */
16370 dwarf2_add_field (fi, child_die, cu);
16372 else if (child_die->tag == DW_TAG_subprogram)
16374 /* Rust doesn't have member functions in the C++ sense.
16375 However, it does emit ordinary functions as children
16376 of a struct DIE. */
16377 if (cu->language == language_rust)
16378 read_func_scope (child_die, cu);
16381 /* C++ member function. */
16382 dwarf2_add_member_fn (fi, child_die, type, cu);
16385 else if (child_die->tag == DW_TAG_inheritance)
16387 /* C++ base class field. */
16388 dwarf2_add_field (fi, child_die, cu);
16390 else if (type_can_define_types (child_die))
16391 dwarf2_add_type_defn (fi, child_die, cu);
16392 else if (child_die->tag == DW_TAG_template_type_param
16393 || child_die->tag == DW_TAG_template_value_param)
16395 struct symbol *arg = new_symbol (child_die, NULL, cu);
16398 template_args->push_back (arg);
16400 else if (child_die->tag == DW_TAG_variant)
16402 /* In a variant we want to get the discriminant and also add a
16403 field for our sole member child. */
16404 struct attribute *discr = dwarf2_attr (child_die, DW_AT_discr_value, cu);
16406 for (struct die_info *variant_child = child_die->child;
16407 variant_child != NULL;
16408 variant_child = sibling_die (variant_child))
16410 if (variant_child->tag == DW_TAG_member)
16412 handle_struct_member_die (variant_child, type, fi,
16413 template_args, cu);
16414 /* Only handle the one. */
16419 /* We don't handle this but we might as well report it if we see
16421 if (dwarf2_attr (child_die, DW_AT_discr_list, cu) != nullptr)
16422 complaint (&symfile_complaints,
16423 _("DW_AT_discr_list is not supported yet"
16424 " - DIE at %s [in module %s]"),
16425 sect_offset_str (child_die->sect_off),
16426 objfile_name (cu->per_cu->dwarf2_per_objfile->objfile));
16428 /* The first field was just added, so we can stash the
16429 discriminant there. */
16430 gdb_assert (fi->fields != NULL);
16432 fi->fields->variant.default_branch = true;
16434 fi->fields->variant.discriminant_value = DW_UNSND (discr);
16438 /* Finish creating a structure or union type, including filling in
16439 its members and creating a symbol for it. */
16442 process_structure_scope (struct die_info *die, struct dwarf2_cu *cu)
16444 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
16445 struct die_info *child_die;
16448 type = get_die_type (die, cu);
16450 type = read_structure_type (die, cu);
16452 /* When reading a DW_TAG_variant_part, we need to notice when we
16453 read the discriminant member, so we can record it later in the
16454 discriminant_info. */
16455 bool is_variant_part = TYPE_FLAG_DISCRIMINATED_UNION (type);
16456 sect_offset discr_offset;
16458 if (is_variant_part)
16460 struct attribute *discr = dwarf2_attr (die, DW_AT_discr, cu);
16463 /* Maybe it's a univariant form, an extension we support.
16464 In this case arrange not to check the offset. */
16465 is_variant_part = false;
16467 else if (attr_form_is_ref (discr))
16469 struct dwarf2_cu *target_cu = cu;
16470 struct die_info *target_die = follow_die_ref (die, discr, &target_cu);
16472 discr_offset = target_die->sect_off;
16476 complaint (&symfile_complaints,
16477 _("DW_AT_discr does not have DIE reference form"
16478 " - DIE at %s [in module %s]"),
16479 sect_offset_str (die->sect_off),
16480 objfile_name (cu->per_cu->dwarf2_per_objfile->objfile));
16481 is_variant_part = false;
16485 if (die->child != NULL && ! die_is_declaration (die, cu))
16487 struct field_info fi;
16488 std::vector<struct symbol *> template_args;
16489 struct cleanup *back_to = make_cleanup (null_cleanup, 0);
16491 memset (&fi, 0, sizeof (struct field_info));
16493 child_die = die->child;
16495 while (child_die && child_die->tag)
16497 handle_struct_member_die (child_die, type, &fi, &template_args, cu);
16499 if (is_variant_part && discr_offset == child_die->sect_off)
16500 fi.fields->variant.is_discriminant = true;
16502 child_die = sibling_die (child_die);
16505 /* Attach template arguments to type. */
16506 if (!template_args.empty ())
16508 ALLOCATE_CPLUS_STRUCT_TYPE (type);
16509 TYPE_N_TEMPLATE_ARGUMENTS (type) = template_args.size ();
16510 TYPE_TEMPLATE_ARGUMENTS (type)
16511 = XOBNEWVEC (&objfile->objfile_obstack,
16513 TYPE_N_TEMPLATE_ARGUMENTS (type));
16514 memcpy (TYPE_TEMPLATE_ARGUMENTS (type),
16515 template_args.data (),
16516 (TYPE_N_TEMPLATE_ARGUMENTS (type)
16517 * sizeof (struct symbol *)));
16520 /* Attach fields and member functions to the type. */
16522 dwarf2_attach_fields_to_type (&fi, type, cu);
16525 dwarf2_attach_fn_fields_to_type (&fi, type, cu);
16527 /* Get the type which refers to the base class (possibly this
16528 class itself) which contains the vtable pointer for the current
16529 class from the DW_AT_containing_type attribute. This use of
16530 DW_AT_containing_type is a GNU extension. */
16532 if (dwarf2_attr (die, DW_AT_containing_type, cu) != NULL)
16534 struct type *t = die_containing_type (die, cu);
16536 set_type_vptr_basetype (type, t);
16541 /* Our own class provides vtbl ptr. */
16542 for (i = TYPE_NFIELDS (t) - 1;
16543 i >= TYPE_N_BASECLASSES (t);
16546 const char *fieldname = TYPE_FIELD_NAME (t, i);
16548 if (is_vtable_name (fieldname, cu))
16550 set_type_vptr_fieldno (type, i);
16555 /* Complain if virtual function table field not found. */
16556 if (i < TYPE_N_BASECLASSES (t))
16557 complaint (&symfile_complaints,
16558 _("virtual function table pointer "
16559 "not found when defining class '%s'"),
16560 TYPE_TAG_NAME (type) ? TYPE_TAG_NAME (type) :
16565 set_type_vptr_fieldno (type, TYPE_VPTR_FIELDNO (t));
16568 else if (cu->producer
16569 && startswith (cu->producer, "IBM(R) XL C/C++ Advanced Edition"))
16571 /* The IBM XLC compiler does not provide direct indication
16572 of the containing type, but the vtable pointer is
16573 always named __vfp. */
16577 for (i = TYPE_NFIELDS (type) - 1;
16578 i >= TYPE_N_BASECLASSES (type);
16581 if (strcmp (TYPE_FIELD_NAME (type, i), "__vfp") == 0)
16583 set_type_vptr_fieldno (type, i);
16584 set_type_vptr_basetype (type, type);
16591 /* Copy fi.typedef_field_list linked list elements content into the
16592 allocated array TYPE_TYPEDEF_FIELD_ARRAY (type). */
16593 if (fi.typedef_field_list)
16595 int i = fi.typedef_field_list_count;
16597 ALLOCATE_CPLUS_STRUCT_TYPE (type);
16598 TYPE_TYPEDEF_FIELD_ARRAY (type)
16599 = ((struct decl_field *)
16600 TYPE_ALLOC (type, sizeof (TYPE_TYPEDEF_FIELD (type, 0)) * i));
16601 TYPE_TYPEDEF_FIELD_COUNT (type) = i;
16603 /* Reverse the list order to keep the debug info elements order. */
16606 struct decl_field *dest, *src;
16608 dest = &TYPE_TYPEDEF_FIELD (type, i);
16609 src = &fi.typedef_field_list->field;
16610 fi.typedef_field_list = fi.typedef_field_list->next;
16615 /* Copy fi.nested_types_list linked list elements content into the
16616 allocated array TYPE_NESTED_TYPES_ARRAY (type). */
16617 if (fi.nested_types_list != NULL && cu->language != language_ada)
16619 int i = fi.nested_types_list_count;
16621 ALLOCATE_CPLUS_STRUCT_TYPE (type);
16622 TYPE_NESTED_TYPES_ARRAY (type)
16623 = ((struct decl_field *)
16624 TYPE_ALLOC (type, sizeof (struct decl_field) * i));
16625 TYPE_NESTED_TYPES_COUNT (type) = i;
16627 /* Reverse the list order to keep the debug info elements order. */
16630 struct decl_field *dest, *src;
16632 dest = &TYPE_NESTED_TYPES_FIELD (type, i);
16633 src = &fi.nested_types_list->field;
16634 fi.nested_types_list = fi.nested_types_list->next;
16639 do_cleanups (back_to);
16642 quirk_gcc_member_function_pointer (type, objfile);
16643 if (cu->language == language_rust && die->tag == DW_TAG_union_type)
16644 cu->rust_unions.push_back (type);
16646 /* NOTE: carlton/2004-03-16: GCC 3.4 (or at least one of its
16647 snapshots) has been known to create a die giving a declaration
16648 for a class that has, as a child, a die giving a definition for a
16649 nested class. So we have to process our children even if the
16650 current die is a declaration. Normally, of course, a declaration
16651 won't have any children at all. */
16653 child_die = die->child;
16655 while (child_die != NULL && child_die->tag)
16657 if (child_die->tag == DW_TAG_member
16658 || child_die->tag == DW_TAG_variable
16659 || child_die->tag == DW_TAG_inheritance
16660 || child_die->tag == DW_TAG_template_value_param
16661 || child_die->tag == DW_TAG_template_type_param)
16666 process_die (child_die, cu);
16668 child_die = sibling_die (child_die);
16671 /* Do not consider external references. According to the DWARF standard,
16672 these DIEs are identified by the fact that they have no byte_size
16673 attribute, and a declaration attribute. */
16674 if (dwarf2_attr (die, DW_AT_byte_size, cu) != NULL
16675 || !die_is_declaration (die, cu))
16676 new_symbol (die, type, cu);
16679 /* Assuming DIE is an enumeration type, and TYPE is its associated type,
16680 update TYPE using some information only available in DIE's children. */
16683 update_enumeration_type_from_children (struct die_info *die,
16685 struct dwarf2_cu *cu)
16687 struct die_info *child_die;
16688 int unsigned_enum = 1;
16692 auto_obstack obstack;
16694 for (child_die = die->child;
16695 child_die != NULL && child_die->tag;
16696 child_die = sibling_die (child_die))
16698 struct attribute *attr;
16700 const gdb_byte *bytes;
16701 struct dwarf2_locexpr_baton *baton;
16704 if (child_die->tag != DW_TAG_enumerator)
16707 attr = dwarf2_attr (child_die, DW_AT_const_value, cu);
16711 name = dwarf2_name (child_die, cu);
16713 name = "<anonymous enumerator>";
16715 dwarf2_const_value_attr (attr, type, name, &obstack, cu,
16716 &value, &bytes, &baton);
16722 else if ((mask & value) != 0)
16727 /* If we already know that the enum type is neither unsigned, nor
16728 a flag type, no need to look at the rest of the enumerates. */
16729 if (!unsigned_enum && !flag_enum)
16734 TYPE_UNSIGNED (type) = 1;
16736 TYPE_FLAG_ENUM (type) = 1;
16739 /* Given a DW_AT_enumeration_type die, set its type. We do not
16740 complete the type's fields yet, or create any symbols. */
16742 static struct type *
16743 read_enumeration_type (struct die_info *die, struct dwarf2_cu *cu)
16745 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
16747 struct attribute *attr;
16750 /* If the definition of this type lives in .debug_types, read that type.
16751 Don't follow DW_AT_specification though, that will take us back up
16752 the chain and we want to go down. */
16753 attr = dwarf2_attr_no_follow (die, DW_AT_signature);
16756 type = get_DW_AT_signature_type (die, attr, cu);
16758 /* The type's CU may not be the same as CU.
16759 Ensure TYPE is recorded with CU in die_type_hash. */
16760 return set_die_type (die, type, cu);
16763 type = alloc_type (objfile);
16765 TYPE_CODE (type) = TYPE_CODE_ENUM;
16766 name = dwarf2_full_name (NULL, die, cu);
16768 TYPE_TAG_NAME (type) = name;
16770 attr = dwarf2_attr (die, DW_AT_type, cu);
16773 struct type *underlying_type = die_type (die, cu);
16775 TYPE_TARGET_TYPE (type) = underlying_type;
16778 attr = dwarf2_attr (die, DW_AT_byte_size, cu);
16781 TYPE_LENGTH (type) = DW_UNSND (attr);
16785 TYPE_LENGTH (type) = 0;
16788 /* The enumeration DIE can be incomplete. In Ada, any type can be
16789 declared as private in the package spec, and then defined only
16790 inside the package body. Such types are known as Taft Amendment
16791 Types. When another package uses such a type, an incomplete DIE
16792 may be generated by the compiler. */
16793 if (die_is_declaration (die, cu))
16794 TYPE_STUB (type) = 1;
16796 /* Finish the creation of this type by using the enum's children.
16797 We must call this even when the underlying type has been provided
16798 so that we can determine if we're looking at a "flag" enum. */
16799 update_enumeration_type_from_children (die, type, cu);
16801 /* If this type has an underlying type that is not a stub, then we
16802 may use its attributes. We always use the "unsigned" attribute
16803 in this situation, because ordinarily we guess whether the type
16804 is unsigned -- but the guess can be wrong and the underlying type
16805 can tell us the reality. However, we defer to a local size
16806 attribute if one exists, because this lets the compiler override
16807 the underlying type if needed. */
16808 if (TYPE_TARGET_TYPE (type) != NULL && !TYPE_STUB (TYPE_TARGET_TYPE (type)))
16810 TYPE_UNSIGNED (type) = TYPE_UNSIGNED (TYPE_TARGET_TYPE (type));
16811 if (TYPE_LENGTH (type) == 0)
16812 TYPE_LENGTH (type) = TYPE_LENGTH (TYPE_TARGET_TYPE (type));
16815 TYPE_DECLARED_CLASS (type) = dwarf2_flag_true_p (die, DW_AT_enum_class, cu);
16817 return set_die_type (die, type, cu);
16820 /* Given a pointer to a die which begins an enumeration, process all
16821 the dies that define the members of the enumeration, and create the
16822 symbol for the enumeration type.
16824 NOTE: We reverse the order of the element list. */
16827 process_enumeration_scope (struct die_info *die, struct dwarf2_cu *cu)
16829 struct type *this_type;
16831 this_type = get_die_type (die, cu);
16832 if (this_type == NULL)
16833 this_type = read_enumeration_type (die, cu);
16835 if (die->child != NULL)
16837 struct die_info *child_die;
16838 struct symbol *sym;
16839 struct field *fields = NULL;
16840 int num_fields = 0;
16843 child_die = die->child;
16844 while (child_die && child_die->tag)
16846 if (child_die->tag != DW_TAG_enumerator)
16848 process_die (child_die, cu);
16852 name = dwarf2_name (child_die, cu);
16855 sym = new_symbol (child_die, this_type, cu);
16857 if ((num_fields % DW_FIELD_ALLOC_CHUNK) == 0)
16859 fields = (struct field *)
16861 (num_fields + DW_FIELD_ALLOC_CHUNK)
16862 * sizeof (struct field));
16865 FIELD_NAME (fields[num_fields]) = SYMBOL_LINKAGE_NAME (sym);
16866 FIELD_TYPE (fields[num_fields]) = NULL;
16867 SET_FIELD_ENUMVAL (fields[num_fields], SYMBOL_VALUE (sym));
16868 FIELD_BITSIZE (fields[num_fields]) = 0;
16874 child_die = sibling_die (child_die);
16879 TYPE_NFIELDS (this_type) = num_fields;
16880 TYPE_FIELDS (this_type) = (struct field *)
16881 TYPE_ALLOC (this_type, sizeof (struct field) * num_fields);
16882 memcpy (TYPE_FIELDS (this_type), fields,
16883 sizeof (struct field) * num_fields);
16888 /* If we are reading an enum from a .debug_types unit, and the enum
16889 is a declaration, and the enum is not the signatured type in the
16890 unit, then we do not want to add a symbol for it. Adding a
16891 symbol would in some cases obscure the true definition of the
16892 enum, giving users an incomplete type when the definition is
16893 actually available. Note that we do not want to do this for all
16894 enums which are just declarations, because C++0x allows forward
16895 enum declarations. */
16896 if (cu->per_cu->is_debug_types
16897 && die_is_declaration (die, cu))
16899 struct signatured_type *sig_type;
16901 sig_type = (struct signatured_type *) cu->per_cu;
16902 gdb_assert (to_underlying (sig_type->type_offset_in_section) != 0);
16903 if (sig_type->type_offset_in_section != die->sect_off)
16907 new_symbol (die, this_type, cu);
16910 /* Extract all information from a DW_TAG_array_type DIE and put it in
16911 the DIE's type field. For now, this only handles one dimensional
16914 static struct type *
16915 read_array_type (struct die_info *die, struct dwarf2_cu *cu)
16917 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
16918 struct die_info *child_die;
16920 struct type *element_type, *range_type, *index_type;
16921 struct attribute *attr;
16923 struct dynamic_prop *byte_stride_prop = NULL;
16924 unsigned int bit_stride = 0;
16926 element_type = die_type (die, cu);
16928 /* The die_type call above may have already set the type for this DIE. */
16929 type = get_die_type (die, cu);
16933 attr = dwarf2_attr (die, DW_AT_byte_stride, cu);
16939 = (struct dynamic_prop *) alloca (sizeof (struct dynamic_prop));
16940 stride_ok = attr_to_dynamic_prop (attr, die, cu, byte_stride_prop);
16943 complaint (&symfile_complaints,
16944 _("unable to read array DW_AT_byte_stride "
16945 " - DIE at %s [in module %s]"),
16946 sect_offset_str (die->sect_off),
16947 objfile_name (cu->per_cu->dwarf2_per_objfile->objfile));
16948 /* Ignore this attribute. We will likely not be able to print
16949 arrays of this type correctly, but there is little we can do
16950 to help if we cannot read the attribute's value. */
16951 byte_stride_prop = NULL;
16955 attr = dwarf2_attr (die, DW_AT_bit_stride, cu);
16957 bit_stride = DW_UNSND (attr);
16959 /* Irix 6.2 native cc creates array types without children for
16960 arrays with unspecified length. */
16961 if (die->child == NULL)
16963 index_type = objfile_type (objfile)->builtin_int;
16964 range_type = create_static_range_type (NULL, index_type, 0, -1);
16965 type = create_array_type_with_stride (NULL, element_type, range_type,
16966 byte_stride_prop, bit_stride);
16967 return set_die_type (die, type, cu);
16970 std::vector<struct type *> range_types;
16971 child_die = die->child;
16972 while (child_die && child_die->tag)
16974 if (child_die->tag == DW_TAG_subrange_type)
16976 struct type *child_type = read_type_die (child_die, cu);
16978 if (child_type != NULL)
16980 /* The range type was succesfully read. Save it for the
16981 array type creation. */
16982 range_types.push_back (child_type);
16985 child_die = sibling_die (child_die);
16988 /* Dwarf2 dimensions are output from left to right, create the
16989 necessary array types in backwards order. */
16991 type = element_type;
16993 if (read_array_order (die, cu) == DW_ORD_col_major)
16997 while (i < range_types.size ())
16998 type = create_array_type_with_stride (NULL, type, range_types[i++],
16999 byte_stride_prop, bit_stride);
17003 size_t ndim = range_types.size ();
17005 type = create_array_type_with_stride (NULL, type, range_types[ndim],
17006 byte_stride_prop, bit_stride);
17009 /* Understand Dwarf2 support for vector types (like they occur on
17010 the PowerPC w/ AltiVec). Gcc just adds another attribute to the
17011 array type. This is not part of the Dwarf2/3 standard yet, but a
17012 custom vendor extension. The main difference between a regular
17013 array and the vector variant is that vectors are passed by value
17015 attr = dwarf2_attr (die, DW_AT_GNU_vector, cu);
17017 make_vector_type (type);
17019 /* The DIE may have DW_AT_byte_size set. For example an OpenCL
17020 implementation may choose to implement triple vectors using this
17022 attr = dwarf2_attr (die, DW_AT_byte_size, cu);
17025 if (DW_UNSND (attr) >= TYPE_LENGTH (type))
17026 TYPE_LENGTH (type) = DW_UNSND (attr);
17028 complaint (&symfile_complaints,
17029 _("DW_AT_byte_size for array type smaller "
17030 "than the total size of elements"));
17033 name = dwarf2_name (die, cu);
17035 TYPE_NAME (type) = name;
17037 /* Install the type in the die. */
17038 set_die_type (die, type, cu);
17040 /* set_die_type should be already done. */
17041 set_descriptive_type (type, die, cu);
17046 static enum dwarf_array_dim_ordering
17047 read_array_order (struct die_info *die, struct dwarf2_cu *cu)
17049 struct attribute *attr;
17051 attr = dwarf2_attr (die, DW_AT_ordering, cu);
17054 return (enum dwarf_array_dim_ordering) DW_SND (attr);
17056 /* GNU F77 is a special case, as at 08/2004 array type info is the
17057 opposite order to the dwarf2 specification, but data is still
17058 laid out as per normal fortran.
17060 FIXME: dsl/2004-8-20: If G77 is ever fixed, this will also need
17061 version checking. */
17063 if (cu->language == language_fortran
17064 && cu->producer && strstr (cu->producer, "GNU F77"))
17066 return DW_ORD_row_major;
17069 switch (cu->language_defn->la_array_ordering)
17071 case array_column_major:
17072 return DW_ORD_col_major;
17073 case array_row_major:
17075 return DW_ORD_row_major;
17079 /* Extract all information from a DW_TAG_set_type DIE and put it in
17080 the DIE's type field. */
17082 static struct type *
17083 read_set_type (struct die_info *die, struct dwarf2_cu *cu)
17085 struct type *domain_type, *set_type;
17086 struct attribute *attr;
17088 domain_type = die_type (die, cu);
17090 /* The die_type call above may have already set the type for this DIE. */
17091 set_type = get_die_type (die, cu);
17095 set_type = create_set_type (NULL, domain_type);
17097 attr = dwarf2_attr (die, DW_AT_byte_size, cu);
17099 TYPE_LENGTH (set_type) = DW_UNSND (attr);
17101 return set_die_type (die, set_type, cu);
17104 /* A helper for read_common_block that creates a locexpr baton.
17105 SYM is the symbol which we are marking as computed.
17106 COMMON_DIE is the DIE for the common block.
17107 COMMON_LOC is the location expression attribute for the common
17109 MEMBER_LOC is the location expression attribute for the particular
17110 member of the common block that we are processing.
17111 CU is the CU from which the above come. */
17114 mark_common_block_symbol_computed (struct symbol *sym,
17115 struct die_info *common_die,
17116 struct attribute *common_loc,
17117 struct attribute *member_loc,
17118 struct dwarf2_cu *cu)
17120 struct dwarf2_per_objfile *dwarf2_per_objfile
17121 = cu->per_cu->dwarf2_per_objfile;
17122 struct objfile *objfile = dwarf2_per_objfile->objfile;
17123 struct dwarf2_locexpr_baton *baton;
17125 unsigned int cu_off;
17126 enum bfd_endian byte_order = gdbarch_byte_order (get_objfile_arch (objfile));
17127 LONGEST offset = 0;
17129 gdb_assert (common_loc && member_loc);
17130 gdb_assert (attr_form_is_block (common_loc));
17131 gdb_assert (attr_form_is_block (member_loc)
17132 || attr_form_is_constant (member_loc));
17134 baton = XOBNEW (&objfile->objfile_obstack, struct dwarf2_locexpr_baton);
17135 baton->per_cu = cu->per_cu;
17136 gdb_assert (baton->per_cu);
17138 baton->size = 5 /* DW_OP_call4 */ + 1 /* DW_OP_plus */;
17140 if (attr_form_is_constant (member_loc))
17142 offset = dwarf2_get_attr_constant_value (member_loc, 0);
17143 baton->size += 1 /* DW_OP_addr */ + cu->header.addr_size;
17146 baton->size += DW_BLOCK (member_loc)->size;
17148 ptr = (gdb_byte *) obstack_alloc (&objfile->objfile_obstack, baton->size);
17151 *ptr++ = DW_OP_call4;
17152 cu_off = common_die->sect_off - cu->per_cu->sect_off;
17153 store_unsigned_integer (ptr, 4, byte_order, cu_off);
17156 if (attr_form_is_constant (member_loc))
17158 *ptr++ = DW_OP_addr;
17159 store_unsigned_integer (ptr, cu->header.addr_size, byte_order, offset);
17160 ptr += cu->header.addr_size;
17164 /* We have to copy the data here, because DW_OP_call4 will only
17165 use a DW_AT_location attribute. */
17166 memcpy (ptr, DW_BLOCK (member_loc)->data, DW_BLOCK (member_loc)->size);
17167 ptr += DW_BLOCK (member_loc)->size;
17170 *ptr++ = DW_OP_plus;
17171 gdb_assert (ptr - baton->data == baton->size);
17173 SYMBOL_LOCATION_BATON (sym) = baton;
17174 SYMBOL_ACLASS_INDEX (sym) = dwarf2_locexpr_index;
17177 /* Create appropriate locally-scoped variables for all the
17178 DW_TAG_common_block entries. Also create a struct common_block
17179 listing all such variables for `info common'. COMMON_BLOCK_DOMAIN
17180 is used to sepate the common blocks name namespace from regular
17184 read_common_block (struct die_info *die, struct dwarf2_cu *cu)
17186 struct attribute *attr;
17188 attr = dwarf2_attr (die, DW_AT_location, cu);
17191 /* Support the .debug_loc offsets. */
17192 if (attr_form_is_block (attr))
17196 else if (attr_form_is_section_offset (attr))
17198 dwarf2_complex_location_expr_complaint ();
17203 dwarf2_invalid_attrib_class_complaint ("DW_AT_location",
17204 "common block member");
17209 if (die->child != NULL)
17211 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
17212 struct die_info *child_die;
17213 size_t n_entries = 0, size;
17214 struct common_block *common_block;
17215 struct symbol *sym;
17217 for (child_die = die->child;
17218 child_die && child_die->tag;
17219 child_die = sibling_die (child_die))
17222 size = (sizeof (struct common_block)
17223 + (n_entries - 1) * sizeof (struct symbol *));
17225 = (struct common_block *) obstack_alloc (&objfile->objfile_obstack,
17227 memset (common_block->contents, 0, n_entries * sizeof (struct symbol *));
17228 common_block->n_entries = 0;
17230 for (child_die = die->child;
17231 child_die && child_die->tag;
17232 child_die = sibling_die (child_die))
17234 /* Create the symbol in the DW_TAG_common_block block in the current
17236 sym = new_symbol (child_die, NULL, cu);
17239 struct attribute *member_loc;
17241 common_block->contents[common_block->n_entries++] = sym;
17243 member_loc = dwarf2_attr (child_die, DW_AT_data_member_location,
17247 /* GDB has handled this for a long time, but it is
17248 not specified by DWARF. It seems to have been
17249 emitted by gfortran at least as recently as:
17250 http://gcc.gnu.org/bugzilla/show_bug.cgi?id=23057. */
17251 complaint (&symfile_complaints,
17252 _("Variable in common block has "
17253 "DW_AT_data_member_location "
17254 "- DIE at %s [in module %s]"),
17255 sect_offset_str (child_die->sect_off),
17256 objfile_name (objfile));
17258 if (attr_form_is_section_offset (member_loc))
17259 dwarf2_complex_location_expr_complaint ();
17260 else if (attr_form_is_constant (member_loc)
17261 || attr_form_is_block (member_loc))
17264 mark_common_block_symbol_computed (sym, die, attr,
17268 dwarf2_complex_location_expr_complaint ();
17273 sym = new_symbol (die, objfile_type (objfile)->builtin_void, cu);
17274 SYMBOL_VALUE_COMMON_BLOCK (sym) = common_block;
17278 /* Create a type for a C++ namespace. */
17280 static struct type *
17281 read_namespace_type (struct die_info *die, struct dwarf2_cu *cu)
17283 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
17284 const char *previous_prefix, *name;
17288 /* For extensions, reuse the type of the original namespace. */
17289 if (dwarf2_attr (die, DW_AT_extension, cu) != NULL)
17291 struct die_info *ext_die;
17292 struct dwarf2_cu *ext_cu = cu;
17294 ext_die = dwarf2_extension (die, &ext_cu);
17295 type = read_type_die (ext_die, ext_cu);
17297 /* EXT_CU may not be the same as CU.
17298 Ensure TYPE is recorded with CU in die_type_hash. */
17299 return set_die_type (die, type, cu);
17302 name = namespace_name (die, &is_anonymous, cu);
17304 /* Now build the name of the current namespace. */
17306 previous_prefix = determine_prefix (die, cu);
17307 if (previous_prefix[0] != '\0')
17308 name = typename_concat (&objfile->objfile_obstack,
17309 previous_prefix, name, 0, cu);
17311 /* Create the type. */
17312 type = init_type (objfile, TYPE_CODE_NAMESPACE, 0, name);
17313 TYPE_TAG_NAME (type) = TYPE_NAME (type);
17315 return set_die_type (die, type, cu);
17318 /* Read a namespace scope. */
17321 read_namespace (struct die_info *die, struct dwarf2_cu *cu)
17323 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
17326 /* Add a symbol associated to this if we haven't seen the namespace
17327 before. Also, add a using directive if it's an anonymous
17330 if (dwarf2_attr (die, DW_AT_extension, cu) == NULL)
17334 type = read_type_die (die, cu);
17335 new_symbol (die, type, cu);
17337 namespace_name (die, &is_anonymous, cu);
17340 const char *previous_prefix = determine_prefix (die, cu);
17342 std::vector<const char *> excludes;
17343 add_using_directive (using_directives (cu->language),
17344 previous_prefix, TYPE_NAME (type), NULL,
17345 NULL, excludes, 0, &objfile->objfile_obstack);
17349 if (die->child != NULL)
17351 struct die_info *child_die = die->child;
17353 while (child_die && child_die->tag)
17355 process_die (child_die, cu);
17356 child_die = sibling_die (child_die);
17361 /* Read a Fortran module as type. This DIE can be only a declaration used for
17362 imported module. Still we need that type as local Fortran "use ... only"
17363 declaration imports depend on the created type in determine_prefix. */
17365 static struct type *
17366 read_module_type (struct die_info *die, struct dwarf2_cu *cu)
17368 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
17369 const char *module_name;
17372 module_name = dwarf2_name (die, cu);
17374 complaint (&symfile_complaints,
17375 _("DW_TAG_module has no name, offset %s"),
17376 sect_offset_str (die->sect_off));
17377 type = init_type (objfile, TYPE_CODE_MODULE, 0, module_name);
17379 /* determine_prefix uses TYPE_TAG_NAME. */
17380 TYPE_TAG_NAME (type) = TYPE_NAME (type);
17382 return set_die_type (die, type, cu);
17385 /* Read a Fortran module. */
17388 read_module (struct die_info *die, struct dwarf2_cu *cu)
17390 struct die_info *child_die = die->child;
17393 type = read_type_die (die, cu);
17394 new_symbol (die, type, cu);
17396 while (child_die && child_die->tag)
17398 process_die (child_die, cu);
17399 child_die = sibling_die (child_die);
17403 /* Return the name of the namespace represented by DIE. Set
17404 *IS_ANONYMOUS to tell whether or not the namespace is an anonymous
17407 static const char *
17408 namespace_name (struct die_info *die, int *is_anonymous, struct dwarf2_cu *cu)
17410 struct die_info *current_die;
17411 const char *name = NULL;
17413 /* Loop through the extensions until we find a name. */
17415 for (current_die = die;
17416 current_die != NULL;
17417 current_die = dwarf2_extension (die, &cu))
17419 /* We don't use dwarf2_name here so that we can detect the absence
17420 of a name -> anonymous namespace. */
17421 name = dwarf2_string_attr (die, DW_AT_name, cu);
17427 /* Is it an anonymous namespace? */
17429 *is_anonymous = (name == NULL);
17431 name = CP_ANONYMOUS_NAMESPACE_STR;
17436 /* Extract all information from a DW_TAG_pointer_type DIE and add to
17437 the user defined type vector. */
17439 static struct type *
17440 read_tag_pointer_type (struct die_info *die, struct dwarf2_cu *cu)
17442 struct gdbarch *gdbarch
17443 = get_objfile_arch (cu->per_cu->dwarf2_per_objfile->objfile);
17444 struct comp_unit_head *cu_header = &cu->header;
17446 struct attribute *attr_byte_size;
17447 struct attribute *attr_address_class;
17448 int byte_size, addr_class;
17449 struct type *target_type;
17451 target_type = die_type (die, cu);
17453 /* The die_type call above may have already set the type for this DIE. */
17454 type = get_die_type (die, cu);
17458 type = lookup_pointer_type (target_type);
17460 attr_byte_size = dwarf2_attr (die, DW_AT_byte_size, cu);
17461 if (attr_byte_size)
17462 byte_size = DW_UNSND (attr_byte_size);
17464 byte_size = cu_header->addr_size;
17466 attr_address_class = dwarf2_attr (die, DW_AT_address_class, cu);
17467 if (attr_address_class)
17468 addr_class = DW_UNSND (attr_address_class);
17470 addr_class = DW_ADDR_none;
17472 /* If the pointer size or address class is different than the
17473 default, create a type variant marked as such and set the
17474 length accordingly. */
17475 if (TYPE_LENGTH (type) != byte_size || addr_class != DW_ADDR_none)
17477 if (gdbarch_address_class_type_flags_p (gdbarch))
17481 type_flags = gdbarch_address_class_type_flags
17482 (gdbarch, byte_size, addr_class);
17483 gdb_assert ((type_flags & ~TYPE_INSTANCE_FLAG_ADDRESS_CLASS_ALL)
17485 type = make_type_with_address_space (type, type_flags);
17487 else if (TYPE_LENGTH (type) != byte_size)
17489 complaint (&symfile_complaints,
17490 _("invalid pointer size %d"), byte_size);
17494 /* Should we also complain about unhandled address classes? */
17498 TYPE_LENGTH (type) = byte_size;
17499 return set_die_type (die, type, cu);
17502 /* Extract all information from a DW_TAG_ptr_to_member_type DIE and add to
17503 the user defined type vector. */
17505 static struct type *
17506 read_tag_ptr_to_member_type (struct die_info *die, struct dwarf2_cu *cu)
17509 struct type *to_type;
17510 struct type *domain;
17512 to_type = die_type (die, cu);
17513 domain = die_containing_type (die, cu);
17515 /* The calls above may have already set the type for this DIE. */
17516 type = get_die_type (die, cu);
17520 if (TYPE_CODE (check_typedef (to_type)) == TYPE_CODE_METHOD)
17521 type = lookup_methodptr_type (to_type);
17522 else if (TYPE_CODE (check_typedef (to_type)) == TYPE_CODE_FUNC)
17524 struct type *new_type
17525 = alloc_type (cu->per_cu->dwarf2_per_objfile->objfile);
17527 smash_to_method_type (new_type, domain, TYPE_TARGET_TYPE (to_type),
17528 TYPE_FIELDS (to_type), TYPE_NFIELDS (to_type),
17529 TYPE_VARARGS (to_type));
17530 type = lookup_methodptr_type (new_type);
17533 type = lookup_memberptr_type (to_type, domain);
17535 return set_die_type (die, type, cu);
17538 /* Extract all information from a DW_TAG_{rvalue_,}reference_type DIE and add to
17539 the user defined type vector. */
17541 static struct type *
17542 read_tag_reference_type (struct die_info *die, struct dwarf2_cu *cu,
17543 enum type_code refcode)
17545 struct comp_unit_head *cu_header = &cu->header;
17546 struct type *type, *target_type;
17547 struct attribute *attr;
17549 gdb_assert (refcode == TYPE_CODE_REF || refcode == TYPE_CODE_RVALUE_REF);
17551 target_type = die_type (die, cu);
17553 /* The die_type call above may have already set the type for this DIE. */
17554 type = get_die_type (die, cu);
17558 type = lookup_reference_type (target_type, refcode);
17559 attr = dwarf2_attr (die, DW_AT_byte_size, cu);
17562 TYPE_LENGTH (type) = DW_UNSND (attr);
17566 TYPE_LENGTH (type) = cu_header->addr_size;
17568 return set_die_type (die, type, cu);
17571 /* Add the given cv-qualifiers to the element type of the array. GCC
17572 outputs DWARF type qualifiers that apply to an array, not the
17573 element type. But GDB relies on the array element type to carry
17574 the cv-qualifiers. This mimics section 6.7.3 of the C99
17577 static struct type *
17578 add_array_cv_type (struct die_info *die, struct dwarf2_cu *cu,
17579 struct type *base_type, int cnst, int voltl)
17581 struct type *el_type, *inner_array;
17583 base_type = copy_type (base_type);
17584 inner_array = base_type;
17586 while (TYPE_CODE (TYPE_TARGET_TYPE (inner_array)) == TYPE_CODE_ARRAY)
17588 TYPE_TARGET_TYPE (inner_array) =
17589 copy_type (TYPE_TARGET_TYPE (inner_array));
17590 inner_array = TYPE_TARGET_TYPE (inner_array);
17593 el_type = TYPE_TARGET_TYPE (inner_array);
17594 cnst |= TYPE_CONST (el_type);
17595 voltl |= TYPE_VOLATILE (el_type);
17596 TYPE_TARGET_TYPE (inner_array) = make_cv_type (cnst, voltl, el_type, NULL);
17598 return set_die_type (die, base_type, cu);
17601 static struct type *
17602 read_tag_const_type (struct die_info *die, struct dwarf2_cu *cu)
17604 struct type *base_type, *cv_type;
17606 base_type = die_type (die, cu);
17608 /* The die_type call above may have already set the type for this DIE. */
17609 cv_type = get_die_type (die, cu);
17613 /* In case the const qualifier is applied to an array type, the element type
17614 is so qualified, not the array type (section 6.7.3 of C99). */
17615 if (TYPE_CODE (base_type) == TYPE_CODE_ARRAY)
17616 return add_array_cv_type (die, cu, base_type, 1, 0);
17618 cv_type = make_cv_type (1, TYPE_VOLATILE (base_type), base_type, 0);
17619 return set_die_type (die, cv_type, cu);
17622 static struct type *
17623 read_tag_volatile_type (struct die_info *die, struct dwarf2_cu *cu)
17625 struct type *base_type, *cv_type;
17627 base_type = die_type (die, cu);
17629 /* The die_type call above may have already set the type for this DIE. */
17630 cv_type = get_die_type (die, cu);
17634 /* In case the volatile qualifier is applied to an array type, the
17635 element type is so qualified, not the array type (section 6.7.3
17637 if (TYPE_CODE (base_type) == TYPE_CODE_ARRAY)
17638 return add_array_cv_type (die, cu, base_type, 0, 1);
17640 cv_type = make_cv_type (TYPE_CONST (base_type), 1, base_type, 0);
17641 return set_die_type (die, cv_type, cu);
17644 /* Handle DW_TAG_restrict_type. */
17646 static struct type *
17647 read_tag_restrict_type (struct die_info *die, struct dwarf2_cu *cu)
17649 struct type *base_type, *cv_type;
17651 base_type = die_type (die, cu);
17653 /* The die_type call above may have already set the type for this DIE. */
17654 cv_type = get_die_type (die, cu);
17658 cv_type = make_restrict_type (base_type);
17659 return set_die_type (die, cv_type, cu);
17662 /* Handle DW_TAG_atomic_type. */
17664 static struct type *
17665 read_tag_atomic_type (struct die_info *die, struct dwarf2_cu *cu)
17667 struct type *base_type, *cv_type;
17669 base_type = die_type (die, cu);
17671 /* The die_type call above may have already set the type for this DIE. */
17672 cv_type = get_die_type (die, cu);
17676 cv_type = make_atomic_type (base_type);
17677 return set_die_type (die, cv_type, cu);
17680 /* Extract all information from a DW_TAG_string_type DIE and add to
17681 the user defined type vector. It isn't really a user defined type,
17682 but it behaves like one, with other DIE's using an AT_user_def_type
17683 attribute to reference it. */
17685 static struct type *
17686 read_tag_string_type (struct die_info *die, struct dwarf2_cu *cu)
17688 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
17689 struct gdbarch *gdbarch = get_objfile_arch (objfile);
17690 struct type *type, *range_type, *index_type, *char_type;
17691 struct attribute *attr;
17692 unsigned int length;
17694 attr = dwarf2_attr (die, DW_AT_string_length, cu);
17697 length = DW_UNSND (attr);
17701 /* Check for the DW_AT_byte_size attribute. */
17702 attr = dwarf2_attr (die, DW_AT_byte_size, cu);
17705 length = DW_UNSND (attr);
17713 index_type = objfile_type (objfile)->builtin_int;
17714 range_type = create_static_range_type (NULL, index_type, 1, length);
17715 char_type = language_string_char_type (cu->language_defn, gdbarch);
17716 type = create_string_type (NULL, char_type, range_type);
17718 return set_die_type (die, type, cu);
17721 /* Assuming that DIE corresponds to a function, returns nonzero
17722 if the function is prototyped. */
17725 prototyped_function_p (struct die_info *die, struct dwarf2_cu *cu)
17727 struct attribute *attr;
17729 attr = dwarf2_attr (die, DW_AT_prototyped, cu);
17730 if (attr && (DW_UNSND (attr) != 0))
17733 /* The DWARF standard implies that the DW_AT_prototyped attribute
17734 is only meaninful for C, but the concept also extends to other
17735 languages that allow unprototyped functions (Eg: Objective C).
17736 For all other languages, assume that functions are always
17738 if (cu->language != language_c
17739 && cu->language != language_objc
17740 && cu->language != language_opencl)
17743 /* RealView does not emit DW_AT_prototyped. We can not distinguish
17744 prototyped and unprototyped functions; default to prototyped,
17745 since that is more common in modern code (and RealView warns
17746 about unprototyped functions). */
17747 if (producer_is_realview (cu->producer))
17753 /* Handle DIES due to C code like:
17757 int (*funcp)(int a, long l);
17761 ('funcp' generates a DW_TAG_subroutine_type DIE). */
17763 static struct type *
17764 read_subroutine_type (struct die_info *die, struct dwarf2_cu *cu)
17766 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
17767 struct type *type; /* Type that this function returns. */
17768 struct type *ftype; /* Function that returns above type. */
17769 struct attribute *attr;
17771 type = die_type (die, cu);
17773 /* The die_type call above may have already set the type for this DIE. */
17774 ftype = get_die_type (die, cu);
17778 ftype = lookup_function_type (type);
17780 if (prototyped_function_p (die, cu))
17781 TYPE_PROTOTYPED (ftype) = 1;
17783 /* Store the calling convention in the type if it's available in
17784 the subroutine die. Otherwise set the calling convention to
17785 the default value DW_CC_normal. */
17786 attr = dwarf2_attr (die, DW_AT_calling_convention, cu);
17788 TYPE_CALLING_CONVENTION (ftype) = DW_UNSND (attr);
17789 else if (cu->producer && strstr (cu->producer, "IBM XL C for OpenCL"))
17790 TYPE_CALLING_CONVENTION (ftype) = DW_CC_GDB_IBM_OpenCL;
17792 TYPE_CALLING_CONVENTION (ftype) = DW_CC_normal;
17794 /* Record whether the function returns normally to its caller or not
17795 if the DWARF producer set that information. */
17796 attr = dwarf2_attr (die, DW_AT_noreturn, cu);
17797 if (attr && (DW_UNSND (attr) != 0))
17798 TYPE_NO_RETURN (ftype) = 1;
17800 /* We need to add the subroutine type to the die immediately so
17801 we don't infinitely recurse when dealing with parameters
17802 declared as the same subroutine type. */
17803 set_die_type (die, ftype, cu);
17805 if (die->child != NULL)
17807 struct type *void_type = objfile_type (objfile)->builtin_void;
17808 struct die_info *child_die;
17809 int nparams, iparams;
17811 /* Count the number of parameters.
