1 /* DWARF 2 debugging format support for GDB.
3 Copyright (C) 1994-2018 Free Software Foundation, Inc.
5 Adapted by Gary Funck (gary@intrepid.com), Intrepid Technology,
6 Inc. with support from Florida State University (under contract
7 with the Ada Joint Program Office), and Silicon Graphics, Inc.
8 Initial contribution by Brent Benson, Harris Computer Systems, Inc.,
9 based on Fred Fish's (Cygnus Support) implementation of DWARF 1
12 This file is part of GDB.
14 This program is free software; you can redistribute it and/or modify
15 it under the terms of the GNU General Public License as published by
16 the Free Software Foundation; either version 3 of the License, or
17 (at your option) any later version.
19 This program is distributed in the hope that it will be useful,
20 but WITHOUT ANY WARRANTY; without even the implied warranty of
21 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
22 GNU General Public License for more details.
24 You should have received a copy of the GNU General Public License
25 along with this program. If not, see <http://www.gnu.org/licenses/>. */
27 /* FIXME: Various die-reading functions need to be more careful with
28 reading off the end of the section.
29 E.g., load_partial_dies, read_partial_die. */
32 #include "dwarf2read.h"
33 #include "dwarf-index-common.h"
42 #include "gdb-demangle.h"
43 #include "expression.h"
44 #include "filenames.h" /* for DOSish file names */
47 #include "complaints.h"
49 #include "dwarf2expr.h"
50 #include "dwarf2loc.h"
51 #include "cp-support.h"
57 #include "typeprint.h"
60 #include "completer.h"
65 #include "gdbcore.h" /* for gnutarget */
66 #include "gdb/gdb-index.h"
71 #include "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>
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 /* The header of the compilation unit. */
424 struct comp_unit_head header {};
426 /* Base address of this compilation unit. */
427 CORE_ADDR base_address = 0;
429 /* Non-zero if base_address has been set. */
432 /* The language we are debugging. */
433 enum language language = language_unknown;
434 const struct language_defn *language_defn = nullptr;
436 const char *producer = nullptr;
438 /* The symtab builder for this CU. This is only non-NULL when full
439 symbols are being read. */
440 std::unique_ptr<buildsym_compunit> builder;
442 /* The generic symbol table building routines have separate lists for
443 file scope symbols and all all other scopes (local scopes). So
444 we need to select the right one to pass to add_symbol_to_list().
445 We do it by keeping a pointer to the correct list in list_in_scope.
447 FIXME: The original dwarf code just treated the file scope as the
448 first local scope, and all other local scopes as nested local
449 scopes, and worked fine. Check to see if we really need to
450 distinguish these in buildsym.c. */
451 struct pending **list_in_scope = nullptr;
453 /* Hash table holding all the loaded partial DIEs
454 with partial_die->offset.SECT_OFF as hash. */
455 htab_t partial_dies = nullptr;
457 /* Storage for things with the same lifetime as this read-in compilation
458 unit, including partial DIEs. */
459 auto_obstack comp_unit_obstack;
461 /* When multiple dwarf2_cu structures are living in memory, this field
462 chains them all together, so that they can be released efficiently.
463 We will probably also want a generation counter so that most-recently-used
464 compilation units are cached... */
465 struct dwarf2_per_cu_data *read_in_chain = nullptr;
467 /* Backlink to our per_cu entry. */
468 struct dwarf2_per_cu_data *per_cu;
470 /* How many compilation units ago was this CU last referenced? */
473 /* A hash table of DIE cu_offset for following references with
474 die_info->offset.sect_off as hash. */
475 htab_t die_hash = nullptr;
477 /* Full DIEs if read in. */
478 struct die_info *dies = nullptr;
480 /* A set of pointers to dwarf2_per_cu_data objects for compilation
481 units referenced by this one. Only set during full symbol processing;
482 partial symbol tables do not have dependencies. */
483 htab_t dependencies = nullptr;
485 /* Header data from the line table, during full symbol processing. */
486 struct line_header *line_header = nullptr;
487 /* Non-NULL if LINE_HEADER is owned by this DWARF_CU. Otherwise,
488 it's owned by dwarf2_per_objfile::line_header_hash. If non-NULL,
489 this is the DW_TAG_compile_unit die for this CU. We'll hold on
490 to the line header as long as this DIE is being processed. See
491 process_die_scope. */
492 die_info *line_header_die_owner = nullptr;
494 /* A list of methods which need to have physnames computed
495 after all type information has been read. */
496 std::vector<delayed_method_info> method_list;
498 /* To be copied to symtab->call_site_htab. */
499 htab_t call_site_htab = nullptr;
501 /* Non-NULL if this CU came from a DWO file.
502 There is an invariant here that is important to remember:
503 Except for attributes copied from the top level DIE in the "main"
504 (or "stub") file in preparation for reading the DWO file
505 (e.g., DW_AT_GNU_addr_base), we KISS: there is only *one* CU.
506 Either there isn't a DWO file (in which case this is NULL and the point
507 is moot), or there is and either we're not going to read it (in which
508 case this is NULL) or there is and we are reading it (in which case this
510 struct dwo_unit *dwo_unit = nullptr;
512 /* The DW_AT_addr_base attribute if present, zero otherwise
513 (zero is a valid value though).
514 Note this value comes from the Fission stub CU/TU's DIE. */
515 ULONGEST addr_base = 0;
517 /* The DW_AT_ranges_base attribute if present, zero otherwise
518 (zero is a valid value though).
519 Note this value comes from the Fission stub CU/TU's DIE.
520 Also note that the value is zero in the non-DWO case so this value can
521 be used without needing to know whether DWO files are in use or not.
522 N.B. This does not apply to DW_AT_ranges appearing in
523 DW_TAG_compile_unit dies. This is a bit of a wart, consider if ever
524 DW_AT_ranges appeared in the DW_TAG_compile_unit of DWO DIEs: then
525 DW_AT_ranges_base *would* have to be applied, and we'd have to care
526 whether the DW_AT_ranges attribute came from the skeleton or DWO. */
527 ULONGEST ranges_base = 0;
529 /* When reading debug info generated by older versions of rustc, we
530 have to rewrite some union types to be struct types with a
531 variant part. This rewriting must be done after the CU is fully
532 read in, because otherwise at the point of rewriting some struct
533 type might not have been fully processed. So, we keep a list of
534 all such types here and process them after expansion. */
535 std::vector<struct type *> rust_unions;
537 /* Mark used when releasing cached dies. */
538 unsigned int mark : 1;
540 /* This CU references .debug_loc. See the symtab->locations_valid field.
541 This test is imperfect as there may exist optimized debug code not using
542 any location list and still facing inlining issues if handled as
543 unoptimized code. For a future better test see GCC PR other/32998. */
544 unsigned int has_loclist : 1;
546 /* These cache the results for producer_is_* fields. CHECKED_PRODUCER is set
547 if all the producer_is_* fields are valid. This information is cached
548 because profiling CU expansion showed excessive time spent in
549 producer_is_gxx_lt_4_6. */
550 unsigned int checked_producer : 1;
551 unsigned int producer_is_gxx_lt_4_6 : 1;
552 unsigned int producer_is_gcc_lt_4_3 : 1;
553 unsigned int producer_is_icc_lt_14 : 1;
555 /* When set, the file that we're processing is known to have
556 debugging info for C++ namespaces. GCC 3.3.x did not produce
557 this information, but later versions do. */
559 unsigned int processing_has_namespace_info : 1;
561 struct partial_die_info *find_partial_die (sect_offset sect_off);
564 /* A struct that can be used as a hash key for tables based on DW_AT_stmt_list.
565 This includes type_unit_group and quick_file_names. */
567 struct stmt_list_hash
569 /* The DWO unit this table is from or NULL if there is none. */
570 struct dwo_unit *dwo_unit;
572 /* Offset in .debug_line or .debug_line.dwo. */
573 sect_offset line_sect_off;
576 /* Each element of dwarf2_per_objfile->type_unit_groups is a pointer to
577 an object of this type. */
579 struct type_unit_group
581 /* dwarf2read.c's main "handle" on a TU symtab.
582 To simplify things we create an artificial CU that "includes" all the
583 type units using this stmt_list so that the rest of the code still has
584 a "per_cu" handle on the symtab.
585 This PER_CU is recognized by having no section. */
586 #define IS_TYPE_UNIT_GROUP(per_cu) ((per_cu)->section == NULL)
587 struct dwarf2_per_cu_data per_cu;
589 /* The TUs that share this DW_AT_stmt_list entry.
590 This is added to while parsing type units to build partial symtabs,
591 and is deleted afterwards and not used again. */
592 VEC (sig_type_ptr) *tus;
594 /* The compunit symtab.
595 Type units in a group needn't all be defined in the same source file,
596 so we create an essentially anonymous symtab as the compunit symtab. */
597 struct compunit_symtab *compunit_symtab;
599 /* The data used to construct the hash key. */
600 struct stmt_list_hash hash;
602 /* The number of symtabs from the line header.
603 The value here must match line_header.num_file_names. */
604 unsigned int num_symtabs;
606 /* The symbol tables for this TU (obtained from the files listed in
608 WARNING: The order of entries here must match the order of entries
609 in the line header. After the first TU using this type_unit_group, the
610 line header for the subsequent TUs is recreated from this. This is done
611 because we need to use the same symtabs for each TU using the same
612 DW_AT_stmt_list value. Also note that symtabs may be repeated here,
613 there's no guarantee the line header doesn't have duplicate entries. */
614 struct symtab **symtabs;
617 /* These sections are what may appear in a (real or virtual) DWO file. */
621 struct dwarf2_section_info abbrev;
622 struct dwarf2_section_info line;
623 struct dwarf2_section_info loc;
624 struct dwarf2_section_info loclists;
625 struct dwarf2_section_info macinfo;
626 struct dwarf2_section_info macro;
627 struct dwarf2_section_info str;
628 struct dwarf2_section_info str_offsets;
629 /* In the case of a virtual DWO file, these two are unused. */
630 struct dwarf2_section_info info;
631 VEC (dwarf2_section_info_def) *types;
634 /* CUs/TUs in DWP/DWO files. */
638 /* Backlink to the containing struct dwo_file. */
639 struct dwo_file *dwo_file;
641 /* The "id" that distinguishes this CU/TU.
642 .debug_info calls this "dwo_id", .debug_types calls this "signature".
643 Since signatures came first, we stick with it for consistency. */
646 /* The section this CU/TU lives in, in the DWO file. */
647 struct dwarf2_section_info *section;
649 /* Same as dwarf2_per_cu_data:{sect_off,length} but in the DWO section. */
650 sect_offset sect_off;
653 /* For types, offset in the type's DIE of the type defined by this TU. */
654 cu_offset type_offset_in_tu;
657 /* include/dwarf2.h defines the DWP section codes.
658 It defines a max value but it doesn't define a min value, which we
659 use for error checking, so provide one. */
661 enum dwp_v2_section_ids
666 /* Data for one DWO file.
668 This includes virtual DWO files (a virtual DWO file is a DWO file as it
669 appears in a DWP file). DWP files don't really have DWO files per se -
670 comdat folding of types "loses" the DWO file they came from, and from
671 a high level view DWP files appear to contain a mass of random types.
672 However, to maintain consistency with the non-DWP case we pretend DWP
673 files contain virtual DWO files, and we assign each TU with one virtual
674 DWO file (generally based on the line and abbrev section offsets -
675 a heuristic that seems to work in practice). */
679 /* The DW_AT_GNU_dwo_name attribute.
680 For virtual DWO files the name is constructed from the section offsets
681 of abbrev,line,loc,str_offsets so that we combine virtual DWO files
682 from related CU+TUs. */
683 const char *dwo_name;
685 /* The DW_AT_comp_dir attribute. */
686 const char *comp_dir;
688 /* The bfd, when the file is open. Otherwise this is NULL.
689 This is unused(NULL) for virtual DWO files where we use dwp_file.dbfd. */
692 /* The sections that make up this DWO file.
693 Remember that for virtual DWO files in DWP V2, these are virtual
694 sections (for lack of a better name). */
695 struct dwo_sections sections;
697 /* The CUs in the file.
698 Each element is a struct dwo_unit. Multiple CUs per DWO are supported as
699 an extension to handle LLVM's Link Time Optimization output (where
700 multiple source files may be compiled into a single object/dwo pair). */
703 /* Table of TUs in the file.
704 Each element is a struct dwo_unit. */
708 /* These sections are what may appear in a DWP file. */
712 /* These are used by both DWP version 1 and 2. */
713 struct dwarf2_section_info str;
714 struct dwarf2_section_info cu_index;
715 struct dwarf2_section_info tu_index;
717 /* These are only used by DWP version 2 files.
718 In DWP version 1 the .debug_info.dwo, .debug_types.dwo, and other
719 sections are referenced by section number, and are not recorded here.
720 In DWP version 2 there is at most one copy of all these sections, each
721 section being (effectively) comprised of the concatenation of all of the
722 individual sections that exist in the version 1 format.
723 To keep the code simple we treat each of these concatenated pieces as a
724 section itself (a virtual section?). */
725 struct dwarf2_section_info abbrev;
726 struct dwarf2_section_info info;
727 struct dwarf2_section_info line;
728 struct dwarf2_section_info loc;
729 struct dwarf2_section_info macinfo;
730 struct dwarf2_section_info macro;
731 struct dwarf2_section_info str_offsets;
732 struct dwarf2_section_info types;
735 /* These sections are what may appear in a virtual DWO file in DWP version 1.
736 A virtual DWO file is a DWO file as it appears in a DWP file. */
738 struct virtual_v1_dwo_sections
740 struct dwarf2_section_info abbrev;
741 struct dwarf2_section_info line;
742 struct dwarf2_section_info loc;
743 struct dwarf2_section_info macinfo;
744 struct dwarf2_section_info macro;
745 struct dwarf2_section_info str_offsets;
746 /* Each DWP hash table entry records one CU or one TU.
747 That is recorded here, and copied to dwo_unit.section. */
748 struct dwarf2_section_info info_or_types;
751 /* Similar to virtual_v1_dwo_sections, but for DWP version 2.
752 In version 2, the sections of the DWO files are concatenated together
753 and stored in one section of that name. Thus each ELF section contains
754 several "virtual" sections. */
756 struct virtual_v2_dwo_sections
758 bfd_size_type abbrev_offset;
759 bfd_size_type abbrev_size;
761 bfd_size_type line_offset;
762 bfd_size_type line_size;
764 bfd_size_type loc_offset;
765 bfd_size_type loc_size;
767 bfd_size_type macinfo_offset;
768 bfd_size_type macinfo_size;
770 bfd_size_type macro_offset;
771 bfd_size_type macro_size;
773 bfd_size_type str_offsets_offset;
774 bfd_size_type str_offsets_size;
776 /* Each DWP hash table entry records one CU or one TU.
777 That is recorded here, and copied to dwo_unit.section. */
778 bfd_size_type info_or_types_offset;
779 bfd_size_type info_or_types_size;
782 /* Contents of DWP hash tables. */
784 struct dwp_hash_table
786 uint32_t version, nr_columns;
787 uint32_t nr_units, nr_slots;
788 const gdb_byte *hash_table, *unit_table;
793 const gdb_byte *indices;
797 /* This is indexed by column number and gives the id of the section
799 #define MAX_NR_V2_DWO_SECTIONS \
800 (1 /* .debug_info or .debug_types */ \
801 + 1 /* .debug_abbrev */ \
802 + 1 /* .debug_line */ \
803 + 1 /* .debug_loc */ \
804 + 1 /* .debug_str_offsets */ \
805 + 1 /* .debug_macro or .debug_macinfo */)
806 int section_ids[MAX_NR_V2_DWO_SECTIONS];
807 const gdb_byte *offsets;
808 const gdb_byte *sizes;
813 /* Data for one DWP file. */
817 dwp_file (const char *name_, gdb_bfd_ref_ptr &&abfd)
819 dbfd (std::move (abfd))
823 /* Name of the file. */
826 /* File format version. */
830 gdb_bfd_ref_ptr dbfd;
832 /* Section info for this file. */
833 struct dwp_sections sections {};
835 /* Table of CUs in the file. */
836 const struct dwp_hash_table *cus = nullptr;
838 /* Table of TUs in the file. */
839 const struct dwp_hash_table *tus = nullptr;
841 /* Tables of loaded CUs/TUs. Each entry is a struct dwo_unit *. */
842 htab_t loaded_cus {};
843 htab_t loaded_tus {};
845 /* Table to map ELF section numbers to their sections.
846 This is only needed for the DWP V1 file format. */
847 unsigned int num_sections = 0;
848 asection **elf_sections = nullptr;
851 /* This represents a '.dwz' file. */
855 dwz_file (gdb_bfd_ref_ptr &&bfd)
856 : dwz_bfd (std::move (bfd))
860 /* A dwz file can only contain a few sections. */
861 struct dwarf2_section_info abbrev {};
862 struct dwarf2_section_info info {};
863 struct dwarf2_section_info str {};
864 struct dwarf2_section_info line {};
865 struct dwarf2_section_info macro {};
866 struct dwarf2_section_info gdb_index {};
867 struct dwarf2_section_info debug_names {};
870 gdb_bfd_ref_ptr dwz_bfd;
873 /* Struct used to pass misc. parameters to read_die_and_children, et
874 al. which are used for both .debug_info and .debug_types dies.
875 All parameters here are unchanging for the life of the call. This
876 struct exists to abstract away the constant parameters of die reading. */
878 struct die_reader_specs
880 /* The bfd of die_section. */
883 /* The CU of the DIE we are parsing. */
884 struct dwarf2_cu *cu;
886 /* Non-NULL if reading a DWO file (including one packaged into a DWP). */
887 struct dwo_file *dwo_file;
889 /* The section the die comes from.
890 This is either .debug_info or .debug_types, or the .dwo variants. */
891 struct dwarf2_section_info *die_section;
893 /* die_section->buffer. */
894 const gdb_byte *buffer;
896 /* The end of the buffer. */
897 const gdb_byte *buffer_end;
899 /* The value of the DW_AT_comp_dir attribute. */
900 const char *comp_dir;
902 /* The abbreviation table to use when reading the DIEs. */
903 struct abbrev_table *abbrev_table;
906 /* Type of function passed to init_cutu_and_read_dies, et.al. */
907 typedef void (die_reader_func_ftype) (const struct die_reader_specs *reader,
908 const gdb_byte *info_ptr,
909 struct die_info *comp_unit_die,
913 /* A 1-based directory index. This is a strong typedef to prevent
914 accidentally using a directory index as a 0-based index into an
916 enum class dir_index : unsigned int {};
918 /* Likewise, a 1-based file name index. */
919 enum class file_name_index : unsigned int {};
923 file_entry () = default;
925 file_entry (const char *name_, dir_index d_index_,
926 unsigned int mod_time_, unsigned int length_)
929 mod_time (mod_time_),
933 /* Return the include directory at D_INDEX stored in LH. Returns
934 NULL if D_INDEX is out of bounds. */
935 const char *include_dir (const line_header *lh) const;
937 /* The file name. Note this is an observing pointer. The memory is
938 owned by debug_line_buffer. */
941 /* The directory index (1-based). */
942 dir_index d_index {};
944 unsigned int mod_time {};
946 unsigned int length {};
948 /* True if referenced by the Line Number Program. */
951 /* The associated symbol table, if any. */
952 struct symtab *symtab {};
955 /* The line number information for a compilation unit (found in the
956 .debug_line section) begins with a "statement program header",
957 which contains the following information. */
964 /* Add an entry to the include directory table. */
965 void add_include_dir (const char *include_dir);
967 /* Add an entry to the file name table. */
968 void add_file_name (const char *name, dir_index d_index,
969 unsigned int mod_time, unsigned int length);
971 /* Return the include dir at INDEX (1-based). Returns NULL if INDEX
973 const char *include_dir_at (dir_index index) const
975 /* Convert directory index number (1-based) to vector index
977 size_t vec_index = to_underlying (index) - 1;
979 if (vec_index >= include_dirs.size ())
981 return include_dirs[vec_index];
984 /* Return the file name at INDEX (1-based). Returns NULL if INDEX
986 file_entry *file_name_at (file_name_index index)
988 /* Convert file name index number (1-based) to vector index
990 size_t vec_index = to_underlying (index) - 1;
992 if (vec_index >= file_names.size ())
994 return &file_names[vec_index];
997 /* Const version of the above. */
998 const file_entry *file_name_at (unsigned int index) const
1000 if (index >= file_names.size ())
1002 return &file_names[index];
1005 /* Offset of line number information in .debug_line section. */
1006 sect_offset sect_off {};
1008 /* OFFSET is for struct dwz_file associated with dwarf2_per_objfile. */
1009 unsigned offset_in_dwz : 1; /* Can't initialize bitfields in-class. */
1011 unsigned int total_length {};
1012 unsigned short version {};
1013 unsigned int header_length {};
1014 unsigned char minimum_instruction_length {};
1015 unsigned char maximum_ops_per_instruction {};
1016 unsigned char default_is_stmt {};
1018 unsigned char line_range {};
1019 unsigned char opcode_base {};
1021 /* standard_opcode_lengths[i] is the number of operands for the
1022 standard opcode whose value is i. This means that
1023 standard_opcode_lengths[0] is unused, and the last meaningful
1024 element is standard_opcode_lengths[opcode_base - 1]. */
1025 std::unique_ptr<unsigned char[]> standard_opcode_lengths;
1027 /* The include_directories table. Note these are observing
1028 pointers. The memory is owned by debug_line_buffer. */
1029 std::vector<const char *> include_dirs;
1031 /* The file_names table. */
1032 std::vector<file_entry> file_names;
1034 /* The start and end of the statement program following this
1035 header. These point into dwarf2_per_objfile->line_buffer. */
1036 const gdb_byte *statement_program_start {}, *statement_program_end {};
1039 typedef std::unique_ptr<line_header> line_header_up;
1042 file_entry::include_dir (const line_header *lh) const
1044 return lh->include_dir_at (d_index);
1047 /* When we construct a partial symbol table entry we only
1048 need this much information. */
1049 struct partial_die_info : public allocate_on_obstack
1051 partial_die_info (sect_offset sect_off, struct abbrev_info *abbrev);
1053 /* Disable assign but still keep copy ctor, which is needed
1054 load_partial_dies. */
1055 partial_die_info& operator=(const partial_die_info& rhs) = delete;
1057 /* Adjust the partial die before generating a symbol for it. This
1058 function may set the is_external flag or change the DIE's
1060 void fixup (struct dwarf2_cu *cu);
1062 /* Read a minimal amount of information into the minimal die
1064 const gdb_byte *read (const struct die_reader_specs *reader,
1065 const struct abbrev_info &abbrev,
1066 const gdb_byte *info_ptr);
1068 /* Offset of this DIE. */
1069 const sect_offset sect_off;
1071 /* DWARF-2 tag for this DIE. */
1072 const ENUM_BITFIELD(dwarf_tag) tag : 16;
1074 /* Assorted flags describing the data found in this DIE. */
1075 const unsigned int has_children : 1;
1077 unsigned int is_external : 1;
1078 unsigned int is_declaration : 1;
1079 unsigned int has_type : 1;
1080 unsigned int has_specification : 1;
1081 unsigned int has_pc_info : 1;
1082 unsigned int may_be_inlined : 1;
1084 /* This DIE has been marked DW_AT_main_subprogram. */
1085 unsigned int main_subprogram : 1;
1087 /* Flag set if the SCOPE field of this structure has been
1089 unsigned int scope_set : 1;
1091 /* Flag set if the DIE has a byte_size attribute. */
1092 unsigned int has_byte_size : 1;
1094 /* Flag set if the DIE has a DW_AT_const_value attribute. */
1095 unsigned int has_const_value : 1;
1097 /* Flag set if any of the DIE's children are template arguments. */
1098 unsigned int has_template_arguments : 1;
1100 /* Flag set if fixup has been called on this die. */
1101 unsigned int fixup_called : 1;
1103 /* Flag set if DW_TAG_imported_unit uses DW_FORM_GNU_ref_alt. */
1104 unsigned int is_dwz : 1;
1106 /* Flag set if spec_offset uses DW_FORM_GNU_ref_alt. */
1107 unsigned int spec_is_dwz : 1;
1109 /* The name of this DIE. Normally the value of DW_AT_name, but
1110 sometimes a default name for unnamed DIEs. */
1111 const char *name = nullptr;
1113 /* The linkage name, if present. */
1114 const char *linkage_name = nullptr;
1116 /* The scope to prepend to our children. This is generally
1117 allocated on the comp_unit_obstack, so will disappear
1118 when this compilation unit leaves the cache. */
1119 const char *scope = nullptr;
1121 /* Some data associated with the partial DIE. The tag determines
1122 which field is live. */
1125 /* The location description associated with this DIE, if any. */
1126 struct dwarf_block *locdesc;
1127 /* The offset of an import, for DW_TAG_imported_unit. */
1128 sect_offset sect_off;
1131 /* If HAS_PC_INFO, the PC range associated with this DIE. */
1132 CORE_ADDR lowpc = 0;
1133 CORE_ADDR highpc = 0;
1135 /* Pointer into the info_buffer (or types_buffer) pointing at the target of
1136 DW_AT_sibling, if any. */
1137 /* NOTE: This member isn't strictly necessary, partial_die_info::read
1138 could return DW_AT_sibling values to its caller load_partial_dies. */
1139 const gdb_byte *sibling = nullptr;
1141 /* If HAS_SPECIFICATION, the offset of the DIE referred to by
1142 DW_AT_specification (or DW_AT_abstract_origin or
1143 DW_AT_extension). */
1144 sect_offset spec_offset {};
1146 /* Pointers to this DIE's parent, first child, and next sibling,
1148 struct partial_die_info *die_parent = nullptr;
1149 struct partial_die_info *die_child = nullptr;
1150 struct partial_die_info *die_sibling = nullptr;
1152 friend struct partial_die_info *
1153 dwarf2_cu::find_partial_die (sect_offset sect_off);
1156 /* Only need to do look up in dwarf2_cu::find_partial_die. */
1157 partial_die_info (sect_offset sect_off)
1158 : partial_die_info (sect_off, DW_TAG_padding, 0)
1162 partial_die_info (sect_offset sect_off_, enum dwarf_tag tag_,
1164 : sect_off (sect_off_), tag (tag_), has_children (has_children_)
1169 has_specification = 0;
1172 main_subprogram = 0;
1175 has_const_value = 0;
1176 has_template_arguments = 0;
1183 /* This data structure holds the information of an abbrev. */
1186 unsigned int number; /* number identifying abbrev */
1187 enum dwarf_tag tag; /* dwarf tag */
1188 unsigned short has_children; /* boolean */
1189 unsigned short num_attrs; /* number of attributes */
1190 struct attr_abbrev *attrs; /* an array of attribute descriptions */
1191 struct abbrev_info *next; /* next in chain */
1196 ENUM_BITFIELD(dwarf_attribute) name : 16;
1197 ENUM_BITFIELD(dwarf_form) form : 16;
1199 /* It is valid only if FORM is DW_FORM_implicit_const. */
1200 LONGEST implicit_const;
1203 /* Size of abbrev_table.abbrev_hash_table. */
1204 #define ABBREV_HASH_SIZE 121
1206 /* Top level data structure to contain an abbreviation table. */
1210 explicit abbrev_table (sect_offset off)
1214 XOBNEWVEC (&abbrev_obstack, struct abbrev_info *, ABBREV_HASH_SIZE);
1215 memset (m_abbrevs, 0, ABBREV_HASH_SIZE * sizeof (struct abbrev_info *));
1218 DISABLE_COPY_AND_ASSIGN (abbrev_table);
1220 /* Allocate space for a struct abbrev_info object in
1222 struct abbrev_info *alloc_abbrev ();
1224 /* Add an abbreviation to the table. */
1225 void add_abbrev (unsigned int abbrev_number, struct abbrev_info *abbrev);
1227 /* Look up an abbrev in the table.
1228 Returns NULL if the abbrev is not found. */
1230 struct abbrev_info *lookup_abbrev (unsigned int abbrev_number);
1233 /* Where the abbrev table came from.
1234 This is used as a sanity check when the table is used. */
1235 const sect_offset sect_off;
1237 /* Storage for the abbrev table. */
1238 auto_obstack abbrev_obstack;
1242 /* Hash table of abbrevs.
