1 /* DWARF 2 debugging format support for GDB.
3 Copyright (C) 1994-2019 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. */
32 #include "dwarf2read.h"
33 #include "dwarf-index-cache.h"
34 #include "dwarf-index-common.h"
43 #include "gdb-demangle.h"
44 #include "expression.h"
45 #include "filenames.h" /* for DOSish file names */
48 #include "complaints.h"
49 #include "dwarf2expr.h"
50 #include "dwarf2loc.h"
51 #include "cp-support.h"
57 #include "typeprint.h"
60 #include "completer.h"
61 #include "common/vec.h"
65 #include "gdbcore.h" /* for gnutarget */
66 #include "gdb/gdb-index.h"
71 #include "common/filestuff.h"
73 #include "namespace.h"
74 #include "common/gdb_unlinker.h"
75 #include "common/function-view.h"
76 #include "common/gdb_optional.h"
77 #include "common/underlying.h"
78 #include "common/byte-vector.h"
79 #include "common/hash_enum.h"
80 #include "filename-seen-cache.h"
83 #include <sys/types.h>
85 #include <unordered_set>
86 #include <unordered_map>
87 #include "common/selftest.h"
90 #include <forward_list>
91 #include "rust-lang.h"
92 #include "common/pathstuff.h"
94 /* When == 1, print basic high level tracing messages.
95 When > 1, be more verbose.
96 This is in contrast to the low level DIE reading of dwarf_die_debug. */
97 static unsigned int dwarf_read_debug = 0;
99 /* When non-zero, dump DIEs after they are read in. */
100 static unsigned int dwarf_die_debug = 0;
102 /* When non-zero, dump line number entries as they are read in. */
103 static unsigned int dwarf_line_debug = 0;
105 /* When non-zero, cross-check physname against demangler. */
106 static int check_physname = 0;
108 /* When non-zero, do not reject deprecated .gdb_index sections. */
109 static int use_deprecated_index_sections = 0;
111 static const struct objfile_data *dwarf2_objfile_data_key;
113 /* The "aclass" indices for various kinds of computed DWARF symbols. */
115 static int dwarf2_locexpr_index;
116 static int dwarf2_loclist_index;
117 static int dwarf2_locexpr_block_index;
118 static int dwarf2_loclist_block_index;
120 /* An index into a (C++) symbol name component in a symbol name as
121 recorded in the mapped_index's symbol table. For each C++ symbol
122 in the symbol table, we record one entry for the start of each
123 component in the symbol in a table of name components, and then
124 sort the table, in order to be able to binary search symbol names,
125 ignoring leading namespaces, both completion and regular look up.
126 For example, for symbol "A::B::C", we'll have an entry that points
127 to "A::B::C", another that points to "B::C", and another for "C".
128 Note that function symbols in GDB index have no parameter
129 information, just the function/method names. You can convert a
130 name_component to a "const char *" using the
131 'mapped_index::symbol_name_at(offset_type)' method. */
133 struct name_component
135 /* Offset in the symbol name where the component starts. Stored as
136 a (32-bit) offset instead of a pointer to save memory and improve
137 locality on 64-bit architectures. */
138 offset_type name_offset;
140 /* The symbol's index in the symbol and constant pool tables of a
145 /* Base class containing bits shared by both .gdb_index and
146 .debug_name indexes. */
148 struct mapped_index_base
150 mapped_index_base () = default;
151 DISABLE_COPY_AND_ASSIGN (mapped_index_base);
153 /* The name_component table (a sorted vector). See name_component's
154 description above. */
155 std::vector<name_component> name_components;
157 /* How NAME_COMPONENTS is sorted. */
158 enum case_sensitivity name_components_casing;
160 /* Return the number of names in the symbol table. */
161 virtual size_t symbol_name_count () const = 0;
163 /* Get the name of the symbol at IDX in the symbol table. */
164 virtual const char *symbol_name_at (offset_type idx) const = 0;
166 /* Return whether the name at IDX in the symbol table should be
168 virtual bool symbol_name_slot_invalid (offset_type idx) const
173 /* Build the symbol name component sorted vector, if we haven't
175 void build_name_components ();
177 /* Returns the lower (inclusive) and upper (exclusive) bounds of the
178 possible matches for LN_NO_PARAMS in the name component
180 std::pair<std::vector<name_component>::const_iterator,
181 std::vector<name_component>::const_iterator>
182 find_name_components_bounds (const lookup_name_info &ln_no_params) const;
184 /* Prevent deleting/destroying via a base class pointer. */
186 ~mapped_index_base() = default;
189 /* A description of the mapped index. The file format is described in
190 a comment by the code that writes the index. */
191 struct mapped_index final : public mapped_index_base
193 /* A slot/bucket in the symbol table hash. */
194 struct symbol_table_slot
196 const offset_type name;
197 const offset_type vec;
200 /* Index data format version. */
203 /* The address table data. */
204 gdb::array_view<const gdb_byte> address_table;
206 /* The symbol table, implemented as a hash table. */
207 gdb::array_view<symbol_table_slot> symbol_table;
209 /* A pointer to the constant pool. */
210 const char *constant_pool = nullptr;
212 bool symbol_name_slot_invalid (offset_type idx) const override
214 const auto &bucket = this->symbol_table[idx];
215 return bucket.name == 0 && bucket.vec;
218 /* Convenience method to get at the name of the symbol at IDX in the
220 const char *symbol_name_at (offset_type idx) const override
221 { return this->constant_pool + MAYBE_SWAP (this->symbol_table[idx].name); }
223 size_t symbol_name_count () const override
224 { return this->symbol_table.size (); }
227 /* A description of the mapped .debug_names.
228 Uninitialized map has CU_COUNT 0. */
229 struct mapped_debug_names final : public mapped_index_base
231 mapped_debug_names (struct dwarf2_per_objfile *dwarf2_per_objfile_)
232 : dwarf2_per_objfile (dwarf2_per_objfile_)
235 struct dwarf2_per_objfile *dwarf2_per_objfile;
236 bfd_endian dwarf5_byte_order;
237 bool dwarf5_is_dwarf64;
238 bool augmentation_is_gdb;
240 uint32_t cu_count = 0;
241 uint32_t tu_count, bucket_count, name_count;
242 const gdb_byte *cu_table_reordered, *tu_table_reordered;
243 const uint32_t *bucket_table_reordered, *hash_table_reordered;
244 const gdb_byte *name_table_string_offs_reordered;
245 const gdb_byte *name_table_entry_offs_reordered;
246 const gdb_byte *entry_pool;
253 /* Attribute name DW_IDX_*. */
256 /* Attribute form DW_FORM_*. */
259 /* Value if FORM is DW_FORM_implicit_const. */
260 LONGEST implicit_const;
262 std::vector<attr> attr_vec;
265 std::unordered_map<ULONGEST, index_val> abbrev_map;
267 const char *namei_to_name (uint32_t namei) const;
269 /* Implementation of the mapped_index_base virtual interface, for
270 the name_components cache. */
272 const char *symbol_name_at (offset_type idx) const override
273 { return namei_to_name (idx); }
275 size_t symbol_name_count () const override
276 { return this->name_count; }
279 /* See dwarf2read.h. */
282 get_dwarf2_per_objfile (struct objfile *objfile)
284 return ((struct dwarf2_per_objfile *)
285 objfile_data (objfile, dwarf2_objfile_data_key));
288 /* Set the dwarf2_per_objfile associated to OBJFILE. */
291 set_dwarf2_per_objfile (struct objfile *objfile,
292 struct dwarf2_per_objfile *dwarf2_per_objfile)
294 gdb_assert (get_dwarf2_per_objfile (objfile) == NULL);
295 set_objfile_data (objfile, dwarf2_objfile_data_key, dwarf2_per_objfile);
298 /* Default names of the debugging sections. */
300 /* Note that if the debugging section has been compressed, it might
301 have a name like .zdebug_info. */
303 static const struct dwarf2_debug_sections dwarf2_elf_names =
305 { ".debug_info", ".zdebug_info" },
306 { ".debug_abbrev", ".zdebug_abbrev" },
307 { ".debug_line", ".zdebug_line" },
308 { ".debug_loc", ".zdebug_loc" },
309 { ".debug_loclists", ".zdebug_loclists" },
310 { ".debug_macinfo", ".zdebug_macinfo" },
311 { ".debug_macro", ".zdebug_macro" },
312 { ".debug_str", ".zdebug_str" },
313 { ".debug_line_str", ".zdebug_line_str" },
314 { ".debug_ranges", ".zdebug_ranges" },
315 { ".debug_rnglists", ".zdebug_rnglists" },
316 { ".debug_types", ".zdebug_types" },
317 { ".debug_addr", ".zdebug_addr" },
318 { ".debug_frame", ".zdebug_frame" },
319 { ".eh_frame", NULL },
320 { ".gdb_index", ".zgdb_index" },
321 { ".debug_names", ".zdebug_names" },
322 { ".debug_aranges", ".zdebug_aranges" },
326 /* List of DWO/DWP sections. */
328 static const struct dwop_section_names
330 struct dwarf2_section_names abbrev_dwo;
331 struct dwarf2_section_names info_dwo;
332 struct dwarf2_section_names line_dwo;
333 struct dwarf2_section_names loc_dwo;
334 struct dwarf2_section_names loclists_dwo;
335 struct dwarf2_section_names macinfo_dwo;
336 struct dwarf2_section_names macro_dwo;
337 struct dwarf2_section_names str_dwo;
338 struct dwarf2_section_names str_offsets_dwo;
339 struct dwarf2_section_names types_dwo;
340 struct dwarf2_section_names cu_index;
341 struct dwarf2_section_names tu_index;
345 { ".debug_abbrev.dwo", ".zdebug_abbrev.dwo" },
346 { ".debug_info.dwo", ".zdebug_info.dwo" },
347 { ".debug_line.dwo", ".zdebug_line.dwo" },
348 { ".debug_loc.dwo", ".zdebug_loc.dwo" },
349 { ".debug_loclists.dwo", ".zdebug_loclists.dwo" },
350 { ".debug_macinfo.dwo", ".zdebug_macinfo.dwo" },
351 { ".debug_macro.dwo", ".zdebug_macro.dwo" },
352 { ".debug_str.dwo", ".zdebug_str.dwo" },
353 { ".debug_str_offsets.dwo", ".zdebug_str_offsets.dwo" },
354 { ".debug_types.dwo", ".zdebug_types.dwo" },
355 { ".debug_cu_index", ".zdebug_cu_index" },
356 { ".debug_tu_index", ".zdebug_tu_index" },
359 /* local data types */
361 /* The data in a compilation unit header, after target2host
362 translation, looks like this. */
363 struct comp_unit_head
367 unsigned char addr_size;
368 unsigned char signed_addr_p;
369 sect_offset abbrev_sect_off;
371 /* Size of file offsets; either 4 or 8. */
372 unsigned int offset_size;
374 /* Size of the length field; either 4 or 12. */
375 unsigned int initial_length_size;
377 enum dwarf_unit_type unit_type;
379 /* Offset to the first byte of this compilation unit header in the
380 .debug_info section, for resolving relative reference dies. */
381 sect_offset sect_off;
383 /* Offset to first die in this cu from the start of the cu.
384 This will be the first byte following the compilation unit header. */
385 cu_offset first_die_cu_offset;
387 /* 64-bit signature of this type unit - it is valid only for
388 UNIT_TYPE DW_UT_type. */
391 /* For types, offset in the type's DIE of the type defined by this TU. */
392 cu_offset type_cu_offset_in_tu;
395 /* Type used for delaying computation of method physnames.
396 See comments for compute_delayed_physnames. */
397 struct delayed_method_info
399 /* The type to which the method is attached, i.e., its parent class. */
402 /* The index of the method in the type's function fieldlists. */
405 /* The index of the method in the fieldlist. */
408 /* The name of the DIE. */
411 /* The DIE associated with this method. */
412 struct die_info *die;
415 /* Internal state when decoding a particular compilation unit. */
418 explicit dwarf2_cu (struct dwarf2_per_cu_data *per_cu);
421 DISABLE_COPY_AND_ASSIGN (dwarf2_cu);
423 /* TU version of handle_DW_AT_stmt_list for read_type_unit_scope.
424 Create the set of symtabs used by this TU, or if this TU is sharing
425 symtabs with another TU and the symtabs have already been created
426 then restore those symtabs in the line header.
427 We don't need the pc/line-number mapping for type units. */
428 void setup_type_unit_groups (struct die_info *die);
430 /* Start a symtab for DWARF. NAME, COMP_DIR, LOW_PC are passed to the
431 buildsym_compunit constructor. */
432 struct compunit_symtab *start_symtab (const char *name,
433 const char *comp_dir,
436 /* Reset the builder. */
437 void reset_builder () { m_builder.reset (); }
439 /* The header of the compilation unit. */
440 struct comp_unit_head header {};
442 /* Base address of this compilation unit. */
443 CORE_ADDR base_address = 0;
445 /* Non-zero if base_address has been set. */
448 /* The language we are debugging. */
449 enum language language = language_unknown;
450 const struct language_defn *language_defn = nullptr;
452 const char *producer = nullptr;
455 /* The symtab builder for this CU. This is only non-NULL when full
456 symbols are being read. */
457 std::unique_ptr<buildsym_compunit> m_builder;
460 /* The generic symbol table building routines have separate lists for
461 file scope symbols and all all other scopes (local scopes). So
462 we need to select the right one to pass to add_symbol_to_list().
463 We do it by keeping a pointer to the correct list in list_in_scope.
465 FIXME: The original dwarf code just treated the file scope as the
466 first local scope, and all other local scopes as nested local
467 scopes, and worked fine. Check to see if we really need to
468 distinguish these in buildsym.c. */
469 struct pending **list_in_scope = nullptr;
471 /* Hash table holding all the loaded partial DIEs
472 with partial_die->offset.SECT_OFF as hash. */
473 htab_t partial_dies = nullptr;
475 /* Storage for things with the same lifetime as this read-in compilation
476 unit, including partial DIEs. */
477 auto_obstack comp_unit_obstack;
479 /* When multiple dwarf2_cu structures are living in memory, this field
480 chains them all together, so that they can be released efficiently.
481 We will probably also want a generation counter so that most-recently-used
482 compilation units are cached... */
483 struct dwarf2_per_cu_data *read_in_chain = nullptr;
485 /* Backlink to our per_cu entry. */
486 struct dwarf2_per_cu_data *per_cu;
488 /* How many compilation units ago was this CU last referenced? */
491 /* A hash table of DIE cu_offset for following references with
492 die_info->offset.sect_off as hash. */
493 htab_t die_hash = nullptr;
495 /* Full DIEs if read in. */
496 struct die_info *dies = nullptr;
498 /* A set of pointers to dwarf2_per_cu_data objects for compilation
499 units referenced by this one. Only set during full symbol processing;
500 partial symbol tables do not have dependencies. */
501 htab_t dependencies = nullptr;
503 /* Header data from the line table, during full symbol processing. */
504 struct line_header *line_header = nullptr;
505 /* Non-NULL if LINE_HEADER is owned by this DWARF_CU. Otherwise,
506 it's owned by dwarf2_per_objfile::line_header_hash. If non-NULL,
507 this is the DW_TAG_compile_unit die for this CU. We'll hold on
508 to the line header as long as this DIE is being processed. See
509 process_die_scope. */
510 die_info *line_header_die_owner = nullptr;
512 /* A list of methods which need to have physnames computed
513 after all type information has been read. */
514 std::vector<delayed_method_info> method_list;
516 /* To be copied to symtab->call_site_htab. */
517 htab_t call_site_htab = nullptr;
519 /* Non-NULL if this CU came from a DWO file.
520 There is an invariant here that is important to remember:
521 Except for attributes copied from the top level DIE in the "main"
522 (or "stub") file in preparation for reading the DWO file
523 (e.g., DW_AT_GNU_addr_base), we KISS: there is only *one* CU.
524 Either there isn't a DWO file (in which case this is NULL and the point
525 is moot), or there is and either we're not going to read it (in which
526 case this is NULL) or there is and we are reading it (in which case this
528 struct dwo_unit *dwo_unit = nullptr;
530 /* The DW_AT_addr_base attribute if present, zero otherwise
531 (zero is a valid value though).
532 Note this value comes from the Fission stub CU/TU's DIE. */
533 ULONGEST addr_base = 0;
535 /* The DW_AT_ranges_base attribute if present, zero otherwise
536 (zero is a valid value though).
537 Note this value comes from the Fission stub CU/TU's DIE.
538 Also note that the value is zero in the non-DWO case so this value can
539 be used without needing to know whether DWO files are in use or not.
540 N.B. This does not apply to DW_AT_ranges appearing in
541 DW_TAG_compile_unit dies. This is a bit of a wart, consider if ever
542 DW_AT_ranges appeared in the DW_TAG_compile_unit of DWO DIEs: then
543 DW_AT_ranges_base *would* have to be applied, and we'd have to care
544 whether the DW_AT_ranges attribute came from the skeleton or DWO. */
545 ULONGEST ranges_base = 0;
547 /* When reading debug info generated by older versions of rustc, we
548 have to rewrite some union types to be struct types with a
549 variant part. This rewriting must be done after the CU is fully
550 read in, because otherwise at the point of rewriting some struct
551 type might not have been fully processed. So, we keep a list of
552 all such types here and process them after expansion. */
553 std::vector<struct type *> rust_unions;
555 /* Mark used when releasing cached dies. */
558 /* This CU references .debug_loc. See the symtab->locations_valid field.
559 This test is imperfect as there may exist optimized debug code not using
560 any location list and still facing inlining issues if handled as
561 unoptimized code. For a future better test see GCC PR other/32998. */
562 bool has_loclist : 1;
564 /* These cache the results for producer_is_* fields. CHECKED_PRODUCER is true
565 if all the producer_is_* fields are valid. This information is cached
566 because profiling CU expansion showed excessive time spent in
567 producer_is_gxx_lt_4_6. */
568 bool checked_producer : 1;
569 bool producer_is_gxx_lt_4_6 : 1;
570 bool producer_is_gcc_lt_4_3 : 1;
571 bool producer_is_icc : 1;
572 bool producer_is_icc_lt_14 : 1;
573 bool producer_is_codewarrior : 1;
575 /* When true, the file that we're processing is known to have
576 debugging info for C++ namespaces. GCC 3.3.x did not produce
577 this information, but later versions do. */
579 bool processing_has_namespace_info : 1;
581 struct partial_die_info *find_partial_die (sect_offset sect_off);
583 /* If this CU was inherited by another CU (via specification,
584 abstract_origin, etc), this is the ancestor CU. */
587 /* Get the buildsym_compunit for this CU. */
588 buildsym_compunit *get_builder ()
590 /* If this CU has a builder associated with it, use that. */
591 if (m_builder != nullptr)
592 return m_builder.get ();
594 /* Otherwise, search ancestors for a valid builder. */
595 if (ancestor != nullptr)
596 return ancestor->get_builder ();
602 /* A struct that can be used as a hash key for tables based on DW_AT_stmt_list.
603 This includes type_unit_group and quick_file_names. */
605 struct stmt_list_hash
607 /* The DWO unit this table is from or NULL if there is none. */
608 struct dwo_unit *dwo_unit;
610 /* Offset in .debug_line or .debug_line.dwo. */
611 sect_offset line_sect_off;
614 /* Each element of dwarf2_per_objfile->type_unit_groups is a pointer to
615 an object of this type. */
617 struct type_unit_group
619 /* dwarf2read.c's main "handle" on a TU symtab.
620 To simplify things we create an artificial CU that "includes" all the
621 type units using this stmt_list so that the rest of the code still has
622 a "per_cu" handle on the symtab.
623 This PER_CU is recognized by having no section. */
624 #define IS_TYPE_UNIT_GROUP(per_cu) ((per_cu)->section == NULL)
625 struct dwarf2_per_cu_data per_cu;
627 /* The TUs that share this DW_AT_stmt_list entry.
628 This is added to while parsing type units to build partial symtabs,
629 and is deleted afterwards and not used again. */
630 VEC (sig_type_ptr) *tus;
632 /* The compunit symtab.
633 Type units in a group needn't all be defined in the same source file,
634 so we create an essentially anonymous symtab as the compunit symtab. */
635 struct compunit_symtab *compunit_symtab;
637 /* The data used to construct the hash key. */
638 struct stmt_list_hash hash;
640 /* The number of symtabs from the line header.
641 The value here must match line_header.num_file_names. */
642 unsigned int num_symtabs;
644 /* The symbol tables for this TU (obtained from the files listed in
646 WARNING: The order of entries here must match the order of entries
647 in the line header. After the first TU using this type_unit_group, the
648 line header for the subsequent TUs is recreated from this. This is done
649 because we need to use the same symtabs for each TU using the same
650 DW_AT_stmt_list value. Also note that symtabs may be repeated here,
651 there's no guarantee the line header doesn't have duplicate entries. */
652 struct symtab **symtabs;
655 /* These sections are what may appear in a (real or virtual) DWO file. */
659 struct dwarf2_section_info abbrev;
660 struct dwarf2_section_info line;
661 struct dwarf2_section_info loc;
662 struct dwarf2_section_info loclists;
663 struct dwarf2_section_info macinfo;
664 struct dwarf2_section_info macro;
665 struct dwarf2_section_info str;
666 struct dwarf2_section_info str_offsets;
667 /* In the case of a virtual DWO file, these two are unused. */
668 struct dwarf2_section_info info;
669 VEC (dwarf2_section_info_def) *types;
672 /* CUs/TUs in DWP/DWO files. */
676 /* Backlink to the containing struct dwo_file. */
677 struct dwo_file *dwo_file;
679 /* The "id" that distinguishes this CU/TU.
680 .debug_info calls this "dwo_id", .debug_types calls this "signature".
681 Since signatures came first, we stick with it for consistency. */
684 /* The section this CU/TU lives in, in the DWO file. */
685 struct dwarf2_section_info *section;
687 /* Same as dwarf2_per_cu_data:{sect_off,length} but in the DWO section. */
688 sect_offset sect_off;
691 /* For types, offset in the type's DIE of the type defined by this TU. */
692 cu_offset type_offset_in_tu;
695 /* include/dwarf2.h defines the DWP section codes.
696 It defines a max value but it doesn't define a min value, which we
697 use for error checking, so provide one. */
699 enum dwp_v2_section_ids
704 /* Data for one DWO file.
706 This includes virtual DWO files (a virtual DWO file is a DWO file as it
707 appears in a DWP file). DWP files don't really have DWO files per se -
708 comdat folding of types "loses" the DWO file they came from, and from
709 a high level view DWP files appear to contain a mass of random types.
710 However, to maintain consistency with the non-DWP case we pretend DWP
711 files contain virtual DWO files, and we assign each TU with one virtual
712 DWO file (generally based on the line and abbrev section offsets -
713 a heuristic that seems to work in practice). */
717 /* The DW_AT_GNU_dwo_name attribute.
718 For virtual DWO files the name is constructed from the section offsets
719 of abbrev,line,loc,str_offsets so that we combine virtual DWO files
720 from related CU+TUs. */
721 const char *dwo_name;
723 /* The DW_AT_comp_dir attribute. */
724 const char *comp_dir;
726 /* The bfd, when the file is open. Otherwise this is NULL.
727 This is unused(NULL) for virtual DWO files where we use dwp_file.dbfd. */
730 /* The sections that make up this DWO file.
731 Remember that for virtual DWO files in DWP V2, these are virtual
732 sections (for lack of a better name). */
733 struct dwo_sections sections;
735 /* The CUs in the file.
736 Each element is a struct dwo_unit. Multiple CUs per DWO are supported as
737 an extension to handle LLVM's Link Time Optimization output (where
738 multiple source files may be compiled into a single object/dwo pair). */
741 /* Table of TUs in the file.
742 Each element is a struct dwo_unit. */
746 /* These sections are what may appear in a DWP file. */
750 /* These are used by both DWP version 1 and 2. */
751 struct dwarf2_section_info str;
752 struct dwarf2_section_info cu_index;
753 struct dwarf2_section_info tu_index;
755 /* These are only used by DWP version 2 files.
756 In DWP version 1 the .debug_info.dwo, .debug_types.dwo, and other
757 sections are referenced by section number, and are not recorded here.
758 In DWP version 2 there is at most one copy of all these sections, each
759 section being (effectively) comprised of the concatenation of all of the
760 individual sections that exist in the version 1 format.
761 To keep the code simple we treat each of these concatenated pieces as a
762 section itself (a virtual section?). */
763 struct dwarf2_section_info abbrev;
764 struct dwarf2_section_info info;
765 struct dwarf2_section_info line;
766 struct dwarf2_section_info loc;
767 struct dwarf2_section_info macinfo;
768 struct dwarf2_section_info macro;
769 struct dwarf2_section_info str_offsets;
770 struct dwarf2_section_info types;
773 /* These sections are what may appear in a virtual DWO file in DWP version 1.
774 A virtual DWO file is a DWO file as it appears in a DWP file. */
776 struct virtual_v1_dwo_sections
778 struct dwarf2_section_info abbrev;
779 struct dwarf2_section_info line;
780 struct dwarf2_section_info loc;
781 struct dwarf2_section_info macinfo;
782 struct dwarf2_section_info macro;
783 struct dwarf2_section_info str_offsets;
784 /* Each DWP hash table entry records one CU or one TU.
785 That is recorded here, and copied to dwo_unit.section. */
786 struct dwarf2_section_info info_or_types;
789 /* Similar to virtual_v1_dwo_sections, but for DWP version 2.
790 In version 2, the sections of the DWO files are concatenated together
791 and stored in one section of that name. Thus each ELF section contains
792 several "virtual" sections. */
794 struct virtual_v2_dwo_sections
796 bfd_size_type abbrev_offset;
797 bfd_size_type abbrev_size;
799 bfd_size_type line_offset;
800 bfd_size_type line_size;
802 bfd_size_type loc_offset;
803 bfd_size_type loc_size;
805 bfd_size_type macinfo_offset;
806 bfd_size_type macinfo_size;
808 bfd_size_type macro_offset;
809 bfd_size_type macro_size;
811 bfd_size_type str_offsets_offset;
812 bfd_size_type str_offsets_size;
814 /* Each DWP hash table entry records one CU or one TU.
815 That is recorded here, and copied to dwo_unit.section. */
816 bfd_size_type info_or_types_offset;
817 bfd_size_type info_or_types_size;
820 /* Contents of DWP hash tables. */
822 struct dwp_hash_table
824 uint32_t version, nr_columns;
825 uint32_t nr_units, nr_slots;
826 const gdb_byte *hash_table, *unit_table;
831 const gdb_byte *indices;
835 /* This is indexed by column number and gives the id of the section
837 #define MAX_NR_V2_DWO_SECTIONS \
838 (1 /* .debug_info or .debug_types */ \
839 + 1 /* .debug_abbrev */ \
840 + 1 /* .debug_line */ \
841 + 1 /* .debug_loc */ \
842 + 1 /* .debug_str_offsets */ \
843 + 1 /* .debug_macro or .debug_macinfo */)
844 int section_ids[MAX_NR_V2_DWO_SECTIONS];
845 const gdb_byte *offsets;
846 const gdb_byte *sizes;
851 /* Data for one DWP file. */
855 dwp_file (const char *name_, gdb_bfd_ref_ptr &&abfd)
857 dbfd (std::move (abfd))
861 /* Name of the file. */
864 /* File format version. */
868 gdb_bfd_ref_ptr dbfd;
870 /* Section info for this file. */
871 struct dwp_sections sections {};
873 /* Table of CUs in the file. */
874 const struct dwp_hash_table *cus = nullptr;
876 /* Table of TUs in the file. */
877 const struct dwp_hash_table *tus = nullptr;
879 /* Tables of loaded CUs/TUs. Each entry is a struct dwo_unit *. */
880 htab_t loaded_cus {};
881 htab_t loaded_tus {};
883 /* Table to map ELF section numbers to their sections.
884 This is only needed for the DWP V1 file format. */
885 unsigned int num_sections = 0;
886 asection **elf_sections = nullptr;
889 /* This represents a '.dwz' file. */
893 dwz_file (gdb_bfd_ref_ptr &&bfd)
894 : dwz_bfd (std::move (bfd))
898 /* A dwz file can only contain a few sections. */
899 struct dwarf2_section_info abbrev {};
900 struct dwarf2_section_info info {};
901 struct dwarf2_section_info str {};
902 struct dwarf2_section_info line {};
903 struct dwarf2_section_info macro {};
904 struct dwarf2_section_info gdb_index {};
905 struct dwarf2_section_info debug_names {};
908 gdb_bfd_ref_ptr dwz_bfd;
910 /* If we loaded the index from an external file, this contains the
911 resources associated to the open file, memory mapping, etc. */
912 std::unique_ptr<index_cache_resource> index_cache_res;
915 /* Struct used to pass misc. parameters to read_die_and_children, et
916 al. which are used for both .debug_info and .debug_types dies.
917 All parameters here are unchanging for the life of the call. This
918 struct exists to abstract away the constant parameters of die reading. */
920 struct die_reader_specs
922 /* The bfd of die_section. */
925 /* The CU of the DIE we are parsing. */
926 struct dwarf2_cu *cu;
928 /* Non-NULL if reading a DWO file (including one packaged into a DWP). */
929 struct dwo_file *dwo_file;
931 /* The section the die comes from.
932 This is either .debug_info or .debug_types, or the .dwo variants. */
933 struct dwarf2_section_info *die_section;
935 /* die_section->buffer. */
936 const gdb_byte *buffer;
938 /* The end of the buffer. */
939 const gdb_byte *buffer_end;
941 /* The value of the DW_AT_comp_dir attribute. */
942 const char *comp_dir;
944 /* The abbreviation table to use when reading the DIEs. */
945 struct abbrev_table *abbrev_table;
948 /* Type of function passed to init_cutu_and_read_dies, et.al. */
949 typedef void (die_reader_func_ftype) (const struct die_reader_specs *reader,
950 const gdb_byte *info_ptr,
951 struct die_info *comp_unit_die,
955 /* A 1-based directory index. This is a strong typedef to prevent
956 accidentally using a directory index as a 0-based index into an
958 enum class dir_index : unsigned int {};
960 /* Likewise, a 1-based file name index. */
961 enum class file_name_index : unsigned int {};
965 file_entry () = default;
967 file_entry (const char *name_, dir_index d_index_,
968 unsigned int mod_time_, unsigned int length_)
971 mod_time (mod_time_),
975 /* Return the include directory at D_INDEX stored in LH. Returns
976 NULL if D_INDEX is out of bounds. */
977 const char *include_dir (const line_header *lh) const;
979 /* The file name. Note this is an observing pointer. The memory is
980 owned by debug_line_buffer. */
983 /* The directory index (1-based). */
984 dir_index d_index {};
986 unsigned int mod_time {};
988 unsigned int length {};
990 /* True if referenced by the Line Number Program. */
993 /* The associated symbol table, if any. */
994 struct symtab *symtab {};
997 /* The line number information for a compilation unit (found in the
998 .debug_line section) begins with a "statement program header",
999 which contains the following information. */
1006 /* Add an entry to the include directory table. */
1007 void add_include_dir (const char *include_dir);
1009 /* Add an entry to the file name table. */
1010 void add_file_name (const char *name, dir_index d_index,
1011 unsigned int mod_time, unsigned int length);
1013 /* Return the include dir at INDEX (1-based). Returns NULL if INDEX
1014 is out of bounds. */
1015 const char *include_dir_at (dir_index index) const
1017 /* Convert directory index number (1-based) to vector index
1019 size_t vec_index = to_underlying (index) - 1;
1021 if (vec_index >= include_dirs.size ())
1023 return include_dirs[vec_index];
1026 /* Return the file name at INDEX (1-based). Returns NULL if INDEX
1027 is out of bounds. */
1028 file_entry *file_name_at (file_name_index index)
1030 /* Convert file name index number (1-based) to vector index
1032 size_t vec_index = to_underlying (index) - 1;
1034 if (vec_index >= file_names.size ())
1036 return &file_names[vec_index];
1039 /* Offset of line number information in .debug_line section. */
1040 sect_offset sect_off {};
1042 /* OFFSET is for struct dwz_file associated with dwarf2_per_objfile. */
1043 unsigned offset_in_dwz : 1; /* Can't initialize bitfields in-class. */
1045 unsigned int total_length {};
1046 unsigned short version {};
1047 unsigned int header_length {};
1048 unsigned char minimum_instruction_length {};
1049 unsigned char maximum_ops_per_instruction {};
1050 unsigned char default_is_stmt {};
1052 unsigned char line_range {};
1053 unsigned char opcode_base {};
1055 /* standard_opcode_lengths[i] is the number of operands for the
1056 standard opcode whose value is i. This means that
1057 standard_opcode_lengths[0] is unused, and the last meaningful
1058 element is standard_opcode_lengths[opcode_base - 1]. */
1059 std::unique_ptr<unsigned char[]> standard_opcode_lengths;
1061 /* The include_directories table. Note these are observing
1062 pointers. The memory is owned by debug_line_buffer. */
1063 std::vector<const char *> include_dirs;
1065 /* The file_names table. */
1066 std::vector<file_entry> file_names;
1068 /* The start and end of the statement program following this
1069 header. These point into dwarf2_per_objfile->line_buffer. */
1070 const gdb_byte *statement_program_start {}, *statement_program_end {};
1073 typedef std::unique_ptr<line_header> line_header_up;
1076 file_entry::include_dir (const line_header *lh) const
1078 return lh->include_dir_at (d_index);
1081 /* When we construct a partial symbol table entry we only
1082 need this much information. */
1083 struct partial_die_info : public allocate_on_obstack
1085 partial_die_info (sect_offset sect_off, struct abbrev_info *abbrev);
1087 /* Disable assign but still keep copy ctor, which is needed
1088 load_partial_dies. */
1089 partial_die_info& operator=(const partial_die_info& rhs) = delete;
1091 /* Adjust the partial die before generating a symbol for it. This
1092 function may set the is_external flag or change the DIE's
1094 void fixup (struct dwarf2_cu *cu);
1096 /* Read a minimal amount of information into the minimal die
1098 const gdb_byte *read (const struct die_reader_specs *reader,
1099 const struct abbrev_info &abbrev,
1100 const gdb_byte *info_ptr);
1102 /* Offset of this DIE. */
1103 const sect_offset sect_off;
1105 /* DWARF-2 tag for this DIE. */
1106 const ENUM_BITFIELD(dwarf_tag) tag : 16;
1108 /* Assorted flags describing the data found in this DIE. */
1109 const unsigned int has_children : 1;
1111 unsigned int is_external : 1;
1112 unsigned int is_declaration : 1;
1113 unsigned int has_type : 1;
1114 unsigned int has_specification : 1;
1115 unsigned int has_pc_info : 1;
1116 unsigned int may_be_inlined : 1;
1118 /* This DIE has been marked DW_AT_main_subprogram. */
1119 unsigned int main_subprogram : 1;
1121 /* Flag set if the SCOPE field of this structure has been
1123 unsigned int scope_set : 1;
1125 /* Flag set if the DIE has a byte_size attribute. */
1126 unsigned int has_byte_size : 1;
1128 /* Flag set if the DIE has a DW_AT_const_value attribute. */
1129 unsigned int has_const_value : 1;
1131 /* Flag set if any of the DIE's children are template arguments. */
1132 unsigned int has_template_arguments : 1;
1134 /* Flag set if fixup has been called on this die. */
1135 unsigned int fixup_called : 1;
1137 /* Flag set if DW_TAG_imported_unit uses DW_FORM_GNU_ref_alt. */
1138 unsigned int is_dwz : 1;
1140 /* Flag set if spec_offset uses DW_FORM_GNU_ref_alt. */
1141 unsigned int spec_is_dwz : 1;
1143 /* The name of this DIE. Normally the value of DW_AT_name, but
1144 sometimes a default name for unnamed DIEs. */
1145 const char *name = nullptr;
1147 /* The linkage name, if present. */
1148 const char *linkage_name = nullptr;
1150 /* The scope to prepend to our children. This is generally
1151 allocated on the comp_unit_obstack, so will disappear
1152 when this compilation unit leaves the cache. */
1153 const char *scope = nullptr;
1155 /* Some data associated with the partial DIE. The tag determines
1156 which field is live. */
1159 /* The location description associated with this DIE, if any. */
1160 struct dwarf_block *locdesc;
1161 /* The offset of an import, for DW_TAG_imported_unit. */
1162 sect_offset sect_off;
1165 /* If HAS_PC_INFO, the PC range associated with this DIE. */
1166 CORE_ADDR lowpc = 0;
1167 CORE_ADDR highpc = 0;
1169 /* Pointer into the info_buffer (or types_buffer) pointing at the target of
1170 DW_AT_sibling, if any. */
1171 /* NOTE: This member isn't strictly necessary, partial_die_info::read
1172 could return DW_AT_sibling values to its caller load_partial_dies. */
1173 const gdb_byte *sibling = nullptr;
1175 /* If HAS_SPECIFICATION, the offset of the DIE referred to by
1176 DW_AT_specification (or DW_AT_abstract_origin or
1177 DW_AT_extension). */
1178 sect_offset spec_offset {};
1180 /* Pointers to this DIE's parent, first child, and next sibling,
1182 struct partial_die_info *die_parent = nullptr;
1183 struct partial_die_info *die_child = nullptr;
1184 struct partial_die_info *die_sibling = nullptr;
1186 friend struct partial_die_info *
1187 dwarf2_cu::find_partial_die (sect_offset sect_off);
1190 /* Only need to do look up in dwarf2_cu::find_partial_die. */
1191 partial_die_info (sect_offset sect_off)
1192 : partial_die_info (sect_off, DW_TAG_padding, 0)
1196 partial_die_info (sect_offset sect_off_, enum dwarf_tag tag_,
1198 : sect_off (sect_off_), tag (tag_), has_children (has_children_)
1203 has_specification = 0;
1206 main_subprogram = 0;
1209 has_const_value = 0;
1210 has_template_arguments = 0;
1217 /* This data structure holds the information of an abbrev. */
1220 unsigned int number; /* number identifying abbrev */
1221 enum dwarf_tag tag; /* dwarf tag */
1222 unsigned short has_children; /* boolean */
1223 unsigned short num_attrs; /* number of attributes */
1224 struct attr_abbrev *attrs; /* an array of attribute descriptions */
1225 struct abbrev_info *next; /* next in chain */
1230 ENUM_BITFIELD(dwarf_attribute) name : 16;
1231 ENUM_BITFIELD(dwarf_form) form : 16;
1233 /* It is valid only if FORM is DW_FORM_implicit_const. */
1234 LONGEST implicit_const;
1237 /* Size of abbrev_table.abbrev_hash_table. */
1238 #define ABBREV_HASH_SIZE 121
1240 /* Top level data structure to contain an abbreviation table. */
1244 explicit abbrev_table (sect_offset off)
1248 XOBNEWVEC (&abbrev_obstack, struct abbrev_info *, ABBREV_HASH_SIZE);
1249 memset (m_abbrevs, 0, ABBREV_HASH_SIZE * sizeof (struct abbrev_info *));
1252 DISABLE_COPY_AND_ASSIGN (abbrev_table);
1254 /* Allocate space for a struct abbrev_info object in
1256 struct abbrev_info *alloc_abbrev ();
1258 /* Add an abbreviation to the table. */
1259 void add_abbrev (unsigned int abbrev_number, struct abbrev_info *abbrev);
1261 /* Look up an abbrev in the table.
1262 Returns NULL if the abbrev is not found. */
1264 struct abbrev_info *lookup_abbrev (unsigned int abbrev_number);
1267 /* Where the abbrev table came from.
1268 This is used as a sanity check when the table is used. */
1269 const sect_offset sect_off;
1271 /* Storage for the abbrev table. */
1272 auto_obstack abbrev_obstack;
1276 /* Hash table of abbrevs.
1277 This is an array of size ABBREV_HASH_SIZE allocated in abbrev_obstack.
1278 It could be statically allocated, but the previous code didn't so we
1280 struct abbrev_info **m_abbrevs;
1283 typedef std::unique_ptr<struct abbrev_table> abbrev_table_up;
1285 /* Attributes have a name and a value. */
1288 ENUM_BITFIELD(dwarf_attribute) name : 16;
1289 ENUM_BITFIELD(dwarf_form) form : 15;
1291 /* Has DW_STRING already been updated by dwarf2_canonicalize_name? This
1292 field should be in u.str (existing only for DW_STRING) but it is kept
1293 here for better struct attribute alignment. */
1294 unsigned int string_is_canonical : 1;
1299 struct dwarf_block *blk;
1308 /* This data structure holds a complete die structure. */
1311 /* DWARF-2 tag for this DIE. */
1312 ENUM_BITFIELD(dwarf_tag) tag : 16;
1314 /* Number of attributes */
1315 unsigned char num_attrs;
1317 /* True if we're presently building the full type name for the
1318 type derived from this DIE. */
1319 unsigned char building_fullname : 1;
1321 /* True if this die is in process. PR 16581. */
1322 unsigned char in_process : 1;
1325 unsigned int abbrev;
1327 /* Offset in .debug_info or .debug_types section. */
1328 sect_offset sect_off;
1330 /* The dies in a compilation unit form an n-ary tree. PARENT
1331 points to this die's parent; CHILD points to the first child of
1332 this node; and all the children of a given node are chained
1333 together via their SIBLING fields. */
1334 struct die_info *child; /* Its first child, if any. */
1335 struct die_info *sibling; /* Its next sibling, if any. */
1336 struct die_info *parent; /* Its parent, if any. */
1338 /* An array of attributes, with NUM_ATTRS elements. There may be
1339 zero, but it's not common and zero-sized arrays are not
1340 sufficiently portable C. */
1341 struct attribute attrs[1];
1344 /* Get at parts of an attribute structure. */
1346 #define DW_STRING(attr) ((attr)->u.str)
1347 #define DW_STRING_IS_CANONICAL(attr) ((attr)->string_is_canonical)
1348 #define DW_UNSND(attr) ((attr)->u.unsnd)
1349 #define DW_BLOCK(attr) ((attr)->u.blk)
1350 #define DW_SND(attr) ((attr)->u.snd)
1351 #define DW_ADDR(attr) ((attr)->u.addr)
1352 #define DW_SIGNATURE(attr) ((attr)->u.signature)
1354 /* Blocks are a bunch of untyped bytes. */
1359 /* Valid only if SIZE is not zero. */
1360 const gdb_byte *data;
1363 #ifndef ATTR_ALLOC_CHUNK
1364 #define ATTR_ALLOC_CHUNK 4
1367 /* Allocate fields for structs, unions and enums in this size. */
1368 #ifndef DW_FIELD_ALLOC_CHUNK
1369 #define DW_FIELD_ALLOC_CHUNK 4
1372 /* FIXME: We might want to set this from BFD via bfd_arch_bits_per_byte,
1373 but this would require a corresponding change in unpack_field_as_long
1375 static int bits_per_byte = 8;
1377 /* When reading a variant or variant part, we track a bit more
1378 information about the field, and store it in an object of this
1381 struct variant_field
1383 /* If we see a DW_TAG_variant, then this will be the discriminant
1385 ULONGEST discriminant_value;
1386 /* If we see a DW_TAG_variant, then this will be set if this is the
1388 bool default_branch;
1389 /* While reading a DW_TAG_variant_part, this will be set if this
1390 field is the discriminant. */
1391 bool is_discriminant;
1396 int accessibility = 0;
1398 /* Extra information to describe a variant or variant part. */
1399 struct variant_field variant {};
1400 struct field field {};
1405 const char *name = nullptr;
1406 std::vector<struct fn_field> fnfields;
1409 /* The routines that read and process dies for a C struct or C++ class
1410 pass lists of data member fields and lists of member function fields
1411 in an instance of a field_info structure, as defined below. */
1414 /* List of data member and baseclasses fields. */
1415 std::vector<struct nextfield> fields;
1416 std::vector<struct nextfield> baseclasses;
1418 /* Number of fields (including baseclasses). */
1421 /* Set if the accesibility of one of the fields is not public. */
1422 int non_public_fields = 0;
1424 /* Member function fieldlist array, contains name of possibly overloaded
1425 member function, number of overloaded member functions and a pointer
1426 to the head of the member function field chain. */
1427 std::vector<struct fnfieldlist> fnfieldlists;
1429 /* typedefs defined inside this class. TYPEDEF_FIELD_LIST contains head of
1430 a NULL terminated list of TYPEDEF_FIELD_LIST_COUNT elements. */
1431 std::vector<struct decl_field> typedef_field_list;
1433 /* Nested types defined by this class and the number of elements in this
1435 std::vector<struct decl_field> nested_types_list;
1438 /* One item on the queue of compilation units to read in full symbols
1440 struct dwarf2_queue_item
1442 struct dwarf2_per_cu_data *per_cu;
1443 enum language pretend_language;
1444 struct dwarf2_queue_item *next;
1447 /* The current queue. */
1448 static struct dwarf2_queue_item *dwarf2_queue, *dwarf2_queue_tail;
1450 /* Loaded secondary compilation units are kept in memory until they
1451 have not been referenced for the processing of this many
1452 compilation units. Set this to zero to disable caching. Cache
1453 sizes of up to at least twenty will improve startup time for
1454 typical inter-CU-reference binaries, at an obvious memory cost. */
1455 static int dwarf_max_cache_age = 5;
1457 show_dwarf_max_cache_age (struct ui_file *file, int from_tty,
1458 struct cmd_list_element *c, const char *value)
1460 fprintf_filtered (file, _("The upper bound on the age of cached "
1461 "DWARF compilation units is %s.\n"),
1465 /* local function prototypes */
1467 static const char *get_section_name (const struct dwarf2_section_info *);
1469 static const char *get_section_file_name (const struct dwarf2_section_info *);
1471 static void dwarf2_find_base_address (struct die_info *die,
1472 struct dwarf2_cu *cu);
1474 static struct partial_symtab *create_partial_symtab
1475 (struct dwarf2_per_cu_data *per_cu, const char *name);
1477 static void build_type_psymtabs_reader (const struct die_reader_specs *reader,
1478 const gdb_byte *info_ptr,
1479 struct die_info *type_unit_die,
1480 int has_children, void *data);
1482 static void dwarf2_build_psymtabs_hard
1483 (struct dwarf2_per_objfile *dwarf2_per_objfile);
1485 static void scan_partial_symbols (struct partial_die_info *,
1486 CORE_ADDR *, CORE_ADDR *,
1487 int, struct dwarf2_cu *);
1489 static void add_partial_symbol (struct partial_die_info *,
1490 struct dwarf2_cu *);
1492 static void add_partial_namespace (struct partial_die_info *pdi,
1493 CORE_ADDR *lowpc, CORE_ADDR *highpc,
1494 int set_addrmap, struct dwarf2_cu *cu);
1496 static void add_partial_module (struct partial_die_info *pdi, CORE_ADDR *lowpc,
1497 CORE_ADDR *highpc, int set_addrmap,
1498 struct dwarf2_cu *cu);
1500 static void add_partial_enumeration (struct partial_die_info *enum_pdi,
1501 struct dwarf2_cu *cu);
1503 static void add_partial_subprogram (struct partial_die_info *pdi,
1504 CORE_ADDR *lowpc, CORE_ADDR *highpc,
1505 int need_pc, struct dwarf2_cu *cu);
1507 static void dwarf2_read_symtab (struct partial_symtab *,
1510 static void psymtab_to_symtab_1 (struct partial_symtab *);
1512 static abbrev_table_up abbrev_table_read_table
1513 (struct dwarf2_per_objfile *dwarf2_per_objfile, struct dwarf2_section_info *,
1516 static unsigned int peek_abbrev_code (bfd *, const gdb_byte *);
1518 static struct partial_die_info *load_partial_dies
1519 (const struct die_reader_specs *, const gdb_byte *, int);
1521 static struct partial_die_info *find_partial_die (sect_offset, int,
1522 struct dwarf2_cu *);
1524 static const gdb_byte *read_attribute (const struct die_reader_specs *,
1525 struct attribute *, struct attr_abbrev *,
1528 static unsigned int read_1_byte (bfd *, const gdb_byte *);
1530 static int read_1_signed_byte (bfd *, const gdb_byte *);
1532 static unsigned int read_2_bytes (bfd *, const gdb_byte *);
1534 static unsigned int read_4_bytes (bfd *, const gdb_byte *);
1536 static ULONGEST read_8_bytes (bfd *, const gdb_byte *);
1538 static CORE_ADDR read_address (bfd *, const gdb_byte *ptr, struct dwarf2_cu *,
1541 static LONGEST read_initial_length (bfd *, const gdb_byte *, unsigned int *);
1543 static LONGEST read_checked_initial_length_and_offset
1544 (bfd *, const gdb_byte *, const struct comp_unit_head *,
1545 unsigned int *, unsigned int *);
1547 static LONGEST read_offset (bfd *, const gdb_byte *,
1548 const struct comp_unit_head *,
1551 static LONGEST read_offset_1 (bfd *, const gdb_byte *, unsigned int);
1553 static sect_offset read_abbrev_offset
1554 (struct dwarf2_per_objfile *dwarf2_per_objfile,
1555 struct dwarf2_section_info *, sect_offset);
1557 static const gdb_byte *read_n_bytes (bfd *, const gdb_byte *, unsigned int);
1559 static const char *read_direct_string (bfd *, const gdb_byte *, unsigned int *);
1561 static const char *read_indirect_string
1562 (struct dwarf2_per_objfile *dwarf2_per_objfile, bfd *, const gdb_byte *,
1563 const struct comp_unit_head *, unsigned int *);
1565 static const char *read_indirect_line_string
1566 (struct dwarf2_per_objfile *dwarf2_per_objfile, bfd *, const gdb_byte *,
1567 const struct comp_unit_head *, unsigned int *);
1569 static const char *read_indirect_string_at_offset
1570 (struct dwarf2_per_objfile *dwarf2_per_objfile, bfd *abfd,
1571 LONGEST str_offset);
1573 static const char *read_indirect_string_from_dwz
1574 (struct objfile *objfile, struct dwz_file *, LONGEST);
1576 static LONGEST read_signed_leb128 (bfd *, const gdb_byte *, unsigned int *);
1578 static CORE_ADDR read_addr_index_from_leb128 (struct dwarf2_cu *,
1582 static const char *read_str_index (const struct die_reader_specs *reader,
1583 ULONGEST str_index);
1585 static void set_cu_language (unsigned int, struct dwarf2_cu *);
1587 static struct attribute *dwarf2_attr (struct die_info *, unsigned int,
1588 struct dwarf2_cu *);
1590 static struct attribute *dwarf2_attr_no_follow (struct die_info *,
1593 static const char *dwarf2_string_attr (struct die_info *die, unsigned int name,
1594 struct dwarf2_cu *cu);
1596 static int dwarf2_flag_true_p (struct die_info *die, unsigned name,
1597 struct dwarf2_cu *cu);
1599 static int die_is_declaration (struct die_info *, struct dwarf2_cu *cu);
1601 static struct die_info *die_specification (struct die_info *die,
1602 struct dwarf2_cu **);
1604 static line_header_up dwarf_decode_line_header (sect_offset sect_off,
1605 struct dwarf2_cu *cu);
1607 static void dwarf_decode_lines (struct line_header *, const char *,
1608 struct dwarf2_cu *, struct partial_symtab *,
1609 CORE_ADDR, int decode_mapping);
1611 static void dwarf2_start_subfile (struct dwarf2_cu *, const char *,
1614 static struct symbol *new_symbol (struct die_info *, struct type *,
1615 struct dwarf2_cu *, struct symbol * = NULL);
1617 static void dwarf2_const_value (const struct attribute *, struct symbol *,
1618 struct dwarf2_cu *);
1620 static void dwarf2_const_value_attr (const struct attribute *attr,
1623 struct obstack *obstack,
1624 struct dwarf2_cu *cu, LONGEST *value,
1625 const gdb_byte **bytes,
1626 struct dwarf2_locexpr_baton **baton);
1628 static struct type *die_type (struct die_info *, struct dwarf2_cu *);
1630 static int need_gnat_info (struct dwarf2_cu *);
1632 static struct type *die_descriptive_type (struct die_info *,
1633 struct dwarf2_cu *);
1635 static void set_descriptive_type (struct type *, struct die_info *,
1636 struct dwarf2_cu *);
1638 static struct type *die_containing_type (struct die_info *,
1639 struct dwarf2_cu *);
1641 static struct type *lookup_die_type (struct die_info *, const struct attribute *,
1642 struct dwarf2_cu *);
1644 static struct type *read_type_die (struct die_info *, struct dwarf2_cu *);
1646 static struct type *read_type_die_1 (struct die_info *, struct dwarf2_cu *);
1648 static const char *determine_prefix (struct die_info *die, struct dwarf2_cu *);
1650 static char *typename_concat (struct obstack *obs, const char *prefix,
1651 const char *suffix, int physname,
1652 struct dwarf2_cu *cu);
1654 static void read_file_scope (struct die_info *, struct dwarf2_cu *);
1656 static void read_type_unit_scope (struct die_info *, struct dwarf2_cu *);
1658 static void read_func_scope (struct die_info *, struct dwarf2_cu *);
1660 static void read_lexical_block_scope (struct die_info *, struct dwarf2_cu *);
1662 static void read_call_site_scope (struct die_info *die, struct dwarf2_cu *cu);
1664 static void read_variable (struct die_info *die, struct dwarf2_cu *cu);
1666 static int dwarf2_ranges_read (unsigned, CORE_ADDR *, CORE_ADDR *,
1667 struct dwarf2_cu *, struct partial_symtab *);
1669 /* How dwarf2_get_pc_bounds constructed its *LOWPC and *HIGHPC return
1670 values. Keep the items ordered with increasing constraints compliance. */
1673 /* No attribute DW_AT_low_pc, DW_AT_high_pc or DW_AT_ranges was found. */
1674 PC_BOUNDS_NOT_PRESENT,
1676 /* Some of the attributes DW_AT_low_pc, DW_AT_high_pc or DW_AT_ranges
1677 were present but they do not form a valid range of PC addresses. */
1680 /* Discontiguous range was found - that is DW_AT_ranges was found. */
1683 /* Contiguous range was found - DW_AT_low_pc and DW_AT_high_pc were found. */
1687 static enum pc_bounds_kind dwarf2_get_pc_bounds (struct die_info *,
1688 CORE_ADDR *, CORE_ADDR *,
1690 struct partial_symtab *);
1692 static void get_scope_pc_bounds (struct die_info *,
1693 CORE_ADDR *, CORE_ADDR *,
1694 struct dwarf2_cu *);
1696 static void dwarf2_record_block_ranges (struct die_info *, struct block *,
1697 CORE_ADDR, struct dwarf2_cu *);
1699 static void dwarf2_add_field (struct field_info *, struct die_info *,
1700 struct dwarf2_cu *);
1702 static void dwarf2_attach_fields_to_type (struct field_info *,
1703 struct type *, struct dwarf2_cu *);
1705 static void dwarf2_add_member_fn (struct field_info *,
1706 struct die_info *, struct type *,
1707 struct dwarf2_cu *);
1709 static void dwarf2_attach_fn_fields_to_type (struct field_info *,
1711 struct dwarf2_cu *);
1713 static void process_structure_scope (struct die_info *, struct dwarf2_cu *);
1715 static void read_common_block (struct die_info *, struct dwarf2_cu *);
1717 static void read_namespace (struct die_info *die, struct dwarf2_cu *);
1719 static void read_module (struct die_info *die, struct dwarf2_cu *cu);
1721 static struct using_direct **using_directives (struct dwarf2_cu *cu);
1723 static void read_import_statement (struct die_info *die, struct dwarf2_cu *);
1725 static int read_namespace_alias (struct die_info *die, struct dwarf2_cu *cu);
1727 static struct type *read_module_type (struct die_info *die,
1728 struct dwarf2_cu *cu);
1730 static const char *namespace_name (struct die_info *die,
1731 int *is_anonymous, struct dwarf2_cu *);
1733 static void process_enumeration_scope (struct die_info *, struct dwarf2_cu *);
1735 static CORE_ADDR decode_locdesc (struct dwarf_block *, struct dwarf2_cu *);
1737 static enum dwarf_array_dim_ordering read_array_order (struct die_info *,
1738 struct dwarf2_cu *);
1740 static struct die_info *read_die_and_siblings_1
1741 (const struct die_reader_specs *, const gdb_byte *, const gdb_byte **,
1744 static struct die_info *read_die_and_siblings (const struct die_reader_specs *,
1745 const gdb_byte *info_ptr,
1746 const gdb_byte **new_info_ptr,
1747 struct die_info *parent);
1749 static const gdb_byte *read_full_die_1 (const struct die_reader_specs *,
1750 struct die_info **, const gdb_byte *,
1753 static const gdb_byte *read_full_die (const struct die_reader_specs *,
1754 struct die_info **, const gdb_byte *,
1757 static void process_die (struct die_info *, struct dwarf2_cu *);
1759 static const char *dwarf2_canonicalize_name (const char *, struct dwarf2_cu *,
1762 static const char *dwarf2_name (struct die_info *die, struct dwarf2_cu *);
1764 static const char *dwarf2_full_name (const char *name,
1765 struct die_info *die,
1766 struct dwarf2_cu *cu);
1768 static const char *dwarf2_physname (const char *name, struct die_info *die,
1769 struct dwarf2_cu *cu);
1771 static struct die_info *dwarf2_extension (struct die_info *die,
1772 struct dwarf2_cu **);
1774 static const char *dwarf_tag_name (unsigned int);
1776 static const char *dwarf_attr_name (unsigned int);
1778 static const char *dwarf_form_name (unsigned int);
1780 static const char *dwarf_bool_name (unsigned int);
1782 static const char *dwarf_type_encoding_name (unsigned int);
1784 static struct die_info *sibling_die (struct die_info *);
1786 static void dump_die_shallow (struct ui_file *, int indent, struct die_info *);
1788 static void dump_die_for_error (struct die_info *);
1790 static void dump_die_1 (struct ui_file *, int level, int max_level,
1793 /*static*/ void dump_die (struct die_info *, int max_level);
1795 static void store_in_ref_table (struct die_info *,
1796 struct dwarf2_cu *);
1798 static sect_offset dwarf2_get_ref_die_offset (const struct attribute *);
1800 static LONGEST dwarf2_get_attr_constant_value (const struct attribute *, int);
1802 static struct die_info *follow_die_ref_or_sig (struct die_info *,
1803 const struct attribute *,
1804 struct dwarf2_cu **);
1806 static struct die_info *follow_die_ref (struct die_info *,
1807 const struct attribute *,
1808 struct dwarf2_cu **);
1810 static struct die_info *follow_die_sig (struct die_info *,
1811 const struct attribute *,
1812 struct dwarf2_cu **);
1814 static struct type *get_signatured_type (struct die_info *, ULONGEST,
1815 struct dwarf2_cu *);
1817 static struct type *get_DW_AT_signature_type (struct die_info *,
1818 const struct attribute *,
1819 struct dwarf2_cu *);
1821 static void load_full_type_unit (struct dwarf2_per_cu_data *per_cu);
1823 static void read_signatured_type (struct signatured_type *);
1825 static int attr_to_dynamic_prop (const struct attribute *attr,
1826 struct die_info *die, struct dwarf2_cu *cu,
1827 struct dynamic_prop *prop);
1829 /* memory allocation interface */
1831 static struct dwarf_block *dwarf_alloc_block (struct dwarf2_cu *);
1833 static struct die_info *dwarf_alloc_die (struct dwarf2_cu *, int);
1835 static void dwarf_decode_macros (struct dwarf2_cu *, unsigned int, int);
1837 static int attr_form_is_block (const struct attribute *);
1839 static int attr_form_is_section_offset (const struct attribute *);
1841 static int attr_form_is_constant (const struct attribute *);
1843 static int attr_form_is_ref (const struct attribute *);
1845 static void fill_in_loclist_baton (struct dwarf2_cu *cu,
1846 struct dwarf2_loclist_baton *baton,
1847 const struct attribute *attr);
1849 static void dwarf2_symbol_mark_computed (const struct attribute *attr,
1851 struct dwarf2_cu *cu,
1854 static const gdb_byte *skip_one_die (const struct die_reader_specs *reader,
1855 const gdb_byte *info_ptr,
1856 struct abbrev_info *abbrev);
1858 static hashval_t partial_die_hash (const void *item);
1860 static int partial_die_eq (const void *item_lhs, const void *item_rhs);
1862 static struct dwarf2_per_cu_data *dwarf2_find_containing_comp_unit
1863 (sect_offset sect_off, unsigned int offset_in_dwz,
1864 struct dwarf2_per_objfile *dwarf2_per_objfile);
1866 static void prepare_one_comp_unit (struct dwarf2_cu *cu,
1867 struct die_info *comp_unit_die,
1868 enum language pretend_language);
1870 static void age_cached_comp_units (struct dwarf2_per_objfile *dwarf2_per_objfile);
1872 static void free_one_cached_comp_unit (struct dwarf2_per_cu_data *);
1874 static struct type *set_die_type (struct die_info *, struct type *,
1875 struct dwarf2_cu *);
1877 static void create_all_comp_units (struct dwarf2_per_objfile *dwarf2_per_objfile);
1879 static int create_all_type_units (struct dwarf2_per_objfile *dwarf2_per_objfile);
1881 static void load_full_comp_unit (struct dwarf2_per_cu_data *, bool,
1884 static void process_full_comp_unit (struct dwarf2_per_cu_data *,
1887 static void process_full_type_unit (struct dwarf2_per_cu_data *,
1890 static void dwarf2_add_dependence (struct dwarf2_cu *,
1891 struct dwarf2_per_cu_data *);
1893 static void dwarf2_mark (struct dwarf2_cu *);
1895 static void dwarf2_clear_marks (struct dwarf2_per_cu_data *);
1897 static struct type *get_die_type_at_offset (sect_offset,
1898 struct dwarf2_per_cu_data *);
1900 static struct type *get_die_type (struct die_info *die, struct dwarf2_cu *cu);
1902 static void queue_comp_unit (struct dwarf2_per_cu_data *per_cu,
1903 enum language pretend_language);
1905 static void process_queue (struct dwarf2_per_objfile *dwarf2_per_objfile);
1907 /* Class, the destructor of which frees all allocated queue entries. This
1908 will only have work to do if an error was thrown while processing the
1909 dwarf. If no error was thrown then the queue entries should have all
1910 been processed, and freed, as we went along. */
1912 class dwarf2_queue_guard
1915 dwarf2_queue_guard () = default;
1917 /* Free any entries remaining on the queue. There should only be
1918 entries left if we hit an error while processing the dwarf. */
1919 ~dwarf2_queue_guard ()
1921 struct dwarf2_queue_item *item, *last;
1923 item = dwarf2_queue;
1926 /* Anything still marked queued is likely to be in an
1927 inconsistent state, so discard it. */
1928 if (item->per_cu->queued)
1930 if (item->per_cu->cu != NULL)
1931 free_one_cached_comp_unit (item->per_cu);
1932 item->per_cu->queued = 0;
1940 dwarf2_queue = dwarf2_queue_tail = NULL;
1944 /* The return type of find_file_and_directory. Note, the enclosed
1945 string pointers are only valid while this object is valid. */
1947 struct file_and_directory
1949 /* The filename. This is never NULL. */
1952 /* The compilation directory. NULL if not known. If we needed to
1953 compute a new string, this points to COMP_DIR_STORAGE, otherwise,
1954 points directly to the DW_AT_comp_dir string attribute owned by
1955 the obstack that owns the DIE. */
1956 const char *comp_dir;
1958 /* If we needed to build a new string for comp_dir, this is what
1959 owns the storage. */
1960 std::string comp_dir_storage;
1963 static file_and_directory find_file_and_directory (struct die_info *die,
1964 struct dwarf2_cu *cu);
1966 static char *file_full_name (int file, struct line_header *lh,
1967 const char *comp_dir);
1969 /* Expected enum dwarf_unit_type for read_comp_unit_head. */
1970 enum class rcuh_kind { COMPILE, TYPE };
1972 static const gdb_byte *read_and_check_comp_unit_head
1973 (struct dwarf2_per_objfile* dwarf2_per_objfile,
1974 struct comp_unit_head *header,
1975 struct dwarf2_section_info *section,
1976 struct dwarf2_section_info *abbrev_section, const gdb_byte *info_ptr,
1977 rcuh_kind section_kind);
1979 static void init_cutu_and_read_dies
1980 (struct dwarf2_per_cu_data *this_cu, struct abbrev_table *abbrev_table,
1981 int use_existing_cu, int keep, bool skip_partial,
1982 die_reader_func_ftype *die_reader_func, void *data);
1984 static void init_cutu_and_read_dies_simple
1985 (struct dwarf2_per_cu_data *this_cu,
1986 die_reader_func_ftype *die_reader_func, void *data);
1988 static htab_t allocate_signatured_type_table (struct objfile *objfile);
1990 static htab_t allocate_dwo_unit_table (struct objfile *objfile);
1992 static struct dwo_unit *lookup_dwo_unit_in_dwp
1993 (struct dwarf2_per_objfile *dwarf2_per_objfile,
1994 struct dwp_file *dwp_file, const char *comp_dir,
1995 ULONGEST signature, int is_debug_types);
1997 static struct dwp_file *get_dwp_file
1998 (struct dwarf2_per_objfile *dwarf2_per_objfile);
2000 static struct dwo_unit *lookup_dwo_comp_unit
2001 (struct dwarf2_per_cu_data *, const char *, const char *, ULONGEST);
2003 static struct dwo_unit *lookup_dwo_type_unit
2004 (struct signatured_type *, const char *, const char *);
2006 static void queue_and_load_all_dwo_tus (struct dwarf2_per_cu_data *);
2008 static void free_dwo_file (struct dwo_file *);
2010 /* A unique_ptr helper to free a dwo_file. */
2012 struct dwo_file_deleter
2014 void operator() (struct dwo_file *df) const
2020 /* A unique pointer to a dwo_file. */
2022 typedef std::unique_ptr<struct dwo_file, dwo_file_deleter> dwo_file_up;
2024 static void process_cu_includes (struct dwarf2_per_objfile *dwarf2_per_objfile);
2026 static void check_producer (struct dwarf2_cu *cu);
2028 static void free_line_header_voidp (void *arg);
2030 /* Various complaints about symbol reading that don't abort the process. */
2033 dwarf2_statement_list_fits_in_line_number_section_complaint (void)
2035 complaint (_("statement list doesn't fit in .debug_line section"));
2039 dwarf2_debug_line_missing_file_complaint (void)
2041 complaint (_(".debug_line section has line data without a file"));
2045 dwarf2_debug_line_missing_end_sequence_complaint (void)
2047 complaint (_(".debug_line section has line "
2048 "program sequence without an end"));
2052 dwarf2_complex_location_expr_complaint (void)
2054 complaint (_("location expression too complex"));
2058 dwarf2_const_value_length_mismatch_complaint (const char *arg1, int arg2,
2061 complaint (_("const value length mismatch for '%s', got %d, expected %d"),
2066 dwarf2_section_buffer_overflow_complaint (struct dwarf2_section_info *section)
2068 complaint (_("debug info runs off end of %s section"
2070 get_section_name (section),
2071 get_section_file_name (section));
2075 dwarf2_macro_malformed_definition_complaint (const char *arg1)
2077 complaint (_("macro debug info contains a "
2078 "malformed macro definition:\n`%s'"),
2083 dwarf2_invalid_attrib_class_complaint (const char *arg1, const char *arg2)
2085 complaint (_("invalid attribute class or form for '%s' in '%s'"),
2089 /* Hash function for line_header_hash. */
2092 line_header_hash (const struct line_header *ofs)
2094 return to_underlying (ofs->sect_off) ^ ofs->offset_in_dwz;
2097 /* Hash function for htab_create_alloc_ex for line_header_hash. */
2100 line_header_hash_voidp (const void *item)
2102 const struct line_header *ofs = (const struct line_header *) item;
2104 return line_header_hash (ofs);
2107 /* Equality function for line_header_hash. */
2110 line_header_eq_voidp (const void *item_lhs, const void *item_rhs)
2112 const struct line_header *ofs_lhs = (const struct line_header *) item_lhs;
2113 const struct line_header *ofs_rhs = (const struct line_header *) item_rhs;
2115 return (ofs_lhs->sect_off == ofs_rhs->sect_off
2116 && ofs_lhs->offset_in_dwz == ofs_rhs->offset_in_dwz);
2121 /* Read the given attribute value as an address, taking the attribute's
2122 form into account. */
2125 attr_value_as_address (struct attribute *attr)
2129 if (attr->form != DW_FORM_addr && attr->form != DW_FORM_addrx
2130 && attr->form != DW_FORM_GNU_addr_index)
2132 /* Aside from a few clearly defined exceptions, attributes that
2133 contain an address must always be in DW_FORM_addr form.
2134 Unfortunately, some compilers happen to be violating this
2135 requirement by encoding addresses using other forms, such
2136 as DW_FORM_data4 for example. For those broken compilers,
2137 we try to do our best, without any guarantee of success,
2138 to interpret the address correctly. It would also be nice
2139 to generate a complaint, but that would require us to maintain
2140 a list of legitimate cases where a non-address form is allowed,
2141 as well as update callers to pass in at least the CU's DWARF
2142 version. This is more overhead than what we're willing to
2143 expand for a pretty rare case. */
2144 addr = DW_UNSND (attr);
2147 addr = DW_ADDR (attr);
2152 /* See declaration. */
2154 dwarf2_per_objfile::dwarf2_per_objfile (struct objfile *objfile_,
2155 const dwarf2_debug_sections *names)
2156 : objfile (objfile_)
2159 names = &dwarf2_elf_names;
2161 bfd *obfd = objfile->obfd;
2163 for (asection *sec = obfd->sections; sec != NULL; sec = sec->next)
2164 locate_sections (obfd, sec, *names);
2167 static void free_dwo_files (htab_t dwo_files, struct objfile *objfile);
2169 dwarf2_per_objfile::~dwarf2_per_objfile ()
2171 /* Cached DIE trees use xmalloc and the comp_unit_obstack. */
2172 free_cached_comp_units ();
2174 if (quick_file_names_table)
2175 htab_delete (quick_file_names_table);
2177 if (line_header_hash)
2178 htab_delete (line_header_hash);
2180 for (dwarf2_per_cu_data *per_cu : all_comp_units)
2181 VEC_free (dwarf2_per_cu_ptr, per_cu->imported_symtabs);
2183 for (signatured_type *sig_type : all_type_units)
2184 VEC_free (dwarf2_per_cu_ptr, sig_type->per_cu.imported_symtabs);
2186 VEC_free (dwarf2_section_info_def, types);
2188 if (dwo_files != NULL)
2189 free_dwo_files (dwo_files, objfile);
2191 /* Everything else should be on the objfile obstack. */
2194 /* See declaration. */
2197 dwarf2_per_objfile::free_cached_comp_units ()
2199 dwarf2_per_cu_data *per_cu = read_in_chain;
2200 dwarf2_per_cu_data **last_chain = &read_in_chain;
2201 while (per_cu != NULL)
2203 dwarf2_per_cu_data *next_cu = per_cu->cu->read_in_chain;
2206 *last_chain = next_cu;
2211 /* A helper class that calls free_cached_comp_units on
2214 class free_cached_comp_units
2218 explicit free_cached_comp_units (dwarf2_per_objfile *per_objfile)
2219 : m_per_objfile (per_objfile)
2223 ~free_cached_comp_units ()
2225 m_per_objfile->free_cached_comp_units ();
2228 DISABLE_COPY_AND_ASSIGN (free_cached_comp_units);
2232 dwarf2_per_objfile *m_per_objfile;
2235 /* Try to locate the sections we need for DWARF 2 debugging
2236 information and return true if we have enough to do something.
2237 NAMES points to the dwarf2 section names, or is NULL if the standard
2238 ELF names are used. */
2241 dwarf2_has_info (struct objfile *objfile,
2242 const struct dwarf2_debug_sections *names)
2244 if (objfile->flags & OBJF_READNEVER)
2247 struct dwarf2_per_objfile *dwarf2_per_objfile
2248 = get_dwarf2_per_objfile (objfile);
2250 if (dwarf2_per_objfile == NULL)
2252 /* Initialize per-objfile state. */
2254 = new (&objfile->objfile_obstack) struct dwarf2_per_objfile (objfile,
2256 set_dwarf2_per_objfile (objfile, dwarf2_per_objfile);
2258 return (!dwarf2_per_objfile->info.is_virtual
2259 && dwarf2_per_objfile->info.s.section != NULL
2260 && !dwarf2_per_objfile->abbrev.is_virtual
2261 && dwarf2_per_objfile->abbrev.s.section != NULL);
2264 /* Return the containing section of virtual section SECTION. */
2266 static struct dwarf2_section_info *
2267 get_containing_section (const struct dwarf2_section_info *section)
2269 gdb_assert (section->is_virtual);
2270 return section->s.containing_section;
2273 /* Return the bfd owner of SECTION. */
2276 get_section_bfd_owner (const struct dwarf2_section_info *section)
2278 if (section->is_virtual)
2280 section = get_containing_section (section);
2281 gdb_assert (!section->is_virtual);
2283 return section->s.section->owner;
2286 /* Return the bfd section of SECTION.
2287 Returns NULL if the section is not present. */
2290 get_section_bfd_section (const struct dwarf2_section_info *section)
2292 if (section->is_virtual)
2294 section = get_containing_section (section);
2295 gdb_assert (!section->is_virtual);
2297 return section->s.section;
2300 /* Return the name of SECTION. */
2303 get_section_name (const struct dwarf2_section_info *section)
2305 asection *sectp = get_section_bfd_section (section);
2307 gdb_assert (sectp != NULL);
2308 return bfd_section_name (get_section_bfd_owner (section), sectp);
2311 /* Return the name of the file SECTION is in. */
2314 get_section_file_name (const struct dwarf2_section_info *section)
2316 bfd *abfd = get_section_bfd_owner (section);
2318 return bfd_get_filename (abfd);
2321 /* Return the id of SECTION.
2322 Returns 0 if SECTION doesn't exist. */
2325 get_section_id (const struct dwarf2_section_info *section)
2327 asection *sectp = get_section_bfd_section (section);
2334 /* Return the flags of SECTION.
2335 SECTION (or containing section if this is a virtual section) must exist. */
2338 get_section_flags (const struct dwarf2_section_info *section)
2340 asection *sectp = get_section_bfd_section (section);
2342 gdb_assert (sectp != NULL);
2343 return bfd_get_section_flags (sectp->owner, sectp);
2346 /* When loading sections, we look either for uncompressed section or for
2347 compressed section names. */
2350 section_is_p (const char *section_name,
2351 const struct dwarf2_section_names *names)
2353 if (names->normal != NULL
2354 && strcmp (section_name, names->normal) == 0)
2356 if (names->compressed != NULL
2357 && strcmp (section_name, names->compressed) == 0)
2362 /* See declaration. */
2365 dwarf2_per_objfile::locate_sections (bfd *abfd, asection *sectp,
2366 const dwarf2_debug_sections &names)
2368 flagword aflag = bfd_get_section_flags (abfd, sectp);
2370 if ((aflag & SEC_HAS_CONTENTS) == 0)
2373 else if (section_is_p (sectp->name, &names.info))
2375 this->info.s.section = sectp;
2376 this->info.size = bfd_get_section_size (sectp);
2378 else if (section_is_p (sectp->name, &names.abbrev))
2380 this->abbrev.s.section = sectp;
2381 this->abbrev.size = bfd_get_section_size (sectp);
2383 else if (section_is_p (sectp->name, &names.line))
2385 this->line.s.section = sectp;
2386 this->line.size = bfd_get_section_size (sectp);
2388 else if (section_is_p (sectp->name, &names.loc))
2390 this->loc.s.section = sectp;
2391 this->loc.size = bfd_get_section_size (sectp);
2393 else if (section_is_p (sectp->name, &names.loclists))
2395 this->loclists.s.section = sectp;
2396 this->loclists.size = bfd_get_section_size (sectp);
2398 else if (section_is_p (sectp->name, &names.macinfo))
2400 this->macinfo.s.section = sectp;
2401 this->macinfo.size = bfd_get_section_size (sectp);
2403 else if (section_is_p (sectp->name, &names.macro))
2405 this->macro.s.section = sectp;
2406 this->macro.size = bfd_get_section_size (sectp);
2408 else if (section_is_p (sectp->name, &names.str))
2410 this->str.s.section = sectp;
2411 this->str.size = bfd_get_section_size (sectp);
2413 else if (section_is_p (sectp->name, &names.line_str))
2415 this->line_str.s.section = sectp;
2416 this->line_str.size = bfd_get_section_size (sectp);
2418 else if (section_is_p (sectp->name, &names.addr))
2420 this->addr.s.section = sectp;
2421 this->addr.size = bfd_get_section_size (sectp);
2423 else if (section_is_p (sectp->name, &names.frame))
2425 this->frame.s.section = sectp;
2426 this->frame.size = bfd_get_section_size (sectp);
2428 else if (section_is_p (sectp->name, &names.eh_frame))
2430 this->eh_frame.s.section = sectp;
2431 this->eh_frame.size = bfd_get_section_size (sectp);
2433 else if (section_is_p (sectp->name, &names.ranges))
2435 this->ranges.s.section = sectp;
2436 this->ranges.size = bfd_get_section_size (sectp);
2438 else if (section_is_p (sectp->name, &names.rnglists))
2440 this->rnglists.s.section = sectp;
2441 this->rnglists.size = bfd_get_section_size (sectp);
2443 else if (section_is_p (sectp->name, &names.types))
2445 struct dwarf2_section_info type_section;
2447 memset (&type_section, 0, sizeof (type_section));
2448 type_section.s.section = sectp;
2449 type_section.size = bfd_get_section_size (sectp);
2451 VEC_safe_push (dwarf2_section_info_def, this->types,
2454 else if (section_is_p (sectp->name, &names.gdb_index))
2456 this->gdb_index.s.section = sectp;
2457 this->gdb_index.size = bfd_get_section_size (sectp);
2459 else if (section_is_p (sectp->name, &names.debug_names))
2461 this->debug_names.s.section = sectp;
2462 this->debug_names.size = bfd_get_section_size (sectp);
2464 else if (section_is_p (sectp->name, &names.debug_aranges))
2466 this->debug_aranges.s.section = sectp;
2467 this->debug_aranges.size = bfd_get_section_size (sectp);
2470 if ((bfd_get_section_flags (abfd, sectp) & (SEC_LOAD | SEC_ALLOC))
2471 && bfd_section_vma (abfd, sectp) == 0)
2472 this->has_section_at_zero = true;
2475 /* A helper function that decides whether a section is empty,
2479 dwarf2_section_empty_p (const struct dwarf2_section_info *section)
2481 if (section->is_virtual)
2482 return section->size == 0;
2483 return section->s.section == NULL || section->size == 0;
2486 /* See dwarf2read.h. */
2489 dwarf2_read_section (struct objfile *objfile, dwarf2_section_info *info)
2493 gdb_byte *buf, *retbuf;
2497 info->buffer = NULL;
2500 if (dwarf2_section_empty_p (info))
2503 sectp = get_section_bfd_section (info);
2505 /* If this is a virtual section we need to read in the real one first. */
2506 if (info->is_virtual)
2508 struct dwarf2_section_info *containing_section =
2509 get_containing_section (info);
2511 gdb_assert (sectp != NULL);
2512 if ((sectp->flags & SEC_RELOC) != 0)
2514 error (_("Dwarf Error: DWP format V2 with relocations is not"
2515 " supported in section %s [in module %s]"),
2516 get_section_name (info), get_section_file_name (info));
2518 dwarf2_read_section (objfile, containing_section);
2519 /* Other code should have already caught virtual sections that don't
2521 gdb_assert (info->virtual_offset + info->size
2522 <= containing_section->size);
2523 /* If the real section is empty or there was a problem reading the
2524 section we shouldn't get here. */
2525 gdb_assert (containing_section->buffer != NULL);
2526 info->buffer = containing_section->buffer + info->virtual_offset;
2530 /* If the section has relocations, we must read it ourselves.
2531 Otherwise we attach it to the BFD. */
2532 if ((sectp->flags & SEC_RELOC) == 0)
2534 info->buffer = gdb_bfd_map_section (sectp, &info->size);
2538 buf = (gdb_byte *) obstack_alloc (&objfile->objfile_obstack, info->size);
2541 /* When debugging .o files, we may need to apply relocations; see
2542 http://sourceware.org/ml/gdb-patches/2002-04/msg00136.html .
2543 We never compress sections in .o files, so we only need to
2544 try this when the section is not compressed. */
2545 retbuf = symfile_relocate_debug_section (objfile, sectp, buf);
2548 info->buffer = retbuf;
2552 abfd = get_section_bfd_owner (info);
2553 gdb_assert (abfd != NULL);
2555 if (bfd_seek (abfd, sectp->filepos, SEEK_SET) != 0
2556 || bfd_bread (buf, info->size, abfd) != info->size)
2558 error (_("Dwarf Error: Can't read DWARF data"
2559 " in section %s [in module %s]"),
2560 bfd_section_name (abfd, sectp), bfd_get_filename (abfd));
2564 /* A helper function that returns the size of a section in a safe way.
2565 If you are positive that the section has been read before using the
2566 size, then it is safe to refer to the dwarf2_section_info object's
2567 "size" field directly. In other cases, you must call this
2568 function, because for compressed sections the size field is not set
2569 correctly until the section has been read. */
2571 static bfd_size_type
2572 dwarf2_section_size (struct objfile *objfile,
2573 struct dwarf2_section_info *info)
2576 dwarf2_read_section (objfile, info);
2580 /* Fill in SECTP, BUFP and SIZEP with section info, given OBJFILE and
2584 dwarf2_get_section_info (struct objfile *objfile,
2585 enum dwarf2_section_enum sect,
2586 asection **sectp, const gdb_byte **bufp,
2587 bfd_size_type *sizep)
2589 struct dwarf2_per_objfile *data
2590 = (struct dwarf2_per_objfile *) objfile_data (objfile,
2591 dwarf2_objfile_data_key);
2592 struct dwarf2_section_info *info;
2594 /* We may see an objfile without any DWARF, in which case we just
2605 case DWARF2_DEBUG_FRAME:
2606 info = &data->frame;
2608 case DWARF2_EH_FRAME:
2609 info = &data->eh_frame;
2612 gdb_assert_not_reached ("unexpected section");
2615 dwarf2_read_section (objfile, info);
2617 *sectp = get_section_bfd_section (info);
2618 *bufp = info->buffer;
2619 *sizep = info->size;
2622 /* A helper function to find the sections for a .dwz file. */
2625 locate_dwz_sections (bfd *abfd, asection *sectp, void *arg)
2627 struct dwz_file *dwz_file = (struct dwz_file *) arg;
2629 /* Note that we only support the standard ELF names, because .dwz
2630 is ELF-only (at the time of writing). */
2631 if (section_is_p (sectp->name, &dwarf2_elf_names.abbrev))
2633 dwz_file->abbrev.s.section = sectp;
2634 dwz_file->abbrev.size = bfd_get_section_size (sectp);
2636 else if (section_is_p (sectp->name, &dwarf2_elf_names.info))
2638 dwz_file->info.s.section = sectp;
2639 dwz_file->info.size = bfd_get_section_size (sectp);
2641 else if (section_is_p (sectp->name, &dwarf2_elf_names.str))
2643 dwz_file->str.s.section = sectp;
2644 dwz_file->str.size = bfd_get_section_size (sectp);
2646 else if (section_is_p (sectp->name, &dwarf2_elf_names.line))
2648 dwz_file->line.s.section = sectp;
2649 dwz_file->line.size = bfd_get_section_size (sectp);
2651 else if (section_is_p (sectp->name, &dwarf2_elf_names.macro))
2653 dwz_file->macro.s.section = sectp;
2654 dwz_file->macro.size = bfd_get_section_size (sectp);
2656 else if (section_is_p (sectp->name, &dwarf2_elf_names.gdb_index))
2658 dwz_file->gdb_index.s.section = sectp;
2659 dwz_file->gdb_index.size = bfd_get_section_size (sectp);
2661 else if (section_is_p (sectp->name, &dwarf2_elf_names.debug_names))
2663 dwz_file->debug_names.s.section = sectp;
2664 dwz_file->debug_names.size = bfd_get_section_size (sectp);
2668 /* Open the separate '.dwz' debug file, if needed. Return NULL if
2669 there is no .gnu_debugaltlink section in the file. Error if there
2670 is such a section but the file cannot be found. */
2672 static struct dwz_file *
2673 dwarf2_get_dwz_file (struct dwarf2_per_objfile *dwarf2_per_objfile)
2675 const char *filename;
2676 bfd_size_type buildid_len_arg;
2680 if (dwarf2_per_objfile->dwz_file != NULL)
2681 return dwarf2_per_objfile->dwz_file.get ();
2683 bfd_set_error (bfd_error_no_error);
2684 gdb::unique_xmalloc_ptr<char> data
2685 (bfd_get_alt_debug_link_info (dwarf2_per_objfile->objfile->obfd,
2686 &buildid_len_arg, &buildid));
2689 if (bfd_get_error () == bfd_error_no_error)
2691 error (_("could not read '.gnu_debugaltlink' section: %s"),
2692 bfd_errmsg (bfd_get_error ()));
2695 gdb::unique_xmalloc_ptr<bfd_byte> buildid_holder (buildid);
2697 buildid_len = (size_t) buildid_len_arg;
2699 filename = data.get ();
2701 std::string abs_storage;
2702 if (!IS_ABSOLUTE_PATH (filename))
2704 gdb::unique_xmalloc_ptr<char> abs
2705 = gdb_realpath (objfile_name (dwarf2_per_objfile->objfile));
2707 abs_storage = ldirname (abs.get ()) + SLASH_STRING + filename;
2708 filename = abs_storage.c_str ();
2711 /* First try the file name given in the section. If that doesn't
2712 work, try to use the build-id instead. */
2713 gdb_bfd_ref_ptr dwz_bfd (gdb_bfd_open (filename, gnutarget, -1));
2714 if (dwz_bfd != NULL)
2716 if (!build_id_verify (dwz_bfd.get (), buildid_len, buildid))
2717 dwz_bfd.reset (nullptr);
2720 if (dwz_bfd == NULL)
2721 dwz_bfd = build_id_to_debug_bfd (buildid_len, buildid);
2723 if (dwz_bfd == NULL)
2724 error (_("could not find '.gnu_debugaltlink' file for %s"),
2725 objfile_name (dwarf2_per_objfile->objfile));
2727 std::unique_ptr<struct dwz_file> result
2728 (new struct dwz_file (std::move (dwz_bfd)));
2730 bfd_map_over_sections (result->dwz_bfd.get (), locate_dwz_sections,
2733 gdb_bfd_record_inclusion (dwarf2_per_objfile->objfile->obfd,
2734 result->dwz_bfd.get ());
2735 dwarf2_per_objfile->dwz_file = std::move (result);
2736 return dwarf2_per_objfile->dwz_file.get ();
2739 /* DWARF quick_symbols_functions support. */
2741 /* TUs can share .debug_line entries, and there can be a lot more TUs than
2742 unique line tables, so we maintain a separate table of all .debug_line
2743 derived entries to support the sharing.
2744 All the quick functions need is the list of file names. We discard the
2745 line_header when we're done and don't need to record it here. */
2746 struct quick_file_names
2748 /* The data used to construct the hash key. */
2749 struct stmt_list_hash hash;
2751 /* The number of entries in file_names, real_names. */
2752 unsigned int num_file_names;
2754 /* The file names from the line table, after being run through
2756 const char **file_names;
2758 /* The file names from the line table after being run through
2759 gdb_realpath. These are computed lazily. */
2760 const char **real_names;
2763 /* When using the index (and thus not using psymtabs), each CU has an
2764 object of this type. This is used to hold information needed by
2765 the various "quick" methods. */
2766 struct dwarf2_per_cu_quick_data
2768 /* The file table. This can be NULL if there was no file table
2769 or it's currently not read in.
2770 NOTE: This points into dwarf2_per_objfile->quick_file_names_table. */
2771 struct quick_file_names *file_names;
2773 /* The corresponding symbol table. This is NULL if symbols for this
2774 CU have not yet been read. */
2775 struct compunit_symtab *compunit_symtab;
2777 /* A temporary mark bit used when iterating over all CUs in
2778 expand_symtabs_matching. */
2779 unsigned int mark : 1;
2781 /* True if we've tried to read the file table and found there isn't one.
2782 There will be no point in trying to read it again next time. */
2783 unsigned int no_file_data : 1;
2786 /* Utility hash function for a stmt_list_hash. */
2789 hash_stmt_list_entry (const struct stmt_list_hash *stmt_list_hash)
2793 if (stmt_list_hash->dwo_unit != NULL)
2794 v += (uintptr_t) stmt_list_hash->dwo_unit->dwo_file;
2795 v += to_underlying (stmt_list_hash->line_sect_off);
2799 /* Utility equality function for a stmt_list_hash. */
2802 eq_stmt_list_entry (const struct stmt_list_hash *lhs,
2803 const struct stmt_list_hash *rhs)
2805 if ((lhs->dwo_unit != NULL) != (rhs->dwo_unit != NULL))
2807 if (lhs->dwo_unit != NULL
2808 && lhs->dwo_unit->dwo_file != rhs->dwo_unit->dwo_file)
2811 return lhs->line_sect_off == rhs->line_sect_off;
2814 /* Hash function for a quick_file_names. */
2817 hash_file_name_entry (const void *e)
2819 const struct quick_file_names *file_data
2820 = (const struct quick_file_names *) e;
2822 return hash_stmt_list_entry (&file_data->hash);
2825 /* Equality function for a quick_file_names. */
2828 eq_file_name_entry (const void *a, const void *b)
2830 const struct quick_file_names *ea = (const struct quick_file_names *) a;
2831 const struct quick_file_names *eb = (const struct quick_file_names *) b;
2833 return eq_stmt_list_entry (&ea->hash, &eb->hash);
2836 /* Delete function for a quick_file_names. */
2839 delete_file_name_entry (void *e)
2841 struct quick_file_names *file_data = (struct quick_file_names *) e;
2844 for (i = 0; i < file_data->num_file_names; ++i)
2846 xfree ((void*) file_data->file_names[i]);
2847 if (file_data->real_names)
2848 xfree ((void*) file_data->real_names[i]);
2851 /* The space for the struct itself lives on objfile_obstack,
2852 so we don't free it here. */
2855 /* Create a quick_file_names hash table. */
2858 create_quick_file_names_table (unsigned int nr_initial_entries)
2860 return htab_create_alloc (nr_initial_entries,
2861 hash_file_name_entry, eq_file_name_entry,
2862 delete_file_name_entry, xcalloc, xfree);
2865 /* Read in PER_CU->CU. This function is unrelated to symtabs, symtab would
2866 have to be created afterwards. You should call age_cached_comp_units after
2867 processing PER_CU->CU. dw2_setup must have been already called. */
2870 load_cu (struct dwarf2_per_cu_data *per_cu, bool skip_partial)
2872 if (per_cu->is_debug_types)
2873 load_full_type_unit (per_cu);
2875 load_full_comp_unit (per_cu, skip_partial, language_minimal);
2877 if (per_cu->cu == NULL)
2878 return; /* Dummy CU. */
2880 dwarf2_find_base_address (per_cu->cu->dies, per_cu->cu);
2883 /* Read in the symbols for PER_CU. */
2886 dw2_do_instantiate_symtab (struct dwarf2_per_cu_data *per_cu, bool skip_partial)
2888 struct dwarf2_per_objfile *dwarf2_per_objfile = per_cu->dwarf2_per_objfile;
2890 /* Skip type_unit_groups, reading the type units they contain
2891 is handled elsewhere. */
2892 if (IS_TYPE_UNIT_GROUP (per_cu))
2895 /* The destructor of dwarf2_queue_guard frees any entries left on
2896 the queue. After this point we're guaranteed to leave this function
2897 with the dwarf queue empty. */
2898 dwarf2_queue_guard q_guard;
2900 if (dwarf2_per_objfile->using_index
2901 ? per_cu->v.quick->compunit_symtab == NULL
2902 : (per_cu->v.psymtab == NULL || !per_cu->v.psymtab->readin))
2904 queue_comp_unit (per_cu, language_minimal);
2905 load_cu (per_cu, skip_partial);
2907 /* If we just loaded a CU from a DWO, and we're working with an index
2908 that may badly handle TUs, load all the TUs in that DWO as well.
2909 http://sourceware.org/bugzilla/show_bug.cgi?id=15021 */
2910 if (!per_cu->is_debug_types
2911 && per_cu->cu != NULL
2912 && per_cu->cu->dwo_unit != NULL
2913 && dwarf2_per_objfile->index_table != NULL
2914 && dwarf2_per_objfile->index_table->version <= 7
2915 /* DWP files aren't supported yet. */
2916 && get_dwp_file (dwarf2_per_objfile) == NULL)
2917 queue_and_load_all_dwo_tus (per_cu);
2920 process_queue (dwarf2_per_objfile);
2922 /* Age the cache, releasing compilation units that have not
2923 been used recently. */
2924 age_cached_comp_units (dwarf2_per_objfile);
2927 /* Ensure that the symbols for PER_CU have been read in. OBJFILE is
2928 the objfile from which this CU came. Returns the resulting symbol
2931 static struct compunit_symtab *
2932 dw2_instantiate_symtab (struct dwarf2_per_cu_data *per_cu, bool skip_partial)
2934 struct dwarf2_per_objfile *dwarf2_per_objfile = per_cu->dwarf2_per_objfile;
2936 gdb_assert (dwarf2_per_objfile->using_index);
2937 if (!per_cu->v.quick->compunit_symtab)
2939 free_cached_comp_units freer (dwarf2_per_objfile);
2940 scoped_restore decrementer = increment_reading_symtab ();
2941 dw2_do_instantiate_symtab (per_cu, skip_partial);
2942 process_cu_includes (dwarf2_per_objfile);
2945 return per_cu->v.quick->compunit_symtab;
2948 /* See declaration. */
2950 dwarf2_per_cu_data *
2951 dwarf2_per_objfile::get_cutu (int index)
2953 if (index >= this->all_comp_units.size ())
2955 index -= this->all_comp_units.size ();
2956 gdb_assert (index < this->all_type_units.size ());
2957 return &this->all_type_units[index]->per_cu;
2960 return this->all_comp_units[index];
2963 /* See declaration. */
2965 dwarf2_per_cu_data *
2966 dwarf2_per_objfile::get_cu (int index)
2968 gdb_assert (index >= 0 && index < this->all_comp_units.size ());
2970 return this->all_comp_units[index];
2973 /* See declaration. */
2976 dwarf2_per_objfile::get_tu (int index)
2978 gdb_assert (index >= 0 && index < this->all_type_units.size ());
2980 return this->all_type_units[index];
2983 /* Return a new dwarf2_per_cu_data allocated on OBJFILE's
2984 objfile_obstack, and constructed with the specified field
2987 static dwarf2_per_cu_data *
2988 create_cu_from_index_list (struct dwarf2_per_objfile *dwarf2_per_objfile,
2989 struct dwarf2_section_info *section,
2991 sect_offset sect_off, ULONGEST length)
2993 struct objfile *objfile = dwarf2_per_objfile->objfile;
2994 dwarf2_per_cu_data *the_cu
2995 = OBSTACK_ZALLOC (&objfile->objfile_obstack,
2996 struct dwarf2_per_cu_data);
2997 the_cu->sect_off = sect_off;
2998 the_cu->length = length;
2999 the_cu->dwarf2_per_objfile = dwarf2_per_objfile;
3000 the_cu->section = section;
3001 the_cu->v.quick = OBSTACK_ZALLOC (&objfile->objfile_obstack,
3002 struct dwarf2_per_cu_quick_data);
3003 the_cu->is_dwz = is_dwz;
3007 /* A helper for create_cus_from_index that handles a given list of
3011 create_cus_from_index_list (struct dwarf2_per_objfile *dwarf2_per_objfile,
3012 const gdb_byte *cu_list, offset_type n_elements,
3013 struct dwarf2_section_info *section,
3016 for (offset_type i = 0; i < n_elements; i += 2)
3018 gdb_static_assert (sizeof (ULONGEST) >= 8);
3020 sect_offset sect_off
3021 = (sect_offset) extract_unsigned_integer (cu_list, 8, BFD_ENDIAN_LITTLE);
3022 ULONGEST length = extract_unsigned_integer (cu_list + 8, 8, BFD_ENDIAN_LITTLE);
3025 dwarf2_per_cu_data *per_cu
3026 = create_cu_from_index_list (dwarf2_per_objfile, section, is_dwz,
3028 dwarf2_per_objfile->all_comp_units.push_back (per_cu);
3032 /* Read the CU list from the mapped index, and use it to create all
3033 the CU objects for this objfile. */
3036 create_cus_from_index (struct dwarf2_per_objfile *dwarf2_per_objfile,
3037 const gdb_byte *cu_list, offset_type cu_list_elements,
3038 const gdb_byte *dwz_list, offset_type dwz_elements)
3040 gdb_assert (dwarf2_per_objfile->all_comp_units.empty ());
3041 dwarf2_per_objfile->all_comp_units.reserve
3042 ((cu_list_elements + dwz_elements) / 2);
3044 create_cus_from_index_list (dwarf2_per_objfile, cu_list, cu_list_elements,
3045 &dwarf2_per_objfile->info, 0);
3047 if (dwz_elements == 0)
3050 dwz_file *dwz = dwarf2_get_dwz_file (dwarf2_per_objfile);
3051 create_cus_from_index_list (dwarf2_per_objfile, dwz_list, dwz_elements,
3055 /* Create the signatured type hash table from the index. */
3058 create_signatured_type_table_from_index
3059 (struct dwarf2_per_objfile *dwarf2_per_objfile,
3060 struct dwarf2_section_info *section,
3061 const gdb_byte *bytes,
3062 offset_type elements)
3064 struct objfile *objfile = dwarf2_per_objfile->objfile;
3066 gdb_assert (dwarf2_per_objfile->all_type_units.empty ());
3067 dwarf2_per_objfile->all_type_units.reserve (elements / 3);
3069 htab_t sig_types_hash = allocate_signatured_type_table (objfile);
3071 for (offset_type i = 0; i < elements; i += 3)
3073 struct signatured_type *sig_type;
3076 cu_offset type_offset_in_tu;
3078 gdb_static_assert (sizeof (ULONGEST) >= 8);
3079 sect_offset sect_off
3080 = (sect_offset) extract_unsigned_integer (bytes, 8, BFD_ENDIAN_LITTLE);
3082 = (cu_offset) extract_unsigned_integer (bytes + 8, 8,
3084 signature = extract_unsigned_integer (bytes + 16, 8, BFD_ENDIAN_LITTLE);
3087 sig_type = OBSTACK_ZALLOC (&objfile->objfile_obstack,
3088 struct signatured_type);
3089 sig_type->signature = signature;
3090 sig_type->type_offset_in_tu = type_offset_in_tu;
3091 sig_type->per_cu.is_debug_types = 1;
3092 sig_type->per_cu.section = section;
3093 sig_type->per_cu.sect_off = sect_off;
3094 sig_type->per_cu.dwarf2_per_objfile = dwarf2_per_objfile;
3095 sig_type->per_cu.v.quick
3096 = OBSTACK_ZALLOC (&objfile->objfile_obstack,
3097 struct dwarf2_per_cu_quick_data);
3099 slot = htab_find_slot (sig_types_hash, sig_type, INSERT);
3102 dwarf2_per_objfile->all_type_units.push_back (sig_type);
3105 dwarf2_per_objfile->signatured_types = sig_types_hash;
3108 /* Create the signatured type hash table from .debug_names. */
3111 create_signatured_type_table_from_debug_names
3112 (struct dwarf2_per_objfile *dwarf2_per_objfile,
3113 const mapped_debug_names &map,
3114 struct dwarf2_section_info *section,
3115 struct dwarf2_section_info *abbrev_section)
3117 struct objfile *objfile = dwarf2_per_objfile->objfile;
3119 dwarf2_read_section (objfile, section);
3120 dwarf2_read_section (objfile, abbrev_section);
3122 gdb_assert (dwarf2_per_objfile->all_type_units.empty ());
3123 dwarf2_per_objfile->all_type_units.reserve (map.tu_count);
3125 htab_t sig_types_hash = allocate_signatured_type_table (objfile);
3127 for (uint32_t i = 0; i < map.tu_count; ++i)
3129 struct signatured_type *sig_type;
3132 sect_offset sect_off
3133 = (sect_offset) (extract_unsigned_integer
3134 (map.tu_table_reordered + i * map.offset_size,
3136 map.dwarf5_byte_order));
3138 comp_unit_head cu_header;
3139 read_and_check_comp_unit_head (dwarf2_per_objfile, &cu_header, section,
3141 section->buffer + to_underlying (sect_off),
3144 sig_type = OBSTACK_ZALLOC (&objfile->objfile_obstack,
3145 struct signatured_type);
3146 sig_type->signature = cu_header.signature;
3147 sig_type->type_offset_in_tu = cu_header.type_cu_offset_in_tu;
3148 sig_type->per_cu.is_debug_types = 1;
3149 sig_type->per_cu.section = section;
3150 sig_type->per_cu.sect_off = sect_off;
3151 sig_type->per_cu.dwarf2_per_objfile = dwarf2_per_objfile;
3152 sig_type->per_cu.v.quick
3153 = OBSTACK_ZALLOC (&objfile->objfile_obstack,
3154 struct dwarf2_per_cu_quick_data);
3156 slot = htab_find_slot (sig_types_hash, sig_type, INSERT);
3159 dwarf2_per_objfile->all_type_units.push_back (sig_type);
3162 dwarf2_per_objfile->signatured_types = sig_types_hash;
3165 /* Read the address map data from the mapped index, and use it to
3166 populate the objfile's psymtabs_addrmap. */
3169 create_addrmap_from_index (struct dwarf2_per_objfile *dwarf2_per_objfile,
3170 struct mapped_index *index)
3172 struct objfile *objfile = dwarf2_per_objfile->objfile;
3173 struct gdbarch *gdbarch = get_objfile_arch (objfile);
3174 const gdb_byte *iter, *end;
3175 struct addrmap *mutable_map;
3178 auto_obstack temp_obstack;
3180 mutable_map = addrmap_create_mutable (&temp_obstack);
3182 iter = index->address_table.data ();
3183 end = iter + index->address_table.size ();
3185 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
3189 ULONGEST hi, lo, cu_index;
3190 lo = extract_unsigned_integer (iter, 8, BFD_ENDIAN_LITTLE);
3192 hi = extract_unsigned_integer (iter, 8, BFD_ENDIAN_LITTLE);
3194 cu_index = extract_unsigned_integer (iter, 4, BFD_ENDIAN_LITTLE);
3199 complaint (_(".gdb_index address table has invalid range (%s - %s)"),
3200 hex_string (lo), hex_string (hi));
3204 if (cu_index >= dwarf2_per_objfile->all_comp_units.size ())
3206 complaint (_(".gdb_index address table has invalid CU number %u"),
3207 (unsigned) cu_index);
3211 lo = gdbarch_adjust_dwarf2_addr (gdbarch, lo + baseaddr) - baseaddr;
3212 hi = gdbarch_adjust_dwarf2_addr (gdbarch, hi + baseaddr) - baseaddr;
3213 addrmap_set_empty (mutable_map, lo, hi - 1,
3214 dwarf2_per_objfile->get_cu (cu_index));
3217 objfile->partial_symtabs->psymtabs_addrmap
3218 = addrmap_create_fixed (mutable_map, objfile->partial_symtabs->obstack ());
3221 /* Read the address map data from DWARF-5 .debug_aranges, and use it to
3222 populate the objfile's psymtabs_addrmap. */
3225 create_addrmap_from_aranges (struct dwarf2_per_objfile *dwarf2_per_objfile,
3226 struct dwarf2_section_info *section)
3228 struct objfile *objfile = dwarf2_per_objfile->objfile;
3229 bfd *abfd = objfile->obfd;
3230 struct gdbarch *gdbarch = get_objfile_arch (objfile);
3231 const CORE_ADDR baseaddr = ANOFFSET (objfile->section_offsets,
3232 SECT_OFF_TEXT (objfile));
3234 auto_obstack temp_obstack;
3235 addrmap *mutable_map = addrmap_create_mutable (&temp_obstack);
3237 std::unordered_map<sect_offset,
3238 dwarf2_per_cu_data *,
3239 gdb::hash_enum<sect_offset>>
3240 debug_info_offset_to_per_cu;
3241 for (dwarf2_per_cu_data *per_cu : dwarf2_per_objfile->all_comp_units)
3243 const auto insertpair
3244 = debug_info_offset_to_per_cu.emplace (per_cu->sect_off, per_cu);
3245 if (!insertpair.second)
3247 warning (_("Section .debug_aranges in %s has duplicate "
3248 "debug_info_offset %s, ignoring .debug_aranges."),
3249 objfile_name (objfile), sect_offset_str (per_cu->sect_off));
3254 dwarf2_read_section (objfile, section);
3256 const bfd_endian dwarf5_byte_order = gdbarch_byte_order (gdbarch);
3258 const gdb_byte *addr = section->buffer;
3260 while (addr < section->buffer + section->size)
3262 const gdb_byte *const entry_addr = addr;
3263 unsigned int bytes_read;
3265 const LONGEST entry_length = read_initial_length (abfd, addr,
3269 const gdb_byte *const entry_end = addr + entry_length;
3270 const bool dwarf5_is_dwarf64 = bytes_read != 4;
3271 const uint8_t offset_size = dwarf5_is_dwarf64 ? 8 : 4;
3272 if (addr + entry_length > section->buffer + section->size)
3274 warning (_("Section .debug_aranges in %s entry at offset %zu "
3275 "length %s exceeds section length %s, "
3276 "ignoring .debug_aranges."),
3277 objfile_name (objfile), entry_addr - section->buffer,
3278 plongest (bytes_read + entry_length),
3279 pulongest (section->size));
3283 /* The version number. */
3284 const uint16_t version = read_2_bytes (abfd, addr);
3288 warning (_("Section .debug_aranges in %s entry at offset %zu "
3289 "has unsupported version %d, ignoring .debug_aranges."),
3290 objfile_name (objfile), entry_addr - section->buffer,
3295 const uint64_t debug_info_offset
3296 = extract_unsigned_integer (addr, offset_size, dwarf5_byte_order);
3297 addr += offset_size;
3298 const auto per_cu_it
3299 = debug_info_offset_to_per_cu.find (sect_offset (debug_info_offset));
3300 if (per_cu_it == debug_info_offset_to_per_cu.cend ())
3302 warning (_("Section .debug_aranges in %s entry at offset %zu "
3303 "debug_info_offset %s does not exists, "
3304 "ignoring .debug_aranges."),
3305 objfile_name (objfile), entry_addr - section->buffer,
3306 pulongest (debug_info_offset));
3309 dwarf2_per_cu_data *const per_cu = per_cu_it->second;
3311 const uint8_t address_size = *addr++;
3312 if (address_size < 1 || address_size > 8)
3314 warning (_("Section .debug_aranges in %s entry at offset %zu "
3315 "address_size %u is invalid, ignoring .debug_aranges."),
3316 objfile_name (objfile), entry_addr - section->buffer,
3321 const uint8_t segment_selector_size = *addr++;
3322 if (segment_selector_size != 0)
3324 warning (_("Section .debug_aranges in %s entry at offset %zu "
3325 "segment_selector_size %u is not supported, "
3326 "ignoring .debug_aranges."),
3327 objfile_name (objfile), entry_addr - section->buffer,
3328 segment_selector_size);
3332 /* Must pad to an alignment boundary that is twice the address
3333 size. It is undocumented by the DWARF standard but GCC does
3335 for (size_t padding = ((-(addr - section->buffer))
3336 & (2 * address_size - 1));
3337 padding > 0; padding--)
3340 warning (_("Section .debug_aranges in %s entry at offset %zu "
3341 "padding is not zero, ignoring .debug_aranges."),
3342 objfile_name (objfile), entry_addr - section->buffer);
3348 if (addr + 2 * address_size > entry_end)
3350 warning (_("Section .debug_aranges in %s entry at offset %zu "
3351 "address list is not properly terminated, "
3352 "ignoring .debug_aranges."),
3353 objfile_name (objfile), entry_addr - section->buffer);
3356 ULONGEST start = extract_unsigned_integer (addr, address_size,
3358 addr += address_size;
3359 ULONGEST length = extract_unsigned_integer (addr, address_size,
3361 addr += address_size;
3362 if (start == 0 && length == 0)
3364 if (start == 0 && !dwarf2_per_objfile->has_section_at_zero)
3366 /* Symbol was eliminated due to a COMDAT group. */
3369 ULONGEST end = start + length;
3370 start = (gdbarch_adjust_dwarf2_addr (gdbarch, start + baseaddr)
3372 end = (gdbarch_adjust_dwarf2_addr (gdbarch, end + baseaddr)
3374 addrmap_set_empty (mutable_map, start, end - 1, per_cu);
3378 objfile->partial_symtabs->psymtabs_addrmap
3379 = addrmap_create_fixed (mutable_map, objfile->partial_symtabs->obstack ());
3382 /* Find a slot in the mapped index INDEX for the object named NAME.