17812 FIXME: GDB currently ignores vararg functions, but knows about
17813 vararg member functions. */
17815 child_die = die->child;
17816 while (child_die && child_die->tag)
17818 if (child_die->tag == DW_TAG_formal_parameter)
17820 else if (child_die->tag == DW_TAG_unspecified_parameters)
17821 TYPE_VARARGS (ftype) = 1;
17822 child_die = sibling_die (child_die);
17825 /* Allocate storage for parameters and fill them in. */
17826 TYPE_NFIELDS (ftype) = nparams;
17827 TYPE_FIELDS (ftype) = (struct field *)
17828 TYPE_ZALLOC (ftype, nparams * sizeof (struct field));
17830 /* TYPE_FIELD_TYPE must never be NULL. Pre-fill the array to ensure it
17831 even if we error out during the parameters reading below. */
17832 for (iparams = 0; iparams < nparams; iparams++)
17833 TYPE_FIELD_TYPE (ftype, iparams) = void_type;
17836 child_die = die->child;
17837 while (child_die && child_die->tag)
17839 if (child_die->tag == DW_TAG_formal_parameter)
17841 struct type *arg_type;
17843 /* DWARF version 2 has no clean way to discern C++
17844 static and non-static member functions. G++ helps
17845 GDB by marking the first parameter for non-static
17846 member functions (which is the this pointer) as
17847 artificial. We pass this information to
17848 dwarf2_add_member_fn via TYPE_FIELD_ARTIFICIAL.
17850 DWARF version 3 added DW_AT_object_pointer, which GCC
17851 4.5 does not yet generate. */
17852 attr = dwarf2_attr (child_die, DW_AT_artificial, cu);
17854 TYPE_FIELD_ARTIFICIAL (ftype, iparams) = DW_UNSND (attr);
17856 TYPE_FIELD_ARTIFICIAL (ftype, iparams) = 0;
17857 arg_type = die_type (child_die, cu);
17859 /* RealView does not mark THIS as const, which the testsuite
17860 expects. GCC marks THIS as const in method definitions,
17861 but not in the class specifications (GCC PR 43053). */
17862 if (cu->language == language_cplus && !TYPE_CONST (arg_type)
17863 && TYPE_FIELD_ARTIFICIAL (ftype, iparams))
17866 struct dwarf2_cu *arg_cu = cu;
17867 const char *name = dwarf2_name (child_die, cu);
17869 attr = dwarf2_attr (die, DW_AT_object_pointer, cu);
17872 /* If the compiler emits this, use it. */
17873 if (follow_die_ref (die, attr, &arg_cu) == child_die)
17876 else if (name && strcmp (name, "this") == 0)
17877 /* Function definitions will have the argument names. */
17879 else if (name == NULL && iparams == 0)
17880 /* Declarations may not have the names, so like
17881 elsewhere in GDB, assume an artificial first
17882 argument is "this". */
17886 arg_type = make_cv_type (1, TYPE_VOLATILE (arg_type),
17890 TYPE_FIELD_TYPE (ftype, iparams) = arg_type;
17893 child_die = sibling_die (child_die);
17900 static struct type *
17901 read_typedef (struct die_info *die, struct dwarf2_cu *cu)
17903 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
17904 const char *name = NULL;
17905 struct type *this_type, *target_type;
17907 name = dwarf2_full_name (NULL, die, cu);
17908 this_type = init_type (objfile, TYPE_CODE_TYPEDEF, 0, name);
17909 TYPE_TARGET_STUB (this_type) = 1;
17910 set_die_type (die, this_type, cu);
17911 target_type = die_type (die, cu);
17912 if (target_type != this_type)
17913 TYPE_TARGET_TYPE (this_type) = target_type;
17916 /* Self-referential typedefs are, it seems, not allowed by the DWARF
17917 spec and cause infinite loops in GDB. */
17918 complaint (&symfile_complaints,
17919 _("Self-referential DW_TAG_typedef "
17920 "- DIE at %s [in module %s]"),
17921 sect_offset_str (die->sect_off), objfile_name (objfile));
17922 TYPE_TARGET_TYPE (this_type) = NULL;
17927 /* Allocate a floating-point type of size BITS and name NAME. Pass NAME_HINT
17928 (which may be different from NAME) to the architecture back-end to allow
17929 it to guess the correct format if necessary. */
17931 static struct type *
17932 dwarf2_init_float_type (struct objfile *objfile, int bits, const char *name,
17933 const char *name_hint)
17935 struct gdbarch *gdbarch = get_objfile_arch (objfile);
17936 const struct floatformat **format;
17939 format = gdbarch_floatformat_for_type (gdbarch, name_hint, bits);
17941 type = init_float_type (objfile, bits, name, format);
17943 type = init_type (objfile, TYPE_CODE_ERROR, bits, name);
17948 /* Find a representation of a given base type and install
17949 it in the TYPE field of the die. */
17951 static struct type *
17952 read_base_type (struct die_info *die, struct dwarf2_cu *cu)
17954 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
17956 struct attribute *attr;
17957 int encoding = 0, bits = 0;
17960 attr = dwarf2_attr (die, DW_AT_encoding, cu);
17963 encoding = DW_UNSND (attr);
17965 attr = dwarf2_attr (die, DW_AT_byte_size, cu);
17968 bits = DW_UNSND (attr) * TARGET_CHAR_BIT;
17970 name = dwarf2_name (die, cu);
17973 complaint (&symfile_complaints,
17974 _("DW_AT_name missing from DW_TAG_base_type"));
17979 case DW_ATE_address:
17980 /* Turn DW_ATE_address into a void * pointer. */
17981 type = init_type (objfile, TYPE_CODE_VOID, TARGET_CHAR_BIT, NULL);
17982 type = init_pointer_type (objfile, bits, name, type);
17984 case DW_ATE_boolean:
17985 type = init_boolean_type (objfile, bits, 1, name);
17987 case DW_ATE_complex_float:
17988 type = dwarf2_init_float_type (objfile, bits / 2, NULL, name);
17989 type = init_complex_type (objfile, name, type);
17991 case DW_ATE_decimal_float:
17992 type = init_decfloat_type (objfile, bits, name);
17995 type = dwarf2_init_float_type (objfile, bits, name, name);
17997 case DW_ATE_signed:
17998 type = init_integer_type (objfile, bits, 0, name);
18000 case DW_ATE_unsigned:
18001 if (cu->language == language_fortran
18003 && startswith (name, "character("))
18004 type = init_character_type (objfile, bits, 1, name);
18006 type = init_integer_type (objfile, bits, 1, name);
18008 case DW_ATE_signed_char:
18009 if (cu->language == language_ada || cu->language == language_m2
18010 || cu->language == language_pascal
18011 || cu->language == language_fortran)
18012 type = init_character_type (objfile, bits, 0, name);
18014 type = init_integer_type (objfile, bits, 0, name);
18016 case DW_ATE_unsigned_char:
18017 if (cu->language == language_ada || cu->language == language_m2
18018 || cu->language == language_pascal
18019 || cu->language == language_fortran
18020 || cu->language == language_rust)
18021 type = init_character_type (objfile, bits, 1, name);
18023 type = init_integer_type (objfile, bits, 1, name);
18027 gdbarch *arch = get_objfile_arch (objfile);
18030 type = builtin_type (arch)->builtin_char16;
18031 else if (bits == 32)
18032 type = builtin_type (arch)->builtin_char32;
18035 complaint (&symfile_complaints,
18036 _("unsupported DW_ATE_UTF bit size: '%d'"),
18038 type = init_integer_type (objfile, bits, 1, name);
18040 return set_die_type (die, type, cu);
18045 complaint (&symfile_complaints, _("unsupported DW_AT_encoding: '%s'"),
18046 dwarf_type_encoding_name (encoding));
18047 type = init_type (objfile, TYPE_CODE_ERROR, bits, name);
18051 if (name && strcmp (name, "char") == 0)
18052 TYPE_NOSIGN (type) = 1;
18054 return set_die_type (die, type, cu);
18057 /* Parse dwarf attribute if it's a block, reference or constant and put the
18058 resulting value of the attribute into struct bound_prop.
18059 Returns 1 if ATTR could be resolved into PROP, 0 otherwise. */
18062 attr_to_dynamic_prop (const struct attribute *attr, struct die_info *die,
18063 struct dwarf2_cu *cu, struct dynamic_prop *prop)
18065 struct dwarf2_property_baton *baton;
18066 struct obstack *obstack
18067 = &cu->per_cu->dwarf2_per_objfile->objfile->objfile_obstack;
18069 if (attr == NULL || prop == NULL)
18072 if (attr_form_is_block (attr))
18074 baton = XOBNEW (obstack, struct dwarf2_property_baton);
18075 baton->referenced_type = NULL;
18076 baton->locexpr.per_cu = cu->per_cu;
18077 baton->locexpr.size = DW_BLOCK (attr)->size;
18078 baton->locexpr.data = DW_BLOCK (attr)->data;
18079 prop->data.baton = baton;
18080 prop->kind = PROP_LOCEXPR;
18081 gdb_assert (prop->data.baton != NULL);
18083 else if (attr_form_is_ref (attr))
18085 struct dwarf2_cu *target_cu = cu;
18086 struct die_info *target_die;
18087 struct attribute *target_attr;
18089 target_die = follow_die_ref (die, attr, &target_cu);
18090 target_attr = dwarf2_attr (target_die, DW_AT_location, target_cu);
18091 if (target_attr == NULL)
18092 target_attr = dwarf2_attr (target_die, DW_AT_data_member_location,
18094 if (target_attr == NULL)
18097 switch (target_attr->name)
18099 case DW_AT_location:
18100 if (attr_form_is_section_offset (target_attr))
18102 baton = XOBNEW (obstack, struct dwarf2_property_baton);
18103 baton->referenced_type = die_type (target_die, target_cu);
18104 fill_in_loclist_baton (cu, &baton->loclist, target_attr);
18105 prop->data.baton = baton;
18106 prop->kind = PROP_LOCLIST;
18107 gdb_assert (prop->data.baton != NULL);
18109 else if (attr_form_is_block (target_attr))
18111 baton = XOBNEW (obstack, struct dwarf2_property_baton);
18112 baton->referenced_type = die_type (target_die, target_cu);
18113 baton->locexpr.per_cu = cu->per_cu;
18114 baton->locexpr.size = DW_BLOCK (target_attr)->size;
18115 baton->locexpr.data = DW_BLOCK (target_attr)->data;
18116 prop->data.baton = baton;
18117 prop->kind = PROP_LOCEXPR;
18118 gdb_assert (prop->data.baton != NULL);
18122 dwarf2_invalid_attrib_class_complaint ("DW_AT_location",
18123 "dynamic property");
18127 case DW_AT_data_member_location:
18131 if (!handle_data_member_location (target_die, target_cu,
18135 baton = XOBNEW (obstack, struct dwarf2_property_baton);
18136 baton->referenced_type = read_type_die (target_die->parent,
18138 baton->offset_info.offset = offset;
18139 baton->offset_info.type = die_type (target_die, target_cu);
18140 prop->data.baton = baton;
18141 prop->kind = PROP_ADDR_OFFSET;
18146 else if (attr_form_is_constant (attr))
18148 prop->data.const_val = dwarf2_get_attr_constant_value (attr, 0);
18149 prop->kind = PROP_CONST;
18153 dwarf2_invalid_attrib_class_complaint (dwarf_form_name (attr->form),
18154 dwarf2_name (die, cu));
18161 /* Read the given DW_AT_subrange DIE. */
18163 static struct type *
18164 read_subrange_type (struct die_info *die, struct dwarf2_cu *cu)
18166 struct type *base_type, *orig_base_type;
18167 struct type *range_type;
18168 struct attribute *attr;
18169 struct dynamic_prop low, high;
18170 int low_default_is_valid;
18171 int high_bound_is_count = 0;
18173 LONGEST negative_mask;
18175 orig_base_type = die_type (die, cu);
18176 /* If ORIG_BASE_TYPE is a typedef, it will not be TYPE_UNSIGNED,
18177 whereas the real type might be. So, we use ORIG_BASE_TYPE when
18178 creating the range type, but we use the result of check_typedef
18179 when examining properties of the type. */
18180 base_type = check_typedef (orig_base_type);
18182 /* The die_type call above may have already set the type for this DIE. */
18183 range_type = get_die_type (die, cu);
18187 low.kind = PROP_CONST;
18188 high.kind = PROP_CONST;
18189 high.data.const_val = 0;
18191 /* Set LOW_DEFAULT_IS_VALID if current language and DWARF version allow
18192 omitting DW_AT_lower_bound. */
18193 switch (cu->language)
18196 case language_cplus:
18197 low.data.const_val = 0;
18198 low_default_is_valid = 1;
18200 case language_fortran:
18201 low.data.const_val = 1;
18202 low_default_is_valid = 1;
18205 case language_objc:
18206 case language_rust:
18207 low.data.const_val = 0;
18208 low_default_is_valid = (cu->header.version >= 4);
18212 case language_pascal:
18213 low.data.const_val = 1;
18214 low_default_is_valid = (cu->header.version >= 4);
18217 low.data.const_val = 0;
18218 low_default_is_valid = 0;
18222 attr = dwarf2_attr (die, DW_AT_lower_bound, cu);
18224 attr_to_dynamic_prop (attr, die, cu, &low);
18225 else if (!low_default_is_valid)
18226 complaint (&symfile_complaints, _("Missing DW_AT_lower_bound "
18227 "- DIE at %s [in module %s]"),
18228 sect_offset_str (die->sect_off),
18229 objfile_name (cu->per_cu->dwarf2_per_objfile->objfile));
18231 attr = dwarf2_attr (die, DW_AT_upper_bound, cu);
18232 if (!attr_to_dynamic_prop (attr, die, cu, &high))
18234 attr = dwarf2_attr (die, DW_AT_count, cu);
18235 if (attr_to_dynamic_prop (attr, die, cu, &high))
18237 /* If bounds are constant do the final calculation here. */
18238 if (low.kind == PROP_CONST && high.kind == PROP_CONST)
18239 high.data.const_val = low.data.const_val + high.data.const_val - 1;
18241 high_bound_is_count = 1;
18245 /* Dwarf-2 specifications explicitly allows to create subrange types
18246 without specifying a base type.
18247 In that case, the base type must be set to the type of
18248 the lower bound, upper bound or count, in that order, if any of these
18249 three attributes references an object that has a type.
18250 If no base type is found, the Dwarf-2 specifications say that
18251 a signed integer type of size equal to the size of an address should
18253 For the following C code: `extern char gdb_int [];'
18254 GCC produces an empty range DIE.
18255 FIXME: muller/2010-05-28: Possible references to object for low bound,
18256 high bound or count are not yet handled by this code. */
18257 if (TYPE_CODE (base_type) == TYPE_CODE_VOID)
18259 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
18260 struct gdbarch *gdbarch = get_objfile_arch (objfile);
18261 int addr_size = gdbarch_addr_bit (gdbarch) /8;
18262 struct type *int_type = objfile_type (objfile)->builtin_int;
18264 /* Test "int", "long int", and "long long int" objfile types,
18265 and select the first one having a size above or equal to the
18266 architecture address size. */
18267 if (int_type && TYPE_LENGTH (int_type) >= addr_size)
18268 base_type = int_type;
18271 int_type = objfile_type (objfile)->builtin_long;
18272 if (int_type && TYPE_LENGTH (int_type) >= addr_size)
18273 base_type = int_type;
18276 int_type = objfile_type (objfile)->builtin_long_long;
18277 if (int_type && TYPE_LENGTH (int_type) >= addr_size)
18278 base_type = int_type;
18283 /* Normally, the DWARF producers are expected to use a signed
18284 constant form (Eg. DW_FORM_sdata) to express negative bounds.
18285 But this is unfortunately not always the case, as witnessed
18286 with GCC, for instance, where the ambiguous DW_FORM_dataN form
18287 is used instead. To work around that ambiguity, we treat
18288 the bounds as signed, and thus sign-extend their values, when
18289 the base type is signed. */
18291 -((LONGEST) 1 << (TYPE_LENGTH (base_type) * TARGET_CHAR_BIT - 1));
18292 if (low.kind == PROP_CONST
18293 && !TYPE_UNSIGNED (base_type) && (low.data.const_val & negative_mask))
18294 low.data.const_val |= negative_mask;
18295 if (high.kind == PROP_CONST
18296 && !TYPE_UNSIGNED (base_type) && (high.data.const_val & negative_mask))
18297 high.data.const_val |= negative_mask;
18299 range_type = create_range_type (NULL, orig_base_type, &low, &high);
18301 if (high_bound_is_count)
18302 TYPE_RANGE_DATA (range_type)->flag_upper_bound_is_count = 1;
18304 /* Ada expects an empty array on no boundary attributes. */
18305 if (attr == NULL && cu->language != language_ada)
18306 TYPE_HIGH_BOUND_KIND (range_type) = PROP_UNDEFINED;
18308 name = dwarf2_name (die, cu);
18310 TYPE_NAME (range_type) = name;
18312 attr = dwarf2_attr (die, DW_AT_byte_size, cu);
18314 TYPE_LENGTH (range_type) = DW_UNSND (attr);
18316 set_die_type (die, range_type, cu);
18318 /* set_die_type should be already done. */
18319 set_descriptive_type (range_type, die, cu);
18324 static struct type *
18325 read_unspecified_type (struct die_info *die, struct dwarf2_cu *cu)
18329 type = init_type (cu->per_cu->dwarf2_per_objfile->objfile, TYPE_CODE_VOID,0,
18331 TYPE_NAME (type) = dwarf2_name (die, cu);
18333 /* In Ada, an unspecified type is typically used when the description
18334 of the type is defered to a different unit. When encountering
18335 such a type, we treat it as a stub, and try to resolve it later on,
18337 if (cu->language == language_ada)
18338 TYPE_STUB (type) = 1;
18340 return set_die_type (die, type, cu);
18343 /* Read a single die and all its descendents. Set the die's sibling
18344 field to NULL; set other fields in the die correctly, and set all
18345 of the descendents' fields correctly. Set *NEW_INFO_PTR to the
18346 location of the info_ptr after reading all of those dies. PARENT
18347 is the parent of the die in question. */
18349 static struct die_info *
18350 read_die_and_children (const struct die_reader_specs *reader,
18351 const gdb_byte *info_ptr,
18352 const gdb_byte **new_info_ptr,
18353 struct die_info *parent)
18355 struct die_info *die;
18356 const gdb_byte *cur_ptr;
18359 cur_ptr = read_full_die_1 (reader, &die, info_ptr, &has_children, 0);
18362 *new_info_ptr = cur_ptr;
18365 store_in_ref_table (die, reader->cu);
18368 die->child = read_die_and_siblings_1 (reader, cur_ptr, new_info_ptr, die);
18372 *new_info_ptr = cur_ptr;
18375 die->sibling = NULL;
18376 die->parent = parent;
18380 /* Read a die, all of its descendents, and all of its siblings; set
18381 all of the fields of all of the dies correctly. Arguments are as
18382 in read_die_and_children. */
18384 static struct die_info *
18385 read_die_and_siblings_1 (const struct die_reader_specs *reader,
18386 const gdb_byte *info_ptr,
18387 const gdb_byte **new_info_ptr,
18388 struct die_info *parent)
18390 struct die_info *first_die, *last_sibling;
18391 const gdb_byte *cur_ptr;
18393 cur_ptr = info_ptr;
18394 first_die = last_sibling = NULL;
18398 struct die_info *die
18399 = read_die_and_children (reader, cur_ptr, &cur_ptr, parent);
18403 *new_info_ptr = cur_ptr;
18410 last_sibling->sibling = die;
18412 last_sibling = die;
18416 /* Read a die, all of its descendents, and all of its siblings; set
18417 all of the fields of all of the dies correctly. Arguments are as
18418 in read_die_and_children.
18419 This the main entry point for reading a DIE and all its children. */
18421 static struct die_info *
18422 read_die_and_siblings (const struct die_reader_specs *reader,
18423 const gdb_byte *info_ptr,
18424 const gdb_byte **new_info_ptr,
18425 struct die_info *parent)
18427 struct die_info *die = read_die_and_siblings_1 (reader, info_ptr,
18428 new_info_ptr, parent);
18430 if (dwarf_die_debug)
18432 fprintf_unfiltered (gdb_stdlog,
18433 "Read die from %s@0x%x of %s:\n",
18434 get_section_name (reader->die_section),
18435 (unsigned) (info_ptr - reader->die_section->buffer),
18436 bfd_get_filename (reader->abfd));
18437 dump_die (die, dwarf_die_debug);
18443 /* Read a die and all its attributes, leave space for NUM_EXTRA_ATTRS
18445 The caller is responsible for filling in the extra attributes
18446 and updating (*DIEP)->num_attrs.
18447 Set DIEP to point to a newly allocated die with its information,
18448 except for its child, sibling, and parent fields.
18449 Set HAS_CHILDREN to tell whether the die has children or not. */
18451 static const gdb_byte *
18452 read_full_die_1 (const struct die_reader_specs *reader,
18453 struct die_info **diep, const gdb_byte *info_ptr,
18454 int *has_children, int num_extra_attrs)
18456 unsigned int abbrev_number, bytes_read, i;
18457 struct abbrev_info *abbrev;
18458 struct die_info *die;
18459 struct dwarf2_cu *cu = reader->cu;
18460 bfd *abfd = reader->abfd;
18462 sect_offset sect_off = (sect_offset) (info_ptr - reader->buffer);
18463 abbrev_number = read_unsigned_leb128 (abfd, info_ptr, &bytes_read);
18464 info_ptr += bytes_read;
18465 if (!abbrev_number)
18472 abbrev = reader->abbrev_table->lookup_abbrev (abbrev_number);
18474 error (_("Dwarf Error: could not find abbrev number %d [in module %s]"),
18476 bfd_get_filename (abfd));
18478 die = dwarf_alloc_die (cu, abbrev->num_attrs + num_extra_attrs);
18479 die->sect_off = sect_off;
18480 die->tag = abbrev->tag;
18481 die->abbrev = abbrev_number;
18483 /* Make the result usable.
18484 The caller needs to update num_attrs after adding the extra
18486 die->num_attrs = abbrev->num_attrs;
18488 for (i = 0; i < abbrev->num_attrs; ++i)
18489 info_ptr = read_attribute (reader, &die->attrs[i], &abbrev->attrs[i],
18493 *has_children = abbrev->has_children;
18497 /* Read a die and all its attributes.
18498 Set DIEP to point to a newly allocated die with its information,
18499 except for its child, sibling, and parent fields.
18500 Set HAS_CHILDREN to tell whether the die has children or not. */
18502 static const gdb_byte *
18503 read_full_die (const struct die_reader_specs *reader,
18504 struct die_info **diep, const gdb_byte *info_ptr,
18507 const gdb_byte *result;
18509 result = read_full_die_1 (reader, diep, info_ptr, has_children, 0);
18511 if (dwarf_die_debug)
18513 fprintf_unfiltered (gdb_stdlog,
18514 "Read die from %s@0x%x of %s:\n",
18515 get_section_name (reader->die_section),
18516 (unsigned) (info_ptr - reader->die_section->buffer),
18517 bfd_get_filename (reader->abfd));
18518 dump_die (*diep, dwarf_die_debug);
18524 /* Abbreviation tables.
18526 In DWARF version 2, the description of the debugging information is
18527 stored in a separate .debug_abbrev section. Before we read any
18528 dies from a section we read in all abbreviations and install them
18529 in a hash table. */
18531 /* Allocate space for a struct abbrev_info object in ABBREV_TABLE. */
18533 struct abbrev_info *
18534 abbrev_table::alloc_abbrev ()
18536 struct abbrev_info *abbrev;
18538 abbrev = XOBNEW (&abbrev_obstack, struct abbrev_info);
18539 memset (abbrev, 0, sizeof (struct abbrev_info));
18544 /* Add an abbreviation to the table. */
18547 abbrev_table::add_abbrev (unsigned int abbrev_number,
18548 struct abbrev_info *abbrev)
18550 unsigned int hash_number;
18552 hash_number = abbrev_number % ABBREV_HASH_SIZE;
18553 abbrev->next = m_abbrevs[hash_number];
18554 m_abbrevs[hash_number] = abbrev;
18557 /* Look up an abbrev in the table.
18558 Returns NULL if the abbrev is not found. */
18560 struct abbrev_info *
18561 abbrev_table::lookup_abbrev (unsigned int abbrev_number)
18563 unsigned int hash_number;
18564 struct abbrev_info *abbrev;
18566 hash_number = abbrev_number % ABBREV_HASH_SIZE;
18567 abbrev = m_abbrevs[hash_number];
18571 if (abbrev->number == abbrev_number)
18573 abbrev = abbrev->next;
18578 /* Read in an abbrev table. */
18580 static abbrev_table_up
18581 abbrev_table_read_table (struct dwarf2_per_objfile *dwarf2_per_objfile,
18582 struct dwarf2_section_info *section,
18583 sect_offset sect_off)
18585 struct objfile *objfile = dwarf2_per_objfile->objfile;
18586 bfd *abfd = get_section_bfd_owner (section);
18587 const gdb_byte *abbrev_ptr;
18588 struct abbrev_info *cur_abbrev;
18589 unsigned int abbrev_number, bytes_read, abbrev_name;
18590 unsigned int abbrev_form;
18591 struct attr_abbrev *cur_attrs;
18592 unsigned int allocated_attrs;
18594 abbrev_table_up abbrev_table (new struct abbrev_table (sect_off));
18596 dwarf2_read_section (objfile, section);
18597 abbrev_ptr = section->buffer + to_underlying (sect_off);
18598 abbrev_number = read_unsigned_leb128 (abfd, abbrev_ptr, &bytes_read);
18599 abbrev_ptr += bytes_read;
18601 allocated_attrs = ATTR_ALLOC_CHUNK;
18602 cur_attrs = XNEWVEC (struct attr_abbrev, allocated_attrs);
18604 /* Loop until we reach an abbrev number of 0. */
18605 while (abbrev_number)
18607 cur_abbrev = abbrev_table->alloc_abbrev ();
18609 /* read in abbrev header */
18610 cur_abbrev->number = abbrev_number;
18612 = (enum dwarf_tag) read_unsigned_leb128 (abfd, abbrev_ptr, &bytes_read);
18613 abbrev_ptr += bytes_read;
18614 cur_abbrev->has_children = read_1_byte (abfd, abbrev_ptr);
18617 /* now read in declarations */
18620 LONGEST implicit_const;
18622 abbrev_name = read_unsigned_leb128 (abfd, abbrev_ptr, &bytes_read);
18623 abbrev_ptr += bytes_read;
18624 abbrev_form = read_unsigned_leb128 (abfd, abbrev_ptr, &bytes_read);
18625 abbrev_ptr += bytes_read;
18626 if (abbrev_form == DW_FORM_implicit_const)
18628 implicit_const = read_signed_leb128 (abfd, abbrev_ptr,
18630 abbrev_ptr += bytes_read;
18634 /* Initialize it due to a false compiler warning. */
18635 implicit_const = -1;
18638 if (abbrev_name == 0)
18641 if (cur_abbrev->num_attrs == allocated_attrs)
18643 allocated_attrs += ATTR_ALLOC_CHUNK;
18645 = XRESIZEVEC (struct attr_abbrev, cur_attrs, allocated_attrs);
18648 cur_attrs[cur_abbrev->num_attrs].name
18649 = (enum dwarf_attribute) abbrev_name;
18650 cur_attrs[cur_abbrev->num_attrs].form
18651 = (enum dwarf_form) abbrev_form;
18652 cur_attrs[cur_abbrev->num_attrs].implicit_const = implicit_const;
18653 ++cur_abbrev->num_attrs;
18656 cur_abbrev->attrs =
18657 XOBNEWVEC (&abbrev_table->abbrev_obstack, struct attr_abbrev,
18658 cur_abbrev->num_attrs);
18659 memcpy (cur_abbrev->attrs, cur_attrs,
18660 cur_abbrev->num_attrs * sizeof (struct attr_abbrev));
18662 abbrev_table->add_abbrev (abbrev_number, cur_abbrev);
18664 /* Get next abbreviation.
18665 Under Irix6 the abbreviations for a compilation unit are not
18666 always properly terminated with an abbrev number of 0.
18667 Exit loop if we encounter an abbreviation which we have
18668 already read (which means we are about to read the abbreviations
18669 for the next compile unit) or if the end of the abbreviation
18670 table is reached. */
18671 if ((unsigned int) (abbrev_ptr - section->buffer) >= section->size)
18673 abbrev_number = read_unsigned_leb128 (abfd, abbrev_ptr, &bytes_read);
18674 abbrev_ptr += bytes_read;
18675 if (abbrev_table->lookup_abbrev (abbrev_number) != NULL)
18680 return abbrev_table;
18683 /* Returns nonzero if TAG represents a type that we might generate a partial
18687 is_type_tag_for_partial (int tag)
18692 /* Some types that would be reasonable to generate partial symbols for,
18693 that we don't at present. */
18694 case DW_TAG_array_type:
18695 case DW_TAG_file_type:
18696 case DW_TAG_ptr_to_member_type:
18697 case DW_TAG_set_type:
18698 case DW_TAG_string_type:
18699 case DW_TAG_subroutine_type:
18701 case DW_TAG_base_type:
18702 case DW_TAG_class_type:
18703 case DW_TAG_interface_type:
18704 case DW_TAG_enumeration_type:
18705 case DW_TAG_structure_type:
18706 case DW_TAG_subrange_type:
18707 case DW_TAG_typedef:
18708 case DW_TAG_union_type:
18715 /* Load all DIEs that are interesting for partial symbols into memory. */
18717 static struct partial_die_info *
18718 load_partial_dies (const struct die_reader_specs *reader,
18719 const gdb_byte *info_ptr, int building_psymtab)
18721 struct dwarf2_cu *cu = reader->cu;
18722 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
18723 struct partial_die_info *parent_die, *last_die, *first_die = NULL;
18724 unsigned int bytes_read;
18725 unsigned int load_all = 0;
18726 int nesting_level = 1;
18731 gdb_assert (cu->per_cu != NULL);
18732 if (cu->per_cu->load_all_dies)
18736 = htab_create_alloc_ex (cu->header.length / 12,
18740 &cu->comp_unit_obstack,
18741 hashtab_obstack_allocate,
18742 dummy_obstack_deallocate);
18746 abbrev_info *abbrev = peek_die_abbrev (*reader, info_ptr, &bytes_read);
18748 /* A NULL abbrev means the end of a series of children. */
18749 if (abbrev == NULL)
18751 if (--nesting_level == 0)
18754 info_ptr += bytes_read;
18755 last_die = parent_die;
18756 parent_die = parent_die->die_parent;
18760 /* Check for template arguments. We never save these; if
18761 they're seen, we just mark the parent, and go on our way. */
18762 if (parent_die != NULL
18763 && cu->language == language_cplus
18764 && (abbrev->tag == DW_TAG_template_type_param
18765 || abbrev->tag == DW_TAG_template_value_param))
18767 parent_die->has_template_arguments = 1;
18771 /* We don't need a partial DIE for the template argument. */
18772 info_ptr = skip_one_die (reader, info_ptr + bytes_read, abbrev);
18777 /* We only recurse into c++ subprograms looking for template arguments.
18778 Skip their other children. */
18780 && cu->language == language_cplus
18781 && parent_die != NULL
18782 && parent_die->tag == DW_TAG_subprogram)
18784 info_ptr = skip_one_die (reader, info_ptr + bytes_read, abbrev);
18788 /* Check whether this DIE is interesting enough to save. Normally
18789 we would not be interested in members here, but there may be
18790 later variables referencing them via DW_AT_specification (for
18791 static members). */
18793 && !is_type_tag_for_partial (abbrev->tag)
18794 && abbrev->tag != DW_TAG_constant
18795 && abbrev->tag != DW_TAG_enumerator
18796 && abbrev->tag != DW_TAG_subprogram
18797 && abbrev->tag != DW_TAG_inlined_subroutine
18798 && abbrev->tag != DW_TAG_lexical_block
18799 && abbrev->tag != DW_TAG_variable
18800 && abbrev->tag != DW_TAG_namespace
18801 && abbrev->tag != DW_TAG_module
18802 && abbrev->tag != DW_TAG_member
18803 && abbrev->tag != DW_TAG_imported_unit
18804 && abbrev->tag != DW_TAG_imported_declaration)
18806 /* Otherwise we skip to the next sibling, if any. */
18807 info_ptr = skip_one_die (reader, info_ptr + bytes_read, abbrev);
18811 struct partial_die_info pdi ((sect_offset) (info_ptr - reader->buffer),
18814 info_ptr = pdi.read (reader, *abbrev, info_ptr + bytes_read);
18816 /* This two-pass algorithm for processing partial symbols has a
18817 high cost in cache pressure. Thus, handle some simple cases
18818 here which cover the majority of C partial symbols. DIEs
18819 which neither have specification tags in them, nor could have
18820 specification tags elsewhere pointing at them, can simply be
18821 processed and discarded.
18823 This segment is also optional; scan_partial_symbols and
18824 add_partial_symbol will handle these DIEs if we chain
18825 them in normally. When compilers which do not emit large
18826 quantities of duplicate debug information are more common,
18827 this code can probably be removed. */
18829 /* Any complete simple types at the top level (pretty much all
18830 of them, for a language without namespaces), can be processed
18832 if (parent_die == NULL
18833 && pdi.has_specification == 0
18834 && pdi.is_declaration == 0
18835 && ((pdi.tag == DW_TAG_typedef && !pdi.has_children)
18836 || pdi.tag == DW_TAG_base_type
18837 || pdi.tag == DW_TAG_subrange_type))
18839 if (building_psymtab && pdi.name != NULL)
18840 add_psymbol_to_list (pdi.name, strlen (pdi.name), 0,
18841 VAR_DOMAIN, LOC_TYPEDEF,
18842 &objfile->static_psymbols,
18843 0, cu->language, objfile);
18844 info_ptr = locate_pdi_sibling (reader, &pdi, info_ptr);
18848 /* The exception for DW_TAG_typedef with has_children above is
18849 a workaround of GCC PR debug/47510. In the case of this complaint
18850 type_name_no_tag_or_error will error on such types later.
18852 GDB skipped children of DW_TAG_typedef by the shortcut above and then
18853 it could not find the child DIEs referenced later, this is checked
18854 above. In correct DWARF DW_TAG_typedef should have no children. */
18856 if (pdi.tag == DW_TAG_typedef && pdi.has_children)
18857 complaint (&symfile_complaints,
18858 _("DW_TAG_typedef has childen - GCC PR debug/47510 bug "
18859 "- DIE at %s [in module %s]"),
18860 sect_offset_str (pdi.sect_off), objfile_name (objfile));
18862 /* If we're at the second level, and we're an enumerator, and
18863 our parent has no specification (meaning possibly lives in a
18864 namespace elsewhere), then we can add the partial symbol now
18865 instead of queueing it. */
18866 if (pdi.tag == DW_TAG_enumerator
18867 && parent_die != NULL
18868 && parent_die->die_parent == NULL
18869 && parent_die->tag == DW_TAG_enumeration_type
18870 && parent_die->has_specification == 0)
18872 if (pdi.name == NULL)
18873 complaint (&symfile_complaints,
18874 _("malformed enumerator DIE ignored"));
18875 else if (building_psymtab)
18876 add_psymbol_to_list (pdi.name, strlen (pdi.name), 0,
18877 VAR_DOMAIN, LOC_CONST,
18878 cu->language == language_cplus
18879 ? &objfile->global_psymbols
18880 : &objfile->static_psymbols,
18881 0, cu->language, objfile);
18883 info_ptr = locate_pdi_sibling (reader, &pdi, info_ptr);
18887 struct partial_die_info *part_die
18888 = new (&cu->comp_unit_obstack) partial_die_info (pdi);
18890 /* We'll save this DIE so link it in. */
18891 part_die->die_parent = parent_die;
18892 part_die->die_sibling = NULL;
18893 part_die->die_child = NULL;
18895 if (last_die && last_die == parent_die)
18896 last_die->die_child = part_die;
18898 last_die->die_sibling = part_die;
18900 last_die = part_die;
18902 if (first_die == NULL)
18903 first_die = part_die;
18905 /* Maybe add the DIE to the hash table. Not all DIEs that we
18906 find interesting need to be in the hash table, because we
18907 also have the parent/sibling/child chains; only those that we
18908 might refer to by offset later during partial symbol reading.
18910 For now this means things that might have be the target of a
18911 DW_AT_specification, DW_AT_abstract_origin, or
18912 DW_AT_extension. DW_AT_extension will refer only to
18913 namespaces; DW_AT_abstract_origin refers to functions (and
18914 many things under the function DIE, but we do not recurse
18915 into function DIEs during partial symbol reading) and
18916 possibly variables as well; DW_AT_specification refers to
18917 declarations. Declarations ought to have the DW_AT_declaration
18918 flag. It happens that GCC forgets to put it in sometimes, but
18919 only for functions, not for types.
18921 Adding more things than necessary to the hash table is harmless
18922 except for the performance cost. Adding too few will result in
18923 wasted time in find_partial_die, when we reread the compilation
18924 unit with load_all_dies set. */
18927 || abbrev->tag == DW_TAG_constant
18928 || abbrev->tag == DW_TAG_subprogram
18929 || abbrev->tag == DW_TAG_variable
18930 || abbrev->tag == DW_TAG_namespace
18931 || part_die->is_declaration)
18935 slot = htab_find_slot_with_hash (cu->partial_dies, part_die,
18936 to_underlying (part_die->sect_off),
18941 /* For some DIEs we want to follow their children (if any). For C
18942 we have no reason to follow the children of structures; for other
18943 languages we have to, so that we can get at method physnames
18944 to infer fully qualified class names, for DW_AT_specification,
18945 and for C++ template arguments. For C++, we also look one level
18946 inside functions to find template arguments (if the name of the
18947 function does not already contain the template arguments).
18949 For Ada, we need to scan the children of subprograms and lexical
18950 blocks as well because Ada allows the definition of nested
18951 entities that could be interesting for the debugger, such as
18952 nested subprograms for instance. */
18953 if (last_die->has_children
18955 || last_die->tag == DW_TAG_namespace
18956 || last_die->tag == DW_TAG_module
18957 || last_die->tag == DW_TAG_enumeration_type
18958 || (cu->language == language_cplus
18959 && last_die->tag == DW_TAG_subprogram
18960 && (last_die->name == NULL
18961 || strchr (last_die->name, '<') == NULL))
18962 || (cu->language != language_c
18963 && (last_die->tag == DW_TAG_class_type
18964 || last_die->tag == DW_TAG_interface_type
18965 || last_die->tag == DW_TAG_structure_type
18966 || last_die->tag == DW_TAG_union_type))
18967 || (cu->language == language_ada
18968 && (last_die->tag == DW_TAG_subprogram
18969 || last_die->tag == DW_TAG_lexical_block))))
18972 parent_die = last_die;
18976 /* Otherwise we skip to the next sibling, if any. */
18977 info_ptr = locate_pdi_sibling (reader, last_die, info_ptr);
18979 /* Back to the top, do it again. */
18983 partial_die_info::partial_die_info (sect_offset sect_off_,
18984 struct abbrev_info *abbrev)
18985 : partial_die_info (sect_off_, abbrev->tag, abbrev->has_children)
18989 /* Read a minimal amount of information into the minimal die structure.
18990 INFO_PTR should point just after the initial uleb128 of a DIE. */
18993 partial_die_info::read (const struct die_reader_specs *reader,
18994 const struct abbrev_info &abbrev, const gdb_byte *info_ptr)
18996 struct dwarf2_cu *cu = reader->cu;
18997 struct dwarf2_per_objfile *dwarf2_per_objfile
18998 = cu->per_cu->dwarf2_per_objfile;
19000 int has_low_pc_attr = 0;
19001 int has_high_pc_attr = 0;
19002 int high_pc_relative = 0;
19004 for (i = 0; i < abbrev.num_attrs; ++i)
19006 struct attribute attr;
19008 info_ptr = read_attribute (reader, &attr, &abbrev.attrs[i], info_ptr);
19010 /* Store the data if it is of an attribute we want to keep in a
19011 partial symbol table. */
19017 case DW_TAG_compile_unit:
19018 case DW_TAG_partial_unit:
19019 case DW_TAG_type_unit:
19020 /* Compilation units have a DW_AT_name that is a filename, not
19021 a source language identifier. */
19022 case DW_TAG_enumeration_type:
19023 case DW_TAG_enumerator:
19024 /* These tags always have simple identifiers already; no need
19025 to canonicalize them. */
19026 name = DW_STRING (&attr);
19030 struct objfile *objfile = dwarf2_per_objfile->objfile;
19033 = dwarf2_canonicalize_name (DW_STRING (&attr), cu,
19034 &objfile->per_bfd->storage_obstack);
19039 case DW_AT_linkage_name:
19040 case DW_AT_MIPS_linkage_name:
19041 /* Note that both forms of linkage name might appear. We
19042 assume they will be the same, and we only store the last
19044 if (cu->language == language_ada)
19045 name = DW_STRING (&attr);
19046 linkage_name = DW_STRING (&attr);
19049 has_low_pc_attr = 1;
19050 lowpc = attr_value_as_address (&attr);
19052 case DW_AT_high_pc:
19053 has_high_pc_attr = 1;
19054 highpc = attr_value_as_address (&attr);
19055 if (cu->header.version >= 4 && attr_form_is_constant (&attr))
19056 high_pc_relative = 1;
19058 case DW_AT_location:
19059 /* Support the .debug_loc offsets. */
19060 if (attr_form_is_block (&attr))
19062 d.locdesc = DW_BLOCK (&attr);
19064 else if (attr_form_is_section_offset (&attr))
19066 dwarf2_complex_location_expr_complaint ();
19070 dwarf2_invalid_attrib_class_complaint ("DW_AT_location",
19071 "partial symbol information");
19074 case DW_AT_external:
19075 is_external = DW_UNSND (&attr);
19077 case DW_AT_declaration:
19078 is_declaration = DW_UNSND (&attr);
19083 case DW_AT_abstract_origin:
19084 case DW_AT_specification:
19085 case DW_AT_extension:
19086 has_specification = 1;
19087 spec_offset = dwarf2_get_ref_die_offset (&attr);
19088 spec_is_dwz = (attr.form == DW_FORM_GNU_ref_alt
19089 || cu->per_cu->is_dwz);
19091 case DW_AT_sibling:
19092 /* Ignore absolute siblings, they might point outside of
19093 the current compile unit. */
19094 if (attr.form == DW_FORM_ref_addr)
19095 complaint (&symfile_complaints,
19096 _("ignoring absolute DW_AT_sibling"));
19099 const gdb_byte *buffer = reader->buffer;
19100 sect_offset off = dwarf2_get_ref_die_offset (&attr);
19101 const gdb_byte *sibling_ptr = buffer + to_underlying (off);
19103 if (sibling_ptr < info_ptr)
19104 complaint (&symfile_complaints,
19105 _("DW_AT_sibling points backwards"));
19106 else if (sibling_ptr > reader->buffer_end)
19107 dwarf2_section_buffer_overflow_complaint (reader->die_section);
19109 sibling = sibling_ptr;
19112 case DW_AT_byte_size:
19115 case DW_AT_const_value:
19116 has_const_value = 1;
19118 case DW_AT_calling_convention:
19119 /* DWARF doesn't provide a way to identify a program's source-level
19120 entry point. DW_AT_calling_convention attributes are only meant
19121 to describe functions' calling conventions.
19123 However, because it's a necessary piece of information in
19124 Fortran, and before DWARF 4 DW_CC_program was the only
19125 piece of debugging information whose definition refers to
19126 a 'main program' at all, several compilers marked Fortran
19127 main programs with DW_CC_program --- even when those
19128 functions use the standard calling conventions.
19130 Although DWARF now specifies a way to provide this
19131 information, we support this practice for backward
19133 if (DW_UNSND (&attr) == DW_CC_program
19134 && cu->language == language_fortran)
19135 main_subprogram = 1;
19138 if (DW_UNSND (&attr) == DW_INL_inlined
19139 || DW_UNSND (&attr) == DW_INL_declared_inlined)
19140 may_be_inlined = 1;
19144 if (tag == DW_TAG_imported_unit)
19146 d.sect_off = dwarf2_get_ref_die_offset (&attr);
19147 is_dwz = (attr.form == DW_FORM_GNU_ref_alt
19148 || cu->per_cu->is_dwz);
19152 case DW_AT_main_subprogram:
19153 main_subprogram = DW_UNSND (&attr);
19161 if (high_pc_relative)
19164 if (has_low_pc_attr && has_high_pc_attr)
19166 /* When using the GNU linker, .gnu.linkonce. sections are used to
19167 eliminate duplicate copies of functions and vtables and such.
19168 The linker will arbitrarily choose one and discard the others.
19169 The AT_*_pc values for such functions refer to local labels in
19170 these sections. If the section from that file was discarded, the
19171 labels are not in the output, so the relocs get a value of 0.
