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>
90 /* When == 1, print basic high level tracing messages.
91 When > 1, be more verbose.
92 This is in contrast to the low level DIE reading of dwarf_die_debug. */
93 static unsigned int dwarf_read_debug = 0;
95 /* When non-zero, dump DIEs after they are read in. */
96 static unsigned int dwarf_die_debug = 0;
98 /* When non-zero, dump line number entries as they are read in. */
99 static unsigned int dwarf_line_debug = 0;
101 /* When non-zero, cross-check physname against demangler. */
102 static int check_physname = 0;
104 /* When non-zero, do not reject deprecated .gdb_index sections. */
105 static int use_deprecated_index_sections = 0;
107 static const struct objfile_data *dwarf2_objfile_data_key;
109 /* The "aclass" indices for various kinds of computed DWARF symbols. */
111 static int dwarf2_locexpr_index;
112 static int dwarf2_loclist_index;
113 static int dwarf2_locexpr_block_index;
114 static int dwarf2_loclist_block_index;
116 /* A descriptor for dwarf sections.
118 S.ASECTION, SIZE are typically initialized when the objfile is first
119 scanned. BUFFER, READIN are filled in later when the section is read.
120 If the section contained compressed data then SIZE is updated to record
121 the uncompressed size of the section.
123 DWP file format V2 introduces a wrinkle that is easiest to handle by
124 creating the concept of virtual sections contained within a real section.
125 In DWP V2 the sections of the input DWO files are concatenated together
126 into one section, but section offsets are kept relative to the original
128 If this is a virtual dwp-v2 section, S.CONTAINING_SECTION is a backlink to
129 the real section this "virtual" section is contained in, and BUFFER,SIZE
130 describe the virtual section. */
132 struct dwarf2_section_info
136 /* If this is a real section, the bfd section. */
138 /* If this is a virtual section, pointer to the containing ("real")
140 struct dwarf2_section_info *containing_section;
142 /* Pointer to section data, only valid if readin. */
143 const gdb_byte *buffer;
144 /* The size of the section, real or virtual. */
146 /* If this is a virtual section, the offset in the real section.
147 Only valid if is_virtual. */
148 bfd_size_type virtual_offset;
149 /* True if we have tried to read this section. */
151 /* True if this is a virtual section, False otherwise.
152 This specifies which of s.section and s.containing_section to use. */
156 typedef struct dwarf2_section_info dwarf2_section_info_def;
157 DEF_VEC_O (dwarf2_section_info_def);
159 /* All offsets in the index are of this type. It must be
160 architecture-independent. */
161 typedef uint32_t offset_type;
163 DEF_VEC_I (offset_type);
165 /* Ensure only legit values are used. */
166 #define DW2_GDB_INDEX_SYMBOL_STATIC_SET_VALUE(cu_index, value) \
168 gdb_assert ((unsigned int) (value) <= 1); \
169 GDB_INDEX_SYMBOL_STATIC_SET_VALUE((cu_index), (value)); \
172 /* Ensure only legit values are used. */
173 #define DW2_GDB_INDEX_SYMBOL_KIND_SET_VALUE(cu_index, value) \
175 gdb_assert ((value) >= GDB_INDEX_SYMBOL_KIND_TYPE \
176 && (value) <= GDB_INDEX_SYMBOL_KIND_OTHER); \
177 GDB_INDEX_SYMBOL_KIND_SET_VALUE((cu_index), (value)); \
180 /* Ensure we don't use more than the alloted nuber of bits for the CU. */
181 #define DW2_GDB_INDEX_CU_SET_VALUE(cu_index, value) \
183 gdb_assert (((value) & ~GDB_INDEX_CU_MASK) == 0); \
184 GDB_INDEX_CU_SET_VALUE((cu_index), (value)); \
189 /* Convert VALUE between big- and little-endian. */
192 byte_swap (offset_type value)
196 result = (value & 0xff) << 24;
197 result |= (value & 0xff00) << 8;
198 result |= (value & 0xff0000) >> 8;
199 result |= (value & 0xff000000) >> 24;
203 #define MAYBE_SWAP(V) byte_swap (V)
206 #define MAYBE_SWAP(V) static_cast<offset_type> (V)
207 #endif /* WORDS_BIGENDIAN */
209 /* An index into a (C++) symbol name component in a symbol name as
210 recorded in the mapped_index's symbol table. For each C++ symbol
211 in the symbol table, we record one entry for the start of each
212 component in the symbol in a table of name components, and then
213 sort the table, in order to be able to binary search symbol names,
214 ignoring leading namespaces, both completion and regular look up.
215 For example, for symbol "A::B::C", we'll have an entry that points
216 to "A::B::C", another that points to "B::C", and another for "C".
217 Note that function symbols in GDB index have no parameter
218 information, just the function/method names. You can convert a
219 name_component to a "const char *" using the
220 'mapped_index::symbol_name_at(offset_type)' method. */
222 struct name_component
224 /* Offset in the symbol name where the component starts. Stored as
225 a (32-bit) offset instead of a pointer to save memory and improve
226 locality on 64-bit architectures. */
227 offset_type name_offset;
229 /* The symbol's index in the symbol and constant pool tables of a
234 /* Base class containing bits shared by both .gdb_index and
235 .debug_name indexes. */
237 struct mapped_index_base
239 /* The name_component table (a sorted vector). See name_component's
240 description above. */
241 std::vector<name_component> name_components;
243 /* How NAME_COMPONENTS is sorted. */
244 enum case_sensitivity name_components_casing;
246 /* Return the number of names in the symbol table. */
247 virtual size_t symbol_name_count () const = 0;
249 /* Get the name of the symbol at IDX in the symbol table. */
250 virtual const char *symbol_name_at (offset_type idx) const = 0;
252 /* Return whether the name at IDX in the symbol table should be
254 virtual bool symbol_name_slot_invalid (offset_type idx) const
259 /* Build the symbol name component sorted vector, if we haven't
261 void build_name_components ();
263 /* Returns the lower (inclusive) and upper (exclusive) bounds of the
264 possible matches for LN_NO_PARAMS in the name component
266 std::pair<std::vector<name_component>::const_iterator,
267 std::vector<name_component>::const_iterator>
268 find_name_components_bounds (const lookup_name_info &ln_no_params) const;
270 /* Prevent deleting/destroying via a base class pointer. */
272 ~mapped_index_base() = default;
275 /* A description of the mapped index. The file format is described in
276 a comment by the code that writes the index. */
277 struct mapped_index final : public mapped_index_base
279 /* A slot/bucket in the symbol table hash. */
280 struct symbol_table_slot
282 const offset_type name;
283 const offset_type vec;
286 /* Index data format version. */
289 /* The total length of the buffer. */
292 /* The address table data. */
293 gdb::array_view<const gdb_byte> address_table;
295 /* The symbol table, implemented as a hash table. */
296 gdb::array_view<symbol_table_slot> symbol_table;
298 /* A pointer to the constant pool. */
299 const char *constant_pool;
301 bool symbol_name_slot_invalid (offset_type idx) const override
303 const auto &bucket = this->symbol_table[idx];
304 return bucket.name == 0 && bucket.vec;
307 /* Convenience method to get at the name of the symbol at IDX in the
309 const char *symbol_name_at (offset_type idx) const override
310 { return this->constant_pool + MAYBE_SWAP (this->symbol_table[idx].name); }
312 size_t symbol_name_count () const override
313 { return this->symbol_table.size (); }
316 /* A description of the mapped .debug_names.
317 Uninitialized map has CU_COUNT 0. */
318 struct mapped_debug_names final : public mapped_index_base
320 mapped_debug_names (struct dwarf2_per_objfile *dwarf2_per_objfile_)
321 : dwarf2_per_objfile (dwarf2_per_objfile_)
324 struct dwarf2_per_objfile *dwarf2_per_objfile;
325 bfd_endian dwarf5_byte_order;
326 bool dwarf5_is_dwarf64;
327 bool augmentation_is_gdb;
329 uint32_t cu_count = 0;
330 uint32_t tu_count, bucket_count, name_count;
331 const gdb_byte *cu_table_reordered, *tu_table_reordered;
332 const uint32_t *bucket_table_reordered, *hash_table_reordered;
333 const gdb_byte *name_table_string_offs_reordered;
334 const gdb_byte *name_table_entry_offs_reordered;
335 const gdb_byte *entry_pool;
342 /* Attribute name DW_IDX_*. */
345 /* Attribute form DW_FORM_*. */
348 /* Value if FORM is DW_FORM_implicit_const. */
349 LONGEST implicit_const;
351 std::vector<attr> attr_vec;
354 std::unordered_map<ULONGEST, index_val> abbrev_map;
356 const char *namei_to_name (uint32_t namei) const;
358 /* Implementation of the mapped_index_base virtual interface, for
359 the name_components cache. */
361 const char *symbol_name_at (offset_type idx) const override
362 { return namei_to_name (idx); }
364 size_t symbol_name_count () const override
365 { return this->name_count; }
368 typedef struct dwarf2_per_cu_data *dwarf2_per_cu_ptr;
369 DEF_VEC_P (dwarf2_per_cu_ptr);
373 int nr_uniq_abbrev_tables;
375 int nr_symtab_sharers;
376 int nr_stmt_less_type_units;
377 int nr_all_type_units_reallocs;
380 /* Collection of data recorded per objfile.
381 This hangs off of dwarf2_objfile_data_key. */
383 struct dwarf2_per_objfile
385 /* Construct a dwarf2_per_objfile for OBJFILE. NAMES points to the
386 dwarf2 section names, or is NULL if the standard ELF names are
388 dwarf2_per_objfile (struct objfile *objfile,
389 const dwarf2_debug_sections *names);
391 ~dwarf2_per_objfile ();
393 DISABLE_COPY_AND_ASSIGN (dwarf2_per_objfile);
395 /* Free all cached compilation units. */
396 void free_cached_comp_units ();
398 /* This function is mapped across the sections and remembers the
399 offset and size of each of the debugging sections we are
401 void locate_sections (bfd *abfd, asection *sectp,
402 const dwarf2_debug_sections &names);
405 dwarf2_section_info info {};
406 dwarf2_section_info abbrev {};
407 dwarf2_section_info line {};
408 dwarf2_section_info loc {};
409 dwarf2_section_info loclists {};
410 dwarf2_section_info macinfo {};
411 dwarf2_section_info macro {};
412 dwarf2_section_info str {};
413 dwarf2_section_info line_str {};
414 dwarf2_section_info ranges {};
415 dwarf2_section_info rnglists {};
416 dwarf2_section_info addr {};
417 dwarf2_section_info frame {};
418 dwarf2_section_info eh_frame {};
419 dwarf2_section_info gdb_index {};
420 dwarf2_section_info debug_names {};
421 dwarf2_section_info debug_aranges {};
423 VEC (dwarf2_section_info_def) *types = NULL;
426 struct objfile *objfile = NULL;
428 /* Table of all the compilation units. This is used to locate
429 the target compilation unit of a particular reference. */
430 struct dwarf2_per_cu_data **all_comp_units = NULL;
432 /* The number of compilation units in ALL_COMP_UNITS. */
433 int n_comp_units = 0;
435 /* The number of .debug_types-related CUs. */
436 int n_type_units = 0;
438 /* The number of elements allocated in all_type_units.
439 If there are skeleton-less TUs, we add them to all_type_units lazily. */
440 int n_allocated_type_units = 0;
442 /* The .debug_types-related CUs (TUs).
443 This is stored in malloc space because we may realloc it. */
444 struct signatured_type **all_type_units = NULL;
446 /* Table of struct type_unit_group objects.
447 The hash key is the DW_AT_stmt_list value. */
448 htab_t type_unit_groups {};
450 /* A table mapping .debug_types signatures to its signatured_type entry.
451 This is NULL if the .debug_types section hasn't been read in yet. */
452 htab_t signatured_types {};
454 /* Type unit statistics, to see how well the scaling improvements
456 struct tu_stats tu_stats {};
458 /* A chain of compilation units that are currently read in, so that
459 they can be freed later. */
460 dwarf2_per_cu_data *read_in_chain = NULL;
462 /* A table mapping DW_AT_dwo_name values to struct dwo_file objects.
463 This is NULL if the table hasn't been allocated yet. */
466 /* True if we've checked for whether there is a DWP file. */
467 bool dwp_checked = false;
469 /* The DWP file if there is one, or NULL. */
470 struct dwp_file *dwp_file = NULL;
472 /* The shared '.dwz' file, if one exists. This is used when the
473 original data was compressed using 'dwz -m'. */
474 struct dwz_file *dwz_file = NULL;
476 /* A flag indicating whether this objfile has a section loaded at a
478 bool has_section_at_zero = false;
480 /* True if we are using the mapped index,
481 or we are faking it for OBJF_READNOW's sake. */
482 bool using_index = false;
484 /* The mapped index, or NULL if .gdb_index is missing or not being used. */
485 mapped_index *index_table = NULL;
487 /* The mapped index, or NULL if .debug_names is missing or not being used. */
488 std::unique_ptr<mapped_debug_names> debug_names_table;
490 /* When using index_table, this keeps track of all quick_file_names entries.
491 TUs typically share line table entries with a CU, so we maintain a
492 separate table of all line table entries to support the sharing.
493 Note that while there can be way more TUs than CUs, we've already
494 sorted all the TUs into "type unit groups", grouped by their
495 DW_AT_stmt_list value. Therefore the only sharing done here is with a
496 CU and its associated TU group if there is one. */
497 htab_t quick_file_names_table {};
499 /* Set during partial symbol reading, to prevent queueing of full
501 bool reading_partial_symbols = false;
503 /* Table mapping type DIEs to their struct type *.
504 This is NULL if not allocated yet.
505 The mapping is done via (CU/TU + DIE offset) -> type. */
506 htab_t die_type_hash {};
508 /* The CUs we recently read. */
509 VEC (dwarf2_per_cu_ptr) *just_read_cus = NULL;
511 /* Table containing line_header indexed by offset and offset_in_dwz. */
512 htab_t line_header_hash {};
514 /* Table containing all filenames. This is an optional because the
515 table is lazily constructed on first access. */
516 gdb::optional<filename_seen_cache> filenames_cache;
519 /* Get the dwarf2_per_objfile associated to OBJFILE. */
521 struct dwarf2_per_objfile *
522 get_dwarf2_per_objfile (struct objfile *objfile)
524 return ((struct dwarf2_per_objfile *)
525 objfile_data (objfile, dwarf2_objfile_data_key));
528 /* Set the dwarf2_per_objfile associated to OBJFILE. */
531 set_dwarf2_per_objfile (struct objfile *objfile,
532 struct dwarf2_per_objfile *dwarf2_per_objfile)
534 gdb_assert (get_dwarf2_per_objfile (objfile) == NULL);
535 set_objfile_data (objfile, dwarf2_objfile_data_key, dwarf2_per_objfile);
538 /* Default names of the debugging sections. */
540 /* Note that if the debugging section has been compressed, it might
541 have a name like .zdebug_info. */
543 static const struct dwarf2_debug_sections dwarf2_elf_names =
545 { ".debug_info", ".zdebug_info" },
546 { ".debug_abbrev", ".zdebug_abbrev" },
547 { ".debug_line", ".zdebug_line" },
548 { ".debug_loc", ".zdebug_loc" },
549 { ".debug_loclists", ".zdebug_loclists" },
550 { ".debug_macinfo", ".zdebug_macinfo" },
551 { ".debug_macro", ".zdebug_macro" },
552 { ".debug_str", ".zdebug_str" },
553 { ".debug_line_str", ".zdebug_line_str" },
554 { ".debug_ranges", ".zdebug_ranges" },
555 { ".debug_rnglists", ".zdebug_rnglists" },
556 { ".debug_types", ".zdebug_types" },
557 { ".debug_addr", ".zdebug_addr" },
558 { ".debug_frame", ".zdebug_frame" },
559 { ".eh_frame", NULL },
560 { ".gdb_index", ".zgdb_index" },
561 { ".debug_names", ".zdebug_names" },
562 { ".debug_aranges", ".zdebug_aranges" },
566 /* List of DWO/DWP sections. */
568 static const struct dwop_section_names
570 struct dwarf2_section_names abbrev_dwo;
571 struct dwarf2_section_names info_dwo;
572 struct dwarf2_section_names line_dwo;
573 struct dwarf2_section_names loc_dwo;
574 struct dwarf2_section_names loclists_dwo;
575 struct dwarf2_section_names macinfo_dwo;
576 struct dwarf2_section_names macro_dwo;
577 struct dwarf2_section_names str_dwo;
578 struct dwarf2_section_names str_offsets_dwo;
579 struct dwarf2_section_names types_dwo;
580 struct dwarf2_section_names cu_index;
581 struct dwarf2_section_names tu_index;
585 { ".debug_abbrev.dwo", ".zdebug_abbrev.dwo" },
586 { ".debug_info.dwo", ".zdebug_info.dwo" },
587 { ".debug_line.dwo", ".zdebug_line.dwo" },
588 { ".debug_loc.dwo", ".zdebug_loc.dwo" },
589 { ".debug_loclists.dwo", ".zdebug_loclists.dwo" },
590 { ".debug_macinfo.dwo", ".zdebug_macinfo.dwo" },
591 { ".debug_macro.dwo", ".zdebug_macro.dwo" },
592 { ".debug_str.dwo", ".zdebug_str.dwo" },
593 { ".debug_str_offsets.dwo", ".zdebug_str_offsets.dwo" },
594 { ".debug_types.dwo", ".zdebug_types.dwo" },
595 { ".debug_cu_index", ".zdebug_cu_index" },
596 { ".debug_tu_index", ".zdebug_tu_index" },
599 /* local data types */
601 /* The data in a compilation unit header, after target2host
602 translation, looks like this. */
603 struct comp_unit_head
607 unsigned char addr_size;
608 unsigned char signed_addr_p;
609 sect_offset abbrev_sect_off;
611 /* Size of file offsets; either 4 or 8. */
612 unsigned int offset_size;
614 /* Size of the length field; either 4 or 12. */
615 unsigned int initial_length_size;
617 enum dwarf_unit_type unit_type;
619 /* Offset to the first byte of this compilation unit header in the
620 .debug_info section, for resolving relative reference dies. */
621 sect_offset sect_off;
623 /* Offset to first die in this cu from the start of the cu.
624 This will be the first byte following the compilation unit header. */
625 cu_offset first_die_cu_offset;
627 /* 64-bit signature of this type unit - it is valid only for
628 UNIT_TYPE DW_UT_type. */
631 /* For types, offset in the type's DIE of the type defined by this TU. */
632 cu_offset type_cu_offset_in_tu;
635 /* Type used for delaying computation of method physnames.
636 See comments for compute_delayed_physnames. */
637 struct delayed_method_info
639 /* The type to which the method is attached, i.e., its parent class. */
642 /* The index of the method in the type's function fieldlists. */
645 /* The index of the method in the fieldlist. */
648 /* The name of the DIE. */
651 /* The DIE associated with this method. */
652 struct die_info *die;
655 /* Internal state when decoding a particular compilation unit. */
658 explicit dwarf2_cu (struct dwarf2_per_cu_data *per_cu);
661 DISABLE_COPY_AND_ASSIGN (dwarf2_cu);
663 /* The header of the compilation unit. */
664 struct comp_unit_head header {};
666 /* Base address of this compilation unit. */
667 CORE_ADDR base_address = 0;
669 /* Non-zero if base_address has been set. */
672 /* The language we are debugging. */
673 enum language language = language_unknown;
674 const struct language_defn *language_defn = nullptr;
676 const char *producer = nullptr;
678 /* The generic symbol table building routines have separate lists for
679 file scope symbols and all all other scopes (local scopes). So
680 we need to select the right one to pass to add_symbol_to_list().
681 We do it by keeping a pointer to the correct list in list_in_scope.
683 FIXME: The original dwarf code just treated the file scope as the
684 first local scope, and all other local scopes as nested local
685 scopes, and worked fine. Check to see if we really need to
686 distinguish these in buildsym.c. */
687 struct pending **list_in_scope = nullptr;
689 /* Hash table holding all the loaded partial DIEs
690 with partial_die->offset.SECT_OFF as hash. */
691 htab_t partial_dies = nullptr;
693 /* Storage for things with the same lifetime as this read-in compilation
694 unit, including partial DIEs. */
695 auto_obstack comp_unit_obstack;
697 /* When multiple dwarf2_cu structures are living in memory, this field
698 chains them all together, so that they can be released efficiently.
699 We will probably also want a generation counter so that most-recently-used
700 compilation units are cached... */
701 struct dwarf2_per_cu_data *read_in_chain = nullptr;
703 /* Backlink to our per_cu entry. */
704 struct dwarf2_per_cu_data *per_cu;
706 /* How many compilation units ago was this CU last referenced? */
709 /* A hash table of DIE cu_offset for following references with
710 die_info->offset.sect_off as hash. */
711 htab_t die_hash = nullptr;
713 /* Full DIEs if read in. */
714 struct die_info *dies = nullptr;
716 /* A set of pointers to dwarf2_per_cu_data objects for compilation
717 units referenced by this one. Only set during full symbol processing;
718 partial symbol tables do not have dependencies. */
719 htab_t dependencies = nullptr;
721 /* Header data from the line table, during full symbol processing. */
722 struct line_header *line_header = nullptr;
723 /* Non-NULL if LINE_HEADER is owned by this DWARF_CU. Otherwise,
724 it's owned by dwarf2_per_objfile::line_header_hash. If non-NULL,
725 this is the DW_TAG_compile_unit die for this CU. We'll hold on
726 to the line header as long as this DIE is being processed. See
727 process_die_scope. */
728 die_info *line_header_die_owner = nullptr;
730 /* A list of methods which need to have physnames computed
731 after all type information has been read. */
732 std::vector<delayed_method_info> method_list;
734 /* To be copied to symtab->call_site_htab. */
735 htab_t call_site_htab = nullptr;
737 /* Non-NULL if this CU came from a DWO file.
738 There is an invariant here that is important to remember:
739 Except for attributes copied from the top level DIE in the "main"
740 (or "stub") file in preparation for reading the DWO file
741 (e.g., DW_AT_GNU_addr_base), we KISS: there is only *one* CU.
742 Either there isn't a DWO file (in which case this is NULL and the point
743 is moot), or there is and either we're not going to read it (in which
744 case this is NULL) or there is and we are reading it (in which case this
746 struct dwo_unit *dwo_unit = nullptr;
748 /* The DW_AT_addr_base attribute if present, zero otherwise
749 (zero is a valid value though).
750 Note this value comes from the Fission stub CU/TU's DIE. */
751 ULONGEST addr_base = 0;
753 /* The DW_AT_ranges_base attribute if present, zero otherwise
754 (zero is a valid value though).
755 Note this value comes from the Fission stub CU/TU's DIE.
756 Also note that the value is zero in the non-DWO case so this value can
757 be used without needing to know whether DWO files are in use or not.
758 N.B. This does not apply to DW_AT_ranges appearing in
759 DW_TAG_compile_unit dies. This is a bit of a wart, consider if ever
760 DW_AT_ranges appeared in the DW_TAG_compile_unit of DWO DIEs: then
761 DW_AT_ranges_base *would* have to be applied, and we'd have to care
762 whether the DW_AT_ranges attribute came from the skeleton or DWO. */
763 ULONGEST ranges_base = 0;
765 /* Mark used when releasing cached dies. */
766 unsigned int mark : 1;
768 /* This CU references .debug_loc. See the symtab->locations_valid field.
769 This test is imperfect as there may exist optimized debug code not using
770 any location list and still facing inlining issues if handled as
771 unoptimized code. For a future better test see GCC PR other/32998. */
772 unsigned int has_loclist : 1;
774 /* These cache the results for producer_is_* fields. CHECKED_PRODUCER is set
775 if all the producer_is_* fields are valid. This information is cached
776 because profiling CU expansion showed excessive time spent in
777 producer_is_gxx_lt_4_6. */
778 unsigned int checked_producer : 1;
779 unsigned int producer_is_gxx_lt_4_6 : 1;
780 unsigned int producer_is_gcc_lt_4_3 : 1;
781 unsigned int producer_is_icc_lt_14 : 1;
783 /* When set, the file that we're processing is known to have
784 debugging info for C++ namespaces. GCC 3.3.x did not produce
785 this information, but later versions do. */
787 unsigned int processing_has_namespace_info : 1;
790 /* Persistent data held for a compilation unit, even when not
791 processing it. We put a pointer to this structure in the
792 read_symtab_private field of the psymtab. */
794 struct dwarf2_per_cu_data
796 /* The start offset and length of this compilation unit.
797 NOTE: Unlike comp_unit_head.length, this length includes
799 If the DIE refers to a DWO file, this is always of the original die,
801 sect_offset sect_off;
804 /* DWARF standard version this data has been read from (such as 4 or 5). */
807 /* Flag indicating this compilation unit will be read in before
808 any of the current compilation units are processed. */
809 unsigned int queued : 1;
811 /* This flag will be set when reading partial DIEs if we need to load
812 absolutely all DIEs for this compilation unit, instead of just the ones
813 we think are interesting. It gets set if we look for a DIE in the
814 hash table and don't find it. */
815 unsigned int load_all_dies : 1;
817 /* Non-zero if this CU is from .debug_types.
818 Struct dwarf2_per_cu_data is contained in struct signatured_type iff
820 unsigned int is_debug_types : 1;
822 /* Non-zero if this CU is from the .dwz file. */
823 unsigned int is_dwz : 1;
825 /* Non-zero if reading a TU directly from a DWO file, bypassing the stub.
826 This flag is only valid if is_debug_types is true.
827 We can't read a CU directly from a DWO file: There are required
828 attributes in the stub. */
829 unsigned int reading_dwo_directly : 1;
831 /* Non-zero if the TU has been read.
832 This is used to assist the "Stay in DWO Optimization" for Fission:
833 When reading a DWO, it's faster to read TUs from the DWO instead of
834 fetching them from random other DWOs (due to comdat folding).
835 If the TU has already been read, the optimization is unnecessary
836 (and unwise - we don't want to change where gdb thinks the TU lives
838 This flag is only valid if is_debug_types is true. */
839 unsigned int tu_read : 1;
841 /* The section this CU/TU lives in.
842 If the DIE refers to a DWO file, this is always the original die,
844 struct dwarf2_section_info *section;
846 /* Set to non-NULL iff this CU is currently loaded. When it gets freed out
847 of the CU cache it gets reset to NULL again. This is left as NULL for
848 dummy CUs (a CU header, but nothing else). */
849 struct dwarf2_cu *cu;
851 /* The corresponding dwarf2_per_objfile. */
852 struct dwarf2_per_objfile *dwarf2_per_objfile;
854 /* When dwarf2_per_objfile->using_index is true, the 'quick' field
855 is active. Otherwise, the 'psymtab' field is active. */
858 /* The partial symbol table associated with this compilation unit,
859 or NULL for unread partial units. */
860 struct partial_symtab *psymtab;
862 /* Data needed by the "quick" functions. */
863 struct dwarf2_per_cu_quick_data *quick;
866 /* The CUs we import using DW_TAG_imported_unit. This is filled in
867 while reading psymtabs, used to compute the psymtab dependencies,
868 and then cleared. Then it is filled in again while reading full
869 symbols, and only deleted when the objfile is destroyed.
871 This is also used to work around a difference between the way gold
872 generates .gdb_index version <=7 and the way gdb does. Arguably this
873 is a gold bug. For symbols coming from TUs, gold records in the index
874 the CU that includes the TU instead of the TU itself. This breaks
875 dw2_lookup_symbol: It assumes that if the index says symbol X lives
876 in CU/TU Y, then one need only expand Y and a subsequent lookup in Y
877 will find X. Alas TUs live in their own symtab, so after expanding CU Y
878 we need to look in TU Z to find X. Fortunately, this is akin to
879 DW_TAG_imported_unit, so we just use the same mechanism: For
880 .gdb_index version <=7 this also records the TUs that the CU referred
881 to. Concurrently with this change gdb was modified to emit version 8
882 indices so we only pay a price for gold generated indices.
883 http://sourceware.org/bugzilla/show_bug.cgi?id=15021. */
884 VEC (dwarf2_per_cu_ptr) *imported_symtabs;
887 /* Entry in the signatured_types hash table. */
889 struct signatured_type
891 /* The "per_cu" object of this type.
892 This struct is used iff per_cu.is_debug_types.
893 N.B.: This is the first member so that it's easy to convert pointers
895 struct dwarf2_per_cu_data per_cu;
897 /* The type's signature. */
900 /* Offset in the TU of the type's DIE, as read from the TU header.
901 If this TU is a DWO stub and the definition lives in a DWO file
902 (specified by DW_AT_GNU_dwo_name), this value is unusable. */
903 cu_offset type_offset_in_tu;
905 /* Offset in the section of the type's DIE.
906 If the definition lives in a DWO file, this is the offset in the
907 .debug_types.dwo section.
908 The value is zero until the actual value is known.
909 Zero is otherwise not a valid section offset. */
910 sect_offset type_offset_in_section;
912 /* Type units are grouped by their DW_AT_stmt_list entry so that they
913 can share them. This points to the containing symtab. */
914 struct type_unit_group *type_unit_group;
917 The first time we encounter this type we fully read it in and install it
918 in the symbol tables. Subsequent times we only need the type. */
921 /* Containing DWO unit.
922 This field is valid iff per_cu.reading_dwo_directly. */
923 struct dwo_unit *dwo_unit;
926 typedef struct signatured_type *sig_type_ptr;
927 DEF_VEC_P (sig_type_ptr);
929 /* A struct that can be used as a hash key for tables based on DW_AT_stmt_list.
930 This includes type_unit_group and quick_file_names. */
932 struct stmt_list_hash
934 /* The DWO unit this table is from or NULL if there is none. */
935 struct dwo_unit *dwo_unit;
937 /* Offset in .debug_line or .debug_line.dwo. */
938 sect_offset line_sect_off;
941 /* Each element of dwarf2_per_objfile->type_unit_groups is a pointer to
942 an object of this type. */
944 struct type_unit_group
946 /* dwarf2read.c's main "handle" on a TU symtab.
947 To simplify things we create an artificial CU that "includes" all the
948 type units using this stmt_list so that the rest of the code still has
949 a "per_cu" handle on the symtab.
950 This PER_CU is recognized by having no section. */
951 #define IS_TYPE_UNIT_GROUP(per_cu) ((per_cu)->section == NULL)
952 struct dwarf2_per_cu_data per_cu;
954 /* The TUs that share this DW_AT_stmt_list entry.
955 This is added to while parsing type units to build partial symtabs,
956 and is deleted afterwards and not used again. */
957 VEC (sig_type_ptr) *tus;
959 /* The compunit symtab.
960 Type units in a group needn't all be defined in the same source file,
961 so we create an essentially anonymous symtab as the compunit symtab. */
962 struct compunit_symtab *compunit_symtab;
964 /* The data used to construct the hash key. */
965 struct stmt_list_hash hash;
967 /* The number of symtabs from the line header.
968 The value here must match line_header.num_file_names. */
969 unsigned int num_symtabs;
971 /* The symbol tables for this TU (obtained from the files listed in
973 WARNING: The order of entries here must match the order of entries
974 in the line header. After the first TU using this type_unit_group, the
975 line header for the subsequent TUs is recreated from this. This is done
976 because we need to use the same symtabs for each TU using the same
977 DW_AT_stmt_list value. Also note that symtabs may be repeated here,
978 there's no guarantee the line header doesn't have duplicate entries. */
979 struct symtab **symtabs;
982 /* These sections are what may appear in a (real or virtual) DWO file. */
986 struct dwarf2_section_info abbrev;
987 struct dwarf2_section_info line;
988 struct dwarf2_section_info loc;
989 struct dwarf2_section_info loclists;
990 struct dwarf2_section_info macinfo;
991 struct dwarf2_section_info macro;
992 struct dwarf2_section_info str;
993 struct dwarf2_section_info str_offsets;
994 /* In the case of a virtual DWO file, these two are unused. */
995 struct dwarf2_section_info info;
996 VEC (dwarf2_section_info_def) *types;
999 /* CUs/TUs in DWP/DWO files. */
1003 /* Backlink to the containing struct dwo_file. */
1004 struct dwo_file *dwo_file;
1006 /* The "id" that distinguishes this CU/TU.
1007 .debug_info calls this "dwo_id", .debug_types calls this "signature".
1008 Since signatures came first, we stick with it for consistency. */
1011 /* The section this CU/TU lives in, in the DWO file. */
1012 struct dwarf2_section_info *section;
1014 /* Same as dwarf2_per_cu_data:{sect_off,length} but in the DWO section. */
1015 sect_offset sect_off;
1016 unsigned int length;
1018 /* For types, offset in the type's DIE of the type defined by this TU. */
1019 cu_offset type_offset_in_tu;
1022 /* include/dwarf2.h defines the DWP section codes.
1023 It defines a max value but it doesn't define a min value, which we
1024 use for error checking, so provide one. */
1026 enum dwp_v2_section_ids
1031 /* Data for one DWO file.
1033 This includes virtual DWO files (a virtual DWO file is a DWO file as it
1034 appears in a DWP file). DWP files don't really have DWO files per se -
1035 comdat folding of types "loses" the DWO file they came from, and from
1036 a high level view DWP files appear to contain a mass of random types.
1037 However, to maintain consistency with the non-DWP case we pretend DWP
1038 files contain virtual DWO files, and we assign each TU with one virtual
1039 DWO file (generally based on the line and abbrev section offsets -
1040 a heuristic that seems to work in practice). */
1044 /* The DW_AT_GNU_dwo_name attribute.
1045 For virtual DWO files the name is constructed from the section offsets
1046 of abbrev,line,loc,str_offsets so that we combine virtual DWO files
1047 from related CU+TUs. */
1048 const char *dwo_name;
1050 /* The DW_AT_comp_dir attribute. */
1051 const char *comp_dir;
1053 /* The bfd, when the file is open. Otherwise this is NULL.
1054 This is unused(NULL) for virtual DWO files where we use dwp_file.dbfd. */
1057 /* The sections that make up this DWO file.
1058 Remember that for virtual DWO files in DWP V2, these are virtual
1059 sections (for lack of a better name). */
1060 struct dwo_sections sections;
1062 /* The CUs in the file.
1063 Each element is a struct dwo_unit. Multiple CUs per DWO are supported as
1064 an extension to handle LLVM's Link Time Optimization output (where
1065 multiple source files may be compiled into a single object/dwo pair). */
1068 /* Table of TUs in the file.
1069 Each element is a struct dwo_unit. */
1073 /* These sections are what may appear in a DWP file. */
1077 /* These are used by both DWP version 1 and 2. */
1078 struct dwarf2_section_info str;
1079 struct dwarf2_section_info cu_index;
1080 struct dwarf2_section_info tu_index;
1082 /* These are only used by DWP version 2 files.
1083 In DWP version 1 the .debug_info.dwo, .debug_types.dwo, and other
1084 sections are referenced by section number, and are not recorded here.
1085 In DWP version 2 there is at most one copy of all these sections, each
1086 section being (effectively) comprised of the concatenation of all of the
1087 individual sections that exist in the version 1 format.
1088 To keep the code simple we treat each of these concatenated pieces as a
1089 section itself (a virtual section?). */
1090 struct dwarf2_section_info abbrev;
1091 struct dwarf2_section_info info;
1092 struct dwarf2_section_info line;
1093 struct dwarf2_section_info loc;
1094 struct dwarf2_section_info macinfo;
1095 struct dwarf2_section_info macro;
1096 struct dwarf2_section_info str_offsets;
1097 struct dwarf2_section_info types;
1100 /* These sections are what may appear in a virtual DWO file in DWP version 1.
1101 A virtual DWO file is a DWO file as it appears in a DWP file. */
1103 struct virtual_v1_dwo_sections
1105 struct dwarf2_section_info abbrev;
1106 struct dwarf2_section_info line;
1107 struct dwarf2_section_info loc;
1108 struct dwarf2_section_info macinfo;
1109 struct dwarf2_section_info macro;
1110 struct dwarf2_section_info str_offsets;
1111 /* Each DWP hash table entry records one CU or one TU.
1112 That is recorded here, and copied to dwo_unit.section. */
1113 struct dwarf2_section_info info_or_types;
1116 /* Similar to virtual_v1_dwo_sections, but for DWP version 2.
1117 In version 2, the sections of the DWO files are concatenated together
1118 and stored in one section of that name. Thus each ELF section contains
1119 several "virtual" sections. */
1121 struct virtual_v2_dwo_sections
1123 bfd_size_type abbrev_offset;
1124 bfd_size_type abbrev_size;
1126 bfd_size_type line_offset;
1127 bfd_size_type line_size;
1129 bfd_size_type loc_offset;
1130 bfd_size_type loc_size;
1132 bfd_size_type macinfo_offset;
1133 bfd_size_type macinfo_size;
1135 bfd_size_type macro_offset;
1136 bfd_size_type macro_size;
1138 bfd_size_type str_offsets_offset;
1139 bfd_size_type str_offsets_size;
1141 /* Each DWP hash table entry records one CU or one TU.
1142 That is recorded here, and copied to dwo_unit.section. */
1143 bfd_size_type info_or_types_offset;
1144 bfd_size_type info_or_types_size;
1147 /* Contents of DWP hash tables. */
1149 struct dwp_hash_table
1151 uint32_t version, nr_columns;
1152 uint32_t nr_units, nr_slots;
1153 const gdb_byte *hash_table, *unit_table;
1158 const gdb_byte *indices;
1162 /* This is indexed by column number and gives the id of the section
1164 #define MAX_NR_V2_DWO_SECTIONS \
1165 (1 /* .debug_info or .debug_types */ \
1166 + 1 /* .debug_abbrev */ \
1167 + 1 /* .debug_line */ \
1168 + 1 /* .debug_loc */ \
1169 + 1 /* .debug_str_offsets */ \
1170 + 1 /* .debug_macro or .debug_macinfo */)
1171 int section_ids[MAX_NR_V2_DWO_SECTIONS];
1172 const gdb_byte *offsets;
1173 const gdb_byte *sizes;
1178 /* Data for one DWP file. */
1182 /* Name of the file. */
1185 /* File format version. */
1191 /* Section info for this file. */
1192 struct dwp_sections sections;
1194 /* Table of CUs in the file. */
1195 const struct dwp_hash_table *cus;
1197 /* Table of TUs in the file. */
1198 const struct dwp_hash_table *tus;
1200 /* Tables of loaded CUs/TUs. Each entry is a struct dwo_unit *. */
1204 /* Table to map ELF section numbers to their sections.
1205 This is only needed for the DWP V1 file format. */
1206 unsigned int num_sections;
1207 asection **elf_sections;
1210 /* This represents a '.dwz' file. */
1214 /* A dwz file can only contain a few sections. */
1215 struct dwarf2_section_info abbrev;
1216 struct dwarf2_section_info info;
1217 struct dwarf2_section_info str;
1218 struct dwarf2_section_info line;
1219 struct dwarf2_section_info macro;
1220 struct dwarf2_section_info gdb_index;
1221 struct dwarf2_section_info debug_names;
1223 /* The dwz's BFD. */
1227 /* Struct used to pass misc. parameters to read_die_and_children, et
1228 al. which are used for both .debug_info and .debug_types dies.
1229 All parameters here are unchanging for the life of the call. This
1230 struct exists to abstract away the constant parameters of die reading. */
1232 struct die_reader_specs
1234 /* The bfd of die_section. */
1237 /* The CU of the DIE we are parsing. */
1238 struct dwarf2_cu *cu;
1240 /* Non-NULL if reading a DWO file (including one packaged into a DWP). */
1241 struct dwo_file *dwo_file;
1243 /* The section the die comes from.
1244 This is either .debug_info or .debug_types, or the .dwo variants. */
1245 struct dwarf2_section_info *die_section;
1247 /* die_section->buffer. */
1248 const gdb_byte *buffer;
1250 /* The end of the buffer. */
1251 const gdb_byte *buffer_end;
1253 /* The value of the DW_AT_comp_dir attribute. */
1254 const char *comp_dir;
1256 /* The abbreviation table to use when reading the DIEs. */
1257 struct abbrev_table *abbrev_table;
1260 /* Type of function passed to init_cutu_and_read_dies, et.al. */
1261 typedef void (die_reader_func_ftype) (const struct die_reader_specs *reader,
1262 const gdb_byte *info_ptr,
1263 struct die_info *comp_unit_die,
1267 /* A 1-based directory index. This is a strong typedef to prevent
1268 accidentally using a directory index as a 0-based index into an
1270 enum class dir_index : unsigned int {};
1272 /* Likewise, a 1-based file name index. */
1273 enum class file_name_index : unsigned int {};
1277 file_entry () = default;
1279 file_entry (const char *name_, dir_index d_index_,
1280 unsigned int mod_time_, unsigned int length_)
1283 mod_time (mod_time_),
1287 /* Return the include directory at D_INDEX stored in LH. Returns
1288 NULL if D_INDEX is out of bounds. */
1289 const char *include_dir (const line_header *lh) const;
1291 /* The file name. Note this is an observing pointer. The memory is
1292 owned by debug_line_buffer. */
1293 const char *name {};
1295 /* The directory index (1-based). */
1296 dir_index d_index {};
1298 unsigned int mod_time {};
1300 unsigned int length {};
1302 /* True if referenced by the Line Number Program. */
1305 /* The associated symbol table, if any. */
1306 struct symtab *symtab {};
1309 /* The line number information for a compilation unit (found in the
1310 .debug_line section) begins with a "statement program header",
1311 which contains the following information. */
1318 /* Add an entry to the include directory table. */
1319 void add_include_dir (const char *include_dir);
1321 /* Add an entry to the file name table. */
1322 void add_file_name (const char *name, dir_index d_index,
1323 unsigned int mod_time, unsigned int length);
1325 /* Return the include dir at INDEX (1-based). Returns NULL if INDEX
1326 is out of bounds. */
1327 const char *include_dir_at (dir_index index) const
1329 /* Convert directory index number (1-based) to vector index
1331 size_t vec_index = to_underlying (index) - 1;
1333 if (vec_index >= include_dirs.size ())
1335 return include_dirs[vec_index];
1338 /* Return the file name at INDEX (1-based). Returns NULL if INDEX
1339 is out of bounds. */
1340 file_entry *file_name_at (file_name_index index)
1342 /* Convert file name index number (1-based) to vector index
1344 size_t vec_index = to_underlying (index) - 1;
1346 if (vec_index >= file_names.size ())
1348 return &file_names[vec_index];
1351 /* Const version of the above. */
1352 const file_entry *file_name_at (unsigned int index) const
1354 if (index >= file_names.size ())
1356 return &file_names[index];
1359 /* Offset of line number information in .debug_line section. */
1360 sect_offset sect_off {};
1362 /* OFFSET is for struct dwz_file associated with dwarf2_per_objfile. */
1363 unsigned offset_in_dwz : 1; /* Can't initialize bitfields in-class. */
1365 unsigned int total_length {};
1366 unsigned short version {};
1367 unsigned int header_length {};
1368 unsigned char minimum_instruction_length {};
1369 unsigned char maximum_ops_per_instruction {};
1370 unsigned char default_is_stmt {};
1372 unsigned char line_range {};
1373 unsigned char opcode_base {};
1375 /* standard_opcode_lengths[i] is the number of operands for the
1376 standard opcode whose value is i. This means that
1377 standard_opcode_lengths[0] is unused, and the last meaningful
1378 element is standard_opcode_lengths[opcode_base - 1]. */
1379 std::unique_ptr<unsigned char[]> standard_opcode_lengths;
1381 /* The include_directories table. Note these are observing
1382 pointers. The memory is owned by debug_line_buffer. */
1383 std::vector<const char *> include_dirs;
1385 /* The file_names table. */
1386 std::vector<file_entry> file_names;
1388 /* The start and end of the statement program following this
1389 header. These point into dwarf2_per_objfile->line_buffer. */
1390 const gdb_byte *statement_program_start {}, *statement_program_end {};
1393 typedef std::unique_ptr<line_header> line_header_up;
1396 file_entry::include_dir (const line_header *lh) const
1398 return lh->include_dir_at (d_index);
1401 /* When we construct a partial symbol table entry we only
1402 need this much information. */
1403 struct partial_die_info
1405 /* Offset of this DIE. */
1406 sect_offset sect_off;
1408 /* DWARF-2 tag for this DIE. */
1409 ENUM_BITFIELD(dwarf_tag) tag : 16;
1411 /* Assorted flags describing the data found in this DIE. */
1412 unsigned int has_children : 1;
1413 unsigned int is_external : 1;
1414 unsigned int is_declaration : 1;
1415 unsigned int has_type : 1;
1416 unsigned int has_specification : 1;
1417 unsigned int has_pc_info : 1;
1418 unsigned int may_be_inlined : 1;
1420 /* This DIE has been marked DW_AT_main_subprogram. */
1421 unsigned int main_subprogram : 1;
1423 /* Flag set if the SCOPE field of this structure has been
1425 unsigned int scope_set : 1;
1427 /* Flag set if the DIE has a byte_size attribute. */
1428 unsigned int has_byte_size : 1;
1430 /* Flag set if the DIE has a DW_AT_const_value attribute. */
1431 unsigned int has_const_value : 1;
1433 /* Flag set if any of the DIE's children are template arguments. */
1434 unsigned int has_template_arguments : 1;
1436 /* Flag set if fixup_partial_die has been called on this die. */
1437 unsigned int fixup_called : 1;
1439 /* Flag set if DW_TAG_imported_unit uses DW_FORM_GNU_ref_alt. */
1440 unsigned int is_dwz : 1;
1442 /* Flag set if spec_offset uses DW_FORM_GNU_ref_alt. */
1443 unsigned int spec_is_dwz : 1;
1445 /* The name of this DIE. Normally the value of DW_AT_name, but
1446 sometimes a default name for unnamed DIEs. */
1449 /* The linkage name, if present. */
1450 const char *linkage_name;
1452 /* The scope to prepend to our children. This is generally
1453 allocated on the comp_unit_obstack, so will disappear
1454 when this compilation unit leaves the cache. */
1457 /* Some data associated with the partial DIE. The tag determines
1458 which field is live. */
1461 /* The location description associated with this DIE, if any. */
1462 struct dwarf_block *locdesc;
1463 /* The offset of an import, for DW_TAG_imported_unit. */
1464 sect_offset sect_off;
1467 /* If HAS_PC_INFO, the PC range associated with this DIE. */
1471 /* Pointer into the info_buffer (or types_buffer) pointing at the target of
1472 DW_AT_sibling, if any. */
1473 /* NOTE: This member isn't strictly necessary, read_partial_die could
1474 return DW_AT_sibling values to its caller load_partial_dies. */
1475 const gdb_byte *sibling;
1477 /* If HAS_SPECIFICATION, the offset of the DIE referred to by
1478 DW_AT_specification (or DW_AT_abstract_origin or
1479 DW_AT_extension). */
1480 sect_offset spec_offset;
1482 /* Pointers to this DIE's parent, first child, and next sibling,
1484 struct partial_die_info *die_parent, *die_child, *die_sibling;
1487 /* This data structure holds the information of an abbrev. */
1490 unsigned int number; /* number identifying abbrev */
1491 enum dwarf_tag tag; /* dwarf tag */
1492 unsigned short has_children; /* boolean */
1493 unsigned short num_attrs; /* number of attributes */
1494 struct attr_abbrev *attrs; /* an array of attribute descriptions */
1495 struct abbrev_info *next; /* next in chain */
1500 ENUM_BITFIELD(dwarf_attribute) name : 16;
1501 ENUM_BITFIELD(dwarf_form) form : 16;
1503 /* It is valid only if FORM is DW_FORM_implicit_const. */
1504 LONGEST implicit_const;
1507 /* Size of abbrev_table.abbrev_hash_table. */
1508 #define ABBREV_HASH_SIZE 121
1510 /* Top level data structure to contain an abbreviation table. */
1514 explicit abbrev_table (sect_offset off)
1518 XOBNEWVEC (&abbrev_obstack, struct abbrev_info *, ABBREV_HASH_SIZE);
1519 memset (m_abbrevs, 0, ABBREV_HASH_SIZE * sizeof (struct abbrev_info *));
1522 DISABLE_COPY_AND_ASSIGN (abbrev_table);
1524 /* Allocate space for a struct abbrev_info object in
1526 struct abbrev_info *alloc_abbrev ();
1528 /* Add an abbreviation to the table. */
1529 void add_abbrev (unsigned int abbrev_number, struct abbrev_info *abbrev);
1531 /* Look up an abbrev in the table.
1532 Returns NULL if the abbrev is not found. */
1534 struct abbrev_info *lookup_abbrev (unsigned int abbrev_number);
1537 /* Where the abbrev table came from.
1538 This is used as a sanity check when the table is used. */
1539 const sect_offset sect_off;
1541 /* Storage for the abbrev table. */
1542 auto_obstack abbrev_obstack;
1546 /* Hash table of abbrevs.
1547 This is an array of size ABBREV_HASH_SIZE allocated in abbrev_obstack.
1548 It could be statically allocated, but the previous code didn't so we
1550 struct abbrev_info **m_abbrevs;
1553 typedef std::unique_ptr<struct abbrev_table> abbrev_table_up;
1555 /* Attributes have a name and a value. */
1558 ENUM_BITFIELD(dwarf_attribute) name : 16;
1559 ENUM_BITFIELD(dwarf_form) form : 15;
1561 /* Has DW_STRING already been updated by dwarf2_canonicalize_name? This
1562 field should be in u.str (existing only for DW_STRING) but it is kept
1563 here for better struct attribute alignment. */
1564 unsigned int string_is_canonical : 1;
1569 struct dwarf_block *blk;
1578 /* This data structure holds a complete die structure. */
1581 /* DWARF-2 tag for this DIE. */
1582 ENUM_BITFIELD(dwarf_tag) tag : 16;
1584 /* Number of attributes */
1585 unsigned char num_attrs;
1587 /* True if we're presently building the full type name for the
1588 type derived from this DIE. */
1589 unsigned char building_fullname : 1;
1591 /* True if this die is in process. PR 16581. */
1592 unsigned char in_process : 1;
1595 unsigned int abbrev;
1597 /* Offset in .debug_info or .debug_types section. */
1598 sect_offset sect_off;
1600 /* The dies in a compilation unit form an n-ary tree. PARENT
1601 points to this die's parent; CHILD points to the first child of
1602 this node; and all the children of a given node are chained
1603 together via their SIBLING fields. */
1604 struct die_info *child; /* Its first child, if any. */
1605 struct die_info *sibling; /* Its next sibling, if any. */
1606 struct die_info *parent; /* Its parent, if any. */
1608 /* An array of attributes, with NUM_ATTRS elements. There may be
1609 zero, but it's not common and zero-sized arrays are not
1610 sufficiently portable C. */
1611 struct attribute attrs[1];
1614 /* Get at parts of an attribute structure. */
1616 #define DW_STRING(attr) ((attr)->u.str)
1617 #define DW_STRING_IS_CANONICAL(attr) ((attr)->string_is_canonical)
1618 #define DW_UNSND(attr) ((attr)->u.unsnd)
1619 #define DW_BLOCK(attr) ((attr)->u.blk)
1620 #define DW_SND(attr) ((attr)->u.snd)
1621 #define DW_ADDR(attr) ((attr)->u.addr)
1622 #define DW_SIGNATURE(attr) ((attr)->u.signature)
1624 /* Blocks are a bunch of untyped bytes. */
1629 /* Valid only if SIZE is not zero. */
1630 const gdb_byte *data;
1633 #ifndef ATTR_ALLOC_CHUNK
1634 #define ATTR_ALLOC_CHUNK 4
1637 /* Allocate fields for structs, unions and enums in this size. */
1638 #ifndef DW_FIELD_ALLOC_CHUNK
1639 #define DW_FIELD_ALLOC_CHUNK 4
1642 /* FIXME: We might want to set this from BFD via bfd_arch_bits_per_byte,
1643 but this would require a corresponding change in unpack_field_as_long
1645 static int bits_per_byte = 8;
1649 struct nextfield *next;
1657 struct nextfnfield *next;
1658 struct fn_field fnfield;
1665 struct nextfnfield *head;
1668 struct decl_field_list
1670 struct decl_field field;
1671 struct decl_field_list *next;
1674 /* The routines that read and process dies for a C struct or C++ class
1675 pass lists of data member fields and lists of member function fields
1676 in an instance of a field_info structure, as defined below. */
1679 /* List of data member and baseclasses fields. */
1680 struct nextfield *fields, *baseclasses;
1682 /* Number of fields (including baseclasses). */
1685 /* Number of baseclasses. */
1688 /* Set if the accesibility of one of the fields is not public. */
1689 int non_public_fields;
1691 /* Member function fieldlist array, contains name of possibly overloaded
1692 member function, number of overloaded member functions and a pointer
1693 to the head of the member function field chain. */
1694 struct fnfieldlist *fnfieldlists;
1696 /* Number of entries in the fnfieldlists array. */
1699 /* typedefs defined inside this class. TYPEDEF_FIELD_LIST contains head of
1700 a NULL terminated list of TYPEDEF_FIELD_LIST_COUNT elements. */
1701 struct decl_field_list *typedef_field_list;
1702 unsigned typedef_field_list_count;
1704 /* Nested types defined by this class and the number of elements in this
1706 struct decl_field_list *nested_types_list;
1707 unsigned nested_types_list_count;
1710 /* One item on the queue of compilation units to read in full symbols
1712 struct dwarf2_queue_item
1714 struct dwarf2_per_cu_data *per_cu;
1715 enum language pretend_language;
1716 struct dwarf2_queue_item *next;
1719 /* The current queue. */
1720 static struct dwarf2_queue_item *dwarf2_queue, *dwarf2_queue_tail;
1722 /* Loaded secondary compilation units are kept in memory until they
1723 have not been referenced for the processing of this many
1724 compilation units. Set this to zero to disable caching. Cache
1725 sizes of up to at least twenty will improve startup time for
1726 typical inter-CU-reference binaries, at an obvious memory cost. */
1727 static int dwarf_max_cache_age = 5;
1729 show_dwarf_max_cache_age (struct ui_file *file, int from_tty,
1730 struct cmd_list_element *c, const char *value)
1732 fprintf_filtered (file, _("The upper bound on the age of cached "
1733 "DWARF compilation units is %s.\n"),
1737 /* local function prototypes */
1739 static const char *get_section_name (const struct dwarf2_section_info *);
1741 static const char *get_section_file_name (const struct dwarf2_section_info *);
1743 static void dwarf2_find_base_address (struct die_info *die,
1744 struct dwarf2_cu *cu);
1746 static struct partial_symtab *create_partial_symtab
1747 (struct dwarf2_per_cu_data *per_cu, const char *name);
1749 static void build_type_psymtabs_reader (const struct die_reader_specs *reader,
1750 const gdb_byte *info_ptr,
1751 struct die_info *type_unit_die,
1752 int has_children, void *data);
1754 static void dwarf2_build_psymtabs_hard
1755 (struct dwarf2_per_objfile *dwarf2_per_objfile);
1757 static void scan_partial_symbols (struct partial_die_info *,
1758 CORE_ADDR *, CORE_ADDR *,
1759 int, struct dwarf2_cu *);
1761 static void add_partial_symbol (struct partial_die_info *,
1762 struct dwarf2_cu *);
1764 static void add_partial_namespace (struct partial_die_info *pdi,
1765 CORE_ADDR *lowpc, CORE_ADDR *highpc,
1766 int set_addrmap, struct dwarf2_cu *cu);
1768 static void add_partial_module (struct partial_die_info *pdi, CORE_ADDR *lowpc,
1769 CORE_ADDR *highpc, int set_addrmap,
1770 struct dwarf2_cu *cu);
1772 static void add_partial_enumeration (struct partial_die_info *enum_pdi,
1773 struct dwarf2_cu *cu);
1775 static void add_partial_subprogram (struct partial_die_info *pdi,
1776 CORE_ADDR *lowpc, CORE_ADDR *highpc,
1777 int need_pc, struct dwarf2_cu *cu);
1779 static void dwarf2_read_symtab (struct partial_symtab *,
1782 static void psymtab_to_symtab_1 (struct partial_symtab *);
1784 static abbrev_table_up abbrev_table_read_table
1785 (struct dwarf2_per_objfile *dwarf2_per_objfile, struct dwarf2_section_info *,
1788 static unsigned int peek_abbrev_code (bfd *, const gdb_byte *);
1790 static struct partial_die_info *load_partial_dies
1791 (const struct die_reader_specs *, const gdb_byte *, int);
1793 static const gdb_byte *read_partial_die (const struct die_reader_specs *,
1794 struct partial_die_info *,
1795 struct abbrev_info *,
1799 static struct partial_die_info *find_partial_die (sect_offset, int,
1800 struct dwarf2_cu *);
1802 static void fixup_partial_die (struct partial_die_info *,
1803 struct dwarf2_cu *);
1805 static const gdb_byte *read_attribute (const struct die_reader_specs *,
1806 struct attribute *, struct attr_abbrev *,
1809 static unsigned int read_1_byte (bfd *, const gdb_byte *);
1811 static int read_1_signed_byte (bfd *, const gdb_byte *);
1813 static unsigned int read_2_bytes (bfd *, const gdb_byte *);
1815 static unsigned int read_4_bytes (bfd *, const gdb_byte *);
1817 static ULONGEST read_8_bytes (bfd *, const gdb_byte *);
1819 static CORE_ADDR read_address (bfd *, const gdb_byte *ptr, struct dwarf2_cu *,
1822 static LONGEST read_initial_length (bfd *, const gdb_byte *, unsigned int *);
1824 static LONGEST read_checked_initial_length_and_offset
1825 (bfd *, const gdb_byte *, const struct comp_unit_head *,
1826 unsigned int *, unsigned int *);
1828 static LONGEST read_offset (bfd *, const gdb_byte *,
1829 const struct comp_unit_head *,
1832 static LONGEST read_offset_1 (bfd *, const gdb_byte *, unsigned int);
1834 static sect_offset read_abbrev_offset
1835 (struct dwarf2_per_objfile *dwarf2_per_objfile,
1836 struct dwarf2_section_info *, sect_offset);
1838 static const gdb_byte *read_n_bytes (bfd *, const gdb_byte *, unsigned int);
1840 static const char *read_direct_string (bfd *, const gdb_byte *, unsigned int *);
1842 static const char *read_indirect_string
1843 (struct dwarf2_per_objfile *dwarf2_per_objfile, bfd *, const gdb_byte *,
1844 const struct comp_unit_head *, unsigned int *);
1846 static const char *read_indirect_line_string
1847 (struct dwarf2_per_objfile *dwarf2_per_objfile, bfd *, const gdb_byte *,
1848 const struct comp_unit_head *, unsigned int *);
1850 static const char *read_indirect_string_at_offset
1851 (struct dwarf2_per_objfile *dwarf2_per_objfile, bfd *abfd,
1852 LONGEST str_offset);
1854 static const char *read_indirect_string_from_dwz
1855 (struct objfile *objfile, struct dwz_file *, LONGEST);
1857 static LONGEST read_signed_leb128 (bfd *, const gdb_byte *, unsigned int *);
1859 static CORE_ADDR read_addr_index_from_leb128 (struct dwarf2_cu *,
1863 static const char *read_str_index (const struct die_reader_specs *reader,
1864 ULONGEST str_index);
1866 static void set_cu_language (unsigned int, struct dwarf2_cu *);
1868 static struct attribute *dwarf2_attr (struct die_info *, unsigned int,
1869 struct dwarf2_cu *);
1871 static struct attribute *dwarf2_attr_no_follow (struct die_info *,
1874 static const char *dwarf2_string_attr (struct die_info *die, unsigned int name,
1875 struct dwarf2_cu *cu);
1877 static int dwarf2_flag_true_p (struct die_info *die, unsigned name,
1878 struct dwarf2_cu *cu);
1880 static int die_is_declaration (struct die_info *, struct dwarf2_cu *cu);
1882 static struct die_info *die_specification (struct die_info *die,
1883 struct dwarf2_cu **);
1885 static line_header_up dwarf_decode_line_header (sect_offset sect_off,
1886 struct dwarf2_cu *cu);
1888 static void dwarf_decode_lines (struct line_header *, const char *,
1889 struct dwarf2_cu *, struct partial_symtab *,
1890 CORE_ADDR, int decode_mapping);
1892 static void dwarf2_start_subfile (const char *, const char *);
1894 static struct compunit_symtab *dwarf2_start_symtab (struct dwarf2_cu *,
1895 const char *, const char *,
1898 static struct symbol *new_symbol (struct die_info *, struct type *,
1899 struct dwarf2_cu *, struct symbol * = NULL);
1901 static void dwarf2_const_value (const struct attribute *, struct symbol *,
1902 struct dwarf2_cu *);
1904 static void dwarf2_const_value_attr (const struct attribute *attr,
1907 struct obstack *obstack,
1908 struct dwarf2_cu *cu, LONGEST *value,
1909 const gdb_byte **bytes,
1910 struct dwarf2_locexpr_baton **baton);
1912 static struct type *die_type (struct die_info *, struct dwarf2_cu *);
1914 static int need_gnat_info (struct dwarf2_cu *);
1916 static struct type *die_descriptive_type (struct die_info *,
1917 struct dwarf2_cu *);
1919 static void set_descriptive_type (struct type *, struct die_info *,
1920 struct dwarf2_cu *);
1922 static struct type *die_containing_type (struct die_info *,
1923 struct dwarf2_cu *);
1925 static struct type *lookup_die_type (struct die_info *, const struct attribute *,
1926 struct dwarf2_cu *);
1928 static struct type *read_type_die (struct die_info *, struct dwarf2_cu *);
1930 static struct type *read_type_die_1 (struct die_info *, struct dwarf2_cu *);
1932 static const char *determine_prefix (struct die_info *die, struct dwarf2_cu *);
1934 static char *typename_concat (struct obstack *obs, const char *prefix,
1935 const char *suffix, int physname,
1936 struct dwarf2_cu *cu);
1938 static void read_file_scope (struct die_info *, struct dwarf2_cu *);
1940 static void read_type_unit_scope (struct die_info *, struct dwarf2_cu *);
1942 static void read_func_scope (struct die_info *, struct dwarf2_cu *);
1944 static void read_lexical_block_scope (struct die_info *, struct dwarf2_cu *);
1946 static void read_call_site_scope (struct die_info *die, struct dwarf2_cu *cu);
1948 static void read_variable (struct die_info *die, struct dwarf2_cu *cu);
1950 static int dwarf2_ranges_read (unsigned, CORE_ADDR *, CORE_ADDR *,
1951 struct dwarf2_cu *, struct partial_symtab *);
1953 /* How dwarf2_get_pc_bounds constructed its *LOWPC and *HIGHPC return
1954 values. Keep the items ordered with increasing constraints compliance. */
1957 /* No attribute DW_AT_low_pc, DW_AT_high_pc or DW_AT_ranges was found. */
1958 PC_BOUNDS_NOT_PRESENT,
1960 /* Some of the attributes DW_AT_low_pc, DW_AT_high_pc or DW_AT_ranges
1961 were present but they do not form a valid range of PC addresses. */
1964 /* Discontiguous range was found - that is DW_AT_ranges was found. */
1967 /* Contiguous range was found - DW_AT_low_pc and DW_AT_high_pc were found. */
1971 static enum pc_bounds_kind dwarf2_get_pc_bounds (struct die_info *,
1972 CORE_ADDR *, CORE_ADDR *,
1974 struct partial_symtab *);
1976 static void get_scope_pc_bounds (struct die_info *,
1977 CORE_ADDR *, CORE_ADDR *,
1978 struct dwarf2_cu *);
1980 static void dwarf2_record_block_ranges (struct die_info *, struct block *,
1981 CORE_ADDR, struct dwarf2_cu *);
1983 static void dwarf2_add_field (struct field_info *, struct die_info *,
1984 struct dwarf2_cu *);
1986 static void dwarf2_attach_fields_to_type (struct field_info *,
1987 struct type *, struct dwarf2_cu *);
1989 static void dwarf2_add_member_fn (struct field_info *,
1990 struct die_info *, struct type *,
1991 struct dwarf2_cu *);
1993 static void dwarf2_attach_fn_fields_to_type (struct field_info *,
1995 struct dwarf2_cu *);
1997 static void process_structure_scope (struct die_info *, struct dwarf2_cu *);
1999 static void read_common_block (struct die_info *, struct dwarf2_cu *);
2001 static void read_namespace (struct die_info *die, struct dwarf2_cu *);
2003 static void read_module (struct die_info *die, struct dwarf2_cu *cu);
2005 static struct using_direct **using_directives (enum language);
2007 static void read_import_statement (struct die_info *die, struct dwarf2_cu *);
2009 static int read_namespace_alias (struct die_info *die, struct dwarf2_cu *cu);
2011 static struct type *read_module_type (struct die_info *die,
2012 struct dwarf2_cu *cu);
2014 static const char *namespace_name (struct die_info *die,
2015 int *is_anonymous, struct dwarf2_cu *);
2017 static void process_enumeration_scope (struct die_info *, struct dwarf2_cu *);
2019 static CORE_ADDR decode_locdesc (struct dwarf_block *, struct dwarf2_cu *);
2021 static enum dwarf_array_dim_ordering read_array_order (struct die_info *,
2022 struct dwarf2_cu *);
2024 static struct die_info *read_die_and_siblings_1
2025 (const struct die_reader_specs *, const gdb_byte *, const gdb_byte **,
2028 static struct die_info *read_die_and_siblings (const struct die_reader_specs *,
2029 const gdb_byte *info_ptr,
2030 const gdb_byte **new_info_ptr,
2031 struct die_info *parent);
2033 static const gdb_byte *read_full_die_1 (const struct die_reader_specs *,
2034 struct die_info **, const gdb_byte *,
2037 static const gdb_byte *read_full_die (const struct die_reader_specs *,
2038 struct die_info **, const gdb_byte *,
2041 static void process_die (struct die_info *, struct dwarf2_cu *);
2043 static const char *dwarf2_canonicalize_name (const char *, struct dwarf2_cu *,
2046 static const char *dwarf2_name (struct die_info *die, struct dwarf2_cu *);
2048 static const char *dwarf2_full_name (const char *name,
2049 struct die_info *die,
2050 struct dwarf2_cu *cu);
2052 static const char *dwarf2_physname (const char *name, struct die_info *die,
2053 struct dwarf2_cu *cu);
2055 static struct die_info *dwarf2_extension (struct die_info *die,
2056 struct dwarf2_cu **);
2058 static const char *dwarf_tag_name (unsigned int);
2060 static const char *dwarf_attr_name (unsigned int);
2062 static const char *dwarf_form_name (unsigned int);
2064 static const char *dwarf_bool_name (unsigned int);
2066 static const char *dwarf_type_encoding_name (unsigned int);
2068 static struct die_info *sibling_die (struct die_info *);
2070 static void dump_die_shallow (struct ui_file *, int indent, struct die_info *);
2072 static void dump_die_for_error (struct die_info *);
2074 static void dump_die_1 (struct ui_file *, int level, int max_level,
2077 /*static*/ void dump_die (struct die_info *, int max_level);
2079 static void store_in_ref_table (struct die_info *,
2080 struct dwarf2_cu *);
2082 static sect_offset dwarf2_get_ref_die_offset (const struct attribute *);
2084 static LONGEST dwarf2_get_attr_constant_value (const struct attribute *, int);
2086 static struct die_info *follow_die_ref_or_sig (struct die_info *,
2087 const struct attribute *,
2088 struct dwarf2_cu **);
2090 static struct die_info *follow_die_ref (struct die_info *,
2091 const struct attribute *,
2092 struct dwarf2_cu **);
2094 static struct die_info *follow_die_sig (struct die_info *,
2095 const struct attribute *,
2096 struct dwarf2_cu **);
2098 static struct type *get_signatured_type (struct die_info *, ULONGEST,
2099 struct dwarf2_cu *);
2101 static struct type *get_DW_AT_signature_type (struct die_info *,
2102 const struct attribute *,
2103 struct dwarf2_cu *);
2105 static void load_full_type_unit (struct dwarf2_per_cu_data *per_cu);
2107 static void read_signatured_type (struct signatured_type *);
2109 static int attr_to_dynamic_prop (const struct attribute *attr,
2110 struct die_info *die, struct dwarf2_cu *cu,
2111 struct dynamic_prop *prop);
2113 /* memory allocation interface */
2115 static struct dwarf_block *dwarf_alloc_block (struct dwarf2_cu *);
2117 static struct die_info *dwarf_alloc_die (struct dwarf2_cu *, int);
2119 static void dwarf_decode_macros (struct dwarf2_cu *, unsigned int, int);
2121 static int attr_form_is_block (const struct attribute *);
2123 static int attr_form_is_section_offset (const struct attribute *);
2125 static int attr_form_is_constant (const struct attribute *);
2127 static int attr_form_is_ref (const struct attribute *);
2129 static void fill_in_loclist_baton (struct dwarf2_cu *cu,
2130 struct dwarf2_loclist_baton *baton,
2131 const struct attribute *attr);
2133 static void dwarf2_symbol_mark_computed (const struct attribute *attr,
2135 struct dwarf2_cu *cu,
2138 static const gdb_byte *skip_one_die (const struct die_reader_specs *reader,
2139 const gdb_byte *info_ptr,
2140 struct abbrev_info *abbrev);
2142 static hashval_t partial_die_hash (const void *item);
2144 static int partial_die_eq (const void *item_lhs, const void *item_rhs);
2146 static struct dwarf2_per_cu_data *dwarf2_find_containing_comp_unit
2147 (sect_offset sect_off, unsigned int offset_in_dwz,
2148 struct dwarf2_per_objfile *dwarf2_per_objfile);
2150 static void prepare_one_comp_unit (struct dwarf2_cu *cu,
2151 struct die_info *comp_unit_die,
2152 enum language pretend_language);
2154 static void free_cached_comp_units (void *);
2156 static void age_cached_comp_units (struct dwarf2_per_objfile *dwarf2_per_objfile);
2158 static void free_one_cached_comp_unit (struct dwarf2_per_cu_data *);
2160 static struct type *set_die_type (struct die_info *, struct type *,
2161 struct dwarf2_cu *);
2163 static void create_all_comp_units (struct dwarf2_per_objfile *dwarf2_per_objfile);
2165 static int create_all_type_units (struct dwarf2_per_objfile *dwarf2_per_objfile);
2167 static void load_full_comp_unit (struct dwarf2_per_cu_data *,
2170 static void process_full_comp_unit (struct dwarf2_per_cu_data *,
2173 static void process_full_type_unit (struct dwarf2_per_cu_data *,
2176 static void dwarf2_add_dependence (struct dwarf2_cu *,
2177 struct dwarf2_per_cu_data *);
2179 static void dwarf2_mark (struct dwarf2_cu *);
2181 static void dwarf2_clear_marks (struct dwarf2_per_cu_data *);
2183 static struct type *get_die_type_at_offset (sect_offset,
2184 struct dwarf2_per_cu_data *);
2186 static struct type *get_die_type (struct die_info *die, struct dwarf2_cu *cu);
2188 static void queue_comp_unit (struct dwarf2_per_cu_data *per_cu,
2189 enum language pretend_language);
2191 static void process_queue (struct dwarf2_per_objfile *dwarf2_per_objfile);
2193 /* Class, the destructor of which frees all allocated queue entries. This
2194 will only have work to do if an error was thrown while processing the
2195 dwarf. If no error was thrown then the queue entries should have all
2196 been processed, and freed, as we went along. */
2198 class dwarf2_queue_guard
2201 dwarf2_queue_guard () = default;
2203 /* Free any entries remaining on the queue. There should only be
2204 entries left if we hit an error while processing the dwarf. */
2205 ~dwarf2_queue_guard ()
2207 struct dwarf2_queue_item *item, *last;
2209 item = dwarf2_queue;
2212 /* Anything still marked queued is likely to be in an
2213 inconsistent state, so discard it. */
2214 if (item->per_cu->queued)
2216 if (item->per_cu->cu != NULL)
2217 free_one_cached_comp_unit (item->per_cu);
2218 item->per_cu->queued = 0;
2226 dwarf2_queue = dwarf2_queue_tail = NULL;
2230 /* The return type of find_file_and_directory. Note, the enclosed
2231 string pointers are only valid while this object is valid. */
2233 struct file_and_directory
2235 /* The filename. This is never NULL. */
2238 /* The compilation directory. NULL if not known. If we needed to
2239 compute a new string, this points to COMP_DIR_STORAGE, otherwise,
2240 points directly to the DW_AT_comp_dir string attribute owned by
2241 the obstack that owns the DIE. */
2242 const char *comp_dir;
2244 /* If we needed to build a new string for comp_dir, this is what
2245 owns the storage. */
2246 std::string comp_dir_storage;
2249 static file_and_directory find_file_and_directory (struct die_info *die,
2250 struct dwarf2_cu *cu);
2252 static char *file_full_name (int file, struct line_header *lh,
2253 const char *comp_dir);
2255 /* Expected enum dwarf_unit_type for read_comp_unit_head. */
2256 enum class rcuh_kind { COMPILE, TYPE };
2258 static const gdb_byte *read_and_check_comp_unit_head
2259 (struct dwarf2_per_objfile* dwarf2_per_objfile,
2260 struct comp_unit_head *header,
2261 struct dwarf2_section_info *section,
2262 struct dwarf2_section_info *abbrev_section, const gdb_byte *info_ptr,
2263 rcuh_kind section_kind);
2265 static void init_cutu_and_read_dies
2266 (struct dwarf2_per_cu_data *this_cu, struct abbrev_table *abbrev_table,
2267 int use_existing_cu, int keep,
2268 die_reader_func_ftype *die_reader_func, void *data);
2270 static void init_cutu_and_read_dies_simple
2271 (struct dwarf2_per_cu_data *this_cu,
2272 die_reader_func_ftype *die_reader_func, void *data);
2274 static htab_t allocate_signatured_type_table (struct objfile *objfile);
2276 static htab_t allocate_dwo_unit_table (struct objfile *objfile);
2278 static struct dwo_unit *lookup_dwo_unit_in_dwp
2279 (struct dwarf2_per_objfile *dwarf2_per_objfile,
2280 struct dwp_file *dwp_file, const char *comp_dir,
2281 ULONGEST signature, int is_debug_types);
2283 static struct dwp_file *get_dwp_file
2284 (struct dwarf2_per_objfile *dwarf2_per_objfile);
2286 static struct dwo_unit *lookup_dwo_comp_unit
2287 (struct dwarf2_per_cu_data *, const char *, const char *, ULONGEST);
2289 static struct dwo_unit *lookup_dwo_type_unit
2290 (struct signatured_type *, const char *, const char *);
2292 static void queue_and_load_all_dwo_tus (struct dwarf2_per_cu_data *);
2294 static void free_dwo_file_cleanup (void *);
2296 struct free_dwo_file_cleanup_data
2298 struct dwo_file *dwo_file;
2299 struct dwarf2_per_objfile *dwarf2_per_objfile;
2302 static void process_cu_includes (struct dwarf2_per_objfile *dwarf2_per_objfile);
2304 static void check_producer (struct dwarf2_cu *cu);
2306 static void free_line_header_voidp (void *arg);
2308 /* Various complaints about symbol reading that don't abort the process. */
2311 dwarf2_statement_list_fits_in_line_number_section_complaint (void)
2313 complaint (&symfile_complaints,
2314 _("statement list doesn't fit in .debug_line section"));
2318 dwarf2_debug_line_missing_file_complaint (void)
2320 complaint (&symfile_complaints,
2321 _(".debug_line section has line data without a file"));
2325 dwarf2_debug_line_missing_end_sequence_complaint (void)
2327 complaint (&symfile_complaints,
2328 _(".debug_line section has line "
2329 "program sequence without an end"));
2333 dwarf2_complex_location_expr_complaint (void)
2335 complaint (&symfile_complaints, _("location expression too complex"));
2339 dwarf2_const_value_length_mismatch_complaint (const char *arg1, int arg2,
2342 complaint (&symfile_complaints,
2343 _("const value length mismatch for '%s', got %d, expected %d"),
2348 dwarf2_section_buffer_overflow_complaint (struct dwarf2_section_info *section)
2350 complaint (&symfile_complaints,
2351 _("debug info runs off end of %s section"
2353 get_section_name (section),
2354 get_section_file_name (section));
2358 dwarf2_macro_malformed_definition_complaint (const char *arg1)
2360 complaint (&symfile_complaints,
2361 _("macro debug info contains a "
2362 "malformed macro definition:\n`%s'"),
2367 dwarf2_invalid_attrib_class_complaint (const char *arg1, const char *arg2)
2369 complaint (&symfile_complaints,
2370 _("invalid attribute class or form for '%s' in '%s'"),
2374 /* Hash function for line_header_hash. */
2377 line_header_hash (const struct line_header *ofs)
2379 return to_underlying (ofs->sect_off) ^ ofs->offset_in_dwz;
2382 /* Hash function for htab_create_alloc_ex for line_header_hash. */
2385 line_header_hash_voidp (const void *item)
2387 const struct line_header *ofs = (const struct line_header *) item;
2389 return line_header_hash (ofs);
2392 /* Equality function for line_header_hash. */
2395 line_header_eq_voidp (const void *item_lhs, const void *item_rhs)
2397 const struct line_header *ofs_lhs = (const struct line_header *) item_lhs;
2398 const struct line_header *ofs_rhs = (const struct line_header *) item_rhs;
2400 return (ofs_lhs->sect_off == ofs_rhs->sect_off
2401 && ofs_lhs->offset_in_dwz == ofs_rhs->offset_in_dwz);
2406 /* Read the given attribute value as an address, taking the attribute's
2407 form into account. */
2410 attr_value_as_address (struct attribute *attr)
2414 if (attr->form != DW_FORM_addr && attr->form != DW_FORM_GNU_addr_index)
2416 /* Aside from a few clearly defined exceptions, attributes that
2417 contain an address must always be in DW_FORM_addr form.
2418 Unfortunately, some compilers happen to be violating this
2419 requirement by encoding addresses using other forms, such
2420 as DW_FORM_data4 for example. For those broken compilers,
2421 we try to do our best, without any guarantee of success,
2422 to interpret the address correctly. It would also be nice
2423 to generate a complaint, but that would require us to maintain
2424 a list of legitimate cases where a non-address form is allowed,
2425 as well as update callers to pass in at least the CU's DWARF
2426 version. This is more overhead than what we're willing to
2427 expand for a pretty rare case. */
2428 addr = DW_UNSND (attr);
2431 addr = DW_ADDR (attr);
2436 /* The suffix for an index file. */
2437 #define INDEX4_SUFFIX ".gdb-index"
2438 #define INDEX5_SUFFIX ".debug_names"
2439 #define DEBUG_STR_SUFFIX ".debug_str"
2441 /* See declaration. */
2443 dwarf2_per_objfile::dwarf2_per_objfile (struct objfile *objfile_,
2444 const dwarf2_debug_sections *names)
2445 : objfile (objfile_)
2448 names = &dwarf2_elf_names;
2450 bfd *obfd = objfile->obfd;
2452 for (asection *sec = obfd->sections; sec != NULL; sec = sec->next)
2453 locate_sections (obfd, sec, *names);
2456 static void free_dwo_files (htab_t dwo_files, struct objfile *objfile);
2458 dwarf2_per_objfile::~dwarf2_per_objfile ()
2460 /* Cached DIE trees use xmalloc and the comp_unit_obstack. */
2461 free_cached_comp_units ();
2463 if (quick_file_names_table)
2464 htab_delete (quick_file_names_table);
2466 if (line_header_hash)
2467 htab_delete (line_header_hash);
2469 for (int ix = 0; ix < n_comp_units; ++ix)
2470 VEC_free (dwarf2_per_cu_ptr, all_comp_units[ix]->imported_symtabs);
2472 for (int ix = 0; ix < n_type_units; ++ix)
2473 VEC_free (dwarf2_per_cu_ptr,
2474 all_type_units[ix]->per_cu.imported_symtabs);
2475 xfree (all_type_units);
2477 VEC_free (dwarf2_section_info_def, types);
2479 if (dwo_files != NULL)
2480 free_dwo_files (dwo_files, objfile);
2481 if (dwp_file != NULL)
2482 gdb_bfd_unref (dwp_file->dbfd);
2484 if (dwz_file != NULL && dwz_file->dwz_bfd)
2485 gdb_bfd_unref (dwz_file->dwz_bfd);
2487 if (index_table != NULL)
2488 index_table->~mapped_index ();
2490 /* Everything else should be on the objfile obstack. */
2493 /* See declaration. */
2496 dwarf2_per_objfile::free_cached_comp_units ()
2498 dwarf2_per_cu_data *per_cu = read_in_chain;
2499 dwarf2_per_cu_data **last_chain = &read_in_chain;
2500 while (per_cu != NULL)
2502 dwarf2_per_cu_data *next_cu = per_cu->cu->read_in_chain;
2505 *last_chain = next_cu;
2510 /* Try to locate the sections we need for DWARF 2 debugging
2511 information and return true if we have enough to do something.
2512 NAMES points to the dwarf2 section names, or is NULL if the standard
2513 ELF names are used. */
2516 dwarf2_has_info (struct objfile *objfile,
2517 const struct dwarf2_debug_sections *names)
2519 if (objfile->flags & OBJF_READNEVER)
2522 struct dwarf2_per_objfile *dwarf2_per_objfile
2523 = get_dwarf2_per_objfile (objfile);
2525 if (dwarf2_per_objfile == NULL)
2527 /* Initialize per-objfile state. */
2528 struct dwarf2_per_objfile *data
2529 = XOBNEW (&objfile->objfile_obstack, struct dwarf2_per_objfile);
2531 dwarf2_per_objfile = new (data) struct dwarf2_per_objfile (objfile, names);
2532 set_dwarf2_per_objfile (objfile, dwarf2_per_objfile);
2534 return (!dwarf2_per_objfile->info.is_virtual
2535 && dwarf2_per_objfile->info.s.section != NULL
2536 && !dwarf2_per_objfile->abbrev.is_virtual
2537 && dwarf2_per_objfile->abbrev.s.section != NULL);
2540 /* Return the containing section of virtual section SECTION. */
2542 static struct dwarf2_section_info *
2543 get_containing_section (const struct dwarf2_section_info *section)
2545 gdb_assert (section->is_virtual);
2546 return section->s.containing_section;
2549 /* Return the bfd owner of SECTION. */
2552 get_section_bfd_owner (const struct dwarf2_section_info *section)
2554 if (section->is_virtual)
2556 section = get_containing_section (section);
2557 gdb_assert (!section->is_virtual);
2559 return section->s.section->owner;
2562 /* Return the bfd section of SECTION.
2563 Returns NULL if the section is not present. */
2566 get_section_bfd_section (const struct dwarf2_section_info *section)
2568 if (section->is_virtual)
2570 section = get_containing_section (section);
2571 gdb_assert (!section->is_virtual);
2573 return section->s.section;
2576 /* Return the name of SECTION. */
2579 get_section_name (const struct dwarf2_section_info *section)
2581 asection *sectp = get_section_bfd_section (section);
2583 gdb_assert (sectp != NULL);
2584 return bfd_section_name (get_section_bfd_owner (section), sectp);
2587 /* Return the name of the file SECTION is in. */
2590 get_section_file_name (const struct dwarf2_section_info *section)
2592 bfd *abfd = get_section_bfd_owner (section);
2594 return bfd_get_filename (abfd);
2597 /* Return the id of SECTION.
2598 Returns 0 if SECTION doesn't exist. */
2601 get_section_id (const struct dwarf2_section_info *section)
2603 asection *sectp = get_section_bfd_section (section);
2610 /* Return the flags of SECTION.
2611 SECTION (or containing section if this is a virtual section) must exist. */
2614 get_section_flags (const struct dwarf2_section_info *section)
2616 asection *sectp = get_section_bfd_section (section);
2618 gdb_assert (sectp != NULL);
2619 return bfd_get_section_flags (sectp->owner, sectp);
2622 /* When loading sections, we look either for uncompressed section or for
2623 compressed section names. */
2626 section_is_p (const char *section_name,
2627 const struct dwarf2_section_names *names)
2629 if (names->normal != NULL
2630 && strcmp (section_name, names->normal) == 0)
2632 if (names->compressed != NULL
2633 && strcmp (section_name, names->compressed) == 0)
2638 /* See declaration. */
2641 dwarf2_per_objfile::locate_sections (bfd *abfd, asection *sectp,
2642 const dwarf2_debug_sections &names)
2644 flagword aflag = bfd_get_section_flags (abfd, sectp);
2646 if ((aflag & SEC_HAS_CONTENTS) == 0)
2649 else if (section_is_p (sectp->name, &names.info))
2651 this->info.s.section = sectp;
2652 this->info.size = bfd_get_section_size (sectp);
2654 else if (section_is_p (sectp->name, &names.abbrev))
2656 this->abbrev.s.section = sectp;
2657 this->abbrev.size = bfd_get_section_size (sectp);
2659 else if (section_is_p (sectp->name, &names.line))
2661 this->line.s.section = sectp;
2662 this->line.size = bfd_get_section_size (sectp);
2664 else if (section_is_p (sectp->name, &names.loc))
2666 this->loc.s.section = sectp;
2667 this->loc.size = bfd_get_section_size (sectp);
2669 else if (section_is_p (sectp->name, &names.loclists))
2671 this->loclists.s.section = sectp;
2672 this->loclists.size = bfd_get_section_size (sectp);
2674 else if (section_is_p (sectp->name, &names.macinfo))
2676 this->macinfo.s.section = sectp;
2677 this->macinfo.size = bfd_get_section_size (sectp);
2679 else if (section_is_p (sectp->name, &names.macro))
2681 this->macro.s.section = sectp;
2682 this->macro.size = bfd_get_section_size (sectp);
2684 else if (section_is_p (sectp->name, &names.str))
2686 this->str.s.section = sectp;
2687 this->str.size = bfd_get_section_size (sectp);
2689 else if (section_is_p (sectp->name, &names.line_str))
2691 this->line_str.s.section = sectp;
2692 this->line_str.size = bfd_get_section_size (sectp);
2694 else if (section_is_p (sectp->name, &names.addr))
2696 this->addr.s.section = sectp;
2697 this->addr.size = bfd_get_section_size (sectp);
2699 else if (section_is_p (sectp->name, &names.frame))
2701 this->frame.s.section = sectp;
2702 this->frame.size = bfd_get_section_size (sectp);
2704 else if (section_is_p (sectp->name, &names.eh_frame))
2706 this->eh_frame.s.section = sectp;
2707 this->eh_frame.size = bfd_get_section_size (sectp);
2709 else if (section_is_p (sectp->name, &names.ranges))
2711 this->ranges.s.section = sectp;
2712 this->ranges.size = bfd_get_section_size (sectp);
2714 else if (section_is_p (sectp->name, &names.rnglists))
2716 this->rnglists.s.section = sectp;
2717 this->rnglists.size = bfd_get_section_size (sectp);
2719 else if (section_is_p (sectp->name, &names.types))
2721 struct dwarf2_section_info type_section;
2723 memset (&type_section, 0, sizeof (type_section));
2724 type_section.s.section = sectp;
2725 type_section.size = bfd_get_section_size (sectp);
2727 VEC_safe_push (dwarf2_section_info_def, this->types,
2730 else if (section_is_p (sectp->name, &names.gdb_index))
2732 this->gdb_index.s.section = sectp;
2733 this->gdb_index.size = bfd_get_section_size (sectp);
2735 else if (section_is_p (sectp->name, &names.debug_names))
2737 this->debug_names.s.section = sectp;
2738 this->debug_names.size = bfd_get_section_size (sectp);
2740 else if (section_is_p (sectp->name, &names.debug_aranges))
2742 this->debug_aranges.s.section = sectp;
2743 this->debug_aranges.size = bfd_get_section_size (sectp);
2746 if ((bfd_get_section_flags (abfd, sectp) & (SEC_LOAD | SEC_ALLOC))
2747 && bfd_section_vma (abfd, sectp) == 0)
2748 this->has_section_at_zero = true;
2751 /* A helper function that decides whether a section is empty,
2755 dwarf2_section_empty_p (const struct dwarf2_section_info *section)
2757 if (section->is_virtual)
2758 return section->size == 0;
2759 return section->s.section == NULL || section->size == 0;
2762 /* Read the contents of the section INFO.
2763 OBJFILE is the main object file, but not necessarily the file where
2764 the section comes from. E.g., for DWO files the bfd of INFO is the bfd
2766 If the section is compressed, uncompress it before returning. */
2769 dwarf2_read_section (struct objfile *objfile, struct dwarf2_section_info *info)
2773 gdb_byte *buf, *retbuf;
2777 info->buffer = NULL;
2780 if (dwarf2_section_empty_p (info))
2783 sectp = get_section_bfd_section (info);
2785 /* If this is a virtual section we need to read in the real one first. */
2786 if (info->is_virtual)
2788 struct dwarf2_section_info *containing_section =
2789 get_containing_section (info);
2791 gdb_assert (sectp != NULL);
2792 if ((sectp->flags & SEC_RELOC) != 0)
2794 error (_("Dwarf Error: DWP format V2 with relocations is not"
2795 " supported in section %s [in module %s]"),
2796 get_section_name (info), get_section_file_name (info));
2798 dwarf2_read_section (objfile, containing_section);
2799 /* Other code should have already caught virtual sections that don't
2801 gdb_assert (info->virtual_offset + info->size
2802 <= containing_section->size);
2803 /* If the real section is empty or there was a problem reading the
2804 section we shouldn't get here. */
2805 gdb_assert (containing_section->buffer != NULL);
2806 info->buffer = containing_section->buffer + info->virtual_offset;
2810 /* If the section has relocations, we must read it ourselves.
2811 Otherwise we attach it to the BFD. */
2812 if ((sectp->flags & SEC_RELOC) == 0)
2814 info->buffer = gdb_bfd_map_section (sectp, &info->size);
2818 buf = (gdb_byte *) obstack_alloc (&objfile->objfile_obstack, info->size);
2821 /* When debugging .o files, we may need to apply relocations; see
2822 http://sourceware.org/ml/gdb-patches/2002-04/msg00136.html .
2823 We never compress sections in .o files, so we only need to
2824 try this when the section is not compressed. */
2825 retbuf = symfile_relocate_debug_section (objfile, sectp, buf);
2828 info->buffer = retbuf;
2832 abfd = get_section_bfd_owner (info);
2833 gdb_assert (abfd != NULL);
2835 if (bfd_seek (abfd, sectp->filepos, SEEK_SET) != 0
2836 || bfd_bread (buf, info->size, abfd) != info->size)
2838 error (_("Dwarf Error: Can't read DWARF data"
2839 " in section %s [in module %s]"),
2840 bfd_section_name (abfd, sectp), bfd_get_filename (abfd));
2844 /* A helper function that returns the size of a section in a safe way.
2845 If you are positive that the section has been read before using the
2846 size, then it is safe to refer to the dwarf2_section_info object's
2847 "size" field directly. In other cases, you must call this
2848 function, because for compressed sections the size field is not set
2849 correctly until the section has been read. */
2851 static bfd_size_type
2852 dwarf2_section_size (struct objfile *objfile,
2853 struct dwarf2_section_info *info)
2856 dwarf2_read_section (objfile, info);
2860 /* Fill in SECTP, BUFP and SIZEP with section info, given OBJFILE and
2864 dwarf2_get_section_info (struct objfile *objfile,
2865 enum dwarf2_section_enum sect,
2866 asection **sectp, const gdb_byte **bufp,
2867 bfd_size_type *sizep)
2869 struct dwarf2_per_objfile *data
2870 = (struct dwarf2_per_objfile *) objfile_data (objfile,
2871 dwarf2_objfile_data_key);
2872 struct dwarf2_section_info *info;
2874 /* We may see an objfile without any DWARF, in which case we just
2885 case DWARF2_DEBUG_FRAME:
2886 info = &data->frame;
2888 case DWARF2_EH_FRAME:
2889 info = &data->eh_frame;
2892 gdb_assert_not_reached ("unexpected section");
2895 dwarf2_read_section (objfile, info);
2897 *sectp = get_section_bfd_section (info);
2898 *bufp = info->buffer;
2899 *sizep = info->size;
2902 /* A helper function to find the sections for a .dwz file. */
2905 locate_dwz_sections (bfd *abfd, asection *sectp, void *arg)
2907 struct dwz_file *dwz_file = (struct dwz_file *) arg;
2909 /* Note that we only support the standard ELF names, because .dwz
2910 is ELF-only (at the time of writing). */
2911 if (section_is_p (sectp->name, &dwarf2_elf_names.abbrev))
2913 dwz_file->abbrev.s.section = sectp;
2914 dwz_file->abbrev.size = bfd_get_section_size (sectp);
2916 else if (section_is_p (sectp->name, &dwarf2_elf_names.info))
2918 dwz_file->info.s.section = sectp;
2919 dwz_file->info.size = bfd_get_section_size (sectp);
2921 else if (section_is_p (sectp->name, &dwarf2_elf_names.str))
2923 dwz_file->str.s.section = sectp;
2924 dwz_file->str.size = bfd_get_section_size (sectp);
2926 else if (section_is_p (sectp->name, &dwarf2_elf_names.line))
2928 dwz_file->line.s.section = sectp;
2929 dwz_file->line.size = bfd_get_section_size (sectp);
2931 else if (section_is_p (sectp->name, &dwarf2_elf_names.macro))
2933 dwz_file->macro.s.section = sectp;
2934 dwz_file->macro.size = bfd_get_section_size (sectp);
2936 else if (section_is_p (sectp->name, &dwarf2_elf_names.gdb_index))
2938 dwz_file->gdb_index.s.section = sectp;
2939 dwz_file->gdb_index.size = bfd_get_section_size (sectp);
2941 else if (section_is_p (sectp->name, &dwarf2_elf_names.debug_names))
2943 dwz_file->debug_names.s.section = sectp;
2944 dwz_file->debug_names.size = bfd_get_section_size (sectp);
2948 /* Open the separate '.dwz' debug file, if needed. Return NULL if
2949 there is no .gnu_debugaltlink section in the file. Error if there
2950 is such a section but the file cannot be found. */
2952 static struct dwz_file *
2953 dwarf2_get_dwz_file (struct dwarf2_per_objfile *dwarf2_per_objfile)
2955 const char *filename;
2956 struct dwz_file *result;
2957 bfd_size_type buildid_len_arg;
2961 if (dwarf2_per_objfile->dwz_file != NULL)
2962 return dwarf2_per_objfile->dwz_file;
2964 bfd_set_error (bfd_error_no_error);
2965 gdb::unique_xmalloc_ptr<char> data
2966 (bfd_get_alt_debug_link_info (dwarf2_per_objfile->objfile->obfd,
2967 &buildid_len_arg, &buildid));
2970 if (bfd_get_error () == bfd_error_no_error)
2972 error (_("could not read '.gnu_debugaltlink' section: %s"),
2973 bfd_errmsg (bfd_get_error ()));
2976 gdb::unique_xmalloc_ptr<bfd_byte> buildid_holder (buildid);
2978 buildid_len = (size_t) buildid_len_arg;
2980 filename = data.get ();
2982 std::string abs_storage;
2983 if (!IS_ABSOLUTE_PATH (filename))
2985 gdb::unique_xmalloc_ptr<char> abs
2986 = gdb_realpath (objfile_name (dwarf2_per_objfile->objfile));
2988 abs_storage = ldirname (abs.get ()) + SLASH_STRING + filename;
2989 filename = abs_storage.c_str ();
2992 /* First try the file name given in the section. If that doesn't
2993 work, try to use the build-id instead. */
2994 gdb_bfd_ref_ptr dwz_bfd (gdb_bfd_open (filename, gnutarget, -1));
2995 if (dwz_bfd != NULL)
2997 if (!build_id_verify (dwz_bfd.get (), buildid_len, buildid))
3001 if (dwz_bfd == NULL)
3002 dwz_bfd = build_id_to_debug_bfd (buildid_len, buildid);
3004 if (dwz_bfd == NULL)
3005 error (_("could not find '.gnu_debugaltlink' file for %s"),
3006 objfile_name (dwarf2_per_objfile->objfile));
3008 result = OBSTACK_ZALLOC (&dwarf2_per_objfile->objfile->objfile_obstack,
3010 result->dwz_bfd = dwz_bfd.release ();
3012 bfd_map_over_sections (result->dwz_bfd, locate_dwz_sections, result);
3014 gdb_bfd_record_inclusion (dwarf2_per_objfile->objfile->obfd, result->dwz_bfd);
3015 dwarf2_per_objfile->dwz_file = result;
3019 /* DWARF quick_symbols_functions support. */
3021 /* TUs can share .debug_line entries, and there can be a lot more TUs than
3022 unique line tables, so we maintain a separate table of all .debug_line
3023 derived entries to support the sharing.
3024 All the quick functions need is the list of file names. We discard the
3025 line_header when we're done and don't need to record it here. */
3026 struct quick_file_names
3028 /* The data used to construct the hash key. */
3029 struct stmt_list_hash hash;
3031 /* The number of entries in file_names, real_names. */
3032 unsigned int num_file_names;
3034 /* The file names from the line table, after being run through
3036 const char **file_names;
3038 /* The file names from the line table after being run through
3039 gdb_realpath. These are computed lazily. */
3040 const char **real_names;
3043 /* When using the index (and thus not using psymtabs), each CU has an
3044 object of this type. This is used to hold information needed by
3045 the various "quick" methods. */
3046 struct dwarf2_per_cu_quick_data
3048 /* The file table. This can be NULL if there was no file table
3049 or it's currently not read in.
3050 NOTE: This points into dwarf2_per_objfile->quick_file_names_table. */
3051 struct quick_file_names *file_names;
3053 /* The corresponding symbol table. This is NULL if symbols for this
3054 CU have not yet been read. */
3055 struct compunit_symtab *compunit_symtab;
3057 /* A temporary mark bit used when iterating over all CUs in
3058 expand_symtabs_matching. */
3059 unsigned int mark : 1;
3061 /* True if we've tried to read the file table and found there isn't one.
3062 There will be no point in trying to read it again next time. */
3063 unsigned int no_file_data : 1;
3066 /* Utility hash function for a stmt_list_hash. */
3069 hash_stmt_list_entry (const struct stmt_list_hash *stmt_list_hash)
3073 if (stmt_list_hash->dwo_unit != NULL)
3074 v += (uintptr_t) stmt_list_hash->dwo_unit->dwo_file;
3075 v += to_underlying (stmt_list_hash->line_sect_off);
3079 /* Utility equality function for a stmt_list_hash. */
3082 eq_stmt_list_entry (const struct stmt_list_hash *lhs,
3083 const struct stmt_list_hash *rhs)
3085 if ((lhs->dwo_unit != NULL) != (rhs->dwo_unit != NULL))
3087 if (lhs->dwo_unit != NULL
3088 && lhs->dwo_unit->dwo_file != rhs->dwo_unit->dwo_file)
3091 return lhs->line_sect_off == rhs->line_sect_off;
3094 /* Hash function for a quick_file_names. */
3097 hash_file_name_entry (const void *e)
3099 const struct quick_file_names *file_data
3100 = (const struct quick_file_names *) e;
3102 return hash_stmt_list_entry (&file_data->hash);
3105 /* Equality function for a quick_file_names. */
3108 eq_file_name_entry (const void *a, const void *b)
3110 const struct quick_file_names *ea = (const struct quick_file_names *) a;
3111 const struct quick_file_names *eb = (const struct quick_file_names *) b;
3113 return eq_stmt_list_entry (&ea->hash, &eb->hash);
3116 /* Delete function for a quick_file_names. */
3119 delete_file_name_entry (void *e)
3121 struct quick_file_names *file_data = (struct quick_file_names *) e;
3124 for (i = 0; i < file_data->num_file_names; ++i)
3126 xfree ((void*) file_data->file_names[i]);
3127 if (file_data->real_names)
3128 xfree ((void*) file_data->real_names[i]);
3131 /* The space for the struct itself lives on objfile_obstack,
3132 so we don't free it here. */
3135 /* Create a quick_file_names hash table. */
3138 create_quick_file_names_table (unsigned int nr_initial_entries)
3140 return htab_create_alloc (nr_initial_entries,
3141 hash_file_name_entry, eq_file_name_entry,
3142 delete_file_name_entry, xcalloc, xfree);
3145 /* Read in PER_CU->CU. This function is unrelated to symtabs, symtab would
3146 have to be created afterwards. You should call age_cached_comp_units after
3147 processing PER_CU->CU. dw2_setup must have been already called. */
3150 load_cu (struct dwarf2_per_cu_data *per_cu)
3152 if (per_cu->is_debug_types)
3153 load_full_type_unit (per_cu);
3155 load_full_comp_unit (per_cu, language_minimal);
3157 if (per_cu->cu == NULL)
3158 return; /* Dummy CU. */
3160 dwarf2_find_base_address (per_cu->cu->dies, per_cu->cu);
3163 /* Read in the symbols for PER_CU. */
3166 dw2_do_instantiate_symtab (struct dwarf2_per_cu_data *per_cu)
3168 struct dwarf2_per_objfile *dwarf2_per_objfile = per_cu->dwarf2_per_objfile;
3170 /* Skip type_unit_groups, reading the type units they contain
3171 is handled elsewhere. */
3172 if (IS_TYPE_UNIT_GROUP (per_cu))
3175 /* The destructor of dwarf2_queue_guard frees any entries left on
3176 the queue. After this point we're guaranteed to leave this function
3177 with the dwarf queue empty. */
3178 dwarf2_queue_guard q_guard;
3180 if (dwarf2_per_objfile->using_index
3181 ? per_cu->v.quick->compunit_symtab == NULL
3182 : (per_cu->v.psymtab == NULL || !per_cu->v.psymtab->readin))
3184 queue_comp_unit (per_cu, language_minimal);
3187 /* If we just loaded a CU from a DWO, and we're working with an index
3188 that may badly handle TUs, load all the TUs in that DWO as well.
3189 http://sourceware.org/bugzilla/show_bug.cgi?id=15021 */
3190 if (!per_cu->is_debug_types
3191 && per_cu->cu != NULL
3192 && per_cu->cu->dwo_unit != NULL
3193 && dwarf2_per_objfile->index_table != NULL
3194 && dwarf2_per_objfile->index_table->version <= 7
3195 /* DWP files aren't supported yet. */
3196 && get_dwp_file (dwarf2_per_objfile) == NULL)
3197 queue_and_load_all_dwo_tus (per_cu);
3200 process_queue (dwarf2_per_objfile);
3202 /* Age the cache, releasing compilation units that have not
3203 been used recently. */
3204 age_cached_comp_units (dwarf2_per_objfile);
3207 /* Ensure that the symbols for PER_CU have been read in. OBJFILE is
3208 the objfile from which this CU came. Returns the resulting symbol
3211 static struct compunit_symtab *
3212 dw2_instantiate_symtab (struct dwarf2_per_cu_data *per_cu)
3214 struct dwarf2_per_objfile *dwarf2_per_objfile = per_cu->dwarf2_per_objfile;
3216 gdb_assert (dwarf2_per_objfile->using_index);
3217 if (!per_cu->v.quick->compunit_symtab)
3219 struct cleanup *back_to = make_cleanup (free_cached_comp_units,
3220 dwarf2_per_objfile);
3221 scoped_restore decrementer = increment_reading_symtab ();
3222 dw2_do_instantiate_symtab (per_cu);
3223 process_cu_includes (dwarf2_per_objfile);
3224 do_cleanups (back_to);
3227 return per_cu->v.quick->compunit_symtab;
3230 /* Return the CU/TU given its index.
3232 This is intended for loops like:
3234 for (i = 0; i < (dwarf2_per_objfile->n_comp_units
3235 + dwarf2_per_objfile->n_type_units); ++i)
3237 struct dwarf2_per_cu_data *per_cu = dw2_get_cutu (i);
3243 static struct dwarf2_per_cu_data *
3244 dw2_get_cutu (struct dwarf2_per_objfile *dwarf2_per_objfile,
3247 if (index >= dwarf2_per_objfile->n_comp_units)
3249 index -= dwarf2_per_objfile->n_comp_units;
3250 gdb_assert (index < dwarf2_per_objfile->n_type_units);
3251 return &dwarf2_per_objfile->all_type_units[index]->per_cu;
3254 return dwarf2_per_objfile->all_comp_units[index];
3257 /* Return the CU given its index.