1243 This is an array of size ABBREV_HASH_SIZE allocated in abbrev_obstack.
1244 It could be statically allocated, but the previous code didn't so we
1246 struct abbrev_info **m_abbrevs;
1249 typedef std::unique_ptr<struct abbrev_table> abbrev_table_up;
1251 /* Attributes have a name and a value. */
1254 ENUM_BITFIELD(dwarf_attribute) name : 16;
1255 ENUM_BITFIELD(dwarf_form) form : 15;
1257 /* Has DW_STRING already been updated by dwarf2_canonicalize_name? This
1258 field should be in u.str (existing only for DW_STRING) but it is kept
1259 here for better struct attribute alignment. */
1260 unsigned int string_is_canonical : 1;
1265 struct dwarf_block *blk;
1274 /* This data structure holds a complete die structure. */
1277 /* DWARF-2 tag for this DIE. */
1278 ENUM_BITFIELD(dwarf_tag) tag : 16;
1280 /* Number of attributes */
1281 unsigned char num_attrs;
1283 /* True if we're presently building the full type name for the
1284 type derived from this DIE. */
1285 unsigned char building_fullname : 1;
1287 /* True if this die is in process. PR 16581. */
1288 unsigned char in_process : 1;
1291 unsigned int abbrev;
1293 /* Offset in .debug_info or .debug_types section. */
1294 sect_offset sect_off;
1296 /* The dies in a compilation unit form an n-ary tree. PARENT
1297 points to this die's parent; CHILD points to the first child of
1298 this node; and all the children of a given node are chained
1299 together via their SIBLING fields. */
1300 struct die_info *child; /* Its first child, if any. */
1301 struct die_info *sibling; /* Its next sibling, if any. */
1302 struct die_info *parent; /* Its parent, if any. */
1304 /* An array of attributes, with NUM_ATTRS elements. There may be
1305 zero, but it's not common and zero-sized arrays are not
1306 sufficiently portable C. */
1307 struct attribute attrs[1];
1310 /* Get at parts of an attribute structure. */
1312 #define DW_STRING(attr) ((attr)->u.str)
1313 #define DW_STRING_IS_CANONICAL(attr) ((attr)->string_is_canonical)
1314 #define DW_UNSND(attr) ((attr)->u.unsnd)
1315 #define DW_BLOCK(attr) ((attr)->u.blk)
1316 #define DW_SND(attr) ((attr)->u.snd)
1317 #define DW_ADDR(attr) ((attr)->u.addr)
1318 #define DW_SIGNATURE(attr) ((attr)->u.signature)
1320 /* Blocks are a bunch of untyped bytes. */
1325 /* Valid only if SIZE is not zero. */
1326 const gdb_byte *data;
1329 #ifndef ATTR_ALLOC_CHUNK
1330 #define ATTR_ALLOC_CHUNK 4
1333 /* Allocate fields for structs, unions and enums in this size. */
1334 #ifndef DW_FIELD_ALLOC_CHUNK
1335 #define DW_FIELD_ALLOC_CHUNK 4
1338 /* FIXME: We might want to set this from BFD via bfd_arch_bits_per_byte,
1339 but this would require a corresponding change in unpack_field_as_long
1341 static int bits_per_byte = 8;
1343 /* When reading a variant or variant part, we track a bit more
1344 information about the field, and store it in an object of this
1347 struct variant_field
1349 /* If we see a DW_TAG_variant, then this will be the discriminant
1351 ULONGEST discriminant_value;
1352 /* If we see a DW_TAG_variant, then this will be set if this is the
1354 bool default_branch;
1355 /* While reading a DW_TAG_variant_part, this will be set if this
1356 field is the discriminant. */
1357 bool is_discriminant;
1362 int accessibility = 0;
1364 /* Extra information to describe a variant or variant part. */
1365 struct variant_field variant {};
1366 struct field field {};
1371 const char *name = nullptr;
1372 std::vector<struct fn_field> fnfields;
1375 /* The routines that read and process dies for a C struct or C++ class
1376 pass lists of data member fields and lists of member function fields
1377 in an instance of a field_info structure, as defined below. */
1380 /* List of data member and baseclasses fields. */
1381 std::vector<struct nextfield> fields;
1382 std::vector<struct nextfield> baseclasses;
1384 /* Number of fields (including baseclasses). */
1387 /* Set if the accesibility of one of the fields is not public. */
1388 int non_public_fields = 0;
1390 /* Member function fieldlist array, contains name of possibly overloaded
1391 member function, number of overloaded member functions and a pointer
1392 to the head of the member function field chain. */
1393 std::vector<struct fnfieldlist> fnfieldlists;
1395 /* typedefs defined inside this class. TYPEDEF_FIELD_LIST contains head of
1396 a NULL terminated list of TYPEDEF_FIELD_LIST_COUNT elements. */
1397 std::vector<struct decl_field> typedef_field_list;
1399 /* Nested types defined by this class and the number of elements in this
1401 std::vector<struct decl_field> nested_types_list;
1404 /* One item on the queue of compilation units to read in full symbols
1406 struct dwarf2_queue_item
1408 struct dwarf2_per_cu_data *per_cu;
1409 enum language pretend_language;
1410 struct dwarf2_queue_item *next;
1413 /* The current queue. */
1414 static struct dwarf2_queue_item *dwarf2_queue, *dwarf2_queue_tail;
1416 /* Loaded secondary compilation units are kept in memory until they
1417 have not been referenced for the processing of this many
1418 compilation units. Set this to zero to disable caching. Cache
1419 sizes of up to at least twenty will improve startup time for
1420 typical inter-CU-reference binaries, at an obvious memory cost. */
1421 static int dwarf_max_cache_age = 5;
1423 show_dwarf_max_cache_age (struct ui_file *file, int from_tty,
1424 struct cmd_list_element *c, const char *value)
1426 fprintf_filtered (file, _("The upper bound on the age of cached "
1427 "DWARF compilation units is %s.\n"),
1431 /* local function prototypes */
1433 static const char *get_section_name (const struct dwarf2_section_info *);
1435 static const char *get_section_file_name (const struct dwarf2_section_info *);
1437 static void dwarf2_find_base_address (struct die_info *die,
1438 struct dwarf2_cu *cu);
1440 static struct partial_symtab *create_partial_symtab
1441 (struct dwarf2_per_cu_data *per_cu, const char *name);
1443 static void build_type_psymtabs_reader (const struct die_reader_specs *reader,
1444 const gdb_byte *info_ptr,
1445 struct die_info *type_unit_die,
1446 int has_children, void *data);
1448 static void dwarf2_build_psymtabs_hard
1449 (struct dwarf2_per_objfile *dwarf2_per_objfile);
1451 static void scan_partial_symbols (struct partial_die_info *,
1452 CORE_ADDR *, CORE_ADDR *,
1453 int, struct dwarf2_cu *);
1455 static void add_partial_symbol (struct partial_die_info *,
1456 struct dwarf2_cu *);
1458 static void add_partial_namespace (struct partial_die_info *pdi,
1459 CORE_ADDR *lowpc, CORE_ADDR *highpc,
1460 int set_addrmap, struct dwarf2_cu *cu);
1462 static void add_partial_module (struct partial_die_info *pdi, CORE_ADDR *lowpc,
1463 CORE_ADDR *highpc, int set_addrmap,
1464 struct dwarf2_cu *cu);
1466 static void add_partial_enumeration (struct partial_die_info *enum_pdi,
1467 struct dwarf2_cu *cu);
1469 static void add_partial_subprogram (struct partial_die_info *pdi,
1470 CORE_ADDR *lowpc, CORE_ADDR *highpc,
1471 int need_pc, struct dwarf2_cu *cu);
1473 static void dwarf2_read_symtab (struct partial_symtab *,
1476 static void psymtab_to_symtab_1 (struct partial_symtab *);
1478 static abbrev_table_up abbrev_table_read_table
1479 (struct dwarf2_per_objfile *dwarf2_per_objfile, struct dwarf2_section_info *,
1482 static unsigned int peek_abbrev_code (bfd *, const gdb_byte *);
1484 static struct partial_die_info *load_partial_dies
1485 (const struct die_reader_specs *, const gdb_byte *, int);
1487 static struct partial_die_info *find_partial_die (sect_offset, int,
1488 struct dwarf2_cu *);
1490 static const gdb_byte *read_attribute (const struct die_reader_specs *,
1491 struct attribute *, struct attr_abbrev *,
1494 static unsigned int read_1_byte (bfd *, const gdb_byte *);
1496 static int read_1_signed_byte (bfd *, const gdb_byte *);
1498 static unsigned int read_2_bytes (bfd *, const gdb_byte *);
1500 static unsigned int read_4_bytes (bfd *, const gdb_byte *);
1502 static ULONGEST read_8_bytes (bfd *, const gdb_byte *);
1504 static CORE_ADDR read_address (bfd *, const gdb_byte *ptr, struct dwarf2_cu *,
1507 static LONGEST read_initial_length (bfd *, const gdb_byte *, unsigned int *);
1509 static LONGEST read_checked_initial_length_and_offset
1510 (bfd *, const gdb_byte *, const struct comp_unit_head *,
1511 unsigned int *, unsigned int *);
1513 static LONGEST read_offset (bfd *, const gdb_byte *,
1514 const struct comp_unit_head *,
1517 static LONGEST read_offset_1 (bfd *, const gdb_byte *, unsigned int);
1519 static sect_offset read_abbrev_offset
1520 (struct dwarf2_per_objfile *dwarf2_per_objfile,
1521 struct dwarf2_section_info *, sect_offset);
1523 static const gdb_byte *read_n_bytes (bfd *, const gdb_byte *, unsigned int);
1525 static const char *read_direct_string (bfd *, const gdb_byte *, unsigned int *);
1527 static const char *read_indirect_string
1528 (struct dwarf2_per_objfile *dwarf2_per_objfile, bfd *, const gdb_byte *,
1529 const struct comp_unit_head *, unsigned int *);
1531 static const char *read_indirect_line_string
1532 (struct dwarf2_per_objfile *dwarf2_per_objfile, bfd *, const gdb_byte *,
1533 const struct comp_unit_head *, unsigned int *);
1535 static const char *read_indirect_string_at_offset
1536 (struct dwarf2_per_objfile *dwarf2_per_objfile, bfd *abfd,
1537 LONGEST str_offset);
1539 static const char *read_indirect_string_from_dwz
1540 (struct objfile *objfile, struct dwz_file *, LONGEST);
1542 static LONGEST read_signed_leb128 (bfd *, const gdb_byte *, unsigned int *);
1544 static CORE_ADDR read_addr_index_from_leb128 (struct dwarf2_cu *,
1548 static const char *read_str_index (const struct die_reader_specs *reader,
1549 ULONGEST str_index);
1551 static void set_cu_language (unsigned int, struct dwarf2_cu *);
1553 static struct attribute *dwarf2_attr (struct die_info *, unsigned int,
1554 struct dwarf2_cu *);
1556 static struct attribute *dwarf2_attr_no_follow (struct die_info *,
1559 static const char *dwarf2_string_attr (struct die_info *die, unsigned int name,
1560 struct dwarf2_cu *cu);
1562 static int dwarf2_flag_true_p (struct die_info *die, unsigned name,
1563 struct dwarf2_cu *cu);
1565 static int die_is_declaration (struct die_info *, struct dwarf2_cu *cu);
1567 static struct die_info *die_specification (struct die_info *die,
1568 struct dwarf2_cu **);
1570 static line_header_up dwarf_decode_line_header (sect_offset sect_off,
1571 struct dwarf2_cu *cu);
1573 static void dwarf_decode_lines (struct line_header *, const char *,
1574 struct dwarf2_cu *, struct partial_symtab *,
1575 CORE_ADDR, int decode_mapping);
1577 static void dwarf2_start_subfile (struct dwarf2_cu *, const char *,
1580 static struct compunit_symtab *dwarf2_start_symtab (struct dwarf2_cu *,
1581 const char *, const char *,
1584 static struct symbol *new_symbol (struct die_info *, struct type *,
1585 struct dwarf2_cu *, struct symbol * = NULL);
1587 static void dwarf2_const_value (const struct attribute *, struct symbol *,
1588 struct dwarf2_cu *);
1590 static void dwarf2_const_value_attr (const struct attribute *attr,
1593 struct obstack *obstack,
1594 struct dwarf2_cu *cu, LONGEST *value,
1595 const gdb_byte **bytes,
1596 struct dwarf2_locexpr_baton **baton);
1598 static struct type *die_type (struct die_info *, struct dwarf2_cu *);
1600 static int need_gnat_info (struct dwarf2_cu *);
1602 static struct type *die_descriptive_type (struct die_info *,
1603 struct dwarf2_cu *);
1605 static void set_descriptive_type (struct type *, struct die_info *,
1606 struct dwarf2_cu *);
1608 static struct type *die_containing_type (struct die_info *,
1609 struct dwarf2_cu *);
1611 static struct type *lookup_die_type (struct die_info *, const struct attribute *,
1612 struct dwarf2_cu *);
1614 static struct type *read_type_die (struct die_info *, struct dwarf2_cu *);
1616 static struct type *read_type_die_1 (struct die_info *, struct dwarf2_cu *);
1618 static const char *determine_prefix (struct die_info *die, struct dwarf2_cu *);
1620 static char *typename_concat (struct obstack *obs, const char *prefix,
1621 const char *suffix, int physname,
1622 struct dwarf2_cu *cu);
1624 static void read_file_scope (struct die_info *, struct dwarf2_cu *);
1626 static void read_type_unit_scope (struct die_info *, struct dwarf2_cu *);
1628 static void read_func_scope (struct die_info *, struct dwarf2_cu *);
1630 static void read_lexical_block_scope (struct die_info *, struct dwarf2_cu *);
1632 static void read_call_site_scope (struct die_info *die, struct dwarf2_cu *cu);
1634 static void read_variable (struct die_info *die, struct dwarf2_cu *cu);
1636 static int dwarf2_ranges_read (unsigned, CORE_ADDR *, CORE_ADDR *,
1637 struct dwarf2_cu *, struct partial_symtab *);
1639 /* How dwarf2_get_pc_bounds constructed its *LOWPC and *HIGHPC return
1640 values. Keep the items ordered with increasing constraints compliance. */
1643 /* No attribute DW_AT_low_pc, DW_AT_high_pc or DW_AT_ranges was found. */
1644 PC_BOUNDS_NOT_PRESENT,
1646 /* Some of the attributes DW_AT_low_pc, DW_AT_high_pc or DW_AT_ranges
1647 were present but they do not form a valid range of PC addresses. */
1650 /* Discontiguous range was found - that is DW_AT_ranges was found. */
1653 /* Contiguous range was found - DW_AT_low_pc and DW_AT_high_pc were found. */
1657 static enum pc_bounds_kind dwarf2_get_pc_bounds (struct die_info *,
1658 CORE_ADDR *, CORE_ADDR *,
1660 struct partial_symtab *);
1662 static void get_scope_pc_bounds (struct die_info *,
1663 CORE_ADDR *, CORE_ADDR *,
1664 struct dwarf2_cu *);
1666 static void dwarf2_record_block_ranges (struct die_info *, struct block *,
1667 CORE_ADDR, struct dwarf2_cu *);
1669 static void dwarf2_add_field (struct field_info *, struct die_info *,
1670 struct dwarf2_cu *);
1672 static void dwarf2_attach_fields_to_type (struct field_info *,
1673 struct type *, struct dwarf2_cu *);
1675 static void dwarf2_add_member_fn (struct field_info *,
1676 struct die_info *, struct type *,
1677 struct dwarf2_cu *);
1679 static void dwarf2_attach_fn_fields_to_type (struct field_info *,
1681 struct dwarf2_cu *);
1683 static void process_structure_scope (struct die_info *, struct dwarf2_cu *);
1685 static void read_common_block (struct die_info *, struct dwarf2_cu *);
1687 static void read_namespace (struct die_info *die, struct dwarf2_cu *);
1689 static void read_module (struct die_info *die, struct dwarf2_cu *cu);
1691 static struct using_direct **using_directives (struct dwarf2_cu *cu);
1693 static void read_import_statement (struct die_info *die, struct dwarf2_cu *);
1695 static int read_namespace_alias (struct die_info *die, struct dwarf2_cu *cu);
1697 static struct type *read_module_type (struct die_info *die,
1698 struct dwarf2_cu *cu);
1700 static const char *namespace_name (struct die_info *die,
1701 int *is_anonymous, struct dwarf2_cu *);
1703 static void process_enumeration_scope (struct die_info *, struct dwarf2_cu *);
1705 static CORE_ADDR decode_locdesc (struct dwarf_block *, struct dwarf2_cu *);
1707 static enum dwarf_array_dim_ordering read_array_order (struct die_info *,
1708 struct dwarf2_cu *);
1710 static struct die_info *read_die_and_siblings_1
1711 (const struct die_reader_specs *, const gdb_byte *, const gdb_byte **,
1714 static struct die_info *read_die_and_siblings (const struct die_reader_specs *,
1715 const gdb_byte *info_ptr,
1716 const gdb_byte **new_info_ptr,
1717 struct die_info *parent);
1719 static const gdb_byte *read_full_die_1 (const struct die_reader_specs *,
1720 struct die_info **, const gdb_byte *,
1723 static const gdb_byte *read_full_die (const struct die_reader_specs *,
1724 struct die_info **, const gdb_byte *,
1727 static void process_die (struct die_info *, struct dwarf2_cu *);
1729 static const char *dwarf2_canonicalize_name (const char *, struct dwarf2_cu *,
1732 static const char *dwarf2_name (struct die_info *die, struct dwarf2_cu *);
1734 static const char *dwarf2_full_name (const char *name,
1735 struct die_info *die,
1736 struct dwarf2_cu *cu);
1738 static const char *dwarf2_physname (const char *name, struct die_info *die,
1739 struct dwarf2_cu *cu);
1741 static struct die_info *dwarf2_extension (struct die_info *die,
1742 struct dwarf2_cu **);
1744 static const char *dwarf_tag_name (unsigned int);
1746 static const char *dwarf_attr_name (unsigned int);
1748 static const char *dwarf_form_name (unsigned int);
1750 static const char *dwarf_bool_name (unsigned int);
1752 static const char *dwarf_type_encoding_name (unsigned int);
1754 static struct die_info *sibling_die (struct die_info *);
1756 static void dump_die_shallow (struct ui_file *, int indent, struct die_info *);
1758 static void dump_die_for_error (struct die_info *);
1760 static void dump_die_1 (struct ui_file *, int level, int max_level,
1763 /*static*/ void dump_die (struct die_info *, int max_level);
1765 static void store_in_ref_table (struct die_info *,
1766 struct dwarf2_cu *);
1768 static sect_offset dwarf2_get_ref_die_offset (const struct attribute *);
1770 static LONGEST dwarf2_get_attr_constant_value (const struct attribute *, int);
1772 static struct die_info *follow_die_ref_or_sig (struct die_info *,
1773 const struct attribute *,
1774 struct dwarf2_cu **);
1776 static struct die_info *follow_die_ref (struct die_info *,
1777 const struct attribute *,
1778 struct dwarf2_cu **);
1780 static struct die_info *follow_die_sig (struct die_info *,
1781 const struct attribute *,
1782 struct dwarf2_cu **);
1784 static struct type *get_signatured_type (struct die_info *, ULONGEST,
1785 struct dwarf2_cu *);
1787 static struct type *get_DW_AT_signature_type (struct die_info *,
1788 const struct attribute *,
1789 struct dwarf2_cu *);
1791 static void load_full_type_unit (struct dwarf2_per_cu_data *per_cu);
1793 static void read_signatured_type (struct signatured_type *);
1795 static int attr_to_dynamic_prop (const struct attribute *attr,
1796 struct die_info *die, struct dwarf2_cu *cu,
1797 struct dynamic_prop *prop);
1799 /* memory allocation interface */
1801 static struct dwarf_block *dwarf_alloc_block (struct dwarf2_cu *);
1803 static struct die_info *dwarf_alloc_die (struct dwarf2_cu *, int);
1805 static void dwarf_decode_macros (struct dwarf2_cu *, unsigned int, int);
1807 static int attr_form_is_block (const struct attribute *);
1809 static int attr_form_is_section_offset (const struct attribute *);
1811 static int attr_form_is_constant (const struct attribute *);
1813 static int attr_form_is_ref (const struct attribute *);
1815 static void fill_in_loclist_baton (struct dwarf2_cu *cu,
1816 struct dwarf2_loclist_baton *baton,
1817 const struct attribute *attr);
1819 static void dwarf2_symbol_mark_computed (const struct attribute *attr,
1821 struct dwarf2_cu *cu,
1824 static const gdb_byte *skip_one_die (const struct die_reader_specs *reader,
1825 const gdb_byte *info_ptr,
1826 struct abbrev_info *abbrev);
1828 static hashval_t partial_die_hash (const void *item);
1830 static int partial_die_eq (const void *item_lhs, const void *item_rhs);
1832 static struct dwarf2_per_cu_data *dwarf2_find_containing_comp_unit
1833 (sect_offset sect_off, unsigned int offset_in_dwz,
1834 struct dwarf2_per_objfile *dwarf2_per_objfile);
1836 static void prepare_one_comp_unit (struct dwarf2_cu *cu,
1837 struct die_info *comp_unit_die,
1838 enum language pretend_language);
1840 static void age_cached_comp_units (struct dwarf2_per_objfile *dwarf2_per_objfile);
1842 static void free_one_cached_comp_unit (struct dwarf2_per_cu_data *);
1844 static struct type *set_die_type (struct die_info *, struct type *,
1845 struct dwarf2_cu *);
1847 static void create_all_comp_units (struct dwarf2_per_objfile *dwarf2_per_objfile);
1849 static int create_all_type_units (struct dwarf2_per_objfile *dwarf2_per_objfile);
1851 static void load_full_comp_unit (struct dwarf2_per_cu_data *, bool,
1854 static void process_full_comp_unit (struct dwarf2_per_cu_data *,
1857 static void process_full_type_unit (struct dwarf2_per_cu_data *,
1860 static void dwarf2_add_dependence (struct dwarf2_cu *,
1861 struct dwarf2_per_cu_data *);
1863 static void dwarf2_mark (struct dwarf2_cu *);
1865 static void dwarf2_clear_marks (struct dwarf2_per_cu_data *);
1867 static struct type *get_die_type_at_offset (sect_offset,
1868 struct dwarf2_per_cu_data *);
1870 static struct type *get_die_type (struct die_info *die, struct dwarf2_cu *cu);
1872 static void queue_comp_unit (struct dwarf2_per_cu_data *per_cu,
1873 enum language pretend_language);
1875 static void process_queue (struct dwarf2_per_objfile *dwarf2_per_objfile);
1877 /* Class, the destructor of which frees all allocated queue entries. This
1878 will only have work to do if an error was thrown while processing the
1879 dwarf. If no error was thrown then the queue entries should have all
1880 been processed, and freed, as we went along. */
1882 class dwarf2_queue_guard
1885 dwarf2_queue_guard () = default;
1887 /* Free any entries remaining on the queue. There should only be
1888 entries left if we hit an error while processing the dwarf. */
1889 ~dwarf2_queue_guard ()
1891 struct dwarf2_queue_item *item, *last;
1893 item = dwarf2_queue;
1896 /* Anything still marked queued is likely to be in an
1897 inconsistent state, so discard it. */
1898 if (item->per_cu->queued)
1900 if (item->per_cu->cu != NULL)
1901 free_one_cached_comp_unit (item->per_cu);
1902 item->per_cu->queued = 0;
1910 dwarf2_queue = dwarf2_queue_tail = NULL;
1914 /* The return type of find_file_and_directory. Note, the enclosed
1915 string pointers are only valid while this object is valid. */
1917 struct file_and_directory
1919 /* The filename. This is never NULL. */
1922 /* The compilation directory. NULL if not known. If we needed to
1923 compute a new string, this points to COMP_DIR_STORAGE, otherwise,
1924 points directly to the DW_AT_comp_dir string attribute owned by
1925 the obstack that owns the DIE. */
1926 const char *comp_dir;
1928 /* If we needed to build a new string for comp_dir, this is what
1929 owns the storage. */
1930 std::string comp_dir_storage;
1933 static file_and_directory find_file_and_directory (struct die_info *die,
1934 struct dwarf2_cu *cu);
1936 static char *file_full_name (int file, struct line_header *lh,
1937 const char *comp_dir);
1939 /* Expected enum dwarf_unit_type for read_comp_unit_head. */
1940 enum class rcuh_kind { COMPILE, TYPE };
1942 static const gdb_byte *read_and_check_comp_unit_head
1943 (struct dwarf2_per_objfile* dwarf2_per_objfile,
1944 struct comp_unit_head *header,
1945 struct dwarf2_section_info *section,
1946 struct dwarf2_section_info *abbrev_section, const gdb_byte *info_ptr,
1947 rcuh_kind section_kind);
1949 static void init_cutu_and_read_dies
1950 (struct dwarf2_per_cu_data *this_cu, struct abbrev_table *abbrev_table,
1951 int use_existing_cu, int keep, bool skip_partial,
1952 die_reader_func_ftype *die_reader_func, void *data);
1954 static void init_cutu_and_read_dies_simple
1955 (struct dwarf2_per_cu_data *this_cu,
1956 die_reader_func_ftype *die_reader_func, void *data);
1958 static htab_t allocate_signatured_type_table (struct objfile *objfile);
1960 static htab_t allocate_dwo_unit_table (struct objfile *objfile);
1962 static struct dwo_unit *lookup_dwo_unit_in_dwp
1963 (struct dwarf2_per_objfile *dwarf2_per_objfile,
1964 struct dwp_file *dwp_file, const char *comp_dir,
1965 ULONGEST signature, int is_debug_types);
1967 static struct dwp_file *get_dwp_file
1968 (struct dwarf2_per_objfile *dwarf2_per_objfile);
1970 static struct dwo_unit *lookup_dwo_comp_unit
1971 (struct dwarf2_per_cu_data *, const char *, const char *, ULONGEST);
1973 static struct dwo_unit *lookup_dwo_type_unit
1974 (struct signatured_type *, const char *, const char *);
1976 static void queue_and_load_all_dwo_tus (struct dwarf2_per_cu_data *);
1978 static void free_dwo_file (struct dwo_file *);
1980 /* A unique_ptr helper to free a dwo_file. */
1982 struct dwo_file_deleter
1984 void operator() (struct dwo_file *df) const
1990 /* A unique pointer to a dwo_file. */
1992 typedef std::unique_ptr<struct dwo_file, dwo_file_deleter> dwo_file_up;
1994 static void process_cu_includes (struct dwarf2_per_objfile *dwarf2_per_objfile);
1996 static void check_producer (struct dwarf2_cu *cu);
1998 static void free_line_header_voidp (void *arg);
2000 /* Various complaints about symbol reading that don't abort the process. */
2003 dwarf2_statement_list_fits_in_line_number_section_complaint (void)
2005 complaint (_("statement list doesn't fit in .debug_line section"));
2009 dwarf2_debug_line_missing_file_complaint (void)
2011 complaint (_(".debug_line section has line data without a file"));
2015 dwarf2_debug_line_missing_end_sequence_complaint (void)
2017 complaint (_(".debug_line section has line "
2018 "program sequence without an end"));
2022 dwarf2_complex_location_expr_complaint (void)
2024 complaint (_("location expression too complex"));
2028 dwarf2_const_value_length_mismatch_complaint (const char *arg1, int arg2,
2031 complaint (_("const value length mismatch for '%s', got %d, expected %d"),
2036 dwarf2_section_buffer_overflow_complaint (struct dwarf2_section_info *section)
2038 complaint (_("debug info runs off end of %s section"
2040 get_section_name (section),
2041 get_section_file_name (section));
2045 dwarf2_macro_malformed_definition_complaint (const char *arg1)
2047 complaint (_("macro debug info contains a "
2048 "malformed macro definition:\n`%s'"),
2053 dwarf2_invalid_attrib_class_complaint (const char *arg1, const char *arg2)
2055 complaint (_("invalid attribute class or form for '%s' in '%s'"),
2059 /* Hash function for line_header_hash. */
2062 line_header_hash (const struct line_header *ofs)
2064 return to_underlying (ofs->sect_off) ^ ofs->offset_in_dwz;
2067 /* Hash function for htab_create_alloc_ex for line_header_hash. */
2070 line_header_hash_voidp (const void *item)
2072 const struct line_header *ofs = (const struct line_header *) item;
2074 return line_header_hash (ofs);
2077 /* Equality function for line_header_hash. */
2080 line_header_eq_voidp (const void *item_lhs, const void *item_rhs)
2082 const struct line_header *ofs_lhs = (const struct line_header *) item_lhs;
2083 const struct line_header *ofs_rhs = (const struct line_header *) item_rhs;
2085 return (ofs_lhs->sect_off == ofs_rhs->sect_off
2086 && ofs_lhs->offset_in_dwz == ofs_rhs->offset_in_dwz);
2091 /* Read the given attribute value as an address, taking the attribute's
2092 form into account. */
2095 attr_value_as_address (struct attribute *attr)
2099 if (attr->form != DW_FORM_addr && attr->form != DW_FORM_GNU_addr_index)
2101 /* Aside from a few clearly defined exceptions, attributes that
2102 contain an address must always be in DW_FORM_addr form.
2103 Unfortunately, some compilers happen to be violating this
2104 requirement by encoding addresses using other forms, such
2105 as DW_FORM_data4 for example. For those broken compilers,
2106 we try to do our best, without any guarantee of success,
2107 to interpret the address correctly. It would also be nice
2108 to generate a complaint, but that would require us to maintain
2109 a list of legitimate cases where a non-address form is allowed,
2110 as well as update callers to pass in at least the CU's DWARF
2111 version. This is more overhead than what we're willing to
2112 expand for a pretty rare case. */
2113 addr = DW_UNSND (attr);
2116 addr = DW_ADDR (attr);
2121 /* See declaration. */
2123 dwarf2_per_objfile::dwarf2_per_objfile (struct objfile *objfile_,
2124 const dwarf2_debug_sections *names)
2125 : objfile (objfile_)
2128 names = &dwarf2_elf_names;
2130 bfd *obfd = objfile->obfd;
2132 for (asection *sec = obfd->sections; sec != NULL; sec = sec->next)
2133 locate_sections (obfd, sec, *names);
2136 static void free_dwo_files (htab_t dwo_files, struct objfile *objfile);
2138 dwarf2_per_objfile::~dwarf2_per_objfile ()
2140 /* Cached DIE trees use xmalloc and the comp_unit_obstack. */
2141 free_cached_comp_units ();
2143 if (quick_file_names_table)
2144 htab_delete (quick_file_names_table);
2146 if (line_header_hash)
2147 htab_delete (line_header_hash);
2149 for (dwarf2_per_cu_data *per_cu : all_comp_units)
2150 VEC_free (dwarf2_per_cu_ptr, per_cu->imported_symtabs);
2152 for (signatured_type *sig_type : all_type_units)
2153 VEC_free (dwarf2_per_cu_ptr, sig_type->per_cu.imported_symtabs);
2155 VEC_free (dwarf2_section_info_def, types);
2157 if (dwo_files != NULL)
2158 free_dwo_files (dwo_files, objfile);
2160 /* Everything else should be on the objfile obstack. */
2163 /* See declaration. */
2166 dwarf2_per_objfile::free_cached_comp_units ()
2168 dwarf2_per_cu_data *per_cu = read_in_chain;
2169 dwarf2_per_cu_data **last_chain = &read_in_chain;
2170 while (per_cu != NULL)
2172 dwarf2_per_cu_data *next_cu = per_cu->cu->read_in_chain;
2175 *last_chain = next_cu;
2180 /* A helper class that calls free_cached_comp_units on
2183 class free_cached_comp_units
2187 explicit free_cached_comp_units (dwarf2_per_objfile *per_objfile)
2188 : m_per_objfile (per_objfile)
2192 ~free_cached_comp_units ()
2194 m_per_objfile->free_cached_comp_units ();
2197 DISABLE_COPY_AND_ASSIGN (free_cached_comp_units);
2201 dwarf2_per_objfile *m_per_objfile;
2204 /* Try to locate the sections we need for DWARF 2 debugging
2205 information and return true if we have enough to do something.
2206 NAMES points to the dwarf2 section names, or is NULL if the standard
2207 ELF names are used. */
2210 dwarf2_has_info (struct objfile *objfile,
2211 const struct dwarf2_debug_sections *names)
2213 if (objfile->flags & OBJF_READNEVER)
2216 struct dwarf2_per_objfile *dwarf2_per_objfile
2217 = get_dwarf2_per_objfile (objfile);
2219 if (dwarf2_per_objfile == NULL)
2221 /* Initialize per-objfile state. */
2223 = new (&objfile->objfile_obstack) struct dwarf2_per_objfile (objfile,
2225 set_dwarf2_per_objfile (objfile, dwarf2_per_objfile);
2227 return (!dwarf2_per_objfile->info.is_virtual
2228 && dwarf2_per_objfile->info.s.section != NULL
2229 && !dwarf2_per_objfile->abbrev.is_virtual
2230 && dwarf2_per_objfile->abbrev.s.section != NULL);
2233 /* Return the containing section of virtual section SECTION. */
2235 static struct dwarf2_section_info *
2236 get_containing_section (const struct dwarf2_section_info *section)
2238 gdb_assert (section->is_virtual);
2239 return section->s.containing_section;
2242 /* Return the bfd owner of SECTION. */
2245 get_section_bfd_owner (const struct dwarf2_section_info *section)
2247 if (section->is_virtual)
2249 section = get_containing_section (section);
2250 gdb_assert (!section->is_virtual);
2252 return section->s.section->owner;
2255 /* Return the bfd section of SECTION.
2256 Returns NULL if the section is not present. */
2259 get_section_bfd_section (const struct dwarf2_section_info *section)
2261 if (section->is_virtual)
2263 section = get_containing_section (section);
2264 gdb_assert (!section->is_virtual);
2266 return section->s.section;
2269 /* Return the name of SECTION. */
2272 get_section_name (const struct dwarf2_section_info *section)
2274 asection *sectp = get_section_bfd_section (section);
2276 gdb_assert (sectp != NULL);
2277 return bfd_section_name (get_section_bfd_owner (section), sectp);
2280 /* Return the name of the file SECTION is in. */
2283 get_section_file_name (const struct dwarf2_section_info *section)
2285 bfd *abfd = get_section_bfd_owner (section);
2287 return bfd_get_filename (abfd);
2290 /* Return the id of SECTION.
2291 Returns 0 if SECTION doesn't exist. */
2294 get_section_id (const struct dwarf2_section_info *section)
2296 asection *sectp = get_section_bfd_section (section);
2303 /* Return the flags of SECTION.
2304 SECTION (or containing section if this is a virtual section) must exist. */
2307 get_section_flags (const struct dwarf2_section_info *section)
2309 asection *sectp = get_section_bfd_section (section);
2311 gdb_assert (sectp != NULL);
2312 return bfd_get_section_flags (sectp->owner, sectp);
2315 /* When loading sections, we look either for uncompressed section or for
2316 compressed section names. */
2319 section_is_p (const char *section_name,
2320 const struct dwarf2_section_names *names)
2322 if (names->normal != NULL
2323 && strcmp (section_name, names->normal) == 0)
2325 if (names->compressed != NULL
2326 && strcmp (section_name, names->compressed) == 0)
2331 /* See declaration. */
2334 dwarf2_per_objfile::locate_sections (bfd *abfd, asection *sectp,
2335 const dwarf2_debug_sections &names)
2337 flagword aflag = bfd_get_section_flags (abfd, sectp);
2339 if ((aflag & SEC_HAS_CONTENTS) == 0)
2342 else if (section_is_p (sectp->name, &names.info))
2344 this->info.s.section = sectp;
2345 this->info.size = bfd_get_section_size (sectp);
2347 else if (section_is_p (sectp->name, &names.abbrev))
2349 this->abbrev.s.section = sectp;
2350 this->abbrev.size = bfd_get_section_size (sectp);
2352 else if (section_is_p (sectp->name, &names.line))
2354 this->line.s.section = sectp;
2355 this->line.size = bfd_get_section_size (sectp);
2357 else if (section_is_p (sectp->name, &names.loc))
2359 this->loc.s.section = sectp;
2360 this->loc.size = bfd_get_section_size (sectp);
2362 else if (section_is_p (sectp->name, &names.loclists))
2364 this->loclists.s.section = sectp;
2365 this->loclists.size = bfd_get_section_size (sectp);
2367 else if (section_is_p (sectp->name, &names.macinfo))
2369 this->macinfo.s.section = sectp;
2370 this->macinfo.size = bfd_get_section_size (sectp);
2372 else if (section_is_p (sectp->name, &names.macro))
2374 this->macro.s.section = sectp;
2375 this->macro.size = bfd_get_section_size (sectp);
2377 else if (section_is_p (sectp->name, &names.str))
2379 this->str.s.section = sectp;
2380 this->str.size = bfd_get_section_size (sectp);
2382 else if (section_is_p (sectp->name, &names.line_str))
2384 this->line_str.s.section = sectp;
2385 this->line_str.size = bfd_get_section_size (sectp);
2387 else if (section_is_p (sectp->name, &names.addr))
2389 this->addr.s.section = sectp;
2390 this->addr.size = bfd_get_section_size (sectp);
2392 else if (section_is_p (sectp->name, &names.frame))
2394 this->frame.s.section = sectp;
2395 this->frame.size = bfd_get_section_size (sectp);
2397 else if (section_is_p (sectp->name, &names.eh_frame))
2399 this->eh_frame.s.section = sectp;
2400 this->eh_frame.size = bfd_get_section_size (sectp);
2402 else if (section_is_p (sectp->name, &names.ranges))
2404 this->ranges.s.section = sectp;
2405 this->ranges.size = bfd_get_section_size (sectp);
2407 else if (section_is_p (sectp->name, &names.rnglists))
2409 this->rnglists.s.section = sectp;
2410 this->rnglists.size = bfd_get_section_size (sectp);
2412 else if (section_is_p (sectp->name, &names.types))
2414 struct dwarf2_section_info type_section;
2416 memset (&type_section, 0, sizeof (type_section));
2417 type_section.s.section = sectp;
2418 type_section.size = bfd_get_section_size (sectp);
2420 VEC_safe_push (dwarf2_section_info_def, this->types,
2423 else if (section_is_p (sectp->name, &names.gdb_index))
2425 this->gdb_index.s.section = sectp;
2426 this->gdb_index.size = bfd_get_section_size (sectp);
2428 else if (section_is_p (sectp->name, &names.debug_names))
2430 this->debug_names.s.section = sectp;
2431 this->debug_names.size = bfd_get_section_size (sectp);
2433 else if (section_is_p (sectp->name, &names.debug_aranges))
2435 this->debug_aranges.s.section = sectp;
2436 this->debug_aranges.size = bfd_get_section_size (sectp);
2439 if ((bfd_get_section_flags (abfd, sectp) & (SEC_LOAD | SEC_ALLOC))
2440 && bfd_section_vma (abfd, sectp) == 0)
2441 this->has_section_at_zero = true;
2444 /* A helper function that decides whether a section is empty,
2448 dwarf2_section_empty_p (const struct dwarf2_section_info *section)
2450 if (section->is_virtual)
2451 return section->size == 0;
2452 return section->s.section == NULL || section->size == 0;
2455 /* See dwarf2read.h. */
2458 dwarf2_read_section (struct objfile *objfile, dwarf2_section_info *info)
2462 gdb_byte *buf, *retbuf;
2466 info->buffer = NULL;
2469 if (dwarf2_section_empty_p (info))
2472 sectp = get_section_bfd_section (info);
2474 /* If this is a virtual section we need to read in the real one first. */
2475 if (info->is_virtual)
2477 struct dwarf2_section_info *containing_section =
2478 get_containing_section (info);
2480 gdb_assert (sectp != NULL);
2481 if ((sectp->flags & SEC_RELOC) != 0)
2483 error (_("Dwarf Error: DWP format V2 with relocations is not"
2484 " supported in section %s [in module %s]"),
2485 get_section_name (info), get_section_file_name (info));
2487 dwarf2_read_section (objfile, containing_section);
2488 /* Other code should have already caught virtual sections that don't
2490 gdb_assert (info->virtual_offset + info->size
2491 <= containing_section->size);
2492 /* If the real section is empty or there was a problem reading the
2493 section we shouldn't get here. */
2494 gdb_assert (containing_section->buffer != NULL);
2495 info->buffer = containing_section->buffer + info->virtual_offset;
2499 /* If the section has relocations, we must read it ourselves.
2500 Otherwise we attach it to the BFD. */
2501 if ((sectp->flags & SEC_RELOC) == 0)
2503 info->buffer = gdb_bfd_map_section (sectp, &info->size);
2507 buf = (gdb_byte *) obstack_alloc (&objfile->objfile_obstack, info->size);
2510 /* When debugging .o files, we may need to apply relocations; see
2511 http://sourceware.org/ml/gdb-patches/2002-04/msg00136.html .
2512 We never compress sections in .o files, so we only need to
2513 try this when the section is not compressed. */
2514 retbuf = symfile_relocate_debug_section (objfile, sectp, buf);
2517 info->buffer = retbuf;
2521 abfd = get_section_bfd_owner (info);
2522 gdb_assert (abfd != NULL);
2524 if (bfd_seek (abfd, sectp->filepos, SEEK_SET) != 0
2525 || bfd_bread (buf, info->size, abfd) != info->size)
2527 error (_("Dwarf Error: Can't read DWARF data"
2528 " in section %s [in module %s]"),
2529 bfd_section_name (abfd, sectp), bfd_get_filename (abfd));
2533 /* A helper function that returns the size of a section in a safe way.