19172 If this is a discarded function, mark the pc bounds as invalid,
19173 so that GDB will ignore it. */
19174 if (lowpc == 0 && !dwarf2_per_objfile->has_section_at_zero)
19176 struct objfile *objfile = dwarf2_per_objfile->objfile;
19177 struct gdbarch *gdbarch = get_objfile_arch (objfile);
19179 complaint (&symfile_complaints,
19180 _("DW_AT_low_pc %s is zero "
19181 "for DIE at %s [in module %s]"),
19182 paddress (gdbarch, lowpc),
19183 sect_offset_str (sect_off),
19184 objfile_name (objfile));
19186 /* dwarf2_get_pc_bounds has also the strict low < high requirement. */
19187 else if (lowpc >= highpc)
19189 struct objfile *objfile = dwarf2_per_objfile->objfile;
19190 struct gdbarch *gdbarch = get_objfile_arch (objfile);
19192 complaint (&symfile_complaints,
19193 _("DW_AT_low_pc %s is not < DW_AT_high_pc %s "
19194 "for DIE at %s [in module %s]"),
19195 paddress (gdbarch, lowpc),
19196 paddress (gdbarch, highpc),
19197 sect_offset_str (sect_off),
19198 objfile_name (objfile));
19207 /* Find a cached partial DIE at OFFSET in CU. */
19209 struct partial_die_info *
19210 dwarf2_cu::find_partial_die (sect_offset sect_off)
19212 struct partial_die_info *lookup_die = NULL;
19213 struct partial_die_info part_die (sect_off);
19215 lookup_die = ((struct partial_die_info *)
19216 htab_find_with_hash (partial_dies, &part_die,
19217 to_underlying (sect_off)));
19222 /* Find a partial DIE at OFFSET, which may or may not be in CU,
19223 except in the case of .debug_types DIEs which do not reference
19224 outside their CU (they do however referencing other types via
19225 DW_FORM_ref_sig8). */
19227 static struct partial_die_info *
19228 find_partial_die (sect_offset sect_off, int offset_in_dwz, struct dwarf2_cu *cu)
19230 struct dwarf2_per_objfile *dwarf2_per_objfile
19231 = cu->per_cu->dwarf2_per_objfile;
19232 struct objfile *objfile = dwarf2_per_objfile->objfile;
19233 struct dwarf2_per_cu_data *per_cu = NULL;
19234 struct partial_die_info *pd = NULL;
19236 if (offset_in_dwz == cu->per_cu->is_dwz
19237 && offset_in_cu_p (&cu->header, sect_off))
19239 pd = cu->find_partial_die (sect_off);
19242 /* We missed recording what we needed.
19243 Load all dies and try again. */
19244 per_cu = cu->per_cu;
19248 /* TUs don't reference other CUs/TUs (except via type signatures). */
19249 if (cu->per_cu->is_debug_types)
19251 error (_("Dwarf Error: Type Unit at offset %s contains"
19252 " external reference to offset %s [in module %s].\n"),
19253 sect_offset_str (cu->header.sect_off), sect_offset_str (sect_off),
19254 bfd_get_filename (objfile->obfd));
19256 per_cu = dwarf2_find_containing_comp_unit (sect_off, offset_in_dwz,
19257 dwarf2_per_objfile);
19259 if (per_cu->cu == NULL || per_cu->cu->partial_dies == NULL)
19260 load_partial_comp_unit (per_cu);
19262 per_cu->cu->last_used = 0;
19263 pd = per_cu->cu->find_partial_die (sect_off);
19266 /* If we didn't find it, and not all dies have been loaded,
19267 load them all and try again. */
19269 if (pd == NULL && per_cu->load_all_dies == 0)
19271 per_cu->load_all_dies = 1;
19273 /* This is nasty. When we reread the DIEs, somewhere up the call chain
19274 THIS_CU->cu may already be in use. So we can't just free it and
19275 replace its DIEs with the ones we read in. Instead, we leave those
19276 DIEs alone (which can still be in use, e.g. in scan_partial_symbols),
19277 and clobber THIS_CU->cu->partial_dies with the hash table for the new
19279 load_partial_comp_unit (per_cu);
19281 pd = per_cu->cu->find_partial_die (sect_off);
19285 internal_error (__FILE__, __LINE__,
19286 _("could not find partial DIE %s "
19287 "in cache [from module %s]\n"),
19288 sect_offset_str (sect_off), bfd_get_filename (objfile->obfd));
19292 /* See if we can figure out if the class lives in a namespace. We do
19293 this by looking for a member function; its demangled name will
19294 contain namespace info, if there is any. */
19297 guess_partial_die_structure_name (struct partial_die_info *struct_pdi,
19298 struct dwarf2_cu *cu)
19300 /* NOTE: carlton/2003-10-07: Getting the info this way changes
19301 what template types look like, because the demangler
19302 frequently doesn't give the same name as the debug info. We
19303 could fix this by only using the demangled name to get the
19304 prefix (but see comment in read_structure_type). */
19306 struct partial_die_info *real_pdi;
19307 struct partial_die_info *child_pdi;
19309 /* If this DIE (this DIE's specification, if any) has a parent, then
19310 we should not do this. We'll prepend the parent's fully qualified
19311 name when we create the partial symbol. */
19313 real_pdi = struct_pdi;
19314 while (real_pdi->has_specification)
19315 real_pdi = find_partial_die (real_pdi->spec_offset,
19316 real_pdi->spec_is_dwz, cu);
19318 if (real_pdi->die_parent != NULL)
19321 for (child_pdi = struct_pdi->die_child;
19323 child_pdi = child_pdi->die_sibling)
19325 if (child_pdi->tag == DW_TAG_subprogram
19326 && child_pdi->linkage_name != NULL)
19328 char *actual_class_name
19329 = language_class_name_from_physname (cu->language_defn,
19330 child_pdi->linkage_name);
19331 if (actual_class_name != NULL)
19333 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
19336 obstack_copy0 (&objfile->per_bfd->storage_obstack,
19338 strlen (actual_class_name)));
19339 xfree (actual_class_name);
19347 partial_die_info::fixup (struct dwarf2_cu *cu)
19349 /* Once we've fixed up a die, there's no point in doing so again.
19350 This also avoids a memory leak if we were to call
19351 guess_partial_die_structure_name multiple times. */
19355 /* If we found a reference attribute and the DIE has no name, try
19356 to find a name in the referred to DIE. */
19358 if (name == NULL && has_specification)
19360 struct partial_die_info *spec_die;
19362 spec_die = find_partial_die (spec_offset, spec_is_dwz, cu);
19364 spec_die->fixup (cu);
19366 if (spec_die->name)
19368 name = spec_die->name;
19370 /* Copy DW_AT_external attribute if it is set. */
19371 if (spec_die->is_external)
19372 is_external = spec_die->is_external;
19376 /* Set default names for some unnamed DIEs. */
19378 if (name == NULL && tag == DW_TAG_namespace)
19379 name = CP_ANONYMOUS_NAMESPACE_STR;
19381 /* If there is no parent die to provide a namespace, and there are
19382 children, see if we can determine the namespace from their linkage
19384 if (cu->language == language_cplus
19385 && !VEC_empty (dwarf2_section_info_def,
19386 cu->per_cu->dwarf2_per_objfile->types)
19387 && die_parent == NULL
19389 && (tag == DW_TAG_class_type
19390 || tag == DW_TAG_structure_type
19391 || tag == DW_TAG_union_type))
19392 guess_partial_die_structure_name (this, cu);
19394 /* GCC might emit a nameless struct or union that has a linkage
19395 name. See http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47510. */
19397 && (tag == DW_TAG_class_type
19398 || tag == DW_TAG_interface_type
19399 || tag == DW_TAG_structure_type
19400 || tag == DW_TAG_union_type)
19401 && linkage_name != NULL)
19405 demangled = gdb_demangle (linkage_name, DMGL_TYPES);
19410 /* Strip any leading namespaces/classes, keep only the base name.
19411 DW_AT_name for named DIEs does not contain the prefixes. */
19412 base = strrchr (demangled, ':');
19413 if (base && base > demangled && base[-1] == ':')
19418 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
19421 obstack_copy0 (&objfile->per_bfd->storage_obstack,
19422 base, strlen (base)));
19430 /* Read an attribute value described by an attribute form. */
19432 static const gdb_byte *
19433 read_attribute_value (const struct die_reader_specs *reader,
19434 struct attribute *attr, unsigned form,
19435 LONGEST implicit_const, const gdb_byte *info_ptr)
19437 struct dwarf2_cu *cu = reader->cu;
19438 struct dwarf2_per_objfile *dwarf2_per_objfile
19439 = cu->per_cu->dwarf2_per_objfile;
19440 struct objfile *objfile = dwarf2_per_objfile->objfile;
19441 struct gdbarch *gdbarch = get_objfile_arch (objfile);
19442 bfd *abfd = reader->abfd;
19443 struct comp_unit_head *cu_header = &cu->header;
19444 unsigned int bytes_read;
19445 struct dwarf_block *blk;
19447 attr->form = (enum dwarf_form) form;
19450 case DW_FORM_ref_addr:
19451 if (cu->header.version == 2)
19452 DW_UNSND (attr) = read_address (abfd, info_ptr, cu, &bytes_read);
19454 DW_UNSND (attr) = read_offset (abfd, info_ptr,
19455 &cu->header, &bytes_read);
19456 info_ptr += bytes_read;
19458 case DW_FORM_GNU_ref_alt:
19459 DW_UNSND (attr) = read_offset (abfd, info_ptr, &cu->header, &bytes_read);
19460 info_ptr += bytes_read;
19463 DW_ADDR (attr) = read_address (abfd, info_ptr, cu, &bytes_read);
19464 DW_ADDR (attr) = gdbarch_adjust_dwarf2_addr (gdbarch, DW_ADDR (attr));
19465 info_ptr += bytes_read;
19467 case DW_FORM_block2:
19468 blk = dwarf_alloc_block (cu);
19469 blk->size = read_2_bytes (abfd, info_ptr);
19471 blk->data = read_n_bytes (abfd, info_ptr, blk->size);
19472 info_ptr += blk->size;
19473 DW_BLOCK (attr) = blk;
19475 case DW_FORM_block4:
19476 blk = dwarf_alloc_block (cu);
19477 blk->size = read_4_bytes (abfd, info_ptr);
19479 blk->data = read_n_bytes (abfd, info_ptr, blk->size);
19480 info_ptr += blk->size;
19481 DW_BLOCK (attr) = blk;
19483 case DW_FORM_data2:
19484 DW_UNSND (attr) = read_2_bytes (abfd, info_ptr);
19487 case DW_FORM_data4:
19488 DW_UNSND (attr) = read_4_bytes (abfd, info_ptr);
19491 case DW_FORM_data8:
19492 DW_UNSND (attr) = read_8_bytes (abfd, info_ptr);
19495 case DW_FORM_data16:
19496 blk = dwarf_alloc_block (cu);
19498 blk->data = read_n_bytes (abfd, info_ptr, 16);
19500 DW_BLOCK (attr) = blk;
19502 case DW_FORM_sec_offset:
19503 DW_UNSND (attr) = read_offset (abfd, info_ptr, &cu->header, &bytes_read);
19504 info_ptr += bytes_read;
19506 case DW_FORM_string:
19507 DW_STRING (attr) = read_direct_string (abfd, info_ptr, &bytes_read);
19508 DW_STRING_IS_CANONICAL (attr) = 0;
19509 info_ptr += bytes_read;
19512 if (!cu->per_cu->is_dwz)
19514 DW_STRING (attr) = read_indirect_string (dwarf2_per_objfile,
19515 abfd, info_ptr, cu_header,
19517 DW_STRING_IS_CANONICAL (attr) = 0;
19518 info_ptr += bytes_read;
19522 case DW_FORM_line_strp:
19523 if (!cu->per_cu->is_dwz)
19525 DW_STRING (attr) = read_indirect_line_string (dwarf2_per_objfile,
19527 cu_header, &bytes_read);
19528 DW_STRING_IS_CANONICAL (attr) = 0;
19529 info_ptr += bytes_read;
19533 case DW_FORM_GNU_strp_alt:
19535 struct dwz_file *dwz = dwarf2_get_dwz_file (dwarf2_per_objfile);
19536 LONGEST str_offset = read_offset (abfd, info_ptr, cu_header,
19539 DW_STRING (attr) = read_indirect_string_from_dwz (objfile,
19541 DW_STRING_IS_CANONICAL (attr) = 0;
19542 info_ptr += bytes_read;
19545 case DW_FORM_exprloc:
19546 case DW_FORM_block:
19547 blk = dwarf_alloc_block (cu);
19548 blk->size = read_unsigned_leb128 (abfd, info_ptr, &bytes_read);
19549 info_ptr += bytes_read;
19550 blk->data = read_n_bytes (abfd, info_ptr, blk->size);
19551 info_ptr += blk->size;
19552 DW_BLOCK (attr) = blk;
19554 case DW_FORM_block1:
19555 blk = dwarf_alloc_block (cu);
19556 blk->size = read_1_byte (abfd, info_ptr);
19558 blk->data = read_n_bytes (abfd, info_ptr, blk->size);
19559 info_ptr += blk->size;
19560 DW_BLOCK (attr) = blk;
19562 case DW_FORM_data1:
19563 DW_UNSND (attr) = read_1_byte (abfd, info_ptr);
19567 DW_UNSND (attr) = read_1_byte (abfd, info_ptr);
19570 case DW_FORM_flag_present:
19571 DW_UNSND (attr) = 1;
19573 case DW_FORM_sdata:
19574 DW_SND (attr) = read_signed_leb128 (abfd, info_ptr, &bytes_read);
19575 info_ptr += bytes_read;
19577 case DW_FORM_udata:
19578 DW_UNSND (attr) = read_unsigned_leb128 (abfd, info_ptr, &bytes_read);
19579 info_ptr += bytes_read;
19582 DW_UNSND (attr) = (to_underlying (cu->header.sect_off)
19583 + read_1_byte (abfd, info_ptr));
19587 DW_UNSND (attr) = (to_underlying (cu->header.sect_off)
19588 + read_2_bytes (abfd, info_ptr));
19592 DW_UNSND (attr) = (to_underlying (cu->header.sect_off)
19593 + read_4_bytes (abfd, info_ptr));
19597 DW_UNSND (attr) = (to_underlying (cu->header.sect_off)
19598 + read_8_bytes (abfd, info_ptr));
19601 case DW_FORM_ref_sig8:
19602 DW_SIGNATURE (attr) = read_8_bytes (abfd, info_ptr);
19605 case DW_FORM_ref_udata:
19606 DW_UNSND (attr) = (to_underlying (cu->header.sect_off)
19607 + read_unsigned_leb128 (abfd, info_ptr, &bytes_read));
19608 info_ptr += bytes_read;
19610 case DW_FORM_indirect:
19611 form = read_unsigned_leb128 (abfd, info_ptr, &bytes_read);
19612 info_ptr += bytes_read;
19613 if (form == DW_FORM_implicit_const)
19615 implicit_const = read_signed_leb128 (abfd, info_ptr, &bytes_read);
19616 info_ptr += bytes_read;
19618 info_ptr = read_attribute_value (reader, attr, form, implicit_const,
19621 case DW_FORM_implicit_const:
19622 DW_SND (attr) = implicit_const;
19624 case DW_FORM_GNU_addr_index:
19625 if (reader->dwo_file == NULL)
19627 /* For now flag a hard error.
19628 Later we can turn this into a complaint. */
19629 error (_("Dwarf Error: %s found in non-DWO CU [in module %s]"),
19630 dwarf_form_name (form),
19631 bfd_get_filename (abfd));
19633 DW_ADDR (attr) = read_addr_index_from_leb128 (cu, info_ptr, &bytes_read);
19634 info_ptr += bytes_read;
19636 case DW_FORM_GNU_str_index:
19637 if (reader->dwo_file == NULL)
19639 /* For now flag a hard error.
19640 Later we can turn this into a complaint if warranted. */
19641 error (_("Dwarf Error: %s found in non-DWO CU [in module %s]"),
19642 dwarf_form_name (form),
19643 bfd_get_filename (abfd));
19646 ULONGEST str_index =
19647 read_unsigned_leb128 (abfd, info_ptr, &bytes_read);
19649 DW_STRING (attr) = read_str_index (reader, str_index);
19650 DW_STRING_IS_CANONICAL (attr) = 0;
19651 info_ptr += bytes_read;
19655 error (_("Dwarf Error: Cannot handle %s in DWARF reader [in module %s]"),
19656 dwarf_form_name (form),
19657 bfd_get_filename (abfd));
19661 if (cu->per_cu->is_dwz && attr_form_is_ref (attr))
19662 attr->form = DW_FORM_GNU_ref_alt;
19664 /* We have seen instances where the compiler tried to emit a byte
19665 size attribute of -1 which ended up being encoded as an unsigned
19666 0xffffffff. Although 0xffffffff is technically a valid size value,
19667 an object of this size seems pretty unlikely so we can relatively
19668 safely treat these cases as if the size attribute was invalid and
19669 treat them as zero by default. */
19670 if (attr->name == DW_AT_byte_size
19671 && form == DW_FORM_data4
19672 && DW_UNSND (attr) >= 0xffffffff)
19675 (&symfile_complaints,
19676 _("Suspicious DW_AT_byte_size value treated as zero instead of %s"),
19677 hex_string (DW_UNSND (attr)));
19678 DW_UNSND (attr) = 0;
19684 /* Read an attribute described by an abbreviated attribute. */
19686 static const gdb_byte *
19687 read_attribute (const struct die_reader_specs *reader,
19688 struct attribute *attr, struct attr_abbrev *abbrev,
19689 const gdb_byte *info_ptr)
19691 attr->name = abbrev->name;
19692 return read_attribute_value (reader, attr, abbrev->form,
19693 abbrev->implicit_const, info_ptr);
19696 /* Read dwarf information from a buffer. */
19698 static unsigned int
19699 read_1_byte (bfd *abfd, const gdb_byte *buf)
19701 return bfd_get_8 (abfd, buf);
19705 read_1_signed_byte (bfd *abfd, const gdb_byte *buf)
19707 return bfd_get_signed_8 (abfd, buf);
19710 static unsigned int
19711 read_2_bytes (bfd *abfd, const gdb_byte *buf)
19713 return bfd_get_16 (abfd, buf);
19717 read_2_signed_bytes (bfd *abfd, const gdb_byte *buf)
19719 return bfd_get_signed_16 (abfd, buf);
19722 static unsigned int
19723 read_4_bytes (bfd *abfd, const gdb_byte *buf)
19725 return bfd_get_32 (abfd, buf);
19729 read_4_signed_bytes (bfd *abfd, const gdb_byte *buf)
19731 return bfd_get_signed_32 (abfd, buf);
19735 read_8_bytes (bfd *abfd, const gdb_byte *buf)
19737 return bfd_get_64 (abfd, buf);
19741 read_address (bfd *abfd, const gdb_byte *buf, struct dwarf2_cu *cu,
19742 unsigned int *bytes_read)
19744 struct comp_unit_head *cu_header = &cu->header;
19745 CORE_ADDR retval = 0;
19747 if (cu_header->signed_addr_p)
19749 switch (cu_header->addr_size)
19752 retval = bfd_get_signed_16 (abfd, buf);
19755 retval = bfd_get_signed_32 (abfd, buf);
19758 retval = bfd_get_signed_64 (abfd, buf);
19761 internal_error (__FILE__, __LINE__,
19762 _("read_address: bad switch, signed [in module %s]"),
19763 bfd_get_filename (abfd));
19768 switch (cu_header->addr_size)
19771 retval = bfd_get_16 (abfd, buf);
19774 retval = bfd_get_32 (abfd, buf);
19777 retval = bfd_get_64 (abfd, buf);
19780 internal_error (__FILE__, __LINE__,
19781 _("read_address: bad switch, "
19782 "unsigned [in module %s]"),
19783 bfd_get_filename (abfd));
19787 *bytes_read = cu_header->addr_size;
19791 /* Read the initial length from a section. The (draft) DWARF 3
19792 specification allows the initial length to take up either 4 bytes
19793 or 12 bytes. If the first 4 bytes are 0xffffffff, then the next 8
19794 bytes describe the length and all offsets will be 8 bytes in length
19797 An older, non-standard 64-bit format is also handled by this
19798 function. The older format in question stores the initial length
19799 as an 8-byte quantity without an escape value. Lengths greater
19800 than 2^32 aren't very common which means that the initial 4 bytes
19801 is almost always zero. Since a length value of zero doesn't make
19802 sense for the 32-bit format, this initial zero can be considered to
19803 be an escape value which indicates the presence of the older 64-bit
19804 format. As written, the code can't detect (old format) lengths
19805 greater than 4GB. If it becomes necessary to handle lengths
19806 somewhat larger than 4GB, we could allow other small values (such
19807 as the non-sensical values of 1, 2, and 3) to also be used as
19808 escape values indicating the presence of the old format.
19810 The value returned via bytes_read should be used to increment the
19811 relevant pointer after calling read_initial_length().
19813 [ Note: read_initial_length() and read_offset() are based on the
19814 document entitled "DWARF Debugging Information Format", revision
19815 3, draft 8, dated November 19, 2001. This document was obtained
19818 http://reality.sgiweb.org/davea/dwarf3-draft8-011125.pdf
19820 This document is only a draft and is subject to change. (So beware.)
19822 Details regarding the older, non-standard 64-bit format were
19823 determined empirically by examining 64-bit ELF files produced by
19824 the SGI toolchain on an IRIX 6.5 machine.
19826 - Kevin, July 16, 2002
19830 read_initial_length (bfd *abfd, const gdb_byte *buf, unsigned int *bytes_read)
19832 LONGEST length = bfd_get_32 (abfd, buf);
19834 if (length == 0xffffffff)
19836 length = bfd_get_64 (abfd, buf + 4);
19839 else if (length == 0)
19841 /* Handle the (non-standard) 64-bit DWARF2 format used by IRIX. */
19842 length = bfd_get_64 (abfd, buf);
19853 /* Cover function for read_initial_length.
19854 Returns the length of the object at BUF, and stores the size of the
19855 initial length in *BYTES_READ and stores the size that offsets will be in
19857 If the initial length size is not equivalent to that specified in
19858 CU_HEADER then issue a complaint.
19859 This is useful when reading non-comp-unit headers. */
19862 read_checked_initial_length_and_offset (bfd *abfd, const gdb_byte *buf,
19863 const struct comp_unit_head *cu_header,
19864 unsigned int *bytes_read,
19865 unsigned int *offset_size)
19867 LONGEST length = read_initial_length (abfd, buf, bytes_read);
19869 gdb_assert (cu_header->initial_length_size == 4
19870 || cu_header->initial_length_size == 8
19871 || cu_header->initial_length_size == 12);
19873 if (cu_header->initial_length_size != *bytes_read)
19874 complaint (&symfile_complaints,
19875 _("intermixed 32-bit and 64-bit DWARF sections"));
19877 *offset_size = (*bytes_read == 4) ? 4 : 8;
19881 /* Read an offset from the data stream. The size of the offset is
19882 given by cu_header->offset_size. */
19885 read_offset (bfd *abfd, const gdb_byte *buf,
19886 const struct comp_unit_head *cu_header,
19887 unsigned int *bytes_read)
19889 LONGEST offset = read_offset_1 (abfd, buf, cu_header->offset_size);
19891 *bytes_read = cu_header->offset_size;
19895 /* Read an offset from the data stream. */
19898 read_offset_1 (bfd *abfd, const gdb_byte *buf, unsigned int offset_size)
19900 LONGEST retval = 0;
19902 switch (offset_size)
19905 retval = bfd_get_32 (abfd, buf);
19908 retval = bfd_get_64 (abfd, buf);
19911 internal_error (__FILE__, __LINE__,
19912 _("read_offset_1: bad switch [in module %s]"),
19913 bfd_get_filename (abfd));
19919 static const gdb_byte *
19920 read_n_bytes (bfd *abfd, const gdb_byte *buf, unsigned int size)
19922 /* If the size of a host char is 8 bits, we can return a pointer
19923 to the buffer, otherwise we have to copy the data to a buffer
19924 allocated on the temporary obstack. */
19925 gdb_assert (HOST_CHAR_BIT == 8);
19929 static const char *
19930 read_direct_string (bfd *abfd, const gdb_byte *buf,
19931 unsigned int *bytes_read_ptr)
19933 /* If the size of a host char is 8 bits, we can return a pointer
19934 to the string, otherwise we have to copy the string to a buffer
19935 allocated on the temporary obstack. */
19936 gdb_assert (HOST_CHAR_BIT == 8);
19939 *bytes_read_ptr = 1;
19942 *bytes_read_ptr = strlen ((const char *) buf) + 1;
19943 return (const char *) buf;
19946 /* Return pointer to string at section SECT offset STR_OFFSET with error
19947 reporting strings FORM_NAME and SECT_NAME. */
19949 static const char *
19950 read_indirect_string_at_offset_from (struct objfile *objfile,
19951 bfd *abfd, LONGEST str_offset,
19952 struct dwarf2_section_info *sect,
19953 const char *form_name,
19954 const char *sect_name)
19956 dwarf2_read_section (objfile, sect);
19957 if (sect->buffer == NULL)
19958 error (_("%s used without %s section [in module %s]"),
19959 form_name, sect_name, bfd_get_filename (abfd));
19960 if (str_offset >= sect->size)
19961 error (_("%s pointing outside of %s section [in module %s]"),
19962 form_name, sect_name, bfd_get_filename (abfd));
19963 gdb_assert (HOST_CHAR_BIT == 8);
19964 if (sect->buffer[str_offset] == '\0')
19966 return (const char *) (sect->buffer + str_offset);
19969 /* Return pointer to string at .debug_str offset STR_OFFSET. */
19971 static const char *
19972 read_indirect_string_at_offset (struct dwarf2_per_objfile *dwarf2_per_objfile,
19973 bfd *abfd, LONGEST str_offset)
19975 return read_indirect_string_at_offset_from (dwarf2_per_objfile->objfile,
19977 &dwarf2_per_objfile->str,
19978 "DW_FORM_strp", ".debug_str");
19981 /* Return pointer to string at .debug_line_str offset STR_OFFSET. */
19983 static const char *
19984 read_indirect_line_string_at_offset (struct dwarf2_per_objfile *dwarf2_per_objfile,
19985 bfd *abfd, LONGEST str_offset)
19987 return read_indirect_string_at_offset_from (dwarf2_per_objfile->objfile,
19989 &dwarf2_per_objfile->line_str,
19990 "DW_FORM_line_strp",
19991 ".debug_line_str");
19994 /* Read a string at offset STR_OFFSET in the .debug_str section from
19995 the .dwz file DWZ. Throw an error if the offset is too large. If
19996 the string consists of a single NUL byte, return NULL; otherwise
19997 return a pointer to the string. */
19999 static const char *
20000 read_indirect_string_from_dwz (struct objfile *objfile, struct dwz_file *dwz,
20001 LONGEST str_offset)
20003 dwarf2_read_section (objfile, &dwz->str);
20005 if (dwz->str.buffer == NULL)
20006 error (_("DW_FORM_GNU_strp_alt used without .debug_str "
20007 "section [in module %s]"),
20008 bfd_get_filename (dwz->dwz_bfd));
20009 if (str_offset >= dwz->str.size)
20010 error (_("DW_FORM_GNU_strp_alt pointing outside of "
20011 ".debug_str section [in module %s]"),
20012 bfd_get_filename (dwz->dwz_bfd));
20013 gdb_assert (HOST_CHAR_BIT == 8);
20014 if (dwz->str.buffer[str_offset] == '\0')
20016 return (const char *) (dwz->str.buffer + str_offset);
20019 /* Return pointer to string at .debug_str offset as read from BUF.
20020 BUF is assumed to be in a compilation unit described by CU_HEADER.
20021 Return *BYTES_READ_PTR count of bytes read from BUF. */
20023 static const char *
20024 read_indirect_string (struct dwarf2_per_objfile *dwarf2_per_objfile, bfd *abfd,
20025 const gdb_byte *buf,
20026 const struct comp_unit_head *cu_header,
20027 unsigned int *bytes_read_ptr)
20029 LONGEST str_offset = read_offset (abfd, buf, cu_header, bytes_read_ptr);
20031 return read_indirect_string_at_offset (dwarf2_per_objfile, abfd, str_offset);
20034 /* Return pointer to string at .debug_line_str offset as read from BUF.
20035 BUF is assumed to be in a compilation unit described by CU_HEADER.
20036 Return *BYTES_READ_PTR count of bytes read from BUF. */
20038 static const char *
20039 read_indirect_line_string (struct dwarf2_per_objfile *dwarf2_per_objfile,
20040 bfd *abfd, const gdb_byte *buf,
20041 const struct comp_unit_head *cu_header,
20042 unsigned int *bytes_read_ptr)
20044 LONGEST str_offset = read_offset (abfd, buf, cu_header, bytes_read_ptr);
20046 return read_indirect_line_string_at_offset (dwarf2_per_objfile, abfd,
20051 read_unsigned_leb128 (bfd *abfd, const gdb_byte *buf,
20052 unsigned int *bytes_read_ptr)
20055 unsigned int num_read;
20057 unsigned char byte;
20064 byte = bfd_get_8 (abfd, buf);
20067 result |= ((ULONGEST) (byte & 127) << shift);
20068 if ((byte & 128) == 0)
20074 *bytes_read_ptr = num_read;
20079 read_signed_leb128 (bfd *abfd, const gdb_byte *buf,
20080 unsigned int *bytes_read_ptr)
20083 int shift, num_read;
20084 unsigned char byte;
20091 byte = bfd_get_8 (abfd, buf);
20094 result |= ((LONGEST) (byte & 127) << shift);
20096 if ((byte & 128) == 0)
20101 if ((shift < 8 * sizeof (result)) && (byte & 0x40))
20102 result |= -(((LONGEST) 1) << shift);
20103 *bytes_read_ptr = num_read;
20107 /* Given index ADDR_INDEX in .debug_addr, fetch the value.
20108 ADDR_BASE is the DW_AT_GNU_addr_base attribute or zero.
20109 ADDR_SIZE is the size of addresses from the CU header. */
20112 read_addr_index_1 (struct dwarf2_per_objfile *dwarf2_per_objfile,
20113 unsigned int addr_index, ULONGEST addr_base, int addr_size)
20115 struct objfile *objfile = dwarf2_per_objfile->objfile;
20116 bfd *abfd = objfile->obfd;
20117 const gdb_byte *info_ptr;
20119 dwarf2_read_section (objfile, &dwarf2_per_objfile->addr);
20120 if (dwarf2_per_objfile->addr.buffer == NULL)
20121 error (_("DW_FORM_addr_index used without .debug_addr section [in module %s]"),
20122 objfile_name (objfile));
20123 if (addr_base + addr_index * addr_size >= dwarf2_per_objfile->addr.size)
20124 error (_("DW_FORM_addr_index pointing outside of "
20125 ".debug_addr section [in module %s]"),
20126 objfile_name (objfile));
20127 info_ptr = (dwarf2_per_objfile->addr.buffer
20128 + addr_base + addr_index * addr_size);
20129 if (addr_size == 4)
20130 return bfd_get_32 (abfd, info_ptr);
20132 return bfd_get_64 (abfd, info_ptr);
20135 /* Given index ADDR_INDEX in .debug_addr, fetch the value. */
20138 read_addr_index (struct dwarf2_cu *cu, unsigned int addr_index)
20140 return read_addr_index_1 (cu->per_cu->dwarf2_per_objfile, addr_index,
20141 cu->addr_base, cu->header.addr_size);
20144 /* Given a pointer to an leb128 value, fetch the value from .debug_addr. */
20147 read_addr_index_from_leb128 (struct dwarf2_cu *cu, const gdb_byte *info_ptr,
20148 unsigned int *bytes_read)
20150 bfd *abfd = cu->per_cu->dwarf2_per_objfile->objfile->obfd;
20151 unsigned int addr_index = read_unsigned_leb128 (abfd, info_ptr, bytes_read);
20153 return read_addr_index (cu, addr_index);
20156 /* Data structure to pass results from dwarf2_read_addr_index_reader
20157 back to dwarf2_read_addr_index. */
20159 struct dwarf2_read_addr_index_data
20161 ULONGEST addr_base;
20165 /* die_reader_func for dwarf2_read_addr_index. */
20168 dwarf2_read_addr_index_reader (const struct die_reader_specs *reader,
20169 const gdb_byte *info_ptr,
20170 struct die_info *comp_unit_die,
20174 struct dwarf2_cu *cu = reader->cu;
20175 struct dwarf2_read_addr_index_data *aidata =
20176 (struct dwarf2_read_addr_index_data *) data;
20178 aidata->addr_base = cu->addr_base;
20179 aidata->addr_size = cu->header.addr_size;
20182 /* Given an index in .debug_addr, fetch the value.
20183 NOTE: This can be called during dwarf expression evaluation,
20184 long after the debug information has been read, and thus per_cu->cu
20185 may no longer exist. */
20188 dwarf2_read_addr_index (struct dwarf2_per_cu_data *per_cu,
20189 unsigned int addr_index)
20191 struct dwarf2_per_objfile *dwarf2_per_objfile = per_cu->dwarf2_per_objfile;
20192 struct objfile *objfile = dwarf2_per_objfile->objfile;
20193 struct dwarf2_cu *cu = per_cu->cu;
20194 ULONGEST addr_base;
20197 /* We need addr_base and addr_size.
20198 If we don't have PER_CU->cu, we have to get it.
20199 Nasty, but the alternative is storing the needed info in PER_CU,
20200 which at this point doesn't seem justified: it's not clear how frequently
20201 it would get used and it would increase the size of every PER_CU.
20202 Entry points like dwarf2_per_cu_addr_size do a similar thing
20203 so we're not in uncharted territory here.
20204 Alas we need to be a bit more complicated as addr_base is contained
20207 We don't need to read the entire CU(/TU).
20208 We just need the header and top level die.
20210 IWBN to use the aging mechanism to let us lazily later discard the CU.
20211 For now we skip this optimization. */
20215 addr_base = cu->addr_base;
20216 addr_size = cu->header.addr_size;
20220 struct dwarf2_read_addr_index_data aidata;
20222 /* Note: We can't use init_cutu_and_read_dies_simple here,
20223 we need addr_base. */
20224 init_cutu_and_read_dies (per_cu, NULL, 0, 0,
20225 dwarf2_read_addr_index_reader, &aidata);
20226 addr_base = aidata.addr_base;
20227 addr_size = aidata.addr_size;
20230 return read_addr_index_1 (dwarf2_per_objfile, addr_index, addr_base,
20234 /* Given a DW_FORM_GNU_str_index, fetch the string.
20235 This is only used by the Fission support. */
20237 static const char *
20238 read_str_index (const struct die_reader_specs *reader, ULONGEST str_index)
20240 struct dwarf2_cu *cu = reader->cu;
20241 struct dwarf2_per_objfile *dwarf2_per_objfile
20242 = cu->per_cu->dwarf2_per_objfile;
20243 struct objfile *objfile = dwarf2_per_objfile->objfile;
20244 const char *objf_name = objfile_name (objfile);
20245 bfd *abfd = objfile->obfd;
20246 struct dwarf2_section_info *str_section = &reader->dwo_file->sections.str;
20247 struct dwarf2_section_info *str_offsets_section =
20248 &reader->dwo_file->sections.str_offsets;
20249 const gdb_byte *info_ptr;
20250 ULONGEST str_offset;
20251 static const char form_name[] = "DW_FORM_GNU_str_index";
20253 dwarf2_read_section (objfile, str_section);
20254 dwarf2_read_section (objfile, str_offsets_section);
20255 if (str_section->buffer == NULL)
20256 error (_("%s used without .debug_str.dwo section"
20257 " in CU at offset %s [in module %s]"),
20258 form_name, sect_offset_str (cu->header.sect_off), objf_name);
20259 if (str_offsets_section->buffer == NULL)
20260 error (_("%s used without .debug_str_offsets.dwo section"
20261 " in CU at offset %s [in module %s]"),
20262 form_name, sect_offset_str (cu->header.sect_off), objf_name);
20263 if (str_index * cu->header.offset_size >= str_offsets_section->size)
20264 error (_("%s pointing outside of .debug_str_offsets.dwo"
20265 " section in CU at offset %s [in module %s]"),
20266 form_name, sect_offset_str (cu->header.sect_off), objf_name);
20267 info_ptr = (str_offsets_section->buffer
20268 + str_index * cu->header.offset_size);
20269 if (cu->header.offset_size == 4)
20270 str_offset = bfd_get_32 (abfd, info_ptr);
20272 str_offset = bfd_get_64 (abfd, info_ptr);
20273 if (str_offset >= str_section->size)
20274 error (_("Offset from %s pointing outside of"
20275 " .debug_str.dwo section in CU at offset %s [in module %s]"),
20276 form_name, sect_offset_str (cu->header.sect_off), objf_name);
20277 return (const char *) (str_section->buffer + str_offset);
20280 /* Return the length of an LEB128 number in BUF. */
20283 leb128_size (const gdb_byte *buf)
20285 const gdb_byte *begin = buf;
20291 if ((byte & 128) == 0)
20292 return buf - begin;
20297 set_cu_language (unsigned int lang, struct dwarf2_cu *cu)
20306 cu->language = language_c;
20309 case DW_LANG_C_plus_plus:
20310 case DW_LANG_C_plus_plus_11:
20311 case DW_LANG_C_plus_plus_14:
20312 cu->language = language_cplus;
20315 cu->language = language_d;
20317 case DW_LANG_Fortran77:
20318 case DW_LANG_Fortran90:
20319 case DW_LANG_Fortran95:
20320 case DW_LANG_Fortran03:
20321 case DW_LANG_Fortran08:
20322 cu->language = language_fortran;
20325 cu->language = language_go;
20327 case DW_LANG_Mips_Assembler:
20328 cu->language = language_asm;
20330 case DW_LANG_Ada83:
20331 case DW_LANG_Ada95:
20332 cu->language = language_ada;
20334 case DW_LANG_Modula2:
20335 cu->language = language_m2;
20337 case DW_LANG_Pascal83:
20338 cu->language = language_pascal;
20341 cu->language = language_objc;
20344 case DW_LANG_Rust_old:
20345 cu->language = language_rust;
20347 case DW_LANG_Cobol74:
20348 case DW_LANG_Cobol85:
20350 cu->language = language_minimal;
20353 cu->language_defn = language_def (cu->language);
20356 /* Return the named attribute or NULL if not there. */
20358 static struct attribute *
20359 dwarf2_attr (struct die_info *die, unsigned int name, struct dwarf2_cu *cu)
20364 struct attribute *spec = NULL;
20366 for (i = 0; i < die->num_attrs; ++i)
20368 if (die->attrs[i].name == name)
20369 return &die->attrs[i];
20370 if (die->attrs[i].name == DW_AT_specification
20371 || die->attrs[i].name == DW_AT_abstract_origin)
20372 spec = &die->attrs[i];
20378 die = follow_die_ref (die, spec, &cu);
20384 /* Return the named attribute or NULL if not there,
20385 but do not follow DW_AT_specification, etc.
20386 This is for use in contexts where we're reading .debug_types dies.
20387 Following DW_AT_specification, DW_AT_abstract_origin will take us
20388 back up the chain, and we want to go down. */
20390 static struct attribute *
20391 dwarf2_attr_no_follow (struct die_info *die, unsigned int name)
20395 for (i = 0; i < die->num_attrs; ++i)
20396 if (die->attrs[i].name == name)
20397 return &die->attrs[i];
20402 /* Return the string associated with a string-typed attribute, or NULL if it
20403 is either not found or is of an incorrect type. */
20405 static const char *
20406 dwarf2_string_attr (struct die_info *die, unsigned int name, struct dwarf2_cu *cu)
20408 struct attribute *attr;
20409 const char *str = NULL;
20411 attr = dwarf2_attr (die, name, cu);
20415 if (attr->form == DW_FORM_strp || attr->form == DW_FORM_line_strp
20416 || attr->form == DW_FORM_string
20417 || attr->form == DW_FORM_GNU_str_index
20418 || attr->form == DW_FORM_GNU_strp_alt)
20419 str = DW_STRING (attr);
20421 complaint (&symfile_complaints,
20422 _("string type expected for attribute %s for "
20423 "DIE at %s in module %s"),
20424 dwarf_attr_name (name), sect_offset_str (die->sect_off),
20425 objfile_name (cu->per_cu->dwarf2_per_objfile->objfile));
20431 /* Return non-zero iff the attribute NAME is defined for the given DIE,
20432 and holds a non-zero value. This function should only be used for
20433 DW_FORM_flag or DW_FORM_flag_present attributes. */
20436 dwarf2_flag_true_p (struct die_info *die, unsigned name, struct dwarf2_cu *cu)
20438 struct attribute *attr = dwarf2_attr (die, name, cu);
20440 return (attr && DW_UNSND (attr));
20444 die_is_declaration (struct die_info *die, struct dwarf2_cu *cu)
20446 /* A DIE is a declaration if it has a DW_AT_declaration attribute
20447 which value is non-zero. However, we have to be careful with
20448 DIEs having a DW_AT_specification attribute, because dwarf2_attr()
20449 (via dwarf2_flag_true_p) follows this attribute. So we may
20450 end up accidently finding a declaration attribute that belongs
20451 to a different DIE referenced by the specification attribute,
20452 even though the given DIE does not have a declaration attribute. */
20453 return (dwarf2_flag_true_p (die, DW_AT_declaration, cu)
20454 && dwarf2_attr (die, DW_AT_specification, cu) == NULL);
20457 /* Return the die giving the specification for DIE, if there is
20458 one. *SPEC_CU is the CU containing DIE on input, and the CU
20459 containing the return value on output. If there is no
20460 specification, but there is an abstract origin, that is
20463 static struct die_info *
20464 die_specification (struct die_info *die, struct dwarf2_cu **spec_cu)
20466 struct attribute *spec_attr = dwarf2_attr (die, DW_AT_specification,
20469 if (spec_attr == NULL)
20470 spec_attr = dwarf2_attr (die, DW_AT_abstract_origin, *spec_cu);
20472 if (spec_attr == NULL)
20475 return follow_die_ref (die, spec_attr, spec_cu);
20478 /* Stub for free_line_header to match void * callback types. */
20481 free_line_header_voidp (void *arg)
20483 struct line_header *lh = (struct line_header *) arg;
20489 line_header::add_include_dir (const char *include_dir)
20491 if (dwarf_line_debug >= 2)
20492 fprintf_unfiltered (gdb_stdlog, "Adding dir %zu: %s\n",
20493 include_dirs.size () + 1, include_dir);
20495 include_dirs.push_back (include_dir);
20499 line_header::add_file_name (const char *name,
20501 unsigned int mod_time,
20502 unsigned int length)
20504 if (dwarf_line_debug >= 2)
20505 fprintf_unfiltered (gdb_stdlog, "Adding file %u: %s\n",
20506 (unsigned) file_names.size () + 1, name);
20508 file_names.emplace_back (name, d_index, mod_time, length);
20511 /* A convenience function to find the proper .debug_line section for a CU. */
20513 static struct dwarf2_section_info *
20514 get_debug_line_section (struct dwarf2_cu *cu)
20516 struct dwarf2_section_info *section;
20517 struct dwarf2_per_objfile *dwarf2_per_objfile
20518 = cu->per_cu->dwarf2_per_objfile;
20520 /* For TUs in DWO files, the DW_AT_stmt_list attribute lives in the
20522 if (cu->dwo_unit && cu->per_cu->is_debug_types)
20523 section = &cu->dwo_unit->dwo_file->sections.line;
20524 else if (cu->per_cu->is_dwz)
20526 struct dwz_file *dwz = dwarf2_get_dwz_file (dwarf2_per_objfile);
20528 section = &dwz->line;
20531 section = &dwarf2_per_objfile->line;
20536 /* Read directory or file name entry format, starting with byte of
20537 format count entries, ULEB128 pairs of entry formats, ULEB128 of
20538 entries count and the entries themselves in the described entry
20542 read_formatted_entries (struct dwarf2_per_objfile *dwarf2_per_objfile,
20543 bfd *abfd, const gdb_byte **bufp,
20544 struct line_header *lh,
20545 const struct comp_unit_head *cu_header,
20546 void (*callback) (struct line_header *lh,
20549 unsigned int mod_time,
20550 unsigned int length))
20552 gdb_byte format_count, formati;
20553 ULONGEST data_count, datai;
20554 const gdb_byte *buf = *bufp;
20555 const gdb_byte *format_header_data;
20556 unsigned int bytes_read;
20558 format_count = read_1_byte (abfd, buf);
20560 format_header_data = buf;
20561 for (formati = 0; formati < format_count; formati++)
20563 read_unsigned_leb128 (abfd, buf, &bytes_read);
20565 read_unsigned_leb128 (abfd, buf, &bytes_read);
20569 data_count = read_unsigned_leb128 (abfd, buf, &bytes_read);
20571 for (datai = 0; datai < data_count; datai++)
20573 const gdb_byte *format = format_header_data;
20574 struct file_entry fe;
20576 for (formati = 0; formati < format_count; formati++)
20578 ULONGEST content_type = read_unsigned_leb128 (abfd, format, &bytes_read);
20579 format += bytes_read;
20581 ULONGEST form = read_unsigned_leb128 (abfd, format, &bytes_read);
20582 format += bytes_read;
20584 gdb::optional<const char *> string;
20585 gdb::optional<unsigned int> uint;
20589 case DW_FORM_string:
20590 string.emplace (read_direct_string (abfd, buf, &bytes_read));
20594 case DW_FORM_line_strp:
20595 string.emplace (read_indirect_line_string (dwarf2_per_objfile,
20602 case DW_FORM_data1:
20603 uint.emplace (read_1_byte (abfd, buf));
20607 case DW_FORM_data2:
20608 uint.emplace (read_2_bytes (abfd, buf));
20612 case DW_FORM_data4:
20613 uint.emplace (read_4_bytes (abfd, buf));
20617 case DW_FORM_data8:
20618 uint.emplace (read_8_bytes (abfd, buf));
20622 case DW_FORM_udata:
20623 uint.emplace (read_unsigned_leb128 (abfd, buf, &bytes_read));
20627 case DW_FORM_block:
20628 /* It is valid only for DW_LNCT_timestamp which is ignored by
20633 switch (content_type)
20636 if (string.has_value ())
20639 case DW_LNCT_directory_index:
20640 if (uint.has_value ())
20641 fe.d_index = (dir_index) *uint;
20643 case DW_LNCT_timestamp:
20644 if (uint.has_value ())
20645 fe.mod_time = *uint;
20648 if (uint.has_value ())
20654 complaint (&symfile_complaints,
20655 _("Unknown format content type %s"),
20656 pulongest (content_type));
20660 callback (lh, fe.name, fe.d_index, fe.mod_time, fe.length);
20666 /* Read the statement program header starting at OFFSET in
20667 .debug_line, or .debug_line.dwo. Return a pointer
20668 to a struct line_header, allocated using xmalloc.
