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);
9366 case DW_FORM_ref_udata:
9367 case DW_FORM_GNU_addr_index:
9368 case DW_FORM_GNU_str_index:
9369 info_ptr = safe_skip_leb128 (info_ptr, buffer_end);
9371 case DW_FORM_indirect:
9372 form = read_unsigned_leb128 (abfd, info_ptr, &bytes_read);
9373 info_ptr += bytes_read;
9374 /* We need to continue parsing from here, so just go back to
9376 goto skip_attribute;
9379 error (_("Dwarf Error: Cannot handle %s "
9380 "in DWARF reader [in module %s]"),
9381 dwarf_form_name (form),
9382 bfd_get_filename (abfd));
9386 if (abbrev->has_children)
9387 return skip_children (reader, info_ptr);
9392 /* Locate ORIG_PDI's sibling.
9393 INFO_PTR should point to the start of the next DIE after ORIG_PDI. */
9395 static const gdb_byte *
9396 locate_pdi_sibling (const struct die_reader_specs *reader,
9397 struct partial_die_info *orig_pdi,
9398 const gdb_byte *info_ptr)
9400 /* Do we know the sibling already? */
9402 if (orig_pdi->sibling)
9403 return orig_pdi->sibling;
9405 /* Are there any children to deal with? */
9407 if (!orig_pdi->has_children)
9410 /* Skip the children the long way. */
9412 return skip_children (reader, info_ptr);
9415 /* Expand this partial symbol table into a full symbol table. SELF is
9419 dwarf2_read_symtab (struct partial_symtab *self,
9420 struct objfile *objfile)
9422 struct dwarf2_per_objfile *dwarf2_per_objfile
9423 = get_dwarf2_per_objfile (objfile);
9427 warning (_("bug: psymtab for %s is already read in."),
9434 printf_filtered (_("Reading in symbols for %s..."),
9436 gdb_flush (gdb_stdout);
9439 /* If this psymtab is constructed from a debug-only objfile, the
9440 has_section_at_zero flag will not necessarily be correct. We
9441 can get the correct value for this flag by looking at the data
9442 associated with the (presumably stripped) associated objfile. */
9443 if (objfile->separate_debug_objfile_backlink)
9445 struct dwarf2_per_objfile *dpo_backlink
9446 = get_dwarf2_per_objfile (objfile->separate_debug_objfile_backlink);
9448 dwarf2_per_objfile->has_section_at_zero
9449 = dpo_backlink->has_section_at_zero;
9452 dwarf2_per_objfile->reading_partial_symbols = 0;
9454 psymtab_to_symtab_1 (self);
9456 /* Finish up the debug error message. */
9458 printf_filtered (_("done.\n"));
9461 process_cu_includes (dwarf2_per_objfile);
9464 /* Reading in full CUs. */
9466 /* Add PER_CU to the queue. */
9469 queue_comp_unit (struct dwarf2_per_cu_data *per_cu,
9470 enum language pretend_language)
9472 struct dwarf2_queue_item *item;
9475 item = XNEW (struct dwarf2_queue_item);
9476 item->per_cu = per_cu;
9477 item->pretend_language = pretend_language;
9480 if (dwarf2_queue == NULL)
9481 dwarf2_queue = item;
9483 dwarf2_queue_tail->next = item;
9485 dwarf2_queue_tail = item;
9488 /* If PER_CU is not yet queued, add it to the queue.
9489 If DEPENDENT_CU is non-NULL, it has a reference to PER_CU so add a
9491 The result is non-zero if PER_CU was queued, otherwise the result is zero
9492 meaning either PER_CU is already queued or it is already loaded.
9494 N.B. There is an invariant here that if a CU is queued then it is loaded.
9495 The caller is required to load PER_CU if we return non-zero. */
9498 maybe_queue_comp_unit (struct dwarf2_cu *dependent_cu,
9499 struct dwarf2_per_cu_data *per_cu,
9500 enum language pretend_language)
9502 /* We may arrive here during partial symbol reading, if we need full
9503 DIEs to process an unusual case (e.g. template arguments). Do
9504 not queue PER_CU, just tell our caller to load its DIEs. */
9505 if (per_cu->dwarf2_per_objfile->reading_partial_symbols)
9507 if (per_cu->cu == NULL || per_cu->cu->dies == NULL)
9512 /* Mark the dependence relation so that we don't flush PER_CU
9514 if (dependent_cu != NULL)
9515 dwarf2_add_dependence (dependent_cu, per_cu);
9517 /* If it's already on the queue, we have nothing to do. */
9521 /* If the compilation unit is already loaded, just mark it as
9523 if (per_cu->cu != NULL)
9525 per_cu->cu->last_used = 0;
9529 /* Add it to the queue. */
9530 queue_comp_unit (per_cu, pretend_language);
9535 /* Process the queue. */
9538 process_queue (struct dwarf2_per_objfile *dwarf2_per_objfile)
9540 struct dwarf2_queue_item *item, *next_item;
9542 if (dwarf_read_debug)
9544 fprintf_unfiltered (gdb_stdlog,
9545 "Expanding one or more symtabs of objfile %s ...\n",
9546 objfile_name (dwarf2_per_objfile->objfile));
9549 /* The queue starts out with one item, but following a DIE reference
9550 may load a new CU, adding it to the end of the queue. */
9551 for (item = dwarf2_queue; item != NULL; dwarf2_queue = item = next_item)
9553 if ((dwarf2_per_objfile->using_index
9554 ? !item->per_cu->v.quick->compunit_symtab
9555 : (item->per_cu->v.psymtab && !item->per_cu->v.psymtab->readin))
9556 /* Skip dummy CUs. */
9557 && item->per_cu->cu != NULL)
9559 struct dwarf2_per_cu_data *per_cu = item->per_cu;
9560 unsigned int debug_print_threshold;
9563 if (per_cu->is_debug_types)
9565 struct signatured_type *sig_type =
9566 (struct signatured_type *) per_cu;
9568 sprintf (buf, "TU %s at offset %s",
9569 hex_string (sig_type->signature),
9570 sect_offset_str (per_cu->sect_off));
9571 /* There can be 100s of TUs.
9572 Only print them in verbose mode. */
9573 debug_print_threshold = 2;
9577 sprintf (buf, "CU at offset %s",
9578 sect_offset_str (per_cu->sect_off));
9579 debug_print_threshold = 1;
9582 if (dwarf_read_debug >= debug_print_threshold)
9583 fprintf_unfiltered (gdb_stdlog, "Expanding symtab of %s\n", buf);
9585 if (per_cu->is_debug_types)
9586 process_full_type_unit (per_cu, item->pretend_language);
9588 process_full_comp_unit (per_cu, item->pretend_language);
9590 if (dwarf_read_debug >= debug_print_threshold)
9591 fprintf_unfiltered (gdb_stdlog, "Done expanding %s\n", buf);
9594 item->per_cu->queued = 0;
9595 next_item = item->next;
9599 dwarf2_queue_tail = NULL;
9601 if (dwarf_read_debug)
9603 fprintf_unfiltered (gdb_stdlog, "Done expanding symtabs of %s.\n",
9604 objfile_name (dwarf2_per_objfile->objfile));
9608 /* Read in full symbols for PST, and anything it depends on. */
9611 psymtab_to_symtab_1 (struct partial_symtab *pst)
9613 struct dwarf2_per_cu_data *per_cu;
9619 for (i = 0; i < pst->number_of_dependencies; i++)
9620 if (!pst->dependencies[i]->readin
9621 && pst->dependencies[i]->user == NULL)
9623 /* Inform about additional files that need to be read in. */
9626 /* FIXME: i18n: Need to make this a single string. */
9627 fputs_filtered (" ", gdb_stdout);
9629 fputs_filtered ("and ", gdb_stdout);
9631 printf_filtered ("%s...", pst->dependencies[i]->filename);
9632 wrap_here (""); /* Flush output. */
9633 gdb_flush (gdb_stdout);
9635 psymtab_to_symtab_1 (pst->dependencies[i]);
9638 per_cu = (struct dwarf2_per_cu_data *) pst->read_symtab_private;
9642 /* It's an include file, no symbols to read for it.
9643 Everything is in the parent symtab. */
9648 dw2_do_instantiate_symtab (per_cu, false);
9651 /* Trivial hash function for die_info: the hash value of a DIE
9652 is its offset in .debug_info for this objfile. */
9655 die_hash (const void *item)
9657 const struct die_info *die = (const struct die_info *) item;
9659 return to_underlying (die->sect_off);
9662 /* Trivial comparison function for die_info structures: two DIEs
9663 are equal if they have the same offset. */
9666 die_eq (const void *item_lhs, const void *item_rhs)
9668 const struct die_info *die_lhs = (const struct die_info *) item_lhs;
9669 const struct die_info *die_rhs = (const struct die_info *) item_rhs;
9671 return die_lhs->sect_off == die_rhs->sect_off;
9674 /* die_reader_func for load_full_comp_unit.
9675 This is identical to read_signatured_type_reader,
9676 but is kept separate for now. */
9679 load_full_comp_unit_reader (const struct die_reader_specs *reader,
9680 const gdb_byte *info_ptr,
9681 struct die_info *comp_unit_die,
9685 struct dwarf2_cu *cu = reader->cu;
9686 enum language *language_ptr = (enum language *) data;
9688 gdb_assert (cu->die_hash == NULL);
9690 htab_create_alloc_ex (cu->header.length / 12,
9694 &cu->comp_unit_obstack,
9695 hashtab_obstack_allocate,
9696 dummy_obstack_deallocate);
9699 comp_unit_die->child = read_die_and_siblings (reader, info_ptr,
9700 &info_ptr, comp_unit_die);
9701 cu->dies = comp_unit_die;
9702 /* comp_unit_die is not stored in die_hash, no need. */
9704 /* We try not to read any attributes in this function, because not
9705 all CUs needed for references have been loaded yet, and symbol
9706 table processing isn't initialized. But we have to set the CU language,
9707 or we won't be able to build types correctly.
9708 Similarly, if we do not read the producer, we can not apply
9709 producer-specific interpretation. */
9710 prepare_one_comp_unit (cu, cu->dies, *language_ptr);
9713 /* Load the DIEs associated with PER_CU into memory. */
9716 load_full_comp_unit (struct dwarf2_per_cu_data *this_cu,
9718 enum language pretend_language)
9720 gdb_assert (! this_cu->is_debug_types);
9722 init_cutu_and_read_dies (this_cu, NULL, 1, 1, skip_partial,
9723 load_full_comp_unit_reader, &pretend_language);
9726 /* Add a DIE to the delayed physname list. */
9729 add_to_method_list (struct type *type, int fnfield_index, int index,
9730 const char *name, struct die_info *die,
9731 struct dwarf2_cu *cu)
9733 struct delayed_method_info mi;
9735 mi.fnfield_index = fnfield_index;
9739 cu->method_list.push_back (mi);
9742 /* Check whether [PHYSNAME, PHYSNAME+LEN) ends with a modifier like
9743 "const" / "volatile". If so, decrements LEN by the length of the
9744 modifier and return true. Otherwise return false. */
9748 check_modifier (const char *physname, size_t &len, const char (&mod)[N])
9750 size_t mod_len = sizeof (mod) - 1;
9751 if (len > mod_len && startswith (physname + (len - mod_len), mod))
9759 /* Compute the physnames of any methods on the CU's method list.
9761 The computation of method physnames is delayed in order to avoid the
9762 (bad) condition that one of the method's formal parameters is of an as yet
9766 compute_delayed_physnames (struct dwarf2_cu *cu)
9768 /* Only C++ delays computing physnames. */
9769 if (cu->method_list.empty ())
9771 gdb_assert (cu->language == language_cplus);
9773 for (const delayed_method_info &mi : cu->method_list)
9775 const char *physname;
9776 struct fn_fieldlist *fn_flp
9777 = &TYPE_FN_FIELDLIST (mi.type, mi.fnfield_index);
9778 physname = dwarf2_physname (mi.name, mi.die, cu);
9779 TYPE_FN_FIELD_PHYSNAME (fn_flp->fn_fields, mi.index)
9780 = physname ? physname : "";
9782 /* Since there's no tag to indicate whether a method is a
9783 const/volatile overload, extract that information out of the
9785 if (physname != NULL)
9787 size_t len = strlen (physname);
9791 if (physname[len] == ')') /* shortcut */
9793 else if (check_modifier (physname, len, " const"))
9794 TYPE_FN_FIELD_CONST (fn_flp->fn_fields, mi.index) = 1;
9795 else if (check_modifier (physname, len, " volatile"))
9796 TYPE_FN_FIELD_VOLATILE (fn_flp->fn_fields, mi.index) = 1;
9803 /* The list is no longer needed. */
9804 cu->method_list.clear ();
9807 /* Go objects should be embedded in a DW_TAG_module DIE,
9808 and it's not clear if/how imported objects will appear.
9809 To keep Go support simple until that's worked out,
9810 go back through what we've read and create something usable.
9811 We could do this while processing each DIE, and feels kinda cleaner,
9812 but that way is more invasive.
9813 This is to, for example, allow the user to type "p var" or "b main"
9814 without having to specify the package name, and allow lookups
9815 of module.object to work in contexts that use the expression
9819 fixup_go_packaging (struct dwarf2_cu *cu)
9821 char *package_name = NULL;
9822 struct pending *list;
9825 for (list = *cu->get_builder ()->get_global_symbols ();
9829 for (i = 0; i < list->nsyms; ++i)
9831 struct symbol *sym = list->symbol[i];
9833 if (SYMBOL_LANGUAGE (sym) == language_go
9834 && SYMBOL_CLASS (sym) == LOC_BLOCK)
9836 char *this_package_name = go_symbol_package_name (sym);
9838 if (this_package_name == NULL)
9840 if (package_name == NULL)
9841 package_name = this_package_name;
9844 struct objfile *objfile
9845 = cu->per_cu->dwarf2_per_objfile->objfile;
9846 if (strcmp (package_name, this_package_name) != 0)
9847 complaint (_("Symtab %s has objects from two different Go packages: %s and %s"),
9848 (symbol_symtab (sym) != NULL
9849 ? symtab_to_filename_for_display
9850 (symbol_symtab (sym))
9851 : objfile_name (objfile)),
9852 this_package_name, package_name);
9853 xfree (this_package_name);
9859 if (package_name != NULL)
9861 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
9862 const char *saved_package_name
9863 = (const char *) obstack_copy0 (&objfile->per_bfd->storage_obstack,
9865 strlen (package_name));
9866 struct type *type = init_type (objfile, TYPE_CODE_MODULE, 0,
9867 saved_package_name);
9870 sym = allocate_symbol (objfile);
9871 SYMBOL_SET_LANGUAGE (sym, language_go, &objfile->objfile_obstack);
9872 SYMBOL_SET_NAMES (sym, saved_package_name,
9873 strlen (saved_package_name), 0, objfile);
9874 /* This is not VAR_DOMAIN because we want a way to ensure a lookup of,
9875 e.g., "main" finds the "main" module and not C's main(). */
9876 SYMBOL_DOMAIN (sym) = STRUCT_DOMAIN;
9877 SYMBOL_ACLASS_INDEX (sym) = LOC_TYPEDEF;
9878 SYMBOL_TYPE (sym) = type;
9880 add_symbol_to_list (sym, cu->get_builder ()->get_global_symbols ());
9882 xfree (package_name);
9886 /* Allocate a fully-qualified name consisting of the two parts on the
9890 rust_fully_qualify (struct obstack *obstack, const char *p1, const char *p2)
9892 return obconcat (obstack, p1, "::", p2, (char *) NULL);
9895 /* A helper that allocates a struct discriminant_info to attach to a
9898 static struct discriminant_info *
9899 alloc_discriminant_info (struct type *type, int discriminant_index,
9902 gdb_assert (TYPE_CODE (type) == TYPE_CODE_UNION);
9903 gdb_assert (discriminant_index == -1
9904 || (discriminant_index >= 0
9905 && discriminant_index < TYPE_NFIELDS (type)));
9906 gdb_assert (default_index == -1
9907 || (default_index >= 0 && default_index < TYPE_NFIELDS (type)));
9909 TYPE_FLAG_DISCRIMINATED_UNION (type) = 1;
9911 struct discriminant_info *disc
9912 = ((struct discriminant_info *)
9914 offsetof (struct discriminant_info, discriminants)
9915 + TYPE_NFIELDS (type) * sizeof (disc->discriminants[0])));
9916 disc->default_index = default_index;
9917 disc->discriminant_index = discriminant_index;
9919 struct dynamic_prop prop;
9920 prop.kind = PROP_UNDEFINED;
9921 prop.data.baton = disc;
9923 add_dyn_prop (DYN_PROP_DISCRIMINATED, prop, type);
9928 /* Some versions of rustc emitted enums in an unusual way.
9930 Ordinary enums were emitted as unions. The first element of each
9931 structure in the union was named "RUST$ENUM$DISR". This element
9932 held the discriminant.
9934 These versions of Rust also implemented the "non-zero"
9935 optimization. When the enum had two values, and one is empty and
9936 the other holds a pointer that cannot be zero, the pointer is used
9937 as the discriminant, with a zero value meaning the empty variant.
9938 Here, the union's first member is of the form
9939 RUST$ENCODED$ENUM$<fieldno>$<fieldno>$...$<variantname>
9940 where the fieldnos are the indices of the fields that should be
9941 traversed in order to find the field (which may be several fields deep)
9942 and the variantname is the name of the variant of the case when the
9945 This function recognizes whether TYPE is of one of these forms,
9946 and, if so, smashes it to be a variant type. */
9949 quirk_rust_enum (struct type *type, struct objfile *objfile)
9951 gdb_assert (TYPE_CODE (type) == TYPE_CODE_UNION);
9953 /* We don't need to deal with empty enums. */
9954 if (TYPE_NFIELDS (type) == 0)
9957 #define RUST_ENUM_PREFIX "RUST$ENCODED$ENUM$"
9958 if (TYPE_NFIELDS (type) == 1
9959 && startswith (TYPE_FIELD_NAME (type, 0), RUST_ENUM_PREFIX))
9961 const char *name = TYPE_FIELD_NAME (type, 0) + strlen (RUST_ENUM_PREFIX);
9963 /* Decode the field name to find the offset of the
9965 ULONGEST bit_offset = 0;
9966 struct type *field_type = TYPE_FIELD_TYPE (type, 0);
9967 while (name[0] >= '0' && name[0] <= '9')
9970 unsigned long index = strtoul (name, &tail, 10);
9973 || index >= TYPE_NFIELDS (field_type)
9974 || (TYPE_FIELD_LOC_KIND (field_type, index)
9975 != FIELD_LOC_KIND_BITPOS))
9977 complaint (_("Could not parse Rust enum encoding string \"%s\""
9979 TYPE_FIELD_NAME (type, 0),
9980 objfile_name (objfile));
9985 bit_offset += TYPE_FIELD_BITPOS (field_type, index);
9986 field_type = TYPE_FIELD_TYPE (field_type, index);
9989 /* Make a union to hold the variants. */
9990 struct type *union_type = alloc_type (objfile);
9991 TYPE_CODE (union_type) = TYPE_CODE_UNION;
9992 TYPE_NFIELDS (union_type) = 3;
9993 TYPE_FIELDS (union_type)
9994 = (struct field *) TYPE_ZALLOC (type, 3 * sizeof (struct field));
9995 TYPE_LENGTH (union_type) = TYPE_LENGTH (type);
9996 set_type_align (union_type, TYPE_RAW_ALIGN (type));
9998 /* Put the discriminant must at index 0. */
9999 TYPE_FIELD_TYPE (union_type, 0) = field_type;
10000 TYPE_FIELD_ARTIFICIAL (union_type, 0) = 1;
10001 TYPE_FIELD_NAME (union_type, 0) = "<<discriminant>>";
10002 SET_FIELD_BITPOS (TYPE_FIELD (union_type, 0), bit_offset);
10004 /* The order of fields doesn't really matter, so put the real
10005 field at index 1 and the data-less field at index 2. */
10006 struct discriminant_info *disc
10007 = alloc_discriminant_info (union_type, 0, 1);
10008 TYPE_FIELD (union_type, 1) = TYPE_FIELD (type, 0);
10009 TYPE_FIELD_NAME (union_type, 1)
10010 = rust_last_path_segment (TYPE_NAME (TYPE_FIELD_TYPE (union_type, 1)));
10011 TYPE_NAME (TYPE_FIELD_TYPE (union_type, 1))
10012 = rust_fully_qualify (&objfile->objfile_obstack, TYPE_NAME (type),
10013 TYPE_FIELD_NAME (union_type, 1));
10015 const char *dataless_name
10016 = rust_fully_qualify (&objfile->objfile_obstack, TYPE_NAME (type),
10018 struct type *dataless_type = init_type (objfile, TYPE_CODE_VOID, 0,
10020 TYPE_FIELD_TYPE (union_type, 2) = dataless_type;
10021 /* NAME points into the original discriminant name, which
10022 already has the correct lifetime. */
10023 TYPE_FIELD_NAME (union_type, 2) = name;
10024 SET_FIELD_BITPOS (TYPE_FIELD (union_type, 2), 0);
10025 disc->discriminants[2] = 0;
10027 /* Smash this type to be a structure type. We have to do this
10028 because the type has already been recorded. */
10029 TYPE_CODE (type) = TYPE_CODE_STRUCT;
10030 TYPE_NFIELDS (type) = 1;
10032 = (struct field *) TYPE_ZALLOC (type, sizeof (struct field));
10034 /* Install the variant part. */
10035 TYPE_FIELD_TYPE (type, 0) = union_type;
10036 SET_FIELD_BITPOS (TYPE_FIELD (type, 0), 0);
10037 TYPE_FIELD_NAME (type, 0) = "<<variants>>";
10039 else if (TYPE_NFIELDS (type) == 1)
10041 /* We assume that a union with a single field is a univariant
10043 /* Smash this type to be a structure type. We have to do this
10044 because the type has already been recorded. */
10045 TYPE_CODE (type) = TYPE_CODE_STRUCT;
10047 /* Make a union to hold the variants. */
10048 struct type *union_type = alloc_type (objfile);
10049 TYPE_CODE (union_type) = TYPE_CODE_UNION;
10050 TYPE_NFIELDS (union_type) = TYPE_NFIELDS (type);
10051 TYPE_LENGTH (union_type) = TYPE_LENGTH (type);
10052 set_type_align (union_type, TYPE_RAW_ALIGN (type));
10053 TYPE_FIELDS (union_type) = TYPE_FIELDS (type);
10055 struct type *field_type = TYPE_FIELD_TYPE (union_type, 0);
10056 const char *variant_name
10057 = rust_last_path_segment (TYPE_NAME (field_type));
10058 TYPE_FIELD_NAME (union_type, 0) = variant_name;
10059 TYPE_NAME (field_type)
10060 = rust_fully_qualify (&objfile->objfile_obstack,
10061 TYPE_NAME (type), variant_name);
10063 /* Install the union in the outer struct type. */
10064 TYPE_NFIELDS (type) = 1;
10066 = (struct field *) TYPE_ZALLOC (union_type, sizeof (struct field));
10067 TYPE_FIELD_TYPE (type, 0) = union_type;
10068 TYPE_FIELD_NAME (type, 0) = "<<variants>>";
10069 SET_FIELD_BITPOS (TYPE_FIELD (type, 0), 0);
10071 alloc_discriminant_info (union_type, -1, 0);
10075 struct type *disr_type = nullptr;
10076 for (int i = 0; i < TYPE_NFIELDS (type); ++i)
10078 disr_type = TYPE_FIELD_TYPE (type, i);
10080 if (TYPE_CODE (disr_type) != TYPE_CODE_STRUCT)
10082 /* All fields of a true enum will be structs. */
10085 else if (TYPE_NFIELDS (disr_type) == 0)
10087 /* Could be data-less variant, so keep going. */
10088 disr_type = nullptr;
10090 else if (strcmp (TYPE_FIELD_NAME (disr_type, 0),
10091 "RUST$ENUM$DISR") != 0)
10093 /* Not a Rust enum. */
10103 /* If we got here without a discriminant, then it's probably
10105 if (disr_type == nullptr)
10108 /* Smash this type to be a structure type. We have to do this
10109 because the type has already been recorded. */
10110 TYPE_CODE (type) = TYPE_CODE_STRUCT;
10112 /* Make a union to hold the variants. */
10113 struct field *disr_field = &TYPE_FIELD (disr_type, 0);
10114 struct type *union_type = alloc_type (objfile);
10115 TYPE_CODE (union_type) = TYPE_CODE_UNION;
10116 TYPE_NFIELDS (union_type) = 1 + TYPE_NFIELDS (type);
10117 TYPE_LENGTH (union_type) = TYPE_LENGTH (type);
10118 set_type_align (union_type, TYPE_RAW_ALIGN (type));
10119 TYPE_FIELDS (union_type)
10120 = (struct field *) TYPE_ZALLOC (union_type,
10121 (TYPE_NFIELDS (union_type)
10122 * sizeof (struct field)));
10124 memcpy (TYPE_FIELDS (union_type) + 1, TYPE_FIELDS (type),
10125 TYPE_NFIELDS (type) * sizeof (struct field));
10127 /* Install the discriminant at index 0 in the union. */
10128 TYPE_FIELD (union_type, 0) = *disr_field;
10129 TYPE_FIELD_ARTIFICIAL (union_type, 0) = 1;
10130 TYPE_FIELD_NAME (union_type, 0) = "<<discriminant>>";
10132 /* Install the union in the outer struct type. */
10133 TYPE_FIELD_TYPE (type, 0) = union_type;
10134 TYPE_FIELD_NAME (type, 0) = "<<variants>>";
10135 TYPE_NFIELDS (type) = 1;
10137 /* Set the size and offset of the union type. */
10138 SET_FIELD_BITPOS (TYPE_FIELD (type, 0), 0);
10140 /* We need a way to find the correct discriminant given a
10141 variant name. For convenience we build a map here. */
10142 struct type *enum_type = FIELD_TYPE (*disr_field);
10143 std::unordered_map<std::string, ULONGEST> discriminant_map;
10144 for (int i = 0; i < TYPE_NFIELDS (enum_type); ++i)
10146 if (TYPE_FIELD_LOC_KIND (enum_type, i) == FIELD_LOC_KIND_ENUMVAL)
10149 = rust_last_path_segment (TYPE_FIELD_NAME (enum_type, i));
10150 discriminant_map[name] = TYPE_FIELD_ENUMVAL (enum_type, i);
10154 int n_fields = TYPE_NFIELDS (union_type);
10155 struct discriminant_info *disc
10156 = alloc_discriminant_info (union_type, 0, -1);
10157 /* Skip the discriminant here. */
10158 for (int i = 1; i < n_fields; ++i)
10160 /* Find the final word in the name of this variant's type.
10161 That name can be used to look up the correct
10163 const char *variant_name
10164 = rust_last_path_segment (TYPE_NAME (TYPE_FIELD_TYPE (union_type,
10167 auto iter = discriminant_map.find (variant_name);
10168 if (iter != discriminant_map.end ())
10169 disc->discriminants[i] = iter->second;
10171 /* Remove the discriminant field, if it exists. */
10172 struct type *sub_type = TYPE_FIELD_TYPE (union_type, i);
10173 if (TYPE_NFIELDS (sub_type) > 0)
10175 --TYPE_NFIELDS (sub_type);
10176 ++TYPE_FIELDS (sub_type);
10178 TYPE_FIELD_NAME (union_type, i) = variant_name;
10179 TYPE_NAME (sub_type)
10180 = rust_fully_qualify (&objfile->objfile_obstack,
10181 TYPE_NAME (type), variant_name);
10186 /* Rewrite some Rust unions to be structures with variants parts. */
10189 rust_union_quirks (struct dwarf2_cu *cu)
10191 gdb_assert (cu->language == language_rust);
10192 for (type *type_ : cu->rust_unions)
10193 quirk_rust_enum (type_, cu->per_cu->dwarf2_per_objfile->objfile);
10194 /* We don't need this any more. */
10195 cu->rust_unions.clear ();
10198 /* Return the symtab for PER_CU. This works properly regardless of
10199 whether we're using the index or psymtabs. */
10201 static struct compunit_symtab *
10202 get_compunit_symtab (struct dwarf2_per_cu_data *per_cu)
10204 return (per_cu->dwarf2_per_objfile->using_index
10205 ? per_cu->v.quick->compunit_symtab
10206 : per_cu->v.psymtab->compunit_symtab);
10209 /* A helper function for computing the list of all symbol tables
10210 included by PER_CU. */
10213 recursively_compute_inclusions (std::vector<compunit_symtab *> *result,
10214 htab_t all_children, htab_t all_type_symtabs,
10215 struct dwarf2_per_cu_data *per_cu,
10216 struct compunit_symtab *immediate_parent)
10220 struct compunit_symtab *cust;
10221 struct dwarf2_per_cu_data *iter;
10223 slot = htab_find_slot (all_children, per_cu, INSERT);
10226 /* This inclusion and its children have been processed. */
10231 /* Only add a CU if it has a symbol table. */
10232 cust = get_compunit_symtab (per_cu);
10235 /* If this is a type unit only add its symbol table if we haven't
10236 seen it yet (type unit per_cu's can share symtabs). */
10237 if (per_cu->is_debug_types)
10239 slot = htab_find_slot (all_type_symtabs, cust, INSERT);
10243 result->push_back (cust);
10244 if (cust->user == NULL)
10245 cust->user = immediate_parent;
10250 result->push_back (cust);
10251 if (cust->user == NULL)
10252 cust->user = immediate_parent;
10257 VEC_iterate (dwarf2_per_cu_ptr, per_cu->imported_symtabs, ix, iter);
10260 recursively_compute_inclusions (result, all_children,
10261 all_type_symtabs, iter, cust);
10265 /* Compute the compunit_symtab 'includes' fields for the compunit_symtab of
10269 compute_compunit_symtab_includes (struct dwarf2_per_cu_data *per_cu)
10271 gdb_assert (! per_cu->is_debug_types);
10273 if (!VEC_empty (dwarf2_per_cu_ptr, per_cu->imported_symtabs))
10276 struct dwarf2_per_cu_data *per_cu_iter;
10277 std::vector<compunit_symtab *> result_symtabs;
10278 htab_t all_children, all_type_symtabs;
10279 struct compunit_symtab *cust = get_compunit_symtab (per_cu);
10281 /* If we don't have a symtab, we can just skip this case. */
10285 all_children = htab_create_alloc (1, htab_hash_pointer, htab_eq_pointer,
10286 NULL, xcalloc, xfree);
10287 all_type_symtabs = htab_create_alloc (1, htab_hash_pointer, htab_eq_pointer,
10288 NULL, xcalloc, xfree);
10291 VEC_iterate (dwarf2_per_cu_ptr, per_cu->imported_symtabs,
10295 recursively_compute_inclusions (&result_symtabs, all_children,
10296 all_type_symtabs, per_cu_iter,
10300 /* Now we have a transitive closure of all the included symtabs. */
10301 len = result_symtabs.size ();
10303 = XOBNEWVEC (&per_cu->dwarf2_per_objfile->objfile->objfile_obstack,
10304 struct compunit_symtab *, len + 1);
10305 memcpy (cust->includes, result_symtabs.data (),
10306 len * sizeof (compunit_symtab *));
10307 cust->includes[len] = NULL;
10309 htab_delete (all_children);
10310 htab_delete (all_type_symtabs);
10314 /* Compute the 'includes' field for the symtabs of all the CUs we just
10318 process_cu_includes (struct dwarf2_per_objfile *dwarf2_per_objfile)
10320 for (dwarf2_per_cu_data *iter : dwarf2_per_objfile->just_read_cus)
10322 if (! iter->is_debug_types)
10323 compute_compunit_symtab_includes (iter);
10326 dwarf2_per_objfile->just_read_cus.clear ();
10329 /* Generate full symbol information for PER_CU, whose DIEs have
10330 already been loaded into memory. */
10333 process_full_comp_unit (struct dwarf2_per_cu_data *per_cu,
10334 enum language pretend_language)
10336 struct dwarf2_cu *cu = per_cu->cu;
10337 struct dwarf2_per_objfile *dwarf2_per_objfile = per_cu->dwarf2_per_objfile;
10338 struct objfile *objfile = dwarf2_per_objfile->objfile;
10339 struct gdbarch *gdbarch = get_objfile_arch (objfile);
10340 CORE_ADDR lowpc, highpc;
10341 struct compunit_symtab *cust;
10342 CORE_ADDR baseaddr;
10343 struct block *static_block;
10346 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
10348 /* Clear the list here in case something was left over. */
10349 cu->method_list.clear ();
10351 cu->language = pretend_language;
10352 cu->language_defn = language_def (cu->language);
10354 /* Do line number decoding in read_file_scope () */
10355 process_die (cu->dies, cu);
10357 /* For now fudge the Go package. */
10358 if (cu->language == language_go)
10359 fixup_go_packaging (cu);
10361 /* Now that we have processed all the DIEs in the CU, all the types
10362 should be complete, and it should now be safe to compute all of the
10364 compute_delayed_physnames (cu);
10366 if (cu->language == language_rust)
10367 rust_union_quirks (cu);
10369 /* Some compilers don't define a DW_AT_high_pc attribute for the
10370 compilation unit. If the DW_AT_high_pc is missing, synthesize
10371 it, by scanning the DIE's below the compilation unit. */
10372 get_scope_pc_bounds (cu->dies, &lowpc, &highpc, cu);
10374 addr = gdbarch_adjust_dwarf2_addr (gdbarch, highpc + baseaddr);
10375 static_block = cu->get_builder ()->end_symtab_get_static_block (addr, 0, 1);
10377 /* If the comp unit has DW_AT_ranges, it may have discontiguous ranges.
10378 Also, DW_AT_ranges may record ranges not belonging to any child DIEs
10379 (such as virtual method tables). Record the ranges in STATIC_BLOCK's
10380 addrmap to help ensure it has an accurate map of pc values belonging to
10382 dwarf2_record_block_ranges (cu->dies, static_block, baseaddr, cu);
10384 cust = cu->get_builder ()->end_symtab_from_static_block (static_block,
10385 SECT_OFF_TEXT (objfile),
10390 int gcc_4_minor = producer_is_gcc_ge_4 (cu->producer);
10392 /* Set symtab language to language from DW_AT_language. If the
10393 compilation is from a C file generated by language preprocessors, do
10394 not set the language if it was already deduced by start_subfile. */
10395 if (!(cu->language == language_c
10396 && COMPUNIT_FILETABS (cust)->language != language_unknown))
10397 COMPUNIT_FILETABS (cust)->language = cu->language;
10399 /* GCC-4.0 has started to support -fvar-tracking. GCC-3.x still can
10400 produce DW_AT_location with location lists but it can be possibly
10401 invalid without -fvar-tracking. Still up to GCC-4.4.x incl. 4.4.0
10402 there were bugs in prologue debug info, fixed later in GCC-4.5
10403 by "unwind info for epilogues" patch (which is not directly related).
10405 For -gdwarf-4 type units LOCATIONS_VALID indication is fortunately not
10406 needed, it would be wrong due to missing DW_AT_producer there.
10408 Still one can confuse GDB by using non-standard GCC compilation
10409 options - this waits on GCC PR other/32998 (-frecord-gcc-switches).
10411 if (cu->has_loclist && gcc_4_minor >= 5)
10412 cust->locations_valid = 1;
10414 if (gcc_4_minor >= 5)
10415 cust->epilogue_unwind_valid = 1;
10417 cust->call_site_htab = cu->call_site_htab;
10420 if (dwarf2_per_objfile->using_index)
10421 per_cu->v.quick->compunit_symtab = cust;
10424 struct partial_symtab *pst = per_cu->v.psymtab;
10425 pst->compunit_symtab = cust;
10429 /* Push it for inclusion processing later. */
10430 dwarf2_per_objfile->just_read_cus.push_back (per_cu);
10432 /* Not needed any more. */
10433 cu->reset_builder ();
10436 /* Generate full symbol information for type unit PER_CU, whose DIEs have
10437 already been loaded into memory. */
10440 process_full_type_unit (struct dwarf2_per_cu_data *per_cu,
10441 enum language pretend_language)
10443 struct dwarf2_cu *cu = per_cu->cu;
10444 struct dwarf2_per_objfile *dwarf2_per_objfile = per_cu->dwarf2_per_objfile;
10445 struct objfile *objfile = dwarf2_per_objfile->objfile;
10446 struct compunit_symtab *cust;
10447 struct signatured_type *sig_type;
10449 gdb_assert (per_cu->is_debug_types);
10450 sig_type = (struct signatured_type *) per_cu;
10452 /* Clear the list here in case something was left over. */
10453 cu->method_list.clear ();
10455 cu->language = pretend_language;
10456 cu->language_defn = language_def (cu->language);
10458 /* The symbol tables are set up in read_type_unit_scope. */
10459 process_die (cu->dies, cu);
10461 /* For now fudge the Go package. */
10462 if (cu->language == language_go)
10463 fixup_go_packaging (cu);
10465 /* Now that we have processed all the DIEs in the CU, all the types
10466 should be complete, and it should now be safe to compute all of the
10468 compute_delayed_physnames (cu);
10470 if (cu->language == language_rust)
10471 rust_union_quirks (cu);
10473 /* TUs share symbol tables.
10474 If this is the first TU to use this symtab, complete the construction
10475 of it with end_expandable_symtab. Otherwise, complete the addition of
10476 this TU's symbols to the existing symtab. */
10477 if (sig_type->type_unit_group->compunit_symtab == NULL)
10479 buildsym_compunit *builder = cu->get_builder ();
10480 cust = builder->end_expandable_symtab (0, SECT_OFF_TEXT (objfile));
10481 sig_type->type_unit_group->compunit_symtab = cust;
10485 /* Set symtab language to language from DW_AT_language. If the
10486 compilation is from a C file generated by language preprocessors,
10487 do not set the language if it was already deduced by
10489 if (!(cu->language == language_c
10490 && COMPUNIT_FILETABS (cust)->language != language_c))
10491 COMPUNIT_FILETABS (cust)->language = cu->language;
10496 cu->get_builder ()->augment_type_symtab ();
10497 cust = sig_type->type_unit_group->compunit_symtab;
10500 if (dwarf2_per_objfile->using_index)
10501 per_cu->v.quick->compunit_symtab = cust;
10504 struct partial_symtab *pst = per_cu->v.psymtab;
10505 pst->compunit_symtab = cust;
10509 /* Not needed any more. */
10510 cu->reset_builder ();
10513 /* Process an imported unit DIE. */
10516 process_imported_unit_die (struct die_info *die, struct dwarf2_cu *cu)
10518 struct attribute *attr;
10520 /* For now we don't handle imported units in type units. */
10521 if (cu->per_cu->is_debug_types)
10523 error (_("Dwarf Error: DW_TAG_imported_unit is not"
10524 " supported in type units [in module %s]"),
10525 objfile_name (cu->per_cu->dwarf2_per_objfile->objfile));
10528 attr = dwarf2_attr (die, DW_AT_import, cu);
10531 sect_offset sect_off = dwarf2_get_ref_die_offset (attr);
10532 bool is_dwz = (attr->form == DW_FORM_GNU_ref_alt || cu->per_cu->is_dwz);
10533 dwarf2_per_cu_data *per_cu
10534 = dwarf2_find_containing_comp_unit (sect_off, is_dwz,
10535 cu->per_cu->dwarf2_per_objfile);
10537 /* If necessary, add it to the queue and load its DIEs. */
10538 if (maybe_queue_comp_unit (cu, per_cu, cu->language))
10539 load_full_comp_unit (per_cu, false, cu->language);
10541 VEC_safe_push (dwarf2_per_cu_ptr, cu->per_cu->imported_symtabs,
10546 /* RAII object that represents a process_die scope: i.e.,
10547 starts/finishes processing a DIE. */
10548 class process_die_scope
10551 process_die_scope (die_info *die, dwarf2_cu *cu)
10552 : m_die (die), m_cu (cu)
10554 /* We should only be processing DIEs not already in process. */
10555 gdb_assert (!m_die->in_process);
10556 m_die->in_process = true;
10559 ~process_die_scope ()
10561 m_die->in_process = false;
10563 /* If we're done processing the DIE for the CU that owns the line
10564 header, we don't need the line header anymore. */
10565 if (m_cu->line_header_die_owner == m_die)
10567 delete m_cu->line_header;
10568 m_cu->line_header = NULL;
10569 m_cu->line_header_die_owner = NULL;
10578 /* Process a die and its children. */
10581 process_die (struct die_info *die, struct dwarf2_cu *cu)
10583 process_die_scope scope (die, cu);
10587 case DW_TAG_padding:
10589 case DW_TAG_compile_unit:
10590 case DW_TAG_partial_unit:
10591 read_file_scope (die, cu);
10593 case DW_TAG_type_unit:
10594 read_type_unit_scope (die, cu);
10596 case DW_TAG_subprogram:
10597 case DW_TAG_inlined_subroutine:
10598 read_func_scope (die, cu);
10600 case DW_TAG_lexical_block:
10601 case DW_TAG_try_block:
10602 case DW_TAG_catch_block:
10603 read_lexical_block_scope (die, cu);
10605 case DW_TAG_call_site:
10606 case DW_TAG_GNU_call_site:
10607 read_call_site_scope (die, cu);
10609 case DW_TAG_class_type:
10610 case DW_TAG_interface_type:
10611 case DW_TAG_structure_type:
10612 case DW_TAG_union_type:
10613 process_structure_scope (die, cu);
10615 case DW_TAG_enumeration_type:
10616 process_enumeration_scope (die, cu);
10619 /* These dies have a type, but processing them does not create
10620 a symbol or recurse to process the children. Therefore we can
10621 read them on-demand through read_type_die. */
10622 case DW_TAG_subroutine_type:
10623 case DW_TAG_set_type:
10624 case DW_TAG_array_type:
10625 case DW_TAG_pointer_type:
10626 case DW_TAG_ptr_to_member_type:
10627 case DW_TAG_reference_type:
10628 case DW_TAG_rvalue_reference_type:
10629 case DW_TAG_string_type:
10632 case DW_TAG_base_type:
10633 case DW_TAG_subrange_type:
10634 case DW_TAG_typedef:
10635 /* Add a typedef symbol for the type definition, if it has a
10637 new_symbol (die, read_type_die (die, cu), cu);
10639 case DW_TAG_common_block:
10640 read_common_block (die, cu);
10642 case DW_TAG_common_inclusion:
10644 case DW_TAG_namespace:
10645 cu->processing_has_namespace_info = true;
10646 read_namespace (die, cu);
10648 case DW_TAG_module:
10649 cu->processing_has_namespace_info = true;
10650 read_module (die, cu);
10652 case DW_TAG_imported_declaration:
10653 cu->processing_has_namespace_info = true;
10654 if (read_namespace_alias (die, cu))
10656 /* The declaration is not a global namespace alias. */
10657 /* Fall through. */
10658 case DW_TAG_imported_module:
10659 cu->processing_has_namespace_info = true;
10660 if (die->child != NULL && (die->tag == DW_TAG_imported_declaration
10661 || cu->language != language_fortran))
10662 complaint (_("Tag '%s' has unexpected children"),
10663 dwarf_tag_name (die->tag));
10664 read_import_statement (die, cu);
10667 case DW_TAG_imported_unit:
10668 process_imported_unit_die (die, cu);
10671 case DW_TAG_variable:
10672 read_variable (die, cu);
10676 new_symbol (die, NULL, cu);
10681 /* DWARF name computation. */
10683 /* A helper function for dwarf2_compute_name which determines whether DIE
10684 needs to have the name of the scope prepended to the name listed in the
10688 die_needs_namespace (struct die_info *die, struct dwarf2_cu *cu)
10690 struct attribute *attr;
10694 case DW_TAG_namespace:
10695 case DW_TAG_typedef:
10696 case DW_TAG_class_type:
10697 case DW_TAG_interface_type:
10698 case DW_TAG_structure_type:
10699 case DW_TAG_union_type:
10700 case DW_TAG_enumeration_type:
10701 case DW_TAG_enumerator:
10702 case DW_TAG_subprogram:
10703 case DW_TAG_inlined_subroutine:
10704 case DW_TAG_member:
10705 case DW_TAG_imported_declaration:
10708 case DW_TAG_variable:
10709 case DW_TAG_constant:
10710 /* We only need to prefix "globally" visible variables. These include
10711 any variable marked with DW_AT_external or any variable that
10712 lives in a namespace. [Variables in anonymous namespaces
10713 require prefixing, but they are not DW_AT_external.] */
10715 if (dwarf2_attr (die, DW_AT_specification, cu))
10717 struct dwarf2_cu *spec_cu = cu;
10719 return die_needs_namespace (die_specification (die, &spec_cu),
10723 attr = dwarf2_attr (die, DW_AT_external, cu);
10724 if (attr == NULL && die->parent->tag != DW_TAG_namespace
10725 && die->parent->tag != DW_TAG_module)
10727 /* A variable in a lexical block of some kind does not need a
10728 namespace, even though in C++ such variables may be external
10729 and have a mangled name. */
10730 if (die->parent->tag == DW_TAG_lexical_block
10731 || die->parent->tag == DW_TAG_try_block
10732 || die->parent->tag == DW_TAG_catch_block
10733 || die->parent->tag == DW_TAG_subprogram)
10742 /* Return the DIE's linkage name attribute, either DW_AT_linkage_name
10743 or DW_AT_MIPS_linkage_name. Returns NULL if the attribute is not
10744 defined for the given DIE. */
10746 static struct attribute *
10747 dw2_linkage_name_attr (struct die_info *die, struct dwarf2_cu *cu)
10749 struct attribute *attr;
10751 attr = dwarf2_attr (die, DW_AT_linkage_name, cu);
10753 attr = dwarf2_attr (die, DW_AT_MIPS_linkage_name, cu);
10758 /* Return the DIE's linkage name as a string, either DW_AT_linkage_name
10759 or DW_AT_MIPS_linkage_name. Returns NULL if the attribute is not
10760 defined for the given DIE. */
10762 static const char *
10763 dw2_linkage_name (struct die_info *die, struct dwarf2_cu *cu)
10765 const char *linkage_name;
10767 linkage_name = dwarf2_string_attr (die, DW_AT_linkage_name, cu);
10768 if (linkage_name == NULL)
10769 linkage_name = dwarf2_string_attr (die, DW_AT_MIPS_linkage_name, cu);
10771 return linkage_name;
10774 /* Compute the fully qualified name of DIE in CU. If PHYSNAME is nonzero,
10775 compute the physname for the object, which include a method's:
10776 - formal parameters (C++),
10777 - receiver type (Go),
10779 The term "physname" is a bit confusing.
10780 For C++, for example, it is the demangled name.
10781 For Go, for example, it's the mangled name.
10783 For Ada, return the DIE's linkage name rather than the fully qualified
10784 name. PHYSNAME is ignored..
10786 The result is allocated on the objfile_obstack and canonicalized. */
10788 static const char *
10789 dwarf2_compute_name (const char *name,
10790 struct die_info *die, struct dwarf2_cu *cu,
10793 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
10796 name = dwarf2_name (die, cu);
10798 /* For Fortran GDB prefers DW_AT_*linkage_name for the physname if present
10799 but otherwise compute it by typename_concat inside GDB.
10800 FIXME: Actually this is not really true, or at least not always true.
10801 It's all very confusing. SYMBOL_SET_NAMES doesn't try to demangle
10802 Fortran names because there is no mangling standard. So new_symbol
10803 will set the demangled name to the result of dwarf2_full_name, and it is
10804 the demangled name that GDB uses if it exists. */
10805 if (cu->language == language_ada
10806 || (cu->language == language_fortran && physname))
10808 /* For Ada unit, we prefer the linkage name over the name, as
10809 the former contains the exported name, which the user expects
10810 to be able to reference. Ideally, we want the user to be able
10811 to reference this entity using either natural or linkage name,
10812 but we haven't started looking at this enhancement yet. */
10813 const char *linkage_name = dw2_linkage_name (die, cu);
10815 if (linkage_name != NULL)
10816 return linkage_name;
10819 /* These are the only languages we know how to qualify names in. */
10821 && (cu->language == language_cplus
10822 || cu->language == language_fortran || cu->language == language_d
10823 || cu->language == language_rust))
10825 if (die_needs_namespace (die, cu))
10827 const char *prefix;
10828 const char *canonical_name = NULL;
10832 prefix = determine_prefix (die, cu);
10833 if (*prefix != '\0')
10835 char *prefixed_name = typename_concat (NULL, prefix, name,
10838 buf.puts (prefixed_name);
10839 xfree (prefixed_name);
10844 /* Template parameters may be specified in the DIE's DW_AT_name, or
10845 as children with DW_TAG_template_type_param or
10846 DW_TAG_value_type_param. If the latter, add them to the name
10847 here. If the name already has template parameters, then
10848 skip this step; some versions of GCC emit both, and
10849 it is more efficient to use the pre-computed name.
10851 Something to keep in mind about this process: it is very
10852 unlikely, or in some cases downright impossible, to produce
10853 something that will match the mangled name of a function.
10854 If the definition of the function has the same debug info,
10855 we should be able to match up with it anyway. But fallbacks
10856 using the minimal symbol, for instance to find a method
10857 implemented in a stripped copy of libstdc++, will not work.
10858 If we do not have debug info for the definition, we will have to
10859 match them up some other way.
10861 When we do name matching there is a related problem with function
10862 templates; two instantiated function templates are allowed to
10863 differ only by their return types, which we do not add here. */
10865 if (cu->language == language_cplus && strchr (name, '<') == NULL)
10867 struct attribute *attr;
10868 struct die_info *child;
10871 die->building_fullname = 1;
10873 for (child = die->child; child != NULL; child = child->sibling)
10877 const gdb_byte *bytes;
10878 struct dwarf2_locexpr_baton *baton;
10881 if (child->tag != DW_TAG_template_type_param
10882 && child->tag != DW_TAG_template_value_param)
10893 attr = dwarf2_attr (child, DW_AT_type, cu);
10896 complaint (_("template parameter missing DW_AT_type"));
10897 buf.puts ("UNKNOWN_TYPE");
10900 type = die_type (child, cu);
10902 if (child->tag == DW_TAG_template_type_param)
10904 c_print_type (type, "", &buf, -1, 0, cu->language,
10905 &type_print_raw_options);
10909 attr = dwarf2_attr (child, DW_AT_const_value, cu);
10912 complaint (_("template parameter missing "
10913 "DW_AT_const_value"));
10914 buf.puts ("UNKNOWN_VALUE");
10918 dwarf2_const_value_attr (attr, type, name,
10919 &cu->comp_unit_obstack, cu,
10920 &value, &bytes, &baton);
10922 if (TYPE_NOSIGN (type))
10923 /* GDB prints characters as NUMBER 'CHAR'. If that's
10924 changed, this can use value_print instead. */
10925 c_printchar (value, type, &buf);
10928 struct value_print_options opts;
10931 v = dwarf2_evaluate_loc_desc (type, NULL,
10935 else if (bytes != NULL)
10937 v = allocate_value (type);
10938 memcpy (value_contents_writeable (v), bytes,
10939 TYPE_LENGTH (type));
10942 v = value_from_longest (type, value);
10944 /* Specify decimal so that we do not depend on
10946 get_formatted_print_options (&opts, 'd');
10948 value_print (v, &buf, &opts);
10953 die->building_fullname = 0;
10957 /* Close the argument list, with a space if necessary
10958 (nested templates). */
10959 if (!buf.empty () && buf.string ().back () == '>')
10966 /* For C++ methods, append formal parameter type
10967 information, if PHYSNAME. */
10969 if (physname && die->tag == DW_TAG_subprogram
10970 && cu->language == language_cplus)
10972 struct type *type = read_type_die (die, cu);
10974 c_type_print_args (type, &buf, 1, cu->language,
10975 &type_print_raw_options);
10977 if (cu->language == language_cplus)
10979 /* Assume that an artificial first parameter is
10980 "this", but do not crash if it is not. RealView
10981 marks unnamed (and thus unused) parameters as
10982 artificial; there is no way to differentiate
10984 if (TYPE_NFIELDS (type) > 0
10985 && TYPE_FIELD_ARTIFICIAL (type, 0)
10986 && TYPE_CODE (TYPE_FIELD_TYPE (type, 0)) == TYPE_CODE_PTR
10987 && TYPE_CONST (TYPE_TARGET_TYPE (TYPE_FIELD_TYPE (type,
10989 buf.puts (" const");
10993 const std::string &intermediate_name = buf.string ();
10995 if (cu->language == language_cplus)
10997 = dwarf2_canonicalize_name (intermediate_name.c_str (), cu,
10998 &objfile->per_bfd->storage_obstack);
11000 /* If we only computed INTERMEDIATE_NAME, or if
11001 INTERMEDIATE_NAME is already canonical, then we need to
11002 copy it to the appropriate obstack. */
11003 if (canonical_name == NULL || canonical_name == intermediate_name.c_str ())
11004 name = ((const char *)
11005 obstack_copy0 (&objfile->per_bfd->storage_obstack,
11006 intermediate_name.c_str (),
11007 intermediate_name.length ()));
11009 name = canonical_name;
11016 /* Return the fully qualified name of DIE, based on its DW_AT_name.
11017 If scope qualifiers are appropriate they will be added. The result
11018 will be allocated on the storage_obstack, or NULL if the DIE does
11019 not have a name. NAME may either be from a previous call to
11020 dwarf2_name or NULL.
11022 The output string will be canonicalized (if C++). */
11024 static const char *
11025 dwarf2_full_name (const char *name, struct die_info *die, struct dwarf2_cu *cu)
11027 return dwarf2_compute_name (name, die, cu, 0);
11030 /* Construct a physname for the given DIE in CU. NAME may either be
11031 from a previous call to dwarf2_name or NULL. The result will be
11032 allocated on the objfile_objstack or NULL if the DIE does not have a
11035 The output string will be canonicalized (if C++). */
11037 static const char *
11038 dwarf2_physname (const char *name, struct die_info *die, struct dwarf2_cu *cu)
11040 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
11041 const char *retval, *mangled = NULL, *canon = NULL;
11044 /* In this case dwarf2_compute_name is just a shortcut not building anything
11046 if (!die_needs_namespace (die, cu))
11047 return dwarf2_compute_name (name, die, cu, 1);
11049 mangled = dw2_linkage_name (die, cu);
11051 /* rustc emits invalid values for DW_AT_linkage_name. Ignore these.
11052 See https://github.com/rust-lang/rust/issues/32925. */
11053 if (cu->language == language_rust && mangled != NULL
11054 && strchr (mangled, '{') != NULL)
11057 /* DW_AT_linkage_name is missing in some cases - depend on what GDB
11059 gdb::unique_xmalloc_ptr<char> demangled;
11060 if (mangled != NULL)
11063 if (language_def (cu->language)->la_store_sym_names_in_linkage_form_p)
11065 /* Do nothing (do not demangle the symbol name). */
11067 else if (cu->language == language_go)
11069 /* This is a lie, but we already lie to the caller new_symbol.
11070 new_symbol assumes we return the mangled name.
11071 This just undoes that lie until things are cleaned up. */
11075 /* Use DMGL_RET_DROP for C++ template functions to suppress
11076 their return type. It is easier for GDB users to search
11077 for such functions as `name(params)' than `long name(params)'.
11078 In such case the minimal symbol names do not match the full
11079 symbol names but for template functions there is never a need
11080 to look up their definition from their declaration so
11081 the only disadvantage remains the minimal symbol variant
11082 `long name(params)' does not have the proper inferior type. */
11083 demangled.reset (gdb_demangle (mangled,
11084 (DMGL_PARAMS | DMGL_ANSI
11085 | DMGL_RET_DROP)));
11088 canon = demangled.get ();
11096 if (canon == NULL || check_physname)
11098 const char *physname = dwarf2_compute_name (name, die, cu, 1);
11100 if (canon != NULL && strcmp (physname, canon) != 0)
11102 /* It may not mean a bug in GDB. The compiler could also
11103 compute DW_AT_linkage_name incorrectly. But in such case
11104 GDB would need to be bug-to-bug compatible. */
11106 complaint (_("Computed physname <%s> does not match demangled <%s> "
11107 "(from linkage <%s>) - DIE at %s [in module %s]"),
11108 physname, canon, mangled, sect_offset_str (die->sect_off),
11109 objfile_name (objfile));
11111 /* Prefer DW_AT_linkage_name (in the CANON form) - when it
11112 is available here - over computed PHYSNAME. It is safer
11113 against both buggy GDB and buggy compilers. */
11127 retval = ((const char *)
11128 obstack_copy0 (&objfile->per_bfd->storage_obstack,
11129 retval, strlen (retval)));
11134 /* Inspect DIE in CU for a namespace alias. If one exists, record
11135 a new symbol for it.
11137 Returns 1 if a namespace alias was recorded, 0 otherwise. */
11140 read_namespace_alias (struct die_info *die, struct dwarf2_cu *cu)
11142 struct attribute *attr;
11144 /* If the die does not have a name, this is not a namespace
11146 attr = dwarf2_attr (die, DW_AT_name, cu);
11150 struct die_info *d = die;
11151 struct dwarf2_cu *imported_cu = cu;
11153 /* If the compiler has nested DW_AT_imported_declaration DIEs,
11154 keep inspecting DIEs until we hit the underlying import. */
11155 #define MAX_NESTED_IMPORTED_DECLARATIONS 100
11156 for (num = 0; num < MAX_NESTED_IMPORTED_DECLARATIONS; ++num)
11158 attr = dwarf2_attr (d, DW_AT_import, cu);
11162 d = follow_die_ref (d, attr, &imported_cu);
11163 if (d->tag != DW_TAG_imported_declaration)
11167 if (num == MAX_NESTED_IMPORTED_DECLARATIONS)
11169 complaint (_("DIE at %s has too many recursively imported "
11170 "declarations"), sect_offset_str (d->sect_off));
11177 sect_offset sect_off = dwarf2_get_ref_die_offset (attr);
11179 type = get_die_type_at_offset (sect_off, cu->per_cu);
11180 if (type != NULL && TYPE_CODE (type) == TYPE_CODE_NAMESPACE)
11182 /* This declaration is a global namespace alias. Add
11183 a symbol for it whose type is the aliased namespace. */
11184 new_symbol (die, type, cu);
11193 /* Return the using directives repository (global or local?) to use in the
11194 current context for CU.
11196 For Ada, imported declarations can materialize renamings, which *may* be
11197 global. However it is impossible (for now?) in DWARF to distinguish
11198 "external" imported declarations and "static" ones. As all imported
11199 declarations seem to be static in all other languages, make them all CU-wide
11200 global only in Ada. */
11202 static struct using_direct **
11203 using_directives (struct dwarf2_cu *cu)
11205 if (cu->language == language_ada
11206 && cu->get_builder ()->outermost_context_p ())
11207 return cu->get_builder ()->get_global_using_directives ();
11209 return cu->get_builder ()->get_local_using_directives ();
11212 /* Read the import statement specified by the given die and record it. */
11215 read_import_statement (struct die_info *die, struct dwarf2_cu *cu)
11217 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
11218 struct attribute *import_attr;
11219 struct die_info *imported_die, *child_die;
11220 struct dwarf2_cu *imported_cu;
11221 const char *imported_name;
11222 const char *imported_name_prefix;
11223 const char *canonical_name;
11224 const char *import_alias;
11225 const char *imported_declaration = NULL;
11226 const char *import_prefix;
11227 std::vector<const char *> excludes;
11229 import_attr = dwarf2_attr (die, DW_AT_import, cu);
11230 if (import_attr == NULL)
11232 complaint (_("Tag '%s' has no DW_AT_import"),
11233 dwarf_tag_name (die->tag));
11238 imported_die = follow_die_ref_or_sig (die, import_attr, &imported_cu);
11239 imported_name = dwarf2_name (imported_die, imported_cu);
11240 if (imported_name == NULL)
11242 /* GCC bug: https://bugzilla.redhat.com/show_bug.cgi?id=506524
11244 The import in the following code:
11258 <2><51>: Abbrev Number: 3 (DW_TAG_imported_declaration)
11259 <52> DW_AT_decl_file : 1
11260 <53> DW_AT_decl_line : 6
11261 <54> DW_AT_import : <0x75>
11262 <2><58>: Abbrev Number: 4 (DW_TAG_typedef)
11263 <59> DW_AT_name : B
11264 <5b> DW_AT_decl_file : 1
11265 <5c> DW_AT_decl_line : 2
11266 <5d> DW_AT_type : <0x6e>
11268 <1><75>: Abbrev Number: 7 (DW_TAG_base_type)
11269 <76> DW_AT_byte_size : 4
11270 <77> DW_AT_encoding : 5 (signed)
11272 imports the wrong die ( 0x75 instead of 0x58 ).
11273 This case will be ignored until the gcc bug is fixed. */
11277 /* Figure out the local name after import. */
11278 import_alias = dwarf2_name (die, cu);
11280 /* Figure out where the statement is being imported to. */
11281 import_prefix = determine_prefix (die, cu);
11283 /* Figure out what the scope of the imported die is and prepend it
11284 to the name of the imported die. */
11285 imported_name_prefix = determine_prefix (imported_die, imported_cu);
11287 if (imported_die->tag != DW_TAG_namespace
11288 && imported_die->tag != DW_TAG_module)
11290 imported_declaration = imported_name;
11291 canonical_name = imported_name_prefix;
11293 else if (strlen (imported_name_prefix) > 0)
11294 canonical_name = obconcat (&objfile->objfile_obstack,
11295 imported_name_prefix,
11296 (cu->language == language_d ? "." : "::"),
11297 imported_name, (char *) NULL);
11299 canonical_name = imported_name;
11301 if (die->tag == DW_TAG_imported_module && cu->language == language_fortran)
11302 for (child_die = die->child; child_die && child_die->tag;
11303 child_die = sibling_die (child_die))
11305 /* DWARF-4: A Fortran use statement with a “rename list” may be
11306 represented by an imported module entry with an import attribute
11307 referring to the module and owned entries corresponding to those
11308 entities that are renamed as part of being imported. */
11310 if (child_die->tag != DW_TAG_imported_declaration)
11312 complaint (_("child DW_TAG_imported_declaration expected "
11313 "- DIE at %s [in module %s]"),
11314 sect_offset_str (child_die->sect_off),
11315 objfile_name (objfile));
11319 import_attr = dwarf2_attr (child_die, DW_AT_import, cu);
11320 if (import_attr == NULL)
11322 complaint (_("Tag '%s' has no DW_AT_import"),
11323 dwarf_tag_name (child_die->tag));
11328 imported_die = follow_die_ref_or_sig (child_die, import_attr,
11330 imported_name = dwarf2_name (imported_die, imported_cu);
11331 if (imported_name == NULL)
11333 complaint (_("child DW_TAG_imported_declaration has unknown "
11334 "imported name - DIE at %s [in module %s]"),
11335 sect_offset_str (child_die->sect_off),
11336 objfile_name (objfile));
11340 excludes.push_back (imported_name);
11342 process_die (child_die, cu);
11345 add_using_directive (using_directives (cu),
11349 imported_declaration,
11352 &objfile->objfile_obstack);
11355 /* ICC<14 does not output the required DW_AT_declaration on incomplete
11356 types, but gives them a size of zero. Starting with version 14,
11357 ICC is compatible with GCC. */
11360 producer_is_icc_lt_14 (struct dwarf2_cu *cu)
11362 if (!cu->checked_producer)
11363 check_producer (cu);
11365 return cu->producer_is_icc_lt_14;
11368 /* ICC generates a DW_AT_type for C void functions. This was observed on
11369 ICC 14.0.5.212, and appears to be against the DWARF spec (V5 3.3.2)
11370 which says that void functions should not have a DW_AT_type. */
11373 producer_is_icc (struct dwarf2_cu *cu)
11375 if (!cu->checked_producer)
11376 check_producer (cu);
11378 return cu->producer_is_icc;
11381 /* Check for possibly missing DW_AT_comp_dir with relative .debug_line
11382 directory paths. GCC SVN r127613 (new option -fdebug-prefix-map) fixed
11383 this, it was first present in GCC release 4.3.0. */
11386 producer_is_gcc_lt_4_3 (struct dwarf2_cu *cu)
11388 if (!cu->checked_producer)
11389 check_producer (cu);
11391 return cu->producer_is_gcc_lt_4_3;
11394 static file_and_directory
11395 find_file_and_directory (struct die_info *die, struct dwarf2_cu *cu)
11397 file_and_directory res;
11399 /* Find the filename. Do not use dwarf2_name here, since the filename
11400 is not a source language identifier. */
11401 res.name = dwarf2_string_attr (die, DW_AT_name, cu);
11402 res.comp_dir = dwarf2_string_attr (die, DW_AT_comp_dir, cu);
11404 if (res.comp_dir == NULL
11405 && producer_is_gcc_lt_4_3 (cu) && res.name != NULL
11406 && IS_ABSOLUTE_PATH (res.name))
11408 res.comp_dir_storage = ldirname (res.name);
11409 if (!res.comp_dir_storage.empty ())
11410 res.comp_dir = res.comp_dir_storage.c_str ();
11412 if (res.comp_dir != NULL)
11414 /* Irix 6.2 native cc prepends <machine>.: to the compilation
11415 directory, get rid of it. */
11416 const char *cp = strchr (res.comp_dir, ':');
11418 if (cp && cp != res.comp_dir && cp[-1] == '.' && cp[1] == '/')
11419 res.comp_dir = cp + 1;
11422 if (res.name == NULL)
11423 res.name = "<unknown>";
11428 /* Handle DW_AT_stmt_list for a compilation unit.
11429 DIE is the DW_TAG_compile_unit die for CU.
11430 COMP_DIR is the compilation directory. LOWPC is passed to
11431 dwarf_decode_lines. See dwarf_decode_lines comments about it. */
11434 handle_DW_AT_stmt_list (struct die_info *die, struct dwarf2_cu *cu,
11435 const char *comp_dir, CORE_ADDR lowpc) /* ARI: editCase function */
11437 struct dwarf2_per_objfile *dwarf2_per_objfile
11438 = cu->per_cu->dwarf2_per_objfile;
11439 struct objfile *objfile = dwarf2_per_objfile->objfile;
11440 struct attribute *attr;
11441 struct line_header line_header_local;
11442 hashval_t line_header_local_hash;
11444 int decode_mapping;
11446 gdb_assert (! cu->per_cu->is_debug_types);
11448 attr = dwarf2_attr (die, DW_AT_stmt_list, cu);
11452 sect_offset line_offset = (sect_offset) DW_UNSND (attr);
11454 /* The line header hash table is only created if needed (it exists to
11455 prevent redundant reading of the line table for partial_units).