3258 This differs from dw2_get_cutu in that it's for when you know INDEX
3261 static struct dwarf2_per_cu_data *
3262 dw2_get_cu (struct dwarf2_per_objfile *dwarf2_per_objfile, int index)
3264 gdb_assert (index >= 0 && index < dwarf2_per_objfile->n_comp_units);
3266 return dwarf2_per_objfile->all_comp_units[index];
3269 /* Return a new dwarf2_per_cu_data allocated on OBJFILE's
3270 objfile_obstack, and constructed with the specified field
3273 static dwarf2_per_cu_data *
3274 create_cu_from_index_list (struct dwarf2_per_objfile *dwarf2_per_objfile,
3275 struct dwarf2_section_info *section,
3277 sect_offset sect_off, ULONGEST length)
3279 struct objfile *objfile = dwarf2_per_objfile->objfile;
3280 dwarf2_per_cu_data *the_cu
3281 = OBSTACK_ZALLOC (&objfile->objfile_obstack,
3282 struct dwarf2_per_cu_data);
3283 the_cu->sect_off = sect_off;
3284 the_cu->length = length;
3285 the_cu->dwarf2_per_objfile = dwarf2_per_objfile;
3286 the_cu->section = section;
3287 the_cu->v.quick = OBSTACK_ZALLOC (&objfile->objfile_obstack,
3288 struct dwarf2_per_cu_quick_data);
3289 the_cu->is_dwz = is_dwz;
3293 /* A helper for create_cus_from_index that handles a given list of
3297 create_cus_from_index_list (struct objfile *objfile,
3298 const gdb_byte *cu_list, offset_type n_elements,
3299 struct dwarf2_section_info *section,
3304 struct dwarf2_per_objfile *dwarf2_per_objfile
3305 = get_dwarf2_per_objfile (objfile);
3307 for (i = 0; i < n_elements; i += 2)
3309 gdb_static_assert (sizeof (ULONGEST) >= 8);
3311 sect_offset sect_off
3312 = (sect_offset) extract_unsigned_integer (cu_list, 8, BFD_ENDIAN_LITTLE);
3313 ULONGEST length = extract_unsigned_integer (cu_list + 8, 8, BFD_ENDIAN_LITTLE);
3316 dwarf2_per_objfile->all_comp_units[base_offset + i / 2]
3317 = create_cu_from_index_list (dwarf2_per_objfile, section, is_dwz,
3322 /* Read the CU list from the mapped index, and use it to create all
3323 the CU objects for this objfile. */
3326 create_cus_from_index (struct objfile *objfile,
3327 const gdb_byte *cu_list, offset_type cu_list_elements,
3328 const gdb_byte *dwz_list, offset_type dwz_elements)
3330 struct dwz_file *dwz;
3331 struct dwarf2_per_objfile *dwarf2_per_objfile
3332 = get_dwarf2_per_objfile (objfile);
3334 dwarf2_per_objfile->n_comp_units = (cu_list_elements + dwz_elements) / 2;
3335 dwarf2_per_objfile->all_comp_units =
3336 XOBNEWVEC (&objfile->objfile_obstack, struct dwarf2_per_cu_data *,
3337 dwarf2_per_objfile->n_comp_units);
3339 create_cus_from_index_list (objfile, cu_list, cu_list_elements,
3340 &dwarf2_per_objfile->info, 0, 0);
3342 if (dwz_elements == 0)
3345 dwz = dwarf2_get_dwz_file (dwarf2_per_objfile);
3346 create_cus_from_index_list (objfile, dwz_list, dwz_elements, &dwz->info, 1,
3347 cu_list_elements / 2);
3350 /* Create the signatured type hash table from the index. */
3353 create_signatured_type_table_from_index (struct objfile *objfile,
3354 struct dwarf2_section_info *section,
3355 const gdb_byte *bytes,
3356 offset_type elements)
3359 htab_t sig_types_hash;
3360 struct dwarf2_per_objfile *dwarf2_per_objfile
3361 = get_dwarf2_per_objfile (objfile);
3363 dwarf2_per_objfile->n_type_units
3364 = dwarf2_per_objfile->n_allocated_type_units
3366 dwarf2_per_objfile->all_type_units =
3367 XNEWVEC (struct signatured_type *, dwarf2_per_objfile->n_type_units);
3369 sig_types_hash = allocate_signatured_type_table (objfile);
3371 for (i = 0; i < elements; i += 3)
3373 struct signatured_type *sig_type;
3376 cu_offset type_offset_in_tu;
3378 gdb_static_assert (sizeof (ULONGEST) >= 8);
3379 sect_offset sect_off
3380 = (sect_offset) extract_unsigned_integer (bytes, 8, BFD_ENDIAN_LITTLE);
3382 = (cu_offset) extract_unsigned_integer (bytes + 8, 8,
3384 signature = extract_unsigned_integer (bytes + 16, 8, BFD_ENDIAN_LITTLE);
3387 sig_type = OBSTACK_ZALLOC (&objfile->objfile_obstack,
3388 struct signatured_type);
3389 sig_type->signature = signature;
3390 sig_type->type_offset_in_tu = type_offset_in_tu;
3391 sig_type->per_cu.is_debug_types = 1;
3392 sig_type->per_cu.section = section;
3393 sig_type->per_cu.sect_off = sect_off;
3394 sig_type->per_cu.dwarf2_per_objfile = dwarf2_per_objfile;
3395 sig_type->per_cu.v.quick
3396 = OBSTACK_ZALLOC (&objfile->objfile_obstack,
3397 struct dwarf2_per_cu_quick_data);
3399 slot = htab_find_slot (sig_types_hash, sig_type, INSERT);
3402 dwarf2_per_objfile->all_type_units[i / 3] = sig_type;
3405 dwarf2_per_objfile->signatured_types = sig_types_hash;
3408 /* Create the signatured type hash table from .debug_names. */
3411 create_signatured_type_table_from_debug_names
3412 (struct dwarf2_per_objfile *dwarf2_per_objfile,
3413 const mapped_debug_names &map,
3414 struct dwarf2_section_info *section,
3415 struct dwarf2_section_info *abbrev_section)
3417 struct objfile *objfile = dwarf2_per_objfile->objfile;
3419 dwarf2_read_section (objfile, section);
3420 dwarf2_read_section (objfile, abbrev_section);
3422 dwarf2_per_objfile->n_type_units
3423 = dwarf2_per_objfile->n_allocated_type_units
3425 dwarf2_per_objfile->all_type_units
3426 = XNEWVEC (struct signatured_type *, dwarf2_per_objfile->n_type_units);
3428 htab_t sig_types_hash = allocate_signatured_type_table (objfile);
3430 for (uint32_t i = 0; i < map.tu_count; ++i)
3432 struct signatured_type *sig_type;
3435 cu_offset type_offset_in_tu;
3437 sect_offset sect_off
3438 = (sect_offset) (extract_unsigned_integer
3439 (map.tu_table_reordered + i * map.offset_size,
3441 map.dwarf5_byte_order));
3443 comp_unit_head cu_header;
3444 read_and_check_comp_unit_head (dwarf2_per_objfile, &cu_header, section,
3446 section->buffer + to_underlying (sect_off),
3449 sig_type = OBSTACK_ZALLOC (&objfile->objfile_obstack,
3450 struct signatured_type);
3451 sig_type->signature = cu_header.signature;
3452 sig_type->type_offset_in_tu = cu_header.type_cu_offset_in_tu;
3453 sig_type->per_cu.is_debug_types = 1;
3454 sig_type->per_cu.section = section;
3455 sig_type->per_cu.sect_off = sect_off;
3456 sig_type->per_cu.dwarf2_per_objfile = dwarf2_per_objfile;
3457 sig_type->per_cu.v.quick
3458 = OBSTACK_ZALLOC (&objfile->objfile_obstack,
3459 struct dwarf2_per_cu_quick_data);
3461 slot = htab_find_slot (sig_types_hash, sig_type, INSERT);
3464 dwarf2_per_objfile->all_type_units[i] = sig_type;
3467 dwarf2_per_objfile->signatured_types = sig_types_hash;
3470 /* Read the address map data from the mapped index, and use it to
3471 populate the objfile's psymtabs_addrmap. */
3474 create_addrmap_from_index (struct dwarf2_per_objfile *dwarf2_per_objfile,
3475 struct mapped_index *index)
3477 struct objfile *objfile = dwarf2_per_objfile->objfile;
3478 struct gdbarch *gdbarch = get_objfile_arch (objfile);
3479 const gdb_byte *iter, *end;
3480 struct addrmap *mutable_map;
3483 auto_obstack temp_obstack;
3485 mutable_map = addrmap_create_mutable (&temp_obstack);
3487 iter = index->address_table.data ();
3488 end = iter + index->address_table.size ();
3490 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
3494 ULONGEST hi, lo, cu_index;
3495 lo = extract_unsigned_integer (iter, 8, BFD_ENDIAN_LITTLE);
3497 hi = extract_unsigned_integer (iter, 8, BFD_ENDIAN_LITTLE);
3499 cu_index = extract_unsigned_integer (iter, 4, BFD_ENDIAN_LITTLE);
3504 complaint (&symfile_complaints,
3505 _(".gdb_index address table has invalid range (%s - %s)"),
3506 hex_string (lo), hex_string (hi));
3510 if (cu_index >= dwarf2_per_objfile->n_comp_units)
3512 complaint (&symfile_complaints,
3513 _(".gdb_index address table has invalid CU number %u"),
3514 (unsigned) cu_index);
3518 lo = gdbarch_adjust_dwarf2_addr (gdbarch, lo + baseaddr);
3519 hi = gdbarch_adjust_dwarf2_addr (gdbarch, hi + baseaddr);
3520 addrmap_set_empty (mutable_map, lo, hi - 1,
3521 dw2_get_cutu (dwarf2_per_objfile, cu_index));
3524 objfile->psymtabs_addrmap = addrmap_create_fixed (mutable_map,
3525 &objfile->objfile_obstack);
3528 /* Read the address map data from DWARF-5 .debug_aranges, and use it to
3529 populate the objfile's psymtabs_addrmap. */
3532 create_addrmap_from_aranges (struct dwarf2_per_objfile *dwarf2_per_objfile,
3533 struct dwarf2_section_info *section)
3535 struct objfile *objfile = dwarf2_per_objfile->objfile;
3536 bfd *abfd = objfile->obfd;
3537 struct gdbarch *gdbarch = get_objfile_arch (objfile);
3538 const CORE_ADDR baseaddr = ANOFFSET (objfile->section_offsets,
3539 SECT_OFF_TEXT (objfile));
3541 auto_obstack temp_obstack;
3542 addrmap *mutable_map = addrmap_create_mutable (&temp_obstack);
3544 std::unordered_map<sect_offset,
3545 dwarf2_per_cu_data *,
3546 gdb::hash_enum<sect_offset>>
3547 debug_info_offset_to_per_cu;
3548 for (int cui = 0; cui < dwarf2_per_objfile->n_comp_units; ++cui)
3550 dwarf2_per_cu_data *per_cu = dw2_get_cutu (dwarf2_per_objfile, cui);
3551 const auto insertpair
3552 = debug_info_offset_to_per_cu.emplace (per_cu->sect_off, per_cu);
3553 if (!insertpair.second)
3555 warning (_("Section .debug_aranges in %s has duplicate "
3556 "debug_info_offset %u, ignoring .debug_aranges."),
3557 objfile_name (objfile), to_underlying (per_cu->sect_off));
3562 dwarf2_read_section (objfile, section);
3564 const bfd_endian dwarf5_byte_order = gdbarch_byte_order (gdbarch);
3566 const gdb_byte *addr = section->buffer;
3568 while (addr < section->buffer + section->size)
3570 const gdb_byte *const entry_addr = addr;
3571 unsigned int bytes_read;
3573 const LONGEST entry_length = read_initial_length (abfd, addr,
3577 const gdb_byte *const entry_end = addr + entry_length;
3578 const bool dwarf5_is_dwarf64 = bytes_read != 4;
3579 const uint8_t offset_size = dwarf5_is_dwarf64 ? 8 : 4;
3580 if (addr + entry_length > section->buffer + section->size)
3582 warning (_("Section .debug_aranges in %s entry at offset %zu "
3583 "length %s exceeds section length %s, "
3584 "ignoring .debug_aranges."),
3585 objfile_name (objfile), entry_addr - section->buffer,
3586 plongest (bytes_read + entry_length),
3587 pulongest (section->size));
3591 /* The version number. */
3592 const uint16_t version = read_2_bytes (abfd, addr);
3596 warning (_("Section .debug_aranges in %s entry at offset %zu "
3597 "has unsupported version %d, ignoring .debug_aranges."),
3598 objfile_name (objfile), entry_addr - section->buffer,
3603 const uint64_t debug_info_offset
3604 = extract_unsigned_integer (addr, offset_size, dwarf5_byte_order);
3605 addr += offset_size;
3606 const auto per_cu_it
3607 = debug_info_offset_to_per_cu.find (sect_offset (debug_info_offset));
3608 if (per_cu_it == debug_info_offset_to_per_cu.cend ())
3610 warning (_("Section .debug_aranges in %s entry at offset %zu "
3611 "debug_info_offset %s does not exists, "
3612 "ignoring .debug_aranges."),
3613 objfile_name (objfile), entry_addr - section->buffer,
3614 pulongest (debug_info_offset));
3617 dwarf2_per_cu_data *const per_cu = per_cu_it->second;
3619 const uint8_t address_size = *addr++;
3620 if (address_size < 1 || address_size > 8)
3622 warning (_("Section .debug_aranges in %s entry at offset %zu "
3623 "address_size %u is invalid, ignoring .debug_aranges."),
3624 objfile_name (objfile), entry_addr - section->buffer,
3629 const uint8_t segment_selector_size = *addr++;
3630 if (segment_selector_size != 0)
3632 warning (_("Section .debug_aranges in %s entry at offset %zu "
3633 "segment_selector_size %u is not supported, "
3634 "ignoring .debug_aranges."),
3635 objfile_name (objfile), entry_addr - section->buffer,
3636 segment_selector_size);
3640 /* Must pad to an alignment boundary that is twice the address
3641 size. It is undocumented by the DWARF standard but GCC does
3643 for (size_t padding = ((-(addr - section->buffer))
3644 & (2 * address_size - 1));
3645 padding > 0; padding--)
3648 warning (_("Section .debug_aranges in %s entry at offset %zu "
3649 "padding is not zero, ignoring .debug_aranges."),
3650 objfile_name (objfile), entry_addr - section->buffer);
3656 if (addr + 2 * address_size > entry_end)
3658 warning (_("Section .debug_aranges in %s entry at offset %zu "
3659 "address list is not properly terminated, "
3660 "ignoring .debug_aranges."),
3661 objfile_name (objfile), entry_addr - section->buffer);
3664 ULONGEST start = extract_unsigned_integer (addr, address_size,
3666 addr += address_size;
3667 ULONGEST length = extract_unsigned_integer (addr, address_size,
3669 addr += address_size;
3670 if (start == 0 && length == 0)
3672 if (start == 0 && !dwarf2_per_objfile->has_section_at_zero)
3674 /* Symbol was eliminated due to a COMDAT group. */
3677 ULONGEST end = start + length;
3678 start = gdbarch_adjust_dwarf2_addr (gdbarch, start + baseaddr);
3679 end = gdbarch_adjust_dwarf2_addr (gdbarch, end + baseaddr);
3680 addrmap_set_empty (mutable_map, start, end - 1, per_cu);
3684 objfile->psymtabs_addrmap = addrmap_create_fixed (mutable_map,
3685 &objfile->objfile_obstack);
3688 /* The hash function for strings in the mapped index. This is the same as
3689 SYMBOL_HASH_NEXT, but we keep a separate copy to maintain control over the
3690 implementation. This is necessary because the hash function is tied to the
3691 format of the mapped index file. The hash values do not have to match with
3694 Use INT_MAX for INDEX_VERSION if you generate the current index format. */
3697 mapped_index_string_hash (int index_version, const void *p)
3699 const unsigned char *str = (const unsigned char *) p;
3703 while ((c = *str++) != 0)
3705 if (index_version >= 5)
3707 r = r * 67 + c - 113;
3713 /* Find a slot in the mapped index INDEX for the object named NAME.
3714 If NAME is found, set *VEC_OUT to point to the CU vector in the
3715 constant pool and return true. If NAME cannot be found, return
3719 find_slot_in_mapped_hash (struct mapped_index *index, const char *name,
3720 offset_type **vec_out)
3723 offset_type slot, step;
3724 int (*cmp) (const char *, const char *);
3726 gdb::unique_xmalloc_ptr<char> without_params;
3727 if (current_language->la_language == language_cplus
3728 || current_language->la_language == language_fortran
3729 || current_language->la_language == language_d)
3731 /* NAME is already canonical. Drop any qualifiers as .gdb_index does
3734 if (strchr (name, '(') != NULL)
3736 without_params = cp_remove_params (name);
3738 if (without_params != NULL)
3739 name = without_params.get ();
3743 /* Index version 4 did not support case insensitive searches. But the
3744 indices for case insensitive languages are built in lowercase, therefore
3745 simulate our NAME being searched is also lowercased. */
3746 hash = mapped_index_string_hash ((index->version == 4
3747 && case_sensitivity == case_sensitive_off
3748 ? 5 : index->version),
3751 slot = hash & (index->symbol_table.size () - 1);
3752 step = ((hash * 17) & (index->symbol_table.size () - 1)) | 1;
3753 cmp = (case_sensitivity == case_sensitive_on ? strcmp : strcasecmp);
3759 const auto &bucket = index->symbol_table[slot];
3760 if (bucket.name == 0 && bucket.vec == 0)
3763 str = index->constant_pool + MAYBE_SWAP (bucket.name);
3764 if (!cmp (name, str))
3766 *vec_out = (offset_type *) (index->constant_pool
3767 + MAYBE_SWAP (bucket.vec));
3771 slot = (slot + step) & (index->symbol_table.size () - 1);
3775 /* A helper function that reads the .gdb_index from SECTION and fills
3776 in MAP. FILENAME is the name of the file containing the section;
3777 it is used for error reporting. DEPRECATED_OK is nonzero if it is
3778 ok to use deprecated sections.
3780 CU_LIST, CU_LIST_ELEMENTS, TYPES_LIST, and TYPES_LIST_ELEMENTS are
3781 out parameters that are filled in with information about the CU and
3782 TU lists in the section.
3784 Returns 1 if all went well, 0 otherwise. */
3787 read_index_from_section (struct objfile *objfile,
3788 const char *filename,
3790 struct dwarf2_section_info *section,
3791 struct mapped_index *map,
3792 const gdb_byte **cu_list,
3793 offset_type *cu_list_elements,
3794 const gdb_byte **types_list,
3795 offset_type *types_list_elements)
3797 const gdb_byte *addr;
3798 offset_type version;
3799 offset_type *metadata;
3802 if (dwarf2_section_empty_p (section))
3805 /* Older elfutils strip versions could keep the section in the main
3806 executable while splitting it for the separate debug info file. */
3807 if ((get_section_flags (section) & SEC_HAS_CONTENTS) == 0)
3810 dwarf2_read_section (objfile, section);
3812 addr = section->buffer;
3813 /* Version check. */
3814 version = MAYBE_SWAP (*(offset_type *) addr);
3815 /* Versions earlier than 3 emitted every copy of a psymbol. This
3816 causes the index to behave very poorly for certain requests. Version 3
3817 contained incomplete addrmap. So, it seems better to just ignore such
3821 static int warning_printed = 0;
3822 if (!warning_printed)
3824 warning (_("Skipping obsolete .gdb_index section in %s."),
3826 warning_printed = 1;
3830 /* Index version 4 uses a different hash function than index version
3833 Versions earlier than 6 did not emit psymbols for inlined
3834 functions. Using these files will cause GDB not to be able to
3835 set breakpoints on inlined functions by name, so we ignore these
3836 indices unless the user has done
3837 "set use-deprecated-index-sections on". */
3838 if (version < 6 && !deprecated_ok)
3840 static int warning_printed = 0;
3841 if (!warning_printed)
3844 Skipping deprecated .gdb_index section in %s.\n\
3845 Do \"set use-deprecated-index-sections on\" before the file is read\n\
3846 to use the section anyway."),
3848 warning_printed = 1;
3852 /* Version 7 indices generated by gold refer to the CU for a symbol instead
3853 of the TU (for symbols coming from TUs),
3854 http://sourceware.org/bugzilla/show_bug.cgi?id=15021.
3855 Plus gold-generated indices can have duplicate entries for global symbols,
3856 http://sourceware.org/bugzilla/show_bug.cgi?id=15646.
3857 These are just performance bugs, and we can't distinguish gdb-generated
3858 indices from gold-generated ones, so issue no warning here. */
3860 /* Indexes with higher version than the one supported by GDB may be no
3861 longer backward compatible. */
3865 map->version = version;
3866 map->total_size = section->size;
3868 metadata = (offset_type *) (addr + sizeof (offset_type));
3871 *cu_list = addr + MAYBE_SWAP (metadata[i]);
3872 *cu_list_elements = ((MAYBE_SWAP (metadata[i + 1]) - MAYBE_SWAP (metadata[i]))
3876 *types_list = addr + MAYBE_SWAP (metadata[i]);
3877 *types_list_elements = ((MAYBE_SWAP (metadata[i + 1])
3878 - MAYBE_SWAP (metadata[i]))
3882 const gdb_byte *address_table = addr + MAYBE_SWAP (metadata[i]);
3883 const gdb_byte *address_table_end = addr + MAYBE_SWAP (metadata[i + 1]);
3885 = gdb::array_view<const gdb_byte> (address_table, address_table_end);
3888 const gdb_byte *symbol_table = addr + MAYBE_SWAP (metadata[i]);
3889 const gdb_byte *symbol_table_end = addr + MAYBE_SWAP (metadata[i + 1]);
3891 = gdb::array_view<mapped_index::symbol_table_slot>
3892 ((mapped_index::symbol_table_slot *) symbol_table,
3893 (mapped_index::symbol_table_slot *) symbol_table_end);
3896 map->constant_pool = (char *) (addr + MAYBE_SWAP (metadata[i]));
3901 /* Read .gdb_index. If everything went ok, initialize the "quick"
3902 elements of all the CUs and return 1. Otherwise, return 0. */
3905 dwarf2_read_index (struct objfile *objfile)
3907 struct mapped_index local_map, *map;
3908 const gdb_byte *cu_list, *types_list, *dwz_list = NULL;
3909 offset_type cu_list_elements, types_list_elements, dwz_list_elements = 0;
3910 struct dwz_file *dwz;
3911 struct dwarf2_per_objfile *dwarf2_per_objfile
3912 = get_dwarf2_per_objfile (objfile);
3914 if (!read_index_from_section (objfile, objfile_name (objfile),
3915 use_deprecated_index_sections,
3916 &dwarf2_per_objfile->gdb_index, &local_map,
3917 &cu_list, &cu_list_elements,
3918 &types_list, &types_list_elements))
3921 /* Don't use the index if it's empty. */
3922 if (local_map.symbol_table.empty ())
3925 /* If there is a .dwz file, read it so we can get its CU list as
3927 dwz = dwarf2_get_dwz_file (dwarf2_per_objfile);
3930 struct mapped_index dwz_map;
3931 const gdb_byte *dwz_types_ignore;
3932 offset_type dwz_types_elements_ignore;
3934 if (!read_index_from_section (objfile, bfd_get_filename (dwz->dwz_bfd),
3936 &dwz->gdb_index, &dwz_map,
3937 &dwz_list, &dwz_list_elements,
3939 &dwz_types_elements_ignore))
3941 warning (_("could not read '.gdb_index' section from %s; skipping"),
3942 bfd_get_filename (dwz->dwz_bfd));
3947 create_cus_from_index (objfile, cu_list, cu_list_elements, dwz_list,
3950 if (types_list_elements)
3952 struct dwarf2_section_info *section;
3954 /* We can only handle a single .debug_types when we have an
3956 if (VEC_length (dwarf2_section_info_def, dwarf2_per_objfile->types) != 1)
3959 section = VEC_index (dwarf2_section_info_def,
3960 dwarf2_per_objfile->types, 0);
3962 create_signatured_type_table_from_index (objfile, section, types_list,
3963 types_list_elements);
3966 create_addrmap_from_index (dwarf2_per_objfile, &local_map);
3968 map = XOBNEW (&objfile->objfile_obstack, struct mapped_index);
3969 map = new (map) mapped_index ();
3972 dwarf2_per_objfile->index_table = map;
3973 dwarf2_per_objfile->using_index = 1;
3974 dwarf2_per_objfile->quick_file_names_table =
3975 create_quick_file_names_table (dwarf2_per_objfile->n_comp_units);
3980 /* die_reader_func for dw2_get_file_names. */
3983 dw2_get_file_names_reader (const struct die_reader_specs *reader,
3984 const gdb_byte *info_ptr,
3985 struct die_info *comp_unit_die,
3989 struct dwarf2_cu *cu = reader->cu;
3990 struct dwarf2_per_cu_data *this_cu = cu->per_cu;
3991 struct dwarf2_per_objfile *dwarf2_per_objfile
3992 = cu->per_cu->dwarf2_per_objfile;
3993 struct objfile *objfile = dwarf2_per_objfile->objfile;
3994 struct dwarf2_per_cu_data *lh_cu;
3995 struct attribute *attr;
3998 struct quick_file_names *qfn;
4000 gdb_assert (! this_cu->is_debug_types);
4002 /* Our callers never want to match partial units -- instead they
4003 will match the enclosing full CU. */
4004 if (comp_unit_die->tag == DW_TAG_partial_unit)
4006 this_cu->v.quick->no_file_data = 1;
4014 sect_offset line_offset {};
4016 attr = dwarf2_attr (comp_unit_die, DW_AT_stmt_list, cu);
4019 struct quick_file_names find_entry;
4021 line_offset = (sect_offset) DW_UNSND (attr);
4023 /* We may have already read in this line header (TU line header sharing).
4024 If we have we're done. */
4025 find_entry.hash.dwo_unit = cu->dwo_unit;
4026 find_entry.hash.line_sect_off = line_offset;
4027 slot = htab_find_slot (dwarf2_per_objfile->quick_file_names_table,
4028 &find_entry, INSERT);
4031 lh_cu->v.quick->file_names = (struct quick_file_names *) *slot;
4035 lh = dwarf_decode_line_header (line_offset, cu);
4039 lh_cu->v.quick->no_file_data = 1;
4043 qfn = XOBNEW (&objfile->objfile_obstack, struct quick_file_names);
4044 qfn->hash.dwo_unit = cu->dwo_unit;
4045 qfn->hash.line_sect_off = line_offset;
4046 gdb_assert (slot != NULL);
4049 file_and_directory fnd = find_file_and_directory (comp_unit_die, cu);
4051 qfn->num_file_names = lh->file_names.size ();
4053 XOBNEWVEC (&objfile->objfile_obstack, const char *, lh->file_names.size ());
4054 for (i = 0; i < lh->file_names.size (); ++i)
4055 qfn->file_names[i] = file_full_name (i + 1, lh.get (), fnd.comp_dir);
4056 qfn->real_names = NULL;
4058 lh_cu->v.quick->file_names = qfn;
4061 /* A helper for the "quick" functions which attempts to read the line
4062 table for THIS_CU. */
4064 static struct quick_file_names *
4065 dw2_get_file_names (struct dwarf2_per_cu_data *this_cu)
4067 /* This should never be called for TUs. */
4068 gdb_assert (! this_cu->is_debug_types);
4069 /* Nor type unit groups. */
4070 gdb_assert (! IS_TYPE_UNIT_GROUP (this_cu));
4072 if (this_cu->v.quick->file_names != NULL)
4073 return this_cu->v.quick->file_names;
4074 /* If we know there is no line data, no point in looking again. */
4075 if (this_cu->v.quick->no_file_data)
4078 init_cutu_and_read_dies_simple (this_cu, dw2_get_file_names_reader, NULL);
4080 if (this_cu->v.quick->no_file_data)
4082 return this_cu->v.quick->file_names;
4085 /* A helper for the "quick" functions which computes and caches the
4086 real path for a given file name from the line table. */
4089 dw2_get_real_path (struct objfile *objfile,
4090 struct quick_file_names *qfn, int index)
4092 if (qfn->real_names == NULL)
4093 qfn->real_names = OBSTACK_CALLOC (&objfile->objfile_obstack,
4094 qfn->num_file_names, const char *);
4096 if (qfn->real_names[index] == NULL)
4097 qfn->real_names[index] = gdb_realpath (qfn->file_names[index]).release ();
4099 return qfn->real_names[index];
4102 static struct symtab *
4103 dw2_find_last_source_symtab (struct objfile *objfile)
4105 struct dwarf2_per_objfile *dwarf2_per_objfile
4106 = get_dwarf2_per_objfile (objfile);
4107 int index = dwarf2_per_objfile->n_comp_units - 1;
4108 dwarf2_per_cu_data *dwarf_cu = dw2_get_cutu (dwarf2_per_objfile, index);
4109 compunit_symtab *cust = dw2_instantiate_symtab (dwarf_cu);
4114 return compunit_primary_filetab (cust);
4117 /* Traversal function for dw2_forget_cached_source_info. */
4120 dw2_free_cached_file_names (void **slot, void *info)
4122 struct quick_file_names *file_data = (struct quick_file_names *) *slot;
4124 if (file_data->real_names)
4128 for (i = 0; i < file_data->num_file_names; ++i)
4130 xfree ((void*) file_data->real_names[i]);
4131 file_data->real_names[i] = NULL;
4139 dw2_forget_cached_source_info (struct objfile *objfile)
4141 struct dwarf2_per_objfile *dwarf2_per_objfile
4142 = get_dwarf2_per_objfile (objfile);
4144 htab_traverse_noresize (dwarf2_per_objfile->quick_file_names_table,
4145 dw2_free_cached_file_names, NULL);
4148 /* Helper function for dw2_map_symtabs_matching_filename that expands
4149 the symtabs and calls the iterator. */
4152 dw2_map_expand_apply (struct objfile *objfile,
4153 struct dwarf2_per_cu_data *per_cu,
4154 const char *name, const char *real_path,
4155 gdb::function_view<bool (symtab *)> callback)
4157 struct compunit_symtab *last_made = objfile->compunit_symtabs;
4159 /* Don't visit already-expanded CUs. */
4160 if (per_cu->v.quick->compunit_symtab)
4163 /* This may expand more than one symtab, and we want to iterate over
4165 dw2_instantiate_symtab (per_cu);
4167 return iterate_over_some_symtabs (name, real_path, objfile->compunit_symtabs,
4168 last_made, callback);
4171 /* Implementation of the map_symtabs_matching_filename method. */
4174 dw2_map_symtabs_matching_filename
4175 (struct objfile *objfile, const char *name, const char *real_path,
4176 gdb::function_view<bool (symtab *)> callback)
4179 const char *name_basename = lbasename (name);
4180 struct dwarf2_per_objfile *dwarf2_per_objfile
4181 = get_dwarf2_per_objfile (objfile);
4183 /* The rule is CUs specify all the files, including those used by
4184 any TU, so there's no need to scan TUs here. */
4186 for (int i = 0; i < dwarf2_per_objfile->n_comp_units; ++i)
4189 struct dwarf2_per_cu_data *per_cu = dw2_get_cu (dwarf2_per_objfile, i);
4190 struct quick_file_names *file_data;
4192 /* We only need to look at symtabs not already expanded. */
4193 if (per_cu->v.quick->compunit_symtab)
4196 file_data = dw2_get_file_names (per_cu);
4197 if (file_data == NULL)
4200 for (j = 0; j < file_data->num_file_names; ++j)
4202 const char *this_name = file_data->file_names[j];
4203 const char *this_real_name;
4205 if (compare_filenames_for_search (this_name, name))
4207 if (dw2_map_expand_apply (objfile, per_cu, name, real_path,
4213 /* Before we invoke realpath, which can get expensive when many
4214 files are involved, do a quick comparison of the basenames. */
4215 if (! basenames_may_differ
4216 && FILENAME_CMP (lbasename (this_name), name_basename) != 0)
4219 this_real_name = dw2_get_real_path (objfile, file_data, j);
4220 if (compare_filenames_for_search (this_real_name, name))
4222 if (dw2_map_expand_apply (objfile, per_cu, name, real_path,
4228 if (real_path != NULL)
4230 gdb_assert (IS_ABSOLUTE_PATH (real_path));
4231 gdb_assert (IS_ABSOLUTE_PATH (name));
4232 if (this_real_name != NULL
4233 && FILENAME_CMP (real_path, this_real_name) == 0)
4235 if (dw2_map_expand_apply (objfile, per_cu, name, real_path,
4247 /* Struct used to manage iterating over all CUs looking for a symbol. */
4249 struct dw2_symtab_iterator
4251 /* The dwarf2_per_objfile owning the CUs we are iterating on. */
4252 struct dwarf2_per_objfile *dwarf2_per_objfile;
4253 /* If non-zero, only look for symbols that match BLOCK_INDEX. */
4254 int want_specific_block;
4255 /* One of GLOBAL_BLOCK or STATIC_BLOCK.
4256 Unused if !WANT_SPECIFIC_BLOCK. */
4258 /* The kind of symbol we're looking for. */
4260 /* The list of CUs from the index entry of the symbol,
4261 or NULL if not found. */
4263 /* The next element in VEC to look at. */
4265 /* The number of elements in VEC, or zero if there is no match. */
4267 /* Have we seen a global version of the symbol?
4268 If so we can ignore all further global instances.
4269 This is to work around gold/15646, inefficient gold-generated
4274 /* Initialize the index symtab iterator ITER.
4275 If WANT_SPECIFIC_BLOCK is non-zero, only look for symbols
4276 in block BLOCK_INDEX. Otherwise BLOCK_INDEX is ignored. */
4279 dw2_symtab_iter_init (struct dw2_symtab_iterator *iter,
4280 struct dwarf2_per_objfile *dwarf2_per_objfile,
4281 int want_specific_block,
4286 iter->dwarf2_per_objfile = dwarf2_per_objfile;
4287 iter->want_specific_block = want_specific_block;
4288 iter->block_index = block_index;
4289 iter->domain = domain;
4291 iter->global_seen = 0;
4293 mapped_index *index = dwarf2_per_objfile->index_table;
4295 /* index is NULL if OBJF_READNOW. */
4296 if (index != NULL && find_slot_in_mapped_hash (index, name, &iter->vec))
4297 iter->length = MAYBE_SWAP (*iter->vec);
4305 /* Return the next matching CU or NULL if there are no more. */
4307 static struct dwarf2_per_cu_data *
4308 dw2_symtab_iter_next (struct dw2_symtab_iterator *iter)
4310 struct dwarf2_per_objfile *dwarf2_per_objfile = iter->dwarf2_per_objfile;
4312 for ( ; iter->next < iter->length; ++iter->next)
4314 offset_type cu_index_and_attrs =
4315 MAYBE_SWAP (iter->vec[iter->next + 1]);
4316 offset_type cu_index = GDB_INDEX_CU_VALUE (cu_index_and_attrs);
4317 struct dwarf2_per_cu_data *per_cu;
4318 int want_static = iter->block_index != GLOBAL_BLOCK;
4319 /* This value is only valid for index versions >= 7. */
4320 int is_static = GDB_INDEX_SYMBOL_STATIC_VALUE (cu_index_and_attrs);
4321 gdb_index_symbol_kind symbol_kind =
4322 GDB_INDEX_SYMBOL_KIND_VALUE (cu_index_and_attrs);
4323 /* Only check the symbol attributes if they're present.
4324 Indices prior to version 7 don't record them,
4325 and indices >= 7 may elide them for certain symbols
4326 (gold does this). */
4328 (dwarf2_per_objfile->index_table->version >= 7
4329 && symbol_kind != GDB_INDEX_SYMBOL_KIND_NONE);
4331 /* Don't crash on bad data. */
4332 if (cu_index >= (dwarf2_per_objfile->n_comp_units
4333 + dwarf2_per_objfile->n_type_units))
4335 complaint (&symfile_complaints,
4336 _(".gdb_index entry has bad CU index"
4338 objfile_name (dwarf2_per_objfile->objfile));
4342 per_cu = dw2_get_cutu (dwarf2_per_objfile, cu_index);
4344 /* Skip if already read in. */
4345 if (per_cu->v.quick->compunit_symtab)
4348 /* Check static vs global. */
4351 if (iter->want_specific_block
4352 && want_static != is_static)
4354 /* Work around gold/15646. */
4355 if (!is_static && iter->global_seen)
4358 iter->global_seen = 1;
4361 /* Only check the symbol's kind if it has one. */
4364 switch (iter->domain)
4367 if (symbol_kind != GDB_INDEX_SYMBOL_KIND_VARIABLE
4368 && symbol_kind != GDB_INDEX_SYMBOL_KIND_FUNCTION
4369 /* Some types are also in VAR_DOMAIN. */
4370 && symbol_kind != GDB_INDEX_SYMBOL_KIND_TYPE)
4374 if (symbol_kind != GDB_INDEX_SYMBOL_KIND_TYPE)
4378 if (symbol_kind != GDB_INDEX_SYMBOL_KIND_OTHER)
4393 static struct compunit_symtab *
4394 dw2_lookup_symbol (struct objfile *objfile, int block_index,
4395 const char *name, domain_enum domain)
4397 struct compunit_symtab *stab_best = NULL;
4398 struct dwarf2_per_objfile *dwarf2_per_objfile
4399 = get_dwarf2_per_objfile (objfile);
4401 lookup_name_info lookup_name (name, symbol_name_match_type::FULL);
4403 struct dw2_symtab_iterator iter;
4404 struct dwarf2_per_cu_data *per_cu;
4406 dw2_symtab_iter_init (&iter, dwarf2_per_objfile, 1, block_index, domain, name);
4408 while ((per_cu = dw2_symtab_iter_next (&iter)) != NULL)
4410 struct symbol *sym, *with_opaque = NULL;
4411 struct compunit_symtab *stab = dw2_instantiate_symtab (per_cu);
4412 const struct blockvector *bv = COMPUNIT_BLOCKVECTOR (stab);
4413 struct block *block = BLOCKVECTOR_BLOCK (bv, block_index);
4415 sym = block_find_symbol (block, name, domain,
4416 block_find_non_opaque_type_preferred,
4419 /* Some caution must be observed with overloaded functions
4420 and methods, since the index will not contain any overload
4421 information (but NAME might contain it). */
4424 && SYMBOL_MATCHES_SEARCH_NAME (sym, lookup_name))
4426 if (with_opaque != NULL
4427 && SYMBOL_MATCHES_SEARCH_NAME (with_opaque, lookup_name))
4430 /* Keep looking through other CUs. */
4437 dw2_print_stats (struct objfile *objfile)
4439 struct dwarf2_per_objfile *dwarf2_per_objfile
4440 = get_dwarf2_per_objfile (objfile);
4441 int total = dwarf2_per_objfile->n_comp_units + dwarf2_per_objfile->n_type_units;
4444 for (int i = 0; i < total; ++i)
4446 struct dwarf2_per_cu_data *per_cu = dw2_get_cutu (dwarf2_per_objfile, i);
4448 if (!per_cu->v.quick->compunit_symtab)
4451 printf_filtered (_(" Number of read CUs: %d\n"), total - count);
4452 printf_filtered (_(" Number of unread CUs: %d\n"), count);
4455 /* This dumps minimal information about the index.
4456 It is called via "mt print objfiles".
4457 One use is to verify .gdb_index has been loaded by the
4458 gdb.dwarf2/gdb-index.exp testcase. */
4461 dw2_dump (struct objfile *objfile)
4463 struct dwarf2_per_objfile *dwarf2_per_objfile
4464 = get_dwarf2_per_objfile (objfile);
4466 gdb_assert (dwarf2_per_objfile->using_index);
4467 printf_filtered (".gdb_index:");
4468 if (dwarf2_per_objfile->index_table != NULL)
4470 printf_filtered (" version %d\n",
4471 dwarf2_per_objfile->index_table->version);
4474 printf_filtered (" faked for \"readnow\"\n");
4475 printf_filtered ("\n");
4479 dw2_relocate (struct objfile *objfile,
4480 const struct section_offsets *new_offsets,
4481 const struct section_offsets *delta)
4483 /* There's nothing to relocate here. */
4487 dw2_expand_symtabs_for_function (struct objfile *objfile,
4488 const char *func_name)
4490 struct dwarf2_per_objfile *dwarf2_per_objfile
4491 = get_dwarf2_per_objfile (objfile);
4493 struct dw2_symtab_iterator iter;
4494 struct dwarf2_per_cu_data *per_cu;
4496 /* Note: It doesn't matter what we pass for block_index here. */
4497 dw2_symtab_iter_init (&iter, dwarf2_per_objfile, 0, GLOBAL_BLOCK, VAR_DOMAIN,
4500 while ((per_cu = dw2_symtab_iter_next (&iter)) != NULL)
4501 dw2_instantiate_symtab (per_cu);
4506 dw2_expand_all_symtabs (struct objfile *objfile)
4508 struct dwarf2_per_objfile *dwarf2_per_objfile
4509 = get_dwarf2_per_objfile (objfile);
4510 int total_units = (dwarf2_per_objfile->n_comp_units
4511 + dwarf2_per_objfile->n_type_units);
4513 for (int i = 0; i < total_units; ++i)
4515 struct dwarf2_per_cu_data *per_cu
4516 = dw2_get_cutu (dwarf2_per_objfile, i);
4518 dw2_instantiate_symtab (per_cu);
4523 dw2_expand_symtabs_with_fullname (struct objfile *objfile,
4524 const char *fullname)
4526 struct dwarf2_per_objfile *dwarf2_per_objfile
4527 = get_dwarf2_per_objfile (objfile);
4529 /* We don't need to consider type units here.
4530 This is only called for examining code, e.g. expand_line_sal.
4531 There can be an order of magnitude (or more) more type units
4532 than comp units, and we avoid them if we can. */
4534 for (int i = 0; i < dwarf2_per_objfile->n_comp_units; ++i)
4537 struct dwarf2_per_cu_data *per_cu = dw2_get_cutu (dwarf2_per_objfile, i);
4538 struct quick_file_names *file_data;
4540 /* We only need to look at symtabs not already expanded. */
4541 if (per_cu->v.quick->compunit_symtab)
4544 file_data = dw2_get_file_names (per_cu);
4545 if (file_data == NULL)
4548 for (j = 0; j < file_data->num_file_names; ++j)
4550 const char *this_fullname = file_data->file_names[j];
4552 if (filename_cmp (this_fullname, fullname) == 0)
4554 dw2_instantiate_symtab (per_cu);
4562 dw2_map_matching_symbols (struct objfile *objfile,
4563 const char * name, domain_enum domain,
4565 int (*callback) (struct block *,
4566 struct symbol *, void *),
4567 void *data, symbol_name_match_type match,
4568 symbol_compare_ftype *ordered_compare)
4570 /* Currently unimplemented; used for Ada. The function can be called if the
4571 current language is Ada for a non-Ada objfile using GNU index. As Ada
4572 does not look for non-Ada symbols this function should just return. */
4575 /* Symbol name matcher for .gdb_index names.
4577 Symbol names in .gdb_index have a few particularities:
4579 - There's no indication of which is the language of each symbol.
4581 Since each language has its own symbol name matching algorithm,
4582 and we don't know which language is the right one, we must match
4583 each symbol against all languages. This would be a potential
4584 performance problem if it were not mitigated by the
4585 mapped_index::name_components lookup table, which significantly
4586 reduces the number of times we need to call into this matcher,
4587 making it a non-issue.
4589 - Symbol names in the index have no overload (parameter)
4590 information. I.e., in C++, "foo(int)" and "foo(long)" both
4591 appear as "foo" in the index, for example.
4593 This means that the lookup names passed to the symbol name
4594 matcher functions must have no parameter information either
4595 because (e.g.) symbol search name "foo" does not match
4596 lookup-name "foo(int)" [while swapping search name for lookup
4599 class gdb_index_symbol_name_matcher
4602 /* Prepares the vector of comparison functions for LOOKUP_NAME. */
4603 gdb_index_symbol_name_matcher (const lookup_name_info &lookup_name);
4605 /* Walk all the matcher routines and match SYMBOL_NAME against them.
4606 Returns true if any matcher matches. */
4607 bool matches (const char *symbol_name);
4610 /* A reference to the lookup name we're matching against. */
4611 const lookup_name_info &m_lookup_name;
4613 /* A vector holding all the different symbol name matchers, for all
4615 std::vector<symbol_name_matcher_ftype *> m_symbol_name_matcher_funcs;
4618 gdb_index_symbol_name_matcher::gdb_index_symbol_name_matcher
4619 (const lookup_name_info &lookup_name)
4620 : m_lookup_name (lookup_name)
4622 /* Prepare the vector of comparison functions upfront, to avoid
4623 doing the same work for each symbol. Care is taken to avoid
4624 matching with the same matcher more than once if/when multiple
4625 languages use the same matcher function. */
4626 auto &matchers = m_symbol_name_matcher_funcs;
4627 matchers.reserve (nr_languages);
4629 matchers.push_back (default_symbol_name_matcher);
4631 for (int i = 0; i < nr_languages; i++)
4633 const language_defn *lang = language_def ((enum language) i);
4634 symbol_name_matcher_ftype *name_matcher
4635 = get_symbol_name_matcher (lang, m_lookup_name);
4637 /* Don't insert the same comparison routine more than once.
4638 Note that we do this linear walk instead of a seemingly
4639 cheaper sorted insert, or use a std::set or something like
4640 that, because relative order of function addresses is not
4641 stable. This is not a problem in practice because the number
4642 of supported languages is low, and the cost here is tiny
4643 compared to the number of searches we'll do afterwards using
4645 if (name_matcher != default_symbol_name_matcher
4646 && (std::find (matchers.begin (), matchers.end (), name_matcher)
4647 == matchers.end ()))
4648 matchers.push_back (name_matcher);
4653 gdb_index_symbol_name_matcher::matches (const char *symbol_name)
4655 for (auto matches_name : m_symbol_name_matcher_funcs)
4656 if (matches_name (symbol_name, m_lookup_name, NULL))
4662 /* Starting from a search name, return the string that finds the upper
4663 bound of all strings that start with SEARCH_NAME in a sorted name
4664 list. Returns the empty string to indicate that the upper bound is
4665 the end of the list. */
4668 make_sort_after_prefix_name (const char *search_name)
4670 /* When looking to complete "func", we find the upper bound of all
4671 symbols that start with "func" by looking for where we'd insert
4672 the closest string that would follow "func" in lexicographical
4673 order. Usually, that's "func"-with-last-character-incremented,
4674 i.e. "fund". Mind non-ASCII characters, though. Usually those
4675 will be UTF-8 multi-byte sequences, but we can't be certain.
4676 Especially mind the 0xff character, which is a valid character in
4677 non-UTF-8 source character sets (e.g. Latin1 'ÿ'), and we can't
4678 rule out compilers allowing it in identifiers. Note that
4679 conveniently, strcmp/strcasecmp are specified to compare
4680 characters interpreted as unsigned char. So what we do is treat
4681 the whole string as a base 256 number composed of a sequence of
4682 base 256 "digits" and add 1 to it. I.e., adding 1 to 0xff wraps
4683 to 0, and carries 1 to the following more-significant position.
4684 If the very first character in SEARCH_NAME ends up incremented
4685 and carries/overflows, then the upper bound is the end of the
4686 list. The string after the empty string is also the empty
4689 Some examples of this operation:
4691 SEARCH_NAME => "+1" RESULT
4695 "\xff" "a" "\xff" => "\xff" "b"
4700 Then, with these symbols for example:
4706 completing "func" looks for symbols between "func" and
4707 "func"-with-last-character-incremented, i.e. "fund" (exclusive),
4708 which finds "func" and "func1", but not "fund".
4712 funcÿ (Latin1 'ÿ' [0xff])
4716 completing "funcÿ" looks for symbols between "funcÿ" and "fund"
4717 (exclusive), which finds "funcÿ" and "funcÿ1", but not "fund".
4721 ÿÿ (Latin1 'ÿ' [0xff])
4724 completing "ÿ" or "ÿÿ" looks for symbols between between "ÿÿ" and
4725 the end of the list.
4727 std::string after = search_name;
4728 while (!after.empty () && (unsigned char) after.back () == 0xff)
4730 if (!after.empty ())
4731 after.back () = (unsigned char) after.back () + 1;
4735 /* See declaration. */
4737 std::pair<std::vector<name_component>::const_iterator,
4738 std::vector<name_component>::const_iterator>
4739 mapped_index_base::find_name_components_bounds
4740 (const lookup_name_info &lookup_name_without_params) const
4743 = this->name_components_casing == case_sensitive_on ? strcmp : strcasecmp;
4746 = lookup_name_without_params.cplus ().lookup_name ().c_str ();
4748 /* Comparison function object for lower_bound that matches against a
4749 given symbol name. */
4750 auto lookup_compare_lower = [&] (const name_component &elem,
4753 const char *elem_qualified = this->symbol_name_at (elem.idx);
4754 const char *elem_name = elem_qualified + elem.name_offset;
4755 return name_cmp (elem_name, name) < 0;
4758 /* Comparison function object for upper_bound that matches against a
4759 given symbol name. */
4760 auto lookup_compare_upper = [&] (const char *name,
4761 const name_component &elem)
4763 const char *elem_qualified = this->symbol_name_at (elem.idx);
4764 const char *elem_name = elem_qualified + elem.name_offset;
4765 return name_cmp (name, elem_name) < 0;
4768 auto begin = this->name_components.begin ();
4769 auto end = this->name_components.end ();
4771 /* Find the lower bound. */
4774 if (lookup_name_without_params.completion_mode () && cplus[0] == '\0')
4777 return std::lower_bound (begin, end, cplus, lookup_compare_lower);
4780 /* Find the upper bound. */
4783 if (lookup_name_without_params.completion_mode ())
4785 /* In completion mode, we want UPPER to point past all
4786 symbols names that have the same prefix. I.e., with
4787 these symbols, and completing "func":
4789 function << lower bound
4791 other_function << upper bound
4793 We find the upper bound by looking for the insertion
4794 point of "func"-with-last-character-incremented,
4796 std::string after = make_sort_after_prefix_name (cplus);
4799 return std::lower_bound (lower, end, after.c_str (),
4800 lookup_compare_lower);
4803 return std::upper_bound (lower, end, cplus, lookup_compare_upper);
4806 return {lower, upper};
4809 /* See declaration. */
4812 mapped_index_base::build_name_components ()
4814 if (!this->name_components.empty ())
4817 this->name_components_casing = case_sensitivity;
4819 = this->name_components_casing == case_sensitive_on ? strcmp : strcasecmp;
4821 /* The code below only knows how to break apart components of C++
4822 symbol names (and other languages that use '::' as
4823 namespace/module separator). If we add support for wild matching
4824 to some language that uses some other operator (E.g., Ada, Go and
4825 D use '.'), then we'll need to try splitting the symbol name
4826 according to that language too. Note that Ada does support wild
4827 matching, but doesn't currently support .gdb_index. */
4828 auto count = this->symbol_name_count ();
4829 for (offset_type idx = 0; idx < count; idx++)
4831 if (this->symbol_name_slot_invalid (idx))
4834 const char *name = this->symbol_name_at (idx);
4836 /* Add each name component to the name component table. */
4837 unsigned int previous_len = 0;
4838 for (unsigned int current_len = cp_find_first_component (name);
4839 name[current_len] != '\0';
4840 current_len += cp_find_first_component (name + current_len))
4842 gdb_assert (name[current_len] == ':');
4843 this->name_components.push_back ({previous_len, idx});
4844 /* Skip the '::'. */
4846 previous_len = current_len;
4848 this->name_components.push_back ({previous_len, idx});
4851 /* Sort name_components elements by name. */
4852 auto name_comp_compare = [&] (const name_component &left,
4853 const name_component &right)
4855 const char *left_qualified = this->symbol_name_at (left.idx);
4856 const char *right_qualified = this->symbol_name_at (right.idx);
4858 const char *left_name = left_qualified + left.name_offset;
4859 const char *right_name = right_qualified + right.name_offset;
4861 return name_cmp (left_name, right_name) < 0;
4864 std::sort (this->name_components.begin (),
4865 this->name_components.end (),
4869 /* Helper for dw2_expand_symtabs_matching that works with a
4870 mapped_index_base instead of the containing objfile. This is split
4871 to a separate function in order to be able to unit test the
4872 name_components matching using a mock mapped_index_base. For each
4873 symbol name that matches, calls MATCH_CALLBACK, passing it the
4874 symbol's index in the mapped_index_base symbol table. */
4877 dw2_expand_symtabs_matching_symbol
4878 (mapped_index_base &index,
4879 const lookup_name_info &lookup_name_in,
4880 gdb::function_view<expand_symtabs_symbol_matcher_ftype> symbol_matcher,
4881 enum search_domain kind,
4882 gdb::function_view<void (offset_type)> match_callback)
4884 lookup_name_info lookup_name_without_params
4885 = lookup_name_in.make_ignore_params ();
4886 gdb_index_symbol_name_matcher lookup_name_matcher
4887 (lookup_name_without_params);
4889 /* Build the symbol name component sorted vector, if we haven't
4891 index.build_name_components ();
4893 auto bounds = index.find_name_components_bounds (lookup_name_without_params);
4895 /* Now for each symbol name in range, check to see if we have a name
4896 match, and if so, call the MATCH_CALLBACK callback. */
4898 /* The same symbol may appear more than once in the range though.
4899 E.g., if we're looking for symbols that complete "w", and we have
4900 a symbol named "w1::w2", we'll find the two name components for
4901 that same symbol in the range. To be sure we only call the
4902 callback once per symbol, we first collect the symbol name
4903 indexes that matched in a temporary vector and ignore
4905 std::vector<offset_type> matches;
4906 matches.reserve (std::distance (bounds.first, bounds.second));
4908 for (; bounds.first != bounds.second; ++bounds.first)
4910 const char *qualified = index.symbol_name_at (bounds.first->idx);
4912 if (!lookup_name_matcher.matches (qualified)
4913 || (symbol_matcher != NULL && !symbol_matcher (qualified)))
4916 matches.push_back (bounds.first->idx);
4919 std::sort (matches.begin (), matches.end ());
4921 /* Finally call the callback, once per match. */
4923 for (offset_type idx : matches)
4927 match_callback (idx);
4932 /* Above we use a type wider than idx's for 'prev', since 0 and
4933 (offset_type)-1 are both possible values. */
4934 static_assert (sizeof (prev) > sizeof (offset_type), "");
4939 namespace selftests { namespace dw2_expand_symtabs_matching {
4941 /* A mock .gdb_index/.debug_names-like name index table, enough to
4942 exercise dw2_expand_symtabs_matching_symbol, which works with the
4943 mapped_index_base interface. Builds an index from the symbol list
4944 passed as parameter to the constructor. */
4945 class mock_mapped_index : public mapped_index_base
4948 mock_mapped_index (gdb::array_view<const char *> symbols)
4949 : m_symbol_table (symbols)
4952 DISABLE_COPY_AND_ASSIGN (mock_mapped_index);
4954 /* Return the number of names in the symbol table. */
4955 virtual size_t symbol_name_count () const
4957 return m_symbol_table.size ();
4960 /* Get the name of the symbol at IDX in the symbol table. */
4961 virtual const char *symbol_name_at (offset_type idx) const
4963 return m_symbol_table[idx];
4967 gdb::array_view<const char *> m_symbol_table;
4970 /* Convenience function that converts a NULL pointer to a "<null>"
4971 string, to pass to print routines. */
4974 string_or_null (const char *str)
4976 return str != NULL ? str : "<null>";
4979 /* Check if a lookup_name_info built from
4980 NAME/MATCH_TYPE/COMPLETION_MODE matches the symbols in the mock
4981 index. EXPECTED_LIST is the list of expected matches, in expected
4982 matching order. If no match expected, then an empty list is
4983 specified. Returns true on success. On failure prints a warning
4984 indicating the file:line that failed, and returns false. */
4987 check_match (const char *file, int line,
4988 mock_mapped_index &mock_index,
4989 const char *name, symbol_name_match_type match_type,
4990 bool completion_mode,
4991 std::initializer_list<const char *> expected_list)
4993 lookup_name_info lookup_name (name, match_type, completion_mode);
4995 bool matched = true;
4997 auto mismatch = [&] (const char *expected_str,
5000 warning (_("%s:%d: match_type=%s, looking-for=\"%s\", "
5001 "expected=\"%s\", got=\"%s\"\n"),
5003 (match_type == symbol_name_match_type::FULL
5005 name, string_or_null (expected_str), string_or_null (got));
5009 auto expected_it = expected_list.begin ();
5010 auto expected_end = expected_list.end ();
5012 dw2_expand_symtabs_matching_symbol (mock_index, lookup_name,
5014 [&] (offset_type idx)
5016 const char *matched_name = mock_index.symbol_name_at (idx);
5017 const char *expected_str
5018 = expected_it == expected_end ? NULL : *expected_it++;
5020 if (expected_str == NULL || strcmp (expected_str, matched_name) != 0)
5021 mismatch (expected_str, matched_name);
5024 const char *expected_str
5025 = expected_it == expected_end ? NULL : *expected_it++;
5026 if (expected_str != NULL)
5027 mismatch (expected_str, NULL);
5032 /* The symbols added to the mock mapped_index for testing (in
5034 static const char *test_symbols[] = {
5043 "ns2::tmpl<int>::foo2",
5044 "(anonymous namespace)::A::B::C",
5046 /* These are used to check that the increment-last-char in the
5047 matching algorithm for completion doesn't match "t1_fund" when
5048 completing "t1_func". */
5054 /* A UTF-8 name with multi-byte sequences to make sure that
5055 cp-name-parser understands this as a single identifier ("função"
5056 is "function" in PT). */
5059 /* \377 (0xff) is Latin1 'ÿ'. */
5062 /* \377 (0xff) is Latin1 'ÿ'. */
5066 /* A name with all sorts of complications. Starts with "z" to make
5067 it easier for the completion tests below. */
5068 #define Z_SYM_NAME \
5069 "z::std::tuple<(anonymous namespace)::ui*, std::bar<(anonymous namespace)::ui> >" \
5070 "::tuple<(anonymous namespace)::ui*, " \
5071 "std::default_delete<(anonymous namespace)::ui>, void>"
5076 /* Returns true if the mapped_index_base::find_name_component_bounds
5077 method finds EXPECTED_SYMS in INDEX when looking for SEARCH_NAME,
5078 in completion mode. */
5081 check_find_bounds_finds (mapped_index_base &index,
5082 const char *search_name,
5083 gdb::array_view<const char *> expected_syms)
5085 lookup_name_info lookup_name (search_name,
5086 symbol_name_match_type::FULL, true);
5088 auto bounds = index.find_name_components_bounds (lookup_name);
5090 size_t distance = std::distance (bounds.first, bounds.second);
5091 if (distance != expected_syms.size ())
5094 for (size_t exp_elem = 0; exp_elem < distance; exp_elem++)
5096 auto nc_elem = bounds.first + exp_elem;
5097 const char *qualified = index.symbol_name_at (nc_elem->idx);
5098 if (strcmp (qualified, expected_syms[exp_elem]) != 0)
5105 /* Test the lower-level mapped_index::find_name_component_bounds
5109 test_mapped_index_find_name_component_bounds ()
5111 mock_mapped_index mock_index (test_symbols);
5113 mock_index.build_name_components ();
5115 /* Test the lower-level mapped_index::find_name_component_bounds
5116 method in completion mode. */
5118 static const char *expected_syms[] = {
5123 SELF_CHECK (check_find_bounds_finds (mock_index,
5124 "t1_func", expected_syms));
5127 /* Check that the increment-last-char in the name matching algorithm
5128 for completion doesn't get confused with Ansi1 'ÿ' / 0xff. */
5130 static const char *expected_syms1[] = {
5134 SELF_CHECK (check_find_bounds_finds (mock_index,
5135 "\377", expected_syms1));
5137 static const char *expected_syms2[] = {
5140 SELF_CHECK (check_find_bounds_finds (mock_index,
5141 "\377\377", expected_syms2));
5145 /* Test dw2_expand_symtabs_matching_symbol. */
5148 test_dw2_expand_symtabs_matching_symbol ()
5150 mock_mapped_index mock_index (test_symbols);
5152 /* We let all tests run until the end even if some fails, for debug
5154 bool any_mismatch = false;
5156 /* Create the expected symbols list (an initializer_list). Needed
5157 because lists have commas, and we need to pass them to CHECK,
5158 which is a macro. */
5159 #define EXPECT(...) { __VA_ARGS__ }
5161 /* Wrapper for check_match that passes down the current
5162 __FILE__/__LINE__. */
5163 #define CHECK_MATCH(NAME, MATCH_TYPE, COMPLETION_MODE, EXPECTED_LIST) \
5164 any_mismatch |= !check_match (__FILE__, __LINE__, \
5166 NAME, MATCH_TYPE, COMPLETION_MODE, \
5169 /* Identity checks. */
5170 for (const char *sym : test_symbols)
5172 /* Should be able to match all existing symbols. */
5173 CHECK_MATCH (sym, symbol_name_match_type::FULL, false,
5176 /* Should be able to match all existing symbols with
5178 std::string with_params = std::string (sym) + "(int)";
5179 CHECK_MATCH (with_params.c_str (), symbol_name_match_type::FULL, false,
5182 /* Should be able to match all existing symbols with
5183 parameters and qualifiers. */
5184 with_params = std::string (sym) + " ( int ) const";
5185 CHECK_MATCH (with_params.c_str (), symbol_name_match_type::FULL, false,
5188 /* This should really find sym, but cp-name-parser.y doesn't
5189 know about lvalue/rvalue qualifiers yet. */
5190 with_params = std::string (sym) + " ( int ) &&";
5191 CHECK_MATCH (with_params.c_str (), symbol_name_match_type::FULL, false,
5195 /* Check that the name matching algorithm for completion doesn't get
5196 confused with Latin1 'ÿ' / 0xff. */
5198 static const char str[] = "\377";
5199 CHECK_MATCH (str, symbol_name_match_type::FULL, true,
5200 EXPECT ("\377", "\377\377123"));
5203 /* Check that the increment-last-char in the matching algorithm for
5204 completion doesn't match "t1_fund" when completing "t1_func". */
5206 static const char str[] = "t1_func";
5207 CHECK_MATCH (str, symbol_name_match_type::FULL, true,
5208 EXPECT ("t1_func", "t1_func1"));
5211 /* Check that completion mode works at each prefix of the expected
5214 static const char str[] = "function(int)";
5215 size_t len = strlen (str);
5218 for (size_t i = 1; i < len; i++)
5220 lookup.assign (str, i);
5221 CHECK_MATCH (lookup.c_str (), symbol_name_match_type::FULL, true,
5222 EXPECT ("function"));
5226 /* While "w" is a prefix of both components, the match function
5227 should still only be called once. */
5229 CHECK_MATCH ("w", symbol_name_match_type::FULL, true,
5231 CHECK_MATCH ("w", symbol_name_match_type::WILD, true,
5235 /* Same, with a "complicated" symbol. */
5237 static const char str[] = Z_SYM_NAME;
5238 size_t len = strlen (str);
5241 for (size_t i = 1; i < len; i++)
5243 lookup.assign (str, i);
5244 CHECK_MATCH (lookup.c_str (), symbol_name_match_type::FULL, true,
5245 EXPECT (Z_SYM_NAME));
5249 /* In FULL mode, an incomplete symbol doesn't match. */
5251 CHECK_MATCH ("std::zfunction(int", symbol_name_match_type::FULL, false,
5255 /* A complete symbol with parameters matches any overload, since the
5256 index has no overload info. */
5258 CHECK_MATCH ("std::zfunction(int)", symbol_name_match_type::FULL, true,
5259 EXPECT ("std::zfunction", "std::zfunction2"));
5260 CHECK_MATCH ("zfunction(int)", symbol_name_match_type::WILD, true,
5261 EXPECT ("std::zfunction", "std::zfunction2"));
5262 CHECK_MATCH ("zfunc", symbol_name_match_type::WILD, true,
5263 EXPECT ("std::zfunction", "std::zfunction2"));
5266 /* Check that whitespace is ignored appropriately. A symbol with a
5267 template argument list. */
5269 static const char expected[] = "ns::foo<int>";
5270 CHECK_MATCH ("ns :: foo < int > ", symbol_name_match_type::FULL, false,
5272 CHECK_MATCH ("foo < int > ", symbol_name_match_type::WILD, false,
5276 /* Check that whitespace is ignored appropriately. A symbol with a
5277 template argument list that includes a pointer. */
5279 static const char expected[] = "ns::foo<char*>";
5280 /* Try both completion and non-completion modes. */
5281 static const bool completion_mode[2] = {false, true};
5282 for (size_t i = 0; i < 2; i++)
5284 CHECK_MATCH ("ns :: foo < char * >", symbol_name_match_type::FULL,
5285 completion_mode[i], EXPECT (expected));
5286 CHECK_MATCH ("foo < char * >", symbol_name_match_type::WILD,
5287 completion_mode[i], EXPECT (expected));
5289 CHECK_MATCH ("ns :: foo < char * > (int)", symbol_name_match_type::FULL,
5290 completion_mode[i], EXPECT (expected));
5291 CHECK_MATCH ("foo < char * > (int)", symbol_name_match_type::WILD,
5292 completion_mode[i], EXPECT (expected));
5297 /* Check method qualifiers are ignored. */
5298 static const char expected[] = "ns::foo<char*>";
5299 CHECK_MATCH ("ns :: foo < char * > ( int ) const",
5300 symbol_name_match_type::FULL, true, EXPECT (expected));
5301 CHECK_MATCH ("ns :: foo < char * > ( int ) &&",
5302 symbol_name_match_type::FULL, true, EXPECT (expected));
5303 CHECK_MATCH ("foo < char * > ( int ) const",
5304 symbol_name_match_type::WILD, true, EXPECT (expected));
5305 CHECK_MATCH ("foo < char * > ( int ) &&",
5306 symbol_name_match_type::WILD, true, EXPECT (expected));
5309 /* Test lookup names that don't match anything. */
5311 CHECK_MATCH ("bar2", symbol_name_match_type::WILD, false,
5314 CHECK_MATCH ("doesntexist", symbol_name_match_type::FULL, false,
5318 /* Some wild matching tests, exercising "(anonymous namespace)",
5319 which should not be confused with a parameter list. */
5321 static const char *syms[] = {
5325 "A :: B :: C ( int )",
5330 for (const char *s : syms)
5332 CHECK_MATCH (s, symbol_name_match_type::WILD, false,
5333 EXPECT ("(anonymous namespace)::A::B::C"));
5338 static const char expected[] = "ns2::tmpl<int>::foo2";
5339 CHECK_MATCH ("tmp", symbol_name_match_type::WILD, true,
5341 CHECK_MATCH ("tmpl<", symbol_name_match_type::WILD, true,
5345 SELF_CHECK (!any_mismatch);
5354 test_mapped_index_find_name_component_bounds ();
5355 test_dw2_expand_symtabs_matching_symbol ();
5358 }} // namespace selftests::dw2_expand_symtabs_matching
5360 #endif /* GDB_SELF_TEST */
5362 /* If FILE_MATCHER is NULL or if PER_CU has
5363 dwarf2_per_cu_quick_data::MARK set (see
5364 dw_expand_symtabs_matching_file_matcher), expand the CU and call
5365 EXPANSION_NOTIFY on it. */
5368 dw2_expand_symtabs_matching_one
5369 (struct dwarf2_per_cu_data *per_cu,
5370 gdb::function_view<expand_symtabs_file_matcher_ftype> file_matcher,
5371 gdb::function_view<expand_symtabs_exp_notify_ftype> expansion_notify)
5373 if (file_matcher == NULL || per_cu->v.quick->mark)
5375 bool symtab_was_null
5376 = (per_cu->v.quick->compunit_symtab == NULL);
5378 dw2_instantiate_symtab (per_cu);
5380 if (expansion_notify != NULL
5382 && per_cu->v.quick->compunit_symtab != NULL)
5383 expansion_notify (per_cu->v.quick->compunit_symtab);
5387 /* Helper for dw2_expand_matching symtabs. Called on each symbol
5388 matched, to expand corresponding CUs that were marked. IDX is the
5389 index of the symbol name that matched. */
5392 dw2_expand_marked_cus
5393 (struct dwarf2_per_objfile *dwarf2_per_objfile, offset_type idx,
5394 gdb::function_view<expand_symtabs_file_matcher_ftype> file_matcher,
5395 gdb::function_view<expand_symtabs_exp_notify_ftype> expansion_notify,
5398 offset_type *vec, vec_len, vec_idx;
5399 bool global_seen = false;
5400 mapped_index &index = *dwarf2_per_objfile->index_table;
5402 vec = (offset_type *) (index.constant_pool
5403 + MAYBE_SWAP (index.symbol_table[idx].vec));
5404 vec_len = MAYBE_SWAP (vec[0]);
5405 for (vec_idx = 0; vec_idx < vec_len; ++vec_idx)
5407 struct dwarf2_per_cu_data *per_cu;
5408 offset_type cu_index_and_attrs = MAYBE_SWAP (vec[vec_idx + 1]);
5409 /* This value is only valid for index versions >= 7. */
5410 int is_static = GDB_INDEX_SYMBOL_STATIC_VALUE (cu_index_and_attrs);
5411 gdb_index_symbol_kind symbol_kind =
5412 GDB_INDEX_SYMBOL_KIND_VALUE (cu_index_and_attrs);
5413 int cu_index = GDB_INDEX_CU_VALUE (cu_index_and_attrs);
5414 /* Only check the symbol attributes if they're present.
5415 Indices prior to version 7 don't record them,
5416 and indices >= 7 may elide them for certain symbols
5417 (gold does this). */
5420 && symbol_kind != GDB_INDEX_SYMBOL_KIND_NONE);
5422 /* Work around gold/15646. */
5425 if (!is_static && global_seen)
5431 /* Only check the symbol's kind if it has one. */
5436 case VARIABLES_DOMAIN:
5437 if (symbol_kind != GDB_INDEX_SYMBOL_KIND_VARIABLE)
5440 case FUNCTIONS_DOMAIN:
5441 if (symbol_kind != GDB_INDEX_SYMBOL_KIND_FUNCTION)
5445 if (symbol_kind != GDB_INDEX_SYMBOL_KIND_TYPE)
5453 /* Don't crash on bad data. */
5454 if (cu_index >= (dwarf2_per_objfile->n_comp_units
5455 + dwarf2_per_objfile->n_type_units))
5457 complaint (&symfile_complaints,
5458 _(".gdb_index entry has bad CU index"
5460 objfile_name (dwarf2_per_objfile->objfile));
5464 per_cu = dw2_get_cutu (dwarf2_per_objfile, cu_index);
5465 dw2_expand_symtabs_matching_one (per_cu, file_matcher,
5470 /* If FILE_MATCHER is non-NULL, set all the
5471 dwarf2_per_cu_quick_data::MARK of the current DWARF2_PER_OBJFILE
5472 that match FILE_MATCHER. */
5475 dw_expand_symtabs_matching_file_matcher
5476 (struct dwarf2_per_objfile *dwarf2_per_objfile,
5477 gdb::function_view<expand_symtabs_file_matcher_ftype> file_matcher)
5479 if (file_matcher == NULL)
5482 objfile *const objfile = dwarf2_per_objfile->objfile;
5484 htab_up visited_found (htab_create_alloc (10, htab_hash_pointer,
5486 NULL, xcalloc, xfree));
5487 htab_up visited_not_found (htab_create_alloc (10, htab_hash_pointer,
5489 NULL, xcalloc, xfree));
5491 /* The rule is CUs specify all the files, including those used by
5492 any TU, so there's no need to scan TUs here. */
5494 for (int i = 0; i < dwarf2_per_objfile->n_comp_units; ++i)
5497 struct dwarf2_per_cu_data *per_cu = dw2_get_cu (dwarf2_per_objfile, i);
5498 struct quick_file_names *file_data;
5503 per_cu->v.quick->mark = 0;
5505 /* We only need to look at symtabs not already expanded. */
5506 if (per_cu->v.quick->compunit_symtab)
5509 file_data = dw2_get_file_names (per_cu);
5510 if (file_data == NULL)
5513 if (htab_find (visited_not_found.get (), file_data) != NULL)
5515 else if (htab_find (visited_found.get (), file_data) != NULL)
5517 per_cu->v.quick->mark = 1;
5521 for (j = 0; j < file_data->num_file_names; ++j)
5523 const char *this_real_name;
5525 if (file_matcher (file_data->file_names[j], false))
5527 per_cu->v.quick->mark = 1;
5531 /* Before we invoke realpath, which can get expensive when many
5532 files are involved, do a quick comparison of the basenames. */
5533 if (!basenames_may_differ
5534 && !file_matcher (lbasename (file_data->file_names[j]),
5538 this_real_name = dw2_get_real_path (objfile, file_data, j);
5539 if (file_matcher (this_real_name, false))
5541 per_cu->v.quick->mark = 1;
5546 slot = htab_find_slot (per_cu->v.quick->mark
5547 ? visited_found.get ()
5548 : visited_not_found.get (),
5555 dw2_expand_symtabs_matching
5556 (struct objfile *objfile,
5557 gdb::function_view<expand_symtabs_file_matcher_ftype> file_matcher,
5558 const lookup_name_info &lookup_name,
5559 gdb::function_view<expand_symtabs_symbol_matcher_ftype> symbol_matcher,
5560 gdb::function_view<expand_symtabs_exp_notify_ftype> expansion_notify,
5561 enum search_domain kind)
5563 struct dwarf2_per_objfile *dwarf2_per_objfile
5564 = get_dwarf2_per_objfile (objfile);
5566 /* index_table is NULL if OBJF_READNOW. */
5567 if (!dwarf2_per_objfile->index_table)
5570 dw_expand_symtabs_matching_file_matcher (dwarf2_per_objfile, file_matcher);
5572 mapped_index &index = *dwarf2_per_objfile->index_table;
5574 dw2_expand_symtabs_matching_symbol (index, lookup_name,
5576 kind, [&] (offset_type idx)
5578 dw2_expand_marked_cus (dwarf2_per_objfile, idx, file_matcher,
5579 expansion_notify, kind);
5583 /* A helper for dw2_find_pc_sect_compunit_symtab which finds the most specific
5586 static struct compunit_symtab *
5587 recursively_find_pc_sect_compunit_symtab (struct compunit_symtab *cust,
5592 if (COMPUNIT_BLOCKVECTOR (cust) != NULL
5593 && blockvector_contains_pc (COMPUNIT_BLOCKVECTOR (cust), pc))
5596 if (cust->includes == NULL)
5599 for (i = 0; cust->includes[i]; ++i)
5601 struct compunit_symtab *s = cust->includes[i];
5603 s = recursively_find_pc_sect_compunit_symtab (s, pc);
5611 static struct compunit_symtab *
5612 dw2_find_pc_sect_compunit_symtab (struct objfile *objfile,
5613 struct bound_minimal_symbol msymbol,
5615 struct obj_section *section,
5618 struct dwarf2_per_cu_data *data;
5619 struct compunit_symtab *result;
5621 if (!objfile->psymtabs_addrmap)
5624 data = (struct dwarf2_per_cu_data *) addrmap_find (objfile->psymtabs_addrmap,
5629 if (warn_if_readin && data->v.quick->compunit_symtab)
5630 warning (_("(Internal error: pc %s in read in CU, but not in symtab.)"),
5631 paddress (get_objfile_arch (objfile), pc));
5634 = recursively_find_pc_sect_compunit_symtab (dw2_instantiate_symtab (data),
5636 gdb_assert (result != NULL);
5641 dw2_map_symbol_filenames (struct objfile *objfile, symbol_filename_ftype *fun,
5642 void *data, int need_fullname)
5644 struct dwarf2_per_objfile *dwarf2_per_objfile
5645 = get_dwarf2_per_objfile (objfile);
5647 if (!dwarf2_per_objfile->filenames_cache)
5649 dwarf2_per_objfile->filenames_cache.emplace ();
5651 htab_up visited (htab_create_alloc (10,
5652 htab_hash_pointer, htab_eq_pointer,
5653 NULL, xcalloc, xfree));
5655 /* The rule is CUs specify all the files, including those used
5656 by any TU, so there's no need to scan TUs here. We can
5657 ignore file names coming from already-expanded CUs. */
5659 for (int i = 0; i < dwarf2_per_objfile->n_comp_units; ++i)
5661 dwarf2_per_cu_data *per_cu = dw2_get_cutu (dwarf2_per_objfile, i);
5663 if (per_cu->v.quick->compunit_symtab)
5665 void **slot = htab_find_slot (visited.get (),
5666 per_cu->v.quick->file_names,
5669 *slot = per_cu->v.quick->file_names;
5673 for (int i = 0; i < dwarf2_per_objfile->n_comp_units; ++i)
5675 dwarf2_per_cu_data *per_cu = dw2_get_cu (dwarf2_per_objfile, i);
5676 struct quick_file_names *file_data;
5679 /* We only need to look at symtabs not already expanded. */
5680 if (per_cu->v.quick->compunit_symtab)
5683 file_data = dw2_get_file_names (per_cu);
5684 if (file_data == NULL)
5687 slot = htab_find_slot (visited.get (), file_data, INSERT);
5690 /* Already visited. */
5695 for (int j = 0; j < file_data->num_file_names; ++j)
5697 const char *filename = file_data->file_names[j];
5698 dwarf2_per_objfile->filenames_cache->seen (filename);
5703 dwarf2_per_objfile->filenames_cache->traverse ([&] (const char *filename)
5705 gdb::unique_xmalloc_ptr<char> this_real_name;
5708 this_real_name = gdb_realpath (filename);
5709 (*fun) (filename, this_real_name.get (), data);
5714 dw2_has_symbols (struct objfile *objfile)
5719 const struct quick_symbol_functions dwarf2_gdb_index_functions =
5722 dw2_find_last_source_symtab,
5723 dw2_forget_cached_source_info,
5724 dw2_map_symtabs_matching_filename,
5729 dw2_expand_symtabs_for_function,
5730 dw2_expand_all_symtabs,
5731 dw2_expand_symtabs_with_fullname,
5732 dw2_map_matching_symbols,
5733 dw2_expand_symtabs_matching,
5734 dw2_find_pc_sect_compunit_symtab,
5736 dw2_map_symbol_filenames
5739 /* DWARF-5 debug_names reader. */
5741 /* DWARF-5 augmentation string for GDB's DW_IDX_GNU_* extension. */
5742 static const gdb_byte dwarf5_augmentation[] = { 'G', 'D', 'B', 0 };
5744 /* A helper function that reads the .debug_names section in SECTION
5745 and fills in MAP. FILENAME is the name of the file containing the
5746 section; it is used for error reporting.
5748 Returns true if all went well, false otherwise. */
5751 read_debug_names_from_section (struct objfile *objfile,
5752 const char *filename,
5753 struct dwarf2_section_info *section,
5754 mapped_debug_names &map)
5756 if (dwarf2_section_empty_p (section))
5759 /* Older elfutils strip versions could keep the section in the main
5760 executable while splitting it for the separate debug info file. */
5761 if ((get_section_flags (section) & SEC_HAS_CONTENTS) == 0)
5764 dwarf2_read_section (objfile, section);
5766 map.dwarf5_byte_order = gdbarch_byte_order (get_objfile_arch (objfile));
5768 const gdb_byte *addr = section->buffer;
5770 bfd *const abfd = get_section_bfd_owner (section);
5772 unsigned int bytes_read;
5773 LONGEST length = read_initial_length (abfd, addr, &bytes_read);
5776 map.dwarf5_is_dwarf64 = bytes_read != 4;
5777 map.offset_size = map.dwarf5_is_dwarf64 ? 8 : 4;
5778 if (bytes_read + length != section->size)
5780 /* There may be multiple per-CU indices. */
5781 warning (_("Section .debug_names in %s length %s does not match "
5782 "section length %s, ignoring .debug_names."),
5783 filename, plongest (bytes_read + length),
5784 pulongest (section->size));
5788 /* The version number. */
5789 uint16_t version = read_2_bytes (abfd, addr);
5793 warning (_("Section .debug_names in %s has unsupported version %d, "
5794 "ignoring .debug_names."),
5800 uint16_t padding = read_2_bytes (abfd, addr);
5804 warning (_("Section .debug_names in %s has unsupported padding %d, "
5805 "ignoring .debug_names."),
5810 /* comp_unit_count - The number of CUs in the CU list. */
5811 map.cu_count = read_4_bytes (abfd, addr);
5814 /* local_type_unit_count - The number of TUs in the local TU
5816 map.tu_count = read_4_bytes (abfd, addr);
5819 /* foreign_type_unit_count - The number of TUs in the foreign TU
5821 uint32_t foreign_tu_count = read_4_bytes (abfd, addr);
5823 if (foreign_tu_count != 0)
5825 warning (_("Section .debug_names in %s has unsupported %lu foreign TUs, "
5826 "ignoring .debug_names."),
5827 filename, static_cast<unsigned long> (foreign_tu_count));
5831 /* bucket_count - The number of hash buckets in the hash lookup
5833 map.bucket_count = read_4_bytes (abfd, addr);
5836 /* name_count - The number of unique names in the index. */
5837 map.name_count = read_4_bytes (abfd, addr);
5840 /* abbrev_table_size - The size in bytes of the abbreviations
5842 uint32_t abbrev_table_size = read_4_bytes (abfd, addr);
5845 /* augmentation_string_size - The size in bytes of the augmentation
5846 string. This value is rounded up to a multiple of 4. */
5847 uint32_t augmentation_string_size = read_4_bytes (abfd, addr);
5849 map.augmentation_is_gdb = ((augmentation_string_size
5850 == sizeof (dwarf5_augmentation))
5851 && memcmp (addr, dwarf5_augmentation,
5852 sizeof (dwarf5_augmentation)) == 0);
5853 augmentation_string_size += (-augmentation_string_size) & 3;
5854 addr += augmentation_string_size;
5857 map.cu_table_reordered = addr;
5858 addr += map.cu_count * map.offset_size;
5860 /* List of Local TUs */
5861 map.tu_table_reordered = addr;
5862 addr += map.tu_count * map.offset_size;
5864 /* Hash Lookup Table */
5865 map.bucket_table_reordered = reinterpret_cast<const uint32_t *> (addr);
5866 addr += map.bucket_count * 4;
5867 map.hash_table_reordered = reinterpret_cast<const uint32_t *> (addr);
5868 addr += map.name_count * 4;
5871 map.name_table_string_offs_reordered = addr;
5872 addr += map.name_count * map.offset_size;
5873 map.name_table_entry_offs_reordered = addr;
5874 addr += map.name_count * map.offset_size;
5876 const gdb_byte *abbrev_table_start = addr;
5879 unsigned int bytes_read;
5880 const ULONGEST index_num = read_unsigned_leb128 (abfd, addr, &bytes_read);
5885 const auto insertpair
5886 = map.abbrev_map.emplace (index_num, mapped_debug_names::index_val ());
5887 if (!insertpair.second)
5889 warning (_("Section .debug_names in %s has duplicate index %s, "
5890 "ignoring .debug_names."),
5891 filename, pulongest (index_num));
5894 mapped_debug_names::index_val &indexval = insertpair.first->second;
5895 indexval.dwarf_tag = read_unsigned_leb128 (abfd, addr, &bytes_read);
5900 mapped_debug_names::index_val::attr attr;
5901 attr.dw_idx = read_unsigned_leb128 (abfd, addr, &bytes_read);
5903 attr.form = read_unsigned_leb128 (abfd, addr, &bytes_read);
5905 if (attr.form == DW_FORM_implicit_const)
5907 attr.implicit_const = read_signed_leb128 (abfd, addr,
5911 if (attr.dw_idx == 0 && attr.form == 0)
5913 indexval.attr_vec.push_back (std::move (attr));
5916 if (addr != abbrev_table_start + abbrev_table_size)
5918 warning (_("Section .debug_names in %s has abbreviation_table "
5919 "of size %zu vs. written as %u, ignoring .debug_names."),
5920 filename, addr - abbrev_table_start, abbrev_table_size);
5923 map.entry_pool = addr;
5928 /* A helper for create_cus_from_debug_names that handles the MAP's CU
5932 create_cus_from_debug_names_list (struct dwarf2_per_objfile *dwarf2_per_objfile,
5933 const mapped_debug_names &map,
5934 dwarf2_section_info §ion,
5935 bool is_dwz, int base_offset)
5937 sect_offset sect_off_prev;
5938 for (uint32_t i = 0; i <= map.cu_count; ++i)
5940 sect_offset sect_off_next;
5941 if (i < map.cu_count)
5944 = (sect_offset) (extract_unsigned_integer
5945 (map.cu_table_reordered + i * map.offset_size,
5947 map.dwarf5_byte_order));
5950 sect_off_next = (sect_offset) section.size;
5953 const ULONGEST length = sect_off_next - sect_off_prev;
5954 dwarf2_per_objfile->all_comp_units[base_offset + (i - 1)]
5955 = create_cu_from_index_list (dwarf2_per_objfile, §ion, is_dwz,
5956 sect_off_prev, length);
5958 sect_off_prev = sect_off_next;
5962 /* Read the CU list from the mapped index, and use it to create all
5963 the CU objects for this dwarf2_per_objfile. */
5966 create_cus_from_debug_names (struct dwarf2_per_objfile *dwarf2_per_objfile,
5967 const mapped_debug_names &map,
5968 const mapped_debug_names &dwz_map)
5970 struct objfile *objfile = dwarf2_per_objfile->objfile;
5972 dwarf2_per_objfile->n_comp_units = map.cu_count + dwz_map.cu_count;
5973 dwarf2_per_objfile->all_comp_units
5974 = XOBNEWVEC (&objfile->objfile_obstack, struct dwarf2_per_cu_data *,
5975 dwarf2_per_objfile->n_comp_units);
5977 create_cus_from_debug_names_list (dwarf2_per_objfile, map,
5978 dwarf2_per_objfile->info,
5980 0 /* base_offset */);
5982 if (dwz_map.cu_count == 0)
5985 dwz_file *dwz = dwarf2_get_dwz_file (dwarf2_per_objfile);
5986 create_cus_from_debug_names_list (dwarf2_per_objfile, dwz_map, dwz->info,
5988 map.cu_count /* base_offset */);
5991 /* Read .debug_names. If everything went ok, initialize the "quick"
5992 elements of all the CUs and return true. Otherwise, return false. */
5995 dwarf2_read_debug_names (struct dwarf2_per_objfile *dwarf2_per_objfile)
5997 mapped_debug_names local_map (dwarf2_per_objfile);
5998 mapped_debug_names dwz_map (dwarf2_per_objfile);
5999 struct objfile *objfile = dwarf2_per_objfile->objfile;
6001 if (!read_debug_names_from_section (objfile, objfile_name (objfile),
6002 &dwarf2_per_objfile->debug_names,
6006 /* Don't use the index if it's empty. */
6007 if (local_map.name_count == 0)
6010 /* If there is a .dwz file, read it so we can get its CU list as
6012 dwz_file *dwz = dwarf2_get_dwz_file (dwarf2_per_objfile);
6015 if (!read_debug_names_from_section (objfile,
6016 bfd_get_filename (dwz->dwz_bfd),
6017 &dwz->debug_names, dwz_map))
6019 warning (_("could not read '.debug_names' section from %s; skipping"),
6020 bfd_get_filename (dwz->dwz_bfd));
6025 create_cus_from_debug_names (dwarf2_per_objfile, local_map, dwz_map);
6027 if (local_map.tu_count != 0)
6029 /* We can only handle a single .debug_types when we have an
6031 if (VEC_length (dwarf2_section_info_def, dwarf2_per_objfile->types) != 1)
6034 dwarf2_section_info *section = VEC_index (dwarf2_section_info_def,
6035 dwarf2_per_objfile->types, 0);
6037 create_signatured_type_table_from_debug_names
6038 (dwarf2_per_objfile, local_map, section, &dwarf2_per_objfile->abbrev);
6041 create_addrmap_from_aranges (dwarf2_per_objfile,
6042 &dwarf2_per_objfile->debug_aranges);
6044 dwarf2_per_objfile->debug_names_table.reset
6045 (new mapped_debug_names (dwarf2_per_objfile));
6046 *dwarf2_per_objfile->debug_names_table = std::move (local_map);
6047 dwarf2_per_objfile->using_index = 1;
6048 dwarf2_per_objfile->quick_file_names_table =
6049 create_quick_file_names_table (dwarf2_per_objfile->n_comp_units);
6054 /* Symbol name hashing function as specified by DWARF-5. */
6057 dwarf5_djb_hash (const char *str_)
6059 const unsigned char *str = (const unsigned char *) str_;
6061 /* Note: tolower here ignores UTF-8, which isn't fully compliant.
6062 See http://dwarfstd.org/ShowIssue.php?issue=161027.1. */
6064 uint32_t hash = 5381;
6065 while (int c = *str++)
6066 hash = hash * 33 + tolower (c);
6070 /* Type used to manage iterating over all CUs looking for a symbol for
6073 class dw2_debug_names_iterator
6076 /* If WANT_SPECIFIC_BLOCK is true, only look for symbols in block
6077 BLOCK_INDEX. Otherwise BLOCK_INDEX is ignored. */
6078 dw2_debug_names_iterator (const mapped_debug_names &map,
6079 bool want_specific_block,
6080 block_enum block_index, domain_enum domain,
6082 : m_map (map), m_want_specific_block (want_specific_block),
6083 m_block_index (block_index), m_domain (domain),
6084 m_addr (find_vec_in_debug_names (map, name))
6087 dw2_debug_names_iterator (const mapped_debug_names &map,
6088 search_domain search, uint32_t namei)
6091 m_addr (find_vec_in_debug_names (map, namei))
6094 /* Return the next matching CU or NULL if there are no more. */
6095 dwarf2_per_cu_data *next ();
6098 static const gdb_byte *find_vec_in_debug_names (const mapped_debug_names &map,
6100 static const gdb_byte *find_vec_in_debug_names (const mapped_debug_names &map,
6103 /* The internalized form of .debug_names. */
6104 const mapped_debug_names &m_map;
6106 /* If true, only look for symbols that match BLOCK_INDEX. */
6107 const bool m_want_specific_block = false;
6109 /* One of GLOBAL_BLOCK or STATIC_BLOCK.
6110 Unused if !WANT_SPECIFIC_BLOCK - FIRST_LOCAL_BLOCK is an invalid
6112 const block_enum m_block_index = FIRST_LOCAL_BLOCK;
6114 /* The kind of symbol we're looking for. */
6115 const domain_enum m_domain = UNDEF_DOMAIN;
6116 const search_domain m_search = ALL_DOMAIN;
6118 /* The list of CUs from the index entry of the symbol, or NULL if
6120 const gdb_byte *m_addr;
6124 mapped_debug_names::namei_to_name (uint32_t namei) const
6126 const ULONGEST namei_string_offs
6127 = extract_unsigned_integer ((name_table_string_offs_reordered
6128 + namei * offset_size),
6131 return read_indirect_string_at_offset
6132 (dwarf2_per_objfile, dwarf2_per_objfile->objfile->obfd, namei_string_offs);
6135 /* Find a slot in .debug_names for the object named NAME. If NAME is
6136 found, return pointer to its pool data. If NAME cannot be found,
6140 dw2_debug_names_iterator::find_vec_in_debug_names
6141 (const mapped_debug_names &map, const char *name)
6143 int (*cmp) (const char *, const char *);
6145 if (current_language->la_language == language_cplus
6146 || current_language->la_language == language_fortran
6147 || current_language->la_language == language_d)
6149 /* NAME is already canonical. Drop any qualifiers as
6150 .debug_names does not contain any. */
6152 if (strchr (name, '(') != NULL)
6154 gdb::unique_xmalloc_ptr<char> without_params
6155 = cp_remove_params (name);
6157 if (without_params != NULL)
6159 name = without_params.get();
6164 cmp = (case_sensitivity == case_sensitive_on ? strcmp : strcasecmp);
6166 const uint32_t full_hash = dwarf5_djb_hash (name);
6168 = extract_unsigned_integer (reinterpret_cast<const gdb_byte *>
6169 (map.bucket_table_reordered
6170 + (full_hash % map.bucket_count)), 4,
6171 map.dwarf5_byte_order);
6175 if (namei >= map.name_count)
6177 complaint (&symfile_complaints,
6178 _("Wrong .debug_names with name index %u but name_count=%u "
6180 namei, map.name_count,
6181 objfile_name (map.dwarf2_per_objfile->objfile));
6187 const uint32_t namei_full_hash
6188 = extract_unsigned_integer (reinterpret_cast<const gdb_byte *>
6189 (map.hash_table_reordered + namei), 4,
6190 map.dwarf5_byte_order);
6191 if (full_hash % map.bucket_count != namei_full_hash % map.bucket_count)
6194 if (full_hash == namei_full_hash)
6196 const char *const namei_string = map.namei_to_name (namei);
6198 #if 0 /* An expensive sanity check. */
6199 if (namei_full_hash != dwarf5_djb_hash (namei_string))
6201 complaint (&symfile_complaints,
6202 _("Wrong .debug_names hash for string at index %u "
6204 namei, objfile_name (dwarf2_per_objfile->objfile));
6209 if (cmp (namei_string, name) == 0)
6211 const ULONGEST namei_entry_offs
6212 = extract_unsigned_integer ((map.name_table_entry_offs_reordered
6213 + namei * map.offset_size),
6214 map.offset_size, map.dwarf5_byte_order);
6215 return map.entry_pool + namei_entry_offs;
6220 if (namei >= map.name_count)
6226 dw2_debug_names_iterator::find_vec_in_debug_names
6227 (const mapped_debug_names &map, uint32_t namei)
6229 if (namei >= map.name_count)
6231 complaint (&symfile_complaints,
6232 _("Wrong .debug_names with name index %u but name_count=%u "
6234 namei, map.name_count,
6235 objfile_name (map.dwarf2_per_objfile->objfile));
6239 const ULONGEST namei_entry_offs
6240 = extract_unsigned_integer ((map.name_table_entry_offs_reordered
6241 + namei * map.offset_size),
6242 map.offset_size, map.dwarf5_byte_order);
6243 return map.entry_pool + namei_entry_offs;
6246 /* See dw2_debug_names_iterator. */
6248 dwarf2_per_cu_data *
6249 dw2_debug_names_iterator::next ()
6254 struct dwarf2_per_objfile *dwarf2_per_objfile = m_map.dwarf2_per_objfile;
6255 struct objfile *objfile = dwarf2_per_objfile->objfile;
6256 bfd *const abfd = objfile->obfd;
6260 unsigned int bytes_read;
6261 const ULONGEST abbrev = read_unsigned_leb128 (abfd, m_addr, &bytes_read);
6262 m_addr += bytes_read;
6266 const auto indexval_it = m_map.abbrev_map.find (abbrev);
6267 if (indexval_it == m_map.abbrev_map.cend ())
6269 complaint (&symfile_complaints,
6270 _("Wrong .debug_names undefined abbrev code %s "
6272 pulongest (abbrev), objfile_name (objfile));
6275 const mapped_debug_names::index_val &indexval = indexval_it->second;
6276 bool have_is_static = false;
6278 dwarf2_per_cu_data *per_cu = NULL;
6279 for (const mapped_debug_names::index_val::attr &attr : indexval.attr_vec)
6284 case DW_FORM_implicit_const:
6285 ull = attr.implicit_const;
6287 case DW_FORM_flag_present:
6291 ull = read_unsigned_leb128 (abfd, m_addr, &bytes_read);
6292 m_addr += bytes_read;
6295 complaint (&symfile_complaints,
6296 _("Unsupported .debug_names form %s [in module %s]"),
6297 dwarf_form_name (attr.form),
6298 objfile_name (objfile));
6301 switch (attr.dw_idx)
6303 case DW_IDX_compile_unit:
6304 /* Don't crash on bad data. */
6305 if (ull >= dwarf2_per_objfile->n_comp_units)
6307 complaint (&symfile_complaints,
6308 _(".debug_names entry has bad CU index %s"
6311 objfile_name (dwarf2_per_objfile->objfile));
6314 per_cu = dw2_get_cutu (dwarf2_per_objfile, ull);
6316 case DW_IDX_type_unit:
6317 /* Don't crash on bad data. */
6318 if (ull >= dwarf2_per_objfile->n_type_units)
6320 complaint (&symfile_complaints,
6321 _(".debug_names entry has bad TU index %s"
6324 objfile_name (dwarf2_per_objfile->objfile));
6327 per_cu = dw2_get_cutu (dwarf2_per_objfile,
6328 dwarf2_per_objfile->n_comp_units + ull);
6330 case DW_IDX_GNU_internal:
6331 if (!m_map.augmentation_is_gdb)
6333 have_is_static = true;
6336 case DW_IDX_GNU_external:
6337 if (!m_map.augmentation_is_gdb)
6339 have_is_static = true;
6345 /* Skip if already read in. */
6346 if (per_cu->v.quick->compunit_symtab)
6349 /* Check static vs global. */
6352 const bool want_static = m_block_index != GLOBAL_BLOCK;
6353 if (m_want_specific_block && want_static != is_static)
6357 /* Match dw2_symtab_iter_next, symbol_kind
6358 and debug_names::psymbol_tag. */
6362 switch (indexval.dwarf_tag)
6364 case DW_TAG_variable:
6365 case DW_TAG_subprogram:
6366 /* Some types are also in VAR_DOMAIN. */
6367 case DW_TAG_typedef:
6368 case DW_TAG_structure_type:
6375 switch (indexval.dwarf_tag)
6377 case DW_TAG_typedef:
6378 case DW_TAG_structure_type:
6385 switch (indexval.dwarf_tag)
6388 case DW_TAG_variable:
6398 /* Match dw2_expand_symtabs_matching, symbol_kind and
6399 debug_names::psymbol_tag. */
6402 case VARIABLES_DOMAIN:
6403 switch (indexval.dwarf_tag)
6405 case DW_TAG_variable:
6411 case FUNCTIONS_DOMAIN:
6412 switch (indexval.dwarf_tag)
6414 case DW_TAG_subprogram:
6421 switch (indexval.dwarf_tag)
6423 case DW_TAG_typedef:
6424 case DW_TAG_structure_type:
6437 static struct compunit_symtab *
6438 dw2_debug_names_lookup_symbol (struct objfile *objfile, int block_index_int,
6439 const char *name, domain_enum domain)
6441 const block_enum block_index = static_cast<block_enum> (block_index_int);
6442 struct dwarf2_per_objfile *dwarf2_per_objfile
6443 = get_dwarf2_per_objfile (objfile);
6445 const auto &mapp = dwarf2_per_objfile->debug_names_table;
6448 /* index is NULL if OBJF_READNOW. */
6451 const auto &map = *mapp;
6453 dw2_debug_names_iterator iter (map, true /* want_specific_block */,
6454 block_index, domain, name);
6456 struct compunit_symtab *stab_best = NULL;
6457 struct dwarf2_per_cu_data *per_cu;
6458 while ((per_cu = iter.next ()) != NULL)
6460 struct symbol *sym, *with_opaque = NULL;
6461 struct compunit_symtab *stab = dw2_instantiate_symtab (per_cu);
6462 const struct blockvector *bv = COMPUNIT_BLOCKVECTOR (stab);
6463 struct block *block = BLOCKVECTOR_BLOCK (bv, block_index);
6465 sym = block_find_symbol (block, name, domain,
6466 block_find_non_opaque_type_preferred,
6469 /* Some caution must be observed with overloaded functions and
6470 methods, since the index will not contain any overload
6471 information (but NAME might contain it). */
6474 && strcmp_iw (SYMBOL_SEARCH_NAME (sym), name) == 0)
6476 if (with_opaque != NULL
6477 && strcmp_iw (SYMBOL_SEARCH_NAME (with_opaque), name) == 0)
6480 /* Keep looking through other CUs. */
6486 /* This dumps minimal information about .debug_names. It is called
6487 via "mt print objfiles". The gdb.dwarf2/gdb-index.exp testcase
6488 uses this to verify that .debug_names has been loaded. */
6491 dw2_debug_names_dump (struct objfile *objfile)
6493 struct dwarf2_per_objfile *dwarf2_per_objfile
6494 = get_dwarf2_per_objfile (objfile);
6496 gdb_assert (dwarf2_per_objfile->using_index);
6497 printf_filtered (".debug_names:");
6498 if (dwarf2_per_objfile->debug_names_table)
6499 printf_filtered (" exists\n");
6501 printf_filtered (" faked for \"readnow\"\n");
6502 printf_filtered ("\n");
6506 dw2_debug_names_expand_symtabs_for_function (struct objfile *objfile,
6507 const char *func_name)
6509 struct dwarf2_per_objfile *dwarf2_per_objfile
6510 = get_dwarf2_per_objfile (objfile);
6512 /* dwarf2_per_objfile->debug_names_table is NULL if OBJF_READNOW. */
6513 if (dwarf2_per_objfile->debug_names_table)
6515 const mapped_debug_names &map = *dwarf2_per_objfile->debug_names_table;
6517 /* Note: It doesn't matter what we pass for block_index here. */
6518 dw2_debug_names_iterator iter (map, false /* want_specific_block */,
6519 GLOBAL_BLOCK, VAR_DOMAIN, func_name);
6521 struct dwarf2_per_cu_data *per_cu;
6522 while ((per_cu = iter.next ()) != NULL)
6523 dw2_instantiate_symtab (per_cu);
6528 dw2_debug_names_expand_symtabs_matching
6529 (struct objfile *objfile,
6530 gdb::function_view<expand_symtabs_file_matcher_ftype> file_matcher,
6531 const lookup_name_info &lookup_name,
6532 gdb::function_view<expand_symtabs_symbol_matcher_ftype> symbol_matcher,
6533 gdb::function_view<expand_symtabs_exp_notify_ftype> expansion_notify,
6534 enum search_domain kind)
6536 struct dwarf2_per_objfile *dwarf2_per_objfile
6537 = get_dwarf2_per_objfile (objfile);
6539 /* debug_names_table is NULL if OBJF_READNOW. */
6540 if (!dwarf2_per_objfile->debug_names_table)
6543 dw_expand_symtabs_matching_file_matcher (dwarf2_per_objfile, file_matcher);
6545 mapped_debug_names &map = *dwarf2_per_objfile->debug_names_table;
6547 dw2_expand_symtabs_matching_symbol (map, lookup_name,
6549 kind, [&] (offset_type namei)
6551 /* The name was matched, now expand corresponding CUs that were
6553 dw2_debug_names_iterator iter (map, kind, namei);
6555 struct dwarf2_per_cu_data *per_cu;
6556 while ((per_cu = iter.next ()) != NULL)
6557 dw2_expand_symtabs_matching_one (per_cu, file_matcher,
6562 const struct quick_symbol_functions dwarf2_debug_names_functions =
6565 dw2_find_last_source_symtab,
6566 dw2_forget_cached_source_info,
6567 dw2_map_symtabs_matching_filename,
6568 dw2_debug_names_lookup_symbol,
6570 dw2_debug_names_dump,
6572 dw2_debug_names_expand_symtabs_for_function,
6573 dw2_expand_all_symtabs,
6574 dw2_expand_symtabs_with_fullname,
6575 dw2_map_matching_symbols,
6576 dw2_debug_names_expand_symtabs_matching,
6577 dw2_find_pc_sect_compunit_symtab,
6579 dw2_map_symbol_filenames
6582 /* See symfile.h. */
6585 dwarf2_initialize_objfile (struct objfile *objfile, dw_index_kind *index_kind)
6587 struct dwarf2_per_objfile *dwarf2_per_objfile
6588 = get_dwarf2_per_objfile (objfile);
6590 /* If we're about to read full symbols, don't bother with the
6591 indices. In this case we also don't care if some other debug
6592 format is making psymtabs, because they are all about to be
6594 if ((objfile->flags & OBJF_READNOW))
6598 dwarf2_per_objfile->using_index = 1;
6599 create_all_comp_units (dwarf2_per_objfile);
6600 create_all_type_units (dwarf2_per_objfile);
6601 dwarf2_per_objfile->quick_file_names_table =
6602 create_quick_file_names_table (dwarf2_per_objfile->n_comp_units);
6604 for (i = 0; i < (dwarf2_per_objfile->n_comp_units
6605 + dwarf2_per_objfile->n_type_units); ++i)
6607 dwarf2_per_cu_data *per_cu = dw2_get_cutu (dwarf2_per_objfile, i);
6609 per_cu->v.quick = OBSTACK_ZALLOC (&objfile->objfile_obstack,
6610 struct dwarf2_per_cu_quick_data);
6613 /* Return 1 so that gdb sees the "quick" functions. However,
6614 these functions will be no-ops because we will have expanded
6616 *index_kind = dw_index_kind::GDB_INDEX;
6620 if (dwarf2_read_debug_names (dwarf2_per_objfile))
6622 *index_kind = dw_index_kind::DEBUG_NAMES;
6626 if (dwarf2_read_index (objfile))
6628 *index_kind = dw_index_kind::GDB_INDEX;
6637 /* Build a partial symbol table. */
6640 dwarf2_build_psymtabs (struct objfile *objfile)
6642 struct dwarf2_per_objfile *dwarf2_per_objfile
6643 = get_dwarf2_per_objfile (objfile);
6645 if (objfile->global_psymbols.capacity () == 0
6646 && objfile->static_psymbols.capacity () == 0)
6647 init_psymbol_list (objfile, 1024);
6651 /* This isn't really ideal: all the data we allocate on the
6652 objfile's obstack is still uselessly kept around. However,
6653 freeing it seems unsafe. */
6654 psymtab_discarder psymtabs (objfile);
6655 dwarf2_build_psymtabs_hard (dwarf2_per_objfile);
6658 CATCH (except, RETURN_MASK_ERROR)
6660 exception_print (gdb_stderr, except);
6665 /* Return the total length of the CU described by HEADER. */
6668 get_cu_length (const struct comp_unit_head *header)
6670 return header->initial_length_size + header->length;
6673 /* Return TRUE if SECT_OFF is within CU_HEADER. */
6676 offset_in_cu_p (const comp_unit_head *cu_header, sect_offset sect_off)
6678 sect_offset bottom = cu_header->sect_off;
6679 sect_offset top = cu_header->sect_off + get_cu_length (cu_header);
6681 return sect_off >= bottom && sect_off < top;
6684 /* Find the base address of the compilation unit for range lists and
6685 location lists. It will normally be specified by DW_AT_low_pc.
6686 In DWARF-3 draft 4, the base address could be overridden by
6687 DW_AT_entry_pc. It's been removed, but GCC still uses this for
6688 compilation units with discontinuous ranges. */
6691 dwarf2_find_base_address (struct die_info *die, struct dwarf2_cu *cu)
6693 struct attribute *attr;
6696 cu->base_address = 0;
6698 attr = dwarf2_attr (die, DW_AT_entry_pc, cu);
6701 cu->base_address = attr_value_as_address (attr);
6706 attr = dwarf2_attr (die, DW_AT_low_pc, cu);
6709 cu->base_address = attr_value_as_address (attr);
6715 /* Read in the comp unit header information from the debug_info at info_ptr.
6716 Use rcuh_kind::COMPILE as the default type if not known by the caller.
6717 NOTE: This leaves members offset, first_die_offset to be filled in
6720 static const gdb_byte *
6721 read_comp_unit_head (struct comp_unit_head *cu_header,
6722 const gdb_byte *info_ptr,
6723 struct dwarf2_section_info *section,
6724 rcuh_kind section_kind)
6727 unsigned int bytes_read;
6728 const char *filename = get_section_file_name (section);
6729 bfd *abfd = get_section_bfd_owner (section);
6731 cu_header->length = read_initial_length (abfd, info_ptr, &bytes_read);
6732 cu_header->initial_length_size = bytes_read;
6733 cu_header->offset_size = (bytes_read == 4) ? 4 : 8;
6734 info_ptr += bytes_read;
6735 cu_header->version = read_2_bytes (abfd, info_ptr);
6737 if (cu_header->version < 5)
6738 switch (section_kind)
6740 case rcuh_kind::COMPILE:
6741 cu_header->unit_type = DW_UT_compile;
6743 case rcuh_kind::TYPE:
6744 cu_header->unit_type = DW_UT_type;
6747 internal_error (__FILE__, __LINE__,
6748 _("read_comp_unit_head: invalid section_kind"));
6752 cu_header->unit_type = static_cast<enum dwarf_unit_type>
6753 (read_1_byte (abfd, info_ptr));
6755 switch (cu_header->unit_type)
6758 if (section_kind != rcuh_kind::COMPILE)
6759 error (_("Dwarf Error: wrong unit_type in compilation unit header "
6760 "(is DW_UT_compile, should be DW_UT_type) [in module %s]"),
6764 section_kind = rcuh_kind::TYPE;
6767 error (_("Dwarf Error: wrong unit_type in compilation unit header "
6768 "(is %d, should be %d or %d) [in module %s]"),
6769 cu_header->unit_type, DW_UT_compile, DW_UT_type, filename);
6772 cu_header->addr_size = read_1_byte (abfd, info_ptr);
6775 cu_header->abbrev_sect_off = (sect_offset) read_offset (abfd, info_ptr,
6778 info_ptr += bytes_read;
6779 if (cu_header->version < 5)
6781 cu_header->addr_size = read_1_byte (abfd, info_ptr);
6784 signed_addr = bfd_get_sign_extend_vma (abfd);
6785 if (signed_addr < 0)
6786 internal_error (__FILE__, __LINE__,
6787 _("read_comp_unit_head: dwarf from non elf file"));
6788 cu_header->signed_addr_p = signed_addr;
6790 if (section_kind == rcuh_kind::TYPE)
6792 LONGEST type_offset;
6794 cu_header->signature = read_8_bytes (abfd, info_ptr);
6797 type_offset = read_offset (abfd, info_ptr, cu_header, &bytes_read);
6798 info_ptr += bytes_read;
6799 cu_header->type_cu_offset_in_tu = (cu_offset) type_offset;
6800 if (to_underlying (cu_header->type_cu_offset_in_tu) != type_offset)
6801 error (_("Dwarf Error: Too big type_offset in compilation unit "
6802 "header (is %s) [in module %s]"), plongest (type_offset),
6809 /* Helper function that returns the proper abbrev section for
6812 static struct dwarf2_section_info *
6813 get_abbrev_section_for_cu (struct dwarf2_per_cu_data *this_cu)
6815 struct dwarf2_section_info *abbrev;
6816 struct dwarf2_per_objfile *dwarf2_per_objfile = this_cu->dwarf2_per_objfile;
6818 if (this_cu->is_dwz)
6819 abbrev = &dwarf2_get_dwz_file (dwarf2_per_objfile)->abbrev;
6821 abbrev = &dwarf2_per_objfile->abbrev;
6826 /* Subroutine of read_and_check_comp_unit_head and
6827 read_and_check_type_unit_head to simplify them.
6828 Perform various error checking on the header. */
6831 error_check_comp_unit_head (struct dwarf2_per_objfile *dwarf2_per_objfile,
6832 struct comp_unit_head *header,
6833 struct dwarf2_section_info *section,
6834 struct dwarf2_section_info *abbrev_section)
6836 const char *filename = get_section_file_name (section);
6838 if (header->version < 2 || header->version > 5)
6839 error (_("Dwarf Error: wrong version in compilation unit header "
6840 "(is %d, should be 2, 3, 4 or 5) [in module %s]"), header->version,
6843 if (to_underlying (header->abbrev_sect_off)
6844 >= dwarf2_section_size (dwarf2_per_objfile->objfile, abbrev_section))
6845 error (_("Dwarf Error: bad offset (0x%x) in compilation unit header "
6846 "(offset 0x%x + 6) [in module %s]"),
6847 to_underlying (header->abbrev_sect_off),
6848 to_underlying (header->sect_off),
6851 /* Cast to ULONGEST to use 64-bit arithmetic when possible to
6852 avoid potential 32-bit overflow. */
6853 if (((ULONGEST) header->sect_off + get_cu_length (header))
6855 error (_("Dwarf Error: bad length (0x%x) in compilation unit header "
6856 "(offset 0x%x + 0) [in module %s]"),
6857 header->length, to_underlying (header->sect_off),
6861 /* Read in a CU/TU header and perform some basic error checking.
6862 The contents of the header are stored in HEADER.
6863 The result is a pointer to the start of the first DIE. */
6865 static const gdb_byte *
6866 read_and_check_comp_unit_head (struct dwarf2_per_objfile *dwarf2_per_objfile,
6867 struct comp_unit_head *header,
6868 struct dwarf2_section_info *section,
6869 struct dwarf2_section_info *abbrev_section,
6870 const gdb_byte *info_ptr,
6871 rcuh_kind section_kind)
6873 const gdb_byte *beg_of_comp_unit = info_ptr;
6875 header->sect_off = (sect_offset) (beg_of_comp_unit - section->buffer);
6877 info_ptr = read_comp_unit_head (header, info_ptr, section, section_kind);
6879 header->first_die_cu_offset = (cu_offset) (info_ptr - beg_of_comp_unit);
6881 error_check_comp_unit_head (dwarf2_per_objfile, header, section,
6887 /* Fetch the abbreviation table offset from a comp or type unit header. */
6890 read_abbrev_offset (struct dwarf2_per_objfile *dwarf2_per_objfile,
6891 struct dwarf2_section_info *section,
6892 sect_offset sect_off)
6894 bfd *abfd = get_section_bfd_owner (section);
6895 const gdb_byte *info_ptr;
6896 unsigned int initial_length_size, offset_size;
6899 dwarf2_read_section (dwarf2_per_objfile->objfile, section);
6900 info_ptr = section->buffer + to_underlying (sect_off);
6901 read_initial_length (abfd, info_ptr, &initial_length_size);
6902 offset_size = initial_length_size == 4 ? 4 : 8;
6903 info_ptr += initial_length_size;
6905 version = read_2_bytes (abfd, info_ptr);
6909 /* Skip unit type and address size. */
6913 return (sect_offset) read_offset_1 (abfd, info_ptr, offset_size);
6916 /* Allocate a new partial symtab for file named NAME and mark this new
6917 partial symtab as being an include of PST. */
6920 dwarf2_create_include_psymtab (const char *name, struct partial_symtab *pst,
6921 struct objfile *objfile)
6923 struct partial_symtab *subpst = allocate_psymtab (name, objfile);
6925 if (!IS_ABSOLUTE_PATH (subpst->filename))
6927 /* It shares objfile->objfile_obstack. */
6928 subpst->dirname = pst->dirname;
6931 subpst->textlow = 0;
6932 subpst->texthigh = 0;
6934 subpst->dependencies
6935 = XOBNEW (&objfile->objfile_obstack, struct partial_symtab *);
6936 subpst->dependencies[0] = pst;
6937 subpst->number_of_dependencies = 1;
6939 subpst->globals_offset = 0;
6940 subpst->n_global_syms = 0;
6941 subpst->statics_offset = 0;
6942 subpst->n_static_syms = 0;
6943 subpst->compunit_symtab = NULL;
6944 subpst->read_symtab = pst->read_symtab;
6947 /* No private part is necessary for include psymtabs. This property
6948 can be used to differentiate between such include psymtabs and
6949 the regular ones. */
6950 subpst->read_symtab_private = NULL;
6953 /* Read the Line Number Program data and extract the list of files
6954 included by the source file represented by PST. Build an include
6955 partial symtab for each of these included files. */
6958 dwarf2_build_include_psymtabs (struct dwarf2_cu *cu,
6959 struct die_info *die,
6960 struct partial_symtab *pst)
6963 struct attribute *attr;
6965 attr = dwarf2_attr (die, DW_AT_stmt_list, cu);
6967 lh = dwarf_decode_line_header ((sect_offset) DW_UNSND (attr), cu);
6969 return; /* No linetable, so no includes. */
6971 /* NOTE: pst->dirname is DW_AT_comp_dir (if present). */
6972 dwarf_decode_lines (lh.get (), pst->dirname, cu, pst, pst->textlow, 1);
6976 hash_signatured_type (const void *item)
6978 const struct signatured_type *sig_type
6979 = (const struct signatured_type *) item;
6981 /* This drops the top 32 bits of the signature, but is ok for a hash. */
6982 return sig_type->signature;
6986 eq_signatured_type (const void *item_lhs, const void *item_rhs)
6988 const struct signatured_type *lhs = (const struct signatured_type *) item_lhs;
6989 const struct signatured_type *rhs = (const struct signatured_type *) item_rhs;
6991 return lhs->signature == rhs->signature;
6994 /* Allocate a hash table for signatured types. */
6997 allocate_signatured_type_table (struct objfile *objfile)
6999 return htab_create_alloc_ex (41,
7000 hash_signatured_type,
7003 &objfile->objfile_obstack,
7004 hashtab_obstack_allocate,
7005 dummy_obstack_deallocate);
7008 /* A helper function to add a signatured type CU to a table. */
7011 add_signatured_type_cu_to_table (void **slot, void *datum)
7013 struct signatured_type *sigt = (struct signatured_type *) *slot;
7014 struct signatured_type ***datap = (struct signatured_type ***) datum;
7022 /* A helper for create_debug_types_hash_table. Read types from SECTION
7023 and fill them into TYPES_HTAB. It will process only type units,
7024 therefore DW_UT_type. */
7027 create_debug_type_hash_table (struct dwarf2_per_objfile *dwarf2_per_objfile,
7028 struct dwo_file *dwo_file,
7029 dwarf2_section_info *section, htab_t &types_htab,
7030 rcuh_kind section_kind)
7032 struct objfile *objfile = dwarf2_per_objfile->objfile;
7033 struct dwarf2_section_info *abbrev_section;
7035 const gdb_byte *info_ptr, *end_ptr;
7037 abbrev_section = (dwo_file != NULL
7038 ? &dwo_file->sections.abbrev
7039 : &dwarf2_per_objfile->abbrev);
7041 if (dwarf_read_debug)
7042 fprintf_unfiltered (gdb_stdlog, "Reading %s for %s:\n",
7043 get_section_name (section),
7044 get_section_file_name (abbrev_section));
7046 dwarf2_read_section (objfile, section);
7047 info_ptr = section->buffer;
7049 if (info_ptr == NULL)
7052 /* We can't set abfd until now because the section may be empty or
7053 not present, in which case the bfd is unknown. */
7054 abfd = get_section_bfd_owner (section);
7056 /* We don't use init_cutu_and_read_dies_simple, or some such, here
7057 because we don't need to read any dies: the signature is in the
7060 end_ptr = info_ptr + section->size;
7061 while (info_ptr < end_ptr)
7063 struct signatured_type *sig_type;
7064 struct dwo_unit *dwo_tu;
7066 const gdb_byte *ptr = info_ptr;
7067 struct comp_unit_head header;
7068 unsigned int length;
7070 sect_offset sect_off = (sect_offset) (ptr - section->buffer);
7072 /* Initialize it due to a false compiler warning. */
7073 header.signature = -1;
7074 header.type_cu_offset_in_tu = (cu_offset) -1;
7076 /* We need to read the type's signature in order to build the hash
7077 table, but we don't need anything else just yet. */
7079 ptr = read_and_check_comp_unit_head (dwarf2_per_objfile, &header, section,
7080 abbrev_section, ptr, section_kind);
7082 length = get_cu_length (&header);
7084 /* Skip dummy type units. */
7085 if (ptr >= info_ptr + length
7086 || peek_abbrev_code (abfd, ptr) == 0
7087 || header.unit_type != DW_UT_type)
7093 if (types_htab == NULL)
7096 types_htab = allocate_dwo_unit_table (objfile);
7098 types_htab = allocate_signatured_type_table (objfile);
7104 dwo_tu = OBSTACK_ZALLOC (&objfile->objfile_obstack,
7106 dwo_tu->dwo_file = dwo_file;
7107 dwo_tu->signature = header.signature;
7108 dwo_tu->type_offset_in_tu = header.type_cu_offset_in_tu;
7109 dwo_tu->section = section;
7110 dwo_tu->sect_off = sect_off;
7111 dwo_tu->length = length;
7115 /* N.B.: type_offset is not usable if this type uses a DWO file.