20669 Returns NULL if there is a problem reading the header, e.g., if it
20670 has a version we don't understand.
20672 NOTE: the strings in the include directory and file name tables of
20673 the returned object point into the dwarf line section buffer,
20674 and must not be freed. */
20676 static line_header_up
20677 dwarf_decode_line_header (sect_offset sect_off, struct dwarf2_cu *cu)
20679 const gdb_byte *line_ptr;
20680 unsigned int bytes_read, offset_size;
20682 const char *cur_dir, *cur_file;
20683 struct dwarf2_section_info *section;
20685 struct dwarf2_per_objfile *dwarf2_per_objfile
20686 = cu->per_cu->dwarf2_per_objfile;
20688 section = get_debug_line_section (cu);
20689 dwarf2_read_section (dwarf2_per_objfile->objfile, section);
20690 if (section->buffer == NULL)
20692 if (cu->dwo_unit && cu->per_cu->is_debug_types)
20693 complaint (&symfile_complaints, _("missing .debug_line.dwo section"));
20695 complaint (&symfile_complaints, _("missing .debug_line section"));
20699 /* We can't do this until we know the section is non-empty.
20700 Only then do we know we have such a section. */
20701 abfd = get_section_bfd_owner (section);
20703 /* Make sure that at least there's room for the total_length field.
20704 That could be 12 bytes long, but we're just going to fudge that. */
20705 if (to_underlying (sect_off) + 4 >= section->size)
20707 dwarf2_statement_list_fits_in_line_number_section_complaint ();
20711 line_header_up lh (new line_header ());
20713 lh->sect_off = sect_off;
20714 lh->offset_in_dwz = cu->per_cu->is_dwz;
20716 line_ptr = section->buffer + to_underlying (sect_off);
20718 /* Read in the header. */
20720 read_checked_initial_length_and_offset (abfd, line_ptr, &cu->header,
20721 &bytes_read, &offset_size);
20722 line_ptr += bytes_read;
20723 if (line_ptr + lh->total_length > (section->buffer + section->size))
20725 dwarf2_statement_list_fits_in_line_number_section_complaint ();
20728 lh->statement_program_end = line_ptr + lh->total_length;
20729 lh->version = read_2_bytes (abfd, line_ptr);
20731 if (lh->version > 5)
20733 /* This is a version we don't understand. The format could have
20734 changed in ways we don't handle properly so just punt. */
20735 complaint (&symfile_complaints,
20736 _("unsupported version in .debug_line section"));
20739 if (lh->version >= 5)
20741 gdb_byte segment_selector_size;
20743 /* Skip address size. */
20744 read_1_byte (abfd, line_ptr);
20747 segment_selector_size = read_1_byte (abfd, line_ptr);
20749 if (segment_selector_size != 0)
20751 complaint (&symfile_complaints,
20752 _("unsupported segment selector size %u "
20753 "in .debug_line section"),
20754 segment_selector_size);
20758 lh->header_length = read_offset_1 (abfd, line_ptr, offset_size);
20759 line_ptr += offset_size;
20760 lh->minimum_instruction_length = read_1_byte (abfd, line_ptr);
20762 if (lh->version >= 4)
20764 lh->maximum_ops_per_instruction = read_1_byte (abfd, line_ptr);
20768 lh->maximum_ops_per_instruction = 1;
20770 if (lh->maximum_ops_per_instruction == 0)
20772 lh->maximum_ops_per_instruction = 1;
20773 complaint (&symfile_complaints,
20774 _("invalid maximum_ops_per_instruction "
20775 "in `.debug_line' section"));
20778 lh->default_is_stmt = read_1_byte (abfd, line_ptr);
20780 lh->line_base = read_1_signed_byte (abfd, line_ptr);
20782 lh->line_range = read_1_byte (abfd, line_ptr);
20784 lh->opcode_base = read_1_byte (abfd, line_ptr);
20786 lh->standard_opcode_lengths.reset (new unsigned char[lh->opcode_base]);
20788 lh->standard_opcode_lengths[0] = 1; /* This should never be used anyway. */
20789 for (i = 1; i < lh->opcode_base; ++i)
20791 lh->standard_opcode_lengths[i] = read_1_byte (abfd, line_ptr);
20795 if (lh->version >= 5)
20797 /* Read directory table. */
20798 read_formatted_entries (dwarf2_per_objfile, abfd, &line_ptr, lh.get (),
20800 [] (struct line_header *lh, const char *name,
20801 dir_index d_index, unsigned int mod_time,
20802 unsigned int length)
20804 lh->add_include_dir (name);
20807 /* Read file name table. */
20808 read_formatted_entries (dwarf2_per_objfile, abfd, &line_ptr, lh.get (),
20810 [] (struct line_header *lh, const char *name,
20811 dir_index d_index, unsigned int mod_time,
20812 unsigned int length)
20814 lh->add_file_name (name, d_index, mod_time, length);
20819 /* Read directory table. */
20820 while ((cur_dir = read_direct_string (abfd, line_ptr, &bytes_read)) != NULL)
20822 line_ptr += bytes_read;
20823 lh->add_include_dir (cur_dir);
20825 line_ptr += bytes_read;
20827 /* Read file name table. */
20828 while ((cur_file = read_direct_string (abfd, line_ptr, &bytes_read)) != NULL)
20830 unsigned int mod_time, length;
20833 line_ptr += bytes_read;
20834 d_index = (dir_index) read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
20835 line_ptr += bytes_read;
20836 mod_time = read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
20837 line_ptr += bytes_read;
20838 length = read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
20839 line_ptr += bytes_read;
20841 lh->add_file_name (cur_file, d_index, mod_time, length);
20843 line_ptr += bytes_read;
20845 lh->statement_program_start = line_ptr;
20847 if (line_ptr > (section->buffer + section->size))
20848 complaint (&symfile_complaints,
20849 _("line number info header doesn't "
20850 "fit in `.debug_line' section"));
20855 /* Subroutine of dwarf_decode_lines to simplify it.
20856 Return the file name of the psymtab for included file FILE_INDEX
20857 in line header LH of PST.
20858 COMP_DIR is the compilation directory (DW_AT_comp_dir) or NULL if unknown.
20859 If space for the result is malloc'd, *NAME_HOLDER will be set.
20860 Returns NULL if FILE_INDEX should be ignored, i.e., it is pst->filename. */
20862 static const char *
20863 psymtab_include_file_name (const struct line_header *lh, int file_index,
20864 const struct partial_symtab *pst,
20865 const char *comp_dir,
20866 gdb::unique_xmalloc_ptr<char> *name_holder)
20868 const file_entry &fe = lh->file_names[file_index];
20869 const char *include_name = fe.name;
20870 const char *include_name_to_compare = include_name;
20871 const char *pst_filename;
20874 const char *dir_name = fe.include_dir (lh);
20876 gdb::unique_xmalloc_ptr<char> hold_compare;
20877 if (!IS_ABSOLUTE_PATH (include_name)
20878 && (dir_name != NULL || comp_dir != NULL))
20880 /* Avoid creating a duplicate psymtab for PST.
20881 We do this by comparing INCLUDE_NAME and PST_FILENAME.
20882 Before we do the comparison, however, we need to account
20883 for DIR_NAME and COMP_DIR.
20884 First prepend dir_name (if non-NULL). If we still don't
20885 have an absolute path prepend comp_dir (if non-NULL).
20886 However, the directory we record in the include-file's
20887 psymtab does not contain COMP_DIR (to match the
20888 corresponding symtab(s)).
20893 bash$ gcc -g ./hello.c
20894 include_name = "hello.c"
20896 DW_AT_comp_dir = comp_dir = "/tmp"
20897 DW_AT_name = "./hello.c"
20901 if (dir_name != NULL)
20903 name_holder->reset (concat (dir_name, SLASH_STRING,
20904 include_name, (char *) NULL));
20905 include_name = name_holder->get ();
20906 include_name_to_compare = include_name;
20908 if (!IS_ABSOLUTE_PATH (include_name) && comp_dir != NULL)
20910 hold_compare.reset (concat (comp_dir, SLASH_STRING,
20911 include_name, (char *) NULL));
20912 include_name_to_compare = hold_compare.get ();
20916 pst_filename = pst->filename;
20917 gdb::unique_xmalloc_ptr<char> copied_name;
20918 if (!IS_ABSOLUTE_PATH (pst_filename) && pst->dirname != NULL)
20920 copied_name.reset (concat (pst->dirname, SLASH_STRING,
20921 pst_filename, (char *) NULL));
20922 pst_filename = copied_name.get ();
20925 file_is_pst = FILENAME_CMP (include_name_to_compare, pst_filename) == 0;
20929 return include_name;
20932 /* State machine to track the state of the line number program. */
20934 class lnp_state_machine
20937 /* Initialize a machine state for the start of a line number
20939 lnp_state_machine (gdbarch *arch, line_header *lh, bool record_lines_p);
20941 file_entry *current_file ()
20943 /* lh->file_names is 0-based, but the file name numbers in the
20944 statement program are 1-based. */
20945 return m_line_header->file_name_at (m_file);
20948 /* Record the line in the state machine. END_SEQUENCE is true if
20949 we're processing the end of a sequence. */
20950 void record_line (bool end_sequence);
20952 /* Check address and if invalid nop-out the rest of the lines in this
20954 void check_line_address (struct dwarf2_cu *cu,
20955 const gdb_byte *line_ptr,
20956 CORE_ADDR lowpc, CORE_ADDR address);
20958 void handle_set_discriminator (unsigned int discriminator)
20960 m_discriminator = discriminator;
20961 m_line_has_non_zero_discriminator |= discriminator != 0;
20964 /* Handle DW_LNE_set_address. */
20965 void handle_set_address (CORE_ADDR baseaddr, CORE_ADDR address)
20968 address += baseaddr;
20969 m_address = gdbarch_adjust_dwarf2_line (m_gdbarch, address, false);
20972 /* Handle DW_LNS_advance_pc. */
20973 void handle_advance_pc (CORE_ADDR adjust);
20975 /* Handle a special opcode. */
20976 void handle_special_opcode (unsigned char op_code);
20978 /* Handle DW_LNS_advance_line. */
20979 void handle_advance_line (int line_delta)
20981 advance_line (line_delta);
20984 /* Handle DW_LNS_set_file. */
20985 void handle_set_file (file_name_index file);
20987 /* Handle DW_LNS_negate_stmt. */
20988 void handle_negate_stmt ()
20990 m_is_stmt = !m_is_stmt;
20993 /* Handle DW_LNS_const_add_pc. */
20994 void handle_const_add_pc ();
20996 /* Handle DW_LNS_fixed_advance_pc. */
20997 void handle_fixed_advance_pc (CORE_ADDR addr_adj)
20999 m_address += gdbarch_adjust_dwarf2_line (m_gdbarch, addr_adj, true);
21003 /* Handle DW_LNS_copy. */
21004 void handle_copy ()
21006 record_line (false);
21007 m_discriminator = 0;
21010 /* Handle DW_LNE_end_sequence. */
21011 void handle_end_sequence ()
21013 m_record_line_callback = ::record_line;
21017 /* Advance the line by LINE_DELTA. */
21018 void advance_line (int line_delta)
21020 m_line += line_delta;
21022 if (line_delta != 0)
21023 m_line_has_non_zero_discriminator = m_discriminator != 0;
21026 gdbarch *m_gdbarch;
21028 /* True if we're recording lines.
21029 Otherwise we're building partial symtabs and are just interested in
21030 finding include files mentioned by the line number program. */
21031 bool m_record_lines_p;
21033 /* The line number header. */
21034 line_header *m_line_header;
21036 /* These are part of the standard DWARF line number state machine,
21037 and initialized according to the DWARF spec. */
21039 unsigned char m_op_index = 0;
21040 /* The line table index (1-based) of the current file. */
21041 file_name_index m_file = (file_name_index) 1;
21042 unsigned int m_line = 1;
21044 /* These are initialized in the constructor. */
21046 CORE_ADDR m_address;
21048 unsigned int m_discriminator;
21050 /* Additional bits of state we need to track. */
21052 /* The last file that we called dwarf2_start_subfile for.
21053 This is only used for TLLs. */
21054 unsigned int m_last_file = 0;
21055 /* The last file a line number was recorded for. */
21056 struct subfile *m_last_subfile = NULL;
21058 /* The function to call to record a line. */
21059 record_line_ftype *m_record_line_callback = NULL;
21061 /* The last line number that was recorded, used to coalesce
21062 consecutive entries for the same line. This can happen, for
21063 example, when discriminators are present. PR 17276. */
21064 unsigned int m_last_line = 0;
21065 bool m_line_has_non_zero_discriminator = false;
21069 lnp_state_machine::handle_advance_pc (CORE_ADDR adjust)
21071 CORE_ADDR addr_adj = (((m_op_index + adjust)
21072 / m_line_header->maximum_ops_per_instruction)
21073 * m_line_header->minimum_instruction_length);
21074 m_address += gdbarch_adjust_dwarf2_line (m_gdbarch, addr_adj, true);
21075 m_op_index = ((m_op_index + adjust)
21076 % m_line_header->maximum_ops_per_instruction);
21080 lnp_state_machine::handle_special_opcode (unsigned char op_code)
21082 unsigned char adj_opcode = op_code - m_line_header->opcode_base;
21083 CORE_ADDR addr_adj = (((m_op_index
21084 + (adj_opcode / m_line_header->line_range))
21085 / m_line_header->maximum_ops_per_instruction)
21086 * m_line_header->minimum_instruction_length);
21087 m_address += gdbarch_adjust_dwarf2_line (m_gdbarch, addr_adj, true);
21088 m_op_index = ((m_op_index + (adj_opcode / m_line_header->line_range))
21089 % m_line_header->maximum_ops_per_instruction);
21091 int line_delta = (m_line_header->line_base
21092 + (adj_opcode % m_line_header->line_range));
21093 advance_line (line_delta);
21094 record_line (false);
21095 m_discriminator = 0;
21099 lnp_state_machine::handle_set_file (file_name_index file)
21103 const file_entry *fe = current_file ();
21105 dwarf2_debug_line_missing_file_complaint ();
21106 else if (m_record_lines_p)
21108 const char *dir = fe->include_dir (m_line_header);
21110 m_last_subfile = current_subfile;
21111 m_line_has_non_zero_discriminator = m_discriminator != 0;
21112 dwarf2_start_subfile (fe->name, dir);
21117 lnp_state_machine::handle_const_add_pc ()
21120 = (255 - m_line_header->opcode_base) / m_line_header->line_range;
21123 = (((m_op_index + adjust)
21124 / m_line_header->maximum_ops_per_instruction)
21125 * m_line_header->minimum_instruction_length);
21127 m_address += gdbarch_adjust_dwarf2_line (m_gdbarch, addr_adj, true);
21128 m_op_index = ((m_op_index + adjust)
21129 % m_line_header->maximum_ops_per_instruction);
21132 /* Ignore this record_line request. */
21135 noop_record_line (struct subfile *subfile, int line, CORE_ADDR pc)
21140 /* Return non-zero if we should add LINE to the line number table.
21141 LINE is the line to add, LAST_LINE is the last line that was added,
21142 LAST_SUBFILE is the subfile for LAST_LINE.
21143 LINE_HAS_NON_ZERO_DISCRIMINATOR is non-zero if LINE has ever
21144 had a non-zero discriminator.
21146 We have to be careful in the presence of discriminators.
21147 E.g., for this line:
21149 for (i = 0; i < 100000; i++);
21151 clang can emit four line number entries for that one line,
21152 each with a different discriminator.
21153 See gdb.dwarf2/dw2-single-line-discriminators.exp for an example.
21155 However, we want gdb to coalesce all four entries into one.
21156 Otherwise the user could stepi into the middle of the line and
21157 gdb would get confused about whether the pc really was in the
21158 middle of the line.
21160 Things are further complicated by the fact that two consecutive
21161 line number entries for the same line is a heuristic used by gcc
21162 to denote the end of the prologue. So we can't just discard duplicate
21163 entries, we have to be selective about it. The heuristic we use is
21164 that we only collapse consecutive entries for the same line if at least
21165 one of those entries has a non-zero discriminator. PR 17276.
21167 Note: Addresses in the line number state machine can never go backwards
21168 within one sequence, thus this coalescing is ok. */
21171 dwarf_record_line_p (unsigned int line, unsigned int last_line,
21172 int line_has_non_zero_discriminator,
21173 struct subfile *last_subfile)
21175 if (current_subfile != last_subfile)
21177 if (line != last_line)
21179 /* Same line for the same file that we've seen already.
21180 As a last check, for pr 17276, only record the line if the line
21181 has never had a non-zero discriminator. */
21182 if (!line_has_non_zero_discriminator)
21187 /* Use P_RECORD_LINE to record line number LINE beginning at address ADDRESS
21188 in the line table of subfile SUBFILE. */
21191 dwarf_record_line_1 (struct gdbarch *gdbarch, struct subfile *subfile,
21192 unsigned int line, CORE_ADDR address,
21193 record_line_ftype p_record_line)
21195 CORE_ADDR addr = gdbarch_addr_bits_remove (gdbarch, address);
21197 if (dwarf_line_debug)
21199 fprintf_unfiltered (gdb_stdlog,
21200 "Recording line %u, file %s, address %s\n",
21201 line, lbasename (subfile->name),
21202 paddress (gdbarch, address));
21205 (*p_record_line) (subfile, line, addr);
21208 /* Subroutine of dwarf_decode_lines_1 to simplify it.
21209 Mark the end of a set of line number records.
21210 The arguments are the same as for dwarf_record_line_1.
21211 If SUBFILE is NULL the request is ignored. */
21214 dwarf_finish_line (struct gdbarch *gdbarch, struct subfile *subfile,
21215 CORE_ADDR address, record_line_ftype p_record_line)
21217 if (subfile == NULL)
21220 if (dwarf_line_debug)
21222 fprintf_unfiltered (gdb_stdlog,
21223 "Finishing current line, file %s, address %s\n",
21224 lbasename (subfile->name),
21225 paddress (gdbarch, address));
21228 dwarf_record_line_1 (gdbarch, subfile, 0, address, p_record_line);
21232 lnp_state_machine::record_line (bool end_sequence)
21234 if (dwarf_line_debug)
21236 fprintf_unfiltered (gdb_stdlog,
21237 "Processing actual line %u: file %u,"
21238 " address %s, is_stmt %u, discrim %u\n",
21239 m_line, to_underlying (m_file),
21240 paddress (m_gdbarch, m_address),
21241 m_is_stmt, m_discriminator);
21244 file_entry *fe = current_file ();
21247 dwarf2_debug_line_missing_file_complaint ();
21248 /* For now we ignore lines not starting on an instruction boundary.
21249 But not when processing end_sequence for compatibility with the
21250 previous version of the code. */
21251 else if (m_op_index == 0 || end_sequence)
21253 fe->included_p = 1;
21254 if (m_record_lines_p && m_is_stmt)
21256 if (m_last_subfile != current_subfile || end_sequence)
21258 dwarf_finish_line (m_gdbarch, m_last_subfile,
21259 m_address, m_record_line_callback);
21264 if (dwarf_record_line_p (m_line, m_last_line,
21265 m_line_has_non_zero_discriminator,
21268 dwarf_record_line_1 (m_gdbarch, current_subfile,
21270 m_record_line_callback);
21272 m_last_subfile = current_subfile;
21273 m_last_line = m_line;
21279 lnp_state_machine::lnp_state_machine (gdbarch *arch, line_header *lh,
21280 bool record_lines_p)
21283 m_record_lines_p = record_lines_p;
21284 m_line_header = lh;
21286 m_record_line_callback = ::record_line;
21288 /* Call `gdbarch_adjust_dwarf2_line' on the initial 0 address as if there
21289 was a line entry for it so that the backend has a chance to adjust it
21290 and also record it in case it needs it. This is currently used by MIPS
21291 code, cf. `mips_adjust_dwarf2_line'. */
21292 m_address = gdbarch_adjust_dwarf2_line (arch, 0, 0);
21293 m_is_stmt = lh->default_is_stmt;
21294 m_discriminator = 0;
21298 lnp_state_machine::check_line_address (struct dwarf2_cu *cu,
21299 const gdb_byte *line_ptr,
21300 CORE_ADDR lowpc, CORE_ADDR address)
21302 /* If address < lowpc then it's not a usable value, it's outside the
21303 pc range of the CU. However, we restrict the test to only address
21304 values of zero to preserve GDB's previous behaviour which is to
21305 handle the specific case of a function being GC'd by the linker. */
21307 if (address == 0 && address < lowpc)
21309 /* This line table is for a function which has been
21310 GCd by the linker. Ignore it. PR gdb/12528 */
21312 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
21313 long line_offset = line_ptr - get_debug_line_section (cu)->buffer;
21315 complaint (&symfile_complaints,
21316 _(".debug_line address at offset 0x%lx is 0 [in module %s]"),
21317 line_offset, objfile_name (objfile));
21318 m_record_line_callback = noop_record_line;
21319 /* Note: record_line_callback is left as noop_record_line until
21320 we see DW_LNE_end_sequence. */
21324 /* Subroutine of dwarf_decode_lines to simplify it.
21325 Process the line number information in LH.
21326 If DECODE_FOR_PST_P is non-zero, all we do is process the line number
21327 program in order to set included_p for every referenced header. */
21330 dwarf_decode_lines_1 (struct line_header *lh, struct dwarf2_cu *cu,
21331 const int decode_for_pst_p, CORE_ADDR lowpc)
21333 const gdb_byte *line_ptr, *extended_end;
21334 const gdb_byte *line_end;
21335 unsigned int bytes_read, extended_len;
21336 unsigned char op_code, extended_op;
21337 CORE_ADDR baseaddr;
21338 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
21339 bfd *abfd = objfile->obfd;
21340 struct gdbarch *gdbarch = get_objfile_arch (objfile);
21341 /* True if we're recording line info (as opposed to building partial
21342 symtabs and just interested in finding include files mentioned by
21343 the line number program). */
21344 bool record_lines_p = !decode_for_pst_p;
21346 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
21348 line_ptr = lh->statement_program_start;
21349 line_end = lh->statement_program_end;
21351 /* Read the statement sequences until there's nothing left. */
21352 while (line_ptr < line_end)
21354 /* The DWARF line number program state machine. Reset the state
21355 machine at the start of each sequence. */
21356 lnp_state_machine state_machine (gdbarch, lh, record_lines_p);
21357 bool end_sequence = false;
21359 if (record_lines_p)
21361 /* Start a subfile for the current file of the state
21363 const file_entry *fe = state_machine.current_file ();
21366 dwarf2_start_subfile (fe->name, fe->include_dir (lh));
21369 /* Decode the table. */
21370 while (line_ptr < line_end && !end_sequence)
21372 op_code = read_1_byte (abfd, line_ptr);
21375 if (op_code >= lh->opcode_base)
21377 /* Special opcode. */
21378 state_machine.handle_special_opcode (op_code);
21380 else switch (op_code)
21382 case DW_LNS_extended_op:
21383 extended_len = read_unsigned_leb128 (abfd, line_ptr,
21385 line_ptr += bytes_read;
21386 extended_end = line_ptr + extended_len;
21387 extended_op = read_1_byte (abfd, line_ptr);
21389 switch (extended_op)
21391 case DW_LNE_end_sequence:
21392 state_machine.handle_end_sequence ();
21393 end_sequence = true;
21395 case DW_LNE_set_address:
21398 = read_address (abfd, line_ptr, cu, &bytes_read);
21399 line_ptr += bytes_read;
21401 state_machine.check_line_address (cu, line_ptr,
21403 state_machine.handle_set_address (baseaddr, address);
21406 case DW_LNE_define_file:
21408 const char *cur_file;
21409 unsigned int mod_time, length;
21412 cur_file = read_direct_string (abfd, line_ptr,
21414 line_ptr += bytes_read;
21415 dindex = (dir_index)
21416 read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
21417 line_ptr += bytes_read;
21419 read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
21420 line_ptr += bytes_read;
21422 read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
21423 line_ptr += bytes_read;
21424 lh->add_file_name (cur_file, dindex, mod_time, length);
21427 case DW_LNE_set_discriminator:
21429 /* The discriminator is not interesting to the
21430 debugger; just ignore it. We still need to
21431 check its value though:
21432 if there are consecutive entries for the same
21433 (non-prologue) line we want to coalesce them.
21436 = read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
21437 line_ptr += bytes_read;
21439 state_machine.handle_set_discriminator (discr);
21443 complaint (&symfile_complaints,
21444 _("mangled .debug_line section"));
21447 /* Make sure that we parsed the extended op correctly. If e.g.
21448 we expected a different address size than the producer used,
21449 we may have read the wrong number of bytes. */
21450 if (line_ptr != extended_end)
21452 complaint (&symfile_complaints,
21453 _("mangled .debug_line section"));
21458 state_machine.handle_copy ();
21460 case DW_LNS_advance_pc:
21463 = read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
21464 line_ptr += bytes_read;
21466 state_machine.handle_advance_pc (adjust);
21469 case DW_LNS_advance_line:
21472 = read_signed_leb128 (abfd, line_ptr, &bytes_read);
21473 line_ptr += bytes_read;
21475 state_machine.handle_advance_line (line_delta);
21478 case DW_LNS_set_file:
21480 file_name_index file
21481 = (file_name_index) read_unsigned_leb128 (abfd, line_ptr,
21483 line_ptr += bytes_read;
21485 state_machine.handle_set_file (file);
21488 case DW_LNS_set_column:
21489 (void) read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
21490 line_ptr += bytes_read;
21492 case DW_LNS_negate_stmt:
21493 state_machine.handle_negate_stmt ();
21495 case DW_LNS_set_basic_block:
21497 /* Add to the address register of the state machine the
21498 address increment value corresponding to special opcode
21499 255. I.e., this value is scaled by the minimum
21500 instruction length since special opcode 255 would have
21501 scaled the increment. */
21502 case DW_LNS_const_add_pc:
21503 state_machine.handle_const_add_pc ();
21505 case DW_LNS_fixed_advance_pc:
21507 CORE_ADDR addr_adj = read_2_bytes (abfd, line_ptr);
21510 state_machine.handle_fixed_advance_pc (addr_adj);
21515 /* Unknown standard opcode, ignore it. */
21518 for (i = 0; i < lh->standard_opcode_lengths[op_code]; i++)
21520 (void) read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
21521 line_ptr += bytes_read;
21528 dwarf2_debug_line_missing_end_sequence_complaint ();
21530 /* We got a DW_LNE_end_sequence (or we ran off the end of the buffer,
21531 in which case we still finish recording the last line). */
21532 state_machine.record_line (true);
21536 /* Decode the Line Number Program (LNP) for the given line_header
21537 structure and CU. The actual information extracted and the type
21538 of structures created from the LNP depends on the value of PST.
21540 1. If PST is NULL, then this procedure uses the data from the program
21541 to create all necessary symbol tables, and their linetables.
21543 2. If PST is not NULL, this procedure reads the program to determine
21544 the list of files included by the unit represented by PST, and
21545 builds all the associated partial symbol tables.
21547 COMP_DIR is the compilation directory (DW_AT_comp_dir) or NULL if unknown.
21548 It is used for relative paths in the line table.
21549 NOTE: When processing partial symtabs (pst != NULL),
21550 comp_dir == pst->dirname.
21552 NOTE: It is important that psymtabs have the same file name (via strcmp)
21553 as the corresponding symtab. Since COMP_DIR is not used in the name of the
21554 symtab we don't use it in the name of the psymtabs we create.
21555 E.g. expand_line_sal requires this when finding psymtabs to expand.
21556 A good testcase for this is mb-inline.exp.
21558 LOWPC is the lowest address in CU (or 0 if not known).
21560 Boolean DECODE_MAPPING specifies we need to fully decode .debug_line
21561 for its PC<->lines mapping information. Otherwise only the filename
21562 table is read in. */
21565 dwarf_decode_lines (struct line_header *lh, const char *comp_dir,
21566 struct dwarf2_cu *cu, struct partial_symtab *pst,
21567 CORE_ADDR lowpc, int decode_mapping)
21569 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
21570 const int decode_for_pst_p = (pst != NULL);
21572 if (decode_mapping)
21573 dwarf_decode_lines_1 (lh, cu, decode_for_pst_p, lowpc);
21575 if (decode_for_pst_p)
21579 /* Now that we're done scanning the Line Header Program, we can
21580 create the psymtab of each included file. */
21581 for (file_index = 0; file_index < lh->file_names.size (); file_index++)
21582 if (lh->file_names[file_index].included_p == 1)
21584 gdb::unique_xmalloc_ptr<char> name_holder;
21585 const char *include_name =
21586 psymtab_include_file_name (lh, file_index, pst, comp_dir,
21588 if (include_name != NULL)
21589 dwarf2_create_include_psymtab (include_name, pst, objfile);
21594 /* Make sure a symtab is created for every file, even files
21595 which contain only variables (i.e. no code with associated
21597 struct compunit_symtab *cust = buildsym_compunit_symtab ();
21600 for (i = 0; i < lh->file_names.size (); i++)
21602 file_entry &fe = lh->file_names[i];
21604 dwarf2_start_subfile (fe.name, fe.include_dir (lh));
21606 if (current_subfile->symtab == NULL)
21608 current_subfile->symtab
21609 = allocate_symtab (cust, current_subfile->name);
21611 fe.symtab = current_subfile->symtab;
21616 /* Start a subfile for DWARF. FILENAME is the name of the file and
21617 DIRNAME the name of the source directory which contains FILENAME
21618 or NULL if not known.
21619 This routine tries to keep line numbers from identical absolute and
21620 relative file names in a common subfile.
21622 Using the `list' example from the GDB testsuite, which resides in
21623 /srcdir and compiling it with Irix6.2 cc in /compdir using a filename
21624 of /srcdir/list0.c yields the following debugging information for list0.c:
21626 DW_AT_name: /srcdir/list0.c
21627 DW_AT_comp_dir: /compdir
21628 files.files[0].name: list0.h
21629 files.files[0].dir: /srcdir
21630 files.files[1].name: list0.c
21631 files.files[1].dir: /srcdir
21633 The line number information for list0.c has to end up in a single
21634 subfile, so that `break /srcdir/list0.c:1' works as expected.
21635 start_subfile will ensure that this happens provided that we pass the
21636 concatenation of files.files[1].dir and files.files[1].name as the
21640 dwarf2_start_subfile (const char *filename, const char *dirname)
21644 /* In order not to lose the line information directory,
21645 we concatenate it to the filename when it makes sense.
21646 Note that the Dwarf3 standard says (speaking of filenames in line
21647 information): ``The directory index is ignored for file names
21648 that represent full path names''. Thus ignoring dirname in the
21649 `else' branch below isn't an issue. */
21651 if (!IS_ABSOLUTE_PATH (filename) && dirname != NULL)
21653 copy = concat (dirname, SLASH_STRING, filename, (char *)NULL);
21657 start_subfile (filename);
21663 /* Start a symtab for DWARF.
21664 NAME, COMP_DIR, LOW_PC are passed to start_symtab. */
21666 static struct compunit_symtab *
21667 dwarf2_start_symtab (struct dwarf2_cu *cu,
21668 const char *name, const char *comp_dir, CORE_ADDR low_pc)
21670 struct compunit_symtab *cust
21671 = start_symtab (cu->per_cu->dwarf2_per_objfile->objfile, name, comp_dir,
21672 low_pc, cu->language);
21674 record_debugformat ("DWARF 2");
21675 record_producer (cu->producer);
21677 /* We assume that we're processing GCC output. */
21678 processing_gcc_compilation = 2;
21680 cu->processing_has_namespace_info = 0;
21686 var_decode_location (struct attribute *attr, struct symbol *sym,
21687 struct dwarf2_cu *cu)
21689 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
21690 struct comp_unit_head *cu_header = &cu->header;
21692 /* NOTE drow/2003-01-30: There used to be a comment and some special
21693 code here to turn a symbol with DW_AT_external and a
21694 SYMBOL_VALUE_ADDRESS of 0 into a LOC_UNRESOLVED symbol. This was
21695 necessary for platforms (maybe Alpha, certainly PowerPC GNU/Linux
21696 with some versions of binutils) where shared libraries could have
21697 relocations against symbols in their debug information - the
21698 minimal symbol would have the right address, but the debug info
21699 would not. It's no longer necessary, because we will explicitly
21700 apply relocations when we read in the debug information now. */
21702 /* A DW_AT_location attribute with no contents indicates that a
21703 variable has been optimized away. */
21704 if (attr_form_is_block (attr) && DW_BLOCK (attr)->size == 0)
21706 SYMBOL_ACLASS_INDEX (sym) = LOC_OPTIMIZED_OUT;
21710 /* Handle one degenerate form of location expression specially, to
21711 preserve GDB's previous behavior when section offsets are
21712 specified. If this is just a DW_OP_addr or DW_OP_GNU_addr_index
21713 then mark this symbol as LOC_STATIC. */
21715 if (attr_form_is_block (attr)
21716 && ((DW_BLOCK (attr)->data[0] == DW_OP_addr
21717 && DW_BLOCK (attr)->size == 1 + cu_header->addr_size)
21718 || (DW_BLOCK (attr)->data[0] == DW_OP_GNU_addr_index
21719 && (DW_BLOCK (attr)->size
21720 == 1 + leb128_size (&DW_BLOCK (attr)->data[1])))))
21722 unsigned int dummy;
21724 if (DW_BLOCK (attr)->data[0] == DW_OP_addr)
21725 SYMBOL_VALUE_ADDRESS (sym) =
21726 read_address (objfile->obfd, DW_BLOCK (attr)->data + 1, cu, &dummy);
21728 SYMBOL_VALUE_ADDRESS (sym) =
21729 read_addr_index_from_leb128 (cu, DW_BLOCK (attr)->data + 1, &dummy);
21730 SYMBOL_ACLASS_INDEX (sym) = LOC_STATIC;
21731 fixup_symbol_section (sym, objfile);
21732 SYMBOL_VALUE_ADDRESS (sym) += ANOFFSET (objfile->section_offsets,
21733 SYMBOL_SECTION (sym));
21737 /* NOTE drow/2002-01-30: It might be worthwhile to have a static
21738 expression evaluator, and use LOC_COMPUTED only when necessary
21739 (i.e. when the value of a register or memory location is
21740 referenced, or a thread-local block, etc.). Then again, it might
21741 not be worthwhile. I'm assuming that it isn't unless performance
21742 or memory numbers show me otherwise. */
21744 dwarf2_symbol_mark_computed (attr, sym, cu, 0);
21746 if (SYMBOL_COMPUTED_OPS (sym)->location_has_loclist)
21747 cu->has_loclist = 1;
21750 /* Given a pointer to a DWARF information entry, figure out if we need
21751 to make a symbol table entry for it, and if so, create a new entry
21752 and return a pointer to it.
21753 If TYPE is NULL, determine symbol type from the die, otherwise
21754 used the passed type.
21755 If SPACE is not NULL, use it to hold the new symbol. If it is
21756 NULL, allocate a new symbol on the objfile's obstack. */
21758 static struct symbol *
21759 new_symbol (struct die_info *die, struct type *type, struct dwarf2_cu *cu,
21760 struct symbol *space)
21762 struct dwarf2_per_objfile *dwarf2_per_objfile
21763 = cu->per_cu->dwarf2_per_objfile;
21764 struct objfile *objfile = dwarf2_per_objfile->objfile;
21765 struct gdbarch *gdbarch = get_objfile_arch (objfile);
21766 struct symbol *sym = NULL;
21768 struct attribute *attr = NULL;
21769 struct attribute *attr2 = NULL;
21770 CORE_ADDR baseaddr;
21771 struct pending **list_to_add = NULL;
21773 int inlined_func = (die->tag == DW_TAG_inlined_subroutine);
21775 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
21777 name = dwarf2_name (die, cu);
21780 const char *linkagename;
21781 int suppress_add = 0;
21786 sym = allocate_symbol (objfile);
21787 OBJSTAT (objfile, n_syms++);
21789 /* Cache this symbol's name and the name's demangled form (if any). */
21790 SYMBOL_SET_LANGUAGE (sym, cu->language, &objfile->objfile_obstack);
21791 linkagename = dwarf2_physname (name, die, cu);
21792 SYMBOL_SET_NAMES (sym, linkagename, strlen (linkagename), 0, objfile);
21794 /* Fortran does not have mangling standard and the mangling does differ
21795 between gfortran, iFort etc. */
21796 if (cu->language == language_fortran
21797 && symbol_get_demangled_name (&(sym->ginfo)) == NULL)
21798 symbol_set_demangled_name (&(sym->ginfo),
21799 dwarf2_full_name (name, die, cu),
21802 /* Default assumptions.
21803 Use the passed type or decode it from the die. */
21804 SYMBOL_DOMAIN (sym) = VAR_DOMAIN;
21805 SYMBOL_ACLASS_INDEX (sym) = LOC_OPTIMIZED_OUT;
21807 SYMBOL_TYPE (sym) = type;
21809 SYMBOL_TYPE (sym) = die_type (die, cu);
21810 attr = dwarf2_attr (die,
21811 inlined_func ? DW_AT_call_line : DW_AT_decl_line,
21815 SYMBOL_LINE (sym) = DW_UNSND (attr);
21818 attr = dwarf2_attr (die,
21819 inlined_func ? DW_AT_call_file : DW_AT_decl_file,
21823 file_name_index file_index = (file_name_index) DW_UNSND (attr);
21824 struct file_entry *fe;
21826 if (cu->line_header != NULL)
21827 fe = cu->line_header->file_name_at (file_index);
21832 complaint (&symfile_complaints,
21833 _("file index out of range"));
21835 symbol_set_symtab (sym, fe->symtab);
21841 attr = dwarf2_attr (die, DW_AT_low_pc, cu);
21846 addr = attr_value_as_address (attr);
21847 addr = gdbarch_adjust_dwarf2_addr (gdbarch, addr + baseaddr);
21848 SYMBOL_VALUE_ADDRESS (sym) = addr;
21850 SYMBOL_TYPE (sym) = objfile_type (objfile)->builtin_core_addr;
21851 SYMBOL_DOMAIN (sym) = LABEL_DOMAIN;
21852 SYMBOL_ACLASS_INDEX (sym) = LOC_LABEL;
21853 add_symbol_to_list (sym, cu->list_in_scope);
21855 case DW_TAG_subprogram:
21856 /* SYMBOL_BLOCK_VALUE (sym) will be filled in later by
21858 SYMBOL_ACLASS_INDEX (sym) = LOC_BLOCK;
21859 attr2 = dwarf2_attr (die, DW_AT_external, cu);
21860 if ((attr2 && (DW_UNSND (attr2) != 0))
21861 || cu->language == language_ada)
21863 /* Subprograms marked external are stored as a global symbol.
21864 Ada subprograms, whether marked external or not, are always
21865 stored as a global symbol, because we want to be able to
21866 access them globally. For instance, we want to be able
21867 to break on a nested subprogram without having to
21868 specify the context. */
21869 list_to_add = &global_symbols;
21873 list_to_add = cu->list_in_scope;
21876 case DW_TAG_inlined_subroutine:
21877 /* SYMBOL_BLOCK_VALUE (sym) will be filled in later by
21879 SYMBOL_ACLASS_INDEX (sym) = LOC_BLOCK;
21880 SYMBOL_INLINED (sym) = 1;
21881 list_to_add = cu->list_in_scope;
21883 case DW_TAG_template_value_param:
21885 /* Fall through. */
21886 case DW_TAG_constant:
21887 case DW_TAG_variable:
21888 case DW_TAG_member:
21889 /* Compilation with minimal debug info may result in
21890 variables with missing type entries. Change the
21891 misleading `void' type to something sensible. */
21892 if (TYPE_CODE (SYMBOL_TYPE (sym)) == TYPE_CODE_VOID)
21893 SYMBOL_TYPE (sym) = objfile_type (objfile)->builtin_int;
21895 attr = dwarf2_attr (die, DW_AT_const_value, cu);
21896 /* In the case of DW_TAG_member, we should only be called for
21897 static const members. */
21898 if (die->tag == DW_TAG_member)
21900 /* dwarf2_add_field uses die_is_declaration,
21901 so we do the same. */
21902 gdb_assert (die_is_declaration (die, cu));
21907 dwarf2_const_value (attr, sym, cu);
21908 attr2 = dwarf2_attr (die, DW_AT_external, cu);
21911 if (attr2 && (DW_UNSND (attr2) != 0))
21912 list_to_add = &global_symbols;
21914 list_to_add = cu->list_in_scope;
21918 attr = dwarf2_attr (die, DW_AT_location, cu);
21921 var_decode_location (attr, sym, cu);
21922 attr2 = dwarf2_attr (die, DW_AT_external, cu);
21924 /* Fortran explicitly imports any global symbols to the local
21925 scope by DW_TAG_common_block. */
21926 if (cu->language == language_fortran && die->parent
21927 && die->parent->tag == DW_TAG_common_block)
21930 if (SYMBOL_CLASS (sym) == LOC_STATIC
21931 && SYMBOL_VALUE_ADDRESS (sym) == 0
21932 && !dwarf2_per_objfile->has_section_at_zero)
21934 /* When a static variable is eliminated by the linker,
21935 the corresponding debug information is not stripped
21936 out, but the variable address is set to null;
21937 do not add such variables into symbol table. */
21939 else if (attr2 && (DW_UNSND (attr2) != 0))
21941 /* Workaround gfortran PR debug/40040 - it uses
21942 DW_AT_location for variables in -fPIC libraries which may
21943 get overriden by other libraries/executable and get
21944 a different address. Resolve it by the minimal symbol
21945 which may come from inferior's executable using copy
21946 relocation. Make this workaround only for gfortran as for
21947 other compilers GDB cannot guess the minimal symbol
21948 Fortran mangling kind. */
21949 if (cu->language == language_fortran && die->parent
21950 && die->parent->tag == DW_TAG_module
21952 && startswith (cu->producer, "GNU Fortran"))
21953 SYMBOL_ACLASS_INDEX (sym) = LOC_UNRESOLVED;
21955 /* A variable with DW_AT_external is never static,
21956 but it may be block-scoped. */
21957 list_to_add = (cu->list_in_scope == &file_symbols
21958 ? &global_symbols : cu->list_in_scope);
21961 list_to_add = cu->list_in_scope;
21965 /* We do not know the address of this symbol.