11456 If we're given a partial_unit, we'll need it. If we're given a
11457 compile_unit, then use the line header hash table if it's already
11458 created, but don't create one just yet. */
11460 if (dwarf2_per_objfile->line_header_hash == NULL
11461 && die->tag == DW_TAG_partial_unit)
11463 dwarf2_per_objfile->line_header_hash
11464 = htab_create_alloc_ex (127, line_header_hash_voidp,
11465 line_header_eq_voidp,
11466 free_line_header_voidp,
11467 &objfile->objfile_obstack,
11468 hashtab_obstack_allocate,
11469 dummy_obstack_deallocate);
11472 line_header_local.sect_off = line_offset;
11473 line_header_local.offset_in_dwz = cu->per_cu->is_dwz;
11474 line_header_local_hash = line_header_hash (&line_header_local);
11475 if (dwarf2_per_objfile->line_header_hash != NULL)
11477 slot = htab_find_slot_with_hash (dwarf2_per_objfile->line_header_hash,
11478 &line_header_local,
11479 line_header_local_hash, NO_INSERT);
11481 /* For DW_TAG_compile_unit we need info like symtab::linetable which
11482 is not present in *SLOT (since if there is something in *SLOT then
11483 it will be for a partial_unit). */
11484 if (die->tag == DW_TAG_partial_unit && slot != NULL)
11486 gdb_assert (*slot != NULL);
11487 cu->line_header = (struct line_header *) *slot;
11492 /* dwarf_decode_line_header does not yet provide sufficient information.
11493 We always have to call also dwarf_decode_lines for it. */
11494 line_header_up lh = dwarf_decode_line_header (line_offset, cu);
11498 cu->line_header = lh.release ();
11499 cu->line_header_die_owner = die;
11501 if (dwarf2_per_objfile->line_header_hash == NULL)
11505 slot = htab_find_slot_with_hash (dwarf2_per_objfile->line_header_hash,
11506 &line_header_local,
11507 line_header_local_hash, INSERT);
11508 gdb_assert (slot != NULL);
11510 if (slot != NULL && *slot == NULL)
11512 /* This newly decoded line number information unit will be owned
11513 by line_header_hash hash table. */
11514 *slot = cu->line_header;
11515 cu->line_header_die_owner = NULL;
11519 /* We cannot free any current entry in (*slot) as that struct line_header
11520 may be already used by multiple CUs. Create only temporary decoded
11521 line_header for this CU - it may happen at most once for each line
11522 number information unit. And if we're not using line_header_hash
11523 then this is what we want as well. */
11524 gdb_assert (die->tag != DW_TAG_partial_unit);
11526 decode_mapping = (die->tag != DW_TAG_partial_unit);
11527 dwarf_decode_lines (cu->line_header, comp_dir, cu, NULL, lowpc,
11532 /* Process DW_TAG_compile_unit or DW_TAG_partial_unit. */
11535 read_file_scope (struct die_info *die, struct dwarf2_cu *cu)
11537 struct dwarf2_per_objfile *dwarf2_per_objfile
11538 = cu->per_cu->dwarf2_per_objfile;
11539 struct objfile *objfile = dwarf2_per_objfile->objfile;
11540 struct gdbarch *gdbarch = get_objfile_arch (objfile);
11541 CORE_ADDR lowpc = ((CORE_ADDR) -1);
11542 CORE_ADDR highpc = ((CORE_ADDR) 0);
11543 struct attribute *attr;
11544 struct die_info *child_die;
11545 CORE_ADDR baseaddr;
11547 prepare_one_comp_unit (cu, die, cu->language);
11548 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
11550 get_scope_pc_bounds (die, &lowpc, &highpc, cu);
11552 /* If we didn't find a lowpc, set it to highpc to avoid complaints
11553 from finish_block. */
11554 if (lowpc == ((CORE_ADDR) -1))
11556 lowpc = gdbarch_adjust_dwarf2_addr (gdbarch, lowpc + baseaddr);
11558 file_and_directory fnd = find_file_and_directory (die, cu);
11560 /* The XLCL doesn't generate DW_LANG_OpenCL because this attribute is not
11561 standardised yet. As a workaround for the language detection we fall
11562 back to the DW_AT_producer string. */
11563 if (cu->producer && strstr (cu->producer, "IBM XL C for OpenCL") != NULL)
11564 cu->language = language_opencl;
11566 /* Similar hack for Go. */
11567 if (cu->producer && strstr (cu->producer, "GNU Go ") != NULL)
11568 set_cu_language (DW_LANG_Go, cu);
11570 cu->start_symtab (fnd.name, fnd.comp_dir, lowpc);
11572 /* Decode line number information if present. We do this before
11573 processing child DIEs, so that the line header table is available
11574 for DW_AT_decl_file. */
11575 handle_DW_AT_stmt_list (die, cu, fnd.comp_dir, lowpc);
11577 /* Process all dies in compilation unit. */
11578 if (die->child != NULL)
11580 child_die = die->child;
11581 while (child_die && child_die->tag)
11583 process_die (child_die, cu);
11584 child_die = sibling_die (child_die);
11588 /* Decode macro information, if present. Dwarf 2 macro information
11589 refers to information in the line number info statement program
11590 header, so we can only read it if we've read the header
11592 attr = dwarf2_attr (die, DW_AT_macros, cu);
11594 attr = dwarf2_attr (die, DW_AT_GNU_macros, cu);
11595 if (attr && cu->line_header)
11597 if (dwarf2_attr (die, DW_AT_macro_info, cu))
11598 complaint (_("CU refers to both DW_AT_macros and DW_AT_macro_info"));
11600 dwarf_decode_macros (cu, DW_UNSND (attr), 1);
11604 attr = dwarf2_attr (die, DW_AT_macro_info, cu);
11605 if (attr && cu->line_header)
11607 unsigned int macro_offset = DW_UNSND (attr);
11609 dwarf_decode_macros (cu, macro_offset, 0);
11615 dwarf2_cu::setup_type_unit_groups (struct die_info *die)
11617 struct type_unit_group *tu_group;
11619 struct attribute *attr;
11621 struct signatured_type *sig_type;
11623 gdb_assert (per_cu->is_debug_types);
11624 sig_type = (struct signatured_type *) per_cu;
11626 attr = dwarf2_attr (die, DW_AT_stmt_list, this);
11628 /* If we're using .gdb_index (includes -readnow) then
11629 per_cu->type_unit_group may not have been set up yet. */
11630 if (sig_type->type_unit_group == NULL)
11631 sig_type->type_unit_group = get_type_unit_group (this, attr);
11632 tu_group = sig_type->type_unit_group;
11634 /* If we've already processed this stmt_list there's no real need to
11635 do it again, we could fake it and just recreate the part we need
11636 (file name,index -> symtab mapping). If data shows this optimization
11637 is useful we can do it then. */
11638 first_time = tu_group->compunit_symtab == NULL;
11640 /* We have to handle the case of both a missing DW_AT_stmt_list or bad
11645 sect_offset line_offset = (sect_offset) DW_UNSND (attr);
11646 lh = dwarf_decode_line_header (line_offset, this);
11651 start_symtab ("", NULL, 0);
11654 gdb_assert (tu_group->symtabs == NULL);
11655 gdb_assert (m_builder == nullptr);
11656 struct compunit_symtab *cust = tu_group->compunit_symtab;
11657 m_builder.reset (new struct buildsym_compunit
11658 (COMPUNIT_OBJFILE (cust), "",
11659 COMPUNIT_DIRNAME (cust),
11660 compunit_language (cust),
11666 line_header = lh.release ();
11667 line_header_die_owner = die;
11671 struct compunit_symtab *cust = start_symtab ("", NULL, 0);
11673 /* Note: We don't assign tu_group->compunit_symtab yet because we're
11674 still initializing it, and our caller (a few levels up)
11675 process_full_type_unit still needs to know if this is the first
11678 tu_group->num_symtabs = line_header->file_names.size ();
11679 tu_group->symtabs = XNEWVEC (struct symtab *,
11680 line_header->file_names.size ());
11682 for (i = 0; i < line_header->file_names.size (); ++i)
11684 file_entry &fe = line_header->file_names[i];
11686 dwarf2_start_subfile (this, fe.name,
11687 fe.include_dir (line_header));
11688 buildsym_compunit *b = get_builder ();
11689 if (b->get_current_subfile ()->symtab == NULL)
11691 /* NOTE: start_subfile will recognize when it's been
11692 passed a file it has already seen. So we can't
11693 assume there's a simple mapping from
11694 cu->line_header->file_names to subfiles, plus
11695 cu->line_header->file_names may contain dups. */
11696 b->get_current_subfile ()->symtab
11697 = allocate_symtab (cust, b->get_current_subfile ()->name);
11700 fe.symtab = b->get_current_subfile ()->symtab;
11701 tu_group->symtabs[i] = fe.symtab;
11706 gdb_assert (m_builder == nullptr);
11707 struct compunit_symtab *cust = tu_group->compunit_symtab;
11708 m_builder.reset (new struct buildsym_compunit
11709 (COMPUNIT_OBJFILE (cust), "",
11710 COMPUNIT_DIRNAME (cust),
11711 compunit_language (cust),
11714 for (i = 0; i < line_header->file_names.size (); ++i)
11716 file_entry &fe = line_header->file_names[i];
11718 fe.symtab = tu_group->symtabs[i];
11722 /* The main symtab is allocated last. Type units don't have DW_AT_name
11723 so they don't have a "real" (so to speak) symtab anyway.
11724 There is later code that will assign the main symtab to all symbols
11725 that don't have one. We need to handle the case of a symbol with a
11726 missing symtab (DW_AT_decl_file) anyway. */
11729 /* Process DW_TAG_type_unit.
11730 For TUs we want to skip the first top level sibling if it's not the
11731 actual type being defined by this TU. In this case the first top
11732 level sibling is there to provide context only. */
11735 read_type_unit_scope (struct die_info *die, struct dwarf2_cu *cu)
11737 struct die_info *child_die;
11739 prepare_one_comp_unit (cu, die, language_minimal);
11741 /* Initialize (or reinitialize) the machinery for building symtabs.
11742 We do this before processing child DIEs, so that the line header table
11743 is available for DW_AT_decl_file. */
11744 cu->setup_type_unit_groups (die);
11746 if (die->child != NULL)
11748 child_die = die->child;
11749 while (child_die && child_die->tag)
11751 process_die (child_die, cu);
11752 child_die = sibling_die (child_die);
11759 http://gcc.gnu.org/wiki/DebugFission
11760 http://gcc.gnu.org/wiki/DebugFissionDWP
11762 To simplify handling of both DWO files ("object" files with the DWARF info)
11763 and DWP files (a file with the DWOs packaged up into one file), we treat
11764 DWP files as having a collection of virtual DWO files. */
11767 hash_dwo_file (const void *item)
11769 const struct dwo_file *dwo_file = (const struct dwo_file *) item;
11772 hash = htab_hash_string (dwo_file->dwo_name);
11773 if (dwo_file->comp_dir != NULL)
11774 hash += htab_hash_string (dwo_file->comp_dir);
11779 eq_dwo_file (const void *item_lhs, const void *item_rhs)
11781 const struct dwo_file *lhs = (const struct dwo_file *) item_lhs;
11782 const struct dwo_file *rhs = (const struct dwo_file *) item_rhs;
11784 if (strcmp (lhs->dwo_name, rhs->dwo_name) != 0)
11786 if (lhs->comp_dir == NULL || rhs->comp_dir == NULL)
11787 return lhs->comp_dir == rhs->comp_dir;
11788 return strcmp (lhs->comp_dir, rhs->comp_dir) == 0;
11791 /* Allocate a hash table for DWO files. */
11794 allocate_dwo_file_hash_table (struct objfile *objfile)
11796 return htab_create_alloc_ex (41,
11800 &objfile->objfile_obstack,
11801 hashtab_obstack_allocate,
11802 dummy_obstack_deallocate);
11805 /* Lookup DWO file DWO_NAME. */
11808 lookup_dwo_file_slot (struct dwarf2_per_objfile *dwarf2_per_objfile,
11809 const char *dwo_name,
11810 const char *comp_dir)
11812 struct dwo_file find_entry;
11815 if (dwarf2_per_objfile->dwo_files == NULL)
11816 dwarf2_per_objfile->dwo_files
11817 = allocate_dwo_file_hash_table (dwarf2_per_objfile->objfile);
11819 memset (&find_entry, 0, sizeof (find_entry));
11820 find_entry.dwo_name = dwo_name;
11821 find_entry.comp_dir = comp_dir;
11822 slot = htab_find_slot (dwarf2_per_objfile->dwo_files, &find_entry, INSERT);
11828 hash_dwo_unit (const void *item)
11830 const struct dwo_unit *dwo_unit = (const struct dwo_unit *) item;
11832 /* This drops the top 32 bits of the id, but is ok for a hash. */
11833 return dwo_unit->signature;
11837 eq_dwo_unit (const void *item_lhs, const void *item_rhs)
11839 const struct dwo_unit *lhs = (const struct dwo_unit *) item_lhs;
11840 const struct dwo_unit *rhs = (const struct dwo_unit *) item_rhs;
11842 /* The signature is assumed to be unique within the DWO file.
11843 So while object file CU dwo_id's always have the value zero,
11844 that's OK, assuming each object file DWO file has only one CU,
11845 and that's the rule for now. */
11846 return lhs->signature == rhs->signature;
11849 /* Allocate a hash table for DWO CUs,TUs.
11850 There is one of these tables for each of CUs,TUs for each DWO file. */
11853 allocate_dwo_unit_table (struct objfile *objfile)
11855 /* Start out with a pretty small number.
11856 Generally DWO files contain only one CU and maybe some TUs. */
11857 return htab_create_alloc_ex (3,
11861 &objfile->objfile_obstack,
11862 hashtab_obstack_allocate,
11863 dummy_obstack_deallocate);
11866 /* Structure used to pass data to create_dwo_debug_info_hash_table_reader. */
11868 struct create_dwo_cu_data
11870 struct dwo_file *dwo_file;
11871 struct dwo_unit dwo_unit;
11874 /* die_reader_func for create_dwo_cu. */
11877 create_dwo_cu_reader (const struct die_reader_specs *reader,
11878 const gdb_byte *info_ptr,
11879 struct die_info *comp_unit_die,
11883 struct dwarf2_cu *cu = reader->cu;
11884 sect_offset sect_off = cu->per_cu->sect_off;
11885 struct dwarf2_section_info *section = cu->per_cu->section;
11886 struct create_dwo_cu_data *data = (struct create_dwo_cu_data *) datap;
11887 struct dwo_file *dwo_file = data->dwo_file;
11888 struct dwo_unit *dwo_unit = &data->dwo_unit;
11889 struct attribute *attr;
11891 attr = dwarf2_attr (comp_unit_die, DW_AT_GNU_dwo_id, cu);
11894 complaint (_("Dwarf Error: debug entry at offset %s is missing"
11895 " its dwo_id [in module %s]"),
11896 sect_offset_str (sect_off), dwo_file->dwo_name);
11900 dwo_unit->dwo_file = dwo_file;
11901 dwo_unit->signature = DW_UNSND (attr);
11902 dwo_unit->section = section;
11903 dwo_unit->sect_off = sect_off;
11904 dwo_unit->length = cu->per_cu->length;
11906 if (dwarf_read_debug)
11907 fprintf_unfiltered (gdb_stdlog, " offset %s, dwo_id %s\n",
11908 sect_offset_str (sect_off),
11909 hex_string (dwo_unit->signature));
11912 /* Create the dwo_units for the CUs in a DWO_FILE.
11913 Note: This function processes DWO files only, not DWP files. */
11916 create_cus_hash_table (struct dwarf2_per_objfile *dwarf2_per_objfile,
11917 struct dwo_file &dwo_file, dwarf2_section_info §ion,
11920 struct objfile *objfile = dwarf2_per_objfile->objfile;
11921 const gdb_byte *info_ptr, *end_ptr;
11923 dwarf2_read_section (objfile, §ion);
11924 info_ptr = section.buffer;
11926 if (info_ptr == NULL)
11929 if (dwarf_read_debug)
11931 fprintf_unfiltered (gdb_stdlog, "Reading %s for %s:\n",
11932 get_section_name (§ion),
11933 get_section_file_name (§ion));
11936 end_ptr = info_ptr + section.size;
11937 while (info_ptr < end_ptr)
11939 struct dwarf2_per_cu_data per_cu;
11940 struct create_dwo_cu_data create_dwo_cu_data;
11941 struct dwo_unit *dwo_unit;
11943 sect_offset sect_off = (sect_offset) (info_ptr - section.buffer);
11945 memset (&create_dwo_cu_data.dwo_unit, 0,
11946 sizeof (create_dwo_cu_data.dwo_unit));
11947 memset (&per_cu, 0, sizeof (per_cu));
11948 per_cu.dwarf2_per_objfile = dwarf2_per_objfile;
11949 per_cu.is_debug_types = 0;
11950 per_cu.sect_off = sect_offset (info_ptr - section.buffer);
11951 per_cu.section = §ion;
11952 create_dwo_cu_data.dwo_file = &dwo_file;
11954 init_cutu_and_read_dies_no_follow (
11955 &per_cu, &dwo_file, create_dwo_cu_reader, &create_dwo_cu_data);
11956 info_ptr += per_cu.length;
11958 // If the unit could not be parsed, skip it.
11959 if (create_dwo_cu_data.dwo_unit.dwo_file == NULL)
11962 if (cus_htab == NULL)
11963 cus_htab = allocate_dwo_unit_table (objfile);
11965 dwo_unit = OBSTACK_ZALLOC (&objfile->objfile_obstack, struct dwo_unit);
11966 *dwo_unit = create_dwo_cu_data.dwo_unit;
11967 slot = htab_find_slot (cus_htab, dwo_unit, INSERT);
11968 gdb_assert (slot != NULL);
11971 const struct dwo_unit *dup_cu = (const struct dwo_unit *)*slot;
11972 sect_offset dup_sect_off = dup_cu->sect_off;
11974 complaint (_("debug cu entry at offset %s is duplicate to"
11975 " the entry at offset %s, signature %s"),
11976 sect_offset_str (sect_off), sect_offset_str (dup_sect_off),
11977 hex_string (dwo_unit->signature));
11979 *slot = (void *)dwo_unit;
11983 /* DWP file .debug_{cu,tu}_index section format:
11984 [ref: http://gcc.gnu.org/wiki/DebugFissionDWP]
11988 Both index sections have the same format, and serve to map a 64-bit
11989 signature to a set of section numbers. Each section begins with a header,
11990 followed by a hash table of 64-bit signatures, a parallel table of 32-bit
11991 indexes, and a pool of 32-bit section numbers. The index sections will be
11992 aligned at 8-byte boundaries in the file.
11994 The index section header consists of:
11996 V, 32 bit version number
11998 N, 32 bit number of compilation units or type units in the index
11999 M, 32 bit number of slots in the hash table
12001 Numbers are recorded using the byte order of the application binary.
12003 The hash table begins at offset 16 in the section, and consists of an array
12004 of M 64-bit slots. Each slot contains a 64-bit signature (using the byte
12005 order of the application binary). Unused slots in the hash table are 0.
12006 (We rely on the extreme unlikeliness of a signature being exactly 0.)
12008 The parallel table begins immediately after the hash table
12009 (at offset 16 + 8 * M from the beginning of the section), and consists of an
12010 array of 32-bit indexes (using the byte order of the application binary),
12011 corresponding 1-1 with slots in the hash table. Each entry in the parallel
12012 table contains a 32-bit index into the pool of section numbers. For unused
12013 hash table slots, the corresponding entry in the parallel table will be 0.
12015 The pool of section numbers begins immediately following the hash table
12016 (at offset 16 + 12 * M from the beginning of the section). The pool of
12017 section numbers consists of an array of 32-bit words (using the byte order
12018 of the application binary). Each item in the array is indexed starting
12019 from 0. The hash table entry provides the index of the first section
12020 number in the set. Additional section numbers in the set follow, and the
12021 set is terminated by a 0 entry (section number 0 is not used in ELF).
12023 In each set of section numbers, the .debug_info.dwo or .debug_types.dwo
12024 section must be the first entry in the set, and the .debug_abbrev.dwo must
12025 be the second entry. Other members of the set may follow in any order.
12031 DWP Version 2 combines all the .debug_info, etc. sections into one,
12032 and the entries in the index tables are now offsets into these sections.
12033 CU offsets begin at 0. TU offsets begin at the size of the .debug_info
12036 Index Section Contents:
12038 Hash Table of Signatures dwp_hash_table.hash_table
12039 Parallel Table of Indices dwp_hash_table.unit_table
12040 Table of Section Offsets dwp_hash_table.v2.{section_ids,offsets}
12041 Table of Section Sizes dwp_hash_table.v2.sizes
12043 The index section header consists of:
12045 V, 32 bit version number
12046 L, 32 bit number of columns in the table of section offsets
12047 N, 32 bit number of compilation units or type units in the index
12048 M, 32 bit number of slots in the hash table
12050 Numbers are recorded using the byte order of the application binary.
12052 The hash table has the same format as version 1.
12053 The parallel table of indices has the same format as version 1,
12054 except that the entries are origin-1 indices into the table of sections
12055 offsets and the table of section sizes.
12057 The table of offsets begins immediately following the parallel table
12058 (at offset 16 + 12 * M from the beginning of the section). The table is
12059 a two-dimensional array of 32-bit words (using the byte order of the
12060 application binary), with L columns and N+1 rows, in row-major order.
12061 Each row in the array is indexed starting from 0. The first row provides
12062 a key to the remaining rows: each column in this row provides an identifier
12063 for a debug section, and the offsets in the same column of subsequent rows
12064 refer to that section. The section identifiers are:
12066 DW_SECT_INFO 1 .debug_info.dwo
12067 DW_SECT_TYPES 2 .debug_types.dwo
12068 DW_SECT_ABBREV 3 .debug_abbrev.dwo
12069 DW_SECT_LINE 4 .debug_line.dwo
12070 DW_SECT_LOC 5 .debug_loc.dwo
12071 DW_SECT_STR_OFFSETS 6 .debug_str_offsets.dwo
12072 DW_SECT_MACINFO 7 .debug_macinfo.dwo
12073 DW_SECT_MACRO 8 .debug_macro.dwo
12075 The offsets provided by the CU and TU index sections are the base offsets
12076 for the contributions made by each CU or TU to the corresponding section
12077 in the package file. Each CU and TU header contains an abbrev_offset
12078 field, used to find the abbreviations table for that CU or TU within the
12079 contribution to the .debug_abbrev.dwo section for that CU or TU, and should
12080 be interpreted as relative to the base offset given in the index section.
12081 Likewise, offsets into .debug_line.dwo from DW_AT_stmt_list attributes
12082 should be interpreted as relative to the base offset for .debug_line.dwo,
12083 and offsets into other debug sections obtained from DWARF attributes should
12084 also be interpreted as relative to the corresponding base offset.
12086 The table of sizes begins immediately following the table of offsets.
12087 Like the table of offsets, it is a two-dimensional array of 32-bit words,
12088 with L columns and N rows, in row-major order. Each row in the array is
12089 indexed starting from 1 (row 0 is shared by the two tables).
12093 Hash table lookup is handled the same in version 1 and 2:
12095 We assume that N and M will not exceed 2^32 - 1.
12096 The size of the hash table, M, must be 2^k such that 2^k > 3*N/2.
12098 Given a 64-bit compilation unit signature or a type signature S, an entry
12099 in the hash table is located as follows:
12101 1) Calculate a primary hash H = S & MASK(k), where MASK(k) is a mask with
12102 the low-order k bits all set to 1.
12104 2) Calculate a secondary hash H' = (((S >> 32) & MASK(k)) | 1).
12106 3) If the hash table entry at index H matches the signature, use that
12107 entry. If the hash table entry at index H is unused (all zeroes),
12108 terminate the search: the signature is not present in the table.
12110 4) Let H = (H + H') modulo M. Repeat at Step 3.
12112 Because M > N and H' and M are relatively prime, the search is guaranteed
12113 to stop at an unused slot or find the match. */
12115 /* Create a hash table to map DWO IDs to their CU/TU entry in
12116 .debug_{info,types}.dwo in DWP_FILE.
12117 Returns NULL if there isn't one.
12118 Note: This function processes DWP files only, not DWO files. */
12120 static struct dwp_hash_table *
12121 create_dwp_hash_table (struct dwarf2_per_objfile *dwarf2_per_objfile,
12122 struct dwp_file *dwp_file, int is_debug_types)
12124 struct objfile *objfile = dwarf2_per_objfile->objfile;
12125 bfd *dbfd = dwp_file->dbfd.get ();
12126 const gdb_byte *index_ptr, *index_end;
12127 struct dwarf2_section_info *index;
12128 uint32_t version, nr_columns, nr_units, nr_slots;
12129 struct dwp_hash_table *htab;
12131 if (is_debug_types)
12132 index = &dwp_file->sections.tu_index;
12134 index = &dwp_file->sections.cu_index;
12136 if (dwarf2_section_empty_p (index))
12138 dwarf2_read_section (objfile, index);
12140 index_ptr = index->buffer;
12141 index_end = index_ptr + index->size;
12143 version = read_4_bytes (dbfd, index_ptr);
12146 nr_columns = read_4_bytes (dbfd, index_ptr);
12150 nr_units = read_4_bytes (dbfd, index_ptr);
12152 nr_slots = read_4_bytes (dbfd, index_ptr);
12155 if (version != 1 && version != 2)
12157 error (_("Dwarf Error: unsupported DWP file version (%s)"
12158 " [in module %s]"),
12159 pulongest (version), dwp_file->name);
12161 if (nr_slots != (nr_slots & -nr_slots))
12163 error (_("Dwarf Error: number of slots in DWP hash table (%s)"
12164 " is not power of 2 [in module %s]"),
12165 pulongest (nr_slots), dwp_file->name);
12168 htab = OBSTACK_ZALLOC (&objfile->objfile_obstack, struct dwp_hash_table);
12169 htab->version = version;
12170 htab->nr_columns = nr_columns;
12171 htab->nr_units = nr_units;
12172 htab->nr_slots = nr_slots;
12173 htab->hash_table = index_ptr;
12174 htab->unit_table = htab->hash_table + sizeof (uint64_t) * nr_slots;
12176 /* Exit early if the table is empty. */
12177 if (nr_slots == 0 || nr_units == 0
12178 || (version == 2 && nr_columns == 0))
12180 /* All must be zero. */
12181 if (nr_slots != 0 || nr_units != 0
12182 || (version == 2 && nr_columns != 0))
12184 complaint (_("Empty DWP but nr_slots,nr_units,nr_columns not"
12185 " all zero [in modules %s]"),
12193 htab->section_pool.v1.indices =
12194 htab->unit_table + sizeof (uint32_t) * nr_slots;
12195 /* It's harder to decide whether the section is too small in v1.
12196 V1 is deprecated anyway so we punt. */
12200 const gdb_byte *ids_ptr = htab->unit_table + sizeof (uint32_t) * nr_slots;
12201 int *ids = htab->section_pool.v2.section_ids;
12202 size_t sizeof_ids = sizeof (htab->section_pool.v2.section_ids);
12203 /* Reverse map for error checking. */
12204 int ids_seen[DW_SECT_MAX + 1];
12207 if (nr_columns < 2)
12209 error (_("Dwarf Error: bad DWP hash table, too few columns"
12210 " in section table [in module %s]"),
12213 if (nr_columns > MAX_NR_V2_DWO_SECTIONS)
12215 error (_("Dwarf Error: bad DWP hash table, too many columns"
12216 " in section table [in module %s]"),
12219 memset (ids, 255, sizeof_ids);
12220 memset (ids_seen, 255, sizeof (ids_seen));
12221 for (i = 0; i < nr_columns; ++i)
12223 int id = read_4_bytes (dbfd, ids_ptr + i * sizeof (uint32_t));
12225 if (id < DW_SECT_MIN || id > DW_SECT_MAX)
12227 error (_("Dwarf Error: bad DWP hash table, bad section id %d"
12228 " in section table [in module %s]"),
12229 id, dwp_file->name);
12231 if (ids_seen[id] != -1)
12233 error (_("Dwarf Error: bad DWP hash table, duplicate section"
12234 " id %d in section table [in module %s]"),
12235 id, dwp_file->name);
12240 /* Must have exactly one info or types section. */
12241 if (((ids_seen[DW_SECT_INFO] != -1)
12242 + (ids_seen[DW_SECT_TYPES] != -1))
12245 error (_("Dwarf Error: bad DWP hash table, missing/duplicate"
12246 " DWO info/types section [in module %s]"),
12249 /* Must have an abbrev section. */
12250 if (ids_seen[DW_SECT_ABBREV] == -1)
12252 error (_("Dwarf Error: bad DWP hash table, missing DWO abbrev"
12253 " section [in module %s]"),
12256 htab->section_pool.v2.offsets = ids_ptr + sizeof (uint32_t) * nr_columns;
12257 htab->section_pool.v2.sizes =
12258 htab->section_pool.v2.offsets + (sizeof (uint32_t)
12259 * nr_units * nr_columns);
12260 if ((htab->section_pool.v2.sizes + (sizeof (uint32_t)
12261 * nr_units * nr_columns))
12264 error (_("Dwarf Error: DWP index section is corrupt (too small)"
12265 " [in module %s]"),
12273 /* Update SECTIONS with the data from SECTP.
12275 This function is like the other "locate" section routines that are
12276 passed to bfd_map_over_sections, but in this context the sections to
12277 read comes from the DWP V1 hash table, not the full ELF section table.
12279 The result is non-zero for success, or zero if an error was found. */
12282 locate_v1_virtual_dwo_sections (asection *sectp,
12283 struct virtual_v1_dwo_sections *sections)
12285 const struct dwop_section_names *names = &dwop_section_names;
12287 if (section_is_p (sectp->name, &names->abbrev_dwo))
12289 /* There can be only one. */
12290 if (sections->abbrev.s.section != NULL)
12292 sections->abbrev.s.section = sectp;
12293 sections->abbrev.size = bfd_get_section_size (sectp);
12295 else if (section_is_p (sectp->name, &names->info_dwo)
12296 || section_is_p (sectp->name, &names->types_dwo))
12298 /* There can be only one. */
12299 if (sections->info_or_types.s.section != NULL)
12301 sections->info_or_types.s.section = sectp;
12302 sections->info_or_types.size = bfd_get_section_size (sectp);
12304 else if (section_is_p (sectp->name, &names->line_dwo))
12306 /* There can be only one. */
12307 if (sections->line.s.section != NULL)
12309 sections->line.s.section = sectp;
12310 sections->line.size = bfd_get_section_size (sectp);
12312 else if (section_is_p (sectp->name, &names->loc_dwo))
12314 /* There can be only one. */
12315 if (sections->loc.s.section != NULL)
12317 sections->loc.s.section = sectp;
12318 sections->loc.size = bfd_get_section_size (sectp);
12320 else if (section_is_p (sectp->name, &names->macinfo_dwo))
12322 /* There can be only one. */
12323 if (sections->macinfo.s.section != NULL)
12325 sections->macinfo.s.section = sectp;
12326 sections->macinfo.size = bfd_get_section_size (sectp);
12328 else if (section_is_p (sectp->name, &names->macro_dwo))
12330 /* There can be only one. */
12331 if (sections->macro.s.section != NULL)
12333 sections->macro.s.section = sectp;
12334 sections->macro.size = bfd_get_section_size (sectp);
12336 else if (section_is_p (sectp->name, &names->str_offsets_dwo))
12338 /* There can be only one. */
12339 if (sections->str_offsets.s.section != NULL)
12341 sections->str_offsets.s.section = sectp;
12342 sections->str_offsets.size = bfd_get_section_size (sectp);
12346 /* No other kind of section is valid. */
12353 /* Create a dwo_unit object for the DWO unit with signature SIGNATURE.
12354 UNIT_INDEX is the index of the DWO unit in the DWP hash table.
12355 COMP_DIR is the DW_AT_comp_dir attribute of the referencing CU.
12356 This is for DWP version 1 files. */
12358 static struct dwo_unit *
12359 create_dwo_unit_in_dwp_v1 (struct dwarf2_per_objfile *dwarf2_per_objfile,
12360 struct dwp_file *dwp_file,
12361 uint32_t unit_index,
12362 const char *comp_dir,
12363 ULONGEST signature, int is_debug_types)
12365 struct objfile *objfile = dwarf2_per_objfile->objfile;
12366 const struct dwp_hash_table *dwp_htab =
12367 is_debug_types ? dwp_file->tus : dwp_file->cus;
12368 bfd *dbfd = dwp_file->dbfd.get ();
12369 const char *kind = is_debug_types ? "TU" : "CU";
12370 struct dwo_file *dwo_file;
12371 struct dwo_unit *dwo_unit;
12372 struct virtual_v1_dwo_sections sections;
12373 void **dwo_file_slot;
12376 gdb_assert (dwp_file->version == 1);
12378 if (dwarf_read_debug)
12380 fprintf_unfiltered (gdb_stdlog, "Reading %s %s/%s in DWP V1 file: %s\n",
12382 pulongest (unit_index), hex_string (signature),
12386 /* Fetch the sections of this DWO unit.
12387 Put a limit on the number of sections we look for so that bad data
12388 doesn't cause us to loop forever. */
12390 #define MAX_NR_V1_DWO_SECTIONS \
12391 (1 /* .debug_info or .debug_types */ \
12392 + 1 /* .debug_abbrev */ \
12393 + 1 /* .debug_line */ \
12394 + 1 /* .debug_loc */ \
12395 + 1 /* .debug_str_offsets */ \
12396 + 1 /* .debug_macro or .debug_macinfo */ \
12397 + 1 /* trailing zero */)
12399 memset (§ions, 0, sizeof (sections));
12401 for (i = 0; i < MAX_NR_V1_DWO_SECTIONS; ++i)
12404 uint32_t section_nr =
12405 read_4_bytes (dbfd,
12406 dwp_htab->section_pool.v1.indices
12407 + (unit_index + i) * sizeof (uint32_t));
12409 if (section_nr == 0)
12411 if (section_nr >= dwp_file->num_sections)
12413 error (_("Dwarf Error: bad DWP hash table, section number too large"
12414 " [in module %s]"),
12418 sectp = dwp_file->elf_sections[section_nr];
12419 if (! locate_v1_virtual_dwo_sections (sectp, §ions))
12421 error (_("Dwarf Error: bad DWP hash table, invalid section found"
12422 " [in module %s]"),
12428 || dwarf2_section_empty_p (§ions.info_or_types)
12429 || dwarf2_section_empty_p (§ions.abbrev))
12431 error (_("Dwarf Error: bad DWP hash table, missing DWO sections"
12432 " [in module %s]"),
12435 if (i == MAX_NR_V1_DWO_SECTIONS)
12437 error (_("Dwarf Error: bad DWP hash table, too many DWO sections"
12438 " [in module %s]"),
12442 /* It's easier for the rest of the code if we fake a struct dwo_file and
12443 have dwo_unit "live" in that. At least for now.
12445 The DWP file can be made up of a random collection of CUs and TUs.
12446 However, for each CU + set of TUs that came from the same original DWO
12447 file, we can combine them back into a virtual DWO file to save space
12448 (fewer struct dwo_file objects to allocate). Remember that for really
12449 large apps there can be on the order of 8K CUs and 200K TUs, or more. */
12451 std::string virtual_dwo_name =
12452 string_printf ("virtual-dwo/%d-%d-%d-%d",
12453 get_section_id (§ions.abbrev),
12454 get_section_id (§ions.line),
12455 get_section_id (§ions.loc),
12456 get_section_id (§ions.str_offsets));
12457 /* Can we use an existing virtual DWO file? */
12458 dwo_file_slot = lookup_dwo_file_slot (dwarf2_per_objfile,
12459 virtual_dwo_name.c_str (),
12461 /* Create one if necessary. */
12462 if (*dwo_file_slot == NULL)
12464 if (dwarf_read_debug)
12466 fprintf_unfiltered (gdb_stdlog, "Creating virtual DWO: %s\n",
12467 virtual_dwo_name.c_str ());
12469 dwo_file = OBSTACK_ZALLOC (&objfile->objfile_obstack, struct dwo_file);
12471 = (const char *) obstack_copy0 (&objfile->objfile_obstack,
12472 virtual_dwo_name.c_str (),
12473 virtual_dwo_name.size ());
12474 dwo_file->comp_dir = comp_dir;
12475 dwo_file->sections.abbrev = sections.abbrev;
12476 dwo_file->sections.line = sections.line;
12477 dwo_file->sections.loc = sections.loc;
12478 dwo_file->sections.macinfo = sections.macinfo;
12479 dwo_file->sections.macro = sections.macro;
12480 dwo_file->sections.str_offsets = sections.str_offsets;
12481 /* The "str" section is global to the entire DWP file. */
12482 dwo_file->sections.str = dwp_file->sections.str;
12483 /* The info or types section is assigned below to dwo_unit,
12484 there's no need to record it in dwo_file.
12485 Also, we can't simply record type sections in dwo_file because
12486 we record a pointer into the vector in dwo_unit. As we collect more
12487 types we'll grow the vector and eventually have to reallocate space
12488 for it, invalidating all copies of pointers into the previous
12490 *dwo_file_slot = dwo_file;
12494 if (dwarf_read_debug)
12496 fprintf_unfiltered (gdb_stdlog, "Using existing virtual DWO: %s\n",
12497 virtual_dwo_name.c_str ());
12499 dwo_file = (struct dwo_file *) *dwo_file_slot;
12502 dwo_unit = OBSTACK_ZALLOC (&objfile->objfile_obstack, struct dwo_unit);
12503 dwo_unit->dwo_file = dwo_file;
12504 dwo_unit->signature = signature;
12505 dwo_unit->section =
12506 XOBNEW (&objfile->objfile_obstack, struct dwarf2_section_info);
12507 *dwo_unit->section = sections.info_or_types;
12508 /* dwo_unit->{offset,length,type_offset_in_tu} are set later. */
12513 /* Subroutine of create_dwo_unit_in_dwp_v2 to simplify it.
12514 Given a pointer to the containing section SECTION, and OFFSET,SIZE of the
12515 piece within that section used by a TU/CU, return a virtual section
12516 of just that piece. */
12518 static struct dwarf2_section_info
12519 create_dwp_v2_section (struct dwarf2_per_objfile *dwarf2_per_objfile,
12520 struct dwarf2_section_info *section,
12521 bfd_size_type offset, bfd_size_type size)
12523 struct dwarf2_section_info result;
12526 gdb_assert (section != NULL);
12527 gdb_assert (!section->is_virtual);
12529 memset (&result, 0, sizeof (result));
12530 result.s.containing_section = section;
12531 result.is_virtual = 1;
12536 sectp = get_section_bfd_section (section);
12538 /* Flag an error if the piece denoted by OFFSET,SIZE is outside the
12539 bounds of the real section. This is a pretty-rare event, so just
12540 flag an error (easier) instead of a warning and trying to cope. */
12542 || offset + size > bfd_get_section_size (sectp))
12544 error (_("Dwarf Error: Bad DWP V2 section info, doesn't fit"
12545 " in section %s [in module %s]"),
12546 sectp ? bfd_section_name (abfd, sectp) : "<unknown>",
12547 objfile_name (dwarf2_per_objfile->objfile));
12550 result.virtual_offset = offset;
12551 result.size = size;
12555 /* Create a dwo_unit object for the DWO unit with signature SIGNATURE.
12556 UNIT_INDEX is the index of the DWO unit in the DWP hash table.
12557 COMP_DIR is the DW_AT_comp_dir attribute of the referencing CU.
12558 This is for DWP version 2 files. */
12560 static struct dwo_unit *
12561 create_dwo_unit_in_dwp_v2 (struct dwarf2_per_objfile *dwarf2_per_objfile,
12562 struct dwp_file *dwp_file,
12563 uint32_t unit_index,
12564 const char *comp_dir,
12565 ULONGEST signature, int is_debug_types)
12567 struct objfile *objfile = dwarf2_per_objfile->objfile;
12568 const struct dwp_hash_table *dwp_htab =
12569 is_debug_types ? dwp_file->tus : dwp_file->cus;
12570 bfd *dbfd = dwp_file->dbfd.get ();
12571 const char *kind = is_debug_types ? "TU" : "CU";
12572 struct dwo_file *dwo_file;
12573 struct dwo_unit *dwo_unit;
12574 struct virtual_v2_dwo_sections sections;
12575 void **dwo_file_slot;
12578 gdb_assert (dwp_file->version == 2);
12580 if (dwarf_read_debug)
12582 fprintf_unfiltered (gdb_stdlog, "Reading %s %s/%s in DWP V2 file: %s\n",
12584 pulongest (unit_index), hex_string (signature),
12588 /* Fetch the section offsets of this DWO unit. */
12590 memset (§ions, 0, sizeof (sections));
12592 for (i = 0; i < dwp_htab->nr_columns; ++i)
12594 uint32_t offset = read_4_bytes (dbfd,
12595 dwp_htab->section_pool.v2.offsets
12596 + (((unit_index - 1) * dwp_htab->nr_columns
12598 * sizeof (uint32_t)));
12599 uint32_t size = read_4_bytes (dbfd,
12600 dwp_htab->section_pool.v2.sizes
12601 + (((unit_index - 1) * dwp_htab->nr_columns
12603 * sizeof (uint32_t)));
12605 switch (dwp_htab->section_pool.v2.section_ids[i])
12608 case DW_SECT_TYPES:
12609 sections.info_or_types_offset = offset;
12610 sections.info_or_types_size = size;
12612 case DW_SECT_ABBREV:
12613 sections.abbrev_offset = offset;
12614 sections.abbrev_size = size;
12617 sections.line_offset = offset;
12618 sections.line_size = size;
12621 sections.loc_offset = offset;
12622 sections.loc_size = size;
12624 case DW_SECT_STR_OFFSETS:
12625 sections.str_offsets_offset = offset;
12626 sections.str_offsets_size = size;
12628 case DW_SECT_MACINFO:
12629 sections.macinfo_offset = offset;
12630 sections.macinfo_size = size;
12632 case DW_SECT_MACRO:
12633 sections.macro_offset = offset;
12634 sections.macro_size = size;
12639 /* It's easier for the rest of the code if we fake a struct dwo_file and
12640 have dwo_unit "live" in that. At least for now.
12642 The DWP file can be made up of a random collection of CUs and TUs.
12643 However, for each CU + set of TUs that came from the same original DWO
12644 file, we can combine them back into a virtual DWO file to save space
12645 (fewer struct dwo_file objects to allocate). Remember that for really
12646 large apps there can be on the order of 8K CUs and 200K TUs, or more. */
12648 std::string virtual_dwo_name =
12649 string_printf ("virtual-dwo/%ld-%ld-%ld-%ld",
12650 (long) (sections.abbrev_size ? sections.abbrev_offset : 0),
12651 (long) (sections.line_size ? sections.line_offset : 0),
12652 (long) (sections.loc_size ? sections.loc_offset : 0),
12653 (long) (sections.str_offsets_size
12654 ? sections.str_offsets_offset : 0));
12655 /* Can we use an existing virtual DWO file? */
12656 dwo_file_slot = lookup_dwo_file_slot (dwarf2_per_objfile,
12657 virtual_dwo_name.c_str (),
12659 /* Create one if necessary. */
12660 if (*dwo_file_slot == NULL)
12662 if (dwarf_read_debug)
12664 fprintf_unfiltered (gdb_stdlog, "Creating virtual DWO: %s\n",
12665 virtual_dwo_name.c_str ());
12667 dwo_file = OBSTACK_ZALLOC (&objfile->objfile_obstack, struct dwo_file);
12669 = (const char *) obstack_copy0 (&objfile->objfile_obstack,
12670 virtual_dwo_name.c_str (),
12671 virtual_dwo_name.size ());
12672 dwo_file->comp_dir = comp_dir;
12673 dwo_file->sections.abbrev =
12674 create_dwp_v2_section (dwarf2_per_objfile, &dwp_file->sections.abbrev,
12675 sections.abbrev_offset, sections.abbrev_size);
12676 dwo_file->sections.line =
12677 create_dwp_v2_section (dwarf2_per_objfile, &dwp_file->sections.line,
12678 sections.line_offset, sections.line_size);
12679 dwo_file->sections.loc =
12680 create_dwp_v2_section (dwarf2_per_objfile, &dwp_file->sections.loc,
12681 sections.loc_offset, sections.loc_size);
12682 dwo_file->sections.macinfo =
12683 create_dwp_v2_section (dwarf2_per_objfile, &dwp_file->sections.macinfo,
12684 sections.macinfo_offset, sections.macinfo_size);
12685 dwo_file->sections.macro =
12686 create_dwp_v2_section (dwarf2_per_objfile, &dwp_file->sections.macro,
12687 sections.macro_offset, sections.macro_size);
12688 dwo_file->sections.str_offsets =
12689 create_dwp_v2_section (dwarf2_per_objfile,
12690 &dwp_file->sections.str_offsets,
12691 sections.str_offsets_offset,
12692 sections.str_offsets_size);
12693 /* The "str" section is global to the entire DWP file. */
12694 dwo_file->sections.str = dwp_file->sections.str;
12695 /* The info or types section is assigned below to dwo_unit,
12696 there's no need to record it in dwo_file.
12697 Also, we can't simply record type sections in dwo_file because
12698 we record a pointer into the vector in dwo_unit. As we collect more
12699 types we'll grow the vector and eventually have to reallocate space
12700 for it, invalidating all copies of pointers into the previous
12702 *dwo_file_slot = dwo_file;
12706 if (dwarf_read_debug)
12708 fprintf_unfiltered (gdb_stdlog, "Using existing virtual DWO: %s\n",
12709 virtual_dwo_name.c_str ());
12711 dwo_file = (struct dwo_file *) *dwo_file_slot;
12714 dwo_unit = OBSTACK_ZALLOC (&objfile->objfile_obstack, struct dwo_unit);
12715 dwo_unit->dwo_file = dwo_file;
12716 dwo_unit->signature = signature;
12717 dwo_unit->section =
12718 XOBNEW (&objfile->objfile_obstack, struct dwarf2_section_info);
12719 *dwo_unit->section = create_dwp_v2_section (dwarf2_per_objfile,
12721 ? &dwp_file->sections.types
12722 : &dwp_file->sections.info,
12723 sections.info_or_types_offset,
12724 sections.info_or_types_size);
12725 /* dwo_unit->{offset,length,type_offset_in_tu} are set later. */
12730 /* Lookup the DWO unit with SIGNATURE in DWP_FILE.
12731 Returns NULL if the signature isn't found. */
12733 static struct dwo_unit *
12734 lookup_dwo_unit_in_dwp (struct dwarf2_per_objfile *dwarf2_per_objfile,
12735 struct dwp_file *dwp_file, const char *comp_dir,
12736 ULONGEST signature, int is_debug_types)
12738 const struct dwp_hash_table *dwp_htab =
12739 is_debug_types ? dwp_file->tus : dwp_file->cus;
12740 bfd *dbfd = dwp_file->dbfd.get ();
12741 uint32_t mask = dwp_htab->nr_slots - 1;
12742 uint32_t hash = signature & mask;
12743 uint32_t hash2 = ((signature >> 32) & mask) | 1;
12746 struct dwo_unit find_dwo_cu;
12748 memset (&find_dwo_cu, 0, sizeof (find_dwo_cu));
12749 find_dwo_cu.signature = signature;
12750 slot = htab_find_slot (is_debug_types
12751 ? dwp_file->loaded_tus
12752 : dwp_file->loaded_cus,
12753 &find_dwo_cu, INSERT);
12756 return (struct dwo_unit *) *slot;
12758 /* Use a for loop so that we don't loop forever on bad debug info. */
12759 for (i = 0; i < dwp_htab->nr_slots; ++i)
12761 ULONGEST signature_in_table;
12763 signature_in_table =
12764 read_8_bytes (dbfd, dwp_htab->hash_table + hash * sizeof (uint64_t));
12765 if (signature_in_table == signature)
12767 uint32_t unit_index =
12768 read_4_bytes (dbfd,
12769 dwp_htab->unit_table + hash * sizeof (uint32_t));
12771 if (dwp_file->version == 1)
12773 *slot = create_dwo_unit_in_dwp_v1 (dwarf2_per_objfile,
12774 dwp_file, unit_index,
12775 comp_dir, signature,
12780 *slot = create_dwo_unit_in_dwp_v2 (dwarf2_per_objfile,
12781 dwp_file, unit_index,
12782 comp_dir, signature,
12785 return (struct dwo_unit *) *slot;
12787 if (signature_in_table == 0)
12789 hash = (hash + hash2) & mask;
12792 error (_("Dwarf Error: bad DWP hash table, lookup didn't terminate"
12793 " [in module %s]"),
12797 /* Subroutine of open_dwo_file,open_dwp_file to simplify them.
12798 Open the file specified by FILE_NAME and hand it off to BFD for
12799 preliminary analysis. Return a newly initialized bfd *, which
12800 includes a canonicalized copy of FILE_NAME.
12801 If IS_DWP is TRUE, we're opening a DWP file, otherwise a DWO file.
12802 SEARCH_CWD is true if the current directory is to be searched.
12803 It will be searched before debug-file-directory.
12804 If successful, the file is added to the bfd include table of the
12805 objfile's bfd (see gdb_bfd_record_inclusion).
12806 If unable to find/open the file, return NULL.
12807 NOTE: This function is derived from symfile_bfd_open. */
12809 static gdb_bfd_ref_ptr
12810 try_open_dwop_file (struct dwarf2_per_objfile *dwarf2_per_objfile,
12811 const char *file_name, int is_dwp, int search_cwd)
12814 /* Blech. OPF_TRY_CWD_FIRST also disables searching the path list if
12815 FILE_NAME contains a '/'. So we can't use it. Instead prepend "."
12816 to debug_file_directory. */
12817 const char *search_path;
12818 static const char dirname_separator_string[] = { DIRNAME_SEPARATOR, '\0' };
12820 gdb::unique_xmalloc_ptr<char> search_path_holder;
12823 if (*debug_file_directory != '\0')
12825 search_path_holder.reset (concat (".", dirname_separator_string,
12826 debug_file_directory,
12828 search_path = search_path_holder.get ();
12834 search_path = debug_file_directory;
12836 openp_flags flags = OPF_RETURN_REALPATH;
12838 flags |= OPF_SEARCH_IN_PATH;
12840 gdb::unique_xmalloc_ptr<char> absolute_name;
12841 desc = openp (search_path, flags, file_name,
12842 O_RDONLY | O_BINARY, &absolute_name);
12846 gdb_bfd_ref_ptr sym_bfd (gdb_bfd_open (absolute_name.get (),
12848 if (sym_bfd == NULL)
12850 bfd_set_cacheable (sym_bfd.get (), 1);
12852 if (!bfd_check_format (sym_bfd.get (), bfd_object))
12855 /* Success. Record the bfd as having been included by the objfile's bfd.
12856 This is important because things like demangled_names_hash lives in the
12857 objfile's per_bfd space and may have references to things like symbol
12858 names that live in the DWO/DWP file's per_bfd space. PR 16426. */
12859 gdb_bfd_record_inclusion (dwarf2_per_objfile->objfile->obfd, sym_bfd.get ());
12864 /* Try to open DWO file FILE_NAME.
12865 COMP_DIR is the DW_AT_comp_dir attribute.
12866 The result is the bfd handle of the file.
12867 If there is a problem finding or opening the file, return NULL.
12868 Upon success, the canonicalized path of the file is stored in the bfd,
12869 same as symfile_bfd_open. */
12871 static gdb_bfd_ref_ptr
12872 open_dwo_file (struct dwarf2_per_objfile *dwarf2_per_objfile,
12873 const char *file_name, const char *comp_dir)
12875 if (IS_ABSOLUTE_PATH (file_name))
12876 return try_open_dwop_file (dwarf2_per_objfile, file_name,
12877 0 /*is_dwp*/, 0 /*search_cwd*/);
12879 /* Before trying the search path, try DWO_NAME in COMP_DIR. */
12881 if (comp_dir != NULL)
12883 char *path_to_try = concat (comp_dir, SLASH_STRING,
12884 file_name, (char *) NULL);
12886 /* NOTE: If comp_dir is a relative path, this will also try the
12887 search path, which seems useful. */
12888 gdb_bfd_ref_ptr abfd (try_open_dwop_file (dwarf2_per_objfile,
12891 1 /*search_cwd*/));
12892 xfree (path_to_try);
12897 /* That didn't work, try debug-file-directory, which, despite its name,
12898 is a list of paths. */
12900 if (*debug_file_directory == '\0')
12903 return try_open_dwop_file (dwarf2_per_objfile, file_name,
12904 0 /*is_dwp*/, 1 /*search_cwd*/);
12907 /* This function is mapped across the sections and remembers the offset and
12908 size of each of the DWO debugging sections we are interested in. */
12911 dwarf2_locate_dwo_sections (bfd *abfd, asection *sectp, void *dwo_sections_ptr)
12913 struct dwo_sections *dwo_sections = (struct dwo_sections *) dwo_sections_ptr;
12914 const struct dwop_section_names *names = &dwop_section_names;
12916 if (section_is_p (sectp->name, &names->abbrev_dwo))
12918 dwo_sections->abbrev.s.section = sectp;
12919 dwo_sections->abbrev.size = bfd_get_section_size (sectp);
12921 else if (section_is_p (sectp->name, &names->info_dwo))
12923 dwo_sections->info.s.section = sectp;
12924 dwo_sections->info.size = bfd_get_section_size (sectp);
12926 else if (section_is_p (sectp->name, &names->line_dwo))
12928 dwo_sections->line.s.section = sectp;
12929 dwo_sections->line.size = bfd_get_section_size (sectp);
12931 else if (section_is_p (sectp->name, &names->loc_dwo))
12933 dwo_sections->loc.s.section = sectp;
12934 dwo_sections->loc.size = bfd_get_section_size (sectp);
12936 else if (section_is_p (sectp->name, &names->macinfo_dwo))
12938 dwo_sections->macinfo.s.section = sectp;
12939 dwo_sections->macinfo.size = bfd_get_section_size (sectp);
12941 else if (section_is_p (sectp->name, &names->macro_dwo))
12943 dwo_sections->macro.s.section = sectp;
12944 dwo_sections->macro.size = bfd_get_section_size (sectp);
12946 else if (section_is_p (sectp->name, &names->str_dwo))
12948 dwo_sections->str.s.section = sectp;
12949 dwo_sections->str.size = bfd_get_section_size (sectp);
12951 else if (section_is_p (sectp->name, &names->str_offsets_dwo))
12953 dwo_sections->str_offsets.s.section = sectp;
12954 dwo_sections->str_offsets.size = bfd_get_section_size (sectp);
12956 else if (section_is_p (sectp->name, &names->types_dwo))
12958 struct dwarf2_section_info type_section;
12960 memset (&type_section, 0, sizeof (type_section));
12961 type_section.s.section = sectp;
12962 type_section.size = bfd_get_section_size (sectp);
12963 VEC_safe_push (dwarf2_section_info_def, dwo_sections->types,
12968 /* Initialize the use of the DWO file specified by DWO_NAME and referenced
12969 by PER_CU. This is for the non-DWP case.
12970 The result is NULL if DWO_NAME can't be found. */
12972 static struct dwo_file *
12973 open_and_init_dwo_file (struct dwarf2_per_cu_data *per_cu,
12974 const char *dwo_name, const char *comp_dir)
12976 struct dwarf2_per_objfile *dwarf2_per_objfile = per_cu->dwarf2_per_objfile;
12977 struct objfile *objfile = dwarf2_per_objfile->objfile;
12979 gdb_bfd_ref_ptr dbfd (open_dwo_file (dwarf2_per_objfile, dwo_name, comp_dir));
12982 if (dwarf_read_debug)
12983 fprintf_unfiltered (gdb_stdlog, "DWO file not found: %s\n", dwo_name);
12987 /* We use a unique pointer here, despite the obstack allocation,
12988 because a dwo_file needs some cleanup if it is abandoned. */
12989 dwo_file_up dwo_file (OBSTACK_ZALLOC (&objfile->objfile_obstack,
12991 dwo_file->dwo_name = dwo_name;
12992 dwo_file->comp_dir = comp_dir;
12993 dwo_file->dbfd = dbfd.release ();
12995 bfd_map_over_sections (dwo_file->dbfd, dwarf2_locate_dwo_sections,
12996 &dwo_file->sections);
12998 create_cus_hash_table (dwarf2_per_objfile, *dwo_file, dwo_file->sections.info,
13001 create_debug_types_hash_table (dwarf2_per_objfile, dwo_file.get (),
13002 dwo_file->sections.types, dwo_file->tus);
13004 if (dwarf_read_debug)
13005 fprintf_unfiltered (gdb_stdlog, "DWO file found: %s\n", dwo_name);
13007 return dwo_file.release ();
13010 /* This function is mapped across the sections and remembers the offset and
13011 size of each of the DWP debugging sections common to version 1 and 2 that
13012 we are interested in. */
13015 dwarf2_locate_common_dwp_sections (bfd *abfd, asection *sectp,
13016 void *dwp_file_ptr)
13018 struct dwp_file *dwp_file = (struct dwp_file *) dwp_file_ptr;
13019 const struct dwop_section_names *names = &dwop_section_names;
13020 unsigned int elf_section_nr = elf_section_data (sectp)->this_idx;
13022 /* Record the ELF section number for later lookup: this is what the
13023 .debug_cu_index,.debug_tu_index tables use in DWP V1. */
13024 gdb_assert (elf_section_nr < dwp_file->num_sections);
13025 dwp_file->elf_sections[elf_section_nr] = sectp;
13027 /* Look for specific sections that we need. */
13028 if (section_is_p (sectp->name, &names->str_dwo))
13030 dwp_file->sections.str.s.section = sectp;
13031 dwp_file->sections.str.size = bfd_get_section_size (sectp);
13033 else if (section_is_p (sectp->name, &names->cu_index))
13035 dwp_file->sections.cu_index.s.section = sectp;
13036 dwp_file->sections.cu_index.size = bfd_get_section_size (sectp);
13038 else if (section_is_p (sectp->name, &names->tu_index))
13040 dwp_file->sections.tu_index.s.section = sectp;
13041 dwp_file->sections.tu_index.size = bfd_get_section_size (sectp);
13045 /* This function is mapped across the sections and remembers the offset and
13046 size of each of the DWP version 2 debugging sections that we are interested
13047 in. This is split into a separate function because we don't know if we
13048 have version 1 or 2 until we parse the cu_index/tu_index sections. */
13051 dwarf2_locate_v2_dwp_sections (bfd *abfd, asection *sectp, void *dwp_file_ptr)
13053 struct dwp_file *dwp_file = (struct dwp_file *) dwp_file_ptr;
13054 const struct dwop_section_names *names = &dwop_section_names;
13055 unsigned int elf_section_nr = elf_section_data (sectp)->this_idx;
13057 /* Record the ELF section number for later lookup: this is what the
13058 .debug_cu_index,.debug_tu_index tables use in DWP V1. */
13059 gdb_assert (elf_section_nr < dwp_file->num_sections);
13060 dwp_file->elf_sections[elf_section_nr] = sectp;
13062 /* Look for specific sections that we need. */
13063 if (section_is_p (sectp->name, &names->abbrev_dwo))
13065 dwp_file->sections.abbrev.s.section = sectp;
13066 dwp_file->sections.abbrev.size = bfd_get_section_size (sectp);
13068 else if (section_is_p (sectp->name, &names->info_dwo))
13070 dwp_file->sections.info.s.section = sectp;
13071 dwp_file->sections.info.size = bfd_get_section_size (sectp);
13073 else if (section_is_p (sectp->name, &names->line_dwo))
13075 dwp_file->sections.line.s.section = sectp;
13076 dwp_file->sections.line.size = bfd_get_section_size (sectp);
13078 else if (section_is_p (sectp->name, &names->loc_dwo))
13080 dwp_file->sections.loc.s.section = sectp;
13081 dwp_file->sections.loc.size = bfd_get_section_size (sectp);
13083 else if (section_is_p (sectp->name, &names->macinfo_dwo))
13085 dwp_file->sections.macinfo.s.section = sectp;
13086 dwp_file->sections.macinfo.size = bfd_get_section_size (sectp);
13088 else if (section_is_p (sectp->name, &names->macro_dwo))
13090 dwp_file->sections.macro.s.section = sectp;
13091 dwp_file->sections.macro.size = bfd_get_section_size (sectp);
13093 else if (section_is_p (sectp->name, &names->str_offsets_dwo))
13095 dwp_file->sections.str_offsets.s.section = sectp;
13096 dwp_file->sections.str_offsets.size = bfd_get_section_size (sectp);
13098 else if (section_is_p (sectp->name, &names->types_dwo))
13100 dwp_file->sections.types.s.section = sectp;
13101 dwp_file->sections.types.size = bfd_get_section_size (sectp);
13105 /* Hash function for dwp_file loaded CUs/TUs. */
13108 hash_dwp_loaded_cutus (const void *item)
13110 const struct dwo_unit *dwo_unit = (const struct dwo_unit *) item;
13112 /* This drops the top 32 bits of the signature, but is ok for a hash. */
13113 return dwo_unit->signature;
13116 /* Equality function for dwp_file loaded CUs/TUs. */
13119 eq_dwp_loaded_cutus (const void *a, const void *b)
13121 const struct dwo_unit *dua = (const struct dwo_unit *) a;
13122 const struct dwo_unit *dub = (const struct dwo_unit *) b;
13124 return dua->signature == dub->signature;
13127 /* Allocate a hash table for dwp_file loaded CUs/TUs. */
13130 allocate_dwp_loaded_cutus_table (struct objfile *objfile)
13132 return htab_create_alloc_ex (3,
13133 hash_dwp_loaded_cutus,
13134 eq_dwp_loaded_cutus,
13136 &objfile->objfile_obstack,
13137 hashtab_obstack_allocate,
13138 dummy_obstack_deallocate);
13141 /* Try to open DWP file FILE_NAME.
13142 The result is the bfd handle of the file.
13143 If there is a problem finding or opening the file, return NULL.
13144 Upon success, the canonicalized path of the file is stored in the bfd,
13145 same as symfile_bfd_open. */
13147 static gdb_bfd_ref_ptr
13148 open_dwp_file (struct dwarf2_per_objfile *dwarf2_per_objfile,
13149 const char *file_name)
13151 gdb_bfd_ref_ptr abfd (try_open_dwop_file (dwarf2_per_objfile, file_name,
13153 1 /*search_cwd*/));
13157 /* Work around upstream bug 15652.
13158 http://sourceware.org/bugzilla/show_bug.cgi?id=15652
13159 [Whether that's a "bug" is debatable, but it is getting in our way.]
13160 We have no real idea where the dwp file is, because gdb's realpath-ing
13161 of the executable's path may have discarded the needed info.
13162 [IWBN if the dwp file name was recorded in the executable, akin to
13163 .gnu_debuglink, but that doesn't exist yet.]
13164 Strip the directory from FILE_NAME and search again. */
13165 if (*debug_file_directory != '\0')
13167 /* Don't implicitly search the current directory here.
13168 If the user wants to search "." to handle this case,
13169 it must be added to debug-file-directory. */
13170 return try_open_dwop_file (dwarf2_per_objfile,
13171 lbasename (file_name), 1 /*is_dwp*/,
13178 /* Initialize the use of the DWP file for the current objfile.
13179 By convention the name of the DWP file is ${objfile}.dwp.
13180 The result is NULL if it can't be found. */
13182 static std::unique_ptr<struct dwp_file>
13183 open_and_init_dwp_file (struct dwarf2_per_objfile *dwarf2_per_objfile)
13185 struct objfile *objfile = dwarf2_per_objfile->objfile;
13187 /* Try to find first .dwp for the binary file before any symbolic links
13190 /* If the objfile is a debug file, find the name of the real binary
13191 file and get the name of dwp file from there. */
13192 std::string dwp_name;
13193 if (objfile->separate_debug_objfile_backlink != NULL)
13195 struct objfile *backlink = objfile->separate_debug_objfile_backlink;
13196 const char *backlink_basename = lbasename (backlink->original_name);
13198 dwp_name = ldirname (objfile->original_name) + SLASH_STRING + backlink_basename;
13201 dwp_name = objfile->original_name;
13203 dwp_name += ".dwp";
13205 gdb_bfd_ref_ptr dbfd (open_dwp_file (dwarf2_per_objfile, dwp_name.c_str ()));
13207 && strcmp (objfile->original_name, objfile_name (objfile)) != 0)
13209 /* Try to find .dwp for the binary file after gdb_realpath resolving. */
13210 dwp_name = objfile_name (objfile);
13211 dwp_name += ".dwp";
13212 dbfd = open_dwp_file (dwarf2_per_objfile, dwp_name.c_str ());
13217 if (dwarf_read_debug)
13218 fprintf_unfiltered (gdb_stdlog, "DWP file not found: %s\n", dwp_name.c_str ());
13219 return std::unique_ptr<dwp_file> ();
13222 const char *name = bfd_get_filename (dbfd.get ());
13223 std::unique_ptr<struct dwp_file> dwp_file
13224 (new struct dwp_file (name, std::move (dbfd)));
13226 dwp_file->num_sections = elf_numsections (dwp_file->dbfd);
13227 dwp_file->elf_sections =
13228 OBSTACK_CALLOC (&objfile->objfile_obstack,
13229 dwp_file->num_sections, asection *);
13231 bfd_map_over_sections (dwp_file->dbfd.get (),
13232 dwarf2_locate_common_dwp_sections,
13235 dwp_file->cus = create_dwp_hash_table (dwarf2_per_objfile, dwp_file.get (),
13238 dwp_file->tus = create_dwp_hash_table (dwarf2_per_objfile, dwp_file.get (),
13241 /* The DWP file version is stored in the hash table. Oh well. */
13242 if (dwp_file->cus && dwp_file->tus
13243 && dwp_file->cus->version != dwp_file->tus->version)
13245 /* Technically speaking, we should try to limp along, but this is
13246 pretty bizarre. We use pulongest here because that's the established
13247 portability solution (e.g, we cannot use %u for uint32_t). */
13248 error (_("Dwarf Error: DWP file CU version %s doesn't match"
13249 " TU version %s [in DWP file %s]"),
13250 pulongest (dwp_file->cus->version),
13251 pulongest (dwp_file->tus->version), dwp_name.c_str ());
13255 dwp_file->version = dwp_file->cus->version;
13256 else if (dwp_file->tus)
13257 dwp_file->version = dwp_file->tus->version;
13259 dwp_file->version = 2;
13261 if (dwp_file->version == 2)
13262 bfd_map_over_sections (dwp_file->dbfd.get (),
13263 dwarf2_locate_v2_dwp_sections,
13266 dwp_file->loaded_cus = allocate_dwp_loaded_cutus_table (objfile);
13267 dwp_file->loaded_tus = allocate_dwp_loaded_cutus_table (objfile);
13269 if (dwarf_read_debug)
13271 fprintf_unfiltered (gdb_stdlog, "DWP file found: %s\n", dwp_file->name);
13272 fprintf_unfiltered (gdb_stdlog,
13273 " %s CUs, %s TUs\n",
13274 pulongest (dwp_file->cus ? dwp_file->cus->nr_units : 0),
13275 pulongest (dwp_file->tus ? dwp_file->tus->nr_units : 0));
13281 /* Wrapper around open_and_init_dwp_file, only open it once. */
13283 static struct dwp_file *
13284 get_dwp_file (struct dwarf2_per_objfile *dwarf2_per_objfile)
13286 if (! dwarf2_per_objfile->dwp_checked)
13288 dwarf2_per_objfile->dwp_file
13289 = open_and_init_dwp_file (dwarf2_per_objfile);
13290 dwarf2_per_objfile->dwp_checked = 1;
13292 return dwarf2_per_objfile->dwp_file.get ();
13295 /* Subroutine of lookup_dwo_comp_unit, lookup_dwo_type_unit.