3383 If NAME is found, set *VEC_OUT to point to the CU vector in the
3384 constant pool and return true. If NAME cannot be found, return
3388 find_slot_in_mapped_hash (struct mapped_index *index, const char *name,
3389 offset_type **vec_out)
3392 offset_type slot, step;
3393 int (*cmp) (const char *, const char *);
3395 gdb::unique_xmalloc_ptr<char> without_params;
3396 if (current_language->la_language == language_cplus
3397 || current_language->la_language == language_fortran
3398 || current_language->la_language == language_d)
3400 /* NAME is already canonical. Drop any qualifiers as .gdb_index does
3403 if (strchr (name, '(') != NULL)
3405 without_params = cp_remove_params (name);
3407 if (without_params != NULL)
3408 name = without_params.get ();
3412 /* Index version 4 did not support case insensitive searches. But the
3413 indices for case insensitive languages are built in lowercase, therefore
3414 simulate our NAME being searched is also lowercased. */
3415 hash = mapped_index_string_hash ((index->version == 4
3416 && case_sensitivity == case_sensitive_off
3417 ? 5 : index->version),
3420 slot = hash & (index->symbol_table.size () - 1);
3421 step = ((hash * 17) & (index->symbol_table.size () - 1)) | 1;
3422 cmp = (case_sensitivity == case_sensitive_on ? strcmp : strcasecmp);
3428 const auto &bucket = index->symbol_table[slot];
3429 if (bucket.name == 0 && bucket.vec == 0)
3432 str = index->constant_pool + MAYBE_SWAP (bucket.name);
3433 if (!cmp (name, str))
3435 *vec_out = (offset_type *) (index->constant_pool
3436 + MAYBE_SWAP (bucket.vec));
3440 slot = (slot + step) & (index->symbol_table.size () - 1);
3444 /* A helper function that reads the .gdb_index from BUFFER and fills
3445 in MAP. FILENAME is the name of the file containing the data;
3446 it is used for error reporting. DEPRECATED_OK is true if it is
3447 ok to use deprecated sections.
3449 CU_LIST, CU_LIST_ELEMENTS, TYPES_LIST, and TYPES_LIST_ELEMENTS are
3450 out parameters that are filled in with information about the CU and
3451 TU lists in the section.
3453 Returns true if all went well, false otherwise. */
3456 read_gdb_index_from_buffer (struct objfile *objfile,
3457 const char *filename,
3459 gdb::array_view<const gdb_byte> buffer,
3460 struct mapped_index *map,
3461 const gdb_byte **cu_list,
3462 offset_type *cu_list_elements,
3463 const gdb_byte **types_list,
3464 offset_type *types_list_elements)
3466 const gdb_byte *addr = &buffer[0];
3468 /* Version check. */
3469 offset_type version = MAYBE_SWAP (*(offset_type *) addr);
3470 /* Versions earlier than 3 emitted every copy of a psymbol. This
3471 causes the index to behave very poorly for certain requests. Version 3
3472 contained incomplete addrmap. So, it seems better to just ignore such
3476 static int warning_printed = 0;
3477 if (!warning_printed)
3479 warning (_("Skipping obsolete .gdb_index section in %s."),
3481 warning_printed = 1;
3485 /* Index version 4 uses a different hash function than index version
3488 Versions earlier than 6 did not emit psymbols for inlined
3489 functions. Using these files will cause GDB not to be able to
3490 set breakpoints on inlined functions by name, so we ignore these
3491 indices unless the user has done
3492 "set use-deprecated-index-sections on". */
3493 if (version < 6 && !deprecated_ok)
3495 static int warning_printed = 0;
3496 if (!warning_printed)
3499 Skipping deprecated .gdb_index section in %s.\n\
3500 Do \"set use-deprecated-index-sections on\" before the file is read\n\
3501 to use the section anyway."),
3503 warning_printed = 1;
3507 /* Version 7 indices generated by gold refer to the CU for a symbol instead
3508 of the TU (for symbols coming from TUs),
3509 http://sourceware.org/bugzilla/show_bug.cgi?id=15021.
3510 Plus gold-generated indices can have duplicate entries for global symbols,
3511 http://sourceware.org/bugzilla/show_bug.cgi?id=15646.
3512 These are just performance bugs, and we can't distinguish gdb-generated
3513 indices from gold-generated ones, so issue no warning here. */
3515 /* Indexes with higher version than the one supported by GDB may be no
3516 longer backward compatible. */
3520 map->version = version;
3522 offset_type *metadata = (offset_type *) (addr + sizeof (offset_type));
3525 *cu_list = addr + MAYBE_SWAP (metadata[i]);
3526 *cu_list_elements = ((MAYBE_SWAP (metadata[i + 1]) - MAYBE_SWAP (metadata[i]))
3530 *types_list = addr + MAYBE_SWAP (metadata[i]);
3531 *types_list_elements = ((MAYBE_SWAP (metadata[i + 1])
3532 - MAYBE_SWAP (metadata[i]))
3536 const gdb_byte *address_table = addr + MAYBE_SWAP (metadata[i]);
3537 const gdb_byte *address_table_end = addr + MAYBE_SWAP (metadata[i + 1]);
3539 = gdb::array_view<const gdb_byte> (address_table, address_table_end);
3542 const gdb_byte *symbol_table = addr + MAYBE_SWAP (metadata[i]);
3543 const gdb_byte *symbol_table_end = addr + MAYBE_SWAP (metadata[i + 1]);
3545 = gdb::array_view<mapped_index::symbol_table_slot>
3546 ((mapped_index::symbol_table_slot *) symbol_table,
3547 (mapped_index::symbol_table_slot *) symbol_table_end);
3550 map->constant_pool = (char *) (addr + MAYBE_SWAP (metadata[i]));
3555 /* Callback types for dwarf2_read_gdb_index. */
3557 typedef gdb::function_view
3558 <gdb::array_view<const gdb_byte>(objfile *, dwarf2_per_objfile *)>
3559 get_gdb_index_contents_ftype;
3560 typedef gdb::function_view
3561 <gdb::array_view<const gdb_byte>(objfile *, dwz_file *)>
3562 get_gdb_index_contents_dwz_ftype;
3564 /* Read .gdb_index. If everything went ok, initialize the "quick"
3565 elements of all the CUs and return 1. Otherwise, return 0. */
3568 dwarf2_read_gdb_index
3569 (struct dwarf2_per_objfile *dwarf2_per_objfile,
3570 get_gdb_index_contents_ftype get_gdb_index_contents,
3571 get_gdb_index_contents_dwz_ftype get_gdb_index_contents_dwz)
3573 const gdb_byte *cu_list, *types_list, *dwz_list = NULL;
3574 offset_type cu_list_elements, types_list_elements, dwz_list_elements = 0;
3575 struct dwz_file *dwz;
3576 struct objfile *objfile = dwarf2_per_objfile->objfile;
3578 gdb::array_view<const gdb_byte> main_index_contents
3579 = get_gdb_index_contents (objfile, dwarf2_per_objfile);
3581 if (main_index_contents.empty ())
3584 std::unique_ptr<struct mapped_index> map (new struct mapped_index);
3585 if (!read_gdb_index_from_buffer (objfile, objfile_name (objfile),
3586 use_deprecated_index_sections,
3587 main_index_contents, map.get (), &cu_list,
3588 &cu_list_elements, &types_list,
3589 &types_list_elements))
3592 /* Don't use the index if it's empty. */
3593 if (map->symbol_table.empty ())
3596 /* If there is a .dwz file, read it so we can get its CU list as
3598 dwz = dwarf2_get_dwz_file (dwarf2_per_objfile);
3601 struct mapped_index dwz_map;
3602 const gdb_byte *dwz_types_ignore;
3603 offset_type dwz_types_elements_ignore;
3605 gdb::array_view<const gdb_byte> dwz_index_content
3606 = get_gdb_index_contents_dwz (objfile, dwz);
3608 if (dwz_index_content.empty ())
3611 if (!read_gdb_index_from_buffer (objfile,
3612 bfd_get_filename (dwz->dwz_bfd), 1,
3613 dwz_index_content, &dwz_map,
3614 &dwz_list, &dwz_list_elements,
3616 &dwz_types_elements_ignore))
3618 warning (_("could not read '.gdb_index' section from %s; skipping"),
3619 bfd_get_filename (dwz->dwz_bfd));
3624 create_cus_from_index (dwarf2_per_objfile, cu_list, cu_list_elements,
3625 dwz_list, dwz_list_elements);
3627 if (types_list_elements)
3629 struct dwarf2_section_info *section;
3631 /* We can only handle a single .debug_types when we have an
3633 if (VEC_length (dwarf2_section_info_def, dwarf2_per_objfile->types) != 1)
3636 section = VEC_index (dwarf2_section_info_def,
3637 dwarf2_per_objfile->types, 0);
3639 create_signatured_type_table_from_index (dwarf2_per_objfile, section,
3640 types_list, types_list_elements);
3643 create_addrmap_from_index (dwarf2_per_objfile, map.get ());
3645 dwarf2_per_objfile->index_table = std::move (map);
3646 dwarf2_per_objfile->using_index = 1;
3647 dwarf2_per_objfile->quick_file_names_table =
3648 create_quick_file_names_table (dwarf2_per_objfile->all_comp_units.size ());
3653 /* die_reader_func for dw2_get_file_names. */
3656 dw2_get_file_names_reader (const struct die_reader_specs *reader,
3657 const gdb_byte *info_ptr,
3658 struct die_info *comp_unit_die,
3662 struct dwarf2_cu *cu = reader->cu;
3663 struct dwarf2_per_cu_data *this_cu = cu->per_cu;
3664 struct dwarf2_per_objfile *dwarf2_per_objfile
3665 = cu->per_cu->dwarf2_per_objfile;
3666 struct objfile *objfile = dwarf2_per_objfile->objfile;
3667 struct dwarf2_per_cu_data *lh_cu;
3668 struct attribute *attr;
3671 struct quick_file_names *qfn;
3673 gdb_assert (! this_cu->is_debug_types);
3675 /* Our callers never want to match partial units -- instead they
3676 will match the enclosing full CU. */
3677 if (comp_unit_die->tag == DW_TAG_partial_unit)
3679 this_cu->v.quick->no_file_data = 1;
3687 sect_offset line_offset {};
3689 attr = dwarf2_attr (comp_unit_die, DW_AT_stmt_list, cu);
3692 struct quick_file_names find_entry;
3694 line_offset = (sect_offset) DW_UNSND (attr);
3696 /* We may have already read in this line header (TU line header sharing).
3697 If we have we're done. */
3698 find_entry.hash.dwo_unit = cu->dwo_unit;
3699 find_entry.hash.line_sect_off = line_offset;
3700 slot = htab_find_slot (dwarf2_per_objfile->quick_file_names_table,
3701 &find_entry, INSERT);
3704 lh_cu->v.quick->file_names = (struct quick_file_names *) *slot;
3708 lh = dwarf_decode_line_header (line_offset, cu);
3712 lh_cu->v.quick->no_file_data = 1;
3716 qfn = XOBNEW (&objfile->objfile_obstack, struct quick_file_names);
3717 qfn->hash.dwo_unit = cu->dwo_unit;
3718 qfn->hash.line_sect_off = line_offset;
3719 gdb_assert (slot != NULL);
3722 file_and_directory fnd = find_file_and_directory (comp_unit_die, cu);
3724 qfn->num_file_names = lh->file_names.size ();
3726 XOBNEWVEC (&objfile->objfile_obstack, const char *, lh->file_names.size ());
3727 for (i = 0; i < lh->file_names.size (); ++i)
3728 qfn->file_names[i] = file_full_name (i + 1, lh.get (), fnd.comp_dir);
3729 qfn->real_names = NULL;
3731 lh_cu->v.quick->file_names = qfn;
3734 /* A helper for the "quick" functions which attempts to read the line
3735 table for THIS_CU. */
3737 static struct quick_file_names *
3738 dw2_get_file_names (struct dwarf2_per_cu_data *this_cu)
3740 /* This should never be called for TUs. */
3741 gdb_assert (! this_cu->is_debug_types);
3742 /* Nor type unit groups. */
3743 gdb_assert (! IS_TYPE_UNIT_GROUP (this_cu));
3745 if (this_cu->v.quick->file_names != NULL)
3746 return this_cu->v.quick->file_names;
3747 /* If we know there is no line data, no point in looking again. */
3748 if (this_cu->v.quick->no_file_data)
3751 init_cutu_and_read_dies_simple (this_cu, dw2_get_file_names_reader, NULL);
3753 if (this_cu->v.quick->no_file_data)
3755 return this_cu->v.quick->file_names;
3758 /* A helper for the "quick" functions which computes and caches the
3759 real path for a given file name from the line table. */
3762 dw2_get_real_path (struct objfile *objfile,
3763 struct quick_file_names *qfn, int index)
3765 if (qfn->real_names == NULL)
3766 qfn->real_names = OBSTACK_CALLOC (&objfile->objfile_obstack,
3767 qfn->num_file_names, const char *);
3769 if (qfn->real_names[index] == NULL)
3770 qfn->real_names[index] = gdb_realpath (qfn->file_names[index]).release ();
3772 return qfn->real_names[index];
3775 static struct symtab *
3776 dw2_find_last_source_symtab (struct objfile *objfile)
3778 struct dwarf2_per_objfile *dwarf2_per_objfile
3779 = get_dwarf2_per_objfile (objfile);
3780 dwarf2_per_cu_data *dwarf_cu = dwarf2_per_objfile->all_comp_units.back ();
3781 compunit_symtab *cust = dw2_instantiate_symtab (dwarf_cu, false);
3786 return compunit_primary_filetab (cust);
3789 /* Traversal function for dw2_forget_cached_source_info. */
3792 dw2_free_cached_file_names (void **slot, void *info)
3794 struct quick_file_names *file_data = (struct quick_file_names *) *slot;
3796 if (file_data->real_names)
3800 for (i = 0; i < file_data->num_file_names; ++i)
3802 xfree ((void*) file_data->real_names[i]);
3803 file_data->real_names[i] = NULL;
3811 dw2_forget_cached_source_info (struct objfile *objfile)
3813 struct dwarf2_per_objfile *dwarf2_per_objfile
3814 = get_dwarf2_per_objfile (objfile);
3816 htab_traverse_noresize (dwarf2_per_objfile->quick_file_names_table,
3817 dw2_free_cached_file_names, NULL);
3820 /* Helper function for dw2_map_symtabs_matching_filename that expands
3821 the symtabs and calls the iterator. */
3824 dw2_map_expand_apply (struct objfile *objfile,
3825 struct dwarf2_per_cu_data *per_cu,
3826 const char *name, const char *real_path,
3827 gdb::function_view<bool (symtab *)> callback)
3829 struct compunit_symtab *last_made = objfile->compunit_symtabs;
3831 /* Don't visit already-expanded CUs. */
3832 if (per_cu->v.quick->compunit_symtab)
3835 /* This may expand more than one symtab, and we want to iterate over
3837 dw2_instantiate_symtab (per_cu, false);
3839 return iterate_over_some_symtabs (name, real_path, objfile->compunit_symtabs,
3840 last_made, callback);
3843 /* Implementation of the map_symtabs_matching_filename method. */
3846 dw2_map_symtabs_matching_filename
3847 (struct objfile *objfile, const char *name, const char *real_path,
3848 gdb::function_view<bool (symtab *)> callback)
3850 const char *name_basename = lbasename (name);
3851 struct dwarf2_per_objfile *dwarf2_per_objfile
3852 = get_dwarf2_per_objfile (objfile);
3854 /* The rule is CUs specify all the files, including those used by
3855 any TU, so there's no need to scan TUs here. */
3857 for (dwarf2_per_cu_data *per_cu : dwarf2_per_objfile->all_comp_units)
3859 /* We only need to look at symtabs not already expanded. */
3860 if (per_cu->v.quick->compunit_symtab)
3863 quick_file_names *file_data = dw2_get_file_names (per_cu);
3864 if (file_data == NULL)
3867 for (int j = 0; j < file_data->num_file_names; ++j)
3869 const char *this_name = file_data->file_names[j];
3870 const char *this_real_name;
3872 if (compare_filenames_for_search (this_name, name))
3874 if (dw2_map_expand_apply (objfile, per_cu, name, real_path,
3880 /* Before we invoke realpath, which can get expensive when many
3881 files are involved, do a quick comparison of the basenames. */
3882 if (! basenames_may_differ
3883 && FILENAME_CMP (lbasename (this_name), name_basename) != 0)
3886 this_real_name = dw2_get_real_path (objfile, file_data, j);
3887 if (compare_filenames_for_search (this_real_name, name))
3889 if (dw2_map_expand_apply (objfile, per_cu, name, real_path,
3895 if (real_path != NULL)
3897 gdb_assert (IS_ABSOLUTE_PATH (real_path));
3898 gdb_assert (IS_ABSOLUTE_PATH (name));
3899 if (this_real_name != NULL
3900 && FILENAME_CMP (real_path, this_real_name) == 0)
3902 if (dw2_map_expand_apply (objfile, per_cu, name, real_path,
3914 /* Struct used to manage iterating over all CUs looking for a symbol. */
3916 struct dw2_symtab_iterator
3918 /* The dwarf2_per_objfile owning the CUs we are iterating on. */
3919 struct dwarf2_per_objfile *dwarf2_per_objfile;
3920 /* If non-zero, only look for symbols that match BLOCK_INDEX. */
3921 int want_specific_block;
3922 /* One of GLOBAL_BLOCK or STATIC_BLOCK.
3923 Unused if !WANT_SPECIFIC_BLOCK. */
3925 /* The kind of symbol we're looking for. */
3927 /* The list of CUs from the index entry of the symbol,
3928 or NULL if not found. */
3930 /* The next element in VEC to look at. */
3932 /* The number of elements in VEC, or zero if there is no match. */
3934 /* Have we seen a global version of the symbol?
3935 If so we can ignore all further global instances.
3936 This is to work around gold/15646, inefficient gold-generated
3941 /* Initialize the index symtab iterator ITER.
3942 If WANT_SPECIFIC_BLOCK is non-zero, only look for symbols
3943 in block BLOCK_INDEX. Otherwise BLOCK_INDEX is ignored. */
3946 dw2_symtab_iter_init (struct dw2_symtab_iterator *iter,
3947 struct dwarf2_per_objfile *dwarf2_per_objfile,
3948 int want_specific_block,
3953 iter->dwarf2_per_objfile = dwarf2_per_objfile;
3954 iter->want_specific_block = want_specific_block;
3955 iter->block_index = block_index;
3956 iter->domain = domain;
3958 iter->global_seen = 0;
3960 mapped_index *index = dwarf2_per_objfile->index_table.get ();
3962 /* index is NULL if OBJF_READNOW. */
3963 if (index != NULL && find_slot_in_mapped_hash (index, name, &iter->vec))
3964 iter->length = MAYBE_SWAP (*iter->vec);
3972 /* Return the next matching CU or NULL if there are no more. */
3974 static struct dwarf2_per_cu_data *
3975 dw2_symtab_iter_next (struct dw2_symtab_iterator *iter)
3977 struct dwarf2_per_objfile *dwarf2_per_objfile = iter->dwarf2_per_objfile;
3979 for ( ; iter->next < iter->length; ++iter->next)
3981 offset_type cu_index_and_attrs =
3982 MAYBE_SWAP (iter->vec[iter->next + 1]);
3983 offset_type cu_index = GDB_INDEX_CU_VALUE (cu_index_and_attrs);
3984 int want_static = iter->block_index != GLOBAL_BLOCK;
3985 /* This value is only valid for index versions >= 7. */
3986 int is_static = GDB_INDEX_SYMBOL_STATIC_VALUE (cu_index_and_attrs);
3987 gdb_index_symbol_kind symbol_kind =
3988 GDB_INDEX_SYMBOL_KIND_VALUE (cu_index_and_attrs);
3989 /* Only check the symbol attributes if they're present.
3990 Indices prior to version 7 don't record them,
3991 and indices >= 7 may elide them for certain symbols
3992 (gold does this). */
3994 (dwarf2_per_objfile->index_table->version >= 7
3995 && symbol_kind != GDB_INDEX_SYMBOL_KIND_NONE);
3997 /* Don't crash on bad data. */
3998 if (cu_index >= (dwarf2_per_objfile->all_comp_units.size ()
3999 + dwarf2_per_objfile->all_type_units.size ()))
4001 complaint (_(".gdb_index entry has bad CU index"
4003 objfile_name (dwarf2_per_objfile->objfile));
4007 dwarf2_per_cu_data *per_cu = dwarf2_per_objfile->get_cutu (cu_index);
4009 /* Skip if already read in. */
4010 if (per_cu->v.quick->compunit_symtab)
4013 /* Check static vs global. */
4016 if (iter->want_specific_block
4017 && want_static != is_static)
4019 /* Work around gold/15646. */
4020 if (!is_static && iter->global_seen)
4023 iter->global_seen = 1;
4026 /* Only check the symbol's kind if it has one. */
4029 switch (iter->domain)
4032 if (symbol_kind != GDB_INDEX_SYMBOL_KIND_VARIABLE
4033 && symbol_kind != GDB_INDEX_SYMBOL_KIND_FUNCTION
4034 /* Some types are also in VAR_DOMAIN. */
4035 && symbol_kind != GDB_INDEX_SYMBOL_KIND_TYPE)
4039 if (symbol_kind != GDB_INDEX_SYMBOL_KIND_TYPE)
4043 if (symbol_kind != GDB_INDEX_SYMBOL_KIND_OTHER)
4058 static struct compunit_symtab *
4059 dw2_lookup_symbol (struct objfile *objfile, int block_index,
4060 const char *name, domain_enum domain)
4062 struct compunit_symtab *stab_best = NULL;
4063 struct dwarf2_per_objfile *dwarf2_per_objfile
4064 = get_dwarf2_per_objfile (objfile);
4066 lookup_name_info lookup_name (name, symbol_name_match_type::FULL);
4068 struct dw2_symtab_iterator iter;
4069 struct dwarf2_per_cu_data *per_cu;
4071 dw2_symtab_iter_init (&iter, dwarf2_per_objfile, 1, block_index, domain, name);
4073 while ((per_cu = dw2_symtab_iter_next (&iter)) != NULL)
4075 struct symbol *sym, *with_opaque = NULL;
4076 struct compunit_symtab *stab = dw2_instantiate_symtab (per_cu, false);
4077 const struct blockvector *bv = COMPUNIT_BLOCKVECTOR (stab);
4078 const struct block *block = BLOCKVECTOR_BLOCK (bv, block_index);
4080 sym = block_find_symbol (block, name, domain,
4081 block_find_non_opaque_type_preferred,
4084 /* Some caution must be observed with overloaded functions
4085 and methods, since the index will not contain any overload
4086 information (but NAME might contain it). */
4089 && SYMBOL_MATCHES_SEARCH_NAME (sym, lookup_name))
4091 if (with_opaque != NULL
4092 && SYMBOL_MATCHES_SEARCH_NAME (with_opaque, lookup_name))
4095 /* Keep looking through other CUs. */
4102 dw2_print_stats (struct objfile *objfile)
4104 struct dwarf2_per_objfile *dwarf2_per_objfile
4105 = get_dwarf2_per_objfile (objfile);
4106 int total = (dwarf2_per_objfile->all_comp_units.size ()
4107 + dwarf2_per_objfile->all_type_units.size ());
4110 for (int i = 0; i < total; ++i)
4112 dwarf2_per_cu_data *per_cu = dwarf2_per_objfile->get_cutu (i);
4114 if (!per_cu->v.quick->compunit_symtab)
4117 printf_filtered (_(" Number of read CUs: %d\n"), total - count);
4118 printf_filtered (_(" Number of unread CUs: %d\n"), count);
4121 /* This dumps minimal information about the index.
4122 It is called via "mt print objfiles".
4123 One use is to verify .gdb_index has been loaded by the
4124 gdb.dwarf2/gdb-index.exp testcase. */
4127 dw2_dump (struct objfile *objfile)
4129 struct dwarf2_per_objfile *dwarf2_per_objfile
4130 = get_dwarf2_per_objfile (objfile);
4132 gdb_assert (dwarf2_per_objfile->using_index);
4133 printf_filtered (".gdb_index:");
4134 if (dwarf2_per_objfile->index_table != NULL)
4136 printf_filtered (" version %d\n",
4137 dwarf2_per_objfile->index_table->version);
4140 printf_filtered (" faked for \"readnow\"\n");
4141 printf_filtered ("\n");
4145 dw2_expand_symtabs_for_function (struct objfile *objfile,
4146 const char *func_name)
4148 struct dwarf2_per_objfile *dwarf2_per_objfile
4149 = get_dwarf2_per_objfile (objfile);
4151 struct dw2_symtab_iterator iter;
4152 struct dwarf2_per_cu_data *per_cu;
4154 /* Note: It doesn't matter what we pass for block_index here. */
4155 dw2_symtab_iter_init (&iter, dwarf2_per_objfile, 0, GLOBAL_BLOCK, VAR_DOMAIN,
4158 while ((per_cu = dw2_symtab_iter_next (&iter)) != NULL)
4159 dw2_instantiate_symtab (per_cu, false);
4164 dw2_expand_all_symtabs (struct objfile *objfile)
4166 struct dwarf2_per_objfile *dwarf2_per_objfile
4167 = get_dwarf2_per_objfile (objfile);
4168 int total_units = (dwarf2_per_objfile->all_comp_units.size ()
4169 + dwarf2_per_objfile->all_type_units.size ());
4171 for (int i = 0; i < total_units; ++i)
4173 dwarf2_per_cu_data *per_cu = dwarf2_per_objfile->get_cutu (i);
4175 /* We don't want to directly expand a partial CU, because if we
4176 read it with the wrong language, then assertion failures can
4177 be triggered later on. See PR symtab/23010. So, tell
4178 dw2_instantiate_symtab to skip partial CUs -- any important
4179 partial CU will be read via DW_TAG_imported_unit anyway. */
4180 dw2_instantiate_symtab (per_cu, true);
4185 dw2_expand_symtabs_with_fullname (struct objfile *objfile,
4186 const char *fullname)
4188 struct dwarf2_per_objfile *dwarf2_per_objfile
4189 = get_dwarf2_per_objfile (objfile);
4191 /* We don't need to consider type units here.
4192 This is only called for examining code, e.g. expand_line_sal.
4193 There can be an order of magnitude (or more) more type units
4194 than comp units, and we avoid them if we can. */
4196 for (dwarf2_per_cu_data *per_cu : dwarf2_per_objfile->all_comp_units)
4198 /* We only need to look at symtabs not already expanded. */
4199 if (per_cu->v.quick->compunit_symtab)
4202 quick_file_names *file_data = dw2_get_file_names (per_cu);
4203 if (file_data == NULL)
4206 for (int j = 0; j < file_data->num_file_names; ++j)
4208 const char *this_fullname = file_data->file_names[j];
4210 if (filename_cmp (this_fullname, fullname) == 0)
4212 dw2_instantiate_symtab (per_cu, false);
4220 dw2_map_matching_symbols (struct objfile *objfile,
4221 const char * name, domain_enum domain,
4223 int (*callback) (const struct block *,
4224 struct symbol *, void *),
4225 void *data, symbol_name_match_type match,
4226 symbol_compare_ftype *ordered_compare)
4228 /* Currently unimplemented; used for Ada. The function can be called if the
4229 current language is Ada for a non-Ada objfile using GNU index. As Ada
4230 does not look for non-Ada symbols this function should just return. */
4233 /* Symbol name matcher for .gdb_index names.
4235 Symbol names in .gdb_index have a few particularities:
4237 - There's no indication of which is the language of each symbol.
4239 Since each language has its own symbol name matching algorithm,
4240 and we don't know which language is the right one, we must match
4241 each symbol against all languages. This would be a potential
4242 performance problem if it were not mitigated by the
4243 mapped_index::name_components lookup table, which significantly
4244 reduces the number of times we need to call into this matcher,
4245 making it a non-issue.
4247 - Symbol names in the index have no overload (parameter)
4248 information. I.e., in C++, "foo(int)" and "foo(long)" both
4249 appear as "foo" in the index, for example.
4251 This means that the lookup names passed to the symbol name
4252 matcher functions must have no parameter information either
4253 because (e.g.) symbol search name "foo" does not match
4254 lookup-name "foo(int)" [while swapping search name for lookup
4257 class gdb_index_symbol_name_matcher
4260 /* Prepares the vector of comparison functions for LOOKUP_NAME. */
4261 gdb_index_symbol_name_matcher (const lookup_name_info &lookup_name);
4263 /* Walk all the matcher routines and match SYMBOL_NAME against them.
4264 Returns true if any matcher matches. */
4265 bool matches (const char *symbol_name);
4268 /* A reference to the lookup name we're matching against. */
4269 const lookup_name_info &m_lookup_name;
4271 /* A vector holding all the different symbol name matchers, for all
4273 std::vector<symbol_name_matcher_ftype *> m_symbol_name_matcher_funcs;
4276 gdb_index_symbol_name_matcher::gdb_index_symbol_name_matcher
4277 (const lookup_name_info &lookup_name)
4278 : m_lookup_name (lookup_name)
4280 /* Prepare the vector of comparison functions upfront, to avoid
4281 doing the same work for each symbol. Care is taken to avoid
4282 matching with the same matcher more than once if/when multiple
4283 languages use the same matcher function. */
4284 auto &matchers = m_symbol_name_matcher_funcs;
4285 matchers.reserve (nr_languages);
4287 matchers.push_back (default_symbol_name_matcher);
4289 for (int i = 0; i < nr_languages; i++)
4291 const language_defn *lang = language_def ((enum language) i);
4292 symbol_name_matcher_ftype *name_matcher
4293 = get_symbol_name_matcher (lang, m_lookup_name);
4295 /* Don't insert the same comparison routine more than once.
4296 Note that we do this linear walk instead of a seemingly
4297 cheaper sorted insert, or use a std::set or something like
4298 that, because relative order of function addresses is not
4299 stable. This is not a problem in practice because the number
4300 of supported languages is low, and the cost here is tiny
4301 compared to the number of searches we'll do afterwards using
4303 if (name_matcher != default_symbol_name_matcher
4304 && (std::find (matchers.begin (), matchers.end (), name_matcher)
4305 == matchers.end ()))
4306 matchers.push_back (name_matcher);
4311 gdb_index_symbol_name_matcher::matches (const char *symbol_name)
4313 for (auto matches_name : m_symbol_name_matcher_funcs)
4314 if (matches_name (symbol_name, m_lookup_name, NULL))
4320 /* Starting from a search name, return the string that finds the upper
4321 bound of all strings that start with SEARCH_NAME in a sorted name
4322 list. Returns the empty string to indicate that the upper bound is
4323 the end of the list. */
4326 make_sort_after_prefix_name (const char *search_name)
4328 /* When looking to complete "func", we find the upper bound of all
4329 symbols that start with "func" by looking for where we'd insert
4330 the closest string that would follow "func" in lexicographical
4331 order. Usually, that's "func"-with-last-character-incremented,
4332 i.e. "fund". Mind non-ASCII characters, though. Usually those
4333 will be UTF-8 multi-byte sequences, but we can't be certain.
4334 Especially mind the 0xff character, which is a valid character in
4335 non-UTF-8 source character sets (e.g. Latin1 'ÿ'), and we can't
4336 rule out compilers allowing it in identifiers. Note that
4337 conveniently, strcmp/strcasecmp are specified to compare
4338 characters interpreted as unsigned char. So what we do is treat
4339 the whole string as a base 256 number composed of a sequence of
4340 base 256 "digits" and add 1 to it. I.e., adding 1 to 0xff wraps
4341 to 0, and carries 1 to the following more-significant position.
4342 If the very first character in SEARCH_NAME ends up incremented
4343 and carries/overflows, then the upper bound is the end of the
4344 list. The string after the empty string is also the empty
4347 Some examples of this operation:
4349 SEARCH_NAME => "+1" RESULT
4353 "\xff" "a" "\xff" => "\xff" "b"
4358 Then, with these symbols for example:
4364 completing "func" looks for symbols between "func" and
4365 "func"-with-last-character-incremented, i.e. "fund" (exclusive),
4366 which finds "func" and "func1", but not "fund".
4370 funcÿ (Latin1 'ÿ' [0xff])
4374 completing "funcÿ" looks for symbols between "funcÿ" and "fund"
4375 (exclusive), which finds "funcÿ" and "funcÿ1", but not "fund".
4379 ÿÿ (Latin1 'ÿ' [0xff])
4382 completing "ÿ" or "ÿÿ" looks for symbols between between "ÿÿ" and
4383 the end of the list.
4385 std::string after = search_name;
4386 while (!after.empty () && (unsigned char) after.back () == 0xff)
4388 if (!after.empty ())
4389 after.back () = (unsigned char) after.back () + 1;
4393 /* See declaration. */
4395 std::pair<std::vector<name_component>::const_iterator,
4396 std::vector<name_component>::const_iterator>
4397 mapped_index_base::find_name_components_bounds
4398 (const lookup_name_info &lookup_name_without_params) const
4401 = this->name_components_casing == case_sensitive_on ? strcmp : strcasecmp;
4404 = lookup_name_without_params.cplus ().lookup_name ().c_str ();
4406 /* Comparison function object for lower_bound that matches against a
4407 given symbol name. */
4408 auto lookup_compare_lower = [&] (const name_component &elem,
4411 const char *elem_qualified = this->symbol_name_at (elem.idx);
4412 const char *elem_name = elem_qualified + elem.name_offset;
4413 return name_cmp (elem_name, name) < 0;
4416 /* Comparison function object for upper_bound that matches against a
4417 given symbol name. */
4418 auto lookup_compare_upper = [&] (const char *name,
4419 const name_component &elem)
4421 const char *elem_qualified = this->symbol_name_at (elem.idx);
4422 const char *elem_name = elem_qualified + elem.name_offset;
4423 return name_cmp (name, elem_name) < 0;
4426 auto begin = this->name_components.begin ();
4427 auto end = this->name_components.end ();
4429 /* Find the lower bound. */
4432 if (lookup_name_without_params.completion_mode () && cplus[0] == '\0')
4435 return std::lower_bound (begin, end, cplus, lookup_compare_lower);
4438 /* Find the upper bound. */
4441 if (lookup_name_without_params.completion_mode ())
4443 /* In completion mode, we want UPPER to point past all
4444 symbols names that have the same prefix. I.e., with
4445 these symbols, and completing "func":
4447 function << lower bound
4449 other_function << upper bound
4451 We find the upper bound by looking for the insertion
4452 point of "func"-with-last-character-incremented,
4454 std::string after = make_sort_after_prefix_name (cplus);
4457 return std::lower_bound (lower, end, after.c_str (),
4458 lookup_compare_lower);
4461 return std::upper_bound (lower, end, cplus, lookup_compare_upper);
4464 return {lower, upper};
4467 /* See declaration. */
4470 mapped_index_base::build_name_components ()
4472 if (!this->name_components.empty ())
4475 this->name_components_casing = case_sensitivity;
4477 = this->name_components_casing == case_sensitive_on ? strcmp : strcasecmp;
4479 /* The code below only knows how to break apart components of C++
4480 symbol names (and other languages that use '::' as
4481 namespace/module separator). If we add support for wild matching
4482 to some language that uses some other operator (E.g., Ada, Go and
4483 D use '.'), then we'll need to try splitting the symbol name
4484 according to that language too. Note that Ada does support wild
4485 matching, but doesn't currently support .gdb_index. */
4486 auto count = this->symbol_name_count ();
4487 for (offset_type idx = 0; idx < count; idx++)
4489 if (this->symbol_name_slot_invalid (idx))
4492 const char *name = this->symbol_name_at (idx);
4494 /* Add each name component to the name component table. */
4495 unsigned int previous_len = 0;
4496 for (unsigned int current_len = cp_find_first_component (name);
4497 name[current_len] != '\0';
4498 current_len += cp_find_first_component (name + current_len))
4500 gdb_assert (name[current_len] == ':');
4501 this->name_components.push_back ({previous_len, idx});
4502 /* Skip the '::'. */
4504 previous_len = current_len;
4506 this->name_components.push_back ({previous_len, idx});
4509 /* Sort name_components elements by name. */
4510 auto name_comp_compare = [&] (const name_component &left,
4511 const name_component &right)
4513 const char *left_qualified = this->symbol_name_at (left.idx);
4514 const char *right_qualified = this->symbol_name_at (right.idx);
4516 const char *left_name = left_qualified + left.name_offset;
4517 const char *right_name = right_qualified + right.name_offset;
4519 return name_cmp (left_name, right_name) < 0;
4522 std::sort (this->name_components.begin (),
4523 this->name_components.end (),
4527 /* Helper for dw2_expand_symtabs_matching that works with a
4528 mapped_index_base instead of the containing objfile. This is split
4529 to a separate function in order to be able to unit test the
4530 name_components matching using a mock mapped_index_base. For each
4531 symbol name that matches, calls MATCH_CALLBACK, passing it the
4532 symbol's index in the mapped_index_base symbol table. */
4535 dw2_expand_symtabs_matching_symbol
4536 (mapped_index_base &index,
4537 const lookup_name_info &lookup_name_in,
4538 gdb::function_view<expand_symtabs_symbol_matcher_ftype> symbol_matcher,
4539 enum search_domain kind,
4540 gdb::function_view<void (offset_type)> match_callback)
4542 lookup_name_info lookup_name_without_params
4543 = lookup_name_in.make_ignore_params ();
4544 gdb_index_symbol_name_matcher lookup_name_matcher
4545 (lookup_name_without_params);
4547 /* Build the symbol name component sorted vector, if we haven't
4549 index.build_name_components ();
4551 auto bounds = index.find_name_components_bounds (lookup_name_without_params);
4553 /* Now for each symbol name in range, check to see if we have a name
4554 match, and if so, call the MATCH_CALLBACK callback. */
4556 /* The same symbol may appear more than once in the range though.
4557 E.g., if we're looking for symbols that complete "w", and we have
4558 a symbol named "w1::w2", we'll find the two name components for
4559 that same symbol in the range. To be sure we only call the
4560 callback once per symbol, we first collect the symbol name
4561 indexes that matched in a temporary vector and ignore
4563 std::vector<offset_type> matches;
4564 matches.reserve (std::distance (bounds.first, bounds.second));
4566 for (; bounds.first != bounds.second; ++bounds.first)
4568 const char *qualified = index.symbol_name_at (bounds.first->idx);
4570 if (!lookup_name_matcher.matches (qualified)
4571 || (symbol_matcher != NULL && !symbol_matcher (qualified)))
4574 matches.push_back (bounds.first->idx);
4577 std::sort (matches.begin (), matches.end ());
4579 /* Finally call the callback, once per match. */
4581 for (offset_type idx : matches)
4585 match_callback (idx);
4590 /* Above we use a type wider than idx's for 'prev', since 0 and
4591 (offset_type)-1 are both possible values. */
4592 static_assert (sizeof (prev) > sizeof (offset_type), "");
4597 namespace selftests { namespace dw2_expand_symtabs_matching {
4599 /* A mock .gdb_index/.debug_names-like name index table, enough to
4600 exercise dw2_expand_symtabs_matching_symbol, which works with the
4601 mapped_index_base interface. Builds an index from the symbol list
4602 passed as parameter to the constructor. */
4603 class mock_mapped_index : public mapped_index_base
4606 mock_mapped_index (gdb::array_view<const char *> symbols)
4607 : m_symbol_table (symbols)
4610 DISABLE_COPY_AND_ASSIGN (mock_mapped_index);
4612 /* Return the number of names in the symbol table. */
4613 size_t symbol_name_count () const override
4615 return m_symbol_table.size ();
4618 /* Get the name of the symbol at IDX in the symbol table. */
4619 const char *symbol_name_at (offset_type idx) const override
4621 return m_symbol_table[idx];
4625 gdb::array_view<const char *> m_symbol_table;
4628 /* Convenience function that converts a NULL pointer to a "<null>"
4629 string, to pass to print routines. */
4632 string_or_null (const char *str)
4634 return str != NULL ? str : "<null>";
4637 /* Check if a lookup_name_info built from
4638 NAME/MATCH_TYPE/COMPLETION_MODE matches the symbols in the mock
4639 index. EXPECTED_LIST is the list of expected matches, in expected
4640 matching order. If no match expected, then an empty list is
4641 specified. Returns true on success. On failure prints a warning
4642 indicating the file:line that failed, and returns false. */
4645 check_match (const char *file, int line,
4646 mock_mapped_index &mock_index,
4647 const char *name, symbol_name_match_type match_type,
4648 bool completion_mode,
4649 std::initializer_list<const char *> expected_list)
4651 lookup_name_info lookup_name (name, match_type, completion_mode);
4653 bool matched = true;
4655 auto mismatch = [&] (const char *expected_str,
4658 warning (_("%s:%d: match_type=%s, looking-for=\"%s\", "
4659 "expected=\"%s\", got=\"%s\"\n"),
4661 (match_type == symbol_name_match_type::FULL
4663 name, string_or_null (expected_str), string_or_null (got));
4667 auto expected_it = expected_list.begin ();
4668 auto expected_end = expected_list.end ();
4670 dw2_expand_symtabs_matching_symbol (mock_index, lookup_name,
4672 [&] (offset_type idx)
4674 const char *matched_name = mock_index.symbol_name_at (idx);
4675 const char *expected_str
4676 = expected_it == expected_end ? NULL : *expected_it++;
4678 if (expected_str == NULL || strcmp (expected_str, matched_name) != 0)
4679 mismatch (expected_str, matched_name);
4682 const char *expected_str
4683 = expected_it == expected_end ? NULL : *expected_it++;
4684 if (expected_str != NULL)
4685 mismatch (expected_str, NULL);
4690 /* The symbols added to the mock mapped_index for testing (in
4692 static const char *test_symbols[] = {
4701 "ns2::tmpl<int>::foo2",
4702 "(anonymous namespace)::A::B::C",
4704 /* These are used to check that the increment-last-char in the
4705 matching algorithm for completion doesn't match "t1_fund" when
4706 completing "t1_func". */
4712 /* A UTF-8 name with multi-byte sequences to make sure that
4713 cp-name-parser understands this as a single identifier ("função"
4714 is "function" in PT). */
4717 /* \377 (0xff) is Latin1 'ÿ'. */
4720 /* \377 (0xff) is Latin1 'ÿ'. */
4724 /* A name with all sorts of complications. Starts with "z" to make
4725 it easier for the completion tests below. */
4726 #define Z_SYM_NAME \
4727 "z::std::tuple<(anonymous namespace)::ui*, std::bar<(anonymous namespace)::ui> >" \
4728 "::tuple<(anonymous namespace)::ui*, " \
4729 "std::default_delete<(anonymous namespace)::ui>, void>"
4734 /* Returns true if the mapped_index_base::find_name_component_bounds
4735 method finds EXPECTED_SYMS in INDEX when looking for SEARCH_NAME,
4736 in completion mode. */
4739 check_find_bounds_finds (mapped_index_base &index,
4740 const char *search_name,
4741 gdb::array_view<const char *> expected_syms)
4743 lookup_name_info lookup_name (search_name,
4744 symbol_name_match_type::FULL, true);
4746 auto bounds = index.find_name_components_bounds (lookup_name);
4748 size_t distance = std::distance (bounds.first, bounds.second);
4749 if (distance != expected_syms.size ())
4752 for (size_t exp_elem = 0; exp_elem < distance; exp_elem++)
4754 auto nc_elem = bounds.first + exp_elem;
4755 const char *qualified = index.symbol_name_at (nc_elem->idx);
4756 if (strcmp (qualified, expected_syms[exp_elem]) != 0)
4763 /* Test the lower-level mapped_index::find_name_component_bounds
4767 test_mapped_index_find_name_component_bounds ()
4769 mock_mapped_index mock_index (test_symbols);
4771 mock_index.build_name_components ();
4773 /* Test the lower-level mapped_index::find_name_component_bounds
4774 method in completion mode. */
4776 static const char *expected_syms[] = {
4781 SELF_CHECK (check_find_bounds_finds (mock_index,
4782 "t1_func", expected_syms));
4785 /* Check that the increment-last-char in the name matching algorithm
4786 for completion doesn't get confused with Ansi1 'ÿ' / 0xff. */
4788 static const char *expected_syms1[] = {
4792 SELF_CHECK (check_find_bounds_finds (mock_index,
4793 "\377", expected_syms1));
4795 static const char *expected_syms2[] = {
4798 SELF_CHECK (check_find_bounds_finds (mock_index,
4799 "\377\377", expected_syms2));
4803 /* Test dw2_expand_symtabs_matching_symbol. */
4806 test_dw2_expand_symtabs_matching_symbol ()
4808 mock_mapped_index mock_index (test_symbols);
4810 /* We let all tests run until the end even if some fails, for debug
4812 bool any_mismatch = false;
4814 /* Create the expected symbols list (an initializer_list). Needed
4815 because lists have commas, and we need to pass them to CHECK,
4816 which is a macro. */
4817 #define EXPECT(...) { __VA_ARGS__ }
4819 /* Wrapper for check_match that passes down the current
4820 __FILE__/__LINE__. */
4821 #define CHECK_MATCH(NAME, MATCH_TYPE, COMPLETION_MODE, EXPECTED_LIST) \
4822 any_mismatch |= !check_match (__FILE__, __LINE__, \
4824 NAME, MATCH_TYPE, COMPLETION_MODE, \
4827 /* Identity checks. */
4828 for (const char *sym : test_symbols)
4830 /* Should be able to match all existing symbols. */
4831 CHECK_MATCH (sym, symbol_name_match_type::FULL, false,
4834 /* Should be able to match all existing symbols with
4836 std::string with_params = std::string (sym) + "(int)";
4837 CHECK_MATCH (with_params.c_str (), symbol_name_match_type::FULL, false,
4840 /* Should be able to match all existing symbols with
4841 parameters and qualifiers. */
4842 with_params = std::string (sym) + " ( int ) const";
4843 CHECK_MATCH (with_params.c_str (), symbol_name_match_type::FULL, false,
4846 /* This should really find sym, but cp-name-parser.y doesn't
4847 know about lvalue/rvalue qualifiers yet. */
4848 with_params = std::string (sym) + " ( int ) &&";
4849 CHECK_MATCH (with_params.c_str (), symbol_name_match_type::FULL, false,
4853 /* Check that the name matching algorithm for completion doesn't get
4854 confused with Latin1 'ÿ' / 0xff. */
4856 static const char str[] = "\377";
4857 CHECK_MATCH (str, symbol_name_match_type::FULL, true,
4858 EXPECT ("\377", "\377\377123"));
4861 /* Check that the increment-last-char in the matching algorithm for
4862 completion doesn't match "t1_fund" when completing "t1_func". */
4864 static const char str[] = "t1_func";
4865 CHECK_MATCH (str, symbol_name_match_type::FULL, true,
4866 EXPECT ("t1_func", "t1_func1"));
4869 /* Check that completion mode works at each prefix of the expected
4872 static const char str[] = "function(int)";
4873 size_t len = strlen (str);
4876 for (size_t i = 1; i < len; i++)
4878 lookup.assign (str, i);
4879 CHECK_MATCH (lookup.c_str (), symbol_name_match_type::FULL, true,
4880 EXPECT ("function"));
4884 /* While "w" is a prefix of both components, the match function
4885 should still only be called once. */
4887 CHECK_MATCH ("w", symbol_name_match_type::FULL, true,
4889 CHECK_MATCH ("w", symbol_name_match_type::WILD, true,
4893 /* Same, with a "complicated" symbol. */
4895 static const char str[] = Z_SYM_NAME;
4896 size_t len = strlen (str);
4899 for (size_t i = 1; i < len; i++)
4901 lookup.assign (str, i);
4902 CHECK_MATCH (lookup.c_str (), symbol_name_match_type::FULL, true,
4903 EXPECT (Z_SYM_NAME));
4907 /* In FULL mode, an incomplete symbol doesn't match. */
4909 CHECK_MATCH ("std::zfunction(int", symbol_name_match_type::FULL, false,
4913 /* A complete symbol with parameters matches any overload, since the
4914 index has no overload info. */
4916 CHECK_MATCH ("std::zfunction(int)", symbol_name_match_type::FULL, true,
4917 EXPECT ("std::zfunction", "std::zfunction2"));
4918 CHECK_MATCH ("zfunction(int)", symbol_name_match_type::WILD, true,
4919 EXPECT ("std::zfunction", "std::zfunction2"));
4920 CHECK_MATCH ("zfunc", symbol_name_match_type::WILD, true,
4921 EXPECT ("std::zfunction", "std::zfunction2"));
4924 /* Check that whitespace is ignored appropriately. A symbol with a
4925 template argument list. */
4927 static const char expected[] = "ns::foo<int>";
4928 CHECK_MATCH ("ns :: foo < int > ", symbol_name_match_type::FULL, false,
4930 CHECK_MATCH ("foo < int > ", symbol_name_match_type::WILD, false,
4934 /* Check that whitespace is ignored appropriately. A symbol with a
4935 template argument list that includes a pointer. */
4937 static const char expected[] = "ns::foo<char*>";
4938 /* Try both completion and non-completion modes. */
4939 static const bool completion_mode[2] = {false, true};
4940 for (size_t i = 0; i < 2; i++)
4942 CHECK_MATCH ("ns :: foo < char * >", symbol_name_match_type::FULL,
4943 completion_mode[i], EXPECT (expected));
4944 CHECK_MATCH ("foo < char * >", symbol_name_match_type::WILD,
4945 completion_mode[i], EXPECT (expected));
4947 CHECK_MATCH ("ns :: foo < char * > (int)", symbol_name_match_type::FULL,
4948 completion_mode[i], EXPECT (expected));
4949 CHECK_MATCH ("foo < char * > (int)", symbol_name_match_type::WILD,
4950 completion_mode[i], EXPECT (expected));
4955 /* Check method qualifiers are ignored. */
4956 static const char expected[] = "ns::foo<char*>";
4957 CHECK_MATCH ("ns :: foo < char * > ( int ) const",
4958 symbol_name_match_type::FULL, true, EXPECT (expected));
4959 CHECK_MATCH ("ns :: foo < char * > ( int ) &&",
4960 symbol_name_match_type::FULL, true, EXPECT (expected));
4961 CHECK_MATCH ("foo < char * > ( int ) const",
4962 symbol_name_match_type::WILD, true, EXPECT (expected));
4963 CHECK_MATCH ("foo < char * > ( int ) &&",
4964 symbol_name_match_type::WILD, true, EXPECT (expected));
4967 /* Test lookup names that don't match anything. */
4969 CHECK_MATCH ("bar2", symbol_name_match_type::WILD, false,
4972 CHECK_MATCH ("doesntexist", symbol_name_match_type::FULL, false,
4976 /* Some wild matching tests, exercising "(anonymous namespace)",
4977 which should not be confused with a parameter list. */
4979 static const char *syms[] = {
4983 "A :: B :: C ( int )",
4988 for (const char *s : syms)
4990 CHECK_MATCH (s, symbol_name_match_type::WILD, false,
4991 EXPECT ("(anonymous namespace)::A::B::C"));
4996 static const char expected[] = "ns2::tmpl<int>::foo2";
4997 CHECK_MATCH ("tmp", symbol_name_match_type::WILD, true,
4999 CHECK_MATCH ("tmpl<", symbol_name_match_type::WILD, true,
5003 SELF_CHECK (!any_mismatch);
5012 test_mapped_index_find_name_component_bounds ();
5013 test_dw2_expand_symtabs_matching_symbol ();
5016 }} // namespace selftests::dw2_expand_symtabs_matching
5018 #endif /* GDB_SELF_TEST */
5020 /* If FILE_MATCHER is NULL or if PER_CU has
5021 dwarf2_per_cu_quick_data::MARK set (see
5022 dw_expand_symtabs_matching_file_matcher), expand the CU and call
5023 EXPANSION_NOTIFY on it. */
5026 dw2_expand_symtabs_matching_one
5027 (struct dwarf2_per_cu_data *per_cu,
5028 gdb::function_view<expand_symtabs_file_matcher_ftype> file_matcher,
5029 gdb::function_view<expand_symtabs_exp_notify_ftype> expansion_notify)
5031 if (file_matcher == NULL || per_cu->v.quick->mark)
5033 bool symtab_was_null
5034 = (per_cu->v.quick->compunit_symtab == NULL);
5036 dw2_instantiate_symtab (per_cu, false);
5038 if (expansion_notify != NULL
5040 && per_cu->v.quick->compunit_symtab != NULL)
5041 expansion_notify (per_cu->v.quick->compunit_symtab);
5045 /* Helper for dw2_expand_matching symtabs. Called on each symbol
5046 matched, to expand corresponding CUs that were marked. IDX is the
5047 index of the symbol name that matched. */
5050 dw2_expand_marked_cus
5051 (struct dwarf2_per_objfile *dwarf2_per_objfile, offset_type idx,
5052 gdb::function_view<expand_symtabs_file_matcher_ftype> file_matcher,
5053 gdb::function_view<expand_symtabs_exp_notify_ftype> expansion_notify,
5056 offset_type *vec, vec_len, vec_idx;
5057 bool global_seen = false;
5058 mapped_index &index = *dwarf2_per_objfile->index_table;
5060 vec = (offset_type *) (index.constant_pool
5061 + MAYBE_SWAP (index.symbol_table[idx].vec));
5062 vec_len = MAYBE_SWAP (vec[0]);
5063 for (vec_idx = 0; vec_idx < vec_len; ++vec_idx)
5065 offset_type cu_index_and_attrs = MAYBE_SWAP (vec[vec_idx + 1]);
5066 /* This value is only valid for index versions >= 7. */
5067 int is_static = GDB_INDEX_SYMBOL_STATIC_VALUE (cu_index_and_attrs);
5068 gdb_index_symbol_kind symbol_kind =
5069 GDB_INDEX_SYMBOL_KIND_VALUE (cu_index_and_attrs);
5070 int cu_index = GDB_INDEX_CU_VALUE (cu_index_and_attrs);
5071 /* Only check the symbol attributes if they're present.
5072 Indices prior to version 7 don't record them,
5073 and indices >= 7 may elide them for certain symbols
5074 (gold does this). */
5077 && symbol_kind != GDB_INDEX_SYMBOL_KIND_NONE);
5079 /* Work around gold/15646. */
5082 if (!is_static && global_seen)
5088 /* Only check the symbol's kind if it has one. */
5093 case VARIABLES_DOMAIN:
5094 if (symbol_kind != GDB_INDEX_SYMBOL_KIND_VARIABLE)
5097 case FUNCTIONS_DOMAIN:
5098 if (symbol_kind != GDB_INDEX_SYMBOL_KIND_FUNCTION)
5102 if (symbol_kind != GDB_INDEX_SYMBOL_KIND_TYPE)
5110 /* Don't crash on bad data. */
5111 if (cu_index >= (dwarf2_per_objfile->all_comp_units.size ()
5112 + dwarf2_per_objfile->all_type_units.size ()))
5114 complaint (_(".gdb_index entry has bad CU index"
5116 objfile_name (dwarf2_per_objfile->objfile));
5120 dwarf2_per_cu_data *per_cu = dwarf2_per_objfile->get_cutu (cu_index);
5121 dw2_expand_symtabs_matching_one (per_cu, file_matcher,
5126 /* If FILE_MATCHER is non-NULL, set all the
5127 dwarf2_per_cu_quick_data::MARK of the current DWARF2_PER_OBJFILE
5128 that match FILE_MATCHER. */
5131 dw_expand_symtabs_matching_file_matcher
5132 (struct dwarf2_per_objfile *dwarf2_per_objfile,
5133 gdb::function_view<expand_symtabs_file_matcher_ftype> file_matcher)
5135 if (file_matcher == NULL)
5138 objfile *const objfile = dwarf2_per_objfile->objfile;
5140 htab_up visited_found (htab_create_alloc (10, htab_hash_pointer,
5142 NULL, xcalloc, xfree));
5143 htab_up visited_not_found (htab_create_alloc (10, htab_hash_pointer,
5145 NULL, xcalloc, xfree));
5147 /* The rule is CUs specify all the files, including those used by
5148 any TU, so there's no need to scan TUs here. */
5150 for (dwarf2_per_cu_data *per_cu : dwarf2_per_objfile->all_comp_units)
5154 per_cu->v.quick->mark = 0;
5156 /* We only need to look at symtabs not already expanded. */
5157 if (per_cu->v.quick->compunit_symtab)
5160 quick_file_names *file_data = dw2_get_file_names (per_cu);
5161 if (file_data == NULL)
5164 if (htab_find (visited_not_found.get (), file_data) != NULL)
5166 else if (htab_find (visited_found.get (), file_data) != NULL)
5168 per_cu->v.quick->mark = 1;
5172 for (int j = 0; j < file_data->num_file_names; ++j)
5174 const char *this_real_name;
5176 if (file_matcher (file_data->file_names[j], false))
5178 per_cu->v.quick->mark = 1;
5182 /* Before we invoke realpath, which can get expensive when many
5183 files are involved, do a quick comparison of the basenames. */
5184 if (!basenames_may_differ
5185 && !file_matcher (lbasename (file_data->file_names[j]),
5189 this_real_name = dw2_get_real_path (objfile, file_data, j);
5190 if (file_matcher (this_real_name, false))
5192 per_cu->v.quick->mark = 1;
5197 void **slot = htab_find_slot (per_cu->v.quick->mark
5198 ? visited_found.get ()
5199 : visited_not_found.get (),
5206 dw2_expand_symtabs_matching
5207 (struct objfile *objfile,
5208 gdb::function_view<expand_symtabs_file_matcher_ftype> file_matcher,
5209 const lookup_name_info &lookup_name,
5210 gdb::function_view<expand_symtabs_symbol_matcher_ftype> symbol_matcher,
5211 gdb::function_view<expand_symtabs_exp_notify_ftype> expansion_notify,
5212 enum search_domain kind)
5214 struct dwarf2_per_objfile *dwarf2_per_objfile
5215 = get_dwarf2_per_objfile (objfile);
5217 /* index_table is NULL if OBJF_READNOW. */
5218 if (!dwarf2_per_objfile->index_table)
5221 dw_expand_symtabs_matching_file_matcher (dwarf2_per_objfile, file_matcher);
5223 mapped_index &index = *dwarf2_per_objfile->index_table;
5225 dw2_expand_symtabs_matching_symbol (index, lookup_name,
5227 kind, [&] (offset_type idx)
5229 dw2_expand_marked_cus (dwarf2_per_objfile, idx, file_matcher,
5230 expansion_notify, kind);
5234 /* A helper for dw2_find_pc_sect_compunit_symtab which finds the most specific
5237 static struct compunit_symtab *
5238 recursively_find_pc_sect_compunit_symtab (struct compunit_symtab *cust,
5243 if (COMPUNIT_BLOCKVECTOR (cust) != NULL
5244 && blockvector_contains_pc (COMPUNIT_BLOCKVECTOR (cust), pc))
5247 if (cust->includes == NULL)
5250 for (i = 0; cust->includes[i]; ++i)
5252 struct compunit_symtab *s = cust->includes[i];
5254 s = recursively_find_pc_sect_compunit_symtab (s, pc);
5262 static struct compunit_symtab *
5263 dw2_find_pc_sect_compunit_symtab (struct objfile *objfile,
5264 struct bound_minimal_symbol msymbol,
5266 struct obj_section *section,
5269 struct dwarf2_per_cu_data *data;
5270 struct compunit_symtab *result;
5272 if (!objfile->partial_symtabs->psymtabs_addrmap)
5275 CORE_ADDR baseaddr = ANOFFSET (objfile->section_offsets,
5276 SECT_OFF_TEXT (objfile));
5277 data = (struct dwarf2_per_cu_data *) addrmap_find
5278 (objfile->partial_symtabs->psymtabs_addrmap, pc - baseaddr);
5282 if (warn_if_readin && data->v.quick->compunit_symtab)
5283 warning (_("(Internal error: pc %s in read in CU, but not in symtab.)"),
5284 paddress (get_objfile_arch (objfile), pc));
5287 = recursively_find_pc_sect_compunit_symtab (dw2_instantiate_symtab (data,
5290 gdb_assert (result != NULL);
5295 dw2_map_symbol_filenames (struct objfile *objfile, symbol_filename_ftype *fun,
5296 void *data, int need_fullname)
5298 struct dwarf2_per_objfile *dwarf2_per_objfile
5299 = get_dwarf2_per_objfile (objfile);
5301 if (!dwarf2_per_objfile->filenames_cache)
5303 dwarf2_per_objfile->filenames_cache.emplace ();
5305 htab_up visited (htab_create_alloc (10,
5306 htab_hash_pointer, htab_eq_pointer,
5307 NULL, xcalloc, xfree));
5309 /* The rule is CUs specify all the files, including those used
5310 by any TU, so there's no need to scan TUs here. We can
5311 ignore file names coming from already-expanded CUs. */
5313 for (dwarf2_per_cu_data *per_cu : dwarf2_per_objfile->all_comp_units)
5315 if (per_cu->v.quick->compunit_symtab)
5317 void **slot = htab_find_slot (visited.get (),
5318 per_cu->v.quick->file_names,
5321 *slot = per_cu->v.quick->file_names;
5325 for (dwarf2_per_cu_data *per_cu : dwarf2_per_objfile->all_comp_units)
5327 /* We only need to look at symtabs not already expanded. */
5328 if (per_cu->v.quick->compunit_symtab)
5331 quick_file_names *file_data = dw2_get_file_names (per_cu);
5332 if (file_data == NULL)
5335 void **slot = htab_find_slot (visited.get (), file_data, INSERT);
5338 /* Already visited. */
5343 for (int j = 0; j < file_data->num_file_names; ++j)
5345 const char *filename = file_data->file_names[j];
5346 dwarf2_per_objfile->filenames_cache->seen (filename);
5351 dwarf2_per_objfile->filenames_cache->traverse ([&] (const char *filename)
5353 gdb::unique_xmalloc_ptr<char> this_real_name;
5356 this_real_name = gdb_realpath (filename);
5357 (*fun) (filename, this_real_name.get (), data);
5362 dw2_has_symbols (struct objfile *objfile)
5367 const struct quick_symbol_functions dwarf2_gdb_index_functions =
5370 dw2_find_last_source_symtab,
5371 dw2_forget_cached_source_info,
5372 dw2_map_symtabs_matching_filename,
5376 dw2_expand_symtabs_for_function,
5377 dw2_expand_all_symtabs,
5378 dw2_expand_symtabs_with_fullname,
5379 dw2_map_matching_symbols,
5380 dw2_expand_symtabs_matching,
5381 dw2_find_pc_sect_compunit_symtab,
5383 dw2_map_symbol_filenames
5386 /* DWARF-5 debug_names reader. */
5388 /* DWARF-5 augmentation string for GDB's DW_IDX_GNU_* extension. */
5389 static const gdb_byte dwarf5_augmentation[] = { 'G', 'D', 'B', 0 };
5391 /* A helper function that reads the .debug_names section in SECTION
5392 and fills in MAP. FILENAME is the name of the file containing the
5393 section; it is used for error reporting.
5395 Returns true if all went well, false otherwise. */
5398 read_debug_names_from_section (struct objfile *objfile,
5399 const char *filename,
5400 struct dwarf2_section_info *section,
5401 mapped_debug_names &map)
5403 if (dwarf2_section_empty_p (section))
5406 /* Older elfutils strip versions could keep the section in the main
5407 executable while splitting it for the separate debug info file. */
5408 if ((get_section_flags (section) & SEC_HAS_CONTENTS) == 0)
5411 dwarf2_read_section (objfile, section);
5413 map.dwarf5_byte_order = gdbarch_byte_order (get_objfile_arch (objfile));
5415 const gdb_byte *addr = section->buffer;
5417 bfd *const abfd = get_section_bfd_owner (section);
5419 unsigned int bytes_read;
5420 LONGEST length = read_initial_length (abfd, addr, &bytes_read);
5423 map.dwarf5_is_dwarf64 = bytes_read != 4;
5424 map.offset_size = map.dwarf5_is_dwarf64 ? 8 : 4;
5425 if (bytes_read + length != section->size)
5427 /* There may be multiple per-CU indices. */
5428 warning (_("Section .debug_names in %s length %s does not match "
5429 "section length %s, ignoring .debug_names."),
5430 filename, plongest (bytes_read + length),
5431 pulongest (section->size));
5435 /* The version number. */
5436 uint16_t version = read_2_bytes (abfd, addr);
5440 warning (_("Section .debug_names in %s has unsupported version %d, "
5441 "ignoring .debug_names."),
5447 uint16_t padding = read_2_bytes (abfd, addr);
5451 warning (_("Section .debug_names in %s has unsupported padding %d, "
5452 "ignoring .debug_names."),
5457 /* comp_unit_count - The number of CUs in the CU list. */
5458 map.cu_count = read_4_bytes (abfd, addr);
5461 /* local_type_unit_count - The number of TUs in the local TU
5463 map.tu_count = read_4_bytes (abfd, addr);
5466 /* foreign_type_unit_count - The number of TUs in the foreign TU
5468 uint32_t foreign_tu_count = read_4_bytes (abfd, addr);
5470 if (foreign_tu_count != 0)
5472 warning (_("Section .debug_names in %s has unsupported %lu foreign TUs, "
5473 "ignoring .debug_names."),
5474 filename, static_cast<unsigned long> (foreign_tu_count));
5478 /* bucket_count - The number of hash buckets in the hash lookup
5480 map.bucket_count = read_4_bytes (abfd, addr);
5483 /* name_count - The number of unique names in the index. */
5484 map.name_count = read_4_bytes (abfd, addr);
5487 /* abbrev_table_size - The size in bytes of the abbreviations
5489 uint32_t abbrev_table_size = read_4_bytes (abfd, addr);
5492 /* augmentation_string_size - The size in bytes of the augmentation
5493 string. This value is rounded up to a multiple of 4. */
5494 uint32_t augmentation_string_size = read_4_bytes (abfd, addr);
5496 map.augmentation_is_gdb = ((augmentation_string_size
5497 == sizeof (dwarf5_augmentation))
5498 && memcmp (addr, dwarf5_augmentation,
5499 sizeof (dwarf5_augmentation)) == 0);
5500 augmentation_string_size += (-augmentation_string_size) & 3;
5501 addr += augmentation_string_size;
5504 map.cu_table_reordered = addr;
5505 addr += map.cu_count * map.offset_size;
5507 /* List of Local TUs */
5508 map.tu_table_reordered = addr;
5509 addr += map.tu_count * map.offset_size;
5511 /* Hash Lookup Table */
5512 map.bucket_table_reordered = reinterpret_cast<const uint32_t *> (addr);
5513 addr += map.bucket_count * 4;
5514 map.hash_table_reordered = reinterpret_cast<const uint32_t *> (addr);
5515 addr += map.name_count * 4;
5518 map.name_table_string_offs_reordered = addr;
5519 addr += map.name_count * map.offset_size;
5520 map.name_table_entry_offs_reordered = addr;
5521 addr += map.name_count * map.offset_size;
5523 const gdb_byte *abbrev_table_start = addr;
5526 const ULONGEST index_num = read_unsigned_leb128 (abfd, addr, &bytes_read);
5531 const auto insertpair
5532 = map.abbrev_map.emplace (index_num, mapped_debug_names::index_val ());
5533 if (!insertpair.second)
5535 warning (_("Section .debug_names in %s has duplicate index %s, "
5536 "ignoring .debug_names."),
5537 filename, pulongest (index_num));
5540 mapped_debug_names::index_val &indexval = insertpair.first->second;
5541 indexval.dwarf_tag = read_unsigned_leb128 (abfd, addr, &bytes_read);
5546 mapped_debug_names::index_val::attr attr;
5547 attr.dw_idx = read_unsigned_leb128 (abfd, addr, &bytes_read);
5549 attr.form = read_unsigned_leb128 (abfd, addr, &bytes_read);
5551 if (attr.form == DW_FORM_implicit_const)
5553 attr.implicit_const = read_signed_leb128 (abfd, addr,
5557 if (attr.dw_idx == 0 && attr.form == 0)
5559 indexval.attr_vec.push_back (std::move (attr));
5562 if (addr != abbrev_table_start + abbrev_table_size)
5564 warning (_("Section .debug_names in %s has abbreviation_table "
5565 "of size %zu vs. written as %u, ignoring .debug_names."),
5566 filename, addr - abbrev_table_start, abbrev_table_size);
5569 map.entry_pool = addr;
5574 /* A helper for create_cus_from_debug_names that handles the MAP's CU
5578 create_cus_from_debug_names_list (struct dwarf2_per_objfile *dwarf2_per_objfile,
5579 const mapped_debug_names &map,
5580 dwarf2_section_info §ion,
5583 sect_offset sect_off_prev;
5584 for (uint32_t i = 0; i <= map.cu_count; ++i)
5586 sect_offset sect_off_next;
5587 if (i < map.cu_count)
5590 = (sect_offset) (extract_unsigned_integer
5591 (map.cu_table_reordered + i * map.offset_size,
5593 map.dwarf5_byte_order));
5596 sect_off_next = (sect_offset) section.size;
5599 const ULONGEST length = sect_off_next - sect_off_prev;
5600 dwarf2_per_cu_data *per_cu
5601 = create_cu_from_index_list (dwarf2_per_objfile, §ion, is_dwz,
5602 sect_off_prev, length);
5603 dwarf2_per_objfile->all_comp_units.push_back (per_cu);
5605 sect_off_prev = sect_off_next;
5609 /* Read the CU list from the mapped index, and use it to create all
5610 the CU objects for this dwarf2_per_objfile. */
5613 create_cus_from_debug_names (struct dwarf2_per_objfile *dwarf2_per_objfile,
5614 const mapped_debug_names &map,
5615 const mapped_debug_names &dwz_map)
5617 gdb_assert (dwarf2_per_objfile->all_comp_units.empty ());
5618 dwarf2_per_objfile->all_comp_units.reserve (map.cu_count + dwz_map.cu_count);
5620 create_cus_from_debug_names_list (dwarf2_per_objfile, map,
5621 dwarf2_per_objfile->info,
5622 false /* is_dwz */);
5624 if (dwz_map.cu_count == 0)
5627 dwz_file *dwz = dwarf2_get_dwz_file (dwarf2_per_objfile);
5628 create_cus_from_debug_names_list (dwarf2_per_objfile, dwz_map, dwz->info,
5632 /* Read .debug_names. If everything went ok, initialize the "quick"
5633 elements of all the CUs and return true. Otherwise, return false. */
5636 dwarf2_read_debug_names (struct dwarf2_per_objfile *dwarf2_per_objfile)
5638 std::unique_ptr<mapped_debug_names> map
5639 (new mapped_debug_names (dwarf2_per_objfile));
5640 mapped_debug_names dwz_map (dwarf2_per_objfile);
5641 struct objfile *objfile = dwarf2_per_objfile->objfile;
5643 if (!read_debug_names_from_section (objfile, objfile_name (objfile),
5644 &dwarf2_per_objfile->debug_names,
5648 /* Don't use the index if it's empty. */
5649 if (map->name_count == 0)
5652 /* If there is a .dwz file, read it so we can get its CU list as
5654 dwz_file *dwz = dwarf2_get_dwz_file (dwarf2_per_objfile);
5657 if (!read_debug_names_from_section (objfile,
5658 bfd_get_filename (dwz->dwz_bfd),
5659 &dwz->debug_names, dwz_map))
5661 warning (_("could not read '.debug_names' section from %s; skipping"),
5662 bfd_get_filename (dwz->dwz_bfd));
5667 create_cus_from_debug_names (dwarf2_per_objfile, *map, dwz_map);
5669 if (map->tu_count != 0)
5671 /* We can only handle a single .debug_types when we have an
5673 if (VEC_length (dwarf2_section_info_def, dwarf2_per_objfile->types) != 1)
5676 dwarf2_section_info *section = VEC_index (dwarf2_section_info_def,
5677 dwarf2_per_objfile->types, 0);
5679 create_signatured_type_table_from_debug_names
5680 (dwarf2_per_objfile, *map, section, &dwarf2_per_objfile->abbrev);
5683 create_addrmap_from_aranges (dwarf2_per_objfile,
5684 &dwarf2_per_objfile->debug_aranges);
5686 dwarf2_per_objfile->debug_names_table = std::move (map);
5687 dwarf2_per_objfile->using_index = 1;
5688 dwarf2_per_objfile->quick_file_names_table =
5689 create_quick_file_names_table (dwarf2_per_objfile->all_comp_units.size ());
5694 /* Type used to manage iterating over all CUs looking for a symbol for
5697 class dw2_debug_names_iterator
5700 /* If WANT_SPECIFIC_BLOCK is true, only look for symbols in block
5701 BLOCK_INDEX. Otherwise BLOCK_INDEX is ignored. */
5702 dw2_debug_names_iterator (const mapped_debug_names &map,
5703 bool want_specific_block,
5704 block_enum block_index, domain_enum domain,
5706 : m_map (map), m_want_specific_block (want_specific_block),
5707 m_block_index (block_index), m_domain (domain),
5708 m_addr (find_vec_in_debug_names (map, name))
5711 dw2_debug_names_iterator (const mapped_debug_names &map,
5712 search_domain search, uint32_t namei)
5715 m_addr (find_vec_in_debug_names (map, namei))
5718 /* Return the next matching CU or NULL if there are no more. */
5719 dwarf2_per_cu_data *next ();
5722 static const gdb_byte *find_vec_in_debug_names (const mapped_debug_names &map,
5724 static const gdb_byte *find_vec_in_debug_names (const mapped_debug_names &map,
5727 /* The internalized form of .debug_names. */
5728 const mapped_debug_names &m_map;
5730 /* If true, only look for symbols that match BLOCK_INDEX. */
5731 const bool m_want_specific_block = false;
5733 /* One of GLOBAL_BLOCK or STATIC_BLOCK.
5734 Unused if !WANT_SPECIFIC_BLOCK - FIRST_LOCAL_BLOCK is an invalid
5736 const block_enum m_block_index = FIRST_LOCAL_BLOCK;
5738 /* The kind of symbol we're looking for. */
5739 const domain_enum m_domain = UNDEF_DOMAIN;
5740 const search_domain m_search = ALL_DOMAIN;
5742 /* The list of CUs from the index entry of the symbol, or NULL if
5744 const gdb_byte *m_addr;
5748 mapped_debug_names::namei_to_name (uint32_t namei) const
5750 const ULONGEST namei_string_offs
5751 = extract_unsigned_integer ((name_table_string_offs_reordered
5752 + namei * offset_size),
5755 return read_indirect_string_at_offset
5756 (dwarf2_per_objfile, dwarf2_per_objfile->objfile->obfd, namei_string_offs);
5759 /* Find a slot in .debug_names for the object named NAME. If NAME is
5760 found, return pointer to its pool data. If NAME cannot be found,
5764 dw2_debug_names_iterator::find_vec_in_debug_names
5765 (const mapped_debug_names &map, const char *name)
5767 int (*cmp) (const char *, const char *);
5769 if (current_language->la_language == language_cplus
5770 || current_language->la_language == language_fortran
5771 || current_language->la_language == language_d)
5773 /* NAME is already canonical. Drop any qualifiers as
5774 .debug_names does not contain any. */
5776 if (strchr (name, '(') != NULL)
5778 gdb::unique_xmalloc_ptr<char> without_params
5779 = cp_remove_params (name);
5781 if (without_params != NULL)
5783 name = without_params.get();
5788 cmp = (case_sensitivity == case_sensitive_on ? strcmp : strcasecmp);
5790 const uint32_t full_hash = dwarf5_djb_hash (name);
5792 = extract_unsigned_integer (reinterpret_cast<const gdb_byte *>
5793 (map.bucket_table_reordered
5794 + (full_hash % map.bucket_count)), 4,
5795 map.dwarf5_byte_order);
5799 if (namei >= map.name_count)
5801 complaint (_("Wrong .debug_names with name index %u but name_count=%u "
5803 namei, map.name_count,
5804 objfile_name (map.dwarf2_per_objfile->objfile));
5810 const uint32_t namei_full_hash
5811 = extract_unsigned_integer (reinterpret_cast<const gdb_byte *>
5812 (map.hash_table_reordered + namei), 4,
5813 map.dwarf5_byte_order);
5814 if (full_hash % map.bucket_count != namei_full_hash % map.bucket_count)
5817 if (full_hash == namei_full_hash)
5819 const char *const namei_string = map.namei_to_name (namei);
5821 #if 0 /* An expensive sanity check. */
5822 if (namei_full_hash != dwarf5_djb_hash (namei_string))
5824 complaint (_("Wrong .debug_names hash for string at index %u "
5826 namei, objfile_name (dwarf2_per_objfile->objfile));
5831 if (cmp (namei_string, name) == 0)
5833 const ULONGEST namei_entry_offs
5834 = extract_unsigned_integer ((map.name_table_entry_offs_reordered
5835 + namei * map.offset_size),
5836 map.offset_size, map.dwarf5_byte_order);
5837 return map.entry_pool + namei_entry_offs;
5842 if (namei >= map.name_count)
5848 dw2_debug_names_iterator::find_vec_in_debug_names
5849 (const mapped_debug_names &map, uint32_t namei)
5851 if (namei >= map.name_count)
5853 complaint (_("Wrong .debug_names with name index %u but name_count=%u "
5855 namei, map.name_count,
5856 objfile_name (map.dwarf2_per_objfile->objfile));
5860 const ULONGEST namei_entry_offs
5861 = extract_unsigned_integer ((map.name_table_entry_offs_reordered
5862 + namei * map.offset_size),
5863 map.offset_size, map.dwarf5_byte_order);
5864 return map.entry_pool + namei_entry_offs;
5867 /* See dw2_debug_names_iterator. */
5869 dwarf2_per_cu_data *
5870 dw2_debug_names_iterator::next ()
5875 struct dwarf2_per_objfile *dwarf2_per_objfile = m_map.dwarf2_per_objfile;
5876 struct objfile *objfile = dwarf2_per_objfile->objfile;
5877 bfd *const abfd = objfile->obfd;
5881 unsigned int bytes_read;
5882 const ULONGEST abbrev = read_unsigned_leb128 (abfd, m_addr, &bytes_read);
5883 m_addr += bytes_read;
5887 const auto indexval_it = m_map.abbrev_map.find (abbrev);
5888 if (indexval_it == m_map.abbrev_map.cend ())
5890 complaint (_("Wrong .debug_names undefined abbrev code %s "
5892 pulongest (abbrev), objfile_name (objfile));
5895 const mapped_debug_names::index_val &indexval = indexval_it->second;
5896 bool have_is_static = false;
5898 dwarf2_per_cu_data *per_cu = NULL;
5899 for (const mapped_debug_names::index_val::attr &attr : indexval.attr_vec)
5904 case DW_FORM_implicit_const:
5905 ull = attr.implicit_const;
5907 case DW_FORM_flag_present:
5911 ull = read_unsigned_leb128 (abfd, m_addr, &bytes_read);
5912 m_addr += bytes_read;
5915 complaint (_("Unsupported .debug_names form %s [in module %s]"),
5916 dwarf_form_name (attr.form),
5917 objfile_name (objfile));
5920 switch (attr.dw_idx)
5922 case DW_IDX_compile_unit:
5923 /* Don't crash on bad data. */
5924 if (ull >= dwarf2_per_objfile->all_comp_units.size ())
5926 complaint (_(".debug_names entry has bad CU index %s"
5929 objfile_name (dwarf2_per_objfile->objfile));
5932 per_cu = dwarf2_per_objfile->get_cutu (ull);
5934 case DW_IDX_type_unit:
5935 /* Don't crash on bad data. */
5936 if (ull >= dwarf2_per_objfile->all_type_units.size ())
5938 complaint (_(".debug_names entry has bad TU index %s"
5941 objfile_name (dwarf2_per_objfile->objfile));
5944 per_cu = &dwarf2_per_objfile->get_tu (ull)->per_cu;
5946 case DW_IDX_GNU_internal:
5947 if (!m_map.augmentation_is_gdb)
5949 have_is_static = true;
5952 case DW_IDX_GNU_external:
5953 if (!m_map.augmentation_is_gdb)
5955 have_is_static = true;
5961 /* Skip if already read in. */
5962 if (per_cu->v.quick->compunit_symtab)
5965 /* Check static vs global. */
5968 const bool want_static = m_block_index != GLOBAL_BLOCK;
5969 if (m_want_specific_block && want_static != is_static)
5973 /* Match dw2_symtab_iter_next, symbol_kind
5974 and debug_names::psymbol_tag. */
5978 switch (indexval.dwarf_tag)
5980 case DW_TAG_variable:
5981 case DW_TAG_subprogram:
5982 /* Some types are also in VAR_DOMAIN. */
5983 case DW_TAG_typedef:
5984 case DW_TAG_structure_type:
5991 switch (indexval.dwarf_tag)
5993 case DW_TAG_typedef:
5994 case DW_TAG_structure_type:
6001 switch (indexval.dwarf_tag)
6004 case DW_TAG_variable:
6014 /* Match dw2_expand_symtabs_matching, symbol_kind and
6015 debug_names::psymbol_tag. */
6018 case VARIABLES_DOMAIN:
6019 switch (indexval.dwarf_tag)
6021 case DW_TAG_variable:
6027 case FUNCTIONS_DOMAIN:
6028 switch (indexval.dwarf_tag)
6030 case DW_TAG_subprogram:
6037 switch (indexval.dwarf_tag)
6039 case DW_TAG_typedef:
6040 case DW_TAG_structure_type:
6053 static struct compunit_symtab *
6054 dw2_debug_names_lookup_symbol (struct objfile *objfile, int block_index_int,
6055 const char *name, domain_enum domain)
6057 const block_enum block_index = static_cast<block_enum> (block_index_int);
6058 struct dwarf2_per_objfile *dwarf2_per_objfile
6059 = get_dwarf2_per_objfile (objfile);
6061 const auto &mapp = dwarf2_per_objfile->debug_names_table;
6064 /* index is NULL if OBJF_READNOW. */
6067 const auto &map = *mapp;
6069 dw2_debug_names_iterator iter (map, true /* want_specific_block */,
6070 block_index, domain, name);
6072 struct compunit_symtab *stab_best = NULL;
6073 struct dwarf2_per_cu_data *per_cu;
6074 while ((per_cu = iter.next ()) != NULL)
6076 struct symbol *sym, *with_opaque = NULL;
6077 struct compunit_symtab *stab = dw2_instantiate_symtab (per_cu, false);
6078 const struct blockvector *bv = COMPUNIT_BLOCKVECTOR (stab);
6079 const struct block *block = BLOCKVECTOR_BLOCK (bv, block_index);
6081 sym = block_find_symbol (block, name, domain,
6082 block_find_non_opaque_type_preferred,
6085 /* Some caution must be observed with overloaded functions and
6086 methods, since the index will not contain any overload
6087 information (but NAME might contain it). */
6090 && strcmp_iw (SYMBOL_SEARCH_NAME (sym), name) == 0)
6092 if (with_opaque != NULL
6093 && strcmp_iw (SYMBOL_SEARCH_NAME (with_opaque), name) == 0)
6096 /* Keep looking through other CUs. */
6102 /* This dumps minimal information about .debug_names. It is called
6103 via "mt print objfiles". The gdb.dwarf2/gdb-index.exp testcase
6104 uses this to verify that .debug_names has been loaded. */
6107 dw2_debug_names_dump (struct objfile *objfile)
6109 struct dwarf2_per_objfile *dwarf2_per_objfile
6110 = get_dwarf2_per_objfile (objfile);
6112 gdb_assert (dwarf2_per_objfile->using_index);
6113 printf_filtered (".debug_names:");
6114 if (dwarf2_per_objfile->debug_names_table)
6115 printf_filtered (" exists\n");
6117 printf_filtered (" faked for \"readnow\"\n");
6118 printf_filtered ("\n");
6122 dw2_debug_names_expand_symtabs_for_function (struct objfile *objfile,
6123 const char *func_name)
6125 struct dwarf2_per_objfile *dwarf2_per_objfile
6126 = get_dwarf2_per_objfile (objfile);
6128 /* dwarf2_per_objfile->debug_names_table is NULL if OBJF_READNOW. */
6129 if (dwarf2_per_objfile->debug_names_table)
6131 const mapped_debug_names &map = *dwarf2_per_objfile->debug_names_table;
6133 /* Note: It doesn't matter what we pass for block_index here. */
6134 dw2_debug_names_iterator iter (map, false /* want_specific_block */,
6135 GLOBAL_BLOCK, VAR_DOMAIN, func_name);
6137 struct dwarf2_per_cu_data *per_cu;
6138 while ((per_cu = iter.next ()) != NULL)
6139 dw2_instantiate_symtab (per_cu, false);
6144 dw2_debug_names_expand_symtabs_matching
6145 (struct objfile *objfile,
6146 gdb::function_view<expand_symtabs_file_matcher_ftype> file_matcher,
6147 const lookup_name_info &lookup_name,
6148 gdb::function_view<expand_symtabs_symbol_matcher_ftype> symbol_matcher,
6149 gdb::function_view<expand_symtabs_exp_notify_ftype> expansion_notify,
6150 enum search_domain kind)
6152 struct dwarf2_per_objfile *dwarf2_per_objfile
6153 = get_dwarf2_per_objfile (objfile);
6155 /* debug_names_table is NULL if OBJF_READNOW. */
6156 if (!dwarf2_per_objfile->debug_names_table)
6159 dw_expand_symtabs_matching_file_matcher (dwarf2_per_objfile, file_matcher);
6161 mapped_debug_names &map = *dwarf2_per_objfile->debug_names_table;
6163 dw2_expand_symtabs_matching_symbol (map, lookup_name,
6165 kind, [&] (offset_type namei)
6167 /* The name was matched, now expand corresponding CUs that were
6169 dw2_debug_names_iterator iter (map, kind, namei);
6171 struct dwarf2_per_cu_data *per_cu;
6172 while ((per_cu = iter.next ()) != NULL)
6173 dw2_expand_symtabs_matching_one (per_cu, file_matcher,
6178 const struct quick_symbol_functions dwarf2_debug_names_functions =
6181 dw2_find_last_source_symtab,
6182 dw2_forget_cached_source_info,
6183 dw2_map_symtabs_matching_filename,
6184 dw2_debug_names_lookup_symbol,
6186 dw2_debug_names_dump,
6187 dw2_debug_names_expand_symtabs_for_function,
6188 dw2_expand_all_symtabs,
6189 dw2_expand_symtabs_with_fullname,
6190 dw2_map_matching_symbols,
6191 dw2_debug_names_expand_symtabs_matching,
6192 dw2_find_pc_sect_compunit_symtab,
6194 dw2_map_symbol_filenames
6197 /* Get the content of the .gdb_index section of OBJ. SECTION_OWNER should point
6198 to either a dwarf2_per_objfile or dwz_file object. */
6200 template <typename T>
6201 static gdb::array_view<const gdb_byte>
6202 get_gdb_index_contents_from_section (objfile *obj, T *section_owner)
6204 dwarf2_section_info *section = §ion_owner->gdb_index;
6206 if (dwarf2_section_empty_p (section))
6209 /* Older elfutils strip versions could keep the section in the main
6210 executable while splitting it for the separate debug info file. */
6211 if ((get_section_flags (section) & SEC_HAS_CONTENTS) == 0)
6214 dwarf2_read_section (obj, section);
6216 /* dwarf2_section_info::size is a bfd_size_type, while
6217 gdb::array_view works with size_t. On 32-bit hosts, with
6218 --enable-64-bit-bfd, bfd_size_type is a 64-bit type, while size_t
6219 is 32-bit. So we need an explicit narrowing conversion here.
6220 This is fine, because it's impossible to allocate or mmap an
6221 array/buffer larger than what size_t can represent. */
6222 return gdb::make_array_view (section->buffer, section->size);
6225 /* Lookup the index cache for the contents of the index associated to
6228 static gdb::array_view<const gdb_byte>
6229 get_gdb_index_contents_from_cache (objfile *obj, dwarf2_per_objfile *dwarf2_obj)
6231 const bfd_build_id *build_id = build_id_bfd_get (obj->obfd);
6232 if (build_id == nullptr)
6235 return global_index_cache.lookup_gdb_index (build_id,
6236 &dwarf2_obj->index_cache_res);
6239 /* Same as the above, but for DWZ. */
6241 static gdb::array_view<const gdb_byte>
6242 get_gdb_index_contents_from_cache_dwz (objfile *obj, dwz_file *dwz)
6244 const bfd_build_id *build_id = build_id_bfd_get (dwz->dwz_bfd.get ());
6245 if (build_id == nullptr)
6248 return global_index_cache.lookup_gdb_index (build_id, &dwz->index_cache_res);
6251 /* See symfile.h. */
6254 dwarf2_initialize_objfile (struct objfile *objfile, dw_index_kind *index_kind)
6256 struct dwarf2_per_objfile *dwarf2_per_objfile
6257 = get_dwarf2_per_objfile (objfile);
6259 /* If we're about to read full symbols, don't bother with the
6260 indices. In this case we also don't care if some other debug
6261 format is making psymtabs, because they are all about to be
6263 if ((objfile->flags & OBJF_READNOW))
6265 dwarf2_per_objfile->using_index = 1;
6266 create_all_comp_units (dwarf2_per_objfile);
6267 create_all_type_units (dwarf2_per_objfile);
6268 dwarf2_per_objfile->quick_file_names_table
6269 = create_quick_file_names_table
6270 (dwarf2_per_objfile->all_comp_units.size ());
6272 for (int i = 0; i < (dwarf2_per_objfile->all_comp_units.size ()
6273 + dwarf2_per_objfile->all_type_units.size ()); ++i)
6275 dwarf2_per_cu_data *per_cu = dwarf2_per_objfile->get_cutu (i);
6277 per_cu->v.quick = OBSTACK_ZALLOC (&objfile->objfile_obstack,
6278 struct dwarf2_per_cu_quick_data);
6281 /* Return 1 so that gdb sees the "quick" functions. However,
6282 these functions will be no-ops because we will have expanded
6284 *index_kind = dw_index_kind::GDB_INDEX;
6288 if (dwarf2_read_debug_names (dwarf2_per_objfile))
6290 *index_kind = dw_index_kind::DEBUG_NAMES;
6294 if (dwarf2_read_gdb_index (dwarf2_per_objfile,
6295 get_gdb_index_contents_from_section<struct dwarf2_per_objfile>,
6296 get_gdb_index_contents_from_section<dwz_file>))
6298 *index_kind = dw_index_kind::GDB_INDEX;
6302 /* ... otherwise, try to find the index in the index cache. */
6303 if (dwarf2_read_gdb_index (dwarf2_per_objfile,
6304 get_gdb_index_contents_from_cache,
6305 get_gdb_index_contents_from_cache_dwz))
6307 global_index_cache.hit ();
6308 *index_kind = dw_index_kind::GDB_INDEX;
6312 global_index_cache.miss ();
6318 /* Build a partial symbol table. */
6321 dwarf2_build_psymtabs (struct objfile *objfile)
6323 struct dwarf2_per_objfile *dwarf2_per_objfile
6324 = get_dwarf2_per_objfile (objfile);
6326 init_psymbol_list (objfile, 1024);
6330 /* This isn't really ideal: all the data we allocate on the
6331 objfile's obstack is still uselessly kept around. However,
6332 freeing it seems unsafe. */
6333 psymtab_discarder psymtabs (objfile);
6334 dwarf2_build_psymtabs_hard (dwarf2_per_objfile);
6337 /* (maybe) store an index in the cache. */
6338 global_index_cache.store (dwarf2_per_objfile);
6340 catch (const gdb_exception_error &except)
6342 exception_print (gdb_stderr, except);
6346 /* Return the total length of the CU described by HEADER. */
6349 get_cu_length (const struct comp_unit_head *header)
6351 return header->initial_length_size + header->length;
6354 /* Return TRUE if SECT_OFF is within CU_HEADER. */
6357 offset_in_cu_p (const comp_unit_head *cu_header, sect_offset sect_off)
6359 sect_offset bottom = cu_header->sect_off;
6360 sect_offset top = cu_header->sect_off + get_cu_length (cu_header);
6362 return sect_off >= bottom && sect_off < top;
6365 /* Find the base address of the compilation unit for range lists and
6366 location lists. It will normally be specified by DW_AT_low_pc.
6367 In DWARF-3 draft 4, the base address could be overridden by
6368 DW_AT_entry_pc. It's been removed, but GCC still uses this for
6369 compilation units with discontinuous ranges. */
6372 dwarf2_find_base_address (struct die_info *die, struct dwarf2_cu *cu)
6374 struct attribute *attr;
6377 cu->base_address = 0;
6379 attr = dwarf2_attr (die, DW_AT_entry_pc, cu);
6382 cu->base_address = attr_value_as_address (attr);
6387 attr = dwarf2_attr (die, DW_AT_low_pc, cu);
6390 cu->base_address = attr_value_as_address (attr);
6396 /* Read in the comp unit header information from the debug_info at info_ptr.
6397 Use rcuh_kind::COMPILE as the default type if not known by the caller.
6398 NOTE: This leaves members offset, first_die_offset to be filled in
6401 static const gdb_byte *
6402 read_comp_unit_head (struct comp_unit_head *cu_header,
6403 const gdb_byte *info_ptr,
6404 struct dwarf2_section_info *section,
6405 rcuh_kind section_kind)
6408 unsigned int bytes_read;
6409 const char *filename = get_section_file_name (section);
6410 bfd *abfd = get_section_bfd_owner (section);
6412 cu_header->length = read_initial_length (abfd, info_ptr, &bytes_read);
6413 cu_header->initial_length_size = bytes_read;
6414 cu_header->offset_size = (bytes_read == 4) ? 4 : 8;
6415 info_ptr += bytes_read;
6416 cu_header->version = read_2_bytes (abfd, info_ptr);
6417 if (cu_header->version < 2 || cu_header->version > 5)
6418 error (_("Dwarf Error: wrong version in compilation unit header "
6419 "(is %d, should be 2, 3, 4 or 5) [in module %s]"),
6420 cu_header->version, filename);
6422 if (cu_header->version < 5)
6423 switch (section_kind)
6425 case rcuh_kind::COMPILE:
6426 cu_header->unit_type = DW_UT_compile;
6428 case rcuh_kind::TYPE:
6429 cu_header->unit_type = DW_UT_type;
6432 internal_error (__FILE__, __LINE__,
6433 _("read_comp_unit_head: invalid section_kind"));
6437 cu_header->unit_type = static_cast<enum dwarf_unit_type>
6438 (read_1_byte (abfd, info_ptr));
6440 switch (cu_header->unit_type)
6443 if (section_kind != rcuh_kind::COMPILE)
6444 error (_("Dwarf Error: wrong unit_type in compilation unit header "
6445 "(is DW_UT_compile, should be DW_UT_type) [in module %s]"),
6449 section_kind = rcuh_kind::TYPE;
6452 error (_("Dwarf Error: wrong unit_type in compilation unit header "
6453 "(is %d, should be %d or %d) [in module %s]"),
6454 cu_header->unit_type, DW_UT_compile, DW_UT_type, filename);
6457 cu_header->addr_size = read_1_byte (abfd, info_ptr);
6460 cu_header->abbrev_sect_off = (sect_offset) read_offset (abfd, info_ptr,
6463 info_ptr += bytes_read;
6464 if (cu_header->version < 5)
6466 cu_header->addr_size = read_1_byte (abfd, info_ptr);
6469 signed_addr = bfd_get_sign_extend_vma (abfd);
6470 if (signed_addr < 0)
6471 internal_error (__FILE__, __LINE__,
6472 _("read_comp_unit_head: dwarf from non elf file"));
6473 cu_header->signed_addr_p = signed_addr;
6475 if (section_kind == rcuh_kind::TYPE)
6477 LONGEST type_offset;
6479 cu_header->signature = read_8_bytes (abfd, info_ptr);
6482 type_offset = read_offset (abfd, info_ptr, cu_header, &bytes_read);
6483 info_ptr += bytes_read;
6484 cu_header->type_cu_offset_in_tu = (cu_offset) type_offset;
6485 if (to_underlying (cu_header->type_cu_offset_in_tu) != type_offset)
6486 error (_("Dwarf Error: Too big type_offset in compilation unit "
6487 "header (is %s) [in module %s]"), plongest (type_offset),
6494 /* Helper function that returns the proper abbrev section for
6497 static struct dwarf2_section_info *
6498 get_abbrev_section_for_cu (struct dwarf2_per_cu_data *this_cu)
6500 struct dwarf2_section_info *abbrev;
6501 struct dwarf2_per_objfile *dwarf2_per_objfile = this_cu->dwarf2_per_objfile;
6503 if (this_cu->is_dwz)
6504 abbrev = &dwarf2_get_dwz_file (dwarf2_per_objfile)->abbrev;
6506 abbrev = &dwarf2_per_objfile->abbrev;
6511 /* Subroutine of read_and_check_comp_unit_head and
6512 read_and_check_type_unit_head to simplify them.
6513 Perform various error checking on the header. */
6516 error_check_comp_unit_head (struct dwarf2_per_objfile *dwarf2_per_objfile,
6517 struct comp_unit_head *header,
6518 struct dwarf2_section_info *section,
6519 struct dwarf2_section_info *abbrev_section)
6521 const char *filename = get_section_file_name (section);
6523 if (to_underlying (header->abbrev_sect_off)
6524 >= dwarf2_section_size (dwarf2_per_objfile->objfile, abbrev_section))
6525 error (_("Dwarf Error: bad offset (%s) in compilation unit header "
6526 "(offset %s + 6) [in module %s]"),
6527 sect_offset_str (header->abbrev_sect_off),
6528 sect_offset_str (header->sect_off),
6531 /* Cast to ULONGEST to use 64-bit arithmetic when possible to
6532 avoid potential 32-bit overflow. */
6533 if (((ULONGEST) header->sect_off + get_cu_length (header))
6535 error (_("Dwarf Error: bad length (0x%x) in compilation unit header "
6536 "(offset %s + 0) [in module %s]"),
6537 header->length, sect_offset_str (header->sect_off),
6541 /* Read in a CU/TU header and perform some basic error checking.
