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 : public allocate_on_obstack
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 const 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. */
2529 = new (&objfile->objfile_obstack) struct dwarf2_per_objfile (objfile,
2531 set_dwarf2_per_objfile (objfile, dwarf2_per_objfile);
2533 return (!dwarf2_per_objfile->info.is_virtual
2534 && dwarf2_per_objfile->info.s.section != NULL
2535 && !dwarf2_per_objfile->abbrev.is_virtual
2536 && dwarf2_per_objfile->abbrev.s.section != NULL);
2539 /* Return the containing section of virtual section SECTION. */
2541 static struct dwarf2_section_info *
2542 get_containing_section (const struct dwarf2_section_info *section)
2544 gdb_assert (section->is_virtual);
2545 return section->s.containing_section;
2548 /* Return the bfd owner of SECTION. */
2551 get_section_bfd_owner (const struct dwarf2_section_info *section)
2553 if (section->is_virtual)
2555 section = get_containing_section (section);
2556 gdb_assert (!section->is_virtual);
2558 return section->s.section->owner;
2561 /* Return the bfd section of SECTION.
2562 Returns NULL if the section is not present. */
2565 get_section_bfd_section (const struct dwarf2_section_info *section)
2567 if (section->is_virtual)
2569 section = get_containing_section (section);
2570 gdb_assert (!section->is_virtual);
2572 return section->s.section;
2575 /* Return the name of SECTION. */
2578 get_section_name (const struct dwarf2_section_info *section)
2580 asection *sectp = get_section_bfd_section (section);
2582 gdb_assert (sectp != NULL);
2583 return bfd_section_name (get_section_bfd_owner (section), sectp);
2586 /* Return the name of the file SECTION is in. */
2589 get_section_file_name (const struct dwarf2_section_info *section)
2591 bfd *abfd = get_section_bfd_owner (section);
2593 return bfd_get_filename (abfd);
2596 /* Return the id of SECTION.
2597 Returns 0 if SECTION doesn't exist. */
2600 get_section_id (const struct dwarf2_section_info *section)
2602 asection *sectp = get_section_bfd_section (section);
2609 /* Return the flags of SECTION.
2610 SECTION (or containing section if this is a virtual section) must exist. */
2613 get_section_flags (const struct dwarf2_section_info *section)
2615 asection *sectp = get_section_bfd_section (section);
2617 gdb_assert (sectp != NULL);
2618 return bfd_get_section_flags (sectp->owner, sectp);
2621 /* When loading sections, we look either for uncompressed section or for
2622 compressed section names. */
2625 section_is_p (const char *section_name,
2626 const struct dwarf2_section_names *names)
2628 if (names->normal != NULL
2629 && strcmp (section_name, names->normal) == 0)
2631 if (names->compressed != NULL
2632 && strcmp (section_name, names->compressed) == 0)
2637 /* See declaration. */
2640 dwarf2_per_objfile::locate_sections (bfd *abfd, asection *sectp,
2641 const dwarf2_debug_sections &names)
2643 flagword aflag = bfd_get_section_flags (abfd, sectp);
2645 if ((aflag & SEC_HAS_CONTENTS) == 0)
2648 else if (section_is_p (sectp->name, &names.info))
2650 this->info.s.section = sectp;
2651 this->info.size = bfd_get_section_size (sectp);
2653 else if (section_is_p (sectp->name, &names.abbrev))
2655 this->abbrev.s.section = sectp;
2656 this->abbrev.size = bfd_get_section_size (sectp);
2658 else if (section_is_p (sectp->name, &names.line))
2660 this->line.s.section = sectp;
2661 this->line.size = bfd_get_section_size (sectp);
2663 else if (section_is_p (sectp->name, &names.loc))
2665 this->loc.s.section = sectp;
2666 this->loc.size = bfd_get_section_size (sectp);
2668 else if (section_is_p (sectp->name, &names.loclists))
2670 this->loclists.s.section = sectp;
2671 this->loclists.size = bfd_get_section_size (sectp);
2673 else if (section_is_p (sectp->name, &names.macinfo))
2675 this->macinfo.s.section = sectp;
2676 this->macinfo.size = bfd_get_section_size (sectp);
2678 else if (section_is_p (sectp->name, &names.macro))
2680 this->macro.s.section = sectp;
2681 this->macro.size = bfd_get_section_size (sectp);
2683 else if (section_is_p (sectp->name, &names.str))
2685 this->str.s.section = sectp;
2686 this->str.size = bfd_get_section_size (sectp);
2688 else if (section_is_p (sectp->name, &names.line_str))
2690 this->line_str.s.section = sectp;
2691 this->line_str.size = bfd_get_section_size (sectp);
2693 else if (section_is_p (sectp->name, &names.addr))
2695 this->addr.s.section = sectp;
2696 this->addr.size = bfd_get_section_size (sectp);
2698 else if (section_is_p (sectp->name, &names.frame))
2700 this->frame.s.section = sectp;
2701 this->frame.size = bfd_get_section_size (sectp);
2703 else if (section_is_p (sectp->name, &names.eh_frame))
2705 this->eh_frame.s.section = sectp;
2706 this->eh_frame.size = bfd_get_section_size (sectp);
2708 else if (section_is_p (sectp->name, &names.ranges))
2710 this->ranges.s.section = sectp;
2711 this->ranges.size = bfd_get_section_size (sectp);
2713 else if (section_is_p (sectp->name, &names.rnglists))
2715 this->rnglists.s.section = sectp;
2716 this->rnglists.size = bfd_get_section_size (sectp);
2718 else if (section_is_p (sectp->name, &names.types))
2720 struct dwarf2_section_info type_section;
2722 memset (&type_section, 0, sizeof (type_section));
2723 type_section.s.section = sectp;
2724 type_section.size = bfd_get_section_size (sectp);
2726 VEC_safe_push (dwarf2_section_info_def, this->types,
2729 else if (section_is_p (sectp->name, &names.gdb_index))
2731 this->gdb_index.s.section = sectp;
2732 this->gdb_index.size = bfd_get_section_size (sectp);
2734 else if (section_is_p (sectp->name, &names.debug_names))
2736 this->debug_names.s.section = sectp;
2737 this->debug_names.size = bfd_get_section_size (sectp);
2739 else if (section_is_p (sectp->name, &names.debug_aranges))
2741 this->debug_aranges.s.section = sectp;
2742 this->debug_aranges.size = bfd_get_section_size (sectp);
2745 if ((bfd_get_section_flags (abfd, sectp) & (SEC_LOAD | SEC_ALLOC))
2746 && bfd_section_vma (abfd, sectp) == 0)
2747 this->has_section_at_zero = true;
2750 /* A helper function that decides whether a section is empty,
2754 dwarf2_section_empty_p (const struct dwarf2_section_info *section)
2756 if (section->is_virtual)
2757 return section->size == 0;
2758 return section->s.section == NULL || section->size == 0;
2761 /* Read the contents of the section INFO.
2762 OBJFILE is the main object file, but not necessarily the file where
2763 the section comes from. E.g., for DWO files the bfd of INFO is the bfd
2765 If the section is compressed, uncompress it before returning. */
2768 dwarf2_read_section (struct objfile *objfile, struct dwarf2_section_info *info)
2772 gdb_byte *buf, *retbuf;
2776 info->buffer = NULL;
2779 if (dwarf2_section_empty_p (info))
2782 sectp = get_section_bfd_section (info);
2784 /* If this is a virtual section we need to read in the real one first. */
2785 if (info->is_virtual)
2787 struct dwarf2_section_info *containing_section =
2788 get_containing_section (info);
2790 gdb_assert (sectp != NULL);
2791 if ((sectp->flags & SEC_RELOC) != 0)
2793 error (_("Dwarf Error: DWP format V2 with relocations is not"
2794 " supported in section %s [in module %s]"),
2795 get_section_name (info), get_section_file_name (info));
2797 dwarf2_read_section (objfile, containing_section);
2798 /* Other code should have already caught virtual sections that don't
2800 gdb_assert (info->virtual_offset + info->size
2801 <= containing_section->size);
2802 /* If the real section is empty or there was a problem reading the
2803 section we shouldn't get here. */
2804 gdb_assert (containing_section->buffer != NULL);
2805 info->buffer = containing_section->buffer + info->virtual_offset;
2809 /* If the section has relocations, we must read it ourselves.
2810 Otherwise we attach it to the BFD. */
2811 if ((sectp->flags & SEC_RELOC) == 0)
2813 info->buffer = gdb_bfd_map_section (sectp, &info->size);
2817 buf = (gdb_byte *) obstack_alloc (&objfile->objfile_obstack, info->size);
2820 /* When debugging .o files, we may need to apply relocations; see
2821 http://sourceware.org/ml/gdb-patches/2002-04/msg00136.html .
2822 We never compress sections in .o files, so we only need to
2823 try this when the section is not compressed. */
2824 retbuf = symfile_relocate_debug_section (objfile, sectp, buf);
2827 info->buffer = retbuf;
2831 abfd = get_section_bfd_owner (info);
2832 gdb_assert (abfd != NULL);
2834 if (bfd_seek (abfd, sectp->filepos, SEEK_SET) != 0
2835 || bfd_bread (buf, info->size, abfd) != info->size)
2837 error (_("Dwarf Error: Can't read DWARF data"
2838 " in section %s [in module %s]"),
2839 bfd_section_name (abfd, sectp), bfd_get_filename (abfd));
2843 /* A helper function that returns the size of a section in a safe way.
2844 If you are positive that the section has been read before using the
2845 size, then it is safe to refer to the dwarf2_section_info object's
2846 "size" field directly. In other cases, you must call this
2847 function, because for compressed sections the size field is not set
2848 correctly until the section has been read. */
2850 static bfd_size_type
2851 dwarf2_section_size (struct objfile *objfile,
2852 struct dwarf2_section_info *info)
2855 dwarf2_read_section (objfile, info);
2859 /* Fill in SECTP, BUFP and SIZEP with section info, given OBJFILE and
2863 dwarf2_get_section_info (struct objfile *objfile,
2864 enum dwarf2_section_enum sect,
2865 asection **sectp, const gdb_byte **bufp,
2866 bfd_size_type *sizep)
2868 struct dwarf2_per_objfile *data
2869 = (struct dwarf2_per_objfile *) objfile_data (objfile,
2870 dwarf2_objfile_data_key);
2871 struct dwarf2_section_info *info;
2873 /* We may see an objfile without any DWARF, in which case we just
2884 case DWARF2_DEBUG_FRAME:
2885 info = &data->frame;
2887 case DWARF2_EH_FRAME:
2888 info = &data->eh_frame;
2891 gdb_assert_not_reached ("unexpected section");
2894 dwarf2_read_section (objfile, info);
2896 *sectp = get_section_bfd_section (info);
2897 *bufp = info->buffer;
2898 *sizep = info->size;
2901 /* A helper function to find the sections for a .dwz file. */
2904 locate_dwz_sections (bfd *abfd, asection *sectp, void *arg)
2906 struct dwz_file *dwz_file = (struct dwz_file *) arg;
2908 /* Note that we only support the standard ELF names, because .dwz
2909 is ELF-only (at the time of writing). */
2910 if (section_is_p (sectp->name, &dwarf2_elf_names.abbrev))
2912 dwz_file->abbrev.s.section = sectp;
2913 dwz_file->abbrev.size = bfd_get_section_size (sectp);
2915 else if (section_is_p (sectp->name, &dwarf2_elf_names.info))
2917 dwz_file->info.s.section = sectp;
2918 dwz_file->info.size = bfd_get_section_size (sectp);
2920 else if (section_is_p (sectp->name, &dwarf2_elf_names.str))
2922 dwz_file->str.s.section = sectp;
2923 dwz_file->str.size = bfd_get_section_size (sectp);
2925 else if (section_is_p (sectp->name, &dwarf2_elf_names.line))
2927 dwz_file->line.s.section = sectp;
2928 dwz_file->line.size = bfd_get_section_size (sectp);
2930 else if (section_is_p (sectp->name, &dwarf2_elf_names.macro))
2932 dwz_file->macro.s.section = sectp;
2933 dwz_file->macro.size = bfd_get_section_size (sectp);
2935 else if (section_is_p (sectp->name, &dwarf2_elf_names.gdb_index))
2937 dwz_file->gdb_index.s.section = sectp;
2938 dwz_file->gdb_index.size = bfd_get_section_size (sectp);
2940 else if (section_is_p (sectp->name, &dwarf2_elf_names.debug_names))
2942 dwz_file->debug_names.s.section = sectp;
2943 dwz_file->debug_names.size = bfd_get_section_size (sectp);
2947 /* Open the separate '.dwz' debug file, if needed. Return NULL if
2948 there is no .gnu_debugaltlink section in the file. Error if there
2949 is such a section but the file cannot be found. */
2951 static struct dwz_file *
2952 dwarf2_get_dwz_file (struct dwarf2_per_objfile *dwarf2_per_objfile)
2954 const char *filename;
2955 struct dwz_file *result;
2956 bfd_size_type buildid_len_arg;
2960 if (dwarf2_per_objfile->dwz_file != NULL)
2961 return dwarf2_per_objfile->dwz_file;
2963 bfd_set_error (bfd_error_no_error);
2964 gdb::unique_xmalloc_ptr<char> data
2965 (bfd_get_alt_debug_link_info (dwarf2_per_objfile->objfile->obfd,
2966 &buildid_len_arg, &buildid));
2969 if (bfd_get_error () == bfd_error_no_error)
2971 error (_("could not read '.gnu_debugaltlink' section: %s"),
2972 bfd_errmsg (bfd_get_error ()));
2975 gdb::unique_xmalloc_ptr<bfd_byte> buildid_holder (buildid);
2977 buildid_len = (size_t) buildid_len_arg;
2979 filename = data.get ();
2981 std::string abs_storage;
2982 if (!IS_ABSOLUTE_PATH (filename))
2984 gdb::unique_xmalloc_ptr<char> abs
2985 = gdb_realpath (objfile_name (dwarf2_per_objfile->objfile));
2987 abs_storage = ldirname (abs.get ()) + SLASH_STRING + filename;
2988 filename = abs_storage.c_str ();
2991 /* First try the file name given in the section. If that doesn't
2992 work, try to use the build-id instead. */
2993 gdb_bfd_ref_ptr dwz_bfd (gdb_bfd_open (filename, gnutarget, -1));
2994 if (dwz_bfd != NULL)
2996 if (!build_id_verify (dwz_bfd.get (), buildid_len, buildid))
3000 if (dwz_bfd == NULL)
3001 dwz_bfd = build_id_to_debug_bfd (buildid_len, buildid);
3003 if (dwz_bfd == NULL)
3004 error (_("could not find '.gnu_debugaltlink' file for %s"),
3005 objfile_name (dwarf2_per_objfile->objfile));
3007 result = OBSTACK_ZALLOC (&dwarf2_per_objfile->objfile->objfile_obstack,
3009 result->dwz_bfd = dwz_bfd.release ();
3011 bfd_map_over_sections (result->dwz_bfd, locate_dwz_sections, result);
3013 gdb_bfd_record_inclusion (dwarf2_per_objfile->objfile->obfd, result->dwz_bfd);
3014 dwarf2_per_objfile->dwz_file = result;
3018 /* DWARF quick_symbols_functions support. */
3020 /* TUs can share .debug_line entries, and there can be a lot more TUs than
3021 unique line tables, so we maintain a separate table of all .debug_line
3022 derived entries to support the sharing.
3023 All the quick functions need is the list of file names. We discard the
3024 line_header when we're done and don't need to record it here. */
3025 struct quick_file_names
3027 /* The data used to construct the hash key. */
3028 struct stmt_list_hash hash;
3030 /* The number of entries in file_names, real_names. */
3031 unsigned int num_file_names;
3033 /* The file names from the line table, after being run through
3035 const char **file_names;
3037 /* The file names from the line table after being run through
3038 gdb_realpath. These are computed lazily. */
3039 const char **real_names;
3042 /* When using the index (and thus not using psymtabs), each CU has an
3043 object of this type. This is used to hold information needed by
3044 the various "quick" methods. */
3045 struct dwarf2_per_cu_quick_data
3047 /* The file table. This can be NULL if there was no file table
3048 or it's currently not read in.
3049 NOTE: This points into dwarf2_per_objfile->quick_file_names_table. */
3050 struct quick_file_names *file_names;
3052 /* The corresponding symbol table. This is NULL if symbols for this
3053 CU have not yet been read. */
3054 struct compunit_symtab *compunit_symtab;
3056 /* A temporary mark bit used when iterating over all CUs in
3057 expand_symtabs_matching. */
3058 unsigned int mark : 1;
3060 /* True if we've tried to read the file table and found there isn't one.
3061 There will be no point in trying to read it again next time. */
3062 unsigned int no_file_data : 1;
3065 /* Utility hash function for a stmt_list_hash. */
3068 hash_stmt_list_entry (const struct stmt_list_hash *stmt_list_hash)
3072 if (stmt_list_hash->dwo_unit != NULL)
3073 v += (uintptr_t) stmt_list_hash->dwo_unit->dwo_file;
3074 v += to_underlying (stmt_list_hash->line_sect_off);
3078 /* Utility equality function for a stmt_list_hash. */
3081 eq_stmt_list_entry (const struct stmt_list_hash *lhs,
3082 const struct stmt_list_hash *rhs)
3084 if ((lhs->dwo_unit != NULL) != (rhs->dwo_unit != NULL))
3086 if (lhs->dwo_unit != NULL
3087 && lhs->dwo_unit->dwo_file != rhs->dwo_unit->dwo_file)
3090 return lhs->line_sect_off == rhs->line_sect_off;
3093 /* Hash function for a quick_file_names. */
3096 hash_file_name_entry (const void *e)
3098 const struct quick_file_names *file_data
3099 = (const struct quick_file_names *) e;
3101 return hash_stmt_list_entry (&file_data->hash);
3104 /* Equality function for a quick_file_names. */
3107 eq_file_name_entry (const void *a, const void *b)
3109 const struct quick_file_names *ea = (const struct quick_file_names *) a;
3110 const struct quick_file_names *eb = (const struct quick_file_names *) b;
3112 return eq_stmt_list_entry (&ea->hash, &eb->hash);
3115 /* Delete function for a quick_file_names. */
3118 delete_file_name_entry (void *e)
3120 struct quick_file_names *file_data = (struct quick_file_names *) e;
3123 for (i = 0; i < file_data->num_file_names; ++i)
3125 xfree ((void*) file_data->file_names[i]);
3126 if (file_data->real_names)
3127 xfree ((void*) file_data->real_names[i]);
3130 /* The space for the struct itself lives on objfile_obstack,
3131 so we don't free it here. */
3134 /* Create a quick_file_names hash table. */
3137 create_quick_file_names_table (unsigned int nr_initial_entries)
3139 return htab_create_alloc (nr_initial_entries,
3140 hash_file_name_entry, eq_file_name_entry,
3141 delete_file_name_entry, xcalloc, xfree);
3144 /* Read in PER_CU->CU. This function is unrelated to symtabs, symtab would
3145 have to be created afterwards. You should call age_cached_comp_units after
3146 processing PER_CU->CU. dw2_setup must have been already called. */
3149 load_cu (struct dwarf2_per_cu_data *per_cu)
3151 if (per_cu->is_debug_types)
3152 load_full_type_unit (per_cu);
3154 load_full_comp_unit (per_cu, language_minimal);
3156 if (per_cu->cu == NULL)
3157 return; /* Dummy CU. */
3159 dwarf2_find_base_address (per_cu->cu->dies, per_cu->cu);
3162 /* Read in the symbols for PER_CU. */
3165 dw2_do_instantiate_symtab (struct dwarf2_per_cu_data *per_cu)
3167 struct dwarf2_per_objfile *dwarf2_per_objfile = per_cu->dwarf2_per_objfile;
3169 /* Skip type_unit_groups, reading the type units they contain
3170 is handled elsewhere. */
3171 if (IS_TYPE_UNIT_GROUP (per_cu))
3174 /* The destructor of dwarf2_queue_guard frees any entries left on
3175 the queue. After this point we're guaranteed to leave this function
3176 with the dwarf queue empty. */
3177 dwarf2_queue_guard q_guard;
3179 if (dwarf2_per_objfile->using_index
3180 ? per_cu->v.quick->compunit_symtab == NULL
3181 : (per_cu->v.psymtab == NULL || !per_cu->v.psymtab->readin))
3183 queue_comp_unit (per_cu, language_minimal);
3186 /* If we just loaded a CU from a DWO, and we're working with an index
3187 that may badly handle TUs, load all the TUs in that DWO as well.
3188 http://sourceware.org/bugzilla/show_bug.cgi?id=15021 */
3189 if (!per_cu->is_debug_types
3190 && per_cu->cu != NULL
3191 && per_cu->cu->dwo_unit != NULL
3192 && dwarf2_per_objfile->index_table != NULL
3193 && dwarf2_per_objfile->index_table->version <= 7
3194 /* DWP files aren't supported yet. */
3195 && get_dwp_file (dwarf2_per_objfile) == NULL)
3196 queue_and_load_all_dwo_tus (per_cu);
3199 process_queue (dwarf2_per_objfile);
3201 /* Age the cache, releasing compilation units that have not
3202 been used recently. */
3203 age_cached_comp_units (dwarf2_per_objfile);
3206 /* Ensure that the symbols for PER_CU have been read in. OBJFILE is
3207 the objfile from which this CU came. Returns the resulting symbol
3210 static struct compunit_symtab *
3211 dw2_instantiate_symtab (struct dwarf2_per_cu_data *per_cu)
3213 struct dwarf2_per_objfile *dwarf2_per_objfile = per_cu->dwarf2_per_objfile;
3215 gdb_assert (dwarf2_per_objfile->using_index);
3216 if (!per_cu->v.quick->compunit_symtab)
3218 struct cleanup *back_to = make_cleanup (free_cached_comp_units,
3219 dwarf2_per_objfile);
3220 scoped_restore decrementer = increment_reading_symtab ();
3221 dw2_do_instantiate_symtab (per_cu);
3222 process_cu_includes (dwarf2_per_objfile);
3223 do_cleanups (back_to);
3226 return per_cu->v.quick->compunit_symtab;
3229 /* Return the CU/TU given its index.
3231 This is intended for loops like:
3233 for (i = 0; i < (dwarf2_per_objfile->n_comp_units
3234 + dwarf2_per_objfile->n_type_units); ++i)
3236 struct dwarf2_per_cu_data *per_cu = dw2_get_cutu (i);
3242 static struct dwarf2_per_cu_data *
3243 dw2_get_cutu (struct dwarf2_per_objfile *dwarf2_per_objfile,
3246 if (index >= dwarf2_per_objfile->n_comp_units)
3248 index -= dwarf2_per_objfile->n_comp_units;
3249 gdb_assert (index < dwarf2_per_objfile->n_type_units);
3250 return &dwarf2_per_objfile->all_type_units[index]->per_cu;
3253 return dwarf2_per_objfile->all_comp_units[index];
3256 /* Return the CU given its index.
3257 This differs from dw2_get_cutu in that it's for when you know INDEX
3260 static struct dwarf2_per_cu_data *
3261 dw2_get_cu (struct dwarf2_per_objfile *dwarf2_per_objfile, int index)
3263 gdb_assert (index >= 0 && index < dwarf2_per_objfile->n_comp_units);
3265 return dwarf2_per_objfile->all_comp_units[index];
3268 /* Return a new dwarf2_per_cu_data allocated on OBJFILE's
3269 objfile_obstack, and constructed with the specified field
3272 static dwarf2_per_cu_data *
3273 create_cu_from_index_list (struct dwarf2_per_objfile *dwarf2_per_objfile,
3274 struct dwarf2_section_info *section,
3276 sect_offset sect_off, ULONGEST length)
3278 struct objfile *objfile = dwarf2_per_objfile->objfile;
3279 dwarf2_per_cu_data *the_cu
3280 = OBSTACK_ZALLOC (&objfile->objfile_obstack,
3281 struct dwarf2_per_cu_data);
3282 the_cu->sect_off = sect_off;
3283 the_cu->length = length;
3284 the_cu->dwarf2_per_objfile = dwarf2_per_objfile;
3285 the_cu->section = section;
3286 the_cu->v.quick = OBSTACK_ZALLOC (&objfile->objfile_obstack,
3287 struct dwarf2_per_cu_quick_data);
3288 the_cu->is_dwz = is_dwz;
3292 /* A helper for create_cus_from_index that handles a given list of
3296 create_cus_from_index_list (struct objfile *objfile,
3297 const gdb_byte *cu_list, offset_type n_elements,
3298 struct dwarf2_section_info *section,
3303 struct dwarf2_per_objfile *dwarf2_per_objfile
3304 = get_dwarf2_per_objfile (objfile);
3306 for (i = 0; i < n_elements; i += 2)
3308 gdb_static_assert (sizeof (ULONGEST) >= 8);
3310 sect_offset sect_off
3311 = (sect_offset) extract_unsigned_integer (cu_list, 8, BFD_ENDIAN_LITTLE);
3312 ULONGEST length = extract_unsigned_integer (cu_list + 8, 8, BFD_ENDIAN_LITTLE);
3315 dwarf2_per_objfile->all_comp_units[base_offset + i / 2]
3316 = create_cu_from_index_list (dwarf2_per_objfile, section, is_dwz,
3321 /* Read the CU list from the mapped index, and use it to create all
3322 the CU objects for this objfile. */
3325 create_cus_from_index (struct objfile *objfile,
3326 const gdb_byte *cu_list, offset_type cu_list_elements,
3327 const gdb_byte *dwz_list, offset_type dwz_elements)
3329 struct dwz_file *dwz;
3330 struct dwarf2_per_objfile *dwarf2_per_objfile
3331 = get_dwarf2_per_objfile (objfile);
3333 dwarf2_per_objfile->n_comp_units = (cu_list_elements + dwz_elements) / 2;
3334 dwarf2_per_objfile->all_comp_units =
3335 XOBNEWVEC (&objfile->objfile_obstack, struct dwarf2_per_cu_data *,
3336 dwarf2_per_objfile->n_comp_units);
3338 create_cus_from_index_list (objfile, cu_list, cu_list_elements,
3339 &dwarf2_per_objfile->info, 0, 0);
3341 if (dwz_elements == 0)
3344 dwz = dwarf2_get_dwz_file (dwarf2_per_objfile);
3345 create_cus_from_index_list (objfile, dwz_list, dwz_elements, &dwz->info, 1,
3346 cu_list_elements / 2);
3349 /* Create the signatured type hash table from the index. */
3352 create_signatured_type_table_from_index (struct objfile *objfile,
3353 struct dwarf2_section_info *section,
3354 const gdb_byte *bytes,
3355 offset_type elements)
3358 htab_t sig_types_hash;
3359 struct dwarf2_per_objfile *dwarf2_per_objfile
3360 = get_dwarf2_per_objfile (objfile);
3362 dwarf2_per_objfile->n_type_units
3363 = dwarf2_per_objfile->n_allocated_type_units
3365 dwarf2_per_objfile->all_type_units =
3366 XNEWVEC (struct signatured_type *, dwarf2_per_objfile->n_type_units);
3368 sig_types_hash = allocate_signatured_type_table (objfile);
3370 for (i = 0; i < elements; i += 3)
3372 struct signatured_type *sig_type;
3375 cu_offset type_offset_in_tu;
3377 gdb_static_assert (sizeof (ULONGEST) >= 8);
3378 sect_offset sect_off
3379 = (sect_offset) extract_unsigned_integer (bytes, 8, BFD_ENDIAN_LITTLE);
3381 = (cu_offset) extract_unsigned_integer (bytes + 8, 8,
3383 signature = extract_unsigned_integer (bytes + 16, 8, BFD_ENDIAN_LITTLE);
3386 sig_type = OBSTACK_ZALLOC (&objfile->objfile_obstack,
3387 struct signatured_type);
3388 sig_type->signature = signature;
3389 sig_type->type_offset_in_tu = type_offset_in_tu;
3390 sig_type->per_cu.is_debug_types = 1;
3391 sig_type->per_cu.section = section;
3392 sig_type->per_cu.sect_off = sect_off;
3393 sig_type->per_cu.dwarf2_per_objfile = dwarf2_per_objfile;
3394 sig_type->per_cu.v.quick
3395 = OBSTACK_ZALLOC (&objfile->objfile_obstack,
3396 struct dwarf2_per_cu_quick_data);
3398 slot = htab_find_slot (sig_types_hash, sig_type, INSERT);
3401 dwarf2_per_objfile->all_type_units[i / 3] = sig_type;
3404 dwarf2_per_objfile->signatured_types = sig_types_hash;
3407 /* Create the signatured type hash table from .debug_names. */
3410 create_signatured_type_table_from_debug_names
3411 (struct dwarf2_per_objfile *dwarf2_per_objfile,
3412 const mapped_debug_names &map,
3413 struct dwarf2_section_info *section,
3414 struct dwarf2_section_info *abbrev_section)
3416 struct objfile *objfile = dwarf2_per_objfile->objfile;
3418 dwarf2_read_section (objfile, section);
3419 dwarf2_read_section (objfile, abbrev_section);
3421 dwarf2_per_objfile->n_type_units
3422 = dwarf2_per_objfile->n_allocated_type_units
3424 dwarf2_per_objfile->all_type_units
3425 = XNEWVEC (struct signatured_type *, dwarf2_per_objfile->n_type_units);
3427 htab_t sig_types_hash = allocate_signatured_type_table (objfile);
3429 for (uint32_t i = 0; i < map.tu_count; ++i)
3431 struct signatured_type *sig_type;
3434 cu_offset type_offset_in_tu;
3436 sect_offset sect_off
3437 = (sect_offset) (extract_unsigned_integer
3438 (map.tu_table_reordered + i * map.offset_size,
3440 map.dwarf5_byte_order));
3442 comp_unit_head cu_header;
3443 read_and_check_comp_unit_head (dwarf2_per_objfile, &cu_header, section,
3445 section->buffer + to_underlying (sect_off),
3448 sig_type = OBSTACK_ZALLOC (&objfile->objfile_obstack,
3449 struct signatured_type);
3450 sig_type->signature = cu_header.signature;
3451 sig_type->type_offset_in_tu = cu_header.type_cu_offset_in_tu;
3452 sig_type->per_cu.is_debug_types = 1;
3453 sig_type->per_cu.section = section;
3454 sig_type->per_cu.sect_off = sect_off;
3455 sig_type->per_cu.dwarf2_per_objfile = dwarf2_per_objfile;
3456 sig_type->per_cu.v.quick
3457 = OBSTACK_ZALLOC (&objfile->objfile_obstack,
3458 struct dwarf2_per_cu_quick_data);
3460 slot = htab_find_slot (sig_types_hash, sig_type, INSERT);
3463 dwarf2_per_objfile->all_type_units[i] = sig_type;
3466 dwarf2_per_objfile->signatured_types = sig_types_hash;
3469 /* Read the address map data from the mapped index, and use it to
3470 populate the objfile's psymtabs_addrmap. */
3473 create_addrmap_from_index (struct dwarf2_per_objfile *dwarf2_per_objfile,
3474 struct mapped_index *index)
3476 struct objfile *objfile = dwarf2_per_objfile->objfile;
3477 struct gdbarch *gdbarch = get_objfile_arch (objfile);
3478 const gdb_byte *iter, *end;
3479 struct addrmap *mutable_map;
3482 auto_obstack temp_obstack;
3484 mutable_map = addrmap_create_mutable (&temp_obstack);
3486 iter = index->address_table.data ();
3487 end = iter + index->address_table.size ();
3489 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
3493 ULONGEST hi, lo, cu_index;
3494 lo = extract_unsigned_integer (iter, 8, BFD_ENDIAN_LITTLE);
3496 hi = extract_unsigned_integer (iter, 8, BFD_ENDIAN_LITTLE);
3498 cu_index = extract_unsigned_integer (iter, 4, BFD_ENDIAN_LITTLE);
3503 complaint (&symfile_complaints,
3504 _(".gdb_index address table has invalid range (%s - %s)"),
3505 hex_string (lo), hex_string (hi));
3509 if (cu_index >= dwarf2_per_objfile->n_comp_units)
3511 complaint (&symfile_complaints,
3512 _(".gdb_index address table has invalid CU number %u"),
3513 (unsigned) cu_index);
3517 lo = gdbarch_adjust_dwarf2_addr (gdbarch, lo + baseaddr);
3518 hi = gdbarch_adjust_dwarf2_addr (gdbarch, hi + baseaddr);
3519 addrmap_set_empty (mutable_map, lo, hi - 1,
3520 dw2_get_cutu (dwarf2_per_objfile, cu_index));
3523 objfile->psymtabs_addrmap = addrmap_create_fixed (mutable_map,
3524 &objfile->objfile_obstack);
3527 /* Read the address map data from DWARF-5 .debug_aranges, and use it to
3528 populate the objfile's psymtabs_addrmap. */
3531 create_addrmap_from_aranges (struct dwarf2_per_objfile *dwarf2_per_objfile,
3532 struct dwarf2_section_info *section)
3534 struct objfile *objfile = dwarf2_per_objfile->objfile;
3535 bfd *abfd = objfile->obfd;
3536 struct gdbarch *gdbarch = get_objfile_arch (objfile);
3537 const CORE_ADDR baseaddr = ANOFFSET (objfile->section_offsets,
3538 SECT_OFF_TEXT (objfile));
3540 auto_obstack temp_obstack;
3541 addrmap *mutable_map = addrmap_create_mutable (&temp_obstack);
3543 std::unordered_map<sect_offset,
3544 dwarf2_per_cu_data *,
3545 gdb::hash_enum<sect_offset>>
3546 debug_info_offset_to_per_cu;
3547 for (int cui = 0; cui < dwarf2_per_objfile->n_comp_units; ++cui)
3549 dwarf2_per_cu_data *per_cu = dw2_get_cutu (dwarf2_per_objfile, cui);
3550 const auto insertpair
3551 = debug_info_offset_to_per_cu.emplace (per_cu->sect_off, per_cu);
3552 if (!insertpair.second)
3554 warning (_("Section .debug_aranges in %s has duplicate "
3555 "debug_info_offset %s, ignoring .debug_aranges."),
3556 objfile_name (objfile), sect_offset_str (per_cu->sect_off));
3561 dwarf2_read_section (objfile, section);
3563 const bfd_endian dwarf5_byte_order = gdbarch_byte_order (gdbarch);
3565 const gdb_byte *addr = section->buffer;
3567 while (addr < section->buffer + section->size)
3569 const gdb_byte *const entry_addr = addr;
3570 unsigned int bytes_read;
3572 const LONGEST entry_length = read_initial_length (abfd, addr,
3576 const gdb_byte *const entry_end = addr + entry_length;
3577 const bool dwarf5_is_dwarf64 = bytes_read != 4;
3578 const uint8_t offset_size = dwarf5_is_dwarf64 ? 8 : 4;
3579 if (addr + entry_length > section->buffer + section->size)
3581 warning (_("Section .debug_aranges in %s entry at offset %zu "
3582 "length %s exceeds section length %s, "
3583 "ignoring .debug_aranges."),
3584 objfile_name (objfile), entry_addr - section->buffer,
3585 plongest (bytes_read + entry_length),
3586 pulongest (section->size));
3590 /* The version number. */
3591 const uint16_t version = read_2_bytes (abfd, addr);
3595 warning (_("Section .debug_aranges in %s entry at offset %zu "
3596 "has unsupported version %d, ignoring .debug_aranges."),
3597 objfile_name (objfile), entry_addr - section->buffer,
3602 const uint64_t debug_info_offset
3603 = extract_unsigned_integer (addr, offset_size, dwarf5_byte_order);
3604 addr += offset_size;
3605 const auto per_cu_it
3606 = debug_info_offset_to_per_cu.find (sect_offset (debug_info_offset));
3607 if (per_cu_it == debug_info_offset_to_per_cu.cend ())
3609 warning (_("Section .debug_aranges in %s entry at offset %zu "
3610 "debug_info_offset %s does not exists, "
3611 "ignoring .debug_aranges."),
3612 objfile_name (objfile), entry_addr - section->buffer,
3613 pulongest (debug_info_offset));
3616 dwarf2_per_cu_data *const per_cu = per_cu_it->second;
3618 const uint8_t address_size = *addr++;
3619 if (address_size < 1 || address_size > 8)
3621 warning (_("Section .debug_aranges in %s entry at offset %zu "
3622 "address_size %u is invalid, ignoring .debug_aranges."),
3623 objfile_name (objfile), entry_addr - section->buffer,
3628 const uint8_t segment_selector_size = *addr++;
3629 if (segment_selector_size != 0)
3631 warning (_("Section .debug_aranges in %s entry at offset %zu "
3632 "segment_selector_size %u is not supported, "
3633 "ignoring .debug_aranges."),
3634 objfile_name (objfile), entry_addr - section->buffer,
3635 segment_selector_size);
3639 /* Must pad to an alignment boundary that is twice the address
3640 size. It is undocumented by the DWARF standard but GCC does
3642 for (size_t padding = ((-(addr - section->buffer))
3643 & (2 * address_size - 1));
3644 padding > 0; padding--)
3647 warning (_("Section .debug_aranges in %s entry at offset %zu "
3648 "padding is not zero, ignoring .debug_aranges."),
3649 objfile_name (objfile), entry_addr - section->buffer);
3655 if (addr + 2 * address_size > entry_end)
3657 warning (_("Section .debug_aranges in %s entry at offset %zu "
3658 "address list is not properly terminated, "
3659 "ignoring .debug_aranges."),
3660 objfile_name (objfile), entry_addr - section->buffer);
3663 ULONGEST start = extract_unsigned_integer (addr, address_size,
3665 addr += address_size;
3666 ULONGEST length = extract_unsigned_integer (addr, address_size,
3668 addr += address_size;
3669 if (start == 0 && length == 0)
3671 if (start == 0 && !dwarf2_per_objfile->has_section_at_zero)
3673 /* Symbol was eliminated due to a COMDAT group. */
3676 ULONGEST end = start + length;
3677 start = gdbarch_adjust_dwarf2_addr (gdbarch, start + baseaddr);
3678 end = gdbarch_adjust_dwarf2_addr (gdbarch, end + baseaddr);
3679 addrmap_set_empty (mutable_map, start, end - 1, per_cu);
3683 objfile->psymtabs_addrmap = addrmap_create_fixed (mutable_map,
3684 &objfile->objfile_obstack);
3687 /* The hash function for strings in the mapped index. This is the same as
3688 SYMBOL_HASH_NEXT, but we keep a separate copy to maintain control over the
3689 implementation. This is necessary because the hash function is tied to the
3690 format of the mapped index file. The hash values do not have to match with
3693 Use INT_MAX for INDEX_VERSION if you generate the current index format. */
3696 mapped_index_string_hash (int index_version, const void *p)
3698 const unsigned char *str = (const unsigned char *) p;
3702 while ((c = *str++) != 0)
3704 if (index_version >= 5)
3706 r = r * 67 + c - 113;
3712 /* Find a slot in the mapped index INDEX for the object named NAME.
3713 If NAME is found, set *VEC_OUT to point to the CU vector in the
3714 constant pool and return true. If NAME cannot be found, return
3718 find_slot_in_mapped_hash (struct mapped_index *index, const char *name,
3719 offset_type **vec_out)
3722 offset_type slot, step;
3723 int (*cmp) (const char *, const char *);
3725 gdb::unique_xmalloc_ptr<char> without_params;
3726 if (current_language->la_language == language_cplus
3727 || current_language->la_language == language_fortran
3728 || current_language->la_language == language_d)
3730 /* NAME is already canonical. Drop any qualifiers as .gdb_index does
3733 if (strchr (name, '(') != NULL)
3735 without_params = cp_remove_params (name);
3737 if (without_params != NULL)
3738 name = without_params.get ();
3742 /* Index version 4 did not support case insensitive searches. But the
3743 indices for case insensitive languages are built in lowercase, therefore
3744 simulate our NAME being searched is also lowercased. */
3745 hash = mapped_index_string_hash ((index->version == 4
3746 && case_sensitivity == case_sensitive_off
3747 ? 5 : index->version),
3750 slot = hash & (index->symbol_table.size () - 1);
3751 step = ((hash * 17) & (index->symbol_table.size () - 1)) | 1;
3752 cmp = (case_sensitivity == case_sensitive_on ? strcmp : strcasecmp);
3758 const auto &bucket = index->symbol_table[slot];
3759 if (bucket.name == 0 && bucket.vec == 0)
3762 str = index->constant_pool + MAYBE_SWAP (bucket.name);
3763 if (!cmp (name, str))
3765 *vec_out = (offset_type *) (index->constant_pool
3766 + MAYBE_SWAP (bucket.vec));
3770 slot = (slot + step) & (index->symbol_table.size () - 1);
3774 /* A helper function that reads the .gdb_index from SECTION and fills
3775 in MAP. FILENAME is the name of the file containing the section;
3776 it is used for error reporting. DEPRECATED_OK is nonzero if it is
3777 ok to use deprecated sections.
3779 CU_LIST, CU_LIST_ELEMENTS, TYPES_LIST, and TYPES_LIST_ELEMENTS are
3780 out parameters that are filled in with information about the CU and
3781 TU lists in the section.
3783 Returns 1 if all went well, 0 otherwise. */
3786 read_index_from_section (struct objfile *objfile,
3787 const char *filename,
3789 struct dwarf2_section_info *section,
3790 struct mapped_index *map,
3791 const gdb_byte **cu_list,
3792 offset_type *cu_list_elements,
3793 const gdb_byte **types_list,
3794 offset_type *types_list_elements)
3796 const gdb_byte *addr;
3797 offset_type version;
3798 offset_type *metadata;
3801 if (dwarf2_section_empty_p (section))
3804 /* Older elfutils strip versions could keep the section in the main
3805 executable while splitting it for the separate debug info file. */
3806 if ((get_section_flags (section) & SEC_HAS_CONTENTS) == 0)
3809 dwarf2_read_section (objfile, section);
3811 addr = section->buffer;
3812 /* Version check. */
3813 version = MAYBE_SWAP (*(offset_type *) addr);
3814 /* Versions earlier than 3 emitted every copy of a psymbol. This
3815 causes the index to behave very poorly for certain requests. Version 3
3816 contained incomplete addrmap. So, it seems better to just ignore such
3820 static int warning_printed = 0;
3821 if (!warning_printed)
3823 warning (_("Skipping obsolete .gdb_index section in %s."),
3825 warning_printed = 1;
3829 /* Index version 4 uses a different hash function than index version
3832 Versions earlier than 6 did not emit psymbols for inlined
3833 functions. Using these files will cause GDB not to be able to
3834 set breakpoints on inlined functions by name, so we ignore these
3835 indices unless the user has done
3836 "set use-deprecated-index-sections on". */
3837 if (version < 6 && !deprecated_ok)
3839 static int warning_printed = 0;
3840 if (!warning_printed)
3843 Skipping deprecated .gdb_index section in %s.\n\
3844 Do \"set use-deprecated-index-sections on\" before the file is read\n\
3845 to use the section anyway."),
3847 warning_printed = 1;
3851 /* Version 7 indices generated by gold refer to the CU for a symbol instead
3852 of the TU (for symbols coming from TUs),
3853 http://sourceware.org/bugzilla/show_bug.cgi?id=15021.
3854 Plus gold-generated indices can have duplicate entries for global symbols,
3855 http://sourceware.org/bugzilla/show_bug.cgi?id=15646.
3856 These are just performance bugs, and we can't distinguish gdb-generated
3857 indices from gold-generated ones, so issue no warning here. */
3859 /* Indexes with higher version than the one supported by GDB may be no
3860 longer backward compatible. */
3864 map->version = version;
3865 map->total_size = section->size;
3867 metadata = (offset_type *) (addr + sizeof (offset_type));
3870 *cu_list = addr + MAYBE_SWAP (metadata[i]);
3871 *cu_list_elements = ((MAYBE_SWAP (metadata[i + 1]) - MAYBE_SWAP (metadata[i]))
3875 *types_list = addr + MAYBE_SWAP (metadata[i]);
3876 *types_list_elements = ((MAYBE_SWAP (metadata[i + 1])
3877 - MAYBE_SWAP (metadata[i]))
3881 const gdb_byte *address_table = addr + MAYBE_SWAP (metadata[i]);
3882 const gdb_byte *address_table_end = addr + MAYBE_SWAP (metadata[i + 1]);
3884 = gdb::array_view<const gdb_byte> (address_table, address_table_end);
3887 const gdb_byte *symbol_table = addr + MAYBE_SWAP (metadata[i]);
3888 const gdb_byte *symbol_table_end = addr + MAYBE_SWAP (metadata[i + 1]);
3890 = gdb::array_view<mapped_index::symbol_table_slot>
3891 ((mapped_index::symbol_table_slot *) symbol_table,
3892 (mapped_index::symbol_table_slot *) symbol_table_end);
3895 map->constant_pool = (char *) (addr + MAYBE_SWAP (metadata[i]));
3900 /* Read .gdb_index. If everything went ok, initialize the "quick"
3901 elements of all the CUs and return 1. Otherwise, return 0. */
3904 dwarf2_read_index (struct objfile *objfile)
3906 struct mapped_index local_map, *map;
3907 const gdb_byte *cu_list, *types_list, *dwz_list = NULL;
3908 offset_type cu_list_elements, types_list_elements, dwz_list_elements = 0;
3909 struct dwz_file *dwz;
3910 struct dwarf2_per_objfile *dwarf2_per_objfile
3911 = get_dwarf2_per_objfile (objfile);
3913 if (!read_index_from_section (objfile, objfile_name (objfile),
3914 use_deprecated_index_sections,
3915 &dwarf2_per_objfile->gdb_index, &local_map,
3916 &cu_list, &cu_list_elements,
3917 &types_list, &types_list_elements))
3920 /* Don't use the index if it's empty. */
3921 if (local_map.symbol_table.empty ())
3924 /* If there is a .dwz file, read it so we can get its CU list as
3926 dwz = dwarf2_get_dwz_file (dwarf2_per_objfile);
3929 struct mapped_index dwz_map;
3930 const gdb_byte *dwz_types_ignore;
3931 offset_type dwz_types_elements_ignore;
3933 if (!read_index_from_section (objfile, bfd_get_filename (dwz->dwz_bfd),
3935 &dwz->gdb_index, &dwz_map,
3936 &dwz_list, &dwz_list_elements,
3938 &dwz_types_elements_ignore))
3940 warning (_("could not read '.gdb_index' section from %s; skipping"),
3941 bfd_get_filename (dwz->dwz_bfd));
3946 create_cus_from_index (objfile, cu_list, cu_list_elements, dwz_list,
3949 if (types_list_elements)
3951 struct dwarf2_section_info *section;
3953 /* We can only handle a single .debug_types when we have an
3955 if (VEC_length (dwarf2_section_info_def, dwarf2_per_objfile->types) != 1)
3958 section = VEC_index (dwarf2_section_info_def,
3959 dwarf2_per_objfile->types, 0);
3961 create_signatured_type_table_from_index (objfile, section, types_list,
3962 types_list_elements);
3965 create_addrmap_from_index (dwarf2_per_objfile, &local_map);
3967 map = XOBNEW (&objfile->objfile_obstack, struct mapped_index);
3968 map = new (map) mapped_index ();
3971 dwarf2_per_objfile->index_table = map;
3972 dwarf2_per_objfile->using_index = 1;
3973 dwarf2_per_objfile->quick_file_names_table =
3974 create_quick_file_names_table (dwarf2_per_objfile->n_comp_units);
3979 /* die_reader_func for dw2_get_file_names. */
3982 dw2_get_file_names_reader (const struct die_reader_specs *reader,
3983 const gdb_byte *info_ptr,
3984 struct die_info *comp_unit_die,
3988 struct dwarf2_cu *cu = reader->cu;
3989 struct dwarf2_per_cu_data *this_cu = cu->per_cu;
3990 struct dwarf2_per_objfile *dwarf2_per_objfile
3991 = cu->per_cu->dwarf2_per_objfile;
3992 struct objfile *objfile = dwarf2_per_objfile->objfile;
3993 struct dwarf2_per_cu_data *lh_cu;
3994 struct attribute *attr;
3997 struct quick_file_names *qfn;
3999 gdb_assert (! this_cu->is_debug_types);
4001 /* Our callers never want to match partial units -- instead they
4002 will match the enclosing full CU. */
4003 if (comp_unit_die->tag == DW_TAG_partial_unit)
4005 this_cu->v.quick->no_file_data = 1;
4013 sect_offset line_offset {};
4015 attr = dwarf2_attr (comp_unit_die, DW_AT_stmt_list, cu);
4018 struct quick_file_names find_entry;
4020 line_offset = (sect_offset) DW_UNSND (attr);
4022 /* We may have already read in this line header (TU line header sharing).
4023 If we have we're done. */
4024 find_entry.hash.dwo_unit = cu->dwo_unit;
4025 find_entry.hash.line_sect_off = line_offset;
4026 slot = htab_find_slot (dwarf2_per_objfile->quick_file_names_table,
4027 &find_entry, INSERT);
4030 lh_cu->v.quick->file_names = (struct quick_file_names *) *slot;
4034 lh = dwarf_decode_line_header (line_offset, cu);
4038 lh_cu->v.quick->no_file_data = 1;
4042 qfn = XOBNEW (&objfile->objfile_obstack, struct quick_file_names);
4043 qfn->hash.dwo_unit = cu->dwo_unit;
4044 qfn->hash.line_sect_off = line_offset;
4045 gdb_assert (slot != NULL);
4048 file_and_directory fnd = find_file_and_directory (comp_unit_die, cu);
4050 qfn->num_file_names = lh->file_names.size ();
4052 XOBNEWVEC (&objfile->objfile_obstack, const char *, lh->file_names.size ());
4053 for (i = 0; i < lh->file_names.size (); ++i)
4054 qfn->file_names[i] = file_full_name (i + 1, lh.get (), fnd.comp_dir);
4055 qfn->real_names = NULL;
4057 lh_cu->v.quick->file_names = qfn;
4060 /* A helper for the "quick" functions which attempts to read the line
4061 table for THIS_CU. */
4063 static struct quick_file_names *
4064 dw2_get_file_names (struct dwarf2_per_cu_data *this_cu)
4066 /* This should never be called for TUs. */
4067 gdb_assert (! this_cu->is_debug_types);
4068 /* Nor type unit groups. */
4069 gdb_assert (! IS_TYPE_UNIT_GROUP (this_cu));
4071 if (this_cu->v.quick->file_names != NULL)
4072 return this_cu->v.quick->file_names;
4073 /* If we know there is no line data, no point in looking again. */
4074 if (this_cu->v.quick->no_file_data)
4077 init_cutu_and_read_dies_simple (this_cu, dw2_get_file_names_reader, NULL);
4079 if (this_cu->v.quick->no_file_data)
4081 return this_cu->v.quick->file_names;
4084 /* A helper for the "quick" functions which computes and caches the
4085 real path for a given file name from the line table. */
4088 dw2_get_real_path (struct objfile *objfile,
4089 struct quick_file_names *qfn, int index)
4091 if (qfn->real_names == NULL)
4092 qfn->real_names = OBSTACK_CALLOC (&objfile->objfile_obstack,
4093 qfn->num_file_names, const char *);
4095 if (qfn->real_names[index] == NULL)
4096 qfn->real_names[index] = gdb_realpath (qfn->file_names[index]).release ();
4098 return qfn->real_names[index];
4101 static struct symtab *
4102 dw2_find_last_source_symtab (struct objfile *objfile)
4104 struct dwarf2_per_objfile *dwarf2_per_objfile
4105 = get_dwarf2_per_objfile (objfile);
4106 int index = dwarf2_per_objfile->n_comp_units - 1;
4107 dwarf2_per_cu_data *dwarf_cu = dw2_get_cutu (dwarf2_per_objfile, index);
4108 compunit_symtab *cust = dw2_instantiate_symtab (dwarf_cu);
4113 return compunit_primary_filetab (cust);
4116 /* Traversal function for dw2_forget_cached_source_info. */
4119 dw2_free_cached_file_names (void **slot, void *info)
4121 struct quick_file_names *file_data = (struct quick_file_names *) *slot;
4123 if (file_data->real_names)
4127 for (i = 0; i < file_data->num_file_names; ++i)
4129 xfree ((void*) file_data->real_names[i]);
4130 file_data->real_names[i] = NULL;
4138 dw2_forget_cached_source_info (struct objfile *objfile)
4140 struct dwarf2_per_objfile *dwarf2_per_objfile
4141 = get_dwarf2_per_objfile (objfile);
4143 htab_traverse_noresize (dwarf2_per_objfile->quick_file_names_table,
4144 dw2_free_cached_file_names, NULL);
4147 /* Helper function for dw2_map_symtabs_matching_filename that expands
4148 the symtabs and calls the iterator. */
4151 dw2_map_expand_apply (struct objfile *objfile,
4152 struct dwarf2_per_cu_data *per_cu,
4153 const char *name, const char *real_path,
4154 gdb::function_view<bool (symtab *)> callback)
4156 struct compunit_symtab *last_made = objfile->compunit_symtabs;
4158 /* Don't visit already-expanded CUs. */
4159 if (per_cu->v.quick->compunit_symtab)
4162 /* This may expand more than one symtab, and we want to iterate over
4164 dw2_instantiate_symtab (per_cu);
4166 return iterate_over_some_symtabs (name, real_path, objfile->compunit_symtabs,
4167 last_made, callback);
4170 /* Implementation of the map_symtabs_matching_filename method. */
4173 dw2_map_symtabs_matching_filename
4174 (struct objfile *objfile, const char *name, const char *real_path,
4175 gdb::function_view<bool (symtab *)> callback)
4178 const char *name_basename = lbasename (name);
4179 struct dwarf2_per_objfile *dwarf2_per_objfile
4180 = get_dwarf2_per_objfile (objfile);
4182 /* The rule is CUs specify all the files, including those used by
4183 any TU, so there's no need to scan TUs here. */
4185 for (int i = 0; i < dwarf2_per_objfile->n_comp_units; ++i)
4188 struct dwarf2_per_cu_data *per_cu = dw2_get_cu (dwarf2_per_objfile, i);
4189 struct quick_file_names *file_data;
4191 /* We only need to look at symtabs not already expanded. */
4192 if (per_cu->v.quick->compunit_symtab)
4195 file_data = dw2_get_file_names (per_cu);
4196 if (file_data == NULL)
4199 for (j = 0; j < file_data->num_file_names; ++j)
4201 const char *this_name = file_data->file_names[j];
4202 const char *this_real_name;
4204 if (compare_filenames_for_search (this_name, name))
4206 if (dw2_map_expand_apply (objfile, per_cu, name, real_path,
4212 /* Before we invoke realpath, which can get expensive when many
4213 files are involved, do a quick comparison of the basenames. */
4214 if (! basenames_may_differ
4215 && FILENAME_CMP (lbasename (this_name), name_basename) != 0)
4218 this_real_name = dw2_get_real_path (objfile, file_data, j);
4219 if (compare_filenames_for_search (this_real_name, name))
4221 if (dw2_map_expand_apply (objfile, per_cu, name, real_path,
4227 if (real_path != NULL)
4229 gdb_assert (IS_ABSOLUTE_PATH (real_path));
4230 gdb_assert (IS_ABSOLUTE_PATH (name));
4231 if (this_real_name != NULL
4232 && FILENAME_CMP (real_path, this_real_name) == 0)
4234 if (dw2_map_expand_apply (objfile, per_cu, name, real_path,
4246 /* Struct used to manage iterating over all CUs looking for a symbol. */
4248 struct dw2_symtab_iterator
4250 /* The dwarf2_per_objfile owning the CUs we are iterating on. */
4251 struct dwarf2_per_objfile *dwarf2_per_objfile;
4252 /* If non-zero, only look for symbols that match BLOCK_INDEX. */
4253 int want_specific_block;
4254 /* One of GLOBAL_BLOCK or STATIC_BLOCK.
4255 Unused if !WANT_SPECIFIC_BLOCK. */
4257 /* The kind of symbol we're looking for. */
4259 /* The list of CUs from the index entry of the symbol,
4260 or NULL if not found. */
4262 /* The next element in VEC to look at. */
4264 /* The number of elements in VEC, or zero if there is no match. */
4266 /* Have we seen a global version of the symbol?
4267 If so we can ignore all further global instances.
4268 This is to work around gold/15646, inefficient gold-generated
4273 /* Initialize the index symtab iterator ITER.
4274 If WANT_SPECIFIC_BLOCK is non-zero, only look for symbols
4275 in block BLOCK_INDEX. Otherwise BLOCK_INDEX is ignored. */
4278 dw2_symtab_iter_init (struct dw2_symtab_iterator *iter,
4279 struct dwarf2_per_objfile *dwarf2_per_objfile,
4280 int want_specific_block,
4285 iter->dwarf2_per_objfile = dwarf2_per_objfile;
4286 iter->want_specific_block = want_specific_block;
4287 iter->block_index = block_index;
4288 iter->domain = domain;
4290 iter->global_seen = 0;
4292 mapped_index *index = dwarf2_per_objfile->index_table;
4294 /* index is NULL if OBJF_READNOW. */
4295 if (index != NULL && find_slot_in_mapped_hash (index, name, &iter->vec))
4296 iter->length = MAYBE_SWAP (*iter->vec);
4304 /* Return the next matching CU or NULL if there are no more. */
4306 static struct dwarf2_per_cu_data *
4307 dw2_symtab_iter_next (struct dw2_symtab_iterator *iter)
4309 struct dwarf2_per_objfile *dwarf2_per_objfile = iter->dwarf2_per_objfile;
4311 for ( ; iter->next < iter->length; ++iter->next)
4313 offset_type cu_index_and_attrs =
4314 MAYBE_SWAP (iter->vec[iter->next + 1]);
4315 offset_type cu_index = GDB_INDEX_CU_VALUE (cu_index_and_attrs);
4316 struct dwarf2_per_cu_data *per_cu;
4317 int want_static = iter->block_index != GLOBAL_BLOCK;
4318 /* This value is only valid for index versions >= 7. */
4319 int is_static = GDB_INDEX_SYMBOL_STATIC_VALUE (cu_index_and_attrs);
4320 gdb_index_symbol_kind symbol_kind =
4321 GDB_INDEX_SYMBOL_KIND_VALUE (cu_index_and_attrs);
4322 /* Only check the symbol attributes if they're present.
4323 Indices prior to version 7 don't record them,
4324 and indices >= 7 may elide them for certain symbols
4325 (gold does this). */
4327 (dwarf2_per_objfile->index_table->version >= 7
4328 && symbol_kind != GDB_INDEX_SYMBOL_KIND_NONE);
4330 /* Don't crash on bad data. */
4331 if (cu_index >= (dwarf2_per_objfile->n_comp_units
4332 + dwarf2_per_objfile->n_type_units))
4334 complaint (&symfile_complaints,
4335 _(".gdb_index entry has bad CU index"
4337 objfile_name (dwarf2_per_objfile->objfile));
4341 per_cu = dw2_get_cutu (dwarf2_per_objfile, cu_index);
4343 /* Skip if already read in. */
4344 if (per_cu->v.quick->compunit_symtab)
4347 /* Check static vs global. */
4350 if (iter->want_specific_block
4351 && want_static != is_static)
4353 /* Work around gold/15646. */
4354 if (!is_static && iter->global_seen)
4357 iter->global_seen = 1;
4360 /* Only check the symbol's kind if it has one. */
4363 switch (iter->domain)
4366 if (symbol_kind != GDB_INDEX_SYMBOL_KIND_VARIABLE
4367 && symbol_kind != GDB_INDEX_SYMBOL_KIND_FUNCTION
4368 /* Some types are also in VAR_DOMAIN. */
4369 && symbol_kind != GDB_INDEX_SYMBOL_KIND_TYPE)
4373 if (symbol_kind != GDB_INDEX_SYMBOL_KIND_TYPE)
4377 if (symbol_kind != GDB_INDEX_SYMBOL_KIND_OTHER)
4392 static struct compunit_symtab *
4393 dw2_lookup_symbol (struct objfile *objfile, int block_index,
4394 const char *name, domain_enum domain)
4396 struct compunit_symtab *stab_best = NULL;
4397 struct dwarf2_per_objfile *dwarf2_per_objfile
4398 = get_dwarf2_per_objfile (objfile);
4400 lookup_name_info lookup_name (name, symbol_name_match_type::FULL);
4402 struct dw2_symtab_iterator iter;
4403 struct dwarf2_per_cu_data *per_cu;
4405 dw2_symtab_iter_init (&iter, dwarf2_per_objfile, 1, block_index, domain, name);
4407 while ((per_cu = dw2_symtab_iter_next (&iter)) != NULL)
4409 struct symbol *sym, *with_opaque = NULL;
4410 struct compunit_symtab *stab = dw2_instantiate_symtab (per_cu);
4411 const struct blockvector *bv = COMPUNIT_BLOCKVECTOR (stab);
4412 struct block *block = BLOCKVECTOR_BLOCK (bv, block_index);
4414 sym = block_find_symbol (block, name, domain,
4415 block_find_non_opaque_type_preferred,
4418 /* Some caution must be observed with overloaded functions
4419 and methods, since the index will not contain any overload
4420 information (but NAME might contain it). */
4423 && SYMBOL_MATCHES_SEARCH_NAME (sym, lookup_name))
4425 if (with_opaque != NULL
4426 && SYMBOL_MATCHES_SEARCH_NAME (with_opaque, lookup_name))
4429 /* Keep looking through other CUs. */
4436 dw2_print_stats (struct objfile *objfile)
4438 struct dwarf2_per_objfile *dwarf2_per_objfile
4439 = get_dwarf2_per_objfile (objfile);
4440 int total = dwarf2_per_objfile->n_comp_units + dwarf2_per_objfile->n_type_units;
4443 for (int i = 0; i < total; ++i)
4445 struct dwarf2_per_cu_data *per_cu = dw2_get_cutu (dwarf2_per_objfile, i);
4447 if (!per_cu->v.quick->compunit_symtab)
4450 printf_filtered (_(" Number of read CUs: %d\n"), total - count);
4451 printf_filtered (_(" Number of unread CUs: %d\n"), count);
4454 /* This dumps minimal information about the index.
4455 It is called via "mt print objfiles".
4456 One use is to verify .gdb_index has been loaded by the
4457 gdb.dwarf2/gdb-index.exp testcase. */
4460 dw2_dump (struct objfile *objfile)
4462 struct dwarf2_per_objfile *dwarf2_per_objfile
4463 = get_dwarf2_per_objfile (objfile);
4465 gdb_assert (dwarf2_per_objfile->using_index);
4466 printf_filtered (".gdb_index:");
4467 if (dwarf2_per_objfile->index_table != NULL)
4469 printf_filtered (" version %d\n",
4470 dwarf2_per_objfile->index_table->version);
4473 printf_filtered (" faked for \"readnow\"\n");
4474 printf_filtered ("\n");
4478 dw2_relocate (struct objfile *objfile,
4479 const struct section_offsets *new_offsets,
4480 const struct section_offsets *delta)
4482 /* There's nothing to relocate here. */
4486 dw2_expand_symtabs_for_function (struct objfile *objfile,
4487 const char *func_name)
4489 struct dwarf2_per_objfile *dwarf2_per_objfile
4490 = get_dwarf2_per_objfile (objfile);
4492 struct dw2_symtab_iterator iter;
4493 struct dwarf2_per_cu_data *per_cu;
4495 /* Note: It doesn't matter what we pass for block_index here. */
4496 dw2_symtab_iter_init (&iter, dwarf2_per_objfile, 0, GLOBAL_BLOCK, VAR_DOMAIN,
4499 while ((per_cu = dw2_symtab_iter_next (&iter)) != NULL)
4500 dw2_instantiate_symtab (per_cu);
4505 dw2_expand_all_symtabs (struct objfile *objfile)
4507 struct dwarf2_per_objfile *dwarf2_per_objfile
4508 = get_dwarf2_per_objfile (objfile);
4509 int total_units = (dwarf2_per_objfile->n_comp_units
4510 + dwarf2_per_objfile->n_type_units);
4512 for (int i = 0; i < total_units; ++i)
4514 struct dwarf2_per_cu_data *per_cu
4515 = dw2_get_cutu (dwarf2_per_objfile, i);
4517 dw2_instantiate_symtab (per_cu);
4522 dw2_expand_symtabs_with_fullname (struct objfile *objfile,
4523 const char *fullname)
4525 struct dwarf2_per_objfile *dwarf2_per_objfile
4526 = get_dwarf2_per_objfile (objfile);
4528 /* We don't need to consider type units here.
4529 This is only called for examining code, e.g. expand_line_sal.
4530 There can be an order of magnitude (or more) more type units
4531 than comp units, and we avoid them if we can. */
4533 for (int i = 0; i < dwarf2_per_objfile->n_comp_units; ++i)
4536 struct dwarf2_per_cu_data *per_cu = dw2_get_cutu (dwarf2_per_objfile, i);
4537 struct quick_file_names *file_data;
4539 /* We only need to look at symtabs not already expanded. */
4540 if (per_cu->v.quick->compunit_symtab)
4543 file_data = dw2_get_file_names (per_cu);
4544 if (file_data == NULL)
4547 for (j = 0; j < file_data->num_file_names; ++j)
4549 const char *this_fullname = file_data->file_names[j];
4551 if (filename_cmp (this_fullname, fullname) == 0)
4553 dw2_instantiate_symtab (per_cu);
4561 dw2_map_matching_symbols (struct objfile *objfile,
4562 const char * name, domain_enum domain,
4564 int (*callback) (struct block *,
4565 struct symbol *, void *),
4566 void *data, symbol_name_match_type match,
4567 symbol_compare_ftype *ordered_compare)
4569 /* Currently unimplemented; used for Ada. The function can be called if the
4570 current language is Ada for a non-Ada objfile using GNU index. As Ada
4571 does not look for non-Ada symbols this function should just return. */
4574 /* Symbol name matcher for .gdb_index names.
4576 Symbol names in .gdb_index have a few particularities:
4578 - There's no indication of which is the language of each symbol.
4580 Since each language has its own symbol name matching algorithm,
4581 and we don't know which language is the right one, we must match
4582 each symbol against all languages. This would be a potential
4583 performance problem if it were not mitigated by the
4584 mapped_index::name_components lookup table, which significantly
4585 reduces the number of times we need to call into this matcher,
4586 making it a non-issue.
4588 - Symbol names in the index have no overload (parameter)
4589 information. I.e., in C++, "foo(int)" and "foo(long)" both
4590 appear as "foo" in the index, for example.
4592 This means that the lookup names passed to the symbol name
4593 matcher functions must have no parameter information either
4594 because (e.g.) symbol search name "foo" does not match
4595 lookup-name "foo(int)" [while swapping search name for lookup
4598 class gdb_index_symbol_name_matcher
4601 /* Prepares the vector of comparison functions for LOOKUP_NAME. */
4602 gdb_index_symbol_name_matcher (const lookup_name_info &lookup_name);
4604 /* Walk all the matcher routines and match SYMBOL_NAME against them.
4605 Returns true if any matcher matches. */
4606 bool matches (const char *symbol_name);
4609 /* A reference to the lookup name we're matching against. */
4610 const lookup_name_info &m_lookup_name;
4612 /* A vector holding all the different symbol name matchers, for all
4614 std::vector<symbol_name_matcher_ftype *> m_symbol_name_matcher_funcs;
4617 gdb_index_symbol_name_matcher::gdb_index_symbol_name_matcher
4618 (const lookup_name_info &lookup_name)
4619 : m_lookup_name (lookup_name)
4621 /* Prepare the vector of comparison functions upfront, to avoid
4622 doing the same work for each symbol. Care is taken to avoid
4623 matching with the same matcher more than once if/when multiple
4624 languages use the same matcher function. */
4625 auto &matchers = m_symbol_name_matcher_funcs;
4626 matchers.reserve (nr_languages);
4628 matchers.push_back (default_symbol_name_matcher);
4630 for (int i = 0; i < nr_languages; i++)
4632 const language_defn *lang = language_def ((enum language) i);
4633 symbol_name_matcher_ftype *name_matcher
4634 = get_symbol_name_matcher (lang, m_lookup_name);
4636 /* Don't insert the same comparison routine more than once.
4637 Note that we do this linear walk instead of a seemingly
4638 cheaper sorted insert, or use a std::set or something like
4639 that, because relative order of function addresses is not
4640 stable. This is not a problem in practice because the number
4641 of supported languages is low, and the cost here is tiny
4642 compared to the number of searches we'll do afterwards using
4644 if (name_matcher != default_symbol_name_matcher
4645 && (std::find (matchers.begin (), matchers.end (), name_matcher)
4646 == matchers.end ()))
4647 matchers.push_back (name_matcher);
4652 gdb_index_symbol_name_matcher::matches (const char *symbol_name)
4654 for (auto matches_name : m_symbol_name_matcher_funcs)
4655 if (matches_name (symbol_name, m_lookup_name, NULL))
4661 /* Starting from a search name, return the string that finds the upper
4662 bound of all strings that start with SEARCH_NAME in a sorted name
4663 list. Returns the empty string to indicate that the upper bound is
4664 the end of the list. */
4667 make_sort_after_prefix_name (const char *search_name)
4669 /* When looking to complete "func", we find the upper bound of all
4670 symbols that start with "func" by looking for where we'd insert
4671 the closest string that would follow "func" in lexicographical
4672 order. Usually, that's "func"-with-last-character-incremented,
4673 i.e. "fund". Mind non-ASCII characters, though. Usually those
4674 will be UTF-8 multi-byte sequences, but we can't be certain.
4675 Especially mind the 0xff character, which is a valid character in
4676 non-UTF-8 source character sets (e.g. Latin1 'ÿ'), and we can't
4677 rule out compilers allowing it in identifiers. Note that
4678 conveniently, strcmp/strcasecmp are specified to compare
4679 characters interpreted as unsigned char. So what we do is treat
4680 the whole string as a base 256 number composed of a sequence of
4681 base 256 "digits" and add 1 to it. I.e., adding 1 to 0xff wraps
4682 to 0, and carries 1 to the following more-significant position.
4683 If the very first character in SEARCH_NAME ends up incremented
4684 and carries/overflows, then the upper bound is the end of the
4685 list. The string after the empty string is also the empty
4688 Some examples of this operation:
4690 SEARCH_NAME => "+1" RESULT
4694 "\xff" "a" "\xff" => "\xff" "b"
4699 Then, with these symbols for example:
4705 completing "func" looks for symbols between "func" and
4706 "func"-with-last-character-incremented, i.e. "fund" (exclusive),
4707 which finds "func" and "func1", but not "fund".
4711 funcÿ (Latin1 'ÿ' [0xff])
4715 completing "funcÿ" looks for symbols between "funcÿ" and "fund"
4716 (exclusive), which finds "funcÿ" and "funcÿ1", but not "fund".
4720 ÿÿ (Latin1 'ÿ' [0xff])
4723 completing "ÿ" or "ÿÿ" looks for symbols between between "ÿÿ" and
4724 the end of the list.
4726 std::string after = search_name;
4727 while (!after.empty () && (unsigned char) after.back () == 0xff)
4729 if (!after.empty ())
4730 after.back () = (unsigned char) after.back () + 1;
4734 /* See declaration. */
4736 std::pair<std::vector<name_component>::const_iterator,
4737 std::vector<name_component>::const_iterator>
4738 mapped_index_base::find_name_components_bounds
4739 (const lookup_name_info &lookup_name_without_params) const
4742 = this->name_components_casing == case_sensitive_on ? strcmp : strcasecmp;
4745 = lookup_name_without_params.cplus ().lookup_name ().c_str ();
4747 /* Comparison function object for lower_bound that matches against a
4748 given symbol name. */
4749 auto lookup_compare_lower = [&] (const name_component &elem,
4752 const char *elem_qualified = this->symbol_name_at (elem.idx);
4753 const char *elem_name = elem_qualified + elem.name_offset;
4754 return name_cmp (elem_name, name) < 0;
4757 /* Comparison function object for upper_bound that matches against a
4758 given symbol name. */
4759 auto lookup_compare_upper = [&] (const char *name,
4760 const name_component &elem)
4762 const char *elem_qualified = this->symbol_name_at (elem.idx);
4763 const char *elem_name = elem_qualified + elem.name_offset;
4764 return name_cmp (name, elem_name) < 0;
4767 auto begin = this->name_components.begin ();
4768 auto end = this->name_components.end ();
4770 /* Find the lower bound. */
4773 if (lookup_name_without_params.completion_mode () && cplus[0] == '\0')
4776 return std::lower_bound (begin, end, cplus, lookup_compare_lower);
4779 /* Find the upper bound. */
4782 if (lookup_name_without_params.completion_mode ())
4784 /* In completion mode, we want UPPER to point past all
4785 symbols names that have the same prefix. I.e., with
4786 these symbols, and completing "func":
4788 function << lower bound
4790 other_function << upper bound
4792 We find the upper bound by looking for the insertion
4793 point of "func"-with-last-character-incremented,
4795 std::string after = make_sort_after_prefix_name (cplus);
4798 return std::lower_bound (lower, end, after.c_str (),
4799 lookup_compare_lower);
4802 return std::upper_bound (lower, end, cplus, lookup_compare_upper);
4805 return {lower, upper};
4808 /* See declaration. */
4811 mapped_index_base::build_name_components ()
4813 if (!this->name_components.empty ())
4816 this->name_components_casing = case_sensitivity;
4818 = this->name_components_casing == case_sensitive_on ? strcmp : strcasecmp;
4820 /* The code below only knows how to break apart components of C++
4821 symbol names (and other languages that use '::' as
4822 namespace/module separator). If we add support for wild matching
4823 to some language that uses some other operator (E.g., Ada, Go and
4824 D use '.'), then we'll need to try splitting the symbol name
4825 according to that language too. Note that Ada does support wild
4826 matching, but doesn't currently support .gdb_index. */
4827 auto count = this->symbol_name_count ();
4828 for (offset_type idx = 0; idx < count; idx++)
4830 if (this->symbol_name_slot_invalid (idx))
4833 const char *name = this->symbol_name_at (idx);
4835 /* Add each name component to the name component table. */
4836 unsigned int previous_len = 0;
4837 for (unsigned int current_len = cp_find_first_component (name);
4838 name[current_len] != '\0';
4839 current_len += cp_find_first_component (name + current_len))
4841 gdb_assert (name[current_len] == ':');
4842 this->name_components.push_back ({previous_len, idx});
4843 /* Skip the '::'. */
4845 previous_len = current_len;
4847 this->name_components.push_back ({previous_len, idx});
4850 /* Sort name_components elements by name. */
4851 auto name_comp_compare = [&] (const name_component &left,
4852 const name_component &right)
4854 const char *left_qualified = this->symbol_name_at (left.idx);
4855 const char *right_qualified = this->symbol_name_at (right.idx);
4857 const char *left_name = left_qualified + left.name_offset;
4858 const char *right_name = right_qualified + right.name_offset;
4860 return name_cmp (left_name, right_name) < 0;
4863 std::sort (this->name_components.begin (),
4864 this->name_components.end (),
4868 /* Helper for dw2_expand_symtabs_matching that works with a
4869 mapped_index_base instead of the containing objfile. This is split
4870 to a separate function in order to be able to unit test the
4871 name_components matching using a mock mapped_index_base. For each
4872 symbol name that matches, calls MATCH_CALLBACK, passing it the
4873 symbol's index in the mapped_index_base symbol table. */
4876 dw2_expand_symtabs_matching_symbol
4877 (mapped_index_base &index,
4878 const lookup_name_info &lookup_name_in,
4879 gdb::function_view<expand_symtabs_symbol_matcher_ftype> symbol_matcher,
4880 enum search_domain kind,
4881 gdb::function_view<void (offset_type)> match_callback)
4883 lookup_name_info lookup_name_without_params
4884 = lookup_name_in.make_ignore_params ();
4885 gdb_index_symbol_name_matcher lookup_name_matcher
4886 (lookup_name_without_params);
4888 /* Build the symbol name component sorted vector, if we haven't
4890 index.build_name_components ();
4892 auto bounds = index.find_name_components_bounds (lookup_name_without_params);
4894 /* Now for each symbol name in range, check to see if we have a name
4895 match, and if so, call the MATCH_CALLBACK callback. */
4897 /* The same symbol may appear more than once in the range though.
4898 E.g., if we're looking for symbols that complete "w", and we have
4899 a symbol named "w1::w2", we'll find the two name components for
4900 that same symbol in the range. To be sure we only call the
4901 callback once per symbol, we first collect the symbol name
4902 indexes that matched in a temporary vector and ignore
4904 std::vector<offset_type> matches;
4905 matches.reserve (std::distance (bounds.first, bounds.second));
4907 for (; bounds.first != bounds.second; ++bounds.first)
4909 const char *qualified = index.symbol_name_at (bounds.first->idx);
4911 if (!lookup_name_matcher.matches (qualified)
4912 || (symbol_matcher != NULL && !symbol_matcher (qualified)))
4915 matches.push_back (bounds.first->idx);
4918 std::sort (matches.begin (), matches.end ());
4920 /* Finally call the callback, once per match. */
4922 for (offset_type idx : matches)
4926 match_callback (idx);
4931 /* Above we use a type wider than idx's for 'prev', since 0 and
4932 (offset_type)-1 are both possible values. */
4933 static_assert (sizeof (prev) > sizeof (offset_type), "");
4938 namespace selftests { namespace dw2_expand_symtabs_matching {
4940 /* A mock .gdb_index/.debug_names-like name index table, enough to
4941 exercise dw2_expand_symtabs_matching_symbol, which works with the
4942 mapped_index_base interface. Builds an index from the symbol list
4943 passed as parameter to the constructor. */
4944 class mock_mapped_index : public mapped_index_base
4947 mock_mapped_index (gdb::array_view<const char *> symbols)
4948 : m_symbol_table (symbols)
4951 DISABLE_COPY_AND_ASSIGN (mock_mapped_index);
4953 /* Return the number of names in the symbol table. */
4954 virtual size_t symbol_name_count () const
4956 return m_symbol_table.size ();
4959 /* Get the name of the symbol at IDX in the symbol table. */
4960 virtual const char *symbol_name_at (offset_type idx) const
4962 return m_symbol_table[idx];
4966 gdb::array_view<const char *> m_symbol_table;
4969 /* Convenience function that converts a NULL pointer to a "<null>"
4970 string, to pass to print routines. */
4973 string_or_null (const char *str)
4975 return str != NULL ? str : "<null>";
4978 /* Check if a lookup_name_info built from
4979 NAME/MATCH_TYPE/COMPLETION_MODE matches the symbols in the mock
4980 index. EXPECTED_LIST is the list of expected matches, in expected
4981 matching order. If no match expected, then an empty list is
4982 specified. Returns true on success. On failure prints a warning
4983 indicating the file:line that failed, and returns false. */
4986 check_match (const char *file, int line,
4987 mock_mapped_index &mock_index,
4988 const char *name, symbol_name_match_type match_type,
4989 bool completion_mode,
4990 std::initializer_list<const char *> expected_list)
4992 lookup_name_info lookup_name (name, match_type, completion_mode);
4994 bool matched = true;
4996 auto mismatch = [&] (const char *expected_str,
4999 warning (_("%s:%d: match_type=%s, looking-for=\"%s\", "
5000 "expected=\"%s\", got=\"%s\"\n"),
5002 (match_type == symbol_name_match_type::FULL
5004 name, string_or_null (expected_str), string_or_null (got));
5008 auto expected_it = expected_list.begin ();
5009 auto expected_end = expected_list.end ();
5011 dw2_expand_symtabs_matching_symbol (mock_index, lookup_name,
5013 [&] (offset_type idx)
5015 const char *matched_name = mock_index.symbol_name_at (idx);
5016 const char *expected_str
5017 = expected_it == expected_end ? NULL : *expected_it++;
5019 if (expected_str == NULL || strcmp (expected_str, matched_name) != 0)
5020 mismatch (expected_str, matched_name);
5023 const char *expected_str
5024 = expected_it == expected_end ? NULL : *expected_it++;
5025 if (expected_str != NULL)
5026 mismatch (expected_str, NULL);
5031 /* The symbols added to the mock mapped_index for testing (in
5033 static const char *test_symbols[] = {
5042 "ns2::tmpl<int>::foo2",
5043 "(anonymous namespace)::A::B::C",
5045 /* These are used to check that the increment-last-char in the
5046 matching algorithm for completion doesn't match "t1_fund" when
5047 completing "t1_func". */
5053 /* A UTF-8 name with multi-byte sequences to make sure that
5054 cp-name-parser understands this as a single identifier ("função"
5055 is "function" in PT). */
5058 /* \377 (0xff) is Latin1 'ÿ'. */
5061 /* \377 (0xff) is Latin1 'ÿ'. */
5065 /* A name with all sorts of complications. Starts with "z" to make
5066 it easier for the completion tests below. */
5067 #define Z_SYM_NAME \
5068 "z::std::tuple<(anonymous namespace)::ui*, std::bar<(anonymous namespace)::ui> >" \
5069 "::tuple<(anonymous namespace)::ui*, " \
5070 "std::default_delete<(anonymous namespace)::ui>, void>"
5075 /* Returns true if the mapped_index_base::find_name_component_bounds
5076 method finds EXPECTED_SYMS in INDEX when looking for SEARCH_NAME,
5077 in completion mode. */
5080 check_find_bounds_finds (mapped_index_base &index,
5081 const char *search_name,
5082 gdb::array_view<const char *> expected_syms)
5084 lookup_name_info lookup_name (search_name,
5085 symbol_name_match_type::FULL, true);
5087 auto bounds = index.find_name_components_bounds (lookup_name);
5089 size_t distance = std::distance (bounds.first, bounds.second);
5090 if (distance != expected_syms.size ())
5093 for (size_t exp_elem = 0; exp_elem < distance; exp_elem++)
5095 auto nc_elem = bounds.first + exp_elem;
5096 const char *qualified = index.symbol_name_at (nc_elem->idx);
5097 if (strcmp (qualified, expected_syms[exp_elem]) != 0)
5104 /* Test the lower-level mapped_index::find_name_component_bounds
5108 test_mapped_index_find_name_component_bounds ()
5110 mock_mapped_index mock_index (test_symbols);
5112 mock_index.build_name_components ();
5114 /* Test the lower-level mapped_index::find_name_component_bounds
5115 method in completion mode. */
5117 static const char *expected_syms[] = {
5122 SELF_CHECK (check_find_bounds_finds (mock_index,
5123 "t1_func", expected_syms));
5126 /* Check that the increment-last-char in the name matching algorithm
5127 for completion doesn't get confused with Ansi1 'ÿ' / 0xff. */
5129 static const char *expected_syms1[] = {
5133 SELF_CHECK (check_find_bounds_finds (mock_index,
5134 "\377", expected_syms1));
5136 static const char *expected_syms2[] = {
5139 SELF_CHECK (check_find_bounds_finds (mock_index,
5140 "\377\377", expected_syms2));
5144 /* Test dw2_expand_symtabs_matching_symbol. */
5147 test_dw2_expand_symtabs_matching_symbol ()
5149 mock_mapped_index mock_index (test_symbols);
5151 /* We let all tests run until the end even if some fails, for debug
5153 bool any_mismatch = false;
5155 /* Create the expected symbols list (an initializer_list). Needed
5156 because lists have commas, and we need to pass them to CHECK,
5157 which is a macro. */
5158 #define EXPECT(...) { __VA_ARGS__ }
5160 /* Wrapper for check_match that passes down the current
5161 __FILE__/__LINE__. */
5162 #define CHECK_MATCH(NAME, MATCH_TYPE, COMPLETION_MODE, EXPECTED_LIST) \
5163 any_mismatch |= !check_match (__FILE__, __LINE__, \
5165 NAME, MATCH_TYPE, COMPLETION_MODE, \
5168 /* Identity checks. */
5169 for (const char *sym : test_symbols)
5171 /* Should be able to match all existing symbols. */
5172 CHECK_MATCH (sym, symbol_name_match_type::FULL, false,
5175 /* Should be able to match all existing symbols with
5177 std::string with_params = std::string (sym) + "(int)";
5178 CHECK_MATCH (with_params.c_str (), symbol_name_match_type::FULL, false,
5181 /* Should be able to match all existing symbols with
5182 parameters and qualifiers. */
5183 with_params = std::string (sym) + " ( int ) const";
5184 CHECK_MATCH (with_params.c_str (), symbol_name_match_type::FULL, false,
5187 /* This should really find sym, but cp-name-parser.y doesn't
5188 know about lvalue/rvalue qualifiers yet. */
5189 with_params = std::string (sym) + " ( int ) &&";
5190 CHECK_MATCH (with_params.c_str (), symbol_name_match_type::FULL, false,
5194 /* Check that the name matching algorithm for completion doesn't get
5195 confused with Latin1 'ÿ' / 0xff. */
5197 static const char str[] = "\377";
5198 CHECK_MATCH (str, symbol_name_match_type::FULL, true,
5199 EXPECT ("\377", "\377\377123"));
5202 /* Check that the increment-last-char in the matching algorithm for
5203 completion doesn't match "t1_fund" when completing "t1_func". */
5205 static const char str[] = "t1_func";
5206 CHECK_MATCH (str, symbol_name_match_type::FULL, true,
5207 EXPECT ("t1_func", "t1_func1"));
5210 /* Check that completion mode works at each prefix of the expected
5213 static const char str[] = "function(int)";
5214 size_t len = strlen (str);
5217 for (size_t i = 1; i < len; i++)
5219 lookup.assign (str, i);
5220 CHECK_MATCH (lookup.c_str (), symbol_name_match_type::FULL, true,
5221 EXPECT ("function"));
5225 /* While "w" is a prefix of both components, the match function
5226 should still only be called once. */
5228 CHECK_MATCH ("w", symbol_name_match_type::FULL, true,
5230 CHECK_MATCH ("w", symbol_name_match_type::WILD, true,
5234 /* Same, with a "complicated" symbol. */
5236 static const char str[] = Z_SYM_NAME;
5237 size_t len = strlen (str);
5240 for (size_t i = 1; i < len; i++)
5242 lookup.assign (str, i);
5243 CHECK_MATCH (lookup.c_str (), symbol_name_match_type::FULL, true,
5244 EXPECT (Z_SYM_NAME));
5248 /* In FULL mode, an incomplete symbol doesn't match. */
5250 CHECK_MATCH ("std::zfunction(int", symbol_name_match_type::FULL, false,
5254 /* A complete symbol with parameters matches any overload, since the
5255 index has no overload info. */
5257 CHECK_MATCH ("std::zfunction(int)", symbol_name_match_type::FULL, true,
5258 EXPECT ("std::zfunction", "std::zfunction2"));
5259 CHECK_MATCH ("zfunction(int)", symbol_name_match_type::WILD, true,
5260 EXPECT ("std::zfunction", "std::zfunction2"));
5261 CHECK_MATCH ("zfunc", symbol_name_match_type::WILD, true,
5262 EXPECT ("std::zfunction", "std::zfunction2"));
5265 /* Check that whitespace is ignored appropriately. A symbol with a
5266 template argument list. */
5268 static const char expected[] = "ns::foo<int>";
5269 CHECK_MATCH ("ns :: foo < int > ", symbol_name_match_type::FULL, false,
5271 CHECK_MATCH ("foo < int > ", symbol_name_match_type::WILD, false,
5275 /* Check that whitespace is ignored appropriately. A symbol with a
5276 template argument list that includes a pointer. */
5278 static const char expected[] = "ns::foo<char*>";
5279 /* Try both completion and non-completion modes. */
5280 static const bool completion_mode[2] = {false, true};
5281 for (size_t i = 0; i < 2; i++)
5283 CHECK_MATCH ("ns :: foo < char * >", symbol_name_match_type::FULL,
5284 completion_mode[i], EXPECT (expected));
5285 CHECK_MATCH ("foo < char * >", symbol_name_match_type::WILD,
5286 completion_mode[i], EXPECT (expected));
5288 CHECK_MATCH ("ns :: foo < char * > (int)", symbol_name_match_type::FULL,
5289 completion_mode[i], EXPECT (expected));
5290 CHECK_MATCH ("foo < char * > (int)", symbol_name_match_type::WILD,
5291 completion_mode[i], EXPECT (expected));
5296 /* Check method qualifiers are ignored. */
5297 static const char expected[] = "ns::foo<char*>";
5298 CHECK_MATCH ("ns :: foo < char * > ( int ) const",
5299 symbol_name_match_type::FULL, true, EXPECT (expected));
5300 CHECK_MATCH ("ns :: foo < char * > ( int ) &&",
5301 symbol_name_match_type::FULL, true, EXPECT (expected));
5302 CHECK_MATCH ("foo < char * > ( int ) const",
5303 symbol_name_match_type::WILD, true, EXPECT (expected));
5304 CHECK_MATCH ("foo < char * > ( int ) &&",
5305 symbol_name_match_type::WILD, true, EXPECT (expected));
5308 /* Test lookup names that don't match anything. */
5310 CHECK_MATCH ("bar2", symbol_name_match_type::WILD, false,
5313 CHECK_MATCH ("doesntexist", symbol_name_match_type::FULL, false,
5317 /* Some wild matching tests, exercising "(anonymous namespace)",
5318 which should not be confused with a parameter list. */
5320 static const char *syms[] = {
5324 "A :: B :: C ( int )",
5329 for (const char *s : syms)
5331 CHECK_MATCH (s, symbol_name_match_type::WILD, false,
5332 EXPECT ("(anonymous namespace)::A::B::C"));
5337 static const char expected[] = "ns2::tmpl<int>::foo2";
5338 CHECK_MATCH ("tmp", symbol_name_match_type::WILD, true,
5340 CHECK_MATCH ("tmpl<", symbol_name_match_type::WILD, true,
5344 SELF_CHECK (!any_mismatch);
5353 test_mapped_index_find_name_component_bounds ();
5354 test_dw2_expand_symtabs_matching_symbol ();
5357 }} // namespace selftests::dw2_expand_symtabs_matching
5359 #endif /* GDB_SELF_TEST */
5361 /* If FILE_MATCHER is NULL or if PER_CU has
5362 dwarf2_per_cu_quick_data::MARK set (see
5363 dw_expand_symtabs_matching_file_matcher), expand the CU and call
5364 EXPANSION_NOTIFY on it. */
5367 dw2_expand_symtabs_matching_one
5368 (struct dwarf2_per_cu_data *per_cu,
5369 gdb::function_view<expand_symtabs_file_matcher_ftype> file_matcher,
5370 gdb::function_view<expand_symtabs_exp_notify_ftype> expansion_notify)
5372 if (file_matcher == NULL || per_cu->v.quick->mark)
5374 bool symtab_was_null
5375 = (per_cu->v.quick->compunit_symtab == NULL);
5377 dw2_instantiate_symtab (per_cu);
5379 if (expansion_notify != NULL
5381 && per_cu->v.quick->compunit_symtab != NULL)
5382 expansion_notify (per_cu->v.quick->compunit_symtab);
5386 /* Helper for dw2_expand_matching symtabs. Called on each symbol
5387 matched, to expand corresponding CUs that were marked. IDX is the
5388 index of the symbol name that matched. */
5391 dw2_expand_marked_cus
5392 (struct dwarf2_per_objfile *dwarf2_per_objfile, offset_type idx,
5393 gdb::function_view<expand_symtabs_file_matcher_ftype> file_matcher,
5394 gdb::function_view<expand_symtabs_exp_notify_ftype> expansion_notify,
5397 offset_type *vec, vec_len, vec_idx;
5398 bool global_seen = false;
5399 mapped_index &index = *dwarf2_per_objfile->index_table;
5401 vec = (offset_type *) (index.constant_pool
5402 + MAYBE_SWAP (index.symbol_table[idx].vec));
5403 vec_len = MAYBE_SWAP (vec[0]);
5404 for (vec_idx = 0; vec_idx < vec_len; ++vec_idx)
5406 struct dwarf2_per_cu_data *per_cu;
5407 offset_type cu_index_and_attrs = MAYBE_SWAP (vec[vec_idx + 1]);
5408 /* This value is only valid for index versions >= 7. */
5409 int is_static = GDB_INDEX_SYMBOL_STATIC_VALUE (cu_index_and_attrs);
5410 gdb_index_symbol_kind symbol_kind =
5411 GDB_INDEX_SYMBOL_KIND_VALUE (cu_index_and_attrs);
5412 int cu_index = GDB_INDEX_CU_VALUE (cu_index_and_attrs);
5413 /* Only check the symbol attributes if they're present.