13296 Look up the CU/TU with signature SIGNATURE, either in DWO file DWO_NAME
13297 or in the DWP file for the objfile, referenced by THIS_UNIT.
13298 If non-NULL, comp_dir is the DW_AT_comp_dir attribute.
13299 IS_DEBUG_TYPES is non-zero if reading a TU, otherwise read a CU.
13301 This is called, for example, when wanting to read a variable with a
13302 complex location. Therefore we don't want to do file i/o for every call.
13303 Therefore we don't want to look for a DWO file on every call.
13304 Therefore we first see if we've already seen SIGNATURE in a DWP file,
13305 then we check if we've already seen DWO_NAME, and only THEN do we check
13308 The result is a pointer to the dwo_unit object or NULL if we didn't find it
13309 (dwo_id mismatch or couldn't find the DWO/DWP file). */
13311 static struct dwo_unit *
13312 lookup_dwo_cutu (struct dwarf2_per_cu_data *this_unit,
13313 const char *dwo_name, const char *comp_dir,
13314 ULONGEST signature, int is_debug_types)
13316 struct dwarf2_per_objfile *dwarf2_per_objfile = this_unit->dwarf2_per_objfile;
13317 struct objfile *objfile = dwarf2_per_objfile->objfile;
13318 const char *kind = is_debug_types ? "TU" : "CU";
13319 void **dwo_file_slot;
13320 struct dwo_file *dwo_file;
13321 struct dwp_file *dwp_file;
13323 /* First see if there's a DWP file.
13324 If we have a DWP file but didn't find the DWO inside it, don't
13325 look for the original DWO file. It makes gdb behave differently
13326 depending on whether one is debugging in the build tree. */
13328 dwp_file = get_dwp_file (dwarf2_per_objfile);
13329 if (dwp_file != NULL)
13331 const struct dwp_hash_table *dwp_htab =
13332 is_debug_types ? dwp_file->tus : dwp_file->cus;
13334 if (dwp_htab != NULL)
13336 struct dwo_unit *dwo_cutu =
13337 lookup_dwo_unit_in_dwp (dwarf2_per_objfile, dwp_file, comp_dir,
13338 signature, is_debug_types);
13340 if (dwo_cutu != NULL)
13342 if (dwarf_read_debug)
13344 fprintf_unfiltered (gdb_stdlog,
13345 "Virtual DWO %s %s found: @%s\n",
13346 kind, hex_string (signature),
13347 host_address_to_string (dwo_cutu));
13355 /* No DWP file, look for the DWO file. */
13357 dwo_file_slot = lookup_dwo_file_slot (dwarf2_per_objfile,
13358 dwo_name, comp_dir);
13359 if (*dwo_file_slot == NULL)
13361 /* Read in the file and build a table of the CUs/TUs it contains. */
13362 *dwo_file_slot = open_and_init_dwo_file (this_unit, dwo_name, comp_dir);
13364 /* NOTE: This will be NULL if unable to open the file. */
13365 dwo_file = (struct dwo_file *) *dwo_file_slot;
13367 if (dwo_file != NULL)
13369 struct dwo_unit *dwo_cutu = NULL;
13371 if (is_debug_types && dwo_file->tus)
13373 struct dwo_unit find_dwo_cutu;
13375 memset (&find_dwo_cutu, 0, sizeof (find_dwo_cutu));
13376 find_dwo_cutu.signature = signature;
13378 = (struct dwo_unit *) htab_find (dwo_file->tus, &find_dwo_cutu);
13380 else if (!is_debug_types && dwo_file->cus)
13382 struct dwo_unit find_dwo_cutu;
13384 memset (&find_dwo_cutu, 0, sizeof (find_dwo_cutu));
13385 find_dwo_cutu.signature = signature;
13386 dwo_cutu = (struct dwo_unit *)htab_find (dwo_file->cus,
13390 if (dwo_cutu != NULL)
13392 if (dwarf_read_debug)
13394 fprintf_unfiltered (gdb_stdlog, "DWO %s %s(%s) found: @%s\n",
13395 kind, dwo_name, hex_string (signature),
13396 host_address_to_string (dwo_cutu));
13403 /* We didn't find it. This could mean a dwo_id mismatch, or
13404 someone deleted the DWO/DWP file, or the search path isn't set up
13405 correctly to find the file. */
13407 if (dwarf_read_debug)
13409 fprintf_unfiltered (gdb_stdlog, "DWO %s %s(%s) not found\n",
13410 kind, dwo_name, hex_string (signature));
13413 /* This is a warning and not a complaint because it can be caused by
13414 pilot error (e.g., user accidentally deleting the DWO). */
13416 /* Print the name of the DWP file if we looked there, helps the user
13417 better diagnose the problem. */
13418 std::string dwp_text;
13420 if (dwp_file != NULL)
13421 dwp_text = string_printf (" [in DWP file %s]",
13422 lbasename (dwp_file->name));
13424 warning (_("Could not find DWO %s %s(%s)%s referenced by %s at offset %s"
13425 " [in module %s]"),
13426 kind, dwo_name, hex_string (signature),
13428 this_unit->is_debug_types ? "TU" : "CU",
13429 sect_offset_str (this_unit->sect_off), objfile_name (objfile));
13434 /* Lookup the DWO CU DWO_NAME/SIGNATURE referenced from THIS_CU.
13435 See lookup_dwo_cutu_unit for details. */
13437 static struct dwo_unit *
13438 lookup_dwo_comp_unit (struct dwarf2_per_cu_data *this_cu,
13439 const char *dwo_name, const char *comp_dir,
13440 ULONGEST signature)
13442 return lookup_dwo_cutu (this_cu, dwo_name, comp_dir, signature, 0);
13445 /* Lookup the DWO TU DWO_NAME/SIGNATURE referenced from THIS_TU.
13446 See lookup_dwo_cutu_unit for details. */
13448 static struct dwo_unit *
13449 lookup_dwo_type_unit (struct signatured_type *this_tu,
13450 const char *dwo_name, const char *comp_dir)
13452 return lookup_dwo_cutu (&this_tu->per_cu, dwo_name, comp_dir, this_tu->signature, 1);
13455 /* Traversal function for queue_and_load_all_dwo_tus. */
13458 queue_and_load_dwo_tu (void **slot, void *info)
13460 struct dwo_unit *dwo_unit = (struct dwo_unit *) *slot;
13461 struct dwarf2_per_cu_data *per_cu = (struct dwarf2_per_cu_data *) info;
13462 ULONGEST signature = dwo_unit->signature;
13463 struct signatured_type *sig_type =
13464 lookup_dwo_signatured_type (per_cu->cu, signature);
13466 if (sig_type != NULL)
13468 struct dwarf2_per_cu_data *sig_cu = &sig_type->per_cu;
13470 /* We pass NULL for DEPENDENT_CU because we don't yet know if there's
13471 a real dependency of PER_CU on SIG_TYPE. That is detected later
13472 while processing PER_CU. */
13473 if (maybe_queue_comp_unit (NULL, sig_cu, per_cu->cu->language))
13474 load_full_type_unit (sig_cu);
13475 VEC_safe_push (dwarf2_per_cu_ptr, per_cu->imported_symtabs, sig_cu);
13481 /* Queue all TUs contained in the DWO of PER_CU to be read in.
13482 The DWO may have the only definition of the type, though it may not be
13483 referenced anywhere in PER_CU. Thus we have to load *all* its TUs.
13484 http://sourceware.org/bugzilla/show_bug.cgi?id=15021 */
13487 queue_and_load_all_dwo_tus (struct dwarf2_per_cu_data *per_cu)
13489 struct dwo_unit *dwo_unit;
13490 struct dwo_file *dwo_file;
13492 gdb_assert (!per_cu->is_debug_types);
13493 gdb_assert (get_dwp_file (per_cu->dwarf2_per_objfile) == NULL);
13494 gdb_assert (per_cu->cu != NULL);
13496 dwo_unit = per_cu->cu->dwo_unit;
13497 gdb_assert (dwo_unit != NULL);
13499 dwo_file = dwo_unit->dwo_file;
13500 if (dwo_file->tus != NULL)
13501 htab_traverse_noresize (dwo_file->tus, queue_and_load_dwo_tu, per_cu);
13504 /* Free all resources associated with DWO_FILE.
13505 Close the DWO file and munmap the sections. */
13508 free_dwo_file (struct dwo_file *dwo_file)
13510 /* Note: dbfd is NULL for virtual DWO files. */
13511 gdb_bfd_unref (dwo_file->dbfd);
13513 VEC_free (dwarf2_section_info_def, dwo_file->sections.types);
13516 /* Traversal function for free_dwo_files. */
13519 free_dwo_file_from_slot (void **slot, void *info)
13521 struct dwo_file *dwo_file = (struct dwo_file *) *slot;
13523 free_dwo_file (dwo_file);
13528 /* Free all resources associated with DWO_FILES. */
13531 free_dwo_files (htab_t dwo_files, struct objfile *objfile)
13533 htab_traverse_noresize (dwo_files, free_dwo_file_from_slot, objfile);
13536 /* Read in various DIEs. */
13538 /* DW_AT_abstract_origin inherits whole DIEs (not just their attributes).
13539 Inherit only the children of the DW_AT_abstract_origin DIE not being
13540 already referenced by DW_AT_abstract_origin from the children of the
13544 inherit_abstract_dies (struct die_info *die, struct dwarf2_cu *cu)
13546 struct die_info *child_die;
13547 sect_offset *offsetp;
13548 /* Parent of DIE - referenced by DW_AT_abstract_origin. */
13549 struct die_info *origin_die;
13550 /* Iterator of the ORIGIN_DIE children. */
13551 struct die_info *origin_child_die;
13552 struct attribute *attr;
13553 struct dwarf2_cu *origin_cu;
13554 struct pending **origin_previous_list_in_scope;
13556 attr = dwarf2_attr (die, DW_AT_abstract_origin, cu);
13560 /* Note that following die references may follow to a die in a
13564 origin_die = follow_die_ref (die, attr, &origin_cu);
13566 /* We're inheriting ORIGIN's children into the scope we'd put DIE's
13568 origin_previous_list_in_scope = origin_cu->list_in_scope;
13569 origin_cu->list_in_scope = cu->list_in_scope;
13571 if (die->tag != origin_die->tag
13572 && !(die->tag == DW_TAG_inlined_subroutine
13573 && origin_die->tag == DW_TAG_subprogram))
13574 complaint (_("DIE %s and its abstract origin %s have different tags"),
13575 sect_offset_str (die->sect_off),
13576 sect_offset_str (origin_die->sect_off));
13578 std::vector<sect_offset> offsets;
13580 for (child_die = die->child;
13581 child_die && child_die->tag;
13582 child_die = sibling_die (child_die))
13584 struct die_info *child_origin_die;
13585 struct dwarf2_cu *child_origin_cu;
13587 /* We are trying to process concrete instance entries:
13588 DW_TAG_call_site DIEs indeed have a DW_AT_abstract_origin tag, but
13589 it's not relevant to our analysis here. i.e. detecting DIEs that are
13590 present in the abstract instance but not referenced in the concrete
13592 if (child_die->tag == DW_TAG_call_site
13593 || child_die->tag == DW_TAG_GNU_call_site)
13596 /* For each CHILD_DIE, find the corresponding child of
13597 ORIGIN_DIE. If there is more than one layer of
13598 DW_AT_abstract_origin, follow them all; there shouldn't be,
13599 but GCC versions at least through 4.4 generate this (GCC PR
13601 child_origin_die = child_die;
13602 child_origin_cu = cu;
13605 attr = dwarf2_attr (child_origin_die, DW_AT_abstract_origin,
13609 child_origin_die = follow_die_ref (child_origin_die, attr,
13613 /* According to DWARF3 3.3.8.2 #3 new entries without their abstract
13614 counterpart may exist. */
13615 if (child_origin_die != child_die)
13617 if (child_die->tag != child_origin_die->tag
13618 && !(child_die->tag == DW_TAG_inlined_subroutine
13619 && child_origin_die->tag == DW_TAG_subprogram))
13620 complaint (_("Child DIE %s and its abstract origin %s have "
13622 sect_offset_str (child_die->sect_off),
13623 sect_offset_str (child_origin_die->sect_off));
13624 if (child_origin_die->parent != origin_die)
13625 complaint (_("Child DIE %s and its abstract origin %s have "
13626 "different parents"),
13627 sect_offset_str (child_die->sect_off),
13628 sect_offset_str (child_origin_die->sect_off));
13630 offsets.push_back (child_origin_die->sect_off);
13633 std::sort (offsets.begin (), offsets.end ());
13634 sect_offset *offsets_end = offsets.data () + offsets.size ();
13635 for (offsetp = offsets.data () + 1; offsetp < offsets_end; offsetp++)
13636 if (offsetp[-1] == *offsetp)
13637 complaint (_("Multiple children of DIE %s refer "
13638 "to DIE %s as their abstract origin"),
13639 sect_offset_str (die->sect_off), sect_offset_str (*offsetp));
13641 offsetp = offsets.data ();
13642 origin_child_die = origin_die->child;
13643 while (origin_child_die && origin_child_die->tag)
13645 /* Is ORIGIN_CHILD_DIE referenced by any of the DIE children? */
13646 while (offsetp < offsets_end
13647 && *offsetp < origin_child_die->sect_off)
13649 if (offsetp >= offsets_end
13650 || *offsetp > origin_child_die->sect_off)
13652 /* Found that ORIGIN_CHILD_DIE is really not referenced.
13653 Check whether we're already processing ORIGIN_CHILD_DIE.
13654 This can happen with mutually referenced abstract_origins.
13656 if (!origin_child_die->in_process)
13657 process_die (origin_child_die, origin_cu);
13659 origin_child_die = sibling_die (origin_child_die);
13661 origin_cu->list_in_scope = origin_previous_list_in_scope;
13665 read_func_scope (struct die_info *die, struct dwarf2_cu *cu)
13667 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
13668 struct gdbarch *gdbarch = get_objfile_arch (objfile);
13669 struct context_stack *newobj;
13672 struct die_info *child_die;
13673 struct attribute *attr, *call_line, *call_file;
13675 CORE_ADDR baseaddr;
13676 struct block *block;
13677 int inlined_func = (die->tag == DW_TAG_inlined_subroutine);
13678 std::vector<struct symbol *> template_args;
13679 struct template_symbol *templ_func = NULL;
13683 /* If we do not have call site information, we can't show the
13684 caller of this inlined function. That's too confusing, so
13685 only use the scope for local variables. */
13686 call_line = dwarf2_attr (die, DW_AT_call_line, cu);
13687 call_file = dwarf2_attr (die, DW_AT_call_file, cu);
13688 if (call_line == NULL || call_file == NULL)
13690 read_lexical_block_scope (die, cu);
13695 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
13697 name = dwarf2_name (die, cu);
13699 /* Ignore functions with missing or empty names. These are actually
13700 illegal according to the DWARF standard. */
13703 complaint (_("missing name for subprogram DIE at %s"),
13704 sect_offset_str (die->sect_off));
13708 /* Ignore functions with missing or invalid low and high pc attributes. */
13709 if (dwarf2_get_pc_bounds (die, &lowpc, &highpc, cu, NULL)
13710 <= PC_BOUNDS_INVALID)
13712 attr = dwarf2_attr (die, DW_AT_external, cu);
13713 if (!attr || !DW_UNSND (attr))
13714 complaint (_("cannot get low and high bounds "
13715 "for subprogram DIE at %s"),
13716 sect_offset_str (die->sect_off));
13720 lowpc = gdbarch_adjust_dwarf2_addr (gdbarch, lowpc + baseaddr);
13721 highpc = gdbarch_adjust_dwarf2_addr (gdbarch, highpc + baseaddr);
13723 /* If we have any template arguments, then we must allocate a
13724 different sort of symbol. */
13725 for (child_die = die->child; child_die; child_die = sibling_die (child_die))
13727 if (child_die->tag == DW_TAG_template_type_param
13728 || child_die->tag == DW_TAG_template_value_param)
13730 templ_func = allocate_template_symbol (objfile);
13731 templ_func->subclass = SYMBOL_TEMPLATE;
13736 newobj = cu->get_builder ()->push_context (0, lowpc);
13737 newobj->name = new_symbol (die, read_type_die (die, cu), cu,
13738 (struct symbol *) templ_func);
13740 /* If there is a location expression for DW_AT_frame_base, record
13742 attr = dwarf2_attr (die, DW_AT_frame_base, cu);
13744 dwarf2_symbol_mark_computed (attr, newobj->name, cu, 1);
13746 /* If there is a location for the static link, record it. */
13747 newobj->static_link = NULL;
13748 attr = dwarf2_attr (die, DW_AT_static_link, cu);
13751 newobj->static_link
13752 = XOBNEW (&objfile->objfile_obstack, struct dynamic_prop);
13753 attr_to_dynamic_prop (attr, die, cu, newobj->static_link);
13756 cu->list_in_scope = cu->get_builder ()->get_local_symbols ();
13758 if (die->child != NULL)
13760 child_die = die->child;
13761 while (child_die && child_die->tag)
13763 if (child_die->tag == DW_TAG_template_type_param
13764 || child_die->tag == DW_TAG_template_value_param)
13766 struct symbol *arg = new_symbol (child_die, NULL, cu);
13769 template_args.push_back (arg);
13772 process_die (child_die, cu);
13773 child_die = sibling_die (child_die);
13777 inherit_abstract_dies (die, cu);
13779 /* If we have a DW_AT_specification, we might need to import using
13780 directives from the context of the specification DIE. See the
13781 comment in determine_prefix. */
13782 if (cu->language == language_cplus
13783 && dwarf2_attr (die, DW_AT_specification, cu))
13785 struct dwarf2_cu *spec_cu = cu;
13786 struct die_info *spec_die = die_specification (die, &spec_cu);
13790 child_die = spec_die->child;
13791 while (child_die && child_die->tag)
13793 if (child_die->tag == DW_TAG_imported_module)
13794 process_die (child_die, spec_cu);
13795 child_die = sibling_die (child_die);
13798 /* In some cases, GCC generates specification DIEs that
13799 themselves contain DW_AT_specification attributes. */
13800 spec_die = die_specification (spec_die, &spec_cu);
13804 struct context_stack cstk = cu->get_builder ()->pop_context ();
13805 /* Make a block for the local symbols within. */
13806 block = cu->get_builder ()->finish_block (cstk.name, cstk.old_blocks,
13807 cstk.static_link, lowpc, highpc);
13809 /* For C++, set the block's scope. */
13810 if ((cu->language == language_cplus
13811 || cu->language == language_fortran
13812 || cu->language == language_d
13813 || cu->language == language_rust)
13814 && cu->processing_has_namespace_info)
13815 block_set_scope (block, determine_prefix (die, cu),
13816 &objfile->objfile_obstack);
13818 /* If we have address ranges, record them. */
13819 dwarf2_record_block_ranges (die, block, baseaddr, cu);
13821 gdbarch_make_symbol_special (gdbarch, cstk.name, objfile);
13823 /* Attach template arguments to function. */
13824 if (!template_args.empty ())
13826 gdb_assert (templ_func != NULL);
13828 templ_func->n_template_arguments = template_args.size ();
13829 templ_func->template_arguments
13830 = XOBNEWVEC (&objfile->objfile_obstack, struct symbol *,
13831 templ_func->n_template_arguments);
13832 memcpy (templ_func->template_arguments,
13833 template_args.data (),
13834 (templ_func->n_template_arguments * sizeof (struct symbol *)));
13836 /* Make sure that the symtab is set on the new symbols. Even
13837 though they don't appear in this symtab directly, other parts
13838 of gdb assume that symbols do, and this is reasonably
13840 for (symbol *sym : template_args)
13841 symbol_set_symtab (sym, symbol_symtab (templ_func));
13844 /* In C++, we can have functions nested inside functions (e.g., when
13845 a function declares a class that has methods). This means that
13846 when we finish processing a function scope, we may need to go
13847 back to building a containing block's symbol lists. */
13848 *cu->get_builder ()->get_local_symbols () = cstk.locals;
13849 cu->get_builder ()->set_local_using_directives (cstk.local_using_directives);
13851 /* If we've finished processing a top-level function, subsequent
13852 symbols go in the file symbol list. */
13853 if (cu->get_builder ()->outermost_context_p ())
13854 cu->list_in_scope = cu->get_builder ()->get_file_symbols ();
13857 /* Process all the DIES contained within a lexical block scope. Start
13858 a new scope, process the dies, and then close the scope. */
13861 read_lexical_block_scope (struct die_info *die, struct dwarf2_cu *cu)
13863 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
13864 struct gdbarch *gdbarch = get_objfile_arch (objfile);
13865 CORE_ADDR lowpc, highpc;
13866 struct die_info *child_die;
13867 CORE_ADDR baseaddr;
13869 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
13871 /* Ignore blocks with missing or invalid low and high pc attributes. */
13872 /* ??? Perhaps consider discontiguous blocks defined by DW_AT_ranges
13873 as multiple lexical blocks? Handling children in a sane way would
13874 be nasty. Might be easier to properly extend generic blocks to
13875 describe ranges. */
13876 switch (dwarf2_get_pc_bounds (die, &lowpc, &highpc, cu, NULL))
13878 case PC_BOUNDS_NOT_PRESENT:
13879 /* DW_TAG_lexical_block has no attributes, process its children as if
13880 there was no wrapping by that DW_TAG_lexical_block.
13881 GCC does no longer produces such DWARF since GCC r224161. */
13882 for (child_die = die->child;
13883 child_die != NULL && child_die->tag;
13884 child_die = sibling_die (child_die))
13885 process_die (child_die, cu);
13887 case PC_BOUNDS_INVALID:
13890 lowpc = gdbarch_adjust_dwarf2_addr (gdbarch, lowpc + baseaddr);
13891 highpc = gdbarch_adjust_dwarf2_addr (gdbarch, highpc + baseaddr);
13893 cu->get_builder ()->push_context (0, lowpc);
13894 if (die->child != NULL)
13896 child_die = die->child;
13897 while (child_die && child_die->tag)
13899 process_die (child_die, cu);
13900 child_die = sibling_die (child_die);
13903 inherit_abstract_dies (die, cu);
13904 struct context_stack cstk = cu->get_builder ()->pop_context ();
13906 if (*cu->get_builder ()->get_local_symbols () != NULL
13907 || (*cu->get_builder ()->get_local_using_directives ()) != NULL)
13909 struct block *block
13910 = cu->get_builder ()->finish_block (0, cstk.old_blocks, NULL,
13911 cstk.start_addr, highpc);
13913 /* Note that recording ranges after traversing children, as we
13914 do here, means that recording a parent's ranges entails
13915 walking across all its children's ranges as they appear in
13916 the address map, which is quadratic behavior.
13918 It would be nicer to record the parent's ranges before
13919 traversing its children, simply overriding whatever you find
13920 there. But since we don't even decide whether to create a
13921 block until after we've traversed its children, that's hard
13923 dwarf2_record_block_ranges (die, block, baseaddr, cu);
13925 *cu->get_builder ()->get_local_symbols () = cstk.locals;
13926 cu->get_builder ()->set_local_using_directives (cstk.local_using_directives);
13929 /* Read in DW_TAG_call_site and insert it to CU->call_site_htab. */
13932 read_call_site_scope (struct die_info *die, struct dwarf2_cu *cu)
13934 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
13935 struct gdbarch *gdbarch = get_objfile_arch (objfile);
13936 CORE_ADDR pc, baseaddr;
13937 struct attribute *attr;
13938 struct call_site *call_site, call_site_local;
13941 struct die_info *child_die;
13943 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
13945 attr = dwarf2_attr (die, DW_AT_call_return_pc, cu);
13948 /* This was a pre-DWARF-5 GNU extension alias
13949 for DW_AT_call_return_pc. */
13950 attr = dwarf2_attr (die, DW_AT_low_pc, cu);
13954 complaint (_("missing DW_AT_call_return_pc for DW_TAG_call_site "
13955 "DIE %s [in module %s]"),
13956 sect_offset_str (die->sect_off), objfile_name (objfile));
13959 pc = attr_value_as_address (attr) + baseaddr;
13960 pc = gdbarch_adjust_dwarf2_addr (gdbarch, pc);
13962 if (cu->call_site_htab == NULL)
13963 cu->call_site_htab = htab_create_alloc_ex (16, core_addr_hash, core_addr_eq,
13964 NULL, &objfile->objfile_obstack,
13965 hashtab_obstack_allocate, NULL);
13966 call_site_local.pc = pc;
13967 slot = htab_find_slot (cu->call_site_htab, &call_site_local, INSERT);
13970 complaint (_("Duplicate PC %s for DW_TAG_call_site "
13971 "DIE %s [in module %s]"),
13972 paddress (gdbarch, pc), sect_offset_str (die->sect_off),
13973 objfile_name (objfile));
13977 /* Count parameters at the caller. */
13980 for (child_die = die->child; child_die && child_die->tag;
13981 child_die = sibling_die (child_die))
13983 if (child_die->tag != DW_TAG_call_site_parameter
13984 && child_die->tag != DW_TAG_GNU_call_site_parameter)
13986 complaint (_("Tag %d is not DW_TAG_call_site_parameter in "
13987 "DW_TAG_call_site child DIE %s [in module %s]"),
13988 child_die->tag, sect_offset_str (child_die->sect_off),
13989 objfile_name (objfile));
13997 = ((struct call_site *)
13998 obstack_alloc (&objfile->objfile_obstack,
13999 sizeof (*call_site)
14000 + (sizeof (*call_site->parameter) * (nparams - 1))));
14002 memset (call_site, 0, sizeof (*call_site) - sizeof (*call_site->parameter));
14003 call_site->pc = pc;
14005 if (dwarf2_flag_true_p (die, DW_AT_call_tail_call, cu)
14006 || dwarf2_flag_true_p (die, DW_AT_GNU_tail_call, cu))
14008 struct die_info *func_die;
14010 /* Skip also over DW_TAG_inlined_subroutine. */
14011 for (func_die = die->parent;
14012 func_die && func_die->tag != DW_TAG_subprogram
14013 && func_die->tag != DW_TAG_subroutine_type;
14014 func_die = func_die->parent);
14016 /* DW_AT_call_all_calls is a superset
14017 of DW_AT_call_all_tail_calls. */
14019 && !dwarf2_flag_true_p (func_die, DW_AT_call_all_calls, cu)
14020 && !dwarf2_flag_true_p (func_die, DW_AT_GNU_all_call_sites, cu)
14021 && !dwarf2_flag_true_p (func_die, DW_AT_call_all_tail_calls, cu)
14022 && !dwarf2_flag_true_p (func_die, DW_AT_GNU_all_tail_call_sites, cu))
14024 /* TYPE_TAIL_CALL_LIST is not interesting in functions where it is
14025 not complete. But keep CALL_SITE for look ups via call_site_htab,
14026 both the initial caller containing the real return address PC and
14027 the final callee containing the current PC of a chain of tail
14028 calls do not need to have the tail call list complete. But any
14029 function candidate for a virtual tail call frame searched via
14030 TYPE_TAIL_CALL_LIST must have the tail call list complete to be
14031 determined unambiguously. */
14035 struct type *func_type = NULL;
14038 func_type = get_die_type (func_die, cu);
14039 if (func_type != NULL)
14041 gdb_assert (TYPE_CODE (func_type) == TYPE_CODE_FUNC);
14043 /* Enlist this call site to the function. */
14044 call_site->tail_call_next = TYPE_TAIL_CALL_LIST (func_type);
14045 TYPE_TAIL_CALL_LIST (func_type) = call_site;
14048 complaint (_("Cannot find function owning DW_TAG_call_site "
14049 "DIE %s [in module %s]"),
14050 sect_offset_str (die->sect_off), objfile_name (objfile));
14054 attr = dwarf2_attr (die, DW_AT_call_target, cu);
14056 attr = dwarf2_attr (die, DW_AT_GNU_call_site_target, cu);
14058 attr = dwarf2_attr (die, DW_AT_call_origin, cu);
14061 /* This was a pre-DWARF-5 GNU extension alias for DW_AT_call_origin. */
14062 attr = dwarf2_attr (die, DW_AT_abstract_origin, cu);
14064 SET_FIELD_DWARF_BLOCK (call_site->target, NULL);
14065 if (!attr || (attr_form_is_block (attr) && DW_BLOCK (attr)->size == 0))
14066 /* Keep NULL DWARF_BLOCK. */;
14067 else if (attr_form_is_block (attr))
14069 struct dwarf2_locexpr_baton *dlbaton;
14071 dlbaton = XOBNEW (&objfile->objfile_obstack, struct dwarf2_locexpr_baton);
14072 dlbaton->data = DW_BLOCK (attr)->data;
14073 dlbaton->size = DW_BLOCK (attr)->size;
14074 dlbaton->per_cu = cu->per_cu;
14076 SET_FIELD_DWARF_BLOCK (call_site->target, dlbaton);
14078 else if (attr_form_is_ref (attr))
14080 struct dwarf2_cu *target_cu = cu;
14081 struct die_info *target_die;
14083 target_die = follow_die_ref (die, attr, &target_cu);
14084 gdb_assert (target_cu->per_cu->dwarf2_per_objfile->objfile == objfile);
14085 if (die_is_declaration (target_die, target_cu))
14087 const char *target_physname;
14089 /* Prefer the mangled name; otherwise compute the demangled one. */
14090 target_physname = dw2_linkage_name (target_die, target_cu);
14091 if (target_physname == NULL)
14092 target_physname = dwarf2_physname (NULL, target_die, target_cu);
14093 if (target_physname == NULL)
14094 complaint (_("DW_AT_call_target target DIE has invalid "
14095 "physname, for referencing DIE %s [in module %s]"),
14096 sect_offset_str (die->sect_off), objfile_name (objfile));
14098 SET_FIELD_PHYSNAME (call_site->target, target_physname);
14104 /* DW_AT_entry_pc should be preferred. */
14105 if (dwarf2_get_pc_bounds (target_die, &lowpc, NULL, target_cu, NULL)
14106 <= PC_BOUNDS_INVALID)
14107 complaint (_("DW_AT_call_target target DIE has invalid "
14108 "low pc, for referencing DIE %s [in module %s]"),
14109 sect_offset_str (die->sect_off), objfile_name (objfile));
14112 lowpc = gdbarch_adjust_dwarf2_addr (gdbarch, lowpc + baseaddr);
14113 SET_FIELD_PHYSADDR (call_site->target, lowpc);
14118 complaint (_("DW_TAG_call_site DW_AT_call_target is neither "
14119 "block nor reference, for DIE %s [in module %s]"),
14120 sect_offset_str (die->sect_off), objfile_name (objfile));
14122 call_site->per_cu = cu->per_cu;
14124 for (child_die = die->child;
14125 child_die && child_die->tag;
14126 child_die = sibling_die (child_die))
14128 struct call_site_parameter *parameter;
14129 struct attribute *loc, *origin;
14131 if (child_die->tag != DW_TAG_call_site_parameter
14132 && child_die->tag != DW_TAG_GNU_call_site_parameter)
14134 /* Already printed the complaint above. */
14138 gdb_assert (call_site->parameter_count < nparams);
14139 parameter = &call_site->parameter[call_site->parameter_count];
14141 /* DW_AT_location specifies the register number or DW_AT_abstract_origin
14142 specifies DW_TAG_formal_parameter. Value of the data assumed for the
14143 register is contained in DW_AT_call_value. */
14145 loc = dwarf2_attr (child_die, DW_AT_location, cu);
14146 origin = dwarf2_attr (child_die, DW_AT_call_parameter, cu);
14147 if (origin == NULL)
14149 /* This was a pre-DWARF-5 GNU extension alias
14150 for DW_AT_call_parameter. */
14151 origin = dwarf2_attr (child_die, DW_AT_abstract_origin, cu);
14153 if (loc == NULL && origin != NULL && attr_form_is_ref (origin))
14155 parameter->kind = CALL_SITE_PARAMETER_PARAM_OFFSET;
14157 sect_offset sect_off
14158 = (sect_offset) dwarf2_get_ref_die_offset (origin);
14159 if (!offset_in_cu_p (&cu->header, sect_off))
14161 /* As DW_OP_GNU_parameter_ref uses CU-relative offset this
14162 binding can be done only inside one CU. Such referenced DIE
14163 therefore cannot be even moved to DW_TAG_partial_unit. */
14164 complaint (_("DW_AT_call_parameter offset is not in CU for "
14165 "DW_TAG_call_site child DIE %s [in module %s]"),
14166 sect_offset_str (child_die->sect_off),
14167 objfile_name (objfile));
14170 parameter->u.param_cu_off
14171 = (cu_offset) (sect_off - cu->header.sect_off);
14173 else if (loc == NULL || origin != NULL || !attr_form_is_block (loc))
14175 complaint (_("No DW_FORM_block* DW_AT_location for "
14176 "DW_TAG_call_site child DIE %s [in module %s]"),
14177 sect_offset_str (child_die->sect_off), objfile_name (objfile));
14182 parameter->u.dwarf_reg = dwarf_block_to_dwarf_reg
14183 (DW_BLOCK (loc)->data, &DW_BLOCK (loc)->data[DW_BLOCK (loc)->size]);
14184 if (parameter->u.dwarf_reg != -1)
14185 parameter->kind = CALL_SITE_PARAMETER_DWARF_REG;
14186 else if (dwarf_block_to_sp_offset (gdbarch, DW_BLOCK (loc)->data,
14187 &DW_BLOCK (loc)->data[DW_BLOCK (loc)->size],
14188 ¶meter->u.fb_offset))
14189 parameter->kind = CALL_SITE_PARAMETER_FB_OFFSET;
14192 complaint (_("Only single DW_OP_reg or DW_OP_fbreg is supported "
14193 "for DW_FORM_block* DW_AT_location is supported for "
14194 "DW_TAG_call_site child DIE %s "
14196 sect_offset_str (child_die->sect_off),
14197 objfile_name (objfile));
14202 attr = dwarf2_attr (child_die, DW_AT_call_value, cu);
14204 attr = dwarf2_attr (child_die, DW_AT_GNU_call_site_value, cu);
14205 if (!attr_form_is_block (attr))
14207 complaint (_("No DW_FORM_block* DW_AT_call_value for "
14208 "DW_TAG_call_site child DIE %s [in module %s]"),
14209 sect_offset_str (child_die->sect_off),
14210 objfile_name (objfile));
14213 parameter->value = DW_BLOCK (attr)->data;
14214 parameter->value_size = DW_BLOCK (attr)->size;
14216 /* Parameters are not pre-cleared by memset above. */
14217 parameter->data_value = NULL;
14218 parameter->data_value_size = 0;
14219 call_site->parameter_count++;
14221 attr = dwarf2_attr (child_die, DW_AT_call_data_value, cu);
14223 attr = dwarf2_attr (child_die, DW_AT_GNU_call_site_data_value, cu);
14226 if (!attr_form_is_block (attr))
14227 complaint (_("No DW_FORM_block* DW_AT_call_data_value for "
14228 "DW_TAG_call_site child DIE %s [in module %s]"),
14229 sect_offset_str (child_die->sect_off),
14230 objfile_name (objfile));
14233 parameter->data_value = DW_BLOCK (attr)->data;
14234 parameter->data_value_size = DW_BLOCK (attr)->size;
14240 /* Helper function for read_variable. If DIE represents a virtual
14241 table, then return the type of the concrete object that is
14242 associated with the virtual table. Otherwise, return NULL. */
14244 static struct type *
14245 rust_containing_type (struct die_info *die, struct dwarf2_cu *cu)
14247 struct attribute *attr = dwarf2_attr (die, DW_AT_type, cu);
14251 /* Find the type DIE. */
14252 struct die_info *type_die = NULL;
14253 struct dwarf2_cu *type_cu = cu;
14255 if (attr_form_is_ref (attr))
14256 type_die = follow_die_ref (die, attr, &type_cu);
14257 if (type_die == NULL)
14260 if (dwarf2_attr (type_die, DW_AT_containing_type, type_cu) == NULL)
14262 return die_containing_type (type_die, type_cu);
14265 /* Read a variable (DW_TAG_variable) DIE and create a new symbol. */
14268 read_variable (struct die_info *die, struct dwarf2_cu *cu)
14270 struct rust_vtable_symbol *storage = NULL;
14272 if (cu->language == language_rust)
14274 struct type *containing_type = rust_containing_type (die, cu);
14276 if (containing_type != NULL)
14278 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
14280 storage = OBSTACK_ZALLOC (&objfile->objfile_obstack,
14281 struct rust_vtable_symbol);
14282 initialize_objfile_symbol (storage);
14283 storage->concrete_type = containing_type;
14284 storage->subclass = SYMBOL_RUST_VTABLE;
14288 struct symbol *res = new_symbol (die, NULL, cu, storage);
14289 struct attribute *abstract_origin
14290 = dwarf2_attr (die, DW_AT_abstract_origin, cu);
14291 struct attribute *loc = dwarf2_attr (die, DW_AT_location, cu);
14292 if (res == NULL && loc && abstract_origin)
14294 /* We have a variable without a name, but with a location and an abstract
14295 origin. This may be a concrete instance of an abstract variable
14296 referenced from an DW_OP_GNU_variable_value, so save it to find it back
14298 struct dwarf2_cu *origin_cu = cu;
14299 struct die_info *origin_die
14300 = follow_die_ref (die, abstract_origin, &origin_cu);
14301 dwarf2_per_objfile *dpo = cu->per_cu->dwarf2_per_objfile;
14302 dpo->abstract_to_concrete[origin_die].push_back (die);
14306 /* Call CALLBACK from DW_AT_ranges attribute value OFFSET
14307 reading .debug_rnglists.
14308 Callback's type should be:
14309 void (CORE_ADDR range_beginning, CORE_ADDR range_end)
14310 Return true if the attributes are present and valid, otherwise,
14313 template <typename Callback>
14315 dwarf2_rnglists_process (unsigned offset, struct dwarf2_cu *cu,
14316 Callback &&callback)
14318 struct dwarf2_per_objfile *dwarf2_per_objfile
14319 = cu->per_cu->dwarf2_per_objfile;
14320 struct objfile *objfile = dwarf2_per_objfile->objfile;
14321 bfd *obfd = objfile->obfd;
14322 /* Base address selection entry. */
14325 const gdb_byte *buffer;
14326 CORE_ADDR baseaddr;
14327 bool overflow = false;
14329 found_base = cu->base_known;
14330 base = cu->base_address;
14332 dwarf2_read_section (objfile, &dwarf2_per_objfile->rnglists);
14333 if (offset >= dwarf2_per_objfile->rnglists.size)
14335 complaint (_("Offset %d out of bounds for DW_AT_ranges attribute"),
14339 buffer = dwarf2_per_objfile->rnglists.buffer + offset;
14341 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
14345 /* Initialize it due to a false compiler warning. */
14346 CORE_ADDR range_beginning = 0, range_end = 0;
14347 const gdb_byte *buf_end = (dwarf2_per_objfile->rnglists.buffer
14348 + dwarf2_per_objfile->rnglists.size);
14349 unsigned int bytes_read;
14351 if (buffer == buf_end)
14356 const auto rlet = static_cast<enum dwarf_range_list_entry>(*buffer++);
14359 case DW_RLE_end_of_list:
14361 case DW_RLE_base_address:
14362 if (buffer + cu->header.addr_size > buf_end)
14367 base = read_address (obfd, buffer, cu, &bytes_read);
14369 buffer += bytes_read;
14371 case DW_RLE_start_length:
14372 if (buffer + cu->header.addr_size > buf_end)
14377 range_beginning = read_address (obfd, buffer, cu, &bytes_read);
14378 buffer += bytes_read;
14379 range_end = (range_beginning
14380 + read_unsigned_leb128 (obfd, buffer, &bytes_read));
14381 buffer += bytes_read;
14382 if (buffer > buf_end)
14388 case DW_RLE_offset_pair:
14389 range_beginning = read_unsigned_leb128 (obfd, buffer, &bytes_read);
14390 buffer += bytes_read;
14391 if (buffer > buf_end)
14396 range_end = read_unsigned_leb128 (obfd, buffer, &bytes_read);
14397 buffer += bytes_read;
14398 if (buffer > buf_end)
14404 case DW_RLE_start_end:
14405 if (buffer + 2 * cu->header.addr_size > buf_end)
14410 range_beginning = read_address (obfd, buffer, cu, &bytes_read);
14411 buffer += bytes_read;
14412 range_end = read_address (obfd, buffer, cu, &bytes_read);
14413 buffer += bytes_read;
14416 complaint (_("Invalid .debug_rnglists data (no base address)"));
14419 if (rlet == DW_RLE_end_of_list || overflow)
14421 if (rlet == DW_RLE_base_address)
14426 /* We have no valid base address for the ranges
14428 complaint (_("Invalid .debug_rnglists data (no base address)"));
14432 if (range_beginning > range_end)
14434 /* Inverted range entries are invalid. */
14435 complaint (_("Invalid .debug_rnglists data (inverted range)"));
14439 /* Empty range entries have no effect. */
14440 if (range_beginning == range_end)
14443 range_beginning += base;
14446 /* A not-uncommon case of bad debug info.
14447 Don't pollute the addrmap with bad data. */
14448 if (range_beginning + baseaddr == 0
14449 && !dwarf2_per_objfile->has_section_at_zero)
14451 complaint (_(".debug_rnglists entry has start address of zero"
14452 " [in module %s]"), objfile_name (objfile));
14456 callback (range_beginning, range_end);
14461 complaint (_("Offset %d is not terminated "
14462 "for DW_AT_ranges attribute"),
14470 /* Call CALLBACK from DW_AT_ranges attribute value OFFSET reading .debug_ranges.
14471 Callback's type should be:
14472 void (CORE_ADDR range_beginning, CORE_ADDR range_end)
14473 Return 1 if the attributes are present and valid, otherwise, return 0. */
14475 template <typename Callback>
14477 dwarf2_ranges_process (unsigned offset, struct dwarf2_cu *cu,
14478 Callback &&callback)
14480 struct dwarf2_per_objfile *dwarf2_per_objfile
14481 = cu->per_cu->dwarf2_per_objfile;
14482 struct objfile *objfile = dwarf2_per_objfile->objfile;
14483 struct comp_unit_head *cu_header = &cu->header;
14484 bfd *obfd = objfile->obfd;
14485 unsigned int addr_size = cu_header->addr_size;
14486 CORE_ADDR mask = ~(~(CORE_ADDR)1 << (addr_size * 8 - 1));
14487 /* Base address selection entry. */
14490 unsigned int dummy;
14491 const gdb_byte *buffer;
14492 CORE_ADDR baseaddr;
14494 if (cu_header->version >= 5)
14495 return dwarf2_rnglists_process (offset, cu, callback);
14497 found_base = cu->base_known;
14498 base = cu->base_address;
14500 dwarf2_read_section (objfile, &dwarf2_per_objfile->ranges);
14501 if (offset >= dwarf2_per_objfile->ranges.size)
14503 complaint (_("Offset %d out of bounds for DW_AT_ranges attribute"),
14507 buffer = dwarf2_per_objfile->ranges.buffer + offset;
14509 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
14513 CORE_ADDR range_beginning, range_end;
14515 range_beginning = read_address (obfd, buffer, cu, &dummy);
14516 buffer += addr_size;
14517 range_end = read_address (obfd, buffer, cu, &dummy);
14518 buffer += addr_size;
14519 offset += 2 * addr_size;
14521 /* An end of list marker is a pair of zero addresses. */
14522 if (range_beginning == 0 && range_end == 0)
14523 /* Found the end of list entry. */
14526 /* Each base address selection entry is a pair of 2 values.
14527 The first is the largest possible address, the second is
14528 the base address. Check for a base address here. */
14529 if ((range_beginning & mask) == mask)
14531 /* If we found the largest possible address, then we already
14532 have the base address in range_end. */
14540 /* We have no valid base address for the ranges
14542 complaint (_("Invalid .debug_ranges data (no base address)"));
14546 if (range_beginning > range_end)
14548 /* Inverted range entries are invalid. */
14549 complaint (_("Invalid .debug_ranges data (inverted range)"));
14553 /* Empty range entries have no effect. */
14554 if (range_beginning == range_end)
14557 range_beginning += base;
14560 /* A not-uncommon case of bad debug info.
14561 Don't pollute the addrmap with bad data. */
14562 if (range_beginning + baseaddr == 0
14563 && !dwarf2_per_objfile->has_section_at_zero)
14565 complaint (_(".debug_ranges entry has start address of zero"
14566 " [in module %s]"), objfile_name (objfile));
14570 callback (range_beginning, range_end);
14576 /* Get low and high pc attributes from DW_AT_ranges attribute value OFFSET.
14577 Return 1 if the attributes are present and valid, otherwise, return 0.
14578 If RANGES_PST is not NULL we should setup `objfile->psymtabs_addrmap'. */
14581 dwarf2_ranges_read (unsigned offset, CORE_ADDR *low_return,
14582 CORE_ADDR *high_return, struct dwarf2_cu *cu,
14583 struct partial_symtab *ranges_pst)
14585 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
14586 struct gdbarch *gdbarch = get_objfile_arch (objfile);
14587 const CORE_ADDR baseaddr = ANOFFSET (objfile->section_offsets,
14588 SECT_OFF_TEXT (objfile));
14591 CORE_ADDR high = 0;
14594 retval = dwarf2_ranges_process (offset, cu,
14595 [&] (CORE_ADDR range_beginning, CORE_ADDR range_end)
14597 if (ranges_pst != NULL)
14602 lowpc = (gdbarch_adjust_dwarf2_addr (gdbarch,
14603 range_beginning + baseaddr)
14605 highpc = (gdbarch_adjust_dwarf2_addr (gdbarch,
14606 range_end + baseaddr)
14608 addrmap_set_empty (objfile->partial_symtabs->psymtabs_addrmap,
14609 lowpc, highpc - 1, ranges_pst);
14612 /* FIXME: This is recording everything as a low-high
14613 segment of consecutive addresses. We should have a
14614 data structure for discontiguous block ranges
14618 low = range_beginning;
14624 if (range_beginning < low)
14625 low = range_beginning;
14626 if (range_end > high)
14634 /* If the first entry is an end-of-list marker, the range
14635 describes an empty scope, i.e. no instructions. */
14641 *high_return = high;
14645 /* Get low and high pc attributes from a die. See enum pc_bounds_kind
14646 definition for the return value. *LOWPC and *HIGHPC are set iff
14647 neither PC_BOUNDS_NOT_PRESENT nor PC_BOUNDS_INVALID are returned. */
14649 static enum pc_bounds_kind
14650 dwarf2_get_pc_bounds (struct die_info *die, CORE_ADDR *lowpc,
14651 CORE_ADDR *highpc, struct dwarf2_cu *cu,
14652 struct partial_symtab *pst)
14654 struct dwarf2_per_objfile *dwarf2_per_objfile
14655 = cu->per_cu->dwarf2_per_objfile;
14656 struct attribute *attr;
14657 struct attribute *attr_high;
14659 CORE_ADDR high = 0;
14660 enum pc_bounds_kind ret;
14662 attr_high = dwarf2_attr (die, DW_AT_high_pc, cu);
14665 attr = dwarf2_attr (die, DW_AT_low_pc, cu);
14668 low = attr_value_as_address (attr);
14669 high = attr_value_as_address (attr_high);
14670 if (cu->header.version >= 4 && attr_form_is_constant (attr_high))
14674 /* Found high w/o low attribute. */
14675 return PC_BOUNDS_INVALID;
14677 /* Found consecutive range of addresses. */
14678 ret = PC_BOUNDS_HIGH_LOW;
14682 attr = dwarf2_attr (die, DW_AT_ranges, cu);
14685 /* DW_AT_ranges_base does not apply to DIEs from the DWO skeleton.
14686 We take advantage of the fact that DW_AT_ranges does not appear
14687 in DW_TAG_compile_unit of DWO files. */
14688 int need_ranges_base = die->tag != DW_TAG_compile_unit;
14689 unsigned int ranges_offset = (DW_UNSND (attr)
14690 + (need_ranges_base
14694 /* Value of the DW_AT_ranges attribute is the offset in the
14695 .debug_ranges section. */
14696 if (!dwarf2_ranges_read (ranges_offset, &low, &high, cu, pst))
14697 return PC_BOUNDS_INVALID;
14698 /* Found discontinuous range of addresses. */
14699 ret = PC_BOUNDS_RANGES;
14702 return PC_BOUNDS_NOT_PRESENT;
14705 /* partial_die_info::read has also the strict LOW < HIGH requirement. */
14707 return PC_BOUNDS_INVALID;
14709 /* When using the GNU linker, .gnu.linkonce. sections are used to
14710 eliminate duplicate copies of functions and vtables and such.
14711 The linker will arbitrarily choose one and discard the others.
14712 The AT_*_pc values for such functions refer to local labels in
14713 these sections. If the section from that file was discarded, the
14714 labels are not in the output, so the relocs get a value of 0.
14715 If this is a discarded function, mark the pc bounds as invalid,
14716 so that GDB will ignore it. */
14717 if (low == 0 && !dwarf2_per_objfile->has_section_at_zero)
14718 return PC_BOUNDS_INVALID;
14726 /* Assuming that DIE represents a subprogram DIE or a lexical block, get
14727 its low and high PC addresses. Do nothing if these addresses could not
14728 be determined. Otherwise, set LOWPC to the low address if it is smaller,
14729 and HIGHPC to the high address if greater than HIGHPC. */
14732 dwarf2_get_subprogram_pc_bounds (struct die_info *die,
14733 CORE_ADDR *lowpc, CORE_ADDR *highpc,
14734 struct dwarf2_cu *cu)
14736 CORE_ADDR low, high;
14737 struct die_info *child = die->child;
14739 if (dwarf2_get_pc_bounds (die, &low, &high, cu, NULL) >= PC_BOUNDS_RANGES)
14741 *lowpc = std::min (*lowpc, low);
14742 *highpc = std::max (*highpc, high);
14745 /* If the language does not allow nested subprograms (either inside
14746 subprograms or lexical blocks), we're done. */
14747 if (cu->language != language_ada)
14750 /* Check all the children of the given DIE. If it contains nested
14751 subprograms, then check their pc bounds. Likewise, we need to
14752 check lexical blocks as well, as they may also contain subprogram
14754 while (child && child->tag)
14756 if (child->tag == DW_TAG_subprogram
14757 || child->tag == DW_TAG_lexical_block)
14758 dwarf2_get_subprogram_pc_bounds (child, lowpc, highpc, cu);
14759 child = sibling_die (child);
14763 /* Get the low and high pc's represented by the scope DIE, and store
14764 them in *LOWPC and *HIGHPC. If the correct values can't be
14765 determined, set *LOWPC to -1 and *HIGHPC to 0. */
14768 get_scope_pc_bounds (struct die_info *die,
14769 CORE_ADDR *lowpc, CORE_ADDR *highpc,
14770 struct dwarf2_cu *cu)
14772 CORE_ADDR best_low = (CORE_ADDR) -1;
14773 CORE_ADDR best_high = (CORE_ADDR) 0;
14774 CORE_ADDR current_low, current_high;
14776 if (dwarf2_get_pc_bounds (die, ¤t_low, ¤t_high, cu, NULL)
14777 >= PC_BOUNDS_RANGES)
14779 best_low = current_low;
14780 best_high = current_high;
14784 struct die_info *child = die->child;
14786 while (child && child->tag)
14788 switch (child->tag) {
14789 case DW_TAG_subprogram:
14790 dwarf2_get_subprogram_pc_bounds (child, &best_low, &best_high, cu);
14792 case DW_TAG_namespace:
14793 case DW_TAG_module:
14794 /* FIXME: carlton/2004-01-16: Should we do this for
14795 DW_TAG_class_type/DW_TAG_structure_type, too? I think
14796 that current GCC's always emit the DIEs corresponding
14797 to definitions of methods of classes as children of a
14798 DW_TAG_compile_unit or DW_TAG_namespace (as opposed to
14799 the DIEs giving the declarations, which could be
14800 anywhere). But I don't see any reason why the
14801 standards says that they have to be there. */
14802 get_scope_pc_bounds (child, ¤t_low, ¤t_high, cu);
14804 if (current_low != ((CORE_ADDR) -1))
14806 best_low = std::min (best_low, current_low);
14807 best_high = std::max (best_high, current_high);
14815 child = sibling_die (child);
14820 *highpc = best_high;
14823 /* Record the address ranges for BLOCK, offset by BASEADDR, as given
14827 dwarf2_record_block_ranges (struct die_info *die, struct block *block,
14828 CORE_ADDR baseaddr, struct dwarf2_cu *cu)
14830 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
14831 struct gdbarch *gdbarch = get_objfile_arch (objfile);
14832 struct attribute *attr;
14833 struct attribute *attr_high;
14835 attr_high = dwarf2_attr (die, DW_AT_high_pc, cu);
14838 attr = dwarf2_attr (die, DW_AT_low_pc, cu);
14841 CORE_ADDR low = attr_value_as_address (attr);
14842 CORE_ADDR high = attr_value_as_address (attr_high);
14844 if (cu->header.version >= 4 && attr_form_is_constant (attr_high))
14847 low = gdbarch_adjust_dwarf2_addr (gdbarch, low + baseaddr);
14848 high = gdbarch_adjust_dwarf2_addr (gdbarch, high + baseaddr);
14849 cu->get_builder ()->record_block_range (block, low, high - 1);
14853 attr = dwarf2_attr (die, DW_AT_ranges, cu);
14856 /* DW_AT_ranges_base does not apply to DIEs from the DWO skeleton.
14857 We take advantage of the fact that DW_AT_ranges does not appear
14858 in DW_TAG_compile_unit of DWO files. */
14859 int need_ranges_base = die->tag != DW_TAG_compile_unit;
14861 /* The value of the DW_AT_ranges attribute is the offset of the
14862 address range list in the .debug_ranges section. */
14863 unsigned long offset = (DW_UNSND (attr)
14864 + (need_ranges_base ? cu->ranges_base : 0));
14866 std::vector<blockrange> blockvec;
14867 dwarf2_ranges_process (offset, cu,
14868 [&] (CORE_ADDR start, CORE_ADDR end)
14872 start = gdbarch_adjust_dwarf2_addr (gdbarch, start);
14873 end = gdbarch_adjust_dwarf2_addr (gdbarch, end);
14874 cu->get_builder ()->record_block_range (block, start, end - 1);
14875 blockvec.emplace_back (start, end);
14878 BLOCK_RANGES(block) = make_blockranges (objfile, blockvec);
14882 /* Check whether the producer field indicates either of GCC < 4.6, or the
14883 Intel C/C++ compiler, and cache the result in CU. */
14886 check_producer (struct dwarf2_cu *cu)
14890 if (cu->producer == NULL)
14892 /* For unknown compilers expect their behavior is DWARF version
14895 GCC started to support .debug_types sections by -gdwarf-4 since
14896 gcc-4.5.x. As the .debug_types sections are missing DW_AT_producer
14897 for their space efficiency GDB cannot workaround gcc-4.5.x -gdwarf-4
14898 combination. gcc-4.5.x -gdwarf-4 binaries have DW_AT_accessibility
14899 interpreted incorrectly by GDB now - GCC PR debug/48229. */
14901 else if (producer_is_gcc (cu->producer, &major, &minor))
14903 cu->producer_is_gxx_lt_4_6 = major < 4 || (major == 4 && minor < 6);
14904 cu->producer_is_gcc_lt_4_3 = major < 4 || (major == 4 && minor < 3);
14906 else if (producer_is_icc (cu->producer, &major, &minor))
14908 cu->producer_is_icc = true;
14909 cu->producer_is_icc_lt_14 = major < 14;
14911 else if (startswith (cu->producer, "CodeWarrior S12/L-ISA"))
14912 cu->producer_is_codewarrior = true;
14915 /* For other non-GCC compilers, expect their behavior is DWARF version
14919 cu->checked_producer = true;
14922 /* Check for GCC PR debug/45124 fix which is not present in any G++ version up
14923 to 4.5.any while it is present already in G++ 4.6.0 - the PR has been fixed
14924 during 4.6.0 experimental. */
14927 producer_is_gxx_lt_4_6 (struct dwarf2_cu *cu)
14929 if (!cu->checked_producer)
14930 check_producer (cu);
14932 return cu->producer_is_gxx_lt_4_6;
14936 /* Codewarrior (at least as of version 5.0.40) generates dwarf line information
14937 with incorrect is_stmt attributes. */
14940 producer_is_codewarrior (struct dwarf2_cu *cu)
14942 if (!cu->checked_producer)
14943 check_producer (cu);
14945 return cu->producer_is_codewarrior;
14948 /* Return the default accessibility type if it is not overriden by
14949 DW_AT_accessibility. */
14951 static enum dwarf_access_attribute
14952 dwarf2_default_access_attribute (struct die_info *die, struct dwarf2_cu *cu)
14954 if (cu->header.version < 3 || producer_is_gxx_lt_4_6 (cu))
14956 /* The default DWARF 2 accessibility for members is public, the default
14957 accessibility for inheritance is private. */
14959 if (die->tag != DW_TAG_inheritance)
14960 return DW_ACCESS_public;
14962 return DW_ACCESS_private;
14966 /* DWARF 3+ defines the default accessibility a different way. The same
14967 rules apply now for DW_TAG_inheritance as for the members and it only
14968 depends on the container kind. */
14970 if (die->parent->tag == DW_TAG_class_type)
14971 return DW_ACCESS_private;
14973 return DW_ACCESS_public;
14977 /* Look for DW_AT_data_member_location. Set *OFFSET to the byte
14978 offset. If the attribute was not found return 0, otherwise return
14979 1. If it was found but could not properly be handled, set *OFFSET
14983 handle_data_member_location (struct die_info *die, struct dwarf2_cu *cu,
14986 struct attribute *attr;
14988 attr = dwarf2_attr (die, DW_AT_data_member_location, cu);
14993 /* Note that we do not check for a section offset first here.
14994 This is because DW_AT_data_member_location is new in DWARF 4,
14995 so if we see it, we can assume that a constant form is really
14996 a constant and not a section offset. */
14997 if (attr_form_is_constant (attr))
14998 *offset = dwarf2_get_attr_constant_value (attr, 0);
14999 else if (attr_form_is_section_offset (attr))
15000 dwarf2_complex_location_expr_complaint ();
15001 else if (attr_form_is_block (attr))
15002 *offset = decode_locdesc (DW_BLOCK (attr), cu);
15004 dwarf2_complex_location_expr_complaint ();
15012 /* Add an aggregate field to the field list. */
15015 dwarf2_add_field (struct field_info *fip, struct die_info *die,
15016 struct dwarf2_cu *cu)
15018 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
15019 struct gdbarch *gdbarch = get_objfile_arch (objfile);
15020 struct nextfield *new_field;
15021 struct attribute *attr;
15023 const char *fieldname = "";
15025 if (die->tag == DW_TAG_inheritance)
15027 fip->baseclasses.emplace_back ();
15028 new_field = &fip->baseclasses.back ();
15032 fip->fields.emplace_back ();
15033 new_field = &fip->fields.back ();
15038 attr = dwarf2_attr (die, DW_AT_accessibility, cu);
15040 new_field->accessibility = DW_UNSND (attr);
15042 new_field->accessibility = dwarf2_default_access_attribute (die, cu);
15043 if (new_field->accessibility != DW_ACCESS_public)
15044 fip->non_public_fields = 1;
15046 attr = dwarf2_attr (die, DW_AT_virtuality, cu);
15048 new_field->virtuality = DW_UNSND (attr);
15050 new_field->virtuality = DW_VIRTUALITY_none;
15052 fp = &new_field->field;
15054 if (die->tag == DW_TAG_member && ! die_is_declaration (die, cu))
15058 /* Data member other than a C++ static data member. */
15060 /* Get type of field. */
15061 fp->type = die_type (die, cu);
15063 SET_FIELD_BITPOS (*fp, 0);
15065 /* Get bit size of field (zero if none). */
15066 attr = dwarf2_attr (die, DW_AT_bit_size, cu);
15069 FIELD_BITSIZE (*fp) = DW_UNSND (attr);
15073 FIELD_BITSIZE (*fp) = 0;
15076 /* Get bit offset of field. */
15077 if (handle_data_member_location (die, cu, &offset))
15078 SET_FIELD_BITPOS (*fp, offset * bits_per_byte);
15079 attr = dwarf2_attr (die, DW_AT_bit_offset, cu);
15082 if (gdbarch_bits_big_endian (gdbarch))
15084 /* For big endian bits, the DW_AT_bit_offset gives the
15085 additional bit offset from the MSB of the containing
15086 anonymous object to the MSB of the field. We don't
15087 have to do anything special since we don't need to
15088 know the size of the anonymous object. */
15089 SET_FIELD_BITPOS (*fp, FIELD_BITPOS (*fp) + DW_UNSND (attr));
15093 /* For little endian bits, compute the bit offset to the
15094 MSB of the anonymous object, subtract off the number of
15095 bits from the MSB of the field to the MSB of the
15096 object, and then subtract off the number of bits of
15097 the field itself. The result is the bit offset of
15098 the LSB of the field. */
15099 int anonymous_size;
15100 int bit_offset = DW_UNSND (attr);
15102 attr = dwarf2_attr (die, DW_AT_byte_size, cu);
15105 /* The size of the anonymous object containing
15106 the bit field is explicit, so use the
15107 indicated size (in bytes). */
15108 anonymous_size = DW_UNSND (attr);
15112 /* The size of the anonymous object containing
15113 the bit field must be inferred from the type
15114 attribute of the data member containing the
15116 anonymous_size = TYPE_LENGTH (fp->type);
15118 SET_FIELD_BITPOS (*fp,
15119 (FIELD_BITPOS (*fp)
15120 + anonymous_size * bits_per_byte
15121 - bit_offset - FIELD_BITSIZE (*fp)));
15124 attr = dwarf2_attr (die, DW_AT_data_bit_offset, cu);
15126 SET_FIELD_BITPOS (*fp, (FIELD_BITPOS (*fp)
15127 + dwarf2_get_attr_constant_value (attr, 0)));
15129 /* Get name of field. */
15130 fieldname = dwarf2_name (die, cu);
15131 if (fieldname == NULL)
15134 /* The name is already allocated along with this objfile, so we don't
15135 need to duplicate it for the type. */
15136 fp->name = fieldname;
15138 /* Change accessibility for artificial fields (e.g. virtual table
15139 pointer or virtual base class pointer) to private. */
15140 if (dwarf2_attr (die, DW_AT_artificial, cu))
15142 FIELD_ARTIFICIAL (*fp) = 1;
15143 new_field->accessibility = DW_ACCESS_private;
15144 fip->non_public_fields = 1;
15147 else if (die->tag == DW_TAG_member || die->tag == DW_TAG_variable)
15149 /* C++ static member. */
15151 /* NOTE: carlton/2002-11-05: It should be a DW_TAG_member that
15152 is a declaration, but all versions of G++ as of this writing
15153 (so through at least 3.2.1) incorrectly generate
15154 DW_TAG_variable tags. */
15156 const char *physname;
15158 /* Get name of field. */
15159 fieldname = dwarf2_name (die, cu);
15160 if (fieldname == NULL)
15163 attr = dwarf2_attr (die, DW_AT_const_value, cu);
15165 /* Only create a symbol if this is an external value.