2534 If you are positive that the section has been read before using the
2535 size, then it is safe to refer to the dwarf2_section_info object's
2536 "size" field directly. In other cases, you must call this
2537 function, because for compressed sections the size field is not set
2538 correctly until the section has been read. */
2540 static bfd_size_type
2541 dwarf2_section_size (struct objfile *objfile,
2542 struct dwarf2_section_info *info)
2545 dwarf2_read_section (objfile, info);
2549 /* Fill in SECTP, BUFP and SIZEP with section info, given OBJFILE and
2553 dwarf2_get_section_info (struct objfile *objfile,
2554 enum dwarf2_section_enum sect,
2555 asection **sectp, const gdb_byte **bufp,
2556 bfd_size_type *sizep)
2558 struct dwarf2_per_objfile *data
2559 = (struct dwarf2_per_objfile *) objfile_data (objfile,
2560 dwarf2_objfile_data_key);
2561 struct dwarf2_section_info *info;
2563 /* We may see an objfile without any DWARF, in which case we just
2574 case DWARF2_DEBUG_FRAME:
2575 info = &data->frame;
2577 case DWARF2_EH_FRAME:
2578 info = &data->eh_frame;
2581 gdb_assert_not_reached ("unexpected section");
2584 dwarf2_read_section (objfile, info);
2586 *sectp = get_section_bfd_section (info);
2587 *bufp = info->buffer;
2588 *sizep = info->size;
2591 /* A helper function to find the sections for a .dwz file. */
2594 locate_dwz_sections (bfd *abfd, asection *sectp, void *arg)
2596 struct dwz_file *dwz_file = (struct dwz_file *) arg;
2598 /* Note that we only support the standard ELF names, because .dwz
2599 is ELF-only (at the time of writing). */
2600 if (section_is_p (sectp->name, &dwarf2_elf_names.abbrev))
2602 dwz_file->abbrev.s.section = sectp;
2603 dwz_file->abbrev.size = bfd_get_section_size (sectp);
2605 else if (section_is_p (sectp->name, &dwarf2_elf_names.info))
2607 dwz_file->info.s.section = sectp;
2608 dwz_file->info.size = bfd_get_section_size (sectp);
2610 else if (section_is_p (sectp->name, &dwarf2_elf_names.str))
2612 dwz_file->str.s.section = sectp;
2613 dwz_file->str.size = bfd_get_section_size (sectp);
2615 else if (section_is_p (sectp->name, &dwarf2_elf_names.line))
2617 dwz_file->line.s.section = sectp;
2618 dwz_file->line.size = bfd_get_section_size (sectp);
2620 else if (section_is_p (sectp->name, &dwarf2_elf_names.macro))
2622 dwz_file->macro.s.section = sectp;
2623 dwz_file->macro.size = bfd_get_section_size (sectp);
2625 else if (section_is_p (sectp->name, &dwarf2_elf_names.gdb_index))
2627 dwz_file->gdb_index.s.section = sectp;
2628 dwz_file->gdb_index.size = bfd_get_section_size (sectp);
2630 else if (section_is_p (sectp->name, &dwarf2_elf_names.debug_names))
2632 dwz_file->debug_names.s.section = sectp;
2633 dwz_file->debug_names.size = bfd_get_section_size (sectp);
2637 /* Open the separate '.dwz' debug file, if needed. Return NULL if
2638 there is no .gnu_debugaltlink section in the file. Error if there
2639 is such a section but the file cannot be found. */
2641 static struct dwz_file *
2642 dwarf2_get_dwz_file (struct dwarf2_per_objfile *dwarf2_per_objfile)
2644 const char *filename;
2645 bfd_size_type buildid_len_arg;
2649 if (dwarf2_per_objfile->dwz_file != NULL)
2650 return dwarf2_per_objfile->dwz_file.get ();
2652 bfd_set_error (bfd_error_no_error);
2653 gdb::unique_xmalloc_ptr<char> data
2654 (bfd_get_alt_debug_link_info (dwarf2_per_objfile->objfile->obfd,
2655 &buildid_len_arg, &buildid));
2658 if (bfd_get_error () == bfd_error_no_error)
2660 error (_("could not read '.gnu_debugaltlink' section: %s"),
2661 bfd_errmsg (bfd_get_error ()));
2664 gdb::unique_xmalloc_ptr<bfd_byte> buildid_holder (buildid);
2666 buildid_len = (size_t) buildid_len_arg;
2668 filename = data.get ();
2670 std::string abs_storage;
2671 if (!IS_ABSOLUTE_PATH (filename))
2673 gdb::unique_xmalloc_ptr<char> abs
2674 = gdb_realpath (objfile_name (dwarf2_per_objfile->objfile));
2676 abs_storage = ldirname (abs.get ()) + SLASH_STRING + filename;
2677 filename = abs_storage.c_str ();
2680 /* First try the file name given in the section. If that doesn't
2681 work, try to use the build-id instead. */
2682 gdb_bfd_ref_ptr dwz_bfd (gdb_bfd_open (filename, gnutarget, -1));
2683 if (dwz_bfd != NULL)
2685 if (!build_id_verify (dwz_bfd.get (), buildid_len, buildid))
2689 if (dwz_bfd == NULL)
2690 dwz_bfd = build_id_to_debug_bfd (buildid_len, buildid);
2692 if (dwz_bfd == NULL)
2693 error (_("could not find '.gnu_debugaltlink' file for %s"),
2694 objfile_name (dwarf2_per_objfile->objfile));
2696 std::unique_ptr<struct dwz_file> result
2697 (new struct dwz_file (std::move (dwz_bfd)));
2699 bfd_map_over_sections (result->dwz_bfd.get (), locate_dwz_sections,
2702 gdb_bfd_record_inclusion (dwarf2_per_objfile->objfile->obfd,
2703 result->dwz_bfd.get ());
2704 dwarf2_per_objfile->dwz_file = std::move (result);
2705 return dwarf2_per_objfile->dwz_file.get ();
2708 /* DWARF quick_symbols_functions support. */
2710 /* TUs can share .debug_line entries, and there can be a lot more TUs than
2711 unique line tables, so we maintain a separate table of all .debug_line
2712 derived entries to support the sharing.
2713 All the quick functions need is the list of file names. We discard the
2714 line_header when we're done and don't need to record it here. */
2715 struct quick_file_names
2717 /* The data used to construct the hash key. */
2718 struct stmt_list_hash hash;
2720 /* The number of entries in file_names, real_names. */
2721 unsigned int num_file_names;
2723 /* The file names from the line table, after being run through
2725 const char **file_names;
2727 /* The file names from the line table after being run through
2728 gdb_realpath. These are computed lazily. */
2729 const char **real_names;
2732 /* When using the index (and thus not using psymtabs), each CU has an
2733 object of this type. This is used to hold information needed by
2734 the various "quick" methods. */
2735 struct dwarf2_per_cu_quick_data
2737 /* The file table. This can be NULL if there was no file table
2738 or it's currently not read in.
2739 NOTE: This points into dwarf2_per_objfile->quick_file_names_table. */
2740 struct quick_file_names *file_names;
2742 /* The corresponding symbol table. This is NULL if symbols for this
2743 CU have not yet been read. */
2744 struct compunit_symtab *compunit_symtab;
2746 /* A temporary mark bit used when iterating over all CUs in
2747 expand_symtabs_matching. */
2748 unsigned int mark : 1;
2750 /* True if we've tried to read the file table and found there isn't one.
2751 There will be no point in trying to read it again next time. */
2752 unsigned int no_file_data : 1;
2755 /* Utility hash function for a stmt_list_hash. */
2758 hash_stmt_list_entry (const struct stmt_list_hash *stmt_list_hash)
2762 if (stmt_list_hash->dwo_unit != NULL)
2763 v += (uintptr_t) stmt_list_hash->dwo_unit->dwo_file;
2764 v += to_underlying (stmt_list_hash->line_sect_off);
2768 /* Utility equality function for a stmt_list_hash. */
2771 eq_stmt_list_entry (const struct stmt_list_hash *lhs,
2772 const struct stmt_list_hash *rhs)
2774 if ((lhs->dwo_unit != NULL) != (rhs->dwo_unit != NULL))
2776 if (lhs->dwo_unit != NULL
2777 && lhs->dwo_unit->dwo_file != rhs->dwo_unit->dwo_file)
2780 return lhs->line_sect_off == rhs->line_sect_off;
2783 /* Hash function for a quick_file_names. */
2786 hash_file_name_entry (const void *e)
2788 const struct quick_file_names *file_data
2789 = (const struct quick_file_names *) e;
2791 return hash_stmt_list_entry (&file_data->hash);
2794 /* Equality function for a quick_file_names. */
2797 eq_file_name_entry (const void *a, const void *b)
2799 const struct quick_file_names *ea = (const struct quick_file_names *) a;
2800 const struct quick_file_names *eb = (const struct quick_file_names *) b;
2802 return eq_stmt_list_entry (&ea->hash, &eb->hash);
2805 /* Delete function for a quick_file_names. */
2808 delete_file_name_entry (void *e)
2810 struct quick_file_names *file_data = (struct quick_file_names *) e;
2813 for (i = 0; i < file_data->num_file_names; ++i)
2815 xfree ((void*) file_data->file_names[i]);
2816 if (file_data->real_names)
2817 xfree ((void*) file_data->real_names[i]);
2820 /* The space for the struct itself lives on objfile_obstack,
2821 so we don't free it here. */
2824 /* Create a quick_file_names hash table. */
2827 create_quick_file_names_table (unsigned int nr_initial_entries)
2829 return htab_create_alloc (nr_initial_entries,
2830 hash_file_name_entry, eq_file_name_entry,
2831 delete_file_name_entry, xcalloc, xfree);
2834 /* Read in PER_CU->CU. This function is unrelated to symtabs, symtab would
2835 have to be created afterwards. You should call age_cached_comp_units after
2836 processing PER_CU->CU. dw2_setup must have been already called. */
2839 load_cu (struct dwarf2_per_cu_data *per_cu, bool skip_partial)
2841 if (per_cu->is_debug_types)
2842 load_full_type_unit (per_cu);
2844 load_full_comp_unit (per_cu, skip_partial, language_minimal);
2846 if (per_cu->cu == NULL)
2847 return; /* Dummy CU. */
2849 dwarf2_find_base_address (per_cu->cu->dies, per_cu->cu);
2852 /* Read in the symbols for PER_CU. */
2855 dw2_do_instantiate_symtab (struct dwarf2_per_cu_data *per_cu, bool skip_partial)
2857 struct dwarf2_per_objfile *dwarf2_per_objfile = per_cu->dwarf2_per_objfile;
2859 /* Skip type_unit_groups, reading the type units they contain
2860 is handled elsewhere. */
2861 if (IS_TYPE_UNIT_GROUP (per_cu))
2864 /* The destructor of dwarf2_queue_guard frees any entries left on
2865 the queue. After this point we're guaranteed to leave this function
2866 with the dwarf queue empty. */
2867 dwarf2_queue_guard q_guard;
2869 if (dwarf2_per_objfile->using_index
2870 ? per_cu->v.quick->compunit_symtab == NULL
2871 : (per_cu->v.psymtab == NULL || !per_cu->v.psymtab->readin))
2873 queue_comp_unit (per_cu, language_minimal);
2874 load_cu (per_cu, skip_partial);
2876 /* If we just loaded a CU from a DWO, and we're working with an index
2877 that may badly handle TUs, load all the TUs in that DWO as well.
2878 http://sourceware.org/bugzilla/show_bug.cgi?id=15021 */
2879 if (!per_cu->is_debug_types
2880 && per_cu->cu != NULL
2881 && per_cu->cu->dwo_unit != NULL
2882 && dwarf2_per_objfile->index_table != NULL
2883 && dwarf2_per_objfile->index_table->version <= 7
2884 /* DWP files aren't supported yet. */
2885 && get_dwp_file (dwarf2_per_objfile) == NULL)
2886 queue_and_load_all_dwo_tus (per_cu);
2889 process_queue (dwarf2_per_objfile);
2891 /* Age the cache, releasing compilation units that have not
2892 been used recently. */
2893 age_cached_comp_units (dwarf2_per_objfile);
2896 /* Ensure that the symbols for PER_CU have been read in. OBJFILE is
2897 the objfile from which this CU came. Returns the resulting symbol
2900 static struct compunit_symtab *
2901 dw2_instantiate_symtab (struct dwarf2_per_cu_data *per_cu, bool skip_partial)
2903 struct dwarf2_per_objfile *dwarf2_per_objfile = per_cu->dwarf2_per_objfile;
2905 gdb_assert (dwarf2_per_objfile->using_index);
2906 if (!per_cu->v.quick->compunit_symtab)
2908 free_cached_comp_units freer (dwarf2_per_objfile);
2909 scoped_restore decrementer = increment_reading_symtab ();
2910 dw2_do_instantiate_symtab (per_cu, skip_partial);
2911 process_cu_includes (dwarf2_per_objfile);
2914 return per_cu->v.quick->compunit_symtab;
2917 /* See declaration. */
2919 dwarf2_per_cu_data *
2920 dwarf2_per_objfile::get_cutu (int index)
2922 if (index >= this->all_comp_units.size ())
2924 index -= this->all_comp_units.size ();
2925 gdb_assert (index < this->all_type_units.size ());
2926 return &this->all_type_units[index]->per_cu;
2929 return this->all_comp_units[index];
2932 /* See declaration. */
2934 dwarf2_per_cu_data *
2935 dwarf2_per_objfile::get_cu (int index)
2937 gdb_assert (index >= 0 && index < this->all_comp_units.size ());
2939 return this->all_comp_units[index];
2942 /* See declaration. */
2945 dwarf2_per_objfile::get_tu (int index)
2947 gdb_assert (index >= 0 && index < this->all_type_units.size ());
2949 return this->all_type_units[index];
2952 /* Return a new dwarf2_per_cu_data allocated on OBJFILE's
2953 objfile_obstack, and constructed with the specified field
2956 static dwarf2_per_cu_data *
2957 create_cu_from_index_list (struct dwarf2_per_objfile *dwarf2_per_objfile,
2958 struct dwarf2_section_info *section,
2960 sect_offset sect_off, ULONGEST length)
2962 struct objfile *objfile = dwarf2_per_objfile->objfile;
2963 dwarf2_per_cu_data *the_cu
2964 = OBSTACK_ZALLOC (&objfile->objfile_obstack,
2965 struct dwarf2_per_cu_data);
2966 the_cu->sect_off = sect_off;
2967 the_cu->length = length;
2968 the_cu->dwarf2_per_objfile = dwarf2_per_objfile;
2969 the_cu->section = section;
2970 the_cu->v.quick = OBSTACK_ZALLOC (&objfile->objfile_obstack,
2971 struct dwarf2_per_cu_quick_data);
2972 the_cu->is_dwz = is_dwz;
2976 /* A helper for create_cus_from_index that handles a given list of
2980 create_cus_from_index_list (struct dwarf2_per_objfile *dwarf2_per_objfile,
2981 const gdb_byte *cu_list, offset_type n_elements,
2982 struct dwarf2_section_info *section,
2985 for (offset_type i = 0; i < n_elements; i += 2)
2987 gdb_static_assert (sizeof (ULONGEST) >= 8);
2989 sect_offset sect_off
2990 = (sect_offset) extract_unsigned_integer (cu_list, 8, BFD_ENDIAN_LITTLE);
2991 ULONGEST length = extract_unsigned_integer (cu_list + 8, 8, BFD_ENDIAN_LITTLE);
2994 dwarf2_per_cu_data *per_cu
2995 = create_cu_from_index_list (dwarf2_per_objfile, section, is_dwz,
2997 dwarf2_per_objfile->all_comp_units.push_back (per_cu);
3001 /* Read the CU list from the mapped index, and use it to create all
3002 the CU objects for this objfile. */
3005 create_cus_from_index (struct dwarf2_per_objfile *dwarf2_per_objfile,
3006 const gdb_byte *cu_list, offset_type cu_list_elements,
3007 const gdb_byte *dwz_list, offset_type dwz_elements)
3009 gdb_assert (dwarf2_per_objfile->all_comp_units.empty ());
3010 dwarf2_per_objfile->all_comp_units.reserve
3011 ((cu_list_elements + dwz_elements) / 2);
3013 create_cus_from_index_list (dwarf2_per_objfile, cu_list, cu_list_elements,
3014 &dwarf2_per_objfile->info, 0);
3016 if (dwz_elements == 0)
3019 dwz_file *dwz = dwarf2_get_dwz_file (dwarf2_per_objfile);
3020 create_cus_from_index_list (dwarf2_per_objfile, dwz_list, dwz_elements,
3024 /* Create the signatured type hash table from the index. */
3027 create_signatured_type_table_from_index
3028 (struct dwarf2_per_objfile *dwarf2_per_objfile,
3029 struct dwarf2_section_info *section,
3030 const gdb_byte *bytes,
3031 offset_type elements)
3033 struct objfile *objfile = dwarf2_per_objfile->objfile;
3035 gdb_assert (dwarf2_per_objfile->all_type_units.empty ());
3036 dwarf2_per_objfile->all_type_units.reserve (elements / 3);
3038 htab_t sig_types_hash = allocate_signatured_type_table (objfile);
3040 for (offset_type i = 0; i < elements; i += 3)
3042 struct signatured_type *sig_type;
3045 cu_offset type_offset_in_tu;
3047 gdb_static_assert (sizeof (ULONGEST) >= 8);
3048 sect_offset sect_off
3049 = (sect_offset) extract_unsigned_integer (bytes, 8, BFD_ENDIAN_LITTLE);
3051 = (cu_offset) extract_unsigned_integer (bytes + 8, 8,
3053 signature = extract_unsigned_integer (bytes + 16, 8, BFD_ENDIAN_LITTLE);
3056 sig_type = OBSTACK_ZALLOC (&objfile->objfile_obstack,
3057 struct signatured_type);
3058 sig_type->signature = signature;
3059 sig_type->type_offset_in_tu = type_offset_in_tu;
3060 sig_type->per_cu.is_debug_types = 1;
3061 sig_type->per_cu.section = section;
3062 sig_type->per_cu.sect_off = sect_off;
3063 sig_type->per_cu.dwarf2_per_objfile = dwarf2_per_objfile;
3064 sig_type->per_cu.v.quick
3065 = OBSTACK_ZALLOC (&objfile->objfile_obstack,
3066 struct dwarf2_per_cu_quick_data);
3068 slot = htab_find_slot (sig_types_hash, sig_type, INSERT);
3071 dwarf2_per_objfile->all_type_units.push_back (sig_type);
3074 dwarf2_per_objfile->signatured_types = sig_types_hash;
3077 /* Create the signatured type hash table from .debug_names. */
3080 create_signatured_type_table_from_debug_names
3081 (struct dwarf2_per_objfile *dwarf2_per_objfile,
3082 const mapped_debug_names &map,
3083 struct dwarf2_section_info *section,
3084 struct dwarf2_section_info *abbrev_section)
3086 struct objfile *objfile = dwarf2_per_objfile->objfile;
3088 dwarf2_read_section (objfile, section);
3089 dwarf2_read_section (objfile, abbrev_section);
3091 gdb_assert (dwarf2_per_objfile->all_type_units.empty ());
3092 dwarf2_per_objfile->all_type_units.reserve (map.tu_count);
3094 htab_t sig_types_hash = allocate_signatured_type_table (objfile);
3096 for (uint32_t i = 0; i < map.tu_count; ++i)
3098 struct signatured_type *sig_type;
3101 sect_offset sect_off
3102 = (sect_offset) (extract_unsigned_integer
3103 (map.tu_table_reordered + i * map.offset_size,
3105 map.dwarf5_byte_order));
3107 comp_unit_head cu_header;
3108 read_and_check_comp_unit_head (dwarf2_per_objfile, &cu_header, section,
3110 section->buffer + to_underlying (sect_off),
3113 sig_type = OBSTACK_ZALLOC (&objfile->objfile_obstack,
3114 struct signatured_type);
3115 sig_type->signature = cu_header.signature;
3116 sig_type->type_offset_in_tu = cu_header.type_cu_offset_in_tu;
3117 sig_type->per_cu.is_debug_types = 1;
3118 sig_type->per_cu.section = section;
3119 sig_type->per_cu.sect_off = sect_off;
3120 sig_type->per_cu.dwarf2_per_objfile = dwarf2_per_objfile;
3121 sig_type->per_cu.v.quick
3122 = OBSTACK_ZALLOC (&objfile->objfile_obstack,
3123 struct dwarf2_per_cu_quick_data);
3125 slot = htab_find_slot (sig_types_hash, sig_type, INSERT);
3128 dwarf2_per_objfile->all_type_units.push_back (sig_type);
3131 dwarf2_per_objfile->signatured_types = sig_types_hash;
3134 /* Read the address map data from the mapped index, and use it to
3135 populate the objfile's psymtabs_addrmap. */
3138 create_addrmap_from_index (struct dwarf2_per_objfile *dwarf2_per_objfile,
3139 struct mapped_index *index)
3141 struct objfile *objfile = dwarf2_per_objfile->objfile;
3142 struct gdbarch *gdbarch = get_objfile_arch (objfile);
3143 const gdb_byte *iter, *end;
3144 struct addrmap *mutable_map;
3147 auto_obstack temp_obstack;
3149 mutable_map = addrmap_create_mutable (&temp_obstack);
3151 iter = index->address_table.data ();
3152 end = iter + index->address_table.size ();
3154 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
3158 ULONGEST hi, lo, cu_index;
3159 lo = extract_unsigned_integer (iter, 8, BFD_ENDIAN_LITTLE);
3161 hi = extract_unsigned_integer (iter, 8, BFD_ENDIAN_LITTLE);
3163 cu_index = extract_unsigned_integer (iter, 4, BFD_ENDIAN_LITTLE);
3168 complaint (_(".gdb_index address table has invalid range (%s - %s)"),
3169 hex_string (lo), hex_string (hi));
3173 if (cu_index >= dwarf2_per_objfile->all_comp_units.size ())
3175 complaint (_(".gdb_index address table has invalid CU number %u"),
3176 (unsigned) cu_index);
3180 lo = gdbarch_adjust_dwarf2_addr (gdbarch, lo + baseaddr);
3181 hi = gdbarch_adjust_dwarf2_addr (gdbarch, hi + baseaddr);
3182 addrmap_set_empty (mutable_map, lo, hi - 1,
3183 dwarf2_per_objfile->get_cu (cu_index));
3186 objfile->psymtabs_addrmap = addrmap_create_fixed (mutable_map,
3187 &objfile->objfile_obstack);
3190 /* Read the address map data from DWARF-5 .debug_aranges, and use it to
3191 populate the objfile's psymtabs_addrmap. */
3194 create_addrmap_from_aranges (struct dwarf2_per_objfile *dwarf2_per_objfile,
3195 struct dwarf2_section_info *section)
3197 struct objfile *objfile = dwarf2_per_objfile->objfile;
3198 bfd *abfd = objfile->obfd;
3199 struct gdbarch *gdbarch = get_objfile_arch (objfile);
3200 const CORE_ADDR baseaddr = ANOFFSET (objfile->section_offsets,
3201 SECT_OFF_TEXT (objfile));
3203 auto_obstack temp_obstack;
3204 addrmap *mutable_map = addrmap_create_mutable (&temp_obstack);
3206 std::unordered_map<sect_offset,
3207 dwarf2_per_cu_data *,
3208 gdb::hash_enum<sect_offset>>
3209 debug_info_offset_to_per_cu;
3210 for (dwarf2_per_cu_data *per_cu : dwarf2_per_objfile->all_comp_units)
3212 const auto insertpair
3213 = debug_info_offset_to_per_cu.emplace (per_cu->sect_off, per_cu);
3214 if (!insertpair.second)
3216 warning (_("Section .debug_aranges in %s has duplicate "
3217 "debug_info_offset %s, ignoring .debug_aranges."),
3218 objfile_name (objfile), sect_offset_str (per_cu->sect_off));
3223 dwarf2_read_section (objfile, section);
3225 const bfd_endian dwarf5_byte_order = gdbarch_byte_order (gdbarch);
3227 const gdb_byte *addr = section->buffer;
3229 while (addr < section->buffer + section->size)
3231 const gdb_byte *const entry_addr = addr;
3232 unsigned int bytes_read;
3234 const LONGEST entry_length = read_initial_length (abfd, addr,
3238 const gdb_byte *const entry_end = addr + entry_length;
3239 const bool dwarf5_is_dwarf64 = bytes_read != 4;
3240 const uint8_t offset_size = dwarf5_is_dwarf64 ? 8 : 4;
3241 if (addr + entry_length > section->buffer + section->size)
3243 warning (_("Section .debug_aranges in %s entry at offset %zu "
3244 "length %s exceeds section length %s, "
3245 "ignoring .debug_aranges."),
3246 objfile_name (objfile), entry_addr - section->buffer,
3247 plongest (bytes_read + entry_length),
3248 pulongest (section->size));
3252 /* The version number. */
3253 const uint16_t version = read_2_bytes (abfd, addr);
3257 warning (_("Section .debug_aranges in %s entry at offset %zu "
3258 "has unsupported version %d, ignoring .debug_aranges."),
3259 objfile_name (objfile), entry_addr - section->buffer,
3264 const uint64_t debug_info_offset
3265 = extract_unsigned_integer (addr, offset_size, dwarf5_byte_order);
3266 addr += offset_size;
3267 const auto per_cu_it
3268 = debug_info_offset_to_per_cu.find (sect_offset (debug_info_offset));
3269 if (per_cu_it == debug_info_offset_to_per_cu.cend ())
3271 warning (_("Section .debug_aranges in %s entry at offset %zu "
3272 "debug_info_offset %s does not exists, "
3273 "ignoring .debug_aranges."),
3274 objfile_name (objfile), entry_addr - section->buffer,
3275 pulongest (debug_info_offset));
3278 dwarf2_per_cu_data *const per_cu = per_cu_it->second;
3280 const uint8_t address_size = *addr++;
3281 if (address_size < 1 || address_size > 8)
3283 warning (_("Section .debug_aranges in %s entry at offset %zu "
3284 "address_size %u is invalid, ignoring .debug_aranges."),
3285 objfile_name (objfile), entry_addr - section->buffer,
3290 const uint8_t segment_selector_size = *addr++;
3291 if (segment_selector_size != 0)
3293 warning (_("Section .debug_aranges in %s entry at offset %zu "
3294 "segment_selector_size %u is not supported, "
3295 "ignoring .debug_aranges."),
3296 objfile_name (objfile), entry_addr - section->buffer,
3297 segment_selector_size);
3301 /* Must pad to an alignment boundary that is twice the address
3302 size. It is undocumented by the DWARF standard but GCC does
3304 for (size_t padding = ((-(addr - section->buffer))
3305 & (2 * address_size - 1));
3306 padding > 0; padding--)
3309 warning (_("Section .debug_aranges in %s entry at offset %zu "
3310 "padding is not zero, ignoring .debug_aranges."),
3311 objfile_name (objfile), entry_addr - section->buffer);
3317 if (addr + 2 * address_size > entry_end)
3319 warning (_("Section .debug_aranges in %s entry at offset %zu "
3320 "address list is not properly terminated, "
3321 "ignoring .debug_aranges."),
3322 objfile_name (objfile), entry_addr - section->buffer);
3325 ULONGEST start = extract_unsigned_integer (addr, address_size,
3327 addr += address_size;
3328 ULONGEST length = extract_unsigned_integer (addr, address_size,
3330 addr += address_size;
3331 if (start == 0 && length == 0)
3333 if (start == 0 && !dwarf2_per_objfile->has_section_at_zero)
3335 /* Symbol was eliminated due to a COMDAT group. */
3338 ULONGEST end = start + length;
3339 start = gdbarch_adjust_dwarf2_addr (gdbarch, start + baseaddr);
3340 end = gdbarch_adjust_dwarf2_addr (gdbarch, end + baseaddr);
3341 addrmap_set_empty (mutable_map, start, end - 1, per_cu);
3345 objfile->psymtabs_addrmap = addrmap_create_fixed (mutable_map,
3346 &objfile->objfile_obstack);
3349 /* Find a slot in the mapped index INDEX for the object named NAME.
3350 If NAME is found, set *VEC_OUT to point to the CU vector in the
3351 constant pool and return true. If NAME cannot be found, return
3355 find_slot_in_mapped_hash (struct mapped_index *index, const char *name,
3356 offset_type **vec_out)
3359 offset_type slot, step;
3360 int (*cmp) (const char *, const char *);
3362 gdb::unique_xmalloc_ptr<char> without_params;
3363 if (current_language->la_language == language_cplus
3364 || current_language->la_language == language_fortran
3365 || current_language->la_language == language_d)
3367 /* NAME is already canonical. Drop any qualifiers as .gdb_index does
3370 if (strchr (name, '(') != NULL)
3372 without_params = cp_remove_params (name);
3374 if (without_params != NULL)
3375 name = without_params.get ();
3379 /* Index version 4 did not support case insensitive searches. But the
3380 indices for case insensitive languages are built in lowercase, therefore
3381 simulate our NAME being searched is also lowercased. */
3382 hash = mapped_index_string_hash ((index->version == 4
3383 && case_sensitivity == case_sensitive_off
3384 ? 5 : index->version),
3387 slot = hash & (index->symbol_table.size () - 1);
3388 step = ((hash * 17) & (index->symbol_table.size () - 1)) | 1;
3389 cmp = (case_sensitivity == case_sensitive_on ? strcmp : strcasecmp);
3395 const auto &bucket = index->symbol_table[slot];
3396 if (bucket.name == 0 && bucket.vec == 0)
3399 str = index->constant_pool + MAYBE_SWAP (bucket.name);
3400 if (!cmp (name, str))
3402 *vec_out = (offset_type *) (index->constant_pool
3403 + MAYBE_SWAP (bucket.vec));
3407 slot = (slot + step) & (index->symbol_table.size () - 1);
3411 /* A helper function that reads the .gdb_index from SECTION and fills
3412 in MAP. FILENAME is the name of the file containing the section;
3413 it is used for error reporting. DEPRECATED_OK is true if it is
3414 ok to use deprecated sections.
3416 CU_LIST, CU_LIST_ELEMENTS, TYPES_LIST, and TYPES_LIST_ELEMENTS are
3417 out parameters that are filled in with information about the CU and
3418 TU lists in the section.
3420 Returns 1 if all went well, 0 otherwise. */
3423 read_gdb_index_from_section (struct objfile *objfile,
3424 const char *filename,
3426 struct dwarf2_section_info *section,
3427 struct mapped_index *map,
3428 const gdb_byte **cu_list,
3429 offset_type *cu_list_elements,
3430 const gdb_byte **types_list,
3431 offset_type *types_list_elements)
3433 const gdb_byte *addr;
3434 offset_type version;
3435 offset_type *metadata;
3438 if (dwarf2_section_empty_p (section))
3441 /* Older elfutils strip versions could keep the section in the main
3442 executable while splitting it for the separate debug info file. */
3443 if ((get_section_flags (section) & SEC_HAS_CONTENTS) == 0)
3446 dwarf2_read_section (objfile, section);
3448 addr = section->buffer;
3449 /* Version check. */
3450 version = MAYBE_SWAP (*(offset_type *) addr);
3451 /* Versions earlier than 3 emitted every copy of a psymbol. This
3452 causes the index to behave very poorly for certain requests. Version 3
3453 contained incomplete addrmap. So, it seems better to just ignore such
3457 static int warning_printed = 0;
3458 if (!warning_printed)
3460 warning (_("Skipping obsolete .gdb_index section in %s."),
3462 warning_printed = 1;
3466 /* Index version 4 uses a different hash function than index version
3469 Versions earlier than 6 did not emit psymbols for inlined
3470 functions. Using these files will cause GDB not to be able to
3471 set breakpoints on inlined functions by name, so we ignore these
3472 indices unless the user has done
3473 "set use-deprecated-index-sections on". */
3474 if (version < 6 && !deprecated_ok)
3476 static int warning_printed = 0;
3477 if (!warning_printed)
3480 Skipping deprecated .gdb_index section in %s.\n\
3481 Do \"set use-deprecated-index-sections on\" before the file is read\n\
3482 to use the section anyway."),
3484 warning_printed = 1;
3488 /* Version 7 indices generated by gold refer to the CU for a symbol instead
3489 of the TU (for symbols coming from TUs),
3490 http://sourceware.org/bugzilla/show_bug.cgi?id=15021.
3491 Plus gold-generated indices can have duplicate entries for global symbols,
3492 http://sourceware.org/bugzilla/show_bug.cgi?id=15646.
3493 These are just performance bugs, and we can't distinguish gdb-generated
3494 indices from gold-generated ones, so issue no warning here. */
3496 /* Indexes with higher version than the one supported by GDB may be no
3497 longer backward compatible. */
3501 map->version = version;
3503 metadata = (offset_type *) (addr + sizeof (offset_type));
3506 *cu_list = addr + MAYBE_SWAP (metadata[i]);
3507 *cu_list_elements = ((MAYBE_SWAP (metadata[i + 1]) - MAYBE_SWAP (metadata[i]))
3511 *types_list = addr + MAYBE_SWAP (metadata[i]);
3512 *types_list_elements = ((MAYBE_SWAP (metadata[i + 1])
3513 - MAYBE_SWAP (metadata[i]))
3517 const gdb_byte *address_table = addr + MAYBE_SWAP (metadata[i]);
3518 const gdb_byte *address_table_end = addr + MAYBE_SWAP (metadata[i + 1]);
3520 = gdb::array_view<const gdb_byte> (address_table, address_table_end);
3523 const gdb_byte *symbol_table = addr + MAYBE_SWAP (metadata[i]);
3524 const gdb_byte *symbol_table_end = addr + MAYBE_SWAP (metadata[i + 1]);
3526 = gdb::array_view<mapped_index::symbol_table_slot>
3527 ((mapped_index::symbol_table_slot *) symbol_table,
3528 (mapped_index::symbol_table_slot *) symbol_table_end);
3531 map->constant_pool = (char *) (addr + MAYBE_SWAP (metadata[i]));
3536 /* Read .gdb_index. If everything went ok, initialize the "quick"
3537 elements of all the CUs and return 1. Otherwise, return 0. */
3540 dwarf2_read_gdb_index (struct dwarf2_per_objfile *dwarf2_per_objfile)
3542 const gdb_byte *cu_list, *types_list, *dwz_list = NULL;
3543 offset_type cu_list_elements, types_list_elements, dwz_list_elements = 0;
3544 struct dwz_file *dwz;
3545 struct objfile *objfile = dwarf2_per_objfile->objfile;
3547 std::unique_ptr<struct mapped_index> map (new struct mapped_index);
3548 if (!read_gdb_index_from_section (objfile, objfile_name (objfile),
3549 use_deprecated_index_sections,
3550 &dwarf2_per_objfile->gdb_index, map.get (),
3551 &cu_list, &cu_list_elements,
3552 &types_list, &types_list_elements))
3555 /* Don't use the index if it's empty. */
3556 if (map->symbol_table.empty ())
3559 /* If there is a .dwz file, read it so we can get its CU list as
3561 dwz = dwarf2_get_dwz_file (dwarf2_per_objfile);
3564 struct mapped_index dwz_map;
3565 const gdb_byte *dwz_types_ignore;
3566 offset_type dwz_types_elements_ignore;
3568 if (!read_gdb_index_from_section (objfile,
3569 bfd_get_filename (dwz->dwz_bfd), 1,
3570 &dwz->gdb_index, &dwz_map,
3571 &dwz_list, &dwz_list_elements,
3573 &dwz_types_elements_ignore))
3575 warning (_("could not read '.gdb_index' section from %s; skipping"),
3576 bfd_get_filename (dwz->dwz_bfd));
3581 create_cus_from_index (dwarf2_per_objfile, cu_list, cu_list_elements,
3582 dwz_list, dwz_list_elements);
3584 if (types_list_elements)
3586 struct dwarf2_section_info *section;
3588 /* We can only handle a single .debug_types when we have an
3590 if (VEC_length (dwarf2_section_info_def, dwarf2_per_objfile->types) != 1)
3593 section = VEC_index (dwarf2_section_info_def,
3594 dwarf2_per_objfile->types, 0);
3596 create_signatured_type_table_from_index (dwarf2_per_objfile, section,
3597 types_list, types_list_elements);
3600 create_addrmap_from_index (dwarf2_per_objfile, map.get ());
3602 dwarf2_per_objfile->index_table = std::move (map);
3603 dwarf2_per_objfile->using_index = 1;
3604 dwarf2_per_objfile->quick_file_names_table =
3605 create_quick_file_names_table (dwarf2_per_objfile->all_comp_units.size ());
3610 /* die_reader_func for dw2_get_file_names. */
3613 dw2_get_file_names_reader (const struct die_reader_specs *reader,
3614 const gdb_byte *info_ptr,
3615 struct die_info *comp_unit_die,
3619 struct dwarf2_cu *cu = reader->cu;
3620 struct dwarf2_per_cu_data *this_cu = cu->per_cu;
3621 struct dwarf2_per_objfile *dwarf2_per_objfile
3622 = cu->per_cu->dwarf2_per_objfile;
3623 struct objfile *objfile = dwarf2_per_objfile->objfile;
3624 struct dwarf2_per_cu_data *lh_cu;
3625 struct attribute *attr;
3628 struct quick_file_names *qfn;
3630 gdb_assert (! this_cu->is_debug_types);
3632 /* Our callers never want to match partial units -- instead they
3633 will match the enclosing full CU. */
3634 if (comp_unit_die->tag == DW_TAG_partial_unit)
3636 this_cu->v.quick->no_file_data = 1;
3644 sect_offset line_offset {};
3646 attr = dwarf2_attr (comp_unit_die, DW_AT_stmt_list, cu);
3649 struct quick_file_names find_entry;
3651 line_offset = (sect_offset) DW_UNSND (attr);
3653 /* We may have already read in this line header (TU line header sharing).