21966 If it is an external symbol and we have type information
21967 for it, enter the symbol as a LOC_UNRESOLVED symbol.
21968 The address of the variable will then be determined from
21969 the minimal symbol table whenever the variable is
21971 attr2 = dwarf2_attr (die, DW_AT_external, cu);
21973 /* Fortran explicitly imports any global symbols to the local
21974 scope by DW_TAG_common_block. */
21975 if (cu->language == language_fortran && die->parent
21976 && die->parent->tag == DW_TAG_common_block)
21978 /* SYMBOL_CLASS doesn't matter here because
21979 read_common_block is going to reset it. */
21981 list_to_add = cu->list_in_scope;
21983 else if (attr2 && (DW_UNSND (attr2) != 0)
21984 && dwarf2_attr (die, DW_AT_type, cu) != NULL)
21986 /* A variable with DW_AT_external is never static, but it
21987 may be block-scoped. */
21988 list_to_add = (cu->list_in_scope == &file_symbols
21989 ? &global_symbols : cu->list_in_scope);
21991 SYMBOL_ACLASS_INDEX (sym) = LOC_UNRESOLVED;
21993 else if (!die_is_declaration (die, cu))
21995 /* Use the default LOC_OPTIMIZED_OUT class. */
21996 gdb_assert (SYMBOL_CLASS (sym) == LOC_OPTIMIZED_OUT);
21998 list_to_add = cu->list_in_scope;
22002 case DW_TAG_formal_parameter:
22003 /* If we are inside a function, mark this as an argument. If
22004 not, we might be looking at an argument to an inlined function
22005 when we do not have enough information to show inlined frames;
22006 pretend it's a local variable in that case so that the user can
22008 if (context_stack_depth > 0
22009 && context_stack[context_stack_depth - 1].name != NULL)
22010 SYMBOL_IS_ARGUMENT (sym) = 1;
22011 attr = dwarf2_attr (die, DW_AT_location, cu);
22014 var_decode_location (attr, sym, cu);
22016 attr = dwarf2_attr (die, DW_AT_const_value, cu);
22019 dwarf2_const_value (attr, sym, cu);
22022 list_to_add = cu->list_in_scope;
22024 case DW_TAG_unspecified_parameters:
22025 /* From varargs functions; gdb doesn't seem to have any
22026 interest in this information, so just ignore it for now.
22029 case DW_TAG_template_type_param:
22031 /* Fall through. */
22032 case DW_TAG_class_type:
22033 case DW_TAG_interface_type:
22034 case DW_TAG_structure_type:
22035 case DW_TAG_union_type:
22036 case DW_TAG_set_type:
22037 case DW_TAG_enumeration_type:
22038 SYMBOL_ACLASS_INDEX (sym) = LOC_TYPEDEF;
22039 SYMBOL_DOMAIN (sym) = STRUCT_DOMAIN;
22042 /* NOTE: carlton/2003-11-10: C++ class symbols shouldn't
22043 really ever be static objects: otherwise, if you try
22044 to, say, break of a class's method and you're in a file
22045 which doesn't mention that class, it won't work unless
22046 the check for all static symbols in lookup_symbol_aux
22047 saves you. See the OtherFileClass tests in
22048 gdb.c++/namespace.exp. */
22052 list_to_add = (cu->list_in_scope == &file_symbols
22053 && cu->language == language_cplus
22054 ? &global_symbols : cu->list_in_scope);
22056 /* The semantics of C++ state that "struct foo {
22057 ... }" also defines a typedef for "foo". */
22058 if (cu->language == language_cplus
22059 || cu->language == language_ada
22060 || cu->language == language_d
22061 || cu->language == language_rust)
22063 /* The symbol's name is already allocated along
22064 with this objfile, so we don't need to
22065 duplicate it for the type. */
22066 if (TYPE_NAME (SYMBOL_TYPE (sym)) == 0)
22067 TYPE_NAME (SYMBOL_TYPE (sym)) = SYMBOL_SEARCH_NAME (sym);
22072 case DW_TAG_typedef:
22073 SYMBOL_ACLASS_INDEX (sym) = LOC_TYPEDEF;
22074 SYMBOL_DOMAIN (sym) = VAR_DOMAIN;
22075 list_to_add = cu->list_in_scope;
22077 case DW_TAG_base_type:
22078 case DW_TAG_subrange_type:
22079 SYMBOL_ACLASS_INDEX (sym) = LOC_TYPEDEF;
22080 SYMBOL_DOMAIN (sym) = VAR_DOMAIN;
22081 list_to_add = cu->list_in_scope;
22083 case DW_TAG_enumerator:
22084 attr = dwarf2_attr (die, DW_AT_const_value, cu);
22087 dwarf2_const_value (attr, sym, cu);
22090 /* NOTE: carlton/2003-11-10: See comment above in the
22091 DW_TAG_class_type, etc. block. */
22093 list_to_add = (cu->list_in_scope == &file_symbols
22094 && cu->language == language_cplus
22095 ? &global_symbols : cu->list_in_scope);
22098 case DW_TAG_imported_declaration:
22099 case DW_TAG_namespace:
22100 SYMBOL_ACLASS_INDEX (sym) = LOC_TYPEDEF;
22101 list_to_add = &global_symbols;
22103 case DW_TAG_module:
22104 SYMBOL_ACLASS_INDEX (sym) = LOC_TYPEDEF;
22105 SYMBOL_DOMAIN (sym) = MODULE_DOMAIN;
22106 list_to_add = &global_symbols;
22108 case DW_TAG_common_block:
22109 SYMBOL_ACLASS_INDEX (sym) = LOC_COMMON_BLOCK;
22110 SYMBOL_DOMAIN (sym) = COMMON_BLOCK_DOMAIN;
22111 add_symbol_to_list (sym, cu->list_in_scope);
22114 /* Not a tag we recognize. Hopefully we aren't processing
22115 trash data, but since we must specifically ignore things
22116 we don't recognize, there is nothing else we should do at
22118 complaint (&symfile_complaints, _("unsupported tag: '%s'"),
22119 dwarf_tag_name (die->tag));
22125 sym->hash_next = objfile->template_symbols;
22126 objfile->template_symbols = sym;
22127 list_to_add = NULL;
22130 if (list_to_add != NULL)
22131 add_symbol_to_list (sym, list_to_add);
22133 /* For the benefit of old versions of GCC, check for anonymous
22134 namespaces based on the demangled name. */
22135 if (!cu->processing_has_namespace_info
22136 && cu->language == language_cplus)
22137 cp_scan_for_anonymous_namespaces (sym, objfile);
22142 /* Given an attr with a DW_FORM_dataN value in host byte order,
22143 zero-extend it as appropriate for the symbol's type. The DWARF
22144 standard (v4) is not entirely clear about the meaning of using
22145 DW_FORM_dataN for a constant with a signed type, where the type is
22146 wider than the data. The conclusion of a discussion on the DWARF
22147 list was that this is unspecified. We choose to always zero-extend
22148 because that is the interpretation long in use by GCC. */
22151 dwarf2_const_value_data (const struct attribute *attr, struct obstack *obstack,
22152 struct dwarf2_cu *cu, LONGEST *value, int bits)
22154 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
22155 enum bfd_endian byte_order = bfd_big_endian (objfile->obfd) ?
22156 BFD_ENDIAN_BIG : BFD_ENDIAN_LITTLE;
22157 LONGEST l = DW_UNSND (attr);
22159 if (bits < sizeof (*value) * 8)
22161 l &= ((LONGEST) 1 << bits) - 1;
22164 else if (bits == sizeof (*value) * 8)
22168 gdb_byte *bytes = (gdb_byte *) obstack_alloc (obstack, bits / 8);
22169 store_unsigned_integer (bytes, bits / 8, byte_order, l);
22176 /* Read a constant value from an attribute. Either set *VALUE, or if
22177 the value does not fit in *VALUE, set *BYTES - either already
22178 allocated on the objfile obstack, or newly allocated on OBSTACK,
22179 or, set *BATON, if we translated the constant to a location
22183 dwarf2_const_value_attr (const struct attribute *attr, struct type *type,
22184 const char *name, struct obstack *obstack,
22185 struct dwarf2_cu *cu,
22186 LONGEST *value, const gdb_byte **bytes,
22187 struct dwarf2_locexpr_baton **baton)
22189 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
22190 struct comp_unit_head *cu_header = &cu->header;
22191 struct dwarf_block *blk;
22192 enum bfd_endian byte_order = (bfd_big_endian (objfile->obfd) ?
22193 BFD_ENDIAN_BIG : BFD_ENDIAN_LITTLE);
22199 switch (attr->form)
22202 case DW_FORM_GNU_addr_index:
22206 if (TYPE_LENGTH (type) != cu_header->addr_size)
22207 dwarf2_const_value_length_mismatch_complaint (name,
22208 cu_header->addr_size,
22209 TYPE_LENGTH (type));
22210 /* Symbols of this form are reasonably rare, so we just
22211 piggyback on the existing location code rather than writing
22212 a new implementation of symbol_computed_ops. */
22213 *baton = XOBNEW (obstack, struct dwarf2_locexpr_baton);
22214 (*baton)->per_cu = cu->per_cu;
22215 gdb_assert ((*baton)->per_cu);
22217 (*baton)->size = 2 + cu_header->addr_size;
22218 data = (gdb_byte *) obstack_alloc (obstack, (*baton)->size);
22219 (*baton)->data = data;
22221 data[0] = DW_OP_addr;
22222 store_unsigned_integer (&data[1], cu_header->addr_size,
22223 byte_order, DW_ADDR (attr));
22224 data[cu_header->addr_size + 1] = DW_OP_stack_value;
22227 case DW_FORM_string:
22229 case DW_FORM_GNU_str_index:
22230 case DW_FORM_GNU_strp_alt:
22231 /* DW_STRING is already allocated on the objfile obstack, point
22233 *bytes = (const gdb_byte *) DW_STRING (attr);
22235 case DW_FORM_block1:
22236 case DW_FORM_block2:
22237 case DW_FORM_block4:
22238 case DW_FORM_block:
22239 case DW_FORM_exprloc:
22240 case DW_FORM_data16:
22241 blk = DW_BLOCK (attr);
22242 if (TYPE_LENGTH (type) != blk->size)
22243 dwarf2_const_value_length_mismatch_complaint (name, blk->size,
22244 TYPE_LENGTH (type));
22245 *bytes = blk->data;
22248 /* The DW_AT_const_value attributes are supposed to carry the
22249 symbol's value "represented as it would be on the target
22250 architecture." By the time we get here, it's already been
22251 converted to host endianness, so we just need to sign- or
22252 zero-extend it as appropriate. */
22253 case DW_FORM_data1:
22254 *bytes = dwarf2_const_value_data (attr, obstack, cu, value, 8);
22256 case DW_FORM_data2:
22257 *bytes = dwarf2_const_value_data (attr, obstack, cu, value, 16);
22259 case DW_FORM_data4:
22260 *bytes = dwarf2_const_value_data (attr, obstack, cu, value, 32);
22262 case DW_FORM_data8:
22263 *bytes = dwarf2_const_value_data (attr, obstack, cu, value, 64);
22266 case DW_FORM_sdata:
22267 case DW_FORM_implicit_const:
22268 *value = DW_SND (attr);
22271 case DW_FORM_udata:
22272 *value = DW_UNSND (attr);
22276 complaint (&symfile_complaints,
22277 _("unsupported const value attribute form: '%s'"),
22278 dwarf_form_name (attr->form));
22285 /* Copy constant value from an attribute to a symbol. */
22288 dwarf2_const_value (const struct attribute *attr, struct symbol *sym,
22289 struct dwarf2_cu *cu)
22291 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
22293 const gdb_byte *bytes;
22294 struct dwarf2_locexpr_baton *baton;
22296 dwarf2_const_value_attr (attr, SYMBOL_TYPE (sym),
22297 SYMBOL_PRINT_NAME (sym),
22298 &objfile->objfile_obstack, cu,
22299 &value, &bytes, &baton);
22303 SYMBOL_LOCATION_BATON (sym) = baton;
22304 SYMBOL_ACLASS_INDEX (sym) = dwarf2_locexpr_index;
22306 else if (bytes != NULL)
22308 SYMBOL_VALUE_BYTES (sym) = bytes;
22309 SYMBOL_ACLASS_INDEX (sym) = LOC_CONST_BYTES;
22313 SYMBOL_VALUE (sym) = value;
22314 SYMBOL_ACLASS_INDEX (sym) = LOC_CONST;
22318 /* Return the type of the die in question using its DW_AT_type attribute. */
22320 static struct type *
22321 die_type (struct die_info *die, struct dwarf2_cu *cu)
22323 struct attribute *type_attr;
22325 type_attr = dwarf2_attr (die, DW_AT_type, cu);
22328 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
22329 /* A missing DW_AT_type represents a void type. */
22330 return objfile_type (objfile)->builtin_void;
22333 return lookup_die_type (die, type_attr, cu);
22336 /* True iff CU's producer generates GNAT Ada auxiliary information
22337 that allows to find parallel types through that information instead
22338 of having to do expensive parallel lookups by type name. */
22341 need_gnat_info (struct dwarf2_cu *cu)
22343 /* Assume that the Ada compiler was GNAT, which always produces
22344 the auxiliary information. */
22345 return (cu->language == language_ada);
22348 /* Return the auxiliary type of the die in question using its
22349 DW_AT_GNAT_descriptive_type attribute. Returns NULL if the
22350 attribute is not present. */
22352 static struct type *
22353 die_descriptive_type (struct die_info *die, struct dwarf2_cu *cu)
22355 struct attribute *type_attr;
22357 type_attr = dwarf2_attr (die, DW_AT_GNAT_descriptive_type, cu);
22361 return lookup_die_type (die, type_attr, cu);
22364 /* If DIE has a descriptive_type attribute, then set the TYPE's
22365 descriptive type accordingly. */
22368 set_descriptive_type (struct type *type, struct die_info *die,
22369 struct dwarf2_cu *cu)
22371 struct type *descriptive_type = die_descriptive_type (die, cu);
22373 if (descriptive_type)
22375 ALLOCATE_GNAT_AUX_TYPE (type);
22376 TYPE_DESCRIPTIVE_TYPE (type) = descriptive_type;
22380 /* Return the containing type of the die in question using its
22381 DW_AT_containing_type attribute. */
22383 static struct type *
22384 die_containing_type (struct die_info *die, struct dwarf2_cu *cu)
22386 struct attribute *type_attr;
22387 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
22389 type_attr = dwarf2_attr (die, DW_AT_containing_type, cu);
22391 error (_("Dwarf Error: Problem turning containing type into gdb type "
22392 "[in module %s]"), objfile_name (objfile));
22394 return lookup_die_type (die, type_attr, cu);
22397 /* Return an error marker type to use for the ill formed type in DIE/CU. */
22399 static struct type *
22400 build_error_marker_type (struct dwarf2_cu *cu, struct die_info *die)
22402 struct dwarf2_per_objfile *dwarf2_per_objfile
22403 = cu->per_cu->dwarf2_per_objfile;
22404 struct objfile *objfile = dwarf2_per_objfile->objfile;
22405 char *message, *saved;
22407 message = xstrprintf (_("<unknown type in %s, CU %s, DIE %s>"),
22408 objfile_name (objfile),
22409 sect_offset_str (cu->header.sect_off),
22410 sect_offset_str (die->sect_off));
22411 saved = (char *) obstack_copy0 (&objfile->objfile_obstack,
22412 message, strlen (message));
22415 return init_type (objfile, TYPE_CODE_ERROR, 0, saved);
22418 /* Look up the type of DIE in CU using its type attribute ATTR.
22419 ATTR must be one of: DW_AT_type, DW_AT_GNAT_descriptive_type,
22420 DW_AT_containing_type.
22421 If there is no type substitute an error marker. */
22423 static struct type *
22424 lookup_die_type (struct die_info *die, const struct attribute *attr,
22425 struct dwarf2_cu *cu)
22427 struct dwarf2_per_objfile *dwarf2_per_objfile
22428 = cu->per_cu->dwarf2_per_objfile;
22429 struct objfile *objfile = dwarf2_per_objfile->objfile;
22430 struct type *this_type;
22432 gdb_assert (attr->name == DW_AT_type
22433 || attr->name == DW_AT_GNAT_descriptive_type
22434 || attr->name == DW_AT_containing_type);
22436 /* First see if we have it cached. */
22438 if (attr->form == DW_FORM_GNU_ref_alt)
22440 struct dwarf2_per_cu_data *per_cu;
22441 sect_offset sect_off = dwarf2_get_ref_die_offset (attr);
22443 per_cu = dwarf2_find_containing_comp_unit (sect_off, 1,
22444 dwarf2_per_objfile);
22445 this_type = get_die_type_at_offset (sect_off, per_cu);
22447 else if (attr_form_is_ref (attr))
22449 sect_offset sect_off = dwarf2_get_ref_die_offset (attr);
22451 this_type = get_die_type_at_offset (sect_off, cu->per_cu);
22453 else if (attr->form == DW_FORM_ref_sig8)
22455 ULONGEST signature = DW_SIGNATURE (attr);
22457 return get_signatured_type (die, signature, cu);
22461 complaint (&symfile_complaints,
22462 _("Dwarf Error: Bad type attribute %s in DIE"
22463 " at %s [in module %s]"),
22464 dwarf_attr_name (attr->name), sect_offset_str (die->sect_off),
22465 objfile_name (objfile));
22466 return build_error_marker_type (cu, die);
22469 /* If not cached we need to read it in. */
22471 if (this_type == NULL)
22473 struct die_info *type_die = NULL;
22474 struct dwarf2_cu *type_cu = cu;
22476 if (attr_form_is_ref (attr))
22477 type_die = follow_die_ref (die, attr, &type_cu);
22478 if (type_die == NULL)
22479 return build_error_marker_type (cu, die);
22480 /* If we find the type now, it's probably because the type came
22481 from an inter-CU reference and the type's CU got expanded before
22483 this_type = read_type_die (type_die, type_cu);
22486 /* If we still don't have a type use an error marker. */
22488 if (this_type == NULL)
22489 return build_error_marker_type (cu, die);
22494 /* Return the type in DIE, CU.
22495 Returns NULL for invalid types.
22497 This first does a lookup in die_type_hash,
22498 and only reads the die in if necessary.
22500 NOTE: This can be called when reading in partial or full symbols. */
22502 static struct type *
22503 read_type_die (struct die_info *die, struct dwarf2_cu *cu)
22505 struct type *this_type;
22507 this_type = get_die_type (die, cu);
22511 return read_type_die_1 (die, cu);
22514 /* Read the type in DIE, CU.
22515 Returns NULL for invalid types. */
22517 static struct type *
22518 read_type_die_1 (struct die_info *die, struct dwarf2_cu *cu)
22520 struct type *this_type = NULL;
22524 case DW_TAG_class_type:
22525 case DW_TAG_interface_type:
22526 case DW_TAG_structure_type:
22527 case DW_TAG_union_type:
22528 this_type = read_structure_type (die, cu);
22530 case DW_TAG_enumeration_type:
22531 this_type = read_enumeration_type (die, cu);
22533 case DW_TAG_subprogram:
22534 case DW_TAG_subroutine_type:
22535 case DW_TAG_inlined_subroutine:
22536 this_type = read_subroutine_type (die, cu);
22538 case DW_TAG_array_type:
22539 this_type = read_array_type (die, cu);
22541 case DW_TAG_set_type:
22542 this_type = read_set_type (die, cu);
22544 case DW_TAG_pointer_type:
22545 this_type = read_tag_pointer_type (die, cu);
22547 case DW_TAG_ptr_to_member_type:
22548 this_type = read_tag_ptr_to_member_type (die, cu);
22550 case DW_TAG_reference_type:
22551 this_type = read_tag_reference_type (die, cu, TYPE_CODE_REF);
22553 case DW_TAG_rvalue_reference_type:
22554 this_type = read_tag_reference_type (die, cu, TYPE_CODE_RVALUE_REF);
22556 case DW_TAG_const_type:
22557 this_type = read_tag_const_type (die, cu);
22559 case DW_TAG_volatile_type:
22560 this_type = read_tag_volatile_type (die, cu);
22562 case DW_TAG_restrict_type:
22563 this_type = read_tag_restrict_type (die, cu);
22565 case DW_TAG_string_type:
22566 this_type = read_tag_string_type (die, cu);
22568 case DW_TAG_typedef:
22569 this_type = read_typedef (die, cu);
22571 case DW_TAG_subrange_type:
22572 this_type = read_subrange_type (die, cu);
22574 case DW_TAG_base_type:
22575 this_type = read_base_type (die, cu);
22577 case DW_TAG_unspecified_type:
22578 this_type = read_unspecified_type (die, cu);
22580 case DW_TAG_namespace:
22581 this_type = read_namespace_type (die, cu);
22583 case DW_TAG_module:
22584 this_type = read_module_type (die, cu);
22586 case DW_TAG_atomic_type:
22587 this_type = read_tag_atomic_type (die, cu);
22590 complaint (&symfile_complaints,
22591 _("unexpected tag in read_type_die: '%s'"),
22592 dwarf_tag_name (die->tag));
22599 /* See if we can figure out if the class lives in a namespace. We do
22600 this by looking for a member function; its demangled name will
22601 contain namespace info, if there is any.
22602 Return the computed name or NULL.
22603 Space for the result is allocated on the objfile's obstack.
22604 This is the full-die version of guess_partial_die_structure_name.
22605 In this case we know DIE has no useful parent. */
22608 guess_full_die_structure_name (struct die_info *die, struct dwarf2_cu *cu)
22610 struct die_info *spec_die;
22611 struct dwarf2_cu *spec_cu;
22612 struct die_info *child;
22613 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
22616 spec_die = die_specification (die, &spec_cu);
22617 if (spec_die != NULL)
22623 for (child = die->child;
22625 child = child->sibling)
22627 if (child->tag == DW_TAG_subprogram)
22629 const char *linkage_name = dw2_linkage_name (child, cu);
22631 if (linkage_name != NULL)
22634 = language_class_name_from_physname (cu->language_defn,
22638 if (actual_name != NULL)
22640 const char *die_name = dwarf2_name (die, cu);
22642 if (die_name != NULL
22643 && strcmp (die_name, actual_name) != 0)
22645 /* Strip off the class name from the full name.
22646 We want the prefix. */
22647 int die_name_len = strlen (die_name);
22648 int actual_name_len = strlen (actual_name);
22650 /* Test for '::' as a sanity check. */
22651 if (actual_name_len > die_name_len + 2
22652 && actual_name[actual_name_len
22653 - die_name_len - 1] == ':')
22654 name = (char *) obstack_copy0 (
22655 &objfile->per_bfd->storage_obstack,
22656 actual_name, actual_name_len - die_name_len - 2);
22659 xfree (actual_name);
22668 /* GCC might emit a nameless typedef that has a linkage name. Determine the
22669 prefix part in such case. See
22670 http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47510. */
22672 static const char *
22673 anonymous_struct_prefix (struct die_info *die, struct dwarf2_cu *cu)
22675 struct attribute *attr;
22678 if (die->tag != DW_TAG_class_type && die->tag != DW_TAG_interface_type
22679 && die->tag != DW_TAG_structure_type && die->tag != DW_TAG_union_type)
22682 if (dwarf2_string_attr (die, DW_AT_name, cu) != NULL)
22685 attr = dw2_linkage_name_attr (die, cu);
22686 if (attr == NULL || DW_STRING (attr) == NULL)
22689 /* dwarf2_name had to be already called. */
22690 gdb_assert (DW_STRING_IS_CANONICAL (attr));
22692 /* Strip the base name, keep any leading namespaces/classes. */
22693 base = strrchr (DW_STRING (attr), ':');
22694 if (base == NULL || base == DW_STRING (attr) || base[-1] != ':')
22697 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
22698 return (char *) obstack_copy0 (&objfile->per_bfd->storage_obstack,
22700 &base[-1] - DW_STRING (attr));
22703 /* Return the name of the namespace/class that DIE is defined within,
22704 or "" if we can't tell. The caller should not xfree the result.
22706 For example, if we're within the method foo() in the following
22716 then determine_prefix on foo's die will return "N::C". */
22718 static const char *
22719 determine_prefix (struct die_info *die, struct dwarf2_cu *cu)
22721 struct dwarf2_per_objfile *dwarf2_per_objfile
22722 = cu->per_cu->dwarf2_per_objfile;
22723 struct die_info *parent, *spec_die;
22724 struct dwarf2_cu *spec_cu;
22725 struct type *parent_type;
22726 const char *retval;
22728 if (cu->language != language_cplus
22729 && cu->language != language_fortran && cu->language != language_d
22730 && cu->language != language_rust)
22733 retval = anonymous_struct_prefix (die, cu);
22737 /* We have to be careful in the presence of DW_AT_specification.
22738 For example, with GCC 3.4, given the code
22742 // Definition of N::foo.
22746 then we'll have a tree of DIEs like this:
22748 1: DW_TAG_compile_unit
22749 2: DW_TAG_namespace // N
22750 3: DW_TAG_subprogram // declaration of N::foo
22751 4: DW_TAG_subprogram // definition of N::foo
22752 DW_AT_specification // refers to die #3
22754 Thus, when processing die #4, we have to pretend that we're in
22755 the context of its DW_AT_specification, namely the contex of die
22758 spec_die = die_specification (die, &spec_cu);
22759 if (spec_die == NULL)
22760 parent = die->parent;
22763 parent = spec_die->parent;
22767 if (parent == NULL)
22769 else if (parent->building_fullname)
22772 const char *parent_name;
22774 /* It has been seen on RealView 2.2 built binaries,
22775 DW_TAG_template_type_param types actually _defined_ as
22776 children of the parent class:
22779 template class <class Enum> Class{};
22780 Class<enum E> class_e;
22782 1: DW_TAG_class_type (Class)
22783 2: DW_TAG_enumeration_type (E)
22784 3: DW_TAG_enumerator (enum1:0)
22785 3: DW_TAG_enumerator (enum2:1)
22787 2: DW_TAG_template_type_param
22788 DW_AT_type DW_FORM_ref_udata (E)
22790 Besides being broken debug info, it can put GDB into an
22791 infinite loop. Consider:
22793 When we're building the full name for Class<E>, we'll start
22794 at Class, and go look over its template type parameters,
22795 finding E. We'll then try to build the full name of E, and
22796 reach here. We're now trying to build the full name of E,
22797 and look over the parent DIE for containing scope. In the
22798 broken case, if we followed the parent DIE of E, we'd again
22799 find Class, and once again go look at its template type
22800 arguments, etc., etc. Simply don't consider such parent die
22801 as source-level parent of this die (it can't be, the language
22802 doesn't allow it), and break the loop here. */
22803 name = dwarf2_name (die, cu);
22804 parent_name = dwarf2_name (parent, cu);
22805 complaint (&symfile_complaints,
22806 _("template param type '%s' defined within parent '%s'"),
22807 name ? name : "<unknown>",
22808 parent_name ? parent_name : "<unknown>");
22812 switch (parent->tag)
22814 case DW_TAG_namespace:
22815 parent_type = read_type_die (parent, cu);
22816 /* GCC 4.0 and 4.1 had a bug (PR c++/28460) where they generated bogus
22817 DW_TAG_namespace DIEs with a name of "::" for the global namespace.
22818 Work around this problem here. */
22819 if (cu->language == language_cplus
22820 && strcmp (TYPE_TAG_NAME (parent_type), "::") == 0)
22822 /* We give a name to even anonymous namespaces. */
22823 return TYPE_TAG_NAME (parent_type);
22824 case DW_TAG_class_type:
22825 case DW_TAG_interface_type:
22826 case DW_TAG_structure_type:
22827 case DW_TAG_union_type:
22828 case DW_TAG_module:
22829 parent_type = read_type_die (parent, cu);
22830 if (TYPE_TAG_NAME (parent_type) != NULL)
22831 return TYPE_TAG_NAME (parent_type);
22833 /* An anonymous structure is only allowed non-static data
22834 members; no typedefs, no member functions, et cetera.
22835 So it does not need a prefix. */
22837 case DW_TAG_compile_unit:
22838 case DW_TAG_partial_unit:
22839 /* gcc-4.5 -gdwarf-4 can drop the enclosing namespace. Cope. */
22840 if (cu->language == language_cplus
22841 && !VEC_empty (dwarf2_section_info_def, dwarf2_per_objfile->types)
22842 && die->child != NULL
22843 && (die->tag == DW_TAG_class_type
22844 || die->tag == DW_TAG_structure_type
22845 || die->tag == DW_TAG_union_type))
22847 char *name = guess_full_die_structure_name (die, cu);
22852 case DW_TAG_enumeration_type:
22853 parent_type = read_type_die (parent, cu);
22854 if (TYPE_DECLARED_CLASS (parent_type))
22856 if (TYPE_TAG_NAME (parent_type) != NULL)
22857 return TYPE_TAG_NAME (parent_type);
22860 /* Fall through. */
22862 return determine_prefix (parent, cu);
22866 /* Return a newly-allocated string formed by concatenating PREFIX and SUFFIX
22867 with appropriate separator. If PREFIX or SUFFIX is NULL or empty, then
22868 simply copy the SUFFIX or PREFIX, respectively. If OBS is non-null, perform
22869 an obconcat, otherwise allocate storage for the result. The CU argument is
22870 used to determine the language and hence, the appropriate separator. */
22872 #define MAX_SEP_LEN 7 /* strlen ("__") + strlen ("_MOD_") */
22875 typename_concat (struct obstack *obs, const char *prefix, const char *suffix,
22876 int physname, struct dwarf2_cu *cu)
22878 const char *lead = "";
22881 if (suffix == NULL || suffix[0] == '\0'
22882 || prefix == NULL || prefix[0] == '\0')
22884 else if (cu->language == language_d)
22886 /* For D, the 'main' function could be defined in any module, but it
22887 should never be prefixed. */
22888 if (strcmp (suffix, "D main") == 0)
22896 else if (cu->language == language_fortran && physname)
22898 /* This is gfortran specific mangling. Normally DW_AT_linkage_name or
22899 DW_AT_MIPS_linkage_name is preferred and used instead. */
22907 if (prefix == NULL)
22909 if (suffix == NULL)
22916 xmalloc (strlen (prefix) + MAX_SEP_LEN + strlen (suffix) + 1));
22918 strcpy (retval, lead);
22919 strcat (retval, prefix);
22920 strcat (retval, sep);
22921 strcat (retval, suffix);
22926 /* We have an obstack. */
22927 return obconcat (obs, lead, prefix, sep, suffix, (char *) NULL);
22931 /* Return sibling of die, NULL if no sibling. */
22933 static struct die_info *
22934 sibling_die (struct die_info *die)
22936 return die->sibling;
22939 /* Get name of a die, return NULL if not found. */
22941 static const char *
22942 dwarf2_canonicalize_name (const char *name, struct dwarf2_cu *cu,
22943 struct obstack *obstack)
22945 if (name && cu->language == language_cplus)
22947 std::string canon_name = cp_canonicalize_string (name);
22949 if (!canon_name.empty ())
22951 if (canon_name != name)
22952 name = (const char *) obstack_copy0 (obstack,
22953 canon_name.c_str (),
22954 canon_name.length ());
22961 /* Get name of a die, return NULL if not found.
22962 Anonymous namespaces are converted to their magic string. */
22964 static const char *
22965 dwarf2_name (struct die_info *die, struct dwarf2_cu *cu)
22967 struct attribute *attr;
22968 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
22970 attr = dwarf2_attr (die, DW_AT_name, cu);
22971 if ((!attr || !DW_STRING (attr))
22972 && die->tag != DW_TAG_namespace
22973 && die->tag != DW_TAG_class_type
22974 && die->tag != DW_TAG_interface_type
22975 && die->tag != DW_TAG_structure_type
22976 && die->tag != DW_TAG_union_type)
22981 case DW_TAG_compile_unit:
22982 case DW_TAG_partial_unit:
22983 /* Compilation units have a DW_AT_name that is a filename, not
22984 a source language identifier. */
22985 case DW_TAG_enumeration_type:
22986 case DW_TAG_enumerator:
22987 /* These tags always have simple identifiers already; no need
22988 to canonicalize them. */
22989 return DW_STRING (attr);
22991 case DW_TAG_namespace:
22992 if (attr != NULL && DW_STRING (attr) != NULL)
22993 return DW_STRING (attr);
22994 return CP_ANONYMOUS_NAMESPACE_STR;
22996 case DW_TAG_class_type:
22997 case DW_TAG_interface_type:
22998 case DW_TAG_structure_type:
22999 case DW_TAG_union_type:
23000 /* Some GCC versions emit spurious DW_AT_name attributes for unnamed
23001 structures or unions. These were of the form "._%d" in GCC 4.1,
23002 or simply "<anonymous struct>" or "<anonymous union>" in GCC 4.3
23003 and GCC 4.4. We work around this problem by ignoring these. */
23004 if (attr && DW_STRING (attr)
23005 && (startswith (DW_STRING (attr), "._")
23006 || startswith (DW_STRING (attr), "<anonymous")))
23009 /* GCC might emit a nameless typedef that has a linkage name. See
23010 http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47510. */
23011 if (!attr || DW_STRING (attr) == NULL)
23013 char *demangled = NULL;
23015 attr = dw2_linkage_name_attr (die, cu);
23016 if (attr == NULL || DW_STRING (attr) == NULL)
23019 /* Avoid demangling DW_STRING (attr) the second time on a second
23020 call for the same DIE. */
23021 if (!DW_STRING_IS_CANONICAL (attr))
23022 demangled = gdb_demangle (DW_STRING (attr), DMGL_TYPES);
23028 /* FIXME: we already did this for the partial symbol... */
23031 obstack_copy0 (&objfile->per_bfd->storage_obstack,
23032 demangled, strlen (demangled)));
23033 DW_STRING_IS_CANONICAL (attr) = 1;
23036 /* Strip any leading namespaces/classes, keep only the base name.
23037 DW_AT_name for named DIEs does not contain the prefixes. */
23038 base = strrchr (DW_STRING (attr), ':');
23039 if (base && base > DW_STRING (attr) && base[-1] == ':')
23042 return DW_STRING (attr);
23051 if (!DW_STRING_IS_CANONICAL (attr))
23054 = dwarf2_canonicalize_name (DW_STRING (attr), cu,
23055 &objfile->per_bfd->storage_obstack);
23056 DW_STRING_IS_CANONICAL (attr) = 1;
23058 return DW_STRING (attr);
23061 /* Return the die that this die in an extension of, or NULL if there
23062 is none. *EXT_CU is the CU containing DIE on input, and the CU
23063 containing the return value on output. */
23065 static struct die_info *
23066 dwarf2_extension (struct die_info *die, struct dwarf2_cu **ext_cu)
23068 struct attribute *attr;
23070 attr = dwarf2_attr (die, DW_AT_extension, *ext_cu);
23074 return follow_die_ref (die, attr, ext_cu);
23077 /* Convert a DIE tag into its string name. */
23079 static const char *
23080 dwarf_tag_name (unsigned tag)
23082 const char *name = get_DW_TAG_name (tag);
23085 return "DW_TAG_<unknown>";
23090 /* Convert a DWARF attribute code into its string name. */
23092 static const char *
23093 dwarf_attr_name (unsigned attr)
23097 #ifdef MIPS /* collides with DW_AT_HP_block_index */
23098 if (attr == DW_AT_MIPS_fde)
23099 return "DW_AT_MIPS_fde";
23101 if (attr == DW_AT_HP_block_index)
23102 return "DW_AT_HP_block_index";
23105 name = get_DW_AT_name (attr);
23108 return "DW_AT_<unknown>";
23113 /* Convert a DWARF value form code into its string name. */
23115 static const char *
23116 dwarf_form_name (unsigned form)
23118 const char *name = get_DW_FORM_name (form);
23121 return "DW_FORM_<unknown>";
23126 static const char *
23127 dwarf_bool_name (unsigned mybool)
23135 /* Convert a DWARF type code into its string name. */
23137 static const char *
23138 dwarf_type_encoding_name (unsigned enc)
23140 const char *name = get_DW_ATE_name (enc);
23143 return "DW_ATE_<unknown>";
23149 dump_die_shallow (struct ui_file *f, int indent, struct die_info *die)
23153 print_spaces (indent, f);
23154 fprintf_unfiltered (f, "Die: %s (abbrev %d, offset %s)\n",
23155 dwarf_tag_name (die->tag), die->abbrev,
23156 sect_offset_str (die->sect_off));
23158 if (die->parent != NULL)
23160 print_spaces (indent, f);
23161 fprintf_unfiltered (f, " parent at offset: %s\n",
23162 sect_offset_str (die->parent->sect_off));
23165 print_spaces (indent, f);
23166 fprintf_unfiltered (f, " has children: %s\n",
23167 dwarf_bool_name (die->child != NULL));
23169 print_spaces (indent, f);
23170 fprintf_unfiltered (f, " attributes:\n");
23172 for (i = 0; i < die->num_attrs; ++i)
23174 print_spaces (indent, f);
23175 fprintf_unfiltered (f, " %s (%s) ",
23176 dwarf_attr_name (die->attrs[i].name),
23177 dwarf_form_name (die->attrs[i].form));
23179 switch (die->attrs[i].form)
23182 case DW_FORM_GNU_addr_index:
23183 fprintf_unfiltered (f, "address: ");
23184 fputs_filtered (hex_string (DW_ADDR (&die->attrs[i])), f);
23186 case DW_FORM_block2:
23187 case DW_FORM_block4:
23188 case DW_FORM_block:
23189 case DW_FORM_block1:
23190 fprintf_unfiltered (f, "block: size %s",
23191 pulongest (DW_BLOCK (&die->attrs[i])->size));
23193 case DW_FORM_exprloc:
23194 fprintf_unfiltered (f, "expression: size %s",
23195 pulongest (DW_BLOCK (&die->attrs[i])->size));
23197 case DW_FORM_data16:
23198 fprintf_unfiltered (f, "constant of 16 bytes");
23200 case DW_FORM_ref_addr:
23201 fprintf_unfiltered (f, "ref address: ");
23202 fputs_filtered (hex_string (DW_UNSND (&die->attrs[i])), f);
23204 case DW_FORM_GNU_ref_alt:
23205 fprintf_unfiltered (f, "alt ref address: ");
23206 fputs_filtered (hex_string (DW_UNSND (&die->attrs[i])), f);
23212 case DW_FORM_ref_udata:
23213 fprintf_unfiltered (f, "constant ref: 0x%lx (adjusted)",
23214 (long) (DW_UNSND (&die->attrs[i])));
23216 case DW_FORM_data1:
23217 case DW_FORM_data2:
23218 case DW_FORM_data4:
23219 case DW_FORM_data8:
23220 case DW_FORM_udata:
23221 case DW_FORM_sdata:
23222 fprintf_unfiltered (f, "constant: %s",
23223 pulongest (DW_UNSND (&die->attrs[i])));
23225 case DW_FORM_sec_offset:
23226 fprintf_unfiltered (f, "section offset: %s",
23227 pulongest (DW_UNSND (&die->attrs[i])));
23229 case DW_FORM_ref_sig8:
23230 fprintf_unfiltered (f, "signature: %s",
23231 hex_string (DW_SIGNATURE (&die->attrs[i])));
23233 case DW_FORM_string:
23235 case DW_FORM_line_strp:
23236 case DW_FORM_GNU_str_index:
23237 case DW_FORM_GNU_strp_alt:
23238 fprintf_unfiltered (f, "string: \"%s\" (%s canonicalized)",
23239 DW_STRING (&die->attrs[i])
23240 ? DW_STRING (&die->attrs[i]) : "",
23241 DW_STRING_IS_CANONICAL (&die->attrs[i]) ? "is" : "not");
23244 if (DW_UNSND (&die->attrs[i]))
23245 fprintf_unfiltered (f, "flag: TRUE");
23247 fprintf_unfiltered (f, "flag: FALSE");
23249 case DW_FORM_flag_present:
23250 fprintf_unfiltered (f, "flag: TRUE");
23252 case DW_FORM_indirect:
23253 /* The reader will have reduced the indirect form to
23254 the "base form" so this form should not occur. */
23255 fprintf_unfiltered (f,
23256 "unexpected attribute form: DW_FORM_indirect");
23258 case DW_FORM_implicit_const:
23259 fprintf_unfiltered (f, "constant: %s",
23260 plongest (DW_SND (&die->attrs[i])));
23263 fprintf_unfiltered (f, "unsupported attribute form: %d.",
23264 die->attrs[i].form);
23267 fprintf_unfiltered (f, "\n");
23272 dump_die_for_error (struct die_info *die)
23274 dump_die_shallow (gdb_stderr, 0, die);
23278 dump_die_1 (struct ui_file *f, int level, int max_level, struct die_info *die)
23280 int indent = level * 4;
23282 gdb_assert (die != NULL);
23284 if (level >= max_level)
23287 dump_die_shallow (f, indent, die);
23289 if (die->child != NULL)
23291 print_spaces (indent, f);
23292 fprintf_unfiltered (f, " Children:");
23293 if (level + 1 < max_level)
23295 fprintf_unfiltered (f, "\n");
23296 dump_die_1 (f, level + 1, max_level, die->child);
23300 fprintf_unfiltered (f,
23301 " [not printed, max nesting level reached]\n");
23305 if (die->sibling != NULL && level > 0)
23307 dump_die_1 (f, level, max_level, die->sibling);
23311 /* This is called from the pdie macro in gdbinit.in.
23312 It's not static so gcc will keep a copy callable from gdb. */
23315 dump_die (struct die_info *die, int max_level)
23317 dump_die_1 (gdb_stdlog, 0, max_level, die);
23321 store_in_ref_table (struct die_info *die, struct dwarf2_cu *cu)
23325 slot = htab_find_slot_with_hash (cu->die_hash, die,
23326 to_underlying (die->sect_off),
23332 /* Return DIE offset of ATTR. Return 0 with complaint if ATTR is not of the
23336 dwarf2_get_ref_die_offset (const struct attribute *attr)
23338 if (attr_form_is_ref (attr))
23339 return (sect_offset) DW_UNSND (attr);
23341 complaint (&symfile_complaints,
23342 _("unsupported die ref attribute form: '%s'"),
23343 dwarf_form_name (attr->form));
23347 /* Return the constant value held by ATTR. Return DEFAULT_VALUE if
23348 * the value held by the attribute is not constant. */
23351 dwarf2_get_attr_constant_value (const struct attribute *attr, int default_value)
23353 if (attr->form == DW_FORM_sdata || attr->form == DW_FORM_implicit_const)
23354 return DW_SND (attr);
23355 else if (attr->form == DW_FORM_udata
23356 || attr->form == DW_FORM_data1
23357 || attr->form == DW_FORM_data2
23358 || attr->form == DW_FORM_data4
23359 || attr->form == DW_FORM_data8)
23360 return DW_UNSND (attr);
23363 /* For DW_FORM_data16 see attr_form_is_constant. */
23364 complaint (&symfile_complaints,
23365 _("Attribute value is not a constant (%s)"),
23366 dwarf_form_name (attr->form));
23367 return default_value;
23371 /* Follow reference or signature attribute ATTR of SRC_DIE.
23372 On entry *REF_CU is the CU of SRC_DIE.
23373 On exit *REF_CU is the CU of the result. */
23375 static struct die_info *
23376 follow_die_ref_or_sig (struct die_info *src_die, const struct attribute *attr,
23377 struct dwarf2_cu **ref_cu)
23379 struct die_info *die;
23381 if (attr_form_is_ref (attr))
23382 die = follow_die_ref (src_die, attr, ref_cu);
23383 else if (attr->form == DW_FORM_ref_sig8)
23384 die = follow_die_sig (src_die, attr, ref_cu);
23387 dump_die_for_error (src_die);
23388 error (_("Dwarf Error: Expected reference attribute [in module %s]"),
23389 objfile_name ((*ref_cu)->per_cu->dwarf2_per_objfile->objfile));
23395 /* Follow reference OFFSET.