15166 new_symbol checks this and puts the value in the global symbol
15167 table, which we want. If it is not external, new_symbol
15168 will try to put the value in cu->list_in_scope which is wrong. */
15169 && dwarf2_flag_true_p (die, DW_AT_external, cu))
15171 /* A static const member, not much different than an enum as far as
15172 we're concerned, except that we can support more types. */
15173 new_symbol (die, NULL, cu);
15176 /* Get physical name. */
15177 physname = dwarf2_physname (fieldname, die, cu);
15179 /* The name is already allocated along with this objfile, so we don't
15180 need to duplicate it for the type. */
15181 SET_FIELD_PHYSNAME (*fp, physname ? physname : "");
15182 FIELD_TYPE (*fp) = die_type (die, cu);
15183 FIELD_NAME (*fp) = fieldname;
15185 else if (die->tag == DW_TAG_inheritance)
15189 /* C++ base class field. */
15190 if (handle_data_member_location (die, cu, &offset))
15191 SET_FIELD_BITPOS (*fp, offset * bits_per_byte);
15192 FIELD_BITSIZE (*fp) = 0;
15193 FIELD_TYPE (*fp) = die_type (die, cu);
15194 FIELD_NAME (*fp) = TYPE_NAME (fp->type);
15196 else if (die->tag == DW_TAG_variant_part)
15198 /* process_structure_scope will treat this DIE as a union. */
15199 process_structure_scope (die, cu);
15201 /* The variant part is relative to the start of the enclosing
15203 SET_FIELD_BITPOS (*fp, 0);
15204 fp->type = get_die_type (die, cu);
15205 fp->artificial = 1;
15206 fp->name = "<<variant>>";
15208 /* Normally a DW_TAG_variant_part won't have a size, but our
15209 representation requires one, so set it to the maximum of the
15211 if (TYPE_LENGTH (fp->type) == 0)
15214 for (int i = 0; i < TYPE_NFIELDS (fp->type); ++i)
15215 if (TYPE_LENGTH (TYPE_FIELD_TYPE (fp->type, i)) > max)
15216 max = TYPE_LENGTH (TYPE_FIELD_TYPE (fp->type, i));
15217 TYPE_LENGTH (fp->type) = max;
15221 gdb_assert_not_reached ("missing case in dwarf2_add_field");
15224 /* Can the type given by DIE define another type? */
15227 type_can_define_types (const struct die_info *die)
15231 case DW_TAG_typedef:
15232 case DW_TAG_class_type:
15233 case DW_TAG_structure_type:
15234 case DW_TAG_union_type:
15235 case DW_TAG_enumeration_type:
15243 /* Add a type definition defined in the scope of the FIP's class. */
15246 dwarf2_add_type_defn (struct field_info *fip, struct die_info *die,
15247 struct dwarf2_cu *cu)
15249 struct decl_field fp;
15250 memset (&fp, 0, sizeof (fp));
15252 gdb_assert (type_can_define_types (die));
15254 /* Get name of field. NULL is okay here, meaning an anonymous type. */
15255 fp.name = dwarf2_name (die, cu);
15256 fp.type = read_type_die (die, cu);
15258 /* Save accessibility. */
15259 enum dwarf_access_attribute accessibility;
15260 struct attribute *attr = dwarf2_attr (die, DW_AT_accessibility, cu);
15262 accessibility = (enum dwarf_access_attribute) DW_UNSND (attr);
15264 accessibility = dwarf2_default_access_attribute (die, cu);
15265 switch (accessibility)
15267 case DW_ACCESS_public:
15268 /* The assumed value if neither private nor protected. */
15270 case DW_ACCESS_private:
15273 case DW_ACCESS_protected:
15274 fp.is_protected = 1;
15277 complaint (_("Unhandled DW_AT_accessibility value (%x)"), accessibility);
15280 if (die->tag == DW_TAG_typedef)
15281 fip->typedef_field_list.push_back (fp);
15283 fip->nested_types_list.push_back (fp);
15286 /* Create the vector of fields, and attach it to the type. */
15289 dwarf2_attach_fields_to_type (struct field_info *fip, struct type *type,
15290 struct dwarf2_cu *cu)
15292 int nfields = fip->nfields;
15294 /* Record the field count, allocate space for the array of fields,
15295 and create blank accessibility bitfields if necessary. */
15296 TYPE_NFIELDS (type) = nfields;
15297 TYPE_FIELDS (type) = (struct field *)
15298 TYPE_ZALLOC (type, sizeof (struct field) * nfields);
15300 if (fip->non_public_fields && cu->language != language_ada)
15302 ALLOCATE_CPLUS_STRUCT_TYPE (type);
15304 TYPE_FIELD_PRIVATE_BITS (type) =
15305 (B_TYPE *) TYPE_ALLOC (type, B_BYTES (nfields));
15306 B_CLRALL (TYPE_FIELD_PRIVATE_BITS (type), nfields);
15308 TYPE_FIELD_PROTECTED_BITS (type) =
15309 (B_TYPE *) TYPE_ALLOC (type, B_BYTES (nfields));
15310 B_CLRALL (TYPE_FIELD_PROTECTED_BITS (type), nfields);
15312 TYPE_FIELD_IGNORE_BITS (type) =
15313 (B_TYPE *) TYPE_ALLOC (type, B_BYTES (nfields));
15314 B_CLRALL (TYPE_FIELD_IGNORE_BITS (type), nfields);
15317 /* If the type has baseclasses, allocate and clear a bit vector for
15318 TYPE_FIELD_VIRTUAL_BITS. */
15319 if (!fip->baseclasses.empty () && cu->language != language_ada)
15321 int num_bytes = B_BYTES (fip->baseclasses.size ());
15322 unsigned char *pointer;
15324 ALLOCATE_CPLUS_STRUCT_TYPE (type);
15325 pointer = (unsigned char *) TYPE_ALLOC (type, num_bytes);
15326 TYPE_FIELD_VIRTUAL_BITS (type) = pointer;
15327 B_CLRALL (TYPE_FIELD_VIRTUAL_BITS (type), fip->baseclasses.size ());
15328 TYPE_N_BASECLASSES (type) = fip->baseclasses.size ();
15331 if (TYPE_FLAG_DISCRIMINATED_UNION (type))
15333 struct discriminant_info *di = alloc_discriminant_info (type, -1, -1);
15335 for (int index = 0; index < nfields; ++index)
15337 struct nextfield &field = fip->fields[index];
15339 if (field.variant.is_discriminant)
15340 di->discriminant_index = index;
15341 else if (field.variant.default_branch)
15342 di->default_index = index;
15344 di->discriminants[index] = field.variant.discriminant_value;
15348 /* Copy the saved-up fields into the field vector. */
15349 for (int i = 0; i < nfields; ++i)
15351 struct nextfield &field
15352 = ((i < fip->baseclasses.size ()) ? fip->baseclasses[i]
15353 : fip->fields[i - fip->baseclasses.size ()]);
15355 TYPE_FIELD (type, i) = field.field;
15356 switch (field.accessibility)
15358 case DW_ACCESS_private:
15359 if (cu->language != language_ada)
15360 SET_TYPE_FIELD_PRIVATE (type, i);
15363 case DW_ACCESS_protected:
15364 if (cu->language != language_ada)
15365 SET_TYPE_FIELD_PROTECTED (type, i);
15368 case DW_ACCESS_public:
15372 /* Unknown accessibility. Complain and treat it as public. */
15374 complaint (_("unsupported accessibility %d"),
15375 field.accessibility);
15379 if (i < fip->baseclasses.size ())
15381 switch (field.virtuality)
15383 case DW_VIRTUALITY_virtual:
15384 case DW_VIRTUALITY_pure_virtual:
15385 if (cu->language == language_ada)
15386 error (_("unexpected virtuality in component of Ada type"));
15387 SET_TYPE_FIELD_VIRTUAL (type, i);
15394 /* Return true if this member function is a constructor, false
15398 dwarf2_is_constructor (struct die_info *die, struct dwarf2_cu *cu)
15400 const char *fieldname;
15401 const char *type_name;
15404 if (die->parent == NULL)
15407 if (die->parent->tag != DW_TAG_structure_type
15408 && die->parent->tag != DW_TAG_union_type
15409 && die->parent->tag != DW_TAG_class_type)
15412 fieldname = dwarf2_name (die, cu);
15413 type_name = dwarf2_name (die->parent, cu);
15414 if (fieldname == NULL || type_name == NULL)
15417 len = strlen (fieldname);
15418 return (strncmp (fieldname, type_name, len) == 0
15419 && (type_name[len] == '\0' || type_name[len] == '<'));
15422 /* Add a member function to the proper fieldlist. */
15425 dwarf2_add_member_fn (struct field_info *fip, struct die_info *die,
15426 struct type *type, struct dwarf2_cu *cu)
15428 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
15429 struct attribute *attr;
15431 struct fnfieldlist *flp = nullptr;
15432 struct fn_field *fnp;
15433 const char *fieldname;
15434 struct type *this_type;
15435 enum dwarf_access_attribute accessibility;
15437 if (cu->language == language_ada)
15438 error (_("unexpected member function in Ada type"));
15440 /* Get name of member function. */
15441 fieldname = dwarf2_name (die, cu);
15442 if (fieldname == NULL)
15445 /* Look up member function name in fieldlist. */
15446 for (i = 0; i < fip->fnfieldlists.size (); i++)
15448 if (strcmp (fip->fnfieldlists[i].name, fieldname) == 0)
15450 flp = &fip->fnfieldlists[i];
15455 /* Create a new fnfieldlist if necessary. */
15456 if (flp == nullptr)
15458 fip->fnfieldlists.emplace_back ();
15459 flp = &fip->fnfieldlists.back ();
15460 flp->name = fieldname;
15461 i = fip->fnfieldlists.size () - 1;
15464 /* Create a new member function field and add it to the vector of
15466 flp->fnfields.emplace_back ();
15467 fnp = &flp->fnfields.back ();
15469 /* Delay processing of the physname until later. */
15470 if (cu->language == language_cplus)
15471 add_to_method_list (type, i, flp->fnfields.size () - 1, fieldname,
15475 const char *physname = dwarf2_physname (fieldname, die, cu);
15476 fnp->physname = physname ? physname : "";
15479 fnp->type = alloc_type (objfile);
15480 this_type = read_type_die (die, cu);
15481 if (this_type && TYPE_CODE (this_type) == TYPE_CODE_FUNC)
15483 int nparams = TYPE_NFIELDS (this_type);
15485 /* TYPE is the domain of this method, and THIS_TYPE is the type
15486 of the method itself (TYPE_CODE_METHOD). */
15487 smash_to_method_type (fnp->type, type,
15488 TYPE_TARGET_TYPE (this_type),
15489 TYPE_FIELDS (this_type),
15490 TYPE_NFIELDS (this_type),
15491 TYPE_VARARGS (this_type));
15493 /* Handle static member functions.
15494 Dwarf2 has no clean way to discern C++ static and non-static
15495 member functions. G++ helps GDB by marking the first
15496 parameter for non-static member functions (which is the this
15497 pointer) as artificial. We obtain this information from
15498 read_subroutine_type via TYPE_FIELD_ARTIFICIAL. */
15499 if (nparams == 0 || TYPE_FIELD_ARTIFICIAL (this_type, 0) == 0)
15500 fnp->voffset = VOFFSET_STATIC;
15503 complaint (_("member function type missing for '%s'"),
15504 dwarf2_full_name (fieldname, die, cu));
15506 /* Get fcontext from DW_AT_containing_type if present. */
15507 if (dwarf2_attr (die, DW_AT_containing_type, cu) != NULL)
15508 fnp->fcontext = die_containing_type (die, cu);
15510 /* dwarf2 doesn't have stubbed physical names, so the setting of is_const and
15511 is_volatile is irrelevant, as it is needed by gdb_mangle_name only. */
15513 /* Get accessibility. */
15514 attr = dwarf2_attr (die, DW_AT_accessibility, cu);
15516 accessibility = (enum dwarf_access_attribute) DW_UNSND (attr);
15518 accessibility = dwarf2_default_access_attribute (die, cu);
15519 switch (accessibility)
15521 case DW_ACCESS_private:
15522 fnp->is_private = 1;
15524 case DW_ACCESS_protected:
15525 fnp->is_protected = 1;
15529 /* Check for artificial methods. */
15530 attr = dwarf2_attr (die, DW_AT_artificial, cu);
15531 if (attr && DW_UNSND (attr) != 0)
15532 fnp->is_artificial = 1;
15534 fnp->is_constructor = dwarf2_is_constructor (die, cu);
15536 /* Get index in virtual function table if it is a virtual member
15537 function. For older versions of GCC, this is an offset in the
15538 appropriate virtual table, as specified by DW_AT_containing_type.
15539 For everyone else, it is an expression to be evaluated relative
15540 to the object address. */
15542 attr = dwarf2_attr (die, DW_AT_vtable_elem_location, cu);
15545 if (attr_form_is_block (attr) && DW_BLOCK (attr)->size > 0)
15547 if (DW_BLOCK (attr)->data[0] == DW_OP_constu)
15549 /* Old-style GCC. */
15550 fnp->voffset = decode_locdesc (DW_BLOCK (attr), cu) + 2;
15552 else if (DW_BLOCK (attr)->data[0] == DW_OP_deref
15553 || (DW_BLOCK (attr)->size > 1
15554 && DW_BLOCK (attr)->data[0] == DW_OP_deref_size
15555 && DW_BLOCK (attr)->data[1] == cu->header.addr_size))
15557 fnp->voffset = decode_locdesc (DW_BLOCK (attr), cu);
15558 if ((fnp->voffset % cu->header.addr_size) != 0)
15559 dwarf2_complex_location_expr_complaint ();
15561 fnp->voffset /= cu->header.addr_size;
15565 dwarf2_complex_location_expr_complaint ();
15567 if (!fnp->fcontext)
15569 /* If there is no `this' field and no DW_AT_containing_type,
15570 we cannot actually find a base class context for the
15572 if (TYPE_NFIELDS (this_type) == 0
15573 || !TYPE_FIELD_ARTIFICIAL (this_type, 0))
15575 complaint (_("cannot determine context for virtual member "
15576 "function \"%s\" (offset %s)"),
15577 fieldname, sect_offset_str (die->sect_off));
15582 = TYPE_TARGET_TYPE (TYPE_FIELD_TYPE (this_type, 0));
15586 else if (attr_form_is_section_offset (attr))
15588 dwarf2_complex_location_expr_complaint ();
15592 dwarf2_invalid_attrib_class_complaint ("DW_AT_vtable_elem_location",
15598 attr = dwarf2_attr (die, DW_AT_virtuality, cu);
15599 if (attr && DW_UNSND (attr))
15601 /* GCC does this, as of 2008-08-25; PR debug/37237. */
15602 complaint (_("Member function \"%s\" (offset %s) is virtual "
15603 "but the vtable offset is not specified"),
15604 fieldname, sect_offset_str (die->sect_off));
15605 ALLOCATE_CPLUS_STRUCT_TYPE (type);
15606 TYPE_CPLUS_DYNAMIC (type) = 1;
15611 /* Create the vector of member function fields, and attach it to the type. */
15614 dwarf2_attach_fn_fields_to_type (struct field_info *fip, struct type *type,
15615 struct dwarf2_cu *cu)
15617 if (cu->language == language_ada)
15618 error (_("unexpected member functions in Ada type"));
15620 ALLOCATE_CPLUS_STRUCT_TYPE (type);
15621 TYPE_FN_FIELDLISTS (type) = (struct fn_fieldlist *)
15623 sizeof (struct fn_fieldlist) * fip->fnfieldlists.size ());
15625 for (int i = 0; i < fip->fnfieldlists.size (); i++)
15627 struct fnfieldlist &nf = fip->fnfieldlists[i];
15628 struct fn_fieldlist *fn_flp = &TYPE_FN_FIELDLIST (type, i);
15630 TYPE_FN_FIELDLIST_NAME (type, i) = nf.name;
15631 TYPE_FN_FIELDLIST_LENGTH (type, i) = nf.fnfields.size ();
15632 fn_flp->fn_fields = (struct fn_field *)
15633 TYPE_ALLOC (type, sizeof (struct fn_field) * nf.fnfields.size ());
15635 for (int k = 0; k < nf.fnfields.size (); ++k)
15636 fn_flp->fn_fields[k] = nf.fnfields[k];
15639 TYPE_NFN_FIELDS (type) = fip->fnfieldlists.size ();
15642 /* Returns non-zero if NAME is the name of a vtable member in CU's
15643 language, zero otherwise. */
15645 is_vtable_name (const char *name, struct dwarf2_cu *cu)
15647 static const char vptr[] = "_vptr";
15649 /* Look for the C++ form of the vtable. */
15650 if (startswith (name, vptr) && is_cplus_marker (name[sizeof (vptr) - 1]))
15656 /* GCC outputs unnamed structures that are really pointers to member
15657 functions, with the ABI-specified layout. If TYPE describes
15658 such a structure, smash it into a member function type.
15660 GCC shouldn't do this; it should just output pointer to member DIEs.
15661 This is GCC PR debug/28767. */
15664 quirk_gcc_member_function_pointer (struct type *type, struct objfile *objfile)
15666 struct type *pfn_type, *self_type, *new_type;
15668 /* Check for a structure with no name and two children. */
15669 if (TYPE_CODE (type) != TYPE_CODE_STRUCT || TYPE_NFIELDS (type) != 2)
15672 /* Check for __pfn and __delta members. */
15673 if (TYPE_FIELD_NAME (type, 0) == NULL
15674 || strcmp (TYPE_FIELD_NAME (type, 0), "__pfn") != 0
15675 || TYPE_FIELD_NAME (type, 1) == NULL
15676 || strcmp (TYPE_FIELD_NAME (type, 1), "__delta") != 0)
15679 /* Find the type of the method. */
15680 pfn_type = TYPE_FIELD_TYPE (type, 0);
15681 if (pfn_type == NULL
15682 || TYPE_CODE (pfn_type) != TYPE_CODE_PTR
15683 || TYPE_CODE (TYPE_TARGET_TYPE (pfn_type)) != TYPE_CODE_FUNC)
15686 /* Look for the "this" argument. */
15687 pfn_type = TYPE_TARGET_TYPE (pfn_type);
15688 if (TYPE_NFIELDS (pfn_type) == 0
15689 /* || TYPE_FIELD_TYPE (pfn_type, 0) == NULL */
15690 || TYPE_CODE (TYPE_FIELD_TYPE (pfn_type, 0)) != TYPE_CODE_PTR)
15693 self_type = TYPE_TARGET_TYPE (TYPE_FIELD_TYPE (pfn_type, 0));
15694 new_type = alloc_type (objfile);
15695 smash_to_method_type (new_type, self_type, TYPE_TARGET_TYPE (pfn_type),
15696 TYPE_FIELDS (pfn_type), TYPE_NFIELDS (pfn_type),
15697 TYPE_VARARGS (pfn_type));
15698 smash_to_methodptr_type (type, new_type);
15701 /* If the DIE has a DW_AT_alignment attribute, return its value, doing
15702 appropriate error checking and issuing complaints if there is a
15706 get_alignment (struct dwarf2_cu *cu, struct die_info *die)
15708 struct attribute *attr = dwarf2_attr (die, DW_AT_alignment, cu);
15710 if (attr == nullptr)
15713 if (!attr_form_is_constant (attr))
15715 complaint (_("DW_AT_alignment must have constant form"
15716 " - DIE at %s [in module %s]"),
15717 sect_offset_str (die->sect_off),
15718 objfile_name (cu->per_cu->dwarf2_per_objfile->objfile));
15723 if (attr->form == DW_FORM_sdata)
15725 LONGEST val = DW_SND (attr);
15728 complaint (_("DW_AT_alignment value must not be negative"
15729 " - DIE at %s [in module %s]"),
15730 sect_offset_str (die->sect_off),
15731 objfile_name (cu->per_cu->dwarf2_per_objfile->objfile));
15737 align = DW_UNSND (attr);
15741 complaint (_("DW_AT_alignment value must not be zero"
15742 " - DIE at %s [in module %s]"),
15743 sect_offset_str (die->sect_off),
15744 objfile_name (cu->per_cu->dwarf2_per_objfile->objfile));
15747 if ((align & (align - 1)) != 0)
15749 complaint (_("DW_AT_alignment value must be a power of 2"
15750 " - DIE at %s [in module %s]"),
15751 sect_offset_str (die->sect_off),
15752 objfile_name (cu->per_cu->dwarf2_per_objfile->objfile));
15759 /* If the DIE has a DW_AT_alignment attribute, use its value to set
15760 the alignment for TYPE. */
15763 maybe_set_alignment (struct dwarf2_cu *cu, struct die_info *die,
15766 if (!set_type_align (type, get_alignment (cu, die)))
15767 complaint (_("DW_AT_alignment value too large"
15768 " - DIE at %s [in module %s]"),
15769 sect_offset_str (die->sect_off),
15770 objfile_name (cu->per_cu->dwarf2_per_objfile->objfile));
15773 /* Called when we find the DIE that starts a structure or union scope
15774 (definition) to create a type for the structure or union. Fill in
15775 the type's name and general properties; the members will not be
15776 processed until process_structure_scope. A symbol table entry for
15777 the type will also not be done until process_structure_scope (assuming
15778 the type has a name).
15780 NOTE: we need to call these functions regardless of whether or not the
15781 DIE has a DW_AT_name attribute, since it might be an anonymous
15782 structure or union. This gets the type entered into our set of
15783 user defined types. */
15785 static struct type *
15786 read_structure_type (struct die_info *die, struct dwarf2_cu *cu)
15788 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
15790 struct attribute *attr;
15793 /* If the definition of this type lives in .debug_types, read that type.
15794 Don't follow DW_AT_specification though, that will take us back up
15795 the chain and we want to go down. */
15796 attr = dwarf2_attr_no_follow (die, DW_AT_signature);
15799 type = get_DW_AT_signature_type (die, attr, cu);
15801 /* The type's CU may not be the same as CU.
15802 Ensure TYPE is recorded with CU in die_type_hash. */
15803 return set_die_type (die, type, cu);
15806 type = alloc_type (objfile);
15807 INIT_CPLUS_SPECIFIC (type);
15809 name = dwarf2_name (die, cu);
15812 if (cu->language == language_cplus
15813 || cu->language == language_d
15814 || cu->language == language_rust)
15816 const char *full_name = dwarf2_full_name (name, die, cu);
15818 /* dwarf2_full_name might have already finished building the DIE's
15819 type. If so, there is no need to continue. */
15820 if (get_die_type (die, cu) != NULL)
15821 return get_die_type (die, cu);
15823 TYPE_NAME (type) = full_name;
15827 /* The name is already allocated along with this objfile, so
15828 we don't need to duplicate it for the type. */
15829 TYPE_NAME (type) = name;
15833 if (die->tag == DW_TAG_structure_type)
15835 TYPE_CODE (type) = TYPE_CODE_STRUCT;
15837 else if (die->tag == DW_TAG_union_type)
15839 TYPE_CODE (type) = TYPE_CODE_UNION;
15841 else if (die->tag == DW_TAG_variant_part)
15843 TYPE_CODE (type) = TYPE_CODE_UNION;
15844 TYPE_FLAG_DISCRIMINATED_UNION (type) = 1;
15848 TYPE_CODE (type) = TYPE_CODE_STRUCT;
15851 if (cu->language == language_cplus && die->tag == DW_TAG_class_type)
15852 TYPE_DECLARED_CLASS (type) = 1;
15854 attr = dwarf2_attr (die, DW_AT_byte_size, cu);
15857 if (attr_form_is_constant (attr))
15858 TYPE_LENGTH (type) = DW_UNSND (attr);
15861 /* For the moment, dynamic type sizes are not supported
15862 by GDB's struct type. The actual size is determined
15863 on-demand when resolving the type of a given object,
15864 so set the type's length to zero for now. Otherwise,
15865 we record an expression as the length, and that expression
15866 could lead to a very large value, which could eventually
15867 lead to us trying to allocate that much memory when creating
15868 a value of that type. */
15869 TYPE_LENGTH (type) = 0;
15874 TYPE_LENGTH (type) = 0;
15877 maybe_set_alignment (cu, die, type);
15879 if (producer_is_icc_lt_14 (cu) && (TYPE_LENGTH (type) == 0))
15881 /* ICC<14 does not output the required DW_AT_declaration on
15882 incomplete types, but gives them a size of zero. */
15883 TYPE_STUB (type) = 1;
15886 TYPE_STUB_SUPPORTED (type) = 1;
15888 if (die_is_declaration (die, cu))
15889 TYPE_STUB (type) = 1;
15890 else if (attr == NULL && die->child == NULL
15891 && producer_is_realview (cu->producer))
15892 /* RealView does not output the required DW_AT_declaration
15893 on incomplete types. */
15894 TYPE_STUB (type) = 1;
15896 /* We need to add the type field to the die immediately so we don't
15897 infinitely recurse when dealing with pointers to the structure
15898 type within the structure itself. */
15899 set_die_type (die, type, cu);
15901 /* set_die_type should be already done. */
15902 set_descriptive_type (type, die, cu);
15907 /* A helper for process_structure_scope that handles a single member
15911 handle_struct_member_die (struct die_info *child_die, struct type *type,
15912 struct field_info *fi,
15913 std::vector<struct symbol *> *template_args,
15914 struct dwarf2_cu *cu)
15916 if (child_die->tag == DW_TAG_member
15917 || child_die->tag == DW_TAG_variable
15918 || child_die->tag == DW_TAG_variant_part)
15920 /* NOTE: carlton/2002-11-05: A C++ static data member
15921 should be a DW_TAG_member that is a declaration, but
15922 all versions of G++ as of this writing (so through at
15923 least 3.2.1) incorrectly generate DW_TAG_variable
15924 tags for them instead. */
15925 dwarf2_add_field (fi, child_die, cu);
15927 else if (child_die->tag == DW_TAG_subprogram)
15929 /* Rust doesn't have member functions in the C++ sense.
15930 However, it does emit ordinary functions as children
15931 of a struct DIE. */
15932 if (cu->language == language_rust)
15933 read_func_scope (child_die, cu);
15936 /* C++ member function. */
15937 dwarf2_add_member_fn (fi, child_die, type, cu);
15940 else if (child_die->tag == DW_TAG_inheritance)
15942 /* C++ base class field. */
15943 dwarf2_add_field (fi, child_die, cu);
15945 else if (type_can_define_types (child_die))
15946 dwarf2_add_type_defn (fi, child_die, cu);
15947 else if (child_die->tag == DW_TAG_template_type_param
15948 || child_die->tag == DW_TAG_template_value_param)
15950 struct symbol *arg = new_symbol (child_die, NULL, cu);
15953 template_args->push_back (arg);
15955 else if (child_die->tag == DW_TAG_variant)
15957 /* In a variant we want to get the discriminant and also add a
15958 field for our sole member child. */
15959 struct attribute *discr = dwarf2_attr (child_die, DW_AT_discr_value, cu);
15961 for (struct die_info *variant_child = child_die->child;
15962 variant_child != NULL;
15963 variant_child = sibling_die (variant_child))
15965 if (variant_child->tag == DW_TAG_member)
15967 handle_struct_member_die (variant_child, type, fi,
15968 template_args, cu);
15969 /* Only handle the one. */
15974 /* We don't handle this but we might as well report it if we see
15976 if (dwarf2_attr (child_die, DW_AT_discr_list, cu) != nullptr)
15977 complaint (_("DW_AT_discr_list is not supported yet"
15978 " - DIE at %s [in module %s]"),
15979 sect_offset_str (child_die->sect_off),
15980 objfile_name (cu->per_cu->dwarf2_per_objfile->objfile));
15982 /* The first field was just added, so we can stash the
15983 discriminant there. */
15984 gdb_assert (!fi->fields.empty ());
15986 fi->fields.back ().variant.default_branch = true;
15988 fi->fields.back ().variant.discriminant_value = DW_UNSND (discr);
15992 /* Finish creating a structure or union type, including filling in
15993 its members and creating a symbol for it. */
15996 process_structure_scope (struct die_info *die, struct dwarf2_cu *cu)
15998 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
15999 struct die_info *child_die;
16002 type = get_die_type (die, cu);
16004 type = read_structure_type (die, cu);
16006 /* When reading a DW_TAG_variant_part, we need to notice when we
16007 read the discriminant member, so we can record it later in the
16008 discriminant_info. */
16009 bool is_variant_part = TYPE_FLAG_DISCRIMINATED_UNION (type);
16010 sect_offset discr_offset;
16011 bool has_template_parameters = false;
16013 if (is_variant_part)
16015 struct attribute *discr = dwarf2_attr (die, DW_AT_discr, cu);
16018 /* Maybe it's a univariant form, an extension we support.
16019 In this case arrange not to check the offset. */
16020 is_variant_part = false;
16022 else if (attr_form_is_ref (discr))
16024 struct dwarf2_cu *target_cu = cu;
16025 struct die_info *target_die = follow_die_ref (die, discr, &target_cu);
16027 discr_offset = target_die->sect_off;
16031 complaint (_("DW_AT_discr does not have DIE reference form"
16032 " - DIE at %s [in module %s]"),
16033 sect_offset_str (die->sect_off),
16034 objfile_name (cu->per_cu->dwarf2_per_objfile->objfile));
16035 is_variant_part = false;
16039 if (die->child != NULL && ! die_is_declaration (die, cu))
16041 struct field_info fi;
16042 std::vector<struct symbol *> template_args;
16044 child_die = die->child;
16046 while (child_die && child_die->tag)
16048 handle_struct_member_die (child_die, type, &fi, &template_args, cu);
16050 if (is_variant_part && discr_offset == child_die->sect_off)
16051 fi.fields.back ().variant.is_discriminant = true;
16053 child_die = sibling_die (child_die);
16056 /* Attach template arguments to type. */
16057 if (!template_args.empty ())
16059 has_template_parameters = true;
16060 ALLOCATE_CPLUS_STRUCT_TYPE (type);
16061 TYPE_N_TEMPLATE_ARGUMENTS (type) = template_args.size ();
16062 TYPE_TEMPLATE_ARGUMENTS (type)
16063 = XOBNEWVEC (&objfile->objfile_obstack,
16065 TYPE_N_TEMPLATE_ARGUMENTS (type));
16066 memcpy (TYPE_TEMPLATE_ARGUMENTS (type),
16067 template_args.data (),
16068 (TYPE_N_TEMPLATE_ARGUMENTS (type)
16069 * sizeof (struct symbol *)));
16072 /* Attach fields and member functions to the type. */
16074 dwarf2_attach_fields_to_type (&fi, type, cu);
16075 if (!fi.fnfieldlists.empty ())
16077 dwarf2_attach_fn_fields_to_type (&fi, type, cu);
16079 /* Get the type which refers to the base class (possibly this
16080 class itself) which contains the vtable pointer for the current
16081 class from the DW_AT_containing_type attribute. This use of
16082 DW_AT_containing_type is a GNU extension. */
16084 if (dwarf2_attr (die, DW_AT_containing_type, cu) != NULL)
16086 struct type *t = die_containing_type (die, cu);
16088 set_type_vptr_basetype (type, t);
16093 /* Our own class provides vtbl ptr. */
16094 for (i = TYPE_NFIELDS (t) - 1;
16095 i >= TYPE_N_BASECLASSES (t);
16098 const char *fieldname = TYPE_FIELD_NAME (t, i);
16100 if (is_vtable_name (fieldname, cu))
16102 set_type_vptr_fieldno (type, i);
16107 /* Complain if virtual function table field not found. */
16108 if (i < TYPE_N_BASECLASSES (t))
16109 complaint (_("virtual function table pointer "
16110 "not found when defining class '%s'"),
16111 TYPE_NAME (type) ? TYPE_NAME (type) : "");
16115 set_type_vptr_fieldno (type, TYPE_VPTR_FIELDNO (t));
16118 else if (cu->producer
16119 && startswith (cu->producer, "IBM(R) XL C/C++ Advanced Edition"))
16121 /* The IBM XLC compiler does not provide direct indication
16122 of the containing type, but the vtable pointer is
16123 always named __vfp. */
16127 for (i = TYPE_NFIELDS (type) - 1;
16128 i >= TYPE_N_BASECLASSES (type);
16131 if (strcmp (TYPE_FIELD_NAME (type, i), "__vfp") == 0)
16133 set_type_vptr_fieldno (type, i);
16134 set_type_vptr_basetype (type, type);
16141 /* Copy fi.typedef_field_list linked list elements content into the
16142 allocated array TYPE_TYPEDEF_FIELD_ARRAY (type). */
16143 if (!fi.typedef_field_list.empty ())
16145 int count = fi.typedef_field_list.size ();
16147 ALLOCATE_CPLUS_STRUCT_TYPE (type);
16148 TYPE_TYPEDEF_FIELD_ARRAY (type)
16149 = ((struct decl_field *)
16151 sizeof (TYPE_TYPEDEF_FIELD (type, 0)) * count));
16152 TYPE_TYPEDEF_FIELD_COUNT (type) = count;
16154 for (int i = 0; i < fi.typedef_field_list.size (); ++i)
16155 TYPE_TYPEDEF_FIELD (type, i) = fi.typedef_field_list[i];
16158 /* Copy fi.nested_types_list linked list elements content into the
16159 allocated array TYPE_NESTED_TYPES_ARRAY (type). */
16160 if (!fi.nested_types_list.empty () && cu->language != language_ada)
16162 int count = fi.nested_types_list.size ();
16164 ALLOCATE_CPLUS_STRUCT_TYPE (type);
16165 TYPE_NESTED_TYPES_ARRAY (type)
16166 = ((struct decl_field *)
16167 TYPE_ALLOC (type, sizeof (struct decl_field) * count));
16168 TYPE_NESTED_TYPES_COUNT (type) = count;
16170 for (int i = 0; i < fi.nested_types_list.size (); ++i)
16171 TYPE_NESTED_TYPES_FIELD (type, i) = fi.nested_types_list[i];
16175 quirk_gcc_member_function_pointer (type, objfile);
16176 if (cu->language == language_rust && die->tag == DW_TAG_union_type)
16177 cu->rust_unions.push_back (type);
16179 /* NOTE: carlton/2004-03-16: GCC 3.4 (or at least one of its
16180 snapshots) has been known to create a die giving a declaration
16181 for a class that has, as a child, a die giving a definition for a
16182 nested class. So we have to process our children even if the
16183 current die is a declaration. Normally, of course, a declaration
16184 won't have any children at all. */
16186 child_die = die->child;
16188 while (child_die != NULL && child_die->tag)
16190 if (child_die->tag == DW_TAG_member
16191 || child_die->tag == DW_TAG_variable
16192 || child_die->tag == DW_TAG_inheritance
16193 || child_die->tag == DW_TAG_template_value_param
16194 || child_die->tag == DW_TAG_template_type_param)
16199 process_die (child_die, cu);
16201 child_die = sibling_die (child_die);
16204 /* Do not consider external references. According to the DWARF standard,
16205 these DIEs are identified by the fact that they have no byte_size
16206 attribute, and a declaration attribute. */
16207 if (dwarf2_attr (die, DW_AT_byte_size, cu) != NULL
16208 || !die_is_declaration (die, cu))
16210 struct symbol *sym = new_symbol (die, type, cu);
16212 if (has_template_parameters)
16214 /* Make sure that the symtab is set on the new symbols.
16215 Even though they don't appear in this symtab directly,
16216 other parts of gdb assume that symbols do, and this is
16217 reasonably true. */
16218 for (int i = 0; i < TYPE_N_TEMPLATE_ARGUMENTS (type); ++i)
16219 symbol_set_symtab (TYPE_TEMPLATE_ARGUMENT (type, i),
16220 symbol_symtab (sym));
16225 /* Assuming DIE is an enumeration type, and TYPE is its associated type,
16226 update TYPE using some information only available in DIE's children. */
16229 update_enumeration_type_from_children (struct die_info *die,
16231 struct dwarf2_cu *cu)
16233 struct die_info *child_die;
16234 int unsigned_enum = 1;
16238 auto_obstack obstack;
16240 for (child_die = die->child;
16241 child_die != NULL && child_die->tag;
16242 child_die = sibling_die (child_die))
16244 struct attribute *attr;
16246 const gdb_byte *bytes;
16247 struct dwarf2_locexpr_baton *baton;
16250 if (child_die->tag != DW_TAG_enumerator)
16253 attr = dwarf2_attr (child_die, DW_AT_const_value, cu);
16257 name = dwarf2_name (child_die, cu);
16259 name = "<anonymous enumerator>";
16261 dwarf2_const_value_attr (attr, type, name, &obstack, cu,
16262 &value, &bytes, &baton);
16268 else if ((mask & value) != 0)
16273 /* If we already know that the enum type is neither unsigned, nor
16274 a flag type, no need to look at the rest of the enumerates. */
16275 if (!unsigned_enum && !flag_enum)
16280 TYPE_UNSIGNED (type) = 1;
16282 TYPE_FLAG_ENUM (type) = 1;
16285 /* Given a DW_AT_enumeration_type die, set its type. We do not
16286 complete the type's fields yet, or create any symbols. */
16288 static struct type *
16289 read_enumeration_type (struct die_info *die, struct dwarf2_cu *cu)
16291 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
16293 struct attribute *attr;
16296 /* If the definition of this type lives in .debug_types, read that type.
16297 Don't follow DW_AT_specification though, that will take us back up
16298 the chain and we want to go down. */
16299 attr = dwarf2_attr_no_follow (die, DW_AT_signature);
16302 type = get_DW_AT_signature_type (die, attr, cu);
16304 /* The type's CU may not be the same as CU.
16305 Ensure TYPE is recorded with CU in die_type_hash. */
16306 return set_die_type (die, type, cu);
16309 type = alloc_type (objfile);
16311 TYPE_CODE (type) = TYPE_CODE_ENUM;
16312 name = dwarf2_full_name (NULL, die, cu);
16314 TYPE_NAME (type) = name;
16316 attr = dwarf2_attr (die, DW_AT_type, cu);
16319 struct type *underlying_type = die_type (die, cu);
16321 TYPE_TARGET_TYPE (type) = underlying_type;
16324 attr = dwarf2_attr (die, DW_AT_byte_size, cu);
16327 TYPE_LENGTH (type) = DW_UNSND (attr);
16331 TYPE_LENGTH (type) = 0;
16334 maybe_set_alignment (cu, die, type);
16336 /* The enumeration DIE can be incomplete. In Ada, any type can be
16337 declared as private in the package spec, and then defined only
16338 inside the package body. Such types are known as Taft Amendment
16339 Types. When another package uses such a type, an incomplete DIE
16340 may be generated by the compiler. */
16341 if (die_is_declaration (die, cu))
16342 TYPE_STUB (type) = 1;
16344 /* Finish the creation of this type by using the enum's children.
16345 We must call this even when the underlying type has been provided
16346 so that we can determine if we're looking at a "flag" enum. */
16347 update_enumeration_type_from_children (die, type, cu);
16349 /* If this type has an underlying type that is not a stub, then we
16350 may use its attributes. We always use the "unsigned" attribute
16351 in this situation, because ordinarily we guess whether the type
16352 is unsigned -- but the guess can be wrong and the underlying type
16353 can tell us the reality. However, we defer to a local size
16354 attribute if one exists, because this lets the compiler override
16355 the underlying type if needed. */
16356 if (TYPE_TARGET_TYPE (type) != NULL && !TYPE_STUB (TYPE_TARGET_TYPE (type)))
16358 TYPE_UNSIGNED (type) = TYPE_UNSIGNED (TYPE_TARGET_TYPE (type));
16359 if (TYPE_LENGTH (type) == 0)
16360 TYPE_LENGTH (type) = TYPE_LENGTH (TYPE_TARGET_TYPE (type));
16361 if (TYPE_RAW_ALIGN (type) == 0
16362 && TYPE_RAW_ALIGN (TYPE_TARGET_TYPE (type)) != 0)
16363 set_type_align (type, TYPE_RAW_ALIGN (TYPE_TARGET_TYPE (type)));
16366 TYPE_DECLARED_CLASS (type) = dwarf2_flag_true_p (die, DW_AT_enum_class, cu);
16368 return set_die_type (die, type, cu);
16371 /* Given a pointer to a die which begins an enumeration, process all
16372 the dies that define the members of the enumeration, and create the
16373 symbol for the enumeration type.
16375 NOTE: We reverse the order of the element list. */
16378 process_enumeration_scope (struct die_info *die, struct dwarf2_cu *cu)
16380 struct type *this_type;
16382 this_type = get_die_type (die, cu);
16383 if (this_type == NULL)
16384 this_type = read_enumeration_type (die, cu);
16386 if (die->child != NULL)
16388 struct die_info *child_die;
16389 struct symbol *sym;
16390 struct field *fields = NULL;
16391 int num_fields = 0;
16394 child_die = die->child;
16395 while (child_die && child_die->tag)
16397 if (child_die->tag != DW_TAG_enumerator)
16399 process_die (child_die, cu);
16403 name = dwarf2_name (child_die, cu);
16406 sym = new_symbol (child_die, this_type, cu);
16408 if ((num_fields % DW_FIELD_ALLOC_CHUNK) == 0)
16410 fields = (struct field *)
16412 (num_fields + DW_FIELD_ALLOC_CHUNK)
16413 * sizeof (struct field));
16416 FIELD_NAME (fields[num_fields]) = SYMBOL_LINKAGE_NAME (sym);
16417 FIELD_TYPE (fields[num_fields]) = NULL;
16418 SET_FIELD_ENUMVAL (fields[num_fields], SYMBOL_VALUE (sym));
16419 FIELD_BITSIZE (fields[num_fields]) = 0;
16425 child_die = sibling_die (child_die);
16430 TYPE_NFIELDS (this_type) = num_fields;
16431 TYPE_FIELDS (this_type) = (struct field *)
16432 TYPE_ALLOC (this_type, sizeof (struct field) * num_fields);
16433 memcpy (TYPE_FIELDS (this_type), fields,
16434 sizeof (struct field) * num_fields);
16439 /* If we are reading an enum from a .debug_types unit, and the enum
16440 is a declaration, and the enum is not the signatured type in the
16441 unit, then we do not want to add a symbol for it. Adding a
16442 symbol would in some cases obscure the true definition of the
16443 enum, giving users an incomplete type when the definition is
16444 actually available. Note that we do not want to do this for all
16445 enums which are just declarations, because C++0x allows forward
16446 enum declarations. */
16447 if (cu->per_cu->is_debug_types
16448 && die_is_declaration (die, cu))
16450 struct signatured_type *sig_type;
16452 sig_type = (struct signatured_type *) cu->per_cu;
16453 gdb_assert (to_underlying (sig_type->type_offset_in_section) != 0);
16454 if (sig_type->type_offset_in_section != die->sect_off)
16458 new_symbol (die, this_type, cu);
16461 /* Extract all information from a DW_TAG_array_type DIE and put it in
16462 the DIE's type field. For now, this only handles one dimensional
16465 static struct type *
16466 read_array_type (struct die_info *die, struct dwarf2_cu *cu)
16468 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
16469 struct die_info *child_die;
16471 struct type *element_type, *range_type, *index_type;
16472 struct attribute *attr;
16474 struct dynamic_prop *byte_stride_prop = NULL;
16475 unsigned int bit_stride = 0;
16477 element_type = die_type (die, cu);
16479 /* The die_type call above may have already set the type for this DIE. */
16480 type = get_die_type (die, cu);
16484 attr = dwarf2_attr (die, DW_AT_byte_stride, cu);
16490 = (struct dynamic_prop *) alloca (sizeof (struct dynamic_prop));
16491 stride_ok = attr_to_dynamic_prop (attr, die, cu, byte_stride_prop);
16494 complaint (_("unable to read array DW_AT_byte_stride "
16495 " - DIE at %s [in module %s]"),
16496 sect_offset_str (die->sect_off),
16497 objfile_name (cu->per_cu->dwarf2_per_objfile->objfile));
16498 /* Ignore this attribute. We will likely not be able to print
16499 arrays of this type correctly, but there is little we can do
16500 to help if we cannot read the attribute's value. */
16501 byte_stride_prop = NULL;
16505 attr = dwarf2_attr (die, DW_AT_bit_stride, cu);
16507 bit_stride = DW_UNSND (attr);
16509 /* Irix 6.2 native cc creates array types without children for
16510 arrays with unspecified length. */
16511 if (die->child == NULL)
16513 index_type = objfile_type (objfile)->builtin_int;
16514 range_type = create_static_range_type (NULL, index_type, 0, -1);
16515 type = create_array_type_with_stride (NULL, element_type, range_type,
16516 byte_stride_prop, bit_stride);
16517 return set_die_type (die, type, cu);
16520 std::vector<struct type *> range_types;
16521 child_die = die->child;
16522 while (child_die && child_die->tag)
16524 if (child_die->tag == DW_TAG_subrange_type)
16526 struct type *child_type = read_type_die (child_die, cu);
16528 if (child_type != NULL)
16530 /* The range type was succesfully read. Save it for the
16531 array type creation. */
16532 range_types.push_back (child_type);
16535 child_die = sibling_die (child_die);
16538 /* Dwarf2 dimensions are output from left to right, create the
16539 necessary array types in backwards order. */
16541 type = element_type;
16543 if (read_array_order (die, cu) == DW_ORD_col_major)
16547 while (i < range_types.size ())
16548 type = create_array_type_with_stride (NULL, type, range_types[i++],
16549 byte_stride_prop, bit_stride);
16553 size_t ndim = range_types.size ();
16555 type = create_array_type_with_stride (NULL, type, range_types[ndim],
16556 byte_stride_prop, bit_stride);
16559 /* Understand Dwarf2 support for vector types (like they occur on
16560 the PowerPC w/ AltiVec). Gcc just adds another attribute to the
16561 array type. This is not part of the Dwarf2/3 standard yet, but a
16562 custom vendor extension. The main difference between a regular
16563 array and the vector variant is that vectors are passed by value
16565 attr = dwarf2_attr (die, DW_AT_GNU_vector, cu);
16567 make_vector_type (type);
16569 /* The DIE may have DW_AT_byte_size set. For example an OpenCL
16570 implementation may choose to implement triple vectors using this
16572 attr = dwarf2_attr (die, DW_AT_byte_size, cu);
16575 if (DW_UNSND (attr) >= TYPE_LENGTH (type))
16576 TYPE_LENGTH (type) = DW_UNSND (attr);
16578 complaint (_("DW_AT_byte_size for array type smaller "
16579 "than the total size of elements"));
16582 name = dwarf2_name (die, cu);
16584 TYPE_NAME (type) = name;
16586 maybe_set_alignment (cu, die, type);
16588 /* Install the type in the die. */
16589 set_die_type (die, type, cu);
16591 /* set_die_type should be already done. */
16592 set_descriptive_type (type, die, cu);
16597 static enum dwarf_array_dim_ordering
16598 read_array_order (struct die_info *die, struct dwarf2_cu *cu)
16600 struct attribute *attr;
16602 attr = dwarf2_attr (die, DW_AT_ordering, cu);
16605 return (enum dwarf_array_dim_ordering) DW_SND (attr);
16607 /* GNU F77 is a special case, as at 08/2004 array type info is the
16608 opposite order to the dwarf2 specification, but data is still
16609 laid out as per normal fortran.
16611 FIXME: dsl/2004-8-20: If G77 is ever fixed, this will also need
16612 version checking. */
16614 if (cu->language == language_fortran
16615 && cu->producer && strstr (cu->producer, "GNU F77"))
16617 return DW_ORD_row_major;
16620 switch (cu->language_defn->la_array_ordering)
16622 case array_column_major:
16623 return DW_ORD_col_major;
16624 case array_row_major:
16626 return DW_ORD_row_major;
16630 /* Extract all information from a DW_TAG_set_type DIE and put it in
16631 the DIE's type field. */
16633 static struct type *
16634 read_set_type (struct die_info *die, struct dwarf2_cu *cu)
16636 struct type *domain_type, *set_type;
16637 struct attribute *attr;
16639 domain_type = die_type (die, cu);
16641 /* The die_type call above may have already set the type for this DIE. */
16642 set_type = get_die_type (die, cu);
16646 set_type = create_set_type (NULL, domain_type);
16648 attr = dwarf2_attr (die, DW_AT_byte_size, cu);
16650 TYPE_LENGTH (set_type) = DW_UNSND (attr);
16652 maybe_set_alignment (cu, die, set_type);
16654 return set_die_type (die, set_type, cu);
16657 /* A helper for read_common_block that creates a locexpr baton.
16658 SYM is the symbol which we are marking as computed.
16659 COMMON_DIE is the DIE for the common block.
16660 COMMON_LOC is the location expression attribute for the common
16662 MEMBER_LOC is the location expression attribute for the particular
16663 member of the common block that we are processing.
16664 CU is the CU from which the above come. */
16667 mark_common_block_symbol_computed (struct symbol *sym,
16668 struct die_info *common_die,
16669 struct attribute *common_loc,
16670 struct attribute *member_loc,
16671 struct dwarf2_cu *cu)
16673 struct dwarf2_per_objfile *dwarf2_per_objfile
16674 = cu->per_cu->dwarf2_per_objfile;
16675 struct objfile *objfile = dwarf2_per_objfile->objfile;
16676 struct dwarf2_locexpr_baton *baton;
16678 unsigned int cu_off;
16679 enum bfd_endian byte_order = gdbarch_byte_order (get_objfile_arch (objfile));
16680 LONGEST offset = 0;
16682 gdb_assert (common_loc && member_loc);
16683 gdb_assert (attr_form_is_block (common_loc));
16684 gdb_assert (attr_form_is_block (member_loc)
16685 || attr_form_is_constant (member_loc));
16687 baton = XOBNEW (&objfile->objfile_obstack, struct dwarf2_locexpr_baton);
16688 baton->per_cu = cu->per_cu;
16689 gdb_assert (baton->per_cu);
16691 baton->size = 5 /* DW_OP_call4 */ + 1 /* DW_OP_plus */;
16693 if (attr_form_is_constant (member_loc))
16695 offset = dwarf2_get_attr_constant_value (member_loc, 0);
16696 baton->size += 1 /* DW_OP_addr */ + cu->header.addr_size;
16699 baton->size += DW_BLOCK (member_loc)->size;
16701 ptr = (gdb_byte *) obstack_alloc (&objfile->objfile_obstack, baton->size);
16704 *ptr++ = DW_OP_call4;
16705 cu_off = common_die->sect_off - cu->per_cu->sect_off;
16706 store_unsigned_integer (ptr, 4, byte_order, cu_off);
16709 if (attr_form_is_constant (member_loc))
16711 *ptr++ = DW_OP_addr;
16712 store_unsigned_integer (ptr, cu->header.addr_size, byte_order, offset);
16713 ptr += cu->header.addr_size;
16717 /* We have to copy the data here, because DW_OP_call4 will only
16718 use a DW_AT_location attribute. */
16719 memcpy (ptr, DW_BLOCK (member_loc)->data, DW_BLOCK (member_loc)->size);
16720 ptr += DW_BLOCK (member_loc)->size;
16723 *ptr++ = DW_OP_plus;
16724 gdb_assert (ptr - baton->data == baton->size);
16726 SYMBOL_LOCATION_BATON (sym) = baton;
16727 SYMBOL_ACLASS_INDEX (sym) = dwarf2_locexpr_index;
16730 /* Create appropriate locally-scoped variables for all the
16731 DW_TAG_common_block entries. Also create a struct common_block
16732 listing all such variables for `info common'. COMMON_BLOCK_DOMAIN
16733 is used to sepate the common blocks name namespace from regular
16737 read_common_block (struct die_info *die, struct dwarf2_cu *cu)
16739 struct attribute *attr;
16741 attr = dwarf2_attr (die, DW_AT_location, cu);
16744 /* Support the .debug_loc offsets. */
16745 if (attr_form_is_block (attr))
16749 else if (attr_form_is_section_offset (attr))
16751 dwarf2_complex_location_expr_complaint ();
16756 dwarf2_invalid_attrib_class_complaint ("DW_AT_location",
16757 "common block member");
16762 if (die->child != NULL)
16764 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
16765 struct die_info *child_die;
16766 size_t n_entries = 0, size;
16767 struct common_block *common_block;
16768 struct symbol *sym;
16770 for (child_die = die->child;
16771 child_die && child_die->tag;
16772 child_die = sibling_die (child_die))
16775 size = (sizeof (struct common_block)
16776 + (n_entries - 1) * sizeof (struct symbol *));
16778 = (struct common_block *) obstack_alloc (&objfile->objfile_obstack,
16780 memset (common_block->contents, 0, n_entries * sizeof (struct symbol *));
16781 common_block->n_entries = 0;
16783 for (child_die = die->child;
16784 child_die && child_die->tag;
16785 child_die = sibling_die (child_die))
16787 /* Create the symbol in the DW_TAG_common_block block in the current
16789 sym = new_symbol (child_die, NULL, cu);
16792 struct attribute *member_loc;
16794 common_block->contents[common_block->n_entries++] = sym;
16796 member_loc = dwarf2_attr (child_die, DW_AT_data_member_location,
16800 /* GDB has handled this for a long time, but it is
16801 not specified by DWARF. It seems to have been
16802 emitted by gfortran at least as recently as:
16803 http://gcc.gnu.org/bugzilla/show_bug.cgi?id=23057. */
16804 complaint (_("Variable in common block has "
16805 "DW_AT_data_member_location "
16806 "- DIE at %s [in module %s]"),
16807 sect_offset_str (child_die->sect_off),
16808 objfile_name (objfile));
16810 if (attr_form_is_section_offset (member_loc))
16811 dwarf2_complex_location_expr_complaint ();
16812 else if (attr_form_is_constant (member_loc)
16813 || attr_form_is_block (member_loc))
16816 mark_common_block_symbol_computed (sym, die, attr,
16820 dwarf2_complex_location_expr_complaint ();
16825 sym = new_symbol (die, objfile_type (objfile)->builtin_void, cu);
16826 SYMBOL_VALUE_COMMON_BLOCK (sym) = common_block;
16830 /* Create a type for a C++ namespace. */
16832 static struct type *
16833 read_namespace_type (struct die_info *die, struct dwarf2_cu *cu)
16835 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
16836 const char *previous_prefix, *name;
16840 /* For extensions, reuse the type of the original namespace. */
16841 if (dwarf2_attr (die, DW_AT_extension, cu) != NULL)
16843 struct die_info *ext_die;
16844 struct dwarf2_cu *ext_cu = cu;
16846 ext_die = dwarf2_extension (die, &ext_cu);
16847 type = read_type_die (ext_die, ext_cu);
16849 /* EXT_CU may not be the same as CU.
16850 Ensure TYPE is recorded with CU in die_type_hash. */
16851 return set_die_type (die, type, cu);
16854 name = namespace_name (die, &is_anonymous, cu);
16856 /* Now build the name of the current namespace. */
16858 previous_prefix = determine_prefix (die, cu);
16859 if (previous_prefix[0] != '\0')
16860 name = typename_concat (&objfile->objfile_obstack,
16861 previous_prefix, name, 0, cu);
16863 /* Create the type. */
16864 type = init_type (objfile, TYPE_CODE_NAMESPACE, 0, name);
16866 return set_die_type (die, type, cu);
16869 /* Read a namespace scope. */
16872 read_namespace (struct die_info *die, struct dwarf2_cu *cu)
16874 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
16877 /* Add a symbol associated to this if we haven't seen the namespace
16878 before. Also, add a using directive if it's an anonymous
16881 if (dwarf2_attr (die, DW_AT_extension, cu) == NULL)
16885 type = read_type_die (die, cu);
16886 new_symbol (die, type, cu);
16888 namespace_name (die, &is_anonymous, cu);
16891 const char *previous_prefix = determine_prefix (die, cu);
16893 std::vector<const char *> excludes;
16894 add_using_directive (using_directives (cu),
16895 previous_prefix, TYPE_NAME (type), NULL,
16896 NULL, excludes, 0, &objfile->objfile_obstack);
16900 if (die->child != NULL)
16902 struct die_info *child_die = die->child;
16904 while (child_die && child_die->tag)
16906 process_die (child_die, cu);
16907 child_die = sibling_die (child_die);
16912 /* Read a Fortran module as type. This DIE can be only a declaration used for
16913 imported module. Still we need that type as local Fortran "use ... only"
16914 declaration imports depend on the created type in determine_prefix. */
16916 static struct type *
16917 read_module_type (struct die_info *die, struct dwarf2_cu *cu)
16919 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
16920 const char *module_name;
16923 module_name = dwarf2_name (die, cu);
16925 complaint (_("DW_TAG_module has no name, offset %s"),
16926 sect_offset_str (die->sect_off));
16927 type = init_type (objfile, TYPE_CODE_MODULE, 0, module_name);
16929 return set_die_type (die, type, cu);
16932 /* Read a Fortran module. */
16935 read_module (struct die_info *die, struct dwarf2_cu *cu)
16937 struct die_info *child_die = die->child;
16940 type = read_type_die (die, cu);
16941 new_symbol (die, type, cu);
16943 while (child_die && child_die->tag)
16945 process_die (child_die, cu);
16946 child_die = sibling_die (child_die);
16950 /* Return the name of the namespace represented by DIE. Set
16951 *IS_ANONYMOUS to tell whether or not the namespace is an anonymous
16954 static const char *
16955 namespace_name (struct die_info *die, int *is_anonymous, struct dwarf2_cu *cu)
16957 struct die_info *current_die;
16958 const char *name = NULL;
16960 /* Loop through the extensions until we find a name. */
16962 for (current_die = die;
16963 current_die != NULL;
16964 current_die = dwarf2_extension (die, &cu))
16966 /* We don't use dwarf2_name here so that we can detect the absence
16967 of a name -> anonymous namespace. */
16968 name = dwarf2_string_attr (die, DW_AT_name, cu);
16974 /* Is it an anonymous namespace? */
16976 *is_anonymous = (name == NULL);
16978 name = CP_ANONYMOUS_NAMESPACE_STR;
16983 /* Extract all information from a DW_TAG_pointer_type DIE and add to
16984 the user defined type vector. */
16986 static struct type *
16987 read_tag_pointer_type (struct die_info *die, struct dwarf2_cu *cu)
16989 struct gdbarch *gdbarch
16990 = get_objfile_arch (cu->per_cu->dwarf2_per_objfile->objfile);
16991 struct comp_unit_head *cu_header = &cu->header;
16993 struct attribute *attr_byte_size;
16994 struct attribute *attr_address_class;
16995 int byte_size, addr_class;
16996 struct type *target_type;
16998 target_type = die_type (die, cu);
17000 /* The die_type call above may have already set the type for this DIE. */
17001 type = get_die_type (die, cu);
17005 type = lookup_pointer_type (target_type);
17007 attr_byte_size = dwarf2_attr (die, DW_AT_byte_size, cu);
17008 if (attr_byte_size)
17009 byte_size = DW_UNSND (attr_byte_size);
17011 byte_size = cu_header->addr_size;
17013 attr_address_class = dwarf2_attr (die, DW_AT_address_class, cu);
17014 if (attr_address_class)
17015 addr_class = DW_UNSND (attr_address_class);
17017 addr_class = DW_ADDR_none;
17019 ULONGEST alignment = get_alignment (cu, die);
17021 /* If the pointer size, alignment, or address class is different
17022 than the default, create a type variant marked as such and set
17023 the length accordingly. */
17024 if (TYPE_LENGTH (type) != byte_size
17025 || (alignment != 0 && TYPE_RAW_ALIGN (type) != 0
17026 && alignment != TYPE_RAW_ALIGN (type))
17027 || addr_class != DW_ADDR_none)
17029 if (gdbarch_address_class_type_flags_p (gdbarch))
17033 type_flags = gdbarch_address_class_type_flags
17034 (gdbarch, byte_size, addr_class);
17035 gdb_assert ((type_flags & ~TYPE_INSTANCE_FLAG_ADDRESS_CLASS_ALL)
17037 type = make_type_with_address_space (type, type_flags);
17039 else if (TYPE_LENGTH (type) != byte_size)
17041 complaint (_("invalid pointer size %d"), byte_size);
17043 else if (TYPE_RAW_ALIGN (type) != alignment)
17045 complaint (_("Invalid DW_AT_alignment"
17046 " - DIE at %s [in module %s]"),
17047 sect_offset_str (die->sect_off),
17048 objfile_name (cu->per_cu->dwarf2_per_objfile->objfile));
17052 /* Should we also complain about unhandled address classes? */
17056 TYPE_LENGTH (type) = byte_size;
17057 set_type_align (type, alignment);
17058 return set_die_type (die, type, cu);
17061 /* Extract all information from a DW_TAG_ptr_to_member_type DIE and add to
17062 the user defined type vector. */
17064 static struct type *
17065 read_tag_ptr_to_member_type (struct die_info *die, struct dwarf2_cu *cu)
17068 struct type *to_type;
17069 struct type *domain;
17071 to_type = die_type (die, cu);
17072 domain = die_containing_type (die, cu);
17074 /* The calls above may have already set the type for this DIE. */
17075 type = get_die_type (die, cu);
17079 if (TYPE_CODE (check_typedef (to_type)) == TYPE_CODE_METHOD)
17080 type = lookup_methodptr_type (to_type);
17081 else if (TYPE_CODE (check_typedef (to_type)) == TYPE_CODE_FUNC)
17083 struct type *new_type
17084 = alloc_type (cu->per_cu->dwarf2_per_objfile->objfile);
17086 smash_to_method_type (new_type, domain, TYPE_TARGET_TYPE (to_type),
17087 TYPE_FIELDS (to_type), TYPE_NFIELDS (to_type),
17088 TYPE_VARARGS (to_type));
17089 type = lookup_methodptr_type (new_type);
17092 type = lookup_memberptr_type (to_type, domain);
17094 return set_die_type (die, type, cu);
17097 /* Extract all information from a DW_TAG_{rvalue_,}reference_type DIE and add to
17098 the user defined type vector. */
17100 static struct type *
17101 read_tag_reference_type (struct die_info *die, struct dwarf2_cu *cu,
17102 enum type_code refcode)
17104 struct comp_unit_head *cu_header = &cu->header;
17105 struct type *type, *target_type;
17106 struct attribute *attr;
17108 gdb_assert (refcode == TYPE_CODE_REF || refcode == TYPE_CODE_RVALUE_REF);
17110 target_type = die_type (die, cu);
17112 /* The die_type call above may have already set the type for this DIE. */
17113 type = get_die_type (die, cu);
17117 type = lookup_reference_type (target_type, refcode);
17118 attr = dwarf2_attr (die, DW_AT_byte_size, cu);
17121 TYPE_LENGTH (type) = DW_UNSND (attr);
17125 TYPE_LENGTH (type) = cu_header->addr_size;
17127 maybe_set_alignment (cu, die, type);
17128 return set_die_type (die, type, cu);
17131 /* Add the given cv-qualifiers to the element type of the array. GCC
17132 outputs DWARF type qualifiers that apply to an array, not the
17133 element type. But GDB relies on the array element type to carry
17134 the cv-qualifiers. This mimics section 6.7.3 of the C99
17137 static struct type *
17138 add_array_cv_type (struct die_info *die, struct dwarf2_cu *cu,
17139 struct type *base_type, int cnst, int voltl)
17141 struct type *el_type, *inner_array;
17143 base_type = copy_type (base_type);
17144 inner_array = base_type;
17146 while (TYPE_CODE (TYPE_TARGET_TYPE (inner_array)) == TYPE_CODE_ARRAY)
17148 TYPE_TARGET_TYPE (inner_array) =
17149 copy_type (TYPE_TARGET_TYPE (inner_array));
17150 inner_array = TYPE_TARGET_TYPE (inner_array);
17153 el_type = TYPE_TARGET_TYPE (inner_array);
17154 cnst |= TYPE_CONST (el_type);
17155 voltl |= TYPE_VOLATILE (el_type);
17156 TYPE_TARGET_TYPE (inner_array) = make_cv_type (cnst, voltl, el_type, NULL);
17158 return set_die_type (die, base_type, cu);
17161 static struct type *
17162 read_tag_const_type (struct die_info *die, struct dwarf2_cu *cu)
17164 struct type *base_type, *cv_type;
17166 base_type = die_type (die, cu);
17168 /* The die_type call above may have already set the type for this DIE. */
17169 cv_type = get_die_type (die, cu);
17173 /* In case the const qualifier is applied to an array type, the element type
17174 is so qualified, not the array type (section 6.7.3 of C99). */
17175 if (TYPE_CODE (base_type) == TYPE_CODE_ARRAY)
17176 return add_array_cv_type (die, cu, base_type, 1, 0);
17178 cv_type = make_cv_type (1, TYPE_VOLATILE (base_type), base_type, 0);
17179 return set_die_type (die, cv_type, cu);
17182 static struct type *
17183 read_tag_volatile_type (struct die_info *die, struct dwarf2_cu *cu)
17185 struct type *base_type, *cv_type;
17187 base_type = die_type (die, cu);
17189 /* The die_type call above may have already set the type for this DIE. */
17190 cv_type = get_die_type (die, cu);
17194 /* In case the volatile qualifier is applied to an array type, the
17195 element type is so qualified, not the array type (section 6.7.3
17197 if (TYPE_CODE (base_type) == TYPE_CODE_ARRAY)
17198 return add_array_cv_type (die, cu, base_type, 0, 1);
17200 cv_type = make_cv_type (TYPE_CONST (base_type), 1, base_type, 0);
17201 return set_die_type (die, cv_type, cu);
17204 /* Handle DW_TAG_restrict_type. */
17206 static struct type *
17207 read_tag_restrict_type (struct die_info *die, struct dwarf2_cu *cu)
17209 struct type *base_type, *cv_type;
17211 base_type = die_type (die, cu);
17213 /* The die_type call above may have already set the type for this DIE. */
17214 cv_type = get_die_type (die, cu);
17218 cv_type = make_restrict_type (base_type);
17219 return set_die_type (die, cv_type, cu);
17222 /* Handle DW_TAG_atomic_type. */
17224 static struct type *
17225 read_tag_atomic_type (struct die_info *die, struct dwarf2_cu *cu)
17227 struct type *base_type, *cv_type;
17229 base_type = die_type (die, cu);
17231 /* The die_type call above may have already set the type for this DIE. */
17232 cv_type = get_die_type (die, cu);
17236 cv_type = make_atomic_type (base_type);
17237 return set_die_type (die, cv_type, cu);
17240 /* Extract all information from a DW_TAG_string_type DIE and add to
17241 the user defined type vector. It isn't really a user defined type,
17242 but it behaves like one, with other DIE's using an AT_user_def_type
17243 attribute to reference it. */
17245 static struct type *
17246 read_tag_string_type (struct die_info *die, struct dwarf2_cu *cu)
17248 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
17249 struct gdbarch *gdbarch = get_objfile_arch (objfile);
17250 struct type *type, *range_type, *index_type, *char_type;
17251 struct attribute *attr;
17252 unsigned int length;
17254 attr = dwarf2_attr (die, DW_AT_string_length, cu);
17257 length = DW_UNSND (attr);
17261 /* Check for the DW_AT_byte_size attribute. */
17262 attr = dwarf2_attr (die, DW_AT_byte_size, cu);
17265 length = DW_UNSND (attr);
17273 index_type = objfile_type (objfile)->builtin_int;
17274 range_type = create_static_range_type (NULL, index_type, 1, length);
17275 char_type = language_string_char_type (cu->language_defn, gdbarch);
17276 type = create_string_type (NULL, char_type, range_type);
17278 return set_die_type (die, type, cu);
17281 /* Assuming that DIE corresponds to a function, returns nonzero
17282 if the function is prototyped. */
17285 prototyped_function_p (struct die_info *die, struct dwarf2_cu *cu)
17287 struct attribute *attr;
17289 attr = dwarf2_attr (die, DW_AT_prototyped, cu);
17290 if (attr && (DW_UNSND (attr) != 0))
17293 /* The DWARF standard implies that the DW_AT_prototyped attribute
17294 is only meaninful for C, but the concept also extends to other
17295 languages that allow unprototyped functions (Eg: Objective C).