5414 Indices prior to version 7 don't record them,
5415 and indices >= 7 may elide them for certain symbols
5416 (gold does this). */
5419 && symbol_kind != GDB_INDEX_SYMBOL_KIND_NONE);
5421 /* Work around gold/15646. */
5424 if (!is_static && global_seen)
5430 /* Only check the symbol's kind if it has one. */
5435 case VARIABLES_DOMAIN:
5436 if (symbol_kind != GDB_INDEX_SYMBOL_KIND_VARIABLE)
5439 case FUNCTIONS_DOMAIN:
5440 if (symbol_kind != GDB_INDEX_SYMBOL_KIND_FUNCTION)
5444 if (symbol_kind != GDB_INDEX_SYMBOL_KIND_TYPE)
5452 /* Don't crash on bad data. */
5453 if (cu_index >= (dwarf2_per_objfile->n_comp_units
5454 + dwarf2_per_objfile->n_type_units))
5456 complaint (&symfile_complaints,
5457 _(".gdb_index entry has bad CU index"
5459 objfile_name (dwarf2_per_objfile->objfile));
5463 per_cu = dw2_get_cutu (dwarf2_per_objfile, cu_index);
5464 dw2_expand_symtabs_matching_one (per_cu, file_matcher,
5469 /* If FILE_MATCHER is non-NULL, set all the
5470 dwarf2_per_cu_quick_data::MARK of the current DWARF2_PER_OBJFILE
5471 that match FILE_MATCHER. */
5474 dw_expand_symtabs_matching_file_matcher
5475 (struct dwarf2_per_objfile *dwarf2_per_objfile,
5476 gdb::function_view<expand_symtabs_file_matcher_ftype> file_matcher)
5478 if (file_matcher == NULL)
5481 objfile *const objfile = dwarf2_per_objfile->objfile;
5483 htab_up visited_found (htab_create_alloc (10, htab_hash_pointer,
5485 NULL, xcalloc, xfree));
5486 htab_up visited_not_found (htab_create_alloc (10, htab_hash_pointer,
5488 NULL, xcalloc, xfree));
5490 /* The rule is CUs specify all the files, including those used by
5491 any TU, so there's no need to scan TUs here. */
5493 for (int i = 0; i < dwarf2_per_objfile->n_comp_units; ++i)
5496 struct dwarf2_per_cu_data *per_cu = dw2_get_cu (dwarf2_per_objfile, i);
5497 struct quick_file_names *file_data;
5502 per_cu->v.quick->mark = 0;
5504 /* We only need to look at symtabs not already expanded. */
5505 if (per_cu->v.quick->compunit_symtab)
5508 file_data = dw2_get_file_names (per_cu);
5509 if (file_data == NULL)
5512 if (htab_find (visited_not_found.get (), file_data) != NULL)
5514 else if (htab_find (visited_found.get (), file_data) != NULL)
5516 per_cu->v.quick->mark = 1;
5520 for (j = 0; j < file_data->num_file_names; ++j)
5522 const char *this_real_name;
5524 if (file_matcher (file_data->file_names[j], false))
5526 per_cu->v.quick->mark = 1;
5530 /* Before we invoke realpath, which can get expensive when many
5531 files are involved, do a quick comparison of the basenames. */
5532 if (!basenames_may_differ
5533 && !file_matcher (lbasename (file_data->file_names[j]),
5537 this_real_name = dw2_get_real_path (objfile, file_data, j);
5538 if (file_matcher (this_real_name, false))
5540 per_cu->v.quick->mark = 1;
5545 slot = htab_find_slot (per_cu->v.quick->mark
5546 ? visited_found.get ()
5547 : visited_not_found.get (),
5554 dw2_expand_symtabs_matching
5555 (struct objfile *objfile,
5556 gdb::function_view<expand_symtabs_file_matcher_ftype> file_matcher,
5557 const lookup_name_info &lookup_name,
5558 gdb::function_view<expand_symtabs_symbol_matcher_ftype> symbol_matcher,
5559 gdb::function_view<expand_symtabs_exp_notify_ftype> expansion_notify,
5560 enum search_domain kind)
5562 struct dwarf2_per_objfile *dwarf2_per_objfile
5563 = get_dwarf2_per_objfile (objfile);
5565 /* index_table is NULL if OBJF_READNOW. */
5566 if (!dwarf2_per_objfile->index_table)
5569 dw_expand_symtabs_matching_file_matcher (dwarf2_per_objfile, file_matcher);
5571 mapped_index &index = *dwarf2_per_objfile->index_table;
5573 dw2_expand_symtabs_matching_symbol (index, lookup_name,
5575 kind, [&] (offset_type idx)
5577 dw2_expand_marked_cus (dwarf2_per_objfile, idx, file_matcher,
5578 expansion_notify, kind);
5582 /* A helper for dw2_find_pc_sect_compunit_symtab which finds the most specific
5585 static struct compunit_symtab *
5586 recursively_find_pc_sect_compunit_symtab (struct compunit_symtab *cust,
5591 if (COMPUNIT_BLOCKVECTOR (cust) != NULL
5592 && blockvector_contains_pc (COMPUNIT_BLOCKVECTOR (cust), pc))
5595 if (cust->includes == NULL)
5598 for (i = 0; cust->includes[i]; ++i)
5600 struct compunit_symtab *s = cust->includes[i];
5602 s = recursively_find_pc_sect_compunit_symtab (s, pc);
5610 static struct compunit_symtab *
5611 dw2_find_pc_sect_compunit_symtab (struct objfile *objfile,
5612 struct bound_minimal_symbol msymbol,
5614 struct obj_section *section,
5617 struct dwarf2_per_cu_data *data;
5618 struct compunit_symtab *result;
5620 if (!objfile->psymtabs_addrmap)
5623 data = (struct dwarf2_per_cu_data *) addrmap_find (objfile->psymtabs_addrmap,
5628 if (warn_if_readin && data->v.quick->compunit_symtab)
5629 warning (_("(Internal error: pc %s in read in CU, but not in symtab.)"),
5630 paddress (get_objfile_arch (objfile), pc));
5633 = recursively_find_pc_sect_compunit_symtab (dw2_instantiate_symtab (data),
5635 gdb_assert (result != NULL);
5640 dw2_map_symbol_filenames (struct objfile *objfile, symbol_filename_ftype *fun,
5641 void *data, int need_fullname)
5643 struct dwarf2_per_objfile *dwarf2_per_objfile
5644 = get_dwarf2_per_objfile (objfile);
5646 if (!dwarf2_per_objfile->filenames_cache)
5648 dwarf2_per_objfile->filenames_cache.emplace ();
5650 htab_up visited (htab_create_alloc (10,
5651 htab_hash_pointer, htab_eq_pointer,
5652 NULL, xcalloc, xfree));
5654 /* The rule is CUs specify all the files, including those used
5655 by any TU, so there's no need to scan TUs here. We can
5656 ignore file names coming from already-expanded CUs. */
5658 for (int i = 0; i < dwarf2_per_objfile->n_comp_units; ++i)
5660 dwarf2_per_cu_data *per_cu = dw2_get_cutu (dwarf2_per_objfile, i);
5662 if (per_cu->v.quick->compunit_symtab)
5664 void **slot = htab_find_slot (visited.get (),
5665 per_cu->v.quick->file_names,
5668 *slot = per_cu->v.quick->file_names;
5672 for (int i = 0; i < dwarf2_per_objfile->n_comp_units; ++i)
5674 dwarf2_per_cu_data *per_cu = dw2_get_cu (dwarf2_per_objfile, i);
5675 struct quick_file_names *file_data;
5678 /* We only need to look at symtabs not already expanded. */
5679 if (per_cu->v.quick->compunit_symtab)
5682 file_data = dw2_get_file_names (per_cu);
5683 if (file_data == NULL)
5686 slot = htab_find_slot (visited.get (), file_data, INSERT);
5689 /* Already visited. */
5694 for (int j = 0; j < file_data->num_file_names; ++j)
5696 const char *filename = file_data->file_names[j];
5697 dwarf2_per_objfile->filenames_cache->seen (filename);
5702 dwarf2_per_objfile->filenames_cache->traverse ([&] (const char *filename)
5704 gdb::unique_xmalloc_ptr<char> this_real_name;
5707 this_real_name = gdb_realpath (filename);
5708 (*fun) (filename, this_real_name.get (), data);
5713 dw2_has_symbols (struct objfile *objfile)
5718 const struct quick_symbol_functions dwarf2_gdb_index_functions =
5721 dw2_find_last_source_symtab,
5722 dw2_forget_cached_source_info,
5723 dw2_map_symtabs_matching_filename,
5728 dw2_expand_symtabs_for_function,
5729 dw2_expand_all_symtabs,
5730 dw2_expand_symtabs_with_fullname,
5731 dw2_map_matching_symbols,
5732 dw2_expand_symtabs_matching,
5733 dw2_find_pc_sect_compunit_symtab,
5735 dw2_map_symbol_filenames
5738 /* DWARF-5 debug_names reader. */
5740 /* DWARF-5 augmentation string for GDB's DW_IDX_GNU_* extension. */
5741 static const gdb_byte dwarf5_augmentation[] = { 'G', 'D', 'B', 0 };
5743 /* A helper function that reads the .debug_names section in SECTION
5744 and fills in MAP. FILENAME is the name of the file containing the
5745 section; it is used for error reporting.
5747 Returns true if all went well, false otherwise. */
5750 read_debug_names_from_section (struct objfile *objfile,
5751 const char *filename,
5752 struct dwarf2_section_info *section,
5753 mapped_debug_names &map)
5755 if (dwarf2_section_empty_p (section))
5758 /* Older elfutils strip versions could keep the section in the main
5759 executable while splitting it for the separate debug info file. */
5760 if ((get_section_flags (section) & SEC_HAS_CONTENTS) == 0)
5763 dwarf2_read_section (objfile, section);
5765 map.dwarf5_byte_order = gdbarch_byte_order (get_objfile_arch (objfile));
5767 const gdb_byte *addr = section->buffer;
5769 bfd *const abfd = get_section_bfd_owner (section);
5771 unsigned int bytes_read;
5772 LONGEST length = read_initial_length (abfd, addr, &bytes_read);
5775 map.dwarf5_is_dwarf64 = bytes_read != 4;
5776 map.offset_size = map.dwarf5_is_dwarf64 ? 8 : 4;
5777 if (bytes_read + length != section->size)
5779 /* There may be multiple per-CU indices. */
5780 warning (_("Section .debug_names in %s length %s does not match "
5781 "section length %s, ignoring .debug_names."),
5782 filename, plongest (bytes_read + length),
5783 pulongest (section->size));
5787 /* The version number. */
5788 uint16_t version = read_2_bytes (abfd, addr);
5792 warning (_("Section .debug_names in %s has unsupported version %d, "
5793 "ignoring .debug_names."),
5799 uint16_t padding = read_2_bytes (abfd, addr);
5803 warning (_("Section .debug_names in %s has unsupported padding %d, "
5804 "ignoring .debug_names."),
5809 /* comp_unit_count - The number of CUs in the CU list. */
5810 map.cu_count = read_4_bytes (abfd, addr);
5813 /* local_type_unit_count - The number of TUs in the local TU
5815 map.tu_count = read_4_bytes (abfd, addr);
5818 /* foreign_type_unit_count - The number of TUs in the foreign TU
5820 uint32_t foreign_tu_count = read_4_bytes (abfd, addr);
5822 if (foreign_tu_count != 0)
5824 warning (_("Section .debug_names in %s has unsupported %lu foreign TUs, "
5825 "ignoring .debug_names."),
5826 filename, static_cast<unsigned long> (foreign_tu_count));
5830 /* bucket_count - The number of hash buckets in the hash lookup
5832 map.bucket_count = read_4_bytes (abfd, addr);
5835 /* name_count - The number of unique names in the index. */
5836 map.name_count = read_4_bytes (abfd, addr);
5839 /* abbrev_table_size - The size in bytes of the abbreviations
5841 uint32_t abbrev_table_size = read_4_bytes (abfd, addr);
5844 /* augmentation_string_size - The size in bytes of the augmentation
5845 string. This value is rounded up to a multiple of 4. */
5846 uint32_t augmentation_string_size = read_4_bytes (abfd, addr);
5848 map.augmentation_is_gdb = ((augmentation_string_size
5849 == sizeof (dwarf5_augmentation))
5850 && memcmp (addr, dwarf5_augmentation,
5851 sizeof (dwarf5_augmentation)) == 0);
5852 augmentation_string_size += (-augmentation_string_size) & 3;
5853 addr += augmentation_string_size;
5856 map.cu_table_reordered = addr;
5857 addr += map.cu_count * map.offset_size;
5859 /* List of Local TUs */
5860 map.tu_table_reordered = addr;
5861 addr += map.tu_count * map.offset_size;
5863 /* Hash Lookup Table */
5864 map.bucket_table_reordered = reinterpret_cast<const uint32_t *> (addr);
5865 addr += map.bucket_count * 4;
5866 map.hash_table_reordered = reinterpret_cast<const uint32_t *> (addr);
5867 addr += map.name_count * 4;
5870 map.name_table_string_offs_reordered = addr;
5871 addr += map.name_count * map.offset_size;
5872 map.name_table_entry_offs_reordered = addr;
5873 addr += map.name_count * map.offset_size;
5875 const gdb_byte *abbrev_table_start = addr;
5878 unsigned int bytes_read;
5879 const ULONGEST index_num = read_unsigned_leb128 (abfd, addr, &bytes_read);
5884 const auto insertpair
5885 = map.abbrev_map.emplace (index_num, mapped_debug_names::index_val ());
5886 if (!insertpair.second)
5888 warning (_("Section .debug_names in %s has duplicate index %s, "
5889 "ignoring .debug_names."),
5890 filename, pulongest (index_num));
5893 mapped_debug_names::index_val &indexval = insertpair.first->second;
5894 indexval.dwarf_tag = read_unsigned_leb128 (abfd, addr, &bytes_read);
5899 mapped_debug_names::index_val::attr attr;
5900 attr.dw_idx = read_unsigned_leb128 (abfd, addr, &bytes_read);
5902 attr.form = read_unsigned_leb128 (abfd, addr, &bytes_read);
5904 if (attr.form == DW_FORM_implicit_const)
5906 attr.implicit_const = read_signed_leb128 (abfd, addr,
5910 if (attr.dw_idx == 0 && attr.form == 0)
5912 indexval.attr_vec.push_back (std::move (attr));
5915 if (addr != abbrev_table_start + abbrev_table_size)
5917 warning (_("Section .debug_names in %s has abbreviation_table "
5918 "of size %zu vs. written as %u, ignoring .debug_names."),
5919 filename, addr - abbrev_table_start, abbrev_table_size);
5922 map.entry_pool = addr;
5927 /* A helper for create_cus_from_debug_names that handles the MAP's CU
5931 create_cus_from_debug_names_list (struct dwarf2_per_objfile *dwarf2_per_objfile,
5932 const mapped_debug_names &map,
5933 dwarf2_section_info §ion,
5934 bool is_dwz, int base_offset)
5936 sect_offset sect_off_prev;
5937 for (uint32_t i = 0; i <= map.cu_count; ++i)
5939 sect_offset sect_off_next;
5940 if (i < map.cu_count)
5943 = (sect_offset) (extract_unsigned_integer
5944 (map.cu_table_reordered + i * map.offset_size,
5946 map.dwarf5_byte_order));
5949 sect_off_next = (sect_offset) section.size;
5952 const ULONGEST length = sect_off_next - sect_off_prev;
5953 dwarf2_per_objfile->all_comp_units[base_offset + (i - 1)]
5954 = create_cu_from_index_list (dwarf2_per_objfile, §ion, is_dwz,
5955 sect_off_prev, length);
5957 sect_off_prev = sect_off_next;
5961 /* Read the CU list from the mapped index, and use it to create all
5962 the CU objects for this dwarf2_per_objfile. */
5965 create_cus_from_debug_names (struct dwarf2_per_objfile *dwarf2_per_objfile,
5966 const mapped_debug_names &map,
5967 const mapped_debug_names &dwz_map)
5969 struct objfile *objfile = dwarf2_per_objfile->objfile;
5971 dwarf2_per_objfile->n_comp_units = map.cu_count + dwz_map.cu_count;
5972 dwarf2_per_objfile->all_comp_units
5973 = XOBNEWVEC (&objfile->objfile_obstack, struct dwarf2_per_cu_data *,
5974 dwarf2_per_objfile->n_comp_units);
5976 create_cus_from_debug_names_list (dwarf2_per_objfile, map,
5977 dwarf2_per_objfile->info,
5979 0 /* base_offset */);
5981 if (dwz_map.cu_count == 0)
5984 dwz_file *dwz = dwarf2_get_dwz_file (dwarf2_per_objfile);
5985 create_cus_from_debug_names_list (dwarf2_per_objfile, dwz_map, dwz->info,
5987 map.cu_count /* base_offset */);
5990 /* Read .debug_names. If everything went ok, initialize the "quick"
5991 elements of all the CUs and return true. Otherwise, return false. */
5994 dwarf2_read_debug_names (struct dwarf2_per_objfile *dwarf2_per_objfile)
5996 mapped_debug_names local_map (dwarf2_per_objfile);
5997 mapped_debug_names dwz_map (dwarf2_per_objfile);
5998 struct objfile *objfile = dwarf2_per_objfile->objfile;
6000 if (!read_debug_names_from_section (objfile, objfile_name (objfile),
6001 &dwarf2_per_objfile->debug_names,
6005 /* Don't use the index if it's empty. */
6006 if (local_map.name_count == 0)
6009 /* If there is a .dwz file, read it so we can get its CU list as
6011 dwz_file *dwz = dwarf2_get_dwz_file (dwarf2_per_objfile);
6014 if (!read_debug_names_from_section (objfile,
6015 bfd_get_filename (dwz->dwz_bfd),
6016 &dwz->debug_names, dwz_map))
6018 warning (_("could not read '.debug_names' section from %s; skipping"),
6019 bfd_get_filename (dwz->dwz_bfd));
6024 create_cus_from_debug_names (dwarf2_per_objfile, local_map, dwz_map);
6026 if (local_map.tu_count != 0)
6028 /* We can only handle a single .debug_types when we have an
6030 if (VEC_length (dwarf2_section_info_def, dwarf2_per_objfile->types) != 1)
6033 dwarf2_section_info *section = VEC_index (dwarf2_section_info_def,
6034 dwarf2_per_objfile->types, 0);
6036 create_signatured_type_table_from_debug_names
6037 (dwarf2_per_objfile, local_map, section, &dwarf2_per_objfile->abbrev);
6040 create_addrmap_from_aranges (dwarf2_per_objfile,
6041 &dwarf2_per_objfile->debug_aranges);
6043 dwarf2_per_objfile->debug_names_table.reset
6044 (new mapped_debug_names (dwarf2_per_objfile));
6045 *dwarf2_per_objfile->debug_names_table = std::move (local_map);
6046 dwarf2_per_objfile->using_index = 1;
6047 dwarf2_per_objfile->quick_file_names_table =
6048 create_quick_file_names_table (dwarf2_per_objfile->n_comp_units);
6053 /* Symbol name hashing function as specified by DWARF-5. */
6056 dwarf5_djb_hash (const char *str_)
6058 const unsigned char *str = (const unsigned char *) str_;
6060 /* Note: tolower here ignores UTF-8, which isn't fully compliant.
6061 See http://dwarfstd.org/ShowIssue.php?issue=161027.1. */
6063 uint32_t hash = 5381;
6064 while (int c = *str++)
6065 hash = hash * 33 + tolower (c);
6069 /* Type used to manage iterating over all CUs looking for a symbol for
6072 class dw2_debug_names_iterator
6075 /* If WANT_SPECIFIC_BLOCK is true, only look for symbols in block
6076 BLOCK_INDEX. Otherwise BLOCK_INDEX is ignored. */
6077 dw2_debug_names_iterator (const mapped_debug_names &map,
6078 bool want_specific_block,
6079 block_enum block_index, domain_enum domain,
6081 : m_map (map), m_want_specific_block (want_specific_block),
6082 m_block_index (block_index), m_domain (domain),
6083 m_addr (find_vec_in_debug_names (map, name))
6086 dw2_debug_names_iterator (const mapped_debug_names &map,
6087 search_domain search, uint32_t namei)
6090 m_addr (find_vec_in_debug_names (map, namei))
6093 /* Return the next matching CU or NULL if there are no more. */
6094 dwarf2_per_cu_data *next ();
6097 static const gdb_byte *find_vec_in_debug_names (const mapped_debug_names &map,
6099 static const gdb_byte *find_vec_in_debug_names (const mapped_debug_names &map,
6102 /* The internalized form of .debug_names. */
6103 const mapped_debug_names &m_map;
6105 /* If true, only look for symbols that match BLOCK_INDEX. */
6106 const bool m_want_specific_block = false;
6108 /* One of GLOBAL_BLOCK or STATIC_BLOCK.
6109 Unused if !WANT_SPECIFIC_BLOCK - FIRST_LOCAL_BLOCK is an invalid
6111 const block_enum m_block_index = FIRST_LOCAL_BLOCK;
6113 /* The kind of symbol we're looking for. */
6114 const domain_enum m_domain = UNDEF_DOMAIN;
6115 const search_domain m_search = ALL_DOMAIN;
6117 /* The list of CUs from the index entry of the symbol, or NULL if
6119 const gdb_byte *m_addr;
6123 mapped_debug_names::namei_to_name (uint32_t namei) const
6125 const ULONGEST namei_string_offs
6126 = extract_unsigned_integer ((name_table_string_offs_reordered
6127 + namei * offset_size),
6130 return read_indirect_string_at_offset
6131 (dwarf2_per_objfile, dwarf2_per_objfile->objfile->obfd, namei_string_offs);
6134 /* Find a slot in .debug_names for the object named NAME. If NAME is
6135 found, return pointer to its pool data. If NAME cannot be found,
6139 dw2_debug_names_iterator::find_vec_in_debug_names
6140 (const mapped_debug_names &map, const char *name)
6142 int (*cmp) (const char *, const char *);
6144 if (current_language->la_language == language_cplus
6145 || current_language->la_language == language_fortran
6146 || current_language->la_language == language_d)
6148 /* NAME is already canonical. Drop any qualifiers as
6149 .debug_names does not contain any. */
6151 if (strchr (name, '(') != NULL)
6153 gdb::unique_xmalloc_ptr<char> without_params
6154 = cp_remove_params (name);
6156 if (without_params != NULL)
6158 name = without_params.get();
6163 cmp = (case_sensitivity == case_sensitive_on ? strcmp : strcasecmp);
6165 const uint32_t full_hash = dwarf5_djb_hash (name);
6167 = extract_unsigned_integer (reinterpret_cast<const gdb_byte *>
6168 (map.bucket_table_reordered
6169 + (full_hash % map.bucket_count)), 4,
6170 map.dwarf5_byte_order);
6174 if (namei >= map.name_count)
6176 complaint (&symfile_complaints,
6177 _("Wrong .debug_names with name index %u but name_count=%u "
6179 namei, map.name_count,
6180 objfile_name (map.dwarf2_per_objfile->objfile));
6186 const uint32_t namei_full_hash
6187 = extract_unsigned_integer (reinterpret_cast<const gdb_byte *>
6188 (map.hash_table_reordered + namei), 4,
6189 map.dwarf5_byte_order);
6190 if (full_hash % map.bucket_count != namei_full_hash % map.bucket_count)
6193 if (full_hash == namei_full_hash)
6195 const char *const namei_string = map.namei_to_name (namei);
6197 #if 0 /* An expensive sanity check. */
6198 if (namei_full_hash != dwarf5_djb_hash (namei_string))
6200 complaint (&symfile_complaints,
6201 _("Wrong .debug_names hash for string at index %u "
6203 namei, objfile_name (dwarf2_per_objfile->objfile));
6208 if (cmp (namei_string, name) == 0)
6210 const ULONGEST namei_entry_offs
6211 = extract_unsigned_integer ((map.name_table_entry_offs_reordered
6212 + namei * map.offset_size),
6213 map.offset_size, map.dwarf5_byte_order);
6214 return map.entry_pool + namei_entry_offs;
6219 if (namei >= map.name_count)
6225 dw2_debug_names_iterator::find_vec_in_debug_names
6226 (const mapped_debug_names &map, uint32_t namei)
6228 if (namei >= map.name_count)
6230 complaint (&symfile_complaints,
6231 _("Wrong .debug_names with name index %u but name_count=%u "
6233 namei, map.name_count,
6234 objfile_name (map.dwarf2_per_objfile->objfile));
6238 const ULONGEST namei_entry_offs
6239 = extract_unsigned_integer ((map.name_table_entry_offs_reordered
6240 + namei * map.offset_size),
6241 map.offset_size, map.dwarf5_byte_order);
6242 return map.entry_pool + namei_entry_offs;
6245 /* See dw2_debug_names_iterator. */
6247 dwarf2_per_cu_data *
6248 dw2_debug_names_iterator::next ()
6253 struct dwarf2_per_objfile *dwarf2_per_objfile = m_map.dwarf2_per_objfile;
6254 struct objfile *objfile = dwarf2_per_objfile->objfile;
6255 bfd *const abfd = objfile->obfd;
6259 unsigned int bytes_read;
6260 const ULONGEST abbrev = read_unsigned_leb128 (abfd, m_addr, &bytes_read);
6261 m_addr += bytes_read;
6265 const auto indexval_it = m_map.abbrev_map.find (abbrev);
6266 if (indexval_it == m_map.abbrev_map.cend ())
6268 complaint (&symfile_complaints,
6269 _("Wrong .debug_names undefined abbrev code %s "
6271 pulongest (abbrev), objfile_name (objfile));
6274 const mapped_debug_names::index_val &indexval = indexval_it->second;
6275 bool have_is_static = false;
6277 dwarf2_per_cu_data *per_cu = NULL;
6278 for (const mapped_debug_names::index_val::attr &attr : indexval.attr_vec)
6283 case DW_FORM_implicit_const:
6284 ull = attr.implicit_const;
6286 case DW_FORM_flag_present:
6290 ull = read_unsigned_leb128 (abfd, m_addr, &bytes_read);
6291 m_addr += bytes_read;
6294 complaint (&symfile_complaints,
6295 _("Unsupported .debug_names form %s [in module %s]"),
6296 dwarf_form_name (attr.form),
6297 objfile_name (objfile));
6300 switch (attr.dw_idx)
6302 case DW_IDX_compile_unit:
6303 /* Don't crash on bad data. */
6304 if (ull >= dwarf2_per_objfile->n_comp_units)
6306 complaint (&symfile_complaints,
6307 _(".debug_names entry has bad CU index %s"
6310 objfile_name (dwarf2_per_objfile->objfile));
6313 per_cu = dw2_get_cutu (dwarf2_per_objfile, ull);
6315 case DW_IDX_type_unit:
6316 /* Don't crash on bad data. */
6317 if (ull >= dwarf2_per_objfile->n_type_units)
6319 complaint (&symfile_complaints,
6320 _(".debug_names entry has bad TU index %s"
6323 objfile_name (dwarf2_per_objfile->objfile));
6326 per_cu = dw2_get_cutu (dwarf2_per_objfile,
6327 dwarf2_per_objfile->n_comp_units + ull);
6329 case DW_IDX_GNU_internal:
6330 if (!m_map.augmentation_is_gdb)
6332 have_is_static = true;
6335 case DW_IDX_GNU_external:
6336 if (!m_map.augmentation_is_gdb)
6338 have_is_static = true;
6344 /* Skip if already read in. */
6345 if (per_cu->v.quick->compunit_symtab)
6348 /* Check static vs global. */
6351 const bool want_static = m_block_index != GLOBAL_BLOCK;
6352 if (m_want_specific_block && want_static != is_static)
6356 /* Match dw2_symtab_iter_next, symbol_kind
6357 and debug_names::psymbol_tag. */
6361 switch (indexval.dwarf_tag)
6363 case DW_TAG_variable:
6364 case DW_TAG_subprogram:
6365 /* Some types are also in VAR_DOMAIN. */
6366 case DW_TAG_typedef:
6367 case DW_TAG_structure_type:
6374 switch (indexval.dwarf_tag)
6376 case DW_TAG_typedef:
6377 case DW_TAG_structure_type:
6384 switch (indexval.dwarf_tag)
6387 case DW_TAG_variable:
6397 /* Match dw2_expand_symtabs_matching, symbol_kind and
6398 debug_names::psymbol_tag. */
6401 case VARIABLES_DOMAIN:
6402 switch (indexval.dwarf_tag)
6404 case DW_TAG_variable:
6410 case FUNCTIONS_DOMAIN:
6411 switch (indexval.dwarf_tag)
6413 case DW_TAG_subprogram:
6420 switch (indexval.dwarf_tag)
6422 case DW_TAG_typedef:
6423 case DW_TAG_structure_type:
6436 static struct compunit_symtab *
6437 dw2_debug_names_lookup_symbol (struct objfile *objfile, int block_index_int,
6438 const char *name, domain_enum domain)
6440 const block_enum block_index = static_cast<block_enum> (block_index_int);
6441 struct dwarf2_per_objfile *dwarf2_per_objfile
6442 = get_dwarf2_per_objfile (objfile);
6444 const auto &mapp = dwarf2_per_objfile->debug_names_table;
6447 /* index is NULL if OBJF_READNOW. */
6450 const auto &map = *mapp;
6452 dw2_debug_names_iterator iter (map, true /* want_specific_block */,
6453 block_index, domain, name);
6455 struct compunit_symtab *stab_best = NULL;
6456 struct dwarf2_per_cu_data *per_cu;
6457 while ((per_cu = iter.next ()) != NULL)
6459 struct symbol *sym, *with_opaque = NULL;
6460 struct compunit_symtab *stab = dw2_instantiate_symtab (per_cu);
6461 const struct blockvector *bv = COMPUNIT_BLOCKVECTOR (stab);
6462 struct block *block = BLOCKVECTOR_BLOCK (bv, block_index);
6464 sym = block_find_symbol (block, name, domain,
6465 block_find_non_opaque_type_preferred,
6468 /* Some caution must be observed with overloaded functions and
6469 methods, since the index will not contain any overload
6470 information (but NAME might contain it). */
6473 && strcmp_iw (SYMBOL_SEARCH_NAME (sym), name) == 0)
6475 if (with_opaque != NULL
6476 && strcmp_iw (SYMBOL_SEARCH_NAME (with_opaque), name) == 0)
6479 /* Keep looking through other CUs. */
6485 /* This dumps minimal information about .debug_names. It is called
6486 via "mt print objfiles". The gdb.dwarf2/gdb-index.exp testcase
6487 uses this to verify that .debug_names has been loaded. */
6490 dw2_debug_names_dump (struct objfile *objfile)
6492 struct dwarf2_per_objfile *dwarf2_per_objfile
6493 = get_dwarf2_per_objfile (objfile);
6495 gdb_assert (dwarf2_per_objfile->using_index);
6496 printf_filtered (".debug_names:");
6497 if (dwarf2_per_objfile->debug_names_table)
6498 printf_filtered (" exists\n");
6500 printf_filtered (" faked for \"readnow\"\n");
6501 printf_filtered ("\n");
6505 dw2_debug_names_expand_symtabs_for_function (struct objfile *objfile,
6506 const char *func_name)
6508 struct dwarf2_per_objfile *dwarf2_per_objfile
6509 = get_dwarf2_per_objfile (objfile);
6511 /* dwarf2_per_objfile->debug_names_table is NULL if OBJF_READNOW. */
6512 if (dwarf2_per_objfile->debug_names_table)
6514 const mapped_debug_names &map = *dwarf2_per_objfile->debug_names_table;
6516 /* Note: It doesn't matter what we pass for block_index here. */
6517 dw2_debug_names_iterator iter (map, false /* want_specific_block */,
6518 GLOBAL_BLOCK, VAR_DOMAIN, func_name);
6520 struct dwarf2_per_cu_data *per_cu;
6521 while ((per_cu = iter.next ()) != NULL)
6522 dw2_instantiate_symtab (per_cu);
6527 dw2_debug_names_expand_symtabs_matching
6528 (struct objfile *objfile,
6529 gdb::function_view<expand_symtabs_file_matcher_ftype> file_matcher,
6530 const lookup_name_info &lookup_name,
6531 gdb::function_view<expand_symtabs_symbol_matcher_ftype> symbol_matcher,
6532 gdb::function_view<expand_symtabs_exp_notify_ftype> expansion_notify,
6533 enum search_domain kind)
6535 struct dwarf2_per_objfile *dwarf2_per_objfile
6536 = get_dwarf2_per_objfile (objfile);
6538 /* debug_names_table is NULL if OBJF_READNOW. */
6539 if (!dwarf2_per_objfile->debug_names_table)
6542 dw_expand_symtabs_matching_file_matcher (dwarf2_per_objfile, file_matcher);
6544 mapped_debug_names &map = *dwarf2_per_objfile->debug_names_table;
6546 dw2_expand_symtabs_matching_symbol (map, lookup_name,
6548 kind, [&] (offset_type namei)
6550 /* The name was matched, now expand corresponding CUs that were
6552 dw2_debug_names_iterator iter (map, kind, namei);
6554 struct dwarf2_per_cu_data *per_cu;
6555 while ((per_cu = iter.next ()) != NULL)
6556 dw2_expand_symtabs_matching_one (per_cu, file_matcher,
6561 const struct quick_symbol_functions dwarf2_debug_names_functions =
6564 dw2_find_last_source_symtab,
6565 dw2_forget_cached_source_info,
6566 dw2_map_symtabs_matching_filename,
6567 dw2_debug_names_lookup_symbol,
6569 dw2_debug_names_dump,
6571 dw2_debug_names_expand_symtabs_for_function,
6572 dw2_expand_all_symtabs,
6573 dw2_expand_symtabs_with_fullname,
6574 dw2_map_matching_symbols,
6575 dw2_debug_names_expand_symtabs_matching,
6576 dw2_find_pc_sect_compunit_symtab,
6578 dw2_map_symbol_filenames
6581 /* See symfile.h. */
6584 dwarf2_initialize_objfile (struct objfile *objfile, dw_index_kind *index_kind)
6586 struct dwarf2_per_objfile *dwarf2_per_objfile
6587 = get_dwarf2_per_objfile (objfile);
6589 /* If we're about to read full symbols, don't bother with the
6590 indices. In this case we also don't care if some other debug
6591 format is making psymtabs, because they are all about to be
6593 if ((objfile->flags & OBJF_READNOW))
6597 dwarf2_per_objfile->using_index = 1;
6598 create_all_comp_units (dwarf2_per_objfile);
6599 create_all_type_units (dwarf2_per_objfile);
6600 dwarf2_per_objfile->quick_file_names_table =
6601 create_quick_file_names_table (dwarf2_per_objfile->n_comp_units);
6603 for (i = 0; i < (dwarf2_per_objfile->n_comp_units
6604 + dwarf2_per_objfile->n_type_units); ++i)
6606 dwarf2_per_cu_data *per_cu = dw2_get_cutu (dwarf2_per_objfile, i);
6608 per_cu->v.quick = OBSTACK_ZALLOC (&objfile->objfile_obstack,
6609 struct dwarf2_per_cu_quick_data);
6612 /* Return 1 so that gdb sees the "quick" functions. However,
6613 these functions will be no-ops because we will have expanded
6615 *index_kind = dw_index_kind::GDB_INDEX;
6619 if (dwarf2_read_debug_names (dwarf2_per_objfile))
6621 *index_kind = dw_index_kind::DEBUG_NAMES;
6625 if (dwarf2_read_index (objfile))
6627 *index_kind = dw_index_kind::GDB_INDEX;
6636 /* Build a partial symbol table. */
6639 dwarf2_build_psymtabs (struct objfile *objfile)
6641 struct dwarf2_per_objfile *dwarf2_per_objfile
6642 = get_dwarf2_per_objfile (objfile);
6644 if (objfile->global_psymbols.capacity () == 0
6645 && objfile->static_psymbols.capacity () == 0)
6646 init_psymbol_list (objfile, 1024);
6650 /* This isn't really ideal: all the data we allocate on the
6651 objfile's obstack is still uselessly kept around. However,
6652 freeing it seems unsafe. */
6653 psymtab_discarder psymtabs (objfile);
6654 dwarf2_build_psymtabs_hard (dwarf2_per_objfile);
6657 CATCH (except, RETURN_MASK_ERROR)
6659 exception_print (gdb_stderr, except);
6664 /* Return the total length of the CU described by HEADER. */
6667 get_cu_length (const struct comp_unit_head *header)
6669 return header->initial_length_size + header->length;
6672 /* Return TRUE if SECT_OFF is within CU_HEADER. */
6675 offset_in_cu_p (const comp_unit_head *cu_header, sect_offset sect_off)
6677 sect_offset bottom = cu_header->sect_off;
6678 sect_offset top = cu_header->sect_off + get_cu_length (cu_header);
6680 return sect_off >= bottom && sect_off < top;
6683 /* Find the base address of the compilation unit for range lists and
6684 location lists. It will normally be specified by DW_AT_low_pc.
6685 In DWARF-3 draft 4, the base address could be overridden by
6686 DW_AT_entry_pc. It's been removed, but GCC still uses this for
6687 compilation units with discontinuous ranges. */
6690 dwarf2_find_base_address (struct die_info *die, struct dwarf2_cu *cu)
6692 struct attribute *attr;
6695 cu->base_address = 0;
6697 attr = dwarf2_attr (die, DW_AT_entry_pc, cu);
6700 cu->base_address = attr_value_as_address (attr);
6705 attr = dwarf2_attr (die, DW_AT_low_pc, cu);
6708 cu->base_address = attr_value_as_address (attr);
6714 /* Read in the comp unit header information from the debug_info at info_ptr.
6715 Use rcuh_kind::COMPILE as the default type if not known by the caller.
6716 NOTE: This leaves members offset, first_die_offset to be filled in
6719 static const gdb_byte *
6720 read_comp_unit_head (struct comp_unit_head *cu_header,
6721 const gdb_byte *info_ptr,
6722 struct dwarf2_section_info *section,
6723 rcuh_kind section_kind)
6726 unsigned int bytes_read;
6727 const char *filename = get_section_file_name (section);
6728 bfd *abfd = get_section_bfd_owner (section);
6730 cu_header->length = read_initial_length (abfd, info_ptr, &bytes_read);
6731 cu_header->initial_length_size = bytes_read;
6732 cu_header->offset_size = (bytes_read == 4) ? 4 : 8;
6733 info_ptr += bytes_read;
6734 cu_header->version = read_2_bytes (abfd, info_ptr);
6736 if (cu_header->version < 5)
6737 switch (section_kind)
6739 case rcuh_kind::COMPILE:
6740 cu_header->unit_type = DW_UT_compile;
6742 case rcuh_kind::TYPE:
6743 cu_header->unit_type = DW_UT_type;
6746 internal_error (__FILE__, __LINE__,
6747 _("read_comp_unit_head: invalid section_kind"));
6751 cu_header->unit_type = static_cast<enum dwarf_unit_type>
6752 (read_1_byte (abfd, info_ptr));
6754 switch (cu_header->unit_type)
6757 if (section_kind != rcuh_kind::COMPILE)
6758 error (_("Dwarf Error: wrong unit_type in compilation unit header "
6759 "(is DW_UT_compile, should be DW_UT_type) [in module %s]"),
6763 section_kind = rcuh_kind::TYPE;
6766 error (_("Dwarf Error: wrong unit_type in compilation unit header "
6767 "(is %d, should be %d or %d) [in module %s]"),
6768 cu_header->unit_type, DW_UT_compile, DW_UT_type, filename);
6771 cu_header->addr_size = read_1_byte (abfd, info_ptr);
6774 cu_header->abbrev_sect_off = (sect_offset) read_offset (abfd, info_ptr,
6777 info_ptr += bytes_read;
6778 if (cu_header->version < 5)
6780 cu_header->addr_size = read_1_byte (abfd, info_ptr);
6783 signed_addr = bfd_get_sign_extend_vma (abfd);
6784 if (signed_addr < 0)
6785 internal_error (__FILE__, __LINE__,
6786 _("read_comp_unit_head: dwarf from non elf file"));
6787 cu_header->signed_addr_p = signed_addr;
6789 if (section_kind == rcuh_kind::TYPE)
6791 LONGEST type_offset;
6793 cu_header->signature = read_8_bytes (abfd, info_ptr);
6796 type_offset = read_offset (abfd, info_ptr, cu_header, &bytes_read);
6797 info_ptr += bytes_read;
6798 cu_header->type_cu_offset_in_tu = (cu_offset) type_offset;
6799 if (to_underlying (cu_header->type_cu_offset_in_tu) != type_offset)
6800 error (_("Dwarf Error: Too big type_offset in compilation unit "
6801 "header (is %s) [in module %s]"), plongest (type_offset),
6808 /* Helper function that returns the proper abbrev section for
6811 static struct dwarf2_section_info *
6812 get_abbrev_section_for_cu (struct dwarf2_per_cu_data *this_cu)
6814 struct dwarf2_section_info *abbrev;
6815 struct dwarf2_per_objfile *dwarf2_per_objfile = this_cu->dwarf2_per_objfile;
6817 if (this_cu->is_dwz)
6818 abbrev = &dwarf2_get_dwz_file (dwarf2_per_objfile)->abbrev;
6820 abbrev = &dwarf2_per_objfile->abbrev;
6825 /* Subroutine of read_and_check_comp_unit_head and
6826 read_and_check_type_unit_head to simplify them.
6827 Perform various error checking on the header. */
6830 error_check_comp_unit_head (struct dwarf2_per_objfile *dwarf2_per_objfile,
6831 struct comp_unit_head *header,
6832 struct dwarf2_section_info *section,
6833 struct dwarf2_section_info *abbrev_section)
6835 const char *filename = get_section_file_name (section);
6837 if (header->version < 2 || header->version > 5)
6838 error (_("Dwarf Error: wrong version in compilation unit header "
6839 "(is %d, should be 2, 3, 4 or 5) [in module %s]"), header->version,
6842 if (to_underlying (header->abbrev_sect_off)
6843 >= dwarf2_section_size (dwarf2_per_objfile->objfile, abbrev_section))
6844 error (_("Dwarf Error: bad offset (%s) in compilation unit header "
6845 "(offset %s + 6) [in module %s]"),
6846 sect_offset_str (header->abbrev_sect_off),
6847 sect_offset_str (header->sect_off),
6850 /* Cast to ULONGEST to use 64-bit arithmetic when possible to
6851 avoid potential 32-bit overflow. */
6852 if (((ULONGEST) header->sect_off + get_cu_length (header))
6854 error (_("Dwarf Error: bad length (0x%x) in compilation unit header "
6855 "(offset %s + 0) [in module %s]"),
6856 header->length, sect_offset_str (header->sect_off),
6860 /* Read in a CU/TU header and perform some basic error checking.
6861 The contents of the header are stored in HEADER.
6862 The result is a pointer to the start of the first DIE. */
6864 static const gdb_byte *
6865 read_and_check_comp_unit_head (struct dwarf2_per_objfile *dwarf2_per_objfile,
6866 struct comp_unit_head *header,
6867 struct dwarf2_section_info *section,
6868 struct dwarf2_section_info *abbrev_section,
6869 const gdb_byte *info_ptr,
6870 rcuh_kind section_kind)
6872 const gdb_byte *beg_of_comp_unit = info_ptr;
6874 header->sect_off = (sect_offset) (beg_of_comp_unit - section->buffer);
6876 info_ptr = read_comp_unit_head (header, info_ptr, section, section_kind);
6878 header->first_die_cu_offset = (cu_offset) (info_ptr - beg_of_comp_unit);
6880 error_check_comp_unit_head (dwarf2_per_objfile, header, section,
6886 /* Fetch the abbreviation table offset from a comp or type unit header. */
6889 read_abbrev_offset (struct dwarf2_per_objfile *dwarf2_per_objfile,
6890 struct dwarf2_section_info *section,
6891 sect_offset sect_off)
6893 bfd *abfd = get_section_bfd_owner (section);
6894 const gdb_byte *info_ptr;
6895 unsigned int initial_length_size, offset_size;
6898 dwarf2_read_section (dwarf2_per_objfile->objfile, section);
6899 info_ptr = section->buffer + to_underlying (sect_off);
6900 read_initial_length (abfd, info_ptr, &initial_length_size);
6901 offset_size = initial_length_size == 4 ? 4 : 8;
6902 info_ptr += initial_length_size;
6904 version = read_2_bytes (abfd, info_ptr);
6908 /* Skip unit type and address size. */
6912 return (sect_offset) read_offset_1 (abfd, info_ptr, offset_size);
6915 /* Allocate a new partial symtab for file named NAME and mark this new
6916 partial symtab as being an include of PST. */
6919 dwarf2_create_include_psymtab (const char *name, struct partial_symtab *pst,
6920 struct objfile *objfile)
6922 struct partial_symtab *subpst = allocate_psymtab (name, objfile);
6924 if (!IS_ABSOLUTE_PATH (subpst->filename))
6926 /* It shares objfile->objfile_obstack. */
6927 subpst->dirname = pst->dirname;
6930 subpst->textlow = 0;
6931 subpst->texthigh = 0;
6933 subpst->dependencies
6934 = XOBNEW (&objfile->objfile_obstack, struct partial_symtab *);
6935 subpst->dependencies[0] = pst;
6936 subpst->number_of_dependencies = 1;
6938 subpst->globals_offset = 0;
6939 subpst->n_global_syms = 0;
6940 subpst->statics_offset = 0;
6941 subpst->n_static_syms = 0;
6942 subpst->compunit_symtab = NULL;
6943 subpst->read_symtab = pst->read_symtab;
6946 /* No private part is necessary for include psymtabs. This property
6947 can be used to differentiate between such include psymtabs and
6948 the regular ones. */
6949 subpst->read_symtab_private = NULL;
6952 /* Read the Line Number Program data and extract the list of files
6953 included by the source file represented by PST. Build an include
6954 partial symtab for each of these included files. */
6957 dwarf2_build_include_psymtabs (struct dwarf2_cu *cu,
6958 struct die_info *die,
6959 struct partial_symtab *pst)
6962 struct attribute *attr;
6964 attr = dwarf2_attr (die, DW_AT_stmt_list, cu);
6966 lh = dwarf_decode_line_header ((sect_offset) DW_UNSND (attr), cu);
6968 return; /* No linetable, so no includes. */
6970 /* NOTE: pst->dirname is DW_AT_comp_dir (if present). */
6971 dwarf_decode_lines (lh.get (), pst->dirname, cu, pst, pst->textlow, 1);
6975 hash_signatured_type (const void *item)
6977 const struct signatured_type *sig_type
6978 = (const struct signatured_type *) item;
6980 /* This drops the top 32 bits of the signature, but is ok for a hash. */
6981 return sig_type->signature;
6985 eq_signatured_type (const void *item_lhs, const void *item_rhs)
6987 const struct signatured_type *lhs = (const struct signatured_type *) item_lhs;
6988 const struct signatured_type *rhs = (const struct signatured_type *) item_rhs;
6990 return lhs->signature == rhs->signature;
6993 /* Allocate a hash table for signatured types. */
6996 allocate_signatured_type_table (struct objfile *objfile)
6998 return htab_create_alloc_ex (41,
6999 hash_signatured_type,
7002 &objfile->objfile_obstack,
7003 hashtab_obstack_allocate,
7004 dummy_obstack_deallocate);
7007 /* A helper function to add a signatured type CU to a table. */
7010 add_signatured_type_cu_to_table (void **slot, void *datum)
7012 struct signatured_type *sigt = (struct signatured_type *) *slot;
7013 struct signatured_type ***datap = (struct signatured_type ***) datum;
7021 /* A helper for create_debug_types_hash_table. Read types from SECTION
7022 and fill them into TYPES_HTAB. It will process only type units,
7023 therefore DW_UT_type. */
7026 create_debug_type_hash_table (struct dwarf2_per_objfile *dwarf2_per_objfile,
7027 struct dwo_file *dwo_file,
7028 dwarf2_section_info *section, htab_t &types_htab,
7029 rcuh_kind section_kind)
7031 struct objfile *objfile = dwarf2_per_objfile->objfile;
7032 struct dwarf2_section_info *abbrev_section;
7034 const gdb_byte *info_ptr, *end_ptr;
7036 abbrev_section = (dwo_file != NULL
7037 ? &dwo_file->sections.abbrev
7038 : &dwarf2_per_objfile->abbrev);
7040 if (dwarf_read_debug)
7041 fprintf_unfiltered (gdb_stdlog, "Reading %s for %s:\n",
7042 get_section_name (section),
7043 get_section_file_name (abbrev_section));
7045 dwarf2_read_section (objfile, section);
7046 info_ptr = section->buffer;
7048 if (info_ptr == NULL)
7051 /* We can't set abfd until now because the section may be empty or
7052 not present, in which case the bfd is unknown. */
7053 abfd = get_section_bfd_owner (section);
7055 /* We don't use init_cutu_and_read_dies_simple, or some such, here
7056 because we don't need to read any dies: the signature is in the
7059 end_ptr = info_ptr + section->size;
7060 while (info_ptr < end_ptr)
7062 struct signatured_type *sig_type;
7063 struct dwo_unit *dwo_tu;
7065 const gdb_byte *ptr = info_ptr;
7066 struct comp_unit_head header;
7067 unsigned int length;
7069 sect_offset sect_off = (sect_offset) (ptr - section->buffer);
7071 /* Initialize it due to a false compiler warning. */
7072 header.signature = -1;
7073 header.type_cu_offset_in_tu = (cu_offset) -1;
7075 /* We need to read the type's signature in order to build the hash
7076 table, but we don't need anything else just yet. */
7078 ptr = read_and_check_comp_unit_head (dwarf2_per_objfile, &header, section,
7079 abbrev_section, ptr, section_kind);
7081 length = get_cu_length (&header);
7083 /* Skip dummy type units. */
7084 if (ptr >= info_ptr + length
7085 || peek_abbrev_code (abfd, ptr) == 0
7086 || header.unit_type != DW_UT_type)
7092 if (types_htab == NULL)
7095 types_htab = allocate_dwo_unit_table (objfile);
7097 types_htab = allocate_signatured_type_table (objfile);
7103 dwo_tu = OBSTACK_ZALLOC (&objfile->objfile_obstack,
7105 dwo_tu->dwo_file = dwo_file;
7106 dwo_tu->signature = header.signature;
7107 dwo_tu->type_offset_in_tu = header.type_cu_offset_in_tu;
7108 dwo_tu->section = section;
7109 dwo_tu->sect_off = sect_off;
7110 dwo_tu->length = length;
7114 /* N.B.: type_offset is not usable if this type uses a DWO file.
7115 The real type_offset is in the DWO file. */
7117 sig_type = OBSTACK_ZALLOC (&objfile->objfile_obstack,
7118 struct signatured_type);
7119 sig_type->signature = header.signature;
7120 sig_type->type_offset_in_tu = header.type_cu_offset_in_tu;
7121 sig_type->per_cu.dwarf2_per_objfile = dwarf2_per_objfile;
7122 sig_type->per_cu.is_debug_types = 1;
7123 sig_type->per_cu.section = section;
7124 sig_type->per_cu.sect_off = sect_off;
7125 sig_type->per_cu.length = length;
7128 slot = htab_find_slot (types_htab,
7129 dwo_file ? (void*) dwo_tu : (void *) sig_type,
7131 gdb_assert (slot != NULL);
7134 sect_offset dup_sect_off;
7138 const struct dwo_unit *dup_tu
7139 = (const struct dwo_unit *) *slot;
7141 dup_sect_off = dup_tu->sect_off;
7145 const struct signatured_type *dup_tu
7146 = (const struct signatured_type *) *slot;
7148 dup_sect_off = dup_tu->per_cu.sect_off;
7151 complaint (&symfile_complaints,
7152 _("debug type entry at offset %s is duplicate to"
7153 " the entry at offset %s, signature %s"),
7154 sect_offset_str (sect_off), sect_offset_str (dup_sect_off),
7155 hex_string (header.signature));
7157 *slot = dwo_file ? (void *) dwo_tu : (void *) sig_type;
7159 if (dwarf_read_debug > 1)
7160 fprintf_unfiltered (gdb_stdlog, " offset %s, signature %s\n",
7161 sect_offset_str (sect_off),
7162 hex_string (header.signature));
7168 /* Create the hash table of all entries in the .debug_types
7169 (or .debug_types.dwo) section(s).
7170 If reading a DWO file, then DWO_FILE is a pointer to the DWO file object,
7171 otherwise it is NULL.
7173 The result is a pointer to the hash table or NULL if there are no types.
7175 Note: This function processes DWO files only, not DWP files. */
7178 create_debug_types_hash_table (struct dwarf2_per_objfile *dwarf2_per_objfile,
7179 struct dwo_file *dwo_file,
7180 VEC (dwarf2_section_info_def) *types,
7184 struct dwarf2_section_info *section;
7186 if (VEC_empty (dwarf2_section_info_def, types))
7190 VEC_iterate (dwarf2_section_info_def, types, ix, section);
7192 create_debug_type_hash_table (dwarf2_per_objfile, dwo_file, section,
7193 types_htab, rcuh_kind::TYPE);
7196 /* Create the hash table of all entries in the .debug_types section,
7197 and initialize all_type_units.
7198 The result is zero if there is an error (e.g. missing .debug_types section),
7199 otherwise non-zero. */
7202 create_all_type_units (struct dwarf2_per_objfile *dwarf2_per_objfile)
7204 htab_t types_htab = NULL;
7205 struct signatured_type **iter;
7207 create_debug_type_hash_table (dwarf2_per_objfile, NULL,
7208 &dwarf2_per_objfile->info, types_htab,
7209 rcuh_kind::COMPILE);
7210 create_debug_types_hash_table (dwarf2_per_objfile, NULL,
7211 dwarf2_per_objfile->types, types_htab);
7212 if (types_htab == NULL)
7214 dwarf2_per_objfile->signatured_types = NULL;
7218 dwarf2_per_objfile->signatured_types = types_htab;
7220 dwarf2_per_objfile->n_type_units
7221 = dwarf2_per_objfile->n_allocated_type_units
7222 = htab_elements (types_htab);
7223 dwarf2_per_objfile->all_type_units =
7224 XNEWVEC (struct signatured_type *, dwarf2_per_objfile->n_type_units);
7225 iter = &dwarf2_per_objfile->all_type_units[0];
7226 htab_traverse_noresize (types_htab, add_signatured_type_cu_to_table, &iter);
7227 gdb_assert (iter - &dwarf2_per_objfile->all_type_units[0]
7228 == dwarf2_per_objfile->n_type_units);
7233 /* Add an entry for signature SIG to dwarf2_per_objfile->signatured_types.
7234 If SLOT is non-NULL, it is the entry to use in the hash table.
7235 Otherwise we find one. */
7237 static struct signatured_type *
7238 add_type_unit (struct dwarf2_per_objfile *dwarf2_per_objfile, ULONGEST sig,
7241 struct objfile *objfile = dwarf2_per_objfile->objfile;
7242 int n_type_units = dwarf2_per_objfile->n_type_units;
7243 struct signatured_type *sig_type;
7245 gdb_assert (n_type_units <= dwarf2_per_objfile->n_allocated_type_units);
7247 if (n_type_units > dwarf2_per_objfile->n_allocated_type_units)
7249 if (dwarf2_per_objfile->n_allocated_type_units == 0)
7250 dwarf2_per_objfile->n_allocated_type_units = 1;
7251 dwarf2_per_objfile->n_allocated_type_units *= 2;
7252 dwarf2_per_objfile->all_type_units
7253 = XRESIZEVEC (struct signatured_type *,
7254 dwarf2_per_objfile->all_type_units,
7255 dwarf2_per_objfile->n_allocated_type_units);
7256 ++dwarf2_per_objfile->tu_stats.nr_all_type_units_reallocs;
7258 dwarf2_per_objfile->n_type_units = n_type_units;
7260 sig_type = OBSTACK_ZALLOC (&objfile->objfile_obstack,
7261 struct signatured_type);
7262 dwarf2_per_objfile->all_type_units[n_type_units - 1] = sig_type;
7263 sig_type->signature = sig;
7264 sig_type->per_cu.is_debug_types = 1;
7265 if (dwarf2_per_objfile->using_index)
7267 sig_type->per_cu.v.quick =
7268 OBSTACK_ZALLOC (&objfile->objfile_obstack,
7269 struct dwarf2_per_cu_quick_data);
7274 slot = htab_find_slot (dwarf2_per_objfile->signatured_types,
7277 gdb_assert (*slot == NULL);
7279 /* The rest of sig_type must be filled in by the caller. */
7283 /* Subroutine of lookup_dwo_signatured_type and lookup_dwp_signatured_type.
7284 Fill in SIG_ENTRY with DWO_ENTRY. */
7287 fill_in_sig_entry_from_dwo_entry (struct dwarf2_per_objfile *dwarf2_per_objfile,
7288 struct signatured_type *sig_entry,
7289 struct dwo_unit *dwo_entry)
7291 /* Make sure we're not clobbering something we don't expect to. */
7292 gdb_assert (! sig_entry->per_cu.queued);
7293 gdb_assert (sig_entry->per_cu.cu == NULL);
7294 if (dwarf2_per_objfile->using_index)
7296 gdb_assert (sig_entry->per_cu.v.quick != NULL);
7297 gdb_assert (sig_entry->per_cu.v.quick->compunit_symtab == NULL);
7300 gdb_assert (sig_entry->per_cu.v.psymtab == NULL);
7301 gdb_assert (sig_entry->signature == dwo_entry->signature);
7302 gdb_assert (to_underlying (sig_entry->type_offset_in_section) == 0);
7303 gdb_assert (sig_entry->type_unit_group == NULL);
7304 gdb_assert (sig_entry->dwo_unit == NULL);
7306 sig_entry->per_cu.section = dwo_entry->section;
7307 sig_entry->per_cu.sect_off = dwo_entry->sect_off;
7308 sig_entry->per_cu.length = dwo_entry->length;
7309 sig_entry->per_cu.reading_dwo_directly = 1;
7310 sig_entry->per_cu.dwarf2_per_objfile = dwarf2_per_objfile;
7311 sig_entry->type_offset_in_tu = dwo_entry->type_offset_in_tu;
7312 sig_entry->dwo_unit = dwo_entry;
7315 /* Subroutine of lookup_signatured_type.
7316 If we haven't read the TU yet, create the signatured_type data structure
7317 for a TU to be read in directly from a DWO file, bypassing the stub.
7318 This is the "Stay in DWO Optimization": When there is no DWP file and we're
7319 using .gdb_index, then when reading a CU we want to stay in the DWO file
7320 containing that CU. Otherwise we could end up reading several other DWO
7321 files (due to comdat folding) to process the transitive closure of all the
7322 mentioned TUs, and that can be slow. The current DWO file will have every
7323 type signature that it needs.
7324 We only do this for .gdb_index because in the psymtab case we already have
7325 to read all the DWOs to build the type unit groups. */
7327 static struct signatured_type *
7328 lookup_dwo_signatured_type (struct dwarf2_cu *cu, ULONGEST sig)
7330 struct dwarf2_per_objfile *dwarf2_per_objfile
7331 = cu->per_cu->dwarf2_per_objfile;
7332 struct objfile *objfile = dwarf2_per_objfile->objfile;
7333 struct dwo_file *dwo_file;
7334 struct dwo_unit find_dwo_entry, *dwo_entry;
7335 struct signatured_type find_sig_entry, *sig_entry;
7338 gdb_assert (cu->dwo_unit && dwarf2_per_objfile->using_index);
7340 /* If TU skeletons have been removed then we may not have read in any
7342 if (dwarf2_per_objfile->signatured_types == NULL)
7344 dwarf2_per_objfile->signatured_types
7345 = allocate_signatured_type_table (objfile);
7348 /* We only ever need to read in one copy of a signatured type.
7349 Use the global signatured_types array to do our own comdat-folding
7350 of types. If this is the first time we're reading this TU, and
7351 the TU has an entry in .gdb_index, replace the recorded data from
7352 .gdb_index with this TU. */
7354 find_sig_entry.signature = sig;
7355 slot = htab_find_slot (dwarf2_per_objfile->signatured_types,
7356 &find_sig_entry, INSERT);
7357 sig_entry = (struct signatured_type *) *slot;
7359 /* We can get here with the TU already read, *or* in the process of being
7360 read. Don't reassign the global entry to point to this DWO if that's
7361 the case. Also note that if the TU is already being read, it may not
7362 have come from a DWO, the program may be a mix of Fission-compiled
7363 code and non-Fission-compiled code. */
7365 /* Have we already tried to read this TU?
7366 Note: sig_entry can be NULL if the skeleton TU was removed (thus it
7367 needn't exist in the global table yet). */
7368 if (sig_entry != NULL && sig_entry->per_cu.tu_read)
7371 /* Note: cu->dwo_unit is the dwo_unit that references this TU, not the
7372 dwo_unit of the TU itself. */
7373 dwo_file = cu->dwo_unit->dwo_file;
7375 /* Ok, this is the first time we're reading this TU. */
7376 if (dwo_file->tus == NULL)
7378 find_dwo_entry.signature = sig;
7379 dwo_entry = (struct dwo_unit *) htab_find (dwo_file->tus, &find_dwo_entry);
7380 if (dwo_entry == NULL)
7383 /* If the global table doesn't have an entry for this TU, add one. */
7384 if (sig_entry == NULL)
7385 sig_entry = add_type_unit (dwarf2_per_objfile, sig, slot);
7387 fill_in_sig_entry_from_dwo_entry (dwarf2_per_objfile, sig_entry, dwo_entry);
7388 sig_entry->per_cu.tu_read = 1;
7392 /* Subroutine of lookup_signatured_type.
7393 Look up the type for signature SIG, and if we can't find SIG in .gdb_index
7394 then try the DWP file. If the TU stub (skeleton) has been removed then
7395 it won't be in .gdb_index. */
7397 static struct signatured_type *
7398 lookup_dwp_signatured_type (struct dwarf2_cu *cu, ULONGEST sig)
7400 struct dwarf2_per_objfile *dwarf2_per_objfile
7401 = cu->per_cu->dwarf2_per_objfile;
7402 struct objfile *objfile = dwarf2_per_objfile->objfile;
7403 struct dwp_file *dwp_file = get_dwp_file (dwarf2_per_objfile);
7404 struct dwo_unit *dwo_entry;
7405 struct signatured_type find_sig_entry, *sig_entry;
7408 gdb_assert (cu->dwo_unit && dwarf2_per_objfile->using_index);
7409 gdb_assert (dwp_file != NULL);
7411 /* If TU skeletons have been removed then we may not have read in any
7413 if (dwarf2_per_objfile->signatured_types == NULL)
7415 dwarf2_per_objfile->signatured_types
7416 = allocate_signatured_type_table (objfile);
7419 find_sig_entry.signature = sig;
7420 slot = htab_find_slot (dwarf2_per_objfile->signatured_types,
7421 &find_sig_entry, INSERT);
7422 sig_entry = (struct signatured_type *) *slot;
7424 /* Have we already tried to read this TU?
7425 Note: sig_entry can be NULL if the skeleton TU was removed (thus it
7426 needn't exist in the global table yet). */
7427 if (sig_entry != NULL)
7430 if (dwp_file->tus == NULL)
7432 dwo_entry = lookup_dwo_unit_in_dwp (dwarf2_per_objfile, dwp_file, NULL,
7433 sig, 1 /* is_debug_types */);
7434 if (dwo_entry == NULL)
7437 sig_entry = add_type_unit (dwarf2_per_objfile, sig, slot);
7438 fill_in_sig_entry_from_dwo_entry (dwarf2_per_objfile, sig_entry, dwo_entry);
7443 /* Lookup a signature based type for DW_FORM_ref_sig8.
7444 Returns NULL if signature SIG is not present in the table.
7445 It is up to the caller to complain about this. */
7447 static struct signatured_type *
7448 lookup_signatured_type (struct dwarf2_cu *cu, ULONGEST sig)
7450 struct dwarf2_per_objfile *dwarf2_per_objfile
7451 = cu->per_cu->dwarf2_per_objfile;
7454 && dwarf2_per_objfile->using_index)
7456 /* We're in a DWO/DWP file, and we're using .gdb_index.
7457 These cases require special processing. */
7458 if (get_dwp_file (dwarf2_per_objfile) == NULL)
7459 return lookup_dwo_signatured_type (cu, sig);
7461 return lookup_dwp_signatured_type (cu, sig);
7465 struct signatured_type find_entry, *entry;
7467 if (dwarf2_per_objfile->signatured_types == NULL)
7469 find_entry.signature = sig;
7470 entry = ((struct signatured_type *)
7471 htab_find (dwarf2_per_objfile->signatured_types, &find_entry));
7476 /* Low level DIE reading support. */
7478 /* Initialize a die_reader_specs struct from a dwarf2_cu struct. */
7481 init_cu_die_reader (struct die_reader_specs *reader,
7482 struct dwarf2_cu *cu,
7483 struct dwarf2_section_info *section,
7484 struct dwo_file *dwo_file,
7485 struct abbrev_table *abbrev_table)
7487 gdb_assert (section->readin && section->buffer != NULL);
7488 reader->abfd = get_section_bfd_owner (section);
7490 reader->dwo_file = dwo_file;
7491 reader->die_section = section;
7492 reader->buffer = section->buffer;
7493 reader->buffer_end = section->buffer + section->size;
7494 reader->comp_dir = NULL;
7495 reader->abbrev_table = abbrev_table;
7498 /* Subroutine of init_cutu_and_read_dies to simplify it.
7499 Read in the rest of a CU/TU top level DIE from DWO_UNIT.
7500 There's just a lot of work to do, and init_cutu_and_read_dies is big enough
7503 STUB_COMP_UNIT_DIE is for the stub DIE, we copy over certain attributes
7504 from it to the DIE in the DWO. If NULL we are skipping the stub.
7505 STUB_COMP_DIR is similar to STUB_COMP_UNIT_DIE: When reading a TU directly
7506 from the DWO file, bypassing the stub, it contains the DW_AT_comp_dir
7507 attribute of the referencing CU. At most one of STUB_COMP_UNIT_DIE and
7508 STUB_COMP_DIR may be non-NULL.
7509 *RESULT_READER,*RESULT_INFO_PTR,*RESULT_COMP_UNIT_DIE,*RESULT_HAS_CHILDREN
7510 are filled in with the info of the DIE from the DWO file.
7511 *RESULT_DWO_ABBREV_TABLE will be filled in with the abbrev table allocated
7512 from the dwo. Since *RESULT_READER references this abbrev table, it must be
7513 kept around for at least as long as *RESULT_READER.
7515 The result is non-zero if a valid (non-dummy) DIE was found. */
7518 read_cutu_die_from_dwo (struct dwarf2_per_cu_data *this_cu,
7519 struct dwo_unit *dwo_unit,
7520 struct die_info *stub_comp_unit_die,
7521 const char *stub_comp_dir,
7522 struct die_reader_specs *result_reader,
7523 const gdb_byte **result_info_ptr,
7524 struct die_info **result_comp_unit_die,
7525 int *result_has_children,
7526 abbrev_table_up *result_dwo_abbrev_table)
7528 struct dwarf2_per_objfile *dwarf2_per_objfile = this_cu->dwarf2_per_objfile;
7529 struct objfile *objfile = dwarf2_per_objfile->objfile;
7530 struct dwarf2_cu *cu = this_cu->cu;
7532 const gdb_byte *begin_info_ptr, *info_ptr;
7533 struct attribute *comp_dir, *stmt_list, *low_pc, *high_pc, *ranges;
7534 int i,num_extra_attrs;
7535 struct dwarf2_section_info *dwo_abbrev_section;
7536 struct attribute *attr;
7537 struct die_info *comp_unit_die;
7539 /* At most one of these may be provided. */
7540 gdb_assert ((stub_comp_unit_die != NULL) + (stub_comp_dir != NULL) <= 1);
7542 /* These attributes aren't processed until later:
7543 DW_AT_stmt_list, DW_AT_low_pc, DW_AT_high_pc, DW_AT_ranges.
7544 DW_AT_comp_dir is used now, to find the DWO file, but it is also
7545 referenced later. However, these attributes are found in the stub
7546 which we won't have later. In order to not impose this complication
7547 on the rest of the code, we read them here and copy them to the
7556 if (stub_comp_unit_die != NULL)
7558 /* For TUs in DWO files, the DW_AT_stmt_list attribute lives in the
7560 if (! this_cu->is_debug_types)
7561 stmt_list = dwarf2_attr (stub_comp_unit_die, DW_AT_stmt_list, cu);
7562 low_pc = dwarf2_attr (stub_comp_unit_die, DW_AT_low_pc, cu);
7563 high_pc = dwarf2_attr (stub_comp_unit_die, DW_AT_high_pc, cu);
7564 ranges = dwarf2_attr (stub_comp_unit_die, DW_AT_ranges, cu);
7565 comp_dir = dwarf2_attr (stub_comp_unit_die, DW_AT_comp_dir, cu);
7567 /* There should be a DW_AT_addr_base attribute here (if needed).
7568 We need the value before we can process DW_FORM_GNU_addr_index. */
7570 attr = dwarf2_attr (stub_comp_unit_die, DW_AT_GNU_addr_base, cu);
7572 cu->addr_base = DW_UNSND (attr);
7574 /* There should be a DW_AT_ranges_base attribute here (if needed).
7575 We need the value before we can process DW_AT_ranges. */
7576 cu->ranges_base = 0;
7577 attr = dwarf2_attr (stub_comp_unit_die, DW_AT_GNU_ranges_base, cu);
7579 cu->ranges_base = DW_UNSND (attr);
7581 else if (stub_comp_dir != NULL)
7583 /* Reconstruct the comp_dir attribute to simplify the code below. */
7584 comp_dir = XOBNEW (&cu->comp_unit_obstack, struct attribute);
7585 comp_dir->name = DW_AT_comp_dir;
7586 comp_dir->form = DW_FORM_string;
7587 DW_STRING_IS_CANONICAL (comp_dir) = 0;
7588 DW_STRING (comp_dir) = stub_comp_dir;
7591 /* Set up for reading the DWO CU/TU. */
7592 cu->dwo_unit = dwo_unit;
7593 dwarf2_section_info *section = dwo_unit->section;
7594 dwarf2_read_section (objfile, section);
7595 abfd = get_section_bfd_owner (section);
7596 begin_info_ptr = info_ptr = (section->buffer
7597 + to_underlying (dwo_unit->sect_off));
7598 dwo_abbrev_section = &dwo_unit->dwo_file->sections.abbrev;
7600 if (this_cu->is_debug_types)
7602 struct signatured_type *sig_type = (struct signatured_type *) this_cu;
7604 info_ptr = read_and_check_comp_unit_head (dwarf2_per_objfile,
7605 &cu->header, section,
7607 info_ptr, rcuh_kind::TYPE);
7608 /* This is not an assert because it can be caused by bad debug info. */
7609 if (sig_type->signature != cu->header.signature)
7611 error (_("Dwarf Error: signature mismatch %s vs %s while reading"
7612 " TU at offset %s [in module %s]"),
7613 hex_string (sig_type->signature),
7614 hex_string (cu->header.signature),
7615 sect_offset_str (dwo_unit->sect_off),
7616 bfd_get_filename (abfd));
7618 gdb_assert (dwo_unit->sect_off == cu->header.sect_off);
7619 /* For DWOs coming from DWP files, we don't know the CU length
7620 nor the type's offset in the TU until now. */
7621 dwo_unit->length = get_cu_length (&cu->header);
7622 dwo_unit->type_offset_in_tu = cu->header.type_cu_offset_in_tu;
7624 /* Establish the type offset that can be used to lookup the type.
7625 For DWO files, we don't know it until now. */
7626 sig_type->type_offset_in_section
7627 = dwo_unit->sect_off + to_underlying (dwo_unit->type_offset_in_tu);
7631 info_ptr = read_and_check_comp_unit_head (dwarf2_per_objfile,
7632 &cu->header, section,
7634 info_ptr, rcuh_kind::COMPILE);
7635 gdb_assert (dwo_unit->sect_off == cu->header.sect_off);
7636 /* For DWOs coming from DWP files, we don't know the CU length
7638 dwo_unit->length = get_cu_length (&cu->header);
7641 *result_dwo_abbrev_table
7642 = abbrev_table_read_table (dwarf2_per_objfile, dwo_abbrev_section,
7643 cu->header.abbrev_sect_off);
7644 init_cu_die_reader (result_reader, cu, section, dwo_unit->dwo_file,
7645 result_dwo_abbrev_table->get ());
7647 /* Read in the die, but leave space to copy over the attributes
7648 from the stub. This has the benefit of simplifying the rest of
7649 the code - all the work to maintain the illusion of a single
7650 DW_TAG_{compile,type}_unit DIE is done here. */
7651 num_extra_attrs = ((stmt_list != NULL)
7655 + (comp_dir != NULL));
7656 info_ptr = read_full_die_1 (result_reader, result_comp_unit_die, info_ptr,
7657 result_has_children, num_extra_attrs);
7659 /* Copy over the attributes from the stub to the DIE we just read in. */
7660 comp_unit_die = *result_comp_unit_die;
7661 i = comp_unit_die->num_attrs;
7662 if (stmt_list != NULL)
7663 comp_unit_die->attrs[i++] = *stmt_list;
7665 comp_unit_die->attrs[i++] = *low_pc;
7666 if (high_pc != NULL)
7667 comp_unit_die->attrs[i++] = *high_pc;
7669 comp_unit_die->attrs[i++] = *ranges;
7670 if (comp_dir != NULL)
7671 comp_unit_die->attrs[i++] = *comp_dir;
7672 comp_unit_die->num_attrs += num_extra_attrs;
7674 if (dwarf_die_debug)
7676 fprintf_unfiltered (gdb_stdlog,
7677 "Read die from %s@0x%x of %s:\n",
7678 get_section_name (section),
7679 (unsigned) (begin_info_ptr - section->buffer),
7680 bfd_get_filename (abfd));
7681 dump_die (comp_unit_die, dwarf_die_debug);
7684 /* Save the comp_dir attribute. If there is no DWP file then we'll read
7685 TUs by skipping the stub and going directly to the entry in the DWO file.
7686 However, skipping the stub means we won't get DW_AT_comp_dir, so we have
7687 to get it via circuitous means. Blech. */
7688 if (comp_dir != NULL)
7689 result_reader->comp_dir = DW_STRING (comp_dir);
7691 /* Skip dummy compilation units. */
7692 if (info_ptr >= begin_info_ptr + dwo_unit->length
7693 || peek_abbrev_code (abfd, info_ptr) == 0)
7696 *result_info_ptr = info_ptr;
7700 /* Subroutine of init_cutu_and_read_dies to simplify it.
7701 Look up the DWO unit specified by COMP_UNIT_DIE of THIS_CU.
7702 Returns NULL if the specified DWO unit cannot be found. */
7704 static struct dwo_unit *
7705 lookup_dwo_unit (struct dwarf2_per_cu_data *this_cu,
7706 struct die_info *comp_unit_die)
7708 struct dwarf2_cu *cu = this_cu->cu;
7710 struct dwo_unit *dwo_unit;
7711 const char *comp_dir, *dwo_name;
7713 gdb_assert (cu != NULL);
7715 /* Yeah, we look dwo_name up again, but it simplifies the code. */
7716 dwo_name = dwarf2_string_attr (comp_unit_die, DW_AT_GNU_dwo_name, cu);
7717 comp_dir = dwarf2_string_attr (comp_unit_die, DW_AT_comp_dir, cu);
7719 if (this_cu->is_debug_types)
7721 struct signatured_type *sig_type;
7723 /* Since this_cu is the first member of struct signatured_type,
7724 we can go from a pointer to one to a pointer to the other. */
7725 sig_type = (struct signatured_type *) this_cu;
7726 signature = sig_type->signature;
7727 dwo_unit = lookup_dwo_type_unit (sig_type, dwo_name, comp_dir);
7731 struct attribute *attr;
7733 attr = dwarf2_attr (comp_unit_die, DW_AT_GNU_dwo_id, cu);
7735 error (_("Dwarf Error: missing dwo_id for dwo_name %s"
7737 dwo_name, objfile_name (this_cu->dwarf2_per_objfile->objfile));
7738 signature = DW_UNSND (attr);
7739 dwo_unit = lookup_dwo_comp_unit (this_cu, dwo_name, comp_dir,
7746 /* Subroutine of init_cutu_and_read_dies to simplify it.
7747 See it for a description of the parameters.
7748 Read a TU directly from a DWO file, bypassing the stub. */
7751 init_tu_and_read_dwo_dies (struct dwarf2_per_cu_data *this_cu,
7752 int use_existing_cu, int keep,
7753 die_reader_func_ftype *die_reader_func,
7756 std::unique_ptr<dwarf2_cu> new_cu;
7757 struct signatured_type *sig_type;
7758 struct die_reader_specs reader;
7759 const gdb_byte *info_ptr;
7760 struct die_info *comp_unit_die;
7762 struct dwarf2_per_objfile *dwarf2_per_objfile = this_cu->dwarf2_per_objfile;
7764 /* Verify we can do the following downcast, and that we have the
7766 gdb_assert (this_cu->is_debug_types && this_cu->reading_dwo_directly);
7767 sig_type = (struct signatured_type *) this_cu;
7768 gdb_assert (sig_type->dwo_unit != NULL);
7770 if (use_existing_cu && this_cu->cu != NULL)
7772 gdb_assert (this_cu->cu->dwo_unit == sig_type->dwo_unit);
7773 /* There's no need to do the rereading_dwo_cu handling that
7774 init_cutu_and_read_dies does since we don't read the stub. */
7778 /* If !use_existing_cu, this_cu->cu must be NULL. */
7779 gdb_assert (this_cu->cu == NULL);
7780 new_cu.reset (new dwarf2_cu (this_cu));
7783 /* A future optimization, if needed, would be to use an existing
7784 abbrev table. When reading DWOs with skeletonless TUs, all the TUs
7785 could share abbrev tables. */
7787 /* The abbreviation table used by READER, this must live at least as long as
7789 abbrev_table_up dwo_abbrev_table;
7791 if (read_cutu_die_from_dwo (this_cu, sig_type->dwo_unit,
7792 NULL /* stub_comp_unit_die */,
7793 sig_type->dwo_unit->dwo_file->comp_dir,
7795 &comp_unit_die, &has_children,
7796 &dwo_abbrev_table) == 0)
7802 /* All the "real" work is done here. */
7803 die_reader_func (&reader, info_ptr, comp_unit_die, has_children, data);
7805 /* This duplicates the code in init_cutu_and_read_dies,
7806 but the alternative is making the latter more complex.
7807 This function is only for the special case of using DWO files directly:
7808 no point in overly complicating the general case just to handle this. */
7809 if (new_cu != NULL && keep)
7811 /* Link this CU into read_in_chain. */
7812 this_cu->cu->read_in_chain = dwarf2_per_objfile->read_in_chain;
7813 dwarf2_per_objfile->read_in_chain = this_cu;
7814 /* The chain owns it now. */
7819 /* Initialize a CU (or TU) and read its DIEs.
7820 If the CU defers to a DWO file, read the DWO file as well.
7822 ABBREV_TABLE, if non-NULL, is the abbreviation table to use.
7823 Otherwise the table specified in the comp unit header is read in and used.
7824 This is an optimization for when we already have the abbrev table.
7826 If USE_EXISTING_CU is non-zero, and THIS_CU->cu is non-NULL, then use it.
7827 Otherwise, a new CU is allocated with xmalloc.
7829 If KEEP is non-zero, then if we allocated a dwarf2_cu we add it to
7830 read_in_chain. Otherwise the dwarf2_cu data is freed at the end.