3654 If we have we're done. */
3655 find_entry.hash.dwo_unit = cu->dwo_unit;
3656 find_entry.hash.line_sect_off = line_offset;
3657 slot = htab_find_slot (dwarf2_per_objfile->quick_file_names_table,
3658 &find_entry, INSERT);
3661 lh_cu->v.quick->file_names = (struct quick_file_names *) *slot;
3665 lh = dwarf_decode_line_header (line_offset, cu);
3669 lh_cu->v.quick->no_file_data = 1;
3673 qfn = XOBNEW (&objfile->objfile_obstack, struct quick_file_names);
3674 qfn->hash.dwo_unit = cu->dwo_unit;
3675 qfn->hash.line_sect_off = line_offset;
3676 gdb_assert (slot != NULL);
3679 file_and_directory fnd = find_file_and_directory (comp_unit_die, cu);
3681 qfn->num_file_names = lh->file_names.size ();
3683 XOBNEWVEC (&objfile->objfile_obstack, const char *, lh->file_names.size ());
3684 for (i = 0; i < lh->file_names.size (); ++i)
3685 qfn->file_names[i] = file_full_name (i + 1, lh.get (), fnd.comp_dir);
3686 qfn->real_names = NULL;
3688 lh_cu->v.quick->file_names = qfn;
3691 /* A helper for the "quick" functions which attempts to read the line
3692 table for THIS_CU. */
3694 static struct quick_file_names *
3695 dw2_get_file_names (struct dwarf2_per_cu_data *this_cu)
3697 /* This should never be called for TUs. */
3698 gdb_assert (! this_cu->is_debug_types);
3699 /* Nor type unit groups. */
3700 gdb_assert (! IS_TYPE_UNIT_GROUP (this_cu));
3702 if (this_cu->v.quick->file_names != NULL)
3703 return this_cu->v.quick->file_names;
3704 /* If we know there is no line data, no point in looking again. */
3705 if (this_cu->v.quick->no_file_data)
3708 init_cutu_and_read_dies_simple (this_cu, dw2_get_file_names_reader, NULL);
3710 if (this_cu->v.quick->no_file_data)
3712 return this_cu->v.quick->file_names;
3715 /* A helper for the "quick" functions which computes and caches the
3716 real path for a given file name from the line table. */
3719 dw2_get_real_path (struct objfile *objfile,
3720 struct quick_file_names *qfn, int index)
3722 if (qfn->real_names == NULL)
3723 qfn->real_names = OBSTACK_CALLOC (&objfile->objfile_obstack,
3724 qfn->num_file_names, const char *);
3726 if (qfn->real_names[index] == NULL)
3727 qfn->real_names[index] = gdb_realpath (qfn->file_names[index]).release ();
3729 return qfn->real_names[index];
3732 static struct symtab *
3733 dw2_find_last_source_symtab (struct objfile *objfile)
3735 struct dwarf2_per_objfile *dwarf2_per_objfile
3736 = get_dwarf2_per_objfile (objfile);
3737 dwarf2_per_cu_data *dwarf_cu = dwarf2_per_objfile->all_comp_units.back ();
3738 compunit_symtab *cust = dw2_instantiate_symtab (dwarf_cu, false);
3743 return compunit_primary_filetab (cust);
3746 /* Traversal function for dw2_forget_cached_source_info. */
3749 dw2_free_cached_file_names (void **slot, void *info)
3751 struct quick_file_names *file_data = (struct quick_file_names *) *slot;
3753 if (file_data->real_names)
3757 for (i = 0; i < file_data->num_file_names; ++i)
3759 xfree ((void*) file_data->real_names[i]);
3760 file_data->real_names[i] = NULL;
3768 dw2_forget_cached_source_info (struct objfile *objfile)
3770 struct dwarf2_per_objfile *dwarf2_per_objfile
3771 = get_dwarf2_per_objfile (objfile);
3773 htab_traverse_noresize (dwarf2_per_objfile->quick_file_names_table,
3774 dw2_free_cached_file_names, NULL);
3777 /* Helper function for dw2_map_symtabs_matching_filename that expands
3778 the symtabs and calls the iterator. */
3781 dw2_map_expand_apply (struct objfile *objfile,
3782 struct dwarf2_per_cu_data *per_cu,
3783 const char *name, const char *real_path,
3784 gdb::function_view<bool (symtab *)> callback)
3786 struct compunit_symtab *last_made = objfile->compunit_symtabs;
3788 /* Don't visit already-expanded CUs. */
3789 if (per_cu->v.quick->compunit_symtab)
3792 /* This may expand more than one symtab, and we want to iterate over
3794 dw2_instantiate_symtab (per_cu, false);
3796 return iterate_over_some_symtabs (name, real_path, objfile->compunit_symtabs,
3797 last_made, callback);
3800 /* Implementation of the map_symtabs_matching_filename method. */
3803 dw2_map_symtabs_matching_filename
3804 (struct objfile *objfile, const char *name, const char *real_path,
3805 gdb::function_view<bool (symtab *)> callback)
3807 const char *name_basename = lbasename (name);
3808 struct dwarf2_per_objfile *dwarf2_per_objfile
3809 = get_dwarf2_per_objfile (objfile);
3811 /* The rule is CUs specify all the files, including those used by
3812 any TU, so there's no need to scan TUs here. */
3814 for (dwarf2_per_cu_data *per_cu : dwarf2_per_objfile->all_comp_units)
3816 /* We only need to look at symtabs not already expanded. */
3817 if (per_cu->v.quick->compunit_symtab)
3820 quick_file_names *file_data = dw2_get_file_names (per_cu);
3821 if (file_data == NULL)
3824 for (int j = 0; j < file_data->num_file_names; ++j)
3826 const char *this_name = file_data->file_names[j];
3827 const char *this_real_name;
3829 if (compare_filenames_for_search (this_name, name))
3831 if (dw2_map_expand_apply (objfile, per_cu, name, real_path,
3837 /* Before we invoke realpath, which can get expensive when many
3838 files are involved, do a quick comparison of the basenames. */
3839 if (! basenames_may_differ
3840 && FILENAME_CMP (lbasename (this_name), name_basename) != 0)
3843 this_real_name = dw2_get_real_path (objfile, file_data, j);
3844 if (compare_filenames_for_search (this_real_name, name))
3846 if (dw2_map_expand_apply (objfile, per_cu, name, real_path,
3852 if (real_path != NULL)
3854 gdb_assert (IS_ABSOLUTE_PATH (real_path));
3855 gdb_assert (IS_ABSOLUTE_PATH (name));
3856 if (this_real_name != NULL
3857 && FILENAME_CMP (real_path, this_real_name) == 0)
3859 if (dw2_map_expand_apply (objfile, per_cu, name, real_path,
3871 /* Struct used to manage iterating over all CUs looking for a symbol. */
3873 struct dw2_symtab_iterator
3875 /* The dwarf2_per_objfile owning the CUs we are iterating on. */
3876 struct dwarf2_per_objfile *dwarf2_per_objfile;
3877 /* If non-zero, only look for symbols that match BLOCK_INDEX. */
3878 int want_specific_block;
3879 /* One of GLOBAL_BLOCK or STATIC_BLOCK.
3880 Unused if !WANT_SPECIFIC_BLOCK. */
3882 /* The kind of symbol we're looking for. */
3884 /* The list of CUs from the index entry of the symbol,
3885 or NULL if not found. */
3887 /* The next element in VEC to look at. */
3889 /* The number of elements in VEC, or zero if there is no match. */
3891 /* Have we seen a global version of the symbol?
3892 If so we can ignore all further global instances.
3893 This is to work around gold/15646, inefficient gold-generated
3898 /* Initialize the index symtab iterator ITER.
3899 If WANT_SPECIFIC_BLOCK is non-zero, only look for symbols
3900 in block BLOCK_INDEX. Otherwise BLOCK_INDEX is ignored. */
3903 dw2_symtab_iter_init (struct dw2_symtab_iterator *iter,
3904 struct dwarf2_per_objfile *dwarf2_per_objfile,
3905 int want_specific_block,
3910 iter->dwarf2_per_objfile = dwarf2_per_objfile;
3911 iter->want_specific_block = want_specific_block;
3912 iter->block_index = block_index;
3913 iter->domain = domain;
3915 iter->global_seen = 0;
3917 mapped_index *index = dwarf2_per_objfile->index_table.get ();
3919 /* index is NULL if OBJF_READNOW. */
3920 if (index != NULL && find_slot_in_mapped_hash (index, name, &iter->vec))
3921 iter->length = MAYBE_SWAP (*iter->vec);
3929 /* Return the next matching CU or NULL if there are no more. */
3931 static struct dwarf2_per_cu_data *
3932 dw2_symtab_iter_next (struct dw2_symtab_iterator *iter)
3934 struct dwarf2_per_objfile *dwarf2_per_objfile = iter->dwarf2_per_objfile;
3936 for ( ; iter->next < iter->length; ++iter->next)
3938 offset_type cu_index_and_attrs =
3939 MAYBE_SWAP (iter->vec[iter->next + 1]);
3940 offset_type cu_index = GDB_INDEX_CU_VALUE (cu_index_and_attrs);
3941 int want_static = iter->block_index != GLOBAL_BLOCK;
3942 /* This value is only valid for index versions >= 7. */
3943 int is_static = GDB_INDEX_SYMBOL_STATIC_VALUE (cu_index_and_attrs);
3944 gdb_index_symbol_kind symbol_kind =
3945 GDB_INDEX_SYMBOL_KIND_VALUE (cu_index_and_attrs);
3946 /* Only check the symbol attributes if they're present.
3947 Indices prior to version 7 don't record them,
3948 and indices >= 7 may elide them for certain symbols
3949 (gold does this). */
3951 (dwarf2_per_objfile->index_table->version >= 7
3952 && symbol_kind != GDB_INDEX_SYMBOL_KIND_NONE);
3954 /* Don't crash on bad data. */
3955 if (cu_index >= (dwarf2_per_objfile->all_comp_units.size ()
3956 + dwarf2_per_objfile->all_type_units.size ()))
3958 complaint (_(".gdb_index entry has bad CU index"
3960 objfile_name (dwarf2_per_objfile->objfile));
3964 dwarf2_per_cu_data *per_cu = dwarf2_per_objfile->get_cutu (cu_index);
3966 /* Skip if already read in. */
3967 if (per_cu->v.quick->compunit_symtab)
3970 /* Check static vs global. */
3973 if (iter->want_specific_block
3974 && want_static != is_static)
3976 /* Work around gold/15646. */
3977 if (!is_static && iter->global_seen)
3980 iter->global_seen = 1;
3983 /* Only check the symbol's kind if it has one. */
3986 switch (iter->domain)
3989 if (symbol_kind != GDB_INDEX_SYMBOL_KIND_VARIABLE
3990 && symbol_kind != GDB_INDEX_SYMBOL_KIND_FUNCTION
3991 /* Some types are also in VAR_DOMAIN. */
3992 && symbol_kind != GDB_INDEX_SYMBOL_KIND_TYPE)
3996 if (symbol_kind != GDB_INDEX_SYMBOL_KIND_TYPE)
4000 if (symbol_kind != GDB_INDEX_SYMBOL_KIND_OTHER)
4015 static struct compunit_symtab *
4016 dw2_lookup_symbol (struct objfile *objfile, int block_index,
4017 const char *name, domain_enum domain)
4019 struct compunit_symtab *stab_best = NULL;
4020 struct dwarf2_per_objfile *dwarf2_per_objfile
4021 = get_dwarf2_per_objfile (objfile);
4023 lookup_name_info lookup_name (name, symbol_name_match_type::FULL);
4025 struct dw2_symtab_iterator iter;
4026 struct dwarf2_per_cu_data *per_cu;
4028 dw2_symtab_iter_init (&iter, dwarf2_per_objfile, 1, block_index, domain, name);
4030 while ((per_cu = dw2_symtab_iter_next (&iter)) != NULL)
4032 struct symbol *sym, *with_opaque = NULL;
4033 struct compunit_symtab *stab = dw2_instantiate_symtab (per_cu, false);
4034 const struct blockvector *bv = COMPUNIT_BLOCKVECTOR (stab);
4035 struct block *block = BLOCKVECTOR_BLOCK (bv, block_index);
4037 sym = block_find_symbol (block, name, domain,
4038 block_find_non_opaque_type_preferred,
4041 /* Some caution must be observed with overloaded functions
4042 and methods, since the index will not contain any overload
4043 information (but NAME might contain it). */
4046 && SYMBOL_MATCHES_SEARCH_NAME (sym, lookup_name))
4048 if (with_opaque != NULL
4049 && SYMBOL_MATCHES_SEARCH_NAME (with_opaque, lookup_name))
4052 /* Keep looking through other CUs. */
4059 dw2_print_stats (struct objfile *objfile)
4061 struct dwarf2_per_objfile *dwarf2_per_objfile
4062 = get_dwarf2_per_objfile (objfile);
4063 int total = (dwarf2_per_objfile->all_comp_units.size ()
4064 + dwarf2_per_objfile->all_type_units.size ());
4067 for (int i = 0; i < total; ++i)
4069 dwarf2_per_cu_data *per_cu = dwarf2_per_objfile->get_cutu (i);
4071 if (!per_cu->v.quick->compunit_symtab)
4074 printf_filtered (_(" Number of read CUs: %d\n"), total - count);
4075 printf_filtered (_(" Number of unread CUs: %d\n"), count);
4078 /* This dumps minimal information about the index.
4079 It is called via "mt print objfiles".
4080 One use is to verify .gdb_index has been loaded by the
4081 gdb.dwarf2/gdb-index.exp testcase. */
4084 dw2_dump (struct objfile *objfile)
4086 struct dwarf2_per_objfile *dwarf2_per_objfile
4087 = get_dwarf2_per_objfile (objfile);
4089 gdb_assert (dwarf2_per_objfile->using_index);
4090 printf_filtered (".gdb_index:");
4091 if (dwarf2_per_objfile->index_table != NULL)
4093 printf_filtered (" version %d\n",
4094 dwarf2_per_objfile->index_table->version);
4097 printf_filtered (" faked for \"readnow\"\n");
4098 printf_filtered ("\n");
4102 dw2_relocate (struct objfile *objfile,
4103 const struct section_offsets *new_offsets,
4104 const struct section_offsets *delta)
4106 /* There's nothing to relocate here. */
4110 dw2_expand_symtabs_for_function (struct objfile *objfile,
4111 const char *func_name)
4113 struct dwarf2_per_objfile *dwarf2_per_objfile
4114 = get_dwarf2_per_objfile (objfile);
4116 struct dw2_symtab_iterator iter;
4117 struct dwarf2_per_cu_data *per_cu;
4119 /* Note: It doesn't matter what we pass for block_index here. */
4120 dw2_symtab_iter_init (&iter, dwarf2_per_objfile, 0, GLOBAL_BLOCK, VAR_DOMAIN,
4123 while ((per_cu = dw2_symtab_iter_next (&iter)) != NULL)
4124 dw2_instantiate_symtab (per_cu, false);
4129 dw2_expand_all_symtabs (struct objfile *objfile)
4131 struct dwarf2_per_objfile *dwarf2_per_objfile
4132 = get_dwarf2_per_objfile (objfile);
4133 int total_units = (dwarf2_per_objfile->all_comp_units.size ()
4134 + dwarf2_per_objfile->all_type_units.size ());
4136 for (int i = 0; i < total_units; ++i)
4138 dwarf2_per_cu_data *per_cu = dwarf2_per_objfile->get_cutu (i);
4140 /* We don't want to directly expand a partial CU, because if we
4141 read it with the wrong language, then assertion failures can
4142 be triggered later on. See PR symtab/23010. So, tell
4143 dw2_instantiate_symtab to skip partial CUs -- any important
4144 partial CU will be read via DW_TAG_imported_unit anyway. */
4145 dw2_instantiate_symtab (per_cu, true);
4150 dw2_expand_symtabs_with_fullname (struct objfile *objfile,
4151 const char *fullname)
4153 struct dwarf2_per_objfile *dwarf2_per_objfile
4154 = get_dwarf2_per_objfile (objfile);
4156 /* We don't need to consider type units here.
4157 This is only called for examining code, e.g. expand_line_sal.
4158 There can be an order of magnitude (or more) more type units
4159 than comp units, and we avoid them if we can. */
4161 for (dwarf2_per_cu_data *per_cu : dwarf2_per_objfile->all_comp_units)
4163 /* We only need to look at symtabs not already expanded. */
4164 if (per_cu->v.quick->compunit_symtab)
4167 quick_file_names *file_data = dw2_get_file_names (per_cu);
4168 if (file_data == NULL)
4171 for (int j = 0; j < file_data->num_file_names; ++j)
4173 const char *this_fullname = file_data->file_names[j];
4175 if (filename_cmp (this_fullname, fullname) == 0)
4177 dw2_instantiate_symtab (per_cu, false);
4185 dw2_map_matching_symbols (struct objfile *objfile,
4186 const char * name, domain_enum domain,
4188 int (*callback) (struct block *,
4189 struct symbol *, void *),
4190 void *data, symbol_name_match_type match,
4191 symbol_compare_ftype *ordered_compare)
4193 /* Currently unimplemented; used for Ada. The function can be called if the
4194 current language is Ada for a non-Ada objfile using GNU index. As Ada
4195 does not look for non-Ada symbols this function should just return. */
4198 /* Symbol name matcher for .gdb_index names.
4200 Symbol names in .gdb_index have a few particularities:
4202 - There's no indication of which is the language of each symbol.
4204 Since each language has its own symbol name matching algorithm,
4205 and we don't know which language is the right one, we must match
4206 each symbol against all languages. This would be a potential
4207 performance problem if it were not mitigated by the
4208 mapped_index::name_components lookup table, which significantly
4209 reduces the number of times we need to call into this matcher,
4210 making it a non-issue.
4212 - Symbol names in the index have no overload (parameter)
4213 information. I.e., in C++, "foo(int)" and "foo(long)" both
4214 appear as "foo" in the index, for example.
4216 This means that the lookup names passed to the symbol name
4217 matcher functions must have no parameter information either
4218 because (e.g.) symbol search name "foo" does not match
4219 lookup-name "foo(int)" [while swapping search name for lookup
4222 class gdb_index_symbol_name_matcher
4225 /* Prepares the vector of comparison functions for LOOKUP_NAME. */
4226 gdb_index_symbol_name_matcher (const lookup_name_info &lookup_name);
4228 /* Walk all the matcher routines and match SYMBOL_NAME against them.
4229 Returns true if any matcher matches. */
4230 bool matches (const char *symbol_name);
4233 /* A reference to the lookup name we're matching against. */
4234 const lookup_name_info &m_lookup_name;
4236 /* A vector holding all the different symbol name matchers, for all
4238 std::vector<symbol_name_matcher_ftype *> m_symbol_name_matcher_funcs;
4241 gdb_index_symbol_name_matcher::gdb_index_symbol_name_matcher
4242 (const lookup_name_info &lookup_name)
4243 : m_lookup_name (lookup_name)
4245 /* Prepare the vector of comparison functions upfront, to avoid
4246 doing the same work for each symbol. Care is taken to avoid
4247 matching with the same matcher more than once if/when multiple
4248 languages use the same matcher function. */
4249 auto &matchers = m_symbol_name_matcher_funcs;
4250 matchers.reserve (nr_languages);
4252 matchers.push_back (default_symbol_name_matcher);
4254 for (int i = 0; i < nr_languages; i++)
4256 const language_defn *lang = language_def ((enum language) i);
4257 symbol_name_matcher_ftype *name_matcher
4258 = get_symbol_name_matcher (lang, m_lookup_name);
4260 /* Don't insert the same comparison routine more than once.
4261 Note that we do this linear walk instead of a seemingly
4262 cheaper sorted insert, or use a std::set or something like
4263 that, because relative order of function addresses is not
4264 stable. This is not a problem in practice because the number
4265 of supported languages is low, and the cost here is tiny
4266 compared to the number of searches we'll do afterwards using
4268 if (name_matcher != default_symbol_name_matcher
4269 && (std::find (matchers.begin (), matchers.end (), name_matcher)
4270 == matchers.end ()))
4271 matchers.push_back (name_matcher);
4276 gdb_index_symbol_name_matcher::matches (const char *symbol_name)
4278 for (auto matches_name : m_symbol_name_matcher_funcs)
4279 if (matches_name (symbol_name, m_lookup_name, NULL))
4285 /* Starting from a search name, return the string that finds the upper
4286 bound of all strings that start with SEARCH_NAME in a sorted name
4287 list. Returns the empty string to indicate that the upper bound is
4288 the end of the list. */
4291 make_sort_after_prefix_name (const char *search_name)
4293 /* When looking to complete "func", we find the upper bound of all
4294 symbols that start with "func" by looking for where we'd insert
4295 the closest string that would follow "func" in lexicographical
4296 order. Usually, that's "func"-with-last-character-incremented,
4297 i.e. "fund". Mind non-ASCII characters, though. Usually those
4298 will be UTF-8 multi-byte sequences, but we can't be certain.
4299 Especially mind the 0xff character, which is a valid character in
4300 non-UTF-8 source character sets (e.g. Latin1 'ÿ'), and we can't
4301 rule out compilers allowing it in identifiers. Note that
4302 conveniently, strcmp/strcasecmp are specified to compare
4303 characters interpreted as unsigned char. So what we do is treat
4304 the whole string as a base 256 number composed of a sequence of
4305 base 256 "digits" and add 1 to it. I.e., adding 1 to 0xff wraps
4306 to 0, and carries 1 to the following more-significant position.
4307 If the very first character in SEARCH_NAME ends up incremented
4308 and carries/overflows, then the upper bound is the end of the
4309 list. The string after the empty string is also the empty
4312 Some examples of this operation:
4314 SEARCH_NAME => "+1" RESULT
4318 "\xff" "a" "\xff" => "\xff" "b"
4323 Then, with these symbols for example:
4329 completing "func" looks for symbols between "func" and
4330 "func"-with-last-character-incremented, i.e. "fund" (exclusive),
4331 which finds "func" and "func1", but not "fund".
4335 funcÿ (Latin1 'ÿ' [0xff])
4339 completing "funcÿ" looks for symbols between "funcÿ" and "fund"
4340 (exclusive), which finds "funcÿ" and "funcÿ1", but not "fund".
4344 ÿÿ (Latin1 'ÿ' [0xff])
4347 completing "ÿ" or "ÿÿ" looks for symbols between between "ÿÿ" and
4348 the end of the list.
4350 std::string after = search_name;
4351 while (!after.empty () && (unsigned char) after.back () == 0xff)
4353 if (!after.empty ())
4354 after.back () = (unsigned char) after.back () + 1;
4358 /* See declaration. */
4360 std::pair<std::vector<name_component>::const_iterator,
4361 std::vector<name_component>::const_iterator>
4362 mapped_index_base::find_name_components_bounds
4363 (const lookup_name_info &lookup_name_without_params) const
4366 = this->name_components_casing == case_sensitive_on ? strcmp : strcasecmp;
4369 = lookup_name_without_params.cplus ().lookup_name ().c_str ();
4371 /* Comparison function object for lower_bound that matches against a
4372 given symbol name. */
4373 auto lookup_compare_lower = [&] (const name_component &elem,
4376 const char *elem_qualified = this->symbol_name_at (elem.idx);
4377 const char *elem_name = elem_qualified + elem.name_offset;
4378 return name_cmp (elem_name, name) < 0;
4381 /* Comparison function object for upper_bound that matches against a
4382 given symbol name. */
4383 auto lookup_compare_upper = [&] (const char *name,
4384 const name_component &elem)
4386 const char *elem_qualified = this->symbol_name_at (elem.idx);
4387 const char *elem_name = elem_qualified + elem.name_offset;
4388 return name_cmp (name, elem_name) < 0;
4391 auto begin = this->name_components.begin ();
4392 auto end = this->name_components.end ();
4394 /* Find the lower bound. */
4397 if (lookup_name_without_params.completion_mode () && cplus[0] == '\0')
4400 return std::lower_bound (begin, end, cplus, lookup_compare_lower);
4403 /* Find the upper bound. */
4406 if (lookup_name_without_params.completion_mode ())
4408 /* In completion mode, we want UPPER to point past all
4409 symbols names that have the same prefix. I.e., with
4410 these symbols, and completing "func":
4412 function << lower bound
4414 other_function << upper bound
4416 We find the upper bound by looking for the insertion
4417 point of "func"-with-last-character-incremented,
4419 std::string after = make_sort_after_prefix_name (cplus);
4422 return std::lower_bound (lower, end, after.c_str (),
4423 lookup_compare_lower);
4426 return std::upper_bound (lower, end, cplus, lookup_compare_upper);
4429 return {lower, upper};
4432 /* See declaration. */
4435 mapped_index_base::build_name_components ()
4437 if (!this->name_components.empty ())
4440 this->name_components_casing = case_sensitivity;
4442 = this->name_components_casing == case_sensitive_on ? strcmp : strcasecmp;
4444 /* The code below only knows how to break apart components of C++
4445 symbol names (and other languages that use '::' as
4446 namespace/module separator). If we add support for wild matching
4447 to some language that uses some other operator (E.g., Ada, Go and
4448 D use '.'), then we'll need to try splitting the symbol name
4449 according to that language too. Note that Ada does support wild
4450 matching, but doesn't currently support .gdb_index. */
4451 auto count = this->symbol_name_count ();
4452 for (offset_type idx = 0; idx < count; idx++)
4454 if (this->symbol_name_slot_invalid (idx))
4457 const char *name = this->symbol_name_at (idx);
4459 /* Add each name component to the name component table. */
4460 unsigned int previous_len = 0;
4461 for (unsigned int current_len = cp_find_first_component (name);
4462 name[current_len] != '\0';
4463 current_len += cp_find_first_component (name + current_len))
4465 gdb_assert (name[current_len] == ':');
4466 this->name_components.push_back ({previous_len, idx});
4467 /* Skip the '::'. */
4469 previous_len = current_len;
4471 this->name_components.push_back ({previous_len, idx});
4474 /* Sort name_components elements by name. */
4475 auto name_comp_compare = [&] (const name_component &left,
4476 const name_component &right)
4478 const char *left_qualified = this->symbol_name_at (left.idx);
4479 const char *right_qualified = this->symbol_name_at (right.idx);
4481 const char *left_name = left_qualified + left.name_offset;
4482 const char *right_name = right_qualified + right.name_offset;
4484 return name_cmp (left_name, right_name) < 0;
4487 std::sort (this->name_components.begin (),
4488 this->name_components.end (),
4492 /* Helper for dw2_expand_symtabs_matching that works with a
4493 mapped_index_base instead of the containing objfile. This is split
4494 to a separate function in order to be able to unit test the
4495 name_components matching using a mock mapped_index_base. For each
4496 symbol name that matches, calls MATCH_CALLBACK, passing it the
4497 symbol's index in the mapped_index_base symbol table. */
4500 dw2_expand_symtabs_matching_symbol
4501 (mapped_index_base &index,
4502 const lookup_name_info &lookup_name_in,
4503 gdb::function_view<expand_symtabs_symbol_matcher_ftype> symbol_matcher,
4504 enum search_domain kind,
4505 gdb::function_view<void (offset_type)> match_callback)
4507 lookup_name_info lookup_name_without_params
4508 = lookup_name_in.make_ignore_params ();
4509 gdb_index_symbol_name_matcher lookup_name_matcher
4510 (lookup_name_without_params);
4512 /* Build the symbol name component sorted vector, if we haven't
4514 index.build_name_components ();
4516 auto bounds = index.find_name_components_bounds (lookup_name_without_params);
4518 /* Now for each symbol name in range, check to see if we have a name
4519 match, and if so, call the MATCH_CALLBACK callback. */
4521 /* The same symbol may appear more than once in the range though.