7116 The real type_offset is in the DWO file. */
7118 sig_type = OBSTACK_ZALLOC (&objfile->objfile_obstack,
7119 struct signatured_type);
7120 sig_type->signature = header.signature;
7121 sig_type->type_offset_in_tu = header.type_cu_offset_in_tu;
7122 sig_type->per_cu.dwarf2_per_objfile = dwarf2_per_objfile;
7123 sig_type->per_cu.is_debug_types = 1;
7124 sig_type->per_cu.section = section;
7125 sig_type->per_cu.sect_off = sect_off;
7126 sig_type->per_cu.length = length;
7129 slot = htab_find_slot (types_htab,
7130 dwo_file ? (void*) dwo_tu : (void *) sig_type,
7132 gdb_assert (slot != NULL);
7135 sect_offset dup_sect_off;
7139 const struct dwo_unit *dup_tu
7140 = (const struct dwo_unit *) *slot;
7142 dup_sect_off = dup_tu->sect_off;
7146 const struct signatured_type *dup_tu
7147 = (const struct signatured_type *) *slot;
7149 dup_sect_off = dup_tu->per_cu.sect_off;
7152 complaint (&symfile_complaints,
7153 _("debug type entry at offset 0x%x is duplicate to"
7154 " the entry at offset 0x%x, signature %s"),
7155 to_underlying (sect_off), to_underlying (dup_sect_off),
7156 hex_string (header.signature));
7158 *slot = dwo_file ? (void *) dwo_tu : (void *) sig_type;
7160 if (dwarf_read_debug > 1)
7161 fprintf_unfiltered (gdb_stdlog, " offset 0x%x, signature %s\n",
7162 to_underlying (sect_off),
7163 hex_string (header.signature));
7169 /* Create the hash table of all entries in the .debug_types
7170 (or .debug_types.dwo) section(s).
7171 If reading a DWO file, then DWO_FILE is a pointer to the DWO file object,
7172 otherwise it is NULL.
7174 The result is a pointer to the hash table or NULL if there are no types.
7176 Note: This function processes DWO files only, not DWP files. */
7179 create_debug_types_hash_table (struct dwarf2_per_objfile *dwarf2_per_objfile,
7180 struct dwo_file *dwo_file,
7181 VEC (dwarf2_section_info_def) *types,
7185 struct dwarf2_section_info *section;
7187 if (VEC_empty (dwarf2_section_info_def, types))
7191 VEC_iterate (dwarf2_section_info_def, types, ix, section);
7193 create_debug_type_hash_table (dwarf2_per_objfile, dwo_file, section,
7194 types_htab, rcuh_kind::TYPE);
7197 /* Create the hash table of all entries in the .debug_types section,
7198 and initialize all_type_units.
7199 The result is zero if there is an error (e.g. missing .debug_types section),
7200 otherwise non-zero. */
7203 create_all_type_units (struct dwarf2_per_objfile *dwarf2_per_objfile)
7205 htab_t types_htab = NULL;
7206 struct signatured_type **iter;
7208 create_debug_type_hash_table (dwarf2_per_objfile, NULL,
7209 &dwarf2_per_objfile->info, types_htab,
7210 rcuh_kind::COMPILE);
7211 create_debug_types_hash_table (dwarf2_per_objfile, NULL,
7212 dwarf2_per_objfile->types, types_htab);
7213 if (types_htab == NULL)
7215 dwarf2_per_objfile->signatured_types = NULL;
7219 dwarf2_per_objfile->signatured_types = types_htab;
7221 dwarf2_per_objfile->n_type_units
7222 = dwarf2_per_objfile->n_allocated_type_units
7223 = htab_elements (types_htab);
7224 dwarf2_per_objfile->all_type_units =
7225 XNEWVEC (struct signatured_type *, dwarf2_per_objfile->n_type_units);
7226 iter = &dwarf2_per_objfile->all_type_units[0];
7227 htab_traverse_noresize (types_htab, add_signatured_type_cu_to_table, &iter);
7228 gdb_assert (iter - &dwarf2_per_objfile->all_type_units[0]
7229 == dwarf2_per_objfile->n_type_units);
7234 /* Add an entry for signature SIG to dwarf2_per_objfile->signatured_types.
7235 If SLOT is non-NULL, it is the entry to use in the hash table.
7236 Otherwise we find one. */
7238 static struct signatured_type *
7239 add_type_unit (struct dwarf2_per_objfile *dwarf2_per_objfile, ULONGEST sig,
7242 struct objfile *objfile = dwarf2_per_objfile->objfile;
7243 int n_type_units = dwarf2_per_objfile->n_type_units;
7244 struct signatured_type *sig_type;
7246 gdb_assert (n_type_units <= dwarf2_per_objfile->n_allocated_type_units);
7248 if (n_type_units > dwarf2_per_objfile->n_allocated_type_units)
7250 if (dwarf2_per_objfile->n_allocated_type_units == 0)
7251 dwarf2_per_objfile->n_allocated_type_units = 1;
7252 dwarf2_per_objfile->n_allocated_type_units *= 2;
7253 dwarf2_per_objfile->all_type_units
7254 = XRESIZEVEC (struct signatured_type *,
7255 dwarf2_per_objfile->all_type_units,
7256 dwarf2_per_objfile->n_allocated_type_units);
7257 ++dwarf2_per_objfile->tu_stats.nr_all_type_units_reallocs;
7259 dwarf2_per_objfile->n_type_units = n_type_units;
7261 sig_type = OBSTACK_ZALLOC (&objfile->objfile_obstack,
7262 struct signatured_type);
7263 dwarf2_per_objfile->all_type_units[n_type_units - 1] = sig_type;
7264 sig_type->signature = sig;
7265 sig_type->per_cu.is_debug_types = 1;
7266 if (dwarf2_per_objfile->using_index)
7268 sig_type->per_cu.v.quick =
7269 OBSTACK_ZALLOC (&objfile->objfile_obstack,
7270 struct dwarf2_per_cu_quick_data);
7275 slot = htab_find_slot (dwarf2_per_objfile->signatured_types,
7278 gdb_assert (*slot == NULL);
7280 /* The rest of sig_type must be filled in by the caller. */
7284 /* Subroutine of lookup_dwo_signatured_type and lookup_dwp_signatured_type.
7285 Fill in SIG_ENTRY with DWO_ENTRY. */
7288 fill_in_sig_entry_from_dwo_entry (struct dwarf2_per_objfile *dwarf2_per_objfile,
7289 struct signatured_type *sig_entry,
7290 struct dwo_unit *dwo_entry)
7292 /* Make sure we're not clobbering something we don't expect to. */
7293 gdb_assert (! sig_entry->per_cu.queued);
7294 gdb_assert (sig_entry->per_cu.cu == NULL);
7295 if (dwarf2_per_objfile->using_index)
7297 gdb_assert (sig_entry->per_cu.v.quick != NULL);
7298 gdb_assert (sig_entry->per_cu.v.quick->compunit_symtab == NULL);
7301 gdb_assert (sig_entry->per_cu.v.psymtab == NULL);
7302 gdb_assert (sig_entry->signature == dwo_entry->signature);
7303 gdb_assert (to_underlying (sig_entry->type_offset_in_section) == 0);
7304 gdb_assert (sig_entry->type_unit_group == NULL);
7305 gdb_assert (sig_entry->dwo_unit == NULL);
7307 sig_entry->per_cu.section = dwo_entry->section;
7308 sig_entry->per_cu.sect_off = dwo_entry->sect_off;
7309 sig_entry->per_cu.length = dwo_entry->length;
7310 sig_entry->per_cu.reading_dwo_directly = 1;
7311 sig_entry->per_cu.dwarf2_per_objfile = dwarf2_per_objfile;
7312 sig_entry->type_offset_in_tu = dwo_entry->type_offset_in_tu;
7313 sig_entry->dwo_unit = dwo_entry;
7316 /* Subroutine of lookup_signatured_type.
7317 If we haven't read the TU yet, create the signatured_type data structure
7318 for a TU to be read in directly from a DWO file, bypassing the stub.
7319 This is the "Stay in DWO Optimization": When there is no DWP file and we're
7320 using .gdb_index, then when reading a CU we want to stay in the DWO file
7321 containing that CU. Otherwise we could end up reading several other DWO
7322 files (due to comdat folding) to process the transitive closure of all the
7323 mentioned TUs, and that can be slow. The current DWO file will have every
7324 type signature that it needs.
7325 We only do this for .gdb_index because in the psymtab case we already have
7326 to read all the DWOs to build the type unit groups. */
7328 static struct signatured_type *
7329 lookup_dwo_signatured_type (struct dwarf2_cu *cu, ULONGEST sig)
7331 struct dwarf2_per_objfile *dwarf2_per_objfile
7332 = cu->per_cu->dwarf2_per_objfile;
7333 struct objfile *objfile = dwarf2_per_objfile->objfile;
7334 struct dwo_file *dwo_file;
7335 struct dwo_unit find_dwo_entry, *dwo_entry;
7336 struct signatured_type find_sig_entry, *sig_entry;
7339 gdb_assert (cu->dwo_unit && dwarf2_per_objfile->using_index);
7341 /* If TU skeletons have been removed then we may not have read in any
7343 if (dwarf2_per_objfile->signatured_types == NULL)
7345 dwarf2_per_objfile->signatured_types
7346 = allocate_signatured_type_table (objfile);
7349 /* We only ever need to read in one copy of a signatured type.
7350 Use the global signatured_types array to do our own comdat-folding
7351 of types. If this is the first time we're reading this TU, and
7352 the TU has an entry in .gdb_index, replace the recorded data from
7353 .gdb_index with this TU. */
7355 find_sig_entry.signature = sig;
7356 slot = htab_find_slot (dwarf2_per_objfile->signatured_types,
7357 &find_sig_entry, INSERT);
7358 sig_entry = (struct signatured_type *) *slot;
7360 /* We can get here with the TU already read, *or* in the process of being
7361 read. Don't reassign the global entry to point to this DWO if that's
7362 the case. Also note that if the TU is already being read, it may not
7363 have come from a DWO, the program may be a mix of Fission-compiled
7364 code and non-Fission-compiled code. */
7366 /* Have we already tried to read this TU?
7367 Note: sig_entry can be NULL if the skeleton TU was removed (thus it
7368 needn't exist in the global table yet). */
7369 if (sig_entry != NULL && sig_entry->per_cu.tu_read)
7372 /* Note: cu->dwo_unit is the dwo_unit that references this TU, not the
7373 dwo_unit of the TU itself. */
7374 dwo_file = cu->dwo_unit->dwo_file;
7376 /* Ok, this is the first time we're reading this TU. */
7377 if (dwo_file->tus == NULL)
7379 find_dwo_entry.signature = sig;
7380 dwo_entry = (struct dwo_unit *) htab_find (dwo_file->tus, &find_dwo_entry);
7381 if (dwo_entry == NULL)
7384 /* If the global table doesn't have an entry for this TU, add one. */
7385 if (sig_entry == NULL)
7386 sig_entry = add_type_unit (dwarf2_per_objfile, sig, slot);
7388 fill_in_sig_entry_from_dwo_entry (dwarf2_per_objfile, sig_entry, dwo_entry);
7389 sig_entry->per_cu.tu_read = 1;
7393 /* Subroutine of lookup_signatured_type.
7394 Look up the type for signature SIG, and if we can't find SIG in .gdb_index
7395 then try the DWP file. If the TU stub (skeleton) has been removed then
7396 it won't be in .gdb_index. */
7398 static struct signatured_type *
7399 lookup_dwp_signatured_type (struct dwarf2_cu *cu, ULONGEST sig)
7401 struct dwarf2_per_objfile *dwarf2_per_objfile
7402 = cu->per_cu->dwarf2_per_objfile;
7403 struct objfile *objfile = dwarf2_per_objfile->objfile;
7404 struct dwp_file *dwp_file = get_dwp_file (dwarf2_per_objfile);
7405 struct dwo_unit *dwo_entry;
7406 struct signatured_type find_sig_entry, *sig_entry;
7409 gdb_assert (cu->dwo_unit && dwarf2_per_objfile->using_index);
7410 gdb_assert (dwp_file != NULL);
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 find_sig_entry.signature = sig;
7421 slot = htab_find_slot (dwarf2_per_objfile->signatured_types,
7422 &find_sig_entry, INSERT);
7423 sig_entry = (struct signatured_type *) *slot;
7425 /* Have we already tried to read this TU?
7426 Note: sig_entry can be NULL if the skeleton TU was removed (thus it
7427 needn't exist in the global table yet). */
7428 if (sig_entry != NULL)
7431 if (dwp_file->tus == NULL)
7433 dwo_entry = lookup_dwo_unit_in_dwp (dwarf2_per_objfile, dwp_file, NULL,
7434 sig, 1 /* is_debug_types */);
7435 if (dwo_entry == NULL)
7438 sig_entry = add_type_unit (dwarf2_per_objfile, sig, slot);
7439 fill_in_sig_entry_from_dwo_entry (dwarf2_per_objfile, sig_entry, dwo_entry);
7444 /* Lookup a signature based type for DW_FORM_ref_sig8.
7445 Returns NULL if signature SIG is not present in the table.
7446 It is up to the caller to complain about this. */
7448 static struct signatured_type *
7449 lookup_signatured_type (struct dwarf2_cu *cu, ULONGEST sig)
7451 struct dwarf2_per_objfile *dwarf2_per_objfile
7452 = cu->per_cu->dwarf2_per_objfile;
7455 && dwarf2_per_objfile->using_index)
7457 /* We're in a DWO/DWP file, and we're using .gdb_index.
7458 These cases require special processing. */
7459 if (get_dwp_file (dwarf2_per_objfile) == NULL)
7460 return lookup_dwo_signatured_type (cu, sig);
7462 return lookup_dwp_signatured_type (cu, sig);
7466 struct signatured_type find_entry, *entry;
7468 if (dwarf2_per_objfile->signatured_types == NULL)
7470 find_entry.signature = sig;
7471 entry = ((struct signatured_type *)
7472 htab_find (dwarf2_per_objfile->signatured_types, &find_entry));
7477 /* Low level DIE reading support. */
7479 /* Initialize a die_reader_specs struct from a dwarf2_cu struct. */
7482 init_cu_die_reader (struct die_reader_specs *reader,
7483 struct dwarf2_cu *cu,
7484 struct dwarf2_section_info *section,
7485 struct dwo_file *dwo_file,
7486 struct abbrev_table *abbrev_table)
7488 gdb_assert (section->readin && section->buffer != NULL);
7489 reader->abfd = get_section_bfd_owner (section);
7491 reader->dwo_file = dwo_file;
7492 reader->die_section = section;
7493 reader->buffer = section->buffer;
7494 reader->buffer_end = section->buffer + section->size;
7495 reader->comp_dir = NULL;
7496 reader->abbrev_table = abbrev_table;
7499 /* Subroutine of init_cutu_and_read_dies to simplify it.
7500 Read in the rest of a CU/TU top level DIE from DWO_UNIT.
7501 There's just a lot of work to do, and init_cutu_and_read_dies is big enough
7504 STUB_COMP_UNIT_DIE is for the stub DIE, we copy over certain attributes
7505 from it to the DIE in the DWO. If NULL we are skipping the stub.
7506 STUB_COMP_DIR is similar to STUB_COMP_UNIT_DIE: When reading a TU directly
7507 from the DWO file, bypassing the stub, it contains the DW_AT_comp_dir
7508 attribute of the referencing CU. At most one of STUB_COMP_UNIT_DIE and
7509 STUB_COMP_DIR may be non-NULL.
7510 *RESULT_READER,*RESULT_INFO_PTR,*RESULT_COMP_UNIT_DIE,*RESULT_HAS_CHILDREN
7511 are filled in with the info of the DIE from the DWO file.
7512 *RESULT_DWO_ABBREV_TABLE will be filled in with the abbrev table allocated
7513 from the dwo. Since *RESULT_READER references this abbrev table, it must be
7514 kept around for at least as long as *RESULT_READER.
7516 The result is non-zero if a valid (non-dummy) DIE was found. */
7519 read_cutu_die_from_dwo (struct dwarf2_per_cu_data *this_cu,
7520 struct dwo_unit *dwo_unit,
7521 struct die_info *stub_comp_unit_die,
7522 const char *stub_comp_dir,
7523 struct die_reader_specs *result_reader,
7524 const gdb_byte **result_info_ptr,
7525 struct die_info **result_comp_unit_die,
7526 int *result_has_children,
7527 abbrev_table_up *result_dwo_abbrev_table)
7529 struct dwarf2_per_objfile *dwarf2_per_objfile = this_cu->dwarf2_per_objfile;
7530 struct objfile *objfile = dwarf2_per_objfile->objfile;
7531 struct dwarf2_cu *cu = this_cu->cu;
7533 const gdb_byte *begin_info_ptr, *info_ptr;
7534 struct attribute *comp_dir, *stmt_list, *low_pc, *high_pc, *ranges;
7535 int i,num_extra_attrs;
7536 struct dwarf2_section_info *dwo_abbrev_section;
7537 struct attribute *attr;
7538 struct die_info *comp_unit_die;
7540 /* At most one of these may be provided. */
7541 gdb_assert ((stub_comp_unit_die != NULL) + (stub_comp_dir != NULL) <= 1);
7543 /* These attributes aren't processed until later:
7544 DW_AT_stmt_list, DW_AT_low_pc, DW_AT_high_pc, DW_AT_ranges.
7545 DW_AT_comp_dir is used now, to find the DWO file, but it is also
7546 referenced later. However, these attributes are found in the stub
7547 which we won't have later. In order to not impose this complication
7548 on the rest of the code, we read them here and copy them to the
7557 if (stub_comp_unit_die != NULL)
7559 /* For TUs in DWO files, the DW_AT_stmt_list attribute lives in the
7561 if (! this_cu->is_debug_types)
7562 stmt_list = dwarf2_attr (stub_comp_unit_die, DW_AT_stmt_list, cu);
7563 low_pc = dwarf2_attr (stub_comp_unit_die, DW_AT_low_pc, cu);
7564 high_pc = dwarf2_attr (stub_comp_unit_die, DW_AT_high_pc, cu);
7565 ranges = dwarf2_attr (stub_comp_unit_die, DW_AT_ranges, cu);
7566 comp_dir = dwarf2_attr (stub_comp_unit_die, DW_AT_comp_dir, cu);
7568 /* There should be a DW_AT_addr_base attribute here (if needed).
7569 We need the value before we can process DW_FORM_GNU_addr_index. */
7571 attr = dwarf2_attr (stub_comp_unit_die, DW_AT_GNU_addr_base, cu);
7573 cu->addr_base = DW_UNSND (attr);
7575 /* There should be a DW_AT_ranges_base attribute here (if needed).
7576 We need the value before we can process DW_AT_ranges. */
7577 cu->ranges_base = 0;
7578 attr = dwarf2_attr (stub_comp_unit_die, DW_AT_GNU_ranges_base, cu);
7580 cu->ranges_base = DW_UNSND (attr);
7582 else if (stub_comp_dir != NULL)
7584 /* Reconstruct the comp_dir attribute to simplify the code below. */
7585 comp_dir = XOBNEW (&cu->comp_unit_obstack, struct attribute);
7586 comp_dir->name = DW_AT_comp_dir;
7587 comp_dir->form = DW_FORM_string;
7588 DW_STRING_IS_CANONICAL (comp_dir) = 0;
7589 DW_STRING (comp_dir) = stub_comp_dir;
7592 /* Set up for reading the DWO CU/TU. */
7593 cu->dwo_unit = dwo_unit;
7594 dwarf2_section_info *section = dwo_unit->section;
7595 dwarf2_read_section (objfile, section);
7596 abfd = get_section_bfd_owner (section);
7597 begin_info_ptr = info_ptr = (section->buffer
7598 + to_underlying (dwo_unit->sect_off));
7599 dwo_abbrev_section = &dwo_unit->dwo_file->sections.abbrev;
7601 if (this_cu->is_debug_types)
7603 struct signatured_type *sig_type = (struct signatured_type *) this_cu;
7605 info_ptr = read_and_check_comp_unit_head (dwarf2_per_objfile,
7606 &cu->header, section,
7608 info_ptr, rcuh_kind::TYPE);
7609 /* This is not an assert because it can be caused by bad debug info. */
7610 if (sig_type->signature != cu->header.signature)
7612 error (_("Dwarf Error: signature mismatch %s vs %s while reading"
7613 " TU at offset 0x%x [in module %s]"),
7614 hex_string (sig_type->signature),
7615 hex_string (cu->header.signature),
7616 to_underlying (dwo_unit->sect_off),
7617 bfd_get_filename (abfd));
7619 gdb_assert (dwo_unit->sect_off == cu->header.sect_off);
7620 /* For DWOs coming from DWP files, we don't know the CU length
7621 nor the type's offset in the TU until now. */
7622 dwo_unit->length = get_cu_length (&cu->header);
7623 dwo_unit->type_offset_in_tu = cu->header.type_cu_offset_in_tu;
7625 /* Establish the type offset that can be used to lookup the type.
7626 For DWO files, we don't know it until now. */
7627 sig_type->type_offset_in_section
7628 = dwo_unit->sect_off + to_underlying (dwo_unit->type_offset_in_tu);
7632 info_ptr = read_and_check_comp_unit_head (dwarf2_per_objfile,
7633 &cu->header, section,
7635 info_ptr, rcuh_kind::COMPILE);
7636 gdb_assert (dwo_unit->sect_off == cu->header.sect_off);
7637 /* For DWOs coming from DWP files, we don't know the CU length
7639 dwo_unit->length = get_cu_length (&cu->header);
7642 *result_dwo_abbrev_table
7643 = abbrev_table_read_table (dwarf2_per_objfile, dwo_abbrev_section,
7644 cu->header.abbrev_sect_off);
7645 init_cu_die_reader (result_reader, cu, section, dwo_unit->dwo_file,
7646 result_dwo_abbrev_table->get ());
7648 /* Read in the die, but leave space to copy over the attributes
7649 from the stub. This has the benefit of simplifying the rest of
7650 the code - all the work to maintain the illusion of a single
7651 DW_TAG_{compile,type}_unit DIE is done here. */
7652 num_extra_attrs = ((stmt_list != NULL)
7656 + (comp_dir != NULL));
7657 info_ptr = read_full_die_1 (result_reader, result_comp_unit_die, info_ptr,
7658 result_has_children, num_extra_attrs);
7660 /* Copy over the attributes from the stub to the DIE we just read in. */
7661 comp_unit_die = *result_comp_unit_die;
7662 i = comp_unit_die->num_attrs;
7663 if (stmt_list != NULL)
7664 comp_unit_die->attrs[i++] = *stmt_list;
7666 comp_unit_die->attrs[i++] = *low_pc;
7667 if (high_pc != NULL)
7668 comp_unit_die->attrs[i++] = *high_pc;
7670 comp_unit_die->attrs[i++] = *ranges;
7671 if (comp_dir != NULL)
7672 comp_unit_die->attrs[i++] = *comp_dir;
7673 comp_unit_die->num_attrs += num_extra_attrs;
7675 if (dwarf_die_debug)
7677 fprintf_unfiltered (gdb_stdlog,
7678 "Read die from %s@0x%x of %s:\n",
7679 get_section_name (section),
7680 (unsigned) (begin_info_ptr - section->buffer),
7681 bfd_get_filename (abfd));
7682 dump_die (comp_unit_die, dwarf_die_debug);
7685 /* Save the comp_dir attribute. If there is no DWP file then we'll read
7686 TUs by skipping the stub and going directly to the entry in the DWO file.
7687 However, skipping the stub means we won't get DW_AT_comp_dir, so we have
7688 to get it via circuitous means. Blech. */
7689 if (comp_dir != NULL)
7690 result_reader->comp_dir = DW_STRING (comp_dir);
7692 /* Skip dummy compilation units. */
7693 if (info_ptr >= begin_info_ptr + dwo_unit->length
7694 || peek_abbrev_code (abfd, info_ptr) == 0)
7697 *result_info_ptr = info_ptr;
7701 /* Subroutine of init_cutu_and_read_dies to simplify it.
7702 Look up the DWO unit specified by COMP_UNIT_DIE of THIS_CU.
7703 Returns NULL if the specified DWO unit cannot be found. */
7705 static struct dwo_unit *
7706 lookup_dwo_unit (struct dwarf2_per_cu_data *this_cu,
7707 struct die_info *comp_unit_die)
7709 struct dwarf2_cu *cu = this_cu->cu;
7711 struct dwo_unit *dwo_unit;
7712 const char *comp_dir, *dwo_name;
7714 gdb_assert (cu != NULL);
7716 /* Yeah, we look dwo_name up again, but it simplifies the code. */
7717 dwo_name = dwarf2_string_attr (comp_unit_die, DW_AT_GNU_dwo_name, cu);
7718 comp_dir = dwarf2_string_attr (comp_unit_die, DW_AT_comp_dir, cu);
7720 if (this_cu->is_debug_types)
7722 struct signatured_type *sig_type;
7724 /* Since this_cu is the first member of struct signatured_type,
7725 we can go from a pointer to one to a pointer to the other. */
7726 sig_type = (struct signatured_type *) this_cu;
7727 signature = sig_type->signature;
7728 dwo_unit = lookup_dwo_type_unit (sig_type, dwo_name, comp_dir);
7732 struct attribute *attr;
7734 attr = dwarf2_attr (comp_unit_die, DW_AT_GNU_dwo_id, cu);
7736 error (_("Dwarf Error: missing dwo_id for dwo_name %s"
7738 dwo_name, objfile_name (this_cu->dwarf2_per_objfile->objfile));
7739 signature = DW_UNSND (attr);
7740 dwo_unit = lookup_dwo_comp_unit (this_cu, dwo_name, comp_dir,
7747 /* Subroutine of init_cutu_and_read_dies to simplify it.
7748 See it for a description of the parameters.
7749 Read a TU directly from a DWO file, bypassing the stub. */
7752 init_tu_and_read_dwo_dies (struct dwarf2_per_cu_data *this_cu,
7753 int use_existing_cu, int keep,
7754 die_reader_func_ftype *die_reader_func,
7757 std::unique_ptr<dwarf2_cu> new_cu;
7758 struct signatured_type *sig_type;
7759 struct die_reader_specs reader;
7760 const gdb_byte *info_ptr;
7761 struct die_info *comp_unit_die;
7763 struct dwarf2_per_objfile *dwarf2_per_objfile = this_cu->dwarf2_per_objfile;
7765 /* Verify we can do the following downcast, and that we have the
7767 gdb_assert (this_cu->is_debug_types && this_cu->reading_dwo_directly);
7768 sig_type = (struct signatured_type *) this_cu;
7769 gdb_assert (sig_type->dwo_unit != NULL);
7771 if (use_existing_cu && this_cu->cu != NULL)
7773 gdb_assert (this_cu->cu->dwo_unit == sig_type->dwo_unit);
7774 /* There's no need to do the rereading_dwo_cu handling that
7775 init_cutu_and_read_dies does since we don't read the stub. */
7779 /* If !use_existing_cu, this_cu->cu must be NULL. */
7780 gdb_assert (this_cu->cu == NULL);
7781 new_cu.reset (new dwarf2_cu (this_cu));
7784 /* A future optimization, if needed, would be to use an existing
7785 abbrev table. When reading DWOs with skeletonless TUs, all the TUs
7786 could share abbrev tables. */
7788 /* The abbreviation table used by READER, this must live at least as long as
7790 abbrev_table_up dwo_abbrev_table;
7792 if (read_cutu_die_from_dwo (this_cu, sig_type->dwo_unit,
7793 NULL /* stub_comp_unit_die */,
7794 sig_type->dwo_unit->dwo_file->comp_dir,
7796 &comp_unit_die, &has_children,
7797 &dwo_abbrev_table) == 0)
7803 /* All the "real" work is done here. */
7804 die_reader_func (&reader, info_ptr, comp_unit_die, has_children, data);
7806 /* This duplicates the code in init_cutu_and_read_dies,
7807 but the alternative is making the latter more complex.
7808 This function is only for the special case of using DWO files directly:
7809 no point in overly complicating the general case just to handle this. */
7810 if (new_cu != NULL && keep)
7812 /* Link this CU into read_in_chain. */
7813 this_cu->cu->read_in_chain = dwarf2_per_objfile->read_in_chain;
7814 dwarf2_per_objfile->read_in_chain = this_cu;
7815 /* The chain owns it now. */
7820 /* Initialize a CU (or TU) and read its DIEs.
7821 If the CU defers to a DWO file, read the DWO file as well.
7823 ABBREV_TABLE, if non-NULL, is the abbreviation table to use.
7824 Otherwise the table specified in the comp unit header is read in and used.
7825 This is an optimization for when we already have the abbrev table.
7827 If USE_EXISTING_CU is non-zero, and THIS_CU->cu is non-NULL, then use it.
7828 Otherwise, a new CU is allocated with xmalloc.
7830 If KEEP is non-zero, then if we allocated a dwarf2_cu we add it to
7831 read_in_chain. Otherwise the dwarf2_cu data is freed at the end.
7833 WARNING: If THIS_CU is a "dummy CU" (used as filler by the incremental
7834 linker) then DIE_READER_FUNC will not get called. */
7837 init_cutu_and_read_dies (struct dwarf2_per_cu_data *this_cu,
7838 struct abbrev_table *abbrev_table,
7839 int use_existing_cu, int keep,
7840 die_reader_func_ftype *die_reader_func,
7843 struct dwarf2_per_objfile *dwarf2_per_objfile = this_cu->dwarf2_per_objfile;
7844 struct objfile *objfile = dwarf2_per_objfile->objfile;
7845 struct dwarf2_section_info *section = this_cu->section;
7846 bfd *abfd = get_section_bfd_owner (section);
7847 struct dwarf2_cu *cu;
7848 const gdb_byte *begin_info_ptr, *info_ptr;
7849 struct die_reader_specs reader;
7850 struct die_info *comp_unit_die;
7852 struct attribute *attr;
7853 struct signatured_type *sig_type = NULL;
7854 struct dwarf2_section_info *abbrev_section;
7855 /* Non-zero if CU currently points to a DWO file and we need to
7856 reread it. When this happens we need to reread the skeleton die
7857 before we can reread the DWO file (this only applies to CUs, not TUs). */
7858 int rereading_dwo_cu = 0;
7860 if (dwarf_die_debug)
7861 fprintf_unfiltered (gdb_stdlog, "Reading %s unit at offset 0x%x\n",
7862 this_cu->is_debug_types ? "type" : "comp",
7863 to_underlying (this_cu->sect_off));
7865 if (use_existing_cu)
7868 /* If we're reading a TU directly from a DWO file, including a virtual DWO
7869 file (instead of going through the stub), short-circuit all of this. */
7870 if (this_cu->reading_dwo_directly)
7872 /* Narrow down the scope of possibilities to have to understand. */
7873 gdb_assert (this_cu->is_debug_types);
7874 gdb_assert (abbrev_table == NULL);
7875 init_tu_and_read_dwo_dies (this_cu, use_existing_cu, keep,
7876 die_reader_func, data);
7880 /* This is cheap if the section is already read in. */
7881 dwarf2_read_section (objfile, section);
7883 begin_info_ptr = info_ptr = section->buffer + to_underlying (this_cu->sect_off);
7885 abbrev_section = get_abbrev_section_for_cu (this_cu);
7887 std::unique_ptr<dwarf2_cu> new_cu;
7888 if (use_existing_cu && this_cu->cu != NULL)
7891 /* If this CU is from a DWO file we need to start over, we need to
7892 refetch the attributes from the skeleton CU.
7893 This could be optimized by retrieving those attributes from when we
7894 were here the first time: the previous comp_unit_die was stored in
7895 comp_unit_obstack. But there's no data yet that we need this
7897 if (cu->dwo_unit != NULL)
7898 rereading_dwo_cu = 1;
7902 /* If !use_existing_cu, this_cu->cu must be NULL. */
7903 gdb_assert (this_cu->cu == NULL);
7904 new_cu.reset (new dwarf2_cu (this_cu));
7908 /* Get the header. */
7909 if (to_underlying (cu->header.first_die_cu_offset) != 0 && !rereading_dwo_cu)
7911 /* We already have the header, there's no need to read it in again. */
7912 info_ptr += to_underlying (cu->header.first_die_cu_offset);
7916 if (this_cu->is_debug_types)
7918 info_ptr = read_and_check_comp_unit_head (dwarf2_per_objfile,
7919 &cu->header, section,
7920 abbrev_section, info_ptr,
7923 /* Since per_cu is the first member of struct signatured_type,
7924 we can go from a pointer to one to a pointer to the other. */
7925 sig_type = (struct signatured_type *) this_cu;
7926 gdb_assert (sig_type->signature == cu->header.signature);
7927 gdb_assert (sig_type->type_offset_in_tu
7928 == cu->header.type_cu_offset_in_tu);
7929 gdb_assert (this_cu->sect_off == cu->header.sect_off);
7931 /* LENGTH has not been set yet for type units if we're
7932 using .gdb_index. */
7933 this_cu->length = get_cu_length (&cu->header);
7935 /* Establish the type offset that can be used to lookup the type. */
7936 sig_type->type_offset_in_section =
7937 this_cu->sect_off + to_underlying (sig_type->type_offset_in_tu);
7939 this_cu->dwarf_version = cu->header.version;
7943 info_ptr = read_and_check_comp_unit_head (dwarf2_per_objfile,
7944 &cu->header, section,
7947 rcuh_kind::COMPILE);
7949 gdb_assert (this_cu->sect_off == cu->header.sect_off);
7950 gdb_assert (this_cu->length == get_cu_length (&cu->header));
7951 this_cu->dwarf_version = cu->header.version;
7955 /* Skip dummy compilation units. */
7956 if (info_ptr >= begin_info_ptr + this_cu->length
7957 || peek_abbrev_code (abfd, info_ptr) == 0)
7960 /* If we don't have them yet, read the abbrevs for this compilation unit.
7961 And if we need to read them now, make sure they're freed when we're
7962 done (own the table through ABBREV_TABLE_HOLDER). */
7963 abbrev_table_up abbrev_table_holder;
7964 if (abbrev_table != NULL)
7965 gdb_assert (cu->header.abbrev_sect_off == abbrev_table->sect_off);
7969 = abbrev_table_read_table (dwarf2_per_objfile, abbrev_section,
7970 cu->header.abbrev_sect_off);
7971 abbrev_table = abbrev_table_holder.get ();
7974 /* Read the top level CU/TU die. */
7975 init_cu_die_reader (&reader, cu, section, NULL, abbrev_table);
7976 info_ptr = read_full_die (&reader, &comp_unit_die, info_ptr, &has_children);
7978 /* If we are in a DWO stub, process it and then read in the "real" CU/TU
7979 from the DWO file. read_cutu_die_from_dwo will allocate the abbreviation
7980 table from the DWO file and pass the ownership over to us. It will be
7981 referenced from READER, so we must make sure to free it after we're done
7984 Note that if USE_EXISTING_OK != 0, and THIS_CU->cu already contains a
7985 DWO CU, that this test will fail (the attribute will not be present). */
7986 attr = dwarf2_attr (comp_unit_die, DW_AT_GNU_dwo_name, cu);
7987 abbrev_table_up dwo_abbrev_table;
7990 struct dwo_unit *dwo_unit;
7991 struct die_info *dwo_comp_unit_die;
7995 complaint (&symfile_complaints,
7996 _("compilation unit with DW_AT_GNU_dwo_name"
7997 " has children (offset 0x%x) [in module %s]"),
7998 to_underlying (this_cu->sect_off), bfd_get_filename (abfd));
8000 dwo_unit = lookup_dwo_unit (this_cu, comp_unit_die);
8001 if (dwo_unit != NULL)
8003 if (read_cutu_die_from_dwo (this_cu, dwo_unit,
8004 comp_unit_die, NULL,
8006 &dwo_comp_unit_die, &has_children,
8007 &dwo_abbrev_table) == 0)
8012 comp_unit_die = dwo_comp_unit_die;
8016 /* Yikes, we couldn't find the rest of the DIE, we only have
8017 the stub. A complaint has already been logged. There's
8018 not much more we can do except pass on the stub DIE to
8019 die_reader_func. We don't want to throw an error on bad
8024 /* All of the above is setup for this call. Yikes. */
8025 die_reader_func (&reader, info_ptr, comp_unit_die, has_children, data);
8027 /* Done, clean up. */
8028 if (new_cu != NULL && keep)
8030 /* Link this CU into read_in_chain. */
8031 this_cu->cu->read_in_chain = dwarf2_per_objfile->read_in_chain;
8032 dwarf2_per_objfile->read_in_chain = this_cu;
8033 /* The chain owns it now. */
8038 /* Read CU/TU THIS_CU but do not follow DW_AT_GNU_dwo_name if present.
8039 DWO_FILE, if non-NULL, is the DWO file to read (the caller is assumed
8040 to have already done the lookup to find the DWO file).
8042 The caller is required to fill in THIS_CU->section, THIS_CU->offset, and
8043 THIS_CU->is_debug_types, but nothing else.
8045 We fill in THIS_CU->length.
8047 WARNING: If THIS_CU is a "dummy CU" (used as filler by the incremental
8048 linker) then DIE_READER_FUNC will not get called.
8050 THIS_CU->cu is always freed when done.
8051 This is done in order to not leave THIS_CU->cu in a state where we have
8052 to care whether it refers to the "main" CU or the DWO CU. */
8055 init_cutu_and_read_dies_no_follow (struct dwarf2_per_cu_data *this_cu,
8056 struct dwo_file *dwo_file,
8057 die_reader_func_ftype *die_reader_func,
8060 struct dwarf2_per_objfile *dwarf2_per_objfile = this_cu->dwarf2_per_objfile;
8061 struct objfile *objfile = dwarf2_per_objfile->objfile;
8062 struct dwarf2_section_info *section = this_cu->section;
8063 bfd *abfd = get_section_bfd_owner (section);
8064 struct dwarf2_section_info *abbrev_section;
8065 const gdb_byte *begin_info_ptr, *info_ptr;
8066 struct die_reader_specs reader;
8067 struct die_info *comp_unit_die;
8070 if (dwarf_die_debug)
8071 fprintf_unfiltered (gdb_stdlog, "Reading %s unit at offset 0x%x\n",
8072 this_cu->is_debug_types ? "type" : "comp",
8073 to_underlying (this_cu->sect_off));
8075 gdb_assert (this_cu->cu == NULL);
8077 abbrev_section = (dwo_file != NULL
8078 ? &dwo_file->sections.abbrev
8079 : get_abbrev_section_for_cu (this_cu));
8081 /* This is cheap if the section is already read in. */
8082 dwarf2_read_section (objfile, section);
8084 struct dwarf2_cu cu (this_cu);
8086 begin_info_ptr = info_ptr = section->buffer + to_underlying (this_cu->sect_off);
8087 info_ptr = read_and_check_comp_unit_head (dwarf2_per_objfile,
8088 &cu.header, section,
8089 abbrev_section, info_ptr,
8090 (this_cu->is_debug_types
8092 : rcuh_kind::COMPILE));
8094 this_cu->length = get_cu_length (&cu.header);
8096 /* Skip dummy compilation units. */
8097 if (info_ptr >= begin_info_ptr + this_cu->length
8098 || peek_abbrev_code (abfd, info_ptr) == 0)
8101 abbrev_table_up abbrev_table
8102 = abbrev_table_read_table (dwarf2_per_objfile, abbrev_section,
8103 cu.header.abbrev_sect_off);
8105 init_cu_die_reader (&reader, &cu, section, dwo_file, abbrev_table.get ());
8106 info_ptr = read_full_die (&reader, &comp_unit_die, info_ptr, &has_children);
8108 die_reader_func (&reader, info_ptr, comp_unit_die, has_children, data);
8111 /* Read a CU/TU, except that this does not look for DW_AT_GNU_dwo_name and
8112 does not lookup the specified DWO file.
8113 This cannot be used to read DWO files.
8115 THIS_CU->cu is always freed when done.
8116 This is done in order to not leave THIS_CU->cu in a state where we have
8117 to care whether it refers to the "main" CU or the DWO CU.
8118 We can revisit this if the data shows there's a performance issue. */
8121 init_cutu_and_read_dies_simple (struct dwarf2_per_cu_data *this_cu,
8122 die_reader_func_ftype *die_reader_func,
8125 init_cutu_and_read_dies_no_follow (this_cu, NULL, die_reader_func, data);
8128 /* Type Unit Groups.
8130 Type Unit Groups are a way to collapse the set of all TUs (type units) into
8131 a more manageable set. The grouping is done by DW_AT_stmt_list entry
8132 so that all types coming from the same compilation (.o file) are grouped
8133 together. A future step could be to put the types in the same symtab as
8134 the CU the types ultimately came from. */
8137 hash_type_unit_group (const void *item)
8139 const struct type_unit_group *tu_group
8140 = (const struct type_unit_group *) item;
8142 return hash_stmt_list_entry (&tu_group->hash);
8146 eq_type_unit_group (const void *item_lhs, const void *item_rhs)
8148 const struct type_unit_group *lhs = (const struct type_unit_group *) item_lhs;
8149 const struct type_unit_group *rhs = (const struct type_unit_group *) item_rhs;
8151 return eq_stmt_list_entry (&lhs->hash, &rhs->hash);
8154 /* Allocate a hash table for type unit groups. */
8157 allocate_type_unit_groups_table (struct objfile *objfile)
8159 return htab_create_alloc_ex (3,
8160 hash_type_unit_group,
8163 &objfile->objfile_obstack,
8164 hashtab_obstack_allocate,
8165 dummy_obstack_deallocate);
8168 /* Type units that don't have DW_AT_stmt_list are grouped into their own
8169 partial symtabs. We combine several TUs per psymtab to not let the size
8170 of any one psymtab grow too big. */
8171 #define NO_STMT_LIST_TYPE_UNIT_PSYMTAB (1 << 31)
8172 #define NO_STMT_LIST_TYPE_UNIT_PSYMTAB_SIZE 10
8174 /* Helper routine for get_type_unit_group.
8175 Create the type_unit_group object used to hold one or more TUs. */
8177 static struct type_unit_group *
8178 create_type_unit_group (struct dwarf2_cu *cu, sect_offset line_offset_struct)
8180 struct dwarf2_per_objfile *dwarf2_per_objfile
8181 = cu->per_cu->dwarf2_per_objfile;
8182 struct objfile *objfile = dwarf2_per_objfile->objfile;
8183 struct dwarf2_per_cu_data *per_cu;
8184 struct type_unit_group *tu_group;
8186 tu_group = OBSTACK_ZALLOC (&objfile->objfile_obstack,
8187 struct type_unit_group);
8188 per_cu = &tu_group->per_cu;
8189 per_cu->dwarf2_per_objfile = dwarf2_per_objfile;
8191 if (dwarf2_per_objfile->using_index)
8193 per_cu->v.quick = OBSTACK_ZALLOC (&objfile->objfile_obstack,
8194 struct dwarf2_per_cu_quick_data);
8198 unsigned int line_offset = to_underlying (line_offset_struct);
8199 struct partial_symtab *pst;
8202 /* Give the symtab a useful name for debug purposes. */
8203 if ((line_offset & NO_STMT_LIST_TYPE_UNIT_PSYMTAB) != 0)
8204 name = xstrprintf ("<type_units_%d>",
8205 (line_offset & ~NO_STMT_LIST_TYPE_UNIT_PSYMTAB));
8207 name = xstrprintf ("<type_units_at_0x%x>", line_offset);
8209 pst = create_partial_symtab (per_cu, name);
8215 tu_group->hash.dwo_unit = cu->dwo_unit;
8216 tu_group->hash.line_sect_off = line_offset_struct;
8221 /* Look up the type_unit_group for type unit CU, and create it if necessary.
8222 STMT_LIST is a DW_AT_stmt_list attribute. */
8224 static struct type_unit_group *
8225 get_type_unit_group (struct dwarf2_cu *cu, const struct attribute *stmt_list)
8227 struct dwarf2_per_objfile *dwarf2_per_objfile
8228 = cu->per_cu->dwarf2_per_objfile;
8229 struct tu_stats *tu_stats = &dwarf2_per_objfile->tu_stats;
8230 struct type_unit_group *tu_group;
8232 unsigned int line_offset;
8233 struct type_unit_group type_unit_group_for_lookup;
8235 if (dwarf2_per_objfile->type_unit_groups == NULL)
8237 dwarf2_per_objfile->type_unit_groups =
8238 allocate_type_unit_groups_table (dwarf2_per_objfile->objfile);
8241 /* Do we need to create a new group, or can we use an existing one? */
8245 line_offset = DW_UNSND (stmt_list);
8246 ++tu_stats->nr_symtab_sharers;
8250 /* Ugh, no stmt_list. Rare, but we have to handle it.
8251 We can do various things here like create one group per TU or
8252 spread them over multiple groups to split up the expansion work.
8253 To avoid worst case scenarios (too many groups or too large groups)
8254 we, umm, group them in bunches. */
8255 line_offset = (NO_STMT_LIST_TYPE_UNIT_PSYMTAB
8256 | (tu_stats->nr_stmt_less_type_units
8257 / NO_STMT_LIST_TYPE_UNIT_PSYMTAB_SIZE));
8258 ++tu_stats->nr_stmt_less_type_units;
8261 type_unit_group_for_lookup.hash.dwo_unit = cu->dwo_unit;
8262 type_unit_group_for_lookup.hash.line_sect_off = (sect_offset) line_offset;
8263 slot = htab_find_slot (dwarf2_per_objfile->type_unit_groups,
8264 &type_unit_group_for_lookup, INSERT);
8267 tu_group = (struct type_unit_group *) *slot;
8268 gdb_assert (tu_group != NULL);
8272 sect_offset line_offset_struct = (sect_offset) line_offset;
8273 tu_group = create_type_unit_group (cu, line_offset_struct);
8275 ++tu_stats->nr_symtabs;
8281 /* Partial symbol tables. */
8283 /* Create a psymtab named NAME and assign it to PER_CU.
8285 The caller must fill in the following details:
8286 dirname, textlow, texthigh. */
8288 static struct partial_symtab *
8289 create_partial_symtab (struct dwarf2_per_cu_data *per_cu, const char *name)
8291 struct objfile *objfile = per_cu->dwarf2_per_objfile->objfile;
8292 struct partial_symtab *pst;
8294 pst = start_psymtab_common (objfile, name, 0,
8295 objfile->global_psymbols,
8296 objfile->static_psymbols);
8298 pst->psymtabs_addrmap_supported = 1;
8300 /* This is the glue that links PST into GDB's symbol API. */
8301 pst->read_symtab_private = per_cu;
8302 pst->read_symtab = dwarf2_read_symtab;
8303 per_cu->v.psymtab = pst;
8308 /* The DATA object passed to process_psymtab_comp_unit_reader has this
8311 struct process_psymtab_comp_unit_data
8313 /* True if we are reading a DW_TAG_partial_unit. */
8315 int want_partial_unit;
8317 /* The "pretend" language that is used if the CU doesn't declare a
8320 enum language pretend_language;
8323 /* die_reader_func for process_psymtab_comp_unit. */
8326 process_psymtab_comp_unit_reader (const struct die_reader_specs *reader,
8327 const gdb_byte *info_ptr,
8328 struct die_info *comp_unit_die,
8332 struct dwarf2_cu *cu = reader->cu;
8333 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
8334 struct gdbarch *gdbarch = get_objfile_arch (objfile);
8335 struct dwarf2_per_cu_data *per_cu = cu->per_cu;
8337 CORE_ADDR best_lowpc = 0, best_highpc = 0;
8338 struct partial_symtab *pst;
8339 enum pc_bounds_kind cu_bounds_kind;
8340 const char *filename;
8341 struct process_psymtab_comp_unit_data *info
8342 = (struct process_psymtab_comp_unit_data *) data;
8344 if (comp_unit_die->tag == DW_TAG_partial_unit && !info->want_partial_unit)
8347 gdb_assert (! per_cu->is_debug_types);
8349 prepare_one_comp_unit (cu, comp_unit_die, info->pretend_language);
8351 cu->list_in_scope = &file_symbols;
8353 /* Allocate a new partial symbol table structure. */
8354 filename = dwarf2_string_attr (comp_unit_die, DW_AT_name, cu);
8355 if (filename == NULL)
8358 pst = create_partial_symtab (per_cu, filename);
8360 /* This must be done before calling dwarf2_build_include_psymtabs. */
8361 pst->dirname = dwarf2_string_attr (comp_unit_die, DW_AT_comp_dir, cu);
8363 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
8365 dwarf2_find_base_address (comp_unit_die, cu);
8367 /* Possibly set the default values of LOWPC and HIGHPC from
8369 cu_bounds_kind = dwarf2_get_pc_bounds (comp_unit_die, &best_lowpc,
8370 &best_highpc, cu, pst);
8371 if (cu_bounds_kind == PC_BOUNDS_HIGH_LOW && best_lowpc < best_highpc)
8372 /* Store the contiguous range if it is not empty; it can be empty for
8373 CUs with no code. */
8374 addrmap_set_empty (objfile->psymtabs_addrmap,
8375 gdbarch_adjust_dwarf2_addr (gdbarch,
8376 best_lowpc + baseaddr),
8377 gdbarch_adjust_dwarf2_addr (gdbarch,
8378 best_highpc + baseaddr) - 1,
8381 /* Check if comp unit has_children.
8382 If so, read the rest of the partial symbols from this comp unit.
8383 If not, there's no more debug_info for this comp unit. */
8386 struct partial_die_info *first_die;
8387 CORE_ADDR lowpc, highpc;
8389 lowpc = ((CORE_ADDR) -1);
8390 highpc = ((CORE_ADDR) 0);
8392 first_die = load_partial_dies (reader, info_ptr, 1);
8394 scan_partial_symbols (first_die, &lowpc, &highpc,
8395 cu_bounds_kind <= PC_BOUNDS_INVALID, cu);
8397 /* If we didn't find a lowpc, set it to highpc to avoid
8398 complaints from `maint check'. */
8399 if (lowpc == ((CORE_ADDR) -1))
8402 /* If the compilation unit didn't have an explicit address range,
8403 then use the information extracted from its child dies. */
8404 if (cu_bounds_kind <= PC_BOUNDS_INVALID)
8407 best_highpc = highpc;
8410 pst->textlow = gdbarch_adjust_dwarf2_addr (gdbarch, best_lowpc + baseaddr);
8411 pst->texthigh = gdbarch_adjust_dwarf2_addr (gdbarch, best_highpc + baseaddr);
8413 end_psymtab_common (objfile, pst);
8415 if (!VEC_empty (dwarf2_per_cu_ptr, cu->per_cu->imported_symtabs))
8418 int len = VEC_length (dwarf2_per_cu_ptr, cu->per_cu->imported_symtabs);
8419 struct dwarf2_per_cu_data *iter;
8421 /* Fill in 'dependencies' here; we fill in 'users' in a
8423 pst->number_of_dependencies = len;
8425 XOBNEWVEC (&objfile->objfile_obstack, struct partial_symtab *, len);
8427 VEC_iterate (dwarf2_per_cu_ptr, cu->per_cu->imported_symtabs,
8430 pst->dependencies[i] = iter->v.psymtab;
8432 VEC_free (dwarf2_per_cu_ptr, cu->per_cu->imported_symtabs);
8435 /* Get the list of files included in the current compilation unit,
8436 and build a psymtab for each of them. */
8437 dwarf2_build_include_psymtabs (cu, comp_unit_die, pst);
8439 if (dwarf_read_debug)
8441 struct gdbarch *gdbarch = get_objfile_arch (objfile);
8443 fprintf_unfiltered (gdb_stdlog,
8444 "Psymtab for %s unit @0x%x: %s - %s"
8445 ", %d global, %d static syms\n",
8446 per_cu->is_debug_types ? "type" : "comp",
8447 to_underlying (per_cu->sect_off),
8448 paddress (gdbarch, pst->textlow),
8449 paddress (gdbarch, pst->texthigh),
8450 pst->n_global_syms, pst->n_static_syms);
8454 /* Subroutine of dwarf2_build_psymtabs_hard to simplify it.
8455 Process compilation unit THIS_CU for a psymtab. */
8458 process_psymtab_comp_unit (struct dwarf2_per_cu_data *this_cu,
8459 int want_partial_unit,
8460 enum language pretend_language)
8462 /* If this compilation unit was already read in, free the
8463 cached copy in order to read it in again. This is
8464 necessary because we skipped some symbols when we first
8465 read in the compilation unit (see load_partial_dies).
8466 This problem could be avoided, but the benefit is unclear. */
8467 if (this_cu->cu != NULL)
8468 free_one_cached_comp_unit (this_cu);
8470 if (this_cu->is_debug_types)
8471 init_cutu_and_read_dies (this_cu, NULL, 0, 0, build_type_psymtabs_reader,
8475 process_psymtab_comp_unit_data info;
8476 info.want_partial_unit = want_partial_unit;
8477 info.pretend_language = pretend_language;
8478 init_cutu_and_read_dies (this_cu, NULL, 0, 0,
8479 process_psymtab_comp_unit_reader, &info);
8482 /* Age out any secondary CUs. */
8483 age_cached_comp_units (this_cu->dwarf2_per_objfile);
8486 /* Reader function for build_type_psymtabs. */
8489 build_type_psymtabs_reader (const struct die_reader_specs *reader,
8490 const gdb_byte *info_ptr,
8491 struct die_info *type_unit_die,
8495 struct dwarf2_per_objfile *dwarf2_per_objfile
8496 = reader->cu->per_cu->dwarf2_per_objfile;
8497 struct objfile *objfile = dwarf2_per_objfile->objfile;
8498 struct dwarf2_cu *cu = reader->cu;
8499 struct dwarf2_per_cu_data *per_cu = cu->per_cu;
8500 struct signatured_type *sig_type;
8501 struct type_unit_group *tu_group;
8502 struct attribute *attr;
8503 struct partial_die_info *first_die;
8504 CORE_ADDR lowpc, highpc;
8505 struct partial_symtab *pst;
8507 gdb_assert (data == NULL);
8508 gdb_assert (per_cu->is_debug_types);
8509 sig_type = (struct signatured_type *) per_cu;
8514 attr = dwarf2_attr_no_follow (type_unit_die, DW_AT_stmt_list);
8515 tu_group = get_type_unit_group (cu, attr);
8517 VEC_safe_push (sig_type_ptr, tu_group->tus, sig_type);
8519 prepare_one_comp_unit (cu, type_unit_die, language_minimal);
8520 cu->list_in_scope = &file_symbols;
8521 pst = create_partial_symtab (per_cu, "");
8524 first_die = load_partial_dies (reader, info_ptr, 1);
8526 lowpc = (CORE_ADDR) -1;
8527 highpc = (CORE_ADDR) 0;
8528 scan_partial_symbols (first_die, &lowpc, &highpc, 0, cu);
8530 end_psymtab_common (objfile, pst);
8533 /* Struct used to sort TUs by their abbreviation table offset. */
8535 struct tu_abbrev_offset
8537 struct signatured_type *sig_type;
8538 sect_offset abbrev_offset;
8541 /* Helper routine for build_type_psymtabs_1, passed to qsort. */
8544 sort_tu_by_abbrev_offset (const void *ap, const void *bp)
8546 const struct tu_abbrev_offset * const *a
8547 = (const struct tu_abbrev_offset * const*) ap;
8548 const struct tu_abbrev_offset * const *b
8549 = (const struct tu_abbrev_offset * const*) bp;
8550 sect_offset aoff = (*a)->abbrev_offset;
8551 sect_offset boff = (*b)->abbrev_offset;
8553 return (aoff > boff) - (aoff < boff);
8556 /* Efficiently read all the type units.
8557 This does the bulk of the work for build_type_psymtabs.
8559 The efficiency is because we sort TUs by the abbrev table they use and
8560 only read each abbrev table once. In one program there are 200K TUs
8561 sharing 8K abbrev tables.
8563 The main purpose of this function is to support building the
8564 dwarf2_per_objfile->type_unit_groups table.
8565 TUs typically share the DW_AT_stmt_list of the CU they came from, so we
8566 can collapse the search space by grouping them by stmt_list.
8567 The savings can be significant, in the same program from above the 200K TUs
8568 share 8K stmt_list tables.
8570 FUNC is expected to call get_type_unit_group, which will create the
8571 struct type_unit_group if necessary and add it to
8572 dwarf2_per_objfile->type_unit_groups. */
8575 build_type_psymtabs_1 (struct dwarf2_per_objfile *dwarf2_per_objfile)
8577 struct tu_stats *tu_stats = &dwarf2_per_objfile->tu_stats;
8578 struct cleanup *cleanups;
8579 abbrev_table_up abbrev_table;
8580 sect_offset abbrev_offset;
8581 struct tu_abbrev_offset *sorted_by_abbrev;
8584 /* It's up to the caller to not call us multiple times. */
8585 gdb_assert (dwarf2_per_objfile->type_unit_groups == NULL);
8587 if (dwarf2_per_objfile->n_type_units == 0)
8590 /* TUs typically share abbrev tables, and there can be way more TUs than
8591 abbrev tables. Sort by abbrev table to reduce the number of times we
8592 read each abbrev table in.
8593 Alternatives are to punt or to maintain a cache of abbrev tables.
8594 This is simpler and efficient enough for now.
8596 Later we group TUs by their DW_AT_stmt_list value (as this defines the
8597 symtab to use). Typically TUs with the same abbrev offset have the same
8598 stmt_list value too so in practice this should work well.
8600 The basic algorithm here is:
8602 sort TUs by abbrev table
8603 for each TU with same abbrev table:
8604 read abbrev table if first user
8605 read TU top level DIE
8606 [IWBN if DWO skeletons had DW_AT_stmt_list]
8609 if (dwarf_read_debug)
8610 fprintf_unfiltered (gdb_stdlog, "Building type unit groups ...\n");
8612 /* Sort in a separate table to maintain the order of all_type_units
8613 for .gdb_index: TU indices directly index all_type_units. */
8614 sorted_by_abbrev = XNEWVEC (struct tu_abbrev_offset,
8615 dwarf2_per_objfile->n_type_units);
8616 for (i = 0; i < dwarf2_per_objfile->n_type_units; ++i)
8618 struct signatured_type *sig_type = dwarf2_per_objfile->all_type_units[i];
8620 sorted_by_abbrev[i].sig_type = sig_type;
8621 sorted_by_abbrev[i].abbrev_offset =
8622 read_abbrev_offset (dwarf2_per_objfile,
8623 sig_type->per_cu.section,
8624 sig_type->per_cu.sect_off);
8626 cleanups = make_cleanup (xfree, sorted_by_abbrev);
8627 qsort (sorted_by_abbrev, dwarf2_per_objfile->n_type_units,
8628 sizeof (struct tu_abbrev_offset), sort_tu_by_abbrev_offset);
8630 abbrev_offset = (sect_offset) ~(unsigned) 0;
8632 for (i = 0; i < dwarf2_per_objfile->n_type_units; ++i)
8634 const struct tu_abbrev_offset *tu = &sorted_by_abbrev[i];
8636 /* Switch to the next abbrev table if necessary. */
8637 if (abbrev_table == NULL
8638 || tu->abbrev_offset != abbrev_offset)
8640 abbrev_offset = tu->abbrev_offset;
8642 abbrev_table_read_table (dwarf2_per_objfile,
8643 &dwarf2_per_objfile->abbrev,
8645 ++tu_stats->nr_uniq_abbrev_tables;
8648 init_cutu_and_read_dies (&tu->sig_type->per_cu, abbrev_table.get (),
8649 0, 0, build_type_psymtabs_reader, NULL);
8652 do_cleanups (cleanups);
8655 /* Print collected type unit statistics. */
8658 print_tu_stats (struct dwarf2_per_objfile *dwarf2_per_objfile)
8660 struct tu_stats *tu_stats = &dwarf2_per_objfile->tu_stats;
8662 fprintf_unfiltered (gdb_stdlog, "Type unit statistics:\n");
8663 fprintf_unfiltered (gdb_stdlog, " %d TUs\n",
8664 dwarf2_per_objfile->n_type_units);
8665 fprintf_unfiltered (gdb_stdlog, " %d uniq abbrev tables\n",
8666 tu_stats->nr_uniq_abbrev_tables);
8667 fprintf_unfiltered (gdb_stdlog, " %d symtabs from stmt_list entries\n",
8668 tu_stats->nr_symtabs);
8669 fprintf_unfiltered (gdb_stdlog, " %d symtab sharers\n",
8670 tu_stats->nr_symtab_sharers);
8671 fprintf_unfiltered (gdb_stdlog, " %d type units without a stmt_list\n",
8672 tu_stats->nr_stmt_less_type_units);
8673 fprintf_unfiltered (gdb_stdlog, " %d all_type_units reallocs\n",
8674 tu_stats->nr_all_type_units_reallocs);
8677 /* Traversal function for build_type_psymtabs. */
8680 build_type_psymtab_dependencies (void **slot, void *info)
8682 struct dwarf2_per_objfile *dwarf2_per_objfile
8683 = (struct dwarf2_per_objfile *) info;
8684 struct objfile *objfile = dwarf2_per_objfile->objfile;
8685 struct type_unit_group *tu_group = (struct type_unit_group *) *slot;
8686 struct dwarf2_per_cu_data *per_cu = &tu_group->per_cu;
8687 struct partial_symtab *pst = per_cu->v.psymtab;
8688 int len = VEC_length (sig_type_ptr, tu_group->tus);
8689 struct signatured_type *iter;
8692 gdb_assert (len > 0);
8693 gdb_assert (IS_TYPE_UNIT_GROUP (per_cu));
8695 pst->number_of_dependencies = len;
8697 XOBNEWVEC (&objfile->objfile_obstack, struct partial_symtab *, len);
8699 VEC_iterate (sig_type_ptr, tu_group->tus, i, iter);
8702 gdb_assert (iter->per_cu.is_debug_types);
8703 pst->dependencies[i] = iter->per_cu.v.psymtab;
8704 iter->type_unit_group = tu_group;
8707 VEC_free (sig_type_ptr, tu_group->tus);
8712 /* Subroutine of dwarf2_build_psymtabs_hard to simplify it.
8713 Build partial symbol tables for the .debug_types comp-units. */
8716 build_type_psymtabs (struct dwarf2_per_objfile *dwarf2_per_objfile)
8718 if (! create_all_type_units (dwarf2_per_objfile))
8721 build_type_psymtabs_1 (dwarf2_per_objfile);
8724 /* Traversal function for process_skeletonless_type_unit.
8725 Read a TU in a DWO file and build partial symbols for it. */
8728 process_skeletonless_type_unit (void **slot, void *info)
8730 struct dwo_unit *dwo_unit = (struct dwo_unit *) *slot;
8731 struct dwarf2_per_objfile *dwarf2_per_objfile
8732 = (struct dwarf2_per_objfile *) info;
8733 struct signatured_type find_entry, *entry;
8735 /* If this TU doesn't exist in the global table, add it and read it in. */
8737 if (dwarf2_per_objfile->signatured_types == NULL)
8739 dwarf2_per_objfile->signatured_types
8740 = allocate_signatured_type_table (dwarf2_per_objfile->objfile);
8743 find_entry.signature = dwo_unit->signature;
8744 slot = htab_find_slot (dwarf2_per_objfile->signatured_types, &find_entry,
8746 /* If we've already seen this type there's nothing to do. What's happening
8747 is we're doing our own version of comdat-folding here. */
8751 /* This does the job that create_all_type_units would have done for
8753 entry = add_type_unit (dwarf2_per_objfile, dwo_unit->signature, slot);
8754 fill_in_sig_entry_from_dwo_entry (dwarf2_per_objfile, entry, dwo_unit);
8757 /* This does the job that build_type_psymtabs_1 would have done. */
8758 init_cutu_and_read_dies (&entry->per_cu, NULL, 0, 0,
8759 build_type_psymtabs_reader, NULL);
8764 /* Traversal function for process_skeletonless_type_units. */
8767 process_dwo_file_for_skeletonless_type_units (void **slot, void *info)
8769 struct dwo_file *dwo_file = (struct dwo_file *) *slot;
8771 if (dwo_file->tus != NULL)
8773 htab_traverse_noresize (dwo_file->tus,
8774 process_skeletonless_type_unit, info);
8780 /* Scan all TUs of DWO files, verifying we've processed them.
8781 This is needed in case a TU was emitted without its skeleton.
8782 Note: This can't be done until we know what all the DWO files are. */
8785 process_skeletonless_type_units (struct dwarf2_per_objfile *dwarf2_per_objfile)
8787 /* Skeletonless TUs in DWP files without .gdb_index is not supported yet. */
8788 if (get_dwp_file (dwarf2_per_objfile) == NULL
8789 && dwarf2_per_objfile->dwo_files != NULL)
8791 htab_traverse_noresize (dwarf2_per_objfile->dwo_files,
8792 process_dwo_file_for_skeletonless_type_units,
8793 dwarf2_per_objfile);
8797 /* Compute the 'user' field for each psymtab in DWARF2_PER_OBJFILE. */
8800 set_partial_user (struct dwarf2_per_objfile *dwarf2_per_objfile)
8804 for (i = 0; i < dwarf2_per_objfile->n_comp_units; ++i)
8806 struct dwarf2_per_cu_data *per_cu = dw2_get_cutu (dwarf2_per_objfile, i);
8807 struct partial_symtab *pst = per_cu->v.psymtab;
8813 for (j = 0; j < pst->number_of_dependencies; ++j)
8815 /* Set the 'user' field only if it is not already set. */
8816 if (pst->dependencies[j]->user == NULL)
8817 pst->dependencies[j]->user = pst;
8822 /* Build the partial symbol table by doing a quick pass through the
8823 .debug_info and .debug_abbrev sections. */
8826 dwarf2_build_psymtabs_hard (struct dwarf2_per_objfile *dwarf2_per_objfile)
8828 struct cleanup *back_to;
8830 struct objfile *objfile = dwarf2_per_objfile->objfile;
8832 if (dwarf_read_debug)
8834 fprintf_unfiltered (gdb_stdlog, "Building psymtabs of objfile %s ...\n",
8835 objfile_name (objfile));
8838 dwarf2_per_objfile->reading_partial_symbols = 1;
8840 dwarf2_read_section (objfile, &dwarf2_per_objfile->info);
8842 /* Any cached compilation units will be linked by the per-objfile
8843 read_in_chain. Make sure to free them when we're done. */
8844 back_to = make_cleanup (free_cached_comp_units, dwarf2_per_objfile);
8846 build_type_psymtabs (dwarf2_per_objfile);
8848 create_all_comp_units (dwarf2_per_objfile);
8850 /* Create a temporary address map on a temporary obstack. We later
8851 copy this to the final obstack. */
8852 auto_obstack temp_obstack;
8854 scoped_restore save_psymtabs_addrmap
8855 = make_scoped_restore (&objfile->psymtabs_addrmap,
8856 addrmap_create_mutable (&temp_obstack));
8858 for (i = 0; i < dwarf2_per_objfile->n_comp_units; ++i)
8860 struct dwarf2_per_cu_data *per_cu = dw2_get_cutu (dwarf2_per_objfile, i);
8862 process_psymtab_comp_unit (per_cu, 0, language_minimal);
8865 /* This has to wait until we read the CUs, we need the list of DWOs. */
8866 process_skeletonless_type_units (dwarf2_per_objfile);
8868 /* Now that all TUs have been processed we can fill in the dependencies. */
8869 if (dwarf2_per_objfile->type_unit_groups != NULL)
8871 htab_traverse_noresize (dwarf2_per_objfile->type_unit_groups,
8872 build_type_psymtab_dependencies, dwarf2_per_objfile);
8875 if (dwarf_read_debug)
8876 print_tu_stats (dwarf2_per_objfile);
8878 set_partial_user (dwarf2_per_objfile);
8880 objfile->psymtabs_addrmap = addrmap_create_fixed (objfile->psymtabs_addrmap,
8881 &objfile->objfile_obstack);
8882 /* At this point we want to keep the address map. */
8883 save_psymtabs_addrmap.release ();
8885 do_cleanups (back_to);
8887 if (dwarf_read_debug)
8888 fprintf_unfiltered (gdb_stdlog, "Done building psymtabs of %s\n",
8889 objfile_name (objfile));
8892 /* die_reader_func for load_partial_comp_unit. */
8895 load_partial_comp_unit_reader (const struct die_reader_specs *reader,
8896 const gdb_byte *info_ptr,
8897 struct die_info *comp_unit_die,
8901 struct dwarf2_cu *cu = reader->cu;
8903 prepare_one_comp_unit (cu, comp_unit_die, language_minimal);
8905 /* Check if comp unit has_children.
8906 If so, read the rest of the partial symbols from this comp unit.
8907 If not, there's no more debug_info for this comp unit. */
8909 load_partial_dies (reader, info_ptr, 0);
8912 /* Load the partial DIEs for a secondary CU into memory.
8913 This is also used when rereading a primary CU with load_all_dies. */
8916 load_partial_comp_unit (struct dwarf2_per_cu_data *this_cu)
8918 init_cutu_and_read_dies (this_cu, NULL, 1, 1,
8919 load_partial_comp_unit_reader, NULL);
8923 read_comp_units_from_section (struct dwarf2_per_objfile *dwarf2_per_objfile,
8924 struct dwarf2_section_info *section,
8925 struct dwarf2_section_info *abbrev_section,
8926 unsigned int is_dwz,
8929 struct dwarf2_per_cu_data ***all_comp_units)
8931 const gdb_byte *info_ptr;
8932 struct objfile *objfile = dwarf2_per_objfile->objfile;
8934 if (dwarf_read_debug)
8935 fprintf_unfiltered (gdb_stdlog, "Reading %s for %s\n",
8936 get_section_name (section),
8937 get_section_file_name (section));
8939 dwarf2_read_section (objfile, section);
8941 info_ptr = section->buffer;
8943 while (info_ptr < section->buffer + section->size)
8945 struct dwarf2_per_cu_data *this_cu;
8947 sect_offset sect_off = (sect_offset) (info_ptr - section->buffer);
8949 comp_unit_head cu_header;
8950 read_and_check_comp_unit_head (dwarf2_per_objfile, &cu_header, section,
8951 abbrev_section, info_ptr,
8952 rcuh_kind::COMPILE);
8954 /* Save the compilation unit for later lookup. */
8955 if (cu_header.unit_type != DW_UT_type)
8957 this_cu = XOBNEW (&objfile->objfile_obstack,
8958 struct dwarf2_per_cu_data);
8959 memset (this_cu, 0, sizeof (*this_cu));
8963 auto sig_type = XOBNEW (&objfile->objfile_obstack,
8964 struct signatured_type);
8965 memset (sig_type, 0, sizeof (*sig_type));
8966 sig_type->signature = cu_header.signature;
8967 sig_type->type_offset_in_tu = cu_header.type_cu_offset_in_tu;
8968 this_cu = &sig_type->per_cu;
8970 this_cu->is_debug_types = (cu_header.unit_type == DW_UT_type);
8971 this_cu->sect_off = sect_off;
8972 this_cu->length = cu_header.length + cu_header.initial_length_size;
8973 this_cu->is_dwz = is_dwz;
8974 this_cu->dwarf2_per_objfile = dwarf2_per_objfile;
8975 this_cu->section = section;
8977 if (*n_comp_units == *n_allocated)
8980 *all_comp_units = XRESIZEVEC (struct dwarf2_per_cu_data *,
8981 *all_comp_units, *n_allocated);
8983 (*all_comp_units)[*n_comp_units] = this_cu;
8986 info_ptr = info_ptr + this_cu->length;
8990 /* Create a list of all compilation units in OBJFILE.
8991 This is only done for -readnow and building partial symtabs. */
8994 create_all_comp_units (struct dwarf2_per_objfile *dwarf2_per_objfile)
8998 struct dwarf2_per_cu_data **all_comp_units;
8999 struct dwz_file *dwz;
9000 struct objfile *objfile = dwarf2_per_objfile->objfile;
9004 all_comp_units = XNEWVEC (struct dwarf2_per_cu_data *, n_allocated);
9006 read_comp_units_from_section (dwarf2_per_objfile, &dwarf2_per_objfile->info,
9007 &dwarf2_per_objfile->abbrev, 0,
9008 &n_allocated, &n_comp_units, &all_comp_units);
9010 dwz = dwarf2_get_dwz_file (dwarf2_per_objfile);
9012 read_comp_units_from_section (dwarf2_per_objfile, &dwz->info, &dwz->abbrev,
9013 1, &n_allocated, &n_comp_units,
9016 dwarf2_per_objfile->all_comp_units = XOBNEWVEC (&objfile->objfile_obstack,
9017 struct dwarf2_per_cu_data *,
9019 memcpy (dwarf2_per_objfile->all_comp_units, all_comp_units,
9020 n_comp_units * sizeof (struct dwarf2_per_cu_data *));
9021 xfree (all_comp_units);
9022 dwarf2_per_objfile->n_comp_units = n_comp_units;
9025 /* Process all loaded DIEs for compilation unit CU, starting at
9026 FIRST_DIE. The caller should pass SET_ADDRMAP == 1 if the compilation
9027 unit DIE did not have PC info (DW_AT_low_pc and DW_AT_high_pc, or
9028 DW_AT_ranges). See the comments of add_partial_subprogram on how
9029 SET_ADDRMAP is used and how *LOWPC and *HIGHPC are updated. */
9032 scan_partial_symbols (struct partial_die_info *first_die, CORE_ADDR *lowpc,
9033 CORE_ADDR *highpc, int set_addrmap,
9034 struct dwarf2_cu *cu)
9036 struct partial_die_info *pdi;
9038 /* Now, march along the PDI's, descending into ones which have
9039 interesting children but skipping the children of the other ones,
9040 until we reach the end of the compilation unit. */
9046 fixup_partial_die (pdi, cu);
9048 /* Anonymous namespaces or modules have no name but have interesting
9049 children, so we need to look at them. Ditto for anonymous
9052 if (pdi->name != NULL || pdi->tag == DW_TAG_namespace
9053 || pdi->tag == DW_TAG_module || pdi->tag == DW_TAG_enumeration_type
9054 || pdi->tag == DW_TAG_imported_unit
9055 || pdi->tag == DW_TAG_inlined_subroutine)
9059 case DW_TAG_subprogram:
9060 case DW_TAG_inlined_subroutine:
9061 add_partial_subprogram (pdi, lowpc, highpc, set_addrmap, cu);
9063 case DW_TAG_constant:
9064 case DW_TAG_variable:
9065 case DW_TAG_typedef:
9066 case DW_TAG_union_type:
9067 if (!pdi->is_declaration)
9069 add_partial_symbol (pdi, cu);
9072 case DW_TAG_class_type:
9073 case DW_TAG_interface_type:
9074 case DW_TAG_structure_type:
9075 if (!pdi->is_declaration)
9077 add_partial_symbol (pdi, cu);
9079 if (cu->language == language_rust && pdi->has_children)
9080 scan_partial_symbols (pdi->die_child, lowpc, highpc,
9083 case DW_TAG_enumeration_type:
9084 if (!pdi->is_declaration)
9085 add_partial_enumeration (pdi, cu);
9087 case DW_TAG_base_type:
9088 case DW_TAG_subrange_type:
9089 /* File scope base type definitions are added to the partial
9091 add_partial_symbol (pdi, cu);
9093 case DW_TAG_namespace:
9094 add_partial_namespace (pdi, lowpc, highpc, set_addrmap, cu);
9097 add_partial_module (pdi, lowpc, highpc, set_addrmap, cu);
9099 case DW_TAG_imported_unit:
9101 struct dwarf2_per_cu_data *per_cu;
9103 /* For now we don't handle imported units in type units. */
9104 if (cu->per_cu->is_debug_types)
9106 error (_("Dwarf Error: DW_TAG_imported_unit is not"
9107 " supported in type units [in module %s]"),
9108 objfile_name (cu->per_cu->dwarf2_per_objfile->objfile));
9111 per_cu = dwarf2_find_containing_comp_unit
9112 (pdi->d.sect_off, pdi->is_dwz,
9113 cu->per_cu->dwarf2_per_objfile);
9115 /* Go read the partial unit, if needed. */
9116 if (per_cu->v.psymtab == NULL)
9117 process_psymtab_comp_unit (per_cu, 1, cu->language);
9119 VEC_safe_push (dwarf2_per_cu_ptr,
9120 cu->per_cu->imported_symtabs, per_cu);
9123 case DW_TAG_imported_declaration:
9124 add_partial_symbol (pdi, cu);
9131 /* If the die has a sibling, skip to the sibling. */
9133 pdi = pdi->die_sibling;
9137 /* Functions used to compute the fully scoped name of a partial DIE.
9139 Normally, this is simple. For C++, the parent DIE's fully scoped
9140 name is concatenated with "::" and the partial DIE's name.
9141 Enumerators are an exception; they use the scope of their parent
9142 enumeration type, i.e. the name of the enumeration type is not
9143 prepended to the enumerator.
9145 There are two complexities. One is DW_AT_specification; in this
9146 case "parent" means the parent of the target of the specification,
9147 instead of the direct parent of the DIE. The other is compilers
9148 which do not emit DW_TAG_namespace; in this case we try to guess
9149 the fully qualified name of structure types from their members'
9150 linkage names. This must be done using the DIE's children rather
9151 than the children of any DW_AT_specification target. We only need
9152 to do this for structures at the top level, i.e. if the target of
9153 any DW_AT_specification (if any; otherwise the DIE itself) does not
9156 /* Compute the scope prefix associated with PDI's parent, in
9157 compilation unit CU. The result will be allocated on CU's
9158 comp_unit_obstack, or a copy of the already allocated PDI->NAME
9159 field. NULL is returned if no prefix is necessary. */
9161 partial_die_parent_scope (struct partial_die_info *pdi,
9162 struct dwarf2_cu *cu)
9164 const char *grandparent_scope;
9165 struct partial_die_info *parent, *real_pdi;
9167 /* We need to look at our parent DIE; if we have a DW_AT_specification,
9168 then this means the parent of the specification DIE. */
9171 while (real_pdi->has_specification)
9172 real_pdi = find_partial_die (real_pdi->spec_offset,
9173 real_pdi->spec_is_dwz, cu);
9175 parent = real_pdi->die_parent;
9179 if (parent->scope_set)
9180 return parent->scope;
9182 fixup_partial_die (parent, cu);
9184 grandparent_scope = partial_die_parent_scope (parent, cu);
9186 /* GCC 4.0 and 4.1 had a bug (PR c++/28460) where they generated bogus
9187 DW_TAG_namespace DIEs with a name of "::" for the global namespace.
9188 Work around this problem here. */
9189 if (cu->language == language_cplus
9190 && parent->tag == DW_TAG_namespace
9191 && strcmp (parent->name, "::") == 0
9192 && grandparent_scope == NULL)
9194 parent->scope = NULL;
9195 parent->scope_set = 1;
9199 if (pdi->tag == DW_TAG_enumerator)
9200 /* Enumerators should not get the name of the enumeration as a prefix. */
9201 parent->scope = grandparent_scope;
9202 else if (parent->tag == DW_TAG_namespace
9203 || parent->tag == DW_TAG_module
9204 || parent->tag == DW_TAG_structure_type
9205 || parent->tag == DW_TAG_class_type
9206 || parent->tag == DW_TAG_interface_type
9207 || parent->tag == DW_TAG_union_type
9208 || parent->tag == DW_TAG_enumeration_type)
9210 if (grandparent_scope == NULL)
9211 parent->scope = parent->name;
9213 parent->scope = typename_concat (&cu->comp_unit_obstack,
9215 parent->name, 0, cu);
9219 /* FIXME drow/2004-04-01: What should we be doing with
9220 function-local names? For partial symbols, we should probably be
9222 complaint (&symfile_complaints,
9223 _("unhandled containing DIE tag %d for DIE at %d"),
9224 parent->tag, to_underlying (pdi->sect_off));
9225 parent->scope = grandparent_scope;
9228 parent->scope_set = 1;
9229 return parent->scope;
9232 /* Return the fully scoped name associated with PDI, from compilation unit
9233 CU. The result will be allocated with malloc. */
9236 partial_die_full_name (struct partial_die_info *pdi,
9237 struct dwarf2_cu *cu)
9239 const char *parent_scope;
9241 /* If this is a template instantiation, we can not work out the
9242 template arguments from partial DIEs. So, unfortunately, we have
9243 to go through the full DIEs. At least any work we do building
9244 types here will be reused if full symbols are loaded later. */
9245 if (pdi->has_template_arguments)
9247 fixup_partial_die (pdi, cu);
9249 if (pdi->name != NULL && strchr (pdi->name, '<') == NULL)
9251 struct die_info *die;
9252 struct attribute attr;
9253 struct dwarf2_cu *ref_cu = cu;
9255 /* DW_FORM_ref_addr is using section offset. */
9256 attr.name = (enum dwarf_attribute) 0;
9257 attr.form = DW_FORM_ref_addr;
9258 attr.u.unsnd = to_underlying (pdi->sect_off);
9259 die = follow_die_ref (NULL, &attr, &ref_cu);
9261 return xstrdup (dwarf2_full_name (NULL, die, ref_cu));
9265 parent_scope = partial_die_parent_scope (pdi, cu);
9266 if (parent_scope == NULL)
9269 return typename_concat (NULL, parent_scope, pdi->name, 0, cu);
9273 add_partial_symbol (struct partial_die_info *pdi, struct dwarf2_cu *cu)
9275 struct dwarf2_per_objfile *dwarf2_per_objfile
9276 = cu->per_cu->dwarf2_per_objfile;
9277 struct objfile *objfile = dwarf2_per_objfile->objfile;
9278 struct gdbarch *gdbarch = get_objfile_arch (objfile);
9280 const char *actual_name = NULL;
9282 char *built_actual_name;
9284 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
9286 built_actual_name = partial_die_full_name (pdi, cu);
9287 if (built_actual_name != NULL)
9288 actual_name = built_actual_name;
9290 if (actual_name == NULL)
9291 actual_name = pdi->name;
9295 case DW_TAG_inlined_subroutine:
9296 case DW_TAG_subprogram:
9297 addr = gdbarch_adjust_dwarf2_addr (gdbarch, pdi->lowpc + baseaddr);
9298 if (pdi->is_external || cu->language == language_ada)
9300 /* brobecker/2007-12-26: Normally, only "external" DIEs are part
9301 of the global scope. But in Ada, we want to be able to access
9302 nested procedures globally. So all Ada subprograms are stored
9303 in the global scope. */
9304 add_psymbol_to_list (actual_name, strlen (actual_name),
9305 built_actual_name != NULL,
9306 VAR_DOMAIN, LOC_BLOCK,
9307 &objfile->global_psymbols,
9308 addr, cu->language, objfile);
9312 add_psymbol_to_list (actual_name, strlen (actual_name),
9313 built_actual_name != NULL,
9314 VAR_DOMAIN, LOC_BLOCK,
9315 &objfile->static_psymbols,
9316 addr, cu->language, objfile);
9319 if (pdi->main_subprogram && actual_name != NULL)
9320 set_objfile_main_name (objfile, actual_name, cu->language);
9322 case DW_TAG_constant:
9324 std::vector<partial_symbol *> *list;
9326 if (pdi->is_external)
9327 list = &objfile->global_psymbols;
9329 list = &objfile->static_psymbols;
9330 add_psymbol_to_list (actual_name, strlen (actual_name),
9331 built_actual_name != NULL, VAR_DOMAIN, LOC_STATIC,
9332 list, 0, cu->language, objfile);
9335 case DW_TAG_variable:
9337 addr = decode_locdesc (pdi->d.locdesc, cu);
9341 && !dwarf2_per_objfile->has_section_at_zero)
9343 /* A global or static variable may also have been stripped
9344 out by the linker if unused, in which case its address
9345 will be nullified; do not add such variables into partial
9346 symbol table then. */
9348 else if (pdi->is_external)
9351 Don't enter into the minimal symbol tables as there is
9352 a minimal symbol table entry from the ELF symbols already.
9353 Enter into partial symbol table if it has a location
9354 descriptor or a type.
9355 If the location descriptor is missing, new_symbol will create
9356 a LOC_UNRESOLVED symbol, the address of the variable will then
9357 be determined from the minimal symbol table whenever the variable
9359 The address for the partial symbol table entry is not
9360 used by GDB, but it comes in handy for debugging partial symbol
9363 if (pdi->d.locdesc || pdi->has_type)
9364 add_psymbol_to_list (actual_name, strlen (actual_name),
9365 built_actual_name != NULL,
9366 VAR_DOMAIN, LOC_STATIC,
9367 &objfile->global_psymbols,
9369 cu->language, objfile);
9373 int has_loc = pdi->d.locdesc != NULL;
9375 /* Static Variable. Skip symbols whose value we cannot know (those
9376 without location descriptors or constant values). */
9377 if (!has_loc && !pdi->has_const_value)
9379 xfree (built_actual_name);
9383 add_psymbol_to_list (actual_name, strlen (actual_name),
9384 built_actual_name != NULL,
9385 VAR_DOMAIN, LOC_STATIC,
9386 &objfile->static_psymbols,
9387 has_loc ? addr + baseaddr : (CORE_ADDR) 0,
9388 cu->language, objfile);
9391 case DW_TAG_typedef:
9392 case DW_TAG_base_type:
9393 case DW_TAG_subrange_type:
9394 add_psymbol_to_list (actual_name, strlen (actual_name),
9395 built_actual_name != NULL,
9396 VAR_DOMAIN, LOC_TYPEDEF,
9397 &objfile->static_psymbols,
9398 0, cu->language, objfile);
9400 case DW_TAG_imported_declaration:
9401 case DW_TAG_namespace:
9402 add_psymbol_to_list (actual_name, strlen (actual_name),
9403 built_actual_name != NULL,
9404 VAR_DOMAIN, LOC_TYPEDEF,
9405 &objfile->global_psymbols,
9406 0, cu->language, objfile);
9409 add_psymbol_to_list (actual_name, strlen (actual_name),
9410 built_actual_name != NULL,
9411 MODULE_DOMAIN, LOC_TYPEDEF,
9412 &objfile->global_psymbols,
9413 0, cu->language, objfile);
9415 case DW_TAG_class_type:
9416 case DW_TAG_interface_type:
9417 case DW_TAG_structure_type:
9418 case DW_TAG_union_type:
9419 case DW_TAG_enumeration_type:
9420 /* Skip external references. The DWARF standard says in the section
9421 about "Structure, Union, and Class Type Entries": "An incomplete
9422 structure, union or class type is represented by a structure,
9423 union or class entry that does not have a byte size attribute
9424 and that has a DW_AT_declaration attribute." */
9425 if (!pdi->has_byte_size && pdi->is_declaration)
9427 xfree (built_actual_name);
9431 /* NOTE: carlton/2003-10-07: See comment in new_symbol about
9432 static vs. global. */
9433 add_psymbol_to_list (actual_name, strlen (actual_name),
9434 built_actual_name != NULL,
9435 STRUCT_DOMAIN, LOC_TYPEDEF,
9436 cu->language == language_cplus
9437 ? &objfile->global_psymbols
9438 : &objfile->static_psymbols,
9439 0, cu->language, objfile);
9442 case DW_TAG_enumerator:
9443 add_psymbol_to_list (actual_name, strlen (actual_name),
9444 built_actual_name != NULL,
9445 VAR_DOMAIN, LOC_CONST,
9446 cu->language == language_cplus
9447 ? &objfile->global_psymbols
9448 : &objfile->static_psymbols,
9449 0, cu->language, objfile);
9455 xfree (built_actual_name);
9458 /* Read a partial die corresponding to a namespace; also, add a symbol
9459 corresponding to that namespace to the symbol table. NAMESPACE is
9460 the name of the enclosing namespace. */
9463 add_partial_namespace (struct partial_die_info *pdi,
9464 CORE_ADDR *lowpc, CORE_ADDR *highpc,
9465 int set_addrmap, struct dwarf2_cu *cu)
9467 /* Add a symbol for the namespace. */
9469 add_partial_symbol (pdi, cu);
9471 /* Now scan partial symbols in that namespace. */
9473 if (pdi->has_children)
9474 scan_partial_symbols (pdi->die_child, lowpc, highpc, set_addrmap, cu);
9477 /* Read a partial die corresponding to a Fortran module. */
9480 add_partial_module (struct partial_die_info *pdi, CORE_ADDR *lowpc,
9481 CORE_ADDR *highpc, int set_addrmap, struct dwarf2_cu *cu)
9483 /* Add a symbol for the namespace. */
9485 add_partial_symbol (pdi, cu);
9487 /* Now scan partial symbols in that module. */
9489 if (pdi->has_children)
9490 scan_partial_symbols (pdi->die_child, lowpc, highpc, set_addrmap, cu);
9493 /* Read a partial die corresponding to a subprogram or an inlined
9494 subprogram and create a partial symbol for that subprogram.
9495 When the CU language allows it, this routine also defines a partial
9496 symbol for each nested subprogram that this subprogram contains.
9497 If SET_ADDRMAP is true, record the covered ranges in the addrmap.
9498 Set *LOWPC and *HIGHPC to the lowest and highest PC values found in PDI.
9500 PDI may also be a lexical block, in which case we simply search
9501 recursively for subprograms defined inside that lexical block.
9502 Again, this is only performed when the CU language allows this
9503 type of definitions. */
9506 add_partial_subprogram (struct partial_die_info *pdi,
9507 CORE_ADDR *lowpc, CORE_ADDR *highpc,
9508 int set_addrmap, struct dwarf2_cu *cu)
9510 if (pdi->tag == DW_TAG_subprogram || pdi->tag == DW_TAG_inlined_subroutine)
9512 if (pdi->has_pc_info)
9514 if (pdi->lowpc < *lowpc)
9515 *lowpc = pdi->lowpc;
9516 if (pdi->highpc > *highpc)
9517 *highpc = pdi->highpc;
9520 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
9521 struct gdbarch *gdbarch = get_objfile_arch (objfile);
9526 baseaddr = ANOFFSET (objfile->section_offsets,
9527 SECT_OFF_TEXT (objfile));
9528 lowpc = gdbarch_adjust_dwarf2_addr (gdbarch,
9529 pdi->lowpc + baseaddr);
9530 highpc = gdbarch_adjust_dwarf2_addr (gdbarch,
9531 pdi->highpc + baseaddr);
9532 addrmap_set_empty (objfile->psymtabs_addrmap, lowpc, highpc - 1,
9533 cu->per_cu->v.psymtab);
9537 if (pdi->has_pc_info || (!pdi->is_external && pdi->may_be_inlined))
9539 if (!pdi->is_declaration)
9540 /* Ignore subprogram DIEs that do not have a name, they are
9541 illegal. Do not emit a complaint at this point, we will
9542 do so when we convert this psymtab into a symtab. */
9544 add_partial_symbol (pdi, cu);
9548 if (! pdi->has_children)
9551 if (cu->language == language_ada)
9553 pdi = pdi->die_child;
9556 fixup_partial_die (pdi, cu);
9557 if (pdi->tag == DW_TAG_subprogram
9558 || pdi->tag == DW_TAG_inlined_subroutine
9559 || pdi->tag == DW_TAG_lexical_block)
9560 add_partial_subprogram (pdi, lowpc, highpc, set_addrmap, cu);
9561 pdi = pdi->die_sibling;
9566 /* Read a partial die corresponding to an enumeration type. */
9569 add_partial_enumeration (struct partial_die_info *enum_pdi,
9570 struct dwarf2_cu *cu)
9572 struct partial_die_info *pdi;
9574 if (enum_pdi->name != NULL)
9575 add_partial_symbol (enum_pdi, cu);
9577 pdi = enum_pdi->die_child;
9580 if (pdi->tag != DW_TAG_enumerator || pdi->name == NULL)
9581 complaint (&symfile_complaints, _("malformed enumerator DIE ignored"));
9583 add_partial_symbol (pdi, cu);
9584 pdi = pdi->die_sibling;
9588 /* Return the initial uleb128 in the die at INFO_PTR. */
9591 peek_abbrev_code (bfd *abfd, const gdb_byte *info_ptr)
9593 unsigned int bytes_read;
9595 return read_unsigned_leb128 (abfd, info_ptr, &bytes_read);
9598 /* Read the initial uleb128 in the die at INFO_PTR in compilation unit
9599 READER::CU. Use READER::ABBREV_TABLE to lookup any abbreviation.
9601 Return the corresponding abbrev, or NULL if the number is zero (indicating
9602 an empty DIE). In either case *BYTES_READ will be set to the length of
9603 the initial number. */
9605 static struct abbrev_info *
9606 peek_die_abbrev (const die_reader_specs &reader,
9607 const gdb_byte *info_ptr, unsigned int *bytes_read)
9609 dwarf2_cu *cu = reader.cu;
9610 bfd *abfd = cu->per_cu->dwarf2_per_objfile->objfile->obfd;
9611 unsigned int abbrev_number
9612 = read_unsigned_leb128 (abfd, info_ptr, bytes_read);
9614 if (abbrev_number == 0)
9617 abbrev_info *abbrev = reader.abbrev_table->lookup_abbrev (abbrev_number);
9620 error (_("Dwarf Error: Could not find abbrev number %d in %s"
9621 " at offset 0x%x [in module %s]"),
9622 abbrev_number, cu->per_cu->is_debug_types ? "TU" : "CU",
9623 to_underlying (cu->header.sect_off), bfd_get_filename (abfd));
9629 /* Scan the debug information for CU starting at INFO_PTR in buffer BUFFER.
9630 Returns a pointer to the end of a series of DIEs, terminated by an empty
9631 DIE. Any children of the skipped DIEs will also be skipped. */
9633 static const gdb_byte *
9634 skip_children (const struct die_reader_specs *reader, const gdb_byte *info_ptr)
9638 unsigned int bytes_read;
9639 abbrev_info *abbrev = peek_die_abbrev (*reader, info_ptr, &bytes_read);
9642 return info_ptr + bytes_read;
9644 info_ptr = skip_one_die (reader, info_ptr + bytes_read, abbrev);
9648 /* Scan the debug information for CU starting at INFO_PTR in buffer BUFFER.
9649 INFO_PTR should point just after the initial uleb128 of a DIE, and the
9650 abbrev corresponding to that skipped uleb128 should be passed in
9651 ABBREV. Returns a pointer to this DIE's sibling, skipping any
9654 static const gdb_byte *
9655 skip_one_die (const struct die_reader_specs *reader, const gdb_byte *info_ptr,
9656 struct abbrev_info *abbrev)
9658 unsigned int bytes_read;
9659 struct attribute attr;
9660 bfd *abfd = reader->abfd;
9661 struct dwarf2_cu *cu = reader->cu;
9662 const gdb_byte *buffer = reader->buffer;
9663 const gdb_byte *buffer_end = reader->buffer_end;
9664 unsigned int form, i;
9666 for (i = 0; i < abbrev->num_attrs; i++)
9668 /* The only abbrev we care about is DW_AT_sibling. */
9669 if (abbrev->attrs[i].name == DW_AT_sibling)
9671 read_attribute (reader, &attr, &abbrev->attrs[i], info_ptr);
9672 if (attr.form == DW_FORM_ref_addr)
9673 complaint (&symfile_complaints,
9674 _("ignoring absolute DW_AT_sibling"));
9677 sect_offset off = dwarf2_get_ref_die_offset (&attr);
9678 const gdb_byte *sibling_ptr = buffer + to_underlying (off);
9680 if (sibling_ptr < info_ptr)
9681 complaint (&symfile_complaints,
9682 _("DW_AT_sibling points backwards"));
9683 else if (sibling_ptr > reader->buffer_end)
9684 dwarf2_section_buffer_overflow_complaint (reader->die_section);
9690 /* If it isn't DW_AT_sibling, skip this attribute. */
9691 form = abbrev->attrs[i].form;
9695 case DW_FORM_ref_addr:
9696 /* In DWARF 2, DW_FORM_ref_addr is address sized; in DWARF 3
9697 and later it is offset sized. */
9698 if (cu->header.version == 2)
9699 info_ptr += cu->header.addr_size;
9701 info_ptr += cu->header.offset_size;
9703 case DW_FORM_GNU_ref_alt:
9704 info_ptr += cu->header.offset_size;
9707 info_ptr += cu->header.addr_size;
9714 case DW_FORM_flag_present:
9715 case DW_FORM_implicit_const:
9727 case DW_FORM_ref_sig8:
9730 case DW_FORM_data16:
9733 case DW_FORM_string:
9734 read_direct_string (abfd, info_ptr, &bytes_read);
9735 info_ptr += bytes_read;
9737 case DW_FORM_sec_offset:
9739 case DW_FORM_GNU_strp_alt:
9740 info_ptr += cu->header.offset_size;
9742 case DW_FORM_exprloc:
9744 info_ptr += read_unsigned_leb128 (abfd, info_ptr, &bytes_read);
9745 info_ptr += bytes_read;
9747 case DW_FORM_block1:
9748 info_ptr += 1 + read_1_byte (abfd, info_ptr);
9750 case DW_FORM_block2:
9751 info_ptr += 2 + read_2_bytes (abfd, info_ptr);
9753 case DW_FORM_block4:
9754 info_ptr += 4 + read_4_bytes (abfd, info_ptr);
9758 case DW_FORM_ref_udata:
9759 case DW_FORM_GNU_addr_index:
9760 case DW_FORM_GNU_str_index:
9761 info_ptr = safe_skip_leb128 (info_ptr, buffer_end);
9763 case DW_FORM_indirect:
9764 form = read_unsigned_leb128 (abfd, info_ptr, &bytes_read);
9765 info_ptr += bytes_read;
9766 /* We need to continue parsing from here, so just go back to
9768 goto skip_attribute;
9771 error (_("Dwarf Error: Cannot handle %s "
9772 "in DWARF reader [in module %s]"),
9773 dwarf_form_name (form),
9774 bfd_get_filename (abfd));
9778 if (abbrev->has_children)
9779 return skip_children (reader, info_ptr);
9784 /* Locate ORIG_PDI's sibling.
9785 INFO_PTR should point to the start of the next DIE after ORIG_PDI. */
9787 static const gdb_byte *
9788 locate_pdi_sibling (const struct die_reader_specs *reader,
9789 struct partial_die_info *orig_pdi,
9790 const gdb_byte *info_ptr)
9792 /* Do we know the sibling already? */
9794 if (orig_pdi->sibling)
9795 return orig_pdi->sibling;
9797 /* Are there any children to deal with? */
9799 if (!orig_pdi->has_children)
9802 /* Skip the children the long way. */
9804 return skip_children (reader, info_ptr);
9807 /* Expand this partial symbol table into a full symbol table. SELF is
9811 dwarf2_read_symtab (struct partial_symtab *self,
9812 struct objfile *objfile)
9814 struct dwarf2_per_objfile *dwarf2_per_objfile
9815 = get_dwarf2_per_objfile (objfile);
9819 warning (_("bug: psymtab for %s is already read in."),
9826 printf_filtered (_("Reading in symbols for %s..."),
9828 gdb_flush (gdb_stdout);
9831 /* If this psymtab is constructed from a debug-only objfile, the
9832 has_section_at_zero flag will not necessarily be correct. We
9833 can get the correct value for this flag by looking at the data
9834 associated with the (presumably stripped) associated objfile. */
9835 if (objfile->separate_debug_objfile_backlink)
9837 struct dwarf2_per_objfile *dpo_backlink
9838 = get_dwarf2_per_objfile (objfile->separate_debug_objfile_backlink);
9840 dwarf2_per_objfile->has_section_at_zero
9841 = dpo_backlink->has_section_at_zero;
9844 dwarf2_per_objfile->reading_partial_symbols = 0;
9846 psymtab_to_symtab_1 (self);
9848 /* Finish up the debug error message. */
9850 printf_filtered (_("done.\n"));
9853 process_cu_includes (dwarf2_per_objfile);
9856 /* Reading in full CUs. */
9858 /* Add PER_CU to the queue. */
9861 queue_comp_unit (struct dwarf2_per_cu_data *per_cu,
9862 enum language pretend_language)
9864 struct dwarf2_queue_item *item;
9867 item = XNEW (struct dwarf2_queue_item);
9868 item->per_cu = per_cu;
9869 item->pretend_language = pretend_language;
9872 if (dwarf2_queue == NULL)
9873 dwarf2_queue = item;
9875 dwarf2_queue_tail->next = item;
9877 dwarf2_queue_tail = item;
9880 /* If PER_CU is not yet queued, add it to the queue.
9881 If DEPENDENT_CU is non-NULL, it has a reference to PER_CU so add a
9883 The result is non-zero if PER_CU was queued, otherwise the result is zero
9884 meaning either PER_CU is already queued or it is already loaded.
9886 N.B. There is an invariant here that if a CU is queued then it is loaded.
9887 The caller is required to load PER_CU if we return non-zero. */
9890 maybe_queue_comp_unit (struct dwarf2_cu *dependent_cu,
9891 struct dwarf2_per_cu_data *per_cu,
9892 enum language pretend_language)
9894 /* We may arrive here during partial symbol reading, if we need full
9895 DIEs to process an unusual case (e.g. template arguments). Do
9896 not queue PER_CU, just tell our caller to load its DIEs. */
9897 if (per_cu->dwarf2_per_objfile->reading_partial_symbols)
9899 if (per_cu->cu == NULL || per_cu->cu->dies == NULL)
9904 /* Mark the dependence relation so that we don't flush PER_CU
9906 if (dependent_cu != NULL)
9907 dwarf2_add_dependence (dependent_cu, per_cu);
9909 /* If it's already on the queue, we have nothing to do. */
9913 /* If the compilation unit is already loaded, just mark it as
9915 if (per_cu->cu != NULL)
9917 per_cu->cu->last_used = 0;
9921 /* Add it to the queue. */
9922 queue_comp_unit (per_cu, pretend_language);
9927 /* Process the queue. */
9930 process_queue (struct dwarf2_per_objfile *dwarf2_per_objfile)
9932 struct dwarf2_queue_item *item, *next_item;
9934 if (dwarf_read_debug)
9936 fprintf_unfiltered (gdb_stdlog,
9937 "Expanding one or more symtabs of objfile %s ...\n",
9938 objfile_name (dwarf2_per_objfile->objfile));
9941 /* The queue starts out with one item, but following a DIE reference
9942 may load a new CU, adding it to the end of the queue. */
9943 for (item = dwarf2_queue; item != NULL; dwarf2_queue = item = next_item)
9945 if ((dwarf2_per_objfile->using_index
9946 ? !item->per_cu->v.quick->compunit_symtab
9947 : (item->per_cu->v.psymtab && !item->per_cu->v.psymtab->readin))
9948 /* Skip dummy CUs. */
9949 && item->per_cu->cu != NULL)
9951 struct dwarf2_per_cu_data *per_cu = item->per_cu;
9952 unsigned int debug_print_threshold;
9955 if (per_cu->is_debug_types)
9957 struct signatured_type *sig_type =
9958 (struct signatured_type *) per_cu;
9960 sprintf (buf, "TU %s at offset 0x%x",
9961 hex_string (sig_type->signature),
9962 to_underlying (per_cu->sect_off));
9963 /* There can be 100s of TUs.
9964 Only print them in verbose mode. */
9965 debug_print_threshold = 2;
9969 sprintf (buf, "CU at offset 0x%x",
9970 to_underlying (per_cu->sect_off));
9971 debug_print_threshold = 1;
9974 if (dwarf_read_debug >= debug_print_threshold)
9975 fprintf_unfiltered (gdb_stdlog, "Expanding symtab of %s\n", buf);
9977 if (per_cu->is_debug_types)
9978 process_full_type_unit (per_cu, item->pretend_language);
9980 process_full_comp_unit (per_cu, item->pretend_language);
9982 if (dwarf_read_debug >= debug_print_threshold)
9983 fprintf_unfiltered (gdb_stdlog, "Done expanding %s\n", buf);
9986 item->per_cu->queued = 0;
9987 next_item = item->next;
9991 dwarf2_queue_tail = NULL;
9993 if (dwarf_read_debug)
9995 fprintf_unfiltered (gdb_stdlog, "Done expanding symtabs of %s.\n",
9996 objfile_name (dwarf2_per_objfile->objfile));
10000 /* Read in full symbols for PST, and anything it depends on. */
10003 psymtab_to_symtab_1 (struct partial_symtab *pst)
10005 struct dwarf2_per_cu_data *per_cu;
10011 for (i = 0; i < pst->number_of_dependencies; i++)
10012 if (!pst->dependencies[i]->readin
10013 && pst->dependencies[i]->user == NULL)
10015 /* Inform about additional files that need to be read in. */
10018 /* FIXME: i18n: Need to make this a single string. */
10019 fputs_filtered (" ", gdb_stdout);
10021 fputs_filtered ("and ", gdb_stdout);
10023 printf_filtered ("%s...", pst->dependencies[i]->filename);
10024 wrap_here (""); /* Flush output. */
10025 gdb_flush (gdb_stdout);
10027 psymtab_to_symtab_1 (pst->dependencies[i]);
10030 per_cu = (struct dwarf2_per_cu_data *) pst->read_symtab_private;
10032 if (per_cu == NULL)
10034 /* It's an include file, no symbols to read for it.
10035 Everything is in the parent symtab. */
10040 dw2_do_instantiate_symtab (per_cu);
10043 /* Trivial hash function for die_info: the hash value of a DIE
10044 is its offset in .debug_info for this objfile. */
10047 die_hash (const void *item)
10049 const struct die_info *die = (const struct die_info *) item;
10051 return to_underlying (die->sect_off);
10054 /* Trivial comparison function for die_info structures: two DIEs
10055 are equal if they have the same offset. */
10058 die_eq (const void *item_lhs, const void *item_rhs)
10060 const struct die_info *die_lhs = (const struct die_info *) item_lhs;
10061 const struct die_info *die_rhs = (const struct die_info *) item_rhs;
10063 return die_lhs->sect_off == die_rhs->sect_off;
10066 /* die_reader_func for load_full_comp_unit.
10067 This is identical to read_signatured_type_reader,
10068 but is kept separate for now. */
10071 load_full_comp_unit_reader (const struct die_reader_specs *reader,
10072 const gdb_byte *info_ptr,
10073 struct die_info *comp_unit_die,
10077 struct dwarf2_cu *cu = reader->cu;
10078 enum language *language_ptr = (enum language *) data;
10080 gdb_assert (cu->die_hash == NULL);
10082 htab_create_alloc_ex (cu->header.length / 12,
10086 &cu->comp_unit_obstack,
10087 hashtab_obstack_allocate,
10088 dummy_obstack_deallocate);
10091 comp_unit_die->child = read_die_and_siblings (reader, info_ptr,
10092 &info_ptr, comp_unit_die);
10093 cu->dies = comp_unit_die;
10094 /* comp_unit_die is not stored in die_hash, no need. */
10096 /* We try not to read any attributes in this function, because not
10097 all CUs needed for references have been loaded yet, and symbol
10098 table processing isn't initialized. But we have to set the CU language,
10099 or we won't be able to build types correctly.