7832 WARNING: If THIS_CU is a "dummy CU" (used as filler by the incremental
7833 linker) then DIE_READER_FUNC will not get called. */
7836 init_cutu_and_read_dies (struct dwarf2_per_cu_data *this_cu,
7837 struct abbrev_table *abbrev_table,
7838 int use_existing_cu, int keep,
7839 die_reader_func_ftype *die_reader_func,
7842 struct dwarf2_per_objfile *dwarf2_per_objfile = this_cu->dwarf2_per_objfile;
7843 struct objfile *objfile = dwarf2_per_objfile->objfile;
7844 struct dwarf2_section_info *section = this_cu->section;
7845 bfd *abfd = get_section_bfd_owner (section);
7846 struct dwarf2_cu *cu;
7847 const gdb_byte *begin_info_ptr, *info_ptr;
7848 struct die_reader_specs reader;
7849 struct die_info *comp_unit_die;
7851 struct attribute *attr;
7852 struct signatured_type *sig_type = NULL;
7853 struct dwarf2_section_info *abbrev_section;
7854 /* Non-zero if CU currently points to a DWO file and we need to
7855 reread it. When this happens we need to reread the skeleton die
7856 before we can reread the DWO file (this only applies to CUs, not TUs). */
7857 int rereading_dwo_cu = 0;
7859 if (dwarf_die_debug)
7860 fprintf_unfiltered (gdb_stdlog, "Reading %s unit at offset %s\n",
7861 this_cu->is_debug_types ? "type" : "comp",
7862 sect_offset_str (this_cu->sect_off));
7864 if (use_existing_cu)
7867 /* If we're reading a TU directly from a DWO file, including a virtual DWO
7868 file (instead of going through the stub), short-circuit all of this. */
7869 if (this_cu->reading_dwo_directly)
7871 /* Narrow down the scope of possibilities to have to understand. */
7872 gdb_assert (this_cu->is_debug_types);
7873 gdb_assert (abbrev_table == NULL);
7874 init_tu_and_read_dwo_dies (this_cu, use_existing_cu, keep,
7875 die_reader_func, data);
7879 /* This is cheap if the section is already read in. */
7880 dwarf2_read_section (objfile, section);
7882 begin_info_ptr = info_ptr = section->buffer + to_underlying (this_cu->sect_off);
7884 abbrev_section = get_abbrev_section_for_cu (this_cu);
7886 std::unique_ptr<dwarf2_cu> new_cu;
7887 if (use_existing_cu && this_cu->cu != NULL)
7890 /* If this CU is from a DWO file we need to start over, we need to
7891 refetch the attributes from the skeleton CU.
7892 This could be optimized by retrieving those attributes from when we
7893 were here the first time: the previous comp_unit_die was stored in
7894 comp_unit_obstack. But there's no data yet that we need this
7896 if (cu->dwo_unit != NULL)
7897 rereading_dwo_cu = 1;
7901 /* If !use_existing_cu, this_cu->cu must be NULL. */
7902 gdb_assert (this_cu->cu == NULL);
7903 new_cu.reset (new dwarf2_cu (this_cu));
7907 /* Get the header. */
7908 if (to_underlying (cu->header.first_die_cu_offset) != 0 && !rereading_dwo_cu)
7910 /* We already have the header, there's no need to read it in again. */
7911 info_ptr += to_underlying (cu->header.first_die_cu_offset);
7915 if (this_cu->is_debug_types)
7917 info_ptr = read_and_check_comp_unit_head (dwarf2_per_objfile,
7918 &cu->header, section,
7919 abbrev_section, info_ptr,
7922 /* Since per_cu is the first member of struct signatured_type,
7923 we can go from a pointer to one to a pointer to the other. */
7924 sig_type = (struct signatured_type *) this_cu;
7925 gdb_assert (sig_type->signature == cu->header.signature);
7926 gdb_assert (sig_type->type_offset_in_tu
7927 == cu->header.type_cu_offset_in_tu);
7928 gdb_assert (this_cu->sect_off == cu->header.sect_off);
7930 /* LENGTH has not been set yet for type units if we're
7931 using .gdb_index. */
7932 this_cu->length = get_cu_length (&cu->header);
7934 /* Establish the type offset that can be used to lookup the type. */
7935 sig_type->type_offset_in_section =
7936 this_cu->sect_off + to_underlying (sig_type->type_offset_in_tu);
7938 this_cu->dwarf_version = cu->header.version;
7942 info_ptr = read_and_check_comp_unit_head (dwarf2_per_objfile,
7943 &cu->header, section,
7946 rcuh_kind::COMPILE);
7948 gdb_assert (this_cu->sect_off == cu->header.sect_off);
7949 gdb_assert (this_cu->length == get_cu_length (&cu->header));
7950 this_cu->dwarf_version = cu->header.version;
7954 /* Skip dummy compilation units. */
7955 if (info_ptr >= begin_info_ptr + this_cu->length
7956 || peek_abbrev_code (abfd, info_ptr) == 0)
7959 /* If we don't have them yet, read the abbrevs for this compilation unit.
7960 And if we need to read them now, make sure they're freed when we're
7961 done (own the table through ABBREV_TABLE_HOLDER). */
7962 abbrev_table_up abbrev_table_holder;
7963 if (abbrev_table != NULL)
7964 gdb_assert (cu->header.abbrev_sect_off == abbrev_table->sect_off);
7968 = abbrev_table_read_table (dwarf2_per_objfile, abbrev_section,
7969 cu->header.abbrev_sect_off);
7970 abbrev_table = abbrev_table_holder.get ();
7973 /* Read the top level CU/TU die. */
7974 init_cu_die_reader (&reader, cu, section, NULL, abbrev_table);
7975 info_ptr = read_full_die (&reader, &comp_unit_die, info_ptr, &has_children);
7977 /* If we are in a DWO stub, process it and then read in the "real" CU/TU
7978 from the DWO file. read_cutu_die_from_dwo will allocate the abbreviation
7979 table from the DWO file and pass the ownership over to us. It will be
7980 referenced from READER, so we must make sure to free it after we're done
7983 Note that if USE_EXISTING_OK != 0, and THIS_CU->cu already contains a
7984 DWO CU, that this test will fail (the attribute will not be present). */
7985 attr = dwarf2_attr (comp_unit_die, DW_AT_GNU_dwo_name, cu);
7986 abbrev_table_up dwo_abbrev_table;
7989 struct dwo_unit *dwo_unit;
7990 struct die_info *dwo_comp_unit_die;
7994 complaint (&symfile_complaints,
7995 _("compilation unit with DW_AT_GNU_dwo_name"
7996 " has children (offset %s) [in module %s]"),
7997 sect_offset_str (this_cu->sect_off),
7998 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 %s\n",
8072 this_cu->is_debug_types ? "type" : "comp",
8073 sect_offset_str (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 @%s: %s - %s"
8445 ", %d global, %d static syms\n",
8446 per_cu->is_debug_types ? "type" : "comp",
8447 sect_offset_str (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 %s"),
9224 parent->tag, sect_offset_str (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 %s [in module %s]"),
9622 abbrev_number, cu->per_cu->is_debug_types ? "TU" : "CU",
9623 sect_offset_str (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 %s",
9961 hex_string (sig_type->signature),
9962 sect_offset_str (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 %s",
9970 sect_offset_str (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 %s [in module %s]"),
11193 physname, canon, mangled, sect_offset_str (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 %s has too many recursively imported "
11256 "declarations"), sect_offset_str (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 %s [in module %s]"),
11400 sect_offset_str (child_die->sect_off),
11401 objfile_name (objfile));
11405 import_attr = dwarf2_attr (child_die, DW_AT_import, cu);
11406 if (import_attr == NULL)
11408 complaint (&symfile_complaints, _("Tag '%s' has no DW_AT_import"),
11409 dwarf_tag_name (child_die->tag));
11414 imported_die = follow_die_ref_or_sig (child_die, import_attr,
11416 imported_name = dwarf2_name (imported_die, imported_cu);
11417 if (imported_name == NULL)
11419 complaint (&symfile_complaints,
11420 _("child DW_TAG_imported_declaration has unknown "
11421 "imported name - DIE at %s [in module %s]"),
11422 sect_offset_str (child_die->sect_off),
11423 objfile_name (objfile));
11427 excludes.push_back (imported_name);
11429 process_die (child_die, cu);
11432 add_using_directive (using_directives (cu->language),
11436 imported_declaration,
11439 &objfile->objfile_obstack);
11442 /* ICC<14 does not output the required DW_AT_declaration on incomplete
11443 types, but gives them a size of zero. Starting with version 14,
11444 ICC is compatible with GCC. */
11447 producer_is_icc_lt_14 (struct dwarf2_cu *cu)
11449 if (!cu->checked_producer)
11450 check_producer (cu);
11452 return cu->producer_is_icc_lt_14;
11455 /* Check for possibly missing DW_AT_comp_dir with relative .debug_line
11456 directory paths. GCC SVN r127613 (new option -fdebug-prefix-map) fixed
11457 this, it was first present in GCC release 4.3.0. */
11460 producer_is_gcc_lt_4_3 (struct dwarf2_cu *cu)
11462 if (!cu->checked_producer)
11463 check_producer (cu);
11465 return cu->producer_is_gcc_lt_4_3;
11468 static file_and_directory
11469 find_file_and_directory (struct die_info *die, struct dwarf2_cu *cu)
11471 file_and_directory res;
11473 /* Find the filename. Do not use dwarf2_name here, since the filename
11474 is not a source language identifier. */
11475 res.name = dwarf2_string_attr (die, DW_AT_name, cu);
11476 res.comp_dir = dwarf2_string_attr (die, DW_AT_comp_dir, cu);
11478 if (res.comp_dir == NULL
11479 && producer_is_gcc_lt_4_3 (cu) && res.name != NULL
11480 && IS_ABSOLUTE_PATH (res.name))
11482 res.comp_dir_storage = ldirname (res.name);
11483 if (!res.comp_dir_storage.empty ())
11484 res.comp_dir = res.comp_dir_storage.c_str ();
11486 if (res.comp_dir != NULL)
11488 /* Irix 6.2 native cc prepends <machine>.: to the compilation
11489 directory, get rid of it. */
11490 const char *cp = strchr (res.comp_dir, ':');
11492 if (cp && cp != res.comp_dir && cp[-1] == '.' && cp[1] == '/')
11493 res.comp_dir = cp + 1;
11496 if (res.name == NULL)
11497 res.name = "<unknown>";
11502 /* Handle DW_AT_stmt_list for a compilation unit.
11503 DIE is the DW_TAG_compile_unit die for CU.
11504 COMP_DIR is the compilation directory. LOWPC is passed to
11505 dwarf_decode_lines. See dwarf_decode_lines comments about it. */
11508 handle_DW_AT_stmt_list (struct die_info *die, struct dwarf2_cu *cu,
11509 const char *comp_dir, CORE_ADDR lowpc) /* ARI: editCase function */
11511 struct dwarf2_per_objfile *dwarf2_per_objfile
11512 = cu->per_cu->dwarf2_per_objfile;
11513 struct objfile *objfile = dwarf2_per_objfile->objfile;
11514 struct attribute *attr;
11515 struct line_header line_header_local;
11516 hashval_t line_header_local_hash;
11518 int decode_mapping;
11520 gdb_assert (! cu->per_cu->is_debug_types);
11522 attr = dwarf2_attr (die, DW_AT_stmt_list, cu);
11526 sect_offset line_offset = (sect_offset) DW_UNSND (attr);
11528 /* The line header hash table is only created if needed (it exists to
11529 prevent redundant reading of the line table for partial_units).
11530 If we're given a partial_unit, we'll need it. If we're given a
11531 compile_unit, then use the line header hash table if it's already
11532 created, but don't create one just yet. */
11534 if (dwarf2_per_objfile->line_header_hash == NULL
11535 && die->tag == DW_TAG_partial_unit)
11537 dwarf2_per_objfile->line_header_hash
11538 = htab_create_alloc_ex (127, line_header_hash_voidp,
11539 line_header_eq_voidp,
11540 free_line_header_voidp,
11541 &objfile->objfile_obstack,
11542 hashtab_obstack_allocate,
11543 dummy_obstack_deallocate);
11546 line_header_local.sect_off = line_offset;
11547 line_header_local.offset_in_dwz = cu->per_cu->is_dwz;
11548 line_header_local_hash = line_header_hash (&line_header_local);
11549 if (dwarf2_per_objfile->line_header_hash != NULL)
11551 slot = htab_find_slot_with_hash (dwarf2_per_objfile->line_header_hash,
11552 &line_header_local,
11553 line_header_local_hash, NO_INSERT);
11555 /* For DW_TAG_compile_unit we need info like symtab::linetable which
11556 is not present in *SLOT (since if there is something in *SLOT then
11557 it will be for a partial_unit). */
11558 if (die->tag == DW_TAG_partial_unit && slot != NULL)
11560 gdb_assert (*slot != NULL);
11561 cu->line_header = (struct line_header *) *slot;
11566 /* dwarf_decode_line_header does not yet provide sufficient information.
11567 We always have to call also dwarf_decode_lines for it. */
11568 line_header_up lh = dwarf_decode_line_header (line_offset, cu);
11572 cu->line_header = lh.release ();
11573 cu->line_header_die_owner = die;
11575 if (dwarf2_per_objfile->line_header_hash == NULL)
11579 slot = htab_find_slot_with_hash (dwarf2_per_objfile->line_header_hash,
11580 &line_header_local,
11581 line_header_local_hash, INSERT);
11582 gdb_assert (slot != NULL);
11584 if (slot != NULL && *slot == NULL)
11586 /* This newly decoded line number information unit will be owned
11587 by line_header_hash hash table. */
11588 *slot = cu->line_header;
11589 cu->line_header_die_owner = NULL;
11593 /* We cannot free any current entry in (*slot) as that struct line_header
11594 may be already used by multiple CUs. Create only temporary decoded
11595 line_header for this CU - it may happen at most once for each line
11596 number information unit. And if we're not using line_header_hash
11597 then this is what we want as well. */
11598 gdb_assert (die->tag != DW_TAG_partial_unit);
11600 decode_mapping = (die->tag != DW_TAG_partial_unit);
11601 dwarf_decode_lines (cu->line_header, comp_dir, cu, NULL, lowpc,
11606 /* Process DW_TAG_compile_unit or DW_TAG_partial_unit. */
11609 read_file_scope (struct die_info *die, struct dwarf2_cu *cu)
11611 struct dwarf2_per_objfile *dwarf2_per_objfile
11612 = cu->per_cu->dwarf2_per_objfile;
11613 struct objfile *objfile = dwarf2_per_objfile->objfile;
11614 struct gdbarch *gdbarch = get_objfile_arch (objfile);
11615 CORE_ADDR lowpc = ((CORE_ADDR) -1);
11616 CORE_ADDR highpc = ((CORE_ADDR) 0);
11617 struct attribute *attr;
11618 struct die_info *child_die;
11619 CORE_ADDR baseaddr;
11621 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
11623 get_scope_pc_bounds (die, &lowpc, &highpc, cu);
11625 /* If we didn't find a lowpc, set it to highpc to avoid complaints
11626 from finish_block. */
11627 if (lowpc == ((CORE_ADDR) -1))
11629 lowpc = gdbarch_adjust_dwarf2_addr (gdbarch, lowpc + baseaddr);
11631 file_and_directory fnd = find_file_and_directory (die, cu);
11633 prepare_one_comp_unit (cu, die, cu->language);
11635 /* The XLCL doesn't generate DW_LANG_OpenCL because this attribute is not
11636 standardised yet. As a workaround for the language detection we fall
11637 back to the DW_AT_producer string. */
11638 if (cu->producer && strstr (cu->producer, "IBM XL C for OpenCL") != NULL)
11639 cu->language = language_opencl;
11641 /* Similar hack for Go. */
11642 if (cu->producer && strstr (cu->producer, "GNU Go ") != NULL)
11643 set_cu_language (DW_LANG_Go, cu);
11645 dwarf2_start_symtab (cu, fnd.name, fnd.comp_dir, lowpc);
11647 /* Decode line number information if present. We do this before
11648 processing child DIEs, so that the line header table is available
11649 for DW_AT_decl_file. */
11650 handle_DW_AT_stmt_list (die, cu, fnd.comp_dir, lowpc);
11652 /* Process all dies in compilation unit. */
11653 if (die->child != NULL)
11655 child_die = die->child;
11656 while (child_die && child_die->tag)
11658 process_die (child_die, cu);
11659 child_die = sibling_die (child_die);
11663 /* Decode macro information, if present. Dwarf 2 macro information
11664 refers to information in the line number info statement program
11665 header, so we can only read it if we've read the header
11667 attr = dwarf2_attr (die, DW_AT_macros, cu);
11669 attr = dwarf2_attr (die, DW_AT_GNU_macros, cu);
11670 if (attr && cu->line_header)
11672 if (dwarf2_attr (die, DW_AT_macro_info, cu))
11673 complaint (&symfile_complaints,
11674 _("CU refers to both DW_AT_macros and DW_AT_macro_info"));
11676 dwarf_decode_macros (cu, DW_UNSND (attr), 1);
11680 attr = dwarf2_attr (die, DW_AT_macro_info, cu);
11681 if (attr && cu->line_header)
11683 unsigned int macro_offset = DW_UNSND (attr);
11685 dwarf_decode_macros (cu, macro_offset, 0);
11690 /* TU version of handle_DW_AT_stmt_list for read_type_unit_scope.
11691 Create the set of symtabs used by this TU, or if this TU is sharing
11692 symtabs with another TU and the symtabs have already been created
11693 then restore those symtabs in the line header.
11694 We don't need the pc/line-number mapping for type units. */
11697 setup_type_unit_groups (struct die_info *die, struct dwarf2_cu *cu)
11699 struct dwarf2_per_cu_data *per_cu = cu->per_cu;
11700 struct type_unit_group *tu_group;
11702 struct attribute *attr;
11704 struct signatured_type *sig_type;
11706 gdb_assert (per_cu->is_debug_types);
11707 sig_type = (struct signatured_type *) per_cu;
11709 attr = dwarf2_attr (die, DW_AT_stmt_list, cu);
11711 /* If we're using .gdb_index (includes -readnow) then
11712 per_cu->type_unit_group may not have been set up yet. */
11713 if (sig_type->type_unit_group == NULL)
11714 sig_type->type_unit_group = get_type_unit_group (cu, attr);
11715 tu_group = sig_type->type_unit_group;
11717 /* If we've already processed this stmt_list there's no real need to
11718 do it again, we could fake it and just recreate the part we need
11719 (file name,index -> symtab mapping). If data shows this optimization
11720 is useful we can do it then. */
11721 first_time = tu_group->compunit_symtab == NULL;
11723 /* We have to handle the case of both a missing DW_AT_stmt_list or bad
11728 sect_offset line_offset = (sect_offset) DW_UNSND (attr);
11729 lh = dwarf_decode_line_header (line_offset, cu);
11734 dwarf2_start_symtab (cu, "", NULL, 0);
11737 gdb_assert (tu_group->symtabs == NULL);
11738 restart_symtab (tu_group->compunit_symtab, "", 0);
11743 cu->line_header = lh.release ();
11744 cu->line_header_die_owner = die;
11748 struct compunit_symtab *cust = dwarf2_start_symtab (cu, "", NULL, 0);
11750 /* Note: We don't assign tu_group->compunit_symtab yet because we're
11751 still initializing it, and our caller (a few levels up)
11752 process_full_type_unit still needs to know if this is the first
11755 tu_group->num_symtabs = cu->line_header->file_names.size ();
11756 tu_group->symtabs = XNEWVEC (struct symtab *,
11757 cu->line_header->file_names.size ());
11759 for (i = 0; i < cu->line_header->file_names.size (); ++i)
11761 file_entry &fe = cu->line_header->file_names[i];
11763 dwarf2_start_subfile (fe.name, fe.include_dir (cu->line_header));
11765 if (current_subfile->symtab == NULL)
11767 /* NOTE: start_subfile will recognize when it's been
11768 passed a file it has already seen. So we can't
11769 assume there's a simple mapping from
11770 cu->line_header->file_names to subfiles, plus
11771 cu->line_header->file_names may contain dups. */
11772 current_subfile->symtab
11773 = allocate_symtab (cust, current_subfile->name);
11776 fe.symtab = current_subfile->symtab;
11777 tu_group->symtabs[i] = fe.symtab;
11782 restart_symtab (tu_group->compunit_symtab, "", 0);
11784 for (i = 0; i < cu->line_header->file_names.size (); ++i)
11786 file_entry &fe = cu->line_header->file_names[i];
11788 fe.symtab = tu_group->symtabs[i];
11792 /* The main symtab is allocated last. Type units don't have DW_AT_name
11793 so they don't have a "real" (so to speak) symtab anyway.
11794 There is later code that will assign the main symtab to all symbols
11795 that don't have one. We need to handle the case of a symbol with a
11796 missing symtab (DW_AT_decl_file) anyway. */
11799 /* Process DW_TAG_type_unit.
11800 For TUs we want to skip the first top level sibling if it's not the
11801 actual type being defined by this TU. In this case the first top
11802 level sibling is there to provide context only. */
11805 read_type_unit_scope (struct die_info *die, struct dwarf2_cu *cu)
11807 struct die_info *child_die;
11809 prepare_one_comp_unit (cu, die, language_minimal);
11811 /* Initialize (or reinitialize) the machinery for building symtabs.
11812 We do this before processing child DIEs, so that the line header table
11813 is available for DW_AT_decl_file. */
11814 setup_type_unit_groups (die, cu);
11816 if (die->child != NULL)
11818 child_die = die->child;
11819 while (child_die && child_die->tag)
11821 process_die (child_die, cu);
11822 child_die = sibling_die (child_die);
11829 http://gcc.gnu.org/wiki/DebugFission
11830 http://gcc.gnu.org/wiki/DebugFissionDWP
11832 To simplify handling of both DWO files ("object" files with the DWARF info)
11833 and DWP files (a file with the DWOs packaged up into one file), we treat
11834 DWP files as having a collection of virtual DWO files. */
11837 hash_dwo_file (const void *item)
11839 const struct dwo_file *dwo_file = (const struct dwo_file *) item;
11842 hash = htab_hash_string (dwo_file->dwo_name);
11843 if (dwo_file->comp_dir != NULL)
11844 hash += htab_hash_string (dwo_file->comp_dir);
11849 eq_dwo_file (const void *item_lhs, const void *item_rhs)
11851 const struct dwo_file *lhs = (const struct dwo_file *) item_lhs;
11852 const struct dwo_file *rhs = (const struct dwo_file *) item_rhs;
11854 if (strcmp (lhs->dwo_name, rhs->dwo_name) != 0)
11856 if (lhs->comp_dir == NULL || rhs->comp_dir == NULL)
11857 return lhs->comp_dir == rhs->comp_dir;
11858 return strcmp (lhs->comp_dir, rhs->comp_dir) == 0;
11861 /* Allocate a hash table for DWO files. */
11864 allocate_dwo_file_hash_table (struct objfile *objfile)
11866 return htab_create_alloc_ex (41,
11870 &objfile->objfile_obstack,
11871 hashtab_obstack_allocate,
11872 dummy_obstack_deallocate);
11875 /* Lookup DWO file DWO_NAME. */
11878 lookup_dwo_file_slot (struct dwarf2_per_objfile *dwarf2_per_objfile,
11879 const char *dwo_name,
11880 const char *comp_dir)
11882 struct dwo_file find_entry;
11885 if (dwarf2_per_objfile->dwo_files == NULL)
11886 dwarf2_per_objfile->dwo_files
11887 = allocate_dwo_file_hash_table (dwarf2_per_objfile->objfile);
11889 memset (&find_entry, 0, sizeof (find_entry));
11890 find_entry.dwo_name = dwo_name;
11891 find_entry.comp_dir = comp_dir;
11892 slot = htab_find_slot (dwarf2_per_objfile->dwo_files, &find_entry, INSERT);
11898 hash_dwo_unit (const void *item)
11900 const struct dwo_unit *dwo_unit = (const struct dwo_unit *) item;
11902 /* This drops the top 32 bits of the id, but is ok for a hash. */
11903 return dwo_unit->signature;
11907 eq_dwo_unit (const void *item_lhs, const void *item_rhs)
11909 const struct dwo_unit *lhs = (const struct dwo_unit *) item_lhs;
11910 const struct dwo_unit *rhs = (const struct dwo_unit *) item_rhs;
11912 /* The signature is assumed to be unique within the DWO file.
11913 So while object file CU dwo_id's always have the value zero,
11914 that's OK, assuming each object file DWO file has only one CU,
11915 and that's the rule for now. */
11916 return lhs->signature == rhs->signature;
11919 /* Allocate a hash table for DWO CUs,TUs.
11920 There is one of these tables for each of CUs,TUs for each DWO file. */
11923 allocate_dwo_unit_table (struct objfile *objfile)
11925 /* Start out with a pretty small number.
11926 Generally DWO files contain only one CU and maybe some TUs. */
11927 return htab_create_alloc_ex (3,
11931 &objfile->objfile_obstack,
11932 hashtab_obstack_allocate,
11933 dummy_obstack_deallocate);
11936 /* Structure used to pass data to create_dwo_debug_info_hash_table_reader. */
11938 struct create_dwo_cu_data
11940 struct dwo_file *dwo_file;
11941 struct dwo_unit dwo_unit;
11944 /* die_reader_func for create_dwo_cu. */
11947 create_dwo_cu_reader (const struct die_reader_specs *reader,
11948 const gdb_byte *info_ptr,
11949 struct die_info *comp_unit_die,
11953 struct dwarf2_cu *cu = reader->cu;
11954 sect_offset sect_off = cu->per_cu->sect_off;
11955 struct dwarf2_section_info *section = cu->per_cu->section;
11956 struct create_dwo_cu_data *data = (struct create_dwo_cu_data *) datap;
11957 struct dwo_file *dwo_file = data->dwo_file;
11958 struct dwo_unit *dwo_unit = &data->dwo_unit;
11959 struct attribute *attr;
11961 attr = dwarf2_attr (comp_unit_die, DW_AT_GNU_dwo_id, cu);
11964 complaint (&symfile_complaints,
11965 _("Dwarf Error: debug entry at offset %s is missing"
11966 " its dwo_id [in module %s]"),
11967 sect_offset_str (sect_off), dwo_file->dwo_name);
11971 dwo_unit->dwo_file = dwo_file;
11972 dwo_unit->signature = DW_UNSND (attr);
11973 dwo_unit->section = section;
11974 dwo_unit->sect_off = sect_off;
11975 dwo_unit->length = cu->per_cu->length;
11977 if (dwarf_read_debug)
11978 fprintf_unfiltered (gdb_stdlog, " offset %s, dwo_id %s\n",
11979 sect_offset_str (sect_off),
11980 hex_string (dwo_unit->signature));
11983 /* Create the dwo_units for the CUs in a DWO_FILE.
11984 Note: This function processes DWO files only, not DWP files. */
11987 create_cus_hash_table (struct dwarf2_per_objfile *dwarf2_per_objfile,
11988 struct dwo_file &dwo_file, dwarf2_section_info §ion,
11991 struct objfile *objfile = dwarf2_per_objfile->objfile;
11992 const gdb_byte *info_ptr, *end_ptr;
11994 dwarf2_read_section (objfile, §ion);
11995 info_ptr = section.buffer;
11997 if (info_ptr == NULL)
12000 if (dwarf_read_debug)
12002 fprintf_unfiltered (gdb_stdlog, "Reading %s for %s:\n",
12003 get_section_name (§ion),
12004 get_section_file_name (§ion));
12007 end_ptr = info_ptr + section.size;
12008 while (info_ptr < end_ptr)
12010 struct dwarf2_per_cu_data per_cu;
12011 struct create_dwo_cu_data create_dwo_cu_data;
12012 struct dwo_unit *dwo_unit;
12014 sect_offset sect_off = (sect_offset) (info_ptr - section.buffer);
12016 memset (&create_dwo_cu_data.dwo_unit, 0,
12017 sizeof (create_dwo_cu_data.dwo_unit));
12018 memset (&per_cu, 0, sizeof (per_cu));
12019 per_cu.dwarf2_per_objfile = dwarf2_per_objfile;
12020 per_cu.is_debug_types = 0;
12021 per_cu.sect_off = sect_offset (info_ptr - section.buffer);
12022 per_cu.section = §ion;
12023 create_dwo_cu_data.dwo_file = &dwo_file;
12025 init_cutu_and_read_dies_no_follow (
12026 &per_cu, &dwo_file, create_dwo_cu_reader, &create_dwo_cu_data);
12027 info_ptr += per_cu.length;
12029 // If the unit could not be parsed, skip it.
12030 if (create_dwo_cu_data.dwo_unit.dwo_file == NULL)
12033 if (cus_htab == NULL)
12034 cus_htab = allocate_dwo_unit_table (objfile);
12036 dwo_unit = OBSTACK_ZALLOC (&objfile->objfile_obstack, struct dwo_unit);
12037 *dwo_unit = create_dwo_cu_data.dwo_unit;
12038 slot = htab_find_slot (cus_htab, dwo_unit, INSERT);
12039 gdb_assert (slot != NULL);
12042 const struct dwo_unit *dup_cu = (const struct dwo_unit *)*slot;
12043 sect_offset dup_sect_off = dup_cu->sect_off;
12045 complaint (&symfile_complaints,
12046 _("debug cu entry at offset %s is duplicate to"
12047 " the entry at offset %s, signature %s"),
12048 sect_offset_str (sect_off), sect_offset_str (dup_sect_off),
12049 hex_string (dwo_unit->signature));
12051 *slot = (void *)dwo_unit;
12055 /* DWP file .debug_{cu,tu}_index section format:
12056 [ref: http://gcc.gnu.org/wiki/DebugFissionDWP]
12060 Both index sections have the same format, and serve to map a 64-bit
12061 signature to a set of section numbers. Each section begins with a header,
12062 followed by a hash table of 64-bit signatures, a parallel table of 32-bit
12063 indexes, and a pool of 32-bit section numbers. The index sections will be
12064 aligned at 8-byte boundaries in the file.
12066 The index section header consists of:
12068 V, 32 bit version number
12070 N, 32 bit number of compilation units or type units in the index
12071 M, 32 bit number of slots in the hash table
12073 Numbers are recorded using the byte order of the application binary.
12075 The hash table begins at offset 16 in the section, and consists of an array
12076 of M 64-bit slots. Each slot contains a 64-bit signature (using the byte
12077 order of the application binary). Unused slots in the hash table are 0.
12078 (We rely on the extreme unlikeliness of a signature being exactly 0.)
12080 The parallel table begins immediately after the hash table
12081 (at offset 16 + 8 * M from the beginning of the section), and consists of an
12082 array of 32-bit indexes (using the byte order of the application binary),
12083 corresponding 1-1 with slots in the hash table. Each entry in the parallel
12084 table contains a 32-bit index into the pool of section numbers. For unused
12085 hash table slots, the corresponding entry in the parallel table will be 0.
12087 The pool of section numbers begins immediately following the hash table
12088 (at offset 16 + 12 * M from the beginning of the section). The pool of
12089 section numbers consists of an array of 32-bit words (using the byte order
12090 of the application binary). Each item in the array is indexed starting
12091 from 0. The hash table entry provides the index of the first section
12092 number in the set. Additional section numbers in the set follow, and the
12093 set is terminated by a 0 entry (section number 0 is not used in ELF).
12095 In each set of section numbers, the .debug_info.dwo or .debug_types.dwo
12096 section must be the first entry in the set, and the .debug_abbrev.dwo must
12097 be the second entry. Other members of the set may follow in any order.
12103 DWP Version 2 combines all the .debug_info, etc. sections into one,
12104 and the entries in the index tables are now offsets into these sections.
12105 CU offsets begin at 0. TU offsets begin at the size of the .debug_info
12108 Index Section Contents:
12110 Hash Table of Signatures dwp_hash_table.hash_table
12111 Parallel Table of Indices dwp_hash_table.unit_table
12112 Table of Section Offsets dwp_hash_table.v2.{section_ids,offsets}
12113 Table of Section Sizes dwp_hash_table.v2.sizes
12115 The index section header consists of:
12117 V, 32 bit version number
12118 L, 32 bit number of columns in the table of section offsets
12119 N, 32 bit number of compilation units or type units in the index
12120 M, 32 bit number of slots in the hash table
12122 Numbers are recorded using the byte order of the application binary.
12124 The hash table has the same format as version 1.
12125 The parallel table of indices has the same format as version 1,
12126 except that the entries are origin-1 indices into the table of sections
12127 offsets and the table of section sizes.
12129 The table of offsets begins immediately following the parallel table
12130 (at offset 16 + 12 * M from the beginning of the section). The table is
12131 a two-dimensional array of 32-bit words (using the byte order of the
12132 application binary), with L columns and N+1 rows, in row-major order.
12133 Each row in the array is indexed starting from 0. The first row provides
12134 a key to the remaining rows: each column in this row provides an identifier
12135 for a debug section, and the offsets in the same column of subsequent rows
12136 refer to that section. The section identifiers are:
12138 DW_SECT_INFO 1 .debug_info.dwo
12139 DW_SECT_TYPES 2 .debug_types.dwo
12140 DW_SECT_ABBREV 3 .debug_abbrev.dwo
12141 DW_SECT_LINE 4 .debug_line.dwo
12142 DW_SECT_LOC 5 .debug_loc.dwo
12143 DW_SECT_STR_OFFSETS 6 .debug_str_offsets.dwo
12144 DW_SECT_MACINFO 7 .debug_macinfo.dwo
12145 DW_SECT_MACRO 8 .debug_macro.dwo
12147 The offsets provided by the CU and TU index sections are the base offsets
12148 for the contributions made by each CU or TU to the corresponding section
12149 in the package file. Each CU and TU header contains an abbrev_offset
12150 field, used to find the abbreviations table for that CU or TU within the
12151 contribution to the .debug_abbrev.dwo section for that CU or TU, and should
12152 be interpreted as relative to the base offset given in the index section.
12153 Likewise, offsets into .debug_line.dwo from DW_AT_stmt_list attributes
12154 should be interpreted as relative to the base offset for .debug_line.dwo,
12155 and offsets into other debug sections obtained from DWARF attributes should
12156 also be interpreted as relative to the corresponding base offset.
12158 The table of sizes begins immediately following the table of offsets.
12159 Like the table of offsets, it is a two-dimensional array of 32-bit words,
12160 with L columns and N rows, in row-major order. Each row in the array is
12161 indexed starting from 1 (row 0 is shared by the two tables).
12165 Hash table lookup is handled the same in version 1 and 2:
12167 We assume that N and M will not exceed 2^32 - 1.
12168 The size of the hash table, M, must be 2^k such that 2^k > 3*N/2.
12170 Given a 64-bit compilation unit signature or a type signature S, an entry
12171 in the hash table is located as follows:
12173 1) Calculate a primary hash H = S & MASK(k), where MASK(k) is a mask with
12174 the low-order k bits all set to 1.
12176 2) Calculate a secondary hash H' = (((S >> 32) & MASK(k)) | 1).
12178 3) If the hash table entry at index H matches the signature, use that
12179 entry. If the hash table entry at index H is unused (all zeroes),
12180 terminate the search: the signature is not present in the table.
12182 4) Let H = (H + H') modulo M. Repeat at Step 3.
12184 Because M > N and H' and M are relatively prime, the search is guaranteed
12185 to stop at an unused slot or find the match. */
12187 /* Create a hash table to map DWO IDs to their CU/TU entry in
12188 .debug_{info,types}.dwo in DWP_FILE.
12189 Returns NULL if there isn't one.
12190 Note: This function processes DWP files only, not DWO files. */
12192 static struct dwp_hash_table *
12193 create_dwp_hash_table (struct dwarf2_per_objfile *dwarf2_per_objfile,
12194 struct dwp_file *dwp_file, int is_debug_types)
12196 struct objfile *objfile = dwarf2_per_objfile->objfile;
12197 bfd *dbfd = dwp_file->dbfd;
12198 const gdb_byte *index_ptr, *index_end;
12199 struct dwarf2_section_info *index;
12200 uint32_t version, nr_columns, nr_units, nr_slots;
12201 struct dwp_hash_table *htab;
12203 if (is_debug_types)
12204 index = &dwp_file->sections.tu_index;
12206 index = &dwp_file->sections.cu_index;
12208 if (dwarf2_section_empty_p (index))
12210 dwarf2_read_section (objfile, index);
12212 index_ptr = index->buffer;
12213 index_end = index_ptr + index->size;
12215 version = read_4_bytes (dbfd, index_ptr);
12218 nr_columns = read_4_bytes (dbfd, index_ptr);
12222 nr_units = read_4_bytes (dbfd, index_ptr);
12224 nr_slots = read_4_bytes (dbfd, index_ptr);
12227 if (version != 1 && version != 2)
12229 error (_("Dwarf Error: unsupported DWP file version (%s)"
12230 " [in module %s]"),
12231 pulongest (version), dwp_file->name);
12233 if (nr_slots != (nr_slots & -nr_slots))
12235 error (_("Dwarf Error: number of slots in DWP hash table (%s)"
12236 " is not power of 2 [in module %s]"),
12237 pulongest (nr_slots), dwp_file->name);
12240 htab = OBSTACK_ZALLOC (&objfile->objfile_obstack, struct dwp_hash_table);
12241 htab->version = version;
12242 htab->nr_columns = nr_columns;
12243 htab->nr_units = nr_units;
12244 htab->nr_slots = nr_slots;
12245 htab->hash_table = index_ptr;
12246 htab->unit_table = htab->hash_table + sizeof (uint64_t) * nr_slots;
12248 /* Exit early if the table is empty. */
12249 if (nr_slots == 0 || nr_units == 0
12250 || (version == 2 && nr_columns == 0))
12252 /* All must be zero. */
12253 if (nr_slots != 0 || nr_units != 0
12254 || (version == 2 && nr_columns != 0))
12256 complaint (&symfile_complaints,
12257 _("Empty DWP but nr_slots,nr_units,nr_columns not"
12258 " all zero [in modules %s]"),
12266 htab->section_pool.v1.indices =
12267 htab->unit_table + sizeof (uint32_t) * nr_slots;
12268 /* It's harder to decide whether the section is too small in v1.
12269 V1 is deprecated anyway so we punt. */
12273 const gdb_byte *ids_ptr = htab->unit_table + sizeof (uint32_t) * nr_slots;
12274 int *ids = htab->section_pool.v2.section_ids;
12275 /* Reverse map for error checking. */
12276 int ids_seen[DW_SECT_MAX + 1];
12279 if (nr_columns < 2)
12281 error (_("Dwarf Error: bad DWP hash table, too few columns"
12282 " in section table [in module %s]"),
12285 if (nr_columns > MAX_NR_V2_DWO_SECTIONS)
12287 error (_("Dwarf Error: bad DWP hash table, too many columns"
12288 " in section table [in module %s]"),
12291 memset (ids, 255, (DW_SECT_MAX + 1) * sizeof (int32_t));
12292 memset (ids_seen, 255, (DW_SECT_MAX + 1) * sizeof (int32_t));
12293 for (i = 0; i < nr_columns; ++i)
12295 int id = read_4_bytes (dbfd, ids_ptr + i * sizeof (uint32_t));
12297 if (id < DW_SECT_MIN || id > DW_SECT_MAX)
12299 error (_("Dwarf Error: bad DWP hash table, bad section id %d"
12300 " in section table [in module %s]"),
12301 id, dwp_file->name);
12303 if (ids_seen[id] != -1)
12305 error (_("Dwarf Error: bad DWP hash table, duplicate section"
12306 " id %d in section table [in module %s]"),
12307 id, dwp_file->name);
12312 /* Must have exactly one info or types section. */
12313 if (((ids_seen[DW_SECT_INFO] != -1)
12314 + (ids_seen[DW_SECT_TYPES] != -1))
12317 error (_("Dwarf Error: bad DWP hash table, missing/duplicate"
12318 " DWO info/types section [in module %s]"),
12321 /* Must have an abbrev section. */
12322 if (ids_seen[DW_SECT_ABBREV] == -1)
12324 error (_("Dwarf Error: bad DWP hash table, missing DWO abbrev"
12325 " section [in module %s]"),
12328 htab->section_pool.v2.offsets = ids_ptr + sizeof (uint32_t) * nr_columns;
12329 htab->section_pool.v2.sizes =
12330 htab->section_pool.v2.offsets + (sizeof (uint32_t)
12331 * nr_units * nr_columns);
12332 if ((htab->section_pool.v2.sizes + (sizeof (uint32_t)
12333 * nr_units * nr_columns))
12336 error (_("Dwarf Error: DWP index section is corrupt (too small)"
12337 " [in module %s]"),
12345 /* Update SECTIONS with the data from SECTP.
12347 This function is like the other "locate" section routines that are
12348 passed to bfd_map_over_sections, but in this context the sections to
12349 read comes from the DWP V1 hash table, not the full ELF section table.
12351 The result is non-zero for success, or zero if an error was found. */
12354 locate_v1_virtual_dwo_sections (asection *sectp,
12355 struct virtual_v1_dwo_sections *sections)
12357 const struct dwop_section_names *names = &dwop_section_names;
12359 if (section_is_p (sectp->name, &names->abbrev_dwo))
12361 /* There can be only one. */
12362 if (sections->abbrev.s.section != NULL)
12364 sections->abbrev.s.section = sectp;
12365 sections->abbrev.size = bfd_get_section_size (sectp);
12367 else if (section_is_p (sectp->name, &names->info_dwo)
12368 || section_is_p (sectp->name, &names->types_dwo))
12370 /* There can be only one. */
12371 if (sections->info_or_types.s.section != NULL)
12373 sections->info_or_types.s.section = sectp;
12374 sections->info_or_types.size = bfd_get_section_size (sectp);
12376 else if (section_is_p (sectp->name, &names->line_dwo))
12378 /* There can be only one. */
12379 if (sections->line.s.section != NULL)
12381 sections->line.s.section = sectp;
12382 sections->line.size = bfd_get_section_size (sectp);
12384 else if (section_is_p (sectp->name, &names->loc_dwo))
12386 /* There can be only one. */
12387 if (sections->loc.s.section != NULL)
12389 sections->loc.s.section = sectp;
12390 sections->loc.size = bfd_get_section_size (sectp);
12392 else if (section_is_p (sectp->name, &names->macinfo_dwo))
12394 /* There can be only one. */
12395 if (sections->macinfo.s.section != NULL)
12397 sections->macinfo.s.section = sectp;
12398 sections->macinfo.size = bfd_get_section_size (sectp);
12400 else if (section_is_p (sectp->name, &names->macro_dwo))
12402 /* There can be only one. */
12403 if (sections->macro.s.section != NULL)
12405 sections->macro.s.section = sectp;
12406 sections->macro.size = bfd_get_section_size (sectp);
12408 else if (section_is_p (sectp->name, &names->str_offsets_dwo))
12410 /* There can be only one. */
12411 if (sections->str_offsets.s.section != NULL)
12413 sections->str_offsets.s.section = sectp;
12414 sections->str_offsets.size = bfd_get_section_size (sectp);
12418 /* No other kind of section is valid. */
12425 /* Create a dwo_unit object for the DWO unit with signature SIGNATURE.
12426 UNIT_INDEX is the index of the DWO unit in the DWP hash table.
12427 COMP_DIR is the DW_AT_comp_dir attribute of the referencing CU.
12428 This is for DWP version 1 files. */
12430 static struct dwo_unit *
12431 create_dwo_unit_in_dwp_v1 (struct dwarf2_per_objfile *dwarf2_per_objfile,
12432 struct dwp_file *dwp_file,
12433 uint32_t unit_index,
12434 const char *comp_dir,
12435 ULONGEST signature, int is_debug_types)
12437 struct objfile *objfile = dwarf2_per_objfile->objfile;
12438 const struct dwp_hash_table *dwp_htab =
12439 is_debug_types ? dwp_file->tus : dwp_file->cus;
12440 bfd *dbfd = dwp_file->dbfd;
12441 const char *kind = is_debug_types ? "TU" : "CU";
12442 struct dwo_file *dwo_file;
12443 struct dwo_unit *dwo_unit;
12444 struct virtual_v1_dwo_sections sections;
12445 void **dwo_file_slot;
12448 gdb_assert (dwp_file->version == 1);
12450 if (dwarf_read_debug)
12452 fprintf_unfiltered (gdb_stdlog, "Reading %s %s/%s in DWP V1 file: %s\n",
12454 pulongest (unit_index), hex_string (signature),
12458 /* Fetch the sections of this DWO unit.
12459 Put a limit on the number of sections we look for so that bad data
12460 doesn't cause us to loop forever. */
12462 #define MAX_NR_V1_DWO_SECTIONS \
12463 (1 /* .debug_info or .debug_types */ \
12464 + 1 /* .debug_abbrev */ \
12465 + 1 /* .debug_line */ \
12466 + 1 /* .debug_loc */ \
12467 + 1 /* .debug_str_offsets */ \
12468 + 1 /* .debug_macro or .debug_macinfo */ \
12469 + 1 /* trailing zero */)
12471 memset (§ions, 0, sizeof (sections));
12473 for (i = 0; i < MAX_NR_V1_DWO_SECTIONS; ++i)
12476 uint32_t section_nr =
12477 read_4_bytes (dbfd,
12478 dwp_htab->section_pool.v1.indices
12479 + (unit_index + i) * sizeof (uint32_t));
12481 if (section_nr == 0)
12483 if (section_nr >= dwp_file->num_sections)
12485 error (_("Dwarf Error: bad DWP hash table, section number too large"
12486 " [in module %s]"),
12490 sectp = dwp_file->elf_sections[section_nr];
12491 if (! locate_v1_virtual_dwo_sections (sectp, §ions))
12493 error (_("Dwarf Error: bad DWP hash table, invalid section found"
12494 " [in module %s]"),
12500 || dwarf2_section_empty_p (§ions.info_or_types)
12501 || dwarf2_section_empty_p (§ions.abbrev))
12503 error (_("Dwarf Error: bad DWP hash table, missing DWO sections"
12504 " [in module %s]"),
12507 if (i == MAX_NR_V1_DWO_SECTIONS)
12509 error (_("Dwarf Error: bad DWP hash table, too many DWO sections"
12510 " [in module %s]"),
12514 /* It's easier for the rest of the code if we fake a struct dwo_file and
12515 have dwo_unit "live" in that. At least for now.
12517 The DWP file can be made up of a random collection of CUs and TUs.
12518 However, for each CU + set of TUs that came from the same original DWO
12519 file, we can combine them back into a virtual DWO file to save space
12520 (fewer struct dwo_file objects to allocate). Remember that for really
12521 large apps there can be on the order of 8K CUs and 200K TUs, or more. */
12523 std::string virtual_dwo_name =
12524 string_printf ("virtual-dwo/%d-%d-%d-%d",
12525 get_section_id (§ions.abbrev),
12526 get_section_id (§ions.line),
12527 get_section_id (§ions.loc),
12528 get_section_id (§ions.str_offsets));
12529 /* Can we use an existing virtual DWO file? */
12530 dwo_file_slot = lookup_dwo_file_slot (dwarf2_per_objfile,
12531 virtual_dwo_name.c_str (),
12533 /* Create one if necessary. */
12534 if (*dwo_file_slot == NULL)
12536 if (dwarf_read_debug)
12538 fprintf_unfiltered (gdb_stdlog, "Creating virtual DWO: %s\n",
12539 virtual_dwo_name.c_str ());
12541 dwo_file = OBSTACK_ZALLOC (&objfile->objfile_obstack, struct dwo_file);
12543 = (const char *) obstack_copy0 (&objfile->objfile_obstack,
12544 virtual_dwo_name.c_str (),
12545 virtual_dwo_name.size ());
12546 dwo_file->comp_dir = comp_dir;
12547 dwo_file->sections.abbrev = sections.abbrev;
12548 dwo_file->sections.line = sections.line;
12549 dwo_file->sections.loc = sections.loc;
12550 dwo_file->sections.macinfo = sections.macinfo;
12551 dwo_file->sections.macro = sections.macro;
12552 dwo_file->sections.str_offsets = sections.str_offsets;
12553 /* The "str" section is global to the entire DWP file. */
12554 dwo_file->sections.str = dwp_file->sections.str;
12555 /* The info or types section is assigned below to dwo_unit,
12556 there's no need to record it in dwo_file.
12557 Also, we can't simply record type sections in dwo_file because
12558 we record a pointer into the vector in dwo_unit. As we collect more
12559 types we'll grow the vector and eventually have to reallocate space
12560 for it, invalidating all copies of pointers into the previous
12562 *dwo_file_slot = dwo_file;
12566 if (dwarf_read_debug)
12568 fprintf_unfiltered (gdb_stdlog, "Using existing virtual DWO: %s\n",
12569 virtual_dwo_name.c_str ());
12571 dwo_file = (struct dwo_file *) *dwo_file_slot;
12574 dwo_unit = OBSTACK_ZALLOC (&objfile->objfile_obstack, struct dwo_unit);
12575 dwo_unit->dwo_file = dwo_file;
12576 dwo_unit->signature = signature;
12577 dwo_unit->section =
12578 XOBNEW (&objfile->objfile_obstack, struct dwarf2_section_info);
12579 *dwo_unit->section = sections.info_or_types;
12580 /* dwo_unit->{offset,length,type_offset_in_tu} are set later. */
12585 /* Subroutine of create_dwo_unit_in_dwp_v2 to simplify it.
12586 Given a pointer to the containing section SECTION, and OFFSET,SIZE of the
12587 piece within that section used by a TU/CU, return a virtual section
12588 of just that piece. */
12590 static struct dwarf2_section_info
12591 create_dwp_v2_section (struct dwarf2_per_objfile *dwarf2_per_objfile,
12592 struct dwarf2_section_info *section,
12593 bfd_size_type offset, bfd_size_type size)
12595 struct dwarf2_section_info result;
12598 gdb_assert (section != NULL);
12599 gdb_assert (!section->is_virtual);
12601 memset (&result, 0, sizeof (result));
12602 result.s.containing_section = section;
12603 result.is_virtual = 1;
12608 sectp = get_section_bfd_section (section);
12610 /* Flag an error if the piece denoted by OFFSET,SIZE is outside the
12611 bounds of the real section. This is a pretty-rare event, so just
12612 flag an error (easier) instead of a warning and trying to cope. */
12614 || offset + size > bfd_get_section_size (sectp))
12616 error (_("Dwarf Error: Bad DWP V2 section info, doesn't fit"
12617 " in section %s [in module %s]"),
12618 sectp ? bfd_section_name (abfd, sectp) : "<unknown>",
12619 objfile_name (dwarf2_per_objfile->objfile));
12622 result.virtual_offset = offset;
12623 result.size = size;
12627 /* Create a dwo_unit object for the DWO unit with signature SIGNATURE.
12628 UNIT_INDEX is the index of the DWO unit in the DWP hash table.
12629 COMP_DIR is the DW_AT_comp_dir attribute of the referencing CU.
12630 This is for DWP version 2 files. */
12632 static struct dwo_unit *
12633 create_dwo_unit_in_dwp_v2 (struct dwarf2_per_objfile *dwarf2_per_objfile,
12634 struct dwp_file *dwp_file,
12635 uint32_t unit_index,
12636 const char *comp_dir,
12637 ULONGEST signature, int is_debug_types)
12639 struct objfile *objfile = dwarf2_per_objfile->objfile;
12640 const struct dwp_hash_table *dwp_htab =
12641 is_debug_types ? dwp_file->tus : dwp_file->cus;
12642 bfd *dbfd = dwp_file->dbfd;
12643 const char *kind = is_debug_types ? "TU" : "CU";
12644 struct dwo_file *dwo_file;
12645 struct dwo_unit *dwo_unit;
12646 struct virtual_v2_dwo_sections sections;
12647 void **dwo_file_slot;
12650 gdb_assert (dwp_file->version == 2);
12652 if (dwarf_read_debug)
12654 fprintf_unfiltered (gdb_stdlog, "Reading %s %s/%s in DWP V2 file: %s\n",
12656 pulongest (unit_index), hex_string (signature),
12660 /* Fetch the section offsets of this DWO unit. */
12662 memset (§ions, 0, sizeof (sections));
12664 for (i = 0; i < dwp_htab->nr_columns; ++i)
12666 uint32_t offset = read_4_bytes (dbfd,
12667 dwp_htab->section_pool.v2.offsets
12668 + (((unit_index - 1) * dwp_htab->nr_columns
12670 * sizeof (uint32_t)));
12671 uint32_t size = read_4_bytes (dbfd,
12672 dwp_htab->section_pool.v2.sizes
12673 + (((unit_index - 1) * dwp_htab->nr_columns
12675 * sizeof (uint32_t)));
12677 switch (dwp_htab->section_pool.v2.section_ids[i])
12680 case DW_SECT_TYPES:
12681 sections.info_or_types_offset = offset;
12682 sections.info_or_types_size = size;
12684 case DW_SECT_ABBREV:
12685 sections.abbrev_offset = offset;
12686 sections.abbrev_size = size;
12689 sections.line_offset = offset;
12690 sections.line_size = size;
12693 sections.loc_offset = offset;
12694 sections.loc_size = size;
12696 case DW_SECT_STR_OFFSETS:
12697 sections.str_offsets_offset = offset;
12698 sections.str_offsets_size = size;
12700 case DW_SECT_MACINFO:
12701 sections.macinfo_offset = offset;
12702 sections.macinfo_size = size;
12704 case DW_SECT_MACRO:
12705 sections.macro_offset = offset;
12706 sections.macro_size = size;
12711 /* It's easier for the rest of the code if we fake a struct dwo_file and
12712 have dwo_unit "live" in that. At least for now.
12714 The DWP file can be made up of a random collection of CUs and TUs.
12715 However, for each CU + set of TUs that came from the same original DWO
12716 file, we can combine them back into a virtual DWO file to save space
12717 (fewer struct dwo_file objects to allocate). Remember that for really
12718 large apps there can be on the order of 8K CUs and 200K TUs, or more. */
12720 std::string virtual_dwo_name =
12721 string_printf ("virtual-dwo/%ld-%ld-%ld-%ld",
12722 (long) (sections.abbrev_size ? sections.abbrev_offset : 0),
12723 (long) (sections.line_size ? sections.line_offset : 0),
12724 (long) (sections.loc_size ? sections.loc_offset : 0),
12725 (long) (sections.str_offsets_size
12726 ? sections.str_offsets_offset : 0));
12727 /* Can we use an existing virtual DWO file? */
12728 dwo_file_slot = lookup_dwo_file_slot (dwarf2_per_objfile,
12729 virtual_dwo_name.c_str (),
12731 /* Create one if necessary. */
12732 if (*dwo_file_slot == NULL)
12734 if (dwarf_read_debug)
12736 fprintf_unfiltered (gdb_stdlog, "Creating virtual DWO: %s\n",
12737 virtual_dwo_name.c_str ());
12739 dwo_file = OBSTACK_ZALLOC (&objfile->objfile_obstack, struct dwo_file);
12741 = (const char *) obstack_copy0 (&objfile->objfile_obstack,
12742 virtual_dwo_name.c_str (),
12743 virtual_dwo_name.size ());
12744 dwo_file->comp_dir = comp_dir;
12745 dwo_file->sections.abbrev =
12746 create_dwp_v2_section (dwarf2_per_objfile, &dwp_file->sections.abbrev,
12747 sections.abbrev_offset, sections.abbrev_size);
12748 dwo_file->sections.line =
12749 create_dwp_v2_section (dwarf2_per_objfile, &dwp_file->sections.line,
12750 sections.line_offset, sections.line_size);
12751 dwo_file->sections.loc =
12752 create_dwp_v2_section (dwarf2_per_objfile, &dwp_file->sections.loc,
12753 sections.loc_offset, sections.loc_size);
12754 dwo_file->sections.macinfo =
12755 create_dwp_v2_section (dwarf2_per_objfile, &dwp_file->sections.macinfo,
12756 sections.macinfo_offset, sections.macinfo_size);
12757 dwo_file->sections.macro =
12758 create_dwp_v2_section (dwarf2_per_objfile, &dwp_file->sections.macro,
12759 sections.macro_offset, sections.macro_size);
12760 dwo_file->sections.str_offsets =
12761 create_dwp_v2_section (dwarf2_per_objfile,
12762 &dwp_file->sections.str_offsets,
12763 sections.str_offsets_offset,
12764 sections.str_offsets_size);
12765 /* The "str" section is global to the entire DWP file. */
12766 dwo_file->sections.str = dwp_file->sections.str;
12767 /* The info or types section is assigned below to dwo_unit,
12768 there's no need to record it in dwo_file.
12769 Also, we can't simply record type sections in dwo_file because
12770 we record a pointer into the vector in dwo_unit. As we collect more
12771 types we'll grow the vector and eventually have to reallocate space
12772 for it, invalidating all copies of pointers into the previous
12774 *dwo_file_slot = dwo_file;
12778 if (dwarf_read_debug)
12780 fprintf_unfiltered (gdb_stdlog, "Using existing virtual DWO: %s\n",
12781 virtual_dwo_name.c_str ());
12783 dwo_file = (struct dwo_file *) *dwo_file_slot;
12786 dwo_unit = OBSTACK_ZALLOC (&objfile->objfile_obstack, struct dwo_unit);
12787 dwo_unit->dwo_file = dwo_file;
12788 dwo_unit->signature = signature;
12789 dwo_unit->section =
12790 XOBNEW (&objfile->objfile_obstack, struct dwarf2_section_info);
12791 *dwo_unit->section = create_dwp_v2_section (dwarf2_per_objfile,
12793 ? &dwp_file->sections.types
12794 : &dwp_file->sections.info,
12795 sections.info_or_types_offset,
12796 sections.info_or_types_size);
12797 /* dwo_unit->{offset,length,type_offset_in_tu} are set later. */
12802 /* Lookup the DWO unit with SIGNATURE in DWP_FILE.
12803 Returns NULL if the signature isn't found. */
12805 static struct dwo_unit *
12806 lookup_dwo_unit_in_dwp (struct dwarf2_per_objfile *dwarf2_per_objfile,
12807 struct dwp_file *dwp_file, const char *comp_dir,
12808 ULONGEST signature, int is_debug_types)
12810 const struct dwp_hash_table *dwp_htab =
12811 is_debug_types ? dwp_file->tus : dwp_file->cus;
12812 bfd *dbfd = dwp_file->dbfd;
12813 uint32_t mask = dwp_htab->nr_slots - 1;
12814 uint32_t hash = signature & mask;
12815 uint32_t hash2 = ((signature >> 32) & mask) | 1;
12818 struct dwo_unit find_dwo_cu;
12820 memset (&find_dwo_cu, 0, sizeof (find_dwo_cu));
12821 find_dwo_cu.signature = signature;
12822 slot = htab_find_slot (is_debug_types
12823 ? dwp_file->loaded_tus
12824 : dwp_file->loaded_cus,
12825 &find_dwo_cu, INSERT);
12828 return (struct dwo_unit *) *slot;
12830 /* Use a for loop so that we don't loop forever on bad debug info. */
12831 for (i = 0; i < dwp_htab->nr_slots; ++i)
12833 ULONGEST signature_in_table;
12835 signature_in_table =
12836 read_8_bytes (dbfd, dwp_htab->hash_table + hash * sizeof (uint64_t));
12837 if (signature_in_table == signature)
12839 uint32_t unit_index =
12840 read_4_bytes (dbfd,
12841 dwp_htab->unit_table + hash * sizeof (uint32_t));
12843 if (dwp_file->version == 1)
12845 *slot = create_dwo_unit_in_dwp_v1 (dwarf2_per_objfile,
12846 dwp_file, unit_index,
12847 comp_dir, signature,
12852 *slot = create_dwo_unit_in_dwp_v2 (dwarf2_per_objfile,
12853 dwp_file, unit_index,
12854 comp_dir, signature,
12857 return (struct dwo_unit *) *slot;
12859 if (signature_in_table == 0)
12861 hash = (hash + hash2) & mask;
12864 error (_("Dwarf Error: bad DWP hash table, lookup didn't terminate"
12865 " [in module %s]"),
12869 /* Subroutine of open_dwo_file,open_dwp_file to simplify them.
12870 Open the file specified by FILE_NAME and hand it off to BFD for
12871 preliminary analysis. Return a newly initialized bfd *, which
12872 includes a canonicalized copy of FILE_NAME.
12873 If IS_DWP is TRUE, we're opening a DWP file, otherwise a DWO file.
12874 SEARCH_CWD is true if the current directory is to be searched.
12875 It will be searched before debug-file-directory.
12876 If successful, the file is added to the bfd include table of the
12877 objfile's bfd (see gdb_bfd_record_inclusion).
12878 If unable to find/open the file, return NULL.
12879 NOTE: This function is derived from symfile_bfd_open. */
12881 static gdb_bfd_ref_ptr
12882 try_open_dwop_file (struct dwarf2_per_objfile *dwarf2_per_objfile,
12883 const char *file_name, int is_dwp, int search_cwd)
12886 /* Blech. OPF_TRY_CWD_FIRST also disables searching the path list if
12887 FILE_NAME contains a '/'. So we can't use it. Instead prepend "."
12888 to debug_file_directory. */
12889 const char *search_path;
12890 static const char dirname_separator_string[] = { DIRNAME_SEPARATOR, '\0' };
12892 gdb::unique_xmalloc_ptr<char> search_path_holder;
12895 if (*debug_file_directory != '\0')
12897 search_path_holder.reset (concat (".", dirname_separator_string,
12898 debug_file_directory,
12900 search_path = search_path_holder.get ();
12906 search_path = debug_file_directory;
12908 openp_flags flags = OPF_RETURN_REALPATH;
12910 flags |= OPF_SEARCH_IN_PATH;
12912 gdb::unique_xmalloc_ptr<char> absolute_name;
12913 desc = openp (search_path, flags, file_name,
12914 O_RDONLY | O_BINARY, &absolute_name);
12918 gdb_bfd_ref_ptr sym_bfd (gdb_bfd_open (absolute_name.get (),
12920 if (sym_bfd == NULL)
12922 bfd_set_cacheable (sym_bfd.get (), 1);
12924 if (!bfd_check_format (sym_bfd.get (), bfd_object))
12927 /* Success. Record the bfd as having been included by the objfile's bfd.
12928 This is important because things like demangled_names_hash lives in the
12929 objfile's per_bfd space and may have references to things like symbol
12930 names that live in the DWO/DWP file's per_bfd space. PR 16426. */
12931 gdb_bfd_record_inclusion (dwarf2_per_objfile->objfile->obfd, sym_bfd.get ());
12936 /* Try to open DWO file FILE_NAME.
12937 COMP_DIR is the DW_AT_comp_dir attribute.
12938 The result is the bfd handle of the file.
12939 If there is a problem finding or opening the file, return NULL.
12940 Upon success, the canonicalized path of the file is stored in the bfd,
12941 same as symfile_bfd_open. */
12943 static gdb_bfd_ref_ptr
12944 open_dwo_file (struct dwarf2_per_objfile *dwarf2_per_objfile,
12945 const char *file_name, const char *comp_dir)
12947 if (IS_ABSOLUTE_PATH (file_name))
12948 return try_open_dwop_file (dwarf2_per_objfile, file_name,
12949 0 /*is_dwp*/, 0 /*search_cwd*/);
12951 /* Before trying the search path, try DWO_NAME in COMP_DIR. */
12953 if (comp_dir != NULL)
12955 char *path_to_try = concat (comp_dir, SLASH_STRING,
12956 file_name, (char *) NULL);
12958 /* NOTE: If comp_dir is a relative path, this will also try the
12959 search path, which seems useful. */
12960 gdb_bfd_ref_ptr abfd (try_open_dwop_file (dwarf2_per_objfile,
12963 1 /*search_cwd*/));
12964 xfree (path_to_try);
12969 /* That didn't work, try debug-file-directory, which, despite its name,
12970 is a list of paths. */
12972 if (*debug_file_directory == '\0')
12975 return try_open_dwop_file (dwarf2_per_objfile, file_name,
12976 0 /*is_dwp*/, 1 /*search_cwd*/);
12979 /* This function is mapped across the sections and remembers the offset and
12980 size of each of the DWO debugging sections we are interested in. */
12983 dwarf2_locate_dwo_sections (bfd *abfd, asection *sectp, void *dwo_sections_ptr)
12985 struct dwo_sections *dwo_sections = (struct dwo_sections *) dwo_sections_ptr;
12986 const struct dwop_section_names *names = &dwop_section_names;
12988 if (section_is_p (sectp->name, &names->abbrev_dwo))
12990 dwo_sections->abbrev.s.section = sectp;
12991 dwo_sections->abbrev.size = bfd_get_section_size (sectp);
12993 else if (section_is_p (sectp->name, &names->info_dwo))
12995 dwo_sections->info.s.section = sectp;
12996 dwo_sections->info.size = bfd_get_section_size (sectp);
12998 else if (section_is_p (sectp->name, &names->line_dwo))
13000 dwo_sections->line.s.section = sectp;
13001 dwo_sections->line.size = bfd_get_section_size (sectp);
13003 else if (section_is_p (sectp->name, &names->loc_dwo))
13005 dwo_sections->loc.s.section = sectp;
13006 dwo_sections->loc.size = bfd_get_section_size (sectp);
13008 else if (section_is_p (sectp->name, &names->macinfo_dwo))
13010 dwo_sections->macinfo.s.section = sectp;
13011 dwo_sections->macinfo.size = bfd_get_section_size (sectp);
13013 else if (section_is_p (sectp->name, &names->macro_dwo))
13015 dwo_sections->macro.s.section = sectp;
13016 dwo_sections->macro.size = bfd_get_section_size (sectp);
13018 else if (section_is_p (sectp->name, &names->str_dwo))
13020 dwo_sections->str.s.section = sectp;
13021 dwo_sections->str.size = bfd_get_section_size (sectp);
13023 else if (section_is_p (sectp->name, &names->str_offsets_dwo))
13025 dwo_sections->str_offsets.s.section = sectp;
13026 dwo_sections->str_offsets.size = bfd_get_section_size (sectp);
13028 else if (section_is_p (sectp->name, &names->types_dwo))
13030 struct dwarf2_section_info type_section;
13032 memset (&type_section, 0, sizeof (type_section));
13033 type_section.s.section = sectp;
13034 type_section.size = bfd_get_section_size (sectp);
13035 VEC_safe_push (dwarf2_section_info_def, dwo_sections->types,
13040 /* Initialize the use of the DWO file specified by DWO_NAME and referenced
13041 by PER_CU. This is for the non-DWP case.
13042 The result is NULL if DWO_NAME can't be found. */
13044 static struct dwo_file *
13045 open_and_init_dwo_file (struct dwarf2_per_cu_data *per_cu,
13046 const char *dwo_name, const char *comp_dir)
13048 struct dwarf2_per_objfile *dwarf2_per_objfile = per_cu->dwarf2_per_objfile;
13049 struct objfile *objfile = dwarf2_per_objfile->objfile;
13050 struct dwo_file *dwo_file;
13051 struct cleanup *cleanups;
13053 gdb_bfd_ref_ptr dbfd (open_dwo_file (dwarf2_per_objfile, dwo_name, comp_dir));
13056 if (dwarf_read_debug)
13057 fprintf_unfiltered (gdb_stdlog, "DWO file not found: %s\n", dwo_name);
13060 dwo_file = OBSTACK_ZALLOC (&objfile->objfile_obstack, struct dwo_file);
13061 dwo_file->dwo_name = dwo_name;
13062 dwo_file->comp_dir = comp_dir;
13063 dwo_file->dbfd = dbfd.release ();
13065 free_dwo_file_cleanup_data *cleanup_data = XNEW (free_dwo_file_cleanup_data);
13066 cleanup_data->dwo_file = dwo_file;
13067 cleanup_data->dwarf2_per_objfile = dwarf2_per_objfile;
13069 cleanups = make_cleanup (free_dwo_file_cleanup, cleanup_data);
13071 bfd_map_over_sections (dwo_file->dbfd, dwarf2_locate_dwo_sections,
13072 &dwo_file->sections);
13074 create_cus_hash_table (dwarf2_per_objfile, *dwo_file, dwo_file->sections.info,
13077 create_debug_types_hash_table (dwarf2_per_objfile, dwo_file,
13078 dwo_file->sections.types, dwo_file->tus);
13080 discard_cleanups (cleanups);
13082 if (dwarf_read_debug)
13083 fprintf_unfiltered (gdb_stdlog, "DWO file found: %s\n", dwo_name);
13088 /* This function is mapped across the sections and remembers the offset and
13089 size of each of the DWP debugging sections common to version 1 and 2 that
13090 we are interested in. */
13093 dwarf2_locate_common_dwp_sections (bfd *abfd, asection *sectp,
13094 void *dwp_file_ptr)
13096 struct dwp_file *dwp_file = (struct dwp_file *) dwp_file_ptr;
13097 const struct dwop_section_names *names = &dwop_section_names;
13098 unsigned int elf_section_nr = elf_section_data (sectp)->this_idx;
13100 /* Record the ELF section number for later lookup: this is what the
13101 .debug_cu_index,.debug_tu_index tables use in DWP V1. */
13102 gdb_assert (elf_section_nr < dwp_file->num_sections);
13103 dwp_file->elf_sections[elf_section_nr] = sectp;
13105 /* Look for specific sections that we need. */
13106 if (section_is_p (sectp->name, &names->str_dwo))
13108 dwp_file->sections.str.s.section = sectp;
13109 dwp_file->sections.str.size = bfd_get_section_size (sectp);
13111 else if (section_is_p (sectp->name, &names->cu_index))
13113 dwp_file->sections.cu_index.s.section = sectp;
13114 dwp_file->sections.cu_index.size = bfd_get_section_size (sectp);
13116 else if (section_is_p (sectp->name, &names->tu_index))
13118 dwp_file->sections.tu_index.s.section = sectp;
13119 dwp_file->sections.tu_index.size = bfd_get_section_size (sectp);
13123 /* This function is mapped across the sections and remembers the offset and
13124 size of each of the DWP version 2 debugging sections that we are interested
13125 in. This is split into a separate function because we don't know if we
13126 have version 1 or 2 until we parse the cu_index/tu_index sections. */
13129 dwarf2_locate_v2_dwp_sections (bfd *abfd, asection *sectp, void *dwp_file_ptr)
13131 struct dwp_file *dwp_file = (struct dwp_file *) dwp_file_ptr;
13132 const struct dwop_section_names *names = &dwop_section_names;
13133 unsigned int elf_section_nr = elf_section_data (sectp)->this_idx;
13135 /* Record the ELF section number for later lookup: this is what the
13136 .debug_cu_index,.debug_tu_index tables use in DWP V1. */
13137 gdb_assert (elf_section_nr < dwp_file->num_sections);
13138 dwp_file->elf_sections[elf_section_nr] = sectp;
13140 /* Look for specific sections that we need. */
13141 if (section_is_p (sectp->name, &names->abbrev_dwo))
13143 dwp_file->sections.abbrev.s.section = sectp;
13144 dwp_file->sections.abbrev.size = bfd_get_section_size (sectp);
13146 else if (section_is_p (sectp->name, &names->info_dwo))
13148 dwp_file->sections.info.s.section = sectp;
13149 dwp_file->sections.info.size = bfd_get_section_size (sectp);
13151 else if (section_is_p (sectp->name, &names->line_dwo))
13153 dwp_file->sections.line.s.section = sectp;
13154 dwp_file->sections.line.size = bfd_get_section_size (sectp);
13156 else if (section_is_p (sectp->name, &names->loc_dwo))
13158 dwp_file->sections.loc.s.section = sectp;
13159 dwp_file->sections.loc.size = bfd_get_section_size (sectp);
13161 else if (section_is_p (sectp->name, &names->macinfo_dwo))
13163 dwp_file->sections.macinfo.s.section = sectp;
13164 dwp_file->sections.macinfo.size = bfd_get_section_size (sectp);
13166 else if (section_is_p (sectp->name, &names->macro_dwo))
13168 dwp_file->sections.macro.s.section = sectp;
13169 dwp_file->sections.macro.size = bfd_get_section_size (sectp);
13171 else if (section_is_p (sectp->name, &names->str_offsets_dwo))
13173 dwp_file->sections.str_offsets.s.section = sectp;
13174 dwp_file->sections.str_offsets.size = bfd_get_section_size (sectp);
13176 else if (section_is_p (sectp->name, &names->types_dwo))
13178 dwp_file->sections.types.s.section = sectp;
13179 dwp_file->sections.types.size = bfd_get_section_size (sectp);
13183 /* Hash function for dwp_file loaded CUs/TUs. */
13186 hash_dwp_loaded_cutus (const void *item)
13188 const struct dwo_unit *dwo_unit = (const struct dwo_unit *) item;
13190 /* This drops the top 32 bits of the signature, but is ok for a hash. */
13191 return dwo_unit->signature;
13194 /* Equality function for dwp_file loaded CUs/TUs. */
13197 eq_dwp_loaded_cutus (const void *a, const void *b)
13199 const struct dwo_unit *dua = (const struct dwo_unit *) a;
13200 const struct dwo_unit *dub = (const struct dwo_unit *) b;
13202 return dua->signature == dub->signature;
13205 /* Allocate a hash table for dwp_file loaded CUs/TUs. */
13208 allocate_dwp_loaded_cutus_table (struct objfile *objfile)
13210 return htab_create_alloc_ex (3,
13211 hash_dwp_loaded_cutus,
13212 eq_dwp_loaded_cutus,
13214 &objfile->objfile_obstack,
13215 hashtab_obstack_allocate,
13216 dummy_obstack_deallocate);
13219 /* Try to open DWP file FILE_NAME.
13220 The result is the bfd handle of the file.
13221 If there is a problem finding or opening the file, return NULL.
13222 Upon success, the canonicalized path of the file is stored in the bfd,
13223 same as symfile_bfd_open. */
13225 static gdb_bfd_ref_ptr
13226 open_dwp_file (struct dwarf2_per_objfile *dwarf2_per_objfile,
13227 const char *file_name)
13229 gdb_bfd_ref_ptr abfd (try_open_dwop_file (dwarf2_per_objfile, file_name,
13231 1 /*search_cwd*/));
13235 /* Work around upstream bug 15652.
13236 http://sourceware.org/bugzilla/show_bug.cgi?id=15652
13237 [Whether that's a "bug" is debatable, but it is getting in our way.]
13238 We have no real idea where the dwp file is, because gdb's realpath-ing
13239 of the executable's path may have discarded the needed info.
13240 [IWBN if the dwp file name was recorded in the executable, akin to
13241 .gnu_debuglink, but that doesn't exist yet.]
13242 Strip the directory from FILE_NAME and search again. */
13243 if (*debug_file_directory != '\0')
13245 /* Don't implicitly search the current directory here.
13246 If the user wants to search "." to handle this case,
13247 it must be added to debug-file-directory. */
13248 return try_open_dwop_file (dwarf2_per_objfile,
13249 lbasename (file_name), 1 /*is_dwp*/,
13256 /* Initialize the use of the DWP file for the current objfile.
13257 By convention the name of the DWP file is ${objfile}.dwp.
13258 The result is NULL if it can't be found. */
13260 static struct dwp_file *
13261 open_and_init_dwp_file (struct dwarf2_per_objfile *dwarf2_per_objfile)
13263 struct objfile *objfile = dwarf2_per_objfile->objfile;
13264 struct dwp_file *dwp_file;
13266 /* Try to find first .dwp for the binary file before any symbolic links
13269 /* If the objfile is a debug file, find the name of the real binary
13270 file and get the name of dwp file from there. */
13271 std::string dwp_name;
13272 if (objfile->separate_debug_objfile_backlink != NULL)
13274 struct objfile *backlink = objfile->separate_debug_objfile_backlink;
13275 const char *backlink_basename = lbasename (backlink->original_name);
13277 dwp_name = ldirname (objfile->original_name) + SLASH_STRING + backlink_basename;
13280 dwp_name = objfile->original_name;
13282 dwp_name += ".dwp";
13284 gdb_bfd_ref_ptr dbfd (open_dwp_file (dwarf2_per_objfile, dwp_name.c_str ()));
13286 && strcmp (objfile->original_name, objfile_name (objfile)) != 0)
13288 /* Try to find .dwp for the binary file after gdb_realpath resolving. */
13289 dwp_name = objfile_name (objfile);
13290 dwp_name += ".dwp";
13291 dbfd = open_dwp_file (dwarf2_per_objfile, dwp_name.c_str ());
13296 if (dwarf_read_debug)
13297 fprintf_unfiltered (gdb_stdlog, "DWP file not found: %s\n", dwp_name.c_str ());
13300 dwp_file = OBSTACK_ZALLOC (&objfile->objfile_obstack, struct dwp_file);
13301 dwp_file->name = bfd_get_filename (dbfd.get ());
13302 dwp_file->dbfd = dbfd.release ();
13304 /* +1: section 0 is unused */
13305 dwp_file->num_sections = bfd_count_sections (dwp_file->dbfd) + 1;
13306 dwp_file->elf_sections =
13307 OBSTACK_CALLOC (&objfile->objfile_obstack,
13308 dwp_file->num_sections, asection *);
13310 bfd_map_over_sections (dwp_file->dbfd, dwarf2_locate_common_dwp_sections,
13313 dwp_file->cus = create_dwp_hash_table (dwarf2_per_objfile, dwp_file, 0);
13315 dwp_file->tus = create_dwp_hash_table (dwarf2_per_objfile, dwp_file, 1);
13317 /* The DWP file version is stored in the hash table. Oh well. */
13318 if (dwp_file->cus && dwp_file->tus
13319 && dwp_file->cus->version != dwp_file->tus->version)
13321 /* Technically speaking, we should try to limp along, but this is
13322 pretty bizarre. We use pulongest here because that's the established
13323 portability solution (e.g, we cannot use %u for uint32_t). */
13324 error (_("Dwarf Error: DWP file CU version %s doesn't match"
13325 " TU version %s [in DWP file %s]"),
13326 pulongest (dwp_file->cus->version),
13327 pulongest (dwp_file->tus->version), dwp_name.c_str ());
13331 dwp_file->version = dwp_file->cus->version;
13332 else if (dwp_file->tus)
13333 dwp_file->version = dwp_file->tus->version;
13335 dwp_file->version = 2;
13337 if (dwp_file->version == 2)
13338 bfd_map_over_sections (dwp_file->dbfd, dwarf2_locate_v2_dwp_sections,
13341 dwp_file->loaded_cus = allocate_dwp_loaded_cutus_table (objfile);
13342 dwp_file->loaded_tus = allocate_dwp_loaded_cutus_table (objfile);
13344 if (dwarf_read_debug)
13346 fprintf_unfiltered (gdb_stdlog, "DWP file found: %s\n", dwp_file->name);
13347 fprintf_unfiltered (gdb_stdlog,
13348 " %s CUs, %s TUs\n",
13349 pulongest (dwp_file->cus ? dwp_file->cus->nr_units : 0),
13350 pulongest (dwp_file->tus ? dwp_file->tus->nr_units : 0));
13356 /* Wrapper around open_and_init_dwp_file, only open it once. */
13358 static struct dwp_file *
13359 get_dwp_file (struct dwarf2_per_objfile *dwarf2_per_objfile)
13361 if (! dwarf2_per_objfile->dwp_checked)
13363 dwarf2_per_objfile->dwp_file
13364 = open_and_init_dwp_file (dwarf2_per_objfile);
13365 dwarf2_per_objfile->dwp_checked = 1;
13367 return dwarf2_per_objfile->dwp_file;
13370 /* Subroutine of lookup_dwo_comp_unit, lookup_dwo_type_unit.
13371 Look up the CU/TU with signature SIGNATURE, either in DWO file DWO_NAME
13372 or in the DWP file for the objfile, referenced by THIS_UNIT.
13373 If non-NULL, comp_dir is the DW_AT_comp_dir attribute.
13374 IS_DEBUG_TYPES is non-zero if reading a TU, otherwise read a CU.
13376 This is called, for example, when wanting to read a variable with a
13377 complex location. Therefore we don't want to do file i/o for every call.
13378 Therefore we don't want to look for a DWO file on every call.
13379 Therefore we first see if we've already seen SIGNATURE in a DWP file,
13380 then we check if we've already seen DWO_NAME, and only THEN do we check
13383 The result is a pointer to the dwo_unit object or NULL if we didn't find it
13384 (dwo_id mismatch or couldn't find the DWO/DWP file). */
13386 static struct dwo_unit *
13387 lookup_dwo_cutu (struct dwarf2_per_cu_data *this_unit,
13388 const char *dwo_name, const char *comp_dir,
13389 ULONGEST signature, int is_debug_types)
13391 struct dwarf2_per_objfile *dwarf2_per_objfile = this_unit->dwarf2_per_objfile;
13392 struct objfile *objfile = dwarf2_per_objfile->objfile;
13393 const char *kind = is_debug_types ? "TU" : "CU";
13394 void **dwo_file_slot;
13395 struct dwo_file *dwo_file;
13396 struct dwp_file *dwp_file;
13398 /* First see if there's a DWP file.
13399 If we have a DWP file but didn't find the DWO inside it, don't
13400 look for the original DWO file. It makes gdb behave differently
13401 depending on whether one is debugging in the build tree. */
13403 dwp_file = get_dwp_file (dwarf2_per_objfile);
13404 if (dwp_file != NULL)
13406 const struct dwp_hash_table *dwp_htab =
13407 is_debug_types ? dwp_file->tus : dwp_file->cus;
13409 if (dwp_htab != NULL)
13411 struct dwo_unit *dwo_cutu =
13412 lookup_dwo_unit_in_dwp (dwarf2_per_objfile, dwp_file, comp_dir,
13413 signature, is_debug_types);
13415 if (dwo_cutu != NULL)
13417 if (dwarf_read_debug)
13419 fprintf_unfiltered (gdb_stdlog,
13420 "Virtual DWO %s %s found: @%s\n",
13421 kind, hex_string (signature),
13422 host_address_to_string (dwo_cutu));
13430 /* No DWP file, look for the DWO file. */
13432 dwo_file_slot = lookup_dwo_file_slot (dwarf2_per_objfile,
13433 dwo_name, comp_dir);
13434 if (*dwo_file_slot == NULL)
13436 /* Read in the file and build a table of the CUs/TUs it contains. */
13437 *dwo_file_slot = open_and_init_dwo_file (this_unit, dwo_name, comp_dir);
13439 /* NOTE: This will be NULL if unable to open the file. */
13440 dwo_file = (struct dwo_file *) *dwo_file_slot;
13442 if (dwo_file != NULL)
13444 struct dwo_unit *dwo_cutu = NULL;
13446 if (is_debug_types && dwo_file->tus)
13448 struct dwo_unit find_dwo_cutu;
13450 memset (&find_dwo_cutu, 0, sizeof (find_dwo_cutu));
13451 find_dwo_cutu.signature = signature;
13453 = (struct dwo_unit *) htab_find (dwo_file->tus, &find_dwo_cutu);
13455 else if (!is_debug_types && dwo_file->cus)
13457 struct dwo_unit find_dwo_cutu;
13459 memset (&find_dwo_cutu, 0, sizeof (find_dwo_cutu));
13460 find_dwo_cutu.signature = signature;
13461 dwo_cutu = (struct dwo_unit *)htab_find (dwo_file->cus,
13465 if (dwo_cutu != NULL)
13467 if (dwarf_read_debug)
13469 fprintf_unfiltered (gdb_stdlog, "DWO %s %s(%s) found: @%s\n",
13470 kind, dwo_name, hex_string (signature),
13471 host_address_to_string (dwo_cutu));
13478 /* We didn't find it. This could mean a dwo_id mismatch, or
13479 someone deleted the DWO/DWP file, or the search path isn't set up
13480 correctly to find the file. */
13482 if (dwarf_read_debug)
13484 fprintf_unfiltered (gdb_stdlog, "DWO %s %s(%s) not found\n",
13485 kind, dwo_name, hex_string (signature));
13488 /* This is a warning and not a complaint because it can be caused by
13489 pilot error (e.g., user accidentally deleting the DWO). */
13491 /* Print the name of the DWP file if we looked there, helps the user
13492 better diagnose the problem. */
13493 std::string dwp_text;
13495 if (dwp_file != NULL)
13496 dwp_text = string_printf (" [in DWP file %s]",
13497 lbasename (dwp_file->name));
13499 warning (_("Could not find DWO %s %s(%s)%s referenced by %s at offset %s"
13500 " [in module %s]"),
13501 kind, dwo_name, hex_string (signature),
13503 this_unit->is_debug_types ? "TU" : "CU",
13504 sect_offset_str (this_unit->sect_off), objfile_name (objfile));
13509 /* Lookup the DWO CU DWO_NAME/SIGNATURE referenced from THIS_CU.
13510 See lookup_dwo_cutu_unit for details. */
13512 static struct dwo_unit *
13513 lookup_dwo_comp_unit (struct dwarf2_per_cu_data *this_cu,
13514 const char *dwo_name, const char *comp_dir,
13515 ULONGEST signature)
13517 return lookup_dwo_cutu (this_cu, dwo_name, comp_dir, signature, 0);
13520 /* Lookup the DWO TU DWO_NAME/SIGNATURE referenced from THIS_TU.
13521 See lookup_dwo_cutu_unit for details. */
13523 static struct dwo_unit *
13524 lookup_dwo_type_unit (struct signatured_type *this_tu,
13525 const char *dwo_name, const char *comp_dir)
13527 return lookup_dwo_cutu (&this_tu->per_cu, dwo_name, comp_dir, this_tu->signature, 1);
13530 /* Traversal function for queue_and_load_all_dwo_tus. */
13533 queue_and_load_dwo_tu (void **slot, void *info)
13535 struct dwo_unit *dwo_unit = (struct dwo_unit *) *slot;
13536 struct dwarf2_per_cu_data *per_cu = (struct dwarf2_per_cu_data *) info;
13537 ULONGEST signature = dwo_unit->signature;
13538 struct signatured_type *sig_type =
13539 lookup_dwo_signatured_type (per_cu->cu, signature);
13541 if (sig_type != NULL)
13543 struct dwarf2_per_cu_data *sig_cu = &sig_type->per_cu;
13545 /* We pass NULL for DEPENDENT_CU because we don't yet know if there's
13546 a real dependency of PER_CU on SIG_TYPE. That is detected later
13547 while processing PER_CU. */
13548 if (maybe_queue_comp_unit (NULL, sig_cu, per_cu->cu->language))
13549 load_full_type_unit (sig_cu);
13550 VEC_safe_push (dwarf2_per_cu_ptr, per_cu->imported_symtabs, sig_cu);
13556 /* Queue all TUs contained in the DWO of PER_CU to be read in.
13557 The DWO may have the only definition of the type, though it may not be
13558 referenced anywhere in PER_CU. Thus we have to load *all* its TUs.
13559 http://sourceware.org/bugzilla/show_bug.cgi?id=15021 */
13562 queue_and_load_all_dwo_tus (struct dwarf2_per_cu_data *per_cu)
13564 struct dwo_unit *dwo_unit;
13565 struct dwo_file *dwo_file;
13567 gdb_assert (!per_cu->is_debug_types);
13568 gdb_assert (get_dwp_file (per_cu->dwarf2_per_objfile) == NULL);
13569 gdb_assert (per_cu->cu != NULL);
13571 dwo_unit = per_cu->cu->dwo_unit;
13572 gdb_assert (dwo_unit != NULL);
13574 dwo_file = dwo_unit->dwo_file;
13575 if (dwo_file->tus != NULL)
13576 htab_traverse_noresize (dwo_file->tus, queue_and_load_dwo_tu, per_cu);
13579 /* Free all resources associated with DWO_FILE.