23396 On entry *REF_CU is the CU of the source die referencing OFFSET.
23397 On exit *REF_CU is the CU of the result.
23398 Returns NULL if OFFSET is invalid. */
23400 static struct die_info *
23401 follow_die_offset (sect_offset sect_off, int offset_in_dwz,
23402 struct dwarf2_cu **ref_cu)
23404 struct die_info temp_die;
23405 struct dwarf2_cu *target_cu, *cu = *ref_cu;
23406 struct dwarf2_per_objfile *dwarf2_per_objfile
23407 = cu->per_cu->dwarf2_per_objfile;
23408 struct objfile *objfile = dwarf2_per_objfile->objfile;
23410 gdb_assert (cu->per_cu != NULL);
23414 if (cu->per_cu->is_debug_types)
23416 /* .debug_types CUs cannot reference anything outside their CU.
23417 If they need to, they have to reference a signatured type via
23418 DW_FORM_ref_sig8. */
23419 if (!offset_in_cu_p (&cu->header, sect_off))
23422 else if (offset_in_dwz != cu->per_cu->is_dwz
23423 || !offset_in_cu_p (&cu->header, sect_off))
23425 struct dwarf2_per_cu_data *per_cu;
23427 per_cu = dwarf2_find_containing_comp_unit (sect_off, offset_in_dwz,
23428 dwarf2_per_objfile);
23430 /* If necessary, add it to the queue and load its DIEs. */
23431 if (maybe_queue_comp_unit (cu, per_cu, cu->language))
23432 load_full_comp_unit (per_cu, cu->language);
23434 target_cu = per_cu->cu;
23436 else if (cu->dies == NULL)
23438 /* We're loading full DIEs during partial symbol reading. */
23439 gdb_assert (dwarf2_per_objfile->reading_partial_symbols);
23440 load_full_comp_unit (cu->per_cu, language_minimal);
23443 *ref_cu = target_cu;
23444 temp_die.sect_off = sect_off;
23445 return (struct die_info *) htab_find_with_hash (target_cu->die_hash,
23447 to_underlying (sect_off));
23450 /* Follow reference attribute ATTR of SRC_DIE.
23451 On entry *REF_CU is the CU of SRC_DIE.
23452 On exit *REF_CU is the CU of the result. */
23454 static struct die_info *
23455 follow_die_ref (struct die_info *src_die, const struct attribute *attr,
23456 struct dwarf2_cu **ref_cu)
23458 sect_offset sect_off = dwarf2_get_ref_die_offset (attr);
23459 struct dwarf2_cu *cu = *ref_cu;
23460 struct die_info *die;
23462 die = follow_die_offset (sect_off,
23463 (attr->form == DW_FORM_GNU_ref_alt
23464 || cu->per_cu->is_dwz),
23467 error (_("Dwarf Error: Cannot find DIE at %s referenced from DIE "
23468 "at %s [in module %s]"),
23469 sect_offset_str (sect_off), sect_offset_str (src_die->sect_off),
23470 objfile_name (cu->per_cu->dwarf2_per_objfile->objfile));
23475 /* Return DWARF block referenced by DW_AT_location of DIE at SECT_OFF at PER_CU.
23476 Returned value is intended for DW_OP_call*. Returned
23477 dwarf2_locexpr_baton->data has lifetime of
23478 PER_CU->DWARF2_PER_OBJFILE->OBJFILE. */
23480 struct dwarf2_locexpr_baton
23481 dwarf2_fetch_die_loc_sect_off (sect_offset sect_off,
23482 struct dwarf2_per_cu_data *per_cu,
23483 CORE_ADDR (*get_frame_pc) (void *baton),
23486 struct dwarf2_cu *cu;
23487 struct die_info *die;
23488 struct attribute *attr;
23489 struct dwarf2_locexpr_baton retval;
23490 struct objfile *objfile = per_cu->dwarf2_per_objfile->objfile;
23491 struct dwarf2_per_objfile *dwarf2_per_objfile
23492 = get_dwarf2_per_objfile (objfile);
23494 if (per_cu->cu == NULL)
23499 /* We shouldn't get here for a dummy CU, but don't crash on the user.
23500 Instead just throw an error, not much else we can do. */
23501 error (_("Dwarf Error: Dummy CU at %s referenced in module %s"),
23502 sect_offset_str (sect_off), objfile_name (objfile));
23505 die = follow_die_offset (sect_off, per_cu->is_dwz, &cu);
23507 error (_("Dwarf Error: Cannot find DIE at %s referenced in module %s"),
23508 sect_offset_str (sect_off), objfile_name (objfile));
23510 attr = dwarf2_attr (die, DW_AT_location, cu);
23513 /* DWARF: "If there is no such attribute, then there is no effect.".
23514 DATA is ignored if SIZE is 0. */
23516 retval.data = NULL;
23519 else if (attr_form_is_section_offset (attr))
23521 struct dwarf2_loclist_baton loclist_baton;
23522 CORE_ADDR pc = (*get_frame_pc) (baton);
23525 fill_in_loclist_baton (cu, &loclist_baton, attr);
23527 retval.data = dwarf2_find_location_expression (&loclist_baton,
23529 retval.size = size;
23533 if (!attr_form_is_block (attr))
23534 error (_("Dwarf Error: DIE at %s referenced in module %s "
23535 "is neither DW_FORM_block* nor DW_FORM_exprloc"),
23536 sect_offset_str (sect_off), objfile_name (objfile));
23538 retval.data = DW_BLOCK (attr)->data;
23539 retval.size = DW_BLOCK (attr)->size;
23541 retval.per_cu = cu->per_cu;
23543 age_cached_comp_units (dwarf2_per_objfile);
23548 /* Like dwarf2_fetch_die_loc_sect_off, but take a CU
23551 struct dwarf2_locexpr_baton
23552 dwarf2_fetch_die_loc_cu_off (cu_offset offset_in_cu,
23553 struct dwarf2_per_cu_data *per_cu,
23554 CORE_ADDR (*get_frame_pc) (void *baton),
23557 sect_offset sect_off = per_cu->sect_off + to_underlying (offset_in_cu);
23559 return dwarf2_fetch_die_loc_sect_off (sect_off, per_cu, get_frame_pc, baton);
23562 /* Write a constant of a given type as target-ordered bytes into
23565 static const gdb_byte *
23566 write_constant_as_bytes (struct obstack *obstack,
23567 enum bfd_endian byte_order,
23574 *len = TYPE_LENGTH (type);
23575 result = (gdb_byte *) obstack_alloc (obstack, *len);
23576 store_unsigned_integer (result, *len, byte_order, value);
23581 /* If the DIE at OFFSET in PER_CU has a DW_AT_const_value, return a
23582 pointer to the constant bytes and set LEN to the length of the
23583 data. If memory is needed, allocate it on OBSTACK. If the DIE
23584 does not have a DW_AT_const_value, return NULL. */
23587 dwarf2_fetch_constant_bytes (sect_offset sect_off,
23588 struct dwarf2_per_cu_data *per_cu,
23589 struct obstack *obstack,
23592 struct dwarf2_cu *cu;
23593 struct die_info *die;
23594 struct attribute *attr;
23595 const gdb_byte *result = NULL;
23598 enum bfd_endian byte_order;
23599 struct objfile *objfile = per_cu->dwarf2_per_objfile->objfile;
23601 if (per_cu->cu == NULL)
23606 /* We shouldn't get here for a dummy CU, but don't crash on the user.
23607 Instead just throw an error, not much else we can do. */
23608 error (_("Dwarf Error: Dummy CU at %s referenced in module %s"),
23609 sect_offset_str (sect_off), objfile_name (objfile));
23612 die = follow_die_offset (sect_off, per_cu->is_dwz, &cu);
23614 error (_("Dwarf Error: Cannot find DIE at %s referenced in module %s"),
23615 sect_offset_str (sect_off), objfile_name (objfile));
23617 attr = dwarf2_attr (die, DW_AT_const_value, cu);
23621 byte_order = (bfd_big_endian (objfile->obfd)
23622 ? BFD_ENDIAN_BIG : BFD_ENDIAN_LITTLE);
23624 switch (attr->form)
23627 case DW_FORM_GNU_addr_index:
23631 *len = cu->header.addr_size;
23632 tem = (gdb_byte *) obstack_alloc (obstack, *len);
23633 store_unsigned_integer (tem, *len, byte_order, DW_ADDR (attr));
23637 case DW_FORM_string:
23639 case DW_FORM_GNU_str_index:
23640 case DW_FORM_GNU_strp_alt:
23641 /* DW_STRING is already allocated on the objfile obstack, point
23643 result = (const gdb_byte *) DW_STRING (attr);
23644 *len = strlen (DW_STRING (attr));
23646 case DW_FORM_block1:
23647 case DW_FORM_block2:
23648 case DW_FORM_block4:
23649 case DW_FORM_block:
23650 case DW_FORM_exprloc:
23651 case DW_FORM_data16:
23652 result = DW_BLOCK (attr)->data;
23653 *len = DW_BLOCK (attr)->size;
23656 /* The DW_AT_const_value attributes are supposed to carry the
23657 symbol's value "represented as it would be on the target
23658 architecture." By the time we get here, it's already been
23659 converted to host endianness, so we just need to sign- or
23660 zero-extend it as appropriate. */
23661 case DW_FORM_data1:
23662 type = die_type (die, cu);
23663 result = dwarf2_const_value_data (attr, obstack, cu, &value, 8);
23664 if (result == NULL)
23665 result = write_constant_as_bytes (obstack, byte_order,
23668 case DW_FORM_data2:
23669 type = die_type (die, cu);
23670 result = dwarf2_const_value_data (attr, obstack, cu, &value, 16);
23671 if (result == NULL)
23672 result = write_constant_as_bytes (obstack, byte_order,
23675 case DW_FORM_data4:
23676 type = die_type (die, cu);
23677 result = dwarf2_const_value_data (attr, obstack, cu, &value, 32);
23678 if (result == NULL)
23679 result = write_constant_as_bytes (obstack, byte_order,
23682 case DW_FORM_data8:
23683 type = die_type (die, cu);
23684 result = dwarf2_const_value_data (attr, obstack, cu, &value, 64);
23685 if (result == NULL)
23686 result = write_constant_as_bytes (obstack, byte_order,
23690 case DW_FORM_sdata:
23691 case DW_FORM_implicit_const:
23692 type = die_type (die, cu);
23693 result = write_constant_as_bytes (obstack, byte_order,
23694 type, DW_SND (attr), len);
23697 case DW_FORM_udata:
23698 type = die_type (die, cu);
23699 result = write_constant_as_bytes (obstack, byte_order,
23700 type, DW_UNSND (attr), len);
23704 complaint (&symfile_complaints,
23705 _("unsupported const value attribute form: '%s'"),
23706 dwarf_form_name (attr->form));
23713 /* Return the type of the die at OFFSET in PER_CU. Return NULL if no
23714 valid type for this die is found. */
23717 dwarf2_fetch_die_type_sect_off (sect_offset sect_off,
23718 struct dwarf2_per_cu_data *per_cu)
23720 struct dwarf2_cu *cu;
23721 struct die_info *die;
23723 if (per_cu->cu == NULL)
23729 die = follow_die_offset (sect_off, per_cu->is_dwz, &cu);
23733 return die_type (die, cu);
23736 /* Return the type of the DIE at DIE_OFFSET in the CU named by
23740 dwarf2_get_die_type (cu_offset die_offset,
23741 struct dwarf2_per_cu_data *per_cu)
23743 sect_offset die_offset_sect = per_cu->sect_off + to_underlying (die_offset);
23744 return get_die_type_at_offset (die_offset_sect, per_cu);
23747 /* Follow type unit SIG_TYPE referenced by SRC_DIE.
23748 On entry *REF_CU is the CU of SRC_DIE.
23749 On exit *REF_CU is the CU of the result.
23750 Returns NULL if the referenced DIE isn't found. */
23752 static struct die_info *
23753 follow_die_sig_1 (struct die_info *src_die, struct signatured_type *sig_type,
23754 struct dwarf2_cu **ref_cu)
23756 struct die_info temp_die;
23757 struct dwarf2_cu *sig_cu;
23758 struct die_info *die;
23760 /* While it might be nice to assert sig_type->type == NULL here,
23761 we can get here for DW_AT_imported_declaration where we need
23762 the DIE not the type. */
23764 /* If necessary, add it to the queue and load its DIEs. */
23766 if (maybe_queue_comp_unit (*ref_cu, &sig_type->per_cu, language_minimal))
23767 read_signatured_type (sig_type);
23769 sig_cu = sig_type->per_cu.cu;
23770 gdb_assert (sig_cu != NULL);
23771 gdb_assert (to_underlying (sig_type->type_offset_in_section) != 0);
23772 temp_die.sect_off = sig_type->type_offset_in_section;
23773 die = (struct die_info *) htab_find_with_hash (sig_cu->die_hash, &temp_die,
23774 to_underlying (temp_die.sect_off));
23777 struct dwarf2_per_objfile *dwarf2_per_objfile
23778 = (*ref_cu)->per_cu->dwarf2_per_objfile;
23780 /* For .gdb_index version 7 keep track of included TUs.
23781 http://sourceware.org/bugzilla/show_bug.cgi?id=15021. */
23782 if (dwarf2_per_objfile->index_table != NULL
23783 && dwarf2_per_objfile->index_table->version <= 7)
23785 VEC_safe_push (dwarf2_per_cu_ptr,
23786 (*ref_cu)->per_cu->imported_symtabs,
23797 /* Follow signatured type referenced by ATTR in SRC_DIE.
23798 On entry *REF_CU is the CU of SRC_DIE.
23799 On exit *REF_CU is the CU of the result.
23800 The result is the DIE of the type.
23801 If the referenced type cannot be found an error is thrown. */
23803 static struct die_info *
23804 follow_die_sig (struct die_info *src_die, const struct attribute *attr,
23805 struct dwarf2_cu **ref_cu)
23807 ULONGEST signature = DW_SIGNATURE (attr);
23808 struct signatured_type *sig_type;
23809 struct die_info *die;
23811 gdb_assert (attr->form == DW_FORM_ref_sig8);
23813 sig_type = lookup_signatured_type (*ref_cu, signature);
23814 /* sig_type will be NULL if the signatured type is missing from
23816 if (sig_type == NULL)
23818 error (_("Dwarf Error: Cannot find signatured DIE %s referenced"
23819 " from DIE at %s [in module %s]"),
23820 hex_string (signature), sect_offset_str (src_die->sect_off),
23821 objfile_name ((*ref_cu)->per_cu->dwarf2_per_objfile->objfile));
23824 die = follow_die_sig_1 (src_die, sig_type, ref_cu);
23827 dump_die_for_error (src_die);
23828 error (_("Dwarf Error: Problem reading signatured DIE %s referenced"
23829 " from DIE at %s [in module %s]"),
23830 hex_string (signature), sect_offset_str (src_die->sect_off),
23831 objfile_name ((*ref_cu)->per_cu->dwarf2_per_objfile->objfile));
23837 /* Get the type specified by SIGNATURE referenced in DIE/CU,
23838 reading in and processing the type unit if necessary. */
23840 static struct type *
23841 get_signatured_type (struct die_info *die, ULONGEST signature,
23842 struct dwarf2_cu *cu)
23844 struct dwarf2_per_objfile *dwarf2_per_objfile
23845 = cu->per_cu->dwarf2_per_objfile;
23846 struct signatured_type *sig_type;
23847 struct dwarf2_cu *type_cu;
23848 struct die_info *type_die;
23851 sig_type = lookup_signatured_type (cu, signature);
23852 /* sig_type will be NULL if the signatured type is missing from
23854 if (sig_type == NULL)
23856 complaint (&symfile_complaints,
23857 _("Dwarf Error: Cannot find signatured DIE %s referenced"
23858 " from DIE at %s [in module %s]"),
23859 hex_string (signature), sect_offset_str (die->sect_off),
23860 objfile_name (dwarf2_per_objfile->objfile));
23861 return build_error_marker_type (cu, die);
23864 /* If we already know the type we're done. */
23865 if (sig_type->type != NULL)
23866 return sig_type->type;
23869 type_die = follow_die_sig_1 (die, sig_type, &type_cu);
23870 if (type_die != NULL)
23872 /* N.B. We need to call get_die_type to ensure only one type for this DIE
23873 is created. This is important, for example, because for c++ classes
23874 we need TYPE_NAME set which is only done by new_symbol. Blech. */
23875 type = read_type_die (type_die, type_cu);
23878 complaint (&symfile_complaints,
23879 _("Dwarf Error: Cannot build signatured type %s"
23880 " referenced from DIE at %s [in module %s]"),
23881 hex_string (signature), sect_offset_str (die->sect_off),
23882 objfile_name (dwarf2_per_objfile->objfile));
23883 type = build_error_marker_type (cu, die);
23888 complaint (&symfile_complaints,
23889 _("Dwarf Error: Problem reading signatured DIE %s referenced"
23890 " from DIE at %s [in module %s]"),
23891 hex_string (signature), sect_offset_str (die->sect_off),
23892 objfile_name (dwarf2_per_objfile->objfile));
23893 type = build_error_marker_type (cu, die);
23895 sig_type->type = type;
23900 /* Get the type specified by the DW_AT_signature ATTR in DIE/CU,
23901 reading in and processing the type unit if necessary. */
23903 static struct type *
23904 get_DW_AT_signature_type (struct die_info *die, const struct attribute *attr,
23905 struct dwarf2_cu *cu) /* ARI: editCase function */
23907 /* Yes, DW_AT_signature can use a non-ref_sig8 reference. */
23908 if (attr_form_is_ref (attr))
23910 struct dwarf2_cu *type_cu = cu;
23911 struct die_info *type_die = follow_die_ref (die, attr, &type_cu);
23913 return read_type_die (type_die, type_cu);
23915 else if (attr->form == DW_FORM_ref_sig8)
23917 return get_signatured_type (die, DW_SIGNATURE (attr), cu);
23921 struct dwarf2_per_objfile *dwarf2_per_objfile
23922 = cu->per_cu->dwarf2_per_objfile;
23924 complaint (&symfile_complaints,
23925 _("Dwarf Error: DW_AT_signature has bad form %s in DIE"
23926 " at %s [in module %s]"),
23927 dwarf_form_name (attr->form), sect_offset_str (die->sect_off),
23928 objfile_name (dwarf2_per_objfile->objfile));
23929 return build_error_marker_type (cu, die);
23933 /* Load the DIEs associated with type unit PER_CU into memory. */
23936 load_full_type_unit (struct dwarf2_per_cu_data *per_cu)
23938 struct signatured_type *sig_type;
23940 /* Caller is responsible for ensuring type_unit_groups don't get here. */
23941 gdb_assert (! IS_TYPE_UNIT_GROUP (per_cu));
23943 /* We have the per_cu, but we need the signatured_type.
23944 Fortunately this is an easy translation. */
23945 gdb_assert (per_cu->is_debug_types);
23946 sig_type = (struct signatured_type *) per_cu;
23948 gdb_assert (per_cu->cu == NULL);
23950 read_signatured_type (sig_type);
23952 gdb_assert (per_cu->cu != NULL);
23955 /* die_reader_func for read_signatured_type.
23956 This is identical to load_full_comp_unit_reader,
23957 but is kept separate for now. */
23960 read_signatured_type_reader (const struct die_reader_specs *reader,
23961 const gdb_byte *info_ptr,
23962 struct die_info *comp_unit_die,
23966 struct dwarf2_cu *cu = reader->cu;
23968 gdb_assert (cu->die_hash == NULL);
23970 htab_create_alloc_ex (cu->header.length / 12,
23974 &cu->comp_unit_obstack,
23975 hashtab_obstack_allocate,
23976 dummy_obstack_deallocate);
23979 comp_unit_die->child = read_die_and_siblings (reader, info_ptr,
23980 &info_ptr, comp_unit_die);
23981 cu->dies = comp_unit_die;
23982 /* comp_unit_die is not stored in die_hash, no need. */
23984 /* We try not to read any attributes in this function, because not
23985 all CUs needed for references have been loaded yet, and symbol
23986 table processing isn't initialized. But we have to set the CU language,
23987 or we won't be able to build types correctly.
23988 Similarly, if we do not read the producer, we can not apply
23989 producer-specific interpretation. */
23990 prepare_one_comp_unit (cu, cu->dies, language_minimal);
23993 /* Read in a signatured type and build its CU and DIEs.
23994 If the type is a stub for the real type in a DWO file,
23995 read in the real type from the DWO file as well. */
23998 read_signatured_type (struct signatured_type *sig_type)
24000 struct dwarf2_per_cu_data *per_cu = &sig_type->per_cu;
24002 gdb_assert (per_cu->is_debug_types);
24003 gdb_assert (per_cu->cu == NULL);
24005 init_cutu_and_read_dies (per_cu, NULL, 0, 1,
24006 read_signatured_type_reader, NULL);
24007 sig_type->per_cu.tu_read = 1;
24010 /* Decode simple location descriptions.
24011 Given a pointer to a dwarf block that defines a location, compute
24012 the location and return the value.
24014 NOTE drow/2003-11-18: This function is called in two situations
24015 now: for the address of static or global variables (partial symbols
24016 only) and for offsets into structures which are expected to be
24017 (more or less) constant. The partial symbol case should go away,
24018 and only the constant case should remain. That will let this
24019 function complain more accurately. A few special modes are allowed
24020 without complaint for global variables (for instance, global
24021 register values and thread-local values).
24023 A location description containing no operations indicates that the
24024 object is optimized out. The return value is 0 for that case.
24025 FIXME drow/2003-11-16: No callers check for this case any more; soon all
24026 callers will only want a very basic result and this can become a
24029 Note that stack[0] is unused except as a default error return. */
24032 decode_locdesc (struct dwarf_block *blk, struct dwarf2_cu *cu)
24034 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
24036 size_t size = blk->size;
24037 const gdb_byte *data = blk->data;
24038 CORE_ADDR stack[64];
24040 unsigned int bytes_read, unsnd;
24046 stack[++stacki] = 0;
24085 stack[++stacki] = op - DW_OP_lit0;
24120 stack[++stacki] = op - DW_OP_reg0;
24122 dwarf2_complex_location_expr_complaint ();
24126 unsnd = read_unsigned_leb128 (NULL, (data + i), &bytes_read);
24128 stack[++stacki] = unsnd;
24130 dwarf2_complex_location_expr_complaint ();
24134 stack[++stacki] = read_address (objfile->obfd, &data[i],
24139 case DW_OP_const1u:
24140 stack[++stacki] = read_1_byte (objfile->obfd, &data[i]);
24144 case DW_OP_const1s:
24145 stack[++stacki] = read_1_signed_byte (objfile->obfd, &data[i]);
24149 case DW_OP_const2u:
24150 stack[++stacki] = read_2_bytes (objfile->obfd, &data[i]);
24154 case DW_OP_const2s:
24155 stack[++stacki] = read_2_signed_bytes (objfile->obfd, &data[i]);
24159 case DW_OP_const4u:
24160 stack[++stacki] = read_4_bytes (objfile->obfd, &data[i]);
24164 case DW_OP_const4s:
24165 stack[++stacki] = read_4_signed_bytes (objfile->obfd, &data[i]);
24169 case DW_OP_const8u:
24170 stack[++stacki] = read_8_bytes (objfile->obfd, &data[i]);
24175 stack[++stacki] = read_unsigned_leb128 (NULL, (data + i),
24181 stack[++stacki] = read_signed_leb128 (NULL, (data + i), &bytes_read);
24186 stack[stacki + 1] = stack[stacki];
24191 stack[stacki - 1] += stack[stacki];
24195 case DW_OP_plus_uconst:
24196 stack[stacki] += read_unsigned_leb128 (NULL, (data + i),
24202 stack[stacki - 1] -= stack[stacki];
24207 /* If we're not the last op, then we definitely can't encode
24208 this using GDB's address_class enum. This is valid for partial
24209 global symbols, although the variable's address will be bogus
24212 dwarf2_complex_location_expr_complaint ();
24215 case DW_OP_GNU_push_tls_address:
24216 case DW_OP_form_tls_address:
24217 /* The top of the stack has the offset from the beginning
24218 of the thread control block at which the variable is located. */
24219 /* Nothing should follow this operator, so the top of stack would
24221 /* This is valid for partial global symbols, but the variable's
24222 address will be bogus in the psymtab. Make it always at least
24223 non-zero to not look as a variable garbage collected by linker
24224 which have DW_OP_addr 0. */
24226 dwarf2_complex_location_expr_complaint ();
24230 case DW_OP_GNU_uninit:
24233 case DW_OP_GNU_addr_index:
24234 case DW_OP_GNU_const_index:
24235 stack[++stacki] = read_addr_index_from_leb128 (cu, &data[i],
24242 const char *name = get_DW_OP_name (op);
24245 complaint (&symfile_complaints, _("unsupported stack op: '%s'"),
24248 complaint (&symfile_complaints, _("unsupported stack op: '%02x'"),
24252 return (stack[stacki]);
24255 /* Enforce maximum stack depth of SIZE-1 to avoid writing
24256 outside of the allocated space. Also enforce minimum>0. */
24257 if (stacki >= ARRAY_SIZE (stack) - 1)
24259 complaint (&symfile_complaints,
24260 _("location description stack overflow"));
24266 complaint (&symfile_complaints,
24267 _("location description stack underflow"));
24271 return (stack[stacki]);
24274 /* memory allocation interface */
24276 static struct dwarf_block *
24277 dwarf_alloc_block (struct dwarf2_cu *cu)
24279 return XOBNEW (&cu->comp_unit_obstack, struct dwarf_block);
24282 static struct die_info *
24283 dwarf_alloc_die (struct dwarf2_cu *cu, int num_attrs)
24285 struct die_info *die;
24286 size_t size = sizeof (struct die_info);
24289 size += (num_attrs - 1) * sizeof (struct attribute);
24291 die = (struct die_info *) obstack_alloc (&cu->comp_unit_obstack, size);
24292 memset (die, 0, sizeof (struct die_info));
24297 /* Macro support. */
24299 /* Return file name relative to the compilation directory of file number I in
24300 *LH's file name table. The result is allocated using xmalloc; the caller is
24301 responsible for freeing it. */
24304 file_file_name (int file, struct line_header *lh)
24306 /* Is the file number a valid index into the line header's file name
24307 table? Remember that file numbers start with one, not zero. */
24308 if (1 <= file && file <= lh->file_names.size ())
24310 const file_entry &fe = lh->file_names[file - 1];
24312 if (!IS_ABSOLUTE_PATH (fe.name))
24314 const char *dir = fe.include_dir (lh);
24316 return concat (dir, SLASH_STRING, fe.name, (char *) NULL);
24318 return xstrdup (fe.name);
24322 /* The compiler produced a bogus file number. We can at least
24323 record the macro definitions made in the file, even if we
24324 won't be able to find the file by name. */
24325 char fake_name[80];
24327 xsnprintf (fake_name, sizeof (fake_name),
24328 "<bad macro file number %d>", file);
24330 complaint (&symfile_complaints,
24331 _("bad file number in macro information (%d)"),
24334 return xstrdup (fake_name);
24338 /* Return the full name of file number I in *LH's file name table.
24339 Use COMP_DIR as the name of the current directory of the
24340 compilation. The result is allocated using xmalloc; the caller is
24341 responsible for freeing it. */
24343 file_full_name (int file, struct line_header *lh, const char *comp_dir)
24345 /* Is the file number a valid index into the line header's file name
24346 table? Remember that file numbers start with one, not zero. */
24347 if (1 <= file && file <= lh->file_names.size ())
24349 char *relative = file_file_name (file, lh);
24351 if (IS_ABSOLUTE_PATH (relative) || comp_dir == NULL)
24353 return reconcat (relative, comp_dir, SLASH_STRING,
24354 relative, (char *) NULL);
24357 return file_file_name (file, lh);
24361 static struct macro_source_file *
24362 macro_start_file (int file, int line,
24363 struct macro_source_file *current_file,
24364 struct line_header *lh)
24366 /* File name relative to the compilation directory of this source file. */
24367 char *file_name = file_file_name (file, lh);
24369 if (! current_file)
24371 /* Note: We don't create a macro table for this compilation unit
24372 at all until we actually get a filename. */
24373 struct macro_table *macro_table = get_macro_table ();
24375 /* If we have no current file, then this must be the start_file
24376 directive for the compilation unit's main source file. */
24377 current_file = macro_set_main (macro_table, file_name);
24378 macro_define_special (macro_table);
24381 current_file = macro_include (current_file, line, file_name);
24385 return current_file;
24388 static const char *
24389 consume_improper_spaces (const char *p, const char *body)
24393 complaint (&symfile_complaints,
24394 _("macro definition contains spaces "
24395 "in formal argument list:\n`%s'"),
24407 parse_macro_definition (struct macro_source_file *file, int line,
24412 /* The body string takes one of two forms. For object-like macro
24413 definitions, it should be:
24415 <macro name> " " <definition>
24417 For function-like macro definitions, it should be:
24419 <macro name> "() " <definition>
24421 <macro name> "(" <arg name> ( "," <arg name> ) * ") " <definition>
24423 Spaces may appear only where explicitly indicated, and in the
24426 The Dwarf 2 spec says that an object-like macro's name is always
24427 followed by a space, but versions of GCC around March 2002 omit
24428 the space when the macro's definition is the empty string.
24430 The Dwarf 2 spec says that there should be no spaces between the
24431 formal arguments in a function-like macro's formal argument list,
24432 but versions of GCC around March 2002 include spaces after the
24436 /* Find the extent of the macro name. The macro name is terminated
24437 by either a space or null character (for an object-like macro) or
24438 an opening paren (for a function-like macro). */
24439 for (p = body; *p; p++)
24440 if (*p == ' ' || *p == '(')
24443 if (*p == ' ' || *p == '\0')
24445 /* It's an object-like macro. */
24446 int name_len = p - body;
24447 char *name = savestring (body, name_len);
24448 const char *replacement;
24451 replacement = body + name_len + 1;
24454 dwarf2_macro_malformed_definition_complaint (body);
24455 replacement = body + name_len;
24458 macro_define_object (file, line, name, replacement);
24462 else if (*p == '(')
24464 /* It's a function-like macro. */
24465 char *name = savestring (body, p - body);
24468 char **argv = XNEWVEC (char *, argv_size);
24472 p = consume_improper_spaces (p, body);
24474 /* Parse the formal argument list. */
24475 while (*p && *p != ')')
24477 /* Find the extent of the current argument name. */
24478 const char *arg_start = p;
24480 while (*p && *p != ',' && *p != ')' && *p != ' ')
24483 if (! *p || p == arg_start)
24484 dwarf2_macro_malformed_definition_complaint (body);
24487 /* Make sure argv has room for the new argument. */
24488 if (argc >= argv_size)
24491 argv = XRESIZEVEC (char *, argv, argv_size);
24494 argv[argc++] = savestring (arg_start, p - arg_start);
24497 p = consume_improper_spaces (p, body);
24499 /* Consume the comma, if present. */
24504 p = consume_improper_spaces (p, body);
24513 /* Perfectly formed definition, no complaints. */
24514 macro_define_function (file, line, name,
24515 argc, (const char **) argv,
24517 else if (*p == '\0')
24519 /* Complain, but do define it. */
24520 dwarf2_macro_malformed_definition_complaint (body);
24521 macro_define_function (file, line, name,
24522 argc, (const char **) argv,
24526 /* Just complain. */
24527 dwarf2_macro_malformed_definition_complaint (body);
24530 /* Just complain. */
24531 dwarf2_macro_malformed_definition_complaint (body);
24537 for (i = 0; i < argc; i++)
24543 dwarf2_macro_malformed_definition_complaint (body);
24546 /* Skip some bytes from BYTES according to the form given in FORM.
24547 Returns the new pointer. */
24549 static const gdb_byte *
24550 skip_form_bytes (bfd *abfd, const gdb_byte *bytes, const gdb_byte *buffer_end,
24551 enum dwarf_form form,
24552 unsigned int offset_size,
24553 struct dwarf2_section_info *section)
24555 unsigned int bytes_read;
24559 case DW_FORM_data1:
24564 case DW_FORM_data2:
24568 case DW_FORM_data4:
24572 case DW_FORM_data8:
24576 case DW_FORM_data16:
24580 case DW_FORM_string:
24581 read_direct_string (abfd, bytes, &bytes_read);
24582 bytes += bytes_read;
24585 case DW_FORM_sec_offset:
24587 case DW_FORM_GNU_strp_alt:
24588 bytes += offset_size;
24591 case DW_FORM_block:
24592 bytes += read_unsigned_leb128 (abfd, bytes, &bytes_read);
24593 bytes += bytes_read;
24596 case DW_FORM_block1:
24597 bytes += 1 + read_1_byte (abfd, bytes);
24599 case DW_FORM_block2:
24600 bytes += 2 + read_2_bytes (abfd, bytes);
24602 case DW_FORM_block4:
24603 bytes += 4 + read_4_bytes (abfd, bytes);
24606 case DW_FORM_sdata:
24607 case DW_FORM_udata:
24608 case DW_FORM_GNU_addr_index:
24609 case DW_FORM_GNU_str_index:
24610 bytes = gdb_skip_leb128 (bytes, buffer_end);
24613 dwarf2_section_buffer_overflow_complaint (section);
24618 case DW_FORM_implicit_const:
24623 complaint (&symfile_complaints,
24624 _("invalid form 0x%x in `%s'"),
24625 form, get_section_name (section));
24633 /* A helper for dwarf_decode_macros that handles skipping an unknown
24634 opcode. Returns an updated pointer to the macro data buffer; or,
24635 on error, issues a complaint and returns NULL. */
24637 static const gdb_byte *
24638 skip_unknown_opcode (unsigned int opcode,
24639 const gdb_byte **opcode_definitions,
24640 const gdb_byte *mac_ptr, const gdb_byte *mac_end,
24642 unsigned int offset_size,
24643 struct dwarf2_section_info *section)
24645 unsigned int bytes_read, i;
24647 const gdb_byte *defn;
24649 if (opcode_definitions[opcode] == NULL)
24651 complaint (&symfile_complaints,
24652 _("unrecognized DW_MACFINO opcode 0x%x"),
24657 defn = opcode_definitions[opcode];
24658 arg = read_unsigned_leb128 (abfd, defn, &bytes_read);
24659 defn += bytes_read;
24661 for (i = 0; i < arg; ++i)
24663 mac_ptr = skip_form_bytes (abfd, mac_ptr, mac_end,
24664 (enum dwarf_form) defn[i], offset_size,
24666 if (mac_ptr == NULL)
24668 /* skip_form_bytes already issued the complaint. */
24676 /* A helper function which parses the header of a macro section.
24677 If the macro section is the extended (for now called "GNU") type,
24678 then this updates *OFFSET_SIZE. Returns a pointer to just after
24679 the header, or issues a complaint and returns NULL on error. */
24681 static const gdb_byte *
24682 dwarf_parse_macro_header (const gdb_byte **opcode_definitions,
24684 const gdb_byte *mac_ptr,
24685 unsigned int *offset_size,
24686 int section_is_gnu)
24688 memset (opcode_definitions, 0, 256 * sizeof (gdb_byte *));
24690 if (section_is_gnu)
24692 unsigned int version, flags;
24694 version = read_2_bytes (abfd, mac_ptr);
24695 if (version != 4 && version != 5)
24697 complaint (&symfile_complaints,
24698 _("unrecognized version `%d' in .debug_macro section"),
24704 flags = read_1_byte (abfd, mac_ptr);
24706 *offset_size = (flags & 1) ? 8 : 4;
24708 if ((flags & 2) != 0)
24709 /* We don't need the line table offset. */
24710 mac_ptr += *offset_size;
24712 /* Vendor opcode descriptions. */
24713 if ((flags & 4) != 0)
24715 unsigned int i, count;
24717 count = read_1_byte (abfd, mac_ptr);
24719 for (i = 0; i < count; ++i)
24721 unsigned int opcode, bytes_read;
24724 opcode = read_1_byte (abfd, mac_ptr);
24726 opcode_definitions[opcode] = mac_ptr;
24727 arg = read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
24728 mac_ptr += bytes_read;
24737 /* A helper for dwarf_decode_macros that handles the GNU extensions,
24738 including DW_MACRO_import. */
24741 dwarf_decode_macro_bytes (struct dwarf2_per_objfile *dwarf2_per_objfile,
24743 const gdb_byte *mac_ptr, const gdb_byte *mac_end,
24744 struct macro_source_file *current_file,
24745 struct line_header *lh,
24746 struct dwarf2_section_info *section,
24747 int section_is_gnu, int section_is_dwz,
24748 unsigned int offset_size,
24749 htab_t include_hash)
24751 struct objfile *objfile = dwarf2_per_objfile->objfile;
24752 enum dwarf_macro_record_type macinfo_type;
24753 int at_commandline;
24754 const gdb_byte *opcode_definitions[256];
24756 mac_ptr = dwarf_parse_macro_header (opcode_definitions, abfd, mac_ptr,
24757 &offset_size, section_is_gnu);
24758 if (mac_ptr == NULL)
24760 /* We already issued a complaint. */
24764 /* Determines if GDB is still before first DW_MACINFO_start_file. If true
24765 GDB is still reading the definitions from command line. First
24766 DW_MACINFO_start_file will need to be ignored as it was already executed
24767 to create CURRENT_FILE for the main source holding also the command line
24768 definitions. On first met DW_MACINFO_start_file this flag is reset to
24769 normally execute all the remaining DW_MACINFO_start_file macinfos. */
24771 at_commandline = 1;
24775 /* Do we at least have room for a macinfo type byte? */
24776 if (mac_ptr >= mac_end)
24778 dwarf2_section_buffer_overflow_complaint (section);
24782 macinfo_type = (enum dwarf_macro_record_type) read_1_byte (abfd, mac_ptr);
24785 /* Note that we rely on the fact that the corresponding GNU and
24786 DWARF constants are the same. */
24788 DIAGNOSTIC_IGNORE_SWITCH_DIFFERENT_ENUM_TYPES
24789 switch (macinfo_type)
24791 /* A zero macinfo type indicates the end of the macro
24796 case DW_MACRO_define:
24797 case DW_MACRO_undef:
24798 case DW_MACRO_define_strp:
24799 case DW_MACRO_undef_strp:
24800 case DW_MACRO_define_sup:
24801 case DW_MACRO_undef_sup:
24803 unsigned int bytes_read;
24808 line = read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
24809 mac_ptr += bytes_read;
24811 if (macinfo_type == DW_MACRO_define
24812 || macinfo_type == DW_MACRO_undef)
24814 body = read_direct_string (abfd, mac_ptr, &bytes_read);
24815 mac_ptr += bytes_read;
24819 LONGEST str_offset;
24821 str_offset = read_offset_1 (abfd, mac_ptr, offset_size);
24822 mac_ptr += offset_size;
24824 if (macinfo_type == DW_MACRO_define_sup
24825 || macinfo_type == DW_MACRO_undef_sup
24828 struct dwz_file *dwz
24829 = dwarf2_get_dwz_file (dwarf2_per_objfile);
24831 body = read_indirect_string_from_dwz (objfile,
24835 body = read_indirect_string_at_offset (dwarf2_per_objfile,
24839 is_define = (macinfo_type == DW_MACRO_define
24840 || macinfo_type == DW_MACRO_define_strp
24841 || macinfo_type == DW_MACRO_define_sup);
24842 if (! current_file)
24844 /* DWARF violation as no main source is present. */
24845 complaint (&symfile_complaints,
24846 _("debug info with no main source gives macro %s "
24848 is_define ? _("definition") : _("undefinition"),
24852 if ((line == 0 && !at_commandline)
24853 || (line != 0 && at_commandline))
24854 complaint (&symfile_complaints,
24855 _("debug info gives %s macro %s with %s line %d: %s"),
24856 at_commandline ? _("command-line") : _("in-file"),
24857 is_define ? _("definition") : _("undefinition"),
24858 line == 0 ? _("zero") : _("non-zero"), line, body);
24861 parse_macro_definition (current_file, line, body);
24864 gdb_assert (macinfo_type == DW_MACRO_undef
24865 || macinfo_type == DW_MACRO_undef_strp
24866 || macinfo_type == DW_MACRO_undef_sup);
24867 macro_undef (current_file, line, body);
24872 case DW_MACRO_start_file:
24874 unsigned int bytes_read;
24877 line = read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
24878 mac_ptr += bytes_read;
24879 file = read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
24880 mac_ptr += bytes_read;
24882 if ((line == 0 && !at_commandline)
24883 || (line != 0 && at_commandline))
24884 complaint (&symfile_complaints,
24885 _("debug info gives source %d included "
24886 "from %s at %s line %d"),
24887 file, at_commandline ? _("command-line") : _("file"),
24888 line == 0 ? _("zero") : _("non-zero"), line);
24890 if (at_commandline)
24892 /* This DW_MACRO_start_file was executed in the
24894 at_commandline = 0;
24897 current_file = macro_start_file (file, line, current_file, lh);
24901 case DW_MACRO_end_file:
24902 if (! current_file)
24903 complaint (&symfile_complaints,
24904 _("macro debug info has an unmatched "
24905 "`close_file' directive"));
24908 current_file = current_file->included_by;
24909 if (! current_file)
24911 enum dwarf_macro_record_type next_type;
24913 /* GCC circa March 2002 doesn't produce the zero
24914 type byte marking the end of the compilation
24915 unit. Complain if it's not there, but exit no
24918 /* Do we at least have room for a macinfo type byte? */
24919 if (mac_ptr >= mac_end)
24921 dwarf2_section_buffer_overflow_complaint (section);
24925 /* We don't increment mac_ptr here, so this is just
24928 = (enum dwarf_macro_record_type) read_1_byte (abfd,
24930 if (next_type != 0)
24931 complaint (&symfile_complaints,
24932 _("no terminating 0-type entry for "
24933 "macros in `.debug_macinfo' section"));
24940 case DW_MACRO_import:
24941 case DW_MACRO_import_sup:
24945 bfd *include_bfd = abfd;
24946 struct dwarf2_section_info *include_section = section;
24947 const gdb_byte *include_mac_end = mac_end;
24948 int is_dwz = section_is_dwz;
24949 const gdb_byte *new_mac_ptr;
24951 offset = read_offset_1 (abfd, mac_ptr, offset_size);
24952 mac_ptr += offset_size;
24954 if (macinfo_type == DW_MACRO_import_sup)
24956 struct dwz_file *dwz = dwarf2_get_dwz_file (dwarf2_per_objfile);
24958 dwarf2_read_section (objfile, &dwz->macro);
24960 include_section = &dwz->macro;
24961 include_bfd = get_section_bfd_owner (include_section);
24962 include_mac_end = dwz->macro.buffer + dwz->macro.size;
24966 new_mac_ptr = include_section->buffer + offset;
24967 slot = htab_find_slot (include_hash, new_mac_ptr, INSERT);
24971 /* This has actually happened; see
24972 http://sourceware.org/bugzilla/show_bug.cgi?id=13568. */
24973 complaint (&symfile_complaints,
24974 _("recursive DW_MACRO_import in "
24975 ".debug_macro section"));
24979 *slot = (void *) new_mac_ptr;
24981 dwarf_decode_macro_bytes (dwarf2_per_objfile,
24982 include_bfd, new_mac_ptr,
24983 include_mac_end, current_file, lh,
24984 section, section_is_gnu, is_dwz,
24985 offset_size, include_hash);
24987 htab_remove_elt (include_hash, (void *) new_mac_ptr);
24992 case DW_MACINFO_vendor_ext:
24993 if (!section_is_gnu)
24995 unsigned int bytes_read;
24997 /* This reads the constant, but since we don't recognize
24998 any vendor extensions, we ignore it. */
24999 read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
25000 mac_ptr += bytes_read;
25001 read_direct_string (abfd, mac_ptr, &bytes_read);
25002 mac_ptr += bytes_read;
25004 /* We don't recognize any vendor extensions. */
25010 mac_ptr = skip_unknown_opcode (macinfo_type, opcode_definitions,
25011 mac_ptr, mac_end, abfd, offset_size,
25013 if (mac_ptr == NULL)
25018 } while (macinfo_type != 0);
25022 dwarf_decode_macros (struct dwarf2_cu *cu, unsigned int offset,
25023 int section_is_gnu)
25025 struct dwarf2_per_objfile *dwarf2_per_objfile
25026 = cu->per_cu->dwarf2_per_objfile;
25027 struct objfile *objfile = dwarf2_per_objfile->objfile;
25028 struct line_header *lh = cu->line_header;
25030 const gdb_byte *mac_ptr, *mac_end;
25031 struct macro_source_file *current_file = 0;
25032 enum dwarf_macro_record_type macinfo_type;
25033 unsigned int offset_size = cu->header.offset_size;
25034 const gdb_byte *opcode_definitions[256];
25036 struct dwarf2_section_info *section;
25037 const char *section_name;
25039 if (cu->dwo_unit != NULL)
25041 if (section_is_gnu)
25043 section = &cu->dwo_unit->dwo_file->sections.macro;
25044 section_name = ".debug_macro.dwo";
25048 section = &cu->dwo_unit->dwo_file->sections.macinfo;
25049 section_name = ".debug_macinfo.dwo";
25054 if (section_is_gnu)
25056 section = &dwarf2_per_objfile->macro;
25057 section_name = ".debug_macro";
25061 section = &dwarf2_per_objfile->macinfo;
25062 section_name = ".debug_macinfo";
25066 dwarf2_read_section (objfile, section);
25067 if (section->buffer == NULL)
25069 complaint (&symfile_complaints, _("missing %s section"), section_name);
25072 abfd = get_section_bfd_owner (section);
25074 /* First pass: Find the name of the base filename.