6542 The contents of the header are stored in HEADER.
6543 The result is a pointer to the start of the first DIE. */
6545 static const gdb_byte *
6546 read_and_check_comp_unit_head (struct dwarf2_per_objfile *dwarf2_per_objfile,
6547 struct comp_unit_head *header,
6548 struct dwarf2_section_info *section,
6549 struct dwarf2_section_info *abbrev_section,
6550 const gdb_byte *info_ptr,
6551 rcuh_kind section_kind)
6553 const gdb_byte *beg_of_comp_unit = info_ptr;
6555 header->sect_off = (sect_offset) (beg_of_comp_unit - section->buffer);
6557 info_ptr = read_comp_unit_head (header, info_ptr, section, section_kind);
6559 header->first_die_cu_offset = (cu_offset) (info_ptr - beg_of_comp_unit);
6561 error_check_comp_unit_head (dwarf2_per_objfile, header, section,
6567 /* Fetch the abbreviation table offset from a comp or type unit header. */
6570 read_abbrev_offset (struct dwarf2_per_objfile *dwarf2_per_objfile,
6571 struct dwarf2_section_info *section,
6572 sect_offset sect_off)
6574 bfd *abfd = get_section_bfd_owner (section);
6575 const gdb_byte *info_ptr;
6576 unsigned int initial_length_size, offset_size;
6579 dwarf2_read_section (dwarf2_per_objfile->objfile, section);
6580 info_ptr = section->buffer + to_underlying (sect_off);
6581 read_initial_length (abfd, info_ptr, &initial_length_size);
6582 offset_size = initial_length_size == 4 ? 4 : 8;
6583 info_ptr += initial_length_size;
6585 version = read_2_bytes (abfd, info_ptr);
6589 /* Skip unit type and address size. */
6593 return (sect_offset) read_offset_1 (abfd, info_ptr, offset_size);
6596 /* Allocate a new partial symtab for file named NAME and mark this new
6597 partial symtab as being an include of PST. */
6600 dwarf2_create_include_psymtab (const char *name, struct partial_symtab *pst,
6601 struct objfile *objfile)
6603 struct partial_symtab *subpst = allocate_psymtab (name, objfile);
6605 if (!IS_ABSOLUTE_PATH (subpst->filename))
6607 /* It shares objfile->objfile_obstack. */
6608 subpst->dirname = pst->dirname;
6611 subpst->dependencies = objfile->partial_symtabs->allocate_dependencies (1);
6612 subpst->dependencies[0] = pst;
6613 subpst->number_of_dependencies = 1;
6615 subpst->read_symtab = pst->read_symtab;
6617 /* No private part is necessary for include psymtabs. This property
6618 can be used to differentiate between such include psymtabs and
6619 the regular ones. */
6620 subpst->read_symtab_private = NULL;
6623 /* Read the Line Number Program data and extract the list of files
6624 included by the source file represented by PST. Build an include
6625 partial symtab for each of these included files. */
6628 dwarf2_build_include_psymtabs (struct dwarf2_cu *cu,
6629 struct die_info *die,
6630 struct partial_symtab *pst)
6633 struct attribute *attr;
6635 attr = dwarf2_attr (die, DW_AT_stmt_list, cu);
6637 lh = dwarf_decode_line_header ((sect_offset) DW_UNSND (attr), cu);
6639 return; /* No linetable, so no includes. */
6641 /* NOTE: pst->dirname is DW_AT_comp_dir (if present). Also note
6642 that we pass in the raw text_low here; that is ok because we're
6643 only decoding the line table to make include partial symtabs, and
6644 so the addresses aren't really used. */
6645 dwarf_decode_lines (lh.get (), pst->dirname, cu, pst,
6646 pst->raw_text_low (), 1);
6650 hash_signatured_type (const void *item)
6652 const struct signatured_type *sig_type
6653 = (const struct signatured_type *) item;
6655 /* This drops the top 32 bits of the signature, but is ok for a hash. */
6656 return sig_type->signature;
6660 eq_signatured_type (const void *item_lhs, const void *item_rhs)
6662 const struct signatured_type *lhs = (const struct signatured_type *) item_lhs;
6663 const struct signatured_type *rhs = (const struct signatured_type *) item_rhs;
6665 return lhs->signature == rhs->signature;
6668 /* Allocate a hash table for signatured types. */
6671 allocate_signatured_type_table (struct objfile *objfile)
6673 return htab_create_alloc_ex (41,
6674 hash_signatured_type,
6677 &objfile->objfile_obstack,
6678 hashtab_obstack_allocate,
6679 dummy_obstack_deallocate);
6682 /* A helper function to add a signatured type CU to a table. */
6685 add_signatured_type_cu_to_table (void **slot, void *datum)
6687 struct signatured_type *sigt = (struct signatured_type *) *slot;
6688 std::vector<signatured_type *> *all_type_units
6689 = (std::vector<signatured_type *> *) datum;
6691 all_type_units->push_back (sigt);
6696 /* A helper for create_debug_types_hash_table. Read types from SECTION
6697 and fill them into TYPES_HTAB. It will process only type units,
6698 therefore DW_UT_type. */
6701 create_debug_type_hash_table (struct dwarf2_per_objfile *dwarf2_per_objfile,
6702 struct dwo_file *dwo_file,
6703 dwarf2_section_info *section, htab_t &types_htab,
6704 rcuh_kind section_kind)
6706 struct objfile *objfile = dwarf2_per_objfile->objfile;
6707 struct dwarf2_section_info *abbrev_section;
6709 const gdb_byte *info_ptr, *end_ptr;
6711 abbrev_section = (dwo_file != NULL
6712 ? &dwo_file->sections.abbrev
6713 : &dwarf2_per_objfile->abbrev);
6715 if (dwarf_read_debug)
6716 fprintf_unfiltered (gdb_stdlog, "Reading %s for %s:\n",
6717 get_section_name (section),
6718 get_section_file_name (abbrev_section));
6720 dwarf2_read_section (objfile, section);
6721 info_ptr = section->buffer;
6723 if (info_ptr == NULL)
6726 /* We can't set abfd until now because the section may be empty or
6727 not present, in which case the bfd is unknown. */
6728 abfd = get_section_bfd_owner (section);
6730 /* We don't use init_cutu_and_read_dies_simple, or some such, here
6731 because we don't need to read any dies: the signature is in the
6734 end_ptr = info_ptr + section->size;
6735 while (info_ptr < end_ptr)
6737 struct signatured_type *sig_type;
6738 struct dwo_unit *dwo_tu;
6740 const gdb_byte *ptr = info_ptr;
6741 struct comp_unit_head header;
6742 unsigned int length;
6744 sect_offset sect_off = (sect_offset) (ptr - section->buffer);
6746 /* Initialize it due to a false compiler warning. */
6747 header.signature = -1;
6748 header.type_cu_offset_in_tu = (cu_offset) -1;
6750 /* We need to read the type's signature in order to build the hash
6751 table, but we don't need anything else just yet. */
6753 ptr = read_and_check_comp_unit_head (dwarf2_per_objfile, &header, section,
6754 abbrev_section, ptr, section_kind);
6756 length = get_cu_length (&header);
6758 /* Skip dummy type units. */
6759 if (ptr >= info_ptr + length
6760 || peek_abbrev_code (abfd, ptr) == 0
6761 || header.unit_type != DW_UT_type)
6767 if (types_htab == NULL)
6770 types_htab = allocate_dwo_unit_table (objfile);
6772 types_htab = allocate_signatured_type_table (objfile);
6778 dwo_tu = OBSTACK_ZALLOC (&objfile->objfile_obstack,
6780 dwo_tu->dwo_file = dwo_file;
6781 dwo_tu->signature = header.signature;
6782 dwo_tu->type_offset_in_tu = header.type_cu_offset_in_tu;
6783 dwo_tu->section = section;
6784 dwo_tu->sect_off = sect_off;
6785 dwo_tu->length = length;
6789 /* N.B.: type_offset is not usable if this type uses a DWO file.
6790 The real type_offset is in the DWO file. */
6792 sig_type = OBSTACK_ZALLOC (&objfile->objfile_obstack,
6793 struct signatured_type);
6794 sig_type->signature = header.signature;
6795 sig_type->type_offset_in_tu = header.type_cu_offset_in_tu;
6796 sig_type->per_cu.dwarf2_per_objfile = dwarf2_per_objfile;
6797 sig_type->per_cu.is_debug_types = 1;
6798 sig_type->per_cu.section = section;
6799 sig_type->per_cu.sect_off = sect_off;
6800 sig_type->per_cu.length = length;
6803 slot = htab_find_slot (types_htab,
6804 dwo_file ? (void*) dwo_tu : (void *) sig_type,
6806 gdb_assert (slot != NULL);
6809 sect_offset dup_sect_off;
6813 const struct dwo_unit *dup_tu
6814 = (const struct dwo_unit *) *slot;
6816 dup_sect_off = dup_tu->sect_off;
6820 const struct signatured_type *dup_tu
6821 = (const struct signatured_type *) *slot;
6823 dup_sect_off = dup_tu->per_cu.sect_off;
6826 complaint (_("debug type entry at offset %s is duplicate to"
6827 " the entry at offset %s, signature %s"),
6828 sect_offset_str (sect_off), sect_offset_str (dup_sect_off),
6829 hex_string (header.signature));
6831 *slot = dwo_file ? (void *) dwo_tu : (void *) sig_type;
6833 if (dwarf_read_debug > 1)
6834 fprintf_unfiltered (gdb_stdlog, " offset %s, signature %s\n",
6835 sect_offset_str (sect_off),
6836 hex_string (header.signature));
6842 /* Create the hash table of all entries in the .debug_types
6843 (or .debug_types.dwo) section(s).
6844 If reading a DWO file, then DWO_FILE is a pointer to the DWO file object,
6845 otherwise it is NULL.
6847 The result is a pointer to the hash table or NULL if there are no types.
6849 Note: This function processes DWO files only, not DWP files. */
6852 create_debug_types_hash_table (struct dwarf2_per_objfile *dwarf2_per_objfile,
6853 struct dwo_file *dwo_file,
6854 VEC (dwarf2_section_info_def) *types,
6858 struct dwarf2_section_info *section;
6860 if (VEC_empty (dwarf2_section_info_def, types))
6864 VEC_iterate (dwarf2_section_info_def, types, ix, section);
6866 create_debug_type_hash_table (dwarf2_per_objfile, dwo_file, section,
6867 types_htab, rcuh_kind::TYPE);
6870 /* Create the hash table of all entries in the .debug_types section,
6871 and initialize all_type_units.
6872 The result is zero if there is an error (e.g. missing .debug_types section),
6873 otherwise non-zero. */
6876 create_all_type_units (struct dwarf2_per_objfile *dwarf2_per_objfile)
6878 htab_t types_htab = NULL;
6880 create_debug_type_hash_table (dwarf2_per_objfile, NULL,
6881 &dwarf2_per_objfile->info, types_htab,
6882 rcuh_kind::COMPILE);
6883 create_debug_types_hash_table (dwarf2_per_objfile, NULL,
6884 dwarf2_per_objfile->types, types_htab);
6885 if (types_htab == NULL)
6887 dwarf2_per_objfile->signatured_types = NULL;
6891 dwarf2_per_objfile->signatured_types = types_htab;
6893 gdb_assert (dwarf2_per_objfile->all_type_units.empty ());
6894 dwarf2_per_objfile->all_type_units.reserve (htab_elements (types_htab));
6896 htab_traverse_noresize (types_htab, add_signatured_type_cu_to_table,
6897 &dwarf2_per_objfile->all_type_units);
6902 /* Add an entry for signature SIG to dwarf2_per_objfile->signatured_types.
6903 If SLOT is non-NULL, it is the entry to use in the hash table.
6904 Otherwise we find one. */
6906 static struct signatured_type *
6907 add_type_unit (struct dwarf2_per_objfile *dwarf2_per_objfile, ULONGEST sig,
6910 struct objfile *objfile = dwarf2_per_objfile->objfile;
6912 if (dwarf2_per_objfile->all_type_units.size ()
6913 == dwarf2_per_objfile->all_type_units.capacity ())
6914 ++dwarf2_per_objfile->tu_stats.nr_all_type_units_reallocs;
6916 signatured_type *sig_type = OBSTACK_ZALLOC (&objfile->objfile_obstack,
6917 struct signatured_type);
6919 dwarf2_per_objfile->all_type_units.push_back (sig_type);
6920 sig_type->signature = sig;
6921 sig_type->per_cu.is_debug_types = 1;
6922 if (dwarf2_per_objfile->using_index)
6924 sig_type->per_cu.v.quick =
6925 OBSTACK_ZALLOC (&objfile->objfile_obstack,
6926 struct dwarf2_per_cu_quick_data);
6931 slot = htab_find_slot (dwarf2_per_objfile->signatured_types,
6934 gdb_assert (*slot == NULL);
6936 /* The rest of sig_type must be filled in by the caller. */
6940 /* Subroutine of lookup_dwo_signatured_type and lookup_dwp_signatured_type.
6941 Fill in SIG_ENTRY with DWO_ENTRY. */
6944 fill_in_sig_entry_from_dwo_entry (struct dwarf2_per_objfile *dwarf2_per_objfile,
6945 struct signatured_type *sig_entry,
6946 struct dwo_unit *dwo_entry)
6948 /* Make sure we're not clobbering something we don't expect to. */
6949 gdb_assert (! sig_entry->per_cu.queued);
6950 gdb_assert (sig_entry->per_cu.cu == NULL);
6951 if (dwarf2_per_objfile->using_index)
6953 gdb_assert (sig_entry->per_cu.v.quick != NULL);
6954 gdb_assert (sig_entry->per_cu.v.quick->compunit_symtab == NULL);
6957 gdb_assert (sig_entry->per_cu.v.psymtab == NULL);
6958 gdb_assert (sig_entry->signature == dwo_entry->signature);
6959 gdb_assert (to_underlying (sig_entry->type_offset_in_section) == 0);
6960 gdb_assert (sig_entry->type_unit_group == NULL);
6961 gdb_assert (sig_entry->dwo_unit == NULL);
6963 sig_entry->per_cu.section = dwo_entry->section;
6964 sig_entry->per_cu.sect_off = dwo_entry->sect_off;
6965 sig_entry->per_cu.length = dwo_entry->length;
6966 sig_entry->per_cu.reading_dwo_directly = 1;
6967 sig_entry->per_cu.dwarf2_per_objfile = dwarf2_per_objfile;
6968 sig_entry->type_offset_in_tu = dwo_entry->type_offset_in_tu;
6969 sig_entry->dwo_unit = dwo_entry;
6972 /* Subroutine of lookup_signatured_type.
6973 If we haven't read the TU yet, create the signatured_type data structure
6974 for a TU to be read in directly from a DWO file, bypassing the stub.
6975 This is the "Stay in DWO Optimization": When there is no DWP file and we're
6976 using .gdb_index, then when reading a CU we want to stay in the DWO file
6977 containing that CU. Otherwise we could end up reading several other DWO
6978 files (due to comdat folding) to process the transitive closure of all the
6979 mentioned TUs, and that can be slow. The current DWO file will have every
6980 type signature that it needs.
6981 We only do this for .gdb_index because in the psymtab case we already have
6982 to read all the DWOs to build the type unit groups. */
6984 static struct signatured_type *
6985 lookup_dwo_signatured_type (struct dwarf2_cu *cu, ULONGEST sig)
6987 struct dwarf2_per_objfile *dwarf2_per_objfile
6988 = cu->per_cu->dwarf2_per_objfile;
6989 struct objfile *objfile = dwarf2_per_objfile->objfile;
6990 struct dwo_file *dwo_file;
6991 struct dwo_unit find_dwo_entry, *dwo_entry;
6992 struct signatured_type find_sig_entry, *sig_entry;
6995 gdb_assert (cu->dwo_unit && dwarf2_per_objfile->using_index);
6997 /* If TU skeletons have been removed then we may not have read in any
6999 if (dwarf2_per_objfile->signatured_types == NULL)
7001 dwarf2_per_objfile->signatured_types
7002 = allocate_signatured_type_table (objfile);
7005 /* We only ever need to read in one copy of a signatured type.
7006 Use the global signatured_types array to do our own comdat-folding
7007 of types. If this is the first time we're reading this TU, and
7008 the TU has an entry in .gdb_index, replace the recorded data from
7009 .gdb_index with this TU. */
7011 find_sig_entry.signature = sig;
7012 slot = htab_find_slot (dwarf2_per_objfile->signatured_types,
7013 &find_sig_entry, INSERT);
7014 sig_entry = (struct signatured_type *) *slot;
7016 /* We can get here with the TU already read, *or* in the process of being
7017 read. Don't reassign the global entry to point to this DWO if that's
7018 the case. Also note that if the TU is already being read, it may not
7019 have come from a DWO, the program may be a mix of Fission-compiled
7020 code and non-Fission-compiled code. */
7022 /* Have we already tried to read this TU?
7023 Note: sig_entry can be NULL if the skeleton TU was removed (thus it
7024 needn't exist in the global table yet). */
7025 if (sig_entry != NULL && sig_entry->per_cu.tu_read)
7028 /* Note: cu->dwo_unit is the dwo_unit that references this TU, not the
7029 dwo_unit of the TU itself. */
7030 dwo_file = cu->dwo_unit->dwo_file;
7032 /* Ok, this is the first time we're reading this TU. */
7033 if (dwo_file->tus == NULL)
7035 find_dwo_entry.signature = sig;
7036 dwo_entry = (struct dwo_unit *) htab_find (dwo_file->tus, &find_dwo_entry);
7037 if (dwo_entry == NULL)
7040 /* If the global table doesn't have an entry for this TU, add one. */
7041 if (sig_entry == NULL)
7042 sig_entry = add_type_unit (dwarf2_per_objfile, sig, slot);
7044 fill_in_sig_entry_from_dwo_entry (dwarf2_per_objfile, sig_entry, dwo_entry);
7045 sig_entry->per_cu.tu_read = 1;
7049 /* Subroutine of lookup_signatured_type.
7050 Look up the type for signature SIG, and if we can't find SIG in .gdb_index
7051 then try the DWP file. If the TU stub (skeleton) has been removed then
7052 it won't be in .gdb_index. */
7054 static struct signatured_type *
7055 lookup_dwp_signatured_type (struct dwarf2_cu *cu, ULONGEST sig)
7057 struct dwarf2_per_objfile *dwarf2_per_objfile
7058 = cu->per_cu->dwarf2_per_objfile;
7059 struct objfile *objfile = dwarf2_per_objfile->objfile;
7060 struct dwp_file *dwp_file = get_dwp_file (dwarf2_per_objfile);
7061 struct dwo_unit *dwo_entry;
7062 struct signatured_type find_sig_entry, *sig_entry;
7065 gdb_assert (cu->dwo_unit && dwarf2_per_objfile->using_index);
7066 gdb_assert (dwp_file != NULL);
7068 /* If TU skeletons have been removed then we may not have read in any
7070 if (dwarf2_per_objfile->signatured_types == NULL)
7072 dwarf2_per_objfile->signatured_types
7073 = allocate_signatured_type_table (objfile);
7076 find_sig_entry.signature = sig;
7077 slot = htab_find_slot (dwarf2_per_objfile->signatured_types,
7078 &find_sig_entry, INSERT);
7079 sig_entry = (struct signatured_type *) *slot;
7081 /* Have we already tried to read this TU?
7082 Note: sig_entry can be NULL if the skeleton TU was removed (thus it
7083 needn't exist in the global table yet). */
7084 if (sig_entry != NULL)
7087 if (dwp_file->tus == NULL)
7089 dwo_entry = lookup_dwo_unit_in_dwp (dwarf2_per_objfile, dwp_file, NULL,
7090 sig, 1 /* is_debug_types */);
7091 if (dwo_entry == NULL)
7094 sig_entry = add_type_unit (dwarf2_per_objfile, sig, slot);
7095 fill_in_sig_entry_from_dwo_entry (dwarf2_per_objfile, sig_entry, dwo_entry);
7100 /* Lookup a signature based type for DW_FORM_ref_sig8.
7101 Returns NULL if signature SIG is not present in the table.
7102 It is up to the caller to complain about this. */
7104 static struct signatured_type *
7105 lookup_signatured_type (struct dwarf2_cu *cu, ULONGEST sig)
7107 struct dwarf2_per_objfile *dwarf2_per_objfile
7108 = cu->per_cu->dwarf2_per_objfile;
7111 && dwarf2_per_objfile->using_index)
7113 /* We're in a DWO/DWP file, and we're using .gdb_index.
7114 These cases require special processing. */
7115 if (get_dwp_file (dwarf2_per_objfile) == NULL)
7116 return lookup_dwo_signatured_type (cu, sig);
7118 return lookup_dwp_signatured_type (cu, sig);
7122 struct signatured_type find_entry, *entry;
7124 if (dwarf2_per_objfile->signatured_types == NULL)
7126 find_entry.signature = sig;
7127 entry = ((struct signatured_type *)
7128 htab_find (dwarf2_per_objfile->signatured_types, &find_entry));
7133 /* Low level DIE reading support. */
7135 /* Initialize a die_reader_specs struct from a dwarf2_cu struct. */
7138 init_cu_die_reader (struct die_reader_specs *reader,
7139 struct dwarf2_cu *cu,
7140 struct dwarf2_section_info *section,
7141 struct dwo_file *dwo_file,
7142 struct abbrev_table *abbrev_table)
7144 gdb_assert (section->readin && section->buffer != NULL);
7145 reader->abfd = get_section_bfd_owner (section);
7147 reader->dwo_file = dwo_file;
7148 reader->die_section = section;
7149 reader->buffer = section->buffer;
7150 reader->buffer_end = section->buffer + section->size;
7151 reader->comp_dir = NULL;
7152 reader->abbrev_table = abbrev_table;
7155 /* Subroutine of init_cutu_and_read_dies to simplify it.
7156 Read in the rest of a CU/TU top level DIE from DWO_UNIT.
7157 There's just a lot of work to do, and init_cutu_and_read_dies is big enough
7160 STUB_COMP_UNIT_DIE is for the stub DIE, we copy over certain attributes
7161 from it to the DIE in the DWO. If NULL we are skipping the stub.
7162 STUB_COMP_DIR is similar to STUB_COMP_UNIT_DIE: When reading a TU directly
7163 from the DWO file, bypassing the stub, it contains the DW_AT_comp_dir
7164 attribute of the referencing CU. At most one of STUB_COMP_UNIT_DIE and
7165 STUB_COMP_DIR may be non-NULL.
7166 *RESULT_READER,*RESULT_INFO_PTR,*RESULT_COMP_UNIT_DIE,*RESULT_HAS_CHILDREN
7167 are filled in with the info of the DIE from the DWO file.
7168 *RESULT_DWO_ABBREV_TABLE will be filled in with the abbrev table allocated
7169 from the dwo. Since *RESULT_READER references this abbrev table, it must be
7170 kept around for at least as long as *RESULT_READER.
7172 The result is non-zero if a valid (non-dummy) DIE was found. */
7175 read_cutu_die_from_dwo (struct dwarf2_per_cu_data *this_cu,
7176 struct dwo_unit *dwo_unit,
7177 struct die_info *stub_comp_unit_die,
7178 const char *stub_comp_dir,
7179 struct die_reader_specs *result_reader,
7180 const gdb_byte **result_info_ptr,
7181 struct die_info **result_comp_unit_die,
7182 int *result_has_children,
7183 abbrev_table_up *result_dwo_abbrev_table)
7185 struct dwarf2_per_objfile *dwarf2_per_objfile = this_cu->dwarf2_per_objfile;
7186 struct objfile *objfile = dwarf2_per_objfile->objfile;
7187 struct dwarf2_cu *cu = this_cu->cu;
7189 const gdb_byte *begin_info_ptr, *info_ptr;
7190 struct attribute *comp_dir, *stmt_list, *low_pc, *high_pc, *ranges;
7191 int i,num_extra_attrs;
7192 struct dwarf2_section_info *dwo_abbrev_section;
7193 struct attribute *attr;
7194 struct die_info *comp_unit_die;
7196 /* At most one of these may be provided. */
7197 gdb_assert ((stub_comp_unit_die != NULL) + (stub_comp_dir != NULL) <= 1);
7199 /* These attributes aren't processed until later:
7200 DW_AT_stmt_list, DW_AT_low_pc, DW_AT_high_pc, DW_AT_ranges.
7201 DW_AT_comp_dir is used now, to find the DWO file, but it is also
7202 referenced later. However, these attributes are found in the stub
7203 which we won't have later. In order to not impose this complication
7204 on the rest of the code, we read them here and copy them to the
7213 if (stub_comp_unit_die != NULL)
7215 /* For TUs in DWO files, the DW_AT_stmt_list attribute lives in the
7217 if (! this_cu->is_debug_types)
7218 stmt_list = dwarf2_attr (stub_comp_unit_die, DW_AT_stmt_list, cu);
7219 low_pc = dwarf2_attr (stub_comp_unit_die, DW_AT_low_pc, cu);
7220 high_pc = dwarf2_attr (stub_comp_unit_die, DW_AT_high_pc, cu);
7221 ranges = dwarf2_attr (stub_comp_unit_die, DW_AT_ranges, cu);
7222 comp_dir = dwarf2_attr (stub_comp_unit_die, DW_AT_comp_dir, cu);
7224 /* There should be a DW_AT_addr_base attribute here (if needed).
7225 We need the value before we can process DW_FORM_GNU_addr_index
7226 or DW_FORM_addrx. */
7228 attr = dwarf2_attr (stub_comp_unit_die, DW_AT_GNU_addr_base, cu);
7230 cu->addr_base = DW_UNSND (attr);
7232 /* There should be a DW_AT_ranges_base attribute here (if needed).
7233 We need the value before we can process DW_AT_ranges. */
7234 cu->ranges_base = 0;
7235 attr = dwarf2_attr (stub_comp_unit_die, DW_AT_GNU_ranges_base, cu);
7237 cu->ranges_base = DW_UNSND (attr);
7239 else if (stub_comp_dir != NULL)
7241 /* Reconstruct the comp_dir attribute to simplify the code below. */
7242 comp_dir = XOBNEW (&cu->comp_unit_obstack, struct attribute);
7243 comp_dir->name = DW_AT_comp_dir;
7244 comp_dir->form = DW_FORM_string;
7245 DW_STRING_IS_CANONICAL (comp_dir) = 0;
7246 DW_STRING (comp_dir) = stub_comp_dir;
7249 /* Set up for reading the DWO CU/TU. */
7250 cu->dwo_unit = dwo_unit;
7251 dwarf2_section_info *section = dwo_unit->section;
7252 dwarf2_read_section (objfile, section);
7253 abfd = get_section_bfd_owner (section);
7254 begin_info_ptr = info_ptr = (section->buffer
7255 + to_underlying (dwo_unit->sect_off));
7256 dwo_abbrev_section = &dwo_unit->dwo_file->sections.abbrev;
7258 if (this_cu->is_debug_types)
7260 struct signatured_type *sig_type = (struct signatured_type *) this_cu;
7262 info_ptr = read_and_check_comp_unit_head (dwarf2_per_objfile,
7263 &cu->header, section,
7265 info_ptr, rcuh_kind::TYPE);
7266 /* This is not an assert because it can be caused by bad debug info. */
7267 if (sig_type->signature != cu->header.signature)
7269 error (_("Dwarf Error: signature mismatch %s vs %s while reading"
7270 " TU at offset %s [in module %s]"),
7271 hex_string (sig_type->signature),
7272 hex_string (cu->header.signature),
7273 sect_offset_str (dwo_unit->sect_off),
7274 bfd_get_filename (abfd));
7276 gdb_assert (dwo_unit->sect_off == cu->header.sect_off);
7277 /* For DWOs coming from DWP files, we don't know the CU length
7278 nor the type's offset in the TU until now. */
7279 dwo_unit->length = get_cu_length (&cu->header);
7280 dwo_unit->type_offset_in_tu = cu->header.type_cu_offset_in_tu;
7282 /* Establish the type offset that can be used to lookup the type.
7283 For DWO files, we don't know it until now. */
7284 sig_type->type_offset_in_section
7285 = dwo_unit->sect_off + to_underlying (dwo_unit->type_offset_in_tu);
7289 info_ptr = read_and_check_comp_unit_head (dwarf2_per_objfile,
7290 &cu->header, section,
7292 info_ptr, rcuh_kind::COMPILE);
7293 gdb_assert (dwo_unit->sect_off == cu->header.sect_off);
7294 /* For DWOs coming from DWP files, we don't know the CU length
7296 dwo_unit->length = get_cu_length (&cu->header);
7299 *result_dwo_abbrev_table
7300 = abbrev_table_read_table (dwarf2_per_objfile, dwo_abbrev_section,
7301 cu->header.abbrev_sect_off);
7302 init_cu_die_reader (result_reader, cu, section, dwo_unit->dwo_file,
7303 result_dwo_abbrev_table->get ());
7305 /* Read in the die, but leave space to copy over the attributes
7306 from the stub. This has the benefit of simplifying the rest of
7307 the code - all the work to maintain the illusion of a single
7308 DW_TAG_{compile,type}_unit DIE is done here. */
7309 num_extra_attrs = ((stmt_list != NULL)
7313 + (comp_dir != NULL));
7314 info_ptr = read_full_die_1 (result_reader, result_comp_unit_die, info_ptr,
7315 result_has_children, num_extra_attrs);
7317 /* Copy over the attributes from the stub to the DIE we just read in. */
7318 comp_unit_die = *result_comp_unit_die;
7319 i = comp_unit_die->num_attrs;
7320 if (stmt_list != NULL)
7321 comp_unit_die->attrs[i++] = *stmt_list;
7323 comp_unit_die->attrs[i++] = *low_pc;
7324 if (high_pc != NULL)
7325 comp_unit_die->attrs[i++] = *high_pc;
7327 comp_unit_die->attrs[i++] = *ranges;
7328 if (comp_dir != NULL)
7329 comp_unit_die->attrs[i++] = *comp_dir;
7330 comp_unit_die->num_attrs += num_extra_attrs;
7332 if (dwarf_die_debug)
7334 fprintf_unfiltered (gdb_stdlog,
7335 "Read die from %s@0x%x of %s:\n",
7336 get_section_name (section),
7337 (unsigned) (begin_info_ptr - section->buffer),
7338 bfd_get_filename (abfd));
7339 dump_die (comp_unit_die, dwarf_die_debug);
7342 /* Save the comp_dir attribute. If there is no DWP file then we'll read
7343 TUs by skipping the stub and going directly to the entry in the DWO file.
7344 However, skipping the stub means we won't get DW_AT_comp_dir, so we have
7345 to get it via circuitous means. Blech. */
7346 if (comp_dir != NULL)
7347 result_reader->comp_dir = DW_STRING (comp_dir);
7349 /* Skip dummy compilation units. */
7350 if (info_ptr >= begin_info_ptr + dwo_unit->length
7351 || peek_abbrev_code (abfd, info_ptr) == 0)
7354 *result_info_ptr = info_ptr;
7358 /* Subroutine of init_cutu_and_read_dies to simplify it.
7359 Look up the DWO unit specified by COMP_UNIT_DIE of THIS_CU.
7360 Returns NULL if the specified DWO unit cannot be found. */
7362 static struct dwo_unit *
7363 lookup_dwo_unit (struct dwarf2_per_cu_data *this_cu,
7364 struct die_info *comp_unit_die)
7366 struct dwarf2_cu *cu = this_cu->cu;
7368 struct dwo_unit *dwo_unit;
7369 const char *comp_dir, *dwo_name;
7371 gdb_assert (cu != NULL);
7373 /* Yeah, we look dwo_name up again, but it simplifies the code. */
7374 dwo_name = dwarf2_string_attr (comp_unit_die, DW_AT_GNU_dwo_name, cu);
7375 comp_dir = dwarf2_string_attr (comp_unit_die, DW_AT_comp_dir, cu);
7377 if (this_cu->is_debug_types)
7379 struct signatured_type *sig_type;
7381 /* Since this_cu is the first member of struct signatured_type,
7382 we can go from a pointer to one to a pointer to the other. */
7383 sig_type = (struct signatured_type *) this_cu;
7384 signature = sig_type->signature;
7385 dwo_unit = lookup_dwo_type_unit (sig_type, dwo_name, comp_dir);
7389 struct attribute *attr;
7391 attr = dwarf2_attr (comp_unit_die, DW_AT_GNU_dwo_id, cu);
7393 error (_("Dwarf Error: missing dwo_id for dwo_name %s"
7395 dwo_name, objfile_name (this_cu->dwarf2_per_objfile->objfile));
7396 signature = DW_UNSND (attr);
7397 dwo_unit = lookup_dwo_comp_unit (this_cu, dwo_name, comp_dir,
7404 /* Subroutine of init_cutu_and_read_dies to simplify it.
7405 See it for a description of the parameters.
7406 Read a TU directly from a DWO file, bypassing the stub. */
7409 init_tu_and_read_dwo_dies (struct dwarf2_per_cu_data *this_cu,
7410 int use_existing_cu, int keep,
7411 die_reader_func_ftype *die_reader_func,
7414 std::unique_ptr<dwarf2_cu> new_cu;
7415 struct signatured_type *sig_type;
7416 struct die_reader_specs reader;
7417 const gdb_byte *info_ptr;
7418 struct die_info *comp_unit_die;
7420 struct dwarf2_per_objfile *dwarf2_per_objfile = this_cu->dwarf2_per_objfile;
7422 /* Verify we can do the following downcast, and that we have the
7424 gdb_assert (this_cu->is_debug_types && this_cu->reading_dwo_directly);
7425 sig_type = (struct signatured_type *) this_cu;
7426 gdb_assert (sig_type->dwo_unit != NULL);
7428 if (use_existing_cu && this_cu->cu != NULL)
7430 gdb_assert (this_cu->cu->dwo_unit == sig_type->dwo_unit);
7431 /* There's no need to do the rereading_dwo_cu handling that
7432 init_cutu_and_read_dies does since we don't read the stub. */
7436 /* If !use_existing_cu, this_cu->cu must be NULL. */
7437 gdb_assert (this_cu->cu == NULL);
7438 new_cu.reset (new dwarf2_cu (this_cu));
7441 /* A future optimization, if needed, would be to use an existing
7442 abbrev table. When reading DWOs with skeletonless TUs, all the TUs
7443 could share abbrev tables. */
7445 /* The abbreviation table used by READER, this must live at least as long as
7447 abbrev_table_up dwo_abbrev_table;
7449 if (read_cutu_die_from_dwo (this_cu, sig_type->dwo_unit,
7450 NULL /* stub_comp_unit_die */,
7451 sig_type->dwo_unit->dwo_file->comp_dir,
7453 &comp_unit_die, &has_children,
7454 &dwo_abbrev_table) == 0)
7460 /* All the "real" work is done here. */
7461 die_reader_func (&reader, info_ptr, comp_unit_die, has_children, data);
7463 /* This duplicates the code in init_cutu_and_read_dies,
7464 but the alternative is making the latter more complex.
7465 This function is only for the special case of using DWO files directly:
7466 no point in overly complicating the general case just to handle this. */
7467 if (new_cu != NULL && keep)
7469 /* Link this CU into read_in_chain. */
7470 this_cu->cu->read_in_chain = dwarf2_per_objfile->read_in_chain;
7471 dwarf2_per_objfile->read_in_chain = this_cu;
7472 /* The chain owns it now. */
7477 /* Initialize a CU (or TU) and read its DIEs.
7478 If the CU defers to a DWO file, read the DWO file as well.
7480 ABBREV_TABLE, if non-NULL, is the abbreviation table to use.
7481 Otherwise the table specified in the comp unit header is read in and used.
7482 This is an optimization for when we already have the abbrev table.
7484 If USE_EXISTING_CU is non-zero, and THIS_CU->cu is non-NULL, then use it.
7485 Otherwise, a new CU is allocated with xmalloc.
7487 If KEEP is non-zero, then if we allocated a dwarf2_cu we add it to
7488 read_in_chain. Otherwise the dwarf2_cu data is freed at the end.
7490 WARNING: If THIS_CU is a "dummy CU" (used as filler by the incremental
7491 linker) then DIE_READER_FUNC will not get called. */
7494 init_cutu_and_read_dies (struct dwarf2_per_cu_data *this_cu,
7495 struct abbrev_table *abbrev_table,
7496 int use_existing_cu, int keep,
7498 die_reader_func_ftype *die_reader_func,
7501 struct dwarf2_per_objfile *dwarf2_per_objfile = this_cu->dwarf2_per_objfile;
7502 struct objfile *objfile = dwarf2_per_objfile->objfile;
7503 struct dwarf2_section_info *section = this_cu->section;
7504 bfd *abfd = get_section_bfd_owner (section);
7505 struct dwarf2_cu *cu;
7506 const gdb_byte *begin_info_ptr, *info_ptr;
7507 struct die_reader_specs reader;
7508 struct die_info *comp_unit_die;
7510 struct attribute *attr;
7511 struct signatured_type *sig_type = NULL;
7512 struct dwarf2_section_info *abbrev_section;
7513 /* Non-zero if CU currently points to a DWO file and we need to
7514 reread it. When this happens we need to reread the skeleton die
7515 before we can reread the DWO file (this only applies to CUs, not TUs). */
7516 int rereading_dwo_cu = 0;
7518 if (dwarf_die_debug)
7519 fprintf_unfiltered (gdb_stdlog, "Reading %s unit at offset %s\n",
7520 this_cu->is_debug_types ? "type" : "comp",
7521 sect_offset_str (this_cu->sect_off));
7523 if (use_existing_cu)
7526 /* If we're reading a TU directly from a DWO file, including a virtual DWO
7527 file (instead of going through the stub), short-circuit all of this. */
7528 if (this_cu->reading_dwo_directly)
7530 /* Narrow down the scope of possibilities to have to understand. */
7531 gdb_assert (this_cu->is_debug_types);
7532 gdb_assert (abbrev_table == NULL);
7533 init_tu_and_read_dwo_dies (this_cu, use_existing_cu, keep,
7534 die_reader_func, data);
7538 /* This is cheap if the section is already read in. */
7539 dwarf2_read_section (objfile, section);
7541 begin_info_ptr = info_ptr = section->buffer + to_underlying (this_cu->sect_off);
7543 abbrev_section = get_abbrev_section_for_cu (this_cu);
7545 std::unique_ptr<dwarf2_cu> new_cu;
7546 if (use_existing_cu && this_cu->cu != NULL)
7549 /* If this CU is from a DWO file we need to start over, we need to
7550 refetch the attributes from the skeleton CU.
7551 This could be optimized by retrieving those attributes from when we
7552 were here the first time: the previous comp_unit_die was stored in
7553 comp_unit_obstack. But there's no data yet that we need this
7555 if (cu->dwo_unit != NULL)
7556 rereading_dwo_cu = 1;
7560 /* If !use_existing_cu, this_cu->cu must be NULL. */
7561 gdb_assert (this_cu->cu == NULL);
7562 new_cu.reset (new dwarf2_cu (this_cu));
7566 /* Get the header. */
7567 if (to_underlying (cu->header.first_die_cu_offset) != 0 && !rereading_dwo_cu)
7569 /* We already have the header, there's no need to read it in again. */
7570 info_ptr += to_underlying (cu->header.first_die_cu_offset);
7574 if (this_cu->is_debug_types)
7576 info_ptr = read_and_check_comp_unit_head (dwarf2_per_objfile,
7577 &cu->header, section,
7578 abbrev_section, info_ptr,
7581 /* Since per_cu is the first member of struct signatured_type,
7582 we can go from a pointer to one to a pointer to the other. */
7583 sig_type = (struct signatured_type *) this_cu;
7584 gdb_assert (sig_type->signature == cu->header.signature);
7585 gdb_assert (sig_type->type_offset_in_tu
7586 == cu->header.type_cu_offset_in_tu);
7587 gdb_assert (this_cu->sect_off == cu->header.sect_off);
7589 /* LENGTH has not been set yet for type units if we're
7590 using .gdb_index. */
7591 this_cu->length = get_cu_length (&cu->header);
7593 /* Establish the type offset that can be used to lookup the type. */
7594 sig_type->type_offset_in_section =
7595 this_cu->sect_off + to_underlying (sig_type->type_offset_in_tu);
7597 this_cu->dwarf_version = cu->header.version;
7601 info_ptr = read_and_check_comp_unit_head (dwarf2_per_objfile,
7602 &cu->header, section,
7605 rcuh_kind::COMPILE);
7607 gdb_assert (this_cu->sect_off == cu->header.sect_off);
7608 gdb_assert (this_cu->length == get_cu_length (&cu->header));
7609 this_cu->dwarf_version = cu->header.version;
7613 /* Skip dummy compilation units. */
7614 if (info_ptr >= begin_info_ptr + this_cu->length
7615 || peek_abbrev_code (abfd, info_ptr) == 0)
7618 /* If we don't have them yet, read the abbrevs for this compilation unit.
7619 And if we need to read them now, make sure they're freed when we're
7620 done (own the table through ABBREV_TABLE_HOLDER). */
7621 abbrev_table_up abbrev_table_holder;
7622 if (abbrev_table != NULL)
7623 gdb_assert (cu->header.abbrev_sect_off == abbrev_table->sect_off);
7627 = abbrev_table_read_table (dwarf2_per_objfile, abbrev_section,
7628 cu->header.abbrev_sect_off);
7629 abbrev_table = abbrev_table_holder.get ();
7632 /* Read the top level CU/TU die. */
7633 init_cu_die_reader (&reader, cu, section, NULL, abbrev_table);
7634 info_ptr = read_full_die (&reader, &comp_unit_die, info_ptr, &has_children);
7636 if (skip_partial && comp_unit_die->tag == DW_TAG_partial_unit)
7639 /* If we are in a DWO stub, process it and then read in the "real" CU/TU
7640 from the DWO file. read_cutu_die_from_dwo will allocate the abbreviation
7641 table from the DWO file and pass the ownership over to us. It will be
7642 referenced from READER, so we must make sure to free it after we're done
7645 Note that if USE_EXISTING_OK != 0, and THIS_CU->cu already contains a
7646 DWO CU, that this test will fail (the attribute will not be present). */
7647 attr = dwarf2_attr (comp_unit_die, DW_AT_GNU_dwo_name, cu);
7648 abbrev_table_up dwo_abbrev_table;
7651 struct dwo_unit *dwo_unit;
7652 struct die_info *dwo_comp_unit_die;
7656 complaint (_("compilation unit with DW_AT_GNU_dwo_name"
7657 " has children (offset %s) [in module %s]"),
7658 sect_offset_str (this_cu->sect_off),
7659 bfd_get_filename (abfd));
7661 dwo_unit = lookup_dwo_unit (this_cu, comp_unit_die);
7662 if (dwo_unit != NULL)
7664 if (read_cutu_die_from_dwo (this_cu, dwo_unit,
7665 comp_unit_die, NULL,
7667 &dwo_comp_unit_die, &has_children,
7668 &dwo_abbrev_table) == 0)
7673 comp_unit_die = dwo_comp_unit_die;
7677 /* Yikes, we couldn't find the rest of the DIE, we only have
7678 the stub. A complaint has already been logged. There's
7679 not much more we can do except pass on the stub DIE to
7680 die_reader_func. We don't want to throw an error on bad
7685 /* All of the above is setup for this call. Yikes. */
7686 die_reader_func (&reader, info_ptr, comp_unit_die, has_children, data);
7688 /* Done, clean up. */
7689 if (new_cu != NULL && keep)
7691 /* Link this CU into read_in_chain. */
7692 this_cu->cu->read_in_chain = dwarf2_per_objfile->read_in_chain;
7693 dwarf2_per_objfile->read_in_chain = this_cu;
7694 /* The chain owns it now. */
7699 /* Read CU/TU THIS_CU but do not follow DW_AT_GNU_dwo_name if present.
7700 DWO_FILE, if non-NULL, is the DWO file to read (the caller is assumed
7701 to have already done the lookup to find the DWO file).
7703 The caller is required to fill in THIS_CU->section, THIS_CU->offset, and
7704 THIS_CU->is_debug_types, but nothing else.
7706 We fill in THIS_CU->length.
7708 WARNING: If THIS_CU is a "dummy CU" (used as filler by the incremental
7709 linker) then DIE_READER_FUNC will not get called.
7711 THIS_CU->cu is always freed when done.
7712 This is done in order to not leave THIS_CU->cu in a state where we have
7713 to care whether it refers to the "main" CU or the DWO CU. */
7716 init_cutu_and_read_dies_no_follow (struct dwarf2_per_cu_data *this_cu,
7717 struct dwo_file *dwo_file,
7718 die_reader_func_ftype *die_reader_func,
7721 struct dwarf2_per_objfile *dwarf2_per_objfile = this_cu->dwarf2_per_objfile;
7722 struct objfile *objfile = dwarf2_per_objfile->objfile;
7723 struct dwarf2_section_info *section = this_cu->section;
7724 bfd *abfd = get_section_bfd_owner (section);
7725 struct dwarf2_section_info *abbrev_section;
7726 const gdb_byte *begin_info_ptr, *info_ptr;
7727 struct die_reader_specs reader;
7728 struct die_info *comp_unit_die;
7731 if (dwarf_die_debug)
7732 fprintf_unfiltered (gdb_stdlog, "Reading %s unit at offset %s\n",
7733 this_cu->is_debug_types ? "type" : "comp",
7734 sect_offset_str (this_cu->sect_off));
7736 gdb_assert (this_cu->cu == NULL);
7738 abbrev_section = (dwo_file != NULL
7739 ? &dwo_file->sections.abbrev
7740 : get_abbrev_section_for_cu (this_cu));
7742 /* This is cheap if the section is already read in. */
7743 dwarf2_read_section (objfile, section);
7745 struct dwarf2_cu cu (this_cu);
7747 begin_info_ptr = info_ptr = section->buffer + to_underlying (this_cu->sect_off);
7748 info_ptr = read_and_check_comp_unit_head (dwarf2_per_objfile,
7749 &cu.header, section,
7750 abbrev_section, info_ptr,
7751 (this_cu->is_debug_types
7753 : rcuh_kind::COMPILE));
7755 this_cu->length = get_cu_length (&cu.header);
7757 /* Skip dummy compilation units. */
7758 if (info_ptr >= begin_info_ptr + this_cu->length
7759 || peek_abbrev_code (abfd, info_ptr) == 0)
7762 abbrev_table_up abbrev_table
7763 = abbrev_table_read_table (dwarf2_per_objfile, abbrev_section,
7764 cu.header.abbrev_sect_off);
7766 init_cu_die_reader (&reader, &cu, section, dwo_file, abbrev_table.get ());
7767 info_ptr = read_full_die (&reader, &comp_unit_die, info_ptr, &has_children);
7769 die_reader_func (&reader, info_ptr, comp_unit_die, has_children, data);
7772 /* Read a CU/TU, except that this does not look for DW_AT_GNU_dwo_name and
7773 does not lookup the specified DWO file.
7774 This cannot be used to read DWO files.
7776 THIS_CU->cu is always freed when done.
7777 This is done in order to not leave THIS_CU->cu in a state where we have
7778 to care whether it refers to the "main" CU or the DWO CU.
7779 We can revisit this if the data shows there's a performance issue. */
7782 init_cutu_and_read_dies_simple (struct dwarf2_per_cu_data *this_cu,
7783 die_reader_func_ftype *die_reader_func,
7786 init_cutu_and_read_dies_no_follow (this_cu, NULL, die_reader_func, data);
7789 /* Type Unit Groups.
7791 Type Unit Groups are a way to collapse the set of all TUs (type units) into
7792 a more manageable set. The grouping is done by DW_AT_stmt_list entry
7793 so that all types coming from the same compilation (.o file) are grouped
7794 together. A future step could be to put the types in the same symtab as
7795 the CU the types ultimately came from. */
7798 hash_type_unit_group (const void *item)
7800 const struct type_unit_group *tu_group
7801 = (const struct type_unit_group *) item;
7803 return hash_stmt_list_entry (&tu_group->hash);
7807 eq_type_unit_group (const void *item_lhs, const void *item_rhs)
7809 const struct type_unit_group *lhs = (const struct type_unit_group *) item_lhs;
7810 const struct type_unit_group *rhs = (const struct type_unit_group *) item_rhs;
7812 return eq_stmt_list_entry (&lhs->hash, &rhs->hash);
7815 /* Allocate a hash table for type unit groups. */
7818 allocate_type_unit_groups_table (struct objfile *objfile)
7820 return htab_create_alloc_ex (3,
7821 hash_type_unit_group,
7824 &objfile->objfile_obstack,
7825 hashtab_obstack_allocate,
7826 dummy_obstack_deallocate);
7829 /* Type units that don't have DW_AT_stmt_list are grouped into their own
7830 partial symtabs. We combine several TUs per psymtab to not let the size
7831 of any one psymtab grow too big. */
7832 #define NO_STMT_LIST_TYPE_UNIT_PSYMTAB (1 << 31)
7833 #define NO_STMT_LIST_TYPE_UNIT_PSYMTAB_SIZE 10
7835 /* Helper routine for get_type_unit_group.
7836 Create the type_unit_group object used to hold one or more TUs. */
7838 static struct type_unit_group *
7839 create_type_unit_group (struct dwarf2_cu *cu, sect_offset line_offset_struct)
7841 struct dwarf2_per_objfile *dwarf2_per_objfile
7842 = cu->per_cu->dwarf2_per_objfile;
7843 struct objfile *objfile = dwarf2_per_objfile->objfile;
7844 struct dwarf2_per_cu_data *per_cu;
7845 struct type_unit_group *tu_group;
7847 tu_group = OBSTACK_ZALLOC (&objfile->objfile_obstack,
7848 struct type_unit_group);
7849 per_cu = &tu_group->per_cu;
7850 per_cu->dwarf2_per_objfile = dwarf2_per_objfile;
7852 if (dwarf2_per_objfile->using_index)
7854 per_cu->v.quick = OBSTACK_ZALLOC (&objfile->objfile_obstack,
7855 struct dwarf2_per_cu_quick_data);
7859 unsigned int line_offset = to_underlying (line_offset_struct);
7860 struct partial_symtab *pst;
7863 /* Give the symtab a useful name for debug purposes. */
7864 if ((line_offset & NO_STMT_LIST_TYPE_UNIT_PSYMTAB) != 0)
7865 name = string_printf ("<type_units_%d>",
7866 (line_offset & ~NO_STMT_LIST_TYPE_UNIT_PSYMTAB));
7868 name = string_printf ("<type_units_at_0x%x>", line_offset);
7870 pst = create_partial_symtab (per_cu, name.c_str ());
7874 tu_group->hash.dwo_unit = cu->dwo_unit;
7875 tu_group->hash.line_sect_off = line_offset_struct;
7880 /* Look up the type_unit_group for type unit CU, and create it if necessary.
7881 STMT_LIST is a DW_AT_stmt_list attribute. */
7883 static struct type_unit_group *
7884 get_type_unit_group (struct dwarf2_cu *cu, const struct attribute *stmt_list)
7886 struct dwarf2_per_objfile *dwarf2_per_objfile
7887 = cu->per_cu->dwarf2_per_objfile;
7888 struct tu_stats *tu_stats = &dwarf2_per_objfile->tu_stats;
7889 struct type_unit_group *tu_group;
7891 unsigned int line_offset;
7892 struct type_unit_group type_unit_group_for_lookup;
7894 if (dwarf2_per_objfile->type_unit_groups == NULL)
7896 dwarf2_per_objfile->type_unit_groups =
7897 allocate_type_unit_groups_table (dwarf2_per_objfile->objfile);
7900 /* Do we need to create a new group, or can we use an existing one? */
7904 line_offset = DW_UNSND (stmt_list);
7905 ++tu_stats->nr_symtab_sharers;
7909 /* Ugh, no stmt_list. Rare, but we have to handle it.
7910 We can do various things here like create one group per TU or
7911 spread them over multiple groups to split up the expansion work.
7912 To avoid worst case scenarios (too many groups or too large groups)
7913 we, umm, group them in bunches. */
7914 line_offset = (NO_STMT_LIST_TYPE_UNIT_PSYMTAB
7915 | (tu_stats->nr_stmt_less_type_units
7916 / NO_STMT_LIST_TYPE_UNIT_PSYMTAB_SIZE));
7917 ++tu_stats->nr_stmt_less_type_units;
7920 type_unit_group_for_lookup.hash.dwo_unit = cu->dwo_unit;
7921 type_unit_group_for_lookup.hash.line_sect_off = (sect_offset) line_offset;
7922 slot = htab_find_slot (dwarf2_per_objfile->type_unit_groups,
7923 &type_unit_group_for_lookup, INSERT);
7926 tu_group = (struct type_unit_group *) *slot;
7927 gdb_assert (tu_group != NULL);
7931 sect_offset line_offset_struct = (sect_offset) line_offset;
7932 tu_group = create_type_unit_group (cu, line_offset_struct);
7934 ++tu_stats->nr_symtabs;
7940 /* Partial symbol tables. */
7942 /* Create a psymtab named NAME and assign it to PER_CU.
7944 The caller must fill in the following details:
7945 dirname, textlow, texthigh. */
7947 static struct partial_symtab *
7948 create_partial_symtab (struct dwarf2_per_cu_data *per_cu, const char *name)
7950 struct objfile *objfile = per_cu->dwarf2_per_objfile->objfile;
7951 struct partial_symtab *pst;
7953 pst = start_psymtab_common (objfile, name, 0);
7955 pst->psymtabs_addrmap_supported = 1;
7957 /* This is the glue that links PST into GDB's symbol API. */
7958 pst->read_symtab_private = per_cu;
7959 pst->read_symtab = dwarf2_read_symtab;
7960 per_cu->v.psymtab = pst;
7965 /* The DATA object passed to process_psymtab_comp_unit_reader has this
7968 struct process_psymtab_comp_unit_data
7970 /* True if we are reading a DW_TAG_partial_unit. */
7972 int want_partial_unit;
7974 /* The "pretend" language that is used if the CU doesn't declare a
7977 enum language pretend_language;
7980 /* die_reader_func for process_psymtab_comp_unit. */
7983 process_psymtab_comp_unit_reader (const struct die_reader_specs *reader,
7984 const gdb_byte *info_ptr,
7985 struct die_info *comp_unit_die,
7989 struct dwarf2_cu *cu = reader->cu;
7990 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
7991 struct gdbarch *gdbarch = get_objfile_arch (objfile);
7992 struct dwarf2_per_cu_data *per_cu = cu->per_cu;
7994 CORE_ADDR best_lowpc = 0, best_highpc = 0;
7995 struct partial_symtab *pst;
7996 enum pc_bounds_kind cu_bounds_kind;
7997 const char *filename;
7998 struct process_psymtab_comp_unit_data *info
7999 = (struct process_psymtab_comp_unit_data *) data;
8001 if (comp_unit_die->tag == DW_TAG_partial_unit && !info->want_partial_unit)
8004 gdb_assert (! per_cu->is_debug_types);
8006 prepare_one_comp_unit (cu, comp_unit_die, info->pretend_language);
8008 /* Allocate a new partial symbol table structure. */
8009 filename = dwarf2_string_attr (comp_unit_die, DW_AT_name, cu);
8010 if (filename == NULL)
8013 pst = create_partial_symtab (per_cu, filename);
8015 /* This must be done before calling dwarf2_build_include_psymtabs. */
8016 pst->dirname = dwarf2_string_attr (comp_unit_die, DW_AT_comp_dir, cu);
8018 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
8020 dwarf2_find_base_address (comp_unit_die, cu);
8022 /* Possibly set the default values of LOWPC and HIGHPC from
8024 cu_bounds_kind = dwarf2_get_pc_bounds (comp_unit_die, &best_lowpc,
8025 &best_highpc, cu, pst);
8026 if (cu_bounds_kind == PC_BOUNDS_HIGH_LOW && best_lowpc < best_highpc)
8029 = (gdbarch_adjust_dwarf2_addr (gdbarch, best_lowpc + baseaddr)
8032 = (gdbarch_adjust_dwarf2_addr (gdbarch, best_highpc + baseaddr)
8034 /* Store the contiguous range if it is not empty; it can be
8035 empty for CUs with no code. */
8036 addrmap_set_empty (objfile->partial_symtabs->psymtabs_addrmap,
8040 /* Check if comp unit has_children.
8041 If so, read the rest of the partial symbols from this comp unit.
8042 If not, there's no more debug_info for this comp unit. */
8045 struct partial_die_info *first_die;
8046 CORE_ADDR lowpc, highpc;
8048 lowpc = ((CORE_ADDR) -1);
8049 highpc = ((CORE_ADDR) 0);
8051 first_die = load_partial_dies (reader, info_ptr, 1);
8053 scan_partial_symbols (first_die, &lowpc, &highpc,
8054 cu_bounds_kind <= PC_BOUNDS_INVALID, cu);
8056 /* If we didn't find a lowpc, set it to highpc to avoid
8057 complaints from `maint check'. */
8058 if (lowpc == ((CORE_ADDR) -1))
8061 /* If the compilation unit didn't have an explicit address range,
8062 then use the information extracted from its child dies. */
8063 if (cu_bounds_kind <= PC_BOUNDS_INVALID)
8066 best_highpc = highpc;
8069 pst->set_text_low (gdbarch_adjust_dwarf2_addr (gdbarch,
8070 best_lowpc + baseaddr)
8072 pst->set_text_high (gdbarch_adjust_dwarf2_addr (gdbarch,
8073 best_highpc + baseaddr)
8076 end_psymtab_common (objfile, pst);
8078 if (!VEC_empty (dwarf2_per_cu_ptr, cu->per_cu->imported_symtabs))
8081 int len = VEC_length (dwarf2_per_cu_ptr, cu->per_cu->imported_symtabs);
8082 struct dwarf2_per_cu_data *iter;
8084 /* Fill in 'dependencies' here; we fill in 'users' in a
8086 pst->number_of_dependencies = len;
8088 = objfile->partial_symtabs->allocate_dependencies (len);
8090 VEC_iterate (dwarf2_per_cu_ptr, cu->per_cu->imported_symtabs,
8093 pst->dependencies[i] = iter->v.psymtab;
8095 VEC_free (dwarf2_per_cu_ptr, cu->per_cu->imported_symtabs);
8098 /* Get the list of files included in the current compilation unit,
8099 and build a psymtab for each of them. */
8100 dwarf2_build_include_psymtabs (cu, comp_unit_die, pst);
8102 if (dwarf_read_debug)
8103 fprintf_unfiltered (gdb_stdlog,
8104 "Psymtab for %s unit @%s: %s - %s"
8105 ", %d global, %d static syms\n",
8106 per_cu->is_debug_types ? "type" : "comp",
8107 sect_offset_str (per_cu->sect_off),
8108 paddress (gdbarch, pst->text_low (objfile)),
8109 paddress (gdbarch, pst->text_high (objfile)),
8110 pst->n_global_syms, pst->n_static_syms);
8113 /* Subroutine of dwarf2_build_psymtabs_hard to simplify it.
8114 Process compilation unit THIS_CU for a psymtab. */
8117 process_psymtab_comp_unit (struct dwarf2_per_cu_data *this_cu,
8118 int want_partial_unit,
8119 enum language pretend_language)
8121 /* If this compilation unit was already read in, free the
8122 cached copy in order to read it in again. This is
8123 necessary because we skipped some symbols when we first
8124 read in the compilation unit (see load_partial_dies).
8125 This problem could be avoided, but the benefit is unclear. */
8126 if (this_cu->cu != NULL)
8127 free_one_cached_comp_unit (this_cu);
8129 if (this_cu->is_debug_types)
8130 init_cutu_and_read_dies (this_cu, NULL, 0, 0, false,
8131 build_type_psymtabs_reader, NULL);
8134 process_psymtab_comp_unit_data info;
8135 info.want_partial_unit = want_partial_unit;
8136 info.pretend_language = pretend_language;
8137 init_cutu_and_read_dies (this_cu, NULL, 0, 0, false,
8138 process_psymtab_comp_unit_reader, &info);
8141 /* Age out any secondary CUs. */
8142 age_cached_comp_units (this_cu->dwarf2_per_objfile);
8145 /* Reader function for build_type_psymtabs. */
8148 build_type_psymtabs_reader (const struct die_reader_specs *reader,
8149 const gdb_byte *info_ptr,
8150 struct die_info *type_unit_die,
8154 struct dwarf2_per_objfile *dwarf2_per_objfile
8155 = reader->cu->per_cu->dwarf2_per_objfile;
8156 struct objfile *objfile = dwarf2_per_objfile->objfile;
8157 struct dwarf2_cu *cu = reader->cu;
8158 struct dwarf2_per_cu_data *per_cu = cu->per_cu;
8159 struct signatured_type *sig_type;
8160 struct type_unit_group *tu_group;
8161 struct attribute *attr;
8162 struct partial_die_info *first_die;
8163 CORE_ADDR lowpc, highpc;
8164 struct partial_symtab *pst;
8166 gdb_assert (data == NULL);
8167 gdb_assert (per_cu->is_debug_types);
8168 sig_type = (struct signatured_type *) per_cu;
8173 attr = dwarf2_attr_no_follow (type_unit_die, DW_AT_stmt_list);
8174 tu_group = get_type_unit_group (cu, attr);
8176 VEC_safe_push (sig_type_ptr, tu_group->tus, sig_type);
8178 prepare_one_comp_unit (cu, type_unit_die, language_minimal);
8179 pst = create_partial_symtab (per_cu, "");
8182 first_die = load_partial_dies (reader, info_ptr, 1);
8184 lowpc = (CORE_ADDR) -1;
8185 highpc = (CORE_ADDR) 0;
8186 scan_partial_symbols (first_die, &lowpc, &highpc, 0, cu);
8188 end_psymtab_common (objfile, pst);
8191 /* Struct used to sort TUs by their abbreviation table offset. */
8193 struct tu_abbrev_offset
8195 tu_abbrev_offset (signatured_type *sig_type_, sect_offset abbrev_offset_)
8196 : sig_type (sig_type_), abbrev_offset (abbrev_offset_)
8199 signatured_type *sig_type;
8200 sect_offset abbrev_offset;
8203 /* Helper routine for build_type_psymtabs_1, passed to std::sort. */
8206 sort_tu_by_abbrev_offset (const struct tu_abbrev_offset &a,
8207 const struct tu_abbrev_offset &b)
8209 return a.abbrev_offset < b.abbrev_offset;
8212 /* Efficiently read all the type units.
8213 This does the bulk of the work for build_type_psymtabs.
8215 The efficiency is because we sort TUs by the abbrev table they use and
8216 only read each abbrev table once. In one program there are 200K TUs
8217 sharing 8K abbrev tables.
8219 The main purpose of this function is to support building the
8220 dwarf2_per_objfile->type_unit_groups table.
8221 TUs typically share the DW_AT_stmt_list of the CU they came from, so we
8222 can collapse the search space by grouping them by stmt_list.
8223 The savings can be significant, in the same program from above the 200K TUs
8224 share 8K stmt_list tables.
8226 FUNC is expected to call get_type_unit_group, which will create the
8227 struct type_unit_group if necessary and add it to
8228 dwarf2_per_objfile->type_unit_groups. */
8231 build_type_psymtabs_1 (struct dwarf2_per_objfile *dwarf2_per_objfile)
8233 struct tu_stats *tu_stats = &dwarf2_per_objfile->tu_stats;
8234 abbrev_table_up abbrev_table;
8235 sect_offset abbrev_offset;
8237 /* It's up to the caller to not call us multiple times. */
8238 gdb_assert (dwarf2_per_objfile->type_unit_groups == NULL);
8240 if (dwarf2_per_objfile->all_type_units.empty ())
8243 /* TUs typically share abbrev tables, and there can be way more TUs than
8244 abbrev tables. Sort by abbrev table to reduce the number of times we
8245 read each abbrev table in.
8246 Alternatives are to punt or to maintain a cache of abbrev tables.
8247 This is simpler and efficient enough for now.
8249 Later we group TUs by their DW_AT_stmt_list value (as this defines the
8250 symtab to use). Typically TUs with the same abbrev offset have the same
8251 stmt_list value too so in practice this should work well.
8253 The basic algorithm here is:
8255 sort TUs by abbrev table
8256 for each TU with same abbrev table:
8257 read abbrev table if first user
8258 read TU top level DIE
8259 [IWBN if DWO skeletons had DW_AT_stmt_list]
8262 if (dwarf_read_debug)
8263 fprintf_unfiltered (gdb_stdlog, "Building type unit groups ...\n");
8265 /* Sort in a separate table to maintain the order of all_type_units
8266 for .gdb_index: TU indices directly index all_type_units. */
8267 std::vector<tu_abbrev_offset> sorted_by_abbrev;
8268 sorted_by_abbrev.reserve (dwarf2_per_objfile->all_type_units.size ());
8270 for (signatured_type *sig_type : dwarf2_per_objfile->all_type_units)
8271 sorted_by_abbrev.emplace_back
8272 (sig_type, read_abbrev_offset (dwarf2_per_objfile,
8273 sig_type->per_cu.section,
8274 sig_type->per_cu.sect_off));
8276 std::sort (sorted_by_abbrev.begin (), sorted_by_abbrev.end (),
8277 sort_tu_by_abbrev_offset);
8279 abbrev_offset = (sect_offset) ~(unsigned) 0;
8281 for (const tu_abbrev_offset &tu : sorted_by_abbrev)
8283 /* Switch to the next abbrev table if necessary. */
8284 if (abbrev_table == NULL
8285 || tu.abbrev_offset != abbrev_offset)
8287 abbrev_offset = tu.abbrev_offset;
8289 abbrev_table_read_table (dwarf2_per_objfile,
8290 &dwarf2_per_objfile->abbrev,
8292 ++tu_stats->nr_uniq_abbrev_tables;
8295 init_cutu_and_read_dies (&tu.sig_type->per_cu, abbrev_table.get (),
8296 0, 0, false, build_type_psymtabs_reader, NULL);
8300 /* Print collected type unit statistics. */
8303 print_tu_stats (struct dwarf2_per_objfile *dwarf2_per_objfile)
8305 struct tu_stats *tu_stats = &dwarf2_per_objfile->tu_stats;
8307 fprintf_unfiltered (gdb_stdlog, "Type unit statistics:\n");
8308 fprintf_unfiltered (gdb_stdlog, " %zu TUs\n",
8309 dwarf2_per_objfile->all_type_units.size ());
8310 fprintf_unfiltered (gdb_stdlog, " %d uniq abbrev tables\n",
8311 tu_stats->nr_uniq_abbrev_tables);
8312 fprintf_unfiltered (gdb_stdlog, " %d symtabs from stmt_list entries\n",
8313 tu_stats->nr_symtabs);
8314 fprintf_unfiltered (gdb_stdlog, " %d symtab sharers\n",
8315 tu_stats->nr_symtab_sharers);
8316 fprintf_unfiltered (gdb_stdlog, " %d type units without a stmt_list\n",
8317 tu_stats->nr_stmt_less_type_units);
8318 fprintf_unfiltered (gdb_stdlog, " %d all_type_units reallocs\n",
8319 tu_stats->nr_all_type_units_reallocs);
8322 /* Traversal function for build_type_psymtabs. */
8325 build_type_psymtab_dependencies (void **slot, void *info)
8327 struct dwarf2_per_objfile *dwarf2_per_objfile
8328 = (struct dwarf2_per_objfile *) info;
8329 struct objfile *objfile = dwarf2_per_objfile->objfile;
8330 struct type_unit_group *tu_group = (struct type_unit_group *) *slot;
8331 struct dwarf2_per_cu_data *per_cu = &tu_group->per_cu;
8332 struct partial_symtab *pst = per_cu->v.psymtab;
8333 int len = VEC_length (sig_type_ptr, tu_group->tus);
8334 struct signatured_type *iter;
8337 gdb_assert (len > 0);
8338 gdb_assert (IS_TYPE_UNIT_GROUP (per_cu));
8340 pst->number_of_dependencies = len;
8341 pst->dependencies = objfile->partial_symtabs->allocate_dependencies (len);
8343 VEC_iterate (sig_type_ptr, tu_group->tus, i, iter);
8346 gdb_assert (iter->per_cu.is_debug_types);
8347 pst->dependencies[i] = iter->per_cu.v.psymtab;
8348 iter->type_unit_group = tu_group;
8351 VEC_free (sig_type_ptr, tu_group->tus);
8356 /* Subroutine of dwarf2_build_psymtabs_hard to simplify it.
8357 Build partial symbol tables for the .debug_types comp-units. */
8360 build_type_psymtabs (struct dwarf2_per_objfile *dwarf2_per_objfile)
8362 if (! create_all_type_units (dwarf2_per_objfile))
8365 build_type_psymtabs_1 (dwarf2_per_objfile);
8368 /* Traversal function for process_skeletonless_type_unit.
8369 Read a TU in a DWO file and build partial symbols for it. */
8372 process_skeletonless_type_unit (void **slot, void *info)
8374 struct dwo_unit *dwo_unit = (struct dwo_unit *) *slot;
8375 struct dwarf2_per_objfile *dwarf2_per_objfile
8376 = (struct dwarf2_per_objfile *) info;
8377 struct signatured_type find_entry, *entry;
8379 /* If this TU doesn't exist in the global table, add it and read it in. */
8381 if (dwarf2_per_objfile->signatured_types == NULL)
8383 dwarf2_per_objfile->signatured_types
8384 = allocate_signatured_type_table (dwarf2_per_objfile->objfile);
8387 find_entry.signature = dwo_unit->signature;
8388 slot = htab_find_slot (dwarf2_per_objfile->signatured_types, &find_entry,
8390 /* If we've already seen this type there's nothing to do. What's happening
8391 is we're doing our own version of comdat-folding here. */
8395 /* This does the job that create_all_type_units would have done for
8397 entry = add_type_unit (dwarf2_per_objfile, dwo_unit->signature, slot);
8398 fill_in_sig_entry_from_dwo_entry (dwarf2_per_objfile, entry, dwo_unit);
8401 /* This does the job that build_type_psymtabs_1 would have done. */
8402 init_cutu_and_read_dies (&entry->per_cu, NULL, 0, 0, false,
8403 build_type_psymtabs_reader, NULL);
8408 /* Traversal function for process_skeletonless_type_units. */
8411 process_dwo_file_for_skeletonless_type_units (void **slot, void *info)
8413 struct dwo_file *dwo_file = (struct dwo_file *) *slot;
8415 if (dwo_file->tus != NULL)
8417 htab_traverse_noresize (dwo_file->tus,
8418 process_skeletonless_type_unit, info);
8424 /* Scan all TUs of DWO files, verifying we've processed them.
8425 This is needed in case a TU was emitted without its skeleton.
8426 Note: This can't be done until we know what all the DWO files are. */
8429 process_skeletonless_type_units (struct dwarf2_per_objfile *dwarf2_per_objfile)
8431 /* Skeletonless TUs in DWP files without .gdb_index is not supported yet. */
8432 if (get_dwp_file (dwarf2_per_objfile) == NULL
8433 && dwarf2_per_objfile->dwo_files != NULL)
8435 htab_traverse_noresize (dwarf2_per_objfile->dwo_files,
8436 process_dwo_file_for_skeletonless_type_units,
8437 dwarf2_per_objfile);
8441 /* Compute the 'user' field for each psymtab in DWARF2_PER_OBJFILE. */
8444 set_partial_user (struct dwarf2_per_objfile *dwarf2_per_objfile)
8446 for (dwarf2_per_cu_data *per_cu : dwarf2_per_objfile->all_comp_units)
8448 struct partial_symtab *pst = per_cu->v.psymtab;
8453 for (int j = 0; j < pst->number_of_dependencies; ++j)
8455 /* Set the 'user' field only if it is not already set. */
8456 if (pst->dependencies[j]->user == NULL)
8457 pst->dependencies[j]->user = pst;
8462 /* Build the partial symbol table by doing a quick pass through the
8463 .debug_info and .debug_abbrev sections. */
8466 dwarf2_build_psymtabs_hard (struct dwarf2_per_objfile *dwarf2_per_objfile)
8468 struct objfile *objfile = dwarf2_per_objfile->objfile;
8470 if (dwarf_read_debug)
8472 fprintf_unfiltered (gdb_stdlog, "Building psymtabs of objfile %s ...\n",
8473 objfile_name (objfile));
8476 dwarf2_per_objfile->reading_partial_symbols = 1;
8478 dwarf2_read_section (objfile, &dwarf2_per_objfile->info);
8480 /* Any cached compilation units will be linked by the per-objfile
8481 read_in_chain. Make sure to free them when we're done. */
8482 free_cached_comp_units freer (dwarf2_per_objfile);
8484 build_type_psymtabs (dwarf2_per_objfile);
8486 create_all_comp_units (dwarf2_per_objfile);
8488 /* Create a temporary address map on a temporary obstack. We later
8489 copy this to the final obstack. */
8490 auto_obstack temp_obstack;
8492 scoped_restore save_psymtabs_addrmap
8493 = make_scoped_restore (&objfile->partial_symtabs->psymtabs_addrmap,
8494 addrmap_create_mutable (&temp_obstack));
8496 for (dwarf2_per_cu_data *per_cu : dwarf2_per_objfile->all_comp_units)
8497 process_psymtab_comp_unit (per_cu, 0, language_minimal);
8499 /* This has to wait until we read the CUs, we need the list of DWOs. */
8500 process_skeletonless_type_units (dwarf2_per_objfile);
8502 /* Now that all TUs have been processed we can fill in the dependencies. */
8503 if (dwarf2_per_objfile->type_unit_groups != NULL)
8505 htab_traverse_noresize (dwarf2_per_objfile->type_unit_groups,
8506 build_type_psymtab_dependencies, dwarf2_per_objfile);
8509 if (dwarf_read_debug)
8510 print_tu_stats (dwarf2_per_objfile);
8512 set_partial_user (dwarf2_per_objfile);
8514 objfile->partial_symtabs->psymtabs_addrmap
8515 = addrmap_create_fixed (objfile->partial_symtabs->psymtabs_addrmap,
8516 objfile->partial_symtabs->obstack ());
8517 /* At this point we want to keep the address map. */
8518 save_psymtabs_addrmap.release ();
8520 if (dwarf_read_debug)
8521 fprintf_unfiltered (gdb_stdlog, "Done building psymtabs of %s\n",
8522 objfile_name (objfile));
8525 /* die_reader_func for load_partial_comp_unit. */
8528 load_partial_comp_unit_reader (const struct die_reader_specs *reader,
8529 const gdb_byte *info_ptr,
8530 struct die_info *comp_unit_die,
8534 struct dwarf2_cu *cu = reader->cu;
8536 prepare_one_comp_unit (cu, comp_unit_die, language_minimal);
8538 /* Check if comp unit has_children.
8539 If so, read the rest of the partial symbols from this comp unit.
8540 If not, there's no more debug_info for this comp unit. */
8542 load_partial_dies (reader, info_ptr, 0);
8545 /* Load the partial DIEs for a secondary CU into memory.
8546 This is also used when rereading a primary CU with load_all_dies. */
8549 load_partial_comp_unit (struct dwarf2_per_cu_data *this_cu)
8551 init_cutu_and_read_dies (this_cu, NULL, 1, 1, false,
8552 load_partial_comp_unit_reader, NULL);
8556 read_comp_units_from_section (struct dwarf2_per_objfile *dwarf2_per_objfile,
8557 struct dwarf2_section_info *section,
8558 struct dwarf2_section_info *abbrev_section,
8559 unsigned int is_dwz)
8561 const gdb_byte *info_ptr;
8562 struct objfile *objfile = dwarf2_per_objfile->objfile;
8564 if (dwarf_read_debug)
8565 fprintf_unfiltered (gdb_stdlog, "Reading %s for %s\n",
8566 get_section_name (section),
8567 get_section_file_name (section));
8569 dwarf2_read_section (objfile, section);
8571 info_ptr = section->buffer;
8573 while (info_ptr < section->buffer + section->size)
8575 struct dwarf2_per_cu_data *this_cu;
8577 sect_offset sect_off = (sect_offset) (info_ptr - section->buffer);
8579 comp_unit_head cu_header;
8580 read_and_check_comp_unit_head (dwarf2_per_objfile, &cu_header, section,
8581 abbrev_section, info_ptr,
8582 rcuh_kind::COMPILE);
8584 /* Save the compilation unit for later lookup. */
8585 if (cu_header.unit_type != DW_UT_type)
8587 this_cu = XOBNEW (&objfile->objfile_obstack,
8588 struct dwarf2_per_cu_data);
8589 memset (this_cu, 0, sizeof (*this_cu));
8593 auto sig_type = XOBNEW (&objfile->objfile_obstack,
8594 struct signatured_type);
8595 memset (sig_type, 0, sizeof (*sig_type));
8596 sig_type->signature = cu_header.signature;
8597 sig_type->type_offset_in_tu = cu_header.type_cu_offset_in_tu;
8598 this_cu = &sig_type->per_cu;
8600 this_cu->is_debug_types = (cu_header.unit_type == DW_UT_type);
8601 this_cu->sect_off = sect_off;
8602 this_cu->length = cu_header.length + cu_header.initial_length_size;
8603 this_cu->is_dwz = is_dwz;
8604 this_cu->dwarf2_per_objfile = dwarf2_per_objfile;
8605 this_cu->section = section;
8607 dwarf2_per_objfile->all_comp_units.push_back (this_cu);
8609 info_ptr = info_ptr + this_cu->length;
8613 /* Create a list of all compilation units in OBJFILE.
8614 This is only done for -readnow and building partial symtabs. */
8617 create_all_comp_units (struct dwarf2_per_objfile *dwarf2_per_objfile)
8619 gdb_assert (dwarf2_per_objfile->all_comp_units.empty ());
8620 read_comp_units_from_section (dwarf2_per_objfile, &dwarf2_per_objfile->info,
8621 &dwarf2_per_objfile->abbrev, 0);
8623 dwz_file *dwz = dwarf2_get_dwz_file (dwarf2_per_objfile);
8625 read_comp_units_from_section (dwarf2_per_objfile, &dwz->info, &dwz->abbrev,
8629 /* Process all loaded DIEs for compilation unit CU, starting at
8630 FIRST_DIE. The caller should pass SET_ADDRMAP == 1 if the compilation
8631 unit DIE did not have PC info (DW_AT_low_pc and DW_AT_high_pc, or
8632 DW_AT_ranges). See the comments of add_partial_subprogram on how
8633 SET_ADDRMAP is used and how *LOWPC and *HIGHPC are updated. */
8636 scan_partial_symbols (struct partial_die_info *first_die, CORE_ADDR *lowpc,
8637 CORE_ADDR *highpc, int set_addrmap,
8638 struct dwarf2_cu *cu)
8640 struct partial_die_info *pdi;
8642 /* Now, march along the PDI's, descending into ones which have
8643 interesting children but skipping the children of the other ones,
8644 until we reach the end of the compilation unit. */
8652 /* Anonymous namespaces or modules have no name but have interesting
8653 children, so we need to look at them. Ditto for anonymous
8656 if (pdi->name != NULL || pdi->tag == DW_TAG_namespace
8657 || pdi->tag == DW_TAG_module || pdi->tag == DW_TAG_enumeration_type
8658 || pdi->tag == DW_TAG_imported_unit
8659 || pdi->tag == DW_TAG_inlined_subroutine)
8663 case DW_TAG_subprogram:
8664 case DW_TAG_inlined_subroutine:
8665 add_partial_subprogram (pdi, lowpc, highpc, set_addrmap, cu);
8667 case DW_TAG_constant:
8668 case DW_TAG_variable:
8669 case DW_TAG_typedef:
8670 case DW_TAG_union_type:
8671 if (!pdi->is_declaration)
8673 add_partial_symbol (pdi, cu);
8676 case DW_TAG_class_type:
8677 case DW_TAG_interface_type:
8678 case DW_TAG_structure_type:
8679 if (!pdi->is_declaration)
8681 add_partial_symbol (pdi, cu);
8683 if ((cu->language == language_rust
8684 || cu->language == language_cplus) && pdi->has_children)
8685 scan_partial_symbols (pdi->die_child, lowpc, highpc,
8688 case DW_TAG_enumeration_type:
8689 if (!pdi->is_declaration)
8690 add_partial_enumeration (pdi, cu);
8692 case DW_TAG_base_type:
8693 case DW_TAG_subrange_type:
8694 /* File scope base type definitions are added to the partial
8696 add_partial_symbol (pdi, cu);
8698 case DW_TAG_namespace:
8699 add_partial_namespace (pdi, lowpc, highpc, set_addrmap, cu);
8702 add_partial_module (pdi, lowpc, highpc, set_addrmap, cu);
8704 case DW_TAG_imported_unit:
8706 struct dwarf2_per_cu_data *per_cu;
8708 /* For now we don't handle imported units in type units. */
8709 if (cu->per_cu->is_debug_types)
8711 error (_("Dwarf Error: DW_TAG_imported_unit is not"
8712 " supported in type units [in module %s]"),
8713 objfile_name (cu->per_cu->dwarf2_per_objfile->objfile));
8716 per_cu = dwarf2_find_containing_comp_unit
8717 (pdi->d.sect_off, pdi->is_dwz,
8718 cu->per_cu->dwarf2_per_objfile);
8720 /* Go read the partial unit, if needed. */
8721 if (per_cu->v.psymtab == NULL)
8722 process_psymtab_comp_unit (per_cu, 1, cu->language);
8724 VEC_safe_push (dwarf2_per_cu_ptr,
8725 cu->per_cu->imported_symtabs, per_cu);
8728 case DW_TAG_imported_declaration:
8729 add_partial_symbol (pdi, cu);
8736 /* If the die has a sibling, skip to the sibling. */
8738 pdi = pdi->die_sibling;
8742 /* Functions used to compute the fully scoped name of a partial DIE.
8744 Normally, this is simple. For C++, the parent DIE's fully scoped
8745 name is concatenated with "::" and the partial DIE's name.
8746 Enumerators are an exception; they use the scope of their parent
8747 enumeration type, i.e. the name of the enumeration type is not
8748 prepended to the enumerator.
8750 There are two complexities. One is DW_AT_specification; in this
8751 case "parent" means the parent of the target of the specification,
8752 instead of the direct parent of the DIE. The other is compilers
8753 which do not emit DW_TAG_namespace; in this case we try to guess
8754 the fully qualified name of structure types from their members'
8755 linkage names. This must be done using the DIE's children rather
8756 than the children of any DW_AT_specification target. We only need
8757 to do this for structures at the top level, i.e. if the target of
8758 any DW_AT_specification (if any; otherwise the DIE itself) does not
8761 /* Compute the scope prefix associated with PDI's parent, in
8762 compilation unit CU. The result will be allocated on CU's
8763 comp_unit_obstack, or a copy of the already allocated PDI->NAME
8764 field. NULL is returned if no prefix is necessary. */
8766 partial_die_parent_scope (struct partial_die_info *pdi,
8767 struct dwarf2_cu *cu)
8769 const char *grandparent_scope;
8770 struct partial_die_info *parent, *real_pdi;
8772 /* We need to look at our parent DIE; if we have a DW_AT_specification,
8773 then this means the parent of the specification DIE. */
8776 while (real_pdi->has_specification)
8777 real_pdi = find_partial_die (real_pdi->spec_offset,
8778 real_pdi->spec_is_dwz, cu);
8780 parent = real_pdi->die_parent;
8784 if (parent->scope_set)
8785 return parent->scope;
8789 grandparent_scope = partial_die_parent_scope (parent, cu);
8791 /* GCC 4.0 and 4.1 had a bug (PR c++/28460) where they generated bogus
8792 DW_TAG_namespace DIEs with a name of "::" for the global namespace.
8793 Work around this problem here. */
8794 if (cu->language == language_cplus
8795 && parent->tag == DW_TAG_namespace
8796 && strcmp (parent->name, "::") == 0
8797 && grandparent_scope == NULL)
8799 parent->scope = NULL;
8800 parent->scope_set = 1;
8804 if (pdi->tag == DW_TAG_enumerator)
8805 /* Enumerators should not get the name of the enumeration as a prefix. */
8806 parent->scope = grandparent_scope;
8807 else if (parent->tag == DW_TAG_namespace
8808 || parent->tag == DW_TAG_module
8809 || parent->tag == DW_TAG_structure_type
8810 || parent->tag == DW_TAG_class_type
8811 || parent->tag == DW_TAG_interface_type
8812 || parent->tag == DW_TAG_union_type
8813 || parent->tag == DW_TAG_enumeration_type)
8815 if (grandparent_scope == NULL)
8816 parent->scope = parent->name;
8818 parent->scope = typename_concat (&cu->comp_unit_obstack,
8820 parent->name, 0, cu);
8824 /* FIXME drow/2004-04-01: What should we be doing with
8825 function-local names? For partial symbols, we should probably be
8827 complaint (_("unhandled containing DIE tag %d for DIE at %s"),
8828 parent->tag, sect_offset_str (pdi->sect_off));
8829 parent->scope = grandparent_scope;
8832 parent->scope_set = 1;
8833 return parent->scope;
8836 /* Return the fully scoped name associated with PDI, from compilation unit
8837 CU. The result will be allocated with malloc. */
8840 partial_die_full_name (struct partial_die_info *pdi,
8841 struct dwarf2_cu *cu)
8843 const char *parent_scope;
8845 /* If this is a template instantiation, we can not work out the
8846 template arguments from partial DIEs. So, unfortunately, we have
8847 to go through the full DIEs. At least any work we do building
8848 types here will be reused if full symbols are loaded later. */
8849 if (pdi->has_template_arguments)
8853 if (pdi->name != NULL && strchr (pdi->name, '<') == NULL)
8855 struct die_info *die;
8856 struct attribute attr;
8857 struct dwarf2_cu *ref_cu = cu;
8859 /* DW_FORM_ref_addr is using section offset. */
8860 attr.name = (enum dwarf_attribute) 0;
8861 attr.form = DW_FORM_ref_addr;
8862 attr.u.unsnd = to_underlying (pdi->sect_off);
8863 die = follow_die_ref (NULL, &attr, &ref_cu);
8865 return xstrdup (dwarf2_full_name (NULL, die, ref_cu));
8869 parent_scope = partial_die_parent_scope (pdi, cu);
8870 if (parent_scope == NULL)
8873 return typename_concat (NULL, parent_scope, pdi->name, 0, cu);
8877 add_partial_symbol (struct partial_die_info *pdi, struct dwarf2_cu *cu)
8879 struct dwarf2_per_objfile *dwarf2_per_objfile
8880 = cu->per_cu->dwarf2_per_objfile;
8881 struct objfile *objfile = dwarf2_per_objfile->objfile;
8882 struct gdbarch *gdbarch = get_objfile_arch (objfile);
8884 const char *actual_name = NULL;
8886 char *built_actual_name;
8888 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
8890 built_actual_name = partial_die_full_name (pdi, cu);
8891 if (built_actual_name != NULL)
8892 actual_name = built_actual_name;
8894 if (actual_name == NULL)
8895 actual_name = pdi->name;
8899 case DW_TAG_inlined_subroutine:
8900 case DW_TAG_subprogram:
8901 addr = (gdbarch_adjust_dwarf2_addr (gdbarch, pdi->lowpc + baseaddr)
8903 if (pdi->is_external || cu->language == language_ada)
8905 /* brobecker/2007-12-26: Normally, only "external" DIEs are part
8906 of the global scope. But in Ada, we want to be able to access
8907 nested procedures globally. So all Ada subprograms are stored
8908 in the global scope. */
8909 add_psymbol_to_list (actual_name, strlen (actual_name),
8910 built_actual_name != NULL,
8911 VAR_DOMAIN, LOC_BLOCK,
8912 SECT_OFF_TEXT (objfile),
8913 psymbol_placement::GLOBAL,
8915 cu->language, objfile);
8919 add_psymbol_to_list (actual_name, strlen (actual_name),
8920 built_actual_name != NULL,
8921 VAR_DOMAIN, LOC_BLOCK,
8922 SECT_OFF_TEXT (objfile),
8923 psymbol_placement::STATIC,
8924 addr, cu->language, objfile);
8927 if (pdi->main_subprogram && actual_name != NULL)
8928 set_objfile_main_name (objfile, actual_name, cu->language);
8930 case DW_TAG_constant:
8931 add_psymbol_to_list (actual_name, strlen (actual_name),
8932 built_actual_name != NULL, VAR_DOMAIN, LOC_STATIC,
8933 -1, (pdi->is_external
8934 ? psymbol_placement::GLOBAL
8935 : psymbol_placement::STATIC),
8936 0, cu->language, objfile);
8938 case DW_TAG_variable:
8940 addr = decode_locdesc (pdi->d.locdesc, cu);
8944 && !dwarf2_per_objfile->has_section_at_zero)
8946 /* A global or static variable may also have been stripped
8947 out by the linker if unused, in which case its address
8948 will be nullified; do not add such variables into partial
8949 symbol table then. */
8951 else if (pdi->is_external)
8954 Don't enter into the minimal symbol tables as there is
8955 a minimal symbol table entry from the ELF symbols already.
8956 Enter into partial symbol table if it has a location
8957 descriptor or a type.
8958 If the location descriptor is missing, new_symbol will create
8959 a LOC_UNRESOLVED symbol, the address of the variable will then
8960 be determined from the minimal symbol table whenever the variable
8962 The address for the partial symbol table entry is not
8963 used by GDB, but it comes in handy for debugging partial symbol
8966 if (pdi->d.locdesc || pdi->has_type)
8967 add_psymbol_to_list (actual_name, strlen (actual_name),
8968 built_actual_name != NULL,
8969 VAR_DOMAIN, LOC_STATIC,
8970 SECT_OFF_TEXT (objfile),
8971 psymbol_placement::GLOBAL,
8972 addr, cu->language, objfile);
8976 int has_loc = pdi->d.locdesc != NULL;
8978 /* Static Variable. Skip symbols whose value we cannot know (those
8979 without location descriptors or constant values). */
8980 if (!has_loc && !pdi->has_const_value)
8982 xfree (built_actual_name);
8986 add_psymbol_to_list (actual_name, strlen (actual_name),
8987 built_actual_name != NULL,
8988 VAR_DOMAIN, LOC_STATIC,
8989 SECT_OFF_TEXT (objfile),
8990 psymbol_placement::STATIC,
8992 cu->language, objfile);
8995 case DW_TAG_typedef:
8996 case DW_TAG_base_type:
8997 case DW_TAG_subrange_type:
8998 add_psymbol_to_list (actual_name, strlen (actual_name),
8999 built_actual_name != NULL,
9000 VAR_DOMAIN, LOC_TYPEDEF, -1,
9001 psymbol_placement::STATIC,
9002 0, cu->language, objfile);
9004 case DW_TAG_imported_declaration:
9005 case DW_TAG_namespace:
9006 add_psymbol_to_list (actual_name, strlen (actual_name),
9007 built_actual_name != NULL,
9008 VAR_DOMAIN, LOC_TYPEDEF, -1,
9009 psymbol_placement::GLOBAL,
9010 0, cu->language, objfile);
9013 add_psymbol_to_list (actual_name, strlen (actual_name),
9014 built_actual_name != NULL,
9015 MODULE_DOMAIN, LOC_TYPEDEF, -1,
9016 psymbol_placement::GLOBAL,
9017 0, cu->language, objfile);
9019 case DW_TAG_class_type:
9020 case DW_TAG_interface_type:
9021 case DW_TAG_structure_type:
9022 case DW_TAG_union_type:
9023 case DW_TAG_enumeration_type:
9024 /* Skip external references. The DWARF standard says in the section
9025 about "Structure, Union, and Class Type Entries": "An incomplete
9026 structure, union or class type is represented by a structure,
9027 union or class entry that does not have a byte size attribute
9028 and that has a DW_AT_declaration attribute." */
9029 if (!pdi->has_byte_size && pdi->is_declaration)
9031 xfree (built_actual_name);
9035 /* NOTE: carlton/2003-10-07: See comment in new_symbol about
9036 static vs. global. */
9037 add_psymbol_to_list (actual_name, strlen (actual_name),
9038 built_actual_name != NULL,
9039 STRUCT_DOMAIN, LOC_TYPEDEF, -1,
9040 cu->language == language_cplus
9041 ? psymbol_placement::GLOBAL
9042 : psymbol_placement::STATIC,
9043 0, cu->language, objfile);
9046 case DW_TAG_enumerator:
9047 add_psymbol_to_list (actual_name, strlen (actual_name),
9048 built_actual_name != NULL,
9049 VAR_DOMAIN, LOC_CONST, -1,
9050 cu->language == language_cplus
9051 ? psymbol_placement::GLOBAL
9052 : psymbol_placement::STATIC,
9053 0, cu->language, objfile);
9059 xfree (built_actual_name);
9062 /* Read a partial die corresponding to a namespace; also, add a symbol
9063 corresponding to that namespace to the symbol table. NAMESPACE is
9064 the name of the enclosing namespace. */
9067 add_partial_namespace (struct partial_die_info *pdi,
9068 CORE_ADDR *lowpc, CORE_ADDR *highpc,
9069 int set_addrmap, struct dwarf2_cu *cu)
9071 /* Add a symbol for the namespace. */
9073 add_partial_symbol (pdi, cu);
9075 /* Now scan partial symbols in that namespace. */
9077 if (pdi->has_children)
9078 scan_partial_symbols (pdi->die_child, lowpc, highpc, set_addrmap, cu);
9081 /* Read a partial die corresponding to a Fortran module. */
9084 add_partial_module (struct partial_die_info *pdi, CORE_ADDR *lowpc,
9085 CORE_ADDR *highpc, int set_addrmap, struct dwarf2_cu *cu)
9087 /* Add a symbol for the namespace. */
9089 add_partial_symbol (pdi, cu);
9091 /* Now scan partial symbols in that module. */
9093 if (pdi->has_children)
9094 scan_partial_symbols (pdi->die_child, lowpc, highpc, set_addrmap, cu);
9097 /* Read a partial die corresponding to a subprogram or an inlined
9098 subprogram and create a partial symbol for that subprogram.
9099 When the CU language allows it, this routine also defines a partial
9100 symbol for each nested subprogram that this subprogram contains.
9101 If SET_ADDRMAP is true, record the covered ranges in the addrmap.
9102 Set *LOWPC and *HIGHPC to the lowest and highest PC values found in PDI.
9104 PDI may also be a lexical block, in which case we simply search
9105 recursively for subprograms defined inside that lexical block.
9106 Again, this is only performed when the CU language allows this
9107 type of definitions. */
9110 add_partial_subprogram (struct partial_die_info *pdi,
9111 CORE_ADDR *lowpc, CORE_ADDR *highpc,
9112 int set_addrmap, struct dwarf2_cu *cu)
9114 if (pdi->tag == DW_TAG_subprogram || pdi->tag == DW_TAG_inlined_subroutine)
9116 if (pdi->has_pc_info)
9118 if (pdi->lowpc < *lowpc)
9119 *lowpc = pdi->lowpc;
9120 if (pdi->highpc > *highpc)
9121 *highpc = pdi->highpc;
9124 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
9125 struct gdbarch *gdbarch = get_objfile_arch (objfile);
9127 CORE_ADDR this_highpc;
9128 CORE_ADDR this_lowpc;
9130 baseaddr = ANOFFSET (objfile->section_offsets,
9131 SECT_OFF_TEXT (objfile));
9133 = (gdbarch_adjust_dwarf2_addr (gdbarch,
9134 pdi->lowpc + baseaddr)
9137 = (gdbarch_adjust_dwarf2_addr (gdbarch,
9138 pdi->highpc + baseaddr)
9140 addrmap_set_empty (objfile->partial_symtabs->psymtabs_addrmap,
9141 this_lowpc, this_highpc - 1,
9142 cu->per_cu->v.psymtab);
9146 if (pdi->has_pc_info || (!pdi->is_external && pdi->may_be_inlined))
9148 if (!pdi->is_declaration)
9149 /* Ignore subprogram DIEs that do not have a name, they are
9150 illegal. Do not emit a complaint at this point, we will
9151 do so when we convert this psymtab into a symtab. */
9153 add_partial_symbol (pdi, cu);
9157 if (! pdi->has_children)
9160 if (cu->language == language_ada)
9162 pdi = pdi->die_child;
9166 if (pdi->tag == DW_TAG_subprogram
9167 || pdi->tag == DW_TAG_inlined_subroutine
9168 || pdi->tag == DW_TAG_lexical_block)
9169 add_partial_subprogram (pdi, lowpc, highpc, set_addrmap, cu);
9170 pdi = pdi->die_sibling;
9175 /* Read a partial die corresponding to an enumeration type. */
9178 add_partial_enumeration (struct partial_die_info *enum_pdi,
9179 struct dwarf2_cu *cu)
9181 struct partial_die_info *pdi;
9183 if (enum_pdi->name != NULL)
9184 add_partial_symbol (enum_pdi, cu);
9186 pdi = enum_pdi->die_child;
9189 if (pdi->tag != DW_TAG_enumerator || pdi->name == NULL)
9190 complaint (_("malformed enumerator DIE ignored"));
9192 add_partial_symbol (pdi, cu);
9193 pdi = pdi->die_sibling;
9197 /* Return the initial uleb128 in the die at INFO_PTR. */
9200 peek_abbrev_code (bfd *abfd, const gdb_byte *info_ptr)
9202 unsigned int bytes_read;
9204 return read_unsigned_leb128 (abfd, info_ptr, &bytes_read);
9207 /* Read the initial uleb128 in the die at INFO_PTR in compilation unit
9208 READER::CU. Use READER::ABBREV_TABLE to lookup any abbreviation.
9210 Return the corresponding abbrev, or NULL if the number is zero (indicating
9211 an empty DIE). In either case *BYTES_READ will be set to the length of
9212 the initial number. */
9214 static struct abbrev_info *
9215 peek_die_abbrev (const die_reader_specs &reader,
9216 const gdb_byte *info_ptr, unsigned int *bytes_read)
9218 dwarf2_cu *cu = reader.cu;
9219 bfd *abfd = cu->per_cu->dwarf2_per_objfile->objfile->obfd;
9220 unsigned int abbrev_number
9221 = read_unsigned_leb128 (abfd, info_ptr, bytes_read);
9223 if (abbrev_number == 0)
9226 abbrev_info *abbrev = reader.abbrev_table->lookup_abbrev (abbrev_number);
9229 error (_("Dwarf Error: Could not find abbrev number %d in %s"
9230 " at offset %s [in module %s]"),
9231 abbrev_number, cu->per_cu->is_debug_types ? "TU" : "CU",
9232 sect_offset_str (cu->header.sect_off), bfd_get_filename (abfd));
9238 /* Scan the debug information for CU starting at INFO_PTR in buffer BUFFER.
9239 Returns a pointer to the end of a series of DIEs, terminated by an empty
9240 DIE. Any children of the skipped DIEs will also be skipped. */
9242 static const gdb_byte *
9243 skip_children (const struct die_reader_specs *reader, const gdb_byte *info_ptr)
9247 unsigned int bytes_read;
9248 abbrev_info *abbrev = peek_die_abbrev (*reader, info_ptr, &bytes_read);
9251 return info_ptr + bytes_read;
9253 info_ptr = skip_one_die (reader, info_ptr + bytes_read, abbrev);
9257 /* Scan the debug information for CU starting at INFO_PTR in buffer BUFFER.
9258 INFO_PTR should point just after the initial uleb128 of a DIE, and the
9259 abbrev corresponding to that skipped uleb128 should be passed in
9260 ABBREV. Returns a pointer to this DIE's sibling, skipping any
9263 static const gdb_byte *
9264 skip_one_die (const struct die_reader_specs *reader, const gdb_byte *info_ptr,
9265 struct abbrev_info *abbrev)
9267 unsigned int bytes_read;
9268 struct attribute attr;
9269 bfd *abfd = reader->abfd;
9270 struct dwarf2_cu *cu = reader->cu;
9271 const gdb_byte *buffer = reader->buffer;
9272 const gdb_byte *buffer_end = reader->buffer_end;
9273 unsigned int form, i;
9275 for (i = 0; i < abbrev->num_attrs; i++)
9277 /* The only abbrev we care about is DW_AT_sibling. */
9278 if (abbrev->attrs[i].name == DW_AT_sibling)
9280 read_attribute (reader, &attr, &abbrev->attrs[i], info_ptr);
9281 if (attr.form == DW_FORM_ref_addr)
9282 complaint (_("ignoring absolute DW_AT_sibling"));
9285 sect_offset off = dwarf2_get_ref_die_offset (&attr);
9286 const gdb_byte *sibling_ptr = buffer + to_underlying (off);
9288 if (sibling_ptr < info_ptr)
9289 complaint (_("DW_AT_sibling points backwards"));
9290 else if (sibling_ptr > reader->buffer_end)
9291 dwarf2_section_buffer_overflow_complaint (reader->die_section);
9297 /* If it isn't DW_AT_sibling, skip this attribute. */
9298 form = abbrev->attrs[i].form;
9302 case DW_FORM_ref_addr:
9303 /* In DWARF 2, DW_FORM_ref_addr is address sized; in DWARF 3
9304 and later it is offset sized. */
9305 if (cu->header.version == 2)
9306 info_ptr += cu->header.addr_size;
9308 info_ptr += cu->header.offset_size;
9310 case DW_FORM_GNU_ref_alt:
9311 info_ptr += cu->header.offset_size;
9314 info_ptr += cu->header.addr_size;
9321 case DW_FORM_flag_present:
9322 case DW_FORM_implicit_const:
9334 case DW_FORM_ref_sig8:
9337 case DW_FORM_data16:
9340 case DW_FORM_string:
9341 read_direct_string (abfd, info_ptr, &bytes_read);
9342 info_ptr += bytes_read;
9344 case DW_FORM_sec_offset:
9346 case DW_FORM_GNU_strp_alt:
9347 info_ptr += cu->header.offset_size;
9349 case DW_FORM_exprloc:
9351 info_ptr += read_unsigned_leb128 (abfd, info_ptr, &bytes_read);
9352 info_ptr += bytes_read;
9354 case DW_FORM_block1:
9355 info_ptr += 1 + read_1_byte (abfd, info_ptr);
9357 case DW_FORM_block2:
9358 info_ptr += 2 + read_2_bytes (abfd, info_ptr);
9360 case DW_FORM_block4:
9361 info_ptr += 4 + read_4_bytes (abfd, info_ptr);
9367 case DW_FORM_ref_udata:
9368 case DW_FORM_GNU_addr_index:
9369 case DW_FORM_GNU_str_index:
9370 info_ptr = safe_skip_leb128 (info_ptr, buffer_end);
9372 case DW_FORM_indirect:
9373 form = read_unsigned_leb128 (abfd, info_ptr, &bytes_read);
9374 info_ptr += bytes_read;
9375 /* We need to continue parsing from here, so just go back to
9377 goto skip_attribute;
9380 error (_("Dwarf Error: Cannot handle %s "
9381 "in DWARF reader [in module %s]"),
9382 dwarf_form_name (form),
9383 bfd_get_filename (abfd));
9387 if (abbrev->has_children)
9388 return skip_children (reader, info_ptr);
9393 /* Locate ORIG_PDI's sibling.
9394 INFO_PTR should point to the start of the next DIE after ORIG_PDI. */
9396 static const gdb_byte *
9397 locate_pdi_sibling (const struct die_reader_specs *reader,
9398 struct partial_die_info *orig_pdi,
9399 const gdb_byte *info_ptr)
9401 /* Do we know the sibling already? */
9403 if (orig_pdi->sibling)
9404 return orig_pdi->sibling;
9406 /* Are there any children to deal with? */
9408 if (!orig_pdi->has_children)
9411 /* Skip the children the long way. */
9413 return skip_children (reader, info_ptr);
9416 /* Expand this partial symbol table into a full symbol table. SELF is
9420 dwarf2_read_symtab (struct partial_symtab *self,
9421 struct objfile *objfile)
9423 struct dwarf2_per_objfile *dwarf2_per_objfile
9424 = get_dwarf2_per_objfile (objfile);
9428 warning (_("bug: psymtab for %s is already read in."),
9435 printf_filtered (_("Reading in symbols for %s..."),
9437 gdb_flush (gdb_stdout);
9440 /* If this psymtab is constructed from a debug-only objfile, the
9441 has_section_at_zero flag will not necessarily be correct. We
9442 can get the correct value for this flag by looking at the data
9443 associated with the (presumably stripped) associated objfile. */
9444 if (objfile->separate_debug_objfile_backlink)
9446 struct dwarf2_per_objfile *dpo_backlink
9447 = get_dwarf2_per_objfile (objfile->separate_debug_objfile_backlink);
9449 dwarf2_per_objfile->has_section_at_zero
9450 = dpo_backlink->has_section_at_zero;
9453 dwarf2_per_objfile->reading_partial_symbols = 0;
9455 psymtab_to_symtab_1 (self);
9457 /* Finish up the debug error message. */
9459 printf_filtered (_("done.\n"));
9462 process_cu_includes (dwarf2_per_objfile);
9465 /* Reading in full CUs. */
9467 /* Add PER_CU to the queue. */
9470 queue_comp_unit (struct dwarf2_per_cu_data *per_cu,
9471 enum language pretend_language)
9473 struct dwarf2_queue_item *item;
9476 item = XNEW (struct dwarf2_queue_item);
9477 item->per_cu = per_cu;
9478 item->pretend_language = pretend_language;
9481 if (dwarf2_queue == NULL)
9482 dwarf2_queue = item;
9484 dwarf2_queue_tail->next = item;
9486 dwarf2_queue_tail = item;
9489 /* If PER_CU is not yet queued, add it to the queue.
9490 If DEPENDENT_CU is non-NULL, it has a reference to PER_CU so add a
9492 The result is non-zero if PER_CU was queued, otherwise the result is zero
9493 meaning either PER_CU is already queued or it is already loaded.
9495 N.B. There is an invariant here that if a CU is queued then it is loaded.
9496 The caller is required to load PER_CU if we return non-zero. */
9499 maybe_queue_comp_unit (struct dwarf2_cu *dependent_cu,
9500 struct dwarf2_per_cu_data *per_cu,
9501 enum language pretend_language)
9503 /* We may arrive here during partial symbol reading, if we need full
9504 DIEs to process an unusual case (e.g. template arguments). Do
9505 not queue PER_CU, just tell our caller to load its DIEs. */
9506 if (per_cu->dwarf2_per_objfile->reading_partial_symbols)
9508 if (per_cu->cu == NULL || per_cu->cu->dies == NULL)
9513 /* Mark the dependence relation so that we don't flush PER_CU
9515 if (dependent_cu != NULL)
9516 dwarf2_add_dependence (dependent_cu, per_cu);
9518 /* If it's already on the queue, we have nothing to do. */
9522 /* If the compilation unit is already loaded, just mark it as
9524 if (per_cu->cu != NULL)
9526 per_cu->cu->last_used = 0;
9530 /* Add it to the queue. */
9531 queue_comp_unit (per_cu, pretend_language);
9536 /* Process the queue. */
9539 process_queue (struct dwarf2_per_objfile *dwarf2_per_objfile)
9541 struct dwarf2_queue_item *item, *next_item;
9543 if (dwarf_read_debug)
9545 fprintf_unfiltered (gdb_stdlog,
9546 "Expanding one or more symtabs of objfile %s ...\n",
9547 objfile_name (dwarf2_per_objfile->objfile));
9550 /* The queue starts out with one item, but following a DIE reference
9551 may load a new CU, adding it to the end of the queue. */
9552 for (item = dwarf2_queue; item != NULL; dwarf2_queue = item = next_item)
9554 if ((dwarf2_per_objfile->using_index
9555 ? !item->per_cu->v.quick->compunit_symtab
9556 : (item->per_cu->v.psymtab && !item->per_cu->v.psymtab->readin))
9557 /* Skip dummy CUs. */
9558 && item->per_cu->cu != NULL)
9560 struct dwarf2_per_cu_data *per_cu = item->per_cu;
9561 unsigned int debug_print_threshold;
9564 if (per_cu->is_debug_types)
9566 struct signatured_type *sig_type =
9567 (struct signatured_type *) per_cu;
9569 sprintf (buf, "TU %s at offset %s",
9570 hex_string (sig_type->signature),
9571 sect_offset_str (per_cu->sect_off));
9572 /* There can be 100s of TUs.