13580 Close the DWO file and munmap the sections.
13581 All memory should be on the objfile obstack. */
13584 free_dwo_file (struct dwo_file *dwo_file, struct objfile *objfile)
13587 /* Note: dbfd is NULL for virtual DWO files. */
13588 gdb_bfd_unref (dwo_file->dbfd);
13590 VEC_free (dwarf2_section_info_def, dwo_file->sections.types);
13593 /* Wrapper for free_dwo_file for use in cleanups. */
13596 free_dwo_file_cleanup (void *arg)
13598 struct free_dwo_file_cleanup_data *data
13599 = (struct free_dwo_file_cleanup_data *) arg;
13600 struct objfile *objfile = data->dwarf2_per_objfile->objfile;
13602 free_dwo_file (data->dwo_file, objfile);
13607 /* Traversal function for free_dwo_files. */
13610 free_dwo_file_from_slot (void **slot, void *info)
13612 struct dwo_file *dwo_file = (struct dwo_file *) *slot;
13613 struct objfile *objfile = (struct objfile *) info;
13615 free_dwo_file (dwo_file, objfile);
13620 /* Free all resources associated with DWO_FILES. */
13623 free_dwo_files (htab_t dwo_files, struct objfile *objfile)
13625 htab_traverse_noresize (dwo_files, free_dwo_file_from_slot, objfile);
13628 /* Read in various DIEs. */
13630 /* DW_AT_abstract_origin inherits whole DIEs (not just their attributes).
13631 Inherit only the children of the DW_AT_abstract_origin DIE not being
13632 already referenced by DW_AT_abstract_origin from the children of the
13636 inherit_abstract_dies (struct die_info *die, struct dwarf2_cu *cu)
13638 struct die_info *child_die;
13639 sect_offset *offsetp;
13640 /* Parent of DIE - referenced by DW_AT_abstract_origin. */
13641 struct die_info *origin_die;
13642 /* Iterator of the ORIGIN_DIE children. */
13643 struct die_info *origin_child_die;
13644 struct attribute *attr;
13645 struct dwarf2_cu *origin_cu;
13646 struct pending **origin_previous_list_in_scope;
13648 attr = dwarf2_attr (die, DW_AT_abstract_origin, cu);
13652 /* Note that following die references may follow to a die in a
13656 origin_die = follow_die_ref (die, attr, &origin_cu);
13658 /* We're inheriting ORIGIN's children into the scope we'd put DIE's
13660 origin_previous_list_in_scope = origin_cu->list_in_scope;
13661 origin_cu->list_in_scope = cu->list_in_scope;
13663 if (die->tag != origin_die->tag
13664 && !(die->tag == DW_TAG_inlined_subroutine
13665 && origin_die->tag == DW_TAG_subprogram))
13666 complaint (&symfile_complaints,
13667 _("DIE %s and its abstract origin %s have different tags"),
13668 sect_offset_str (die->sect_off),
13669 sect_offset_str (origin_die->sect_off));
13671 std::vector<sect_offset> offsets;
13673 for (child_die = die->child;
13674 child_die && child_die->tag;
13675 child_die = sibling_die (child_die))
13677 struct die_info *child_origin_die;
13678 struct dwarf2_cu *child_origin_cu;
13680 /* We are trying to process concrete instance entries:
13681 DW_TAG_call_site DIEs indeed have a DW_AT_abstract_origin tag, but
13682 it's not relevant to our analysis here. i.e. detecting DIEs that are
13683 present in the abstract instance but not referenced in the concrete
13685 if (child_die->tag == DW_TAG_call_site
13686 || child_die->tag == DW_TAG_GNU_call_site)
13689 /* For each CHILD_DIE, find the corresponding child of
13690 ORIGIN_DIE. If there is more than one layer of
13691 DW_AT_abstract_origin, follow them all; there shouldn't be,
13692 but GCC versions at least through 4.4 generate this (GCC PR
13694 child_origin_die = child_die;
13695 child_origin_cu = cu;
13698 attr = dwarf2_attr (child_origin_die, DW_AT_abstract_origin,
13702 child_origin_die = follow_die_ref (child_origin_die, attr,
13706 /* According to DWARF3 3.3.8.2 #3 new entries without their abstract
13707 counterpart may exist. */
13708 if (child_origin_die != child_die)
13710 if (child_die->tag != child_origin_die->tag
13711 && !(child_die->tag == DW_TAG_inlined_subroutine
13712 && child_origin_die->tag == DW_TAG_subprogram))
13713 complaint (&symfile_complaints,
13714 _("Child DIE %s and its abstract origin %s have "
13716 sect_offset_str (child_die->sect_off),
13717 sect_offset_str (child_origin_die->sect_off));
13718 if (child_origin_die->parent != origin_die)
13719 complaint (&symfile_complaints,
13720 _("Child DIE %s and its abstract origin %s have "
13721 "different parents"),
13722 sect_offset_str (child_die->sect_off),
13723 sect_offset_str (child_origin_die->sect_off));
13725 offsets.push_back (child_origin_die->sect_off);
13728 std::sort (offsets.begin (), offsets.end ());
13729 sect_offset *offsets_end = offsets.data () + offsets.size ();
13730 for (offsetp = offsets.data () + 1; offsetp < offsets_end; offsetp++)
13731 if (offsetp[-1] == *offsetp)
13732 complaint (&symfile_complaints,
13733 _("Multiple children of DIE %s refer "
13734 "to DIE %s as their abstract origin"),
13735 sect_offset_str (die->sect_off), sect_offset_str (*offsetp));
13737 offsetp = offsets.data ();
13738 origin_child_die = origin_die->child;
13739 while (origin_child_die && origin_child_die->tag)
13741 /* Is ORIGIN_CHILD_DIE referenced by any of the DIE children? */
13742 while (offsetp < offsets_end
13743 && *offsetp < origin_child_die->sect_off)
13745 if (offsetp >= offsets_end
13746 || *offsetp > origin_child_die->sect_off)
13748 /* Found that ORIGIN_CHILD_DIE is really not referenced.
13749 Check whether we're already processing ORIGIN_CHILD_DIE.
13750 This can happen with mutually referenced abstract_origins.
13752 if (!origin_child_die->in_process)
13753 process_die (origin_child_die, origin_cu);
13755 origin_child_die = sibling_die (origin_child_die);
13757 origin_cu->list_in_scope = origin_previous_list_in_scope;
13761 read_func_scope (struct die_info *die, struct dwarf2_cu *cu)
13763 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
13764 struct gdbarch *gdbarch = get_objfile_arch (objfile);
13765 struct context_stack *newobj;
13768 struct die_info *child_die;
13769 struct attribute *attr, *call_line, *call_file;
13771 CORE_ADDR baseaddr;
13772 struct block *block;
13773 int inlined_func = (die->tag == DW_TAG_inlined_subroutine);
13774 std::vector<struct symbol *> template_args;
13775 struct template_symbol *templ_func = NULL;
13779 /* If we do not have call site information, we can't show the
13780 caller of this inlined function. That's too confusing, so
13781 only use the scope for local variables. */
13782 call_line = dwarf2_attr (die, DW_AT_call_line, cu);
13783 call_file = dwarf2_attr (die, DW_AT_call_file, cu);
13784 if (call_line == NULL || call_file == NULL)
13786 read_lexical_block_scope (die, cu);
13791 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
13793 name = dwarf2_name (die, cu);
13795 /* Ignore functions with missing or empty names. These are actually
13796 illegal according to the DWARF standard. */
13799 complaint (&symfile_complaints,
13800 _("missing name for subprogram DIE at %s"),
13801 sect_offset_str (die->sect_off));
13805 /* Ignore functions with missing or invalid low and high pc attributes. */
13806 if (dwarf2_get_pc_bounds (die, &lowpc, &highpc, cu, NULL)
13807 <= PC_BOUNDS_INVALID)
13809 attr = dwarf2_attr (die, DW_AT_external, cu);
13810 if (!attr || !DW_UNSND (attr))
13811 complaint (&symfile_complaints,
13812 _("cannot get low and high bounds "
13813 "for subprogram DIE at %s"),
13814 sect_offset_str (die->sect_off));
13818 lowpc = gdbarch_adjust_dwarf2_addr (gdbarch, lowpc + baseaddr);
13819 highpc = gdbarch_adjust_dwarf2_addr (gdbarch, highpc + baseaddr);
13821 /* If we have any template arguments, then we must allocate a
13822 different sort of symbol. */
13823 for (child_die = die->child; child_die; child_die = sibling_die (child_die))
13825 if (child_die->tag == DW_TAG_template_type_param
13826 || child_die->tag == DW_TAG_template_value_param)
13828 templ_func = allocate_template_symbol (objfile);
13829 templ_func->subclass = SYMBOL_TEMPLATE;
13834 newobj = push_context (0, lowpc);
13835 newobj->name = new_symbol (die, read_type_die (die, cu), cu,
13836 (struct symbol *) templ_func);
13838 /* If there is a location expression for DW_AT_frame_base, record
13840 attr = dwarf2_attr (die, DW_AT_frame_base, cu);
13842 dwarf2_symbol_mark_computed (attr, newobj->name, cu, 1);
13844 /* If there is a location for the static link, record it. */
13845 newobj->static_link = NULL;
13846 attr = dwarf2_attr (die, DW_AT_static_link, cu);
13849 newobj->static_link
13850 = XOBNEW (&objfile->objfile_obstack, struct dynamic_prop);
13851 attr_to_dynamic_prop (attr, die, cu, newobj->static_link);
13854 cu->list_in_scope = &local_symbols;
13856 if (die->child != NULL)
13858 child_die = die->child;
13859 while (child_die && child_die->tag)
13861 if (child_die->tag == DW_TAG_template_type_param
13862 || child_die->tag == DW_TAG_template_value_param)
13864 struct symbol *arg = new_symbol (child_die, NULL, cu);
13867 template_args.push_back (arg);
13870 process_die (child_die, cu);
13871 child_die = sibling_die (child_die);
13875 inherit_abstract_dies (die, cu);
13877 /* If we have a DW_AT_specification, we might need to import using
13878 directives from the context of the specification DIE. See the
13879 comment in determine_prefix. */
13880 if (cu->language == language_cplus
13881 && dwarf2_attr (die, DW_AT_specification, cu))
13883 struct dwarf2_cu *spec_cu = cu;
13884 struct die_info *spec_die = die_specification (die, &spec_cu);
13888 child_die = spec_die->child;
13889 while (child_die && child_die->tag)
13891 if (child_die->tag == DW_TAG_imported_module)
13892 process_die (child_die, spec_cu);
13893 child_die = sibling_die (child_die);
13896 /* In some cases, GCC generates specification DIEs that
13897 themselves contain DW_AT_specification attributes. */
13898 spec_die = die_specification (spec_die, &spec_cu);
13902 newobj = pop_context ();
13903 /* Make a block for the local symbols within. */
13904 block = finish_block (newobj->name, &local_symbols, newobj->old_blocks,
13905 newobj->static_link, lowpc, highpc);
13907 /* For C++, set the block's scope. */
13908 if ((cu->language == language_cplus
13909 || cu->language == language_fortran
13910 || cu->language == language_d
13911 || cu->language == language_rust)
13912 && cu->processing_has_namespace_info)
13913 block_set_scope (block, determine_prefix (die, cu),
13914 &objfile->objfile_obstack);
13916 /* If we have address ranges, record them. */
13917 dwarf2_record_block_ranges (die, block, baseaddr, cu);
13919 gdbarch_make_symbol_special (gdbarch, newobj->name, objfile);
13921 /* Attach template arguments to function. */
13922 if (!template_args.empty ())
13924 gdb_assert (templ_func != NULL);
13926 templ_func->n_template_arguments = template_args.size ();
13927 templ_func->template_arguments
13928 = XOBNEWVEC (&objfile->objfile_obstack, struct symbol *,
13929 templ_func->n_template_arguments);
13930 memcpy (templ_func->template_arguments,
13931 template_args.data (),
13932 (templ_func->n_template_arguments * sizeof (struct symbol *)));
13935 /* In C++, we can have functions nested inside functions (e.g., when
13936 a function declares a class that has methods). This means that
13937 when we finish processing a function scope, we may need to go
13938 back to building a containing block's symbol lists. */
13939 local_symbols = newobj->locals;
13940 local_using_directives = newobj->local_using_directives;
13942 /* If we've finished processing a top-level function, subsequent
13943 symbols go in the file symbol list. */
13944 if (outermost_context_p ())
13945 cu->list_in_scope = &file_symbols;
13948 /* Process all the DIES contained within a lexical block scope. Start
13949 a new scope, process the dies, and then close the scope. */
13952 read_lexical_block_scope (struct die_info *die, struct dwarf2_cu *cu)
13954 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
13955 struct gdbarch *gdbarch = get_objfile_arch (objfile);
13956 struct context_stack *newobj;
13957 CORE_ADDR lowpc, highpc;
13958 struct die_info *child_die;
13959 CORE_ADDR baseaddr;
13961 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
13963 /* Ignore blocks with missing or invalid low and high pc attributes. */
13964 /* ??? Perhaps consider discontiguous blocks defined by DW_AT_ranges
13965 as multiple lexical blocks? Handling children in a sane way would
13966 be nasty. Might be easier to properly extend generic blocks to
13967 describe ranges. */
13968 switch (dwarf2_get_pc_bounds (die, &lowpc, &highpc, cu, NULL))
13970 case PC_BOUNDS_NOT_PRESENT:
13971 /* DW_TAG_lexical_block has no attributes, process its children as if
13972 there was no wrapping by that DW_TAG_lexical_block.
13973 GCC does no longer produces such DWARF since GCC r224161. */
13974 for (child_die = die->child;
13975 child_die != NULL && child_die->tag;
13976 child_die = sibling_die (child_die))
13977 process_die (child_die, cu);
13979 case PC_BOUNDS_INVALID:
13982 lowpc = gdbarch_adjust_dwarf2_addr (gdbarch, lowpc + baseaddr);
13983 highpc = gdbarch_adjust_dwarf2_addr (gdbarch, highpc + baseaddr);
13985 push_context (0, lowpc);
13986 if (die->child != NULL)
13988 child_die = die->child;
13989 while (child_die && child_die->tag)
13991 process_die (child_die, cu);
13992 child_die = sibling_die (child_die);
13995 inherit_abstract_dies (die, cu);
13996 newobj = pop_context ();
13998 if (local_symbols != NULL || local_using_directives != NULL)
14000 struct block *block
14001 = finish_block (0, &local_symbols, newobj->old_blocks, NULL,
14002 newobj->start_addr, highpc);
14004 /* Note that recording ranges after traversing children, as we
14005 do here, means that recording a parent's ranges entails
14006 walking across all its children's ranges as they appear in
14007 the address map, which is quadratic behavior.
14009 It would be nicer to record the parent's ranges before
14010 traversing its children, simply overriding whatever you find
14011 there. But since we don't even decide whether to create a
14012 block until after we've traversed its children, that's hard
14014 dwarf2_record_block_ranges (die, block, baseaddr, cu);
14016 local_symbols = newobj->locals;
14017 local_using_directives = newobj->local_using_directives;
14020 /* Read in DW_TAG_call_site and insert it to CU->call_site_htab. */
14023 read_call_site_scope (struct die_info *die, struct dwarf2_cu *cu)
14025 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
14026 struct gdbarch *gdbarch = get_objfile_arch (objfile);
14027 CORE_ADDR pc, baseaddr;
14028 struct attribute *attr;
14029 struct call_site *call_site, call_site_local;
14032 struct die_info *child_die;
14034 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
14036 attr = dwarf2_attr (die, DW_AT_call_return_pc, cu);
14039 /* This was a pre-DWARF-5 GNU extension alias
14040 for DW_AT_call_return_pc. */
14041 attr = dwarf2_attr (die, DW_AT_low_pc, cu);
14045 complaint (&symfile_complaints,
14046 _("missing DW_AT_call_return_pc for DW_TAG_call_site "
14047 "DIE %s [in module %s]"),
14048 sect_offset_str (die->sect_off), objfile_name (objfile));
14051 pc = attr_value_as_address (attr) + baseaddr;
14052 pc = gdbarch_adjust_dwarf2_addr (gdbarch, pc);
14054 if (cu->call_site_htab == NULL)
14055 cu->call_site_htab = htab_create_alloc_ex (16, core_addr_hash, core_addr_eq,
14056 NULL, &objfile->objfile_obstack,
14057 hashtab_obstack_allocate, NULL);
14058 call_site_local.pc = pc;
14059 slot = htab_find_slot (cu->call_site_htab, &call_site_local, INSERT);
14062 complaint (&symfile_complaints,
14063 _("Duplicate PC %s for DW_TAG_call_site "
14064 "DIE %s [in module %s]"),
14065 paddress (gdbarch, pc), sect_offset_str (die->sect_off),
14066 objfile_name (objfile));
14070 /* Count parameters at the caller. */
14073 for (child_die = die->child; child_die && child_die->tag;
14074 child_die = sibling_die (child_die))
14076 if (child_die->tag != DW_TAG_call_site_parameter
14077 && child_die->tag != DW_TAG_GNU_call_site_parameter)
14079 complaint (&symfile_complaints,
14080 _("Tag %d is not DW_TAG_call_site_parameter in "
14081 "DW_TAG_call_site child DIE %s [in module %s]"),
14082 child_die->tag, sect_offset_str (child_die->sect_off),
14083 objfile_name (objfile));
14091 = ((struct call_site *)
14092 obstack_alloc (&objfile->objfile_obstack,
14093 sizeof (*call_site)
14094 + (sizeof (*call_site->parameter) * (nparams - 1))));
14096 memset (call_site, 0, sizeof (*call_site) - sizeof (*call_site->parameter));
14097 call_site->pc = pc;
14099 if (dwarf2_flag_true_p (die, DW_AT_call_tail_call, cu)
14100 || dwarf2_flag_true_p (die, DW_AT_GNU_tail_call, cu))
14102 struct die_info *func_die;
14104 /* Skip also over DW_TAG_inlined_subroutine. */
14105 for (func_die = die->parent;
14106 func_die && func_die->tag != DW_TAG_subprogram
14107 && func_die->tag != DW_TAG_subroutine_type;
14108 func_die = func_die->parent);
14110 /* DW_AT_call_all_calls is a superset
14111 of DW_AT_call_all_tail_calls. */
14113 && !dwarf2_flag_true_p (func_die, DW_AT_call_all_calls, cu)
14114 && !dwarf2_flag_true_p (func_die, DW_AT_GNU_all_call_sites, cu)
14115 && !dwarf2_flag_true_p (func_die, DW_AT_call_all_tail_calls, cu)
14116 && !dwarf2_flag_true_p (func_die, DW_AT_GNU_all_tail_call_sites, cu))
14118 /* TYPE_TAIL_CALL_LIST is not interesting in functions where it is
14119 not complete. But keep CALL_SITE for look ups via call_site_htab,
14120 both the initial caller containing the real return address PC and
14121 the final callee containing the current PC of a chain of tail
14122 calls do not need to have the tail call list complete. But any
14123 function candidate for a virtual tail call frame searched via
14124 TYPE_TAIL_CALL_LIST must have the tail call list complete to be
14125 determined unambiguously. */
14129 struct type *func_type = NULL;
14132 func_type = get_die_type (func_die, cu);
14133 if (func_type != NULL)
14135 gdb_assert (TYPE_CODE (func_type) == TYPE_CODE_FUNC);
14137 /* Enlist this call site to the function. */
14138 call_site->tail_call_next = TYPE_TAIL_CALL_LIST (func_type);
14139 TYPE_TAIL_CALL_LIST (func_type) = call_site;
14142 complaint (&symfile_complaints,
14143 _("Cannot find function owning DW_TAG_call_site "
14144 "DIE %s [in module %s]"),
14145 sect_offset_str (die->sect_off), objfile_name (objfile));
14149 attr = dwarf2_attr (die, DW_AT_call_target, cu);
14151 attr = dwarf2_attr (die, DW_AT_GNU_call_site_target, cu);
14153 attr = dwarf2_attr (die, DW_AT_call_origin, cu);
14156 /* This was a pre-DWARF-5 GNU extension alias for DW_AT_call_origin. */
14157 attr = dwarf2_attr (die, DW_AT_abstract_origin, cu);
14159 SET_FIELD_DWARF_BLOCK (call_site->target, NULL);
14160 if (!attr || (attr_form_is_block (attr) && DW_BLOCK (attr)->size == 0))
14161 /* Keep NULL DWARF_BLOCK. */;
14162 else if (attr_form_is_block (attr))
14164 struct dwarf2_locexpr_baton *dlbaton;
14166 dlbaton = XOBNEW (&objfile->objfile_obstack, struct dwarf2_locexpr_baton);
14167 dlbaton->data = DW_BLOCK (attr)->data;
14168 dlbaton->size = DW_BLOCK (attr)->size;
14169 dlbaton->per_cu = cu->per_cu;
14171 SET_FIELD_DWARF_BLOCK (call_site->target, dlbaton);
14173 else if (attr_form_is_ref (attr))
14175 struct dwarf2_cu *target_cu = cu;
14176 struct die_info *target_die;
14178 target_die = follow_die_ref (die, attr, &target_cu);
14179 gdb_assert (target_cu->per_cu->dwarf2_per_objfile->objfile == objfile);
14180 if (die_is_declaration (target_die, target_cu))
14182 const char *target_physname;
14184 /* Prefer the mangled name; otherwise compute the demangled one. */
14185 target_physname = dw2_linkage_name (target_die, target_cu);
14186 if (target_physname == NULL)
14187 target_physname = dwarf2_physname (NULL, target_die, target_cu);
14188 if (target_physname == NULL)
14189 complaint (&symfile_complaints,
14190 _("DW_AT_call_target target DIE has invalid "
14191 "physname, for referencing DIE %s [in module %s]"),
14192 sect_offset_str (die->sect_off), objfile_name (objfile));
14194 SET_FIELD_PHYSNAME (call_site->target, target_physname);
14200 /* DW_AT_entry_pc should be preferred. */
14201 if (dwarf2_get_pc_bounds (target_die, &lowpc, NULL, target_cu, NULL)
14202 <= PC_BOUNDS_INVALID)
14203 complaint (&symfile_complaints,
14204 _("DW_AT_call_target target DIE has invalid "
14205 "low pc, for referencing DIE %s [in module %s]"),
14206 sect_offset_str (die->sect_off), objfile_name (objfile));
14209 lowpc = gdbarch_adjust_dwarf2_addr (gdbarch, lowpc + baseaddr);
14210 SET_FIELD_PHYSADDR (call_site->target, lowpc);
14215 complaint (&symfile_complaints,
14216 _("DW_TAG_call_site DW_AT_call_target is neither "
14217 "block nor reference, for DIE %s [in module %s]"),
14218 sect_offset_str (die->sect_off), objfile_name (objfile));
14220 call_site->per_cu = cu->per_cu;
14222 for (child_die = die->child;
14223 child_die && child_die->tag;
14224 child_die = sibling_die (child_die))
14226 struct call_site_parameter *parameter;
14227 struct attribute *loc, *origin;
14229 if (child_die->tag != DW_TAG_call_site_parameter
14230 && child_die->tag != DW_TAG_GNU_call_site_parameter)
14232 /* Already printed the complaint above. */
14236 gdb_assert (call_site->parameter_count < nparams);
14237 parameter = &call_site->parameter[call_site->parameter_count];
14239 /* DW_AT_location specifies the register number or DW_AT_abstract_origin
14240 specifies DW_TAG_formal_parameter. Value of the data assumed for the
14241 register is contained in DW_AT_call_value. */
14243 loc = dwarf2_attr (child_die, DW_AT_location, cu);
14244 origin = dwarf2_attr (child_die, DW_AT_call_parameter, cu);
14245 if (origin == NULL)
14247 /* This was a pre-DWARF-5 GNU extension alias
14248 for DW_AT_call_parameter. */
14249 origin = dwarf2_attr (child_die, DW_AT_abstract_origin, cu);
14251 if (loc == NULL && origin != NULL && attr_form_is_ref (origin))
14253 parameter->kind = CALL_SITE_PARAMETER_PARAM_OFFSET;
14255 sect_offset sect_off
14256 = (sect_offset) dwarf2_get_ref_die_offset (origin);
14257 if (!offset_in_cu_p (&cu->header, sect_off))
14259 /* As DW_OP_GNU_parameter_ref uses CU-relative offset this
14260 binding can be done only inside one CU. Such referenced DIE
14261 therefore cannot be even moved to DW_TAG_partial_unit. */
14262 complaint (&symfile_complaints,
14263 _("DW_AT_call_parameter offset is not in CU for "
14264 "DW_TAG_call_site child DIE %s [in module %s]"),
14265 sect_offset_str (child_die->sect_off),
14266 objfile_name (objfile));
14269 parameter->u.param_cu_off
14270 = (cu_offset) (sect_off - cu->header.sect_off);
14272 else if (loc == NULL || origin != NULL || !attr_form_is_block (loc))
14274 complaint (&symfile_complaints,
14275 _("No DW_FORM_block* DW_AT_location for "
14276 "DW_TAG_call_site child DIE %s [in module %s]"),
14277 sect_offset_str (child_die->sect_off), objfile_name (objfile));
14282 parameter->u.dwarf_reg = dwarf_block_to_dwarf_reg
14283 (DW_BLOCK (loc)->data, &DW_BLOCK (loc)->data[DW_BLOCK (loc)->size]);
14284 if (parameter->u.dwarf_reg != -1)
14285 parameter->kind = CALL_SITE_PARAMETER_DWARF_REG;
14286 else if (dwarf_block_to_sp_offset (gdbarch, DW_BLOCK (loc)->data,
14287 &DW_BLOCK (loc)->data[DW_BLOCK (loc)->size],
14288 ¶meter->u.fb_offset))
14289 parameter->kind = CALL_SITE_PARAMETER_FB_OFFSET;
14292 complaint (&symfile_complaints,
14293 _("Only single DW_OP_reg or DW_OP_fbreg is supported "
14294 "for DW_FORM_block* DW_AT_location is supported for "
14295 "DW_TAG_call_site child DIE %s "
14297 sect_offset_str (child_die->sect_off),
14298 objfile_name (objfile));
14303 attr = dwarf2_attr (child_die, DW_AT_call_value, cu);
14305 attr = dwarf2_attr (child_die, DW_AT_GNU_call_site_value, cu);
14306 if (!attr_form_is_block (attr))
14308 complaint (&symfile_complaints,
14309 _("No DW_FORM_block* DW_AT_call_value for "
14310 "DW_TAG_call_site child DIE %s [in module %s]"),
14311 sect_offset_str (child_die->sect_off),
14312 objfile_name (objfile));
14315 parameter->value = DW_BLOCK (attr)->data;
14316 parameter->value_size = DW_BLOCK (attr)->size;
14318 /* Parameters are not pre-cleared by memset above. */
14319 parameter->data_value = NULL;
14320 parameter->data_value_size = 0;
14321 call_site->parameter_count++;
14323 attr = dwarf2_attr (child_die, DW_AT_call_data_value, cu);
14325 attr = dwarf2_attr (child_die, DW_AT_GNU_call_site_data_value, cu);
14328 if (!attr_form_is_block (attr))
14329 complaint (&symfile_complaints,
14330 _("No DW_FORM_block* DW_AT_call_data_value for "
14331 "DW_TAG_call_site child DIE %s [in module %s]"),
14332 sect_offset_str (child_die->sect_off),
14333 objfile_name (objfile));
14336 parameter->data_value = DW_BLOCK (attr)->data;
14337 parameter->data_value_size = DW_BLOCK (attr)->size;
14343 /* Helper function for read_variable. If DIE represents a virtual
14344 table, then return the type of the concrete object that is
14345 associated with the virtual table. Otherwise, return NULL. */
14347 static struct type *
14348 rust_containing_type (struct die_info *die, struct dwarf2_cu *cu)
14350 struct attribute *attr = dwarf2_attr (die, DW_AT_type, cu);
14354 /* Find the type DIE. */
14355 struct die_info *type_die = NULL;
14356 struct dwarf2_cu *type_cu = cu;
14358 if (attr_form_is_ref (attr))
14359 type_die = follow_die_ref (die, attr, &type_cu);
14360 if (type_die == NULL)
14363 if (dwarf2_attr (type_die, DW_AT_containing_type, type_cu) == NULL)
14365 return die_containing_type (type_die, type_cu);
14368 /* Read a variable (DW_TAG_variable) DIE and create a new symbol. */
14371 read_variable (struct die_info *die, struct dwarf2_cu *cu)
14373 struct rust_vtable_symbol *storage = NULL;
14375 if (cu->language == language_rust)
14377 struct type *containing_type = rust_containing_type (die, cu);
14379 if (containing_type != NULL)
14381 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
14383 storage = OBSTACK_ZALLOC (&objfile->objfile_obstack,
14384 struct rust_vtable_symbol);
14385 initialize_objfile_symbol (storage);
14386 storage->concrete_type = containing_type;
14387 storage->subclass = SYMBOL_RUST_VTABLE;
14391 new_symbol (die, NULL, cu, storage);
14394 /* Call CALLBACK from DW_AT_ranges attribute value OFFSET
14395 reading .debug_rnglists.
14396 Callback's type should be:
14397 void (CORE_ADDR range_beginning, CORE_ADDR range_end)
14398 Return true if the attributes are present and valid, otherwise,
14401 template <typename Callback>
14403 dwarf2_rnglists_process (unsigned offset, struct dwarf2_cu *cu,
14404 Callback &&callback)
14406 struct dwarf2_per_objfile *dwarf2_per_objfile
14407 = cu->per_cu->dwarf2_per_objfile;
14408 struct objfile *objfile = dwarf2_per_objfile->objfile;
14409 bfd *obfd = objfile->obfd;
14410 /* Base address selection entry. */
14413 const gdb_byte *buffer;
14414 CORE_ADDR baseaddr;
14415 bool overflow = false;
14417 found_base = cu->base_known;
14418 base = cu->base_address;
14420 dwarf2_read_section (objfile, &dwarf2_per_objfile->rnglists);
14421 if (offset >= dwarf2_per_objfile->rnglists.size)
14423 complaint (&symfile_complaints,
14424 _("Offset %d out of bounds for DW_AT_ranges attribute"),
14428 buffer = dwarf2_per_objfile->rnglists.buffer + offset;
14430 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
14434 /* Initialize it due to a false compiler warning. */
14435 CORE_ADDR range_beginning = 0, range_end = 0;
14436 const gdb_byte *buf_end = (dwarf2_per_objfile->rnglists.buffer
14437 + dwarf2_per_objfile->rnglists.size);
14438 unsigned int bytes_read;
14440 if (buffer == buf_end)
14445 const auto rlet = static_cast<enum dwarf_range_list_entry>(*buffer++);
14448 case DW_RLE_end_of_list:
14450 case DW_RLE_base_address:
14451 if (buffer + cu->header.addr_size > buf_end)
14456 base = read_address (obfd, buffer, cu, &bytes_read);
14458 buffer += bytes_read;
14460 case DW_RLE_start_length:
14461 if (buffer + cu->header.addr_size > buf_end)
14466 range_beginning = read_address (obfd, buffer, cu, &bytes_read);
14467 buffer += bytes_read;
14468 range_end = (range_beginning
14469 + read_unsigned_leb128 (obfd, buffer, &bytes_read));
14470 buffer += bytes_read;
14471 if (buffer > buf_end)
14477 case DW_RLE_offset_pair:
14478 range_beginning = read_unsigned_leb128 (obfd, buffer, &bytes_read);
14479 buffer += bytes_read;
14480 if (buffer > buf_end)
14485 range_end = read_unsigned_leb128 (obfd, buffer, &bytes_read);
14486 buffer += bytes_read;
14487 if (buffer > buf_end)
14493 case DW_RLE_start_end:
14494 if (buffer + 2 * cu->header.addr_size > buf_end)
14499 range_beginning = read_address (obfd, buffer, cu, &bytes_read);
14500 buffer += bytes_read;
14501 range_end = read_address (obfd, buffer, cu, &bytes_read);
14502 buffer += bytes_read;
14505 complaint (&symfile_complaints,
14506 _("Invalid .debug_rnglists data (no base address)"));
14509 if (rlet == DW_RLE_end_of_list || overflow)
14511 if (rlet == DW_RLE_base_address)
14516 /* We have no valid base address for the ranges
14518 complaint (&symfile_complaints,
14519 _("Invalid .debug_rnglists data (no base address)"));
14523 if (range_beginning > range_end)
14525 /* Inverted range entries are invalid. */
14526 complaint (&symfile_complaints,
14527 _("Invalid .debug_rnglists data (inverted range)"));
14531 /* Empty range entries have no effect. */
14532 if (range_beginning == range_end)
14535 range_beginning += base;
14538 /* A not-uncommon case of bad debug info.
14539 Don't pollute the addrmap with bad data. */
14540 if (range_beginning + baseaddr == 0
14541 && !dwarf2_per_objfile->has_section_at_zero)
14543 complaint (&symfile_complaints,
14544 _(".debug_rnglists entry has start address of zero"
14545 " [in module %s]"), objfile_name (objfile));
14549 callback (range_beginning, range_end);
14554 complaint (&symfile_complaints,
14555 _("Offset %d is not terminated "
14556 "for DW_AT_ranges attribute"),
14564 /* Call CALLBACK from DW_AT_ranges attribute value OFFSET reading .debug_ranges.
14565 Callback's type should be:
14566 void (CORE_ADDR range_beginning, CORE_ADDR range_end)
14567 Return 1 if the attributes are present and valid, otherwise, return 0. */
14569 template <typename Callback>
14571 dwarf2_ranges_process (unsigned offset, struct dwarf2_cu *cu,
14572 Callback &&callback)
14574 struct dwarf2_per_objfile *dwarf2_per_objfile
14575 = cu->per_cu->dwarf2_per_objfile;
14576 struct objfile *objfile = dwarf2_per_objfile->objfile;
14577 struct comp_unit_head *cu_header = &cu->header;
14578 bfd *obfd = objfile->obfd;
14579 unsigned int addr_size = cu_header->addr_size;
14580 CORE_ADDR mask = ~(~(CORE_ADDR)1 << (addr_size * 8 - 1));
14581 /* Base address selection entry. */
14584 unsigned int dummy;
14585 const gdb_byte *buffer;
14586 CORE_ADDR baseaddr;
14588 if (cu_header->version >= 5)
14589 return dwarf2_rnglists_process (offset, cu, callback);
14591 found_base = cu->base_known;
14592 base = cu->base_address;
14594 dwarf2_read_section (objfile, &dwarf2_per_objfile->ranges);
14595 if (offset >= dwarf2_per_objfile->ranges.size)
14597 complaint (&symfile_complaints,
14598 _("Offset %d out of bounds for DW_AT_ranges attribute"),
14602 buffer = dwarf2_per_objfile->ranges.buffer + offset;
14604 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
14608 CORE_ADDR range_beginning, range_end;
14610 range_beginning = read_address (obfd, buffer, cu, &dummy);
14611 buffer += addr_size;
14612 range_end = read_address (obfd, buffer, cu, &dummy);
14613 buffer += addr_size;
14614 offset += 2 * addr_size;
14616 /* An end of list marker is a pair of zero addresses. */
14617 if (range_beginning == 0 && range_end == 0)
14618 /* Found the end of list entry. */
14621 /* Each base address selection entry is a pair of 2 values.
14622 The first is the largest possible address, the second is
14623 the base address. Check for a base address here. */
14624 if ((range_beginning & mask) == mask)
14626 /* If we found the largest possible address, then we already
14627 have the base address in range_end. */
14635 /* We have no valid base address for the ranges
14637 complaint (&symfile_complaints,
14638 _("Invalid .debug_ranges data (no base address)"));
14642 if (range_beginning > range_end)
14644 /* Inverted range entries are invalid. */
14645 complaint (&symfile_complaints,
14646 _("Invalid .debug_ranges data (inverted range)"));
14650 /* Empty range entries have no effect. */
14651 if (range_beginning == range_end)
14654 range_beginning += base;
14657 /* A not-uncommon case of bad debug info.
14658 Don't pollute the addrmap with bad data. */
14659 if (range_beginning + baseaddr == 0
14660 && !dwarf2_per_objfile->has_section_at_zero)
14662 complaint (&symfile_complaints,
14663 _(".debug_ranges entry has start address of zero"
14664 " [in module %s]"), objfile_name (objfile));
14668 callback (range_beginning, range_end);
14674 /* Get low and high pc attributes from DW_AT_ranges attribute value OFFSET.
14675 Return 1 if the attributes are present and valid, otherwise, return 0.
14676 If RANGES_PST is not NULL we should setup `objfile->psymtabs_addrmap'. */
14679 dwarf2_ranges_read (unsigned offset, CORE_ADDR *low_return,
14680 CORE_ADDR *high_return, struct dwarf2_cu *cu,
14681 struct partial_symtab *ranges_pst)
14683 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
14684 struct gdbarch *gdbarch = get_objfile_arch (objfile);
14685 const CORE_ADDR baseaddr = ANOFFSET (objfile->section_offsets,
14686 SECT_OFF_TEXT (objfile));
14689 CORE_ADDR high = 0;
14692 retval = dwarf2_ranges_process (offset, cu,
14693 [&] (CORE_ADDR range_beginning, CORE_ADDR range_end)
14695 if (ranges_pst != NULL)
14700 lowpc = gdbarch_adjust_dwarf2_addr (gdbarch,
14701 range_beginning + baseaddr);
14702 highpc = gdbarch_adjust_dwarf2_addr (gdbarch,
14703 range_end + baseaddr);
14704 addrmap_set_empty (objfile->psymtabs_addrmap, lowpc, highpc - 1,
14708 /* FIXME: This is recording everything as a low-high
14709 segment of consecutive addresses. We should have a
14710 data structure for discontiguous block ranges
14714 low = range_beginning;
14720 if (range_beginning < low)
14721 low = range_beginning;
14722 if (range_end > high)
14730 /* If the first entry is an end-of-list marker, the range
14731 describes an empty scope, i.e. no instructions. */
14737 *high_return = high;
14741 /* Get low and high pc attributes from a die. See enum pc_bounds_kind
14742 definition for the return value. *LOWPC and *HIGHPC are set iff
14743 neither PC_BOUNDS_NOT_PRESENT nor PC_BOUNDS_INVALID are returned. */
14745 static enum pc_bounds_kind
14746 dwarf2_get_pc_bounds (struct die_info *die, CORE_ADDR *lowpc,
14747 CORE_ADDR *highpc, struct dwarf2_cu *cu,
14748 struct partial_symtab *pst)
14750 struct dwarf2_per_objfile *dwarf2_per_objfile
14751 = cu->per_cu->dwarf2_per_objfile;
14752 struct attribute *attr;
14753 struct attribute *attr_high;
14755 CORE_ADDR high = 0;
14756 enum pc_bounds_kind ret;
14758 attr_high = dwarf2_attr (die, DW_AT_high_pc, cu);
14761 attr = dwarf2_attr (die, DW_AT_low_pc, cu);
14764 low = attr_value_as_address (attr);
14765 high = attr_value_as_address (attr_high);
14766 if (cu->header.version >= 4 && attr_form_is_constant (attr_high))
14770 /* Found high w/o low attribute. */
14771 return PC_BOUNDS_INVALID;
14773 /* Found consecutive range of addresses. */
14774 ret = PC_BOUNDS_HIGH_LOW;
14778 attr = dwarf2_attr (die, DW_AT_ranges, cu);
14781 /* DW_AT_ranges_base does not apply to DIEs from the DWO skeleton.
14782 We take advantage of the fact that DW_AT_ranges does not appear
14783 in DW_TAG_compile_unit of DWO files. */
14784 int need_ranges_base = die->tag != DW_TAG_compile_unit;
14785 unsigned int ranges_offset = (DW_UNSND (attr)
14786 + (need_ranges_base
14790 /* Value of the DW_AT_ranges attribute is the offset in the
14791 .debug_ranges section. */
14792 if (!dwarf2_ranges_read (ranges_offset, &low, &high, cu, pst))
14793 return PC_BOUNDS_INVALID;
14794 /* Found discontinuous range of addresses. */
14795 ret = PC_BOUNDS_RANGES;
14798 return PC_BOUNDS_NOT_PRESENT;
14801 /* read_partial_die has also the strict LOW < HIGH requirement. */
14803 return PC_BOUNDS_INVALID;
14805 /* When using the GNU linker, .gnu.linkonce. sections are used to
14806 eliminate duplicate copies of functions and vtables and such.
14807 The linker will arbitrarily choose one and discard the others.
14808 The AT_*_pc values for such functions refer to local labels in
14809 these sections. If the section from that file was discarded, the
14810 labels are not in the output, so the relocs get a value of 0.
14811 If this is a discarded function, mark the pc bounds as invalid,
14812 so that GDB will ignore it. */
14813 if (low == 0 && !dwarf2_per_objfile->has_section_at_zero)
14814 return PC_BOUNDS_INVALID;
14822 /* Assuming that DIE represents a subprogram DIE or a lexical block, get
14823 its low and high PC addresses. Do nothing if these addresses could not
14824 be determined. Otherwise, set LOWPC to the low address if it is smaller,
14825 and HIGHPC to the high address if greater than HIGHPC. */
14828 dwarf2_get_subprogram_pc_bounds (struct die_info *die,
14829 CORE_ADDR *lowpc, CORE_ADDR *highpc,
14830 struct dwarf2_cu *cu)
14832 CORE_ADDR low, high;
14833 struct die_info *child = die->child;
14835 if (dwarf2_get_pc_bounds (die, &low, &high, cu, NULL) >= PC_BOUNDS_RANGES)
14837 *lowpc = std::min (*lowpc, low);
14838 *highpc = std::max (*highpc, high);
14841 /* If the language does not allow nested subprograms (either inside
14842 subprograms or lexical blocks), we're done. */
14843 if (cu->language != language_ada)
14846 /* Check all the children of the given DIE. If it contains nested
14847 subprograms, then check their pc bounds. Likewise, we need to
14848 check lexical blocks as well, as they may also contain subprogram
14850 while (child && child->tag)
14852 if (child->tag == DW_TAG_subprogram
14853 || child->tag == DW_TAG_lexical_block)
14854 dwarf2_get_subprogram_pc_bounds (child, lowpc, highpc, cu);
14855 child = sibling_die (child);
14859 /* Get the low and high pc's represented by the scope DIE, and store
14860 them in *LOWPC and *HIGHPC. If the correct values can't be
14861 determined, set *LOWPC to -1 and *HIGHPC to 0. */
14864 get_scope_pc_bounds (struct die_info *die,
14865 CORE_ADDR *lowpc, CORE_ADDR *highpc,
14866 struct dwarf2_cu *cu)
14868 CORE_ADDR best_low = (CORE_ADDR) -1;
14869 CORE_ADDR best_high = (CORE_ADDR) 0;
14870 CORE_ADDR current_low, current_high;
14872 if (dwarf2_get_pc_bounds (die, ¤t_low, ¤t_high, cu, NULL)
14873 >= PC_BOUNDS_RANGES)
14875 best_low = current_low;
14876 best_high = current_high;
14880 struct die_info *child = die->child;
14882 while (child && child->tag)
14884 switch (child->tag) {
14885 case DW_TAG_subprogram:
14886 dwarf2_get_subprogram_pc_bounds (child, &best_low, &best_high, cu);
14888 case DW_TAG_namespace:
14889 case DW_TAG_module:
14890 /* FIXME: carlton/2004-01-16: Should we do this for
14891 DW_TAG_class_type/DW_TAG_structure_type, too? I think
14892 that current GCC's always emit the DIEs corresponding
14893 to definitions of methods of classes as children of a
14894 DW_TAG_compile_unit or DW_TAG_namespace (as opposed to
14895 the DIEs giving the declarations, which could be
14896 anywhere). But I don't see any reason why the
14897 standards says that they have to be there. */
14898 get_scope_pc_bounds (child, ¤t_low, ¤t_high, cu);
14900 if (current_low != ((CORE_ADDR) -1))
14902 best_low = std::min (best_low, current_low);
14903 best_high = std::max (best_high, current_high);
14911 child = sibling_die (child);
14916 *highpc = best_high;
14919 /* Record the address ranges for BLOCK, offset by BASEADDR, as given
14923 dwarf2_record_block_ranges (struct die_info *die, struct block *block,
14924 CORE_ADDR baseaddr, struct dwarf2_cu *cu)
14926 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
14927 struct gdbarch *gdbarch = get_objfile_arch (objfile);
14928 struct attribute *attr;
14929 struct attribute *attr_high;
14931 attr_high = dwarf2_attr (die, DW_AT_high_pc, cu);
14934 attr = dwarf2_attr (die, DW_AT_low_pc, cu);
14937 CORE_ADDR low = attr_value_as_address (attr);
14938 CORE_ADDR high = attr_value_as_address (attr_high);
14940 if (cu->header.version >= 4 && attr_form_is_constant (attr_high))
14943 low = gdbarch_adjust_dwarf2_addr (gdbarch, low + baseaddr);
14944 high = gdbarch_adjust_dwarf2_addr (gdbarch, high + baseaddr);
14945 record_block_range (block, low, high - 1);
14949 attr = dwarf2_attr (die, DW_AT_ranges, cu);
14952 /* DW_AT_ranges_base does not apply to DIEs from the DWO skeleton.
14953 We take advantage of the fact that DW_AT_ranges does not appear
14954 in DW_TAG_compile_unit of DWO files. */
14955 int need_ranges_base = die->tag != DW_TAG_compile_unit;
14957 /* The value of the DW_AT_ranges attribute is the offset of the
14958 address range list in the .debug_ranges section. */
14959 unsigned long offset = (DW_UNSND (attr)
14960 + (need_ranges_base ? cu->ranges_base : 0));
14961 const gdb_byte *buffer;
14963 /* For some target architectures, but not others, the
14964 read_address function sign-extends the addresses it returns.
14965 To recognize base address selection entries, we need a
14967 unsigned int addr_size = cu->header.addr_size;
14968 CORE_ADDR base_select_mask = ~(~(CORE_ADDR)1 << (addr_size * 8 - 1));
14970 /* The base address, to which the next pair is relative. Note
14971 that this 'base' is a DWARF concept: most entries in a range
14972 list are relative, to reduce the number of relocs against the
14973 debugging information. This is separate from this function's
14974 'baseaddr' argument, which GDB uses to relocate debugging
14975 information from a shared library based on the address at
14976 which the library was loaded. */
14977 CORE_ADDR base = cu->base_address;
14978 int base_known = cu->base_known;
14980 dwarf2_ranges_process (offset, cu,
14981 [&] (CORE_ADDR start, CORE_ADDR end)
14985 start = gdbarch_adjust_dwarf2_addr (gdbarch, start);
14986 end = gdbarch_adjust_dwarf2_addr (gdbarch, end);
14987 record_block_range (block, start, end - 1);
14992 /* Check whether the producer field indicates either of GCC < 4.6, or the
14993 Intel C/C++ compiler, and cache the result in CU. */
14996 check_producer (struct dwarf2_cu *cu)
15000 if (cu->producer == NULL)
15002 /* For unknown compilers expect their behavior is DWARF version
15005 GCC started to support .debug_types sections by -gdwarf-4 since
15006 gcc-4.5.x. As the .debug_types sections are missing DW_AT_producer
15007 for their space efficiency GDB cannot workaround gcc-4.5.x -gdwarf-4
15008 combination. gcc-4.5.x -gdwarf-4 binaries have DW_AT_accessibility
15009 interpreted incorrectly by GDB now - GCC PR debug/48229. */
15011 else if (producer_is_gcc (cu->producer, &major, &minor))
15013 cu->producer_is_gxx_lt_4_6 = major < 4 || (major == 4 && minor < 6);
15014 cu->producer_is_gcc_lt_4_3 = major < 4 || (major == 4 && minor < 3);
15016 else if (producer_is_icc (cu->producer, &major, &minor))
15017 cu->producer_is_icc_lt_14 = major < 14;
15020 /* For other non-GCC compilers, expect their behavior is DWARF version
15024 cu->checked_producer = 1;
15027 /* Check for GCC PR debug/45124 fix which is not present in any G++ version up
15028 to 4.5.any while it is present already in G++ 4.6.0 - the PR has been fixed
15029 during 4.6.0 experimental. */
15032 producer_is_gxx_lt_4_6 (struct dwarf2_cu *cu)
15034 if (!cu->checked_producer)
15035 check_producer (cu);
15037 return cu->producer_is_gxx_lt_4_6;
15040 /* Return the default accessibility type if it is not overriden by
15041 DW_AT_accessibility. */
15043 static enum dwarf_access_attribute
15044 dwarf2_default_access_attribute (struct die_info *die, struct dwarf2_cu *cu)
15046 if (cu->header.version < 3 || producer_is_gxx_lt_4_6 (cu))
15048 /* The default DWARF 2 accessibility for members is public, the default
15049 accessibility for inheritance is private. */
15051 if (die->tag != DW_TAG_inheritance)
15052 return DW_ACCESS_public;
15054 return DW_ACCESS_private;
15058 /* DWARF 3+ defines the default accessibility a different way. The same
15059 rules apply now for DW_TAG_inheritance as for the members and it only
15060 depends on the container kind. */
15062 if (die->parent->tag == DW_TAG_class_type)
15063 return DW_ACCESS_private;
15065 return DW_ACCESS_public;
15069 /* Look for DW_AT_data_member_location. Set *OFFSET to the byte
15070 offset. If the attribute was not found return 0, otherwise return
15071 1. If it was found but could not properly be handled, set *OFFSET
15075 handle_data_member_location (struct die_info *die, struct dwarf2_cu *cu,
15078 struct attribute *attr;
15080 attr = dwarf2_attr (die, DW_AT_data_member_location, cu);
15085 /* Note that we do not check for a section offset first here.
15086 This is because DW_AT_data_member_location is new in DWARF 4,
15087 so if we see it, we can assume that a constant form is really
15088 a constant and not a section offset. */
15089 if (attr_form_is_constant (attr))
15090 *offset = dwarf2_get_attr_constant_value (attr, 0);
15091 else if (attr_form_is_section_offset (attr))
15092 dwarf2_complex_location_expr_complaint ();
15093 else if (attr_form_is_block (attr))
15094 *offset = decode_locdesc (DW_BLOCK (attr), cu);
15096 dwarf2_complex_location_expr_complaint ();
15104 /* Add an aggregate field to the field list. */
15107 dwarf2_add_field (struct field_info *fip, struct die_info *die,
15108 struct dwarf2_cu *cu)
15110 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
15111 struct gdbarch *gdbarch = get_objfile_arch (objfile);
15112 struct nextfield *new_field;
15113 struct attribute *attr;
15115 const char *fieldname = "";
15117 /* Allocate a new field list entry and link it in. */
15118 new_field = XNEW (struct nextfield);
15119 make_cleanup (xfree, new_field);
15120 memset (new_field, 0, sizeof (struct nextfield));
15122 if (die->tag == DW_TAG_inheritance)
15124 new_field->next = fip->baseclasses;
15125 fip->baseclasses = new_field;
15129 new_field->next = fip->fields;
15130 fip->fields = new_field;
15134 attr = dwarf2_attr (die, DW_AT_accessibility, cu);
15136 new_field->accessibility = DW_UNSND (attr);
15138 new_field->accessibility = dwarf2_default_access_attribute (die, cu);
15139 if (new_field->accessibility != DW_ACCESS_public)
15140 fip->non_public_fields = 1;
15142 attr = dwarf2_attr (die, DW_AT_virtuality, cu);
15144 new_field->virtuality = DW_UNSND (attr);
15146 new_field->virtuality = DW_VIRTUALITY_none;
15148 fp = &new_field->field;
15150 if (die->tag == DW_TAG_member && ! die_is_declaration (die, cu))
15154 /* Data member other than a C++ static data member. */
15156 /* Get type of field. */
15157 fp->type = die_type (die, cu);
15159 SET_FIELD_BITPOS (*fp, 0);
15161 /* Get bit size of field (zero if none). */
15162 attr = dwarf2_attr (die, DW_AT_bit_size, cu);
15165 FIELD_BITSIZE (*fp) = DW_UNSND (attr);
15169 FIELD_BITSIZE (*fp) = 0;
15172 /* Get bit offset of field. */
15173 if (handle_data_member_location (die, cu, &offset))
15174 SET_FIELD_BITPOS (*fp, offset * bits_per_byte);
15175 attr = dwarf2_attr (die, DW_AT_bit_offset, cu);
15178 if (gdbarch_bits_big_endian (gdbarch))
15180 /* For big endian bits, the DW_AT_bit_offset gives the
15181 additional bit offset from the MSB of the containing
15182 anonymous object to the MSB of the field. We don't
15183 have to do anything special since we don't need to
15184 know the size of the anonymous object. */
15185 SET_FIELD_BITPOS (*fp, FIELD_BITPOS (*fp) + DW_UNSND (attr));
15189 /* For little endian bits, compute the bit offset to the
15190 MSB of the anonymous object, subtract off the number of
15191 bits from the MSB of the field to the MSB of the
15192 object, and then subtract off the number of bits of
15193 the field itself. The result is the bit offset of
15194 the LSB of the field. */
15195 int anonymous_size;
15196 int bit_offset = DW_UNSND (attr);
15198 attr = dwarf2_attr (die, DW_AT_byte_size, cu);
15201 /* The size of the anonymous object containing
15202 the bit field is explicit, so use the
15203 indicated size (in bytes). */
15204 anonymous_size = DW_UNSND (attr);
15208 /* The size of the anonymous object containing
15209 the bit field must be inferred from the type
15210 attribute of the data member containing the
15212 anonymous_size = TYPE_LENGTH (fp->type);
15214 SET_FIELD_BITPOS (*fp,
15215 (FIELD_BITPOS (*fp)
15216 + anonymous_size * bits_per_byte
15217 - bit_offset - FIELD_BITSIZE (*fp)));
15220 attr = dwarf2_attr (die, DW_AT_data_bit_offset, cu);
15222 SET_FIELD_BITPOS (*fp, (FIELD_BITPOS (*fp)
15223 + dwarf2_get_attr_constant_value (attr, 0)));
15225 /* Get name of field. */
15226 fieldname = dwarf2_name (die, cu);
15227 if (fieldname == NULL)
15230 /* The name is already allocated along with this objfile, so we don't
15231 need to duplicate it for the type. */
15232 fp->name = fieldname;
15234 /* Change accessibility for artificial fields (e.g. virtual table
15235 pointer or virtual base class pointer) to private. */
15236 if (dwarf2_attr (die, DW_AT_artificial, cu))
15238 FIELD_ARTIFICIAL (*fp) = 1;
15239 new_field->accessibility = DW_ACCESS_private;
15240 fip->non_public_fields = 1;
15243 else if (die->tag == DW_TAG_member || die->tag == DW_TAG_variable)
15245 /* C++ static member. */
15247 /* NOTE: carlton/2002-11-05: It should be a DW_TAG_member that
15248 is a declaration, but all versions of G++ as of this writing
15249 (so through at least 3.2.1) incorrectly generate
15250 DW_TAG_variable tags. */
15252 const char *physname;
15254 /* Get name of field. */
15255 fieldname = dwarf2_name (die, cu);
15256 if (fieldname == NULL)
15259 attr = dwarf2_attr (die, DW_AT_const_value, cu);
15261 /* Only create a symbol if this is an external value.
15262 new_symbol checks this and puts the value in the global symbol
15263 table, which we want. If it is not external, new_symbol
15264 will try to put the value in cu->list_in_scope which is wrong. */
15265 && dwarf2_flag_true_p (die, DW_AT_external, cu))
15267 /* A static const member, not much different than an enum as far as
15268 we're concerned, except that we can support more types. */
15269 new_symbol (die, NULL, cu);
15272 /* Get physical name. */
15273 physname = dwarf2_physname (fieldname, die, cu);
15275 /* The name is already allocated along with this objfile, so we don't
15276 need to duplicate it for the type. */
15277 SET_FIELD_PHYSNAME (*fp, physname ? physname : "");
15278 FIELD_TYPE (*fp) = die_type (die, cu);
15279 FIELD_NAME (*fp) = fieldname;
15281 else if (die->tag == DW_TAG_inheritance)
15285 /* C++ base class field. */
15286 if (handle_data_member_location (die, cu, &offset))
15287 SET_FIELD_BITPOS (*fp, offset * bits_per_byte);
15288 FIELD_BITSIZE (*fp) = 0;
15289 FIELD_TYPE (*fp) = die_type (die, cu);
15290 FIELD_NAME (*fp) = type_name_no_tag (fp->type);
15291 fip->nbaseclasses++;
15295 /* Can the type given by DIE define another type? */
15298 type_can_define_types (const struct die_info *die)
15302 case DW_TAG_typedef:
15303 case DW_TAG_class_type:
15304 case DW_TAG_structure_type:
15305 case DW_TAG_union_type:
15306 case DW_TAG_enumeration_type:
15314 /* Add a type definition defined in the scope of the FIP's class. */
15317 dwarf2_add_type_defn (struct field_info *fip, struct die_info *die,
15318 struct dwarf2_cu *cu)
15320 struct decl_field_list *new_field;
15321 struct decl_field *fp;
15323 /* Allocate a new field list entry and link it in. */
15324 new_field = XCNEW (struct decl_field_list);
15325 make_cleanup (xfree, new_field);
15327 gdb_assert (type_can_define_types (die));
15329 fp = &new_field->field;
15331 /* Get name of field. NULL is okay here, meaning an anonymous type. */
15332 fp->name = dwarf2_name (die, cu);
15333 fp->type = read_type_die (die, cu);
15335 /* Save accessibility. */
15336 enum dwarf_access_attribute accessibility;
15337 struct attribute *attr = dwarf2_attr (die, DW_AT_accessibility, cu);
15339 accessibility = (enum dwarf_access_attribute) DW_UNSND (attr);
15341 accessibility = dwarf2_default_access_attribute (die, cu);
15342 switch (accessibility)
15344 case DW_ACCESS_public:
15345 /* The assumed value if neither private nor protected. */
15347 case DW_ACCESS_private:
15348 fp->is_private = 1;
15350 case DW_ACCESS_protected:
15351 fp->is_protected = 1;
15354 complaint (&symfile_complaints,
15355 _("Unhandled DW_AT_accessibility value (%x)"), accessibility);
15358 if (die->tag == DW_TAG_typedef)
15360 new_field->next = fip->typedef_field_list;
15361 fip->typedef_field_list = new_field;
15362 fip->typedef_field_list_count++;
15366 new_field->next = fip->nested_types_list;
15367 fip->nested_types_list = new_field;
15368 fip->nested_types_list_count++;
15372 /* Create the vector of fields, and attach it to the type. */
15375 dwarf2_attach_fields_to_type (struct field_info *fip, struct type *type,
15376 struct dwarf2_cu *cu)
15378 int nfields = fip->nfields;
15380 /* Record the field count, allocate space for the array of fields,
15381 and create blank accessibility bitfields if necessary. */
15382 TYPE_NFIELDS (type) = nfields;
15383 TYPE_FIELDS (type) = (struct field *)
15384 TYPE_ALLOC (type, sizeof (struct field) * nfields);
15385 memset (TYPE_FIELDS (type), 0, sizeof (struct field) * nfields);
15387 if (fip->non_public_fields && cu->language != language_ada)
15389 ALLOCATE_CPLUS_STRUCT_TYPE (type);
15391 TYPE_FIELD_PRIVATE_BITS (type) =
15392 (B_TYPE *) TYPE_ALLOC (type, B_BYTES (nfields));
15393 B_CLRALL (TYPE_FIELD_PRIVATE_BITS (type), nfields);
15395 TYPE_FIELD_PROTECTED_BITS (type) =
15396 (B_TYPE *) TYPE_ALLOC (type, B_BYTES (nfields));
15397 B_CLRALL (TYPE_FIELD_PROTECTED_BITS (type), nfields);
15399 TYPE_FIELD_IGNORE_BITS (type) =
15400 (B_TYPE *) TYPE_ALLOC (type, B_BYTES (nfields));
15401 B_CLRALL (TYPE_FIELD_IGNORE_BITS (type), nfields);
15404 /* If the type has baseclasses, allocate and clear a bit vector for
15405 TYPE_FIELD_VIRTUAL_BITS. */
15406 if (fip->nbaseclasses && cu->language != language_ada)
15408 int num_bytes = B_BYTES (fip->nbaseclasses);
15409 unsigned char *pointer;
15411 ALLOCATE_CPLUS_STRUCT_TYPE (type);
15412 pointer = (unsigned char *) TYPE_ALLOC (type, num_bytes);
15413 TYPE_FIELD_VIRTUAL_BITS (type) = pointer;
15414 B_CLRALL (TYPE_FIELD_VIRTUAL_BITS (type), fip->nbaseclasses);
15415 TYPE_N_BASECLASSES (type) = fip->nbaseclasses;
15418 /* Copy the saved-up fields into the field vector. Start from the head of
15419 the list, adding to the tail of the field array, so that they end up in
15420 the same order in the array in which they were added to the list. */
15421 while (nfields-- > 0)
15423 struct nextfield *fieldp;
15427 fieldp = fip->fields;
15428 fip->fields = fieldp->next;
15432 fieldp = fip->baseclasses;
15433 fip->baseclasses = fieldp->next;
15436 TYPE_FIELD (type, nfields) = fieldp->field;
15437 switch (fieldp->accessibility)
15439 case DW_ACCESS_private:
15440 if (cu->language != language_ada)
15441 SET_TYPE_FIELD_PRIVATE (type, nfields);
15444 case DW_ACCESS_protected:
15445 if (cu->language != language_ada)
15446 SET_TYPE_FIELD_PROTECTED (type, nfields);
15449 case DW_ACCESS_public:
15453 /* Unknown accessibility. Complain and treat it as public. */
15455 complaint (&symfile_complaints, _("unsupported accessibility %d"),
15456 fieldp->accessibility);
15460 if (nfields < fip->nbaseclasses)
15462 switch (fieldp->virtuality)
15464 case DW_VIRTUALITY_virtual:
15465 case DW_VIRTUALITY_pure_virtual:
15466 if (cu->language == language_ada)
15467 error (_("unexpected virtuality in component of Ada type"));
15468 SET_TYPE_FIELD_VIRTUAL (type, nfields);
15475 /* Return true if this member function is a constructor, false
15479 dwarf2_is_constructor (struct die_info *die, struct dwarf2_cu *cu)
15481 const char *fieldname;
15482 const char *type_name;
15485 if (die->parent == NULL)
15488 if (die->parent->tag != DW_TAG_structure_type
15489 && die->parent->tag != DW_TAG_union_type
15490 && die->parent->tag != DW_TAG_class_type)
15493 fieldname = dwarf2_name (die, cu);
15494 type_name = dwarf2_name (die->parent, cu);
15495 if (fieldname == NULL || type_name == NULL)
15498 len = strlen (fieldname);
15499 return (strncmp (fieldname, type_name, len) == 0
15500 && (type_name[len] == '\0' || type_name[len] == '<'));
15503 /* Add a member function to the proper fieldlist. */
15506 dwarf2_add_member_fn (struct field_info *fip, struct die_info *die,
15507 struct type *type, struct dwarf2_cu *cu)
15509 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
15510 struct attribute *attr;
15511 struct fnfieldlist *flp;
15513 struct fn_field *fnp;
15514 const char *fieldname;
15515 struct nextfnfield *new_fnfield;
15516 struct type *this_type;
15517 enum dwarf_access_attribute accessibility;
15519 if (cu->language == language_ada)
15520 error (_("unexpected member function in Ada type"));
15522 /* Get name of member function. */
15523 fieldname = dwarf2_name (die, cu);
15524 if (fieldname == NULL)
15527 /* Look up member function name in fieldlist. */
15528 for (i = 0; i < fip->nfnfields; i++)
15530 if (strcmp (fip->fnfieldlists[i].name, fieldname) == 0)
15534 /* Create new list element if necessary. */
15535 if (i < fip->nfnfields)
15536 flp = &fip->fnfieldlists[i];
15539 if ((fip->nfnfields % DW_FIELD_ALLOC_CHUNK) == 0)
15541 fip->fnfieldlists = (struct fnfieldlist *)
15542 xrealloc (fip->fnfieldlists,
15543 (fip->nfnfields + DW_FIELD_ALLOC_CHUNK)
15544 * sizeof (struct fnfieldlist));
15545 if (fip->nfnfields == 0)
15546 make_cleanup (free_current_contents, &fip->fnfieldlists);
15548 flp = &fip->fnfieldlists[fip->nfnfields];
15549 flp->name = fieldname;
15552 i = fip->nfnfields++;
15555 /* Create a new member function field and chain it to the field list
15557 new_fnfield = XNEW (struct nextfnfield);
15558 make_cleanup (xfree, new_fnfield);
15559 memset (new_fnfield, 0, sizeof (struct nextfnfield));
15560 new_fnfield->next = flp->head;
15561 flp->head = new_fnfield;
15564 /* Fill in the member function field info. */
15565 fnp = &new_fnfield->fnfield;
15567 /* Delay processing of the physname until later. */
15568 if (cu->language == language_cplus)
15570 add_to_method_list (type, i, flp->length - 1, fieldname,
15575 const char *physname = dwarf2_physname (fieldname, die, cu);
15576 fnp->physname = physname ? physname : "";
15579 fnp->type = alloc_type (objfile);
15580 this_type = read_type_die (die, cu);
15581 if (this_type && TYPE_CODE (this_type) == TYPE_CODE_FUNC)
15583 int nparams = TYPE_NFIELDS (this_type);
15585 /* TYPE is the domain of this method, and THIS_TYPE is the type
15586 of the method itself (TYPE_CODE_METHOD). */
15587 smash_to_method_type (fnp->type, type,
15588 TYPE_TARGET_TYPE (this_type),
15589 TYPE_FIELDS (this_type),
15590 TYPE_NFIELDS (this_type),
15591 TYPE_VARARGS (this_type));
15593 /* Handle static member functions.
15594 Dwarf2 has no clean way to discern C++ static and non-static
15595 member functions. G++ helps GDB by marking the first
15596 parameter for non-static member functions (which is the this
15597 pointer) as artificial. We obtain this information from
15598 read_subroutine_type via TYPE_FIELD_ARTIFICIAL. */
15599 if (nparams == 0 || TYPE_FIELD_ARTIFICIAL (this_type, 0) == 0)
15600 fnp->voffset = VOFFSET_STATIC;
15603 complaint (&symfile_complaints, _("member function type missing for '%s'"),
15604 dwarf2_full_name (fieldname, die, cu));
15606 /* Get fcontext from DW_AT_containing_type if present. */
15607 if (dwarf2_attr (die, DW_AT_containing_type, cu) != NULL)
15608 fnp->fcontext = die_containing_type (die, cu);
15610 /* dwarf2 doesn't have stubbed physical names, so the setting of is_const and
15611 is_volatile is irrelevant, as it is needed by gdb_mangle_name only. */
15613 /* Get accessibility. */
15614 attr = dwarf2_attr (die, DW_AT_accessibility, cu);
15616 accessibility = (enum dwarf_access_attribute) DW_UNSND (attr);
15618 accessibility = dwarf2_default_access_attribute (die, cu);
15619 switch (accessibility)
15621 case DW_ACCESS_private:
15622 fnp->is_private = 1;
15624 case DW_ACCESS_protected:
15625 fnp->is_protected = 1;
15629 /* Check for artificial methods. */
15630 attr = dwarf2_attr (die, DW_AT_artificial, cu);
15631 if (attr && DW_UNSND (attr) != 0)
15632 fnp->is_artificial = 1;
15634 fnp->is_constructor = dwarf2_is_constructor (die, cu);
15636 /* Get index in virtual function table if it is a virtual member
15637 function. For older versions of GCC, this is an offset in the
15638 appropriate virtual table, as specified by DW_AT_containing_type.
15639 For everyone else, it is an expression to be evaluated relative
15640 to the object address. */
15642 attr = dwarf2_attr (die, DW_AT_vtable_elem_location, cu);
15645 if (attr_form_is_block (attr) && DW_BLOCK (attr)->size > 0)
15647 if (DW_BLOCK (attr)->data[0] == DW_OP_constu)
15649 /* Old-style GCC. */
15650 fnp->voffset = decode_locdesc (DW_BLOCK (attr), cu) + 2;
15652 else if (DW_BLOCK (attr)->data[0] == DW_OP_deref
15653 || (DW_BLOCK (attr)->size > 1
15654 && DW_BLOCK (attr)->data[0] == DW_OP_deref_size
15655 && DW_BLOCK (attr)->data[1] == cu->header.addr_size))
15657 fnp->voffset = decode_locdesc (DW_BLOCK (attr), cu);
15658 if ((fnp->voffset % cu->header.addr_size) != 0)
15659 dwarf2_complex_location_expr_complaint ();
15661 fnp->voffset /= cu->header.addr_size;
15665 dwarf2_complex_location_expr_complaint ();
15667 if (!fnp->fcontext)
15669 /* If there is no `this' field and no DW_AT_containing_type,
15670 we cannot actually find a base class context for the
15672 if (TYPE_NFIELDS (this_type) == 0
15673 || !TYPE_FIELD_ARTIFICIAL (this_type, 0))
15675 complaint (&symfile_complaints,
15676 _("cannot determine context for virtual member "
15677 "function \"%s\" (offset %s)"),
15678 fieldname, sect_offset_str (die->sect_off));
15683 = TYPE_TARGET_TYPE (TYPE_FIELD_TYPE (this_type, 0));
15687 else if (attr_form_is_section_offset (attr))
15689 dwarf2_complex_location_expr_complaint ();
15693 dwarf2_invalid_attrib_class_complaint ("DW_AT_vtable_elem_location",
15699 attr = dwarf2_attr (die, DW_AT_virtuality, cu);
15700 if (attr && DW_UNSND (attr))
15702 /* GCC does this, as of 2008-08-25; PR debug/37237. */
15703 complaint (&symfile_complaints,
15704 _("Member function \"%s\" (offset %s) is virtual "
15705 "but the vtable offset is not specified"),
15706 fieldname, sect_offset_str (die->sect_off));
15707 ALLOCATE_CPLUS_STRUCT_TYPE (type);
15708 TYPE_CPLUS_DYNAMIC (type) = 1;
15713 /* Create the vector of member function fields, and attach it to the type. */
15716 dwarf2_attach_fn_fields_to_type (struct field_info *fip, struct type *type,
15717 struct dwarf2_cu *cu)
15719 struct fnfieldlist *flp;
15722 if (cu->language == language_ada)
15723 error (_("unexpected member functions in Ada type"));
15725 ALLOCATE_CPLUS_STRUCT_TYPE (type);
15726 TYPE_FN_FIELDLISTS (type) = (struct fn_fieldlist *)
15727 TYPE_ALLOC (type, sizeof (struct fn_fieldlist) * fip->nfnfields);
15729 for (i = 0, flp = fip->fnfieldlists; i < fip->nfnfields; i++, flp++)
15731 struct nextfnfield *nfp = flp->head;
15732 struct fn_fieldlist *fn_flp = &TYPE_FN_FIELDLIST (type, i);
15735 TYPE_FN_FIELDLIST_NAME (type, i) = flp->name;
15736 TYPE_FN_FIELDLIST_LENGTH (type, i) = flp->length;
15737 fn_flp->fn_fields = (struct fn_field *)
15738 TYPE_ALLOC (type, sizeof (struct fn_field) * flp->length);
15739 for (k = flp->length; (k--, nfp); nfp = nfp->next)
15740 fn_flp->fn_fields[k] = nfp->fnfield;
15743 TYPE_NFN_FIELDS (type) = fip->nfnfields;
15746 /* Returns non-zero if NAME is the name of a vtable member in CU's
15747 language, zero otherwise. */
15749 is_vtable_name (const char *name, struct dwarf2_cu *cu)
15751 static const char vptr[] = "_vptr";
15753 /* Look for the C++ form of the vtable. */
15754 if (startswith (name, vptr) && is_cplus_marker (name[sizeof (vptr) - 1]))
15760 /* GCC outputs unnamed structures that are really pointers to member
15761 functions, with the ABI-specified layout. If TYPE describes
15762 such a structure, smash it into a member function type.
15764 GCC shouldn't do this; it should just output pointer to member DIEs.
15765 This is GCC PR debug/28767. */
15768 quirk_gcc_member_function_pointer (struct type *type, struct objfile *objfile)
15770 struct type *pfn_type, *self_type, *new_type;
15772 /* Check for a structure with no name and two children. */
15773 if (TYPE_CODE (type) != TYPE_CODE_STRUCT || TYPE_NFIELDS (type) != 2)
15776 /* Check for __pfn and __delta members. */
15777 if (TYPE_FIELD_NAME (type, 0) == NULL
15778 || strcmp (TYPE_FIELD_NAME (type, 0), "__pfn") != 0
15779 || TYPE_FIELD_NAME (type, 1) == NULL
15780 || strcmp (TYPE_FIELD_NAME (type, 1), "__delta") != 0)
15783 /* Find the type of the method. */
15784 pfn_type = TYPE_FIELD_TYPE (type, 0);
15785 if (pfn_type == NULL
15786 || TYPE_CODE (pfn_type) != TYPE_CODE_PTR
15787 || TYPE_CODE (TYPE_TARGET_TYPE (pfn_type)) != TYPE_CODE_FUNC)
15790 /* Look for the "this" argument. */
15791 pfn_type = TYPE_TARGET_TYPE (pfn_type);
15792 if (TYPE_NFIELDS (pfn_type) == 0
15793 /* || TYPE_FIELD_TYPE (pfn_type, 0) == NULL */
15794 || TYPE_CODE (TYPE_FIELD_TYPE (pfn_type, 0)) != TYPE_CODE_PTR)
15797 self_type = TYPE_TARGET_TYPE (TYPE_FIELD_TYPE (pfn_type, 0));
15798 new_type = alloc_type (objfile);
15799 smash_to_method_type (new_type, self_type, TYPE_TARGET_TYPE (pfn_type),
15800 TYPE_FIELDS (pfn_type), TYPE_NFIELDS (pfn_type),
15801 TYPE_VARARGS (pfn_type));
15802 smash_to_methodptr_type (type, new_type);
15806 /* Called when we find the DIE that starts a structure or union scope
15807 (definition) to create a type for the structure or union. Fill in
15808 the type's name and general properties; the members will not be
15809 processed until process_structure_scope. A symbol table entry for
15810 the type will also not be done until process_structure_scope (assuming
15811 the type has a name).
15813 NOTE: we need to call these functions regardless of whether or not the
15814 DIE has a DW_AT_name attribute, since it might be an anonymous
15815 structure or union. This gets the type entered into our set of
15816 user defined types. */
15818 static struct type *
15819 read_structure_type (struct die_info *die, struct dwarf2_cu *cu)
15821 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
15823 struct attribute *attr;
15826 /* If the definition of this type lives in .debug_types, read that type.
15827 Don't follow DW_AT_specification though, that will take us back up
15828 the chain and we want to go down. */
15829 attr = dwarf2_attr_no_follow (die, DW_AT_signature);
15832 type = get_DW_AT_signature_type (die, attr, cu);
15834 /* The type's CU may not be the same as CU.
15835 Ensure TYPE is recorded with CU in die_type_hash. */
15836 return set_die_type (die, type, cu);
15839 type = alloc_type (objfile);
15840 INIT_CPLUS_SPECIFIC (type);
15842 name = dwarf2_name (die, cu);
15845 if (cu->language == language_cplus
15846 || cu->language == language_d
15847 || cu->language == language_rust)
15849 const char *full_name = dwarf2_full_name (name, die, cu);
15851 /* dwarf2_full_name might have already finished building the DIE's
15852 type. If so, there is no need to continue. */
15853 if (get_die_type (die, cu) != NULL)
15854 return get_die_type (die, cu);
15856 TYPE_TAG_NAME (type) = full_name;
15857 if (die->tag == DW_TAG_structure_type
15858 || die->tag == DW_TAG_class_type)
15859 TYPE_NAME (type) = TYPE_TAG_NAME (type);
15863 /* The name is already allocated along with this objfile, so
15864 we don't need to duplicate it for the type. */
15865 TYPE_TAG_NAME (type) = name;
15866 if (die->tag == DW_TAG_class_type)
15867 TYPE_NAME (type) = TYPE_TAG_NAME (type);
15871 if (die->tag == DW_TAG_structure_type)
15873 TYPE_CODE (type) = TYPE_CODE_STRUCT;
15875 else if (die->tag == DW_TAG_union_type)
15877 TYPE_CODE (type) = TYPE_CODE_UNION;
15881 TYPE_CODE (type) = TYPE_CODE_STRUCT;
15884 if (cu->language == language_cplus && die->tag == DW_TAG_class_type)
15885 TYPE_DECLARED_CLASS (type) = 1;
15887 attr = dwarf2_attr (die, DW_AT_byte_size, cu);
15890 if (attr_form_is_constant (attr))
15891 TYPE_LENGTH (type) = DW_UNSND (attr);
15894 /* For the moment, dynamic type sizes are not supported
15895 by GDB's struct type. The actual size is determined
15896 on-demand when resolving the type of a given object,
15897 so set the type's length to zero for now. Otherwise,
15898 we record an expression as the length, and that expression
15899 could lead to a very large value, which could eventually
15900 lead to us trying to allocate that much memory when creating
15901 a value of that type. */
15902 TYPE_LENGTH (type) = 0;
15907 TYPE_LENGTH (type) = 0;
15910 if (producer_is_icc_lt_14 (cu) && (TYPE_LENGTH (type) == 0))
15912 /* ICC<14 does not output the required DW_AT_declaration on
15913 incomplete types, but gives them a size of zero. */
15914 TYPE_STUB (type) = 1;
15917 TYPE_STUB_SUPPORTED (type) = 1;
15919 if (die_is_declaration (die, cu))
15920 TYPE_STUB (type) = 1;
15921 else if (attr == NULL && die->child == NULL
15922 && producer_is_realview (cu->producer))
15923 /* RealView does not output the required DW_AT_declaration
15924 on incomplete types. */
15925 TYPE_STUB (type) = 1;
15927 /* We need to add the type field to the die immediately so we don't
15928 infinitely recurse when dealing with pointers to the structure
15929 type within the structure itself. */
15930 set_die_type (die, type, cu);
15932 /* set_die_type should be already done. */
15933 set_descriptive_type (type, die, cu);
15938 /* Finish creating a structure or union type, including filling in
15939 its members and creating a symbol for it. */
15942 process_structure_scope (struct die_info *die, struct dwarf2_cu *cu)
15944 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
15945 struct die_info *child_die;
15948 type = get_die_type (die, cu);
15950 type = read_structure_type (die, cu);
15952 if (die->child != NULL && ! die_is_declaration (die, cu))
15954 struct field_info fi;
15955 std::vector<struct symbol *> template_args;
15956 struct cleanup *back_to = make_cleanup (null_cleanup, 0);
15958 memset (&fi, 0, sizeof (struct field_info));
15960 child_die = die->child;
15962 while (child_die && child_die->tag)
15964 if (child_die->tag == DW_TAG_member
15965 || child_die->tag == DW_TAG_variable)
15967 /* NOTE: carlton/2002-11-05: A C++ static data member
15968 should be a DW_TAG_member that is a declaration, but
15969 all versions of G++ as of this writing (so through at
15970 least 3.2.1) incorrectly generate DW_TAG_variable
15971 tags for them instead. */
15972 dwarf2_add_field (&fi, child_die, cu);
15974 else if (child_die->tag == DW_TAG_subprogram)
15976 /* Rust doesn't have member functions in the C++ sense.
15977 However, it does emit ordinary functions as children
15978 of a struct DIE. */
15979 if (cu->language == language_rust)
15980 read_func_scope (child_die, cu);
15983 /* C++ member function. */
15984 dwarf2_add_member_fn (&fi, child_die, type, cu);
15987 else if (child_die->tag == DW_TAG_inheritance)
15989 /* C++ base class field. */
15990 dwarf2_add_field (&fi, child_die, cu);
15992 else if (type_can_define_types (child_die))
15993 dwarf2_add_type_defn (&fi, child_die, cu);
15994 else if (child_die->tag == DW_TAG_template_type_param
15995 || child_die->tag == DW_TAG_template_value_param)
15997 struct symbol *arg = new_symbol (child_die, NULL, cu);
16000 template_args.push_back (arg);
16003 child_die = sibling_die (child_die);
16006 /* Attach template arguments to type. */
16007 if (!template_args.empty ())
16009 ALLOCATE_CPLUS_STRUCT_TYPE (type);
16010 TYPE_N_TEMPLATE_ARGUMENTS (type) = template_args.size ();
16011 TYPE_TEMPLATE_ARGUMENTS (type)
16012 = XOBNEWVEC (&objfile->objfile_obstack,
16014 TYPE_N_TEMPLATE_ARGUMENTS (type));
16015 memcpy (TYPE_TEMPLATE_ARGUMENTS (type),
16016 template_args.data (),
16017 (TYPE_N_TEMPLATE_ARGUMENTS (type)
16018 * sizeof (struct symbol *)));
16021 /* Attach fields and member functions to the type. */
16023 dwarf2_attach_fields_to_type (&fi, type, cu);
16026 dwarf2_attach_fn_fields_to_type (&fi, type, cu);
16028 /* Get the type which refers to the base class (possibly this
16029 class itself) which contains the vtable pointer for the current
16030 class from the DW_AT_containing_type attribute. This use of
16031 DW_AT_containing_type is a GNU extension. */
16033 if (dwarf2_attr (die, DW_AT_containing_type, cu) != NULL)
16035 struct type *t = die_containing_type (die, cu);
16037 set_type_vptr_basetype (type, t);
16042 /* Our own class provides vtbl ptr. */
16043 for (i = TYPE_NFIELDS (t) - 1;
16044 i >= TYPE_N_BASECLASSES (t);
16047 const char *fieldname = TYPE_FIELD_NAME (t, i);
16049 if (is_vtable_name (fieldname, cu))
16051 set_type_vptr_fieldno (type, i);
16056 /* Complain if virtual function table field not found. */
16057 if (i < TYPE_N_BASECLASSES (t))
16058 complaint (&symfile_complaints,
16059 _("virtual function table pointer "
16060 "not found when defining class '%s'"),
16061 TYPE_TAG_NAME (type) ? TYPE_TAG_NAME (type) :
16066 set_type_vptr_fieldno (type, TYPE_VPTR_FIELDNO (t));
16069 else if (cu->producer
16070 && startswith (cu->producer, "IBM(R) XL C/C++ Advanced Edition"))
16072 /* The IBM XLC compiler does not provide direct indication
16073 of the containing type, but the vtable pointer is
16074 always named __vfp. */
16078 for (i = TYPE_NFIELDS (type) - 1;
16079 i >= TYPE_N_BASECLASSES (type);
16082 if (strcmp (TYPE_FIELD_NAME (type, i), "__vfp") == 0)
16084 set_type_vptr_fieldno (type, i);
16085 set_type_vptr_basetype (type, type);
16092 /* Copy fi.typedef_field_list linked list elements content into the
16093 allocated array TYPE_TYPEDEF_FIELD_ARRAY (type). */
16094 if (fi.typedef_field_list)
16096 int i = fi.typedef_field_list_count;
16098 ALLOCATE_CPLUS_STRUCT_TYPE (type);
16099 TYPE_TYPEDEF_FIELD_ARRAY (type)
16100 = ((struct decl_field *)
16101 TYPE_ALLOC (type, sizeof (TYPE_TYPEDEF_FIELD (type, 0)) * i));
16102 TYPE_TYPEDEF_FIELD_COUNT (type) = i;
16104 /* Reverse the list order to keep the debug info elements order. */
16107 struct decl_field *dest, *src;
16109 dest = &TYPE_TYPEDEF_FIELD (type, i);
16110 src = &fi.typedef_field_list->field;
16111 fi.typedef_field_list = fi.typedef_field_list->next;
16116 /* Copy fi.nested_types_list linked list elements content into the
16117 allocated array TYPE_NESTED_TYPES_ARRAY (type). */
16118 if (fi.nested_types_list != NULL && cu->language != language_ada)
16120 int i = fi.nested_types_list_count;
16122 ALLOCATE_CPLUS_STRUCT_TYPE (type);
16123 TYPE_NESTED_TYPES_ARRAY (type)
16124 = ((struct decl_field *)
16125 TYPE_ALLOC (type, sizeof (struct decl_field) * i));
16126 TYPE_NESTED_TYPES_COUNT (type) = i;
16128 /* Reverse the list order to keep the debug info elements order. */
16131 struct decl_field *dest, *src;
16133 dest = &TYPE_NESTED_TYPES_FIELD (type, i);
16134 src = &fi.nested_types_list->field;
16135 fi.nested_types_list = fi.nested_types_list->next;
16140 do_cleanups (back_to);
16143 quirk_gcc_member_function_pointer (type, objfile);
16145 /* NOTE: carlton/2004-03-16: GCC 3.4 (or at least one of its
16146 snapshots) has been known to create a die giving a declaration
16147 for a class that has, as a child, a die giving a definition for a
16148 nested class. So we have to process our children even if the
16149 current die is a declaration. Normally, of course, a declaration
16150 won't have any children at all. */
16152 child_die = die->child;
16154 while (child_die != NULL && child_die->tag)
16156 if (child_die->tag == DW_TAG_member
16157 || child_die->tag == DW_TAG_variable
16158 || child_die->tag == DW_TAG_inheritance
16159 || child_die->tag == DW_TAG_template_value_param
16160 || child_die->tag == DW_TAG_template_type_param)
16165 process_die (child_die, cu);
16167 child_die = sibling_die (child_die);
16170 /* Do not consider external references. According to the DWARF standard,
16171 these DIEs are identified by the fact that they have no byte_size
16172 attribute, and a declaration attribute. */
16173 if (dwarf2_attr (die, DW_AT_byte_size, cu) != NULL
16174 || !die_is_declaration (die, cu))
16175 new_symbol (die, type, cu);
16178 /* Assuming DIE is an enumeration type, and TYPE is its associated type,
16179 update TYPE using some information only available in DIE's children. */
16182 update_enumeration_type_from_children (struct die_info *die,
16184 struct dwarf2_cu *cu)
16186 struct die_info *child_die;
16187 int unsigned_enum = 1;
16191 auto_obstack obstack;
16193 for (child_die = die->child;
16194 child_die != NULL && child_die->tag;
16195 child_die = sibling_die (child_die))
16197 struct attribute *attr;
16199 const gdb_byte *bytes;
16200 struct dwarf2_locexpr_baton *baton;
16203 if (child_die->tag != DW_TAG_enumerator)
16206 attr = dwarf2_attr (child_die, DW_AT_const_value, cu);
16210 name = dwarf2_name (child_die, cu);
16212 name = "<anonymous enumerator>";
16214 dwarf2_const_value_attr (attr, type, name, &obstack, cu,
16215 &value, &bytes, &baton);
16221 else if ((mask & value) != 0)
16226 /* If we already know that the enum type is neither unsigned, nor
16227 a flag type, no need to look at the rest of the enumerates. */
16228 if (!unsigned_enum && !flag_enum)
16233 TYPE_UNSIGNED (type) = 1;
16235 TYPE_FLAG_ENUM (type) = 1;
16238 /* Given a DW_AT_enumeration_type die, set its type. We do not
16239 complete the type's fields yet, or create any symbols. */
16241 static struct type *
16242 read_enumeration_type (struct die_info *die, struct dwarf2_cu *cu)
16244 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
16246 struct attribute *attr;
16249 /* If the definition of this type lives in .debug_types, read that type.