4522 E.g., if we're looking for symbols that complete "w", and we have
4523 a symbol named "w1::w2", we'll find the two name components for
4524 that same symbol in the range. To be sure we only call the
4525 callback once per symbol, we first collect the symbol name
4526 indexes that matched in a temporary vector and ignore
4528 std::vector<offset_type> matches;
4529 matches.reserve (std::distance (bounds.first, bounds.second));
4531 for (; bounds.first != bounds.second; ++bounds.first)
4533 const char *qualified = index.symbol_name_at (bounds.first->idx);
4535 if (!lookup_name_matcher.matches (qualified)
4536 || (symbol_matcher != NULL && !symbol_matcher (qualified)))
4539 matches.push_back (bounds.first->idx);
4542 std::sort (matches.begin (), matches.end ());
4544 /* Finally call the callback, once per match. */
4546 for (offset_type idx : matches)
4550 match_callback (idx);
4555 /* Above we use a type wider than idx's for 'prev', since 0 and
4556 (offset_type)-1 are both possible values. */
4557 static_assert (sizeof (prev) > sizeof (offset_type), "");
4562 namespace selftests { namespace dw2_expand_symtabs_matching {
4564 /* A mock .gdb_index/.debug_names-like name index table, enough to
4565 exercise dw2_expand_symtabs_matching_symbol, which works with the
4566 mapped_index_base interface. Builds an index from the symbol list
4567 passed as parameter to the constructor. */
4568 class mock_mapped_index : public mapped_index_base
4571 mock_mapped_index (gdb::array_view<const char *> symbols)
4572 : m_symbol_table (symbols)
4575 DISABLE_COPY_AND_ASSIGN (mock_mapped_index);
4577 /* Return the number of names in the symbol table. */
4578 size_t symbol_name_count () const override
4580 return m_symbol_table.size ();
4583 /* Get the name of the symbol at IDX in the symbol table. */
4584 const char *symbol_name_at (offset_type idx) const override
4586 return m_symbol_table[idx];
4590 gdb::array_view<const char *> m_symbol_table;
4593 /* Convenience function that converts a NULL pointer to a "<null>"
4594 string, to pass to print routines. */
4597 string_or_null (const char *str)
4599 return str != NULL ? str : "<null>";
4602 /* Check if a lookup_name_info built from
4603 NAME/MATCH_TYPE/COMPLETION_MODE matches the symbols in the mock
4604 index. EXPECTED_LIST is the list of expected matches, in expected
4605 matching order. If no match expected, then an empty list is
4606 specified. Returns true on success. On failure prints a warning
4607 indicating the file:line that failed, and returns false. */
4610 check_match (const char *file, int line,
4611 mock_mapped_index &mock_index,
4612 const char *name, symbol_name_match_type match_type,
4613 bool completion_mode,
4614 std::initializer_list<const char *> expected_list)
4616 lookup_name_info lookup_name (name, match_type, completion_mode);
4618 bool matched = true;
4620 auto mismatch = [&] (const char *expected_str,
4623 warning (_("%s:%d: match_type=%s, looking-for=\"%s\", "
4624 "expected=\"%s\", got=\"%s\"\n"),
4626 (match_type == symbol_name_match_type::FULL
4628 name, string_or_null (expected_str), string_or_null (got));
4632 auto expected_it = expected_list.begin ();
4633 auto expected_end = expected_list.end ();
4635 dw2_expand_symtabs_matching_symbol (mock_index, lookup_name,
4637 [&] (offset_type idx)
4639 const char *matched_name = mock_index.symbol_name_at (idx);
4640 const char *expected_str
4641 = expected_it == expected_end ? NULL : *expected_it++;
4643 if (expected_str == NULL || strcmp (expected_str, matched_name) != 0)
4644 mismatch (expected_str, matched_name);
4647 const char *expected_str
4648 = expected_it == expected_end ? NULL : *expected_it++;
4649 if (expected_str != NULL)
4650 mismatch (expected_str, NULL);
4655 /* The symbols added to the mock mapped_index for testing (in
4657 static const char *test_symbols[] = {
4666 "ns2::tmpl<int>::foo2",
4667 "(anonymous namespace)::A::B::C",
4669 /* These are used to check that the increment-last-char in the
4670 matching algorithm for completion doesn't match "t1_fund" when
4671 completing "t1_func". */
4677 /* A UTF-8 name with multi-byte sequences to make sure that
4678 cp-name-parser understands this as a single identifier ("função"
4679 is "function" in PT). */
4682 /* \377 (0xff) is Latin1 'ÿ'. */
4685 /* \377 (0xff) is Latin1 'ÿ'. */
4689 /* A name with all sorts of complications. Starts with "z" to make
4690 it easier for the completion tests below. */
4691 #define Z_SYM_NAME \
4692 "z::std::tuple<(anonymous namespace)::ui*, std::bar<(anonymous namespace)::ui> >" \
4693 "::tuple<(anonymous namespace)::ui*, " \
4694 "std::default_delete<(anonymous namespace)::ui>, void>"
4699 /* Returns true if the mapped_index_base::find_name_component_bounds
4700 method finds EXPECTED_SYMS in INDEX when looking for SEARCH_NAME,
4701 in completion mode. */
4704 check_find_bounds_finds (mapped_index_base &index,
4705 const char *search_name,
4706 gdb::array_view<const char *> expected_syms)
4708 lookup_name_info lookup_name (search_name,
4709 symbol_name_match_type::FULL, true);
4711 auto bounds = index.find_name_components_bounds (lookup_name);
4713 size_t distance = std::distance (bounds.first, bounds.second);
4714 if (distance != expected_syms.size ())
4717 for (size_t exp_elem = 0; exp_elem < distance; exp_elem++)
4719 auto nc_elem = bounds.first + exp_elem;
4720 const char *qualified = index.symbol_name_at (nc_elem->idx);
4721 if (strcmp (qualified, expected_syms[exp_elem]) != 0)
4728 /* Test the lower-level mapped_index::find_name_component_bounds
4732 test_mapped_index_find_name_component_bounds ()
4734 mock_mapped_index mock_index (test_symbols);
4736 mock_index.build_name_components ();
4738 /* Test the lower-level mapped_index::find_name_component_bounds
4739 method in completion mode. */
4741 static const char *expected_syms[] = {
4746 SELF_CHECK (check_find_bounds_finds (mock_index,
4747 "t1_func", expected_syms));
4750 /* Check that the increment-last-char in the name matching algorithm
4751 for completion doesn't get confused with Ansi1 'ÿ' / 0xff. */
4753 static const char *expected_syms1[] = {
4757 SELF_CHECK (check_find_bounds_finds (mock_index,
4758 "\377", expected_syms1));
4760 static const char *expected_syms2[] = {
4763 SELF_CHECK (check_find_bounds_finds (mock_index,
4764 "\377\377", expected_syms2));
4768 /* Test dw2_expand_symtabs_matching_symbol. */
4771 test_dw2_expand_symtabs_matching_symbol ()
4773 mock_mapped_index mock_index (test_symbols);
4775 /* We let all tests run until the end even if some fails, for debug
4777 bool any_mismatch = false;
4779 /* Create the expected symbols list (an initializer_list). Needed
4780 because lists have commas, and we need to pass them to CHECK,
4781 which is a macro. */
4782 #define EXPECT(...) { __VA_ARGS__ }
4784 /* Wrapper for check_match that passes down the current
4785 __FILE__/__LINE__. */
4786 #define CHECK_MATCH(NAME, MATCH_TYPE, COMPLETION_MODE, EXPECTED_LIST) \
4787 any_mismatch |= !check_match (__FILE__, __LINE__, \
4789 NAME, MATCH_TYPE, COMPLETION_MODE, \
4792 /* Identity checks. */
4793 for (const char *sym : test_symbols)
4795 /* Should be able to match all existing symbols. */
4796 CHECK_MATCH (sym, symbol_name_match_type::FULL, false,
4799 /* Should be able to match all existing symbols with
4801 std::string with_params = std::string (sym) + "(int)";
4802 CHECK_MATCH (with_params.c_str (), symbol_name_match_type::FULL, false,
4805 /* Should be able to match all existing symbols with
4806 parameters and qualifiers. */
4807 with_params = std::string (sym) + " ( int ) const";
4808 CHECK_MATCH (with_params.c_str (), symbol_name_match_type::FULL, false,
4811 /* This should really find sym, but cp-name-parser.y doesn't
4812 know about lvalue/rvalue qualifiers yet. */
4813 with_params = std::string (sym) + " ( int ) &&";
4814 CHECK_MATCH (with_params.c_str (), symbol_name_match_type::FULL, false,
4818 /* Check that the name matching algorithm for completion doesn't get
4819 confused with Latin1 'ÿ' / 0xff. */
4821 static const char str[] = "\377";
4822 CHECK_MATCH (str, symbol_name_match_type::FULL, true,
4823 EXPECT ("\377", "\377\377123"));
4826 /* Check that the increment-last-char in the matching algorithm for
4827 completion doesn't match "t1_fund" when completing "t1_func". */
4829 static const char str[] = "t1_func";
4830 CHECK_MATCH (str, symbol_name_match_type::FULL, true,
4831 EXPECT ("t1_func", "t1_func1"));
4834 /* Check that completion mode works at each prefix of the expected
4837 static const char str[] = "function(int)";
4838 size_t len = strlen (str);
4841 for (size_t i = 1; i < len; i++)
4843 lookup.assign (str, i);
4844 CHECK_MATCH (lookup.c_str (), symbol_name_match_type::FULL, true,
4845 EXPECT ("function"));
4849 /* While "w" is a prefix of both components, the match function
4850 should still only be called once. */
4852 CHECK_MATCH ("w", symbol_name_match_type::FULL, true,
4854 CHECK_MATCH ("w", symbol_name_match_type::WILD, true,
4858 /* Same, with a "complicated" symbol. */
4860 static const char str[] = Z_SYM_NAME;
4861 size_t len = strlen (str);
4864 for (size_t i = 1; i < len; i++)
4866 lookup.assign (str, i);
4867 CHECK_MATCH (lookup.c_str (), symbol_name_match_type::FULL, true,
4868 EXPECT (Z_SYM_NAME));
4872 /* In FULL mode, an incomplete symbol doesn't match. */
4874 CHECK_MATCH ("std::zfunction(int", symbol_name_match_type::FULL, false,
4878 /* A complete symbol with parameters matches any overload, since the
4879 index has no overload info. */
4881 CHECK_MATCH ("std::zfunction(int)", symbol_name_match_type::FULL, true,
4882 EXPECT ("std::zfunction", "std::zfunction2"));
4883 CHECK_MATCH ("zfunction(int)", symbol_name_match_type::WILD, true,
4884 EXPECT ("std::zfunction", "std::zfunction2"));
4885 CHECK_MATCH ("zfunc", symbol_name_match_type::WILD, true,
4886 EXPECT ("std::zfunction", "std::zfunction2"));
4889 /* Check that whitespace is ignored appropriately. A symbol with a
4890 template argument list. */
4892 static const char expected[] = "ns::foo<int>";
4893 CHECK_MATCH ("ns :: foo < int > ", symbol_name_match_type::FULL, false,
4895 CHECK_MATCH ("foo < int > ", symbol_name_match_type::WILD, false,
4899 /* Check that whitespace is ignored appropriately. A symbol with a
4900 template argument list that includes a pointer. */
4902 static const char expected[] = "ns::foo<char*>";
4903 /* Try both completion and non-completion modes. */
4904 static const bool completion_mode[2] = {false, true};
4905 for (size_t i = 0; i < 2; i++)
4907 CHECK_MATCH ("ns :: foo < char * >", symbol_name_match_type::FULL,
4908 completion_mode[i], EXPECT (expected));
4909 CHECK_MATCH ("foo < char * >", symbol_name_match_type::WILD,
4910 completion_mode[i], EXPECT (expected));
4912 CHECK_MATCH ("ns :: foo < char * > (int)", symbol_name_match_type::FULL,
4913 completion_mode[i], EXPECT (expected));
4914 CHECK_MATCH ("foo < char * > (int)", symbol_name_match_type::WILD,
4915 completion_mode[i], EXPECT (expected));
4920 /* Check method qualifiers are ignored. */
4921 static const char expected[] = "ns::foo<char*>";
4922 CHECK_MATCH ("ns :: foo < char * > ( int ) const",
4923 symbol_name_match_type::FULL, true, EXPECT (expected));
4924 CHECK_MATCH ("ns :: foo < char * > ( int ) &&",
4925 symbol_name_match_type::FULL, true, EXPECT (expected));
4926 CHECK_MATCH ("foo < char * > ( int ) const",
4927 symbol_name_match_type::WILD, true, EXPECT (expected));
4928 CHECK_MATCH ("foo < char * > ( int ) &&",
4929 symbol_name_match_type::WILD, true, EXPECT (expected));
4932 /* Test lookup names that don't match anything. */
4934 CHECK_MATCH ("bar2", symbol_name_match_type::WILD, false,
4937 CHECK_MATCH ("doesntexist", symbol_name_match_type::FULL, false,
4941 /* Some wild matching tests, exercising "(anonymous namespace)",
4942 which should not be confused with a parameter list. */
4944 static const char *syms[] = {
4948 "A :: B :: C ( int )",
4953 for (const char *s : syms)
4955 CHECK_MATCH (s, symbol_name_match_type::WILD, false,
4956 EXPECT ("(anonymous namespace)::A::B::C"));
4961 static const char expected[] = "ns2::tmpl<int>::foo2";
4962 CHECK_MATCH ("tmp", symbol_name_match_type::WILD, true,
4964 CHECK_MATCH ("tmpl<", symbol_name_match_type::WILD, true,
4968 SELF_CHECK (!any_mismatch);
4977 test_mapped_index_find_name_component_bounds ();
4978 test_dw2_expand_symtabs_matching_symbol ();
4981 }} // namespace selftests::dw2_expand_symtabs_matching
4983 #endif /* GDB_SELF_TEST */
4985 /* If FILE_MATCHER is NULL or if PER_CU has
4986 dwarf2_per_cu_quick_data::MARK set (see
4987 dw_expand_symtabs_matching_file_matcher), expand the CU and call
4988 EXPANSION_NOTIFY on it. */
4991 dw2_expand_symtabs_matching_one
4992 (struct dwarf2_per_cu_data *per_cu,
4993 gdb::function_view<expand_symtabs_file_matcher_ftype> file_matcher,
4994 gdb::function_view<expand_symtabs_exp_notify_ftype> expansion_notify)
4996 if (file_matcher == NULL || per_cu->v.quick->mark)
4998 bool symtab_was_null
4999 = (per_cu->v.quick->compunit_symtab == NULL);
5001 dw2_instantiate_symtab (per_cu, false);
5003 if (expansion_notify != NULL
5005 && per_cu->v.quick->compunit_symtab != NULL)
5006 expansion_notify (per_cu->v.quick->compunit_symtab);
5010 /* Helper for dw2_expand_matching symtabs. Called on each symbol
5011 matched, to expand corresponding CUs that were marked. IDX is the
5012 index of the symbol name that matched. */
5015 dw2_expand_marked_cus
5016 (struct dwarf2_per_objfile *dwarf2_per_objfile, offset_type idx,
5017 gdb::function_view<expand_symtabs_file_matcher_ftype> file_matcher,
5018 gdb::function_view<expand_symtabs_exp_notify_ftype> expansion_notify,
5021 offset_type *vec, vec_len, vec_idx;
5022 bool global_seen = false;
5023 mapped_index &index = *dwarf2_per_objfile->index_table;
5025 vec = (offset_type *) (index.constant_pool
5026 + MAYBE_SWAP (index.symbol_table[idx].vec));
5027 vec_len = MAYBE_SWAP (vec[0]);
5028 for (vec_idx = 0; vec_idx < vec_len; ++vec_idx)
5030 offset_type cu_index_and_attrs = MAYBE_SWAP (vec[vec_idx + 1]);
5031 /* This value is only valid for index versions >= 7. */
5032 int is_static = GDB_INDEX_SYMBOL_STATIC_VALUE (cu_index_and_attrs);
5033 gdb_index_symbol_kind symbol_kind =
5034 GDB_INDEX_SYMBOL_KIND_VALUE (cu_index_and_attrs);
5035 int cu_index = GDB_INDEX_CU_VALUE (cu_index_and_attrs);
5036 /* Only check the symbol attributes if they're present.
5037 Indices prior to version 7 don't record them,
5038 and indices >= 7 may elide them for certain symbols
5039 (gold does this). */
5042 && symbol_kind != GDB_INDEX_SYMBOL_KIND_NONE);
5044 /* Work around gold/15646. */
5047 if (!is_static && global_seen)
5053 /* Only check the symbol's kind if it has one. */
5058 case VARIABLES_DOMAIN:
5059 if (symbol_kind != GDB_INDEX_SYMBOL_KIND_VARIABLE)
5062 case FUNCTIONS_DOMAIN:
5063 if (symbol_kind != GDB_INDEX_SYMBOL_KIND_FUNCTION)
5067 if (symbol_kind != GDB_INDEX_SYMBOL_KIND_TYPE)
5075 /* Don't crash on bad data. */
5076 if (cu_index >= (dwarf2_per_objfile->all_comp_units.size ()
5077 + dwarf2_per_objfile->all_type_units.size ()))
5079 complaint (_(".gdb_index entry has bad CU index"
5081 objfile_name (dwarf2_per_objfile->objfile));
5085 dwarf2_per_cu_data *per_cu = dwarf2_per_objfile->get_cutu (cu_index);
5086 dw2_expand_symtabs_matching_one (per_cu, file_matcher,
5091 /* If FILE_MATCHER is non-NULL, set all the
5092 dwarf2_per_cu_quick_data::MARK of the current DWARF2_PER_OBJFILE
5093 that match FILE_MATCHER. */
5096 dw_expand_symtabs_matching_file_matcher
5097 (struct dwarf2_per_objfile *dwarf2_per_objfile,
5098 gdb::function_view<expand_symtabs_file_matcher_ftype> file_matcher)
5100 if (file_matcher == NULL)
5103 objfile *const objfile = dwarf2_per_objfile->objfile;
5105 htab_up visited_found (htab_create_alloc (10, htab_hash_pointer,
5107 NULL, xcalloc, xfree));
5108 htab_up visited_not_found (htab_create_alloc (10, htab_hash_pointer,
5110 NULL, xcalloc, xfree));
5112 /* The rule is CUs specify all the files, including those used by
5113 any TU, so there's no need to scan TUs here. */
5115 for (dwarf2_per_cu_data *per_cu : dwarf2_per_objfile->all_comp_units)
5119 per_cu->v.quick->mark = 0;
5121 /* We only need to look at symtabs not already expanded. */
5122 if (per_cu->v.quick->compunit_symtab)
5125 quick_file_names *file_data = dw2_get_file_names (per_cu);
5126 if (file_data == NULL)
5129 if (htab_find (visited_not_found.get (), file_data) != NULL)
5131 else if (htab_find (visited_found.get (), file_data) != NULL)
5133 per_cu->v.quick->mark = 1;
5137 for (int j = 0; j < file_data->num_file_names; ++j)
5139 const char *this_real_name;
5141 if (file_matcher (file_data->file_names[j], false))
5143 per_cu->v.quick->mark = 1;
5147 /* Before we invoke realpath, which can get expensive when many
5148 files are involved, do a quick comparison of the basenames. */
5149 if (!basenames_may_differ
5150 && !file_matcher (lbasename (file_data->file_names[j]),
5154 this_real_name = dw2_get_real_path (objfile, file_data, j);
5155 if (file_matcher (this_real_name, false))
5157 per_cu->v.quick->mark = 1;
5162 void **slot = htab_find_slot (per_cu->v.quick->mark
5163 ? visited_found.get ()
5164 : visited_not_found.get (),
5171 dw2_expand_symtabs_matching
5172 (struct objfile *objfile,
5173 gdb::function_view<expand_symtabs_file_matcher_ftype> file_matcher,
5174 const lookup_name_info &lookup_name,
5175 gdb::function_view<expand_symtabs_symbol_matcher_ftype> symbol_matcher,
5176 gdb::function_view<expand_symtabs_exp_notify_ftype> expansion_notify,
5177 enum search_domain kind)
5179 struct dwarf2_per_objfile *dwarf2_per_objfile
5180 = get_dwarf2_per_objfile (objfile);
5182 /* index_table is NULL if OBJF_READNOW. */
5183 if (!dwarf2_per_objfile->index_table)
5186 dw_expand_symtabs_matching_file_matcher (dwarf2_per_objfile, file_matcher);
5188 mapped_index &index = *dwarf2_per_objfile->index_table;
5190 dw2_expand_symtabs_matching_symbol (index, lookup_name,
5192 kind, [&] (offset_type idx)
5194 dw2_expand_marked_cus (dwarf2_per_objfile, idx, file_matcher,
5195 expansion_notify, kind);
5199 /* A helper for dw2_find_pc_sect_compunit_symtab which finds the most specific
5202 static struct compunit_symtab *
5203 recursively_find_pc_sect_compunit_symtab (struct compunit_symtab *cust,
5208 if (COMPUNIT_BLOCKVECTOR (cust) != NULL
5209 && blockvector_contains_pc (COMPUNIT_BLOCKVECTOR (cust), pc))
5212 if (cust->includes == NULL)
5215 for (i = 0; cust->includes[i]; ++i)
5217 struct compunit_symtab *s = cust->includes[i];
5219 s = recursively_find_pc_sect_compunit_symtab (s, pc);
5227 static struct compunit_symtab *
5228 dw2_find_pc_sect_compunit_symtab (struct objfile *objfile,
5229 struct bound_minimal_symbol msymbol,
5231 struct obj_section *section,
5234 struct dwarf2_per_cu_data *data;
5235 struct compunit_symtab *result;
5237 if (!objfile->psymtabs_addrmap)
5240 data = (struct dwarf2_per_cu_data *) addrmap_find (objfile->psymtabs_addrmap,
5245 if (warn_if_readin && data->v.quick->compunit_symtab)
5246 warning (_("(Internal error: pc %s in read in CU, but not in symtab.)"),
5247 paddress (get_objfile_arch (objfile), pc));
5250 = recursively_find_pc_sect_compunit_symtab (dw2_instantiate_symtab (data,
5253 gdb_assert (result != NULL);
5258 dw2_map_symbol_filenames (struct objfile *objfile, symbol_filename_ftype *fun,
5259 void *data, int need_fullname)
5261 struct dwarf2_per_objfile *dwarf2_per_objfile
5262 = get_dwarf2_per_objfile (objfile);
5264 if (!dwarf2_per_objfile->filenames_cache)
5266 dwarf2_per_objfile->filenames_cache.emplace ();
5268 htab_up visited (htab_create_alloc (10,
5269 htab_hash_pointer, htab_eq_pointer,
5270 NULL, xcalloc, xfree));
5272 /* The rule is CUs specify all the files, including those used
5273 by any TU, so there's no need to scan TUs here. We can
5274 ignore file names coming from already-expanded CUs. */
5276 for (dwarf2_per_cu_data *per_cu : dwarf2_per_objfile->all_comp_units)
5278 if (per_cu->v.quick->compunit_symtab)
5280 void **slot = htab_find_slot (visited.get (),
5281 per_cu->v.quick->file_names,
5284 *slot = per_cu->v.quick->file_names;
5288 for (dwarf2_per_cu_data *per_cu : dwarf2_per_objfile->all_comp_units)
5290 /* We only need to look at symtabs not already expanded. */
5291 if (per_cu->v.quick->compunit_symtab)
5294 quick_file_names *file_data = dw2_get_file_names (per_cu);
5295 if (file_data == NULL)
5298 void **slot = htab_find_slot (visited.get (), file_data, INSERT);
5301 /* Already visited. */
5306 for (int j = 0; j < file_data->num_file_names; ++j)
5308 const char *filename = file_data->file_names[j];
5309 dwarf2_per_objfile->filenames_cache->seen (filename);
5314 dwarf2_per_objfile->filenames_cache->traverse ([&] (const char *filename)
5316 gdb::unique_xmalloc_ptr<char> this_real_name;
5319 this_real_name = gdb_realpath (filename);
5320 (*fun) (filename, this_real_name.get (), data);
5325 dw2_has_symbols (struct objfile *objfile)
5330 const struct quick_symbol_functions dwarf2_gdb_index_functions =
5333 dw2_find_last_source_symtab,
5334 dw2_forget_cached_source_info,
5335 dw2_map_symtabs_matching_filename,
5340 dw2_expand_symtabs_for_function,
5341 dw2_expand_all_symtabs,
5342 dw2_expand_symtabs_with_fullname,
5343 dw2_map_matching_symbols,
5344 dw2_expand_symtabs_matching,
5345 dw2_find_pc_sect_compunit_symtab,
5347 dw2_map_symbol_filenames
5350 /* DWARF-5 debug_names reader. */
5352 /* DWARF-5 augmentation string for GDB's DW_IDX_GNU_* extension. */
5353 static const gdb_byte dwarf5_augmentation[] = { 'G', 'D', 'B', 0 };
5355 /* A helper function that reads the .debug_names section in SECTION
5356 and fills in MAP. FILENAME is the name of the file containing the
5357 section; it is used for error reporting.
5359 Returns true if all went well, false otherwise. */
5362 read_debug_names_from_section (struct objfile *objfile,
5363 const char *filename,
5364 struct dwarf2_section_info *section,
5365 mapped_debug_names &map)
5367 if (dwarf2_section_empty_p (section))
5370 /* Older elfutils strip versions could keep the section in the main
5371 executable while splitting it for the separate debug info file. */
5372 if ((get_section_flags (section) & SEC_HAS_CONTENTS) == 0)
5375 dwarf2_read_section (objfile, section);
5377 map.dwarf5_byte_order = gdbarch_byte_order (get_objfile_arch (objfile));
5379 const gdb_byte *addr = section->buffer;
5381 bfd *const abfd = get_section_bfd_owner (section);
5383 unsigned int bytes_read;
5384 LONGEST length = read_initial_length (abfd, addr, &bytes_read);
5387 map.dwarf5_is_dwarf64 = bytes_read != 4;
5388 map.offset_size = map.dwarf5_is_dwarf64 ? 8 : 4;
5389 if (bytes_read + length != section->size)
5391 /* There may be multiple per-CU indices. */
5392 warning (_("Section .debug_names in %s length %s does not match "
5393 "section length %s, ignoring .debug_names."),
5394 filename, plongest (bytes_read + length),
5395 pulongest (section->size));
5399 /* The version number. */
5400 uint16_t version = read_2_bytes (abfd, addr);
5404 warning (_("Section .debug_names in %s has unsupported version %d, "
5405 "ignoring .debug_names."),
5411 uint16_t padding = read_2_bytes (abfd, addr);
5415 warning (_("Section .debug_names in %s has unsupported padding %d, "
5416 "ignoring .debug_names."),
5421 /* comp_unit_count - The number of CUs in the CU list. */
5422 map.cu_count = read_4_bytes (abfd, addr);
5425 /* local_type_unit_count - The number of TUs in the local TU
5427 map.tu_count = read_4_bytes (abfd, addr);
5430 /* foreign_type_unit_count - The number of TUs in the foreign TU
5432 uint32_t foreign_tu_count = read_4_bytes (abfd, addr);
5434 if (foreign_tu_count != 0)
5436 warning (_("Section .debug_names in %s has unsupported %lu foreign TUs, "
5437 "ignoring .debug_names."),
5438 filename, static_cast<unsigned long> (foreign_tu_count));
5442 /* bucket_count - The number of hash buckets in the hash lookup
5444 map.bucket_count = read_4_bytes (abfd, addr);
5447 /* name_count - The number of unique names in the index. */
5448 map.name_count = read_4_bytes (abfd, addr);
5451 /* abbrev_table_size - The size in bytes of the abbreviations
5453 uint32_t abbrev_table_size = read_4_bytes (abfd, addr);
5456 /* augmentation_string_size - The size in bytes of the augmentation
5457 string. This value is rounded up to a multiple of 4. */
5458 uint32_t augmentation_string_size = read_4_bytes (abfd, addr);
5460 map.augmentation_is_gdb = ((augmentation_string_size
5461 == sizeof (dwarf5_augmentation))
5462 && memcmp (addr, dwarf5_augmentation,
5463 sizeof (dwarf5_augmentation)) == 0);
5464 augmentation_string_size += (-augmentation_string_size) & 3;
5465 addr += augmentation_string_size;
5468 map.cu_table_reordered = addr;
5469 addr += map.cu_count * map.offset_size;
5471 /* List of Local TUs */
5472 map.tu_table_reordered = addr;
5473 addr += map.tu_count * map.offset_size;
5475 /* Hash Lookup Table */
5476 map.bucket_table_reordered = reinterpret_cast<const uint32_t *> (addr);
5477 addr += map.bucket_count * 4;
5478 map.hash_table_reordered = reinterpret_cast<const uint32_t *> (addr);
5479 addr += map.name_count * 4;
5482 map.name_table_string_offs_reordered = addr;
5483 addr += map.name_count * map.offset_size;
5484 map.name_table_entry_offs_reordered = addr;
5485 addr += map.name_count * map.offset_size;
5487 const gdb_byte *abbrev_table_start = addr;
5490 unsigned int bytes_read;
5491 const ULONGEST index_num = read_unsigned_leb128 (abfd, addr, &bytes_read);
5496 const auto insertpair
5497 = map.abbrev_map.emplace (index_num, mapped_debug_names::index_val ());
5498 if (!insertpair.second)
5500 warning (_("Section .debug_names in %s has duplicate index %s, "
5501 "ignoring .debug_names."),
5502 filename, pulongest (index_num));
5505 mapped_debug_names::index_val &indexval = insertpair.first->second;
5506 indexval.dwarf_tag = read_unsigned_leb128 (abfd, addr, &bytes_read);
5511 mapped_debug_names::index_val::attr attr;
5512 attr.dw_idx = read_unsigned_leb128 (abfd, addr, &bytes_read);
5514 attr.form = read_unsigned_leb128 (abfd, addr, &bytes_read);
5516 if (attr.form == DW_FORM_implicit_const)
5518 attr.implicit_const = read_signed_leb128 (abfd, addr,
5522 if (attr.dw_idx == 0 && attr.form == 0)
5524 indexval.attr_vec.push_back (std::move (attr));
5527 if (addr != abbrev_table_start + abbrev_table_size)
5529 warning (_("Section .debug_names in %s has abbreviation_table "
5530 "of size %zu vs. written as %u, ignoring .debug_names."),
5531 filename, addr - abbrev_table_start, abbrev_table_size);
5534 map.entry_pool = addr;
5539 /* A helper for create_cus_from_debug_names that handles the MAP's CU
5543 create_cus_from_debug_names_list (struct dwarf2_per_objfile *dwarf2_per_objfile,
5544 const mapped_debug_names &map,
5545 dwarf2_section_info §ion,
5548 sect_offset sect_off_prev;
5549 for (uint32_t i = 0; i <= map.cu_count; ++i)
5551 sect_offset sect_off_next;
5552 if (i < map.cu_count)
5555 = (sect_offset) (extract_unsigned_integer
5556 (map.cu_table_reordered + i * map.offset_size,
5558 map.dwarf5_byte_order));
5561 sect_off_next = (sect_offset) section.size;
5564 const ULONGEST length = sect_off_next - sect_off_prev;
5565 dwarf2_per_cu_data *per_cu
5566 = create_cu_from_index_list (dwarf2_per_objfile, §ion, is_dwz,
5567 sect_off_prev, length);
5568 dwarf2_per_objfile->all_comp_units.push_back (per_cu);
5570 sect_off_prev = sect_off_next;
5574 /* Read the CU list from the mapped index, and use it to create all
5575 the CU objects for this dwarf2_per_objfile. */
5578 create_cus_from_debug_names (struct dwarf2_per_objfile *dwarf2_per_objfile,
5579 const mapped_debug_names &map,
5580 const mapped_debug_names &dwz_map)
5582 gdb_assert (dwarf2_per_objfile->all_comp_units.empty ());
5583 dwarf2_per_objfile->all_comp_units.reserve (map.cu_count + dwz_map.cu_count);
5585 create_cus_from_debug_names_list (dwarf2_per_objfile, map,
5586 dwarf2_per_objfile->info,
5587 false /* is_dwz */);
5589 if (dwz_map.cu_count == 0)
5592 dwz_file *dwz = dwarf2_get_dwz_file (dwarf2_per_objfile);
5593 create_cus_from_debug_names_list (dwarf2_per_objfile, dwz_map, dwz->info,
5597 /* Read .debug_names. If everything went ok, initialize the "quick"
5598 elements of all the CUs and return true. Otherwise, return false. */
5601 dwarf2_read_debug_names (struct dwarf2_per_objfile *dwarf2_per_objfile)
5603 std::unique_ptr<mapped_debug_names> map
5604 (new mapped_debug_names (dwarf2_per_objfile));
5605 mapped_debug_names dwz_map (dwarf2_per_objfile);
5606 struct objfile *objfile = dwarf2_per_objfile->objfile;
5608 if (!read_debug_names_from_section (objfile, objfile_name (objfile),
5609 &dwarf2_per_objfile->debug_names,
5613 /* Don't use the index if it's empty. */
5614 if (map->name_count == 0)
5617 /* If there is a .dwz file, read it so we can get its CU list as
5619 dwz_file *dwz = dwarf2_get_dwz_file (dwarf2_per_objfile);
5622 if (!read_debug_names_from_section (objfile,
5623 bfd_get_filename (dwz->dwz_bfd),
5624 &dwz->debug_names, dwz_map))
5626 warning (_("could not read '.debug_names' section from %s; skipping"),
5627 bfd_get_filename (dwz->dwz_bfd));
5632 create_cus_from_debug_names (dwarf2_per_objfile, *map, dwz_map);
5634 if (map->tu_count != 0)
5636 /* We can only handle a single .debug_types when we have an
5638 if (VEC_length (dwarf2_section_info_def, dwarf2_per_objfile->types) != 1)
5641 dwarf2_section_info *section = VEC_index (dwarf2_section_info_def,
5642 dwarf2_per_objfile->types, 0);
5644 create_signatured_type_table_from_debug_names
5645 (dwarf2_per_objfile, *map, section, &dwarf2_per_objfile->abbrev);
5648 create_addrmap_from_aranges (dwarf2_per_objfile,
5649 &dwarf2_per_objfile->debug_aranges);
5651 dwarf2_per_objfile->debug_names_table = std::move (map);
5652 dwarf2_per_objfile->using_index = 1;
5653 dwarf2_per_objfile->quick_file_names_table =
5654 create_quick_file_names_table (dwarf2_per_objfile->all_comp_units.size ());
5659 /* Type used to manage iterating over all CUs looking for a symbol for
5662 class dw2_debug_names_iterator
5665 /* If WANT_SPECIFIC_BLOCK is true, only look for symbols in block
5666 BLOCK_INDEX. Otherwise BLOCK_INDEX is ignored. */
5667 dw2_debug_names_iterator (const mapped_debug_names &map,
5668 bool want_specific_block,
5669 block_enum block_index, domain_enum domain,
5671 : m_map (map), m_want_specific_block (want_specific_block),
5672 m_block_index (block_index), m_domain (domain),
5673 m_addr (find_vec_in_debug_names (map, name))
5676 dw2_debug_names_iterator (const mapped_debug_names &map,
5677 search_domain search, uint32_t namei)
5680 m_addr (find_vec_in_debug_names (map, namei))
5683 /* Return the next matching CU or NULL if there are no more. */
5684 dwarf2_per_cu_data *next ();
5687 static const gdb_byte *find_vec_in_debug_names (const mapped_debug_names &map,
5689 static const gdb_byte *find_vec_in_debug_names (const mapped_debug_names &map,
5692 /* The internalized form of .debug_names. */
5693 const mapped_debug_names &m_map;
5695 /* If true, only look for symbols that match BLOCK_INDEX. */
5696 const bool m_want_specific_block = false;
5698 /* One of GLOBAL_BLOCK or STATIC_BLOCK.