9573 Only print them in verbose mode. */
9574 debug_print_threshold = 2;
9578 sprintf (buf, "CU at offset %s",
9579 sect_offset_str (per_cu->sect_off));
9580 debug_print_threshold = 1;
9583 if (dwarf_read_debug >= debug_print_threshold)
9584 fprintf_unfiltered (gdb_stdlog, "Expanding symtab of %s\n", buf);
9586 if (per_cu->is_debug_types)
9587 process_full_type_unit (per_cu, item->pretend_language);
9589 process_full_comp_unit (per_cu, item->pretend_language);
9591 if (dwarf_read_debug >= debug_print_threshold)
9592 fprintf_unfiltered (gdb_stdlog, "Done expanding %s\n", buf);
9595 item->per_cu->queued = 0;
9596 next_item = item->next;
9600 dwarf2_queue_tail = NULL;
9602 if (dwarf_read_debug)
9604 fprintf_unfiltered (gdb_stdlog, "Done expanding symtabs of %s.\n",
9605 objfile_name (dwarf2_per_objfile->objfile));
9609 /* Read in full symbols for PST, and anything it depends on. */
9612 psymtab_to_symtab_1 (struct partial_symtab *pst)
9614 struct dwarf2_per_cu_data *per_cu;
9620 for (i = 0; i < pst->number_of_dependencies; i++)
9621 if (!pst->dependencies[i]->readin
9622 && pst->dependencies[i]->user == NULL)
9624 /* Inform about additional files that need to be read in. */
9627 /* FIXME: i18n: Need to make this a single string. */
9628 fputs_filtered (" ", gdb_stdout);
9630 fputs_filtered ("and ", gdb_stdout);
9632 printf_filtered ("%s...", pst->dependencies[i]->filename);
9633 wrap_here (""); /* Flush output. */
9634 gdb_flush (gdb_stdout);
9636 psymtab_to_symtab_1 (pst->dependencies[i]);
9639 per_cu = (struct dwarf2_per_cu_data *) pst->read_symtab_private;
9643 /* It's an include file, no symbols to read for it.
9644 Everything is in the parent symtab. */
9649 dw2_do_instantiate_symtab (per_cu, false);
9652 /* Trivial hash function for die_info: the hash value of a DIE
9653 is its offset in .debug_info for this objfile. */
9656 die_hash (const void *item)
9658 const struct die_info *die = (const struct die_info *) item;
9660 return to_underlying (die->sect_off);
9663 /* Trivial comparison function for die_info structures: two DIEs
9664 are equal if they have the same offset. */
9667 die_eq (const void *item_lhs, const void *item_rhs)
9669 const struct die_info *die_lhs = (const struct die_info *) item_lhs;
9670 const struct die_info *die_rhs = (const struct die_info *) item_rhs;
9672 return die_lhs->sect_off == die_rhs->sect_off;
9675 /* die_reader_func for load_full_comp_unit.
9676 This is identical to read_signatured_type_reader,
9677 but is kept separate for now. */
9680 load_full_comp_unit_reader (const struct die_reader_specs *reader,
9681 const gdb_byte *info_ptr,
9682 struct die_info *comp_unit_die,
9686 struct dwarf2_cu *cu = reader->cu;
9687 enum language *language_ptr = (enum language *) data;
9689 gdb_assert (cu->die_hash == NULL);
9691 htab_create_alloc_ex (cu->header.length / 12,
9695 &cu->comp_unit_obstack,
9696 hashtab_obstack_allocate,
9697 dummy_obstack_deallocate);
9700 comp_unit_die->child = read_die_and_siblings (reader, info_ptr,
9701 &info_ptr, comp_unit_die);
9702 cu->dies = comp_unit_die;
9703 /* comp_unit_die is not stored in die_hash, no need. */
9705 /* We try not to read any attributes in this function, because not
9706 all CUs needed for references have been loaded yet, and symbol
9707 table processing isn't initialized. But we have to set the CU language,
9708 or we won't be able to build types correctly.
9709 Similarly, if we do not read the producer, we can not apply
9710 producer-specific interpretation. */
9711 prepare_one_comp_unit (cu, cu->dies, *language_ptr);
9714 /* Load the DIEs associated with PER_CU into memory. */
9717 load_full_comp_unit (struct dwarf2_per_cu_data *this_cu,
9719 enum language pretend_language)
9721 gdb_assert (! this_cu->is_debug_types);
9723 init_cutu_and_read_dies (this_cu, NULL, 1, 1, skip_partial,
9724 load_full_comp_unit_reader, &pretend_language);
9727 /* Add a DIE to the delayed physname list. */
9730 add_to_method_list (struct type *type, int fnfield_index, int index,
9731 const char *name, struct die_info *die,
9732 struct dwarf2_cu *cu)
9734 struct delayed_method_info mi;
9736 mi.fnfield_index = fnfield_index;
9740 cu->method_list.push_back (mi);
9743 /* Check whether [PHYSNAME, PHYSNAME+LEN) ends with a modifier like
9744 "const" / "volatile". If so, decrements LEN by the length of the
9745 modifier and return true. Otherwise return false. */
9749 check_modifier (const char *physname, size_t &len, const char (&mod)[N])
9751 size_t mod_len = sizeof (mod) - 1;
9752 if (len > mod_len && startswith (physname + (len - mod_len), mod))
9760 /* Compute the physnames of any methods on the CU's method list.
9762 The computation of method physnames is delayed in order to avoid the
9763 (bad) condition that one of the method's formal parameters is of an as yet
9767 compute_delayed_physnames (struct dwarf2_cu *cu)
9769 /* Only C++ delays computing physnames. */
9770 if (cu->method_list.empty ())
9772 gdb_assert (cu->language == language_cplus);
9774 for (const delayed_method_info &mi : cu->method_list)
9776 const char *physname;
9777 struct fn_fieldlist *fn_flp
9778 = &TYPE_FN_FIELDLIST (mi.type, mi.fnfield_index);
9779 physname = dwarf2_physname (mi.name, mi.die, cu);
9780 TYPE_FN_FIELD_PHYSNAME (fn_flp->fn_fields, mi.index)
9781 = physname ? physname : "";
9783 /* Since there's no tag to indicate whether a method is a
9784 const/volatile overload, extract that information out of the
9786 if (physname != NULL)
9788 size_t len = strlen (physname);
9792 if (physname[len] == ')') /* shortcut */
9794 else if (check_modifier (physname, len, " const"))
9795 TYPE_FN_FIELD_CONST (fn_flp->fn_fields, mi.index) = 1;
9796 else if (check_modifier (physname, len, " volatile"))
9797 TYPE_FN_FIELD_VOLATILE (fn_flp->fn_fields, mi.index) = 1;
9804 /* The list is no longer needed. */
9805 cu->method_list.clear ();
9808 /* Go objects should be embedded in a DW_TAG_module DIE,
9809 and it's not clear if/how imported objects will appear.
9810 To keep Go support simple until that's worked out,
9811 go back through what we've read and create something usable.
9812 We could do this while processing each DIE, and feels kinda cleaner,
9813 but that way is more invasive.
9814 This is to, for example, allow the user to type "p var" or "b main"
9815 without having to specify the package name, and allow lookups
9816 of module.object to work in contexts that use the expression
9820 fixup_go_packaging (struct dwarf2_cu *cu)
9822 char *package_name = NULL;
9823 struct pending *list;
9826 for (list = *cu->get_builder ()->get_global_symbols ();
9830 for (i = 0; i < list->nsyms; ++i)
9832 struct symbol *sym = list->symbol[i];
9834 if (SYMBOL_LANGUAGE (sym) == language_go
9835 && SYMBOL_CLASS (sym) == LOC_BLOCK)
9837 char *this_package_name = go_symbol_package_name (sym);
9839 if (this_package_name == NULL)
9841 if (package_name == NULL)
9842 package_name = this_package_name;
9845 struct objfile *objfile
9846 = cu->per_cu->dwarf2_per_objfile->objfile;
9847 if (strcmp (package_name, this_package_name) != 0)
9848 complaint (_("Symtab %s has objects from two different Go packages: %s and %s"),
9849 (symbol_symtab (sym) != NULL
9850 ? symtab_to_filename_for_display
9851 (symbol_symtab (sym))
9852 : objfile_name (objfile)),
9853 this_package_name, package_name);
9854 xfree (this_package_name);
9860 if (package_name != NULL)
9862 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
9863 const char *saved_package_name
9864 = (const char *) obstack_copy0 (&objfile->per_bfd->storage_obstack,
9866 strlen (package_name));
9867 struct type *type = init_type (objfile, TYPE_CODE_MODULE, 0,
9868 saved_package_name);
9871 sym = allocate_symbol (objfile);
9872 SYMBOL_SET_LANGUAGE (sym, language_go, &objfile->objfile_obstack);
9873 SYMBOL_SET_NAMES (sym, saved_package_name,
9874 strlen (saved_package_name), 0, objfile);
9875 /* This is not VAR_DOMAIN because we want a way to ensure a lookup of,
9876 e.g., "main" finds the "main" module and not C's main(). */
9877 SYMBOL_DOMAIN (sym) = STRUCT_DOMAIN;
9878 SYMBOL_ACLASS_INDEX (sym) = LOC_TYPEDEF;
9879 SYMBOL_TYPE (sym) = type;
9881 add_symbol_to_list (sym, cu->get_builder ()->get_global_symbols ());
9883 xfree (package_name);
9887 /* Allocate a fully-qualified name consisting of the two parts on the
9891 rust_fully_qualify (struct obstack *obstack, const char *p1, const char *p2)
9893 return obconcat (obstack, p1, "::", p2, (char *) NULL);
9896 /* A helper that allocates a struct discriminant_info to attach to a
9899 static struct discriminant_info *
9900 alloc_discriminant_info (struct type *type, int discriminant_index,
9903 gdb_assert (TYPE_CODE (type) == TYPE_CODE_UNION);
9904 gdb_assert (discriminant_index == -1
9905 || (discriminant_index >= 0
9906 && discriminant_index < TYPE_NFIELDS (type)));
9907 gdb_assert (default_index == -1
9908 || (default_index >= 0 && default_index < TYPE_NFIELDS (type)));
9910 TYPE_FLAG_DISCRIMINATED_UNION (type) = 1;
9912 struct discriminant_info *disc
9913 = ((struct discriminant_info *)
9915 offsetof (struct discriminant_info, discriminants)
9916 + TYPE_NFIELDS (type) * sizeof (disc->discriminants[0])));
9917 disc->default_index = default_index;
9918 disc->discriminant_index = discriminant_index;
9920 struct dynamic_prop prop;
9921 prop.kind = PROP_UNDEFINED;
9922 prop.data.baton = disc;
9924 add_dyn_prop (DYN_PROP_DISCRIMINATED, prop, type);
9929 /* Some versions of rustc emitted enums in an unusual way.
9931 Ordinary enums were emitted as unions. The first element of each
9932 structure in the union was named "RUST$ENUM$DISR". This element
9933 held the discriminant.
9935 These versions of Rust also implemented the "non-zero"
9936 optimization. When the enum had two values, and one is empty and
9937 the other holds a pointer that cannot be zero, the pointer is used
9938 as the discriminant, with a zero value meaning the empty variant.
9939 Here, the union's first member is of the form
9940 RUST$ENCODED$ENUM$<fieldno>$<fieldno>$...$<variantname>
9941 where the fieldnos are the indices of the fields that should be
9942 traversed in order to find the field (which may be several fields deep)
9943 and the variantname is the name of the variant of the case when the
9946 This function recognizes whether TYPE is of one of these forms,
9947 and, if so, smashes it to be a variant type. */
9950 quirk_rust_enum (struct type *type, struct objfile *objfile)
9952 gdb_assert (TYPE_CODE (type) == TYPE_CODE_UNION);
9954 /* We don't need to deal with empty enums. */
9955 if (TYPE_NFIELDS (type) == 0)
9958 #define RUST_ENUM_PREFIX "RUST$ENCODED$ENUM$"
9959 if (TYPE_NFIELDS (type) == 1
9960 && startswith (TYPE_FIELD_NAME (type, 0), RUST_ENUM_PREFIX))
9962 const char *name = TYPE_FIELD_NAME (type, 0) + strlen (RUST_ENUM_PREFIX);
9964 /* Decode the field name to find the offset of the
9966 ULONGEST bit_offset = 0;
9967 struct type *field_type = TYPE_FIELD_TYPE (type, 0);
9968 while (name[0] >= '0' && name[0] <= '9')
9971 unsigned long index = strtoul (name, &tail, 10);
9974 || index >= TYPE_NFIELDS (field_type)
9975 || (TYPE_FIELD_LOC_KIND (field_type, index)
9976 != FIELD_LOC_KIND_BITPOS))
9978 complaint (_("Could not parse Rust enum encoding string \"%s\""
9980 TYPE_FIELD_NAME (type, 0),
9981 objfile_name (objfile));
9986 bit_offset += TYPE_FIELD_BITPOS (field_type, index);
9987 field_type = TYPE_FIELD_TYPE (field_type, index);
9990 /* Make a union to hold the variants. */
9991 struct type *union_type = alloc_type (objfile);
9992 TYPE_CODE (union_type) = TYPE_CODE_UNION;
9993 TYPE_NFIELDS (union_type) = 3;
9994 TYPE_FIELDS (union_type)
9995 = (struct field *) TYPE_ZALLOC (type, 3 * sizeof (struct field));
9996 TYPE_LENGTH (union_type) = TYPE_LENGTH (type);
9997 set_type_align (union_type, TYPE_RAW_ALIGN (type));
9999 /* Put the discriminant must at index 0. */
10000 TYPE_FIELD_TYPE (union_type, 0) = field_type;
10001 TYPE_FIELD_ARTIFICIAL (union_type, 0) = 1;
10002 TYPE_FIELD_NAME (union_type, 0) = "<<discriminant>>";
10003 SET_FIELD_BITPOS (TYPE_FIELD (union_type, 0), bit_offset);
10005 /* The order of fields doesn't really matter, so put the real
10006 field at index 1 and the data-less field at index 2. */
10007 struct discriminant_info *disc
10008 = alloc_discriminant_info (union_type, 0, 1);
10009 TYPE_FIELD (union_type, 1) = TYPE_FIELD (type, 0);
10010 TYPE_FIELD_NAME (union_type, 1)
10011 = rust_last_path_segment (TYPE_NAME (TYPE_FIELD_TYPE (union_type, 1)));
10012 TYPE_NAME (TYPE_FIELD_TYPE (union_type, 1))
10013 = rust_fully_qualify (&objfile->objfile_obstack, TYPE_NAME (type),
10014 TYPE_FIELD_NAME (union_type, 1));
10016 const char *dataless_name
10017 = rust_fully_qualify (&objfile->objfile_obstack, TYPE_NAME (type),
10019 struct type *dataless_type = init_type (objfile, TYPE_CODE_VOID, 0,
10021 TYPE_FIELD_TYPE (union_type, 2) = dataless_type;
10022 /* NAME points into the original discriminant name, which
10023 already has the correct lifetime. */
10024 TYPE_FIELD_NAME (union_type, 2) = name;
10025 SET_FIELD_BITPOS (TYPE_FIELD (union_type, 2), 0);
10026 disc->discriminants[2] = 0;
10028 /* Smash this type to be a structure type. We have to do this
10029 because the type has already been recorded. */
10030 TYPE_CODE (type) = TYPE_CODE_STRUCT;
10031 TYPE_NFIELDS (type) = 1;
10033 = (struct field *) TYPE_ZALLOC (type, sizeof (struct field));
10035 /* Install the variant part. */
10036 TYPE_FIELD_TYPE (type, 0) = union_type;
10037 SET_FIELD_BITPOS (TYPE_FIELD (type, 0), 0);
10038 TYPE_FIELD_NAME (type, 0) = "<<variants>>";
10040 else if (TYPE_NFIELDS (type) == 1)
10042 /* We assume that a union with a single field is a univariant
10044 /* Smash this type to be a structure type. We have to do this
10045 because the type has already been recorded. */
10046 TYPE_CODE (type) = TYPE_CODE_STRUCT;
10048 /* Make a union to hold the variants. */
10049 struct type *union_type = alloc_type (objfile);
10050 TYPE_CODE (union_type) = TYPE_CODE_UNION;
10051 TYPE_NFIELDS (union_type) = TYPE_NFIELDS (type);
10052 TYPE_LENGTH (union_type) = TYPE_LENGTH (type);
10053 set_type_align (union_type, TYPE_RAW_ALIGN (type));
10054 TYPE_FIELDS (union_type) = TYPE_FIELDS (type);
10056 struct type *field_type = TYPE_FIELD_TYPE (union_type, 0);
10057 const char *variant_name
10058 = rust_last_path_segment (TYPE_NAME (field_type));
10059 TYPE_FIELD_NAME (union_type, 0) = variant_name;
10060 TYPE_NAME (field_type)
10061 = rust_fully_qualify (&objfile->objfile_obstack,
10062 TYPE_NAME (type), variant_name);
10064 /* Install the union in the outer struct type. */
10065 TYPE_NFIELDS (type) = 1;
10067 = (struct field *) TYPE_ZALLOC (union_type, sizeof (struct field));
10068 TYPE_FIELD_TYPE (type, 0) = union_type;
10069 TYPE_FIELD_NAME (type, 0) = "<<variants>>";
10070 SET_FIELD_BITPOS (TYPE_FIELD (type, 0), 0);
10072 alloc_discriminant_info (union_type, -1, 0);
10076 struct type *disr_type = nullptr;
10077 for (int i = 0; i < TYPE_NFIELDS (type); ++i)
10079 disr_type = TYPE_FIELD_TYPE (type, i);
10081 if (TYPE_CODE (disr_type) != TYPE_CODE_STRUCT)
10083 /* All fields of a true enum will be structs. */
10086 else if (TYPE_NFIELDS (disr_type) == 0)
10088 /* Could be data-less variant, so keep going. */
10089 disr_type = nullptr;
10091 else if (strcmp (TYPE_FIELD_NAME (disr_type, 0),
10092 "RUST$ENUM$DISR") != 0)
10094 /* Not a Rust enum. */
10104 /* If we got here without a discriminant, then it's probably
10106 if (disr_type == nullptr)
10109 /* Smash this type to be a structure type. We have to do this
10110 because the type has already been recorded. */
10111 TYPE_CODE (type) = TYPE_CODE_STRUCT;
10113 /* Make a union to hold the variants. */
10114 struct field *disr_field = &TYPE_FIELD (disr_type, 0);
10115 struct type *union_type = alloc_type (objfile);
10116 TYPE_CODE (union_type) = TYPE_CODE_UNION;
10117 TYPE_NFIELDS (union_type) = 1 + TYPE_NFIELDS (type);
10118 TYPE_LENGTH (union_type) = TYPE_LENGTH (type);
10119 set_type_align (union_type, TYPE_RAW_ALIGN (type));
10120 TYPE_FIELDS (union_type)
10121 = (struct field *) TYPE_ZALLOC (union_type,
10122 (TYPE_NFIELDS (union_type)
10123 * sizeof (struct field)));
10125 memcpy (TYPE_FIELDS (union_type) + 1, TYPE_FIELDS (type),
10126 TYPE_NFIELDS (type) * sizeof (struct field));
10128 /* Install the discriminant at index 0 in the union. */
10129 TYPE_FIELD (union_type, 0) = *disr_field;
10130 TYPE_FIELD_ARTIFICIAL (union_type, 0) = 1;
10131 TYPE_FIELD_NAME (union_type, 0) = "<<discriminant>>";
10133 /* Install the union in the outer struct type. */
10134 TYPE_FIELD_TYPE (type, 0) = union_type;
10135 TYPE_FIELD_NAME (type, 0) = "<<variants>>";
10136 TYPE_NFIELDS (type) = 1;
10138 /* Set the size and offset of the union type. */
10139 SET_FIELD_BITPOS (TYPE_FIELD (type, 0), 0);
10141 /* We need a way to find the correct discriminant given a
10142 variant name. For convenience we build a map here. */
10143 struct type *enum_type = FIELD_TYPE (*disr_field);
10144 std::unordered_map<std::string, ULONGEST> discriminant_map;
10145 for (int i = 0; i < TYPE_NFIELDS (enum_type); ++i)
10147 if (TYPE_FIELD_LOC_KIND (enum_type, i) == FIELD_LOC_KIND_ENUMVAL)
10150 = rust_last_path_segment (TYPE_FIELD_NAME (enum_type, i));
10151 discriminant_map[name] = TYPE_FIELD_ENUMVAL (enum_type, i);
10155 int n_fields = TYPE_NFIELDS (union_type);
10156 struct discriminant_info *disc
10157 = alloc_discriminant_info (union_type, 0, -1);
10158 /* Skip the discriminant here. */
10159 for (int i = 1; i < n_fields; ++i)
10161 /* Find the final word in the name of this variant's type.
10162 That name can be used to look up the correct
10164 const char *variant_name
10165 = rust_last_path_segment (TYPE_NAME (TYPE_FIELD_TYPE (union_type,
10168 auto iter = discriminant_map.find (variant_name);
10169 if (iter != discriminant_map.end ())
10170 disc->discriminants[i] = iter->second;
10172 /* Remove the discriminant field, if it exists. */
10173 struct type *sub_type = TYPE_FIELD_TYPE (union_type, i);
10174 if (TYPE_NFIELDS (sub_type) > 0)
10176 --TYPE_NFIELDS (sub_type);
10177 ++TYPE_FIELDS (sub_type);
10179 TYPE_FIELD_NAME (union_type, i) = variant_name;
10180 TYPE_NAME (sub_type)
10181 = rust_fully_qualify (&objfile->objfile_obstack,
10182 TYPE_NAME (type), variant_name);
10187 /* Rewrite some Rust unions to be structures with variants parts. */
10190 rust_union_quirks (struct dwarf2_cu *cu)
10192 gdb_assert (cu->language == language_rust);
10193 for (type *type_ : cu->rust_unions)
10194 quirk_rust_enum (type_, cu->per_cu->dwarf2_per_objfile->objfile);
10195 /* We don't need this any more. */
10196 cu->rust_unions.clear ();
10199 /* Return the symtab for PER_CU. This works properly regardless of
10200 whether we're using the index or psymtabs. */
10202 static struct compunit_symtab *
10203 get_compunit_symtab (struct dwarf2_per_cu_data *per_cu)
10205 return (per_cu->dwarf2_per_objfile->using_index
10206 ? per_cu->v.quick->compunit_symtab
10207 : per_cu->v.psymtab->compunit_symtab);
10210 /* A helper function for computing the list of all symbol tables
10211 included by PER_CU. */
10214 recursively_compute_inclusions (std::vector<compunit_symtab *> *result,
10215 htab_t all_children, htab_t all_type_symtabs,
10216 struct dwarf2_per_cu_data *per_cu,
10217 struct compunit_symtab *immediate_parent)
10221 struct compunit_symtab *cust;
10222 struct dwarf2_per_cu_data *iter;
10224 slot = htab_find_slot (all_children, per_cu, INSERT);
10227 /* This inclusion and its children have been processed. */
10232 /* Only add a CU if it has a symbol table. */
10233 cust = get_compunit_symtab (per_cu);
10236 /* If this is a type unit only add its symbol table if we haven't
10237 seen it yet (type unit per_cu's can share symtabs). */
10238 if (per_cu->is_debug_types)
10240 slot = htab_find_slot (all_type_symtabs, cust, INSERT);
10244 result->push_back (cust);
10245 if (cust->user == NULL)
10246 cust->user = immediate_parent;
10251 result->push_back (cust);
10252 if (cust->user == NULL)
10253 cust->user = immediate_parent;
10258 VEC_iterate (dwarf2_per_cu_ptr, per_cu->imported_symtabs, ix, iter);
10261 recursively_compute_inclusions (result, all_children,
10262 all_type_symtabs, iter, cust);
10266 /* Compute the compunit_symtab 'includes' fields for the compunit_symtab of
10270 compute_compunit_symtab_includes (struct dwarf2_per_cu_data *per_cu)
10272 gdb_assert (! per_cu->is_debug_types);
10274 if (!VEC_empty (dwarf2_per_cu_ptr, per_cu->imported_symtabs))
10277 struct dwarf2_per_cu_data *per_cu_iter;
10278 std::vector<compunit_symtab *> result_symtabs;
10279 htab_t all_children, all_type_symtabs;
10280 struct compunit_symtab *cust = get_compunit_symtab (per_cu);
10282 /* If we don't have a symtab, we can just skip this case. */
10286 all_children = htab_create_alloc (1, htab_hash_pointer, htab_eq_pointer,
10287 NULL, xcalloc, xfree);
10288 all_type_symtabs = htab_create_alloc (1, htab_hash_pointer, htab_eq_pointer,
10289 NULL, xcalloc, xfree);
10292 VEC_iterate (dwarf2_per_cu_ptr, per_cu->imported_symtabs,
10296 recursively_compute_inclusions (&result_symtabs, all_children,
10297 all_type_symtabs, per_cu_iter,
10301 /* Now we have a transitive closure of all the included symtabs. */
10302 len = result_symtabs.size ();
10304 = XOBNEWVEC (&per_cu->dwarf2_per_objfile->objfile->objfile_obstack,
10305 struct compunit_symtab *, len + 1);
10306 memcpy (cust->includes, result_symtabs.data (),
10307 len * sizeof (compunit_symtab *));
10308 cust->includes[len] = NULL;
10310 htab_delete (all_children);
10311 htab_delete (all_type_symtabs);
10315 /* Compute the 'includes' field for the symtabs of all the CUs we just
10319 process_cu_includes (struct dwarf2_per_objfile *dwarf2_per_objfile)
10321 for (dwarf2_per_cu_data *iter : dwarf2_per_objfile->just_read_cus)
10323 if (! iter->is_debug_types)
10324 compute_compunit_symtab_includes (iter);
10327 dwarf2_per_objfile->just_read_cus.clear ();
10330 /* Generate full symbol information for PER_CU, whose DIEs have
10331 already been loaded into memory. */
10334 process_full_comp_unit (struct dwarf2_per_cu_data *per_cu,
10335 enum language pretend_language)
10337 struct dwarf2_cu *cu = per_cu->cu;
10338 struct dwarf2_per_objfile *dwarf2_per_objfile = per_cu->dwarf2_per_objfile;
10339 struct objfile *objfile = dwarf2_per_objfile->objfile;
10340 struct gdbarch *gdbarch = get_objfile_arch (objfile);
10341 CORE_ADDR lowpc, highpc;
10342 struct compunit_symtab *cust;
10343 CORE_ADDR baseaddr;
10344 struct block *static_block;
10347 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
10349 /* Clear the list here in case something was left over. */
10350 cu->method_list.clear ();
10352 cu->language = pretend_language;
10353 cu->language_defn = language_def (cu->language);
10355 /* Do line number decoding in read_file_scope () */
10356 process_die (cu->dies, cu);
10358 /* For now fudge the Go package. */
10359 if (cu->language == language_go)
10360 fixup_go_packaging (cu);
10362 /* Now that we have processed all the DIEs in the CU, all the types
10363 should be complete, and it should now be safe to compute all of the
10365 compute_delayed_physnames (cu);
10367 if (cu->language == language_rust)
10368 rust_union_quirks (cu);
10370 /* Some compilers don't define a DW_AT_high_pc attribute for the
10371 compilation unit. If the DW_AT_high_pc is missing, synthesize
10372 it, by scanning the DIE's below the compilation unit. */
10373 get_scope_pc_bounds (cu->dies, &lowpc, &highpc, cu);
10375 addr = gdbarch_adjust_dwarf2_addr (gdbarch, highpc + baseaddr);
10376 static_block = cu->get_builder ()->end_symtab_get_static_block (addr, 0, 1);
10378 /* If the comp unit has DW_AT_ranges, it may have discontiguous ranges.
10379 Also, DW_AT_ranges may record ranges not belonging to any child DIEs
10380 (such as virtual method tables). Record the ranges in STATIC_BLOCK's
10381 addrmap to help ensure it has an accurate map of pc values belonging to
10383 dwarf2_record_block_ranges (cu->dies, static_block, baseaddr, cu);
10385 cust = cu->get_builder ()->end_symtab_from_static_block (static_block,
10386 SECT_OFF_TEXT (objfile),
10391 int gcc_4_minor = producer_is_gcc_ge_4 (cu->producer);
10393 /* Set symtab language to language from DW_AT_language. If the
10394 compilation is from a C file generated by language preprocessors, do
10395 not set the language if it was already deduced by start_subfile. */
10396 if (!(cu->language == language_c
10397 && COMPUNIT_FILETABS (cust)->language != language_unknown))
10398 COMPUNIT_FILETABS (cust)->language = cu->language;
10400 /* GCC-4.0 has started to support -fvar-tracking. GCC-3.x still can
10401 produce DW_AT_location with location lists but it can be possibly
10402 invalid without -fvar-tracking. Still up to GCC-4.4.x incl. 4.4.0
10403 there were bugs in prologue debug info, fixed later in GCC-4.5
10404 by "unwind info for epilogues" patch (which is not directly related).
10406 For -gdwarf-4 type units LOCATIONS_VALID indication is fortunately not
10407 needed, it would be wrong due to missing DW_AT_producer there.
10409 Still one can confuse GDB by using non-standard GCC compilation
10410 options - this waits on GCC PR other/32998 (-frecord-gcc-switches).
10412 if (cu->has_loclist && gcc_4_minor >= 5)
10413 cust->locations_valid = 1;
10415 if (gcc_4_minor >= 5)
10416 cust->epilogue_unwind_valid = 1;
10418 cust->call_site_htab = cu->call_site_htab;
10421 if (dwarf2_per_objfile->using_index)
10422 per_cu->v.quick->compunit_symtab = cust;
10425 struct partial_symtab *pst = per_cu->v.psymtab;
10426 pst->compunit_symtab = cust;
10430 /* Push it for inclusion processing later. */
10431 dwarf2_per_objfile->just_read_cus.push_back (per_cu);
10433 /* Not needed any more. */
10434 cu->reset_builder ();
10437 /* Generate full symbol information for type unit PER_CU, whose DIEs have
10438 already been loaded into memory. */
10441 process_full_type_unit (struct dwarf2_per_cu_data *per_cu,
10442 enum language pretend_language)
10444 struct dwarf2_cu *cu = per_cu->cu;
10445 struct dwarf2_per_objfile *dwarf2_per_objfile = per_cu->dwarf2_per_objfile;
10446 struct objfile *objfile = dwarf2_per_objfile->objfile;
10447 struct compunit_symtab *cust;
10448 struct signatured_type *sig_type;
10450 gdb_assert (per_cu->is_debug_types);
10451 sig_type = (struct signatured_type *) per_cu;
10453 /* Clear the list here in case something was left over. */
10454 cu->method_list.clear ();
10456 cu->language = pretend_language;
10457 cu->language_defn = language_def (cu->language);
10459 /* The symbol tables are set up in read_type_unit_scope. */
10460 process_die (cu->dies, cu);
10462 /* For now fudge the Go package. */
10463 if (cu->language == language_go)
10464 fixup_go_packaging (cu);
10466 /* Now that we have processed all the DIEs in the CU, all the types
10467 should be complete, and it should now be safe to compute all of the
10469 compute_delayed_physnames (cu);
10471 if (cu->language == language_rust)
10472 rust_union_quirks (cu);
10474 /* TUs share symbol tables.
10475 If this is the first TU to use this symtab, complete the construction
10476 of it with end_expandable_symtab. Otherwise, complete the addition of
10477 this TU's symbols to the existing symtab. */
10478 if (sig_type->type_unit_group->compunit_symtab == NULL)
10480 buildsym_compunit *builder = cu->get_builder ();
10481 cust = builder->end_expandable_symtab (0, SECT_OFF_TEXT (objfile));
10482 sig_type->type_unit_group->compunit_symtab = cust;
10486 /* Set symtab language to language from DW_AT_language. If the
10487 compilation is from a C file generated by language preprocessors,
10488 do not set the language if it was already deduced by
10490 if (!(cu->language == language_c
10491 && COMPUNIT_FILETABS (cust)->language != language_c))
10492 COMPUNIT_FILETABS (cust)->language = cu->language;
10497 cu->get_builder ()->augment_type_symtab ();
10498 cust = sig_type->type_unit_group->compunit_symtab;
10501 if (dwarf2_per_objfile->using_index)
10502 per_cu->v.quick->compunit_symtab = cust;
10505 struct partial_symtab *pst = per_cu->v.psymtab;
10506 pst->compunit_symtab = cust;
10510 /* Not needed any more. */
10511 cu->reset_builder ();
10514 /* Process an imported unit DIE. */
10517 process_imported_unit_die (struct die_info *die, struct dwarf2_cu *cu)
10519 struct attribute *attr;
10521 /* For now we don't handle imported units in type units. */
10522 if (cu->per_cu->is_debug_types)
10524 error (_("Dwarf Error: DW_TAG_imported_unit is not"
10525 " supported in type units [in module %s]"),
10526 objfile_name (cu->per_cu->dwarf2_per_objfile->objfile));
10529 attr = dwarf2_attr (die, DW_AT_import, cu);
10532 sect_offset sect_off = dwarf2_get_ref_die_offset (attr);
10533 bool is_dwz = (attr->form == DW_FORM_GNU_ref_alt || cu->per_cu->is_dwz);
10534 dwarf2_per_cu_data *per_cu
10535 = dwarf2_find_containing_comp_unit (sect_off, is_dwz,
10536 cu->per_cu->dwarf2_per_objfile);
10538 /* If necessary, add it to the queue and load its DIEs. */
10539 if (maybe_queue_comp_unit (cu, per_cu, cu->language))
10540 load_full_comp_unit (per_cu, false, cu->language);
10542 VEC_safe_push (dwarf2_per_cu_ptr, cu->per_cu->imported_symtabs,
10547 /* RAII object that represents a process_die scope: i.e.,
10548 starts/finishes processing a DIE. */
10549 class process_die_scope
10552 process_die_scope (die_info *die, dwarf2_cu *cu)
10553 : m_die (die), m_cu (cu)
10555 /* We should only be processing DIEs not already in process. */
10556 gdb_assert (!m_die->in_process);
10557 m_die->in_process = true;
10560 ~process_die_scope ()
10562 m_die->in_process = false;
10564 /* If we're done processing the DIE for the CU that owns the line
10565 header, we don't need the line header anymore. */
10566 if (m_cu->line_header_die_owner == m_die)
10568 delete m_cu->line_header;
10569 m_cu->line_header = NULL;
10570 m_cu->line_header_die_owner = NULL;
10579 /* Process a die and its children. */
10582 process_die (struct die_info *die, struct dwarf2_cu *cu)
10584 process_die_scope scope (die, cu);
10588 case DW_TAG_padding:
10590 case DW_TAG_compile_unit:
10591 case DW_TAG_partial_unit:
10592 read_file_scope (die, cu);
10594 case DW_TAG_type_unit:
10595 read_type_unit_scope (die, cu);
10597 case DW_TAG_subprogram:
10598 case DW_TAG_inlined_subroutine:
10599 read_func_scope (die, cu);
10601 case DW_TAG_lexical_block:
10602 case DW_TAG_try_block:
10603 case DW_TAG_catch_block:
10604 read_lexical_block_scope (die, cu);
10606 case DW_TAG_call_site:
10607 case DW_TAG_GNU_call_site:
10608 read_call_site_scope (die, cu);
10610 case DW_TAG_class_type:
10611 case DW_TAG_interface_type:
10612 case DW_TAG_structure_type:
10613 case DW_TAG_union_type:
10614 process_structure_scope (die, cu);
10616 case DW_TAG_enumeration_type:
10617 process_enumeration_scope (die, cu);
10620 /* These dies have a type, but processing them does not create
10621 a symbol or recurse to process the children. Therefore we can
10622 read them on-demand through read_type_die. */
10623 case DW_TAG_subroutine_type:
10624 case DW_TAG_set_type:
10625 case DW_TAG_array_type:
10626 case DW_TAG_pointer_type:
10627 case DW_TAG_ptr_to_member_type:
10628 case DW_TAG_reference_type:
10629 case DW_TAG_rvalue_reference_type:
10630 case DW_TAG_string_type:
10633 case DW_TAG_base_type:
10634 case DW_TAG_subrange_type:
10635 case DW_TAG_typedef:
10636 /* Add a typedef symbol for the type definition, if it has a
10638 new_symbol (die, read_type_die (die, cu), cu);
10640 case DW_TAG_common_block:
10641 read_common_block (die, cu);
10643 case DW_TAG_common_inclusion:
10645 case DW_TAG_namespace:
10646 cu->processing_has_namespace_info = true;
10647 read_namespace (die, cu);
10649 case DW_TAG_module:
10650 cu->processing_has_namespace_info = true;
10651 read_module (die, cu);
10653 case DW_TAG_imported_declaration:
10654 cu->processing_has_namespace_info = true;
10655 if (read_namespace_alias (die, cu))
10657 /* The declaration is not a global namespace alias. */
10658 /* Fall through. */
10659 case DW_TAG_imported_module:
10660 cu->processing_has_namespace_info = true;
10661 if (die->child != NULL && (die->tag == DW_TAG_imported_declaration
10662 || cu->language != language_fortran))
10663 complaint (_("Tag '%s' has unexpected children"),
10664 dwarf_tag_name (die->tag));
10665 read_import_statement (die, cu);
10668 case DW_TAG_imported_unit:
10669 process_imported_unit_die (die, cu);
10672 case DW_TAG_variable:
10673 read_variable (die, cu);
10677 new_symbol (die, NULL, cu);
10682 /* DWARF name computation. */
10684 /* A helper function for dwarf2_compute_name which determines whether DIE
10685 needs to have the name of the scope prepended to the name listed in the
10689 die_needs_namespace (struct die_info *die, struct dwarf2_cu *cu)
10691 struct attribute *attr;
10695 case DW_TAG_namespace:
10696 case DW_TAG_typedef:
10697 case DW_TAG_class_type:
10698 case DW_TAG_interface_type:
10699 case DW_TAG_structure_type:
10700 case DW_TAG_union_type:
10701 case DW_TAG_enumeration_type:
10702 case DW_TAG_enumerator:
10703 case DW_TAG_subprogram:
10704 case DW_TAG_inlined_subroutine:
10705 case DW_TAG_member:
10706 case DW_TAG_imported_declaration:
10709 case DW_TAG_variable:
10710 case DW_TAG_constant:
10711 /* We only need to prefix "globally" visible variables. These include
10712 any variable marked with DW_AT_external or any variable that
10713 lives in a namespace. [Variables in anonymous namespaces
10714 require prefixing, but they are not DW_AT_external.] */
10716 if (dwarf2_attr (die, DW_AT_specification, cu))
10718 struct dwarf2_cu *spec_cu = cu;
10720 return die_needs_namespace (die_specification (die, &spec_cu),
10724 attr = dwarf2_attr (die, DW_AT_external, cu);
10725 if (attr == NULL && die->parent->tag != DW_TAG_namespace
10726 && die->parent->tag != DW_TAG_module)
10728 /* A variable in a lexical block of some kind does not need a
10729 namespace, even though in C++ such variables may be external
10730 and have a mangled name. */
10731 if (die->parent->tag == DW_TAG_lexical_block
10732 || die->parent->tag == DW_TAG_try_block
10733 || die->parent->tag == DW_TAG_catch_block
10734 || die->parent->tag == DW_TAG_subprogram)
10743 /* Return the DIE's linkage name attribute, either DW_AT_linkage_name
10744 or DW_AT_MIPS_linkage_name. Returns NULL if the attribute is not
10745 defined for the given DIE. */
10747 static struct attribute *
10748 dw2_linkage_name_attr (struct die_info *die, struct dwarf2_cu *cu)
10750 struct attribute *attr;
10752 attr = dwarf2_attr (die, DW_AT_linkage_name, cu);
10754 attr = dwarf2_attr (die, DW_AT_MIPS_linkage_name, cu);
10759 /* Return the DIE's linkage name as a string, either DW_AT_linkage_name
10760 or DW_AT_MIPS_linkage_name. Returns NULL if the attribute is not
10761 defined for the given DIE. */
10763 static const char *
10764 dw2_linkage_name (struct die_info *die, struct dwarf2_cu *cu)
10766 const char *linkage_name;
10768 linkage_name = dwarf2_string_attr (die, DW_AT_linkage_name, cu);
10769 if (linkage_name == NULL)
10770 linkage_name = dwarf2_string_attr (die, DW_AT_MIPS_linkage_name, cu);
10772 return linkage_name;
10775 /* Compute the fully qualified name of DIE in CU. If PHYSNAME is nonzero,
10776 compute the physname for the object, which include a method's:
10777 - formal parameters (C++),
10778 - receiver type (Go),
10780 The term "physname" is a bit confusing.
10781 For C++, for example, it is the demangled name.
10782 For Go, for example, it's the mangled name.
10784 For Ada, return the DIE's linkage name rather than the fully qualified
10785 name. PHYSNAME is ignored..
10787 The result is allocated on the objfile_obstack and canonicalized. */
10789 static const char *
10790 dwarf2_compute_name (const char *name,
10791 struct die_info *die, struct dwarf2_cu *cu,
10794 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
10797 name = dwarf2_name (die, cu);
10799 /* For Fortran GDB prefers DW_AT_*linkage_name for the physname if present
10800 but otherwise compute it by typename_concat inside GDB.
10801 FIXME: Actually this is not really true, or at least not always true.
10802 It's all very confusing. SYMBOL_SET_NAMES doesn't try to demangle
10803 Fortran names because there is no mangling standard. So new_symbol
10804 will set the demangled name to the result of dwarf2_full_name, and it is
10805 the demangled name that GDB uses if it exists. */
10806 if (cu->language == language_ada
10807 || (cu->language == language_fortran && physname))
10809 /* For Ada unit, we prefer the linkage name over the name, as
10810 the former contains the exported name, which the user expects
10811 to be able to reference. Ideally, we want the user to be able
10812 to reference this entity using either natural or linkage name,
10813 but we haven't started looking at this enhancement yet. */
10814 const char *linkage_name = dw2_linkage_name (die, cu);
10816 if (linkage_name != NULL)
10817 return linkage_name;
10820 /* These are the only languages we know how to qualify names in. */
10822 && (cu->language == language_cplus
10823 || cu->language == language_fortran || cu->language == language_d
10824 || cu->language == language_rust))
10826 if (die_needs_namespace (die, cu))
10828 const char *prefix;
10829 const char *canonical_name = NULL;
10833 prefix = determine_prefix (die, cu);
10834 if (*prefix != '\0')
10836 char *prefixed_name = typename_concat (NULL, prefix, name,
10839 buf.puts (prefixed_name);
10840 xfree (prefixed_name);
10845 /* Template parameters may be specified in the DIE's DW_AT_name, or
10846 as children with DW_TAG_template_type_param or
10847 DW_TAG_value_type_param. If the latter, add them to the name
10848 here. If the name already has template parameters, then
10849 skip this step; some versions of GCC emit both, and
10850 it is more efficient to use the pre-computed name.
10852 Something to keep in mind about this process: it is very
10853 unlikely, or in some cases downright impossible, to produce
10854 something that will match the mangled name of a function.
10855 If the definition of the function has the same debug info,
10856 we should be able to match up with it anyway. But fallbacks
10857 using the minimal symbol, for instance to find a method
10858 implemented in a stripped copy of libstdc++, will not work.
10859 If we do not have debug info for the definition, we will have to
10860 match them up some other way.
10862 When we do name matching there is a related problem with function
10863 templates; two instantiated function templates are allowed to
10864 differ only by their return types, which we do not add here. */
10866 if (cu->language == language_cplus && strchr (name, '<') == NULL)
10868 struct attribute *attr;
10869 struct die_info *child;
10872 die->building_fullname = 1;
10874 for (child = die->child; child != NULL; child = child->sibling)
10878 const gdb_byte *bytes;
10879 struct dwarf2_locexpr_baton *baton;
10882 if (child->tag != DW_TAG_template_type_param
10883 && child->tag != DW_TAG_template_value_param)
10894 attr = dwarf2_attr (child, DW_AT_type, cu);
10897 complaint (_("template parameter missing DW_AT_type"));
10898 buf.puts ("UNKNOWN_TYPE");
10901 type = die_type (child, cu);
10903 if (child->tag == DW_TAG_template_type_param)
10905 c_print_type (type, "", &buf, -1, 0, cu->language,
10906 &type_print_raw_options);
10910 attr = dwarf2_attr (child, DW_AT_const_value, cu);
10913 complaint (_("template parameter missing "
10914 "DW_AT_const_value"));
10915 buf.puts ("UNKNOWN_VALUE");
10919 dwarf2_const_value_attr (attr, type, name,
10920 &cu->comp_unit_obstack, cu,
10921 &value, &bytes, &baton);
10923 if (TYPE_NOSIGN (type))
10924 /* GDB prints characters as NUMBER 'CHAR'. If that's
10925 changed, this can use value_print instead. */
10926 c_printchar (value, type, &buf);
10929 struct value_print_options opts;
10932 v = dwarf2_evaluate_loc_desc (type, NULL,
10936 else if (bytes != NULL)
10938 v = allocate_value (type);
10939 memcpy (value_contents_writeable (v), bytes,
10940 TYPE_LENGTH (type));
10943 v = value_from_longest (type, value);
10945 /* Specify decimal so that we do not depend on
10947 get_formatted_print_options (&opts, 'd');
10949 value_print (v, &buf, &opts);
10954 die->building_fullname = 0;
10958 /* Close the argument list, with a space if necessary
10959 (nested templates). */
10960 if (!buf.empty () && buf.string ().back () == '>')
10967 /* For C++ methods, append formal parameter type
10968 information, if PHYSNAME. */
10970 if (physname && die->tag == DW_TAG_subprogram
10971 && cu->language == language_cplus)
10973 struct type *type = read_type_die (die, cu);
10975 c_type_print_args (type, &buf, 1, cu->language,
10976 &type_print_raw_options);
10978 if (cu->language == language_cplus)
10980 /* Assume that an artificial first parameter is
10981 "this", but do not crash if it is not. RealView
10982 marks unnamed (and thus unused) parameters as
10983 artificial; there is no way to differentiate
10985 if (TYPE_NFIELDS (type) > 0
10986 && TYPE_FIELD_ARTIFICIAL (type, 0)
10987 && TYPE_CODE (TYPE_FIELD_TYPE (type, 0)) == TYPE_CODE_PTR
10988 && TYPE_CONST (TYPE_TARGET_TYPE (TYPE_FIELD_TYPE (type,
10990 buf.puts (" const");
10994 const std::string &intermediate_name = buf.string ();
10996 if (cu->language == language_cplus)
10998 = dwarf2_canonicalize_name (intermediate_name.c_str (), cu,
10999 &objfile->per_bfd->storage_obstack);
11001 /* If we only computed INTERMEDIATE_NAME, or if
11002 INTERMEDIATE_NAME is already canonical, then we need to
11003 copy it to the appropriate obstack. */
11004 if (canonical_name == NULL || canonical_name == intermediate_name.c_str ())
11005 name = ((const char *)
11006 obstack_copy0 (&objfile->per_bfd->storage_obstack,
11007 intermediate_name.c_str (),
11008 intermediate_name.length ()));
11010 name = canonical_name;
11017 /* Return the fully qualified name of DIE, based on its DW_AT_name.
11018 If scope qualifiers are appropriate they will be added. The result
11019 will be allocated on the storage_obstack, or NULL if the DIE does
11020 not have a name. NAME may either be from a previous call to
11021 dwarf2_name or NULL.
11023 The output string will be canonicalized (if C++). */
11025 static const char *
11026 dwarf2_full_name (const char *name, struct die_info *die, struct dwarf2_cu *cu)
11028 return dwarf2_compute_name (name, die, cu, 0);
11031 /* Construct a physname for the given DIE in CU. NAME may either be
11032 from a previous call to dwarf2_name or NULL. The result will be
11033 allocated on the objfile_objstack or NULL if the DIE does not have a
11036 The output string will be canonicalized (if C++). */
11038 static const char *
11039 dwarf2_physname (const char *name, struct die_info *die, struct dwarf2_cu *cu)
11041 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
11042 const char *retval, *mangled = NULL, *canon = NULL;
11045 /* In this case dwarf2_compute_name is just a shortcut not building anything
11047 if (!die_needs_namespace (die, cu))
11048 return dwarf2_compute_name (name, die, cu, 1);
11050 mangled = dw2_linkage_name (die, cu);
11052 /* rustc emits invalid values for DW_AT_linkage_name. Ignore these.
11053 See https://github.com/rust-lang/rust/issues/32925. */
11054 if (cu->language == language_rust && mangled != NULL
11055 && strchr (mangled, '{') != NULL)
11058 /* DW_AT_linkage_name is missing in some cases - depend on what GDB
11060 gdb::unique_xmalloc_ptr<char> demangled;
11061 if (mangled != NULL)
11064 if (language_def (cu->language)->la_store_sym_names_in_linkage_form_p)
11066 /* Do nothing (do not demangle the symbol name). */
11068 else if (cu->language == language_go)
11070 /* This is a lie, but we already lie to the caller new_symbol.
11071 new_symbol assumes we return the mangled name.
11072 This just undoes that lie until things are cleaned up. */
11076 /* Use DMGL_RET_DROP for C++ template functions to suppress
11077 their return type. It is easier for GDB users to search
11078 for such functions as `name(params)' than `long name(params)'.
11079 In such case the minimal symbol names do not match the full
11080 symbol names but for template functions there is never a need
11081 to look up their definition from their declaration so
11082 the only disadvantage remains the minimal symbol variant
11083 `long name(params)' does not have the proper inferior type. */
11084 demangled.reset (gdb_demangle (mangled,
11085 (DMGL_PARAMS | DMGL_ANSI
11086 | DMGL_RET_DROP)));
11089 canon = demangled.get ();
11097 if (canon == NULL || check_physname)
11099 const char *physname = dwarf2_compute_name (name, die, cu, 1);
11101 if (canon != NULL && strcmp (physname, canon) != 0)
11103 /* It may not mean a bug in GDB. The compiler could also
11104 compute DW_AT_linkage_name incorrectly. But in such case
11105 GDB would need to be bug-to-bug compatible. */
11107 complaint (_("Computed physname <%s> does not match demangled <%s> "
11108 "(from linkage <%s>) - DIE at %s [in module %s]"),
11109 physname, canon, mangled, sect_offset_str (die->sect_off),
11110 objfile_name (objfile));
11112 /* Prefer DW_AT_linkage_name (in the CANON form) - when it
11113 is available here - over computed PHYSNAME. It is safer
11114 against both buggy GDB and buggy compilers. */
11128 retval = ((const char *)
11129 obstack_copy0 (&objfile->per_bfd->storage_obstack,
11130 retval, strlen (retval)));
11135 /* Inspect DIE in CU for a namespace alias. If one exists, record
11136 a new symbol for it.
11138 Returns 1 if a namespace alias was recorded, 0 otherwise. */
11141 read_namespace_alias (struct die_info *die, struct dwarf2_cu *cu)
11143 struct attribute *attr;
11145 /* If the die does not have a name, this is not a namespace
11147 attr = dwarf2_attr (die, DW_AT_name, cu);
11151 struct die_info *d = die;
11152 struct dwarf2_cu *imported_cu = cu;
11154 /* If the compiler has nested DW_AT_imported_declaration DIEs,
11155 keep inspecting DIEs until we hit the underlying import. */
11156 #define MAX_NESTED_IMPORTED_DECLARATIONS 100
11157 for (num = 0; num < MAX_NESTED_IMPORTED_DECLARATIONS; ++num)
11159 attr = dwarf2_attr (d, DW_AT_import, cu);
11163 d = follow_die_ref (d, attr, &imported_cu);
11164 if (d->tag != DW_TAG_imported_declaration)
11168 if (num == MAX_NESTED_IMPORTED_DECLARATIONS)
11170 complaint (_("DIE at %s has too many recursively imported "
11171 "declarations"), sect_offset_str (d->sect_off));
11178 sect_offset sect_off = dwarf2_get_ref_die_offset (attr);
11180 type = get_die_type_at_offset (sect_off, cu->per_cu);
11181 if (type != NULL && TYPE_CODE (type) == TYPE_CODE_NAMESPACE)
11183 /* This declaration is a global namespace alias. Add
11184 a symbol for it whose type is the aliased namespace. */
11185 new_symbol (die, type, cu);
11194 /* Return the using directives repository (global or local?) to use in the
11195 current context for CU.
11197 For Ada, imported declarations can materialize renamings, which *may* be
11198 global. However it is impossible (for now?) in DWARF to distinguish
11199 "external" imported declarations and "static" ones. As all imported
11200 declarations seem to be static in all other languages, make them all CU-wide
11201 global only in Ada. */
11203 static struct using_direct **
11204 using_directives (struct dwarf2_cu *cu)
11206 if (cu->language == language_ada
11207 && cu->get_builder ()->outermost_context_p ())
11208 return cu->get_builder ()->get_global_using_directives ();
11210 return cu->get_builder ()->get_local_using_directives ();
11213 /* Read the import statement specified by the given die and record it. */
11216 read_import_statement (struct die_info *die, struct dwarf2_cu *cu)
11218 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
11219 struct attribute *import_attr;
11220 struct die_info *imported_die, *child_die;
11221 struct dwarf2_cu *imported_cu;
11222 const char *imported_name;
11223 const char *imported_name_prefix;
11224 const char *canonical_name;
11225 const char *import_alias;
11226 const char *imported_declaration = NULL;
11227 const char *import_prefix;
11228 std::vector<const char *> excludes;
11230 import_attr = dwarf2_attr (die, DW_AT_import, cu);
11231 if (import_attr == NULL)
11233 complaint (_("Tag '%s' has no DW_AT_import"),
11234 dwarf_tag_name (die->tag));
11239 imported_die = follow_die_ref_or_sig (die, import_attr, &imported_cu);
11240 imported_name = dwarf2_name (imported_die, imported_cu);
11241 if (imported_name == NULL)
11243 /* GCC bug: https://bugzilla.redhat.com/show_bug.cgi?id=506524
11245 The import in the following code:
11259 <2><51>: Abbrev Number: 3 (DW_TAG_imported_declaration)
11260 <52> DW_AT_decl_file : 1
11261 <53> DW_AT_decl_line : 6
11262 <54> DW_AT_import : <0x75>
11263 <2><58>: Abbrev Number: 4 (DW_TAG_typedef)
11264 <59> DW_AT_name : B
11265 <5b> DW_AT_decl_file : 1
11266 <5c> DW_AT_decl_line : 2
11267 <5d> DW_AT_type : <0x6e>
11269 <1><75>: Abbrev Number: 7 (DW_TAG_base_type)
11270 <76> DW_AT_byte_size : 4
11271 <77> DW_AT_encoding : 5 (signed)
11273 imports the wrong die ( 0x75 instead of 0x58 ).
11274 This case will be ignored until the gcc bug is fixed. */
11278 /* Figure out the local name after import. */
11279 import_alias = dwarf2_name (die, cu);
11281 /* Figure out where the statement is being imported to. */
11282 import_prefix = determine_prefix (die, cu);
11284 /* Figure out what the scope of the imported die is and prepend it
11285 to the name of the imported die. */
11286 imported_name_prefix = determine_prefix (imported_die, imported_cu);
11288 if (imported_die->tag != DW_TAG_namespace
11289 && imported_die->tag != DW_TAG_module)
11291 imported_declaration = imported_name;
11292 canonical_name = imported_name_prefix;
11294 else if (strlen (imported_name_prefix) > 0)
11295 canonical_name = obconcat (&objfile->objfile_obstack,
11296 imported_name_prefix,
11297 (cu->language == language_d ? "." : "::"),
11298 imported_name, (char *) NULL);
11300 canonical_name = imported_name;
11302 if (die->tag == DW_TAG_imported_module && cu->language == language_fortran)
11303 for (child_die = die->child; child_die && child_die->tag;
11304 child_die = sibling_die (child_die))
11306 /* DWARF-4: A Fortran use statement with a “rename list” may be
11307 represented by an imported module entry with an import attribute
11308 referring to the module and owned entries corresponding to those
11309 entities that are renamed as part of being imported. */
11311 if (child_die->tag != DW_TAG_imported_declaration)
11313 complaint (_("child DW_TAG_imported_declaration expected "
11314 "- DIE at %s [in module %s]"),
11315 sect_offset_str (child_die->sect_off),
11316 objfile_name (objfile));
11320 import_attr = dwarf2_attr (child_die, DW_AT_import, cu);
11321 if (import_attr == NULL)
11323 complaint (_("Tag '%s' has no DW_AT_import"),
11324 dwarf_tag_name (child_die->tag));
11329 imported_die = follow_die_ref_or_sig (child_die, import_attr,
11331 imported_name = dwarf2_name (imported_die, imported_cu);
11332 if (imported_name == NULL)
11334 complaint (_("child DW_TAG_imported_declaration has unknown "
11335 "imported name - DIE at %s [in module %s]"),
11336 sect_offset_str (child_die->sect_off),
11337 objfile_name (objfile));
11341 excludes.push_back (imported_name);
11343 process_die (child_die, cu);
11346 add_using_directive (using_directives (cu),
11350 imported_declaration,
11353 &objfile->objfile_obstack);
11356 /* ICC<14 does not output the required DW_AT_declaration on incomplete
11357 types, but gives them a size of zero. Starting with version 14,
11358 ICC is compatible with GCC. */
11361 producer_is_icc_lt_14 (struct dwarf2_cu *cu)
11363 if (!cu->checked_producer)
11364 check_producer (cu);
11366 return cu->producer_is_icc_lt_14;
11369 /* ICC generates a DW_AT_type for C void functions. This was observed on
11370 ICC 14.0.5.212, and appears to be against the DWARF spec (V5 3.3.2)
11371 which says that void functions should not have a DW_AT_type. */
11374 producer_is_icc (struct dwarf2_cu *cu)
11376 if (!cu->checked_producer)
11377 check_producer (cu);
11379 return cu->producer_is_icc;
11382 /* Check for possibly missing DW_AT_comp_dir with relative .debug_line
11383 directory paths. GCC SVN r127613 (new option -fdebug-prefix-map) fixed
11384 this, it was first present in GCC release 4.3.0. */
11387 producer_is_gcc_lt_4_3 (struct dwarf2_cu *cu)
11389 if (!cu->checked_producer)
11390 check_producer (cu);
11392 return cu->producer_is_gcc_lt_4_3;
11395 static file_and_directory
11396 find_file_and_directory (struct die_info *die, struct dwarf2_cu *cu)
11398 file_and_directory res;
11400 /* Find the filename. Do not use dwarf2_name here, since the filename
11401 is not a source language identifier. */
11402 res.name = dwarf2_string_attr (die, DW_AT_name, cu);
11403 res.comp_dir = dwarf2_string_attr (die, DW_AT_comp_dir, cu);
11405 if (res.comp_dir == NULL
11406 && producer_is_gcc_lt_4_3 (cu) && res.name != NULL
11407 && IS_ABSOLUTE_PATH (res.name))
11409 res.comp_dir_storage = ldirname (res.name);
11410 if (!res.comp_dir_storage.empty ())
11411 res.comp_dir = res.comp_dir_storage.c_str ();
11413 if (res.comp_dir != NULL)
11415 /* Irix 6.2 native cc prepends <machine>.: to the compilation
11416 directory, get rid of it. */
11417 const char *cp = strchr (res.comp_dir, ':');
11419 if (cp && cp != res.comp_dir && cp[-1] == '.' && cp[1] == '/')
11420 res.comp_dir = cp + 1;
11423 if (res.name == NULL)
11424 res.name = "<unknown>";
11429 /* Handle DW_AT_stmt_list for a compilation unit.
11430 DIE is the DW_TAG_compile_unit die for CU.
11431 COMP_DIR is the compilation directory. LOWPC is passed to
11432 dwarf_decode_lines. See dwarf_decode_lines comments about it. */
11435 handle_DW_AT_stmt_list (struct die_info *die, struct dwarf2_cu *cu,
11436 const char *comp_dir, CORE_ADDR lowpc) /* ARI: editCase function */
11438 struct dwarf2_per_objfile *dwarf2_per_objfile
11439 = cu->per_cu->dwarf2_per_objfile;
11440 struct objfile *objfile = dwarf2_per_objfile->objfile;
11441 struct attribute *attr;
11442 struct line_header line_header_local;
11443 hashval_t line_header_local_hash;
11445 int decode_mapping;
11447 gdb_assert (! cu->per_cu->is_debug_types);
11449 attr = dwarf2_attr (die, DW_AT_stmt_list, cu);
11453 sect_offset line_offset = (sect_offset) DW_UNSND (attr);
11455 /* The line header hash table is only created if needed (it exists to
11456 prevent redundant reading of the line table for partial_units).
11457 If we're given a partial_unit, we'll need it. If we're given a
11458 compile_unit, then use the line header hash table if it's already
11459 created, but don't create one just yet. */
11461 if (dwarf2_per_objfile->line_header_hash == NULL
11462 && die->tag == DW_TAG_partial_unit)
11464 dwarf2_per_objfile->line_header_hash
11465 = htab_create_alloc_ex (127, line_header_hash_voidp,
11466 line_header_eq_voidp,
11467 free_line_header_voidp,
11468 &objfile->objfile_obstack,
11469 hashtab_obstack_allocate,
11470 dummy_obstack_deallocate);
11473 line_header_local.sect_off = line_offset;
11474 line_header_local.offset_in_dwz = cu->per_cu->is_dwz;
11475 line_header_local_hash = line_header_hash (&line_header_local);
11476 if (dwarf2_per_objfile->line_header_hash != NULL)
11478 slot = htab_find_slot_with_hash (dwarf2_per_objfile->line_header_hash,
11479 &line_header_local,
11480 line_header_local_hash, NO_INSERT);
11482 /* For DW_TAG_compile_unit we need info like symtab::linetable which
11483 is not present in *SLOT (since if there is something in *SLOT then
11484 it will be for a partial_unit). */
11485 if (die->tag == DW_TAG_partial_unit && slot != NULL)
11487 gdb_assert (*slot != NULL);
11488 cu->line_header = (struct line_header *) *slot;
11493 /* dwarf_decode_line_header does not yet provide sufficient information.
11494 We always have to call also dwarf_decode_lines for it. */
11495 line_header_up lh = dwarf_decode_line_header (line_offset, cu);
11499 cu->line_header = lh.release ();
11500 cu->line_header_die_owner = die;
11502 if (dwarf2_per_objfile->line_header_hash == NULL)
11506 slot = htab_find_slot_with_hash (dwarf2_per_objfile->line_header_hash,
11507 &line_header_local,
11508 line_header_local_hash, INSERT);
11509 gdb_assert (slot != NULL);
11511 if (slot != NULL && *slot == NULL)
11513 /* This newly decoded line number information unit will be owned
11514 by line_header_hash hash table. */
11515 *slot = cu->line_header;
11516 cu->line_header_die_owner = NULL;
11520 /* We cannot free any current entry in (*slot) as that struct line_header
11521 may be already used by multiple CUs. Create only temporary decoded
11522 line_header for this CU - it may happen at most once for each line
11523 number information unit. And if we're not using line_header_hash
11524 then this is what we want as well. */
11525 gdb_assert (die->tag != DW_TAG_partial_unit);
11527 decode_mapping = (die->tag != DW_TAG_partial_unit);
11528 dwarf_decode_lines (cu->line_header, comp_dir, cu, NULL, lowpc,
11533 /* Process DW_TAG_compile_unit or DW_TAG_partial_unit. */
11536 read_file_scope (struct die_info *die, struct dwarf2_cu *cu)
11538 struct dwarf2_per_objfile *dwarf2_per_objfile
11539 = cu->per_cu->dwarf2_per_objfile;
11540 struct objfile *objfile = dwarf2_per_objfile->objfile;
11541 struct gdbarch *gdbarch = get_objfile_arch (objfile);
11542 CORE_ADDR lowpc = ((CORE_ADDR) -1);
11543 CORE_ADDR highpc = ((CORE_ADDR) 0);
11544 struct attribute *attr;
11545 struct die_info *child_die;
11546 CORE_ADDR baseaddr;
11548 prepare_one_comp_unit (cu, die, cu->language);
11549 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
11551 get_scope_pc_bounds (die, &lowpc, &highpc, cu);
11553 /* If we didn't find a lowpc, set it to highpc to avoid complaints
11554 from finish_block. */
11555 if (lowpc == ((CORE_ADDR) -1))
11557 lowpc = gdbarch_adjust_dwarf2_addr (gdbarch, lowpc + baseaddr);
11559 file_and_directory fnd = find_file_and_directory (die, cu);
11561 /* The XLCL doesn't generate DW_LANG_OpenCL because this attribute is not
11562 standardised yet. As a workaround for the language detection we fall
11563 back to the DW_AT_producer string. */
11564 if (cu->producer && strstr (cu->producer, "IBM XL C for OpenCL") != NULL)
11565 cu->language = language_opencl;
11567 /* Similar hack for Go. */
11568 if (cu->producer && strstr (cu->producer, "GNU Go ") != NULL)
11569 set_cu_language (DW_LANG_Go, cu);
11571 cu->start_symtab (fnd.name, fnd.comp_dir, lowpc);
11573 /* Decode line number information if present. We do this before
11574 processing child DIEs, so that the line header table is available
11575 for DW_AT_decl_file. */
11576 handle_DW_AT_stmt_list (die, cu, fnd.comp_dir, lowpc);
11578 /* Process all dies in compilation unit. */
11579 if (die->child != NULL)
11581 child_die = die->child;
11582 while (child_die && child_die->tag)
11584 process_die (child_die, cu);
11585 child_die = sibling_die (child_die);
11589 /* Decode macro information, if present. Dwarf 2 macro information
11590 refers to information in the line number info statement program
11591 header, so we can only read it if we've read the header
11593 attr = dwarf2_attr (die, DW_AT_macros, cu);
11595 attr = dwarf2_attr (die, DW_AT_GNU_macros, cu);
11596 if (attr && cu->line_header)
11598 if (dwarf2_attr (die, DW_AT_macro_info, cu))
11599 complaint (_("CU refers to both DW_AT_macros and DW_AT_macro_info"));
11601 dwarf_decode_macros (cu, DW_UNSND (attr), 1);
11605 attr = dwarf2_attr (die, DW_AT_macro_info, cu);
11606 if (attr && cu->line_header)
11608 unsigned int macro_offset = DW_UNSND (attr);
11610 dwarf_decode_macros (cu, macro_offset, 0);
11616 dwarf2_cu::setup_type_unit_groups (struct die_info *die)
11618 struct type_unit_group *tu_group;
11620 struct attribute *attr;
11622 struct signatured_type *sig_type;
11624 gdb_assert (per_cu->is_debug_types);
11625 sig_type = (struct signatured_type *) per_cu;
11627 attr = dwarf2_attr (die, DW_AT_stmt_list, this);
11629 /* If we're using .gdb_index (includes -readnow) then
11630 per_cu->type_unit_group may not have been set up yet. */
11631 if (sig_type->type_unit_group == NULL)
11632 sig_type->type_unit_group = get_type_unit_group (this, attr);
11633 tu_group = sig_type->type_unit_group;
11635 /* If we've already processed this stmt_list there's no real need to
11636 do it again, we could fake it and just recreate the part we need
11637 (file name,index -> symtab mapping). If data shows this optimization
11638 is useful we can do it then. */
11639 first_time = tu_group->compunit_symtab == NULL;
11641 /* We have to handle the case of both a missing DW_AT_stmt_list or bad
11646 sect_offset line_offset = (sect_offset) DW_UNSND (attr);
11647 lh = dwarf_decode_line_header (line_offset, this);
11652 start_symtab ("", NULL, 0);
11655 gdb_assert (tu_group->symtabs == NULL);
11656 gdb_assert (m_builder == nullptr);
11657 struct compunit_symtab *cust = tu_group->compunit_symtab;
11658 m_builder.reset (new struct buildsym_compunit
11659 (COMPUNIT_OBJFILE (cust), "",
11660 COMPUNIT_DIRNAME (cust),
11661 compunit_language (cust),
11667 line_header = lh.release ();
11668 line_header_die_owner = die;
11672 struct compunit_symtab *cust = start_symtab ("", NULL, 0);
11674 /* Note: We don't assign tu_group->compunit_symtab yet because we're
11675 still initializing it, and our caller (a few levels up)
11676 process_full_type_unit still needs to know if this is the first
11679 tu_group->num_symtabs = line_header->file_names.size ();
11680 tu_group->symtabs = XNEWVEC (struct symtab *,
11681 line_header->file_names.size ());
11683 for (i = 0; i < line_header->file_names.size (); ++i)
11685 file_entry &fe = line_header->file_names[i];
11687 dwarf2_start_subfile (this, fe.name,
11688 fe.include_dir (line_header));
11689 buildsym_compunit *b = get_builder ();
11690 if (b->get_current_subfile ()->symtab == NULL)
11692 /* NOTE: start_subfile will recognize when it's been
11693 passed a file it has already seen. So we can't
11694 assume there's a simple mapping from
11695 cu->line_header->file_names to subfiles, plus
11696 cu->line_header->file_names may contain dups. */
11697 b->get_current_subfile ()->symtab
11698 = allocate_symtab (cust, b->get_current_subfile ()->name);
11701 fe.symtab = b->get_current_subfile ()->symtab;
11702 tu_group->symtabs[i] = fe.symtab;
11707 gdb_assert (m_builder == nullptr);
11708 struct compunit_symtab *cust = tu_group->compunit_symtab;
11709 m_builder.reset (new struct buildsym_compunit
11710 (COMPUNIT_OBJFILE (cust), "",
11711 COMPUNIT_DIRNAME (cust),
11712 compunit_language (cust),
11715 for (i = 0; i < line_header->file_names.size (); ++i)
11717 file_entry &fe = line_header->file_names[i];
11719 fe.symtab = tu_group->symtabs[i];
11723 /* The main symtab is allocated last. Type units don't have DW_AT_name
11724 so they don't have a "real" (so to speak) symtab anyway.
11725 There is later code that will assign the main symtab to all symbols
11726 that don't have one. We need to handle the case of a symbol with a
11727 missing symtab (DW_AT_decl_file) anyway. */
11730 /* Process DW_TAG_type_unit.
11731 For TUs we want to skip the first top level sibling if it's not the
11732 actual type being defined by this TU. In this case the first top
11733 level sibling is there to provide context only. */
11736 read_type_unit_scope (struct die_info *die, struct dwarf2_cu *cu)
11738 struct die_info *child_die;
11740 prepare_one_comp_unit (cu, die, language_minimal);
11742 /* Initialize (or reinitialize) the machinery for building symtabs.
11743 We do this before processing child DIEs, so that the line header table
11744 is available for DW_AT_decl_file. */
11745 cu->setup_type_unit_groups (die);
11747 if (die->child != NULL)
11749 child_die = die->child;
11750 while (child_die && child_die->tag)
11752 process_die (child_die, cu);
11753 child_die = sibling_die (child_die);
11760 http://gcc.gnu.org/wiki/DebugFission
11761 http://gcc.gnu.org/wiki/DebugFissionDWP
11763 To simplify handling of both DWO files ("object" files with the DWARF info)
11764 and DWP files (a file with the DWOs packaged up into one file), we treat
11765 DWP files as having a collection of virtual DWO files. */
11768 hash_dwo_file (const void *item)
11770 const struct dwo_file *dwo_file = (const struct dwo_file *) item;
11773 hash = htab_hash_string (dwo_file->dwo_name);
11774 if (dwo_file->comp_dir != NULL)
11775 hash += htab_hash_string (dwo_file->comp_dir);
11780 eq_dwo_file (const void *item_lhs, const void *item_rhs)
11782 const struct dwo_file *lhs = (const struct dwo_file *) item_lhs;
11783 const struct dwo_file *rhs = (const struct dwo_file *) item_rhs;
11785 if (strcmp (lhs->dwo_name, rhs->dwo_name) != 0)
11787 if (lhs->comp_dir == NULL || rhs->comp_dir == NULL)
11788 return lhs->comp_dir == rhs->comp_dir;
11789 return strcmp (lhs->comp_dir, rhs->comp_dir) == 0;
11792 /* Allocate a hash table for DWO files. */
11795 allocate_dwo_file_hash_table (struct objfile *objfile)
11797 return htab_create_alloc_ex (41,
11801 &objfile->objfile_obstack,
11802 hashtab_obstack_allocate,
11803 dummy_obstack_deallocate);
11806 /* Lookup DWO file DWO_NAME. */
11809 lookup_dwo_file_slot (struct dwarf2_per_objfile *dwarf2_per_objfile,
11810 const char *dwo_name,
11811 const char *comp_dir)
11813 struct dwo_file find_entry;
11816 if (dwarf2_per_objfile->dwo_files == NULL)
11817 dwarf2_per_objfile->dwo_files
11818 = allocate_dwo_file_hash_table (dwarf2_per_objfile->objfile);
11820 memset (&find_entry, 0, sizeof (find_entry));
11821 find_entry.dwo_name = dwo_name;
11822 find_entry.comp_dir = comp_dir;
11823 slot = htab_find_slot (dwarf2_per_objfile->dwo_files, &find_entry, INSERT);
11829 hash_dwo_unit (const void *item)
11831 const struct dwo_unit *dwo_unit = (const struct dwo_unit *) item;
11833 /* This drops the top 32 bits of the id, but is ok for a hash. */
11834 return dwo_unit->signature;
11838 eq_dwo_unit (const void *item_lhs, const void *item_rhs)
11840 const struct dwo_unit *lhs = (const struct dwo_unit *) item_lhs;
11841 const struct dwo_unit *rhs = (const struct dwo_unit *) item_rhs;
11843 /* The signature is assumed to be unique within the DWO file.
11844 So while object file CU dwo_id's always have the value zero,
11845 that's OK, assuming each object file DWO file has only one CU,
11846 and that's the rule for now. */
11847 return lhs->signature == rhs->signature;
11850 /* Allocate a hash table for DWO CUs,TUs.
11851 There is one of these tables for each of CUs,TUs for each DWO file. */
11854 allocate_dwo_unit_table (struct objfile *objfile)
11856 /* Start out with a pretty small number.
11857 Generally DWO files contain only one CU and maybe some TUs. */
11858 return htab_create_alloc_ex (3,
11862 &objfile->objfile_obstack,
11863 hashtab_obstack_allocate,
11864 dummy_obstack_deallocate);
11867 /* Structure used to pass data to create_dwo_debug_info_hash_table_reader. */
11869 struct create_dwo_cu_data
11871 struct dwo_file *dwo_file;
11872 struct dwo_unit dwo_unit;
11875 /* die_reader_func for create_dwo_cu. */
11878 create_dwo_cu_reader (const struct die_reader_specs *reader,
11879 const gdb_byte *info_ptr,
11880 struct die_info *comp_unit_die,
11884 struct dwarf2_cu *cu = reader->cu;
11885 sect_offset sect_off = cu->per_cu->sect_off;
11886 struct dwarf2_section_info *section = cu->per_cu->section;
11887 struct create_dwo_cu_data *data = (struct create_dwo_cu_data *) datap;
11888 struct dwo_file *dwo_file = data->dwo_file;
11889 struct dwo_unit *dwo_unit = &data->dwo_unit;
11890 struct attribute *attr;
11892 attr = dwarf2_attr (comp_unit_die, DW_AT_GNU_dwo_id, cu);
11895 complaint (_("Dwarf Error: debug entry at offset %s is missing"
11896 " its dwo_id [in module %s]"),
11897 sect_offset_str (sect_off), dwo_file->dwo_name);
11901 dwo_unit->dwo_file = dwo_file;
11902 dwo_unit->signature = DW_UNSND (attr);
11903 dwo_unit->section = section;
11904 dwo_unit->sect_off = sect_off;
11905 dwo_unit->length = cu->per_cu->length;
11907 if (dwarf_read_debug)
11908 fprintf_unfiltered (gdb_stdlog, " offset %s, dwo_id %s\n",
11909 sect_offset_str (sect_off),
11910 hex_string (dwo_unit->signature));
11913 /* Create the dwo_units for the CUs in a DWO_FILE.
11914 Note: This function processes DWO files only, not DWP files. */
11917 create_cus_hash_table (struct dwarf2_per_objfile *dwarf2_per_objfile,
11918 struct dwo_file &dwo_file, dwarf2_section_info §ion,
11921 struct objfile *objfile = dwarf2_per_objfile->objfile;
11922 const gdb_byte *info_ptr, *end_ptr;
11924 dwarf2_read_section (objfile, §ion);
11925 info_ptr = section.buffer;
11927 if (info_ptr == NULL)
11930 if (dwarf_read_debug)
11932 fprintf_unfiltered (gdb_stdlog, "Reading %s for %s:\n",
11933 get_section_name (§ion),
11934 get_section_file_name (§ion));
11937 end_ptr = info_ptr + section.size;
11938 while (info_ptr < end_ptr)
11940 struct dwarf2_per_cu_data per_cu;
11941 struct create_dwo_cu_data create_dwo_cu_data;
11942 struct dwo_unit *dwo_unit;
11944 sect_offset sect_off = (sect_offset) (info_ptr - section.buffer);
11946 memset (&create_dwo_cu_data.dwo_unit, 0,
11947 sizeof (create_dwo_cu_data.dwo_unit));
11948 memset (&per_cu, 0, sizeof (per_cu));
11949 per_cu.dwarf2_per_objfile = dwarf2_per_objfile;
11950 per_cu.is_debug_types = 0;
11951 per_cu.sect_off = sect_offset (info_ptr - section.buffer);
11952 per_cu.section = §ion;
11953 create_dwo_cu_data.dwo_file = &dwo_file;
11955 init_cutu_and_read_dies_no_follow (
11956 &per_cu, &dwo_file, create_dwo_cu_reader, &create_dwo_cu_data);
11957 info_ptr += per_cu.length;
11959 // If the unit could not be parsed, skip it.
11960 if (create_dwo_cu_data.dwo_unit.dwo_file == NULL)
11963 if (cus_htab == NULL)
11964 cus_htab = allocate_dwo_unit_table (objfile);
11966 dwo_unit = OBSTACK_ZALLOC (&objfile->objfile_obstack, struct dwo_unit);
11967 *dwo_unit = create_dwo_cu_data.dwo_unit;
11968 slot = htab_find_slot (cus_htab, dwo_unit, INSERT);
11969 gdb_assert (slot != NULL);
11972 const struct dwo_unit *dup_cu = (const struct dwo_unit *)*slot;
11973 sect_offset dup_sect_off = dup_cu->sect_off;
11975 complaint (_("debug cu entry at offset %s is duplicate to"
11976 " the entry at offset %s, signature %s"),
11977 sect_offset_str (sect_off), sect_offset_str (dup_sect_off),
11978 hex_string (dwo_unit->signature));
11980 *slot = (void *)dwo_unit;
11984 /* DWP file .debug_{cu,tu}_index section format:
11985 [ref: http://gcc.gnu.org/wiki/DebugFissionDWP]
11989 Both index sections have the same format, and serve to map a 64-bit
11990 signature to a set of section numbers. Each section begins with a header,
11991 followed by a hash table of 64-bit signatures, a parallel table of 32-bit
11992 indexes, and a pool of 32-bit section numbers. The index sections will be
11993 aligned at 8-byte boundaries in the file.
11995 The index section header consists of:
11997 V, 32 bit version number
11999 N, 32 bit number of compilation units or type units in the index
12000 M, 32 bit number of slots in the hash table
12002 Numbers are recorded using the byte order of the application binary.
12004 The hash table begins at offset 16 in the section, and consists of an array
12005 of M 64-bit slots. Each slot contains a 64-bit signature (using the byte
12006 order of the application binary). Unused slots in the hash table are 0.
12007 (We rely on the extreme unlikeliness of a signature being exactly 0.)
12009 The parallel table begins immediately after the hash table
12010 (at offset 16 + 8 * M from the beginning of the section), and consists of an
12011 array of 32-bit indexes (using the byte order of the application binary),
12012 corresponding 1-1 with slots in the hash table. Each entry in the parallel
12013 table contains a 32-bit index into the pool of section numbers. For unused
12014 hash table slots, the corresponding entry in the parallel table will be 0.
12016 The pool of section numbers begins immediately following the hash table
12017 (at offset 16 + 12 * M from the beginning of the section). The pool of
12018 section numbers consists of an array of 32-bit words (using the byte order
12019 of the application binary). Each item in the array is indexed starting
12020 from 0. The hash table entry provides the index of the first section
12021 number in the set. Additional section numbers in the set follow, and the
12022 set is terminated by a 0 entry (section number 0 is not used in ELF).
12024 In each set of section numbers, the .debug_info.dwo or .debug_types.dwo
12025 section must be the first entry in the set, and the .debug_abbrev.dwo must
12026 be the second entry. Other members of the set may follow in any order.
12032 DWP Version 2 combines all the .debug_info, etc. sections into one,
12033 and the entries in the index tables are now offsets into these sections.
12034 CU offsets begin at 0. TU offsets begin at the size of the .debug_info
12037 Index Section Contents:
12039 Hash Table of Signatures dwp_hash_table.hash_table
12040 Parallel Table of Indices dwp_hash_table.unit_table
12041 Table of Section Offsets dwp_hash_table.v2.{section_ids,offsets}
12042 Table of Section Sizes dwp_hash_table.v2.sizes
12044 The index section header consists of:
12046 V, 32 bit version number
12047 L, 32 bit number of columns in the table of section offsets
12048 N, 32 bit number of compilation units or type units in the index
12049 M, 32 bit number of slots in the hash table
12051 Numbers are recorded using the byte order of the application binary.
12053 The hash table has the same format as version 1.
12054 The parallel table of indices has the same format as version 1,
12055 except that the entries are origin-1 indices into the table of sections
12056 offsets and the table of section sizes.
12058 The table of offsets begins immediately following the parallel table
12059 (at offset 16 + 12 * M from the beginning of the section). The table is
12060 a two-dimensional array of 32-bit words (using the byte order of the
12061 application binary), with L columns and N+1 rows, in row-major order.
12062 Each row in the array is indexed starting from 0. The first row provides
12063 a key to the remaining rows: each column in this row provides an identifier
12064 for a debug section, and the offsets in the same column of subsequent rows
12065 refer to that section. The section identifiers are:
12067 DW_SECT_INFO 1 .debug_info.dwo
12068 DW_SECT_TYPES 2 .debug_types.dwo
12069 DW_SECT_ABBREV 3 .debug_abbrev.dwo
12070 DW_SECT_LINE 4 .debug_line.dwo
12071 DW_SECT_LOC 5 .debug_loc.dwo
12072 DW_SECT_STR_OFFSETS 6 .debug_str_offsets.dwo
12073 DW_SECT_MACINFO 7 .debug_macinfo.dwo
12074 DW_SECT_MACRO 8 .debug_macro.dwo
12076 The offsets provided by the CU and TU index sections are the base offsets
12077 for the contributions made by each CU or TU to the corresponding section
12078 in the package file. Each CU and TU header contains an abbrev_offset
12079 field, used to find the abbreviations table for that CU or TU within the
12080 contribution to the .debug_abbrev.dwo section for that CU or TU, and should
12081 be interpreted as relative to the base offset given in the index section.
12082 Likewise, offsets into .debug_line.dwo from DW_AT_stmt_list attributes
12083 should be interpreted as relative to the base offset for .debug_line.dwo,
12084 and offsets into other debug sections obtained from DWARF attributes should
12085 also be interpreted as relative to the corresponding base offset.
12087 The table of sizes begins immediately following the table of offsets.
12088 Like the table of offsets, it is a two-dimensional array of 32-bit words,
12089 with L columns and N rows, in row-major order. Each row in the array is
12090 indexed starting from 1 (row 0 is shared by the two tables).
12094 Hash table lookup is handled the same in version 1 and 2:
12096 We assume that N and M will not exceed 2^32 - 1.
12097 The size of the hash table, M, must be 2^k such that 2^k > 3*N/2.
12099 Given a 64-bit compilation unit signature or a type signature S, an entry
12100 in the hash table is located as follows:
12102 1) Calculate a primary hash H = S & MASK(k), where MASK(k) is a mask with
12103 the low-order k bits all set to 1.
12105 2) Calculate a secondary hash H' = (((S >> 32) & MASK(k)) | 1).
12107 3) If the hash table entry at index H matches the signature, use that
12108 entry. If the hash table entry at index H is unused (all zeroes),
12109 terminate the search: the signature is not present in the table.
12111 4) Let H = (H + H') modulo M. Repeat at Step 3.
12113 Because M > N and H' and M are relatively prime, the search is guaranteed
12114 to stop at an unused slot or find the match. */
12116 /* Create a hash table to map DWO IDs to their CU/TU entry in
12117 .debug_{info,types}.dwo in DWP_FILE.
12118 Returns NULL if there isn't one.
12119 Note: This function processes DWP files only, not DWO files. */
12121 static struct dwp_hash_table *
12122 create_dwp_hash_table (struct dwarf2_per_objfile *dwarf2_per_objfile,
12123 struct dwp_file *dwp_file, int is_debug_types)
12125 struct objfile *objfile = dwarf2_per_objfile->objfile;
12126 bfd *dbfd = dwp_file->dbfd.get ();
12127 const gdb_byte *index_ptr, *index_end;
12128 struct dwarf2_section_info *index;
12129 uint32_t version, nr_columns, nr_units, nr_slots;
12130 struct dwp_hash_table *htab;
12132 if (is_debug_types)
12133 index = &dwp_file->sections.tu_index;
12135 index = &dwp_file->sections.cu_index;
12137 if (dwarf2_section_empty_p (index))
12139 dwarf2_read_section (objfile, index);
12141 index_ptr = index->buffer;
12142 index_end = index_ptr + index->size;
12144 version = read_4_bytes (dbfd, index_ptr);
12147 nr_columns = read_4_bytes (dbfd, index_ptr);
12151 nr_units = read_4_bytes (dbfd, index_ptr);
12153 nr_slots = read_4_bytes (dbfd, index_ptr);
12156 if (version != 1 && version != 2)
12158 error (_("Dwarf Error: unsupported DWP file version (%s)"
12159 " [in module %s]"),
12160 pulongest (version), dwp_file->name);
12162 if (nr_slots != (nr_slots & -nr_slots))
12164 error (_("Dwarf Error: number of slots in DWP hash table (%s)"
12165 " is not power of 2 [in module %s]"),
12166 pulongest (nr_slots), dwp_file->name);
12169 htab = OBSTACK_ZALLOC (&objfile->objfile_obstack, struct dwp_hash_table);
12170 htab->version = version;
12171 htab->nr_columns = nr_columns;
12172 htab->nr_units = nr_units;
12173 htab->nr_slots = nr_slots;
12174 htab->hash_table = index_ptr;
12175 htab->unit_table = htab->hash_table + sizeof (uint64_t) * nr_slots;
12177 /* Exit early if the table is empty. */
12178 if (nr_slots == 0 || nr_units == 0
12179 || (version == 2 && nr_columns == 0))
12181 /* All must be zero. */
12182 if (nr_slots != 0 || nr_units != 0
12183 || (version == 2 && nr_columns != 0))
12185 complaint (_("Empty DWP but nr_slots,nr_units,nr_columns not"
12186 " all zero [in modules %s]"),
12194 htab->section_pool.v1.indices =
12195 htab->unit_table + sizeof (uint32_t) * nr_slots;
12196 /* It's harder to decide whether the section is too small in v1.
12197 V1 is deprecated anyway so we punt. */
12201 const gdb_byte *ids_ptr = htab->unit_table + sizeof (uint32_t) * nr_slots;
12202 int *ids = htab->section_pool.v2.section_ids;
12203 size_t sizeof_ids = sizeof (htab->section_pool.v2.section_ids);
12204 /* Reverse map for error checking. */
12205 int ids_seen[DW_SECT_MAX + 1];
12208 if (nr_columns < 2)
12210 error (_("Dwarf Error: bad DWP hash table, too few columns"
12211 " in section table [in module %s]"),
12214 if (nr_columns > MAX_NR_V2_DWO_SECTIONS)
12216 error (_("Dwarf Error: bad DWP hash table, too many columns"
12217 " in section table [in module %s]"),
12220 memset (ids, 255, sizeof_ids);
12221 memset (ids_seen, 255, sizeof (ids_seen));
12222 for (i = 0; i < nr_columns; ++i)
12224 int id = read_4_bytes (dbfd, ids_ptr + i * sizeof (uint32_t));
12226 if (id < DW_SECT_MIN || id > DW_SECT_MAX)
12228 error (_("Dwarf Error: bad DWP hash table, bad section id %d"
12229 " in section table [in module %s]"),
12230 id, dwp_file->name);
12232 if (ids_seen[id] != -1)
12234 error (_("Dwarf Error: bad DWP hash table, duplicate section"
12235 " id %d in section table [in module %s]"),
12236 id, dwp_file->name);
12241 /* Must have exactly one info or types section. */
12242 if (((ids_seen[DW_SECT_INFO] != -1)
12243 + (ids_seen[DW_SECT_TYPES] != -1))
12246 error (_("Dwarf Error: bad DWP hash table, missing/duplicate"
12247 " DWO info/types section [in module %s]"),
12250 /* Must have an abbrev section. */
12251 if (ids_seen[DW_SECT_ABBREV] == -1)
12253 error (_("Dwarf Error: bad DWP hash table, missing DWO abbrev"
12254 " section [in module %s]"),
12257 htab->section_pool.v2.offsets = ids_ptr + sizeof (uint32_t) * nr_columns;
12258 htab->section_pool.v2.sizes =
12259 htab->section_pool.v2.offsets + (sizeof (uint32_t)
12260 * nr_units * nr_columns);
12261 if ((htab->section_pool.v2.sizes + (sizeof (uint32_t)
12262 * nr_units * nr_columns))
12265 error (_("Dwarf Error: DWP index section is corrupt (too small)"
12266 " [in module %s]"),
12274 /* Update SECTIONS with the data from SECTP.
12276 This function is like the other "locate" section routines that are
12277 passed to bfd_map_over_sections, but in this context the sections to
12278 read comes from the DWP V1 hash table, not the full ELF section table.
12280 The result is non-zero for success, or zero if an error was found. */
12283 locate_v1_virtual_dwo_sections (asection *sectp,
12284 struct virtual_v1_dwo_sections *sections)
12286 const struct dwop_section_names *names = &dwop_section_names;
12288 if (section_is_p (sectp->name, &names->abbrev_dwo))
12290 /* There can be only one. */
12291 if (sections->abbrev.s.section != NULL)
12293 sections->abbrev.s.section = sectp;
12294 sections->abbrev.size = bfd_get_section_size (sectp);
12296 else if (section_is_p (sectp->name, &names->info_dwo)
12297 || section_is_p (sectp->name, &names->types_dwo))
12299 /* There can be only one. */
12300 if (sections->info_or_types.s.section != NULL)
12302 sections->info_or_types.s.section = sectp;
12303 sections->info_or_types.size = bfd_get_section_size (sectp);
12305 else if (section_is_p (sectp->name, &names->line_dwo))
12307 /* There can be only one. */
12308 if (sections->line.s.section != NULL)
12310 sections->line.s.section = sectp;
12311 sections->line.size = bfd_get_section_size (sectp);
12313 else if (section_is_p (sectp->name, &names->loc_dwo))
12315 /* There can be only one. */
12316 if (sections->loc.s.section != NULL)
12318 sections->loc.s.section = sectp;
12319 sections->loc.size = bfd_get_section_size (sectp);
12321 else if (section_is_p (sectp->name, &names->macinfo_dwo))
12323 /* There can be only one. */
12324 if (sections->macinfo.s.section != NULL)
12326 sections->macinfo.s.section = sectp;
12327 sections->macinfo.size = bfd_get_section_size (sectp);
12329 else if (section_is_p (sectp->name, &names->macro_dwo))
12331 /* There can be only one. */
12332 if (sections->macro.s.section != NULL)
12334 sections->macro.s.section = sectp;
12335 sections->macro.size = bfd_get_section_size (sectp);
12337 else if (section_is_p (sectp->name, &names->str_offsets_dwo))
12339 /* There can be only one. */
12340 if (sections->str_offsets.s.section != NULL)
12342 sections->str_offsets.s.section = sectp;
12343 sections->str_offsets.size = bfd_get_section_size (sectp);
12347 /* No other kind of section is valid. */
12354 /* Create a dwo_unit object for the DWO unit with signature SIGNATURE.
12355 UNIT_INDEX is the index of the DWO unit in the DWP hash table.
12356 COMP_DIR is the DW_AT_comp_dir attribute of the referencing CU.
12357 This is for DWP version 1 files. */
12359 static struct dwo_unit *
12360 create_dwo_unit_in_dwp_v1 (struct dwarf2_per_objfile *dwarf2_per_objfile,
12361 struct dwp_file *dwp_file,
12362 uint32_t unit_index,
12363 const char *comp_dir,
12364 ULONGEST signature, int is_debug_types)
12366 struct objfile *objfile = dwarf2_per_objfile->objfile;
12367 const struct dwp_hash_table *dwp_htab =
12368 is_debug_types ? dwp_file->tus : dwp_file->cus;
12369 bfd *dbfd = dwp_file->dbfd.get ();
12370 const char *kind = is_debug_types ? "TU" : "CU";
12371 struct dwo_file *dwo_file;
12372 struct dwo_unit *dwo_unit;
12373 struct virtual_v1_dwo_sections sections;
12374 void **dwo_file_slot;
12377 gdb_assert (dwp_file->version == 1);
12379 if (dwarf_read_debug)
12381 fprintf_unfiltered (gdb_stdlog, "Reading %s %s/%s in DWP V1 file: %s\n",
12383 pulongest (unit_index), hex_string (signature),
12387 /* Fetch the sections of this DWO unit.
12388 Put a limit on the number of sections we look for so that bad data
12389 doesn't cause us to loop forever. */
12391 #define MAX_NR_V1_DWO_SECTIONS \
12392 (1 /* .debug_info or .debug_types */ \
12393 + 1 /* .debug_abbrev */ \
12394 + 1 /* .debug_line */ \
12395 + 1 /* .debug_loc */ \
12396 + 1 /* .debug_str_offsets */ \
12397 + 1 /* .debug_macro or .debug_macinfo */ \
12398 + 1 /* trailing zero */)
12400 memset (§ions, 0, sizeof (sections));
12402 for (i = 0; i < MAX_NR_V1_DWO_SECTIONS; ++i)
12405 uint32_t section_nr =
12406 read_4_bytes (dbfd,
12407 dwp_htab->section_pool.v1.indices
12408 + (unit_index + i) * sizeof (uint32_t));
12410 if (section_nr == 0)
12412 if (section_nr >= dwp_file->num_sections)
12414 error (_("Dwarf Error: bad DWP hash table, section number too large"
12415 " [in module %s]"),
12419 sectp = dwp_file->elf_sections[section_nr];
12420 if (! locate_v1_virtual_dwo_sections (sectp, §ions))
12422 error (_("Dwarf Error: bad DWP hash table, invalid section found"
12423 " [in module %s]"),
12429 || dwarf2_section_empty_p (§ions.info_or_types)
12430 || dwarf2_section_empty_p (§ions.abbrev))
12432 error (_("Dwarf Error: bad DWP hash table, missing DWO sections"
12433 " [in module %s]"),
12436 if (i == MAX_NR_V1_DWO_SECTIONS)
12438 error (_("Dwarf Error: bad DWP hash table, too many DWO sections"
12439 " [in module %s]"),
12443 /* It's easier for the rest of the code if we fake a struct dwo_file and
12444 have dwo_unit "live" in that. At least for now.
12446 The DWP file can be made up of a random collection of CUs and TUs.
12447 However, for each CU + set of TUs that came from the same original DWO
12448 file, we can combine them back into a virtual DWO file to save space
12449 (fewer struct dwo_file objects to allocate). Remember that for really
12450 large apps there can be on the order of 8K CUs and 200K TUs, or more. */
12452 std::string virtual_dwo_name =
12453 string_printf ("virtual-dwo/%d-%d-%d-%d",
12454 get_section_id (§ions.abbrev),
12455 get_section_id (§ions.line),
12456 get_section_id (§ions.loc),
12457 get_section_id (§ions.str_offsets));
12458 /* Can we use an existing virtual DWO file? */
12459 dwo_file_slot = lookup_dwo_file_slot (dwarf2_per_objfile,
12460 virtual_dwo_name.c_str (),
12462 /* Create one if necessary. */
12463 if (*dwo_file_slot == NULL)
12465 if (dwarf_read_debug)
12467 fprintf_unfiltered (gdb_stdlog, "Creating virtual DWO: %s\n",
12468 virtual_dwo_name.c_str ());
12470 dwo_file = OBSTACK_ZALLOC (&objfile->objfile_obstack, struct dwo_file);
12472 = (const char *) obstack_copy0 (&objfile->objfile_obstack,
12473 virtual_dwo_name.c_str (),
12474 virtual_dwo_name.size ());
12475 dwo_file->comp_dir = comp_dir;
12476 dwo_file->sections.abbrev = sections.abbrev;
12477 dwo_file->sections.line = sections.line;
12478 dwo_file->sections.loc = sections.loc;
12479 dwo_file->sections.macinfo = sections.macinfo;
12480 dwo_file->sections.macro = sections.macro;
12481 dwo_file->sections.str_offsets = sections.str_offsets;
12482 /* The "str" section is global to the entire DWP file. */
12483 dwo_file->sections.str = dwp_file->sections.str;
12484 /* The info or types section is assigned below to dwo_unit,
12485 there's no need to record it in dwo_file.
12486 Also, we can't simply record type sections in dwo_file because
12487 we record a pointer into the vector in dwo_unit. As we collect more
12488 types we'll grow the vector and eventually have to reallocate space
12489 for it, invalidating all copies of pointers into the previous
12491 *dwo_file_slot = dwo_file;
12495 if (dwarf_read_debug)
12497 fprintf_unfiltered (gdb_stdlog, "Using existing virtual DWO: %s\n",
12498 virtual_dwo_name.c_str ());
12500 dwo_file = (struct dwo_file *) *dwo_file_slot;
12503 dwo_unit = OBSTACK_ZALLOC (&objfile->objfile_obstack, struct dwo_unit);
12504 dwo_unit->dwo_file = dwo_file;
12505 dwo_unit->signature = signature;
12506 dwo_unit->section =
12507 XOBNEW (&objfile->objfile_obstack, struct dwarf2_section_info);
12508 *dwo_unit->section = sections.info_or_types;
12509 /* dwo_unit->{offset,length,type_offset_in_tu} are set later. */
12514 /* Subroutine of create_dwo_unit_in_dwp_v2 to simplify it.
12515 Given a pointer to the containing section SECTION, and OFFSET,SIZE of the
12516 piece within that section used by a TU/CU, return a virtual section
12517 of just that piece. */
12519 static struct dwarf2_section_info
12520 create_dwp_v2_section (struct dwarf2_per_objfile *dwarf2_per_objfile,
12521 struct dwarf2_section_info *section,
12522 bfd_size_type offset, bfd_size_type size)
12524 struct dwarf2_section_info result;
12527 gdb_assert (section != NULL);
12528 gdb_assert (!section->is_virtual);
12530 memset (&result, 0, sizeof (result));
12531 result.s.containing_section = section;
12532 result.is_virtual = 1;
12537 sectp = get_section_bfd_section (section);
12539 /* Flag an error if the piece denoted by OFFSET,SIZE is outside the
12540 bounds of the real section. This is a pretty-rare event, so just
12541 flag an error (easier) instead of a warning and trying to cope. */
12543 || offset + size > bfd_get_section_size (sectp))
12545 error (_("Dwarf Error: Bad DWP V2 section info, doesn't fit"
12546 " in section %s [in module %s]"),
12547 sectp ? bfd_section_name (abfd, sectp) : "<unknown>",
12548 objfile_name (dwarf2_per_objfile->objfile));
12551 result.virtual_offset = offset;
12552 result.size = size;
12556 /* Create a dwo_unit object for the DWO unit with signature SIGNATURE.
12557 UNIT_INDEX is the index of the DWO unit in the DWP hash table.
12558 COMP_DIR is the DW_AT_comp_dir attribute of the referencing CU.
12559 This is for DWP version 2 files. */
12561 static struct dwo_unit *
12562 create_dwo_unit_in_dwp_v2 (struct dwarf2_per_objfile *dwarf2_per_objfile,
12563 struct dwp_file *dwp_file,
12564 uint32_t unit_index,
12565 const char *comp_dir,
12566 ULONGEST signature, int is_debug_types)
12568 struct objfile *objfile = dwarf2_per_objfile->objfile;
12569 const struct dwp_hash_table *dwp_htab =
12570 is_debug_types ? dwp_file->tus : dwp_file->cus;
12571 bfd *dbfd = dwp_file->dbfd.get ();
12572 const char *kind = is_debug_types ? "TU" : "CU";
12573 struct dwo_file *dwo_file;
12574 struct dwo_unit *dwo_unit;
12575 struct virtual_v2_dwo_sections sections;
12576 void **dwo_file_slot;
12579 gdb_assert (dwp_file->version == 2);
12581 if (dwarf_read_debug)
12583 fprintf_unfiltered (gdb_stdlog, "Reading %s %s/%s in DWP V2 file: %s\n",
12585 pulongest (unit_index), hex_string (signature),
12589 /* Fetch the section offsets of this DWO unit. */
12591 memset (§ions, 0, sizeof (sections));
12593 for (i = 0; i < dwp_htab->nr_columns; ++i)
12595 uint32_t offset = read_4_bytes (dbfd,
12596 dwp_htab->section_pool.v2.offsets
12597 + (((unit_index - 1) * dwp_htab->nr_columns
12599 * sizeof (uint32_t)));
12600 uint32_t size = read_4_bytes (dbfd,
12601 dwp_htab->section_pool.v2.sizes
12602 + (((unit_index - 1) * dwp_htab->nr_columns
12604 * sizeof (uint32_t)));
12606 switch (dwp_htab->section_pool.v2.section_ids[i])
12609 case DW_SECT_TYPES:
12610 sections.info_or_types_offset = offset;
12611 sections.info_or_types_size = size;
12613 case DW_SECT_ABBREV:
12614 sections.abbrev_offset = offset;
12615 sections.abbrev_size = size;
12618 sections.line_offset = offset;
12619 sections.line_size = size;
12622 sections.loc_offset = offset;
12623 sections.loc_size = size;
12625 case DW_SECT_STR_OFFSETS:
12626 sections.str_offsets_offset = offset;
12627 sections.str_offsets_size = size;
12629 case DW_SECT_MACINFO:
12630 sections.macinfo_offset = offset;
12631 sections.macinfo_size = size;
12633 case DW_SECT_MACRO:
12634 sections.macro_offset = offset;
12635 sections.macro_size = size;
12640 /* It's easier for the rest of the code if we fake a struct dwo_file and
12641 have dwo_unit "live" in that. At least for now.
12643 The DWP file can be made up of a random collection of CUs and TUs.
12644 However, for each CU + set of TUs that came from the same original DWO
12645 file, we can combine them back into a virtual DWO file to save space
12646 (fewer struct dwo_file objects to allocate). Remember that for really
12647 large apps there can be on the order of 8K CUs and 200K TUs, or more. */
12649 std::string virtual_dwo_name =
12650 string_printf ("virtual-dwo/%ld-%ld-%ld-%ld",
12651 (long) (sections.abbrev_size ? sections.abbrev_offset : 0),
12652 (long) (sections.line_size ? sections.line_offset : 0),
12653 (long) (sections.loc_size ? sections.loc_offset : 0),
12654 (long) (sections.str_offsets_size
12655 ? sections.str_offsets_offset : 0));
12656 /* Can we use an existing virtual DWO file? */
12657 dwo_file_slot = lookup_dwo_file_slot (dwarf2_per_objfile,
12658 virtual_dwo_name.c_str (),
12660 /* Create one if necessary. */
12661 if (*dwo_file_slot == NULL)
12663 if (dwarf_read_debug)
12665 fprintf_unfiltered (gdb_stdlog, "Creating virtual DWO: %s\n",
12666 virtual_dwo_name.c_str ());
12668 dwo_file = OBSTACK_ZALLOC (&objfile->objfile_obstack, struct dwo_file);
12670 = (const char *) obstack_copy0 (&objfile->objfile_obstack,
12671 virtual_dwo_name.c_str (),
12672 virtual_dwo_name.size ());
12673 dwo_file->comp_dir = comp_dir;
12674 dwo_file->sections.abbrev =
12675 create_dwp_v2_section (dwarf2_per_objfile, &dwp_file->sections.abbrev,
12676 sections.abbrev_offset, sections.abbrev_size);
12677 dwo_file->sections.line =
12678 create_dwp_v2_section (dwarf2_per_objfile, &dwp_file->sections.line,
12679 sections.line_offset, sections.line_size);
12680 dwo_file->sections.loc =
12681 create_dwp_v2_section (dwarf2_per_objfile, &dwp_file->sections.loc,
12682 sections.loc_offset, sections.loc_size);
12683 dwo_file->sections.macinfo =
12684 create_dwp_v2_section (dwarf2_per_objfile, &dwp_file->sections.macinfo,
12685 sections.macinfo_offset, sections.macinfo_size);
12686 dwo_file->sections.macro =
12687 create_dwp_v2_section (dwarf2_per_objfile, &dwp_file->sections.macro,
12688 sections.macro_offset, sections.macro_size);
12689 dwo_file->sections.str_offsets =
12690 create_dwp_v2_section (dwarf2_per_objfile,
12691 &dwp_file->sections.str_offsets,
12692 sections.str_offsets_offset,
12693 sections.str_offsets_size);
12694 /* The "str" section is global to the entire DWP file. */
12695 dwo_file->sections.str = dwp_file->sections.str;
12696 /* The info or types section is assigned below to dwo_unit,
12697 there's no need to record it in dwo_file.