16250 Don't follow DW_AT_specification though, that will take us back up
16251 the chain and we want to go down. */
16252 attr = dwarf2_attr_no_follow (die, DW_AT_signature);
16255 type = get_DW_AT_signature_type (die, attr, cu);
16257 /* The type's CU may not be the same as CU.
16258 Ensure TYPE is recorded with CU in die_type_hash. */
16259 return set_die_type (die, type, cu);
16262 type = alloc_type (objfile);
16264 TYPE_CODE (type) = TYPE_CODE_ENUM;
16265 name = dwarf2_full_name (NULL, die, cu);
16267 TYPE_TAG_NAME (type) = name;
16269 attr = dwarf2_attr (die, DW_AT_type, cu);
16272 struct type *underlying_type = die_type (die, cu);
16274 TYPE_TARGET_TYPE (type) = underlying_type;
16277 attr = dwarf2_attr (die, DW_AT_byte_size, cu);
16280 TYPE_LENGTH (type) = DW_UNSND (attr);
16284 TYPE_LENGTH (type) = 0;
16287 /* The enumeration DIE can be incomplete. In Ada, any type can be
16288 declared as private in the package spec, and then defined only
16289 inside the package body. Such types are known as Taft Amendment
16290 Types. When another package uses such a type, an incomplete DIE
16291 may be generated by the compiler. */
16292 if (die_is_declaration (die, cu))
16293 TYPE_STUB (type) = 1;
16295 /* Finish the creation of this type by using the enum's children.
16296 We must call this even when the underlying type has been provided
16297 so that we can determine if we're looking at a "flag" enum. */
16298 update_enumeration_type_from_children (die, type, cu);
16300 /* If this type has an underlying type that is not a stub, then we
16301 may use its attributes. We always use the "unsigned" attribute
16302 in this situation, because ordinarily we guess whether the type
16303 is unsigned -- but the guess can be wrong and the underlying type
16304 can tell us the reality. However, we defer to a local size
16305 attribute if one exists, because this lets the compiler override
16306 the underlying type if needed. */
16307 if (TYPE_TARGET_TYPE (type) != NULL && !TYPE_STUB (TYPE_TARGET_TYPE (type)))
16309 TYPE_UNSIGNED (type) = TYPE_UNSIGNED (TYPE_TARGET_TYPE (type));
16310 if (TYPE_LENGTH (type) == 0)
16311 TYPE_LENGTH (type) = TYPE_LENGTH (TYPE_TARGET_TYPE (type));
16314 TYPE_DECLARED_CLASS (type) = dwarf2_flag_true_p (die, DW_AT_enum_class, cu);
16316 return set_die_type (die, type, cu);
16319 /* Given a pointer to a die which begins an enumeration, process all
16320 the dies that define the members of the enumeration, and create the
16321 symbol for the enumeration type.
16323 NOTE: We reverse the order of the element list. */
16326 process_enumeration_scope (struct die_info *die, struct dwarf2_cu *cu)
16328 struct type *this_type;
16330 this_type = get_die_type (die, cu);
16331 if (this_type == NULL)
16332 this_type = read_enumeration_type (die, cu);
16334 if (die->child != NULL)
16336 struct die_info *child_die;
16337 struct symbol *sym;
16338 struct field *fields = NULL;
16339 int num_fields = 0;
16342 child_die = die->child;
16343 while (child_die && child_die->tag)
16345 if (child_die->tag != DW_TAG_enumerator)
16347 process_die (child_die, cu);
16351 name = dwarf2_name (child_die, cu);
16354 sym = new_symbol (child_die, this_type, cu);
16356 if ((num_fields % DW_FIELD_ALLOC_CHUNK) == 0)
16358 fields = (struct field *)
16360 (num_fields + DW_FIELD_ALLOC_CHUNK)
16361 * sizeof (struct field));
16364 FIELD_NAME (fields[num_fields]) = SYMBOL_LINKAGE_NAME (sym);
16365 FIELD_TYPE (fields[num_fields]) = NULL;
16366 SET_FIELD_ENUMVAL (fields[num_fields], SYMBOL_VALUE (sym));
16367 FIELD_BITSIZE (fields[num_fields]) = 0;
16373 child_die = sibling_die (child_die);
16378 TYPE_NFIELDS (this_type) = num_fields;
16379 TYPE_FIELDS (this_type) = (struct field *)
16380 TYPE_ALLOC (this_type, sizeof (struct field) * num_fields);
16381 memcpy (TYPE_FIELDS (this_type), fields,
16382 sizeof (struct field) * num_fields);
16387 /* If we are reading an enum from a .debug_types unit, and the enum
16388 is a declaration, and the enum is not the signatured type in the
16389 unit, then we do not want to add a symbol for it. Adding a
16390 symbol would in some cases obscure the true definition of the
16391 enum, giving users an incomplete type when the definition is
16392 actually available. Note that we do not want to do this for all
16393 enums which are just declarations, because C++0x allows forward
16394 enum declarations. */
16395 if (cu->per_cu->is_debug_types
16396 && die_is_declaration (die, cu))
16398 struct signatured_type *sig_type;
16400 sig_type = (struct signatured_type *) cu->per_cu;
16401 gdb_assert (to_underlying (sig_type->type_offset_in_section) != 0);
16402 if (sig_type->type_offset_in_section != die->sect_off)
16406 new_symbol (die, this_type, cu);
16409 /* Extract all information from a DW_TAG_array_type DIE and put it in
16410 the DIE's type field. For now, this only handles one dimensional
16413 static struct type *
16414 read_array_type (struct die_info *die, struct dwarf2_cu *cu)
16416 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
16417 struct die_info *child_die;
16419 struct type *element_type, *range_type, *index_type;
16420 struct attribute *attr;
16422 struct dynamic_prop *byte_stride_prop = NULL;
16423 unsigned int bit_stride = 0;
16425 element_type = die_type (die, cu);
16427 /* The die_type call above may have already set the type for this DIE. */
16428 type = get_die_type (die, cu);
16432 attr = dwarf2_attr (die, DW_AT_byte_stride, cu);
16438 = (struct dynamic_prop *) alloca (sizeof (struct dynamic_prop));
16439 stride_ok = attr_to_dynamic_prop (attr, die, cu, byte_stride_prop);
16442 complaint (&symfile_complaints,
16443 _("unable to read array DW_AT_byte_stride "
16444 " - DIE at %s [in module %s]"),
16445 sect_offset_str (die->sect_off),
16446 objfile_name (cu->per_cu->dwarf2_per_objfile->objfile));
16447 /* Ignore this attribute. We will likely not be able to print
16448 arrays of this type correctly, but there is little we can do
16449 to help if we cannot read the attribute's value. */
16450 byte_stride_prop = NULL;
16454 attr = dwarf2_attr (die, DW_AT_bit_stride, cu);
16456 bit_stride = DW_UNSND (attr);
16458 /* Irix 6.2 native cc creates array types without children for
16459 arrays with unspecified length. */
16460 if (die->child == NULL)
16462 index_type = objfile_type (objfile)->builtin_int;
16463 range_type = create_static_range_type (NULL, index_type, 0, -1);
16464 type = create_array_type_with_stride (NULL, element_type, range_type,
16465 byte_stride_prop, bit_stride);
16466 return set_die_type (die, type, cu);
16469 std::vector<struct type *> range_types;
16470 child_die = die->child;
16471 while (child_die && child_die->tag)
16473 if (child_die->tag == DW_TAG_subrange_type)
16475 struct type *child_type = read_type_die (child_die, cu);
16477 if (child_type != NULL)
16479 /* The range type was succesfully read. Save it for the
16480 array type creation. */
16481 range_types.push_back (child_type);
16484 child_die = sibling_die (child_die);
16487 /* Dwarf2 dimensions are output from left to right, create the
16488 necessary array types in backwards order. */
16490 type = element_type;
16492 if (read_array_order (die, cu) == DW_ORD_col_major)
16496 while (i < range_types.size ())
16497 type = create_array_type_with_stride (NULL, type, range_types[i++],
16498 byte_stride_prop, bit_stride);
16502 size_t ndim = range_types.size ();
16504 type = create_array_type_with_stride (NULL, type, range_types[ndim],
16505 byte_stride_prop, bit_stride);
16508 /* Understand Dwarf2 support for vector types (like they occur on
16509 the PowerPC w/ AltiVec). Gcc just adds another attribute to the
16510 array type. This is not part of the Dwarf2/3 standard yet, but a
16511 custom vendor extension. The main difference between a regular
16512 array and the vector variant is that vectors are passed by value
16514 attr = dwarf2_attr (die, DW_AT_GNU_vector, cu);
16516 make_vector_type (type);
16518 /* The DIE may have DW_AT_byte_size set. For example an OpenCL
16519 implementation may choose to implement triple vectors using this
16521 attr = dwarf2_attr (die, DW_AT_byte_size, cu);
16524 if (DW_UNSND (attr) >= TYPE_LENGTH (type))
16525 TYPE_LENGTH (type) = DW_UNSND (attr);
16527 complaint (&symfile_complaints,
16528 _("DW_AT_byte_size for array type smaller "
16529 "than the total size of elements"));
16532 name = dwarf2_name (die, cu);
16534 TYPE_NAME (type) = name;
16536 /* Install the type in the die. */
16537 set_die_type (die, type, cu);
16539 /* set_die_type should be already done. */
16540 set_descriptive_type (type, die, cu);
16545 static enum dwarf_array_dim_ordering
16546 read_array_order (struct die_info *die, struct dwarf2_cu *cu)
16548 struct attribute *attr;
16550 attr = dwarf2_attr (die, DW_AT_ordering, cu);
16553 return (enum dwarf_array_dim_ordering) DW_SND (attr);
16555 /* GNU F77 is a special case, as at 08/2004 array type info is the
16556 opposite order to the dwarf2 specification, but data is still
16557 laid out as per normal fortran.
16559 FIXME: dsl/2004-8-20: If G77 is ever fixed, this will also need
16560 version checking. */
16562 if (cu->language == language_fortran
16563 && cu->producer && strstr (cu->producer, "GNU F77"))
16565 return DW_ORD_row_major;
16568 switch (cu->language_defn->la_array_ordering)
16570 case array_column_major:
16571 return DW_ORD_col_major;
16572 case array_row_major:
16574 return DW_ORD_row_major;
16578 /* Extract all information from a DW_TAG_set_type DIE and put it in
16579 the DIE's type field. */
16581 static struct type *
16582 read_set_type (struct die_info *die, struct dwarf2_cu *cu)
16584 struct type *domain_type, *set_type;
16585 struct attribute *attr;
16587 domain_type = die_type (die, cu);
16589 /* The die_type call above may have already set the type for this DIE. */
16590 set_type = get_die_type (die, cu);
16594 set_type = create_set_type (NULL, domain_type);
16596 attr = dwarf2_attr (die, DW_AT_byte_size, cu);
16598 TYPE_LENGTH (set_type) = DW_UNSND (attr);
16600 return set_die_type (die, set_type, cu);
16603 /* A helper for read_common_block that creates a locexpr baton.
16604 SYM is the symbol which we are marking as computed.
16605 COMMON_DIE is the DIE for the common block.
16606 COMMON_LOC is the location expression attribute for the common
16608 MEMBER_LOC is the location expression attribute for the particular
16609 member of the common block that we are processing.
16610 CU is the CU from which the above come. */
16613 mark_common_block_symbol_computed (struct symbol *sym,
16614 struct die_info *common_die,
16615 struct attribute *common_loc,
16616 struct attribute *member_loc,
16617 struct dwarf2_cu *cu)
16619 struct dwarf2_per_objfile *dwarf2_per_objfile
16620 = cu->per_cu->dwarf2_per_objfile;
16621 struct objfile *objfile = dwarf2_per_objfile->objfile;
16622 struct dwarf2_locexpr_baton *baton;
16624 unsigned int cu_off;
16625 enum bfd_endian byte_order = gdbarch_byte_order (get_objfile_arch (objfile));
16626 LONGEST offset = 0;
16628 gdb_assert (common_loc && member_loc);
16629 gdb_assert (attr_form_is_block (common_loc));
16630 gdb_assert (attr_form_is_block (member_loc)
16631 || attr_form_is_constant (member_loc));
16633 baton = XOBNEW (&objfile->objfile_obstack, struct dwarf2_locexpr_baton);
16634 baton->per_cu = cu->per_cu;
16635 gdb_assert (baton->per_cu);
16637 baton->size = 5 /* DW_OP_call4 */ + 1 /* DW_OP_plus */;
16639 if (attr_form_is_constant (member_loc))
16641 offset = dwarf2_get_attr_constant_value (member_loc, 0);
16642 baton->size += 1 /* DW_OP_addr */ + cu->header.addr_size;
16645 baton->size += DW_BLOCK (member_loc)->size;
16647 ptr = (gdb_byte *) obstack_alloc (&objfile->objfile_obstack, baton->size);
16650 *ptr++ = DW_OP_call4;
16651 cu_off = common_die->sect_off - cu->per_cu->sect_off;
16652 store_unsigned_integer (ptr, 4, byte_order, cu_off);
16655 if (attr_form_is_constant (member_loc))
16657 *ptr++ = DW_OP_addr;
16658 store_unsigned_integer (ptr, cu->header.addr_size, byte_order, offset);
16659 ptr += cu->header.addr_size;
16663 /* We have to copy the data here, because DW_OP_call4 will only
16664 use a DW_AT_location attribute. */
16665 memcpy (ptr, DW_BLOCK (member_loc)->data, DW_BLOCK (member_loc)->size);
16666 ptr += DW_BLOCK (member_loc)->size;
16669 *ptr++ = DW_OP_plus;
16670 gdb_assert (ptr - baton->data == baton->size);
16672 SYMBOL_LOCATION_BATON (sym) = baton;
16673 SYMBOL_ACLASS_INDEX (sym) = dwarf2_locexpr_index;
16676 /* Create appropriate locally-scoped variables for all the
16677 DW_TAG_common_block entries. Also create a struct common_block
16678 listing all such variables for `info common'. COMMON_BLOCK_DOMAIN
16679 is used to sepate the common blocks name namespace from regular
16683 read_common_block (struct die_info *die, struct dwarf2_cu *cu)
16685 struct attribute *attr;
16687 attr = dwarf2_attr (die, DW_AT_location, cu);
16690 /* Support the .debug_loc offsets. */
16691 if (attr_form_is_block (attr))
16695 else if (attr_form_is_section_offset (attr))
16697 dwarf2_complex_location_expr_complaint ();
16702 dwarf2_invalid_attrib_class_complaint ("DW_AT_location",
16703 "common block member");
16708 if (die->child != NULL)
16710 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
16711 struct die_info *child_die;
16712 size_t n_entries = 0, size;
16713 struct common_block *common_block;
16714 struct symbol *sym;
16716 for (child_die = die->child;
16717 child_die && child_die->tag;
16718 child_die = sibling_die (child_die))
16721 size = (sizeof (struct common_block)
16722 + (n_entries - 1) * sizeof (struct symbol *));
16724 = (struct common_block *) obstack_alloc (&objfile->objfile_obstack,
16726 memset (common_block->contents, 0, n_entries * sizeof (struct symbol *));
16727 common_block->n_entries = 0;
16729 for (child_die = die->child;
16730 child_die && child_die->tag;
16731 child_die = sibling_die (child_die))
16733 /* Create the symbol in the DW_TAG_common_block block in the current
16735 sym = new_symbol (child_die, NULL, cu);
16738 struct attribute *member_loc;
16740 common_block->contents[common_block->n_entries++] = sym;
16742 member_loc = dwarf2_attr (child_die, DW_AT_data_member_location,
16746 /* GDB has handled this for a long time, but it is
16747 not specified by DWARF. It seems to have been
16748 emitted by gfortran at least as recently as:
16749 http://gcc.gnu.org/bugzilla/show_bug.cgi?id=23057. */
16750 complaint (&symfile_complaints,
16751 _("Variable in common block has "
16752 "DW_AT_data_member_location "
16753 "- DIE at %s [in module %s]"),
16754 sect_offset_str (child_die->sect_off),
16755 objfile_name (objfile));
16757 if (attr_form_is_section_offset (member_loc))
16758 dwarf2_complex_location_expr_complaint ();
16759 else if (attr_form_is_constant (member_loc)
16760 || attr_form_is_block (member_loc))
16763 mark_common_block_symbol_computed (sym, die, attr,
16767 dwarf2_complex_location_expr_complaint ();
16772 sym = new_symbol (die, objfile_type (objfile)->builtin_void, cu);
16773 SYMBOL_VALUE_COMMON_BLOCK (sym) = common_block;
16777 /* Create a type for a C++ namespace. */
16779 static struct type *
16780 read_namespace_type (struct die_info *die, struct dwarf2_cu *cu)
16782 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
16783 const char *previous_prefix, *name;
16787 /* For extensions, reuse the type of the original namespace. */
16788 if (dwarf2_attr (die, DW_AT_extension, cu) != NULL)
16790 struct die_info *ext_die;
16791 struct dwarf2_cu *ext_cu = cu;
16793 ext_die = dwarf2_extension (die, &ext_cu);
16794 type = read_type_die (ext_die, ext_cu);
16796 /* EXT_CU may not be the same as CU.
16797 Ensure TYPE is recorded with CU in die_type_hash. */
16798 return set_die_type (die, type, cu);
16801 name = namespace_name (die, &is_anonymous, cu);
16803 /* Now build the name of the current namespace. */
16805 previous_prefix = determine_prefix (die, cu);
16806 if (previous_prefix[0] != '\0')
16807 name = typename_concat (&objfile->objfile_obstack,
16808 previous_prefix, name, 0, cu);
16810 /* Create the type. */
16811 type = init_type (objfile, TYPE_CODE_NAMESPACE, 0, name);
16812 TYPE_TAG_NAME (type) = TYPE_NAME (type);
16814 return set_die_type (die, type, cu);
16817 /* Read a namespace scope. */
16820 read_namespace (struct die_info *die, struct dwarf2_cu *cu)
16822 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
16825 /* Add a symbol associated to this if we haven't seen the namespace
16826 before. Also, add a using directive if it's an anonymous
16829 if (dwarf2_attr (die, DW_AT_extension, cu) == NULL)
16833 type = read_type_die (die, cu);
16834 new_symbol (die, type, cu);
16836 namespace_name (die, &is_anonymous, cu);
16839 const char *previous_prefix = determine_prefix (die, cu);
16841 std::vector<const char *> excludes;
16842 add_using_directive (using_directives (cu->language),
16843 previous_prefix, TYPE_NAME (type), NULL,
16844 NULL, excludes, 0, &objfile->objfile_obstack);
16848 if (die->child != NULL)
16850 struct die_info *child_die = die->child;
16852 while (child_die && child_die->tag)
16854 process_die (child_die, cu);
16855 child_die = sibling_die (child_die);
16860 /* Read a Fortran module as type. This DIE can be only a declaration used for
16861 imported module. Still we need that type as local Fortran "use ... only"
16862 declaration imports depend on the created type in determine_prefix. */
16864 static struct type *
16865 read_module_type (struct die_info *die, struct dwarf2_cu *cu)
16867 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
16868 const char *module_name;
16871 module_name = dwarf2_name (die, cu);
16873 complaint (&symfile_complaints,
16874 _("DW_TAG_module has no name, offset %s"),
16875 sect_offset_str (die->sect_off));
16876 type = init_type (objfile, TYPE_CODE_MODULE, 0, module_name);
16878 /* determine_prefix uses TYPE_TAG_NAME. */
16879 TYPE_TAG_NAME (type) = TYPE_NAME (type);
16881 return set_die_type (die, type, cu);
16884 /* Read a Fortran module. */
16887 read_module (struct die_info *die, struct dwarf2_cu *cu)
16889 struct die_info *child_die = die->child;
16892 type = read_type_die (die, cu);
16893 new_symbol (die, type, cu);
16895 while (child_die && child_die->tag)
16897 process_die (child_die, cu);
16898 child_die = sibling_die (child_die);
16902 /* Return the name of the namespace represented by DIE. Set
16903 *IS_ANONYMOUS to tell whether or not the namespace is an anonymous
16906 static const char *
16907 namespace_name (struct die_info *die, int *is_anonymous, struct dwarf2_cu *cu)
16909 struct die_info *current_die;
16910 const char *name = NULL;
16912 /* Loop through the extensions until we find a name. */
16914 for (current_die = die;
16915 current_die != NULL;
16916 current_die = dwarf2_extension (die, &cu))
16918 /* We don't use dwarf2_name here so that we can detect the absence
16919 of a name -> anonymous namespace. */
16920 name = dwarf2_string_attr (die, DW_AT_name, cu);
16926 /* Is it an anonymous namespace? */
16928 *is_anonymous = (name == NULL);
16930 name = CP_ANONYMOUS_NAMESPACE_STR;
16935 /* Extract all information from a DW_TAG_pointer_type DIE and add to
16936 the user defined type vector. */
16938 static struct type *
16939 read_tag_pointer_type (struct die_info *die, struct dwarf2_cu *cu)
16941 struct gdbarch *gdbarch
16942 = get_objfile_arch (cu->per_cu->dwarf2_per_objfile->objfile);
16943 struct comp_unit_head *cu_header = &cu->header;
16945 struct attribute *attr_byte_size;
16946 struct attribute *attr_address_class;
16947 int byte_size, addr_class;
16948 struct type *target_type;
16950 target_type = die_type (die, cu);
16952 /* The die_type call above may have already set the type for this DIE. */
16953 type = get_die_type (die, cu);
16957 type = lookup_pointer_type (target_type);
16959 attr_byte_size = dwarf2_attr (die, DW_AT_byte_size, cu);
16960 if (attr_byte_size)
16961 byte_size = DW_UNSND (attr_byte_size);
16963 byte_size = cu_header->addr_size;
16965 attr_address_class = dwarf2_attr (die, DW_AT_address_class, cu);
16966 if (attr_address_class)
16967 addr_class = DW_UNSND (attr_address_class);
16969 addr_class = DW_ADDR_none;
16971 /* If the pointer size or address class is different than the
16972 default, create a type variant marked as such and set the
16973 length accordingly. */
16974 if (TYPE_LENGTH (type) != byte_size || addr_class != DW_ADDR_none)
16976 if (gdbarch_address_class_type_flags_p (gdbarch))
16980 type_flags = gdbarch_address_class_type_flags
16981 (gdbarch, byte_size, addr_class);
16982 gdb_assert ((type_flags & ~TYPE_INSTANCE_FLAG_ADDRESS_CLASS_ALL)
16984 type = make_type_with_address_space (type, type_flags);
16986 else if (TYPE_LENGTH (type) != byte_size)
16988 complaint (&symfile_complaints,
16989 _("invalid pointer size %d"), byte_size);
16993 /* Should we also complain about unhandled address classes? */
16997 TYPE_LENGTH (type) = byte_size;
16998 return set_die_type (die, type, cu);
17001 /* Extract all information from a DW_TAG_ptr_to_member_type DIE and add to
17002 the user defined type vector. */
17004 static struct type *
17005 read_tag_ptr_to_member_type (struct die_info *die, struct dwarf2_cu *cu)
17008 struct type *to_type;
17009 struct type *domain;
17011 to_type = die_type (die, cu);
17012 domain = die_containing_type (die, cu);
17014 /* The calls above may have already set the type for this DIE. */
17015 type = get_die_type (die, cu);
17019 if (TYPE_CODE (check_typedef (to_type)) == TYPE_CODE_METHOD)
17020 type = lookup_methodptr_type (to_type);
17021 else if (TYPE_CODE (check_typedef (to_type)) == TYPE_CODE_FUNC)
17023 struct type *new_type
17024 = alloc_type (cu->per_cu->dwarf2_per_objfile->objfile);
17026 smash_to_method_type (new_type, domain, TYPE_TARGET_TYPE (to_type),
17027 TYPE_FIELDS (to_type), TYPE_NFIELDS (to_type),
17028 TYPE_VARARGS (to_type));
17029 type = lookup_methodptr_type (new_type);
17032 type = lookup_memberptr_type (to_type, domain);
17034 return set_die_type (die, type, cu);
17037 /* Extract all information from a DW_TAG_{rvalue_,}reference_type DIE and add to
17038 the user defined type vector. */
17040 static struct type *
17041 read_tag_reference_type (struct die_info *die, struct dwarf2_cu *cu,
17042 enum type_code refcode)
17044 struct comp_unit_head *cu_header = &cu->header;
17045 struct type *type, *target_type;
17046 struct attribute *attr;
17048 gdb_assert (refcode == TYPE_CODE_REF || refcode == TYPE_CODE_RVALUE_REF);
17050 target_type = die_type (die, cu);
17052 /* The die_type call above may have already set the type for this DIE. */
17053 type = get_die_type (die, cu);
17057 type = lookup_reference_type (target_type, refcode);
17058 attr = dwarf2_attr (die, DW_AT_byte_size, cu);
17061 TYPE_LENGTH (type) = DW_UNSND (attr);
17065 TYPE_LENGTH (type) = cu_header->addr_size;
17067 return set_die_type (die, type, cu);
17070 /* Add the given cv-qualifiers to the element type of the array. GCC
17071 outputs DWARF type qualifiers that apply to an array, not the
17072 element type. But GDB relies on the array element type to carry
17073 the cv-qualifiers. This mimics section 6.7.3 of the C99
17076 static struct type *
17077 add_array_cv_type (struct die_info *die, struct dwarf2_cu *cu,
17078 struct type *base_type, int cnst, int voltl)
17080 struct type *el_type, *inner_array;
17082 base_type = copy_type (base_type);
17083 inner_array = base_type;
17085 while (TYPE_CODE (TYPE_TARGET_TYPE (inner_array)) == TYPE_CODE_ARRAY)
17087 TYPE_TARGET_TYPE (inner_array) =
17088 copy_type (TYPE_TARGET_TYPE (inner_array));
17089 inner_array = TYPE_TARGET_TYPE (inner_array);
17092 el_type = TYPE_TARGET_TYPE (inner_array);
17093 cnst |= TYPE_CONST (el_type);
17094 voltl |= TYPE_VOLATILE (el_type);
17095 TYPE_TARGET_TYPE (inner_array) = make_cv_type (cnst, voltl, el_type, NULL);
17097 return set_die_type (die, base_type, cu);
17100 static struct type *
17101 read_tag_const_type (struct die_info *die, struct dwarf2_cu *cu)
17103 struct type *base_type, *cv_type;
17105 base_type = die_type (die, cu);
17107 /* The die_type call above may have already set the type for this DIE. */
17108 cv_type = get_die_type (die, cu);
17112 /* In case the const qualifier is applied to an array type, the element type
17113 is so qualified, not the array type (section 6.7.3 of C99). */
17114 if (TYPE_CODE (base_type) == TYPE_CODE_ARRAY)
17115 return add_array_cv_type (die, cu, base_type, 1, 0);
17117 cv_type = make_cv_type (1, TYPE_VOLATILE (base_type), base_type, 0);
17118 return set_die_type (die, cv_type, cu);
17121 static struct type *
17122 read_tag_volatile_type (struct die_info *die, struct dwarf2_cu *cu)
17124 struct type *base_type, *cv_type;
17126 base_type = die_type (die, cu);
17128 /* The die_type call above may have already set the type for this DIE. */
17129 cv_type = get_die_type (die, cu);
17133 /* In case the volatile qualifier is applied to an array type, the
17134 element type is so qualified, not the array type (section 6.7.3
17136 if (TYPE_CODE (base_type) == TYPE_CODE_ARRAY)
17137 return add_array_cv_type (die, cu, base_type, 0, 1);
17139 cv_type = make_cv_type (TYPE_CONST (base_type), 1, base_type, 0);
17140 return set_die_type (die, cv_type, cu);
17143 /* Handle DW_TAG_restrict_type. */
17145 static struct type *
17146 read_tag_restrict_type (struct die_info *die, struct dwarf2_cu *cu)
17148 struct type *base_type, *cv_type;
17150 base_type = die_type (die, cu);
17152 /* The die_type call above may have already set the type for this DIE. */
17153 cv_type = get_die_type (die, cu);
17157 cv_type = make_restrict_type (base_type);
17158 return set_die_type (die, cv_type, cu);
17161 /* Handle DW_TAG_atomic_type. */
17163 static struct type *
17164 read_tag_atomic_type (struct die_info *die, struct dwarf2_cu *cu)
17166 struct type *base_type, *cv_type;
17168 base_type = die_type (die, cu);
17170 /* The die_type call above may have already set the type for this DIE. */
17171 cv_type = get_die_type (die, cu);
17175 cv_type = make_atomic_type (base_type);
17176 return set_die_type (die, cv_type, cu);
17179 /* Extract all information from a DW_TAG_string_type DIE and add to
17180 the user defined type vector. It isn't really a user defined type,
17181 but it behaves like one, with other DIE's using an AT_user_def_type
17182 attribute to reference it. */
17184 static struct type *
17185 read_tag_string_type (struct die_info *die, struct dwarf2_cu *cu)
17187 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
17188 struct gdbarch *gdbarch = get_objfile_arch (objfile);
17189 struct type *type, *range_type, *index_type, *char_type;
17190 struct attribute *attr;
17191 unsigned int length;
17193 attr = dwarf2_attr (die, DW_AT_string_length, cu);
17196 length = DW_UNSND (attr);
17200 /* Check for the DW_AT_byte_size attribute. */
17201 attr = dwarf2_attr (die, DW_AT_byte_size, cu);
17204 length = DW_UNSND (attr);
17212 index_type = objfile_type (objfile)->builtin_int;
17213 range_type = create_static_range_type (NULL, index_type, 1, length);
17214 char_type = language_string_char_type (cu->language_defn, gdbarch);
17215 type = create_string_type (NULL, char_type, range_type);
17217 return set_die_type (die, type, cu);
17220 /* Assuming that DIE corresponds to a function, returns nonzero
17221 if the function is prototyped. */
17224 prototyped_function_p (struct die_info *die, struct dwarf2_cu *cu)
17226 struct attribute *attr;
17228 attr = dwarf2_attr (die, DW_AT_prototyped, cu);
17229 if (attr && (DW_UNSND (attr) != 0))
17232 /* The DWARF standard implies that the DW_AT_prototyped attribute
17233 is only meaninful for C, but the concept also extends to other
17234 languages that allow unprototyped functions (Eg: Objective C).
17235 For all other languages, assume that functions are always
17237 if (cu->language != language_c
17238 && cu->language != language_objc
17239 && cu->language != language_opencl)
17242 /* RealView does not emit DW_AT_prototyped. We can not distinguish
17243 prototyped and unprototyped functions; default to prototyped,
17244 since that is more common in modern code (and RealView warns
17245 about unprototyped functions). */
17246 if (producer_is_realview (cu->producer))
17252 /* Handle DIES due to C code like:
17256 int (*funcp)(int a, long l);
17260 ('funcp' generates a DW_TAG_subroutine_type DIE). */
17262 static struct type *
17263 read_subroutine_type (struct die_info *die, struct dwarf2_cu *cu)
17265 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
17266 struct type *type; /* Type that this function returns. */
17267 struct type *ftype; /* Function that returns above type. */
17268 struct attribute *attr;
17270 type = die_type (die, cu);
17272 /* The die_type call above may have already set the type for this DIE. */
17273 ftype = get_die_type (die, cu);
17277 ftype = lookup_function_type (type);
17279 if (prototyped_function_p (die, cu))
17280 TYPE_PROTOTYPED (ftype) = 1;
17282 /* Store the calling convention in the type if it's available in
17283 the subroutine die. Otherwise set the calling convention to
17284 the default value DW_CC_normal. */
17285 attr = dwarf2_attr (die, DW_AT_calling_convention, cu);
17287 TYPE_CALLING_CONVENTION (ftype) = DW_UNSND (attr);
17288 else if (cu->producer && strstr (cu->producer, "IBM XL C for OpenCL"))
17289 TYPE_CALLING_CONVENTION (ftype) = DW_CC_GDB_IBM_OpenCL;
17291 TYPE_CALLING_CONVENTION (ftype) = DW_CC_normal;
17293 /* Record whether the function returns normally to its caller or not
17294 if the DWARF producer set that information. */
17295 attr = dwarf2_attr (die, DW_AT_noreturn, cu);
17296 if (attr && (DW_UNSND (attr) != 0))
17297 TYPE_NO_RETURN (ftype) = 1;
17299 /* We need to add the subroutine type to the die immediately so
17300 we don't infinitely recurse when dealing with parameters
17301 declared as the same subroutine type. */
17302 set_die_type (die, ftype, cu);
17304 if (die->child != NULL)
17306 struct type *void_type = objfile_type (objfile)->builtin_void;
17307 struct die_info *child_die;
17308 int nparams, iparams;
17310 /* Count the number of parameters.
17311 FIXME: GDB currently ignores vararg functions, but knows about
17312 vararg member functions. */
17314 child_die = die->child;
17315 while (child_die && child_die->tag)
17317 if (child_die->tag == DW_TAG_formal_parameter)
17319 else if (child_die->tag == DW_TAG_unspecified_parameters)
17320 TYPE_VARARGS (ftype) = 1;
17321 child_die = sibling_die (child_die);
17324 /* Allocate storage for parameters and fill them in. */
17325 TYPE_NFIELDS (ftype) = nparams;
17326 TYPE_FIELDS (ftype) = (struct field *)
17327 TYPE_ZALLOC (ftype, nparams * sizeof (struct field));
17329 /* TYPE_FIELD_TYPE must never be NULL. Pre-fill the array to ensure it
17330 even if we error out during the parameters reading below. */
17331 for (iparams = 0; iparams < nparams; iparams++)
17332 TYPE_FIELD_TYPE (ftype, iparams) = void_type;
17335 child_die = die->child;
17336 while (child_die && child_die->tag)
17338 if (child_die->tag == DW_TAG_formal_parameter)
17340 struct type *arg_type;
17342 /* DWARF version 2 has no clean way to discern C++
17343 static and non-static member functions. G++ helps
17344 GDB by marking the first parameter for non-static
17345 member functions (which is the this pointer) as
17346 artificial. We pass this information to
17347 dwarf2_add_member_fn via TYPE_FIELD_ARTIFICIAL.
17349 DWARF version 3 added DW_AT_object_pointer, which GCC
17350 4.5 does not yet generate. */
17351 attr = dwarf2_attr (child_die, DW_AT_artificial, cu);
17353 TYPE_FIELD_ARTIFICIAL (ftype, iparams) = DW_UNSND (attr);
17355 TYPE_FIELD_ARTIFICIAL (ftype, iparams) = 0;
17356 arg_type = die_type (child_die, cu);
17358 /* RealView does not mark THIS as const, which the testsuite
17359 expects. GCC marks THIS as const in method definitions,
17360 but not in the class specifications (GCC PR 43053). */
17361 if (cu->language == language_cplus && !TYPE_CONST (arg_type)
17362 && TYPE_FIELD_ARTIFICIAL (ftype, iparams))
17365 struct dwarf2_cu *arg_cu = cu;
17366 const char *name = dwarf2_name (child_die, cu);
17368 attr = dwarf2_attr (die, DW_AT_object_pointer, cu);
17371 /* If the compiler emits this, use it. */
17372 if (follow_die_ref (die, attr, &arg_cu) == child_die)
17375 else if (name && strcmp (name, "this") == 0)
17376 /* Function definitions will have the argument names. */
17378 else if (name == NULL && iparams == 0)
17379 /* Declarations may not have the names, so like
17380 elsewhere in GDB, assume an artificial first
17381 argument is "this". */
17385 arg_type = make_cv_type (1, TYPE_VOLATILE (arg_type),
17389 TYPE_FIELD_TYPE (ftype, iparams) = arg_type;
17392 child_die = sibling_die (child_die);
17399 static struct type *
17400 read_typedef (struct die_info *die, struct dwarf2_cu *cu)
17402 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
17403 const char *name = NULL;
17404 struct type *this_type, *target_type;
17406 name = dwarf2_full_name (NULL, die, cu);
17407 this_type = init_type (objfile, TYPE_CODE_TYPEDEF, 0, name);
17408 TYPE_TARGET_STUB (this_type) = 1;
17409 set_die_type (die, this_type, cu);
17410 target_type = die_type (die, cu);
17411 if (target_type != this_type)
17412 TYPE_TARGET_TYPE (this_type) = target_type;
17415 /* Self-referential typedefs are, it seems, not allowed by the DWARF
17416 spec and cause infinite loops in GDB. */
17417 complaint (&symfile_complaints,
17418 _("Self-referential DW_TAG_typedef "
17419 "- DIE at %s [in module %s]"),
17420 sect_offset_str (die->sect_off), objfile_name (objfile));
17421 TYPE_TARGET_TYPE (this_type) = NULL;
17426 /* Allocate a floating-point type of size BITS and name NAME. Pass NAME_HINT
17427 (which may be different from NAME) to the architecture back-end to allow
17428 it to guess the correct format if necessary. */
17430 static struct type *
17431 dwarf2_init_float_type (struct objfile *objfile, int bits, const char *name,
17432 const char *name_hint)
17434 struct gdbarch *gdbarch = get_objfile_arch (objfile);
17435 const struct floatformat **format;
17438 format = gdbarch_floatformat_for_type (gdbarch, name_hint, bits);
17440 type = init_float_type (objfile, bits, name, format);
17442 type = init_type (objfile, TYPE_CODE_ERROR, bits, name);
17447 /* Find a representation of a given base type and install
17448 it in the TYPE field of the die. */
17450 static struct type *
17451 read_base_type (struct die_info *die, struct dwarf2_cu *cu)
17453 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
17455 struct attribute *attr;
17456 int encoding = 0, bits = 0;
17459 attr = dwarf2_attr (die, DW_AT_encoding, cu);
17462 encoding = DW_UNSND (attr);
17464 attr = dwarf2_attr (die, DW_AT_byte_size, cu);
17467 bits = DW_UNSND (attr) * TARGET_CHAR_BIT;
17469 name = dwarf2_name (die, cu);
17472 complaint (&symfile_complaints,
17473 _("DW_AT_name missing from DW_TAG_base_type"));
17478 case DW_ATE_address:
17479 /* Turn DW_ATE_address into a void * pointer. */
17480 type = init_type (objfile, TYPE_CODE_VOID, TARGET_CHAR_BIT, NULL);
17481 type = init_pointer_type (objfile, bits, name, type);
17483 case DW_ATE_boolean:
17484 type = init_boolean_type (objfile, bits, 1, name);
17486 case DW_ATE_complex_float:
17487 type = dwarf2_init_float_type (objfile, bits / 2, NULL, name);
17488 type = init_complex_type (objfile, name, type);
17490 case DW_ATE_decimal_float:
17491 type = init_decfloat_type (objfile, bits, name);
17494 type = dwarf2_init_float_type (objfile, bits, name, name);
17496 case DW_ATE_signed:
17497 type = init_integer_type (objfile, bits, 0, name);
17499 case DW_ATE_unsigned:
17500 if (cu->language == language_fortran
17502 && startswith (name, "character("))
17503 type = init_character_type (objfile, bits, 1, name);
17505 type = init_integer_type (objfile, bits, 1, name);
17507 case DW_ATE_signed_char:
17508 if (cu->language == language_ada || cu->language == language_m2
17509 || cu->language == language_pascal
17510 || cu->language == language_fortran)
17511 type = init_character_type (objfile, bits, 0, name);
17513 type = init_integer_type (objfile, bits, 0, name);
17515 case DW_ATE_unsigned_char:
17516 if (cu->language == language_ada || cu->language == language_m2
17517 || cu->language == language_pascal
17518 || cu->language == language_fortran
17519 || cu->language == language_rust)
17520 type = init_character_type (objfile, bits, 1, name);
17522 type = init_integer_type (objfile, bits, 1, name);
17526 gdbarch *arch = get_objfile_arch (objfile);
17529 type = builtin_type (arch)->builtin_char16;
17530 else if (bits == 32)
17531 type = builtin_type (arch)->builtin_char32;
17534 complaint (&symfile_complaints,
17535 _("unsupported DW_ATE_UTF bit size: '%d'"),
17537 type = init_integer_type (objfile, bits, 1, name);
17539 return set_die_type (die, type, cu);
17544 complaint (&symfile_complaints, _("unsupported DW_AT_encoding: '%s'"),
17545 dwarf_type_encoding_name (encoding));
17546 type = init_type (objfile, TYPE_CODE_ERROR, bits, name);
17550 if (name && strcmp (name, "char") == 0)
17551 TYPE_NOSIGN (type) = 1;
17553 return set_die_type (die, type, cu);
17556 /* Parse dwarf attribute if it's a block, reference or constant and put the
17557 resulting value of the attribute into struct bound_prop.
17558 Returns 1 if ATTR could be resolved into PROP, 0 otherwise. */
17561 attr_to_dynamic_prop (const struct attribute *attr, struct die_info *die,
17562 struct dwarf2_cu *cu, struct dynamic_prop *prop)
17564 struct dwarf2_property_baton *baton;
17565 struct obstack *obstack
17566 = &cu->per_cu->dwarf2_per_objfile->objfile->objfile_obstack;
17568 if (attr == NULL || prop == NULL)
17571 if (attr_form_is_block (attr))
17573 baton = XOBNEW (obstack, struct dwarf2_property_baton);
17574 baton->referenced_type = NULL;
17575 baton->locexpr.per_cu = cu->per_cu;
17576 baton->locexpr.size = DW_BLOCK (attr)->size;
17577 baton->locexpr.data = DW_BLOCK (attr)->data;
17578 prop->data.baton = baton;
17579 prop->kind = PROP_LOCEXPR;
17580 gdb_assert (prop->data.baton != NULL);
17582 else if (attr_form_is_ref (attr))
17584 struct dwarf2_cu *target_cu = cu;
17585 struct die_info *target_die;
17586 struct attribute *target_attr;
17588 target_die = follow_die_ref (die, attr, &target_cu);
17589 target_attr = dwarf2_attr (target_die, DW_AT_location, target_cu);
17590 if (target_attr == NULL)
17591 target_attr = dwarf2_attr (target_die, DW_AT_data_member_location,
17593 if (target_attr == NULL)
17596 switch (target_attr->name)
17598 case DW_AT_location:
17599 if (attr_form_is_section_offset (target_attr))
17601 baton = XOBNEW (obstack, struct dwarf2_property_baton);
17602 baton->referenced_type = die_type (target_die, target_cu);
17603 fill_in_loclist_baton (cu, &baton->loclist, target_attr);
17604 prop->data.baton = baton;
17605 prop->kind = PROP_LOCLIST;
17606 gdb_assert (prop->data.baton != NULL);
17608 else if (attr_form_is_block (target_attr))
17610 baton = XOBNEW (obstack, struct dwarf2_property_baton);
17611 baton->referenced_type = die_type (target_die, target_cu);
17612 baton->locexpr.per_cu = cu->per_cu;
17613 baton->locexpr.size = DW_BLOCK (target_attr)->size;
17614 baton->locexpr.data = DW_BLOCK (target_attr)->data;
17615 prop->data.baton = baton;
17616 prop->kind = PROP_LOCEXPR;
17617 gdb_assert (prop->data.baton != NULL);
17621 dwarf2_invalid_attrib_class_complaint ("DW_AT_location",
17622 "dynamic property");
17626 case DW_AT_data_member_location:
17630 if (!handle_data_member_location (target_die, target_cu,
17634 baton = XOBNEW (obstack, struct dwarf2_property_baton);
17635 baton->referenced_type = read_type_die (target_die->parent,
17637 baton->offset_info.offset = offset;
17638 baton->offset_info.type = die_type (target_die, target_cu);
17639 prop->data.baton = baton;
17640 prop->kind = PROP_ADDR_OFFSET;
17645 else if (attr_form_is_constant (attr))
17647 prop->data.const_val = dwarf2_get_attr_constant_value (attr, 0);
17648 prop->kind = PROP_CONST;
17652 dwarf2_invalid_attrib_class_complaint (dwarf_form_name (attr->form),
17653 dwarf2_name (die, cu));
17660 /* Read the given DW_AT_subrange DIE. */
17662 static struct type *
17663 read_subrange_type (struct die_info *die, struct dwarf2_cu *cu)
17665 struct type *base_type, *orig_base_type;
17666 struct type *range_type;
17667 struct attribute *attr;
17668 struct dynamic_prop low, high;
17669 int low_default_is_valid;
17670 int high_bound_is_count = 0;
17672 LONGEST negative_mask;
17674 orig_base_type = die_type (die, cu);
17675 /* If ORIG_BASE_TYPE is a typedef, it will not be TYPE_UNSIGNED,
17676 whereas the real type might be. So, we use ORIG_BASE_TYPE when
17677 creating the range type, but we use the result of check_typedef
17678 when examining properties of the type. */
17679 base_type = check_typedef (orig_base_type);
17681 /* The die_type call above may have already set the type for this DIE. */
17682 range_type = get_die_type (die, cu);
17686 low.kind = PROP_CONST;
17687 high.kind = PROP_CONST;
17688 high.data.const_val = 0;
17690 /* Set LOW_DEFAULT_IS_VALID if current language and DWARF version allow
17691 omitting DW_AT_lower_bound. */
17692 switch (cu->language)
17695 case language_cplus:
17696 low.data.const_val = 0;
17697 low_default_is_valid = 1;
17699 case language_fortran:
17700 low.data.const_val = 1;
17701 low_default_is_valid = 1;
17704 case language_objc:
17705 case language_rust:
17706 low.data.const_val = 0;
17707 low_default_is_valid = (cu->header.version >= 4);
17711 case language_pascal:
17712 low.data.const_val = 1;
17713 low_default_is_valid = (cu->header.version >= 4);
17716 low.data.const_val = 0;
17717 low_default_is_valid = 0;
17721 attr = dwarf2_attr (die, DW_AT_lower_bound, cu);
17723 attr_to_dynamic_prop (attr, die, cu, &low);
17724 else if (!low_default_is_valid)
17725 complaint (&symfile_complaints, _("Missing DW_AT_lower_bound "
17726 "- DIE at %s [in module %s]"),
17727 sect_offset_str (die->sect_off),
17728 objfile_name (cu->per_cu->dwarf2_per_objfile->objfile));
17730 attr = dwarf2_attr (die, DW_AT_upper_bound, cu);
17731 if (!attr_to_dynamic_prop (attr, die, cu, &high))
17733 attr = dwarf2_attr (die, DW_AT_count, cu);
17734 if (attr_to_dynamic_prop (attr, die, cu, &high))
17736 /* If bounds are constant do the final calculation here. */
17737 if (low.kind == PROP_CONST && high.kind == PROP_CONST)
17738 high.data.const_val = low.data.const_val + high.data.const_val - 1;
17740 high_bound_is_count = 1;
17744 /* Dwarf-2 specifications explicitly allows to create subrange types
17745 without specifying a base type.
17746 In that case, the base type must be set to the type of
17747 the lower bound, upper bound or count, in that order, if any of these
17748 three attributes references an object that has a type.
17749 If no base type is found, the Dwarf-2 specifications say that
17750 a signed integer type of size equal to the size of an address should
17752 For the following C code: `extern char gdb_int [];'
17753 GCC produces an empty range DIE.
17754 FIXME: muller/2010-05-28: Possible references to object for low bound,
17755 high bound or count are not yet handled by this code. */
17756 if (TYPE_CODE (base_type) == TYPE_CODE_VOID)
17758 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
17759 struct gdbarch *gdbarch = get_objfile_arch (objfile);
17760 int addr_size = gdbarch_addr_bit (gdbarch) /8;
17761 struct type *int_type = objfile_type (objfile)->builtin_int;
17763 /* Test "int", "long int", and "long long int" objfile types,
17764 and select the first one having a size above or equal to the
17765 architecture address size. */
17766 if (int_type && TYPE_LENGTH (int_type) >= addr_size)
17767 base_type = int_type;
17770 int_type = objfile_type (objfile)->builtin_long;
17771 if (int_type && TYPE_LENGTH (int_type) >= addr_size)
17772 base_type = int_type;
17775 int_type = objfile_type (objfile)->builtin_long_long;
17776 if (int_type && TYPE_LENGTH (int_type) >= addr_size)
17777 base_type = int_type;
17782 /* Normally, the DWARF producers are expected to use a signed
17783 constant form (Eg. DW_FORM_sdata) to express negative bounds.
17784 But this is unfortunately not always the case, as witnessed
17785 with GCC, for instance, where the ambiguous DW_FORM_dataN form
17786 is used instead. To work around that ambiguity, we treat
17787 the bounds as signed, and thus sign-extend their values, when
17788 the base type is signed. */
17790 -((LONGEST) 1 << (TYPE_LENGTH (base_type) * TARGET_CHAR_BIT - 1));
17791 if (low.kind == PROP_CONST
17792 && !TYPE_UNSIGNED (base_type) && (low.data.const_val & negative_mask))
17793 low.data.const_val |= negative_mask;
17794 if (high.kind == PROP_CONST
17795 && !TYPE_UNSIGNED (base_type) && (high.data.const_val & negative_mask))
17796 high.data.const_val |= negative_mask;
17798 range_type = create_range_type (NULL, orig_base_type, &low, &high);
17800 if (high_bound_is_count)
17801 TYPE_RANGE_DATA (range_type)->flag_upper_bound_is_count = 1;
17803 /* Ada expects an empty array on no boundary attributes. */
17804 if (attr == NULL && cu->language != language_ada)
17805 TYPE_HIGH_BOUND_KIND (range_type) = PROP_UNDEFINED;
17807 name = dwarf2_name (die, cu);
17809 TYPE_NAME (range_type) = name;
17811 attr = dwarf2_attr (die, DW_AT_byte_size, cu);
17813 TYPE_LENGTH (range_type) = DW_UNSND (attr);
17815 set_die_type (die, range_type, cu);
17817 /* set_die_type should be already done. */
17818 set_descriptive_type (range_type, die, cu);
17823 static struct type *
17824 read_unspecified_type (struct die_info *die, struct dwarf2_cu *cu)
17828 type = init_type (cu->per_cu->dwarf2_per_objfile->objfile, TYPE_CODE_VOID,0,
17830 TYPE_NAME (type) = dwarf2_name (die, cu);
17832 /* In Ada, an unspecified type is typically used when the description
17833 of the type is defered to a different unit. When encountering
17834 such a type, we treat it as a stub, and try to resolve it later on,
17836 if (cu->language == language_ada)
17837 TYPE_STUB (type) = 1;
17839 return set_die_type (die, type, cu);
17842 /* Read a single die and all its descendents. Set the die's sibling
17843 field to NULL; set other fields in the die correctly, and set all
17844 of the descendents' fields correctly. Set *NEW_INFO_PTR to the
17845 location of the info_ptr after reading all of those dies. PARENT
17846 is the parent of the die in question. */
17848 static struct die_info *
17849 read_die_and_children (const struct die_reader_specs *reader,
17850 const gdb_byte *info_ptr,
17851 const gdb_byte **new_info_ptr,
17852 struct die_info *parent)
17854 struct die_info *die;
17855 const gdb_byte *cur_ptr;
17858 cur_ptr = read_full_die_1 (reader, &die, info_ptr, &has_children, 0);
17861 *new_info_ptr = cur_ptr;
17864 store_in_ref_table (die, reader->cu);
17867 die->child = read_die_and_siblings_1 (reader, cur_ptr, new_info_ptr, die);
17871 *new_info_ptr = cur_ptr;
17874 die->sibling = NULL;
17875 die->parent = parent;
17879 /* Read a die, all of its descendents, and all of its siblings; set
17880 all of the fields of all of the dies correctly. Arguments are as
17881 in read_die_and_children. */
17883 static struct die_info *
17884 read_die_and_siblings_1 (const struct die_reader_specs *reader,
17885 const gdb_byte *info_ptr,
17886 const gdb_byte **new_info_ptr,
17887 struct die_info *parent)
17889 struct die_info *first_die, *last_sibling;
17890 const gdb_byte *cur_ptr;
17892 cur_ptr = info_ptr;
17893 first_die = last_sibling = NULL;
17897 struct die_info *die
17898 = read_die_and_children (reader, cur_ptr, &cur_ptr, parent);
17902 *new_info_ptr = cur_ptr;
17909 last_sibling->sibling = die;
17911 last_sibling = die;
17915 /* Read a die, all of its descendents, and all of its siblings; set
17916 all of the fields of all of the dies correctly. Arguments are as
17917 in read_die_and_children.
17918 This the main entry point for reading a DIE and all its children. */
17920 static struct die_info *
17921 read_die_and_siblings (const struct die_reader_specs *reader,
17922 const gdb_byte *info_ptr,
17923 const gdb_byte **new_info_ptr,
17924 struct die_info *parent)
17926 struct die_info *die = read_die_and_siblings_1 (reader, info_ptr,
17927 new_info_ptr, parent);
17929 if (dwarf_die_debug)
17931 fprintf_unfiltered (gdb_stdlog,
17932 "Read die from %s@0x%x of %s:\n",
17933 get_section_name (reader->die_section),
17934 (unsigned) (info_ptr - reader->die_section->buffer),
17935 bfd_get_filename (reader->abfd));
17936 dump_die (die, dwarf_die_debug);
17942 /* Read a die and all its attributes, leave space for NUM_EXTRA_ATTRS
17944 The caller is responsible for filling in the extra attributes
17945 and updating (*DIEP)->num_attrs.
17946 Set DIEP to point to a newly allocated die with its information,
17947 except for its child, sibling, and parent fields.
17948 Set HAS_CHILDREN to tell whether the die has children or not. */
17950 static const gdb_byte *
17951 read_full_die_1 (const struct die_reader_specs *reader,
17952 struct die_info **diep, const gdb_byte *info_ptr,
17953 int *has_children, int num_extra_attrs)
17955 unsigned int abbrev_number, bytes_read, i;
17956 struct abbrev_info *abbrev;
17957 struct die_info *die;
17958 struct dwarf2_cu *cu = reader->cu;
17959 bfd *abfd = reader->abfd;
17961 sect_offset sect_off = (sect_offset) (info_ptr - reader->buffer);
17962 abbrev_number = read_unsigned_leb128 (abfd, info_ptr, &bytes_read);
17963 info_ptr += bytes_read;
17964 if (!abbrev_number)
17971 abbrev = reader->abbrev_table->lookup_abbrev (abbrev_number);
17973 error (_("Dwarf Error: could not find abbrev number %d [in module %s]"),
17975 bfd_get_filename (abfd));
17977 die = dwarf_alloc_die (cu, abbrev->num_attrs + num_extra_attrs);
17978 die->sect_off = sect_off;
17979 die->tag = abbrev->tag;
17980 die->abbrev = abbrev_number;
17982 /* Make the result usable.
17983 The caller needs to update num_attrs after adding the extra
17985 die->num_attrs = abbrev->num_attrs;
17987 for (i = 0; i < abbrev->num_attrs; ++i)
17988 info_ptr = read_attribute (reader, &die->attrs[i], &abbrev->attrs[i],
17992 *has_children = abbrev->has_children;
17996 /* Read a die and all its attributes.
17997 Set DIEP to point to a newly allocated die with its information,
17998 except for its child, sibling, and parent fields.
17999 Set HAS_CHILDREN to tell whether the die has children or not. */
18001 static const gdb_byte *
18002 read_full_die (const struct die_reader_specs *reader,
18003 struct die_info **diep, const gdb_byte *info_ptr,
18006 const gdb_byte *result;
18008 result = read_full_die_1 (reader, diep, info_ptr, has_children, 0);
18010 if (dwarf_die_debug)
18012 fprintf_unfiltered (gdb_stdlog,
18013 "Read die from %s@0x%x of %s:\n",
18014 get_section_name (reader->die_section),
18015 (unsigned) (info_ptr - reader->die_section->buffer),
18016 bfd_get_filename (reader->abfd));
18017 dump_die (*diep, dwarf_die_debug);
18023 /* Abbreviation tables.
18025 In DWARF version 2, the description of the debugging information is
18026 stored in a separate .debug_abbrev section. Before we read any
18027 dies from a section we read in all abbreviations and install them
18028 in a hash table. */
18030 /* Allocate space for a struct abbrev_info object in ABBREV_TABLE. */
18032 struct abbrev_info *
18033 abbrev_table::alloc_abbrev ()
18035 struct abbrev_info *abbrev;
18037 abbrev = XOBNEW (&abbrev_obstack, struct abbrev_info);
18038 memset (abbrev, 0, sizeof (struct abbrev_info));
18043 /* Add an abbreviation to the table. */
18046 abbrev_table::add_abbrev (unsigned int abbrev_number,
18047 struct abbrev_info *abbrev)
18049 unsigned int hash_number;
18051 hash_number = abbrev_number % ABBREV_HASH_SIZE;
18052 abbrev->next = m_abbrevs[hash_number];
18053 m_abbrevs[hash_number] = abbrev;
18056 /* Look up an abbrev in the table.
18057 Returns NULL if the abbrev is not found. */
18059 struct abbrev_info *
18060 abbrev_table::lookup_abbrev (unsigned int abbrev_number)
18062 unsigned int hash_number;
18063 struct abbrev_info *abbrev;
18065 hash_number = abbrev_number % ABBREV_HASH_SIZE;
18066 abbrev = m_abbrevs[hash_number];
18070 if (abbrev->number == abbrev_number)
18072 abbrev = abbrev->next;
18077 /* Read in an abbrev table. */
18079 static abbrev_table_up
18080 abbrev_table_read_table (struct dwarf2_per_objfile *dwarf2_per_objfile,
18081 struct dwarf2_section_info *section,
18082 sect_offset sect_off)
18084 struct objfile *objfile = dwarf2_per_objfile->objfile;
18085 bfd *abfd = get_section_bfd_owner (section);
18086 const gdb_byte *abbrev_ptr;
18087 struct abbrev_info *cur_abbrev;
18088 unsigned int abbrev_number, bytes_read, abbrev_name;
18089 unsigned int abbrev_form;
18090 struct attr_abbrev *cur_attrs;
18091 unsigned int allocated_attrs;
18093 abbrev_table_up abbrev_table (new struct abbrev_table (sect_off));
18095 dwarf2_read_section (objfile, section);
18096 abbrev_ptr = section->buffer + to_underlying (sect_off);
18097 abbrev_number = read_unsigned_leb128 (abfd, abbrev_ptr, &bytes_read);
18098 abbrev_ptr += bytes_read;
18100 allocated_attrs = ATTR_ALLOC_CHUNK;
18101 cur_attrs = XNEWVEC (struct attr_abbrev, allocated_attrs);
18103 /* Loop until we reach an abbrev number of 0. */
18104 while (abbrev_number)
18106 cur_abbrev = abbrev_table->alloc_abbrev ();
18108 /* read in abbrev header */
18109 cur_abbrev->number = abbrev_number;
18111 = (enum dwarf_tag) read_unsigned_leb128 (abfd, abbrev_ptr, &bytes_read);
18112 abbrev_ptr += bytes_read;
18113 cur_abbrev->has_children = read_1_byte (abfd, abbrev_ptr);
18116 /* now read in declarations */
18119 LONGEST implicit_const;
18121 abbrev_name = read_unsigned_leb128 (abfd, abbrev_ptr, &bytes_read);
18122 abbrev_ptr += bytes_read;
18123 abbrev_form = read_unsigned_leb128 (abfd, abbrev_ptr, &bytes_read);
18124 abbrev_ptr += bytes_read;
18125 if (abbrev_form == DW_FORM_implicit_const)
18127 implicit_const = read_signed_leb128 (abfd, abbrev_ptr,
18129 abbrev_ptr += bytes_read;
18133 /* Initialize it due to a false compiler warning. */
18134 implicit_const = -1;
18137 if (abbrev_name == 0)
18140 if (cur_abbrev->num_attrs == allocated_attrs)
18142 allocated_attrs += ATTR_ALLOC_CHUNK;
18144 = XRESIZEVEC (struct attr_abbrev, cur_attrs, allocated_attrs);
18147 cur_attrs[cur_abbrev->num_attrs].name
18148 = (enum dwarf_attribute) abbrev_name;
18149 cur_attrs[cur_abbrev->num_attrs].form
18150 = (enum dwarf_form) abbrev_form;
18151 cur_attrs[cur_abbrev->num_attrs].implicit_const = implicit_const;
18152 ++cur_abbrev->num_attrs;
18155 cur_abbrev->attrs =
18156 XOBNEWVEC (&abbrev_table->abbrev_obstack, struct attr_abbrev,
18157 cur_abbrev->num_attrs);
18158 memcpy (cur_abbrev->attrs, cur_attrs,
18159 cur_abbrev->num_attrs * sizeof (struct attr_abbrev));
18161 abbrev_table->add_abbrev (abbrev_number, cur_abbrev);
18163 /* Get next abbreviation.
18164 Under Irix6 the abbreviations for a compilation unit are not
18165 always properly terminated with an abbrev number of 0.
18166 Exit loop if we encounter an abbreviation which we have
18167 already read (which means we are about to read the abbreviations
18168 for the next compile unit) or if the end of the abbreviation
18169 table is reached. */
18170 if ((unsigned int) (abbrev_ptr - section->buffer) >= section->size)
18172 abbrev_number = read_unsigned_leb128 (abfd, abbrev_ptr, &bytes_read);
18173 abbrev_ptr += bytes_read;
18174 if (abbrev_table->lookup_abbrev (abbrev_number) != NULL)
18179 return abbrev_table;
18182 /* Returns nonzero if TAG represents a type that we might generate a partial
18186 is_type_tag_for_partial (int tag)
18191 /* Some types that would be reasonable to generate partial symbols for,
18192 that we don't at present. */
18193 case DW_TAG_array_type:
18194 case DW_TAG_file_type:
18195 case DW_TAG_ptr_to_member_type:
18196 case DW_TAG_set_type:
18197 case DW_TAG_string_type:
18198 case DW_TAG_subroutine_type:
18200 case DW_TAG_base_type:
18201 case DW_TAG_class_type:
18202 case DW_TAG_interface_type:
18203 case DW_TAG_enumeration_type:
18204 case DW_TAG_structure_type:
18205 case DW_TAG_subrange_type:
18206 case DW_TAG_typedef:
18207 case DW_TAG_union_type:
18214 /* Load all DIEs that are interesting for partial symbols into memory. */
18216 static struct partial_die_info *
18217 load_partial_dies (const struct die_reader_specs *reader,
18218 const gdb_byte *info_ptr, int building_psymtab)
18220 struct dwarf2_cu *cu = reader->cu;
18221 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
18222 struct partial_die_info *parent_die, *last_die, *first_die = NULL;
18223 unsigned int bytes_read;
18224 unsigned int load_all = 0;
18225 int nesting_level = 1;
18230 gdb_assert (cu->per_cu != NULL);
18231 if (cu->per_cu->load_all_dies)
18235 = htab_create_alloc_ex (cu->header.length / 12,
18239 &cu->comp_unit_obstack,
18240 hashtab_obstack_allocate,
18241 dummy_obstack_deallocate);
18245 abbrev_info *abbrev = peek_die_abbrev (*reader, info_ptr, &bytes_read);
18247 /* A NULL abbrev means the end of a series of children. */
18248 if (abbrev == NULL)
18250 if (--nesting_level == 0)
18253 info_ptr += bytes_read;
18254 last_die = parent_die;
18255 parent_die = parent_die->die_parent;
18259 /* Check for template arguments. We never save these; if
18260 they're seen, we just mark the parent, and go on our way. */
18261 if (parent_die != NULL
18262 && cu->language == language_cplus
18263 && (abbrev->tag == DW_TAG_template_type_param
18264 || abbrev->tag == DW_TAG_template_value_param))
18266 parent_die->has_template_arguments = 1;
18270 /* We don't need a partial DIE for the template argument. */
18271 info_ptr = skip_one_die (reader, info_ptr + bytes_read, abbrev);
18276 /* We only recurse into c++ subprograms looking for template arguments.
18277 Skip their other children. */
18279 && cu->language == language_cplus
18280 && parent_die != NULL
18281 && parent_die->tag == DW_TAG_subprogram)
18283 info_ptr = skip_one_die (reader, info_ptr + bytes_read, abbrev);
18287 /* Check whether this DIE is interesting enough to save. Normally
18288 we would not be interested in members here, but there may be
18289 later variables referencing them via DW_AT_specification (for
18290 static members). */
18292 && !is_type_tag_for_partial (abbrev->tag)
18293 && abbrev->tag != DW_TAG_constant
18294 && abbrev->tag != DW_TAG_enumerator
18295 && abbrev->tag != DW_TAG_subprogram
18296 && abbrev->tag != DW_TAG_inlined_subroutine
18297 && abbrev->tag != DW_TAG_lexical_block
18298 && abbrev->tag != DW_TAG_variable
18299 && abbrev->tag != DW_TAG_namespace
18300 && abbrev->tag != DW_TAG_module
18301 && abbrev->tag != DW_TAG_member
18302 && abbrev->tag != DW_TAG_imported_unit
18303 && abbrev->tag != DW_TAG_imported_declaration)
18305 /* Otherwise we skip to the next sibling, if any. */
18306 info_ptr = skip_one_die (reader, info_ptr + bytes_read, abbrev);
18310 struct partial_die_info pdi;
18312 memset (&pdi, 0, sizeof (pdi));
18313 info_ptr = read_partial_die (reader, &pdi, *abbrev, bytes_read,
18316 /* This two-pass algorithm for processing partial symbols has a
18317 high cost in cache pressure. Thus, handle some simple cases
18318 here which cover the majority of C partial symbols. DIEs
18319 which neither have specification tags in them, nor could have
18320 specification tags elsewhere pointing at them, can simply be
18321 processed and discarded.
18323 This segment is also optional; scan_partial_symbols and
18324 add_partial_symbol will handle these DIEs if we chain
18325 them in normally. When compilers which do not emit large
18326 quantities of duplicate debug information are more common,
18327 this code can probably be removed. */
18329 /* Any complete simple types at the top level (pretty much all
18330 of them, for a language without namespaces), can be processed
18332 if (parent_die == NULL
18333 && pdi.has_specification == 0
18334 && pdi.is_declaration == 0
18335 && ((pdi.tag == DW_TAG_typedef && !pdi.has_children)
18336 || pdi.tag == DW_TAG_base_type
18337 || pdi.tag == DW_TAG_subrange_type))
18339 if (building_psymtab && pdi.name != NULL)
18340 add_psymbol_to_list (pdi.name, strlen (pdi.name), 0,
18341 VAR_DOMAIN, LOC_TYPEDEF,
18342 &objfile->static_psymbols,
18343 0, cu->language, objfile);
18344 info_ptr = locate_pdi_sibling (reader, &pdi, info_ptr);
18348 /* The exception for DW_TAG_typedef with has_children above is
18349 a workaround of GCC PR debug/47510. In the case of this complaint
18350 type_name_no_tag_or_error will error on such types later.
18352 GDB skipped children of DW_TAG_typedef by the shortcut above and then
18353 it could not find the child DIEs referenced later, this is checked
18354 above. In correct DWARF DW_TAG_typedef should have no children. */
18356 if (pdi.tag == DW_TAG_typedef && pdi.has_children)
18357 complaint (&symfile_complaints,
18358 _("DW_TAG_typedef has childen - GCC PR debug/47510 bug "
18359 "- DIE at %s [in module %s]"),
18360 sect_offset_str (pdi.sect_off), objfile_name (objfile));
18362 /* If we're at the second level, and we're an enumerator, and
18363 our parent has no specification (meaning possibly lives in a
18364 namespace elsewhere), then we can add the partial symbol now
18365 instead of queueing it. */
18366 if (pdi.tag == DW_TAG_enumerator
18367 && parent_die != NULL
18368 && parent_die->die_parent == NULL
18369 && parent_die->tag == DW_TAG_enumeration_type
18370 && parent_die->has_specification == 0)
18372 if (pdi.name == NULL)
18373 complaint (&symfile_complaints,
18374 _("malformed enumerator DIE ignored"));
18375 else if (building_psymtab)
18376 add_psymbol_to_list (pdi.name, strlen (pdi.name), 0,
18377 VAR_DOMAIN, LOC_CONST,
18378 cu->language == language_cplus
18379 ? &objfile->global_psymbols
18380 : &objfile->static_psymbols,
18381 0, cu->language, objfile);
18383 info_ptr = locate_pdi_sibling (reader, &pdi, info_ptr);
18387 struct partial_die_info *part_die
18388 = XOBNEW (&cu->comp_unit_obstack, struct partial_die_info);
18390 memcpy (part_die, &pdi, sizeof (pdi));
18391 /* We'll save this DIE so link it in. */
18392 part_die->die_parent = parent_die;
18393 part_die->die_sibling = NULL;
18394 part_die->die_child = NULL;
18396 if (last_die && last_die == parent_die)
18397 last_die->die_child = part_die;
18399 last_die->die_sibling = part_die;
18401 last_die = part_die;
18403 if (first_die == NULL)
18404 first_die = part_die;
18406 /* Maybe add the DIE to the hash table. Not all DIEs that we
18407 find interesting need to be in the hash table, because we
18408 also have the parent/sibling/child chains; only those that we
18409 might refer to by offset later during partial symbol reading.
18411 For now this means things that might have be the target of a
18412 DW_AT_specification, DW_AT_abstract_origin, or
18413 DW_AT_extension. DW_AT_extension will refer only to
18414 namespaces; DW_AT_abstract_origin refers to functions (and
18415 many things under the function DIE, but we do not recurse
18416 into function DIEs during partial symbol reading) and
18417 possibly variables as well; DW_AT_specification refers to
18418 declarations. Declarations ought to have the DW_AT_declaration
18419 flag. It happens that GCC forgets to put it in sometimes, but
18420 only for functions, not for types.
18422 Adding more things than necessary to the hash table is harmless
18423 except for the performance cost. Adding too few will result in
18424 wasted time in find_partial_die, when we reread the compilation
18425 unit with load_all_dies set. */
18428 || abbrev->tag == DW_TAG_constant
18429 || abbrev->tag == DW_TAG_subprogram
18430 || abbrev->tag == DW_TAG_variable
18431 || abbrev->tag == DW_TAG_namespace
18432 || part_die->is_declaration)
18436 slot = htab_find_slot_with_hash (cu->partial_dies, part_die,
18437 to_underlying (part_die->sect_off),
18442 /* For some DIEs we want to follow their children (if any). For C
18443 we have no reason to follow the children of structures; for other
18444 languages we have to, so that we can get at method physnames
18445 to infer fully qualified class names, for DW_AT_specification,
18446 and for C++ template arguments. For C++, we also look one level
18447 inside functions to find template arguments (if the name of the
18448 function does not already contain the template arguments).
18450 For Ada, we need to scan the children of subprograms and lexical
18451 blocks as well because Ada allows the definition of nested
18452 entities that could be interesting for the debugger, such as
18453 nested subprograms for instance. */
18454 if (last_die->has_children
18456 || last_die->tag == DW_TAG_namespace
18457 || last_die->tag == DW_TAG_module
18458 || last_die->tag == DW_TAG_enumeration_type
18459 || (cu->language == language_cplus
18460 && last_die->tag == DW_TAG_subprogram
18461 && (last_die->name == NULL
18462 || strchr (last_die->name, '<') == NULL))
18463 || (cu->language != language_c
18464 && (last_die->tag == DW_TAG_class_type
18465 || last_die->tag == DW_TAG_interface_type
18466 || last_die->tag == DW_TAG_structure_type
18467 || last_die->tag == DW_TAG_union_type))
18468 || (cu->language == language_ada
18469 && (last_die->tag == DW_TAG_subprogram
18470 || last_die->tag == DW_TAG_lexical_block))))
18473 parent_die = last_die;
18477 /* Otherwise we skip to the next sibling, if any. */
18478 info_ptr = locate_pdi_sibling (reader, last_die, info_ptr);
18480 /* Back to the top, do it again. */
18484 /* Read a minimal amount of information into the minimal die structure. */
18486 static const gdb_byte *
18487 read_partial_die (const struct die_reader_specs *reader,
18488 struct partial_die_info *part_die,
18489 const struct abbrev_info &abbrev, unsigned int abbrev_len,
18490 const gdb_byte *info_ptr)
18492 struct dwarf2_cu *cu = reader->cu;
18493 struct dwarf2_per_objfile *dwarf2_per_objfile
18494 = cu->per_cu->dwarf2_per_objfile;
18495 struct objfile *objfile = dwarf2_per_objfile->objfile;
18496 const gdb_byte *buffer = reader->buffer;
18498 struct attribute attr;
18499 int has_low_pc_attr = 0;
18500 int has_high_pc_attr = 0;
18501 int high_pc_relative = 0;
18503 memset (part_die, 0, sizeof (struct partial_die_info));
18505 part_die->sect_off = (sect_offset) (info_ptr - buffer);
18507 info_ptr += abbrev_len;
18509 part_die->tag = abbrev.tag;
18510 part_die->has_children = abbrev.has_children;
18512 for (i = 0; i < abbrev.num_attrs; ++i)
18514 info_ptr = read_attribute (reader, &attr, &abbrev.attrs[i], info_ptr);
18516 /* Store the data if it is of an attribute we want to keep in a
18517 partial symbol table. */
18521 switch (part_die->tag)
18523 case DW_TAG_compile_unit:
18524 case DW_TAG_partial_unit:
18525 case DW_TAG_type_unit:
18526 /* Compilation units have a DW_AT_name that is a filename, not
18527 a source language identifier. */
18528 case DW_TAG_enumeration_type:
18529 case DW_TAG_enumerator:
18530 /* These tags always have simple identifiers already; no need
18531 to canonicalize them. */
18532 part_die->name = DW_STRING (&attr);
18536 = dwarf2_canonicalize_name (DW_STRING (&attr), cu,
18537 &objfile->per_bfd->storage_obstack);
18541 case DW_AT_linkage_name:
18542 case DW_AT_MIPS_linkage_name:
18543 /* Note that both forms of linkage name might appear. We
18544 assume they will be the same, and we only store the last
18546 if (cu->language == language_ada)
18547 part_die->name = DW_STRING (&attr);
18548 part_die->linkage_name = DW_STRING (&attr);
18551 has_low_pc_attr = 1;
18552 part_die->lowpc = attr_value_as_address (&attr);
18554 case DW_AT_high_pc:
18555 has_high_pc_attr = 1;
18556 part_die->highpc = attr_value_as_address (&attr);
18557 if (cu->header.version >= 4 && attr_form_is_constant (&attr))
18558 high_pc_relative = 1;
18560 case DW_AT_location:
18561 /* Support the .debug_loc offsets. */
18562 if (attr_form_is_block (&attr))
18564 part_die->d.locdesc = DW_BLOCK (&attr);
18566 else if (attr_form_is_section_offset (&attr))
18568 dwarf2_complex_location_expr_complaint ();
18572 dwarf2_invalid_attrib_class_complaint ("DW_AT_location",
18573 "partial symbol information");
18576 case DW_AT_external:
18577 part_die->is_external = DW_UNSND (&attr);
18579 case DW_AT_declaration:
18580 part_die->is_declaration = DW_UNSND (&attr);
18583 part_die->has_type = 1;
18585 case DW_AT_abstract_origin:
18586 case DW_AT_specification:
18587 case DW_AT_extension:
18588 part_die->has_specification = 1;
18589 part_die->spec_offset = dwarf2_get_ref_die_offset (&attr);
18590 part_die->spec_is_dwz = (attr.form == DW_FORM_GNU_ref_alt
18591 || cu->per_cu->is_dwz);
18593 case DW_AT_sibling:
18594 /* Ignore absolute siblings, they might point outside of
18595 the current compile unit. */
18596 if (attr.form == DW_FORM_ref_addr)
18597 complaint (&symfile_complaints,
18598 _("ignoring absolute DW_AT_sibling"));
18601 sect_offset off = dwarf2_get_ref_die_offset (&attr);
18602 const gdb_byte *sibling_ptr = buffer + to_underlying (off);
18604 if (sibling_ptr < info_ptr)
18605 complaint (&symfile_complaints,
18606 _("DW_AT_sibling points backwards"));
18607 else if (sibling_ptr > reader->buffer_end)
18608 dwarf2_section_buffer_overflow_complaint (reader->die_section);
18610 part_die->sibling = sibling_ptr;
18613 case DW_AT_byte_size:
18614 part_die->has_byte_size = 1;
18616 case DW_AT_const_value:
18617 part_die->has_const_value = 1;
18619 case DW_AT_calling_convention:
18620 /* DWARF doesn't provide a way to identify a program's source-level
18621 entry point. DW_AT_calling_convention attributes are only meant
18622 to describe functions' calling conventions.
18624 However, because it's a necessary piece of information in
18625 Fortran, and before DWARF 4 DW_CC_program was the only
18626 piece of debugging information whose definition refers to
18627 a 'main program' at all, several compilers marked Fortran
18628 main programs with DW_CC_program --- even when those
18629 functions use the standard calling conventions.
18631 Although DWARF now specifies a way to provide this
18632 information, we support this practice for backward
18634 if (DW_UNSND (&attr) == DW_CC_program
18635 && cu->language == language_fortran)
18636 part_die->main_subprogram = 1;
18639 if (DW_UNSND (&attr) == DW_INL_inlined
18640 || DW_UNSND (&attr) == DW_INL_declared_inlined)
18641 part_die->may_be_inlined = 1;
18645 if (part_die->tag == DW_TAG_imported_unit)
18647 part_die->d.sect_off = dwarf2_get_ref_die_offset (&attr);
18648 part_die->is_dwz = (attr.form == DW_FORM_GNU_ref_alt
18649 || cu->per_cu->is_dwz);
18653 case DW_AT_main_subprogram:
18654 part_die->main_subprogram = DW_UNSND (&attr);
18662 if (high_pc_relative)
18663 part_die->highpc += part_die->lowpc;
18665 if (has_low_pc_attr && has_high_pc_attr)
18667 /* When using the GNU linker, .gnu.linkonce. sections are used to
18668 eliminate duplicate copies of functions and vtables and such.
18669 The linker will arbitrarily choose one and discard the others.
18670 The AT_*_pc values for such functions refer to local labels in
18671 these sections. If the section from that file was discarded, the
18672 labels are not in the output, so the relocs get a value of 0.
18673 If this is a discarded function, mark the pc bounds as invalid,
18674 so that GDB will ignore it. */
18675 if (part_die->lowpc == 0 && !dwarf2_per_objfile->has_section_at_zero)
18677 struct gdbarch *gdbarch = get_objfile_arch (objfile);
18679 complaint (&symfile_complaints,
18680 _("DW_AT_low_pc %s is zero "
18681 "for DIE at %s [in module %s]"),
18682 paddress (gdbarch, part_die->lowpc),
18683 sect_offset_str (part_die->sect_off),
18684 objfile_name (objfile));
18686 /* dwarf2_get_pc_bounds has also the strict low < high requirement. */
18687 else if (part_die->lowpc >= part_die->highpc)
18689 struct gdbarch *gdbarch = get_objfile_arch (objfile);
18691 complaint (&symfile_complaints,
18692 _("DW_AT_low_pc %s is not < DW_AT_high_pc %s "
18693 "for DIE at %s [in module %s]"),
18694 paddress (gdbarch, part_die->lowpc),
18695 paddress (gdbarch, part_die->highpc),
18696 sect_offset_str (part_die->sect_off),
18697 objfile_name (objfile));
18700 part_die->has_pc_info = 1;
18706 /* Find a cached partial DIE at OFFSET in CU. */
18708 static struct partial_die_info *
18709 find_partial_die_in_comp_unit (sect_offset sect_off, struct dwarf2_cu *cu)
18711 struct partial_die_info *lookup_die = NULL;
18712 struct partial_die_info part_die;
18714 part_die.sect_off = sect_off;
18715 lookup_die = ((struct partial_die_info *)
18716 htab_find_with_hash (cu->partial_dies, &part_die,
18717 to_underlying (sect_off)));
18722 /* Find a partial DIE at OFFSET, which may or may not be in CU,
18723 except in the case of .debug_types DIEs which do not reference
18724 outside their CU (they do however referencing other types via
18725 DW_FORM_ref_sig8). */
18727 static struct partial_die_info *
18728 find_partial_die (sect_offset sect_off, int offset_in_dwz, struct dwarf2_cu *cu)
18730 struct dwarf2_per_objfile *dwarf2_per_objfile
18731 = cu->per_cu->dwarf2_per_objfile;
18732 struct objfile *objfile = dwarf2_per_objfile->objfile;
18733 struct dwarf2_per_cu_data *per_cu = NULL;
18734 struct partial_die_info *pd = NULL;
18736 if (offset_in_dwz == cu->per_cu->is_dwz
18737 && offset_in_cu_p (&cu->header, sect_off))
18739 pd = find_partial_die_in_comp_unit (sect_off, cu);
18742 /* We missed recording what we needed.
18743 Load all dies and try again. */
18744 per_cu = cu->per_cu;
18748 /* TUs don't reference other CUs/TUs (except via type signatures). */
18749 if (cu->per_cu->is_debug_types)
18751 error (_("Dwarf Error: Type Unit at offset %s contains"
18752 " external reference to offset %s [in module %s].\n"),
18753 sect_offset_str (cu->header.sect_off), sect_offset_str (sect_off),
18754 bfd_get_filename (objfile->obfd));
18756 per_cu = dwarf2_find_containing_comp_unit (sect_off, offset_in_dwz,
18757 dwarf2_per_objfile);
18759 if (per_cu->cu == NULL || per_cu->cu->partial_dies == NULL)
18760 load_partial_comp_unit (per_cu);
18762 per_cu->cu->last_used = 0;
18763 pd = find_partial_die_in_comp_unit (sect_off, per_cu->cu);
18766 /* If we didn't find it, and not all dies have been loaded,
18767 load them all and try again. */
18769 if (pd == NULL && per_cu->load_all_dies == 0)
18771 per_cu->load_all_dies = 1;
18773 /* This is nasty. When we reread the DIEs, somewhere up the call chain
18774 THIS_CU->cu may already be in use. So we can't just free it and
18775 replace its DIEs with the ones we read in. Instead, we leave those
18776 DIEs alone (which can still be in use, e.g. in scan_partial_symbols),
18777 and clobber THIS_CU->cu->partial_dies with the hash table for the new
18779 load_partial_comp_unit (per_cu);
18781 pd = find_partial_die_in_comp_unit (sect_off, per_cu->cu);
18785 internal_error (__FILE__, __LINE__,
18786 _("could not find partial DIE %s "
18787 "in cache [from module %s]\n"),
18788 sect_offset_str (sect_off), bfd_get_filename (objfile->obfd));
18792 /* See if we can figure out if the class lives in a namespace. We do
18793 this by looking for a member function; its demangled name will
18794 contain namespace info, if there is any. */
18797 guess_partial_die_structure_name (struct partial_die_info *struct_pdi,
18798 struct dwarf2_cu *cu)
18800 /* NOTE: carlton/2003-10-07: Getting the info this way changes
18801 what template types look like, because the demangler
18802 frequently doesn't give the same name as the debug info. We
18803 could fix this by only using the demangled name to get the
18804 prefix (but see comment in read_structure_type). */
18806 struct partial_die_info *real_pdi;
18807 struct partial_die_info *child_pdi;
18809 /* If this DIE (this DIE's specification, if any) has a parent, then
18810 we should not do this. We'll prepend the parent's fully qualified
18811 name when we create the partial symbol. */
18813 real_pdi = struct_pdi;
18814 while (real_pdi->has_specification)
18815 real_pdi = find_partial_die (real_pdi->spec_offset,
18816 real_pdi->spec_is_dwz, cu);
18818 if (real_pdi->die_parent != NULL)
18821 for (child_pdi = struct_pdi->die_child;
18823 child_pdi = child_pdi->die_sibling)
18825 if (child_pdi->tag == DW_TAG_subprogram
18826 && child_pdi->linkage_name != NULL)
18828 char *actual_class_name
18829 = language_class_name_from_physname (cu->language_defn,
18830 child_pdi->linkage_name);
18831 if (actual_class_name != NULL)
18833 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
18836 obstack_copy0 (&objfile->per_bfd->storage_obstack,
18838 strlen (actual_class_name)));
18839 xfree (actual_class_name);
18846 /* Adjust PART_DIE before generating a symbol for it. This function
18847 may set the is_external flag or change the DIE's name. */
18850 fixup_partial_die (struct partial_die_info *part_die,
18851 struct dwarf2_cu *cu)
18853 /* Once we've fixed up a die, there's no point in doing so again.
18854 This also avoids a memory leak if we were to call
18855 guess_partial_die_structure_name multiple times. */
18856 if (part_die->fixup_called)
18859 /* If we found a reference attribute and the DIE has no name, try
18860 to find a name in the referred to DIE. */
18862 if (part_die->name == NULL && part_die->has_specification)
18864 struct partial_die_info *spec_die;
18866 spec_die = find_partial_die (part_die->spec_offset,
18867 part_die->spec_is_dwz, cu);
18869 fixup_partial_die (spec_die, cu);
18871 if (spec_die->name)
18873 part_die->name = spec_die->name;
18875 /* Copy DW_AT_external attribute if it is set. */
18876 if (spec_die->is_external)
18877 part_die->is_external = spec_die->is_external;
18881 /* Set default names for some unnamed DIEs. */
18883 if (part_die->name == NULL && part_die->tag == DW_TAG_namespace)
18884 part_die->name = CP_ANONYMOUS_NAMESPACE_STR;
18886 /* If there is no parent die to provide a namespace, and there are
18887 children, see if we can determine the namespace from their linkage
18889 if (cu->language == language_cplus
18890 && !VEC_empty (dwarf2_section_info_def,
18891 cu->per_cu->dwarf2_per_objfile->types)
18892 && part_die->die_parent == NULL
18893 && part_die->has_children
18894 && (part_die->tag == DW_TAG_class_type
18895 || part_die->tag == DW_TAG_structure_type
18896 || part_die->tag == DW_TAG_union_type))
18897 guess_partial_die_structure_name (part_die, cu);
18899 /* GCC might emit a nameless struct or union that has a linkage
18900 name. See http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47510. */
18901 if (part_die->name == NULL
18902 && (part_die->tag == DW_TAG_class_type
18903 || part_die->tag == DW_TAG_interface_type
18904 || part_die->tag == DW_TAG_structure_type
18905 || part_die->tag == DW_TAG_union_type)
18906 && part_die->linkage_name != NULL)
18910 demangled = gdb_demangle (part_die->linkage_name, DMGL_TYPES);
18915 /* Strip any leading namespaces/classes, keep only the base name.