10100 Similarly, if we do not read the producer, we can not apply
10101 producer-specific interpretation. */
10102 prepare_one_comp_unit (cu, cu->dies, *language_ptr);
10105 /* Load the DIEs associated with PER_CU into memory. */
10108 load_full_comp_unit (struct dwarf2_per_cu_data *this_cu,
10109 enum language pretend_language)
10111 gdb_assert (! this_cu->is_debug_types);
10113 init_cutu_and_read_dies (this_cu, NULL, 1, 1,
10114 load_full_comp_unit_reader, &pretend_language);
10117 /* Add a DIE to the delayed physname list. */
10120 add_to_method_list (struct type *type, int fnfield_index, int index,
10121 const char *name, struct die_info *die,
10122 struct dwarf2_cu *cu)
10124 struct delayed_method_info mi;
10126 mi.fnfield_index = fnfield_index;
10130 cu->method_list.push_back (mi);
10133 /* Check whether [PHYSNAME, PHYSNAME+LEN) ends with a modifier like
10134 "const" / "volatile". If so, decrements LEN by the length of the
10135 modifier and return true. Otherwise return false. */
10139 check_modifier (const char *physname, size_t &len, const char (&mod)[N])
10141 size_t mod_len = sizeof (mod) - 1;
10142 if (len > mod_len && startswith (physname + (len - mod_len), mod))
10150 /* Compute the physnames of any methods on the CU's method list.
10152 The computation of method physnames is delayed in order to avoid the
10153 (bad) condition that one of the method's formal parameters is of an as yet
10154 incomplete type. */
10157 compute_delayed_physnames (struct dwarf2_cu *cu)
10159 /* Only C++ delays computing physnames. */
10160 if (cu->method_list.empty ())
10162 gdb_assert (cu->language == language_cplus);
10164 for (struct delayed_method_info &mi : cu->method_list)
10166 const char *physname;
10167 struct fn_fieldlist *fn_flp
10168 = &TYPE_FN_FIELDLIST (mi.type, mi.fnfield_index);
10169 physname = dwarf2_physname (mi.name, mi.die, cu);
10170 TYPE_FN_FIELD_PHYSNAME (fn_flp->fn_fields, mi.index)
10171 = physname ? physname : "";
10173 /* Since there's no tag to indicate whether a method is a
10174 const/volatile overload, extract that information out of the
10176 if (physname != NULL)
10178 size_t len = strlen (physname);
10182 if (physname[len] == ')') /* shortcut */
10184 else if (check_modifier (physname, len, " const"))
10185 TYPE_FN_FIELD_CONST (fn_flp->fn_fields, mi.index) = 1;
10186 else if (check_modifier (physname, len, " volatile"))
10187 TYPE_FN_FIELD_VOLATILE (fn_flp->fn_fields, mi.index) = 1;
10194 /* The list is no longer needed. */
10195 cu->method_list.clear ();
10198 /* Go objects should be embedded in a DW_TAG_module DIE,
10199 and it's not clear if/how imported objects will appear.
10200 To keep Go support simple until that's worked out,
10201 go back through what we've read and create something usable.
10202 We could do this while processing each DIE, and feels kinda cleaner,
10203 but that way is more invasive.
10204 This is to, for example, allow the user to type "p var" or "b main"
10205 without having to specify the package name, and allow lookups
10206 of module.object to work in contexts that use the expression
10210 fixup_go_packaging (struct dwarf2_cu *cu)
10212 char *package_name = NULL;
10213 struct pending *list;
10216 for (list = global_symbols; list != NULL; list = list->next)
10218 for (i = 0; i < list->nsyms; ++i)
10220 struct symbol *sym = list->symbol[i];
10222 if (SYMBOL_LANGUAGE (sym) == language_go
10223 && SYMBOL_CLASS (sym) == LOC_BLOCK)
10225 char *this_package_name = go_symbol_package_name (sym);
10227 if (this_package_name == NULL)
10229 if (package_name == NULL)
10230 package_name = this_package_name;
10233 struct objfile *objfile
10234 = cu->per_cu->dwarf2_per_objfile->objfile;
10235 if (strcmp (package_name, this_package_name) != 0)
10236 complaint (&symfile_complaints,
10237 _("Symtab %s has objects from two different Go packages: %s and %s"),
10238 (symbol_symtab (sym) != NULL
10239 ? symtab_to_filename_for_display
10240 (symbol_symtab (sym))
10241 : objfile_name (objfile)),
10242 this_package_name, package_name);
10243 xfree (this_package_name);
10249 if (package_name != NULL)
10251 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
10252 const char *saved_package_name
10253 = (const char *) obstack_copy0 (&objfile->per_bfd->storage_obstack,
10255 strlen (package_name));
10256 struct type *type = init_type (objfile, TYPE_CODE_MODULE, 0,
10257 saved_package_name);
10258 struct symbol *sym;
10260 TYPE_TAG_NAME (type) = TYPE_NAME (type);
10262 sym = allocate_symbol (objfile);
10263 SYMBOL_SET_LANGUAGE (sym, language_go, &objfile->objfile_obstack);
10264 SYMBOL_SET_NAMES (sym, saved_package_name,
10265 strlen (saved_package_name), 0, objfile);
10266 /* This is not VAR_DOMAIN because we want a way to ensure a lookup of,
10267 e.g., "main" finds the "main" module and not C's main(). */
10268 SYMBOL_DOMAIN (sym) = STRUCT_DOMAIN;
10269 SYMBOL_ACLASS_INDEX (sym) = LOC_TYPEDEF;
10270 SYMBOL_TYPE (sym) = type;
10272 add_symbol_to_list (sym, &global_symbols);
10274 xfree (package_name);
10278 /* Return the symtab for PER_CU. This works properly regardless of
10279 whether we're using the index or psymtabs. */
10281 static struct compunit_symtab *
10282 get_compunit_symtab (struct dwarf2_per_cu_data *per_cu)
10284 return (per_cu->dwarf2_per_objfile->using_index
10285 ? per_cu->v.quick->compunit_symtab
10286 : per_cu->v.psymtab->compunit_symtab);
10289 /* A helper function for computing the list of all symbol tables
10290 included by PER_CU. */
10293 recursively_compute_inclusions (VEC (compunit_symtab_ptr) **result,
10294 htab_t all_children, htab_t all_type_symtabs,
10295 struct dwarf2_per_cu_data *per_cu,
10296 struct compunit_symtab *immediate_parent)
10300 struct compunit_symtab *cust;
10301 struct dwarf2_per_cu_data *iter;
10303 slot = htab_find_slot (all_children, per_cu, INSERT);
10306 /* This inclusion and its children have been processed. */
10311 /* Only add a CU if it has a symbol table. */
10312 cust = get_compunit_symtab (per_cu);
10315 /* If this is a type unit only add its symbol table if we haven't
10316 seen it yet (type unit per_cu's can share symtabs). */
10317 if (per_cu->is_debug_types)
10319 slot = htab_find_slot (all_type_symtabs, cust, INSERT);
10323 VEC_safe_push (compunit_symtab_ptr, *result, cust);
10324 if (cust->user == NULL)
10325 cust->user = immediate_parent;
10330 VEC_safe_push (compunit_symtab_ptr, *result, cust);
10331 if (cust->user == NULL)
10332 cust->user = immediate_parent;
10337 VEC_iterate (dwarf2_per_cu_ptr, per_cu->imported_symtabs, ix, iter);
10340 recursively_compute_inclusions (result, all_children,
10341 all_type_symtabs, iter, cust);
10345 /* Compute the compunit_symtab 'includes' fields for the compunit_symtab of
10349 compute_compunit_symtab_includes (struct dwarf2_per_cu_data *per_cu)
10351 gdb_assert (! per_cu->is_debug_types);
10353 if (!VEC_empty (dwarf2_per_cu_ptr, per_cu->imported_symtabs))
10356 struct dwarf2_per_cu_data *per_cu_iter;
10357 struct compunit_symtab *compunit_symtab_iter;
10358 VEC (compunit_symtab_ptr) *result_symtabs = NULL;
10359 htab_t all_children, all_type_symtabs;
10360 struct compunit_symtab *cust = get_compunit_symtab (per_cu);
10362 /* If we don't have a symtab, we can just skip this case. */
10366 all_children = htab_create_alloc (1, htab_hash_pointer, htab_eq_pointer,
10367 NULL, xcalloc, xfree);
10368 all_type_symtabs = htab_create_alloc (1, htab_hash_pointer, htab_eq_pointer,
10369 NULL, xcalloc, xfree);
10372 VEC_iterate (dwarf2_per_cu_ptr, per_cu->imported_symtabs,
10376 recursively_compute_inclusions (&result_symtabs, all_children,
10377 all_type_symtabs, per_cu_iter,
10381 /* Now we have a transitive closure of all the included symtabs. */
10382 len = VEC_length (compunit_symtab_ptr, result_symtabs);
10384 = XOBNEWVEC (&per_cu->dwarf2_per_objfile->objfile->objfile_obstack,
10385 struct compunit_symtab *, len + 1);
10387 VEC_iterate (compunit_symtab_ptr, result_symtabs, ix,
10388 compunit_symtab_iter);
10390 cust->includes[ix] = compunit_symtab_iter;
10391 cust->includes[len] = NULL;
10393 VEC_free (compunit_symtab_ptr, result_symtabs);
10394 htab_delete (all_children);
10395 htab_delete (all_type_symtabs);
10399 /* Compute the 'includes' field for the symtabs of all the CUs we just
10403 process_cu_includes (struct dwarf2_per_objfile *dwarf2_per_objfile)
10406 struct dwarf2_per_cu_data *iter;
10409 VEC_iterate (dwarf2_per_cu_ptr, dwarf2_per_objfile->just_read_cus,
10413 if (! iter->is_debug_types)
10414 compute_compunit_symtab_includes (iter);
10417 VEC_free (dwarf2_per_cu_ptr, dwarf2_per_objfile->just_read_cus);
10420 /* Generate full symbol information for PER_CU, whose DIEs have
10421 already been loaded into memory. */
10424 process_full_comp_unit (struct dwarf2_per_cu_data *per_cu,
10425 enum language pretend_language)
10427 struct dwarf2_cu *cu = per_cu->cu;
10428 struct dwarf2_per_objfile *dwarf2_per_objfile = per_cu->dwarf2_per_objfile;
10429 struct objfile *objfile = dwarf2_per_objfile->objfile;
10430 struct gdbarch *gdbarch = get_objfile_arch (objfile);
10431 CORE_ADDR lowpc, highpc;
10432 struct compunit_symtab *cust;
10433 CORE_ADDR baseaddr;
10434 struct block *static_block;
10437 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
10440 scoped_free_pendings free_pending;
10442 /* Clear the list here in case something was left over. */
10443 cu->method_list.clear ();
10445 cu->list_in_scope = &file_symbols;
10447 cu->language = pretend_language;
10448 cu->language_defn = language_def (cu->language);
10450 /* Do line number decoding in read_file_scope () */
10451 process_die (cu->dies, cu);
10453 /* For now fudge the Go package. */
10454 if (cu->language == language_go)
10455 fixup_go_packaging (cu);
10457 /* Now that we have processed all the DIEs in the CU, all the types
10458 should be complete, and it should now be safe to compute all of the
10460 compute_delayed_physnames (cu);
10462 /* Some compilers don't define a DW_AT_high_pc attribute for the
10463 compilation unit. If the DW_AT_high_pc is missing, synthesize
10464 it, by scanning the DIE's below the compilation unit. */
10465 get_scope_pc_bounds (cu->dies, &lowpc, &highpc, cu);
10467 addr = gdbarch_adjust_dwarf2_addr (gdbarch, highpc + baseaddr);
10468 static_block = end_symtab_get_static_block (addr, 0, 1);
10470 /* If the comp unit has DW_AT_ranges, it may have discontiguous ranges.
10471 Also, DW_AT_ranges may record ranges not belonging to any child DIEs
10472 (such as virtual method tables). Record the ranges in STATIC_BLOCK's
10473 addrmap to help ensure it has an accurate map of pc values belonging to
10475 dwarf2_record_block_ranges (cu->dies, static_block, baseaddr, cu);
10477 cust = end_symtab_from_static_block (static_block,
10478 SECT_OFF_TEXT (objfile), 0);
10482 int gcc_4_minor = producer_is_gcc_ge_4 (cu->producer);
10484 /* Set symtab language to language from DW_AT_language. If the
10485 compilation is from a C file generated by language preprocessors, do
10486 not set the language if it was already deduced by start_subfile. */
10487 if (!(cu->language == language_c
10488 && COMPUNIT_FILETABS (cust)->language != language_unknown))
10489 COMPUNIT_FILETABS (cust)->language = cu->language;
10491 /* GCC-4.0 has started to support -fvar-tracking. GCC-3.x still can
10492 produce DW_AT_location with location lists but it can be possibly
10493 invalid without -fvar-tracking. Still up to GCC-4.4.x incl. 4.4.0
10494 there were bugs in prologue debug info, fixed later in GCC-4.5
10495 by "unwind info for epilogues" patch (which is not directly related).
10497 For -gdwarf-4 type units LOCATIONS_VALID indication is fortunately not
10498 needed, it would be wrong due to missing DW_AT_producer there.
10500 Still one can confuse GDB by using non-standard GCC compilation
10501 options - this waits on GCC PR other/32998 (-frecord-gcc-switches).
10503 if (cu->has_loclist && gcc_4_minor >= 5)
10504 cust->locations_valid = 1;
10506 if (gcc_4_minor >= 5)
10507 cust->epilogue_unwind_valid = 1;
10509 cust->call_site_htab = cu->call_site_htab;
10512 if (dwarf2_per_objfile->using_index)
10513 per_cu->v.quick->compunit_symtab = cust;
10516 struct partial_symtab *pst = per_cu->v.psymtab;
10517 pst->compunit_symtab = cust;
10521 /* Push it for inclusion processing later. */
10522 VEC_safe_push (dwarf2_per_cu_ptr, dwarf2_per_objfile->just_read_cus, per_cu);
10525 /* Generate full symbol information for type unit PER_CU, whose DIEs have
10526 already been loaded into memory. */
10529 process_full_type_unit (struct dwarf2_per_cu_data *per_cu,
10530 enum language pretend_language)
10532 struct dwarf2_cu *cu = per_cu->cu;
10533 struct dwarf2_per_objfile *dwarf2_per_objfile = per_cu->dwarf2_per_objfile;
10534 struct objfile *objfile = dwarf2_per_objfile->objfile;
10535 struct compunit_symtab *cust;
10536 struct signatured_type *sig_type;
10538 gdb_assert (per_cu->is_debug_types);
10539 sig_type = (struct signatured_type *) per_cu;
10542 scoped_free_pendings free_pending;
10544 /* Clear the list here in case something was left over. */
10545 cu->method_list.clear ();
10547 cu->list_in_scope = &file_symbols;
10549 cu->language = pretend_language;
10550 cu->language_defn = language_def (cu->language);
10552 /* The symbol tables are set up in read_type_unit_scope. */
10553 process_die (cu->dies, cu);
10555 /* For now fudge the Go package. */
10556 if (cu->language == language_go)
10557 fixup_go_packaging (cu);
10559 /* Now that we have processed all the DIEs in the CU, all the types
10560 should be complete, and it should now be safe to compute all of the
10562 compute_delayed_physnames (cu);
10564 /* TUs share symbol tables.
10565 If this is the first TU to use this symtab, complete the construction
10566 of it with end_expandable_symtab. Otherwise, complete the addition of
10567 this TU's symbols to the existing symtab. */
10568 if (sig_type->type_unit_group->compunit_symtab == NULL)
10570 cust = end_expandable_symtab (0, SECT_OFF_TEXT (objfile));
10571 sig_type->type_unit_group->compunit_symtab = cust;
10575 /* Set symtab language to language from DW_AT_language. If the
10576 compilation is from a C file generated by language preprocessors,
10577 do not set the language if it was already deduced by
10579 if (!(cu->language == language_c
10580 && COMPUNIT_FILETABS (cust)->language != language_c))
10581 COMPUNIT_FILETABS (cust)->language = cu->language;
10586 augment_type_symtab ();
10587 cust = sig_type->type_unit_group->compunit_symtab;
10590 if (dwarf2_per_objfile->using_index)
10591 per_cu->v.quick->compunit_symtab = cust;
10594 struct partial_symtab *pst = per_cu->v.psymtab;
10595 pst->compunit_symtab = cust;
10600 /* Process an imported unit DIE. */
10603 process_imported_unit_die (struct die_info *die, struct dwarf2_cu *cu)
10605 struct attribute *attr;
10607 /* For now we don't handle imported units in type units. */
10608 if (cu->per_cu->is_debug_types)
10610 error (_("Dwarf Error: DW_TAG_imported_unit is not"
10611 " supported in type units [in module %s]"),
10612 objfile_name (cu->per_cu->dwarf2_per_objfile->objfile));
10615 attr = dwarf2_attr (die, DW_AT_import, cu);
10618 sect_offset sect_off = dwarf2_get_ref_die_offset (attr);
10619 bool is_dwz = (attr->form == DW_FORM_GNU_ref_alt || cu->per_cu->is_dwz);
10620 dwarf2_per_cu_data *per_cu
10621 = dwarf2_find_containing_comp_unit (sect_off, is_dwz,
10622 cu->per_cu->dwarf2_per_objfile);
10624 /* If necessary, add it to the queue and load its DIEs. */
10625 if (maybe_queue_comp_unit (cu, per_cu, cu->language))
10626 load_full_comp_unit (per_cu, cu->language);
10628 VEC_safe_push (dwarf2_per_cu_ptr, cu->per_cu->imported_symtabs,
10633 /* RAII object that represents a process_die scope: i.e.,
10634 starts/finishes processing a DIE. */
10635 class process_die_scope
10638 process_die_scope (die_info *die, dwarf2_cu *cu)
10639 : m_die (die), m_cu (cu)
10641 /* We should only be processing DIEs not already in process. */
10642 gdb_assert (!m_die->in_process);
10643 m_die->in_process = true;
10646 ~process_die_scope ()
10648 m_die->in_process = false;
10650 /* If we're done processing the DIE for the CU that owns the line
10651 header, we don't need the line header anymore. */
10652 if (m_cu->line_header_die_owner == m_die)
10654 delete m_cu->line_header;
10655 m_cu->line_header = NULL;
10656 m_cu->line_header_die_owner = NULL;
10665 /* Process a die and its children. */
10668 process_die (struct die_info *die, struct dwarf2_cu *cu)
10670 process_die_scope scope (die, cu);
10674 case DW_TAG_padding:
10676 case DW_TAG_compile_unit:
10677 case DW_TAG_partial_unit:
10678 read_file_scope (die, cu);
10680 case DW_TAG_type_unit:
10681 read_type_unit_scope (die, cu);
10683 case DW_TAG_subprogram:
10684 case DW_TAG_inlined_subroutine:
10685 read_func_scope (die, cu);
10687 case DW_TAG_lexical_block:
10688 case DW_TAG_try_block:
10689 case DW_TAG_catch_block:
10690 read_lexical_block_scope (die, cu);
10692 case DW_TAG_call_site:
10693 case DW_TAG_GNU_call_site:
10694 read_call_site_scope (die, cu);
10696 case DW_TAG_class_type:
10697 case DW_TAG_interface_type:
10698 case DW_TAG_structure_type:
10699 case DW_TAG_union_type:
10700 process_structure_scope (die, cu);
10702 case DW_TAG_enumeration_type:
10703 process_enumeration_scope (die, cu);
10706 /* These dies have a type, but processing them does not create
10707 a symbol or recurse to process the children. Therefore we can
10708 read them on-demand through read_type_die. */
10709 case DW_TAG_subroutine_type:
10710 case DW_TAG_set_type:
10711 case DW_TAG_array_type:
10712 case DW_TAG_pointer_type:
10713 case DW_TAG_ptr_to_member_type:
10714 case DW_TAG_reference_type:
10715 case DW_TAG_rvalue_reference_type:
10716 case DW_TAG_string_type:
10719 case DW_TAG_base_type:
10720 case DW_TAG_subrange_type:
10721 case DW_TAG_typedef:
10722 /* Add a typedef symbol for the type definition, if it has a
10724 new_symbol (die, read_type_die (die, cu), cu);
10726 case DW_TAG_common_block:
10727 read_common_block (die, cu);
10729 case DW_TAG_common_inclusion:
10731 case DW_TAG_namespace:
10732 cu->processing_has_namespace_info = 1;
10733 read_namespace (die, cu);
10735 case DW_TAG_module:
10736 cu->processing_has_namespace_info = 1;
10737 read_module (die, cu);
10739 case DW_TAG_imported_declaration:
10740 cu->processing_has_namespace_info = 1;
10741 if (read_namespace_alias (die, cu))
10743 /* The declaration is not a global namespace alias: fall through. */
10744 case DW_TAG_imported_module:
10745 cu->processing_has_namespace_info = 1;
10746 if (die->child != NULL && (die->tag == DW_TAG_imported_declaration
10747 || cu->language != language_fortran))
10748 complaint (&symfile_complaints, _("Tag '%s' has unexpected children"),
10749 dwarf_tag_name (die->tag));
10750 read_import_statement (die, cu);
10753 case DW_TAG_imported_unit:
10754 process_imported_unit_die (die, cu);
10757 case DW_TAG_variable:
10758 read_variable (die, cu);
10762 new_symbol (die, NULL, cu);
10767 /* DWARF name computation. */
10769 /* A helper function for dwarf2_compute_name which determines whether DIE
10770 needs to have the name of the scope prepended to the name listed in the
10774 die_needs_namespace (struct die_info *die, struct dwarf2_cu *cu)
10776 struct attribute *attr;
10780 case DW_TAG_namespace:
10781 case DW_TAG_typedef:
10782 case DW_TAG_class_type:
10783 case DW_TAG_interface_type:
10784 case DW_TAG_structure_type:
10785 case DW_TAG_union_type:
10786 case DW_TAG_enumeration_type:
10787 case DW_TAG_enumerator:
10788 case DW_TAG_subprogram:
10789 case DW_TAG_inlined_subroutine:
10790 case DW_TAG_member:
10791 case DW_TAG_imported_declaration:
10794 case DW_TAG_variable:
10795 case DW_TAG_constant:
10796 /* We only need to prefix "globally" visible variables. These include
10797 any variable marked with DW_AT_external or any variable that
10798 lives in a namespace. [Variables in anonymous namespaces
10799 require prefixing, but they are not DW_AT_external.] */
10801 if (dwarf2_attr (die, DW_AT_specification, cu))
10803 struct dwarf2_cu *spec_cu = cu;
10805 return die_needs_namespace (die_specification (die, &spec_cu),
10809 attr = dwarf2_attr (die, DW_AT_external, cu);
10810 if (attr == NULL && die->parent->tag != DW_TAG_namespace
10811 && die->parent->tag != DW_TAG_module)
10813 /* A variable in a lexical block of some kind does not need a
10814 namespace, even though in C++ such variables may be external
10815 and have a mangled name. */
10816 if (die->parent->tag == DW_TAG_lexical_block
10817 || die->parent->tag == DW_TAG_try_block
10818 || die->parent->tag == DW_TAG_catch_block
10819 || die->parent->tag == DW_TAG_subprogram)
10828 /* Return the DIE's linkage name attribute, either DW_AT_linkage_name
10829 or DW_AT_MIPS_linkage_name. Returns NULL if the attribute is not
10830 defined for the given DIE. */
10832 static struct attribute *
10833 dw2_linkage_name_attr (struct die_info *die, struct dwarf2_cu *cu)
10835 struct attribute *attr;
10837 attr = dwarf2_attr (die, DW_AT_linkage_name, cu);
10839 attr = dwarf2_attr (die, DW_AT_MIPS_linkage_name, cu);
10844 /* Return the DIE's linkage name as a string, either DW_AT_linkage_name
10845 or DW_AT_MIPS_linkage_name. Returns NULL if the attribute is not
10846 defined for the given DIE. */
10848 static const char *
10849 dw2_linkage_name (struct die_info *die, struct dwarf2_cu *cu)
10851 const char *linkage_name;
10853 linkage_name = dwarf2_string_attr (die, DW_AT_linkage_name, cu);
10854 if (linkage_name == NULL)
10855 linkage_name = dwarf2_string_attr (die, DW_AT_MIPS_linkage_name, cu);
10857 return linkage_name;
10860 /* Compute the fully qualified name of DIE in CU. If PHYSNAME is nonzero,
10861 compute the physname for the object, which include a method's:
10862 - formal parameters (C++),
10863 - receiver type (Go),
10865 The term "physname" is a bit confusing.
10866 For C++, for example, it is the demangled name.
10867 For Go, for example, it's the mangled name.
10869 For Ada, return the DIE's linkage name rather than the fully qualified
10870 name. PHYSNAME is ignored..
10872 The result is allocated on the objfile_obstack and canonicalized. */
10874 static const char *
10875 dwarf2_compute_name (const char *name,
10876 struct die_info *die, struct dwarf2_cu *cu,
10879 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
10882 name = dwarf2_name (die, cu);
10884 /* For Fortran GDB prefers DW_AT_*linkage_name for the physname if present
10885 but otherwise compute it by typename_concat inside GDB.
10886 FIXME: Actually this is not really true, or at least not always true.
10887 It's all very confusing. SYMBOL_SET_NAMES doesn't try to demangle
10888 Fortran names because there is no mangling standard. So new_symbol
10889 will set the demangled name to the result of dwarf2_full_name, and it is
10890 the demangled name that GDB uses if it exists. */
10891 if (cu->language == language_ada
10892 || (cu->language == language_fortran && physname))
10894 /* For Ada unit, we prefer the linkage name over the name, as
10895 the former contains the exported name, which the user expects
10896 to be able to reference. Ideally, we want the user to be able
10897 to reference this entity using either natural or linkage name,
10898 but we haven't started looking at this enhancement yet. */
10899 const char *linkage_name = dw2_linkage_name (die, cu);
10901 if (linkage_name != NULL)
10902 return linkage_name;
10905 /* These are the only languages we know how to qualify names in. */
10907 && (cu->language == language_cplus
10908 || cu->language == language_fortran || cu->language == language_d
10909 || cu->language == language_rust))
10911 if (die_needs_namespace (die, cu))
10913 const char *prefix;
10914 const char *canonical_name = NULL;
10918 prefix = determine_prefix (die, cu);
10919 if (*prefix != '\0')
10921 char *prefixed_name = typename_concat (NULL, prefix, name,
10924 buf.puts (prefixed_name);
10925 xfree (prefixed_name);
10930 /* Template parameters may be specified in the DIE's DW_AT_name, or
10931 as children with DW_TAG_template_type_param or
10932 DW_TAG_value_type_param. If the latter, add them to the name
10933 here. If the name already has template parameters, then
10934 skip this step; some versions of GCC emit both, and
10935 it is more efficient to use the pre-computed name.
10937 Something to keep in mind about this process: it is very
10938 unlikely, or in some cases downright impossible, to produce
10939 something that will match the mangled name of a function.
10940 If the definition of the function has the same debug info,
10941 we should be able to match up with it anyway. But fallbacks
10942 using the minimal symbol, for instance to find a method
10943 implemented in a stripped copy of libstdc++, will not work.
10944 If we do not have debug info for the definition, we will have to
10945 match them up some other way.
10947 When we do name matching there is a related problem with function
10948 templates; two instantiated function templates are allowed to
10949 differ only by their return types, which we do not add here. */
10951 if (cu->language == language_cplus && strchr (name, '<') == NULL)
10953 struct attribute *attr;
10954 struct die_info *child;
10957 die->building_fullname = 1;
10959 for (child = die->child; child != NULL; child = child->sibling)
10963 const gdb_byte *bytes;
10964 struct dwarf2_locexpr_baton *baton;
10967 if (child->tag != DW_TAG_template_type_param
10968 && child->tag != DW_TAG_template_value_param)
10979 attr = dwarf2_attr (child, DW_AT_type, cu);
10982 complaint (&symfile_complaints,
10983 _("template parameter missing DW_AT_type"));
10984 buf.puts ("UNKNOWN_TYPE");
10987 type = die_type (child, cu);
10989 if (child->tag == DW_TAG_template_type_param)
10991 c_print_type (type, "", &buf, -1, 0, &type_print_raw_options);
10995 attr = dwarf2_attr (child, DW_AT_const_value, cu);
10998 complaint (&symfile_complaints,
10999 _("template parameter missing "
11000 "DW_AT_const_value"));
11001 buf.puts ("UNKNOWN_VALUE");
11005 dwarf2_const_value_attr (attr, type, name,
11006 &cu->comp_unit_obstack, cu,
11007 &value, &bytes, &baton);
11009 if (TYPE_NOSIGN (type))
11010 /* GDB prints characters as NUMBER 'CHAR'. If that's
11011 changed, this can use value_print instead. */
11012 c_printchar (value, type, &buf);
11015 struct value_print_options opts;
11018 v = dwarf2_evaluate_loc_desc (type, NULL,
11022 else if (bytes != NULL)
11024 v = allocate_value (type);
11025 memcpy (value_contents_writeable (v), bytes,
11026 TYPE_LENGTH (type));
11029 v = value_from_longest (type, value);
11031 /* Specify decimal so that we do not depend on
11033 get_formatted_print_options (&opts, 'd');
11035 value_print (v, &buf, &opts);
11041 die->building_fullname = 0;
11045 /* Close the argument list, with a space if necessary
11046 (nested templates). */
11047 if (!buf.empty () && buf.string ().back () == '>')
11054 /* For C++ methods, append formal parameter type
11055 information, if PHYSNAME. */
11057 if (physname && die->tag == DW_TAG_subprogram
11058 && cu->language == language_cplus)
11060 struct type *type = read_type_die (die, cu);
11062 c_type_print_args (type, &buf, 1, cu->language,
11063 &type_print_raw_options);
11065 if (cu->language == language_cplus)
11067 /* Assume that an artificial first parameter is
11068 "this", but do not crash if it is not. RealView
11069 marks unnamed (and thus unused) parameters as
11070 artificial; there is no way to differentiate
11072 if (TYPE_NFIELDS (type) > 0
11073 && TYPE_FIELD_ARTIFICIAL (type, 0)
11074 && TYPE_CODE (TYPE_FIELD_TYPE (type, 0)) == TYPE_CODE_PTR
11075 && TYPE_CONST (TYPE_TARGET_TYPE (TYPE_FIELD_TYPE (type,
11077 buf.puts (" const");
11081 const std::string &intermediate_name = buf.string ();
11083 if (cu->language == language_cplus)
11085 = dwarf2_canonicalize_name (intermediate_name.c_str (), cu,
11086 &objfile->per_bfd->storage_obstack);
11088 /* If we only computed INTERMEDIATE_NAME, or if
11089 INTERMEDIATE_NAME is already canonical, then we need to
11090 copy it to the appropriate obstack. */
11091 if (canonical_name == NULL || canonical_name == intermediate_name.c_str ())
11092 name = ((const char *)
11093 obstack_copy0 (&objfile->per_bfd->storage_obstack,
11094 intermediate_name.c_str (),
11095 intermediate_name.length ()));
11097 name = canonical_name;
11104 /* Return the fully qualified name of DIE, based on its DW_AT_name.
11105 If scope qualifiers are appropriate they will be added. The result
11106 will be allocated on the storage_obstack, or NULL if the DIE does
11107 not have a name. NAME may either be from a previous call to
11108 dwarf2_name or NULL.
11110 The output string will be canonicalized (if C++). */
11112 static const char *
11113 dwarf2_full_name (const char *name, struct die_info *die, struct dwarf2_cu *cu)
11115 return dwarf2_compute_name (name, die, cu, 0);
11118 /* Construct a physname for the given DIE in CU. NAME may either be
11119 from a previous call to dwarf2_name or NULL. The result will be
11120 allocated on the objfile_objstack or NULL if the DIE does not have a
11123 The output string will be canonicalized (if C++). */
11125 static const char *
11126 dwarf2_physname (const char *name, struct die_info *die, struct dwarf2_cu *cu)
11128 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
11129 const char *retval, *mangled = NULL, *canon = NULL;
11132 /* In this case dwarf2_compute_name is just a shortcut not building anything
11134 if (!die_needs_namespace (die, cu))
11135 return dwarf2_compute_name (name, die, cu, 1);
11137 mangled = dw2_linkage_name (die, cu);
11139 /* rustc emits invalid values for DW_AT_linkage_name. Ignore these.
11140 See https://github.com/rust-lang/rust/issues/32925. */
11141 if (cu->language == language_rust && mangled != NULL
11142 && strchr (mangled, '{') != NULL)
11145 /* DW_AT_linkage_name is missing in some cases - depend on what GDB
11147 gdb::unique_xmalloc_ptr<char> demangled;
11148 if (mangled != NULL)
11151 if (cu->language == language_go)
11153 /* This is a lie, but we already lie to the caller new_symbol.
11154 new_symbol assumes we return the mangled name.
11155 This just undoes that lie until things are cleaned up. */
11159 /* Use DMGL_RET_DROP for C++ template functions to suppress
11160 their return type. It is easier for GDB users to search
11161 for such functions as `name(params)' than `long name(params)'.
11162 In such case the minimal symbol names do not match the full
11163 symbol names but for template functions there is never a need
11164 to look up their definition from their declaration so
11165 the only disadvantage remains the minimal symbol variant
11166 `long name(params)' does not have the proper inferior type. */
11167 demangled.reset (gdb_demangle (mangled,
11168 (DMGL_PARAMS | DMGL_ANSI
11169 | DMGL_RET_DROP)));
11172 canon = demangled.get ();
11180 if (canon == NULL || check_physname)
11182 const char *physname = dwarf2_compute_name (name, die, cu, 1);
11184 if (canon != NULL && strcmp (physname, canon) != 0)
11186 /* It may not mean a bug in GDB. The compiler could also
11187 compute DW_AT_linkage_name incorrectly. But in such case
11188 GDB would need to be bug-to-bug compatible. */
11190 complaint (&symfile_complaints,
11191 _("Computed physname <%s> does not match demangled <%s> "
11192 "(from linkage <%s>) - DIE at 0x%x [in module %s]"),
11193 physname, canon, mangled, to_underlying (die->sect_off),
11194 objfile_name (objfile));
11196 /* Prefer DW_AT_linkage_name (in the CANON form) - when it
11197 is available here - over computed PHYSNAME. It is safer
11198 against both buggy GDB and buggy compilers. */
11212 retval = ((const char *)
11213 obstack_copy0 (&objfile->per_bfd->storage_obstack,
11214 retval, strlen (retval)));
11219 /* Inspect DIE in CU for a namespace alias. If one exists, record
11220 a new symbol for it.
11222 Returns 1 if a namespace alias was recorded, 0 otherwise. */
11225 read_namespace_alias (struct die_info *die, struct dwarf2_cu *cu)
11227 struct attribute *attr;
11229 /* If the die does not have a name, this is not a namespace
11231 attr = dwarf2_attr (die, DW_AT_name, cu);
11235 struct die_info *d = die;
11236 struct dwarf2_cu *imported_cu = cu;
11238 /* If the compiler has nested DW_AT_imported_declaration DIEs,
11239 keep inspecting DIEs until we hit the underlying import. */
11240 #define MAX_NESTED_IMPORTED_DECLARATIONS 100
11241 for (num = 0; num < MAX_NESTED_IMPORTED_DECLARATIONS; ++num)
11243 attr = dwarf2_attr (d, DW_AT_import, cu);
11247 d = follow_die_ref (d, attr, &imported_cu);
11248 if (d->tag != DW_TAG_imported_declaration)
11252 if (num == MAX_NESTED_IMPORTED_DECLARATIONS)
11254 complaint (&symfile_complaints,
11255 _("DIE at 0x%x has too many recursively imported "
11256 "declarations"), to_underlying (d->sect_off));
11263 sect_offset sect_off = dwarf2_get_ref_die_offset (attr);
11265 type = get_die_type_at_offset (sect_off, cu->per_cu);
11266 if (type != NULL && TYPE_CODE (type) == TYPE_CODE_NAMESPACE)
11268 /* This declaration is a global namespace alias. Add
11269 a symbol for it whose type is the aliased namespace. */
11270 new_symbol (die, type, cu);
11279 /* Return the using directives repository (global or local?) to use in the
11280 current context for LANGUAGE.
11282 For Ada, imported declarations can materialize renamings, which *may* be
11283 global. However it is impossible (for now?) in DWARF to distinguish
11284 "external" imported declarations and "static" ones. As all imported
11285 declarations seem to be static in all other languages, make them all CU-wide
11286 global only in Ada. */
11288 static struct using_direct **
11289 using_directives (enum language language)
11291 if (language == language_ada && context_stack_depth == 0)
11292 return &global_using_directives;
11294 return &local_using_directives;
11297 /* Read the import statement specified by the given die and record it. */
11300 read_import_statement (struct die_info *die, struct dwarf2_cu *cu)
11302 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
11303 struct attribute *import_attr;
11304 struct die_info *imported_die, *child_die;
11305 struct dwarf2_cu *imported_cu;
11306 const char *imported_name;
11307 const char *imported_name_prefix;
11308 const char *canonical_name;
11309 const char *import_alias;
11310 const char *imported_declaration = NULL;
11311 const char *import_prefix;
11312 std::vector<const char *> excludes;
11314 import_attr = dwarf2_attr (die, DW_AT_import, cu);
11315 if (import_attr == NULL)
11317 complaint (&symfile_complaints, _("Tag '%s' has no DW_AT_import"),
11318 dwarf_tag_name (die->tag));
11323 imported_die = follow_die_ref_or_sig (die, import_attr, &imported_cu);
11324 imported_name = dwarf2_name (imported_die, imported_cu);
11325 if (imported_name == NULL)
11327 /* GCC bug: https://bugzilla.redhat.com/show_bug.cgi?id=506524
11329 The import in the following code:
11343 <2><51>: Abbrev Number: 3 (DW_TAG_imported_declaration)
11344 <52> DW_AT_decl_file : 1
11345 <53> DW_AT_decl_line : 6
11346 <54> DW_AT_import : <0x75>
11347 <2><58>: Abbrev Number: 4 (DW_TAG_typedef)
11348 <59> DW_AT_name : B
11349 <5b> DW_AT_decl_file : 1
11350 <5c> DW_AT_decl_line : 2
11351 <5d> DW_AT_type : <0x6e>
11353 <1><75>: Abbrev Number: 7 (DW_TAG_base_type)
11354 <76> DW_AT_byte_size : 4
11355 <77> DW_AT_encoding : 5 (signed)
11357 imports the wrong die ( 0x75 instead of 0x58 ).
11358 This case will be ignored until the gcc bug is fixed. */
11362 /* Figure out the local name after import. */
11363 import_alias = dwarf2_name (die, cu);
11365 /* Figure out where the statement is being imported to. */
11366 import_prefix = determine_prefix (die, cu);
11368 /* Figure out what the scope of the imported die is and prepend it
11369 to the name of the imported die. */
11370 imported_name_prefix = determine_prefix (imported_die, imported_cu);
11372 if (imported_die->tag != DW_TAG_namespace
11373 && imported_die->tag != DW_TAG_module)
11375 imported_declaration = imported_name;
11376 canonical_name = imported_name_prefix;
11378 else if (strlen (imported_name_prefix) > 0)
11379 canonical_name = obconcat (&objfile->objfile_obstack,
11380 imported_name_prefix,
11381 (cu->language == language_d ? "." : "::"),
11382 imported_name, (char *) NULL);
11384 canonical_name = imported_name;
11386 if (die->tag == DW_TAG_imported_module && cu->language == language_fortran)
11387 for (child_die = die->child; child_die && child_die->tag;
11388 child_die = sibling_die (child_die))
11390 /* DWARF-4: A Fortran use statement with a “rename list” may be
11391 represented by an imported module entry with an import attribute
11392 referring to the module and owned entries corresponding to those
11393 entities that are renamed as part of being imported. */
11395 if (child_die->tag != DW_TAG_imported_declaration)
11397 complaint (&symfile_complaints,
11398 _("child DW_TAG_imported_declaration expected "
11399 "- DIE at 0x%x [in module %s]"),
11400 to_underlying (child_die->sect_off), objfile_name (objfile));
11404 import_attr = dwarf2_attr (child_die, DW_AT_import, cu);
11405 if (import_attr == NULL)
11407 complaint (&symfile_complaints, _("Tag '%s' has no DW_AT_import"),
11408 dwarf_tag_name (child_die->tag));
11413 imported_die = follow_die_ref_or_sig (child_die, import_attr,
11415 imported_name = dwarf2_name (imported_die, imported_cu);
11416 if (imported_name == NULL)
11418 complaint (&symfile_complaints,
11419 _("child DW_TAG_imported_declaration has unknown "
11420 "imported name - DIE at 0x%x [in module %s]"),
11421 to_underlying (child_die->sect_off), objfile_name (objfile));
11425 excludes.push_back (imported_name);
11427 process_die (child_die, cu);
11430 add_using_directive (using_directives (cu->language),
11434 imported_declaration,
11437 &objfile->objfile_obstack);
11440 /* ICC<14 does not output the required DW_AT_declaration on incomplete
11441 types, but gives them a size of zero. Starting with version 14,
11442 ICC is compatible with GCC. */
11445 producer_is_icc_lt_14 (struct dwarf2_cu *cu)
11447 if (!cu->checked_producer)
11448 check_producer (cu);
11450 return cu->producer_is_icc_lt_14;
11453 /* Check for possibly missing DW_AT_comp_dir with relative .debug_line
11454 directory paths. GCC SVN r127613 (new option -fdebug-prefix-map) fixed
11455 this, it was first present in GCC release 4.3.0. */
11458 producer_is_gcc_lt_4_3 (struct dwarf2_cu *cu)
11460 if (!cu->checked_producer)
11461 check_producer (cu);
11463 return cu->producer_is_gcc_lt_4_3;
11466 static file_and_directory
11467 find_file_and_directory (struct die_info *die, struct dwarf2_cu *cu)
11469 file_and_directory res;
11471 /* Find the filename. Do not use dwarf2_name here, since the filename
11472 is not a source language identifier. */
11473 res.name = dwarf2_string_attr (die, DW_AT_name, cu);
11474 res.comp_dir = dwarf2_string_attr (die, DW_AT_comp_dir, cu);
11476 if (res.comp_dir == NULL
11477 && producer_is_gcc_lt_4_3 (cu) && res.name != NULL
11478 && IS_ABSOLUTE_PATH (res.name))
11480 res.comp_dir_storage = ldirname (res.name);
11481 if (!res.comp_dir_storage.empty ())
11482 res.comp_dir = res.comp_dir_storage.c_str ();
11484 if (res.comp_dir != NULL)
11486 /* Irix 6.2 native cc prepends <machine>.: to the compilation
11487 directory, get rid of it. */
11488 const char *cp = strchr (res.comp_dir, ':');
11490 if (cp && cp != res.comp_dir && cp[-1] == '.' && cp[1] == '/')
11491 res.comp_dir = cp + 1;
11494 if (res.name == NULL)
11495 res.name = "<unknown>";
11500 /* Handle DW_AT_stmt_list for a compilation unit.
11501 DIE is the DW_TAG_compile_unit die for CU.
11502 COMP_DIR is the compilation directory. LOWPC is passed to
11503 dwarf_decode_lines. See dwarf_decode_lines comments about it. */
11506 handle_DW_AT_stmt_list (struct die_info *die, struct dwarf2_cu *cu,
11507 const char *comp_dir, CORE_ADDR lowpc) /* ARI: editCase function */
11509 struct dwarf2_per_objfile *dwarf2_per_objfile
11510 = cu->per_cu->dwarf2_per_objfile;
11511 struct objfile *objfile = dwarf2_per_objfile->objfile;
11512 struct attribute *attr;
11513 struct line_header line_header_local;
11514 hashval_t line_header_local_hash;
11516 int decode_mapping;
11518 gdb_assert (! cu->per_cu->is_debug_types);
11520 attr = dwarf2_attr (die, DW_AT_stmt_list, cu);
11524 sect_offset line_offset = (sect_offset) DW_UNSND (attr);
11526 /* The line header hash table is only created if needed (it exists to
11527 prevent redundant reading of the line table for partial_units).
11528 If we're given a partial_unit, we'll need it. If we're given a
11529 compile_unit, then use the line header hash table if it's already
11530 created, but don't create one just yet. */
11532 if (dwarf2_per_objfile->line_header_hash == NULL
11533 && die->tag == DW_TAG_partial_unit)
11535 dwarf2_per_objfile->line_header_hash
11536 = htab_create_alloc_ex (127, line_header_hash_voidp,
11537 line_header_eq_voidp,
11538 free_line_header_voidp,
11539 &objfile->objfile_obstack,
11540 hashtab_obstack_allocate,
11541 dummy_obstack_deallocate);
11544 line_header_local.sect_off = line_offset;
11545 line_header_local.offset_in_dwz = cu->per_cu->is_dwz;
11546 line_header_local_hash = line_header_hash (&line_header_local);
11547 if (dwarf2_per_objfile->line_header_hash != NULL)
11549 slot = htab_find_slot_with_hash (dwarf2_per_objfile->line_header_hash,
11550 &line_header_local,
11551 line_header_local_hash, NO_INSERT);
11553 /* For DW_TAG_compile_unit we need info like symtab::linetable which
11554 is not present in *SLOT (since if there is something in *SLOT then
11555 it will be for a partial_unit). */
11556 if (die->tag == DW_TAG_partial_unit && slot != NULL)
11558 gdb_assert (*slot != NULL);
11559 cu->line_header = (struct line_header *) *slot;
11564 /* dwarf_decode_line_header does not yet provide sufficient information.
11565 We always have to call also dwarf_decode_lines for it. */
11566 line_header_up lh = dwarf_decode_line_header (line_offset, cu);
11570 cu->line_header = lh.release ();
11571 cu->line_header_die_owner = die;
11573 if (dwarf2_per_objfile->line_header_hash == NULL)
11577 slot = htab_find_slot_with_hash (dwarf2_per_objfile->line_header_hash,
11578 &line_header_local,
11579 line_header_local_hash, INSERT);
11580 gdb_assert (slot != NULL);
11582 if (slot != NULL && *slot == NULL)
11584 /* This newly decoded line number information unit will be owned
11585 by line_header_hash hash table. */
11586 *slot = cu->line_header;
11587 cu->line_header_die_owner = NULL;
11591 /* We cannot free any current entry in (*slot) as that struct line_header
11592 may be already used by multiple CUs. Create only temporary decoded
11593 line_header for this CU - it may happen at most once for each line
11594 number information unit. And if we're not using line_header_hash
11595 then this is what we want as well. */
11596 gdb_assert (die->tag != DW_TAG_partial_unit);
11598 decode_mapping = (die->tag != DW_TAG_partial_unit);
11599 dwarf_decode_lines (cu->line_header, comp_dir, cu, NULL, lowpc,
11604 /* Process DW_TAG_compile_unit or DW_TAG_partial_unit. */
11607 read_file_scope (struct die_info *die, struct dwarf2_cu *cu)
11609 struct dwarf2_per_objfile *dwarf2_per_objfile
11610 = cu->per_cu->dwarf2_per_objfile;
11611 struct objfile *objfile = dwarf2_per_objfile->objfile;
11612 struct gdbarch *gdbarch = get_objfile_arch (objfile);
11613 CORE_ADDR lowpc = ((CORE_ADDR) -1);
11614 CORE_ADDR highpc = ((CORE_ADDR) 0);
11615 struct attribute *attr;
11616 struct die_info *child_die;
11617 CORE_ADDR baseaddr;
11619 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
11621 get_scope_pc_bounds (die, &lowpc, &highpc, cu);
11623 /* If we didn't find a lowpc, set it to highpc to avoid complaints
11624 from finish_block. */
11625 if (lowpc == ((CORE_ADDR) -1))
11627 lowpc = gdbarch_adjust_dwarf2_addr (gdbarch, lowpc + baseaddr);
11629 file_and_directory fnd = find_file_and_directory (die, cu);
11631 prepare_one_comp_unit (cu, die, cu->language);
11633 /* The XLCL doesn't generate DW_LANG_OpenCL because this attribute is not
11634 standardised yet. As a workaround for the language detection we fall
11635 back to the DW_AT_producer string. */
11636 if (cu->producer && strstr (cu->producer, "IBM XL C for OpenCL") != NULL)
11637 cu->language = language_opencl;
11639 /* Similar hack for Go. */
11640 if (cu->producer && strstr (cu->producer, "GNU Go ") != NULL)
11641 set_cu_language (DW_LANG_Go, cu);
11643 dwarf2_start_symtab (cu, fnd.name, fnd.comp_dir, lowpc);
11645 /* Decode line number information if present. We do this before
11646 processing child DIEs, so that the line header table is available
11647 for DW_AT_decl_file. */
11648 handle_DW_AT_stmt_list (die, cu, fnd.comp_dir, lowpc);
11650 /* Process all dies in compilation unit. */
11651 if (die->child != NULL)
11653 child_die = die->child;
11654 while (child_die && child_die->tag)
11656 process_die (child_die, cu);
11657 child_die = sibling_die (child_die);
11661 /* Decode macro information, if present. Dwarf 2 macro information
11662 refers to information in the line number info statement program
11663 header, so we can only read it if we've read the header
11665 attr = dwarf2_attr (die, DW_AT_macros, cu);
11667 attr = dwarf2_attr (die, DW_AT_GNU_macros, cu);
11668 if (attr && cu->line_header)
11670 if (dwarf2_attr (die, DW_AT_macro_info, cu))
11671 complaint (&symfile_complaints,
11672 _("CU refers to both DW_AT_macros and DW_AT_macro_info"));
11674 dwarf_decode_macros (cu, DW_UNSND (attr), 1);
11678 attr = dwarf2_attr (die, DW_AT_macro_info, cu);
11679 if (attr && cu->line_header)
11681 unsigned int macro_offset = DW_UNSND (attr);
11683 dwarf_decode_macros (cu, macro_offset, 0);
11688 /* TU version of handle_DW_AT_stmt_list for read_type_unit_scope.
11689 Create the set of symtabs used by this TU, or if this TU is sharing
11690 symtabs with another TU and the symtabs have already been created
11691 then restore those symtabs in the line header.
11692 We don't need the pc/line-number mapping for type units. */
11695 setup_type_unit_groups (struct die_info *die, struct dwarf2_cu *cu)
11697 struct dwarf2_per_cu_data *per_cu = cu->per_cu;
11698 struct type_unit_group *tu_group;
11700 struct attribute *attr;
11702 struct signatured_type *sig_type;
11704 gdb_assert (per_cu->is_debug_types);
11705 sig_type = (struct signatured_type *) per_cu;
11707 attr = dwarf2_attr (die, DW_AT_stmt_list, cu);
11709 /* If we're using .gdb_index (includes -readnow) then
11710 per_cu->type_unit_group may not have been set up yet. */
11711 if (sig_type->type_unit_group == NULL)
11712 sig_type->type_unit_group = get_type_unit_group (cu, attr);
11713 tu_group = sig_type->type_unit_group;
11715 /* If we've already processed this stmt_list there's no real need to
11716 do it again, we could fake it and just recreate the part we need
11717 (file name,index -> symtab mapping). If data shows this optimization
11718 is useful we can do it then. */
11719 first_time = tu_group->compunit_symtab == NULL;
11721 /* We have to handle the case of both a missing DW_AT_stmt_list or bad
11726 sect_offset line_offset = (sect_offset) DW_UNSND (attr);
11727 lh = dwarf_decode_line_header (line_offset, cu);
11732 dwarf2_start_symtab (cu, "", NULL, 0);
11735 gdb_assert (tu_group->symtabs == NULL);
11736 restart_symtab (tu_group->compunit_symtab, "", 0);
11741 cu->line_header = lh.release ();
11742 cu->line_header_die_owner = die;
11746 struct compunit_symtab *cust = dwarf2_start_symtab (cu, "", NULL, 0);
11748 /* Note: We don't assign tu_group->compunit_symtab yet because we're
11749 still initializing it, and our caller (a few levels up)
11750 process_full_type_unit still needs to know if this is the first
11753 tu_group->num_symtabs = cu->line_header->file_names.size ();
11754 tu_group->symtabs = XNEWVEC (struct symtab *,
11755 cu->line_header->file_names.size ());
11757 for (i = 0; i < cu->line_header->file_names.size (); ++i)
11759 file_entry &fe = cu->line_header->file_names[i];
11761 dwarf2_start_subfile (fe.name, fe.include_dir (cu->line_header));
11763 if (current_subfile->symtab == NULL)
11765 /* NOTE: start_subfile will recognize when it's been
11766 passed a file it has already seen. So we can't
11767 assume there's a simple mapping from
11768 cu->line_header->file_names to subfiles, plus
11769 cu->line_header->file_names may contain dups. */
11770 current_subfile->symtab
11771 = allocate_symtab (cust, current_subfile->name);
11774 fe.symtab = current_subfile->symtab;
11775 tu_group->symtabs[i] = fe.symtab;
11780 restart_symtab (tu_group->compunit_symtab, "", 0);
11782 for (i = 0; i < cu->line_header->file_names.size (); ++i)
11784 file_entry &fe = cu->line_header->file_names[i];
11786 fe.symtab = tu_group->symtabs[i];
11790 /* The main symtab is allocated last. Type units don't have DW_AT_name
11791 so they don't have a "real" (so to speak) symtab anyway.
11792 There is later code that will assign the main symtab to all symbols
11793 that don't have one. We need to handle the case of a symbol with a
11794 missing symtab (DW_AT_decl_file) anyway. */
11797 /* Process DW_TAG_type_unit.
11798 For TUs we want to skip the first top level sibling if it's not the
11799 actual type being defined by this TU. In this case the first top
11800 level sibling is there to provide context only. */
11803 read_type_unit_scope (struct die_info *die, struct dwarf2_cu *cu)
11805 struct die_info *child_die;
11807 prepare_one_comp_unit (cu, die, language_minimal);
11809 /* Initialize (or reinitialize) the machinery for building symtabs.
11810 We do this before processing child DIEs, so that the line header table
11811 is available for DW_AT_decl_file. */
11812 setup_type_unit_groups (die, cu);
11814 if (die->child != NULL)
11816 child_die = die->child;
11817 while (child_die && child_die->tag)
11819 process_die (child_die, cu);
11820 child_die = sibling_die (child_die);
11827 http://gcc.gnu.org/wiki/DebugFission
11828 http://gcc.gnu.org/wiki/DebugFissionDWP
11830 To simplify handling of both DWO files ("object" files with the DWARF info)
11831 and DWP files (a file with the DWOs packaged up into one file), we treat
11832 DWP files as having a collection of virtual DWO files. */
11835 hash_dwo_file (const void *item)
11837 const struct dwo_file *dwo_file = (const struct dwo_file *) item;
11840 hash = htab_hash_string (dwo_file->dwo_name);
11841 if (dwo_file->comp_dir != NULL)
11842 hash += htab_hash_string (dwo_file->comp_dir);
11847 eq_dwo_file (const void *item_lhs, const void *item_rhs)
11849 const struct dwo_file *lhs = (const struct dwo_file *) item_lhs;
11850 const struct dwo_file *rhs = (const struct dwo_file *) item_rhs;
11852 if (strcmp (lhs->dwo_name, rhs->dwo_name) != 0)
11854 if (lhs->comp_dir == NULL || rhs->comp_dir == NULL)
11855 return lhs->comp_dir == rhs->comp_dir;
11856 return strcmp (lhs->comp_dir, rhs->comp_dir) == 0;
11859 /* Allocate a hash table for DWO files. */
11862 allocate_dwo_file_hash_table (struct objfile *objfile)
11864 return htab_create_alloc_ex (41,
11868 &objfile->objfile_obstack,
11869 hashtab_obstack_allocate,
11870 dummy_obstack_deallocate);
11873 /* Lookup DWO file DWO_NAME. */
11876 lookup_dwo_file_slot (struct dwarf2_per_objfile *dwarf2_per_objfile,
11877 const char *dwo_name,
11878 const char *comp_dir)
11880 struct dwo_file find_entry;
11883 if (dwarf2_per_objfile->dwo_files == NULL)
11884 dwarf2_per_objfile->dwo_files
11885 = allocate_dwo_file_hash_table (dwarf2_per_objfile->objfile);
11887 memset (&find_entry, 0, sizeof (find_entry));
11888 find_entry.dwo_name = dwo_name;
11889 find_entry.comp_dir = comp_dir;
11890 slot = htab_find_slot (dwarf2_per_objfile->dwo_files, &find_entry, INSERT);
11896 hash_dwo_unit (const void *item)
11898 const struct dwo_unit *dwo_unit = (const struct dwo_unit *) item;
11900 /* This drops the top 32 bits of the id, but is ok for a hash. */
11901 return dwo_unit->signature;
11905 eq_dwo_unit (const void *item_lhs, const void *item_rhs)
11907 const struct dwo_unit *lhs = (const struct dwo_unit *) item_lhs;
11908 const struct dwo_unit *rhs = (const struct dwo_unit *) item_rhs;
11910 /* The signature is assumed to be unique within the DWO file.
11911 So while object file CU dwo_id's always have the value zero,
11912 that's OK, assuming each object file DWO file has only one CU,
11913 and that's the rule for now. */
11914 return lhs->signature == rhs->signature;
11917 /* Allocate a hash table for DWO CUs,TUs.
11918 There is one of these tables for each of CUs,TUs for each DWO file. */
11921 allocate_dwo_unit_table (struct objfile *objfile)
11923 /* Start out with a pretty small number.
11924 Generally DWO files contain only one CU and maybe some TUs. */
11925 return htab_create_alloc_ex (3,
11929 &objfile->objfile_obstack,
11930 hashtab_obstack_allocate,
11931 dummy_obstack_deallocate);
11934 /* Structure used to pass data to create_dwo_debug_info_hash_table_reader. */
11936 struct create_dwo_cu_data
11938 struct dwo_file *dwo_file;
11939 struct dwo_unit dwo_unit;
11942 /* die_reader_func for create_dwo_cu. */
11945 create_dwo_cu_reader (const struct die_reader_specs *reader,
11946 const gdb_byte *info_ptr,
11947 struct die_info *comp_unit_die,
11951 struct dwarf2_cu *cu = reader->cu;
11952 sect_offset sect_off = cu->per_cu->sect_off;
11953 struct dwarf2_section_info *section = cu->per_cu->section;
11954 struct create_dwo_cu_data *data = (struct create_dwo_cu_data *) datap;
11955 struct dwo_file *dwo_file = data->dwo_file;
11956 struct dwo_unit *dwo_unit = &data->dwo_unit;
11957 struct attribute *attr;
11959 attr = dwarf2_attr (comp_unit_die, DW_AT_GNU_dwo_id, cu);
11962 complaint (&symfile_complaints,
11963 _("Dwarf Error: debug entry at offset 0x%x is missing"
11964 " its dwo_id [in module %s]"),
11965 to_underlying (sect_off), dwo_file->dwo_name);
11969 dwo_unit->dwo_file = dwo_file;
11970 dwo_unit->signature = DW_UNSND (attr);
11971 dwo_unit->section = section;
11972 dwo_unit->sect_off = sect_off;
11973 dwo_unit->length = cu->per_cu->length;
11975 if (dwarf_read_debug)
11976 fprintf_unfiltered (gdb_stdlog, " offset 0x%x, dwo_id %s\n",
11977 to_underlying (sect_off),
11978 hex_string (dwo_unit->signature));
11981 /* Create the dwo_units for the CUs in a DWO_FILE.
11982 Note: This function processes DWO files only, not DWP files. */
11985 create_cus_hash_table (struct dwarf2_per_objfile *dwarf2_per_objfile,
11986 struct dwo_file &dwo_file, dwarf2_section_info §ion,
11989 struct objfile *objfile = dwarf2_per_objfile->objfile;
11990 const gdb_byte *info_ptr, *end_ptr;
11992 dwarf2_read_section (objfile, §ion);
11993 info_ptr = section.buffer;
11995 if (info_ptr == NULL)
11998 if (dwarf_read_debug)
12000 fprintf_unfiltered (gdb_stdlog, "Reading %s for %s:\n",
12001 get_section_name (§ion),
12002 get_section_file_name (§ion));
12005 end_ptr = info_ptr + section.size;
12006 while (info_ptr < end_ptr)
12008 struct dwarf2_per_cu_data per_cu;
12009 struct create_dwo_cu_data create_dwo_cu_data;
12010 struct dwo_unit *dwo_unit;
12012 sect_offset sect_off = (sect_offset) (info_ptr - section.buffer);
12014 memset (&create_dwo_cu_data.dwo_unit, 0,
12015 sizeof (create_dwo_cu_data.dwo_unit));
12016 memset (&per_cu, 0, sizeof (per_cu));
12017 per_cu.dwarf2_per_objfile = dwarf2_per_objfile;
12018 per_cu.is_debug_types = 0;
12019 per_cu.sect_off = sect_offset (info_ptr - section.buffer);
12020 per_cu.section = §ion;
12021 create_dwo_cu_data.dwo_file = &dwo_file;
12023 init_cutu_and_read_dies_no_follow (
12024 &per_cu, &dwo_file, create_dwo_cu_reader, &create_dwo_cu_data);
12025 info_ptr += per_cu.length;
12027 // If the unit could not be parsed, skip it.
12028 if (create_dwo_cu_data.dwo_unit.dwo_file == NULL)
12031 if (cus_htab == NULL)
12032 cus_htab = allocate_dwo_unit_table (objfile);
12034 dwo_unit = OBSTACK_ZALLOC (&objfile->objfile_obstack, struct dwo_unit);
12035 *dwo_unit = create_dwo_cu_data.dwo_unit;
12036 slot = htab_find_slot (cus_htab, dwo_unit, INSERT);
12037 gdb_assert (slot != NULL);
12040 const struct dwo_unit *dup_cu = (const struct dwo_unit *)*slot;
12041 sect_offset dup_sect_off = dup_cu->sect_off;
12043 complaint (&symfile_complaints,
12044 _("debug cu entry at offset 0x%x is duplicate to"
12045 " the entry at offset 0x%x, signature %s"),
12046 to_underlying (sect_off), to_underlying (dup_sect_off),
12047 hex_string (dwo_unit->signature));
12049 *slot = (void *)dwo_unit;
12053 /* DWP file .debug_{cu,tu}_index section format:
12054 [ref: http://gcc.gnu.org/wiki/DebugFissionDWP]
12058 Both index sections have the same format, and serve to map a 64-bit
12059 signature to a set of section numbers. Each section begins with a header,
12060 followed by a hash table of 64-bit signatures, a parallel table of 32-bit
12061 indexes, and a pool of 32-bit section numbers. The index sections will be
12062 aligned at 8-byte boundaries in the file.
12064 The index section header consists of:
12066 V, 32 bit version number
12068 N, 32 bit number of compilation units or type units in the index
12069 M, 32 bit number of slots in the hash table
12071 Numbers are recorded using the byte order of the application binary.
12073 The hash table begins at offset 16 in the section, and consists of an array
12074 of M 64-bit slots. Each slot contains a 64-bit signature (using the byte
12075 order of the application binary). Unused slots in the hash table are 0.
12076 (We rely on the extreme unlikeliness of a signature being exactly 0.)
12078 The parallel table begins immediately after the hash table
12079 (at offset 16 + 8 * M from the beginning of the section), and consists of an
12080 array of 32-bit indexes (using the byte order of the application binary),
12081 corresponding 1-1 with slots in the hash table. Each entry in the parallel
12082 table contains a 32-bit index into the pool of section numbers. For unused
12083 hash table slots, the corresponding entry in the parallel table will be 0.
12085 The pool of section numbers begins immediately following the hash table
12086 (at offset 16 + 12 * M from the beginning of the section). The pool of
12087 section numbers consists of an array of 32-bit words (using the byte order
12088 of the application binary). Each item in the array is indexed starting
12089 from 0. The hash table entry provides the index of the first section
12090 number in the set. Additional section numbers in the set follow, and the
12091 set is terminated by a 0 entry (section number 0 is not used in ELF).
12093 In each set of section numbers, the .debug_info.dwo or .debug_types.dwo
12094 section must be the first entry in the set, and the .debug_abbrev.dwo must
12095 be the second entry. Other members of the set may follow in any order.
12101 DWP Version 2 combines all the .debug_info, etc. sections into one,
12102 and the entries in the index tables are now offsets into these sections.
12103 CU offsets begin at 0. TU offsets begin at the size of the .debug_info
12106 Index Section Contents:
12108 Hash Table of Signatures dwp_hash_table.hash_table
12109 Parallel Table of Indices dwp_hash_table.unit_table
12110 Table of Section Offsets dwp_hash_table.v2.{section_ids,offsets}
12111 Table of Section Sizes dwp_hash_table.v2.sizes
12113 The index section header consists of:
12115 V, 32 bit version number
12116 L, 32 bit number of columns in the table of section offsets
12117 N, 32 bit number of compilation units or type units in the index
12118 M, 32 bit number of slots in the hash table
12120 Numbers are recorded using the byte order of the application binary.
12122 The hash table has the same format as version 1.
12123 The parallel table of indices has the same format as version 1,
12124 except that the entries are origin-1 indices into the table of sections
12125 offsets and the table of section sizes.
12127 The table of offsets begins immediately following the parallel table
12128 (at offset 16 + 12 * M from the beginning of the section). The table is
12129 a two-dimensional array of 32-bit words (using the byte order of the
12130 application binary), with L columns and N+1 rows, in row-major order.
12131 Each row in the array is indexed starting from 0. The first row provides
12132 a key to the remaining rows: each column in this row provides an identifier
12133 for a debug section, and the offsets in the same column of subsequent rows
12134 refer to that section. The section identifiers are:
12136 DW_SECT_INFO 1 .debug_info.dwo
12137 DW_SECT_TYPES 2 .debug_types.dwo
12138 DW_SECT_ABBREV 3 .debug_abbrev.dwo
12139 DW_SECT_LINE 4 .debug_line.dwo
12140 DW_SECT_LOC 5 .debug_loc.dwo
12141 DW_SECT_STR_OFFSETS 6 .debug_str_offsets.dwo
12142 DW_SECT_MACINFO 7 .debug_macinfo.dwo
12143 DW_SECT_MACRO 8 .debug_macro.dwo
12145 The offsets provided by the CU and TU index sections are the base offsets
12146 for the contributions made by each CU or TU to the corresponding section
12147 in the package file. Each CU and TU header contains an abbrev_offset
12148 field, used to find the abbreviations table for that CU or TU within the
12149 contribution to the .debug_abbrev.dwo section for that CU or TU, and should
12150 be interpreted as relative to the base offset given in the index section.
12151 Likewise, offsets into .debug_line.dwo from DW_AT_stmt_list attributes
12152 should be interpreted as relative to the base offset for .debug_line.dwo,
12153 and offsets into other debug sections obtained from DWARF attributes should
12154 also be interpreted as relative to the corresponding base offset.
12156 The table of sizes begins immediately following the table of offsets.
12157 Like the table of offsets, it is a two-dimensional array of 32-bit words,
12158 with L columns and N rows, in row-major order. Each row in the array is
12159 indexed starting from 1 (row 0 is shared by the two tables).
12163 Hash table lookup is handled the same in version 1 and 2:
12165 We assume that N and M will not exceed 2^32 - 1.
12166 The size of the hash table, M, must be 2^k such that 2^k > 3*N/2.
12168 Given a 64-bit compilation unit signature or a type signature S, an entry
12169 in the hash table is located as follows:
12171 1) Calculate a primary hash H = S & MASK(k), where MASK(k) is a mask with
12172 the low-order k bits all set to 1.
12174 2) Calculate a secondary hash H' = (((S >> 32) & MASK(k)) | 1).
12176 3) If the hash table entry at index H matches the signature, use that
12177 entry. If the hash table entry at index H is unused (all zeroes),
12178 terminate the search: the signature is not present in the table.
12180 4) Let H = (H + H') modulo M. Repeat at Step 3.
12182 Because M > N and H' and M are relatively prime, the search is guaranteed
12183 to stop at an unused slot or find the match. */
12185 /* Create a hash table to map DWO IDs to their CU/TU entry in
12186 .debug_{info,types}.dwo in DWP_FILE.
12187 Returns NULL if there isn't one.
12188 Note: This function processes DWP files only, not DWO files. */
12190 static struct dwp_hash_table *
12191 create_dwp_hash_table (struct dwarf2_per_objfile *dwarf2_per_objfile,
12192 struct dwp_file *dwp_file, int is_debug_types)
12194 struct objfile *objfile = dwarf2_per_objfile->objfile;
12195 bfd *dbfd = dwp_file->dbfd;
12196 const gdb_byte *index_ptr, *index_end;
12197 struct dwarf2_section_info *index;
12198 uint32_t version, nr_columns, nr_units, nr_slots;
12199 struct dwp_hash_table *htab;
12201 if (is_debug_types)
12202 index = &dwp_file->sections.tu_index;
12204 index = &dwp_file->sections.cu_index;
12206 if (dwarf2_section_empty_p (index))
12208 dwarf2_read_section (objfile, index);
12210 index_ptr = index->buffer;
12211 index_end = index_ptr + index->size;
12213 version = read_4_bytes (dbfd, index_ptr);
12216 nr_columns = read_4_bytes (dbfd, index_ptr);
12220 nr_units = read_4_bytes (dbfd, index_ptr);
12222 nr_slots = read_4_bytes (dbfd, index_ptr);
12225 if (version != 1 && version != 2)
12227 error (_("Dwarf Error: unsupported DWP file version (%s)"
12228 " [in module %s]"),
12229 pulongest (version), dwp_file->name);
12231 if (nr_slots != (nr_slots & -nr_slots))
12233 error (_("Dwarf Error: number of slots in DWP hash table (%s)"
12234 " is not power of 2 [in module %s]"),
12235 pulongest (nr_slots), dwp_file->name);
12238 htab = OBSTACK_ZALLOC (&objfile->objfile_obstack, struct dwp_hash_table);
12239 htab->version = version;
12240 htab->nr_columns = nr_columns;
12241 htab->nr_units = nr_units;
12242 htab->nr_slots = nr_slots;
12243 htab->hash_table = index_ptr;
12244 htab->unit_table = htab->hash_table + sizeof (uint64_t) * nr_slots;
12246 /* Exit early if the table is empty. */
12247 if (nr_slots == 0 || nr_units == 0
12248 || (version == 2 && nr_columns == 0))
12250 /* All must be zero. */
12251 if (nr_slots != 0 || nr_units != 0
12252 || (version == 2 && nr_columns != 0))
12254 complaint (&symfile_complaints,
12255 _("Empty DWP but nr_slots,nr_units,nr_columns not"
12256 " all zero [in modules %s]"),
12264 htab->section_pool.v1.indices =
12265 htab->unit_table + sizeof (uint32_t) * nr_slots;
12266 /* It's harder to decide whether the section is too small in v1.
12267 V1 is deprecated anyway so we punt. */
12271 const gdb_byte *ids_ptr = htab->unit_table + sizeof (uint32_t) * nr_slots;
12272 int *ids = htab->section_pool.v2.section_ids;
12273 /* Reverse map for error checking. */
12274 int ids_seen[DW_SECT_MAX + 1];
12277 if (nr_columns < 2)
12279 error (_("Dwarf Error: bad DWP hash table, too few columns"
12280 " in section table [in module %s]"),
12283 if (nr_columns > MAX_NR_V2_DWO_SECTIONS)
12285 error (_("Dwarf Error: bad DWP hash table, too many columns"
12286 " in section table [in module %s]"),
12289 memset (ids, 255, (DW_SECT_MAX + 1) * sizeof (int32_t));
12290 memset (ids_seen, 255, (DW_SECT_MAX + 1) * sizeof (int32_t));
12291 for (i = 0; i < nr_columns; ++i)
12293 int id = read_4_bytes (dbfd, ids_ptr + i * sizeof (uint32_t));
12295 if (id < DW_SECT_MIN || id > DW_SECT_MAX)
12297 error (_("Dwarf Error: bad DWP hash table, bad section id %d"
12298 " in section table [in module %s]"),
12299 id, dwp_file->name);
12301 if (ids_seen[id] != -1)
12303 error (_("Dwarf Error: bad DWP hash table, duplicate section"
12304 " id %d in section table [in module %s]"),
12305 id, dwp_file->name);
12310 /* Must have exactly one info or types section. */
12311 if (((ids_seen[DW_SECT_INFO] != -1)
12312 + (ids_seen[DW_SECT_TYPES] != -1))
12315 error (_("Dwarf Error: bad DWP hash table, missing/duplicate"
12316 " DWO info/types section [in module %s]"),
12319 /* Must have an abbrev section. */
12320 if (ids_seen[DW_SECT_ABBREV] == -1)
12322 error (_("Dwarf Error: bad DWP hash table, missing DWO abbrev"
12323 " section [in module %s]"),
12326 htab->section_pool.v2.offsets = ids_ptr + sizeof (uint32_t) * nr_columns;
12327 htab->section_pool.v2.sizes =
12328 htab->section_pool.v2.offsets + (sizeof (uint32_t)
12329 * nr_units * nr_columns);
12330 if ((htab->section_pool.v2.sizes + (sizeof (uint32_t)
12331 * nr_units * nr_columns))
12334 error (_("Dwarf Error: DWP index section is corrupt (too small)"
12335 " [in module %s]"),
12343 /* Update SECTIONS with the data from SECTP.
12345 This function is like the other "locate" section routines that are
12346 passed to bfd_map_over_sections, but in this context the sections to
12347 read comes from the DWP V1 hash table, not the full ELF section table.
12349 The result is non-zero for success, or zero if an error was found. */
12352 locate_v1_virtual_dwo_sections (asection *sectp,
12353 struct virtual_v1_dwo_sections *sections)
12355 const struct dwop_section_names *names = &dwop_section_names;
12357 if (section_is_p (sectp->name, &names->abbrev_dwo))
12359 /* There can be only one. */
12360 if (sections->abbrev.s.section != NULL)
12362 sections->abbrev.s.section = sectp;
12363 sections->abbrev.size = bfd_get_section_size (sectp);
12365 else if (section_is_p (sectp->name, &names->info_dwo)
12366 || section_is_p (sectp->name, &names->types_dwo))
12368 /* There can be only one. */
12369 if (sections->info_or_types.s.section != NULL)
12371 sections->info_or_types.s.section = sectp;
12372 sections->info_or_types.size = bfd_get_section_size (sectp);
12374 else if (section_is_p (sectp->name, &names->line_dwo))
12376 /* There can be only one. */
12377 if (sections->line.s.section != NULL)
12379 sections->line.s.section = sectp;
12380 sections->line.size = bfd_get_section_size (sectp);
12382 else if (section_is_p (sectp->name, &names->loc_dwo))
12384 /* There can be only one. */
12385 if (sections->loc.s.section != NULL)
12387 sections->loc.s.section = sectp;
12388 sections->loc.size = bfd_get_section_size (sectp);
12390 else if (section_is_p (sectp->name, &names->macinfo_dwo))
12392 /* There can be only one. */
12393 if (sections->macinfo.s.section != NULL)
12395 sections->macinfo.s.section = sectp;
12396 sections->macinfo.size = bfd_get_section_size (sectp);
12398 else if (section_is_p (sectp->name, &names->macro_dwo))
12400 /* There can be only one. */
12401 if (sections->macro.s.section != NULL)
12403 sections->macro.s.section = sectp;
12404 sections->macro.size = bfd_get_section_size (sectp);
12406 else if (section_is_p (sectp->name, &names->str_offsets_dwo))
12408 /* There can be only one. */
12409 if (sections->str_offsets.s.section != NULL)
12411 sections->str_offsets.s.section = sectp;
12412 sections->str_offsets.size = bfd_get_section_size (sectp);
12416 /* No other kind of section is valid. */
12423 /* Create a dwo_unit object for the DWO unit with signature SIGNATURE.
12424 UNIT_INDEX is the index of the DWO unit in the DWP hash table.
12425 COMP_DIR is the DW_AT_comp_dir attribute of the referencing CU.
12426 This is for DWP version 1 files. */
12428 static struct dwo_unit *
12429 create_dwo_unit_in_dwp_v1 (struct dwarf2_per_objfile *dwarf2_per_objfile,
12430 struct dwp_file *dwp_file,
12431 uint32_t unit_index,
12432 const char *comp_dir,
12433 ULONGEST signature, int is_debug_types)
12435 struct objfile *objfile = dwarf2_per_objfile->objfile;
12436 const struct dwp_hash_table *dwp_htab =
12437 is_debug_types ? dwp_file->tus : dwp_file->cus;
12438 bfd *dbfd = dwp_file->dbfd;
12439 const char *kind = is_debug_types ? "TU" : "CU";
12440 struct dwo_file *dwo_file;
12441 struct dwo_unit *dwo_unit;
12442 struct virtual_v1_dwo_sections sections;
12443 void **dwo_file_slot;
12446 gdb_assert (dwp_file->version == 1);
12448 if (dwarf_read_debug)
12450 fprintf_unfiltered (gdb_stdlog, "Reading %s %s/%s in DWP V1 file: %s\n",
12452 pulongest (unit_index), hex_string (signature),
12456 /* Fetch the sections of this DWO unit.
12457 Put a limit on the number of sections we look for so that bad data
12458 doesn't cause us to loop forever. */
12460 #define MAX_NR_V1_DWO_SECTIONS \
12461 (1 /* .debug_info or .debug_types */ \
12462 + 1 /* .debug_abbrev */ \
12463 + 1 /* .debug_line */ \
12464 + 1 /* .debug_loc */ \
12465 + 1 /* .debug_str_offsets */ \
12466 + 1 /* .debug_macro or .debug_macinfo */ \
12467 + 1 /* trailing zero */)
12469 memset (§ions, 0, sizeof (sections));
12471 for (i = 0; i < MAX_NR_V1_DWO_SECTIONS; ++i)
12474 uint32_t section_nr =
12475 read_4_bytes (dbfd,
12476 dwp_htab->section_pool.v1.indices
12477 + (unit_index + i) * sizeof (uint32_t));
12479 if (section_nr == 0)
12481 if (section_nr >= dwp_file->num_sections)
12483 error (_("Dwarf Error: bad DWP hash table, section number too large"
12484 " [in module %s]"),
12488 sectp = dwp_file->elf_sections[section_nr];
12489 if (! locate_v1_virtual_dwo_sections (sectp, §ions))
12491 error (_("Dwarf Error: bad DWP hash table, invalid section found"
12492 " [in module %s]"),
12498 || dwarf2_section_empty_p (§ions.info_or_types)
12499 || dwarf2_section_empty_p (§ions.abbrev))
12501 error (_("Dwarf Error: bad DWP hash table, missing DWO sections"
12502 " [in module %s]"),
12505 if (i == MAX_NR_V1_DWO_SECTIONS)
12507 error (_("Dwarf Error: bad DWP hash table, too many DWO sections"
12508 " [in module %s]"),
12512 /* It's easier for the rest of the code if we fake a struct dwo_file and
12513 have dwo_unit "live" in that. At least for now.
12515 The DWP file can be made up of a random collection of CUs and TUs.
12516 However, for each CU + set of TUs that came from the same original DWO
12517 file, we can combine them back into a virtual DWO file to save space
12518 (fewer struct dwo_file objects to allocate). Remember that for really
12519 large apps there can be on the order of 8K CUs and 200K TUs, or more. */
12521 std::string virtual_dwo_name =
12522 string_printf ("virtual-dwo/%d-%d-%d-%d",
12523 get_section_id (§ions.abbrev),
12524 get_section_id (§ions.line),
12525 get_section_id (§ions.loc),
12526 get_section_id (§ions.str_offsets));
12527 /* Can we use an existing virtual DWO file? */
12528 dwo_file_slot = lookup_dwo_file_slot (dwarf2_per_objfile,
12529 virtual_dwo_name.c_str (),
12531 /* Create one if necessary. */
12532 if (*dwo_file_slot == NULL)
12534 if (dwarf_read_debug)
12536 fprintf_unfiltered (gdb_stdlog, "Creating virtual DWO: %s\n",
12537 virtual_dwo_name.c_str ());
12539 dwo_file = OBSTACK_ZALLOC (&objfile->objfile_obstack, struct dwo_file);
12541 = (const char *) obstack_copy0 (&objfile->objfile_obstack,
12542 virtual_dwo_name.c_str (),
12543 virtual_dwo_name.size ());
12544 dwo_file->comp_dir = comp_dir;
12545 dwo_file->sections.abbrev = sections.abbrev;
12546 dwo_file->sections.line = sections.line;
12547 dwo_file->sections.loc = sections.loc;
12548 dwo_file->sections.macinfo = sections.macinfo;
12549 dwo_file->sections.macro = sections.macro;
12550 dwo_file->sections.str_offsets = sections.str_offsets;
12551 /* The "str" section is global to the entire DWP file. */
12552 dwo_file->sections.str = dwp_file->sections.str;
12553 /* The info or types section is assigned below to dwo_unit,
12554 there's no need to record it in dwo_file.
12555 Also, we can't simply record type sections in dwo_file because
12556 we record a pointer into the vector in dwo_unit. As we collect more
12557 types we'll grow the vector and eventually have to reallocate space
12558 for it, invalidating all copies of pointers into the previous
12560 *dwo_file_slot = dwo_file;
12564 if (dwarf_read_debug)
12566 fprintf_unfiltered (gdb_stdlog, "Using existing virtual DWO: %s\n",
12567 virtual_dwo_name.c_str ());
12569 dwo_file = (struct dwo_file *) *dwo_file_slot;
12572 dwo_unit = OBSTACK_ZALLOC (&objfile->objfile_obstack, struct dwo_unit);
12573 dwo_unit->dwo_file = dwo_file;
12574 dwo_unit->signature = signature;
12575 dwo_unit->section =
12576 XOBNEW (&objfile->objfile_obstack, struct dwarf2_section_info);
12577 *dwo_unit->section = sections.info_or_types;
12578 /* dwo_unit->{offset,length,type_offset_in_tu} are set later. */
12583 /* Subroutine of create_dwo_unit_in_dwp_v2 to simplify it.
12584 Given a pointer to the containing section SECTION, and OFFSET,SIZE of the
12585 piece within that section used by a TU/CU, return a virtual section
12586 of just that piece. */
12588 static struct dwarf2_section_info
12589 create_dwp_v2_section (struct dwarf2_per_objfile *dwarf2_per_objfile,
12590 struct dwarf2_section_info *section,
12591 bfd_size_type offset, bfd_size_type size)
12593 struct dwarf2_section_info result;
12596 gdb_assert (section != NULL);
12597 gdb_assert (!section->is_virtual);
12599 memset (&result, 0, sizeof (result));
12600 result.s.containing_section = section;
12601 result.is_virtual = 1;
12606 sectp = get_section_bfd_section (section);
12608 /* Flag an error if the piece denoted by OFFSET,SIZE is outside the
12609 bounds of the real section. This is a pretty-rare event, so just
12610 flag an error (easier) instead of a warning and trying to cope. */
12612 || offset + size > bfd_get_section_size (sectp))
12614 error (_("Dwarf Error: Bad DWP V2 section info, doesn't fit"
12615 " in section %s [in module %s]"),
12616 sectp ? bfd_section_name (abfd, sectp) : "<unknown>",
12617 objfile_name (dwarf2_per_objfile->objfile));
12620 result.virtual_offset = offset;
12621 result.size = size;
12625 /* Create a dwo_unit object for the DWO unit with signature SIGNATURE.
12626 UNIT_INDEX is the index of the DWO unit in the DWP hash table.
12627 COMP_DIR is the DW_AT_comp_dir attribute of the referencing CU.
12628 This is for DWP version 2 files. */
12630 static struct dwo_unit *
12631 create_dwo_unit_in_dwp_v2 (struct dwarf2_per_objfile *dwarf2_per_objfile,
12632 struct dwp_file *dwp_file,
12633 uint32_t unit_index,
12634 const char *comp_dir,
12635 ULONGEST signature, int is_debug_types)
12637 struct objfile *objfile = dwarf2_per_objfile->objfile;
12638 const struct dwp_hash_table *dwp_htab =
12639 is_debug_types ? dwp_file->tus : dwp_file->cus;
12640 bfd *dbfd = dwp_file->dbfd;
12641 const char *kind = is_debug_types ? "TU" : "CU";
12642 struct dwo_file *dwo_file;
12643 struct dwo_unit *dwo_unit;
12644 struct virtual_v2_dwo_sections sections;
12645 void **dwo_file_slot;
12648 gdb_assert (dwp_file->version == 2);
12650 if (dwarf_read_debug)
12652 fprintf_unfiltered (gdb_stdlog, "Reading %s %s/%s in DWP V2 file: %s\n",
12654 pulongest (unit_index), hex_string (signature),
12658 /* Fetch the section offsets of this DWO unit. */
12660 memset (§ions, 0, sizeof (sections));
12662 for (i = 0; i < dwp_htab->nr_columns; ++i)
12664 uint32_t offset = read_4_bytes (dbfd,
12665 dwp_htab->section_pool.v2.offsets
12666 + (((unit_index - 1) * dwp_htab->nr_columns
12668 * sizeof (uint32_t)));
12669 uint32_t size = read_4_bytes (dbfd,
12670 dwp_htab->section_pool.v2.sizes
12671 + (((unit_index - 1) * dwp_htab->nr_columns
12673 * sizeof (uint32_t)));
12675 switch (dwp_htab->section_pool.v2.section_ids[i])
12678 case DW_SECT_TYPES:
12679 sections.info_or_types_offset = offset;
12680 sections.info_or_types_size = size;
12682 case DW_SECT_ABBREV:
12683 sections.abbrev_offset = offset;
12684 sections.abbrev_size = size;
12687 sections.line_offset = offset;
12688 sections.line_size = size;
12691 sections.loc_offset = offset;
12692 sections.loc_size = size;
12694 case DW_SECT_STR_OFFSETS:
12695 sections.str_offsets_offset = offset;
12696 sections.str_offsets_size = size;
12698 case DW_SECT_MACINFO:
12699 sections.macinfo_offset = offset;
12700 sections.macinfo_size = size;
12702 case DW_SECT_MACRO:
12703 sections.macro_offset = offset;
12704 sections.macro_size = size;
12709 /* It's easier for the rest of the code if we fake a struct dwo_file and
12710 have dwo_unit "live" in that. At least for now.
12712 The DWP file can be made up of a random collection of CUs and TUs.
12713 However, for each CU + set of TUs that came from the same original DWO
12714 file, we can combine them back into a virtual DWO file to save space
12715 (fewer struct dwo_file objects to allocate). Remember that for really
12716 large apps there can be on the order of 8K CUs and 200K TUs, or more. */
12718 std::string virtual_dwo_name =
12719 string_printf ("virtual-dwo/%ld-%ld-%ld-%ld",
12720 (long) (sections.abbrev_size ? sections.abbrev_offset : 0),
12721 (long) (sections.line_size ? sections.line_offset : 0),
12722 (long) (sections.loc_size ? sections.loc_offset : 0),
12723 (long) (sections.str_offsets_size
12724 ? sections.str_offsets_offset : 0));
12725 /* Can we use an existing virtual DWO file? */
12726 dwo_file_slot = lookup_dwo_file_slot (dwarf2_per_objfile,
12727 virtual_dwo_name.c_str (),
12729 /* Create one if necessary. */
12730 if (*dwo_file_slot == NULL)
12732 if (dwarf_read_debug)
12734 fprintf_unfiltered (gdb_stdlog, "Creating virtual DWO: %s\n",
12735 virtual_dwo_name.c_str ());
12737 dwo_file = OBSTACK_ZALLOC (&objfile->objfile_obstack, struct dwo_file);
12739 = (const char *) obstack_copy0 (&objfile->objfile_obstack,
12740 virtual_dwo_name.c_str (),
12741 virtual_dwo_name.size ());
12742 dwo_file->comp_dir = comp_dir;
12743 dwo_file->sections.abbrev =
12744 create_dwp_v2_section (dwarf2_per_objfile, &dwp_file->sections.abbrev,
12745 sections.abbrev_offset, sections.abbrev_size);
12746 dwo_file->sections.line =
12747 create_dwp_v2_section (dwarf2_per_objfile, &dwp_file->sections.line,
12748 sections.line_offset, sections.line_size);
12749 dwo_file->sections.loc =
12750 create_dwp_v2_section (dwarf2_per_objfile, &dwp_file->sections.loc,
12751 sections.loc_offset, sections.loc_size);
12752 dwo_file->sections.macinfo =
12753 create_dwp_v2_section (dwarf2_per_objfile, &dwp_file->sections.macinfo,
12754 sections.macinfo_offset, sections.macinfo_size);
12755 dwo_file->sections.macro =
12756 create_dwp_v2_section (dwarf2_per_objfile, &dwp_file->sections.macro,
12757 sections.macro_offset, sections.macro_size);
12758 dwo_file->sections.str_offsets =
12759 create_dwp_v2_section (dwarf2_per_objfile,
12760 &dwp_file->sections.str_offsets,
12761 sections.str_offsets_offset,
12762 sections.str_offsets_size);
12763 /* The "str" section is global to the entire DWP file. */
12764 dwo_file->sections.str = dwp_file->sections.str;
12765 /* The info or types section is assigned below to dwo_unit,
12766 there's no need to record it in dwo_file.
12767 Also, we can't simply record type sections in dwo_file because
12768 we record a pointer into the vector in dwo_unit. As we collect more
12769 types we'll grow the vector and eventually have to reallocate space
12770 for it, invalidating all copies of pointers into the previous
12772 *dwo_file_slot = dwo_file;
12776 if (dwarf_read_debug)
12778 fprintf_unfiltered (gdb_stdlog, "Using existing virtual DWO: %s\n",
12779 virtual_dwo_name.c_str ());
12781 dwo_file = (struct dwo_file *) *dwo_file_slot;
12784 dwo_unit = OBSTACK_ZALLOC (&objfile->objfile_obstack, struct dwo_unit);
12785 dwo_unit->dwo_file = dwo_file;
12786 dwo_unit->signature = signature;
12787 dwo_unit->section =
12788 XOBNEW (&objfile->objfile_obstack, struct dwarf2_section_info);
12789 *dwo_unit->section = create_dwp_v2_section (dwarf2_per_objfile,
12791 ? &dwp_file->sections.types
12792 : &dwp_file->sections.info,
12793 sections.info_or_types_offset,
12794 sections.info_or_types_size);
12795 /* dwo_unit->{offset,length,type_offset_in_tu} are set later. */
12800 /* Lookup the DWO unit with SIGNATURE in DWP_FILE.
12801 Returns NULL if the signature isn't found. */
12803 static struct dwo_unit *
12804 lookup_dwo_unit_in_dwp (struct dwarf2_per_objfile *dwarf2_per_objfile,
12805 struct dwp_file *dwp_file, const char *comp_dir,
12806 ULONGEST signature, int is_debug_types)
12808 const struct dwp_hash_table *dwp_htab =
12809 is_debug_types ? dwp_file->tus : dwp_file->cus;
12810 bfd *dbfd = dwp_file->dbfd;
12811 uint32_t mask = dwp_htab->nr_slots - 1;
12812 uint32_t hash = signature & mask;
12813 uint32_t hash2 = ((signature >> 32) & mask) | 1;
12816 struct dwo_unit find_dwo_cu;
12818 memset (&find_dwo_cu, 0, sizeof (find_dwo_cu));
12819 find_dwo_cu.signature = signature;
12820 slot = htab_find_slot (is_debug_types
12821 ? dwp_file->loaded_tus
12822 : dwp_file->loaded_cus,
12823 &find_dwo_cu, INSERT);
12826 return (struct dwo_unit *) *slot;
12828 /* Use a for loop so that we don't loop forever on bad debug info. */
12829 for (i = 0; i < dwp_htab->nr_slots; ++i)
12831 ULONGEST signature_in_table;
12833 signature_in_table =
12834 read_8_bytes (dbfd, dwp_htab->hash_table + hash * sizeof (uint64_t));
12835 if (signature_in_table == signature)
12837 uint32_t unit_index =
12838 read_4_bytes (dbfd,
12839 dwp_htab->unit_table + hash * sizeof (uint32_t));
12841 if (dwp_file->version == 1)
12843 *slot = create_dwo_unit_in_dwp_v1 (dwarf2_per_objfile,
12844 dwp_file, unit_index,
12845 comp_dir, signature,
12850 *slot = create_dwo_unit_in_dwp_v2 (dwarf2_per_objfile,
12851 dwp_file, unit_index,
12852 comp_dir, signature,
12855 return (struct dwo_unit *) *slot;
12857 if (signature_in_table == 0)
12859 hash = (hash + hash2) & mask;
12862 error (_("Dwarf Error: bad DWP hash table, lookup didn't terminate"
12863 " [in module %s]"),
12867 /* Subroutine of open_dwo_file,open_dwp_file to simplify them.
12868 Open the file specified by FILE_NAME and hand it off to BFD for
12869 preliminary analysis. Return a newly initialized bfd *, which
12870 includes a canonicalized copy of FILE_NAME.
12871 If IS_DWP is TRUE, we're opening a DWP file, otherwise a DWO file.
12872 SEARCH_CWD is true if the current directory is to be searched.
12873 It will be searched before debug-file-directory.
12874 If successful, the file is added to the bfd include table of the
12875 objfile's bfd (see gdb_bfd_record_inclusion).
12876 If unable to find/open the file, return NULL.
12877 NOTE: This function is derived from symfile_bfd_open. */
12879 static gdb_bfd_ref_ptr
12880 try_open_dwop_file (struct dwarf2_per_objfile *dwarf2_per_objfile,
12881 const char *file_name, int is_dwp, int search_cwd)
12884 /* Blech. OPF_TRY_CWD_FIRST also disables searching the path list if
12885 FILE_NAME contains a '/'. So we can't use it. Instead prepend "."
12886 to debug_file_directory. */
12887 const char *search_path;
12888 static const char dirname_separator_string[] = { DIRNAME_SEPARATOR, '\0' };
12890 gdb::unique_xmalloc_ptr<char> search_path_holder;
12893 if (*debug_file_directory != '\0')
12895 search_path_holder.reset (concat (".", dirname_separator_string,
12896 debug_file_directory,
12898 search_path = search_path_holder.get ();
12904 search_path = debug_file_directory;
12906 openp_flags flags = OPF_RETURN_REALPATH;
12908 flags |= OPF_SEARCH_IN_PATH;
12910 gdb::unique_xmalloc_ptr<char> absolute_name;
12911 desc = openp (search_path, flags, file_name,
12912 O_RDONLY | O_BINARY, &absolute_name);
12916 gdb_bfd_ref_ptr sym_bfd (gdb_bfd_open (absolute_name.get (),
12918 if (sym_bfd == NULL)
12920 bfd_set_cacheable (sym_bfd.get (), 1);
12922 if (!bfd_check_format (sym_bfd.get (), bfd_object))
12925 /* Success. Record the bfd as having been included by the objfile's bfd.
12926 This is important because things like demangled_names_hash lives in the
12927 objfile's per_bfd space and may have references to things like symbol
12928 names that live in the DWO/DWP file's per_bfd space. PR 16426. */
12929 gdb_bfd_record_inclusion (dwarf2_per_objfile->objfile->obfd, sym_bfd.get ());
12934 /* Try to open DWO file FILE_NAME.
12935 COMP_DIR is the DW_AT_comp_dir attribute.
12936 The result is the bfd handle of the file.
12937 If there is a problem finding or opening the file, return NULL.
12938 Upon success, the canonicalized path of the file is stored in the bfd,
12939 same as symfile_bfd_open. */
12941 static gdb_bfd_ref_ptr
12942 open_dwo_file (struct dwarf2_per_objfile *dwarf2_per_objfile,
12943 const char *file_name, const char *comp_dir)
12945 if (IS_ABSOLUTE_PATH (file_name))
12946 return try_open_dwop_file (dwarf2_per_objfile, file_name,
12947 0 /*is_dwp*/, 0 /*search_cwd*/);
12949 /* Before trying the search path, try DWO_NAME in COMP_DIR. */
12951 if (comp_dir != NULL)
12953 char *path_to_try = concat (comp_dir, SLASH_STRING,
12954 file_name, (char *) NULL);
12956 /* NOTE: If comp_dir is a relative path, this will also try the
12957 search path, which seems useful. */
12958 gdb_bfd_ref_ptr abfd (try_open_dwop_file (dwarf2_per_objfile,
12961 1 /*search_cwd*/));
12962 xfree (path_to_try);
12967 /* That didn't work, try debug-file-directory, which, despite its name,
12968 is a list of paths. */
12970 if (*debug_file_directory == '\0')
12973 return try_open_dwop_file (dwarf2_per_objfile, file_name,
12974 0 /*is_dwp*/, 1 /*search_cwd*/);
12977 /* This function is mapped across the sections and remembers the offset and
12978 size of each of the DWO debugging sections we are interested in. */
12981 dwarf2_locate_dwo_sections (bfd *abfd, asection *sectp, void *dwo_sections_ptr)
12983 struct dwo_sections *dwo_sections = (struct dwo_sections *) dwo_sections_ptr;
12984 const struct dwop_section_names *names = &dwop_section_names;
12986 if (section_is_p (sectp->name, &names->abbrev_dwo))
12988 dwo_sections->abbrev.s.section = sectp;
12989 dwo_sections->abbrev.size = bfd_get_section_size (sectp);
12991 else if (section_is_p (sectp->name, &names->info_dwo))
12993 dwo_sections->info.s.section = sectp;
12994 dwo_sections->info.size = bfd_get_section_size (sectp);
12996 else if (section_is_p (sectp->name, &names->line_dwo))
12998 dwo_sections->line.s.section = sectp;
12999 dwo_sections->line.size = bfd_get_section_size (sectp);
13001 else if (section_is_p (sectp->name, &names->loc_dwo))
13003 dwo_sections->loc.s.section = sectp;
13004 dwo_sections->loc.size = bfd_get_section_size (sectp);
13006 else if (section_is_p (sectp->name, &names->macinfo_dwo))
13008 dwo_sections->macinfo.s.section = sectp;
13009 dwo_sections->macinfo.size = bfd_get_section_size (sectp);
13011 else if (section_is_p (sectp->name, &names->macro_dwo))
13013 dwo_sections->macro.s.section = sectp;
13014 dwo_sections->macro.size = bfd_get_section_size (sectp);
13016 else if (section_is_p (sectp->name, &names->str_dwo))
13018 dwo_sections->str.s.section = sectp;
13019 dwo_sections->str.size = bfd_get_section_size (sectp);
13021 else if (section_is_p (sectp->name, &names->str_offsets_dwo))
13023 dwo_sections->str_offsets.s.section = sectp;
13024 dwo_sections->str_offsets.size = bfd_get_section_size (sectp);
13026 else if (section_is_p (sectp->name, &names->types_dwo))
13028 struct dwarf2_section_info type_section;
13030 memset (&type_section, 0, sizeof (type_section));
13031 type_section.s.section = sectp;
13032 type_section.size = bfd_get_section_size (sectp);
13033 VEC_safe_push (dwarf2_section_info_def, dwo_sections->types,
13038 /* Initialize the use of the DWO file specified by DWO_NAME and referenced
13039 by PER_CU. This is for the non-DWP case.
13040 The result is NULL if DWO_NAME can't be found. */
13042 static struct dwo_file *
13043 open_and_init_dwo_file (struct dwarf2_per_cu_data *per_cu,
13044 const char *dwo_name, const char *comp_dir)
13046 struct dwarf2_per_objfile *dwarf2_per_objfile = per_cu->dwarf2_per_objfile;
13047 struct objfile *objfile = dwarf2_per_objfile->objfile;
13048 struct dwo_file *dwo_file;
13049 struct cleanup *cleanups;
13051 gdb_bfd_ref_ptr dbfd (open_dwo_file (dwarf2_per_objfile, dwo_name, comp_dir));
13054 if (dwarf_read_debug)
13055 fprintf_unfiltered (gdb_stdlog, "DWO file not found: %s\n", dwo_name);
13058 dwo_file = OBSTACK_ZALLOC (&objfile->objfile_obstack, struct dwo_file);
13059 dwo_file->dwo_name = dwo_name;
13060 dwo_file->comp_dir = comp_dir;
13061 dwo_file->dbfd = dbfd.release ();
13063 free_dwo_file_cleanup_data *cleanup_data = XNEW (free_dwo_file_cleanup_data);
13064 cleanup_data->dwo_file = dwo_file;
13065 cleanup_data->dwarf2_per_objfile = dwarf2_per_objfile;
13067 cleanups = make_cleanup (free_dwo_file_cleanup, cleanup_data);
13069 bfd_map_over_sections (dwo_file->dbfd, dwarf2_locate_dwo_sections,
13070 &dwo_file->sections);
13072 create_cus_hash_table (dwarf2_per_objfile, *dwo_file, dwo_file->sections.info,
13075 create_debug_types_hash_table (dwarf2_per_objfile, dwo_file,
13076 dwo_file->sections.types, dwo_file->tus);
13078 discard_cleanups (cleanups);
13080 if (dwarf_read_debug)
13081 fprintf_unfiltered (gdb_stdlog, "DWO file found: %s\n", dwo_name);
13086 /* This function is mapped across the sections and remembers the offset and
13087 size of each of the DWP debugging sections common to version 1 and 2 that
13088 we are interested in. */
13091 dwarf2_locate_common_dwp_sections (bfd *abfd, asection *sectp,
13092 void *dwp_file_ptr)
13094 struct dwp_file *dwp_file = (struct dwp_file *) dwp_file_ptr;
13095 const struct dwop_section_names *names = &dwop_section_names;
13096 unsigned int elf_section_nr = elf_section_data (sectp)->this_idx;
13098 /* Record the ELF section number for later lookup: this is what the
13099 .debug_cu_index,.debug_tu_index tables use in DWP V1. */
13100 gdb_assert (elf_section_nr < dwp_file->num_sections);
13101 dwp_file->elf_sections[elf_section_nr] = sectp;
13103 /* Look for specific sections that we need. */
13104 if (section_is_p (sectp->name, &names->str_dwo))
13106 dwp_file->sections.str.s.section = sectp;
13107 dwp_file->sections.str.size = bfd_get_section_size (sectp);
13109 else if (section_is_p (sectp->name, &names->cu_index))
13111 dwp_file->sections.cu_index.s.section = sectp;
13112 dwp_file->sections.cu_index.size = bfd_get_section_size (sectp);
13114 else if (section_is_p (sectp->name, &names->tu_index))
13116 dwp_file->sections.tu_index.s.section = sectp;
13117 dwp_file->sections.tu_index.size = bfd_get_section_size (sectp);
13121 /* This function is mapped across the sections and remembers the offset and
13122 size of each of the DWP version 2 debugging sections that we are interested
13123 in. This is split into a separate function because we don't know if we
13124 have version 1 or 2 until we parse the cu_index/tu_index sections. */
13127 dwarf2_locate_v2_dwp_sections (bfd *abfd, asection *sectp, void *dwp_file_ptr)
13129 struct dwp_file *dwp_file = (struct dwp_file *) dwp_file_ptr;
13130 const struct dwop_section_names *names = &dwop_section_names;
13131 unsigned int elf_section_nr = elf_section_data (sectp)->this_idx;
13133 /* Record the ELF section number for later lookup: this is what the
13134 .debug_cu_index,.debug_tu_index tables use in DWP V1. */
13135 gdb_assert (elf_section_nr < dwp_file->num_sections);
13136 dwp_file->elf_sections[elf_section_nr] = sectp;
13138 /* Look for specific sections that we need. */
13139 if (section_is_p (sectp->name, &names->abbrev_dwo))
13141 dwp_file->sections.abbrev.s.section = sectp;
13142 dwp_file->sections.abbrev.size = bfd_get_section_size (sectp);
13144 else if (section_is_p (sectp->name, &names->info_dwo))
13146 dwp_file->sections.info.s.section = sectp;
13147 dwp_file->sections.info.size = bfd_get_section_size (sectp);
13149 else if (section_is_p (sectp->name, &names->line_dwo))
13151 dwp_file->sections.line.s.section = sectp;
13152 dwp_file->sections.line.size = bfd_get_section_size (sectp);
13154 else if (section_is_p (sectp->name, &names->loc_dwo))
13156 dwp_file->sections.loc.s.section = sectp;
13157 dwp_file->sections.loc.size = bfd_get_section_size (sectp);
13159 else if (section_is_p (sectp->name, &names->macinfo_dwo))
13161 dwp_file->sections.macinfo.s.section = sectp;
13162 dwp_file->sections.macinfo.size = bfd_get_section_size (sectp);
13164 else if (section_is_p (sectp->name, &names->macro_dwo))
13166 dwp_file->sections.macro.s.section = sectp;
13167 dwp_file->sections.macro.size = bfd_get_section_size (sectp);
13169 else if (section_is_p (sectp->name, &names->str_offsets_dwo))
13171 dwp_file->sections.str_offsets.s.section = sectp;
13172 dwp_file->sections.str_offsets.size = bfd_get_section_size (sectp);
13174 else if (section_is_p (sectp->name, &names->types_dwo))
13176 dwp_file->sections.types.s.section = sectp;
13177 dwp_file->sections.types.size = bfd_get_section_size (sectp);
13181 /* Hash function for dwp_file loaded CUs/TUs. */
13184 hash_dwp_loaded_cutus (const void *item)
13186 const struct dwo_unit *dwo_unit = (const struct dwo_unit *) item;
13188 /* This drops the top 32 bits of the signature, but is ok for a hash. */
13189 return dwo_unit->signature;
13192 /* Equality function for dwp_file loaded CUs/TUs. */
13195 eq_dwp_loaded_cutus (const void *a, const void *b)
13197 const struct dwo_unit *dua = (const struct dwo_unit *) a;
13198 const struct dwo_unit *dub = (const struct dwo_unit *) b;
13200 return dua->signature == dub->signature;
13203 /* Allocate a hash table for dwp_file loaded CUs/TUs. */
13206 allocate_dwp_loaded_cutus_table (struct objfile *objfile)
13208 return htab_create_alloc_ex (3,
13209 hash_dwp_loaded_cutus,
13210 eq_dwp_loaded_cutus,
13212 &objfile->objfile_obstack,
13213 hashtab_obstack_allocate,
13214 dummy_obstack_deallocate);
13217 /* Try to open DWP file FILE_NAME.
13218 The result is the bfd handle of the file.
13219 If there is a problem finding or opening the file, return NULL.
13220 Upon success, the canonicalized path of the file is stored in the bfd,
13221 same as symfile_bfd_open. */
13223 static gdb_bfd_ref_ptr
13224 open_dwp_file (struct dwarf2_per_objfile *dwarf2_per_objfile,
13225 const char *file_name)
13227 gdb_bfd_ref_ptr abfd (try_open_dwop_file (dwarf2_per_objfile, file_name,
13229 1 /*search_cwd*/));
13233 /* Work around upstream bug 15652.
13234 http://sourceware.org/bugzilla/show_bug.cgi?id=15652
13235 [Whether that's a "bug" is debatable, but it is getting in our way.]
13236 We have no real idea where the dwp file is, because gdb's realpath-ing
13237 of the executable's path may have discarded the needed info.
13238 [IWBN if the dwp file name was recorded in the executable, akin to
13239 .gnu_debuglink, but that doesn't exist yet.]
13240 Strip the directory from FILE_NAME and search again. */
13241 if (*debug_file_directory != '\0')
13243 /* Don't implicitly search the current directory here.
13244 If the user wants to search "." to handle this case,
13245 it must be added to debug-file-directory. */
13246 return try_open_dwop_file (dwarf2_per_objfile,
13247 lbasename (file_name), 1 /*is_dwp*/,
13254 /* Initialize the use of the DWP file for the current objfile.
13255 By convention the name of the DWP file is ${objfile}.dwp.
13256 The result is NULL if it can't be found. */
13258 static struct dwp_file *
13259 open_and_init_dwp_file (struct dwarf2_per_objfile *dwarf2_per_objfile)
13261 struct objfile *objfile = dwarf2_per_objfile->objfile;
13262 struct dwp_file *dwp_file;
13264 /* Try to find first .dwp for the binary file before any symbolic links
13267 /* If the objfile is a debug file, find the name of the real binary
13268 file and get the name of dwp file from there. */
13269 std::string dwp_name;
13270 if (objfile->separate_debug_objfile_backlink != NULL)
13272 struct objfile *backlink = objfile->separate_debug_objfile_backlink;
13273 const char *backlink_basename = lbasename (backlink->original_name);
13275 dwp_name = ldirname (objfile->original_name) + SLASH_STRING + backlink_basename;
13278 dwp_name = objfile->original_name;
13280 dwp_name += ".dwp";
13282 gdb_bfd_ref_ptr dbfd (open_dwp_file (dwarf2_per_objfile, dwp_name.c_str ()));
13284 && strcmp (objfile->original_name, objfile_name (objfile)) != 0)
13286 /* Try to find .dwp for the binary file after gdb_realpath resolving. */
13287 dwp_name = objfile_name (objfile);
13288 dwp_name += ".dwp";
13289 dbfd = open_dwp_file (dwarf2_per_objfile, dwp_name.c_str ());
13294 if (dwarf_read_debug)
13295 fprintf_unfiltered (gdb_stdlog, "DWP file not found: %s\n", dwp_name.c_str ());
13298 dwp_file = OBSTACK_ZALLOC (&objfile->objfile_obstack, struct dwp_file);
13299 dwp_file->name = bfd_get_filename (dbfd.get ());
13300 dwp_file->dbfd = dbfd.release ();
13302 /* +1: section 0 is unused */
13303 dwp_file->num_sections = bfd_count_sections (dwp_file->dbfd) + 1;
13304 dwp_file->elf_sections =
13305 OBSTACK_CALLOC (&objfile->objfile_obstack,
13306 dwp_file->num_sections, asection *);
13308 bfd_map_over_sections (dwp_file->dbfd, dwarf2_locate_common_dwp_sections,
13311 dwp_file->cus = create_dwp_hash_table (dwarf2_per_objfile, dwp_file, 0);
13313 dwp_file->tus = create_dwp_hash_table (dwarf2_per_objfile, dwp_file, 1);
13315 /* The DWP file version is stored in the hash table. Oh well. */
13316 if (dwp_file->cus && dwp_file->tus
13317 && dwp_file->cus->version != dwp_file->tus->version)
13319 /* Technically speaking, we should try to limp along, but this is
13320 pretty bizarre. We use pulongest here because that's the established
13321 portability solution (e.g, we cannot use %u for uint32_t). */
13322 error (_("Dwarf Error: DWP file CU version %s doesn't match"
13323 " TU version %s [in DWP file %s]"),
13324 pulongest (dwp_file->cus->version),
13325 pulongest (dwp_file->tus->version), dwp_name.c_str ());
13329 dwp_file->version = dwp_file->cus->version;
13330 else if (dwp_file->tus)
13331 dwp_file->version = dwp_file->tus->version;
13333 dwp_file->version = 2;
13335 if (dwp_file->version == 2)
13336 bfd_map_over_sections (dwp_file->dbfd, dwarf2_locate_v2_dwp_sections,
13339 dwp_file->loaded_cus = allocate_dwp_loaded_cutus_table (objfile);
13340 dwp_file->loaded_tus = allocate_dwp_loaded_cutus_table (objfile);
13342 if (dwarf_read_debug)
13344 fprintf_unfiltered (gdb_stdlog, "DWP file found: %s\n", dwp_file->name);
13345 fprintf_unfiltered (gdb_stdlog,
13346 " %s CUs, %s TUs\n",
13347 pulongest (dwp_file->cus ? dwp_file->cus->nr_units : 0),
13348 pulongest (dwp_file->tus ? dwp_file->tus->nr_units : 0));
13354 /* Wrapper around open_and_init_dwp_file, only open it once. */
13356 static struct dwp_file *
13357 get_dwp_file (struct dwarf2_per_objfile *dwarf2_per_objfile)
13359 if (! dwarf2_per_objfile->dwp_checked)
13361 dwarf2_per_objfile->dwp_file
13362 = open_and_init_dwp_file (dwarf2_per_objfile);
13363 dwarf2_per_objfile->dwp_checked = 1;
13365 return dwarf2_per_objfile->dwp_file;
13368 /* Subroutine of lookup_dwo_comp_unit, lookup_dwo_type_unit.