17296 For all other languages, assume that functions are always
17298 if (cu->language != language_c
17299 && cu->language != language_objc
17300 && cu->language != language_opencl)
17303 /* RealView does not emit DW_AT_prototyped. We can not distinguish
17304 prototyped and unprototyped functions; default to prototyped,
17305 since that is more common in modern code (and RealView warns
17306 about unprototyped functions). */
17307 if (producer_is_realview (cu->producer))
17313 /* Handle DIES due to C code like:
17317 int (*funcp)(int a, long l);
17321 ('funcp' generates a DW_TAG_subroutine_type DIE). */
17323 static struct type *
17324 read_subroutine_type (struct die_info *die, struct dwarf2_cu *cu)
17326 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
17327 struct type *type; /* Type that this function returns. */
17328 struct type *ftype; /* Function that returns above type. */
17329 struct attribute *attr;
17331 type = die_type (die, cu);
17333 /* The die_type call above may have already set the type for this DIE. */
17334 ftype = get_die_type (die, cu);
17338 ftype = lookup_function_type (type);
17340 if (prototyped_function_p (die, cu))
17341 TYPE_PROTOTYPED (ftype) = 1;
17343 /* Store the calling convention in the type if it's available in
17344 the subroutine die. Otherwise set the calling convention to
17345 the default value DW_CC_normal. */
17346 attr = dwarf2_attr (die, DW_AT_calling_convention, cu);
17348 TYPE_CALLING_CONVENTION (ftype) = DW_UNSND (attr);
17349 else if (cu->producer && strstr (cu->producer, "IBM XL C for OpenCL"))
17350 TYPE_CALLING_CONVENTION (ftype) = DW_CC_GDB_IBM_OpenCL;
17352 TYPE_CALLING_CONVENTION (ftype) = DW_CC_normal;
17354 /* Record whether the function returns normally to its caller or not
17355 if the DWARF producer set that information. */
17356 attr = dwarf2_attr (die, DW_AT_noreturn, cu);
17357 if (attr && (DW_UNSND (attr) != 0))
17358 TYPE_NO_RETURN (ftype) = 1;
17360 /* We need to add the subroutine type to the die immediately so
17361 we don't infinitely recurse when dealing with parameters
17362 declared as the same subroutine type. */
17363 set_die_type (die, ftype, cu);
17365 if (die->child != NULL)
17367 struct type *void_type = objfile_type (objfile)->builtin_void;
17368 struct die_info *child_die;
17369 int nparams, iparams;
17371 /* Count the number of parameters.
17372 FIXME: GDB currently ignores vararg functions, but knows about
17373 vararg member functions. */
17375 child_die = die->child;
17376 while (child_die && child_die->tag)
17378 if (child_die->tag == DW_TAG_formal_parameter)
17380 else if (child_die->tag == DW_TAG_unspecified_parameters)
17381 TYPE_VARARGS (ftype) = 1;
17382 child_die = sibling_die (child_die);
17385 /* Allocate storage for parameters and fill them in. */
17386 TYPE_NFIELDS (ftype) = nparams;
17387 TYPE_FIELDS (ftype) = (struct field *)
17388 TYPE_ZALLOC (ftype, nparams * sizeof (struct field));
17390 /* TYPE_FIELD_TYPE must never be NULL. Pre-fill the array to ensure it
17391 even if we error out during the parameters reading below. */
17392 for (iparams = 0; iparams < nparams; iparams++)
17393 TYPE_FIELD_TYPE (ftype, iparams) = void_type;
17396 child_die = die->child;
17397 while (child_die && child_die->tag)
17399 if (child_die->tag == DW_TAG_formal_parameter)
17401 struct type *arg_type;
17403 /* DWARF version 2 has no clean way to discern C++
17404 static and non-static member functions. G++ helps
17405 GDB by marking the first parameter for non-static
17406 member functions (which is the this pointer) as
17407 artificial. We pass this information to
17408 dwarf2_add_member_fn via TYPE_FIELD_ARTIFICIAL.
17410 DWARF version 3 added DW_AT_object_pointer, which GCC
17411 4.5 does not yet generate. */
17412 attr = dwarf2_attr (child_die, DW_AT_artificial, cu);
17414 TYPE_FIELD_ARTIFICIAL (ftype, iparams) = DW_UNSND (attr);
17416 TYPE_FIELD_ARTIFICIAL (ftype, iparams) = 0;
17417 arg_type = die_type (child_die, cu);
17419 /* RealView does not mark THIS as const, which the testsuite
17420 expects. GCC marks THIS as const in method definitions,
17421 but not in the class specifications (GCC PR 43053). */
17422 if (cu->language == language_cplus && !TYPE_CONST (arg_type)
17423 && TYPE_FIELD_ARTIFICIAL (ftype, iparams))
17426 struct dwarf2_cu *arg_cu = cu;
17427 const char *name = dwarf2_name (child_die, cu);
17429 attr = dwarf2_attr (die, DW_AT_object_pointer, cu);
17432 /* If the compiler emits this, use it. */
17433 if (follow_die_ref (die, attr, &arg_cu) == child_die)
17436 else if (name && strcmp (name, "this") == 0)
17437 /* Function definitions will have the argument names. */
17439 else if (name == NULL && iparams == 0)
17440 /* Declarations may not have the names, so like
17441 elsewhere in GDB, assume an artificial first
17442 argument is "this". */
17446 arg_type = make_cv_type (1, TYPE_VOLATILE (arg_type),
17450 TYPE_FIELD_TYPE (ftype, iparams) = arg_type;
17453 child_die = sibling_die (child_die);
17460 static struct type *
17461 read_typedef (struct die_info *die, struct dwarf2_cu *cu)
17463 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
17464 const char *name = NULL;
17465 struct type *this_type, *target_type;
17467 name = dwarf2_full_name (NULL, die, cu);
17468 this_type = init_type (objfile, TYPE_CODE_TYPEDEF, 0, name);
17469 TYPE_TARGET_STUB (this_type) = 1;
17470 set_die_type (die, this_type, cu);
17471 target_type = die_type (die, cu);
17472 if (target_type != this_type)
17473 TYPE_TARGET_TYPE (this_type) = target_type;
17476 /* Self-referential typedefs are, it seems, not allowed by the DWARF
17477 spec and cause infinite loops in GDB. */
17478 complaint (_("Self-referential DW_TAG_typedef "
17479 "- DIE at %s [in module %s]"),
17480 sect_offset_str (die->sect_off), objfile_name (objfile));
17481 TYPE_TARGET_TYPE (this_type) = NULL;
17486 /* Allocate a floating-point type of size BITS and name NAME. Pass NAME_HINT
17487 (which may be different from NAME) to the architecture back-end to allow
17488 it to guess the correct format if necessary. */
17490 static struct type *
17491 dwarf2_init_float_type (struct objfile *objfile, int bits, const char *name,
17492 const char *name_hint)
17494 struct gdbarch *gdbarch = get_objfile_arch (objfile);
17495 const struct floatformat **format;
17498 format = gdbarch_floatformat_for_type (gdbarch, name_hint, bits);
17500 type = init_float_type (objfile, bits, name, format);
17502 type = init_type (objfile, TYPE_CODE_ERROR, bits, name);
17507 /* Allocate an integer type of size BITS and name NAME. */
17509 static struct type *
17510 dwarf2_init_integer_type (struct dwarf2_cu *cu, struct objfile *objfile,
17511 int bits, int unsigned_p, const char *name)
17515 /* Versions of Intel's C Compiler generate an integer type called "void"
17516 instead of using DW_TAG_unspecified_type. This has been seen on
17517 at least versions 14, 17, and 18. */
17518 if (bits == 0 && producer_is_icc (cu) && name != nullptr
17519 && strcmp (name, "void") == 0)
17520 type = objfile_type (objfile)->builtin_void;
17522 type = init_integer_type (objfile, bits, unsigned_p, name);
17527 /* Initialise and return a floating point type of size BITS suitable for
17528 use as a component of a complex number. The NAME_HINT is passed through
17529 when initialising the floating point type and is the name of the complex
17532 As DWARF doesn't currently provide an explicit name for the components
17533 of a complex number, but it can be helpful to have these components
17534 named, we try to select a suitable name based on the size of the
17536 static struct type *
17537 dwarf2_init_complex_target_type (struct dwarf2_cu *cu,
17538 struct objfile *objfile,
17539 int bits, const char *name_hint)
17541 gdbarch *gdbarch = get_objfile_arch (objfile);
17542 struct type *tt = nullptr;
17544 /* Try to find a suitable floating point builtin type of size BITS.
17545 We're going to use the name of this type as the name for the complex
17546 target type that we are about to create. */
17550 tt = builtin_type (gdbarch)->builtin_float;
17553 tt = builtin_type (gdbarch)->builtin_double;
17555 case 96: /* The x86-32 ABI specifies 96-bit long double. */
17557 tt = builtin_type (gdbarch)->builtin_long_double;
17561 /* If the type we found doesn't match the size we were looking for, then
17562 pretend we didn't find a type at all, the complex target type we
17563 create will then be nameless. */
17564 if (tt != nullptr && TYPE_LENGTH (tt) * TARGET_CHAR_BIT != bits)
17567 const char *name = (tt == nullptr) ? nullptr : TYPE_NAME (tt);
17568 return dwarf2_init_float_type (objfile, bits, name, name_hint);
17571 /* Find a representation of a given base type and install
17572 it in the TYPE field of the die. */
17574 static struct type *
17575 read_base_type (struct die_info *die, struct dwarf2_cu *cu)
17577 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
17579 struct attribute *attr;
17580 int encoding = 0, bits = 0;
17583 attr = dwarf2_attr (die, DW_AT_encoding, cu);
17586 encoding = DW_UNSND (attr);
17588 attr = dwarf2_attr (die, DW_AT_byte_size, cu);
17591 bits = DW_UNSND (attr) * TARGET_CHAR_BIT;
17593 name = dwarf2_name (die, cu);
17596 complaint (_("DW_AT_name missing from DW_TAG_base_type"));
17601 case DW_ATE_address:
17602 /* Turn DW_ATE_address into a void * pointer. */
17603 type = init_type (objfile, TYPE_CODE_VOID, TARGET_CHAR_BIT, NULL);
17604 type = init_pointer_type (objfile, bits, name, type);
17606 case DW_ATE_boolean:
17607 type = init_boolean_type (objfile, bits, 1, name);
17609 case DW_ATE_complex_float:
17610 type = dwarf2_init_complex_target_type (cu, objfile, bits / 2, name);
17611 type = init_complex_type (objfile, name, type);
17613 case DW_ATE_decimal_float:
17614 type = init_decfloat_type (objfile, bits, name);
17617 type = dwarf2_init_float_type (objfile, bits, name, name);
17619 case DW_ATE_signed:
17620 type = dwarf2_init_integer_type (cu, objfile, bits, 0, name);
17622 case DW_ATE_unsigned:
17623 if (cu->language == language_fortran
17625 && startswith (name, "character("))
17626 type = init_character_type (objfile, bits, 1, name);
17628 type = dwarf2_init_integer_type (cu, objfile, bits, 1, name);
17630 case DW_ATE_signed_char:
17631 if (cu->language == language_ada || cu->language == language_m2
17632 || cu->language == language_pascal
17633 || cu->language == language_fortran)
17634 type = init_character_type (objfile, bits, 0, name);
17636 type = dwarf2_init_integer_type (cu, objfile, bits, 0, name);
17638 case DW_ATE_unsigned_char:
17639 if (cu->language == language_ada || cu->language == language_m2
17640 || cu->language == language_pascal
17641 || cu->language == language_fortran
17642 || cu->language == language_rust)
17643 type = init_character_type (objfile, bits, 1, name);
17645 type = dwarf2_init_integer_type (cu, objfile, bits, 1, name);
17649 gdbarch *arch = get_objfile_arch (objfile);
17652 type = builtin_type (arch)->builtin_char16;
17653 else if (bits == 32)
17654 type = builtin_type (arch)->builtin_char32;
17657 complaint (_("unsupported DW_ATE_UTF bit size: '%d'"),
17659 type = dwarf2_init_integer_type (cu, objfile, bits, 1, name);
17661 return set_die_type (die, type, cu);
17666 complaint (_("unsupported DW_AT_encoding: '%s'"),
17667 dwarf_type_encoding_name (encoding));
17668 type = init_type (objfile, TYPE_CODE_ERROR, bits, name);
17672 if (name && strcmp (name, "char") == 0)
17673 TYPE_NOSIGN (type) = 1;
17675 maybe_set_alignment (cu, die, type);
17677 return set_die_type (die, type, cu);
17680 /* Parse dwarf attribute if it's a block, reference or constant and put the
17681 resulting value of the attribute into struct bound_prop.
17682 Returns 1 if ATTR could be resolved into PROP, 0 otherwise. */
17685 attr_to_dynamic_prop (const struct attribute *attr, struct die_info *die,
17686 struct dwarf2_cu *cu, struct dynamic_prop *prop)
17688 struct dwarf2_property_baton *baton;
17689 struct obstack *obstack
17690 = &cu->per_cu->dwarf2_per_objfile->objfile->objfile_obstack;
17692 if (attr == NULL || prop == NULL)
17695 if (attr_form_is_block (attr))
17697 baton = XOBNEW (obstack, struct dwarf2_property_baton);
17698 baton->referenced_type = NULL;
17699 baton->locexpr.per_cu = cu->per_cu;
17700 baton->locexpr.size = DW_BLOCK (attr)->size;
17701 baton->locexpr.data = DW_BLOCK (attr)->data;
17702 prop->data.baton = baton;
17703 prop->kind = PROP_LOCEXPR;
17704 gdb_assert (prop->data.baton != NULL);
17706 else if (attr_form_is_ref (attr))
17708 struct dwarf2_cu *target_cu = cu;
17709 struct die_info *target_die;
17710 struct attribute *target_attr;
17712 target_die = follow_die_ref (die, attr, &target_cu);
17713 target_attr = dwarf2_attr (target_die, DW_AT_location, target_cu);
17714 if (target_attr == NULL)
17715 target_attr = dwarf2_attr (target_die, DW_AT_data_member_location,
17717 if (target_attr == NULL)
17720 switch (target_attr->name)
17722 case DW_AT_location:
17723 if (attr_form_is_section_offset (target_attr))
17725 baton = XOBNEW (obstack, struct dwarf2_property_baton);
17726 baton->referenced_type = die_type (target_die, target_cu);
17727 fill_in_loclist_baton (cu, &baton->loclist, target_attr);
17728 prop->data.baton = baton;
17729 prop->kind = PROP_LOCLIST;
17730 gdb_assert (prop->data.baton != NULL);
17732 else if (attr_form_is_block (target_attr))
17734 baton = XOBNEW (obstack, struct dwarf2_property_baton);
17735 baton->referenced_type = die_type (target_die, target_cu);
17736 baton->locexpr.per_cu = cu->per_cu;
17737 baton->locexpr.size = DW_BLOCK (target_attr)->size;
17738 baton->locexpr.data = DW_BLOCK (target_attr)->data;
17739 prop->data.baton = baton;
17740 prop->kind = PROP_LOCEXPR;
17741 gdb_assert (prop->data.baton != NULL);
17745 dwarf2_invalid_attrib_class_complaint ("DW_AT_location",
17746 "dynamic property");
17750 case DW_AT_data_member_location:
17754 if (!handle_data_member_location (target_die, target_cu,
17758 baton = XOBNEW (obstack, struct dwarf2_property_baton);
17759 baton->referenced_type = read_type_die (target_die->parent,
17761 baton->offset_info.offset = offset;
17762 baton->offset_info.type = die_type (target_die, target_cu);
17763 prop->data.baton = baton;
17764 prop->kind = PROP_ADDR_OFFSET;
17769 else if (attr_form_is_constant (attr))
17771 prop->data.const_val = dwarf2_get_attr_constant_value (attr, 0);
17772 prop->kind = PROP_CONST;
17776 dwarf2_invalid_attrib_class_complaint (dwarf_form_name (attr->form),
17777 dwarf2_name (die, cu));
17784 /* Read the given DW_AT_subrange DIE. */
17786 static struct type *
17787 read_subrange_type (struct die_info *die, struct dwarf2_cu *cu)
17789 struct type *base_type, *orig_base_type;
17790 struct type *range_type;
17791 struct attribute *attr;
17792 struct dynamic_prop low, high;
17793 int low_default_is_valid;
17794 int high_bound_is_count = 0;
17796 ULONGEST negative_mask;
17798 orig_base_type = die_type (die, cu);
17799 /* If ORIG_BASE_TYPE is a typedef, it will not be TYPE_UNSIGNED,
17800 whereas the real type might be. So, we use ORIG_BASE_TYPE when
17801 creating the range type, but we use the result of check_typedef
17802 when examining properties of the type. */
17803 base_type = check_typedef (orig_base_type);
17805 /* The die_type call above may have already set the type for this DIE. */
17806 range_type = get_die_type (die, cu);
17810 low.kind = PROP_CONST;
17811 high.kind = PROP_CONST;
17812 high.data.const_val = 0;
17814 /* Set LOW_DEFAULT_IS_VALID if current language and DWARF version allow
17815 omitting DW_AT_lower_bound. */
17816 switch (cu->language)
17819 case language_cplus:
17820 low.data.const_val = 0;
17821 low_default_is_valid = 1;
17823 case language_fortran:
17824 low.data.const_val = 1;
17825 low_default_is_valid = 1;
17828 case language_objc:
17829 case language_rust:
17830 low.data.const_val = 0;
17831 low_default_is_valid = (cu->header.version >= 4);
17835 case language_pascal:
17836 low.data.const_val = 1;
17837 low_default_is_valid = (cu->header.version >= 4);
17840 low.data.const_val = 0;
17841 low_default_is_valid = 0;
17845 attr = dwarf2_attr (die, DW_AT_lower_bound, cu);
17847 attr_to_dynamic_prop (attr, die, cu, &low);
17848 else if (!low_default_is_valid)
17849 complaint (_("Missing DW_AT_lower_bound "
17850 "- DIE at %s [in module %s]"),
17851 sect_offset_str (die->sect_off),
17852 objfile_name (cu->per_cu->dwarf2_per_objfile->objfile));
17854 struct attribute *attr_ub, *attr_count;
17855 attr = attr_ub = dwarf2_attr (die, DW_AT_upper_bound, cu);
17856 if (!attr_to_dynamic_prop (attr, die, cu, &high))
17858 attr = attr_count = dwarf2_attr (die, DW_AT_count, cu);
17859 if (attr_to_dynamic_prop (attr, die, cu, &high))
17861 /* If bounds are constant do the final calculation here. */
17862 if (low.kind == PROP_CONST && high.kind == PROP_CONST)
17863 high.data.const_val = low.data.const_val + high.data.const_val - 1;
17865 high_bound_is_count = 1;
17869 if (attr_ub != NULL)
17870 complaint (_("Unresolved DW_AT_upper_bound "
17871 "- DIE at %s [in module %s]"),
17872 sect_offset_str (die->sect_off),
17873 objfile_name (cu->per_cu->dwarf2_per_objfile->objfile));
17874 if (attr_count != NULL)
17875 complaint (_("Unresolved DW_AT_count "
17876 "- DIE at %s [in module %s]"),
17877 sect_offset_str (die->sect_off),
17878 objfile_name (cu->per_cu->dwarf2_per_objfile->objfile));
17883 /* Dwarf-2 specifications explicitly allows to create subrange types
17884 without specifying a base type.
17885 In that case, the base type must be set to the type of
17886 the lower bound, upper bound or count, in that order, if any of these
17887 three attributes references an object that has a type.
17888 If no base type is found, the Dwarf-2 specifications say that
17889 a signed integer type of size equal to the size of an address should
17891 For the following C code: `extern char gdb_int [];'
17892 GCC produces an empty range DIE.
17893 FIXME: muller/2010-05-28: Possible references to object for low bound,
17894 high bound or count are not yet handled by this code. */
17895 if (TYPE_CODE (base_type) == TYPE_CODE_VOID)
17897 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
17898 struct gdbarch *gdbarch = get_objfile_arch (objfile);
17899 int addr_size = gdbarch_addr_bit (gdbarch) /8;
17900 struct type *int_type = objfile_type (objfile)->builtin_int;
17902 /* Test "int", "long int", and "long long int" objfile types,
17903 and select the first one having a size above or equal to the
17904 architecture address size. */
17905 if (int_type && TYPE_LENGTH (int_type) >= addr_size)
17906 base_type = int_type;
17909 int_type = objfile_type (objfile)->builtin_long;
17910 if (int_type && TYPE_LENGTH (int_type) >= addr_size)
17911 base_type = int_type;
17914 int_type = objfile_type (objfile)->builtin_long_long;
17915 if (int_type && TYPE_LENGTH (int_type) >= addr_size)
17916 base_type = int_type;
17921 /* Normally, the DWARF producers are expected to use a signed
17922 constant form (Eg. DW_FORM_sdata) to express negative bounds.
17923 But this is unfortunately not always the case, as witnessed
17924 with GCC, for instance, where the ambiguous DW_FORM_dataN form
17925 is used instead. To work around that ambiguity, we treat
17926 the bounds as signed, and thus sign-extend their values, when
17927 the base type is signed. */
17929 -((ULONGEST) 1 << (TYPE_LENGTH (base_type) * TARGET_CHAR_BIT - 1));
17930 if (low.kind == PROP_CONST
17931 && !TYPE_UNSIGNED (base_type) && (low.data.const_val & negative_mask))
17932 low.data.const_val |= negative_mask;
17933 if (high.kind == PROP_CONST
17934 && !TYPE_UNSIGNED (base_type) && (high.data.const_val & negative_mask))
17935 high.data.const_val |= negative_mask;
17937 range_type = create_range_type (NULL, orig_base_type, &low, &high);
17939 if (high_bound_is_count)
17940 TYPE_RANGE_DATA (range_type)->flag_upper_bound_is_count = 1;
17942 /* Ada expects an empty array on no boundary attributes. */
17943 if (attr == NULL && cu->language != language_ada)
17944 TYPE_HIGH_BOUND_KIND (range_type) = PROP_UNDEFINED;
17946 name = dwarf2_name (die, cu);
17948 TYPE_NAME (range_type) = name;
17950 attr = dwarf2_attr (die, DW_AT_byte_size, cu);
17952 TYPE_LENGTH (range_type) = DW_UNSND (attr);
17954 maybe_set_alignment (cu, die, range_type);
17956 set_die_type (die, range_type, cu);
17958 /* set_die_type should be already done. */
17959 set_descriptive_type (range_type, die, cu);
17964 static struct type *
17965 read_unspecified_type (struct die_info *die, struct dwarf2_cu *cu)
17969 type = init_type (cu->per_cu->dwarf2_per_objfile->objfile, TYPE_CODE_VOID,0,
17971 TYPE_NAME (type) = dwarf2_name (die, cu);
17973 /* In Ada, an unspecified type is typically used when the description
17974 of the type is defered to a different unit. When encountering
17975 such a type, we treat it as a stub, and try to resolve it later on,
17977 if (cu->language == language_ada)
17978 TYPE_STUB (type) = 1;
17980 return set_die_type (die, type, cu);
17983 /* Read a single die and all its descendents. Set the die's sibling
17984 field to NULL; set other fields in the die correctly, and set all
17985 of the descendents' fields correctly. Set *NEW_INFO_PTR to the
17986 location of the info_ptr after reading all of those dies. PARENT
17987 is the parent of the die in question. */
17989 static struct die_info *
17990 read_die_and_children (const struct die_reader_specs *reader,
17991 const gdb_byte *info_ptr,
17992 const gdb_byte **new_info_ptr,
17993 struct die_info *parent)
17995 struct die_info *die;
17996 const gdb_byte *cur_ptr;
17999 cur_ptr = read_full_die_1 (reader, &die, info_ptr, &has_children, 0);
18002 *new_info_ptr = cur_ptr;
18005 store_in_ref_table (die, reader->cu);
18008 die->child = read_die_and_siblings_1 (reader, cur_ptr, new_info_ptr, die);
18012 *new_info_ptr = cur_ptr;
18015 die->sibling = NULL;
18016 die->parent = parent;
18020 /* Read a die, all of its descendents, and all of its siblings; set
18021 all of the fields of all of the dies correctly. Arguments are as
18022 in read_die_and_children. */
18024 static struct die_info *
18025 read_die_and_siblings_1 (const struct die_reader_specs *reader,
18026 const gdb_byte *info_ptr,
18027 const gdb_byte **new_info_ptr,
18028 struct die_info *parent)
18030 struct die_info *first_die, *last_sibling;
18031 const gdb_byte *cur_ptr;
18033 cur_ptr = info_ptr;
18034 first_die = last_sibling = NULL;
18038 struct die_info *die
18039 = read_die_and_children (reader, cur_ptr, &cur_ptr, parent);
18043 *new_info_ptr = cur_ptr;
18050 last_sibling->sibling = die;
18052 last_sibling = die;
18056 /* Read a die, all of its descendents, and all of its siblings; set
18057 all of the fields of all of the dies correctly. Arguments are as
18058 in read_die_and_children.
18059 This the main entry point for reading a DIE and all its children. */
18061 static struct die_info *
18062 read_die_and_siblings (const struct die_reader_specs *reader,
18063 const gdb_byte *info_ptr,
18064 const gdb_byte **new_info_ptr,
18065 struct die_info *parent)
18067 struct die_info *die = read_die_and_siblings_1 (reader, info_ptr,
18068 new_info_ptr, parent);
18070 if (dwarf_die_debug)
18072 fprintf_unfiltered (gdb_stdlog,
18073 "Read die from %s@0x%x of %s:\n",
18074 get_section_name (reader->die_section),
18075 (unsigned) (info_ptr - reader->die_section->buffer),
18076 bfd_get_filename (reader->abfd));
18077 dump_die (die, dwarf_die_debug);
18083 /* Read a die and all its attributes, leave space for NUM_EXTRA_ATTRS
18085 The caller is responsible for filling in the extra attributes
18086 and updating (*DIEP)->num_attrs.
18087 Set DIEP to point to a newly allocated die with its information,
18088 except for its child, sibling, and parent fields.
18089 Set HAS_CHILDREN to tell whether the die has children or not. */
18091 static const gdb_byte *
18092 read_full_die_1 (const struct die_reader_specs *reader,
18093 struct die_info **diep, const gdb_byte *info_ptr,
18094 int *has_children, int num_extra_attrs)
18096 unsigned int abbrev_number, bytes_read, i;
18097 struct abbrev_info *abbrev;
18098 struct die_info *die;
18099 struct dwarf2_cu *cu = reader->cu;
18100 bfd *abfd = reader->abfd;
18102 sect_offset sect_off = (sect_offset) (info_ptr - reader->buffer);
18103 abbrev_number = read_unsigned_leb128 (abfd, info_ptr, &bytes_read);
18104 info_ptr += bytes_read;
18105 if (!abbrev_number)
18112 abbrev = reader->abbrev_table->lookup_abbrev (abbrev_number);
18114 error (_("Dwarf Error: could not find abbrev number %d [in module %s]"),
18116 bfd_get_filename (abfd));
18118 die = dwarf_alloc_die (cu, abbrev->num_attrs + num_extra_attrs);
18119 die->sect_off = sect_off;
18120 die->tag = abbrev->tag;
18121 die->abbrev = abbrev_number;
18123 /* Make the result usable.
18124 The caller needs to update num_attrs after adding the extra
18126 die->num_attrs = abbrev->num_attrs;
18128 for (i = 0; i < abbrev->num_attrs; ++i)
18129 info_ptr = read_attribute (reader, &die->attrs[i], &abbrev->attrs[i],
18133 *has_children = abbrev->has_children;
18137 /* Read a die and all its attributes.
18138 Set DIEP to point to a newly allocated die with its information,
18139 except for its child, sibling, and parent fields.
18140 Set HAS_CHILDREN to tell whether the die has children or not. */
18142 static const gdb_byte *
18143 read_full_die (const struct die_reader_specs *reader,
18144 struct die_info **diep, const gdb_byte *info_ptr,
18147 const gdb_byte *result;
18149 result = read_full_die_1 (reader, diep, info_ptr, has_children, 0);
18151 if (dwarf_die_debug)
18153 fprintf_unfiltered (gdb_stdlog,
18154 "Read die from %s@0x%x of %s:\n",
18155 get_section_name (reader->die_section),
18156 (unsigned) (info_ptr - reader->die_section->buffer),
18157 bfd_get_filename (reader->abfd));
18158 dump_die (*diep, dwarf_die_debug);
18164 /* Abbreviation tables.
18166 In DWARF version 2, the description of the debugging information is
18167 stored in a separate .debug_abbrev section. Before we read any
18168 dies from a section we read in all abbreviations and install them
18169 in a hash table. */
18171 /* Allocate space for a struct abbrev_info object in ABBREV_TABLE. */
18173 struct abbrev_info *
18174 abbrev_table::alloc_abbrev ()
18176 struct abbrev_info *abbrev;
18178 abbrev = XOBNEW (&abbrev_obstack, struct abbrev_info);
18179 memset (abbrev, 0, sizeof (struct abbrev_info));
18184 /* Add an abbreviation to the table. */
18187 abbrev_table::add_abbrev (unsigned int abbrev_number,
18188 struct abbrev_info *abbrev)
18190 unsigned int hash_number;
18192 hash_number = abbrev_number % ABBREV_HASH_SIZE;
18193 abbrev->next = m_abbrevs[hash_number];
18194 m_abbrevs[hash_number] = abbrev;
18197 /* Look up an abbrev in the table.
18198 Returns NULL if the abbrev is not found. */
18200 struct abbrev_info *
18201 abbrev_table::lookup_abbrev (unsigned int abbrev_number)
18203 unsigned int hash_number;
18204 struct abbrev_info *abbrev;
18206 hash_number = abbrev_number % ABBREV_HASH_SIZE;
18207 abbrev = m_abbrevs[hash_number];
18211 if (abbrev->number == abbrev_number)
18213 abbrev = abbrev->next;
18218 /* Read in an abbrev table. */
18220 static abbrev_table_up
18221 abbrev_table_read_table (struct dwarf2_per_objfile *dwarf2_per_objfile,
18222 struct dwarf2_section_info *section,
18223 sect_offset sect_off)
18225 struct objfile *objfile = dwarf2_per_objfile->objfile;
18226 bfd *abfd = get_section_bfd_owner (section);
18227 const gdb_byte *abbrev_ptr;
18228 struct abbrev_info *cur_abbrev;
18229 unsigned int abbrev_number, bytes_read, abbrev_name;
18230 unsigned int abbrev_form;
18231 struct attr_abbrev *cur_attrs;
18232 unsigned int allocated_attrs;
18234 abbrev_table_up abbrev_table (new struct abbrev_table (sect_off));
18236 dwarf2_read_section (objfile, section);
18237 abbrev_ptr = section->buffer + to_underlying (sect_off);
18238 abbrev_number = read_unsigned_leb128 (abfd, abbrev_ptr, &bytes_read);
18239 abbrev_ptr += bytes_read;
18241 allocated_attrs = ATTR_ALLOC_CHUNK;
18242 cur_attrs = XNEWVEC (struct attr_abbrev, allocated_attrs);
18244 /* Loop until we reach an abbrev number of 0. */
18245 while (abbrev_number)
18247 cur_abbrev = abbrev_table->alloc_abbrev ();
18249 /* read in abbrev header */
18250 cur_abbrev->number = abbrev_number;
18252 = (enum dwarf_tag) read_unsigned_leb128 (abfd, abbrev_ptr, &bytes_read);
18253 abbrev_ptr += bytes_read;
18254 cur_abbrev->has_children = read_1_byte (abfd, abbrev_ptr);
18257 /* now read in declarations */
18260 LONGEST implicit_const;
18262 abbrev_name = read_unsigned_leb128 (abfd, abbrev_ptr, &bytes_read);
18263 abbrev_ptr += bytes_read;
18264 abbrev_form = read_unsigned_leb128 (abfd, abbrev_ptr, &bytes_read);
18265 abbrev_ptr += bytes_read;
18266 if (abbrev_form == DW_FORM_implicit_const)
18268 implicit_const = read_signed_leb128 (abfd, abbrev_ptr,
18270 abbrev_ptr += bytes_read;
18274 /* Initialize it due to a false compiler warning. */
18275 implicit_const = -1;
18278 if (abbrev_name == 0)
18281 if (cur_abbrev->num_attrs == allocated_attrs)
18283 allocated_attrs += ATTR_ALLOC_CHUNK;
18285 = XRESIZEVEC (struct attr_abbrev, cur_attrs, allocated_attrs);
18288 cur_attrs[cur_abbrev->num_attrs].name
18289 = (enum dwarf_attribute) abbrev_name;
18290 cur_attrs[cur_abbrev->num_attrs].form
18291 = (enum dwarf_form) abbrev_form;
18292 cur_attrs[cur_abbrev->num_attrs].implicit_const = implicit_const;
18293 ++cur_abbrev->num_attrs;
18296 cur_abbrev->attrs =
18297 XOBNEWVEC (&abbrev_table->abbrev_obstack, struct attr_abbrev,
18298 cur_abbrev->num_attrs);
18299 memcpy (cur_abbrev->attrs, cur_attrs,
18300 cur_abbrev->num_attrs * sizeof (struct attr_abbrev));
18302 abbrev_table->add_abbrev (abbrev_number, cur_abbrev);
18304 /* Get next abbreviation.
18305 Under Irix6 the abbreviations for a compilation unit are not
18306 always properly terminated with an abbrev number of 0.
18307 Exit loop if we encounter an abbreviation which we have
18308 already read (which means we are about to read the abbreviations
18309 for the next compile unit) or if the end of the abbreviation
18310 table is reached. */
18311 if ((unsigned int) (abbrev_ptr - section->buffer) >= section->size)
18313 abbrev_number = read_unsigned_leb128 (abfd, abbrev_ptr, &bytes_read);
18314 abbrev_ptr += bytes_read;
18315 if (abbrev_table->lookup_abbrev (abbrev_number) != NULL)
18320 return abbrev_table;
18323 /* Returns nonzero if TAG represents a type that we might generate a partial
18327 is_type_tag_for_partial (int tag)
18332 /* Some types that would be reasonable to generate partial symbols for,
18333 that we don't at present. */
18334 case DW_TAG_array_type:
18335 case DW_TAG_file_type:
18336 case DW_TAG_ptr_to_member_type:
18337 case DW_TAG_set_type:
18338 case DW_TAG_string_type:
18339 case DW_TAG_subroutine_type:
18341 case DW_TAG_base_type:
18342 case DW_TAG_class_type:
18343 case DW_TAG_interface_type:
18344 case DW_TAG_enumeration_type:
18345 case DW_TAG_structure_type:
18346 case DW_TAG_subrange_type:
18347 case DW_TAG_typedef:
18348 case DW_TAG_union_type:
18355 /* Load all DIEs that are interesting for partial symbols into memory. */
18357 static struct partial_die_info *
18358 load_partial_dies (const struct die_reader_specs *reader,
18359 const gdb_byte *info_ptr, int building_psymtab)
18361 struct dwarf2_cu *cu = reader->cu;
18362 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
18363 struct partial_die_info *parent_die, *last_die, *first_die = NULL;
18364 unsigned int bytes_read;
18365 unsigned int load_all = 0;
18366 int nesting_level = 1;
18371 gdb_assert (cu->per_cu != NULL);
18372 if (cu->per_cu->load_all_dies)
18376 = htab_create_alloc_ex (cu->header.length / 12,
18380 &cu->comp_unit_obstack,
18381 hashtab_obstack_allocate,
18382 dummy_obstack_deallocate);
18386 abbrev_info *abbrev = peek_die_abbrev (*reader, info_ptr, &bytes_read);
18388 /* A NULL abbrev means the end of a series of children. */
18389 if (abbrev == NULL)
18391 if (--nesting_level == 0)
18394 info_ptr += bytes_read;
18395 last_die = parent_die;
18396 parent_die = parent_die->die_parent;
18400 /* Check for template arguments. We never save these; if
18401 they're seen, we just mark the parent, and go on our way. */
18402 if (parent_die != NULL
18403 && cu->language == language_cplus
18404 && (abbrev->tag == DW_TAG_template_type_param
18405 || abbrev->tag == DW_TAG_template_value_param))
18407 parent_die->has_template_arguments = 1;
18411 /* We don't need a partial DIE for the template argument. */
18412 info_ptr = skip_one_die (reader, info_ptr + bytes_read, abbrev);
18417 /* We only recurse into c++ subprograms looking for template arguments.
18418 Skip their other children. */
18420 && cu->language == language_cplus
18421 && parent_die != NULL
18422 && parent_die->tag == DW_TAG_subprogram)
18424 info_ptr = skip_one_die (reader, info_ptr + bytes_read, abbrev);
18428 /* Check whether this DIE is interesting enough to save. Normally
18429 we would not be interested in members here, but there may be
18430 later variables referencing them via DW_AT_specification (for
18431 static members). */
18433 && !is_type_tag_for_partial (abbrev->tag)
18434 && abbrev->tag != DW_TAG_constant
18435 && abbrev->tag != DW_TAG_enumerator
18436 && abbrev->tag != DW_TAG_subprogram
18437 && abbrev->tag != DW_TAG_inlined_subroutine
18438 && abbrev->tag != DW_TAG_lexical_block
18439 && abbrev->tag != DW_TAG_variable
18440 && abbrev->tag != DW_TAG_namespace
18441 && abbrev->tag != DW_TAG_module
18442 && abbrev->tag != DW_TAG_member
18443 && abbrev->tag != DW_TAG_imported_unit
18444 && abbrev->tag != DW_TAG_imported_declaration)
18446 /* Otherwise we skip to the next sibling, if any. */
18447 info_ptr = skip_one_die (reader, info_ptr + bytes_read, abbrev);
18451 struct partial_die_info pdi ((sect_offset) (info_ptr - reader->buffer),
18454 info_ptr = pdi.read (reader, *abbrev, info_ptr + bytes_read);
18456 /* This two-pass algorithm for processing partial symbols has a
18457 high cost in cache pressure. Thus, handle some simple cases
18458 here which cover the majority of C partial symbols. DIEs
18459 which neither have specification tags in them, nor could have
18460 specification tags elsewhere pointing at them, can simply be
18461 processed and discarded.
18463 This segment is also optional; scan_partial_symbols and
18464 add_partial_symbol will handle these DIEs if we chain
18465 them in normally. When compilers which do not emit large
18466 quantities of duplicate debug information are more common,
18467 this code can probably be removed. */
18469 /* Any complete simple types at the top level (pretty much all
18470 of them, for a language without namespaces), can be processed
18472 if (parent_die == NULL
18473 && pdi.has_specification == 0
18474 && pdi.is_declaration == 0
18475 && ((pdi.tag == DW_TAG_typedef && !pdi.has_children)
18476 || pdi.tag == DW_TAG_base_type
18477 || pdi.tag == DW_TAG_subrange_type))
18479 if (building_psymtab && pdi.name != NULL)
18480 add_psymbol_to_list (pdi.name, strlen (pdi.name), 0,
18481 VAR_DOMAIN, LOC_TYPEDEF, -1,
18482 psymbol_placement::STATIC,
18483 0, cu->language, objfile);
18484 info_ptr = locate_pdi_sibling (reader, &pdi, info_ptr);
18488 /* The exception for DW_TAG_typedef with has_children above is
18489 a workaround of GCC PR debug/47510. In the case of this complaint
18490 type_name_or_error will error on such types later.
18492 GDB skipped children of DW_TAG_typedef by the shortcut above and then
18493 it could not find the child DIEs referenced later, this is checked
18494 above. In correct DWARF DW_TAG_typedef should have no children. */
18496 if (pdi.tag == DW_TAG_typedef && pdi.has_children)
18497 complaint (_("DW_TAG_typedef has childen - GCC PR debug/47510 bug "
18498 "- DIE at %s [in module %s]"),
18499 sect_offset_str (pdi.sect_off), objfile_name (objfile));
18501 /* If we're at the second level, and we're an enumerator, and
18502 our parent has no specification (meaning possibly lives in a
18503 namespace elsewhere), then we can add the partial symbol now
18504 instead of queueing it. */
18505 if (pdi.tag == DW_TAG_enumerator
18506 && parent_die != NULL
18507 && parent_die->die_parent == NULL
18508 && parent_die->tag == DW_TAG_enumeration_type
18509 && parent_die->has_specification == 0)
18511 if (pdi.name == NULL)
18512 complaint (_("malformed enumerator DIE ignored"));
18513 else if (building_psymtab)
18514 add_psymbol_to_list (pdi.name, strlen (pdi.name), 0,
18515 VAR_DOMAIN, LOC_CONST, -1,
18516 cu->language == language_cplus
18517 ? psymbol_placement::GLOBAL
18518 : psymbol_placement::STATIC,
18519 0, cu->language, objfile);
18521 info_ptr = locate_pdi_sibling (reader, &pdi, info_ptr);
18525 struct partial_die_info *part_die
18526 = new (&cu->comp_unit_obstack) partial_die_info (pdi);
18528 /* We'll save this DIE so link it in. */
18529 part_die->die_parent = parent_die;
18530 part_die->die_sibling = NULL;
18531 part_die->die_child = NULL;
18533 if (last_die && last_die == parent_die)
18534 last_die->die_child = part_die;
18536 last_die->die_sibling = part_die;
18538 last_die = part_die;
18540 if (first_die == NULL)
18541 first_die = part_die;
18543 /* Maybe add the DIE to the hash table. Not all DIEs that we
18544 find interesting need to be in the hash table, because we
18545 also have the parent/sibling/child chains; only those that we
18546 might refer to by offset later during partial symbol reading.
18548 For now this means things that might have be the target of a
18549 DW_AT_specification, DW_AT_abstract_origin, or
18550 DW_AT_extension. DW_AT_extension will refer only to
18551 namespaces; DW_AT_abstract_origin refers to functions (and
18552 many things under the function DIE, but we do not recurse
18553 into function DIEs during partial symbol reading) and
18554 possibly variables as well; DW_AT_specification refers to
18555 declarations. Declarations ought to have the DW_AT_declaration
18556 flag. It happens that GCC forgets to put it in sometimes, but
18557 only for functions, not for types.
18559 Adding more things than necessary to the hash table is harmless
18560 except for the performance cost. Adding too few will result in
18561 wasted time in find_partial_die, when we reread the compilation
18562 unit with load_all_dies set. */
18565 || abbrev->tag == DW_TAG_constant
18566 || abbrev->tag == DW_TAG_subprogram
18567 || abbrev->tag == DW_TAG_variable
18568 || abbrev->tag == DW_TAG_namespace
18569 || part_die->is_declaration)
18573 slot = htab_find_slot_with_hash (cu->partial_dies, part_die,
18574 to_underlying (part_die->sect_off),
18579 /* For some DIEs we want to follow their children (if any). For C
18580 we have no reason to follow the children of structures; for other
18581 languages we have to, so that we can get at method physnames
18582 to infer fully qualified class names, for DW_AT_specification,
18583 and for C++ template arguments. For C++, we also look one level
18584 inside functions to find template arguments (if the name of the
18585 function does not already contain the template arguments).
18587 For Ada, we need to scan the children of subprograms and lexical
18588 blocks as well because Ada allows the definition of nested
18589 entities that could be interesting for the debugger, such as
18590 nested subprograms for instance. */
18591 if (last_die->has_children
18593 || last_die->tag == DW_TAG_namespace
18594 || last_die->tag == DW_TAG_module
18595 || last_die->tag == DW_TAG_enumeration_type
18596 || (cu->language == language_cplus
18597 && last_die->tag == DW_TAG_subprogram
18598 && (last_die->name == NULL
18599 || strchr (last_die->name, '<') == NULL))
18600 || (cu->language != language_c
18601 && (last_die->tag == DW_TAG_class_type
18602 || last_die->tag == DW_TAG_interface_type
18603 || last_die->tag == DW_TAG_structure_type
18604 || last_die->tag == DW_TAG_union_type))
18605 || (cu->language == language_ada
18606 && (last_die->tag == DW_TAG_subprogram
18607 || last_die->tag == DW_TAG_lexical_block))))
18610 parent_die = last_die;
18614 /* Otherwise we skip to the next sibling, if any. */
18615 info_ptr = locate_pdi_sibling (reader, last_die, info_ptr);
18617 /* Back to the top, do it again. */
18621 partial_die_info::partial_die_info (sect_offset sect_off_,
18622 struct abbrev_info *abbrev)
18623 : partial_die_info (sect_off_, abbrev->tag, abbrev->has_children)
18627 /* Read a minimal amount of information into the minimal die structure.
18628 INFO_PTR should point just after the initial uleb128 of a DIE. */
18631 partial_die_info::read (const struct die_reader_specs *reader,
18632 const struct abbrev_info &abbrev, const gdb_byte *info_ptr)
18634 struct dwarf2_cu *cu = reader->cu;
18635 struct dwarf2_per_objfile *dwarf2_per_objfile
18636 = cu->per_cu->dwarf2_per_objfile;
18638 int has_low_pc_attr = 0;
18639 int has_high_pc_attr = 0;
18640 int high_pc_relative = 0;
18642 for (i = 0; i < abbrev.num_attrs; ++i)
18644 struct attribute attr;
18646 info_ptr = read_attribute (reader, &attr, &abbrev.attrs[i], info_ptr);
18648 /* Store the data if it is of an attribute we want to keep in a
18649 partial symbol table. */
18655 case DW_TAG_compile_unit:
18656 case DW_TAG_partial_unit:
18657 case DW_TAG_type_unit:
18658 /* Compilation units have a DW_AT_name that is a filename, not
18659 a source language identifier. */
18660 case DW_TAG_enumeration_type:
18661 case DW_TAG_enumerator:
18662 /* These tags always have simple identifiers already; no need
18663 to canonicalize them. */
18664 name = DW_STRING (&attr);
18668 struct objfile *objfile = dwarf2_per_objfile->objfile;
18671 = dwarf2_canonicalize_name (DW_STRING (&attr), cu,
18672 &objfile->per_bfd->storage_obstack);
18677 case DW_AT_linkage_name:
18678 case DW_AT_MIPS_linkage_name:
18679 /* Note that both forms of linkage name might appear. We
18680 assume they will be the same, and we only store the last
18682 if (cu->language == language_ada)
18683 name = DW_STRING (&attr);
18684 linkage_name = DW_STRING (&attr);
18687 has_low_pc_attr = 1;
18688 lowpc = attr_value_as_address (&attr);
18690 case DW_AT_high_pc:
18691 has_high_pc_attr = 1;
18692 highpc = attr_value_as_address (&attr);
18693 if (cu->header.version >= 4 && attr_form_is_constant (&attr))
18694 high_pc_relative = 1;
18696 case DW_AT_location:
18697 /* Support the .debug_loc offsets. */
18698 if (attr_form_is_block (&attr))
18700 d.locdesc = DW_BLOCK (&attr);
18702 else if (attr_form_is_section_offset (&attr))
18704 dwarf2_complex_location_expr_complaint ();
18708 dwarf2_invalid_attrib_class_complaint ("DW_AT_location",
18709 "partial symbol information");
18712 case DW_AT_external:
18713 is_external = DW_UNSND (&attr);
18715 case DW_AT_declaration:
18716 is_declaration = DW_UNSND (&attr);
18721 case DW_AT_abstract_origin:
18722 case DW_AT_specification:
18723 case DW_AT_extension:
18724 has_specification = 1;
18725 spec_offset = dwarf2_get_ref_die_offset (&attr);
18726 spec_is_dwz = (attr.form == DW_FORM_GNU_ref_alt
18727 || cu->per_cu->is_dwz);
18729 case DW_AT_sibling:
18730 /* Ignore absolute siblings, they might point outside of
18731 the current compile unit. */
18732 if (attr.form == DW_FORM_ref_addr)
18733 complaint (_("ignoring absolute DW_AT_sibling"));
18736 const gdb_byte *buffer = reader->buffer;
18737 sect_offset off = dwarf2_get_ref_die_offset (&attr);
18738 const gdb_byte *sibling_ptr = buffer + to_underlying (off);
18740 if (sibling_ptr < info_ptr)
18741 complaint (_("DW_AT_sibling points backwards"));
18742 else if (sibling_ptr > reader->buffer_end)
18743 dwarf2_section_buffer_overflow_complaint (reader->die_section);
18745 sibling = sibling_ptr;
18748 case DW_AT_byte_size:
18751 case DW_AT_const_value:
18752 has_const_value = 1;
18754 case DW_AT_calling_convention:
18755 /* DWARF doesn't provide a way to identify a program's source-level
18756 entry point. DW_AT_calling_convention attributes are only meant
18757 to describe functions' calling conventions.
18759 However, because it's a necessary piece of information in
18760 Fortran, and before DWARF 4 DW_CC_program was the only
18761 piece of debugging information whose definition refers to
18762 a 'main program' at all, several compilers marked Fortran
18763 main programs with DW_CC_program --- even when those
18764 functions use the standard calling conventions.
18766 Although DWARF now specifies a way to provide this
18767 information, we support this practice for backward
18769 if (DW_UNSND (&attr) == DW_CC_program
18770 && cu->language == language_fortran)
18771 main_subprogram = 1;
18774 if (DW_UNSND (&attr) == DW_INL_inlined
18775 || DW_UNSND (&attr) == DW_INL_declared_inlined)
18776 may_be_inlined = 1;
18780 if (tag == DW_TAG_imported_unit)
18782 d.sect_off = dwarf2_get_ref_die_offset (&attr);
18783 is_dwz = (attr.form == DW_FORM_GNU_ref_alt
18784 || cu->per_cu->is_dwz);
18788 case DW_AT_main_subprogram:
18789 main_subprogram = DW_UNSND (&attr);
18794 /* It would be nice to reuse dwarf2_get_pc_bounds here,
18795 but that requires a full DIE, so instead we just
18797 int need_ranges_base = tag != DW_TAG_compile_unit;
18798 unsigned int ranges_offset = (DW_UNSND (&attr)
18799 + (need_ranges_base
18803 /* Value of the DW_AT_ranges attribute is the offset in the
18804 .debug_ranges section. */
18805 if (dwarf2_ranges_read (ranges_offset, &lowpc, &highpc, cu,
18816 if (high_pc_relative)
18819 if (has_low_pc_attr && has_high_pc_attr)
18821 /* When using the GNU linker, .gnu.linkonce. sections are used to
18822 eliminate duplicate copies of functions and vtables and such.
18823 The linker will arbitrarily choose one and discard the others.
18824 The AT_*_pc values for such functions refer to local labels in
18825 these sections. If the section from that file was discarded, the
18826 labels are not in the output, so the relocs get a value of 0.
18827 If this is a discarded function, mark the pc bounds as invalid,
18828 so that GDB will ignore it. */
18829 if (lowpc == 0 && !dwarf2_per_objfile->has_section_at_zero)
18831 struct objfile *objfile = dwarf2_per_objfile->objfile;
18832 struct gdbarch *gdbarch = get_objfile_arch (objfile);
18834 complaint (_("DW_AT_low_pc %s is zero "
18835 "for DIE at %s [in module %s]"),
18836 paddress (gdbarch, lowpc),
18837 sect_offset_str (sect_off),
18838 objfile_name (objfile));
18840 /* dwarf2_get_pc_bounds has also the strict low < high requirement. */
18841 else if (lowpc >= highpc)
18843 struct objfile *objfile = dwarf2_per_objfile->objfile;
18844 struct gdbarch *gdbarch = get_objfile_arch (objfile);
18846 complaint (_("DW_AT_low_pc %s is not < DW_AT_high_pc %s "
18847 "for DIE at %s [in module %s]"),
18848 paddress (gdbarch, lowpc),
18849 paddress (gdbarch, highpc),
18850 sect_offset_str (sect_off),
18851 objfile_name (objfile));
18860 /* Find a cached partial DIE at OFFSET in CU. */
18862 struct partial_die_info *
18863 dwarf2_cu::find_partial_die (sect_offset sect_off)
18865 struct partial_die_info *lookup_die = NULL;
18866 struct partial_die_info part_die (sect_off);
18868 lookup_die = ((struct partial_die_info *)
18869 htab_find_with_hash (partial_dies, &part_die,
18870 to_underlying (sect_off)));
18875 /* Find a partial DIE at OFFSET, which may or may not be in CU,
18876 except in the case of .debug_types DIEs which do not reference
18877 outside their CU (they do however referencing other types via
18878 DW_FORM_ref_sig8). */
18880 static struct partial_die_info *
18881 find_partial_die (sect_offset sect_off, int offset_in_dwz, struct dwarf2_cu *cu)
18883 struct dwarf2_per_objfile *dwarf2_per_objfile
18884 = cu->per_cu->dwarf2_per_objfile;
18885 struct objfile *objfile = dwarf2_per_objfile->objfile;
18886 struct dwarf2_per_cu_data *per_cu = NULL;
18887 struct partial_die_info *pd = NULL;
18889 if (offset_in_dwz == cu->per_cu->is_dwz
18890 && offset_in_cu_p (&cu->header, sect_off))
18892 pd = cu->find_partial_die (sect_off);
18895 /* We missed recording what we needed.
18896 Load all dies and try again. */
18897 per_cu = cu->per_cu;
18901 /* TUs don't reference other CUs/TUs (except via type signatures). */
18902 if (cu->per_cu->is_debug_types)
18904 error (_("Dwarf Error: Type Unit at offset %s contains"
18905 " external reference to offset %s [in module %s].\n"),
18906 sect_offset_str (cu->header.sect_off), sect_offset_str (sect_off),
18907 bfd_get_filename (objfile->obfd));
18909 per_cu = dwarf2_find_containing_comp_unit (sect_off, offset_in_dwz,
18910 dwarf2_per_objfile);
18912 if (per_cu->cu == NULL || per_cu->cu->partial_dies == NULL)
18913 load_partial_comp_unit (per_cu);
18915 per_cu->cu->last_used = 0;
18916 pd = per_cu->cu->find_partial_die (sect_off);
18919 /* If we didn't find it, and not all dies have been loaded,
18920 load them all and try again. */
18922 if (pd == NULL && per_cu->load_all_dies == 0)
18924 per_cu->load_all_dies = 1;
18926 /* This is nasty. When we reread the DIEs, somewhere up the call chain
18927 THIS_CU->cu may already be in use. So we can't just free it and
18928 replace its DIEs with the ones we read in. Instead, we leave those
18929 DIEs alone (which can still be in use, e.g. in scan_partial_symbols),
18930 and clobber THIS_CU->cu->partial_dies with the hash table for the new
18932 load_partial_comp_unit (per_cu);
18934 pd = per_cu->cu->find_partial_die (sect_off);
18938 internal_error (__FILE__, __LINE__,
18939 _("could not find partial DIE %s "
18940 "in cache [from module %s]\n"),
18941 sect_offset_str (sect_off), bfd_get_filename (objfile->obfd));
18945 /* See if we can figure out if the class lives in a namespace. We do
18946 this by looking for a member function; its demangled name will
18947 contain namespace info, if there is any. */
18950 guess_partial_die_structure_name (struct partial_die_info *struct_pdi,
18951 struct dwarf2_cu *cu)
18953 /* NOTE: carlton/2003-10-07: Getting the info this way changes
18954 what template types look like, because the demangler
18955 frequently doesn't give the same name as the debug info. We
18956 could fix this by only using the demangled name to get the
18957 prefix (but see comment in read_structure_type). */
18959 struct partial_die_info *real_pdi;
18960 struct partial_die_info *child_pdi;
18962 /* If this DIE (this DIE's specification, if any) has a parent, then
18963 we should not do this. We'll prepend the parent's fully qualified
18964 name when we create the partial symbol. */
18966 real_pdi = struct_pdi;
18967 while (real_pdi->has_specification)
18968 real_pdi = find_partial_die (real_pdi->spec_offset,
18969 real_pdi->spec_is_dwz, cu);
18971 if (real_pdi->die_parent != NULL)
18974 for (child_pdi = struct_pdi->die_child;
18976 child_pdi = child_pdi->die_sibling)
18978 if (child_pdi->tag == DW_TAG_subprogram
18979 && child_pdi->linkage_name != NULL)
18981 char *actual_class_name
18982 = language_class_name_from_physname (cu->language_defn,
18983 child_pdi->linkage_name);
18984 if (actual_class_name != NULL)
18986 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
18989 obstack_copy0 (&objfile->per_bfd->storage_obstack,
18991 strlen (actual_class_name)));
18992 xfree (actual_class_name);
19000 partial_die_info::fixup (struct dwarf2_cu *cu)
19002 /* Once we've fixed up a die, there's no point in doing so again.
19003 This also avoids a memory leak if we were to call
19004 guess_partial_die_structure_name multiple times. */
19008 /* If we found a reference attribute and the DIE has no name, try
19009 to find a name in the referred to DIE. */
19011 if (name == NULL && has_specification)
19013 struct partial_die_info *spec_die;
19015 spec_die = find_partial_die (spec_offset, spec_is_dwz, cu);
19017 spec_die->fixup (cu);
19019 if (spec_die->name)
19021 name = spec_die->name;
19023 /* Copy DW_AT_external attribute if it is set. */
19024 if (spec_die->is_external)
19025 is_external = spec_die->is_external;
19029 /* Set default names for some unnamed DIEs. */
19031 if (name == NULL && tag == DW_TAG_namespace)
19032 name = CP_ANONYMOUS_NAMESPACE_STR;
19034 /* If there is no parent die to provide a namespace, and there are
19035 children, see if we can determine the namespace from their linkage
19037 if (cu->language == language_cplus
19038 && !VEC_empty (dwarf2_section_info_def,
19039 cu->per_cu->dwarf2_per_objfile->types)
19040 && die_parent == NULL
19042 && (tag == DW_TAG_class_type
19043 || tag == DW_TAG_structure_type
19044 || tag == DW_TAG_union_type))
19045 guess_partial_die_structure_name (this, cu);
19047 /* GCC might emit a nameless struct or union that has a linkage
19048 name. See http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47510. */
19050 && (tag == DW_TAG_class_type
19051 || tag == DW_TAG_interface_type
19052 || tag == DW_TAG_structure_type
19053 || tag == DW_TAG_union_type)
19054 && linkage_name != NULL)
19058 demangled = gdb_demangle (linkage_name, DMGL_TYPES);
19063 /* Strip any leading namespaces/classes, keep only the base name.
19064 DW_AT_name for named DIEs does not contain the prefixes. */
19065 base = strrchr (demangled, ':');
19066 if (base && base > demangled && base[-1] == ':')
19071 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
19074 obstack_copy0 (&objfile->per_bfd->storage_obstack,
19075 base, strlen (base)));
19083 /* Read an attribute value described by an attribute form. */
19085 static const gdb_byte *
19086 read_attribute_value (const struct die_reader_specs *reader,
19087 struct attribute *attr, unsigned form,
19088 LONGEST implicit_const, const gdb_byte *info_ptr)
19090 struct dwarf2_cu *cu = reader->cu;
19091 struct dwarf2_per_objfile *dwarf2_per_objfile
19092 = cu->per_cu->dwarf2_per_objfile;
19093 struct objfile *objfile = dwarf2_per_objfile->objfile;
19094 struct gdbarch *gdbarch = get_objfile_arch (objfile);
19095 bfd *abfd = reader->abfd;
19096 struct comp_unit_head *cu_header = &cu->header;
19097 unsigned int bytes_read;
19098 struct dwarf_block *blk;
19100 attr->form = (enum dwarf_form) form;
19103 case DW_FORM_ref_addr:
19104 if (cu->header.version == 2)
19105 DW_UNSND (attr) = read_address (abfd, info_ptr, cu, &bytes_read);
19107 DW_UNSND (attr) = read_offset (abfd, info_ptr,
19108 &cu->header, &bytes_read);
19109 info_ptr += bytes_read;
19111 case DW_FORM_GNU_ref_alt:
19112 DW_UNSND (attr) = read_offset (abfd, info_ptr, &cu->header, &bytes_read);
19113 info_ptr += bytes_read;
19116 DW_ADDR (attr) = read_address (abfd, info_ptr, cu, &bytes_read);
19117 DW_ADDR (attr) = gdbarch_adjust_dwarf2_addr (gdbarch, DW_ADDR (attr));
19118 info_ptr += bytes_read;
19120 case DW_FORM_block2:
19121 blk = dwarf_alloc_block (cu);
19122 blk->size = read_2_bytes (abfd, info_ptr);
19124 blk->data = read_n_bytes (abfd, info_ptr, blk->size);
19125 info_ptr += blk->size;
19126 DW_BLOCK (attr) = blk;
19128 case DW_FORM_block4:
19129 blk = dwarf_alloc_block (cu);
19130 blk->size = read_4_bytes (abfd, info_ptr);
19132 blk->data = read_n_bytes (abfd, info_ptr, blk->size);
19133 info_ptr += blk->size;
19134 DW_BLOCK (attr) = blk;
19136 case DW_FORM_data2:
19137 DW_UNSND (attr) = read_2_bytes (abfd, info_ptr);
19140 case DW_FORM_data4:
19141 DW_UNSND (attr) = read_4_bytes (abfd, info_ptr);
19144 case DW_FORM_data8:
19145 DW_UNSND (attr) = read_8_bytes (abfd, info_ptr);
19148 case DW_FORM_data16:
19149 blk = dwarf_alloc_block (cu);
19151 blk->data = read_n_bytes (abfd, info_ptr, 16);
19153 DW_BLOCK (attr) = blk;
19155 case DW_FORM_sec_offset:
19156 DW_UNSND (attr) = read_offset (abfd, info_ptr, &cu->header, &bytes_read);
19157 info_ptr += bytes_read;
19159 case DW_FORM_string:
19160 DW_STRING (attr) = read_direct_string (abfd, info_ptr, &bytes_read);
19161 DW_STRING_IS_CANONICAL (attr) = 0;
19162 info_ptr += bytes_read;
19165 if (!cu->per_cu->is_dwz)
19167 DW_STRING (attr) = read_indirect_string (dwarf2_per_objfile,
19168 abfd, info_ptr, cu_header,
19170 DW_STRING_IS_CANONICAL (attr) = 0;
19171 info_ptr += bytes_read;
19175 case DW_FORM_line_strp:
19176 if (!cu->per_cu->is_dwz)
19178 DW_STRING (attr) = read_indirect_line_string (dwarf2_per_objfile,
19180 cu_header, &bytes_read);
19181 DW_STRING_IS_CANONICAL (attr) = 0;
19182 info_ptr += bytes_read;
19186 case DW_FORM_GNU_strp_alt:
19188 struct dwz_file *dwz = dwarf2_get_dwz_file (dwarf2_per_objfile);
19189 LONGEST str_offset = read_offset (abfd, info_ptr, cu_header,
19192 DW_STRING (attr) = read_indirect_string_from_dwz (objfile,
19194 DW_STRING_IS_CANONICAL (attr) = 0;
19195 info_ptr += bytes_read;
19198 case DW_FORM_exprloc:
19199 case DW_FORM_block:
19200 blk = dwarf_alloc_block (cu);
19201 blk->size = read_unsigned_leb128 (abfd, info_ptr, &bytes_read);
19202 info_ptr += bytes_read;
19203 blk->data = read_n_bytes (abfd, info_ptr, blk->size);
19204 info_ptr += blk->size;
19205 DW_BLOCK (attr) = blk;
19207 case DW_FORM_block1:
19208 blk = dwarf_alloc_block (cu);
19209 blk->size = read_1_byte (abfd, info_ptr);
19211 blk->data = read_n_bytes (abfd, info_ptr, blk->size);
19212 info_ptr += blk->size;
19213 DW_BLOCK (attr) = blk;
19215 case DW_FORM_data1:
19216 DW_UNSND (attr) = read_1_byte (abfd, info_ptr);
19220 DW_UNSND (attr) = read_1_byte (abfd, info_ptr);
19223 case DW_FORM_flag_present:
19224 DW_UNSND (attr) = 1;
19226 case DW_FORM_sdata:
19227 DW_SND (attr) = read_signed_leb128 (abfd, info_ptr, &bytes_read);
19228 info_ptr += bytes_read;
19230 case DW_FORM_udata:
19231 DW_UNSND (attr) = read_unsigned_leb128 (abfd, info_ptr, &bytes_read);
19232 info_ptr += bytes_read;
19235 DW_UNSND (attr) = (to_underlying (cu->header.sect_off)
19236 + read_1_byte (abfd, info_ptr));
19240 DW_UNSND (attr) = (to_underlying (cu->header.sect_off)
19241 + read_2_bytes (abfd, info_ptr));
19245 DW_UNSND (attr) = (to_underlying (cu->header.sect_off)
19246 + read_4_bytes (abfd, info_ptr));
19250 DW_UNSND (attr) = (to_underlying (cu->header.sect_off)
19251 + read_8_bytes (abfd, info_ptr));
19254 case DW_FORM_ref_sig8:
19255 DW_SIGNATURE (attr) = read_8_bytes (abfd, info_ptr);
19258 case DW_FORM_ref_udata:
19259 DW_UNSND (attr) = (to_underlying (cu->header.sect_off)
19260 + read_unsigned_leb128 (abfd, info_ptr, &bytes_read));
19261 info_ptr += bytes_read;
19263 case DW_FORM_indirect:
19264 form = read_unsigned_leb128 (abfd, info_ptr, &bytes_read);
19265 info_ptr += bytes_read;
19266 if (form == DW_FORM_implicit_const)
19268 implicit_const = read_signed_leb128 (abfd, info_ptr, &bytes_read);
19269 info_ptr += bytes_read;
19271 info_ptr = read_attribute_value (reader, attr, form, implicit_const,
19274 case DW_FORM_implicit_const:
19275 DW_SND (attr) = implicit_const;
19277 case DW_FORM_addrx:
19278 case DW_FORM_GNU_addr_index:
19279 if (reader->dwo_file == NULL)
19281 /* For now flag a hard error.
19282 Later we can turn this into a complaint. */
19283 error (_("Dwarf Error: %s found in non-DWO CU [in module %s]"),
19284 dwarf_form_name (form),
19285 bfd_get_filename (abfd));
19287 DW_ADDR (attr) = read_addr_index_from_leb128 (cu, info_ptr, &bytes_read);
19288 info_ptr += bytes_read;
19290 case DW_FORM_GNU_str_index:
19291 if (reader->dwo_file == NULL)
19293 /* For now flag a hard error.