12698 Also, we can't simply record type sections in dwo_file because
12699 we record a pointer into the vector in dwo_unit. As we collect more
12700 types we'll grow the vector and eventually have to reallocate space
12701 for it, invalidating all copies of pointers into the previous
12703 *dwo_file_slot = dwo_file;
12707 if (dwarf_read_debug)
12709 fprintf_unfiltered (gdb_stdlog, "Using existing virtual DWO: %s\n",
12710 virtual_dwo_name.c_str ());
12712 dwo_file = (struct dwo_file *) *dwo_file_slot;
12715 dwo_unit = OBSTACK_ZALLOC (&objfile->objfile_obstack, struct dwo_unit);
12716 dwo_unit->dwo_file = dwo_file;
12717 dwo_unit->signature = signature;
12718 dwo_unit->section =
12719 XOBNEW (&objfile->objfile_obstack, struct dwarf2_section_info);
12720 *dwo_unit->section = create_dwp_v2_section (dwarf2_per_objfile,
12722 ? &dwp_file->sections.types
12723 : &dwp_file->sections.info,
12724 sections.info_or_types_offset,
12725 sections.info_or_types_size);
12726 /* dwo_unit->{offset,length,type_offset_in_tu} are set later. */
12731 /* Lookup the DWO unit with SIGNATURE in DWP_FILE.
12732 Returns NULL if the signature isn't found. */
12734 static struct dwo_unit *
12735 lookup_dwo_unit_in_dwp (struct dwarf2_per_objfile *dwarf2_per_objfile,
12736 struct dwp_file *dwp_file, const char *comp_dir,
12737 ULONGEST signature, int is_debug_types)
12739 const struct dwp_hash_table *dwp_htab =
12740 is_debug_types ? dwp_file->tus : dwp_file->cus;
12741 bfd *dbfd = dwp_file->dbfd.get ();
12742 uint32_t mask = dwp_htab->nr_slots - 1;
12743 uint32_t hash = signature & mask;
12744 uint32_t hash2 = ((signature >> 32) & mask) | 1;
12747 struct dwo_unit find_dwo_cu;
12749 memset (&find_dwo_cu, 0, sizeof (find_dwo_cu));
12750 find_dwo_cu.signature = signature;
12751 slot = htab_find_slot (is_debug_types
12752 ? dwp_file->loaded_tus
12753 : dwp_file->loaded_cus,
12754 &find_dwo_cu, INSERT);
12757 return (struct dwo_unit *) *slot;
12759 /* Use a for loop so that we don't loop forever on bad debug info. */
12760 for (i = 0; i < dwp_htab->nr_slots; ++i)
12762 ULONGEST signature_in_table;
12764 signature_in_table =
12765 read_8_bytes (dbfd, dwp_htab->hash_table + hash * sizeof (uint64_t));
12766 if (signature_in_table == signature)
12768 uint32_t unit_index =
12769 read_4_bytes (dbfd,
12770 dwp_htab->unit_table + hash * sizeof (uint32_t));
12772 if (dwp_file->version == 1)
12774 *slot = create_dwo_unit_in_dwp_v1 (dwarf2_per_objfile,
12775 dwp_file, unit_index,
12776 comp_dir, signature,
12781 *slot = create_dwo_unit_in_dwp_v2 (dwarf2_per_objfile,
12782 dwp_file, unit_index,
12783 comp_dir, signature,
12786 return (struct dwo_unit *) *slot;
12788 if (signature_in_table == 0)
12790 hash = (hash + hash2) & mask;
12793 error (_("Dwarf Error: bad DWP hash table, lookup didn't terminate"
12794 " [in module %s]"),
12798 /* Subroutine of open_dwo_file,open_dwp_file to simplify them.
12799 Open the file specified by FILE_NAME and hand it off to BFD for
12800 preliminary analysis. Return a newly initialized bfd *, which
12801 includes a canonicalized copy of FILE_NAME.
12802 If IS_DWP is TRUE, we're opening a DWP file, otherwise a DWO file.
12803 SEARCH_CWD is true if the current directory is to be searched.
12804 It will be searched before debug-file-directory.
12805 If successful, the file is added to the bfd include table of the
12806 objfile's bfd (see gdb_bfd_record_inclusion).
12807 If unable to find/open the file, return NULL.
12808 NOTE: This function is derived from symfile_bfd_open. */
12810 static gdb_bfd_ref_ptr
12811 try_open_dwop_file (struct dwarf2_per_objfile *dwarf2_per_objfile,
12812 const char *file_name, int is_dwp, int search_cwd)
12815 /* Blech. OPF_TRY_CWD_FIRST also disables searching the path list if
12816 FILE_NAME contains a '/'. So we can't use it. Instead prepend "."
12817 to debug_file_directory. */
12818 const char *search_path;
12819 static const char dirname_separator_string[] = { DIRNAME_SEPARATOR, '\0' };
12821 gdb::unique_xmalloc_ptr<char> search_path_holder;
12824 if (*debug_file_directory != '\0')
12826 search_path_holder.reset (concat (".", dirname_separator_string,
12827 debug_file_directory,
12829 search_path = search_path_holder.get ();
12835 search_path = debug_file_directory;
12837 openp_flags flags = OPF_RETURN_REALPATH;
12839 flags |= OPF_SEARCH_IN_PATH;
12841 gdb::unique_xmalloc_ptr<char> absolute_name;
12842 desc = openp (search_path, flags, file_name,
12843 O_RDONLY | O_BINARY, &absolute_name);
12847 gdb_bfd_ref_ptr sym_bfd (gdb_bfd_open (absolute_name.get (),
12849 if (sym_bfd == NULL)
12851 bfd_set_cacheable (sym_bfd.get (), 1);
12853 if (!bfd_check_format (sym_bfd.get (), bfd_object))
12856 /* Success. Record the bfd as having been included by the objfile's bfd.
12857 This is important because things like demangled_names_hash lives in the
12858 objfile's per_bfd space and may have references to things like symbol
12859 names that live in the DWO/DWP file's per_bfd space. PR 16426. */
12860 gdb_bfd_record_inclusion (dwarf2_per_objfile->objfile->obfd, sym_bfd.get ());
12865 /* Try to open DWO file FILE_NAME.
12866 COMP_DIR is the DW_AT_comp_dir attribute.
12867 The result is the bfd handle of the file.
12868 If there is a problem finding or opening the file, return NULL.
12869 Upon success, the canonicalized path of the file is stored in the bfd,
12870 same as symfile_bfd_open. */
12872 static gdb_bfd_ref_ptr
12873 open_dwo_file (struct dwarf2_per_objfile *dwarf2_per_objfile,
12874 const char *file_name, const char *comp_dir)
12876 if (IS_ABSOLUTE_PATH (file_name))
12877 return try_open_dwop_file (dwarf2_per_objfile, file_name,
12878 0 /*is_dwp*/, 0 /*search_cwd*/);
12880 /* Before trying the search path, try DWO_NAME in COMP_DIR. */
12882 if (comp_dir != NULL)
12884 char *path_to_try = concat (comp_dir, SLASH_STRING,
12885 file_name, (char *) NULL);
12887 /* NOTE: If comp_dir is a relative path, this will also try the
12888 search path, which seems useful. */
12889 gdb_bfd_ref_ptr abfd (try_open_dwop_file (dwarf2_per_objfile,
12892 1 /*search_cwd*/));
12893 xfree (path_to_try);
12898 /* That didn't work, try debug-file-directory, which, despite its name,
12899 is a list of paths. */
12901 if (*debug_file_directory == '\0')
12904 return try_open_dwop_file (dwarf2_per_objfile, file_name,
12905 0 /*is_dwp*/, 1 /*search_cwd*/);
12908 /* This function is mapped across the sections and remembers the offset and
12909 size of each of the DWO debugging sections we are interested in. */
12912 dwarf2_locate_dwo_sections (bfd *abfd, asection *sectp, void *dwo_sections_ptr)
12914 struct dwo_sections *dwo_sections = (struct dwo_sections *) dwo_sections_ptr;
12915 const struct dwop_section_names *names = &dwop_section_names;
12917 if (section_is_p (sectp->name, &names->abbrev_dwo))
12919 dwo_sections->abbrev.s.section = sectp;
12920 dwo_sections->abbrev.size = bfd_get_section_size (sectp);
12922 else if (section_is_p (sectp->name, &names->info_dwo))
12924 dwo_sections->info.s.section = sectp;
12925 dwo_sections->info.size = bfd_get_section_size (sectp);
12927 else if (section_is_p (sectp->name, &names->line_dwo))
12929 dwo_sections->line.s.section = sectp;
12930 dwo_sections->line.size = bfd_get_section_size (sectp);
12932 else if (section_is_p (sectp->name, &names->loc_dwo))
12934 dwo_sections->loc.s.section = sectp;
12935 dwo_sections->loc.size = bfd_get_section_size (sectp);
12937 else if (section_is_p (sectp->name, &names->macinfo_dwo))
12939 dwo_sections->macinfo.s.section = sectp;
12940 dwo_sections->macinfo.size = bfd_get_section_size (sectp);
12942 else if (section_is_p (sectp->name, &names->macro_dwo))
12944 dwo_sections->macro.s.section = sectp;
12945 dwo_sections->macro.size = bfd_get_section_size (sectp);
12947 else if (section_is_p (sectp->name, &names->str_dwo))
12949 dwo_sections->str.s.section = sectp;
12950 dwo_sections->str.size = bfd_get_section_size (sectp);
12952 else if (section_is_p (sectp->name, &names->str_offsets_dwo))
12954 dwo_sections->str_offsets.s.section = sectp;
12955 dwo_sections->str_offsets.size = bfd_get_section_size (sectp);
12957 else if (section_is_p (sectp->name, &names->types_dwo))
12959 struct dwarf2_section_info type_section;
12961 memset (&type_section, 0, sizeof (type_section));
12962 type_section.s.section = sectp;
12963 type_section.size = bfd_get_section_size (sectp);
12964 VEC_safe_push (dwarf2_section_info_def, dwo_sections->types,
12969 /* Initialize the use of the DWO file specified by DWO_NAME and referenced
12970 by PER_CU. This is for the non-DWP case.
12971 The result is NULL if DWO_NAME can't be found. */
12973 static struct dwo_file *
12974 open_and_init_dwo_file (struct dwarf2_per_cu_data *per_cu,
12975 const char *dwo_name, const char *comp_dir)
12977 struct dwarf2_per_objfile *dwarf2_per_objfile = per_cu->dwarf2_per_objfile;
12978 struct objfile *objfile = dwarf2_per_objfile->objfile;
12980 gdb_bfd_ref_ptr dbfd (open_dwo_file (dwarf2_per_objfile, dwo_name, comp_dir));
12983 if (dwarf_read_debug)
12984 fprintf_unfiltered (gdb_stdlog, "DWO file not found: %s\n", dwo_name);
12988 /* We use a unique pointer here, despite the obstack allocation,
12989 because a dwo_file needs some cleanup if it is abandoned. */
12990 dwo_file_up dwo_file (OBSTACK_ZALLOC (&objfile->objfile_obstack,
12992 dwo_file->dwo_name = dwo_name;
12993 dwo_file->comp_dir = comp_dir;
12994 dwo_file->dbfd = dbfd.release ();
12996 bfd_map_over_sections (dwo_file->dbfd, dwarf2_locate_dwo_sections,
12997 &dwo_file->sections);
12999 create_cus_hash_table (dwarf2_per_objfile, *dwo_file, dwo_file->sections.info,
13002 create_debug_types_hash_table (dwarf2_per_objfile, dwo_file.get (),
13003 dwo_file->sections.types, dwo_file->tus);
13005 if (dwarf_read_debug)
13006 fprintf_unfiltered (gdb_stdlog, "DWO file found: %s\n", dwo_name);
13008 return dwo_file.release ();
13011 /* This function is mapped across the sections and remembers the offset and
13012 size of each of the DWP debugging sections common to version 1 and 2 that
13013 we are interested in. */
13016 dwarf2_locate_common_dwp_sections (bfd *abfd, asection *sectp,
13017 void *dwp_file_ptr)
13019 struct dwp_file *dwp_file = (struct dwp_file *) dwp_file_ptr;
13020 const struct dwop_section_names *names = &dwop_section_names;
13021 unsigned int elf_section_nr = elf_section_data (sectp)->this_idx;
13023 /* Record the ELF section number for later lookup: this is what the
13024 .debug_cu_index,.debug_tu_index tables use in DWP V1. */
13025 gdb_assert (elf_section_nr < dwp_file->num_sections);
13026 dwp_file->elf_sections[elf_section_nr] = sectp;
13028 /* Look for specific sections that we need. */
13029 if (section_is_p (sectp->name, &names->str_dwo))
13031 dwp_file->sections.str.s.section = sectp;
13032 dwp_file->sections.str.size = bfd_get_section_size (sectp);
13034 else if (section_is_p (sectp->name, &names->cu_index))
13036 dwp_file->sections.cu_index.s.section = sectp;
13037 dwp_file->sections.cu_index.size = bfd_get_section_size (sectp);
13039 else if (section_is_p (sectp->name, &names->tu_index))
13041 dwp_file->sections.tu_index.s.section = sectp;
13042 dwp_file->sections.tu_index.size = bfd_get_section_size (sectp);
13046 /* This function is mapped across the sections and remembers the offset and
13047 size of each of the DWP version 2 debugging sections that we are interested
13048 in. This is split into a separate function because we don't know if we
13049 have version 1 or 2 until we parse the cu_index/tu_index sections. */
13052 dwarf2_locate_v2_dwp_sections (bfd *abfd, asection *sectp, void *dwp_file_ptr)
13054 struct dwp_file *dwp_file = (struct dwp_file *) dwp_file_ptr;
13055 const struct dwop_section_names *names = &dwop_section_names;
13056 unsigned int elf_section_nr = elf_section_data (sectp)->this_idx;
13058 /* Record the ELF section number for later lookup: this is what the
13059 .debug_cu_index,.debug_tu_index tables use in DWP V1. */
13060 gdb_assert (elf_section_nr < dwp_file->num_sections);
13061 dwp_file->elf_sections[elf_section_nr] = sectp;
13063 /* Look for specific sections that we need. */
13064 if (section_is_p (sectp->name, &names->abbrev_dwo))
13066 dwp_file->sections.abbrev.s.section = sectp;
13067 dwp_file->sections.abbrev.size = bfd_get_section_size (sectp);
13069 else if (section_is_p (sectp->name, &names->info_dwo))
13071 dwp_file->sections.info.s.section = sectp;
13072 dwp_file->sections.info.size = bfd_get_section_size (sectp);
13074 else if (section_is_p (sectp->name, &names->line_dwo))
13076 dwp_file->sections.line.s.section = sectp;
13077 dwp_file->sections.line.size = bfd_get_section_size (sectp);
13079 else if (section_is_p (sectp->name, &names->loc_dwo))
13081 dwp_file->sections.loc.s.section = sectp;
13082 dwp_file->sections.loc.size = bfd_get_section_size (sectp);
13084 else if (section_is_p (sectp->name, &names->macinfo_dwo))
13086 dwp_file->sections.macinfo.s.section = sectp;
13087 dwp_file->sections.macinfo.size = bfd_get_section_size (sectp);
13089 else if (section_is_p (sectp->name, &names->macro_dwo))
13091 dwp_file->sections.macro.s.section = sectp;
13092 dwp_file->sections.macro.size = bfd_get_section_size (sectp);
13094 else if (section_is_p (sectp->name, &names->str_offsets_dwo))
13096 dwp_file->sections.str_offsets.s.section = sectp;
13097 dwp_file->sections.str_offsets.size = bfd_get_section_size (sectp);
13099 else if (section_is_p (sectp->name, &names->types_dwo))
13101 dwp_file->sections.types.s.section = sectp;
13102 dwp_file->sections.types.size = bfd_get_section_size (sectp);
13106 /* Hash function for dwp_file loaded CUs/TUs. */
13109 hash_dwp_loaded_cutus (const void *item)
13111 const struct dwo_unit *dwo_unit = (const struct dwo_unit *) item;
13113 /* This drops the top 32 bits of the signature, but is ok for a hash. */
13114 return dwo_unit->signature;
13117 /* Equality function for dwp_file loaded CUs/TUs. */
13120 eq_dwp_loaded_cutus (const void *a, const void *b)
13122 const struct dwo_unit *dua = (const struct dwo_unit *) a;
13123 const struct dwo_unit *dub = (const struct dwo_unit *) b;
13125 return dua->signature == dub->signature;
13128 /* Allocate a hash table for dwp_file loaded CUs/TUs. */
13131 allocate_dwp_loaded_cutus_table (struct objfile *objfile)
13133 return htab_create_alloc_ex (3,
13134 hash_dwp_loaded_cutus,
13135 eq_dwp_loaded_cutus,
13137 &objfile->objfile_obstack,
13138 hashtab_obstack_allocate,
13139 dummy_obstack_deallocate);
13142 /* Try to open DWP file FILE_NAME.
13143 The result is the bfd handle of the file.
13144 If there is a problem finding or opening the file, return NULL.
13145 Upon success, the canonicalized path of the file is stored in the bfd,
13146 same as symfile_bfd_open. */
13148 static gdb_bfd_ref_ptr
13149 open_dwp_file (struct dwarf2_per_objfile *dwarf2_per_objfile,
13150 const char *file_name)
13152 gdb_bfd_ref_ptr abfd (try_open_dwop_file (dwarf2_per_objfile, file_name,
13154 1 /*search_cwd*/));
13158 /* Work around upstream bug 15652.
13159 http://sourceware.org/bugzilla/show_bug.cgi?id=15652
13160 [Whether that's a "bug" is debatable, but it is getting in our way.]
13161 We have no real idea where the dwp file is, because gdb's realpath-ing
13162 of the executable's path may have discarded the needed info.
13163 [IWBN if the dwp file name was recorded in the executable, akin to
13164 .gnu_debuglink, but that doesn't exist yet.]
13165 Strip the directory from FILE_NAME and search again. */
13166 if (*debug_file_directory != '\0')
13168 /* Don't implicitly search the current directory here.
13169 If the user wants to search "." to handle this case,
13170 it must be added to debug-file-directory. */
13171 return try_open_dwop_file (dwarf2_per_objfile,
13172 lbasename (file_name), 1 /*is_dwp*/,
13179 /* Initialize the use of the DWP file for the current objfile.
13180 By convention the name of the DWP file is ${objfile}.dwp.
13181 The result is NULL if it can't be found. */
13183 static std::unique_ptr<struct dwp_file>
13184 open_and_init_dwp_file (struct dwarf2_per_objfile *dwarf2_per_objfile)
13186 struct objfile *objfile = dwarf2_per_objfile->objfile;
13188 /* Try to find first .dwp for the binary file before any symbolic links
13191 /* If the objfile is a debug file, find the name of the real binary
13192 file and get the name of dwp file from there. */
13193 std::string dwp_name;
13194 if (objfile->separate_debug_objfile_backlink != NULL)
13196 struct objfile *backlink = objfile->separate_debug_objfile_backlink;
13197 const char *backlink_basename = lbasename (backlink->original_name);
13199 dwp_name = ldirname (objfile->original_name) + SLASH_STRING + backlink_basename;
13202 dwp_name = objfile->original_name;
13204 dwp_name += ".dwp";
13206 gdb_bfd_ref_ptr dbfd (open_dwp_file (dwarf2_per_objfile, dwp_name.c_str ()));
13208 && strcmp (objfile->original_name, objfile_name (objfile)) != 0)
13210 /* Try to find .dwp for the binary file after gdb_realpath resolving. */
13211 dwp_name = objfile_name (objfile);
13212 dwp_name += ".dwp";
13213 dbfd = open_dwp_file (dwarf2_per_objfile, dwp_name.c_str ());
13218 if (dwarf_read_debug)
13219 fprintf_unfiltered (gdb_stdlog, "DWP file not found: %s\n", dwp_name.c_str ());
13220 return std::unique_ptr<dwp_file> ();
13223 const char *name = bfd_get_filename (dbfd.get ());
13224 std::unique_ptr<struct dwp_file> dwp_file
13225 (new struct dwp_file (name, std::move (dbfd)));
13227 dwp_file->num_sections = elf_numsections (dwp_file->dbfd);
13228 dwp_file->elf_sections =
13229 OBSTACK_CALLOC (&objfile->objfile_obstack,
13230 dwp_file->num_sections, asection *);
13232 bfd_map_over_sections (dwp_file->dbfd.get (),
13233 dwarf2_locate_common_dwp_sections,
13236 dwp_file->cus = create_dwp_hash_table (dwarf2_per_objfile, dwp_file.get (),
13239 dwp_file->tus = create_dwp_hash_table (dwarf2_per_objfile, dwp_file.get (),
13242 /* The DWP file version is stored in the hash table. Oh well. */
13243 if (dwp_file->cus && dwp_file->tus
13244 && dwp_file->cus->version != dwp_file->tus->version)
13246 /* Technically speaking, we should try to limp along, but this is
13247 pretty bizarre. We use pulongest here because that's the established
13248 portability solution (e.g, we cannot use %u for uint32_t). */
13249 error (_("Dwarf Error: DWP file CU version %s doesn't match"
13250 " TU version %s [in DWP file %s]"),
13251 pulongest (dwp_file->cus->version),
13252 pulongest (dwp_file->tus->version), dwp_name.c_str ());
13256 dwp_file->version = dwp_file->cus->version;
13257 else if (dwp_file->tus)
13258 dwp_file->version = dwp_file->tus->version;
13260 dwp_file->version = 2;
13262 if (dwp_file->version == 2)
13263 bfd_map_over_sections (dwp_file->dbfd.get (),
13264 dwarf2_locate_v2_dwp_sections,
13267 dwp_file->loaded_cus = allocate_dwp_loaded_cutus_table (objfile);
13268 dwp_file->loaded_tus = allocate_dwp_loaded_cutus_table (objfile);
13270 if (dwarf_read_debug)
13272 fprintf_unfiltered (gdb_stdlog, "DWP file found: %s\n", dwp_file->name);
13273 fprintf_unfiltered (gdb_stdlog,
13274 " %s CUs, %s TUs\n",
13275 pulongest (dwp_file->cus ? dwp_file->cus->nr_units : 0),
13276 pulongest (dwp_file->tus ? dwp_file->tus->nr_units : 0));
13282 /* Wrapper around open_and_init_dwp_file, only open it once. */
13284 static struct dwp_file *
13285 get_dwp_file (struct dwarf2_per_objfile *dwarf2_per_objfile)
13287 if (! dwarf2_per_objfile->dwp_checked)
13289 dwarf2_per_objfile->dwp_file
13290 = open_and_init_dwp_file (dwarf2_per_objfile);
13291 dwarf2_per_objfile->dwp_checked = 1;
13293 return dwarf2_per_objfile->dwp_file.get ();
13296 /* Subroutine of lookup_dwo_comp_unit, lookup_dwo_type_unit.
13297 Look up the CU/TU with signature SIGNATURE, either in DWO file DWO_NAME
13298 or in the DWP file for the objfile, referenced by THIS_UNIT.
13299 If non-NULL, comp_dir is the DW_AT_comp_dir attribute.
13300 IS_DEBUG_TYPES is non-zero if reading a TU, otherwise read a CU.
13302 This is called, for example, when wanting to read a variable with a
13303 complex location. Therefore we don't want to do file i/o for every call.
13304 Therefore we don't want to look for a DWO file on every call.
13305 Therefore we first see if we've already seen SIGNATURE in a DWP file,
13306 then we check if we've already seen DWO_NAME, and only THEN do we check
13309 The result is a pointer to the dwo_unit object or NULL if we didn't find it
13310 (dwo_id mismatch or couldn't find the DWO/DWP file). */
13312 static struct dwo_unit *
13313 lookup_dwo_cutu (struct dwarf2_per_cu_data *this_unit,
13314 const char *dwo_name, const char *comp_dir,
13315 ULONGEST signature, int is_debug_types)
13317 struct dwarf2_per_objfile *dwarf2_per_objfile = this_unit->dwarf2_per_objfile;
13318 struct objfile *objfile = dwarf2_per_objfile->objfile;
13319 const char *kind = is_debug_types ? "TU" : "CU";
13320 void **dwo_file_slot;
13321 struct dwo_file *dwo_file;
13322 struct dwp_file *dwp_file;
13324 /* First see if there's a DWP file.
13325 If we have a DWP file but didn't find the DWO inside it, don't
13326 look for the original DWO file. It makes gdb behave differently
13327 depending on whether one is debugging in the build tree. */
13329 dwp_file = get_dwp_file (dwarf2_per_objfile);
13330 if (dwp_file != NULL)
13332 const struct dwp_hash_table *dwp_htab =
13333 is_debug_types ? dwp_file->tus : dwp_file->cus;
13335 if (dwp_htab != NULL)
13337 struct dwo_unit *dwo_cutu =
13338 lookup_dwo_unit_in_dwp (dwarf2_per_objfile, dwp_file, comp_dir,
13339 signature, is_debug_types);
13341 if (dwo_cutu != NULL)
13343 if (dwarf_read_debug)
13345 fprintf_unfiltered (gdb_stdlog,
13346 "Virtual DWO %s %s found: @%s\n",
13347 kind, hex_string (signature),
13348 host_address_to_string (dwo_cutu));
13356 /* No DWP file, look for the DWO file. */
13358 dwo_file_slot = lookup_dwo_file_slot (dwarf2_per_objfile,
13359 dwo_name, comp_dir);
13360 if (*dwo_file_slot == NULL)
13362 /* Read in the file and build a table of the CUs/TUs it contains. */
13363 *dwo_file_slot = open_and_init_dwo_file (this_unit, dwo_name, comp_dir);
13365 /* NOTE: This will be NULL if unable to open the file. */
13366 dwo_file = (struct dwo_file *) *dwo_file_slot;
13368 if (dwo_file != NULL)
13370 struct dwo_unit *dwo_cutu = NULL;
13372 if (is_debug_types && dwo_file->tus)
13374 struct dwo_unit find_dwo_cutu;
13376 memset (&find_dwo_cutu, 0, sizeof (find_dwo_cutu));
13377 find_dwo_cutu.signature = signature;
13379 = (struct dwo_unit *) htab_find (dwo_file->tus, &find_dwo_cutu);
13381 else if (!is_debug_types && dwo_file->cus)
13383 struct dwo_unit find_dwo_cutu;
13385 memset (&find_dwo_cutu, 0, sizeof (find_dwo_cutu));
13386 find_dwo_cutu.signature = signature;
13387 dwo_cutu = (struct dwo_unit *)htab_find (dwo_file->cus,
13391 if (dwo_cutu != NULL)
13393 if (dwarf_read_debug)
13395 fprintf_unfiltered (gdb_stdlog, "DWO %s %s(%s) found: @%s\n",
13396 kind, dwo_name, hex_string (signature),
13397 host_address_to_string (dwo_cutu));
13404 /* We didn't find it. This could mean a dwo_id mismatch, or
13405 someone deleted the DWO/DWP file, or the search path isn't set up
13406 correctly to find the file. */
13408 if (dwarf_read_debug)
13410 fprintf_unfiltered (gdb_stdlog, "DWO %s %s(%s) not found\n",
13411 kind, dwo_name, hex_string (signature));
13414 /* This is a warning and not a complaint because it can be caused by
13415 pilot error (e.g., user accidentally deleting the DWO). */
13417 /* Print the name of the DWP file if we looked there, helps the user
13418 better diagnose the problem. */
13419 std::string dwp_text;
13421 if (dwp_file != NULL)
13422 dwp_text = string_printf (" [in DWP file %s]",
13423 lbasename (dwp_file->name));
13425 warning (_("Could not find DWO %s %s(%s)%s referenced by %s at offset %s"
13426 " [in module %s]"),
13427 kind, dwo_name, hex_string (signature),
13429 this_unit->is_debug_types ? "TU" : "CU",
13430 sect_offset_str (this_unit->sect_off), objfile_name (objfile));
13435 /* Lookup the DWO CU DWO_NAME/SIGNATURE referenced from THIS_CU.
13436 See lookup_dwo_cutu_unit for details. */
13438 static struct dwo_unit *
13439 lookup_dwo_comp_unit (struct dwarf2_per_cu_data *this_cu,
13440 const char *dwo_name, const char *comp_dir,
13441 ULONGEST signature)
13443 return lookup_dwo_cutu (this_cu, dwo_name, comp_dir, signature, 0);
13446 /* Lookup the DWO TU DWO_NAME/SIGNATURE referenced from THIS_TU.
13447 See lookup_dwo_cutu_unit for details. */
13449 static struct dwo_unit *
13450 lookup_dwo_type_unit (struct signatured_type *this_tu,
13451 const char *dwo_name, const char *comp_dir)
13453 return lookup_dwo_cutu (&this_tu->per_cu, dwo_name, comp_dir, this_tu->signature, 1);
13456 /* Traversal function for queue_and_load_all_dwo_tus. */
13459 queue_and_load_dwo_tu (void **slot, void *info)
13461 struct dwo_unit *dwo_unit = (struct dwo_unit *) *slot;
13462 struct dwarf2_per_cu_data *per_cu = (struct dwarf2_per_cu_data *) info;
13463 ULONGEST signature = dwo_unit->signature;
13464 struct signatured_type *sig_type =
13465 lookup_dwo_signatured_type (per_cu->cu, signature);
13467 if (sig_type != NULL)
13469 struct dwarf2_per_cu_data *sig_cu = &sig_type->per_cu;
13471 /* We pass NULL for DEPENDENT_CU because we don't yet know if there's
13472 a real dependency of PER_CU on SIG_TYPE. That is detected later
13473 while processing PER_CU. */
13474 if (maybe_queue_comp_unit (NULL, sig_cu, per_cu->cu->language))
13475 load_full_type_unit (sig_cu);
13476 VEC_safe_push (dwarf2_per_cu_ptr, per_cu->imported_symtabs, sig_cu);
13482 /* Queue all TUs contained in the DWO of PER_CU to be read in.
13483 The DWO may have the only definition of the type, though it may not be
13484 referenced anywhere in PER_CU. Thus we have to load *all* its TUs.
13485 http://sourceware.org/bugzilla/show_bug.cgi?id=15021 */
13488 queue_and_load_all_dwo_tus (struct dwarf2_per_cu_data *per_cu)
13490 struct dwo_unit *dwo_unit;
13491 struct dwo_file *dwo_file;
13493 gdb_assert (!per_cu->is_debug_types);
13494 gdb_assert (get_dwp_file (per_cu->dwarf2_per_objfile) == NULL);
13495 gdb_assert (per_cu->cu != NULL);
13497 dwo_unit = per_cu->cu->dwo_unit;
13498 gdb_assert (dwo_unit != NULL);
13500 dwo_file = dwo_unit->dwo_file;
13501 if (dwo_file->tus != NULL)
13502 htab_traverse_noresize (dwo_file->tus, queue_and_load_dwo_tu, per_cu);
13505 /* Free all resources associated with DWO_FILE.
13506 Close the DWO file and munmap the sections. */
13509 free_dwo_file (struct dwo_file *dwo_file)
13511 /* Note: dbfd is NULL for virtual DWO files. */
13512 gdb_bfd_unref (dwo_file->dbfd);
13514 VEC_free (dwarf2_section_info_def, dwo_file->sections.types);
13517 /* Traversal function for free_dwo_files. */
13520 free_dwo_file_from_slot (void **slot, void *info)
13522 struct dwo_file *dwo_file = (struct dwo_file *) *slot;
13524 free_dwo_file (dwo_file);
13529 /* Free all resources associated with DWO_FILES. */
13532 free_dwo_files (htab_t dwo_files, struct objfile *objfile)
13534 htab_traverse_noresize (dwo_files, free_dwo_file_from_slot, objfile);
13537 /* Read in various DIEs. */
13539 /* DW_AT_abstract_origin inherits whole DIEs (not just their attributes).
13540 Inherit only the children of the DW_AT_abstract_origin DIE not being
13541 already referenced by DW_AT_abstract_origin from the children of the
13545 inherit_abstract_dies (struct die_info *die, struct dwarf2_cu *cu)
13547 struct die_info *child_die;
13548 sect_offset *offsetp;
13549 /* Parent of DIE - referenced by DW_AT_abstract_origin. */
13550 struct die_info *origin_die;
13551 /* Iterator of the ORIGIN_DIE children. */
13552 struct die_info *origin_child_die;
13553 struct attribute *attr;
13554 struct dwarf2_cu *origin_cu;
13555 struct pending **origin_previous_list_in_scope;
13557 attr = dwarf2_attr (die, DW_AT_abstract_origin, cu);
13561 /* Note that following die references may follow to a die in a
13565 origin_die = follow_die_ref (die, attr, &origin_cu);
13567 /* We're inheriting ORIGIN's children into the scope we'd put DIE's
13569 origin_previous_list_in_scope = origin_cu->list_in_scope;
13570 origin_cu->list_in_scope = cu->list_in_scope;
13572 if (die->tag != origin_die->tag
13573 && !(die->tag == DW_TAG_inlined_subroutine
13574 && origin_die->tag == DW_TAG_subprogram))
13575 complaint (_("DIE %s and its abstract origin %s have different tags"),
13576 sect_offset_str (die->sect_off),
13577 sect_offset_str (origin_die->sect_off));
13579 std::vector<sect_offset> offsets;
13581 for (child_die = die->child;
13582 child_die && child_die->tag;
13583 child_die = sibling_die (child_die))
13585 struct die_info *child_origin_die;
13586 struct dwarf2_cu *child_origin_cu;
13588 /* We are trying to process concrete instance entries:
13589 DW_TAG_call_site DIEs indeed have a DW_AT_abstract_origin tag, but
13590 it's not relevant to our analysis here. i.e. detecting DIEs that are
13591 present in the abstract instance but not referenced in the concrete
13593 if (child_die->tag == DW_TAG_call_site
13594 || child_die->tag == DW_TAG_GNU_call_site)
13597 /* For each CHILD_DIE, find the corresponding child of
13598 ORIGIN_DIE. If there is more than one layer of
13599 DW_AT_abstract_origin, follow them all; there shouldn't be,
13600 but GCC versions at least through 4.4 generate this (GCC PR
13602 child_origin_die = child_die;
13603 child_origin_cu = cu;
13606 attr = dwarf2_attr (child_origin_die, DW_AT_abstract_origin,
13610 child_origin_die = follow_die_ref (child_origin_die, attr,
13614 /* According to DWARF3 3.3.8.2 #3 new entries without their abstract
13615 counterpart may exist. */
13616 if (child_origin_die != child_die)
13618 if (child_die->tag != child_origin_die->tag
13619 && !(child_die->tag == DW_TAG_inlined_subroutine
13620 && child_origin_die->tag == DW_TAG_subprogram))
13621 complaint (_("Child DIE %s and its abstract origin %s have "
13623 sect_offset_str (child_die->sect_off),
13624 sect_offset_str (child_origin_die->sect_off));
13625 if (child_origin_die->parent != origin_die)
13626 complaint (_("Child DIE %s and its abstract origin %s have "
13627 "different parents"),
13628 sect_offset_str (child_die->sect_off),
13629 sect_offset_str (child_origin_die->sect_off));
13631 offsets.push_back (child_origin_die->sect_off);
13634 std::sort (offsets.begin (), offsets.end ());
13635 sect_offset *offsets_end = offsets.data () + offsets.size ();
13636 for (offsetp = offsets.data () + 1; offsetp < offsets_end; offsetp++)
13637 if (offsetp[-1] == *offsetp)
13638 complaint (_("Multiple children of DIE %s refer "
13639 "to DIE %s as their abstract origin"),
13640 sect_offset_str (die->sect_off), sect_offset_str (*offsetp));
13642 offsetp = offsets.data ();
13643 origin_child_die = origin_die->child;
13644 while (origin_child_die && origin_child_die->tag)
13646 /* Is ORIGIN_CHILD_DIE referenced by any of the DIE children? */
13647 while (offsetp < offsets_end
13648 && *offsetp < origin_child_die->sect_off)
13650 if (offsetp >= offsets_end
13651 || *offsetp > origin_child_die->sect_off)
13653 /* Found that ORIGIN_CHILD_DIE is really not referenced.
13654 Check whether we're already processing ORIGIN_CHILD_DIE.
13655 This can happen with mutually referenced abstract_origins.
13657 if (!origin_child_die->in_process)
13658 process_die (origin_child_die, origin_cu);
13660 origin_child_die = sibling_die (origin_child_die);
13662 origin_cu->list_in_scope = origin_previous_list_in_scope;
13666 read_func_scope (struct die_info *die, struct dwarf2_cu *cu)
13668 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
13669 struct gdbarch *gdbarch = get_objfile_arch (objfile);
13670 struct context_stack *newobj;
13673 struct die_info *child_die;
13674 struct attribute *attr, *call_line, *call_file;
13676 CORE_ADDR baseaddr;
13677 struct block *block;
13678 int inlined_func = (die->tag == DW_TAG_inlined_subroutine);
13679 std::vector<struct symbol *> template_args;
13680 struct template_symbol *templ_func = NULL;
13684 /* If we do not have call site information, we can't show the
13685 caller of this inlined function. That's too confusing, so
13686 only use the scope for local variables. */
13687 call_line = dwarf2_attr (die, DW_AT_call_line, cu);
13688 call_file = dwarf2_attr (die, DW_AT_call_file, cu);
13689 if (call_line == NULL || call_file == NULL)
13691 read_lexical_block_scope (die, cu);
13696 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
13698 name = dwarf2_name (die, cu);
13700 /* Ignore functions with missing or empty names. These are actually
13701 illegal according to the DWARF standard. */
13704 complaint (_("missing name for subprogram DIE at %s"),
13705 sect_offset_str (die->sect_off));
13709 /* Ignore functions with missing or invalid low and high pc attributes. */
13710 if (dwarf2_get_pc_bounds (die, &lowpc, &highpc, cu, NULL)
13711 <= PC_BOUNDS_INVALID)
13713 attr = dwarf2_attr (die, DW_AT_external, cu);
13714 if (!attr || !DW_UNSND (attr))
13715 complaint (_("cannot get low and high bounds "
13716 "for subprogram DIE at %s"),
13717 sect_offset_str (die->sect_off));
13721 lowpc = gdbarch_adjust_dwarf2_addr (gdbarch, lowpc + baseaddr);
13722 highpc = gdbarch_adjust_dwarf2_addr (gdbarch, highpc + baseaddr);
13724 /* If we have any template arguments, then we must allocate a
13725 different sort of symbol. */
13726 for (child_die = die->child; child_die; child_die = sibling_die (child_die))
13728 if (child_die->tag == DW_TAG_template_type_param
13729 || child_die->tag == DW_TAG_template_value_param)
13731 templ_func = allocate_template_symbol (objfile);
13732 templ_func->subclass = SYMBOL_TEMPLATE;
13737 newobj = cu->get_builder ()->push_context (0, lowpc);
13738 newobj->name = new_symbol (die, read_type_die (die, cu), cu,
13739 (struct symbol *) templ_func);
13741 /* If there is a location expression for DW_AT_frame_base, record
13743 attr = dwarf2_attr (die, DW_AT_frame_base, cu);
13745 dwarf2_symbol_mark_computed (attr, newobj->name, cu, 1);
13747 /* If there is a location for the static link, record it. */
13748 newobj->static_link = NULL;
13749 attr = dwarf2_attr (die, DW_AT_static_link, cu);
13752 newobj->static_link
13753 = XOBNEW (&objfile->objfile_obstack, struct dynamic_prop);
13754 attr_to_dynamic_prop (attr, die, cu, newobj->static_link);
13757 cu->list_in_scope = cu->get_builder ()->get_local_symbols ();
13759 if (die->child != NULL)
13761 child_die = die->child;
13762 while (child_die && child_die->tag)
13764 if (child_die->tag == DW_TAG_template_type_param
13765 || child_die->tag == DW_TAG_template_value_param)
13767 struct symbol *arg = new_symbol (child_die, NULL, cu);
13770 template_args.push_back (arg);
13773 process_die (child_die, cu);
13774 child_die = sibling_die (child_die);
13778 inherit_abstract_dies (die, cu);
13780 /* If we have a DW_AT_specification, we might need to import using
13781 directives from the context of the specification DIE. See the
13782 comment in determine_prefix. */
13783 if (cu->language == language_cplus
13784 && dwarf2_attr (die, DW_AT_specification, cu))
13786 struct dwarf2_cu *spec_cu = cu;
13787 struct die_info *spec_die = die_specification (die, &spec_cu);
13791 child_die = spec_die->child;
13792 while (child_die && child_die->tag)
13794 if (child_die->tag == DW_TAG_imported_module)
13795 process_die (child_die, spec_cu);
13796 child_die = sibling_die (child_die);
13799 /* In some cases, GCC generates specification DIEs that
13800 themselves contain DW_AT_specification attributes. */
13801 spec_die = die_specification (spec_die, &spec_cu);
13805 struct context_stack cstk = cu->get_builder ()->pop_context ();
13806 /* Make a block for the local symbols within. */
13807 block = cu->get_builder ()->finish_block (cstk.name, cstk.old_blocks,
13808 cstk.static_link, lowpc, highpc);
13810 /* For C++, set the block's scope. */
13811 if ((cu->language == language_cplus
13812 || cu->language == language_fortran
13813 || cu->language == language_d
13814 || cu->language == language_rust)
13815 && cu->processing_has_namespace_info)
13816 block_set_scope (block, determine_prefix (die, cu),
13817 &objfile->objfile_obstack);
13819 /* If we have address ranges, record them. */
13820 dwarf2_record_block_ranges (die, block, baseaddr, cu);
13822 gdbarch_make_symbol_special (gdbarch, cstk.name, objfile);
13824 /* Attach template arguments to function. */
13825 if (!template_args.empty ())
13827 gdb_assert (templ_func != NULL);
13829 templ_func->n_template_arguments = template_args.size ();
13830 templ_func->template_arguments
13831 = XOBNEWVEC (&objfile->objfile_obstack, struct symbol *,
13832 templ_func->n_template_arguments);
13833 memcpy (templ_func->template_arguments,
13834 template_args.data (),
13835 (templ_func->n_template_arguments * sizeof (struct symbol *)));
13837 /* Make sure that the symtab is set on the new symbols. Even
13838 though they don't appear in this symtab directly, other parts
13839 of gdb assume that symbols do, and this is reasonably
13841 for (symbol *sym : template_args)
13842 symbol_set_symtab (sym, symbol_symtab (templ_func));
13845 /* In C++, we can have functions nested inside functions (e.g., when
13846 a function declares a class that has methods). This means that
13847 when we finish processing a function scope, we may need to go
13848 back to building a containing block's symbol lists. */
13849 *cu->get_builder ()->get_local_symbols () = cstk.locals;
13850 cu->get_builder ()->set_local_using_directives (cstk.local_using_directives);
13852 /* If we've finished processing a top-level function, subsequent
13853 symbols go in the file symbol list. */
13854 if (cu->get_builder ()->outermost_context_p ())
13855 cu->list_in_scope = cu->get_builder ()->get_file_symbols ();
13858 /* Process all the DIES contained within a lexical block scope. Start
13859 a new scope, process the dies, and then close the scope. */
13862 read_lexical_block_scope (struct die_info *die, struct dwarf2_cu *cu)
13864 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
13865 struct gdbarch *gdbarch = get_objfile_arch (objfile);
13866 CORE_ADDR lowpc, highpc;
13867 struct die_info *child_die;
13868 CORE_ADDR baseaddr;
13870 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
13872 /* Ignore blocks with missing or invalid low and high pc attributes. */
13873 /* ??? Perhaps consider discontiguous blocks defined by DW_AT_ranges
13874 as multiple lexical blocks? Handling children in a sane way would
13875 be nasty. Might be easier to properly extend generic blocks to
13876 describe ranges. */
13877 switch (dwarf2_get_pc_bounds (die, &lowpc, &highpc, cu, NULL))
13879 case PC_BOUNDS_NOT_PRESENT:
13880 /* DW_TAG_lexical_block has no attributes, process its children as if
13881 there was no wrapping by that DW_TAG_lexical_block.
13882 GCC does no longer produces such DWARF since GCC r224161. */
13883 for (child_die = die->child;
13884 child_die != NULL && child_die->tag;
13885 child_die = sibling_die (child_die))
13886 process_die (child_die, cu);
13888 case PC_BOUNDS_INVALID:
13891 lowpc = gdbarch_adjust_dwarf2_addr (gdbarch, lowpc + baseaddr);
13892 highpc = gdbarch_adjust_dwarf2_addr (gdbarch, highpc + baseaddr);
13894 cu->get_builder ()->push_context (0, lowpc);
13895 if (die->child != NULL)
13897 child_die = die->child;
13898 while (child_die && child_die->tag)
13900 process_die (child_die, cu);
13901 child_die = sibling_die (child_die);
13904 inherit_abstract_dies (die, cu);
13905 struct context_stack cstk = cu->get_builder ()->pop_context ();
13907 if (*cu->get_builder ()->get_local_symbols () != NULL
13908 || (*cu->get_builder ()->get_local_using_directives ()) != NULL)
13910 struct block *block
13911 = cu->get_builder ()->finish_block (0, cstk.old_blocks, NULL,
13912 cstk.start_addr, highpc);
13914 /* Note that recording ranges after traversing children, as we
13915 do here, means that recording a parent's ranges entails
13916 walking across all its children's ranges as they appear in
13917 the address map, which is quadratic behavior.
13919 It would be nicer to record the parent's ranges before
13920 traversing its children, simply overriding whatever you find
13921 there. But since we don't even decide whether to create a
13922 block until after we've traversed its children, that's hard
13924 dwarf2_record_block_ranges (die, block, baseaddr, cu);
13926 *cu->get_builder ()->get_local_symbols () = cstk.locals;
13927 cu->get_builder ()->set_local_using_directives (cstk.local_using_directives);
13930 /* Read in DW_TAG_call_site and insert it to CU->call_site_htab. */
13933 read_call_site_scope (struct die_info *die, struct dwarf2_cu *cu)
13935 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
13936 struct gdbarch *gdbarch = get_objfile_arch (objfile);
13937 CORE_ADDR pc, baseaddr;
13938 struct attribute *attr;
13939 struct call_site *call_site, call_site_local;
13942 struct die_info *child_die;
13944 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
13946 attr = dwarf2_attr (die, DW_AT_call_return_pc, cu);
13949 /* This was a pre-DWARF-5 GNU extension alias
13950 for DW_AT_call_return_pc. */
13951 attr = dwarf2_attr (die, DW_AT_low_pc, cu);
13955 complaint (_("missing DW_AT_call_return_pc for DW_TAG_call_site "
13956 "DIE %s [in module %s]"),
13957 sect_offset_str (die->sect_off), objfile_name (objfile));
13960 pc = attr_value_as_address (attr) + baseaddr;
13961 pc = gdbarch_adjust_dwarf2_addr (gdbarch, pc);
13963 if (cu->call_site_htab == NULL)
13964 cu->call_site_htab = htab_create_alloc_ex (16, core_addr_hash, core_addr_eq,
13965 NULL, &objfile->objfile_obstack,
13966 hashtab_obstack_allocate, NULL);
13967 call_site_local.pc = pc;
13968 slot = htab_find_slot (cu->call_site_htab, &call_site_local, INSERT);
13971 complaint (_("Duplicate PC %s for DW_TAG_call_site "
13972 "DIE %s [in module %s]"),
13973 paddress (gdbarch, pc), sect_offset_str (die->sect_off),
13974 objfile_name (objfile));
13978 /* Count parameters at the caller. */
13981 for (child_die = die->child; child_die && child_die->tag;
13982 child_die = sibling_die (child_die))
13984 if (child_die->tag != DW_TAG_call_site_parameter
13985 && child_die->tag != DW_TAG_GNU_call_site_parameter)
13987 complaint (_("Tag %d is not DW_TAG_call_site_parameter in "
13988 "DW_TAG_call_site child DIE %s [in module %s]"),
13989 child_die->tag, sect_offset_str (child_die->sect_off),
13990 objfile_name (objfile));
13998 = ((struct call_site *)
13999 obstack_alloc (&objfile->objfile_obstack,
14000 sizeof (*call_site)
14001 + (sizeof (*call_site->parameter) * (nparams - 1))));
14003 memset (call_site, 0, sizeof (*call_site) - sizeof (*call_site->parameter));
14004 call_site->pc = pc;
14006 if (dwarf2_flag_true_p (die, DW_AT_call_tail_call, cu)
14007 || dwarf2_flag_true_p (die, DW_AT_GNU_tail_call, cu))
14009 struct die_info *func_die;
14011 /* Skip also over DW_TAG_inlined_subroutine. */
14012 for (func_die = die->parent;
14013 func_die && func_die->tag != DW_TAG_subprogram
14014 && func_die->tag != DW_TAG_subroutine_type;
14015 func_die = func_die->parent);
14017 /* DW_AT_call_all_calls is a superset
14018 of DW_AT_call_all_tail_calls. */
14020 && !dwarf2_flag_true_p (func_die, DW_AT_call_all_calls, cu)
14021 && !dwarf2_flag_true_p (func_die, DW_AT_GNU_all_call_sites, cu)
14022 && !dwarf2_flag_true_p (func_die, DW_AT_call_all_tail_calls, cu)
14023 && !dwarf2_flag_true_p (func_die, DW_AT_GNU_all_tail_call_sites, cu))
14025 /* TYPE_TAIL_CALL_LIST is not interesting in functions where it is
14026 not complete. But keep CALL_SITE for look ups via call_site_htab,
14027 both the initial caller containing the real return address PC and
14028 the final callee containing the current PC of a chain of tail
14029 calls do not need to have the tail call list complete. But any
14030 function candidate for a virtual tail call frame searched via
14031 TYPE_TAIL_CALL_LIST must have the tail call list complete to be
14032 determined unambiguously. */
14036 struct type *func_type = NULL;
14039 func_type = get_die_type (func_die, cu);
14040 if (func_type != NULL)
14042 gdb_assert (TYPE_CODE (func_type) == TYPE_CODE_FUNC);
14044 /* Enlist this call site to the function. */
14045 call_site->tail_call_next = TYPE_TAIL_CALL_LIST (func_type);
14046 TYPE_TAIL_CALL_LIST (func_type) = call_site;
14049 complaint (_("Cannot find function owning DW_TAG_call_site "
14050 "DIE %s [in module %s]"),
14051 sect_offset_str (die->sect_off), objfile_name (objfile));
14055 attr = dwarf2_attr (die, DW_AT_call_target, cu);
14057 attr = dwarf2_attr (die, DW_AT_GNU_call_site_target, cu);
14059 attr = dwarf2_attr (die, DW_AT_call_origin, cu);
14062 /* This was a pre-DWARF-5 GNU extension alias for DW_AT_call_origin. */
14063 attr = dwarf2_attr (die, DW_AT_abstract_origin, cu);
14065 SET_FIELD_DWARF_BLOCK (call_site->target, NULL);
14066 if (!attr || (attr_form_is_block (attr) && DW_BLOCK (attr)->size == 0))
14067 /* Keep NULL DWARF_BLOCK. */;
14068 else if (attr_form_is_block (attr))
14070 struct dwarf2_locexpr_baton *dlbaton;
14072 dlbaton = XOBNEW (&objfile->objfile_obstack, struct dwarf2_locexpr_baton);
14073 dlbaton->data = DW_BLOCK (attr)->data;
14074 dlbaton->size = DW_BLOCK (attr)->size;
14075 dlbaton->per_cu = cu->per_cu;
14077 SET_FIELD_DWARF_BLOCK (call_site->target, dlbaton);
14079 else if (attr_form_is_ref (attr))
14081 struct dwarf2_cu *target_cu = cu;
14082 struct die_info *target_die;
14084 target_die = follow_die_ref (die, attr, &target_cu);
14085 gdb_assert (target_cu->per_cu->dwarf2_per_objfile->objfile == objfile);
14086 if (die_is_declaration (target_die, target_cu))
14088 const char *target_physname;
14090 /* Prefer the mangled name; otherwise compute the demangled one. */
14091 target_physname = dw2_linkage_name (target_die, target_cu);
14092 if (target_physname == NULL)
14093 target_physname = dwarf2_physname (NULL, target_die, target_cu);
14094 if (target_physname == NULL)
14095 complaint (_("DW_AT_call_target target DIE has invalid "
14096 "physname, for referencing DIE %s [in module %s]"),
14097 sect_offset_str (die->sect_off), objfile_name (objfile));
14099 SET_FIELD_PHYSNAME (call_site->target, target_physname);
14105 /* DW_AT_entry_pc should be preferred. */
14106 if (dwarf2_get_pc_bounds (target_die, &lowpc, NULL, target_cu, NULL)
14107 <= PC_BOUNDS_INVALID)
14108 complaint (_("DW_AT_call_target target DIE has invalid "
14109 "low pc, for referencing DIE %s [in module %s]"),
14110 sect_offset_str (die->sect_off), objfile_name (objfile));
14113 lowpc = gdbarch_adjust_dwarf2_addr (gdbarch, lowpc + baseaddr);
14114 SET_FIELD_PHYSADDR (call_site->target, lowpc);
14119 complaint (_("DW_TAG_call_site DW_AT_call_target is neither "
14120 "block nor reference, for DIE %s [in module %s]"),
14121 sect_offset_str (die->sect_off), objfile_name (objfile));
14123 call_site->per_cu = cu->per_cu;
14125 for (child_die = die->child;
14126 child_die && child_die->tag;
14127 child_die = sibling_die (child_die))
14129 struct call_site_parameter *parameter;
14130 struct attribute *loc, *origin;
14132 if (child_die->tag != DW_TAG_call_site_parameter
14133 && child_die->tag != DW_TAG_GNU_call_site_parameter)
14135 /* Already printed the complaint above. */
14139 gdb_assert (call_site->parameter_count < nparams);
14140 parameter = &call_site->parameter[call_site->parameter_count];
14142 /* DW_AT_location specifies the register number or DW_AT_abstract_origin
14143 specifies DW_TAG_formal_parameter. Value of the data assumed for the
14144 register is contained in DW_AT_call_value. */
14146 loc = dwarf2_attr (child_die, DW_AT_location, cu);
14147 origin = dwarf2_attr (child_die, DW_AT_call_parameter, cu);
14148 if (origin == NULL)
14150 /* This was a pre-DWARF-5 GNU extension alias
14151 for DW_AT_call_parameter. */
14152 origin = dwarf2_attr (child_die, DW_AT_abstract_origin, cu);
14154 if (loc == NULL && origin != NULL && attr_form_is_ref (origin))
14156 parameter->kind = CALL_SITE_PARAMETER_PARAM_OFFSET;
14158 sect_offset sect_off
14159 = (sect_offset) dwarf2_get_ref_die_offset (origin);
14160 if (!offset_in_cu_p (&cu->header, sect_off))
14162 /* As DW_OP_GNU_parameter_ref uses CU-relative offset this
14163 binding can be done only inside one CU. Such referenced DIE
14164 therefore cannot be even moved to DW_TAG_partial_unit. */
14165 complaint (_("DW_AT_call_parameter offset is not in CU for "
14166 "DW_TAG_call_site child DIE %s [in module %s]"),
14167 sect_offset_str (child_die->sect_off),
14168 objfile_name (objfile));
14171 parameter->u.param_cu_off
14172 = (cu_offset) (sect_off - cu->header.sect_off);
14174 else if (loc == NULL || origin != NULL || !attr_form_is_block (loc))
14176 complaint (_("No DW_FORM_block* DW_AT_location for "
14177 "DW_TAG_call_site child DIE %s [in module %s]"),
14178 sect_offset_str (child_die->sect_off), objfile_name (objfile));
14183 parameter->u.dwarf_reg = dwarf_block_to_dwarf_reg
14184 (DW_BLOCK (loc)->data, &DW_BLOCK (loc)->data[DW_BLOCK (loc)->size]);
14185 if (parameter->u.dwarf_reg != -1)
14186 parameter->kind = CALL_SITE_PARAMETER_DWARF_REG;
14187 else if (dwarf_block_to_sp_offset (gdbarch, DW_BLOCK (loc)->data,
14188 &DW_BLOCK (loc)->data[DW_BLOCK (loc)->size],
14189 ¶meter->u.fb_offset))
14190 parameter->kind = CALL_SITE_PARAMETER_FB_OFFSET;
14193 complaint (_("Only single DW_OP_reg or DW_OP_fbreg is supported "
14194 "for DW_FORM_block* DW_AT_location is supported for "
14195 "DW_TAG_call_site child DIE %s "
14197 sect_offset_str (child_die->sect_off),
14198 objfile_name (objfile));
14203 attr = dwarf2_attr (child_die, DW_AT_call_value, cu);
14205 attr = dwarf2_attr (child_die, DW_AT_GNU_call_site_value, cu);
14206 if (!attr_form_is_block (attr))
14208 complaint (_("No DW_FORM_block* DW_AT_call_value for "
14209 "DW_TAG_call_site child DIE %s [in module %s]"),
14210 sect_offset_str (child_die->sect_off),
14211 objfile_name (objfile));
14214 parameter->value = DW_BLOCK (attr)->data;
14215 parameter->value_size = DW_BLOCK (attr)->size;
14217 /* Parameters are not pre-cleared by memset above. */
14218 parameter->data_value = NULL;
14219 parameter->data_value_size = 0;
14220 call_site->parameter_count++;
14222 attr = dwarf2_attr (child_die, DW_AT_call_data_value, cu);
14224 attr = dwarf2_attr (child_die, DW_AT_GNU_call_site_data_value, cu);
14227 if (!attr_form_is_block (attr))
14228 complaint (_("No DW_FORM_block* DW_AT_call_data_value for "
14229 "DW_TAG_call_site child DIE %s [in module %s]"),
14230 sect_offset_str (child_die->sect_off),
14231 objfile_name (objfile));
14234 parameter->data_value = DW_BLOCK (attr)->data;
14235 parameter->data_value_size = DW_BLOCK (attr)->size;
14241 /* Helper function for read_variable. If DIE represents a virtual
14242 table, then return the type of the concrete object that is
14243 associated with the virtual table. Otherwise, return NULL. */
14245 static struct type *
14246 rust_containing_type (struct die_info *die, struct dwarf2_cu *cu)
14248 struct attribute *attr = dwarf2_attr (die, DW_AT_type, cu);
14252 /* Find the type DIE. */
14253 struct die_info *type_die = NULL;
14254 struct dwarf2_cu *type_cu = cu;
14256 if (attr_form_is_ref (attr))
14257 type_die = follow_die_ref (die, attr, &type_cu);
14258 if (type_die == NULL)
14261 if (dwarf2_attr (type_die, DW_AT_containing_type, type_cu) == NULL)
14263 return die_containing_type (type_die, type_cu);
14266 /* Read a variable (DW_TAG_variable) DIE and create a new symbol. */
14269 read_variable (struct die_info *die, struct dwarf2_cu *cu)
14271 struct rust_vtable_symbol *storage = NULL;
14273 if (cu->language == language_rust)
14275 struct type *containing_type = rust_containing_type (die, cu);
14277 if (containing_type != NULL)
14279 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
14281 storage = OBSTACK_ZALLOC (&objfile->objfile_obstack,
14282 struct rust_vtable_symbol);
14283 initialize_objfile_symbol (storage);
14284 storage->concrete_type = containing_type;
14285 storage->subclass = SYMBOL_RUST_VTABLE;
14289 struct symbol *res = new_symbol (die, NULL, cu, storage);
14290 struct attribute *abstract_origin
14291 = dwarf2_attr (die, DW_AT_abstract_origin, cu);
14292 struct attribute *loc = dwarf2_attr (die, DW_AT_location, cu);
14293 if (res == NULL && loc && abstract_origin)
14295 /* We have a variable without a name, but with a location and an abstract
14296 origin. This may be a concrete instance of an abstract variable
14297 referenced from an DW_OP_GNU_variable_value, so save it to find it back
14299 struct dwarf2_cu *origin_cu = cu;
14300 struct die_info *origin_die
14301 = follow_die_ref (die, abstract_origin, &origin_cu);
14302 dwarf2_per_objfile *dpo = cu->per_cu->dwarf2_per_objfile;
14303 dpo->abstract_to_concrete[origin_die].push_back (die);
14307 /* Call CALLBACK from DW_AT_ranges attribute value OFFSET
14308 reading .debug_rnglists.
14309 Callback's type should be:
14310 void (CORE_ADDR range_beginning, CORE_ADDR range_end)
14311 Return true if the attributes are present and valid, otherwise,
14314 template <typename Callback>
14316 dwarf2_rnglists_process (unsigned offset, struct dwarf2_cu *cu,
14317 Callback &&callback)
14319 struct dwarf2_per_objfile *dwarf2_per_objfile
14320 = cu->per_cu->dwarf2_per_objfile;
14321 struct objfile *objfile = dwarf2_per_objfile->objfile;
14322 bfd *obfd = objfile->obfd;
14323 /* Base address selection entry. */
14326 const gdb_byte *buffer;
14327 CORE_ADDR baseaddr;
14328 bool overflow = false;
14330 found_base = cu->base_known;
14331 base = cu->base_address;
14333 dwarf2_read_section (objfile, &dwarf2_per_objfile->rnglists);
14334 if (offset >= dwarf2_per_objfile->rnglists.size)
14336 complaint (_("Offset %d out of bounds for DW_AT_ranges attribute"),
14340 buffer = dwarf2_per_objfile->rnglists.buffer + offset;
14342 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
14346 /* Initialize it due to a false compiler warning. */
14347 CORE_ADDR range_beginning = 0, range_end = 0;
14348 const gdb_byte *buf_end = (dwarf2_per_objfile->rnglists.buffer
14349 + dwarf2_per_objfile->rnglists.size);
14350 unsigned int bytes_read;
14352 if (buffer == buf_end)
14357 const auto rlet = static_cast<enum dwarf_range_list_entry>(*buffer++);
14360 case DW_RLE_end_of_list:
14362 case DW_RLE_base_address:
14363 if (buffer + cu->header.addr_size > buf_end)
14368 base = read_address (obfd, buffer, cu, &bytes_read);
14370 buffer += bytes_read;
14372 case DW_RLE_start_length:
14373 if (buffer + cu->header.addr_size > buf_end)
14378 range_beginning = read_address (obfd, buffer, cu, &bytes_read);
14379 buffer += bytes_read;
14380 range_end = (range_beginning
14381 + read_unsigned_leb128 (obfd, buffer, &bytes_read));
14382 buffer += bytes_read;
14383 if (buffer > buf_end)
14389 case DW_RLE_offset_pair:
14390 range_beginning = read_unsigned_leb128 (obfd, buffer, &bytes_read);
14391 buffer += bytes_read;
14392 if (buffer > buf_end)
14397 range_end = read_unsigned_leb128 (obfd, buffer, &bytes_read);
14398 buffer += bytes_read;
14399 if (buffer > buf_end)
14405 case DW_RLE_start_end:
14406 if (buffer + 2 * cu->header.addr_size > buf_end)
14411 range_beginning = read_address (obfd, buffer, cu, &bytes_read);
14412 buffer += bytes_read;
14413 range_end = read_address (obfd, buffer, cu, &bytes_read);
14414 buffer += bytes_read;
14417 complaint (_("Invalid .debug_rnglists data (no base address)"));
14420 if (rlet == DW_RLE_end_of_list || overflow)
14422 if (rlet == DW_RLE_base_address)
14427 /* We have no valid base address for the ranges
14429 complaint (_("Invalid .debug_rnglists data (no base address)"));
14433 if (range_beginning > range_end)
14435 /* Inverted range entries are invalid. */
14436 complaint (_("Invalid .debug_rnglists data (inverted range)"));
14440 /* Empty range entries have no effect. */
14441 if (range_beginning == range_end)
14444 range_beginning += base;
14447 /* A not-uncommon case of bad debug info.
14448 Don't pollute the addrmap with bad data. */
14449 if (range_beginning + baseaddr == 0
14450 && !dwarf2_per_objfile->has_section_at_zero)
14452 complaint (_(".debug_rnglists entry has start address of zero"
14453 " [in module %s]"), objfile_name (objfile));
14457 callback (range_beginning, range_end);
14462 complaint (_("Offset %d is not terminated "
14463 "for DW_AT_ranges attribute"),
14471 /* Call CALLBACK from DW_AT_ranges attribute value OFFSET reading .debug_ranges.
14472 Callback's type should be:
14473 void (CORE_ADDR range_beginning, CORE_ADDR range_end)
14474 Return 1 if the attributes are present and valid, otherwise, return 0. */
14476 template <typename Callback>
14478 dwarf2_ranges_process (unsigned offset, struct dwarf2_cu *cu,
14479 Callback &&callback)
14481 struct dwarf2_per_objfile *dwarf2_per_objfile
14482 = cu->per_cu->dwarf2_per_objfile;
14483 struct objfile *objfile = dwarf2_per_objfile->objfile;
14484 struct comp_unit_head *cu_header = &cu->header;
14485 bfd *obfd = objfile->obfd;
14486 unsigned int addr_size = cu_header->addr_size;
14487 CORE_ADDR mask = ~(~(CORE_ADDR)1 << (addr_size * 8 - 1));
14488 /* Base address selection entry. */
14491 unsigned int dummy;
14492 const gdb_byte *buffer;
14493 CORE_ADDR baseaddr;
14495 if (cu_header->version >= 5)
14496 return dwarf2_rnglists_process (offset, cu, callback);
14498 found_base = cu->base_known;
14499 base = cu->base_address;
14501 dwarf2_read_section (objfile, &dwarf2_per_objfile->ranges);
14502 if (offset >= dwarf2_per_objfile->ranges.size)
14504 complaint (_("Offset %d out of bounds for DW_AT_ranges attribute"),
14508 buffer = dwarf2_per_objfile->ranges.buffer + offset;
14510 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
14514 CORE_ADDR range_beginning, range_end;
14516 range_beginning = read_address (obfd, buffer, cu, &dummy);
14517 buffer += addr_size;
14518 range_end = read_address (obfd, buffer, cu, &dummy);
14519 buffer += addr_size;
14520 offset += 2 * addr_size;
14522 /* An end of list marker is a pair of zero addresses. */
14523 if (range_beginning == 0 && range_end == 0)
14524 /* Found the end of list entry. */
14527 /* Each base address selection entry is a pair of 2 values.
14528 The first is the largest possible address, the second is
14529 the base address. Check for a base address here. */
14530 if ((range_beginning & mask) == mask)
14532 /* If we found the largest possible address, then we already
14533 have the base address in range_end. */
14541 /* We have no valid base address for the ranges
14543 complaint (_("Invalid .debug_ranges data (no base address)"));
14547 if (range_beginning > range_end)
14549 /* Inverted range entries are invalid. */
14550 complaint (_("Invalid .debug_ranges data (inverted range)"));
14554 /* Empty range entries have no effect. */
14555 if (range_beginning == range_end)
14558 range_beginning += base;
14561 /* A not-uncommon case of bad debug info.
14562 Don't pollute the addrmap with bad data. */
14563 if (range_beginning + baseaddr == 0
14564 && !dwarf2_per_objfile->has_section_at_zero)
14566 complaint (_(".debug_ranges entry has start address of zero"
14567 " [in module %s]"), objfile_name (objfile));
14571 callback (range_beginning, range_end);
14577 /* Get low and high pc attributes from DW_AT_ranges attribute value OFFSET.
14578 Return 1 if the attributes are present and valid, otherwise, return 0.
14579 If RANGES_PST is not NULL we should setup `objfile->psymtabs_addrmap'. */
14582 dwarf2_ranges_read (unsigned offset, CORE_ADDR *low_return,
14583 CORE_ADDR *high_return, struct dwarf2_cu *cu,
14584 struct partial_symtab *ranges_pst)
14586 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
14587 struct gdbarch *gdbarch = get_objfile_arch (objfile);
14588 const CORE_ADDR baseaddr = ANOFFSET (objfile->section_offsets,
14589 SECT_OFF_TEXT (objfile));
14592 CORE_ADDR high = 0;
14595 retval = dwarf2_ranges_process (offset, cu,
14596 [&] (CORE_ADDR range_beginning, CORE_ADDR range_end)
14598 if (ranges_pst != NULL)
14603 lowpc = (gdbarch_adjust_dwarf2_addr (gdbarch,
14604 range_beginning + baseaddr)
14606 highpc = (gdbarch_adjust_dwarf2_addr (gdbarch,
14607 range_end + baseaddr)
14609 addrmap_set_empty (objfile->partial_symtabs->psymtabs_addrmap,
14610 lowpc, highpc - 1, ranges_pst);
14613 /* FIXME: This is recording everything as a low-high
14614 segment of consecutive addresses. We should have a
14615 data structure for discontiguous block ranges
14619 low = range_beginning;
14625 if (range_beginning < low)
14626 low = range_beginning;
14627 if (range_end > high)
14635 /* If the first entry is an end-of-list marker, the range
14636 describes an empty scope, i.e. no instructions. */
14642 *high_return = high;
14646 /* Get low and high pc attributes from a die. See enum pc_bounds_kind
14647 definition for the return value. *LOWPC and *HIGHPC are set iff
14648 neither PC_BOUNDS_NOT_PRESENT nor PC_BOUNDS_INVALID are returned. */
14650 static enum pc_bounds_kind
14651 dwarf2_get_pc_bounds (struct die_info *die, CORE_ADDR *lowpc,
14652 CORE_ADDR *highpc, struct dwarf2_cu *cu,
14653 struct partial_symtab *pst)
14655 struct dwarf2_per_objfile *dwarf2_per_objfile
14656 = cu->per_cu->dwarf2_per_objfile;
14657 struct attribute *attr;
14658 struct attribute *attr_high;
14660 CORE_ADDR high = 0;
14661 enum pc_bounds_kind ret;
14663 attr_high = dwarf2_attr (die, DW_AT_high_pc, cu);
14666 attr = dwarf2_attr (die, DW_AT_low_pc, cu);
14669 low = attr_value_as_address (attr);
14670 high = attr_value_as_address (attr_high);
14671 if (cu->header.version >= 4 && attr_form_is_constant (attr_high))
14675 /* Found high w/o low attribute. */
14676 return PC_BOUNDS_INVALID;
14678 /* Found consecutive range of addresses. */
14679 ret = PC_BOUNDS_HIGH_LOW;
14683 attr = dwarf2_attr (die, DW_AT_ranges, cu);
14686 /* DW_AT_ranges_base does not apply to DIEs from the DWO skeleton.
14687 We take advantage of the fact that DW_AT_ranges does not appear
14688 in DW_TAG_compile_unit of DWO files. */
14689 int need_ranges_base = die->tag != DW_TAG_compile_unit;
14690 unsigned int ranges_offset = (DW_UNSND (attr)
14691 + (need_ranges_base
14695 /* Value of the DW_AT_ranges attribute is the offset in the
14696 .debug_ranges section. */
14697 if (!dwarf2_ranges_read (ranges_offset, &low, &high, cu, pst))
14698 return PC_BOUNDS_INVALID;
14699 /* Found discontinuous range of addresses. */
14700 ret = PC_BOUNDS_RANGES;
14703 return PC_BOUNDS_NOT_PRESENT;
14706 /* partial_die_info::read has also the strict LOW < HIGH requirement. */
14708 return PC_BOUNDS_INVALID;
14710 /* When using the GNU linker, .gnu.linkonce. sections are used to
14711 eliminate duplicate copies of functions and vtables and such.
14712 The linker will arbitrarily choose one and discard the others.
14713 The AT_*_pc values for such functions refer to local labels in
14714 these sections. If the section from that file was discarded, the
14715 labels are not in the output, so the relocs get a value of 0.
14716 If this is a discarded function, mark the pc bounds as invalid,
14717 so that GDB will ignore it. */
14718 if (low == 0 && !dwarf2_per_objfile->has_section_at_zero)
14719 return PC_BOUNDS_INVALID;
14727 /* Assuming that DIE represents a subprogram DIE or a lexical block, get
14728 its low and high PC addresses. Do nothing if these addresses could not
14729 be determined. Otherwise, set LOWPC to the low address if it is smaller,
14730 and HIGHPC to the high address if greater than HIGHPC. */
14733 dwarf2_get_subprogram_pc_bounds (struct die_info *die,
14734 CORE_ADDR *lowpc, CORE_ADDR *highpc,
14735 struct dwarf2_cu *cu)
14737 CORE_ADDR low, high;
14738 struct die_info *child = die->child;
14740 if (dwarf2_get_pc_bounds (die, &low, &high, cu, NULL) >= PC_BOUNDS_RANGES)
14742 *lowpc = std::min (*lowpc, low);
14743 *highpc = std::max (*highpc, high);
14746 /* If the language does not allow nested subprograms (either inside
14747 subprograms or lexical blocks), we're done. */
14748 if (cu->language != language_ada)
14751 /* Check all the children of the given DIE. If it contains nested
14752 subprograms, then check their pc bounds. Likewise, we need to
14753 check lexical blocks as well, as they may also contain subprogram
14755 while (child && child->tag)
14757 if (child->tag == DW_TAG_subprogram
14758 || child->tag == DW_TAG_lexical_block)
14759 dwarf2_get_subprogram_pc_bounds (child, lowpc, highpc, cu);
14760 child = sibling_die (child);
14764 /* Get the low and high pc's represented by the scope DIE, and store
14765 them in *LOWPC and *HIGHPC. If the correct values can't be
14766 determined, set *LOWPC to -1 and *HIGHPC to 0. */
14769 get_scope_pc_bounds (struct die_info *die,
14770 CORE_ADDR *lowpc, CORE_ADDR *highpc,
14771 struct dwarf2_cu *cu)
14773 CORE_ADDR best_low = (CORE_ADDR) -1;
14774 CORE_ADDR best_high = (CORE_ADDR) 0;
14775 CORE_ADDR current_low, current_high;
14777 if (dwarf2_get_pc_bounds (die, ¤t_low, ¤t_high, cu, NULL)
14778 >= PC_BOUNDS_RANGES)
14780 best_low = current_low;
14781 best_high = current_high;
14785 struct die_info *child = die->child;
14787 while (child && child->tag)
14789 switch (child->tag) {
14790 case DW_TAG_subprogram:
14791 dwarf2_get_subprogram_pc_bounds (child, &best_low, &best_high, cu);
14793 case DW_TAG_namespace:
14794 case DW_TAG_module:
14795 /* FIXME: carlton/2004-01-16: Should we do this for
14796 DW_TAG_class_type/DW_TAG_structure_type, too? I think
14797 that current GCC's always emit the DIEs corresponding
14798 to definitions of methods of classes as children of a
14799 DW_TAG_compile_unit or DW_TAG_namespace (as opposed to
14800 the DIEs giving the declarations, which could be
14801 anywhere). But I don't see any reason why the
14802 standards says that they have to be there. */
14803 get_scope_pc_bounds (child, ¤t_low, ¤t_high, cu);
14805 if (current_low != ((CORE_ADDR) -1))
14807 best_low = std::min (best_low, current_low);
14808 best_high = std::max (best_high, current_high);
14816 child = sibling_die (child);
14821 *highpc = best_high;
14824 /* Record the address ranges for BLOCK, offset by BASEADDR, as given
14828 dwarf2_record_block_ranges (struct die_info *die, struct block *block,
14829 CORE_ADDR baseaddr, struct dwarf2_cu *cu)
14831 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
14832 struct gdbarch *gdbarch = get_objfile_arch (objfile);
14833 struct attribute *attr;
14834 struct attribute *attr_high;
14836 attr_high = dwarf2_attr (die, DW_AT_high_pc, cu);
14839 attr = dwarf2_attr (die, DW_AT_low_pc, cu);
14842 CORE_ADDR low = attr_value_as_address (attr);
14843 CORE_ADDR high = attr_value_as_address (attr_high);
14845 if (cu->header.version >= 4 && attr_form_is_constant (attr_high))
14848 low = gdbarch_adjust_dwarf2_addr (gdbarch, low + baseaddr);
14849 high = gdbarch_adjust_dwarf2_addr (gdbarch, high + baseaddr);
14850 cu->get_builder ()->record_block_range (block, low, high - 1);
14854 attr = dwarf2_attr (die, DW_AT_ranges, cu);
14857 /* DW_AT_ranges_base does not apply to DIEs from the DWO skeleton.
14858 We take advantage of the fact that DW_AT_ranges does not appear
14859 in DW_TAG_compile_unit of DWO files. */
14860 int need_ranges_base = die->tag != DW_TAG_compile_unit;
14862 /* The value of the DW_AT_ranges attribute is the offset of the
14863 address range list in the .debug_ranges section. */
14864 unsigned long offset = (DW_UNSND (attr)
14865 + (need_ranges_base ? cu->ranges_base : 0));
14867 std::vector<blockrange> blockvec;
14868 dwarf2_ranges_process (offset, cu,
14869 [&] (CORE_ADDR start, CORE_ADDR end)
14873 start = gdbarch_adjust_dwarf2_addr (gdbarch, start);
14874 end = gdbarch_adjust_dwarf2_addr (gdbarch, end);
14875 cu->get_builder ()->record_block_range (block, start, end - 1);
14876 blockvec.emplace_back (start, end);
14879 BLOCK_RANGES(block) = make_blockranges (objfile, blockvec);
14883 /* Check whether the producer field indicates either of GCC < 4.6, or the
14884 Intel C/C++ compiler, and cache the result in CU. */
14887 check_producer (struct dwarf2_cu *cu)
14891 if (cu->producer == NULL)
14893 /* For unknown compilers expect their behavior is DWARF version
14896 GCC started to support .debug_types sections by -gdwarf-4 since
14897 gcc-4.5.x. As the .debug_types sections are missing DW_AT_producer
14898 for their space efficiency GDB cannot workaround gcc-4.5.x -gdwarf-4
14899 combination. gcc-4.5.x -gdwarf-4 binaries have DW_AT_accessibility
14900 interpreted incorrectly by GDB now - GCC PR debug/48229. */
14902 else if (producer_is_gcc (cu->producer, &major, &minor))
14904 cu->producer_is_gxx_lt_4_6 = major < 4 || (major == 4 && minor < 6);
14905 cu->producer_is_gcc_lt_4_3 = major < 4 || (major == 4 && minor < 3);
14907 else if (producer_is_icc (cu->producer, &major, &minor))
14909 cu->producer_is_icc = true;
14910 cu->producer_is_icc_lt_14 = major < 14;
14912 else if (startswith (cu->producer, "CodeWarrior S12/L-ISA"))
14913 cu->producer_is_codewarrior = true;
14916 /* For other non-GCC compilers, expect their behavior is DWARF version
14920 cu->checked_producer = true;
14923 /* Check for GCC PR debug/45124 fix which is not present in any G++ version up
14924 to 4.5.any while it is present already in G++ 4.6.0 - the PR has been fixed
14925 during 4.6.0 experimental. */
14928 producer_is_gxx_lt_4_6 (struct dwarf2_cu *cu)
14930 if (!cu->checked_producer)
14931 check_producer (cu);
14933 return cu->producer_is_gxx_lt_4_6;
14937 /* Codewarrior (at least as of version 5.0.40) generates dwarf line information
14938 with incorrect is_stmt attributes. */
14941 producer_is_codewarrior (struct dwarf2_cu *cu)
14943 if (!cu->checked_producer)
14944 check_producer (cu);
14946 return cu->producer_is_codewarrior;
14949 /* Return the default accessibility type if it is not overriden by
14950 DW_AT_accessibility. */
14952 static enum dwarf_access_attribute
14953 dwarf2_default_access_attribute (struct die_info *die, struct dwarf2_cu *cu)
14955 if (cu->header.version < 3 || producer_is_gxx_lt_4_6 (cu))
14957 /* The default DWARF 2 accessibility for members is public, the default
14958 accessibility for inheritance is private. */
14960 if (die->tag != DW_TAG_inheritance)
14961 return DW_ACCESS_public;
14963 return DW_ACCESS_private;
14967 /* DWARF 3+ defines the default accessibility a different way. The same
14968 rules apply now for DW_TAG_inheritance as for the members and it only
14969 depends on the container kind. */
14971 if (die->parent->tag == DW_TAG_class_type)
14972 return DW_ACCESS_private;
14974 return DW_ACCESS_public;
14978 /* Look for DW_AT_data_member_location. Set *OFFSET to the byte
14979 offset. If the attribute was not found return 0, otherwise return
14980 1. If it was found but could not properly be handled, set *OFFSET
14984 handle_data_member_location (struct die_info *die, struct dwarf2_cu *cu,
14987 struct attribute *attr;
14989 attr = dwarf2_attr (die, DW_AT_data_member_location, cu);
14994 /* Note that we do not check for a section offset first here.
14995 This is because DW_AT_data_member_location is new in DWARF 4,
14996 so if we see it, we can assume that a constant form is really
14997 a constant and not a section offset. */
14998 if (attr_form_is_constant (attr))
14999 *offset = dwarf2_get_attr_constant_value (attr, 0);
15000 else if (attr_form_is_section_offset (attr))
15001 dwarf2_complex_location_expr_complaint ();
15002 else if (attr_form_is_block (attr))
15003 *offset = decode_locdesc (DW_BLOCK (attr), cu);
15005 dwarf2_complex_location_expr_complaint ();
15013 /* Add an aggregate field to the field list. */
15016 dwarf2_add_field (struct field_info *fip, struct die_info *die,
15017 struct dwarf2_cu *cu)
15019 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
15020 struct gdbarch *gdbarch = get_objfile_arch (objfile);
15021 struct nextfield *new_field;
15022 struct attribute *attr;
15024 const char *fieldname = "";
15026 if (die->tag == DW_TAG_inheritance)
15028 fip->baseclasses.emplace_back ();
15029 new_field = &fip->baseclasses.back ();
15033 fip->fields.emplace_back ();
15034 new_field = &fip->fields.back ();
15039 attr = dwarf2_attr (die, DW_AT_accessibility, cu);
15041 new_field->accessibility = DW_UNSND (attr);
15043 new_field->accessibility = dwarf2_default_access_attribute (die, cu);
15044 if (new_field->accessibility != DW_ACCESS_public)
15045 fip->non_public_fields = 1;
15047 attr = dwarf2_attr (die, DW_AT_virtuality, cu);
15049 new_field->virtuality = DW_UNSND (attr);
15051 new_field->virtuality = DW_VIRTUALITY_none;
15053 fp = &new_field->field;
15055 if (die->tag == DW_TAG_member && ! die_is_declaration (die, cu))
15059 /* Data member other than a C++ static data member. */
15061 /* Get type of field. */
15062 fp->type = die_type (die, cu);
15064 SET_FIELD_BITPOS (*fp, 0);
15066 /* Get bit size of field (zero if none). */
15067 attr = dwarf2_attr (die, DW_AT_bit_size, cu);
15070 FIELD_BITSIZE (*fp) = DW_UNSND (attr);
15074 FIELD_BITSIZE (*fp) = 0;
15077 /* Get bit offset of field. */
15078 if (handle_data_member_location (die, cu, &offset))
15079 SET_FIELD_BITPOS (*fp, offset * bits_per_byte);
15080 attr = dwarf2_attr (die, DW_AT_bit_offset, cu);
15083 if (gdbarch_bits_big_endian (gdbarch))
15085 /* For big endian bits, the DW_AT_bit_offset gives the
15086 additional bit offset from the MSB of the containing
15087 anonymous object to the MSB of the field. We don't
15088 have to do anything special since we don't need to
15089 know the size of the anonymous object. */
15090 SET_FIELD_BITPOS (*fp, FIELD_BITPOS (*fp) + DW_UNSND (attr));
15094 /* For little endian bits, compute the bit offset to the
15095 MSB of the anonymous object, subtract off the number of
15096 bits from the MSB of the field to the MSB of the
15097 object, and then subtract off the number of bits of
15098 the field itself. The result is the bit offset of
15099 the LSB of the field. */
15100 int anonymous_size;
15101 int bit_offset = DW_UNSND (attr);
15103 attr = dwarf2_attr (die, DW_AT_byte_size, cu);
15106 /* The size of the anonymous object containing
15107 the bit field is explicit, so use the
15108 indicated size (in bytes). */
15109 anonymous_size = DW_UNSND (attr);
15113 /* The size of the anonymous object containing
15114 the bit field must be inferred from the type
15115 attribute of the data member containing the
15117 anonymous_size = TYPE_LENGTH (fp->type);
15119 SET_FIELD_BITPOS (*fp,
15120 (FIELD_BITPOS (*fp)
15121 + anonymous_size * bits_per_byte
15122 - bit_offset - FIELD_BITSIZE (*fp)));
15125 attr = dwarf2_attr (die, DW_AT_data_bit_offset, cu);
15127 SET_FIELD_BITPOS (*fp, (FIELD_BITPOS (*fp)
15128 + dwarf2_get_attr_constant_value (attr, 0)));
15130 /* Get name of field. */
15131 fieldname = dwarf2_name (die, cu);
15132 if (fieldname == NULL)
15135 /* The name is already allocated along with this objfile, so we don't
15136 need to duplicate it for the type. */
15137 fp->name = fieldname;
15139 /* Change accessibility for artificial fields (e.g. virtual table
15140 pointer or virtual base class pointer) to private. */
15141 if (dwarf2_attr (die, DW_AT_artificial, cu))
15143 FIELD_ARTIFICIAL (*fp) = 1;
15144 new_field->accessibility = DW_ACCESS_private;
15145 fip->non_public_fields = 1;
15148 else if (die->tag == DW_TAG_member || die->tag == DW_TAG_variable)
15150 /* C++ static member. */
15152 /* NOTE: carlton/2002-11-05: It should be a DW_TAG_member that
15153 is a declaration, but all versions of G++ as of this writing
15154 (so through at least 3.2.1) incorrectly generate
15155 DW_TAG_variable tags. */
15157 const char *physname;
15159 /* Get name of field. */
15160 fieldname = dwarf2_name (die, cu);
15161 if (fieldname == NULL)
15164 attr = dwarf2_attr (die, DW_AT_const_value, cu);
15166 /* Only create a symbol if this is an external value.
15167 new_symbol checks this and puts the value in the global symbol
15168 table, which we want. If it is not external, new_symbol
15169 will try to put the value in cu->list_in_scope which is wrong. */
15170 && dwarf2_flag_true_p (die, DW_AT_external, cu))
15172 /* A static const member, not much different than an enum as far as
15173 we're concerned, except that we can support more types. */
15174 new_symbol (die, NULL, cu);
15177 /* Get physical name. */
15178 physname = dwarf2_physname (fieldname, die, cu);
15180 /* The name is already allocated along with this objfile, so we don't
15181 need to duplicate it for the type. */
15182 SET_FIELD_PHYSNAME (*fp, physname ? physname : "");
15183 FIELD_TYPE (*fp) = die_type (die, cu);
15184 FIELD_NAME (*fp) = fieldname;
15186 else if (die->tag == DW_TAG_inheritance)
15190 /* C++ base class field. */
15191 if (handle_data_member_location (die, cu, &offset))
15192 SET_FIELD_BITPOS (*fp, offset * bits_per_byte);
15193 FIELD_BITSIZE (*fp) = 0;
15194 FIELD_TYPE (*fp) = die_type (die, cu);
15195 FIELD_NAME (*fp) = TYPE_NAME (fp->type);
15197 else if (die->tag == DW_TAG_variant_part)
15199 /* process_structure_scope will treat this DIE as a union. */
15200 process_structure_scope (die, cu);
15202 /* The variant part is relative to the start of the enclosing
15204 SET_FIELD_BITPOS (*fp, 0);
15205 fp->type = get_die_type (die, cu);
15206 fp->artificial = 1;
15207 fp->name = "<<variant>>";
15209 /* Normally a DW_TAG_variant_part won't have a size, but our
15210 representation requires one, so set it to the maximum of the
15212 if (TYPE_LENGTH (fp->type) == 0)
15215 for (int i = 0; i < TYPE_NFIELDS (fp->type); ++i)
15216 if (TYPE_LENGTH (TYPE_FIELD_TYPE (fp->type, i)) > max)
15217 max = TYPE_LENGTH (TYPE_FIELD_TYPE (fp->type, i));
15218 TYPE_LENGTH (fp->type) = max;
15222 gdb_assert_not_reached ("missing case in dwarf2_add_field");
15225 /* Can the type given by DIE define another type? */
15228 type_can_define_types (const struct die_info *die)
15232 case DW_TAG_typedef:
15233 case DW_TAG_class_type:
15234 case DW_TAG_structure_type:
15235 case DW_TAG_union_type:
15236 case DW_TAG_enumeration_type:
15244 /* Add a type definition defined in the scope of the FIP's class. */
15247 dwarf2_add_type_defn (struct field_info *fip, struct die_info *die,
15248 struct dwarf2_cu *cu)
15250 struct decl_field fp;
15251 memset (&fp, 0, sizeof (fp));
15253 gdb_assert (type_can_define_types (die));
15255 /* Get name of field. NULL is okay here, meaning an anonymous type. */
15256 fp.name = dwarf2_name (die, cu);
15257 fp.type = read_type_die (die, cu);
15259 /* Save accessibility. */
15260 enum dwarf_access_attribute accessibility;
15261 struct attribute *attr = dwarf2_attr (die, DW_AT_accessibility, cu);
15263 accessibility = (enum dwarf_access_attribute) DW_UNSND (attr);
15265 accessibility = dwarf2_default_access_attribute (die, cu);
15266 switch (accessibility)
15268 case DW_ACCESS_public:
15269 /* The assumed value if neither private nor protected. */
15271 case DW_ACCESS_private:
15274 case DW_ACCESS_protected:
15275 fp.is_protected = 1;
15278 complaint (_("Unhandled DW_AT_accessibility value (%x)"), accessibility);
15281 if (die->tag == DW_TAG_typedef)
15282 fip->typedef_field_list.push_back (fp);
15284 fip->nested_types_list.push_back (fp);
15287 /* Create the vector of fields, and attach it to the type. */
15290 dwarf2_attach_fields_to_type (struct field_info *fip, struct type *type,
15291 struct dwarf2_cu *cu)
15293 int nfields = fip->nfields;
15295 /* Record the field count, allocate space for the array of fields,
15296 and create blank accessibility bitfields if necessary. */
15297 TYPE_NFIELDS (type) = nfields;
15298 TYPE_FIELDS (type) = (struct field *)
15299 TYPE_ZALLOC (type, sizeof (struct field) * nfields);
15301 if (fip->non_public_fields && cu->language != language_ada)
15303 ALLOCATE_CPLUS_STRUCT_TYPE (type);
15305 TYPE_FIELD_PRIVATE_BITS (type) =
15306 (B_TYPE *) TYPE_ALLOC (type, B_BYTES (nfields));
15307 B_CLRALL (TYPE_FIELD_PRIVATE_BITS (type), nfields);
15309 TYPE_FIELD_PROTECTED_BITS (type) =
15310 (B_TYPE *) TYPE_ALLOC (type, B_BYTES (nfields));
15311 B_CLRALL (TYPE_FIELD_PROTECTED_BITS (type), nfields);
15313 TYPE_FIELD_IGNORE_BITS (type) =
15314 (B_TYPE *) TYPE_ALLOC (type, B_BYTES (nfields));
15315 B_CLRALL (TYPE_FIELD_IGNORE_BITS (type), nfields);
15318 /* If the type has baseclasses, allocate and clear a bit vector for
15319 TYPE_FIELD_VIRTUAL_BITS. */
15320 if (!fip->baseclasses.empty () && cu->language != language_ada)
15322 int num_bytes = B_BYTES (fip->baseclasses.size ());
15323 unsigned char *pointer;
15325 ALLOCATE_CPLUS_STRUCT_TYPE (type);
15326 pointer = (unsigned char *) TYPE_ALLOC (type, num_bytes);
15327 TYPE_FIELD_VIRTUAL_BITS (type) = pointer;
15328 B_CLRALL (TYPE_FIELD_VIRTUAL_BITS (type), fip->baseclasses.size ());
15329 TYPE_N_BASECLASSES (type) = fip->baseclasses.size ();
15332 if (TYPE_FLAG_DISCRIMINATED_UNION (type))
15334 struct discriminant_info *di = alloc_discriminant_info (type, -1, -1);
15336 for (int index = 0; index < nfields; ++index)
15338 struct nextfield &field = fip->fields[index];
15340 if (field.variant.is_discriminant)
15341 di->discriminant_index = index;
15342 else if (field.variant.default_branch)
15343 di->default_index = index;
15345 di->discriminants[index] = field.variant.discriminant_value;
15349 /* Copy the saved-up fields into the field vector. */
15350 for (int i = 0; i < nfields; ++i)
15352 struct nextfield &field
15353 = ((i < fip->baseclasses.size ()) ? fip->baseclasses[i]
15354 : fip->fields[i - fip->baseclasses.size ()]);
15356 TYPE_FIELD (type, i) = field.field;
15357 switch (field.accessibility)
15359 case DW_ACCESS_private:
15360 if (cu->language != language_ada)
15361 SET_TYPE_FIELD_PRIVATE (type, i);
15364 case DW_ACCESS_protected:
15365 if (cu->language != language_ada)
15366 SET_TYPE_FIELD_PROTECTED (type, i);
15369 case DW_ACCESS_public:
15373 /* Unknown accessibility. Complain and treat it as public. */
15375 complaint (_("unsupported accessibility %d"),
15376 field.accessibility);
15380 if (i < fip->baseclasses.size ())
15382 switch (field.virtuality)
15384 case DW_VIRTUALITY_virtual:
15385 case DW_VIRTUALITY_pure_virtual:
15386 if (cu->language == language_ada)
15387 error (_("unexpected virtuality in component of Ada type"));
15388 SET_TYPE_FIELD_VIRTUAL (type, i);
15395 /* Return true if this member function is a constructor, false
15399 dwarf2_is_constructor (struct die_info *die, struct dwarf2_cu *cu)
15401 const char *fieldname;
15402 const char *type_name;
15405 if (die->parent == NULL)
15408 if (die->parent->tag != DW_TAG_structure_type
15409 && die->parent->tag != DW_TAG_union_type
15410 && die->parent->tag != DW_TAG_class_type)
15413 fieldname = dwarf2_name (die, cu);
15414 type_name = dwarf2_name (die->parent, cu);
15415 if (fieldname == NULL || type_name == NULL)
15418 len = strlen (fieldname);
15419 return (strncmp (fieldname, type_name, len) == 0
15420 && (type_name[len] == '\0' || type_name[len] == '<'));
15423 /* Add a member function to the proper fieldlist. */
15426 dwarf2_add_member_fn (struct field_info *fip, struct die_info *die,
15427 struct type *type, struct dwarf2_cu *cu)
15429 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
15430 struct attribute *attr;
15432 struct fnfieldlist *flp = nullptr;
15433 struct fn_field *fnp;
15434 const char *fieldname;
15435 struct type *this_type;
15436 enum dwarf_access_attribute accessibility;
15438 if (cu->language == language_ada)
15439 error (_("unexpected member function in Ada type"));
15441 /* Get name of member function. */
15442 fieldname = dwarf2_name (die, cu);
15443 if (fieldname == NULL)
15446 /* Look up member function name in fieldlist. */
15447 for (i = 0; i < fip->fnfieldlists.size (); i++)
15449 if (strcmp (fip->fnfieldlists[i].name, fieldname) == 0)
15451 flp = &fip->fnfieldlists[i];
15456 /* Create a new fnfieldlist if necessary. */
15457 if (flp == nullptr)
15459 fip->fnfieldlists.emplace_back ();
15460 flp = &fip->fnfieldlists.back ();
15461 flp->name = fieldname;
15462 i = fip->fnfieldlists.size () - 1;
15465 /* Create a new member function field and add it to the vector of
15467 flp->fnfields.emplace_back ();
15468 fnp = &flp->fnfields.back ();
15470 /* Delay processing of the physname until later. */
15471 if (cu->language == language_cplus)
15472 add_to_method_list (type, i, flp->fnfields.size () - 1, fieldname,
15476 const char *physname = dwarf2_physname (fieldname, die, cu);
15477 fnp->physname = physname ? physname : "";
15480 fnp->type = alloc_type (objfile);
15481 this_type = read_type_die (die, cu);
15482 if (this_type && TYPE_CODE (this_type) == TYPE_CODE_FUNC)
15484 int nparams = TYPE_NFIELDS (this_type);
15486 /* TYPE is the domain of this method, and THIS_TYPE is the type
15487 of the method itself (TYPE_CODE_METHOD). */
15488 smash_to_method_type (fnp->type, type,
15489 TYPE_TARGET_TYPE (this_type),
15490 TYPE_FIELDS (this_type),
15491 TYPE_NFIELDS (this_type),
15492 TYPE_VARARGS (this_type));
15494 /* Handle static member functions.
15495 Dwarf2 has no clean way to discern C++ static and non-static
15496 member functions. G++ helps GDB by marking the first
15497 parameter for non-static member functions (which is the this
15498 pointer) as artificial. We obtain this information from
15499 read_subroutine_type via TYPE_FIELD_ARTIFICIAL. */
15500 if (nparams == 0 || TYPE_FIELD_ARTIFICIAL (this_type, 0) == 0)
15501 fnp->voffset = VOFFSET_STATIC;
15504 complaint (_("member function type missing for '%s'"),
15505 dwarf2_full_name (fieldname, die, cu));
15507 /* Get fcontext from DW_AT_containing_type if present. */
15508 if (dwarf2_attr (die, DW_AT_containing_type, cu) != NULL)
15509 fnp->fcontext = die_containing_type (die, cu);
15511 /* dwarf2 doesn't have stubbed physical names, so the setting of is_const and
15512 is_volatile is irrelevant, as it is needed by gdb_mangle_name only. */
15514 /* Get accessibility. */
15515 attr = dwarf2_attr (die, DW_AT_accessibility, cu);
15517 accessibility = (enum dwarf_access_attribute) DW_UNSND (attr);
15519 accessibility = dwarf2_default_access_attribute (die, cu);
15520 switch (accessibility)
15522 case DW_ACCESS_private:
15523 fnp->is_private = 1;
15525 case DW_ACCESS_protected:
15526 fnp->is_protected = 1;
15530 /* Check for artificial methods. */
15531 attr = dwarf2_attr (die, DW_AT_artificial, cu);
15532 if (attr && DW_UNSND (attr) != 0)
15533 fnp->is_artificial = 1;
15535 fnp->is_constructor = dwarf2_is_constructor (die, cu);
15537 /* Get index in virtual function table if it is a virtual member
15538 function. For older versions of GCC, this is an offset in the
15539 appropriate virtual table, as specified by DW_AT_containing_type.
15540 For everyone else, it is an expression to be evaluated relative
15541 to the object address. */
15543 attr = dwarf2_attr (die, DW_AT_vtable_elem_location, cu);
15546 if (attr_form_is_block (attr) && DW_BLOCK (attr)->size > 0)
15548 if (DW_BLOCK (attr)->data[0] == DW_OP_constu)
15550 /* Old-style GCC. */
15551 fnp->voffset = decode_locdesc (DW_BLOCK (attr), cu) + 2;
15553 else if (DW_BLOCK (attr)->data[0] == DW_OP_deref
15554 || (DW_BLOCK (attr)->size > 1
15555 && DW_BLOCK (attr)->data[0] == DW_OP_deref_size
15556 && DW_BLOCK (attr)->data[1] == cu->header.addr_size))
15558 fnp->voffset = decode_locdesc (DW_BLOCK (attr), cu);
15559 if ((fnp->voffset % cu->header.addr_size) != 0)
15560 dwarf2_complex_location_expr_complaint ();
15562 fnp->voffset /= cu->header.addr_size;
15566 dwarf2_complex_location_expr_complaint ();
15568 if (!fnp->fcontext)
15570 /* If there is no `this' field and no DW_AT_containing_type,
15571 we cannot actually find a base class context for the
15573 if (TYPE_NFIELDS (this_type) == 0
15574 || !TYPE_FIELD_ARTIFICIAL (this_type, 0))
15576 complaint (_("cannot determine context for virtual member "
15577 "function \"%s\" (offset %s)"),
15578 fieldname, sect_offset_str (die->sect_off));
15583 = TYPE_TARGET_TYPE (TYPE_FIELD_TYPE (this_type, 0));
15587 else if (attr_form_is_section_offset (attr))
15589 dwarf2_complex_location_expr_complaint ();
15593 dwarf2_invalid_attrib_class_complaint ("DW_AT_vtable_elem_location",
15599 attr = dwarf2_attr (die, DW_AT_virtuality, cu);
15600 if (attr && DW_UNSND (attr))
15602 /* GCC does this, as of 2008-08-25; PR debug/37237. */
15603 complaint (_("Member function \"%s\" (offset %s) is virtual "
15604 "but the vtable offset is not specified"),
15605 fieldname, sect_offset_str (die->sect_off));
15606 ALLOCATE_CPLUS_STRUCT_TYPE (type);
15607 TYPE_CPLUS_DYNAMIC (type) = 1;
15612 /* Create the vector of member function fields, and attach it to the type. */
15615 dwarf2_attach_fn_fields_to_type (struct field_info *fip, struct type *type,
15616 struct dwarf2_cu *cu)
15618 if (cu->language == language_ada)
15619 error (_("unexpected member functions in Ada type"));
15621 ALLOCATE_CPLUS_STRUCT_TYPE (type);
15622 TYPE_FN_FIELDLISTS (type) = (struct fn_fieldlist *)
15624 sizeof (struct fn_fieldlist) * fip->fnfieldlists.size ());
15626 for (int i = 0; i < fip->fnfieldlists.size (); i++)
15628 struct fnfieldlist &nf = fip->fnfieldlists[i];
15629 struct fn_fieldlist *fn_flp = &TYPE_FN_FIELDLIST (type, i);
15631 TYPE_FN_FIELDLIST_NAME (type, i) = nf.name;
15632 TYPE_FN_FIELDLIST_LENGTH (type, i) = nf.fnfields.size ();
15633 fn_flp->fn_fields = (struct fn_field *)
15634 TYPE_ALLOC (type, sizeof (struct fn_field) * nf.fnfields.size ());
15636 for (int k = 0; k < nf.fnfields.size (); ++k)
15637 fn_flp->fn_fields[k] = nf.fnfields[k];
15640 TYPE_NFN_FIELDS (type) = fip->fnfieldlists.size ();
15643 /* Returns non-zero if NAME is the name of a vtable member in CU's
15644 language, zero otherwise. */
15646 is_vtable_name (const char *name, struct dwarf2_cu *cu)
15648 static const char vptr[] = "_vptr";
15650 /* Look for the C++ form of the vtable. */
15651 if (startswith (name, vptr) && is_cplus_marker (name[sizeof (vptr) - 1]))
15657 /* GCC outputs unnamed structures that are really pointers to member
15658 functions, with the ABI-specified layout. If TYPE describes
15659 such a structure, smash it into a member function type.