5699 Unused if !WANT_SPECIFIC_BLOCK - FIRST_LOCAL_BLOCK is an invalid
5701 const block_enum m_block_index = FIRST_LOCAL_BLOCK;
5703 /* The kind of symbol we're looking for. */
5704 const domain_enum m_domain = UNDEF_DOMAIN;
5705 const search_domain m_search = ALL_DOMAIN;
5707 /* The list of CUs from the index entry of the symbol, or NULL if
5709 const gdb_byte *m_addr;
5713 mapped_debug_names::namei_to_name (uint32_t namei) const
5715 const ULONGEST namei_string_offs
5716 = extract_unsigned_integer ((name_table_string_offs_reordered
5717 + namei * offset_size),
5720 return read_indirect_string_at_offset
5721 (dwarf2_per_objfile, dwarf2_per_objfile->objfile->obfd, namei_string_offs);
5724 /* Find a slot in .debug_names for the object named NAME. If NAME is
5725 found, return pointer to its pool data. If NAME cannot be found,
5729 dw2_debug_names_iterator::find_vec_in_debug_names
5730 (const mapped_debug_names &map, const char *name)
5732 int (*cmp) (const char *, const char *);
5734 if (current_language->la_language == language_cplus
5735 || current_language->la_language == language_fortran
5736 || current_language->la_language == language_d)
5738 /* NAME is already canonical. Drop any qualifiers as
5739 .debug_names does not contain any. */
5741 if (strchr (name, '(') != NULL)
5743 gdb::unique_xmalloc_ptr<char> without_params
5744 = cp_remove_params (name);
5746 if (without_params != NULL)
5748 name = without_params.get();
5753 cmp = (case_sensitivity == case_sensitive_on ? strcmp : strcasecmp);
5755 const uint32_t full_hash = dwarf5_djb_hash (name);
5757 = extract_unsigned_integer (reinterpret_cast<const gdb_byte *>
5758 (map.bucket_table_reordered
5759 + (full_hash % map.bucket_count)), 4,
5760 map.dwarf5_byte_order);
5764 if (namei >= map.name_count)
5766 complaint (_("Wrong .debug_names with name index %u but name_count=%u "
5768 namei, map.name_count,
5769 objfile_name (map.dwarf2_per_objfile->objfile));
5775 const uint32_t namei_full_hash
5776 = extract_unsigned_integer (reinterpret_cast<const gdb_byte *>
5777 (map.hash_table_reordered + namei), 4,
5778 map.dwarf5_byte_order);
5779 if (full_hash % map.bucket_count != namei_full_hash % map.bucket_count)
5782 if (full_hash == namei_full_hash)
5784 const char *const namei_string = map.namei_to_name (namei);
5786 #if 0 /* An expensive sanity check. */
5787 if (namei_full_hash != dwarf5_djb_hash (namei_string))
5789 complaint (_("Wrong .debug_names hash for string at index %u "
5791 namei, objfile_name (dwarf2_per_objfile->objfile));
5796 if (cmp (namei_string, name) == 0)
5798 const ULONGEST namei_entry_offs
5799 = extract_unsigned_integer ((map.name_table_entry_offs_reordered
5800 + namei * map.offset_size),
5801 map.offset_size, map.dwarf5_byte_order);
5802 return map.entry_pool + namei_entry_offs;
5807 if (namei >= map.name_count)
5813 dw2_debug_names_iterator::find_vec_in_debug_names
5814 (const mapped_debug_names &map, uint32_t namei)
5816 if (namei >= map.name_count)
5818 complaint (_("Wrong .debug_names with name index %u but name_count=%u "
5820 namei, map.name_count,
5821 objfile_name (map.dwarf2_per_objfile->objfile));
5825 const ULONGEST namei_entry_offs
5826 = extract_unsigned_integer ((map.name_table_entry_offs_reordered
5827 + namei * map.offset_size),
5828 map.offset_size, map.dwarf5_byte_order);
5829 return map.entry_pool + namei_entry_offs;
5832 /* See dw2_debug_names_iterator. */
5834 dwarf2_per_cu_data *
5835 dw2_debug_names_iterator::next ()
5840 struct dwarf2_per_objfile *dwarf2_per_objfile = m_map.dwarf2_per_objfile;
5841 struct objfile *objfile = dwarf2_per_objfile->objfile;
5842 bfd *const abfd = objfile->obfd;
5846 unsigned int bytes_read;
5847 const ULONGEST abbrev = read_unsigned_leb128 (abfd, m_addr, &bytes_read);
5848 m_addr += bytes_read;
5852 const auto indexval_it = m_map.abbrev_map.find (abbrev);
5853 if (indexval_it == m_map.abbrev_map.cend ())
5855 complaint (_("Wrong .debug_names undefined abbrev code %s "
5857 pulongest (abbrev), objfile_name (objfile));
5860 const mapped_debug_names::index_val &indexval = indexval_it->second;
5861 bool have_is_static = false;
5863 dwarf2_per_cu_data *per_cu = NULL;
5864 for (const mapped_debug_names::index_val::attr &attr : indexval.attr_vec)
5869 case DW_FORM_implicit_const:
5870 ull = attr.implicit_const;
5872 case DW_FORM_flag_present:
5876 ull = read_unsigned_leb128 (abfd, m_addr, &bytes_read);
5877 m_addr += bytes_read;
5880 complaint (_("Unsupported .debug_names form %s [in module %s]"),
5881 dwarf_form_name (attr.form),
5882 objfile_name (objfile));
5885 switch (attr.dw_idx)
5887 case DW_IDX_compile_unit:
5888 /* Don't crash on bad data. */
5889 if (ull >= dwarf2_per_objfile->all_comp_units.size ())
5891 complaint (_(".debug_names entry has bad CU index %s"
5894 objfile_name (dwarf2_per_objfile->objfile));
5897 per_cu = dwarf2_per_objfile->get_cutu (ull);
5899 case DW_IDX_type_unit:
5900 /* Don't crash on bad data. */
5901 if (ull >= dwarf2_per_objfile->all_type_units.size ())
5903 complaint (_(".debug_names entry has bad TU index %s"
5906 objfile_name (dwarf2_per_objfile->objfile));
5909 per_cu = &dwarf2_per_objfile->get_tu (ull)->per_cu;
5911 case DW_IDX_GNU_internal:
5912 if (!m_map.augmentation_is_gdb)
5914 have_is_static = true;
5917 case DW_IDX_GNU_external:
5918 if (!m_map.augmentation_is_gdb)
5920 have_is_static = true;
5926 /* Skip if already read in. */
5927 if (per_cu->v.quick->compunit_symtab)
5930 /* Check static vs global. */
5933 const bool want_static = m_block_index != GLOBAL_BLOCK;
5934 if (m_want_specific_block && want_static != is_static)
5938 /* Match dw2_symtab_iter_next, symbol_kind
5939 and debug_names::psymbol_tag. */
5943 switch (indexval.dwarf_tag)
5945 case DW_TAG_variable:
5946 case DW_TAG_subprogram:
5947 /* Some types are also in VAR_DOMAIN. */
5948 case DW_TAG_typedef:
5949 case DW_TAG_structure_type:
5956 switch (indexval.dwarf_tag)
5958 case DW_TAG_typedef:
5959 case DW_TAG_structure_type:
5966 switch (indexval.dwarf_tag)
5969 case DW_TAG_variable:
5979 /* Match dw2_expand_symtabs_matching, symbol_kind and
5980 debug_names::psymbol_tag. */
5983 case VARIABLES_DOMAIN:
5984 switch (indexval.dwarf_tag)
5986 case DW_TAG_variable:
5992 case FUNCTIONS_DOMAIN:
5993 switch (indexval.dwarf_tag)
5995 case DW_TAG_subprogram:
6002 switch (indexval.dwarf_tag)
6004 case DW_TAG_typedef:
6005 case DW_TAG_structure_type:
6018 static struct compunit_symtab *
6019 dw2_debug_names_lookup_symbol (struct objfile *objfile, int block_index_int,
6020 const char *name, domain_enum domain)
6022 const block_enum block_index = static_cast<block_enum> (block_index_int);
6023 struct dwarf2_per_objfile *dwarf2_per_objfile
6024 = get_dwarf2_per_objfile (objfile);
6026 const auto &mapp = dwarf2_per_objfile->debug_names_table;
6029 /* index is NULL if OBJF_READNOW. */
6032 const auto &map = *mapp;
6034 dw2_debug_names_iterator iter (map, true /* want_specific_block */,
6035 block_index, domain, name);
6037 struct compunit_symtab *stab_best = NULL;
6038 struct dwarf2_per_cu_data *per_cu;
6039 while ((per_cu = iter.next ()) != NULL)
6041 struct symbol *sym, *with_opaque = NULL;
6042 struct compunit_symtab *stab = dw2_instantiate_symtab (per_cu, false);
6043 const struct blockvector *bv = COMPUNIT_BLOCKVECTOR (stab);
6044 struct block *block = BLOCKVECTOR_BLOCK (bv, block_index);
6046 sym = block_find_symbol (block, name, domain,
6047 block_find_non_opaque_type_preferred,
6050 /* Some caution must be observed with overloaded functions and
6051 methods, since the index will not contain any overload
6052 information (but NAME might contain it). */
6055 && strcmp_iw (SYMBOL_SEARCH_NAME (sym), name) == 0)
6057 if (with_opaque != NULL
6058 && strcmp_iw (SYMBOL_SEARCH_NAME (with_opaque), name) == 0)
6061 /* Keep looking through other CUs. */
6067 /* This dumps minimal information about .debug_names. It is called
6068 via "mt print objfiles". The gdb.dwarf2/gdb-index.exp testcase
6069 uses this to verify that .debug_names has been loaded. */
6072 dw2_debug_names_dump (struct objfile *objfile)
6074 struct dwarf2_per_objfile *dwarf2_per_objfile
6075 = get_dwarf2_per_objfile (objfile);
6077 gdb_assert (dwarf2_per_objfile->using_index);
6078 printf_filtered (".debug_names:");
6079 if (dwarf2_per_objfile->debug_names_table)
6080 printf_filtered (" exists\n");
6082 printf_filtered (" faked for \"readnow\"\n");
6083 printf_filtered ("\n");
6087 dw2_debug_names_expand_symtabs_for_function (struct objfile *objfile,
6088 const char *func_name)
6090 struct dwarf2_per_objfile *dwarf2_per_objfile
6091 = get_dwarf2_per_objfile (objfile);
6093 /* dwarf2_per_objfile->debug_names_table is NULL if OBJF_READNOW. */
6094 if (dwarf2_per_objfile->debug_names_table)
6096 const mapped_debug_names &map = *dwarf2_per_objfile->debug_names_table;
6098 /* Note: It doesn't matter what we pass for block_index here. */
6099 dw2_debug_names_iterator iter (map, false /* want_specific_block */,
6100 GLOBAL_BLOCK, VAR_DOMAIN, func_name);
6102 struct dwarf2_per_cu_data *per_cu;
6103 while ((per_cu = iter.next ()) != NULL)
6104 dw2_instantiate_symtab (per_cu, false);
6109 dw2_debug_names_expand_symtabs_matching
6110 (struct objfile *objfile,
6111 gdb::function_view<expand_symtabs_file_matcher_ftype> file_matcher,
6112 const lookup_name_info &lookup_name,
6113 gdb::function_view<expand_symtabs_symbol_matcher_ftype> symbol_matcher,
6114 gdb::function_view<expand_symtabs_exp_notify_ftype> expansion_notify,
6115 enum search_domain kind)
6117 struct dwarf2_per_objfile *dwarf2_per_objfile
6118 = get_dwarf2_per_objfile (objfile);
6120 /* debug_names_table is NULL if OBJF_READNOW. */
6121 if (!dwarf2_per_objfile->debug_names_table)
6124 dw_expand_symtabs_matching_file_matcher (dwarf2_per_objfile, file_matcher);
6126 mapped_debug_names &map = *dwarf2_per_objfile->debug_names_table;
6128 dw2_expand_symtabs_matching_symbol (map, lookup_name,
6130 kind, [&] (offset_type namei)
6132 /* The name was matched, now expand corresponding CUs that were
6134 dw2_debug_names_iterator iter (map, kind, namei);
6136 struct dwarf2_per_cu_data *per_cu;
6137 while ((per_cu = iter.next ()) != NULL)
6138 dw2_expand_symtabs_matching_one (per_cu, file_matcher,
6143 const struct quick_symbol_functions dwarf2_debug_names_functions =
6146 dw2_find_last_source_symtab,
6147 dw2_forget_cached_source_info,
6148 dw2_map_symtabs_matching_filename,
6149 dw2_debug_names_lookup_symbol,
6151 dw2_debug_names_dump,
6153 dw2_debug_names_expand_symtabs_for_function,
6154 dw2_expand_all_symtabs,
6155 dw2_expand_symtabs_with_fullname,
6156 dw2_map_matching_symbols,
6157 dw2_debug_names_expand_symtabs_matching,
6158 dw2_find_pc_sect_compunit_symtab,
6160 dw2_map_symbol_filenames
6163 /* See symfile.h. */
6166 dwarf2_initialize_objfile (struct objfile *objfile, dw_index_kind *index_kind)
6168 struct dwarf2_per_objfile *dwarf2_per_objfile
6169 = get_dwarf2_per_objfile (objfile);
6171 /* If we're about to read full symbols, don't bother with the
6172 indices. In this case we also don't care if some other debug
6173 format is making psymtabs, because they are all about to be
6175 if ((objfile->flags & OBJF_READNOW))
6177 dwarf2_per_objfile->using_index = 1;
6178 create_all_comp_units (dwarf2_per_objfile);
6179 create_all_type_units (dwarf2_per_objfile);
6180 dwarf2_per_objfile->quick_file_names_table
6181 = create_quick_file_names_table
6182 (dwarf2_per_objfile->all_comp_units.size ());
6184 for (int i = 0; i < (dwarf2_per_objfile->all_comp_units.size ()
6185 + dwarf2_per_objfile->all_type_units.size ()); ++i)
6187 dwarf2_per_cu_data *per_cu = dwarf2_per_objfile->get_cutu (i);
6189 per_cu->v.quick = OBSTACK_ZALLOC (&objfile->objfile_obstack,
6190 struct dwarf2_per_cu_quick_data);
6193 /* Return 1 so that gdb sees the "quick" functions. However,
6194 these functions will be no-ops because we will have expanded
6196 *index_kind = dw_index_kind::GDB_INDEX;
6200 if (dwarf2_read_debug_names (dwarf2_per_objfile))
6202 *index_kind = dw_index_kind::DEBUG_NAMES;
6206 if (dwarf2_read_gdb_index (dwarf2_per_objfile))
6208 *index_kind = dw_index_kind::GDB_INDEX;
6217 /* Build a partial symbol table. */
6220 dwarf2_build_psymtabs (struct objfile *objfile)
6222 struct dwarf2_per_objfile *dwarf2_per_objfile
6223 = get_dwarf2_per_objfile (objfile);
6225 if (objfile->global_psymbols.capacity () == 0
6226 && objfile->static_psymbols.capacity () == 0)
6227 init_psymbol_list (objfile, 1024);
6231 /* This isn't really ideal: all the data we allocate on the
6232 objfile's obstack is still uselessly kept around. However,
6233 freeing it seems unsafe. */
6234 psymtab_discarder psymtabs (objfile);
6235 dwarf2_build_psymtabs_hard (dwarf2_per_objfile);
6238 CATCH (except, RETURN_MASK_ERROR)
6240 exception_print (gdb_stderr, except);
6245 /* Return the total length of the CU described by HEADER. */
6248 get_cu_length (const struct comp_unit_head *header)
6250 return header->initial_length_size + header->length;
6253 /* Return TRUE if SECT_OFF is within CU_HEADER. */
6256 offset_in_cu_p (const comp_unit_head *cu_header, sect_offset sect_off)
6258 sect_offset bottom = cu_header->sect_off;
6259 sect_offset top = cu_header->sect_off + get_cu_length (cu_header);
6261 return sect_off >= bottom && sect_off < top;
6264 /* Find the base address of the compilation unit for range lists and
6265 location lists. It will normally be specified by DW_AT_low_pc.
6266 In DWARF-3 draft 4, the base address could be overridden by
6267 DW_AT_entry_pc. It's been removed, but GCC still uses this for
6268 compilation units with discontinuous ranges. */
6271 dwarf2_find_base_address (struct die_info *die, struct dwarf2_cu *cu)
6273 struct attribute *attr;
6276 cu->base_address = 0;
6278 attr = dwarf2_attr (die, DW_AT_entry_pc, cu);
6281 cu->base_address = attr_value_as_address (attr);
6286 attr = dwarf2_attr (die, DW_AT_low_pc, cu);
6289 cu->base_address = attr_value_as_address (attr);
6295 /* Read in the comp unit header information from the debug_info at info_ptr.
6296 Use rcuh_kind::COMPILE as the default type if not known by the caller.
6297 NOTE: This leaves members offset, first_die_offset to be filled in
6300 static const gdb_byte *
6301 read_comp_unit_head (struct comp_unit_head *cu_header,
6302 const gdb_byte *info_ptr,
6303 struct dwarf2_section_info *section,
6304 rcuh_kind section_kind)
6307 unsigned int bytes_read;
6308 const char *filename = get_section_file_name (section);
6309 bfd *abfd = get_section_bfd_owner (section);
6311 cu_header->length = read_initial_length (abfd, info_ptr, &bytes_read);
6312 cu_header->initial_length_size = bytes_read;
6313 cu_header->offset_size = (bytes_read == 4) ? 4 : 8;
6314 info_ptr += bytes_read;
6315 cu_header->version = read_2_bytes (abfd, info_ptr);
6316 if (cu_header->version < 2 || cu_header->version > 5)
6317 error (_("Dwarf Error: wrong version in compilation unit header "
6318 "(is %d, should be 2, 3, 4 or 5) [in module %s]"),
6319 cu_header->version, filename);
6321 if (cu_header->version < 5)
6322 switch (section_kind)
6324 case rcuh_kind::COMPILE:
6325 cu_header->unit_type = DW_UT_compile;
6327 case rcuh_kind::TYPE:
6328 cu_header->unit_type = DW_UT_type;
6331 internal_error (__FILE__, __LINE__,
6332 _("read_comp_unit_head: invalid section_kind"));
6336 cu_header->unit_type = static_cast<enum dwarf_unit_type>
6337 (read_1_byte (abfd, info_ptr));
6339 switch (cu_header->unit_type)
6342 if (section_kind != rcuh_kind::COMPILE)
6343 error (_("Dwarf Error: wrong unit_type in compilation unit header "
6344 "(is DW_UT_compile, should be DW_UT_type) [in module %s]"),
6348 section_kind = rcuh_kind::TYPE;
6351 error (_("Dwarf Error: wrong unit_type in compilation unit header "
6352 "(is %d, should be %d or %d) [in module %s]"),
6353 cu_header->unit_type, DW_UT_compile, DW_UT_type, filename);
6356 cu_header->addr_size = read_1_byte (abfd, info_ptr);
6359 cu_header->abbrev_sect_off = (sect_offset) read_offset (abfd, info_ptr,
6362 info_ptr += bytes_read;
6363 if (cu_header->version < 5)
6365 cu_header->addr_size = read_1_byte (abfd, info_ptr);
6368 signed_addr = bfd_get_sign_extend_vma (abfd);
6369 if (signed_addr < 0)
6370 internal_error (__FILE__, __LINE__,
6371 _("read_comp_unit_head: dwarf from non elf file"));
6372 cu_header->signed_addr_p = signed_addr;
6374 if (section_kind == rcuh_kind::TYPE)
6376 LONGEST type_offset;
6378 cu_header->signature = read_8_bytes (abfd, info_ptr);
6381 type_offset = read_offset (abfd, info_ptr, cu_header, &bytes_read);
6382 info_ptr += bytes_read;
6383 cu_header->type_cu_offset_in_tu = (cu_offset) type_offset;
6384 if (to_underlying (cu_header->type_cu_offset_in_tu) != type_offset)
6385 error (_("Dwarf Error: Too big type_offset in compilation unit "
6386 "header (is %s) [in module %s]"), plongest (type_offset),
6393 /* Helper function that returns the proper abbrev section for
6396 static struct dwarf2_section_info *
6397 get_abbrev_section_for_cu (struct dwarf2_per_cu_data *this_cu)
6399 struct dwarf2_section_info *abbrev;
6400 struct dwarf2_per_objfile *dwarf2_per_objfile = this_cu->dwarf2_per_objfile;
6402 if (this_cu->is_dwz)
6403 abbrev = &dwarf2_get_dwz_file (dwarf2_per_objfile)->abbrev;
6405 abbrev = &dwarf2_per_objfile->abbrev;
6410 /* Subroutine of read_and_check_comp_unit_head and
6411 read_and_check_type_unit_head to simplify them.
6412 Perform various error checking on the header. */
6415 error_check_comp_unit_head (struct dwarf2_per_objfile *dwarf2_per_objfile,
6416 struct comp_unit_head *header,
6417 struct dwarf2_section_info *section,
6418 struct dwarf2_section_info *abbrev_section)
6420 const char *filename = get_section_file_name (section);
6422 if (to_underlying (header->abbrev_sect_off)
6423 >= dwarf2_section_size (dwarf2_per_objfile->objfile, abbrev_section))
6424 error (_("Dwarf Error: bad offset (%s) in compilation unit header "
6425 "(offset %s + 6) [in module %s]"),
6426 sect_offset_str (header->abbrev_sect_off),
6427 sect_offset_str (header->sect_off),
6430 /* Cast to ULONGEST to use 64-bit arithmetic when possible to
6431 avoid potential 32-bit overflow. */
6432 if (((ULONGEST) header->sect_off + get_cu_length (header))
6434 error (_("Dwarf Error: bad length (0x%x) in compilation unit header "
6435 "(offset %s + 0) [in module %s]"),
6436 header->length, sect_offset_str (header->sect_off),
6440 /* Read in a CU/TU header and perform some basic error checking.
6441 The contents of the header are stored in HEADER.
6442 The result is a pointer to the start of the first DIE. */
6444 static const gdb_byte *
6445 read_and_check_comp_unit_head (struct dwarf2_per_objfile *dwarf2_per_objfile,
6446 struct comp_unit_head *header,
6447 struct dwarf2_section_info *section,
6448 struct dwarf2_section_info *abbrev_section,
6449 const gdb_byte *info_ptr,
6450 rcuh_kind section_kind)
6452 const gdb_byte *beg_of_comp_unit = info_ptr;
6454 header->sect_off = (sect_offset) (beg_of_comp_unit - section->buffer);
6456 info_ptr = read_comp_unit_head (header, info_ptr, section, section_kind);
6458 header->first_die_cu_offset = (cu_offset) (info_ptr - beg_of_comp_unit);
6460 error_check_comp_unit_head (dwarf2_per_objfile, header, section,
6466 /* Fetch the abbreviation table offset from a comp or type unit header. */
6469 read_abbrev_offset (struct dwarf2_per_objfile *dwarf2_per_objfile,
6470 struct dwarf2_section_info *section,
6471 sect_offset sect_off)
6473 bfd *abfd = get_section_bfd_owner (section);
6474 const gdb_byte *info_ptr;
6475 unsigned int initial_length_size, offset_size;
6478 dwarf2_read_section (dwarf2_per_objfile->objfile, section);
6479 info_ptr = section->buffer + to_underlying (sect_off);
6480 read_initial_length (abfd, info_ptr, &initial_length_size);
6481 offset_size = initial_length_size == 4 ? 4 : 8;
6482 info_ptr += initial_length_size;
6484 version = read_2_bytes (abfd, info_ptr);
6488 /* Skip unit type and address size. */
6492 return (sect_offset) read_offset_1 (abfd, info_ptr, offset_size);
6495 /* Allocate a new partial symtab for file named NAME and mark this new
6496 partial symtab as being an include of PST. */
6499 dwarf2_create_include_psymtab (const char *name, struct partial_symtab *pst,
6500 struct objfile *objfile)
6502 struct partial_symtab *subpst = allocate_psymtab (name, objfile);
6504 if (!IS_ABSOLUTE_PATH (subpst->filename))
6506 /* It shares objfile->objfile_obstack. */
6507 subpst->dirname = pst->dirname;
6510 subpst->textlow = 0;
6511 subpst->texthigh = 0;
6513 subpst->dependencies
6514 = XOBNEW (&objfile->objfile_obstack, struct partial_symtab *);
6515 subpst->dependencies[0] = pst;
6516 subpst->number_of_dependencies = 1;
6518 subpst->globals_offset = 0;
6519 subpst->n_global_syms = 0;
6520 subpst->statics_offset = 0;
6521 subpst->n_static_syms = 0;
6522 subpst->compunit_symtab = NULL;
6523 subpst->read_symtab = pst->read_symtab;
6526 /* No private part is necessary for include psymtabs. This property
6527 can be used to differentiate between such include psymtabs and
6528 the regular ones. */
6529 subpst->read_symtab_private = NULL;
6532 /* Read the Line Number Program data and extract the list of files
6533 included by the source file represented by PST. Build an include
6534 partial symtab for each of these included files. */
6537 dwarf2_build_include_psymtabs (struct dwarf2_cu *cu,
6538 struct die_info *die,
6539 struct partial_symtab *pst)
6542 struct attribute *attr;
6544 attr = dwarf2_attr (die, DW_AT_stmt_list, cu);
6546 lh = dwarf_decode_line_header ((sect_offset) DW_UNSND (attr), cu);
6548 return; /* No linetable, so no includes. */
6550 /* NOTE: pst->dirname is DW_AT_comp_dir (if present). */
6551 dwarf_decode_lines (lh.get (), pst->dirname, cu, pst, pst->textlow, 1);
6555 hash_signatured_type (const void *item)
6557 const struct signatured_type *sig_type
6558 = (const struct signatured_type *) item;
6560 /* This drops the top 32 bits of the signature, but is ok for a hash. */
6561 return sig_type->signature;
6565 eq_signatured_type (const void *item_lhs, const void *item_rhs)
6567 const struct signatured_type *lhs = (const struct signatured_type *) item_lhs;
6568 const struct signatured_type *rhs = (const struct signatured_type *) item_rhs;
6570 return lhs->signature == rhs->signature;
6573 /* Allocate a hash table for signatured types. */
6576 allocate_signatured_type_table (struct objfile *objfile)
6578 return htab_create_alloc_ex (41,
6579 hash_signatured_type,
6582 &objfile->objfile_obstack,
6583 hashtab_obstack_allocate,
6584 dummy_obstack_deallocate);
6587 /* A helper function to add a signatured type CU to a table. */
6590 add_signatured_type_cu_to_table (void **slot, void *datum)
6592 struct signatured_type *sigt = (struct signatured_type *) *slot;
6593 std::vector<signatured_type *> *all_type_units
6594 = (std::vector<signatured_type *> *) datum;
6596 all_type_units->push_back (sigt);
6601 /* A helper for create_debug_types_hash_table. Read types from SECTION
6602 and fill them into TYPES_HTAB. It will process only type units,
6603 therefore DW_UT_type. */
6606 create_debug_type_hash_table (struct dwarf2_per_objfile *dwarf2_per_objfile,
6607 struct dwo_file *dwo_file,
6608 dwarf2_section_info *section, htab_t &types_htab,
6609 rcuh_kind section_kind)
6611 struct objfile *objfile = dwarf2_per_objfile->objfile;
6612 struct dwarf2_section_info *abbrev_section;
6614 const gdb_byte *info_ptr, *end_ptr;
6616 abbrev_section = (dwo_file != NULL
6617 ? &dwo_file->sections.abbrev
6618 : &dwarf2_per_objfile->abbrev);
6620 if (dwarf_read_debug)
6621 fprintf_unfiltered (gdb_stdlog, "Reading %s for %s:\n",
6622 get_section_name (section),
6623 get_section_file_name (abbrev_section));
6625 dwarf2_read_section (objfile, section);
6626 info_ptr = section->buffer;
6628 if (info_ptr == NULL)
6631 /* We can't set abfd until now because the section may be empty or
6632 not present, in which case the bfd is unknown. */
6633 abfd = get_section_bfd_owner (section);
6635 /* We don't use init_cutu_and_read_dies_simple, or some such, here
6636 because we don't need to read any dies: the signature is in the
6639 end_ptr = info_ptr + section->size;
6640 while (info_ptr < end_ptr)
6642 struct signatured_type *sig_type;
6643 struct dwo_unit *dwo_tu;
6645 const gdb_byte *ptr = info_ptr;
6646 struct comp_unit_head header;
6647 unsigned int length;
6649 sect_offset sect_off = (sect_offset) (ptr - section->buffer);
6651 /* Initialize it due to a false compiler warning. */
6652 header.signature = -1;
6653 header.type_cu_offset_in_tu = (cu_offset) -1;
6655 /* We need to read the type's signature in order to build the hash
6656 table, but we don't need anything else just yet. */
6658 ptr = read_and_check_comp_unit_head (dwarf2_per_objfile, &header, section,
6659 abbrev_section, ptr, section_kind);
6661 length = get_cu_length (&header);
6663 /* Skip dummy type units. */
6664 if (ptr >= info_ptr + length
6665 || peek_abbrev_code (abfd, ptr) == 0
6666 || header.unit_type != DW_UT_type)
6672 if (types_htab == NULL)
6675 types_htab = allocate_dwo_unit_table (objfile);
6677 types_htab = allocate_signatured_type_table (objfile);
6683 dwo_tu = OBSTACK_ZALLOC (&objfile->objfile_obstack,
6685 dwo_tu->dwo_file = dwo_file;
6686 dwo_tu->signature = header.signature;
6687 dwo_tu->type_offset_in_tu = header.type_cu_offset_in_tu;
6688 dwo_tu->section = section;
6689 dwo_tu->sect_off = sect_off;
6690 dwo_tu->length = length;
6694 /* N.B.: type_offset is not usable if this type uses a DWO file.
6695 The real type_offset is in the DWO file. */
6697 sig_type = OBSTACK_ZALLOC (&objfile->objfile_obstack,
6698 struct signatured_type);
6699 sig_type->signature = header.signature;
6700 sig_type->type_offset_in_tu = header.type_cu_offset_in_tu;
6701 sig_type->per_cu.dwarf2_per_objfile = dwarf2_per_objfile;
6702 sig_type->per_cu.is_debug_types = 1;
6703 sig_type->per_cu.section = section;
6704 sig_type->per_cu.sect_off = sect_off;
6705 sig_type->per_cu.length = length;
6708 slot = htab_find_slot (types_htab,
6709 dwo_file ? (void*) dwo_tu : (void *) sig_type,
6711 gdb_assert (slot != NULL);
6714 sect_offset dup_sect_off;
6718 const struct dwo_unit *dup_tu
6719 = (const struct dwo_unit *) *slot;
6721 dup_sect_off = dup_tu->sect_off;
6725 const struct signatured_type *dup_tu
6726 = (const struct signatured_type *) *slot;
6728 dup_sect_off = dup_tu->per_cu.sect_off;
6731 complaint (_("debug type entry at offset %s is duplicate to"
6732 " the entry at offset %s, signature %s"),
6733 sect_offset_str (sect_off), sect_offset_str (dup_sect_off),
6734 hex_string (header.signature));
6736 *slot = dwo_file ? (void *) dwo_tu : (void *) sig_type;
6738 if (dwarf_read_debug > 1)
6739 fprintf_unfiltered (gdb_stdlog, " offset %s, signature %s\n",
6740 sect_offset_str (sect_off),
6741 hex_string (header.signature));
6747 /* Create the hash table of all entries in the .debug_types
6748 (or .debug_types.dwo) section(s).
6749 If reading a DWO file, then DWO_FILE is a pointer to the DWO file object,
6750 otherwise it is NULL.
6752 The result is a pointer to the hash table or NULL if there are no types.
6754 Note: This function processes DWO files only, not DWP files. */
6757 create_debug_types_hash_table (struct dwarf2_per_objfile *dwarf2_per_objfile,
6758 struct dwo_file *dwo_file,
6759 VEC (dwarf2_section_info_def) *types,
6763 struct dwarf2_section_info *section;
6765 if (VEC_empty (dwarf2_section_info_def, types))
6769 VEC_iterate (dwarf2_section_info_def, types, ix, section);
6771 create_debug_type_hash_table (dwarf2_per_objfile, dwo_file, section,
6772 types_htab, rcuh_kind::TYPE);
6775 /* Create the hash table of all entries in the .debug_types section,
6776 and initialize all_type_units.
6777 The result is zero if there is an error (e.g. missing .debug_types section),
6778 otherwise non-zero. */
6781 create_all_type_units (struct dwarf2_per_objfile *dwarf2_per_objfile)
6783 htab_t types_htab = NULL;
6785 create_debug_type_hash_table (dwarf2_per_objfile, NULL,
6786 &dwarf2_per_objfile->info, types_htab,
6787 rcuh_kind::COMPILE);
6788 create_debug_types_hash_table (dwarf2_per_objfile, NULL,
6789 dwarf2_per_objfile->types, types_htab);
6790 if (types_htab == NULL)
6792 dwarf2_per_objfile->signatured_types = NULL;
6796 dwarf2_per_objfile->signatured_types = types_htab;
6798 gdb_assert (dwarf2_per_objfile->all_type_units.empty ());
6799 dwarf2_per_objfile->all_type_units.reserve (htab_elements (types_htab));
6801 htab_traverse_noresize (types_htab, add_signatured_type_cu_to_table,
6802 &dwarf2_per_objfile->all_type_units);
6807 /* Add an entry for signature SIG to dwarf2_per_objfile->signatured_types.
6808 If SLOT is non-NULL, it is the entry to use in the hash table.
6809 Otherwise we find one. */
6811 static struct signatured_type *
6812 add_type_unit (struct dwarf2_per_objfile *dwarf2_per_objfile, ULONGEST sig,
6815 struct objfile *objfile = dwarf2_per_objfile->objfile;
6817 if (dwarf2_per_objfile->all_type_units.size ()
6818 == dwarf2_per_objfile->all_type_units.capacity ())
6819 ++dwarf2_per_objfile->tu_stats.nr_all_type_units_reallocs;
6821 signatured_type *sig_type = OBSTACK_ZALLOC (&objfile->objfile_obstack,
6822 struct signatured_type);
6824 dwarf2_per_objfile->all_type_units.push_back (sig_type);
6825 sig_type->signature = sig;
6826 sig_type->per_cu.is_debug_types = 1;
6827 if (dwarf2_per_objfile->using_index)
6829 sig_type->per_cu.v.quick =
6830 OBSTACK_ZALLOC (&objfile->objfile_obstack,
6831 struct dwarf2_per_cu_quick_data);
6836 slot = htab_find_slot (dwarf2_per_objfile->signatured_types,
6839 gdb_assert (*slot == NULL);
6841 /* The rest of sig_type must be filled in by the caller. */
6845 /* Subroutine of lookup_dwo_signatured_type and lookup_dwp_signatured_type.
6846 Fill in SIG_ENTRY with DWO_ENTRY. */
6849 fill_in_sig_entry_from_dwo_entry (struct dwarf2_per_objfile *dwarf2_per_objfile,
6850 struct signatured_type *sig_entry,
6851 struct dwo_unit *dwo_entry)
6853 /* Make sure we're not clobbering something we don't expect to. */
6854 gdb_assert (! sig_entry->per_cu.queued);
6855 gdb_assert (sig_entry->per_cu.cu == NULL);
6856 if (dwarf2_per_objfile->using_index)
6858 gdb_assert (sig_entry->per_cu.v.quick != NULL);
6859 gdb_assert (sig_entry->per_cu.v.quick->compunit_symtab == NULL);
6862 gdb_assert (sig_entry->per_cu.v.psymtab == NULL);
6863 gdb_assert (sig_entry->signature == dwo_entry->signature);
6864 gdb_assert (to_underlying (sig_entry->type_offset_in_section) == 0);
6865 gdb_assert (sig_entry->type_unit_group == NULL);
6866 gdb_assert (sig_entry->dwo_unit == NULL);
6868 sig_entry->per_cu.section = dwo_entry->section;
6869 sig_entry->per_cu.sect_off = dwo_entry->sect_off;
6870 sig_entry->per_cu.length = dwo_entry->length;
6871 sig_entry->per_cu.reading_dwo_directly = 1;
6872 sig_entry->per_cu.dwarf2_per_objfile = dwarf2_per_objfile;
6873 sig_entry->type_offset_in_tu = dwo_entry->type_offset_in_tu;
6874 sig_entry->dwo_unit = dwo_entry;
6877 /* Subroutine of lookup_signatured_type.
6878 If we haven't read the TU yet, create the signatured_type data structure
6879 for a TU to be read in directly from a DWO file, bypassing the stub.
6880 This is the "Stay in DWO Optimization": When there is no DWP file and we're
6881 using .gdb_index, then when reading a CU we want to stay in the DWO file
6882 containing that CU. Otherwise we could end up reading several other DWO
6883 files (due to comdat folding) to process the transitive closure of all the
6884 mentioned TUs, and that can be slow. The current DWO file will have every
6885 type signature that it needs.
6886 We only do this for .gdb_index because in the psymtab case we already have
6887 to read all the DWOs to build the type unit groups. */
6889 static struct signatured_type *
6890 lookup_dwo_signatured_type (struct dwarf2_cu *cu, ULONGEST sig)
6892 struct dwarf2_per_objfile *dwarf2_per_objfile
6893 = cu->per_cu->dwarf2_per_objfile;
6894 struct objfile *objfile = dwarf2_per_objfile->objfile;
6895 struct dwo_file *dwo_file;
6896 struct dwo_unit find_dwo_entry, *dwo_entry;
6897 struct signatured_type find_sig_entry, *sig_entry;
6900 gdb_assert (cu->dwo_unit && dwarf2_per_objfile->using_index);
6902 /* If TU skeletons have been removed then we may not have read in any
6904 if (dwarf2_per_objfile->signatured_types == NULL)
6906 dwarf2_per_objfile->signatured_types
6907 = allocate_signatured_type_table (objfile);
6910 /* We only ever need to read in one copy of a signatured type.
6911 Use the global signatured_types array to do our own comdat-folding
6912 of types. If this is the first time we're reading this TU, and
6913 the TU has an entry in .gdb_index, replace the recorded data from
6914 .gdb_index with this TU. */
6916 find_sig_entry.signature = sig;
6917 slot = htab_find_slot (dwarf2_per_objfile->signatured_types,
6918 &find_sig_entry, INSERT);
6919 sig_entry = (struct signatured_type *) *slot;
6921 /* We can get here with the TU already read, *or* in the process of being
6922 read. Don't reassign the global entry to point to this DWO if that's
6923 the case. Also note that if the TU is already being read, it may not
6924 have come from a DWO, the program may be a mix of Fission-compiled
6925 code and non-Fission-compiled code. */
6927 /* Have we already tried to read this TU?
6928 Note: sig_entry can be NULL if the skeleton TU was removed (thus it
6929 needn't exist in the global table yet). */
6930 if (sig_entry != NULL && sig_entry->per_cu.tu_read)
6933 /* Note: cu->dwo_unit is the dwo_unit that references this TU, not the
6934 dwo_unit of the TU itself. */
6935 dwo_file = cu->dwo_unit->dwo_file;
6937 /* Ok, this is the first time we're reading this TU. */
6938 if (dwo_file->tus == NULL)
6940 find_dwo_entry.signature = sig;
6941 dwo_entry = (struct dwo_unit *) htab_find (dwo_file->tus, &find_dwo_entry);
6942 if (dwo_entry == NULL)
6945 /* If the global table doesn't have an entry for this TU, add one. */
6946 if (sig_entry == NULL)
6947 sig_entry = add_type_unit (dwarf2_per_objfile, sig, slot);
6949 fill_in_sig_entry_from_dwo_entry (dwarf2_per_objfile, sig_entry, dwo_entry);
6950 sig_entry->per_cu.tu_read = 1;
6954 /* Subroutine of lookup_signatured_type.