19294 Later we can turn this into a complaint if warranted. */
19295 error (_("Dwarf Error: %s found in non-DWO CU [in module %s]"),
19296 dwarf_form_name (form),
19297 bfd_get_filename (abfd));
19300 ULONGEST str_index =
19301 read_unsigned_leb128 (abfd, info_ptr, &bytes_read);
19303 DW_STRING (attr) = read_str_index (reader, str_index);
19304 DW_STRING_IS_CANONICAL (attr) = 0;
19305 info_ptr += bytes_read;
19309 error (_("Dwarf Error: Cannot handle %s in DWARF reader [in module %s]"),
19310 dwarf_form_name (form),
19311 bfd_get_filename (abfd));
19315 if (cu->per_cu->is_dwz && attr_form_is_ref (attr))
19316 attr->form = DW_FORM_GNU_ref_alt;
19318 /* We have seen instances where the compiler tried to emit a byte
19319 size attribute of -1 which ended up being encoded as an unsigned
19320 0xffffffff. Although 0xffffffff is technically a valid size value,
19321 an object of this size seems pretty unlikely so we can relatively
19322 safely treat these cases as if the size attribute was invalid and
19323 treat them as zero by default. */
19324 if (attr->name == DW_AT_byte_size
19325 && form == DW_FORM_data4
19326 && DW_UNSND (attr) >= 0xffffffff)
19329 (_("Suspicious DW_AT_byte_size value treated as zero instead of %s"),
19330 hex_string (DW_UNSND (attr)));
19331 DW_UNSND (attr) = 0;
19337 /* Read an attribute described by an abbreviated attribute. */
19339 static const gdb_byte *
19340 read_attribute (const struct die_reader_specs *reader,
19341 struct attribute *attr, struct attr_abbrev *abbrev,
19342 const gdb_byte *info_ptr)
19344 attr->name = abbrev->name;
19345 return read_attribute_value (reader, attr, abbrev->form,
19346 abbrev->implicit_const, info_ptr);
19349 /* Read dwarf information from a buffer. */
19351 static unsigned int
19352 read_1_byte (bfd *abfd, const gdb_byte *buf)
19354 return bfd_get_8 (abfd, buf);
19358 read_1_signed_byte (bfd *abfd, const gdb_byte *buf)
19360 return bfd_get_signed_8 (abfd, buf);
19363 static unsigned int
19364 read_2_bytes (bfd *abfd, const gdb_byte *buf)
19366 return bfd_get_16 (abfd, buf);
19370 read_2_signed_bytes (bfd *abfd, const gdb_byte *buf)
19372 return bfd_get_signed_16 (abfd, buf);
19375 static unsigned int
19376 read_4_bytes (bfd *abfd, const gdb_byte *buf)
19378 return bfd_get_32 (abfd, buf);
19382 read_4_signed_bytes (bfd *abfd, const gdb_byte *buf)
19384 return bfd_get_signed_32 (abfd, buf);
19388 read_8_bytes (bfd *abfd, const gdb_byte *buf)
19390 return bfd_get_64 (abfd, buf);
19394 read_address (bfd *abfd, const gdb_byte *buf, struct dwarf2_cu *cu,
19395 unsigned int *bytes_read)
19397 struct comp_unit_head *cu_header = &cu->header;
19398 CORE_ADDR retval = 0;
19400 if (cu_header->signed_addr_p)
19402 switch (cu_header->addr_size)
19405 retval = bfd_get_signed_16 (abfd, buf);
19408 retval = bfd_get_signed_32 (abfd, buf);
19411 retval = bfd_get_signed_64 (abfd, buf);
19414 internal_error (__FILE__, __LINE__,
19415 _("read_address: bad switch, signed [in module %s]"),
19416 bfd_get_filename (abfd));
19421 switch (cu_header->addr_size)
19424 retval = bfd_get_16 (abfd, buf);
19427 retval = bfd_get_32 (abfd, buf);
19430 retval = bfd_get_64 (abfd, buf);
19433 internal_error (__FILE__, __LINE__,
19434 _("read_address: bad switch, "
19435 "unsigned [in module %s]"),
19436 bfd_get_filename (abfd));
19440 *bytes_read = cu_header->addr_size;
19444 /* Read the initial length from a section. The (draft) DWARF 3
19445 specification allows the initial length to take up either 4 bytes
19446 or 12 bytes. If the first 4 bytes are 0xffffffff, then the next 8
19447 bytes describe the length and all offsets will be 8 bytes in length
19450 An older, non-standard 64-bit format is also handled by this
19451 function. The older format in question stores the initial length
19452 as an 8-byte quantity without an escape value. Lengths greater
19453 than 2^32 aren't very common which means that the initial 4 bytes
19454 is almost always zero. Since a length value of zero doesn't make
19455 sense for the 32-bit format, this initial zero can be considered to
19456 be an escape value which indicates the presence of the older 64-bit
19457 format. As written, the code can't detect (old format) lengths
19458 greater than 4GB. If it becomes necessary to handle lengths
19459 somewhat larger than 4GB, we could allow other small values (such
19460 as the non-sensical values of 1, 2, and 3) to also be used as
19461 escape values indicating the presence of the old format.
19463 The value returned via bytes_read should be used to increment the
19464 relevant pointer after calling read_initial_length().
19466 [ Note: read_initial_length() and read_offset() are based on the
19467 document entitled "DWARF Debugging Information Format", revision
19468 3, draft 8, dated November 19, 2001. This document was obtained
19471 http://reality.sgiweb.org/davea/dwarf3-draft8-011125.pdf
19473 This document is only a draft and is subject to change. (So beware.)
19475 Details regarding the older, non-standard 64-bit format were
19476 determined empirically by examining 64-bit ELF files produced by
19477 the SGI toolchain on an IRIX 6.5 machine.
19479 - Kevin, July 16, 2002
19483 read_initial_length (bfd *abfd, const gdb_byte *buf, unsigned int *bytes_read)
19485 LONGEST length = bfd_get_32 (abfd, buf);
19487 if (length == 0xffffffff)
19489 length = bfd_get_64 (abfd, buf + 4);
19492 else if (length == 0)
19494 /* Handle the (non-standard) 64-bit DWARF2 format used by IRIX. */
19495 length = bfd_get_64 (abfd, buf);
19506 /* Cover function for read_initial_length.
19507 Returns the length of the object at BUF, and stores the size of the
19508 initial length in *BYTES_READ and stores the size that offsets will be in
19510 If the initial length size is not equivalent to that specified in
19511 CU_HEADER then issue a complaint.
19512 This is useful when reading non-comp-unit headers. */
19515 read_checked_initial_length_and_offset (bfd *abfd, const gdb_byte *buf,
19516 const struct comp_unit_head *cu_header,
19517 unsigned int *bytes_read,
19518 unsigned int *offset_size)
19520 LONGEST length = read_initial_length (abfd, buf, bytes_read);
19522 gdb_assert (cu_header->initial_length_size == 4
19523 || cu_header->initial_length_size == 8
19524 || cu_header->initial_length_size == 12);
19526 if (cu_header->initial_length_size != *bytes_read)
19527 complaint (_("intermixed 32-bit and 64-bit DWARF sections"));
19529 *offset_size = (*bytes_read == 4) ? 4 : 8;
19533 /* Read an offset from the data stream. The size of the offset is
19534 given by cu_header->offset_size. */
19537 read_offset (bfd *abfd, const gdb_byte *buf,
19538 const struct comp_unit_head *cu_header,
19539 unsigned int *bytes_read)
19541 LONGEST offset = read_offset_1 (abfd, buf, cu_header->offset_size);
19543 *bytes_read = cu_header->offset_size;
19547 /* Read an offset from the data stream. */
19550 read_offset_1 (bfd *abfd, const gdb_byte *buf, unsigned int offset_size)
19552 LONGEST retval = 0;
19554 switch (offset_size)
19557 retval = bfd_get_32 (abfd, buf);
19560 retval = bfd_get_64 (abfd, buf);
19563 internal_error (__FILE__, __LINE__,
19564 _("read_offset_1: bad switch [in module %s]"),
19565 bfd_get_filename (abfd));
19571 static const gdb_byte *
19572 read_n_bytes (bfd *abfd, const gdb_byte *buf, unsigned int size)
19574 /* If the size of a host char is 8 bits, we can return a pointer
19575 to the buffer, otherwise we have to copy the data to a buffer
19576 allocated on the temporary obstack. */
19577 gdb_assert (HOST_CHAR_BIT == 8);
19581 static const char *
19582 read_direct_string (bfd *abfd, const gdb_byte *buf,
19583 unsigned int *bytes_read_ptr)
19585 /* If the size of a host char is 8 bits, we can return a pointer
19586 to the string, otherwise we have to copy the string to a buffer
19587 allocated on the temporary obstack. */
19588 gdb_assert (HOST_CHAR_BIT == 8);
19591 *bytes_read_ptr = 1;
19594 *bytes_read_ptr = strlen ((const char *) buf) + 1;
19595 return (const char *) buf;
19598 /* Return pointer to string at section SECT offset STR_OFFSET with error
19599 reporting strings FORM_NAME and SECT_NAME. */
19601 static const char *
19602 read_indirect_string_at_offset_from (struct objfile *objfile,
19603 bfd *abfd, LONGEST str_offset,
19604 struct dwarf2_section_info *sect,
19605 const char *form_name,
19606 const char *sect_name)
19608 dwarf2_read_section (objfile, sect);
19609 if (sect->buffer == NULL)
19610 error (_("%s used without %s section [in module %s]"),
19611 form_name, sect_name, bfd_get_filename (abfd));
19612 if (str_offset >= sect->size)
19613 error (_("%s pointing outside of %s section [in module %s]"),
19614 form_name, sect_name, bfd_get_filename (abfd));
19615 gdb_assert (HOST_CHAR_BIT == 8);
19616 if (sect->buffer[str_offset] == '\0')
19618 return (const char *) (sect->buffer + str_offset);
19621 /* Return pointer to string at .debug_str offset STR_OFFSET. */
19623 static const char *
19624 read_indirect_string_at_offset (struct dwarf2_per_objfile *dwarf2_per_objfile,
19625 bfd *abfd, LONGEST str_offset)
19627 return read_indirect_string_at_offset_from (dwarf2_per_objfile->objfile,
19629 &dwarf2_per_objfile->str,
19630 "DW_FORM_strp", ".debug_str");
19633 /* Return pointer to string at .debug_line_str offset STR_OFFSET. */
19635 static const char *
19636 read_indirect_line_string_at_offset (struct dwarf2_per_objfile *dwarf2_per_objfile,
19637 bfd *abfd, LONGEST str_offset)
19639 return read_indirect_string_at_offset_from (dwarf2_per_objfile->objfile,
19641 &dwarf2_per_objfile->line_str,
19642 "DW_FORM_line_strp",
19643 ".debug_line_str");
19646 /* Read a string at offset STR_OFFSET in the .debug_str section from
19647 the .dwz file DWZ. Throw an error if the offset is too large. If
19648 the string consists of a single NUL byte, return NULL; otherwise
19649 return a pointer to the string. */
19651 static const char *
19652 read_indirect_string_from_dwz (struct objfile *objfile, struct dwz_file *dwz,
19653 LONGEST str_offset)
19655 dwarf2_read_section (objfile, &dwz->str);
19657 if (dwz->str.buffer == NULL)
19658 error (_("DW_FORM_GNU_strp_alt used without .debug_str "
19659 "section [in module %s]"),
19660 bfd_get_filename (dwz->dwz_bfd));
19661 if (str_offset >= dwz->str.size)
19662 error (_("DW_FORM_GNU_strp_alt pointing outside of "
19663 ".debug_str section [in module %s]"),
19664 bfd_get_filename (dwz->dwz_bfd));
19665 gdb_assert (HOST_CHAR_BIT == 8);
19666 if (dwz->str.buffer[str_offset] == '\0')
19668 return (const char *) (dwz->str.buffer + str_offset);
19671 /* Return pointer to string at .debug_str offset as read from BUF.
19672 BUF is assumed to be in a compilation unit described by CU_HEADER.
19673 Return *BYTES_READ_PTR count of bytes read from BUF. */
19675 static const char *
19676 read_indirect_string (struct dwarf2_per_objfile *dwarf2_per_objfile, bfd *abfd,
19677 const gdb_byte *buf,
19678 const struct comp_unit_head *cu_header,
19679 unsigned int *bytes_read_ptr)
19681 LONGEST str_offset = read_offset (abfd, buf, cu_header, bytes_read_ptr);
19683 return read_indirect_string_at_offset (dwarf2_per_objfile, abfd, str_offset);
19686 /* Return pointer to string at .debug_line_str offset as read from BUF.
19687 BUF is assumed to be in a compilation unit described by CU_HEADER.
19688 Return *BYTES_READ_PTR count of bytes read from BUF. */
19690 static const char *
19691 read_indirect_line_string (struct dwarf2_per_objfile *dwarf2_per_objfile,
19692 bfd *abfd, const gdb_byte *buf,
19693 const struct comp_unit_head *cu_header,
19694 unsigned int *bytes_read_ptr)
19696 LONGEST str_offset = read_offset (abfd, buf, cu_header, bytes_read_ptr);
19698 return read_indirect_line_string_at_offset (dwarf2_per_objfile, abfd,
19703 read_unsigned_leb128 (bfd *abfd, const gdb_byte *buf,
19704 unsigned int *bytes_read_ptr)
19707 unsigned int num_read;
19709 unsigned char byte;
19716 byte = bfd_get_8 (abfd, buf);
19719 result |= ((ULONGEST) (byte & 127) << shift);
19720 if ((byte & 128) == 0)
19726 *bytes_read_ptr = num_read;
19731 read_signed_leb128 (bfd *abfd, const gdb_byte *buf,
19732 unsigned int *bytes_read_ptr)
19735 int shift, num_read;
19736 unsigned char byte;
19743 byte = bfd_get_8 (abfd, buf);
19746 result |= ((ULONGEST) (byte & 127) << shift);
19748 if ((byte & 128) == 0)
19753 if ((shift < 8 * sizeof (result)) && (byte & 0x40))
19754 result |= -(((ULONGEST) 1) << shift);
19755 *bytes_read_ptr = num_read;
19759 /* Given index ADDR_INDEX in .debug_addr, fetch the value.
19760 ADDR_BASE is the DW_AT_GNU_addr_base attribute or zero.
19761 ADDR_SIZE is the size of addresses from the CU header. */
19764 read_addr_index_1 (struct dwarf2_per_objfile *dwarf2_per_objfile,
19765 unsigned int addr_index, ULONGEST addr_base, int addr_size)
19767 struct objfile *objfile = dwarf2_per_objfile->objfile;
19768 bfd *abfd = objfile->obfd;
19769 const gdb_byte *info_ptr;
19771 dwarf2_read_section (objfile, &dwarf2_per_objfile->addr);
19772 if (dwarf2_per_objfile->addr.buffer == NULL)
19773 error (_("DW_FORM_addr_index used without .debug_addr section [in module %s]"),
19774 objfile_name (objfile));
19775 if (addr_base + addr_index * addr_size >= dwarf2_per_objfile->addr.size)
19776 error (_("DW_FORM_addr_index pointing outside of "
19777 ".debug_addr section [in module %s]"),
19778 objfile_name (objfile));
19779 info_ptr = (dwarf2_per_objfile->addr.buffer
19780 + addr_base + addr_index * addr_size);
19781 if (addr_size == 4)
19782 return bfd_get_32 (abfd, info_ptr);
19784 return bfd_get_64 (abfd, info_ptr);
19787 /* Given index ADDR_INDEX in .debug_addr, fetch the value. */
19790 read_addr_index (struct dwarf2_cu *cu, unsigned int addr_index)
19792 return read_addr_index_1 (cu->per_cu->dwarf2_per_objfile, addr_index,
19793 cu->addr_base, cu->header.addr_size);
19796 /* Given a pointer to an leb128 value, fetch the value from .debug_addr. */
19799 read_addr_index_from_leb128 (struct dwarf2_cu *cu, const gdb_byte *info_ptr,
19800 unsigned int *bytes_read)
19802 bfd *abfd = cu->per_cu->dwarf2_per_objfile->objfile->obfd;
19803 unsigned int addr_index = read_unsigned_leb128 (abfd, info_ptr, bytes_read);
19805 return read_addr_index (cu, addr_index);
19808 /* Data structure to pass results from dwarf2_read_addr_index_reader
19809 back to dwarf2_read_addr_index. */
19811 struct dwarf2_read_addr_index_data
19813 ULONGEST addr_base;
19817 /* die_reader_func for dwarf2_read_addr_index. */
19820 dwarf2_read_addr_index_reader (const struct die_reader_specs *reader,
19821 const gdb_byte *info_ptr,
19822 struct die_info *comp_unit_die,
19826 struct dwarf2_cu *cu = reader->cu;
19827 struct dwarf2_read_addr_index_data *aidata =
19828 (struct dwarf2_read_addr_index_data *) data;
19830 aidata->addr_base = cu->addr_base;
19831 aidata->addr_size = cu->header.addr_size;
19834 /* Given an index in .debug_addr, fetch the value.
19835 NOTE: This can be called during dwarf expression evaluation,
19836 long after the debug information has been read, and thus per_cu->cu
19837 may no longer exist. */
19840 dwarf2_read_addr_index (struct dwarf2_per_cu_data *per_cu,
19841 unsigned int addr_index)
19843 struct dwarf2_per_objfile *dwarf2_per_objfile = per_cu->dwarf2_per_objfile;
19844 struct dwarf2_cu *cu = per_cu->cu;
19845 ULONGEST addr_base;
19848 /* We need addr_base and addr_size.
19849 If we don't have PER_CU->cu, we have to get it.
19850 Nasty, but the alternative is storing the needed info in PER_CU,
19851 which at this point doesn't seem justified: it's not clear how frequently
19852 it would get used and it would increase the size of every PER_CU.
19853 Entry points like dwarf2_per_cu_addr_size do a similar thing
19854 so we're not in uncharted territory here.
19855 Alas we need to be a bit more complicated as addr_base is contained
19858 We don't need to read the entire CU(/TU).
19859 We just need the header and top level die.
19861 IWBN to use the aging mechanism to let us lazily later discard the CU.
19862 For now we skip this optimization. */
19866 addr_base = cu->addr_base;
19867 addr_size = cu->header.addr_size;
19871 struct dwarf2_read_addr_index_data aidata;
19873 /* Note: We can't use init_cutu_and_read_dies_simple here,
19874 we need addr_base. */
19875 init_cutu_and_read_dies (per_cu, NULL, 0, 0, false,
19876 dwarf2_read_addr_index_reader, &aidata);
19877 addr_base = aidata.addr_base;
19878 addr_size = aidata.addr_size;
19881 return read_addr_index_1 (dwarf2_per_objfile, addr_index, addr_base,
19885 /* Given a DW_FORM_GNU_str_index, fetch the string.
19886 This is only used by the Fission support. */
19888 static const char *
19889 read_str_index (const struct die_reader_specs *reader, ULONGEST str_index)
19891 struct dwarf2_cu *cu = reader->cu;
19892 struct dwarf2_per_objfile *dwarf2_per_objfile
19893 = cu->per_cu->dwarf2_per_objfile;
19894 struct objfile *objfile = dwarf2_per_objfile->objfile;
19895 const char *objf_name = objfile_name (objfile);
19896 bfd *abfd = objfile->obfd;
19897 struct dwarf2_section_info *str_section = &reader->dwo_file->sections.str;
19898 struct dwarf2_section_info *str_offsets_section =
19899 &reader->dwo_file->sections.str_offsets;
19900 const gdb_byte *info_ptr;
19901 ULONGEST str_offset;
19902 static const char form_name[] = "DW_FORM_GNU_str_index";
19904 dwarf2_read_section (objfile, str_section);
19905 dwarf2_read_section (objfile, str_offsets_section);
19906 if (str_section->buffer == NULL)
19907 error (_("%s used without .debug_str.dwo section"
19908 " in CU at offset %s [in module %s]"),
19909 form_name, sect_offset_str (cu->header.sect_off), objf_name);
19910 if (str_offsets_section->buffer == NULL)
19911 error (_("%s used without .debug_str_offsets.dwo section"
19912 " in CU at offset %s [in module %s]"),
19913 form_name, sect_offset_str (cu->header.sect_off), objf_name);
19914 if (str_index * cu->header.offset_size >= str_offsets_section->size)
19915 error (_("%s pointing outside of .debug_str_offsets.dwo"
19916 " section in CU at offset %s [in module %s]"),
19917 form_name, sect_offset_str (cu->header.sect_off), objf_name);
19918 info_ptr = (str_offsets_section->buffer
19919 + str_index * cu->header.offset_size);
19920 if (cu->header.offset_size == 4)
19921 str_offset = bfd_get_32 (abfd, info_ptr);
19923 str_offset = bfd_get_64 (abfd, info_ptr);
19924 if (str_offset >= str_section->size)
19925 error (_("Offset from %s pointing outside of"
19926 " .debug_str.dwo section in CU at offset %s [in module %s]"),
19927 form_name, sect_offset_str (cu->header.sect_off), objf_name);
19928 return (const char *) (str_section->buffer + str_offset);
19931 /* Return the length of an LEB128 number in BUF. */
19934 leb128_size (const gdb_byte *buf)
19936 const gdb_byte *begin = buf;
19942 if ((byte & 128) == 0)
19943 return buf - begin;
19948 set_cu_language (unsigned int lang, struct dwarf2_cu *cu)
19957 cu->language = language_c;
19960 case DW_LANG_C_plus_plus:
19961 case DW_LANG_C_plus_plus_11:
19962 case DW_LANG_C_plus_plus_14:
19963 cu->language = language_cplus;
19966 cu->language = language_d;
19968 case DW_LANG_Fortran77:
19969 case DW_LANG_Fortran90:
19970 case DW_LANG_Fortran95:
19971 case DW_LANG_Fortran03:
19972 case DW_LANG_Fortran08:
19973 cu->language = language_fortran;
19976 cu->language = language_go;
19978 case DW_LANG_Mips_Assembler:
19979 cu->language = language_asm;
19981 case DW_LANG_Ada83:
19982 case DW_LANG_Ada95:
19983 cu->language = language_ada;
19985 case DW_LANG_Modula2:
19986 cu->language = language_m2;
19988 case DW_LANG_Pascal83:
19989 cu->language = language_pascal;
19992 cu->language = language_objc;
19995 case DW_LANG_Rust_old:
19996 cu->language = language_rust;
19998 case DW_LANG_Cobol74:
19999 case DW_LANG_Cobol85:
20001 cu->language = language_minimal;
20004 cu->language_defn = language_def (cu->language);
20007 /* Return the named attribute or NULL if not there. */
20009 static struct attribute *
20010 dwarf2_attr (struct die_info *die, unsigned int name, struct dwarf2_cu *cu)
20015 struct attribute *spec = NULL;
20017 for (i = 0; i < die->num_attrs; ++i)
20019 if (die->attrs[i].name == name)
20020 return &die->attrs[i];
20021 if (die->attrs[i].name == DW_AT_specification
20022 || die->attrs[i].name == DW_AT_abstract_origin)
20023 spec = &die->attrs[i];
20029 die = follow_die_ref (die, spec, &cu);
20035 /* Return the named attribute or NULL if not there,
20036 but do not follow DW_AT_specification, etc.
20037 This is for use in contexts where we're reading .debug_types dies.
20038 Following DW_AT_specification, DW_AT_abstract_origin will take us
20039 back up the chain, and we want to go down. */
20041 static struct attribute *
20042 dwarf2_attr_no_follow (struct die_info *die, unsigned int name)
20046 for (i = 0; i < die->num_attrs; ++i)
20047 if (die->attrs[i].name == name)
20048 return &die->attrs[i];
20053 /* Return the string associated with a string-typed attribute, or NULL if it
20054 is either not found or is of an incorrect type. */
20056 static const char *
20057 dwarf2_string_attr (struct die_info *die, unsigned int name, struct dwarf2_cu *cu)
20059 struct attribute *attr;
20060 const char *str = NULL;
20062 attr = dwarf2_attr (die, name, cu);
20066 if (attr->form == DW_FORM_strp || attr->form == DW_FORM_line_strp
20067 || attr->form == DW_FORM_string
20068 || attr->form == DW_FORM_GNU_str_index
20069 || attr->form == DW_FORM_GNU_strp_alt)
20070 str = DW_STRING (attr);
20072 complaint (_("string type expected for attribute %s for "
20073 "DIE at %s in module %s"),
20074 dwarf_attr_name (name), sect_offset_str (die->sect_off),
20075 objfile_name (cu->per_cu->dwarf2_per_objfile->objfile));
20081 /* Return non-zero iff the attribute NAME is defined for the given DIE,
20082 and holds a non-zero value. This function should only be used for
20083 DW_FORM_flag or DW_FORM_flag_present attributes. */
20086 dwarf2_flag_true_p (struct die_info *die, unsigned name, struct dwarf2_cu *cu)
20088 struct attribute *attr = dwarf2_attr (die, name, cu);
20090 return (attr && DW_UNSND (attr));
20094 die_is_declaration (struct die_info *die, struct dwarf2_cu *cu)
20096 /* A DIE is a declaration if it has a DW_AT_declaration attribute
20097 which value is non-zero. However, we have to be careful with
20098 DIEs having a DW_AT_specification attribute, because dwarf2_attr()
20099 (via dwarf2_flag_true_p) follows this attribute. So we may
20100 end up accidently finding a declaration attribute that belongs
20101 to a different DIE referenced by the specification attribute,
20102 even though the given DIE does not have a declaration attribute. */
20103 return (dwarf2_flag_true_p (die, DW_AT_declaration, cu)
20104 && dwarf2_attr (die, DW_AT_specification, cu) == NULL);
20107 /* Return the die giving the specification for DIE, if there is
20108 one. *SPEC_CU is the CU containing DIE on input, and the CU
20109 containing the return value on output. If there is no
20110 specification, but there is an abstract origin, that is
20113 static struct die_info *
20114 die_specification (struct die_info *die, struct dwarf2_cu **spec_cu)
20116 struct attribute *spec_attr = dwarf2_attr (die, DW_AT_specification,
20119 if (spec_attr == NULL)
20120 spec_attr = dwarf2_attr (die, DW_AT_abstract_origin, *spec_cu);
20122 if (spec_attr == NULL)
20125 return follow_die_ref (die, spec_attr, spec_cu);
20128 /* Stub for free_line_header to match void * callback types. */
20131 free_line_header_voidp (void *arg)
20133 struct line_header *lh = (struct line_header *) arg;
20139 line_header::add_include_dir (const char *include_dir)
20141 if (dwarf_line_debug >= 2)
20142 fprintf_unfiltered (gdb_stdlog, "Adding dir %zu: %s\n",
20143 include_dirs.size () + 1, include_dir);
20145 include_dirs.push_back (include_dir);
20149 line_header::add_file_name (const char *name,
20151 unsigned int mod_time,
20152 unsigned int length)
20154 if (dwarf_line_debug >= 2)
20155 fprintf_unfiltered (gdb_stdlog, "Adding file %u: %s\n",
20156 (unsigned) file_names.size () + 1, name);
20158 file_names.emplace_back (name, d_index, mod_time, length);
20161 /* A convenience function to find the proper .debug_line section for a CU. */
20163 static struct dwarf2_section_info *
20164 get_debug_line_section (struct dwarf2_cu *cu)
20166 struct dwarf2_section_info *section;
20167 struct dwarf2_per_objfile *dwarf2_per_objfile
20168 = cu->per_cu->dwarf2_per_objfile;
20170 /* For TUs in DWO files, the DW_AT_stmt_list attribute lives in the
20172 if (cu->dwo_unit && cu->per_cu->is_debug_types)
20173 section = &cu->dwo_unit->dwo_file->sections.line;
20174 else if (cu->per_cu->is_dwz)
20176 struct dwz_file *dwz = dwarf2_get_dwz_file (dwarf2_per_objfile);
20178 section = &dwz->line;
20181 section = &dwarf2_per_objfile->line;
20186 /* Read directory or file name entry format, starting with byte of
20187 format count entries, ULEB128 pairs of entry formats, ULEB128 of
20188 entries count and the entries themselves in the described entry
20192 read_formatted_entries (struct dwarf2_per_objfile *dwarf2_per_objfile,
20193 bfd *abfd, const gdb_byte **bufp,
20194 struct line_header *lh,
20195 const struct comp_unit_head *cu_header,
20196 void (*callback) (struct line_header *lh,
20199 unsigned int mod_time,
20200 unsigned int length))
20202 gdb_byte format_count, formati;
20203 ULONGEST data_count, datai;
20204 const gdb_byte *buf = *bufp;
20205 const gdb_byte *format_header_data;
20206 unsigned int bytes_read;
20208 format_count = read_1_byte (abfd, buf);
20210 format_header_data = buf;
20211 for (formati = 0; formati < format_count; formati++)
20213 read_unsigned_leb128 (abfd, buf, &bytes_read);
20215 read_unsigned_leb128 (abfd, buf, &bytes_read);
20219 data_count = read_unsigned_leb128 (abfd, buf, &bytes_read);
20221 for (datai = 0; datai < data_count; datai++)
20223 const gdb_byte *format = format_header_data;
20224 struct file_entry fe;
20226 for (formati = 0; formati < format_count; formati++)
20228 ULONGEST content_type = read_unsigned_leb128 (abfd, format, &bytes_read);
20229 format += bytes_read;
20231 ULONGEST form = read_unsigned_leb128 (abfd, format, &bytes_read);
20232 format += bytes_read;
20234 gdb::optional<const char *> string;
20235 gdb::optional<unsigned int> uint;
20239 case DW_FORM_string:
20240 string.emplace (read_direct_string (abfd, buf, &bytes_read));
20244 case DW_FORM_line_strp:
20245 string.emplace (read_indirect_line_string (dwarf2_per_objfile,
20252 case DW_FORM_data1:
20253 uint.emplace (read_1_byte (abfd, buf));
20257 case DW_FORM_data2:
20258 uint.emplace (read_2_bytes (abfd, buf));
20262 case DW_FORM_data4:
20263 uint.emplace (read_4_bytes (abfd, buf));
20267 case DW_FORM_data8:
20268 uint.emplace (read_8_bytes (abfd, buf));
20272 case DW_FORM_udata:
20273 uint.emplace (read_unsigned_leb128 (abfd, buf, &bytes_read));
20277 case DW_FORM_block:
20278 /* It is valid only for DW_LNCT_timestamp which is ignored by
20283 switch (content_type)
20286 if (string.has_value ())
20289 case DW_LNCT_directory_index:
20290 if (uint.has_value ())
20291 fe.d_index = (dir_index) *uint;
20293 case DW_LNCT_timestamp:
20294 if (uint.has_value ())
20295 fe.mod_time = *uint;
20298 if (uint.has_value ())
20304 complaint (_("Unknown format content type %s"),
20305 pulongest (content_type));
20309 callback (lh, fe.name, fe.d_index, fe.mod_time, fe.length);
20315 /* Read the statement program header starting at OFFSET in
20316 .debug_line, or .debug_line.dwo. Return a pointer
20317 to a struct line_header, allocated using xmalloc.
20318 Returns NULL if there is a problem reading the header, e.g., if it
20319 has a version we don't understand.
20321 NOTE: the strings in the include directory and file name tables of
20322 the returned object point into the dwarf line section buffer,
20323 and must not be freed. */
20325 static line_header_up
20326 dwarf_decode_line_header (sect_offset sect_off, struct dwarf2_cu *cu)
20328 const gdb_byte *line_ptr;
20329 unsigned int bytes_read, offset_size;
20331 const char *cur_dir, *cur_file;
20332 struct dwarf2_section_info *section;
20334 struct dwarf2_per_objfile *dwarf2_per_objfile
20335 = cu->per_cu->dwarf2_per_objfile;
20337 section = get_debug_line_section (cu);
20338 dwarf2_read_section (dwarf2_per_objfile->objfile, section);
20339 if (section->buffer == NULL)
20341 if (cu->dwo_unit && cu->per_cu->is_debug_types)
20342 complaint (_("missing .debug_line.dwo section"));
20344 complaint (_("missing .debug_line section"));
20348 /* We can't do this until we know the section is non-empty.
20349 Only then do we know we have such a section. */
20350 abfd = get_section_bfd_owner (section);
20352 /* Make sure that at least there's room for the total_length field.
20353 That could be 12 bytes long, but we're just going to fudge that. */
20354 if (to_underlying (sect_off) + 4 >= section->size)
20356 dwarf2_statement_list_fits_in_line_number_section_complaint ();
20360 line_header_up lh (new line_header ());
20362 lh->sect_off = sect_off;
20363 lh->offset_in_dwz = cu->per_cu->is_dwz;
20365 line_ptr = section->buffer + to_underlying (sect_off);
20367 /* Read in the header. */
20369 read_checked_initial_length_and_offset (abfd, line_ptr, &cu->header,
20370 &bytes_read, &offset_size);
20371 line_ptr += bytes_read;
20372 if (line_ptr + lh->total_length > (section->buffer + section->size))
20374 dwarf2_statement_list_fits_in_line_number_section_complaint ();
20377 lh->statement_program_end = line_ptr + lh->total_length;
20378 lh->version = read_2_bytes (abfd, line_ptr);
20380 if (lh->version > 5)
20382 /* This is a version we don't understand. The format could have
20383 changed in ways we don't handle properly so just punt. */
20384 complaint (_("unsupported version in .debug_line section"));
20387 if (lh->version >= 5)
20389 gdb_byte segment_selector_size;
20391 /* Skip address size. */
20392 read_1_byte (abfd, line_ptr);
20395 segment_selector_size = read_1_byte (abfd, line_ptr);
20397 if (segment_selector_size != 0)
20399 complaint (_("unsupported segment selector size %u "
20400 "in .debug_line section"),
20401 segment_selector_size);
20405 lh->header_length = read_offset_1 (abfd, line_ptr, offset_size);
20406 line_ptr += offset_size;
20407 lh->minimum_instruction_length = read_1_byte (abfd, line_ptr);
20409 if (lh->version >= 4)
20411 lh->maximum_ops_per_instruction = read_1_byte (abfd, line_ptr);
20415 lh->maximum_ops_per_instruction = 1;
20417 if (lh->maximum_ops_per_instruction == 0)
20419 lh->maximum_ops_per_instruction = 1;
20420 complaint (_("invalid maximum_ops_per_instruction "
20421 "in `.debug_line' section"));
20424 lh->default_is_stmt = read_1_byte (abfd, line_ptr);
20426 lh->line_base = read_1_signed_byte (abfd, line_ptr);
20428 lh->line_range = read_1_byte (abfd, line_ptr);
20430 lh->opcode_base = read_1_byte (abfd, line_ptr);
20432 lh->standard_opcode_lengths.reset (new unsigned char[lh->opcode_base]);
20434 lh->standard_opcode_lengths[0] = 1; /* This should never be used anyway. */
20435 for (i = 1; i < lh->opcode_base; ++i)
20437 lh->standard_opcode_lengths[i] = read_1_byte (abfd, line_ptr);
20441 if (lh->version >= 5)
20443 /* Read directory table. */
20444 read_formatted_entries (dwarf2_per_objfile, abfd, &line_ptr, lh.get (),
20446 [] (struct line_header *header, const char *name,
20447 dir_index d_index, unsigned int mod_time,
20448 unsigned int length)
20450 header->add_include_dir (name);
20453 /* Read file name table. */
20454 read_formatted_entries (dwarf2_per_objfile, abfd, &line_ptr, lh.get (),
20456 [] (struct line_header *header, const char *name,
20457 dir_index d_index, unsigned int mod_time,
20458 unsigned int length)
20460 header->add_file_name (name, d_index, mod_time, length);
20465 /* Read directory table. */
20466 while ((cur_dir = read_direct_string (abfd, line_ptr, &bytes_read)) != NULL)
20468 line_ptr += bytes_read;
20469 lh->add_include_dir (cur_dir);
20471 line_ptr += bytes_read;
20473 /* Read file name table. */
20474 while ((cur_file = read_direct_string (abfd, line_ptr, &bytes_read)) != NULL)
20476 unsigned int mod_time, length;
20479 line_ptr += bytes_read;
20480 d_index = (dir_index) read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
20481 line_ptr += bytes_read;
20482 mod_time = read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
20483 line_ptr += bytes_read;
20484 length = read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
20485 line_ptr += bytes_read;
20487 lh->add_file_name (cur_file, d_index, mod_time, length);
20489 line_ptr += bytes_read;
20491 lh->statement_program_start = line_ptr;
20493 if (line_ptr > (section->buffer + section->size))
20494 complaint (_("line number info header doesn't "
20495 "fit in `.debug_line' section"));
20500 /* Subroutine of dwarf_decode_lines to simplify it.
20501 Return the file name of the psymtab for included file FILE_INDEX
20502 in line header LH of PST.
20503 COMP_DIR is the compilation directory (DW_AT_comp_dir) or NULL if unknown.
20504 If space for the result is malloc'd, *NAME_HOLDER will be set.
20505 Returns NULL if FILE_INDEX should be ignored, i.e., it is pst->filename. */
20507 static const char *
20508 psymtab_include_file_name (const struct line_header *lh, int file_index,
20509 const struct partial_symtab *pst,
20510 const char *comp_dir,
20511 gdb::unique_xmalloc_ptr<char> *name_holder)
20513 const file_entry &fe = lh->file_names[file_index];
20514 const char *include_name = fe.name;
20515 const char *include_name_to_compare = include_name;
20516 const char *pst_filename;
20519 const char *dir_name = fe.include_dir (lh);
20521 gdb::unique_xmalloc_ptr<char> hold_compare;
20522 if (!IS_ABSOLUTE_PATH (include_name)
20523 && (dir_name != NULL || comp_dir != NULL))
20525 /* Avoid creating a duplicate psymtab for PST.
20526 We do this by comparing INCLUDE_NAME and PST_FILENAME.
20527 Before we do the comparison, however, we need to account
20528 for DIR_NAME and COMP_DIR.
20529 First prepend dir_name (if non-NULL). If we still don't
20530 have an absolute path prepend comp_dir (if non-NULL).
20531 However, the directory we record in the include-file's
20532 psymtab does not contain COMP_DIR (to match the
20533 corresponding symtab(s)).
20538 bash$ gcc -g ./hello.c
20539 include_name = "hello.c"
20541 DW_AT_comp_dir = comp_dir = "/tmp"
20542 DW_AT_name = "./hello.c"
20546 if (dir_name != NULL)
20548 name_holder->reset (concat (dir_name, SLASH_STRING,
20549 include_name, (char *) NULL));
20550 include_name = name_holder->get ();
20551 include_name_to_compare = include_name;
20553 if (!IS_ABSOLUTE_PATH (include_name) && comp_dir != NULL)
20555 hold_compare.reset (concat (comp_dir, SLASH_STRING,
20556 include_name, (char *) NULL));
20557 include_name_to_compare = hold_compare.get ();
20561 pst_filename = pst->filename;
20562 gdb::unique_xmalloc_ptr<char> copied_name;
20563 if (!IS_ABSOLUTE_PATH (pst_filename) && pst->dirname != NULL)
20565 copied_name.reset (concat (pst->dirname, SLASH_STRING,
20566 pst_filename, (char *) NULL));
20567 pst_filename = copied_name.get ();
20570 file_is_pst = FILENAME_CMP (include_name_to_compare, pst_filename) == 0;
20574 return include_name;
20577 /* State machine to track the state of the line number program. */
20579 class lnp_state_machine
20582 /* Initialize a machine state for the start of a line number
20584 lnp_state_machine (struct dwarf2_cu *cu, gdbarch *arch, line_header *lh,
20585 bool record_lines_p);
20587 file_entry *current_file ()
20589 /* lh->file_names is 0-based, but the file name numbers in the
20590 statement program are 1-based. */
20591 return m_line_header->file_name_at (m_file);
20594 /* Record the line in the state machine. END_SEQUENCE is true if
20595 we're processing the end of a sequence. */
20596 void record_line (bool end_sequence);
20598 /* Check ADDRESS is zero and less than UNRELOCATED_LOWPC and if true
20599 nop-out rest of the lines in this sequence. */
20600 void check_line_address (struct dwarf2_cu *cu,
20601 const gdb_byte *line_ptr,
20602 CORE_ADDR unrelocated_lowpc, CORE_ADDR address);
20604 void handle_set_discriminator (unsigned int discriminator)
20606 m_discriminator = discriminator;
20607 m_line_has_non_zero_discriminator |= discriminator != 0;
20610 /* Handle DW_LNE_set_address. */
20611 void handle_set_address (CORE_ADDR baseaddr, CORE_ADDR address)
20614 address += baseaddr;
20615 m_address = gdbarch_adjust_dwarf2_line (m_gdbarch, address, false);
20618 /* Handle DW_LNS_advance_pc. */
20619 void handle_advance_pc (CORE_ADDR adjust);
20621 /* Handle a special opcode. */
20622 void handle_special_opcode (unsigned char op_code);
20624 /* Handle DW_LNS_advance_line. */
20625 void handle_advance_line (int line_delta)
20627 advance_line (line_delta);
20630 /* Handle DW_LNS_set_file. */
20631 void handle_set_file (file_name_index file);
20633 /* Handle DW_LNS_negate_stmt. */
20634 void handle_negate_stmt ()
20636 m_is_stmt = !m_is_stmt;
20639 /* Handle DW_LNS_const_add_pc. */
20640 void handle_const_add_pc ();
20642 /* Handle DW_LNS_fixed_advance_pc. */
20643 void handle_fixed_advance_pc (CORE_ADDR addr_adj)
20645 m_address += gdbarch_adjust_dwarf2_line (m_gdbarch, addr_adj, true);
20649 /* Handle DW_LNS_copy. */
20650 void handle_copy ()
20652 record_line (false);
20653 m_discriminator = 0;
20656 /* Handle DW_LNE_end_sequence. */
20657 void handle_end_sequence ()
20659 m_currently_recording_lines = true;
20663 /* Advance the line by LINE_DELTA. */
20664 void advance_line (int line_delta)
20666 m_line += line_delta;
20668 if (line_delta != 0)
20669 m_line_has_non_zero_discriminator = m_discriminator != 0;
20672 struct dwarf2_cu *m_cu;
20674 gdbarch *m_gdbarch;
20676 /* True if we're recording lines.
20677 Otherwise we're building partial symtabs and are just interested in
20678 finding include files mentioned by the line number program. */
20679 bool m_record_lines_p;
20681 /* The line number header. */
20682 line_header *m_line_header;
20684 /* These are part of the standard DWARF line number state machine,
20685 and initialized according to the DWARF spec. */
20687 unsigned char m_op_index = 0;
20688 /* The line table index (1-based) of the current file. */
20689 file_name_index m_file = (file_name_index) 1;
20690 unsigned int m_line = 1;
20692 /* These are initialized in the constructor. */
20694 CORE_ADDR m_address;
20696 unsigned int m_discriminator;
20698 /* Additional bits of state we need to track. */
20700 /* The last file that we called dwarf2_start_subfile for.
20701 This is only used for TLLs. */
20702 unsigned int m_last_file = 0;
20703 /* The last file a line number was recorded for. */
20704 struct subfile *m_last_subfile = NULL;
20706 /* When true, record the lines we decode. */
20707 bool m_currently_recording_lines = false;
20709 /* The last line number that was recorded, used to coalesce
20710 consecutive entries for the same line. This can happen, for
20711 example, when discriminators are present. PR 17276. */
20712 unsigned int m_last_line = 0;
20713 bool m_line_has_non_zero_discriminator = false;
20717 lnp_state_machine::handle_advance_pc (CORE_ADDR adjust)
20719 CORE_ADDR addr_adj = (((m_op_index + adjust)
20720 / m_line_header->maximum_ops_per_instruction)
20721 * m_line_header->minimum_instruction_length);
20722 m_address += gdbarch_adjust_dwarf2_line (m_gdbarch, addr_adj, true);
20723 m_op_index = ((m_op_index + adjust)
20724 % m_line_header->maximum_ops_per_instruction);
20728 lnp_state_machine::handle_special_opcode (unsigned char op_code)
20730 unsigned char adj_opcode = op_code - m_line_header->opcode_base;
20731 CORE_ADDR addr_adj = (((m_op_index
20732 + (adj_opcode / m_line_header->line_range))
20733 / m_line_header->maximum_ops_per_instruction)
20734 * m_line_header->minimum_instruction_length);
20735 m_address += gdbarch_adjust_dwarf2_line (m_gdbarch, addr_adj, true);
20736 m_op_index = ((m_op_index + (adj_opcode / m_line_header->line_range))
20737 % m_line_header->maximum_ops_per_instruction);
20739 int line_delta = (m_line_header->line_base
20740 + (adj_opcode % m_line_header->line_range));
20741 advance_line (line_delta);
20742 record_line (false);
20743 m_discriminator = 0;
20747 lnp_state_machine::handle_set_file (file_name_index file)
20751 const file_entry *fe = current_file ();
20753 dwarf2_debug_line_missing_file_complaint ();
20754 else if (m_record_lines_p)
20756 const char *dir = fe->include_dir (m_line_header);
20758 m_last_subfile = m_cu->get_builder ()->get_current_subfile ();
20759 m_line_has_non_zero_discriminator = m_discriminator != 0;
20760 dwarf2_start_subfile (m_cu, fe->name, dir);
20765 lnp_state_machine::handle_const_add_pc ()
20768 = (255 - m_line_header->opcode_base) / m_line_header->line_range;
20771 = (((m_op_index + adjust)
20772 / m_line_header->maximum_ops_per_instruction)
20773 * m_line_header->minimum_instruction_length);
20775 m_address += gdbarch_adjust_dwarf2_line (m_gdbarch, addr_adj, true);
20776 m_op_index = ((m_op_index + adjust)
20777 % m_line_header->maximum_ops_per_instruction);
20780 /* Return non-zero if we should add LINE to the line number table.
20781 LINE is the line to add, LAST_LINE is the last line that was added,
20782 LAST_SUBFILE is the subfile for LAST_LINE.
20783 LINE_HAS_NON_ZERO_DISCRIMINATOR is non-zero if LINE has ever
20784 had a non-zero discriminator.
20786 We have to be careful in the presence of discriminators.
20787 E.g., for this line:
20789 for (i = 0; i < 100000; i++);
20791 clang can emit four line number entries for that one line,
20792 each with a different discriminator.
20793 See gdb.dwarf2/dw2-single-line-discriminators.exp for an example.
20795 However, we want gdb to coalesce all four entries into one.
20796 Otherwise the user could stepi into the middle of the line and
20797 gdb would get confused about whether the pc really was in the
20798 middle of the line.
20800 Things are further complicated by the fact that two consecutive
20801 line number entries for the same line is a heuristic used by gcc
20802 to denote the end of the prologue. So we can't just discard duplicate
20803 entries, we have to be selective about it. The heuristic we use is
20804 that we only collapse consecutive entries for the same line if at least
20805 one of those entries has a non-zero discriminator. PR 17276.
20807 Note: Addresses in the line number state machine can never go backwards
20808 within one sequence, thus this coalescing is ok. */
20811 dwarf_record_line_p (struct dwarf2_cu *cu,
20812 unsigned int line, unsigned int last_line,
20813 int line_has_non_zero_discriminator,
20814 struct subfile *last_subfile)
20816 if (cu->get_builder ()->get_current_subfile () != last_subfile)
20818 if (line != last_line)
20820 /* Same line for the same file that we've seen already.
20821 As a last check, for pr 17276, only record the line if the line
20822 has never had a non-zero discriminator. */
20823 if (!line_has_non_zero_discriminator)
20828 /* Use the CU's builder to record line number LINE beginning at
20829 address ADDRESS in the line table of subfile SUBFILE. */
20832 dwarf_record_line_1 (struct gdbarch *gdbarch, struct subfile *subfile,
20833 unsigned int line, CORE_ADDR address,
20834 struct dwarf2_cu *cu)
20836 CORE_ADDR addr = gdbarch_addr_bits_remove (gdbarch, address);
20838 if (dwarf_line_debug)
20840 fprintf_unfiltered (gdb_stdlog,
20841 "Recording line %u, file %s, address %s\n",
20842 line, lbasename (subfile->name),
20843 paddress (gdbarch, address));
20847 cu->get_builder ()->record_line (subfile, line, addr);
20850 /* Subroutine of dwarf_decode_lines_1 to simplify it.
20851 Mark the end of a set of line number records.
20852 The arguments are the same as for dwarf_record_line_1.
20853 If SUBFILE is NULL the request is ignored. */
20856 dwarf_finish_line (struct gdbarch *gdbarch, struct subfile *subfile,
20857 CORE_ADDR address, struct dwarf2_cu *cu)
20859 if (subfile == NULL)
20862 if (dwarf_line_debug)
20864 fprintf_unfiltered (gdb_stdlog,
20865 "Finishing current line, file %s, address %s\n",
20866 lbasename (subfile->name),
20867 paddress (gdbarch, address));
20870 dwarf_record_line_1 (gdbarch, subfile, 0, address, cu);
20874 lnp_state_machine::record_line (bool end_sequence)
20876 if (dwarf_line_debug)
20878 fprintf_unfiltered (gdb_stdlog,
20879 "Processing actual line %u: file %u,"
20880 " address %s, is_stmt %u, discrim %u\n",
20881 m_line, to_underlying (m_file),
20882 paddress (m_gdbarch, m_address),
20883 m_is_stmt, m_discriminator);
20886 file_entry *fe = current_file ();
20889 dwarf2_debug_line_missing_file_complaint ();
20890 /* For now we ignore lines not starting on an instruction boundary.
20891 But not when processing end_sequence for compatibility with the
20892 previous version of the code. */
20893 else if (m_op_index == 0 || end_sequence)
20895 fe->included_p = 1;
20896 if (m_record_lines_p && (producer_is_codewarrior (m_cu) || m_is_stmt))
20898 if (m_last_subfile != m_cu->get_builder ()->get_current_subfile ()
20901 dwarf_finish_line (m_gdbarch, m_last_subfile, m_address,
20902 m_currently_recording_lines ? m_cu : nullptr);
20907 if (dwarf_record_line_p (m_cu, m_line, m_last_line,
20908 m_line_has_non_zero_discriminator,
20911 buildsym_compunit *builder = m_cu->get_builder ();
20912 dwarf_record_line_1 (m_gdbarch,
20913 builder->get_current_subfile (),
20915 m_currently_recording_lines ? m_cu : nullptr);
20917 m_last_subfile = m_cu->get_builder ()->get_current_subfile ();
20918 m_last_line = m_line;
20924 lnp_state_machine::lnp_state_machine (struct dwarf2_cu *cu, gdbarch *arch,
20925 line_header *lh, bool record_lines_p)
20929 m_record_lines_p = record_lines_p;
20930 m_line_header = lh;
20932 m_currently_recording_lines = true;
20934 /* Call `gdbarch_adjust_dwarf2_line' on the initial 0 address as if there
20935 was a line entry for it so that the backend has a chance to adjust it
20936 and also record it in case it needs it. This is currently used by MIPS
20937 code, cf. `mips_adjust_dwarf2_line'. */
20938 m_address = gdbarch_adjust_dwarf2_line (arch, 0, 0);
20939 m_is_stmt = lh->default_is_stmt;
20940 m_discriminator = 0;
20944 lnp_state_machine::check_line_address (struct dwarf2_cu *cu,
20945 const gdb_byte *line_ptr,
20946 CORE_ADDR unrelocated_lowpc, CORE_ADDR address)
20948 /* If ADDRESS < UNRELOCATED_LOWPC then it's not a usable value, it's outside
20949 the pc range of the CU. However, we restrict the test to only ADDRESS
20950 values of zero to preserve GDB's previous behaviour which is to handle
20951 the specific case of a function being GC'd by the linker. */
20953 if (address == 0 && address < unrelocated_lowpc)
20955 /* This line table is for a function which has been
20956 GCd by the linker. Ignore it. PR gdb/12528 */
20958 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
20959 long line_offset = line_ptr - get_debug_line_section (cu)->buffer;
20961 complaint (_(".debug_line address at offset 0x%lx is 0 [in module %s]"),
20962 line_offset, objfile_name (objfile));
20963 m_currently_recording_lines = false;
20964 /* Note: m_currently_recording_lines is left as false until we see
20965 DW_LNE_end_sequence. */
20969 /* Subroutine of dwarf_decode_lines to simplify it.
20970 Process the line number information in LH.
20971 If DECODE_FOR_PST_P is non-zero, all we do is process the line number
20972 program in order to set included_p for every referenced header. */
20975 dwarf_decode_lines_1 (struct line_header *lh, struct dwarf2_cu *cu,
20976 const int decode_for_pst_p, CORE_ADDR lowpc)
20978 const gdb_byte *line_ptr, *extended_end;
20979 const gdb_byte *line_end;
20980 unsigned int bytes_read, extended_len;
20981 unsigned char op_code, extended_op;
20982 CORE_ADDR baseaddr;
20983 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
20984 bfd *abfd = objfile->obfd;
20985 struct gdbarch *gdbarch = get_objfile_arch (objfile);
20986 /* True if we're recording line info (as opposed to building partial
20987 symtabs and just interested in finding include files mentioned by
20988 the line number program). */
20989 bool record_lines_p = !decode_for_pst_p;
20991 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
20993 line_ptr = lh->statement_program_start;
20994 line_end = lh->statement_program_end;
20996 /* Read the statement sequences until there's nothing left. */
20997 while (line_ptr < line_end)
20999 /* The DWARF line number program state machine. Reset the state
21000 machine at the start of each sequence. */
21001 lnp_state_machine state_machine (cu, gdbarch, lh, record_lines_p);
21002 bool end_sequence = false;
21004 if (record_lines_p)
21006 /* Start a subfile for the current file of the state
21008 const file_entry *fe = state_machine.current_file ();
21011 dwarf2_start_subfile (cu, fe->name, fe->include_dir (lh));
21014 /* Decode the table. */
21015 while (line_ptr < line_end && !end_sequence)
21017 op_code = read_1_byte (abfd, line_ptr);
21020 if (op_code >= lh->opcode_base)
21022 /* Special opcode. */
21023 state_machine.handle_special_opcode (op_code);
21025 else switch (op_code)
21027 case DW_LNS_extended_op:
21028 extended_len = read_unsigned_leb128 (abfd, line_ptr,
21030 line_ptr += bytes_read;
21031 extended_end = line_ptr + extended_len;
21032 extended_op = read_1_byte (abfd, line_ptr);
21034 switch (extended_op)
21036 case DW_LNE_end_sequence:
21037 state_machine.handle_end_sequence ();
21038 end_sequence = true;
21040 case DW_LNE_set_address:
21043 = read_address (abfd, line_ptr, cu, &bytes_read);
21044 line_ptr += bytes_read;
21046 state_machine.check_line_address (cu, line_ptr,
21047 lowpc - baseaddr, address);
21048 state_machine.handle_set_address (baseaddr, address);
21051 case DW_LNE_define_file:
21053 const char *cur_file;
21054 unsigned int mod_time, length;
21057 cur_file = read_direct_string (abfd, line_ptr,
21059 line_ptr += bytes_read;
21060 dindex = (dir_index)
21061 read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
21062 line_ptr += bytes_read;
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;
21069 lh->add_file_name (cur_file, dindex, mod_time, length);
21072 case DW_LNE_set_discriminator:
21074 /* The discriminator is not interesting to the
21075 debugger; just ignore it. We still need to
21076 check its value though:
21077 if there are consecutive entries for the same
21078 (non-prologue) line we want to coalesce them.
21081 = read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
21082 line_ptr += bytes_read;
21084 state_machine.handle_set_discriminator (discr);
21088 complaint (_("mangled .debug_line section"));
21091 /* Make sure that we parsed the extended op correctly. If e.g.
21092 we expected a different address size than the producer used,
21093 we may have read the wrong number of bytes. */
21094 if (line_ptr != extended_end)
21096 complaint (_("mangled .debug_line section"));
21101 state_machine.handle_copy ();
21103 case DW_LNS_advance_pc:
21106 = read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
21107 line_ptr += bytes_read;
21109 state_machine.handle_advance_pc (adjust);
21112 case DW_LNS_advance_line:
21115 = read_signed_leb128 (abfd, line_ptr, &bytes_read);
21116 line_ptr += bytes_read;
21118 state_machine.handle_advance_line (line_delta);
21121 case DW_LNS_set_file:
21123 file_name_index file
21124 = (file_name_index) read_unsigned_leb128 (abfd, line_ptr,
21126 line_ptr += bytes_read;
21128 state_machine.handle_set_file (file);
21131 case DW_LNS_set_column:
21132 (void) read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
21133 line_ptr += bytes_read;
21135 case DW_LNS_negate_stmt:
21136 state_machine.handle_negate_stmt ();
21138 case DW_LNS_set_basic_block:
21140 /* Add to the address register of the state machine the
21141 address increment value corresponding to special opcode
21142 255. I.e., this value is scaled by the minimum
21143 instruction length since special opcode 255 would have
21144 scaled the increment. */
21145 case DW_LNS_const_add_pc:
21146 state_machine.handle_const_add_pc ();
21148 case DW_LNS_fixed_advance_pc:
21150 CORE_ADDR addr_adj = read_2_bytes (abfd, line_ptr);
21153 state_machine.handle_fixed_advance_pc (addr_adj);
21158 /* Unknown standard opcode, ignore it. */
21161 for (i = 0; i < lh->standard_opcode_lengths[op_code]; i++)
21163 (void) read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
21164 line_ptr += bytes_read;
21171 dwarf2_debug_line_missing_end_sequence_complaint ();
21173 /* We got a DW_LNE_end_sequence (or we ran off the end of the buffer,
21174 in which case we still finish recording the last line). */
21175 state_machine.record_line (true);
21179 /* Decode the Line Number Program (LNP) for the given line_header
21180 structure and CU. The actual information extracted and the type
21181 of structures created from the LNP depends on the value of PST.
21183 1. If PST is NULL, then this procedure uses the data from the program
21184 to create all necessary symbol tables, and their linetables.
21186 2. If PST is not NULL, this procedure reads the program to determine
21187 the list of files included by the unit represented by PST, and
21188 builds all the associated partial symbol tables.
21190 COMP_DIR is the compilation directory (DW_AT_comp_dir) or NULL if unknown.
21191 It is used for relative paths in the line table.
21192 NOTE: When processing partial symtabs (pst != NULL),
21193 comp_dir == pst->dirname.
21195 NOTE: It is important that psymtabs have the same file name (via strcmp)
21196 as the corresponding symtab. Since COMP_DIR is not used in the name of the
21197 symtab we don't use it in the name of the psymtabs we create.
21198 E.g. expand_line_sal requires this when finding psymtabs to expand.
21199 A good testcase for this is mb-inline.exp.
21201 LOWPC is the lowest address in CU (or 0 if not known).
21203 Boolean DECODE_MAPPING specifies we need to fully decode .debug_line
21204 for its PC<->lines mapping information. Otherwise only the filename
21205 table is read in. */
21208 dwarf_decode_lines (struct line_header *lh, const char *comp_dir,
21209 struct dwarf2_cu *cu, struct partial_symtab *pst,
21210 CORE_ADDR lowpc, int decode_mapping)
21212 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
21213 const int decode_for_pst_p = (pst != NULL);
21215 if (decode_mapping)
21216 dwarf_decode_lines_1 (lh, cu, decode_for_pst_p, lowpc);
21218 if (decode_for_pst_p)
21222 /* Now that we're done scanning the Line Header Program, we can
21223 create the psymtab of each included file. */
21224 for (file_index = 0; file_index < lh->file_names.size (); file_index++)
21225 if (lh->file_names[file_index].included_p == 1)
21227 gdb::unique_xmalloc_ptr<char> name_holder;
21228 const char *include_name =
21229 psymtab_include_file_name (lh, file_index, pst, comp_dir,
21231 if (include_name != NULL)
21232 dwarf2_create_include_psymtab (include_name, pst, objfile);
21237 /* Make sure a symtab is created for every file, even files
21238 which contain only variables (i.e. no code with associated
21240 buildsym_compunit *builder = cu->get_builder ();
21241 struct compunit_symtab *cust = builder->get_compunit_symtab ();
21244 for (i = 0; i < lh->file_names.size (); i++)
21246 file_entry &fe = lh->file_names[i];
21248 dwarf2_start_subfile (cu, fe.name, fe.include_dir (lh));
21250 if (builder->get_current_subfile ()->symtab == NULL)
21252 builder->get_current_subfile ()->symtab
21253 = allocate_symtab (cust,
21254 builder->get_current_subfile ()->name);
21256 fe.symtab = builder->get_current_subfile ()->symtab;
21261 /* Start a subfile for DWARF. FILENAME is the name of the file and
21262 DIRNAME the name of the source directory which contains FILENAME
21263 or NULL if not known.
21264 This routine tries to keep line numbers from identical absolute and
21265 relative file names in a common subfile.
21267 Using the `list' example from the GDB testsuite, which resides in
21268 /srcdir and compiling it with Irix6.2 cc in /compdir using a filename
21269 of /srcdir/list0.c yields the following debugging information for list0.c:
21271 DW_AT_name: /srcdir/list0.c
21272 DW_AT_comp_dir: /compdir
21273 files.files[0].name: list0.h
21274 files.files[0].dir: /srcdir
21275 files.files[1].name: list0.c
21276 files.files[1].dir: /srcdir
21278 The line number information for list0.c has to end up in a single
21279 subfile, so that `break /srcdir/list0.c:1' works as expected.
21280 start_subfile will ensure that this happens provided that we pass the
21281 concatenation of files.files[1].dir and files.files[1].name as the
21285 dwarf2_start_subfile (struct dwarf2_cu *cu, const char *filename,
21286 const char *dirname)
21290 /* In order not to lose the line information directory,
21291 we concatenate it to the filename when it makes sense.
21292 Note that the Dwarf3 standard says (speaking of filenames in line
21293 information): ``The directory index is ignored for file names
21294 that represent full path names''. Thus ignoring dirname in the
21295 `else' branch below isn't an issue. */
21297 if (!IS_ABSOLUTE_PATH (filename) && dirname != NULL)
21299 copy = concat (dirname, SLASH_STRING, filename, (char *)NULL);
21303 cu->get_builder ()->start_subfile (filename);
21309 /* Start a symtab for DWARF. NAME, COMP_DIR, LOW_PC are passed to the
21310 buildsym_compunit constructor. */
21312 struct compunit_symtab *
21313 dwarf2_cu::start_symtab (const char *name, const char *comp_dir,
21316 gdb_assert (m_builder == nullptr);
21318 m_builder.reset (new struct buildsym_compunit
21319 (per_cu->dwarf2_per_objfile->objfile,
21320 name, comp_dir, language, low_pc));
21322 list_in_scope = get_builder ()->get_file_symbols ();
21324 get_builder ()->record_debugformat ("DWARF 2");
21325 get_builder ()->record_producer (producer);
21327 processing_has_namespace_info = false;
21329 return get_builder ()->get_compunit_symtab ();
21333 var_decode_location (struct attribute *attr, struct symbol *sym,
21334 struct dwarf2_cu *cu)
21336 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
21337 struct comp_unit_head *cu_header = &cu->header;
21339 /* NOTE drow/2003-01-30: There used to be a comment and some special
21340 code here to turn a symbol with DW_AT_external and a
21341 SYMBOL_VALUE_ADDRESS of 0 into a LOC_UNRESOLVED symbol. This was
21342 necessary for platforms (maybe Alpha, certainly PowerPC GNU/Linux
21343 with some versions of binutils) where shared libraries could have
21344 relocations against symbols in their debug information - the
21345 minimal symbol would have the right address, but the debug info
21346 would not. It's no longer necessary, because we will explicitly
21347 apply relocations when we read in the debug information now. */
21349 /* A DW_AT_location attribute with no contents indicates that a
21350 variable has been optimized away. */
21351 if (attr_form_is_block (attr) && DW_BLOCK (attr)->size == 0)
21353 SYMBOL_ACLASS_INDEX (sym) = LOC_OPTIMIZED_OUT;
21357 /* Handle one degenerate form of location expression specially, to
21358 preserve GDB's previous behavior when section offsets are
21359 specified. If this is just a DW_OP_addr, DW_OP_addrx, or
21360 DW_OP_GNU_addr_index then mark this symbol as LOC_STATIC. */
21362 if (attr_form_is_block (attr)
21363 && ((DW_BLOCK (attr)->data[0] == DW_OP_addr
21364 && DW_BLOCK (attr)->size == 1 + cu_header->addr_size)
21365 || ((DW_BLOCK (attr)->data[0] == DW_OP_GNU_addr_index
21366 || DW_BLOCK (attr)->data[0] == DW_OP_addrx)
21367 && (DW_BLOCK (attr)->size
21368 == 1 + leb128_size (&DW_BLOCK (attr)->data[1])))))
21370 unsigned int dummy;
21372 if (DW_BLOCK (attr)->data[0] == DW_OP_addr)
21373 SYMBOL_VALUE_ADDRESS (sym) =
21374 read_address (objfile->obfd, DW_BLOCK (attr)->data + 1, cu, &dummy);
21376 SYMBOL_VALUE_ADDRESS (sym) =
21377 read_addr_index_from_leb128 (cu, DW_BLOCK (attr)->data + 1, &dummy);
21378 SYMBOL_ACLASS_INDEX (sym) = LOC_STATIC;
21379 fixup_symbol_section (sym, objfile);
21380 SYMBOL_VALUE_ADDRESS (sym) += ANOFFSET (objfile->section_offsets,
21381 SYMBOL_SECTION (sym));
21385 /* NOTE drow/2002-01-30: It might be worthwhile to have a static
21386 expression evaluator, and use LOC_COMPUTED only when necessary
21387 (i.e. when the value of a register or memory location is
21388 referenced, or a thread-local block, etc.). Then again, it might
21389 not be worthwhile. I'm assuming that it isn't unless performance
21390 or memory numbers show me otherwise. */
21392 dwarf2_symbol_mark_computed (attr, sym, cu, 0);
21394 if (SYMBOL_COMPUTED_OPS (sym)->location_has_loclist)
21395 cu->has_loclist = true;
21398 /* Given a pointer to a DWARF information entry, figure out if we need
21399 to make a symbol table entry for it, and if so, create a new entry
21400 and return a pointer to it.