13369 Look up the CU/TU with signature SIGNATURE, either in DWO file DWO_NAME
13370 or in the DWP file for the objfile, referenced by THIS_UNIT.
13371 If non-NULL, comp_dir is the DW_AT_comp_dir attribute.
13372 IS_DEBUG_TYPES is non-zero if reading a TU, otherwise read a CU.
13374 This is called, for example, when wanting to read a variable with a
13375 complex location. Therefore we don't want to do file i/o for every call.
13376 Therefore we don't want to look for a DWO file on every call.
13377 Therefore we first see if we've already seen SIGNATURE in a DWP file,
13378 then we check if we've already seen DWO_NAME, and only THEN do we check
13381 The result is a pointer to the dwo_unit object or NULL if we didn't find it
13382 (dwo_id mismatch or couldn't find the DWO/DWP file). */
13384 static struct dwo_unit *
13385 lookup_dwo_cutu (struct dwarf2_per_cu_data *this_unit,
13386 const char *dwo_name, const char *comp_dir,
13387 ULONGEST signature, int is_debug_types)
13389 struct dwarf2_per_objfile *dwarf2_per_objfile = this_unit->dwarf2_per_objfile;
13390 struct objfile *objfile = dwarf2_per_objfile->objfile;
13391 const char *kind = is_debug_types ? "TU" : "CU";
13392 void **dwo_file_slot;
13393 struct dwo_file *dwo_file;
13394 struct dwp_file *dwp_file;
13396 /* First see if there's a DWP file.
13397 If we have a DWP file but didn't find the DWO inside it, don't
13398 look for the original DWO file. It makes gdb behave differently
13399 depending on whether one is debugging in the build tree. */
13401 dwp_file = get_dwp_file (dwarf2_per_objfile);
13402 if (dwp_file != NULL)
13404 const struct dwp_hash_table *dwp_htab =
13405 is_debug_types ? dwp_file->tus : dwp_file->cus;
13407 if (dwp_htab != NULL)
13409 struct dwo_unit *dwo_cutu =
13410 lookup_dwo_unit_in_dwp (dwarf2_per_objfile, dwp_file, comp_dir,
13411 signature, is_debug_types);
13413 if (dwo_cutu != NULL)
13415 if (dwarf_read_debug)
13417 fprintf_unfiltered (gdb_stdlog,
13418 "Virtual DWO %s %s found: @%s\n",
13419 kind, hex_string (signature),
13420 host_address_to_string (dwo_cutu));
13428 /* No DWP file, look for the DWO file. */
13430 dwo_file_slot = lookup_dwo_file_slot (dwarf2_per_objfile,
13431 dwo_name, comp_dir);
13432 if (*dwo_file_slot == NULL)
13434 /* Read in the file and build a table of the CUs/TUs it contains. */
13435 *dwo_file_slot = open_and_init_dwo_file (this_unit, dwo_name, comp_dir);
13437 /* NOTE: This will be NULL if unable to open the file. */
13438 dwo_file = (struct dwo_file *) *dwo_file_slot;
13440 if (dwo_file != NULL)
13442 struct dwo_unit *dwo_cutu = NULL;
13444 if (is_debug_types && dwo_file->tus)
13446 struct dwo_unit find_dwo_cutu;
13448 memset (&find_dwo_cutu, 0, sizeof (find_dwo_cutu));
13449 find_dwo_cutu.signature = signature;
13451 = (struct dwo_unit *) htab_find (dwo_file->tus, &find_dwo_cutu);
13453 else if (!is_debug_types && dwo_file->cus)
13455 struct dwo_unit find_dwo_cutu;
13457 memset (&find_dwo_cutu, 0, sizeof (find_dwo_cutu));
13458 find_dwo_cutu.signature = signature;
13459 dwo_cutu = (struct dwo_unit *)htab_find (dwo_file->cus,
13463 if (dwo_cutu != NULL)
13465 if (dwarf_read_debug)
13467 fprintf_unfiltered (gdb_stdlog, "DWO %s %s(%s) found: @%s\n",
13468 kind, dwo_name, hex_string (signature),
13469 host_address_to_string (dwo_cutu));
13476 /* We didn't find it. This could mean a dwo_id mismatch, or
13477 someone deleted the DWO/DWP file, or the search path isn't set up
13478 correctly to find the file. */
13480 if (dwarf_read_debug)
13482 fprintf_unfiltered (gdb_stdlog, "DWO %s %s(%s) not found\n",
13483 kind, dwo_name, hex_string (signature));
13486 /* This is a warning and not a complaint because it can be caused by
13487 pilot error (e.g., user accidentally deleting the DWO). */
13489 /* Print the name of the DWP file if we looked there, helps the user
13490 better diagnose the problem. */
13491 std::string dwp_text;
13493 if (dwp_file != NULL)
13494 dwp_text = string_printf (" [in DWP file %s]",
13495 lbasename (dwp_file->name));
13497 warning (_("Could not find DWO %s %s(%s)%s referenced by %s at offset 0x%x"
13498 " [in module %s]"),
13499 kind, dwo_name, hex_string (signature),
13501 this_unit->is_debug_types ? "TU" : "CU",
13502 to_underlying (this_unit->sect_off), objfile_name (objfile));
13507 /* Lookup the DWO CU DWO_NAME/SIGNATURE referenced from THIS_CU.
13508 See lookup_dwo_cutu_unit for details. */
13510 static struct dwo_unit *
13511 lookup_dwo_comp_unit (struct dwarf2_per_cu_data *this_cu,
13512 const char *dwo_name, const char *comp_dir,
13513 ULONGEST signature)
13515 return lookup_dwo_cutu (this_cu, dwo_name, comp_dir, signature, 0);
13518 /* Lookup the DWO TU DWO_NAME/SIGNATURE referenced from THIS_TU.
13519 See lookup_dwo_cutu_unit for details. */
13521 static struct dwo_unit *
13522 lookup_dwo_type_unit (struct signatured_type *this_tu,
13523 const char *dwo_name, const char *comp_dir)
13525 return lookup_dwo_cutu (&this_tu->per_cu, dwo_name, comp_dir, this_tu->signature, 1);
13528 /* Traversal function for queue_and_load_all_dwo_tus. */
13531 queue_and_load_dwo_tu (void **slot, void *info)
13533 struct dwo_unit *dwo_unit = (struct dwo_unit *) *slot;
13534 struct dwarf2_per_cu_data *per_cu = (struct dwarf2_per_cu_data *) info;
13535 ULONGEST signature = dwo_unit->signature;
13536 struct signatured_type *sig_type =
13537 lookup_dwo_signatured_type (per_cu->cu, signature);
13539 if (sig_type != NULL)
13541 struct dwarf2_per_cu_data *sig_cu = &sig_type->per_cu;
13543 /* We pass NULL for DEPENDENT_CU because we don't yet know if there's
13544 a real dependency of PER_CU on SIG_TYPE. That is detected later
13545 while processing PER_CU. */
13546 if (maybe_queue_comp_unit (NULL, sig_cu, per_cu->cu->language))
13547 load_full_type_unit (sig_cu);
13548 VEC_safe_push (dwarf2_per_cu_ptr, per_cu->imported_symtabs, sig_cu);
13554 /* Queue all TUs contained in the DWO of PER_CU to be read in.
13555 The DWO may have the only definition of the type, though it may not be
13556 referenced anywhere in PER_CU. Thus we have to load *all* its TUs.
13557 http://sourceware.org/bugzilla/show_bug.cgi?id=15021 */
13560 queue_and_load_all_dwo_tus (struct dwarf2_per_cu_data *per_cu)
13562 struct dwo_unit *dwo_unit;
13563 struct dwo_file *dwo_file;
13565 gdb_assert (!per_cu->is_debug_types);
13566 gdb_assert (get_dwp_file (per_cu->dwarf2_per_objfile) == NULL);
13567 gdb_assert (per_cu->cu != NULL);
13569 dwo_unit = per_cu->cu->dwo_unit;
13570 gdb_assert (dwo_unit != NULL);
13572 dwo_file = dwo_unit->dwo_file;
13573 if (dwo_file->tus != NULL)
13574 htab_traverse_noresize (dwo_file->tus, queue_and_load_dwo_tu, per_cu);
13577 /* Free all resources associated with DWO_FILE.
13578 Close the DWO file and munmap the sections.
13579 All memory should be on the objfile obstack. */
13582 free_dwo_file (struct dwo_file *dwo_file, struct objfile *objfile)
13585 /* Note: dbfd is NULL for virtual DWO files. */
13586 gdb_bfd_unref (dwo_file->dbfd);
13588 VEC_free (dwarf2_section_info_def, dwo_file->sections.types);
13591 /* Wrapper for free_dwo_file for use in cleanups. */
13594 free_dwo_file_cleanup (void *arg)
13596 struct free_dwo_file_cleanup_data *data
13597 = (struct free_dwo_file_cleanup_data *) arg;
13598 struct objfile *objfile = data->dwarf2_per_objfile->objfile;
13600 free_dwo_file (data->dwo_file, objfile);
13605 /* Traversal function for free_dwo_files. */
13608 free_dwo_file_from_slot (void **slot, void *info)
13610 struct dwo_file *dwo_file = (struct dwo_file *) *slot;
13611 struct objfile *objfile = (struct objfile *) info;
13613 free_dwo_file (dwo_file, objfile);
13618 /* Free all resources associated with DWO_FILES. */
13621 free_dwo_files (htab_t dwo_files, struct objfile *objfile)
13623 htab_traverse_noresize (dwo_files, free_dwo_file_from_slot, objfile);
13626 /* Read in various DIEs. */
13628 /* DW_AT_abstract_origin inherits whole DIEs (not just their attributes).
13629 Inherit only the children of the DW_AT_abstract_origin DIE not being
13630 already referenced by DW_AT_abstract_origin from the children of the
13634 inherit_abstract_dies (struct die_info *die, struct dwarf2_cu *cu)
13636 struct die_info *child_die;
13637 sect_offset *offsetp;
13638 /* Parent of DIE - referenced by DW_AT_abstract_origin. */
13639 struct die_info *origin_die;
13640 /* Iterator of the ORIGIN_DIE children. */
13641 struct die_info *origin_child_die;
13642 struct attribute *attr;
13643 struct dwarf2_cu *origin_cu;
13644 struct pending **origin_previous_list_in_scope;
13646 attr = dwarf2_attr (die, DW_AT_abstract_origin, cu);
13650 /* Note that following die references may follow to a die in a
13654 origin_die = follow_die_ref (die, attr, &origin_cu);
13656 /* We're inheriting ORIGIN's children into the scope we'd put DIE's
13658 origin_previous_list_in_scope = origin_cu->list_in_scope;
13659 origin_cu->list_in_scope = cu->list_in_scope;
13661 if (die->tag != origin_die->tag
13662 && !(die->tag == DW_TAG_inlined_subroutine
13663 && origin_die->tag == DW_TAG_subprogram))
13664 complaint (&symfile_complaints,
13665 _("DIE 0x%x and its abstract origin 0x%x have different tags"),
13666 to_underlying (die->sect_off),
13667 to_underlying (origin_die->sect_off));
13669 std::vector<sect_offset> offsets;
13671 for (child_die = die->child;
13672 child_die && child_die->tag;
13673 child_die = sibling_die (child_die))
13675 struct die_info *child_origin_die;
13676 struct dwarf2_cu *child_origin_cu;
13678 /* We are trying to process concrete instance entries:
13679 DW_TAG_call_site DIEs indeed have a DW_AT_abstract_origin tag, but
13680 it's not relevant to our analysis here. i.e. detecting DIEs that are
13681 present in the abstract instance but not referenced in the concrete
13683 if (child_die->tag == DW_TAG_call_site
13684 || child_die->tag == DW_TAG_GNU_call_site)
13687 /* For each CHILD_DIE, find the corresponding child of
13688 ORIGIN_DIE. If there is more than one layer of
13689 DW_AT_abstract_origin, follow them all; there shouldn't be,
13690 but GCC versions at least through 4.4 generate this (GCC PR
13692 child_origin_die = child_die;
13693 child_origin_cu = cu;
13696 attr = dwarf2_attr (child_origin_die, DW_AT_abstract_origin,
13700 child_origin_die = follow_die_ref (child_origin_die, attr,
13704 /* According to DWARF3 3.3.8.2 #3 new entries without their abstract
13705 counterpart may exist. */
13706 if (child_origin_die != child_die)
13708 if (child_die->tag != child_origin_die->tag
13709 && !(child_die->tag == DW_TAG_inlined_subroutine
13710 && child_origin_die->tag == DW_TAG_subprogram))
13711 complaint (&symfile_complaints,
13712 _("Child DIE 0x%x and its abstract origin 0x%x have "
13714 to_underlying (child_die->sect_off),
13715 to_underlying (child_origin_die->sect_off));
13716 if (child_origin_die->parent != origin_die)
13717 complaint (&symfile_complaints,
13718 _("Child DIE 0x%x and its abstract origin 0x%x have "
13719 "different parents"),
13720 to_underlying (child_die->sect_off),
13721 to_underlying (child_origin_die->sect_off));
13723 offsets.push_back (child_origin_die->sect_off);
13726 std::sort (offsets.begin (), offsets.end ());
13727 sect_offset *offsets_end = offsets.data () + offsets.size ();
13728 for (offsetp = offsets.data () + 1; offsetp < offsets_end; offsetp++)
13729 if (offsetp[-1] == *offsetp)
13730 complaint (&symfile_complaints,
13731 _("Multiple children of DIE 0x%x refer "
13732 "to DIE 0x%x as their abstract origin"),
13733 to_underlying (die->sect_off), to_underlying (*offsetp));
13735 offsetp = offsets.data ();
13736 origin_child_die = origin_die->child;
13737 while (origin_child_die && origin_child_die->tag)
13739 /* Is ORIGIN_CHILD_DIE referenced by any of the DIE children? */
13740 while (offsetp < offsets_end
13741 && *offsetp < origin_child_die->sect_off)
13743 if (offsetp >= offsets_end
13744 || *offsetp > origin_child_die->sect_off)
13746 /* Found that ORIGIN_CHILD_DIE is really not referenced.
13747 Check whether we're already processing ORIGIN_CHILD_DIE.
13748 This can happen with mutually referenced abstract_origins.
13750 if (!origin_child_die->in_process)
13751 process_die (origin_child_die, origin_cu);
13753 origin_child_die = sibling_die (origin_child_die);
13755 origin_cu->list_in_scope = origin_previous_list_in_scope;
13759 read_func_scope (struct die_info *die, struct dwarf2_cu *cu)
13761 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
13762 struct gdbarch *gdbarch = get_objfile_arch (objfile);
13763 struct context_stack *newobj;
13766 struct die_info *child_die;
13767 struct attribute *attr, *call_line, *call_file;
13769 CORE_ADDR baseaddr;
13770 struct block *block;
13771 int inlined_func = (die->tag == DW_TAG_inlined_subroutine);
13772 std::vector<struct symbol *> template_args;
13773 struct template_symbol *templ_func = NULL;
13777 /* If we do not have call site information, we can't show the
13778 caller of this inlined function. That's too confusing, so
13779 only use the scope for local variables. */
13780 call_line = dwarf2_attr (die, DW_AT_call_line, cu);
13781 call_file = dwarf2_attr (die, DW_AT_call_file, cu);
13782 if (call_line == NULL || call_file == NULL)
13784 read_lexical_block_scope (die, cu);
13789 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
13791 name = dwarf2_name (die, cu);
13793 /* Ignore functions with missing or empty names. These are actually
13794 illegal according to the DWARF standard. */
13797 complaint (&symfile_complaints,
13798 _("missing name for subprogram DIE at %d"),
13799 to_underlying (die->sect_off));
13803 /* Ignore functions with missing or invalid low and high pc attributes. */
13804 if (dwarf2_get_pc_bounds (die, &lowpc, &highpc, cu, NULL)
13805 <= PC_BOUNDS_INVALID)
13807 attr = dwarf2_attr (die, DW_AT_external, cu);
13808 if (!attr || !DW_UNSND (attr))
13809 complaint (&symfile_complaints,
13810 _("cannot get low and high bounds "
13811 "for subprogram DIE at %d"),
13812 to_underlying (die->sect_off));
13816 lowpc = gdbarch_adjust_dwarf2_addr (gdbarch, lowpc + baseaddr);
13817 highpc = gdbarch_adjust_dwarf2_addr (gdbarch, highpc + baseaddr);
13819 /* If we have any template arguments, then we must allocate a
13820 different sort of symbol. */
13821 for (child_die = die->child; child_die; child_die = sibling_die (child_die))
13823 if (child_die->tag == DW_TAG_template_type_param
13824 || child_die->tag == DW_TAG_template_value_param)
13826 templ_func = allocate_template_symbol (objfile);
13827 templ_func->subclass = SYMBOL_TEMPLATE;
13832 newobj = push_context (0, lowpc);
13833 newobj->name = new_symbol (die, read_type_die (die, cu), cu,
13834 (struct symbol *) templ_func);
13836 /* If there is a location expression for DW_AT_frame_base, record
13838 attr = dwarf2_attr (die, DW_AT_frame_base, cu);
13840 dwarf2_symbol_mark_computed (attr, newobj->name, cu, 1);
13842 /* If there is a location for the static link, record it. */
13843 newobj->static_link = NULL;
13844 attr = dwarf2_attr (die, DW_AT_static_link, cu);
13847 newobj->static_link
13848 = XOBNEW (&objfile->objfile_obstack, struct dynamic_prop);
13849 attr_to_dynamic_prop (attr, die, cu, newobj->static_link);
13852 cu->list_in_scope = &local_symbols;
13854 if (die->child != NULL)
13856 child_die = die->child;
13857 while (child_die && child_die->tag)
13859 if (child_die->tag == DW_TAG_template_type_param
13860 || child_die->tag == DW_TAG_template_value_param)
13862 struct symbol *arg = new_symbol (child_die, NULL, cu);
13865 template_args.push_back (arg);
13868 process_die (child_die, cu);
13869 child_die = sibling_die (child_die);
13873 inherit_abstract_dies (die, cu);
13875 /* If we have a DW_AT_specification, we might need to import using
13876 directives from the context of the specification DIE. See the
13877 comment in determine_prefix. */
13878 if (cu->language == language_cplus
13879 && dwarf2_attr (die, DW_AT_specification, cu))
13881 struct dwarf2_cu *spec_cu = cu;
13882 struct die_info *spec_die = die_specification (die, &spec_cu);
13886 child_die = spec_die->child;
13887 while (child_die && child_die->tag)
13889 if (child_die->tag == DW_TAG_imported_module)
13890 process_die (child_die, spec_cu);
13891 child_die = sibling_die (child_die);
13894 /* In some cases, GCC generates specification DIEs that
13895 themselves contain DW_AT_specification attributes. */
13896 spec_die = die_specification (spec_die, &spec_cu);
13900 newobj = pop_context ();
13901 /* Make a block for the local symbols within. */
13902 block = finish_block (newobj->name, &local_symbols, newobj->old_blocks,
13903 newobj->static_link, lowpc, highpc);
13905 /* For C++, set the block's scope. */
13906 if ((cu->language == language_cplus
13907 || cu->language == language_fortran
13908 || cu->language == language_d
13909 || cu->language == language_rust)
13910 && cu->processing_has_namespace_info)
13911 block_set_scope (block, determine_prefix (die, cu),
13912 &objfile->objfile_obstack);
13914 /* If we have address ranges, record them. */
13915 dwarf2_record_block_ranges (die, block, baseaddr, cu);
13917 gdbarch_make_symbol_special (gdbarch, newobj->name, objfile);
13919 /* Attach template arguments to function. */
13920 if (!template_args.empty ())
13922 gdb_assert (templ_func != NULL);
13924 templ_func->n_template_arguments = template_args.size ();
13925 templ_func->template_arguments
13926 = XOBNEWVEC (&objfile->objfile_obstack, struct symbol *,
13927 templ_func->n_template_arguments);
13928 memcpy (templ_func->template_arguments,
13929 template_args.data (),
13930 (templ_func->n_template_arguments * sizeof (struct symbol *)));
13933 /* In C++, we can have functions nested inside functions (e.g., when
13934 a function declares a class that has methods). This means that
13935 when we finish processing a function scope, we may need to go
13936 back to building a containing block's symbol lists. */
13937 local_symbols = newobj->locals;
13938 local_using_directives = newobj->local_using_directives;
13940 /* If we've finished processing a top-level function, subsequent
13941 symbols go in the file symbol list. */
13942 if (outermost_context_p ())
13943 cu->list_in_scope = &file_symbols;
13946 /* Process all the DIES contained within a lexical block scope. Start
13947 a new scope, process the dies, and then close the scope. */
13950 read_lexical_block_scope (struct die_info *die, struct dwarf2_cu *cu)
13952 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
13953 struct gdbarch *gdbarch = get_objfile_arch (objfile);
13954 struct context_stack *newobj;
13955 CORE_ADDR lowpc, highpc;
13956 struct die_info *child_die;
13957 CORE_ADDR baseaddr;
13959 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
13961 /* Ignore blocks with missing or invalid low and high pc attributes. */
13962 /* ??? Perhaps consider discontiguous blocks defined by DW_AT_ranges
13963 as multiple lexical blocks? Handling children in a sane way would
13964 be nasty. Might be easier to properly extend generic blocks to
13965 describe ranges. */
13966 switch (dwarf2_get_pc_bounds (die, &lowpc, &highpc, cu, NULL))
13968 case PC_BOUNDS_NOT_PRESENT:
13969 /* DW_TAG_lexical_block has no attributes, process its children as if
13970 there was no wrapping by that DW_TAG_lexical_block.
13971 GCC does no longer produces such DWARF since GCC r224161. */
13972 for (child_die = die->child;
13973 child_die != NULL && child_die->tag;
13974 child_die = sibling_die (child_die))
13975 process_die (child_die, cu);
13977 case PC_BOUNDS_INVALID:
13980 lowpc = gdbarch_adjust_dwarf2_addr (gdbarch, lowpc + baseaddr);
13981 highpc = gdbarch_adjust_dwarf2_addr (gdbarch, highpc + baseaddr);
13983 push_context (0, lowpc);
13984 if (die->child != NULL)
13986 child_die = die->child;
13987 while (child_die && child_die->tag)
13989 process_die (child_die, cu);
13990 child_die = sibling_die (child_die);
13993 inherit_abstract_dies (die, cu);
13994 newobj = pop_context ();
13996 if (local_symbols != NULL || local_using_directives != NULL)
13998 struct block *block
13999 = finish_block (0, &local_symbols, newobj->old_blocks, NULL,
14000 newobj->start_addr, highpc);
14002 /* Note that recording ranges after traversing children, as we
14003 do here, means that recording a parent's ranges entails
14004 walking across all its children's ranges as they appear in
14005 the address map, which is quadratic behavior.
14007 It would be nicer to record the parent's ranges before
14008 traversing its children, simply overriding whatever you find
14009 there. But since we don't even decide whether to create a
14010 block until after we've traversed its children, that's hard
14012 dwarf2_record_block_ranges (die, block, baseaddr, cu);
14014 local_symbols = newobj->locals;
14015 local_using_directives = newobj->local_using_directives;
14018 /* Read in DW_TAG_call_site and insert it to CU->call_site_htab. */
14021 read_call_site_scope (struct die_info *die, struct dwarf2_cu *cu)
14023 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
14024 struct gdbarch *gdbarch = get_objfile_arch (objfile);
14025 CORE_ADDR pc, baseaddr;
14026 struct attribute *attr;
14027 struct call_site *call_site, call_site_local;
14030 struct die_info *child_die;
14032 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
14034 attr = dwarf2_attr (die, DW_AT_call_return_pc, cu);
14037 /* This was a pre-DWARF-5 GNU extension alias
14038 for DW_AT_call_return_pc. */
14039 attr = dwarf2_attr (die, DW_AT_low_pc, cu);
14043 complaint (&symfile_complaints,
14044 _("missing DW_AT_call_return_pc for DW_TAG_call_site "
14045 "DIE 0x%x [in module %s]"),
14046 to_underlying (die->sect_off), objfile_name (objfile));
14049 pc = attr_value_as_address (attr) + baseaddr;
14050 pc = gdbarch_adjust_dwarf2_addr (gdbarch, pc);
14052 if (cu->call_site_htab == NULL)
14053 cu->call_site_htab = htab_create_alloc_ex (16, core_addr_hash, core_addr_eq,
14054 NULL, &objfile->objfile_obstack,
14055 hashtab_obstack_allocate, NULL);
14056 call_site_local.pc = pc;
14057 slot = htab_find_slot (cu->call_site_htab, &call_site_local, INSERT);
14060 complaint (&symfile_complaints,
14061 _("Duplicate PC %s for DW_TAG_call_site "
14062 "DIE 0x%x [in module %s]"),
14063 paddress (gdbarch, pc), to_underlying (die->sect_off),
14064 objfile_name (objfile));
14068 /* Count parameters at the caller. */
14071 for (child_die = die->child; child_die && child_die->tag;
14072 child_die = sibling_die (child_die))
14074 if (child_die->tag != DW_TAG_call_site_parameter
14075 && child_die->tag != DW_TAG_GNU_call_site_parameter)
14077 complaint (&symfile_complaints,
14078 _("Tag %d is not DW_TAG_call_site_parameter in "
14079 "DW_TAG_call_site child DIE 0x%x [in module %s]"),
14080 child_die->tag, to_underlying (child_die->sect_off),
14081 objfile_name (objfile));
14089 = ((struct call_site *)
14090 obstack_alloc (&objfile->objfile_obstack,
14091 sizeof (*call_site)
14092 + (sizeof (*call_site->parameter) * (nparams - 1))));
14094 memset (call_site, 0, sizeof (*call_site) - sizeof (*call_site->parameter));
14095 call_site->pc = pc;
14097 if (dwarf2_flag_true_p (die, DW_AT_call_tail_call, cu)
14098 || dwarf2_flag_true_p (die, DW_AT_GNU_tail_call, cu))
14100 struct die_info *func_die;
14102 /* Skip also over DW_TAG_inlined_subroutine. */
14103 for (func_die = die->parent;
14104 func_die && func_die->tag != DW_TAG_subprogram
14105 && func_die->tag != DW_TAG_subroutine_type;
14106 func_die = func_die->parent);
14108 /* DW_AT_call_all_calls is a superset
14109 of DW_AT_call_all_tail_calls. */
14111 && !dwarf2_flag_true_p (func_die, DW_AT_call_all_calls, cu)
14112 && !dwarf2_flag_true_p (func_die, DW_AT_GNU_all_call_sites, cu)
14113 && !dwarf2_flag_true_p (func_die, DW_AT_call_all_tail_calls, cu)
14114 && !dwarf2_flag_true_p (func_die, DW_AT_GNU_all_tail_call_sites, cu))
14116 /* TYPE_TAIL_CALL_LIST is not interesting in functions where it is
14117 not complete. But keep CALL_SITE for look ups via call_site_htab,
14118 both the initial caller containing the real return address PC and
14119 the final callee containing the current PC of a chain of tail
14120 calls do not need to have the tail call list complete. But any
14121 function candidate for a virtual tail call frame searched via
14122 TYPE_TAIL_CALL_LIST must have the tail call list complete to be
14123 determined unambiguously. */
14127 struct type *func_type = NULL;
14130 func_type = get_die_type (func_die, cu);
14131 if (func_type != NULL)
14133 gdb_assert (TYPE_CODE (func_type) == TYPE_CODE_FUNC);
14135 /* Enlist this call site to the function. */
14136 call_site->tail_call_next = TYPE_TAIL_CALL_LIST (func_type);
14137 TYPE_TAIL_CALL_LIST (func_type) = call_site;
14140 complaint (&symfile_complaints,
14141 _("Cannot find function owning DW_TAG_call_site "
14142 "DIE 0x%x [in module %s]"),
14143 to_underlying (die->sect_off), objfile_name (objfile));
14147 attr = dwarf2_attr (die, DW_AT_call_target, cu);
14149 attr = dwarf2_attr (die, DW_AT_GNU_call_site_target, cu);
14151 attr = dwarf2_attr (die, DW_AT_call_origin, cu);
14154 /* This was a pre-DWARF-5 GNU extension alias for DW_AT_call_origin. */
14155 attr = dwarf2_attr (die, DW_AT_abstract_origin, cu);
14157 SET_FIELD_DWARF_BLOCK (call_site->target, NULL);
14158 if (!attr || (attr_form_is_block (attr) && DW_BLOCK (attr)->size == 0))
14159 /* Keep NULL DWARF_BLOCK. */;
14160 else if (attr_form_is_block (attr))
14162 struct dwarf2_locexpr_baton *dlbaton;
14164 dlbaton = XOBNEW (&objfile->objfile_obstack, struct dwarf2_locexpr_baton);
14165 dlbaton->data = DW_BLOCK (attr)->data;
14166 dlbaton->size = DW_BLOCK (attr)->size;
14167 dlbaton->per_cu = cu->per_cu;
14169 SET_FIELD_DWARF_BLOCK (call_site->target, dlbaton);
14171 else if (attr_form_is_ref (attr))
14173 struct dwarf2_cu *target_cu = cu;
14174 struct die_info *target_die;
14176 target_die = follow_die_ref (die, attr, &target_cu);
14177 gdb_assert (target_cu->per_cu->dwarf2_per_objfile->objfile == objfile);
14178 if (die_is_declaration (target_die, target_cu))
14180 const char *target_physname;
14182 /* Prefer the mangled name; otherwise compute the demangled one. */
14183 target_physname = dw2_linkage_name (target_die, target_cu);
14184 if (target_physname == NULL)
14185 target_physname = dwarf2_physname (NULL, target_die, target_cu);
14186 if (target_physname == NULL)
14187 complaint (&symfile_complaints,
14188 _("DW_AT_call_target target DIE has invalid "
14189 "physname, for referencing DIE 0x%x [in module %s]"),
14190 to_underlying (die->sect_off), objfile_name (objfile));
14192 SET_FIELD_PHYSNAME (call_site->target, target_physname);
14198 /* DW_AT_entry_pc should be preferred. */
14199 if (dwarf2_get_pc_bounds (target_die, &lowpc, NULL, target_cu, NULL)
14200 <= PC_BOUNDS_INVALID)
14201 complaint (&symfile_complaints,
14202 _("DW_AT_call_target target DIE has invalid "
14203 "low pc, for referencing DIE 0x%x [in module %s]"),
14204 to_underlying (die->sect_off), objfile_name (objfile));
14207 lowpc = gdbarch_adjust_dwarf2_addr (gdbarch, lowpc + baseaddr);
14208 SET_FIELD_PHYSADDR (call_site->target, lowpc);
14213 complaint (&symfile_complaints,
14214 _("DW_TAG_call_site DW_AT_call_target is neither "
14215 "block nor reference, for DIE 0x%x [in module %s]"),
14216 to_underlying (die->sect_off), objfile_name (objfile));
14218 call_site->per_cu = cu->per_cu;
14220 for (child_die = die->child;
14221 child_die && child_die->tag;
14222 child_die = sibling_die (child_die))
14224 struct call_site_parameter *parameter;
14225 struct attribute *loc, *origin;
14227 if (child_die->tag != DW_TAG_call_site_parameter
14228 && child_die->tag != DW_TAG_GNU_call_site_parameter)
14230 /* Already printed the complaint above. */
14234 gdb_assert (call_site->parameter_count < nparams);
14235 parameter = &call_site->parameter[call_site->parameter_count];
14237 /* DW_AT_location specifies the register number or DW_AT_abstract_origin
14238 specifies DW_TAG_formal_parameter. Value of the data assumed for the
14239 register is contained in DW_AT_call_value. */
14241 loc = dwarf2_attr (child_die, DW_AT_location, cu);
14242 origin = dwarf2_attr (child_die, DW_AT_call_parameter, cu);
14243 if (origin == NULL)
14245 /* This was a pre-DWARF-5 GNU extension alias
14246 for DW_AT_call_parameter. */
14247 origin = dwarf2_attr (child_die, DW_AT_abstract_origin, cu);
14249 if (loc == NULL && origin != NULL && attr_form_is_ref (origin))
14251 parameter->kind = CALL_SITE_PARAMETER_PARAM_OFFSET;
14253 sect_offset sect_off
14254 = (sect_offset) dwarf2_get_ref_die_offset (origin);
14255 if (!offset_in_cu_p (&cu->header, sect_off))
14257 /* As DW_OP_GNU_parameter_ref uses CU-relative offset this
14258 binding can be done only inside one CU. Such referenced DIE
14259 therefore cannot be even moved to DW_TAG_partial_unit. */
14260 complaint (&symfile_complaints,
14261 _("DW_AT_call_parameter offset is not in CU for "
14262 "DW_TAG_call_site child DIE 0x%x [in module %s]"),
14263 to_underlying (child_die->sect_off),
14264 objfile_name (objfile));
14267 parameter->u.param_cu_off
14268 = (cu_offset) (sect_off - cu->header.sect_off);
14270 else if (loc == NULL || origin != NULL || !attr_form_is_block (loc))
14272 complaint (&symfile_complaints,
14273 _("No DW_FORM_block* DW_AT_location for "
14274 "DW_TAG_call_site child DIE 0x%x [in module %s]"),
14275 to_underlying (child_die->sect_off), objfile_name (objfile));
14280 parameter->u.dwarf_reg = dwarf_block_to_dwarf_reg
14281 (DW_BLOCK (loc)->data, &DW_BLOCK (loc)->data[DW_BLOCK (loc)->size]);
14282 if (parameter->u.dwarf_reg != -1)
14283 parameter->kind = CALL_SITE_PARAMETER_DWARF_REG;
14284 else if (dwarf_block_to_sp_offset (gdbarch, DW_BLOCK (loc)->data,
14285 &DW_BLOCK (loc)->data[DW_BLOCK (loc)->size],
14286 ¶meter->u.fb_offset))
14287 parameter->kind = CALL_SITE_PARAMETER_FB_OFFSET;
14290 complaint (&symfile_complaints,
14291 _("Only single DW_OP_reg or DW_OP_fbreg is supported "
14292 "for DW_FORM_block* DW_AT_location is supported for "
14293 "DW_TAG_call_site child DIE 0x%x "
14295 to_underlying (child_die->sect_off),
14296 objfile_name (objfile));
14301 attr = dwarf2_attr (child_die, DW_AT_call_value, cu);
14303 attr = dwarf2_attr (child_die, DW_AT_GNU_call_site_value, cu);
14304 if (!attr_form_is_block (attr))
14306 complaint (&symfile_complaints,
14307 _("No DW_FORM_block* DW_AT_call_value for "
14308 "DW_TAG_call_site child DIE 0x%x [in module %s]"),
14309 to_underlying (child_die->sect_off),
14310 objfile_name (objfile));
14313 parameter->value = DW_BLOCK (attr)->data;
14314 parameter->value_size = DW_BLOCK (attr)->size;
14316 /* Parameters are not pre-cleared by memset above. */
14317 parameter->data_value = NULL;
14318 parameter->data_value_size = 0;
14319 call_site->parameter_count++;
14321 attr = dwarf2_attr (child_die, DW_AT_call_data_value, cu);
14323 attr = dwarf2_attr (child_die, DW_AT_GNU_call_site_data_value, cu);
14326 if (!attr_form_is_block (attr))
14327 complaint (&symfile_complaints,
14328 _("No DW_FORM_block* DW_AT_call_data_value for "
14329 "DW_TAG_call_site child DIE 0x%x [in module %s]"),
14330 to_underlying (child_die->sect_off),
14331 objfile_name (objfile));
14334 parameter->data_value = DW_BLOCK (attr)->data;
14335 parameter->data_value_size = DW_BLOCK (attr)->size;
14341 /* Helper function for read_variable. If DIE represents a virtual
14342 table, then return the type of the concrete object that is
14343 associated with the virtual table. Otherwise, return NULL. */
14345 static struct type *
14346 rust_containing_type (struct die_info *die, struct dwarf2_cu *cu)
14348 struct attribute *attr = dwarf2_attr (die, DW_AT_type, cu);
14352 /* Find the type DIE. */
14353 struct die_info *type_die = NULL;
14354 struct dwarf2_cu *type_cu = cu;
14356 if (attr_form_is_ref (attr))
14357 type_die = follow_die_ref (die, attr, &type_cu);
14358 if (type_die == NULL)
14361 if (dwarf2_attr (type_die, DW_AT_containing_type, type_cu) == NULL)
14363 return die_containing_type (type_die, type_cu);
14366 /* Read a variable (DW_TAG_variable) DIE and create a new symbol. */
14369 read_variable (struct die_info *die, struct dwarf2_cu *cu)
14371 struct rust_vtable_symbol *storage = NULL;
14373 if (cu->language == language_rust)
14375 struct type *containing_type = rust_containing_type (die, cu);
14377 if (containing_type != NULL)
14379 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
14381 storage = OBSTACK_ZALLOC (&objfile->objfile_obstack,
14382 struct rust_vtable_symbol);
14383 initialize_objfile_symbol (storage);
14384 storage->concrete_type = containing_type;
14385 storage->subclass = SYMBOL_RUST_VTABLE;
14389 new_symbol (die, NULL, cu, storage);
14392 /* Call CALLBACK from DW_AT_ranges attribute value OFFSET
14393 reading .debug_rnglists.
14394 Callback's type should be:
14395 void (CORE_ADDR range_beginning, CORE_ADDR range_end)
14396 Return true if the attributes are present and valid, otherwise,
14399 template <typename Callback>
14401 dwarf2_rnglists_process (unsigned offset, struct dwarf2_cu *cu,
14402 Callback &&callback)
14404 struct dwarf2_per_objfile *dwarf2_per_objfile
14405 = cu->per_cu->dwarf2_per_objfile;
14406 struct objfile *objfile = dwarf2_per_objfile->objfile;
14407 bfd *obfd = objfile->obfd;
14408 /* Base address selection entry. */
14411 const gdb_byte *buffer;
14412 CORE_ADDR baseaddr;
14413 bool overflow = false;
14415 found_base = cu->base_known;
14416 base = cu->base_address;
14418 dwarf2_read_section (objfile, &dwarf2_per_objfile->rnglists);
14419 if (offset >= dwarf2_per_objfile->rnglists.size)
14421 complaint (&symfile_complaints,
14422 _("Offset %d out of bounds for DW_AT_ranges attribute"),
14426 buffer = dwarf2_per_objfile->rnglists.buffer + offset;
14428 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
14432 /* Initialize it due to a false compiler warning. */
14433 CORE_ADDR range_beginning = 0, range_end = 0;
14434 const gdb_byte *buf_end = (dwarf2_per_objfile->rnglists.buffer
14435 + dwarf2_per_objfile->rnglists.size);
14436 unsigned int bytes_read;
14438 if (buffer == buf_end)
14443 const auto rlet = static_cast<enum dwarf_range_list_entry>(*buffer++);
14446 case DW_RLE_end_of_list:
14448 case DW_RLE_base_address:
14449 if (buffer + cu->header.addr_size > buf_end)
14454 base = read_address (obfd, buffer, cu, &bytes_read);
14456 buffer += bytes_read;
14458 case DW_RLE_start_length:
14459 if (buffer + cu->header.addr_size > buf_end)
14464 range_beginning = read_address (obfd, buffer, cu, &bytes_read);
14465 buffer += bytes_read;
14466 range_end = (range_beginning
14467 + read_unsigned_leb128 (obfd, buffer, &bytes_read));
14468 buffer += bytes_read;
14469 if (buffer > buf_end)
14475 case DW_RLE_offset_pair:
14476 range_beginning = read_unsigned_leb128 (obfd, buffer, &bytes_read);
14477 buffer += bytes_read;
14478 if (buffer > buf_end)
14483 range_end = read_unsigned_leb128 (obfd, buffer, &bytes_read);
14484 buffer += bytes_read;
14485 if (buffer > buf_end)
14491 case DW_RLE_start_end:
14492 if (buffer + 2 * cu->header.addr_size > buf_end)
14497 range_beginning = read_address (obfd, buffer, cu, &bytes_read);
14498 buffer += bytes_read;
14499 range_end = read_address (obfd, buffer, cu, &bytes_read);
14500 buffer += bytes_read;
14503 complaint (&symfile_complaints,
14504 _("Invalid .debug_rnglists data (no base address)"));
14507 if (rlet == DW_RLE_end_of_list || overflow)
14509 if (rlet == DW_RLE_base_address)
14514 /* We have no valid base address for the ranges
14516 complaint (&symfile_complaints,
14517 _("Invalid .debug_rnglists data (no base address)"));
14521 if (range_beginning > range_end)
14523 /* Inverted range entries are invalid. */
14524 complaint (&symfile_complaints,
14525 _("Invalid .debug_rnglists data (inverted range)"));
14529 /* Empty range entries have no effect. */
14530 if (range_beginning == range_end)
14533 range_beginning += base;
14536 /* A not-uncommon case of bad debug info.
14537 Don't pollute the addrmap with bad data. */
14538 if (range_beginning + baseaddr == 0
14539 && !dwarf2_per_objfile->has_section_at_zero)
14541 complaint (&symfile_complaints,
14542 _(".debug_rnglists entry has start address of zero"
14543 " [in module %s]"), objfile_name (objfile));
14547 callback (range_beginning, range_end);
14552 complaint (&symfile_complaints,
14553 _("Offset %d is not terminated "
14554 "for DW_AT_ranges attribute"),
14562 /* Call CALLBACK from DW_AT_ranges attribute value OFFSET reading .debug_ranges.
14563 Callback's type should be:
14564 void (CORE_ADDR range_beginning, CORE_ADDR range_end)
14565 Return 1 if the attributes are present and valid, otherwise, return 0. */
14567 template <typename Callback>
14569 dwarf2_ranges_process (unsigned offset, struct dwarf2_cu *cu,
14570 Callback &&callback)
14572 struct dwarf2_per_objfile *dwarf2_per_objfile
14573 = cu->per_cu->dwarf2_per_objfile;
14574 struct objfile *objfile = dwarf2_per_objfile->objfile;
14575 struct comp_unit_head *cu_header = &cu->header;
14576 bfd *obfd = objfile->obfd;
14577 unsigned int addr_size = cu_header->addr_size;
14578 CORE_ADDR mask = ~(~(CORE_ADDR)1 << (addr_size * 8 - 1));
14579 /* Base address selection entry. */
14582 unsigned int dummy;
14583 const gdb_byte *buffer;
14584 CORE_ADDR baseaddr;
14586 if (cu_header->version >= 5)
14587 return dwarf2_rnglists_process (offset, cu, callback);
14589 found_base = cu->base_known;
14590 base = cu->base_address;
14592 dwarf2_read_section (objfile, &dwarf2_per_objfile->ranges);
14593 if (offset >= dwarf2_per_objfile->ranges.size)
14595 complaint (&symfile_complaints,
14596 _("Offset %d out of bounds for DW_AT_ranges attribute"),
14600 buffer = dwarf2_per_objfile->ranges.buffer + offset;
14602 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
14606 CORE_ADDR range_beginning, range_end;
14608 range_beginning = read_address (obfd, buffer, cu, &dummy);
14609 buffer += addr_size;
14610 range_end = read_address (obfd, buffer, cu, &dummy);
14611 buffer += addr_size;
14612 offset += 2 * addr_size;
14614 /* An end of list marker is a pair of zero addresses. */
14615 if (range_beginning == 0 && range_end == 0)
14616 /* Found the end of list entry. */
14619 /* Each base address selection entry is a pair of 2 values.
14620 The first is the largest possible address, the second is
14621 the base address. Check for a base address here. */
14622 if ((range_beginning & mask) == mask)
14624 /* If we found the largest possible address, then we already
14625 have the base address in range_end. */
14633 /* We have no valid base address for the ranges
14635 complaint (&symfile_complaints,
14636 _("Invalid .debug_ranges data (no base address)"));
14640 if (range_beginning > range_end)
14642 /* Inverted range entries are invalid. */
14643 complaint (&symfile_complaints,
14644 _("Invalid .debug_ranges data (inverted range)"));
14648 /* Empty range entries have no effect. */
14649 if (range_beginning == range_end)
14652 range_beginning += base;
14655 /* A not-uncommon case of bad debug info.
14656 Don't pollute the addrmap with bad data. */
14657 if (range_beginning + baseaddr == 0
14658 && !dwarf2_per_objfile->has_section_at_zero)
14660 complaint (&symfile_complaints,
14661 _(".debug_ranges entry has start address of zero"
14662 " [in module %s]"), objfile_name (objfile));
14666 callback (range_beginning, range_end);
14672 /* Get low and high pc attributes from DW_AT_ranges attribute value OFFSET.
14673 Return 1 if the attributes are present and valid, otherwise, return 0.
14674 If RANGES_PST is not NULL we should setup `objfile->psymtabs_addrmap'. */
14677 dwarf2_ranges_read (unsigned offset, CORE_ADDR *low_return,
14678 CORE_ADDR *high_return, struct dwarf2_cu *cu,
14679 struct partial_symtab *ranges_pst)
14681 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
14682 struct gdbarch *gdbarch = get_objfile_arch (objfile);
14683 const CORE_ADDR baseaddr = ANOFFSET (objfile->section_offsets,
14684 SECT_OFF_TEXT (objfile));
14687 CORE_ADDR high = 0;
14690 retval = dwarf2_ranges_process (offset, cu,
14691 [&] (CORE_ADDR range_beginning, CORE_ADDR range_end)
14693 if (ranges_pst != NULL)
14698 lowpc = gdbarch_adjust_dwarf2_addr (gdbarch,
14699 range_beginning + baseaddr);
14700 highpc = gdbarch_adjust_dwarf2_addr (gdbarch,
14701 range_end + baseaddr);
14702 addrmap_set_empty (objfile->psymtabs_addrmap, lowpc, highpc - 1,
14706 /* FIXME: This is recording everything as a low-high
14707 segment of consecutive addresses. We should have a
14708 data structure for discontiguous block ranges
14712 low = range_beginning;
14718 if (range_beginning < low)
14719 low = range_beginning;
14720 if (range_end > high)
14728 /* If the first entry is an end-of-list marker, the range
14729 describes an empty scope, i.e. no instructions. */
14735 *high_return = high;
14739 /* Get low and high pc attributes from a die. See enum pc_bounds_kind
14740 definition for the return value. *LOWPC and *HIGHPC are set iff
14741 neither PC_BOUNDS_NOT_PRESENT nor PC_BOUNDS_INVALID are returned. */
14743 static enum pc_bounds_kind
14744 dwarf2_get_pc_bounds (struct die_info *die, CORE_ADDR *lowpc,
14745 CORE_ADDR *highpc, struct dwarf2_cu *cu,
14746 struct partial_symtab *pst)
14748 struct dwarf2_per_objfile *dwarf2_per_objfile
14749 = cu->per_cu->dwarf2_per_objfile;
14750 struct attribute *attr;
14751 struct attribute *attr_high;
14753 CORE_ADDR high = 0;
14754 enum pc_bounds_kind ret;
14756 attr_high = dwarf2_attr (die, DW_AT_high_pc, cu);
14759 attr = dwarf2_attr (die, DW_AT_low_pc, cu);
14762 low = attr_value_as_address (attr);
14763 high = attr_value_as_address (attr_high);
14764 if (cu->header.version >= 4 && attr_form_is_constant (attr_high))
14768 /* Found high w/o low attribute. */
14769 return PC_BOUNDS_INVALID;
14771 /* Found consecutive range of addresses. */
14772 ret = PC_BOUNDS_HIGH_LOW;
14776 attr = dwarf2_attr (die, DW_AT_ranges, cu);
14779 /* DW_AT_ranges_base does not apply to DIEs from the DWO skeleton.
14780 We take advantage of the fact that DW_AT_ranges does not appear
14781 in DW_TAG_compile_unit of DWO files. */
14782 int need_ranges_base = die->tag != DW_TAG_compile_unit;
14783 unsigned int ranges_offset = (DW_UNSND (attr)
14784 + (need_ranges_base
14788 /* Value of the DW_AT_ranges attribute is the offset in the
14789 .debug_ranges section. */
14790 if (!dwarf2_ranges_read (ranges_offset, &low, &high, cu, pst))
14791 return PC_BOUNDS_INVALID;
14792 /* Found discontinuous range of addresses. */
14793 ret = PC_BOUNDS_RANGES;
14796 return PC_BOUNDS_NOT_PRESENT;
14799 /* read_partial_die has also the strict LOW < HIGH requirement. */
14801 return PC_BOUNDS_INVALID;
14803 /* When using the GNU linker, .gnu.linkonce. sections are used to
14804 eliminate duplicate copies of functions and vtables and such.
14805 The linker will arbitrarily choose one and discard the others.
14806 The AT_*_pc values for such functions refer to local labels in
14807 these sections. If the section from that file was discarded, the
14808 labels are not in the output, so the relocs get a value of 0.
14809 If this is a discarded function, mark the pc bounds as invalid,
14810 so that GDB will ignore it. */
14811 if (low == 0 && !dwarf2_per_objfile->has_section_at_zero)
14812 return PC_BOUNDS_INVALID;
14820 /* Assuming that DIE represents a subprogram DIE or a lexical block, get
14821 its low and high PC addresses. Do nothing if these addresses could not
14822 be determined. Otherwise, set LOWPC to the low address if it is smaller,
14823 and HIGHPC to the high address if greater than HIGHPC. */
14826 dwarf2_get_subprogram_pc_bounds (struct die_info *die,
14827 CORE_ADDR *lowpc, CORE_ADDR *highpc,
14828 struct dwarf2_cu *cu)
14830 CORE_ADDR low, high;
14831 struct die_info *child = die->child;
14833 if (dwarf2_get_pc_bounds (die, &low, &high, cu, NULL) >= PC_BOUNDS_RANGES)
14835 *lowpc = std::min (*lowpc, low);
14836 *highpc = std::max (*highpc, high);
14839 /* If the language does not allow nested subprograms (either inside
14840 subprograms or lexical blocks), we're done. */
14841 if (cu->language != language_ada)
14844 /* Check all the children of the given DIE. If it contains nested
14845 subprograms, then check their pc bounds. Likewise, we need to
14846 check lexical blocks as well, as they may also contain subprogram
14848 while (child && child->tag)
14850 if (child->tag == DW_TAG_subprogram
14851 || child->tag == DW_TAG_lexical_block)
14852 dwarf2_get_subprogram_pc_bounds (child, lowpc, highpc, cu);
14853 child = sibling_die (child);
14857 /* Get the low and high pc's represented by the scope DIE, and store
14858 them in *LOWPC and *HIGHPC. If the correct values can't be
14859 determined, set *LOWPC to -1 and *HIGHPC to 0. */
14862 get_scope_pc_bounds (struct die_info *die,
14863 CORE_ADDR *lowpc, CORE_ADDR *highpc,
14864 struct dwarf2_cu *cu)
14866 CORE_ADDR best_low = (CORE_ADDR) -1;
14867 CORE_ADDR best_high = (CORE_ADDR) 0;
14868 CORE_ADDR current_low, current_high;
14870 if (dwarf2_get_pc_bounds (die, ¤t_low, ¤t_high, cu, NULL)
14871 >= PC_BOUNDS_RANGES)
14873 best_low = current_low;
14874 best_high = current_high;
14878 struct die_info *child = die->child;
14880 while (child && child->tag)
14882 switch (child->tag) {
14883 case DW_TAG_subprogram:
14884 dwarf2_get_subprogram_pc_bounds (child, &best_low, &best_high, cu);
14886 case DW_TAG_namespace:
14887 case DW_TAG_module:
14888 /* FIXME: carlton/2004-01-16: Should we do this for
14889 DW_TAG_class_type/DW_TAG_structure_type, too? I think
14890 that current GCC's always emit the DIEs corresponding
14891 to definitions of methods of classes as children of a
14892 DW_TAG_compile_unit or DW_TAG_namespace (as opposed to
14893 the DIEs giving the declarations, which could be
14894 anywhere). But I don't see any reason why the
14895 standards says that they have to be there. */
14896 get_scope_pc_bounds (child, ¤t_low, ¤t_high, cu);
14898 if (current_low != ((CORE_ADDR) -1))
14900 best_low = std::min (best_low, current_low);
14901 best_high = std::max (best_high, current_high);
14909 child = sibling_die (child);
14914 *highpc = best_high;
14917 /* Record the address ranges for BLOCK, offset by BASEADDR, as given
14921 dwarf2_record_block_ranges (struct die_info *die, struct block *block,
14922 CORE_ADDR baseaddr, struct dwarf2_cu *cu)
14924 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
14925 struct gdbarch *gdbarch = get_objfile_arch (objfile);
14926 struct attribute *attr;
14927 struct attribute *attr_high;
14929 attr_high = dwarf2_attr (die, DW_AT_high_pc, cu);
14932 attr = dwarf2_attr (die, DW_AT_low_pc, cu);
14935 CORE_ADDR low = attr_value_as_address (attr);
14936 CORE_ADDR high = attr_value_as_address (attr_high);
14938 if (cu->header.version >= 4 && attr_form_is_constant (attr_high))
14941 low = gdbarch_adjust_dwarf2_addr (gdbarch, low + baseaddr);
14942 high = gdbarch_adjust_dwarf2_addr (gdbarch, high + baseaddr);
14943 record_block_range (block, low, high - 1);
14947 attr = dwarf2_attr (die, DW_AT_ranges, cu);
14950 /* DW_AT_ranges_base does not apply to DIEs from the DWO skeleton.
14951 We take advantage of the fact that DW_AT_ranges does not appear
14952 in DW_TAG_compile_unit of DWO files. */
14953 int need_ranges_base = die->tag != DW_TAG_compile_unit;
14955 /* The value of the DW_AT_ranges attribute is the offset of the
14956 address range list in the .debug_ranges section. */
14957 unsigned long offset = (DW_UNSND (attr)
14958 + (need_ranges_base ? cu->ranges_base : 0));
14959 const gdb_byte *buffer;
14961 /* For some target architectures, but not others, the
14962 read_address function sign-extends the addresses it returns.
14963 To recognize base address selection entries, we need a
14965 unsigned int addr_size = cu->header.addr_size;
14966 CORE_ADDR base_select_mask = ~(~(CORE_ADDR)1 << (addr_size * 8 - 1));
14968 /* The base address, to which the next pair is relative. Note
14969 that this 'base' is a DWARF concept: most entries in a range
14970 list are relative, to reduce the number of relocs against the
14971 debugging information. This is separate from this function's
14972 'baseaddr' argument, which GDB uses to relocate debugging
14973 information from a shared library based on the address at
14974 which the library was loaded. */
14975 CORE_ADDR base = cu->base_address;
14976 int base_known = cu->base_known;
14978 dwarf2_ranges_process (offset, cu,
14979 [&] (CORE_ADDR start, CORE_ADDR end)
14983 start = gdbarch_adjust_dwarf2_addr (gdbarch, start);
14984 end = gdbarch_adjust_dwarf2_addr (gdbarch, end);
14985 record_block_range (block, start, end - 1);
14990 /* Check whether the producer field indicates either of GCC < 4.6, or the
14991 Intel C/C++ compiler, and cache the result in CU. */
14994 check_producer (struct dwarf2_cu *cu)
14998 if (cu->producer == NULL)
15000 /* For unknown compilers expect their behavior is DWARF version
15003 GCC started to support .debug_types sections by -gdwarf-4 since
15004 gcc-4.5.x. As the .debug_types sections are missing DW_AT_producer
15005 for their space efficiency GDB cannot workaround gcc-4.5.x -gdwarf-4
15006 combination. gcc-4.5.x -gdwarf-4 binaries have DW_AT_accessibility
15007 interpreted incorrectly by GDB now - GCC PR debug/48229. */
15009 else if (producer_is_gcc (cu->producer, &major, &minor))
15011 cu->producer_is_gxx_lt_4_6 = major < 4 || (major == 4 && minor < 6);
15012 cu->producer_is_gcc_lt_4_3 = major < 4 || (major == 4 && minor < 3);
15014 else if (producer_is_icc (cu->producer, &major, &minor))
15015 cu->producer_is_icc_lt_14 = major < 14;
15018 /* For other non-GCC compilers, expect their behavior is DWARF version
15022 cu->checked_producer = 1;
15025 /* Check for GCC PR debug/45124 fix which is not present in any G++ version up
15026 to 4.5.any while it is present already in G++ 4.6.0 - the PR has been fixed
15027 during 4.6.0 experimental. */
15030 producer_is_gxx_lt_4_6 (struct dwarf2_cu *cu)
15032 if (!cu->checked_producer)
15033 check_producer (cu);
15035 return cu->producer_is_gxx_lt_4_6;
15038 /* Return the default accessibility type if it is not overriden by
15039 DW_AT_accessibility. */
15041 static enum dwarf_access_attribute
15042 dwarf2_default_access_attribute (struct die_info *die, struct dwarf2_cu *cu)
15044 if (cu->header.version < 3 || producer_is_gxx_lt_4_6 (cu))
15046 /* The default DWARF 2 accessibility for members is public, the default
15047 accessibility for inheritance is private. */
15049 if (die->tag != DW_TAG_inheritance)
15050 return DW_ACCESS_public;
15052 return DW_ACCESS_private;
15056 /* DWARF 3+ defines the default accessibility a different way. The same
15057 rules apply now for DW_TAG_inheritance as for the members and it only
15058 depends on the container kind. */
15060 if (die->parent->tag == DW_TAG_class_type)
15061 return DW_ACCESS_private;
15063 return DW_ACCESS_public;
15067 /* Look for DW_AT_data_member_location. Set *OFFSET to the byte
15068 offset. If the attribute was not found return 0, otherwise return
15069 1. If it was found but could not properly be handled, set *OFFSET
15073 handle_data_member_location (struct die_info *die, struct dwarf2_cu *cu,
15076 struct attribute *attr;
15078 attr = dwarf2_attr (die, DW_AT_data_member_location, cu);
15083 /* Note that we do not check for a section offset first here.
15084 This is because DW_AT_data_member_location is new in DWARF 4,
15085 so if we see it, we can assume that a constant form is really
15086 a constant and not a section offset. */
15087 if (attr_form_is_constant (attr))
15088 *offset = dwarf2_get_attr_constant_value (attr, 0);
15089 else if (attr_form_is_section_offset (attr))
15090 dwarf2_complex_location_expr_complaint ();
15091 else if (attr_form_is_block (attr))
15092 *offset = decode_locdesc (DW_BLOCK (attr), cu);
15094 dwarf2_complex_location_expr_complaint ();
15102 /* Add an aggregate field to the field list. */
15105 dwarf2_add_field (struct field_info *fip, struct die_info *die,
15106 struct dwarf2_cu *cu)
15108 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
15109 struct gdbarch *gdbarch = get_objfile_arch (objfile);
15110 struct nextfield *new_field;
15111 struct attribute *attr;
15113 const char *fieldname = "";
15115 /* Allocate a new field list entry and link it in. */
15116 new_field = XNEW (struct nextfield);
15117 make_cleanup (xfree, new_field);
15118 memset (new_field, 0, sizeof (struct nextfield));
15120 if (die->tag == DW_TAG_inheritance)
15122 new_field->next = fip->baseclasses;
15123 fip->baseclasses = new_field;
15127 new_field->next = fip->fields;
15128 fip->fields = new_field;
15132 attr = dwarf2_attr (die, DW_AT_accessibility, cu);
15134 new_field->accessibility = DW_UNSND (attr);
15136 new_field->accessibility = dwarf2_default_access_attribute (die, cu);
15137 if (new_field->accessibility != DW_ACCESS_public)
15138 fip->non_public_fields = 1;
15140 attr = dwarf2_attr (die, DW_AT_virtuality, cu);
15142 new_field->virtuality = DW_UNSND (attr);
15144 new_field->virtuality = DW_VIRTUALITY_none;
15146 fp = &new_field->field;
15148 if (die->tag == DW_TAG_member && ! die_is_declaration (die, cu))
15152 /* Data member other than a C++ static data member. */
15154 /* Get type of field. */
15155 fp->type = die_type (die, cu);
15157 SET_FIELD_BITPOS (*fp, 0);
15159 /* Get bit size of field (zero if none). */
15160 attr = dwarf2_attr (die, DW_AT_bit_size, cu);
15163 FIELD_BITSIZE (*fp) = DW_UNSND (attr);
15167 FIELD_BITSIZE (*fp) = 0;
15170 /* Get bit offset of field. */
15171 if (handle_data_member_location (die, cu, &offset))
15172 SET_FIELD_BITPOS (*fp, offset * bits_per_byte);
15173 attr = dwarf2_attr (die, DW_AT_bit_offset, cu);
15176 if (gdbarch_bits_big_endian (gdbarch))
15178 /* For big endian bits, the DW_AT_bit_offset gives the
15179 additional bit offset from the MSB of the containing
15180 anonymous object to the MSB of the field. We don't
15181 have to do anything special since we don't need to
15182 know the size of the anonymous object. */
15183 SET_FIELD_BITPOS (*fp, FIELD_BITPOS (*fp) + DW_UNSND (attr));
15187 /* For little endian bits, compute the bit offset to the
15188 MSB of the anonymous object, subtract off the number of
15189 bits from the MSB of the field to the MSB of the
15190 object, and then subtract off the number of bits of
15191 the field itself. The result is the bit offset of
15192 the LSB of the field. */
15193 int anonymous_size;
15194 int bit_offset = DW_UNSND (attr);
15196 attr = dwarf2_attr (die, DW_AT_byte_size, cu);
15199 /* The size of the anonymous object containing
15200 the bit field is explicit, so use the
15201 indicated size (in bytes). */
15202 anonymous_size = DW_UNSND (attr);
15206 /* The size of the anonymous object containing
15207 the bit field must be inferred from the type
15208 attribute of the data member containing the
15210 anonymous_size = TYPE_LENGTH (fp->type);
15212 SET_FIELD_BITPOS (*fp,
15213 (FIELD_BITPOS (*fp)
15214 + anonymous_size * bits_per_byte
15215 - bit_offset - FIELD_BITSIZE (*fp)));
15218 attr = dwarf2_attr (die, DW_AT_data_bit_offset, cu);
15220 SET_FIELD_BITPOS (*fp, (FIELD_BITPOS (*fp)
15221 + dwarf2_get_attr_constant_value (attr, 0)));
15223 /* Get name of field. */
15224 fieldname = dwarf2_name (die, cu);
15225 if (fieldname == NULL)
15228 /* The name is already allocated along with this objfile, so we don't
15229 need to duplicate it for the type. */
15230 fp->name = fieldname;
15232 /* Change accessibility for artificial fields (e.g. virtual table
15233 pointer or virtual base class pointer) to private. */
15234 if (dwarf2_attr (die, DW_AT_artificial, cu))
15236 FIELD_ARTIFICIAL (*fp) = 1;
15237 new_field->accessibility = DW_ACCESS_private;
15238 fip->non_public_fields = 1;
15241 else if (die->tag == DW_TAG_member || die->tag == DW_TAG_variable)
15243 /* C++ static member. */
15245 /* NOTE: carlton/2002-11-05: It should be a DW_TAG_member that
15246 is a declaration, but all versions of G++ as of this writing
15247 (so through at least 3.2.1) incorrectly generate
15248 DW_TAG_variable tags. */
15250 const char *physname;
15252 /* Get name of field. */
15253 fieldname = dwarf2_name (die, cu);
15254 if (fieldname == NULL)
15257 attr = dwarf2_attr (die, DW_AT_const_value, cu);
15259 /* Only create a symbol if this is an external value.
15260 new_symbol checks this and puts the value in the global symbol
15261 table, which we want. If it is not external, new_symbol
15262 will try to put the value in cu->list_in_scope which is wrong. */
15263 && dwarf2_flag_true_p (die, DW_AT_external, cu))
15265 /* A static const member, not much different than an enum as far as
15266 we're concerned, except that we can support more types. */
15267 new_symbol (die, NULL, cu);
15270 /* Get physical name. */
15271 physname = dwarf2_physname (fieldname, die, cu);
15273 /* The name is already allocated along with this objfile, so we don't
15274 need to duplicate it for the type. */
15275 SET_FIELD_PHYSNAME (*fp, physname ? physname : "");
15276 FIELD_TYPE (*fp) = die_type (die, cu);
15277 FIELD_NAME (*fp) = fieldname;
15279 else if (die->tag == DW_TAG_inheritance)
15283 /* C++ base class field. */
15284 if (handle_data_member_location (die, cu, &offset))
15285 SET_FIELD_BITPOS (*fp, offset * bits_per_byte);
15286 FIELD_BITSIZE (*fp) = 0;
15287 FIELD_TYPE (*fp) = die_type (die, cu);
15288 FIELD_NAME (*fp) = type_name_no_tag (fp->type);
15289 fip->nbaseclasses++;
15293 /* Can the type given by DIE define another type? */
15296 type_can_define_types (const struct die_info *die)
15300 case DW_TAG_typedef:
15301 case DW_TAG_class_type:
15302 case DW_TAG_structure_type:
15303 case DW_TAG_union_type:
15304 case DW_TAG_enumeration_type:
15312 /* Add a type definition defined in the scope of the FIP's class. */
15315 dwarf2_add_type_defn (struct field_info *fip, struct die_info *die,
15316 struct dwarf2_cu *cu)
15318 struct decl_field_list *new_field;
15319 struct decl_field *fp;
15321 /* Allocate a new field list entry and link it in. */
15322 new_field = XCNEW (struct decl_field_list);
15323 make_cleanup (xfree, new_field);
15325 gdb_assert (type_can_define_types (die));
15327 fp = &new_field->field;
15329 /* Get name of field. NULL is okay here, meaning an anonymous type. */
15330 fp->name = dwarf2_name (die, cu);
15331 fp->type = read_type_die (die, cu);
15333 /* Save accessibility. */
15334 enum dwarf_access_attribute accessibility;
15335 struct attribute *attr = dwarf2_attr (die, DW_AT_accessibility, cu);
15337 accessibility = (enum dwarf_access_attribute) DW_UNSND (attr);
15339 accessibility = dwarf2_default_access_attribute (die, cu);
15340 switch (accessibility)
15342 case DW_ACCESS_public:
15343 /* The assumed value if neither private nor protected. */
15345 case DW_ACCESS_private:
15346 fp->is_private = 1;
15348 case DW_ACCESS_protected:
15349 fp->is_protected = 1;
15352 complaint (&symfile_complaints,
15353 _("Unhandled DW_AT_accessibility value (%x)"), accessibility);
15356 if (die->tag == DW_TAG_typedef)
15358 new_field->next = fip->typedef_field_list;
15359 fip->typedef_field_list = new_field;
15360 fip->typedef_field_list_count++;
15364 new_field->next = fip->nested_types_list;
15365 fip->nested_types_list = new_field;
15366 fip->nested_types_list_count++;
15370 /* Create the vector of fields, and attach it to the type. */
15373 dwarf2_attach_fields_to_type (struct field_info *fip, struct type *type,
15374 struct dwarf2_cu *cu)
15376 int nfields = fip->nfields;
15378 /* Record the field count, allocate space for the array of fields,
15379 and create blank accessibility bitfields if necessary. */
15380 TYPE_NFIELDS (type) = nfields;
15381 TYPE_FIELDS (type) = (struct field *)
15382 TYPE_ALLOC (type, sizeof (struct field) * nfields);
15383 memset (TYPE_FIELDS (type), 0, sizeof (struct field) * nfields);
15385 if (fip->non_public_fields && cu->language != language_ada)
15387 ALLOCATE_CPLUS_STRUCT_TYPE (type);
15389 TYPE_FIELD_PRIVATE_BITS (type) =
15390 (B_TYPE *) TYPE_ALLOC (type, B_BYTES (nfields));
15391 B_CLRALL (TYPE_FIELD_PRIVATE_BITS (type), nfields);
15393 TYPE_FIELD_PROTECTED_BITS (type) =
15394 (B_TYPE *) TYPE_ALLOC (type, B_BYTES (nfields));
15395 B_CLRALL (TYPE_FIELD_PROTECTED_BITS (type), nfields);
15397 TYPE_FIELD_IGNORE_BITS (type) =
15398 (B_TYPE *) TYPE_ALLOC (type, B_BYTES (nfields));
15399 B_CLRALL (TYPE_FIELD_IGNORE_BITS (type), nfields);
15402 /* If the type has baseclasses, allocate and clear a bit vector for
15403 TYPE_FIELD_VIRTUAL_BITS. */
15404 if (fip->nbaseclasses && cu->language != language_ada)
15406 int num_bytes = B_BYTES (fip->nbaseclasses);
15407 unsigned char *pointer;
15409 ALLOCATE_CPLUS_STRUCT_TYPE (type);
15410 pointer = (unsigned char *) TYPE_ALLOC (type, num_bytes);
15411 TYPE_FIELD_VIRTUAL_BITS (type) = pointer;
15412 B_CLRALL (TYPE_FIELD_VIRTUAL_BITS (type), fip->nbaseclasses);
15413 TYPE_N_BASECLASSES (type) = fip->nbaseclasses;
15416 /* Copy the saved-up fields into the field vector. Start from the head of
15417 the list, adding to the tail of the field array, so that they end up in
15418 the same order in the array in which they were added to the list. */
15419 while (nfields-- > 0)
15421 struct nextfield *fieldp;
15425 fieldp = fip->fields;
15426 fip->fields = fieldp->next;
15430 fieldp = fip->baseclasses;
15431 fip->baseclasses = fieldp->next;
15434 TYPE_FIELD (type, nfields) = fieldp->field;
15435 switch (fieldp->accessibility)
15437 case DW_ACCESS_private:
15438 if (cu->language != language_ada)
15439 SET_TYPE_FIELD_PRIVATE (type, nfields);
15442 case DW_ACCESS_protected:
15443 if (cu->language != language_ada)
15444 SET_TYPE_FIELD_PROTECTED (type, nfields);
15447 case DW_ACCESS_public:
15451 /* Unknown accessibility. Complain and treat it as public. */
15453 complaint (&symfile_complaints, _("unsupported accessibility %d"),
15454 fieldp->accessibility);
15458 if (nfields < fip->nbaseclasses)
15460 switch (fieldp->virtuality)
15462 case DW_VIRTUALITY_virtual:
15463 case DW_VIRTUALITY_pure_virtual:
15464 if (cu->language == language_ada)
15465 error (_("unexpected virtuality in component of Ada type"));
15466 SET_TYPE_FIELD_VIRTUAL (type, nfields);
15473 /* Return true if this member function is a constructor, false
15477 dwarf2_is_constructor (struct die_info *die, struct dwarf2_cu *cu)
15479 const char *fieldname;
15480 const char *type_name;
15483 if (die->parent == NULL)
15486 if (die->parent->tag != DW_TAG_structure_type
15487 && die->parent->tag != DW_TAG_union_type
15488 && die->parent->tag != DW_TAG_class_type)
15491 fieldname = dwarf2_name (die, cu);
15492 type_name = dwarf2_name (die->parent, cu);
15493 if (fieldname == NULL || type_name == NULL)
15496 len = strlen (fieldname);
15497 return (strncmp (fieldname, type_name, len) == 0
15498 && (type_name[len] == '\0' || type_name[len] == '<'));
15501 /* Add a member function to the proper fieldlist. */
15504 dwarf2_add_member_fn (struct field_info *fip, struct die_info *die,
15505 struct type *type, struct dwarf2_cu *cu)
15507 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
15508 struct attribute *attr;
15509 struct fnfieldlist *flp;
15511 struct fn_field *fnp;
15512 const char *fieldname;
15513 struct nextfnfield *new_fnfield;
15514 struct type *this_type;
15515 enum dwarf_access_attribute accessibility;
15517 if (cu->language == language_ada)
15518 error (_("unexpected member function in Ada type"));
15520 /* Get name of member function. */
15521 fieldname = dwarf2_name (die, cu);
15522 if (fieldname == NULL)
15525 /* Look up member function name in fieldlist. */
15526 for (i = 0; i < fip->nfnfields; i++)
15528 if (strcmp (fip->fnfieldlists[i].name, fieldname) == 0)
15532 /* Create new list element if necessary. */
15533 if (i < fip->nfnfields)
15534 flp = &fip->fnfieldlists[i];
15537 if ((fip->nfnfields % DW_FIELD_ALLOC_CHUNK) == 0)
15539 fip->fnfieldlists = (struct fnfieldlist *)
15540 xrealloc (fip->fnfieldlists,
15541 (fip->nfnfields + DW_FIELD_ALLOC_CHUNK)
15542 * sizeof (struct fnfieldlist));
15543 if (fip->nfnfields == 0)
15544 make_cleanup (free_current_contents, &fip->fnfieldlists);
15546 flp = &fip->fnfieldlists[fip->nfnfields];
15547 flp->name = fieldname;
15550 i = fip->nfnfields++;
15553 /* Create a new member function field and chain it to the field list
15555 new_fnfield = XNEW (struct nextfnfield);
15556 make_cleanup (xfree, new_fnfield);
15557 memset (new_fnfield, 0, sizeof (struct nextfnfield));
15558 new_fnfield->next = flp->head;
15559 flp->head = new_fnfield;
15562 /* Fill in the member function field info. */
15563 fnp = &new_fnfield->fnfield;
15565 /* Delay processing of the physname until later. */
15566 if (cu->language == language_cplus)
15568 add_to_method_list (type, i, flp->length - 1, fieldname,
15573 const char *physname = dwarf2_physname (fieldname, die, cu);
15574 fnp->physname = physname ? physname : "";
15577 fnp->type = alloc_type (objfile);
15578 this_type = read_type_die (die, cu);
15579 if (this_type && TYPE_CODE (this_type) == TYPE_CODE_FUNC)
15581 int nparams = TYPE_NFIELDS (this_type);
15583 /* TYPE is the domain of this method, and THIS_TYPE is the type
15584 of the method itself (TYPE_CODE_METHOD). */
15585 smash_to_method_type (fnp->type, type,
15586 TYPE_TARGET_TYPE (this_type),
15587 TYPE_FIELDS (this_type),
15588 TYPE_NFIELDS (this_type),
15589 TYPE_VARARGS (this_type));
15591 /* Handle static member functions.
15592 Dwarf2 has no clean way to discern C++ static and non-static
15593 member functions. G++ helps GDB by marking the first
15594 parameter for non-static member functions (which is the this
15595 pointer) as artificial. We obtain this information from
15596 read_subroutine_type via TYPE_FIELD_ARTIFICIAL. */
15597 if (nparams == 0 || TYPE_FIELD_ARTIFICIAL (this_type, 0) == 0)
15598 fnp->voffset = VOFFSET_STATIC;
15601 complaint (&symfile_complaints, _("member function type missing for '%s'"),
15602 dwarf2_full_name (fieldname, die, cu));
15604 /* Get fcontext from DW_AT_containing_type if present. */
15605 if (dwarf2_attr (die, DW_AT_containing_type, cu) != NULL)
15606 fnp->fcontext = die_containing_type (die, cu);
15608 /* dwarf2 doesn't have stubbed physical names, so the setting of is_const and
15609 is_volatile is irrelevant, as it is needed by gdb_mangle_name only. */
15611 /* Get accessibility. */
15612 attr = dwarf2_attr (die, DW_AT_accessibility, cu);
15614 accessibility = (enum dwarf_access_attribute) DW_UNSND (attr);
15616 accessibility = dwarf2_default_access_attribute (die, cu);
15617 switch (accessibility)
15619 case DW_ACCESS_private:
15620 fnp->is_private = 1;
15622 case DW_ACCESS_protected:
15623 fnp->is_protected = 1;
15627 /* Check for artificial methods. */
15628 attr = dwarf2_attr (die, DW_AT_artificial, cu);
15629 if (attr && DW_UNSND (attr) != 0)
15630 fnp->is_artificial = 1;
15632 fnp->is_constructor = dwarf2_is_constructor (die, cu);
15634 /* Get index in virtual function table if it is a virtual member
15635 function. For older versions of GCC, this is an offset in the
15636 appropriate virtual table, as specified by DW_AT_containing_type.
15637 For everyone else, it is an expression to be evaluated relative
15638 to the object address. */
15640 attr = dwarf2_attr (die, DW_AT_vtable_elem_location, cu);
15643 if (attr_form_is_block (attr) && DW_BLOCK (attr)->size > 0)
15645 if (DW_BLOCK (attr)->data[0] == DW_OP_constu)
15647 /* Old-style GCC. */
15648 fnp->voffset = decode_locdesc (DW_BLOCK (attr), cu) + 2;
15650 else if (DW_BLOCK (attr)->data[0] == DW_OP_deref
15651 || (DW_BLOCK (attr)->size > 1
15652 && DW_BLOCK (attr)->data[0] == DW_OP_deref_size
15653 && DW_BLOCK (attr)->data[1] == cu->header.addr_size))
15655 fnp->voffset = decode_locdesc (DW_BLOCK (attr), cu);
15656 if ((fnp->voffset % cu->header.addr_size) != 0)
15657 dwarf2_complex_location_expr_complaint ();
15659 fnp->voffset /= cu->header.addr_size;
15663 dwarf2_complex_location_expr_complaint ();
15665 if (!fnp->fcontext)
15667 /* If there is no `this' field and no DW_AT_containing_type,
15668 we cannot actually find a base class context for the
15670 if (TYPE_NFIELDS (this_type) == 0
15671 || !TYPE_FIELD_ARTIFICIAL (this_type, 0))
15673 complaint (&symfile_complaints,
15674 _("cannot determine context for virtual member "
15675 "function \"%s\" (offset %d)"),
15676 fieldname, to_underlying (die->sect_off));
15681 = TYPE_TARGET_TYPE (TYPE_FIELD_TYPE (this_type, 0));
15685 else if (attr_form_is_section_offset (attr))
15687 dwarf2_complex_location_expr_complaint ();
15691 dwarf2_invalid_attrib_class_complaint ("DW_AT_vtable_elem_location",
15697 attr = dwarf2_attr (die, DW_AT_virtuality, cu);
15698 if (attr && DW_UNSND (attr))
15700 /* GCC does this, as of 2008-08-25; PR debug/37237. */
15701 complaint (&symfile_complaints,
15702 _("Member function \"%s\" (offset %d) is virtual "
15703 "but the vtable offset is not specified"),
15704 fieldname, to_underlying (die->sect_off));
15705 ALLOCATE_CPLUS_STRUCT_TYPE (type);
15706 TYPE_CPLUS_DYNAMIC (type) = 1;
15711 /* Create the vector of member function fields, and attach it to the type. */
15714 dwarf2_attach_fn_fields_to_type (struct field_info *fip, struct type *type,
15715 struct dwarf2_cu *cu)
15717 struct fnfieldlist *flp;
15720 if (cu->language == language_ada)
15721 error (_("unexpected member functions in Ada type"));
15723 ALLOCATE_CPLUS_STRUCT_TYPE (type);
15724 TYPE_FN_FIELDLISTS (type) = (struct fn_fieldlist *)
15725 TYPE_ALLOC (type, sizeof (struct fn_fieldlist) * fip->nfnfields);
15727 for (i = 0, flp = fip->fnfieldlists; i < fip->nfnfields; i++, flp++)
15729 struct nextfnfield *nfp = flp->head;
15730 struct fn_fieldlist *fn_flp = &TYPE_FN_FIELDLIST (type, i);
15733 TYPE_FN_FIELDLIST_NAME (type, i) = flp->name;
15734 TYPE_FN_FIELDLIST_LENGTH (type, i) = flp->length;
15735 fn_flp->fn_fields = (struct fn_field *)
15736 TYPE_ALLOC (type, sizeof (struct fn_field) * flp->length);
15737 for (k = flp->length; (k--, nfp); nfp = nfp->next)
15738 fn_flp->fn_fields[k] = nfp->fnfield;
15741 TYPE_NFN_FIELDS (type) = fip->nfnfields;
15744 /* Returns non-zero if NAME is the name of a vtable member in CU's
15745 language, zero otherwise. */
15747 is_vtable_name (const char *name, struct dwarf2_cu *cu)
15749 static const char vptr[] = "_vptr";
15751 /* Look for the C++ form of the vtable. */
15752 if (startswith (name, vptr) && is_cplus_marker (name[sizeof (vptr) - 1]))
15758 /* GCC outputs unnamed structures that are really pointers to member
15759 functions, with the ABI-specified layout. If TYPE describes
15760 such a structure, smash it into a member function type.
15762 GCC shouldn't do this; it should just output pointer to member DIEs.
15763 This is GCC PR debug/28767. */
15766 quirk_gcc_member_function_pointer (struct type *type, struct objfile *objfile)
15768 struct type *pfn_type, *self_type, *new_type;
15770 /* Check for a structure with no name and two children. */
15771 if (TYPE_CODE (type) != TYPE_CODE_STRUCT || TYPE_NFIELDS (type) != 2)
15774 /* Check for __pfn and __delta members. */
15775 if (TYPE_FIELD_NAME (type, 0) == NULL
15776 || strcmp (TYPE_FIELD_NAME (type, 0), "__pfn") != 0
15777 || TYPE_FIELD_NAME (type, 1) == NULL
15778 || strcmp (TYPE_FIELD_NAME (type, 1), "__delta") != 0)
15781 /* Find the type of the method. */
15782 pfn_type = TYPE_FIELD_TYPE (type, 0);
15783 if (pfn_type == NULL
15784 || TYPE_CODE (pfn_type) != TYPE_CODE_PTR
15785 || TYPE_CODE (TYPE_TARGET_TYPE (pfn_type)) != TYPE_CODE_FUNC)
15788 /* Look for the "this" argument. */
15789 pfn_type = TYPE_TARGET_TYPE (pfn_type);
15790 if (TYPE_NFIELDS (pfn_type) == 0
15791 /* || TYPE_FIELD_TYPE (pfn_type, 0) == NULL */
15792 || TYPE_CODE (TYPE_FIELD_TYPE (pfn_type, 0)) != TYPE_CODE_PTR)
15795 self_type = TYPE_TARGET_TYPE (TYPE_FIELD_TYPE (pfn_type, 0));
15796 new_type = alloc_type (objfile);
15797 smash_to_method_type (new_type, self_type, TYPE_TARGET_TYPE (pfn_type),
15798 TYPE_FIELDS (pfn_type), TYPE_NFIELDS (pfn_type),
15799 TYPE_VARARGS (pfn_type));
15800 smash_to_methodptr_type (type, new_type);
15804 /* Called when we find the DIE that starts a structure or union scope
15805 (definition) to create a type for the structure or union. Fill in
15806 the type's name and general properties; the members will not be
15807 processed until process_structure_scope. A symbol table entry for
15808 the type will also not be done until process_structure_scope (assuming
15809 the type has a name).
15811 NOTE: we need to call these functions regardless of whether or not the
15812 DIE has a DW_AT_name attribute, since it might be an anonymous
15813 structure or union. This gets the type entered into our set of
15814 user defined types. */
15816 static struct type *
15817 read_structure_type (struct die_info *die, struct dwarf2_cu *cu)
15819 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
15821 struct attribute *attr;
15824 /* If the definition of this type lives in .debug_types, read that type.
15825 Don't follow DW_AT_specification though, that will take us back up
15826 the chain and we want to go down. */
15827 attr = dwarf2_attr_no_follow (die, DW_AT_signature);
15830 type = get_DW_AT_signature_type (die, attr, cu);
15832 /* The type's CU may not be the same as CU.
15833 Ensure TYPE is recorded with CU in die_type_hash. */
15834 return set_die_type (die, type, cu);
15837 type = alloc_type (objfile);
15838 INIT_CPLUS_SPECIFIC (type);
15840 name = dwarf2_name (die, cu);
15843 if (cu->language == language_cplus
15844 || cu->language == language_d
15845 || cu->language == language_rust)
15847 const char *full_name = dwarf2_full_name (name, die, cu);
15849 /* dwarf2_full_name might have already finished building the DIE's
15850 type. If so, there is no need to continue. */
15851 if (get_die_type (die, cu) != NULL)
15852 return get_die_type (die, cu);
15854 TYPE_TAG_NAME (type) = full_name;
15855 if (die->tag == DW_TAG_structure_type
15856 || die->tag == DW_TAG_class_type)
15857 TYPE_NAME (type) = TYPE_TAG_NAME (type);
15861 /* The name is already allocated along with this objfile, so
15862 we don't need to duplicate it for the type. */
15863 TYPE_TAG_NAME (type) = name;
15864 if (die->tag == DW_TAG_class_type)
15865 TYPE_NAME (type) = TYPE_TAG_NAME (type);
15869 if (die->tag == DW_TAG_structure_type)
15871 TYPE_CODE (type) = TYPE_CODE_STRUCT;
15873 else if (die->tag == DW_TAG_union_type)
15875 TYPE_CODE (type) = TYPE_CODE_UNION;
15879 TYPE_CODE (type) = TYPE_CODE_STRUCT;
15882 if (cu->language == language_cplus && die->tag == DW_TAG_class_type)
15883 TYPE_DECLARED_CLASS (type) = 1;
15885 attr = dwarf2_attr (die, DW_AT_byte_size, cu);
15888 if (attr_form_is_constant (attr))
15889 TYPE_LENGTH (type) = DW_UNSND (attr);
15892 /* For the moment, dynamic type sizes are not supported
15893 by GDB's struct type. The actual size is determined
15894 on-demand when resolving the type of a given object,
15895 so set the type's length to zero for now. Otherwise,
15896 we record an expression as the length, and that expression
15897 could lead to a very large value, which could eventually
15898 lead to us trying to allocate that much memory when creating
15899 a value of that type. */
15900 TYPE_LENGTH (type) = 0;
15905 TYPE_LENGTH (type) = 0;
15908 if (producer_is_icc_lt_14 (cu) && (TYPE_LENGTH (type) == 0))
15910 /* ICC<14 does not output the required DW_AT_declaration on
15911 incomplete types, but gives them a size of zero. */
15912 TYPE_STUB (type) = 1;
15915 TYPE_STUB_SUPPORTED (type) = 1;
15917 if (die_is_declaration (die, cu))
15918 TYPE_STUB (type) = 1;
15919 else if (attr == NULL && die->child == NULL
15920 && producer_is_realview (cu->producer))
15921 /* RealView does not output the required DW_AT_declaration
15922 on incomplete types. */
15923 TYPE_STUB (type) = 1;
15925 /* We need to add the type field to the die immediately so we don't
15926 infinitely recurse when dealing with pointers to the structure
15927 type within the structure itself. */
15928 set_die_type (die, type, cu);
15930 /* set_die_type should be already done. */
15931 set_descriptive_type (type, die, cu);
15936 /* Finish creating a structure or union type, including filling in
15937 its members and creating a symbol for it. */
15940 process_structure_scope (struct die_info *die, struct dwarf2_cu *cu)
15942 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
15943 struct die_info *child_die;
15946 type = get_die_type (die, cu);
15948 type = read_structure_type (die, cu);
15950 if (die->child != NULL && ! die_is_declaration (die, cu))
15952 struct field_info fi;
15953 std::vector<struct symbol *> template_args;
15954 struct cleanup *back_to = make_cleanup (null_cleanup, 0);
15956 memset (&fi, 0, sizeof (struct field_info));
15958 child_die = die->child;
15960 while (child_die && child_die->tag)
15962 if (child_die->tag == DW_TAG_member
15963 || child_die->tag == DW_TAG_variable)
15965 /* NOTE: carlton/2002-11-05: A C++ static data member
15966 should be a DW_TAG_member that is a declaration, but
15967 all versions of G++ as of this writing (so through at
15968 least 3.2.1) incorrectly generate DW_TAG_variable
15969 tags for them instead. */
15970 dwarf2_add_field (&fi, child_die, cu);
15972 else if (child_die->tag == DW_TAG_subprogram)
15974 /* Rust doesn't have member functions in the C++ sense.
15975 However, it does emit ordinary functions as children
15976 of a struct DIE. */
15977 if (cu->language == language_rust)
15978 read_func_scope (child_die, cu);
15981 /* C++ member function. */
15982 dwarf2_add_member_fn (&fi, child_die, type, cu);
15985 else if (child_die->tag == DW_TAG_inheritance)
15987 /* C++ base class field. */
15988 dwarf2_add_field (&fi, child_die, cu);
15990 else if (type_can_define_types (child_die))
15991 dwarf2_add_type_defn (&fi, child_die, cu);
15992 else if (child_die->tag == DW_TAG_template_type_param
15993 || child_die->tag == DW_TAG_template_value_param)
15995 struct symbol *arg = new_symbol (child_die, NULL, cu);
15998 template_args.push_back (arg);
16001 child_die = sibling_die (child_die);
16004 /* Attach template arguments to type. */
16005 if (!template_args.empty ())
16007 ALLOCATE_CPLUS_STRUCT_TYPE (type);
16008 TYPE_N_TEMPLATE_ARGUMENTS (type) = template_args.size ();
16009 TYPE_TEMPLATE_ARGUMENTS (type)
16010 = XOBNEWVEC (&objfile->objfile_obstack,
16012 TYPE_N_TEMPLATE_ARGUMENTS (type));
16013 memcpy (TYPE_TEMPLATE_ARGUMENTS (type),
16014 template_args.data (),
16015 (TYPE_N_TEMPLATE_ARGUMENTS (type)
16016 * sizeof (struct symbol *)));
16019 /* Attach fields and member functions to the type. */
16021 dwarf2_attach_fields_to_type (&fi, type, cu);
16024 dwarf2_attach_fn_fields_to_type (&fi, type, cu);
16026 /* Get the type which refers to the base class (possibly this
16027 class itself) which contains the vtable pointer for the current
16028 class from the DW_AT_containing_type attribute. This use of
16029 DW_AT_containing_type is a GNU extension. */
16031 if (dwarf2_attr (die, DW_AT_containing_type, cu) != NULL)
16033 struct type *t = die_containing_type (die, cu);
16035 set_type_vptr_basetype (type, t);
16040 /* Our own class provides vtbl ptr. */
16041 for (i = TYPE_NFIELDS (t) - 1;
16042 i >= TYPE_N_BASECLASSES (t);
16045 const char *fieldname = TYPE_FIELD_NAME (t, i);
16047 if (is_vtable_name (fieldname, cu))
16049 set_type_vptr_fieldno (type, i);
16054 /* Complain if virtual function table field not found. */
16055 if (i < TYPE_N_BASECLASSES (t))
16056 complaint (&symfile_complaints,
16057 _("virtual function table pointer "
16058 "not found when defining class '%s'"),
16059 TYPE_TAG_NAME (type) ? TYPE_TAG_NAME (type) :
16064 set_type_vptr_fieldno (type, TYPE_VPTR_FIELDNO (t));
16067 else if (cu->producer
16068 && startswith (cu->producer, "IBM(R) XL C/C++ Advanced Edition"))
16070 /* The IBM XLC compiler does not provide direct indication
16071 of the containing type, but the vtable pointer is
16072 always named __vfp. */
16076 for (i = TYPE_NFIELDS (type) - 1;
16077 i >= TYPE_N_BASECLASSES (type);
16080 if (strcmp (TYPE_FIELD_NAME (type, i), "__vfp") == 0)
16082 set_type_vptr_fieldno (type, i);
16083 set_type_vptr_basetype (type, type);
16090 /* Copy fi.typedef_field_list linked list elements content into the
16091 allocated array TYPE_TYPEDEF_FIELD_ARRAY (type). */
16092 if (fi.typedef_field_list)
16094 int i = fi.typedef_field_list_count;
16096 ALLOCATE_CPLUS_STRUCT_TYPE (type);
16097 TYPE_TYPEDEF_FIELD_ARRAY (type)
16098 = ((struct decl_field *)
16099 TYPE_ALLOC (type, sizeof (TYPE_TYPEDEF_FIELD (type, 0)) * i));
16100 TYPE_TYPEDEF_FIELD_COUNT (type) = i;
16102 /* Reverse the list order to keep the debug info elements order. */
16105 struct decl_field *dest, *src;
16107 dest = &TYPE_TYPEDEF_FIELD (type, i);
16108 src = &fi.typedef_field_list->field;
16109 fi.typedef_field_list = fi.typedef_field_list->next;
16114 /* Copy fi.nested_types_list linked list elements content into the
16115 allocated array TYPE_NESTED_TYPES_ARRAY (type). */
16116 if (fi.nested_types_list != NULL && cu->language != language_ada)
16118 int i = fi.nested_types_list_count;
16120 ALLOCATE_CPLUS_STRUCT_TYPE (type);
16121 TYPE_NESTED_TYPES_ARRAY (type)
16122 = ((struct decl_field *)
16123 TYPE_ALLOC (type, sizeof (struct decl_field) * i));
16124 TYPE_NESTED_TYPES_COUNT (type) = i;
16126 /* Reverse the list order to keep the debug info elements order. */
16129 struct decl_field *dest, *src;
16131 dest = &TYPE_NESTED_TYPES_FIELD (type, i);
16132 src = &fi.nested_types_list->field;
16133 fi.nested_types_list = fi.nested_types_list->next;
16138 do_cleanups (back_to);
16141 quirk_gcc_member_function_pointer (type, objfile);
16143 /* NOTE: carlton/2004-03-16: GCC 3.4 (or at least one of its
16144 snapshots) has been known to create a die giving a declaration
16145 for a class that has, as a child, a die giving a definition for a
16146 nested class. So we have to process our children even if the
16147 current die is a declaration. Normally, of course, a declaration
16148 won't have any children at all. */
16150 child_die = die->child;
16152 while (child_die != NULL && child_die->tag)
16154 if (child_die->tag == DW_TAG_member
16155 || child_die->tag == DW_TAG_variable
16156 || child_die->tag == DW_TAG_inheritance
16157 || child_die->tag == DW_TAG_template_value_param
16158 || child_die->tag == DW_TAG_template_type_param)
16163 process_die (child_die, cu);
16165 child_die = sibling_die (child_die);
16168 /* Do not consider external references. According to the DWARF standard,
16169 these DIEs are identified by the fact that they have no byte_size
16170 attribute, and a declaration attribute. */
16171 if (dwarf2_attr (die, DW_AT_byte_size, cu) != NULL
16172 || !die_is_declaration (die, cu))
16173 new_symbol (die, type, cu);
16176 /* Assuming DIE is an enumeration type, and TYPE is its associated type,
16177 update TYPE using some information only available in DIE's children. */
16180 update_enumeration_type_from_children (struct die_info *die,
16182 struct dwarf2_cu *cu)
16184 struct die_info *child_die;
16185 int unsigned_enum = 1;
16189 auto_obstack obstack;
16191 for (child_die = die->child;
16192 child_die != NULL && child_die->tag;
16193 child_die = sibling_die (child_die))
16195 struct attribute *attr;
16197 const gdb_byte *bytes;
16198 struct dwarf2_locexpr_baton *baton;
16201 if (child_die->tag != DW_TAG_enumerator)
16204 attr = dwarf2_attr (child_die, DW_AT_const_value, cu);
16208 name = dwarf2_name (child_die, cu);
16210 name = "<anonymous enumerator>";
16212 dwarf2_const_value_attr (attr, type, name, &obstack, cu,
16213 &value, &bytes, &baton);
16219 else if ((mask & value) != 0)
16224 /* If we already know that the enum type is neither unsigned, nor
16225 a flag type, no need to look at the rest of the enumerates. */
16226 if (!unsigned_enum && !flag_enum)
16231 TYPE_UNSIGNED (type) = 1;
16233 TYPE_FLAG_ENUM (type) = 1;
16236 /* Given a DW_AT_enumeration_type die, set its type. We do not
16237 complete the type's fields yet, or create any symbols. */
16239 static struct type *
16240 read_enumeration_type (struct die_info *die, struct dwarf2_cu *cu)
16242 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
16244 struct attribute *attr;
16247 /* If the definition of this type lives in .debug_types, read that type.
16248 Don't follow DW_AT_specification though, that will take us back up
16249 the chain and we want to go down. */
16250 attr = dwarf2_attr_no_follow (die, DW_AT_signature);
16253 type = get_DW_AT_signature_type (die, attr, cu);
16255 /* The type's CU may not be the same as CU.
16256 Ensure TYPE is recorded with CU in die_type_hash. */
16257 return set_die_type (die, type, cu);
16260 type = alloc_type (objfile);
16262 TYPE_CODE (type) = TYPE_CODE_ENUM;
16263 name = dwarf2_full_name (NULL, die, cu);
16265 TYPE_TAG_NAME (type) = name;
16267 attr = dwarf2_attr (die, DW_AT_type, cu);
16270 struct type *underlying_type = die_type (die, cu);
16272 TYPE_TARGET_TYPE (type) = underlying_type;
16275 attr = dwarf2_attr (die, DW_AT_byte_size, cu);
16278 TYPE_LENGTH (type) = DW_UNSND (attr);
16282 TYPE_LENGTH (type) = 0;
16285 /* The enumeration DIE can be incomplete. In Ada, any type can be
16286 declared as private in the package spec, and then defined only
16287 inside the package body. Such types are known as Taft Amendment
16288 Types. When another package uses such a type, an incomplete DIE
16289 may be generated by the compiler. */
16290 if (die_is_declaration (die, cu))
16291 TYPE_STUB (type) = 1;
16293 /* Finish the creation of this type by using the enum's children.
16294 We must call this even when the underlying type has been provided
16295 so that we can determine if we're looking at a "flag" enum. */
16296 update_enumeration_type_from_children (die, type, cu);
16298 /* If this type has an underlying type that is not a stub, then we
16299 may use its attributes. We always use the "unsigned" attribute
16300 in this situation, because ordinarily we guess whether the type
16301 is unsigned -- but the guess can be wrong and the underlying type
16302 can tell us the reality. However, we defer to a local size
16303 attribute if one exists, because this lets the compiler override
16304 the underlying type if needed. */
16305 if (TYPE_TARGET_TYPE (type) != NULL && !TYPE_STUB (TYPE_TARGET_TYPE (type)))
16307 TYPE_UNSIGNED (type) = TYPE_UNSIGNED (TYPE_TARGET_TYPE (type));
16308 if (TYPE_LENGTH (type) == 0)
16309 TYPE_LENGTH (type) = TYPE_LENGTH (TYPE_TARGET_TYPE (type));
16312 TYPE_DECLARED_CLASS (type) = dwarf2_flag_true_p (die, DW_AT_enum_class, cu);
16314 return set_die_type (die, type, cu);
16317 /* Given a pointer to a die which begins an enumeration, process all
16318 the dies that define the members of the enumeration, and create the
16319 symbol for the enumeration type.
16321 NOTE: We reverse the order of the element list. */
16324 process_enumeration_scope (struct die_info *die, struct dwarf2_cu *cu)
16326 struct type *this_type;
16328 this_type = get_die_type (die, cu);
16329 if (this_type == NULL)
16330 this_type = read_enumeration_type (die, cu);
16332 if (die->child != NULL)
16334 struct die_info *child_die;
16335 struct symbol *sym;
16336 struct field *fields = NULL;
16337 int num_fields = 0;
16340 child_die = die->child;
16341 while (child_die && child_die->tag)
16343 if (child_die->tag != DW_TAG_enumerator)
16345 process_die (child_die, cu);
16349 name = dwarf2_name (child_die, cu);
16352 sym = new_symbol (child_die, this_type, cu);
16354 if ((num_fields % DW_FIELD_ALLOC_CHUNK) == 0)
16356 fields = (struct field *)
16358 (num_fields + DW_FIELD_ALLOC_CHUNK)
16359 * sizeof (struct field));
16362 FIELD_NAME (fields[num_fields]) = SYMBOL_LINKAGE_NAME (sym);
16363 FIELD_TYPE (fields[num_fields]) = NULL;
16364 SET_FIELD_ENUMVAL (fields[num_fields], SYMBOL_VALUE (sym));
16365 FIELD_BITSIZE (fields[num_fields]) = 0;
16371 child_die = sibling_die (child_die);
16376 TYPE_NFIELDS (this_type) = num_fields;
16377 TYPE_FIELDS (this_type) = (struct field *)
16378 TYPE_ALLOC (this_type, sizeof (struct field) * num_fields);
16379 memcpy (TYPE_FIELDS (this_type), fields,
16380 sizeof (struct field) * num_fields);
16385 /* If we are reading an enum from a .debug_types unit, and the enum
16386 is a declaration, and the enum is not the signatured type in the
16387 unit, then we do not want to add a symbol for it. Adding a
16388 symbol would in some cases obscure the true definition of the
16389 enum, giving users an incomplete type when the definition is
16390 actually available. Note that we do not want to do this for all
16391 enums which are just declarations, because C++0x allows forward
16392 enum declarations. */
16393 if (cu->per_cu->is_debug_types
16394 && die_is_declaration (die, cu))
16396 struct signatured_type *sig_type;
16398 sig_type = (struct signatured_type *) cu->per_cu;
16399 gdb_assert (to_underlying (sig_type->type_offset_in_section) != 0);
16400 if (sig_type->type_offset_in_section != die->sect_off)
16404 new_symbol (die, this_type, cu);
16407 /* Extract all information from a DW_TAG_array_type DIE and put it in
16408 the DIE's type field. For now, this only handles one dimensional
16411 static struct type *
16412 read_array_type (struct die_info *die, struct dwarf2_cu *cu)
16414 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
16415 struct die_info *child_die;
16417 struct type *element_type, *range_type, *index_type;
16418 struct attribute *attr;
16420 struct dynamic_prop *byte_stride_prop = NULL;
16421 unsigned int bit_stride = 0;
16423 element_type = die_type (die, cu);
16425 /* The die_type call above may have already set the type for this DIE. */
16426 type = get_die_type (die, cu);
16430 attr = dwarf2_attr (die, DW_AT_byte_stride, cu);
16436 = (struct dynamic_prop *) alloca (sizeof (struct dynamic_prop));
16437 stride_ok = attr_to_dynamic_prop (attr, die, cu, byte_stride_prop);
16440 complaint (&symfile_complaints,
16441 _("unable to read array DW_AT_byte_stride "
16442 " - DIE at 0x%x [in module %s]"),
16443 to_underlying (die->sect_off),
16444 objfile_name (cu->per_cu->dwarf2_per_objfile->objfile));
16445 /* Ignore this attribute. We will likely not be able to print
16446 arrays of this type correctly, but there is little we can do
16447 to help if we cannot read the attribute's value. */
16448 byte_stride_prop = NULL;
16452 attr = dwarf2_attr (die, DW_AT_bit_stride, cu);
16454 bit_stride = DW_UNSND (attr);
16456 /* Irix 6.2 native cc creates array types without children for
16457 arrays with unspecified length. */
16458 if (die->child == NULL)
16460 index_type = objfile_type (objfile)->builtin_int;
16461 range_type = create_static_range_type (NULL, index_type, 0, -1);
16462 type = create_array_type_with_stride (NULL, element_type, range_type,
16463 byte_stride_prop, bit_stride);
16464 return set_die_type (die, type, cu);
16467 std::vector<struct type *> range_types;
16468 child_die = die->child;
16469 while (child_die && child_die->tag)
16471 if (child_die->tag == DW_TAG_subrange_type)
16473 struct type *child_type = read_type_die (child_die, cu);
16475 if (child_type != NULL)
16477 /* The range type was succesfully read. Save it for the
16478 array type creation. */
16479 range_types.push_back (child_type);
16482 child_die = sibling_die (child_die);
16485 /* Dwarf2 dimensions are output from left to right, create the
16486 necessary array types in backwards order. */
16488 type = element_type;
16490 if (read_array_order (die, cu) == DW_ORD_col_major)
16494 while (i < range_types.size ())
16495 type = create_array_type_with_stride (NULL, type, range_types[i++],
16496 byte_stride_prop, bit_stride);
16500 size_t ndim = range_types.size ();
16502 type = create_array_type_with_stride (NULL, type, range_types[ndim],
16503 byte_stride_prop, bit_stride);
16506 /* Understand Dwarf2 support for vector types (like they occur on
16507 the PowerPC w/ AltiVec). Gcc just adds another attribute to the
16508 array type. This is not part of the Dwarf2/3 standard yet, but a
16509 custom vendor extension. The main difference between a regular
16510 array and the vector variant is that vectors are passed by value
16512 attr = dwarf2_attr (die, DW_AT_GNU_vector, cu);
16514 make_vector_type (type);
16516 /* The DIE may have DW_AT_byte_size set. For example an OpenCL
16517 implementation may choose to implement triple vectors using this
16519 attr = dwarf2_attr (die, DW_AT_byte_size, cu);
16522 if (DW_UNSND (attr) >= TYPE_LENGTH (type))
16523 TYPE_LENGTH (type) = DW_UNSND (attr);
16525 complaint (&symfile_complaints,
16526 _("DW_AT_byte_size for array type smaller "
16527 "than the total size of elements"));
16530 name = dwarf2_name (die, cu);
16532 TYPE_NAME (type) = name;
16534 /* Install the type in the die. */
16535 set_die_type (die, type, cu);
16537 /* set_die_type should be already done. */
16538 set_descriptive_type (type, die, cu);
16543 static enum dwarf_array_dim_ordering
16544 read_array_order (struct die_info *die, struct dwarf2_cu *cu)
16546 struct attribute *attr;
16548 attr = dwarf2_attr (die, DW_AT_ordering, cu);
16551 return (enum dwarf_array_dim_ordering) DW_SND (attr);
16553 /* GNU F77 is a special case, as at 08/2004 array type info is the
16554 opposite order to the dwarf2 specification, but data is still
16555 laid out as per normal fortran.
16557 FIXME: dsl/2004-8-20: If G77 is ever fixed, this will also need
16558 version checking. */
16560 if (cu->language == language_fortran
16561 && cu->producer && strstr (cu->producer, "GNU F77"))
16563 return DW_ORD_row_major;
16566 switch (cu->language_defn->la_array_ordering)
16568 case array_column_major:
16569 return DW_ORD_col_major;
16570 case array_row_major:
16572 return DW_ORD_row_major;
16576 /* Extract all information from a DW_TAG_set_type DIE and put it in
16577 the DIE's type field. */
16579 static struct type *
16580 read_set_type (struct die_info *die, struct dwarf2_cu *cu)
16582 struct type *domain_type, *set_type;
16583 struct attribute *attr;
16585 domain_type = die_type (die, cu);
16587 /* The die_type call above may have already set the type for this DIE. */
16588 set_type = get_die_type (die, cu);
16592 set_type = create_set_type (NULL, domain_type);
16594 attr = dwarf2_attr (die, DW_AT_byte_size, cu);
16596 TYPE_LENGTH (set_type) = DW_UNSND (attr);
16598 return set_die_type (die, set_type, cu);
16601 /* A helper for read_common_block that creates a locexpr baton.
16602 SYM is the symbol which we are marking as computed.
16603 COMMON_DIE is the DIE for the common block.
16604 COMMON_LOC is the location expression attribute for the common
16606 MEMBER_LOC is the location expression attribute for the particular
16607 member of the common block that we are processing.