18916 DW_AT_name for named DIEs does not contain the prefixes. */
18917 base = strrchr (demangled, ':');
18918 if (base && base > demangled && base[-1] == ':')
18923 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
18926 obstack_copy0 (&objfile->per_bfd->storage_obstack,
18927 base, strlen (base)));
18932 part_die->fixup_called = 1;
18935 /* Read an attribute value described by an attribute form. */
18937 static const gdb_byte *
18938 read_attribute_value (const struct die_reader_specs *reader,
18939 struct attribute *attr, unsigned form,
18940 LONGEST implicit_const, const gdb_byte *info_ptr)
18942 struct dwarf2_cu *cu = reader->cu;
18943 struct dwarf2_per_objfile *dwarf2_per_objfile
18944 = cu->per_cu->dwarf2_per_objfile;
18945 struct objfile *objfile = dwarf2_per_objfile->objfile;
18946 struct gdbarch *gdbarch = get_objfile_arch (objfile);
18947 bfd *abfd = reader->abfd;
18948 struct comp_unit_head *cu_header = &cu->header;
18949 unsigned int bytes_read;
18950 struct dwarf_block *blk;
18952 attr->form = (enum dwarf_form) form;
18955 case DW_FORM_ref_addr:
18956 if (cu->header.version == 2)
18957 DW_UNSND (attr) = read_address (abfd, info_ptr, cu, &bytes_read);
18959 DW_UNSND (attr) = read_offset (abfd, info_ptr,
18960 &cu->header, &bytes_read);
18961 info_ptr += bytes_read;
18963 case DW_FORM_GNU_ref_alt:
18964 DW_UNSND (attr) = read_offset (abfd, info_ptr, &cu->header, &bytes_read);
18965 info_ptr += bytes_read;
18968 DW_ADDR (attr) = read_address (abfd, info_ptr, cu, &bytes_read);
18969 DW_ADDR (attr) = gdbarch_adjust_dwarf2_addr (gdbarch, DW_ADDR (attr));
18970 info_ptr += bytes_read;
18972 case DW_FORM_block2:
18973 blk = dwarf_alloc_block (cu);
18974 blk->size = read_2_bytes (abfd, info_ptr);
18976 blk->data = read_n_bytes (abfd, info_ptr, blk->size);
18977 info_ptr += blk->size;
18978 DW_BLOCK (attr) = blk;
18980 case DW_FORM_block4:
18981 blk = dwarf_alloc_block (cu);
18982 blk->size = read_4_bytes (abfd, info_ptr);
18984 blk->data = read_n_bytes (abfd, info_ptr, blk->size);
18985 info_ptr += blk->size;
18986 DW_BLOCK (attr) = blk;
18988 case DW_FORM_data2:
18989 DW_UNSND (attr) = read_2_bytes (abfd, info_ptr);
18992 case DW_FORM_data4:
18993 DW_UNSND (attr) = read_4_bytes (abfd, info_ptr);
18996 case DW_FORM_data8:
18997 DW_UNSND (attr) = read_8_bytes (abfd, info_ptr);
19000 case DW_FORM_data16:
19001 blk = dwarf_alloc_block (cu);
19003 blk->data = read_n_bytes (abfd, info_ptr, 16);
19005 DW_BLOCK (attr) = blk;
19007 case DW_FORM_sec_offset:
19008 DW_UNSND (attr) = read_offset (abfd, info_ptr, &cu->header, &bytes_read);
19009 info_ptr += bytes_read;
19011 case DW_FORM_string:
19012 DW_STRING (attr) = read_direct_string (abfd, info_ptr, &bytes_read);
19013 DW_STRING_IS_CANONICAL (attr) = 0;
19014 info_ptr += bytes_read;
19017 if (!cu->per_cu->is_dwz)
19019 DW_STRING (attr) = read_indirect_string (dwarf2_per_objfile,
19020 abfd, info_ptr, cu_header,
19022 DW_STRING_IS_CANONICAL (attr) = 0;
19023 info_ptr += bytes_read;
19027 case DW_FORM_line_strp:
19028 if (!cu->per_cu->is_dwz)
19030 DW_STRING (attr) = read_indirect_line_string (dwarf2_per_objfile,
19032 cu_header, &bytes_read);
19033 DW_STRING_IS_CANONICAL (attr) = 0;
19034 info_ptr += bytes_read;
19038 case DW_FORM_GNU_strp_alt:
19040 struct dwz_file *dwz = dwarf2_get_dwz_file (dwarf2_per_objfile);
19041 LONGEST str_offset = read_offset (abfd, info_ptr, cu_header,
19044 DW_STRING (attr) = read_indirect_string_from_dwz (objfile,
19046 DW_STRING_IS_CANONICAL (attr) = 0;
19047 info_ptr += bytes_read;
19050 case DW_FORM_exprloc:
19051 case DW_FORM_block:
19052 blk = dwarf_alloc_block (cu);
19053 blk->size = read_unsigned_leb128 (abfd, info_ptr, &bytes_read);
19054 info_ptr += bytes_read;
19055 blk->data = read_n_bytes (abfd, info_ptr, blk->size);
19056 info_ptr += blk->size;
19057 DW_BLOCK (attr) = blk;
19059 case DW_FORM_block1:
19060 blk = dwarf_alloc_block (cu);
19061 blk->size = read_1_byte (abfd, info_ptr);
19063 blk->data = read_n_bytes (abfd, info_ptr, blk->size);
19064 info_ptr += blk->size;
19065 DW_BLOCK (attr) = blk;
19067 case DW_FORM_data1:
19068 DW_UNSND (attr) = read_1_byte (abfd, info_ptr);
19072 DW_UNSND (attr) = read_1_byte (abfd, info_ptr);
19075 case DW_FORM_flag_present:
19076 DW_UNSND (attr) = 1;
19078 case DW_FORM_sdata:
19079 DW_SND (attr) = read_signed_leb128 (abfd, info_ptr, &bytes_read);
19080 info_ptr += bytes_read;
19082 case DW_FORM_udata:
19083 DW_UNSND (attr) = read_unsigned_leb128 (abfd, info_ptr, &bytes_read);
19084 info_ptr += bytes_read;
19087 DW_UNSND (attr) = (to_underlying (cu->header.sect_off)
19088 + read_1_byte (abfd, info_ptr));
19092 DW_UNSND (attr) = (to_underlying (cu->header.sect_off)
19093 + read_2_bytes (abfd, info_ptr));
19097 DW_UNSND (attr) = (to_underlying (cu->header.sect_off)
19098 + read_4_bytes (abfd, info_ptr));
19102 DW_UNSND (attr) = (to_underlying (cu->header.sect_off)
19103 + read_8_bytes (abfd, info_ptr));
19106 case DW_FORM_ref_sig8:
19107 DW_SIGNATURE (attr) = read_8_bytes (abfd, info_ptr);
19110 case DW_FORM_ref_udata:
19111 DW_UNSND (attr) = (to_underlying (cu->header.sect_off)
19112 + read_unsigned_leb128 (abfd, info_ptr, &bytes_read));
19113 info_ptr += bytes_read;
19115 case DW_FORM_indirect:
19116 form = read_unsigned_leb128 (abfd, info_ptr, &bytes_read);
19117 info_ptr += bytes_read;
19118 if (form == DW_FORM_implicit_const)
19120 implicit_const = read_signed_leb128 (abfd, info_ptr, &bytes_read);
19121 info_ptr += bytes_read;
19123 info_ptr = read_attribute_value (reader, attr, form, implicit_const,
19126 case DW_FORM_implicit_const:
19127 DW_SND (attr) = implicit_const;
19129 case DW_FORM_GNU_addr_index:
19130 if (reader->dwo_file == NULL)
19132 /* For now flag a hard error.
19133 Later we can turn this into a complaint. */
19134 error (_("Dwarf Error: %s found in non-DWO CU [in module %s]"),
19135 dwarf_form_name (form),
19136 bfd_get_filename (abfd));
19138 DW_ADDR (attr) = read_addr_index_from_leb128 (cu, info_ptr, &bytes_read);
19139 info_ptr += bytes_read;
19141 case DW_FORM_GNU_str_index:
19142 if (reader->dwo_file == NULL)
19144 /* For now flag a hard error.
19145 Later we can turn this into a complaint if warranted. */
19146 error (_("Dwarf Error: %s found in non-DWO CU [in module %s]"),
19147 dwarf_form_name (form),
19148 bfd_get_filename (abfd));
19151 ULONGEST str_index =
19152 read_unsigned_leb128 (abfd, info_ptr, &bytes_read);
19154 DW_STRING (attr) = read_str_index (reader, str_index);
19155 DW_STRING_IS_CANONICAL (attr) = 0;
19156 info_ptr += bytes_read;
19160 error (_("Dwarf Error: Cannot handle %s in DWARF reader [in module %s]"),
19161 dwarf_form_name (form),
19162 bfd_get_filename (abfd));
19166 if (cu->per_cu->is_dwz && attr_form_is_ref (attr))
19167 attr->form = DW_FORM_GNU_ref_alt;
19169 /* We have seen instances where the compiler tried to emit a byte
19170 size attribute of -1 which ended up being encoded as an unsigned
19171 0xffffffff. Although 0xffffffff is technically a valid size value,
19172 an object of this size seems pretty unlikely so we can relatively
19173 safely treat these cases as if the size attribute was invalid and
19174 treat them as zero by default. */
19175 if (attr->name == DW_AT_byte_size
19176 && form == DW_FORM_data4
19177 && DW_UNSND (attr) >= 0xffffffff)
19180 (&symfile_complaints,
19181 _("Suspicious DW_AT_byte_size value treated as zero instead of %s"),
19182 hex_string (DW_UNSND (attr)));
19183 DW_UNSND (attr) = 0;
19189 /* Read an attribute described by an abbreviated attribute. */
19191 static const gdb_byte *
19192 read_attribute (const struct die_reader_specs *reader,
19193 struct attribute *attr, struct attr_abbrev *abbrev,
19194 const gdb_byte *info_ptr)
19196 attr->name = abbrev->name;
19197 return read_attribute_value (reader, attr, abbrev->form,
19198 abbrev->implicit_const, info_ptr);
19201 /* Read dwarf information from a buffer. */
19203 static unsigned int
19204 read_1_byte (bfd *abfd, const gdb_byte *buf)
19206 return bfd_get_8 (abfd, buf);
19210 read_1_signed_byte (bfd *abfd, const gdb_byte *buf)
19212 return bfd_get_signed_8 (abfd, buf);
19215 static unsigned int
19216 read_2_bytes (bfd *abfd, const gdb_byte *buf)
19218 return bfd_get_16 (abfd, buf);
19222 read_2_signed_bytes (bfd *abfd, const gdb_byte *buf)
19224 return bfd_get_signed_16 (abfd, buf);
19227 static unsigned int
19228 read_4_bytes (bfd *abfd, const gdb_byte *buf)
19230 return bfd_get_32 (abfd, buf);
19234 read_4_signed_bytes (bfd *abfd, const gdb_byte *buf)
19236 return bfd_get_signed_32 (abfd, buf);
19240 read_8_bytes (bfd *abfd, const gdb_byte *buf)
19242 return bfd_get_64 (abfd, buf);
19246 read_address (bfd *abfd, const gdb_byte *buf, struct dwarf2_cu *cu,
19247 unsigned int *bytes_read)
19249 struct comp_unit_head *cu_header = &cu->header;
19250 CORE_ADDR retval = 0;
19252 if (cu_header->signed_addr_p)
19254 switch (cu_header->addr_size)
19257 retval = bfd_get_signed_16 (abfd, buf);
19260 retval = bfd_get_signed_32 (abfd, buf);
19263 retval = bfd_get_signed_64 (abfd, buf);
19266 internal_error (__FILE__, __LINE__,
19267 _("read_address: bad switch, signed [in module %s]"),
19268 bfd_get_filename (abfd));
19273 switch (cu_header->addr_size)
19276 retval = bfd_get_16 (abfd, buf);
19279 retval = bfd_get_32 (abfd, buf);
19282 retval = bfd_get_64 (abfd, buf);
19285 internal_error (__FILE__, __LINE__,
19286 _("read_address: bad switch, "
19287 "unsigned [in module %s]"),
19288 bfd_get_filename (abfd));
19292 *bytes_read = cu_header->addr_size;
19296 /* Read the initial length from a section. The (draft) DWARF 3
19297 specification allows the initial length to take up either 4 bytes
19298 or 12 bytes. If the first 4 bytes are 0xffffffff, then the next 8
19299 bytes describe the length and all offsets will be 8 bytes in length
19302 An older, non-standard 64-bit format is also handled by this
19303 function. The older format in question stores the initial length
19304 as an 8-byte quantity without an escape value. Lengths greater
19305 than 2^32 aren't very common which means that the initial 4 bytes
19306 is almost always zero. Since a length value of zero doesn't make
19307 sense for the 32-bit format, this initial zero can be considered to
19308 be an escape value which indicates the presence of the older 64-bit
19309 format. As written, the code can't detect (old format) lengths
19310 greater than 4GB. If it becomes necessary to handle lengths
19311 somewhat larger than 4GB, we could allow other small values (such
19312 as the non-sensical values of 1, 2, and 3) to also be used as
19313 escape values indicating the presence of the old format.
19315 The value returned via bytes_read should be used to increment the
19316 relevant pointer after calling read_initial_length().
19318 [ Note: read_initial_length() and read_offset() are based on the
19319 document entitled "DWARF Debugging Information Format", revision
19320 3, draft 8, dated November 19, 2001. This document was obtained
19323 http://reality.sgiweb.org/davea/dwarf3-draft8-011125.pdf
19325 This document is only a draft and is subject to change. (So beware.)
19327 Details regarding the older, non-standard 64-bit format were
19328 determined empirically by examining 64-bit ELF files produced by
19329 the SGI toolchain on an IRIX 6.5 machine.
19331 - Kevin, July 16, 2002
19335 read_initial_length (bfd *abfd, const gdb_byte *buf, unsigned int *bytes_read)
19337 LONGEST length = bfd_get_32 (abfd, buf);
19339 if (length == 0xffffffff)
19341 length = bfd_get_64 (abfd, buf + 4);
19344 else if (length == 0)
19346 /* Handle the (non-standard) 64-bit DWARF2 format used by IRIX. */
19347 length = bfd_get_64 (abfd, buf);
19358 /* Cover function for read_initial_length.
19359 Returns the length of the object at BUF, and stores the size of the
19360 initial length in *BYTES_READ and stores the size that offsets will be in
19362 If the initial length size is not equivalent to that specified in
19363 CU_HEADER then issue a complaint.
19364 This is useful when reading non-comp-unit headers. */
19367 read_checked_initial_length_and_offset (bfd *abfd, const gdb_byte *buf,
19368 const struct comp_unit_head *cu_header,
19369 unsigned int *bytes_read,
19370 unsigned int *offset_size)
19372 LONGEST length = read_initial_length (abfd, buf, bytes_read);
19374 gdb_assert (cu_header->initial_length_size == 4
19375 || cu_header->initial_length_size == 8
19376 || cu_header->initial_length_size == 12);
19378 if (cu_header->initial_length_size != *bytes_read)
19379 complaint (&symfile_complaints,
19380 _("intermixed 32-bit and 64-bit DWARF sections"));
19382 *offset_size = (*bytes_read == 4) ? 4 : 8;
19386 /* Read an offset from the data stream. The size of the offset is
19387 given by cu_header->offset_size. */
19390 read_offset (bfd *abfd, const gdb_byte *buf,
19391 const struct comp_unit_head *cu_header,
19392 unsigned int *bytes_read)
19394 LONGEST offset = read_offset_1 (abfd, buf, cu_header->offset_size);
19396 *bytes_read = cu_header->offset_size;
19400 /* Read an offset from the data stream. */
19403 read_offset_1 (bfd *abfd, const gdb_byte *buf, unsigned int offset_size)
19405 LONGEST retval = 0;
19407 switch (offset_size)
19410 retval = bfd_get_32 (abfd, buf);
19413 retval = bfd_get_64 (abfd, buf);
19416 internal_error (__FILE__, __LINE__,
19417 _("read_offset_1: bad switch [in module %s]"),
19418 bfd_get_filename (abfd));
19424 static const gdb_byte *
19425 read_n_bytes (bfd *abfd, const gdb_byte *buf, unsigned int size)
19427 /* If the size of a host char is 8 bits, we can return a pointer
19428 to the buffer, otherwise we have to copy the data to a buffer
19429 allocated on the temporary obstack. */
19430 gdb_assert (HOST_CHAR_BIT == 8);
19434 static const char *
19435 read_direct_string (bfd *abfd, const gdb_byte *buf,
19436 unsigned int *bytes_read_ptr)
19438 /* If the size of a host char is 8 bits, we can return a pointer
19439 to the string, otherwise we have to copy the string to a buffer
19440 allocated on the temporary obstack. */
19441 gdb_assert (HOST_CHAR_BIT == 8);
19444 *bytes_read_ptr = 1;
19447 *bytes_read_ptr = strlen ((const char *) buf) + 1;
19448 return (const char *) buf;
19451 /* Return pointer to string at section SECT offset STR_OFFSET with error
19452 reporting strings FORM_NAME and SECT_NAME. */
19454 static const char *
19455 read_indirect_string_at_offset_from (struct objfile *objfile,
19456 bfd *abfd, LONGEST str_offset,
19457 struct dwarf2_section_info *sect,
19458 const char *form_name,
19459 const char *sect_name)
19461 dwarf2_read_section (objfile, sect);
19462 if (sect->buffer == NULL)
19463 error (_("%s used without %s section [in module %s]"),
19464 form_name, sect_name, bfd_get_filename (abfd));
19465 if (str_offset >= sect->size)
19466 error (_("%s pointing outside of %s section [in module %s]"),
19467 form_name, sect_name, bfd_get_filename (abfd));
19468 gdb_assert (HOST_CHAR_BIT == 8);
19469 if (sect->buffer[str_offset] == '\0')
19471 return (const char *) (sect->buffer + str_offset);
19474 /* Return pointer to string at .debug_str offset STR_OFFSET. */
19476 static const char *
19477 read_indirect_string_at_offset (struct dwarf2_per_objfile *dwarf2_per_objfile,
19478 bfd *abfd, LONGEST str_offset)
19480 return read_indirect_string_at_offset_from (dwarf2_per_objfile->objfile,
19482 &dwarf2_per_objfile->str,
19483 "DW_FORM_strp", ".debug_str");
19486 /* Return pointer to string at .debug_line_str offset STR_OFFSET. */
19488 static const char *
19489 read_indirect_line_string_at_offset (struct dwarf2_per_objfile *dwarf2_per_objfile,
19490 bfd *abfd, LONGEST str_offset)
19492 return read_indirect_string_at_offset_from (dwarf2_per_objfile->objfile,
19494 &dwarf2_per_objfile->line_str,
19495 "DW_FORM_line_strp",
19496 ".debug_line_str");
19499 /* Read a string at offset STR_OFFSET in the .debug_str section from
19500 the .dwz file DWZ. Throw an error if the offset is too large. If
19501 the string consists of a single NUL byte, return NULL; otherwise
19502 return a pointer to the string. */
19504 static const char *
19505 read_indirect_string_from_dwz (struct objfile *objfile, struct dwz_file *dwz,
19506 LONGEST str_offset)
19508 dwarf2_read_section (objfile, &dwz->str);
19510 if (dwz->str.buffer == NULL)
19511 error (_("DW_FORM_GNU_strp_alt used without .debug_str "
19512 "section [in module %s]"),
19513 bfd_get_filename (dwz->dwz_bfd));
19514 if (str_offset >= dwz->str.size)
19515 error (_("DW_FORM_GNU_strp_alt pointing outside of "
19516 ".debug_str section [in module %s]"),
19517 bfd_get_filename (dwz->dwz_bfd));
19518 gdb_assert (HOST_CHAR_BIT == 8);
19519 if (dwz->str.buffer[str_offset] == '\0')
19521 return (const char *) (dwz->str.buffer + str_offset);
19524 /* Return pointer to string at .debug_str offset as read from BUF.
19525 BUF is assumed to be in a compilation unit described by CU_HEADER.
19526 Return *BYTES_READ_PTR count of bytes read from BUF. */
19528 static const char *
19529 read_indirect_string (struct dwarf2_per_objfile *dwarf2_per_objfile, bfd *abfd,
19530 const gdb_byte *buf,
19531 const struct comp_unit_head *cu_header,
19532 unsigned int *bytes_read_ptr)
19534 LONGEST str_offset = read_offset (abfd, buf, cu_header, bytes_read_ptr);
19536 return read_indirect_string_at_offset (dwarf2_per_objfile, abfd, str_offset);
19539 /* Return pointer to string at .debug_line_str offset as read from BUF.
19540 BUF is assumed to be in a compilation unit described by CU_HEADER.
19541 Return *BYTES_READ_PTR count of bytes read from BUF. */
19543 static const char *
19544 read_indirect_line_string (struct dwarf2_per_objfile *dwarf2_per_objfile,
19545 bfd *abfd, const gdb_byte *buf,
19546 const struct comp_unit_head *cu_header,
19547 unsigned int *bytes_read_ptr)
19549 LONGEST str_offset = read_offset (abfd, buf, cu_header, bytes_read_ptr);
19551 return read_indirect_line_string_at_offset (dwarf2_per_objfile, abfd,
19556 read_unsigned_leb128 (bfd *abfd, const gdb_byte *buf,
19557 unsigned int *bytes_read_ptr)
19560 unsigned int num_read;
19562 unsigned char byte;
19569 byte = bfd_get_8 (abfd, buf);
19572 result |= ((ULONGEST) (byte & 127) << shift);
19573 if ((byte & 128) == 0)
19579 *bytes_read_ptr = num_read;
19584 read_signed_leb128 (bfd *abfd, const gdb_byte *buf,
19585 unsigned int *bytes_read_ptr)
19588 int shift, num_read;
19589 unsigned char byte;
19596 byte = bfd_get_8 (abfd, buf);
19599 result |= ((LONGEST) (byte & 127) << shift);
19601 if ((byte & 128) == 0)
19606 if ((shift < 8 * sizeof (result)) && (byte & 0x40))
19607 result |= -(((LONGEST) 1) << shift);
19608 *bytes_read_ptr = num_read;
19612 /* Given index ADDR_INDEX in .debug_addr, fetch the value.
19613 ADDR_BASE is the DW_AT_GNU_addr_base attribute or zero.
19614 ADDR_SIZE is the size of addresses from the CU header. */
19617 read_addr_index_1 (struct dwarf2_per_objfile *dwarf2_per_objfile,
19618 unsigned int addr_index, ULONGEST addr_base, int addr_size)
19620 struct objfile *objfile = dwarf2_per_objfile->objfile;
19621 bfd *abfd = objfile->obfd;
19622 const gdb_byte *info_ptr;
19624 dwarf2_read_section (objfile, &dwarf2_per_objfile->addr);
19625 if (dwarf2_per_objfile->addr.buffer == NULL)
19626 error (_("DW_FORM_addr_index used without .debug_addr section [in module %s]"),
19627 objfile_name (objfile));
19628 if (addr_base + addr_index * addr_size >= dwarf2_per_objfile->addr.size)
19629 error (_("DW_FORM_addr_index pointing outside of "
19630 ".debug_addr section [in module %s]"),
19631 objfile_name (objfile));
19632 info_ptr = (dwarf2_per_objfile->addr.buffer
19633 + addr_base + addr_index * addr_size);
19634 if (addr_size == 4)
19635 return bfd_get_32 (abfd, info_ptr);
19637 return bfd_get_64 (abfd, info_ptr);
19640 /* Given index ADDR_INDEX in .debug_addr, fetch the value. */
19643 read_addr_index (struct dwarf2_cu *cu, unsigned int addr_index)
19645 return read_addr_index_1 (cu->per_cu->dwarf2_per_objfile, addr_index,
19646 cu->addr_base, cu->header.addr_size);
19649 /* Given a pointer to an leb128 value, fetch the value from .debug_addr. */
19652 read_addr_index_from_leb128 (struct dwarf2_cu *cu, const gdb_byte *info_ptr,
19653 unsigned int *bytes_read)
19655 bfd *abfd = cu->per_cu->dwarf2_per_objfile->objfile->obfd;
19656 unsigned int addr_index = read_unsigned_leb128 (abfd, info_ptr, bytes_read);
19658 return read_addr_index (cu, addr_index);
19661 /* Data structure to pass results from dwarf2_read_addr_index_reader
19662 back to dwarf2_read_addr_index. */
19664 struct dwarf2_read_addr_index_data
19666 ULONGEST addr_base;
19670 /* die_reader_func for dwarf2_read_addr_index. */
19673 dwarf2_read_addr_index_reader (const struct die_reader_specs *reader,
19674 const gdb_byte *info_ptr,
19675 struct die_info *comp_unit_die,
19679 struct dwarf2_cu *cu = reader->cu;
19680 struct dwarf2_read_addr_index_data *aidata =
19681 (struct dwarf2_read_addr_index_data *) data;
19683 aidata->addr_base = cu->addr_base;
19684 aidata->addr_size = cu->header.addr_size;
19687 /* Given an index in .debug_addr, fetch the value.
19688 NOTE: This can be called during dwarf expression evaluation,
19689 long after the debug information has been read, and thus per_cu->cu
19690 may no longer exist. */
19693 dwarf2_read_addr_index (struct dwarf2_per_cu_data *per_cu,
19694 unsigned int addr_index)
19696 struct dwarf2_per_objfile *dwarf2_per_objfile = per_cu->dwarf2_per_objfile;
19697 struct objfile *objfile = dwarf2_per_objfile->objfile;
19698 struct dwarf2_cu *cu = per_cu->cu;
19699 ULONGEST addr_base;
19702 /* We need addr_base and addr_size.
19703 If we don't have PER_CU->cu, we have to get it.
19704 Nasty, but the alternative is storing the needed info in PER_CU,
19705 which at this point doesn't seem justified: it's not clear how frequently
19706 it would get used and it would increase the size of every PER_CU.
19707 Entry points like dwarf2_per_cu_addr_size do a similar thing
19708 so we're not in uncharted territory here.
19709 Alas we need to be a bit more complicated as addr_base is contained
19712 We don't need to read the entire CU(/TU).
19713 We just need the header and top level die.
19715 IWBN to use the aging mechanism to let us lazily later discard the CU.
19716 For now we skip this optimization. */
19720 addr_base = cu->addr_base;
19721 addr_size = cu->header.addr_size;
19725 struct dwarf2_read_addr_index_data aidata;
19727 /* Note: We can't use init_cutu_and_read_dies_simple here,
19728 we need addr_base. */
19729 init_cutu_and_read_dies (per_cu, NULL, 0, 0,
19730 dwarf2_read_addr_index_reader, &aidata);
19731 addr_base = aidata.addr_base;
19732 addr_size = aidata.addr_size;
19735 return read_addr_index_1 (dwarf2_per_objfile, addr_index, addr_base,
19739 /* Given a DW_FORM_GNU_str_index, fetch the string.
19740 This is only used by the Fission support. */
19742 static const char *
19743 read_str_index (const struct die_reader_specs *reader, ULONGEST str_index)
19745 struct dwarf2_cu *cu = reader->cu;
19746 struct dwarf2_per_objfile *dwarf2_per_objfile
19747 = cu->per_cu->dwarf2_per_objfile;
19748 struct objfile *objfile = dwarf2_per_objfile->objfile;
19749 const char *objf_name = objfile_name (objfile);
19750 bfd *abfd = objfile->obfd;
19751 struct dwarf2_section_info *str_section = &reader->dwo_file->sections.str;
19752 struct dwarf2_section_info *str_offsets_section =
19753 &reader->dwo_file->sections.str_offsets;
19754 const gdb_byte *info_ptr;
19755 ULONGEST str_offset;
19756 static const char form_name[] = "DW_FORM_GNU_str_index";
19758 dwarf2_read_section (objfile, str_section);
19759 dwarf2_read_section (objfile, str_offsets_section);
19760 if (str_section->buffer == NULL)
19761 error (_("%s used without .debug_str.dwo section"
19762 " in CU at offset %s [in module %s]"),
19763 form_name, sect_offset_str (cu->header.sect_off), objf_name);
19764 if (str_offsets_section->buffer == NULL)
19765 error (_("%s used without .debug_str_offsets.dwo section"
19766 " in CU at offset %s [in module %s]"),
19767 form_name, sect_offset_str (cu->header.sect_off), objf_name);
19768 if (str_index * cu->header.offset_size >= str_offsets_section->size)
19769 error (_("%s pointing outside of .debug_str_offsets.dwo"
19770 " section in CU at offset %s [in module %s]"),
19771 form_name, sect_offset_str (cu->header.sect_off), objf_name);
19772 info_ptr = (str_offsets_section->buffer
19773 + str_index * cu->header.offset_size);
19774 if (cu->header.offset_size == 4)
19775 str_offset = bfd_get_32 (abfd, info_ptr);
19777 str_offset = bfd_get_64 (abfd, info_ptr);
19778 if (str_offset >= str_section->size)
19779 error (_("Offset from %s pointing outside of"
19780 " .debug_str.dwo section in CU at offset %s [in module %s]"),
19781 form_name, sect_offset_str (cu->header.sect_off), objf_name);
19782 return (const char *) (str_section->buffer + str_offset);
19785 /* Return the length of an LEB128 number in BUF. */
19788 leb128_size (const gdb_byte *buf)
19790 const gdb_byte *begin = buf;
19796 if ((byte & 128) == 0)
19797 return buf - begin;
19802 set_cu_language (unsigned int lang, struct dwarf2_cu *cu)
19811 cu->language = language_c;
19814 case DW_LANG_C_plus_plus:
19815 case DW_LANG_C_plus_plus_11:
19816 case DW_LANG_C_plus_plus_14:
19817 cu->language = language_cplus;
19820 cu->language = language_d;
19822 case DW_LANG_Fortran77:
19823 case DW_LANG_Fortran90:
19824 case DW_LANG_Fortran95:
19825 case DW_LANG_Fortran03:
19826 case DW_LANG_Fortran08:
19827 cu->language = language_fortran;
19830 cu->language = language_go;
19832 case DW_LANG_Mips_Assembler:
19833 cu->language = language_asm;
19835 case DW_LANG_Ada83:
19836 case DW_LANG_Ada95:
19837 cu->language = language_ada;
19839 case DW_LANG_Modula2:
19840 cu->language = language_m2;
19842 case DW_LANG_Pascal83:
19843 cu->language = language_pascal;
19846 cu->language = language_objc;
19849 case DW_LANG_Rust_old:
19850 cu->language = language_rust;
19852 case DW_LANG_Cobol74:
19853 case DW_LANG_Cobol85:
19855 cu->language = language_minimal;
19858 cu->language_defn = language_def (cu->language);
19861 /* Return the named attribute or NULL if not there. */
19863 static struct attribute *
19864 dwarf2_attr (struct die_info *die, unsigned int name, struct dwarf2_cu *cu)
19869 struct attribute *spec = NULL;
19871 for (i = 0; i < die->num_attrs; ++i)
19873 if (die->attrs[i].name == name)
19874 return &die->attrs[i];
19875 if (die->attrs[i].name == DW_AT_specification
19876 || die->attrs[i].name == DW_AT_abstract_origin)
19877 spec = &die->attrs[i];
19883 die = follow_die_ref (die, spec, &cu);
19889 /* Return the named attribute or NULL if not there,
19890 but do not follow DW_AT_specification, etc.
19891 This is for use in contexts where we're reading .debug_types dies.
19892 Following DW_AT_specification, DW_AT_abstract_origin will take us
19893 back up the chain, and we want to go down. */
19895 static struct attribute *
19896 dwarf2_attr_no_follow (struct die_info *die, unsigned int name)
19900 for (i = 0; i < die->num_attrs; ++i)
19901 if (die->attrs[i].name == name)
19902 return &die->attrs[i];
19907 /* Return the string associated with a string-typed attribute, or NULL if it
19908 is either not found or is of an incorrect type. */
19910 static const char *
19911 dwarf2_string_attr (struct die_info *die, unsigned int name, struct dwarf2_cu *cu)
19913 struct attribute *attr;
19914 const char *str = NULL;
19916 attr = dwarf2_attr (die, name, cu);
19920 if (attr->form == DW_FORM_strp || attr->form == DW_FORM_line_strp
19921 || attr->form == DW_FORM_string
19922 || attr->form == DW_FORM_GNU_str_index
19923 || attr->form == DW_FORM_GNU_strp_alt)
19924 str = DW_STRING (attr);
19926 complaint (&symfile_complaints,
19927 _("string type expected for attribute %s for "
19928 "DIE at %s in module %s"),
19929 dwarf_attr_name (name), sect_offset_str (die->sect_off),
19930 objfile_name (cu->per_cu->dwarf2_per_objfile->objfile));
19936 /* Return non-zero iff the attribute NAME is defined for the given DIE,
19937 and holds a non-zero value. This function should only be used for
19938 DW_FORM_flag or DW_FORM_flag_present attributes. */
19941 dwarf2_flag_true_p (struct die_info *die, unsigned name, struct dwarf2_cu *cu)
19943 struct attribute *attr = dwarf2_attr (die, name, cu);
19945 return (attr && DW_UNSND (attr));
19949 die_is_declaration (struct die_info *die, struct dwarf2_cu *cu)
19951 /* A DIE is a declaration if it has a DW_AT_declaration attribute
19952 which value is non-zero. However, we have to be careful with
19953 DIEs having a DW_AT_specification attribute, because dwarf2_attr()
19954 (via dwarf2_flag_true_p) follows this attribute. So we may
19955 end up accidently finding a declaration attribute that belongs
19956 to a different DIE referenced by the specification attribute,
19957 even though the given DIE does not have a declaration attribute. */
19958 return (dwarf2_flag_true_p (die, DW_AT_declaration, cu)
19959 && dwarf2_attr (die, DW_AT_specification, cu) == NULL);
19962 /* Return the die giving the specification for DIE, if there is
19963 one. *SPEC_CU is the CU containing DIE on input, and the CU
19964 containing the return value on output. If there is no
19965 specification, but there is an abstract origin, that is
19968 static struct die_info *
19969 die_specification (struct die_info *die, struct dwarf2_cu **spec_cu)
19971 struct attribute *spec_attr = dwarf2_attr (die, DW_AT_specification,
19974 if (spec_attr == NULL)
19975 spec_attr = dwarf2_attr (die, DW_AT_abstract_origin, *spec_cu);
19977 if (spec_attr == NULL)
19980 return follow_die_ref (die, spec_attr, spec_cu);
19983 /* Stub for free_line_header to match void * callback types. */
19986 free_line_header_voidp (void *arg)
19988 struct line_header *lh = (struct line_header *) arg;
19994 line_header::add_include_dir (const char *include_dir)
19996 if (dwarf_line_debug >= 2)
19997 fprintf_unfiltered (gdb_stdlog, "Adding dir %zu: %s\n",
19998 include_dirs.size () + 1, include_dir);
20000 include_dirs.push_back (include_dir);
20004 line_header::add_file_name (const char *name,
20006 unsigned int mod_time,
20007 unsigned int length)
20009 if (dwarf_line_debug >= 2)
20010 fprintf_unfiltered (gdb_stdlog, "Adding file %u: %s\n",
20011 (unsigned) file_names.size () + 1, name);
20013 file_names.emplace_back (name, d_index, mod_time, length);
20016 /* A convenience function to find the proper .debug_line section for a CU. */
20018 static struct dwarf2_section_info *
20019 get_debug_line_section (struct dwarf2_cu *cu)
20021 struct dwarf2_section_info *section;
20022 struct dwarf2_per_objfile *dwarf2_per_objfile
20023 = cu->per_cu->dwarf2_per_objfile;
20025 /* For TUs in DWO files, the DW_AT_stmt_list attribute lives in the
20027 if (cu->dwo_unit && cu->per_cu->is_debug_types)
20028 section = &cu->dwo_unit->dwo_file->sections.line;
20029 else if (cu->per_cu->is_dwz)
20031 struct dwz_file *dwz = dwarf2_get_dwz_file (dwarf2_per_objfile);
20033 section = &dwz->line;
20036 section = &dwarf2_per_objfile->line;
20041 /* Read directory or file name entry format, starting with byte of
20042 format count entries, ULEB128 pairs of entry formats, ULEB128 of
20043 entries count and the entries themselves in the described entry
20047 read_formatted_entries (struct dwarf2_per_objfile *dwarf2_per_objfile,
20048 bfd *abfd, const gdb_byte **bufp,
20049 struct line_header *lh,
20050 const struct comp_unit_head *cu_header,
20051 void (*callback) (struct line_header *lh,
20054 unsigned int mod_time,
20055 unsigned int length))
20057 gdb_byte format_count, formati;
20058 ULONGEST data_count, datai;
20059 const gdb_byte *buf = *bufp;
20060 const gdb_byte *format_header_data;
20061 unsigned int bytes_read;
20063 format_count = read_1_byte (abfd, buf);
20065 format_header_data = buf;
20066 for (formati = 0; formati < format_count; formati++)
20068 read_unsigned_leb128 (abfd, buf, &bytes_read);
20070 read_unsigned_leb128 (abfd, buf, &bytes_read);
20074 data_count = read_unsigned_leb128 (abfd, buf, &bytes_read);
20076 for (datai = 0; datai < data_count; datai++)
20078 const gdb_byte *format = format_header_data;
20079 struct file_entry fe;
20081 for (formati = 0; formati < format_count; formati++)
20083 ULONGEST content_type = read_unsigned_leb128 (abfd, format, &bytes_read);
20084 format += bytes_read;
20086 ULONGEST form = read_unsigned_leb128 (abfd, format, &bytes_read);
20087 format += bytes_read;
20089 gdb::optional<const char *> string;
20090 gdb::optional<unsigned int> uint;
20094 case DW_FORM_string:
20095 string.emplace (read_direct_string (abfd, buf, &bytes_read));
20099 case DW_FORM_line_strp:
20100 string.emplace (read_indirect_line_string (dwarf2_per_objfile,
20107 case DW_FORM_data1:
20108 uint.emplace (read_1_byte (abfd, buf));
20112 case DW_FORM_data2:
20113 uint.emplace (read_2_bytes (abfd, buf));
20117 case DW_FORM_data4:
20118 uint.emplace (read_4_bytes (abfd, buf));
20122 case DW_FORM_data8:
20123 uint.emplace (read_8_bytes (abfd, buf));
20127 case DW_FORM_udata:
20128 uint.emplace (read_unsigned_leb128 (abfd, buf, &bytes_read));
20132 case DW_FORM_block:
20133 /* It is valid only for DW_LNCT_timestamp which is ignored by
20138 switch (content_type)
20141 if (string.has_value ())
20144 case DW_LNCT_directory_index:
20145 if (uint.has_value ())
20146 fe.d_index = (dir_index) *uint;
20148 case DW_LNCT_timestamp:
20149 if (uint.has_value ())
20150 fe.mod_time = *uint;
20153 if (uint.has_value ())
20159 complaint (&symfile_complaints,
20160 _("Unknown format content type %s"),
20161 pulongest (content_type));
20165 callback (lh, fe.name, fe.d_index, fe.mod_time, fe.length);
20171 /* Read the statement program header starting at OFFSET in
20172 .debug_line, or .debug_line.dwo. Return a pointer
20173 to a struct line_header, allocated using xmalloc.
20174 Returns NULL if there is a problem reading the header, e.g., if it
20175 has a version we don't understand.
20177 NOTE: the strings in the include directory and file name tables of
20178 the returned object point into the dwarf line section buffer,
20179 and must not be freed. */
20181 static line_header_up
20182 dwarf_decode_line_header (sect_offset sect_off, struct dwarf2_cu *cu)
20184 const gdb_byte *line_ptr;
20185 unsigned int bytes_read, offset_size;
20187 const char *cur_dir, *cur_file;
20188 struct dwarf2_section_info *section;
20190 struct dwarf2_per_objfile *dwarf2_per_objfile
20191 = cu->per_cu->dwarf2_per_objfile;
20193 section = get_debug_line_section (cu);
20194 dwarf2_read_section (dwarf2_per_objfile->objfile, section);
20195 if (section->buffer == NULL)
20197 if (cu->dwo_unit && cu->per_cu->is_debug_types)
20198 complaint (&symfile_complaints, _("missing .debug_line.dwo section"));
20200 complaint (&symfile_complaints, _("missing .debug_line section"));
20204 /* We can't do this until we know the section is non-empty.
20205 Only then do we know we have such a section. */
20206 abfd = get_section_bfd_owner (section);
20208 /* Make sure that at least there's room for the total_length field.
20209 That could be 12 bytes long, but we're just going to fudge that. */
20210 if (to_underlying (sect_off) + 4 >= section->size)
20212 dwarf2_statement_list_fits_in_line_number_section_complaint ();
20216 line_header_up lh (new line_header ());
20218 lh->sect_off = sect_off;
20219 lh->offset_in_dwz = cu->per_cu->is_dwz;
20221 line_ptr = section->buffer + to_underlying (sect_off);
20223 /* Read in the header. */
20225 read_checked_initial_length_and_offset (abfd, line_ptr, &cu->header,
20226 &bytes_read, &offset_size);
20227 line_ptr += bytes_read;
20228 if (line_ptr + lh->total_length > (section->buffer + section->size))
20230 dwarf2_statement_list_fits_in_line_number_section_complaint ();
20233 lh->statement_program_end = line_ptr + lh->total_length;
20234 lh->version = read_2_bytes (abfd, line_ptr);
20236 if (lh->version > 5)
20238 /* This is a version we don't understand. The format could have
20239 changed in ways we don't handle properly so just punt. */
20240 complaint (&symfile_complaints,
20241 _("unsupported version in .debug_line section"));
20244 if (lh->version >= 5)
20246 gdb_byte segment_selector_size;
20248 /* Skip address size. */
20249 read_1_byte (abfd, line_ptr);
20252 segment_selector_size = read_1_byte (abfd, line_ptr);
20254 if (segment_selector_size != 0)
20256 complaint (&symfile_complaints,
20257 _("unsupported segment selector size %u "
20258 "in .debug_line section"),
20259 segment_selector_size);
20263 lh->header_length = read_offset_1 (abfd, line_ptr, offset_size);
20264 line_ptr += offset_size;
20265 lh->minimum_instruction_length = read_1_byte (abfd, line_ptr);
20267 if (lh->version >= 4)
20269 lh->maximum_ops_per_instruction = read_1_byte (abfd, line_ptr);
20273 lh->maximum_ops_per_instruction = 1;
20275 if (lh->maximum_ops_per_instruction == 0)
20277 lh->maximum_ops_per_instruction = 1;
20278 complaint (&symfile_complaints,
20279 _("invalid maximum_ops_per_instruction "
20280 "in `.debug_line' section"));
20283 lh->default_is_stmt = read_1_byte (abfd, line_ptr);
20285 lh->line_base = read_1_signed_byte (abfd, line_ptr);
20287 lh->line_range = read_1_byte (abfd, line_ptr);
20289 lh->opcode_base = read_1_byte (abfd, line_ptr);
20291 lh->standard_opcode_lengths.reset (new unsigned char[lh->opcode_base]);
20293 lh->standard_opcode_lengths[0] = 1; /* This should never be used anyway. */
20294 for (i = 1; i < lh->opcode_base; ++i)
20296 lh->standard_opcode_lengths[i] = read_1_byte (abfd, line_ptr);
20300 if (lh->version >= 5)
20302 /* Read directory table. */
20303 read_formatted_entries (dwarf2_per_objfile, abfd, &line_ptr, lh.get (),
20305 [] (struct line_header *lh, const char *name,
20306 dir_index d_index, unsigned int mod_time,
20307 unsigned int length)
20309 lh->add_include_dir (name);
20312 /* Read file name table. */
20313 read_formatted_entries (dwarf2_per_objfile, abfd, &line_ptr, lh.get (),
20315 [] (struct line_header *lh, const char *name,
20316 dir_index d_index, unsigned int mod_time,
20317 unsigned int length)
20319 lh->add_file_name (name, d_index, mod_time, length);
20324 /* Read directory table. */
20325 while ((cur_dir = read_direct_string (abfd, line_ptr, &bytes_read)) != NULL)
20327 line_ptr += bytes_read;
20328 lh->add_include_dir (cur_dir);
20330 line_ptr += bytes_read;
20332 /* Read file name table. */
20333 while ((cur_file = read_direct_string (abfd, line_ptr, &bytes_read)) != NULL)
20335 unsigned int mod_time, length;
20338 line_ptr += bytes_read;
20339 d_index = (dir_index) read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
20340 line_ptr += bytes_read;
20341 mod_time = read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
20342 line_ptr += bytes_read;
20343 length = read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
20344 line_ptr += bytes_read;
20346 lh->add_file_name (cur_file, d_index, mod_time, length);
20348 line_ptr += bytes_read;
20350 lh->statement_program_start = line_ptr;
20352 if (line_ptr > (section->buffer + section->size))
20353 complaint (&symfile_complaints,
20354 _("line number info header doesn't "
20355 "fit in `.debug_line' section"));
20360 /* Subroutine of dwarf_decode_lines to simplify it.
20361 Return the file name of the psymtab for included file FILE_INDEX
20362 in line header LH of PST.
20363 COMP_DIR is the compilation directory (DW_AT_comp_dir) or NULL if unknown.
20364 If space for the result is malloc'd, *NAME_HOLDER will be set.
20365 Returns NULL if FILE_INDEX should be ignored, i.e., it is pst->filename. */
20367 static const char *
20368 psymtab_include_file_name (const struct line_header *lh, int file_index,
20369 const struct partial_symtab *pst,
20370 const char *comp_dir,
20371 gdb::unique_xmalloc_ptr<char> *name_holder)
20373 const file_entry &fe = lh->file_names[file_index];
20374 const char *include_name = fe.name;
20375 const char *include_name_to_compare = include_name;
20376 const char *pst_filename;
20379 const char *dir_name = fe.include_dir (lh);
20381 gdb::unique_xmalloc_ptr<char> hold_compare;
20382 if (!IS_ABSOLUTE_PATH (include_name)
20383 && (dir_name != NULL || comp_dir != NULL))
20385 /* Avoid creating a duplicate psymtab for PST.
20386 We do this by comparing INCLUDE_NAME and PST_FILENAME.
20387 Before we do the comparison, however, we need to account
20388 for DIR_NAME and COMP_DIR.
20389 First prepend dir_name (if non-NULL). If we still don't
20390 have an absolute path prepend comp_dir (if non-NULL).
20391 However, the directory we record in the include-file's
20392 psymtab does not contain COMP_DIR (to match the
20393 corresponding symtab(s)).
20398 bash$ gcc -g ./hello.c
20399 include_name = "hello.c"
20401 DW_AT_comp_dir = comp_dir = "/tmp"
20402 DW_AT_name = "./hello.c"
20406 if (dir_name != NULL)
20408 name_holder->reset (concat (dir_name, SLASH_STRING,
20409 include_name, (char *) NULL));
20410 include_name = name_holder->get ();
20411 include_name_to_compare = include_name;
20413 if (!IS_ABSOLUTE_PATH (include_name) && comp_dir != NULL)
20415 hold_compare.reset (concat (comp_dir, SLASH_STRING,
20416 include_name, (char *) NULL));
20417 include_name_to_compare = hold_compare.get ();
20421 pst_filename = pst->filename;
20422 gdb::unique_xmalloc_ptr<char> copied_name;
20423 if (!IS_ABSOLUTE_PATH (pst_filename) && pst->dirname != NULL)
20425 copied_name.reset (concat (pst->dirname, SLASH_STRING,
20426 pst_filename, (char *) NULL));
20427 pst_filename = copied_name.get ();
20430 file_is_pst = FILENAME_CMP (include_name_to_compare, pst_filename) == 0;
20434 return include_name;
20437 /* State machine to track the state of the line number program. */
20439 class lnp_state_machine
20442 /* Initialize a machine state for the start of a line number
20444 lnp_state_machine (gdbarch *arch, line_header *lh, bool record_lines_p);
20446 file_entry *current_file ()
20448 /* lh->file_names is 0-based, but the file name numbers in the
20449 statement program are 1-based. */
20450 return m_line_header->file_name_at (m_file);
20453 /* Record the line in the state machine. END_SEQUENCE is true if
20454 we're processing the end of a sequence. */
20455 void record_line (bool end_sequence);
20457 /* Check address and if invalid nop-out the rest of the lines in this
20459 void check_line_address (struct dwarf2_cu *cu,
20460 const gdb_byte *line_ptr,
20461 CORE_ADDR lowpc, CORE_ADDR address);
20463 void handle_set_discriminator (unsigned int discriminator)
20465 m_discriminator = discriminator;
20466 m_line_has_non_zero_discriminator |= discriminator != 0;
20469 /* Handle DW_LNE_set_address. */
20470 void handle_set_address (CORE_ADDR baseaddr, CORE_ADDR address)
20473 address += baseaddr;
20474 m_address = gdbarch_adjust_dwarf2_line (m_gdbarch, address, false);
20477 /* Handle DW_LNS_advance_pc. */
20478 void handle_advance_pc (CORE_ADDR adjust);
20480 /* Handle a special opcode. */
20481 void handle_special_opcode (unsigned char op_code);
20483 /* Handle DW_LNS_advance_line. */
20484 void handle_advance_line (int line_delta)
20486 advance_line (line_delta);
20489 /* Handle DW_LNS_set_file. */
20490 void handle_set_file (file_name_index file);
20492 /* Handle DW_LNS_negate_stmt. */
20493 void handle_negate_stmt ()
20495 m_is_stmt = !m_is_stmt;
20498 /* Handle DW_LNS_const_add_pc. */
20499 void handle_const_add_pc ();
20501 /* Handle DW_LNS_fixed_advance_pc. */
20502 void handle_fixed_advance_pc (CORE_ADDR addr_adj)
20504 m_address += gdbarch_adjust_dwarf2_line (m_gdbarch, addr_adj, true);
20508 /* Handle DW_LNS_copy. */
20509 void handle_copy ()
20511 record_line (false);
20512 m_discriminator = 0;
20515 /* Handle DW_LNE_end_sequence. */
20516 void handle_end_sequence ()
20518 m_record_line_callback = ::record_line;
20522 /* Advance the line by LINE_DELTA. */
20523 void advance_line (int line_delta)
20525 m_line += line_delta;
20527 if (line_delta != 0)
20528 m_line_has_non_zero_discriminator = m_discriminator != 0;
20531 gdbarch *m_gdbarch;
20533 /* True if we're recording lines.
20534 Otherwise we're building partial symtabs and are just interested in
20535 finding include files mentioned by the line number program. */
20536 bool m_record_lines_p;
20538 /* The line number header. */
20539 line_header *m_line_header;
20541 /* These are part of the standard DWARF line number state machine,
20542 and initialized according to the DWARF spec. */
20544 unsigned char m_op_index = 0;
20545 /* The line table index (1-based) of the current file. */
20546 file_name_index m_file = (file_name_index) 1;
20547 unsigned int m_line = 1;
20549 /* These are initialized in the constructor. */
20551 CORE_ADDR m_address;
20553 unsigned int m_discriminator;
20555 /* Additional bits of state we need to track. */
20557 /* The last file that we called dwarf2_start_subfile for.
20558 This is only used for TLLs. */
20559 unsigned int m_last_file = 0;
20560 /* The last file a line number was recorded for. */
20561 struct subfile *m_last_subfile = NULL;
20563 /* The function to call to record a line. */
20564 record_line_ftype *m_record_line_callback = NULL;
20566 /* The last line number that was recorded, used to coalesce
20567 consecutive entries for the same line. This can happen, for
20568 example, when discriminators are present. PR 17276. */
20569 unsigned int m_last_line = 0;
20570 bool m_line_has_non_zero_discriminator = false;
20574 lnp_state_machine::handle_advance_pc (CORE_ADDR adjust)
20576 CORE_ADDR addr_adj = (((m_op_index + adjust)
20577 / m_line_header->maximum_ops_per_instruction)
20578 * m_line_header->minimum_instruction_length);
20579 m_address += gdbarch_adjust_dwarf2_line (m_gdbarch, addr_adj, true);
20580 m_op_index = ((m_op_index + adjust)
20581 % m_line_header->maximum_ops_per_instruction);
20585 lnp_state_machine::handle_special_opcode (unsigned char op_code)
20587 unsigned char adj_opcode = op_code - m_line_header->opcode_base;
20588 CORE_ADDR addr_adj = (((m_op_index
20589 + (adj_opcode / m_line_header->line_range))
20590 / m_line_header->maximum_ops_per_instruction)
20591 * m_line_header->minimum_instruction_length);
20592 m_address += gdbarch_adjust_dwarf2_line (m_gdbarch, addr_adj, true);
20593 m_op_index = ((m_op_index + (adj_opcode / m_line_header->line_range))
20594 % m_line_header->maximum_ops_per_instruction);
20596 int line_delta = (m_line_header->line_base
20597 + (adj_opcode % m_line_header->line_range));
20598 advance_line (line_delta);
20599 record_line (false);
20600 m_discriminator = 0;
20604 lnp_state_machine::handle_set_file (file_name_index file)
20608 const file_entry *fe = current_file ();
20610 dwarf2_debug_line_missing_file_complaint ();
20611 else if (m_record_lines_p)
20613 const char *dir = fe->include_dir (m_line_header);
20615 m_last_subfile = current_subfile;
20616 m_line_has_non_zero_discriminator = m_discriminator != 0;
20617 dwarf2_start_subfile (fe->name, dir);
20622 lnp_state_machine::handle_const_add_pc ()
20625 = (255 - m_line_header->opcode_base) / m_line_header->line_range;
20628 = (((m_op_index + adjust)
20629 / m_line_header->maximum_ops_per_instruction)
20630 * m_line_header->minimum_instruction_length);
20632 m_address += gdbarch_adjust_dwarf2_line (m_gdbarch, addr_adj, true);
20633 m_op_index = ((m_op_index + adjust)
20634 % m_line_header->maximum_ops_per_instruction);
20637 /* Ignore this record_line request. */
20640 noop_record_line (struct subfile *subfile, int line, CORE_ADDR pc)
20645 /* Return non-zero if we should add LINE to the line number table.
20646 LINE is the line to add, LAST_LINE is the last line that was added,
20647 LAST_SUBFILE is the subfile for LAST_LINE.
20648 LINE_HAS_NON_ZERO_DISCRIMINATOR is non-zero if LINE has ever
20649 had a non-zero discriminator.
20651 We have to be careful in the presence of discriminators.
20652 E.g., for this line:
20654 for (i = 0; i < 100000; i++);
20656 clang can emit four line number entries for that one line,
20657 each with a different discriminator.
20658 See gdb.dwarf2/dw2-single-line-discriminators.exp for an example.
20660 However, we want gdb to coalesce all four entries into one.
20661 Otherwise the user could stepi into the middle of the line and
20662 gdb would get confused about whether the pc really was in the
20663 middle of the line.
20665 Things are further complicated by the fact that two consecutive
20666 line number entries for the same line is a heuristic used by gcc
20667 to denote the end of the prologue. So we can't just discard duplicate
20668 entries, we have to be selective about it. The heuristic we use is
20669 that we only collapse consecutive entries for the same line if at least
20670 one of those entries has a non-zero discriminator. PR 17276.
20672 Note: Addresses in the line number state machine can never go backwards
20673 within one sequence, thus this coalescing is ok. */
20676 dwarf_record_line_p (unsigned int line, unsigned int last_line,
20677 int line_has_non_zero_discriminator,
20678 struct subfile *last_subfile)
20680 if (current_subfile != last_subfile)
20682 if (line != last_line)
20684 /* Same line for the same file that we've seen already.
20685 As a last check, for pr 17276, only record the line if the line
20686 has never had a non-zero discriminator. */
20687 if (!line_has_non_zero_discriminator)
20692 /* Use P_RECORD_LINE to record line number LINE beginning at address ADDRESS
20693 in the line table of subfile SUBFILE. */
20696 dwarf_record_line_1 (struct gdbarch *gdbarch, struct subfile *subfile,
20697 unsigned int line, CORE_ADDR address,
20698 record_line_ftype p_record_line)
20700 CORE_ADDR addr = gdbarch_addr_bits_remove (gdbarch, address);
20702 if (dwarf_line_debug)
20704 fprintf_unfiltered (gdb_stdlog,
20705 "Recording line %u, file %s, address %s\n",
20706 line, lbasename (subfile->name),
20707 paddress (gdbarch, address));
20710 (*p_record_line) (subfile, line, addr);
20713 /* Subroutine of dwarf_decode_lines_1 to simplify it.
20714 Mark the end of a set of line number records.
20715 The arguments are the same as for dwarf_record_line_1.
20716 If SUBFILE is NULL the request is ignored. */
20719 dwarf_finish_line (struct gdbarch *gdbarch, struct subfile *subfile,
20720 CORE_ADDR address, record_line_ftype p_record_line)
20722 if (subfile == NULL)
20725 if (dwarf_line_debug)
20727 fprintf_unfiltered (gdb_stdlog,
20728 "Finishing current line, file %s, address %s\n",
20729 lbasename (subfile->name),
20730 paddress (gdbarch, address));
20733 dwarf_record_line_1 (gdbarch, subfile, 0, address, p_record_line);
20737 lnp_state_machine::record_line (bool end_sequence)
20739 if (dwarf_line_debug)
20741 fprintf_unfiltered (gdb_stdlog,
20742 "Processing actual line %u: file %u,"
20743 " address %s, is_stmt %u, discrim %u\n",
20744 m_line, to_underlying (m_file),
20745 paddress (m_gdbarch, m_address),
20746 m_is_stmt, m_discriminator);
20749 file_entry *fe = current_file ();
20752 dwarf2_debug_line_missing_file_complaint ();
20753 /* For now we ignore lines not starting on an instruction boundary.
20754 But not when processing end_sequence for compatibility with the
20755 previous version of the code. */
20756 else if (m_op_index == 0 || end_sequence)
20758 fe->included_p = 1;
20759 if (m_record_lines_p && m_is_stmt)
20761 if (m_last_subfile != current_subfile || end_sequence)
20763 dwarf_finish_line (m_gdbarch, m_last_subfile,
20764 m_address, m_record_line_callback);
20769 if (dwarf_record_line_p (m_line, m_last_line,
20770 m_line_has_non_zero_discriminator,
20773 dwarf_record_line_1 (m_gdbarch, current_subfile,
20775 m_record_line_callback);
20777 m_last_subfile = current_subfile;
20778 m_last_line = m_line;
20784 lnp_state_machine::lnp_state_machine (gdbarch *arch, line_header *lh,
20785 bool record_lines_p)
20788 m_record_lines_p = record_lines_p;
20789 m_line_header = lh;
20791 m_record_line_callback = ::record_line;
20793 /* Call `gdbarch_adjust_dwarf2_line' on the initial 0 address as if there
20794 was a line entry for it so that the backend has a chance to adjust it
20795 and also record it in case it needs it. This is currently used by MIPS
20796 code, cf. `mips_adjust_dwarf2_line'. */
20797 m_address = gdbarch_adjust_dwarf2_line (arch, 0, 0);
20798 m_is_stmt = lh->default_is_stmt;
20799 m_discriminator = 0;
20803 lnp_state_machine::check_line_address (struct dwarf2_cu *cu,
20804 const gdb_byte *line_ptr,
20805 CORE_ADDR lowpc, CORE_ADDR address)
20807 /* If address < lowpc then it's not a usable value, it's outside the
20808 pc range of the CU. However, we restrict the test to only address
20809 values of zero to preserve GDB's previous behaviour which is to
20810 handle the specific case of a function being GC'd by the linker. */
20812 if (address == 0 && address < lowpc)
20814 /* This line table is for a function which has been
20815 GCd by the linker. Ignore it. PR gdb/12528 */
20817 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
20818 long line_offset = line_ptr - get_debug_line_section (cu)->buffer;
20820 complaint (&symfile_complaints,
20821 _(".debug_line address at offset 0x%lx is 0 [in module %s]"),
20822 line_offset, objfile_name (objfile));
20823 m_record_line_callback = noop_record_line;
20824 /* Note: record_line_callback is left as noop_record_line until
20825 we see DW_LNE_end_sequence. */
20829 /* Subroutine of dwarf_decode_lines to simplify it.
20830 Process the line number information in LH.
20831 If DECODE_FOR_PST_P is non-zero, all we do is process the line number
20832 program in order to set included_p for every referenced header. */
20835 dwarf_decode_lines_1 (struct line_header *lh, struct dwarf2_cu *cu,
20836 const int decode_for_pst_p, CORE_ADDR lowpc)
20838 const gdb_byte *line_ptr, *extended_end;
20839 const gdb_byte *line_end;
20840 unsigned int bytes_read, extended_len;
20841 unsigned char op_code, extended_op;
20842 CORE_ADDR baseaddr;
20843 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
20844 bfd *abfd = objfile->obfd;
20845 struct gdbarch *gdbarch = get_objfile_arch (objfile);
20846 /* True if we're recording line info (as opposed to building partial
20847 symtabs and just interested in finding include files mentioned by
20848 the line number program). */
20849 bool record_lines_p = !decode_for_pst_p;
20851 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
20853 line_ptr = lh->statement_program_start;
20854 line_end = lh->statement_program_end;
20856 /* Read the statement sequences until there's nothing left. */
20857 while (line_ptr < line_end)
20859 /* The DWARF line number program state machine. Reset the state
20860 machine at the start of each sequence. */
20861 lnp_state_machine state_machine (gdbarch, lh, record_lines_p);
20862 bool end_sequence = false;
20864 if (record_lines_p)
20866 /* Start a subfile for the current file of the state
20868 const file_entry *fe = state_machine.current_file ();
20871 dwarf2_start_subfile (fe->name, fe->include_dir (lh));
20874 /* Decode the table. */
20875 while (line_ptr < line_end && !end_sequence)
20877 op_code = read_1_byte (abfd, line_ptr);
20880 if (op_code >= lh->opcode_base)
20882 /* Special opcode. */
20883 state_machine.handle_special_opcode (op_code);
20885 else switch (op_code)
20887 case DW_LNS_extended_op:
20888 extended_len = read_unsigned_leb128 (abfd, line_ptr,
20890 line_ptr += bytes_read;
20891 extended_end = line_ptr + extended_len;
20892 extended_op = read_1_byte (abfd, line_ptr);
20894 switch (extended_op)
20896 case DW_LNE_end_sequence:
20897 state_machine.handle_end_sequence ();
20898 end_sequence = true;
20900 case DW_LNE_set_address:
20903 = read_address (abfd, line_ptr, cu, &bytes_read);
20904 line_ptr += bytes_read;
20906 state_machine.check_line_address (cu, line_ptr,
20908 state_machine.handle_set_address (baseaddr, address);
20911 case DW_LNE_define_file:
20913 const char *cur_file;
20914 unsigned int mod_time, length;
20917 cur_file = read_direct_string (abfd, line_ptr,
20919 line_ptr += bytes_read;
20920 dindex = (dir_index)
20921 read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
20922 line_ptr += bytes_read;
20924 read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
20925 line_ptr += bytes_read;
20927 read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
20928 line_ptr += bytes_read;
20929 lh->add_file_name (cur_file, dindex, mod_time, length);
20932 case DW_LNE_set_discriminator:
20934 /* The discriminator is not interesting to the
20935 debugger; just ignore it. We still need to
20936 check its value though:
20937 if there are consecutive entries for the same
20938 (non-prologue) line we want to coalesce them.
20941 = read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
20942 line_ptr += bytes_read;
20944 state_machine.handle_set_discriminator (discr);
20948 complaint (&symfile_complaints,
20949 _("mangled .debug_line section"));
20952 /* Make sure that we parsed the extended op correctly. If e.g.
20953 we expected a different address size than the producer used,
20954 we may have read the wrong number of bytes. */
20955 if (line_ptr != extended_end)
20957 complaint (&symfile_complaints,
20958 _("mangled .debug_line section"));
20963 state_machine.handle_copy ();
20965 case DW_LNS_advance_pc:
20968 = read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
20969 line_ptr += bytes_read;
20971 state_machine.handle_advance_pc (adjust);
20974 case DW_LNS_advance_line:
20977 = read_signed_leb128 (abfd, line_ptr, &bytes_read);
20978 line_ptr += bytes_read;
20980 state_machine.handle_advance_line (line_delta);
20983 case DW_LNS_set_file:
20985 file_name_index file
20986 = (file_name_index) read_unsigned_leb128 (abfd, line_ptr,
20988 line_ptr += bytes_read;
20990 state_machine.handle_set_file (file);
20993 case DW_LNS_set_column:
20994 (void) read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
20995 line_ptr += bytes_read;
20997 case DW_LNS_negate_stmt:
20998 state_machine.handle_negate_stmt ();
21000 case DW_LNS_set_basic_block:
21002 /* Add to the address register of the state machine the
21003 address increment value corresponding to special opcode
21004 255. I.e., this value is scaled by the minimum
21005 instruction length since special opcode 255 would have
21006 scaled the increment. */
21007 case DW_LNS_const_add_pc:
21008 state_machine.handle_const_add_pc ();
21010 case DW_LNS_fixed_advance_pc:
21012 CORE_ADDR addr_adj = read_2_bytes (abfd, line_ptr);
21015 state_machine.handle_fixed_advance_pc (addr_adj);
21020 /* Unknown standard opcode, ignore it. */
21023 for (i = 0; i < lh->standard_opcode_lengths[op_code]; i++)
21025 (void) read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
21026 line_ptr += bytes_read;
21033 dwarf2_debug_line_missing_end_sequence_complaint ();
21035 /* We got a DW_LNE_end_sequence (or we ran off the end of the buffer,
21036 in which case we still finish recording the last line). */
21037 state_machine.record_line (true);
21041 /* Decode the Line Number Program (LNP) for the given line_header
21042 structure and CU. The actual information extracted and the type
21043 of structures created from the LNP depends on the value of PST.
21045 1. If PST is NULL, then this procedure uses the data from the program
21046 to create all necessary symbol tables, and their linetables.
21048 2. If PST is not NULL, this procedure reads the program to determine
21049 the list of files included by the unit represented by PST, and
21050 builds all the associated partial symbol tables.
21052 COMP_DIR is the compilation directory (DW_AT_comp_dir) or NULL if unknown.
21053 It is used for relative paths in the line table.
21054 NOTE: When processing partial symtabs (pst != NULL),
21055 comp_dir == pst->dirname.
21057 NOTE: It is important that psymtabs have the same file name (via strcmp)
21058 as the corresponding symtab. Since COMP_DIR is not used in the name of the
21059 symtab we don't use it in the name of the psymtabs we create.
21060 E.g. expand_line_sal requires this when finding psymtabs to expand.
21061 A good testcase for this is mb-inline.exp.
21063 LOWPC is the lowest address in CU (or 0 if not known).
21065 Boolean DECODE_MAPPING specifies we need to fully decode .debug_line
21066 for its PC<->lines mapping information. Otherwise only the filename
21067 table is read in. */
21070 dwarf_decode_lines (struct line_header *lh, const char *comp_dir,
21071 struct dwarf2_cu *cu, struct partial_symtab *pst,
21072 CORE_ADDR lowpc, int decode_mapping)
21074 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
21075 const int decode_for_pst_p = (pst != NULL);
21077 if (decode_mapping)
21078 dwarf_decode_lines_1 (lh, cu, decode_for_pst_p, lowpc);
21080 if (decode_for_pst_p)
21084 /* Now that we're done scanning the Line Header Program, we can
21085 create the psymtab of each included file. */
21086 for (file_index = 0; file_index < lh->file_names.size (); file_index++)
21087 if (lh->file_names[file_index].included_p == 1)
21089 gdb::unique_xmalloc_ptr<char> name_holder;
21090 const char *include_name =
21091 psymtab_include_file_name (lh, file_index, pst, comp_dir,
21093 if (include_name != NULL)
21094 dwarf2_create_include_psymtab (include_name, pst, objfile);
21099 /* Make sure a symtab is created for every file, even files
21100 which contain only variables (i.e. no code with associated
21102 struct compunit_symtab *cust = buildsym_compunit_symtab ();
21105 for (i = 0; i < lh->file_names.size (); i++)
21107 file_entry &fe = lh->file_names[i];
21109 dwarf2_start_subfile (fe.name, fe.include_dir (lh));
21111 if (current_subfile->symtab == NULL)
21113 current_subfile->symtab
21114 = allocate_symtab (cust, current_subfile->name);
21116 fe.symtab = current_subfile->symtab;
21121 /* Start a subfile for DWARF. FILENAME is the name of the file and
21122 DIRNAME the name of the source directory which contains FILENAME
21123 or NULL if not known.
21124 This routine tries to keep line numbers from identical absolute and
21125 relative file names in a common subfile.
21127 Using the `list' example from the GDB testsuite, which resides in
21128 /srcdir and compiling it with Irix6.2 cc in /compdir using a filename
21129 of /srcdir/list0.c yields the following debugging information for list0.c:
21131 DW_AT_name: /srcdir/list0.c
21132 DW_AT_comp_dir: /compdir
21133 files.files[0].name: list0.h
21134 files.files[0].dir: /srcdir
21135 files.files[1].name: list0.c
21136 files.files[1].dir: /srcdir
21138 The line number information for list0.c has to end up in a single
21139 subfile, so that `break /srcdir/list0.c:1' works as expected.
21140 start_subfile will ensure that this happens provided that we pass the
21141 concatenation of files.files[1].dir and files.files[1].name as the
21145 dwarf2_start_subfile (const char *filename, const char *dirname)
21149 /* In order not to lose the line information directory,
21150 we concatenate it to the filename when it makes sense.
21151 Note that the Dwarf3 standard says (speaking of filenames in line
21152 information): ``The directory index is ignored for file names
21153 that represent full path names''. Thus ignoring dirname in the
21154 `else' branch below isn't an issue. */
21156 if (!IS_ABSOLUTE_PATH (filename) && dirname != NULL)
21158 copy = concat (dirname, SLASH_STRING, filename, (char *)NULL);
21162 start_subfile (filename);
21168 /* Start a symtab for DWARF.
21169 NAME, COMP_DIR, LOW_PC are passed to start_symtab. */
21171 static struct compunit_symtab *
21172 dwarf2_start_symtab (struct dwarf2_cu *cu,
21173 const char *name, const char *comp_dir, CORE_ADDR low_pc)
21175 struct compunit_symtab *cust
21176 = start_symtab (cu->per_cu->dwarf2_per_objfile->objfile, name, comp_dir,
21177 low_pc, cu->language);
21179 record_debugformat ("DWARF 2");
21180 record_producer (cu->producer);
21182 /* We assume that we're processing GCC output. */
21183 processing_gcc_compilation = 2;
21185 cu->processing_has_namespace_info = 0;
21191 var_decode_location (struct attribute *attr, struct symbol *sym,
21192 struct dwarf2_cu *cu)
21194 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
21195 struct comp_unit_head *cu_header = &cu->header;
21197 /* NOTE drow/2003-01-30: There used to be a comment and some special
21198 code here to turn a symbol with DW_AT_external and a
21199 SYMBOL_VALUE_ADDRESS of 0 into a LOC_UNRESOLVED symbol. This was
21200 necessary for platforms (maybe Alpha, certainly PowerPC GNU/Linux
21201 with some versions of binutils) where shared libraries could have
21202 relocations against symbols in their debug information - the
21203 minimal symbol would have the right address, but the debug info
21204 would not. It's no longer necessary, because we will explicitly
21205 apply relocations when we read in the debug information now. */
21207 /* A DW_AT_location attribute with no contents indicates that a
21208 variable has been optimized away. */
21209 if (attr_form_is_block (attr) && DW_BLOCK (attr)->size == 0)
21211 SYMBOL_ACLASS_INDEX (sym) = LOC_OPTIMIZED_OUT;
21215 /* Handle one degenerate form of location expression specially, to
21216 preserve GDB's previous behavior when section offsets are
21217 specified. If this is just a DW_OP_addr or DW_OP_GNU_addr_index
21218 then mark this symbol as LOC_STATIC. */
21220 if (attr_form_is_block (attr)
21221 && ((DW_BLOCK (attr)->data[0] == DW_OP_addr
21222 && DW_BLOCK (attr)->size == 1 + cu_header->addr_size)
21223 || (DW_BLOCK (attr)->data[0] == DW_OP_GNU_addr_index
21224 && (DW_BLOCK (attr)->size
21225 == 1 + leb128_size (&DW_BLOCK (attr)->data[1])))))
21227 unsigned int dummy;
21229 if (DW_BLOCK (attr)->data[0] == DW_OP_addr)
21230 SYMBOL_VALUE_ADDRESS (sym) =
21231 read_address (objfile->obfd, DW_BLOCK (attr)->data + 1, cu, &dummy);
21233 SYMBOL_VALUE_ADDRESS (sym) =
21234 read_addr_index_from_leb128 (cu, DW_BLOCK (attr)->data + 1, &dummy);
21235 SYMBOL_ACLASS_INDEX (sym) = LOC_STATIC;
21236 fixup_symbol_section (sym, objfile);
21237 SYMBOL_VALUE_ADDRESS (sym) += ANOFFSET (objfile->section_offsets,
21238 SYMBOL_SECTION (sym));
21242 /* NOTE drow/2002-01-30: It might be worthwhile to have a static
21243 expression evaluator, and use LOC_COMPUTED only when necessary
21244 (i.e. when the value of a register or memory location is
21245 referenced, or a thread-local block, etc.). Then again, it might
21246 not be worthwhile. I'm assuming that it isn't unless performance
21247 or memory numbers show me otherwise. */
21249 dwarf2_symbol_mark_computed (attr, sym, cu, 0);
21251 if (SYMBOL_COMPUTED_OPS (sym)->location_has_loclist)
21252 cu->has_loclist = 1;
21255 /* Given a pointer to a DWARF information entry, figure out if we need
21256 to make a symbol table entry for it, and if so, create a new entry
21257 and return a pointer to it.
21258 If TYPE is NULL, determine symbol type from the die, otherwise
21259 used the passed type.
21260 If SPACE is not NULL, use it to hold the new symbol. If it is
21261 NULL, allocate a new symbol on the objfile's obstack. */
21263 static struct symbol *
21264 new_symbol (struct die_info *die, struct type *type, struct dwarf2_cu *cu,
21265 struct symbol *space)
21267 struct dwarf2_per_objfile *dwarf2_per_objfile
21268 = cu->per_cu->dwarf2_per_objfile;
21269 struct objfile *objfile = dwarf2_per_objfile->objfile;
21270 struct gdbarch *gdbarch = get_objfile_arch (objfile);
21271 struct symbol *sym = NULL;
21273 struct attribute *attr = NULL;
21274 struct attribute *attr2 = NULL;
21275 CORE_ADDR baseaddr;
21276 struct pending **list_to_add = NULL;
21278 int inlined_func = (die->tag == DW_TAG_inlined_subroutine);
21280 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
21282 name = dwarf2_name (die, cu);
21285 const char *linkagename;
21286 int suppress_add = 0;
21291 sym = allocate_symbol (objfile);
21292 OBJSTAT (objfile, n_syms++);
21294 /* Cache this symbol's name and the name's demangled form (if any). */
21295 SYMBOL_SET_LANGUAGE (sym, cu->language, &objfile->objfile_obstack);
21296 linkagename = dwarf2_physname (name, die, cu);
21297 SYMBOL_SET_NAMES (sym, linkagename, strlen (linkagename), 0, objfile);
21299 /* Fortran does not have mangling standard and the mangling does differ
21300 between gfortran, iFort etc. */
21301 if (cu->language == language_fortran
21302 && symbol_get_demangled_name (&(sym->ginfo)) == NULL)
21303 symbol_set_demangled_name (&(sym->ginfo),
21304 dwarf2_full_name (name, die, cu),
21307 /* Default assumptions.
21308 Use the passed type or decode it from the die. */
21309 SYMBOL_DOMAIN (sym) = VAR_DOMAIN;
21310 SYMBOL_ACLASS_INDEX (sym) = LOC_OPTIMIZED_OUT;
21312 SYMBOL_TYPE (sym) = type;
21314 SYMBOL_TYPE (sym) = die_type (die, cu);
21315 attr = dwarf2_attr (die,
21316 inlined_func ? DW_AT_call_line : DW_AT_decl_line,
21320 SYMBOL_LINE (sym) = DW_UNSND (attr);
21323 attr = dwarf2_attr (die,
21324 inlined_func ? DW_AT_call_file : DW_AT_decl_file,
21328 file_name_index file_index = (file_name_index) DW_UNSND (attr);
21329 struct file_entry *fe;
21331 if (cu->line_header != NULL)
21332 fe = cu->line_header->file_name_at (file_index);
21337 complaint (&symfile_complaints,
21338 _("file index out of range"));
21340 symbol_set_symtab (sym, fe->symtab);
21346 attr = dwarf2_attr (die, DW_AT_low_pc, cu);
21351 addr = attr_value_as_address (attr);
21352 addr = gdbarch_adjust_dwarf2_addr (gdbarch, addr + baseaddr);
21353 SYMBOL_VALUE_ADDRESS (sym) = addr;
21355 SYMBOL_TYPE (sym) = objfile_type (objfile)->builtin_core_addr;
21356 SYMBOL_DOMAIN (sym) = LABEL_DOMAIN;
21357 SYMBOL_ACLASS_INDEX (sym) = LOC_LABEL;
21358 add_symbol_to_list (sym, cu->list_in_scope);
21360 case DW_TAG_subprogram:
21361 /* SYMBOL_BLOCK_VALUE (sym) will be filled in later by
21363 SYMBOL_ACLASS_INDEX (sym) = LOC_BLOCK;
21364 attr2 = dwarf2_attr (die, DW_AT_external, cu);
21365 if ((attr2 && (DW_UNSND (attr2) != 0))
21366 || cu->language == language_ada)
21368 /* Subprograms marked external are stored as a global symbol.
21369 Ada subprograms, whether marked external or not, are always
21370 stored as a global symbol, because we want to be able to
21371 access them globally. For instance, we want to be able
21372 to break on a nested subprogram without having to
21373 specify the context. */
21374 list_to_add = &global_symbols;
21378 list_to_add = cu->list_in_scope;
21381 case DW_TAG_inlined_subroutine:
21382 /* SYMBOL_BLOCK_VALUE (sym) will be filled in later by
21384 SYMBOL_ACLASS_INDEX (sym) = LOC_BLOCK;
21385 SYMBOL_INLINED (sym) = 1;
21386 list_to_add = cu->list_in_scope;
21388 case DW_TAG_template_value_param:
21390 /* Fall through. */
21391 case DW_TAG_constant:
21392 case DW_TAG_variable:
21393 case DW_TAG_member:
21394 /* Compilation with minimal debug info may result in
21395 variables with missing type entries. Change the
21396 misleading `void' type to something sensible. */
21397 if (TYPE_CODE (SYMBOL_TYPE (sym)) == TYPE_CODE_VOID)
21398 SYMBOL_TYPE (sym) = objfile_type (objfile)->builtin_int;
21400 attr = dwarf2_attr (die, DW_AT_const_value, cu);
21401 /* In the case of DW_TAG_member, we should only be called for
21402 static const members. */
21403 if (die->tag == DW_TAG_member)
21405 /* dwarf2_add_field uses die_is_declaration,
21406 so we do the same. */
21407 gdb_assert (die_is_declaration (die, cu));
21412 dwarf2_const_value (attr, sym, cu);
21413 attr2 = dwarf2_attr (die, DW_AT_external, cu);
21416 if (attr2 && (DW_UNSND (attr2) != 0))
21417 list_to_add = &global_symbols;
21419 list_to_add = cu->list_in_scope;
21423 attr = dwarf2_attr (die, DW_AT_location, cu);
21426 var_decode_location (attr, sym, cu);
21427 attr2 = dwarf2_attr (die, DW_AT_external, cu);
21429 /* Fortran explicitly imports any global symbols to the local
21430 scope by DW_TAG_common_block. */
21431 if (cu->language == language_fortran && die->parent
21432 && die->parent->tag == DW_TAG_common_block)
21435 if (SYMBOL_CLASS (sym) == LOC_STATIC
21436 && SYMBOL_VALUE_ADDRESS (sym) == 0
21437 && !dwarf2_per_objfile->has_section_at_zero)
21439 /* When a static variable is eliminated by the linker,
21440 the corresponding debug information is not stripped
21441 out, but the variable address is set to null;
21442 do not add such variables into symbol table. */
21444 else if (attr2 && (DW_UNSND (attr2) != 0))
21446 /* Workaround gfortran PR debug/40040 - it uses
21447 DW_AT_location for variables in -fPIC libraries which may
21448 get overriden by other libraries/executable and get
21449 a different address. Resolve it by the minimal symbol
21450 which may come from inferior's executable using copy
21451 relocation. Make this workaround only for gfortran as for
21452 other compilers GDB cannot guess the minimal symbol
21453 Fortran mangling kind. */
21454 if (cu->language == language_fortran && die->parent
21455 && die->parent->tag == DW_TAG_module
21457 && startswith (cu->producer, "GNU Fortran"))
21458 SYMBOL_ACLASS_INDEX (sym) = LOC_UNRESOLVED;
21460 /* A variable with DW_AT_external is never static,
21461 but it may be block-scoped. */
21462 list_to_add = (cu->list_in_scope == &file_symbols
21463 ? &global_symbols : cu->list_in_scope);
21466 list_to_add = cu->list_in_scope;
21470 /* We do not know the address of this symbol.
21471 If it is an external symbol and we have type information
21472 for it, enter the symbol as a LOC_UNRESOLVED symbol.
21473 The address of the variable will then be determined from
21474 the minimal symbol table whenever the variable is
21476 attr2 = dwarf2_attr (die, DW_AT_external, cu);
21478 /* Fortran explicitly imports any global symbols to the local
21479 scope by DW_TAG_common_block. */
21480 if (cu->language == language_fortran && die->parent
21481 && die->parent->tag == DW_TAG_common_block)
21483 /* SYMBOL_CLASS doesn't matter here because
21484 read_common_block is going to reset it. */
21486 list_to_add = cu->list_in_scope;
21488 else if (attr2 && (DW_UNSND (attr2) != 0)
21489 && dwarf2_attr (die, DW_AT_type, cu) != NULL)
21491 /* A variable with DW_AT_external is never static, but it
21492 may be block-scoped. */
21493 list_to_add = (cu->list_in_scope == &file_symbols
21494 ? &global_symbols : cu->list_in_scope);
21496 SYMBOL_ACLASS_INDEX (sym) = LOC_UNRESOLVED;
21498 else if (!die_is_declaration (die, cu))
21500 /* Use the default LOC_OPTIMIZED_OUT class. */
21501 gdb_assert (SYMBOL_CLASS (sym) == LOC_OPTIMIZED_OUT);
21503 list_to_add = cu->list_in_scope;
21507 case DW_TAG_formal_parameter:
21508 /* If we are inside a function, mark this as an argument. If
21509 not, we might be looking at an argument to an inlined function
21510 when we do not have enough information to show inlined frames;
21511 pretend it's a local variable in that case so that the user can
21513 if (context_stack_depth > 0
21514 && context_stack[context_stack_depth - 1].name != NULL)
21515 SYMBOL_IS_ARGUMENT (sym) = 1;
21516 attr = dwarf2_attr (die, DW_AT_location, cu);
21519 var_decode_location (attr, sym, cu);
21521 attr = dwarf2_attr (die, DW_AT_const_value, cu);
21524 dwarf2_const_value (attr, sym, cu);
21527 list_to_add = cu->list_in_scope;
21529 case DW_TAG_unspecified_parameters:
21530 /* From varargs functions; gdb doesn't seem to have any
21531 interest in this information, so just ignore it for now.