6955 Look up the type for signature SIG, and if we can't find SIG in .gdb_index
6956 then try the DWP file. If the TU stub (skeleton) has been removed then
6957 it won't be in .gdb_index. */
6959 static struct signatured_type *
6960 lookup_dwp_signatured_type (struct dwarf2_cu *cu, ULONGEST sig)
6962 struct dwarf2_per_objfile *dwarf2_per_objfile
6963 = cu->per_cu->dwarf2_per_objfile;
6964 struct objfile *objfile = dwarf2_per_objfile->objfile;
6965 struct dwp_file *dwp_file = get_dwp_file (dwarf2_per_objfile);
6966 struct dwo_unit *dwo_entry;
6967 struct signatured_type find_sig_entry, *sig_entry;
6970 gdb_assert (cu->dwo_unit && dwarf2_per_objfile->using_index);
6971 gdb_assert (dwp_file != NULL);
6973 /* If TU skeletons have been removed then we may not have read in any
6975 if (dwarf2_per_objfile->signatured_types == NULL)
6977 dwarf2_per_objfile->signatured_types
6978 = allocate_signatured_type_table (objfile);
6981 find_sig_entry.signature = sig;
6982 slot = htab_find_slot (dwarf2_per_objfile->signatured_types,
6983 &find_sig_entry, INSERT);
6984 sig_entry = (struct signatured_type *) *slot;
6986 /* Have we already tried to read this TU?
6987 Note: sig_entry can be NULL if the skeleton TU was removed (thus it
6988 needn't exist in the global table yet). */
6989 if (sig_entry != NULL)
6992 if (dwp_file->tus == NULL)
6994 dwo_entry = lookup_dwo_unit_in_dwp (dwarf2_per_objfile, dwp_file, NULL,
6995 sig, 1 /* is_debug_types */);
6996 if (dwo_entry == NULL)
6999 sig_entry = add_type_unit (dwarf2_per_objfile, sig, slot);
7000 fill_in_sig_entry_from_dwo_entry (dwarf2_per_objfile, sig_entry, dwo_entry);
7005 /* Lookup a signature based type for DW_FORM_ref_sig8.
7006 Returns NULL if signature SIG is not present in the table.
7007 It is up to the caller to complain about this. */
7009 static struct signatured_type *
7010 lookup_signatured_type (struct dwarf2_cu *cu, ULONGEST sig)
7012 struct dwarf2_per_objfile *dwarf2_per_objfile
7013 = cu->per_cu->dwarf2_per_objfile;
7016 && dwarf2_per_objfile->using_index)
7018 /* We're in a DWO/DWP file, and we're using .gdb_index.
7019 These cases require special processing. */
7020 if (get_dwp_file (dwarf2_per_objfile) == NULL)
7021 return lookup_dwo_signatured_type (cu, sig);
7023 return lookup_dwp_signatured_type (cu, sig);
7027 struct signatured_type find_entry, *entry;
7029 if (dwarf2_per_objfile->signatured_types == NULL)
7031 find_entry.signature = sig;
7032 entry = ((struct signatured_type *)
7033 htab_find (dwarf2_per_objfile->signatured_types, &find_entry));
7038 /* Low level DIE reading support. */
7040 /* Initialize a die_reader_specs struct from a dwarf2_cu struct. */
7043 init_cu_die_reader (struct die_reader_specs *reader,
7044 struct dwarf2_cu *cu,
7045 struct dwarf2_section_info *section,
7046 struct dwo_file *dwo_file,
7047 struct abbrev_table *abbrev_table)
7049 gdb_assert (section->readin && section->buffer != NULL);
7050 reader->abfd = get_section_bfd_owner (section);
7052 reader->dwo_file = dwo_file;
7053 reader->die_section = section;
7054 reader->buffer = section->buffer;
7055 reader->buffer_end = section->buffer + section->size;
7056 reader->comp_dir = NULL;
7057 reader->abbrev_table = abbrev_table;
7060 /* Subroutine of init_cutu_and_read_dies to simplify it.
7061 Read in the rest of a CU/TU top level DIE from DWO_UNIT.
7062 There's just a lot of work to do, and init_cutu_and_read_dies is big enough
7065 STUB_COMP_UNIT_DIE is for the stub DIE, we copy over certain attributes
7066 from it to the DIE in the DWO. If NULL we are skipping the stub.
7067 STUB_COMP_DIR is similar to STUB_COMP_UNIT_DIE: When reading a TU directly
7068 from the DWO file, bypassing the stub, it contains the DW_AT_comp_dir
7069 attribute of the referencing CU. At most one of STUB_COMP_UNIT_DIE and
7070 STUB_COMP_DIR may be non-NULL.
7071 *RESULT_READER,*RESULT_INFO_PTR,*RESULT_COMP_UNIT_DIE,*RESULT_HAS_CHILDREN
7072 are filled in with the info of the DIE from the DWO file.
7073 *RESULT_DWO_ABBREV_TABLE will be filled in with the abbrev table allocated
7074 from the dwo. Since *RESULT_READER references this abbrev table, it must be
7075 kept around for at least as long as *RESULT_READER.
7077 The result is non-zero if a valid (non-dummy) DIE was found. */
7080 read_cutu_die_from_dwo (struct dwarf2_per_cu_data *this_cu,
7081 struct dwo_unit *dwo_unit,
7082 struct die_info *stub_comp_unit_die,
7083 const char *stub_comp_dir,
7084 struct die_reader_specs *result_reader,
7085 const gdb_byte **result_info_ptr,
7086 struct die_info **result_comp_unit_die,
7087 int *result_has_children,
7088 abbrev_table_up *result_dwo_abbrev_table)
7090 struct dwarf2_per_objfile *dwarf2_per_objfile = this_cu->dwarf2_per_objfile;
7091 struct objfile *objfile = dwarf2_per_objfile->objfile;
7092 struct dwarf2_cu *cu = this_cu->cu;
7094 const gdb_byte *begin_info_ptr, *info_ptr;
7095 struct attribute *comp_dir, *stmt_list, *low_pc, *high_pc, *ranges;
7096 int i,num_extra_attrs;
7097 struct dwarf2_section_info *dwo_abbrev_section;
7098 struct attribute *attr;
7099 struct die_info *comp_unit_die;
7101 /* At most one of these may be provided. */
7102 gdb_assert ((stub_comp_unit_die != NULL) + (stub_comp_dir != NULL) <= 1);
7104 /* These attributes aren't processed until later:
7105 DW_AT_stmt_list, DW_AT_low_pc, DW_AT_high_pc, DW_AT_ranges.
7106 DW_AT_comp_dir is used now, to find the DWO file, but it is also
7107 referenced later. However, these attributes are found in the stub
7108 which we won't have later. In order to not impose this complication
7109 on the rest of the code, we read them here and copy them to the
7118 if (stub_comp_unit_die != NULL)
7120 /* For TUs in DWO files, the DW_AT_stmt_list attribute lives in the
7122 if (! this_cu->is_debug_types)
7123 stmt_list = dwarf2_attr (stub_comp_unit_die, DW_AT_stmt_list, cu);
7124 low_pc = dwarf2_attr (stub_comp_unit_die, DW_AT_low_pc, cu);
7125 high_pc = dwarf2_attr (stub_comp_unit_die, DW_AT_high_pc, cu);
7126 ranges = dwarf2_attr (stub_comp_unit_die, DW_AT_ranges, cu);
7127 comp_dir = dwarf2_attr (stub_comp_unit_die, DW_AT_comp_dir, cu);
7129 /* There should be a DW_AT_addr_base attribute here (if needed).
7130 We need the value before we can process DW_FORM_GNU_addr_index. */
7132 attr = dwarf2_attr (stub_comp_unit_die, DW_AT_GNU_addr_base, cu);
7134 cu->addr_base = DW_UNSND (attr);
7136 /* There should be a DW_AT_ranges_base attribute here (if needed).
7137 We need the value before we can process DW_AT_ranges. */
7138 cu->ranges_base = 0;
7139 attr = dwarf2_attr (stub_comp_unit_die, DW_AT_GNU_ranges_base, cu);
7141 cu->ranges_base = DW_UNSND (attr);
7143 else if (stub_comp_dir != NULL)
7145 /* Reconstruct the comp_dir attribute to simplify the code below. */
7146 comp_dir = XOBNEW (&cu->comp_unit_obstack, struct attribute);
7147 comp_dir->name = DW_AT_comp_dir;
7148 comp_dir->form = DW_FORM_string;
7149 DW_STRING_IS_CANONICAL (comp_dir) = 0;
7150 DW_STRING (comp_dir) = stub_comp_dir;
7153 /* Set up for reading the DWO CU/TU. */
7154 cu->dwo_unit = dwo_unit;
7155 dwarf2_section_info *section = dwo_unit->section;
7156 dwarf2_read_section (objfile, section);
7157 abfd = get_section_bfd_owner (section);
7158 begin_info_ptr = info_ptr = (section->buffer
7159 + to_underlying (dwo_unit->sect_off));
7160 dwo_abbrev_section = &dwo_unit->dwo_file->sections.abbrev;
7162 if (this_cu->is_debug_types)
7164 struct signatured_type *sig_type = (struct signatured_type *) this_cu;
7166 info_ptr = read_and_check_comp_unit_head (dwarf2_per_objfile,
7167 &cu->header, section,
7169 info_ptr, rcuh_kind::TYPE);
7170 /* This is not an assert because it can be caused by bad debug info. */
7171 if (sig_type->signature != cu->header.signature)
7173 error (_("Dwarf Error: signature mismatch %s vs %s while reading"
7174 " TU at offset %s [in module %s]"),
7175 hex_string (sig_type->signature),
7176 hex_string (cu->header.signature),
7177 sect_offset_str (dwo_unit->sect_off),
7178 bfd_get_filename (abfd));
7180 gdb_assert (dwo_unit->sect_off == cu->header.sect_off);
7181 /* For DWOs coming from DWP files, we don't know the CU length
7182 nor the type's offset in the TU until now. */
7183 dwo_unit->length = get_cu_length (&cu->header);
7184 dwo_unit->type_offset_in_tu = cu->header.type_cu_offset_in_tu;
7186 /* Establish the type offset that can be used to lookup the type.
7187 For DWO files, we don't know it until now. */
7188 sig_type->type_offset_in_section
7189 = dwo_unit->sect_off + to_underlying (dwo_unit->type_offset_in_tu);
7193 info_ptr = read_and_check_comp_unit_head (dwarf2_per_objfile,
7194 &cu->header, section,
7196 info_ptr, rcuh_kind::COMPILE);
7197 gdb_assert (dwo_unit->sect_off == cu->header.sect_off);
7198 /* For DWOs coming from DWP files, we don't know the CU length
7200 dwo_unit->length = get_cu_length (&cu->header);
7203 *result_dwo_abbrev_table
7204 = abbrev_table_read_table (dwarf2_per_objfile, dwo_abbrev_section,
7205 cu->header.abbrev_sect_off);
7206 init_cu_die_reader (result_reader, cu, section, dwo_unit->dwo_file,
7207 result_dwo_abbrev_table->get ());
7209 /* Read in the die, but leave space to copy over the attributes
7210 from the stub. This has the benefit of simplifying the rest of
7211 the code - all the work to maintain the illusion of a single
7212 DW_TAG_{compile,type}_unit DIE is done here. */
7213 num_extra_attrs = ((stmt_list != NULL)
7217 + (comp_dir != NULL));
7218 info_ptr = read_full_die_1 (result_reader, result_comp_unit_die, info_ptr,
7219 result_has_children, num_extra_attrs);
7221 /* Copy over the attributes from the stub to the DIE we just read in. */
7222 comp_unit_die = *result_comp_unit_die;
7223 i = comp_unit_die->num_attrs;
7224 if (stmt_list != NULL)
7225 comp_unit_die->attrs[i++] = *stmt_list;
7227 comp_unit_die->attrs[i++] = *low_pc;
7228 if (high_pc != NULL)
7229 comp_unit_die->attrs[i++] = *high_pc;
7231 comp_unit_die->attrs[i++] = *ranges;
7232 if (comp_dir != NULL)
7233 comp_unit_die->attrs[i++] = *comp_dir;
7234 comp_unit_die->num_attrs += num_extra_attrs;
7236 if (dwarf_die_debug)
7238 fprintf_unfiltered (gdb_stdlog,
7239 "Read die from %s@0x%x of %s:\n",
7240 get_section_name (section),
7241 (unsigned) (begin_info_ptr - section->buffer),
7242 bfd_get_filename (abfd));
7243 dump_die (comp_unit_die, dwarf_die_debug);
7246 /* Save the comp_dir attribute. If there is no DWP file then we'll read
7247 TUs by skipping the stub and going directly to the entry in the DWO file.
7248 However, skipping the stub means we won't get DW_AT_comp_dir, so we have
7249 to get it via circuitous means. Blech. */
7250 if (comp_dir != NULL)
7251 result_reader->comp_dir = DW_STRING (comp_dir);
7253 /* Skip dummy compilation units. */
7254 if (info_ptr >= begin_info_ptr + dwo_unit->length
7255 || peek_abbrev_code (abfd, info_ptr) == 0)
7258 *result_info_ptr = info_ptr;
7262 /* Subroutine of init_cutu_and_read_dies to simplify it.
7263 Look up the DWO unit specified by COMP_UNIT_DIE of THIS_CU.
7264 Returns NULL if the specified DWO unit cannot be found. */
7266 static struct dwo_unit *
7267 lookup_dwo_unit (struct dwarf2_per_cu_data *this_cu,
7268 struct die_info *comp_unit_die)
7270 struct dwarf2_cu *cu = this_cu->cu;
7272 struct dwo_unit *dwo_unit;
7273 const char *comp_dir, *dwo_name;
7275 gdb_assert (cu != NULL);
7277 /* Yeah, we look dwo_name up again, but it simplifies the code. */
7278 dwo_name = dwarf2_string_attr (comp_unit_die, DW_AT_GNU_dwo_name, cu);
7279 comp_dir = dwarf2_string_attr (comp_unit_die, DW_AT_comp_dir, cu);
7281 if (this_cu->is_debug_types)
7283 struct signatured_type *sig_type;
7285 /* Since this_cu is the first member of struct signatured_type,
7286 we can go from a pointer to one to a pointer to the other. */
7287 sig_type = (struct signatured_type *) this_cu;
7288 signature = sig_type->signature;
7289 dwo_unit = lookup_dwo_type_unit (sig_type, dwo_name, comp_dir);
7293 struct attribute *attr;
7295 attr = dwarf2_attr (comp_unit_die, DW_AT_GNU_dwo_id, cu);
7297 error (_("Dwarf Error: missing dwo_id for dwo_name %s"
7299 dwo_name, objfile_name (this_cu->dwarf2_per_objfile->objfile));
7300 signature = DW_UNSND (attr);
7301 dwo_unit = lookup_dwo_comp_unit (this_cu, dwo_name, comp_dir,
7308 /* Subroutine of init_cutu_and_read_dies to simplify it.
7309 See it for a description of the parameters.
7310 Read a TU directly from a DWO file, bypassing the stub. */
7313 init_tu_and_read_dwo_dies (struct dwarf2_per_cu_data *this_cu,
7314 int use_existing_cu, int keep,
7315 die_reader_func_ftype *die_reader_func,
7318 std::unique_ptr<dwarf2_cu> new_cu;
7319 struct signatured_type *sig_type;
7320 struct die_reader_specs reader;
7321 const gdb_byte *info_ptr;
7322 struct die_info *comp_unit_die;
7324 struct dwarf2_per_objfile *dwarf2_per_objfile = this_cu->dwarf2_per_objfile;
7326 /* Verify we can do the following downcast, and that we have the
7328 gdb_assert (this_cu->is_debug_types && this_cu->reading_dwo_directly);
7329 sig_type = (struct signatured_type *) this_cu;
7330 gdb_assert (sig_type->dwo_unit != NULL);
7332 if (use_existing_cu && this_cu->cu != NULL)
7334 gdb_assert (this_cu->cu->dwo_unit == sig_type->dwo_unit);
7335 /* There's no need to do the rereading_dwo_cu handling that
7336 init_cutu_and_read_dies does since we don't read the stub. */
7340 /* If !use_existing_cu, this_cu->cu must be NULL. */
7341 gdb_assert (this_cu->cu == NULL);
7342 new_cu.reset (new dwarf2_cu (this_cu));
7345 /* A future optimization, if needed, would be to use an existing
7346 abbrev table. When reading DWOs with skeletonless TUs, all the TUs
7347 could share abbrev tables. */
7349 /* The abbreviation table used by READER, this must live at least as long as
7351 abbrev_table_up dwo_abbrev_table;
7353 if (read_cutu_die_from_dwo (this_cu, sig_type->dwo_unit,
7354 NULL /* stub_comp_unit_die */,
7355 sig_type->dwo_unit->dwo_file->comp_dir,
7357 &comp_unit_die, &has_children,
7358 &dwo_abbrev_table) == 0)
7364 /* All the "real" work is done here. */
7365 die_reader_func (&reader, info_ptr, comp_unit_die, has_children, data);
7367 /* This duplicates the code in init_cutu_and_read_dies,
7368 but the alternative is making the latter more complex.
7369 This function is only for the special case of using DWO files directly:
7370 no point in overly complicating the general case just to handle this. */
7371 if (new_cu != NULL && keep)
7373 /* Link this CU into read_in_chain. */
7374 this_cu->cu->read_in_chain = dwarf2_per_objfile->read_in_chain;
7375 dwarf2_per_objfile->read_in_chain = this_cu;
7376 /* The chain owns it now. */
7381 /* Initialize a CU (or TU) and read its DIEs.
7382 If the CU defers to a DWO file, read the DWO file as well.
7384 ABBREV_TABLE, if non-NULL, is the abbreviation table to use.
7385 Otherwise the table specified in the comp unit header is read in and used.
7386 This is an optimization for when we already have the abbrev table.
7388 If USE_EXISTING_CU is non-zero, and THIS_CU->cu is non-NULL, then use it.
7389 Otherwise, a new CU is allocated with xmalloc.
7391 If KEEP is non-zero, then if we allocated a dwarf2_cu we add it to
7392 read_in_chain. Otherwise the dwarf2_cu data is freed at the end.
7394 WARNING: If THIS_CU is a "dummy CU" (used as filler by the incremental
7395 linker) then DIE_READER_FUNC will not get called. */
7398 init_cutu_and_read_dies (struct dwarf2_per_cu_data *this_cu,
7399 struct abbrev_table *abbrev_table,
7400 int use_existing_cu, int keep,
7402 die_reader_func_ftype *die_reader_func,
7405 struct dwarf2_per_objfile *dwarf2_per_objfile = this_cu->dwarf2_per_objfile;
7406 struct objfile *objfile = dwarf2_per_objfile->objfile;
7407 struct dwarf2_section_info *section = this_cu->section;
7408 bfd *abfd = get_section_bfd_owner (section);
7409 struct dwarf2_cu *cu;
7410 const gdb_byte *begin_info_ptr, *info_ptr;
7411 struct die_reader_specs reader;
7412 struct die_info *comp_unit_die;
7414 struct attribute *attr;
7415 struct signatured_type *sig_type = NULL;
7416 struct dwarf2_section_info *abbrev_section;
7417 /* Non-zero if CU currently points to a DWO file and we need to
7418 reread it. When this happens we need to reread the skeleton die
7419 before we can reread the DWO file (this only applies to CUs, not TUs). */
7420 int rereading_dwo_cu = 0;
7422 if (dwarf_die_debug)
7423 fprintf_unfiltered (gdb_stdlog, "Reading %s unit at offset %s\n",
7424 this_cu->is_debug_types ? "type" : "comp",
7425 sect_offset_str (this_cu->sect_off));
7427 if (use_existing_cu)
7430 /* If we're reading a TU directly from a DWO file, including a virtual DWO
7431 file (instead of going through the stub), short-circuit all of this. */
7432 if (this_cu->reading_dwo_directly)
7434 /* Narrow down the scope of possibilities to have to understand. */
7435 gdb_assert (this_cu->is_debug_types);
7436 gdb_assert (abbrev_table == NULL);
7437 init_tu_and_read_dwo_dies (this_cu, use_existing_cu, keep,
7438 die_reader_func, data);
7442 /* This is cheap if the section is already read in. */
7443 dwarf2_read_section (objfile, section);
7445 begin_info_ptr = info_ptr = section->buffer + to_underlying (this_cu->sect_off);
7447 abbrev_section = get_abbrev_section_for_cu (this_cu);
7449 std::unique_ptr<dwarf2_cu> new_cu;
7450 if (use_existing_cu && this_cu->cu != NULL)
7453 /* If this CU is from a DWO file we need to start over, we need to
7454 refetch the attributes from the skeleton CU.
7455 This could be optimized by retrieving those attributes from when we
7456 were here the first time: the previous comp_unit_die was stored in
7457 comp_unit_obstack. But there's no data yet that we need this
7459 if (cu->dwo_unit != NULL)
7460 rereading_dwo_cu = 1;
7464 /* If !use_existing_cu, this_cu->cu must be NULL. */
7465 gdb_assert (this_cu->cu == NULL);
7466 new_cu.reset (new dwarf2_cu (this_cu));
7470 /* Get the header. */
7471 if (to_underlying (cu->header.first_die_cu_offset) != 0 && !rereading_dwo_cu)
7473 /* We already have the header, there's no need to read it in again. */
7474 info_ptr += to_underlying (cu->header.first_die_cu_offset);
7478 if (this_cu->is_debug_types)
7480 info_ptr = read_and_check_comp_unit_head (dwarf2_per_objfile,
7481 &cu->header, section,
7482 abbrev_section, info_ptr,
7485 /* Since per_cu is the first member of struct signatured_type,
7486 we can go from a pointer to one to a pointer to the other. */
7487 sig_type = (struct signatured_type *) this_cu;
7488 gdb_assert (sig_type->signature == cu->header.signature);
7489 gdb_assert (sig_type->type_offset_in_tu
7490 == cu->header.type_cu_offset_in_tu);
7491 gdb_assert (this_cu->sect_off == cu->header.sect_off);
7493 /* LENGTH has not been set yet for type units if we're
7494 using .gdb_index. */
7495 this_cu->length = get_cu_length (&cu->header);
7497 /* Establish the type offset that can be used to lookup the type. */
7498 sig_type->type_offset_in_section =
7499 this_cu->sect_off + to_underlying (sig_type->type_offset_in_tu);
7501 this_cu->dwarf_version = cu->header.version;
7505 info_ptr = read_and_check_comp_unit_head (dwarf2_per_objfile,
7506 &cu->header, section,
7509 rcuh_kind::COMPILE);
7511 gdb_assert (this_cu->sect_off == cu->header.sect_off);
7512 gdb_assert (this_cu->length == get_cu_length (&cu->header));
7513 this_cu->dwarf_version = cu->header.version;
7517 /* Skip dummy compilation units. */
7518 if (info_ptr >= begin_info_ptr + this_cu->length
7519 || peek_abbrev_code (abfd, info_ptr) == 0)
7522 /* If we don't have them yet, read the abbrevs for this compilation unit.
7523 And if we need to read them now, make sure they're freed when we're
7524 done (own the table through ABBREV_TABLE_HOLDER). */
7525 abbrev_table_up abbrev_table_holder;
7526 if (abbrev_table != NULL)
7527 gdb_assert (cu->header.abbrev_sect_off == abbrev_table->sect_off);
7531 = abbrev_table_read_table (dwarf2_per_objfile, abbrev_section,
7532 cu->header.abbrev_sect_off);
7533 abbrev_table = abbrev_table_holder.get ();
7536 /* Read the top level CU/TU die. */
7537 init_cu_die_reader (&reader, cu, section, NULL, abbrev_table);
7538 info_ptr = read_full_die (&reader, &comp_unit_die, info_ptr, &has_children);
7540 if (skip_partial && comp_unit_die->tag == DW_TAG_partial_unit)
7543 /* If we are in a DWO stub, process it and then read in the "real" CU/TU
7544 from the DWO file. read_cutu_die_from_dwo will allocate the abbreviation
7545 table from the DWO file and pass the ownership over to us. It will be
7546 referenced from READER, so we must make sure to free it after we're done
7549 Note that if USE_EXISTING_OK != 0, and THIS_CU->cu already contains a
7550 DWO CU, that this test will fail (the attribute will not be present). */
7551 attr = dwarf2_attr (comp_unit_die, DW_AT_GNU_dwo_name, cu);
7552 abbrev_table_up dwo_abbrev_table;
7555 struct dwo_unit *dwo_unit;
7556 struct die_info *dwo_comp_unit_die;
7560 complaint (_("compilation unit with DW_AT_GNU_dwo_name"
7561 " has children (offset %s) [in module %s]"),
7562 sect_offset_str (this_cu->sect_off),
7563 bfd_get_filename (abfd));
7565 dwo_unit = lookup_dwo_unit (this_cu, comp_unit_die);
7566 if (dwo_unit != NULL)
7568 if (read_cutu_die_from_dwo (this_cu, dwo_unit,
7569 comp_unit_die, NULL,
7571 &dwo_comp_unit_die, &has_children,
7572 &dwo_abbrev_table) == 0)
7577 comp_unit_die = dwo_comp_unit_die;
7581 /* Yikes, we couldn't find the rest of the DIE, we only have
7582 the stub. A complaint has already been logged. There's
7583 not much more we can do except pass on the stub DIE to
7584 die_reader_func. We don't want to throw an error on bad
7589 /* All of the above is setup for this call. Yikes. */
7590 die_reader_func (&reader, info_ptr, comp_unit_die, has_children, data);
7592 /* Done, clean up. */
7593 if (new_cu != NULL && keep)
7595 /* Link this CU into read_in_chain. */
7596 this_cu->cu->read_in_chain = dwarf2_per_objfile->read_in_chain;
7597 dwarf2_per_objfile->read_in_chain = this_cu;
7598 /* The chain owns it now. */
7603 /* Read CU/TU THIS_CU but do not follow DW_AT_GNU_dwo_name if present.
7604 DWO_FILE, if non-NULL, is the DWO file to read (the caller is assumed
7605 to have already done the lookup to find the DWO file).
7607 The caller is required to fill in THIS_CU->section, THIS_CU->offset, and
7608 THIS_CU->is_debug_types, but nothing else.
7610 We fill in THIS_CU->length.
7612 WARNING: If THIS_CU is a "dummy CU" (used as filler by the incremental
7613 linker) then DIE_READER_FUNC will not get called.
7615 THIS_CU->cu is always freed when done.
7616 This is done in order to not leave THIS_CU->cu in a state where we have
7617 to care whether it refers to the "main" CU or the DWO CU. */
7620 init_cutu_and_read_dies_no_follow (struct dwarf2_per_cu_data *this_cu,
7621 struct dwo_file *dwo_file,
7622 die_reader_func_ftype *die_reader_func,
7625 struct dwarf2_per_objfile *dwarf2_per_objfile = this_cu->dwarf2_per_objfile;
7626 struct objfile *objfile = dwarf2_per_objfile->objfile;
7627 struct dwarf2_section_info *section = this_cu->section;
7628 bfd *abfd = get_section_bfd_owner (section);
7629 struct dwarf2_section_info *abbrev_section;
7630 const gdb_byte *begin_info_ptr, *info_ptr;
7631 struct die_reader_specs reader;
7632 struct die_info *comp_unit_die;
7635 if (dwarf_die_debug)
7636 fprintf_unfiltered (gdb_stdlog, "Reading %s unit at offset %s\n",
7637 this_cu->is_debug_types ? "type" : "comp",
7638 sect_offset_str (this_cu->sect_off));
7640 gdb_assert (this_cu->cu == NULL);
7642 abbrev_section = (dwo_file != NULL
7643 ? &dwo_file->sections.abbrev
7644 : get_abbrev_section_for_cu (this_cu));
7646 /* This is cheap if the section is already read in. */
7647 dwarf2_read_section (objfile, section);
7649 struct dwarf2_cu cu (this_cu);
7651 begin_info_ptr = info_ptr = section->buffer + to_underlying (this_cu->sect_off);
7652 info_ptr = read_and_check_comp_unit_head (dwarf2_per_objfile,
7653 &cu.header, section,
7654 abbrev_section, info_ptr,
7655 (this_cu->is_debug_types
7657 : rcuh_kind::COMPILE));
7659 this_cu->length = get_cu_length (&cu.header);
7661 /* Skip dummy compilation units. */
7662 if (info_ptr >= begin_info_ptr + this_cu->length
7663 || peek_abbrev_code (abfd, info_ptr) == 0)
7666 abbrev_table_up abbrev_table
7667 = abbrev_table_read_table (dwarf2_per_objfile, abbrev_section,
7668 cu.header.abbrev_sect_off);
7670 init_cu_die_reader (&reader, &cu, section, dwo_file, abbrev_table.get ());
7671 info_ptr = read_full_die (&reader, &comp_unit_die, info_ptr, &has_children);
7673 die_reader_func (&reader, info_ptr, comp_unit_die, has_children, data);
7676 /* Read a CU/TU, except that this does not look for DW_AT_GNU_dwo_name and
7677 does not lookup the specified DWO file.
7678 This cannot be used to read DWO files.
7680 THIS_CU->cu is always freed when done.
7681 This is done in order to not leave THIS_CU->cu in a state where we have
7682 to care whether it refers to the "main" CU or the DWO CU.
7683 We can revisit this if the data shows there's a performance issue. */
7686 init_cutu_and_read_dies_simple (struct dwarf2_per_cu_data *this_cu,
7687 die_reader_func_ftype *die_reader_func,
7690 init_cutu_and_read_dies_no_follow (this_cu, NULL, die_reader_func, data);
7693 /* Type Unit Groups.
7695 Type Unit Groups are a way to collapse the set of all TUs (type units) into
7696 a more manageable set. The grouping is done by DW_AT_stmt_list entry
7697 so that all types coming from the same compilation (.o file) are grouped
7698 together. A future step could be to put the types in the same symtab as
7699 the CU the types ultimately came from. */
7702 hash_type_unit_group (const void *item)
7704 const struct type_unit_group *tu_group
7705 = (const struct type_unit_group *) item;
7707 return hash_stmt_list_entry (&tu_group->hash);
7711 eq_type_unit_group (const void *item_lhs, const void *item_rhs)
7713 const struct type_unit_group *lhs = (const struct type_unit_group *) item_lhs;
7714 const struct type_unit_group *rhs = (const struct type_unit_group *) item_rhs;
7716 return eq_stmt_list_entry (&lhs->hash, &rhs->hash);
7719 /* Allocate a hash table for type unit groups. */
7722 allocate_type_unit_groups_table (struct objfile *objfile)
7724 return htab_create_alloc_ex (3,
7725 hash_type_unit_group,
7728 &objfile->objfile_obstack,
7729 hashtab_obstack_allocate,
7730 dummy_obstack_deallocate);
7733 /* Type units that don't have DW_AT_stmt_list are grouped into their own
7734 partial symtabs. We combine several TUs per psymtab to not let the size
7735 of any one psymtab grow too big. */
7736 #define NO_STMT_LIST_TYPE_UNIT_PSYMTAB (1 << 31)
7737 #define NO_STMT_LIST_TYPE_UNIT_PSYMTAB_SIZE 10
7739 /* Helper routine for get_type_unit_group.
7740 Create the type_unit_group object used to hold one or more TUs. */
7742 static struct type_unit_group *
7743 create_type_unit_group (struct dwarf2_cu *cu, sect_offset line_offset_struct)
7745 struct dwarf2_per_objfile *dwarf2_per_objfile
7746 = cu->per_cu->dwarf2_per_objfile;
7747 struct objfile *objfile = dwarf2_per_objfile->objfile;
7748 struct dwarf2_per_cu_data *per_cu;
7749 struct type_unit_group *tu_group;
7751 tu_group = OBSTACK_ZALLOC (&objfile->objfile_obstack,
7752 struct type_unit_group);
7753 per_cu = &tu_group->per_cu;
7754 per_cu->dwarf2_per_objfile = dwarf2_per_objfile;
7756 if (dwarf2_per_objfile->using_index)
7758 per_cu->v.quick = OBSTACK_ZALLOC (&objfile->objfile_obstack,
7759 struct dwarf2_per_cu_quick_data);
7763 unsigned int line_offset = to_underlying (line_offset_struct);
7764 struct partial_symtab *pst;
7767 /* Give the symtab a useful name for debug purposes. */
7768 if ((line_offset & NO_STMT_LIST_TYPE_UNIT_PSYMTAB) != 0)
7769 name = xstrprintf ("<type_units_%d>",
7770 (line_offset & ~NO_STMT_LIST_TYPE_UNIT_PSYMTAB));
7772 name = xstrprintf ("<type_units_at_0x%x>", line_offset);
7774 pst = create_partial_symtab (per_cu, name);
7780 tu_group->hash.dwo_unit = cu->dwo_unit;
7781 tu_group->hash.line_sect_off = line_offset_struct;
7786 /* Look up the type_unit_group for type unit CU, and create it if necessary.
7787 STMT_LIST is a DW_AT_stmt_list attribute. */
7789 static struct type_unit_group *
7790 get_type_unit_group (struct dwarf2_cu *cu, const struct attribute *stmt_list)
7792 struct dwarf2_per_objfile *dwarf2_per_objfile
7793 = cu->per_cu->dwarf2_per_objfile;
7794 struct tu_stats *tu_stats = &dwarf2_per_objfile->tu_stats;
7795 struct type_unit_group *tu_group;
7797 unsigned int line_offset;
7798 struct type_unit_group type_unit_group_for_lookup;
7800 if (dwarf2_per_objfile->type_unit_groups == NULL)
7802 dwarf2_per_objfile->type_unit_groups =
7803 allocate_type_unit_groups_table (dwarf2_per_objfile->objfile);
7806 /* Do we need to create a new group, or can we use an existing one? */
7810 line_offset = DW_UNSND (stmt_list);
7811 ++tu_stats->nr_symtab_sharers;
7815 /* Ugh, no stmt_list. Rare, but we have to handle it.
7816 We can do various things here like create one group per TU or
7817 spread them over multiple groups to split up the expansion work.
7818 To avoid worst case scenarios (too many groups or too large groups)
7819 we, umm, group them in bunches. */
7820 line_offset = (NO_STMT_LIST_TYPE_UNIT_PSYMTAB
7821 | (tu_stats->nr_stmt_less_type_units
7822 / NO_STMT_LIST_TYPE_UNIT_PSYMTAB_SIZE));
7823 ++tu_stats->nr_stmt_less_type_units;
7826 type_unit_group_for_lookup.hash.dwo_unit = cu->dwo_unit;
7827 type_unit_group_for_lookup.hash.line_sect_off = (sect_offset) line_offset;
7828 slot = htab_find_slot (dwarf2_per_objfile->type_unit_groups,
7829 &type_unit_group_for_lookup, INSERT);
7832 tu_group = (struct type_unit_group *) *slot;
7833 gdb_assert (tu_group != NULL);
7837 sect_offset line_offset_struct = (sect_offset) line_offset;
7838 tu_group = create_type_unit_group (cu, line_offset_struct);
7840 ++tu_stats->nr_symtabs;
7846 /* Partial symbol tables. */
7848 /* Create a psymtab named NAME and assign it to PER_CU.