21401 If TYPE is NULL, determine symbol type from the die, otherwise
21402 used the passed type.
21403 If SPACE is not NULL, use it to hold the new symbol. If it is
21404 NULL, allocate a new symbol on the objfile's obstack. */
21406 static struct symbol *
21407 new_symbol (struct die_info *die, struct type *type, struct dwarf2_cu *cu,
21408 struct symbol *space)
21410 struct dwarf2_per_objfile *dwarf2_per_objfile
21411 = cu->per_cu->dwarf2_per_objfile;
21412 struct objfile *objfile = dwarf2_per_objfile->objfile;
21413 struct gdbarch *gdbarch = get_objfile_arch (objfile);
21414 struct symbol *sym = NULL;
21416 struct attribute *attr = NULL;
21417 struct attribute *attr2 = NULL;
21418 CORE_ADDR baseaddr;
21419 struct pending **list_to_add = NULL;
21421 int inlined_func = (die->tag == DW_TAG_inlined_subroutine);
21423 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
21425 name = dwarf2_name (die, cu);
21428 const char *linkagename;
21429 int suppress_add = 0;
21434 sym = allocate_symbol (objfile);
21435 OBJSTAT (objfile, n_syms++);
21437 /* Cache this symbol's name and the name's demangled form (if any). */
21438 SYMBOL_SET_LANGUAGE (sym, cu->language, &objfile->objfile_obstack);
21439 linkagename = dwarf2_physname (name, die, cu);
21440 SYMBOL_SET_NAMES (sym, linkagename, strlen (linkagename), 0, objfile);
21442 /* Fortran does not have mangling standard and the mangling does differ
21443 between gfortran, iFort etc. */
21444 if (cu->language == language_fortran
21445 && symbol_get_demangled_name (&(sym->ginfo)) == NULL)
21446 symbol_set_demangled_name (&(sym->ginfo),
21447 dwarf2_full_name (name, die, cu),
21450 /* Default assumptions.
21451 Use the passed type or decode it from the die. */
21452 SYMBOL_DOMAIN (sym) = VAR_DOMAIN;
21453 SYMBOL_ACLASS_INDEX (sym) = LOC_OPTIMIZED_OUT;
21455 SYMBOL_TYPE (sym) = type;
21457 SYMBOL_TYPE (sym) = die_type (die, cu);
21458 attr = dwarf2_attr (die,
21459 inlined_func ? DW_AT_call_line : DW_AT_decl_line,
21463 SYMBOL_LINE (sym) = DW_UNSND (attr);
21466 attr = dwarf2_attr (die,
21467 inlined_func ? DW_AT_call_file : DW_AT_decl_file,
21471 file_name_index file_index = (file_name_index) DW_UNSND (attr);
21472 struct file_entry *fe;
21474 if (cu->line_header != NULL)
21475 fe = cu->line_header->file_name_at (file_index);
21480 complaint (_("file index out of range"));
21482 symbol_set_symtab (sym, fe->symtab);
21488 attr = dwarf2_attr (die, DW_AT_low_pc, cu);
21493 addr = attr_value_as_address (attr);
21494 addr = gdbarch_adjust_dwarf2_addr (gdbarch, addr + baseaddr);
21495 SYMBOL_VALUE_ADDRESS (sym) = addr;
21497 SYMBOL_TYPE (sym) = objfile_type (objfile)->builtin_core_addr;
21498 SYMBOL_DOMAIN (sym) = LABEL_DOMAIN;
21499 SYMBOL_ACLASS_INDEX (sym) = LOC_LABEL;
21500 add_symbol_to_list (sym, cu->list_in_scope);
21502 case DW_TAG_subprogram:
21503 /* SYMBOL_BLOCK_VALUE (sym) will be filled in later by
21505 SYMBOL_ACLASS_INDEX (sym) = LOC_BLOCK;
21506 attr2 = dwarf2_attr (die, DW_AT_external, cu);
21507 if ((attr2 && (DW_UNSND (attr2) != 0))
21508 || cu->language == language_ada)
21510 /* Subprograms marked external are stored as a global symbol.
21511 Ada subprograms, whether marked external or not, are always
21512 stored as a global symbol, because we want to be able to
21513 access them globally. For instance, we want to be able
21514 to break on a nested subprogram without having to
21515 specify the context. */
21516 list_to_add = cu->get_builder ()->get_global_symbols ();
21520 list_to_add = cu->list_in_scope;
21523 case DW_TAG_inlined_subroutine:
21524 /* SYMBOL_BLOCK_VALUE (sym) will be filled in later by
21526 SYMBOL_ACLASS_INDEX (sym) = LOC_BLOCK;
21527 SYMBOL_INLINED (sym) = 1;
21528 list_to_add = cu->list_in_scope;
21530 case DW_TAG_template_value_param:
21532 /* Fall through. */
21533 case DW_TAG_constant:
21534 case DW_TAG_variable:
21535 case DW_TAG_member:
21536 /* Compilation with minimal debug info may result in
21537 variables with missing type entries. Change the
21538 misleading `void' type to something sensible. */
21539 if (TYPE_CODE (SYMBOL_TYPE (sym)) == TYPE_CODE_VOID)
21540 SYMBOL_TYPE (sym) = objfile_type (objfile)->builtin_int;
21542 attr = dwarf2_attr (die, DW_AT_const_value, cu);
21543 /* In the case of DW_TAG_member, we should only be called for
21544 static const members. */
21545 if (die->tag == DW_TAG_member)
21547 /* dwarf2_add_field uses die_is_declaration,
21548 so we do the same. */
21549 gdb_assert (die_is_declaration (die, cu));
21554 dwarf2_const_value (attr, sym, cu);
21555 attr2 = dwarf2_attr (die, DW_AT_external, cu);
21558 if (attr2 && (DW_UNSND (attr2) != 0))
21559 list_to_add = cu->get_builder ()->get_global_symbols ();
21561 list_to_add = cu->list_in_scope;
21565 attr = dwarf2_attr (die, DW_AT_location, cu);
21568 var_decode_location (attr, sym, cu);
21569 attr2 = dwarf2_attr (die, DW_AT_external, cu);
21571 /* Fortran explicitly imports any global symbols to the local
21572 scope by DW_TAG_common_block. */
21573 if (cu->language == language_fortran && die->parent
21574 && die->parent->tag == DW_TAG_common_block)
21577 if (SYMBOL_CLASS (sym) == LOC_STATIC
21578 && SYMBOL_VALUE_ADDRESS (sym) == 0
21579 && !dwarf2_per_objfile->has_section_at_zero)
21581 /* When a static variable is eliminated by the linker,
21582 the corresponding debug information is not stripped
21583 out, but the variable address is set to null;
21584 do not add such variables into symbol table. */
21586 else if (attr2 && (DW_UNSND (attr2) != 0))
21588 /* Workaround gfortran PR debug/40040 - it uses
21589 DW_AT_location for variables in -fPIC libraries which may
21590 get overriden by other libraries/executable and get
21591 a different address. Resolve it by the minimal symbol
21592 which may come from inferior's executable using copy
21593 relocation. Make this workaround only for gfortran as for
21594 other compilers GDB cannot guess the minimal symbol
21595 Fortran mangling kind. */
21596 if (cu->language == language_fortran && die->parent
21597 && die->parent->tag == DW_TAG_module
21599 && startswith (cu->producer, "GNU Fortran"))
21600 SYMBOL_ACLASS_INDEX (sym) = LOC_UNRESOLVED;
21602 /* A variable with DW_AT_external is never static,
21603 but it may be block-scoped. */
21605 = ((cu->list_in_scope
21606 == cu->get_builder ()->get_file_symbols ())
21607 ? cu->get_builder ()->get_global_symbols ()
21608 : cu->list_in_scope);
21611 list_to_add = cu->list_in_scope;
21615 /* We do not know the address of this symbol.
21616 If it is an external symbol and we have type information
21617 for it, enter the symbol as a LOC_UNRESOLVED symbol.
21618 The address of the variable will then be determined from
21619 the minimal symbol table whenever the variable is
21621 attr2 = dwarf2_attr (die, DW_AT_external, cu);
21623 /* Fortran explicitly imports any global symbols to the local
21624 scope by DW_TAG_common_block. */
21625 if (cu->language == language_fortran && die->parent
21626 && die->parent->tag == DW_TAG_common_block)
21628 /* SYMBOL_CLASS doesn't matter here because
21629 read_common_block is going to reset it. */
21631 list_to_add = cu->list_in_scope;
21633 else if (attr2 && (DW_UNSND (attr2) != 0)
21634 && dwarf2_attr (die, DW_AT_type, cu) != NULL)
21636 /* A variable with DW_AT_external is never static, but it
21637 may be block-scoped. */
21639 = ((cu->list_in_scope
21640 == cu->get_builder ()->get_file_symbols ())
21641 ? cu->get_builder ()->get_global_symbols ()
21642 : cu->list_in_scope);
21644 SYMBOL_ACLASS_INDEX (sym) = LOC_UNRESOLVED;
21646 else if (!die_is_declaration (die, cu))
21648 /* Use the default LOC_OPTIMIZED_OUT class. */
21649 gdb_assert (SYMBOL_CLASS (sym) == LOC_OPTIMIZED_OUT);
21651 list_to_add = cu->list_in_scope;
21655 case DW_TAG_formal_parameter:
21657 /* If we are inside a function, mark this as an argument. If
21658 not, we might be looking at an argument to an inlined function
21659 when we do not have enough information to show inlined frames;
21660 pretend it's a local variable in that case so that the user can
21662 struct context_stack *curr
21663 = cu->get_builder ()->get_current_context_stack ();
21664 if (curr != nullptr && curr->name != nullptr)
21665 SYMBOL_IS_ARGUMENT (sym) = 1;
21666 attr = dwarf2_attr (die, DW_AT_location, cu);
21669 var_decode_location (attr, sym, cu);
21671 attr = dwarf2_attr (die, DW_AT_const_value, cu);
21674 dwarf2_const_value (attr, sym, cu);
21677 list_to_add = cu->list_in_scope;
21680 case DW_TAG_unspecified_parameters:
21681 /* From varargs functions; gdb doesn't seem to have any
21682 interest in this information, so just ignore it for now.
21685 case DW_TAG_template_type_param:
21687 /* Fall through. */
21688 case DW_TAG_class_type:
21689 case DW_TAG_interface_type:
21690 case DW_TAG_structure_type:
21691 case DW_TAG_union_type:
21692 case DW_TAG_set_type:
21693 case DW_TAG_enumeration_type:
21694 SYMBOL_ACLASS_INDEX (sym) = LOC_TYPEDEF;
21695 SYMBOL_DOMAIN (sym) = STRUCT_DOMAIN;
21698 /* NOTE: carlton/2003-11-10: C++ class symbols shouldn't
21699 really ever be static objects: otherwise, if you try
21700 to, say, break of a class's method and you're in a file
21701 which doesn't mention that class, it won't work unless
21702 the check for all static symbols in lookup_symbol_aux
21703 saves you. See the OtherFileClass tests in
21704 gdb.c++/namespace.exp. */
21708 buildsym_compunit *builder = cu->get_builder ();
21710 = (cu->list_in_scope == builder->get_file_symbols ()
21711 && cu->language == language_cplus
21712 ? builder->get_global_symbols ()
21713 : cu->list_in_scope);
21715 /* The semantics of C++ state that "struct foo {
21716 ... }" also defines a typedef for "foo". */
21717 if (cu->language == language_cplus
21718 || cu->language == language_ada
21719 || cu->language == language_d
21720 || cu->language == language_rust)
21722 /* The symbol's name is already allocated along
21723 with this objfile, so we don't need to
21724 duplicate it for the type. */
21725 if (TYPE_NAME (SYMBOL_TYPE (sym)) == 0)
21726 TYPE_NAME (SYMBOL_TYPE (sym)) = SYMBOL_SEARCH_NAME (sym);
21731 case DW_TAG_typedef:
21732 SYMBOL_ACLASS_INDEX (sym) = LOC_TYPEDEF;
21733 SYMBOL_DOMAIN (sym) = VAR_DOMAIN;
21734 list_to_add = cu->list_in_scope;
21736 case DW_TAG_base_type:
21737 case DW_TAG_subrange_type:
21738 SYMBOL_ACLASS_INDEX (sym) = LOC_TYPEDEF;
21739 SYMBOL_DOMAIN (sym) = VAR_DOMAIN;
21740 list_to_add = cu->list_in_scope;
21742 case DW_TAG_enumerator:
21743 attr = dwarf2_attr (die, DW_AT_const_value, cu);
21746 dwarf2_const_value (attr, sym, cu);
21749 /* NOTE: carlton/2003-11-10: See comment above in the
21750 DW_TAG_class_type, etc. block. */
21753 = (cu->list_in_scope == cu->get_builder ()->get_file_symbols ()
21754 && cu->language == language_cplus
21755 ? cu->get_builder ()->get_global_symbols ()
21756 : cu->list_in_scope);
21759 case DW_TAG_imported_declaration:
21760 case DW_TAG_namespace:
21761 SYMBOL_ACLASS_INDEX (sym) = LOC_TYPEDEF;
21762 list_to_add = cu->get_builder ()->get_global_symbols ();
21764 case DW_TAG_module:
21765 SYMBOL_ACLASS_INDEX (sym) = LOC_TYPEDEF;
21766 SYMBOL_DOMAIN (sym) = MODULE_DOMAIN;
21767 list_to_add = cu->get_builder ()->get_global_symbols ();
21769 case DW_TAG_common_block:
21770 SYMBOL_ACLASS_INDEX (sym) = LOC_COMMON_BLOCK;
21771 SYMBOL_DOMAIN (sym) = COMMON_BLOCK_DOMAIN;
21772 add_symbol_to_list (sym, cu->list_in_scope);
21775 /* Not a tag we recognize. Hopefully we aren't processing
21776 trash data, but since we must specifically ignore things
21777 we don't recognize, there is nothing else we should do at
21779 complaint (_("unsupported tag: '%s'"),
21780 dwarf_tag_name (die->tag));
21786 sym->hash_next = objfile->template_symbols;
21787 objfile->template_symbols = sym;
21788 list_to_add = NULL;
21791 if (list_to_add != NULL)
21792 add_symbol_to_list (sym, list_to_add);
21794 /* For the benefit of old versions of GCC, check for anonymous
21795 namespaces based on the demangled name. */
21796 if (!cu->processing_has_namespace_info
21797 && cu->language == language_cplus)
21798 cp_scan_for_anonymous_namespaces (cu->get_builder (), sym, objfile);
21803 /* Given an attr with a DW_FORM_dataN value in host byte order,
21804 zero-extend it as appropriate for the symbol's type. The DWARF
21805 standard (v4) is not entirely clear about the meaning of using
21806 DW_FORM_dataN for a constant with a signed type, where the type is
21807 wider than the data. The conclusion of a discussion on the DWARF
21808 list was that this is unspecified. We choose to always zero-extend
21809 because that is the interpretation long in use by GCC. */
21812 dwarf2_const_value_data (const struct attribute *attr, struct obstack *obstack,
21813 struct dwarf2_cu *cu, LONGEST *value, int bits)
21815 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
21816 enum bfd_endian byte_order = bfd_big_endian (objfile->obfd) ?
21817 BFD_ENDIAN_BIG : BFD_ENDIAN_LITTLE;
21818 LONGEST l = DW_UNSND (attr);
21820 if (bits < sizeof (*value) * 8)
21822 l &= ((LONGEST) 1 << bits) - 1;
21825 else if (bits == sizeof (*value) * 8)
21829 gdb_byte *bytes = (gdb_byte *) obstack_alloc (obstack, bits / 8);
21830 store_unsigned_integer (bytes, bits / 8, byte_order, l);
21837 /* Read a constant value from an attribute. Either set *VALUE, or if
21838 the value does not fit in *VALUE, set *BYTES - either already
21839 allocated on the objfile obstack, or newly allocated on OBSTACK,
21840 or, set *BATON, if we translated the constant to a location
21844 dwarf2_const_value_attr (const struct attribute *attr, struct type *type,
21845 const char *name, struct obstack *obstack,
21846 struct dwarf2_cu *cu,
21847 LONGEST *value, const gdb_byte **bytes,
21848 struct dwarf2_locexpr_baton **baton)
21850 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
21851 struct comp_unit_head *cu_header = &cu->header;
21852 struct dwarf_block *blk;
21853 enum bfd_endian byte_order = (bfd_big_endian (objfile->obfd) ?
21854 BFD_ENDIAN_BIG : BFD_ENDIAN_LITTLE);
21860 switch (attr->form)
21863 case DW_FORM_addrx:
21864 case DW_FORM_GNU_addr_index:
21868 if (TYPE_LENGTH (type) != cu_header->addr_size)
21869 dwarf2_const_value_length_mismatch_complaint (name,
21870 cu_header->addr_size,
21871 TYPE_LENGTH (type));
21872 /* Symbols of this form are reasonably rare, so we just
21873 piggyback on the existing location code rather than writing
21874 a new implementation of symbol_computed_ops. */
21875 *baton = XOBNEW (obstack, struct dwarf2_locexpr_baton);
21876 (*baton)->per_cu = cu->per_cu;
21877 gdb_assert ((*baton)->per_cu);
21879 (*baton)->size = 2 + cu_header->addr_size;
21880 data = (gdb_byte *) obstack_alloc (obstack, (*baton)->size);
21881 (*baton)->data = data;
21883 data[0] = DW_OP_addr;
21884 store_unsigned_integer (&data[1], cu_header->addr_size,
21885 byte_order, DW_ADDR (attr));
21886 data[cu_header->addr_size + 1] = DW_OP_stack_value;
21889 case DW_FORM_string:
21891 case DW_FORM_GNU_str_index:
21892 case DW_FORM_GNU_strp_alt:
21893 /* DW_STRING is already allocated on the objfile obstack, point
21895 *bytes = (const gdb_byte *) DW_STRING (attr);
21897 case DW_FORM_block1:
21898 case DW_FORM_block2:
21899 case DW_FORM_block4:
21900 case DW_FORM_block:
21901 case DW_FORM_exprloc:
21902 case DW_FORM_data16:
21903 blk = DW_BLOCK (attr);
21904 if (TYPE_LENGTH (type) != blk->size)
21905 dwarf2_const_value_length_mismatch_complaint (name, blk->size,
21906 TYPE_LENGTH (type));
21907 *bytes = blk->data;
21910 /* The DW_AT_const_value attributes are supposed to carry the
21911 symbol's value "represented as it would be on the target
21912 architecture." By the time we get here, it's already been
21913 converted to host endianness, so we just need to sign- or
21914 zero-extend it as appropriate. */
21915 case DW_FORM_data1:
21916 *bytes = dwarf2_const_value_data (attr, obstack, cu, value, 8);
21918 case DW_FORM_data2:
21919 *bytes = dwarf2_const_value_data (attr, obstack, cu, value, 16);
21921 case DW_FORM_data4:
21922 *bytes = dwarf2_const_value_data (attr, obstack, cu, value, 32);
21924 case DW_FORM_data8:
21925 *bytes = dwarf2_const_value_data (attr, obstack, cu, value, 64);
21928 case DW_FORM_sdata:
21929 case DW_FORM_implicit_const:
21930 *value = DW_SND (attr);
21933 case DW_FORM_udata:
21934 *value = DW_UNSND (attr);
21938 complaint (_("unsupported const value attribute form: '%s'"),
21939 dwarf_form_name (attr->form));
21946 /* Copy constant value from an attribute to a symbol. */
21949 dwarf2_const_value (const struct attribute *attr, struct symbol *sym,
21950 struct dwarf2_cu *cu)
21952 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
21954 const gdb_byte *bytes;
21955 struct dwarf2_locexpr_baton *baton;
21957 dwarf2_const_value_attr (attr, SYMBOL_TYPE (sym),
21958 SYMBOL_PRINT_NAME (sym),
21959 &objfile->objfile_obstack, cu,
21960 &value, &bytes, &baton);
21964 SYMBOL_LOCATION_BATON (sym) = baton;
21965 SYMBOL_ACLASS_INDEX (sym) = dwarf2_locexpr_index;
21967 else if (bytes != NULL)
21969 SYMBOL_VALUE_BYTES (sym) = bytes;
21970 SYMBOL_ACLASS_INDEX (sym) = LOC_CONST_BYTES;
21974 SYMBOL_VALUE (sym) = value;
21975 SYMBOL_ACLASS_INDEX (sym) = LOC_CONST;
21979 /* Return the type of the die in question using its DW_AT_type attribute. */
21981 static struct type *
21982 die_type (struct die_info *die, struct dwarf2_cu *cu)
21984 struct attribute *type_attr;
21986 type_attr = dwarf2_attr (die, DW_AT_type, cu);
21989 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
21990 /* A missing DW_AT_type represents a void type. */
21991 return objfile_type (objfile)->builtin_void;
21994 return lookup_die_type (die, type_attr, cu);
21997 /* True iff CU's producer generates GNAT Ada auxiliary information
21998 that allows to find parallel types through that information instead
21999 of having to do expensive parallel lookups by type name. */
22002 need_gnat_info (struct dwarf2_cu *cu)
22004 /* Assume that the Ada compiler was GNAT, which always produces
22005 the auxiliary information. */
22006 return (cu->language == language_ada);
22009 /* Return the auxiliary type of the die in question using its
22010 DW_AT_GNAT_descriptive_type attribute. Returns NULL if the
22011 attribute is not present. */
22013 static struct type *
22014 die_descriptive_type (struct die_info *die, struct dwarf2_cu *cu)
22016 struct attribute *type_attr;
22018 type_attr = dwarf2_attr (die, DW_AT_GNAT_descriptive_type, cu);
22022 return lookup_die_type (die, type_attr, cu);
22025 /* If DIE has a descriptive_type attribute, then set the TYPE's
22026 descriptive type accordingly. */
22029 set_descriptive_type (struct type *type, struct die_info *die,
22030 struct dwarf2_cu *cu)
22032 struct type *descriptive_type = die_descriptive_type (die, cu);
22034 if (descriptive_type)
22036 ALLOCATE_GNAT_AUX_TYPE (type);
22037 TYPE_DESCRIPTIVE_TYPE (type) = descriptive_type;
22041 /* Return the containing type of the die in question using its
22042 DW_AT_containing_type attribute. */
22044 static struct type *
22045 die_containing_type (struct die_info *die, struct dwarf2_cu *cu)
22047 struct attribute *type_attr;
22048 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
22050 type_attr = dwarf2_attr (die, DW_AT_containing_type, cu);
22052 error (_("Dwarf Error: Problem turning containing type into gdb type "
22053 "[in module %s]"), objfile_name (objfile));
22055 return lookup_die_type (die, type_attr, cu);
22058 /* Return an error marker type to use for the ill formed type in DIE/CU. */
22060 static struct type *
22061 build_error_marker_type (struct dwarf2_cu *cu, struct die_info *die)
22063 struct dwarf2_per_objfile *dwarf2_per_objfile
22064 = cu->per_cu->dwarf2_per_objfile;
22065 struct objfile *objfile = dwarf2_per_objfile->objfile;
22068 std::string message
22069 = string_printf (_("<unknown type in %s, CU %s, DIE %s>"),
22070 objfile_name (objfile),
22071 sect_offset_str (cu->header.sect_off),
22072 sect_offset_str (die->sect_off));
22073 saved = (char *) obstack_copy0 (&objfile->objfile_obstack,
22074 message.c_str (), message.length ());
22076 return init_type (objfile, TYPE_CODE_ERROR, 0, saved);
22079 /* Look up the type of DIE in CU using its type attribute ATTR.
22080 ATTR must be one of: DW_AT_type, DW_AT_GNAT_descriptive_type,
22081 DW_AT_containing_type.
22082 If there is no type substitute an error marker. */
22084 static struct type *
22085 lookup_die_type (struct die_info *die, const struct attribute *attr,
22086 struct dwarf2_cu *cu)
22088 struct dwarf2_per_objfile *dwarf2_per_objfile
22089 = cu->per_cu->dwarf2_per_objfile;
22090 struct objfile *objfile = dwarf2_per_objfile->objfile;
22091 struct type *this_type;
22093 gdb_assert (attr->name == DW_AT_type
22094 || attr->name == DW_AT_GNAT_descriptive_type
22095 || attr->name == DW_AT_containing_type);
22097 /* First see if we have it cached. */
22099 if (attr->form == DW_FORM_GNU_ref_alt)
22101 struct dwarf2_per_cu_data *per_cu;
22102 sect_offset sect_off = dwarf2_get_ref_die_offset (attr);
22104 per_cu = dwarf2_find_containing_comp_unit (sect_off, 1,
22105 dwarf2_per_objfile);
22106 this_type = get_die_type_at_offset (sect_off, per_cu);
22108 else if (attr_form_is_ref (attr))
22110 sect_offset sect_off = dwarf2_get_ref_die_offset (attr);
22112 this_type = get_die_type_at_offset (sect_off, cu->per_cu);
22114 else if (attr->form == DW_FORM_ref_sig8)
22116 ULONGEST signature = DW_SIGNATURE (attr);
22118 return get_signatured_type (die, signature, cu);
22122 complaint (_("Dwarf Error: Bad type attribute %s in DIE"
22123 " at %s [in module %s]"),
22124 dwarf_attr_name (attr->name), sect_offset_str (die->sect_off),
22125 objfile_name (objfile));
22126 return build_error_marker_type (cu, die);
22129 /* If not cached we need to read it in. */
22131 if (this_type == NULL)
22133 struct die_info *type_die = NULL;
22134 struct dwarf2_cu *type_cu = cu;
22136 if (attr_form_is_ref (attr))
22137 type_die = follow_die_ref (die, attr, &type_cu);
22138 if (type_die == NULL)
22139 return build_error_marker_type (cu, die);
22140 /* If we find the type now, it's probably because the type came
22141 from an inter-CU reference and the type's CU got expanded before
22143 this_type = read_type_die (type_die, type_cu);
22146 /* If we still don't have a type use an error marker. */
22148 if (this_type == NULL)
22149 return build_error_marker_type (cu, die);
22154 /* Return the type in DIE, CU.
22155 Returns NULL for invalid types.
22157 This first does a lookup in die_type_hash,
22158 and only reads the die in if necessary.
22160 NOTE: This can be called when reading in partial or full symbols. */
22162 static struct type *
22163 read_type_die (struct die_info *die, struct dwarf2_cu *cu)
22165 struct type *this_type;
22167 this_type = get_die_type (die, cu);
22171 return read_type_die_1 (die, cu);
22174 /* Read the type in DIE, CU.
22175 Returns NULL for invalid types. */
22177 static struct type *
22178 read_type_die_1 (struct die_info *die, struct dwarf2_cu *cu)
22180 struct type *this_type = NULL;
22184 case DW_TAG_class_type:
22185 case DW_TAG_interface_type:
22186 case DW_TAG_structure_type:
22187 case DW_TAG_union_type:
22188 this_type = read_structure_type (die, cu);
22190 case DW_TAG_enumeration_type:
22191 this_type = read_enumeration_type (die, cu);
22193 case DW_TAG_subprogram:
22194 case DW_TAG_subroutine_type:
22195 case DW_TAG_inlined_subroutine:
22196 this_type = read_subroutine_type (die, cu);
22198 case DW_TAG_array_type:
22199 this_type = read_array_type (die, cu);
22201 case DW_TAG_set_type:
22202 this_type = read_set_type (die, cu);
22204 case DW_TAG_pointer_type:
22205 this_type = read_tag_pointer_type (die, cu);
22207 case DW_TAG_ptr_to_member_type:
22208 this_type = read_tag_ptr_to_member_type (die, cu);
22210 case DW_TAG_reference_type:
22211 this_type = read_tag_reference_type (die, cu, TYPE_CODE_REF);
22213 case DW_TAG_rvalue_reference_type:
22214 this_type = read_tag_reference_type (die, cu, TYPE_CODE_RVALUE_REF);
22216 case DW_TAG_const_type:
22217 this_type = read_tag_const_type (die, cu);
22219 case DW_TAG_volatile_type:
22220 this_type = read_tag_volatile_type (die, cu);
22222 case DW_TAG_restrict_type:
22223 this_type = read_tag_restrict_type (die, cu);
22225 case DW_TAG_string_type:
22226 this_type = read_tag_string_type (die, cu);
22228 case DW_TAG_typedef:
22229 this_type = read_typedef (die, cu);
22231 case DW_TAG_subrange_type:
22232 this_type = read_subrange_type (die, cu);
22234 case DW_TAG_base_type:
22235 this_type = read_base_type (die, cu);
22237 case DW_TAG_unspecified_type:
22238 this_type = read_unspecified_type (die, cu);
22240 case DW_TAG_namespace:
22241 this_type = read_namespace_type (die, cu);
22243 case DW_TAG_module:
22244 this_type = read_module_type (die, cu);
22246 case DW_TAG_atomic_type:
22247 this_type = read_tag_atomic_type (die, cu);
22250 complaint (_("unexpected tag in read_type_die: '%s'"),
22251 dwarf_tag_name (die->tag));
22258 /* See if we can figure out if the class lives in a namespace. We do
22259 this by looking for a member function; its demangled name will
22260 contain namespace info, if there is any.
22261 Return the computed name or NULL.
22262 Space for the result is allocated on the objfile's obstack.
22263 This is the full-die version of guess_partial_die_structure_name.
22264 In this case we know DIE has no useful parent. */
22267 guess_full_die_structure_name (struct die_info *die, struct dwarf2_cu *cu)
22269 struct die_info *spec_die;
22270 struct dwarf2_cu *spec_cu;
22271 struct die_info *child;
22272 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
22275 spec_die = die_specification (die, &spec_cu);
22276 if (spec_die != NULL)
22282 for (child = die->child;
22284 child = child->sibling)
22286 if (child->tag == DW_TAG_subprogram)
22288 const char *linkage_name = dw2_linkage_name (child, cu);
22290 if (linkage_name != NULL)
22293 = language_class_name_from_physname (cu->language_defn,
22297 if (actual_name != NULL)
22299 const char *die_name = dwarf2_name (die, cu);
22301 if (die_name != NULL
22302 && strcmp (die_name, actual_name) != 0)
22304 /* Strip off the class name from the full name.
22305 We want the prefix. */
22306 int die_name_len = strlen (die_name);
22307 int actual_name_len = strlen (actual_name);
22309 /* Test for '::' as a sanity check. */
22310 if (actual_name_len > die_name_len + 2
22311 && actual_name[actual_name_len
22312 - die_name_len - 1] == ':')
22313 name = (char *) obstack_copy0 (
22314 &objfile->per_bfd->storage_obstack,
22315 actual_name, actual_name_len - die_name_len - 2);
22318 xfree (actual_name);
22327 /* GCC might emit a nameless typedef that has a linkage name. Determine the
22328 prefix part in such case. See
22329 http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47510. */
22331 static const char *
22332 anonymous_struct_prefix (struct die_info *die, struct dwarf2_cu *cu)
22334 struct attribute *attr;
22337 if (die->tag != DW_TAG_class_type && die->tag != DW_TAG_interface_type
22338 && die->tag != DW_TAG_structure_type && die->tag != DW_TAG_union_type)
22341 if (dwarf2_string_attr (die, DW_AT_name, cu) != NULL)
22344 attr = dw2_linkage_name_attr (die, cu);
22345 if (attr == NULL || DW_STRING (attr) == NULL)
22348 /* dwarf2_name had to be already called. */
22349 gdb_assert (DW_STRING_IS_CANONICAL (attr));
22351 /* Strip the base name, keep any leading namespaces/classes. */
22352 base = strrchr (DW_STRING (attr), ':');
22353 if (base == NULL || base == DW_STRING (attr) || base[-1] != ':')
22356 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
22357 return (char *) obstack_copy0 (&objfile->per_bfd->storage_obstack,
22359 &base[-1] - DW_STRING (attr));
22362 /* Return the name of the namespace/class that DIE is defined within,
22363 or "" if we can't tell. The caller should not xfree the result.
22365 For example, if we're within the method foo() in the following
22375 then determine_prefix on foo's die will return "N::C". */
22377 static const char *
22378 determine_prefix (struct die_info *die, struct dwarf2_cu *cu)
22380 struct dwarf2_per_objfile *dwarf2_per_objfile
22381 = cu->per_cu->dwarf2_per_objfile;
22382 struct die_info *parent, *spec_die;
22383 struct dwarf2_cu *spec_cu;
22384 struct type *parent_type;
22385 const char *retval;
22387 if (cu->language != language_cplus
22388 && cu->language != language_fortran && cu->language != language_d
22389 && cu->language != language_rust)
22392 retval = anonymous_struct_prefix (die, cu);
22396 /* We have to be careful in the presence of DW_AT_specification.
22397 For example, with GCC 3.4, given the code
22401 // Definition of N::foo.
22405 then we'll have a tree of DIEs like this:
22407 1: DW_TAG_compile_unit
22408 2: DW_TAG_namespace // N
22409 3: DW_TAG_subprogram // declaration of N::foo
22410 4: DW_TAG_subprogram // definition of N::foo
22411 DW_AT_specification // refers to die #3
22413 Thus, when processing die #4, we have to pretend that we're in
22414 the context of its DW_AT_specification, namely the contex of die
22417 spec_die = die_specification (die, &spec_cu);
22418 if (spec_die == NULL)
22419 parent = die->parent;
22422 parent = spec_die->parent;
22426 if (parent == NULL)
22428 else if (parent->building_fullname)
22431 const char *parent_name;
22433 /* It has been seen on RealView 2.2 built binaries,
22434 DW_TAG_template_type_param types actually _defined_ as
22435 children of the parent class:
22438 template class <class Enum> Class{};
22439 Class<enum E> class_e;
22441 1: DW_TAG_class_type (Class)
22442 2: DW_TAG_enumeration_type (E)
22443 3: DW_TAG_enumerator (enum1:0)
22444 3: DW_TAG_enumerator (enum2:1)
22446 2: DW_TAG_template_type_param
22447 DW_AT_type DW_FORM_ref_udata (E)
22449 Besides being broken debug info, it can put GDB into an
22450 infinite loop. Consider:
22452 When we're building the full name for Class<E>, we'll start
22453 at Class, and go look over its template type parameters,
22454 finding E. We'll then try to build the full name of E, and
22455 reach here. We're now trying to build the full name of E,
22456 and look over the parent DIE for containing scope. In the
22457 broken case, if we followed the parent DIE of E, we'd again
22458 find Class, and once again go look at its template type
22459 arguments, etc., etc. Simply don't consider such parent die
22460 as source-level parent of this die (it can't be, the language
22461 doesn't allow it), and break the loop here. */
22462 name = dwarf2_name (die, cu);
22463 parent_name = dwarf2_name (parent, cu);
22464 complaint (_("template param type '%s' defined within parent '%s'"),
22465 name ? name : "<unknown>",
22466 parent_name ? parent_name : "<unknown>");
22470 switch (parent->tag)
22472 case DW_TAG_namespace:
22473 parent_type = read_type_die (parent, cu);
22474 /* GCC 4.0 and 4.1 had a bug (PR c++/28460) where they generated bogus
22475 DW_TAG_namespace DIEs with a name of "::" for the global namespace.
22476 Work around this problem here. */
22477 if (cu->language == language_cplus
22478 && strcmp (TYPE_NAME (parent_type), "::") == 0)
22480 /* We give a name to even anonymous namespaces. */
22481 return TYPE_NAME (parent_type);
22482 case DW_TAG_class_type:
22483 case DW_TAG_interface_type:
22484 case DW_TAG_structure_type:
22485 case DW_TAG_union_type:
22486 case DW_TAG_module:
22487 parent_type = read_type_die (parent, cu);
22488 if (TYPE_NAME (parent_type) != NULL)
22489 return TYPE_NAME (parent_type);
22491 /* An anonymous structure is only allowed non-static data
22492 members; no typedefs, no member functions, et cetera.
22493 So it does not need a prefix. */
22495 case DW_TAG_compile_unit:
22496 case DW_TAG_partial_unit:
22497 /* gcc-4.5 -gdwarf-4 can drop the enclosing namespace. Cope. */
22498 if (cu->language == language_cplus
22499 && !VEC_empty (dwarf2_section_info_def, dwarf2_per_objfile->types)
22500 && die->child != NULL
22501 && (die->tag == DW_TAG_class_type
22502 || die->tag == DW_TAG_structure_type
22503 || die->tag == DW_TAG_union_type))
22505 char *name = guess_full_die_structure_name (die, cu);
22510 case DW_TAG_enumeration_type:
22511 parent_type = read_type_die (parent, cu);
22512 if (TYPE_DECLARED_CLASS (parent_type))
22514 if (TYPE_NAME (parent_type) != NULL)
22515 return TYPE_NAME (parent_type);
22518 /* Fall through. */
22520 return determine_prefix (parent, cu);
22524 /* Return a newly-allocated string formed by concatenating PREFIX and SUFFIX
22525 with appropriate separator. If PREFIX or SUFFIX is NULL or empty, then
22526 simply copy the SUFFIX or PREFIX, respectively. If OBS is non-null, perform
22527 an obconcat, otherwise allocate storage for the result. The CU argument is
22528 used to determine the language and hence, the appropriate separator. */
22530 #define MAX_SEP_LEN 7 /* strlen ("__") + strlen ("_MOD_") */
22533 typename_concat (struct obstack *obs, const char *prefix, const char *suffix,
22534 int physname, struct dwarf2_cu *cu)
22536 const char *lead = "";
22539 if (suffix == NULL || suffix[0] == '\0'
22540 || prefix == NULL || prefix[0] == '\0')
22542 else if (cu->language == language_d)
22544 /* For D, the 'main' function could be defined in any module, but it
22545 should never be prefixed. */
22546 if (strcmp (suffix, "D main") == 0)
22554 else if (cu->language == language_fortran && physname)
22556 /* This is gfortran specific mangling. Normally DW_AT_linkage_name or
22557 DW_AT_MIPS_linkage_name is preferred and used instead. */
22565 if (prefix == NULL)
22567 if (suffix == NULL)
22574 xmalloc (strlen (prefix) + MAX_SEP_LEN + strlen (suffix) + 1));
22576 strcpy (retval, lead);
22577 strcat (retval, prefix);
22578 strcat (retval, sep);
22579 strcat (retval, suffix);
22584 /* We have an obstack. */
22585 return obconcat (obs, lead, prefix, sep, suffix, (char *) NULL);
22589 /* Return sibling of die, NULL if no sibling. */
22591 static struct die_info *
22592 sibling_die (struct die_info *die)
22594 return die->sibling;
22597 /* Get name of a die, return NULL if not found. */
22599 static const char *
22600 dwarf2_canonicalize_name (const char *name, struct dwarf2_cu *cu,
22601 struct obstack *obstack)
22603 if (name && cu->language == language_cplus)
22605 std::string canon_name = cp_canonicalize_string (name);
22607 if (!canon_name.empty ())
22609 if (canon_name != name)
22610 name = (const char *) obstack_copy0 (obstack,
22611 canon_name.c_str (),
22612 canon_name.length ());
22619 /* Get name of a die, return NULL if not found.
22620 Anonymous namespaces are converted to their magic string. */
22622 static const char *
22623 dwarf2_name (struct die_info *die, struct dwarf2_cu *cu)
22625 struct attribute *attr;
22626 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
22628 attr = dwarf2_attr (die, DW_AT_name, cu);
22629 if ((!attr || !DW_STRING (attr))
22630 && die->tag != DW_TAG_namespace
22631 && die->tag != DW_TAG_class_type
22632 && die->tag != DW_TAG_interface_type
22633 && die->tag != DW_TAG_structure_type
22634 && die->tag != DW_TAG_union_type)
22639 case DW_TAG_compile_unit:
22640 case DW_TAG_partial_unit:
22641 /* Compilation units have a DW_AT_name that is a filename, not
22642 a source language identifier. */
22643 case DW_TAG_enumeration_type:
22644 case DW_TAG_enumerator:
22645 /* These tags always have simple identifiers already; no need
22646 to canonicalize them. */
22647 return DW_STRING (attr);
22649 case DW_TAG_namespace:
22650 if (attr != NULL && DW_STRING (attr) != NULL)
22651 return DW_STRING (attr);
22652 return CP_ANONYMOUS_NAMESPACE_STR;
22654 case DW_TAG_class_type:
22655 case DW_TAG_interface_type:
22656 case DW_TAG_structure_type:
22657 case DW_TAG_union_type:
22658 /* Some GCC versions emit spurious DW_AT_name attributes for unnamed
22659 structures or unions. These were of the form "._%d" in GCC 4.1,
22660 or simply "<anonymous struct>" or "<anonymous union>" in GCC 4.3
22661 and GCC 4.4. We work around this problem by ignoring these. */
22662 if (attr && DW_STRING (attr)
22663 && (startswith (DW_STRING (attr), "._")
22664 || startswith (DW_STRING (attr), "<anonymous")))
22667 /* GCC might emit a nameless typedef that has a linkage name. See
22668 http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47510. */
22669 if (!attr || DW_STRING (attr) == NULL)
22671 char *demangled = NULL;
22673 attr = dw2_linkage_name_attr (die, cu);
22674 if (attr == NULL || DW_STRING (attr) == NULL)
22677 /* Avoid demangling DW_STRING (attr) the second time on a second
22678 call for the same DIE. */
22679 if (!DW_STRING_IS_CANONICAL (attr))
22680 demangled = gdb_demangle (DW_STRING (attr), DMGL_TYPES);
22686 /* FIXME: we already did this for the partial symbol... */
22689 obstack_copy0 (&objfile->per_bfd->storage_obstack,
22690 demangled, strlen (demangled)));
22691 DW_STRING_IS_CANONICAL (attr) = 1;
22694 /* Strip any leading namespaces/classes, keep only the base name.
22695 DW_AT_name for named DIEs does not contain the prefixes. */
22696 base = strrchr (DW_STRING (attr), ':');
22697 if (base && base > DW_STRING (attr) && base[-1] == ':')
22700 return DW_STRING (attr);
22709 if (!DW_STRING_IS_CANONICAL (attr))
22712 = dwarf2_canonicalize_name (DW_STRING (attr), cu,
22713 &objfile->per_bfd->storage_obstack);
22714 DW_STRING_IS_CANONICAL (attr) = 1;
22716 return DW_STRING (attr);
22719 /* Return the die that this die in an extension of, or NULL if there
22720 is none. *EXT_CU is the CU containing DIE on input, and the CU
22721 containing the return value on output. */
22723 static struct die_info *
22724 dwarf2_extension (struct die_info *die, struct dwarf2_cu **ext_cu)
22726 struct attribute *attr;
22728 attr = dwarf2_attr (die, DW_AT_extension, *ext_cu);
22732 return follow_die_ref (die, attr, ext_cu);
22735 /* Convert a DIE tag into its string name. */
22737 static const char *
22738 dwarf_tag_name (unsigned tag)
22740 const char *name = get_DW_TAG_name (tag);
22743 return "DW_TAG_<unknown>";
22748 /* Convert a DWARF attribute code into its string name. */
22750 static const char *
22751 dwarf_attr_name (unsigned attr)
22755 #ifdef MIPS /* collides with DW_AT_HP_block_index */
22756 if (attr == DW_AT_MIPS_fde)
22757 return "DW_AT_MIPS_fde";
22759 if (attr == DW_AT_HP_block_index)
22760 return "DW_AT_HP_block_index";
22763 name = get_DW_AT_name (attr);
22766 return "DW_AT_<unknown>";
22771 /* Convert a DWARF value form code into its string name. */
22773 static const char *
22774 dwarf_form_name (unsigned form)
22776 const char *name = get_DW_FORM_name (form);
22779 return "DW_FORM_<unknown>";
22784 static const char *
22785 dwarf_bool_name (unsigned mybool)
22793 /* Convert a DWARF type code into its string name. */
22795 static const char *
22796 dwarf_type_encoding_name (unsigned enc)
22798 const char *name = get_DW_ATE_name (enc);
22801 return "DW_ATE_<unknown>";
22807 dump_die_shallow (struct ui_file *f, int indent, struct die_info *die)
22811 print_spaces (indent, f);
22812 fprintf_unfiltered (f, "Die: %s (abbrev %d, offset %s)\n",
22813 dwarf_tag_name (die->tag), die->abbrev,
22814 sect_offset_str (die->sect_off));
22816 if (die->parent != NULL)
22818 print_spaces (indent, f);
22819 fprintf_unfiltered (f, " parent at offset: %s\n",
22820 sect_offset_str (die->parent->sect_off));
22823 print_spaces (indent, f);
22824 fprintf_unfiltered (f, " has children: %s\n",
22825 dwarf_bool_name (die->child != NULL));
22827 print_spaces (indent, f);
22828 fprintf_unfiltered (f, " attributes:\n");
22830 for (i = 0; i < die->num_attrs; ++i)
22832 print_spaces (indent, f);
22833 fprintf_unfiltered (f, " %s (%s) ",
22834 dwarf_attr_name (die->attrs[i].name),
22835 dwarf_form_name (die->attrs[i].form));
22837 switch (die->attrs[i].form)
22840 case DW_FORM_addrx:
22841 case DW_FORM_GNU_addr_index:
22842 fprintf_unfiltered (f, "address: ");
22843 fputs_filtered (hex_string (DW_ADDR (&die->attrs[i])), f);
22845 case DW_FORM_block2:
22846 case DW_FORM_block4:
22847 case DW_FORM_block:
22848 case DW_FORM_block1:
22849 fprintf_unfiltered (f, "block: size %s",
22850 pulongest (DW_BLOCK (&die->attrs[i])->size));
22852 case DW_FORM_exprloc:
22853 fprintf_unfiltered (f, "expression: size %s",
22854 pulongest (DW_BLOCK (&die->attrs[i])->size));
22856 case DW_FORM_data16:
22857 fprintf_unfiltered (f, "constant of 16 bytes");
22859 case DW_FORM_ref_addr:
22860 fprintf_unfiltered (f, "ref address: ");
22861 fputs_filtered (hex_string (DW_UNSND (&die->attrs[i])), f);
22863 case DW_FORM_GNU_ref_alt:
22864 fprintf_unfiltered (f, "alt ref address: ");
22865 fputs_filtered (hex_string (DW_UNSND (&die->attrs[i])), f);
22871 case DW_FORM_ref_udata:
22872 fprintf_unfiltered (f, "constant ref: 0x%lx (adjusted)",
22873 (long) (DW_UNSND (&die->attrs[i])));
22875 case DW_FORM_data1:
22876 case DW_FORM_data2:
22877 case DW_FORM_data4:
22878 case DW_FORM_data8:
22879 case DW_FORM_udata:
22880 case DW_FORM_sdata:
22881 fprintf_unfiltered (f, "constant: %s",
22882 pulongest (DW_UNSND (&die->attrs[i])));
22884 case DW_FORM_sec_offset:
22885 fprintf_unfiltered (f, "section offset: %s",
22886 pulongest (DW_UNSND (&die->attrs[i])));
22888 case DW_FORM_ref_sig8:
22889 fprintf_unfiltered (f, "signature: %s",
22890 hex_string (DW_SIGNATURE (&die->attrs[i])));
22892 case DW_FORM_string:
22894 case DW_FORM_line_strp:
22895 case DW_FORM_GNU_str_index:
22896 case DW_FORM_GNU_strp_alt:
22897 fprintf_unfiltered (f, "string: \"%s\" (%s canonicalized)",
22898 DW_STRING (&die->attrs[i])
22899 ? DW_STRING (&die->attrs[i]) : "",
22900 DW_STRING_IS_CANONICAL (&die->attrs[i]) ? "is" : "not");
22903 if (DW_UNSND (&die->attrs[i]))
22904 fprintf_unfiltered (f, "flag: TRUE");
22906 fprintf_unfiltered (f, "flag: FALSE");
22908 case DW_FORM_flag_present:
22909 fprintf_unfiltered (f, "flag: TRUE");
22911 case DW_FORM_indirect:
22912 /* The reader will have reduced the indirect form to
22913 the "base form" so this form should not occur. */
22914 fprintf_unfiltered (f,
22915 "unexpected attribute form: DW_FORM_indirect");
22917 case DW_FORM_implicit_const:
22918 fprintf_unfiltered (f, "constant: %s",
22919 plongest (DW_SND (&die->attrs[i])));
22922 fprintf_unfiltered (f, "unsupported attribute form: %d.",
22923 die->attrs[i].form);
22926 fprintf_unfiltered (f, "\n");
22931 dump_die_for_error (struct die_info *die)
22933 dump_die_shallow (gdb_stderr, 0, die);
22937 dump_die_1 (struct ui_file *f, int level, int max_level, struct die_info *die)
22939 int indent = level * 4;
22941 gdb_assert (die != NULL);
22943 if (level >= max_level)
22946 dump_die_shallow (f, indent, die);
22948 if (die->child != NULL)
22950 print_spaces (indent, f);
22951 fprintf_unfiltered (f, " Children:");
22952 if (level + 1 < max_level)
22954 fprintf_unfiltered (f, "\n");
22955 dump_die_1 (f, level + 1, max_level, die->child);
22959 fprintf_unfiltered (f,
22960 " [not printed, max nesting level reached]\n");
22964 if (die->sibling != NULL && level > 0)
22966 dump_die_1 (f, level, max_level, die->sibling);
22970 /* This is called from the pdie macro in gdbinit.in.
22971 It's not static so gcc will keep a copy callable from gdb. */
22974 dump_die (struct die_info *die, int max_level)
22976 dump_die_1 (gdb_stdlog, 0, max_level, die);
22980 store_in_ref_table (struct die_info *die, struct dwarf2_cu *cu)
22984 slot = htab_find_slot_with_hash (cu->die_hash, die,
22985 to_underlying (die->sect_off),
22991 /* Return DIE offset of ATTR. Return 0 with complaint if ATTR is not of the
22995 dwarf2_get_ref_die_offset (const struct attribute *attr)
22997 if (attr_form_is_ref (attr))
22998 return (sect_offset) DW_UNSND (attr);
23000 complaint (_("unsupported die ref attribute form: '%s'"),
23001 dwarf_form_name (attr->form));
23005 /* Return the constant value held by ATTR. Return DEFAULT_VALUE if
23006 * the value held by the attribute is not constant. */
23009 dwarf2_get_attr_constant_value (const struct attribute *attr, int default_value)
23011 if (attr->form == DW_FORM_sdata || attr->form == DW_FORM_implicit_const)
23012 return DW_SND (attr);
23013 else if (attr->form == DW_FORM_udata
23014 || attr->form == DW_FORM_data1
23015 || attr->form == DW_FORM_data2
23016 || attr->form == DW_FORM_data4
23017 || attr->form == DW_FORM_data8)
23018 return DW_UNSND (attr);
23021 /* For DW_FORM_data16 see attr_form_is_constant. */
23022 complaint (_("Attribute value is not a constant (%s)"),
23023 dwarf_form_name (attr->form));
23024 return default_value;
23028 /* Follow reference or signature attribute ATTR of SRC_DIE.
23029 On entry *REF_CU is the CU of SRC_DIE.
23030 On exit *REF_CU is the CU of the result. */
23032 static struct die_info *
23033 follow_die_ref_or_sig (struct die_info *src_die, const struct attribute *attr,
23034 struct dwarf2_cu **ref_cu)
23036 struct die_info *die;
23038 if (attr_form_is_ref (attr))
23039 die = follow_die_ref (src_die, attr, ref_cu);
23040 else if (attr->form == DW_FORM_ref_sig8)
23041 die = follow_die_sig (src_die, attr, ref_cu);
23044 dump_die_for_error (src_die);
23045 error (_("Dwarf Error: Expected reference attribute [in module %s]"),
23046 objfile_name ((*ref_cu)->per_cu->dwarf2_per_objfile->objfile));
23052 /* Follow reference OFFSET.
23053 On entry *REF_CU is the CU of the source die referencing OFFSET.
23054 On exit *REF_CU is the CU of the result.
23055 Returns NULL if OFFSET is invalid. */
23057 static struct die_info *
23058 follow_die_offset (sect_offset sect_off, int offset_in_dwz,
23059 struct dwarf2_cu **ref_cu)
23061 struct die_info temp_die;
23062 struct dwarf2_cu *target_cu, *cu = *ref_cu;
23063 struct dwarf2_per_objfile *dwarf2_per_objfile
23064 = cu->per_cu->dwarf2_per_objfile;
23066 gdb_assert (cu->per_cu != NULL);
23070 if (cu->per_cu->is_debug_types)
23072 /* .debug_types CUs cannot reference anything outside their CU.
23073 If they need to, they have to reference a signatured type via
23074 DW_FORM_ref_sig8. */
23075 if (!offset_in_cu_p (&cu->header, sect_off))
23078 else if (offset_in_dwz != cu->per_cu->is_dwz
23079 || !offset_in_cu_p (&cu->header, sect_off))
23081 struct dwarf2_per_cu_data *per_cu;
23083 per_cu = dwarf2_find_containing_comp_unit (sect_off, offset_in_dwz,
23084 dwarf2_per_objfile);
23086 /* If necessary, add it to the queue and load its DIEs. */
23087 if (maybe_queue_comp_unit (cu, per_cu, cu->language))
23088 load_full_comp_unit (per_cu, false, cu->language);
23090 target_cu = per_cu->cu;
23092 else if (cu->dies == NULL)
23094 /* We're loading full DIEs during partial symbol reading. */
23095 gdb_assert (dwarf2_per_objfile->reading_partial_symbols);
23096 load_full_comp_unit (cu->per_cu, false, language_minimal);
23099 *ref_cu = target_cu;
23100 temp_die.sect_off = sect_off;
23102 if (target_cu != cu)
23103 target_cu->ancestor = cu;
23105 return (struct die_info *) htab_find_with_hash (target_cu->die_hash,
23107 to_underlying (sect_off));
23110 /* Follow reference attribute ATTR of SRC_DIE.
23111 On entry *REF_CU is the CU of SRC_DIE.
23112 On exit *REF_CU is the CU of the result. */
23114 static struct die_info *
23115 follow_die_ref (struct die_info *src_die, const struct attribute *attr,
23116 struct dwarf2_cu **ref_cu)
23118 sect_offset sect_off = dwarf2_get_ref_die_offset (attr);
23119 struct dwarf2_cu *cu = *ref_cu;
23120 struct die_info *die;
23122 die = follow_die_offset (sect_off,
23123 (attr->form == DW_FORM_GNU_ref_alt
23124 || cu->per_cu->is_dwz),
23127 error (_("Dwarf Error: Cannot find DIE at %s referenced from DIE "
23128 "at %s [in module %s]"),
23129 sect_offset_str (sect_off), sect_offset_str (src_die->sect_off),
23130 objfile_name (cu->per_cu->dwarf2_per_objfile->objfile));
23135 /* Return DWARF block referenced by DW_AT_location of DIE at SECT_OFF at PER_CU.
23136 Returned value is intended for DW_OP_call*. Returned
23137 dwarf2_locexpr_baton->data has lifetime of
23138 PER_CU->DWARF2_PER_OBJFILE->OBJFILE. */
23140 struct dwarf2_locexpr_baton
23141 dwarf2_fetch_die_loc_sect_off (sect_offset sect_off,
23142 struct dwarf2_per_cu_data *per_cu,
23143 CORE_ADDR (*get_frame_pc) (void *baton),
23144 void *baton, bool resolve_abstract_p)
23146 struct dwarf2_cu *cu;
23147 struct die_info *die;
23148 struct attribute *attr;
23149 struct dwarf2_locexpr_baton retval;
23150 struct dwarf2_per_objfile *dwarf2_per_objfile = per_cu->dwarf2_per_objfile;
23151 struct objfile *objfile = dwarf2_per_objfile->objfile;
23153 if (per_cu->cu == NULL)
23154 load_cu (per_cu, false);
23158 /* We shouldn't get here for a dummy CU, but don't crash on the user.
23159 Instead just throw an error, not much else we can do. */
23160 error (_("Dwarf Error: Dummy CU at %s referenced in module %s"),
23161 sect_offset_str (sect_off), objfile_name (objfile));
23164 die = follow_die_offset (sect_off, per_cu->is_dwz, &cu);
23166 error (_("Dwarf Error: Cannot find DIE at %s referenced in module %s"),
23167 sect_offset_str (sect_off), objfile_name (objfile));
23169 attr = dwarf2_attr (die, DW_AT_location, cu);
23170 if (!attr && resolve_abstract_p
23171 && (dwarf2_per_objfile->abstract_to_concrete.find (die)
23172 != dwarf2_per_objfile->abstract_to_concrete.end ()))
23174 CORE_ADDR pc = (*get_frame_pc) (baton);
23176 for (const auto &cand : dwarf2_per_objfile->abstract_to_concrete[die])
23179 || cand->parent->tag != DW_TAG_subprogram)
23182 CORE_ADDR pc_low, pc_high;
23183 get_scope_pc_bounds (cand->parent, &pc_low, &pc_high, cu);
23184 if (pc_low == ((CORE_ADDR) -1)
23185 || !(pc_low <= pc && pc < pc_high))
23189 attr = dwarf2_attr (die, DW_AT_location, cu);
23196 /* DWARF: "If there is no such attribute, then there is no effect.".
23197 DATA is ignored if SIZE is 0. */
23199 retval.data = NULL;
23202 else if (attr_form_is_section_offset (attr))
23204 struct dwarf2_loclist_baton loclist_baton;
23205 CORE_ADDR pc = (*get_frame_pc) (baton);
23208 fill_in_loclist_baton (cu, &loclist_baton, attr);
23210 retval.data = dwarf2_find_location_expression (&loclist_baton,
23212 retval.size = size;
23216 if (!attr_form_is_block (attr))
23217 error (_("Dwarf Error: DIE at %s referenced in module %s "
23218 "is neither DW_FORM_block* nor DW_FORM_exprloc"),
23219 sect_offset_str (sect_off), objfile_name (objfile));
23221 retval.data = DW_BLOCK (attr)->data;
23222 retval.size = DW_BLOCK (attr)->size;
23224 retval.per_cu = cu->per_cu;
23226 age_cached_comp_units (dwarf2_per_objfile);
23231 /* Like dwarf2_fetch_die_loc_sect_off, but take a CU
23234 struct dwarf2_locexpr_baton
23235 dwarf2_fetch_die_loc_cu_off (cu_offset offset_in_cu,
23236 struct dwarf2_per_cu_data *per_cu,
23237 CORE_ADDR (*get_frame_pc) (void *baton),
23240 sect_offset sect_off = per_cu->sect_off + to_underlying (offset_in_cu);
23242 return dwarf2_fetch_die_loc_sect_off (sect_off, per_cu, get_frame_pc, baton);
23245 /* Write a constant of a given type as target-ordered bytes into
23248 static const gdb_byte *
23249 write_constant_as_bytes (struct obstack *obstack,
23250 enum bfd_endian byte_order,
23257 *len = TYPE_LENGTH (type);
23258 result = (gdb_byte *) obstack_alloc (obstack, *len);
23259 store_unsigned_integer (result, *len, byte_order, value);
23264 /* If the DIE at OFFSET in PER_CU has a DW_AT_const_value, return a
23265 pointer to the constant bytes and set LEN to the length of the
23266 data. If memory is needed, allocate it on OBSTACK. If the DIE
23267 does not have a DW_AT_const_value, return NULL. */
23270 dwarf2_fetch_constant_bytes (sect_offset sect_off,
23271 struct dwarf2_per_cu_data *per_cu,
23272 struct obstack *obstack,
23275 struct dwarf2_cu *cu;
23276 struct die_info *die;
23277 struct attribute *attr;
23278 const gdb_byte *result = NULL;
23281 enum bfd_endian byte_order;
23282 struct objfile *objfile = per_cu->dwarf2_per_objfile->objfile;
23284 if (per_cu->cu == NULL)
23285 load_cu (per_cu, false);
23289 /* We shouldn't get here for a dummy CU, but don't crash on the user.
23290 Instead just throw an error, not much else we can do. */
23291 error (_("Dwarf Error: Dummy CU at %s referenced in module %s"),
23292 sect_offset_str (sect_off), objfile_name (objfile));
23295 die = follow_die_offset (sect_off, per_cu->is_dwz, &cu);
23297 error (_("Dwarf Error: Cannot find DIE at %s referenced in module %s"),
23298 sect_offset_str (sect_off), objfile_name (objfile));
23300 attr = dwarf2_attr (die, DW_AT_const_value, cu);
23304 byte_order = (bfd_big_endian (objfile->obfd)
23305 ? BFD_ENDIAN_BIG : BFD_ENDIAN_LITTLE);
23307 switch (attr->form)
23310 case DW_FORM_addrx:
23311 case DW_FORM_GNU_addr_index:
23315 *len = cu->header.addr_size;
23316 tem = (gdb_byte *) obstack_alloc (obstack, *len);
23317 store_unsigned_integer (tem, *len, byte_order, DW_ADDR (attr));
23321 case DW_FORM_string:
23323 case DW_FORM_GNU_str_index:
23324 case DW_FORM_GNU_strp_alt:
23325 /* DW_STRING is already allocated on the objfile obstack, point
23327 result = (const gdb_byte *) DW_STRING (attr);
23328 *len = strlen (DW_STRING (attr));
23330 case DW_FORM_block1:
23331 case DW_FORM_block2:
23332 case DW_FORM_block4:
23333 case DW_FORM_block:
23334 case DW_FORM_exprloc:
23335 case DW_FORM_data16:
23336 result = DW_BLOCK (attr)->data;
23337 *len = DW_BLOCK (attr)->size;
23340 /* The DW_AT_const_value attributes are supposed to carry the
23341 symbol's value "represented as it would be on the target
23342 architecture." By the time we get here, it's already been
23343 converted to host endianness, so we just need to sign- or
23344 zero-extend it as appropriate. */
23345 case DW_FORM_data1:
23346 type = die_type (die, cu);
23347 result = dwarf2_const_value_data (attr, obstack, cu, &value, 8);
23348 if (result == NULL)
23349 result = write_constant_as_bytes (obstack, byte_order,
23352 case DW_FORM_data2:
23353 type = die_type (die, cu);
23354 result = dwarf2_const_value_data (attr, obstack, cu, &value, 16);
23355 if (result == NULL)
23356 result = write_constant_as_bytes (obstack, byte_order,
23359 case DW_FORM_data4:
23360 type = die_type (die, cu);
23361 result = dwarf2_const_value_data (attr, obstack, cu, &value, 32);
23362 if (result == NULL)
23363 result = write_constant_as_bytes (obstack, byte_order,
23366 case DW_FORM_data8:
23367 type = die_type (die, cu);
23368 result = dwarf2_const_value_data (attr, obstack, cu, &value, 64);
23369 if (result == NULL)
23370 result = write_constant_as_bytes (obstack, byte_order,
23374 case DW_FORM_sdata:
23375 case DW_FORM_implicit_const:
23376 type = die_type (die, cu);
23377 result = write_constant_as_bytes (obstack, byte_order,
23378 type, DW_SND (attr), len);
23381 case DW_FORM_udata:
23382 type = die_type (die, cu);
23383 result = write_constant_as_bytes (obstack, byte_order,
23384 type, DW_UNSND (attr), len);
23388 complaint (_("unsupported const value attribute form: '%s'"),
23389 dwarf_form_name (attr->form));
23396 /* Return the type of the die at OFFSET in PER_CU. Return NULL if no
23397 valid type for this die is found. */
23400 dwarf2_fetch_die_type_sect_off (sect_offset sect_off,
23401 struct dwarf2_per_cu_data *per_cu)
23403 struct dwarf2_cu *cu;
23404 struct die_info *die;
23406 if (per_cu->cu == NULL)
23407 load_cu (per_cu, false);
23412 die = follow_die_offset (sect_off, per_cu->is_dwz, &cu);
23416 return die_type (die, cu);
23419 /* Return the type of the DIE at DIE_OFFSET in the CU named by
23423 dwarf2_get_die_type (cu_offset die_offset,
23424 struct dwarf2_per_cu_data *per_cu)
23426 sect_offset die_offset_sect = per_cu->sect_off + to_underlying (die_offset);
23427 return get_die_type_at_offset (die_offset_sect, per_cu);
23430 /* Follow type unit SIG_TYPE referenced by SRC_DIE.
23431 On entry *REF_CU is the CU of SRC_DIE.
23432 On exit *REF_CU is the CU of the result.
23433 Returns NULL if the referenced DIE isn't found. */
23435 static struct die_info *
23436 follow_die_sig_1 (struct die_info *src_die, struct signatured_type *sig_type,
23437 struct dwarf2_cu **ref_cu)
23439 struct die_info temp_die;
23440 struct dwarf2_cu *sig_cu, *cu = *ref_cu;
23441 struct die_info *die;
23443 /* While it might be nice to assert sig_type->type == NULL here,
23444 we can get here for DW_AT_imported_declaration where we need
23445 the DIE not the type. */
23447 /* If necessary, add it to the queue and load its DIEs. */
23449 if (maybe_queue_comp_unit (*ref_cu, &sig_type->per_cu, language_minimal))
23450 read_signatured_type (sig_type);
23452 sig_cu = sig_type->per_cu.cu;
23453 gdb_assert (sig_cu != NULL);
23454 gdb_assert (to_underlying (sig_type->type_offset_in_section) != 0);
23455 temp_die.sect_off = sig_type->type_offset_in_section;
23456 die = (struct die_info *) htab_find_with_hash (sig_cu->die_hash, &temp_die,
23457 to_underlying (temp_die.sect_off));
23460 struct dwarf2_per_objfile *dwarf2_per_objfile
23461 = (*ref_cu)->per_cu->dwarf2_per_objfile;
23463 /* For .gdb_index version 7 keep track of included TUs.
23464 http://sourceware.org/bugzilla/show_bug.cgi?id=15021. */
23465 if (dwarf2_per_objfile->index_table != NULL
23466 && dwarf2_per_objfile->index_table->version <= 7)
23468 VEC_safe_push (dwarf2_per_cu_ptr,
23469 (*ref_cu)->per_cu->imported_symtabs,
23475 sig_cu->ancestor = cu;
23483 /* Follow signatured type referenced by ATTR in SRC_DIE.