16608 CU is the CU from which the above come. */
16611 mark_common_block_symbol_computed (struct symbol *sym,
16612 struct die_info *common_die,
16613 struct attribute *common_loc,
16614 struct attribute *member_loc,
16615 struct dwarf2_cu *cu)
16617 struct dwarf2_per_objfile *dwarf2_per_objfile
16618 = cu->per_cu->dwarf2_per_objfile;
16619 struct objfile *objfile = dwarf2_per_objfile->objfile;
16620 struct dwarf2_locexpr_baton *baton;
16622 unsigned int cu_off;
16623 enum bfd_endian byte_order = gdbarch_byte_order (get_objfile_arch (objfile));
16624 LONGEST offset = 0;
16626 gdb_assert (common_loc && member_loc);
16627 gdb_assert (attr_form_is_block (common_loc));
16628 gdb_assert (attr_form_is_block (member_loc)
16629 || attr_form_is_constant (member_loc));
16631 baton = XOBNEW (&objfile->objfile_obstack, struct dwarf2_locexpr_baton);
16632 baton->per_cu = cu->per_cu;
16633 gdb_assert (baton->per_cu);
16635 baton->size = 5 /* DW_OP_call4 */ + 1 /* DW_OP_plus */;
16637 if (attr_form_is_constant (member_loc))
16639 offset = dwarf2_get_attr_constant_value (member_loc, 0);
16640 baton->size += 1 /* DW_OP_addr */ + cu->header.addr_size;
16643 baton->size += DW_BLOCK (member_loc)->size;
16645 ptr = (gdb_byte *) obstack_alloc (&objfile->objfile_obstack, baton->size);
16648 *ptr++ = DW_OP_call4;
16649 cu_off = common_die->sect_off - cu->per_cu->sect_off;
16650 store_unsigned_integer (ptr, 4, byte_order, cu_off);
16653 if (attr_form_is_constant (member_loc))
16655 *ptr++ = DW_OP_addr;
16656 store_unsigned_integer (ptr, cu->header.addr_size, byte_order, offset);
16657 ptr += cu->header.addr_size;
16661 /* We have to copy the data here, because DW_OP_call4 will only
16662 use a DW_AT_location attribute. */
16663 memcpy (ptr, DW_BLOCK (member_loc)->data, DW_BLOCK (member_loc)->size);
16664 ptr += DW_BLOCK (member_loc)->size;
16667 *ptr++ = DW_OP_plus;
16668 gdb_assert (ptr - baton->data == baton->size);
16670 SYMBOL_LOCATION_BATON (sym) = baton;
16671 SYMBOL_ACLASS_INDEX (sym) = dwarf2_locexpr_index;
16674 /* Create appropriate locally-scoped variables for all the
16675 DW_TAG_common_block entries. Also create a struct common_block
16676 listing all such variables for `info common'. COMMON_BLOCK_DOMAIN
16677 is used to sepate the common blocks name namespace from regular
16681 read_common_block (struct die_info *die, struct dwarf2_cu *cu)
16683 struct attribute *attr;
16685 attr = dwarf2_attr (die, DW_AT_location, cu);
16688 /* Support the .debug_loc offsets. */
16689 if (attr_form_is_block (attr))
16693 else if (attr_form_is_section_offset (attr))
16695 dwarf2_complex_location_expr_complaint ();
16700 dwarf2_invalid_attrib_class_complaint ("DW_AT_location",
16701 "common block member");
16706 if (die->child != NULL)
16708 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
16709 struct die_info *child_die;
16710 size_t n_entries = 0, size;
16711 struct common_block *common_block;
16712 struct symbol *sym;
16714 for (child_die = die->child;
16715 child_die && child_die->tag;
16716 child_die = sibling_die (child_die))
16719 size = (sizeof (struct common_block)
16720 + (n_entries - 1) * sizeof (struct symbol *));
16722 = (struct common_block *) obstack_alloc (&objfile->objfile_obstack,
16724 memset (common_block->contents, 0, n_entries * sizeof (struct symbol *));
16725 common_block->n_entries = 0;
16727 for (child_die = die->child;
16728 child_die && child_die->tag;
16729 child_die = sibling_die (child_die))
16731 /* Create the symbol in the DW_TAG_common_block block in the current
16733 sym = new_symbol (child_die, NULL, cu);
16736 struct attribute *member_loc;
16738 common_block->contents[common_block->n_entries++] = sym;
16740 member_loc = dwarf2_attr (child_die, DW_AT_data_member_location,
16744 /* GDB has handled this for a long time, but it is
16745 not specified by DWARF. It seems to have been
16746 emitted by gfortran at least as recently as:
16747 http://gcc.gnu.org/bugzilla/show_bug.cgi?id=23057. */
16748 complaint (&symfile_complaints,
16749 _("Variable in common block has "
16750 "DW_AT_data_member_location "
16751 "- DIE at 0x%x [in module %s]"),
16752 to_underlying (child_die->sect_off),
16753 objfile_name (objfile));
16755 if (attr_form_is_section_offset (member_loc))
16756 dwarf2_complex_location_expr_complaint ();
16757 else if (attr_form_is_constant (member_loc)
16758 || attr_form_is_block (member_loc))
16761 mark_common_block_symbol_computed (sym, die, attr,
16765 dwarf2_complex_location_expr_complaint ();
16770 sym = new_symbol (die, objfile_type (objfile)->builtin_void, cu);
16771 SYMBOL_VALUE_COMMON_BLOCK (sym) = common_block;
16775 /* Create a type for a C++ namespace. */
16777 static struct type *
16778 read_namespace_type (struct die_info *die, struct dwarf2_cu *cu)
16780 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
16781 const char *previous_prefix, *name;
16785 /* For extensions, reuse the type of the original namespace. */
16786 if (dwarf2_attr (die, DW_AT_extension, cu) != NULL)
16788 struct die_info *ext_die;
16789 struct dwarf2_cu *ext_cu = cu;
16791 ext_die = dwarf2_extension (die, &ext_cu);
16792 type = read_type_die (ext_die, ext_cu);
16794 /* EXT_CU may not be the same as CU.
16795 Ensure TYPE is recorded with CU in die_type_hash. */
16796 return set_die_type (die, type, cu);
16799 name = namespace_name (die, &is_anonymous, cu);
16801 /* Now build the name of the current namespace. */
16803 previous_prefix = determine_prefix (die, cu);
16804 if (previous_prefix[0] != '\0')
16805 name = typename_concat (&objfile->objfile_obstack,
16806 previous_prefix, name, 0, cu);
16808 /* Create the type. */
16809 type = init_type (objfile, TYPE_CODE_NAMESPACE, 0, name);
16810 TYPE_TAG_NAME (type) = TYPE_NAME (type);
16812 return set_die_type (die, type, cu);
16815 /* Read a namespace scope. */
16818 read_namespace (struct die_info *die, struct dwarf2_cu *cu)
16820 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
16823 /* Add a symbol associated to this if we haven't seen the namespace
16824 before. Also, add a using directive if it's an anonymous
16827 if (dwarf2_attr (die, DW_AT_extension, cu) == NULL)
16831 type = read_type_die (die, cu);
16832 new_symbol (die, type, cu);
16834 namespace_name (die, &is_anonymous, cu);
16837 const char *previous_prefix = determine_prefix (die, cu);
16839 std::vector<const char *> excludes;
16840 add_using_directive (using_directives (cu->language),
16841 previous_prefix, TYPE_NAME (type), NULL,
16842 NULL, excludes, 0, &objfile->objfile_obstack);
16846 if (die->child != NULL)
16848 struct die_info *child_die = die->child;
16850 while (child_die && child_die->tag)
16852 process_die (child_die, cu);
16853 child_die = sibling_die (child_die);
16858 /* Read a Fortran module as type. This DIE can be only a declaration used for
16859 imported module. Still we need that type as local Fortran "use ... only"
16860 declaration imports depend on the created type in determine_prefix. */
16862 static struct type *
16863 read_module_type (struct die_info *die, struct dwarf2_cu *cu)
16865 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
16866 const char *module_name;
16869 module_name = dwarf2_name (die, cu);
16871 complaint (&symfile_complaints,
16872 _("DW_TAG_module has no name, offset 0x%x"),
16873 to_underlying (die->sect_off));
16874 type = init_type (objfile, TYPE_CODE_MODULE, 0, module_name);
16876 /* determine_prefix uses TYPE_TAG_NAME. */
16877 TYPE_TAG_NAME (type) = TYPE_NAME (type);
16879 return set_die_type (die, type, cu);
16882 /* Read a Fortran module. */
16885 read_module (struct die_info *die, struct dwarf2_cu *cu)
16887 struct die_info *child_die = die->child;
16890 type = read_type_die (die, cu);
16891 new_symbol (die, type, cu);
16893 while (child_die && child_die->tag)
16895 process_die (child_die, cu);
16896 child_die = sibling_die (child_die);
16900 /* Return the name of the namespace represented by DIE. Set
16901 *IS_ANONYMOUS to tell whether or not the namespace is an anonymous
16904 static const char *
16905 namespace_name (struct die_info *die, int *is_anonymous, struct dwarf2_cu *cu)
16907 struct die_info *current_die;
16908 const char *name = NULL;
16910 /* Loop through the extensions until we find a name. */
16912 for (current_die = die;
16913 current_die != NULL;
16914 current_die = dwarf2_extension (die, &cu))
16916 /* We don't use dwarf2_name here so that we can detect the absence
16917 of a name -> anonymous namespace. */
16918 name = dwarf2_string_attr (die, DW_AT_name, cu);
16924 /* Is it an anonymous namespace? */
16926 *is_anonymous = (name == NULL);
16928 name = CP_ANONYMOUS_NAMESPACE_STR;
16933 /* Extract all information from a DW_TAG_pointer_type DIE and add to
16934 the user defined type vector. */
16936 static struct type *
16937 read_tag_pointer_type (struct die_info *die, struct dwarf2_cu *cu)
16939 struct gdbarch *gdbarch
16940 = get_objfile_arch (cu->per_cu->dwarf2_per_objfile->objfile);
16941 struct comp_unit_head *cu_header = &cu->header;
16943 struct attribute *attr_byte_size;
16944 struct attribute *attr_address_class;
16945 int byte_size, addr_class;
16946 struct type *target_type;
16948 target_type = die_type (die, cu);
16950 /* The die_type call above may have already set the type for this DIE. */
16951 type = get_die_type (die, cu);
16955 type = lookup_pointer_type (target_type);
16957 attr_byte_size = dwarf2_attr (die, DW_AT_byte_size, cu);
16958 if (attr_byte_size)
16959 byte_size = DW_UNSND (attr_byte_size);
16961 byte_size = cu_header->addr_size;
16963 attr_address_class = dwarf2_attr (die, DW_AT_address_class, cu);
16964 if (attr_address_class)
16965 addr_class = DW_UNSND (attr_address_class);
16967 addr_class = DW_ADDR_none;
16969 /* If the pointer size or address class is different than the
16970 default, create a type variant marked as such and set the
16971 length accordingly. */
16972 if (TYPE_LENGTH (type) != byte_size || addr_class != DW_ADDR_none)
16974 if (gdbarch_address_class_type_flags_p (gdbarch))
16978 type_flags = gdbarch_address_class_type_flags
16979 (gdbarch, byte_size, addr_class);
16980 gdb_assert ((type_flags & ~TYPE_INSTANCE_FLAG_ADDRESS_CLASS_ALL)
16982 type = make_type_with_address_space (type, type_flags);
16984 else if (TYPE_LENGTH (type) != byte_size)
16986 complaint (&symfile_complaints,
16987 _("invalid pointer size %d"), byte_size);
16991 /* Should we also complain about unhandled address classes? */
16995 TYPE_LENGTH (type) = byte_size;
16996 return set_die_type (die, type, cu);
16999 /* Extract all information from a DW_TAG_ptr_to_member_type DIE and add to
17000 the user defined type vector. */
17002 static struct type *
17003 read_tag_ptr_to_member_type (struct die_info *die, struct dwarf2_cu *cu)
17006 struct type *to_type;
17007 struct type *domain;
17009 to_type = die_type (die, cu);
17010 domain = die_containing_type (die, cu);
17012 /* The calls above may have already set the type for this DIE. */
17013 type = get_die_type (die, cu);
17017 if (TYPE_CODE (check_typedef (to_type)) == TYPE_CODE_METHOD)
17018 type = lookup_methodptr_type (to_type);
17019 else if (TYPE_CODE (check_typedef (to_type)) == TYPE_CODE_FUNC)
17021 struct type *new_type
17022 = alloc_type (cu->per_cu->dwarf2_per_objfile->objfile);
17024 smash_to_method_type (new_type, domain, TYPE_TARGET_TYPE (to_type),
17025 TYPE_FIELDS (to_type), TYPE_NFIELDS (to_type),
17026 TYPE_VARARGS (to_type));
17027 type = lookup_methodptr_type (new_type);
17030 type = lookup_memberptr_type (to_type, domain);
17032 return set_die_type (die, type, cu);
17035 /* Extract all information from a DW_TAG_{rvalue_,}reference_type DIE and add to
17036 the user defined type vector. */
17038 static struct type *
17039 read_tag_reference_type (struct die_info *die, struct dwarf2_cu *cu,
17040 enum type_code refcode)
17042 struct comp_unit_head *cu_header = &cu->header;
17043 struct type *type, *target_type;
17044 struct attribute *attr;
17046 gdb_assert (refcode == TYPE_CODE_REF || refcode == TYPE_CODE_RVALUE_REF);
17048 target_type = die_type (die, cu);
17050 /* The die_type call above may have already set the type for this DIE. */
17051 type = get_die_type (die, cu);
17055 type = lookup_reference_type (target_type, refcode);
17056 attr = dwarf2_attr (die, DW_AT_byte_size, cu);
17059 TYPE_LENGTH (type) = DW_UNSND (attr);
17063 TYPE_LENGTH (type) = cu_header->addr_size;
17065 return set_die_type (die, type, cu);
17068 /* Add the given cv-qualifiers to the element type of the array. GCC
17069 outputs DWARF type qualifiers that apply to an array, not the
17070 element type. But GDB relies on the array element type to carry
17071 the cv-qualifiers. This mimics section 6.7.3 of the C99
17074 static struct type *
17075 add_array_cv_type (struct die_info *die, struct dwarf2_cu *cu,
17076 struct type *base_type, int cnst, int voltl)
17078 struct type *el_type, *inner_array;
17080 base_type = copy_type (base_type);
17081 inner_array = base_type;
17083 while (TYPE_CODE (TYPE_TARGET_TYPE (inner_array)) == TYPE_CODE_ARRAY)
17085 TYPE_TARGET_TYPE (inner_array) =
17086 copy_type (TYPE_TARGET_TYPE (inner_array));
17087 inner_array = TYPE_TARGET_TYPE (inner_array);
17090 el_type = TYPE_TARGET_TYPE (inner_array);
17091 cnst |= TYPE_CONST (el_type);
17092 voltl |= TYPE_VOLATILE (el_type);
17093 TYPE_TARGET_TYPE (inner_array) = make_cv_type (cnst, voltl, el_type, NULL);
17095 return set_die_type (die, base_type, cu);
17098 static struct type *
17099 read_tag_const_type (struct die_info *die, struct dwarf2_cu *cu)
17101 struct type *base_type, *cv_type;
17103 base_type = die_type (die, cu);
17105 /* The die_type call above may have already set the type for this DIE. */
17106 cv_type = get_die_type (die, cu);
17110 /* In case the const qualifier is applied to an array type, the element type
17111 is so qualified, not the array type (section 6.7.3 of C99). */
17112 if (TYPE_CODE (base_type) == TYPE_CODE_ARRAY)
17113 return add_array_cv_type (die, cu, base_type, 1, 0);
17115 cv_type = make_cv_type (1, TYPE_VOLATILE (base_type), base_type, 0);
17116 return set_die_type (die, cv_type, cu);
17119 static struct type *
17120 read_tag_volatile_type (struct die_info *die, struct dwarf2_cu *cu)
17122 struct type *base_type, *cv_type;
17124 base_type = die_type (die, cu);
17126 /* The die_type call above may have already set the type for this DIE. */
17127 cv_type = get_die_type (die, cu);
17131 /* In case the volatile qualifier is applied to an array type, the
17132 element type is so qualified, not the array type (section 6.7.3
17134 if (TYPE_CODE (base_type) == TYPE_CODE_ARRAY)
17135 return add_array_cv_type (die, cu, base_type, 0, 1);
17137 cv_type = make_cv_type (TYPE_CONST (base_type), 1, base_type, 0);
17138 return set_die_type (die, cv_type, cu);
17141 /* Handle DW_TAG_restrict_type. */
17143 static struct type *
17144 read_tag_restrict_type (struct die_info *die, struct dwarf2_cu *cu)
17146 struct type *base_type, *cv_type;
17148 base_type = die_type (die, cu);
17150 /* The die_type call above may have already set the type for this DIE. */
17151 cv_type = get_die_type (die, cu);
17155 cv_type = make_restrict_type (base_type);
17156 return set_die_type (die, cv_type, cu);
17159 /* Handle DW_TAG_atomic_type. */
17161 static struct type *
17162 read_tag_atomic_type (struct die_info *die, struct dwarf2_cu *cu)
17164 struct type *base_type, *cv_type;
17166 base_type = die_type (die, cu);
17168 /* The die_type call above may have already set the type for this DIE. */
17169 cv_type = get_die_type (die, cu);
17173 cv_type = make_atomic_type (base_type);
17174 return set_die_type (die, cv_type, cu);
17177 /* Extract all information from a DW_TAG_string_type DIE and add to
17178 the user defined type vector. It isn't really a user defined type,
17179 but it behaves like one, with other DIE's using an AT_user_def_type
17180 attribute to reference it. */
17182 static struct type *
17183 read_tag_string_type (struct die_info *die, struct dwarf2_cu *cu)
17185 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
17186 struct gdbarch *gdbarch = get_objfile_arch (objfile);
17187 struct type *type, *range_type, *index_type, *char_type;
17188 struct attribute *attr;
17189 unsigned int length;
17191 attr = dwarf2_attr (die, DW_AT_string_length, cu);
17194 length = DW_UNSND (attr);
17198 /* Check for the DW_AT_byte_size attribute. */
17199 attr = dwarf2_attr (die, DW_AT_byte_size, cu);
17202 length = DW_UNSND (attr);
17210 index_type = objfile_type (objfile)->builtin_int;
17211 range_type = create_static_range_type (NULL, index_type, 1, length);
17212 char_type = language_string_char_type (cu->language_defn, gdbarch);
17213 type = create_string_type (NULL, char_type, range_type);
17215 return set_die_type (die, type, cu);
17218 /* Assuming that DIE corresponds to a function, returns nonzero
17219 if the function is prototyped. */
17222 prototyped_function_p (struct die_info *die, struct dwarf2_cu *cu)
17224 struct attribute *attr;
17226 attr = dwarf2_attr (die, DW_AT_prototyped, cu);
17227 if (attr && (DW_UNSND (attr) != 0))
17230 /* The DWARF standard implies that the DW_AT_prototyped attribute
17231 is only meaninful for C, but the concept also extends to other
17232 languages that allow unprototyped functions (Eg: Objective C).
17233 For all other languages, assume that functions are always
17235 if (cu->language != language_c
17236 && cu->language != language_objc
17237 && cu->language != language_opencl)
17240 /* RealView does not emit DW_AT_prototyped. We can not distinguish
17241 prototyped and unprototyped functions; default to prototyped,
17242 since that is more common in modern code (and RealView warns
17243 about unprototyped functions). */
17244 if (producer_is_realview (cu->producer))
17250 /* Handle DIES due to C code like:
17254 int (*funcp)(int a, long l);
17258 ('funcp' generates a DW_TAG_subroutine_type DIE). */
17260 static struct type *
17261 read_subroutine_type (struct die_info *die, struct dwarf2_cu *cu)
17263 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
17264 struct type *type; /* Type that this function returns. */
17265 struct type *ftype; /* Function that returns above type. */
17266 struct attribute *attr;
17268 type = die_type (die, cu);
17270 /* The die_type call above may have already set the type for this DIE. */
17271 ftype = get_die_type (die, cu);
17275 ftype = lookup_function_type (type);
17277 if (prototyped_function_p (die, cu))
17278 TYPE_PROTOTYPED (ftype) = 1;
17280 /* Store the calling convention in the type if it's available in
17281 the subroutine die. Otherwise set the calling convention to
17282 the default value DW_CC_normal. */
17283 attr = dwarf2_attr (die, DW_AT_calling_convention, cu);
17285 TYPE_CALLING_CONVENTION (ftype) = DW_UNSND (attr);
17286 else if (cu->producer && strstr (cu->producer, "IBM XL C for OpenCL"))
17287 TYPE_CALLING_CONVENTION (ftype) = DW_CC_GDB_IBM_OpenCL;
17289 TYPE_CALLING_CONVENTION (ftype) = DW_CC_normal;
17291 /* Record whether the function returns normally to its caller or not
17292 if the DWARF producer set that information. */
17293 attr = dwarf2_attr (die, DW_AT_noreturn, cu);
17294 if (attr && (DW_UNSND (attr) != 0))
17295 TYPE_NO_RETURN (ftype) = 1;
17297 /* We need to add the subroutine type to the die immediately so
17298 we don't infinitely recurse when dealing with parameters
17299 declared as the same subroutine type. */
17300 set_die_type (die, ftype, cu);
17302 if (die->child != NULL)
17304 struct type *void_type = objfile_type (objfile)->builtin_void;
17305 struct die_info *child_die;
17306 int nparams, iparams;
17308 /* Count the number of parameters.
17309 FIXME: GDB currently ignores vararg functions, but knows about
17310 vararg member functions. */
17312 child_die = die->child;
17313 while (child_die && child_die->tag)
17315 if (child_die->tag == DW_TAG_formal_parameter)
17317 else if (child_die->tag == DW_TAG_unspecified_parameters)
17318 TYPE_VARARGS (ftype) = 1;
17319 child_die = sibling_die (child_die);
17322 /* Allocate storage for parameters and fill them in. */
17323 TYPE_NFIELDS (ftype) = nparams;
17324 TYPE_FIELDS (ftype) = (struct field *)
17325 TYPE_ZALLOC (ftype, nparams * sizeof (struct field));
17327 /* TYPE_FIELD_TYPE must never be NULL. Pre-fill the array to ensure it
17328 even if we error out during the parameters reading below. */
17329 for (iparams = 0; iparams < nparams; iparams++)
17330 TYPE_FIELD_TYPE (ftype, iparams) = void_type;
17333 child_die = die->child;
17334 while (child_die && child_die->tag)
17336 if (child_die->tag == DW_TAG_formal_parameter)
17338 struct type *arg_type;
17340 /* DWARF version 2 has no clean way to discern C++
17341 static and non-static member functions. G++ helps
17342 GDB by marking the first parameter for non-static
17343 member functions (which is the this pointer) as
17344 artificial. We pass this information to
17345 dwarf2_add_member_fn via TYPE_FIELD_ARTIFICIAL.
17347 DWARF version 3 added DW_AT_object_pointer, which GCC
17348 4.5 does not yet generate. */
17349 attr = dwarf2_attr (child_die, DW_AT_artificial, cu);
17351 TYPE_FIELD_ARTIFICIAL (ftype, iparams) = DW_UNSND (attr);
17353 TYPE_FIELD_ARTIFICIAL (ftype, iparams) = 0;
17354 arg_type = die_type (child_die, cu);
17356 /* RealView does not mark THIS as const, which the testsuite
17357 expects. GCC marks THIS as const in method definitions,
17358 but not in the class specifications (GCC PR 43053). */
17359 if (cu->language == language_cplus && !TYPE_CONST (arg_type)
17360 && TYPE_FIELD_ARTIFICIAL (ftype, iparams))
17363 struct dwarf2_cu *arg_cu = cu;
17364 const char *name = dwarf2_name (child_die, cu);
17366 attr = dwarf2_attr (die, DW_AT_object_pointer, cu);
17369 /* If the compiler emits this, use it. */
17370 if (follow_die_ref (die, attr, &arg_cu) == child_die)
17373 else if (name && strcmp (name, "this") == 0)
17374 /* Function definitions will have the argument names. */
17376 else if (name == NULL && iparams == 0)
17377 /* Declarations may not have the names, so like
17378 elsewhere in GDB, assume an artificial first
17379 argument is "this". */
17383 arg_type = make_cv_type (1, TYPE_VOLATILE (arg_type),
17387 TYPE_FIELD_TYPE (ftype, iparams) = arg_type;
17390 child_die = sibling_die (child_die);
17397 static struct type *
17398 read_typedef (struct die_info *die, struct dwarf2_cu *cu)
17400 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
17401 const char *name = NULL;
17402 struct type *this_type, *target_type;
17404 name = dwarf2_full_name (NULL, die, cu);
17405 this_type = init_type (objfile, TYPE_CODE_TYPEDEF, 0, name);
17406 TYPE_TARGET_STUB (this_type) = 1;
17407 set_die_type (die, this_type, cu);
17408 target_type = die_type (die, cu);
17409 if (target_type != this_type)
17410 TYPE_TARGET_TYPE (this_type) = target_type;
17413 /* Self-referential typedefs are, it seems, not allowed by the DWARF
17414 spec and cause infinite loops in GDB. */
17415 complaint (&symfile_complaints,
17416 _("Self-referential DW_TAG_typedef "
17417 "- DIE at 0x%x [in module %s]"),
17418 to_underlying (die->sect_off), objfile_name (objfile));
17419 TYPE_TARGET_TYPE (this_type) = NULL;
17424 /* Allocate a floating-point type of size BITS and name NAME. Pass NAME_HINT
17425 (which may be different from NAME) to the architecture back-end to allow
17426 it to guess the correct format if necessary. */
17428 static struct type *
17429 dwarf2_init_float_type (struct objfile *objfile, int bits, const char *name,
17430 const char *name_hint)
17432 struct gdbarch *gdbarch = get_objfile_arch (objfile);
17433 const struct floatformat **format;
17436 format = gdbarch_floatformat_for_type (gdbarch, name_hint, bits);
17438 type = init_float_type (objfile, bits, name, format);
17440 type = init_type (objfile, TYPE_CODE_ERROR, bits, name);
17445 /* Find a representation of a given base type and install
17446 it in the TYPE field of the die. */
17448 static struct type *
17449 read_base_type (struct die_info *die, struct dwarf2_cu *cu)
17451 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
17453 struct attribute *attr;
17454 int encoding = 0, bits = 0;
17457 attr = dwarf2_attr (die, DW_AT_encoding, cu);
17460 encoding = DW_UNSND (attr);
17462 attr = dwarf2_attr (die, DW_AT_byte_size, cu);
17465 bits = DW_UNSND (attr) * TARGET_CHAR_BIT;
17467 name = dwarf2_name (die, cu);
17470 complaint (&symfile_complaints,
17471 _("DW_AT_name missing from DW_TAG_base_type"));
17476 case DW_ATE_address:
17477 /* Turn DW_ATE_address into a void * pointer. */
17478 type = init_type (objfile, TYPE_CODE_VOID, TARGET_CHAR_BIT, NULL);
17479 type = init_pointer_type (objfile, bits, name, type);
17481 case DW_ATE_boolean:
17482 type = init_boolean_type (objfile, bits, 1, name);
17484 case DW_ATE_complex_float:
17485 type = dwarf2_init_float_type (objfile, bits / 2, NULL, name);
17486 type = init_complex_type (objfile, name, type);
17488 case DW_ATE_decimal_float:
17489 type = init_decfloat_type (objfile, bits, name);
17492 type = dwarf2_init_float_type (objfile, bits, name, name);
17494 case DW_ATE_signed:
17495 type = init_integer_type (objfile, bits, 0, name);
17497 case DW_ATE_unsigned:
17498 if (cu->language == language_fortran
17500 && startswith (name, "character("))
17501 type = init_character_type (objfile, bits, 1, name);
17503 type = init_integer_type (objfile, bits, 1, name);
17505 case DW_ATE_signed_char:
17506 if (cu->language == language_ada || cu->language == language_m2
17507 || cu->language == language_pascal
17508 || cu->language == language_fortran)
17509 type = init_character_type (objfile, bits, 0, name);
17511 type = init_integer_type (objfile, bits, 0, name);
17513 case DW_ATE_unsigned_char:
17514 if (cu->language == language_ada || cu->language == language_m2
17515 || cu->language == language_pascal
17516 || cu->language == language_fortran
17517 || cu->language == language_rust)
17518 type = init_character_type (objfile, bits, 1, name);
17520 type = init_integer_type (objfile, bits, 1, name);
17524 gdbarch *arch = get_objfile_arch (objfile);
17527 type = builtin_type (arch)->builtin_char16;
17528 else if (bits == 32)
17529 type = builtin_type (arch)->builtin_char32;
17532 complaint (&symfile_complaints,
17533 _("unsupported DW_ATE_UTF bit size: '%d'"),
17535 type = init_integer_type (objfile, bits, 1, name);
17537 return set_die_type (die, type, cu);
17542 complaint (&symfile_complaints, _("unsupported DW_AT_encoding: '%s'"),
17543 dwarf_type_encoding_name (encoding));
17544 type = init_type (objfile, TYPE_CODE_ERROR, bits, name);
17548 if (name && strcmp (name, "char") == 0)
17549 TYPE_NOSIGN (type) = 1;
17551 return set_die_type (die, type, cu);
17554 /* Parse dwarf attribute if it's a block, reference or constant and put the
17555 resulting value of the attribute into struct bound_prop.
17556 Returns 1 if ATTR could be resolved into PROP, 0 otherwise. */
17559 attr_to_dynamic_prop (const struct attribute *attr, struct die_info *die,
17560 struct dwarf2_cu *cu, struct dynamic_prop *prop)
17562 struct dwarf2_property_baton *baton;
17563 struct obstack *obstack
17564 = &cu->per_cu->dwarf2_per_objfile->objfile->objfile_obstack;
17566 if (attr == NULL || prop == NULL)
17569 if (attr_form_is_block (attr))
17571 baton = XOBNEW (obstack, struct dwarf2_property_baton);
17572 baton->referenced_type = NULL;
17573 baton->locexpr.per_cu = cu->per_cu;
17574 baton->locexpr.size = DW_BLOCK (attr)->size;
17575 baton->locexpr.data = DW_BLOCK (attr)->data;
17576 prop->data.baton = baton;
17577 prop->kind = PROP_LOCEXPR;
17578 gdb_assert (prop->data.baton != NULL);
17580 else if (attr_form_is_ref (attr))
17582 struct dwarf2_cu *target_cu = cu;
17583 struct die_info *target_die;
17584 struct attribute *target_attr;
17586 target_die = follow_die_ref (die, attr, &target_cu);
17587 target_attr = dwarf2_attr (target_die, DW_AT_location, target_cu);
17588 if (target_attr == NULL)
17589 target_attr = dwarf2_attr (target_die, DW_AT_data_member_location,
17591 if (target_attr == NULL)
17594 switch (target_attr->name)
17596 case DW_AT_location:
17597 if (attr_form_is_section_offset (target_attr))
17599 baton = XOBNEW (obstack, struct dwarf2_property_baton);
17600 baton->referenced_type = die_type (target_die, target_cu);
17601 fill_in_loclist_baton (cu, &baton->loclist, target_attr);
17602 prop->data.baton = baton;
17603 prop->kind = PROP_LOCLIST;
17604 gdb_assert (prop->data.baton != NULL);
17606 else if (attr_form_is_block (target_attr))
17608 baton = XOBNEW (obstack, struct dwarf2_property_baton);
17609 baton->referenced_type = die_type (target_die, target_cu);
17610 baton->locexpr.per_cu = cu->per_cu;
17611 baton->locexpr.size = DW_BLOCK (target_attr)->size;
17612 baton->locexpr.data = DW_BLOCK (target_attr)->data;
17613 prop->data.baton = baton;
17614 prop->kind = PROP_LOCEXPR;
17615 gdb_assert (prop->data.baton != NULL);
17619 dwarf2_invalid_attrib_class_complaint ("DW_AT_location",
17620 "dynamic property");
17624 case DW_AT_data_member_location:
17628 if (!handle_data_member_location (target_die, target_cu,
17632 baton = XOBNEW (obstack, struct dwarf2_property_baton);
17633 baton->referenced_type = read_type_die (target_die->parent,
17635 baton->offset_info.offset = offset;
17636 baton->offset_info.type = die_type (target_die, target_cu);
17637 prop->data.baton = baton;
17638 prop->kind = PROP_ADDR_OFFSET;
17643 else if (attr_form_is_constant (attr))
17645 prop->data.const_val = dwarf2_get_attr_constant_value (attr, 0);
17646 prop->kind = PROP_CONST;
17650 dwarf2_invalid_attrib_class_complaint (dwarf_form_name (attr->form),
17651 dwarf2_name (die, cu));
17658 /* Read the given DW_AT_subrange DIE. */
17660 static struct type *
17661 read_subrange_type (struct die_info *die, struct dwarf2_cu *cu)
17663 struct type *base_type, *orig_base_type;
17664 struct type *range_type;
17665 struct attribute *attr;
17666 struct dynamic_prop low, high;
17667 int low_default_is_valid;
17668 int high_bound_is_count = 0;
17670 LONGEST negative_mask;
17672 orig_base_type = die_type (die, cu);
17673 /* If ORIG_BASE_TYPE is a typedef, it will not be TYPE_UNSIGNED,
17674 whereas the real type might be. So, we use ORIG_BASE_TYPE when
17675 creating the range type, but we use the result of check_typedef
17676 when examining properties of the type. */
17677 base_type = check_typedef (orig_base_type);
17679 /* The die_type call above may have already set the type for this DIE. */
17680 range_type = get_die_type (die, cu);
17684 low.kind = PROP_CONST;
17685 high.kind = PROP_CONST;
17686 high.data.const_val = 0;
17688 /* Set LOW_DEFAULT_IS_VALID if current language and DWARF version allow
17689 omitting DW_AT_lower_bound. */
17690 switch (cu->language)
17693 case language_cplus:
17694 low.data.const_val = 0;
17695 low_default_is_valid = 1;
17697 case language_fortran:
17698 low.data.const_val = 1;
17699 low_default_is_valid = 1;
17702 case language_objc:
17703 case language_rust:
17704 low.data.const_val = 0;
17705 low_default_is_valid = (cu->header.version >= 4);
17709 case language_pascal:
17710 low.data.const_val = 1;
17711 low_default_is_valid = (cu->header.version >= 4);
17714 low.data.const_val = 0;
17715 low_default_is_valid = 0;
17719 attr = dwarf2_attr (die, DW_AT_lower_bound, cu);
17721 attr_to_dynamic_prop (attr, die, cu, &low);
17722 else if (!low_default_is_valid)
17723 complaint (&symfile_complaints, _("Missing DW_AT_lower_bound "
17724 "- DIE at 0x%x [in module %s]"),
17725 to_underlying (die->sect_off),
17726 objfile_name (cu->per_cu->dwarf2_per_objfile->objfile));
17728 attr = dwarf2_attr (die, DW_AT_upper_bound, cu);
17729 if (!attr_to_dynamic_prop (attr, die, cu, &high))
17731 attr = dwarf2_attr (die, DW_AT_count, cu);
17732 if (attr_to_dynamic_prop (attr, die, cu, &high))
17734 /* If bounds are constant do the final calculation here. */
17735 if (low.kind == PROP_CONST && high.kind == PROP_CONST)
17736 high.data.const_val = low.data.const_val + high.data.const_val - 1;
17738 high_bound_is_count = 1;
17742 /* Dwarf-2 specifications explicitly allows to create subrange types
17743 without specifying a base type.
17744 In that case, the base type must be set to the type of
17745 the lower bound, upper bound or count, in that order, if any of these
17746 three attributes references an object that has a type.
17747 If no base type is found, the Dwarf-2 specifications say that
17748 a signed integer type of size equal to the size of an address should
17750 For the following C code: `extern char gdb_int [];'
17751 GCC produces an empty range DIE.
17752 FIXME: muller/2010-05-28: Possible references to object for low bound,
17753 high bound or count are not yet handled by this code. */
17754 if (TYPE_CODE (base_type) == TYPE_CODE_VOID)
17756 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
17757 struct gdbarch *gdbarch = get_objfile_arch (objfile);
17758 int addr_size = gdbarch_addr_bit (gdbarch) /8;
17759 struct type *int_type = objfile_type (objfile)->builtin_int;
17761 /* Test "int", "long int", and "long long int" objfile types,
17762 and select the first one having a size above or equal to the
17763 architecture address size. */
17764 if (int_type && TYPE_LENGTH (int_type) >= addr_size)
17765 base_type = int_type;
17768 int_type = objfile_type (objfile)->builtin_long;
17769 if (int_type && TYPE_LENGTH (int_type) >= addr_size)
17770 base_type = int_type;
17773 int_type = objfile_type (objfile)->builtin_long_long;
17774 if (int_type && TYPE_LENGTH (int_type) >= addr_size)
17775 base_type = int_type;
17780 /* Normally, the DWARF producers are expected to use a signed
17781 constant form (Eg. DW_FORM_sdata) to express negative bounds.
17782 But this is unfortunately not always the case, as witnessed
17783 with GCC, for instance, where the ambiguous DW_FORM_dataN form
17784 is used instead. To work around that ambiguity, we treat
17785 the bounds as signed, and thus sign-extend their values, when
17786 the base type is signed. */
17788 -((LONGEST) 1 << (TYPE_LENGTH (base_type) * TARGET_CHAR_BIT - 1));
17789 if (low.kind == PROP_CONST
17790 && !TYPE_UNSIGNED (base_type) && (low.data.const_val & negative_mask))
17791 low.data.const_val |= negative_mask;
17792 if (high.kind == PROP_CONST
17793 && !TYPE_UNSIGNED (base_type) && (high.data.const_val & negative_mask))
17794 high.data.const_val |= negative_mask;
17796 range_type = create_range_type (NULL, orig_base_type, &low, &high);
17798 if (high_bound_is_count)
17799 TYPE_RANGE_DATA (range_type)->flag_upper_bound_is_count = 1;
17801 /* Ada expects an empty array on no boundary attributes. */
17802 if (attr == NULL && cu->language != language_ada)
17803 TYPE_HIGH_BOUND_KIND (range_type) = PROP_UNDEFINED;
17805 name = dwarf2_name (die, cu);
17807 TYPE_NAME (range_type) = name;
17809 attr = dwarf2_attr (die, DW_AT_byte_size, cu);
17811 TYPE_LENGTH (range_type) = DW_UNSND (attr);
17813 set_die_type (die, range_type, cu);
17815 /* set_die_type should be already done. */
17816 set_descriptive_type (range_type, die, cu);
17821 static struct type *
17822 read_unspecified_type (struct die_info *die, struct dwarf2_cu *cu)
17826 type = init_type (cu->per_cu->dwarf2_per_objfile->objfile, TYPE_CODE_VOID,0,
17828 TYPE_NAME (type) = dwarf2_name (die, cu);
17830 /* In Ada, an unspecified type is typically used when the description
17831 of the type is defered to a different unit. When encountering
17832 such a type, we treat it as a stub, and try to resolve it later on,
17834 if (cu->language == language_ada)
17835 TYPE_STUB (type) = 1;
17837 return set_die_type (die, type, cu);
17840 /* Read a single die and all its descendents. Set the die's sibling
17841 field to NULL; set other fields in the die correctly, and set all
17842 of the descendents' fields correctly. Set *NEW_INFO_PTR to the
17843 location of the info_ptr after reading all of those dies. PARENT
17844 is the parent of the die in question. */
17846 static struct die_info *
17847 read_die_and_children (const struct die_reader_specs *reader,
17848 const gdb_byte *info_ptr,
17849 const gdb_byte **new_info_ptr,
17850 struct die_info *parent)
17852 struct die_info *die;
17853 const gdb_byte *cur_ptr;
17856 cur_ptr = read_full_die_1 (reader, &die, info_ptr, &has_children, 0);
17859 *new_info_ptr = cur_ptr;
17862 store_in_ref_table (die, reader->cu);
17865 die->child = read_die_and_siblings_1 (reader, cur_ptr, new_info_ptr, die);
17869 *new_info_ptr = cur_ptr;
17872 die->sibling = NULL;
17873 die->parent = parent;
17877 /* Read a die, all of its descendents, and all of its siblings; set
17878 all of the fields of all of the dies correctly. Arguments are as
17879 in read_die_and_children. */
17881 static struct die_info *
17882 read_die_and_siblings_1 (const struct die_reader_specs *reader,
17883 const gdb_byte *info_ptr,
17884 const gdb_byte **new_info_ptr,
17885 struct die_info *parent)
17887 struct die_info *first_die, *last_sibling;
17888 const gdb_byte *cur_ptr;
17890 cur_ptr = info_ptr;
17891 first_die = last_sibling = NULL;
17895 struct die_info *die
17896 = read_die_and_children (reader, cur_ptr, &cur_ptr, parent);
17900 *new_info_ptr = cur_ptr;
17907 last_sibling->sibling = die;
17909 last_sibling = die;
17913 /* Read a die, all of its descendents, and all of its siblings; set
17914 all of the fields of all of the dies correctly. Arguments are as
17915 in read_die_and_children.
17916 This the main entry point for reading a DIE and all its children. */
17918 static struct die_info *
17919 read_die_and_siblings (const struct die_reader_specs *reader,
17920 const gdb_byte *info_ptr,
17921 const gdb_byte **new_info_ptr,
17922 struct die_info *parent)
17924 struct die_info *die = read_die_and_siblings_1 (reader, info_ptr,
17925 new_info_ptr, parent);
17927 if (dwarf_die_debug)
17929 fprintf_unfiltered (gdb_stdlog,
17930 "Read die from %s@0x%x of %s:\n",
17931 get_section_name (reader->die_section),
17932 (unsigned) (info_ptr - reader->die_section->buffer),
17933 bfd_get_filename (reader->abfd));
17934 dump_die (die, dwarf_die_debug);
17940 /* Read a die and all its attributes, leave space for NUM_EXTRA_ATTRS
17942 The caller is responsible for filling in the extra attributes
17943 and updating (*DIEP)->num_attrs.
17944 Set DIEP to point to a newly allocated die with its information,
17945 except for its child, sibling, and parent fields.
17946 Set HAS_CHILDREN to tell whether the die has children or not. */
17948 static const gdb_byte *
17949 read_full_die_1 (const struct die_reader_specs *reader,
17950 struct die_info **diep, const gdb_byte *info_ptr,
17951 int *has_children, int num_extra_attrs)
17953 unsigned int abbrev_number, bytes_read, i;
17954 struct abbrev_info *abbrev;
17955 struct die_info *die;
17956 struct dwarf2_cu *cu = reader->cu;
17957 bfd *abfd = reader->abfd;
17959 sect_offset sect_off = (sect_offset) (info_ptr - reader->buffer);
17960 abbrev_number = read_unsigned_leb128 (abfd, info_ptr, &bytes_read);
17961 info_ptr += bytes_read;
17962 if (!abbrev_number)
17969 abbrev = reader->abbrev_table->lookup_abbrev (abbrev_number);
17971 error (_("Dwarf Error: could not find abbrev number %d [in module %s]"),
17973 bfd_get_filename (abfd));
17975 die = dwarf_alloc_die (cu, abbrev->num_attrs + num_extra_attrs);
17976 die->sect_off = sect_off;
17977 die->tag = abbrev->tag;
17978 die->abbrev = abbrev_number;
17980 /* Make the result usable.
17981 The caller needs to update num_attrs after adding the extra
17983 die->num_attrs = abbrev->num_attrs;
17985 for (i = 0; i < abbrev->num_attrs; ++i)
17986 info_ptr = read_attribute (reader, &die->attrs[i], &abbrev->attrs[i],
17990 *has_children = abbrev->has_children;
17994 /* Read a die and all its attributes.
17995 Set DIEP to point to a newly allocated die with its information,
17996 except for its child, sibling, and parent fields.
17997 Set HAS_CHILDREN to tell whether the die has children or not. */
17999 static const gdb_byte *
18000 read_full_die (const struct die_reader_specs *reader,
18001 struct die_info **diep, const gdb_byte *info_ptr,
18004 const gdb_byte *result;
18006 result = read_full_die_1 (reader, diep, info_ptr, has_children, 0);
18008 if (dwarf_die_debug)
18010 fprintf_unfiltered (gdb_stdlog,
18011 "Read die from %s@0x%x of %s:\n",
18012 get_section_name (reader->die_section),
18013 (unsigned) (info_ptr - reader->die_section->buffer),
18014 bfd_get_filename (reader->abfd));
18015 dump_die (*diep, dwarf_die_debug);
18021 /* Abbreviation tables.
18023 In DWARF version 2, the description of the debugging information is
18024 stored in a separate .debug_abbrev section. Before we read any
18025 dies from a section we read in all abbreviations and install them
18026 in a hash table. */
18028 /* Allocate space for a struct abbrev_info object in ABBREV_TABLE. */
18030 struct abbrev_info *
18031 abbrev_table::alloc_abbrev ()
18033 struct abbrev_info *abbrev;
18035 abbrev = XOBNEW (&abbrev_obstack, struct abbrev_info);
18036 memset (abbrev, 0, sizeof (struct abbrev_info));
18041 /* Add an abbreviation to the table. */
18044 abbrev_table::add_abbrev (unsigned int abbrev_number,
18045 struct abbrev_info *abbrev)
18047 unsigned int hash_number;
18049 hash_number = abbrev_number % ABBREV_HASH_SIZE;
18050 abbrev->next = m_abbrevs[hash_number];
18051 m_abbrevs[hash_number] = abbrev;
18054 /* Look up an abbrev in the table.
18055 Returns NULL if the abbrev is not found. */
18057 struct abbrev_info *
18058 abbrev_table::lookup_abbrev (unsigned int abbrev_number)
18060 unsigned int hash_number;
18061 struct abbrev_info *abbrev;
18063 hash_number = abbrev_number % ABBREV_HASH_SIZE;
18064 abbrev = m_abbrevs[hash_number];
18068 if (abbrev->number == abbrev_number)
18070 abbrev = abbrev->next;
18075 /* Read in an abbrev table. */
18077 static abbrev_table_up
18078 abbrev_table_read_table (struct dwarf2_per_objfile *dwarf2_per_objfile,
18079 struct dwarf2_section_info *section,
18080 sect_offset sect_off)
18082 struct objfile *objfile = dwarf2_per_objfile->objfile;
18083 bfd *abfd = get_section_bfd_owner (section);
18084 const gdb_byte *abbrev_ptr;
18085 struct abbrev_info *cur_abbrev;
18086 unsigned int abbrev_number, bytes_read, abbrev_name;
18087 unsigned int abbrev_form;
18088 struct attr_abbrev *cur_attrs;
18089 unsigned int allocated_attrs;
18091 abbrev_table_up abbrev_table (new struct abbrev_table (sect_off));
18093 dwarf2_read_section (objfile, section);
18094 abbrev_ptr = section->buffer + to_underlying (sect_off);
18095 abbrev_number = read_unsigned_leb128 (abfd, abbrev_ptr, &bytes_read);
18096 abbrev_ptr += bytes_read;
18098 allocated_attrs = ATTR_ALLOC_CHUNK;
18099 cur_attrs = XNEWVEC (struct attr_abbrev, allocated_attrs);
18101 /* Loop until we reach an abbrev number of 0. */
18102 while (abbrev_number)
18104 cur_abbrev = abbrev_table->alloc_abbrev ();
18106 /* read in abbrev header */
18107 cur_abbrev->number = abbrev_number;
18109 = (enum dwarf_tag) read_unsigned_leb128 (abfd, abbrev_ptr, &bytes_read);
18110 abbrev_ptr += bytes_read;
18111 cur_abbrev->has_children = read_1_byte (abfd, abbrev_ptr);
18114 /* now read in declarations */
18117 LONGEST implicit_const;
18119 abbrev_name = read_unsigned_leb128 (abfd, abbrev_ptr, &bytes_read);
18120 abbrev_ptr += bytes_read;
18121 abbrev_form = read_unsigned_leb128 (abfd, abbrev_ptr, &bytes_read);
18122 abbrev_ptr += bytes_read;
18123 if (abbrev_form == DW_FORM_implicit_const)
18125 implicit_const = read_signed_leb128 (abfd, abbrev_ptr,
18127 abbrev_ptr += bytes_read;
18131 /* Initialize it due to a false compiler warning. */
18132 implicit_const = -1;
18135 if (abbrev_name == 0)
18138 if (cur_abbrev->num_attrs == allocated_attrs)
18140 allocated_attrs += ATTR_ALLOC_CHUNK;
18142 = XRESIZEVEC (struct attr_abbrev, cur_attrs, allocated_attrs);
18145 cur_attrs[cur_abbrev->num_attrs].name
18146 = (enum dwarf_attribute) abbrev_name;
18147 cur_attrs[cur_abbrev->num_attrs].form
18148 = (enum dwarf_form) abbrev_form;
18149 cur_attrs[cur_abbrev->num_attrs].implicit_const = implicit_const;
18150 ++cur_abbrev->num_attrs;
18153 cur_abbrev->attrs =
18154 XOBNEWVEC (&abbrev_table->abbrev_obstack, struct attr_abbrev,
18155 cur_abbrev->num_attrs);
18156 memcpy (cur_abbrev->attrs, cur_attrs,
18157 cur_abbrev->num_attrs * sizeof (struct attr_abbrev));
18159 abbrev_table->add_abbrev (abbrev_number, cur_abbrev);
18161 /* Get next abbreviation.
18162 Under Irix6 the abbreviations for a compilation unit are not
18163 always properly terminated with an abbrev number of 0.
18164 Exit loop if we encounter an abbreviation which we have
18165 already read (which means we are about to read the abbreviations
18166 for the next compile unit) or if the end of the abbreviation
18167 table is reached. */
18168 if ((unsigned int) (abbrev_ptr - section->buffer) >= section->size)
18170 abbrev_number = read_unsigned_leb128 (abfd, abbrev_ptr, &bytes_read);
18171 abbrev_ptr += bytes_read;
18172 if (abbrev_table->lookup_abbrev (abbrev_number) != NULL)
18177 return abbrev_table;
18180 /* Returns nonzero if TAG represents a type that we might generate a partial
18184 is_type_tag_for_partial (int tag)
18189 /* Some types that would be reasonable to generate partial symbols for,
18190 that we don't at present. */
18191 case DW_TAG_array_type:
18192 case DW_TAG_file_type:
18193 case DW_TAG_ptr_to_member_type:
18194 case DW_TAG_set_type:
18195 case DW_TAG_string_type:
18196 case DW_TAG_subroutine_type:
18198 case DW_TAG_base_type:
18199 case DW_TAG_class_type:
18200 case DW_TAG_interface_type:
18201 case DW_TAG_enumeration_type:
18202 case DW_TAG_structure_type:
18203 case DW_TAG_subrange_type:
18204 case DW_TAG_typedef:
18205 case DW_TAG_union_type:
18212 /* Load all DIEs that are interesting for partial symbols into memory. */
18214 static struct partial_die_info *
18215 load_partial_dies (const struct die_reader_specs *reader,
18216 const gdb_byte *info_ptr, int building_psymtab)
18218 struct dwarf2_cu *cu = reader->cu;
18219 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
18220 struct partial_die_info *part_die;
18221 struct partial_die_info *parent_die, *last_die, *first_die = NULL;
18222 unsigned int bytes_read;
18223 unsigned int load_all = 0;
18224 int nesting_level = 1;
18229 gdb_assert (cu->per_cu != NULL);
18230 if (cu->per_cu->load_all_dies)
18234 = htab_create_alloc_ex (cu->header.length / 12,
18238 &cu->comp_unit_obstack,
18239 hashtab_obstack_allocate,
18240 dummy_obstack_deallocate);
18242 part_die = XOBNEW (&cu->comp_unit_obstack, struct partial_die_info);
18246 abbrev_info *abbrev = peek_die_abbrev (*reader, info_ptr, &bytes_read);
18248 /* A NULL abbrev means the end of a series of children. */
18249 if (abbrev == NULL)
18251 if (--nesting_level == 0)
18253 /* PART_DIE was probably the last thing allocated on the
18254 comp_unit_obstack, so we could call obstack_free
18255 here. We don't do that because the waste is small,
18256 and will be cleaned up when we're done with this
18257 compilation unit. This way, we're also more robust
18258 against other users of the comp_unit_obstack. */
18261 info_ptr += bytes_read;
18262 last_die = parent_die;
18263 parent_die = parent_die->die_parent;
18267 /* Check for template arguments. We never save these; if
18268 they're seen, we just mark the parent, and go on our way. */
18269 if (parent_die != NULL
18270 && cu->language == language_cplus
18271 && (abbrev->tag == DW_TAG_template_type_param
18272 || abbrev->tag == DW_TAG_template_value_param))
18274 parent_die->has_template_arguments = 1;
18278 /* We don't need a partial DIE for the template argument. */
18279 info_ptr = skip_one_die (reader, info_ptr + bytes_read, abbrev);
18284 /* We only recurse into c++ subprograms looking for template arguments.
18285 Skip their other children. */
18287 && cu->language == language_cplus
18288 && parent_die != NULL
18289 && parent_die->tag == DW_TAG_subprogram)
18291 info_ptr = skip_one_die (reader, info_ptr + bytes_read, abbrev);
18295 /* Check whether this DIE is interesting enough to save. Normally
18296 we would not be interested in members here, but there may be
18297 later variables referencing them via DW_AT_specification (for
18298 static members). */
18300 && !is_type_tag_for_partial (abbrev->tag)
18301 && abbrev->tag != DW_TAG_constant
18302 && abbrev->tag != DW_TAG_enumerator
18303 && abbrev->tag != DW_TAG_subprogram
18304 && abbrev->tag != DW_TAG_inlined_subroutine
18305 && abbrev->tag != DW_TAG_lexical_block
18306 && abbrev->tag != DW_TAG_variable
18307 && abbrev->tag != DW_TAG_namespace
18308 && abbrev->tag != DW_TAG_module
18309 && abbrev->tag != DW_TAG_member
18310 && abbrev->tag != DW_TAG_imported_unit
18311 && abbrev->tag != DW_TAG_imported_declaration)
18313 /* Otherwise we skip to the next sibling, if any. */
18314 info_ptr = skip_one_die (reader, info_ptr + bytes_read, abbrev);
18318 info_ptr = read_partial_die (reader, part_die, abbrev, bytes_read,
18321 /* This two-pass algorithm for processing partial symbols has a
18322 high cost in cache pressure. Thus, handle some simple cases
18323 here which cover the majority of C partial symbols. DIEs
18324 which neither have specification tags in them, nor could have
18325 specification tags elsewhere pointing at them, can simply be
18326 processed and discarded.
18328 This segment is also optional; scan_partial_symbols and
18329 add_partial_symbol will handle these DIEs if we chain
18330 them in normally. When compilers which do not emit large
18331 quantities of duplicate debug information are more common,
18332 this code can probably be removed. */
18334 /* Any complete simple types at the top level (pretty much all
18335 of them, for a language without namespaces), can be processed
18337 if (parent_die == NULL
18338 && part_die->has_specification == 0
18339 && part_die->is_declaration == 0
18340 && ((part_die->tag == DW_TAG_typedef && !part_die->has_children)
18341 || part_die->tag == DW_TAG_base_type
18342 || part_die->tag == DW_TAG_subrange_type))
18344 if (building_psymtab && part_die->name != NULL)
18345 add_psymbol_to_list (part_die->name, strlen (part_die->name), 0,
18346 VAR_DOMAIN, LOC_TYPEDEF,
18347 &objfile->static_psymbols,
18348 0, cu->language, objfile);
18349 info_ptr = locate_pdi_sibling (reader, part_die, info_ptr);
18353 /* The exception for DW_TAG_typedef with has_children above is
18354 a workaround of GCC PR debug/47510. In the case of this complaint
18355 type_name_no_tag_or_error will error on such types later.
18357 GDB skipped children of DW_TAG_typedef by the shortcut above and then
18358 it could not find the child DIEs referenced later, this is checked
18359 above. In correct DWARF DW_TAG_typedef should have no children. */
18361 if (part_die->tag == DW_TAG_typedef && part_die->has_children)
18362 complaint (&symfile_complaints,
18363 _("DW_TAG_typedef has childen - GCC PR debug/47510 bug "
18364 "- DIE at 0x%x [in module %s]"),
18365 to_underlying (part_die->sect_off), objfile_name (objfile));
18367 /* If we're at the second level, and we're an enumerator, and
18368 our parent has no specification (meaning possibly lives in a
18369 namespace elsewhere), then we can add the partial symbol now
18370 instead of queueing it. */
18371 if (part_die->tag == DW_TAG_enumerator
18372 && parent_die != NULL
18373 && parent_die->die_parent == NULL
18374 && parent_die->tag == DW_TAG_enumeration_type
18375 && parent_die->has_specification == 0)
18377 if (part_die->name == NULL)
18378 complaint (&symfile_complaints,
18379 _("malformed enumerator DIE ignored"));
18380 else if (building_psymtab)
18381 add_psymbol_to_list (part_die->name, strlen (part_die->name), 0,
18382 VAR_DOMAIN, LOC_CONST,
18383 cu->language == language_cplus
18384 ? &objfile->global_psymbols
18385 : &objfile->static_psymbols,
18386 0, cu->language, objfile);
18388 info_ptr = locate_pdi_sibling (reader, part_die, info_ptr);
18392 /* We'll save this DIE so link it in. */
18393 part_die->die_parent = parent_die;
18394 part_die->die_sibling = NULL;
18395 part_die->die_child = NULL;
18397 if (last_die && last_die == parent_die)
18398 last_die->die_child = part_die;
18400 last_die->die_sibling = part_die;
18402 last_die = part_die;
18404 if (first_die == NULL)
18405 first_die = part_die;
18407 /* Maybe add the DIE to the hash table. Not all DIEs that we
18408 find interesting need to be in the hash table, because we
18409 also have the parent/sibling/child chains; only those that we
18410 might refer to by offset later during partial symbol reading.
18412 For now this means things that might have be the target of a
18413 DW_AT_specification, DW_AT_abstract_origin, or
18414 DW_AT_extension. DW_AT_extension will refer only to
18415 namespaces; DW_AT_abstract_origin refers to functions (and
18416 many things under the function DIE, but we do not recurse
18417 into function DIEs during partial symbol reading) and
18418 possibly variables as well; DW_AT_specification refers to
18419 declarations. Declarations ought to have the DW_AT_declaration
18420 flag. It happens that GCC forgets to put it in sometimes, but
18421 only for functions, not for types.
18423 Adding more things than necessary to the hash table is harmless
18424 except for the performance cost. Adding too few will result in
18425 wasted time in find_partial_die, when we reread the compilation
18426 unit with load_all_dies set. */
18429 || abbrev->tag == DW_TAG_constant
18430 || abbrev->tag == DW_TAG_subprogram
18431 || abbrev->tag == DW_TAG_variable
18432 || abbrev->tag == DW_TAG_namespace
18433 || part_die->is_declaration)
18437 slot = htab_find_slot_with_hash (cu->partial_dies, part_die,
18438 to_underlying (part_die->sect_off),
18443 part_die = XOBNEW (&cu->comp_unit_obstack, struct partial_die_info);
18445 /* For some DIEs we want to follow their children (if any). For C
18446 we have no reason to follow the children of structures; for other
18447 languages we have to, so that we can get at method physnames
18448 to infer fully qualified class names, for DW_AT_specification,
18449 and for C++ template arguments. For C++, we also look one level
18450 inside functions to find template arguments (if the name of the
18451 function does not already contain the template arguments).
18453 For Ada, we need to scan the children of subprograms and lexical
18454 blocks as well because Ada allows the definition of nested
18455 entities that could be interesting for the debugger, such as
18456 nested subprograms for instance. */
18457 if (last_die->has_children
18459 || last_die->tag == DW_TAG_namespace
18460 || last_die->tag == DW_TAG_module
18461 || last_die->tag == DW_TAG_enumeration_type
18462 || (cu->language == language_cplus
18463 && last_die->tag == DW_TAG_subprogram
18464 && (last_die->name == NULL
18465 || strchr (last_die->name, '<') == NULL))
18466 || (cu->language != language_c
18467 && (last_die->tag == DW_TAG_class_type
18468 || last_die->tag == DW_TAG_interface_type
18469 || last_die->tag == DW_TAG_structure_type
18470 || last_die->tag == DW_TAG_union_type))
18471 || (cu->language == language_ada
18472 && (last_die->tag == DW_TAG_subprogram
18473 || last_die->tag == DW_TAG_lexical_block))))
18476 parent_die = last_die;
18480 /* Otherwise we skip to the next sibling, if any. */
18481 info_ptr = locate_pdi_sibling (reader, last_die, info_ptr);
18483 /* Back to the top, do it again. */
18487 /* Read a minimal amount of information into the minimal die structure. */
18489 static const gdb_byte *
18490 read_partial_die (const struct die_reader_specs *reader,
18491 struct partial_die_info *part_die,
18492 struct abbrev_info *abbrev, unsigned int abbrev_len,
18493 const gdb_byte *info_ptr)
18495 struct dwarf2_cu *cu = reader->cu;
18496 struct dwarf2_per_objfile *dwarf2_per_objfile
18497 = cu->per_cu->dwarf2_per_objfile;
18498 struct objfile *objfile = dwarf2_per_objfile->objfile;
18499 const gdb_byte *buffer = reader->buffer;
18501 struct attribute attr;
18502 int has_low_pc_attr = 0;
18503 int has_high_pc_attr = 0;
18504 int high_pc_relative = 0;
18506 memset (part_die, 0, sizeof (struct partial_die_info));
18508 part_die->sect_off = (sect_offset) (info_ptr - buffer);
18510 info_ptr += abbrev_len;
18512 if (abbrev == NULL)
18515 part_die->tag = abbrev->tag;
18516 part_die->has_children = abbrev->has_children;
18518 for (i = 0; i < abbrev->num_attrs; ++i)
18520 info_ptr = read_attribute (reader, &attr, &abbrev->attrs[i], info_ptr);
18522 /* Store the data if it is of an attribute we want to keep in a
18523 partial symbol table. */
18527 switch (part_die->tag)
18529 case DW_TAG_compile_unit:
18530 case DW_TAG_partial_unit:
18531 case DW_TAG_type_unit:
18532 /* Compilation units have a DW_AT_name that is a filename, not
18533 a source language identifier. */
18534 case DW_TAG_enumeration_type:
18535 case DW_TAG_enumerator:
18536 /* These tags always have simple identifiers already; no need
18537 to canonicalize them. */
18538 part_die->name = DW_STRING (&attr);
18542 = dwarf2_canonicalize_name (DW_STRING (&attr), cu,
18543 &objfile->per_bfd->storage_obstack);
18547 case DW_AT_linkage_name:
18548 case DW_AT_MIPS_linkage_name:
18549 /* Note that both forms of linkage name might appear. We
18550 assume they will be the same, and we only store the last
18552 if (cu->language == language_ada)
18553 part_die->name = DW_STRING (&attr);
18554 part_die->linkage_name = DW_STRING (&attr);
18557 has_low_pc_attr = 1;
18558 part_die->lowpc = attr_value_as_address (&attr);
18560 case DW_AT_high_pc:
18561 has_high_pc_attr = 1;
18562 part_die->highpc = attr_value_as_address (&attr);
18563 if (cu->header.version >= 4 && attr_form_is_constant (&attr))
18564 high_pc_relative = 1;
18566 case DW_AT_location:
18567 /* Support the .debug_loc offsets. */
18568 if (attr_form_is_block (&attr))
18570 part_die->d.locdesc = DW_BLOCK (&attr);
18572 else if (attr_form_is_section_offset (&attr))
18574 dwarf2_complex_location_expr_complaint ();
18578 dwarf2_invalid_attrib_class_complaint ("DW_AT_location",
18579 "partial symbol information");
18582 case DW_AT_external:
18583 part_die->is_external = DW_UNSND (&attr);
18585 case DW_AT_declaration:
18586 part_die->is_declaration = DW_UNSND (&attr);
18589 part_die->has_type = 1;
18591 case DW_AT_abstract_origin:
18592 case DW_AT_specification:
18593 case DW_AT_extension:
18594 part_die->has_specification = 1;
18595 part_die->spec_offset = dwarf2_get_ref_die_offset (&attr);
18596 part_die->spec_is_dwz = (attr.form == DW_FORM_GNU_ref_alt
18597 || cu->per_cu->is_dwz);
18599 case DW_AT_sibling:
18600 /* Ignore absolute siblings, they might point outside of
18601 the current compile unit. */
18602 if (attr.form == DW_FORM_ref_addr)
18603 complaint (&symfile_complaints,
18604 _("ignoring absolute DW_AT_sibling"));
18607 sect_offset off = dwarf2_get_ref_die_offset (&attr);
18608 const gdb_byte *sibling_ptr = buffer + to_underlying (off);
18610 if (sibling_ptr < info_ptr)
18611 complaint (&symfile_complaints,
18612 _("DW_AT_sibling points backwards"));
18613 else if (sibling_ptr > reader->buffer_end)
18614 dwarf2_section_buffer_overflow_complaint (reader->die_section);
18616 part_die->sibling = sibling_ptr;
18619 case DW_AT_byte_size:
18620 part_die->has_byte_size = 1;
18622 case DW_AT_const_value:
18623 part_die->has_const_value = 1;
18625 case DW_AT_calling_convention:
18626 /* DWARF doesn't provide a way to identify a program's source-level
18627 entry point. DW_AT_calling_convention attributes are only meant
18628 to describe functions' calling conventions.
18630 However, because it's a necessary piece of information in
18631 Fortran, and before DWARF 4 DW_CC_program was the only
18632 piece of debugging information whose definition refers to
18633 a 'main program' at all, several compilers marked Fortran
18634 main programs with DW_CC_program --- even when those
18635 functions use the standard calling conventions.
18637 Although DWARF now specifies a way to provide this
18638 information, we support this practice for backward
18640 if (DW_UNSND (&attr) == DW_CC_program
18641 && cu->language == language_fortran)
18642 part_die->main_subprogram = 1;
18645 if (DW_UNSND (&attr) == DW_INL_inlined
18646 || DW_UNSND (&attr) == DW_INL_declared_inlined)
18647 part_die->may_be_inlined = 1;
18651 if (part_die->tag == DW_TAG_imported_unit)
18653 part_die->d.sect_off = dwarf2_get_ref_die_offset (&attr);
18654 part_die->is_dwz = (attr.form == DW_FORM_GNU_ref_alt
18655 || cu->per_cu->is_dwz);
18659 case DW_AT_main_subprogram:
18660 part_die->main_subprogram = DW_UNSND (&attr);
18668 if (high_pc_relative)
18669 part_die->highpc += part_die->lowpc;
18671 if (has_low_pc_attr && has_high_pc_attr)
18673 /* When using the GNU linker, .gnu.linkonce. sections are used to
18674 eliminate duplicate copies of functions and vtables and such.
18675 The linker will arbitrarily choose one and discard the others.
18676 The AT_*_pc values for such functions refer to local labels in
18677 these sections. If the section from that file was discarded, the
18678 labels are not in the output, so the relocs get a value of 0.
18679 If this is a discarded function, mark the pc bounds as invalid,
18680 so that GDB will ignore it. */
18681 if (part_die->lowpc == 0 && !dwarf2_per_objfile->has_section_at_zero)
18683 struct gdbarch *gdbarch = get_objfile_arch (objfile);
18685 complaint (&symfile_complaints,
18686 _("DW_AT_low_pc %s is zero "
18687 "for DIE at 0x%x [in module %s]"),
18688 paddress (gdbarch, part_die->lowpc),
18689 to_underlying (part_die->sect_off), objfile_name (objfile));
18691 /* dwarf2_get_pc_bounds has also the strict low < high requirement. */
18692 else if (part_die->lowpc >= part_die->highpc)
18694 struct gdbarch *gdbarch = get_objfile_arch (objfile);
18696 complaint (&symfile_complaints,
18697 _("DW_AT_low_pc %s is not < DW_AT_high_pc %s "
18698 "for DIE at 0x%x [in module %s]"),
18699 paddress (gdbarch, part_die->lowpc),
18700 paddress (gdbarch, part_die->highpc),
18701 to_underlying (part_die->sect_off),
18702 objfile_name (objfile));
18705 part_die->has_pc_info = 1;
18711 /* Find a cached partial DIE at OFFSET in CU. */
18713 static struct partial_die_info *
18714 find_partial_die_in_comp_unit (sect_offset sect_off, struct dwarf2_cu *cu)
18716 struct partial_die_info *lookup_die = NULL;
18717 struct partial_die_info part_die;
18719 part_die.sect_off = sect_off;
18720 lookup_die = ((struct partial_die_info *)
18721 htab_find_with_hash (cu->partial_dies, &part_die,
18722 to_underlying (sect_off)));
18727 /* Find a partial DIE at OFFSET, which may or may not be in CU,
18728 except in the case of .debug_types DIEs which do not reference
18729 outside their CU (they do however referencing other types via
18730 DW_FORM_ref_sig8). */
18732 static struct partial_die_info *
18733 find_partial_die (sect_offset sect_off, int offset_in_dwz, struct dwarf2_cu *cu)
18735 struct dwarf2_per_objfile *dwarf2_per_objfile
18736 = cu->per_cu->dwarf2_per_objfile;
18737 struct objfile *objfile = dwarf2_per_objfile->objfile;
18738 struct dwarf2_per_cu_data *per_cu = NULL;
18739 struct partial_die_info *pd = NULL;
18741 if (offset_in_dwz == cu->per_cu->is_dwz
18742 && offset_in_cu_p (&cu->header, sect_off))
18744 pd = find_partial_die_in_comp_unit (sect_off, cu);
18747 /* We missed recording what we needed.
18748 Load all dies and try again. */
18749 per_cu = cu->per_cu;
18753 /* TUs don't reference other CUs/TUs (except via type signatures). */
18754 if (cu->per_cu->is_debug_types)
18756 error (_("Dwarf Error: Type Unit at offset 0x%x contains"
18757 " external reference to offset 0x%x [in module %s].\n"),
18758 to_underlying (cu->header.sect_off), to_underlying (sect_off),
18759 bfd_get_filename (objfile->obfd));
18761 per_cu = dwarf2_find_containing_comp_unit (sect_off, offset_in_dwz,
18762 dwarf2_per_objfile);
18764 if (per_cu->cu == NULL || per_cu->cu->partial_dies == NULL)
18765 load_partial_comp_unit (per_cu);
18767 per_cu->cu->last_used = 0;
18768 pd = find_partial_die_in_comp_unit (sect_off, per_cu->cu);
18771 /* If we didn't find it, and not all dies have been loaded,
18772 load them all and try again. */
18774 if (pd == NULL && per_cu->load_all_dies == 0)
18776 per_cu->load_all_dies = 1;
18778 /* This is nasty. When we reread the DIEs, somewhere up the call chain
18779 THIS_CU->cu may already be in use. So we can't just free it and
18780 replace its DIEs with the ones we read in. Instead, we leave those
18781 DIEs alone (which can still be in use, e.g. in scan_partial_symbols),
18782 and clobber THIS_CU->cu->partial_dies with the hash table for the new
18784 load_partial_comp_unit (per_cu);
18786 pd = find_partial_die_in_comp_unit (sect_off, per_cu->cu);
18790 internal_error (__FILE__, __LINE__,
18791 _("could not find partial DIE 0x%x "
18792 "in cache [from module %s]\n"),
18793 to_underlying (sect_off), bfd_get_filename (objfile->obfd));
18797 /* See if we can figure out if the class lives in a namespace. We do
18798 this by looking for a member function; its demangled name will
18799 contain namespace info, if there is any. */
18802 guess_partial_die_structure_name (struct partial_die_info *struct_pdi,
18803 struct dwarf2_cu *cu)
18805 /* NOTE: carlton/2003-10-07: Getting the info this way changes
18806 what template types look like, because the demangler
18807 frequently doesn't give the same name as the debug info. We
18808 could fix this by only using the demangled name to get the
18809 prefix (but see comment in read_structure_type). */
18811 struct partial_die_info *real_pdi;
18812 struct partial_die_info *child_pdi;
18814 /* If this DIE (this DIE's specification, if any) has a parent, then
18815 we should not do this. We'll prepend the parent's fully qualified
18816 name when we create the partial symbol. */
18818 real_pdi = struct_pdi;
18819 while (real_pdi->has_specification)
18820 real_pdi = find_partial_die (real_pdi->spec_offset,
18821 real_pdi->spec_is_dwz, cu);
18823 if (real_pdi->die_parent != NULL)
18826 for (child_pdi = struct_pdi->die_child;
18828 child_pdi = child_pdi->die_sibling)
18830 if (child_pdi->tag == DW_TAG_subprogram
18831 && child_pdi->linkage_name != NULL)
18833 char *actual_class_name
18834 = language_class_name_from_physname (cu->language_defn,
18835 child_pdi->linkage_name);
18836 if (actual_class_name != NULL)
18838 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
18841 obstack_copy0 (&objfile->per_bfd->storage_obstack,
18843 strlen (actual_class_name)));
18844 xfree (actual_class_name);
18851 /* Adjust PART_DIE before generating a symbol for it. This function
18852 may set the is_external flag or change the DIE's name. */
18855 fixup_partial_die (struct partial_die_info *part_die,
18856 struct dwarf2_cu *cu)
18858 /* Once we've fixed up a die, there's no point in doing so again.
18859 This also avoids a memory leak if we were to call
18860 guess_partial_die_structure_name multiple times. */
18861 if (part_die->fixup_called)
18864 /* If we found a reference attribute and the DIE has no name, try
18865 to find a name in the referred to DIE. */
18867 if (part_die->name == NULL && part_die->has_specification)
18869 struct partial_die_info *spec_die;
18871 spec_die = find_partial_die (part_die->spec_offset,
18872 part_die->spec_is_dwz, cu);
18874 fixup_partial_die (spec_die, cu);
18876 if (spec_die->name)
18878 part_die->name = spec_die->name;
18880 /* Copy DW_AT_external attribute if it is set. */
18881 if (spec_die->is_external)
18882 part_die->is_external = spec_die->is_external;
18886 /* Set default names for some unnamed DIEs. */
18888 if (part_die->name == NULL && part_die->tag == DW_TAG_namespace)
18889 part_die->name = CP_ANONYMOUS_NAMESPACE_STR;
18891 /* If there is no parent die to provide a namespace, and there are
18892 children, see if we can determine the namespace from their linkage
18894 if (cu->language == language_cplus
18895 && !VEC_empty (dwarf2_section_info_def,
18896 cu->per_cu->dwarf2_per_objfile->types)
18897 && part_die->die_parent == NULL
18898 && part_die->has_children
18899 && (part_die->tag == DW_TAG_class_type
18900 || part_die->tag == DW_TAG_structure_type
18901 || part_die->tag == DW_TAG_union_type))
18902 guess_partial_die_structure_name (part_die, cu);
18904 /* GCC might emit a nameless struct or union that has a linkage
18905 name. See http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47510. */
18906 if (part_die->name == NULL
18907 && (part_die->tag == DW_TAG_class_type
18908 || part_die->tag == DW_TAG_interface_type
18909 || part_die->tag == DW_TAG_structure_type
18910 || part_die->tag == DW_TAG_union_type)
18911 && part_die->linkage_name != NULL)
18915 demangled = gdb_demangle (part_die->linkage_name, DMGL_TYPES);
18920 /* Strip any leading namespaces/classes, keep only the base name.
18921 DW_AT_name for named DIEs does not contain the prefixes. */
18922 base = strrchr (demangled, ':');
18923 if (base && base > demangled && base[-1] == ':')
18928 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
18931 obstack_copy0 (&objfile->per_bfd->storage_obstack,
18932 base, strlen (base)));
18937 part_die->fixup_called = 1;
18940 /* Read an attribute value described by an attribute form. */
18942 static const gdb_byte *
18943 read_attribute_value (const struct die_reader_specs *reader,
18944 struct attribute *attr, unsigned form,
18945 LONGEST implicit_const, const gdb_byte *info_ptr)
18947 struct dwarf2_cu *cu = reader->cu;
18948 struct dwarf2_per_objfile *dwarf2_per_objfile
18949 = cu->per_cu->dwarf2_per_objfile;
18950 struct objfile *objfile = dwarf2_per_objfile->objfile;
18951 struct gdbarch *gdbarch = get_objfile_arch (objfile);
18952 bfd *abfd = reader->abfd;
18953 struct comp_unit_head *cu_header = &cu->header;
18954 unsigned int bytes_read;
18955 struct dwarf_block *blk;
18957 attr->form = (enum dwarf_form) form;
18960 case DW_FORM_ref_addr:
18961 if (cu->header.version == 2)
18962 DW_UNSND (attr) = read_address (abfd, info_ptr, cu, &bytes_read);
18964 DW_UNSND (attr) = read_offset (abfd, info_ptr,
18965 &cu->header, &bytes_read);
18966 info_ptr += bytes_read;
18968 case DW_FORM_GNU_ref_alt:
18969 DW_UNSND (attr) = read_offset (abfd, info_ptr, &cu->header, &bytes_read);
18970 info_ptr += bytes_read;
18973 DW_ADDR (attr) = read_address (abfd, info_ptr, cu, &bytes_read);
18974 DW_ADDR (attr) = gdbarch_adjust_dwarf2_addr (gdbarch, DW_ADDR (attr));
18975 info_ptr += bytes_read;
18977 case DW_FORM_block2:
18978 blk = dwarf_alloc_block (cu);
18979 blk->size = read_2_bytes (abfd, info_ptr);
18981 blk->data = read_n_bytes (abfd, info_ptr, blk->size);
18982 info_ptr += blk->size;
18983 DW_BLOCK (attr) = blk;
18985 case DW_FORM_block4:
18986 blk = dwarf_alloc_block (cu);
18987 blk->size = read_4_bytes (abfd, info_ptr);
18989 blk->data = read_n_bytes (abfd, info_ptr, blk->size);
18990 info_ptr += blk->size;
18991 DW_BLOCK (attr) = blk;
18993 case DW_FORM_data2:
18994 DW_UNSND (attr) = read_2_bytes (abfd, info_ptr);
18997 case DW_FORM_data4:
18998 DW_UNSND (attr) = read_4_bytes (abfd, info_ptr);
19001 case DW_FORM_data8:
19002 DW_UNSND (attr) = read_8_bytes (abfd, info_ptr);
19005 case DW_FORM_data16:
19006 blk = dwarf_alloc_block (cu);
19008 blk->data = read_n_bytes (abfd, info_ptr, 16);
19010 DW_BLOCK (attr) = blk;
19012 case DW_FORM_sec_offset:
19013 DW_UNSND (attr) = read_offset (abfd, info_ptr, &cu->header, &bytes_read);
19014 info_ptr += bytes_read;
19016 case DW_FORM_string:
19017 DW_STRING (attr) = read_direct_string (abfd, info_ptr, &bytes_read);
19018 DW_STRING_IS_CANONICAL (attr) = 0;
19019 info_ptr += bytes_read;
19022 if (!cu->per_cu->is_dwz)
19024 DW_STRING (attr) = read_indirect_string (dwarf2_per_objfile,
19025 abfd, info_ptr, cu_header,
19027 DW_STRING_IS_CANONICAL (attr) = 0;
19028 info_ptr += bytes_read;
19032 case DW_FORM_line_strp:
19033 if (!cu->per_cu->is_dwz)
19035 DW_STRING (attr) = read_indirect_line_string (dwarf2_per_objfile,
19037 cu_header, &bytes_read);
19038 DW_STRING_IS_CANONICAL (attr) = 0;
19039 info_ptr += bytes_read;
19043 case DW_FORM_GNU_strp_alt:
19045 struct dwz_file *dwz = dwarf2_get_dwz_file (dwarf2_per_objfile);
19046 LONGEST str_offset = read_offset (abfd, info_ptr, cu_header,
19049 DW_STRING (attr) = read_indirect_string_from_dwz (objfile,
19051 DW_STRING_IS_CANONICAL (attr) = 0;
19052 info_ptr += bytes_read;
19055 case DW_FORM_exprloc:
19056 case DW_FORM_block:
19057 blk = dwarf_alloc_block (cu);
19058 blk->size = read_unsigned_leb128 (abfd, info_ptr, &bytes_read);
19059 info_ptr += bytes_read;
19060 blk->data = read_n_bytes (abfd, info_ptr, blk->size);
19061 info_ptr += blk->size;
19062 DW_BLOCK (attr) = blk;
19064 case DW_FORM_block1:
19065 blk = dwarf_alloc_block (cu);
19066 blk->size = read_1_byte (abfd, info_ptr);
19068 blk->data = read_n_bytes (abfd, info_ptr, blk->size);
19069 info_ptr += blk->size;
19070 DW_BLOCK (attr) = blk;
19072 case DW_FORM_data1:
19073 DW_UNSND (attr) = read_1_byte (abfd, info_ptr);
19077 DW_UNSND (attr) = read_1_byte (abfd, info_ptr);
19080 case DW_FORM_flag_present:
19081 DW_UNSND (attr) = 1;
19083 case DW_FORM_sdata:
19084 DW_SND (attr) = read_signed_leb128 (abfd, info_ptr, &bytes_read);
19085 info_ptr += bytes_read;
19087 case DW_FORM_udata:
19088 DW_UNSND (attr) = read_unsigned_leb128 (abfd, info_ptr, &bytes_read);
19089 info_ptr += bytes_read;
19092 DW_UNSND (attr) = (to_underlying (cu->header.sect_off)
19093 + read_1_byte (abfd, info_ptr));
19097 DW_UNSND (attr) = (to_underlying (cu->header.sect_off)
19098 + read_2_bytes (abfd, info_ptr));
19102 DW_UNSND (attr) = (to_underlying (cu->header.sect_off)
19103 + read_4_bytes (abfd, info_ptr));
19107 DW_UNSND (attr) = (to_underlying (cu->header.sect_off)
19108 + read_8_bytes (abfd, info_ptr));
19111 case DW_FORM_ref_sig8:
19112 DW_SIGNATURE (attr) = read_8_bytes (abfd, info_ptr);
19115 case DW_FORM_ref_udata:
19116 DW_UNSND (attr) = (to_underlying (cu->header.sect_off)
19117 + read_unsigned_leb128 (abfd, info_ptr, &bytes_read));
19118 info_ptr += bytes_read;
19120 case DW_FORM_indirect:
19121 form = read_unsigned_leb128 (abfd, info_ptr, &bytes_read);
19122 info_ptr += bytes_read;
19123 if (form == DW_FORM_implicit_const)
19125 implicit_const = read_signed_leb128 (abfd, info_ptr, &bytes_read);
19126 info_ptr += bytes_read;
19128 info_ptr = read_attribute_value (reader, attr, form, implicit_const,
19131 case DW_FORM_implicit_const:
19132 DW_SND (attr) = implicit_const;
19134 case DW_FORM_GNU_addr_index:
19135 if (reader->dwo_file == NULL)
19137 /* For now flag a hard error.
19138 Later we can turn this into a complaint. */
19139 error (_("Dwarf Error: %s found in non-DWO CU [in module %s]"),
19140 dwarf_form_name (form),
19141 bfd_get_filename (abfd));
19143 DW_ADDR (attr) = read_addr_index_from_leb128 (cu, info_ptr, &bytes_read);
19144 info_ptr += bytes_read;
19146 case DW_FORM_GNU_str_index:
19147 if (reader->dwo_file == NULL)
19149 /* For now flag a hard error.
19150 Later we can turn this into a complaint if warranted. */
19151 error (_("Dwarf Error: %s found in non-DWO CU [in module %s]"),
19152 dwarf_form_name (form),
19153 bfd_get_filename (abfd));
19156 ULONGEST str_index =
19157 read_unsigned_leb128 (abfd, info_ptr, &bytes_read);
19159 DW_STRING (attr) = read_str_index (reader, str_index);
19160 DW_STRING_IS_CANONICAL (attr) = 0;
19161 info_ptr += bytes_read;
19165 error (_("Dwarf Error: Cannot handle %s in DWARF reader [in module %s]"),
19166 dwarf_form_name (form),
19167 bfd_get_filename (abfd));
19171 if (cu->per_cu->is_dwz && attr_form_is_ref (attr))
19172 attr->form = DW_FORM_GNU_ref_alt;
19174 /* We have seen instances where the compiler tried to emit a byte
19175 size attribute of -1 which ended up being encoded as an unsigned
19176 0xffffffff. Although 0xffffffff is technically a valid size value,
19177 an object of this size seems pretty unlikely so we can relatively
19178 safely treat these cases as if the size attribute was invalid and
19179 treat them as zero by default. */
19180 if (attr->name == DW_AT_byte_size
19181 && form == DW_FORM_data4
19182 && DW_UNSND (attr) >= 0xffffffff)
19185 (&symfile_complaints,
19186 _("Suspicious DW_AT_byte_size value treated as zero instead of %s"),
19187 hex_string (DW_UNSND (attr)));
19188 DW_UNSND (attr) = 0;
19194 /* Read an attribute described by an abbreviated attribute. */
19196 static const gdb_byte *
19197 read_attribute (const struct die_reader_specs *reader,
19198 struct attribute *attr, struct attr_abbrev *abbrev,
19199 const gdb_byte *info_ptr)
19201 attr->name = abbrev->name;
19202 return read_attribute_value (reader, attr, abbrev->form,
19203 abbrev->implicit_const, info_ptr);
19206 /* Read dwarf information from a buffer. */
19208 static unsigned int
19209 read_1_byte (bfd *abfd, const gdb_byte *buf)
19211 return bfd_get_8 (abfd, buf);
19215 read_1_signed_byte (bfd *abfd, const gdb_byte *buf)
19217 return bfd_get_signed_8 (abfd, buf);
19220 static unsigned int
19221 read_2_bytes (bfd *abfd, const gdb_byte *buf)
19223 return bfd_get_16 (abfd, buf);
19227 read_2_signed_bytes (bfd *abfd, const gdb_byte *buf)
19229 return bfd_get_signed_16 (abfd, buf);
19232 static unsigned int
19233 read_4_bytes (bfd *abfd, const gdb_byte *buf)
19235 return bfd_get_32 (abfd, buf);
19239 read_4_signed_bytes (bfd *abfd, const gdb_byte *buf)
19241 return bfd_get_signed_32 (abfd, buf);
19245 read_8_bytes (bfd *abfd, const gdb_byte *buf)
19247 return bfd_get_64 (abfd, buf);
19251 read_address (bfd *abfd, const gdb_byte *buf, struct dwarf2_cu *cu,
19252 unsigned int *bytes_read)
19254 struct comp_unit_head *cu_header = &cu->header;
19255 CORE_ADDR retval = 0;
19257 if (cu_header->signed_addr_p)
19259 switch (cu_header->addr_size)
19262 retval = bfd_get_signed_16 (abfd, buf);
19265 retval = bfd_get_signed_32 (abfd, buf);
19268 retval = bfd_get_signed_64 (abfd, buf);
19271 internal_error (__FILE__, __LINE__,
19272 _("read_address: bad switch, signed [in module %s]"),
19273 bfd_get_filename (abfd));
19278 switch (cu_header->addr_size)
19281 retval = bfd_get_16 (abfd, buf);
19284 retval = bfd_get_32 (abfd, buf);
19287 retval = bfd_get_64 (abfd, buf);
19290 internal_error (__FILE__, __LINE__,
19291 _("read_address: bad switch, "
19292 "unsigned [in module %s]"),
19293 bfd_get_filename (abfd));
19297 *bytes_read = cu_header->addr_size;
19301 /* Read the initial length from a section. The (draft) DWARF 3
19302 specification allows the initial length to take up either 4 bytes
19303 or 12 bytes. If the first 4 bytes are 0xffffffff, then the next 8
19304 bytes describe the length and all offsets will be 8 bytes in length
19307 An older, non-standard 64-bit format is also handled by this
19308 function. The older format in question stores the initial length
19309 as an 8-byte quantity without an escape value. Lengths greater
19310 than 2^32 aren't very common which means that the initial 4 bytes
19311 is almost always zero. Since a length value of zero doesn't make
19312 sense for the 32-bit format, this initial zero can be considered to
19313 be an escape value which indicates the presence of the older 64-bit
19314 format. As written, the code can't detect (old format) lengths
19315 greater than 4GB. If it becomes necessary to handle lengths
19316 somewhat larger than 4GB, we could allow other small values (such
19317 as the non-sensical values of 1, 2, and 3) to also be used as
19318 escape values indicating the presence of the old format.
19320 The value returned via bytes_read should be used to increment the
19321 relevant pointer after calling read_initial_length().
19323 [ Note: read_initial_length() and read_offset() are based on the
19324 document entitled "DWARF Debugging Information Format", revision
19325 3, draft 8, dated November 19, 2001. This document was obtained
19328 http://reality.sgiweb.org/davea/dwarf3-draft8-011125.pdf
19330 This document is only a draft and is subject to change. (So beware.)
19332 Details regarding the older, non-standard 64-bit format were
19333 determined empirically by examining 64-bit ELF files produced by
19334 the SGI toolchain on an IRIX 6.5 machine.
19336 - Kevin, July 16, 2002
19340 read_initial_length (bfd *abfd, const gdb_byte *buf, unsigned int *bytes_read)
19342 LONGEST length = bfd_get_32 (abfd, buf);
19344 if (length == 0xffffffff)
19346 length = bfd_get_64 (abfd, buf + 4);
19349 else if (length == 0)
19351 /* Handle the (non-standard) 64-bit DWARF2 format used by IRIX. */
19352 length = bfd_get_64 (abfd, buf);
19363 /* Cover function for read_initial_length.
19364 Returns the length of the object at BUF, and stores the size of the
19365 initial length in *BYTES_READ and stores the size that offsets will be in
19367 If the initial length size is not equivalent to that specified in
19368 CU_HEADER then issue a complaint.
19369 This is useful when reading non-comp-unit headers. */
19372 read_checked_initial_length_and_offset (bfd *abfd, const gdb_byte *buf,
19373 const struct comp_unit_head *cu_header,
19374 unsigned int *bytes_read,
19375 unsigned int *offset_size)
19377 LONGEST length = read_initial_length (abfd, buf, bytes_read);
19379 gdb_assert (cu_header->initial_length_size == 4
19380 || cu_header->initial_length_size == 8
19381 || cu_header->initial_length_size == 12);
19383 if (cu_header->initial_length_size != *bytes_read)
19384 complaint (&symfile_complaints,
19385 _("intermixed 32-bit and 64-bit DWARF sections"));
19387 *offset_size = (*bytes_read == 4) ? 4 : 8;
19391 /* Read an offset from the data stream. The size of the offset is
19392 given by cu_header->offset_size. */
19395 read_offset (bfd *abfd, const gdb_byte *buf,
19396 const struct comp_unit_head *cu_header,
19397 unsigned int *bytes_read)
19399 LONGEST offset = read_offset_1 (abfd, buf, cu_header->offset_size);
19401 *bytes_read = cu_header->offset_size;
19405 /* Read an offset from the data stream. */
19408 read_offset_1 (bfd *abfd, const gdb_byte *buf, unsigned int offset_size)
19410 LONGEST retval = 0;
19412 switch (offset_size)
19415 retval = bfd_get_32 (abfd, buf);
19418 retval = bfd_get_64 (abfd, buf);
19421 internal_error (__FILE__, __LINE__,
19422 _("read_offset_1: bad switch [in module %s]"),
19423 bfd_get_filename (abfd));
19429 static const gdb_byte *
19430 read_n_bytes (bfd *abfd, const gdb_byte *buf, unsigned int size)
19432 /* If the size of a host char is 8 bits, we can return a pointer
19433 to the buffer, otherwise we have to copy the data to a buffer
19434 allocated on the temporary obstack. */
19435 gdb_assert (HOST_CHAR_BIT == 8);
19439 static const char *
19440 read_direct_string (bfd *abfd, const gdb_byte *buf,
19441 unsigned int *bytes_read_ptr)
19443 /* If the size of a host char is 8 bits, we can return a pointer
19444 to the string, otherwise we have to copy the string to a buffer
19445 allocated on the temporary obstack. */
19446 gdb_assert (HOST_CHAR_BIT == 8);
19449 *bytes_read_ptr = 1;
19452 *bytes_read_ptr = strlen ((const char *) buf) + 1;
19453 return (const char *) buf;
19456 /* Return pointer to string at section SECT offset STR_OFFSET with error
19457 reporting strings FORM_NAME and SECT_NAME. */
19459 static const char *
19460 read_indirect_string_at_offset_from (struct objfile *objfile,
19461 bfd *abfd, LONGEST str_offset,
19462 struct dwarf2_section_info *sect,
19463 const char *form_name,
19464 const char *sect_name)
19466 dwarf2_read_section (objfile, sect);
19467 if (sect->buffer == NULL)
19468 error (_("%s used without %s section [in module %s]"),
19469 form_name, sect_name, bfd_get_filename (abfd));
19470 if (str_offset >= sect->size)
19471 error (_("%s pointing outside of %s section [in module %s]"),
19472 form_name, sect_name, bfd_get_filename (abfd));
19473 gdb_assert (HOST_CHAR_BIT == 8);
19474 if (sect->buffer[str_offset] == '\0')
19476 return (const char *) (sect->buffer + str_offset);
19479 /* Return pointer to string at .debug_str offset STR_OFFSET. */
19481 static const char *
19482 read_indirect_string_at_offset (struct dwarf2_per_objfile *dwarf2_per_objfile,
19483 bfd *abfd, LONGEST str_offset)
19485 return read_indirect_string_at_offset_from (dwarf2_per_objfile->objfile,
19487 &dwarf2_per_objfile->str,
19488 "DW_FORM_strp", ".debug_str");
19491 /* Return pointer to string at .debug_line_str offset STR_OFFSET. */
19493 static const char *
19494 read_indirect_line_string_at_offset (struct dwarf2_per_objfile *dwarf2_per_objfile,
19495 bfd *abfd, LONGEST str_offset)
19497 return read_indirect_string_at_offset_from (dwarf2_per_objfile->objfile,
19499 &dwarf2_per_objfile->line_str,
19500 "DW_FORM_line_strp",
19501 ".debug_line_str");
19504 /* Read a string at offset STR_OFFSET in the .debug_str section from
19505 the .dwz file DWZ. Throw an error if the offset is too large. If
19506 the string consists of a single NUL byte, return NULL; otherwise
19507 return a pointer to the string. */
19509 static const char *
19510 read_indirect_string_from_dwz (struct objfile *objfile, struct dwz_file *dwz,
19511 LONGEST str_offset)
19513 dwarf2_read_section (objfile, &dwz->str);
19515 if (dwz->str.buffer == NULL)
19516 error (_("DW_FORM_GNU_strp_alt used without .debug_str "
19517 "section [in module %s]"),
19518 bfd_get_filename (dwz->dwz_bfd));
19519 if (str_offset >= dwz->str.size)
19520 error (_("DW_FORM_GNU_strp_alt pointing outside of "
19521 ".debug_str section [in module %s]"),
19522 bfd_get_filename (dwz->dwz_bfd));
19523 gdb_assert (HOST_CHAR_BIT == 8);
19524 if (dwz->str.buffer[str_offset] == '\0')
19526 return (const char *) (dwz->str.buffer + str_offset);
19529 /* Return pointer to string at .debug_str offset as read from BUF.
19530 BUF is assumed to be in a compilation unit described by CU_HEADER.
19531 Return *BYTES_READ_PTR count of bytes read from BUF. */
19533 static const char *
19534 read_indirect_string (struct dwarf2_per_objfile *dwarf2_per_objfile, bfd *abfd,
19535 const gdb_byte *buf,
19536 const struct comp_unit_head *cu_header,
19537 unsigned int *bytes_read_ptr)
19539 LONGEST str_offset = read_offset (abfd, buf, cu_header, bytes_read_ptr);
19541 return read_indirect_string_at_offset (dwarf2_per_objfile, abfd, str_offset);
19544 /* Return pointer to string at .debug_line_str offset as read from BUF.
19545 BUF is assumed to be in a compilation unit described by CU_HEADER.
19546 Return *BYTES_READ_PTR count of bytes read from BUF. */
19548 static const char *
19549 read_indirect_line_string (struct dwarf2_per_objfile *dwarf2_per_objfile,
19550 bfd *abfd, const gdb_byte *buf,
19551 const struct comp_unit_head *cu_header,
19552 unsigned int *bytes_read_ptr)
19554 LONGEST str_offset = read_offset (abfd, buf, cu_header, bytes_read_ptr);
19556 return read_indirect_line_string_at_offset (dwarf2_per_objfile, abfd,
19561 read_unsigned_leb128 (bfd *abfd, const gdb_byte *buf,
19562 unsigned int *bytes_read_ptr)
19565 unsigned int num_read;
19567 unsigned char byte;
19574 byte = bfd_get_8 (abfd, buf);
19577 result |= ((ULONGEST) (byte & 127) << shift);
19578 if ((byte & 128) == 0)
19584 *bytes_read_ptr = num_read;
19589 read_signed_leb128 (bfd *abfd, const gdb_byte *buf,
19590 unsigned int *bytes_read_ptr)
19593 int shift, num_read;
19594 unsigned char byte;
19601 byte = bfd_get_8 (abfd, buf);
19604 result |= ((LONGEST) (byte & 127) << shift);
19606 if ((byte & 128) == 0)
19611 if ((shift < 8 * sizeof (result)) && (byte & 0x40))
19612 result |= -(((LONGEST) 1) << shift);
19613 *bytes_read_ptr = num_read;
19617 /* Given index ADDR_INDEX in .debug_addr, fetch the value.
19618 ADDR_BASE is the DW_AT_GNU_addr_base attribute or zero.
19619 ADDR_SIZE is the size of addresses from the CU header. */
19622 read_addr_index_1 (struct dwarf2_per_objfile *dwarf2_per_objfile,
19623 unsigned int addr_index, ULONGEST addr_base, int addr_size)
19625 struct objfile *objfile = dwarf2_per_objfile->objfile;
19626 bfd *abfd = objfile->obfd;
19627 const gdb_byte *info_ptr;
19629 dwarf2_read_section (objfile, &dwarf2_per_objfile->addr);
19630 if (dwarf2_per_objfile->addr.buffer == NULL)
19631 error (_("DW_FORM_addr_index used without .debug_addr section [in module %s]"),
19632 objfile_name (objfile));
19633 if (addr_base + addr_index * addr_size >= dwarf2_per_objfile->addr.size)
19634 error (_("DW_FORM_addr_index pointing outside of "
19635 ".debug_addr section [in module %s]"),
19636 objfile_name (objfile));
19637 info_ptr = (dwarf2_per_objfile->addr.buffer
19638 + addr_base + addr_index * addr_size);
19639 if (addr_size == 4)
19640 return bfd_get_32 (abfd, info_ptr);
19642 return bfd_get_64 (abfd, info_ptr);
19645 /* Given index ADDR_INDEX in .debug_addr, fetch the value. */
19648 read_addr_index (struct dwarf2_cu *cu, unsigned int addr_index)
19650 return read_addr_index_1 (cu->per_cu->dwarf2_per_objfile, addr_index,
19651 cu->addr_base, cu->header.addr_size);
19654 /* Given a pointer to an leb128 value, fetch the value from .debug_addr. */
19657 read_addr_index_from_leb128 (struct dwarf2_cu *cu, const gdb_byte *info_ptr,
19658 unsigned int *bytes_read)
19660 bfd *abfd = cu->per_cu->dwarf2_per_objfile->objfile->obfd;
19661 unsigned int addr_index = read_unsigned_leb128 (abfd, info_ptr, bytes_read);
19663 return read_addr_index (cu, addr_index);
19666 /* Data structure to pass results from dwarf2_read_addr_index_reader
19667 back to dwarf2_read_addr_index. */
19669 struct dwarf2_read_addr_index_data
19671 ULONGEST addr_base;
19675 /* die_reader_func for dwarf2_read_addr_index. */
19678 dwarf2_read_addr_index_reader (const struct die_reader_specs *reader,
19679 const gdb_byte *info_ptr,
19680 struct die_info *comp_unit_die,
19684 struct dwarf2_cu *cu = reader->cu;
19685 struct dwarf2_read_addr_index_data *aidata =
19686 (struct dwarf2_read_addr_index_data *) data;
19688 aidata->addr_base = cu->addr_base;
19689 aidata->addr_size = cu->header.addr_size;
19692 /* Given an index in .debug_addr, fetch the value.
19693 NOTE: This can be called during dwarf expression evaluation,
19694 long after the debug information has been read, and thus per_cu->cu
19695 may no longer exist. */
19698 dwarf2_read_addr_index (struct dwarf2_per_cu_data *per_cu,
19699 unsigned int addr_index)
19701 struct dwarf2_per_objfile *dwarf2_per_objfile = per_cu->dwarf2_per_objfile;
19702 struct objfile *objfile = dwarf2_per_objfile->objfile;
19703 struct dwarf2_cu *cu = per_cu->cu;
19704 ULONGEST addr_base;
19707 /* We need addr_base and addr_size.
19708 If we don't have PER_CU->cu, we have to get it.
19709 Nasty, but the alternative is storing the needed info in PER_CU,
19710 which at this point doesn't seem justified: it's not clear how frequently
19711 it would get used and it would increase the size of every PER_CU.
19712 Entry points like dwarf2_per_cu_addr_size do a similar thing
19713 so we're not in uncharted territory here.
19714 Alas we need to be a bit more complicated as addr_base is contained
19717 We don't need to read the entire CU(/TU).
19718 We just need the header and top level die.
19720 IWBN to use the aging mechanism to let us lazily later discard the CU.
19721 For now we skip this optimization. */
19725 addr_base = cu->addr_base;
19726 addr_size = cu->header.addr_size;
19730 struct dwarf2_read_addr_index_data aidata;
19732 /* Note: We can't use init_cutu_and_read_dies_simple here,
19733 we need addr_base. */
19734 init_cutu_and_read_dies (per_cu, NULL, 0, 0,
19735 dwarf2_read_addr_index_reader, &aidata);
19736 addr_base = aidata.addr_base;
19737 addr_size = aidata.addr_size;
19740 return read_addr_index_1 (dwarf2_per_objfile, addr_index, addr_base,
19744 /* Given a DW_FORM_GNU_str_index, fetch the string.
19745 This is only used by the Fission support. */
19747 static const char *
19748 read_str_index (const struct die_reader_specs *reader, ULONGEST str_index)
19750 struct dwarf2_cu *cu = reader->cu;
19751 struct dwarf2_per_objfile *dwarf2_per_objfile
19752 = cu->per_cu->dwarf2_per_objfile;
19753 struct objfile *objfile = dwarf2_per_objfile->objfile;
19754 const char *objf_name = objfile_name (objfile);
19755 bfd *abfd = objfile->obfd;
19756 struct dwarf2_section_info *str_section = &reader->dwo_file->sections.str;
19757 struct dwarf2_section_info *str_offsets_section =
19758 &reader->dwo_file->sections.str_offsets;
19759 const gdb_byte *info_ptr;
19760 ULONGEST str_offset;
19761 static const char form_name[] = "DW_FORM_GNU_str_index";
19763 dwarf2_read_section (objfile, str_section);
19764 dwarf2_read_section (objfile, str_offsets_section);
19765 if (str_section->buffer == NULL)
19766 error (_("%s used without .debug_str.dwo section"
19767 " in CU at offset 0x%x [in module %s]"),
19768 form_name, to_underlying (cu->header.sect_off), objf_name);
19769 if (str_offsets_section->buffer == NULL)
19770 error (_("%s used without .debug_str_offsets.dwo section"
19771 " in CU at offset 0x%x [in module %s]"),
19772 form_name, to_underlying (cu->header.sect_off), objf_name);
19773 if (str_index * cu->header.offset_size >= str_offsets_section->size)
19774 error (_("%s pointing outside of .debug_str_offsets.dwo"
19775 " section in CU at offset 0x%x [in module %s]"),
19776 form_name, to_underlying (cu->header.sect_off), objf_name);
19777 info_ptr = (str_offsets_section->buffer
19778 + str_index * cu->header.offset_size);
19779 if (cu->header.offset_size == 4)
19780 str_offset = bfd_get_32 (abfd, info_ptr);
19782 str_offset = bfd_get_64 (abfd, info_ptr);
19783 if (str_offset >= str_section->size)
19784 error (_("Offset from %s pointing outside of"
19785 " .debug_str.dwo section in CU at offset 0x%x [in module %s]"),
19786 form_name, to_underlying (cu->header.sect_off), objf_name);
19787 return (const char *) (str_section->buffer + str_offset);
19790 /* Return the length of an LEB128 number in BUF. */
19793 leb128_size (const gdb_byte *buf)
19795 const gdb_byte *begin = buf;
19801 if ((byte & 128) == 0)
19802 return buf - begin;
19807 set_cu_language (unsigned int lang, struct dwarf2_cu *cu)
19816 cu->language = language_c;
19819 case DW_LANG_C_plus_plus:
19820 case DW_LANG_C_plus_plus_11:
19821 case DW_LANG_C_plus_plus_14:
19822 cu->language = language_cplus;
19825 cu->language = language_d;
19827 case DW_LANG_Fortran77:
19828 case DW_LANG_Fortran90:
19829 case DW_LANG_Fortran95:
19830 case DW_LANG_Fortran03:
19831 case DW_LANG_Fortran08:
19832 cu->language = language_fortran;
19835 cu->language = language_go;
19837 case DW_LANG_Mips_Assembler:
19838 cu->language = language_asm;
19840 case DW_LANG_Ada83:
19841 case DW_LANG_Ada95:
19842 cu->language = language_ada;
19844 case DW_LANG_Modula2:
19845 cu->language = language_m2;
19847 case DW_LANG_Pascal83:
19848 cu->language = language_pascal;
19851 cu->language = language_objc;
19854 case DW_LANG_Rust_old:
19855 cu->language = language_rust;
19857 case DW_LANG_Cobol74:
19858 case DW_LANG_Cobol85:
19860 cu->language = language_minimal;
19863 cu->language_defn = language_def (cu->language);
19866 /* Return the named attribute or NULL if not there. */
19868 static struct attribute *
19869 dwarf2_attr (struct die_info *die, unsigned int name, struct dwarf2_cu *cu)
19874 struct attribute *spec = NULL;
19876 for (i = 0; i < die->num_attrs; ++i)
19878 if (die->attrs[i].name == name)
19879 return &die->attrs[i];
19880 if (die->attrs[i].name == DW_AT_specification
19881 || die->attrs[i].name == DW_AT_abstract_origin)
19882 spec = &die->attrs[i];
19888 die = follow_die_ref (die, spec, &cu);
19894 /* Return the named attribute or NULL if not there,
19895 but do not follow DW_AT_specification, etc.
19896 This is for use in contexts where we're reading .debug_types dies.
19897 Following DW_AT_specification, DW_AT_abstract_origin will take us
19898 back up the chain, and we want to go down. */
19900 static struct attribute *
19901 dwarf2_attr_no_follow (struct die_info *die, unsigned int name)
19905 for (i = 0; i < die->num_attrs; ++i)
19906 if (die->attrs[i].name == name)
19907 return &die->attrs[i];
19912 /* Return the string associated with a string-typed attribute, or NULL if it
19913 is either not found or is of an incorrect type. */
19915 static const char *
19916 dwarf2_string_attr (struct die_info *die, unsigned int name, struct dwarf2_cu *cu)
19918 struct attribute *attr;
19919 const char *str = NULL;
19921 attr = dwarf2_attr (die, name, cu);
19925 if (attr->form == DW_FORM_strp || attr->form == DW_FORM_line_strp
19926 || attr->form == DW_FORM_string
19927 || attr->form == DW_FORM_GNU_str_index
19928 || attr->form == DW_FORM_GNU_strp_alt)
19929 str = DW_STRING (attr);
19931 complaint (&symfile_complaints,
19932 _("string type expected for attribute %s for "
19933 "DIE at 0x%x in module %s"),
19934 dwarf_attr_name (name), to_underlying (die->sect_off),
19935 objfile_name (cu->per_cu->dwarf2_per_objfile->objfile));
19941 /* Return non-zero iff the attribute NAME is defined for the given DIE,
19942 and holds a non-zero value. This function should only be used for
19943 DW_FORM_flag or DW_FORM_flag_present attributes. */
19946 dwarf2_flag_true_p (struct die_info *die, unsigned name, struct dwarf2_cu *cu)
19948 struct attribute *attr = dwarf2_attr (die, name, cu);
19950 return (attr && DW_UNSND (attr));
19954 die_is_declaration (struct die_info *die, struct dwarf2_cu *cu)
19956 /* A DIE is a declaration if it has a DW_AT_declaration attribute
19957 which value is non-zero. However, we have to be careful with
19958 DIEs having a DW_AT_specification attribute, because dwarf2_attr()
19959 (via dwarf2_flag_true_p) follows this attribute. So we may
19960 end up accidently finding a declaration attribute that belongs
19961 to a different DIE referenced by the specification attribute,
19962 even though the given DIE does not have a declaration attribute. */
19963 return (dwarf2_flag_true_p (die, DW_AT_declaration, cu)
19964 && dwarf2_attr (die, DW_AT_specification, cu) == NULL);
19967 /* Return the die giving the specification for DIE, if there is
19968 one. *SPEC_CU is the CU containing DIE on input, and the CU
19969 containing the return value on output. If there is no
19970 specification, but there is an abstract origin, that is
19973 static struct die_info *
19974 die_specification (struct die_info *die, struct dwarf2_cu **spec_cu)
19976 struct attribute *spec_attr = dwarf2_attr (die, DW_AT_specification,
19979 if (spec_attr == NULL)
19980 spec_attr = dwarf2_attr (die, DW_AT_abstract_origin, *spec_cu);
19982 if (spec_attr == NULL)
19985 return follow_die_ref (die, spec_attr, spec_cu);
19988 /* Stub for free_line_header to match void * callback types. */
19991 free_line_header_voidp (void *arg)
19993 struct line_header *lh = (struct line_header *) arg;
19999 line_header::add_include_dir (const char *include_dir)
20001 if (dwarf_line_debug >= 2)
20002 fprintf_unfiltered (gdb_stdlog, "Adding dir %zu: %s\n",
20003 include_dirs.size () + 1, include_dir);
20005 include_dirs.push_back (include_dir);
20009 line_header::add_file_name (const char *name,
20011 unsigned int mod_time,
20012 unsigned int length)
20014 if (dwarf_line_debug >= 2)
20015 fprintf_unfiltered (gdb_stdlog, "Adding file %u: %s\n",
20016 (unsigned) file_names.size () + 1, name);
20018 file_names.emplace_back (name, d_index, mod_time, length);
20021 /* A convenience function to find the proper .debug_line section for a CU. */
20023 static struct dwarf2_section_info *
20024 get_debug_line_section (struct dwarf2_cu *cu)
20026 struct dwarf2_section_info *section;
20027 struct dwarf2_per_objfile *dwarf2_per_objfile
20028 = cu->per_cu->dwarf2_per_objfile;
20030 /* For TUs in DWO files, the DW_AT_stmt_list attribute lives in the
20032 if (cu->dwo_unit && cu->per_cu->is_debug_types)
20033 section = &cu->dwo_unit->dwo_file->sections.line;
20034 else if (cu->per_cu->is_dwz)
20036 struct dwz_file *dwz = dwarf2_get_dwz_file (dwarf2_per_objfile);
20038 section = &dwz->line;
20041 section = &dwarf2_per_objfile->line;
20046 /* Read directory or file name entry format, starting with byte of
20047 format count entries, ULEB128 pairs of entry formats, ULEB128 of
20048 entries count and the entries themselves in the described entry
20052 read_formatted_entries (struct dwarf2_per_objfile *dwarf2_per_objfile,
20053 bfd *abfd, const gdb_byte **bufp,
20054 struct line_header *lh,
20055 const struct comp_unit_head *cu_header,
20056 void (*callback) (struct line_header *lh,
20059 unsigned int mod_time,
20060 unsigned int length))
20062 gdb_byte format_count, formati;
20063 ULONGEST data_count, datai;
20064 const gdb_byte *buf = *bufp;
20065 const gdb_byte *format_header_data;
20066 unsigned int bytes_read;
20068 format_count = read_1_byte (abfd, buf);
20070 format_header_data = buf;
20071 for (formati = 0; formati < format_count; formati++)
20073 read_unsigned_leb128 (abfd, buf, &bytes_read);
20075 read_unsigned_leb128 (abfd, buf, &bytes_read);
20079 data_count = read_unsigned_leb128 (abfd, buf, &bytes_read);
20081 for (datai = 0; datai < data_count; datai++)
20083 const gdb_byte *format = format_header_data;
20084 struct file_entry fe;
20086 for (formati = 0; formati < format_count; formati++)
20088 ULONGEST content_type = read_unsigned_leb128 (abfd, format, &bytes_read);
20089 format += bytes_read;
20091 ULONGEST form = read_unsigned_leb128 (abfd, format, &bytes_read);
20092 format += bytes_read;
20094 gdb::optional<const char *> string;
20095 gdb::optional<unsigned int> uint;
20099 case DW_FORM_string:
20100 string.emplace (read_direct_string (abfd, buf, &bytes_read));
20104 case DW_FORM_line_strp:
20105 string.emplace (read_indirect_line_string (dwarf2_per_objfile,
20112 case DW_FORM_data1:
20113 uint.emplace (read_1_byte (abfd, buf));
20117 case DW_FORM_data2:
20118 uint.emplace (read_2_bytes (abfd, buf));
20122 case DW_FORM_data4:
20123 uint.emplace (read_4_bytes (abfd, buf));
20127 case DW_FORM_data8:
20128 uint.emplace (read_8_bytes (abfd, buf));
20132 case DW_FORM_udata:
20133 uint.emplace (read_unsigned_leb128 (abfd, buf, &bytes_read));
20137 case DW_FORM_block:
20138 /* It is valid only for DW_LNCT_timestamp which is ignored by
20143 switch (content_type)
20146 if (string.has_value ())
20149 case DW_LNCT_directory_index:
20150 if (uint.has_value ())
20151 fe.d_index = (dir_index) *uint;
20153 case DW_LNCT_timestamp:
20154 if (uint.has_value ())
20155 fe.mod_time = *uint;
20158 if (uint.has_value ())
20164 complaint (&symfile_complaints,
20165 _("Unknown format content type %s"),
20166 pulongest (content_type));
20170 callback (lh, fe.name, fe.d_index, fe.mod_time, fe.length);
20176 /* Read the statement program header starting at OFFSET in
20177 .debug_line, or .debug_line.dwo. Return a pointer
20178 to a struct line_header, allocated using xmalloc.