15661 GCC shouldn't do this; it should just output pointer to member DIEs.
15662 This is GCC PR debug/28767. */
15665 quirk_gcc_member_function_pointer (struct type *type, struct objfile *objfile)
15667 struct type *pfn_type, *self_type, *new_type;
15669 /* Check for a structure with no name and two children. */
15670 if (TYPE_CODE (type) != TYPE_CODE_STRUCT || TYPE_NFIELDS (type) != 2)
15673 /* Check for __pfn and __delta members. */
15674 if (TYPE_FIELD_NAME (type, 0) == NULL
15675 || strcmp (TYPE_FIELD_NAME (type, 0), "__pfn") != 0
15676 || TYPE_FIELD_NAME (type, 1) == NULL
15677 || strcmp (TYPE_FIELD_NAME (type, 1), "__delta") != 0)
15680 /* Find the type of the method. */
15681 pfn_type = TYPE_FIELD_TYPE (type, 0);
15682 if (pfn_type == NULL
15683 || TYPE_CODE (pfn_type) != TYPE_CODE_PTR
15684 || TYPE_CODE (TYPE_TARGET_TYPE (pfn_type)) != TYPE_CODE_FUNC)
15687 /* Look for the "this" argument. */
15688 pfn_type = TYPE_TARGET_TYPE (pfn_type);
15689 if (TYPE_NFIELDS (pfn_type) == 0
15690 /* || TYPE_FIELD_TYPE (pfn_type, 0) == NULL */
15691 || TYPE_CODE (TYPE_FIELD_TYPE (pfn_type, 0)) != TYPE_CODE_PTR)
15694 self_type = TYPE_TARGET_TYPE (TYPE_FIELD_TYPE (pfn_type, 0));
15695 new_type = alloc_type (objfile);
15696 smash_to_method_type (new_type, self_type, TYPE_TARGET_TYPE (pfn_type),
15697 TYPE_FIELDS (pfn_type), TYPE_NFIELDS (pfn_type),
15698 TYPE_VARARGS (pfn_type));
15699 smash_to_methodptr_type (type, new_type);
15702 /* If the DIE has a DW_AT_alignment attribute, return its value, doing
15703 appropriate error checking and issuing complaints if there is a
15707 get_alignment (struct dwarf2_cu *cu, struct die_info *die)
15709 struct attribute *attr = dwarf2_attr (die, DW_AT_alignment, cu);
15711 if (attr == nullptr)
15714 if (!attr_form_is_constant (attr))
15716 complaint (_("DW_AT_alignment must have constant form"
15717 " - DIE at %s [in module %s]"),
15718 sect_offset_str (die->sect_off),
15719 objfile_name (cu->per_cu->dwarf2_per_objfile->objfile));
15724 if (attr->form == DW_FORM_sdata)
15726 LONGEST val = DW_SND (attr);
15729 complaint (_("DW_AT_alignment value must not be negative"
15730 " - DIE at %s [in module %s]"),
15731 sect_offset_str (die->sect_off),
15732 objfile_name (cu->per_cu->dwarf2_per_objfile->objfile));
15738 align = DW_UNSND (attr);
15742 complaint (_("DW_AT_alignment value must not be zero"
15743 " - DIE at %s [in module %s]"),
15744 sect_offset_str (die->sect_off),
15745 objfile_name (cu->per_cu->dwarf2_per_objfile->objfile));
15748 if ((align & (align - 1)) != 0)
15750 complaint (_("DW_AT_alignment value must be a power of 2"
15751 " - DIE at %s [in module %s]"),
15752 sect_offset_str (die->sect_off),
15753 objfile_name (cu->per_cu->dwarf2_per_objfile->objfile));
15760 /* If the DIE has a DW_AT_alignment attribute, use its value to set
15761 the alignment for TYPE. */
15764 maybe_set_alignment (struct dwarf2_cu *cu, struct die_info *die,
15767 if (!set_type_align (type, get_alignment (cu, die)))
15768 complaint (_("DW_AT_alignment value too large"
15769 " - DIE at %s [in module %s]"),
15770 sect_offset_str (die->sect_off),
15771 objfile_name (cu->per_cu->dwarf2_per_objfile->objfile));
15774 /* Called when we find the DIE that starts a structure or union scope
15775 (definition) to create a type for the structure or union. Fill in
15776 the type's name and general properties; the members will not be
15777 processed until process_structure_scope. A symbol table entry for
15778 the type will also not be done until process_structure_scope (assuming
15779 the type has a name).
15781 NOTE: we need to call these functions regardless of whether or not the
15782 DIE has a DW_AT_name attribute, since it might be an anonymous
15783 structure or union. This gets the type entered into our set of
15784 user defined types. */
15786 static struct type *
15787 read_structure_type (struct die_info *die, struct dwarf2_cu *cu)
15789 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
15791 struct attribute *attr;
15794 /* If the definition of this type lives in .debug_types, read that type.
15795 Don't follow DW_AT_specification though, that will take us back up
15796 the chain and we want to go down. */
15797 attr = dwarf2_attr_no_follow (die, DW_AT_signature);
15800 type = get_DW_AT_signature_type (die, attr, cu);
15802 /* The type's CU may not be the same as CU.
15803 Ensure TYPE is recorded with CU in die_type_hash. */
15804 return set_die_type (die, type, cu);
15807 type = alloc_type (objfile);
15808 INIT_CPLUS_SPECIFIC (type);
15810 name = dwarf2_name (die, cu);
15813 if (cu->language == language_cplus
15814 || cu->language == language_d
15815 || cu->language == language_rust)
15817 const char *full_name = dwarf2_full_name (name, die, cu);
15819 /* dwarf2_full_name might have already finished building the DIE's
15820 type. If so, there is no need to continue. */
15821 if (get_die_type (die, cu) != NULL)
15822 return get_die_type (die, cu);
15824 TYPE_NAME (type) = full_name;
15828 /* The name is already allocated along with this objfile, so
15829 we don't need to duplicate it for the type. */
15830 TYPE_NAME (type) = name;
15834 if (die->tag == DW_TAG_structure_type)
15836 TYPE_CODE (type) = TYPE_CODE_STRUCT;
15838 else if (die->tag == DW_TAG_union_type)
15840 TYPE_CODE (type) = TYPE_CODE_UNION;
15842 else if (die->tag == DW_TAG_variant_part)
15844 TYPE_CODE (type) = TYPE_CODE_UNION;
15845 TYPE_FLAG_DISCRIMINATED_UNION (type) = 1;
15849 TYPE_CODE (type) = TYPE_CODE_STRUCT;
15852 if (cu->language == language_cplus && die->tag == DW_TAG_class_type)
15853 TYPE_DECLARED_CLASS (type) = 1;
15855 attr = dwarf2_attr (die, DW_AT_byte_size, cu);
15858 if (attr_form_is_constant (attr))
15859 TYPE_LENGTH (type) = DW_UNSND (attr);
15862 /* For the moment, dynamic type sizes are not supported
15863 by GDB's struct type. The actual size is determined
15864 on-demand when resolving the type of a given object,
15865 so set the type's length to zero for now. Otherwise,
15866 we record an expression as the length, and that expression
15867 could lead to a very large value, which could eventually
15868 lead to us trying to allocate that much memory when creating
15869 a value of that type. */
15870 TYPE_LENGTH (type) = 0;
15875 TYPE_LENGTH (type) = 0;
15878 maybe_set_alignment (cu, die, type);
15880 if (producer_is_icc_lt_14 (cu) && (TYPE_LENGTH (type) == 0))
15882 /* ICC<14 does not output the required DW_AT_declaration on
15883 incomplete types, but gives them a size of zero. */
15884 TYPE_STUB (type) = 1;
15887 TYPE_STUB_SUPPORTED (type) = 1;
15889 if (die_is_declaration (die, cu))
15890 TYPE_STUB (type) = 1;
15891 else if (attr == NULL && die->child == NULL
15892 && producer_is_realview (cu->producer))
15893 /* RealView does not output the required DW_AT_declaration
15894 on incomplete types. */
15895 TYPE_STUB (type) = 1;
15897 /* We need to add the type field to the die immediately so we don't
15898 infinitely recurse when dealing with pointers to the structure
15899 type within the structure itself. */
15900 set_die_type (die, type, cu);
15902 /* set_die_type should be already done. */
15903 set_descriptive_type (type, die, cu);
15908 /* A helper for process_structure_scope that handles a single member
15912 handle_struct_member_die (struct die_info *child_die, struct type *type,
15913 struct field_info *fi,
15914 std::vector<struct symbol *> *template_args,
15915 struct dwarf2_cu *cu)
15917 if (child_die->tag == DW_TAG_member
15918 || child_die->tag == DW_TAG_variable
15919 || child_die->tag == DW_TAG_variant_part)
15921 /* NOTE: carlton/2002-11-05: A C++ static data member
15922 should be a DW_TAG_member that is a declaration, but
15923 all versions of G++ as of this writing (so through at
15924 least 3.2.1) incorrectly generate DW_TAG_variable
15925 tags for them instead. */
15926 dwarf2_add_field (fi, child_die, cu);
15928 else if (child_die->tag == DW_TAG_subprogram)
15930 /* Rust doesn't have member functions in the C++ sense.
15931 However, it does emit ordinary functions as children
15932 of a struct DIE. */
15933 if (cu->language == language_rust)
15934 read_func_scope (child_die, cu);
15937 /* C++ member function. */
15938 dwarf2_add_member_fn (fi, child_die, type, cu);
15941 else if (child_die->tag == DW_TAG_inheritance)
15943 /* C++ base class field. */
15944 dwarf2_add_field (fi, child_die, cu);
15946 else if (type_can_define_types (child_die))
15947 dwarf2_add_type_defn (fi, child_die, cu);
15948 else if (child_die->tag == DW_TAG_template_type_param
15949 || child_die->tag == DW_TAG_template_value_param)
15951 struct symbol *arg = new_symbol (child_die, NULL, cu);
15954 template_args->push_back (arg);
15956 else if (child_die->tag == DW_TAG_variant)
15958 /* In a variant we want to get the discriminant and also add a
15959 field for our sole member child. */
15960 struct attribute *discr = dwarf2_attr (child_die, DW_AT_discr_value, cu);
15962 for (struct die_info *variant_child = child_die->child;
15963 variant_child != NULL;
15964 variant_child = sibling_die (variant_child))
15966 if (variant_child->tag == DW_TAG_member)
15968 handle_struct_member_die (variant_child, type, fi,
15969 template_args, cu);
15970 /* Only handle the one. */
15975 /* We don't handle this but we might as well report it if we see
15977 if (dwarf2_attr (child_die, DW_AT_discr_list, cu) != nullptr)
15978 complaint (_("DW_AT_discr_list is not supported yet"
15979 " - DIE at %s [in module %s]"),
15980 sect_offset_str (child_die->sect_off),
15981 objfile_name (cu->per_cu->dwarf2_per_objfile->objfile));
15983 /* The first field was just added, so we can stash the
15984 discriminant there. */
15985 gdb_assert (!fi->fields.empty ());
15987 fi->fields.back ().variant.default_branch = true;
15989 fi->fields.back ().variant.discriminant_value = DW_UNSND (discr);
15993 /* Finish creating a structure or union type, including filling in
15994 its members and creating a symbol for it. */
15997 process_structure_scope (struct die_info *die, struct dwarf2_cu *cu)
15999 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
16000 struct die_info *child_die;
16003 type = get_die_type (die, cu);
16005 type = read_structure_type (die, cu);
16007 /* When reading a DW_TAG_variant_part, we need to notice when we
16008 read the discriminant member, so we can record it later in the
16009 discriminant_info. */
16010 bool is_variant_part = TYPE_FLAG_DISCRIMINATED_UNION (type);
16011 sect_offset discr_offset;
16012 bool has_template_parameters = false;
16014 if (is_variant_part)
16016 struct attribute *discr = dwarf2_attr (die, DW_AT_discr, cu);
16019 /* Maybe it's a univariant form, an extension we support.
16020 In this case arrange not to check the offset. */
16021 is_variant_part = false;
16023 else if (attr_form_is_ref (discr))
16025 struct dwarf2_cu *target_cu = cu;
16026 struct die_info *target_die = follow_die_ref (die, discr, &target_cu);
16028 discr_offset = target_die->sect_off;
16032 complaint (_("DW_AT_discr does not have DIE reference form"
16033 " - DIE at %s [in module %s]"),
16034 sect_offset_str (die->sect_off),
16035 objfile_name (cu->per_cu->dwarf2_per_objfile->objfile));
16036 is_variant_part = false;
16040 if (die->child != NULL && ! die_is_declaration (die, cu))
16042 struct field_info fi;
16043 std::vector<struct symbol *> template_args;
16045 child_die = die->child;
16047 while (child_die && child_die->tag)
16049 handle_struct_member_die (child_die, type, &fi, &template_args, cu);
16051 if (is_variant_part && discr_offset == child_die->sect_off)
16052 fi.fields.back ().variant.is_discriminant = true;
16054 child_die = sibling_die (child_die);
16057 /* Attach template arguments to type. */
16058 if (!template_args.empty ())
16060 has_template_parameters = true;
16061 ALLOCATE_CPLUS_STRUCT_TYPE (type);
16062 TYPE_N_TEMPLATE_ARGUMENTS (type) = template_args.size ();
16063 TYPE_TEMPLATE_ARGUMENTS (type)
16064 = XOBNEWVEC (&objfile->objfile_obstack,
16066 TYPE_N_TEMPLATE_ARGUMENTS (type));
16067 memcpy (TYPE_TEMPLATE_ARGUMENTS (type),
16068 template_args.data (),
16069 (TYPE_N_TEMPLATE_ARGUMENTS (type)
16070 * sizeof (struct symbol *)));
16073 /* Attach fields and member functions to the type. */
16075 dwarf2_attach_fields_to_type (&fi, type, cu);
16076 if (!fi.fnfieldlists.empty ())
16078 dwarf2_attach_fn_fields_to_type (&fi, type, cu);
16080 /* Get the type which refers to the base class (possibly this
16081 class itself) which contains the vtable pointer for the current
16082 class from the DW_AT_containing_type attribute. This use of
16083 DW_AT_containing_type is a GNU extension. */
16085 if (dwarf2_attr (die, DW_AT_containing_type, cu) != NULL)
16087 struct type *t = die_containing_type (die, cu);
16089 set_type_vptr_basetype (type, t);
16094 /* Our own class provides vtbl ptr. */
16095 for (i = TYPE_NFIELDS (t) - 1;
16096 i >= TYPE_N_BASECLASSES (t);
16099 const char *fieldname = TYPE_FIELD_NAME (t, i);
16101 if (is_vtable_name (fieldname, cu))
16103 set_type_vptr_fieldno (type, i);
16108 /* Complain if virtual function table field not found. */
16109 if (i < TYPE_N_BASECLASSES (t))
16110 complaint (_("virtual function table pointer "
16111 "not found when defining class '%s'"),
16112 TYPE_NAME (type) ? TYPE_NAME (type) : "");
16116 set_type_vptr_fieldno (type, TYPE_VPTR_FIELDNO (t));
16119 else if (cu->producer
16120 && startswith (cu->producer, "IBM(R) XL C/C++ Advanced Edition"))
16122 /* The IBM XLC compiler does not provide direct indication
16123 of the containing type, but the vtable pointer is
16124 always named __vfp. */
16128 for (i = TYPE_NFIELDS (type) - 1;
16129 i >= TYPE_N_BASECLASSES (type);
16132 if (strcmp (TYPE_FIELD_NAME (type, i), "__vfp") == 0)
16134 set_type_vptr_fieldno (type, i);
16135 set_type_vptr_basetype (type, type);
16142 /* Copy fi.typedef_field_list linked list elements content into the
16143 allocated array TYPE_TYPEDEF_FIELD_ARRAY (type). */
16144 if (!fi.typedef_field_list.empty ())
16146 int count = fi.typedef_field_list.size ();
16148 ALLOCATE_CPLUS_STRUCT_TYPE (type);
16149 TYPE_TYPEDEF_FIELD_ARRAY (type)
16150 = ((struct decl_field *)
16152 sizeof (TYPE_TYPEDEF_FIELD (type, 0)) * count));
16153 TYPE_TYPEDEF_FIELD_COUNT (type) = count;
16155 for (int i = 0; i < fi.typedef_field_list.size (); ++i)
16156 TYPE_TYPEDEF_FIELD (type, i) = fi.typedef_field_list[i];
16159 /* Copy fi.nested_types_list linked list elements content into the
16160 allocated array TYPE_NESTED_TYPES_ARRAY (type). */
16161 if (!fi.nested_types_list.empty () && cu->language != language_ada)
16163 int count = fi.nested_types_list.size ();
16165 ALLOCATE_CPLUS_STRUCT_TYPE (type);
16166 TYPE_NESTED_TYPES_ARRAY (type)
16167 = ((struct decl_field *)
16168 TYPE_ALLOC (type, sizeof (struct decl_field) * count));
16169 TYPE_NESTED_TYPES_COUNT (type) = count;
16171 for (int i = 0; i < fi.nested_types_list.size (); ++i)
16172 TYPE_NESTED_TYPES_FIELD (type, i) = fi.nested_types_list[i];
16176 quirk_gcc_member_function_pointer (type, objfile);
16177 if (cu->language == language_rust && die->tag == DW_TAG_union_type)
16178 cu->rust_unions.push_back (type);
16180 /* NOTE: carlton/2004-03-16: GCC 3.4 (or at least one of its
16181 snapshots) has been known to create a die giving a declaration
16182 for a class that has, as a child, a die giving a definition for a
16183 nested class. So we have to process our children even if the
16184 current die is a declaration. Normally, of course, a declaration
16185 won't have any children at all. */
16187 child_die = die->child;
16189 while (child_die != NULL && child_die->tag)
16191 if (child_die->tag == DW_TAG_member
16192 || child_die->tag == DW_TAG_variable
16193 || child_die->tag == DW_TAG_inheritance
16194 || child_die->tag == DW_TAG_template_value_param
16195 || child_die->tag == DW_TAG_template_type_param)
16200 process_die (child_die, cu);
16202 child_die = sibling_die (child_die);
16205 /* Do not consider external references. According to the DWARF standard,
16206 these DIEs are identified by the fact that they have no byte_size
16207 attribute, and a declaration attribute. */
16208 if (dwarf2_attr (die, DW_AT_byte_size, cu) != NULL
16209 || !die_is_declaration (die, cu))
16211 struct symbol *sym = new_symbol (die, type, cu);
16213 if (has_template_parameters)
16215 /* Make sure that the symtab is set on the new symbols.
16216 Even though they don't appear in this symtab directly,
16217 other parts of gdb assume that symbols do, and this is
16218 reasonably true. */
16219 for (int i = 0; i < TYPE_N_TEMPLATE_ARGUMENTS (type); ++i)
16220 symbol_set_symtab (TYPE_TEMPLATE_ARGUMENT (type, i),
16221 symbol_symtab (sym));
16226 /* Assuming DIE is an enumeration type, and TYPE is its associated type,
16227 update TYPE using some information only available in DIE's children. */
16230 update_enumeration_type_from_children (struct die_info *die,
16232 struct dwarf2_cu *cu)
16234 struct die_info *child_die;
16235 int unsigned_enum = 1;
16239 auto_obstack obstack;
16241 for (child_die = die->child;
16242 child_die != NULL && child_die->tag;
16243 child_die = sibling_die (child_die))
16245 struct attribute *attr;
16247 const gdb_byte *bytes;
16248 struct dwarf2_locexpr_baton *baton;
16251 if (child_die->tag != DW_TAG_enumerator)
16254 attr = dwarf2_attr (child_die, DW_AT_const_value, cu);
16258 name = dwarf2_name (child_die, cu);
16260 name = "<anonymous enumerator>";
16262 dwarf2_const_value_attr (attr, type, name, &obstack, cu,
16263 &value, &bytes, &baton);
16269 else if ((mask & value) != 0)
16274 /* If we already know that the enum type is neither unsigned, nor
16275 a flag type, no need to look at the rest of the enumerates. */
16276 if (!unsigned_enum && !flag_enum)
16281 TYPE_UNSIGNED (type) = 1;
16283 TYPE_FLAG_ENUM (type) = 1;
16286 /* Given a DW_AT_enumeration_type die, set its type. We do not
16287 complete the type's fields yet, or create any symbols. */
16289 static struct type *
16290 read_enumeration_type (struct die_info *die, struct dwarf2_cu *cu)
16292 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
16294 struct attribute *attr;
16297 /* If the definition of this type lives in .debug_types, read that type.
16298 Don't follow DW_AT_specification though, that will take us back up
16299 the chain and we want to go down. */
16300 attr = dwarf2_attr_no_follow (die, DW_AT_signature);
16303 type = get_DW_AT_signature_type (die, attr, cu);
16305 /* The type's CU may not be the same as CU.
16306 Ensure TYPE is recorded with CU in die_type_hash. */
16307 return set_die_type (die, type, cu);
16310 type = alloc_type (objfile);
16312 TYPE_CODE (type) = TYPE_CODE_ENUM;
16313 name = dwarf2_full_name (NULL, die, cu);
16315 TYPE_NAME (type) = name;
16317 attr = dwarf2_attr (die, DW_AT_type, cu);
16320 struct type *underlying_type = die_type (die, cu);
16322 TYPE_TARGET_TYPE (type) = underlying_type;
16325 attr = dwarf2_attr (die, DW_AT_byte_size, cu);
16328 TYPE_LENGTH (type) = DW_UNSND (attr);
16332 TYPE_LENGTH (type) = 0;
16335 maybe_set_alignment (cu, die, type);
16337 /* The enumeration DIE can be incomplete. In Ada, any type can be
16338 declared as private in the package spec, and then defined only
16339 inside the package body. Such types are known as Taft Amendment
16340 Types. When another package uses such a type, an incomplete DIE
16341 may be generated by the compiler. */
16342 if (die_is_declaration (die, cu))
16343 TYPE_STUB (type) = 1;
16345 /* Finish the creation of this type by using the enum's children.
16346 We must call this even when the underlying type has been provided
16347 so that we can determine if we're looking at a "flag" enum. */
16348 update_enumeration_type_from_children (die, type, cu);
16350 /* If this type has an underlying type that is not a stub, then we
16351 may use its attributes. We always use the "unsigned" attribute
16352 in this situation, because ordinarily we guess whether the type
16353 is unsigned -- but the guess can be wrong and the underlying type
16354 can tell us the reality. However, we defer to a local size
16355 attribute if one exists, because this lets the compiler override
16356 the underlying type if needed. */
16357 if (TYPE_TARGET_TYPE (type) != NULL && !TYPE_STUB (TYPE_TARGET_TYPE (type)))
16359 TYPE_UNSIGNED (type) = TYPE_UNSIGNED (TYPE_TARGET_TYPE (type));
16360 if (TYPE_LENGTH (type) == 0)
16361 TYPE_LENGTH (type) = TYPE_LENGTH (TYPE_TARGET_TYPE (type));
16362 if (TYPE_RAW_ALIGN (type) == 0
16363 && TYPE_RAW_ALIGN (TYPE_TARGET_TYPE (type)) != 0)
16364 set_type_align (type, TYPE_RAW_ALIGN (TYPE_TARGET_TYPE (type)));
16367 TYPE_DECLARED_CLASS (type) = dwarf2_flag_true_p (die, DW_AT_enum_class, cu);
16369 return set_die_type (die, type, cu);
16372 /* Given a pointer to a die which begins an enumeration, process all
16373 the dies that define the members of the enumeration, and create the
16374 symbol for the enumeration type.
16376 NOTE: We reverse the order of the element list. */
16379 process_enumeration_scope (struct die_info *die, struct dwarf2_cu *cu)
16381 struct type *this_type;
16383 this_type = get_die_type (die, cu);
16384 if (this_type == NULL)
16385 this_type = read_enumeration_type (die, cu);
16387 if (die->child != NULL)
16389 struct die_info *child_die;
16390 struct symbol *sym;
16391 struct field *fields = NULL;
16392 int num_fields = 0;
16395 child_die = die->child;
16396 while (child_die && child_die->tag)
16398 if (child_die->tag != DW_TAG_enumerator)
16400 process_die (child_die, cu);
16404 name = dwarf2_name (child_die, cu);
16407 sym = new_symbol (child_die, this_type, cu);
16409 if ((num_fields % DW_FIELD_ALLOC_CHUNK) == 0)
16411 fields = (struct field *)
16413 (num_fields + DW_FIELD_ALLOC_CHUNK)
16414 * sizeof (struct field));
16417 FIELD_NAME (fields[num_fields]) = SYMBOL_LINKAGE_NAME (sym);
16418 FIELD_TYPE (fields[num_fields]) = NULL;
16419 SET_FIELD_ENUMVAL (fields[num_fields], SYMBOL_VALUE (sym));
16420 FIELD_BITSIZE (fields[num_fields]) = 0;
16426 child_die = sibling_die (child_die);
16431 TYPE_NFIELDS (this_type) = num_fields;
16432 TYPE_FIELDS (this_type) = (struct field *)
16433 TYPE_ALLOC (this_type, sizeof (struct field) * num_fields);
16434 memcpy (TYPE_FIELDS (this_type), fields,
16435 sizeof (struct field) * num_fields);
16440 /* If we are reading an enum from a .debug_types unit, and the enum
16441 is a declaration, and the enum is not the signatured type in the
16442 unit, then we do not want to add a symbol for it. Adding a
16443 symbol would in some cases obscure the true definition of the
16444 enum, giving users an incomplete type when the definition is
16445 actually available. Note that we do not want to do this for all
16446 enums which are just declarations, because C++0x allows forward
16447 enum declarations. */
16448 if (cu->per_cu->is_debug_types
16449 && die_is_declaration (die, cu))
16451 struct signatured_type *sig_type;
16453 sig_type = (struct signatured_type *) cu->per_cu;
16454 gdb_assert (to_underlying (sig_type->type_offset_in_section) != 0);
16455 if (sig_type->type_offset_in_section != die->sect_off)
16459 new_symbol (die, this_type, cu);
16462 /* Extract all information from a DW_TAG_array_type DIE and put it in
16463 the DIE's type field. For now, this only handles one dimensional
16466 static struct type *
16467 read_array_type (struct die_info *die, struct dwarf2_cu *cu)
16469 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
16470 struct die_info *child_die;
16472 struct type *element_type, *range_type, *index_type;
16473 struct attribute *attr;
16475 struct dynamic_prop *byte_stride_prop = NULL;
16476 unsigned int bit_stride = 0;
16478 element_type = die_type (die, cu);
16480 /* The die_type call above may have already set the type for this DIE. */
16481 type = get_die_type (die, cu);
16485 attr = dwarf2_attr (die, DW_AT_byte_stride, cu);
16491 = (struct dynamic_prop *) alloca (sizeof (struct dynamic_prop));
16492 stride_ok = attr_to_dynamic_prop (attr, die, cu, byte_stride_prop);
16495 complaint (_("unable to read array DW_AT_byte_stride "
16496 " - DIE at %s [in module %s]"),
16497 sect_offset_str (die->sect_off),
16498 objfile_name (cu->per_cu->dwarf2_per_objfile->objfile));
16499 /* Ignore this attribute. We will likely not be able to print
16500 arrays of this type correctly, but there is little we can do
16501 to help if we cannot read the attribute's value. */
16502 byte_stride_prop = NULL;
16506 attr = dwarf2_attr (die, DW_AT_bit_stride, cu);
16508 bit_stride = DW_UNSND (attr);
16510 /* Irix 6.2 native cc creates array types without children for
16511 arrays with unspecified length. */
16512 if (die->child == NULL)
16514 index_type = objfile_type (objfile)->builtin_int;
16515 range_type = create_static_range_type (NULL, index_type, 0, -1);
16516 type = create_array_type_with_stride (NULL, element_type, range_type,
16517 byte_stride_prop, bit_stride);
16518 return set_die_type (die, type, cu);
16521 std::vector<struct type *> range_types;
16522 child_die = die->child;
16523 while (child_die && child_die->tag)
16525 if (child_die->tag == DW_TAG_subrange_type)
16527 struct type *child_type = read_type_die (child_die, cu);
16529 if (child_type != NULL)
16531 /* The range type was succesfully read. Save it for the
16532 array type creation. */
16533 range_types.push_back (child_type);
16536 child_die = sibling_die (child_die);
16539 /* Dwarf2 dimensions are output from left to right, create the
16540 necessary array types in backwards order. */
16542 type = element_type;
16544 if (read_array_order (die, cu) == DW_ORD_col_major)
16548 while (i < range_types.size ())
16549 type = create_array_type_with_stride (NULL, type, range_types[i++],
16550 byte_stride_prop, bit_stride);
16554 size_t ndim = range_types.size ();
16556 type = create_array_type_with_stride (NULL, type, range_types[ndim],
16557 byte_stride_prop, bit_stride);
16560 /* Understand Dwarf2 support for vector types (like they occur on
16561 the PowerPC w/ AltiVec). Gcc just adds another attribute to the
16562 array type. This is not part of the Dwarf2/3 standard yet, but a
16563 custom vendor extension. The main difference between a regular
16564 array and the vector variant is that vectors are passed by value
16566 attr = dwarf2_attr (die, DW_AT_GNU_vector, cu);
16568 make_vector_type (type);
16570 /* The DIE may have DW_AT_byte_size set. For example an OpenCL
16571 implementation may choose to implement triple vectors using this
16573 attr = dwarf2_attr (die, DW_AT_byte_size, cu);
16576 if (DW_UNSND (attr) >= TYPE_LENGTH (type))
16577 TYPE_LENGTH (type) = DW_UNSND (attr);
16579 complaint (_("DW_AT_byte_size for array type smaller "
16580 "than the total size of elements"));
16583 name = dwarf2_name (die, cu);
16585 TYPE_NAME (type) = name;
16587 maybe_set_alignment (cu, die, type);
16589 /* Install the type in the die. */
16590 set_die_type (die, type, cu);
16592 /* set_die_type should be already done. */
16593 set_descriptive_type (type, die, cu);
16598 static enum dwarf_array_dim_ordering
16599 read_array_order (struct die_info *die, struct dwarf2_cu *cu)
16601 struct attribute *attr;
16603 attr = dwarf2_attr (die, DW_AT_ordering, cu);
16606 return (enum dwarf_array_dim_ordering) DW_SND (attr);
16608 /* GNU F77 is a special case, as at 08/2004 array type info is the
16609 opposite order to the dwarf2 specification, but data is still
16610 laid out as per normal fortran.
16612 FIXME: dsl/2004-8-20: If G77 is ever fixed, this will also need
16613 version checking. */
16615 if (cu->language == language_fortran
16616 && cu->producer && strstr (cu->producer, "GNU F77"))
16618 return DW_ORD_row_major;
16621 switch (cu->language_defn->la_array_ordering)
16623 case array_column_major:
16624 return DW_ORD_col_major;
16625 case array_row_major:
16627 return DW_ORD_row_major;
16631 /* Extract all information from a DW_TAG_set_type DIE and put it in
16632 the DIE's type field. */
16634 static struct type *
16635 read_set_type (struct die_info *die, struct dwarf2_cu *cu)
16637 struct type *domain_type, *set_type;
16638 struct attribute *attr;
16640 domain_type = die_type (die, cu);
16642 /* The die_type call above may have already set the type for this DIE. */
16643 set_type = get_die_type (die, cu);
16647 set_type = create_set_type (NULL, domain_type);
16649 attr = dwarf2_attr (die, DW_AT_byte_size, cu);
16651 TYPE_LENGTH (set_type) = DW_UNSND (attr);
16653 maybe_set_alignment (cu, die, set_type);
16655 return set_die_type (die, set_type, cu);
16658 /* A helper for read_common_block that creates a locexpr baton.
16659 SYM is the symbol which we are marking as computed.
16660 COMMON_DIE is the DIE for the common block.
16661 COMMON_LOC is the location expression attribute for the common
16663 MEMBER_LOC is the location expression attribute for the particular
16664 member of the common block that we are processing.
16665 CU is the CU from which the above come. */
16668 mark_common_block_symbol_computed (struct symbol *sym,
16669 struct die_info *common_die,
16670 struct attribute *common_loc,
16671 struct attribute *member_loc,
16672 struct dwarf2_cu *cu)
16674 struct dwarf2_per_objfile *dwarf2_per_objfile
16675 = cu->per_cu->dwarf2_per_objfile;
16676 struct objfile *objfile = dwarf2_per_objfile->objfile;
16677 struct dwarf2_locexpr_baton *baton;
16679 unsigned int cu_off;
16680 enum bfd_endian byte_order = gdbarch_byte_order (get_objfile_arch (objfile));
16681 LONGEST offset = 0;
16683 gdb_assert (common_loc && member_loc);
16684 gdb_assert (attr_form_is_block (common_loc));
16685 gdb_assert (attr_form_is_block (member_loc)
16686 || attr_form_is_constant (member_loc));
16688 baton = XOBNEW (&objfile->objfile_obstack, struct dwarf2_locexpr_baton);
16689 baton->per_cu = cu->per_cu;
16690 gdb_assert (baton->per_cu);
16692 baton->size = 5 /* DW_OP_call4 */ + 1 /* DW_OP_plus */;
16694 if (attr_form_is_constant (member_loc))
16696 offset = dwarf2_get_attr_constant_value (member_loc, 0);
16697 baton->size += 1 /* DW_OP_addr */ + cu->header.addr_size;
16700 baton->size += DW_BLOCK (member_loc)->size;
16702 ptr = (gdb_byte *) obstack_alloc (&objfile->objfile_obstack, baton->size);
16705 *ptr++ = DW_OP_call4;
16706 cu_off = common_die->sect_off - cu->per_cu->sect_off;
16707 store_unsigned_integer (ptr, 4, byte_order, cu_off);
16710 if (attr_form_is_constant (member_loc))
16712 *ptr++ = DW_OP_addr;
16713 store_unsigned_integer (ptr, cu->header.addr_size, byte_order, offset);
16714 ptr += cu->header.addr_size;
16718 /* We have to copy the data here, because DW_OP_call4 will only
16719 use a DW_AT_location attribute. */
16720 memcpy (ptr, DW_BLOCK (member_loc)->data, DW_BLOCK (member_loc)->size);
16721 ptr += DW_BLOCK (member_loc)->size;
16724 *ptr++ = DW_OP_plus;
16725 gdb_assert (ptr - baton->data == baton->size);
16727 SYMBOL_LOCATION_BATON (sym) = baton;
16728 SYMBOL_ACLASS_INDEX (sym) = dwarf2_locexpr_index;
16731 /* Create appropriate locally-scoped variables for all the
16732 DW_TAG_common_block entries. Also create a struct common_block
16733 listing all such variables for `info common'. COMMON_BLOCK_DOMAIN
16734 is used to sepate the common blocks name namespace from regular
16738 read_common_block (struct die_info *die, struct dwarf2_cu *cu)
16740 struct attribute *attr;
16742 attr = dwarf2_attr (die, DW_AT_location, cu);
16745 /* Support the .debug_loc offsets. */
16746 if (attr_form_is_block (attr))
16750 else if (attr_form_is_section_offset (attr))
16752 dwarf2_complex_location_expr_complaint ();
16757 dwarf2_invalid_attrib_class_complaint ("DW_AT_location",
16758 "common block member");
16763 if (die->child != NULL)
16765 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
16766 struct die_info *child_die;
16767 size_t n_entries = 0, size;
16768 struct common_block *common_block;
16769 struct symbol *sym;
16771 for (child_die = die->child;
16772 child_die && child_die->tag;
16773 child_die = sibling_die (child_die))
16776 size = (sizeof (struct common_block)
16777 + (n_entries - 1) * sizeof (struct symbol *));
16779 = (struct common_block *) obstack_alloc (&objfile->objfile_obstack,
16781 memset (common_block->contents, 0, n_entries * sizeof (struct symbol *));
16782 common_block->n_entries = 0;
16784 for (child_die = die->child;
16785 child_die && child_die->tag;
16786 child_die = sibling_die (child_die))
16788 /* Create the symbol in the DW_TAG_common_block block in the current
16790 sym = new_symbol (child_die, NULL, cu);
16793 struct attribute *member_loc;
16795 common_block->contents[common_block->n_entries++] = sym;
16797 member_loc = dwarf2_attr (child_die, DW_AT_data_member_location,
16801 /* GDB has handled this for a long time, but it is
16802 not specified by DWARF. It seems to have been
16803 emitted by gfortran at least as recently as:
16804 http://gcc.gnu.org/bugzilla/show_bug.cgi?id=23057. */
16805 complaint (_("Variable in common block has "
16806 "DW_AT_data_member_location "
16807 "- DIE at %s [in module %s]"),
16808 sect_offset_str (child_die->sect_off),
16809 objfile_name (objfile));
16811 if (attr_form_is_section_offset (member_loc))
16812 dwarf2_complex_location_expr_complaint ();
16813 else if (attr_form_is_constant (member_loc)
16814 || attr_form_is_block (member_loc))
16817 mark_common_block_symbol_computed (sym, die, attr,
16821 dwarf2_complex_location_expr_complaint ();
16826 sym = new_symbol (die, objfile_type (objfile)->builtin_void, cu);
16827 SYMBOL_VALUE_COMMON_BLOCK (sym) = common_block;
16831 /* Create a type for a C++ namespace. */
16833 static struct type *
16834 read_namespace_type (struct die_info *die, struct dwarf2_cu *cu)
16836 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
16837 const char *previous_prefix, *name;
16841 /* For extensions, reuse the type of the original namespace. */
16842 if (dwarf2_attr (die, DW_AT_extension, cu) != NULL)
16844 struct die_info *ext_die;
16845 struct dwarf2_cu *ext_cu = cu;
16847 ext_die = dwarf2_extension (die, &ext_cu);
16848 type = read_type_die (ext_die, ext_cu);
16850 /* EXT_CU may not be the same as CU.
16851 Ensure TYPE is recorded with CU in die_type_hash. */
16852 return set_die_type (die, type, cu);
16855 name = namespace_name (die, &is_anonymous, cu);
16857 /* Now build the name of the current namespace. */
16859 previous_prefix = determine_prefix (die, cu);
16860 if (previous_prefix[0] != '\0')
16861 name = typename_concat (&objfile->objfile_obstack,
16862 previous_prefix, name, 0, cu);
16864 /* Create the type. */
16865 type = init_type (objfile, TYPE_CODE_NAMESPACE, 0, name);
16867 return set_die_type (die, type, cu);
16870 /* Read a namespace scope. */
16873 read_namespace (struct die_info *die, struct dwarf2_cu *cu)
16875 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
16878 /* Add a symbol associated to this if we haven't seen the namespace
16879 before. Also, add a using directive if it's an anonymous
16882 if (dwarf2_attr (die, DW_AT_extension, cu) == NULL)
16886 type = read_type_die (die, cu);
16887 new_symbol (die, type, cu);
16889 namespace_name (die, &is_anonymous, cu);
16892 const char *previous_prefix = determine_prefix (die, cu);
16894 std::vector<const char *> excludes;
16895 add_using_directive (using_directives (cu),
16896 previous_prefix, TYPE_NAME (type), NULL,
16897 NULL, excludes, 0, &objfile->objfile_obstack);
16901 if (die->child != NULL)
16903 struct die_info *child_die = die->child;
16905 while (child_die && child_die->tag)
16907 process_die (child_die, cu);
16908 child_die = sibling_die (child_die);
16913 /* Read a Fortran module as type. This DIE can be only a declaration used for
16914 imported module. Still we need that type as local Fortran "use ... only"
16915 declaration imports depend on the created type in determine_prefix. */
16917 static struct type *
16918 read_module_type (struct die_info *die, struct dwarf2_cu *cu)
16920 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
16921 const char *module_name;
16924 module_name = dwarf2_name (die, cu);
16926 complaint (_("DW_TAG_module has no name, offset %s"),
16927 sect_offset_str (die->sect_off));
16928 type = init_type (objfile, TYPE_CODE_MODULE, 0, module_name);
16930 return set_die_type (die, type, cu);
16933 /* Read a Fortran module. */
16936 read_module (struct die_info *die, struct dwarf2_cu *cu)
16938 struct die_info *child_die = die->child;
16941 type = read_type_die (die, cu);
16942 new_symbol (die, type, cu);
16944 while (child_die && child_die->tag)
16946 process_die (child_die, cu);
16947 child_die = sibling_die (child_die);
16951 /* Return the name of the namespace represented by DIE. Set
16952 *IS_ANONYMOUS to tell whether or not the namespace is an anonymous
16955 static const char *
16956 namespace_name (struct die_info *die, int *is_anonymous, struct dwarf2_cu *cu)
16958 struct die_info *current_die;
16959 const char *name = NULL;
16961 /* Loop through the extensions until we find a name. */
16963 for (current_die = die;
16964 current_die != NULL;
16965 current_die = dwarf2_extension (die, &cu))
16967 /* We don't use dwarf2_name here so that we can detect the absence
16968 of a name -> anonymous namespace. */
16969 name = dwarf2_string_attr (die, DW_AT_name, cu);
16975 /* Is it an anonymous namespace? */
16977 *is_anonymous = (name == NULL);
16979 name = CP_ANONYMOUS_NAMESPACE_STR;
16984 /* Extract all information from a DW_TAG_pointer_type DIE and add to
16985 the user defined type vector. */
16987 static struct type *
16988 read_tag_pointer_type (struct die_info *die, struct dwarf2_cu *cu)
16990 struct gdbarch *gdbarch
16991 = get_objfile_arch (cu->per_cu->dwarf2_per_objfile->objfile);
16992 struct comp_unit_head *cu_header = &cu->header;
16994 struct attribute *attr_byte_size;
16995 struct attribute *attr_address_class;
16996 int byte_size, addr_class;
16997 struct type *target_type;
16999 target_type = die_type (die, cu);
17001 /* The die_type call above may have already set the type for this DIE. */
17002 type = get_die_type (die, cu);
17006 type = lookup_pointer_type (target_type);
17008 attr_byte_size = dwarf2_attr (die, DW_AT_byte_size, cu);
17009 if (attr_byte_size)
17010 byte_size = DW_UNSND (attr_byte_size);
17012 byte_size = cu_header->addr_size;
17014 attr_address_class = dwarf2_attr (die, DW_AT_address_class, cu);
17015 if (attr_address_class)
17016 addr_class = DW_UNSND (attr_address_class);
17018 addr_class = DW_ADDR_none;
17020 ULONGEST alignment = get_alignment (cu, die);
17022 /* If the pointer size, alignment, or address class is different
17023 than the default, create a type variant marked as such and set
17024 the length accordingly. */
17025 if (TYPE_LENGTH (type) != byte_size
17026 || (alignment != 0 && TYPE_RAW_ALIGN (type) != 0
17027 && alignment != TYPE_RAW_ALIGN (type))
17028 || addr_class != DW_ADDR_none)
17030 if (gdbarch_address_class_type_flags_p (gdbarch))
17034 type_flags = gdbarch_address_class_type_flags
17035 (gdbarch, byte_size, addr_class);
17036 gdb_assert ((type_flags & ~TYPE_INSTANCE_FLAG_ADDRESS_CLASS_ALL)
17038 type = make_type_with_address_space (type, type_flags);
17040 else if (TYPE_LENGTH (type) != byte_size)
17042 complaint (_("invalid pointer size %d"), byte_size);
17044 else if (TYPE_RAW_ALIGN (type) != alignment)
17046 complaint (_("Invalid DW_AT_alignment"
17047 " - DIE at %s [in module %s]"),
17048 sect_offset_str (die->sect_off),
17049 objfile_name (cu->per_cu->dwarf2_per_objfile->objfile));
17053 /* Should we also complain about unhandled address classes? */
17057 TYPE_LENGTH (type) = byte_size;
17058 set_type_align (type, alignment);
17059 return set_die_type (die, type, cu);
17062 /* Extract all information from a DW_TAG_ptr_to_member_type DIE and add to
17063 the user defined type vector. */
17065 static struct type *
17066 read_tag_ptr_to_member_type (struct die_info *die, struct dwarf2_cu *cu)
17069 struct type *to_type;
17070 struct type *domain;
17072 to_type = die_type (die, cu);
17073 domain = die_containing_type (die, cu);
17075 /* The calls above may have already set the type for this DIE. */
17076 type = get_die_type (die, cu);
17080 if (TYPE_CODE (check_typedef (to_type)) == TYPE_CODE_METHOD)
17081 type = lookup_methodptr_type (to_type);
17082 else if (TYPE_CODE (check_typedef (to_type)) == TYPE_CODE_FUNC)
17084 struct type *new_type
17085 = alloc_type (cu->per_cu->dwarf2_per_objfile->objfile);
17087 smash_to_method_type (new_type, domain, TYPE_TARGET_TYPE (to_type),
17088 TYPE_FIELDS (to_type), TYPE_NFIELDS (to_type),
17089 TYPE_VARARGS (to_type));
17090 type = lookup_methodptr_type (new_type);
17093 type = lookup_memberptr_type (to_type, domain);
17095 return set_die_type (die, type, cu);
17098 /* Extract all information from a DW_TAG_{rvalue_,}reference_type DIE and add to
17099 the user defined type vector. */
17101 static struct type *
17102 read_tag_reference_type (struct die_info *die, struct dwarf2_cu *cu,
17103 enum type_code refcode)
17105 struct comp_unit_head *cu_header = &cu->header;
17106 struct type *type, *target_type;
17107 struct attribute *attr;
17109 gdb_assert (refcode == TYPE_CODE_REF || refcode == TYPE_CODE_RVALUE_REF);
17111 target_type = die_type (die, cu);
17113 /* The die_type call above may have already set the type for this DIE. */
17114 type = get_die_type (die, cu);
17118 type = lookup_reference_type (target_type, refcode);
17119 attr = dwarf2_attr (die, DW_AT_byte_size, cu);
17122 TYPE_LENGTH (type) = DW_UNSND (attr);
17126 TYPE_LENGTH (type) = cu_header->addr_size;
17128 maybe_set_alignment (cu, die, type);
17129 return set_die_type (die, type, cu);
17132 /* Add the given cv-qualifiers to the element type of the array. GCC
17133 outputs DWARF type qualifiers that apply to an array, not the
17134 element type. But GDB relies on the array element type to carry
17135 the cv-qualifiers. This mimics section 6.7.3 of the C99
17138 static struct type *
17139 add_array_cv_type (struct die_info *die, struct dwarf2_cu *cu,
17140 struct type *base_type, int cnst, int voltl)
17142 struct type *el_type, *inner_array;
17144 base_type = copy_type (base_type);
17145 inner_array = base_type;
17147 while (TYPE_CODE (TYPE_TARGET_TYPE (inner_array)) == TYPE_CODE_ARRAY)
17149 TYPE_TARGET_TYPE (inner_array) =
17150 copy_type (TYPE_TARGET_TYPE (inner_array));
17151 inner_array = TYPE_TARGET_TYPE (inner_array);
17154 el_type = TYPE_TARGET_TYPE (inner_array);
17155 cnst |= TYPE_CONST (el_type);
17156 voltl |= TYPE_VOLATILE (el_type);
17157 TYPE_TARGET_TYPE (inner_array) = make_cv_type (cnst, voltl, el_type, NULL);
17159 return set_die_type (die, base_type, cu);
17162 static struct type *
17163 read_tag_const_type (struct die_info *die, struct dwarf2_cu *cu)
17165 struct type *base_type, *cv_type;
17167 base_type = die_type (die, cu);
17169 /* The die_type call above may have already set the type for this DIE. */
17170 cv_type = get_die_type (die, cu);
17174 /* In case the const qualifier is applied to an array type, the element type
17175 is so qualified, not the array type (section 6.7.3 of C99). */
17176 if (TYPE_CODE (base_type) == TYPE_CODE_ARRAY)
17177 return add_array_cv_type (die, cu, base_type, 1, 0);
17179 cv_type = make_cv_type (1, TYPE_VOLATILE (base_type), base_type, 0);
17180 return set_die_type (die, cv_type, cu);
17183 static struct type *
17184 read_tag_volatile_type (struct die_info *die, struct dwarf2_cu *cu)
17186 struct type *base_type, *cv_type;
17188 base_type = die_type (die, cu);
17190 /* The die_type call above may have already set the type for this DIE. */
17191 cv_type = get_die_type (die, cu);
17195 /* In case the volatile qualifier is applied to an array type, the
17196 element type is so qualified, not the array type (section 6.7.3
17198 if (TYPE_CODE (base_type) == TYPE_CODE_ARRAY)
17199 return add_array_cv_type (die, cu, base_type, 0, 1);
17201 cv_type = make_cv_type (TYPE_CONST (base_type), 1, base_type, 0);
17202 return set_die_type (die, cv_type, cu);
17205 /* Handle DW_TAG_restrict_type. */
17207 static struct type *
17208 read_tag_restrict_type (struct die_info *die, struct dwarf2_cu *cu)
17210 struct type *base_type, *cv_type;
17212 base_type = die_type (die, cu);
17214 /* The die_type call above may have already set the type for this DIE. */
17215 cv_type = get_die_type (die, cu);
17219 cv_type = make_restrict_type (base_type);
17220 return set_die_type (die, cv_type, cu);
17223 /* Handle DW_TAG_atomic_type. */
17225 static struct type *
17226 read_tag_atomic_type (struct die_info *die, struct dwarf2_cu *cu)
17228 struct type *base_type, *cv_type;
17230 base_type = die_type (die, cu);
17232 /* The die_type call above may have already set the type for this DIE. */
17233 cv_type = get_die_type (die, cu);
17237 cv_type = make_atomic_type (base_type);
17238 return set_die_type (die, cv_type, cu);
17241 /* Extract all information from a DW_TAG_string_type DIE and add to
17242 the user defined type vector. It isn't really a user defined type,
17243 but it behaves like one, with other DIE's using an AT_user_def_type
17244 attribute to reference it. */
17246 static struct type *
17247 read_tag_string_type (struct die_info *die, struct dwarf2_cu *cu)
17249 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
17250 struct gdbarch *gdbarch = get_objfile_arch (objfile);
17251 struct type *type, *range_type, *index_type, *char_type;
17252 struct attribute *attr;
17253 unsigned int length;
17255 attr = dwarf2_attr (die, DW_AT_string_length, cu);
17258 length = DW_UNSND (attr);
17262 /* Check for the DW_AT_byte_size attribute. */
17263 attr = dwarf2_attr (die, DW_AT_byte_size, cu);
17266 length = DW_UNSND (attr);
17274 index_type = objfile_type (objfile)->builtin_int;
17275 range_type = create_static_range_type (NULL, index_type, 1, length);
17276 char_type = language_string_char_type (cu->language_defn, gdbarch);
17277 type = create_string_type (NULL, char_type, range_type);
17279 return set_die_type (die, type, cu);
17282 /* Assuming that DIE corresponds to a function, returns nonzero
17283 if the function is prototyped. */
17286 prototyped_function_p (struct die_info *die, struct dwarf2_cu *cu)
17288 struct attribute *attr;
17290 attr = dwarf2_attr (die, DW_AT_prototyped, cu);
17291 if (attr && (DW_UNSND (attr) != 0))
17294 /* The DWARF standard implies that the DW_AT_prototyped attribute
17295 is only meaninful for C, but the concept also extends to other
17296 languages that allow unprototyped functions (Eg: Objective C).
17297 For all other languages, assume that functions are always
17299 if (cu->language != language_c
17300 && cu->language != language_objc
17301 && cu->language != language_opencl)
17304 /* RealView does not emit DW_AT_prototyped. We can not distinguish
17305 prototyped and unprototyped functions; default to prototyped,
17306 since that is more common in modern code (and RealView warns
17307 about unprototyped functions). */
17308 if (producer_is_realview (cu->producer))
17314 /* Handle DIES due to C code like:
17318 int (*funcp)(int a, long l);
17322 ('funcp' generates a DW_TAG_subroutine_type DIE). */
17324 static struct type *
17325 read_subroutine_type (struct die_info *die, struct dwarf2_cu *cu)
17327 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
17328 struct type *type; /* Type that this function returns. */
17329 struct type *ftype; /* Function that returns above type. */
17330 struct attribute *attr;
17332 type = die_type (die, cu);
17334 /* The die_type call above may have already set the type for this DIE. */
17335 ftype = get_die_type (die, cu);
17339 ftype = lookup_function_type (type);
17341 if (prototyped_function_p (die, cu))
17342 TYPE_PROTOTYPED (ftype) = 1;
17344 /* Store the calling convention in the type if it's available in
17345 the subroutine die. Otherwise set the calling convention to
17346 the default value DW_CC_normal. */
17347 attr = dwarf2_attr (die, DW_AT_calling_convention, cu);
17349 TYPE_CALLING_CONVENTION (ftype) = DW_UNSND (attr);
17350 else if (cu->producer && strstr (cu->producer, "IBM XL C for OpenCL"))
17351 TYPE_CALLING_CONVENTION (ftype) = DW_CC_GDB_IBM_OpenCL;
17353 TYPE_CALLING_CONVENTION (ftype) = DW_CC_normal;
17355 /* Record whether the function returns normally to its caller or not
17356 if the DWARF producer set that information. */
17357 attr = dwarf2_attr (die, DW_AT_noreturn, cu);
17358 if (attr && (DW_UNSND (attr) != 0))
17359 TYPE_NO_RETURN (ftype) = 1;
17361 /* We need to add the subroutine type to the die immediately so
17362 we don't infinitely recurse when dealing with parameters
17363 declared as the same subroutine type. */
17364 set_die_type (die, ftype, cu);
17366 if (die->child != NULL)
17368 struct type *void_type = objfile_type (objfile)->builtin_void;
17369 struct die_info *child_die;
17370 int nparams, iparams;
17372 /* Count the number of parameters.
17373 FIXME: GDB currently ignores vararg functions, but knows about
17374 vararg member functions. */
17376 child_die = die->child;
17377 while (child_die && child_die->tag)
17379 if (child_die->tag == DW_TAG_formal_parameter)
17381 else if (child_die->tag == DW_TAG_unspecified_parameters)
17382 TYPE_VARARGS (ftype) = 1;
17383 child_die = sibling_die (child_die);
17386 /* Allocate storage for parameters and fill them in. */
17387 TYPE_NFIELDS (ftype) = nparams;
17388 TYPE_FIELDS (ftype) = (struct field *)
17389 TYPE_ZALLOC (ftype, nparams * sizeof (struct field));
17391 /* TYPE_FIELD_TYPE must never be NULL. Pre-fill the array to ensure it
17392 even if we error out during the parameters reading below. */
17393 for (iparams = 0; iparams < nparams; iparams++)
17394 TYPE_FIELD_TYPE (ftype, iparams) = void_type;
17397 child_die = die->child;
17398 while (child_die && child_die->tag)
17400 if (child_die->tag == DW_TAG_formal_parameter)
17402 struct type *arg_type;
17404 /* DWARF version 2 has no clean way to discern C++
17405 static and non-static member functions. G++ helps
17406 GDB by marking the first parameter for non-static
17407 member functions (which is the this pointer) as
17408 artificial. We pass this information to
17409 dwarf2_add_member_fn via TYPE_FIELD_ARTIFICIAL.
17411 DWARF version 3 added DW_AT_object_pointer, which GCC
17412 4.5 does not yet generate. */
17413 attr = dwarf2_attr (child_die, DW_AT_artificial, cu);
17415 TYPE_FIELD_ARTIFICIAL (ftype, iparams) = DW_UNSND (attr);
17417 TYPE_FIELD_ARTIFICIAL (ftype, iparams) = 0;
17418 arg_type = die_type (child_die, cu);
17420 /* RealView does not mark THIS as const, which the testsuite
17421 expects. GCC marks THIS as const in method definitions,
17422 but not in the class specifications (GCC PR 43053). */
17423 if (cu->language == language_cplus && !TYPE_CONST (arg_type)
17424 && TYPE_FIELD_ARTIFICIAL (ftype, iparams))
17427 struct dwarf2_cu *arg_cu = cu;
17428 const char *name = dwarf2_name (child_die, cu);
17430 attr = dwarf2_attr (die, DW_AT_object_pointer, cu);
17433 /* If the compiler emits this, use it. */
17434 if (follow_die_ref (die, attr, &arg_cu) == child_die)
17437 else if (name && strcmp (name, "this") == 0)
17438 /* Function definitions will have the argument names. */
17440 else if (name == NULL && iparams == 0)
17441 /* Declarations may not have the names, so like
17442 elsewhere in GDB, assume an artificial first
17443 argument is "this". */
17447 arg_type = make_cv_type (1, TYPE_VOLATILE (arg_type),
17451 TYPE_FIELD_TYPE (ftype, iparams) = arg_type;
17454 child_die = sibling_die (child_die);
17461 static struct type *
17462 read_typedef (struct die_info *die, struct dwarf2_cu *cu)
17464 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
17465 const char *name = NULL;
17466 struct type *this_type, *target_type;
17468 name = dwarf2_full_name (NULL, die, cu);
17469 this_type = init_type (objfile, TYPE_CODE_TYPEDEF, 0, name);
17470 TYPE_TARGET_STUB (this_type) = 1;
17471 set_die_type (die, this_type, cu);
17472 target_type = die_type (die, cu);
17473 if (target_type != this_type)
17474 TYPE_TARGET_TYPE (this_type) = target_type;
17477 /* Self-referential typedefs are, it seems, not allowed by the DWARF
17478 spec and cause infinite loops in GDB. */
17479 complaint (_("Self-referential DW_TAG_typedef "
17480 "- DIE at %s [in module %s]"),
17481 sect_offset_str (die->sect_off), objfile_name (objfile));
17482 TYPE_TARGET_TYPE (this_type) = NULL;
17487 /* Allocate a floating-point type of size BITS and name NAME. Pass NAME_HINT
17488 (which may be different from NAME) to the architecture back-end to allow
17489 it to guess the correct format if necessary. */
17491 static struct type *
17492 dwarf2_init_float_type (struct objfile *objfile, int bits, const char *name,
17493 const char *name_hint)
17495 struct gdbarch *gdbarch = get_objfile_arch (objfile);
17496 const struct floatformat **format;
17499 format = gdbarch_floatformat_for_type (gdbarch, name_hint, bits);
17501 type = init_float_type (objfile, bits, name, format);
17503 type = init_type (objfile, TYPE_CODE_ERROR, bits, name);
17508 /* Allocate an integer type of size BITS and name NAME. */
17510 static struct type *
17511 dwarf2_init_integer_type (struct dwarf2_cu *cu, struct objfile *objfile,
17512 int bits, int unsigned_p, const char *name)
17516 /* Versions of Intel's C Compiler generate an integer type called "void"
17517 instead of using DW_TAG_unspecified_type. This has been seen on
17518 at least versions 14, 17, and 18. */
17519 if (bits == 0 && producer_is_icc (cu) && name != nullptr
17520 && strcmp (name, "void") == 0)
17521 type = objfile_type (objfile)->builtin_void;
17523 type = init_integer_type (objfile, bits, unsigned_p, name);
17528 /* Initialise and return a floating point type of size BITS suitable for
17529 use as a component of a complex number. The NAME_HINT is passed through
17530 when initialising the floating point type and is the name of the complex
17533 As DWARF doesn't currently provide an explicit name for the components
17534 of a complex number, but it can be helpful to have these components
17535 named, we try to select a suitable name based on the size of the
17537 static struct type *
17538 dwarf2_init_complex_target_type (struct dwarf2_cu *cu,
17539 struct objfile *objfile,
17540 int bits, const char *name_hint)
17542 gdbarch *gdbarch = get_objfile_arch (objfile);
17543 struct type *tt = nullptr;
17545 /* Try to find a suitable floating point builtin type of size BITS.
17546 We're going to use the name of this type as the name for the complex
17547 target type that we are about to create. */
17551 tt = builtin_type (gdbarch)->builtin_float;
17554 tt = builtin_type (gdbarch)->builtin_double;
17556 case 96: /* The x86-32 ABI specifies 96-bit long double. */
17558 tt = builtin_type (gdbarch)->builtin_long_double;
17562 /* If the type we found doesn't match the size we were looking for, then
17563 pretend we didn't find a type at all, the complex target type we
17564 create will then be nameless. */
17565 if (tt != nullptr && TYPE_LENGTH (tt) * TARGET_CHAR_BIT != bits)
17568 const char *name = (tt == nullptr) ? nullptr : TYPE_NAME (tt);
17569 return dwarf2_init_float_type (objfile, bits, name, name_hint);
17572 /* Find a representation of a given base type and install
17573 it in the TYPE field of the die. */
17575 static struct type *
17576 read_base_type (struct die_info *die, struct dwarf2_cu *cu)
17578 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
17580 struct attribute *attr;
17581 int encoding = 0, bits = 0;
17584 attr = dwarf2_attr (die, DW_AT_encoding, cu);
17587 encoding = DW_UNSND (attr);
17589 attr = dwarf2_attr (die, DW_AT_byte_size, cu);
17592 bits = DW_UNSND (attr) * TARGET_CHAR_BIT;
17594 name = dwarf2_name (die, cu);
17597 complaint (_("DW_AT_name missing from DW_TAG_base_type"));
17602 case DW_ATE_address:
17603 /* Turn DW_ATE_address into a void * pointer. */
17604 type = init_type (objfile, TYPE_CODE_VOID, TARGET_CHAR_BIT, NULL);
17605 type = init_pointer_type (objfile, bits, name, type);
17607 case DW_ATE_boolean:
17608 type = init_boolean_type (objfile, bits, 1, name);
17610 case DW_ATE_complex_float:
17611 type = dwarf2_init_complex_target_type (cu, objfile, bits / 2, name);
17612 type = init_complex_type (objfile, name, type);
17614 case DW_ATE_decimal_float:
17615 type = init_decfloat_type (objfile, bits, name);
17618 type = dwarf2_init_float_type (objfile, bits, name, name);
17620 case DW_ATE_signed:
17621 type = dwarf2_init_integer_type (cu, objfile, bits, 0, name);
17623 case DW_ATE_unsigned:
17624 if (cu->language == language_fortran
17626 && startswith (name, "character("))
17627 type = init_character_type (objfile, bits, 1, name);
17629 type = dwarf2_init_integer_type (cu, objfile, bits, 1, name);
17631 case DW_ATE_signed_char:
17632 if (cu->language == language_ada || cu->language == language_m2
17633 || cu->language == language_pascal
17634 || cu->language == language_fortran)
17635 type = init_character_type (objfile, bits, 0, name);
17637 type = dwarf2_init_integer_type (cu, objfile, bits, 0, name);
17639 case DW_ATE_unsigned_char:
17640 if (cu->language == language_ada || cu->language == language_m2
17641 || cu->language == language_pascal
17642 || cu->language == language_fortran
17643 || cu->language == language_rust)
17644 type = init_character_type (objfile, bits, 1, name);
17646 type = dwarf2_init_integer_type (cu, objfile, bits, 1, name);
17650 gdbarch *arch = get_objfile_arch (objfile);
17653 type = builtin_type (arch)->builtin_char16;
17654 else if (bits == 32)
17655 type = builtin_type (arch)->builtin_char32;
17658 complaint (_("unsupported DW_ATE_UTF bit size: '%d'"),
17660 type = dwarf2_init_integer_type (cu, objfile, bits, 1, name);
17662 return set_die_type (die, type, cu);
17667 complaint (_("unsupported DW_AT_encoding: '%s'"),
17668 dwarf_type_encoding_name (encoding));
17669 type = init_type (objfile, TYPE_CODE_ERROR, bits, name);
17673 if (name && strcmp (name, "char") == 0)
17674 TYPE_NOSIGN (type) = 1;
17676 maybe_set_alignment (cu, die, type);
17678 return set_die_type (die, type, cu);
17681 /* Parse dwarf attribute if it's a block, reference or constant and put the
17682 resulting value of the attribute into struct bound_prop.
17683 Returns 1 if ATTR could be resolved into PROP, 0 otherwise. */
17686 attr_to_dynamic_prop (const struct attribute *attr, struct die_info *die,
17687 struct dwarf2_cu *cu, struct dynamic_prop *prop)
17689 struct dwarf2_property_baton *baton;
17690 struct obstack *obstack
17691 = &cu->per_cu->dwarf2_per_objfile->objfile->objfile_obstack;
17693 if (attr == NULL || prop == NULL)
17696 if (attr_form_is_block (attr))
17698 baton = XOBNEW (obstack, struct dwarf2_property_baton);
17699 baton->referenced_type = NULL;
17700 baton->locexpr.per_cu = cu->per_cu;
17701 baton->locexpr.size = DW_BLOCK (attr)->size;
17702 baton->locexpr.data = DW_BLOCK (attr)->data;
17703 prop->data.baton = baton;
17704 prop->kind = PROP_LOCEXPR;
17705 gdb_assert (prop->data.baton != NULL);
17707 else if (attr_form_is_ref (attr))
17709 struct dwarf2_cu *target_cu = cu;
17710 struct die_info *target_die;
17711 struct attribute *target_attr;
17713 target_die = follow_die_ref (die, attr, &target_cu);
17714 target_attr = dwarf2_attr (target_die, DW_AT_location, target_cu);
17715 if (target_attr == NULL)
17716 target_attr = dwarf2_attr (target_die, DW_AT_data_member_location,
17718 if (target_attr == NULL)
17721 switch (target_attr->name)
17723 case DW_AT_location:
17724 if (attr_form_is_section_offset (target_attr))
17726 baton = XOBNEW (obstack, struct dwarf2_property_baton);
17727 baton->referenced_type = die_type (target_die, target_cu);
17728 fill_in_loclist_baton (cu, &baton->loclist, target_attr);
17729 prop->data.baton = baton;
17730 prop->kind = PROP_LOCLIST;
17731 gdb_assert (prop->data.baton != NULL);
17733 else if (attr_form_is_block (target_attr))
17735 baton = XOBNEW (obstack, struct dwarf2_property_baton);
17736 baton->referenced_type = die_type (target_die, target_cu);
17737 baton->locexpr.per_cu = cu->per_cu;
17738 baton->locexpr.size = DW_BLOCK (target_attr)->size;
17739 baton->locexpr.data = DW_BLOCK (target_attr)->data;
17740 prop->data.baton = baton;
17741 prop->kind = PROP_LOCEXPR;
17742 gdb_assert (prop->data.baton != NULL);
17746 dwarf2_invalid_attrib_class_complaint ("DW_AT_location",
17747 "dynamic property");
17751 case DW_AT_data_member_location:
17755 if (!handle_data_member_location (target_die, target_cu,
17759 baton = XOBNEW (obstack, struct dwarf2_property_baton);
17760 baton->referenced_type = read_type_die (target_die->parent,
17762 baton->offset_info.offset = offset;
17763 baton->offset_info.type = die_type (target_die, target_cu);
17764 prop->data.baton = baton;
17765 prop->kind = PROP_ADDR_OFFSET;
17770 else if (attr_form_is_constant (attr))
17772 prop->data.const_val = dwarf2_get_attr_constant_value (attr, 0);
17773 prop->kind = PROP_CONST;
17777 dwarf2_invalid_attrib_class_complaint (dwarf_form_name (attr->form),
17778 dwarf2_name (die, cu));
17785 /* Read the given DW_AT_subrange DIE. */
17787 static struct type *
17788 read_subrange_type (struct die_info *die, struct dwarf2_cu *cu)
17790 struct type *base_type, *orig_base_type;
17791 struct type *range_type;
17792 struct attribute *attr;
17793 struct dynamic_prop low, high;
17794 int low_default_is_valid;
17795 int high_bound_is_count = 0;
17797 ULONGEST negative_mask;
17799 orig_base_type = die_type (die, cu);
17800 /* If ORIG_BASE_TYPE is a typedef, it will not be TYPE_UNSIGNED,
17801 whereas the real type might be. So, we use ORIG_BASE_TYPE when
17802 creating the range type, but we use the result of check_typedef
17803 when examining properties of the type. */
17804 base_type = check_typedef (orig_base_type);
17806 /* The die_type call above may have already set the type for this DIE. */
17807 range_type = get_die_type (die, cu);
17811 low.kind = PROP_CONST;
17812 high.kind = PROP_CONST;
17813 high.data.const_val = 0;
17815 /* Set LOW_DEFAULT_IS_VALID if current language and DWARF version allow
17816 omitting DW_AT_lower_bound. */
17817 switch (cu->language)
17820 case language_cplus:
17821 low.data.const_val = 0;
17822 low_default_is_valid = 1;
17824 case language_fortran:
17825 low.data.const_val = 1;
17826 low_default_is_valid = 1;
17829 case language_objc:
17830 case language_rust:
17831 low.data.const_val = 0;
17832 low_default_is_valid = (cu->header.version >= 4);
17836 case language_pascal:
17837 low.data.const_val = 1;
17838 low_default_is_valid = (cu->header.version >= 4);
17841 low.data.const_val = 0;
17842 low_default_is_valid = 0;
17846 attr = dwarf2_attr (die, DW_AT_lower_bound, cu);
17848 attr_to_dynamic_prop (attr, die, cu, &low);
17849 else if (!low_default_is_valid)
17850 complaint (_("Missing DW_AT_lower_bound "
17851 "- DIE at %s [in module %s]"),
17852 sect_offset_str (die->sect_off),
17853 objfile_name (cu->per_cu->dwarf2_per_objfile->objfile));
17855 struct attribute *attr_ub, *attr_count;
17856 attr = attr_ub = dwarf2_attr (die, DW_AT_upper_bound, cu);
17857 if (!attr_to_dynamic_prop (attr, die, cu, &high))
17859 attr = attr_count = dwarf2_attr (die, DW_AT_count, cu);
17860 if (attr_to_dynamic_prop (attr, die, cu, &high))
17862 /* If bounds are constant do the final calculation here. */
17863 if (low.kind == PROP_CONST && high.kind == PROP_CONST)
17864 high.data.const_val = low.data.const_val + high.data.const_val - 1;
17866 high_bound_is_count = 1;
17870 if (attr_ub != NULL)
17871 complaint (_("Unresolved DW_AT_upper_bound "
17872 "- DIE at %s [in module %s]"),
17873 sect_offset_str (die->sect_off),
17874 objfile_name (cu->per_cu->dwarf2_per_objfile->objfile));
17875 if (attr_count != NULL)
17876 complaint (_("Unresolved DW_AT_count "
17877 "- DIE at %s [in module %s]"),
17878 sect_offset_str (die->sect_off),
17879 objfile_name (cu->per_cu->dwarf2_per_objfile->objfile));
17884 /* Dwarf-2 specifications explicitly allows to create subrange types
17885 without specifying a base type.
17886 In that case, the base type must be set to the type of
17887 the lower bound, upper bound or count, in that order, if any of these
17888 three attributes references an object that has a type.
17889 If no base type is found, the Dwarf-2 specifications say that
17890 a signed integer type of size equal to the size of an address should
17892 For the following C code: `extern char gdb_int [];'
17893 GCC produces an empty range DIE.
17894 FIXME: muller/2010-05-28: Possible references to object for low bound,
17895 high bound or count are not yet handled by this code. */
17896 if (TYPE_CODE (base_type) == TYPE_CODE_VOID)
17898 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
17899 struct gdbarch *gdbarch = get_objfile_arch (objfile);
17900 int addr_size = gdbarch_addr_bit (gdbarch) /8;
17901 struct type *int_type = objfile_type (objfile)->builtin_int;
17903 /* Test "int", "long int", and "long long int" objfile types,
17904 and select the first one having a size above or equal to the
17905 architecture address size. */
17906 if (int_type && TYPE_LENGTH (int_type) >= addr_size)
17907 base_type = int_type;
17910 int_type = objfile_type (objfile)->builtin_long;
17911 if (int_type && TYPE_LENGTH (int_type) >= addr_size)
17912 base_type = int_type;
17915 int_type = objfile_type (objfile)->builtin_long_long;
17916 if (int_type && TYPE_LENGTH (int_type) >= addr_size)
17917 base_type = int_type;
17922 /* Normally, the DWARF producers are expected to use a signed
17923 constant form (Eg. DW_FORM_sdata) to express negative bounds.
17924 But this is unfortunately not always the case, as witnessed
17925 with GCC, for instance, where the ambiguous DW_FORM_dataN form
17926 is used instead. To work around that ambiguity, we treat
17927 the bounds as signed, and thus sign-extend their values, when
17928 the base type is signed. */
17930 -((ULONGEST) 1 << (TYPE_LENGTH (base_type) * TARGET_CHAR_BIT - 1));
17931 if (low.kind == PROP_CONST
17932 && !TYPE_UNSIGNED (base_type) && (low.data.const_val & negative_mask))
17933 low.data.const_val |= negative_mask;
17934 if (high.kind == PROP_CONST
17935 && !TYPE_UNSIGNED (base_type) && (high.data.const_val & negative_mask))
17936 high.data.const_val |= negative_mask;
17938 range_type = create_range_type (NULL, orig_base_type, &low, &high);
17940 if (high_bound_is_count)
17941 TYPE_RANGE_DATA (range_type)->flag_upper_bound_is_count = 1;
17943 /* Ada expects an empty array on no boundary attributes. */
17944 if (attr == NULL && cu->language != language_ada)
17945 TYPE_HIGH_BOUND_KIND (range_type) = PROP_UNDEFINED;
17947 name = dwarf2_name (die, cu);
17949 TYPE_NAME (range_type) = name;
17951 attr = dwarf2_attr (die, DW_AT_byte_size, cu);
17953 TYPE_LENGTH (range_type) = DW_UNSND (attr);
17955 maybe_set_alignment (cu, die, range_type);
17957 set_die_type (die, range_type, cu);
17959 /* set_die_type should be already done. */
17960 set_descriptive_type (range_type, die, cu);
17965 static struct type *
17966 read_unspecified_type (struct die_info *die, struct dwarf2_cu *cu)
17970 type = init_type (cu->per_cu->dwarf2_per_objfile->objfile, TYPE_CODE_VOID,0,
17972 TYPE_NAME (type) = dwarf2_name (die, cu);
17974 /* In Ada, an unspecified type is typically used when the description
17975 of the type is defered to a different unit. When encountering
17976 such a type, we treat it as a stub, and try to resolve it later on,
17978 if (cu->language == language_ada)
17979 TYPE_STUB (type) = 1;
17981 return set_die_type (die, type, cu);
17984 /* Read a single die and all its descendents. Set the die's sibling
17985 field to NULL; set other fields in the die correctly, and set all
17986 of the descendents' fields correctly. Set *NEW_INFO_PTR to the
17987 location of the info_ptr after reading all of those dies. PARENT
17988 is the parent of the die in question. */
17990 static struct die_info *
17991 read_die_and_children (const struct die_reader_specs *reader,
17992 const gdb_byte *info_ptr,
17993 const gdb_byte **new_info_ptr,
17994 struct die_info *parent)
17996 struct die_info *die;
17997 const gdb_byte *cur_ptr;
18000 cur_ptr = read_full_die_1 (reader, &die, info_ptr, &has_children, 0);
18003 *new_info_ptr = cur_ptr;
18006 store_in_ref_table (die, reader->cu);
18009 die->child = read_die_and_siblings_1 (reader, cur_ptr, new_info_ptr, die);
18013 *new_info_ptr = cur_ptr;
18016 die->sibling = NULL;
18017 die->parent = parent;
18021 /* Read a die, all of its descendents, and all of its siblings; set
18022 all of the fields of all of the dies correctly. Arguments are as
18023 in read_die_and_children. */
18025 static struct die_info *
18026 read_die_and_siblings_1 (const struct die_reader_specs *reader,
18027 const gdb_byte *info_ptr,
18028 const gdb_byte **new_info_ptr,
18029 struct die_info *parent)
18031 struct die_info *first_die, *last_sibling;
18032 const gdb_byte *cur_ptr;
18034 cur_ptr = info_ptr;
18035 first_die = last_sibling = NULL;
18039 struct die_info *die
18040 = read_die_and_children (reader, cur_ptr, &cur_ptr, parent);
18044 *new_info_ptr = cur_ptr;
18051 last_sibling->sibling = die;
18053 last_sibling = die;
18057 /* Read a die, all of its descendents, and all of its siblings; set
18058 all of the fields of all of the dies correctly. Arguments are as
18059 in read_die_and_children.
18060 This the main entry point for reading a DIE and all its children. */
18062 static struct die_info *
18063 read_die_and_siblings (const struct die_reader_specs *reader,
18064 const gdb_byte *info_ptr,
18065 const gdb_byte **new_info_ptr,
18066 struct die_info *parent)
18068 struct die_info *die = read_die_and_siblings_1 (reader, info_ptr,
18069 new_info_ptr, parent);
18071 if (dwarf_die_debug)
18073 fprintf_unfiltered (gdb_stdlog,
18074 "Read die from %s@0x%x of %s:\n",
18075 get_section_name (reader->die_section),
18076 (unsigned) (info_ptr - reader->die_section->buffer),
18077 bfd_get_filename (reader->abfd));
18078 dump_die (die, dwarf_die_debug);
18084 /* Read a die and all its attributes, leave space for NUM_EXTRA_ATTRS
18086 The caller is responsible for filling in the extra attributes
18087 and updating (*DIEP)->num_attrs.
18088 Set DIEP to point to a newly allocated die with its information,
18089 except for its child, sibling, and parent fields.
18090 Set HAS_CHILDREN to tell whether the die has children or not. */
18092 static const gdb_byte *
18093 read_full_die_1 (const struct die_reader_specs *reader,
18094 struct die_info **diep, const gdb_byte *info_ptr,
18095 int *has_children, int num_extra_attrs)
18097 unsigned int abbrev_number, bytes_read, i;
18098 struct abbrev_info *abbrev;
18099 struct die_info *die;
18100 struct dwarf2_cu *cu = reader->cu;
18101 bfd *abfd = reader->abfd;
18103 sect_offset sect_off = (sect_offset) (info_ptr - reader->buffer);
18104 abbrev_number = read_unsigned_leb128 (abfd, info_ptr, &bytes_read);
18105 info_ptr += bytes_read;
18106 if (!abbrev_number)
18113 abbrev = reader->abbrev_table->lookup_abbrev (abbrev_number);
18115 error (_("Dwarf Error: could not find abbrev number %d [in module %s]"),
18117 bfd_get_filename (abfd));
18119 die = dwarf_alloc_die (cu, abbrev->num_attrs + num_extra_attrs);
18120 die->sect_off = sect_off;
18121 die->tag = abbrev->tag;
18122 die->abbrev = abbrev_number;
18124 /* Make the result usable.
18125 The caller needs to update num_attrs after adding the extra
18127 die->num_attrs = abbrev->num_attrs;
18129 for (i = 0; i < abbrev->num_attrs; ++i)
18130 info_ptr = read_attribute (reader, &die->attrs[i], &abbrev->attrs[i],
18134 *has_children = abbrev->has_children;
18138 /* Read a die and all its attributes.
18139 Set DIEP to point to a newly allocated die with its information,
18140 except for its child, sibling, and parent fields.
18141 Set HAS_CHILDREN to tell whether the die has children or not. */
18143 static const gdb_byte *
18144 read_full_die (const struct die_reader_specs *reader,
18145 struct die_info **diep, const gdb_byte *info_ptr,
18148 const gdb_byte *result;
18150 result = read_full_die_1 (reader, diep, info_ptr, has_children, 0);
18152 if (dwarf_die_debug)
18154 fprintf_unfiltered (gdb_stdlog,
18155 "Read die from %s@0x%x of %s:\n",
18156 get_section_name (reader->die_section),
18157 (unsigned) (info_ptr - reader->die_section->buffer),
18158 bfd_get_filename (reader->abfd));
18159 dump_die (*diep, dwarf_die_debug);
18165 /* Abbreviation tables.
18167 In DWARF version 2, the description of the debugging information is
18168 stored in a separate .debug_abbrev section. Before we read any
18169 dies from a section we read in all abbreviations and install them
18170 in a hash table. */
18172 /* Allocate space for a struct abbrev_info object in ABBREV_TABLE. */
18174 struct abbrev_info *
18175 abbrev_table::alloc_abbrev ()
18177 struct abbrev_info *abbrev;
18179 abbrev = XOBNEW (&abbrev_obstack, struct abbrev_info);
18180 memset (abbrev, 0, sizeof (struct abbrev_info));
18185 /* Add an abbreviation to the table. */
18188 abbrev_table::add_abbrev (unsigned int abbrev_number,
18189 struct abbrev_info *abbrev)
18191 unsigned int hash_number;
18193 hash_number = abbrev_number % ABBREV_HASH_SIZE;
18194 abbrev->next = m_abbrevs[hash_number];
18195 m_abbrevs[hash_number] = abbrev;
18198 /* Look up an abbrev in the table.
18199 Returns NULL if the abbrev is not found. */
18201 struct abbrev_info *
18202 abbrev_table::lookup_abbrev (unsigned int abbrev_number)
18204 unsigned int hash_number;
18205 struct abbrev_info *abbrev;
18207 hash_number = abbrev_number % ABBREV_HASH_SIZE;
18208 abbrev = m_abbrevs[hash_number];
18212 if (abbrev->number == abbrev_number)
18214 abbrev = abbrev->next;
18219 /* Read in an abbrev table. */
18221 static abbrev_table_up
18222 abbrev_table_read_table (struct dwarf2_per_objfile *dwarf2_per_objfile,
18223 struct dwarf2_section_info *section,
18224 sect_offset sect_off)
18226 struct objfile *objfile = dwarf2_per_objfile->objfile;
18227 bfd *abfd = get_section_bfd_owner (section);
18228 const gdb_byte *abbrev_ptr;
18229 struct abbrev_info *cur_abbrev;
18230 unsigned int abbrev_number, bytes_read, abbrev_name;
18231 unsigned int abbrev_form;
18232 struct attr_abbrev *cur_attrs;
18233 unsigned int allocated_attrs;
18235 abbrev_table_up abbrev_table (new struct abbrev_table (sect_off));
18237 dwarf2_read_section (objfile, section);
18238 abbrev_ptr = section->buffer + to_underlying (sect_off);
18239 abbrev_number = read_unsigned_leb128 (abfd, abbrev_ptr, &bytes_read);
18240 abbrev_ptr += bytes_read;
18242 allocated_attrs = ATTR_ALLOC_CHUNK;
18243 cur_attrs = XNEWVEC (struct attr_abbrev, allocated_attrs);
18245 /* Loop until we reach an abbrev number of 0. */
18246 while (abbrev_number)
18248 cur_abbrev = abbrev_table->alloc_abbrev ();
18250 /* read in abbrev header */
18251 cur_abbrev->number = abbrev_number;
18253 = (enum dwarf_tag) read_unsigned_leb128 (abfd, abbrev_ptr, &bytes_read);
18254 abbrev_ptr += bytes_read;
18255 cur_abbrev->has_children = read_1_byte (abfd, abbrev_ptr);
18258 /* now read in declarations */
18261 LONGEST implicit_const;
18263 abbrev_name = read_unsigned_leb128 (abfd, abbrev_ptr, &bytes_read);
18264 abbrev_ptr += bytes_read;
18265 abbrev_form = read_unsigned_leb128 (abfd, abbrev_ptr, &bytes_read);
18266 abbrev_ptr += bytes_read;
18267 if (abbrev_form == DW_FORM_implicit_const)
18269 implicit_const = read_signed_leb128 (abfd, abbrev_ptr,
18271 abbrev_ptr += bytes_read;
18275 /* Initialize it due to a false compiler warning. */
18276 implicit_const = -1;
18279 if (abbrev_name == 0)
18282 if (cur_abbrev->num_attrs == allocated_attrs)
18284 allocated_attrs += ATTR_ALLOC_CHUNK;
18286 = XRESIZEVEC (struct attr_abbrev, cur_attrs, allocated_attrs);
18289 cur_attrs[cur_abbrev->num_attrs].name
18290 = (enum dwarf_attribute) abbrev_name;
18291 cur_attrs[cur_abbrev->num_attrs].form
18292 = (enum dwarf_form) abbrev_form;
18293 cur_attrs[cur_abbrev->num_attrs].implicit_const = implicit_const;
18294 ++cur_abbrev->num_attrs;
18297 cur_abbrev->attrs =
18298 XOBNEWVEC (&abbrev_table->abbrev_obstack, struct attr_abbrev,
18299 cur_abbrev->num_attrs);
18300 memcpy (cur_abbrev->attrs, cur_attrs,
18301 cur_abbrev->num_attrs * sizeof (struct attr_abbrev));
18303 abbrev_table->add_abbrev (abbrev_number, cur_abbrev);
18305 /* Get next abbreviation.
18306 Under Irix6 the abbreviations for a compilation unit are not
18307 always properly terminated with an abbrev number of 0.
18308 Exit loop if we encounter an abbreviation which we have
18309 already read (which means we are about to read the abbreviations
18310 for the next compile unit) or if the end of the abbreviation
18311 table is reached. */
18312 if ((unsigned int) (abbrev_ptr - section->buffer) >= section->size)
18314 abbrev_number = read_unsigned_leb128 (abfd, abbrev_ptr, &bytes_read);
18315 abbrev_ptr += bytes_read;
18316 if (abbrev_table->lookup_abbrev (abbrev_number) != NULL)
18321 return abbrev_table;
18324 /* Returns nonzero if TAG represents a type that we might generate a partial
18328 is_type_tag_for_partial (int tag)
18333 /* Some types that would be reasonable to generate partial symbols for,
18334 that we don't at present. */
18335 case DW_TAG_array_type:
18336 case DW_TAG_file_type:
18337 case DW_TAG_ptr_to_member_type:
18338 case DW_TAG_set_type:
18339 case DW_TAG_string_type:
18340 case DW_TAG_subroutine_type:
18342 case DW_TAG_base_type:
18343 case DW_TAG_class_type:
18344 case DW_TAG_interface_type:
18345 case DW_TAG_enumeration_type:
18346 case DW_TAG_structure_type:
18347 case DW_TAG_subrange_type:
18348 case DW_TAG_typedef:
18349 case DW_TAG_union_type:
18356 /* Load all DIEs that are interesting for partial symbols into memory. */
18358 static struct partial_die_info *
18359 load_partial_dies (const struct die_reader_specs *reader,
18360 const gdb_byte *info_ptr, int building_psymtab)
18362 struct dwarf2_cu *cu = reader->cu;
18363 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
18364 struct partial_die_info *parent_die, *last_die, *first_die = NULL;
18365 unsigned int bytes_read;
18366 unsigned int load_all = 0;
18367 int nesting_level = 1;
18372 gdb_assert (cu->per_cu != NULL);
18373 if (cu->per_cu->load_all_dies)
18377 = htab_create_alloc_ex (cu->header.length / 12,
18381 &cu->comp_unit_obstack,
18382 hashtab_obstack_allocate,
18383 dummy_obstack_deallocate);
18387 abbrev_info *abbrev = peek_die_abbrev (*reader, info_ptr, &bytes_read);
18389 /* A NULL abbrev means the end of a series of children. */
18390 if (abbrev == NULL)
18392 if (--nesting_level == 0)
18395 info_ptr += bytes_read;
18396 last_die = parent_die;
18397 parent_die = parent_die->die_parent;
18401 /* Check for template arguments. We never save these; if
18402 they're seen, we just mark the parent, and go on our way. */
18403 if (parent_die != NULL
18404 && cu->language == language_cplus
18405 && (abbrev->tag == DW_TAG_template_type_param
18406 || abbrev->tag == DW_TAG_template_value_param))
18408 parent_die->has_template_arguments = 1;
18412 /* We don't need a partial DIE for the template argument. */
18413 info_ptr = skip_one_die (reader, info_ptr + bytes_read, abbrev);
18418 /* We only recurse into c++ subprograms looking for template arguments.
18419 Skip their other children. */
18421 && cu->language == language_cplus
18422 && parent_die != NULL
18423 && parent_die->tag == DW_TAG_subprogram)
18425 info_ptr = skip_one_die (reader, info_ptr + bytes_read, abbrev);
18429 /* Check whether this DIE is interesting enough to save. Normally
18430 we would not be interested in members here, but there may be
18431 later variables referencing them via DW_AT_specification (for
18432 static members). */
18434 && !is_type_tag_for_partial (abbrev->tag)
18435 && abbrev->tag != DW_TAG_constant
18436 && abbrev->tag != DW_TAG_enumerator
18437 && abbrev->tag != DW_TAG_subprogram
18438 && abbrev->tag != DW_TAG_inlined_subroutine
18439 && abbrev->tag != DW_TAG_lexical_block
18440 && abbrev->tag != DW_TAG_variable
18441 && abbrev->tag != DW_TAG_namespace
18442 && abbrev->tag != DW_TAG_module
18443 && abbrev->tag != DW_TAG_member
18444 && abbrev->tag != DW_TAG_imported_unit
18445 && abbrev->tag != DW_TAG_imported_declaration)
18447 /* Otherwise we skip to the next sibling, if any. */
18448 info_ptr = skip_one_die (reader, info_ptr + bytes_read, abbrev);
18452 struct partial_die_info pdi ((sect_offset) (info_ptr - reader->buffer),
18455 info_ptr = pdi.read (reader, *abbrev, info_ptr + bytes_read);
18457 /* This two-pass algorithm for processing partial symbols has a
18458 high cost in cache pressure. Thus, handle some simple cases
18459 here which cover the majority of C partial symbols. DIEs
18460 which neither have specification tags in them, nor could have
18461 specification tags elsewhere pointing at them, can simply be
18462 processed and discarded.
18464 This segment is also optional; scan_partial_symbols and
18465 add_partial_symbol will handle these DIEs if we chain
18466 them in normally. When compilers which do not emit large
18467 quantities of duplicate debug information are more common,
18468 this code can probably be removed. */
18470 /* Any complete simple types at the top level (pretty much all
18471 of them, for a language without namespaces), can be processed
18473 if (parent_die == NULL
18474 && pdi.has_specification == 0
18475 && pdi.is_declaration == 0
18476 && ((pdi.tag == DW_TAG_typedef && !pdi.has_children)
18477 || pdi.tag == DW_TAG_base_type
18478 || pdi.tag == DW_TAG_subrange_type))
18480 if (building_psymtab && pdi.name != NULL)
18481 add_psymbol_to_list (pdi.name, strlen (pdi.name), 0,
18482 VAR_DOMAIN, LOC_TYPEDEF, -1,
18483 psymbol_placement::STATIC,
18484 0, cu->language, objfile);
18485 info_ptr = locate_pdi_sibling (reader, &pdi, info_ptr);
18489 /* The exception for DW_TAG_typedef with has_children above is
18490 a workaround of GCC PR debug/47510. In the case of this complaint
18491 type_name_or_error will error on such types later.
18493 GDB skipped children of DW_TAG_typedef by the shortcut above and then
18494 it could not find the child DIEs referenced later, this is checked
18495 above. In correct DWARF DW_TAG_typedef should have no children. */
18497 if (pdi.tag == DW_TAG_typedef && pdi.has_children)
18498 complaint (_("DW_TAG_typedef has childen - GCC PR debug/47510 bug "
18499 "- DIE at %s [in module %s]"),
18500 sect_offset_str (pdi.sect_off), objfile_name (objfile));
18502 /* If we're at the second level, and we're an enumerator, and
18503 our parent has no specification (meaning possibly lives in a
18504 namespace elsewhere), then we can add the partial symbol now
18505 instead of queueing it. */
18506 if (pdi.tag == DW_TAG_enumerator
18507 && parent_die != NULL
18508 && parent_die->die_parent == NULL
18509 && parent_die->tag == DW_TAG_enumeration_type
18510 && parent_die->has_specification == 0)
18512 if (pdi.name == NULL)
18513 complaint (_("malformed enumerator DIE ignored"));
18514 else if (building_psymtab)
18515 add_psymbol_to_list (pdi.name, strlen (pdi.name), 0,
18516 VAR_DOMAIN, LOC_CONST, -1,
18517 cu->language == language_cplus
18518 ? psymbol_placement::GLOBAL
18519 : psymbol_placement::STATIC,
18520 0, cu->language, objfile);
18522 info_ptr = locate_pdi_sibling (reader, &pdi, info_ptr);
18526 struct partial_die_info *part_die
18527 = new (&cu->comp_unit_obstack) partial_die_info (pdi);
18529 /* We'll save this DIE so link it in. */
18530 part_die->die_parent = parent_die;
18531 part_die->die_sibling = NULL;
18532 part_die->die_child = NULL;
18534 if (last_die && last_die == parent_die)
18535 last_die->die_child = part_die;
18537 last_die->die_sibling = part_die;
18539 last_die = part_die;
18541 if (first_die == NULL)
18542 first_die = part_die;
18544 /* Maybe add the DIE to the hash table. Not all DIEs that we
18545 find interesting need to be in the hash table, because we
18546 also have the parent/sibling/child chains; only those that we
18547 might refer to by offset later during partial symbol reading.
18549 For now this means things that might have be the target of a
18550 DW_AT_specification, DW_AT_abstract_origin, or
18551 DW_AT_extension. DW_AT_extension will refer only to
18552 namespaces; DW_AT_abstract_origin refers to functions (and
18553 many things under the function DIE, but we do not recurse
18554 into function DIEs during partial symbol reading) and
18555 possibly variables as well; DW_AT_specification refers to
18556 declarations. Declarations ought to have the DW_AT_declaration
18557 flag. It happens that GCC forgets to put it in sometimes, but
18558 only for functions, not for types.
18560 Adding more things than necessary to the hash table is harmless
18561 except for the performance cost. Adding too few will result in
18562 wasted time in find_partial_die, when we reread the compilation
18563 unit with load_all_dies set. */
18566 || abbrev->tag == DW_TAG_constant
18567 || abbrev->tag == DW_TAG_subprogram
18568 || abbrev->tag == DW_TAG_variable
18569 || abbrev->tag == DW_TAG_namespace
18570 || part_die->is_declaration)
18574 slot = htab_find_slot_with_hash (cu->partial_dies, part_die,
18575 to_underlying (part_die->sect_off),
18580 /* For some DIEs we want to follow their children (if any). For C
18581 we have no reason to follow the children of structures; for other
18582 languages we have to, so that we can get at method physnames
18583 to infer fully qualified class names, for DW_AT_specification,
18584 and for C++ template arguments. For C++, we also look one level
18585 inside functions to find template arguments (if the name of the
18586 function does not already contain the template arguments).
18588 For Ada, we need to scan the children of subprograms and lexical
18589 blocks as well because Ada allows the definition of nested
18590 entities that could be interesting for the debugger, such as
18591 nested subprograms for instance. */
18592 if (last_die->has_children
18594 || last_die->tag == DW_TAG_namespace
18595 || last_die->tag == DW_TAG_module
18596 || last_die->tag == DW_TAG_enumeration_type
18597 || (cu->language == language_cplus
18598 && last_die->tag == DW_TAG_subprogram
18599 && (last_die->name == NULL
18600 || strchr (last_die->name, '<') == NULL))
18601 || (cu->language != language_c
18602 && (last_die->tag == DW_TAG_class_type
18603 || last_die->tag == DW_TAG_interface_type
18604 || last_die->tag == DW_TAG_structure_type
18605 || last_die->tag == DW_TAG_union_type))
18606 || (cu->language == language_ada
18607 && (last_die->tag == DW_TAG_subprogram
18608 || last_die->tag == DW_TAG_lexical_block))))
18611 parent_die = last_die;
18615 /* Otherwise we skip to the next sibling, if any. */
18616 info_ptr = locate_pdi_sibling (reader, last_die, info_ptr);
18618 /* Back to the top, do it again. */
18622 partial_die_info::partial_die_info (sect_offset sect_off_,
18623 struct abbrev_info *abbrev)
18624 : partial_die_info (sect_off_, abbrev->tag, abbrev->has_children)
18628 /* Read a minimal amount of information into the minimal die structure.
18629 INFO_PTR should point just after the initial uleb128 of a DIE. */
18632 partial_die_info::read (const struct die_reader_specs *reader,
18633 const struct abbrev_info &abbrev, const gdb_byte *info_ptr)
18635 struct dwarf2_cu *cu = reader->cu;
18636 struct dwarf2_per_objfile *dwarf2_per_objfile
18637 = cu->per_cu->dwarf2_per_objfile;
18639 int has_low_pc_attr = 0;
18640 int has_high_pc_attr = 0;
18641 int high_pc_relative = 0;
18643 for (i = 0; i < abbrev.num_attrs; ++i)
18645 struct attribute attr;
18647 info_ptr = read_attribute (reader, &attr, &abbrev.attrs[i], info_ptr);
18649 /* Store the data if it is of an attribute we want to keep in a
18650 partial symbol table. */
18656 case DW_TAG_compile_unit:
18657 case DW_TAG_partial_unit:
18658 case DW_TAG_type_unit:
18659 /* Compilation units have a DW_AT_name that is a filename, not
18660 a source language identifier. */
18661 case DW_TAG_enumeration_type:
18662 case DW_TAG_enumerator:
18663 /* These tags always have simple identifiers already; no need
18664 to canonicalize them. */
18665 name = DW_STRING (&attr);
18669 struct objfile *objfile = dwarf2_per_objfile->objfile;
18672 = dwarf2_canonicalize_name (DW_STRING (&attr), cu,
18673 &objfile->per_bfd->storage_obstack);
18678 case DW_AT_linkage_name:
18679 case DW_AT_MIPS_linkage_name:
18680 /* Note that both forms of linkage name might appear. We
18681 assume they will be the same, and we only store the last
18683 if (cu->language == language_ada)
18684 name = DW_STRING (&attr);
18685 linkage_name = DW_STRING (&attr);
18688 has_low_pc_attr = 1;
18689 lowpc = attr_value_as_address (&attr);
18691 case DW_AT_high_pc:
18692 has_high_pc_attr = 1;
18693 highpc = attr_value_as_address (&attr);
18694 if (cu->header.version >= 4 && attr_form_is_constant (&attr))
18695 high_pc_relative = 1;
18697 case DW_AT_location:
18698 /* Support the .debug_loc offsets. */
18699 if (attr_form_is_block (&attr))
18701 d.locdesc = DW_BLOCK (&attr);
18703 else if (attr_form_is_section_offset (&attr))
18705 dwarf2_complex_location_expr_complaint ();
18709 dwarf2_invalid_attrib_class_complaint ("DW_AT_location",
18710 "partial symbol information");
18713 case DW_AT_external:
18714 is_external = DW_UNSND (&attr);
18716 case DW_AT_declaration:
18717 is_declaration = DW_UNSND (&attr);
18722 case DW_AT_abstract_origin:
18723 case DW_AT_specification:
18724 case DW_AT_extension:
18725 has_specification = 1;
18726 spec_offset = dwarf2_get_ref_die_offset (&attr);
18727 spec_is_dwz = (attr.form == DW_FORM_GNU_ref_alt
18728 || cu->per_cu->is_dwz);
18730 case DW_AT_sibling:
18731 /* Ignore absolute siblings, they might point outside of
18732 the current compile unit. */
18733 if (attr.form == DW_FORM_ref_addr)
18734 complaint (_("ignoring absolute DW_AT_sibling"));
18737 const gdb_byte *buffer = reader->buffer;
18738 sect_offset off = dwarf2_get_ref_die_offset (&attr);
18739 const gdb_byte *sibling_ptr = buffer + to_underlying (off);
18741 if (sibling_ptr < info_ptr)
18742 complaint (_("DW_AT_sibling points backwards"));
18743 else if (sibling_ptr > reader->buffer_end)
18744 dwarf2_section_buffer_overflow_complaint (reader->die_section);
18746 sibling = sibling_ptr;
18749 case DW_AT_byte_size:
18752 case DW_AT_const_value:
18753 has_const_value = 1;
18755 case DW_AT_calling_convention:
18756 /* DWARF doesn't provide a way to identify a program's source-level
18757 entry point. DW_AT_calling_convention attributes are only meant
18758 to describe functions' calling conventions.
18760 However, because it's a necessary piece of information in
18761 Fortran, and before DWARF 4 DW_CC_program was the only
18762 piece of debugging information whose definition refers to
18763 a 'main program' at all, several compilers marked Fortran
18764 main programs with DW_CC_program --- even when those
18765 functions use the standard calling conventions.
18767 Although DWARF now specifies a way to provide this
18768 information, we support this practice for backward
18770 if (DW_UNSND (&attr) == DW_CC_program
18771 && cu->language == language_fortran)
18772 main_subprogram = 1;
18775 if (DW_UNSND (&attr) == DW_INL_inlined
18776 || DW_UNSND (&attr) == DW_INL_declared_inlined)
18777 may_be_inlined = 1;
18781 if (tag == DW_TAG_imported_unit)
18783 d.sect_off = dwarf2_get_ref_die_offset (&attr);
18784 is_dwz = (attr.form == DW_FORM_GNU_ref_alt
18785 || cu->per_cu->is_dwz);
18789 case DW_AT_main_subprogram:
18790 main_subprogram = DW_UNSND (&attr);
18795 /* It would be nice to reuse dwarf2_get_pc_bounds here,
18796 but that requires a full DIE, so instead we just
18798 int need_ranges_base = tag != DW_TAG_compile_unit;
18799 unsigned int ranges_offset = (DW_UNSND (&attr)
18800 + (need_ranges_base
18804 /* Value of the DW_AT_ranges attribute is the offset in the
18805 .debug_ranges section. */
18806 if (dwarf2_ranges_read (ranges_offset, &lowpc, &highpc, cu,
18817 if (high_pc_relative)
18820 if (has_low_pc_attr && has_high_pc_attr)
18822 /* When using the GNU linker, .gnu.linkonce. sections are used to
18823 eliminate duplicate copies of functions and vtables and such.
18824 The linker will arbitrarily choose one and discard the others.
18825 The AT_*_pc values for such functions refer to local labels in
18826 these sections. If the section from that file was discarded, the
18827 labels are not in the output, so the relocs get a value of 0.
18828 If this is a discarded function, mark the pc bounds as invalid,
18829 so that GDB will ignore it. */
18830 if (lowpc == 0 && !dwarf2_per_objfile->has_section_at_zero)
18832 struct objfile *objfile = dwarf2_per_objfile->objfile;
18833 struct gdbarch *gdbarch = get_objfile_arch (objfile);
18835 complaint (_("DW_AT_low_pc %s is zero "
18836 "for DIE at %s [in module %s]"),
18837 paddress (gdbarch, lowpc),
18838 sect_offset_str (sect_off),
18839 objfile_name (objfile));
18841 /* dwarf2_get_pc_bounds has also the strict low < high requirement. */
18842 else if (lowpc >= highpc)
18844 struct objfile *objfile = dwarf2_per_objfile->objfile;
18845 struct gdbarch *gdbarch = get_objfile_arch (objfile);
18847 complaint (_("DW_AT_low_pc %s is not < DW_AT_high_pc %s "
18848 "for DIE at %s [in module %s]"),
18849 paddress (gdbarch, lowpc),
18850 paddress (gdbarch, highpc),
18851 sect_offset_str (sect_off),
18852 objfile_name (objfile));
18861 /* Find a cached partial DIE at OFFSET in CU. */
18863 struct partial_die_info *
18864 dwarf2_cu::find_partial_die (sect_offset sect_off)
18866 struct partial_die_info *lookup_die = NULL;
18867 struct partial_die_info part_die (sect_off);
18869 lookup_die = ((struct partial_die_info *)
18870 htab_find_with_hash (partial_dies, &part_die,
18871 to_underlying (sect_off)));
18876 /* Find a partial DIE at OFFSET, which may or may not be in CU,
18877 except in the case of .debug_types DIEs which do not reference
18878 outside their CU (they do however referencing other types via
18879 DW_FORM_ref_sig8). */
18881 static struct partial_die_info *
18882 find_partial_die (sect_offset sect_off, int offset_in_dwz, struct dwarf2_cu *cu)
18884 struct dwarf2_per_objfile *dwarf2_per_objfile
18885 = cu->per_cu->dwarf2_per_objfile;
18886 struct objfile *objfile = dwarf2_per_objfile->objfile;
18887 struct dwarf2_per_cu_data *per_cu = NULL;
18888 struct partial_die_info *pd = NULL;
18890 if (offset_in_dwz == cu->per_cu->is_dwz
18891 && offset_in_cu_p (&cu->header, sect_off))
18893 pd = cu->find_partial_die (sect_off);
18896 /* We missed recording what we needed.
18897 Load all dies and try again. */
18898 per_cu = cu->per_cu;
18902 /* TUs don't reference other CUs/TUs (except via type signatures). */
18903 if (cu->per_cu->is_debug_types)
18905 error (_("Dwarf Error: Type Unit at offset %s contains"
18906 " external reference to offset %s [in module %s].\n"),
18907 sect_offset_str (cu->header.sect_off), sect_offset_str (sect_off),
18908 bfd_get_filename (objfile->obfd));
18910 per_cu = dwarf2_find_containing_comp_unit (sect_off, offset_in_dwz,
18911 dwarf2_per_objfile);
18913 if (per_cu->cu == NULL || per_cu->cu->partial_dies == NULL)
18914 load_partial_comp_unit (per_cu);
18916 per_cu->cu->last_used = 0;
18917 pd = per_cu->cu->find_partial_die (sect_off);
18920 /* If we didn't find it, and not all dies have been loaded,
18921 load them all and try again. */
18923 if (pd == NULL && per_cu->load_all_dies == 0)
18925 per_cu->load_all_dies = 1;
18927 /* This is nasty. When we reread the DIEs, somewhere up the call chain
18928 THIS_CU->cu may already be in use. So we can't just free it and
18929 replace its DIEs with the ones we read in. Instead, we leave those
18930 DIEs alone (which can still be in use, e.g. in scan_partial_symbols),
18931 and clobber THIS_CU->cu->partial_dies with the hash table for the new
18933 load_partial_comp_unit (per_cu);
18935 pd = per_cu->cu->find_partial_die (sect_off);
18939 internal_error (__FILE__, __LINE__,
18940 _("could not find partial DIE %s "
18941 "in cache [from module %s]\n"),
18942 sect_offset_str (sect_off), bfd_get_filename (objfile->obfd));
18946 /* See if we can figure out if the class lives in a namespace. We do
18947 this by looking for a member function; its demangled name will
18948 contain namespace info, if there is any. */
18951 guess_partial_die_structure_name (struct partial_die_info *struct_pdi,
18952 struct dwarf2_cu *cu)
18954 /* NOTE: carlton/2003-10-07: Getting the info this way changes
18955 what template types look like, because the demangler
18956 frequently doesn't give the same name as the debug info. We
18957 could fix this by only using the demangled name to get the
18958 prefix (but see comment in read_structure_type). */
18960 struct partial_die_info *real_pdi;
18961 struct partial_die_info *child_pdi;
18963 /* If this DIE (this DIE's specification, if any) has a parent, then
18964 we should not do this. We'll prepend the parent's fully qualified
18965 name when we create the partial symbol. */
18967 real_pdi = struct_pdi;
18968 while (real_pdi->has_specification)
18969 real_pdi = find_partial_die (real_pdi->spec_offset,
18970 real_pdi->spec_is_dwz, cu);
18972 if (real_pdi->die_parent != NULL)
18975 for (child_pdi = struct_pdi->die_child;
18977 child_pdi = child_pdi->die_sibling)
18979 if (child_pdi->tag == DW_TAG_subprogram
18980 && child_pdi->linkage_name != NULL)
18982 char *actual_class_name
18983 = language_class_name_from_physname (cu->language_defn,
18984 child_pdi->linkage_name);
18985 if (actual_class_name != NULL)
18987 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
18990 obstack_copy0 (&objfile->per_bfd->storage_obstack,
18992 strlen (actual_class_name)));
18993 xfree (actual_class_name);
19001 partial_die_info::fixup (struct dwarf2_cu *cu)
19003 /* Once we've fixed up a die, there's no point in doing so again.