25075 This filename is needed in order to process all macros whose definition
25076 (or undefinition) comes from the command line. These macros are defined
25077 before the first DW_MACINFO_start_file entry, and yet still need to be
25078 associated to the base file.
25080 To determine the base file name, we scan the macro definitions until we
25081 reach the first DW_MACINFO_start_file entry. We then initialize
25082 CURRENT_FILE accordingly so that any macro definition found before the
25083 first DW_MACINFO_start_file can still be associated to the base file. */
25085 mac_ptr = section->buffer + offset;
25086 mac_end = section->buffer + section->size;
25088 mac_ptr = dwarf_parse_macro_header (opcode_definitions, abfd, mac_ptr,
25089 &offset_size, section_is_gnu);
25090 if (mac_ptr == NULL)
25092 /* We already issued a complaint. */
25098 /* Do we at least have room for a macinfo type byte? */
25099 if (mac_ptr >= mac_end)
25101 /* Complaint is printed during the second pass as GDB will probably
25102 stop the first pass earlier upon finding
25103 DW_MACINFO_start_file. */
25107 macinfo_type = (enum dwarf_macro_record_type) read_1_byte (abfd, mac_ptr);
25110 /* Note that we rely on the fact that the corresponding GNU and
25111 DWARF constants are the same. */
25113 DIAGNOSTIC_IGNORE_SWITCH_DIFFERENT_ENUM_TYPES
25114 switch (macinfo_type)
25116 /* A zero macinfo type indicates the end of the macro
25121 case DW_MACRO_define:
25122 case DW_MACRO_undef:
25123 /* Only skip the data by MAC_PTR. */
25125 unsigned int bytes_read;
25127 read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
25128 mac_ptr += bytes_read;
25129 read_direct_string (abfd, mac_ptr, &bytes_read);
25130 mac_ptr += bytes_read;
25134 case DW_MACRO_start_file:
25136 unsigned int bytes_read;
25139 line = read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
25140 mac_ptr += bytes_read;
25141 file = read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
25142 mac_ptr += bytes_read;
25144 current_file = macro_start_file (file, line, current_file, lh);
25148 case DW_MACRO_end_file:
25149 /* No data to skip by MAC_PTR. */
25152 case DW_MACRO_define_strp:
25153 case DW_MACRO_undef_strp:
25154 case DW_MACRO_define_sup:
25155 case DW_MACRO_undef_sup:
25157 unsigned int bytes_read;
25159 read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
25160 mac_ptr += bytes_read;
25161 mac_ptr += offset_size;
25165 case DW_MACRO_import:
25166 case DW_MACRO_import_sup:
25167 /* Note that, according to the spec, a transparent include
25168 chain cannot call DW_MACRO_start_file. So, we can just
25169 skip this opcode. */
25170 mac_ptr += offset_size;
25173 case DW_MACINFO_vendor_ext:
25174 /* Only skip the data by MAC_PTR. */
25175 if (!section_is_gnu)
25177 unsigned int bytes_read;
25179 read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
25180 mac_ptr += bytes_read;
25181 read_direct_string (abfd, mac_ptr, &bytes_read);
25182 mac_ptr += bytes_read;
25187 mac_ptr = skip_unknown_opcode (macinfo_type, opcode_definitions,
25188 mac_ptr, mac_end, abfd, offset_size,
25190 if (mac_ptr == NULL)
25195 } while (macinfo_type != 0 && current_file == NULL);
25197 /* Second pass: Process all entries.
25199 Use the AT_COMMAND_LINE flag to determine whether we are still processing
25200 command-line macro definitions/undefinitions. This flag is unset when we
25201 reach the first DW_MACINFO_start_file entry. */
25203 htab_up include_hash (htab_create_alloc (1, htab_hash_pointer,
25205 NULL, xcalloc, xfree));
25206 mac_ptr = section->buffer + offset;
25207 slot = htab_find_slot (include_hash.get (), mac_ptr, INSERT);
25208 *slot = (void *) mac_ptr;
25209 dwarf_decode_macro_bytes (dwarf2_per_objfile,
25210 abfd, mac_ptr, mac_end,
25211 current_file, lh, section,
25212 section_is_gnu, 0, offset_size,
25213 include_hash.get ());
25216 /* Check if the attribute's form is a DW_FORM_block*
25217 if so return true else false. */
25220 attr_form_is_block (const struct attribute *attr)
25222 return (attr == NULL ? 0 :
25223 attr->form == DW_FORM_block1
25224 || attr->form == DW_FORM_block2
25225 || attr->form == DW_FORM_block4
25226 || attr->form == DW_FORM_block
25227 || attr->form == DW_FORM_exprloc);
25230 /* Return non-zero if ATTR's value is a section offset --- classes
25231 lineptr, loclistptr, macptr or rangelistptr --- or zero, otherwise.
25232 You may use DW_UNSND (attr) to retrieve such offsets.
25234 Section 7.5.4, "Attribute Encodings", explains that no attribute
25235 may have a value that belongs to more than one of these classes; it
25236 would be ambiguous if we did, because we use the same forms for all
25240 attr_form_is_section_offset (const struct attribute *attr)
25242 return (attr->form == DW_FORM_data4
25243 || attr->form == DW_FORM_data8
25244 || attr->form == DW_FORM_sec_offset);
25247 /* Return non-zero if ATTR's value falls in the 'constant' class, or
25248 zero otherwise. When this function returns true, you can apply
25249 dwarf2_get_attr_constant_value to it.
25251 However, note that for some attributes you must check
25252 attr_form_is_section_offset before using this test. DW_FORM_data4
25253 and DW_FORM_data8 are members of both the constant class, and of
25254 the classes that contain offsets into other debug sections
25255 (lineptr, loclistptr, macptr or rangelistptr). The DWARF spec says
25256 that, if an attribute's can be either a constant or one of the
25257 section offset classes, DW_FORM_data4 and DW_FORM_data8 should be
25258 taken as section offsets, not constants.
25260 DW_FORM_data16 is not considered as dwarf2_get_attr_constant_value
25261 cannot handle that. */
25264 attr_form_is_constant (const struct attribute *attr)
25266 switch (attr->form)
25268 case DW_FORM_sdata:
25269 case DW_FORM_udata:
25270 case DW_FORM_data1:
25271 case DW_FORM_data2:
25272 case DW_FORM_data4:
25273 case DW_FORM_data8:
25274 case DW_FORM_implicit_const:
25282 /* DW_ADDR is always stored already as sect_offset; despite for the forms
25283 besides DW_FORM_ref_addr it is stored as cu_offset in the DWARF file. */
25286 attr_form_is_ref (const struct attribute *attr)
25288 switch (attr->form)
25290 case DW_FORM_ref_addr:
25295 case DW_FORM_ref_udata:
25296 case DW_FORM_GNU_ref_alt:
25303 /* Return the .debug_loc section to use for CU.
25304 For DWO files use .debug_loc.dwo. */
25306 static struct dwarf2_section_info *
25307 cu_debug_loc_section (struct dwarf2_cu *cu)
25309 struct dwarf2_per_objfile *dwarf2_per_objfile
25310 = cu->per_cu->dwarf2_per_objfile;
25314 struct dwo_sections *sections = &cu->dwo_unit->dwo_file->sections;
25316 return cu->header.version >= 5 ? §ions->loclists : §ions->loc;
25318 return (cu->header.version >= 5 ? &dwarf2_per_objfile->loclists
25319 : &dwarf2_per_objfile->loc);
25322 /* A helper function that fills in a dwarf2_loclist_baton. */
25325 fill_in_loclist_baton (struct dwarf2_cu *cu,
25326 struct dwarf2_loclist_baton *baton,
25327 const struct attribute *attr)
25329 struct dwarf2_per_objfile *dwarf2_per_objfile
25330 = cu->per_cu->dwarf2_per_objfile;
25331 struct dwarf2_section_info *section = cu_debug_loc_section (cu);
25333 dwarf2_read_section (dwarf2_per_objfile->objfile, section);
25335 baton->per_cu = cu->per_cu;
25336 gdb_assert (baton->per_cu);
25337 /* We don't know how long the location list is, but make sure we
25338 don't run off the edge of the section. */
25339 baton->size = section->size - DW_UNSND (attr);
25340 baton->data = section->buffer + DW_UNSND (attr);
25341 baton->base_address = cu->base_address;
25342 baton->from_dwo = cu->dwo_unit != NULL;
25346 dwarf2_symbol_mark_computed (const struct attribute *attr, struct symbol *sym,
25347 struct dwarf2_cu *cu, int is_block)
25349 struct dwarf2_per_objfile *dwarf2_per_objfile
25350 = cu->per_cu->dwarf2_per_objfile;
25351 struct objfile *objfile = dwarf2_per_objfile->objfile;
25352 struct dwarf2_section_info *section = cu_debug_loc_section (cu);
25354 if (attr_form_is_section_offset (attr)
25355 /* .debug_loc{,.dwo} may not exist at all, or the offset may be outside
25356 the section. If so, fall through to the complaint in the
25358 && DW_UNSND (attr) < dwarf2_section_size (objfile, section))
25360 struct dwarf2_loclist_baton *baton;
25362 baton = XOBNEW (&objfile->objfile_obstack, struct dwarf2_loclist_baton);
25364 fill_in_loclist_baton (cu, baton, attr);
25366 if (cu->base_known == 0)
25367 complaint (&symfile_complaints,
25368 _("Location list used without "
25369 "specifying the CU base address."));
25371 SYMBOL_ACLASS_INDEX (sym) = (is_block
25372 ? dwarf2_loclist_block_index
25373 : dwarf2_loclist_index);
25374 SYMBOL_LOCATION_BATON (sym) = baton;
25378 struct dwarf2_locexpr_baton *baton;
25380 baton = XOBNEW (&objfile->objfile_obstack, struct dwarf2_locexpr_baton);
25381 baton->per_cu = cu->per_cu;
25382 gdb_assert (baton->per_cu);
25384 if (attr_form_is_block (attr))
25386 /* Note that we're just copying the block's data pointer
25387 here, not the actual data. We're still pointing into the
25388 info_buffer for SYM's objfile; right now we never release
25389 that buffer, but when we do clean up properly this may
25391 baton->size = DW_BLOCK (attr)->size;
25392 baton->data = DW_BLOCK (attr)->data;
25396 dwarf2_invalid_attrib_class_complaint ("location description",
25397 SYMBOL_NATURAL_NAME (sym));
25401 SYMBOL_ACLASS_INDEX (sym) = (is_block
25402 ? dwarf2_locexpr_block_index
25403 : dwarf2_locexpr_index);
25404 SYMBOL_LOCATION_BATON (sym) = baton;
25408 /* Return the OBJFILE associated with the compilation unit CU. If CU
25409 came from a separate debuginfo file, then the master objfile is
25413 dwarf2_per_cu_objfile (struct dwarf2_per_cu_data *per_cu)
25415 struct objfile *objfile = per_cu->dwarf2_per_objfile->objfile;
25417 /* Return the master objfile, so that we can report and look up the
25418 correct file containing this variable. */
25419 if (objfile->separate_debug_objfile_backlink)
25420 objfile = objfile->separate_debug_objfile_backlink;
25425 /* Return comp_unit_head for PER_CU, either already available in PER_CU->CU
25426 (CU_HEADERP is unused in such case) or prepare a temporary copy at
25427 CU_HEADERP first. */
25429 static const struct comp_unit_head *
25430 per_cu_header_read_in (struct comp_unit_head *cu_headerp,
25431 struct dwarf2_per_cu_data *per_cu)
25433 const gdb_byte *info_ptr;
25436 return &per_cu->cu->header;
25438 info_ptr = per_cu->section->buffer + to_underlying (per_cu->sect_off);
25440 memset (cu_headerp, 0, sizeof (*cu_headerp));
25441 read_comp_unit_head (cu_headerp, info_ptr, per_cu->section,
25442 rcuh_kind::COMPILE);
25447 /* Return the address size given in the compilation unit header for CU. */
25450 dwarf2_per_cu_addr_size (struct dwarf2_per_cu_data *per_cu)
25452 struct comp_unit_head cu_header_local;
25453 const struct comp_unit_head *cu_headerp;
25455 cu_headerp = per_cu_header_read_in (&cu_header_local, per_cu);
25457 return cu_headerp->addr_size;
25460 /* Return the offset size given in the compilation unit header for CU. */
25463 dwarf2_per_cu_offset_size (struct dwarf2_per_cu_data *per_cu)
25465 struct comp_unit_head cu_header_local;
25466 const struct comp_unit_head *cu_headerp;
25468 cu_headerp = per_cu_header_read_in (&cu_header_local, per_cu);
25470 return cu_headerp->offset_size;
25473 /* See its dwarf2loc.h declaration. */
25476 dwarf2_per_cu_ref_addr_size (struct dwarf2_per_cu_data *per_cu)
25478 struct comp_unit_head cu_header_local;
25479 const struct comp_unit_head *cu_headerp;
25481 cu_headerp = per_cu_header_read_in (&cu_header_local, per_cu);
25483 if (cu_headerp->version == 2)
25484 return cu_headerp->addr_size;
25486 return cu_headerp->offset_size;
25489 /* Return the text offset of the CU. The returned offset comes from
25490 this CU's objfile. If this objfile came from a separate debuginfo
25491 file, then the offset may be different from the corresponding
25492 offset in the parent objfile. */
25495 dwarf2_per_cu_text_offset (struct dwarf2_per_cu_data *per_cu)
25497 struct objfile *objfile = per_cu->dwarf2_per_objfile->objfile;
25499 return ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
25502 /* Return DWARF version number of PER_CU. */
25505 dwarf2_version (struct dwarf2_per_cu_data *per_cu)
25507 return per_cu->dwarf_version;
25510 /* Locate the .debug_info compilation unit from CU's objfile which contains
25511 the DIE at OFFSET. Raises an error on failure. */
25513 static struct dwarf2_per_cu_data *
25514 dwarf2_find_containing_comp_unit (sect_offset sect_off,
25515 unsigned int offset_in_dwz,
25516 struct dwarf2_per_objfile *dwarf2_per_objfile)
25518 struct dwarf2_per_cu_data *this_cu;
25520 const sect_offset *cu_off;
25523 high = dwarf2_per_objfile->n_comp_units - 1;
25526 struct dwarf2_per_cu_data *mid_cu;
25527 int mid = low + (high - low) / 2;
25529 mid_cu = dwarf2_per_objfile->all_comp_units[mid];
25530 cu_off = &mid_cu->sect_off;
25531 if (mid_cu->is_dwz > offset_in_dwz
25532 || (mid_cu->is_dwz == offset_in_dwz && *cu_off >= sect_off))
25537 gdb_assert (low == high);
25538 this_cu = dwarf2_per_objfile->all_comp_units[low];
25539 cu_off = &this_cu->sect_off;
25540 if (this_cu->is_dwz != offset_in_dwz || *cu_off > sect_off)
25542 if (low == 0 || this_cu->is_dwz != offset_in_dwz)
25543 error (_("Dwarf Error: could not find partial DIE containing "
25544 "offset %s [in module %s]"),
25545 sect_offset_str (sect_off),
25546 bfd_get_filename (dwarf2_per_objfile->objfile->obfd));
25548 gdb_assert (dwarf2_per_objfile->all_comp_units[low-1]->sect_off
25550 return dwarf2_per_objfile->all_comp_units[low-1];
25554 this_cu = dwarf2_per_objfile->all_comp_units[low];
25555 if (low == dwarf2_per_objfile->n_comp_units - 1
25556 && sect_off >= this_cu->sect_off + this_cu->length)
25557 error (_("invalid dwarf2 offset %s"), sect_offset_str (sect_off));
25558 gdb_assert (sect_off < this_cu->sect_off + this_cu->length);
25563 /* Initialize dwarf2_cu CU, owned by PER_CU. */
25565 dwarf2_cu::dwarf2_cu (struct dwarf2_per_cu_data *per_cu_)
25566 : per_cu (per_cu_),
25569 checked_producer (0),
25570 producer_is_gxx_lt_4_6 (0),
25571 producer_is_gcc_lt_4_3 (0),
25572 producer_is_icc_lt_14 (0),
25573 processing_has_namespace_info (0)
25578 /* Destroy a dwarf2_cu. */
25580 dwarf2_cu::~dwarf2_cu ()
25585 /* Initialize basic fields of dwarf_cu CU according to DIE COMP_UNIT_DIE. */
25588 prepare_one_comp_unit (struct dwarf2_cu *cu, struct die_info *comp_unit_die,
25589 enum language pretend_language)
25591 struct attribute *attr;
25593 /* Set the language we're debugging. */
25594 attr = dwarf2_attr (comp_unit_die, DW_AT_language, cu);
25596 set_cu_language (DW_UNSND (attr), cu);
25599 cu->language = pretend_language;
25600 cu->language_defn = language_def (cu->language);
25603 cu->producer = dwarf2_string_attr (comp_unit_die, DW_AT_producer, cu);
25606 /* Free all cached compilation units. */
25609 free_cached_comp_units (void *data)
25611 struct dwarf2_per_objfile *dwarf2_per_objfile
25612 = (struct dwarf2_per_objfile *) data;
25614 dwarf2_per_objfile->free_cached_comp_units ();
25617 /* Increase the age counter on each cached compilation unit, and free
25618 any that are too old. */
25621 age_cached_comp_units (struct dwarf2_per_objfile *dwarf2_per_objfile)
25623 struct dwarf2_per_cu_data *per_cu, **last_chain;
25625 dwarf2_clear_marks (dwarf2_per_objfile->read_in_chain);
25626 per_cu = dwarf2_per_objfile->read_in_chain;
25627 while (per_cu != NULL)
25629 per_cu->cu->last_used ++;
25630 if (per_cu->cu->last_used <= dwarf_max_cache_age)
25631 dwarf2_mark (per_cu->cu);
25632 per_cu = per_cu->cu->read_in_chain;
25635 per_cu = dwarf2_per_objfile->read_in_chain;
25636 last_chain = &dwarf2_per_objfile->read_in_chain;
25637 while (per_cu != NULL)
25639 struct dwarf2_per_cu_data *next_cu;
25641 next_cu = per_cu->cu->read_in_chain;
25643 if (!per_cu->cu->mark)
25646 *last_chain = next_cu;
25649 last_chain = &per_cu->cu->read_in_chain;
25655 /* Remove a single compilation unit from the cache. */
25658 free_one_cached_comp_unit (struct dwarf2_per_cu_data *target_per_cu)
25660 struct dwarf2_per_cu_data *per_cu, **last_chain;
25661 struct dwarf2_per_objfile *dwarf2_per_objfile
25662 = target_per_cu->dwarf2_per_objfile;
25664 per_cu = dwarf2_per_objfile->read_in_chain;
25665 last_chain = &dwarf2_per_objfile->read_in_chain;
25666 while (per_cu != NULL)
25668 struct dwarf2_per_cu_data *next_cu;
25670 next_cu = per_cu->cu->read_in_chain;
25672 if (per_cu == target_per_cu)
25676 *last_chain = next_cu;
25680 last_chain = &per_cu->cu->read_in_chain;
25686 /* Release all extra memory associated with OBJFILE. */
25689 dwarf2_free_objfile (struct objfile *objfile)
25691 struct dwarf2_per_objfile *dwarf2_per_objfile
25692 = get_dwarf2_per_objfile (objfile);
25694 delete dwarf2_per_objfile;
25697 /* A set of CU "per_cu" pointer, DIE offset, and GDB type pointer.
25698 We store these in a hash table separate from the DIEs, and preserve them
25699 when the DIEs are flushed out of cache.
25701 The CU "per_cu" pointer is needed because offset alone is not enough to
25702 uniquely identify the type. A file may have multiple .debug_types sections,
25703 or the type may come from a DWO file. Furthermore, while it's more logical
25704 to use per_cu->section+offset, with Fission the section with the data is in
25705 the DWO file but we don't know that section at the point we need it.
25706 We have to use something in dwarf2_per_cu_data (or the pointer to it)
25707 because we can enter the lookup routine, get_die_type_at_offset, from
25708 outside this file, and thus won't necessarily have PER_CU->cu.
25709 Fortunately, PER_CU is stable for the life of the objfile. */
25711 struct dwarf2_per_cu_offset_and_type
25713 const struct dwarf2_per_cu_data *per_cu;
25714 sect_offset sect_off;
25718 /* Hash function for a dwarf2_per_cu_offset_and_type. */
25721 per_cu_offset_and_type_hash (const void *item)
25723 const struct dwarf2_per_cu_offset_and_type *ofs
25724 = (const struct dwarf2_per_cu_offset_and_type *) item;
25726 return (uintptr_t) ofs->per_cu + to_underlying (ofs->sect_off);
25729 /* Equality function for a dwarf2_per_cu_offset_and_type. */
25732 per_cu_offset_and_type_eq (const void *item_lhs, const void *item_rhs)
25734 const struct dwarf2_per_cu_offset_and_type *ofs_lhs
25735 = (const struct dwarf2_per_cu_offset_and_type *) item_lhs;
25736 const struct dwarf2_per_cu_offset_and_type *ofs_rhs
25737 = (const struct dwarf2_per_cu_offset_and_type *) item_rhs;
25739 return (ofs_lhs->per_cu == ofs_rhs->per_cu
25740 && ofs_lhs->sect_off == ofs_rhs->sect_off);
25743 /* Set the type associated with DIE to TYPE. Save it in CU's hash
25744 table if necessary. For convenience, return TYPE.
25746 The DIEs reading must have careful ordering to:
25747 * Not cause infite loops trying to read in DIEs as a prerequisite for
25748 reading current DIE.
25749 * Not trying to dereference contents of still incompletely read in types
25750 while reading in other DIEs.
25751 * Enable referencing still incompletely read in types just by a pointer to
25752 the type without accessing its fields.
25754 Therefore caller should follow these rules:
25755 * Try to fetch any prerequisite types we may need to build this DIE type
25756 before building the type and calling set_die_type.
25757 * After building type call set_die_type for current DIE as soon as
25758 possible before fetching more types to complete the current type.
25759 * Make the type as complete as possible before fetching more types. */
25761 static struct type *
25762 set_die_type (struct die_info *die, struct type *type, struct dwarf2_cu *cu)
25764 struct dwarf2_per_objfile *dwarf2_per_objfile
25765 = cu->per_cu->dwarf2_per_objfile;
25766 struct dwarf2_per_cu_offset_and_type **slot, ofs;
25767 struct objfile *objfile = dwarf2_per_objfile->objfile;
25768 struct attribute *attr;
25769 struct dynamic_prop prop;
25771 /* For Ada types, make sure that the gnat-specific data is always
25772 initialized (if not already set). There are a few types where
25773 we should not be doing so, because the type-specific area is
25774 already used to hold some other piece of info (eg: TYPE_CODE_FLT
25775 where the type-specific area is used to store the floatformat).
25776 But this is not a problem, because the gnat-specific information
25777 is actually not needed for these types. */
25778 if (need_gnat_info (cu)
25779 && TYPE_CODE (type) != TYPE_CODE_FUNC
25780 && TYPE_CODE (type) != TYPE_CODE_FLT
25781 && TYPE_CODE (type) != TYPE_CODE_METHODPTR
25782 && TYPE_CODE (type) != TYPE_CODE_MEMBERPTR
25783 && TYPE_CODE (type) != TYPE_CODE_METHOD
25784 && !HAVE_GNAT_AUX_INFO (type))
25785 INIT_GNAT_SPECIFIC (type);
25787 /* Read DW_AT_allocated and set in type. */
25788 attr = dwarf2_attr (die, DW_AT_allocated, cu);
25789 if (attr_form_is_block (attr))
25791 if (attr_to_dynamic_prop (attr, die, cu, &prop))
25792 add_dyn_prop (DYN_PROP_ALLOCATED, prop, type);
25794 else if (attr != NULL)
25796 complaint (&symfile_complaints,
25797 _("DW_AT_allocated has the wrong form (%s) at DIE %s"),
25798 (attr != NULL ? dwarf_form_name (attr->form) : "n/a"),
25799 sect_offset_str (die->sect_off));
25802 /* Read DW_AT_associated and set in type. */
25803 attr = dwarf2_attr (die, DW_AT_associated, cu);
25804 if (attr_form_is_block (attr))
25806 if (attr_to_dynamic_prop (attr, die, cu, &prop))
25807 add_dyn_prop (DYN_PROP_ASSOCIATED, prop, type);
25809 else if (attr != NULL)
25811 complaint (&symfile_complaints,
25812 _("DW_AT_associated has the wrong form (%s) at DIE %s"),
25813 (attr != NULL ? dwarf_form_name (attr->form) : "n/a"),
25814 sect_offset_str (die->sect_off));
25817 /* Read DW_AT_data_location and set in type. */
25818 attr = dwarf2_attr (die, DW_AT_data_location, cu);
25819 if (attr_to_dynamic_prop (attr, die, cu, &prop))
25820 add_dyn_prop (DYN_PROP_DATA_LOCATION, prop, type);
25822 if (dwarf2_per_objfile->die_type_hash == NULL)
25824 dwarf2_per_objfile->die_type_hash =
25825 htab_create_alloc_ex (127,
25826 per_cu_offset_and_type_hash,
25827 per_cu_offset_and_type_eq,
25829 &objfile->objfile_obstack,
25830 hashtab_obstack_allocate,
25831 dummy_obstack_deallocate);
25834 ofs.per_cu = cu->per_cu;
25835 ofs.sect_off = die->sect_off;
25837 slot = (struct dwarf2_per_cu_offset_and_type **)
25838 htab_find_slot (dwarf2_per_objfile->die_type_hash, &ofs, INSERT);
25840 complaint (&symfile_complaints,
25841 _("A problem internal to GDB: DIE %s has type already set"),
25842 sect_offset_str (die->sect_off));
25843 *slot = XOBNEW (&objfile->objfile_obstack,
25844 struct dwarf2_per_cu_offset_and_type);
25849 /* Look up the type for the die at SECT_OFF in PER_CU in die_type_hash,
25850 or return NULL if the die does not have a saved type. */
25852 static struct type *
25853 get_die_type_at_offset (sect_offset sect_off,
25854 struct dwarf2_per_cu_data *per_cu)
25856 struct dwarf2_per_cu_offset_and_type *slot, ofs;
25857 struct dwarf2_per_objfile *dwarf2_per_objfile = per_cu->dwarf2_per_objfile;
25859 if (dwarf2_per_objfile->die_type_hash == NULL)
25862 ofs.per_cu = per_cu;
25863 ofs.sect_off = sect_off;
25864 slot = ((struct dwarf2_per_cu_offset_and_type *)
25865 htab_find (dwarf2_per_objfile->die_type_hash, &ofs));
25872 /* Look up the type for DIE in CU in die_type_hash,
25873 or return NULL if DIE does not have a saved type. */
25875 static struct type *
25876 get_die_type (struct die_info *die, struct dwarf2_cu *cu)
25878 return get_die_type_at_offset (die->sect_off, cu->per_cu);
25881 /* Add a dependence relationship from CU to REF_PER_CU. */
25884 dwarf2_add_dependence (struct dwarf2_cu *cu,
25885 struct dwarf2_per_cu_data *ref_per_cu)
25889 if (cu->dependencies == NULL)
25891 = htab_create_alloc_ex (5, htab_hash_pointer, htab_eq_pointer,
25892 NULL, &cu->comp_unit_obstack,
25893 hashtab_obstack_allocate,
25894 dummy_obstack_deallocate);
25896 slot = htab_find_slot (cu->dependencies, ref_per_cu, INSERT);
25898 *slot = ref_per_cu;
25901 /* Subroutine of dwarf2_mark to pass to htab_traverse.
25902 Set the mark field in every compilation unit in the
25903 cache that we must keep because we are keeping CU. */
25906 dwarf2_mark_helper (void **slot, void *data)
25908 struct dwarf2_per_cu_data *per_cu;
25910 per_cu = (struct dwarf2_per_cu_data *) *slot;
25912 /* cu->dependencies references may not yet have been ever read if QUIT aborts
25913 reading of the chain. As such dependencies remain valid it is not much
25914 useful to track and undo them during QUIT cleanups. */
25915 if (per_cu->cu == NULL)
25918 if (per_cu->cu->mark)
25920 per_cu->cu->mark = 1;
25922 if (per_cu->cu->dependencies != NULL)
25923 htab_traverse (per_cu->cu->dependencies, dwarf2_mark_helper, NULL);
25928 /* Set the mark field in CU and in every other compilation unit in the
25929 cache that we must keep because we are keeping CU. */
25932 dwarf2_mark (struct dwarf2_cu *cu)
25937 if (cu->dependencies != NULL)
25938 htab_traverse (cu->dependencies, dwarf2_mark_helper, NULL);
25942 dwarf2_clear_marks (struct dwarf2_per_cu_data *per_cu)
25946 per_cu->cu->mark = 0;
25947 per_cu = per_cu->cu->read_in_chain;
25951 /* Trivial hash function for partial_die_info: the hash value of a DIE
25952 is its offset in .debug_info for this objfile. */
25955 partial_die_hash (const void *item)
25957 const struct partial_die_info *part_die
25958 = (const struct partial_die_info *) item;
25960 return to_underlying (part_die->sect_off);
25963 /* Trivial comparison function for partial_die_info structures: two DIEs
25964 are equal if they have the same offset. */
25967 partial_die_eq (const void *item_lhs, const void *item_rhs)
25969 const struct partial_die_info *part_die_lhs
25970 = (const struct partial_die_info *) item_lhs;
25971 const struct partial_die_info *part_die_rhs
25972 = (const struct partial_die_info *) item_rhs;
25974 return part_die_lhs->sect_off == part_die_rhs->sect_off;
25977 static struct cmd_list_element *set_dwarf_cmdlist;
25978 static struct cmd_list_element *show_dwarf_cmdlist;
25981 set_dwarf_cmd (const char *args, int from_tty)
25983 help_list (set_dwarf_cmdlist, "maintenance set dwarf ", all_commands,
25988 show_dwarf_cmd (const char *args, int from_tty)
25990 cmd_show_list (show_dwarf_cmdlist, from_tty, "");
25993 /* The "save gdb-index" command. */
25995 /* Write SIZE bytes from the buffer pointed to by DATA to FILE, with
25999 file_write (FILE *file, const void *data, size_t size)
26001 if (fwrite (data, 1, size, file) != size)
26002 error (_("couldn't data write to file"));
26005 /* Write the contents of VEC to FILE, with error checking. */
26007 template<typename Elem, typename Alloc>
26009 file_write (FILE *file, const std::vector<Elem, Alloc> &vec)
26011 file_write (file, vec.data (), vec.size () * sizeof (vec[0]));
26014 /* In-memory buffer to prepare data to be written later to a file. */
26018 /* Copy DATA to the end of the buffer. */
26019 template<typename T>
26020 void append_data (const T &data)
26022 std::copy (reinterpret_cast<const gdb_byte *> (&data),
26023 reinterpret_cast<const gdb_byte *> (&data + 1),
26024 grow (sizeof (data)));
26027 /* Copy CSTR (a zero-terminated string) to the end of buffer. The
26028 terminating zero is appended too. */
26029 void append_cstr0 (const char *cstr)
26031 const size_t size = strlen (cstr) + 1;
26032 std::copy (cstr, cstr + size, grow (size));
26035 /* Store INPUT as ULEB128 to the end of buffer. */
26036 void append_unsigned_leb128 (ULONGEST input)
26040 gdb_byte output = input & 0x7f;
26044 append_data (output);
26050 /* Accept a host-format integer in VAL and append it to the buffer
26051 as a target-format integer which is LEN bytes long. */
26052 void append_uint (size_t len, bfd_endian byte_order, ULONGEST val)
26054 ::store_unsigned_integer (grow (len), len, byte_order, val);
26057 /* Return the size of the buffer. */
26058 size_t size () const
26060 return m_vec.size ();
26063 /* Return true iff the buffer is empty. */
26064 bool empty () const
26066 return m_vec.empty ();
26069 /* Write the buffer to FILE. */
26070 void file_write (FILE *file) const
26072 ::file_write (file, m_vec);
26076 /* Grow SIZE bytes at the end of the buffer. Returns a pointer to
26077 the start of the new block. */
26078 gdb_byte *grow (size_t size)
26080 m_vec.resize (m_vec.size () + size);
26081 return &*m_vec.end () - size;
26084 gdb::byte_vector m_vec;
26087 /* An entry in the symbol table. */
26088 struct symtab_index_entry
26090 /* The name of the symbol. */
26092 /* The offset of the name in the constant pool. */
26093 offset_type index_offset;
26094 /* A sorted vector of the indices of all the CUs that hold an object
26096 std::vector<offset_type> cu_indices;
26099 /* The symbol table. This is a power-of-2-sized hash table. */
26100 struct mapped_symtab
26104 data.resize (1024);
26107 offset_type n_elements = 0;
26108 std::vector<symtab_index_entry> data;
26111 /* Find a slot in SYMTAB for the symbol NAME. Returns a reference to
26114 Function is used only during write_hash_table so no index format backward
26115 compatibility is needed. */
26117 static symtab_index_entry &
26118 find_slot (struct mapped_symtab *symtab, const char *name)
26120 offset_type index, step, hash = mapped_index_string_hash (INT_MAX, name);
26122 index = hash & (symtab->data.size () - 1);
26123 step = ((hash * 17) & (symtab->data.size () - 1)) | 1;
26127 if (symtab->data[index].name == NULL
26128 || strcmp (name, symtab->data[index].name) == 0)
26129 return symtab->data[index];
26130 index = (index + step) & (symtab->data.size () - 1);
26134 /* Expand SYMTAB's hash table. */
26137 hash_expand (struct mapped_symtab *symtab)
26139 auto old_entries = std::move (symtab->data);
26141 symtab->data.clear ();
26142 symtab->data.resize (old_entries.size () * 2);
26144 for (auto &it : old_entries)
26145 if (it.name != NULL)
26147 auto &ref = find_slot (symtab, it.name);
26148 ref = std::move (it);
26152 /* Add an entry to SYMTAB. NAME is the name of the symbol.
26153 CU_INDEX is the index of the CU in which the symbol appears.
26154 IS_STATIC is one if the symbol is static, otherwise zero (global). */
26157 add_index_entry (struct mapped_symtab *symtab, const char *name,
26158 int is_static, gdb_index_symbol_kind kind,
26159 offset_type cu_index)
26161 offset_type cu_index_and_attrs;
26163 ++symtab->n_elements;
26164 if (4 * symtab->n_elements / 3 >= symtab->data.size ())
26165 hash_expand (symtab);
26167 symtab_index_entry &slot = find_slot (symtab, name);
26168 if (slot.name == NULL)
26171 /* index_offset is set later. */
26174 cu_index_and_attrs = 0;
26175 DW2_GDB_INDEX_CU_SET_VALUE (cu_index_and_attrs, cu_index);
26176 DW2_GDB_INDEX_SYMBOL_STATIC_SET_VALUE (cu_index_and_attrs, is_static);
26177 DW2_GDB_INDEX_SYMBOL_KIND_SET_VALUE (cu_index_and_attrs, kind);
26179 /* We don't want to record an index value twice as we want to avoid the
26181 We process all global symbols and then all static symbols
26182 (which would allow us to avoid the duplication by only having to check
26183 the last entry pushed), but a symbol could have multiple kinds in one CU.
26184 To keep things simple we don't worry about the duplication here and
26185 sort and uniqufy the list after we've processed all symbols. */
26186 slot.cu_indices.push_back (cu_index_and_attrs);
26189 /* Sort and remove duplicates of all symbols' cu_indices lists. */
26192 uniquify_cu_indices (struct mapped_symtab *symtab)
26194 for (auto &entry : symtab->data)
26196 if (entry.name != NULL && !entry.cu_indices.empty ())
26198 auto &cu_indices = entry.cu_indices;
26199 std::sort (cu_indices.begin (), cu_indices.end ());
26200 auto from = std::unique (cu_indices.begin (), cu_indices.end ());
26201 cu_indices.erase (from, cu_indices.end ());
26206 /* A form of 'const char *' suitable for container keys. Only the
26207 pointer is stored. The strings themselves are compared, not the
26212 c_str_view (const char *cstr)
26216 bool operator== (const c_str_view &other) const
26218 return strcmp (m_cstr, other.m_cstr) == 0;
26221 /* Return the underlying C string. Note, the returned string is
26222 only a reference with lifetime of this object. */
26223 const char *c_str () const
26229 friend class c_str_view_hasher;
26230 const char *const m_cstr;
26233 /* A std::unordered_map::hasher for c_str_view that uses the right
26234 hash function for strings in a mapped index. */
26235 class c_str_view_hasher
26238 size_t operator () (const c_str_view &x) const
26240 return mapped_index_string_hash (INT_MAX, x.m_cstr);
26244 /* A std::unordered_map::hasher for std::vector<>. */
26245 template<typename T>
26246 class vector_hasher
26249 size_t operator () (const std::vector<T> &key) const
26251 return iterative_hash (key.data (),
26252 sizeof (key.front ()) * key.size (), 0);
26256 /* Write the mapped hash table SYMTAB to the data buffer OUTPUT, with
26257 constant pool entries going into the data buffer CPOOL. */
26260 write_hash_table (mapped_symtab *symtab, data_buf &output, data_buf &cpool)
26263 /* Elements are sorted vectors of the indices of all the CUs that
26264 hold an object of this name. */
26265 std::unordered_map<std::vector<offset_type>, offset_type,
26266 vector_hasher<offset_type>>
26269 /* We add all the index vectors to the constant pool first, to
26270 ensure alignment is ok. */
26271 for (symtab_index_entry &entry : symtab->data)
26273 if (entry.name == NULL)
26275 gdb_assert (entry.index_offset == 0);
26277 /* Finding before inserting is faster than always trying to
26278 insert, because inserting always allocates a node, does the
26279 lookup, and then destroys the new node if another node
26280 already had the same key. C++17 try_emplace will avoid
26283 = symbol_hash_table.find (entry.cu_indices);
26284 if (found != symbol_hash_table.end ())
26286 entry.index_offset = found->second;
26290 symbol_hash_table.emplace (entry.cu_indices, cpool.size ());
26291 entry.index_offset = cpool.size ();
26292 cpool.append_data (MAYBE_SWAP (entry.cu_indices.size ()));
26293 for (const auto index : entry.cu_indices)
26294 cpool.append_data (MAYBE_SWAP (index));
26298 /* Now write out the hash table. */
26299 std::unordered_map<c_str_view, offset_type, c_str_view_hasher> str_table;
26300 for (const auto &entry : symtab->data)
26302 offset_type str_off, vec_off;
26304 if (entry.name != NULL)
26306 const auto insertpair = str_table.emplace (entry.name, cpool.size ());
26307 if (insertpair.second)
26308 cpool.append_cstr0 (entry.name);
26309 str_off = insertpair.first->second;
26310 vec_off = entry.index_offset;
26314 /* While 0 is a valid constant pool index, it is not valid
26315 to have 0 for both offsets. */
26320 output.append_data (MAYBE_SWAP (str_off));
26321 output.append_data (MAYBE_SWAP (vec_off));
26325 typedef std::unordered_map<partial_symtab *, unsigned int> psym_index_map;
26327 /* Helper struct for building the address table. */
26328 struct addrmap_index_data
26330 addrmap_index_data (data_buf &addr_vec_, psym_index_map &cu_index_htab_)
26331 : addr_vec (addr_vec_), cu_index_htab (cu_index_htab_)
26334 struct objfile *objfile;
26335 data_buf &addr_vec;
26336 psym_index_map &cu_index_htab;
26338 /* Non-zero if the previous_* fields are valid.
26339 We can't write an entry until we see the next entry (since it is only then
26340 that we know the end of the entry). */
26341 int previous_valid;
26342 /* Index of the CU in the table of all CUs in the index file. */
26343 unsigned int previous_cu_index;
26344 /* Start address of the CU. */
26345 CORE_ADDR previous_cu_start;
26348 /* Write an address entry to ADDR_VEC. */
26351 add_address_entry (struct objfile *objfile, data_buf &addr_vec,
26352 CORE_ADDR start, CORE_ADDR end, unsigned int cu_index)
26354 CORE_ADDR baseaddr;
26356 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
26358 addr_vec.append_uint (8, BFD_ENDIAN_LITTLE, start - baseaddr);
26359 addr_vec.append_uint (8, BFD_ENDIAN_LITTLE, end - baseaddr);
26360 addr_vec.append_data (MAYBE_SWAP (cu_index));
26363 /* Worker function for traversing an addrmap to build the address table. */
26366 add_address_entry_worker (void *datap, CORE_ADDR start_addr, void *obj)
26368 struct addrmap_index_data *data = (struct addrmap_index_data *) datap;
26369 struct partial_symtab *pst = (struct partial_symtab *) obj;
26371 if (data->previous_valid)
26372 add_address_entry (data->objfile, data->addr_vec,
26373 data->previous_cu_start, start_addr,
26374 data->previous_cu_index);
26376 data->previous_cu_start = start_addr;
26379 const auto it = data->cu_index_htab.find (pst);
26380 gdb_assert (it != data->cu_index_htab.cend ());
26381 data->previous_cu_index = it->second;
26382 data->previous_valid = 1;
26385 data->previous_valid = 0;
26390 /* Write OBJFILE's address map to ADDR_VEC.
26391 CU_INDEX_HTAB is used to map addrmap entries to their CU indices
26392 in the index file. */
26395 write_address_map (struct objfile *objfile, data_buf &addr_vec,
26396 psym_index_map &cu_index_htab)
26398 struct addrmap_index_data addrmap_index_data (addr_vec, cu_index_htab);
26400 /* When writing the address table, we have to cope with the fact that
26401 the addrmap iterator only provides the start of a region; we have to
26402 wait until the next invocation to get the start of the next region. */
26404 addrmap_index_data.objfile = objfile;
26405 addrmap_index_data.previous_valid = 0;
26407 addrmap_foreach (objfile->psymtabs_addrmap, add_address_entry_worker,
26408 &addrmap_index_data);
26410 /* It's highly unlikely the last entry (end address = 0xff...ff)
26411 is valid, but we should still handle it.