20179 Returns NULL if there is a problem reading the header, e.g., if it
20180 has a version we don't understand.
20182 NOTE: the strings in the include directory and file name tables of
20183 the returned object point into the dwarf line section buffer,
20184 and must not be freed. */
20186 static line_header_up
20187 dwarf_decode_line_header (sect_offset sect_off, struct dwarf2_cu *cu)
20189 const gdb_byte *line_ptr;
20190 unsigned int bytes_read, offset_size;
20192 const char *cur_dir, *cur_file;
20193 struct dwarf2_section_info *section;
20195 struct dwarf2_per_objfile *dwarf2_per_objfile
20196 = cu->per_cu->dwarf2_per_objfile;
20198 section = get_debug_line_section (cu);
20199 dwarf2_read_section (dwarf2_per_objfile->objfile, section);
20200 if (section->buffer == NULL)
20202 if (cu->dwo_unit && cu->per_cu->is_debug_types)
20203 complaint (&symfile_complaints, _("missing .debug_line.dwo section"));
20205 complaint (&symfile_complaints, _("missing .debug_line section"));
20209 /* We can't do this until we know the section is non-empty.
20210 Only then do we know we have such a section. */
20211 abfd = get_section_bfd_owner (section);
20213 /* Make sure that at least there's room for the total_length field.
20214 That could be 12 bytes long, but we're just going to fudge that. */
20215 if (to_underlying (sect_off) + 4 >= section->size)
20217 dwarf2_statement_list_fits_in_line_number_section_complaint ();
20221 line_header_up lh (new line_header ());
20223 lh->sect_off = sect_off;
20224 lh->offset_in_dwz = cu->per_cu->is_dwz;
20226 line_ptr = section->buffer + to_underlying (sect_off);
20228 /* Read in the header. */
20230 read_checked_initial_length_and_offset (abfd, line_ptr, &cu->header,
20231 &bytes_read, &offset_size);
20232 line_ptr += bytes_read;
20233 if (line_ptr + lh->total_length > (section->buffer + section->size))
20235 dwarf2_statement_list_fits_in_line_number_section_complaint ();
20238 lh->statement_program_end = line_ptr + lh->total_length;
20239 lh->version = read_2_bytes (abfd, line_ptr);
20241 if (lh->version > 5)
20243 /* This is a version we don't understand. The format could have
20244 changed in ways we don't handle properly so just punt. */
20245 complaint (&symfile_complaints,
20246 _("unsupported version in .debug_line section"));
20249 if (lh->version >= 5)
20251 gdb_byte segment_selector_size;
20253 /* Skip address size. */
20254 read_1_byte (abfd, line_ptr);
20257 segment_selector_size = read_1_byte (abfd, line_ptr);
20259 if (segment_selector_size != 0)
20261 complaint (&symfile_complaints,
20262 _("unsupported segment selector size %u "
20263 "in .debug_line section"),
20264 segment_selector_size);
20268 lh->header_length = read_offset_1 (abfd, line_ptr, offset_size);
20269 line_ptr += offset_size;
20270 lh->minimum_instruction_length = read_1_byte (abfd, line_ptr);
20272 if (lh->version >= 4)
20274 lh->maximum_ops_per_instruction = read_1_byte (abfd, line_ptr);
20278 lh->maximum_ops_per_instruction = 1;
20280 if (lh->maximum_ops_per_instruction == 0)
20282 lh->maximum_ops_per_instruction = 1;
20283 complaint (&symfile_complaints,
20284 _("invalid maximum_ops_per_instruction "
20285 "in `.debug_line' section"));
20288 lh->default_is_stmt = read_1_byte (abfd, line_ptr);
20290 lh->line_base = read_1_signed_byte (abfd, line_ptr);
20292 lh->line_range = read_1_byte (abfd, line_ptr);
20294 lh->opcode_base = read_1_byte (abfd, line_ptr);
20296 lh->standard_opcode_lengths.reset (new unsigned char[lh->opcode_base]);
20298 lh->standard_opcode_lengths[0] = 1; /* This should never be used anyway. */
20299 for (i = 1; i < lh->opcode_base; ++i)
20301 lh->standard_opcode_lengths[i] = read_1_byte (abfd, line_ptr);
20305 if (lh->version >= 5)
20307 /* Read directory table. */
20308 read_formatted_entries (dwarf2_per_objfile, abfd, &line_ptr, lh.get (),
20310 [] (struct line_header *lh, const char *name,
20311 dir_index d_index, unsigned int mod_time,
20312 unsigned int length)
20314 lh->add_include_dir (name);
20317 /* Read file name table. */
20318 read_formatted_entries (dwarf2_per_objfile, abfd, &line_ptr, lh.get (),
20320 [] (struct line_header *lh, const char *name,
20321 dir_index d_index, unsigned int mod_time,
20322 unsigned int length)
20324 lh->add_file_name (name, d_index, mod_time, length);
20329 /* Read directory table. */
20330 while ((cur_dir = read_direct_string (abfd, line_ptr, &bytes_read)) != NULL)
20332 line_ptr += bytes_read;
20333 lh->add_include_dir (cur_dir);
20335 line_ptr += bytes_read;
20337 /* Read file name table. */
20338 while ((cur_file = read_direct_string (abfd, line_ptr, &bytes_read)) != NULL)
20340 unsigned int mod_time, length;
20343 line_ptr += bytes_read;
20344 d_index = (dir_index) read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
20345 line_ptr += bytes_read;
20346 mod_time = read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
20347 line_ptr += bytes_read;
20348 length = read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
20349 line_ptr += bytes_read;
20351 lh->add_file_name (cur_file, d_index, mod_time, length);
20353 line_ptr += bytes_read;
20355 lh->statement_program_start = line_ptr;
20357 if (line_ptr > (section->buffer + section->size))
20358 complaint (&symfile_complaints,
20359 _("line number info header doesn't "
20360 "fit in `.debug_line' section"));
20365 /* Subroutine of dwarf_decode_lines to simplify it.
20366 Return the file name of the psymtab for included file FILE_INDEX
20367 in line header LH of PST.
20368 COMP_DIR is the compilation directory (DW_AT_comp_dir) or NULL if unknown.
20369 If space for the result is malloc'd, *NAME_HOLDER will be set.
20370 Returns NULL if FILE_INDEX should be ignored, i.e., it is pst->filename. */
20372 static const char *
20373 psymtab_include_file_name (const struct line_header *lh, int file_index,
20374 const struct partial_symtab *pst,
20375 const char *comp_dir,
20376 gdb::unique_xmalloc_ptr<char> *name_holder)
20378 const file_entry &fe = lh->file_names[file_index];
20379 const char *include_name = fe.name;
20380 const char *include_name_to_compare = include_name;
20381 const char *pst_filename;
20384 const char *dir_name = fe.include_dir (lh);
20386 gdb::unique_xmalloc_ptr<char> hold_compare;
20387 if (!IS_ABSOLUTE_PATH (include_name)
20388 && (dir_name != NULL || comp_dir != NULL))
20390 /* Avoid creating a duplicate psymtab for PST.
20391 We do this by comparing INCLUDE_NAME and PST_FILENAME.
20392 Before we do the comparison, however, we need to account
20393 for DIR_NAME and COMP_DIR.
20394 First prepend dir_name (if non-NULL). If we still don't
20395 have an absolute path prepend comp_dir (if non-NULL).
20396 However, the directory we record in the include-file's
20397 psymtab does not contain COMP_DIR (to match the
20398 corresponding symtab(s)).
20403 bash$ gcc -g ./hello.c
20404 include_name = "hello.c"
20406 DW_AT_comp_dir = comp_dir = "/tmp"
20407 DW_AT_name = "./hello.c"
20411 if (dir_name != NULL)
20413 name_holder->reset (concat (dir_name, SLASH_STRING,
20414 include_name, (char *) NULL));
20415 include_name = name_holder->get ();
20416 include_name_to_compare = include_name;
20418 if (!IS_ABSOLUTE_PATH (include_name) && comp_dir != NULL)
20420 hold_compare.reset (concat (comp_dir, SLASH_STRING,
20421 include_name, (char *) NULL));
20422 include_name_to_compare = hold_compare.get ();
20426 pst_filename = pst->filename;
20427 gdb::unique_xmalloc_ptr<char> copied_name;
20428 if (!IS_ABSOLUTE_PATH (pst_filename) && pst->dirname != NULL)
20430 copied_name.reset (concat (pst->dirname, SLASH_STRING,
20431 pst_filename, (char *) NULL));
20432 pst_filename = copied_name.get ();
20435 file_is_pst = FILENAME_CMP (include_name_to_compare, pst_filename) == 0;
20439 return include_name;
20442 /* State machine to track the state of the line number program. */
20444 class lnp_state_machine
20447 /* Initialize a machine state for the start of a line number
20449 lnp_state_machine (gdbarch *arch, line_header *lh, bool record_lines_p);
20451 file_entry *current_file ()
20453 /* lh->file_names is 0-based, but the file name numbers in the
20454 statement program are 1-based. */
20455 return m_line_header->file_name_at (m_file);
20458 /* Record the line in the state machine. END_SEQUENCE is true if
20459 we're processing the end of a sequence. */
20460 void record_line (bool end_sequence);
20462 /* Check address and if invalid nop-out the rest of the lines in this
20464 void check_line_address (struct dwarf2_cu *cu,
20465 const gdb_byte *line_ptr,
20466 CORE_ADDR lowpc, CORE_ADDR address);
20468 void handle_set_discriminator (unsigned int discriminator)
20470 m_discriminator = discriminator;
20471 m_line_has_non_zero_discriminator |= discriminator != 0;
20474 /* Handle DW_LNE_set_address. */
20475 void handle_set_address (CORE_ADDR baseaddr, CORE_ADDR address)
20478 address += baseaddr;
20479 m_address = gdbarch_adjust_dwarf2_line (m_gdbarch, address, false);
20482 /* Handle DW_LNS_advance_pc. */
20483 void handle_advance_pc (CORE_ADDR adjust);
20485 /* Handle a special opcode. */
20486 void handle_special_opcode (unsigned char op_code);
20488 /* Handle DW_LNS_advance_line. */
20489 void handle_advance_line (int line_delta)
20491 advance_line (line_delta);
20494 /* Handle DW_LNS_set_file. */
20495 void handle_set_file (file_name_index file);
20497 /* Handle DW_LNS_negate_stmt. */
20498 void handle_negate_stmt ()
20500 m_is_stmt = !m_is_stmt;
20503 /* Handle DW_LNS_const_add_pc. */
20504 void handle_const_add_pc ();
20506 /* Handle DW_LNS_fixed_advance_pc. */
20507 void handle_fixed_advance_pc (CORE_ADDR addr_adj)
20509 m_address += gdbarch_adjust_dwarf2_line (m_gdbarch, addr_adj, true);
20513 /* Handle DW_LNS_copy. */
20514 void handle_copy ()
20516 record_line (false);
20517 m_discriminator = 0;
20520 /* Handle DW_LNE_end_sequence. */
20521 void handle_end_sequence ()
20523 m_record_line_callback = ::record_line;
20527 /* Advance the line by LINE_DELTA. */
20528 void advance_line (int line_delta)
20530 m_line += line_delta;
20532 if (line_delta != 0)
20533 m_line_has_non_zero_discriminator = m_discriminator != 0;
20536 gdbarch *m_gdbarch;
20538 /* True if we're recording lines.
20539 Otherwise we're building partial symtabs and are just interested in
20540 finding include files mentioned by the line number program. */
20541 bool m_record_lines_p;
20543 /* The line number header. */
20544 line_header *m_line_header;
20546 /* These are part of the standard DWARF line number state machine,
20547 and initialized according to the DWARF spec. */
20549 unsigned char m_op_index = 0;
20550 /* The line table index (1-based) of the current file. */
20551 file_name_index m_file = (file_name_index) 1;
20552 unsigned int m_line = 1;
20554 /* These are initialized in the constructor. */
20556 CORE_ADDR m_address;
20558 unsigned int m_discriminator;
20560 /* Additional bits of state we need to track. */
20562 /* The last file that we called dwarf2_start_subfile for.
20563 This is only used for TLLs. */
20564 unsigned int m_last_file = 0;
20565 /* The last file a line number was recorded for. */
20566 struct subfile *m_last_subfile = NULL;
20568 /* The function to call to record a line. */
20569 record_line_ftype *m_record_line_callback = NULL;
20571 /* The last line number that was recorded, used to coalesce
20572 consecutive entries for the same line. This can happen, for
20573 example, when discriminators are present. PR 17276. */
20574 unsigned int m_last_line = 0;
20575 bool m_line_has_non_zero_discriminator = false;
20579 lnp_state_machine::handle_advance_pc (CORE_ADDR adjust)
20581 CORE_ADDR addr_adj = (((m_op_index + adjust)
20582 / m_line_header->maximum_ops_per_instruction)
20583 * m_line_header->minimum_instruction_length);
20584 m_address += gdbarch_adjust_dwarf2_line (m_gdbarch, addr_adj, true);
20585 m_op_index = ((m_op_index + adjust)
20586 % m_line_header->maximum_ops_per_instruction);
20590 lnp_state_machine::handle_special_opcode (unsigned char op_code)
20592 unsigned char adj_opcode = op_code - m_line_header->opcode_base;
20593 CORE_ADDR addr_adj = (((m_op_index
20594 + (adj_opcode / m_line_header->line_range))
20595 / m_line_header->maximum_ops_per_instruction)
20596 * m_line_header->minimum_instruction_length);
20597 m_address += gdbarch_adjust_dwarf2_line (m_gdbarch, addr_adj, true);
20598 m_op_index = ((m_op_index + (adj_opcode / m_line_header->line_range))
20599 % m_line_header->maximum_ops_per_instruction);
20601 int line_delta = (m_line_header->line_base
20602 + (adj_opcode % m_line_header->line_range));
20603 advance_line (line_delta);
20604 record_line (false);
20605 m_discriminator = 0;
20609 lnp_state_machine::handle_set_file (file_name_index file)
20613 const file_entry *fe = current_file ();
20615 dwarf2_debug_line_missing_file_complaint ();
20616 else if (m_record_lines_p)
20618 const char *dir = fe->include_dir (m_line_header);
20620 m_last_subfile = current_subfile;
20621 m_line_has_non_zero_discriminator = m_discriminator != 0;
20622 dwarf2_start_subfile (fe->name, dir);
20627 lnp_state_machine::handle_const_add_pc ()
20630 = (255 - m_line_header->opcode_base) / m_line_header->line_range;
20633 = (((m_op_index + adjust)
20634 / m_line_header->maximum_ops_per_instruction)
20635 * m_line_header->minimum_instruction_length);
20637 m_address += gdbarch_adjust_dwarf2_line (m_gdbarch, addr_adj, true);
20638 m_op_index = ((m_op_index + adjust)
20639 % m_line_header->maximum_ops_per_instruction);
20642 /* Ignore this record_line request. */
20645 noop_record_line (struct subfile *subfile, int line, CORE_ADDR pc)
20650 /* Return non-zero if we should add LINE to the line number table.
20651 LINE is the line to add, LAST_LINE is the last line that was added,
20652 LAST_SUBFILE is the subfile for LAST_LINE.
20653 LINE_HAS_NON_ZERO_DISCRIMINATOR is non-zero if LINE has ever
20654 had a non-zero discriminator.
20656 We have to be careful in the presence of discriminators.
20657 E.g., for this line:
20659 for (i = 0; i < 100000; i++);
20661 clang can emit four line number entries for that one line,
20662 each with a different discriminator.
20663 See gdb.dwarf2/dw2-single-line-discriminators.exp for an example.
20665 However, we want gdb to coalesce all four entries into one.
20666 Otherwise the user could stepi into the middle of the line and
20667 gdb would get confused about whether the pc really was in the
20668 middle of the line.
20670 Things are further complicated by the fact that two consecutive
20671 line number entries for the same line is a heuristic used by gcc
20672 to denote the end of the prologue. So we can't just discard duplicate
20673 entries, we have to be selective about it. The heuristic we use is
20674 that we only collapse consecutive entries for the same line if at least
20675 one of those entries has a non-zero discriminator. PR 17276.
20677 Note: Addresses in the line number state machine can never go backwards
20678 within one sequence, thus this coalescing is ok. */
20681 dwarf_record_line_p (unsigned int line, unsigned int last_line,
20682 int line_has_non_zero_discriminator,
20683 struct subfile *last_subfile)
20685 if (current_subfile != last_subfile)
20687 if (line != last_line)
20689 /* Same line for the same file that we've seen already.
20690 As a last check, for pr 17276, only record the line if the line
20691 has never had a non-zero discriminator. */
20692 if (!line_has_non_zero_discriminator)
20697 /* Use P_RECORD_LINE to record line number LINE beginning at address ADDRESS
20698 in the line table of subfile SUBFILE. */
20701 dwarf_record_line_1 (struct gdbarch *gdbarch, struct subfile *subfile,
20702 unsigned int line, CORE_ADDR address,
20703 record_line_ftype p_record_line)
20705 CORE_ADDR addr = gdbarch_addr_bits_remove (gdbarch, address);
20707 if (dwarf_line_debug)
20709 fprintf_unfiltered (gdb_stdlog,
20710 "Recording line %u, file %s, address %s\n",
20711 line, lbasename (subfile->name),
20712 paddress (gdbarch, address));
20715 (*p_record_line) (subfile, line, addr);
20718 /* Subroutine of dwarf_decode_lines_1 to simplify it.
20719 Mark the end of a set of line number records.
20720 The arguments are the same as for dwarf_record_line_1.
20721 If SUBFILE is NULL the request is ignored. */
20724 dwarf_finish_line (struct gdbarch *gdbarch, struct subfile *subfile,
20725 CORE_ADDR address, record_line_ftype p_record_line)
20727 if (subfile == NULL)
20730 if (dwarf_line_debug)
20732 fprintf_unfiltered (gdb_stdlog,
20733 "Finishing current line, file %s, address %s\n",
20734 lbasename (subfile->name),
20735 paddress (gdbarch, address));
20738 dwarf_record_line_1 (gdbarch, subfile, 0, address, p_record_line);
20742 lnp_state_machine::record_line (bool end_sequence)
20744 if (dwarf_line_debug)
20746 fprintf_unfiltered (gdb_stdlog,
20747 "Processing actual line %u: file %u,"
20748 " address %s, is_stmt %u, discrim %u\n",
20749 m_line, to_underlying (m_file),
20750 paddress (m_gdbarch, m_address),
20751 m_is_stmt, m_discriminator);
20754 file_entry *fe = current_file ();
20757 dwarf2_debug_line_missing_file_complaint ();
20758 /* For now we ignore lines not starting on an instruction boundary.
20759 But not when processing end_sequence for compatibility with the
20760 previous version of the code. */
20761 else if (m_op_index == 0 || end_sequence)
20763 fe->included_p = 1;
20764 if (m_record_lines_p && m_is_stmt)
20766 if (m_last_subfile != current_subfile || end_sequence)
20768 dwarf_finish_line (m_gdbarch, m_last_subfile,
20769 m_address, m_record_line_callback);
20774 if (dwarf_record_line_p (m_line, m_last_line,
20775 m_line_has_non_zero_discriminator,
20778 dwarf_record_line_1 (m_gdbarch, current_subfile,
20780 m_record_line_callback);
20782 m_last_subfile = current_subfile;
20783 m_last_line = m_line;
20789 lnp_state_machine::lnp_state_machine (gdbarch *arch, line_header *lh,
20790 bool record_lines_p)
20793 m_record_lines_p = record_lines_p;
20794 m_line_header = lh;
20796 m_record_line_callback = ::record_line;
20798 /* Call `gdbarch_adjust_dwarf2_line' on the initial 0 address as if there
20799 was a line entry for it so that the backend has a chance to adjust it
20800 and also record it in case it needs it. This is currently used by MIPS
20801 code, cf. `mips_adjust_dwarf2_line'. */
20802 m_address = gdbarch_adjust_dwarf2_line (arch, 0, 0);
20803 m_is_stmt = lh->default_is_stmt;
20804 m_discriminator = 0;
20808 lnp_state_machine::check_line_address (struct dwarf2_cu *cu,
20809 const gdb_byte *line_ptr,
20810 CORE_ADDR lowpc, CORE_ADDR address)
20812 /* If address < lowpc then it's not a usable value, it's outside the
20813 pc range of the CU. However, we restrict the test to only address
20814 values of zero to preserve GDB's previous behaviour which is to
20815 handle the specific case of a function being GC'd by the linker. */
20817 if (address == 0 && address < lowpc)
20819 /* This line table is for a function which has been
20820 GCd by the linker. Ignore it. PR gdb/12528 */
20822 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
20823 long line_offset = line_ptr - get_debug_line_section (cu)->buffer;
20825 complaint (&symfile_complaints,
20826 _(".debug_line address at offset 0x%lx is 0 [in module %s]"),
20827 line_offset, objfile_name (objfile));
20828 m_record_line_callback = noop_record_line;
20829 /* Note: record_line_callback is left as noop_record_line until
20830 we see DW_LNE_end_sequence. */
20834 /* Subroutine of dwarf_decode_lines to simplify it.
20835 Process the line number information in LH.
20836 If DECODE_FOR_PST_P is non-zero, all we do is process the line number
20837 program in order to set included_p for every referenced header. */
20840 dwarf_decode_lines_1 (struct line_header *lh, struct dwarf2_cu *cu,
20841 const int decode_for_pst_p, CORE_ADDR lowpc)
20843 const gdb_byte *line_ptr, *extended_end;
20844 const gdb_byte *line_end;
20845 unsigned int bytes_read, extended_len;
20846 unsigned char op_code, extended_op;
20847 CORE_ADDR baseaddr;
20848 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
20849 bfd *abfd = objfile->obfd;
20850 struct gdbarch *gdbarch = get_objfile_arch (objfile);
20851 /* True if we're recording line info (as opposed to building partial
20852 symtabs and just interested in finding include files mentioned by
20853 the line number program). */
20854 bool record_lines_p = !decode_for_pst_p;
20856 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
20858 line_ptr = lh->statement_program_start;
20859 line_end = lh->statement_program_end;
20861 /* Read the statement sequences until there's nothing left. */
20862 while (line_ptr < line_end)
20864 /* The DWARF line number program state machine. Reset the state
20865 machine at the start of each sequence. */
20866 lnp_state_machine state_machine (gdbarch, lh, record_lines_p);
20867 bool end_sequence = false;
20869 if (record_lines_p)
20871 /* Start a subfile for the current file of the state
20873 const file_entry *fe = state_machine.current_file ();
20876 dwarf2_start_subfile (fe->name, fe->include_dir (lh));
20879 /* Decode the table. */
20880 while (line_ptr < line_end && !end_sequence)
20882 op_code = read_1_byte (abfd, line_ptr);
20885 if (op_code >= lh->opcode_base)
20887 /* Special opcode. */
20888 state_machine.handle_special_opcode (op_code);
20890 else switch (op_code)
20892 case DW_LNS_extended_op:
20893 extended_len = read_unsigned_leb128 (abfd, line_ptr,
20895 line_ptr += bytes_read;
20896 extended_end = line_ptr + extended_len;
20897 extended_op = read_1_byte (abfd, line_ptr);
20899 switch (extended_op)
20901 case DW_LNE_end_sequence:
20902 state_machine.handle_end_sequence ();
20903 end_sequence = true;
20905 case DW_LNE_set_address:
20908 = read_address (abfd, line_ptr, cu, &bytes_read);
20909 line_ptr += bytes_read;
20911 state_machine.check_line_address (cu, line_ptr,
20913 state_machine.handle_set_address (baseaddr, address);
20916 case DW_LNE_define_file:
20918 const char *cur_file;
20919 unsigned int mod_time, length;
20922 cur_file = read_direct_string (abfd, line_ptr,
20924 line_ptr += bytes_read;
20925 dindex = (dir_index)
20926 read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
20927 line_ptr += bytes_read;
20929 read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
20930 line_ptr += bytes_read;
20932 read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
20933 line_ptr += bytes_read;
20934 lh->add_file_name (cur_file, dindex, mod_time, length);
20937 case DW_LNE_set_discriminator:
20939 /* The discriminator is not interesting to the
20940 debugger; just ignore it. We still need to
20941 check its value though:
20942 if there are consecutive entries for the same
20943 (non-prologue) line we want to coalesce them.
20946 = read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
20947 line_ptr += bytes_read;
20949 state_machine.handle_set_discriminator (discr);
20953 complaint (&symfile_complaints,
20954 _("mangled .debug_line section"));
20957 /* Make sure that we parsed the extended op correctly. If e.g.
20958 we expected a different address size than the producer used,
20959 we may have read the wrong number of bytes. */
20960 if (line_ptr != extended_end)
20962 complaint (&symfile_complaints,
20963 _("mangled .debug_line section"));
20968 state_machine.handle_copy ();
20970 case DW_LNS_advance_pc:
20973 = read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
20974 line_ptr += bytes_read;
20976 state_machine.handle_advance_pc (adjust);
20979 case DW_LNS_advance_line:
20982 = read_signed_leb128 (abfd, line_ptr, &bytes_read);
20983 line_ptr += bytes_read;
20985 state_machine.handle_advance_line (line_delta);
20988 case DW_LNS_set_file:
20990 file_name_index file
20991 = (file_name_index) read_unsigned_leb128 (abfd, line_ptr,
20993 line_ptr += bytes_read;
20995 state_machine.handle_set_file (file);
20998 case DW_LNS_set_column:
20999 (void) read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
21000 line_ptr += bytes_read;
21002 case DW_LNS_negate_stmt:
21003 state_machine.handle_negate_stmt ();
21005 case DW_LNS_set_basic_block:
21007 /* Add to the address register of the state machine the
21008 address increment value corresponding to special opcode
21009 255. I.e., this value is scaled by the minimum
21010 instruction length since special opcode 255 would have
21011 scaled the increment. */
21012 case DW_LNS_const_add_pc:
21013 state_machine.handle_const_add_pc ();
21015 case DW_LNS_fixed_advance_pc:
21017 CORE_ADDR addr_adj = read_2_bytes (abfd, line_ptr);
21020 state_machine.handle_fixed_advance_pc (addr_adj);
21025 /* Unknown standard opcode, ignore it. */
21028 for (i = 0; i < lh->standard_opcode_lengths[op_code]; i++)
21030 (void) read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
21031 line_ptr += bytes_read;
21038 dwarf2_debug_line_missing_end_sequence_complaint ();
21040 /* We got a DW_LNE_end_sequence (or we ran off the end of the buffer,
21041 in which case we still finish recording the last line). */
21042 state_machine.record_line (true);
21046 /* Decode the Line Number Program (LNP) for the given line_header
21047 structure and CU. The actual information extracted and the type
21048 of structures created from the LNP depends on the value of PST.
21050 1. If PST is NULL, then this procedure uses the data from the program
21051 to create all necessary symbol tables, and their linetables.
21053 2. If PST is not NULL, this procedure reads the program to determine
21054 the list of files included by the unit represented by PST, and
21055 builds all the associated partial symbol tables.
21057 COMP_DIR is the compilation directory (DW_AT_comp_dir) or NULL if unknown.
21058 It is used for relative paths in the line table.
21059 NOTE: When processing partial symtabs (pst != NULL),
21060 comp_dir == pst->dirname.
21062 NOTE: It is important that psymtabs have the same file name (via strcmp)
21063 as the corresponding symtab. Since COMP_DIR is not used in the name of the
21064 symtab we don't use it in the name of the psymtabs we create.
21065 E.g. expand_line_sal requires this when finding psymtabs to expand.
21066 A good testcase for this is mb-inline.exp.
21068 LOWPC is the lowest address in CU (or 0 if not known).
21070 Boolean DECODE_MAPPING specifies we need to fully decode .debug_line
21071 for its PC<->lines mapping information. Otherwise only the filename
21072 table is read in. */
21075 dwarf_decode_lines (struct line_header *lh, const char *comp_dir,
21076 struct dwarf2_cu *cu, struct partial_symtab *pst,
21077 CORE_ADDR lowpc, int decode_mapping)
21079 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
21080 const int decode_for_pst_p = (pst != NULL);
21082 if (decode_mapping)
21083 dwarf_decode_lines_1 (lh, cu, decode_for_pst_p, lowpc);
21085 if (decode_for_pst_p)
21089 /* Now that we're done scanning the Line Header Program, we can
21090 create the psymtab of each included file. */
21091 for (file_index = 0; file_index < lh->file_names.size (); file_index++)
21092 if (lh->file_names[file_index].included_p == 1)
21094 gdb::unique_xmalloc_ptr<char> name_holder;
21095 const char *include_name =
21096 psymtab_include_file_name (lh, file_index, pst, comp_dir,
21098 if (include_name != NULL)
21099 dwarf2_create_include_psymtab (include_name, pst, objfile);
21104 /* Make sure a symtab is created for every file, even files
21105 which contain only variables (i.e. no code with associated
21107 struct compunit_symtab *cust = buildsym_compunit_symtab ();
21110 for (i = 0; i < lh->file_names.size (); i++)
21112 file_entry &fe = lh->file_names[i];
21114 dwarf2_start_subfile (fe.name, fe.include_dir (lh));
21116 if (current_subfile->symtab == NULL)
21118 current_subfile->symtab
21119 = allocate_symtab (cust, current_subfile->name);
21121 fe.symtab = current_subfile->symtab;
21126 /* Start a subfile for DWARF. FILENAME is the name of the file and
21127 DIRNAME the name of the source directory which contains FILENAME
21128 or NULL if not known.
21129 This routine tries to keep line numbers from identical absolute and
21130 relative file names in a common subfile.
21132 Using the `list' example from the GDB testsuite, which resides in
21133 /srcdir and compiling it with Irix6.2 cc in /compdir using a filename
21134 of /srcdir/list0.c yields the following debugging information for list0.c:
21136 DW_AT_name: /srcdir/list0.c
21137 DW_AT_comp_dir: /compdir
21138 files.files[0].name: list0.h
21139 files.files[0].dir: /srcdir
21140 files.files[1].name: list0.c
21141 files.files[1].dir: /srcdir
21143 The line number information for list0.c has to end up in a single
21144 subfile, so that `break /srcdir/list0.c:1' works as expected.
21145 start_subfile will ensure that this happens provided that we pass the
21146 concatenation of files.files[1].dir and files.files[1].name as the
21150 dwarf2_start_subfile (const char *filename, const char *dirname)
21154 /* In order not to lose the line information directory,
21155 we concatenate it to the filename when it makes sense.
21156 Note that the Dwarf3 standard says (speaking of filenames in line
21157 information): ``The directory index is ignored for file names
21158 that represent full path names''. Thus ignoring dirname in the
21159 `else' branch below isn't an issue. */
21161 if (!IS_ABSOLUTE_PATH (filename) && dirname != NULL)
21163 copy = concat (dirname, SLASH_STRING, filename, (char *)NULL);
21167 start_subfile (filename);
21173 /* Start a symtab for DWARF.
21174 NAME, COMP_DIR, LOW_PC are passed to start_symtab. */
21176 static struct compunit_symtab *
21177 dwarf2_start_symtab (struct dwarf2_cu *cu,
21178 const char *name, const char *comp_dir, CORE_ADDR low_pc)
21180 struct compunit_symtab *cust
21181 = start_symtab (cu->per_cu->dwarf2_per_objfile->objfile, name, comp_dir,
21182 low_pc, cu->language);
21184 record_debugformat ("DWARF 2");
21185 record_producer (cu->producer);
21187 /* We assume that we're processing GCC output. */
21188 processing_gcc_compilation = 2;
21190 cu->processing_has_namespace_info = 0;
21196 var_decode_location (struct attribute *attr, struct symbol *sym,
21197 struct dwarf2_cu *cu)
21199 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
21200 struct comp_unit_head *cu_header = &cu->header;
21202 /* NOTE drow/2003-01-30: There used to be a comment and some special
21203 code here to turn a symbol with DW_AT_external and a
21204 SYMBOL_VALUE_ADDRESS of 0 into a LOC_UNRESOLVED symbol. This was
21205 necessary for platforms (maybe Alpha, certainly PowerPC GNU/Linux
21206 with some versions of binutils) where shared libraries could have
21207 relocations against symbols in their debug information - the
21208 minimal symbol would have the right address, but the debug info
21209 would not. It's no longer necessary, because we will explicitly
21210 apply relocations when we read in the debug information now. */
21212 /* A DW_AT_location attribute with no contents indicates that a
21213 variable has been optimized away. */
21214 if (attr_form_is_block (attr) && DW_BLOCK (attr)->size == 0)
21216 SYMBOL_ACLASS_INDEX (sym) = LOC_OPTIMIZED_OUT;
21220 /* Handle one degenerate form of location expression specially, to
21221 preserve GDB's previous behavior when section offsets are
21222 specified. If this is just a DW_OP_addr or DW_OP_GNU_addr_index
21223 then mark this symbol as LOC_STATIC. */
21225 if (attr_form_is_block (attr)
21226 && ((DW_BLOCK (attr)->data[0] == DW_OP_addr
21227 && DW_BLOCK (attr)->size == 1 + cu_header->addr_size)
21228 || (DW_BLOCK (attr)->data[0] == DW_OP_GNU_addr_index
21229 && (DW_BLOCK (attr)->size
21230 == 1 + leb128_size (&DW_BLOCK (attr)->data[1])))))
21232 unsigned int dummy;
21234 if (DW_BLOCK (attr)->data[0] == DW_OP_addr)
21235 SYMBOL_VALUE_ADDRESS (sym) =
21236 read_address (objfile->obfd, DW_BLOCK (attr)->data + 1, cu, &dummy);
21238 SYMBOL_VALUE_ADDRESS (sym) =
21239 read_addr_index_from_leb128 (cu, DW_BLOCK (attr)->data + 1, &dummy);
21240 SYMBOL_ACLASS_INDEX (sym) = LOC_STATIC;
21241 fixup_symbol_section (sym, objfile);
21242 SYMBOL_VALUE_ADDRESS (sym) += ANOFFSET (objfile->section_offsets,
21243 SYMBOL_SECTION (sym));
21247 /* NOTE drow/2002-01-30: It might be worthwhile to have a static
21248 expression evaluator, and use LOC_COMPUTED only when necessary
21249 (i.e. when the value of a register or memory location is
21250 referenced, or a thread-local block, etc.). Then again, it might
21251 not be worthwhile. I'm assuming that it isn't unless performance
21252 or memory numbers show me otherwise. */
21254 dwarf2_symbol_mark_computed (attr, sym, cu, 0);
21256 if (SYMBOL_COMPUTED_OPS (sym)->location_has_loclist)
21257 cu->has_loclist = 1;
21260 /* Given a pointer to a DWARF information entry, figure out if we need
21261 to make a symbol table entry for it, and if so, create a new entry
21262 and return a pointer to it.
21263 If TYPE is NULL, determine symbol type from the die, otherwise
21264 used the passed type.
21265 If SPACE is not NULL, use it to hold the new symbol. If it is
21266 NULL, allocate a new symbol on the objfile's obstack. */
21268 static struct symbol *
21269 new_symbol (struct die_info *die, struct type *type, struct dwarf2_cu *cu,
21270 struct symbol *space)
21272 struct dwarf2_per_objfile *dwarf2_per_objfile
21273 = cu->per_cu->dwarf2_per_objfile;
21274 struct objfile *objfile = dwarf2_per_objfile->objfile;
21275 struct gdbarch *gdbarch = get_objfile_arch (objfile);
21276 struct symbol *sym = NULL;
21278 struct attribute *attr = NULL;
21279 struct attribute *attr2 = NULL;
21280 CORE_ADDR baseaddr;
21281 struct pending **list_to_add = NULL;
21283 int inlined_func = (die->tag == DW_TAG_inlined_subroutine);
21285 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
21287 name = dwarf2_name (die, cu);
21290 const char *linkagename;
21291 int suppress_add = 0;
21296 sym = allocate_symbol (objfile);
21297 OBJSTAT (objfile, n_syms++);
21299 /* Cache this symbol's name and the name's demangled form (if any). */
21300 SYMBOL_SET_LANGUAGE (sym, cu->language, &objfile->objfile_obstack);
21301 linkagename = dwarf2_physname (name, die, cu);
21302 SYMBOL_SET_NAMES (sym, linkagename, strlen (linkagename), 0, objfile);
21304 /* Fortran does not have mangling standard and the mangling does differ
21305 between gfortran, iFort etc. */
21306 if (cu->language == language_fortran
21307 && symbol_get_demangled_name (&(sym->ginfo)) == NULL)
21308 symbol_set_demangled_name (&(sym->ginfo),
21309 dwarf2_full_name (name, die, cu),
21312 /* Default assumptions.
21313 Use the passed type or decode it from the die. */
21314 SYMBOL_DOMAIN (sym) = VAR_DOMAIN;
21315 SYMBOL_ACLASS_INDEX (sym) = LOC_OPTIMIZED_OUT;
21317 SYMBOL_TYPE (sym) = type;
21319 SYMBOL_TYPE (sym) = die_type (die, cu);
21320 attr = dwarf2_attr (die,
21321 inlined_func ? DW_AT_call_line : DW_AT_decl_line,
21325 SYMBOL_LINE (sym) = DW_UNSND (attr);
21328 attr = dwarf2_attr (die,
21329 inlined_func ? DW_AT_call_file : DW_AT_decl_file,
21333 file_name_index file_index = (file_name_index) DW_UNSND (attr);
21334 struct file_entry *fe;
21336 if (cu->line_header != NULL)
21337 fe = cu->line_header->file_name_at (file_index);
21342 complaint (&symfile_complaints,
21343 _("file index out of range"));
21345 symbol_set_symtab (sym, fe->symtab);
21351 attr = dwarf2_attr (die, DW_AT_low_pc, cu);
21356 addr = attr_value_as_address (attr);
21357 addr = gdbarch_adjust_dwarf2_addr (gdbarch, addr + baseaddr);
21358 SYMBOL_VALUE_ADDRESS (sym) = addr;
21360 SYMBOL_TYPE (sym) = objfile_type (objfile)->builtin_core_addr;
21361 SYMBOL_DOMAIN (sym) = LABEL_DOMAIN;
21362 SYMBOL_ACLASS_INDEX (sym) = LOC_LABEL;
21363 add_symbol_to_list (sym, cu->list_in_scope);
21365 case DW_TAG_subprogram:
21366 /* SYMBOL_BLOCK_VALUE (sym) will be filled in later by
21368 SYMBOL_ACLASS_INDEX (sym) = LOC_BLOCK;
21369 attr2 = dwarf2_attr (die, DW_AT_external, cu);
21370 if ((attr2 && (DW_UNSND (attr2) != 0))
21371 || cu->language == language_ada)
21373 /* Subprograms marked external are stored as a global symbol.
21374 Ada subprograms, whether marked external or not, are always
21375 stored as a global symbol, because we want to be able to
21376 access them globally. For instance, we want to be able
21377 to break on a nested subprogram without having to
21378 specify the context. */
21379 list_to_add = &global_symbols;
21383 list_to_add = cu->list_in_scope;
21386 case DW_TAG_inlined_subroutine:
21387 /* SYMBOL_BLOCK_VALUE (sym) will be filled in later by
21389 SYMBOL_ACLASS_INDEX (sym) = LOC_BLOCK;
21390 SYMBOL_INLINED (sym) = 1;
21391 list_to_add = cu->list_in_scope;
21393 case DW_TAG_template_value_param:
21395 /* Fall through. */
21396 case DW_TAG_constant:
21397 case DW_TAG_variable:
21398 case DW_TAG_member:
21399 /* Compilation with minimal debug info may result in
21400 variables with missing type entries. Change the
21401 misleading `void' type to something sensible. */
21402 if (TYPE_CODE (SYMBOL_TYPE (sym)) == TYPE_CODE_VOID)
21403 SYMBOL_TYPE (sym) = objfile_type (objfile)->builtin_int;
21405 attr = dwarf2_attr (die, DW_AT_const_value, cu);
21406 /* In the case of DW_TAG_member, we should only be called for
21407 static const members. */
21408 if (die->tag == DW_TAG_member)
21410 /* dwarf2_add_field uses die_is_declaration,
21411 so we do the same. */
21412 gdb_assert (die_is_declaration (die, cu));
21417 dwarf2_const_value (attr, sym, cu);
21418 attr2 = dwarf2_attr (die, DW_AT_external, cu);
21421 if (attr2 && (DW_UNSND (attr2) != 0))
21422 list_to_add = &global_symbols;
21424 list_to_add = cu->list_in_scope;
21428 attr = dwarf2_attr (die, DW_AT_location, cu);
21431 var_decode_location (attr, sym, cu);
21432 attr2 = dwarf2_attr (die, DW_AT_external, cu);
21434 /* Fortran explicitly imports any global symbols to the local
21435 scope by DW_TAG_common_block. */
21436 if (cu->language == language_fortran && die->parent
21437 && die->parent->tag == DW_TAG_common_block)
21440 if (SYMBOL_CLASS (sym) == LOC_STATIC
21441 && SYMBOL_VALUE_ADDRESS (sym) == 0
21442 && !dwarf2_per_objfile->has_section_at_zero)
21444 /* When a static variable is eliminated by the linker,
21445 the corresponding debug information is not stripped
21446 out, but the variable address is set to null;
21447 do not add such variables into symbol table. */
21449 else if (attr2 && (DW_UNSND (attr2) != 0))
21451 /* Workaround gfortran PR debug/40040 - it uses
21452 DW_AT_location for variables in -fPIC libraries which may
21453 get overriden by other libraries/executable and get
21454 a different address. Resolve it by the minimal symbol
21455 which may come from inferior's executable using copy
21456 relocation. Make this workaround only for gfortran as for
21457 other compilers GDB cannot guess the minimal symbol
21458 Fortran mangling kind. */
21459 if (cu->language == language_fortran && die->parent
21460 && die->parent->tag == DW_TAG_module
21462 && startswith (cu->producer, "GNU Fortran"))
21463 SYMBOL_ACLASS_INDEX (sym) = LOC_UNRESOLVED;
21465 /* A variable with DW_AT_external is never static,
21466 but it may be block-scoped. */
21467 list_to_add = (cu->list_in_scope == &file_symbols
21468 ? &global_symbols : cu->list_in_scope);
21471 list_to_add = cu->list_in_scope;
21475 /* We do not know the address of this symbol.
21476 If it is an external symbol and we have type information
21477 for it, enter the symbol as a LOC_UNRESOLVED symbol.
21478 The address of the variable will then be determined from
21479 the minimal symbol table whenever the variable is
21481 attr2 = dwarf2_attr (die, DW_AT_external, cu);
21483 /* Fortran explicitly imports any global symbols to the local
21484 scope by DW_TAG_common_block. */
21485 if (cu->language == language_fortran && die->parent
21486 && die->parent->tag == DW_TAG_common_block)
21488 /* SYMBOL_CLASS doesn't matter here because
21489 read_common_block is going to reset it. */
21491 list_to_add = cu->list_in_scope;
21493 else if (attr2 && (DW_UNSND (attr2) != 0)
21494 && dwarf2_attr (die, DW_AT_type, cu) != NULL)
21496 /* A variable with DW_AT_external is never static, but it
21497 may be block-scoped. */
21498 list_to_add = (cu->list_in_scope == &file_symbols
21499 ? &global_symbols : cu->list_in_scope);
21501 SYMBOL_ACLASS_INDEX (sym) = LOC_UNRESOLVED;
21503 else if (!die_is_declaration (die, cu))
21505 /* Use the default LOC_OPTIMIZED_OUT class. */
21506 gdb_assert (SYMBOL_CLASS (sym) == LOC_OPTIMIZED_OUT);
21508 list_to_add = cu->list_in_scope;
21512 case DW_TAG_formal_parameter:
21513 /* If we are inside a function, mark this as an argument. If
21514 not, we might be looking at an argument to an inlined function
21515 when we do not have enough information to show inlined frames;
21516 pretend it's a local variable in that case so that the user can
21518 if (context_stack_depth > 0
21519 && context_stack[context_stack_depth - 1].name != NULL)
21520 SYMBOL_IS_ARGUMENT (sym) = 1;
21521 attr = dwarf2_attr (die, DW_AT_location, cu);
21524 var_decode_location (attr, sym, cu);
21526 attr = dwarf2_attr (die, DW_AT_const_value, cu);
21529 dwarf2_const_value (attr, sym, cu);
21532 list_to_add = cu->list_in_scope;
21534 case DW_TAG_unspecified_parameters:
21535 /* From varargs functions; gdb doesn't seem to have any
21536 interest in this information, so just ignore it for now.
21539 case DW_TAG_template_type_param:
21541 /* Fall through. */
21542 case DW_TAG_class_type:
21543 case DW_TAG_interface_type:
21544 case DW_TAG_structure_type:
21545 case DW_TAG_union_type:
21546 case DW_TAG_set_type:
21547 case DW_TAG_enumeration_type:
21548 SYMBOL_ACLASS_INDEX (sym) = LOC_TYPEDEF;
21549 SYMBOL_DOMAIN (sym) = STRUCT_DOMAIN;
21552 /* NOTE: carlton/2003-11-10: C++ class symbols shouldn't
21553 really ever be static objects: otherwise, if you try
21554 to, say, break of a class's method and you're in a file
21555 which doesn't mention that class, it won't work unless
21556 the check for all static symbols in lookup_symbol_aux
21557 saves you. See the OtherFileClass tests in
21558 gdb.c++/namespace.exp. */
21562 list_to_add = (cu->list_in_scope == &file_symbols
21563 && cu->language == language_cplus
21564 ? &global_symbols : cu->list_in_scope);
21566 /* The semantics of C++ state that "struct foo {
21567 ... }" also defines a typedef for "foo". */
21568 if (cu->language == language_cplus
21569 || cu->language == language_ada
21570 || cu->language == language_d
21571 || cu->language == language_rust)
21573 /* The symbol's name is already allocated along
21574 with this objfile, so we don't need to
21575 duplicate it for the type. */
21576 if (TYPE_NAME (SYMBOL_TYPE (sym)) == 0)
21577 TYPE_NAME (SYMBOL_TYPE (sym)) = SYMBOL_SEARCH_NAME (sym);
21582 case DW_TAG_typedef:
21583 SYMBOL_ACLASS_INDEX (sym) = LOC_TYPEDEF;
21584 SYMBOL_DOMAIN (sym) = VAR_DOMAIN;
21585 list_to_add = cu->list_in_scope;
21587 case DW_TAG_base_type:
21588 case DW_TAG_subrange_type:
21589 SYMBOL_ACLASS_INDEX (sym) = LOC_TYPEDEF;
21590 SYMBOL_DOMAIN (sym) = VAR_DOMAIN;
21591 list_to_add = cu->list_in_scope;
21593 case DW_TAG_enumerator:
21594 attr = dwarf2_attr (die, DW_AT_const_value, cu);
21597 dwarf2_const_value (attr, sym, cu);
21600 /* NOTE: carlton/2003-11-10: See comment above in the
21601 DW_TAG_class_type, etc. block. */
21603 list_to_add = (cu->list_in_scope == &file_symbols
21604 && cu->language == language_cplus
21605 ? &global_symbols : cu->list_in_scope);
21608 case DW_TAG_imported_declaration:
21609 case DW_TAG_namespace:
21610 SYMBOL_ACLASS_INDEX (sym) = LOC_TYPEDEF;
21611 list_to_add = &global_symbols;
21613 case DW_TAG_module:
21614 SYMBOL_ACLASS_INDEX (sym) = LOC_TYPEDEF;
21615 SYMBOL_DOMAIN (sym) = MODULE_DOMAIN;
21616 list_to_add = &global_symbols;
21618 case DW_TAG_common_block:
21619 SYMBOL_ACLASS_INDEX (sym) = LOC_COMMON_BLOCK;
21620 SYMBOL_DOMAIN (sym) = COMMON_BLOCK_DOMAIN;
21621 add_symbol_to_list (sym, cu->list_in_scope);
21624 /* Not a tag we recognize. Hopefully we aren't processing
21625 trash data, but since we must specifically ignore things
21626 we don't recognize, there is nothing else we should do at
21628 complaint (&symfile_complaints, _("unsupported tag: '%s'"),
21629 dwarf_tag_name (die->tag));
21635 sym->hash_next = objfile->template_symbols;
21636 objfile->template_symbols = sym;
21637 list_to_add = NULL;
21640 if (list_to_add != NULL)
21641 add_symbol_to_list (sym, list_to_add);
21643 /* For the benefit of old versions of GCC, check for anonymous
21644 namespaces based on the demangled name. */
21645 if (!cu->processing_has_namespace_info
21646 && cu->language == language_cplus)
21647 cp_scan_for_anonymous_namespaces (sym, objfile);
21652 /* Given an attr with a DW_FORM_dataN value in host byte order,
21653 zero-extend it as appropriate for the symbol's type. The DWARF
21654 standard (v4) is not entirely clear about the meaning of using
21655 DW_FORM_dataN for a constant with a signed type, where the type is
21656 wider than the data. The conclusion of a discussion on the DWARF
21657 list was that this is unspecified. We choose to always zero-extend
21658 because that is the interpretation long in use by GCC. */
21661 dwarf2_const_value_data (const struct attribute *attr, struct obstack *obstack,
21662 struct dwarf2_cu *cu, LONGEST *value, int bits)
21664 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
21665 enum bfd_endian byte_order = bfd_big_endian (objfile->obfd) ?
21666 BFD_ENDIAN_BIG : BFD_ENDIAN_LITTLE;
21667 LONGEST l = DW_UNSND (attr);
21669 if (bits < sizeof (*value) * 8)
21671 l &= ((LONGEST) 1 << bits) - 1;
21674 else if (bits == sizeof (*value) * 8)
21678 gdb_byte *bytes = (gdb_byte *) obstack_alloc (obstack, bits / 8);
21679 store_unsigned_integer (bytes, bits / 8, byte_order, l);
21686 /* Read a constant value from an attribute. Either set *VALUE, or if
21687 the value does not fit in *VALUE, set *BYTES - either already
21688 allocated on the objfile obstack, or newly allocated on OBSTACK,
21689 or, set *BATON, if we translated the constant to a location
21693 dwarf2_const_value_attr (const struct attribute *attr, struct type *type,
21694 const char *name, struct obstack *obstack,
21695 struct dwarf2_cu *cu,
21696 LONGEST *value, const gdb_byte **bytes,
21697 struct dwarf2_locexpr_baton **baton)
21699 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
21700 struct comp_unit_head *cu_header = &cu->header;
21701 struct dwarf_block *blk;
21702 enum bfd_endian byte_order = (bfd_big_endian (objfile->obfd) ?
21703 BFD_ENDIAN_BIG : BFD_ENDIAN_LITTLE);
21709 switch (attr->form)
21712 case DW_FORM_GNU_addr_index:
21716 if (TYPE_LENGTH (type) != cu_header->addr_size)
21717 dwarf2_const_value_length_mismatch_complaint (name,
21718 cu_header->addr_size,
21719 TYPE_LENGTH (type));
21720 /* Symbols of this form are reasonably rare, so we just
21721 piggyback on the existing location code rather than writing
21722 a new implementation of symbol_computed_ops. */
21723 *baton = XOBNEW (obstack, struct dwarf2_locexpr_baton);
21724 (*baton)->per_cu = cu->per_cu;
21725 gdb_assert ((*baton)->per_cu);
21727 (*baton)->size = 2 + cu_header->addr_size;
21728 data = (gdb_byte *) obstack_alloc (obstack, (*baton)->size);
21729 (*baton)->data = data;
21731 data[0] = DW_OP_addr;
21732 store_unsigned_integer (&data[1], cu_header->addr_size,
21733 byte_order, DW_ADDR (attr));
21734 data[cu_header->addr_size + 1] = DW_OP_stack_value;
21737 case DW_FORM_string:
21739 case DW_FORM_GNU_str_index:
21740 case DW_FORM_GNU_strp_alt:
21741 /* DW_STRING is already allocated on the objfile obstack, point
21743 *bytes = (const gdb_byte *) DW_STRING (attr);
21745 case DW_FORM_block1:
21746 case DW_FORM_block2:
21747 case DW_FORM_block4:
21748 case DW_FORM_block:
21749 case DW_FORM_exprloc:
21750 case DW_FORM_data16:
21751 blk = DW_BLOCK (attr);
21752 if (TYPE_LENGTH (type) != blk->size)
21753 dwarf2_const_value_length_mismatch_complaint (name, blk->size,
21754 TYPE_LENGTH (type));
21755 *bytes = blk->data;
21758 /* The DW_AT_const_value attributes are supposed to carry the
21759 symbol's value "represented as it would be on the target
21760 architecture." By the time we get here, it's already been
21761 converted to host endianness, so we just need to sign- or
21762 zero-extend it as appropriate. */
21763 case DW_FORM_data1:
21764 *bytes = dwarf2_const_value_data (attr, obstack, cu, value, 8);
21766 case DW_FORM_data2:
21767 *bytes = dwarf2_const_value_data (attr, obstack, cu, value, 16);
21769 case DW_FORM_data4:
21770 *bytes = dwarf2_const_value_data (attr, obstack, cu, value, 32);
21772 case DW_FORM_data8:
21773 *bytes = dwarf2_const_value_data (attr, obstack, cu, value, 64);
21776 case DW_FORM_sdata:
21777 case DW_FORM_implicit_const:
21778 *value = DW_SND (attr);
21781 case DW_FORM_udata:
21782 *value = DW_UNSND (attr);
21786 complaint (&symfile_complaints,
21787 _("unsupported const value attribute form: '%s'"),
21788 dwarf_form_name (attr->form));
21795 /* Copy constant value from an attribute to a symbol. */
21798 dwarf2_const_value (const struct attribute *attr, struct symbol *sym,
21799 struct dwarf2_cu *cu)
21801 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
21803 const gdb_byte *bytes;
21804 struct dwarf2_locexpr_baton *baton;
21806 dwarf2_const_value_attr (attr, SYMBOL_TYPE (sym),
21807 SYMBOL_PRINT_NAME (sym),
21808 &objfile->objfile_obstack, cu,
21809 &value, &bytes, &baton);
21813 SYMBOL_LOCATION_BATON (sym) = baton;
21814 SYMBOL_ACLASS_INDEX (sym) = dwarf2_locexpr_index;
21816 else if (bytes != NULL)
21818 SYMBOL_VALUE_BYTES (sym) = bytes;
21819 SYMBOL_ACLASS_INDEX (sym) = LOC_CONST_BYTES;
21823 SYMBOL_VALUE (sym) = value;
21824 SYMBOL_ACLASS_INDEX (sym) = LOC_CONST;
21828 /* Return the type of the die in question using its DW_AT_type attribute. */
21830 static struct type *
21831 die_type (struct die_info *die, struct dwarf2_cu *cu)
21833 struct attribute *type_attr;
21835 type_attr = dwarf2_attr (die, DW_AT_type, cu);
21838 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
21839 /* A missing DW_AT_type represents a void type. */
21840 return objfile_type (objfile)->builtin_void;
21843 return lookup_die_type (die, type_attr, cu);
21846 /* True iff CU's producer generates GNAT Ada auxiliary information
21847 that allows to find parallel types through that information instead
21848 of having to do expensive parallel lookups by type name. */
21851 need_gnat_info (struct dwarf2_cu *cu)
21853 /* Assume that the Ada compiler was GNAT, which always produces
21854 the auxiliary information. */
21855 return (cu->language == language_ada);
21858 /* Return the auxiliary type of the die in question using its
21859 DW_AT_GNAT_descriptive_type attribute. Returns NULL if the
21860 attribute is not present. */
21862 static struct type *
21863 die_descriptive_type (struct die_info *die, struct dwarf2_cu *cu)
21865 struct attribute *type_attr;
21867 type_attr = dwarf2_attr (die, DW_AT_GNAT_descriptive_type, cu);
21871 return lookup_die_type (die, type_attr, cu);
21874 /* If DIE has a descriptive_type attribute, then set the TYPE's
21875 descriptive type accordingly. */
21878 set_descriptive_type (struct type *type, struct die_info *die,
21879 struct dwarf2_cu *cu)
21881 struct type *descriptive_type = die_descriptive_type (die, cu);
21883 if (descriptive_type)
21885 ALLOCATE_GNAT_AUX_TYPE (type);
21886 TYPE_DESCRIPTIVE_TYPE (type) = descriptive_type;
21890 /* Return the containing type of the die in question using its
21891 DW_AT_containing_type attribute. */
21893 static struct type *
21894 die_containing_type (struct die_info *die, struct dwarf2_cu *cu)
21896 struct attribute *type_attr;
21897 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
21899 type_attr = dwarf2_attr (die, DW_AT_containing_type, cu);
21901 error (_("Dwarf Error: Problem turning containing type into gdb type "
21902 "[in module %s]"), objfile_name (objfile));
21904 return lookup_die_type (die, type_attr, cu);
21907 /* Return an error marker type to use for the ill formed type in DIE/CU. */
21909 static struct type *
21910 build_error_marker_type (struct dwarf2_cu *cu, struct die_info *die)
21912 struct dwarf2_per_objfile *dwarf2_per_objfile
21913 = cu->per_cu->dwarf2_per_objfile;
21914 struct objfile *objfile = dwarf2_per_objfile->objfile;
21915 char *message, *saved;
21917 message = xstrprintf (_("<unknown type in %s, CU 0x%x, DIE 0x%x>"),
21918 objfile_name (objfile),
21919 to_underlying (cu->header.sect_off),
21920 to_underlying (die->sect_off));
21921 saved = (char *) obstack_copy0 (&objfile->objfile_obstack,
21922 message, strlen (message));
21925 return init_type (objfile, TYPE_CODE_ERROR, 0, saved);
21928 /* Look up the type of DIE in CU using its type attribute ATTR.
21929 ATTR must be one of: DW_AT_type, DW_AT_GNAT_descriptive_type,
21930 DW_AT_containing_type.
21931 If there is no type substitute an error marker. */
21933 static struct type *
21934 lookup_die_type (struct die_info *die, const struct attribute *attr,
21935 struct dwarf2_cu *cu)
21937 struct dwarf2_per_objfile *dwarf2_per_objfile
21938 = cu->per_cu->dwarf2_per_objfile;
21939 struct objfile *objfile = dwarf2_per_objfile->objfile;
21940 struct type *this_type;
21942 gdb_assert (attr->name == DW_AT_type
21943 || attr->name == DW_AT_GNAT_descriptive_type
21944 || attr->name == DW_AT_containing_type);
21946 /* First see if we have it cached. */
21948 if (attr->form == DW_FORM_GNU_ref_alt)
21950 struct dwarf2_per_cu_data *per_cu;
21951 sect_offset sect_off = dwarf2_get_ref_die_offset (attr);
21953 per_cu = dwarf2_find_containing_comp_unit (sect_off, 1,
21954 dwarf2_per_objfile);
21955 this_type = get_die_type_at_offset (sect_off, per_cu);
21957 else if (attr_form_is_ref (attr))
21959 sect_offset sect_off = dwarf2_get_ref_die_offset (attr);
21961 this_type = get_die_type_at_offset (sect_off, cu->per_cu);
21963 else if (attr->form == DW_FORM_ref_sig8)
21965 ULONGEST signature = DW_SIGNATURE (attr);
21967 return get_signatured_type (die, signature, cu);
21971 complaint (&symfile_complaints,
21972 _("Dwarf Error: Bad type attribute %s in DIE"
21973 " at 0x%x [in module %s]"),
21974 dwarf_attr_name (attr->name), to_underlying (die->sect_off),
21975 objfile_name (objfile));
21976 return build_error_marker_type (cu, die);
21979 /* If not cached we need to read it in. */
21981 if (this_type == NULL)
21983 struct die_info *type_die = NULL;
21984 struct dwarf2_cu *type_cu = cu;
21986 if (attr_form_is_ref (attr))
21987 type_die = follow_die_ref (die, attr, &type_cu);
21988 if (type_die == NULL)
21989 return build_error_marker_type (cu, die);
21990 /* If we find the type now, it's probably because the type came
21991 from an inter-CU reference and the type's CU got expanded before
21993 this_type = read_type_die (type_die, type_cu);
21996 /* If we still don't have a type use an error marker. */
21998 if (this_type == NULL)
21999 return build_error_marker_type (cu, die);
22004 /* Return the type in DIE, CU.
22005 Returns NULL for invalid types.
22007 This first does a lookup in die_type_hash,
22008 and only reads the die in if necessary.
22010 NOTE: This can be called when reading in partial or full symbols. */
22012 static struct type *
22013 read_type_die (struct die_info *die, struct dwarf2_cu *cu)
22015 struct type *this_type;
22017 this_type = get_die_type (die, cu);
22021 return read_type_die_1 (die, cu);
22024 /* Read the type in DIE, CU.
22025 Returns NULL for invalid types. */
22027 static struct type *
22028 read_type_die_1 (struct die_info *die, struct dwarf2_cu *cu)
22030 struct type *this_type = NULL;
22034 case DW_TAG_class_type:
22035 case DW_TAG_interface_type:
22036 case DW_TAG_structure_type:
22037 case DW_TAG_union_type:
22038 this_type = read_structure_type (die, cu);
22040 case DW_TAG_enumeration_type:
22041 this_type = read_enumeration_type (die, cu);
22043 case DW_TAG_subprogram:
22044 case DW_TAG_subroutine_type:
22045 case DW_TAG_inlined_subroutine:
22046 this_type = read_subroutine_type (die, cu);
22048 case DW_TAG_array_type:
22049 this_type = read_array_type (die, cu);
22051 case DW_TAG_set_type:
22052 this_type = read_set_type (die, cu);
22054 case DW_TAG_pointer_type:
22055 this_type = read_tag_pointer_type (die, cu);
22057 case DW_TAG_ptr_to_member_type:
22058 this_type = read_tag_ptr_to_member_type (die, cu);
22060 case DW_TAG_reference_type:
22061 this_type = read_tag_reference_type (die, cu, TYPE_CODE_REF);
22063 case DW_TAG_rvalue_reference_type:
22064 this_type = read_tag_reference_type (die, cu, TYPE_CODE_RVALUE_REF);
22066 case DW_TAG_const_type:
22067 this_type = read_tag_const_type (die, cu);
22069 case DW_TAG_volatile_type:
22070 this_type = read_tag_volatile_type (die, cu);
22072 case DW_TAG_restrict_type:
22073 this_type = read_tag_restrict_type (die, cu);
22075 case DW_TAG_string_type:
22076 this_type = read_tag_string_type (die, cu);
22078 case DW_TAG_typedef:
22079 this_type = read_typedef (die, cu);
22081 case DW_TAG_subrange_type:
22082 this_type = read_subrange_type (die, cu);
22084 case DW_TAG_base_type:
22085 this_type = read_base_type (die, cu);
22087 case DW_TAG_unspecified_type:
22088 this_type = read_unspecified_type (die, cu);
22090 case DW_TAG_namespace:
22091 this_type = read_namespace_type (die, cu);
22093 case DW_TAG_module:
22094 this_type = read_module_type (die, cu);
22096 case DW_TAG_atomic_type:
22097 this_type = read_tag_atomic_type (die, cu);
22100 complaint (&symfile_complaints,
22101 _("unexpected tag in read_type_die: '%s'"),
22102 dwarf_tag_name (die->tag));
22109 /* See if we can figure out if the class lives in a namespace. We do
22110 this by looking for a member function; its demangled name will
22111 contain namespace info, if there is any.
22112 Return the computed name or NULL.
22113 Space for the result is allocated on the objfile's obstack.
22114 This is the full-die version of guess_partial_die_structure_name.
22115 In this case we know DIE has no useful parent. */
22118 guess_full_die_structure_name (struct die_info *die, struct dwarf2_cu *cu)
22120 struct die_info *spec_die;
22121 struct dwarf2_cu *spec_cu;
22122 struct die_info *child;
22123 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
22126 spec_die = die_specification (die, &spec_cu);
22127 if (spec_die != NULL)
22133 for (child = die->child;
22135 child = child->sibling)
22137 if (child->tag == DW_TAG_subprogram)
22139 const char *linkage_name = dw2_linkage_name (child, cu);
22141 if (linkage_name != NULL)
22144 = language_class_name_from_physname (cu->language_defn,
22148 if (actual_name != NULL)
22150 const char *die_name = dwarf2_name (die, cu);
22152 if (die_name != NULL
22153 && strcmp (die_name, actual_name) != 0)
22155 /* Strip off the class name from the full name.
22156 We want the prefix. */
22157 int die_name_len = strlen (die_name);
22158 int actual_name_len = strlen (actual_name);
22160 /* Test for '::' as a sanity check. */
22161 if (actual_name_len > die_name_len + 2
22162 && actual_name[actual_name_len
22163 - die_name_len - 1] == ':')
22164 name = (char *) obstack_copy0 (
22165 &objfile->per_bfd->storage_obstack,
22166 actual_name, actual_name_len - die_name_len - 2);
22169 xfree (actual_name);
22178 /* GCC might emit a nameless typedef that has a linkage name. Determine the
22179 prefix part in such case. See
22180 http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47510. */
22182 static const char *
22183 anonymous_struct_prefix (struct die_info *die, struct dwarf2_cu *cu)
22185 struct attribute *attr;
22188 if (die->tag != DW_TAG_class_type && die->tag != DW_TAG_interface_type
22189 && die->tag != DW_TAG_structure_type && die->tag != DW_TAG_union_type)
22192 if (dwarf2_string_attr (die, DW_AT_name, cu) != NULL)
22195 attr = dw2_linkage_name_attr (die, cu);
22196 if (attr == NULL || DW_STRING (attr) == NULL)
22199 /* dwarf2_name had to be already called. */
22200 gdb_assert (DW_STRING_IS_CANONICAL (attr));
22202 /* Strip the base name, keep any leading namespaces/classes. */
22203 base = strrchr (DW_STRING (attr), ':');
22204 if (base == NULL || base == DW_STRING (attr) || base[-1] != ':')
22207 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
22208 return (char *) obstack_copy0 (&objfile->per_bfd->storage_obstack,
22210 &base[-1] - DW_STRING (attr));
22213 /* Return the name of the namespace/class that DIE is defined within,
22214 or "" if we can't tell. The caller should not xfree the result.
22216 For example, if we're within the method foo() in the following
22226 then determine_prefix on foo's die will return "N::C". */
22228 static const char *
22229 determine_prefix (struct die_info *die, struct dwarf2_cu *cu)
22231 struct dwarf2_per_objfile *dwarf2_per_objfile
22232 = cu->per_cu->dwarf2_per_objfile;
22233 struct die_info *parent, *spec_die;
22234 struct dwarf2_cu *spec_cu;
22235 struct type *parent_type;
22236 const char *retval;
22238 if (cu->language != language_cplus
22239 && cu->language != language_fortran && cu->language != language_d
22240 && cu->language != language_rust)
22243 retval = anonymous_struct_prefix (die, cu);
22247 /* We have to be careful in the presence of DW_AT_specification.
22248 For example, with GCC 3.4, given the code
22252 // Definition of N::foo.
22256 then we'll have a tree of DIEs like this:
22258 1: DW_TAG_compile_unit
22259 2: DW_TAG_namespace // N
22260 3: DW_TAG_subprogram // declaration of N::foo
22261 4: DW_TAG_subprogram // definition of N::foo
22262 DW_AT_specification // refers to die #3
22264 Thus, when processing die #4, we have to pretend that we're in
22265 the context of its DW_AT_specification, namely the contex of die
22268 spec_die = die_specification (die, &spec_cu);
22269 if (spec_die == NULL)
22270 parent = die->parent;
22273 parent = spec_die->parent;
22277 if (parent == NULL)
22279 else if (parent->building_fullname)
22282 const char *parent_name;
22284 /* It has been seen on RealView 2.2 built binaries,
22285 DW_TAG_template_type_param types actually _defined_ as
22286 children of the parent class:
22289 template class <class Enum> Class{};
22290 Class<enum E> class_e;
22292 1: DW_TAG_class_type (Class)
22293 2: DW_TAG_enumeration_type (E)
22294 3: DW_TAG_enumerator (enum1:0)
22295 3: DW_TAG_enumerator (enum2:1)
22297 2: DW_TAG_template_type_param
22298 DW_AT_type DW_FORM_ref_udata (E)
22300 Besides being broken debug info, it can put GDB into an
22301 infinite loop. Consider:
22303 When we're building the full name for Class<E>, we'll start
22304 at Class, and go look over its template type parameters,
22305 finding E. We'll then try to build the full name of E, and
22306 reach here. We're now trying to build the full name of E,
22307 and look over the parent DIE for containing scope. In the
22308 broken case, if we followed the parent DIE of E, we'd again
22309 find Class, and once again go look at its template type
22310 arguments, etc., etc. Simply don't consider such parent die
22311 as source-level parent of this die (it can't be, the language
22312 doesn't allow it), and break the loop here. */
22313 name = dwarf2_name (die, cu);
22314 parent_name = dwarf2_name (parent, cu);
22315 complaint (&symfile_complaints,
22316 _("template param type '%s' defined within parent '%s'"),
22317 name ? name : "<unknown>",
22318 parent_name ? parent_name : "<unknown>");
22322 switch (parent->tag)
22324 case DW_TAG_namespace:
22325 parent_type = read_type_die (parent, cu);
22326 /* GCC 4.0 and 4.1 had a bug (PR c++/28460) where they generated bogus
22327 DW_TAG_namespace DIEs with a name of "::" for the global namespace.
22328 Work around this problem here. */
22329 if (cu->language == language_cplus
22330 && strcmp (TYPE_TAG_NAME (parent_type), "::") == 0)
22332 /* We give a name to even anonymous namespaces. */
22333 return TYPE_TAG_NAME (parent_type);
22334 case DW_TAG_class_type:
22335 case DW_TAG_interface_type:
22336 case DW_TAG_structure_type:
22337 case DW_TAG_union_type:
22338 case DW_TAG_module:
22339 parent_type = read_type_die (parent, cu);
22340 if (TYPE_TAG_NAME (parent_type) != NULL)
22341 return TYPE_TAG_NAME (parent_type);
22343 /* An anonymous structure is only allowed non-static data
22344 members; no typedefs, no member functions, et cetera.
22345 So it does not need a prefix. */
22347 case DW_TAG_compile_unit:
22348 case DW_TAG_partial_unit:
22349 /* gcc-4.5 -gdwarf-4 can drop the enclosing namespace. Cope. */
22350 if (cu->language == language_cplus
22351 && !VEC_empty (dwarf2_section_info_def, dwarf2_per_objfile->types)
22352 && die->child != NULL
22353 && (die->tag == DW_TAG_class_type
22354 || die->tag == DW_TAG_structure_type
22355 || die->tag == DW_TAG_union_type))
22357 char *name = guess_full_die_structure_name (die, cu);
22362 case DW_TAG_enumeration_type:
22363 parent_type = read_type_die (parent, cu);
22364 if (TYPE_DECLARED_CLASS (parent_type))
22366 if (TYPE_TAG_NAME (parent_type) != NULL)
22367 return TYPE_TAG_NAME (parent_type);
22370 /* Fall through. */
22372 return determine_prefix (parent, cu);
22376 /* Return a newly-allocated string formed by concatenating PREFIX and SUFFIX
22377 with appropriate separator. If PREFIX or SUFFIX is NULL or empty, then
22378 simply copy the SUFFIX or PREFIX, respectively. If OBS is non-null, perform
22379 an obconcat, otherwise allocate storage for the result. The CU argument is
22380 used to determine the language and hence, the appropriate separator. */
22382 #define MAX_SEP_LEN 7 /* strlen ("__") + strlen ("_MOD_") */
22385 typename_concat (struct obstack *obs, const char *prefix, const char *suffix,
22386 int physname, struct dwarf2_cu *cu)
22388 const char *lead = "";
22391 if (suffix == NULL || suffix[0] == '\0'
22392 || prefix == NULL || prefix[0] == '\0')
22394 else if (cu->language == language_d)
22396 /* For D, the 'main' function could be defined in any module, but it
22397 should never be prefixed. */
22398 if (strcmp (suffix, "D main") == 0)
22406 else if (cu->language == language_fortran && physname)
22408 /* This is gfortran specific mangling. Normally DW_AT_linkage_name or
22409 DW_AT_MIPS_linkage_name is preferred and used instead. */
22417 if (prefix == NULL)
22419 if (suffix == NULL)
22426 xmalloc (strlen (prefix) + MAX_SEP_LEN + strlen (suffix) + 1));
22428 strcpy (retval, lead);
22429 strcat (retval, prefix);
22430 strcat (retval, sep);
22431 strcat (retval, suffix);
22436 /* We have an obstack. */
22437 return obconcat (obs, lead, prefix, sep, suffix, (char *) NULL);
22441 /* Return sibling of die, NULL if no sibling. */
22443 static struct die_info *
22444 sibling_die (struct die_info *die)
22446 return die->sibling;
22449 /* Get name of a die, return NULL if not found. */
22451 static const char *
22452 dwarf2_canonicalize_name (const char *name, struct dwarf2_cu *cu,
22453 struct obstack *obstack)
22455 if (name && cu->language == language_cplus)
22457 std::string canon_name = cp_canonicalize_string (name);
22459 if (!canon_name.empty ())
22461 if (canon_name != name)
22462 name = (const char *) obstack_copy0 (obstack,
22463 canon_name.c_str (),
22464 canon_name.length ());
22471 /* Get name of a die, return NULL if not found.
22472 Anonymous namespaces are converted to their magic string. */
22474 static const char *
22475 dwarf2_name (struct die_info *die, struct dwarf2_cu *cu)
22477 struct attribute *attr;
22478 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
22480 attr = dwarf2_attr (die, DW_AT_name, cu);
22481 if ((!attr || !DW_STRING (attr))
22482 && die->tag != DW_TAG_namespace
22483 && die->tag != DW_TAG_class_type
22484 && die->tag != DW_TAG_interface_type
22485 && die->tag != DW_TAG_structure_type
22486 && die->tag != DW_TAG_union_type)
22491 case DW_TAG_compile_unit:
22492 case DW_TAG_partial_unit:
22493 /* Compilation units have a DW_AT_name that is a filename, not
22494 a source language identifier. */
22495 case DW_TAG_enumeration_type:
22496 case DW_TAG_enumerator:
22497 /* These tags always have simple identifiers already; no need
22498 to canonicalize them. */
22499 return DW_STRING (attr);
22501 case DW_TAG_namespace:
22502 if (attr != NULL && DW_STRING (attr) != NULL)
22503 return DW_STRING (attr);
22504 return CP_ANONYMOUS_NAMESPACE_STR;
22506 case DW_TAG_class_type:
22507 case DW_TAG_interface_type:
22508 case DW_TAG_structure_type:
22509 case DW_TAG_union_type:
22510 /* Some GCC versions emit spurious DW_AT_name attributes for unnamed
22511 structures or unions. These were of the form "._%d" in GCC 4.1,
22512 or simply "<anonymous struct>" or "<anonymous union>" in GCC 4.3
22513 and GCC 4.4. We work around this problem by ignoring these. */
22514 if (attr && DW_STRING (attr)
22515 && (startswith (DW_STRING (attr), "._")
22516 || startswith (DW_STRING (attr), "<anonymous")))
22519 /* GCC might emit a nameless typedef that has a linkage name. See
22520 http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47510. */
22521 if (!attr || DW_STRING (attr) == NULL)
22523 char *demangled = NULL;
22525 attr = dw2_linkage_name_attr (die, cu);
22526 if (attr == NULL || DW_STRING (attr) == NULL)
22529 /* Avoid demangling DW_STRING (attr) the second time on a second
22530 call for the same DIE. */
22531 if (!DW_STRING_IS_CANONICAL (attr))
22532 demangled = gdb_demangle (DW_STRING (attr), DMGL_TYPES);
22538 /* FIXME: we already did this for the partial symbol... */
22541 obstack_copy0 (&objfile->per_bfd->storage_obstack,
22542 demangled, strlen (demangled)));
22543 DW_STRING_IS_CANONICAL (attr) = 1;
22546 /* Strip any leading namespaces/classes, keep only the base name.
22547 DW_AT_name for named DIEs does not contain the prefixes. */
22548 base = strrchr (DW_STRING (attr), ':');
22549 if (base && base > DW_STRING (attr) && base[-1] == ':')
22552 return DW_STRING (attr);
22561 if (!DW_STRING_IS_CANONICAL (attr))
22564 = dwarf2_canonicalize_name (DW_STRING (attr), cu,
22565 &objfile->per_bfd->storage_obstack);
22566 DW_STRING_IS_CANONICAL (attr) = 1;
22568 return DW_STRING (attr);
22571 /* Return the die that this die in an extension of, or NULL if there
22572 is none. *EXT_CU is the CU containing DIE on input, and the CU
22573 containing the return value on output. */
22575 static struct die_info *
22576 dwarf2_extension (struct die_info *die, struct dwarf2_cu **ext_cu)
22578 struct attribute *attr;
22580 attr = dwarf2_attr (die, DW_AT_extension, *ext_cu);
22584 return follow_die_ref (die, attr, ext_cu);
22587 /* Convert a DIE tag into its string name. */
22589 static const char *
22590 dwarf_tag_name (unsigned tag)
22592 const char *name = get_DW_TAG_name (tag);
22595 return "DW_TAG_<unknown>";
22600 /* Convert a DWARF attribute code into its string name. */
22602 static const char *
22603 dwarf_attr_name (unsigned attr)
22607 #ifdef MIPS /* collides with DW_AT_HP_block_index */
22608 if (attr == DW_AT_MIPS_fde)
22609 return "DW_AT_MIPS_fde";
22611 if (attr == DW_AT_HP_block_index)
22612 return "DW_AT_HP_block_index";
22615 name = get_DW_AT_name (attr);
22618 return "DW_AT_<unknown>";
22623 /* Convert a DWARF value form code into its string name. */
22625 static const char *
22626 dwarf_form_name (unsigned form)
22628 const char *name = get_DW_FORM_name (form);
22631 return "DW_FORM_<unknown>";
22636 static const char *
22637 dwarf_bool_name (unsigned mybool)
22645 /* Convert a DWARF type code into its string name. */
22647 static const char *
22648 dwarf_type_encoding_name (unsigned enc)
22650 const char *name = get_DW_ATE_name (enc);
22653 return "DW_ATE_<unknown>";
22659 dump_die_shallow (struct ui_file *f, int indent, struct die_info *die)
22663 print_spaces (indent, f);
22664 fprintf_unfiltered (f, "Die: %s (abbrev %d, offset 0x%x)\n",
22665 dwarf_tag_name (die->tag), die->abbrev,
22666 to_underlying (die->sect_off));
22668 if (die->parent != NULL)
22670 print_spaces (indent, f);
22671 fprintf_unfiltered (f, " parent at offset: 0x%x\n",
22672 to_underlying (die->parent->sect_off));
22675 print_spaces (indent, f);
22676 fprintf_unfiltered (f, " has children: %s\n",
22677 dwarf_bool_name (die->child != NULL));
22679 print_spaces (indent, f);
22680 fprintf_unfiltered (f, " attributes:\n");
22682 for (i = 0; i < die->num_attrs; ++i)
22684 print_spaces (indent, f);
22685 fprintf_unfiltered (f, " %s (%s) ",
22686 dwarf_attr_name (die->attrs[i].name),
22687 dwarf_form_name (die->attrs[i].form));
22689 switch (die->attrs[i].form)
22692 case DW_FORM_GNU_addr_index:
22693 fprintf_unfiltered (f, "address: ");
22694 fputs_filtered (hex_string (DW_ADDR (&die->attrs[i])), f);
22696 case DW_FORM_block2:
22697 case DW_FORM_block4:
22698 case DW_FORM_block:
22699 case DW_FORM_block1:
22700 fprintf_unfiltered (f, "block: size %s",
22701 pulongest (DW_BLOCK (&die->attrs[i])->size));
22703 case DW_FORM_exprloc:
22704 fprintf_unfiltered (f, "expression: size %s",
22705 pulongest (DW_BLOCK (&die->attrs[i])->size));
22707 case DW_FORM_data16:
22708 fprintf_unfiltered (f, "constant of 16 bytes");
22710 case DW_FORM_ref_addr:
22711 fprintf_unfiltered (f, "ref address: ");
22712 fputs_filtered (hex_string (DW_UNSND (&die->attrs[i])), f);
22714 case DW_FORM_GNU_ref_alt:
22715 fprintf_unfiltered (f, "alt ref address: ");
22716 fputs_filtered (hex_string (DW_UNSND (&die->attrs[i])), f);
22722 case DW_FORM_ref_udata:
22723 fprintf_unfiltered (f, "constant ref: 0x%lx (adjusted)",
22724 (long) (DW_UNSND (&die->attrs[i])));
22726 case DW_FORM_data1:
22727 case DW_FORM_data2:
22728 case DW_FORM_data4:
22729 case DW_FORM_data8:
22730 case DW_FORM_udata:
22731 case DW_FORM_sdata:
22732 fprintf_unfiltered (f, "constant: %s",
22733 pulongest (DW_UNSND (&die->attrs[i])));
22735 case DW_FORM_sec_offset:
22736 fprintf_unfiltered (f, "section offset: %s",
22737 pulongest (DW_UNSND (&die->attrs[i])));
22739 case DW_FORM_ref_sig8:
22740 fprintf_unfiltered (f, "signature: %s",
22741 hex_string (DW_SIGNATURE (&die->attrs[i])));
22743 case DW_FORM_string:
22745 case DW_FORM_line_strp:
22746 case DW_FORM_GNU_str_index:
22747 case DW_FORM_GNU_strp_alt:
22748 fprintf_unfiltered (f, "string: \"%s\" (%s canonicalized)",
22749 DW_STRING (&die->attrs[i])
22750 ? DW_STRING (&die->attrs[i]) : "",
22751 DW_STRING_IS_CANONICAL (&die->attrs[i]) ? "is" : "not");
22754 if (DW_UNSND (&die->attrs[i]))
22755 fprintf_unfiltered (f, "flag: TRUE");
22757 fprintf_unfiltered (f, "flag: FALSE");
22759 case DW_FORM_flag_present:
22760 fprintf_unfiltered (f, "flag: TRUE");
22762 case DW_FORM_indirect:
22763 /* The reader will have reduced the indirect form to
22764 the "base form" so this form should not occur. */
22765 fprintf_unfiltered (f,
22766 "unexpected attribute form: DW_FORM_indirect");
22768 case DW_FORM_implicit_const:
22769 fprintf_unfiltered (f, "constant: %s",
22770 plongest (DW_SND (&die->attrs[i])));
22773 fprintf_unfiltered (f, "unsupported attribute form: %d.",
22774 die->attrs[i].form);
22777 fprintf_unfiltered (f, "\n");
22782 dump_die_for_error (struct die_info *die)
22784 dump_die_shallow (gdb_stderr, 0, die);
22788 dump_die_1 (struct ui_file *f, int level, int max_level, struct die_info *die)
22790 int indent = level * 4;
22792 gdb_assert (die != NULL);
22794 if (level >= max_level)
22797 dump_die_shallow (f, indent, die);
22799 if (die->child != NULL)
22801 print_spaces (indent, f);
22802 fprintf_unfiltered (f, " Children:");
22803 if (level + 1 < max_level)
22805 fprintf_unfiltered (f, "\n");
22806 dump_die_1 (f, level + 1, max_level, die->child);
22810 fprintf_unfiltered (f,
22811 " [not printed, max nesting level reached]\n");
22815 if (die->sibling != NULL && level > 0)
22817 dump_die_1 (f, level, max_level, die->sibling);
22821 /* This is called from the pdie macro in gdbinit.in.
22822 It's not static so gcc will keep a copy callable from gdb. */
22825 dump_die (struct die_info *die, int max_level)
22827 dump_die_1 (gdb_stdlog, 0, max_level, die);
22831 store_in_ref_table (struct die_info *die, struct dwarf2_cu *cu)
22835 slot = htab_find_slot_with_hash (cu->die_hash, die,
22836 to_underlying (die->sect_off),
22842 /* Return DIE offset of ATTR. Return 0 with complaint if ATTR is not of the
22846 dwarf2_get_ref_die_offset (const struct attribute *attr)
22848 if (attr_form_is_ref (attr))
22849 return (sect_offset) DW_UNSND (attr);
22851 complaint (&symfile_complaints,
22852 _("unsupported die ref attribute form: '%s'"),
22853 dwarf_form_name (attr->form));
22857 /* Return the constant value held by ATTR. Return DEFAULT_VALUE if
22858 * the value held by the attribute is not constant. */
22861 dwarf2_get_attr_constant_value (const struct attribute *attr, int default_value)
22863 if (attr->form == DW_FORM_sdata || attr->form == DW_FORM_implicit_const)
22864 return DW_SND (attr);
22865 else if (attr->form == DW_FORM_udata
22866 || attr->form == DW_FORM_data1
22867 || attr->form == DW_FORM_data2
22868 || attr->form == DW_FORM_data4
22869 || attr->form == DW_FORM_data8)
22870 return DW_UNSND (attr);
22873 /* For DW_FORM_data16 see attr_form_is_constant. */
22874 complaint (&symfile_complaints,
22875 _("Attribute value is not a constant (%s)"),
22876 dwarf_form_name (attr->form));
22877 return default_value;
22881 /* Follow reference or signature attribute ATTR of SRC_DIE.
22882 On entry *REF_CU is the CU of SRC_DIE.
22883 On exit *REF_CU is the CU of the result. */
22885 static struct die_info *
22886 follow_die_ref_or_sig (struct die_info *src_die, const struct attribute *attr,
22887 struct dwarf2_cu **ref_cu)
22889 struct die_info *die;
22891 if (attr_form_is_ref (attr))
22892 die = follow_die_ref (src_die, attr, ref_cu);
22893 else if (attr->form == DW_FORM_ref_sig8)
22894 die = follow_die_sig (src_die, attr, ref_cu);
22897 dump_die_for_error (src_die);
22898 error (_("Dwarf Error: Expected reference attribute [in module %s]"),
22899 objfile_name ((*ref_cu)->per_cu->dwarf2_per_objfile->objfile));
22905 /* Follow reference OFFSET.
22906 On entry *REF_CU is the CU of the source die referencing OFFSET.
22907 On exit *REF_CU is the CU of the result.
22908 Returns NULL if OFFSET is invalid. */
22910 static struct die_info *
22911 follow_die_offset (sect_offset sect_off, int offset_in_dwz,
22912 struct dwarf2_cu **ref_cu)
22914 struct die_info temp_die;
22915 struct dwarf2_cu *target_cu, *cu = *ref_cu;
22916 struct dwarf2_per_objfile *dwarf2_per_objfile
22917 = cu->per_cu->dwarf2_per_objfile;
22918 struct objfile *objfile = dwarf2_per_objfile->objfile;
22920 gdb_assert (cu->per_cu != NULL);
22924 if (cu->per_cu->is_debug_types)
22926 /* .debug_types CUs cannot reference anything outside their CU.
22927 If they need to, they have to reference a signatured type via
22928 DW_FORM_ref_sig8. */
22929 if (!offset_in_cu_p (&cu->header, sect_off))
22932 else if (offset_in_dwz != cu->per_cu->is_dwz
22933 || !offset_in_cu_p (&cu->header, sect_off))
22935 struct dwarf2_per_cu_data *per_cu;
22937 per_cu = dwarf2_find_containing_comp_unit (sect_off, offset_in_dwz,
22938 dwarf2_per_objfile);
22940 /* If necessary, add it to the queue and load its DIEs. */
22941 if (maybe_queue_comp_unit (cu, per_cu, cu->language))
22942 load_full_comp_unit (per_cu, cu->language);
22944 target_cu = per_cu->cu;
22946 else if (cu->dies == NULL)
22948 /* We're loading full DIEs during partial symbol reading. */
22949 gdb_assert (dwarf2_per_objfile->reading_partial_symbols);
22950 load_full_comp_unit (cu->per_cu, language_minimal);
22953 *ref_cu = target_cu;
22954 temp_die.sect_off = sect_off;
22955 return (struct die_info *) htab_find_with_hash (target_cu->die_hash,
22957 to_underlying (sect_off));
22960 /* Follow reference attribute ATTR of SRC_DIE.
22961 On entry *REF_CU is the CU of SRC_DIE.
22962 On exit *REF_CU is the CU of the result. */
22964 static struct die_info *
22965 follow_die_ref (struct die_info *src_die, const struct attribute *attr,
22966 struct dwarf2_cu **ref_cu)
22968 sect_offset sect_off = dwarf2_get_ref_die_offset (attr);
22969 struct dwarf2_cu *cu = *ref_cu;
22970 struct die_info *die;
22972 die = follow_die_offset (sect_off,
22973 (attr->form == DW_FORM_GNU_ref_alt
22974 || cu->per_cu->is_dwz),
22977 error (_("Dwarf Error: Cannot find DIE at 0x%x referenced from DIE "
22978 "at 0x%x [in module %s]"),
22979 to_underlying (sect_off), to_underlying (src_die->sect_off),
22980 objfile_name (cu->per_cu->dwarf2_per_objfile->objfile));
22985 /* Return DWARF block referenced by DW_AT_location of DIE at SECT_OFF at PER_CU.
22986 Returned value is intended for DW_OP_call*. Returned
22987 dwarf2_locexpr_baton->data has lifetime of
22988 PER_CU->DWARF2_PER_OBJFILE->OBJFILE. */
22990 struct dwarf2_locexpr_baton
22991 dwarf2_fetch_die_loc_sect_off (sect_offset sect_off,
22992 struct dwarf2_per_cu_data *per_cu,
22993 CORE_ADDR (*get_frame_pc) (void *baton),
22996 struct dwarf2_cu *cu;
22997 struct die_info *die;
22998 struct attribute *attr;
22999 struct dwarf2_locexpr_baton retval;
23000 struct objfile *objfile = per_cu->dwarf2_per_objfile->objfile;
23001 struct dwarf2_per_objfile *dwarf2_per_objfile
23002 = get_dwarf2_per_objfile (objfile);
23004 if (per_cu->cu == NULL)
23009 /* We shouldn't get here for a dummy CU, but don't crash on the user.
23010 Instead just throw an error, not much else we can do. */
23011 error (_("Dwarf Error: Dummy CU at 0x%x referenced in module %s"),
23012 to_underlying (sect_off), objfile_name (objfile));
23015 die = follow_die_offset (sect_off, per_cu->is_dwz, &cu);
23017 error (_("Dwarf Error: Cannot find DIE at 0x%x referenced in module %s"),
23018 to_underlying (sect_off), objfile_name (objfile));
23020 attr = dwarf2_attr (die, DW_AT_location, cu);
23023 /* DWARF: "If there is no such attribute, then there is no effect.".
23024 DATA is ignored if SIZE is 0. */
23026 retval.data = NULL;
23029 else if (attr_form_is_section_offset (attr))
23031 struct dwarf2_loclist_baton loclist_baton;
23032 CORE_ADDR pc = (*get_frame_pc) (baton);
23035 fill_in_loclist_baton (cu, &loclist_baton, attr);
23037 retval.data = dwarf2_find_location_expression (&loclist_baton,
23039 retval.size = size;
23043 if (!attr_form_is_block (attr))
23044 error (_("Dwarf Error: DIE at 0x%x referenced in module %s "
23045 "is neither DW_FORM_block* nor DW_FORM_exprloc"),
23046 to_underlying (sect_off), objfile_name (objfile));
23048 retval.data = DW_BLOCK (attr)->data;
23049 retval.size = DW_BLOCK (attr)->size;
23051 retval.per_cu = cu->per_cu;
23053 age_cached_comp_units (dwarf2_per_objfile);
23058 /* Like dwarf2_fetch_die_loc_sect_off, but take a CU
23061 struct dwarf2_locexpr_baton
23062 dwarf2_fetch_die_loc_cu_off (cu_offset offset_in_cu,
23063 struct dwarf2_per_cu_data *per_cu,
23064 CORE_ADDR (*get_frame_pc) (void *baton),
23067 sect_offset sect_off = per_cu->sect_off + to_underlying (offset_in_cu);
23069 return dwarf2_fetch_die_loc_sect_off (sect_off, per_cu, get_frame_pc, baton);
23072 /* Write a constant of a given type as target-ordered bytes into
23075 static const gdb_byte *
23076 write_constant_as_bytes (struct obstack *obstack,
23077 enum bfd_endian byte_order,
23084 *len = TYPE_LENGTH (type);
23085 result = (gdb_byte *) obstack_alloc (obstack, *len);
23086 store_unsigned_integer (result, *len, byte_order, value);
23091 /* If the DIE at OFFSET in PER_CU has a DW_AT_const_value, return a
23092 pointer to the constant bytes and set LEN to the length of the
23093 data. If memory is needed, allocate it on OBSTACK. If the DIE
23094 does not have a DW_AT_const_value, return NULL. */
23097 dwarf2_fetch_constant_bytes (sect_offset sect_off,
23098 struct dwarf2_per_cu_data *per_cu,
23099 struct obstack *obstack,
23102 struct dwarf2_cu *cu;
23103 struct die_info *die;
23104 struct attribute *attr;
23105 const gdb_byte *result = NULL;
23108 enum bfd_endian byte_order;
23109 struct objfile *objfile = per_cu->dwarf2_per_objfile->objfile;
23111 if (per_cu->cu == NULL)
23116 /* We shouldn't get here for a dummy CU, but don't crash on the user.
23117 Instead just throw an error, not much else we can do. */
23118 error (_("Dwarf Error: Dummy CU at 0x%x referenced in module %s"),
23119 to_underlying (sect_off), objfile_name (objfile));
23122 die = follow_die_offset (sect_off, per_cu->is_dwz, &cu);
23124 error (_("Dwarf Error: Cannot find DIE at 0x%x referenced in module %s"),
23125 to_underlying (sect_off), objfile_name (objfile));
23128 attr = dwarf2_attr (die, DW_AT_const_value, cu);
23132 byte_order = (bfd_big_endian (objfile->obfd)
23133 ? BFD_ENDIAN_BIG : BFD_ENDIAN_LITTLE);
23135 switch (attr->form)
23138 case DW_FORM_GNU_addr_index:
23142 *len = cu->header.addr_size;
23143 tem = (gdb_byte *) obstack_alloc (obstack, *len);
23144 store_unsigned_integer (tem, *len, byte_order, DW_ADDR (attr));
23148 case DW_FORM_string:
23150 case DW_FORM_GNU_str_index:
23151 case DW_FORM_GNU_strp_alt:
23152 /* DW_STRING is already allocated on the objfile obstack, point
23154 result = (const gdb_byte *) DW_STRING (attr);
23155 *len = strlen (DW_STRING (attr));
23157 case DW_FORM_block1:
23158 case DW_FORM_block2:
23159 case DW_FORM_block4:
23160 case DW_FORM_block:
23161 case DW_FORM_exprloc:
23162 case DW_FORM_data16:
23163 result = DW_BLOCK (attr)->data;
23164 *len = DW_BLOCK (attr)->size;
23167 /* The DW_AT_const_value attributes are supposed to carry the
23168 symbol's value "represented as it would be on the target
23169 architecture." By the time we get here, it's already been
23170 converted to host endianness, so we just need to sign- or
23171 zero-extend it as appropriate. */
23172 case DW_FORM_data1:
23173 type = die_type (die, cu);
23174 result = dwarf2_const_value_data (attr, obstack, cu, &value, 8);
23175 if (result == NULL)
23176 result = write_constant_as_bytes (obstack, byte_order,
23179 case DW_FORM_data2:
23180 type = die_type (die, cu);
23181 result = dwarf2_const_value_data (attr, obstack, cu, &value, 16);
23182 if (result == NULL)
23183 result = write_constant_as_bytes (obstack, byte_order,
23186 case DW_FORM_data4:
23187 type = die_type (die, cu);
23188 result = dwarf2_const_value_data (attr, obstack, cu, &value, 32);
23189 if (result == NULL)
23190 result = write_constant_as_bytes (obstack, byte_order,
23193 case DW_FORM_data8:
23194 type = die_type (die, cu);
23195 result = dwarf2_const_value_data (attr, obstack, cu, &value, 64);
23196 if (result == NULL)
23197 result = write_constant_as_bytes (obstack, byte_order,
23201 case DW_FORM_sdata:
23202 case DW_FORM_implicit_const:
23203 type = die_type (die, cu);
23204 result = write_constant_as_bytes (obstack, byte_order,
23205 type, DW_SND (attr), len);
23208 case DW_FORM_udata:
23209 type = die_type (die, cu);
23210 result = write_constant_as_bytes (obstack, byte_order,
23211 type, DW_UNSND (attr), len);
23215 complaint (&symfile_complaints,
23216 _("unsupported const value attribute form: '%s'"),
23217 dwarf_form_name (attr->form));
23224 /* Return the type of the die at OFFSET in PER_CU. Return NULL if no
23225 valid type for this die is found. */
23228 dwarf2_fetch_die_type_sect_off (sect_offset sect_off,
23229 struct dwarf2_per_cu_data *per_cu)
23231 struct dwarf2_cu *cu;
23232 struct die_info *die;
23234 if (per_cu->cu == NULL)
23240 die = follow_die_offset (sect_off, per_cu->is_dwz, &cu);
23244 return die_type (die, cu);
23247 /* Return the type of the DIE at DIE_OFFSET in the CU named by
23251 dwarf2_get_die_type (cu_offset die_offset,
23252 struct dwarf2_per_cu_data *per_cu)
23254 sect_offset die_offset_sect = per_cu->sect_off + to_underlying (die_offset);
23255 return get_die_type_at_offset (die_offset_sect, per_cu);
23258 /* Follow type unit SIG_TYPE referenced by SRC_DIE.
23259 On entry *REF_CU is the CU of SRC_DIE.
23260 On exit *REF_CU is the CU of the result.
23261 Returns NULL if the referenced DIE isn't found. */
23263 static struct die_info *
23264 follow_die_sig_1 (struct die_info *src_die, struct signatured_type *sig_type,
23265 struct dwarf2_cu **ref_cu)
23267 struct die_info temp_die;
23268 struct dwarf2_cu *sig_cu;
23269 struct die_info *die;
23271 /* While it might be nice to assert sig_type->type == NULL here,
23272 we can get here for DW_AT_imported_declaration where we need
23273 the DIE not the type. */
23275 /* If necessary, add it to the queue and load its DIEs. */
23277 if (maybe_queue_comp_unit (*ref_cu, &sig_type->per_cu, language_minimal))
23278 read_signatured_type (sig_type);
23280 sig_cu = sig_type->per_cu.cu;
23281 gdb_assert (sig_cu != NULL);
23282 gdb_assert (to_underlying (sig_type->type_offset_in_section) != 0);
23283 temp_die.sect_off = sig_type->type_offset_in_section;
23284 die = (struct die_info *) htab_find_with_hash (sig_cu->die_hash, &temp_die,
23285 to_underlying (temp_die.sect_off));
23288 struct dwarf2_per_objfile *dwarf2_per_objfile
23289 = (*ref_cu)->per_cu->dwarf2_per_objfile;
23291 /* For .gdb_index version 7 keep track of included TUs.
23292 http://sourceware.org/bugzilla/show_bug.cgi?id=15021. */
23293 if (dwarf2_per_objfile->index_table != NULL
23294 && dwarf2_per_objfile->index_table->version <= 7)
23296 VEC_safe_push (dwarf2_per_cu_ptr,
23297 (*ref_cu)->per_cu->imported_symtabs,
23308 /* Follow signatured type referenced by ATTR in SRC_DIE.
23309 On entry *REF_CU is the CU of SRC_DIE.
23310 On exit *REF_CU is the CU of the result.
23311 The result is the DIE of the type.
23312 If the referenced type cannot be found an error is thrown. */
23314 static struct die_info *
23315 follow_die_sig (struct die_info *src_die, const struct attribute *attr,
23316 struct dwarf2_cu **ref_cu)
23318 ULONGEST signature = DW_SIGNATURE (attr);
23319 struct signatured_type *sig_type;
23320 struct die_info *die;
23322 gdb_assert (attr->form == DW_FORM_ref_sig8);
23324 sig_type = lookup_signatured_type (*ref_cu, signature);
23325 /* sig_type will be NULL if the signatured type is missing from
23327 if (sig_type == NULL)
23329 error (_("Dwarf Error: Cannot find signatured DIE %s referenced"
23330 " from DIE at 0x%x [in module %s]"),
23331 hex_string (signature), to_underlying (src_die->sect_off),
23332 objfile_name ((*ref_cu)->per_cu->dwarf2_per_objfile->objfile));
23335 die = follow_die_sig_1 (src_die, sig_type, ref_cu);
23338 dump_die_for_error (src_die);
23339 error (_("Dwarf Error: Problem reading signatured DIE %s referenced"
23340 " from DIE at 0x%x [in module %s]"),
23341 hex_string (signature), to_underlying (src_die->sect_off),
23342 objfile_name ((*ref_cu)->per_cu->dwarf2_per_objfile->objfile));
23348 /* Get the type specified by SIGNATURE referenced in DIE/CU,
23349 reading in and processing the type unit if necessary. */
23351 static struct type *
23352 get_signatured_type (struct die_info *die, ULONGEST signature,
23353 struct dwarf2_cu *cu)
23355 struct dwarf2_per_objfile *dwarf2_per_objfile
23356 = cu->per_cu->dwarf2_per_objfile;
23357 struct signatured_type *sig_type;
23358 struct dwarf2_cu *type_cu;
23359 struct die_info *type_die;
23362 sig_type = lookup_signatured_type (cu, signature);
23363 /* sig_type will be NULL if the signatured type is missing from
23365 if (sig_type == NULL)
23367 complaint (&symfile_complaints,
23368 _("Dwarf Error: Cannot find signatured DIE %s referenced"
23369 " from DIE at 0x%x [in module %s]"),
23370 hex_string (signature), to_underlying (die->sect_off),
23371 objfile_name (dwarf2_per_objfile->objfile));
23372 return build_error_marker_type (cu, die);
23375 /* If we already know the type we're done. */
23376 if (sig_type->type != NULL)
23377 return sig_type->type;
23380 type_die = follow_die_sig_1 (die, sig_type, &type_cu);
23381 if (type_die != NULL)
23383 /* N.B. We need to call get_die_type to ensure only one type for this DIE
23384 is created. This is important, for example, because for c++ classes
23385 we need TYPE_NAME set which is only done by new_symbol. Blech. */
23386 type = read_type_die (type_die, type_cu);
23389 complaint (&symfile_complaints,
23390 _("Dwarf Error: Cannot build signatured type %s"
23391 " referenced from DIE at 0x%x [in module %s]"),
23392 hex_string (signature), to_underlying (die->sect_off),
23393 objfile_name (dwarf2_per_objfile->objfile));
23394 type = build_error_marker_type (cu, die);
23399 complaint (&symfile_complaints,
23400 _("Dwarf Error: Problem reading signatured DIE %s referenced"
23401 " from DIE at 0x%x [in module %s]"),
23402 hex_string (signature), to_underlying (die->sect_off),
23403 objfile_name (dwarf2_per_objfile->objfile));
23404 type = build_error_marker_type (cu, die);
23406 sig_type->type = type;
23411 /* Get the type specified by the DW_AT_signature ATTR in DIE/CU,
23412 reading in and processing the type unit if necessary. */
23414 static struct type *
23415 get_DW_AT_signature_type (struct die_info *die, const struct attribute *attr,
23416 struct dwarf2_cu *cu) /* ARI: editCase function */
23418 /* Yes, DW_AT_signature can use a non-ref_sig8 reference. */
23419 if (attr_form_is_ref (attr))
23421 struct dwarf2_cu *type_cu = cu;
23422 struct die_info *type_die = follow_die_ref (die, attr, &type_cu);
23424 return read_type_die (type_die, type_cu);
23426 else if (attr->form == DW_FORM_ref_sig8)
23428 return get_signatured_type (die, DW_SIGNATURE (attr), cu);
23432 struct dwarf2_per_objfile *dwarf2_per_objfile
23433 = cu->per_cu->dwarf2_per_objfile;
23435 complaint (&symfile_complaints,
23436 _("Dwarf Error: DW_AT_signature has bad form %s in DIE"
23437 " at 0x%x [in module %s]"),
23438 dwarf_form_name (attr->form), to_underlying (die->sect_off),
23439 objfile_name (dwarf2_per_objfile->objfile));
23440 return build_error_marker_type (cu, die);
23444 /* Load the DIEs associated with type unit PER_CU into memory. */
23447 load_full_type_unit (struct dwarf2_per_cu_data *per_cu)
23449 struct signatured_type *sig_type;
23451 /* Caller is responsible for ensuring type_unit_groups don't get here. */
23452 gdb_assert (! IS_TYPE_UNIT_GROUP (per_cu));
23454 /* We have the per_cu, but we need the signatured_type.
23455 Fortunately this is an easy translation. */
23456 gdb_assert (per_cu->is_debug_types);
23457 sig_type = (struct signatured_type *) per_cu;
23459 gdb_assert (per_cu->cu == NULL);
23461 read_signatured_type (sig_type);
23463 gdb_assert (per_cu->cu != NULL);
23466 /* die_reader_func for read_signatured_type.
23467 This is identical to load_full_comp_unit_reader,
23468 but is kept separate for now. */
23471 read_signatured_type_reader (const struct die_reader_specs *reader,
23472 const gdb_byte *info_ptr,
23473 struct die_info *comp_unit_die,
23477 struct dwarf2_cu *cu = reader->cu;
23479 gdb_assert (cu->die_hash == NULL);
23481 htab_create_alloc_ex (cu->header.length / 12,
23485 &cu->comp_unit_obstack,
23486 hashtab_obstack_allocate,
23487 dummy_obstack_deallocate);
23490 comp_unit_die->child = read_die_and_siblings (reader, info_ptr,
23491 &info_ptr, comp_unit_die);
23492 cu->dies = comp_unit_die;
23493 /* comp_unit_die is not stored in die_hash, no need. */
23495 /* We try not to read any attributes in this function, because not
23496 all CUs needed for references have been loaded yet, and symbol
23497 table processing isn't initialized. But we have to set the CU language,
23498 or we won't be able to build types correctly.
23499 Similarly, if we do not read the producer, we can not apply
23500 producer-specific interpretation. */
23501 prepare_one_comp_unit (cu, cu->dies, language_minimal);
23504 /* Read in a signatured type and build its CU and DIEs.
23505 If the type is a stub for the real type in a DWO file,
23506 read in the real type from the DWO file as well. */
23509 read_signatured_type (struct signatured_type *sig_type)
23511 struct dwarf2_per_cu_data *per_cu = &sig_type->per_cu;
23513 gdb_assert (per_cu->is_debug_types);
23514 gdb_assert (per_cu->cu == NULL);
23516 init_cutu_and_read_dies (per_cu, NULL, 0, 1,
23517 read_signatured_type_reader, NULL);
23518 sig_type->per_cu.tu_read = 1;
23521 /* Decode simple location descriptions.
23522 Given a pointer to a dwarf block that defines a location, compute
23523 the location and return the value.
23525 NOTE drow/2003-11-18: This function is called in two situations
23526 now: for the address of static or global variables (partial symbols
23527 only) and for offsets into structures which are expected to be
23528 (more or less) constant. The partial symbol case should go away,
23529 and only the constant case should remain. That will let this
23530 function complain more accurately. A few special modes are allowed
23531 without complaint for global variables (for instance, global
23532 register values and thread-local values).
23534 A location description containing no operations indicates that the
23535 object is optimized out. The return value is 0 for that case.