19004 This also avoids a memory leak if we were to call
19005 guess_partial_die_structure_name multiple times. */
19009 /* If we found a reference attribute and the DIE has no name, try
19010 to find a name in the referred to DIE. */
19012 if (name == NULL && has_specification)
19014 struct partial_die_info *spec_die;
19016 spec_die = find_partial_die (spec_offset, spec_is_dwz, cu);
19018 spec_die->fixup (cu);
19020 if (spec_die->name)
19022 name = spec_die->name;
19024 /* Copy DW_AT_external attribute if it is set. */
19025 if (spec_die->is_external)
19026 is_external = spec_die->is_external;
19030 /* Set default names for some unnamed DIEs. */
19032 if (name == NULL && tag == DW_TAG_namespace)
19033 name = CP_ANONYMOUS_NAMESPACE_STR;
19035 /* If there is no parent die to provide a namespace, and there are
19036 children, see if we can determine the namespace from their linkage
19038 if (cu->language == language_cplus
19039 && !VEC_empty (dwarf2_section_info_def,
19040 cu->per_cu->dwarf2_per_objfile->types)
19041 && die_parent == NULL
19043 && (tag == DW_TAG_class_type
19044 || tag == DW_TAG_structure_type
19045 || tag == DW_TAG_union_type))
19046 guess_partial_die_structure_name (this, cu);
19048 /* GCC might emit a nameless struct or union that has a linkage
19049 name. See http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47510. */
19051 && (tag == DW_TAG_class_type
19052 || tag == DW_TAG_interface_type
19053 || tag == DW_TAG_structure_type
19054 || tag == DW_TAG_union_type)
19055 && linkage_name != NULL)
19059 demangled = gdb_demangle (linkage_name, DMGL_TYPES);
19064 /* Strip any leading namespaces/classes, keep only the base name.
19065 DW_AT_name for named DIEs does not contain the prefixes. */
19066 base = strrchr (demangled, ':');
19067 if (base && base > demangled && base[-1] == ':')
19072 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
19075 obstack_copy0 (&objfile->per_bfd->storage_obstack,
19076 base, strlen (base)));
19084 /* Read an attribute value described by an attribute form. */
19086 static const gdb_byte *
19087 read_attribute_value (const struct die_reader_specs *reader,
19088 struct attribute *attr, unsigned form,
19089 LONGEST implicit_const, const gdb_byte *info_ptr)
19091 struct dwarf2_cu *cu = reader->cu;
19092 struct dwarf2_per_objfile *dwarf2_per_objfile
19093 = cu->per_cu->dwarf2_per_objfile;
19094 struct objfile *objfile = dwarf2_per_objfile->objfile;
19095 struct gdbarch *gdbarch = get_objfile_arch (objfile);
19096 bfd *abfd = reader->abfd;
19097 struct comp_unit_head *cu_header = &cu->header;
19098 unsigned int bytes_read;
19099 struct dwarf_block *blk;
19101 attr->form = (enum dwarf_form) form;
19104 case DW_FORM_ref_addr:
19105 if (cu->header.version == 2)
19106 DW_UNSND (attr) = read_address (abfd, info_ptr, cu, &bytes_read);
19108 DW_UNSND (attr) = read_offset (abfd, info_ptr,
19109 &cu->header, &bytes_read);
19110 info_ptr += bytes_read;
19112 case DW_FORM_GNU_ref_alt:
19113 DW_UNSND (attr) = read_offset (abfd, info_ptr, &cu->header, &bytes_read);
19114 info_ptr += bytes_read;
19117 DW_ADDR (attr) = read_address (abfd, info_ptr, cu, &bytes_read);
19118 DW_ADDR (attr) = gdbarch_adjust_dwarf2_addr (gdbarch, DW_ADDR (attr));
19119 info_ptr += bytes_read;
19121 case DW_FORM_block2:
19122 blk = dwarf_alloc_block (cu);
19123 blk->size = read_2_bytes (abfd, info_ptr);
19125 blk->data = read_n_bytes (abfd, info_ptr, blk->size);
19126 info_ptr += blk->size;
19127 DW_BLOCK (attr) = blk;
19129 case DW_FORM_block4:
19130 blk = dwarf_alloc_block (cu);
19131 blk->size = read_4_bytes (abfd, info_ptr);
19133 blk->data = read_n_bytes (abfd, info_ptr, blk->size);
19134 info_ptr += blk->size;
19135 DW_BLOCK (attr) = blk;
19137 case DW_FORM_data2:
19138 DW_UNSND (attr) = read_2_bytes (abfd, info_ptr);
19141 case DW_FORM_data4:
19142 DW_UNSND (attr) = read_4_bytes (abfd, info_ptr);
19145 case DW_FORM_data8:
19146 DW_UNSND (attr) = read_8_bytes (abfd, info_ptr);
19149 case DW_FORM_data16:
19150 blk = dwarf_alloc_block (cu);
19152 blk->data = read_n_bytes (abfd, info_ptr, 16);
19154 DW_BLOCK (attr) = blk;
19156 case DW_FORM_sec_offset:
19157 DW_UNSND (attr) = read_offset (abfd, info_ptr, &cu->header, &bytes_read);
19158 info_ptr += bytes_read;
19160 case DW_FORM_string:
19161 DW_STRING (attr) = read_direct_string (abfd, info_ptr, &bytes_read);
19162 DW_STRING_IS_CANONICAL (attr) = 0;
19163 info_ptr += bytes_read;
19166 if (!cu->per_cu->is_dwz)
19168 DW_STRING (attr) = read_indirect_string (dwarf2_per_objfile,
19169 abfd, info_ptr, cu_header,
19171 DW_STRING_IS_CANONICAL (attr) = 0;
19172 info_ptr += bytes_read;
19176 case DW_FORM_line_strp:
19177 if (!cu->per_cu->is_dwz)
19179 DW_STRING (attr) = read_indirect_line_string (dwarf2_per_objfile,
19181 cu_header, &bytes_read);
19182 DW_STRING_IS_CANONICAL (attr) = 0;
19183 info_ptr += bytes_read;
19187 case DW_FORM_GNU_strp_alt:
19189 struct dwz_file *dwz = dwarf2_get_dwz_file (dwarf2_per_objfile);
19190 LONGEST str_offset = read_offset (abfd, info_ptr, cu_header,
19193 DW_STRING (attr) = read_indirect_string_from_dwz (objfile,
19195 DW_STRING_IS_CANONICAL (attr) = 0;
19196 info_ptr += bytes_read;
19199 case DW_FORM_exprloc:
19200 case DW_FORM_block:
19201 blk = dwarf_alloc_block (cu);
19202 blk->size = read_unsigned_leb128 (abfd, info_ptr, &bytes_read);
19203 info_ptr += bytes_read;
19204 blk->data = read_n_bytes (abfd, info_ptr, blk->size);
19205 info_ptr += blk->size;
19206 DW_BLOCK (attr) = blk;
19208 case DW_FORM_block1:
19209 blk = dwarf_alloc_block (cu);
19210 blk->size = read_1_byte (abfd, info_ptr);
19212 blk->data = read_n_bytes (abfd, info_ptr, blk->size);
19213 info_ptr += blk->size;
19214 DW_BLOCK (attr) = blk;
19216 case DW_FORM_data1:
19217 DW_UNSND (attr) = read_1_byte (abfd, info_ptr);
19221 DW_UNSND (attr) = read_1_byte (abfd, info_ptr);
19224 case DW_FORM_flag_present:
19225 DW_UNSND (attr) = 1;
19227 case DW_FORM_sdata:
19228 DW_SND (attr) = read_signed_leb128 (abfd, info_ptr, &bytes_read);
19229 info_ptr += bytes_read;
19231 case DW_FORM_udata:
19232 DW_UNSND (attr) = read_unsigned_leb128 (abfd, info_ptr, &bytes_read);
19233 info_ptr += bytes_read;
19236 DW_UNSND (attr) = (to_underlying (cu->header.sect_off)
19237 + read_1_byte (abfd, info_ptr));
19241 DW_UNSND (attr) = (to_underlying (cu->header.sect_off)
19242 + read_2_bytes (abfd, info_ptr));
19246 DW_UNSND (attr) = (to_underlying (cu->header.sect_off)
19247 + read_4_bytes (abfd, info_ptr));
19251 DW_UNSND (attr) = (to_underlying (cu->header.sect_off)
19252 + read_8_bytes (abfd, info_ptr));
19255 case DW_FORM_ref_sig8:
19256 DW_SIGNATURE (attr) = read_8_bytes (abfd, info_ptr);
19259 case DW_FORM_ref_udata:
19260 DW_UNSND (attr) = (to_underlying (cu->header.sect_off)
19261 + read_unsigned_leb128 (abfd, info_ptr, &bytes_read));
19262 info_ptr += bytes_read;
19264 case DW_FORM_indirect:
19265 form = read_unsigned_leb128 (abfd, info_ptr, &bytes_read);
19266 info_ptr += bytes_read;
19267 if (form == DW_FORM_implicit_const)
19269 implicit_const = read_signed_leb128 (abfd, info_ptr, &bytes_read);
19270 info_ptr += bytes_read;
19272 info_ptr = read_attribute_value (reader, attr, form, implicit_const,
19275 case DW_FORM_implicit_const:
19276 DW_SND (attr) = implicit_const;
19278 case DW_FORM_addrx:
19279 case DW_FORM_GNU_addr_index:
19280 if (reader->dwo_file == NULL)
19282 /* For now flag a hard error.
19283 Later we can turn this into a complaint. */
19284 error (_("Dwarf Error: %s found in non-DWO CU [in module %s]"),
19285 dwarf_form_name (form),
19286 bfd_get_filename (abfd));
19288 DW_ADDR (attr) = read_addr_index_from_leb128 (cu, info_ptr, &bytes_read);
19289 info_ptr += bytes_read;
19292 case DW_FORM_GNU_str_index:
19293 if (reader->dwo_file == NULL)
19295 /* For now flag a hard error.
19296 Later we can turn this into a complaint if warranted. */
19297 error (_("Dwarf Error: %s found in non-DWO CU [in module %s]"),
19298 dwarf_form_name (form),
19299 bfd_get_filename (abfd));
19302 ULONGEST str_index =
19303 read_unsigned_leb128 (abfd, info_ptr, &bytes_read);
19305 DW_STRING (attr) = read_str_index (reader, str_index);
19306 DW_STRING_IS_CANONICAL (attr) = 0;
19307 info_ptr += bytes_read;
19311 error (_("Dwarf Error: Cannot handle %s in DWARF reader [in module %s]"),
19312 dwarf_form_name (form),
19313 bfd_get_filename (abfd));
19317 if (cu->per_cu->is_dwz && attr_form_is_ref (attr))
19318 attr->form = DW_FORM_GNU_ref_alt;
19320 /* We have seen instances where the compiler tried to emit a byte
19321 size attribute of -1 which ended up being encoded as an unsigned
19322 0xffffffff. Although 0xffffffff is technically a valid size value,
19323 an object of this size seems pretty unlikely so we can relatively
19324 safely treat these cases as if the size attribute was invalid and
19325 treat them as zero by default. */
19326 if (attr->name == DW_AT_byte_size
19327 && form == DW_FORM_data4
19328 && DW_UNSND (attr) >= 0xffffffff)
19331 (_("Suspicious DW_AT_byte_size value treated as zero instead of %s"),
19332 hex_string (DW_UNSND (attr)));
19333 DW_UNSND (attr) = 0;
19339 /* Read an attribute described by an abbreviated attribute. */
19341 static const gdb_byte *
19342 read_attribute (const struct die_reader_specs *reader,
19343 struct attribute *attr, struct attr_abbrev *abbrev,
19344 const gdb_byte *info_ptr)
19346 attr->name = abbrev->name;
19347 return read_attribute_value (reader, attr, abbrev->form,
19348 abbrev->implicit_const, info_ptr);
19351 /* Read dwarf information from a buffer. */
19353 static unsigned int
19354 read_1_byte (bfd *abfd, const gdb_byte *buf)
19356 return bfd_get_8 (abfd, buf);
19360 read_1_signed_byte (bfd *abfd, const gdb_byte *buf)
19362 return bfd_get_signed_8 (abfd, buf);
19365 static unsigned int
19366 read_2_bytes (bfd *abfd, const gdb_byte *buf)
19368 return bfd_get_16 (abfd, buf);
19372 read_2_signed_bytes (bfd *abfd, const gdb_byte *buf)
19374 return bfd_get_signed_16 (abfd, buf);
19377 static unsigned int
19378 read_4_bytes (bfd *abfd, const gdb_byte *buf)
19380 return bfd_get_32 (abfd, buf);
19384 read_4_signed_bytes (bfd *abfd, const gdb_byte *buf)
19386 return bfd_get_signed_32 (abfd, buf);
19390 read_8_bytes (bfd *abfd, const gdb_byte *buf)
19392 return bfd_get_64 (abfd, buf);
19396 read_address (bfd *abfd, const gdb_byte *buf, struct dwarf2_cu *cu,
19397 unsigned int *bytes_read)
19399 struct comp_unit_head *cu_header = &cu->header;
19400 CORE_ADDR retval = 0;
19402 if (cu_header->signed_addr_p)
19404 switch (cu_header->addr_size)
19407 retval = bfd_get_signed_16 (abfd, buf);
19410 retval = bfd_get_signed_32 (abfd, buf);
19413 retval = bfd_get_signed_64 (abfd, buf);
19416 internal_error (__FILE__, __LINE__,
19417 _("read_address: bad switch, signed [in module %s]"),
19418 bfd_get_filename (abfd));
19423 switch (cu_header->addr_size)
19426 retval = bfd_get_16 (abfd, buf);
19429 retval = bfd_get_32 (abfd, buf);
19432 retval = bfd_get_64 (abfd, buf);
19435 internal_error (__FILE__, __LINE__,
19436 _("read_address: bad switch, "
19437 "unsigned [in module %s]"),
19438 bfd_get_filename (abfd));
19442 *bytes_read = cu_header->addr_size;
19446 /* Read the initial length from a section. The (draft) DWARF 3
19447 specification allows the initial length to take up either 4 bytes
19448 or 12 bytes. If the first 4 bytes are 0xffffffff, then the next 8
19449 bytes describe the length and all offsets will be 8 bytes in length
19452 An older, non-standard 64-bit format is also handled by this
19453 function. The older format in question stores the initial length
19454 as an 8-byte quantity without an escape value. Lengths greater
19455 than 2^32 aren't very common which means that the initial 4 bytes
19456 is almost always zero. Since a length value of zero doesn't make
19457 sense for the 32-bit format, this initial zero can be considered to
19458 be an escape value which indicates the presence of the older 64-bit
19459 format. As written, the code can't detect (old format) lengths
19460 greater than 4GB. If it becomes necessary to handle lengths
19461 somewhat larger than 4GB, we could allow other small values (such
19462 as the non-sensical values of 1, 2, and 3) to also be used as
19463 escape values indicating the presence of the old format.
19465 The value returned via bytes_read should be used to increment the
19466 relevant pointer after calling read_initial_length().
19468 [ Note: read_initial_length() and read_offset() are based on the
19469 document entitled "DWARF Debugging Information Format", revision
19470 3, draft 8, dated November 19, 2001. This document was obtained
19473 http://reality.sgiweb.org/davea/dwarf3-draft8-011125.pdf
19475 This document is only a draft and is subject to change. (So beware.)
19477 Details regarding the older, non-standard 64-bit format were
19478 determined empirically by examining 64-bit ELF files produced by
19479 the SGI toolchain on an IRIX 6.5 machine.
19481 - Kevin, July 16, 2002
19485 read_initial_length (bfd *abfd, const gdb_byte *buf, unsigned int *bytes_read)
19487 LONGEST length = bfd_get_32 (abfd, buf);
19489 if (length == 0xffffffff)
19491 length = bfd_get_64 (abfd, buf + 4);
19494 else if (length == 0)
19496 /* Handle the (non-standard) 64-bit DWARF2 format used by IRIX. */
19497 length = bfd_get_64 (abfd, buf);
19508 /* Cover function for read_initial_length.
19509 Returns the length of the object at BUF, and stores the size of the
19510 initial length in *BYTES_READ and stores the size that offsets will be in
19512 If the initial length size is not equivalent to that specified in
19513 CU_HEADER then issue a complaint.
19514 This is useful when reading non-comp-unit headers. */
19517 read_checked_initial_length_and_offset (bfd *abfd, const gdb_byte *buf,
19518 const struct comp_unit_head *cu_header,
19519 unsigned int *bytes_read,
19520 unsigned int *offset_size)
19522 LONGEST length = read_initial_length (abfd, buf, bytes_read);
19524 gdb_assert (cu_header->initial_length_size == 4
19525 || cu_header->initial_length_size == 8
19526 || cu_header->initial_length_size == 12);
19528 if (cu_header->initial_length_size != *bytes_read)
19529 complaint (_("intermixed 32-bit and 64-bit DWARF sections"));
19531 *offset_size = (*bytes_read == 4) ? 4 : 8;
19535 /* Read an offset from the data stream. The size of the offset is
19536 given by cu_header->offset_size. */
19539 read_offset (bfd *abfd, const gdb_byte *buf,
19540 const struct comp_unit_head *cu_header,
19541 unsigned int *bytes_read)
19543 LONGEST offset = read_offset_1 (abfd, buf, cu_header->offset_size);
19545 *bytes_read = cu_header->offset_size;
19549 /* Read an offset from the data stream. */
19552 read_offset_1 (bfd *abfd, const gdb_byte *buf, unsigned int offset_size)
19554 LONGEST retval = 0;
19556 switch (offset_size)
19559 retval = bfd_get_32 (abfd, buf);
19562 retval = bfd_get_64 (abfd, buf);
19565 internal_error (__FILE__, __LINE__,
19566 _("read_offset_1: bad switch [in module %s]"),
19567 bfd_get_filename (abfd));
19573 static const gdb_byte *
19574 read_n_bytes (bfd *abfd, const gdb_byte *buf, unsigned int size)
19576 /* If the size of a host char is 8 bits, we can return a pointer
19577 to the buffer, otherwise we have to copy the data to a buffer
19578 allocated on the temporary obstack. */
19579 gdb_assert (HOST_CHAR_BIT == 8);
19583 static const char *
19584 read_direct_string (bfd *abfd, const gdb_byte *buf,
19585 unsigned int *bytes_read_ptr)
19587 /* If the size of a host char is 8 bits, we can return a pointer
19588 to the string, otherwise we have to copy the string to a buffer
19589 allocated on the temporary obstack. */
19590 gdb_assert (HOST_CHAR_BIT == 8);
19593 *bytes_read_ptr = 1;
19596 *bytes_read_ptr = strlen ((const char *) buf) + 1;
19597 return (const char *) buf;
19600 /* Return pointer to string at section SECT offset STR_OFFSET with error
19601 reporting strings FORM_NAME and SECT_NAME. */
19603 static const char *
19604 read_indirect_string_at_offset_from (struct objfile *objfile,
19605 bfd *abfd, LONGEST str_offset,
19606 struct dwarf2_section_info *sect,
19607 const char *form_name,
19608 const char *sect_name)
19610 dwarf2_read_section (objfile, sect);
19611 if (sect->buffer == NULL)
19612 error (_("%s used without %s section [in module %s]"),
19613 form_name, sect_name, bfd_get_filename (abfd));
19614 if (str_offset >= sect->size)
19615 error (_("%s pointing outside of %s section [in module %s]"),
19616 form_name, sect_name, bfd_get_filename (abfd));
19617 gdb_assert (HOST_CHAR_BIT == 8);
19618 if (sect->buffer[str_offset] == '\0')
19620 return (const char *) (sect->buffer + str_offset);
19623 /* Return pointer to string at .debug_str offset STR_OFFSET. */
19625 static const char *
19626 read_indirect_string_at_offset (struct dwarf2_per_objfile *dwarf2_per_objfile,
19627 bfd *abfd, LONGEST str_offset)
19629 return read_indirect_string_at_offset_from (dwarf2_per_objfile->objfile,
19631 &dwarf2_per_objfile->str,
19632 "DW_FORM_strp", ".debug_str");
19635 /* Return pointer to string at .debug_line_str offset STR_OFFSET. */
19637 static const char *
19638 read_indirect_line_string_at_offset (struct dwarf2_per_objfile *dwarf2_per_objfile,
19639 bfd *abfd, LONGEST str_offset)
19641 return read_indirect_string_at_offset_from (dwarf2_per_objfile->objfile,
19643 &dwarf2_per_objfile->line_str,
19644 "DW_FORM_line_strp",
19645 ".debug_line_str");
19648 /* Read a string at offset STR_OFFSET in the .debug_str section from
19649 the .dwz file DWZ. Throw an error if the offset is too large. If
19650 the string consists of a single NUL byte, return NULL; otherwise
19651 return a pointer to the string. */
19653 static const char *
19654 read_indirect_string_from_dwz (struct objfile *objfile, struct dwz_file *dwz,
19655 LONGEST str_offset)
19657 dwarf2_read_section (objfile, &dwz->str);
19659 if (dwz->str.buffer == NULL)
19660 error (_("DW_FORM_GNU_strp_alt used without .debug_str "
19661 "section [in module %s]"),
19662 bfd_get_filename (dwz->dwz_bfd));
19663 if (str_offset >= dwz->str.size)
19664 error (_("DW_FORM_GNU_strp_alt pointing outside of "
19665 ".debug_str section [in module %s]"),
19666 bfd_get_filename (dwz->dwz_bfd));
19667 gdb_assert (HOST_CHAR_BIT == 8);
19668 if (dwz->str.buffer[str_offset] == '\0')
19670 return (const char *) (dwz->str.buffer + str_offset);
19673 /* Return pointer to string at .debug_str offset as read from BUF.
19674 BUF is assumed to be in a compilation unit described by CU_HEADER.
19675 Return *BYTES_READ_PTR count of bytes read from BUF. */
19677 static const char *
19678 read_indirect_string (struct dwarf2_per_objfile *dwarf2_per_objfile, bfd *abfd,
19679 const gdb_byte *buf,
19680 const struct comp_unit_head *cu_header,
19681 unsigned int *bytes_read_ptr)
19683 LONGEST str_offset = read_offset (abfd, buf, cu_header, bytes_read_ptr);
19685 return read_indirect_string_at_offset (dwarf2_per_objfile, abfd, str_offset);
19688 /* Return pointer to string at .debug_line_str offset as read from BUF.
19689 BUF is assumed to be in a compilation unit described by CU_HEADER.
19690 Return *BYTES_READ_PTR count of bytes read from BUF. */
19692 static const char *
19693 read_indirect_line_string (struct dwarf2_per_objfile *dwarf2_per_objfile,
19694 bfd *abfd, const gdb_byte *buf,
19695 const struct comp_unit_head *cu_header,
19696 unsigned int *bytes_read_ptr)
19698 LONGEST str_offset = read_offset (abfd, buf, cu_header, bytes_read_ptr);
19700 return read_indirect_line_string_at_offset (dwarf2_per_objfile, abfd,
19705 read_unsigned_leb128 (bfd *abfd, const gdb_byte *buf,
19706 unsigned int *bytes_read_ptr)
19709 unsigned int num_read;
19711 unsigned char byte;
19718 byte = bfd_get_8 (abfd, buf);
19721 result |= ((ULONGEST) (byte & 127) << shift);
19722 if ((byte & 128) == 0)
19728 *bytes_read_ptr = num_read;
19733 read_signed_leb128 (bfd *abfd, const gdb_byte *buf,
19734 unsigned int *bytes_read_ptr)
19737 int shift, num_read;
19738 unsigned char byte;
19745 byte = bfd_get_8 (abfd, buf);
19748 result |= ((ULONGEST) (byte & 127) << shift);
19750 if ((byte & 128) == 0)
19755 if ((shift < 8 * sizeof (result)) && (byte & 0x40))
19756 result |= -(((ULONGEST) 1) << shift);
19757 *bytes_read_ptr = num_read;
19761 /* Given index ADDR_INDEX in .debug_addr, fetch the value.
19762 ADDR_BASE is the DW_AT_GNU_addr_base attribute or zero.
19763 ADDR_SIZE is the size of addresses from the CU header. */
19766 read_addr_index_1 (struct dwarf2_per_objfile *dwarf2_per_objfile,
19767 unsigned int addr_index, ULONGEST addr_base, int addr_size)
19769 struct objfile *objfile = dwarf2_per_objfile->objfile;
19770 bfd *abfd = objfile->obfd;
19771 const gdb_byte *info_ptr;
19773 dwarf2_read_section (objfile, &dwarf2_per_objfile->addr);
19774 if (dwarf2_per_objfile->addr.buffer == NULL)
19775 error (_("DW_FORM_addr_index used without .debug_addr section [in module %s]"),
19776 objfile_name (objfile));
19777 if (addr_base + addr_index * addr_size >= dwarf2_per_objfile->addr.size)
19778 error (_("DW_FORM_addr_index pointing outside of "
19779 ".debug_addr section [in module %s]"),
19780 objfile_name (objfile));
19781 info_ptr = (dwarf2_per_objfile->addr.buffer
19782 + addr_base + addr_index * addr_size);
19783 if (addr_size == 4)
19784 return bfd_get_32 (abfd, info_ptr);
19786 return bfd_get_64 (abfd, info_ptr);
19789 /* Given index ADDR_INDEX in .debug_addr, fetch the value. */
19792 read_addr_index (struct dwarf2_cu *cu, unsigned int addr_index)
19794 return read_addr_index_1 (cu->per_cu->dwarf2_per_objfile, addr_index,
19795 cu->addr_base, cu->header.addr_size);
19798 /* Given a pointer to an leb128 value, fetch the value from .debug_addr. */
19801 read_addr_index_from_leb128 (struct dwarf2_cu *cu, const gdb_byte *info_ptr,
19802 unsigned int *bytes_read)
19804 bfd *abfd = cu->per_cu->dwarf2_per_objfile->objfile->obfd;
19805 unsigned int addr_index = read_unsigned_leb128 (abfd, info_ptr, bytes_read);
19807 return read_addr_index (cu, addr_index);
19810 /* Data structure to pass results from dwarf2_read_addr_index_reader
19811 back to dwarf2_read_addr_index. */
19813 struct dwarf2_read_addr_index_data
19815 ULONGEST addr_base;
19819 /* die_reader_func for dwarf2_read_addr_index. */
19822 dwarf2_read_addr_index_reader (const struct die_reader_specs *reader,
19823 const gdb_byte *info_ptr,
19824 struct die_info *comp_unit_die,
19828 struct dwarf2_cu *cu = reader->cu;
19829 struct dwarf2_read_addr_index_data *aidata =
19830 (struct dwarf2_read_addr_index_data *) data;
19832 aidata->addr_base = cu->addr_base;
19833 aidata->addr_size = cu->header.addr_size;
19836 /* Given an index in .debug_addr, fetch the value.
19837 NOTE: This can be called during dwarf expression evaluation,
19838 long after the debug information has been read, and thus per_cu->cu
19839 may no longer exist. */
19842 dwarf2_read_addr_index (struct dwarf2_per_cu_data *per_cu,
19843 unsigned int addr_index)
19845 struct dwarf2_per_objfile *dwarf2_per_objfile = per_cu->dwarf2_per_objfile;
19846 struct dwarf2_cu *cu = per_cu->cu;
19847 ULONGEST addr_base;
19850 /* We need addr_base and addr_size.
19851 If we don't have PER_CU->cu, we have to get it.
19852 Nasty, but the alternative is storing the needed info in PER_CU,
19853 which at this point doesn't seem justified: it's not clear how frequently
19854 it would get used and it would increase the size of every PER_CU.
19855 Entry points like dwarf2_per_cu_addr_size do a similar thing
19856 so we're not in uncharted territory here.
19857 Alas we need to be a bit more complicated as addr_base is contained
19860 We don't need to read the entire CU(/TU).
19861 We just need the header and top level die.
19863 IWBN to use the aging mechanism to let us lazily later discard the CU.
19864 For now we skip this optimization. */
19868 addr_base = cu->addr_base;
19869 addr_size = cu->header.addr_size;
19873 struct dwarf2_read_addr_index_data aidata;
19875 /* Note: We can't use init_cutu_and_read_dies_simple here,
19876 we need addr_base. */
19877 init_cutu_and_read_dies (per_cu, NULL, 0, 0, false,
19878 dwarf2_read_addr_index_reader, &aidata);
19879 addr_base = aidata.addr_base;
19880 addr_size = aidata.addr_size;
19883 return read_addr_index_1 (dwarf2_per_objfile, addr_index, addr_base,
19887 /* Given a DW_FORM_GNU_str_index or DW_FORM_strx, fetch the string.
19888 This is only used by the Fission support. */
19890 static const char *
19891 read_str_index (const struct die_reader_specs *reader, ULONGEST str_index)
19893 struct dwarf2_cu *cu = reader->cu;
19894 struct dwarf2_per_objfile *dwarf2_per_objfile
19895 = cu->per_cu->dwarf2_per_objfile;
19896 struct objfile *objfile = dwarf2_per_objfile->objfile;
19897 const char *objf_name = objfile_name (objfile);
19898 bfd *abfd = objfile->obfd;
19899 struct dwarf2_section_info *str_section = &reader->dwo_file->sections.str;
19900 struct dwarf2_section_info *str_offsets_section =
19901 &reader->dwo_file->sections.str_offsets;
19902 const gdb_byte *info_ptr;
19903 ULONGEST str_offset;
19904 static const char form_name[] = "DW_FORM_GNU_str_index or DW_FORM_strx";
19906 dwarf2_read_section (objfile, str_section);
19907 dwarf2_read_section (objfile, str_offsets_section);
19908 if (str_section->buffer == NULL)
19909 error (_("%s used without .debug_str.dwo section"
19910 " in CU at offset %s [in module %s]"),
19911 form_name, sect_offset_str (cu->header.sect_off), objf_name);
19912 if (str_offsets_section->buffer == NULL)
19913 error (_("%s used without .debug_str_offsets.dwo section"
19914 " in CU at offset %s [in module %s]"),
19915 form_name, sect_offset_str (cu->header.sect_off), objf_name);
19916 if (str_index * cu->header.offset_size >= str_offsets_section->size)
19917 error (_("%s pointing outside of .debug_str_offsets.dwo"
19918 " section in CU at offset %s [in module %s]"),
19919 form_name, sect_offset_str (cu->header.sect_off), objf_name);
19920 info_ptr = (str_offsets_section->buffer
19921 + str_index * cu->header.offset_size);
19922 if (cu->header.offset_size == 4)
19923 str_offset = bfd_get_32 (abfd, info_ptr);
19925 str_offset = bfd_get_64 (abfd, info_ptr);
19926 if (str_offset >= str_section->size)
19927 error (_("Offset from %s pointing outside of"
19928 " .debug_str.dwo section in CU at offset %s [in module %s]"),
19929 form_name, sect_offset_str (cu->header.sect_off), objf_name);
19930 return (const char *) (str_section->buffer + str_offset);
19933 /* Return the length of an LEB128 number in BUF. */
19936 leb128_size (const gdb_byte *buf)
19938 const gdb_byte *begin = buf;
19944 if ((byte & 128) == 0)
19945 return buf - begin;
19950 set_cu_language (unsigned int lang, struct dwarf2_cu *cu)
19959 cu->language = language_c;
19962 case DW_LANG_C_plus_plus:
19963 case DW_LANG_C_plus_plus_11:
19964 case DW_LANG_C_plus_plus_14:
19965 cu->language = language_cplus;
19968 cu->language = language_d;
19970 case DW_LANG_Fortran77:
19971 case DW_LANG_Fortran90:
19972 case DW_LANG_Fortran95:
19973 case DW_LANG_Fortran03:
19974 case DW_LANG_Fortran08:
19975 cu->language = language_fortran;
19978 cu->language = language_go;
19980 case DW_LANG_Mips_Assembler:
19981 cu->language = language_asm;
19983 case DW_LANG_Ada83:
19984 case DW_LANG_Ada95:
19985 cu->language = language_ada;
19987 case DW_LANG_Modula2:
19988 cu->language = language_m2;
19990 case DW_LANG_Pascal83:
19991 cu->language = language_pascal;
19994 cu->language = language_objc;
19997 case DW_LANG_Rust_old:
19998 cu->language = language_rust;
20000 case DW_LANG_Cobol74:
20001 case DW_LANG_Cobol85:
20003 cu->language = language_minimal;
20006 cu->language_defn = language_def (cu->language);
20009 /* Return the named attribute or NULL if not there. */
20011 static struct attribute *
20012 dwarf2_attr (struct die_info *die, unsigned int name, struct dwarf2_cu *cu)
20017 struct attribute *spec = NULL;
20019 for (i = 0; i < die->num_attrs; ++i)
20021 if (die->attrs[i].name == name)
20022 return &die->attrs[i];
20023 if (die->attrs[i].name == DW_AT_specification
20024 || die->attrs[i].name == DW_AT_abstract_origin)
20025 spec = &die->attrs[i];
20031 die = follow_die_ref (die, spec, &cu);
20037 /* Return the named attribute or NULL if not there,
20038 but do not follow DW_AT_specification, etc.
20039 This is for use in contexts where we're reading .debug_types dies.
20040 Following DW_AT_specification, DW_AT_abstract_origin will take us
20041 back up the chain, and we want to go down. */
20043 static struct attribute *
20044 dwarf2_attr_no_follow (struct die_info *die, unsigned int name)
20048 for (i = 0; i < die->num_attrs; ++i)
20049 if (die->attrs[i].name == name)
20050 return &die->attrs[i];
20055 /* Return the string associated with a string-typed attribute, or NULL if it
20056 is either not found or is of an incorrect type. */
20058 static const char *
20059 dwarf2_string_attr (struct die_info *die, unsigned int name, struct dwarf2_cu *cu)
20061 struct attribute *attr;
20062 const char *str = NULL;
20064 attr = dwarf2_attr (die, name, cu);
20068 if (attr->form == DW_FORM_strp || attr->form == DW_FORM_line_strp
20069 || attr->form == DW_FORM_string
20070 || attr->form == DW_FORM_strx
20071 || attr->form == DW_FORM_GNU_str_index
20072 || attr->form == DW_FORM_GNU_strp_alt)
20073 str = DW_STRING (attr);
20075 complaint (_("string type expected for attribute %s for "
20076 "DIE at %s in module %s"),
20077 dwarf_attr_name (name), sect_offset_str (die->sect_off),
20078 objfile_name (cu->per_cu->dwarf2_per_objfile->objfile));
20084 /* Return non-zero iff the attribute NAME is defined for the given DIE,
20085 and holds a non-zero value. This function should only be used for
20086 DW_FORM_flag or DW_FORM_flag_present attributes. */
20089 dwarf2_flag_true_p (struct die_info *die, unsigned name, struct dwarf2_cu *cu)
20091 struct attribute *attr = dwarf2_attr (die, name, cu);
20093 return (attr && DW_UNSND (attr));
20097 die_is_declaration (struct die_info *die, struct dwarf2_cu *cu)
20099 /* A DIE is a declaration if it has a DW_AT_declaration attribute
20100 which value is non-zero. However, we have to be careful with
20101 DIEs having a DW_AT_specification attribute, because dwarf2_attr()
20102 (via dwarf2_flag_true_p) follows this attribute. So we may
20103 end up accidently finding a declaration attribute that belongs
20104 to a different DIE referenced by the specification attribute,
20105 even though the given DIE does not have a declaration attribute. */
20106 return (dwarf2_flag_true_p (die, DW_AT_declaration, cu)
20107 && dwarf2_attr (die, DW_AT_specification, cu) == NULL);
20110 /* Return the die giving the specification for DIE, if there is
20111 one. *SPEC_CU is the CU containing DIE on input, and the CU
20112 containing the return value on output. If there is no
20113 specification, but there is an abstract origin, that is
20116 static struct die_info *
20117 die_specification (struct die_info *die, struct dwarf2_cu **spec_cu)
20119 struct attribute *spec_attr = dwarf2_attr (die, DW_AT_specification,
20122 if (spec_attr == NULL)
20123 spec_attr = dwarf2_attr (die, DW_AT_abstract_origin, *spec_cu);
20125 if (spec_attr == NULL)
20128 return follow_die_ref (die, spec_attr, spec_cu);
20131 /* Stub for free_line_header to match void * callback types. */
20134 free_line_header_voidp (void *arg)
20136 struct line_header *lh = (struct line_header *) arg;
20142 line_header::add_include_dir (const char *include_dir)
20144 if (dwarf_line_debug >= 2)
20145 fprintf_unfiltered (gdb_stdlog, "Adding dir %zu: %s\n",
20146 include_dirs.size () + 1, include_dir);
20148 include_dirs.push_back (include_dir);
20152 line_header::add_file_name (const char *name,
20154 unsigned int mod_time,
20155 unsigned int length)
20157 if (dwarf_line_debug >= 2)
20158 fprintf_unfiltered (gdb_stdlog, "Adding file %u: %s\n",
20159 (unsigned) file_names.size () + 1, name);
20161 file_names.emplace_back (name, d_index, mod_time, length);
20164 /* A convenience function to find the proper .debug_line section for a CU. */
20166 static struct dwarf2_section_info *
20167 get_debug_line_section (struct dwarf2_cu *cu)
20169 struct dwarf2_section_info *section;
20170 struct dwarf2_per_objfile *dwarf2_per_objfile
20171 = cu->per_cu->dwarf2_per_objfile;
20173 /* For TUs in DWO files, the DW_AT_stmt_list attribute lives in the
20175 if (cu->dwo_unit && cu->per_cu->is_debug_types)
20176 section = &cu->dwo_unit->dwo_file->sections.line;
20177 else if (cu->per_cu->is_dwz)
20179 struct dwz_file *dwz = dwarf2_get_dwz_file (dwarf2_per_objfile);
20181 section = &dwz->line;
20184 section = &dwarf2_per_objfile->line;
20189 /* Read directory or file name entry format, starting with byte of
20190 format count entries, ULEB128 pairs of entry formats, ULEB128 of
20191 entries count and the entries themselves in the described entry
20195 read_formatted_entries (struct dwarf2_per_objfile *dwarf2_per_objfile,
20196 bfd *abfd, const gdb_byte **bufp,
20197 struct line_header *lh,
20198 const struct comp_unit_head *cu_header,
20199 void (*callback) (struct line_header *lh,
20202 unsigned int mod_time,
20203 unsigned int length))
20205 gdb_byte format_count, formati;
20206 ULONGEST data_count, datai;
20207 const gdb_byte *buf = *bufp;
20208 const gdb_byte *format_header_data;
20209 unsigned int bytes_read;
20211 format_count = read_1_byte (abfd, buf);
20213 format_header_data = buf;
20214 for (formati = 0; formati < format_count; formati++)
20216 read_unsigned_leb128 (abfd, buf, &bytes_read);
20218 read_unsigned_leb128 (abfd, buf, &bytes_read);
20222 data_count = read_unsigned_leb128 (abfd, buf, &bytes_read);
20224 for (datai = 0; datai < data_count; datai++)
20226 const gdb_byte *format = format_header_data;
20227 struct file_entry fe;
20229 for (formati = 0; formati < format_count; formati++)
20231 ULONGEST content_type = read_unsigned_leb128 (abfd, format, &bytes_read);
20232 format += bytes_read;
20234 ULONGEST form = read_unsigned_leb128 (abfd, format, &bytes_read);
20235 format += bytes_read;
20237 gdb::optional<const char *> string;
20238 gdb::optional<unsigned int> uint;
20242 case DW_FORM_string:
20243 string.emplace (read_direct_string (abfd, buf, &bytes_read));
20247 case DW_FORM_line_strp:
20248 string.emplace (read_indirect_line_string (dwarf2_per_objfile,
20255 case DW_FORM_data1:
20256 uint.emplace (read_1_byte (abfd, buf));
20260 case DW_FORM_data2:
20261 uint.emplace (read_2_bytes (abfd, buf));
20265 case DW_FORM_data4:
20266 uint.emplace (read_4_bytes (abfd, buf));
20270 case DW_FORM_data8:
20271 uint.emplace (read_8_bytes (abfd, buf));
20275 case DW_FORM_udata:
20276 uint.emplace (read_unsigned_leb128 (abfd, buf, &bytes_read));
20280 case DW_FORM_block:
20281 /* It is valid only for DW_LNCT_timestamp which is ignored by
20286 switch (content_type)
20289 if (string.has_value ())
20292 case DW_LNCT_directory_index:
20293 if (uint.has_value ())
20294 fe.d_index = (dir_index) *uint;
20296 case DW_LNCT_timestamp:
20297 if (uint.has_value ())
20298 fe.mod_time = *uint;
20301 if (uint.has_value ())
20307 complaint (_("Unknown format content type %s"),
20308 pulongest (content_type));
20312 callback (lh, fe.name, fe.d_index, fe.mod_time, fe.length);
20318 /* Read the statement program header starting at OFFSET in
20319 .debug_line, or .debug_line.dwo. Return a pointer
20320 to a struct line_header, allocated using xmalloc.
20321 Returns NULL if there is a problem reading the header, e.g., if it
20322 has a version we don't understand.
20324 NOTE: the strings in the include directory and file name tables of
20325 the returned object point into the dwarf line section buffer,
20326 and must not be freed. */
20328 static line_header_up
20329 dwarf_decode_line_header (sect_offset sect_off, struct dwarf2_cu *cu)
20331 const gdb_byte *line_ptr;
20332 unsigned int bytes_read, offset_size;
20334 const char *cur_dir, *cur_file;
20335 struct dwarf2_section_info *section;
20337 struct dwarf2_per_objfile *dwarf2_per_objfile
20338 = cu->per_cu->dwarf2_per_objfile;
20340 section = get_debug_line_section (cu);
20341 dwarf2_read_section (dwarf2_per_objfile->objfile, section);
20342 if (section->buffer == NULL)
20344 if (cu->dwo_unit && cu->per_cu->is_debug_types)
20345 complaint (_("missing .debug_line.dwo section"));
20347 complaint (_("missing .debug_line section"));
20351 /* We can't do this until we know the section is non-empty.
20352 Only then do we know we have such a section. */
20353 abfd = get_section_bfd_owner (section);
20355 /* Make sure that at least there's room for the total_length field.
20356 That could be 12 bytes long, but we're just going to fudge that. */
20357 if (to_underlying (sect_off) + 4 >= section->size)
20359 dwarf2_statement_list_fits_in_line_number_section_complaint ();
20363 line_header_up lh (new line_header ());
20365 lh->sect_off = sect_off;
20366 lh->offset_in_dwz = cu->per_cu->is_dwz;
20368 line_ptr = section->buffer + to_underlying (sect_off);
20370 /* Read in the header. */
20372 read_checked_initial_length_and_offset (abfd, line_ptr, &cu->header,
20373 &bytes_read, &offset_size);
20374 line_ptr += bytes_read;
20375 if (line_ptr + lh->total_length > (section->buffer + section->size))
20377 dwarf2_statement_list_fits_in_line_number_section_complaint ();
20380 lh->statement_program_end = line_ptr + lh->total_length;
20381 lh->version = read_2_bytes (abfd, line_ptr);
20383 if (lh->version > 5)
20385 /* This is a version we don't understand. The format could have
20386 changed in ways we don't handle properly so just punt. */
20387 complaint (_("unsupported version in .debug_line section"));
20390 if (lh->version >= 5)
20392 gdb_byte segment_selector_size;
20394 /* Skip address size. */
20395 read_1_byte (abfd, line_ptr);
20398 segment_selector_size = read_1_byte (abfd, line_ptr);
20400 if (segment_selector_size != 0)
20402 complaint (_("unsupported segment selector size %u "
20403 "in .debug_line section"),
20404 segment_selector_size);
20408 lh->header_length = read_offset_1 (abfd, line_ptr, offset_size);
20409 line_ptr += offset_size;
20410 lh->minimum_instruction_length = read_1_byte (abfd, line_ptr);
20412 if (lh->version >= 4)
20414 lh->maximum_ops_per_instruction = read_1_byte (abfd, line_ptr);
20418 lh->maximum_ops_per_instruction = 1;
20420 if (lh->maximum_ops_per_instruction == 0)
20422 lh->maximum_ops_per_instruction = 1;
20423 complaint (_("invalid maximum_ops_per_instruction "
20424 "in `.debug_line' section"));
20427 lh->default_is_stmt = read_1_byte (abfd, line_ptr);
20429 lh->line_base = read_1_signed_byte (abfd, line_ptr);
20431 lh->line_range = read_1_byte (abfd, line_ptr);
20433 lh->opcode_base = read_1_byte (abfd, line_ptr);
20435 lh->standard_opcode_lengths.reset (new unsigned char[lh->opcode_base]);
20437 lh->standard_opcode_lengths[0] = 1; /* This should never be used anyway. */
20438 for (i = 1; i < lh->opcode_base; ++i)
20440 lh->standard_opcode_lengths[i] = read_1_byte (abfd, line_ptr);
20444 if (lh->version >= 5)
20446 /* Read directory table. */
20447 read_formatted_entries (dwarf2_per_objfile, abfd, &line_ptr, lh.get (),
20449 [] (struct line_header *header, const char *name,
20450 dir_index d_index, unsigned int mod_time,
20451 unsigned int length)
20453 header->add_include_dir (name);
20456 /* Read file name table. */
20457 read_formatted_entries (dwarf2_per_objfile, abfd, &line_ptr, lh.get (),
20459 [] (struct line_header *header, const char *name,
20460 dir_index d_index, unsigned int mod_time,
20461 unsigned int length)
20463 header->add_file_name (name, d_index, mod_time, length);
20468 /* Read directory table. */
20469 while ((cur_dir = read_direct_string (abfd, line_ptr, &bytes_read)) != NULL)
20471 line_ptr += bytes_read;
20472 lh->add_include_dir (cur_dir);
20474 line_ptr += bytes_read;
20476 /* Read file name table. */
20477 while ((cur_file = read_direct_string (abfd, line_ptr, &bytes_read)) != NULL)
20479 unsigned int mod_time, length;
20482 line_ptr += bytes_read;
20483 d_index = (dir_index) read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
20484 line_ptr += bytes_read;
20485 mod_time = read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
20486 line_ptr += bytes_read;
20487 length = read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
20488 line_ptr += bytes_read;
20490 lh->add_file_name (cur_file, d_index, mod_time, length);
20492 line_ptr += bytes_read;
20494 lh->statement_program_start = line_ptr;
20496 if (line_ptr > (section->buffer + section->size))
20497 complaint (_("line number info header doesn't "
20498 "fit in `.debug_line' section"));
20503 /* Subroutine of dwarf_decode_lines to simplify it.
20504 Return the file name of the psymtab for included file FILE_INDEX
20505 in line header LH of PST.
20506 COMP_DIR is the compilation directory (DW_AT_comp_dir) or NULL if unknown.
20507 If space for the result is malloc'd, *NAME_HOLDER will be set.
20508 Returns NULL if FILE_INDEX should be ignored, i.e., it is pst->filename. */
20510 static const char *
20511 psymtab_include_file_name (const struct line_header *lh, int file_index,
20512 const struct partial_symtab *pst,
20513 const char *comp_dir,
20514 gdb::unique_xmalloc_ptr<char> *name_holder)
20516 const file_entry &fe = lh->file_names[file_index];
20517 const char *include_name = fe.name;
20518 const char *include_name_to_compare = include_name;
20519 const char *pst_filename;
20522 const char *dir_name = fe.include_dir (lh);
20524 gdb::unique_xmalloc_ptr<char> hold_compare;
20525 if (!IS_ABSOLUTE_PATH (include_name)
20526 && (dir_name != NULL || comp_dir != NULL))
20528 /* Avoid creating a duplicate psymtab for PST.
20529 We do this by comparing INCLUDE_NAME and PST_FILENAME.
20530 Before we do the comparison, however, we need to account
20531 for DIR_NAME and COMP_DIR.
20532 First prepend dir_name (if non-NULL). If we still don't
20533 have an absolute path prepend comp_dir (if non-NULL).
20534 However, the directory we record in the include-file's
20535 psymtab does not contain COMP_DIR (to match the
20536 corresponding symtab(s)).
20541 bash$ gcc -g ./hello.c
20542 include_name = "hello.c"
20544 DW_AT_comp_dir = comp_dir = "/tmp"
20545 DW_AT_name = "./hello.c"
20549 if (dir_name != NULL)
20551 name_holder->reset (concat (dir_name, SLASH_STRING,
20552 include_name, (char *) NULL));
20553 include_name = name_holder->get ();
20554 include_name_to_compare = include_name;
20556 if (!IS_ABSOLUTE_PATH (include_name) && comp_dir != NULL)
20558 hold_compare.reset (concat (comp_dir, SLASH_STRING,
20559 include_name, (char *) NULL));
20560 include_name_to_compare = hold_compare.get ();
20564 pst_filename = pst->filename;
20565 gdb::unique_xmalloc_ptr<char> copied_name;
20566 if (!IS_ABSOLUTE_PATH (pst_filename) && pst->dirname != NULL)
20568 copied_name.reset (concat (pst->dirname, SLASH_STRING,
20569 pst_filename, (char *) NULL));
20570 pst_filename = copied_name.get ();
20573 file_is_pst = FILENAME_CMP (include_name_to_compare, pst_filename) == 0;
20577 return include_name;
20580 /* State machine to track the state of the line number program. */
20582 class lnp_state_machine
20585 /* Initialize a machine state for the start of a line number
20587 lnp_state_machine (struct dwarf2_cu *cu, gdbarch *arch, line_header *lh,
20588 bool record_lines_p);
20590 file_entry *current_file ()
20592 /* lh->file_names is 0-based, but the file name numbers in the
20593 statement program are 1-based. */
20594 return m_line_header->file_name_at (m_file);
20597 /* Record the line in the state machine. END_SEQUENCE is true if
20598 we're processing the end of a sequence. */
20599 void record_line (bool end_sequence);
20601 /* Check ADDRESS is zero and less than UNRELOCATED_LOWPC and if true
20602 nop-out rest of the lines in this sequence. */
20603 void check_line_address (struct dwarf2_cu *cu,
20604 const gdb_byte *line_ptr,
20605 CORE_ADDR unrelocated_lowpc, CORE_ADDR address);
20607 void handle_set_discriminator (unsigned int discriminator)
20609 m_discriminator = discriminator;
20610 m_line_has_non_zero_discriminator |= discriminator != 0;
20613 /* Handle DW_LNE_set_address. */
20614 void handle_set_address (CORE_ADDR baseaddr, CORE_ADDR address)
20617 address += baseaddr;
20618 m_address = gdbarch_adjust_dwarf2_line (m_gdbarch, address, false);
20621 /* Handle DW_LNS_advance_pc. */
20622 void handle_advance_pc (CORE_ADDR adjust);
20624 /* Handle a special opcode. */
20625 void handle_special_opcode (unsigned char op_code);
20627 /* Handle DW_LNS_advance_line. */
20628 void handle_advance_line (int line_delta)
20630 advance_line (line_delta);
20633 /* Handle DW_LNS_set_file. */
20634 void handle_set_file (file_name_index file);
20636 /* Handle DW_LNS_negate_stmt. */
20637 void handle_negate_stmt ()
20639 m_is_stmt = !m_is_stmt;
20642 /* Handle DW_LNS_const_add_pc. */
20643 void handle_const_add_pc ();
20645 /* Handle DW_LNS_fixed_advance_pc. */
20646 void handle_fixed_advance_pc (CORE_ADDR addr_adj)
20648 m_address += gdbarch_adjust_dwarf2_line (m_gdbarch, addr_adj, true);
20652 /* Handle DW_LNS_copy. */
20653 void handle_copy ()
20655 record_line (false);
20656 m_discriminator = 0;
20659 /* Handle DW_LNE_end_sequence. */
20660 void handle_end_sequence ()
20662 m_currently_recording_lines = true;
20666 /* Advance the line by LINE_DELTA. */
20667 void advance_line (int line_delta)
20669 m_line += line_delta;
20671 if (line_delta != 0)
20672 m_line_has_non_zero_discriminator = m_discriminator != 0;
20675 struct dwarf2_cu *m_cu;
20677 gdbarch *m_gdbarch;
20679 /* True if we're recording lines.
20680 Otherwise we're building partial symtabs and are just interested in
20681 finding include files mentioned by the line number program. */
20682 bool m_record_lines_p;
20684 /* The line number header. */
20685 line_header *m_line_header;
20687 /* These are part of the standard DWARF line number state machine,
20688 and initialized according to the DWARF spec. */
20690 unsigned char m_op_index = 0;
20691 /* The line table index (1-based) of the current file. */
20692 file_name_index m_file = (file_name_index) 1;
20693 unsigned int m_line = 1;
20695 /* These are initialized in the constructor. */
20697 CORE_ADDR m_address;
20699 unsigned int m_discriminator;
20701 /* Additional bits of state we need to track. */
20703 /* The last file that we called dwarf2_start_subfile for.
20704 This is only used for TLLs. */
20705 unsigned int m_last_file = 0;
20706 /* The last file a line number was recorded for. */
20707 struct subfile *m_last_subfile = NULL;
20709 /* When true, record the lines we decode. */
20710 bool m_currently_recording_lines = false;
20712 /* The last line number that was recorded, used to coalesce
20713 consecutive entries for the same line. This can happen, for
20714 example, when discriminators are present. PR 17276. */
20715 unsigned int m_last_line = 0;
20716 bool m_line_has_non_zero_discriminator = false;
20720 lnp_state_machine::handle_advance_pc (CORE_ADDR adjust)
20722 CORE_ADDR addr_adj = (((m_op_index + adjust)
20723 / m_line_header->maximum_ops_per_instruction)
20724 * m_line_header->minimum_instruction_length);
20725 m_address += gdbarch_adjust_dwarf2_line (m_gdbarch, addr_adj, true);
20726 m_op_index = ((m_op_index + adjust)
20727 % m_line_header->maximum_ops_per_instruction);
20731 lnp_state_machine::handle_special_opcode (unsigned char op_code)
20733 unsigned char adj_opcode = op_code - m_line_header->opcode_base;
20734 CORE_ADDR addr_adj = (((m_op_index
20735 + (adj_opcode / m_line_header->line_range))
20736 / m_line_header->maximum_ops_per_instruction)
20737 * m_line_header->minimum_instruction_length);
20738 m_address += gdbarch_adjust_dwarf2_line (m_gdbarch, addr_adj, true);
20739 m_op_index = ((m_op_index + (adj_opcode / m_line_header->line_range))
20740 % m_line_header->maximum_ops_per_instruction);
20742 int line_delta = (m_line_header->line_base
20743 + (adj_opcode % m_line_header->line_range));
20744 advance_line (line_delta);
20745 record_line (false);
20746 m_discriminator = 0;
20750 lnp_state_machine::handle_set_file (file_name_index file)
20754 const file_entry *fe = current_file ();
20756 dwarf2_debug_line_missing_file_complaint ();
20757 else if (m_record_lines_p)
20759 const char *dir = fe->include_dir (m_line_header);
20761 m_last_subfile = m_cu->get_builder ()->get_current_subfile ();
20762 m_line_has_non_zero_discriminator = m_discriminator != 0;
20763 dwarf2_start_subfile (m_cu, fe->name, dir);
20768 lnp_state_machine::handle_const_add_pc ()
20771 = (255 - m_line_header->opcode_base) / m_line_header->line_range;
20774 = (((m_op_index + adjust)
20775 / m_line_header->maximum_ops_per_instruction)
20776 * m_line_header->minimum_instruction_length);
20778 m_address += gdbarch_adjust_dwarf2_line (m_gdbarch, addr_adj, true);
20779 m_op_index = ((m_op_index + adjust)
20780 % m_line_header->maximum_ops_per_instruction);
20783 /* Return non-zero if we should add LINE to the line number table.
20784 LINE is the line to add, LAST_LINE is the last line that was added,
20785 LAST_SUBFILE is the subfile for LAST_LINE.
20786 LINE_HAS_NON_ZERO_DISCRIMINATOR is non-zero if LINE has ever
20787 had a non-zero discriminator.
20789 We have to be careful in the presence of discriminators.
20790 E.g., for this line:
20792 for (i = 0; i < 100000; i++);
20794 clang can emit four line number entries for that one line,
20795 each with a different discriminator.
20796 See gdb.dwarf2/dw2-single-line-discriminators.exp for an example.
20798 However, we want gdb to coalesce all four entries into one.
20799 Otherwise the user could stepi into the middle of the line and
20800 gdb would get confused about whether the pc really was in the
20801 middle of the line.
20803 Things are further complicated by the fact that two consecutive
20804 line number entries for the same line is a heuristic used by gcc
20805 to denote the end of the prologue. So we can't just discard duplicate
20806 entries, we have to be selective about it. The heuristic we use is
20807 that we only collapse consecutive entries for the same line if at least
20808 one of those entries has a non-zero discriminator. PR 17276.
20810 Note: Addresses in the line number state machine can never go backwards
20811 within one sequence, thus this coalescing is ok. */
20814 dwarf_record_line_p (struct dwarf2_cu *cu,
20815 unsigned int line, unsigned int last_line,
20816 int line_has_non_zero_discriminator,
20817 struct subfile *last_subfile)
20819 if (cu->get_builder ()->get_current_subfile () != last_subfile)
20821 if (line != last_line)
20823 /* Same line for the same file that we've seen already.
20824 As a last check, for pr 17276, only record the line if the line
20825 has never had a non-zero discriminator. */
20826 if (!line_has_non_zero_discriminator)
20831 /* Use the CU's builder to record line number LINE beginning at
20832 address ADDRESS in the line table of subfile SUBFILE. */
20835 dwarf_record_line_1 (struct gdbarch *gdbarch, struct subfile *subfile,
20836 unsigned int line, CORE_ADDR address,
20837 struct dwarf2_cu *cu)
20839 CORE_ADDR addr = gdbarch_addr_bits_remove (gdbarch, address);
20841 if (dwarf_line_debug)
20843 fprintf_unfiltered (gdb_stdlog,
20844 "Recording line %u, file %s, address %s\n",
20845 line, lbasename (subfile->name),
20846 paddress (gdbarch, address));
20850 cu->get_builder ()->record_line (subfile, line, addr);
20853 /* Subroutine of dwarf_decode_lines_1 to simplify it.
20854 Mark the end of a set of line number records.
20855 The arguments are the same as for dwarf_record_line_1.
20856 If SUBFILE is NULL the request is ignored. */
20859 dwarf_finish_line (struct gdbarch *gdbarch, struct subfile *subfile,
20860 CORE_ADDR address, struct dwarf2_cu *cu)
20862 if (subfile == NULL)
20865 if (dwarf_line_debug)
20867 fprintf_unfiltered (gdb_stdlog,
20868 "Finishing current line, file %s, address %s\n",
20869 lbasename (subfile->name),
20870 paddress (gdbarch, address));
20873 dwarf_record_line_1 (gdbarch, subfile, 0, address, cu);
20877 lnp_state_machine::record_line (bool end_sequence)
20879 if (dwarf_line_debug)
20881 fprintf_unfiltered (gdb_stdlog,
20882 "Processing actual line %u: file %u,"
20883 " address %s, is_stmt %u, discrim %u\n",
20884 m_line, to_underlying (m_file),
20885 paddress (m_gdbarch, m_address),
20886 m_is_stmt, m_discriminator);
20889 file_entry *fe = current_file ();
20892 dwarf2_debug_line_missing_file_complaint ();
20893 /* For now we ignore lines not starting on an instruction boundary.
20894 But not when processing end_sequence for compatibility with the
20895 previous version of the code. */
20896 else if (m_op_index == 0 || end_sequence)
20898 fe->included_p = 1;
20899 if (m_record_lines_p && (producer_is_codewarrior (m_cu) || m_is_stmt))
20901 if (m_last_subfile != m_cu->get_builder ()->get_current_subfile ()
20904 dwarf_finish_line (m_gdbarch, m_last_subfile, m_address,
20905 m_currently_recording_lines ? m_cu : nullptr);
20910 if (dwarf_record_line_p (m_cu, m_line, m_last_line,
20911 m_line_has_non_zero_discriminator,
20914 buildsym_compunit *builder = m_cu->get_builder ();
20915 dwarf_record_line_1 (m_gdbarch,
20916 builder->get_current_subfile (),
20918 m_currently_recording_lines ? m_cu : nullptr);
20920 m_last_subfile = m_cu->get_builder ()->get_current_subfile ();
20921 m_last_line = m_line;
20927 lnp_state_machine::lnp_state_machine (struct dwarf2_cu *cu, gdbarch *arch,
20928 line_header *lh, bool record_lines_p)
20932 m_record_lines_p = record_lines_p;
20933 m_line_header = lh;
20935 m_currently_recording_lines = true;
20937 /* Call `gdbarch_adjust_dwarf2_line' on the initial 0 address as if there
20938 was a line entry for it so that the backend has a chance to adjust it
20939 and also record it in case it needs it. This is currently used by MIPS
20940 code, cf. `mips_adjust_dwarf2_line'. */
20941 m_address = gdbarch_adjust_dwarf2_line (arch, 0, 0);
20942 m_is_stmt = lh->default_is_stmt;
20943 m_discriminator = 0;
20947 lnp_state_machine::check_line_address (struct dwarf2_cu *cu,
20948 const gdb_byte *line_ptr,
20949 CORE_ADDR unrelocated_lowpc, CORE_ADDR address)
20951 /* If ADDRESS < UNRELOCATED_LOWPC then it's not a usable value, it's outside
20952 the pc range of the CU. However, we restrict the test to only ADDRESS
20953 values of zero to preserve GDB's previous behaviour which is to handle
20954 the specific case of a function being GC'd by the linker. */
20956 if (address == 0 && address < unrelocated_lowpc)
20958 /* This line table is for a function which has been
20959 GCd by the linker. Ignore it. PR gdb/12528 */
20961 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
20962 long line_offset = line_ptr - get_debug_line_section (cu)->buffer;
20964 complaint (_(".debug_line address at offset 0x%lx is 0 [in module %s]"),
20965 line_offset, objfile_name (objfile));
20966 m_currently_recording_lines = false;
20967 /* Note: m_currently_recording_lines is left as false until we see
20968 DW_LNE_end_sequence. */
20972 /* Subroutine of dwarf_decode_lines to simplify it.
20973 Process the line number information in LH.
20974 If DECODE_FOR_PST_P is non-zero, all we do is process the line number
20975 program in order to set included_p for every referenced header. */
20978 dwarf_decode_lines_1 (struct line_header *lh, struct dwarf2_cu *cu,
20979 const int decode_for_pst_p, CORE_ADDR lowpc)
20981 const gdb_byte *line_ptr, *extended_end;
20982 const gdb_byte *line_end;
20983 unsigned int bytes_read, extended_len;
20984 unsigned char op_code, extended_op;
20985 CORE_ADDR baseaddr;
20986 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
20987 bfd *abfd = objfile->obfd;
20988 struct gdbarch *gdbarch = get_objfile_arch (objfile);
20989 /* True if we're recording line info (as opposed to building partial
20990 symtabs and just interested in finding include files mentioned by
20991 the line number program). */
20992 bool record_lines_p = !decode_for_pst_p;
20994 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
20996 line_ptr = lh->statement_program_start;
20997 line_end = lh->statement_program_end;
20999 /* Read the statement sequences until there's nothing left. */
21000 while (line_ptr < line_end)
21002 /* The DWARF line number program state machine. Reset the state
21003 machine at the start of each sequence. */
21004 lnp_state_machine state_machine (cu, gdbarch, lh, record_lines_p);
21005 bool end_sequence = false;
21007 if (record_lines_p)
21009 /* Start a subfile for the current file of the state
21011 const file_entry *fe = state_machine.current_file ();
21014 dwarf2_start_subfile (cu, fe->name, fe->include_dir (lh));
21017 /* Decode the table. */
21018 while (line_ptr < line_end && !end_sequence)
21020 op_code = read_1_byte (abfd, line_ptr);
21023 if (op_code >= lh->opcode_base)
21025 /* Special opcode. */
21026 state_machine.handle_special_opcode (op_code);
21028 else switch (op_code)
21030 case DW_LNS_extended_op:
21031 extended_len = read_unsigned_leb128 (abfd, line_ptr,
21033 line_ptr += bytes_read;
21034 extended_end = line_ptr + extended_len;
21035 extended_op = read_1_byte (abfd, line_ptr);
21037 switch (extended_op)
21039 case DW_LNE_end_sequence:
21040 state_machine.handle_end_sequence ();
21041 end_sequence = true;
21043 case DW_LNE_set_address:
21046 = read_address (abfd, line_ptr, cu, &bytes_read);
21047 line_ptr += bytes_read;
21049 state_machine.check_line_address (cu, line_ptr,
21050 lowpc - baseaddr, address);
21051 state_machine.handle_set_address (baseaddr, address);
21054 case DW_LNE_define_file:
21056 const char *cur_file;
21057 unsigned int mod_time, length;
21060 cur_file = read_direct_string (abfd, line_ptr,
21062 line_ptr += bytes_read;
21063 dindex = (dir_index)
21064 read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
21065 line_ptr += bytes_read;
21067 read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
21068 line_ptr += bytes_read;
21070 read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
21071 line_ptr += bytes_read;
21072 lh->add_file_name (cur_file, dindex, mod_time, length);
21075 case DW_LNE_set_discriminator:
21077 /* The discriminator is not interesting to the
21078 debugger; just ignore it. We still need to
21079 check its value though:
21080 if there are consecutive entries for the same
21081 (non-prologue) line we want to coalesce them.
21084 = read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
21085 line_ptr += bytes_read;
21087 state_machine.handle_set_discriminator (discr);
21091 complaint (_("mangled .debug_line section"));
21094 /* Make sure that we parsed the extended op correctly. If e.g.
21095 we expected a different address size than the producer used,
21096 we may have read the wrong number of bytes. */
21097 if (line_ptr != extended_end)
21099 complaint (_("mangled .debug_line section"));
21104 state_machine.handle_copy ();
21106 case DW_LNS_advance_pc:
21109 = read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
21110 line_ptr += bytes_read;
21112 state_machine.handle_advance_pc (adjust);
21115 case DW_LNS_advance_line:
21118 = read_signed_leb128 (abfd, line_ptr, &bytes_read);
21119 line_ptr += bytes_read;
21121 state_machine.handle_advance_line (line_delta);
21124 case DW_LNS_set_file:
21126 file_name_index file
21127 = (file_name_index) read_unsigned_leb128 (abfd, line_ptr,
21129 line_ptr += bytes_read;
21131 state_machine.handle_set_file (file);
21134 case DW_LNS_set_column:
21135 (void) read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
21136 line_ptr += bytes_read;
21138 case DW_LNS_negate_stmt:
21139 state_machine.handle_negate_stmt ();
21141 case DW_LNS_set_basic_block:
21143 /* Add to the address register of the state machine the
21144 address increment value corresponding to special opcode
21145 255. I.e., this value is scaled by the minimum
21146 instruction length since special opcode 255 would have
21147 scaled the increment. */
21148 case DW_LNS_const_add_pc:
21149 state_machine.handle_const_add_pc ();
21151 case DW_LNS_fixed_advance_pc:
21153 CORE_ADDR addr_adj = read_2_bytes (abfd, line_ptr);
21156 state_machine.handle_fixed_advance_pc (addr_adj);
21161 /* Unknown standard opcode, ignore it. */
21164 for (i = 0; i < lh->standard_opcode_lengths[op_code]; i++)
21166 (void) read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
21167 line_ptr += bytes_read;
21174 dwarf2_debug_line_missing_end_sequence_complaint ();
21176 /* We got a DW_LNE_end_sequence (or we ran off the end of the buffer,
21177 in which case we still finish recording the last line). */
21178 state_machine.record_line (true);
21182 /* Decode the Line Number Program (LNP) for the given line_header
21183 structure and CU. The actual information extracted and the type
21184 of structures created from the LNP depends on the value of PST.
21186 1. If PST is NULL, then this procedure uses the data from the program
21187 to create all necessary symbol tables, and their linetables.
21189 2. If PST is not NULL, this procedure reads the program to determine
21190 the list of files included by the unit represented by PST, and
21191 builds all the associated partial symbol tables.
21193 COMP_DIR is the compilation directory (DW_AT_comp_dir) or NULL if unknown.
21194 It is used for relative paths in the line table.
21195 NOTE: When processing partial symtabs (pst != NULL),
21196 comp_dir == pst->dirname.
21198 NOTE: It is important that psymtabs have the same file name (via strcmp)
21199 as the corresponding symtab. Since COMP_DIR is not used in the name of the
21200 symtab we don't use it in the name of the psymtabs we create.
21201 E.g. expand_line_sal requires this when finding psymtabs to expand.
21202 A good testcase for this is mb-inline.exp.
21204 LOWPC is the lowest address in CU (or 0 if not known).
21206 Boolean DECODE_MAPPING specifies we need to fully decode .debug_line
21207 for its PC<->lines mapping information. Otherwise only the filename
21208 table is read in. */
21211 dwarf_decode_lines (struct line_header *lh, const char *comp_dir,
21212 struct dwarf2_cu *cu, struct partial_symtab *pst,
21213 CORE_ADDR lowpc, int decode_mapping)
21215 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
21216 const int decode_for_pst_p = (pst != NULL);
21218 if (decode_mapping)
21219 dwarf_decode_lines_1 (lh, cu, decode_for_pst_p, lowpc);
21221 if (decode_for_pst_p)
21225 /* Now that we're done scanning the Line Header Program, we can
21226 create the psymtab of each included file. */
21227 for (file_index = 0; file_index < lh->file_names.size (); file_index++)
21228 if (lh->file_names[file_index].included_p == 1)
21230 gdb::unique_xmalloc_ptr<char> name_holder;
21231 const char *include_name =
21232 psymtab_include_file_name (lh, file_index, pst, comp_dir,
21234 if (include_name != NULL)
21235 dwarf2_create_include_psymtab (include_name, pst, objfile);
21240 /* Make sure a symtab is created for every file, even files
21241 which contain only variables (i.e. no code with associated
21243 buildsym_compunit *builder = cu->get_builder ();
21244 struct compunit_symtab *cust = builder->get_compunit_symtab ();
21247 for (i = 0; i < lh->file_names.size (); i++)
21249 file_entry &fe = lh->file_names[i];
21251 dwarf2_start_subfile (cu, fe.name, fe.include_dir (lh));
21253 if (builder->get_current_subfile ()->symtab == NULL)
21255 builder->get_current_subfile ()->symtab
21256 = allocate_symtab (cust,
21257 builder->get_current_subfile ()->name);
21259 fe.symtab = builder->get_current_subfile ()->symtab;
21264 /* Start a subfile for DWARF. FILENAME is the name of the file and
21265 DIRNAME the name of the source directory which contains FILENAME
21266 or NULL if not known.
21267 This routine tries to keep line numbers from identical absolute and
21268 relative file names in a common subfile.
21270 Using the `list' example from the GDB testsuite, which resides in
21271 /srcdir and compiling it with Irix6.2 cc in /compdir using a filename
21272 of /srcdir/list0.c yields the following debugging information for list0.c:
21274 DW_AT_name: /srcdir/list0.c
21275 DW_AT_comp_dir: /compdir
21276 files.files[0].name: list0.h
21277 files.files[0].dir: /srcdir
21278 files.files[1].name: list0.c
21279 files.files[1].dir: /srcdir
21281 The line number information for list0.c has to end up in a single
21282 subfile, so that `break /srcdir/list0.c:1' works as expected.
21283 start_subfile will ensure that this happens provided that we pass the
21284 concatenation of files.files[1].dir and files.files[1].name as the
21288 dwarf2_start_subfile (struct dwarf2_cu *cu, const char *filename,
21289 const char *dirname)
21293 /* In order not to lose the line information directory,
21294 we concatenate it to the filename when it makes sense.
21295 Note that the Dwarf3 standard says (speaking of filenames in line
21296 information): ``The directory index is ignored for file names
21297 that represent full path names''. Thus ignoring dirname in the
21298 `else' branch below isn't an issue. */
21300 if (!IS_ABSOLUTE_PATH (filename) && dirname != NULL)
21302 copy = concat (dirname, SLASH_STRING, filename, (char *)NULL);
21306 cu->get_builder ()->start_subfile (filename);
21312 /* Start a symtab for DWARF. NAME, COMP_DIR, LOW_PC are passed to the
21313 buildsym_compunit constructor. */
21315 struct compunit_symtab *
21316 dwarf2_cu::start_symtab (const char *name, const char *comp_dir,
21319 gdb_assert (m_builder == nullptr);
21321 m_builder.reset (new struct buildsym_compunit
21322 (per_cu->dwarf2_per_objfile->objfile,
21323 name, comp_dir, language, low_pc));
21325 list_in_scope = get_builder ()->get_file_symbols ();
21327 get_builder ()->record_debugformat ("DWARF 2");
21328 get_builder ()->record_producer (producer);
21330 processing_has_namespace_info = false;
21332 return get_builder ()->get_compunit_symtab ();
21336 var_decode_location (struct attribute *attr, struct symbol *sym,
21337 struct dwarf2_cu *cu)
21339 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
21340 struct comp_unit_head *cu_header = &cu->header;
21342 /* NOTE drow/2003-01-30: There used to be a comment and some special
21343 code here to turn a symbol with DW_AT_external and a
21344 SYMBOL_VALUE_ADDRESS of 0 into a LOC_UNRESOLVED symbol. This was
21345 necessary for platforms (maybe Alpha, certainly PowerPC GNU/Linux
21346 with some versions of binutils) where shared libraries could have
21347 relocations against symbols in their debug information - the
21348 minimal symbol would have the right address, but the debug info
21349 would not. It's no longer necessary, because we will explicitly
21350 apply relocations when we read in the debug information now. */
21352 /* A DW_AT_location attribute with no contents indicates that a
21353 variable has been optimized away. */
21354 if (attr_form_is_block (attr) && DW_BLOCK (attr)->size == 0)
21356 SYMBOL_ACLASS_INDEX (sym) = LOC_OPTIMIZED_OUT;
21360 /* Handle one degenerate form of location expression specially, to
21361 preserve GDB's previous behavior when section offsets are
21362 specified. If this is just a DW_OP_addr, DW_OP_addrx, or
21363 DW_OP_GNU_addr_index then mark this symbol as LOC_STATIC. */
21365 if (attr_form_is_block (attr)
21366 && ((DW_BLOCK (attr)->data[0] == DW_OP_addr
21367 && DW_BLOCK (attr)->size == 1 + cu_header->addr_size)
21368 || ((DW_BLOCK (attr)->data[0] == DW_OP_GNU_addr_index
21369 || DW_BLOCK (attr)->data[0] == DW_OP_addrx)
21370 && (DW_BLOCK (attr)->size
21371 == 1 + leb128_size (&DW_BLOCK (attr)->data[1])))))
21373 unsigned int dummy;
21375 if (DW_BLOCK (attr)->data[0] == DW_OP_addr)
21376 SYMBOL_VALUE_ADDRESS (sym) =
21377 read_address (objfile->obfd, DW_BLOCK (attr)->data + 1, cu, &dummy);
21379 SYMBOL_VALUE_ADDRESS (sym) =
21380 read_addr_index_from_leb128 (cu, DW_BLOCK (attr)->data + 1, &dummy);
21381 SYMBOL_ACLASS_INDEX (sym) = LOC_STATIC;
21382 fixup_symbol_section (sym, objfile);
21383 SYMBOL_VALUE_ADDRESS (sym) += ANOFFSET (objfile->section_offsets,
21384 SYMBOL_SECTION (sym));
21388 /* NOTE drow/2002-01-30: It might be worthwhile to have a static
21389 expression evaluator, and use LOC_COMPUTED only when necessary
21390 (i.e. when the value of a register or memory location is
21391 referenced, or a thread-local block, etc.). Then again, it might
21392 not be worthwhile. I'm assuming that it isn't unless performance
21393 or memory numbers show me otherwise. */
21395 dwarf2_symbol_mark_computed (attr, sym, cu, 0);
21397 if (SYMBOL_COMPUTED_OPS (sym)->location_has_loclist)
21398 cu->has_loclist = true;
21401 /* Given a pointer to a DWARF information entry, figure out if we need
21402 to make a symbol table entry for it, and if so, create a new entry
21403 and return a pointer to it.
21404 If TYPE is NULL, determine symbol type from the die, otherwise
21405 used the passed type.
21406 If SPACE is not NULL, use it to hold the new symbol. If it is
21407 NULL, allocate a new symbol on the objfile's obstack. */
21409 static struct symbol *
21410 new_symbol (struct die_info *die, struct type *type, struct dwarf2_cu *cu,
21411 struct symbol *space)
21413 struct dwarf2_per_objfile *dwarf2_per_objfile
21414 = cu->per_cu->dwarf2_per_objfile;
21415 struct objfile *objfile = dwarf2_per_objfile->objfile;
21416 struct gdbarch *gdbarch = get_objfile_arch (objfile);
21417 struct symbol *sym = NULL;
21419 struct attribute *attr = NULL;
21420 struct attribute *attr2 = NULL;
21421 CORE_ADDR baseaddr;
21422 struct pending **list_to_add = NULL;
21424 int inlined_func = (die->tag == DW_TAG_inlined_subroutine);
21426 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
21428 name = dwarf2_name (die, cu);
21431 const char *linkagename;
21432 int suppress_add = 0;
21437 sym = allocate_symbol (objfile);
21438 OBJSTAT (objfile, n_syms++);
21440 /* Cache this symbol's name and the name's demangled form (if any). */
21441 SYMBOL_SET_LANGUAGE (sym, cu->language, &objfile->objfile_obstack);
21442 linkagename = dwarf2_physname (name, die, cu);
21443 SYMBOL_SET_NAMES (sym, linkagename, strlen (linkagename), 0, objfile);
21445 /* Fortran does not have mangling standard and the mangling does differ
21446 between gfortran, iFort etc. */
21447 if (cu->language == language_fortran
21448 && symbol_get_demangled_name (&(sym->ginfo)) == NULL)
21449 symbol_set_demangled_name (&(sym->ginfo),
21450 dwarf2_full_name (name, die, cu),
21453 /* Default assumptions.
21454 Use the passed type or decode it from the die. */
21455 SYMBOL_DOMAIN (sym) = VAR_DOMAIN;
21456 SYMBOL_ACLASS_INDEX (sym) = LOC_OPTIMIZED_OUT;
21458 SYMBOL_TYPE (sym) = type;
21460 SYMBOL_TYPE (sym) = die_type (die, cu);
21461 attr = dwarf2_attr (die,
21462 inlined_func ? DW_AT_call_line : DW_AT_decl_line,
21466 SYMBOL_LINE (sym) = DW_UNSND (attr);
21469 attr = dwarf2_attr (die,
21470 inlined_func ? DW_AT_call_file : DW_AT_decl_file,
21474 file_name_index file_index = (file_name_index) DW_UNSND (attr);
21475 struct file_entry *fe;
21477 if (cu->line_header != NULL)
21478 fe = cu->line_header->file_name_at (file_index);
21483 complaint (_("file index out of range"));
21485 symbol_set_symtab (sym, fe->symtab);
21491 attr = dwarf2_attr (die, DW_AT_low_pc, cu);
21496 addr = attr_value_as_address (attr);
21497 addr = gdbarch_adjust_dwarf2_addr (gdbarch, addr + baseaddr);
21498 SYMBOL_VALUE_ADDRESS (sym) = addr;
21500 SYMBOL_TYPE (sym) = objfile_type (objfile)->builtin_core_addr;
21501 SYMBOL_DOMAIN (sym) = LABEL_DOMAIN;
21502 SYMBOL_ACLASS_INDEX (sym) = LOC_LABEL;
21503 add_symbol_to_list (sym, cu->list_in_scope);
21505 case DW_TAG_subprogram:
21506 /* SYMBOL_BLOCK_VALUE (sym) will be filled in later by
21508 SYMBOL_ACLASS_INDEX (sym) = LOC_BLOCK;
21509 attr2 = dwarf2_attr (die, DW_AT_external, cu);
21510 if ((attr2 && (DW_UNSND (attr2) != 0))
21511 || cu->language == language_ada)
21513 /* Subprograms marked external are stored as a global symbol.
21514 Ada subprograms, whether marked external or not, are always
21515 stored as a global symbol, because we want to be able to
21516 access them globally. For instance, we want to be able
21517 to break on a nested subprogram without having to
21518 specify the context. */
21519 list_to_add = cu->get_builder ()->get_global_symbols ();
21523 list_to_add = cu->list_in_scope;
21526 case DW_TAG_inlined_subroutine:
21527 /* SYMBOL_BLOCK_VALUE (sym) will be filled in later by
21529 SYMBOL_ACLASS_INDEX (sym) = LOC_BLOCK;
21530 SYMBOL_INLINED (sym) = 1;
21531 list_to_add = cu->list_in_scope;
21533 case DW_TAG_template_value_param:
21535 /* Fall through. */
21536 case DW_TAG_constant:
21537 case DW_TAG_variable:
21538 case DW_TAG_member:
21539 /* Compilation with minimal debug info may result in
21540 variables with missing type entries. Change the
21541 misleading `void' type to something sensible. */
21542 if (TYPE_CODE (SYMBOL_TYPE (sym)) == TYPE_CODE_VOID)
21543 SYMBOL_TYPE (sym) = objfile_type (objfile)->builtin_int;
21545 attr = dwarf2_attr (die, DW_AT_const_value, cu);
21546 /* In the case of DW_TAG_member, we should only be called for
21547 static const members. */
21548 if (die->tag == DW_TAG_member)
21550 /* dwarf2_add_field uses die_is_declaration,
21551 so we do the same. */
21552 gdb_assert (die_is_declaration (die, cu));
21557 dwarf2_const_value (attr, sym, cu);
21558 attr2 = dwarf2_attr (die, DW_AT_external, cu);
21561 if (attr2 && (DW_UNSND (attr2) != 0))
21562 list_to_add = cu->get_builder ()->get_global_symbols ();
21564 list_to_add = cu->list_in_scope;
21568 attr = dwarf2_attr (die, DW_AT_location, cu);
21571 var_decode_location (attr, sym, cu);
21572 attr2 = dwarf2_attr (die, DW_AT_external, cu);
21574 /* Fortran explicitly imports any global symbols to the local
21575 scope by DW_TAG_common_block. */
21576 if (cu->language == language_fortran && die->parent
21577 && die->parent->tag == DW_TAG_common_block)
21580 if (SYMBOL_CLASS (sym) == LOC_STATIC
21581 && SYMBOL_VALUE_ADDRESS (sym) == 0
21582 && !dwarf2_per_objfile->has_section_at_zero)
21584 /* When a static variable is eliminated by the linker,
21585 the corresponding debug information is not stripped
21586 out, but the variable address is set to null;
21587 do not add such variables into symbol table. */
21589 else if (attr2 && (DW_UNSND (attr2) != 0))
21591 /* Workaround gfortran PR debug/40040 - it uses
21592 DW_AT_location for variables in -fPIC libraries which may
21593 get overriden by other libraries/executable and get
21594 a different address. Resolve it by the minimal symbol
21595 which may come from inferior's executable using copy
21596 relocation. Make this workaround only for gfortran as for
21597 other compilers GDB cannot guess the minimal symbol
21598 Fortran mangling kind. */
21599 if (cu->language == language_fortran && die->parent
21600 && die->parent->tag == DW_TAG_module
21602 && startswith (cu->producer, "GNU Fortran"))
21603 SYMBOL_ACLASS_INDEX (sym) = LOC_UNRESOLVED;
21605 /* A variable with DW_AT_external is never static,
21606 but it may be block-scoped. */
21608 = ((cu->list_in_scope
21609 == cu->get_builder ()->get_file_symbols ())
21610 ? cu->get_builder ()->get_global_symbols ()
21611 : cu->list_in_scope);
21614 list_to_add = cu->list_in_scope;
21618 /* We do not know the address of this symbol.
21619 If it is an external symbol and we have type information
21620 for it, enter the symbol as a LOC_UNRESOLVED symbol.
21621 The address of the variable will then be determined from
21622 the minimal symbol table whenever the variable is
21624 attr2 = dwarf2_attr (die, DW_AT_external, cu);
21626 /* Fortran explicitly imports any global symbols to the local
21627 scope by DW_TAG_common_block. */
21628 if (cu->language == language_fortran && die->parent
21629 && die->parent->tag == DW_TAG_common_block)
21631 /* SYMBOL_CLASS doesn't matter here because
21632 read_common_block is going to reset it. */
21634 list_to_add = cu->list_in_scope;
21636 else if (attr2 && (DW_UNSND (attr2) != 0)
21637 && dwarf2_attr (die, DW_AT_type, cu) != NULL)
21639 /* A variable with DW_AT_external is never static, but it
21640 may be block-scoped. */
21642 = ((cu->list_in_scope
21643 == cu->get_builder ()->get_file_symbols ())
21644 ? cu->get_builder ()->get_global_symbols ()
21645 : cu->list_in_scope);
21647 SYMBOL_ACLASS_INDEX (sym) = LOC_UNRESOLVED;
21649 else if (!die_is_declaration (die, cu))
21651 /* Use the default LOC_OPTIMIZED_OUT class. */
21652 gdb_assert (SYMBOL_CLASS (sym) == LOC_OPTIMIZED_OUT);
21654 list_to_add = cu->list_in_scope;
21658 case DW_TAG_formal_parameter:
21660 /* If we are inside a function, mark this as an argument. If
21661 not, we might be looking at an argument to an inlined function
21662 when we do not have enough information to show inlined frames;
21663 pretend it's a local variable in that case so that the user can
21665 struct context_stack *curr
21666 = cu->get_builder ()->get_current_context_stack ();
21667 if (curr != nullptr && curr->name != nullptr)
21668 SYMBOL_IS_ARGUMENT (sym) = 1;
21669 attr = dwarf2_attr (die, DW_AT_location, cu);
21672 var_decode_location (attr, sym, cu);
21674 attr = dwarf2_attr (die, DW_AT_const_value, cu);
21677 dwarf2_const_value (attr, sym, cu);
21680 list_to_add = cu->list_in_scope;
21683 case DW_TAG_unspecified_parameters:
21684 /* From varargs functions; gdb doesn't seem to have any
21685 interest in this information, so just ignore it for now.
21688 case DW_TAG_template_type_param:
21690 /* Fall through. */
21691 case DW_TAG_class_type:
21692 case DW_TAG_interface_type:
21693 case DW_TAG_structure_type:
21694 case DW_TAG_union_type:
21695 case DW_TAG_set_type:
21696 case DW_TAG_enumeration_type:
21697 SYMBOL_ACLASS_INDEX (sym) = LOC_TYPEDEF;
21698 SYMBOL_DOMAIN (sym) = STRUCT_DOMAIN;
21701 /* NOTE: carlton/2003-11-10: C++ class symbols shouldn't
21702 really ever be static objects: otherwise, if you try
21703 to, say, break of a class's method and you're in a file
21704 which doesn't mention that class, it won't work unless
21705 the check for all static symbols in lookup_symbol_aux
21706 saves you. See the OtherFileClass tests in
21707 gdb.c++/namespace.exp. */
21711 buildsym_compunit *builder = cu->get_builder ();
21713 = (cu->list_in_scope == builder->get_file_symbols ()
21714 && cu->language == language_cplus
21715 ? builder->get_global_symbols ()
21716 : cu->list_in_scope);
21718 /* The semantics of C++ state that "struct foo {
21719 ... }" also defines a typedef for "foo". */
21720 if (cu->language == language_cplus
21721 || cu->language == language_ada
21722 || cu->language == language_d
21723 || cu->language == language_rust)
21725 /* The symbol's name is already allocated along
21726 with this objfile, so we don't need to
21727 duplicate it for the type. */
21728 if (TYPE_NAME (SYMBOL_TYPE (sym)) == 0)
21729 TYPE_NAME (SYMBOL_TYPE (sym)) = SYMBOL_SEARCH_NAME (sym);
21734 case DW_TAG_typedef:
21735 SYMBOL_ACLASS_INDEX (sym) = LOC_TYPEDEF;
21736 SYMBOL_DOMAIN (sym) = VAR_DOMAIN;
21737 list_to_add = cu->list_in_scope;
21739 case DW_TAG_base_type:
21740 case DW_TAG_subrange_type:
21741 SYMBOL_ACLASS_INDEX (sym) = LOC_TYPEDEF;
21742 SYMBOL_DOMAIN (sym) = VAR_DOMAIN;
21743 list_to_add = cu->list_in_scope;
21745 case DW_TAG_enumerator:
21746 attr = dwarf2_attr (die, DW_AT_const_value, cu);
21749 dwarf2_const_value (attr, sym, cu);
21752 /* NOTE: carlton/2003-11-10: See comment above in the
21753 DW_TAG_class_type, etc. block. */
21756 = (cu->list_in_scope == cu->get_builder ()->get_file_symbols ()
21757 && cu->language == language_cplus
21758 ? cu->get_builder ()->get_global_symbols ()
21759 : cu->list_in_scope);
21762 case DW_TAG_imported_declaration:
21763 case DW_TAG_namespace:
21764 SYMBOL_ACLASS_INDEX (sym) = LOC_TYPEDEF;
21765 list_to_add = cu->get_builder ()->get_global_symbols ();
21767 case DW_TAG_module:
21768 SYMBOL_ACLASS_INDEX (sym) = LOC_TYPEDEF;
21769 SYMBOL_DOMAIN (sym) = MODULE_DOMAIN;
21770 list_to_add = cu->get_builder ()->get_global_symbols ();
21772 case DW_TAG_common_block:
21773 SYMBOL_ACLASS_INDEX (sym) = LOC_COMMON_BLOCK;
21774 SYMBOL_DOMAIN (sym) = COMMON_BLOCK_DOMAIN;
21775 add_symbol_to_list (sym, cu->list_in_scope);
21778 /* Not a tag we recognize. Hopefully we aren't processing
21779 trash data, but since we must specifically ignore things
21780 we don't recognize, there is nothing else we should do at
21782 complaint (_("unsupported tag: '%s'"),
21783 dwarf_tag_name (die->tag));
21789 sym->hash_next = objfile->template_symbols;
21790 objfile->template_symbols = sym;
21791 list_to_add = NULL;
21794 if (list_to_add != NULL)
21795 add_symbol_to_list (sym, list_to_add);
21797 /* For the benefit of old versions of GCC, check for anonymous
21798 namespaces based on the demangled name. */
21799 if (!cu->processing_has_namespace_info
21800 && cu->language == language_cplus)
21801 cp_scan_for_anonymous_namespaces (cu->get_builder (), sym, objfile);
21806 /* Given an attr with a DW_FORM_dataN value in host byte order,
21807 zero-extend it as appropriate for the symbol's type. The DWARF
21808 standard (v4) is not entirely clear about the meaning of using
21809 DW_FORM_dataN for a constant with a signed type, where the type is
21810 wider than the data. The conclusion of a discussion on the DWARF
21811 list was that this is unspecified. We choose to always zero-extend
21812 because that is the interpretation long in use by GCC. */
21815 dwarf2_const_value_data (const struct attribute *attr, struct obstack *obstack,
21816 struct dwarf2_cu *cu, LONGEST *value, int bits)
21818 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
21819 enum bfd_endian byte_order = bfd_big_endian (objfile->obfd) ?
21820 BFD_ENDIAN_BIG : BFD_ENDIAN_LITTLE;
21821 LONGEST l = DW_UNSND (attr);
21823 if (bits < sizeof (*value) * 8)
21825 l &= ((LONGEST) 1 << bits) - 1;
21828 else if (bits == sizeof (*value) * 8)
21832 gdb_byte *bytes = (gdb_byte *) obstack_alloc (obstack, bits / 8);
21833 store_unsigned_integer (bytes, bits / 8, byte_order, l);
21840 /* Read a constant value from an attribute. Either set *VALUE, or if
21841 the value does not fit in *VALUE, set *BYTES - either already
21842 allocated on the objfile obstack, or newly allocated on OBSTACK,
21843 or, set *BATON, if we translated the constant to a location
21847 dwarf2_const_value_attr (const struct attribute *attr, struct type *type,
21848 const char *name, struct obstack *obstack,
21849 struct dwarf2_cu *cu,
21850 LONGEST *value, const gdb_byte **bytes,
21851 struct dwarf2_locexpr_baton **baton)
21853 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
21854 struct comp_unit_head *cu_header = &cu->header;
21855 struct dwarf_block *blk;
21856 enum bfd_endian byte_order = (bfd_big_endian (objfile->obfd) ?
21857 BFD_ENDIAN_BIG : BFD_ENDIAN_LITTLE);
21863 switch (attr->form)
21866 case DW_FORM_addrx:
21867 case DW_FORM_GNU_addr_index:
21871 if (TYPE_LENGTH (type) != cu_header->addr_size)
21872 dwarf2_const_value_length_mismatch_complaint (name,
21873 cu_header->addr_size,
21874 TYPE_LENGTH (type));
21875 /* Symbols of this form are reasonably rare, so we just
21876 piggyback on the existing location code rather than writing
21877 a new implementation of symbol_computed_ops. */
21878 *baton = XOBNEW (obstack, struct dwarf2_locexpr_baton);
21879 (*baton)->per_cu = cu->per_cu;
21880 gdb_assert ((*baton)->per_cu);
21882 (*baton)->size = 2 + cu_header->addr_size;
21883 data = (gdb_byte *) obstack_alloc (obstack, (*baton)->size);
21884 (*baton)->data = data;
21886 data[0] = DW_OP_addr;
21887 store_unsigned_integer (&data[1], cu_header->addr_size,
21888 byte_order, DW_ADDR (attr));
21889 data[cu_header->addr_size + 1] = DW_OP_stack_value;
21892 case DW_FORM_string:
21895 case DW_FORM_GNU_str_index:
21896 case DW_FORM_GNU_strp_alt:
21897 /* DW_STRING is already allocated on the objfile obstack, point
21899 *bytes = (const gdb_byte *) DW_STRING (attr);
21901 case DW_FORM_block1:
21902 case DW_FORM_block2:
21903 case DW_FORM_block4:
21904 case DW_FORM_block:
21905 case DW_FORM_exprloc:
21906 case DW_FORM_data16:
21907 blk = DW_BLOCK (attr);
21908 if (TYPE_LENGTH (type) != blk->size)
21909 dwarf2_const_value_length_mismatch_complaint (name, blk->size,
21910 TYPE_LENGTH (type));
21911 *bytes = blk->data;
21914 /* The DW_AT_const_value attributes are supposed to carry the
21915 symbol's value "represented as it would be on the target
21916 architecture." By the time we get here, it's already been
21917 converted to host endianness, so we just need to sign- or
21918 zero-extend it as appropriate. */
21919 case DW_FORM_data1:
21920 *bytes = dwarf2_const_value_data (attr, obstack, cu, value, 8);
21922 case DW_FORM_data2:
21923 *bytes = dwarf2_const_value_data (attr, obstack, cu, value, 16);
21925 case DW_FORM_data4:
21926 *bytes = dwarf2_const_value_data (attr, obstack, cu, value, 32);
21928 case DW_FORM_data8:
21929 *bytes = dwarf2_const_value_data (attr, obstack, cu, value, 64);
21932 case DW_FORM_sdata:
21933 case DW_FORM_implicit_const:
21934 *value = DW_SND (attr);
21937 case DW_FORM_udata:
21938 *value = DW_UNSND (attr);
21942 complaint (_("unsupported const value attribute form: '%s'"),
21943 dwarf_form_name (attr->form));
21950 /* Copy constant value from an attribute to a symbol. */
21953 dwarf2_const_value (const struct attribute *attr, struct symbol *sym,
21954 struct dwarf2_cu *cu)
21956 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
21958 const gdb_byte *bytes;
21959 struct dwarf2_locexpr_baton *baton;
21961 dwarf2_const_value_attr (attr, SYMBOL_TYPE (sym),
21962 SYMBOL_PRINT_NAME (sym),
21963 &objfile->objfile_obstack, cu,
21964 &value, &bytes, &baton);
21968 SYMBOL_LOCATION_BATON (sym) = baton;
21969 SYMBOL_ACLASS_INDEX (sym) = dwarf2_locexpr_index;
21971 else if (bytes != NULL)
21973 SYMBOL_VALUE_BYTES (sym) = bytes;
21974 SYMBOL_ACLASS_INDEX (sym) = LOC_CONST_BYTES;
21978 SYMBOL_VALUE (sym) = value;
21979 SYMBOL_ACLASS_INDEX (sym) = LOC_CONST;
21983 /* Return the type of the die in question using its DW_AT_type attribute. */
21985 static struct type *
21986 die_type (struct die_info *die, struct dwarf2_cu *cu)
21988 struct attribute *type_attr;
21990 type_attr = dwarf2_attr (die, DW_AT_type, cu);
21993 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
21994 /* A missing DW_AT_type represents a void type. */
21995 return objfile_type (objfile)->builtin_void;
21998 return lookup_die_type (die, type_attr, cu);
22001 /* True iff CU's producer generates GNAT Ada auxiliary information
22002 that allows to find parallel types through that information instead
22003 of having to do expensive parallel lookups by type name. */
22006 need_gnat_info (struct dwarf2_cu *cu)
22008 /* Assume that the Ada compiler was GNAT, which always produces
22009 the auxiliary information. */
22010 return (cu->language == language_ada);
22013 /* Return the auxiliary type of the die in question using its
22014 DW_AT_GNAT_descriptive_type attribute. Returns NULL if the
22015 attribute is not present. */
22017 static struct type *
22018 die_descriptive_type (struct die_info *die, struct dwarf2_cu *cu)
22020 struct attribute *type_attr;
22022 type_attr = dwarf2_attr (die, DW_AT_GNAT_descriptive_type, cu);
22026 return lookup_die_type (die, type_attr, cu);
22029 /* If DIE has a descriptive_type attribute, then set the TYPE's
22030 descriptive type accordingly. */
22033 set_descriptive_type (struct type *type, struct die_info *die,
22034 struct dwarf2_cu *cu)
22036 struct type *descriptive_type = die_descriptive_type (die, cu);
22038 if (descriptive_type)
22040 ALLOCATE_GNAT_AUX_TYPE (type);
22041 TYPE_DESCRIPTIVE_TYPE (type) = descriptive_type;
22045 /* Return the containing type of the die in question using its
22046 DW_AT_containing_type attribute. */
22048 static struct type *
22049 die_containing_type (struct die_info *die, struct dwarf2_cu *cu)
22051 struct attribute *type_attr;
22052 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
22054 type_attr = dwarf2_attr (die, DW_AT_containing_type, cu);
22056 error (_("Dwarf Error: Problem turning containing type into gdb type "
22057 "[in module %s]"), objfile_name (objfile));
22059 return lookup_die_type (die, type_attr, cu);
22062 /* Return an error marker type to use for the ill formed type in DIE/CU. */
22064 static struct type *
22065 build_error_marker_type (struct dwarf2_cu *cu, struct die_info *die)
22067 struct dwarf2_per_objfile *dwarf2_per_objfile
22068 = cu->per_cu->dwarf2_per_objfile;
22069 struct objfile *objfile = dwarf2_per_objfile->objfile;
22072 std::string message
22073 = string_printf (_("<unknown type in %s, CU %s, DIE %s>"),
22074 objfile_name (objfile),
22075 sect_offset_str (cu->header.sect_off),
22076 sect_offset_str (die->sect_off));
22077 saved = (char *) obstack_copy0 (&objfile->objfile_obstack,
22078 message.c_str (), message.length ());
22080 return init_type (objfile, TYPE_CODE_ERROR, 0, saved);
22083 /* Look up the type of DIE in CU using its type attribute ATTR.
22084 ATTR must be one of: DW_AT_type, DW_AT_GNAT_descriptive_type,
22085 DW_AT_containing_type.
22086 If there is no type substitute an error marker. */
22088 static struct type *
22089 lookup_die_type (struct die_info *die, const struct attribute *attr,
22090 struct dwarf2_cu *cu)
22092 struct dwarf2_per_objfile *dwarf2_per_objfile
22093 = cu->per_cu->dwarf2_per_objfile;
22094 struct objfile *objfile = dwarf2_per_objfile->objfile;
22095 struct type *this_type;
22097 gdb_assert (attr->name == DW_AT_type
22098 || attr->name == DW_AT_GNAT_descriptive_type
22099 || attr->name == DW_AT_containing_type);
22101 /* First see if we have it cached. */
22103 if (attr->form == DW_FORM_GNU_ref_alt)
22105 struct dwarf2_per_cu_data *per_cu;
22106 sect_offset sect_off = dwarf2_get_ref_die_offset (attr);
22108 per_cu = dwarf2_find_containing_comp_unit (sect_off, 1,
22109 dwarf2_per_objfile);
22110 this_type = get_die_type_at_offset (sect_off, per_cu);
22112 else if (attr_form_is_ref (attr))
22114 sect_offset sect_off = dwarf2_get_ref_die_offset (attr);
22116 this_type = get_die_type_at_offset (sect_off, cu->per_cu);
22118 else if (attr->form == DW_FORM_ref_sig8)
22120 ULONGEST signature = DW_SIGNATURE (attr);
22122 return get_signatured_type (die, signature, cu);
22126 complaint (_("Dwarf Error: Bad type attribute %s in DIE"
22127 " at %s [in module %s]"),
22128 dwarf_attr_name (attr->name), sect_offset_str (die->sect_off),
22129 objfile_name (objfile));
22130 return build_error_marker_type (cu, die);
22133 /* If not cached we need to read it in. */
22135 if (this_type == NULL)
22137 struct die_info *type_die = NULL;
22138 struct dwarf2_cu *type_cu = cu;
22140 if (attr_form_is_ref (attr))
22141 type_die = follow_die_ref (die, attr, &type_cu);
22142 if (type_die == NULL)
22143 return build_error_marker_type (cu, die);
22144 /* If we find the type now, it's probably because the type came
22145 from an inter-CU reference and the type's CU got expanded before
22147 this_type = read_type_die (type_die, type_cu);
22150 /* If we still don't have a type use an error marker. */
22152 if (this_type == NULL)
22153 return build_error_marker_type (cu, die);
22158 /* Return the type in DIE, CU.
22159 Returns NULL for invalid types.
22161 This first does a lookup in die_type_hash,
22162 and only reads the die in if necessary.
22164 NOTE: This can be called when reading in partial or full symbols. */
22166 static struct type *
22167 read_type_die (struct die_info *die, struct dwarf2_cu *cu)
22169 struct type *this_type;
22171 this_type = get_die_type (die, cu);
22175 return read_type_die_1 (die, cu);
22178 /* Read the type in DIE, CU.