21534 case DW_TAG_template_type_param:
21536 /* Fall through. */
21537 case DW_TAG_class_type:
21538 case DW_TAG_interface_type:
21539 case DW_TAG_structure_type:
21540 case DW_TAG_union_type:
21541 case DW_TAG_set_type:
21542 case DW_TAG_enumeration_type:
21543 SYMBOL_ACLASS_INDEX (sym) = LOC_TYPEDEF;
21544 SYMBOL_DOMAIN (sym) = STRUCT_DOMAIN;
21547 /* NOTE: carlton/2003-11-10: C++ class symbols shouldn't
21548 really ever be static objects: otherwise, if you try
21549 to, say, break of a class's method and you're in a file
21550 which doesn't mention that class, it won't work unless
21551 the check for all static symbols in lookup_symbol_aux
21552 saves you. See the OtherFileClass tests in
21553 gdb.c++/namespace.exp. */
21557 list_to_add = (cu->list_in_scope == &file_symbols
21558 && cu->language == language_cplus
21559 ? &global_symbols : cu->list_in_scope);
21561 /* The semantics of C++ state that "struct foo {
21562 ... }" also defines a typedef for "foo". */
21563 if (cu->language == language_cplus
21564 || cu->language == language_ada
21565 || cu->language == language_d
21566 || cu->language == language_rust)
21568 /* The symbol's name is already allocated along
21569 with this objfile, so we don't need to
21570 duplicate it for the type. */
21571 if (TYPE_NAME (SYMBOL_TYPE (sym)) == 0)
21572 TYPE_NAME (SYMBOL_TYPE (sym)) = SYMBOL_SEARCH_NAME (sym);
21577 case DW_TAG_typedef:
21578 SYMBOL_ACLASS_INDEX (sym) = LOC_TYPEDEF;
21579 SYMBOL_DOMAIN (sym) = VAR_DOMAIN;
21580 list_to_add = cu->list_in_scope;
21582 case DW_TAG_base_type:
21583 case DW_TAG_subrange_type:
21584 SYMBOL_ACLASS_INDEX (sym) = LOC_TYPEDEF;
21585 SYMBOL_DOMAIN (sym) = VAR_DOMAIN;
21586 list_to_add = cu->list_in_scope;
21588 case DW_TAG_enumerator:
21589 attr = dwarf2_attr (die, DW_AT_const_value, cu);
21592 dwarf2_const_value (attr, sym, cu);
21595 /* NOTE: carlton/2003-11-10: See comment above in the
21596 DW_TAG_class_type, etc. block. */
21598 list_to_add = (cu->list_in_scope == &file_symbols
21599 && cu->language == language_cplus
21600 ? &global_symbols : cu->list_in_scope);
21603 case DW_TAG_imported_declaration:
21604 case DW_TAG_namespace:
21605 SYMBOL_ACLASS_INDEX (sym) = LOC_TYPEDEF;
21606 list_to_add = &global_symbols;
21608 case DW_TAG_module:
21609 SYMBOL_ACLASS_INDEX (sym) = LOC_TYPEDEF;
21610 SYMBOL_DOMAIN (sym) = MODULE_DOMAIN;
21611 list_to_add = &global_symbols;
21613 case DW_TAG_common_block:
21614 SYMBOL_ACLASS_INDEX (sym) = LOC_COMMON_BLOCK;
21615 SYMBOL_DOMAIN (sym) = COMMON_BLOCK_DOMAIN;
21616 add_symbol_to_list (sym, cu->list_in_scope);
21619 /* Not a tag we recognize. Hopefully we aren't processing
21620 trash data, but since we must specifically ignore things
21621 we don't recognize, there is nothing else we should do at
21623 complaint (&symfile_complaints, _("unsupported tag: '%s'"),
21624 dwarf_tag_name (die->tag));
21630 sym->hash_next = objfile->template_symbols;
21631 objfile->template_symbols = sym;
21632 list_to_add = NULL;
21635 if (list_to_add != NULL)
21636 add_symbol_to_list (sym, list_to_add);
21638 /* For the benefit of old versions of GCC, check for anonymous
21639 namespaces based on the demangled name. */
21640 if (!cu->processing_has_namespace_info
21641 && cu->language == language_cplus)
21642 cp_scan_for_anonymous_namespaces (sym, objfile);
21647 /* Given an attr with a DW_FORM_dataN value in host byte order,
21648 zero-extend it as appropriate for the symbol's type. The DWARF
21649 standard (v4) is not entirely clear about the meaning of using
21650 DW_FORM_dataN for a constant with a signed type, where the type is
21651 wider than the data. The conclusion of a discussion on the DWARF
21652 list was that this is unspecified. We choose to always zero-extend
21653 because that is the interpretation long in use by GCC. */
21656 dwarf2_const_value_data (const struct attribute *attr, struct obstack *obstack,
21657 struct dwarf2_cu *cu, LONGEST *value, int bits)
21659 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
21660 enum bfd_endian byte_order = bfd_big_endian (objfile->obfd) ?
21661 BFD_ENDIAN_BIG : BFD_ENDIAN_LITTLE;
21662 LONGEST l = DW_UNSND (attr);
21664 if (bits < sizeof (*value) * 8)
21666 l &= ((LONGEST) 1 << bits) - 1;
21669 else if (bits == sizeof (*value) * 8)
21673 gdb_byte *bytes = (gdb_byte *) obstack_alloc (obstack, bits / 8);
21674 store_unsigned_integer (bytes, bits / 8, byte_order, l);
21681 /* Read a constant value from an attribute. Either set *VALUE, or if
21682 the value does not fit in *VALUE, set *BYTES - either already
21683 allocated on the objfile obstack, or newly allocated on OBSTACK,
21684 or, set *BATON, if we translated the constant to a location
21688 dwarf2_const_value_attr (const struct attribute *attr, struct type *type,
21689 const char *name, struct obstack *obstack,
21690 struct dwarf2_cu *cu,
21691 LONGEST *value, const gdb_byte **bytes,
21692 struct dwarf2_locexpr_baton **baton)
21694 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
21695 struct comp_unit_head *cu_header = &cu->header;
21696 struct dwarf_block *blk;
21697 enum bfd_endian byte_order = (bfd_big_endian (objfile->obfd) ?
21698 BFD_ENDIAN_BIG : BFD_ENDIAN_LITTLE);
21704 switch (attr->form)
21707 case DW_FORM_GNU_addr_index:
21711 if (TYPE_LENGTH (type) != cu_header->addr_size)
21712 dwarf2_const_value_length_mismatch_complaint (name,
21713 cu_header->addr_size,
21714 TYPE_LENGTH (type));
21715 /* Symbols of this form are reasonably rare, so we just
21716 piggyback on the existing location code rather than writing
21717 a new implementation of symbol_computed_ops. */
21718 *baton = XOBNEW (obstack, struct dwarf2_locexpr_baton);
21719 (*baton)->per_cu = cu->per_cu;
21720 gdb_assert ((*baton)->per_cu);
21722 (*baton)->size = 2 + cu_header->addr_size;
21723 data = (gdb_byte *) obstack_alloc (obstack, (*baton)->size);
21724 (*baton)->data = data;
21726 data[0] = DW_OP_addr;
21727 store_unsigned_integer (&data[1], cu_header->addr_size,
21728 byte_order, DW_ADDR (attr));
21729 data[cu_header->addr_size + 1] = DW_OP_stack_value;
21732 case DW_FORM_string:
21734 case DW_FORM_GNU_str_index:
21735 case DW_FORM_GNU_strp_alt:
21736 /* DW_STRING is already allocated on the objfile obstack, point
21738 *bytes = (const gdb_byte *) DW_STRING (attr);
21740 case DW_FORM_block1:
21741 case DW_FORM_block2:
21742 case DW_FORM_block4:
21743 case DW_FORM_block:
21744 case DW_FORM_exprloc:
21745 case DW_FORM_data16:
21746 blk = DW_BLOCK (attr);
21747 if (TYPE_LENGTH (type) != blk->size)
21748 dwarf2_const_value_length_mismatch_complaint (name, blk->size,
21749 TYPE_LENGTH (type));
21750 *bytes = blk->data;
21753 /* The DW_AT_const_value attributes are supposed to carry the
21754 symbol's value "represented as it would be on the target
21755 architecture." By the time we get here, it's already been
21756 converted to host endianness, so we just need to sign- or
21757 zero-extend it as appropriate. */
21758 case DW_FORM_data1:
21759 *bytes = dwarf2_const_value_data (attr, obstack, cu, value, 8);
21761 case DW_FORM_data2:
21762 *bytes = dwarf2_const_value_data (attr, obstack, cu, value, 16);
21764 case DW_FORM_data4:
21765 *bytes = dwarf2_const_value_data (attr, obstack, cu, value, 32);
21767 case DW_FORM_data8:
21768 *bytes = dwarf2_const_value_data (attr, obstack, cu, value, 64);
21771 case DW_FORM_sdata:
21772 case DW_FORM_implicit_const:
21773 *value = DW_SND (attr);
21776 case DW_FORM_udata:
21777 *value = DW_UNSND (attr);
21781 complaint (&symfile_complaints,
21782 _("unsupported const value attribute form: '%s'"),
21783 dwarf_form_name (attr->form));
21790 /* Copy constant value from an attribute to a symbol. */
21793 dwarf2_const_value (const struct attribute *attr, struct symbol *sym,
21794 struct dwarf2_cu *cu)
21796 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
21798 const gdb_byte *bytes;
21799 struct dwarf2_locexpr_baton *baton;
21801 dwarf2_const_value_attr (attr, SYMBOL_TYPE (sym),
21802 SYMBOL_PRINT_NAME (sym),
21803 &objfile->objfile_obstack, cu,
21804 &value, &bytes, &baton);
21808 SYMBOL_LOCATION_BATON (sym) = baton;
21809 SYMBOL_ACLASS_INDEX (sym) = dwarf2_locexpr_index;
21811 else if (bytes != NULL)
21813 SYMBOL_VALUE_BYTES (sym) = bytes;
21814 SYMBOL_ACLASS_INDEX (sym) = LOC_CONST_BYTES;
21818 SYMBOL_VALUE (sym) = value;
21819 SYMBOL_ACLASS_INDEX (sym) = LOC_CONST;
21823 /* Return the type of the die in question using its DW_AT_type attribute. */
21825 static struct type *
21826 die_type (struct die_info *die, struct dwarf2_cu *cu)
21828 struct attribute *type_attr;
21830 type_attr = dwarf2_attr (die, DW_AT_type, cu);
21833 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
21834 /* A missing DW_AT_type represents a void type. */
21835 return objfile_type (objfile)->builtin_void;
21838 return lookup_die_type (die, type_attr, cu);
21841 /* True iff CU's producer generates GNAT Ada auxiliary information
21842 that allows to find parallel types through that information instead
21843 of having to do expensive parallel lookups by type name. */
21846 need_gnat_info (struct dwarf2_cu *cu)
21848 /* Assume that the Ada compiler was GNAT, which always produces
21849 the auxiliary information. */
21850 return (cu->language == language_ada);
21853 /* Return the auxiliary type of the die in question using its
21854 DW_AT_GNAT_descriptive_type attribute. Returns NULL if the
21855 attribute is not present. */
21857 static struct type *
21858 die_descriptive_type (struct die_info *die, struct dwarf2_cu *cu)
21860 struct attribute *type_attr;
21862 type_attr = dwarf2_attr (die, DW_AT_GNAT_descriptive_type, cu);
21866 return lookup_die_type (die, type_attr, cu);
21869 /* If DIE has a descriptive_type attribute, then set the TYPE's
21870 descriptive type accordingly. */
21873 set_descriptive_type (struct type *type, struct die_info *die,
21874 struct dwarf2_cu *cu)
21876 struct type *descriptive_type = die_descriptive_type (die, cu);
21878 if (descriptive_type)
21880 ALLOCATE_GNAT_AUX_TYPE (type);
21881 TYPE_DESCRIPTIVE_TYPE (type) = descriptive_type;
21885 /* Return the containing type of the die in question using its
21886 DW_AT_containing_type attribute. */
21888 static struct type *
21889 die_containing_type (struct die_info *die, struct dwarf2_cu *cu)
21891 struct attribute *type_attr;
21892 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
21894 type_attr = dwarf2_attr (die, DW_AT_containing_type, cu);
21896 error (_("Dwarf Error: Problem turning containing type into gdb type "
21897 "[in module %s]"), objfile_name (objfile));
21899 return lookup_die_type (die, type_attr, cu);
21902 /* Return an error marker type to use for the ill formed type in DIE/CU. */
21904 static struct type *
21905 build_error_marker_type (struct dwarf2_cu *cu, struct die_info *die)
21907 struct dwarf2_per_objfile *dwarf2_per_objfile
21908 = cu->per_cu->dwarf2_per_objfile;
21909 struct objfile *objfile = dwarf2_per_objfile->objfile;
21910 char *message, *saved;
21912 message = xstrprintf (_("<unknown type in %s, CU %s, DIE %s>"),
21913 objfile_name (objfile),
21914 sect_offset_str (cu->header.sect_off),
21915 sect_offset_str (die->sect_off));
21916 saved = (char *) obstack_copy0 (&objfile->objfile_obstack,
21917 message, strlen (message));
21920 return init_type (objfile, TYPE_CODE_ERROR, 0, saved);
21923 /* Look up the type of DIE in CU using its type attribute ATTR.
21924 ATTR must be one of: DW_AT_type, DW_AT_GNAT_descriptive_type,
21925 DW_AT_containing_type.
21926 If there is no type substitute an error marker. */
21928 static struct type *
21929 lookup_die_type (struct die_info *die, const struct attribute *attr,
21930 struct dwarf2_cu *cu)
21932 struct dwarf2_per_objfile *dwarf2_per_objfile
21933 = cu->per_cu->dwarf2_per_objfile;
21934 struct objfile *objfile = dwarf2_per_objfile->objfile;
21935 struct type *this_type;
21937 gdb_assert (attr->name == DW_AT_type
21938 || attr->name == DW_AT_GNAT_descriptive_type
21939 || attr->name == DW_AT_containing_type);
21941 /* First see if we have it cached. */
21943 if (attr->form == DW_FORM_GNU_ref_alt)
21945 struct dwarf2_per_cu_data *per_cu;
21946 sect_offset sect_off = dwarf2_get_ref_die_offset (attr);
21948 per_cu = dwarf2_find_containing_comp_unit (sect_off, 1,
21949 dwarf2_per_objfile);
21950 this_type = get_die_type_at_offset (sect_off, per_cu);
21952 else if (attr_form_is_ref (attr))
21954 sect_offset sect_off = dwarf2_get_ref_die_offset (attr);
21956 this_type = get_die_type_at_offset (sect_off, cu->per_cu);
21958 else if (attr->form == DW_FORM_ref_sig8)
21960 ULONGEST signature = DW_SIGNATURE (attr);
21962 return get_signatured_type (die, signature, cu);
21966 complaint (&symfile_complaints,
21967 _("Dwarf Error: Bad type attribute %s in DIE"
21968 " at %s [in module %s]"),
21969 dwarf_attr_name (attr->name), sect_offset_str (die->sect_off),
21970 objfile_name (objfile));
21971 return build_error_marker_type (cu, die);
21974 /* If not cached we need to read it in. */
21976 if (this_type == NULL)
21978 struct die_info *type_die = NULL;
21979 struct dwarf2_cu *type_cu = cu;
21981 if (attr_form_is_ref (attr))
21982 type_die = follow_die_ref (die, attr, &type_cu);
21983 if (type_die == NULL)
21984 return build_error_marker_type (cu, die);
21985 /* If we find the type now, it's probably because the type came
21986 from an inter-CU reference and the type's CU got expanded before
21988 this_type = read_type_die (type_die, type_cu);
21991 /* If we still don't have a type use an error marker. */
21993 if (this_type == NULL)
21994 return build_error_marker_type (cu, die);
21999 /* Return the type in DIE, CU.
22000 Returns NULL for invalid types.
22002 This first does a lookup in die_type_hash,
22003 and only reads the die in if necessary.
22005 NOTE: This can be called when reading in partial or full symbols. */
22007 static struct type *
22008 read_type_die (struct die_info *die, struct dwarf2_cu *cu)
22010 struct type *this_type;
22012 this_type = get_die_type (die, cu);
22016 return read_type_die_1 (die, cu);
22019 /* Read the type in DIE, CU.
22020 Returns NULL for invalid types. */
22022 static struct type *
22023 read_type_die_1 (struct die_info *die, struct dwarf2_cu *cu)
22025 struct type *this_type = NULL;
22029 case DW_TAG_class_type:
22030 case DW_TAG_interface_type:
22031 case DW_TAG_structure_type:
22032 case DW_TAG_union_type:
22033 this_type = read_structure_type (die, cu);
22035 case DW_TAG_enumeration_type:
22036 this_type = read_enumeration_type (die, cu);
22038 case DW_TAG_subprogram:
22039 case DW_TAG_subroutine_type:
22040 case DW_TAG_inlined_subroutine:
22041 this_type = read_subroutine_type (die, cu);
22043 case DW_TAG_array_type:
22044 this_type = read_array_type (die, cu);
22046 case DW_TAG_set_type:
22047 this_type = read_set_type (die, cu);
22049 case DW_TAG_pointer_type:
22050 this_type = read_tag_pointer_type (die, cu);
22052 case DW_TAG_ptr_to_member_type:
22053 this_type = read_tag_ptr_to_member_type (die, cu);
22055 case DW_TAG_reference_type:
22056 this_type = read_tag_reference_type (die, cu, TYPE_CODE_REF);
22058 case DW_TAG_rvalue_reference_type:
22059 this_type = read_tag_reference_type (die, cu, TYPE_CODE_RVALUE_REF);
22061 case DW_TAG_const_type:
22062 this_type = read_tag_const_type (die, cu);
22064 case DW_TAG_volatile_type:
22065 this_type = read_tag_volatile_type (die, cu);
22067 case DW_TAG_restrict_type:
22068 this_type = read_tag_restrict_type (die, cu);
22070 case DW_TAG_string_type:
22071 this_type = read_tag_string_type (die, cu);
22073 case DW_TAG_typedef:
22074 this_type = read_typedef (die, cu);
22076 case DW_TAG_subrange_type:
22077 this_type = read_subrange_type (die, cu);
22079 case DW_TAG_base_type:
22080 this_type = read_base_type (die, cu);
22082 case DW_TAG_unspecified_type:
22083 this_type = read_unspecified_type (die, cu);
22085 case DW_TAG_namespace:
22086 this_type = read_namespace_type (die, cu);
22088 case DW_TAG_module:
22089 this_type = read_module_type (die, cu);
22091 case DW_TAG_atomic_type:
22092 this_type = read_tag_atomic_type (die, cu);
22095 complaint (&symfile_complaints,
22096 _("unexpected tag in read_type_die: '%s'"),
22097 dwarf_tag_name (die->tag));
22104 /* See if we can figure out if the class lives in a namespace. We do
22105 this by looking for a member function; its demangled name will
22106 contain namespace info, if there is any.
22107 Return the computed name or NULL.
22108 Space for the result is allocated on the objfile's obstack.
22109 This is the full-die version of guess_partial_die_structure_name.
22110 In this case we know DIE has no useful parent. */
22113 guess_full_die_structure_name (struct die_info *die, struct dwarf2_cu *cu)
22115 struct die_info *spec_die;
22116 struct dwarf2_cu *spec_cu;
22117 struct die_info *child;
22118 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
22121 spec_die = die_specification (die, &spec_cu);
22122 if (spec_die != NULL)
22128 for (child = die->child;
22130 child = child->sibling)
22132 if (child->tag == DW_TAG_subprogram)
22134 const char *linkage_name = dw2_linkage_name (child, cu);
22136 if (linkage_name != NULL)
22139 = language_class_name_from_physname (cu->language_defn,
22143 if (actual_name != NULL)
22145 const char *die_name = dwarf2_name (die, cu);
22147 if (die_name != NULL
22148 && strcmp (die_name, actual_name) != 0)
22150 /* Strip off the class name from the full name.
22151 We want the prefix. */
22152 int die_name_len = strlen (die_name);
22153 int actual_name_len = strlen (actual_name);
22155 /* Test for '::' as a sanity check. */
22156 if (actual_name_len > die_name_len + 2
22157 && actual_name[actual_name_len
22158 - die_name_len - 1] == ':')
22159 name = (char *) obstack_copy0 (
22160 &objfile->per_bfd->storage_obstack,
22161 actual_name, actual_name_len - die_name_len - 2);
22164 xfree (actual_name);
22173 /* GCC might emit a nameless typedef that has a linkage name. Determine the
22174 prefix part in such case. See
22175 http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47510. */
22177 static const char *
22178 anonymous_struct_prefix (struct die_info *die, struct dwarf2_cu *cu)
22180 struct attribute *attr;
22183 if (die->tag != DW_TAG_class_type && die->tag != DW_TAG_interface_type
22184 && die->tag != DW_TAG_structure_type && die->tag != DW_TAG_union_type)
22187 if (dwarf2_string_attr (die, DW_AT_name, cu) != NULL)
22190 attr = dw2_linkage_name_attr (die, cu);
22191 if (attr == NULL || DW_STRING (attr) == NULL)
22194 /* dwarf2_name had to be already called. */
22195 gdb_assert (DW_STRING_IS_CANONICAL (attr));
22197 /* Strip the base name, keep any leading namespaces/classes. */
22198 base = strrchr (DW_STRING (attr), ':');
22199 if (base == NULL || base == DW_STRING (attr) || base[-1] != ':')
22202 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
22203 return (char *) obstack_copy0 (&objfile->per_bfd->storage_obstack,
22205 &base[-1] - DW_STRING (attr));
22208 /* Return the name of the namespace/class that DIE is defined within,
22209 or "" if we can't tell. The caller should not xfree the result.
22211 For example, if we're within the method foo() in the following
22221 then determine_prefix on foo's die will return "N::C". */
22223 static const char *
22224 determine_prefix (struct die_info *die, struct dwarf2_cu *cu)
22226 struct dwarf2_per_objfile *dwarf2_per_objfile
22227 = cu->per_cu->dwarf2_per_objfile;
22228 struct die_info *parent, *spec_die;
22229 struct dwarf2_cu *spec_cu;
22230 struct type *parent_type;
22231 const char *retval;
22233 if (cu->language != language_cplus
22234 && cu->language != language_fortran && cu->language != language_d
22235 && cu->language != language_rust)
22238 retval = anonymous_struct_prefix (die, cu);
22242 /* We have to be careful in the presence of DW_AT_specification.
22243 For example, with GCC 3.4, given the code
22247 // Definition of N::foo.
22251 then we'll have a tree of DIEs like this:
22253 1: DW_TAG_compile_unit
22254 2: DW_TAG_namespace // N
22255 3: DW_TAG_subprogram // declaration of N::foo
22256 4: DW_TAG_subprogram // definition of N::foo
22257 DW_AT_specification // refers to die #3
22259 Thus, when processing die #4, we have to pretend that we're in
22260 the context of its DW_AT_specification, namely the contex of die
22263 spec_die = die_specification (die, &spec_cu);
22264 if (spec_die == NULL)
22265 parent = die->parent;
22268 parent = spec_die->parent;
22272 if (parent == NULL)
22274 else if (parent->building_fullname)
22277 const char *parent_name;
22279 /* It has been seen on RealView 2.2 built binaries,
22280 DW_TAG_template_type_param types actually _defined_ as
22281 children of the parent class:
22284 template class <class Enum> Class{};
22285 Class<enum E> class_e;
22287 1: DW_TAG_class_type (Class)
22288 2: DW_TAG_enumeration_type (E)
22289 3: DW_TAG_enumerator (enum1:0)
22290 3: DW_TAG_enumerator (enum2:1)
22292 2: DW_TAG_template_type_param
22293 DW_AT_type DW_FORM_ref_udata (E)
22295 Besides being broken debug info, it can put GDB into an
22296 infinite loop. Consider:
22298 When we're building the full name for Class<E>, we'll start
22299 at Class, and go look over its template type parameters,
22300 finding E. We'll then try to build the full name of E, and
22301 reach here. We're now trying to build the full name of E,
22302 and look over the parent DIE for containing scope. In the
22303 broken case, if we followed the parent DIE of E, we'd again
22304 find Class, and once again go look at its template type
22305 arguments, etc., etc. Simply don't consider such parent die
22306 as source-level parent of this die (it can't be, the language
22307 doesn't allow it), and break the loop here. */
22308 name = dwarf2_name (die, cu);
22309 parent_name = dwarf2_name (parent, cu);
22310 complaint (&symfile_complaints,
22311 _("template param type '%s' defined within parent '%s'"),
22312 name ? name : "<unknown>",
22313 parent_name ? parent_name : "<unknown>");
22317 switch (parent->tag)
22319 case DW_TAG_namespace:
22320 parent_type = read_type_die (parent, cu);
22321 /* GCC 4.0 and 4.1 had a bug (PR c++/28460) where they generated bogus
22322 DW_TAG_namespace DIEs with a name of "::" for the global namespace.
22323 Work around this problem here. */
22324 if (cu->language == language_cplus
22325 && strcmp (TYPE_TAG_NAME (parent_type), "::") == 0)
22327 /* We give a name to even anonymous namespaces. */
22328 return TYPE_TAG_NAME (parent_type);
22329 case DW_TAG_class_type:
22330 case DW_TAG_interface_type:
22331 case DW_TAG_structure_type:
22332 case DW_TAG_union_type:
22333 case DW_TAG_module:
22334 parent_type = read_type_die (parent, cu);
22335 if (TYPE_TAG_NAME (parent_type) != NULL)
22336 return TYPE_TAG_NAME (parent_type);
22338 /* An anonymous structure is only allowed non-static data
22339 members; no typedefs, no member functions, et cetera.
22340 So it does not need a prefix. */
22342 case DW_TAG_compile_unit:
22343 case DW_TAG_partial_unit:
22344 /* gcc-4.5 -gdwarf-4 can drop the enclosing namespace. Cope. */
22345 if (cu->language == language_cplus
22346 && !VEC_empty (dwarf2_section_info_def, dwarf2_per_objfile->types)
22347 && die->child != NULL
22348 && (die->tag == DW_TAG_class_type
22349 || die->tag == DW_TAG_structure_type
22350 || die->tag == DW_TAG_union_type))
22352 char *name = guess_full_die_structure_name (die, cu);
22357 case DW_TAG_enumeration_type:
22358 parent_type = read_type_die (parent, cu);
22359 if (TYPE_DECLARED_CLASS (parent_type))
22361 if (TYPE_TAG_NAME (parent_type) != NULL)
22362 return TYPE_TAG_NAME (parent_type);
22365 /* Fall through. */
22367 return determine_prefix (parent, cu);
22371 /* Return a newly-allocated string formed by concatenating PREFIX and SUFFIX
22372 with appropriate separator. If PREFIX or SUFFIX is NULL or empty, then
22373 simply copy the SUFFIX or PREFIX, respectively. If OBS is non-null, perform
22374 an obconcat, otherwise allocate storage for the result. The CU argument is
22375 used to determine the language and hence, the appropriate separator. */
22377 #define MAX_SEP_LEN 7 /* strlen ("__") + strlen ("_MOD_") */
22380 typename_concat (struct obstack *obs, const char *prefix, const char *suffix,
22381 int physname, struct dwarf2_cu *cu)
22383 const char *lead = "";
22386 if (suffix == NULL || suffix[0] == '\0'
22387 || prefix == NULL || prefix[0] == '\0')
22389 else if (cu->language == language_d)
22391 /* For D, the 'main' function could be defined in any module, but it
22392 should never be prefixed. */
22393 if (strcmp (suffix, "D main") == 0)
22401 else if (cu->language == language_fortran && physname)
22403 /* This is gfortran specific mangling. Normally DW_AT_linkage_name or
22404 DW_AT_MIPS_linkage_name is preferred and used instead. */
22412 if (prefix == NULL)
22414 if (suffix == NULL)
22421 xmalloc (strlen (prefix) + MAX_SEP_LEN + strlen (suffix) + 1));
22423 strcpy (retval, lead);
22424 strcat (retval, prefix);
22425 strcat (retval, sep);
22426 strcat (retval, suffix);
22431 /* We have an obstack. */
22432 return obconcat (obs, lead, prefix, sep, suffix, (char *) NULL);
22436 /* Return sibling of die, NULL if no sibling. */
22438 static struct die_info *
22439 sibling_die (struct die_info *die)
22441 return die->sibling;
22444 /* Get name of a die, return NULL if not found. */
22446 static const char *
22447 dwarf2_canonicalize_name (const char *name, struct dwarf2_cu *cu,
22448 struct obstack *obstack)
22450 if (name && cu->language == language_cplus)
22452 std::string canon_name = cp_canonicalize_string (name);
22454 if (!canon_name.empty ())
22456 if (canon_name != name)
22457 name = (const char *) obstack_copy0 (obstack,
22458 canon_name.c_str (),
22459 canon_name.length ());
22466 /* Get name of a die, return NULL if not found.
22467 Anonymous namespaces are converted to their magic string. */
22469 static const char *
22470 dwarf2_name (struct die_info *die, struct dwarf2_cu *cu)
22472 struct attribute *attr;
22473 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
22475 attr = dwarf2_attr (die, DW_AT_name, cu);
22476 if ((!attr || !DW_STRING (attr))
22477 && die->tag != DW_TAG_namespace
22478 && die->tag != DW_TAG_class_type
22479 && die->tag != DW_TAG_interface_type
22480 && die->tag != DW_TAG_structure_type
22481 && die->tag != DW_TAG_union_type)
22486 case DW_TAG_compile_unit:
22487 case DW_TAG_partial_unit:
22488 /* Compilation units have a DW_AT_name that is a filename, not
22489 a source language identifier. */
22490 case DW_TAG_enumeration_type:
22491 case DW_TAG_enumerator:
22492 /* These tags always have simple identifiers already; no need
22493 to canonicalize them. */
22494 return DW_STRING (attr);
22496 case DW_TAG_namespace:
22497 if (attr != NULL && DW_STRING (attr) != NULL)
22498 return DW_STRING (attr);
22499 return CP_ANONYMOUS_NAMESPACE_STR;
22501 case DW_TAG_class_type:
22502 case DW_TAG_interface_type:
22503 case DW_TAG_structure_type:
22504 case DW_TAG_union_type:
22505 /* Some GCC versions emit spurious DW_AT_name attributes for unnamed
22506 structures or unions. These were of the form "._%d" in GCC 4.1,
22507 or simply "<anonymous struct>" or "<anonymous union>" in GCC 4.3
22508 and GCC 4.4. We work around this problem by ignoring these. */
22509 if (attr && DW_STRING (attr)
22510 && (startswith (DW_STRING (attr), "._")
22511 || startswith (DW_STRING (attr), "<anonymous")))
22514 /* GCC might emit a nameless typedef that has a linkage name. See
22515 http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47510. */
22516 if (!attr || DW_STRING (attr) == NULL)
22518 char *demangled = NULL;
22520 attr = dw2_linkage_name_attr (die, cu);
22521 if (attr == NULL || DW_STRING (attr) == NULL)
22524 /* Avoid demangling DW_STRING (attr) the second time on a second
22525 call for the same DIE. */
22526 if (!DW_STRING_IS_CANONICAL (attr))
22527 demangled = gdb_demangle (DW_STRING (attr), DMGL_TYPES);
22533 /* FIXME: we already did this for the partial symbol... */
22536 obstack_copy0 (&objfile->per_bfd->storage_obstack,
22537 demangled, strlen (demangled)));
22538 DW_STRING_IS_CANONICAL (attr) = 1;
22541 /* Strip any leading namespaces/classes, keep only the base name.
22542 DW_AT_name for named DIEs does not contain the prefixes. */
22543 base = strrchr (DW_STRING (attr), ':');
22544 if (base && base > DW_STRING (attr) && base[-1] == ':')
22547 return DW_STRING (attr);
22556 if (!DW_STRING_IS_CANONICAL (attr))
22559 = dwarf2_canonicalize_name (DW_STRING (attr), cu,
22560 &objfile->per_bfd->storage_obstack);
22561 DW_STRING_IS_CANONICAL (attr) = 1;
22563 return DW_STRING (attr);
22566 /* Return the die that this die in an extension of, or NULL if there
22567 is none. *EXT_CU is the CU containing DIE on input, and the CU
22568 containing the return value on output. */
22570 static struct die_info *
22571 dwarf2_extension (struct die_info *die, struct dwarf2_cu **ext_cu)
22573 struct attribute *attr;
22575 attr = dwarf2_attr (die, DW_AT_extension, *ext_cu);
22579 return follow_die_ref (die, attr, ext_cu);
22582 /* Convert a DIE tag into its string name. */
22584 static const char *
22585 dwarf_tag_name (unsigned tag)
22587 const char *name = get_DW_TAG_name (tag);
22590 return "DW_TAG_<unknown>";
22595 /* Convert a DWARF attribute code into its string name. */
22597 static const char *
22598 dwarf_attr_name (unsigned attr)
22602 #ifdef MIPS /* collides with DW_AT_HP_block_index */
22603 if (attr == DW_AT_MIPS_fde)
22604 return "DW_AT_MIPS_fde";
22606 if (attr == DW_AT_HP_block_index)
22607 return "DW_AT_HP_block_index";
22610 name = get_DW_AT_name (attr);
22613 return "DW_AT_<unknown>";
22618 /* Convert a DWARF value form code into its string name. */
22620 static const char *
22621 dwarf_form_name (unsigned form)
22623 const char *name = get_DW_FORM_name (form);
22626 return "DW_FORM_<unknown>";
22631 static const char *
22632 dwarf_bool_name (unsigned mybool)
22640 /* Convert a DWARF type code into its string name. */
22642 static const char *
22643 dwarf_type_encoding_name (unsigned enc)
22645 const char *name = get_DW_ATE_name (enc);
22648 return "DW_ATE_<unknown>";
22654 dump_die_shallow (struct ui_file *f, int indent, struct die_info *die)
22658 print_spaces (indent, f);
22659 fprintf_unfiltered (f, "Die: %s (abbrev %d, offset %s)\n",
22660 dwarf_tag_name (die->tag), die->abbrev,
22661 sect_offset_str (die->sect_off));
22663 if (die->parent != NULL)
22665 print_spaces (indent, f);
22666 fprintf_unfiltered (f, " parent at offset: %s\n",
22667 sect_offset_str (die->parent->sect_off));
22670 print_spaces (indent, f);
22671 fprintf_unfiltered (f, " has children: %s\n",
22672 dwarf_bool_name (die->child != NULL));
22674 print_spaces (indent, f);
22675 fprintf_unfiltered (f, " attributes:\n");
22677 for (i = 0; i < die->num_attrs; ++i)
22679 print_spaces (indent, f);
22680 fprintf_unfiltered (f, " %s (%s) ",
22681 dwarf_attr_name (die->attrs[i].name),
22682 dwarf_form_name (die->attrs[i].form));
22684 switch (die->attrs[i].form)
22687 case DW_FORM_GNU_addr_index:
22688 fprintf_unfiltered (f, "address: ");
22689 fputs_filtered (hex_string (DW_ADDR (&die->attrs[i])), f);
22691 case DW_FORM_block2:
22692 case DW_FORM_block4:
22693 case DW_FORM_block:
22694 case DW_FORM_block1:
22695 fprintf_unfiltered (f, "block: size %s",
22696 pulongest (DW_BLOCK (&die->attrs[i])->size));
22698 case DW_FORM_exprloc:
22699 fprintf_unfiltered (f, "expression: size %s",
22700 pulongest (DW_BLOCK (&die->attrs[i])->size));
22702 case DW_FORM_data16:
22703 fprintf_unfiltered (f, "constant of 16 bytes");
22705 case DW_FORM_ref_addr:
22706 fprintf_unfiltered (f, "ref address: ");
22707 fputs_filtered (hex_string (DW_UNSND (&die->attrs[i])), f);
22709 case DW_FORM_GNU_ref_alt:
22710 fprintf_unfiltered (f, "alt ref address: ");
22711 fputs_filtered (hex_string (DW_UNSND (&die->attrs[i])), f);
22717 case DW_FORM_ref_udata:
22718 fprintf_unfiltered (f, "constant ref: 0x%lx (adjusted)",
22719 (long) (DW_UNSND (&die->attrs[i])));
22721 case DW_FORM_data1:
22722 case DW_FORM_data2:
22723 case DW_FORM_data4:
22724 case DW_FORM_data8:
22725 case DW_FORM_udata:
22726 case DW_FORM_sdata:
22727 fprintf_unfiltered (f, "constant: %s",
22728 pulongest (DW_UNSND (&die->attrs[i])));
22730 case DW_FORM_sec_offset:
22731 fprintf_unfiltered (f, "section offset: %s",
22732 pulongest (DW_UNSND (&die->attrs[i])));
22734 case DW_FORM_ref_sig8:
22735 fprintf_unfiltered (f, "signature: %s",
22736 hex_string (DW_SIGNATURE (&die->attrs[i])));
22738 case DW_FORM_string:
22740 case DW_FORM_line_strp:
22741 case DW_FORM_GNU_str_index:
22742 case DW_FORM_GNU_strp_alt:
22743 fprintf_unfiltered (f, "string: \"%s\" (%s canonicalized)",
22744 DW_STRING (&die->attrs[i])
22745 ? DW_STRING (&die->attrs[i]) : "",
22746 DW_STRING_IS_CANONICAL (&die->attrs[i]) ? "is" : "not");
22749 if (DW_UNSND (&die->attrs[i]))
22750 fprintf_unfiltered (f, "flag: TRUE");
22752 fprintf_unfiltered (f, "flag: FALSE");
22754 case DW_FORM_flag_present:
22755 fprintf_unfiltered (f, "flag: TRUE");
22757 case DW_FORM_indirect:
22758 /* The reader will have reduced the indirect form to
22759 the "base form" so this form should not occur. */
22760 fprintf_unfiltered (f,
22761 "unexpected attribute form: DW_FORM_indirect");
22763 case DW_FORM_implicit_const:
22764 fprintf_unfiltered (f, "constant: %s",
22765 plongest (DW_SND (&die->attrs[i])));
22768 fprintf_unfiltered (f, "unsupported attribute form: %d.",
22769 die->attrs[i].form);
22772 fprintf_unfiltered (f, "\n");
22777 dump_die_for_error (struct die_info *die)
22779 dump_die_shallow (gdb_stderr, 0, die);
22783 dump_die_1 (struct ui_file *f, int level, int max_level, struct die_info *die)
22785 int indent = level * 4;
22787 gdb_assert (die != NULL);
22789 if (level >= max_level)
22792 dump_die_shallow (f, indent, die);
22794 if (die->child != NULL)
22796 print_spaces (indent, f);
22797 fprintf_unfiltered (f, " Children:");
22798 if (level + 1 < max_level)
22800 fprintf_unfiltered (f, "\n");
22801 dump_die_1 (f, level + 1, max_level, die->child);
22805 fprintf_unfiltered (f,
22806 " [not printed, max nesting level reached]\n");
22810 if (die->sibling != NULL && level > 0)
22812 dump_die_1 (f, level, max_level, die->sibling);
22816 /* This is called from the pdie macro in gdbinit.in.
22817 It's not static so gcc will keep a copy callable from gdb. */
22820 dump_die (struct die_info *die, int max_level)
22822 dump_die_1 (gdb_stdlog, 0, max_level, die);
22826 store_in_ref_table (struct die_info *die, struct dwarf2_cu *cu)
22830 slot = htab_find_slot_with_hash (cu->die_hash, die,
22831 to_underlying (die->sect_off),
22837 /* Return DIE offset of ATTR. Return 0 with complaint if ATTR is not of the
22841 dwarf2_get_ref_die_offset (const struct attribute *attr)
22843 if (attr_form_is_ref (attr))
22844 return (sect_offset) DW_UNSND (attr);
22846 complaint (&symfile_complaints,
22847 _("unsupported die ref attribute form: '%s'"),
22848 dwarf_form_name (attr->form));
22852 /* Return the constant value held by ATTR. Return DEFAULT_VALUE if
22853 * the value held by the attribute is not constant. */
22856 dwarf2_get_attr_constant_value (const struct attribute *attr, int default_value)
22858 if (attr->form == DW_FORM_sdata || attr->form == DW_FORM_implicit_const)
22859 return DW_SND (attr);
22860 else if (attr->form == DW_FORM_udata
22861 || attr->form == DW_FORM_data1
22862 || attr->form == DW_FORM_data2
22863 || attr->form == DW_FORM_data4
22864 || attr->form == DW_FORM_data8)
22865 return DW_UNSND (attr);
22868 /* For DW_FORM_data16 see attr_form_is_constant. */
22869 complaint (&symfile_complaints,
22870 _("Attribute value is not a constant (%s)"),
22871 dwarf_form_name (attr->form));
22872 return default_value;
22876 /* Follow reference or signature attribute ATTR of SRC_DIE.
22877 On entry *REF_CU is the CU of SRC_DIE.
22878 On exit *REF_CU is the CU of the result. */
22880 static struct die_info *
22881 follow_die_ref_or_sig (struct die_info *src_die, const struct attribute *attr,
22882 struct dwarf2_cu **ref_cu)
22884 struct die_info *die;
22886 if (attr_form_is_ref (attr))
22887 die = follow_die_ref (src_die, attr, ref_cu);
22888 else if (attr->form == DW_FORM_ref_sig8)
22889 die = follow_die_sig (src_die, attr, ref_cu);
22892 dump_die_for_error (src_die);
22893 error (_("Dwarf Error: Expected reference attribute [in module %s]"),
22894 objfile_name ((*ref_cu)->per_cu->dwarf2_per_objfile->objfile));
22900 /* Follow reference OFFSET.
22901 On entry *REF_CU is the CU of the source die referencing OFFSET.
22902 On exit *REF_CU is the CU of the result.
22903 Returns NULL if OFFSET is invalid. */
22905 static struct die_info *
22906 follow_die_offset (sect_offset sect_off, int offset_in_dwz,
22907 struct dwarf2_cu **ref_cu)
22909 struct die_info temp_die;
22910 struct dwarf2_cu *target_cu, *cu = *ref_cu;
22911 struct dwarf2_per_objfile *dwarf2_per_objfile
22912 = cu->per_cu->dwarf2_per_objfile;
22913 struct objfile *objfile = dwarf2_per_objfile->objfile;
22915 gdb_assert (cu->per_cu != NULL);
22919 if (cu->per_cu->is_debug_types)
22921 /* .debug_types CUs cannot reference anything outside their CU.
22922 If they need to, they have to reference a signatured type via
22923 DW_FORM_ref_sig8. */
22924 if (!offset_in_cu_p (&cu->header, sect_off))
22927 else if (offset_in_dwz != cu->per_cu->is_dwz
22928 || !offset_in_cu_p (&cu->header, sect_off))
22930 struct dwarf2_per_cu_data *per_cu;
22932 per_cu = dwarf2_find_containing_comp_unit (sect_off, offset_in_dwz,
22933 dwarf2_per_objfile);
22935 /* If necessary, add it to the queue and load its DIEs. */
22936 if (maybe_queue_comp_unit (cu, per_cu, cu->language))
22937 load_full_comp_unit (per_cu, cu->language);
22939 target_cu = per_cu->cu;
22941 else if (cu->dies == NULL)
22943 /* We're loading full DIEs during partial symbol reading. */
22944 gdb_assert (dwarf2_per_objfile->reading_partial_symbols);
22945 load_full_comp_unit (cu->per_cu, language_minimal);
22948 *ref_cu = target_cu;
22949 temp_die.sect_off = sect_off;
22950 return (struct die_info *) htab_find_with_hash (target_cu->die_hash,
22952 to_underlying (sect_off));
22955 /* Follow reference attribute ATTR of SRC_DIE.
22956 On entry *REF_CU is the CU of SRC_DIE.
22957 On exit *REF_CU is the CU of the result. */
22959 static struct die_info *
22960 follow_die_ref (struct die_info *src_die, const struct attribute *attr,
22961 struct dwarf2_cu **ref_cu)
22963 sect_offset sect_off = dwarf2_get_ref_die_offset (attr);
22964 struct dwarf2_cu *cu = *ref_cu;
22965 struct die_info *die;
22967 die = follow_die_offset (sect_off,
22968 (attr->form == DW_FORM_GNU_ref_alt
22969 || cu->per_cu->is_dwz),
22972 error (_("Dwarf Error: Cannot find DIE at %s referenced from DIE "
22973 "at %s [in module %s]"),
22974 sect_offset_str (sect_off), sect_offset_str (src_die->sect_off),
22975 objfile_name (cu->per_cu->dwarf2_per_objfile->objfile));
22980 /* Return DWARF block referenced by DW_AT_location of DIE at SECT_OFF at PER_CU.
22981 Returned value is intended for DW_OP_call*. Returned
22982 dwarf2_locexpr_baton->data has lifetime of
22983 PER_CU->DWARF2_PER_OBJFILE->OBJFILE. */
22985 struct dwarf2_locexpr_baton
22986 dwarf2_fetch_die_loc_sect_off (sect_offset sect_off,
22987 struct dwarf2_per_cu_data *per_cu,
22988 CORE_ADDR (*get_frame_pc) (void *baton),
22991 struct dwarf2_cu *cu;
22992 struct die_info *die;
22993 struct attribute *attr;
22994 struct dwarf2_locexpr_baton retval;
22995 struct objfile *objfile = per_cu->dwarf2_per_objfile->objfile;
22996 struct dwarf2_per_objfile *dwarf2_per_objfile
22997 = get_dwarf2_per_objfile (objfile);
22999 if (per_cu->cu == NULL)
23004 /* We shouldn't get here for a dummy CU, but don't crash on the user.
23005 Instead just throw an error, not much else we can do. */
23006 error (_("Dwarf Error: Dummy CU at %s referenced in module %s"),
23007 sect_offset_str (sect_off), objfile_name (objfile));
23010 die = follow_die_offset (sect_off, per_cu->is_dwz, &cu);
23012 error (_("Dwarf Error: Cannot find DIE at %s referenced in module %s"),
23013 sect_offset_str (sect_off), objfile_name (objfile));
23015 attr = dwarf2_attr (die, DW_AT_location, cu);
23018 /* DWARF: "If there is no such attribute, then there is no effect.".
23019 DATA is ignored if SIZE is 0. */
23021 retval.data = NULL;
23024 else if (attr_form_is_section_offset (attr))
23026 struct dwarf2_loclist_baton loclist_baton;
23027 CORE_ADDR pc = (*get_frame_pc) (baton);
23030 fill_in_loclist_baton (cu, &loclist_baton, attr);
23032 retval.data = dwarf2_find_location_expression (&loclist_baton,
23034 retval.size = size;
23038 if (!attr_form_is_block (attr))
23039 error (_("Dwarf Error: DIE at %s referenced in module %s "
23040 "is neither DW_FORM_block* nor DW_FORM_exprloc"),
23041 sect_offset_str (sect_off), objfile_name (objfile));
23043 retval.data = DW_BLOCK (attr)->data;
23044 retval.size = DW_BLOCK (attr)->size;
23046 retval.per_cu = cu->per_cu;
23048 age_cached_comp_units (dwarf2_per_objfile);
23053 /* Like dwarf2_fetch_die_loc_sect_off, but take a CU
23056 struct dwarf2_locexpr_baton
23057 dwarf2_fetch_die_loc_cu_off (cu_offset offset_in_cu,
23058 struct dwarf2_per_cu_data *per_cu,
23059 CORE_ADDR (*get_frame_pc) (void *baton),
23062 sect_offset sect_off = per_cu->sect_off + to_underlying (offset_in_cu);
23064 return dwarf2_fetch_die_loc_sect_off (sect_off, per_cu, get_frame_pc, baton);
23067 /* Write a constant of a given type as target-ordered bytes into
23070 static const gdb_byte *
23071 write_constant_as_bytes (struct obstack *obstack,
23072 enum bfd_endian byte_order,
23079 *len = TYPE_LENGTH (type);
23080 result = (gdb_byte *) obstack_alloc (obstack, *len);
23081 store_unsigned_integer (result, *len, byte_order, value);
23086 /* If the DIE at OFFSET in PER_CU has a DW_AT_const_value, return a
23087 pointer to the constant bytes and set LEN to the length of the
23088 data. If memory is needed, allocate it on OBSTACK. If the DIE
23089 does not have a DW_AT_const_value, return NULL. */
23092 dwarf2_fetch_constant_bytes (sect_offset sect_off,
23093 struct dwarf2_per_cu_data *per_cu,
23094 struct obstack *obstack,
23097 struct dwarf2_cu *cu;
23098 struct die_info *die;
23099 struct attribute *attr;
23100 const gdb_byte *result = NULL;
23103 enum bfd_endian byte_order;
23104 struct objfile *objfile = per_cu->dwarf2_per_objfile->objfile;
23106 if (per_cu->cu == NULL)
23111 /* We shouldn't get here for a dummy CU, but don't crash on the user.
23112 Instead just throw an error, not much else we can do. */
23113 error (_("Dwarf Error: Dummy CU at %s referenced in module %s"),
23114 sect_offset_str (sect_off), objfile_name (objfile));
23117 die = follow_die_offset (sect_off, per_cu->is_dwz, &cu);
23119 error (_("Dwarf Error: Cannot find DIE at %s referenced in module %s"),
23120 sect_offset_str (sect_off), objfile_name (objfile));
23122 attr = dwarf2_attr (die, DW_AT_const_value, cu);
23126 byte_order = (bfd_big_endian (objfile->obfd)
23127 ? BFD_ENDIAN_BIG : BFD_ENDIAN_LITTLE);
23129 switch (attr->form)
23132 case DW_FORM_GNU_addr_index:
23136 *len = cu->header.addr_size;
23137 tem = (gdb_byte *) obstack_alloc (obstack, *len);
23138 store_unsigned_integer (tem, *len, byte_order, DW_ADDR (attr));
23142 case DW_FORM_string:
23144 case DW_FORM_GNU_str_index:
23145 case DW_FORM_GNU_strp_alt:
23146 /* DW_STRING is already allocated on the objfile obstack, point
23148 result = (const gdb_byte *) DW_STRING (attr);
23149 *len = strlen (DW_STRING (attr));
23151 case DW_FORM_block1:
23152 case DW_FORM_block2:
23153 case DW_FORM_block4:
23154 case DW_FORM_block:
23155 case DW_FORM_exprloc:
23156 case DW_FORM_data16:
23157 result = DW_BLOCK (attr)->data;
23158 *len = DW_BLOCK (attr)->size;
23161 /* The DW_AT_const_value attributes are supposed to carry the
23162 symbol's value "represented as it would be on the target
23163 architecture." By the time we get here, it's already been
23164 converted to host endianness, so we just need to sign- or
23165 zero-extend it as appropriate. */
23166 case DW_FORM_data1:
23167 type = die_type (die, cu);
23168 result = dwarf2_const_value_data (attr, obstack, cu, &value, 8);
23169 if (result == NULL)
23170 result = write_constant_as_bytes (obstack, byte_order,
23173 case DW_FORM_data2:
23174 type = die_type (die, cu);
23175 result = dwarf2_const_value_data (attr, obstack, cu, &value, 16);
23176 if (result == NULL)
23177 result = write_constant_as_bytes (obstack, byte_order,
23180 case DW_FORM_data4:
23181 type = die_type (die, cu);
23182 result = dwarf2_const_value_data (attr, obstack, cu, &value, 32);
23183 if (result == NULL)
23184 result = write_constant_as_bytes (obstack, byte_order,
23187 case DW_FORM_data8:
23188 type = die_type (die, cu);
23189 result = dwarf2_const_value_data (attr, obstack, cu, &value, 64);
23190 if (result == NULL)
23191 result = write_constant_as_bytes (obstack, byte_order,
23195 case DW_FORM_sdata:
23196 case DW_FORM_implicit_const:
23197 type = die_type (die, cu);
23198 result = write_constant_as_bytes (obstack, byte_order,
23199 type, DW_SND (attr), len);
23202 case DW_FORM_udata:
23203 type = die_type (die, cu);
23204 result = write_constant_as_bytes (obstack, byte_order,
23205 type, DW_UNSND (attr), len);
23209 complaint (&symfile_complaints,
23210 _("unsupported const value attribute form: '%s'"),
23211 dwarf_form_name (attr->form));
23218 /* Return the type of the die at OFFSET in PER_CU. Return NULL if no
23219 valid type for this die is found. */
23222 dwarf2_fetch_die_type_sect_off (sect_offset sect_off,
23223 struct dwarf2_per_cu_data *per_cu)
23225 struct dwarf2_cu *cu;
23226 struct die_info *die;
23228 if (per_cu->cu == NULL)
23234 die = follow_die_offset (sect_off, per_cu->is_dwz, &cu);
23238 return die_type (die, cu);
23241 /* Return the type of the DIE at DIE_OFFSET in the CU named by
23245 dwarf2_get_die_type (cu_offset die_offset,
23246 struct dwarf2_per_cu_data *per_cu)
23248 sect_offset die_offset_sect = per_cu->sect_off + to_underlying (die_offset);
23249 return get_die_type_at_offset (die_offset_sect, per_cu);
23252 /* Follow type unit SIG_TYPE referenced by SRC_DIE.
23253 On entry *REF_CU is the CU of SRC_DIE.
23254 On exit *REF_CU is the CU of the result.
23255 Returns NULL if the referenced DIE isn't found. */
23257 static struct die_info *
23258 follow_die_sig_1 (struct die_info *src_die, struct signatured_type *sig_type,
23259 struct dwarf2_cu **ref_cu)
23261 struct die_info temp_die;
23262 struct dwarf2_cu *sig_cu;
23263 struct die_info *die;
23265 /* While it might be nice to assert sig_type->type == NULL here,
23266 we can get here for DW_AT_imported_declaration where we need
23267 the DIE not the type. */
23269 /* If necessary, add it to the queue and load its DIEs. */
23271 if (maybe_queue_comp_unit (*ref_cu, &sig_type->per_cu, language_minimal))
23272 read_signatured_type (sig_type);
23274 sig_cu = sig_type->per_cu.cu;
23275 gdb_assert (sig_cu != NULL);
23276 gdb_assert (to_underlying (sig_type->type_offset_in_section) != 0);
23277 temp_die.sect_off = sig_type->type_offset_in_section;
23278 die = (struct die_info *) htab_find_with_hash (sig_cu->die_hash, &temp_die,
23279 to_underlying (temp_die.sect_off));
23282 struct dwarf2_per_objfile *dwarf2_per_objfile
23283 = (*ref_cu)->per_cu->dwarf2_per_objfile;
23285 /* For .gdb_index version 7 keep track of included TUs.
23286 http://sourceware.org/bugzilla/show_bug.cgi?id=15021. */
23287 if (dwarf2_per_objfile->index_table != NULL
23288 && dwarf2_per_objfile->index_table->version <= 7)
23290 VEC_safe_push (dwarf2_per_cu_ptr,
23291 (*ref_cu)->per_cu->imported_symtabs,
23302 /* Follow signatured type referenced by ATTR in SRC_DIE.
23303 On entry *REF_CU is the CU of SRC_DIE.
23304 On exit *REF_CU is the CU of the result.
23305 The result is the DIE of the type.
23306 If the referenced type cannot be found an error is thrown. */
23308 static struct die_info *
23309 follow_die_sig (struct die_info *src_die, const struct attribute *attr,
23310 struct dwarf2_cu **ref_cu)
23312 ULONGEST signature = DW_SIGNATURE (attr);
23313 struct signatured_type *sig_type;
23314 struct die_info *die;
23316 gdb_assert (attr->form == DW_FORM_ref_sig8);
23318 sig_type = lookup_signatured_type (*ref_cu, signature);
23319 /* sig_type will be NULL if the signatured type is missing from
23321 if (sig_type == NULL)
23323 error (_("Dwarf Error: Cannot find signatured DIE %s referenced"
23324 " from DIE at %s [in module %s]"),
23325 hex_string (signature), sect_offset_str (src_die->sect_off),
23326 objfile_name ((*ref_cu)->per_cu->dwarf2_per_objfile->objfile));
23329 die = follow_die_sig_1 (src_die, sig_type, ref_cu);
23332 dump_die_for_error (src_die);
23333 error (_("Dwarf Error: Problem reading signatured DIE %s referenced"
23334 " from DIE at %s [in module %s]"),
23335 hex_string (signature), sect_offset_str (src_die->sect_off),
23336 objfile_name ((*ref_cu)->per_cu->dwarf2_per_objfile->objfile));
23342 /* Get the type specified by SIGNATURE referenced in DIE/CU,
23343 reading in and processing the type unit if necessary. */
23345 static struct type *
23346 get_signatured_type (struct die_info *die, ULONGEST signature,
23347 struct dwarf2_cu *cu)
23349 struct dwarf2_per_objfile *dwarf2_per_objfile
23350 = cu->per_cu->dwarf2_per_objfile;
23351 struct signatured_type *sig_type;
23352 struct dwarf2_cu *type_cu;
23353 struct die_info *type_die;
23356 sig_type = lookup_signatured_type (cu, signature);
23357 /* sig_type will be NULL if the signatured type is missing from
23359 if (sig_type == NULL)
23361 complaint (&symfile_complaints,
23362 _("Dwarf Error: Cannot find signatured DIE %s referenced"
23363 " from DIE at %s [in module %s]"),
23364 hex_string (signature), sect_offset_str (die->sect_off),
23365 objfile_name (dwarf2_per_objfile->objfile));
23366 return build_error_marker_type (cu, die);
23369 /* If we already know the type we're done. */
23370 if (sig_type->type != NULL)
23371 return sig_type->type;
23374 type_die = follow_die_sig_1 (die, sig_type, &type_cu);
23375 if (type_die != NULL)
23377 /* N.B. We need to call get_die_type to ensure only one type for this DIE
23378 is created. This is important, for example, because for c++ classes
23379 we need TYPE_NAME set which is only done by new_symbol. Blech. */
23380 type = read_type_die (type_die, type_cu);
23383 complaint (&symfile_complaints,
23384 _("Dwarf Error: Cannot build signatured type %s"
23385 " referenced from DIE at %s [in module %s]"),
23386 hex_string (signature), sect_offset_str (die->sect_off),
23387 objfile_name (dwarf2_per_objfile->objfile));
23388 type = build_error_marker_type (cu, die);
23393 complaint (&symfile_complaints,
23394 _("Dwarf Error: Problem reading signatured DIE %s referenced"
23395 " from DIE at %s [in module %s]"),
23396 hex_string (signature), sect_offset_str (die->sect_off),
23397 objfile_name (dwarf2_per_objfile->objfile));
23398 type = build_error_marker_type (cu, die);
23400 sig_type->type = type;
23405 /* Get the type specified by the DW_AT_signature ATTR in DIE/CU,
23406 reading in and processing the type unit if necessary. */
23408 static struct type *
23409 get_DW_AT_signature_type (struct die_info *die, const struct attribute *attr,
23410 struct dwarf2_cu *cu) /* ARI: editCase function */
23412 /* Yes, DW_AT_signature can use a non-ref_sig8 reference. */
23413 if (attr_form_is_ref (attr))
23415 struct dwarf2_cu *type_cu = cu;
23416 struct die_info *type_die = follow_die_ref (die, attr, &type_cu);
23418 return read_type_die (type_die, type_cu);
23420 else if (attr->form == DW_FORM_ref_sig8)
23422 return get_signatured_type (die, DW_SIGNATURE (attr), cu);
23426 struct dwarf2_per_objfile *dwarf2_per_objfile
23427 = cu->per_cu->dwarf2_per_objfile;
23429 complaint (&symfile_complaints,
23430 _("Dwarf Error: DW_AT_signature has bad form %s in DIE"
23431 " at %s [in module %s]"),
23432 dwarf_form_name (attr->form), sect_offset_str (die->sect_off),
23433 objfile_name (dwarf2_per_objfile->objfile));
23434 return build_error_marker_type (cu, die);
23438 /* Load the DIEs associated with type unit PER_CU into memory. */
23441 load_full_type_unit (struct dwarf2_per_cu_data *per_cu)
23443 struct signatured_type *sig_type;
23445 /* Caller is responsible for ensuring type_unit_groups don't get here. */
23446 gdb_assert (! IS_TYPE_UNIT_GROUP (per_cu));
23448 /* We have the per_cu, but we need the signatured_type.
23449 Fortunately this is an easy translation. */
23450 gdb_assert (per_cu->is_debug_types);
23451 sig_type = (struct signatured_type *) per_cu;
23453 gdb_assert (per_cu->cu == NULL);
23455 read_signatured_type (sig_type);
23457 gdb_assert (per_cu->cu != NULL);
23460 /* die_reader_func for read_signatured_type.
23461 This is identical to load_full_comp_unit_reader,
23462 but is kept separate for now. */
23465 read_signatured_type_reader (const struct die_reader_specs *reader,
23466 const gdb_byte *info_ptr,
23467 struct die_info *comp_unit_die,
23471 struct dwarf2_cu *cu = reader->cu;
23473 gdb_assert (cu->die_hash == NULL);
23475 htab_create_alloc_ex (cu->header.length / 12,
23479 &cu->comp_unit_obstack,
23480 hashtab_obstack_allocate,
23481 dummy_obstack_deallocate);
23484 comp_unit_die->child = read_die_and_siblings (reader, info_ptr,
23485 &info_ptr, comp_unit_die);
23486 cu->dies = comp_unit_die;
23487 /* comp_unit_die is not stored in die_hash, no need. */
23489 /* We try not to read any attributes in this function, because not
23490 all CUs needed for references have been loaded yet, and symbol
23491 table processing isn't initialized. But we have to set the CU language,
23492 or we won't be able to build types correctly.
23493 Similarly, if we do not read the producer, we can not apply
23494 producer-specific interpretation. */
23495 prepare_one_comp_unit (cu, cu->dies, language_minimal);
23498 /* Read in a signatured type and build its CU and DIEs.
23499 If the type is a stub for the real type in a DWO file,
23500 read in the real type from the DWO file as well. */
23503 read_signatured_type (struct signatured_type *sig_type)
23505 struct dwarf2_per_cu_data *per_cu = &sig_type->per_cu;
23507 gdb_assert (per_cu->is_debug_types);
23508 gdb_assert (per_cu->cu == NULL);
23510 init_cutu_and_read_dies (per_cu, NULL, 0, 1,
23511 read_signatured_type_reader, NULL);
23512 sig_type->per_cu.tu_read = 1;
23515 /* Decode simple location descriptions.
23516 Given a pointer to a dwarf block that defines a location, compute
23517 the location and return the value.
23519 NOTE drow/2003-11-18: This function is called in two situations
23520 now: for the address of static or global variables (partial symbols
23521 only) and for offsets into structures which are expected to be
23522 (more or less) constant. The partial symbol case should go away,
23523 and only the constant case should remain. That will let this
23524 function complain more accurately. A few special modes are allowed
23525 without complaint for global variables (for instance, global
23526 register values and thread-local values).
23528 A location description containing no operations indicates that the
23529 object is optimized out. The return value is 0 for that case.
23530 FIXME drow/2003-11-16: No callers check for this case any more; soon all
23531 callers will only want a very basic result and this can become a
23534 Note that stack[0] is unused except as a default error return. */
23537 decode_locdesc (struct dwarf_block *blk, struct dwarf2_cu *cu)
23539 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
23541 size_t size = blk->size;
23542 const gdb_byte *data = blk->data;
23543 CORE_ADDR stack[64];
23545 unsigned int bytes_read, unsnd;
23551 stack[++stacki] = 0;
23590 stack[++stacki] = op - DW_OP_lit0;
23625 stack[++stacki] = op - DW_OP_reg0;
23627 dwarf2_complex_location_expr_complaint ();
23631 unsnd = read_unsigned_leb128 (NULL, (data + i), &bytes_read);
23633 stack[++stacki] = unsnd;
23635 dwarf2_complex_location_expr_complaint ();
23639 stack[++stacki] = read_address (objfile->obfd, &data[i],
23644 case DW_OP_const1u:
23645 stack[++stacki] = read_1_byte (objfile->obfd, &data[i]);
23649 case DW_OP_const1s:
23650 stack[++stacki] = read_1_signed_byte (objfile->obfd, &data[i]);
23654 case DW_OP_const2u:
23655 stack[++stacki] = read_2_bytes (objfile->obfd, &data[i]);
23659 case DW_OP_const2s:
23660 stack[++stacki] = read_2_signed_bytes (objfile->obfd, &data[i]);
23664 case DW_OP_const4u:
23665 stack[++stacki] = read_4_bytes (objfile->obfd, &data[i]);
23669 case DW_OP_const4s:
23670 stack[++stacki] = read_4_signed_bytes (objfile->obfd, &data[i]);
23674 case DW_OP_const8u:
23675 stack[++stacki] = read_8_bytes (objfile->obfd, &data[i]);
23680 stack[++stacki] = read_unsigned_leb128 (NULL, (data + i),
23686 stack[++stacki] = read_signed_leb128 (NULL, (data + i), &bytes_read);
23691 stack[stacki + 1] = stack[stacki];
23696 stack[stacki - 1] += stack[stacki];
23700 case DW_OP_plus_uconst:
23701 stack[stacki] += read_unsigned_leb128 (NULL, (data + i),
23707 stack[stacki - 1] -= stack[stacki];
23712 /* If we're not the last op, then we definitely can't encode
23713 this using GDB's address_class enum. This is valid for partial
23714 global symbols, although the variable's address will be bogus
23717 dwarf2_complex_location_expr_complaint ();
23720 case DW_OP_GNU_push_tls_address:
23721 case DW_OP_form_tls_address:
23722 /* The top of the stack has the offset from the beginning
23723 of the thread control block at which the variable is located. */
23724 /* Nothing should follow this operator, so the top of stack would
23726 /* This is valid for partial global symbols, but the variable's
23727 address will be bogus in the psymtab. Make it always at least
23728 non-zero to not look as a variable garbage collected by linker
23729 which have DW_OP_addr 0. */
23731 dwarf2_complex_location_expr_complaint ();
23735 case DW_OP_GNU_uninit:
23738 case DW_OP_GNU_addr_index:
23739 case DW_OP_GNU_const_index:
23740 stack[++stacki] = read_addr_index_from_leb128 (cu, &data[i],
23747 const char *name = get_DW_OP_name (op);
23750 complaint (&symfile_complaints, _("unsupported stack op: '%s'"),
23753 complaint (&symfile_complaints, _("unsupported stack op: '%02x'"),
23757 return (stack[stacki]);
23760 /* Enforce maximum stack depth of SIZE-1 to avoid writing
23761 outside of the allocated space. Also enforce minimum>0. */
23762 if (stacki >= ARRAY_SIZE (stack) - 1)
23764 complaint (&symfile_complaints,
23765 _("location description stack overflow"));
23771 complaint (&symfile_complaints,
23772 _("location description stack underflow"));
23776 return (stack[stacki]);
23779 /* memory allocation interface */
23781 static struct dwarf_block *
23782 dwarf_alloc_block (struct dwarf2_cu *cu)
23784 return XOBNEW (&cu->comp_unit_obstack, struct dwarf_block);
23787 static struct die_info *
23788 dwarf_alloc_die (struct dwarf2_cu *cu, int num_attrs)
23790 struct die_info *die;
23791 size_t size = sizeof (struct die_info);
23794 size += (num_attrs - 1) * sizeof (struct attribute);
23796 die = (struct die_info *) obstack_alloc (&cu->comp_unit_obstack, size);
23797 memset (die, 0, sizeof (struct die_info));
23802 /* Macro support. */
23804 /* Return file name relative to the compilation directory of file number I in
23805 *LH's file name table. The result is allocated using xmalloc; the caller is
23806 responsible for freeing it. */
23809 file_file_name (int file, struct line_header *lh)
23811 /* Is the file number a valid index into the line header's file name
23812 table? Remember that file numbers start with one, not zero. */
23813 if (1 <= file && file <= lh->file_names.size ())
23815 const file_entry &fe = lh->file_names[file - 1];
23817 if (!IS_ABSOLUTE_PATH (fe.name))
23819 const char *dir = fe.include_dir (lh);
23821 return concat (dir, SLASH_STRING, fe.name, (char *) NULL);
23823 return xstrdup (fe.name);
23827 /* The compiler produced a bogus file number. We can at least
23828 record the macro definitions made in the file, even if we
23829 won't be able to find the file by name. */
23830 char fake_name[80];
23832 xsnprintf (fake_name, sizeof (fake_name),
23833 "<bad macro file number %d>", file);
23835 complaint (&symfile_complaints,
23836 _("bad file number in macro information (%d)"),
23839 return xstrdup (fake_name);
23843 /* Return the full name of file number I in *LH's file name table.
23844 Use COMP_DIR as the name of the current directory of the
23845 compilation. The result is allocated using xmalloc; the caller is
23846 responsible for freeing it. */
23848 file_full_name (int file, struct line_header *lh, const char *comp_dir)
23850 /* Is the file number a valid index into the line header's file name
23851 table? Remember that file numbers start with one, not zero. */
23852 if (1 <= file && file <= lh->file_names.size ())
23854 char *relative = file_file_name (file, lh);
23856 if (IS_ABSOLUTE_PATH (relative) || comp_dir == NULL)
23858 return reconcat (relative, comp_dir, SLASH_STRING,
23859 relative, (char *) NULL);
23862 return file_file_name (file, lh);
23866 static struct macro_source_file *
23867 macro_start_file (int file, int line,
23868 struct macro_source_file *current_file,
23869 struct line_header *lh)
23871 /* File name relative to the compilation directory of this source file. */
23872 char *file_name = file_file_name (file, lh);
23874 if (! current_file)
23876 /* Note: We don't create a macro table for this compilation unit
23877 at all until we actually get a filename. */
23878 struct macro_table *macro_table = get_macro_table ();
23880 /* If we have no current file, then this must be the start_file
23881 directive for the compilation unit's main source file. */
23882 current_file = macro_set_main (macro_table, file_name);
23883 macro_define_special (macro_table);
23886 current_file = macro_include (current_file, line, file_name);
23890 return current_file;
23893 static const char *
23894 consume_improper_spaces (const char *p, const char *body)
23898 complaint (&symfile_complaints,
23899 _("macro definition contains spaces "
23900 "in formal argument list:\n`%s'"),
23912 parse_macro_definition (struct macro_source_file *file, int line,
23917 /* The body string takes one of two forms. For object-like macro
23918 definitions, it should be:
23920 <macro name> " " <definition>
23922 For function-like macro definitions, it should be:
23924 <macro name> "() " <definition>
23926 <macro name> "(" <arg name> ( "," <arg name> ) * ") " <definition>
23928 Spaces may appear only where explicitly indicated, and in the
23931 The Dwarf 2 spec says that an object-like macro's name is always
23932 followed by a space, but versions of GCC around March 2002 omit
23933 the space when the macro's definition is the empty string.
23935 The Dwarf 2 spec says that there should be no spaces between the
23936 formal arguments in a function-like macro's formal argument list,
23937 but versions of GCC around March 2002 include spaces after the
23941 /* Find the extent of the macro name. The macro name is terminated
23942 by either a space or null character (for an object-like macro) or
23943 an opening paren (for a function-like macro). */
23944 for (p = body; *p; p++)
23945 if (*p == ' ' || *p == '(')
23948 if (*p == ' ' || *p == '\0')
23950 /* It's an object-like macro. */
23951 int name_len = p - body;
23952 char *name = savestring (body, name_len);
23953 const char *replacement;
23956 replacement = body + name_len + 1;
23959 dwarf2_macro_malformed_definition_complaint (body);
23960 replacement = body + name_len;
23963 macro_define_object (file, line, name, replacement);
23967 else if (*p == '(')
23969 /* It's a function-like macro. */
23970 char *name = savestring (body, p - body);
23973 char **argv = XNEWVEC (char *, argv_size);
23977 p = consume_improper_spaces (p, body);
23979 /* Parse the formal argument list. */
23980 while (*p && *p != ')')
23982 /* Find the extent of the current argument name. */
23983 const char *arg_start = p;
23985 while (*p && *p != ',' && *p != ')' && *p != ' ')
23988 if (! *p || p == arg_start)
23989 dwarf2_macro_malformed_definition_complaint (body);
23992 /* Make sure argv has room for the new argument. */
23993 if (argc >= argv_size)
23996 argv = XRESIZEVEC (char *, argv, argv_size);
23999 argv[argc++] = savestring (arg_start, p - arg_start);
24002 p = consume_improper_spaces (p, body);
24004 /* Consume the comma, if present. */
24009 p = consume_improper_spaces (p, body);
24018 /* Perfectly formed definition, no complaints. */
24019 macro_define_function (file, line, name,
24020 argc, (const char **) argv,
24022 else if (*p == '\0')
24024 /* Complain, but do define it. */
24025 dwarf2_macro_malformed_definition_complaint (body);
24026 macro_define_function (file, line, name,
24027 argc, (const char **) argv,
24031 /* Just complain. */
24032 dwarf2_macro_malformed_definition_complaint (body);
24035 /* Just complain. */
24036 dwarf2_macro_malformed_definition_complaint (body);
24042 for (i = 0; i < argc; i++)
24048 dwarf2_macro_malformed_definition_complaint (body);
24051 /* Skip some bytes from BYTES according to the form given in FORM.
24052 Returns the new pointer. */
24054 static const gdb_byte *
24055 skip_form_bytes (bfd *abfd, const gdb_byte *bytes, const gdb_byte *buffer_end,
24056 enum dwarf_form form,
24057 unsigned int offset_size,
24058 struct dwarf2_section_info *section)
24060 unsigned int bytes_read;
24064 case DW_FORM_data1:
24069 case DW_FORM_data2:
24073 case DW_FORM_data4:
24077 case DW_FORM_data8:
24081 case DW_FORM_data16:
24085 case DW_FORM_string:
24086 read_direct_string (abfd, bytes, &bytes_read);
24087 bytes += bytes_read;
24090 case DW_FORM_sec_offset:
24092 case DW_FORM_GNU_strp_alt:
24093 bytes += offset_size;
24096 case DW_FORM_block:
24097 bytes += read_unsigned_leb128 (abfd, bytes, &bytes_read);
24098 bytes += bytes_read;
24101 case DW_FORM_block1:
24102 bytes += 1 + read_1_byte (abfd, bytes);
24104 case DW_FORM_block2:
24105 bytes += 2 + read_2_bytes (abfd, bytes);
24107 case DW_FORM_block4:
24108 bytes += 4 + read_4_bytes (abfd, bytes);
24111 case DW_FORM_sdata:
24112 case DW_FORM_udata:
24113 case DW_FORM_GNU_addr_index:
24114 case DW_FORM_GNU_str_index:
24115 bytes = gdb_skip_leb128 (bytes, buffer_end);
24118 dwarf2_section_buffer_overflow_complaint (section);
24123 case DW_FORM_implicit_const:
24128 complaint (&symfile_complaints,
24129 _("invalid form 0x%x in `%s'"),
24130 form, get_section_name (section));
24138 /* A helper for dwarf_decode_macros that handles skipping an unknown
24139 opcode. Returns an updated pointer to the macro data buffer; or,
24140 on error, issues a complaint and returns NULL. */
24142 static const gdb_byte *
24143 skip_unknown_opcode (unsigned int opcode,
24144 const gdb_byte **opcode_definitions,
24145 const gdb_byte *mac_ptr, const gdb_byte *mac_end,
24147 unsigned int offset_size,
24148 struct dwarf2_section_info *section)
24150 unsigned int bytes_read, i;
24152 const gdb_byte *defn;
24154 if (opcode_definitions[opcode] == NULL)
24156 complaint (&symfile_complaints,
24157 _("unrecognized DW_MACFINO opcode 0x%x"),
24162 defn = opcode_definitions[opcode];
24163 arg = read_unsigned_leb128 (abfd, defn, &bytes_read);
24164 defn += bytes_read;
24166 for (i = 0; i < arg; ++i)
24168 mac_ptr = skip_form_bytes (abfd, mac_ptr, mac_end,
24169 (enum dwarf_form) defn[i], offset_size,
24171 if (mac_ptr == NULL)
24173 /* skip_form_bytes already issued the complaint. */
24181 /* A helper function which parses the header of a macro section.
24182 If the macro section is the extended (for now called "GNU") type,
24183 then this updates *OFFSET_SIZE. Returns a pointer to just after
24184 the header, or issues a complaint and returns NULL on error. */
24186 static const gdb_byte *
24187 dwarf_parse_macro_header (const gdb_byte **opcode_definitions,
24189 const gdb_byte *mac_ptr,
24190 unsigned int *offset_size,
24191 int section_is_gnu)
24193 memset (opcode_definitions, 0, 256 * sizeof (gdb_byte *));
24195 if (section_is_gnu)
24197 unsigned int version, flags;
24199 version = read_2_bytes (abfd, mac_ptr);
24200 if (version != 4 && version != 5)
24202 complaint (&symfile_complaints,
24203 _("unrecognized version `%d' in .debug_macro section"),
24209 flags = read_1_byte (abfd, mac_ptr);
24211 *offset_size = (flags & 1) ? 8 : 4;
24213 if ((flags & 2) != 0)
24214 /* We don't need the line table offset. */
24215 mac_ptr += *offset_size;
24217 /* Vendor opcode descriptions. */
24218 if ((flags & 4) != 0)
24220 unsigned int i, count;
24222 count = read_1_byte (abfd, mac_ptr);
24224 for (i = 0; i < count; ++i)
24226 unsigned int opcode, bytes_read;
24229 opcode = read_1_byte (abfd, mac_ptr);
24231 opcode_definitions[opcode] = mac_ptr;
24232 arg = read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
24233 mac_ptr += bytes_read;
24242 /* A helper for dwarf_decode_macros that handles the GNU extensions,
24243 including DW_MACRO_import. */
24246 dwarf_decode_macro_bytes (struct dwarf2_per_objfile *dwarf2_per_objfile,
24248 const gdb_byte *mac_ptr, const gdb_byte *mac_end,
24249 struct macro_source_file *current_file,
24250 struct line_header *lh,
24251 struct dwarf2_section_info *section,
24252 int section_is_gnu, int section_is_dwz,
24253 unsigned int offset_size,
24254 htab_t include_hash)
24256 struct objfile *objfile = dwarf2_per_objfile->objfile;
24257 enum dwarf_macro_record_type macinfo_type;
24258 int at_commandline;
24259 const gdb_byte *opcode_definitions[256];
24261 mac_ptr = dwarf_parse_macro_header (opcode_definitions, abfd, mac_ptr,
24262 &offset_size, section_is_gnu);
24263 if (mac_ptr == NULL)
24265 /* We already issued a complaint. */
24269 /* Determines if GDB is still before first DW_MACINFO_start_file. If true
24270 GDB is still reading the definitions from command line. First
24271 DW_MACINFO_start_file will need to be ignored as it was already executed
24272 to create CURRENT_FILE for the main source holding also the command line
24273 definitions. On first met DW_MACINFO_start_file this flag is reset to
24274 normally execute all the remaining DW_MACINFO_start_file macinfos. */
24276 at_commandline = 1;
24280 /* Do we at least have room for a macinfo type byte? */
24281 if (mac_ptr >= mac_end)
24283 dwarf2_section_buffer_overflow_complaint (section);
24287 macinfo_type = (enum dwarf_macro_record_type) read_1_byte (abfd, mac_ptr);
24290 /* Note that we rely on the fact that the corresponding GNU and
24291 DWARF constants are the same. */
24293 DIAGNOSTIC_IGNORE_SWITCH_DIFFERENT_ENUM_TYPES
24294 switch (macinfo_type)
24296 /* A zero macinfo type indicates the end of the macro
24301 case DW_MACRO_define:
24302 case DW_MACRO_undef:
24303 case DW_MACRO_define_strp:
24304 case DW_MACRO_undef_strp:
24305 case DW_MACRO_define_sup:
24306 case DW_MACRO_undef_sup:
24308 unsigned int bytes_read;
24313 line = read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
24314 mac_ptr += bytes_read;
24316 if (macinfo_type == DW_MACRO_define
24317 || macinfo_type == DW_MACRO_undef)
24319 body = read_direct_string (abfd, mac_ptr, &bytes_read);
24320 mac_ptr += bytes_read;
24324 LONGEST str_offset;
24326 str_offset = read_offset_1 (abfd, mac_ptr, offset_size);
24327 mac_ptr += offset_size;
24329 if (macinfo_type == DW_MACRO_define_sup
24330 || macinfo_type == DW_MACRO_undef_sup
24333 struct dwz_file *dwz
24334 = dwarf2_get_dwz_file (dwarf2_per_objfile);
24336 body = read_indirect_string_from_dwz (objfile,
24340 body = read_indirect_string_at_offset (dwarf2_per_objfile,
24344 is_define = (macinfo_type == DW_MACRO_define
24345 || macinfo_type == DW_MACRO_define_strp
24346 || macinfo_type == DW_MACRO_define_sup);
24347 if (! current_file)
24349 /* DWARF violation as no main source is present. */
24350 complaint (&symfile_complaints,
24351 _("debug info with no main source gives macro %s "
24353 is_define ? _("definition") : _("undefinition"),
24357 if ((line == 0 && !at_commandline)
24358 || (line != 0 && at_commandline))
24359 complaint (&symfile_complaints,
24360 _("debug info gives %s macro %s with %s line %d: %s"),
24361 at_commandline ? _("command-line") : _("in-file"),
24362 is_define ? _("definition") : _("undefinition"),
24363 line == 0 ? _("zero") : _("non-zero"), line, body);
24366 parse_macro_definition (current_file, line, body);
24369 gdb_assert (macinfo_type == DW_MACRO_undef
24370 || macinfo_type == DW_MACRO_undef_strp
24371 || macinfo_type == DW_MACRO_undef_sup);
24372 macro_undef (current_file, line, body);
24377 case DW_MACRO_start_file:
24379 unsigned int bytes_read;
24382 line = read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
24383 mac_ptr += bytes_read;
24384 file = read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
24385 mac_ptr += bytes_read;
24387 if ((line == 0 && !at_commandline)
24388 || (line != 0 && at_commandline))
24389 complaint (&symfile_complaints,
24390 _("debug info gives source %d included "
24391 "from %s at %s line %d"),
24392 file, at_commandline ? _("command-line") : _("file"),
24393 line == 0 ? _("zero") : _("non-zero"), line);
24395 if (at_commandline)
24397 /* This DW_MACRO_start_file was executed in the
24399 at_commandline = 0;
24402 current_file = macro_start_file (file, line, current_file, lh);
24406 case DW_MACRO_end_file:
24407 if (! current_file)
24408 complaint (&symfile_complaints,
24409 _("macro debug info has an unmatched "
24410 "`close_file' directive"));
24413 current_file = current_file->included_by;
24414 if (! current_file)
24416 enum dwarf_macro_record_type next_type;
24418 /* GCC circa March 2002 doesn't produce the zero
24419 type byte marking the end of the compilation
24420 unit. Complain if it's not there, but exit no
24423 /* Do we at least have room for a macinfo type byte? */
24424 if (mac_ptr >= mac_end)
24426 dwarf2_section_buffer_overflow_complaint (section);
24430 /* We don't increment mac_ptr here, so this is just
24433 = (enum dwarf_macro_record_type) read_1_byte (abfd,
24435 if (next_type != 0)
24436 complaint (&symfile_complaints,
24437 _("no terminating 0-type entry for "
24438 "macros in `.debug_macinfo' section"));
24445 case DW_MACRO_import:
24446 case DW_MACRO_import_sup:
24450 bfd *include_bfd = abfd;
24451 struct dwarf2_section_info *include_section = section;
24452 const gdb_byte *include_mac_end = mac_end;
24453 int is_dwz = section_is_dwz;
24454 const gdb_byte *new_mac_ptr;
24456 offset = read_offset_1 (abfd, mac_ptr, offset_size);
24457 mac_ptr += offset_size;
24459 if (macinfo_type == DW_MACRO_import_sup)
24461 struct dwz_file *dwz = dwarf2_get_dwz_file (dwarf2_per_objfile);
24463 dwarf2_read_section (objfile, &dwz->macro);
24465 include_section = &dwz->macro;
24466 include_bfd = get_section_bfd_owner (include_section);
24467 include_mac_end = dwz->macro.buffer + dwz->macro.size;
24471 new_mac_ptr = include_section->buffer + offset;
24472 slot = htab_find_slot (include_hash, new_mac_ptr, INSERT);
24476 /* This has actually happened; see
24477 http://sourceware.org/bugzilla/show_bug.cgi?id=13568. */
24478 complaint (&symfile_complaints,
24479 _("recursive DW_MACRO_import in "
24480 ".debug_macro section"));
24484 *slot = (void *) new_mac_ptr;
24486 dwarf_decode_macro_bytes (dwarf2_per_objfile,
24487 include_bfd, new_mac_ptr,
24488 include_mac_end, current_file, lh,
24489 section, section_is_gnu, is_dwz,
24490 offset_size, include_hash);
24492 htab_remove_elt (include_hash, (void *) new_mac_ptr);
24497 case DW_MACINFO_vendor_ext:
24498 if (!section_is_gnu)
24500 unsigned int bytes_read;
24502 /* This reads the constant, but since we don't recognize
24503 any vendor extensions, we ignore it. */
24504 read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
24505 mac_ptr += bytes_read;
24506 read_direct_string (abfd, mac_ptr, &bytes_read);
24507 mac_ptr += bytes_read;
24509 /* We don't recognize any vendor extensions. */
24515 mac_ptr = skip_unknown_opcode (macinfo_type, opcode_definitions,
24516 mac_ptr, mac_end, abfd, offset_size,
24518 if (mac_ptr == NULL)
24523 } while (macinfo_type != 0);
24527 dwarf_decode_macros (struct dwarf2_cu *cu, unsigned int offset,
24528 int section_is_gnu)
24530 struct dwarf2_per_objfile *dwarf2_per_objfile
24531 = cu->per_cu->dwarf2_per_objfile;
24532 struct objfile *objfile = dwarf2_per_objfile->objfile;
24533 struct line_header *lh = cu->line_header;
24535 const gdb_byte *mac_ptr, *mac_end;
24536 struct macro_source_file *current_file = 0;
24537 enum dwarf_macro_record_type macinfo_type;
24538 unsigned int offset_size = cu->header.offset_size;
24539 const gdb_byte *opcode_definitions[256];
24541 struct dwarf2_section_info *section;
24542 const char *section_name;
24544 if (cu->dwo_unit != NULL)
24546 if (section_is_gnu)
24548 section = &cu->dwo_unit->dwo_file->sections.macro;
24549 section_name = ".debug_macro.dwo";
24553 section = &cu->dwo_unit->dwo_file->sections.macinfo;
24554 section_name = ".debug_macinfo.dwo";
24559 if (section_is_gnu)
24561 section = &dwarf2_per_objfile->macro;
24562 section_name = ".debug_macro";
24566 section = &dwarf2_per_objfile->macinfo;
24567 section_name = ".debug_macinfo";
24571 dwarf2_read_section (objfile, section);
24572 if (section->buffer == NULL)
24574 complaint (&symfile_complaints, _("missing %s section"), section_name);
24577 abfd = get_section_bfd_owner (section);
24579 /* First pass: Find the name of the base filename.
24580 This filename is needed in order to process all macros whose definition
24581 (or undefinition) comes from the command line. These macros are defined
24582 before the first DW_MACINFO_start_file entry, and yet still need to be
24583 associated to the base file.