23536 FIXME drow/2003-11-16: No callers check for this case any more; soon all
23537 callers will only want a very basic result and this can become a
23540 Note that stack[0] is unused except as a default error return. */
23543 decode_locdesc (struct dwarf_block *blk, struct dwarf2_cu *cu)
23545 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
23547 size_t size = blk->size;
23548 const gdb_byte *data = blk->data;
23549 CORE_ADDR stack[64];
23551 unsigned int bytes_read, unsnd;
23557 stack[++stacki] = 0;
23596 stack[++stacki] = op - DW_OP_lit0;
23631 stack[++stacki] = op - DW_OP_reg0;
23633 dwarf2_complex_location_expr_complaint ();
23637 unsnd = read_unsigned_leb128 (NULL, (data + i), &bytes_read);
23639 stack[++stacki] = unsnd;
23641 dwarf2_complex_location_expr_complaint ();
23645 stack[++stacki] = read_address (objfile->obfd, &data[i],
23650 case DW_OP_const1u:
23651 stack[++stacki] = read_1_byte (objfile->obfd, &data[i]);
23655 case DW_OP_const1s:
23656 stack[++stacki] = read_1_signed_byte (objfile->obfd, &data[i]);
23660 case DW_OP_const2u:
23661 stack[++stacki] = read_2_bytes (objfile->obfd, &data[i]);
23665 case DW_OP_const2s:
23666 stack[++stacki] = read_2_signed_bytes (objfile->obfd, &data[i]);
23670 case DW_OP_const4u:
23671 stack[++stacki] = read_4_bytes (objfile->obfd, &data[i]);
23675 case DW_OP_const4s:
23676 stack[++stacki] = read_4_signed_bytes (objfile->obfd, &data[i]);
23680 case DW_OP_const8u:
23681 stack[++stacki] = read_8_bytes (objfile->obfd, &data[i]);
23686 stack[++stacki] = read_unsigned_leb128 (NULL, (data + i),
23692 stack[++stacki] = read_signed_leb128 (NULL, (data + i), &bytes_read);
23697 stack[stacki + 1] = stack[stacki];
23702 stack[stacki - 1] += stack[stacki];
23706 case DW_OP_plus_uconst:
23707 stack[stacki] += read_unsigned_leb128 (NULL, (data + i),
23713 stack[stacki - 1] -= stack[stacki];
23718 /* If we're not the last op, then we definitely can't encode
23719 this using GDB's address_class enum. This is valid for partial
23720 global symbols, although the variable's address will be bogus
23723 dwarf2_complex_location_expr_complaint ();
23726 case DW_OP_GNU_push_tls_address:
23727 case DW_OP_form_tls_address:
23728 /* The top of the stack has the offset from the beginning
23729 of the thread control block at which the variable is located. */
23730 /* Nothing should follow this operator, so the top of stack would
23732 /* This is valid for partial global symbols, but the variable's
23733 address will be bogus in the psymtab. Make it always at least
23734 non-zero to not look as a variable garbage collected by linker
23735 which have DW_OP_addr 0. */
23737 dwarf2_complex_location_expr_complaint ();
23741 case DW_OP_GNU_uninit:
23744 case DW_OP_GNU_addr_index:
23745 case DW_OP_GNU_const_index:
23746 stack[++stacki] = read_addr_index_from_leb128 (cu, &data[i],
23753 const char *name = get_DW_OP_name (op);
23756 complaint (&symfile_complaints, _("unsupported stack op: '%s'"),
23759 complaint (&symfile_complaints, _("unsupported stack op: '%02x'"),
23763 return (stack[stacki]);
23766 /* Enforce maximum stack depth of SIZE-1 to avoid writing
23767 outside of the allocated space. Also enforce minimum>0. */
23768 if (stacki >= ARRAY_SIZE (stack) - 1)
23770 complaint (&symfile_complaints,
23771 _("location description stack overflow"));
23777 complaint (&symfile_complaints,
23778 _("location description stack underflow"));
23782 return (stack[stacki]);
23785 /* memory allocation interface */
23787 static struct dwarf_block *
23788 dwarf_alloc_block (struct dwarf2_cu *cu)
23790 return XOBNEW (&cu->comp_unit_obstack, struct dwarf_block);
23793 static struct die_info *
23794 dwarf_alloc_die (struct dwarf2_cu *cu, int num_attrs)
23796 struct die_info *die;
23797 size_t size = sizeof (struct die_info);
23800 size += (num_attrs - 1) * sizeof (struct attribute);
23802 die = (struct die_info *) obstack_alloc (&cu->comp_unit_obstack, size);
23803 memset (die, 0, sizeof (struct die_info));
23808 /* Macro support. */
23810 /* Return file name relative to the compilation directory of file number I in
23811 *LH's file name table. The result is allocated using xmalloc; the caller is
23812 responsible for freeing it. */
23815 file_file_name (int file, struct line_header *lh)
23817 /* Is the file number a valid index into the line header's file name
23818 table? Remember that file numbers start with one, not zero. */
23819 if (1 <= file && file <= lh->file_names.size ())
23821 const file_entry &fe = lh->file_names[file - 1];
23823 if (!IS_ABSOLUTE_PATH (fe.name))
23825 const char *dir = fe.include_dir (lh);
23827 return concat (dir, SLASH_STRING, fe.name, (char *) NULL);
23829 return xstrdup (fe.name);
23833 /* The compiler produced a bogus file number. We can at least
23834 record the macro definitions made in the file, even if we
23835 won't be able to find the file by name. */
23836 char fake_name[80];
23838 xsnprintf (fake_name, sizeof (fake_name),
23839 "<bad macro file number %d>", file);
23841 complaint (&symfile_complaints,
23842 _("bad file number in macro information (%d)"),
23845 return xstrdup (fake_name);
23849 /* Return the full name of file number I in *LH's file name table.
23850 Use COMP_DIR as the name of the current directory of the
23851 compilation. The result is allocated using xmalloc; the caller is
23852 responsible for freeing it. */
23854 file_full_name (int file, struct line_header *lh, const char *comp_dir)
23856 /* Is the file number a valid index into the line header's file name
23857 table? Remember that file numbers start with one, not zero. */
23858 if (1 <= file && file <= lh->file_names.size ())
23860 char *relative = file_file_name (file, lh);
23862 if (IS_ABSOLUTE_PATH (relative) || comp_dir == NULL)
23864 return reconcat (relative, comp_dir, SLASH_STRING,
23865 relative, (char *) NULL);
23868 return file_file_name (file, lh);
23872 static struct macro_source_file *
23873 macro_start_file (int file, int line,
23874 struct macro_source_file *current_file,
23875 struct line_header *lh)
23877 /* File name relative to the compilation directory of this source file. */
23878 char *file_name = file_file_name (file, lh);
23880 if (! current_file)
23882 /* Note: We don't create a macro table for this compilation unit
23883 at all until we actually get a filename. */
23884 struct macro_table *macro_table = get_macro_table ();
23886 /* If we have no current file, then this must be the start_file
23887 directive for the compilation unit's main source file. */
23888 current_file = macro_set_main (macro_table, file_name);
23889 macro_define_special (macro_table);
23892 current_file = macro_include (current_file, line, file_name);
23896 return current_file;
23899 static const char *
23900 consume_improper_spaces (const char *p, const char *body)
23904 complaint (&symfile_complaints,
23905 _("macro definition contains spaces "
23906 "in formal argument list:\n`%s'"),
23918 parse_macro_definition (struct macro_source_file *file, int line,
23923 /* The body string takes one of two forms. For object-like macro
23924 definitions, it should be:
23926 <macro name> " " <definition>
23928 For function-like macro definitions, it should be:
23930 <macro name> "() " <definition>
23932 <macro name> "(" <arg name> ( "," <arg name> ) * ") " <definition>
23934 Spaces may appear only where explicitly indicated, and in the
23937 The Dwarf 2 spec says that an object-like macro's name is always
23938 followed by a space, but versions of GCC around March 2002 omit
23939 the space when the macro's definition is the empty string.
23941 The Dwarf 2 spec says that there should be no spaces between the
23942 formal arguments in a function-like macro's formal argument list,
23943 but versions of GCC around March 2002 include spaces after the
23947 /* Find the extent of the macro name. The macro name is terminated
23948 by either a space or null character (for an object-like macro) or
23949 an opening paren (for a function-like macro). */
23950 for (p = body; *p; p++)
23951 if (*p == ' ' || *p == '(')
23954 if (*p == ' ' || *p == '\0')
23956 /* It's an object-like macro. */
23957 int name_len = p - body;
23958 char *name = savestring (body, name_len);
23959 const char *replacement;
23962 replacement = body + name_len + 1;
23965 dwarf2_macro_malformed_definition_complaint (body);
23966 replacement = body + name_len;
23969 macro_define_object (file, line, name, replacement);
23973 else if (*p == '(')
23975 /* It's a function-like macro. */
23976 char *name = savestring (body, p - body);
23979 char **argv = XNEWVEC (char *, argv_size);
23983 p = consume_improper_spaces (p, body);
23985 /* Parse the formal argument list. */
23986 while (*p && *p != ')')
23988 /* Find the extent of the current argument name. */
23989 const char *arg_start = p;
23991 while (*p && *p != ',' && *p != ')' && *p != ' ')
23994 if (! *p || p == arg_start)
23995 dwarf2_macro_malformed_definition_complaint (body);
23998 /* Make sure argv has room for the new argument. */
23999 if (argc >= argv_size)
24002 argv = XRESIZEVEC (char *, argv, argv_size);
24005 argv[argc++] = savestring (arg_start, p - arg_start);
24008 p = consume_improper_spaces (p, body);
24010 /* Consume the comma, if present. */
24015 p = consume_improper_spaces (p, body);
24024 /* Perfectly formed definition, no complaints. */
24025 macro_define_function (file, line, name,
24026 argc, (const char **) argv,
24028 else if (*p == '\0')
24030 /* Complain, but do define it. */
24031 dwarf2_macro_malformed_definition_complaint (body);
24032 macro_define_function (file, line, name,
24033 argc, (const char **) argv,
24037 /* Just complain. */
24038 dwarf2_macro_malformed_definition_complaint (body);
24041 /* Just complain. */
24042 dwarf2_macro_malformed_definition_complaint (body);
24048 for (i = 0; i < argc; i++)
24054 dwarf2_macro_malformed_definition_complaint (body);
24057 /* Skip some bytes from BYTES according to the form given in FORM.
24058 Returns the new pointer. */
24060 static const gdb_byte *
24061 skip_form_bytes (bfd *abfd, const gdb_byte *bytes, const gdb_byte *buffer_end,
24062 enum dwarf_form form,
24063 unsigned int offset_size,
24064 struct dwarf2_section_info *section)
24066 unsigned int bytes_read;
24070 case DW_FORM_data1:
24075 case DW_FORM_data2:
24079 case DW_FORM_data4:
24083 case DW_FORM_data8:
24087 case DW_FORM_data16:
24091 case DW_FORM_string:
24092 read_direct_string (abfd, bytes, &bytes_read);
24093 bytes += bytes_read;
24096 case DW_FORM_sec_offset:
24098 case DW_FORM_GNU_strp_alt:
24099 bytes += offset_size;
24102 case DW_FORM_block:
24103 bytes += read_unsigned_leb128 (abfd, bytes, &bytes_read);
24104 bytes += bytes_read;
24107 case DW_FORM_block1:
24108 bytes += 1 + read_1_byte (abfd, bytes);
24110 case DW_FORM_block2:
24111 bytes += 2 + read_2_bytes (abfd, bytes);
24113 case DW_FORM_block4:
24114 bytes += 4 + read_4_bytes (abfd, bytes);
24117 case DW_FORM_sdata:
24118 case DW_FORM_udata:
24119 case DW_FORM_GNU_addr_index:
24120 case DW_FORM_GNU_str_index:
24121 bytes = gdb_skip_leb128 (bytes, buffer_end);
24124 dwarf2_section_buffer_overflow_complaint (section);
24129 case DW_FORM_implicit_const:
24134 complaint (&symfile_complaints,
24135 _("invalid form 0x%x in `%s'"),
24136 form, get_section_name (section));
24144 /* A helper for dwarf_decode_macros that handles skipping an unknown
24145 opcode. Returns an updated pointer to the macro data buffer; or,
24146 on error, issues a complaint and returns NULL. */
24148 static const gdb_byte *
24149 skip_unknown_opcode (unsigned int opcode,
24150 const gdb_byte **opcode_definitions,
24151 const gdb_byte *mac_ptr, const gdb_byte *mac_end,
24153 unsigned int offset_size,
24154 struct dwarf2_section_info *section)
24156 unsigned int bytes_read, i;
24158 const gdb_byte *defn;
24160 if (opcode_definitions[opcode] == NULL)
24162 complaint (&symfile_complaints,
24163 _("unrecognized DW_MACFINO opcode 0x%x"),
24168 defn = opcode_definitions[opcode];
24169 arg = read_unsigned_leb128 (abfd, defn, &bytes_read);
24170 defn += bytes_read;
24172 for (i = 0; i < arg; ++i)
24174 mac_ptr = skip_form_bytes (abfd, mac_ptr, mac_end,
24175 (enum dwarf_form) defn[i], offset_size,
24177 if (mac_ptr == NULL)
24179 /* skip_form_bytes already issued the complaint. */
24187 /* A helper function which parses the header of a macro section.
24188 If the macro section is the extended (for now called "GNU") type,
24189 then this updates *OFFSET_SIZE. Returns a pointer to just after
24190 the header, or issues a complaint and returns NULL on error. */
24192 static const gdb_byte *
24193 dwarf_parse_macro_header (const gdb_byte **opcode_definitions,
24195 const gdb_byte *mac_ptr,
24196 unsigned int *offset_size,
24197 int section_is_gnu)
24199 memset (opcode_definitions, 0, 256 * sizeof (gdb_byte *));
24201 if (section_is_gnu)
24203 unsigned int version, flags;
24205 version = read_2_bytes (abfd, mac_ptr);
24206 if (version != 4 && version != 5)
24208 complaint (&symfile_complaints,
24209 _("unrecognized version `%d' in .debug_macro section"),
24215 flags = read_1_byte (abfd, mac_ptr);
24217 *offset_size = (flags & 1) ? 8 : 4;
24219 if ((flags & 2) != 0)
24220 /* We don't need the line table offset. */
24221 mac_ptr += *offset_size;
24223 /* Vendor opcode descriptions. */
24224 if ((flags & 4) != 0)
24226 unsigned int i, count;
24228 count = read_1_byte (abfd, mac_ptr);
24230 for (i = 0; i < count; ++i)
24232 unsigned int opcode, bytes_read;
24235 opcode = read_1_byte (abfd, mac_ptr);
24237 opcode_definitions[opcode] = mac_ptr;
24238 arg = read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
24239 mac_ptr += bytes_read;
24248 /* A helper for dwarf_decode_macros that handles the GNU extensions,
24249 including DW_MACRO_import. */
24252 dwarf_decode_macro_bytes (struct dwarf2_per_objfile *dwarf2_per_objfile,
24254 const gdb_byte *mac_ptr, const gdb_byte *mac_end,
24255 struct macro_source_file *current_file,
24256 struct line_header *lh,
24257 struct dwarf2_section_info *section,
24258 int section_is_gnu, int section_is_dwz,
24259 unsigned int offset_size,
24260 htab_t include_hash)
24262 struct objfile *objfile = dwarf2_per_objfile->objfile;
24263 enum dwarf_macro_record_type macinfo_type;
24264 int at_commandline;
24265 const gdb_byte *opcode_definitions[256];
24267 mac_ptr = dwarf_parse_macro_header (opcode_definitions, abfd, mac_ptr,
24268 &offset_size, section_is_gnu);
24269 if (mac_ptr == NULL)
24271 /* We already issued a complaint. */
24275 /* Determines if GDB is still before first DW_MACINFO_start_file. If true
24276 GDB is still reading the definitions from command line. First
24277 DW_MACINFO_start_file will need to be ignored as it was already executed
24278 to create CURRENT_FILE for the main source holding also the command line
24279 definitions. On first met DW_MACINFO_start_file this flag is reset to
24280 normally execute all the remaining DW_MACINFO_start_file macinfos. */
24282 at_commandline = 1;
24286 /* Do we at least have room for a macinfo type byte? */
24287 if (mac_ptr >= mac_end)
24289 dwarf2_section_buffer_overflow_complaint (section);
24293 macinfo_type = (enum dwarf_macro_record_type) read_1_byte (abfd, mac_ptr);
24296 /* Note that we rely on the fact that the corresponding GNU and
24297 DWARF constants are the same. */
24299 DIAGNOSTIC_IGNORE_SWITCH_DIFFERENT_ENUM_TYPES
24300 switch (macinfo_type)
24302 /* A zero macinfo type indicates the end of the macro
24307 case DW_MACRO_define:
24308 case DW_MACRO_undef:
24309 case DW_MACRO_define_strp:
24310 case DW_MACRO_undef_strp:
24311 case DW_MACRO_define_sup:
24312 case DW_MACRO_undef_sup:
24314 unsigned int bytes_read;
24319 line = read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
24320 mac_ptr += bytes_read;
24322 if (macinfo_type == DW_MACRO_define
24323 || macinfo_type == DW_MACRO_undef)
24325 body = read_direct_string (abfd, mac_ptr, &bytes_read);
24326 mac_ptr += bytes_read;
24330 LONGEST str_offset;
24332 str_offset = read_offset_1 (abfd, mac_ptr, offset_size);
24333 mac_ptr += offset_size;
24335 if (macinfo_type == DW_MACRO_define_sup
24336 || macinfo_type == DW_MACRO_undef_sup
24339 struct dwz_file *dwz
24340 = dwarf2_get_dwz_file (dwarf2_per_objfile);
24342 body = read_indirect_string_from_dwz (objfile,
24346 body = read_indirect_string_at_offset (dwarf2_per_objfile,
24350 is_define = (macinfo_type == DW_MACRO_define
24351 || macinfo_type == DW_MACRO_define_strp
24352 || macinfo_type == DW_MACRO_define_sup);
24353 if (! current_file)
24355 /* DWARF violation as no main source is present. */
24356 complaint (&symfile_complaints,
24357 _("debug info with no main source gives macro %s "
24359 is_define ? _("definition") : _("undefinition"),
24363 if ((line == 0 && !at_commandline)
24364 || (line != 0 && at_commandline))
24365 complaint (&symfile_complaints,
24366 _("debug info gives %s macro %s with %s line %d: %s"),
24367 at_commandline ? _("command-line") : _("in-file"),
24368 is_define ? _("definition") : _("undefinition"),
24369 line == 0 ? _("zero") : _("non-zero"), line, body);
24372 parse_macro_definition (current_file, line, body);
24375 gdb_assert (macinfo_type == DW_MACRO_undef
24376 || macinfo_type == DW_MACRO_undef_strp
24377 || macinfo_type == DW_MACRO_undef_sup);
24378 macro_undef (current_file, line, body);
24383 case DW_MACRO_start_file:
24385 unsigned int bytes_read;
24388 line = read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
24389 mac_ptr += bytes_read;
24390 file = read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
24391 mac_ptr += bytes_read;
24393 if ((line == 0 && !at_commandline)
24394 || (line != 0 && at_commandline))
24395 complaint (&symfile_complaints,
24396 _("debug info gives source %d included "
24397 "from %s at %s line %d"),
24398 file, at_commandline ? _("command-line") : _("file"),
24399 line == 0 ? _("zero") : _("non-zero"), line);
24401 if (at_commandline)
24403 /* This DW_MACRO_start_file was executed in the
24405 at_commandline = 0;
24408 current_file = macro_start_file (file, line, current_file, lh);
24412 case DW_MACRO_end_file:
24413 if (! current_file)
24414 complaint (&symfile_complaints,
24415 _("macro debug info has an unmatched "
24416 "`close_file' directive"));
24419 current_file = current_file->included_by;
24420 if (! current_file)
24422 enum dwarf_macro_record_type next_type;
24424 /* GCC circa March 2002 doesn't produce the zero
24425 type byte marking the end of the compilation
24426 unit. Complain if it's not there, but exit no
24429 /* Do we at least have room for a macinfo type byte? */
24430 if (mac_ptr >= mac_end)
24432 dwarf2_section_buffer_overflow_complaint (section);
24436 /* We don't increment mac_ptr here, so this is just
24439 = (enum dwarf_macro_record_type) read_1_byte (abfd,
24441 if (next_type != 0)
24442 complaint (&symfile_complaints,
24443 _("no terminating 0-type entry for "
24444 "macros in `.debug_macinfo' section"));
24451 case DW_MACRO_import:
24452 case DW_MACRO_import_sup:
24456 bfd *include_bfd = abfd;
24457 struct dwarf2_section_info *include_section = section;
24458 const gdb_byte *include_mac_end = mac_end;
24459 int is_dwz = section_is_dwz;
24460 const gdb_byte *new_mac_ptr;
24462 offset = read_offset_1 (abfd, mac_ptr, offset_size);
24463 mac_ptr += offset_size;
24465 if (macinfo_type == DW_MACRO_import_sup)
24467 struct dwz_file *dwz = dwarf2_get_dwz_file (dwarf2_per_objfile);
24469 dwarf2_read_section (objfile, &dwz->macro);
24471 include_section = &dwz->macro;
24472 include_bfd = get_section_bfd_owner (include_section);
24473 include_mac_end = dwz->macro.buffer + dwz->macro.size;
24477 new_mac_ptr = include_section->buffer + offset;
24478 slot = htab_find_slot (include_hash, new_mac_ptr, INSERT);
24482 /* This has actually happened; see
24483 http://sourceware.org/bugzilla/show_bug.cgi?id=13568. */
24484 complaint (&symfile_complaints,
24485 _("recursive DW_MACRO_import in "
24486 ".debug_macro section"));
24490 *slot = (void *) new_mac_ptr;
24492 dwarf_decode_macro_bytes (dwarf2_per_objfile,
24493 include_bfd, new_mac_ptr,
24494 include_mac_end, current_file, lh,
24495 section, section_is_gnu, is_dwz,
24496 offset_size, include_hash);
24498 htab_remove_elt (include_hash, (void *) new_mac_ptr);
24503 case DW_MACINFO_vendor_ext:
24504 if (!section_is_gnu)
24506 unsigned int bytes_read;
24508 /* This reads the constant, but since we don't recognize
24509 any vendor extensions, we ignore it. */
24510 read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
24511 mac_ptr += bytes_read;
24512 read_direct_string (abfd, mac_ptr, &bytes_read);
24513 mac_ptr += bytes_read;
24515 /* We don't recognize any vendor extensions. */
24521 mac_ptr = skip_unknown_opcode (macinfo_type, opcode_definitions,
24522 mac_ptr, mac_end, abfd, offset_size,
24524 if (mac_ptr == NULL)
24529 } while (macinfo_type != 0);
24533 dwarf_decode_macros (struct dwarf2_cu *cu, unsigned int offset,
24534 int section_is_gnu)
24536 struct dwarf2_per_objfile *dwarf2_per_objfile
24537 = cu->per_cu->dwarf2_per_objfile;
24538 struct objfile *objfile = dwarf2_per_objfile->objfile;
24539 struct line_header *lh = cu->line_header;
24541 const gdb_byte *mac_ptr, *mac_end;
24542 struct macro_source_file *current_file = 0;
24543 enum dwarf_macro_record_type macinfo_type;
24544 unsigned int offset_size = cu->header.offset_size;
24545 const gdb_byte *opcode_definitions[256];
24547 struct dwarf2_section_info *section;
24548 const char *section_name;
24550 if (cu->dwo_unit != NULL)
24552 if (section_is_gnu)
24554 section = &cu->dwo_unit->dwo_file->sections.macro;
24555 section_name = ".debug_macro.dwo";
24559 section = &cu->dwo_unit->dwo_file->sections.macinfo;
24560 section_name = ".debug_macinfo.dwo";
24565 if (section_is_gnu)
24567 section = &dwarf2_per_objfile->macro;
24568 section_name = ".debug_macro";
24572 section = &dwarf2_per_objfile->macinfo;
24573 section_name = ".debug_macinfo";
24577 dwarf2_read_section (objfile, section);
24578 if (section->buffer == NULL)
24580 complaint (&symfile_complaints, _("missing %s section"), section_name);
24583 abfd = get_section_bfd_owner (section);
24585 /* First pass: Find the name of the base filename.
24586 This filename is needed in order to process all macros whose definition
24587 (or undefinition) comes from the command line. These macros are defined
24588 before the first DW_MACINFO_start_file entry, and yet still need to be
24589 associated to the base file.
24591 To determine the base file name, we scan the macro definitions until we
24592 reach the first DW_MACINFO_start_file entry. We then initialize
24593 CURRENT_FILE accordingly so that any macro definition found before the
24594 first DW_MACINFO_start_file can still be associated to the base file. */
24596 mac_ptr = section->buffer + offset;
24597 mac_end = section->buffer + section->size;
24599 mac_ptr = dwarf_parse_macro_header (opcode_definitions, abfd, mac_ptr,
24600 &offset_size, section_is_gnu);
24601 if (mac_ptr == NULL)
24603 /* We already issued a complaint. */
24609 /* Do we at least have room for a macinfo type byte? */
24610 if (mac_ptr >= mac_end)
24612 /* Complaint is printed during the second pass as GDB will probably
24613 stop the first pass earlier upon finding
24614 DW_MACINFO_start_file. */
24618 macinfo_type = (enum dwarf_macro_record_type) read_1_byte (abfd, mac_ptr);
24621 /* Note that we rely on the fact that the corresponding GNU and
24622 DWARF constants are the same. */
24624 DIAGNOSTIC_IGNORE_SWITCH_DIFFERENT_ENUM_TYPES
24625 switch (macinfo_type)
24627 /* A zero macinfo type indicates the end of the macro
24632 case DW_MACRO_define:
24633 case DW_MACRO_undef:
24634 /* Only skip the data by MAC_PTR. */
24636 unsigned int bytes_read;
24638 read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
24639 mac_ptr += bytes_read;
24640 read_direct_string (abfd, mac_ptr, &bytes_read);
24641 mac_ptr += bytes_read;
24645 case DW_MACRO_start_file:
24647 unsigned int bytes_read;
24650 line = read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
24651 mac_ptr += bytes_read;
24652 file = read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
24653 mac_ptr += bytes_read;
24655 current_file = macro_start_file (file, line, current_file, lh);
24659 case DW_MACRO_end_file:
24660 /* No data to skip by MAC_PTR. */
24663 case DW_MACRO_define_strp:
24664 case DW_MACRO_undef_strp:
24665 case DW_MACRO_define_sup:
24666 case DW_MACRO_undef_sup:
24668 unsigned int bytes_read;
24670 read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
24671 mac_ptr += bytes_read;
24672 mac_ptr += offset_size;
24676 case DW_MACRO_import:
24677 case DW_MACRO_import_sup:
24678 /* Note that, according to the spec, a transparent include
24679 chain cannot call DW_MACRO_start_file. So, we can just
24680 skip this opcode. */
24681 mac_ptr += offset_size;
24684 case DW_MACINFO_vendor_ext:
24685 /* Only skip the data by MAC_PTR. */
24686 if (!section_is_gnu)
24688 unsigned int bytes_read;
24690 read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
24691 mac_ptr += bytes_read;
24692 read_direct_string (abfd, mac_ptr, &bytes_read);
24693 mac_ptr += bytes_read;
24698 mac_ptr = skip_unknown_opcode (macinfo_type, opcode_definitions,
24699 mac_ptr, mac_end, abfd, offset_size,
24701 if (mac_ptr == NULL)
24706 } while (macinfo_type != 0 && current_file == NULL);
24708 /* Second pass: Process all entries.
24710 Use the AT_COMMAND_LINE flag to determine whether we are still processing
24711 command-line macro definitions/undefinitions. This flag is unset when we
24712 reach the first DW_MACINFO_start_file entry. */
24714 htab_up include_hash (htab_create_alloc (1, htab_hash_pointer,
24716 NULL, xcalloc, xfree));
24717 mac_ptr = section->buffer + offset;
24718 slot = htab_find_slot (include_hash.get (), mac_ptr, INSERT);
24719 *slot = (void *) mac_ptr;
24720 dwarf_decode_macro_bytes (dwarf2_per_objfile,
24721 abfd, mac_ptr, mac_end,
24722 current_file, lh, section,
24723 section_is_gnu, 0, offset_size,
24724 include_hash.get ());
24727 /* Check if the attribute's form is a DW_FORM_block*
24728 if so return true else false. */
24731 attr_form_is_block (const struct attribute *attr)
24733 return (attr == NULL ? 0 :
24734 attr->form == DW_FORM_block1
24735 || attr->form == DW_FORM_block2
24736 || attr->form == DW_FORM_block4
24737 || attr->form == DW_FORM_block
24738 || attr->form == DW_FORM_exprloc);
24741 /* Return non-zero if ATTR's value is a section offset --- classes
24742 lineptr, loclistptr, macptr or rangelistptr --- or zero, otherwise.
24743 You may use DW_UNSND (attr) to retrieve such offsets.
24745 Section 7.5.4, "Attribute Encodings", explains that no attribute
24746 may have a value that belongs to more than one of these classes; it
24747 would be ambiguous if we did, because we use the same forms for all
24751 attr_form_is_section_offset (const struct attribute *attr)
24753 return (attr->form == DW_FORM_data4
24754 || attr->form == DW_FORM_data8
24755 || attr->form == DW_FORM_sec_offset);
24758 /* Return non-zero if ATTR's value falls in the 'constant' class, or
24759 zero otherwise. When this function returns true, you can apply
24760 dwarf2_get_attr_constant_value to it.
24762 However, note that for some attributes you must check
24763 attr_form_is_section_offset before using this test. DW_FORM_data4
24764 and DW_FORM_data8 are members of both the constant class, and of
24765 the classes that contain offsets into other debug sections
24766 (lineptr, loclistptr, macptr or rangelistptr). The DWARF spec says
24767 that, if an attribute's can be either a constant or one of the
24768 section offset classes, DW_FORM_data4 and DW_FORM_data8 should be
24769 taken as section offsets, not constants.
24771 DW_FORM_data16 is not considered as dwarf2_get_attr_constant_value
24772 cannot handle that. */
24775 attr_form_is_constant (const struct attribute *attr)
24777 switch (attr->form)
24779 case DW_FORM_sdata:
24780 case DW_FORM_udata:
24781 case DW_FORM_data1:
24782 case DW_FORM_data2:
24783 case DW_FORM_data4:
24784 case DW_FORM_data8:
24785 case DW_FORM_implicit_const:
24793 /* DW_ADDR is always stored already as sect_offset; despite for the forms
24794 besides DW_FORM_ref_addr it is stored as cu_offset in the DWARF file. */
24797 attr_form_is_ref (const struct attribute *attr)
24799 switch (attr->form)
24801 case DW_FORM_ref_addr:
24806 case DW_FORM_ref_udata:
24807 case DW_FORM_GNU_ref_alt:
24814 /* Return the .debug_loc section to use for CU.
24815 For DWO files use .debug_loc.dwo. */
24817 static struct dwarf2_section_info *
24818 cu_debug_loc_section (struct dwarf2_cu *cu)
24820 struct dwarf2_per_objfile *dwarf2_per_objfile
24821 = cu->per_cu->dwarf2_per_objfile;
24825 struct dwo_sections *sections = &cu->dwo_unit->dwo_file->sections;
24827 return cu->header.version >= 5 ? §ions->loclists : §ions->loc;
24829 return (cu->header.version >= 5 ? &dwarf2_per_objfile->loclists
24830 : &dwarf2_per_objfile->loc);
24833 /* A helper function that fills in a dwarf2_loclist_baton. */
24836 fill_in_loclist_baton (struct dwarf2_cu *cu,
24837 struct dwarf2_loclist_baton *baton,
24838 const struct attribute *attr)
24840 struct dwarf2_per_objfile *dwarf2_per_objfile
24841 = cu->per_cu->dwarf2_per_objfile;
24842 struct dwarf2_section_info *section = cu_debug_loc_section (cu);
24844 dwarf2_read_section (dwarf2_per_objfile->objfile, section);
24846 baton->per_cu = cu->per_cu;
24847 gdb_assert (baton->per_cu);
24848 /* We don't know how long the location list is, but make sure we
24849 don't run off the edge of the section. */
24850 baton->size = section->size - DW_UNSND (attr);
24851 baton->data = section->buffer + DW_UNSND (attr);
24852 baton->base_address = cu->base_address;
24853 baton->from_dwo = cu->dwo_unit != NULL;
24857 dwarf2_symbol_mark_computed (const struct attribute *attr, struct symbol *sym,
24858 struct dwarf2_cu *cu, int is_block)
24860 struct dwarf2_per_objfile *dwarf2_per_objfile
24861 = cu->per_cu->dwarf2_per_objfile;
24862 struct objfile *objfile = dwarf2_per_objfile->objfile;
24863 struct dwarf2_section_info *section = cu_debug_loc_section (cu);
24865 if (attr_form_is_section_offset (attr)
24866 /* .debug_loc{,.dwo} may not exist at all, or the offset may be outside
24867 the section. If so, fall through to the complaint in the
24869 && DW_UNSND (attr) < dwarf2_section_size (objfile, section))
24871 struct dwarf2_loclist_baton *baton;
24873 baton = XOBNEW (&objfile->objfile_obstack, struct dwarf2_loclist_baton);
24875 fill_in_loclist_baton (cu, baton, attr);
24877 if (cu->base_known == 0)
24878 complaint (&symfile_complaints,
24879 _("Location list used without "
24880 "specifying the CU base address."));
24882 SYMBOL_ACLASS_INDEX (sym) = (is_block
24883 ? dwarf2_loclist_block_index
24884 : dwarf2_loclist_index);
24885 SYMBOL_LOCATION_BATON (sym) = baton;
24889 struct dwarf2_locexpr_baton *baton;
24891 baton = XOBNEW (&objfile->objfile_obstack, struct dwarf2_locexpr_baton);
24892 baton->per_cu = cu->per_cu;
24893 gdb_assert (baton->per_cu);
24895 if (attr_form_is_block (attr))
24897 /* Note that we're just copying the block's data pointer
24898 here, not the actual data. We're still pointing into the
24899 info_buffer for SYM's objfile; right now we never release
24900 that buffer, but when we do clean up properly this may
24902 baton->size = DW_BLOCK (attr)->size;
24903 baton->data = DW_BLOCK (attr)->data;
24907 dwarf2_invalid_attrib_class_complaint ("location description",
24908 SYMBOL_NATURAL_NAME (sym));
24912 SYMBOL_ACLASS_INDEX (sym) = (is_block
24913 ? dwarf2_locexpr_block_index
24914 : dwarf2_locexpr_index);
24915 SYMBOL_LOCATION_BATON (sym) = baton;
24919 /* Return the OBJFILE associated with the compilation unit CU. If CU
24920 came from a separate debuginfo file, then the master objfile is
24924 dwarf2_per_cu_objfile (struct dwarf2_per_cu_data *per_cu)
24926 struct objfile *objfile = per_cu->dwarf2_per_objfile->objfile;
24928 /* Return the master objfile, so that we can report and look up the
24929 correct file containing this variable. */
24930 if (objfile->separate_debug_objfile_backlink)
24931 objfile = objfile->separate_debug_objfile_backlink;
24936 /* Return comp_unit_head for PER_CU, either already available in PER_CU->CU
24937 (CU_HEADERP is unused in such case) or prepare a temporary copy at
24938 CU_HEADERP first. */
24940 static const struct comp_unit_head *
24941 per_cu_header_read_in (struct comp_unit_head *cu_headerp,
24942 struct dwarf2_per_cu_data *per_cu)
24944 const gdb_byte *info_ptr;
24947 return &per_cu->cu->header;
24949 info_ptr = per_cu->section->buffer + to_underlying (per_cu->sect_off);
24951 memset (cu_headerp, 0, sizeof (*cu_headerp));
24952 read_comp_unit_head (cu_headerp, info_ptr, per_cu->section,
24953 rcuh_kind::COMPILE);
24958 /* Return the address size given in the compilation unit header for CU. */
24961 dwarf2_per_cu_addr_size (struct dwarf2_per_cu_data *per_cu)
24963 struct comp_unit_head cu_header_local;
24964 const struct comp_unit_head *cu_headerp;
24966 cu_headerp = per_cu_header_read_in (&cu_header_local, per_cu);
24968 return cu_headerp->addr_size;
24971 /* Return the offset size given in the compilation unit header for CU. */
24974 dwarf2_per_cu_offset_size (struct dwarf2_per_cu_data *per_cu)
24976 struct comp_unit_head cu_header_local;
24977 const struct comp_unit_head *cu_headerp;
24979 cu_headerp = per_cu_header_read_in (&cu_header_local, per_cu);
24981 return cu_headerp->offset_size;
24984 /* See its dwarf2loc.h declaration. */
24987 dwarf2_per_cu_ref_addr_size (struct dwarf2_per_cu_data *per_cu)
24989 struct comp_unit_head cu_header_local;
24990 const struct comp_unit_head *cu_headerp;
24992 cu_headerp = per_cu_header_read_in (&cu_header_local, per_cu);
24994 if (cu_headerp->version == 2)
24995 return cu_headerp->addr_size;
24997 return cu_headerp->offset_size;
25000 /* Return the text offset of the CU. The returned offset comes from
25001 this CU's objfile. If this objfile came from a separate debuginfo
25002 file, then the offset may be different from the corresponding
25003 offset in the parent objfile. */
25006 dwarf2_per_cu_text_offset (struct dwarf2_per_cu_data *per_cu)
25008 struct objfile *objfile = per_cu->dwarf2_per_objfile->objfile;
25010 return ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
25013 /* Return DWARF version number of PER_CU. */
25016 dwarf2_version (struct dwarf2_per_cu_data *per_cu)
25018 return per_cu->dwarf_version;
25021 /* Locate the .debug_info compilation unit from CU's objfile which contains
25022 the DIE at OFFSET. Raises an error on failure. */
25024 static struct dwarf2_per_cu_data *
25025 dwarf2_find_containing_comp_unit (sect_offset sect_off,
25026 unsigned int offset_in_dwz,
25027 struct dwarf2_per_objfile *dwarf2_per_objfile)
25029 struct dwarf2_per_cu_data *this_cu;
25031 const sect_offset *cu_off;
25034 high = dwarf2_per_objfile->n_comp_units - 1;
25037 struct dwarf2_per_cu_data *mid_cu;
25038 int mid = low + (high - low) / 2;
25040 mid_cu = dwarf2_per_objfile->all_comp_units[mid];
25041 cu_off = &mid_cu->sect_off;
25042 if (mid_cu->is_dwz > offset_in_dwz
25043 || (mid_cu->is_dwz == offset_in_dwz && *cu_off >= sect_off))
25048 gdb_assert (low == high);
25049 this_cu = dwarf2_per_objfile->all_comp_units[low];
25050 cu_off = &this_cu->sect_off;
25051 if (this_cu->is_dwz != offset_in_dwz || *cu_off > sect_off)
25053 if (low == 0 || this_cu->is_dwz != offset_in_dwz)
25054 error (_("Dwarf Error: could not find partial DIE containing "
25055 "offset 0x%x [in module %s]"),
25056 to_underlying (sect_off),
25057 bfd_get_filename (dwarf2_per_objfile->objfile->obfd));
25059 gdb_assert (dwarf2_per_objfile->all_comp_units[low-1]->sect_off
25061 return dwarf2_per_objfile->all_comp_units[low-1];
25065 this_cu = dwarf2_per_objfile->all_comp_units[low];
25066 if (low == dwarf2_per_objfile->n_comp_units - 1
25067 && sect_off >= this_cu->sect_off + this_cu->length)
25068 error (_("invalid dwarf2 offset %u"), to_underlying (sect_off));
25069 gdb_assert (sect_off < this_cu->sect_off + this_cu->length);
25074 /* Initialize dwarf2_cu CU, owned by PER_CU. */
25076 dwarf2_cu::dwarf2_cu (struct dwarf2_per_cu_data *per_cu_)
25077 : per_cu (per_cu_),
25080 checked_producer (0),
25081 producer_is_gxx_lt_4_6 (0),
25082 producer_is_gcc_lt_4_3 (0),
25083 producer_is_icc_lt_14 (0),
25084 processing_has_namespace_info (0)
25089 /* Destroy a dwarf2_cu. */
25091 dwarf2_cu::~dwarf2_cu ()
25096 /* Initialize basic fields of dwarf_cu CU according to DIE COMP_UNIT_DIE. */
25099 prepare_one_comp_unit (struct dwarf2_cu *cu, struct die_info *comp_unit_die,
25100 enum language pretend_language)
25102 struct attribute *attr;
25104 /* Set the language we're debugging. */
25105 attr = dwarf2_attr (comp_unit_die, DW_AT_language, cu);
25107 set_cu_language (DW_UNSND (attr), cu);
25110 cu->language = pretend_language;
25111 cu->language_defn = language_def (cu->language);
25114 cu->producer = dwarf2_string_attr (comp_unit_die, DW_AT_producer, cu);
25117 /* Free all cached compilation units. */
25120 free_cached_comp_units (void *data)
25122 struct dwarf2_per_objfile *dwarf2_per_objfile
25123 = (struct dwarf2_per_objfile *) data;
25125 dwarf2_per_objfile->free_cached_comp_units ();
25128 /* Increase the age counter on each cached compilation unit, and free
25129 any that are too old. */
25132 age_cached_comp_units (struct dwarf2_per_objfile *dwarf2_per_objfile)
25134 struct dwarf2_per_cu_data *per_cu, **last_chain;
25136 dwarf2_clear_marks (dwarf2_per_objfile->read_in_chain);
25137 per_cu = dwarf2_per_objfile->read_in_chain;
25138 while (per_cu != NULL)
25140 per_cu->cu->last_used ++;
25141 if (per_cu->cu->last_used <= dwarf_max_cache_age)
25142 dwarf2_mark (per_cu->cu);
25143 per_cu = per_cu->cu->read_in_chain;
25146 per_cu = dwarf2_per_objfile->read_in_chain;
25147 last_chain = &dwarf2_per_objfile->read_in_chain;
25148 while (per_cu != NULL)
25150 struct dwarf2_per_cu_data *next_cu;
25152 next_cu = per_cu->cu->read_in_chain;
25154 if (!per_cu->cu->mark)
25157 *last_chain = next_cu;
25160 last_chain = &per_cu->cu->read_in_chain;
25166 /* Remove a single compilation unit from the cache. */
25169 free_one_cached_comp_unit (struct dwarf2_per_cu_data *target_per_cu)
25171 struct dwarf2_per_cu_data *per_cu, **last_chain;
25172 struct dwarf2_per_objfile *dwarf2_per_objfile
25173 = target_per_cu->dwarf2_per_objfile;
25175 per_cu = dwarf2_per_objfile->read_in_chain;
25176 last_chain = &dwarf2_per_objfile->read_in_chain;
25177 while (per_cu != NULL)
25179 struct dwarf2_per_cu_data *next_cu;
25181 next_cu = per_cu->cu->read_in_chain;
25183 if (per_cu == target_per_cu)
25187 *last_chain = next_cu;
25191 last_chain = &per_cu->cu->read_in_chain;
25197 /* Release all extra memory associated with OBJFILE. */
25200 dwarf2_free_objfile (struct objfile *objfile)
25202 struct dwarf2_per_objfile *dwarf2_per_objfile
25203 = get_dwarf2_per_objfile (objfile);
25205 if (dwarf2_per_objfile == NULL)
25208 dwarf2_per_objfile->~dwarf2_per_objfile ();
25211 /* A set of CU "per_cu" pointer, DIE offset, and GDB type pointer.
25212 We store these in a hash table separate from the DIEs, and preserve them
25213 when the DIEs are flushed out of cache.
25215 The CU "per_cu" pointer is needed because offset alone is not enough to
25216 uniquely identify the type. A file may have multiple .debug_types sections,
25217 or the type may come from a DWO file. Furthermore, while it's more logical
25218 to use per_cu->section+offset, with Fission the section with the data is in
25219 the DWO file but we don't know that section at the point we need it.
25220 We have to use something in dwarf2_per_cu_data (or the pointer to it)
25221 because we can enter the lookup routine, get_die_type_at_offset, from
25222 outside this file, and thus won't necessarily have PER_CU->cu.
25223 Fortunately, PER_CU is stable for the life of the objfile. */
25225 struct dwarf2_per_cu_offset_and_type
25227 const struct dwarf2_per_cu_data *per_cu;
25228 sect_offset sect_off;
25232 /* Hash function for a dwarf2_per_cu_offset_and_type. */
25235 per_cu_offset_and_type_hash (const void *item)
25237 const struct dwarf2_per_cu_offset_and_type *ofs
25238 = (const struct dwarf2_per_cu_offset_and_type *) item;
25240 return (uintptr_t) ofs->per_cu + to_underlying (ofs->sect_off);
25243 /* Equality function for a dwarf2_per_cu_offset_and_type. */
25246 per_cu_offset_and_type_eq (const void *item_lhs, const void *item_rhs)
25248 const struct dwarf2_per_cu_offset_and_type *ofs_lhs
25249 = (const struct dwarf2_per_cu_offset_and_type *) item_lhs;
25250 const struct dwarf2_per_cu_offset_and_type *ofs_rhs
25251 = (const struct dwarf2_per_cu_offset_and_type *) item_rhs;
25253 return (ofs_lhs->per_cu == ofs_rhs->per_cu
25254 && ofs_lhs->sect_off == ofs_rhs->sect_off);
25257 /* Set the type associated with DIE to TYPE. Save it in CU's hash
25258 table if necessary. For convenience, return TYPE.
25260 The DIEs reading must have careful ordering to:
25261 * Not cause infite loops trying to read in DIEs as a prerequisite for
25262 reading current DIE.
25263 * Not trying to dereference contents of still incompletely read in types
25264 while reading in other DIEs.
25265 * Enable referencing still incompletely read in types just by a pointer to
25266 the type without accessing its fields.
25268 Therefore caller should follow these rules:
25269 * Try to fetch any prerequisite types we may need to build this DIE type
25270 before building the type and calling set_die_type.
25271 * After building type call set_die_type for current DIE as soon as
25272 possible before fetching more types to complete the current type.
25273 * Make the type as complete as possible before fetching more types. */
25275 static struct type *
25276 set_die_type (struct die_info *die, struct type *type, struct dwarf2_cu *cu)
25278 struct dwarf2_per_objfile *dwarf2_per_objfile
25279 = cu->per_cu->dwarf2_per_objfile;
25280 struct dwarf2_per_cu_offset_and_type **slot, ofs;
25281 struct objfile *objfile = dwarf2_per_objfile->objfile;
25282 struct attribute *attr;
25283 struct dynamic_prop prop;
25285 /* For Ada types, make sure that the gnat-specific data is always
25286 initialized (if not already set). There are a few types where
25287 we should not be doing so, because the type-specific area is
25288 already used to hold some other piece of info (eg: TYPE_CODE_FLT
25289 where the type-specific area is used to store the floatformat).
25290 But this is not a problem, because the gnat-specific information
25291 is actually not needed for these types. */
25292 if (need_gnat_info (cu)
25293 && TYPE_CODE (type) != TYPE_CODE_FUNC
25294 && TYPE_CODE (type) != TYPE_CODE_FLT
25295 && TYPE_CODE (type) != TYPE_CODE_METHODPTR
25296 && TYPE_CODE (type) != TYPE_CODE_MEMBERPTR
25297 && TYPE_CODE (type) != TYPE_CODE_METHOD
25298 && !HAVE_GNAT_AUX_INFO (type))
25299 INIT_GNAT_SPECIFIC (type);
25301 /* Read DW_AT_allocated and set in type. */
25302 attr = dwarf2_attr (die, DW_AT_allocated, cu);
25303 if (attr_form_is_block (attr))
25305 if (attr_to_dynamic_prop (attr, die, cu, &prop))
25306 add_dyn_prop (DYN_PROP_ALLOCATED, prop, type);
25308 else if (attr != NULL)
25310 complaint (&symfile_complaints,
25311 _("DW_AT_allocated has the wrong form (%s) at DIE 0x%x"),
25312 (attr != NULL ? dwarf_form_name (attr->form) : "n/a"),
25313 to_underlying (die->sect_off));
25316 /* Read DW_AT_associated and set in type. */
25317 attr = dwarf2_attr (die, DW_AT_associated, cu);
25318 if (attr_form_is_block (attr))
25320 if (attr_to_dynamic_prop (attr, die, cu, &prop))
25321 add_dyn_prop (DYN_PROP_ASSOCIATED, prop, type);
25323 else if (attr != NULL)
25325 complaint (&symfile_complaints,
25326 _("DW_AT_associated has the wrong form (%s) at DIE 0x%x"),
25327 (attr != NULL ? dwarf_form_name (attr->form) : "n/a"),
25328 to_underlying (die->sect_off));
25331 /* Read DW_AT_data_location and set in type. */
25332 attr = dwarf2_attr (die, DW_AT_data_location, cu);
25333 if (attr_to_dynamic_prop (attr, die, cu, &prop))
25334 add_dyn_prop (DYN_PROP_DATA_LOCATION, prop, type);
25336 if (dwarf2_per_objfile->die_type_hash == NULL)
25338 dwarf2_per_objfile->die_type_hash =
25339 htab_create_alloc_ex (127,
25340 per_cu_offset_and_type_hash,
25341 per_cu_offset_and_type_eq,
25343 &objfile->objfile_obstack,
25344 hashtab_obstack_allocate,
25345 dummy_obstack_deallocate);
25348 ofs.per_cu = cu->per_cu;
25349 ofs.sect_off = die->sect_off;
25351 slot = (struct dwarf2_per_cu_offset_and_type **)
25352 htab_find_slot (dwarf2_per_objfile->die_type_hash, &ofs, INSERT);
25354 complaint (&symfile_complaints,
25355 _("A problem internal to GDB: DIE 0x%x has type already set"),
25356 to_underlying (die->sect_off));
25357 *slot = XOBNEW (&objfile->objfile_obstack,
25358 struct dwarf2_per_cu_offset_and_type);
25363 /* Look up the type for the die at SECT_OFF in PER_CU in die_type_hash,
25364 or return NULL if the die does not have a saved type. */
25366 static struct type *
25367 get_die_type_at_offset (sect_offset sect_off,
25368 struct dwarf2_per_cu_data *per_cu)
25370 struct dwarf2_per_cu_offset_and_type *slot, ofs;
25371 struct dwarf2_per_objfile *dwarf2_per_objfile = per_cu->dwarf2_per_objfile;
25373 if (dwarf2_per_objfile->die_type_hash == NULL)
25376 ofs.per_cu = per_cu;
25377 ofs.sect_off = sect_off;
25378 slot = ((struct dwarf2_per_cu_offset_and_type *)
25379 htab_find (dwarf2_per_objfile->die_type_hash, &ofs));
25386 /* Look up the type for DIE in CU in die_type_hash,
25387 or return NULL if DIE does not have a saved type. */
25389 static struct type *
25390 get_die_type (struct die_info *die, struct dwarf2_cu *cu)
25392 return get_die_type_at_offset (die->sect_off, cu->per_cu);
25395 /* Add a dependence relationship from CU to REF_PER_CU. */
25398 dwarf2_add_dependence (struct dwarf2_cu *cu,
25399 struct dwarf2_per_cu_data *ref_per_cu)
25403 if (cu->dependencies == NULL)
25405 = htab_create_alloc_ex (5, htab_hash_pointer, htab_eq_pointer,
25406 NULL, &cu->comp_unit_obstack,
25407 hashtab_obstack_allocate,
25408 dummy_obstack_deallocate);
25410 slot = htab_find_slot (cu->dependencies, ref_per_cu, INSERT);
25412 *slot = ref_per_cu;
25415 /* Subroutine of dwarf2_mark to pass to htab_traverse.
25416 Set the mark field in every compilation unit in the
25417 cache that we must keep because we are keeping CU. */
25420 dwarf2_mark_helper (void **slot, void *data)
25422 struct dwarf2_per_cu_data *per_cu;
25424 per_cu = (struct dwarf2_per_cu_data *) *slot;
25426 /* cu->dependencies references may not yet have been ever read if QUIT aborts
25427 reading of the chain. As such dependencies remain valid it is not much
25428 useful to track and undo them during QUIT cleanups. */
25429 if (per_cu->cu == NULL)
25432 if (per_cu->cu->mark)
25434 per_cu->cu->mark = 1;
25436 if (per_cu->cu->dependencies != NULL)
25437 htab_traverse (per_cu->cu->dependencies, dwarf2_mark_helper, NULL);
25442 /* Set the mark field in CU and in every other compilation unit in the
25443 cache that we must keep because we are keeping CU. */
25446 dwarf2_mark (struct dwarf2_cu *cu)
25451 if (cu->dependencies != NULL)
25452 htab_traverse (cu->dependencies, dwarf2_mark_helper, NULL);
25456 dwarf2_clear_marks (struct dwarf2_per_cu_data *per_cu)
25460 per_cu->cu->mark = 0;
25461 per_cu = per_cu->cu->read_in_chain;
25465 /* Trivial hash function for partial_die_info: the hash value of a DIE
25466 is its offset in .debug_info for this objfile. */
25469 partial_die_hash (const void *item)
25471 const struct partial_die_info *part_die
25472 = (const struct partial_die_info *) item;
25474 return to_underlying (part_die->sect_off);
25477 /* Trivial comparison function for partial_die_info structures: two DIEs
25478 are equal if they have the same offset. */
25481 partial_die_eq (const void *item_lhs, const void *item_rhs)
25483 const struct partial_die_info *part_die_lhs
25484 = (const struct partial_die_info *) item_lhs;
25485 const struct partial_die_info *part_die_rhs
25486 = (const struct partial_die_info *) item_rhs;
25488 return part_die_lhs->sect_off == part_die_rhs->sect_off;
25491 static struct cmd_list_element *set_dwarf_cmdlist;
25492 static struct cmd_list_element *show_dwarf_cmdlist;
25495 set_dwarf_cmd (const char *args, int from_tty)
25497 help_list (set_dwarf_cmdlist, "maintenance set dwarf ", all_commands,
25502 show_dwarf_cmd (const char *args, int from_tty)
25504 cmd_show_list (show_dwarf_cmdlist, from_tty, "");
25507 /* The "save gdb-index" command. */
25509 /* Write SIZE bytes from the buffer pointed to by DATA to FILE, with
25513 file_write (FILE *file, const void *data, size_t size)
25515 if (fwrite (data, 1, size, file) != size)
25516 error (_("couldn't data write to file"));
25519 /* Write the contents of VEC to FILE, with error checking. */
25521 template<typename Elem, typename Alloc>
25523 file_write (FILE *file, const std::vector<Elem, Alloc> &vec)
25525 file_write (file, vec.data (), vec.size () * sizeof (vec[0]));
25528 /* In-memory buffer to prepare data to be written later to a file. */
25532 /* Copy DATA to the end of the buffer. */
25533 template<typename T>
25534 void append_data (const T &data)
25536 std::copy (reinterpret_cast<const gdb_byte *> (&data),
25537 reinterpret_cast<const gdb_byte *> (&data + 1),
25538 grow (sizeof (data)));
25541 /* Copy CSTR (a zero-terminated string) to the end of buffer. The
25542 terminating zero is appended too. */
25543 void append_cstr0 (const char *cstr)
25545 const size_t size = strlen (cstr) + 1;
25546 std::copy (cstr, cstr + size, grow (size));
25549 /* Store INPUT as ULEB128 to the end of buffer. */
25550 void append_unsigned_leb128 (ULONGEST input)
25554 gdb_byte output = input & 0x7f;
25558 append_data (output);
25564 /* Accept a host-format integer in VAL and append it to the buffer
25565 as a target-format integer which is LEN bytes long. */
25566 void append_uint (size_t len, bfd_endian byte_order, ULONGEST val)
25568 ::store_unsigned_integer (grow (len), len, byte_order, val);
25571 /* Return the size of the buffer. */
25572 size_t size () const
25574 return m_vec.size ();
25577 /* Return true iff the buffer is empty. */
25578 bool empty () const
25580 return m_vec.empty ();
25583 /* Write the buffer to FILE. */
25584 void file_write (FILE *file) const
25586 ::file_write (file, m_vec);
25590 /* Grow SIZE bytes at the end of the buffer. Returns a pointer to
25591 the start of the new block. */
25592 gdb_byte *grow (size_t size)
25594 m_vec.resize (m_vec.size () + size);
25595 return &*m_vec.end () - size;
25598 gdb::byte_vector m_vec;
25601 /* An entry in the symbol table. */
25602 struct symtab_index_entry
25604 /* The name of the symbol. */
25606 /* The offset of the name in the constant pool. */
25607 offset_type index_offset;
25608 /* A sorted vector of the indices of all the CUs that hold an object
25610 std::vector<offset_type> cu_indices;
25613 /* The symbol table. This is a power-of-2-sized hash table. */
25614 struct mapped_symtab
25618 data.resize (1024);
25621 offset_type n_elements = 0;
25622 std::vector<symtab_index_entry> data;
25625 /* Find a slot in SYMTAB for the symbol NAME. Returns a reference to
25628 Function is used only during write_hash_table so no index format backward
25629 compatibility is needed. */
25631 static symtab_index_entry &
25632 find_slot (struct mapped_symtab *symtab, const char *name)
25634 offset_type index, step, hash = mapped_index_string_hash (INT_MAX, name);
25636 index = hash & (symtab->data.size () - 1);
25637 step = ((hash * 17) & (symtab->data.size () - 1)) | 1;
25641 if (symtab->data[index].name == NULL
25642 || strcmp (name, symtab->data[index].name) == 0)
25643 return symtab->data[index];
25644 index = (index + step) & (symtab->data.size () - 1);
25648 /* Expand SYMTAB's hash table. */
25651 hash_expand (struct mapped_symtab *symtab)
25653 auto old_entries = std::move (symtab->data);
25655 symtab->data.clear ();
25656 symtab->data.resize (old_entries.size () * 2);
25658 for (auto &it : old_entries)
25659 if (it.name != NULL)
25661 auto &ref = find_slot (symtab, it.name);
25662 ref = std::move (it);
25666 /* Add an entry to SYMTAB. NAME is the name of the symbol.
25667 CU_INDEX is the index of the CU in which the symbol appears.
25668 IS_STATIC is one if the symbol is static, otherwise zero (global). */
25671 add_index_entry (struct mapped_symtab *symtab, const char *name,
25672 int is_static, gdb_index_symbol_kind kind,
25673 offset_type cu_index)
25675 offset_type cu_index_and_attrs;
25677 ++symtab->n_elements;
25678 if (4 * symtab->n_elements / 3 >= symtab->data.size ())
25679 hash_expand (symtab);
25681 symtab_index_entry &slot = find_slot (symtab, name);
25682 if (slot.name == NULL)
25685 /* index_offset is set later. */
25688 cu_index_and_attrs = 0;
25689 DW2_GDB_INDEX_CU_SET_VALUE (cu_index_and_attrs, cu_index);
25690 DW2_GDB_INDEX_SYMBOL_STATIC_SET_VALUE (cu_index_and_attrs, is_static);
25691 DW2_GDB_INDEX_SYMBOL_KIND_SET_VALUE (cu_index_and_attrs, kind);
25693 /* We don't want to record an index value twice as we want to avoid the
25695 We process all global symbols and then all static symbols
25696 (which would allow us to avoid the duplication by only having to check
25697 the last entry pushed), but a symbol could have multiple kinds in one CU.
25698 To keep things simple we don't worry about the duplication here and
25699 sort and uniqufy the list after we've processed all symbols. */
25700 slot.cu_indices.push_back (cu_index_and_attrs);
25703 /* Sort and remove duplicates of all symbols' cu_indices lists. */
25706 uniquify_cu_indices (struct mapped_symtab *symtab)
25708 for (auto &entry : symtab->data)
25710 if (entry.name != NULL && !entry.cu_indices.empty ())
25712 auto &cu_indices = entry.cu_indices;
25713 std::sort (cu_indices.begin (), cu_indices.end ());
25714 auto from = std::unique (cu_indices.begin (), cu_indices.end ());
25715 cu_indices.erase (from, cu_indices.end ());
25720 /* A form of 'const char *' suitable for container keys. Only the
25721 pointer is stored. The strings themselves are compared, not the
25726 c_str_view (const char *cstr)
25730 bool operator== (const c_str_view &other) const
25732 return strcmp (m_cstr, other.m_cstr) == 0;
25735 /* Return the underlying C string. Note, the returned string is
25736 only a reference with lifetime of this object. */
25737 const char *c_str () const
25743 friend class c_str_view_hasher;
25744 const char *const m_cstr;
25747 /* A std::unordered_map::hasher for c_str_view that uses the right
25748 hash function for strings in a mapped index. */
25749 class c_str_view_hasher
25752 size_t operator () (const c_str_view &x) const
25754 return mapped_index_string_hash (INT_MAX, x.m_cstr);
25758 /* A std::unordered_map::hasher for std::vector<>. */
25759 template<typename T>
25760 class vector_hasher
25763 size_t operator () (const std::vector<T> &key) const
25765 return iterative_hash (key.data (),
25766 sizeof (key.front ()) * key.size (), 0);
25770 /* Write the mapped hash table SYMTAB to the data buffer OUTPUT, with
25771 constant pool entries going into the data buffer CPOOL. */
25774 write_hash_table (mapped_symtab *symtab, data_buf &output, data_buf &cpool)
25777 /* Elements are sorted vectors of the indices of all the CUs that
25778 hold an object of this name. */
25779 std::unordered_map<std::vector<offset_type>, offset_type,
25780 vector_hasher<offset_type>>
25783 /* We add all the index vectors to the constant pool first, to
25784 ensure alignment is ok. */
25785 for (symtab_index_entry &entry : symtab->data)
25787 if (entry.name == NULL)
25789 gdb_assert (entry.index_offset == 0);
25791 /* Finding before inserting is faster than always trying to
25792 insert, because inserting always allocates a node, does the
25793 lookup, and then destroys the new node if another node
25794 already had the same key. C++17 try_emplace will avoid
25797 = symbol_hash_table.find (entry.cu_indices);
25798 if (found != symbol_hash_table.end ())
25800 entry.index_offset = found->second;
25804 symbol_hash_table.emplace (entry.cu_indices, cpool.size ());
25805 entry.index_offset = cpool.size ();
25806 cpool.append_data (MAYBE_SWAP (entry.cu_indices.size ()));
25807 for (const auto index : entry.cu_indices)
25808 cpool.append_data (MAYBE_SWAP (index));
25812 /* Now write out the hash table. */
25813 std::unordered_map<c_str_view, offset_type, c_str_view_hasher> str_table;
25814 for (const auto &entry : symtab->data)
25816 offset_type str_off, vec_off;
25818 if (entry.name != NULL)
25820 const auto insertpair = str_table.emplace (entry.name, cpool.size ());
25821 if (insertpair.second)
25822 cpool.append_cstr0 (entry.name);
25823 str_off = insertpair.first->second;
25824 vec_off = entry.index_offset;
25828 /* While 0 is a valid constant pool index, it is not valid
25829 to have 0 for both offsets. */
25834 output.append_data (MAYBE_SWAP (str_off));
25835 output.append_data (MAYBE_SWAP (vec_off));
25839 typedef std::unordered_map<partial_symtab *, unsigned int> psym_index_map;
25841 /* Helper struct for building the address table. */
25842 struct addrmap_index_data
25844 addrmap_index_data (data_buf &addr_vec_, psym_index_map &cu_index_htab_)
25845 : addr_vec (addr_vec_), cu_index_htab (cu_index_htab_)
25848 struct objfile *objfile;
25849 data_buf &addr_vec;
25850 psym_index_map &cu_index_htab;
25852 /* Non-zero if the previous_* fields are valid.
25853 We can't write an entry until we see the next entry (since it is only then
25854 that we know the end of the entry). */
25855 int previous_valid;
25856 /* Index of the CU in the table of all CUs in the index file. */
25857 unsigned int previous_cu_index;
25858 /* Start address of the CU. */
25859 CORE_ADDR previous_cu_start;
25862 /* Write an address entry to ADDR_VEC. */
25865 add_address_entry (struct objfile *objfile, data_buf &addr_vec,
25866 CORE_ADDR start, CORE_ADDR end, unsigned int cu_index)
25868 CORE_ADDR baseaddr;
25870 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
25872 addr_vec.append_uint (8, BFD_ENDIAN_LITTLE, start - baseaddr);
25873 addr_vec.append_uint (8, BFD_ENDIAN_LITTLE, end - baseaddr);
25874 addr_vec.append_data (MAYBE_SWAP (cu_index));
25877 /* Worker function for traversing an addrmap to build the address table. */
25880 add_address_entry_worker (void *datap, CORE_ADDR start_addr, void *obj)
25882 struct addrmap_index_data *data = (struct addrmap_index_data *) datap;
25883 struct partial_symtab *pst = (struct partial_symtab *) obj;
25885 if (data->previous_valid)
25886 add_address_entry (data->objfile, data->addr_vec,
25887 data->previous_cu_start, start_addr,
25888 data->previous_cu_index);
25890 data->previous_cu_start = start_addr;
25893 const auto it = data->cu_index_htab.find (pst);
25894 gdb_assert (it != data->cu_index_htab.cend ());
25895 data->previous_cu_index = it->second;
25896 data->previous_valid = 1;
25899 data->previous_valid = 0;
25904 /* Write OBJFILE's address map to ADDR_VEC.
25905 CU_INDEX_HTAB is used to map addrmap entries to their CU indices
25906 in the index file. */
25909 write_address_map (struct objfile *objfile, data_buf &addr_vec,
25910 psym_index_map &cu_index_htab)
25912 struct addrmap_index_data addrmap_index_data (addr_vec, cu_index_htab);
25914 /* When writing the address table, we have to cope with the fact that
25915 the addrmap iterator only provides the start of a region; we have to
25916 wait until the next invocation to get the start of the next region. */
25918 addrmap_index_data.objfile = objfile;
25919 addrmap_index_data.previous_valid = 0;
25921 addrmap_foreach (objfile->psymtabs_addrmap, add_address_entry_worker,
25922 &addrmap_index_data);
25924 /* It's highly unlikely the last entry (end address = 0xff...ff)
25925 is valid, but we should still handle it.
25926 The end address is recorded as the start of the next region, but that
25927 doesn't work here. To cope we pass 0xff...ff, this is a rare situation
25929 if (addrmap_index_data.previous_valid)
25930 add_address_entry (objfile, addr_vec,
25931 addrmap_index_data.previous_cu_start, (CORE_ADDR) -1,
25932 addrmap_index_data.previous_cu_index);
25935 /* Return the symbol kind of PSYM. */
25937 static gdb_index_symbol_kind
25938 symbol_kind (struct partial_symbol *psym)
25940 domain_enum domain = PSYMBOL_DOMAIN (psym);
25941 enum address_class aclass = PSYMBOL_CLASS (psym);
25949 return GDB_INDEX_SYMBOL_KIND_FUNCTION;
25951 return GDB_INDEX_SYMBOL_KIND_TYPE;
25953 case LOC_CONST_BYTES:
25954 case LOC_OPTIMIZED_OUT:
25956 return GDB_INDEX_SYMBOL_KIND_VARIABLE;
25958 /* Note: It's currently impossible to recognize psyms as enum values
25959 short of reading the type info. For now punt. */
25960 return GDB_INDEX_SYMBOL_KIND_VARIABLE;
25962 /* There are other LOC_FOO values that one might want to classify
25963 as variables, but dwarf2read.c doesn't currently use them. */
25964 return GDB_INDEX_SYMBOL_KIND_OTHER;
25966 case STRUCT_DOMAIN:
25967 return GDB_INDEX_SYMBOL_KIND_TYPE;
25969 return GDB_INDEX_SYMBOL_KIND_OTHER;
25973 /* Add a list of partial symbols to SYMTAB. */
25976 write_psymbols (struct mapped_symtab *symtab,
25977 std::unordered_set<partial_symbol *> &psyms_seen,
25978 struct partial_symbol **psymp,
25980 offset_type cu_index,
25983 for (; count-- > 0; ++psymp)
25985 struct partial_symbol *psym = *psymp;
25987 if (SYMBOL_LANGUAGE (psym) == language_ada)
25988 error (_("Ada is not currently supported by the index"));
25990 /* Only add a given psymbol once. */
25991 if (psyms_seen.insert (psym).second)
25993 gdb_index_symbol_kind kind = symbol_kind (psym);
25995 add_index_entry (symtab, SYMBOL_SEARCH_NAME (psym),
25996 is_static, kind, cu_index);
26001 /* A helper struct used when iterating over debug_types. */
26002 struct signatured_type_index_data
26004 signatured_type_index_data (data_buf &types_list_,
26005 std::unordered_set<partial_symbol *> &psyms_seen_)
26006 : types_list (types_list_), psyms_seen (psyms_seen_)
26009 struct objfile *objfile;
26010 struct mapped_symtab *symtab;
26011 data_buf &types_list;
26012 std::unordered_set<partial_symbol *> &psyms_seen;
26016 /* A helper function that writes a single signatured_type to an
26020 write_one_signatured_type (void **slot, void *d)
26022 struct signatured_type_index_data *info
26023 = (struct signatured_type_index_data *) d;
26024 struct signatured_type *entry = (struct signatured_type *) *slot;
26025 struct partial_symtab *psymtab = entry->per_cu.v.psymtab;
26027 write_psymbols (info->symtab,
26029 &info->objfile->global_psymbols[psymtab->globals_offset],
26030 psymtab->n_global_syms, info->cu_index,
26032 write_psymbols (info->symtab,
26034 &info->objfile->static_psymbols[psymtab->statics_offset],
26035 psymtab->n_static_syms, info->cu_index,
26038 info->types_list.append_uint (8, BFD_ENDIAN_LITTLE,
26039 to_underlying (entry->per_cu.sect_off));
26040 info->types_list.append_uint (8, BFD_ENDIAN_LITTLE,
26041 to_underlying (entry->type_offset_in_tu));
26042 info->types_list.append_uint (8, BFD_ENDIAN_LITTLE, entry->signature);
26049 /* Recurse into all "included" dependencies and count their symbols as
26050 if they appeared in this psymtab. */
26053 recursively_count_psymbols (struct partial_symtab *psymtab,
26054 size_t &psyms_seen)
26056 for (int i = 0; i < psymtab->number_of_dependencies; ++i)
26057 if (psymtab->dependencies[i]->user != NULL)
26058 recursively_count_psymbols (psymtab->dependencies[i],
26061 psyms_seen += psymtab->n_global_syms;
26062 psyms_seen += psymtab->n_static_syms;
26065 /* Recurse into all "included" dependencies and write their symbols as
26066 if they appeared in this psymtab. */
26069 recursively_write_psymbols (struct objfile *objfile,
26070 struct partial_symtab *psymtab,
26071 struct mapped_symtab *symtab,
26072 std::unordered_set<partial_symbol *> &psyms_seen,
26073 offset_type cu_index)
26077 for (i = 0; i < psymtab->number_of_dependencies; ++i)
26078 if (psymtab->dependencies[i]->user != NULL)
26079 recursively_write_psymbols (objfile, psymtab->dependencies[i],
26080 symtab, psyms_seen, cu_index);
26082 write_psymbols (symtab,
26084 &objfile->global_psymbols[psymtab->globals_offset],
26085 psymtab->n_global_syms, cu_index,
26087 write_psymbols (symtab,
26089 &objfile->static_psymbols[psymtab->statics_offset],
26090 psymtab->n_static_syms, cu_index,
26094 /* DWARF-5 .debug_names builder. */
26098 debug_names (struct dwarf2_per_objfile *dwarf2_per_objfile, bool is_dwarf64,
26099 bfd_endian dwarf5_byte_order)
26100 : m_dwarf5_byte_order (dwarf5_byte_order),
26101 m_dwarf32 (dwarf5_byte_order),
26102 m_dwarf64 (dwarf5_byte_order),
26103 m_dwarf (is_dwarf64
26104 ? static_cast<dwarf &> (m_dwarf64)
26105 : static_cast<dwarf &> (m_dwarf32)),
26106 m_name_table_string_offs (m_dwarf.name_table_string_offs),
26107 m_name_table_entry_offs (m_dwarf.name_table_entry_offs),
26108 m_debugstrlookup (dwarf2_per_objfile)
26111 int dwarf5_offset_size () const
26113 const bool dwarf5_is_dwarf64 = &m_dwarf == &m_dwarf64;
26114 return dwarf5_is_dwarf64 ? 8 : 4;
26117 /* Is this symbol from DW_TAG_compile_unit or DW_TAG_type_unit? */
26118 enum class unit_kind { cu, tu };
26120 /* Insert one symbol. */
26121 void insert (const partial_symbol *psym, int cu_index, bool is_static,
26124 const int dwarf_tag = psymbol_tag (psym);
26125 if (dwarf_tag == 0)
26127 const char *const name = SYMBOL_SEARCH_NAME (psym);
26128 const auto insertpair
26129 = m_name_to_value_set.emplace (c_str_view (name),
26130 std::set<symbol_value> ());
26131 std::set<symbol_value> &value_set = insertpair.first->second;
26132 value_set.emplace (symbol_value (dwarf_tag, cu_index, is_static, kind));
26135 /* Build all the tables. All symbols must be already inserted.
26136 This function does not call file_write, caller has to do it
26140 /* Verify the build method has not be called twice. */
26141 gdb_assert (m_abbrev_table.empty ());
26142 const size_t name_count = m_name_to_value_set.size ();
26143 m_bucket_table.resize
26144 (std::pow (2, std::ceil (std::log2 (name_count * 4 / 3))));
26145 m_hash_table.reserve (name_count);
26146 m_name_table_string_offs.reserve (name_count);
26147 m_name_table_entry_offs.reserve (name_count);
26149 /* Map each hash of symbol to its name and value. */
26150 struct hash_it_pair
26153 decltype (m_name_to_value_set)::const_iterator it;
26155 std::vector<std::forward_list<hash_it_pair>> bucket_hash;
26156 bucket_hash.resize (m_bucket_table.size ());
26157 for (decltype (m_name_to_value_set)::const_iterator it
26158 = m_name_to_value_set.cbegin ();
26159 it != m_name_to_value_set.cend ();
26162 const char *const name = it->first.c_str ();
26163 const uint32_t hash = dwarf5_djb_hash (name);
26164 hash_it_pair hashitpair;
26165 hashitpair.hash = hash;
26166 hashitpair.it = it;
26167 auto &slot = bucket_hash[hash % bucket_hash.size()];
26168 slot.push_front (std::move (hashitpair));
26170 for (size_t bucket_ix = 0; bucket_ix < bucket_hash.size (); ++bucket_ix)
26172 const std::forward_list<hash_it_pair> &hashitlist
26173 = bucket_hash[bucket_ix];
26174 if (hashitlist.empty ())
26176 uint32_t &bucket_slot = m_bucket_table[bucket_ix];
26177 /* The hashes array is indexed starting at 1. */
26178 store_unsigned_integer (reinterpret_cast<gdb_byte *> (&bucket_slot),
26179 sizeof (bucket_slot), m_dwarf5_byte_order,
26180 m_hash_table.size () + 1);
26181 for (const hash_it_pair &hashitpair : hashitlist)
26183 m_hash_table.push_back (0);
26184 store_unsigned_integer (reinterpret_cast<gdb_byte *>
26185 (&m_hash_table.back ()),
26186 sizeof (m_hash_table.back ()),
26187 m_dwarf5_byte_order, hashitpair.hash);
26188 const c_str_view &name = hashitpair.it->first;
26189 const std::set<symbol_value> &value_set = hashitpair.it->second;
26190 m_name_table_string_offs.push_back_reorder
26191 (m_debugstrlookup.lookup (name.c_str ()));
26192 m_name_table_entry_offs.push_back_reorder (m_entry_pool.size ());
26193 gdb_assert (!value_set.empty ());
26194 for (const symbol_value &value : value_set)
26196 int &idx = m_indexkey_to_idx[index_key (value.dwarf_tag,
26201 idx = m_idx_next++;
26202 m_abbrev_table.append_unsigned_leb128 (idx);
26203 m_abbrev_table.append_unsigned_leb128 (value.dwarf_tag);
26204 m_abbrev_table.append_unsigned_leb128
26205 (value.kind == unit_kind::cu ? DW_IDX_compile_unit
26206 : DW_IDX_type_unit);
26207 m_abbrev_table.append_unsigned_leb128 (DW_FORM_udata);
26208 m_abbrev_table.append_unsigned_leb128 (value.is_static
26209 ? DW_IDX_GNU_internal
26210 : DW_IDX_GNU_external);
26211 m_abbrev_table.append_unsigned_leb128 (DW_FORM_flag_present);
26213 /* Terminate attributes list. */
26214 m_abbrev_table.append_unsigned_leb128 (0);
26215 m_abbrev_table.append_unsigned_leb128 (0);
26218 m_entry_pool.append_unsigned_leb128 (idx);
26219 m_entry_pool.append_unsigned_leb128 (value.cu_index);
26222 /* Terminate the list of CUs. */
26223 m_entry_pool.append_unsigned_leb128 (0);
26226 gdb_assert (m_hash_table.size () == name_count);
26228 /* Terminate tags list. */
26229 m_abbrev_table.append_unsigned_leb128 (0);
26232 /* Return .debug_names bucket count. This must be called only after
26233 calling the build method. */
26234 uint32_t bucket_count () const
26236 /* Verify the build method has been already called. */
26237 gdb_assert (!m_abbrev_table.empty ());
26238 const uint32_t retval = m_bucket_table.size ();
26240 /* Check for overflow. */
26241 gdb_assert (retval == m_bucket_table.size ());
26245 /* Return .debug_names names count. This must be called only after
26246 calling the build method. */
26247 uint32_t name_count () const
26249 /* Verify the build method has been already called. */
26250 gdb_assert (!m_abbrev_table.empty ());
26251 const uint32_t retval = m_hash_table.size ();
26253 /* Check for overflow. */
26254 gdb_assert (retval == m_hash_table.size ());
26258 /* Return number of bytes of .debug_names abbreviation table. This
26259 must be called only after calling the build method. */
26260 uint32_t abbrev_table_bytes () const
26262 gdb_assert (!m_abbrev_table.empty ());
26263 return m_abbrev_table.size ();
26266 /* Recurse into all "included" dependencies and store their symbols
26267 as if they appeared in this psymtab. */
26268 void recursively_write_psymbols
26269 (struct objfile *objfile,
26270 struct partial_symtab *psymtab,
26271 std::unordered_set<partial_symbol *> &psyms_seen,
26274 for (int i = 0; i < psymtab->number_of_dependencies; ++i)
26275 if (psymtab->dependencies[i]->user != NULL)
26276 recursively_write_psymbols (objfile, psymtab->dependencies[i],
26277 psyms_seen, cu_index);
26279 write_psymbols (psyms_seen,
26280 &objfile->global_psymbols[psymtab->globals_offset],
26281 psymtab->n_global_syms, cu_index, false, unit_kind::cu);
26282 write_psymbols (psyms_seen,
26283 &objfile->static_psymbols[psymtab->statics_offset],
26284 psymtab->n_static_syms, cu_index, true, unit_kind::cu);
26287 /* Return number of bytes the .debug_names section will have. This
26288 must be called only after calling the build method. */
26289 size_t bytes () const
26291 /* Verify the build method has been already called. */
26292 gdb_assert (!m_abbrev_table.empty ());
26293 size_t expected_bytes = 0;
26294 expected_bytes += m_bucket_table.size () * sizeof (m_bucket_table[0]);
26295 expected_bytes += m_hash_table.size () * sizeof (m_hash_table[0]);
26296 expected_bytes += m_name_table_string_offs.bytes ();
26297 expected_bytes += m_name_table_entry_offs.bytes ();
26298 expected_bytes += m_abbrev_table.size ();
26299 expected_bytes += m_entry_pool.size ();
26300 return expected_bytes;
26303 /* Write .debug_names to FILE_NAMES and .debug_str addition to
26304 FILE_STR. This must be called only after calling the build
26306 void file_write (FILE *file_names, FILE *file_str) const
26308 /* Verify the build method has been already called. */
26309 gdb_assert (!m_abbrev_table.empty ());
26310 ::file_write (file_names, m_bucket_table);
26311 ::file_write (file_names, m_hash_table);
26312 m_name_table_string_offs.file_write (file_names);
26313 m_name_table_entry_offs.file_write (file_names);
26314 m_abbrev_table.file_write (file_names);
26315 m_entry_pool.file_write (file_names);
26316 m_debugstrlookup.file_write (file_str);
26319 /* A helper user data for write_one_signatured_type. */
26320 class write_one_signatured_type_data
26323 write_one_signatured_type_data (debug_names &nametable_,
26324 signatured_type_index_data &&info_)
26325 : nametable (nametable_), info (std::move (info_))
26327 debug_names &nametable;
26328 struct signatured_type_index_data info;
26331 /* A helper function to pass write_one_signatured_type to
26332 htab_traverse_noresize. */
26334 write_one_signatured_type (void **slot, void *d)
26336 write_one_signatured_type_data *data = (write_one_signatured_type_data *) d;
26337 struct signatured_type_index_data *info = &data->info;
26338 struct signatured_type *entry = (struct signatured_type *) *slot;
26340 data->nametable.write_one_signatured_type (entry, info);
26347 /* Storage for symbol names mapping them to their .debug_str section
26349 class debug_str_lookup
26353 /* Object costructor to be called for current DWARF2_PER_OBJFILE.
26354 All .debug_str section strings are automatically stored. */
26355 debug_str_lookup (struct dwarf2_per_objfile *dwarf2_per_objfile)
26356 : m_abfd (dwarf2_per_objfile->objfile->obfd),
26357 m_dwarf2_per_objfile (dwarf2_per_objfile)
26359 dwarf2_read_section (dwarf2_per_objfile->objfile,
26360 &dwarf2_per_objfile->str);
26361 if (dwarf2_per_objfile->str.buffer == NULL)
26363 for (const gdb_byte *data = dwarf2_per_objfile->str.buffer;
26364 data < (dwarf2_per_objfile->str.buffer
26365 + dwarf2_per_objfile->str.size);)
26367 const char *const s = reinterpret_cast<const char *> (data);
26368 const auto insertpair
26369 = m_str_table.emplace (c_str_view (s),
26370 data - dwarf2_per_objfile->str.buffer);
26371 if (!insertpair.second)
26372 complaint (&symfile_complaints,
26373 _("Duplicate string \"%s\" in "
26374 ".debug_str section [in module %s]"),
26375 s, bfd_get_filename (m_abfd));
26376 data += strlen (s) + 1;
26380 /* Return offset of symbol name S in the .debug_str section. Add
26381 such symbol to the section's end if it does not exist there
26383 size_t lookup (const char *s)
26385 const auto it = m_str_table.find (c_str_view (s));
26386 if (it != m_str_table.end ())
26388 const size_t offset = (m_dwarf2_per_objfile->str.size
26389 + m_str_add_buf.size ());
26390 m_str_table.emplace (c_str_view (s), offset);
26391 m_str_add_buf.append_cstr0 (s);
26395 /* Append the end of the .debug_str section to FILE. */
26396 void file_write (FILE *file) const
26398 m_str_add_buf.file_write (file);
26402 std::unordered_map<c_str_view, size_t, c_str_view_hasher> m_str_table;
26404 struct dwarf2_per_objfile *m_dwarf2_per_objfile;
26406 /* Data to add at the end of .debug_str for new needed symbol names. */
26407 data_buf m_str_add_buf;
26410 /* Container to map used DWARF tags to their .debug_names abbreviation
26415 index_key (int dwarf_tag_, bool is_static_, unit_kind kind_)
26416 : dwarf_tag (dwarf_tag_), is_static (is_static_), kind (kind_)
26421 operator== (const index_key &other) const
26423 return (dwarf_tag == other.dwarf_tag && is_static == other.is_static
26424 && kind == other.kind);
26427 const int dwarf_tag;
26428 const bool is_static;
26429 const unit_kind kind;
26432 /* Provide std::unordered_map::hasher for index_key. */
26433 class index_key_hasher
26437 operator () (const index_key &key) const
26439 return (std::hash<int>() (key.dwarf_tag) << 1) | key.is_static;
26443 /* Parameters of one symbol entry. */
26447 const int dwarf_tag, cu_index;
26448 const bool is_static;
26449 const unit_kind kind;
26451 symbol_value (int dwarf_tag_, int cu_index_, bool is_static_,
26453 : dwarf_tag (dwarf_tag_), cu_index (cu_index_), is_static (is_static_),
26458 operator< (const symbol_value &other) const
26478 /* Abstract base class to unify DWARF-32 and DWARF-64 name table
26483 const bfd_endian dwarf5_byte_order;
26485 explicit offset_vec (bfd_endian dwarf5_byte_order_)
26486 : dwarf5_byte_order (dwarf5_byte_order_)
26489 /* Call std::vector::reserve for NELEM elements. */
26490 virtual void reserve (size_t nelem) = 0;
26492 /* Call std::vector::push_back with store_unsigned_integer byte
26493 reordering for ELEM. */
26494 virtual void push_back_reorder (size_t elem) = 0;
26496 /* Return expected output size in bytes. */
26497 virtual size_t bytes () const = 0;
26499 /* Write name table to FILE. */
26500 virtual void file_write (FILE *file) const = 0;
26503 /* Template to unify DWARF-32 and DWARF-64 output. */
26504 template<typename OffsetSize>
26505 class offset_vec_tmpl : public offset_vec
26508 explicit offset_vec_tmpl (bfd_endian dwarf5_byte_order_)
26509 : offset_vec (dwarf5_byte_order_)
26512 /* Implement offset_vec::reserve. */
26513 void reserve (size_t nelem) override
26515 m_vec.reserve (nelem);
26518 /* Implement offset_vec::push_back_reorder. */
26519 void push_back_reorder (size_t elem) override
26521 m_vec.push_back (elem);
26522 /* Check for overflow. */
26523 gdb_assert (m_vec.back () == elem);
26524 store_unsigned_integer (reinterpret_cast<gdb_byte *> (&m_vec.back ()),
26525 sizeof (m_vec.back ()), dwarf5_byte_order, elem);
26528 /* Implement offset_vec::bytes. */
26529 size_t bytes () const override
26531 return m_vec.size () * sizeof (m_vec[0]);
26534 /* Implement offset_vec::file_write. */
26535 void file_write (FILE *file) const override
26537 ::file_write (file, m_vec);
26541 std::vector<OffsetSize> m_vec;
26544 /* Base class to unify DWARF-32 and DWARF-64 .debug_names output
26545 respecting name table width. */
26549 offset_vec &name_table_string_offs, &name_table_entry_offs;
26551 dwarf (offset_vec &name_table_string_offs_,
26552 offset_vec &name_table_entry_offs_)
26553 : name_table_string_offs (name_table_string_offs_),
26554 name_table_entry_offs (name_table_entry_offs_)
26559 /* Template to unify DWARF-32 and DWARF-64 .debug_names output
26560 respecting name table width. */
26561 template<typename OffsetSize>
26562 class dwarf_tmpl : public dwarf
26565 explicit dwarf_tmpl (bfd_endian dwarf5_byte_order_)
26566 : dwarf (m_name_table_string_offs, m_name_table_entry_offs),
26567 m_name_table_string_offs (dwarf5_byte_order_),
26568 m_name_table_entry_offs (dwarf5_byte_order_)
26572 offset_vec_tmpl<OffsetSize> m_name_table_string_offs;
26573 offset_vec_tmpl<OffsetSize> m_name_table_entry_offs;
26576 /* Try to reconstruct original DWARF tag for given partial_symbol.
26577 This function is not DWARF-5 compliant but it is sufficient for
26578 GDB as a DWARF-5 index consumer. */
26579 static int psymbol_tag (const struct partial_symbol *psym)
26581 domain_enum domain = PSYMBOL_DOMAIN (psym);
26582 enum address_class aclass = PSYMBOL_CLASS (psym);
26590 return DW_TAG_subprogram;
26592 return DW_TAG_typedef;
26594 case LOC_CONST_BYTES:
26595 case LOC_OPTIMIZED_OUT:
26597 return DW_TAG_variable;
26599 /* Note: It's currently impossible to recognize psyms as enum values
26600 short of reading the type info. For now punt. */
26601 return DW_TAG_variable;
26603 /* There are other LOC_FOO values that one might want to classify
26604 as variables, but dwarf2read.c doesn't currently use them. */
26605 return DW_TAG_variable;
26607 case STRUCT_DOMAIN:
26608 return DW_TAG_structure_type;
26614 /* Call insert for all partial symbols and mark them in PSYMS_SEEN. */
26615 void write_psymbols (std::unordered_set<partial_symbol *> &psyms_seen,
26616 struct partial_symbol **psymp, int count, int cu_index,
26617 bool is_static, unit_kind kind)
26619 for (; count-- > 0; ++psymp)
26621 struct partial_symbol *psym = *psymp;
26623 if (SYMBOL_LANGUAGE (psym) == language_ada)
26624 error (_("Ada is not currently supported by the index"));
26626 /* Only add a given psymbol once. */
26627 if (psyms_seen.insert (psym).second)
26628 insert (psym, cu_index, is_static, kind);
26632 /* A helper function that writes a single signatured_type
26633 to a debug_names. */
26635 write_one_signatured_type (struct signatured_type *entry,
26636 struct signatured_type_index_data *info)
26638 struct partial_symtab *psymtab = entry->per_cu.v.psymtab;
26640 write_psymbols (info->psyms_seen,
26641 &info->objfile->global_psymbols[psymtab->globals_offset],
26642 psymtab->n_global_syms, info->cu_index, false,
26644 write_psymbols (info->psyms_seen,
26645 &info->objfile->static_psymbols[psymtab->statics_offset],
26646 psymtab->n_static_syms, info->cu_index, true,
26649 info->types_list.append_uint (dwarf5_offset_size (), m_dwarf5_byte_order,
26650 to_underlying (entry->per_cu.sect_off));
26655 /* Store value of each symbol. */
26656 std::unordered_map<c_str_view, std::set<symbol_value>, c_str_view_hasher>
26657 m_name_to_value_set;
26659 /* Tables of DWARF-5 .debug_names. They are in object file byte
26661 std::vector<uint32_t> m_bucket_table;
26662 std::vector<uint32_t> m_hash_table;
26664 const bfd_endian m_dwarf5_byte_order;
26665 dwarf_tmpl<uint32_t> m_dwarf32;
26666 dwarf_tmpl<uint64_t> m_dwarf64;
26668 offset_vec &m_name_table_string_offs, &m_name_table_entry_offs;
26669 debug_str_lookup m_debugstrlookup;
26671 /* Map each used .debug_names abbreviation tag parameter to its
26673 std::unordered_map<index_key, int, index_key_hasher> m_indexkey_to_idx;
26675 /* Next unused .debug_names abbreviation tag for
26676 m_indexkey_to_idx. */
26677 int m_idx_next = 1;
26679 /* .debug_names abbreviation table. */
26680 data_buf m_abbrev_table;
26682 /* .debug_names entry pool. */
26683 data_buf m_entry_pool;
26686 /* Return iff any of the needed offsets does not fit into 32-bit
26687 .debug_names section. */
26690 check_dwarf64_offsets (struct dwarf2_per_objfile *dwarf2_per_objfile)
26692 for (int i = 0; i < dwarf2_per_objfile->n_comp_units; ++i)
26694 const dwarf2_per_cu_data &per_cu = *dwarf2_per_objfile->all_comp_units[i];
26696 if (to_underlying (per_cu.sect_off) >= (static_cast<uint64_t> (1) << 32))
26699 for (int i = 0; i < dwarf2_per_objfile->n_type_units; ++i)
26701 const signatured_type &sigtype = *dwarf2_per_objfile->all_type_units[i];
26702 const dwarf2_per_cu_data &per_cu = sigtype.per_cu;
26704 if (to_underlying (per_cu.sect_off) >= (static_cast<uint64_t> (1) << 32))
26710 /* The psyms_seen set is potentially going to be largish (~40k
26711 elements when indexing a -g3 build of GDB itself). Estimate the
26712 number of elements in order to avoid too many rehashes, which
26713 require rebuilding buckets and thus many trips to
26717 psyms_seen_size (struct dwarf2_per_objfile *dwarf2_per_objfile)
26719 size_t psyms_count = 0;
26720 for (int i = 0; i < dwarf2_per_objfile->n_comp_units; ++i)
26722 struct dwarf2_per_cu_data *per_cu
26723 = dwarf2_per_objfile->all_comp_units[i];
26724 struct partial_symtab *psymtab = per_cu->v.psymtab;
26726 if (psymtab != NULL && psymtab->user == NULL)
26727 recursively_count_psymbols (psymtab, psyms_count);
26729 /* Generating an index for gdb itself shows a ratio of
26730 TOTAL_SEEN_SYMS/UNIQUE_SYMS or ~5. 4 seems like a good bet. */
26731 return psyms_count / 4;
26734 /* Write new .gdb_index section for OBJFILE into OUT_FILE.
26735 Return how many bytes were expected to be written into OUT_FILE. */
26738 write_gdbindex (struct dwarf2_per_objfile *dwarf2_per_objfile, FILE *out_file)
26740 struct objfile *objfile = dwarf2_per_objfile->objfile;
26741 mapped_symtab symtab;
26744 /* While we're scanning CU's create a table that maps a psymtab pointer
26745 (which is what addrmap records) to its index (which is what is recorded
26746 in the index file). This will later be needed to write the address
26748 psym_index_map cu_index_htab;
26749 cu_index_htab.reserve (dwarf2_per_objfile->n_comp_units);
26751 /* The CU list is already sorted, so we don't need to do additional
26752 work here. Also, the debug_types entries do not appear in
26753 all_comp_units, but only in their own hash table. */
26755 std::unordered_set<partial_symbol *> psyms_seen
26756 (psyms_seen_size (dwarf2_per_objfile));
26757 for (int i = 0; i < dwarf2_per_objfile->n_comp_units; ++i)
26759 struct dwarf2_per_cu_data *per_cu
26760 = dwarf2_per_objfile->all_comp_units[i];
26761 struct partial_symtab *psymtab = per_cu->v.psymtab;
26763 /* CU of a shared file from 'dwz -m' may be unused by this main file.
26764 It may be referenced from a local scope but in such case it does not
26765 need to be present in .gdb_index. */
26766 if (psymtab == NULL)
26769 if (psymtab->user == NULL)
26770 recursively_write_psymbols (objfile, psymtab, &symtab,
26773 const auto insertpair = cu_index_htab.emplace (psymtab, i);
26774 gdb_assert (insertpair.second);
26776 cu_list.append_uint (8, BFD_ENDIAN_LITTLE,
26777 to_underlying (per_cu->sect_off));
26778 cu_list.append_uint (8, BFD_ENDIAN_LITTLE, per_cu->length);
26781 /* Dump the address map. */
26783 write_address_map (objfile, addr_vec, cu_index_htab);
26785 /* Write out the .debug_type entries, if any. */
26786 data_buf types_cu_list;
26787 if (dwarf2_per_objfile->signatured_types)
26789 signatured_type_index_data sig_data (types_cu_list,
26792 sig_data.objfile = objfile;
26793 sig_data.symtab = &symtab;
26794 sig_data.cu_index = dwarf2_per_objfile->n_comp_units;
26795 htab_traverse_noresize (dwarf2_per_objfile->signatured_types,
26796 write_one_signatured_type, &sig_data);
26799 /* Now that we've processed all symbols we can shrink their cu_indices
26801 uniquify_cu_indices (&symtab);
26803 data_buf symtab_vec, constant_pool;
26804 write_hash_table (&symtab, symtab_vec, constant_pool);
26807 const offset_type size_of_contents = 6 * sizeof (offset_type);
26808 offset_type total_len = size_of_contents;
26810 /* The version number. */
26811 contents.append_data (MAYBE_SWAP (8));
26813 /* The offset of the CU list from the start of the file. */
26814 contents.append_data (MAYBE_SWAP (total_len));
26815 total_len += cu_list.size ();
26817 /* The offset of the types CU list from the start of the file. */
26818 contents.append_data (MAYBE_SWAP (total_len));
26819 total_len += types_cu_list.size ();
26821 /* The offset of the address table from the start of the file. */
26822 contents.append_data (MAYBE_SWAP (total_len));
26823 total_len += addr_vec.size ();
26825 /* The offset of the symbol table from the start of the file. */
26826 contents.append_data (MAYBE_SWAP (total_len));
26827 total_len += symtab_vec.size ();
26829 /* The offset of the constant pool from the start of the file. */
26830 contents.append_data (MAYBE_SWAP (total_len));
26831 total_len += constant_pool.size ();
26833 gdb_assert (contents.size () == size_of_contents);
26835 contents.file_write (out_file);
26836 cu_list.file_write (out_file);
26837 types_cu_list.file_write (out_file);
26838 addr_vec.file_write (out_file);
26839 symtab_vec.file_write (out_file);
26840 constant_pool.file_write (out_file);
26845 /* DWARF-5 augmentation string for GDB's DW_IDX_GNU_* extension. */
26846 static const gdb_byte dwarf5_gdb_augmentation[] = { 'G', 'D', 'B', 0 };
26848 /* Write a new .debug_names section for OBJFILE into OUT_FILE, write
26849 needed addition to .debug_str section to OUT_FILE_STR. Return how
26850 many bytes were expected to be written into OUT_FILE. */
26853 write_debug_names (struct dwarf2_per_objfile *dwarf2_per_objfile,
26854 FILE *out_file, FILE *out_file_str)
26856 const bool dwarf5_is_dwarf64 = check_dwarf64_offsets (dwarf2_per_objfile);
26857 struct objfile *objfile = dwarf2_per_objfile->objfile;
26858 const enum bfd_endian dwarf5_byte_order
26859 = gdbarch_byte_order (get_objfile_arch (objfile));
26861 /* The CU list is already sorted, so we don't need to do additional
26862 work here. Also, the debug_types entries do not appear in
26863 all_comp_units, but only in their own hash table. */
26865 debug_names nametable (dwarf2_per_objfile, dwarf5_is_dwarf64,
26866 dwarf5_byte_order);
26867 std::unordered_set<partial_symbol *>
26868 psyms_seen (psyms_seen_size (dwarf2_per_objfile));
26869 for (int i = 0; i < dwarf2_per_objfile->n_comp_units; ++i)
26871 const dwarf2_per_cu_data *per_cu = dwarf2_per_objfile->all_comp_units[i];
26872 partial_symtab *psymtab = per_cu->v.psymtab;
26874 /* CU of a shared file from 'dwz -m' may be unused by this main
26875 file. It may be referenced from a local scope but in such
26876 case it does not need to be present in .debug_names. */
26877 if (psymtab == NULL)
26880 if (psymtab->user == NULL)
26881 nametable.recursively_write_psymbols (objfile, psymtab, psyms_seen, i);
26883 cu_list.append_uint (nametable.dwarf5_offset_size (), dwarf5_byte_order,
26884 to_underlying (per_cu->sect_off));
26887 /* Write out the .debug_type entries, if any. */
26888 data_buf types_cu_list;
26889 if (dwarf2_per_objfile->signatured_types)
26891 debug_names::write_one_signatured_type_data sig_data (nametable,
26892 signatured_type_index_data (types_cu_list, psyms_seen));
26894 sig_data.info.objfile = objfile;
26895 /* It is used only for gdb_index. */
26896 sig_data.info.symtab = nullptr;
26897 sig_data.info.cu_index = 0;
26898 htab_traverse_noresize (dwarf2_per_objfile->signatured_types,
26899 debug_names::write_one_signatured_type,
26903 nametable.build ();
26905 /* No addr_vec - DWARF-5 uses .debug_aranges generated by GCC. */
26907 const offset_type bytes_of_header
26908 = ((dwarf5_is_dwarf64 ? 12 : 4)
26910 + sizeof (dwarf5_gdb_augmentation));
26911 size_t expected_bytes = 0;
26912 expected_bytes += bytes_of_header;
26913 expected_bytes += cu_list.size ();
26914 expected_bytes += types_cu_list.size ();
26915 expected_bytes += nametable.bytes ();
26918 if (!dwarf5_is_dwarf64)
26920 const uint64_t size64 = expected_bytes - 4;
26921 gdb_assert (size64 < 0xfffffff0);
26922 header.append_uint (4, dwarf5_byte_order, size64);
26926 header.append_uint (4, dwarf5_byte_order, 0xffffffff);
26927 header.append_uint (8, dwarf5_byte_order, expected_bytes - 12);
26930 /* The version number. */
26931 header.append_uint (2, dwarf5_byte_order, 5);
26934 header.append_uint (2, dwarf5_byte_order, 0);
26936 /* comp_unit_count - The number of CUs in the CU list. */
26937 header.append_uint (4, dwarf5_byte_order, dwarf2_per_objfile->n_comp_units);
26939 /* local_type_unit_count - The number of TUs in the local TU
26941 header.append_uint (4, dwarf5_byte_order, dwarf2_per_objfile->n_type_units);
26943 /* foreign_type_unit_count - The number of TUs in the foreign TU
26945 header.append_uint (4, dwarf5_byte_order, 0);
26947 /* bucket_count - The number of hash buckets in the hash lookup
26949 header.append_uint (4, dwarf5_byte_order, nametable.bucket_count ());
26951 /* name_count - The number of unique names in the index. */
26952 header.append_uint (4, dwarf5_byte_order, nametable.name_count ());
26954 /* abbrev_table_size - The size in bytes of the abbreviations
26956 header.append_uint (4, dwarf5_byte_order, nametable.abbrev_table_bytes ());
26958 /* augmentation_string_size - The size in bytes of the augmentation
26959 string. This value is rounded up to a multiple of 4. */
26960 static_assert (sizeof (dwarf5_gdb_augmentation) % 4 == 0, "");
26961 header.append_uint (4, dwarf5_byte_order, sizeof (dwarf5_gdb_augmentation));
26962 header.append_data (dwarf5_gdb_augmentation);
26964 gdb_assert (header.size () == bytes_of_header);
26966 header.file_write (out_file);
26967 cu_list.file_write (out_file);
26968 types_cu_list.file_write (out_file);
26969 nametable.file_write (out_file, out_file_str);
26971 return expected_bytes;
26974 /* Assert that FILE's size is EXPECTED_SIZE. Assumes file's seek
26975 position is at the end of the file. */
26978 assert_file_size (FILE *file, const char *filename, size_t expected_size)
26980 const auto file_size = ftell (file);
26981 if (file_size == -1)
26982 error (_("Can't get `%s' size"), filename);
26983 gdb_assert (file_size == expected_size);
26986 /* Create an index file for OBJFILE in the directory DIR. */
26989 write_psymtabs_to_index (struct dwarf2_per_objfile *dwarf2_per_objfile,
26991 dw_index_kind index_kind)
26993 struct objfile *objfile = dwarf2_per_objfile->objfile;
26995 if (dwarf2_per_objfile->using_index)
26996 error (_("Cannot use an index to create the index"));
26998 if (VEC_length (dwarf2_section_info_def, dwarf2_per_objfile->types) > 1)
26999 error (_("Cannot make an index when the file has multiple .debug_types sections"));
27001 if (!objfile->psymtabs || !objfile->psymtabs_addrmap)
27005 if (stat (objfile_name (objfile), &st) < 0)
27006 perror_with_name (objfile_name (objfile));
27008 std::string filename (std::string (dir) + SLASH_STRING
27009 + lbasename (objfile_name (objfile))
27010 + (index_kind == dw_index_kind::DEBUG_NAMES
27011 ? INDEX5_SUFFIX : INDEX4_SUFFIX));
27013 FILE *out_file = gdb_fopen_cloexec (filename.c_str (), "wb").release ();
27015 error (_("Can't open `%s' for writing"), filename.c_str ());
27017 /* Order matters here; we want FILE to be closed before FILENAME is
27018 unlinked, because on MS-Windows one cannot delete a file that is
27019 still open. (Don't call anything here that might throw until
27020 file_closer is created.) */
27021 gdb::unlinker unlink_file (filename.c_str ());
27022 gdb_file_up close_out_file (out_file);
27024 if (index_kind == dw_index_kind::DEBUG_NAMES)
27026 std::string filename_str (std::string (dir) + SLASH_STRING
27027 + lbasename (objfile_name (objfile))
27028 + DEBUG_STR_SUFFIX);
27030 = gdb_fopen_cloexec (filename_str.c_str (), "wb").release ();
27032 error (_("Can't open `%s' for writing"), filename_str.c_str ());
27033 gdb::unlinker unlink_file_str (filename_str.c_str ());
27034 gdb_file_up close_out_file_str (out_file_str);
27036 const size_t total_len
27037 = write_debug_names (dwarf2_per_objfile, out_file, out_file_str);
27038 assert_file_size (out_file, filename.c_str (), total_len);
27040 /* We want to keep the file .debug_str file too. */
27041 unlink_file_str.keep ();
27045 const size_t total_len
27046 = write_gdbindex (dwarf2_per_objfile, out_file);
27047 assert_file_size (out_file, filename.c_str (), total_len);
27050 /* We want to keep the file. */
27051 unlink_file.keep ();
27054 /* Implementation of the `save gdb-index' command.
27056 Note that the .gdb_index file format used by this command is
27057 documented in the GDB manual. Any changes here must be documented
27061 save_gdb_index_command (const char *arg, int from_tty)
27063 struct objfile *objfile;
27064 const char dwarf5space[] = "-dwarf-5 ";
27065 dw_index_kind index_kind = dw_index_kind::GDB_INDEX;
27070 arg = skip_spaces (arg);
27071 if (strncmp (arg, dwarf5space, strlen (dwarf5space)) == 0)
27073 index_kind = dw_index_kind::DEBUG_NAMES;
27074 arg += strlen (dwarf5space);
27075 arg = skip_spaces (arg);
27079 error (_("usage: save gdb-index [-dwarf-5] DIRECTORY"));
27081 ALL_OBJFILES (objfile)
27085 /* If the objfile does not correspond to an actual file, skip it. */
27086 if (stat (objfile_name (objfile), &st) < 0)
27089 struct dwarf2_per_objfile *dwarf2_per_objfile
27090 = get_dwarf2_per_objfile (objfile);
27092 if (dwarf2_per_objfile != NULL)
27096 write_psymtabs_to_index (dwarf2_per_objfile, arg, index_kind);
27098 CATCH (except, RETURN_MASK_ERROR)
27100 exception_fprintf (gdb_stderr, except,
27101 _("Error while writing index for `%s': "),
27102 objfile_name (objfile));
27112 int dwarf_always_disassemble;
27115 show_dwarf_always_disassemble (struct ui_file *file, int from_tty,
27116 struct cmd_list_element *c, const char *value)
27118 fprintf_filtered (file,
27119 _("Whether to always disassemble "
27120 "DWARF expressions is %s.\n"),
27125 show_check_physname (struct ui_file *file, int from_tty,
27126 struct cmd_list_element *c, const char *value)
27128 fprintf_filtered (file,
27129 _("Whether to check \"physname\" is %s.\n"),
27134 _initialize_dwarf2_read (void)
27136 struct cmd_list_element *c;
27138 dwarf2_objfile_data_key = register_objfile_data ();
27140 add_prefix_cmd ("dwarf", class_maintenance, set_dwarf_cmd, _("\
27141 Set DWARF specific variables.\n\
27142 Configure DWARF variables such as the cache size"),
27143 &set_dwarf_cmdlist, "maintenance set dwarf ",
27144 0/*allow-unknown*/, &maintenance_set_cmdlist);
27146 add_prefix_cmd ("dwarf", class_maintenance, show_dwarf_cmd, _("\
27147 Show DWARF specific variables\n\
27148 Show DWARF variables such as the cache size"),
27149 &show_dwarf_cmdlist, "maintenance show dwarf ",
27150 0/*allow-unknown*/, &maintenance_show_cmdlist);
27152 add_setshow_zinteger_cmd ("max-cache-age", class_obscure,
27153 &dwarf_max_cache_age, _("\
27154 Set the upper bound on the age of cached DWARF compilation units."), _("\
27155 Show the upper bound on the age of cached DWARF compilation units."), _("\
27156 A higher limit means that cached compilation units will be stored\n\
27157 in memory longer, and more total memory will be used. Zero disables\n\
27158 caching, which can slow down startup."),
27160 show_dwarf_max_cache_age,
27161 &set_dwarf_cmdlist,
27162 &show_dwarf_cmdlist);
27164 add_setshow_boolean_cmd ("always-disassemble", class_obscure,
27165 &dwarf_always_disassemble, _("\
27166 Set whether `info address' always disassembles DWARF expressions."), _("\
27167 Show whether `info address' always disassembles DWARF expressions."), _("\
27168 When enabled, DWARF expressions are always printed in an assembly-like\n\
27169 syntax. When disabled, expressions will be printed in a more\n\
27170 conversational style, when possible."),
27172 show_dwarf_always_disassemble,
27173 &set_dwarf_cmdlist,
27174 &show_dwarf_cmdlist);
27176 add_setshow_zuinteger_cmd ("dwarf-read", no_class, &dwarf_read_debug, _("\
27177 Set debugging of the DWARF reader."), _("\
27178 Show debugging of the DWARF reader."), _("\
27179 When enabled (non-zero), debugging messages are printed during DWARF\n\
27180 reading and symtab expansion. A value of 1 (one) provides basic\n\
27181 information. A value greater than 1 provides more verbose information."),
27184 &setdebuglist, &showdebuglist);
27186 add_setshow_zuinteger_cmd ("dwarf-die", no_class, &dwarf_die_debug, _("\
27187 Set debugging of the DWARF DIE reader."), _("\
27188 Show debugging of the DWARF DIE reader."), _("\
27189 When enabled (non-zero), DIEs are dumped after they are read in.\n\
27190 The value is the maximum depth to print."),
27193 &setdebuglist, &showdebuglist);
27195 add_setshow_zuinteger_cmd ("dwarf-line", no_class, &dwarf_line_debug, _("\
27196 Set debugging of the dwarf line reader."), _("\
27197 Show debugging of the dwarf line reader."), _("\
27198 When enabled (non-zero), line number entries are dumped as they are read in.\n\
27199 A value of 1 (one) provides basic information.\n\
27200 A value greater than 1 provides more verbose information."),
27203 &setdebuglist, &showdebuglist);
27205 add_setshow_boolean_cmd ("check-physname", no_class, &check_physname, _("\
27206 Set cross-checking of \"physname\" code against demangler."), _("\
27207 Show cross-checking of \"physname\" code against demangler."), _("\
27208 When enabled, GDB's internal \"physname\" code is checked against\n\
27210 NULL, show_check_physname,
27211 &setdebuglist, &showdebuglist);
27213 add_setshow_boolean_cmd ("use-deprecated-index-sections",
27214 no_class, &use_deprecated_index_sections, _("\
27215 Set whether to use deprecated gdb_index sections."), _("\
27216 Show whether to use deprecated gdb_index sections."), _("\
27217 When enabled, deprecated .gdb_index sections are used anyway.\n\
27218 Normally they are ignored either because of a missing feature or\n\
27219 performance issue.\n\
27220 Warning: This option must be enabled before gdb reads the file."),
27223 &setlist, &showlist);
27225 c = add_cmd ("gdb-index", class_files, save_gdb_index_command,
27227 Save a gdb-index file.\n\
27228 Usage: save gdb-index [-dwarf-5] DIRECTORY\n\
27230 No options create one file with .gdb-index extension for pre-DWARF-5\n\
27231 compatible .gdb_index section. With -dwarf-5 creates two files with\n\
27232 extension .debug_names and .debug_str for DWARF-5 .debug_names section."),
27234 set_cmd_completer (c, filename_completer);
27236 dwarf2_locexpr_index = register_symbol_computed_impl (LOC_COMPUTED,
27237 &dwarf2_locexpr_funcs);
27238 dwarf2_loclist_index = register_symbol_computed_impl (LOC_COMPUTED,
27239 &dwarf2_loclist_funcs);
27241 dwarf2_locexpr_block_index = register_symbol_block_impl (LOC_BLOCK,
27242 &dwarf2_block_frame_base_locexpr_funcs);
27243 dwarf2_loclist_block_index = register_symbol_block_impl (LOC_BLOCK,
27244 &dwarf2_block_frame_base_loclist_funcs);
27247 selftests::register_test ("dw2_expand_symtabs_matching",
27248 selftests::dw2_expand_symtabs_matching::run_test);