22179 Returns NULL for invalid types. */
22181 static struct type *
22182 read_type_die_1 (struct die_info *die, struct dwarf2_cu *cu)
22184 struct type *this_type = NULL;
22188 case DW_TAG_class_type:
22189 case DW_TAG_interface_type:
22190 case DW_TAG_structure_type:
22191 case DW_TAG_union_type:
22192 this_type = read_structure_type (die, cu);
22194 case DW_TAG_enumeration_type:
22195 this_type = read_enumeration_type (die, cu);
22197 case DW_TAG_subprogram:
22198 case DW_TAG_subroutine_type:
22199 case DW_TAG_inlined_subroutine:
22200 this_type = read_subroutine_type (die, cu);
22202 case DW_TAG_array_type:
22203 this_type = read_array_type (die, cu);
22205 case DW_TAG_set_type:
22206 this_type = read_set_type (die, cu);
22208 case DW_TAG_pointer_type:
22209 this_type = read_tag_pointer_type (die, cu);
22211 case DW_TAG_ptr_to_member_type:
22212 this_type = read_tag_ptr_to_member_type (die, cu);
22214 case DW_TAG_reference_type:
22215 this_type = read_tag_reference_type (die, cu, TYPE_CODE_REF);
22217 case DW_TAG_rvalue_reference_type:
22218 this_type = read_tag_reference_type (die, cu, TYPE_CODE_RVALUE_REF);
22220 case DW_TAG_const_type:
22221 this_type = read_tag_const_type (die, cu);
22223 case DW_TAG_volatile_type:
22224 this_type = read_tag_volatile_type (die, cu);
22226 case DW_TAG_restrict_type:
22227 this_type = read_tag_restrict_type (die, cu);
22229 case DW_TAG_string_type:
22230 this_type = read_tag_string_type (die, cu);
22232 case DW_TAG_typedef:
22233 this_type = read_typedef (die, cu);
22235 case DW_TAG_subrange_type:
22236 this_type = read_subrange_type (die, cu);
22238 case DW_TAG_base_type:
22239 this_type = read_base_type (die, cu);
22241 case DW_TAG_unspecified_type:
22242 this_type = read_unspecified_type (die, cu);
22244 case DW_TAG_namespace:
22245 this_type = read_namespace_type (die, cu);
22247 case DW_TAG_module:
22248 this_type = read_module_type (die, cu);
22250 case DW_TAG_atomic_type:
22251 this_type = read_tag_atomic_type (die, cu);
22254 complaint (_("unexpected tag in read_type_die: '%s'"),
22255 dwarf_tag_name (die->tag));
22262 /* See if we can figure out if the class lives in a namespace. We do
22263 this by looking for a member function; its demangled name will
22264 contain namespace info, if there is any.
22265 Return the computed name or NULL.
22266 Space for the result is allocated on the objfile's obstack.
22267 This is the full-die version of guess_partial_die_structure_name.
22268 In this case we know DIE has no useful parent. */
22271 guess_full_die_structure_name (struct die_info *die, struct dwarf2_cu *cu)
22273 struct die_info *spec_die;
22274 struct dwarf2_cu *spec_cu;
22275 struct die_info *child;
22276 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
22279 spec_die = die_specification (die, &spec_cu);
22280 if (spec_die != NULL)
22286 for (child = die->child;
22288 child = child->sibling)
22290 if (child->tag == DW_TAG_subprogram)
22292 const char *linkage_name = dw2_linkage_name (child, cu);
22294 if (linkage_name != NULL)
22297 = language_class_name_from_physname (cu->language_defn,
22301 if (actual_name != NULL)
22303 const char *die_name = dwarf2_name (die, cu);
22305 if (die_name != NULL
22306 && strcmp (die_name, actual_name) != 0)
22308 /* Strip off the class name from the full name.
22309 We want the prefix. */
22310 int die_name_len = strlen (die_name);
22311 int actual_name_len = strlen (actual_name);
22313 /* Test for '::' as a sanity check. */
22314 if (actual_name_len > die_name_len + 2
22315 && actual_name[actual_name_len
22316 - die_name_len - 1] == ':')
22317 name = (char *) obstack_copy0 (
22318 &objfile->per_bfd->storage_obstack,
22319 actual_name, actual_name_len - die_name_len - 2);
22322 xfree (actual_name);
22331 /* GCC might emit a nameless typedef that has a linkage name. Determine the
22332 prefix part in such case. See
22333 http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47510. */
22335 static const char *
22336 anonymous_struct_prefix (struct die_info *die, struct dwarf2_cu *cu)
22338 struct attribute *attr;
22341 if (die->tag != DW_TAG_class_type && die->tag != DW_TAG_interface_type
22342 && die->tag != DW_TAG_structure_type && die->tag != DW_TAG_union_type)
22345 if (dwarf2_string_attr (die, DW_AT_name, cu) != NULL)
22348 attr = dw2_linkage_name_attr (die, cu);
22349 if (attr == NULL || DW_STRING (attr) == NULL)
22352 /* dwarf2_name had to be already called. */
22353 gdb_assert (DW_STRING_IS_CANONICAL (attr));
22355 /* Strip the base name, keep any leading namespaces/classes. */
22356 base = strrchr (DW_STRING (attr), ':');
22357 if (base == NULL || base == DW_STRING (attr) || base[-1] != ':')
22360 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
22361 return (char *) obstack_copy0 (&objfile->per_bfd->storage_obstack,
22363 &base[-1] - DW_STRING (attr));
22366 /* Return the name of the namespace/class that DIE is defined within,
22367 or "" if we can't tell. The caller should not xfree the result.
22369 For example, if we're within the method foo() in the following
22379 then determine_prefix on foo's die will return "N::C". */
22381 static const char *
22382 determine_prefix (struct die_info *die, struct dwarf2_cu *cu)
22384 struct dwarf2_per_objfile *dwarf2_per_objfile
22385 = cu->per_cu->dwarf2_per_objfile;
22386 struct die_info *parent, *spec_die;
22387 struct dwarf2_cu *spec_cu;
22388 struct type *parent_type;
22389 const char *retval;
22391 if (cu->language != language_cplus
22392 && cu->language != language_fortran && cu->language != language_d
22393 && cu->language != language_rust)
22396 retval = anonymous_struct_prefix (die, cu);
22400 /* We have to be careful in the presence of DW_AT_specification.
22401 For example, with GCC 3.4, given the code
22405 // Definition of N::foo.
22409 then we'll have a tree of DIEs like this:
22411 1: DW_TAG_compile_unit
22412 2: DW_TAG_namespace // N
22413 3: DW_TAG_subprogram // declaration of N::foo
22414 4: DW_TAG_subprogram // definition of N::foo
22415 DW_AT_specification // refers to die #3
22417 Thus, when processing die #4, we have to pretend that we're in
22418 the context of its DW_AT_specification, namely the contex of die
22421 spec_die = die_specification (die, &spec_cu);
22422 if (spec_die == NULL)
22423 parent = die->parent;
22426 parent = spec_die->parent;
22430 if (parent == NULL)
22432 else if (parent->building_fullname)
22435 const char *parent_name;
22437 /* It has been seen on RealView 2.2 built binaries,
22438 DW_TAG_template_type_param types actually _defined_ as
22439 children of the parent class:
22442 template class <class Enum> Class{};
22443 Class<enum E> class_e;
22445 1: DW_TAG_class_type (Class)
22446 2: DW_TAG_enumeration_type (E)
22447 3: DW_TAG_enumerator (enum1:0)
22448 3: DW_TAG_enumerator (enum2:1)
22450 2: DW_TAG_template_type_param
22451 DW_AT_type DW_FORM_ref_udata (E)
22453 Besides being broken debug info, it can put GDB into an
22454 infinite loop. Consider:
22456 When we're building the full name for Class<E>, we'll start
22457 at Class, and go look over its template type parameters,
22458 finding E. We'll then try to build the full name of E, and
22459 reach here. We're now trying to build the full name of E,
22460 and look over the parent DIE for containing scope. In the
22461 broken case, if we followed the parent DIE of E, we'd again
22462 find Class, and once again go look at its template type
22463 arguments, etc., etc. Simply don't consider such parent die
22464 as source-level parent of this die (it can't be, the language
22465 doesn't allow it), and break the loop here. */
22466 name = dwarf2_name (die, cu);
22467 parent_name = dwarf2_name (parent, cu);
22468 complaint (_("template param type '%s' defined within parent '%s'"),
22469 name ? name : "<unknown>",
22470 parent_name ? parent_name : "<unknown>");
22474 switch (parent->tag)
22476 case DW_TAG_namespace:
22477 parent_type = read_type_die (parent, cu);
22478 /* GCC 4.0 and 4.1 had a bug (PR c++/28460) where they generated bogus
22479 DW_TAG_namespace DIEs with a name of "::" for the global namespace.
22480 Work around this problem here. */
22481 if (cu->language == language_cplus
22482 && strcmp (TYPE_NAME (parent_type), "::") == 0)
22484 /* We give a name to even anonymous namespaces. */
22485 return TYPE_NAME (parent_type);
22486 case DW_TAG_class_type:
22487 case DW_TAG_interface_type:
22488 case DW_TAG_structure_type:
22489 case DW_TAG_union_type:
22490 case DW_TAG_module:
22491 parent_type = read_type_die (parent, cu);
22492 if (TYPE_NAME (parent_type) != NULL)
22493 return TYPE_NAME (parent_type);
22495 /* An anonymous structure is only allowed non-static data
22496 members; no typedefs, no member functions, et cetera.
22497 So it does not need a prefix. */
22499 case DW_TAG_compile_unit:
22500 case DW_TAG_partial_unit:
22501 /* gcc-4.5 -gdwarf-4 can drop the enclosing namespace. Cope. */
22502 if (cu->language == language_cplus
22503 && !VEC_empty (dwarf2_section_info_def, dwarf2_per_objfile->types)
22504 && die->child != NULL
22505 && (die->tag == DW_TAG_class_type
22506 || die->tag == DW_TAG_structure_type
22507 || die->tag == DW_TAG_union_type))
22509 char *name = guess_full_die_structure_name (die, cu);
22514 case DW_TAG_enumeration_type:
22515 parent_type = read_type_die (parent, cu);
22516 if (TYPE_DECLARED_CLASS (parent_type))
22518 if (TYPE_NAME (parent_type) != NULL)
22519 return TYPE_NAME (parent_type);
22522 /* Fall through. */
22524 return determine_prefix (parent, cu);
22528 /* Return a newly-allocated string formed by concatenating PREFIX and SUFFIX
22529 with appropriate separator. If PREFIX or SUFFIX is NULL or empty, then
22530 simply copy the SUFFIX or PREFIX, respectively. If OBS is non-null, perform
22531 an obconcat, otherwise allocate storage for the result. The CU argument is
22532 used to determine the language and hence, the appropriate separator. */
22534 #define MAX_SEP_LEN 7 /* strlen ("__") + strlen ("_MOD_") */
22537 typename_concat (struct obstack *obs, const char *prefix, const char *suffix,
22538 int physname, struct dwarf2_cu *cu)
22540 const char *lead = "";
22543 if (suffix == NULL || suffix[0] == '\0'
22544 || prefix == NULL || prefix[0] == '\0')
22546 else if (cu->language == language_d)
22548 /* For D, the 'main' function could be defined in any module, but it
22549 should never be prefixed. */
22550 if (strcmp (suffix, "D main") == 0)
22558 else if (cu->language == language_fortran && physname)
22560 /* This is gfortran specific mangling. Normally DW_AT_linkage_name or
22561 DW_AT_MIPS_linkage_name is preferred and used instead. */
22569 if (prefix == NULL)
22571 if (suffix == NULL)
22578 xmalloc (strlen (prefix) + MAX_SEP_LEN + strlen (suffix) + 1));
22580 strcpy (retval, lead);
22581 strcat (retval, prefix);
22582 strcat (retval, sep);
22583 strcat (retval, suffix);
22588 /* We have an obstack. */
22589 return obconcat (obs, lead, prefix, sep, suffix, (char *) NULL);
22593 /* Return sibling of die, NULL if no sibling. */
22595 static struct die_info *
22596 sibling_die (struct die_info *die)
22598 return die->sibling;
22601 /* Get name of a die, return NULL if not found. */
22603 static const char *
22604 dwarf2_canonicalize_name (const char *name, struct dwarf2_cu *cu,
22605 struct obstack *obstack)
22607 if (name && cu->language == language_cplus)
22609 std::string canon_name = cp_canonicalize_string (name);
22611 if (!canon_name.empty ())
22613 if (canon_name != name)
22614 name = (const char *) obstack_copy0 (obstack,
22615 canon_name.c_str (),
22616 canon_name.length ());
22623 /* Get name of a die, return NULL if not found.
22624 Anonymous namespaces are converted to their magic string. */
22626 static const char *
22627 dwarf2_name (struct die_info *die, struct dwarf2_cu *cu)
22629 struct attribute *attr;
22630 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
22632 attr = dwarf2_attr (die, DW_AT_name, cu);
22633 if ((!attr || !DW_STRING (attr))
22634 && die->tag != DW_TAG_namespace
22635 && die->tag != DW_TAG_class_type
22636 && die->tag != DW_TAG_interface_type
22637 && die->tag != DW_TAG_structure_type
22638 && die->tag != DW_TAG_union_type)
22643 case DW_TAG_compile_unit:
22644 case DW_TAG_partial_unit:
22645 /* Compilation units have a DW_AT_name that is a filename, not
22646 a source language identifier. */
22647 case DW_TAG_enumeration_type:
22648 case DW_TAG_enumerator:
22649 /* These tags always have simple identifiers already; no need
22650 to canonicalize them. */
22651 return DW_STRING (attr);
22653 case DW_TAG_namespace:
22654 if (attr != NULL && DW_STRING (attr) != NULL)
22655 return DW_STRING (attr);
22656 return CP_ANONYMOUS_NAMESPACE_STR;
22658 case DW_TAG_class_type:
22659 case DW_TAG_interface_type:
22660 case DW_TAG_structure_type:
22661 case DW_TAG_union_type:
22662 /* Some GCC versions emit spurious DW_AT_name attributes for unnamed
22663 structures or unions. These were of the form "._%d" in GCC 4.1,
22664 or simply "<anonymous struct>" or "<anonymous union>" in GCC 4.3
22665 and GCC 4.4. We work around this problem by ignoring these. */
22666 if (attr && DW_STRING (attr)
22667 && (startswith (DW_STRING (attr), "._")
22668 || startswith (DW_STRING (attr), "<anonymous")))
22671 /* GCC might emit a nameless typedef that has a linkage name. See
22672 http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47510. */
22673 if (!attr || DW_STRING (attr) == NULL)
22675 char *demangled = NULL;
22677 attr = dw2_linkage_name_attr (die, cu);
22678 if (attr == NULL || DW_STRING (attr) == NULL)
22681 /* Avoid demangling DW_STRING (attr) the second time on a second
22682 call for the same DIE. */
22683 if (!DW_STRING_IS_CANONICAL (attr))
22684 demangled = gdb_demangle (DW_STRING (attr), DMGL_TYPES);
22690 /* FIXME: we already did this for the partial symbol... */
22693 obstack_copy0 (&objfile->per_bfd->storage_obstack,
22694 demangled, strlen (demangled)));
22695 DW_STRING_IS_CANONICAL (attr) = 1;
22698 /* Strip any leading namespaces/classes, keep only the base name.
22699 DW_AT_name for named DIEs does not contain the prefixes. */
22700 base = strrchr (DW_STRING (attr), ':');
22701 if (base && base > DW_STRING (attr) && base[-1] == ':')
22704 return DW_STRING (attr);
22713 if (!DW_STRING_IS_CANONICAL (attr))
22716 = dwarf2_canonicalize_name (DW_STRING (attr), cu,
22717 &objfile->per_bfd->storage_obstack);
22718 DW_STRING_IS_CANONICAL (attr) = 1;
22720 return DW_STRING (attr);
22723 /* Return the die that this die in an extension of, or NULL if there
22724 is none. *EXT_CU is the CU containing DIE on input, and the CU
22725 containing the return value on output. */
22727 static struct die_info *
22728 dwarf2_extension (struct die_info *die, struct dwarf2_cu **ext_cu)
22730 struct attribute *attr;
22732 attr = dwarf2_attr (die, DW_AT_extension, *ext_cu);
22736 return follow_die_ref (die, attr, ext_cu);
22739 /* Convert a DIE tag into its string name. */
22741 static const char *
22742 dwarf_tag_name (unsigned tag)
22744 const char *name = get_DW_TAG_name (tag);
22747 return "DW_TAG_<unknown>";
22752 /* Convert a DWARF attribute code into its string name. */
22754 static const char *
22755 dwarf_attr_name (unsigned attr)
22759 #ifdef MIPS /* collides with DW_AT_HP_block_index */
22760 if (attr == DW_AT_MIPS_fde)
22761 return "DW_AT_MIPS_fde";
22763 if (attr == DW_AT_HP_block_index)
22764 return "DW_AT_HP_block_index";
22767 name = get_DW_AT_name (attr);
22770 return "DW_AT_<unknown>";
22775 /* Convert a DWARF value form code into its string name. */
22777 static const char *
22778 dwarf_form_name (unsigned form)
22780 const char *name = get_DW_FORM_name (form);
22783 return "DW_FORM_<unknown>";
22788 static const char *
22789 dwarf_bool_name (unsigned mybool)
22797 /* Convert a DWARF type code into its string name. */
22799 static const char *
22800 dwarf_type_encoding_name (unsigned enc)
22802 const char *name = get_DW_ATE_name (enc);
22805 return "DW_ATE_<unknown>";
22811 dump_die_shallow (struct ui_file *f, int indent, struct die_info *die)
22815 print_spaces (indent, f);
22816 fprintf_unfiltered (f, "Die: %s (abbrev %d, offset %s)\n",
22817 dwarf_tag_name (die->tag), die->abbrev,
22818 sect_offset_str (die->sect_off));
22820 if (die->parent != NULL)
22822 print_spaces (indent, f);
22823 fprintf_unfiltered (f, " parent at offset: %s\n",
22824 sect_offset_str (die->parent->sect_off));
22827 print_spaces (indent, f);
22828 fprintf_unfiltered (f, " has children: %s\n",
22829 dwarf_bool_name (die->child != NULL));
22831 print_spaces (indent, f);
22832 fprintf_unfiltered (f, " attributes:\n");
22834 for (i = 0; i < die->num_attrs; ++i)
22836 print_spaces (indent, f);
22837 fprintf_unfiltered (f, " %s (%s) ",
22838 dwarf_attr_name (die->attrs[i].name),
22839 dwarf_form_name (die->attrs[i].form));
22841 switch (die->attrs[i].form)
22844 case DW_FORM_addrx:
22845 case DW_FORM_GNU_addr_index:
22846 fprintf_unfiltered (f, "address: ");
22847 fputs_filtered (hex_string (DW_ADDR (&die->attrs[i])), f);
22849 case DW_FORM_block2:
22850 case DW_FORM_block4:
22851 case DW_FORM_block:
22852 case DW_FORM_block1:
22853 fprintf_unfiltered (f, "block: size %s",
22854 pulongest (DW_BLOCK (&die->attrs[i])->size));
22856 case DW_FORM_exprloc:
22857 fprintf_unfiltered (f, "expression: size %s",
22858 pulongest (DW_BLOCK (&die->attrs[i])->size));
22860 case DW_FORM_data16:
22861 fprintf_unfiltered (f, "constant of 16 bytes");
22863 case DW_FORM_ref_addr:
22864 fprintf_unfiltered (f, "ref address: ");
22865 fputs_filtered (hex_string (DW_UNSND (&die->attrs[i])), f);
22867 case DW_FORM_GNU_ref_alt:
22868 fprintf_unfiltered (f, "alt ref address: ");
22869 fputs_filtered (hex_string (DW_UNSND (&die->attrs[i])), f);
22875 case DW_FORM_ref_udata:
22876 fprintf_unfiltered (f, "constant ref: 0x%lx (adjusted)",
22877 (long) (DW_UNSND (&die->attrs[i])));
22879 case DW_FORM_data1:
22880 case DW_FORM_data2:
22881 case DW_FORM_data4:
22882 case DW_FORM_data8:
22883 case DW_FORM_udata:
22884 case DW_FORM_sdata:
22885 fprintf_unfiltered (f, "constant: %s",
22886 pulongest (DW_UNSND (&die->attrs[i])));
22888 case DW_FORM_sec_offset:
22889 fprintf_unfiltered (f, "section offset: %s",
22890 pulongest (DW_UNSND (&die->attrs[i])));
22892 case DW_FORM_ref_sig8:
22893 fprintf_unfiltered (f, "signature: %s",
22894 hex_string (DW_SIGNATURE (&die->attrs[i])));
22896 case DW_FORM_string:
22898 case DW_FORM_line_strp:
22900 case DW_FORM_GNU_str_index:
22901 case DW_FORM_GNU_strp_alt:
22902 fprintf_unfiltered (f, "string: \"%s\" (%s canonicalized)",
22903 DW_STRING (&die->attrs[i])
22904 ? DW_STRING (&die->attrs[i]) : "",
22905 DW_STRING_IS_CANONICAL (&die->attrs[i]) ? "is" : "not");
22908 if (DW_UNSND (&die->attrs[i]))
22909 fprintf_unfiltered (f, "flag: TRUE");
22911 fprintf_unfiltered (f, "flag: FALSE");
22913 case DW_FORM_flag_present:
22914 fprintf_unfiltered (f, "flag: TRUE");
22916 case DW_FORM_indirect:
22917 /* The reader will have reduced the indirect form to
22918 the "base form" so this form should not occur. */
22919 fprintf_unfiltered (f,
22920 "unexpected attribute form: DW_FORM_indirect");
22922 case DW_FORM_implicit_const:
22923 fprintf_unfiltered (f, "constant: %s",
22924 plongest (DW_SND (&die->attrs[i])));
22927 fprintf_unfiltered (f, "unsupported attribute form: %d.",
22928 die->attrs[i].form);
22931 fprintf_unfiltered (f, "\n");
22936 dump_die_for_error (struct die_info *die)
22938 dump_die_shallow (gdb_stderr, 0, die);
22942 dump_die_1 (struct ui_file *f, int level, int max_level, struct die_info *die)
22944 int indent = level * 4;
22946 gdb_assert (die != NULL);
22948 if (level >= max_level)
22951 dump_die_shallow (f, indent, die);
22953 if (die->child != NULL)
22955 print_spaces (indent, f);
22956 fprintf_unfiltered (f, " Children:");
22957 if (level + 1 < max_level)
22959 fprintf_unfiltered (f, "\n");
22960 dump_die_1 (f, level + 1, max_level, die->child);
22964 fprintf_unfiltered (f,
22965 " [not printed, max nesting level reached]\n");
22969 if (die->sibling != NULL && level > 0)
22971 dump_die_1 (f, level, max_level, die->sibling);
22975 /* This is called from the pdie macro in gdbinit.in.
22976 It's not static so gcc will keep a copy callable from gdb. */
22979 dump_die (struct die_info *die, int max_level)
22981 dump_die_1 (gdb_stdlog, 0, max_level, die);
22985 store_in_ref_table (struct die_info *die, struct dwarf2_cu *cu)
22989 slot = htab_find_slot_with_hash (cu->die_hash, die,
22990 to_underlying (die->sect_off),
22996 /* Return DIE offset of ATTR. Return 0 with complaint if ATTR is not of the
23000 dwarf2_get_ref_die_offset (const struct attribute *attr)
23002 if (attr_form_is_ref (attr))
23003 return (sect_offset) DW_UNSND (attr);
23005 complaint (_("unsupported die ref attribute form: '%s'"),
23006 dwarf_form_name (attr->form));
23010 /* Return the constant value held by ATTR. Return DEFAULT_VALUE if
23011 * the value held by the attribute is not constant. */
23014 dwarf2_get_attr_constant_value (const struct attribute *attr, int default_value)
23016 if (attr->form == DW_FORM_sdata || attr->form == DW_FORM_implicit_const)
23017 return DW_SND (attr);
23018 else if (attr->form == DW_FORM_udata
23019 || attr->form == DW_FORM_data1
23020 || attr->form == DW_FORM_data2
23021 || attr->form == DW_FORM_data4
23022 || attr->form == DW_FORM_data8)
23023 return DW_UNSND (attr);
23026 /* For DW_FORM_data16 see attr_form_is_constant. */
23027 complaint (_("Attribute value is not a constant (%s)"),
23028 dwarf_form_name (attr->form));
23029 return default_value;
23033 /* Follow reference or signature attribute ATTR of SRC_DIE.
23034 On entry *REF_CU is the CU of SRC_DIE.
23035 On exit *REF_CU is the CU of the result. */
23037 static struct die_info *
23038 follow_die_ref_or_sig (struct die_info *src_die, const struct attribute *attr,
23039 struct dwarf2_cu **ref_cu)
23041 struct die_info *die;
23043 if (attr_form_is_ref (attr))
23044 die = follow_die_ref (src_die, attr, ref_cu);
23045 else if (attr->form == DW_FORM_ref_sig8)
23046 die = follow_die_sig (src_die, attr, ref_cu);
23049 dump_die_for_error (src_die);
23050 error (_("Dwarf Error: Expected reference attribute [in module %s]"),
23051 objfile_name ((*ref_cu)->per_cu->dwarf2_per_objfile->objfile));
23057 /* Follow reference OFFSET.
23058 On entry *REF_CU is the CU of the source die referencing OFFSET.
23059 On exit *REF_CU is the CU of the result.
23060 Returns NULL if OFFSET is invalid. */
23062 static struct die_info *
23063 follow_die_offset (sect_offset sect_off, int offset_in_dwz,
23064 struct dwarf2_cu **ref_cu)
23066 struct die_info temp_die;
23067 struct dwarf2_cu *target_cu, *cu = *ref_cu;
23068 struct dwarf2_per_objfile *dwarf2_per_objfile
23069 = cu->per_cu->dwarf2_per_objfile;
23071 gdb_assert (cu->per_cu != NULL);
23075 if (cu->per_cu->is_debug_types)
23077 /* .debug_types CUs cannot reference anything outside their CU.
23078 If they need to, they have to reference a signatured type via
23079 DW_FORM_ref_sig8. */
23080 if (!offset_in_cu_p (&cu->header, sect_off))
23083 else if (offset_in_dwz != cu->per_cu->is_dwz
23084 || !offset_in_cu_p (&cu->header, sect_off))
23086 struct dwarf2_per_cu_data *per_cu;
23088 per_cu = dwarf2_find_containing_comp_unit (sect_off, offset_in_dwz,
23089 dwarf2_per_objfile);
23091 /* If necessary, add it to the queue and load its DIEs. */
23092 if (maybe_queue_comp_unit (cu, per_cu, cu->language))
23093 load_full_comp_unit (per_cu, false, cu->language);
23095 target_cu = per_cu->cu;
23097 else if (cu->dies == NULL)
23099 /* We're loading full DIEs during partial symbol reading. */
23100 gdb_assert (dwarf2_per_objfile->reading_partial_symbols);
23101 load_full_comp_unit (cu->per_cu, false, language_minimal);
23104 *ref_cu = target_cu;
23105 temp_die.sect_off = sect_off;
23107 if (target_cu != cu)
23108 target_cu->ancestor = cu;
23110 return (struct die_info *) htab_find_with_hash (target_cu->die_hash,
23112 to_underlying (sect_off));
23115 /* Follow reference attribute ATTR of SRC_DIE.
23116 On entry *REF_CU is the CU of SRC_DIE.
23117 On exit *REF_CU is the CU of the result. */
23119 static struct die_info *
23120 follow_die_ref (struct die_info *src_die, const struct attribute *attr,
23121 struct dwarf2_cu **ref_cu)
23123 sect_offset sect_off = dwarf2_get_ref_die_offset (attr);
23124 struct dwarf2_cu *cu = *ref_cu;
23125 struct die_info *die;
23127 die = follow_die_offset (sect_off,
23128 (attr->form == DW_FORM_GNU_ref_alt
23129 || cu->per_cu->is_dwz),
23132 error (_("Dwarf Error: Cannot find DIE at %s referenced from DIE "
23133 "at %s [in module %s]"),
23134 sect_offset_str (sect_off), sect_offset_str (src_die->sect_off),
23135 objfile_name (cu->per_cu->dwarf2_per_objfile->objfile));
23140 /* Return DWARF block referenced by DW_AT_location of DIE at SECT_OFF at PER_CU.
23141 Returned value is intended for DW_OP_call*. Returned
23142 dwarf2_locexpr_baton->data has lifetime of
23143 PER_CU->DWARF2_PER_OBJFILE->OBJFILE. */
23145 struct dwarf2_locexpr_baton
23146 dwarf2_fetch_die_loc_sect_off (sect_offset sect_off,
23147 struct dwarf2_per_cu_data *per_cu,
23148 CORE_ADDR (*get_frame_pc) (void *baton),
23149 void *baton, bool resolve_abstract_p)
23151 struct dwarf2_cu *cu;
23152 struct die_info *die;
23153 struct attribute *attr;
23154 struct dwarf2_locexpr_baton retval;
23155 struct dwarf2_per_objfile *dwarf2_per_objfile = per_cu->dwarf2_per_objfile;
23156 struct objfile *objfile = dwarf2_per_objfile->objfile;
23158 if (per_cu->cu == NULL)
23159 load_cu (per_cu, false);
23163 /* We shouldn't get here for a dummy CU, but don't crash on the user.
23164 Instead just throw an error, not much else we can do. */
23165 error (_("Dwarf Error: Dummy CU at %s referenced in module %s"),
23166 sect_offset_str (sect_off), objfile_name (objfile));
23169 die = follow_die_offset (sect_off, per_cu->is_dwz, &cu);
23171 error (_("Dwarf Error: Cannot find DIE at %s referenced in module %s"),
23172 sect_offset_str (sect_off), objfile_name (objfile));
23174 attr = dwarf2_attr (die, DW_AT_location, cu);
23175 if (!attr && resolve_abstract_p
23176 && (dwarf2_per_objfile->abstract_to_concrete.find (die)
23177 != dwarf2_per_objfile->abstract_to_concrete.end ()))
23179 CORE_ADDR pc = (*get_frame_pc) (baton);
23181 for (const auto &cand : dwarf2_per_objfile->abstract_to_concrete[die])
23184 || cand->parent->tag != DW_TAG_subprogram)
23187 CORE_ADDR pc_low, pc_high;
23188 get_scope_pc_bounds (cand->parent, &pc_low, &pc_high, cu);
23189 if (pc_low == ((CORE_ADDR) -1)
23190 || !(pc_low <= pc && pc < pc_high))
23194 attr = dwarf2_attr (die, DW_AT_location, cu);
23201 /* DWARF: "If there is no such attribute, then there is no effect.".
23202 DATA is ignored if SIZE is 0. */
23204 retval.data = NULL;
23207 else if (attr_form_is_section_offset (attr))
23209 struct dwarf2_loclist_baton loclist_baton;
23210 CORE_ADDR pc = (*get_frame_pc) (baton);
23213 fill_in_loclist_baton (cu, &loclist_baton, attr);
23215 retval.data = dwarf2_find_location_expression (&loclist_baton,
23217 retval.size = size;
23221 if (!attr_form_is_block (attr))
23222 error (_("Dwarf Error: DIE at %s referenced in module %s "
23223 "is neither DW_FORM_block* nor DW_FORM_exprloc"),
23224 sect_offset_str (sect_off), objfile_name (objfile));
23226 retval.data = DW_BLOCK (attr)->data;
23227 retval.size = DW_BLOCK (attr)->size;
23229 retval.per_cu = cu->per_cu;
23231 age_cached_comp_units (dwarf2_per_objfile);
23236 /* Like dwarf2_fetch_die_loc_sect_off, but take a CU
23239 struct dwarf2_locexpr_baton
23240 dwarf2_fetch_die_loc_cu_off (cu_offset offset_in_cu,
23241 struct dwarf2_per_cu_data *per_cu,
23242 CORE_ADDR (*get_frame_pc) (void *baton),
23245 sect_offset sect_off = per_cu->sect_off + to_underlying (offset_in_cu);
23247 return dwarf2_fetch_die_loc_sect_off (sect_off, per_cu, get_frame_pc, baton);
23250 /* Write a constant of a given type as target-ordered bytes into
23253 static const gdb_byte *
23254 write_constant_as_bytes (struct obstack *obstack,
23255 enum bfd_endian byte_order,
23262 *len = TYPE_LENGTH (type);
23263 result = (gdb_byte *) obstack_alloc (obstack, *len);
23264 store_unsigned_integer (result, *len, byte_order, value);
23269 /* If the DIE at OFFSET in PER_CU has a DW_AT_const_value, return a
23270 pointer to the constant bytes and set LEN to the length of the
23271 data. If memory is needed, allocate it on OBSTACK. If the DIE
23272 does not have a DW_AT_const_value, return NULL. */
23275 dwarf2_fetch_constant_bytes (sect_offset sect_off,
23276 struct dwarf2_per_cu_data *per_cu,
23277 struct obstack *obstack,
23280 struct dwarf2_cu *cu;
23281 struct die_info *die;
23282 struct attribute *attr;
23283 const gdb_byte *result = NULL;
23286 enum bfd_endian byte_order;
23287 struct objfile *objfile = per_cu->dwarf2_per_objfile->objfile;
23289 if (per_cu->cu == NULL)
23290 load_cu (per_cu, false);
23294 /* We shouldn't get here for a dummy CU, but don't crash on the user.
23295 Instead just throw an error, not much else we can do. */
23296 error (_("Dwarf Error: Dummy CU at %s referenced in module %s"),
23297 sect_offset_str (sect_off), objfile_name (objfile));
23300 die = follow_die_offset (sect_off, per_cu->is_dwz, &cu);
23302 error (_("Dwarf Error: Cannot find DIE at %s referenced in module %s"),
23303 sect_offset_str (sect_off), objfile_name (objfile));
23305 attr = dwarf2_attr (die, DW_AT_const_value, cu);
23309 byte_order = (bfd_big_endian (objfile->obfd)
23310 ? BFD_ENDIAN_BIG : BFD_ENDIAN_LITTLE);
23312 switch (attr->form)
23315 case DW_FORM_addrx:
23316 case DW_FORM_GNU_addr_index:
23320 *len = cu->header.addr_size;
23321 tem = (gdb_byte *) obstack_alloc (obstack, *len);
23322 store_unsigned_integer (tem, *len, byte_order, DW_ADDR (attr));
23326 case DW_FORM_string:
23329 case DW_FORM_GNU_str_index:
23330 case DW_FORM_GNU_strp_alt:
23331 /* DW_STRING is already allocated on the objfile obstack, point
23333 result = (const gdb_byte *) DW_STRING (attr);
23334 *len = strlen (DW_STRING (attr));
23336 case DW_FORM_block1:
23337 case DW_FORM_block2:
23338 case DW_FORM_block4:
23339 case DW_FORM_block:
23340 case DW_FORM_exprloc:
23341 case DW_FORM_data16:
23342 result = DW_BLOCK (attr)->data;
23343 *len = DW_BLOCK (attr)->size;
23346 /* The DW_AT_const_value attributes are supposed to carry the
23347 symbol's value "represented as it would be on the target
23348 architecture." By the time we get here, it's already been
23349 converted to host endianness, so we just need to sign- or
23350 zero-extend it as appropriate. */
23351 case DW_FORM_data1:
23352 type = die_type (die, cu);
23353 result = dwarf2_const_value_data (attr, obstack, cu, &value, 8);
23354 if (result == NULL)
23355 result = write_constant_as_bytes (obstack, byte_order,
23358 case DW_FORM_data2:
23359 type = die_type (die, cu);
23360 result = dwarf2_const_value_data (attr, obstack, cu, &value, 16);
23361 if (result == NULL)
23362 result = write_constant_as_bytes (obstack, byte_order,
23365 case DW_FORM_data4:
23366 type = die_type (die, cu);
23367 result = dwarf2_const_value_data (attr, obstack, cu, &value, 32);
23368 if (result == NULL)
23369 result = write_constant_as_bytes (obstack, byte_order,
23372 case DW_FORM_data8:
23373 type = die_type (die, cu);
23374 result = dwarf2_const_value_data (attr, obstack, cu, &value, 64);
23375 if (result == NULL)
23376 result = write_constant_as_bytes (obstack, byte_order,
23380 case DW_FORM_sdata:
23381 case DW_FORM_implicit_const:
23382 type = die_type (die, cu);
23383 result = write_constant_as_bytes (obstack, byte_order,
23384 type, DW_SND (attr), len);
23387 case DW_FORM_udata:
23388 type = die_type (die, cu);
23389 result = write_constant_as_bytes (obstack, byte_order,
23390 type, DW_UNSND (attr), len);
23394 complaint (_("unsupported const value attribute form: '%s'"),
23395 dwarf_form_name (attr->form));
23402 /* Return the type of the die at OFFSET in PER_CU. Return NULL if no
23403 valid type for this die is found. */
23406 dwarf2_fetch_die_type_sect_off (sect_offset sect_off,
23407 struct dwarf2_per_cu_data *per_cu)
23409 struct dwarf2_cu *cu;
23410 struct die_info *die;
23412 if (per_cu->cu == NULL)
23413 load_cu (per_cu, false);
23418 die = follow_die_offset (sect_off, per_cu->is_dwz, &cu);
23422 return die_type (die, cu);
23425 /* Return the type of the DIE at DIE_OFFSET in the CU named by
23429 dwarf2_get_die_type (cu_offset die_offset,
23430 struct dwarf2_per_cu_data *per_cu)
23432 sect_offset die_offset_sect = per_cu->sect_off + to_underlying (die_offset);
23433 return get_die_type_at_offset (die_offset_sect, per_cu);
23436 /* Follow type unit SIG_TYPE referenced by SRC_DIE.
23437 On entry *REF_CU is the CU of SRC_DIE.
23438 On exit *REF_CU is the CU of the result.
23439 Returns NULL if the referenced DIE isn't found. */
23441 static struct die_info *
23442 follow_die_sig_1 (struct die_info *src_die, struct signatured_type *sig_type,
23443 struct dwarf2_cu **ref_cu)
23445 struct die_info temp_die;
23446 struct dwarf2_cu *sig_cu, *cu = *ref_cu;
23447 struct die_info *die;
23449 /* While it might be nice to assert sig_type->type == NULL here,
23450 we can get here for DW_AT_imported_declaration where we need
23451 the DIE not the type. */
23453 /* If necessary, add it to the queue and load its DIEs. */
23455 if (maybe_queue_comp_unit (*ref_cu, &sig_type->per_cu, language_minimal))
23456 read_signatured_type (sig_type);
23458 sig_cu = sig_type->per_cu.cu;
23459 gdb_assert (sig_cu != NULL);
23460 gdb_assert (to_underlying (sig_type->type_offset_in_section) != 0);
23461 temp_die.sect_off = sig_type->type_offset_in_section;
23462 die = (struct die_info *) htab_find_with_hash (sig_cu->die_hash, &temp_die,
23463 to_underlying (temp_die.sect_off));
23466 struct dwarf2_per_objfile *dwarf2_per_objfile
23467 = (*ref_cu)->per_cu->dwarf2_per_objfile;
23469 /* For .gdb_index version 7 keep track of included TUs.
23470 http://sourceware.org/bugzilla/show_bug.cgi?id=15021. */
23471 if (dwarf2_per_objfile->index_table != NULL
23472 && dwarf2_per_objfile->index_table->version <= 7)
23474 VEC_safe_push (dwarf2_per_cu_ptr,
23475 (*ref_cu)->per_cu->imported_symtabs,
23481 sig_cu->ancestor = cu;
23489 /* Follow signatured type referenced by ATTR in SRC_DIE.
23490 On entry *REF_CU is the CU of SRC_DIE.
23491 On exit *REF_CU is the CU of the result.
23492 The result is the DIE of the type.
23493 If the referenced type cannot be found an error is thrown. */
23495 static struct die_info *
23496 follow_die_sig (struct die_info *src_die, const struct attribute *attr,
23497 struct dwarf2_cu **ref_cu)
23499 ULONGEST signature = DW_SIGNATURE (attr);
23500 struct signatured_type *sig_type;
23501 struct die_info *die;
23503 gdb_assert (attr->form == DW_FORM_ref_sig8);
23505 sig_type = lookup_signatured_type (*ref_cu, signature);
23506 /* sig_type will be NULL if the signatured type is missing from
23508 if (sig_type == NULL)
23510 error (_("Dwarf Error: Cannot find signatured DIE %s referenced"
23511 " from DIE at %s [in module %s]"),
23512 hex_string (signature), sect_offset_str (src_die->sect_off),
23513 objfile_name ((*ref_cu)->per_cu->dwarf2_per_objfile->objfile));
23516 die = follow_die_sig_1 (src_die, sig_type, ref_cu);
23519 dump_die_for_error (src_die);
23520 error (_("Dwarf Error: Problem reading signatured DIE %s referenced"
23521 " from DIE at %s [in module %s]"),
23522 hex_string (signature), sect_offset_str (src_die->sect_off),
23523 objfile_name ((*ref_cu)->per_cu->dwarf2_per_objfile->objfile));
23529 /* Get the type specified by SIGNATURE referenced in DIE/CU,
23530 reading in and processing the type unit if necessary. */
23532 static struct type *
23533 get_signatured_type (struct die_info *die, ULONGEST signature,
23534 struct dwarf2_cu *cu)
23536 struct dwarf2_per_objfile *dwarf2_per_objfile
23537 = cu->per_cu->dwarf2_per_objfile;
23538 struct signatured_type *sig_type;
23539 struct dwarf2_cu *type_cu;
23540 struct die_info *type_die;
23543 sig_type = lookup_signatured_type (cu, signature);
23544 /* sig_type will be NULL if the signatured type is missing from
23546 if (sig_type == NULL)
23548 complaint (_("Dwarf Error: Cannot find signatured DIE %s referenced"
23549 " from DIE at %s [in module %s]"),
23550 hex_string (signature), sect_offset_str (die->sect_off),
23551 objfile_name (dwarf2_per_objfile->objfile));
23552 return build_error_marker_type (cu, die);
23555 /* If we already know the type we're done. */
23556 if (sig_type->type != NULL)
23557 return sig_type->type;
23560 type_die = follow_die_sig_1 (die, sig_type, &type_cu);
23561 if (type_die != NULL)
23563 /* N.B. We need to call get_die_type to ensure only one type for this DIE
23564 is created. This is important, for example, because for c++ classes
23565 we need TYPE_NAME set which is only done by new_symbol. Blech. */
23566 type = read_type_die (type_die, type_cu);
23569 complaint (_("Dwarf Error: Cannot build signatured type %s"
23570 " referenced from DIE at %s [in module %s]"),
23571 hex_string (signature), sect_offset_str (die->sect_off),
23572 objfile_name (dwarf2_per_objfile->objfile));
23573 type = build_error_marker_type (cu, die);
23578 complaint (_("Dwarf Error: Problem reading signatured DIE %s referenced"
23579 " from DIE at %s [in module %s]"),
23580 hex_string (signature), sect_offset_str (die->sect_off),
23581 objfile_name (dwarf2_per_objfile->objfile));
23582 type = build_error_marker_type (cu, die);
23584 sig_type->type = type;
23589 /* Get the type specified by the DW_AT_signature ATTR in DIE/CU,
23590 reading in and processing the type unit if necessary. */
23592 static struct type *
23593 get_DW_AT_signature_type (struct die_info *die, const struct attribute *attr,
23594 struct dwarf2_cu *cu) /* ARI: editCase function */
23596 /* Yes, DW_AT_signature can use a non-ref_sig8 reference. */
23597 if (attr_form_is_ref (attr))
23599 struct dwarf2_cu *type_cu = cu;
23600 struct die_info *type_die = follow_die_ref (die, attr, &type_cu);
23602 return read_type_die (type_die, type_cu);
23604 else if (attr->form == DW_FORM_ref_sig8)
23606 return get_signatured_type (die, DW_SIGNATURE (attr), cu);
23610 struct dwarf2_per_objfile *dwarf2_per_objfile
23611 = cu->per_cu->dwarf2_per_objfile;
23613 complaint (_("Dwarf Error: DW_AT_signature has bad form %s in DIE"
23614 " at %s [in module %s]"),
23615 dwarf_form_name (attr->form), sect_offset_str (die->sect_off),
23616 objfile_name (dwarf2_per_objfile->objfile));
23617 return build_error_marker_type (cu, die);
23621 /* Load the DIEs associated with type unit PER_CU into memory. */
23624 load_full_type_unit (struct dwarf2_per_cu_data *per_cu)
23626 struct signatured_type *sig_type;
23628 /* Caller is responsible for ensuring type_unit_groups don't get here. */
23629 gdb_assert (! IS_TYPE_UNIT_GROUP (per_cu));
23631 /* We have the per_cu, but we need the signatured_type.
23632 Fortunately this is an easy translation. */
23633 gdb_assert (per_cu->is_debug_types);
23634 sig_type = (struct signatured_type *) per_cu;
23636 gdb_assert (per_cu->cu == NULL);
23638 read_signatured_type (sig_type);
23640 gdb_assert (per_cu->cu != NULL);
23643 /* die_reader_func for read_signatured_type.
23644 This is identical to load_full_comp_unit_reader,
23645 but is kept separate for now. */
23648 read_signatured_type_reader (const struct die_reader_specs *reader,
23649 const gdb_byte *info_ptr,
23650 struct die_info *comp_unit_die,
23654 struct dwarf2_cu *cu = reader->cu;
23656 gdb_assert (cu->die_hash == NULL);
23658 htab_create_alloc_ex (cu->header.length / 12,
23662 &cu->comp_unit_obstack,
23663 hashtab_obstack_allocate,
23664 dummy_obstack_deallocate);
23667 comp_unit_die->child = read_die_and_siblings (reader, info_ptr,
23668 &info_ptr, comp_unit_die);
23669 cu->dies = comp_unit_die;
23670 /* comp_unit_die is not stored in die_hash, no need. */
23672 /* We try not to read any attributes in this function, because not
23673 all CUs needed for references have been loaded yet, and symbol
23674 table processing isn't initialized. But we have to set the CU language,
23675 or we won't be able to build types correctly.
23676 Similarly, if we do not read the producer, we can not apply
23677 producer-specific interpretation. */
23678 prepare_one_comp_unit (cu, cu->dies, language_minimal);
23681 /* Read in a signatured type and build its CU and DIEs.
23682 If the type is a stub for the real type in a DWO file,
23683 read in the real type from the DWO file as well. */
23686 read_signatured_type (struct signatured_type *sig_type)
23688 struct dwarf2_per_cu_data *per_cu = &sig_type->per_cu;
23690 gdb_assert (per_cu->is_debug_types);
23691 gdb_assert (per_cu->cu == NULL);
23693 init_cutu_and_read_dies (per_cu, NULL, 0, 1, false,
23694 read_signatured_type_reader, NULL);
23695 sig_type->per_cu.tu_read = 1;
23698 /* Decode simple location descriptions.
23699 Given a pointer to a dwarf block that defines a location, compute
23700 the location and return the value.
23702 NOTE drow/2003-11-18: This function is called in two situations
23703 now: for the address of static or global variables (partial symbols
23704 only) and for offsets into structures which are expected to be
23705 (more or less) constant. The partial symbol case should go away,
23706 and only the constant case should remain. That will let this
23707 function complain more accurately. A few special modes are allowed
23708 without complaint for global variables (for instance, global
23709 register values and thread-local values).
23711 A location description containing no operations indicates that the
23712 object is optimized out. The return value is 0 for that case.
23713 FIXME drow/2003-11-16: No callers check for this case any more; soon all
23714 callers will only want a very basic result and this can become a
23717 Note that stack[0] is unused except as a default error return. */
23720 decode_locdesc (struct dwarf_block *blk, struct dwarf2_cu *cu)
23722 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
23724 size_t size = blk->size;
23725 const gdb_byte *data = blk->data;
23726 CORE_ADDR stack[64];
23728 unsigned int bytes_read, unsnd;
23734 stack[++stacki] = 0;
23773 stack[++stacki] = op - DW_OP_lit0;
23808 stack[++stacki] = op - DW_OP_reg0;
23810 dwarf2_complex_location_expr_complaint ();
23814 unsnd = read_unsigned_leb128 (NULL, (data + i), &bytes_read);
23816 stack[++stacki] = unsnd;
23818 dwarf2_complex_location_expr_complaint ();
23822 stack[++stacki] = read_address (objfile->obfd, &data[i],
23827 case DW_OP_const1u:
23828 stack[++stacki] = read_1_byte (objfile->obfd, &data[i]);
23832 case DW_OP_const1s:
23833 stack[++stacki] = read_1_signed_byte (objfile->obfd, &data[i]);
23837 case DW_OP_const2u:
23838 stack[++stacki] = read_2_bytes (objfile->obfd, &data[i]);
23842 case DW_OP_const2s:
23843 stack[++stacki] = read_2_signed_bytes (objfile->obfd, &data[i]);
23847 case DW_OP_const4u:
23848 stack[++stacki] = read_4_bytes (objfile->obfd, &data[i]);
23852 case DW_OP_const4s:
23853 stack[++stacki] = read_4_signed_bytes (objfile->obfd, &data[i]);
23857 case DW_OP_const8u:
23858 stack[++stacki] = read_8_bytes (objfile->obfd, &data[i]);
23863 stack[++stacki] = read_unsigned_leb128 (NULL, (data + i),
23869 stack[++stacki] = read_signed_leb128 (NULL, (data + i), &bytes_read);
23874 stack[stacki + 1] = stack[stacki];
23879 stack[stacki - 1] += stack[stacki];
23883 case DW_OP_plus_uconst:
23884 stack[stacki] += read_unsigned_leb128 (NULL, (data + i),
23890 stack[stacki - 1] -= stack[stacki];
23895 /* If we're not the last op, then we definitely can't encode
23896 this using GDB's address_class enum. This is valid for partial
23897 global symbols, although the variable's address will be bogus
23900 dwarf2_complex_location_expr_complaint ();
23903 case DW_OP_GNU_push_tls_address:
23904 case DW_OP_form_tls_address:
23905 /* The top of the stack has the offset from the beginning
23906 of the thread control block at which the variable is located. */
23907 /* Nothing should follow this operator, so the top of stack would
23909 /* This is valid for partial global symbols, but the variable's
23910 address will be bogus in the psymtab. Make it always at least
23911 non-zero to not look as a variable garbage collected by linker
23912 which have DW_OP_addr 0. */
23914 dwarf2_complex_location_expr_complaint ();
23918 case DW_OP_GNU_uninit:
23922 case DW_OP_GNU_addr_index:
23923 case DW_OP_GNU_const_index:
23924 stack[++stacki] = read_addr_index_from_leb128 (cu, &data[i],
23931 const char *name = get_DW_OP_name (op);
23934 complaint (_("unsupported stack op: '%s'"),
23937 complaint (_("unsupported stack op: '%02x'"),
23941 return (stack[stacki]);
23944 /* Enforce maximum stack depth of SIZE-1 to avoid writing
23945 outside of the allocated space. Also enforce minimum>0. */
23946 if (stacki >= ARRAY_SIZE (stack) - 1)
23948 complaint (_("location description stack overflow"));
23954 complaint (_("location description stack underflow"));
23958 return (stack[stacki]);
23961 /* memory allocation interface */
23963 static struct dwarf_block *
23964 dwarf_alloc_block (struct dwarf2_cu *cu)
23966 return XOBNEW (&cu->comp_unit_obstack, struct dwarf_block);
23969 static struct die_info *
23970 dwarf_alloc_die (struct dwarf2_cu *cu, int num_attrs)
23972 struct die_info *die;
23973 size_t size = sizeof (struct die_info);
23976 size += (num_attrs - 1) * sizeof (struct attribute);
23978 die = (struct die_info *) obstack_alloc (&cu->comp_unit_obstack, size);
23979 memset (die, 0, sizeof (struct die_info));
23984 /* Macro support. */
23986 /* Return file name relative to the compilation directory of file number I in
23987 *LH's file name table. The result is allocated using xmalloc; the caller is
23988 responsible for freeing it. */
23991 file_file_name (int file, struct line_header *lh)
23993 /* Is the file number a valid index into the line header's file name
23994 table? Remember that file numbers start with one, not zero. */
23995 if (1 <= file && file <= lh->file_names.size ())
23997 const file_entry &fe = lh->file_names[file - 1];
23999 if (!IS_ABSOLUTE_PATH (fe.name))
24001 const char *dir = fe.include_dir (lh);
24003 return concat (dir, SLASH_STRING, fe.name, (char *) NULL);
24005 return xstrdup (fe.name);
24009 /* The compiler produced a bogus file number. We can at least
24010 record the macro definitions made in the file, even if we
24011 won't be able to find the file by name. */
24012 char fake_name[80];
24014 xsnprintf (fake_name, sizeof (fake_name),
24015 "<bad macro file number %d>", file);
24017 complaint (_("bad file number in macro information (%d)"),
24020 return xstrdup (fake_name);
24024 /* Return the full name of file number I in *LH's file name table.
24025 Use COMP_DIR as the name of the current directory of the
24026 compilation. The result is allocated using xmalloc; the caller is
24027 responsible for freeing it. */
24029 file_full_name (int file, struct line_header *lh, const char *comp_dir)
24031 /* Is the file number a valid index into the line header's file name
24032 table? Remember that file numbers start with one, not zero. */
24033 if (1 <= file && file <= lh->file_names.size ())
24035 char *relative = file_file_name (file, lh);
24037 if (IS_ABSOLUTE_PATH (relative) || comp_dir == NULL)
24039 return reconcat (relative, comp_dir, SLASH_STRING,
24040 relative, (char *) NULL);
24043 return file_file_name (file, lh);
24047 static struct macro_source_file *
24048 macro_start_file (struct dwarf2_cu *cu,
24049 int file, int line,
24050 struct macro_source_file *current_file,
24051 struct line_header *lh)
24053 /* File name relative to the compilation directory of this source file. */
24054 char *file_name = file_file_name (file, lh);
24056 if (! current_file)
24058 /* Note: We don't create a macro table for this compilation unit
24059 at all until we actually get a filename. */
24060 struct macro_table *macro_table = cu->get_builder ()->get_macro_table ();
24062 /* If we have no current file, then this must be the start_file
24063 directive for the compilation unit's main source file. */
24064 current_file = macro_set_main (macro_table, file_name);
24065 macro_define_special (macro_table);
24068 current_file = macro_include (current_file, line, file_name);
24072 return current_file;
24075 static const char *
24076 consume_improper_spaces (const char *p, const char *body)
24080 complaint (_("macro definition contains spaces "
24081 "in formal argument list:\n`%s'"),
24093 parse_macro_definition (struct macro_source_file *file, int line,
24098 /* The body string takes one of two forms. For object-like macro
24099 definitions, it should be:
24101 <macro name> " " <definition>
24103 For function-like macro definitions, it should be:
24105 <macro name> "() " <definition>
24107 <macro name> "(" <arg name> ( "," <arg name> ) * ") " <definition>
24109 Spaces may appear only where explicitly indicated, and in the
24112 The Dwarf 2 spec says that an object-like macro's name is always
24113 followed by a space, but versions of GCC around March 2002 omit
24114 the space when the macro's definition is the empty string.
24116 The Dwarf 2 spec says that there should be no spaces between the
24117 formal arguments in a function-like macro's formal argument list,
24118 but versions of GCC around March 2002 include spaces after the
24122 /* Find the extent of the macro name. The macro name is terminated
24123 by either a space or null character (for an object-like macro) or
24124 an opening paren (for a function-like macro). */
24125 for (p = body; *p; p++)
24126 if (*p == ' ' || *p == '(')
24129 if (*p == ' ' || *p == '\0')
24131 /* It's an object-like macro. */
24132 int name_len = p - body;
24133 char *name = savestring (body, name_len);
24134 const char *replacement;
24137 replacement = body + name_len + 1;
24140 dwarf2_macro_malformed_definition_complaint (body);
24141 replacement = body + name_len;
24144 macro_define_object (file, line, name, replacement);
24148 else if (*p == '(')
24150 /* It's a function-like macro. */
24151 char *name = savestring (body, p - body);
24154 char **argv = XNEWVEC (char *, argv_size);
24158 p = consume_improper_spaces (p, body);
24160 /* Parse the formal argument list. */
24161 while (*p && *p != ')')
24163 /* Find the extent of the current argument name. */
24164 const char *arg_start = p;
24166 while (*p && *p != ',' && *p != ')' && *p != ' ')
24169 if (! *p || p == arg_start)
24170 dwarf2_macro_malformed_definition_complaint (body);
24173 /* Make sure argv has room for the new argument. */
24174 if (argc >= argv_size)
24177 argv = XRESIZEVEC (char *, argv, argv_size);
24180 argv[argc++] = savestring (arg_start, p - arg_start);
24183 p = consume_improper_spaces (p, body);
24185 /* Consume the comma, if present. */
24190 p = consume_improper_spaces (p, body);
24199 /* Perfectly formed definition, no complaints. */
24200 macro_define_function (file, line, name,
24201 argc, (const char **) argv,
24203 else if (*p == '\0')
24205 /* Complain, but do define it. */
24206 dwarf2_macro_malformed_definition_complaint (body);
24207 macro_define_function (file, line, name,
24208 argc, (const char **) argv,
24212 /* Just complain. */
24213 dwarf2_macro_malformed_definition_complaint (body);
24216 /* Just complain. */
24217 dwarf2_macro_malformed_definition_complaint (body);
24223 for (i = 0; i < argc; i++)
24229 dwarf2_macro_malformed_definition_complaint (body);
24232 /* Skip some bytes from BYTES according to the form given in FORM.
24233 Returns the new pointer. */
24235 static const gdb_byte *
24236 skip_form_bytes (bfd *abfd, const gdb_byte *bytes, const gdb_byte *buffer_end,
24237 enum dwarf_form form,
24238 unsigned int offset_size,
24239 struct dwarf2_section_info *section)
24241 unsigned int bytes_read;
24245 case DW_FORM_data1:
24250 case DW_FORM_data2:
24254 case DW_FORM_data4:
24258 case DW_FORM_data8:
24262 case DW_FORM_data16:
24266 case DW_FORM_string:
24267 read_direct_string (abfd, bytes, &bytes_read);
24268 bytes += bytes_read;
24271 case DW_FORM_sec_offset:
24273 case DW_FORM_GNU_strp_alt:
24274 bytes += offset_size;
24277 case DW_FORM_block:
24278 bytes += read_unsigned_leb128 (abfd, bytes, &bytes_read);
24279 bytes += bytes_read;
24282 case DW_FORM_block1:
24283 bytes += 1 + read_1_byte (abfd, bytes);
24285 case DW_FORM_block2:
24286 bytes += 2 + read_2_bytes (abfd, bytes);
24288 case DW_FORM_block4:
24289 bytes += 4 + read_4_bytes (abfd, bytes);
24292 case DW_FORM_addrx:
24293 case DW_FORM_sdata:
24295 case DW_FORM_udata:
24296 case DW_FORM_GNU_addr_index:
24297 case DW_FORM_GNU_str_index:
24298 bytes = gdb_skip_leb128 (bytes, buffer_end);
24301 dwarf2_section_buffer_overflow_complaint (section);
24306 case DW_FORM_implicit_const:
24311 complaint (_("invalid form 0x%x in `%s'"),
24312 form, get_section_name (section));
24320 /* A helper for dwarf_decode_macros that handles skipping an unknown
24321 opcode. Returns an updated pointer to the macro data buffer; or,
24322 on error, issues a complaint and returns NULL. */
24324 static const gdb_byte *
24325 skip_unknown_opcode (unsigned int opcode,
24326 const gdb_byte **opcode_definitions,
24327 const gdb_byte *mac_ptr, const gdb_byte *mac_end,
24329 unsigned int offset_size,
24330 struct dwarf2_section_info *section)
24332 unsigned int bytes_read, i;
24334 const gdb_byte *defn;
24336 if (opcode_definitions[opcode] == NULL)
24338 complaint (_("unrecognized DW_MACFINO opcode 0x%x"),
24343 defn = opcode_definitions[opcode];
24344 arg = read_unsigned_leb128 (abfd, defn, &bytes_read);
24345 defn += bytes_read;
24347 for (i = 0; i < arg; ++i)
24349 mac_ptr = skip_form_bytes (abfd, mac_ptr, mac_end,
24350 (enum dwarf_form) defn[i], offset_size,
24352 if (mac_ptr == NULL)
24354 /* skip_form_bytes already issued the complaint. */
24362 /* A helper function which parses the header of a macro section.
24363 If the macro section is the extended (for now called "GNU") type,
24364 then this updates *OFFSET_SIZE. Returns a pointer to just after
24365 the header, or issues a complaint and returns NULL on error. */
24367 static const gdb_byte *
24368 dwarf_parse_macro_header (const gdb_byte **opcode_definitions,
24370 const gdb_byte *mac_ptr,
24371 unsigned int *offset_size,
24372 int section_is_gnu)
24374 memset (opcode_definitions, 0, 256 * sizeof (gdb_byte *));
24376 if (section_is_gnu)
24378 unsigned int version, flags;
24380 version = read_2_bytes (abfd, mac_ptr);
24381 if (version != 4 && version != 5)
24383 complaint (_("unrecognized version `%d' in .debug_macro section"),
24389 flags = read_1_byte (abfd, mac_ptr);
24391 *offset_size = (flags & 1) ? 8 : 4;
24393 if ((flags & 2) != 0)
24394 /* We don't need the line table offset. */
24395 mac_ptr += *offset_size;
24397 /* Vendor opcode descriptions. */
24398 if ((flags & 4) != 0)
24400 unsigned int i, count;
24402 count = read_1_byte (abfd, mac_ptr);
24404 for (i = 0; i < count; ++i)
24406 unsigned int opcode, bytes_read;
24409 opcode = read_1_byte (abfd, mac_ptr);
24411 opcode_definitions[opcode] = mac_ptr;
24412 arg = read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
24413 mac_ptr += bytes_read;
24422 /* A helper for dwarf_decode_macros that handles the GNU extensions,
24423 including DW_MACRO_import. */
24426 dwarf_decode_macro_bytes (struct dwarf2_cu *cu,
24428 const gdb_byte *mac_ptr, const gdb_byte *mac_end,
24429 struct macro_source_file *current_file,
24430 struct line_header *lh,
24431 struct dwarf2_section_info *section,
24432 int section_is_gnu, int section_is_dwz,
24433 unsigned int offset_size,
24434 htab_t include_hash)
24436 struct dwarf2_per_objfile *dwarf2_per_objfile
24437 = cu->per_cu->dwarf2_per_objfile;
24438 struct objfile *objfile = dwarf2_per_objfile->objfile;
24439 enum dwarf_macro_record_type macinfo_type;
24440 int at_commandline;
24441 const gdb_byte *opcode_definitions[256];
24443 mac_ptr = dwarf_parse_macro_header (opcode_definitions, abfd, mac_ptr,
24444 &offset_size, section_is_gnu);
24445 if (mac_ptr == NULL)
24447 /* We already issued a complaint. */
24451 /* Determines if GDB is still before first DW_MACINFO_start_file. If true
24452 GDB is still reading the definitions from command line. First
24453 DW_MACINFO_start_file will need to be ignored as it was already executed
24454 to create CURRENT_FILE for the main source holding also the command line
24455 definitions. On first met DW_MACINFO_start_file this flag is reset to
24456 normally execute all the remaining DW_MACINFO_start_file macinfos. */
24458 at_commandline = 1;
24462 /* Do we at least have room for a macinfo type byte? */
24463 if (mac_ptr >= mac_end)
24465 dwarf2_section_buffer_overflow_complaint (section);
24469 macinfo_type = (enum dwarf_macro_record_type) read_1_byte (abfd, mac_ptr);
24472 /* Note that we rely on the fact that the corresponding GNU and
24473 DWARF constants are the same. */
24475 DIAGNOSTIC_IGNORE_SWITCH_DIFFERENT_ENUM_TYPES
24476 switch (macinfo_type)
24478 /* A zero macinfo type indicates the end of the macro
24483 case DW_MACRO_define:
24484 case DW_MACRO_undef:
24485 case DW_MACRO_define_strp:
24486 case DW_MACRO_undef_strp:
24487 case DW_MACRO_define_sup:
24488 case DW_MACRO_undef_sup:
24490 unsigned int bytes_read;
24495 line = read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
24496 mac_ptr += bytes_read;
24498 if (macinfo_type == DW_MACRO_define
24499 || macinfo_type == DW_MACRO_undef)
24501 body = read_direct_string (abfd, mac_ptr, &bytes_read);
24502 mac_ptr += bytes_read;
24506 LONGEST str_offset;
24508 str_offset = read_offset_1 (abfd, mac_ptr, offset_size);
24509 mac_ptr += offset_size;
24511 if (macinfo_type == DW_MACRO_define_sup
24512 || macinfo_type == DW_MACRO_undef_sup
24515 struct dwz_file *dwz
24516 = dwarf2_get_dwz_file (dwarf2_per_objfile);
24518 body = read_indirect_string_from_dwz (objfile,
24522 body = read_indirect_string_at_offset (dwarf2_per_objfile,
24526 is_define = (macinfo_type == DW_MACRO_define
24527 || macinfo_type == DW_MACRO_define_strp
24528 || macinfo_type == DW_MACRO_define_sup);
24529 if (! current_file)
24531 /* DWARF violation as no main source is present. */
24532 complaint (_("debug info with no main source gives macro %s "
24534 is_define ? _("definition") : _("undefinition"),
24538 if ((line == 0 && !at_commandline)
24539 || (line != 0 && at_commandline))
24540 complaint (_("debug info gives %s macro %s with %s line %d: %s"),
24541 at_commandline ? _("command-line") : _("in-file"),
24542 is_define ? _("definition") : _("undefinition"),
24543 line == 0 ? _("zero") : _("non-zero"), line, body);
24546 parse_macro_definition (current_file, line, body);
24549 gdb_assert (macinfo_type == DW_MACRO_undef
24550 || macinfo_type == DW_MACRO_undef_strp
24551 || macinfo_type == DW_MACRO_undef_sup);
24552 macro_undef (current_file, line, body);
24557 case DW_MACRO_start_file:
24559 unsigned int bytes_read;
24562 line = read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
24563 mac_ptr += bytes_read;
24564 file = read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
24565 mac_ptr += bytes_read;
24567 if ((line == 0 && !at_commandline)
24568 || (line != 0 && at_commandline))
24569 complaint (_("debug info gives source %d included "
24570 "from %s at %s line %d"),
24571 file, at_commandline ? _("command-line") : _("file"),
24572 line == 0 ? _("zero") : _("non-zero"), line);
24574 if (at_commandline)
24576 /* This DW_MACRO_start_file was executed in the
24578 at_commandline = 0;
24581 current_file = macro_start_file (cu, file, line, current_file,
24586 case DW_MACRO_end_file:
24587 if (! current_file)
24588 complaint (_("macro debug info has an unmatched "
24589 "`close_file' directive"));
24592 current_file = current_file->included_by;
24593 if (! current_file)
24595 enum dwarf_macro_record_type next_type;
24597 /* GCC circa March 2002 doesn't produce the zero
24598 type byte marking the end of the compilation
24599 unit. Complain if it's not there, but exit no
24602 /* Do we at least have room for a macinfo type byte? */
24603 if (mac_ptr >= mac_end)
24605 dwarf2_section_buffer_overflow_complaint (section);
24609 /* We don't increment mac_ptr here, so this is just
24612 = (enum dwarf_macro_record_type) read_1_byte (abfd,
24614 if (next_type != 0)
24615 complaint (_("no terminating 0-type entry for "
24616 "macros in `.debug_macinfo' section"));
24623 case DW_MACRO_import:
24624 case DW_MACRO_import_sup:
24628 bfd *include_bfd = abfd;
24629 struct dwarf2_section_info *include_section = section;
24630 const gdb_byte *include_mac_end = mac_end;
24631 int is_dwz = section_is_dwz;
24632 const gdb_byte *new_mac_ptr;
24634 offset = read_offset_1 (abfd, mac_ptr, offset_size);
24635 mac_ptr += offset_size;
24637 if (macinfo_type == DW_MACRO_import_sup)
24639 struct dwz_file *dwz = dwarf2_get_dwz_file (dwarf2_per_objfile);
24641 dwarf2_read_section (objfile, &dwz->macro);
24643 include_section = &dwz->macro;
24644 include_bfd = get_section_bfd_owner (include_section);
24645 include_mac_end = dwz->macro.buffer + dwz->macro.size;
24649 new_mac_ptr = include_section->buffer + offset;
24650 slot = htab_find_slot (include_hash, new_mac_ptr, INSERT);
24654 /* This has actually happened; see
24655 http://sourceware.org/bugzilla/show_bug.cgi?id=13568. */
24656 complaint (_("recursive DW_MACRO_import in "
24657 ".debug_macro section"));
24661 *slot = (void *) new_mac_ptr;
24663 dwarf_decode_macro_bytes (cu, include_bfd, new_mac_ptr,
24664 include_mac_end, current_file, lh,
24665 section, section_is_gnu, is_dwz,
24666 offset_size, include_hash);
24668 htab_remove_elt (include_hash, (void *) new_mac_ptr);
24673 case DW_MACINFO_vendor_ext:
24674 if (!section_is_gnu)
24676 unsigned int bytes_read;
24678 /* This reads the constant, but since we don't recognize
24679 any vendor extensions, we ignore it. */
24680 read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
24681 mac_ptr += bytes_read;
24682 read_direct_string (abfd, mac_ptr, &bytes_read);
24683 mac_ptr += bytes_read;
24685 /* We don't recognize any vendor extensions. */
24691 mac_ptr = skip_unknown_opcode (macinfo_type, opcode_definitions,
24692 mac_ptr, mac_end, abfd, offset_size,
24694 if (mac_ptr == NULL)
24699 } while (macinfo_type != 0);
24703 dwarf_decode_macros (struct dwarf2_cu *cu, unsigned int offset,
24704 int section_is_gnu)
24706 struct dwarf2_per_objfile *dwarf2_per_objfile
24707 = cu->per_cu->dwarf2_per_objfile;
24708 struct objfile *objfile = dwarf2_per_objfile->objfile;
24709 struct line_header *lh = cu->line_header;
24711 const gdb_byte *mac_ptr, *mac_end;
24712 struct macro_source_file *current_file = 0;
24713 enum dwarf_macro_record_type macinfo_type;
24714 unsigned int offset_size = cu->header.offset_size;
24715 const gdb_byte *opcode_definitions[256];
24717 struct dwarf2_section_info *section;
24718 const char *section_name;
24720 if (cu->dwo_unit != NULL)
24722 if (section_is_gnu)
24724 section = &cu->dwo_unit->dwo_file->sections.macro;
24725 section_name = ".debug_macro.dwo";
24729 section = &cu->dwo_unit->dwo_file->sections.macinfo;
24730 section_name = ".debug_macinfo.dwo";
24735 if (section_is_gnu)
24737 section = &dwarf2_per_objfile->macro;
24738 section_name = ".debug_macro";
24742 section = &dwarf2_per_objfile->macinfo;
24743 section_name = ".debug_macinfo";
24747 dwarf2_read_section (objfile, section);
24748 if (section->buffer == NULL)
24750 complaint (_("missing %s section"), section_name);
24753 abfd = get_section_bfd_owner (section);
24755 /* First pass: Find the name of the base filename.
24756 This filename is needed in order to process all macros whose definition
24757 (or undefinition) comes from the command line. These macros are defined
24758 before the first DW_MACINFO_start_file entry, and yet still need to be
24759 associated to the base file.
24761 To determine the base file name, we scan the macro definitions until we
24762 reach the first DW_MACINFO_start_file entry. We then initialize
24763 CURRENT_FILE accordingly so that any macro definition found before the
24764 first DW_MACINFO_start_file can still be associated to the base file. */
24766 mac_ptr = section->buffer + offset;
24767 mac_end = section->buffer + section->size;
24769 mac_ptr = dwarf_parse_macro_header (opcode_definitions, abfd, mac_ptr,
24770 &offset_size, section_is_gnu);
24771 if (mac_ptr == NULL)
24773 /* We already issued a complaint. */
24779 /* Do we at least have room for a macinfo type byte? */
24780 if (mac_ptr >= mac_end)
24782 /* Complaint is printed during the second pass as GDB will probably
24783 stop the first pass earlier upon finding
24784 DW_MACINFO_start_file. */
24788 macinfo_type = (enum dwarf_macro_record_type) read_1_byte (abfd, mac_ptr);
24791 /* Note that we rely on the fact that the corresponding GNU and
24792 DWARF constants are the same. */
24794 DIAGNOSTIC_IGNORE_SWITCH_DIFFERENT_ENUM_TYPES
24795 switch (macinfo_type)
24797 /* A zero macinfo type indicates the end of the macro
24802 case DW_MACRO_define:
24803 case DW_MACRO_undef:
24804 /* Only skip the data by MAC_PTR. */
24806 unsigned int bytes_read;
24808 read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
24809 mac_ptr += bytes_read;
24810 read_direct_string (abfd, mac_ptr, &bytes_read);
24811 mac_ptr += bytes_read;
24815 case DW_MACRO_start_file:
24817 unsigned int bytes_read;
24820 line = read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
24821 mac_ptr += bytes_read;
24822 file = read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
24823 mac_ptr += bytes_read;
24825 current_file = macro_start_file (cu, file, line, current_file, lh);
24829 case DW_MACRO_end_file:
24830 /* No data to skip by MAC_PTR. */
24833 case DW_MACRO_define_strp:
24834 case DW_MACRO_undef_strp:
24835 case DW_MACRO_define_sup:
24836 case DW_MACRO_undef_sup:
24838 unsigned int bytes_read;
24840 read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
24841 mac_ptr += bytes_read;
24842 mac_ptr += offset_size;
24846 case DW_MACRO_import:
24847 case DW_MACRO_import_sup:
24848 /* Note that, according to the spec, a transparent include
24849 chain cannot call DW_MACRO_start_file. So, we can just
24850 skip this opcode. */
24851 mac_ptr += offset_size;
24854 case DW_MACINFO_vendor_ext:
24855 /* Only skip the data by MAC_PTR. */
24856 if (!section_is_gnu)
24858 unsigned int bytes_read;
24860 read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
24861 mac_ptr += bytes_read;
24862 read_direct_string (abfd, mac_ptr, &bytes_read);
24863 mac_ptr += bytes_read;
24868 mac_ptr = skip_unknown_opcode (macinfo_type, opcode_definitions,
24869 mac_ptr, mac_end, abfd, offset_size,
24871 if (mac_ptr == NULL)
24876 } while (macinfo_type != 0 && current_file == NULL);
24878 /* Second pass: Process all entries.
24880 Use the AT_COMMAND_LINE flag to determine whether we are still processing
24881 command-line macro definitions/undefinitions. This flag is unset when we
24882 reach the first DW_MACINFO_start_file entry. */
24884 htab_up include_hash (htab_create_alloc (1, htab_hash_pointer,
24886 NULL, xcalloc, xfree));
24887 mac_ptr = section->buffer + offset;
24888 slot = htab_find_slot (include_hash.get (), mac_ptr, INSERT);
24889 *slot = (void *) mac_ptr;
24890 dwarf_decode_macro_bytes (cu, abfd, mac_ptr, mac_end,
24891 current_file, lh, section,
24892 section_is_gnu, 0, offset_size,
24893 include_hash.get ());
24896 /* Check if the attribute's form is a DW_FORM_block*
24897 if so return true else false. */
24900 attr_form_is_block (const struct attribute *attr)
24902 return (attr == NULL ? 0 :
24903 attr->form == DW_FORM_block1
24904 || attr->form == DW_FORM_block2
24905 || attr->form == DW_FORM_block4
24906 || attr->form == DW_FORM_block
24907 || attr->form == DW_FORM_exprloc);
24910 /* Return non-zero if ATTR's value is a section offset --- classes
24911 lineptr, loclistptr, macptr or rangelistptr --- or zero, otherwise.
24912 You may use DW_UNSND (attr) to retrieve such offsets.
24914 Section 7.5.4, "Attribute Encodings", explains that no attribute
24915 may have a value that belongs to more than one of these classes; it
24916 would be ambiguous if we did, because we use the same forms for all
24920 attr_form_is_section_offset (const struct attribute *attr)
24922 return (attr->form == DW_FORM_data4
24923 || attr->form == DW_FORM_data8
24924 || attr->form == DW_FORM_sec_offset);
24927 /* Return non-zero if ATTR's value falls in the 'constant' class, or
24928 zero otherwise. When this function returns true, you can apply
24929 dwarf2_get_attr_constant_value to it.
24931 However, note that for some attributes you must check
24932 attr_form_is_section_offset before using this test. DW_FORM_data4
24933 and DW_FORM_data8 are members of both the constant class, and of
24934 the classes that contain offsets into other debug sections
24935 (lineptr, loclistptr, macptr or rangelistptr). The DWARF spec says
24936 that, if an attribute's can be either a constant or one of the
24937 section offset classes, DW_FORM_data4 and DW_FORM_data8 should be
24938 taken as section offsets, not constants.
24940 DW_FORM_data16 is not considered as dwarf2_get_attr_constant_value
24941 cannot handle that. */
24944 attr_form_is_constant (const struct attribute *attr)
24946 switch (attr->form)
24948 case DW_FORM_sdata:
24949 case DW_FORM_udata:
24950 case DW_FORM_data1:
24951 case DW_FORM_data2:
24952 case DW_FORM_data4:
24953 case DW_FORM_data8:
24954 case DW_FORM_implicit_const:
24962 /* DW_ADDR is always stored already as sect_offset; despite for the forms
24963 besides DW_FORM_ref_addr it is stored as cu_offset in the DWARF file. */
24966 attr_form_is_ref (const struct attribute *attr)
24968 switch (attr->form)
24970 case DW_FORM_ref_addr:
24975 case DW_FORM_ref_udata:
24976 case DW_FORM_GNU_ref_alt:
24983 /* Return the .debug_loc section to use for CU.
24984 For DWO files use .debug_loc.dwo. */
24986 static struct dwarf2_section_info *
24987 cu_debug_loc_section (struct dwarf2_cu *cu)
24989 struct dwarf2_per_objfile *dwarf2_per_objfile
24990 = cu->per_cu->dwarf2_per_objfile;
24994 struct dwo_sections *sections = &cu->dwo_unit->dwo_file->sections;
24996 return cu->header.version >= 5 ? §ions->loclists : §ions->loc;
24998 return (cu->header.version >= 5 ? &dwarf2_per_objfile->loclists
24999 : &dwarf2_per_objfile->loc);
25002 /* A helper function that fills in a dwarf2_loclist_baton. */
25005 fill_in_loclist_baton (struct dwarf2_cu *cu,
25006 struct dwarf2_loclist_baton *baton,
25007 const struct attribute *attr)
25009 struct dwarf2_per_objfile *dwarf2_per_objfile
25010 = cu->per_cu->dwarf2_per_objfile;
25011 struct dwarf2_section_info *section = cu_debug_loc_section (cu);
25013 dwarf2_read_section (dwarf2_per_objfile->objfile, section);
25015 baton->per_cu = cu->per_cu;
25016 gdb_assert (baton->per_cu);
25017 /* We don't know how long the location list is, but make sure we
25018 don't run off the edge of the section. */
25019 baton->size = section->size - DW_UNSND (attr);
25020 baton->data = section->buffer + DW_UNSND (attr);
25021 baton->base_address = cu->base_address;
25022 baton->from_dwo = cu->dwo_unit != NULL;
25026 dwarf2_symbol_mark_computed (const struct attribute *attr, struct symbol *sym,
25027 struct dwarf2_cu *cu, int is_block)
25029 struct dwarf2_per_objfile *dwarf2_per_objfile
25030 = cu->per_cu->dwarf2_per_objfile;
25031 struct objfile *objfile = dwarf2_per_objfile->objfile;
25032 struct dwarf2_section_info *section = cu_debug_loc_section (cu);
25034 if (attr_form_is_section_offset (attr)
25035 /* .debug_loc{,.dwo} may not exist at all, or the offset may be outside
25036 the section. If so, fall through to the complaint in the
25038 && DW_UNSND (attr) < dwarf2_section_size (objfile, section))
25040 struct dwarf2_loclist_baton *baton;
25042 baton = XOBNEW (&objfile->objfile_obstack, struct dwarf2_loclist_baton);
25044 fill_in_loclist_baton (cu, baton, attr);
25046 if (cu->base_known == 0)
25047 complaint (_("Location list used without "
25048 "specifying the CU base address."));
25050 SYMBOL_ACLASS_INDEX (sym) = (is_block
25051 ? dwarf2_loclist_block_index
25052 : dwarf2_loclist_index);
25053 SYMBOL_LOCATION_BATON (sym) = baton;
25057 struct dwarf2_locexpr_baton *baton;
25059 baton = XOBNEW (&objfile->objfile_obstack, struct dwarf2_locexpr_baton);
25060 baton->per_cu = cu->per_cu;
25061 gdb_assert (baton->per_cu);
25063 if (attr_form_is_block (attr))
25065 /* Note that we're just copying the block's data pointer
25066 here, not the actual data. We're still pointing into the
25067 info_buffer for SYM's objfile; right now we never release
25068 that buffer, but when we do clean up properly this may
25070 baton->size = DW_BLOCK (attr)->size;
25071 baton->data = DW_BLOCK (attr)->data;
25075 dwarf2_invalid_attrib_class_complaint ("location description",
25076 SYMBOL_NATURAL_NAME (sym));
25080 SYMBOL_ACLASS_INDEX (sym) = (is_block
25081 ? dwarf2_locexpr_block_index
25082 : dwarf2_locexpr_index);
25083 SYMBOL_LOCATION_BATON (sym) = baton;
25087 /* Return the OBJFILE associated with the compilation unit CU. If CU
25088 came from a separate debuginfo file, then the master objfile is
25092 dwarf2_per_cu_objfile (struct dwarf2_per_cu_data *per_cu)
25094 struct objfile *objfile = per_cu->dwarf2_per_objfile->objfile;
25096 /* Return the master objfile, so that we can report and look up the
25097 correct file containing this variable. */
25098 if (objfile->separate_debug_objfile_backlink)
25099 objfile = objfile->separate_debug_objfile_backlink;
25104 /* Return comp_unit_head for PER_CU, either already available in PER_CU->CU
25105 (CU_HEADERP is unused in such case) or prepare a temporary copy at
25106 CU_HEADERP first. */
25108 static const struct comp_unit_head *
25109 per_cu_header_read_in (struct comp_unit_head *cu_headerp,
25110 struct dwarf2_per_cu_data *per_cu)
25112 const gdb_byte *info_ptr;
25115 return &per_cu->cu->header;
25117 info_ptr = per_cu->section->buffer + to_underlying (per_cu->sect_off);
25119 memset (cu_headerp, 0, sizeof (*cu_headerp));
25120 read_comp_unit_head (cu_headerp, info_ptr, per_cu->section,
25121 rcuh_kind::COMPILE);
25126 /* Return the address size given in the compilation unit header for CU. */
25129 dwarf2_per_cu_addr_size (struct dwarf2_per_cu_data *per_cu)
25131 struct comp_unit_head cu_header_local;
25132 const struct comp_unit_head *cu_headerp;
25134 cu_headerp = per_cu_header_read_in (&cu_header_local, per_cu);
25136 return cu_headerp->addr_size;
25139 /* Return the offset size given in the compilation unit header for CU. */
25142 dwarf2_per_cu_offset_size (struct dwarf2_per_cu_data *per_cu)
25144 struct comp_unit_head cu_header_local;
25145 const struct comp_unit_head *cu_headerp;
25147 cu_headerp = per_cu_header_read_in (&cu_header_local, per_cu);
25149 return cu_headerp->offset_size;
25152 /* See its dwarf2loc.h declaration. */
25155 dwarf2_per_cu_ref_addr_size (struct dwarf2_per_cu_data *per_cu)
25157 struct comp_unit_head cu_header_local;
25158 const struct comp_unit_head *cu_headerp;
25160 cu_headerp = per_cu_header_read_in (&cu_header_local, per_cu);
25162 if (cu_headerp->version == 2)
25163 return cu_headerp->addr_size;
25165 return cu_headerp->offset_size;
25168 /* Return the text offset of the CU. The returned offset comes from
25169 this CU's objfile. If this objfile came from a separate debuginfo
25170 file, then the offset may be different from the corresponding
25171 offset in the parent objfile. */
25174 dwarf2_per_cu_text_offset (struct dwarf2_per_cu_data *per_cu)
25176 struct objfile *objfile = per_cu->dwarf2_per_objfile->objfile;
25178 return ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
25181 /* Return DWARF version number of PER_CU. */
25184 dwarf2_version (struct dwarf2_per_cu_data *per_cu)
25186 return per_cu->dwarf_version;
25189 /* Locate the .debug_info compilation unit from CU's objfile which contains
25190 the DIE at OFFSET. Raises an error on failure. */
25192 static struct dwarf2_per_cu_data *
25193 dwarf2_find_containing_comp_unit (sect_offset sect_off,
25194 unsigned int offset_in_dwz,
25195 struct dwarf2_per_objfile *dwarf2_per_objfile)
25197 struct dwarf2_per_cu_data *this_cu;
25201 high = dwarf2_per_objfile->all_comp_units.size () - 1;
25204 struct dwarf2_per_cu_data *mid_cu;
25205 int mid = low + (high - low) / 2;
25207 mid_cu = dwarf2_per_objfile->all_comp_units[mid];
25208 if (mid_cu->is_dwz > offset_in_dwz
25209 || (mid_cu->is_dwz == offset_in_dwz
25210 && mid_cu->sect_off + mid_cu->length >= sect_off))
25215 gdb_assert (low == high);
25216 this_cu = dwarf2_per_objfile->all_comp_units[low];
25217 if (this_cu->is_dwz != offset_in_dwz || this_cu->sect_off > sect_off)
25219 if (low == 0 || this_cu->is_dwz != offset_in_dwz)
25220 error (_("Dwarf Error: could not find partial DIE containing "
25221 "offset %s [in module %s]"),
25222 sect_offset_str (sect_off),
25223 bfd_get_filename (dwarf2_per_objfile->objfile->obfd));
25225 gdb_assert (dwarf2_per_objfile->all_comp_units[low-1]->sect_off
25227 return dwarf2_per_objfile->all_comp_units[low-1];
25231 if (low == dwarf2_per_objfile->all_comp_units.size () - 1
25232 && sect_off >= this_cu->sect_off + this_cu->length)
25233 error (_("invalid dwarf2 offset %s"), sect_offset_str (sect_off));
25234 gdb_assert (sect_off < this_cu->sect_off + this_cu->length);
25239 /* Initialize dwarf2_cu CU, owned by PER_CU. */
25241 dwarf2_cu::dwarf2_cu (struct dwarf2_per_cu_data *per_cu_)
25242 : per_cu (per_cu_),
25244 has_loclist (false),
25245 checked_producer (false),
25246 producer_is_gxx_lt_4_6 (false),
25247 producer_is_gcc_lt_4_3 (false),
25248 producer_is_icc (false),
25249 producer_is_icc_lt_14 (false),
25250 producer_is_codewarrior (false),
25251 processing_has_namespace_info (false)
25256 /* Destroy a dwarf2_cu. */
25258 dwarf2_cu::~dwarf2_cu ()
25263 /* Initialize basic fields of dwarf_cu CU according to DIE COMP_UNIT_DIE. */
25266 prepare_one_comp_unit (struct dwarf2_cu *cu, struct die_info *comp_unit_die,
25267 enum language pretend_language)
25269 struct attribute *attr;
25271 /* Set the language we're debugging. */
25272 attr = dwarf2_attr (comp_unit_die, DW_AT_language, cu);
25274 set_cu_language (DW_UNSND (attr), cu);
25277 cu->language = pretend_language;
25278 cu->language_defn = language_def (cu->language);
25281 cu->producer = dwarf2_string_attr (comp_unit_die, DW_AT_producer, cu);
25284 /* Increase the age counter on each cached compilation unit, and free
25285 any that are too old. */
25288 age_cached_comp_units (struct dwarf2_per_objfile *dwarf2_per_objfile)
25290 struct dwarf2_per_cu_data *per_cu, **last_chain;
25292 dwarf2_clear_marks (dwarf2_per_objfile->read_in_chain);
25293 per_cu = dwarf2_per_objfile->read_in_chain;
25294 while (per_cu != NULL)
25296 per_cu->cu->last_used ++;
25297 if (per_cu->cu->last_used <= dwarf_max_cache_age)
25298 dwarf2_mark (per_cu->cu);
25299 per_cu = per_cu->cu->read_in_chain;
25302 per_cu = dwarf2_per_objfile->read_in_chain;
25303 last_chain = &dwarf2_per_objfile->read_in_chain;
25304 while (per_cu != NULL)
25306 struct dwarf2_per_cu_data *next_cu;
25308 next_cu = per_cu->cu->read_in_chain;
25310 if (!per_cu->cu->mark)
25313 *last_chain = next_cu;
25316 last_chain = &per_cu->cu->read_in_chain;
25322 /* Remove a single compilation unit from the cache. */
25325 free_one_cached_comp_unit (struct dwarf2_per_cu_data *target_per_cu)
25327 struct dwarf2_per_cu_data *per_cu, **last_chain;
25328 struct dwarf2_per_objfile *dwarf2_per_objfile
25329 = target_per_cu->dwarf2_per_objfile;
25331 per_cu = dwarf2_per_objfile->read_in_chain;
25332 last_chain = &dwarf2_per_objfile->read_in_chain;
25333 while (per_cu != NULL)
25335 struct dwarf2_per_cu_data *next_cu;
25337 next_cu = per_cu->cu->read_in_chain;
25339 if (per_cu == target_per_cu)
25343 *last_chain = next_cu;
25347 last_chain = &per_cu->cu->read_in_chain;
25353 /* Cleanup function for the dwarf2_per_objfile data. */
25356 dwarf2_free_objfile (struct objfile *objfile, void *datum)
25358 struct dwarf2_per_objfile *dwarf2_per_objfile
25359 = static_cast<struct dwarf2_per_objfile *> (datum);
25361 delete dwarf2_per_objfile;
25364 /* A set of CU "per_cu" pointer, DIE offset, and GDB type pointer.
25365 We store these in a hash table separate from the DIEs, and preserve them
25366 when the DIEs are flushed out of cache.
25368 The CU "per_cu" pointer is needed because offset alone is not enough to
25369 uniquely identify the type. A file may have multiple .debug_types sections,
25370 or the type may come from a DWO file. Furthermore, while it's more logical
25371 to use per_cu->section+offset, with Fission the section with the data is in
25372 the DWO file but we don't know that section at the point we need it.
25373 We have to use something in dwarf2_per_cu_data (or the pointer to it)
25374 because we can enter the lookup routine, get_die_type_at_offset, from
25375 outside this file, and thus won't necessarily have PER_CU->cu.
25376 Fortunately, PER_CU is stable for the life of the objfile. */
25378 struct dwarf2_per_cu_offset_and_type
25380 const struct dwarf2_per_cu_data *per_cu;
25381 sect_offset sect_off;
25385 /* Hash function for a dwarf2_per_cu_offset_and_type. */
25388 per_cu_offset_and_type_hash (const void *item)
25390 const struct dwarf2_per_cu_offset_and_type *ofs
25391 = (const struct dwarf2_per_cu_offset_and_type *) item;
25393 return (uintptr_t) ofs->per_cu + to_underlying (ofs->sect_off);
25396 /* Equality function for a dwarf2_per_cu_offset_and_type. */
25399 per_cu_offset_and_type_eq (const void *item_lhs, const void *item_rhs)
25401 const struct dwarf2_per_cu_offset_and_type *ofs_lhs
25402 = (const struct dwarf2_per_cu_offset_and_type *) item_lhs;
25403 const struct dwarf2_per_cu_offset_and_type *ofs_rhs
25404 = (const struct dwarf2_per_cu_offset_and_type *) item_rhs;
25406 return (ofs_lhs->per_cu == ofs_rhs->per_cu
25407 && ofs_lhs->sect_off == ofs_rhs->sect_off);
25410 /* Set the type associated with DIE to TYPE. Save it in CU's hash
25411 table if necessary. For convenience, return TYPE.
25413 The DIEs reading must have careful ordering to:
25414 * Not cause infite loops trying to read in DIEs as a prerequisite for
25415 reading current DIE.
25416 * Not trying to dereference contents of still incompletely read in types
25417 while reading in other DIEs.
25418 * Enable referencing still incompletely read in types just by a pointer to
25419 the type without accessing its fields.
25421 Therefore caller should follow these rules:
25422 * Try to fetch any prerequisite types we may need to build this DIE type
25423 before building the type and calling set_die_type.
25424 * After building type call set_die_type for current DIE as soon as
25425 possible before fetching more types to complete the current type.
25426 * Make the type as complete as possible before fetching more types. */
25428 static struct type *
25429 set_die_type (struct die_info *die, struct type *type, struct dwarf2_cu *cu)
25431 struct dwarf2_per_objfile *dwarf2_per_objfile
25432 = cu->per_cu->dwarf2_per_objfile;
25433 struct dwarf2_per_cu_offset_and_type **slot, ofs;
25434 struct objfile *objfile = dwarf2_per_objfile->objfile;
25435 struct attribute *attr;
25436 struct dynamic_prop prop;
25438 /* For Ada types, make sure that the gnat-specific data is always
25439 initialized (if not already set). There are a few types where
25440 we should not be doing so, because the type-specific area is
25441 already used to hold some other piece of info (eg: TYPE_CODE_FLT
25442 where the type-specific area is used to store the floatformat).
25443 But this is not a problem, because the gnat-specific information
25444 is actually not needed for these types. */
25445 if (need_gnat_info (cu)
25446 && TYPE_CODE (type) != TYPE_CODE_FUNC
25447 && TYPE_CODE (type) != TYPE_CODE_FLT
25448 && TYPE_CODE (type) != TYPE_CODE_METHODPTR
25449 && TYPE_CODE (type) != TYPE_CODE_MEMBERPTR
25450 && TYPE_CODE (type) != TYPE_CODE_METHOD
25451 && !HAVE_GNAT_AUX_INFO (type))
25452 INIT_GNAT_SPECIFIC (type);
25454 /* Read DW_AT_allocated and set in type. */
25455 attr = dwarf2_attr (die, DW_AT_allocated, cu);
25456 if (attr_form_is_block (attr))
25458 if (attr_to_dynamic_prop (attr, die, cu, &prop))
25459 add_dyn_prop (DYN_PROP_ALLOCATED, prop, type);
25461 else if (attr != NULL)
25463 complaint (_("DW_AT_allocated has the wrong form (%s) at DIE %s"),
25464 (attr != NULL ? dwarf_form_name (attr->form) : "n/a"),
25465 sect_offset_str (die->sect_off));
25468 /* Read DW_AT_associated and set in type. */
25469 attr = dwarf2_attr (die, DW_AT_associated, cu);
25470 if (attr_form_is_block (attr))
25472 if (attr_to_dynamic_prop (attr, die, cu, &prop))
25473 add_dyn_prop (DYN_PROP_ASSOCIATED, prop, type);
25475 else if (attr != NULL)
25477 complaint (_("DW_AT_associated has the wrong form (%s) at DIE %s"),
25478 (attr != NULL ? dwarf_form_name (attr->form) : "n/a"),
25479 sect_offset_str (die->sect_off));
25482 /* Read DW_AT_data_location and set in type. */
25483 attr = dwarf2_attr (die, DW_AT_data_location, cu);
25484 if (attr_to_dynamic_prop (attr, die, cu, &prop))
25485 add_dyn_prop (DYN_PROP_DATA_LOCATION, prop, type);
25487 if (dwarf2_per_objfile->die_type_hash == NULL)
25489 dwarf2_per_objfile->die_type_hash =
25490 htab_create_alloc_ex (127,
25491 per_cu_offset_and_type_hash,
25492 per_cu_offset_and_type_eq,
25494 &objfile->objfile_obstack,
25495 hashtab_obstack_allocate,
25496 dummy_obstack_deallocate);
25499 ofs.per_cu = cu->per_cu;
25500 ofs.sect_off = die->sect_off;
25502 slot = (struct dwarf2_per_cu_offset_and_type **)
25503 htab_find_slot (dwarf2_per_objfile->die_type_hash, &ofs, INSERT);
25505 complaint (_("A problem internal to GDB: DIE %s has type already set"),
25506 sect_offset_str (die->sect_off));
25507 *slot = XOBNEW (&objfile->objfile_obstack,
25508 struct dwarf2_per_cu_offset_and_type);
25513 /* Look up the type for the die at SECT_OFF in PER_CU in die_type_hash,
25514 or return NULL if the die does not have a saved type. */
25516 static struct type *
25517 get_die_type_at_offset (sect_offset sect_off,
25518 struct dwarf2_per_cu_data *per_cu)
25520 struct dwarf2_per_cu_offset_and_type *slot, ofs;
25521 struct dwarf2_per_objfile *dwarf2_per_objfile = per_cu->dwarf2_per_objfile;
25523 if (dwarf2_per_objfile->die_type_hash == NULL)
25526 ofs.per_cu = per_cu;
25527 ofs.sect_off = sect_off;
25528 slot = ((struct dwarf2_per_cu_offset_and_type *)
25529 htab_find (dwarf2_per_objfile->die_type_hash, &ofs));
25536 /* Look up the type for DIE in CU in die_type_hash,
25537 or return NULL if DIE does not have a saved type. */
25539 static struct type *
25540 get_die_type (struct die_info *die, struct dwarf2_cu *cu)
25542 return get_die_type_at_offset (die->sect_off, cu->per_cu);
25545 /* Add a dependence relationship from CU to REF_PER_CU. */
25548 dwarf2_add_dependence (struct dwarf2_cu *cu,
25549 struct dwarf2_per_cu_data *ref_per_cu)
25553 if (cu->dependencies == NULL)
25555 = htab_create_alloc_ex (5, htab_hash_pointer, htab_eq_pointer,
25556 NULL, &cu->comp_unit_obstack,
25557 hashtab_obstack_allocate,
25558 dummy_obstack_deallocate);
25560 slot = htab_find_slot (cu->dependencies, ref_per_cu, INSERT);
25562 *slot = ref_per_cu;
25565 /* Subroutine of dwarf2_mark to pass to htab_traverse.
25566 Set the mark field in every compilation unit in the
25567 cache that we must keep because we are keeping CU. */
25570 dwarf2_mark_helper (void **slot, void *data)
25572 struct dwarf2_per_cu_data *per_cu;
25574 per_cu = (struct dwarf2_per_cu_data *) *slot;
25576 /* cu->dependencies references may not yet have been ever read if QUIT aborts
25577 reading of the chain. As such dependencies remain valid it is not much
25578 useful to track and undo them during QUIT cleanups. */
25579 if (per_cu->cu == NULL)
25582 if (per_cu->cu->mark)
25584 per_cu->cu->mark = true;
25586 if (per_cu->cu->dependencies != NULL)
25587 htab_traverse (per_cu->cu->dependencies, dwarf2_mark_helper, NULL);
25592 /* Set the mark field in CU and in every other compilation unit in the
25593 cache that we must keep because we are keeping CU. */
25596 dwarf2_mark (struct dwarf2_cu *cu)
25601 if (cu->dependencies != NULL)
25602 htab_traverse (cu->dependencies, dwarf2_mark_helper, NULL);
25606 dwarf2_clear_marks (struct dwarf2_per_cu_data *per_cu)
25610 per_cu->cu->mark = false;
25611 per_cu = per_cu->cu->read_in_chain;
25615 /* Trivial hash function for partial_die_info: the hash value of a DIE
25616 is its offset in .debug_info for this objfile. */
25619 partial_die_hash (const void *item)
25621 const struct partial_die_info *part_die
25622 = (const struct partial_die_info *) item;
25624 return to_underlying (part_die->sect_off);
25627 /* Trivial comparison function for partial_die_info structures: two DIEs
25628 are equal if they have the same offset. */
25631 partial_die_eq (const void *item_lhs, const void *item_rhs)
25633 const struct partial_die_info *part_die_lhs
25634 = (const struct partial_die_info *) item_lhs;
25635 const struct partial_die_info *part_die_rhs
25636 = (const struct partial_die_info *) item_rhs;
25638 return part_die_lhs->sect_off == part_die_rhs->sect_off;
25641 struct cmd_list_element *set_dwarf_cmdlist;
25642 struct cmd_list_element *show_dwarf_cmdlist;
25645 set_dwarf_cmd (const char *args, int from_tty)
25647 help_list (set_dwarf_cmdlist, "maintenance set dwarf ", all_commands,
25652 show_dwarf_cmd (const char *args, int from_tty)
25654 cmd_show_list (show_dwarf_cmdlist, from_tty, "");
25657 int dwarf_always_disassemble;
25660 show_dwarf_always_disassemble (struct ui_file *file, int from_tty,
25661 struct cmd_list_element *c, const char *value)
25663 fprintf_filtered (file,
25664 _("Whether to always disassemble "
25665 "DWARF expressions is %s.\n"),
25670 show_check_physname (struct ui_file *file, int from_tty,
25671 struct cmd_list_element *c, const char *value)
25673 fprintf_filtered (file,
25674 _("Whether to check \"physname\" is %s.\n"),
25679 _initialize_dwarf2_read (void)
25681 dwarf2_objfile_data_key
25682 = register_objfile_data_with_cleanup (nullptr, dwarf2_free_objfile);
25684 add_prefix_cmd ("dwarf", class_maintenance, set_dwarf_cmd, _("\
25685 Set DWARF specific variables.\n\
25686 Configure DWARF variables such as the cache size"),
25687 &set_dwarf_cmdlist, "maintenance set dwarf ",
25688 0/*allow-unknown*/, &maintenance_set_cmdlist);
25690 add_prefix_cmd ("dwarf", class_maintenance, show_dwarf_cmd, _("\
25691 Show DWARF specific variables\n\
25692 Show DWARF variables such as the cache size"),
25693 &show_dwarf_cmdlist, "maintenance show dwarf ",
25694 0/*allow-unknown*/, &maintenance_show_cmdlist);
25696 add_setshow_zinteger_cmd ("max-cache-age", class_obscure,
25697 &dwarf_max_cache_age, _("\
25698 Set the upper bound on the age of cached DWARF compilation units."), _("\
25699 Show the upper bound on the age of cached DWARF compilation units."), _("\
25700 A higher limit means that cached compilation units will be stored\n\
25701 in memory longer, and more total memory will be used. Zero disables\n\
25702 caching, which can slow down startup."),
25704 show_dwarf_max_cache_age,
25705 &set_dwarf_cmdlist,
25706 &show_dwarf_cmdlist);
25708 add_setshow_boolean_cmd ("always-disassemble", class_obscure,
25709 &dwarf_always_disassemble, _("\
25710 Set whether `info address' always disassembles DWARF expressions."), _("\
25711 Show whether `info address' always disassembles DWARF expressions."), _("\
25712 When enabled, DWARF expressions are always printed in an assembly-like\n\
25713 syntax. When disabled, expressions will be printed in a more\n\
25714 conversational style, when possible."),
25716 show_dwarf_always_disassemble,
25717 &set_dwarf_cmdlist,
25718 &show_dwarf_cmdlist);
25720 add_setshow_zuinteger_cmd ("dwarf-read", no_class, &dwarf_read_debug, _("\
25721 Set debugging of the DWARF reader."), _("\
25722 Show debugging of the DWARF reader."), _("\
25723 When enabled (non-zero), debugging messages are printed during DWARF\n\
25724 reading and symtab expansion. A value of 1 (one) provides basic\n\
25725 information. A value greater than 1 provides more verbose information."),
25728 &setdebuglist, &showdebuglist);
25730 add_setshow_zuinteger_cmd ("dwarf-die", no_class, &dwarf_die_debug, _("\
25731 Set debugging of the DWARF DIE reader."), _("\
25732 Show debugging of the DWARF DIE reader."), _("\
25733 When enabled (non-zero), DIEs are dumped after they are read in.\n\
25734 The value is the maximum depth to print."),
25737 &setdebuglist, &showdebuglist);
25739 add_setshow_zuinteger_cmd ("dwarf-line", no_class, &dwarf_line_debug, _("\
25740 Set debugging of the dwarf line reader."), _("\
25741 Show debugging of the dwarf line reader."), _("\
25742 When enabled (non-zero), line number entries are dumped as they are read in.\n\
25743 A value of 1 (one) provides basic information.\n\
25744 A value greater than 1 provides more verbose information."),
25747 &setdebuglist, &showdebuglist);
25749 add_setshow_boolean_cmd ("check-physname", no_class, &check_physname, _("\
25750 Set cross-checking of \"physname\" code against demangler."), _("\
25751 Show cross-checking of \"physname\" code against demangler."), _("\
25752 When enabled, GDB's internal \"physname\" code is checked against\n\
25754 NULL, show_check_physname,
25755 &setdebuglist, &showdebuglist);
25757 add_setshow_boolean_cmd ("use-deprecated-index-sections",
25758 no_class, &use_deprecated_index_sections, _("\
25759 Set whether to use deprecated gdb_index sections."), _("\
25760 Show whether to use deprecated gdb_index sections."), _("\
25761 When enabled, deprecated .gdb_index sections are used anyway.\n\
25762 Normally they are ignored either because of a missing feature or\n\
25763 performance issue.\n\
25764 Warning: This option must be enabled before gdb reads the file."),
25767 &setlist, &showlist);
25769 dwarf2_locexpr_index = register_symbol_computed_impl (LOC_COMPUTED,
25770 &dwarf2_locexpr_funcs);
25771 dwarf2_loclist_index = register_symbol_computed_impl (LOC_COMPUTED,
25772 &dwarf2_loclist_funcs);
25774 dwarf2_locexpr_block_index = register_symbol_block_impl (LOC_BLOCK,
25775 &dwarf2_block_frame_base_locexpr_funcs);
25776 dwarf2_loclist_block_index = register_symbol_block_impl (LOC_BLOCK,
25777 &dwarf2_block_frame_base_loclist_funcs);
25780 selftests::register_test ("dw2_expand_symtabs_matching",
25781 selftests::dw2_expand_symtabs_matching::run_test);