23484 On entry *REF_CU is the CU of SRC_DIE.
23485 On exit *REF_CU is the CU of the result.
23486 The result is the DIE of the type.
23487 If the referenced type cannot be found an error is thrown. */
23489 static struct die_info *
23490 follow_die_sig (struct die_info *src_die, const struct attribute *attr,
23491 struct dwarf2_cu **ref_cu)
23493 ULONGEST signature = DW_SIGNATURE (attr);
23494 struct signatured_type *sig_type;
23495 struct die_info *die;
23497 gdb_assert (attr->form == DW_FORM_ref_sig8);
23499 sig_type = lookup_signatured_type (*ref_cu, signature);
23500 /* sig_type will be NULL if the signatured type is missing from
23502 if (sig_type == NULL)
23504 error (_("Dwarf Error: Cannot find signatured DIE %s referenced"
23505 " from DIE at %s [in module %s]"),
23506 hex_string (signature), sect_offset_str (src_die->sect_off),
23507 objfile_name ((*ref_cu)->per_cu->dwarf2_per_objfile->objfile));
23510 die = follow_die_sig_1 (src_die, sig_type, ref_cu);
23513 dump_die_for_error (src_die);
23514 error (_("Dwarf Error: Problem reading signatured DIE %s referenced"
23515 " from DIE at %s [in module %s]"),
23516 hex_string (signature), sect_offset_str (src_die->sect_off),
23517 objfile_name ((*ref_cu)->per_cu->dwarf2_per_objfile->objfile));
23523 /* Get the type specified by SIGNATURE referenced in DIE/CU,
23524 reading in and processing the type unit if necessary. */
23526 static struct type *
23527 get_signatured_type (struct die_info *die, ULONGEST signature,
23528 struct dwarf2_cu *cu)
23530 struct dwarf2_per_objfile *dwarf2_per_objfile
23531 = cu->per_cu->dwarf2_per_objfile;
23532 struct signatured_type *sig_type;
23533 struct dwarf2_cu *type_cu;
23534 struct die_info *type_die;
23537 sig_type = lookup_signatured_type (cu, signature);
23538 /* sig_type will be NULL if the signatured type is missing from
23540 if (sig_type == NULL)
23542 complaint (_("Dwarf Error: Cannot find signatured DIE %s referenced"
23543 " from DIE at %s [in module %s]"),
23544 hex_string (signature), sect_offset_str (die->sect_off),
23545 objfile_name (dwarf2_per_objfile->objfile));
23546 return build_error_marker_type (cu, die);
23549 /* If we already know the type we're done. */
23550 if (sig_type->type != NULL)
23551 return sig_type->type;
23554 type_die = follow_die_sig_1 (die, sig_type, &type_cu);
23555 if (type_die != NULL)
23557 /* N.B. We need to call get_die_type to ensure only one type for this DIE
23558 is created. This is important, for example, because for c++ classes
23559 we need TYPE_NAME set which is only done by new_symbol. Blech. */
23560 type = read_type_die (type_die, type_cu);
23563 complaint (_("Dwarf Error: Cannot build signatured type %s"
23564 " referenced from DIE at %s [in module %s]"),
23565 hex_string (signature), sect_offset_str (die->sect_off),
23566 objfile_name (dwarf2_per_objfile->objfile));
23567 type = build_error_marker_type (cu, die);
23572 complaint (_("Dwarf Error: Problem reading signatured DIE %s referenced"
23573 " from DIE at %s [in module %s]"),
23574 hex_string (signature), sect_offset_str (die->sect_off),
23575 objfile_name (dwarf2_per_objfile->objfile));
23576 type = build_error_marker_type (cu, die);
23578 sig_type->type = type;
23583 /* Get the type specified by the DW_AT_signature ATTR in DIE/CU,
23584 reading in and processing the type unit if necessary. */
23586 static struct type *
23587 get_DW_AT_signature_type (struct die_info *die, const struct attribute *attr,
23588 struct dwarf2_cu *cu) /* ARI: editCase function */
23590 /* Yes, DW_AT_signature can use a non-ref_sig8 reference. */
23591 if (attr_form_is_ref (attr))
23593 struct dwarf2_cu *type_cu = cu;
23594 struct die_info *type_die = follow_die_ref (die, attr, &type_cu);
23596 return read_type_die (type_die, type_cu);
23598 else if (attr->form == DW_FORM_ref_sig8)
23600 return get_signatured_type (die, DW_SIGNATURE (attr), cu);
23604 struct dwarf2_per_objfile *dwarf2_per_objfile
23605 = cu->per_cu->dwarf2_per_objfile;
23607 complaint (_("Dwarf Error: DW_AT_signature has bad form %s in DIE"
23608 " at %s [in module %s]"),
23609 dwarf_form_name (attr->form), sect_offset_str (die->sect_off),
23610 objfile_name (dwarf2_per_objfile->objfile));
23611 return build_error_marker_type (cu, die);
23615 /* Load the DIEs associated with type unit PER_CU into memory. */
23618 load_full_type_unit (struct dwarf2_per_cu_data *per_cu)
23620 struct signatured_type *sig_type;
23622 /* Caller is responsible for ensuring type_unit_groups don't get here. */
23623 gdb_assert (! IS_TYPE_UNIT_GROUP (per_cu));
23625 /* We have the per_cu, but we need the signatured_type.
23626 Fortunately this is an easy translation. */
23627 gdb_assert (per_cu->is_debug_types);
23628 sig_type = (struct signatured_type *) per_cu;
23630 gdb_assert (per_cu->cu == NULL);
23632 read_signatured_type (sig_type);
23634 gdb_assert (per_cu->cu != NULL);
23637 /* die_reader_func for read_signatured_type.
23638 This is identical to load_full_comp_unit_reader,
23639 but is kept separate for now. */
23642 read_signatured_type_reader (const struct die_reader_specs *reader,
23643 const gdb_byte *info_ptr,
23644 struct die_info *comp_unit_die,
23648 struct dwarf2_cu *cu = reader->cu;
23650 gdb_assert (cu->die_hash == NULL);
23652 htab_create_alloc_ex (cu->header.length / 12,
23656 &cu->comp_unit_obstack,
23657 hashtab_obstack_allocate,
23658 dummy_obstack_deallocate);
23661 comp_unit_die->child = read_die_and_siblings (reader, info_ptr,
23662 &info_ptr, comp_unit_die);
23663 cu->dies = comp_unit_die;
23664 /* comp_unit_die is not stored in die_hash, no need. */
23666 /* We try not to read any attributes in this function, because not
23667 all CUs needed for references have been loaded yet, and symbol
23668 table processing isn't initialized. But we have to set the CU language,
23669 or we won't be able to build types correctly.
23670 Similarly, if we do not read the producer, we can not apply
23671 producer-specific interpretation. */
23672 prepare_one_comp_unit (cu, cu->dies, language_minimal);
23675 /* Read in a signatured type and build its CU and DIEs.
23676 If the type is a stub for the real type in a DWO file,
23677 read in the real type from the DWO file as well. */
23680 read_signatured_type (struct signatured_type *sig_type)
23682 struct dwarf2_per_cu_data *per_cu = &sig_type->per_cu;
23684 gdb_assert (per_cu->is_debug_types);
23685 gdb_assert (per_cu->cu == NULL);
23687 init_cutu_and_read_dies (per_cu, NULL, 0, 1, false,
23688 read_signatured_type_reader, NULL);
23689 sig_type->per_cu.tu_read = 1;
23692 /* Decode simple location descriptions.
23693 Given a pointer to a dwarf block that defines a location, compute
23694 the location and return the value.
23696 NOTE drow/2003-11-18: This function is called in two situations
23697 now: for the address of static or global variables (partial symbols
23698 only) and for offsets into structures which are expected to be
23699 (more or less) constant. The partial symbol case should go away,
23700 and only the constant case should remain. That will let this
23701 function complain more accurately. A few special modes are allowed
23702 without complaint for global variables (for instance, global
23703 register values and thread-local values).
23705 A location description containing no operations indicates that the
23706 object is optimized out. The return value is 0 for that case.
23707 FIXME drow/2003-11-16: No callers check for this case any more; soon all
23708 callers will only want a very basic result and this can become a
23711 Note that stack[0] is unused except as a default error return. */
23714 decode_locdesc (struct dwarf_block *blk, struct dwarf2_cu *cu)
23716 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
23718 size_t size = blk->size;
23719 const gdb_byte *data = blk->data;
23720 CORE_ADDR stack[64];
23722 unsigned int bytes_read, unsnd;
23728 stack[++stacki] = 0;
23767 stack[++stacki] = op - DW_OP_lit0;
23802 stack[++stacki] = op - DW_OP_reg0;
23804 dwarf2_complex_location_expr_complaint ();
23808 unsnd = read_unsigned_leb128 (NULL, (data + i), &bytes_read);
23810 stack[++stacki] = unsnd;
23812 dwarf2_complex_location_expr_complaint ();
23816 stack[++stacki] = read_address (objfile->obfd, &data[i],
23821 case DW_OP_const1u:
23822 stack[++stacki] = read_1_byte (objfile->obfd, &data[i]);
23826 case DW_OP_const1s:
23827 stack[++stacki] = read_1_signed_byte (objfile->obfd, &data[i]);
23831 case DW_OP_const2u:
23832 stack[++stacki] = read_2_bytes (objfile->obfd, &data[i]);
23836 case DW_OP_const2s:
23837 stack[++stacki] = read_2_signed_bytes (objfile->obfd, &data[i]);
23841 case DW_OP_const4u:
23842 stack[++stacki] = read_4_bytes (objfile->obfd, &data[i]);
23846 case DW_OP_const4s:
23847 stack[++stacki] = read_4_signed_bytes (objfile->obfd, &data[i]);
23851 case DW_OP_const8u:
23852 stack[++stacki] = read_8_bytes (objfile->obfd, &data[i]);
23857 stack[++stacki] = read_unsigned_leb128 (NULL, (data + i),
23863 stack[++stacki] = read_signed_leb128 (NULL, (data + i), &bytes_read);
23868 stack[stacki + 1] = stack[stacki];
23873 stack[stacki - 1] += stack[stacki];
23877 case DW_OP_plus_uconst:
23878 stack[stacki] += read_unsigned_leb128 (NULL, (data + i),
23884 stack[stacki - 1] -= stack[stacki];
23889 /* If we're not the last op, then we definitely can't encode
23890 this using GDB's address_class enum. This is valid for partial
23891 global symbols, although the variable's address will be bogus
23894 dwarf2_complex_location_expr_complaint ();
23897 case DW_OP_GNU_push_tls_address:
23898 case DW_OP_form_tls_address:
23899 /* The top of the stack has the offset from the beginning
23900 of the thread control block at which the variable is located. */
23901 /* Nothing should follow this operator, so the top of stack would
23903 /* This is valid for partial global symbols, but the variable's
23904 address will be bogus in the psymtab. Make it always at least
23905 non-zero to not look as a variable garbage collected by linker
23906 which have DW_OP_addr 0. */
23908 dwarf2_complex_location_expr_complaint ();
23912 case DW_OP_GNU_uninit:
23916 case DW_OP_GNU_addr_index:
23917 case DW_OP_GNU_const_index:
23918 stack[++stacki] = read_addr_index_from_leb128 (cu, &data[i],
23925 const char *name = get_DW_OP_name (op);
23928 complaint (_("unsupported stack op: '%s'"),
23931 complaint (_("unsupported stack op: '%02x'"),
23935 return (stack[stacki]);
23938 /* Enforce maximum stack depth of SIZE-1 to avoid writing
23939 outside of the allocated space. Also enforce minimum>0. */
23940 if (stacki >= ARRAY_SIZE (stack) - 1)
23942 complaint (_("location description stack overflow"));
23948 complaint (_("location description stack underflow"));
23952 return (stack[stacki]);
23955 /* memory allocation interface */
23957 static struct dwarf_block *
23958 dwarf_alloc_block (struct dwarf2_cu *cu)
23960 return XOBNEW (&cu->comp_unit_obstack, struct dwarf_block);
23963 static struct die_info *
23964 dwarf_alloc_die (struct dwarf2_cu *cu, int num_attrs)
23966 struct die_info *die;
23967 size_t size = sizeof (struct die_info);
23970 size += (num_attrs - 1) * sizeof (struct attribute);
23972 die = (struct die_info *) obstack_alloc (&cu->comp_unit_obstack, size);
23973 memset (die, 0, sizeof (struct die_info));
23978 /* Macro support. */
23980 /* Return file name relative to the compilation directory of file number I in
23981 *LH's file name table. The result is allocated using xmalloc; the caller is
23982 responsible for freeing it. */
23985 file_file_name (int file, struct line_header *lh)
23987 /* Is the file number a valid index into the line header's file name
23988 table? Remember that file numbers start with one, not zero. */
23989 if (1 <= file && file <= lh->file_names.size ())
23991 const file_entry &fe = lh->file_names[file - 1];
23993 if (!IS_ABSOLUTE_PATH (fe.name))
23995 const char *dir = fe.include_dir (lh);
23997 return concat (dir, SLASH_STRING, fe.name, (char *) NULL);
23999 return xstrdup (fe.name);
24003 /* The compiler produced a bogus file number. We can at least
24004 record the macro definitions made in the file, even if we
24005 won't be able to find the file by name. */
24006 char fake_name[80];
24008 xsnprintf (fake_name, sizeof (fake_name),
24009 "<bad macro file number %d>", file);
24011 complaint (_("bad file number in macro information (%d)"),
24014 return xstrdup (fake_name);
24018 /* Return the full name of file number I in *LH's file name table.
24019 Use COMP_DIR as the name of the current directory of the
24020 compilation. The result is allocated using xmalloc; the caller is
24021 responsible for freeing it. */
24023 file_full_name (int file, struct line_header *lh, const char *comp_dir)
24025 /* Is the file number a valid index into the line header's file name
24026 table? Remember that file numbers start with one, not zero. */
24027 if (1 <= file && file <= lh->file_names.size ())
24029 char *relative = file_file_name (file, lh);
24031 if (IS_ABSOLUTE_PATH (relative) || comp_dir == NULL)
24033 return reconcat (relative, comp_dir, SLASH_STRING,
24034 relative, (char *) NULL);
24037 return file_file_name (file, lh);
24041 static struct macro_source_file *
24042 macro_start_file (struct dwarf2_cu *cu,
24043 int file, int line,
24044 struct macro_source_file *current_file,
24045 struct line_header *lh)
24047 /* File name relative to the compilation directory of this source file. */
24048 char *file_name = file_file_name (file, lh);
24050 if (! current_file)
24052 /* Note: We don't create a macro table for this compilation unit
24053 at all until we actually get a filename. */
24054 struct macro_table *macro_table = cu->get_builder ()->get_macro_table ();
24056 /* If we have no current file, then this must be the start_file
24057 directive for the compilation unit's main source file. */
24058 current_file = macro_set_main (macro_table, file_name);
24059 macro_define_special (macro_table);
24062 current_file = macro_include (current_file, line, file_name);
24066 return current_file;
24069 static const char *
24070 consume_improper_spaces (const char *p, const char *body)
24074 complaint (_("macro definition contains spaces "
24075 "in formal argument list:\n`%s'"),
24087 parse_macro_definition (struct macro_source_file *file, int line,
24092 /* The body string takes one of two forms. For object-like macro
24093 definitions, it should be:
24095 <macro name> " " <definition>
24097 For function-like macro definitions, it should be:
24099 <macro name> "() " <definition>
24101 <macro name> "(" <arg name> ( "," <arg name> ) * ") " <definition>
24103 Spaces may appear only where explicitly indicated, and in the
24106 The Dwarf 2 spec says that an object-like macro's name is always
24107 followed by a space, but versions of GCC around March 2002 omit
24108 the space when the macro's definition is the empty string.
24110 The Dwarf 2 spec says that there should be no spaces between the
24111 formal arguments in a function-like macro's formal argument list,
24112 but versions of GCC around March 2002 include spaces after the
24116 /* Find the extent of the macro name. The macro name is terminated
24117 by either a space or null character (for an object-like macro) or
24118 an opening paren (for a function-like macro). */
24119 for (p = body; *p; p++)
24120 if (*p == ' ' || *p == '(')
24123 if (*p == ' ' || *p == '\0')
24125 /* It's an object-like macro. */
24126 int name_len = p - body;
24127 char *name = savestring (body, name_len);
24128 const char *replacement;
24131 replacement = body + name_len + 1;
24134 dwarf2_macro_malformed_definition_complaint (body);
24135 replacement = body + name_len;
24138 macro_define_object (file, line, name, replacement);
24142 else if (*p == '(')
24144 /* It's a function-like macro. */
24145 char *name = savestring (body, p - body);
24148 char **argv = XNEWVEC (char *, argv_size);
24152 p = consume_improper_spaces (p, body);
24154 /* Parse the formal argument list. */
24155 while (*p && *p != ')')
24157 /* Find the extent of the current argument name. */
24158 const char *arg_start = p;
24160 while (*p && *p != ',' && *p != ')' && *p != ' ')
24163 if (! *p || p == arg_start)
24164 dwarf2_macro_malformed_definition_complaint (body);
24167 /* Make sure argv has room for the new argument. */
24168 if (argc >= argv_size)
24171 argv = XRESIZEVEC (char *, argv, argv_size);
24174 argv[argc++] = savestring (arg_start, p - arg_start);
24177 p = consume_improper_spaces (p, body);
24179 /* Consume the comma, if present. */
24184 p = consume_improper_spaces (p, body);
24193 /* Perfectly formed definition, no complaints. */
24194 macro_define_function (file, line, name,
24195 argc, (const char **) argv,
24197 else if (*p == '\0')
24199 /* Complain, but do define it. */
24200 dwarf2_macro_malformed_definition_complaint (body);
24201 macro_define_function (file, line, name,
24202 argc, (const char **) argv,
24206 /* Just complain. */
24207 dwarf2_macro_malformed_definition_complaint (body);
24210 /* Just complain. */
24211 dwarf2_macro_malformed_definition_complaint (body);
24217 for (i = 0; i < argc; i++)
24223 dwarf2_macro_malformed_definition_complaint (body);
24226 /* Skip some bytes from BYTES according to the form given in FORM.
24227 Returns the new pointer. */
24229 static const gdb_byte *
24230 skip_form_bytes (bfd *abfd, const gdb_byte *bytes, const gdb_byte *buffer_end,
24231 enum dwarf_form form,
24232 unsigned int offset_size,
24233 struct dwarf2_section_info *section)
24235 unsigned int bytes_read;
24239 case DW_FORM_data1:
24244 case DW_FORM_data2:
24248 case DW_FORM_data4:
24252 case DW_FORM_data8:
24256 case DW_FORM_data16:
24260 case DW_FORM_string:
24261 read_direct_string (abfd, bytes, &bytes_read);
24262 bytes += bytes_read;
24265 case DW_FORM_sec_offset:
24267 case DW_FORM_GNU_strp_alt:
24268 bytes += offset_size;
24271 case DW_FORM_block:
24272 bytes += read_unsigned_leb128 (abfd, bytes, &bytes_read);
24273 bytes += bytes_read;
24276 case DW_FORM_block1:
24277 bytes += 1 + read_1_byte (abfd, bytes);
24279 case DW_FORM_block2:
24280 bytes += 2 + read_2_bytes (abfd, bytes);
24282 case DW_FORM_block4:
24283 bytes += 4 + read_4_bytes (abfd, bytes);
24286 case DW_FORM_addrx:
24287 case DW_FORM_sdata:
24288 case DW_FORM_udata:
24289 case DW_FORM_GNU_addr_index:
24290 case DW_FORM_GNU_str_index:
24291 bytes = gdb_skip_leb128 (bytes, buffer_end);
24294 dwarf2_section_buffer_overflow_complaint (section);
24299 case DW_FORM_implicit_const:
24304 complaint (_("invalid form 0x%x in `%s'"),
24305 form, get_section_name (section));
24313 /* A helper for dwarf_decode_macros that handles skipping an unknown
24314 opcode. Returns an updated pointer to the macro data buffer; or,
24315 on error, issues a complaint and returns NULL. */
24317 static const gdb_byte *
24318 skip_unknown_opcode (unsigned int opcode,
24319 const gdb_byte **opcode_definitions,
24320 const gdb_byte *mac_ptr, const gdb_byte *mac_end,
24322 unsigned int offset_size,
24323 struct dwarf2_section_info *section)
24325 unsigned int bytes_read, i;
24327 const gdb_byte *defn;
24329 if (opcode_definitions[opcode] == NULL)
24331 complaint (_("unrecognized DW_MACFINO opcode 0x%x"),
24336 defn = opcode_definitions[opcode];
24337 arg = read_unsigned_leb128 (abfd, defn, &bytes_read);
24338 defn += bytes_read;
24340 for (i = 0; i < arg; ++i)
24342 mac_ptr = skip_form_bytes (abfd, mac_ptr, mac_end,
24343 (enum dwarf_form) defn[i], offset_size,
24345 if (mac_ptr == NULL)
24347 /* skip_form_bytes already issued the complaint. */
24355 /* A helper function which parses the header of a macro section.
24356 If the macro section is the extended (for now called "GNU") type,
24357 then this updates *OFFSET_SIZE. Returns a pointer to just after
24358 the header, or issues a complaint and returns NULL on error. */
24360 static const gdb_byte *
24361 dwarf_parse_macro_header (const gdb_byte **opcode_definitions,
24363 const gdb_byte *mac_ptr,
24364 unsigned int *offset_size,
24365 int section_is_gnu)
24367 memset (opcode_definitions, 0, 256 * sizeof (gdb_byte *));
24369 if (section_is_gnu)
24371 unsigned int version, flags;
24373 version = read_2_bytes (abfd, mac_ptr);
24374 if (version != 4 && version != 5)
24376 complaint (_("unrecognized version `%d' in .debug_macro section"),
24382 flags = read_1_byte (abfd, mac_ptr);
24384 *offset_size = (flags & 1) ? 8 : 4;
24386 if ((flags & 2) != 0)
24387 /* We don't need the line table offset. */
24388 mac_ptr += *offset_size;
24390 /* Vendor opcode descriptions. */
24391 if ((flags & 4) != 0)
24393 unsigned int i, count;
24395 count = read_1_byte (abfd, mac_ptr);
24397 for (i = 0; i < count; ++i)
24399 unsigned int opcode, bytes_read;
24402 opcode = read_1_byte (abfd, mac_ptr);
24404 opcode_definitions[opcode] = mac_ptr;
24405 arg = read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
24406 mac_ptr += bytes_read;
24415 /* A helper for dwarf_decode_macros that handles the GNU extensions,
24416 including DW_MACRO_import. */
24419 dwarf_decode_macro_bytes (struct dwarf2_cu *cu,
24421 const gdb_byte *mac_ptr, const gdb_byte *mac_end,
24422 struct macro_source_file *current_file,
24423 struct line_header *lh,
24424 struct dwarf2_section_info *section,
24425 int section_is_gnu, int section_is_dwz,
24426 unsigned int offset_size,
24427 htab_t include_hash)
24429 struct dwarf2_per_objfile *dwarf2_per_objfile
24430 = cu->per_cu->dwarf2_per_objfile;
24431 struct objfile *objfile = dwarf2_per_objfile->objfile;
24432 enum dwarf_macro_record_type macinfo_type;
24433 int at_commandline;
24434 const gdb_byte *opcode_definitions[256];
24436 mac_ptr = dwarf_parse_macro_header (opcode_definitions, abfd, mac_ptr,
24437 &offset_size, section_is_gnu);
24438 if (mac_ptr == NULL)
24440 /* We already issued a complaint. */
24444 /* Determines if GDB is still before first DW_MACINFO_start_file. If true
24445 GDB is still reading the definitions from command line. First
24446 DW_MACINFO_start_file will need to be ignored as it was already executed
24447 to create CURRENT_FILE for the main source holding also the command line
24448 definitions. On first met DW_MACINFO_start_file this flag is reset to
24449 normally execute all the remaining DW_MACINFO_start_file macinfos. */
24451 at_commandline = 1;
24455 /* Do we at least have room for a macinfo type byte? */
24456 if (mac_ptr >= mac_end)
24458 dwarf2_section_buffer_overflow_complaint (section);
24462 macinfo_type = (enum dwarf_macro_record_type) read_1_byte (abfd, mac_ptr);
24465 /* Note that we rely on the fact that the corresponding GNU and
24466 DWARF constants are the same. */
24468 DIAGNOSTIC_IGNORE_SWITCH_DIFFERENT_ENUM_TYPES
24469 switch (macinfo_type)
24471 /* A zero macinfo type indicates the end of the macro
24476 case DW_MACRO_define:
24477 case DW_MACRO_undef:
24478 case DW_MACRO_define_strp:
24479 case DW_MACRO_undef_strp:
24480 case DW_MACRO_define_sup:
24481 case DW_MACRO_undef_sup:
24483 unsigned int bytes_read;
24488 line = read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
24489 mac_ptr += bytes_read;
24491 if (macinfo_type == DW_MACRO_define
24492 || macinfo_type == DW_MACRO_undef)
24494 body = read_direct_string (abfd, mac_ptr, &bytes_read);
24495 mac_ptr += bytes_read;
24499 LONGEST str_offset;
24501 str_offset = read_offset_1 (abfd, mac_ptr, offset_size);
24502 mac_ptr += offset_size;
24504 if (macinfo_type == DW_MACRO_define_sup
24505 || macinfo_type == DW_MACRO_undef_sup
24508 struct dwz_file *dwz
24509 = dwarf2_get_dwz_file (dwarf2_per_objfile);
24511 body = read_indirect_string_from_dwz (objfile,
24515 body = read_indirect_string_at_offset (dwarf2_per_objfile,
24519 is_define = (macinfo_type == DW_MACRO_define
24520 || macinfo_type == DW_MACRO_define_strp
24521 || macinfo_type == DW_MACRO_define_sup);
24522 if (! current_file)
24524 /* DWARF violation as no main source is present. */
24525 complaint (_("debug info with no main source gives macro %s "
24527 is_define ? _("definition") : _("undefinition"),
24531 if ((line == 0 && !at_commandline)
24532 || (line != 0 && at_commandline))
24533 complaint (_("debug info gives %s macro %s with %s line %d: %s"),
24534 at_commandline ? _("command-line") : _("in-file"),
24535 is_define ? _("definition") : _("undefinition"),
24536 line == 0 ? _("zero") : _("non-zero"), line, body);
24539 parse_macro_definition (current_file, line, body);
24542 gdb_assert (macinfo_type == DW_MACRO_undef
24543 || macinfo_type == DW_MACRO_undef_strp
24544 || macinfo_type == DW_MACRO_undef_sup);
24545 macro_undef (current_file, line, body);
24550 case DW_MACRO_start_file:
24552 unsigned int bytes_read;
24555 line = read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
24556 mac_ptr += bytes_read;
24557 file = read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
24558 mac_ptr += bytes_read;
24560 if ((line == 0 && !at_commandline)
24561 || (line != 0 && at_commandline))
24562 complaint (_("debug info gives source %d included "
24563 "from %s at %s line %d"),
24564 file, at_commandline ? _("command-line") : _("file"),
24565 line == 0 ? _("zero") : _("non-zero"), line);
24567 if (at_commandline)
24569 /* This DW_MACRO_start_file was executed in the
24571 at_commandline = 0;
24574 current_file = macro_start_file (cu, file, line, current_file,
24579 case DW_MACRO_end_file:
24580 if (! current_file)
24581 complaint (_("macro debug info has an unmatched "
24582 "`close_file' directive"));
24585 current_file = current_file->included_by;
24586 if (! current_file)
24588 enum dwarf_macro_record_type next_type;
24590 /* GCC circa March 2002 doesn't produce the zero
24591 type byte marking the end of the compilation
24592 unit. Complain if it's not there, but exit no
24595 /* Do we at least have room for a macinfo type byte? */
24596 if (mac_ptr >= mac_end)
24598 dwarf2_section_buffer_overflow_complaint (section);
24602 /* We don't increment mac_ptr here, so this is just
24605 = (enum dwarf_macro_record_type) read_1_byte (abfd,
24607 if (next_type != 0)
24608 complaint (_("no terminating 0-type entry for "
24609 "macros in `.debug_macinfo' section"));
24616 case DW_MACRO_import:
24617 case DW_MACRO_import_sup:
24621 bfd *include_bfd = abfd;
24622 struct dwarf2_section_info *include_section = section;
24623 const gdb_byte *include_mac_end = mac_end;
24624 int is_dwz = section_is_dwz;
24625 const gdb_byte *new_mac_ptr;
24627 offset = read_offset_1 (abfd, mac_ptr, offset_size);
24628 mac_ptr += offset_size;
24630 if (macinfo_type == DW_MACRO_import_sup)
24632 struct dwz_file *dwz = dwarf2_get_dwz_file (dwarf2_per_objfile);
24634 dwarf2_read_section (objfile, &dwz->macro);
24636 include_section = &dwz->macro;
24637 include_bfd = get_section_bfd_owner (include_section);
24638 include_mac_end = dwz->macro.buffer + dwz->macro.size;
24642 new_mac_ptr = include_section->buffer + offset;
24643 slot = htab_find_slot (include_hash, new_mac_ptr, INSERT);
24647 /* This has actually happened; see
24648 http://sourceware.org/bugzilla/show_bug.cgi?id=13568. */
24649 complaint (_("recursive DW_MACRO_import in "
24650 ".debug_macro section"));
24654 *slot = (void *) new_mac_ptr;
24656 dwarf_decode_macro_bytes (cu, include_bfd, new_mac_ptr,
24657 include_mac_end, current_file, lh,
24658 section, section_is_gnu, is_dwz,
24659 offset_size, include_hash);
24661 htab_remove_elt (include_hash, (void *) new_mac_ptr);
24666 case DW_MACINFO_vendor_ext:
24667 if (!section_is_gnu)
24669 unsigned int bytes_read;
24671 /* This reads the constant, but since we don't recognize
24672 any vendor extensions, we ignore it. */
24673 read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
24674 mac_ptr += bytes_read;
24675 read_direct_string (abfd, mac_ptr, &bytes_read);
24676 mac_ptr += bytes_read;
24678 /* We don't recognize any vendor extensions. */
24684 mac_ptr = skip_unknown_opcode (macinfo_type, opcode_definitions,
24685 mac_ptr, mac_end, abfd, offset_size,
24687 if (mac_ptr == NULL)
24692 } while (macinfo_type != 0);
24696 dwarf_decode_macros (struct dwarf2_cu *cu, unsigned int offset,
24697 int section_is_gnu)
24699 struct dwarf2_per_objfile *dwarf2_per_objfile
24700 = cu->per_cu->dwarf2_per_objfile;
24701 struct objfile *objfile = dwarf2_per_objfile->objfile;
24702 struct line_header *lh = cu->line_header;
24704 const gdb_byte *mac_ptr, *mac_end;
24705 struct macro_source_file *current_file = 0;
24706 enum dwarf_macro_record_type macinfo_type;
24707 unsigned int offset_size = cu->header.offset_size;
24708 const gdb_byte *opcode_definitions[256];
24710 struct dwarf2_section_info *section;
24711 const char *section_name;
24713 if (cu->dwo_unit != NULL)
24715 if (section_is_gnu)
24717 section = &cu->dwo_unit->dwo_file->sections.macro;
24718 section_name = ".debug_macro.dwo";
24722 section = &cu->dwo_unit->dwo_file->sections.macinfo;
24723 section_name = ".debug_macinfo.dwo";
24728 if (section_is_gnu)
24730 section = &dwarf2_per_objfile->macro;
24731 section_name = ".debug_macro";
24735 section = &dwarf2_per_objfile->macinfo;
24736 section_name = ".debug_macinfo";
24740 dwarf2_read_section (objfile, section);
24741 if (section->buffer == NULL)
24743 complaint (_("missing %s section"), section_name);
24746 abfd = get_section_bfd_owner (section);
24748 /* First pass: Find the name of the base filename.
24749 This filename is needed in order to process all macros whose definition
24750 (or undefinition) comes from the command line. These macros are defined
24751 before the first DW_MACINFO_start_file entry, and yet still need to be
24752 associated to the base file.
24754 To determine the base file name, we scan the macro definitions until we
24755 reach the first DW_MACINFO_start_file entry. We then initialize
24756 CURRENT_FILE accordingly so that any macro definition found before the
24757 first DW_MACINFO_start_file can still be associated to the base file. */
24759 mac_ptr = section->buffer + offset;
24760 mac_end = section->buffer + section->size;
24762 mac_ptr = dwarf_parse_macro_header (opcode_definitions, abfd, mac_ptr,
24763 &offset_size, section_is_gnu);
24764 if (mac_ptr == NULL)
24766 /* We already issued a complaint. */
24772 /* Do we at least have room for a macinfo type byte? */
24773 if (mac_ptr >= mac_end)
24775 /* Complaint is printed during the second pass as GDB will probably
24776 stop the first pass earlier upon finding
24777 DW_MACINFO_start_file. */
24781 macinfo_type = (enum dwarf_macro_record_type) read_1_byte (abfd, mac_ptr);
24784 /* Note that we rely on the fact that the corresponding GNU and
24785 DWARF constants are the same. */
24787 DIAGNOSTIC_IGNORE_SWITCH_DIFFERENT_ENUM_TYPES
24788 switch (macinfo_type)
24790 /* A zero macinfo type indicates the end of the macro
24795 case DW_MACRO_define:
24796 case DW_MACRO_undef:
24797 /* Only skip the data by MAC_PTR. */
24799 unsigned int bytes_read;
24801 read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
24802 mac_ptr += bytes_read;
24803 read_direct_string (abfd, mac_ptr, &bytes_read);
24804 mac_ptr += bytes_read;
24808 case DW_MACRO_start_file:
24810 unsigned int bytes_read;
24813 line = read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
24814 mac_ptr += bytes_read;
24815 file = read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
24816 mac_ptr += bytes_read;
24818 current_file = macro_start_file (cu, file, line, current_file, lh);
24822 case DW_MACRO_end_file:
24823 /* No data to skip by MAC_PTR. */
24826 case DW_MACRO_define_strp:
24827 case DW_MACRO_undef_strp:
24828 case DW_MACRO_define_sup:
24829 case DW_MACRO_undef_sup:
24831 unsigned int bytes_read;
24833 read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
24834 mac_ptr += bytes_read;
24835 mac_ptr += offset_size;
24839 case DW_MACRO_import:
24840 case DW_MACRO_import_sup:
24841 /* Note that, according to the spec, a transparent include
24842 chain cannot call DW_MACRO_start_file. So, we can just
24843 skip this opcode. */
24844 mac_ptr += offset_size;
24847 case DW_MACINFO_vendor_ext:
24848 /* Only skip the data by MAC_PTR. */
24849 if (!section_is_gnu)
24851 unsigned int bytes_read;
24853 read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
24854 mac_ptr += bytes_read;
24855 read_direct_string (abfd, mac_ptr, &bytes_read);
24856 mac_ptr += bytes_read;
24861 mac_ptr = skip_unknown_opcode (macinfo_type, opcode_definitions,
24862 mac_ptr, mac_end, abfd, offset_size,
24864 if (mac_ptr == NULL)
24869 } while (macinfo_type != 0 && current_file == NULL);
24871 /* Second pass: Process all entries.
24873 Use the AT_COMMAND_LINE flag to determine whether we are still processing
24874 command-line macro definitions/undefinitions. This flag is unset when we
24875 reach the first DW_MACINFO_start_file entry. */
24877 htab_up include_hash (htab_create_alloc (1, htab_hash_pointer,
24879 NULL, xcalloc, xfree));
24880 mac_ptr = section->buffer + offset;
24881 slot = htab_find_slot (include_hash.get (), mac_ptr, INSERT);
24882 *slot = (void *) mac_ptr;
24883 dwarf_decode_macro_bytes (cu, abfd, mac_ptr, mac_end,
24884 current_file, lh, section,
24885 section_is_gnu, 0, offset_size,
24886 include_hash.get ());
24889 /* Check if the attribute's form is a DW_FORM_block*
24890 if so return true else false. */
24893 attr_form_is_block (const struct attribute *attr)
24895 return (attr == NULL ? 0 :
24896 attr->form == DW_FORM_block1
24897 || attr->form == DW_FORM_block2
24898 || attr->form == DW_FORM_block4
24899 || attr->form == DW_FORM_block
24900 || attr->form == DW_FORM_exprloc);
24903 /* Return non-zero if ATTR's value is a section offset --- classes
24904 lineptr, loclistptr, macptr or rangelistptr --- or zero, otherwise.
24905 You may use DW_UNSND (attr) to retrieve such offsets.
24907 Section 7.5.4, "Attribute Encodings", explains that no attribute
24908 may have a value that belongs to more than one of these classes; it
24909 would be ambiguous if we did, because we use the same forms for all
24913 attr_form_is_section_offset (const struct attribute *attr)
24915 return (attr->form == DW_FORM_data4
24916 || attr->form == DW_FORM_data8
24917 || attr->form == DW_FORM_sec_offset);
24920 /* Return non-zero if ATTR's value falls in the 'constant' class, or
24921 zero otherwise. When this function returns true, you can apply
24922 dwarf2_get_attr_constant_value to it.
24924 However, note that for some attributes you must check
24925 attr_form_is_section_offset before using this test. DW_FORM_data4
24926 and DW_FORM_data8 are members of both the constant class, and of
24927 the classes that contain offsets into other debug sections
24928 (lineptr, loclistptr, macptr or rangelistptr). The DWARF spec says
24929 that, if an attribute's can be either a constant or one of the
24930 section offset classes, DW_FORM_data4 and DW_FORM_data8 should be
24931 taken as section offsets, not constants.
24933 DW_FORM_data16 is not considered as dwarf2_get_attr_constant_value
24934 cannot handle that. */
24937 attr_form_is_constant (const struct attribute *attr)
24939 switch (attr->form)
24941 case DW_FORM_sdata:
24942 case DW_FORM_udata:
24943 case DW_FORM_data1:
24944 case DW_FORM_data2:
24945 case DW_FORM_data4:
24946 case DW_FORM_data8:
24947 case DW_FORM_implicit_const:
24955 /* DW_ADDR is always stored already as sect_offset; despite for the forms
24956 besides DW_FORM_ref_addr it is stored as cu_offset in the DWARF file. */
24959 attr_form_is_ref (const struct attribute *attr)
24961 switch (attr->form)
24963 case DW_FORM_ref_addr:
24968 case DW_FORM_ref_udata:
24969 case DW_FORM_GNU_ref_alt:
24976 /* Return the .debug_loc section to use for CU.
24977 For DWO files use .debug_loc.dwo. */
24979 static struct dwarf2_section_info *
24980 cu_debug_loc_section (struct dwarf2_cu *cu)
24982 struct dwarf2_per_objfile *dwarf2_per_objfile
24983 = cu->per_cu->dwarf2_per_objfile;
24987 struct dwo_sections *sections = &cu->dwo_unit->dwo_file->sections;
24989 return cu->header.version >= 5 ? §ions->loclists : §ions->loc;
24991 return (cu->header.version >= 5 ? &dwarf2_per_objfile->loclists
24992 : &dwarf2_per_objfile->loc);
24995 /* A helper function that fills in a dwarf2_loclist_baton. */
24998 fill_in_loclist_baton (struct dwarf2_cu *cu,
24999 struct dwarf2_loclist_baton *baton,
25000 const struct attribute *attr)
25002 struct dwarf2_per_objfile *dwarf2_per_objfile
25003 = cu->per_cu->dwarf2_per_objfile;
25004 struct dwarf2_section_info *section = cu_debug_loc_section (cu);
25006 dwarf2_read_section (dwarf2_per_objfile->objfile, section);
25008 baton->per_cu = cu->per_cu;
25009 gdb_assert (baton->per_cu);
25010 /* We don't know how long the location list is, but make sure we
25011 don't run off the edge of the section. */
25012 baton->size = section->size - DW_UNSND (attr);
25013 baton->data = section->buffer + DW_UNSND (attr);
25014 baton->base_address = cu->base_address;
25015 baton->from_dwo = cu->dwo_unit != NULL;
25019 dwarf2_symbol_mark_computed (const struct attribute *attr, struct symbol *sym,
25020 struct dwarf2_cu *cu, int is_block)
25022 struct dwarf2_per_objfile *dwarf2_per_objfile
25023 = cu->per_cu->dwarf2_per_objfile;
25024 struct objfile *objfile = dwarf2_per_objfile->objfile;
25025 struct dwarf2_section_info *section = cu_debug_loc_section (cu);
25027 if (attr_form_is_section_offset (attr)
25028 /* .debug_loc{,.dwo} may not exist at all, or the offset may be outside
25029 the section. If so, fall through to the complaint in the
25031 && DW_UNSND (attr) < dwarf2_section_size (objfile, section))
25033 struct dwarf2_loclist_baton *baton;
25035 baton = XOBNEW (&objfile->objfile_obstack, struct dwarf2_loclist_baton);
25037 fill_in_loclist_baton (cu, baton, attr);
25039 if (cu->base_known == 0)
25040 complaint (_("Location list used without "
25041 "specifying the CU base address."));
25043 SYMBOL_ACLASS_INDEX (sym) = (is_block
25044 ? dwarf2_loclist_block_index
25045 : dwarf2_loclist_index);
25046 SYMBOL_LOCATION_BATON (sym) = baton;
25050 struct dwarf2_locexpr_baton *baton;
25052 baton = XOBNEW (&objfile->objfile_obstack, struct dwarf2_locexpr_baton);
25053 baton->per_cu = cu->per_cu;
25054 gdb_assert (baton->per_cu);
25056 if (attr_form_is_block (attr))
25058 /* Note that we're just copying the block's data pointer
25059 here, not the actual data. We're still pointing into the
25060 info_buffer for SYM's objfile; right now we never release
25061 that buffer, but when we do clean up properly this may
25063 baton->size = DW_BLOCK (attr)->size;
25064 baton->data = DW_BLOCK (attr)->data;
25068 dwarf2_invalid_attrib_class_complaint ("location description",
25069 SYMBOL_NATURAL_NAME (sym));
25073 SYMBOL_ACLASS_INDEX (sym) = (is_block
25074 ? dwarf2_locexpr_block_index
25075 : dwarf2_locexpr_index);
25076 SYMBOL_LOCATION_BATON (sym) = baton;
25080 /* Return the OBJFILE associated with the compilation unit CU. If CU
25081 came from a separate debuginfo file, then the master objfile is
25085 dwarf2_per_cu_objfile (struct dwarf2_per_cu_data *per_cu)
25087 struct objfile *objfile = per_cu->dwarf2_per_objfile->objfile;
25089 /* Return the master objfile, so that we can report and look up the
25090 correct file containing this variable. */
25091 if (objfile->separate_debug_objfile_backlink)
25092 objfile = objfile->separate_debug_objfile_backlink;
25097 /* Return comp_unit_head for PER_CU, either already available in PER_CU->CU
25098 (CU_HEADERP is unused in such case) or prepare a temporary copy at
25099 CU_HEADERP first. */
25101 static const struct comp_unit_head *
25102 per_cu_header_read_in (struct comp_unit_head *cu_headerp,
25103 struct dwarf2_per_cu_data *per_cu)
25105 const gdb_byte *info_ptr;
25108 return &per_cu->cu->header;
25110 info_ptr = per_cu->section->buffer + to_underlying (per_cu->sect_off);
25112 memset (cu_headerp, 0, sizeof (*cu_headerp));
25113 read_comp_unit_head (cu_headerp, info_ptr, per_cu->section,
25114 rcuh_kind::COMPILE);
25119 /* Return the address size given in the compilation unit header for CU. */
25122 dwarf2_per_cu_addr_size (struct dwarf2_per_cu_data *per_cu)
25124 struct comp_unit_head cu_header_local;
25125 const struct comp_unit_head *cu_headerp;
25127 cu_headerp = per_cu_header_read_in (&cu_header_local, per_cu);
25129 return cu_headerp->addr_size;
25132 /* Return the offset size given in the compilation unit header for CU. */
25135 dwarf2_per_cu_offset_size (struct dwarf2_per_cu_data *per_cu)
25137 struct comp_unit_head cu_header_local;
25138 const struct comp_unit_head *cu_headerp;
25140 cu_headerp = per_cu_header_read_in (&cu_header_local, per_cu);
25142 return cu_headerp->offset_size;
25145 /* See its dwarf2loc.h declaration. */
25148 dwarf2_per_cu_ref_addr_size (struct dwarf2_per_cu_data *per_cu)
25150 struct comp_unit_head cu_header_local;
25151 const struct comp_unit_head *cu_headerp;
25153 cu_headerp = per_cu_header_read_in (&cu_header_local, per_cu);
25155 if (cu_headerp->version == 2)
25156 return cu_headerp->addr_size;
25158 return cu_headerp->offset_size;
25161 /* Return the text offset of the CU. The returned offset comes from
25162 this CU's objfile. If this objfile came from a separate debuginfo
25163 file, then the offset may be different from the corresponding
25164 offset in the parent objfile. */
25167 dwarf2_per_cu_text_offset (struct dwarf2_per_cu_data *per_cu)
25169 struct objfile *objfile = per_cu->dwarf2_per_objfile->objfile;
25171 return ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
25174 /* Return DWARF version number of PER_CU. */
25177 dwarf2_version (struct dwarf2_per_cu_data *per_cu)
25179 return per_cu->dwarf_version;
25182 /* Locate the .debug_info compilation unit from CU's objfile which contains
25183 the DIE at OFFSET. Raises an error on failure. */
25185 static struct dwarf2_per_cu_data *
25186 dwarf2_find_containing_comp_unit (sect_offset sect_off,
25187 unsigned int offset_in_dwz,
25188 struct dwarf2_per_objfile *dwarf2_per_objfile)
25190 struct dwarf2_per_cu_data *this_cu;
25194 high = dwarf2_per_objfile->all_comp_units.size () - 1;
25197 struct dwarf2_per_cu_data *mid_cu;
25198 int mid = low + (high - low) / 2;
25200 mid_cu = dwarf2_per_objfile->all_comp_units[mid];
25201 if (mid_cu->is_dwz > offset_in_dwz
25202 || (mid_cu->is_dwz == offset_in_dwz
25203 && mid_cu->sect_off + mid_cu->length >= sect_off))
25208 gdb_assert (low == high);
25209 this_cu = dwarf2_per_objfile->all_comp_units[low];
25210 if (this_cu->is_dwz != offset_in_dwz || this_cu->sect_off > sect_off)
25212 if (low == 0 || this_cu->is_dwz != offset_in_dwz)
25213 error (_("Dwarf Error: could not find partial DIE containing "
25214 "offset %s [in module %s]"),
25215 sect_offset_str (sect_off),
25216 bfd_get_filename (dwarf2_per_objfile->objfile->obfd));
25218 gdb_assert (dwarf2_per_objfile->all_comp_units[low-1]->sect_off
25220 return dwarf2_per_objfile->all_comp_units[low-1];
25224 if (low == dwarf2_per_objfile->all_comp_units.size () - 1
25225 && sect_off >= this_cu->sect_off + this_cu->length)
25226 error (_("invalid dwarf2 offset %s"), sect_offset_str (sect_off));
25227 gdb_assert (sect_off < this_cu->sect_off + this_cu->length);
25232 /* Initialize dwarf2_cu CU, owned by PER_CU. */
25234 dwarf2_cu::dwarf2_cu (struct dwarf2_per_cu_data *per_cu_)
25235 : per_cu (per_cu_),
25237 has_loclist (false),
25238 checked_producer (false),
25239 producer_is_gxx_lt_4_6 (false),
25240 producer_is_gcc_lt_4_3 (false),
25241 producer_is_icc (false),
25242 producer_is_icc_lt_14 (false),
25243 producer_is_codewarrior (false),
25244 processing_has_namespace_info (false)
25249 /* Destroy a dwarf2_cu. */
25251 dwarf2_cu::~dwarf2_cu ()
25256 /* Initialize basic fields of dwarf_cu CU according to DIE COMP_UNIT_DIE. */
25259 prepare_one_comp_unit (struct dwarf2_cu *cu, struct die_info *comp_unit_die,
25260 enum language pretend_language)
25262 struct attribute *attr;
25264 /* Set the language we're debugging. */
25265 attr = dwarf2_attr (comp_unit_die, DW_AT_language, cu);
25267 set_cu_language (DW_UNSND (attr), cu);
25270 cu->language = pretend_language;
25271 cu->language_defn = language_def (cu->language);
25274 cu->producer = dwarf2_string_attr (comp_unit_die, DW_AT_producer, cu);
25277 /* Increase the age counter on each cached compilation unit, and free
25278 any that are too old. */
25281 age_cached_comp_units (struct dwarf2_per_objfile *dwarf2_per_objfile)
25283 struct dwarf2_per_cu_data *per_cu, **last_chain;
25285 dwarf2_clear_marks (dwarf2_per_objfile->read_in_chain);
25286 per_cu = dwarf2_per_objfile->read_in_chain;
25287 while (per_cu != NULL)
25289 per_cu->cu->last_used ++;
25290 if (per_cu->cu->last_used <= dwarf_max_cache_age)
25291 dwarf2_mark (per_cu->cu);
25292 per_cu = per_cu->cu->read_in_chain;
25295 per_cu = dwarf2_per_objfile->read_in_chain;
25296 last_chain = &dwarf2_per_objfile->read_in_chain;
25297 while (per_cu != NULL)
25299 struct dwarf2_per_cu_data *next_cu;
25301 next_cu = per_cu->cu->read_in_chain;
25303 if (!per_cu->cu->mark)
25306 *last_chain = next_cu;
25309 last_chain = &per_cu->cu->read_in_chain;
25315 /* Remove a single compilation unit from the cache. */
25318 free_one_cached_comp_unit (struct dwarf2_per_cu_data *target_per_cu)
25320 struct dwarf2_per_cu_data *per_cu, **last_chain;
25321 struct dwarf2_per_objfile *dwarf2_per_objfile
25322 = target_per_cu->dwarf2_per_objfile;
25324 per_cu = dwarf2_per_objfile->read_in_chain;
25325 last_chain = &dwarf2_per_objfile->read_in_chain;
25326 while (per_cu != NULL)
25328 struct dwarf2_per_cu_data *next_cu;
25330 next_cu = per_cu->cu->read_in_chain;
25332 if (per_cu == target_per_cu)
25336 *last_chain = next_cu;
25340 last_chain = &per_cu->cu->read_in_chain;
25346 /* Cleanup function for the dwarf2_per_objfile data. */
25349 dwarf2_free_objfile (struct objfile *objfile, void *datum)
25351 struct dwarf2_per_objfile *dwarf2_per_objfile
25352 = static_cast<struct dwarf2_per_objfile *> (datum);
25354 delete dwarf2_per_objfile;
25357 /* A set of CU "per_cu" pointer, DIE offset, and GDB type pointer.
25358 We store these in a hash table separate from the DIEs, and preserve them
25359 when the DIEs are flushed out of cache.
25361 The CU "per_cu" pointer is needed because offset alone is not enough to
25362 uniquely identify the type. A file may have multiple .debug_types sections,
25363 or the type may come from a DWO file. Furthermore, while it's more logical
25364 to use per_cu->section+offset, with Fission the section with the data is in
25365 the DWO file but we don't know that section at the point we need it.
25366 We have to use something in dwarf2_per_cu_data (or the pointer to it)
25367 because we can enter the lookup routine, get_die_type_at_offset, from
25368 outside this file, and thus won't necessarily have PER_CU->cu.
25369 Fortunately, PER_CU is stable for the life of the objfile. */
25371 struct dwarf2_per_cu_offset_and_type
25373 const struct dwarf2_per_cu_data *per_cu;
25374 sect_offset sect_off;
25378 /* Hash function for a dwarf2_per_cu_offset_and_type. */
25381 per_cu_offset_and_type_hash (const void *item)
25383 const struct dwarf2_per_cu_offset_and_type *ofs
25384 = (const struct dwarf2_per_cu_offset_and_type *) item;
25386 return (uintptr_t) ofs->per_cu + to_underlying (ofs->sect_off);
25389 /* Equality function for a dwarf2_per_cu_offset_and_type. */
25392 per_cu_offset_and_type_eq (const void *item_lhs, const void *item_rhs)
25394 const struct dwarf2_per_cu_offset_and_type *ofs_lhs
25395 = (const struct dwarf2_per_cu_offset_and_type *) item_lhs;
25396 const struct dwarf2_per_cu_offset_and_type *ofs_rhs
25397 = (const struct dwarf2_per_cu_offset_and_type *) item_rhs;
25399 return (ofs_lhs->per_cu == ofs_rhs->per_cu
25400 && ofs_lhs->sect_off == ofs_rhs->sect_off);
25403 /* Set the type associated with DIE to TYPE. Save it in CU's hash
25404 table if necessary. For convenience, return TYPE.
25406 The DIEs reading must have careful ordering to:
25407 * Not cause infite loops trying to read in DIEs as a prerequisite for
25408 reading current DIE.
25409 * Not trying to dereference contents of still incompletely read in types
25410 while reading in other DIEs.
25411 * Enable referencing still incompletely read in types just by a pointer to
25412 the type without accessing its fields.
25414 Therefore caller should follow these rules:
25415 * Try to fetch any prerequisite types we may need to build this DIE type
25416 before building the type and calling set_die_type.
25417 * After building type call set_die_type for current DIE as soon as
25418 possible before fetching more types to complete the current type.
25419 * Make the type as complete as possible before fetching more types. */
25421 static struct type *
25422 set_die_type (struct die_info *die, struct type *type, struct dwarf2_cu *cu)
25424 struct dwarf2_per_objfile *dwarf2_per_objfile
25425 = cu->per_cu->dwarf2_per_objfile;
25426 struct dwarf2_per_cu_offset_and_type **slot, ofs;
25427 struct objfile *objfile = dwarf2_per_objfile->objfile;
25428 struct attribute *attr;
25429 struct dynamic_prop prop;
25431 /* For Ada types, make sure that the gnat-specific data is always
25432 initialized (if not already set). There are a few types where
25433 we should not be doing so, because the type-specific area is
25434 already used to hold some other piece of info (eg: TYPE_CODE_FLT
25435 where the type-specific area is used to store the floatformat).
25436 But this is not a problem, because the gnat-specific information
25437 is actually not needed for these types. */
25438 if (need_gnat_info (cu)
25439 && TYPE_CODE (type) != TYPE_CODE_FUNC
25440 && TYPE_CODE (type) != TYPE_CODE_FLT
25441 && TYPE_CODE (type) != TYPE_CODE_METHODPTR
25442 && TYPE_CODE (type) != TYPE_CODE_MEMBERPTR
25443 && TYPE_CODE (type) != TYPE_CODE_METHOD
25444 && !HAVE_GNAT_AUX_INFO (type))
25445 INIT_GNAT_SPECIFIC (type);
25447 /* Read DW_AT_allocated and set in type. */
25448 attr = dwarf2_attr (die, DW_AT_allocated, cu);
25449 if (attr_form_is_block (attr))
25451 if (attr_to_dynamic_prop (attr, die, cu, &prop))
25452 add_dyn_prop (DYN_PROP_ALLOCATED, prop, type);
25454 else if (attr != NULL)
25456 complaint (_("DW_AT_allocated has the wrong form (%s) at DIE %s"),
25457 (attr != NULL ? dwarf_form_name (attr->form) : "n/a"),
25458 sect_offset_str (die->sect_off));
25461 /* Read DW_AT_associated and set in type. */
25462 attr = dwarf2_attr (die, DW_AT_associated, cu);
25463 if (attr_form_is_block (attr))
25465 if (attr_to_dynamic_prop (attr, die, cu, &prop))
25466 add_dyn_prop (DYN_PROP_ASSOCIATED, prop, type);
25468 else if (attr != NULL)
25470 complaint (_("DW_AT_associated has the wrong form (%s) at DIE %s"),
25471 (attr != NULL ? dwarf_form_name (attr->form) : "n/a"),
25472 sect_offset_str (die->sect_off));
25475 /* Read DW_AT_data_location and set in type. */
25476 attr = dwarf2_attr (die, DW_AT_data_location, cu);
25477 if (attr_to_dynamic_prop (attr, die, cu, &prop))
25478 add_dyn_prop (DYN_PROP_DATA_LOCATION, prop, type);
25480 if (dwarf2_per_objfile->die_type_hash == NULL)
25482 dwarf2_per_objfile->die_type_hash =
25483 htab_create_alloc_ex (127,
25484 per_cu_offset_and_type_hash,
25485 per_cu_offset_and_type_eq,
25487 &objfile->objfile_obstack,
25488 hashtab_obstack_allocate,
25489 dummy_obstack_deallocate);
25492 ofs.per_cu = cu->per_cu;
25493 ofs.sect_off = die->sect_off;
25495 slot = (struct dwarf2_per_cu_offset_and_type **)
25496 htab_find_slot (dwarf2_per_objfile->die_type_hash, &ofs, INSERT);
25498 complaint (_("A problem internal to GDB: DIE %s has type already set"),
25499 sect_offset_str (die->sect_off));
25500 *slot = XOBNEW (&objfile->objfile_obstack,
25501 struct dwarf2_per_cu_offset_and_type);
25506 /* Look up the type for the die at SECT_OFF in PER_CU in die_type_hash,
25507 or return NULL if the die does not have a saved type. */
25509 static struct type *
25510 get_die_type_at_offset (sect_offset sect_off,
25511 struct dwarf2_per_cu_data *per_cu)
25513 struct dwarf2_per_cu_offset_and_type *slot, ofs;
25514 struct dwarf2_per_objfile *dwarf2_per_objfile = per_cu->dwarf2_per_objfile;
25516 if (dwarf2_per_objfile->die_type_hash == NULL)
25519 ofs.per_cu = per_cu;
25520 ofs.sect_off = sect_off;
25521 slot = ((struct dwarf2_per_cu_offset_and_type *)
25522 htab_find (dwarf2_per_objfile->die_type_hash, &ofs));
25529 /* Look up the type for DIE in CU in die_type_hash,
25530 or return NULL if DIE does not have a saved type. */
25532 static struct type *
25533 get_die_type (struct die_info *die, struct dwarf2_cu *cu)
25535 return get_die_type_at_offset (die->sect_off, cu->per_cu);
25538 /* Add a dependence relationship from CU to REF_PER_CU. */
25541 dwarf2_add_dependence (struct dwarf2_cu *cu,
25542 struct dwarf2_per_cu_data *ref_per_cu)
25546 if (cu->dependencies == NULL)
25548 = htab_create_alloc_ex (5, htab_hash_pointer, htab_eq_pointer,
25549 NULL, &cu->comp_unit_obstack,
25550 hashtab_obstack_allocate,
25551 dummy_obstack_deallocate);
25553 slot = htab_find_slot (cu->dependencies, ref_per_cu, INSERT);
25555 *slot = ref_per_cu;
25558 /* Subroutine of dwarf2_mark to pass to htab_traverse.
25559 Set the mark field in every compilation unit in the
25560 cache that we must keep because we are keeping CU. */
25563 dwarf2_mark_helper (void **slot, void *data)
25565 struct dwarf2_per_cu_data *per_cu;
25567 per_cu = (struct dwarf2_per_cu_data *) *slot;
25569 /* cu->dependencies references may not yet have been ever read if QUIT aborts
25570 reading of the chain. As such dependencies remain valid it is not much
25571 useful to track and undo them during QUIT cleanups. */
25572 if (per_cu->cu == NULL)
25575 if (per_cu->cu->mark)
25577 per_cu->cu->mark = true;
25579 if (per_cu->cu->dependencies != NULL)
25580 htab_traverse (per_cu->cu->dependencies, dwarf2_mark_helper, NULL);
25585 /* Set the mark field in CU and in every other compilation unit in the
25586 cache that we must keep because we are keeping CU. */
25589 dwarf2_mark (struct dwarf2_cu *cu)
25594 if (cu->dependencies != NULL)
25595 htab_traverse (cu->dependencies, dwarf2_mark_helper, NULL);
25599 dwarf2_clear_marks (struct dwarf2_per_cu_data *per_cu)
25603 per_cu->cu->mark = false;
25604 per_cu = per_cu->cu->read_in_chain;
25608 /* Trivial hash function for partial_die_info: the hash value of a DIE
25609 is its offset in .debug_info for this objfile. */
25612 partial_die_hash (const void *item)
25614 const struct partial_die_info *part_die
25615 = (const struct partial_die_info *) item;
25617 return to_underlying (part_die->sect_off);
25620 /* Trivial comparison function for partial_die_info structures: two DIEs
25621 are equal if they have the same offset. */
25624 partial_die_eq (const void *item_lhs, const void *item_rhs)
25626 const struct partial_die_info *part_die_lhs
25627 = (const struct partial_die_info *) item_lhs;
25628 const struct partial_die_info *part_die_rhs
25629 = (const struct partial_die_info *) item_rhs;
25631 return part_die_lhs->sect_off == part_die_rhs->sect_off;
25634 struct cmd_list_element *set_dwarf_cmdlist;
25635 struct cmd_list_element *show_dwarf_cmdlist;
25638 set_dwarf_cmd (const char *args, int from_tty)
25640 help_list (set_dwarf_cmdlist, "maintenance set dwarf ", all_commands,
25645 show_dwarf_cmd (const char *args, int from_tty)
25647 cmd_show_list (show_dwarf_cmdlist, from_tty, "");
25650 int dwarf_always_disassemble;
25653 show_dwarf_always_disassemble (struct ui_file *file, int from_tty,
25654 struct cmd_list_element *c, const char *value)
25656 fprintf_filtered (file,
25657 _("Whether to always disassemble "
25658 "DWARF expressions is %s.\n"),
25663 show_check_physname (struct ui_file *file, int from_tty,
25664 struct cmd_list_element *c, const char *value)
25666 fprintf_filtered (file,
25667 _("Whether to check \"physname\" is %s.\n"),
25672 _initialize_dwarf2_read (void)
25674 dwarf2_objfile_data_key
25675 = register_objfile_data_with_cleanup (nullptr, dwarf2_free_objfile);
25677 add_prefix_cmd ("dwarf", class_maintenance, set_dwarf_cmd, _("\
25678 Set DWARF specific variables.\n\
25679 Configure DWARF variables such as the cache size"),
25680 &set_dwarf_cmdlist, "maintenance set dwarf ",
25681 0/*allow-unknown*/, &maintenance_set_cmdlist);
25683 add_prefix_cmd ("dwarf", class_maintenance, show_dwarf_cmd, _("\
25684 Show DWARF specific variables\n\
25685 Show DWARF variables such as the cache size"),
25686 &show_dwarf_cmdlist, "maintenance show dwarf ",
25687 0/*allow-unknown*/, &maintenance_show_cmdlist);
25689 add_setshow_zinteger_cmd ("max-cache-age", class_obscure,
25690 &dwarf_max_cache_age, _("\
25691 Set the upper bound on the age of cached DWARF compilation units."), _("\
25692 Show the upper bound on the age of cached DWARF compilation units."), _("\
25693 A higher limit means that cached compilation units will be stored\n\
25694 in memory longer, and more total memory will be used. Zero disables\n\
25695 caching, which can slow down startup."),
25697 show_dwarf_max_cache_age,
25698 &set_dwarf_cmdlist,
25699 &show_dwarf_cmdlist);
25701 add_setshow_boolean_cmd ("always-disassemble", class_obscure,
25702 &dwarf_always_disassemble, _("\
25703 Set whether `info address' always disassembles DWARF expressions."), _("\
25704 Show whether `info address' always disassembles DWARF expressions."), _("\
25705 When enabled, DWARF expressions are always printed in an assembly-like\n\
25706 syntax. When disabled, expressions will be printed in a more\n\
25707 conversational style, when possible."),
25709 show_dwarf_always_disassemble,
25710 &set_dwarf_cmdlist,
25711 &show_dwarf_cmdlist);
25713 add_setshow_zuinteger_cmd ("dwarf-read", no_class, &dwarf_read_debug, _("\
25714 Set debugging of the DWARF reader."), _("\
25715 Show debugging of the DWARF reader."), _("\
25716 When enabled (non-zero), debugging messages are printed during DWARF\n\
25717 reading and symtab expansion. A value of 1 (one) provides basic\n\
25718 information. A value greater than 1 provides more verbose information."),
25721 &setdebuglist, &showdebuglist);
25723 add_setshow_zuinteger_cmd ("dwarf-die", no_class, &dwarf_die_debug, _("\
25724 Set debugging of the DWARF DIE reader."), _("\
25725 Show debugging of the DWARF DIE reader."), _("\
25726 When enabled (non-zero), DIEs are dumped after they are read in.\n\
25727 The value is the maximum depth to print."),
25730 &setdebuglist, &showdebuglist);
25732 add_setshow_zuinteger_cmd ("dwarf-line", no_class, &dwarf_line_debug, _("\
25733 Set debugging of the dwarf line reader."), _("\
25734 Show debugging of the dwarf line reader."), _("\
25735 When enabled (non-zero), line number entries are dumped as they are read in.\n\
25736 A value of 1 (one) provides basic information.\n\
25737 A value greater than 1 provides more verbose information."),
25740 &setdebuglist, &showdebuglist);
25742 add_setshow_boolean_cmd ("check-physname", no_class, &check_physname, _("\
25743 Set cross-checking of \"physname\" code against demangler."), _("\
25744 Show cross-checking of \"physname\" code against demangler."), _("\
25745 When enabled, GDB's internal \"physname\" code is checked against\n\
25747 NULL, show_check_physname,
25748 &setdebuglist, &showdebuglist);
25750 add_setshow_boolean_cmd ("use-deprecated-index-sections",
25751 no_class, &use_deprecated_index_sections, _("\
25752 Set whether to use deprecated gdb_index sections."), _("\
25753 Show whether to use deprecated gdb_index sections."), _("\
25754 When enabled, deprecated .gdb_index sections are used anyway.\n\
25755 Normally they are ignored either because of a missing feature or\n\
25756 performance issue.\n\
25757 Warning: This option must be enabled before gdb reads the file."),
25760 &setlist, &showlist);
25762 dwarf2_locexpr_index = register_symbol_computed_impl (LOC_COMPUTED,
25763 &dwarf2_locexpr_funcs);
25764 dwarf2_loclist_index = register_symbol_computed_impl (LOC_COMPUTED,
25765 &dwarf2_loclist_funcs);
25767 dwarf2_locexpr_block_index = register_symbol_block_impl (LOC_BLOCK,
25768 &dwarf2_block_frame_base_locexpr_funcs);
25769 dwarf2_loclist_block_index = register_symbol_block_impl (LOC_BLOCK,
25770 &dwarf2_block_frame_base_loclist_funcs);
25773 selftests::register_test ("dw2_expand_symtabs_matching",
25774 selftests::dw2_expand_symtabs_matching::run_test);