24585 To determine the base file name, we scan the macro definitions until we
24586 reach the first DW_MACINFO_start_file entry. We then initialize
24587 CURRENT_FILE accordingly so that any macro definition found before the
24588 first DW_MACINFO_start_file can still be associated to the base file. */
24590 mac_ptr = section->buffer + offset;
24591 mac_end = section->buffer + section->size;
24593 mac_ptr = dwarf_parse_macro_header (opcode_definitions, abfd, mac_ptr,
24594 &offset_size, section_is_gnu);
24595 if (mac_ptr == NULL)
24597 /* We already issued a complaint. */
24603 /* Do we at least have room for a macinfo type byte? */
24604 if (mac_ptr >= mac_end)
24606 /* Complaint is printed during the second pass as GDB will probably
24607 stop the first pass earlier upon finding
24608 DW_MACINFO_start_file. */
24612 macinfo_type = (enum dwarf_macro_record_type) read_1_byte (abfd, mac_ptr);
24615 /* Note that we rely on the fact that the corresponding GNU and
24616 DWARF constants are the same. */
24618 DIAGNOSTIC_IGNORE_SWITCH_DIFFERENT_ENUM_TYPES
24619 switch (macinfo_type)
24621 /* A zero macinfo type indicates the end of the macro
24626 case DW_MACRO_define:
24627 case DW_MACRO_undef:
24628 /* Only skip the data by MAC_PTR. */
24630 unsigned int bytes_read;
24632 read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
24633 mac_ptr += bytes_read;
24634 read_direct_string (abfd, mac_ptr, &bytes_read);
24635 mac_ptr += bytes_read;
24639 case DW_MACRO_start_file:
24641 unsigned int bytes_read;
24644 line = read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
24645 mac_ptr += bytes_read;
24646 file = read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
24647 mac_ptr += bytes_read;
24649 current_file = macro_start_file (file, line, current_file, lh);
24653 case DW_MACRO_end_file:
24654 /* No data to skip by MAC_PTR. */
24657 case DW_MACRO_define_strp:
24658 case DW_MACRO_undef_strp:
24659 case DW_MACRO_define_sup:
24660 case DW_MACRO_undef_sup:
24662 unsigned int bytes_read;
24664 read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
24665 mac_ptr += bytes_read;
24666 mac_ptr += offset_size;
24670 case DW_MACRO_import:
24671 case DW_MACRO_import_sup:
24672 /* Note that, according to the spec, a transparent include
24673 chain cannot call DW_MACRO_start_file. So, we can just
24674 skip this opcode. */
24675 mac_ptr += offset_size;
24678 case DW_MACINFO_vendor_ext:
24679 /* Only skip the data by MAC_PTR. */
24680 if (!section_is_gnu)
24682 unsigned int bytes_read;
24684 read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
24685 mac_ptr += bytes_read;
24686 read_direct_string (abfd, mac_ptr, &bytes_read);
24687 mac_ptr += bytes_read;
24692 mac_ptr = skip_unknown_opcode (macinfo_type, opcode_definitions,
24693 mac_ptr, mac_end, abfd, offset_size,
24695 if (mac_ptr == NULL)
24700 } while (macinfo_type != 0 && current_file == NULL);
24702 /* Second pass: Process all entries.
24704 Use the AT_COMMAND_LINE flag to determine whether we are still processing
24705 command-line macro definitions/undefinitions. This flag is unset when we
24706 reach the first DW_MACINFO_start_file entry. */
24708 htab_up include_hash (htab_create_alloc (1, htab_hash_pointer,
24710 NULL, xcalloc, xfree));
24711 mac_ptr = section->buffer + offset;
24712 slot = htab_find_slot (include_hash.get (), mac_ptr, INSERT);
24713 *slot = (void *) mac_ptr;
24714 dwarf_decode_macro_bytes (dwarf2_per_objfile,
24715 abfd, mac_ptr, mac_end,
24716 current_file, lh, section,
24717 section_is_gnu, 0, offset_size,
24718 include_hash.get ());
24721 /* Check if the attribute's form is a DW_FORM_block*
24722 if so return true else false. */
24725 attr_form_is_block (const struct attribute *attr)
24727 return (attr == NULL ? 0 :
24728 attr->form == DW_FORM_block1
24729 || attr->form == DW_FORM_block2
24730 || attr->form == DW_FORM_block4
24731 || attr->form == DW_FORM_block
24732 || attr->form == DW_FORM_exprloc);
24735 /* Return non-zero if ATTR's value is a section offset --- classes
24736 lineptr, loclistptr, macptr or rangelistptr --- or zero, otherwise.
24737 You may use DW_UNSND (attr) to retrieve such offsets.
24739 Section 7.5.4, "Attribute Encodings", explains that no attribute
24740 may have a value that belongs to more than one of these classes; it
24741 would be ambiguous if we did, because we use the same forms for all
24745 attr_form_is_section_offset (const struct attribute *attr)
24747 return (attr->form == DW_FORM_data4
24748 || attr->form == DW_FORM_data8
24749 || attr->form == DW_FORM_sec_offset);
24752 /* Return non-zero if ATTR's value falls in the 'constant' class, or
24753 zero otherwise. When this function returns true, you can apply
24754 dwarf2_get_attr_constant_value to it.
24756 However, note that for some attributes you must check
24757 attr_form_is_section_offset before using this test. DW_FORM_data4
24758 and DW_FORM_data8 are members of both the constant class, and of
24759 the classes that contain offsets into other debug sections
24760 (lineptr, loclistptr, macptr or rangelistptr). The DWARF spec says
24761 that, if an attribute's can be either a constant or one of the
24762 section offset classes, DW_FORM_data4 and DW_FORM_data8 should be
24763 taken as section offsets, not constants.
24765 DW_FORM_data16 is not considered as dwarf2_get_attr_constant_value
24766 cannot handle that. */
24769 attr_form_is_constant (const struct attribute *attr)
24771 switch (attr->form)
24773 case DW_FORM_sdata:
24774 case DW_FORM_udata:
24775 case DW_FORM_data1:
24776 case DW_FORM_data2:
24777 case DW_FORM_data4:
24778 case DW_FORM_data8:
24779 case DW_FORM_implicit_const:
24787 /* DW_ADDR is always stored already as sect_offset; despite for the forms
24788 besides DW_FORM_ref_addr it is stored as cu_offset in the DWARF file. */
24791 attr_form_is_ref (const struct attribute *attr)
24793 switch (attr->form)
24795 case DW_FORM_ref_addr:
24800 case DW_FORM_ref_udata:
24801 case DW_FORM_GNU_ref_alt:
24808 /* Return the .debug_loc section to use for CU.
24809 For DWO files use .debug_loc.dwo. */
24811 static struct dwarf2_section_info *
24812 cu_debug_loc_section (struct dwarf2_cu *cu)
24814 struct dwarf2_per_objfile *dwarf2_per_objfile
24815 = cu->per_cu->dwarf2_per_objfile;
24819 struct dwo_sections *sections = &cu->dwo_unit->dwo_file->sections;
24821 return cu->header.version >= 5 ? §ions->loclists : §ions->loc;
24823 return (cu->header.version >= 5 ? &dwarf2_per_objfile->loclists
24824 : &dwarf2_per_objfile->loc);
24827 /* A helper function that fills in a dwarf2_loclist_baton. */
24830 fill_in_loclist_baton (struct dwarf2_cu *cu,
24831 struct dwarf2_loclist_baton *baton,
24832 const struct attribute *attr)
24834 struct dwarf2_per_objfile *dwarf2_per_objfile
24835 = cu->per_cu->dwarf2_per_objfile;
24836 struct dwarf2_section_info *section = cu_debug_loc_section (cu);
24838 dwarf2_read_section (dwarf2_per_objfile->objfile, section);
24840 baton->per_cu = cu->per_cu;
24841 gdb_assert (baton->per_cu);
24842 /* We don't know how long the location list is, but make sure we
24843 don't run off the edge of the section. */
24844 baton->size = section->size - DW_UNSND (attr);
24845 baton->data = section->buffer + DW_UNSND (attr);
24846 baton->base_address = cu->base_address;
24847 baton->from_dwo = cu->dwo_unit != NULL;
24851 dwarf2_symbol_mark_computed (const struct attribute *attr, struct symbol *sym,
24852 struct dwarf2_cu *cu, int is_block)
24854 struct dwarf2_per_objfile *dwarf2_per_objfile
24855 = cu->per_cu->dwarf2_per_objfile;
24856 struct objfile *objfile = dwarf2_per_objfile->objfile;
24857 struct dwarf2_section_info *section = cu_debug_loc_section (cu);
24859 if (attr_form_is_section_offset (attr)
24860 /* .debug_loc{,.dwo} may not exist at all, or the offset may be outside
24861 the section. If so, fall through to the complaint in the
24863 && DW_UNSND (attr) < dwarf2_section_size (objfile, section))
24865 struct dwarf2_loclist_baton *baton;
24867 baton = XOBNEW (&objfile->objfile_obstack, struct dwarf2_loclist_baton);
24869 fill_in_loclist_baton (cu, baton, attr);
24871 if (cu->base_known == 0)
24872 complaint (&symfile_complaints,
24873 _("Location list used without "
24874 "specifying the CU base address."));
24876 SYMBOL_ACLASS_INDEX (sym) = (is_block
24877 ? dwarf2_loclist_block_index
24878 : dwarf2_loclist_index);
24879 SYMBOL_LOCATION_BATON (sym) = baton;
24883 struct dwarf2_locexpr_baton *baton;
24885 baton = XOBNEW (&objfile->objfile_obstack, struct dwarf2_locexpr_baton);
24886 baton->per_cu = cu->per_cu;
24887 gdb_assert (baton->per_cu);
24889 if (attr_form_is_block (attr))
24891 /* Note that we're just copying the block's data pointer
24892 here, not the actual data. We're still pointing into the
24893 info_buffer for SYM's objfile; right now we never release
24894 that buffer, but when we do clean up properly this may
24896 baton->size = DW_BLOCK (attr)->size;
24897 baton->data = DW_BLOCK (attr)->data;
24901 dwarf2_invalid_attrib_class_complaint ("location description",
24902 SYMBOL_NATURAL_NAME (sym));
24906 SYMBOL_ACLASS_INDEX (sym) = (is_block
24907 ? dwarf2_locexpr_block_index
24908 : dwarf2_locexpr_index);
24909 SYMBOL_LOCATION_BATON (sym) = baton;
24913 /* Return the OBJFILE associated with the compilation unit CU. If CU
24914 came from a separate debuginfo file, then the master objfile is
24918 dwarf2_per_cu_objfile (struct dwarf2_per_cu_data *per_cu)
24920 struct objfile *objfile = per_cu->dwarf2_per_objfile->objfile;
24922 /* Return the master objfile, so that we can report and look up the
24923 correct file containing this variable. */
24924 if (objfile->separate_debug_objfile_backlink)
24925 objfile = objfile->separate_debug_objfile_backlink;
24930 /* Return comp_unit_head for PER_CU, either already available in PER_CU->CU
24931 (CU_HEADERP is unused in such case) or prepare a temporary copy at
24932 CU_HEADERP first. */
24934 static const struct comp_unit_head *
24935 per_cu_header_read_in (struct comp_unit_head *cu_headerp,
24936 struct dwarf2_per_cu_data *per_cu)
24938 const gdb_byte *info_ptr;
24941 return &per_cu->cu->header;
24943 info_ptr = per_cu->section->buffer + to_underlying (per_cu->sect_off);
24945 memset (cu_headerp, 0, sizeof (*cu_headerp));
24946 read_comp_unit_head (cu_headerp, info_ptr, per_cu->section,
24947 rcuh_kind::COMPILE);
24952 /* Return the address size given in the compilation unit header for CU. */
24955 dwarf2_per_cu_addr_size (struct dwarf2_per_cu_data *per_cu)
24957 struct comp_unit_head cu_header_local;
24958 const struct comp_unit_head *cu_headerp;
24960 cu_headerp = per_cu_header_read_in (&cu_header_local, per_cu);
24962 return cu_headerp->addr_size;
24965 /* Return the offset size given in the compilation unit header for CU. */
24968 dwarf2_per_cu_offset_size (struct dwarf2_per_cu_data *per_cu)
24970 struct comp_unit_head cu_header_local;
24971 const struct comp_unit_head *cu_headerp;
24973 cu_headerp = per_cu_header_read_in (&cu_header_local, per_cu);
24975 return cu_headerp->offset_size;
24978 /* See its dwarf2loc.h declaration. */
24981 dwarf2_per_cu_ref_addr_size (struct dwarf2_per_cu_data *per_cu)
24983 struct comp_unit_head cu_header_local;
24984 const struct comp_unit_head *cu_headerp;
24986 cu_headerp = per_cu_header_read_in (&cu_header_local, per_cu);
24988 if (cu_headerp->version == 2)
24989 return cu_headerp->addr_size;
24991 return cu_headerp->offset_size;
24994 /* Return the text offset of the CU. The returned offset comes from
24995 this CU's objfile. If this objfile came from a separate debuginfo
24996 file, then the offset may be different from the corresponding
24997 offset in the parent objfile. */
25000 dwarf2_per_cu_text_offset (struct dwarf2_per_cu_data *per_cu)
25002 struct objfile *objfile = per_cu->dwarf2_per_objfile->objfile;
25004 return ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
25007 /* Return DWARF version number of PER_CU. */
25010 dwarf2_version (struct dwarf2_per_cu_data *per_cu)
25012 return per_cu->dwarf_version;
25015 /* Locate the .debug_info compilation unit from CU's objfile which contains
25016 the DIE at OFFSET. Raises an error on failure. */
25018 static struct dwarf2_per_cu_data *
25019 dwarf2_find_containing_comp_unit (sect_offset sect_off,
25020 unsigned int offset_in_dwz,
25021 struct dwarf2_per_objfile *dwarf2_per_objfile)
25023 struct dwarf2_per_cu_data *this_cu;
25025 const sect_offset *cu_off;
25028 high = dwarf2_per_objfile->n_comp_units - 1;
25031 struct dwarf2_per_cu_data *mid_cu;
25032 int mid = low + (high - low) / 2;
25034 mid_cu = dwarf2_per_objfile->all_comp_units[mid];
25035 cu_off = &mid_cu->sect_off;
25036 if (mid_cu->is_dwz > offset_in_dwz
25037 || (mid_cu->is_dwz == offset_in_dwz && *cu_off >= sect_off))
25042 gdb_assert (low == high);
25043 this_cu = dwarf2_per_objfile->all_comp_units[low];
25044 cu_off = &this_cu->sect_off;
25045 if (this_cu->is_dwz != offset_in_dwz || *cu_off > sect_off)
25047 if (low == 0 || this_cu->is_dwz != offset_in_dwz)
25048 error (_("Dwarf Error: could not find partial DIE containing "
25049 "offset %s [in module %s]"),
25050 sect_offset_str (sect_off),
25051 bfd_get_filename (dwarf2_per_objfile->objfile->obfd));
25053 gdb_assert (dwarf2_per_objfile->all_comp_units[low-1]->sect_off
25055 return dwarf2_per_objfile->all_comp_units[low-1];
25059 this_cu = dwarf2_per_objfile->all_comp_units[low];
25060 if (low == dwarf2_per_objfile->n_comp_units - 1
25061 && sect_off >= this_cu->sect_off + this_cu->length)
25062 error (_("invalid dwarf2 offset %s"), sect_offset_str (sect_off));
25063 gdb_assert (sect_off < this_cu->sect_off + this_cu->length);
25068 /* Initialize dwarf2_cu CU, owned by PER_CU. */
25070 dwarf2_cu::dwarf2_cu (struct dwarf2_per_cu_data *per_cu_)
25071 : per_cu (per_cu_),
25074 checked_producer (0),
25075 producer_is_gxx_lt_4_6 (0),
25076 producer_is_gcc_lt_4_3 (0),
25077 producer_is_icc_lt_14 (0),
25078 processing_has_namespace_info (0)
25083 /* Destroy a dwarf2_cu. */
25085 dwarf2_cu::~dwarf2_cu ()
25090 /* Initialize basic fields of dwarf_cu CU according to DIE COMP_UNIT_DIE. */
25093 prepare_one_comp_unit (struct dwarf2_cu *cu, struct die_info *comp_unit_die,
25094 enum language pretend_language)
25096 struct attribute *attr;
25098 /* Set the language we're debugging. */
25099 attr = dwarf2_attr (comp_unit_die, DW_AT_language, cu);
25101 set_cu_language (DW_UNSND (attr), cu);
25104 cu->language = pretend_language;
25105 cu->language_defn = language_def (cu->language);
25108 cu->producer = dwarf2_string_attr (comp_unit_die, DW_AT_producer, cu);
25111 /* Free all cached compilation units. */
25114 free_cached_comp_units (void *data)
25116 struct dwarf2_per_objfile *dwarf2_per_objfile
25117 = (struct dwarf2_per_objfile *) data;
25119 dwarf2_per_objfile->free_cached_comp_units ();
25122 /* Increase the age counter on each cached compilation unit, and free
25123 any that are too old. */
25126 age_cached_comp_units (struct dwarf2_per_objfile *dwarf2_per_objfile)
25128 struct dwarf2_per_cu_data *per_cu, **last_chain;
25130 dwarf2_clear_marks (dwarf2_per_objfile->read_in_chain);
25131 per_cu = dwarf2_per_objfile->read_in_chain;
25132 while (per_cu != NULL)
25134 per_cu->cu->last_used ++;
25135 if (per_cu->cu->last_used <= dwarf_max_cache_age)
25136 dwarf2_mark (per_cu->cu);
25137 per_cu = per_cu->cu->read_in_chain;
25140 per_cu = dwarf2_per_objfile->read_in_chain;
25141 last_chain = &dwarf2_per_objfile->read_in_chain;
25142 while (per_cu != NULL)
25144 struct dwarf2_per_cu_data *next_cu;
25146 next_cu = per_cu->cu->read_in_chain;
25148 if (!per_cu->cu->mark)
25151 *last_chain = next_cu;
25154 last_chain = &per_cu->cu->read_in_chain;
25160 /* Remove a single compilation unit from the cache. */
25163 free_one_cached_comp_unit (struct dwarf2_per_cu_data *target_per_cu)
25165 struct dwarf2_per_cu_data *per_cu, **last_chain;
25166 struct dwarf2_per_objfile *dwarf2_per_objfile
25167 = target_per_cu->dwarf2_per_objfile;
25169 per_cu = dwarf2_per_objfile->read_in_chain;
25170 last_chain = &dwarf2_per_objfile->read_in_chain;
25171 while (per_cu != NULL)
25173 struct dwarf2_per_cu_data *next_cu;
25175 next_cu = per_cu->cu->read_in_chain;
25177 if (per_cu == target_per_cu)
25181 *last_chain = next_cu;
25185 last_chain = &per_cu->cu->read_in_chain;
25191 /* Release all extra memory associated with OBJFILE. */
25194 dwarf2_free_objfile (struct objfile *objfile)
25196 struct dwarf2_per_objfile *dwarf2_per_objfile
25197 = get_dwarf2_per_objfile (objfile);
25199 delete dwarf2_per_objfile;
25202 /* A set of CU "per_cu" pointer, DIE offset, and GDB type pointer.
25203 We store these in a hash table separate from the DIEs, and preserve them
25204 when the DIEs are flushed out of cache.
25206 The CU "per_cu" pointer is needed because offset alone is not enough to
25207 uniquely identify the type. A file may have multiple .debug_types sections,
25208 or the type may come from a DWO file. Furthermore, while it's more logical
25209 to use per_cu->section+offset, with Fission the section with the data is in
25210 the DWO file but we don't know that section at the point we need it.
25211 We have to use something in dwarf2_per_cu_data (or the pointer to it)
25212 because we can enter the lookup routine, get_die_type_at_offset, from
25213 outside this file, and thus won't necessarily have PER_CU->cu.
25214 Fortunately, PER_CU is stable for the life of the objfile. */
25216 struct dwarf2_per_cu_offset_and_type
25218 const struct dwarf2_per_cu_data *per_cu;
25219 sect_offset sect_off;
25223 /* Hash function for a dwarf2_per_cu_offset_and_type. */
25226 per_cu_offset_and_type_hash (const void *item)
25228 const struct dwarf2_per_cu_offset_and_type *ofs
25229 = (const struct dwarf2_per_cu_offset_and_type *) item;
25231 return (uintptr_t) ofs->per_cu + to_underlying (ofs->sect_off);
25234 /* Equality function for a dwarf2_per_cu_offset_and_type. */
25237 per_cu_offset_and_type_eq (const void *item_lhs, const void *item_rhs)
25239 const struct dwarf2_per_cu_offset_and_type *ofs_lhs
25240 = (const struct dwarf2_per_cu_offset_and_type *) item_lhs;
25241 const struct dwarf2_per_cu_offset_and_type *ofs_rhs
25242 = (const struct dwarf2_per_cu_offset_and_type *) item_rhs;
25244 return (ofs_lhs->per_cu == ofs_rhs->per_cu
25245 && ofs_lhs->sect_off == ofs_rhs->sect_off);
25248 /* Set the type associated with DIE to TYPE. Save it in CU's hash
25249 table if necessary. For convenience, return TYPE.
25251 The DIEs reading must have careful ordering to:
25252 * Not cause infite loops trying to read in DIEs as a prerequisite for
25253 reading current DIE.
25254 * Not trying to dereference contents of still incompletely read in types
25255 while reading in other DIEs.
25256 * Enable referencing still incompletely read in types just by a pointer to
25257 the type without accessing its fields.
25259 Therefore caller should follow these rules:
25260 * Try to fetch any prerequisite types we may need to build this DIE type
25261 before building the type and calling set_die_type.
25262 * After building type call set_die_type for current DIE as soon as
25263 possible before fetching more types to complete the current type.
25264 * Make the type as complete as possible before fetching more types. */
25266 static struct type *
25267 set_die_type (struct die_info *die, struct type *type, struct dwarf2_cu *cu)
25269 struct dwarf2_per_objfile *dwarf2_per_objfile
25270 = cu->per_cu->dwarf2_per_objfile;
25271 struct dwarf2_per_cu_offset_and_type **slot, ofs;
25272 struct objfile *objfile = dwarf2_per_objfile->objfile;
25273 struct attribute *attr;
25274 struct dynamic_prop prop;
25276 /* For Ada types, make sure that the gnat-specific data is always
25277 initialized (if not already set). There are a few types where
25278 we should not be doing so, because the type-specific area is
25279 already used to hold some other piece of info (eg: TYPE_CODE_FLT
25280 where the type-specific area is used to store the floatformat).
25281 But this is not a problem, because the gnat-specific information
25282 is actually not needed for these types. */
25283 if (need_gnat_info (cu)
25284 && TYPE_CODE (type) != TYPE_CODE_FUNC
25285 && TYPE_CODE (type) != TYPE_CODE_FLT
25286 && TYPE_CODE (type) != TYPE_CODE_METHODPTR
25287 && TYPE_CODE (type) != TYPE_CODE_MEMBERPTR
25288 && TYPE_CODE (type) != TYPE_CODE_METHOD
25289 && !HAVE_GNAT_AUX_INFO (type))
25290 INIT_GNAT_SPECIFIC (type);
25292 /* Read DW_AT_allocated and set in type. */
25293 attr = dwarf2_attr (die, DW_AT_allocated, cu);
25294 if (attr_form_is_block (attr))
25296 if (attr_to_dynamic_prop (attr, die, cu, &prop))
25297 add_dyn_prop (DYN_PROP_ALLOCATED, prop, type);
25299 else if (attr != NULL)
25301 complaint (&symfile_complaints,
25302 _("DW_AT_allocated has the wrong form (%s) at DIE %s"),
25303 (attr != NULL ? dwarf_form_name (attr->form) : "n/a"),
25304 sect_offset_str (die->sect_off));
25307 /* Read DW_AT_associated and set in type. */
25308 attr = dwarf2_attr (die, DW_AT_associated, cu);
25309 if (attr_form_is_block (attr))
25311 if (attr_to_dynamic_prop (attr, die, cu, &prop))
25312 add_dyn_prop (DYN_PROP_ASSOCIATED, prop, type);
25314 else if (attr != NULL)
25316 complaint (&symfile_complaints,
25317 _("DW_AT_associated has the wrong form (%s) at DIE %s"),
25318 (attr != NULL ? dwarf_form_name (attr->form) : "n/a"),
25319 sect_offset_str (die->sect_off));
25322 /* Read DW_AT_data_location and set in type. */
25323 attr = dwarf2_attr (die, DW_AT_data_location, cu);
25324 if (attr_to_dynamic_prop (attr, die, cu, &prop))
25325 add_dyn_prop (DYN_PROP_DATA_LOCATION, prop, type);
25327 if (dwarf2_per_objfile->die_type_hash == NULL)
25329 dwarf2_per_objfile->die_type_hash =
25330 htab_create_alloc_ex (127,
25331 per_cu_offset_and_type_hash,
25332 per_cu_offset_and_type_eq,
25334 &objfile->objfile_obstack,
25335 hashtab_obstack_allocate,
25336 dummy_obstack_deallocate);
25339 ofs.per_cu = cu->per_cu;
25340 ofs.sect_off = die->sect_off;
25342 slot = (struct dwarf2_per_cu_offset_and_type **)
25343 htab_find_slot (dwarf2_per_objfile->die_type_hash, &ofs, INSERT);
25345 complaint (&symfile_complaints,
25346 _("A problem internal to GDB: DIE %s has type already set"),
25347 sect_offset_str (die->sect_off));
25348 *slot = XOBNEW (&objfile->objfile_obstack,
25349 struct dwarf2_per_cu_offset_and_type);
25354 /* Look up the type for the die at SECT_OFF in PER_CU in die_type_hash,
25355 or return NULL if the die does not have a saved type. */
25357 static struct type *
25358 get_die_type_at_offset (sect_offset sect_off,
25359 struct dwarf2_per_cu_data *per_cu)
25361 struct dwarf2_per_cu_offset_and_type *slot, ofs;
25362 struct dwarf2_per_objfile *dwarf2_per_objfile = per_cu->dwarf2_per_objfile;
25364 if (dwarf2_per_objfile->die_type_hash == NULL)
25367 ofs.per_cu = per_cu;
25368 ofs.sect_off = sect_off;
25369 slot = ((struct dwarf2_per_cu_offset_and_type *)
25370 htab_find (dwarf2_per_objfile->die_type_hash, &ofs));
25377 /* Look up the type for DIE in CU in die_type_hash,
25378 or return NULL if DIE does not have a saved type. */
25380 static struct type *
25381 get_die_type (struct die_info *die, struct dwarf2_cu *cu)
25383 return get_die_type_at_offset (die->sect_off, cu->per_cu);
25386 /* Add a dependence relationship from CU to REF_PER_CU. */
25389 dwarf2_add_dependence (struct dwarf2_cu *cu,
25390 struct dwarf2_per_cu_data *ref_per_cu)
25394 if (cu->dependencies == NULL)
25396 = htab_create_alloc_ex (5, htab_hash_pointer, htab_eq_pointer,
25397 NULL, &cu->comp_unit_obstack,
25398 hashtab_obstack_allocate,
25399 dummy_obstack_deallocate);
25401 slot = htab_find_slot (cu->dependencies, ref_per_cu, INSERT);
25403 *slot = ref_per_cu;
25406 /* Subroutine of dwarf2_mark to pass to htab_traverse.
25407 Set the mark field in every compilation unit in the
25408 cache that we must keep because we are keeping CU. */
25411 dwarf2_mark_helper (void **slot, void *data)
25413 struct dwarf2_per_cu_data *per_cu;
25415 per_cu = (struct dwarf2_per_cu_data *) *slot;
25417 /* cu->dependencies references may not yet have been ever read if QUIT aborts
25418 reading of the chain. As such dependencies remain valid it is not much
25419 useful to track and undo them during QUIT cleanups. */
25420 if (per_cu->cu == NULL)
25423 if (per_cu->cu->mark)
25425 per_cu->cu->mark = 1;
25427 if (per_cu->cu->dependencies != NULL)
25428 htab_traverse (per_cu->cu->dependencies, dwarf2_mark_helper, NULL);
25433 /* Set the mark field in CU and in every other compilation unit in the
25434 cache that we must keep because we are keeping CU. */
25437 dwarf2_mark (struct dwarf2_cu *cu)
25442 if (cu->dependencies != NULL)
25443 htab_traverse (cu->dependencies, dwarf2_mark_helper, NULL);
25447 dwarf2_clear_marks (struct dwarf2_per_cu_data *per_cu)
25451 per_cu->cu->mark = 0;
25452 per_cu = per_cu->cu->read_in_chain;
25456 /* Trivial hash function for partial_die_info: the hash value of a DIE
25457 is its offset in .debug_info for this objfile. */
25460 partial_die_hash (const void *item)
25462 const struct partial_die_info *part_die
25463 = (const struct partial_die_info *) item;
25465 return to_underlying (part_die->sect_off);
25468 /* Trivial comparison function for partial_die_info structures: two DIEs
25469 are equal if they have the same offset. */
25472 partial_die_eq (const void *item_lhs, const void *item_rhs)
25474 const struct partial_die_info *part_die_lhs
25475 = (const struct partial_die_info *) item_lhs;
25476 const struct partial_die_info *part_die_rhs
25477 = (const struct partial_die_info *) item_rhs;
25479 return part_die_lhs->sect_off == part_die_rhs->sect_off;
25482 static struct cmd_list_element *set_dwarf_cmdlist;
25483 static struct cmd_list_element *show_dwarf_cmdlist;
25486 set_dwarf_cmd (const char *args, int from_tty)
25488 help_list (set_dwarf_cmdlist, "maintenance set dwarf ", all_commands,
25493 show_dwarf_cmd (const char *args, int from_tty)
25495 cmd_show_list (show_dwarf_cmdlist, from_tty, "");
25498 /* The "save gdb-index" command. */
25500 /* Write SIZE bytes from the buffer pointed to by DATA to FILE, with
25504 file_write (FILE *file, const void *data, size_t size)
25506 if (fwrite (data, 1, size, file) != size)
25507 error (_("couldn't data write to file"));
25510 /* Write the contents of VEC to FILE, with error checking. */
25512 template<typename Elem, typename Alloc>
25514 file_write (FILE *file, const std::vector<Elem, Alloc> &vec)
25516 file_write (file, vec.data (), vec.size () * sizeof (vec[0]));
25519 /* In-memory buffer to prepare data to be written later to a file. */
25523 /* Copy DATA to the end of the buffer. */
25524 template<typename T>
25525 void append_data (const T &data)
25527 std::copy (reinterpret_cast<const gdb_byte *> (&data),
25528 reinterpret_cast<const gdb_byte *> (&data + 1),
25529 grow (sizeof (data)));
25532 /* Copy CSTR (a zero-terminated string) to the end of buffer. The
25533 terminating zero is appended too. */
25534 void append_cstr0 (const char *cstr)
25536 const size_t size = strlen (cstr) + 1;
25537 std::copy (cstr, cstr + size, grow (size));
25540 /* Store INPUT as ULEB128 to the end of buffer. */
25541 void append_unsigned_leb128 (ULONGEST input)
25545 gdb_byte output = input & 0x7f;
25549 append_data (output);
25555 /* Accept a host-format integer in VAL and append it to the buffer
25556 as a target-format integer which is LEN bytes long. */
25557 void append_uint (size_t len, bfd_endian byte_order, ULONGEST val)
25559 ::store_unsigned_integer (grow (len), len, byte_order, val);
25562 /* Return the size of the buffer. */
25563 size_t size () const
25565 return m_vec.size ();
25568 /* Return true iff the buffer is empty. */
25569 bool empty () const
25571 return m_vec.empty ();
25574 /* Write the buffer to FILE. */
25575 void file_write (FILE *file) const
25577 ::file_write (file, m_vec);
25581 /* Grow SIZE bytes at the end of the buffer. Returns a pointer to
25582 the start of the new block. */
25583 gdb_byte *grow (size_t size)
25585 m_vec.resize (m_vec.size () + size);
25586 return &*m_vec.end () - size;
25589 gdb::byte_vector m_vec;
25592 /* An entry in the symbol table. */
25593 struct symtab_index_entry
25595 /* The name of the symbol. */
25597 /* The offset of the name in the constant pool. */
25598 offset_type index_offset;
25599 /* A sorted vector of the indices of all the CUs that hold an object
25601 std::vector<offset_type> cu_indices;
25604 /* The symbol table. This is a power-of-2-sized hash table. */
25605 struct mapped_symtab
25609 data.resize (1024);
25612 offset_type n_elements = 0;
25613 std::vector<symtab_index_entry> data;
25616 /* Find a slot in SYMTAB for the symbol NAME. Returns a reference to
25619 Function is used only during write_hash_table so no index format backward
25620 compatibility is needed. */
25622 static symtab_index_entry &
25623 find_slot (struct mapped_symtab *symtab, const char *name)
25625 offset_type index, step, hash = mapped_index_string_hash (INT_MAX, name);
25627 index = hash & (symtab->data.size () - 1);
25628 step = ((hash * 17) & (symtab->data.size () - 1)) | 1;
25632 if (symtab->data[index].name == NULL
25633 || strcmp (name, symtab->data[index].name) == 0)
25634 return symtab->data[index];
25635 index = (index + step) & (symtab->data.size () - 1);
25639 /* Expand SYMTAB's hash table. */
25642 hash_expand (struct mapped_symtab *symtab)
25644 auto old_entries = std::move (symtab->data);
25646 symtab->data.clear ();
25647 symtab->data.resize (old_entries.size () * 2);
25649 for (auto &it : old_entries)
25650 if (it.name != NULL)
25652 auto &ref = find_slot (symtab, it.name);
25653 ref = std::move (it);
25657 /* Add an entry to SYMTAB. NAME is the name of the symbol.
25658 CU_INDEX is the index of the CU in which the symbol appears.
25659 IS_STATIC is one if the symbol is static, otherwise zero (global). */
25662 add_index_entry (struct mapped_symtab *symtab, const char *name,
25663 int is_static, gdb_index_symbol_kind kind,
25664 offset_type cu_index)
25666 offset_type cu_index_and_attrs;
25668 ++symtab->n_elements;
25669 if (4 * symtab->n_elements / 3 >= symtab->data.size ())
25670 hash_expand (symtab);
25672 symtab_index_entry &slot = find_slot (symtab, name);
25673 if (slot.name == NULL)
25676 /* index_offset is set later. */
25679 cu_index_and_attrs = 0;
25680 DW2_GDB_INDEX_CU_SET_VALUE (cu_index_and_attrs, cu_index);
25681 DW2_GDB_INDEX_SYMBOL_STATIC_SET_VALUE (cu_index_and_attrs, is_static);
25682 DW2_GDB_INDEX_SYMBOL_KIND_SET_VALUE (cu_index_and_attrs, kind);
25684 /* We don't want to record an index value twice as we want to avoid the
25686 We process all global symbols and then all static symbols
25687 (which would allow us to avoid the duplication by only having to check
25688 the last entry pushed), but a symbol could have multiple kinds in one CU.
25689 To keep things simple we don't worry about the duplication here and
25690 sort and uniqufy the list after we've processed all symbols. */
25691 slot.cu_indices.push_back (cu_index_and_attrs);
25694 /* Sort and remove duplicates of all symbols' cu_indices lists. */
25697 uniquify_cu_indices (struct mapped_symtab *symtab)
25699 for (auto &entry : symtab->data)
25701 if (entry.name != NULL && !entry.cu_indices.empty ())
25703 auto &cu_indices = entry.cu_indices;
25704 std::sort (cu_indices.begin (), cu_indices.end ());
25705 auto from = std::unique (cu_indices.begin (), cu_indices.end ());
25706 cu_indices.erase (from, cu_indices.end ());
25711 /* A form of 'const char *' suitable for container keys. Only the
25712 pointer is stored. The strings themselves are compared, not the
25717 c_str_view (const char *cstr)
25721 bool operator== (const c_str_view &other) const
25723 return strcmp (m_cstr, other.m_cstr) == 0;
25726 /* Return the underlying C string. Note, the returned string is
25727 only a reference with lifetime of this object. */
25728 const char *c_str () const
25734 friend class c_str_view_hasher;
25735 const char *const m_cstr;
25738 /* A std::unordered_map::hasher for c_str_view that uses the right
25739 hash function for strings in a mapped index. */
25740 class c_str_view_hasher
25743 size_t operator () (const c_str_view &x) const
25745 return mapped_index_string_hash (INT_MAX, x.m_cstr);
25749 /* A std::unordered_map::hasher for std::vector<>. */
25750 template<typename T>
25751 class vector_hasher
25754 size_t operator () (const std::vector<T> &key) const
25756 return iterative_hash (key.data (),
25757 sizeof (key.front ()) * key.size (), 0);
25761 /* Write the mapped hash table SYMTAB to the data buffer OUTPUT, with
25762 constant pool entries going into the data buffer CPOOL. */
25765 write_hash_table (mapped_symtab *symtab, data_buf &output, data_buf &cpool)
25768 /* Elements are sorted vectors of the indices of all the CUs that
25769 hold an object of this name. */
25770 std::unordered_map<std::vector<offset_type>, offset_type,
25771 vector_hasher<offset_type>>
25774 /* We add all the index vectors to the constant pool first, to
25775 ensure alignment is ok. */
25776 for (symtab_index_entry &entry : symtab->data)
25778 if (entry.name == NULL)
25780 gdb_assert (entry.index_offset == 0);
25782 /* Finding before inserting is faster than always trying to
25783 insert, because inserting always allocates a node, does the
25784 lookup, and then destroys the new node if another node
25785 already had the same key. C++17 try_emplace will avoid
25788 = symbol_hash_table.find (entry.cu_indices);
25789 if (found != symbol_hash_table.end ())
25791 entry.index_offset = found->second;
25795 symbol_hash_table.emplace (entry.cu_indices, cpool.size ());
25796 entry.index_offset = cpool.size ();
25797 cpool.append_data (MAYBE_SWAP (entry.cu_indices.size ()));
25798 for (const auto index : entry.cu_indices)
25799 cpool.append_data (MAYBE_SWAP (index));
25803 /* Now write out the hash table. */
25804 std::unordered_map<c_str_view, offset_type, c_str_view_hasher> str_table;
25805 for (const auto &entry : symtab->data)
25807 offset_type str_off, vec_off;
25809 if (entry.name != NULL)
25811 const auto insertpair = str_table.emplace (entry.name, cpool.size ());
25812 if (insertpair.second)
25813 cpool.append_cstr0 (entry.name);
25814 str_off = insertpair.first->second;
25815 vec_off = entry.index_offset;
25819 /* While 0 is a valid constant pool index, it is not valid
25820 to have 0 for both offsets. */
25825 output.append_data (MAYBE_SWAP (str_off));
25826 output.append_data (MAYBE_SWAP (vec_off));
25830 typedef std::unordered_map<partial_symtab *, unsigned int> psym_index_map;
25832 /* Helper struct for building the address table. */
25833 struct addrmap_index_data
25835 addrmap_index_data (data_buf &addr_vec_, psym_index_map &cu_index_htab_)
25836 : addr_vec (addr_vec_), cu_index_htab (cu_index_htab_)
25839 struct objfile *objfile;
25840 data_buf &addr_vec;
25841 psym_index_map &cu_index_htab;
25843 /* Non-zero if the previous_* fields are valid.
25844 We can't write an entry until we see the next entry (since it is only then
25845 that we know the end of the entry). */
25846 int previous_valid;
25847 /* Index of the CU in the table of all CUs in the index file. */
25848 unsigned int previous_cu_index;
25849 /* Start address of the CU. */
25850 CORE_ADDR previous_cu_start;
25853 /* Write an address entry to ADDR_VEC. */
25856 add_address_entry (struct objfile *objfile, data_buf &addr_vec,
25857 CORE_ADDR start, CORE_ADDR end, unsigned int cu_index)
25859 CORE_ADDR baseaddr;
25861 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
25863 addr_vec.append_uint (8, BFD_ENDIAN_LITTLE, start - baseaddr);
25864 addr_vec.append_uint (8, BFD_ENDIAN_LITTLE, end - baseaddr);
25865 addr_vec.append_data (MAYBE_SWAP (cu_index));
25868 /* Worker function for traversing an addrmap to build the address table. */
25871 add_address_entry_worker (void *datap, CORE_ADDR start_addr, void *obj)
25873 struct addrmap_index_data *data = (struct addrmap_index_data *) datap;
25874 struct partial_symtab *pst = (struct partial_symtab *) obj;
25876 if (data->previous_valid)
25877 add_address_entry (data->objfile, data->addr_vec,
25878 data->previous_cu_start, start_addr,
25879 data->previous_cu_index);
25881 data->previous_cu_start = start_addr;
25884 const auto it = data->cu_index_htab.find (pst);
25885 gdb_assert (it != data->cu_index_htab.cend ());
25886 data->previous_cu_index = it->second;
25887 data->previous_valid = 1;
25890 data->previous_valid = 0;
25895 /* Write OBJFILE's address map to ADDR_VEC.
25896 CU_INDEX_HTAB is used to map addrmap entries to their CU indices
25897 in the index file. */
25900 write_address_map (struct objfile *objfile, data_buf &addr_vec,
25901 psym_index_map &cu_index_htab)
25903 struct addrmap_index_data addrmap_index_data (addr_vec, cu_index_htab);
25905 /* When writing the address table, we have to cope with the fact that
25906 the addrmap iterator only provides the start of a region; we have to
25907 wait until the next invocation to get the start of the next region. */
25909 addrmap_index_data.objfile = objfile;
25910 addrmap_index_data.previous_valid = 0;
25912 addrmap_foreach (objfile->psymtabs_addrmap, add_address_entry_worker,
25913 &addrmap_index_data);
25915 /* It's highly unlikely the last entry (end address = 0xff...ff)
25916 is valid, but we should still handle it.
25917 The end address is recorded as the start of the next region, but that
25918 doesn't work here. To cope we pass 0xff...ff, this is a rare situation
25920 if (addrmap_index_data.previous_valid)
25921 add_address_entry (objfile, addr_vec,
25922 addrmap_index_data.previous_cu_start, (CORE_ADDR) -1,
25923 addrmap_index_data.previous_cu_index);
25926 /* Return the symbol kind of PSYM. */
25928 static gdb_index_symbol_kind
25929 symbol_kind (struct partial_symbol *psym)
25931 domain_enum domain = PSYMBOL_DOMAIN (psym);
25932 enum address_class aclass = PSYMBOL_CLASS (psym);
25940 return GDB_INDEX_SYMBOL_KIND_FUNCTION;
25942 return GDB_INDEX_SYMBOL_KIND_TYPE;
25944 case LOC_CONST_BYTES:
25945 case LOC_OPTIMIZED_OUT:
25947 return GDB_INDEX_SYMBOL_KIND_VARIABLE;
25949 /* Note: It's currently impossible to recognize psyms as enum values
25950 short of reading the type info. For now punt. */
25951 return GDB_INDEX_SYMBOL_KIND_VARIABLE;
25953 /* There are other LOC_FOO values that one might want to classify
25954 as variables, but dwarf2read.c doesn't currently use them. */
25955 return GDB_INDEX_SYMBOL_KIND_OTHER;
25957 case STRUCT_DOMAIN:
25958 return GDB_INDEX_SYMBOL_KIND_TYPE;
25960 return GDB_INDEX_SYMBOL_KIND_OTHER;
25964 /* Add a list of partial symbols to SYMTAB. */
25967 write_psymbols (struct mapped_symtab *symtab,
25968 std::unordered_set<partial_symbol *> &psyms_seen,
25969 struct partial_symbol **psymp,
25971 offset_type cu_index,
25974 for (; count-- > 0; ++psymp)
25976 struct partial_symbol *psym = *psymp;
25978 if (SYMBOL_LANGUAGE (psym) == language_ada)
25979 error (_("Ada is not currently supported by the index"));
25981 /* Only add a given psymbol once. */
25982 if (psyms_seen.insert (psym).second)
25984 gdb_index_symbol_kind kind = symbol_kind (psym);
25986 add_index_entry (symtab, SYMBOL_SEARCH_NAME (psym),
25987 is_static, kind, cu_index);
25992 /* A helper struct used when iterating over debug_types. */
25993 struct signatured_type_index_data
25995 signatured_type_index_data (data_buf &types_list_,
25996 std::unordered_set<partial_symbol *> &psyms_seen_)
25997 : types_list (types_list_), psyms_seen (psyms_seen_)
26000 struct objfile *objfile;
26001 struct mapped_symtab *symtab;
26002 data_buf &types_list;
26003 std::unordered_set<partial_symbol *> &psyms_seen;
26007 /* A helper function that writes a single signatured_type to an
26011 write_one_signatured_type (void **slot, void *d)
26013 struct signatured_type_index_data *info
26014 = (struct signatured_type_index_data *) d;
26015 struct signatured_type *entry = (struct signatured_type *) *slot;
26016 struct partial_symtab *psymtab = entry->per_cu.v.psymtab;
26018 write_psymbols (info->symtab,
26020 &info->objfile->global_psymbols[psymtab->globals_offset],
26021 psymtab->n_global_syms, info->cu_index,
26023 write_psymbols (info->symtab,
26025 &info->objfile->static_psymbols[psymtab->statics_offset],
26026 psymtab->n_static_syms, info->cu_index,
26029 info->types_list.append_uint (8, BFD_ENDIAN_LITTLE,
26030 to_underlying (entry->per_cu.sect_off));
26031 info->types_list.append_uint (8, BFD_ENDIAN_LITTLE,
26032 to_underlying (entry->type_offset_in_tu));
26033 info->types_list.append_uint (8, BFD_ENDIAN_LITTLE, entry->signature);
26040 /* Recurse into all "included" dependencies and count their symbols as
26041 if they appeared in this psymtab. */
26044 recursively_count_psymbols (struct partial_symtab *psymtab,
26045 size_t &psyms_seen)
26047 for (int i = 0; i < psymtab->number_of_dependencies; ++i)
26048 if (psymtab->dependencies[i]->user != NULL)
26049 recursively_count_psymbols (psymtab->dependencies[i],
26052 psyms_seen += psymtab->n_global_syms;
26053 psyms_seen += psymtab->n_static_syms;
26056 /* Recurse into all "included" dependencies and write their symbols as
26057 if they appeared in this psymtab. */
26060 recursively_write_psymbols (struct objfile *objfile,
26061 struct partial_symtab *psymtab,
26062 struct mapped_symtab *symtab,
26063 std::unordered_set<partial_symbol *> &psyms_seen,
26064 offset_type cu_index)
26068 for (i = 0; i < psymtab->number_of_dependencies; ++i)
26069 if (psymtab->dependencies[i]->user != NULL)
26070 recursively_write_psymbols (objfile, psymtab->dependencies[i],
26071 symtab, psyms_seen, cu_index);
26073 write_psymbols (symtab,
26075 &objfile->global_psymbols[psymtab->globals_offset],
26076 psymtab->n_global_syms, cu_index,
26078 write_psymbols (symtab,
26080 &objfile->static_psymbols[psymtab->statics_offset],
26081 psymtab->n_static_syms, cu_index,
26085 /* DWARF-5 .debug_names builder. */
26089 debug_names (struct dwarf2_per_objfile *dwarf2_per_objfile, bool is_dwarf64,
26090 bfd_endian dwarf5_byte_order)
26091 : m_dwarf5_byte_order (dwarf5_byte_order),
26092 m_dwarf32 (dwarf5_byte_order),
26093 m_dwarf64 (dwarf5_byte_order),
26094 m_dwarf (is_dwarf64
26095 ? static_cast<dwarf &> (m_dwarf64)
26096 : static_cast<dwarf &> (m_dwarf32)),
26097 m_name_table_string_offs (m_dwarf.name_table_string_offs),
26098 m_name_table_entry_offs (m_dwarf.name_table_entry_offs),
26099 m_debugstrlookup (dwarf2_per_objfile)
26102 int dwarf5_offset_size () const
26104 const bool dwarf5_is_dwarf64 = &m_dwarf == &m_dwarf64;
26105 return dwarf5_is_dwarf64 ? 8 : 4;
26108 /* Is this symbol from DW_TAG_compile_unit or DW_TAG_type_unit? */
26109 enum class unit_kind { cu, tu };
26111 /* Insert one symbol. */
26112 void insert (const partial_symbol *psym, int cu_index, bool is_static,
26115 const int dwarf_tag = psymbol_tag (psym);
26116 if (dwarf_tag == 0)
26118 const char *const name = SYMBOL_SEARCH_NAME (psym);
26119 const auto insertpair
26120 = m_name_to_value_set.emplace (c_str_view (name),
26121 std::set<symbol_value> ());
26122 std::set<symbol_value> &value_set = insertpair.first->second;
26123 value_set.emplace (symbol_value (dwarf_tag, cu_index, is_static, kind));
26126 /* Build all the tables. All symbols must be already inserted.
26127 This function does not call file_write, caller has to do it
26131 /* Verify the build method has not be called twice. */
26132 gdb_assert (m_abbrev_table.empty ());
26133 const size_t name_count = m_name_to_value_set.size ();
26134 m_bucket_table.resize
26135 (std::pow (2, std::ceil (std::log2 (name_count * 4 / 3))));
26136 m_hash_table.reserve (name_count);
26137 m_name_table_string_offs.reserve (name_count);
26138 m_name_table_entry_offs.reserve (name_count);
26140 /* Map each hash of symbol to its name and value. */
26141 struct hash_it_pair
26144 decltype (m_name_to_value_set)::const_iterator it;
26146 std::vector<std::forward_list<hash_it_pair>> bucket_hash;
26147 bucket_hash.resize (m_bucket_table.size ());
26148 for (decltype (m_name_to_value_set)::const_iterator it
26149 = m_name_to_value_set.cbegin ();
26150 it != m_name_to_value_set.cend ();
26153 const char *const name = it->first.c_str ();
26154 const uint32_t hash = dwarf5_djb_hash (name);
26155 hash_it_pair hashitpair;
26156 hashitpair.hash = hash;
26157 hashitpair.it = it;
26158 auto &slot = bucket_hash[hash % bucket_hash.size()];
26159 slot.push_front (std::move (hashitpair));
26161 for (size_t bucket_ix = 0; bucket_ix < bucket_hash.size (); ++bucket_ix)
26163 const std::forward_list<hash_it_pair> &hashitlist
26164 = bucket_hash[bucket_ix];
26165 if (hashitlist.empty ())
26167 uint32_t &bucket_slot = m_bucket_table[bucket_ix];
26168 /* The hashes array is indexed starting at 1. */
26169 store_unsigned_integer (reinterpret_cast<gdb_byte *> (&bucket_slot),
26170 sizeof (bucket_slot), m_dwarf5_byte_order,
26171 m_hash_table.size () + 1);
26172 for (const hash_it_pair &hashitpair : hashitlist)
26174 m_hash_table.push_back (0);
26175 store_unsigned_integer (reinterpret_cast<gdb_byte *>
26176 (&m_hash_table.back ()),
26177 sizeof (m_hash_table.back ()),
26178 m_dwarf5_byte_order, hashitpair.hash);
26179 const c_str_view &name = hashitpair.it->first;
26180 const std::set<symbol_value> &value_set = hashitpair.it->second;
26181 m_name_table_string_offs.push_back_reorder
26182 (m_debugstrlookup.lookup (name.c_str ()));
26183 m_name_table_entry_offs.push_back_reorder (m_entry_pool.size ());
26184 gdb_assert (!value_set.empty ());
26185 for (const symbol_value &value : value_set)
26187 int &idx = m_indexkey_to_idx[index_key (value.dwarf_tag,
26192 idx = m_idx_next++;
26193 m_abbrev_table.append_unsigned_leb128 (idx);
26194 m_abbrev_table.append_unsigned_leb128 (value.dwarf_tag);
26195 m_abbrev_table.append_unsigned_leb128
26196 (value.kind == unit_kind::cu ? DW_IDX_compile_unit
26197 : DW_IDX_type_unit);
26198 m_abbrev_table.append_unsigned_leb128 (DW_FORM_udata);
26199 m_abbrev_table.append_unsigned_leb128 (value.is_static
26200 ? DW_IDX_GNU_internal
26201 : DW_IDX_GNU_external);
26202 m_abbrev_table.append_unsigned_leb128 (DW_FORM_flag_present);
26204 /* Terminate attributes list. */
26205 m_abbrev_table.append_unsigned_leb128 (0);
26206 m_abbrev_table.append_unsigned_leb128 (0);
26209 m_entry_pool.append_unsigned_leb128 (idx);
26210 m_entry_pool.append_unsigned_leb128 (value.cu_index);
26213 /* Terminate the list of CUs. */
26214 m_entry_pool.append_unsigned_leb128 (0);
26217 gdb_assert (m_hash_table.size () == name_count);
26219 /* Terminate tags list. */
26220 m_abbrev_table.append_unsigned_leb128 (0);
26223 /* Return .debug_names bucket count. This must be called only after
26224 calling the build method. */
26225 uint32_t bucket_count () const
26227 /* Verify the build method has been already called. */
26228 gdb_assert (!m_abbrev_table.empty ());
26229 const uint32_t retval = m_bucket_table.size ();
26231 /* Check for overflow. */
26232 gdb_assert (retval == m_bucket_table.size ());
26236 /* Return .debug_names names count. This must be called only after
26237 calling the build method. */
26238 uint32_t name_count () const
26240 /* Verify the build method has been already called. */
26241 gdb_assert (!m_abbrev_table.empty ());
26242 const uint32_t retval = m_hash_table.size ();
26244 /* Check for overflow. */
26245 gdb_assert (retval == m_hash_table.size ());
26249 /* Return number of bytes of .debug_names abbreviation table. This
26250 must be called only after calling the build method. */
26251 uint32_t abbrev_table_bytes () const
26253 gdb_assert (!m_abbrev_table.empty ());
26254 return m_abbrev_table.size ();
26257 /* Recurse into all "included" dependencies and store their symbols
26258 as if they appeared in this psymtab. */
26259 void recursively_write_psymbols
26260 (struct objfile *objfile,
26261 struct partial_symtab *psymtab,
26262 std::unordered_set<partial_symbol *> &psyms_seen,
26265 for (int i = 0; i < psymtab->number_of_dependencies; ++i)
26266 if (psymtab->dependencies[i]->user != NULL)
26267 recursively_write_psymbols (objfile, psymtab->dependencies[i],
26268 psyms_seen, cu_index);
26270 write_psymbols (psyms_seen,
26271 &objfile->global_psymbols[psymtab->globals_offset],
26272 psymtab->n_global_syms, cu_index, false, unit_kind::cu);
26273 write_psymbols (psyms_seen,
26274 &objfile->static_psymbols[psymtab->statics_offset],
26275 psymtab->n_static_syms, cu_index, true, unit_kind::cu);
26278 /* Return number of bytes the .debug_names section will have. This
26279 must be called only after calling the build method. */
26280 size_t bytes () const
26282 /* Verify the build method has been already called. */
26283 gdb_assert (!m_abbrev_table.empty ());
26284 size_t expected_bytes = 0;
26285 expected_bytes += m_bucket_table.size () * sizeof (m_bucket_table[0]);
26286 expected_bytes += m_hash_table.size () * sizeof (m_hash_table[0]);
26287 expected_bytes += m_name_table_string_offs.bytes ();
26288 expected_bytes += m_name_table_entry_offs.bytes ();
26289 expected_bytes += m_abbrev_table.size ();
26290 expected_bytes += m_entry_pool.size ();
26291 return expected_bytes;
26294 /* Write .debug_names to FILE_NAMES and .debug_str addition to
26295 FILE_STR. This must be called only after calling the build
26297 void file_write (FILE *file_names, FILE *file_str) const
26299 /* Verify the build method has been already called. */
26300 gdb_assert (!m_abbrev_table.empty ());
26301 ::file_write (file_names, m_bucket_table);
26302 ::file_write (file_names, m_hash_table);
26303 m_name_table_string_offs.file_write (file_names);
26304 m_name_table_entry_offs.file_write (file_names);
26305 m_abbrev_table.file_write (file_names);
26306 m_entry_pool.file_write (file_names);
26307 m_debugstrlookup.file_write (file_str);
26310 /* A helper user data for write_one_signatured_type. */
26311 class write_one_signatured_type_data
26314 write_one_signatured_type_data (debug_names &nametable_,
26315 signatured_type_index_data &&info_)
26316 : nametable (nametable_), info (std::move (info_))
26318 debug_names &nametable;
26319 struct signatured_type_index_data info;
26322 /* A helper function to pass write_one_signatured_type to
26323 htab_traverse_noresize. */
26325 write_one_signatured_type (void **slot, void *d)
26327 write_one_signatured_type_data *data = (write_one_signatured_type_data *) d;
26328 struct signatured_type_index_data *info = &data->info;
26329 struct signatured_type *entry = (struct signatured_type *) *slot;
26331 data->nametable.write_one_signatured_type (entry, info);
26338 /* Storage for symbol names mapping them to their .debug_str section
26340 class debug_str_lookup
26344 /* Object costructor to be called for current DWARF2_PER_OBJFILE.
26345 All .debug_str section strings are automatically stored. */
26346 debug_str_lookup (struct dwarf2_per_objfile *dwarf2_per_objfile)
26347 : m_abfd (dwarf2_per_objfile->objfile->obfd),
26348 m_dwarf2_per_objfile (dwarf2_per_objfile)
26350 dwarf2_read_section (dwarf2_per_objfile->objfile,
26351 &dwarf2_per_objfile->str);
26352 if (dwarf2_per_objfile->str.buffer == NULL)
26354 for (const gdb_byte *data = dwarf2_per_objfile->str.buffer;
26355 data < (dwarf2_per_objfile->str.buffer
26356 + dwarf2_per_objfile->str.size);)
26358 const char *const s = reinterpret_cast<const char *> (data);
26359 const auto insertpair
26360 = m_str_table.emplace (c_str_view (s),
26361 data - dwarf2_per_objfile->str.buffer);
26362 if (!insertpair.second)
26363 complaint (&symfile_complaints,
26364 _("Duplicate string \"%s\" in "
26365 ".debug_str section [in module %s]"),
26366 s, bfd_get_filename (m_abfd));
26367 data += strlen (s) + 1;
26371 /* Return offset of symbol name S in the .debug_str section. Add
26372 such symbol to the section's end if it does not exist there
26374 size_t lookup (const char *s)
26376 const auto it = m_str_table.find (c_str_view (s));
26377 if (it != m_str_table.end ())
26379 const size_t offset = (m_dwarf2_per_objfile->str.size
26380 + m_str_add_buf.size ());
26381 m_str_table.emplace (c_str_view (s), offset);
26382 m_str_add_buf.append_cstr0 (s);
26386 /* Append the end of the .debug_str section to FILE. */
26387 void file_write (FILE *file) const
26389 m_str_add_buf.file_write (file);
26393 std::unordered_map<c_str_view, size_t, c_str_view_hasher> m_str_table;
26395 struct dwarf2_per_objfile *m_dwarf2_per_objfile;
26397 /* Data to add at the end of .debug_str for new needed symbol names. */
26398 data_buf m_str_add_buf;
26401 /* Container to map used DWARF tags to their .debug_names abbreviation
26406 index_key (int dwarf_tag_, bool is_static_, unit_kind kind_)
26407 : dwarf_tag (dwarf_tag_), is_static (is_static_), kind (kind_)
26412 operator== (const index_key &other) const
26414 return (dwarf_tag == other.dwarf_tag && is_static == other.is_static
26415 && kind == other.kind);
26418 const int dwarf_tag;
26419 const bool is_static;
26420 const unit_kind kind;
26423 /* Provide std::unordered_map::hasher for index_key. */
26424 class index_key_hasher
26428 operator () (const index_key &key) const
26430 return (std::hash<int>() (key.dwarf_tag) << 1) | key.is_static;
26434 /* Parameters of one symbol entry. */
26438 const int dwarf_tag, cu_index;
26439 const bool is_static;
26440 const unit_kind kind;
26442 symbol_value (int dwarf_tag_, int cu_index_, bool is_static_,
26444 : dwarf_tag (dwarf_tag_), cu_index (cu_index_), is_static (is_static_),
26449 operator< (const symbol_value &other) const
26469 /* Abstract base class to unify DWARF-32 and DWARF-64 name table
26474 const bfd_endian dwarf5_byte_order;
26476 explicit offset_vec (bfd_endian dwarf5_byte_order_)
26477 : dwarf5_byte_order (dwarf5_byte_order_)
26480 /* Call std::vector::reserve for NELEM elements. */
26481 virtual void reserve (size_t nelem) = 0;
26483 /* Call std::vector::push_back with store_unsigned_integer byte
26484 reordering for ELEM. */
26485 virtual void push_back_reorder (size_t elem) = 0;
26487 /* Return expected output size in bytes. */
26488 virtual size_t bytes () const = 0;
26490 /* Write name table to FILE. */
26491 virtual void file_write (FILE *file) const = 0;
26494 /* Template to unify DWARF-32 and DWARF-64 output. */
26495 template<typename OffsetSize>
26496 class offset_vec_tmpl : public offset_vec
26499 explicit offset_vec_tmpl (bfd_endian dwarf5_byte_order_)
26500 : offset_vec (dwarf5_byte_order_)
26503 /* Implement offset_vec::reserve. */
26504 void reserve (size_t nelem) override
26506 m_vec.reserve (nelem);
26509 /* Implement offset_vec::push_back_reorder. */
26510 void push_back_reorder (size_t elem) override
26512 m_vec.push_back (elem);
26513 /* Check for overflow. */
26514 gdb_assert (m_vec.back () == elem);
26515 store_unsigned_integer (reinterpret_cast<gdb_byte *> (&m_vec.back ()),
26516 sizeof (m_vec.back ()), dwarf5_byte_order, elem);
26519 /* Implement offset_vec::bytes. */
26520 size_t bytes () const override
26522 return m_vec.size () * sizeof (m_vec[0]);
26525 /* Implement offset_vec::file_write. */
26526 void file_write (FILE *file) const override
26528 ::file_write (file, m_vec);
26532 std::vector<OffsetSize> m_vec;
26535 /* Base class to unify DWARF-32 and DWARF-64 .debug_names output
26536 respecting name table width. */
26540 offset_vec &name_table_string_offs, &name_table_entry_offs;
26542 dwarf (offset_vec &name_table_string_offs_,
26543 offset_vec &name_table_entry_offs_)
26544 : name_table_string_offs (name_table_string_offs_),
26545 name_table_entry_offs (name_table_entry_offs_)
26550 /* Template to unify DWARF-32 and DWARF-64 .debug_names output
26551 respecting name table width. */
26552 template<typename OffsetSize>
26553 class dwarf_tmpl : public dwarf
26556 explicit dwarf_tmpl (bfd_endian dwarf5_byte_order_)
26557 : dwarf (m_name_table_string_offs, m_name_table_entry_offs),
26558 m_name_table_string_offs (dwarf5_byte_order_),
26559 m_name_table_entry_offs (dwarf5_byte_order_)
26563 offset_vec_tmpl<OffsetSize> m_name_table_string_offs;
26564 offset_vec_tmpl<OffsetSize> m_name_table_entry_offs;
26567 /* Try to reconstruct original DWARF tag for given partial_symbol.
26568 This function is not DWARF-5 compliant but it is sufficient for
26569 GDB as a DWARF-5 index consumer. */
26570 static int psymbol_tag (const struct partial_symbol *psym)
26572 domain_enum domain = PSYMBOL_DOMAIN (psym);
26573 enum address_class aclass = PSYMBOL_CLASS (psym);
26581 return DW_TAG_subprogram;
26583 return DW_TAG_typedef;
26585 case LOC_CONST_BYTES:
26586 case LOC_OPTIMIZED_OUT:
26588 return DW_TAG_variable;
26590 /* Note: It's currently impossible to recognize psyms as enum values
26591 short of reading the type info. For now punt. */
26592 return DW_TAG_variable;
26594 /* There are other LOC_FOO values that one might want to classify
26595 as variables, but dwarf2read.c doesn't currently use them. */
26596 return DW_TAG_variable;
26598 case STRUCT_DOMAIN:
26599 return DW_TAG_structure_type;
26605 /* Call insert for all partial symbols and mark them in PSYMS_SEEN. */
26606 void write_psymbols (std::unordered_set<partial_symbol *> &psyms_seen,
26607 struct partial_symbol **psymp, int count, int cu_index,
26608 bool is_static, unit_kind kind)
26610 for (; count-- > 0; ++psymp)
26612 struct partial_symbol *psym = *psymp;
26614 if (SYMBOL_LANGUAGE (psym) == language_ada)
26615 error (_("Ada is not currently supported by the index"));
26617 /* Only add a given psymbol once. */
26618 if (psyms_seen.insert (psym).second)
26619 insert (psym, cu_index, is_static, kind);
26623 /* A helper function that writes a single signatured_type
26624 to a debug_names. */
26626 write_one_signatured_type (struct signatured_type *entry,
26627 struct signatured_type_index_data *info)
26629 struct partial_symtab *psymtab = entry->per_cu.v.psymtab;
26631 write_psymbols (info->psyms_seen,
26632 &info->objfile->global_psymbols[psymtab->globals_offset],
26633 psymtab->n_global_syms, info->cu_index, false,
26635 write_psymbols (info->psyms_seen,
26636 &info->objfile->static_psymbols[psymtab->statics_offset],
26637 psymtab->n_static_syms, info->cu_index, true,
26640 info->types_list.append_uint (dwarf5_offset_size (), m_dwarf5_byte_order,
26641 to_underlying (entry->per_cu.sect_off));
26646 /* Store value of each symbol. */
26647 std::unordered_map<c_str_view, std::set<symbol_value>, c_str_view_hasher>
26648 m_name_to_value_set;
26650 /* Tables of DWARF-5 .debug_names. They are in object file byte
26652 std::vector<uint32_t> m_bucket_table;
26653 std::vector<uint32_t> m_hash_table;
26655 const bfd_endian m_dwarf5_byte_order;
26656 dwarf_tmpl<uint32_t> m_dwarf32;
26657 dwarf_tmpl<uint64_t> m_dwarf64;
26659 offset_vec &m_name_table_string_offs, &m_name_table_entry_offs;
26660 debug_str_lookup m_debugstrlookup;
26662 /* Map each used .debug_names abbreviation tag parameter to its
26664 std::unordered_map<index_key, int, index_key_hasher> m_indexkey_to_idx;
26666 /* Next unused .debug_names abbreviation tag for
26667 m_indexkey_to_idx. */
26668 int m_idx_next = 1;
26670 /* .debug_names abbreviation table. */
26671 data_buf m_abbrev_table;
26673 /* .debug_names entry pool. */
26674 data_buf m_entry_pool;
26677 /* Return iff any of the needed offsets does not fit into 32-bit
26678 .debug_names section. */
26681 check_dwarf64_offsets (struct dwarf2_per_objfile *dwarf2_per_objfile)
26683 for (int i = 0; i < dwarf2_per_objfile->n_comp_units; ++i)
26685 const dwarf2_per_cu_data &per_cu = *dwarf2_per_objfile->all_comp_units[i];
26687 if (to_underlying (per_cu.sect_off) >= (static_cast<uint64_t> (1) << 32))
26690 for (int i = 0; i < dwarf2_per_objfile->n_type_units; ++i)
26692 const signatured_type &sigtype = *dwarf2_per_objfile->all_type_units[i];
26693 const dwarf2_per_cu_data &per_cu = sigtype.per_cu;
26695 if (to_underlying (per_cu.sect_off) >= (static_cast<uint64_t> (1) << 32))
26701 /* The psyms_seen set is potentially going to be largish (~40k
26702 elements when indexing a -g3 build of GDB itself). Estimate the
26703 number of elements in order to avoid too many rehashes, which
26704 require rebuilding buckets and thus many trips to
26708 psyms_seen_size (struct dwarf2_per_objfile *dwarf2_per_objfile)
26710 size_t psyms_count = 0;
26711 for (int i = 0; i < dwarf2_per_objfile->n_comp_units; ++i)
26713 struct dwarf2_per_cu_data *per_cu
26714 = dwarf2_per_objfile->all_comp_units[i];
26715 struct partial_symtab *psymtab = per_cu->v.psymtab;
26717 if (psymtab != NULL && psymtab->user == NULL)
26718 recursively_count_psymbols (psymtab, psyms_count);
26720 /* Generating an index for gdb itself shows a ratio of
26721 TOTAL_SEEN_SYMS/UNIQUE_SYMS or ~5. 4 seems like a good bet. */
26722 return psyms_count / 4;
26725 /* Write new .gdb_index section for OBJFILE into OUT_FILE.
26726 Return how many bytes were expected to be written into OUT_FILE. */
26729 write_gdbindex (struct dwarf2_per_objfile *dwarf2_per_objfile, FILE *out_file)
26731 struct objfile *objfile = dwarf2_per_objfile->objfile;
26732 mapped_symtab symtab;
26735 /* While we're scanning CU's create a table that maps a psymtab pointer
26736 (which is what addrmap records) to its index (which is what is recorded
26737 in the index file). This will later be needed to write the address
26739 psym_index_map cu_index_htab;
26740 cu_index_htab.reserve (dwarf2_per_objfile->n_comp_units);
26742 /* The CU list is already sorted, so we don't need to do additional
26743 work here. Also, the debug_types entries do not appear in
26744 all_comp_units, but only in their own hash table. */
26746 std::unordered_set<partial_symbol *> psyms_seen
26747 (psyms_seen_size (dwarf2_per_objfile));
26748 for (int i = 0; i < dwarf2_per_objfile->n_comp_units; ++i)
26750 struct dwarf2_per_cu_data *per_cu
26751 = dwarf2_per_objfile->all_comp_units[i];
26752 struct partial_symtab *psymtab = per_cu->v.psymtab;
26754 /* CU of a shared file from 'dwz -m' may be unused by this main file.
26755 It may be referenced from a local scope but in such case it does not
26756 need to be present in .gdb_index. */
26757 if (psymtab == NULL)
26760 if (psymtab->user == NULL)
26761 recursively_write_psymbols (objfile, psymtab, &symtab,
26764 const auto insertpair = cu_index_htab.emplace (psymtab, i);
26765 gdb_assert (insertpair.second);
26767 cu_list.append_uint (8, BFD_ENDIAN_LITTLE,
26768 to_underlying (per_cu->sect_off));
26769 cu_list.append_uint (8, BFD_ENDIAN_LITTLE, per_cu->length);
26772 /* Dump the address map. */
26774 write_address_map (objfile, addr_vec, cu_index_htab);
26776 /* Write out the .debug_type entries, if any. */
26777 data_buf types_cu_list;
26778 if (dwarf2_per_objfile->signatured_types)
26780 signatured_type_index_data sig_data (types_cu_list,
26783 sig_data.objfile = objfile;
26784 sig_data.symtab = &symtab;
26785 sig_data.cu_index = dwarf2_per_objfile->n_comp_units;
26786 htab_traverse_noresize (dwarf2_per_objfile->signatured_types,
26787 write_one_signatured_type, &sig_data);
26790 /* Now that we've processed all symbols we can shrink their cu_indices
26792 uniquify_cu_indices (&symtab);
26794 data_buf symtab_vec, constant_pool;
26795 write_hash_table (&symtab, symtab_vec, constant_pool);
26798 const offset_type size_of_contents = 6 * sizeof (offset_type);
26799 offset_type total_len = size_of_contents;
26801 /* The version number. */
26802 contents.append_data (MAYBE_SWAP (8));
26804 /* The offset of the CU list from the start of the file. */
26805 contents.append_data (MAYBE_SWAP (total_len));
26806 total_len += cu_list.size ();
26808 /* The offset of the types CU list from the start of the file. */
26809 contents.append_data (MAYBE_SWAP (total_len));
26810 total_len += types_cu_list.size ();
26812 /* The offset of the address table from the start of the file. */
26813 contents.append_data (MAYBE_SWAP (total_len));
26814 total_len += addr_vec.size ();
26816 /* The offset of the symbol table from the start of the file. */
26817 contents.append_data (MAYBE_SWAP (total_len));
26818 total_len += symtab_vec.size ();
26820 /* The offset of the constant pool from the start of the file. */
26821 contents.append_data (MAYBE_SWAP (total_len));
26822 total_len += constant_pool.size ();
26824 gdb_assert (contents.size () == size_of_contents);
26826 contents.file_write (out_file);
26827 cu_list.file_write (out_file);
26828 types_cu_list.file_write (out_file);
26829 addr_vec.file_write (out_file);
26830 symtab_vec.file_write (out_file);
26831 constant_pool.file_write (out_file);
26836 /* DWARF-5 augmentation string for GDB's DW_IDX_GNU_* extension. */
26837 static const gdb_byte dwarf5_gdb_augmentation[] = { 'G', 'D', 'B', 0 };
26839 /* Write a new .debug_names section for OBJFILE into OUT_FILE, write
26840 needed addition to .debug_str section to OUT_FILE_STR. Return how
26841 many bytes were expected to be written into OUT_FILE. */
26844 write_debug_names (struct dwarf2_per_objfile *dwarf2_per_objfile,
26845 FILE *out_file, FILE *out_file_str)
26847 const bool dwarf5_is_dwarf64 = check_dwarf64_offsets (dwarf2_per_objfile);
26848 struct objfile *objfile = dwarf2_per_objfile->objfile;
26849 const enum bfd_endian dwarf5_byte_order
26850 = gdbarch_byte_order (get_objfile_arch (objfile));
26852 /* The CU list is already sorted, so we don't need to do additional
26853 work here. Also, the debug_types entries do not appear in
26854 all_comp_units, but only in their own hash table. */
26856 debug_names nametable (dwarf2_per_objfile, dwarf5_is_dwarf64,
26857 dwarf5_byte_order);
26858 std::unordered_set<partial_symbol *>
26859 psyms_seen (psyms_seen_size (dwarf2_per_objfile));
26860 for (int i = 0; i < dwarf2_per_objfile->n_comp_units; ++i)
26862 const dwarf2_per_cu_data *per_cu = dwarf2_per_objfile->all_comp_units[i];
26863 partial_symtab *psymtab = per_cu->v.psymtab;
26865 /* CU of a shared file from 'dwz -m' may be unused by this main
26866 file. It may be referenced from a local scope but in such
26867 case it does not need to be present in .debug_names. */
26868 if (psymtab == NULL)
26871 if (psymtab->user == NULL)
26872 nametable.recursively_write_psymbols (objfile, psymtab, psyms_seen, i);
26874 cu_list.append_uint (nametable.dwarf5_offset_size (), dwarf5_byte_order,
26875 to_underlying (per_cu->sect_off));
26878 /* Write out the .debug_type entries, if any. */
26879 data_buf types_cu_list;
26880 if (dwarf2_per_objfile->signatured_types)
26882 debug_names::write_one_signatured_type_data sig_data (nametable,
26883 signatured_type_index_data (types_cu_list, psyms_seen));
26885 sig_data.info.objfile = objfile;
26886 /* It is used only for gdb_index. */
26887 sig_data.info.symtab = nullptr;
26888 sig_data.info.cu_index = 0;
26889 htab_traverse_noresize (dwarf2_per_objfile->signatured_types,
26890 debug_names::write_one_signatured_type,
26894 nametable.build ();
26896 /* No addr_vec - DWARF-5 uses .debug_aranges generated by GCC. */
26898 const offset_type bytes_of_header
26899 = ((dwarf5_is_dwarf64 ? 12 : 4)
26901 + sizeof (dwarf5_gdb_augmentation));
26902 size_t expected_bytes = 0;
26903 expected_bytes += bytes_of_header;
26904 expected_bytes += cu_list.size ();
26905 expected_bytes += types_cu_list.size ();
26906 expected_bytes += nametable.bytes ();
26909 if (!dwarf5_is_dwarf64)
26911 const uint64_t size64 = expected_bytes - 4;
26912 gdb_assert (size64 < 0xfffffff0);
26913 header.append_uint (4, dwarf5_byte_order, size64);
26917 header.append_uint (4, dwarf5_byte_order, 0xffffffff);
26918 header.append_uint (8, dwarf5_byte_order, expected_bytes - 12);
26921 /* The version number. */
26922 header.append_uint (2, dwarf5_byte_order, 5);
26925 header.append_uint (2, dwarf5_byte_order, 0);
26927 /* comp_unit_count - The number of CUs in the CU list. */
26928 header.append_uint (4, dwarf5_byte_order, dwarf2_per_objfile->n_comp_units);
26930 /* local_type_unit_count - The number of TUs in the local TU
26932 header.append_uint (4, dwarf5_byte_order, dwarf2_per_objfile->n_type_units);
26934 /* foreign_type_unit_count - The number of TUs in the foreign TU
26936 header.append_uint (4, dwarf5_byte_order, 0);
26938 /* bucket_count - The number of hash buckets in the hash lookup
26940 header.append_uint (4, dwarf5_byte_order, nametable.bucket_count ());
26942 /* name_count - The number of unique names in the index. */
26943 header.append_uint (4, dwarf5_byte_order, nametable.name_count ());
26945 /* abbrev_table_size - The size in bytes of the abbreviations
26947 header.append_uint (4, dwarf5_byte_order, nametable.abbrev_table_bytes ());
26949 /* augmentation_string_size - The size in bytes of the augmentation
26950 string. This value is rounded up to a multiple of 4. */
26951 static_assert (sizeof (dwarf5_gdb_augmentation) % 4 == 0, "");
26952 header.append_uint (4, dwarf5_byte_order, sizeof (dwarf5_gdb_augmentation));
26953 header.append_data (dwarf5_gdb_augmentation);
26955 gdb_assert (header.size () == bytes_of_header);
26957 header.file_write (out_file);
26958 cu_list.file_write (out_file);
26959 types_cu_list.file_write (out_file);
26960 nametable.file_write (out_file, out_file_str);
26962 return expected_bytes;
26965 /* Assert that FILE's size is EXPECTED_SIZE. Assumes file's seek
26966 position is at the end of the file. */
26969 assert_file_size (FILE *file, const char *filename, size_t expected_size)
26971 const auto file_size = ftell (file);
26972 if (file_size == -1)
26973 error (_("Can't get `%s' size"), filename);
26974 gdb_assert (file_size == expected_size);
26977 /* Create an index file for OBJFILE in the directory DIR. */
26980 write_psymtabs_to_index (struct dwarf2_per_objfile *dwarf2_per_objfile,
26982 dw_index_kind index_kind)
26984 struct objfile *objfile = dwarf2_per_objfile->objfile;
26986 if (dwarf2_per_objfile->using_index)
26987 error (_("Cannot use an index to create the index"));
26989 if (VEC_length (dwarf2_section_info_def, dwarf2_per_objfile->types) > 1)
26990 error (_("Cannot make an index when the file has multiple .debug_types sections"));
26992 if (!objfile->psymtabs || !objfile->psymtabs_addrmap)
26996 if (stat (objfile_name (objfile), &st) < 0)
26997 perror_with_name (objfile_name (objfile));
26999 std::string filename (std::string (dir) + SLASH_STRING
27000 + lbasename (objfile_name (objfile))
27001 + (index_kind == dw_index_kind::DEBUG_NAMES
27002 ? INDEX5_SUFFIX : INDEX4_SUFFIX));
27004 FILE *out_file = gdb_fopen_cloexec (filename.c_str (), "wb").release ();
27006 error (_("Can't open `%s' for writing"), filename.c_str ());
27008 /* Order matters here; we want FILE to be closed before FILENAME is
27009 unlinked, because on MS-Windows one cannot delete a file that is
27010 still open. (Don't call anything here that might throw until
27011 file_closer is created.) */
27012 gdb::unlinker unlink_file (filename.c_str ());
27013 gdb_file_up close_out_file (out_file);
27015 if (index_kind == dw_index_kind::DEBUG_NAMES)
27017 std::string filename_str (std::string (dir) + SLASH_STRING
27018 + lbasename (objfile_name (objfile))
27019 + DEBUG_STR_SUFFIX);
27021 = gdb_fopen_cloexec (filename_str.c_str (), "wb").release ();
27023 error (_("Can't open `%s' for writing"), filename_str.c_str ());
27024 gdb::unlinker unlink_file_str (filename_str.c_str ());
27025 gdb_file_up close_out_file_str (out_file_str);
27027 const size_t total_len
27028 = write_debug_names (dwarf2_per_objfile, out_file, out_file_str);
27029 assert_file_size (out_file, filename.c_str (), total_len);
27031 /* We want to keep the file .debug_str file too. */
27032 unlink_file_str.keep ();
27036 const size_t total_len
27037 = write_gdbindex (dwarf2_per_objfile, out_file);
27038 assert_file_size (out_file, filename.c_str (), total_len);
27041 /* We want to keep the file. */
27042 unlink_file.keep ();
27045 /* Implementation of the `save gdb-index' command.
27047 Note that the .gdb_index file format used by this command is
27048 documented in the GDB manual. Any changes here must be documented
27052 save_gdb_index_command (const char *arg, int from_tty)
27054 struct objfile *objfile;
27055 const char dwarf5space[] = "-dwarf-5 ";
27056 dw_index_kind index_kind = dw_index_kind::GDB_INDEX;
27061 arg = skip_spaces (arg);
27062 if (strncmp (arg, dwarf5space, strlen (dwarf5space)) == 0)
27064 index_kind = dw_index_kind::DEBUG_NAMES;
27065 arg += strlen (dwarf5space);
27066 arg = skip_spaces (arg);
27070 error (_("usage: save gdb-index [-dwarf-5] DIRECTORY"));
27072 ALL_OBJFILES (objfile)
27076 /* If the objfile does not correspond to an actual file, skip it. */
27077 if (stat (objfile_name (objfile), &st) < 0)
27080 struct dwarf2_per_objfile *dwarf2_per_objfile
27081 = get_dwarf2_per_objfile (objfile);
27083 if (dwarf2_per_objfile != NULL)
27087 write_psymtabs_to_index (dwarf2_per_objfile, arg, index_kind);
27089 CATCH (except, RETURN_MASK_ERROR)
27091 exception_fprintf (gdb_stderr, except,
27092 _("Error while writing index for `%s': "),
27093 objfile_name (objfile));
27103 int dwarf_always_disassemble;
27106 show_dwarf_always_disassemble (struct ui_file *file, int from_tty,
27107 struct cmd_list_element *c, const char *value)
27109 fprintf_filtered (file,
27110 _("Whether to always disassemble "
27111 "DWARF expressions is %s.\n"),
27116 show_check_physname (struct ui_file *file, int from_tty,
27117 struct cmd_list_element *c, const char *value)
27119 fprintf_filtered (file,
27120 _("Whether to check \"physname\" is %s.\n"),
27125 _initialize_dwarf2_read (void)
27127 struct cmd_list_element *c;
27129 dwarf2_objfile_data_key = register_objfile_data ();
27131 add_prefix_cmd ("dwarf", class_maintenance, set_dwarf_cmd, _("\
27132 Set DWARF specific variables.\n\
27133 Configure DWARF variables such as the cache size"),
27134 &set_dwarf_cmdlist, "maintenance set dwarf ",
27135 0/*allow-unknown*/, &maintenance_set_cmdlist);
27137 add_prefix_cmd ("dwarf", class_maintenance, show_dwarf_cmd, _("\
27138 Show DWARF specific variables\n\
27139 Show DWARF variables such as the cache size"),
27140 &show_dwarf_cmdlist, "maintenance show dwarf ",
27141 0/*allow-unknown*/, &maintenance_show_cmdlist);
27143 add_setshow_zinteger_cmd ("max-cache-age", class_obscure,
27144 &dwarf_max_cache_age, _("\
27145 Set the upper bound on the age of cached DWARF compilation units."), _("\
27146 Show the upper bound on the age of cached DWARF compilation units."), _("\
27147 A higher limit means that cached compilation units will be stored\n\
27148 in memory longer, and more total memory will be used. Zero disables\n\
27149 caching, which can slow down startup."),
27151 show_dwarf_max_cache_age,
27152 &set_dwarf_cmdlist,
27153 &show_dwarf_cmdlist);
27155 add_setshow_boolean_cmd ("always-disassemble", class_obscure,
27156 &dwarf_always_disassemble, _("\
27157 Set whether `info address' always disassembles DWARF expressions."), _("\
27158 Show whether `info address' always disassembles DWARF expressions."), _("\
27159 When enabled, DWARF expressions are always printed in an assembly-like\n\
27160 syntax. When disabled, expressions will be printed in a more\n\
27161 conversational style, when possible."),
27163 show_dwarf_always_disassemble,
27164 &set_dwarf_cmdlist,
27165 &show_dwarf_cmdlist);
27167 add_setshow_zuinteger_cmd ("dwarf-read", no_class, &dwarf_read_debug, _("\
27168 Set debugging of the DWARF reader."), _("\
27169 Show debugging of the DWARF reader."), _("\
27170 When enabled (non-zero), debugging messages are printed during DWARF\n\
27171 reading and symtab expansion. A value of 1 (one) provides basic\n\
27172 information. A value greater than 1 provides more verbose information."),
27175 &setdebuglist, &showdebuglist);
27177 add_setshow_zuinteger_cmd ("dwarf-die", no_class, &dwarf_die_debug, _("\
27178 Set debugging of the DWARF DIE reader."), _("\
27179 Show debugging of the DWARF DIE reader."), _("\
27180 When enabled (non-zero), DIEs are dumped after they are read in.\n\
27181 The value is the maximum depth to print."),
27184 &setdebuglist, &showdebuglist);
27186 add_setshow_zuinteger_cmd ("dwarf-line", no_class, &dwarf_line_debug, _("\
27187 Set debugging of the dwarf line reader."), _("\
27188 Show debugging of the dwarf line reader."), _("\
27189 When enabled (non-zero), line number entries are dumped as they are read in.\n\
27190 A value of 1 (one) provides basic information.\n\
27191 A value greater than 1 provides more verbose information."),
27194 &setdebuglist, &showdebuglist);
27196 add_setshow_boolean_cmd ("check-physname", no_class, &check_physname, _("\
27197 Set cross-checking of \"physname\" code against demangler."), _("\
27198 Show cross-checking of \"physname\" code against demangler."), _("\
27199 When enabled, GDB's internal \"physname\" code is checked against\n\
27201 NULL, show_check_physname,
27202 &setdebuglist, &showdebuglist);
27204 add_setshow_boolean_cmd ("use-deprecated-index-sections",
27205 no_class, &use_deprecated_index_sections, _("\
27206 Set whether to use deprecated gdb_index sections."), _("\
27207 Show whether to use deprecated gdb_index sections."), _("\
27208 When enabled, deprecated .gdb_index sections are used anyway.\n\
27209 Normally they are ignored either because of a missing feature or\n\
27210 performance issue.\n\
27211 Warning: This option must be enabled before gdb reads the file."),
27214 &setlist, &showlist);
27216 c = add_cmd ("gdb-index", class_files, save_gdb_index_command,
27218 Save a gdb-index file.\n\
27219 Usage: save gdb-index [-dwarf-5] DIRECTORY\n\
27221 No options create one file with .gdb-index extension for pre-DWARF-5\n\
27222 compatible .gdb_index section. With -dwarf-5 creates two files with\n\
27223 extension .debug_names and .debug_str for DWARF-5 .debug_names section."),
27225 set_cmd_completer (c, filename_completer);
27227 dwarf2_locexpr_index = register_symbol_computed_impl (LOC_COMPUTED,
27228 &dwarf2_locexpr_funcs);
27229 dwarf2_loclist_index = register_symbol_computed_impl (LOC_COMPUTED,
27230 &dwarf2_loclist_funcs);
27232 dwarf2_locexpr_block_index = register_symbol_block_impl (LOC_BLOCK,
27233 &dwarf2_block_frame_base_locexpr_funcs);
27234 dwarf2_loclist_block_index = register_symbol_block_impl (LOC_BLOCK,
27235 &dwarf2_block_frame_base_loclist_funcs);
27238 selftests::register_test ("dw2_expand_symtabs_matching",
27239 selftests::dw2_expand_symtabs_matching::run_test);