26412 The end address is recorded as the start of the next region, but that
26413 doesn't work here. To cope we pass 0xff...ff, this is a rare situation
26415 if (addrmap_index_data.previous_valid)
26416 add_address_entry (objfile, addr_vec,
26417 addrmap_index_data.previous_cu_start, (CORE_ADDR) -1,
26418 addrmap_index_data.previous_cu_index);
26421 /* Return the symbol kind of PSYM. */
26423 static gdb_index_symbol_kind
26424 symbol_kind (struct partial_symbol *psym)
26426 domain_enum domain = PSYMBOL_DOMAIN (psym);
26427 enum address_class aclass = PSYMBOL_CLASS (psym);
26435 return GDB_INDEX_SYMBOL_KIND_FUNCTION;
26437 return GDB_INDEX_SYMBOL_KIND_TYPE;
26439 case LOC_CONST_BYTES:
26440 case LOC_OPTIMIZED_OUT:
26442 return GDB_INDEX_SYMBOL_KIND_VARIABLE;
26444 /* Note: It's currently impossible to recognize psyms as enum values
26445 short of reading the type info. For now punt. */
26446 return GDB_INDEX_SYMBOL_KIND_VARIABLE;
26448 /* There are other LOC_FOO values that one might want to classify
26449 as variables, but dwarf2read.c doesn't currently use them. */
26450 return GDB_INDEX_SYMBOL_KIND_OTHER;
26452 case STRUCT_DOMAIN:
26453 return GDB_INDEX_SYMBOL_KIND_TYPE;
26455 return GDB_INDEX_SYMBOL_KIND_OTHER;
26459 /* Add a list of partial symbols to SYMTAB. */
26462 write_psymbols (struct mapped_symtab *symtab,
26463 std::unordered_set<partial_symbol *> &psyms_seen,
26464 struct partial_symbol **psymp,
26466 offset_type cu_index,
26469 for (; count-- > 0; ++psymp)
26471 struct partial_symbol *psym = *psymp;
26473 if (SYMBOL_LANGUAGE (psym) == language_ada)
26474 error (_("Ada is not currently supported by the index"));
26476 /* Only add a given psymbol once. */
26477 if (psyms_seen.insert (psym).second)
26479 gdb_index_symbol_kind kind = symbol_kind (psym);
26481 add_index_entry (symtab, SYMBOL_SEARCH_NAME (psym),
26482 is_static, kind, cu_index);
26487 /* A helper struct used when iterating over debug_types. */
26488 struct signatured_type_index_data
26490 signatured_type_index_data (data_buf &types_list_,
26491 std::unordered_set<partial_symbol *> &psyms_seen_)
26492 : types_list (types_list_), psyms_seen (psyms_seen_)
26495 struct objfile *objfile;
26496 struct mapped_symtab *symtab;
26497 data_buf &types_list;
26498 std::unordered_set<partial_symbol *> &psyms_seen;
26502 /* A helper function that writes a single signatured_type to an
26506 write_one_signatured_type (void **slot, void *d)
26508 struct signatured_type_index_data *info
26509 = (struct signatured_type_index_data *) d;
26510 struct signatured_type *entry = (struct signatured_type *) *slot;
26511 struct partial_symtab *psymtab = entry->per_cu.v.psymtab;
26513 write_psymbols (info->symtab,
26515 &info->objfile->global_psymbols[psymtab->globals_offset],
26516 psymtab->n_global_syms, info->cu_index,
26518 write_psymbols (info->symtab,
26520 &info->objfile->static_psymbols[psymtab->statics_offset],
26521 psymtab->n_static_syms, info->cu_index,
26524 info->types_list.append_uint (8, BFD_ENDIAN_LITTLE,
26525 to_underlying (entry->per_cu.sect_off));
26526 info->types_list.append_uint (8, BFD_ENDIAN_LITTLE,
26527 to_underlying (entry->type_offset_in_tu));
26528 info->types_list.append_uint (8, BFD_ENDIAN_LITTLE, entry->signature);
26535 /* Recurse into all "included" dependencies and count their symbols as
26536 if they appeared in this psymtab. */
26539 recursively_count_psymbols (struct partial_symtab *psymtab,
26540 size_t &psyms_seen)
26542 for (int i = 0; i < psymtab->number_of_dependencies; ++i)
26543 if (psymtab->dependencies[i]->user != NULL)
26544 recursively_count_psymbols (psymtab->dependencies[i],
26547 psyms_seen += psymtab->n_global_syms;
26548 psyms_seen += psymtab->n_static_syms;
26551 /* Recurse into all "included" dependencies and write their symbols as
26552 if they appeared in this psymtab. */
26555 recursively_write_psymbols (struct objfile *objfile,
26556 struct partial_symtab *psymtab,
26557 struct mapped_symtab *symtab,
26558 std::unordered_set<partial_symbol *> &psyms_seen,
26559 offset_type cu_index)
26563 for (i = 0; i < psymtab->number_of_dependencies; ++i)
26564 if (psymtab->dependencies[i]->user != NULL)
26565 recursively_write_psymbols (objfile, psymtab->dependencies[i],
26566 symtab, psyms_seen, cu_index);
26568 write_psymbols (symtab,
26570 &objfile->global_psymbols[psymtab->globals_offset],
26571 psymtab->n_global_syms, cu_index,
26573 write_psymbols (symtab,
26575 &objfile->static_psymbols[psymtab->statics_offset],
26576 psymtab->n_static_syms, cu_index,
26580 /* DWARF-5 .debug_names builder. */
26584 debug_names (struct dwarf2_per_objfile *dwarf2_per_objfile, bool is_dwarf64,
26585 bfd_endian dwarf5_byte_order)
26586 : m_dwarf5_byte_order (dwarf5_byte_order),
26587 m_dwarf32 (dwarf5_byte_order),
26588 m_dwarf64 (dwarf5_byte_order),
26589 m_dwarf (is_dwarf64
26590 ? static_cast<dwarf &> (m_dwarf64)
26591 : static_cast<dwarf &> (m_dwarf32)),
26592 m_name_table_string_offs (m_dwarf.name_table_string_offs),
26593 m_name_table_entry_offs (m_dwarf.name_table_entry_offs),
26594 m_debugstrlookup (dwarf2_per_objfile)
26597 int dwarf5_offset_size () const
26599 const bool dwarf5_is_dwarf64 = &m_dwarf == &m_dwarf64;
26600 return dwarf5_is_dwarf64 ? 8 : 4;
26603 /* Is this symbol from DW_TAG_compile_unit or DW_TAG_type_unit? */
26604 enum class unit_kind { cu, tu };
26606 /* Insert one symbol. */
26607 void insert (const partial_symbol *psym, int cu_index, bool is_static,
26610 const int dwarf_tag = psymbol_tag (psym);
26611 if (dwarf_tag == 0)
26613 const char *const name = SYMBOL_SEARCH_NAME (psym);
26614 const auto insertpair
26615 = m_name_to_value_set.emplace (c_str_view (name),
26616 std::set<symbol_value> ());
26617 std::set<symbol_value> &value_set = insertpair.first->second;
26618 value_set.emplace (symbol_value (dwarf_tag, cu_index, is_static, kind));
26621 /* Build all the tables. All symbols must be already inserted.
26622 This function does not call file_write, caller has to do it
26626 /* Verify the build method has not be called twice. */
26627 gdb_assert (m_abbrev_table.empty ());
26628 const size_t name_count = m_name_to_value_set.size ();
26629 m_bucket_table.resize
26630 (std::pow (2, std::ceil (std::log2 (name_count * 4 / 3))));
26631 m_hash_table.reserve (name_count);
26632 m_name_table_string_offs.reserve (name_count);
26633 m_name_table_entry_offs.reserve (name_count);
26635 /* Map each hash of symbol to its name and value. */
26636 struct hash_it_pair
26639 decltype (m_name_to_value_set)::const_iterator it;
26641 std::vector<std::forward_list<hash_it_pair>> bucket_hash;
26642 bucket_hash.resize (m_bucket_table.size ());
26643 for (decltype (m_name_to_value_set)::const_iterator it
26644 = m_name_to_value_set.cbegin ();
26645 it != m_name_to_value_set.cend ();
26648 const char *const name = it->first.c_str ();
26649 const uint32_t hash = dwarf5_djb_hash (name);
26650 hash_it_pair hashitpair;
26651 hashitpair.hash = hash;
26652 hashitpair.it = it;
26653 auto &slot = bucket_hash[hash % bucket_hash.size()];
26654 slot.push_front (std::move (hashitpair));
26656 for (size_t bucket_ix = 0; bucket_ix < bucket_hash.size (); ++bucket_ix)
26658 const std::forward_list<hash_it_pair> &hashitlist
26659 = bucket_hash[bucket_ix];
26660 if (hashitlist.empty ())
26662 uint32_t &bucket_slot = m_bucket_table[bucket_ix];
26663 /* The hashes array is indexed starting at 1. */
26664 store_unsigned_integer (reinterpret_cast<gdb_byte *> (&bucket_slot),
26665 sizeof (bucket_slot), m_dwarf5_byte_order,
26666 m_hash_table.size () + 1);
26667 for (const hash_it_pair &hashitpair : hashitlist)
26669 m_hash_table.push_back (0);
26670 store_unsigned_integer (reinterpret_cast<gdb_byte *>
26671 (&m_hash_table.back ()),
26672 sizeof (m_hash_table.back ()),
26673 m_dwarf5_byte_order, hashitpair.hash);
26674 const c_str_view &name = hashitpair.it->first;
26675 const std::set<symbol_value> &value_set = hashitpair.it->second;
26676 m_name_table_string_offs.push_back_reorder
26677 (m_debugstrlookup.lookup (name.c_str ()));
26678 m_name_table_entry_offs.push_back_reorder (m_entry_pool.size ());
26679 gdb_assert (!value_set.empty ());
26680 for (const symbol_value &value : value_set)
26682 int &idx = m_indexkey_to_idx[index_key (value.dwarf_tag,
26687 idx = m_idx_next++;
26688 m_abbrev_table.append_unsigned_leb128 (idx);
26689 m_abbrev_table.append_unsigned_leb128 (value.dwarf_tag);
26690 m_abbrev_table.append_unsigned_leb128
26691 (value.kind == unit_kind::cu ? DW_IDX_compile_unit
26692 : DW_IDX_type_unit);
26693 m_abbrev_table.append_unsigned_leb128 (DW_FORM_udata);
26694 m_abbrev_table.append_unsigned_leb128 (value.is_static
26695 ? DW_IDX_GNU_internal
26696 : DW_IDX_GNU_external);
26697 m_abbrev_table.append_unsigned_leb128 (DW_FORM_flag_present);
26699 /* Terminate attributes list. */
26700 m_abbrev_table.append_unsigned_leb128 (0);
26701 m_abbrev_table.append_unsigned_leb128 (0);
26704 m_entry_pool.append_unsigned_leb128 (idx);
26705 m_entry_pool.append_unsigned_leb128 (value.cu_index);
26708 /* Terminate the list of CUs. */
26709 m_entry_pool.append_unsigned_leb128 (0);
26712 gdb_assert (m_hash_table.size () == name_count);
26714 /* Terminate tags list. */
26715 m_abbrev_table.append_unsigned_leb128 (0);
26718 /* Return .debug_names bucket count. This must be called only after
26719 calling the build method. */
26720 uint32_t bucket_count () const
26722 /* Verify the build method has been already called. */
26723 gdb_assert (!m_abbrev_table.empty ());
26724 const uint32_t retval = m_bucket_table.size ();
26726 /* Check for overflow. */
26727 gdb_assert (retval == m_bucket_table.size ());
26731 /* Return .debug_names names count. This must be called only after
26732 calling the build method. */
26733 uint32_t name_count () const
26735 /* Verify the build method has been already called. */
26736 gdb_assert (!m_abbrev_table.empty ());
26737 const uint32_t retval = m_hash_table.size ();
26739 /* Check for overflow. */
26740 gdb_assert (retval == m_hash_table.size ());
26744 /* Return number of bytes of .debug_names abbreviation table. This
26745 must be called only after calling the build method. */
26746 uint32_t abbrev_table_bytes () const
26748 gdb_assert (!m_abbrev_table.empty ());
26749 return m_abbrev_table.size ();
26752 /* Recurse into all "included" dependencies and store their symbols
26753 as if they appeared in this psymtab. */
26754 void recursively_write_psymbols
26755 (struct objfile *objfile,
26756 struct partial_symtab *psymtab,
26757 std::unordered_set<partial_symbol *> &psyms_seen,
26760 for (int i = 0; i < psymtab->number_of_dependencies; ++i)
26761 if (psymtab->dependencies[i]->user != NULL)
26762 recursively_write_psymbols (objfile, psymtab->dependencies[i],
26763 psyms_seen, cu_index);
26765 write_psymbols (psyms_seen,
26766 &objfile->global_psymbols[psymtab->globals_offset],
26767 psymtab->n_global_syms, cu_index, false, unit_kind::cu);
26768 write_psymbols (psyms_seen,
26769 &objfile->static_psymbols[psymtab->statics_offset],
26770 psymtab->n_static_syms, cu_index, true, unit_kind::cu);
26773 /* Return number of bytes the .debug_names section will have. This
26774 must be called only after calling the build method. */
26775 size_t bytes () const
26777 /* Verify the build method has been already called. */
26778 gdb_assert (!m_abbrev_table.empty ());
26779 size_t expected_bytes = 0;
26780 expected_bytes += m_bucket_table.size () * sizeof (m_bucket_table[0]);
26781 expected_bytes += m_hash_table.size () * sizeof (m_hash_table[0]);
26782 expected_bytes += m_name_table_string_offs.bytes ();
26783 expected_bytes += m_name_table_entry_offs.bytes ();
26784 expected_bytes += m_abbrev_table.size ();
26785 expected_bytes += m_entry_pool.size ();
26786 return expected_bytes;
26789 /* Write .debug_names to FILE_NAMES and .debug_str addition to
26790 FILE_STR. This must be called only after calling the build
26792 void file_write (FILE *file_names, FILE *file_str) const
26794 /* Verify the build method has been already called. */
26795 gdb_assert (!m_abbrev_table.empty ());
26796 ::file_write (file_names, m_bucket_table);
26797 ::file_write (file_names, m_hash_table);
26798 m_name_table_string_offs.file_write (file_names);
26799 m_name_table_entry_offs.file_write (file_names);
26800 m_abbrev_table.file_write (file_names);
26801 m_entry_pool.file_write (file_names);
26802 m_debugstrlookup.file_write (file_str);
26805 /* A helper user data for write_one_signatured_type. */
26806 class write_one_signatured_type_data
26809 write_one_signatured_type_data (debug_names &nametable_,
26810 signatured_type_index_data &&info_)
26811 : nametable (nametable_), info (std::move (info_))
26813 debug_names &nametable;
26814 struct signatured_type_index_data info;
26817 /* A helper function to pass write_one_signatured_type to
26818 htab_traverse_noresize. */
26820 write_one_signatured_type (void **slot, void *d)
26822 write_one_signatured_type_data *data = (write_one_signatured_type_data *) d;
26823 struct signatured_type_index_data *info = &data->info;
26824 struct signatured_type *entry = (struct signatured_type *) *slot;
26826 data->nametable.write_one_signatured_type (entry, info);
26833 /* Storage for symbol names mapping them to their .debug_str section
26835 class debug_str_lookup
26839 /* Object costructor to be called for current DWARF2_PER_OBJFILE.
26840 All .debug_str section strings are automatically stored. */
26841 debug_str_lookup (struct dwarf2_per_objfile *dwarf2_per_objfile)
26842 : m_abfd (dwarf2_per_objfile->objfile->obfd),
26843 m_dwarf2_per_objfile (dwarf2_per_objfile)
26845 dwarf2_read_section (dwarf2_per_objfile->objfile,
26846 &dwarf2_per_objfile->str);
26847 if (dwarf2_per_objfile->str.buffer == NULL)
26849 for (const gdb_byte *data = dwarf2_per_objfile->str.buffer;
26850 data < (dwarf2_per_objfile->str.buffer
26851 + dwarf2_per_objfile->str.size);)
26853 const char *const s = reinterpret_cast<const char *> (data);
26854 const auto insertpair
26855 = m_str_table.emplace (c_str_view (s),
26856 data - dwarf2_per_objfile->str.buffer);
26857 if (!insertpair.second)
26858 complaint (&symfile_complaints,
26859 _("Duplicate string \"%s\" in "
26860 ".debug_str section [in module %s]"),
26861 s, bfd_get_filename (m_abfd));
26862 data += strlen (s) + 1;
26866 /* Return offset of symbol name S in the .debug_str section. Add
26867 such symbol to the section's end if it does not exist there
26869 size_t lookup (const char *s)
26871 const auto it = m_str_table.find (c_str_view (s));
26872 if (it != m_str_table.end ())
26874 const size_t offset = (m_dwarf2_per_objfile->str.size
26875 + m_str_add_buf.size ());
26876 m_str_table.emplace (c_str_view (s), offset);
26877 m_str_add_buf.append_cstr0 (s);
26881 /* Append the end of the .debug_str section to FILE. */
26882 void file_write (FILE *file) const
26884 m_str_add_buf.file_write (file);
26888 std::unordered_map<c_str_view, size_t, c_str_view_hasher> m_str_table;
26890 struct dwarf2_per_objfile *m_dwarf2_per_objfile;
26892 /* Data to add at the end of .debug_str for new needed symbol names. */
26893 data_buf m_str_add_buf;
26896 /* Container to map used DWARF tags to their .debug_names abbreviation
26901 index_key (int dwarf_tag_, bool is_static_, unit_kind kind_)
26902 : dwarf_tag (dwarf_tag_), is_static (is_static_), kind (kind_)
26907 operator== (const index_key &other) const
26909 return (dwarf_tag == other.dwarf_tag && is_static == other.is_static
26910 && kind == other.kind);
26913 const int dwarf_tag;
26914 const bool is_static;
26915 const unit_kind kind;
26918 /* Provide std::unordered_map::hasher for index_key. */
26919 class index_key_hasher
26923 operator () (const index_key &key) const
26925 return (std::hash<int>() (key.dwarf_tag) << 1) | key.is_static;
26929 /* Parameters of one symbol entry. */
26933 const int dwarf_tag, cu_index;
26934 const bool is_static;
26935 const unit_kind kind;
26937 symbol_value (int dwarf_tag_, int cu_index_, bool is_static_,
26939 : dwarf_tag (dwarf_tag_), cu_index (cu_index_), is_static (is_static_),
26944 operator< (const symbol_value &other) const
26964 /* Abstract base class to unify DWARF-32 and DWARF-64 name table
26969 const bfd_endian dwarf5_byte_order;
26971 explicit offset_vec (bfd_endian dwarf5_byte_order_)
26972 : dwarf5_byte_order (dwarf5_byte_order_)
26975 /* Call std::vector::reserve for NELEM elements. */
26976 virtual void reserve (size_t nelem) = 0;
26978 /* Call std::vector::push_back with store_unsigned_integer byte
26979 reordering for ELEM. */
26980 virtual void push_back_reorder (size_t elem) = 0;
26982 /* Return expected output size in bytes. */
26983 virtual size_t bytes () const = 0;
26985 /* Write name table to FILE. */
26986 virtual void file_write (FILE *file) const = 0;
26989 /* Template to unify DWARF-32 and DWARF-64 output. */
26990 template<typename OffsetSize>
26991 class offset_vec_tmpl : public offset_vec
26994 explicit offset_vec_tmpl (bfd_endian dwarf5_byte_order_)
26995 : offset_vec (dwarf5_byte_order_)
26998 /* Implement offset_vec::reserve. */
26999 void reserve (size_t nelem) override
27001 m_vec.reserve (nelem);
27004 /* Implement offset_vec::push_back_reorder. */
27005 void push_back_reorder (size_t elem) override
27007 m_vec.push_back (elem);
27008 /* Check for overflow. */
27009 gdb_assert (m_vec.back () == elem);
27010 store_unsigned_integer (reinterpret_cast<gdb_byte *> (&m_vec.back ()),
27011 sizeof (m_vec.back ()), dwarf5_byte_order, elem);
27014 /* Implement offset_vec::bytes. */
27015 size_t bytes () const override
27017 return m_vec.size () * sizeof (m_vec[0]);
27020 /* Implement offset_vec::file_write. */
27021 void file_write (FILE *file) const override
27023 ::file_write (file, m_vec);
27027 std::vector<OffsetSize> m_vec;
27030 /* Base class to unify DWARF-32 and DWARF-64 .debug_names output
27031 respecting name table width. */
27035 offset_vec &name_table_string_offs, &name_table_entry_offs;
27037 dwarf (offset_vec &name_table_string_offs_,
27038 offset_vec &name_table_entry_offs_)
27039 : name_table_string_offs (name_table_string_offs_),
27040 name_table_entry_offs (name_table_entry_offs_)
27045 /* Template to unify DWARF-32 and DWARF-64 .debug_names output
27046 respecting name table width. */
27047 template<typename OffsetSize>
27048 class dwarf_tmpl : public dwarf
27051 explicit dwarf_tmpl (bfd_endian dwarf5_byte_order_)
27052 : dwarf (m_name_table_string_offs, m_name_table_entry_offs),
27053 m_name_table_string_offs (dwarf5_byte_order_),
27054 m_name_table_entry_offs (dwarf5_byte_order_)
27058 offset_vec_tmpl<OffsetSize> m_name_table_string_offs;
27059 offset_vec_tmpl<OffsetSize> m_name_table_entry_offs;
27062 /* Try to reconstruct original DWARF tag for given partial_symbol.
27063 This function is not DWARF-5 compliant but it is sufficient for
27064 GDB as a DWARF-5 index consumer. */
27065 static int psymbol_tag (const struct partial_symbol *psym)
27067 domain_enum domain = PSYMBOL_DOMAIN (psym);
27068 enum address_class aclass = PSYMBOL_CLASS (psym);
27076 return DW_TAG_subprogram;
27078 return DW_TAG_typedef;
27080 case LOC_CONST_BYTES:
27081 case LOC_OPTIMIZED_OUT:
27083 return DW_TAG_variable;
27085 /* Note: It's currently impossible to recognize psyms as enum values
27086 short of reading the type info. For now punt. */
27087 return DW_TAG_variable;
27089 /* There are other LOC_FOO values that one might want to classify
27090 as variables, but dwarf2read.c doesn't currently use them. */
27091 return DW_TAG_variable;
27093 case STRUCT_DOMAIN:
27094 return DW_TAG_structure_type;
27100 /* Call insert for all partial symbols and mark them in PSYMS_SEEN. */
27101 void write_psymbols (std::unordered_set<partial_symbol *> &psyms_seen,
27102 struct partial_symbol **psymp, int count, int cu_index,
27103 bool is_static, unit_kind kind)
27105 for (; count-- > 0; ++psymp)
27107 struct partial_symbol *psym = *psymp;
27109 if (SYMBOL_LANGUAGE (psym) == language_ada)
27110 error (_("Ada is not currently supported by the index"));
27112 /* Only add a given psymbol once. */
27113 if (psyms_seen.insert (psym).second)
27114 insert (psym, cu_index, is_static, kind);
27118 /* A helper function that writes a single signatured_type
27119 to a debug_names. */
27121 write_one_signatured_type (struct signatured_type *entry,
27122 struct signatured_type_index_data *info)
27124 struct partial_symtab *psymtab = entry->per_cu.v.psymtab;
27126 write_psymbols (info->psyms_seen,
27127 &info->objfile->global_psymbols[psymtab->globals_offset],
27128 psymtab->n_global_syms, info->cu_index, false,
27130 write_psymbols (info->psyms_seen,
27131 &info->objfile->static_psymbols[psymtab->statics_offset],
27132 psymtab->n_static_syms, info->cu_index, true,
27135 info->types_list.append_uint (dwarf5_offset_size (), m_dwarf5_byte_order,
27136 to_underlying (entry->per_cu.sect_off));
27141 /* Store value of each symbol. */
27142 std::unordered_map<c_str_view, std::set<symbol_value>, c_str_view_hasher>
27143 m_name_to_value_set;
27145 /* Tables of DWARF-5 .debug_names. They are in object file byte
27147 std::vector<uint32_t> m_bucket_table;
27148 std::vector<uint32_t> m_hash_table;
27150 const bfd_endian m_dwarf5_byte_order;
27151 dwarf_tmpl<uint32_t> m_dwarf32;
27152 dwarf_tmpl<uint64_t> m_dwarf64;
27154 offset_vec &m_name_table_string_offs, &m_name_table_entry_offs;
27155 debug_str_lookup m_debugstrlookup;
27157 /* Map each used .debug_names abbreviation tag parameter to its
27159 std::unordered_map<index_key, int, index_key_hasher> m_indexkey_to_idx;
27161 /* Next unused .debug_names abbreviation tag for
27162 m_indexkey_to_idx. */
27163 int m_idx_next = 1;
27165 /* .debug_names abbreviation table. */
27166 data_buf m_abbrev_table;
27168 /* .debug_names entry pool. */
27169 data_buf m_entry_pool;
27172 /* Return iff any of the needed offsets does not fit into 32-bit
27173 .debug_names section. */
27176 check_dwarf64_offsets (struct dwarf2_per_objfile *dwarf2_per_objfile)
27178 for (int i = 0; i < dwarf2_per_objfile->n_comp_units; ++i)
27180 const dwarf2_per_cu_data &per_cu = *dwarf2_per_objfile->all_comp_units[i];
27182 if (to_underlying (per_cu.sect_off) >= (static_cast<uint64_t> (1) << 32))
27185 for (int i = 0; i < dwarf2_per_objfile->n_type_units; ++i)
27187 const signatured_type &sigtype = *dwarf2_per_objfile->all_type_units[i];
27188 const dwarf2_per_cu_data &per_cu = sigtype.per_cu;
27190 if (to_underlying (per_cu.sect_off) >= (static_cast<uint64_t> (1) << 32))
27196 /* The psyms_seen set is potentially going to be largish (~40k
27197 elements when indexing a -g3 build of GDB itself). Estimate the
27198 number of elements in order to avoid too many rehashes, which
27199 require rebuilding buckets and thus many trips to
27203 psyms_seen_size (struct dwarf2_per_objfile *dwarf2_per_objfile)
27205 size_t psyms_count = 0;
27206 for (int i = 0; i < dwarf2_per_objfile->n_comp_units; ++i)
27208 struct dwarf2_per_cu_data *per_cu
27209 = dwarf2_per_objfile->all_comp_units[i];
27210 struct partial_symtab *psymtab = per_cu->v.psymtab;
27212 if (psymtab != NULL && psymtab->user == NULL)
27213 recursively_count_psymbols (psymtab, psyms_count);
27215 /* Generating an index for gdb itself shows a ratio of
27216 TOTAL_SEEN_SYMS/UNIQUE_SYMS or ~5. 4 seems like a good bet. */
27217 return psyms_count / 4;
27220 /* Write new .gdb_index section for OBJFILE into OUT_FILE.
27221 Return how many bytes were expected to be written into OUT_FILE. */
27224 write_gdbindex (struct dwarf2_per_objfile *dwarf2_per_objfile, FILE *out_file)
27226 struct objfile *objfile = dwarf2_per_objfile->objfile;
27227 mapped_symtab symtab;
27230 /* While we're scanning CU's create a table that maps a psymtab pointer
27231 (which is what addrmap records) to its index (which is what is recorded
27232 in the index file). This will later be needed to write the address
27234 psym_index_map cu_index_htab;
27235 cu_index_htab.reserve (dwarf2_per_objfile->n_comp_units);
27237 /* The CU list is already sorted, so we don't need to do additional
27238 work here. Also, the debug_types entries do not appear in
27239 all_comp_units, but only in their own hash table. */
27241 std::unordered_set<partial_symbol *> psyms_seen
27242 (psyms_seen_size (dwarf2_per_objfile));
27243 for (int i = 0; i < dwarf2_per_objfile->n_comp_units; ++i)
27245 struct dwarf2_per_cu_data *per_cu
27246 = dwarf2_per_objfile->all_comp_units[i];
27247 struct partial_symtab *psymtab = per_cu->v.psymtab;
27249 /* CU of a shared file from 'dwz -m' may be unused by this main file.
27250 It may be referenced from a local scope but in such case it does not
27251 need to be present in .gdb_index. */
27252 if (psymtab == NULL)
27255 if (psymtab->user == NULL)
27256 recursively_write_psymbols (objfile, psymtab, &symtab,
27259 const auto insertpair = cu_index_htab.emplace (psymtab, i);
27260 gdb_assert (insertpair.second);
27262 cu_list.append_uint (8, BFD_ENDIAN_LITTLE,
27263 to_underlying (per_cu->sect_off));
27264 cu_list.append_uint (8, BFD_ENDIAN_LITTLE, per_cu->length);
27267 /* Dump the address map. */
27269 write_address_map (objfile, addr_vec, cu_index_htab);
27271 /* Write out the .debug_type entries, if any. */
27272 data_buf types_cu_list;
27273 if (dwarf2_per_objfile->signatured_types)
27275 signatured_type_index_data sig_data (types_cu_list,
27278 sig_data.objfile = objfile;
27279 sig_data.symtab = &symtab;
27280 sig_data.cu_index = dwarf2_per_objfile->n_comp_units;
27281 htab_traverse_noresize (dwarf2_per_objfile->signatured_types,
27282 write_one_signatured_type, &sig_data);
27285 /* Now that we've processed all symbols we can shrink their cu_indices
27287 uniquify_cu_indices (&symtab);
27289 data_buf symtab_vec, constant_pool;
27290 write_hash_table (&symtab, symtab_vec, constant_pool);
27293 const offset_type size_of_contents = 6 * sizeof (offset_type);
27294 offset_type total_len = size_of_contents;
27296 /* The version number. */
27297 contents.append_data (MAYBE_SWAP (8));
27299 /* The offset of the CU list from the start of the file. */
27300 contents.append_data (MAYBE_SWAP (total_len));
27301 total_len += cu_list.size ();
27303 /* The offset of the types CU list from the start of the file. */
27304 contents.append_data (MAYBE_SWAP (total_len));
27305 total_len += types_cu_list.size ();
27307 /* The offset of the address table from the start of the file. */
27308 contents.append_data (MAYBE_SWAP (total_len));
27309 total_len += addr_vec.size ();
27311 /* The offset of the symbol table from the start of the file. */
27312 contents.append_data (MAYBE_SWAP (total_len));
27313 total_len += symtab_vec.size ();
27315 /* The offset of the constant pool from the start of the file. */
27316 contents.append_data (MAYBE_SWAP (total_len));
27317 total_len += constant_pool.size ();
27319 gdb_assert (contents.size () == size_of_contents);
27321 contents.file_write (out_file);
27322 cu_list.file_write (out_file);
27323 types_cu_list.file_write (out_file);
27324 addr_vec.file_write (out_file);
27325 symtab_vec.file_write (out_file);
27326 constant_pool.file_write (out_file);
27331 /* DWARF-5 augmentation string for GDB's DW_IDX_GNU_* extension. */
27332 static const gdb_byte dwarf5_gdb_augmentation[] = { 'G', 'D', 'B', 0 };
27334 /* Write a new .debug_names section for OBJFILE into OUT_FILE, write
27335 needed addition to .debug_str section to OUT_FILE_STR. Return how
27336 many bytes were expected to be written into OUT_FILE. */
27339 write_debug_names (struct dwarf2_per_objfile *dwarf2_per_objfile,
27340 FILE *out_file, FILE *out_file_str)
27342 const bool dwarf5_is_dwarf64 = check_dwarf64_offsets (dwarf2_per_objfile);
27343 struct objfile *objfile = dwarf2_per_objfile->objfile;
27344 const enum bfd_endian dwarf5_byte_order
27345 = gdbarch_byte_order (get_objfile_arch (objfile));
27347 /* The CU list is already sorted, so we don't need to do additional
27348 work here. Also, the debug_types entries do not appear in
27349 all_comp_units, but only in their own hash table. */
27351 debug_names nametable (dwarf2_per_objfile, dwarf5_is_dwarf64,
27352 dwarf5_byte_order);
27353 std::unordered_set<partial_symbol *>
27354 psyms_seen (psyms_seen_size (dwarf2_per_objfile));
27355 for (int i = 0; i < dwarf2_per_objfile->n_comp_units; ++i)
27357 const dwarf2_per_cu_data *per_cu = dwarf2_per_objfile->all_comp_units[i];
27358 partial_symtab *psymtab = per_cu->v.psymtab;
27360 /* CU of a shared file from 'dwz -m' may be unused by this main
27361 file. It may be referenced from a local scope but in such
27362 case it does not need to be present in .debug_names. */
27363 if (psymtab == NULL)
27366 if (psymtab->user == NULL)
27367 nametable.recursively_write_psymbols (objfile, psymtab, psyms_seen, i);
27369 cu_list.append_uint (nametable.dwarf5_offset_size (), dwarf5_byte_order,
27370 to_underlying (per_cu->sect_off));
27373 /* Write out the .debug_type entries, if any. */
27374 data_buf types_cu_list;
27375 if (dwarf2_per_objfile->signatured_types)
27377 debug_names::write_one_signatured_type_data sig_data (nametable,
27378 signatured_type_index_data (types_cu_list, psyms_seen));
27380 sig_data.info.objfile = objfile;
27381 /* It is used only for gdb_index. */
27382 sig_data.info.symtab = nullptr;
27383 sig_data.info.cu_index = 0;
27384 htab_traverse_noresize (dwarf2_per_objfile->signatured_types,
27385 debug_names::write_one_signatured_type,
27389 nametable.build ();
27391 /* No addr_vec - DWARF-5 uses .debug_aranges generated by GCC. */
27393 const offset_type bytes_of_header
27394 = ((dwarf5_is_dwarf64 ? 12 : 4)
27396 + sizeof (dwarf5_gdb_augmentation));
27397 size_t expected_bytes = 0;
27398 expected_bytes += bytes_of_header;
27399 expected_bytes += cu_list.size ();
27400 expected_bytes += types_cu_list.size ();
27401 expected_bytes += nametable.bytes ();
27404 if (!dwarf5_is_dwarf64)
27406 const uint64_t size64 = expected_bytes - 4;
27407 gdb_assert (size64 < 0xfffffff0);
27408 header.append_uint (4, dwarf5_byte_order, size64);
27412 header.append_uint (4, dwarf5_byte_order, 0xffffffff);
27413 header.append_uint (8, dwarf5_byte_order, expected_bytes - 12);
27416 /* The version number. */
27417 header.append_uint (2, dwarf5_byte_order, 5);
27420 header.append_uint (2, dwarf5_byte_order, 0);
27422 /* comp_unit_count - The number of CUs in the CU list. */
27423 header.append_uint (4, dwarf5_byte_order, dwarf2_per_objfile->n_comp_units);
27425 /* local_type_unit_count - The number of TUs in the local TU
27427 header.append_uint (4, dwarf5_byte_order, dwarf2_per_objfile->n_type_units);
27429 /* foreign_type_unit_count - The number of TUs in the foreign TU
27431 header.append_uint (4, dwarf5_byte_order, 0);
27433 /* bucket_count - The number of hash buckets in the hash lookup
27435 header.append_uint (4, dwarf5_byte_order, nametable.bucket_count ());
27437 /* name_count - The number of unique names in the index. */
27438 header.append_uint (4, dwarf5_byte_order, nametable.name_count ());
27440 /* abbrev_table_size - The size in bytes of the abbreviations
27442 header.append_uint (4, dwarf5_byte_order, nametable.abbrev_table_bytes ());
27444 /* augmentation_string_size - The size in bytes of the augmentation
27445 string. This value is rounded up to a multiple of 4. */
27446 static_assert (sizeof (dwarf5_gdb_augmentation) % 4 == 0, "");
27447 header.append_uint (4, dwarf5_byte_order, sizeof (dwarf5_gdb_augmentation));
27448 header.append_data (dwarf5_gdb_augmentation);
27450 gdb_assert (header.size () == bytes_of_header);
27452 header.file_write (out_file);
27453 cu_list.file_write (out_file);
27454 types_cu_list.file_write (out_file);
27455 nametable.file_write (out_file, out_file_str);
27457 return expected_bytes;
27460 /* Assert that FILE's size is EXPECTED_SIZE. Assumes file's seek
27461 position is at the end of the file. */
27464 assert_file_size (FILE *file, const char *filename, size_t expected_size)
27466 const auto file_size = ftell (file);
27467 if (file_size == -1)
27468 error (_("Can't get `%s' size"), filename);
27469 gdb_assert (file_size == expected_size);
27472 /* Create an index file for OBJFILE in the directory DIR. */
27475 write_psymtabs_to_index (struct dwarf2_per_objfile *dwarf2_per_objfile,
27477 dw_index_kind index_kind)
27479 struct objfile *objfile = dwarf2_per_objfile->objfile;
27481 if (dwarf2_per_objfile->using_index)
27482 error (_("Cannot use an index to create the index"));
27484 if (VEC_length (dwarf2_section_info_def, dwarf2_per_objfile->types) > 1)
27485 error (_("Cannot make an index when the file has multiple .debug_types sections"));
27487 if (!objfile->psymtabs || !objfile->psymtabs_addrmap)
27491 if (stat (objfile_name (objfile), &st) < 0)
27492 perror_with_name (objfile_name (objfile));
27494 std::string filename (std::string (dir) + SLASH_STRING
27495 + lbasename (objfile_name (objfile))
27496 + (index_kind == dw_index_kind::DEBUG_NAMES
27497 ? INDEX5_SUFFIX : INDEX4_SUFFIX));
27499 FILE *out_file = gdb_fopen_cloexec (filename.c_str (), "wb").release ();
27501 error (_("Can't open `%s' for writing"), filename.c_str ());
27503 /* Order matters here; we want FILE to be closed before FILENAME is
27504 unlinked, because on MS-Windows one cannot delete a file that is
27505 still open. (Don't call anything here that might throw until
27506 file_closer is created.) */
27507 gdb::unlinker unlink_file (filename.c_str ());
27508 gdb_file_up close_out_file (out_file);
27510 if (index_kind == dw_index_kind::DEBUG_NAMES)
27512 std::string filename_str (std::string (dir) + SLASH_STRING
27513 + lbasename (objfile_name (objfile))
27514 + DEBUG_STR_SUFFIX);
27516 = gdb_fopen_cloexec (filename_str.c_str (), "wb").release ();
27518 error (_("Can't open `%s' for writing"), filename_str.c_str ());
27519 gdb::unlinker unlink_file_str (filename_str.c_str ());
27520 gdb_file_up close_out_file_str (out_file_str);
27522 const size_t total_len
27523 = write_debug_names (dwarf2_per_objfile, out_file, out_file_str);
27524 assert_file_size (out_file, filename.c_str (), total_len);
27526 /* We want to keep the file .debug_str file too. */
27527 unlink_file_str.keep ();
27531 const size_t total_len
27532 = write_gdbindex (dwarf2_per_objfile, out_file);
27533 assert_file_size (out_file, filename.c_str (), total_len);
27536 /* We want to keep the file. */
27537 unlink_file.keep ();
27540 /* Implementation of the `save gdb-index' command.
27542 Note that the .gdb_index file format used by this command is
27543 documented in the GDB manual. Any changes here must be documented
27547 save_gdb_index_command (const char *arg, int from_tty)
27549 struct objfile *objfile;
27550 const char dwarf5space[] = "-dwarf-5 ";
27551 dw_index_kind index_kind = dw_index_kind::GDB_INDEX;
27556 arg = skip_spaces (arg);
27557 if (strncmp (arg, dwarf5space, strlen (dwarf5space)) == 0)
27559 index_kind = dw_index_kind::DEBUG_NAMES;
27560 arg += strlen (dwarf5space);
27561 arg = skip_spaces (arg);
27565 error (_("usage: save gdb-index [-dwarf-5] DIRECTORY"));
27567 ALL_OBJFILES (objfile)
27571 /* If the objfile does not correspond to an actual file, skip it. */
27572 if (stat (objfile_name (objfile), &st) < 0)
27575 struct dwarf2_per_objfile *dwarf2_per_objfile
27576 = get_dwarf2_per_objfile (objfile);
27578 if (dwarf2_per_objfile != NULL)
27582 write_psymtabs_to_index (dwarf2_per_objfile, arg, index_kind);
27584 CATCH (except, RETURN_MASK_ERROR)
27586 exception_fprintf (gdb_stderr, except,
27587 _("Error while writing index for `%s': "),
27588 objfile_name (objfile));
27598 int dwarf_always_disassemble;
27601 show_dwarf_always_disassemble (struct ui_file *file, int from_tty,
27602 struct cmd_list_element *c, const char *value)
27604 fprintf_filtered (file,
27605 _("Whether to always disassemble "
27606 "DWARF expressions is %s.\n"),
27611 show_check_physname (struct ui_file *file, int from_tty,
27612 struct cmd_list_element *c, const char *value)
27614 fprintf_filtered (file,
27615 _("Whether to check \"physname\" is %s.\n"),
27620 _initialize_dwarf2_read (void)
27622 struct cmd_list_element *c;
27624 dwarf2_objfile_data_key = register_objfile_data ();
27626 add_prefix_cmd ("dwarf", class_maintenance, set_dwarf_cmd, _("\
27627 Set DWARF specific variables.\n\
27628 Configure DWARF variables such as the cache size"),
27629 &set_dwarf_cmdlist, "maintenance set dwarf ",
27630 0/*allow-unknown*/, &maintenance_set_cmdlist);
27632 add_prefix_cmd ("dwarf", class_maintenance, show_dwarf_cmd, _("\
27633 Show DWARF specific variables\n\
27634 Show DWARF variables such as the cache size"),
27635 &show_dwarf_cmdlist, "maintenance show dwarf ",
27636 0/*allow-unknown*/, &maintenance_show_cmdlist);
27638 add_setshow_zinteger_cmd ("max-cache-age", class_obscure,
27639 &dwarf_max_cache_age, _("\
27640 Set the upper bound on the age of cached DWARF compilation units."), _("\
27641 Show the upper bound on the age of cached DWARF compilation units."), _("\
27642 A higher limit means that cached compilation units will be stored\n\
27643 in memory longer, and more total memory will be used. Zero disables\n\
27644 caching, which can slow down startup."),
27646 show_dwarf_max_cache_age,
27647 &set_dwarf_cmdlist,
27648 &show_dwarf_cmdlist);
27650 add_setshow_boolean_cmd ("always-disassemble", class_obscure,
27651 &dwarf_always_disassemble, _("\
27652 Set whether `info address' always disassembles DWARF expressions."), _("\
27653 Show whether `info address' always disassembles DWARF expressions."), _("\
27654 When enabled, DWARF expressions are always printed in an assembly-like\n\
27655 syntax. When disabled, expressions will be printed in a more\n\
27656 conversational style, when possible."),
27658 show_dwarf_always_disassemble,
27659 &set_dwarf_cmdlist,
27660 &show_dwarf_cmdlist);
27662 add_setshow_zuinteger_cmd ("dwarf-read", no_class, &dwarf_read_debug, _("\
27663 Set debugging of the DWARF reader."), _("\
27664 Show debugging of the DWARF reader."), _("\
27665 When enabled (non-zero), debugging messages are printed during DWARF\n\
27666 reading and symtab expansion. A value of 1 (one) provides basic\n\
27667 information. A value greater than 1 provides more verbose information."),
27670 &setdebuglist, &showdebuglist);
27672 add_setshow_zuinteger_cmd ("dwarf-die", no_class, &dwarf_die_debug, _("\
27673 Set debugging of the DWARF DIE reader."), _("\
27674 Show debugging of the DWARF DIE reader."), _("\
27675 When enabled (non-zero), DIEs are dumped after they are read in.\n\
27676 The value is the maximum depth to print."),
27679 &setdebuglist, &showdebuglist);
27681 add_setshow_zuinteger_cmd ("dwarf-line", no_class, &dwarf_line_debug, _("\
27682 Set debugging of the dwarf line reader."), _("\
27683 Show debugging of the dwarf line reader."), _("\
27684 When enabled (non-zero), line number entries are dumped as they are read in.\n\
27685 A value of 1 (one) provides basic information.\n\
27686 A value greater than 1 provides more verbose information."),
27689 &setdebuglist, &showdebuglist);
27691 add_setshow_boolean_cmd ("check-physname", no_class, &check_physname, _("\
27692 Set cross-checking of \"physname\" code against demangler."), _("\
27693 Show cross-checking of \"physname\" code against demangler."), _("\
27694 When enabled, GDB's internal \"physname\" code is checked against\n\
27696 NULL, show_check_physname,
27697 &setdebuglist, &showdebuglist);
27699 add_setshow_boolean_cmd ("use-deprecated-index-sections",
27700 no_class, &use_deprecated_index_sections, _("\
27701 Set whether to use deprecated gdb_index sections."), _("\
27702 Show whether to use deprecated gdb_index sections."), _("\
27703 When enabled, deprecated .gdb_index sections are used anyway.\n\
27704 Normally they are ignored either because of a missing feature or\n\
27705 performance issue.\n\
27706 Warning: This option must be enabled before gdb reads the file."),
27709 &setlist, &showlist);
27711 c = add_cmd ("gdb-index", class_files, save_gdb_index_command,
27713 Save a gdb-index file.\n\
27714 Usage: save gdb-index [-dwarf-5] DIRECTORY\n\
27716 No options create one file with .gdb-index extension for pre-DWARF-5\n\
27717 compatible .gdb_index section. With -dwarf-5 creates two files with\n\
27718 extension .debug_names and .debug_str for DWARF-5 .debug_names section."),
27720 set_cmd_completer (c, filename_completer);
27722 dwarf2_locexpr_index = register_symbol_computed_impl (LOC_COMPUTED,
27723 &dwarf2_locexpr_funcs);
27724 dwarf2_loclist_index = register_symbol_computed_impl (LOC_COMPUTED,
27725 &dwarf2_loclist_funcs);
27727 dwarf2_locexpr_block_index = register_symbol_block_impl (LOC_BLOCK,
27728 &dwarf2_block_frame_base_locexpr_funcs);
27729 dwarf2_loclist_block_index = register_symbol_block_impl (LOC_BLOCK,
27730 &dwarf2_block_frame_base_loclist_funcs);
27733 selftests::register_test ("dw2_expand_symtabs_matching",
27734 selftests::dw2_expand_symtabs_matching::run_test);