7850 The caller must fill in the following details:
7851 dirname, textlow, texthigh. */
7853 static struct partial_symtab *
7854 create_partial_symtab (struct dwarf2_per_cu_data *per_cu, const char *name)
7856 struct objfile *objfile = per_cu->dwarf2_per_objfile->objfile;
7857 struct partial_symtab *pst;
7859 pst = start_psymtab_common (objfile, name, 0,
7860 objfile->global_psymbols,
7861 objfile->static_psymbols);
7863 pst->psymtabs_addrmap_supported = 1;
7865 /* This is the glue that links PST into GDB's symbol API. */
7866 pst->read_symtab_private = per_cu;
7867 pst->read_symtab = dwarf2_read_symtab;
7868 per_cu->v.psymtab = pst;
7873 /* The DATA object passed to process_psymtab_comp_unit_reader has this
7876 struct process_psymtab_comp_unit_data
7878 /* True if we are reading a DW_TAG_partial_unit. */
7880 int want_partial_unit;
7882 /* The "pretend" language that is used if the CU doesn't declare a
7885 enum language pretend_language;
7888 /* die_reader_func for process_psymtab_comp_unit. */
7891 process_psymtab_comp_unit_reader (const struct die_reader_specs *reader,
7892 const gdb_byte *info_ptr,
7893 struct die_info *comp_unit_die,
7897 struct dwarf2_cu *cu = reader->cu;
7898 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
7899 struct gdbarch *gdbarch = get_objfile_arch (objfile);
7900 struct dwarf2_per_cu_data *per_cu = cu->per_cu;
7902 CORE_ADDR best_lowpc = 0, best_highpc = 0;
7903 struct partial_symtab *pst;
7904 enum pc_bounds_kind cu_bounds_kind;
7905 const char *filename;
7906 struct process_psymtab_comp_unit_data *info
7907 = (struct process_psymtab_comp_unit_data *) data;
7909 if (comp_unit_die->tag == DW_TAG_partial_unit && !info->want_partial_unit)
7912 gdb_assert (! per_cu->is_debug_types);
7914 prepare_one_comp_unit (cu, comp_unit_die, info->pretend_language);
7916 /* Allocate a new partial symbol table structure. */
7917 filename = dwarf2_string_attr (comp_unit_die, DW_AT_name, cu);
7918 if (filename == NULL)
7921 pst = create_partial_symtab (per_cu, filename);
7923 /* This must be done before calling dwarf2_build_include_psymtabs. */
7924 pst->dirname = dwarf2_string_attr (comp_unit_die, DW_AT_comp_dir, cu);
7926 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
7928 dwarf2_find_base_address (comp_unit_die, cu);
7930 /* Possibly set the default values of LOWPC and HIGHPC from
7932 cu_bounds_kind = dwarf2_get_pc_bounds (comp_unit_die, &best_lowpc,
7933 &best_highpc, cu, pst);
7934 if (cu_bounds_kind == PC_BOUNDS_HIGH_LOW && best_lowpc < best_highpc)
7935 /* Store the contiguous range if it is not empty; it can be empty for
7936 CUs with no code. */
7937 addrmap_set_empty (objfile->psymtabs_addrmap,
7938 gdbarch_adjust_dwarf2_addr (gdbarch,
7939 best_lowpc + baseaddr),
7940 gdbarch_adjust_dwarf2_addr (gdbarch,
7941 best_highpc + baseaddr) - 1,
7944 /* Check if comp unit has_children.
7945 If so, read the rest of the partial symbols from this comp unit.
7946 If not, there's no more debug_info for this comp unit. */
7949 struct partial_die_info *first_die;
7950 CORE_ADDR lowpc, highpc;
7952 lowpc = ((CORE_ADDR) -1);
7953 highpc = ((CORE_ADDR) 0);
7955 first_die = load_partial_dies (reader, info_ptr, 1);
7957 scan_partial_symbols (first_die, &lowpc, &highpc,
7958 cu_bounds_kind <= PC_BOUNDS_INVALID, cu);
7960 /* If we didn't find a lowpc, set it to highpc to avoid
7961 complaints from `maint check'. */
7962 if (lowpc == ((CORE_ADDR) -1))
7965 /* If the compilation unit didn't have an explicit address range,
7966 then use the information extracted from its child dies. */
7967 if (cu_bounds_kind <= PC_BOUNDS_INVALID)
7970 best_highpc = highpc;
7973 pst->textlow = gdbarch_adjust_dwarf2_addr (gdbarch, best_lowpc + baseaddr);
7974 pst->texthigh = gdbarch_adjust_dwarf2_addr (gdbarch, best_highpc + baseaddr);
7976 end_psymtab_common (objfile, pst);
7978 if (!VEC_empty (dwarf2_per_cu_ptr, cu->per_cu->imported_symtabs))
7981 int len = VEC_length (dwarf2_per_cu_ptr, cu->per_cu->imported_symtabs);
7982 struct dwarf2_per_cu_data *iter;
7984 /* Fill in 'dependencies' here; we fill in 'users' in a
7986 pst->number_of_dependencies = len;
7988 XOBNEWVEC (&objfile->objfile_obstack, struct partial_symtab *, len);
7990 VEC_iterate (dwarf2_per_cu_ptr, cu->per_cu->imported_symtabs,
7993 pst->dependencies[i] = iter->v.psymtab;
7995 VEC_free (dwarf2_per_cu_ptr, cu->per_cu->imported_symtabs);
7998 /* Get the list of files included in the current compilation unit,
7999 and build a psymtab for each of them. */
8000 dwarf2_build_include_psymtabs (cu, comp_unit_die, pst);
8002 if (dwarf_read_debug)
8004 struct gdbarch *gdbarch = get_objfile_arch (objfile);
8006 fprintf_unfiltered (gdb_stdlog,
8007 "Psymtab for %s unit @%s: %s - %s"
8008 ", %d global, %d static syms\n",
8009 per_cu->is_debug_types ? "type" : "comp",
8010 sect_offset_str (per_cu->sect_off),
8011 paddress (gdbarch, pst->textlow),
8012 paddress (gdbarch, pst->texthigh),
8013 pst->n_global_syms, pst->n_static_syms);
8017 /* Subroutine of dwarf2_build_psymtabs_hard to simplify it.
8018 Process compilation unit THIS_CU for a psymtab. */
8021 process_psymtab_comp_unit (struct dwarf2_per_cu_data *this_cu,
8022 int want_partial_unit,
8023 enum language pretend_language)
8025 /* If this compilation unit was already read in, free the
8026 cached copy in order to read it in again. This is
8027 necessary because we skipped some symbols when we first
8028 read in the compilation unit (see load_partial_dies).
8029 This problem could be avoided, but the benefit is unclear. */
8030 if (this_cu->cu != NULL)
8031 free_one_cached_comp_unit (this_cu);
8033 if (this_cu->is_debug_types)
8034 init_cutu_and_read_dies (this_cu, NULL, 0, 0, false,
8035 build_type_psymtabs_reader, NULL);
8038 process_psymtab_comp_unit_data info;
8039 info.want_partial_unit = want_partial_unit;
8040 info.pretend_language = pretend_language;
8041 init_cutu_and_read_dies (this_cu, NULL, 0, 0, false,
8042 process_psymtab_comp_unit_reader, &info);
8045 /* Age out any secondary CUs. */
8046 age_cached_comp_units (this_cu->dwarf2_per_objfile);
8049 /* Reader function for build_type_psymtabs. */
8052 build_type_psymtabs_reader (const struct die_reader_specs *reader,
8053 const gdb_byte *info_ptr,
8054 struct die_info *type_unit_die,
8058 struct dwarf2_per_objfile *dwarf2_per_objfile
8059 = reader->cu->per_cu->dwarf2_per_objfile;
8060 struct objfile *objfile = dwarf2_per_objfile->objfile;
8061 struct dwarf2_cu *cu = reader->cu;
8062 struct dwarf2_per_cu_data *per_cu = cu->per_cu;
8063 struct signatured_type *sig_type;
8064 struct type_unit_group *tu_group;
8065 struct attribute *attr;
8066 struct partial_die_info *first_die;
8067 CORE_ADDR lowpc, highpc;
8068 struct partial_symtab *pst;
8070 gdb_assert (data == NULL);
8071 gdb_assert (per_cu->is_debug_types);
8072 sig_type = (struct signatured_type *) per_cu;
8077 attr = dwarf2_attr_no_follow (type_unit_die, DW_AT_stmt_list);
8078 tu_group = get_type_unit_group (cu, attr);
8080 VEC_safe_push (sig_type_ptr, tu_group->tus, sig_type);
8082 prepare_one_comp_unit (cu, type_unit_die, language_minimal);
8083 pst = create_partial_symtab (per_cu, "");
8086 first_die = load_partial_dies (reader, info_ptr, 1);
8088 lowpc = (CORE_ADDR) -1;
8089 highpc = (CORE_ADDR) 0;
8090 scan_partial_symbols (first_die, &lowpc, &highpc, 0, cu);
8092 end_psymtab_common (objfile, pst);
8095 /* Struct used to sort TUs by their abbreviation table offset. */
8097 struct tu_abbrev_offset
8099 tu_abbrev_offset (signatured_type *sig_type_, sect_offset abbrev_offset_)
8100 : sig_type (sig_type_), abbrev_offset (abbrev_offset_)
8103 signatured_type *sig_type;
8104 sect_offset abbrev_offset;
8107 /* Helper routine for build_type_psymtabs_1, passed to std::sort. */
8110 sort_tu_by_abbrev_offset (const struct tu_abbrev_offset &a,
8111 const struct tu_abbrev_offset &b)
8113 return a.abbrev_offset < b.abbrev_offset;
8116 /* Efficiently read all the type units.
8117 This does the bulk of the work for build_type_psymtabs.
8119 The efficiency is because we sort TUs by the abbrev table they use and
8120 only read each abbrev table once. In one program there are 200K TUs
8121 sharing 8K abbrev tables.
8123 The main purpose of this function is to support building the
8124 dwarf2_per_objfile->type_unit_groups table.
8125 TUs typically share the DW_AT_stmt_list of the CU they came from, so we
8126 can collapse the search space by grouping them by stmt_list.
8127 The savings can be significant, in the same program from above the 200K TUs
8128 share 8K stmt_list tables.
8130 FUNC is expected to call get_type_unit_group, which will create the
8131 struct type_unit_group if necessary and add it to
8132 dwarf2_per_objfile->type_unit_groups. */
8135 build_type_psymtabs_1 (struct dwarf2_per_objfile *dwarf2_per_objfile)
8137 struct tu_stats *tu_stats = &dwarf2_per_objfile->tu_stats;
8138 abbrev_table_up abbrev_table;
8139 sect_offset abbrev_offset;
8141 /* It's up to the caller to not call us multiple times. */
8142 gdb_assert (dwarf2_per_objfile->type_unit_groups == NULL);
8144 if (dwarf2_per_objfile->all_type_units.empty ())
8147 /* TUs typically share abbrev tables, and there can be way more TUs than
8148 abbrev tables. Sort by abbrev table to reduce the number of times we
8149 read each abbrev table in.
8150 Alternatives are to punt or to maintain a cache of abbrev tables.
8151 This is simpler and efficient enough for now.
8153 Later we group TUs by their DW_AT_stmt_list value (as this defines the
8154 symtab to use). Typically TUs with the same abbrev offset have the same
8155 stmt_list value too so in practice this should work well.
8157 The basic algorithm here is:
8159 sort TUs by abbrev table
8160 for each TU with same abbrev table:
8161 read abbrev table if first user
8162 read TU top level DIE
8163 [IWBN if DWO skeletons had DW_AT_stmt_list]
8166 if (dwarf_read_debug)
8167 fprintf_unfiltered (gdb_stdlog, "Building type unit groups ...\n");
8169 /* Sort in a separate table to maintain the order of all_type_units
8170 for .gdb_index: TU indices directly index all_type_units. */
8171 std::vector<tu_abbrev_offset> sorted_by_abbrev;
8172 sorted_by_abbrev.reserve (dwarf2_per_objfile->all_type_units.size ());
8174 for (signatured_type *sig_type : dwarf2_per_objfile->all_type_units)
8175 sorted_by_abbrev.emplace_back
8176 (sig_type, read_abbrev_offset (dwarf2_per_objfile,
8177 sig_type->per_cu.section,
8178 sig_type->per_cu.sect_off));
8180 std::sort (sorted_by_abbrev.begin (), sorted_by_abbrev.end (),
8181 sort_tu_by_abbrev_offset);
8183 abbrev_offset = (sect_offset) ~(unsigned) 0;
8185 for (const tu_abbrev_offset &tu : sorted_by_abbrev)
8187 /* Switch to the next abbrev table if necessary. */
8188 if (abbrev_table == NULL
8189 || tu.abbrev_offset != abbrev_offset)
8191 abbrev_offset = tu.abbrev_offset;
8193 abbrev_table_read_table (dwarf2_per_objfile,
8194 &dwarf2_per_objfile->abbrev,
8196 ++tu_stats->nr_uniq_abbrev_tables;
8199 init_cutu_and_read_dies (&tu.sig_type->per_cu, abbrev_table.get (),
8200 0, 0, false, build_type_psymtabs_reader, NULL);
8204 /* Print collected type unit statistics. */
8207 print_tu_stats (struct dwarf2_per_objfile *dwarf2_per_objfile)
8209 struct tu_stats *tu_stats = &dwarf2_per_objfile->tu_stats;
8211 fprintf_unfiltered (gdb_stdlog, "Type unit statistics:\n");
8212 fprintf_unfiltered (gdb_stdlog, " %zu TUs\n",
8213 dwarf2_per_objfile->all_type_units.size ());
8214 fprintf_unfiltered (gdb_stdlog, " %d uniq abbrev tables\n",
8215 tu_stats->nr_uniq_abbrev_tables);
8216 fprintf_unfiltered (gdb_stdlog, " %d symtabs from stmt_list entries\n",
8217 tu_stats->nr_symtabs);
8218 fprintf_unfiltered (gdb_stdlog, " %d symtab sharers\n",
8219 tu_stats->nr_symtab_sharers);
8220 fprintf_unfiltered (gdb_stdlog, " %d type units without a stmt_list\n",
8221 tu_stats->nr_stmt_less_type_units);
8222 fprintf_unfiltered (gdb_stdlog, " %d all_type_units reallocs\n",
8223 tu_stats->nr_all_type_units_reallocs);
8226 /* Traversal function for build_type_psymtabs. */
8229 build_type_psymtab_dependencies (void **slot, void *info)
8231 struct dwarf2_per_objfile *dwarf2_per_objfile
8232 = (struct dwarf2_per_objfile *) info;
8233 struct objfile *objfile = dwarf2_per_objfile->objfile;
8234 struct type_unit_group *tu_group = (struct type_unit_group *) *slot;
8235 struct dwarf2_per_cu_data *per_cu = &tu_group->per_cu;
8236 struct partial_symtab *pst = per_cu->v.psymtab;
8237 int len = VEC_length (sig_type_ptr, tu_group->tus);
8238 struct signatured_type *iter;
8241 gdb_assert (len > 0);
8242 gdb_assert (IS_TYPE_UNIT_GROUP (per_cu));
8244 pst->number_of_dependencies = len;
8246 XOBNEWVEC (&objfile->objfile_obstack, struct partial_symtab *, len);
8248 VEC_iterate (sig_type_ptr, tu_group->tus, i, iter);
8251 gdb_assert (iter->per_cu.is_debug_types);
8252 pst->dependencies[i] = iter->per_cu.v.psymtab;
8253 iter->type_unit_group = tu_group;
8256 VEC_free (sig_type_ptr, tu_group->tus);
8261 /* Subroutine of dwarf2_build_psymtabs_hard to simplify it.
8262 Build partial symbol tables for the .debug_types comp-units. */
8265 build_type_psymtabs (struct dwarf2_per_objfile *dwarf2_per_objfile)
8267 if (! create_all_type_units (dwarf2_per_objfile))
8270 build_type_psymtabs_1 (dwarf2_per_objfile);
8273 /* Traversal function for process_skeletonless_type_unit.
8274 Read a TU in a DWO file and build partial symbols for it. */
8277 process_skeletonless_type_unit (void **slot, void *info)
8279 struct dwo_unit *dwo_unit = (struct dwo_unit *) *slot;
8280 struct dwarf2_per_objfile *dwarf2_per_objfile
8281 = (struct dwarf2_per_objfile *) info;
8282 struct signatured_type find_entry, *entry;
8284 /* If this TU doesn't exist in the global table, add it and read it in. */
8286 if (dwarf2_per_objfile->signatured_types == NULL)
8288 dwarf2_per_objfile->signatured_types
8289 = allocate_signatured_type_table (dwarf2_per_objfile->objfile);
8292 find_entry.signature = dwo_unit->signature;
8293 slot = htab_find_slot (dwarf2_per_objfile->signatured_types, &find_entry,
8295 /* If we've already seen this type there's nothing to do. What's happening
8296 is we're doing our own version of comdat-folding here. */
8300 /* This does the job that create_all_type_units would have done for
8302 entry = add_type_unit (dwarf2_per_objfile, dwo_unit->signature, slot);
8303 fill_in_sig_entry_from_dwo_entry (dwarf2_per_objfile, entry, dwo_unit);
8306 /* This does the job that build_type_psymtabs_1 would have done. */
8307 init_cutu_and_read_dies (&entry->per_cu, NULL, 0, 0, false,
8308 build_type_psymtabs_reader, NULL);
8313 /* Traversal function for process_skeletonless_type_units. */
8316 process_dwo_file_for_skeletonless_type_units (void **slot, void *info)
8318 struct dwo_file *dwo_file = (struct dwo_file *) *slot;
8320 if (dwo_file->tus != NULL)
8322 htab_traverse_noresize (dwo_file->tus,
8323 process_skeletonless_type_unit, info);
8329 /* Scan all TUs of DWO files, verifying we've processed them.
8330 This is needed in case a TU was emitted without its skeleton.
8331 Note: This can't be done until we know what all the DWO files are. */
8334 process_skeletonless_type_units (struct dwarf2_per_objfile *dwarf2_per_objfile)
8336 /* Skeletonless TUs in DWP files without .gdb_index is not supported yet. */
8337 if (get_dwp_file (dwarf2_per_objfile) == NULL
8338 && dwarf2_per_objfile->dwo_files != NULL)
8340 htab_traverse_noresize (dwarf2_per_objfile->dwo_files,
8341 process_dwo_file_for_skeletonless_type_units,
8342 dwarf2_per_objfile);
8346 /* Compute the 'user' field for each psymtab in DWARF2_PER_OBJFILE. */
8349 set_partial_user (struct dwarf2_per_objfile *dwarf2_per_objfile)
8351 for (dwarf2_per_cu_data *per_cu : dwarf2_per_objfile->all_comp_units)
8353 struct partial_symtab *pst = per_cu->v.psymtab;
8358 for (int j = 0; j < pst->number_of_dependencies; ++j)
8360 /* Set the 'user' field only if it is not already set. */
8361 if (pst->dependencies[j]->user == NULL)
8362 pst->dependencies[j]->user = pst;
8367 /* Build the partial symbol table by doing a quick pass through the
8368 .debug_info and .debug_abbrev sections. */
8371 dwarf2_build_psymtabs_hard (struct dwarf2_per_objfile *dwarf2_per_objfile)
8373 struct objfile *objfile = dwarf2_per_objfile->objfile;
8375 if (dwarf_read_debug)
8377 fprintf_unfiltered (gdb_stdlog, "Building psymtabs of objfile %s ...\n",
8378 objfile_name (objfile));
8381 dwarf2_per_objfile->reading_partial_symbols = 1;
8383 dwarf2_read_section (objfile, &dwarf2_per_objfile->info);
8385 /* Any cached compilation units will be linked by the per-objfile
8386 read_in_chain. Make sure to free them when we're done. */
8387 free_cached_comp_units freer (dwarf2_per_objfile);
8389 build_type_psymtabs (dwarf2_per_objfile);
8391 create_all_comp_units (dwarf2_per_objfile);
8393 /* Create a temporary address map on a temporary obstack. We later
8394 copy this to the final obstack. */
8395 auto_obstack temp_obstack;
8397 scoped_restore save_psymtabs_addrmap
8398 = make_scoped_restore (&objfile->psymtabs_addrmap,
8399 addrmap_create_mutable (&temp_obstack));
8401 for (dwarf2_per_cu_data *per_cu : dwarf2_per_objfile->all_comp_units)
8402 process_psymtab_comp_unit (per_cu, 0, language_minimal);
8404 /* This has to wait until we read the CUs, we need the list of DWOs. */
8405 process_skeletonless_type_units (dwarf2_per_objfile);
8407 /* Now that all TUs have been processed we can fill in the dependencies. */
8408 if (dwarf2_per_objfile->type_unit_groups != NULL)
8410 htab_traverse_noresize (dwarf2_per_objfile->type_unit_groups,
8411 build_type_psymtab_dependencies, dwarf2_per_objfile);
8414 if (dwarf_read_debug)
8415 print_tu_stats (dwarf2_per_objfile);
8417 set_partial_user (dwarf2_per_objfile);
8419 objfile->psymtabs_addrmap = addrmap_create_fixed (objfile->psymtabs_addrmap,
8420 &objfile->objfile_obstack);
8421 /* At this point we want to keep the address map. */
8422 save_psymtabs_addrmap.release ();
8424 if (dwarf_read_debug)
8425 fprintf_unfiltered (gdb_stdlog, "Done building psymtabs of %s\n",
8426 objfile_name (objfile));
8429 /* die_reader_func for load_partial_comp_unit. */
8432 load_partial_comp_unit_reader (const struct die_reader_specs *reader,
8433 const gdb_byte *info_ptr,
8434 struct die_info *comp_unit_die,
8438 struct dwarf2_cu *cu = reader->cu;
8440 prepare_one_comp_unit (cu, comp_unit_die, language_minimal);
8442 /* Check if comp unit has_children.
8443 If so, read the rest of the partial symbols from this comp unit.
8444 If not, there's no more debug_info for this comp unit. */
8446 load_partial_dies (reader, info_ptr, 0);
8449 /* Load the partial DIEs for a secondary CU into memory.
8450 This is also used when rereading a primary CU with load_all_dies. */
8453 load_partial_comp_unit (struct dwarf2_per_cu_data *this_cu)
8455 init_cutu_and_read_dies (this_cu, NULL, 1, 1, false,
8456 load_partial_comp_unit_reader, NULL);
8460 read_comp_units_from_section (struct dwarf2_per_objfile *dwarf2_per_objfile,
8461 struct dwarf2_section_info *section,
8462 struct dwarf2_section_info *abbrev_section,
8463 unsigned int is_dwz)
8465 const gdb_byte *info_ptr;
8466 struct objfile *objfile = dwarf2_per_objfile->objfile;
8468 if (dwarf_read_debug)
8469 fprintf_unfiltered (gdb_stdlog, "Reading %s for %s\n",
8470 get_section_name (section),
8471 get_section_file_name (section));
8473 dwarf2_read_section (objfile, section);
8475 info_ptr = section->buffer;
8477 while (info_ptr < section->buffer + section->size)
8479 struct dwarf2_per_cu_data *this_cu;
8481 sect_offset sect_off = (sect_offset) (info_ptr - section->buffer);
8483 comp_unit_head cu_header;
8484 read_and_check_comp_unit_head (dwarf2_per_objfile, &cu_header, section,
8485 abbrev_section, info_ptr,
8486 rcuh_kind::COMPILE);
8488 /* Save the compilation unit for later lookup. */
8489 if (cu_header.unit_type != DW_UT_type)
8491 this_cu = XOBNEW (&objfile->objfile_obstack,
8492 struct dwarf2_per_cu_data);
8493 memset (this_cu, 0, sizeof (*this_cu));
8497 auto sig_type = XOBNEW (&objfile->objfile_obstack,
8498 struct signatured_type);
8499 memset (sig_type, 0, sizeof (*sig_type));
8500 sig_type->signature = cu_header.signature;
8501 sig_type->type_offset_in_tu = cu_header.type_cu_offset_in_tu;
8502 this_cu = &sig_type->per_cu;
8504 this_cu->is_debug_types = (cu_header.unit_type == DW_UT_type);
8505 this_cu->sect_off = sect_off;
8506 this_cu->length = cu_header.length + cu_header.initial_length_size;
8507 this_cu->is_dwz = is_dwz;
8508 this_cu->dwarf2_per_objfile = dwarf2_per_objfile;
8509 this_cu->section = section;
8511 dwarf2_per_objfile->all_comp_units.push_back (this_cu);
8513 info_ptr = info_ptr + this_cu->length;
8517 /* Create a list of all compilation units in OBJFILE.
8518 This is only done for -readnow and building partial symtabs. */
8521 create_all_comp_units (struct dwarf2_per_objfile *dwarf2_per_objfile)
8523 gdb_assert (dwarf2_per_objfile->all_comp_units.empty ());
8524 read_comp_units_from_section (dwarf2_per_objfile, &dwarf2_per_objfile->info,
8525 &dwarf2_per_objfile->abbrev, 0);
8527 dwz_file *dwz = dwarf2_get_dwz_file (dwarf2_per_objfile);
8529 read_comp_units_from_section (dwarf2_per_objfile, &dwz->info, &dwz->abbrev,
8533 /* Process all loaded DIEs for compilation unit CU, starting at
8534 FIRST_DIE. The caller should pass SET_ADDRMAP == 1 if the compilation
8535 unit DIE did not have PC info (DW_AT_low_pc and DW_AT_high_pc, or
8536 DW_AT_ranges). See the comments of add_partial_subprogram on how
8537 SET_ADDRMAP is used and how *LOWPC and *HIGHPC are updated. */
8540 scan_partial_symbols (struct partial_die_info *first_die, CORE_ADDR *lowpc,
8541 CORE_ADDR *highpc, int set_addrmap,
8542 struct dwarf2_cu *cu)
8544 struct partial_die_info *pdi;
8546 /* Now, march along the PDI's, descending into ones which have
8547 interesting children but skipping the children of the other ones,
8548 until we reach the end of the compilation unit. */
8556 /* Anonymous namespaces or modules have no name but have interesting
8557 children, so we need to look at them. Ditto for anonymous
8560 if (pdi->name != NULL || pdi->tag == DW_TAG_namespace
8561 || pdi->tag == DW_TAG_module || pdi->tag == DW_TAG_enumeration_type
8562 || pdi->tag == DW_TAG_imported_unit
8563 || pdi->tag == DW_TAG_inlined_subroutine)
8567 case DW_TAG_subprogram:
8568 case DW_TAG_inlined_subroutine:
8569 add_partial_subprogram (pdi, lowpc, highpc, set_addrmap, cu);
8571 case DW_TAG_constant:
8572 case DW_TAG_variable:
8573 case DW_TAG_typedef:
8574 case DW_TAG_union_type:
8575 if (!pdi->is_declaration)
8577 add_partial_symbol (pdi, cu);
8580 case DW_TAG_class_type:
8581 case DW_TAG_interface_type:
8582 case DW_TAG_structure_type:
8583 if (!pdi->is_declaration)
8585 add_partial_symbol (pdi, cu);
8587 if ((cu->language == language_rust
8588 || cu->language == language_cplus) && pdi->has_children)
8589 scan_partial_symbols (pdi->die_child, lowpc, highpc,
8592 case DW_TAG_enumeration_type:
8593 if (!pdi->is_declaration)
8594 add_partial_enumeration (pdi, cu);
8596 case DW_TAG_base_type:
8597 case DW_TAG_subrange_type:
8598 /* File scope base type definitions are added to the partial
8600 add_partial_symbol (pdi, cu);
8602 case DW_TAG_namespace:
8603 add_partial_namespace (pdi, lowpc, highpc, set_addrmap, cu);
8606 add_partial_module (pdi, lowpc, highpc, set_addrmap, cu);
8608 case DW_TAG_imported_unit:
8610 struct dwarf2_per_cu_data *per_cu;
8612 /* For now we don't handle imported units in type units. */
8613 if (cu->per_cu->is_debug_types)
8615 error (_("Dwarf Error: DW_TAG_imported_unit is not"
8616 " supported in type units [in module %s]"),
8617 objfile_name (cu->per_cu->dwarf2_per_objfile->objfile));
8620 per_cu = dwarf2_find_containing_comp_unit
8621 (pdi->d.sect_off, pdi->is_dwz,
8622 cu->per_cu->dwarf2_per_objfile);
8624 /* Go read the partial unit, if needed. */
8625 if (per_cu->v.psymtab == NULL)
8626 process_psymtab_comp_unit (per_cu, 1, cu->language);
8628 VEC_safe_push (dwarf2_per_cu_ptr,
8629 cu->per_cu->imported_symtabs, per_cu);
8632 case DW_TAG_imported_declaration:
8633 add_partial_symbol (pdi, cu);
8640 /* If the die has a sibling, skip to the sibling. */
8642 pdi = pdi->die_sibling;
8646 /* Functions used to compute the fully scoped name of a partial DIE.
8648 Normally, this is simple. For C++, the parent DIE's fully scoped
8649 name is concatenated with "::" and the partial DIE's name.
8650 Enumerators are an exception; they use the scope of their parent
8651 enumeration type, i.e. the name of the enumeration type is not
8652 prepended to the enumerator.
8654 There are two complexities. One is DW_AT_specification; in this
8655 case "parent" means the parent of the target of the specification,
8656 instead of the direct parent of the DIE. The other is compilers
8657 which do not emit DW_TAG_namespace; in this case we try to guess
8658 the fully qualified name of structure types from their members'
8659 linkage names. This must be done using the DIE's children rather
8660 than the children of any DW_AT_specification target. We only need
8661 to do this for structures at the top level, i.e. if the target of
8662 any DW_AT_specification (if any; otherwise the DIE itself) does not
8665 /* Compute the scope prefix associated with PDI's parent, in
8666 compilation unit CU. The result will be allocated on CU's
8667 comp_unit_obstack, or a copy of the already allocated PDI->NAME
8668 field. NULL is returned if no prefix is necessary. */
8670 partial_die_parent_scope (struct partial_die_info *pdi,
8671 struct dwarf2_cu *cu)
8673 const char *grandparent_scope;
8674 struct partial_die_info *parent, *real_pdi;
8676 /* We need to look at our parent DIE; if we have a DW_AT_specification,
8677 then this means the parent of the specification DIE. */
8680 while (real_pdi->has_specification)
8681 real_pdi = find_partial_die (real_pdi->spec_offset,
8682 real_pdi->spec_is_dwz, cu);
8684 parent = real_pdi->die_parent;
8688 if (parent->scope_set)
8689 return parent->scope;
8693 grandparent_scope = partial_die_parent_scope (parent, cu);
8695 /* GCC 4.0 and 4.1 had a bug (PR c++/28460) where they generated bogus
8696 DW_TAG_namespace DIEs with a name of "::" for the global namespace.
8697 Work around this problem here. */
8698 if (cu->language == language_cplus
8699 && parent->tag == DW_TAG_namespace
8700 && strcmp (parent->name, "::") == 0
8701 && grandparent_scope == NULL)
8703 parent->scope = NULL;
8704 parent->scope_set = 1;
8708 if (pdi->tag == DW_TAG_enumerator)
8709 /* Enumerators should not get the name of the enumeration as a prefix. */
8710 parent->scope = grandparent_scope;
8711 else if (parent->tag == DW_TAG_namespace
8712 || parent->tag == DW_TAG_module
8713 || parent->tag == DW_TAG_structure_type
8714 || parent->tag == DW_TAG_class_type
8715 || parent->tag == DW_TAG_interface_type
8716 || parent->tag == DW_TAG_union_type
8717 || parent->tag == DW_TAG_enumeration_type)
8719 if (grandparent_scope == NULL)
8720 parent->scope = parent->name;
8722 parent->scope = typename_concat (&cu->comp_unit_obstack,
8724 parent->name, 0, cu);
8728 /* FIXME drow/2004-04-01: What should we be doing with
8729 function-local names? For partial symbols, we should probably be
8731 complaint (_("unhandled containing DIE tag %d for DIE at %s"),
8732 parent->tag, sect_offset_str (pdi->sect_off));
8733 parent->scope = grandparent_scope;
8736 parent->scope_set = 1;
8737 return parent->scope;
8740 /* Return the fully scoped name associated with PDI, from compilation unit
8741 CU. The result will be allocated with malloc. */
8744 partial_die_full_name (struct partial_die_info *pdi,
8745 struct dwarf2_cu *cu)
8747 const char *parent_scope;
8749 /* If this is a template instantiation, we can not work out the
8750 template arguments from partial DIEs. So, unfortunately, we have
8751 to go through the full DIEs. At least any work we do building
8752 types here will be reused if full symbols are loaded later. */
8753 if (pdi->has_template_arguments)
8757 if (pdi->name != NULL && strchr (pdi->name, '<') == NULL)
8759 struct die_info *die;
8760 struct attribute attr;
8761 struct dwarf2_cu *ref_cu = cu;
8763 /* DW_FORM_ref_addr is using section offset. */
8764 attr.name = (enum dwarf_attribute) 0;
8765 attr.form = DW_FORM_ref_addr;
8766 attr.u.unsnd = to_underlying (pdi->sect_off);
8767 die = follow_die_ref (NULL, &attr, &ref_cu);
8769 return xstrdup (dwarf2_full_name (NULL, die, ref_cu));
8773 parent_scope = partial_die_parent_scope (pdi, cu);
8774 if (parent_scope == NULL)
8777 return typename_concat (NULL, parent_scope, pdi->name, 0, cu);
8781 add_partial_symbol (struct partial_die_info *pdi, struct dwarf2_cu *cu)
8783 struct dwarf2_per_objfile *dwarf2_per_objfile
8784 = cu->per_cu->dwarf2_per_objfile;
8785 struct objfile *objfile = dwarf2_per_objfile->objfile;
8786 struct gdbarch *gdbarch = get_objfile_arch (objfile);
8788 const char *actual_name = NULL;
8790 char *built_actual_name;
8792 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
8794 built_actual_name = partial_die_full_name (pdi, cu);
8795 if (built_actual_name != NULL)
8796 actual_name = built_actual_name;
8798 if (actual_name == NULL)
8799 actual_name = pdi->name;
8803 case DW_TAG_inlined_subroutine:
8804 case DW_TAG_subprogram:
8805 addr = gdbarch_adjust_dwarf2_addr (gdbarch, pdi->lowpc + baseaddr);
8806 if (pdi->is_external || cu->language == language_ada)
8808 /* brobecker/2007-12-26: Normally, only "external" DIEs are part
8809 of the global scope. But in Ada, we want to be able to access
8810 nested procedures globally. So all Ada subprograms are stored
8811 in the global scope. */
8812 add_psymbol_to_list (actual_name, strlen (actual_name),
8813 built_actual_name != NULL,
8814 VAR_DOMAIN, LOC_BLOCK,
8815 &objfile->global_psymbols,
8816 addr, cu->language, objfile);
8820 add_psymbol_to_list (actual_name, strlen (actual_name),
8821 built_actual_name != NULL,
8822 VAR_DOMAIN, LOC_BLOCK,
8823 &objfile->static_psymbols,
8824 addr, cu->language, objfile);
8827 if (pdi->main_subprogram && actual_name != NULL)
8828 set_objfile_main_name (objfile, actual_name, cu->language);
8830 case DW_TAG_constant:
8832 std::vector<partial_symbol *> *list;
8834 if (pdi->is_external)
8835 list = &objfile->global_psymbols;
8837 list = &objfile->static_psymbols;
8838 add_psymbol_to_list (actual_name, strlen (actual_name),
8839 built_actual_name != NULL, VAR_DOMAIN, LOC_STATIC,
8840 list, 0, cu->language, objfile);
8843 case DW_TAG_variable:
8845 addr = decode_locdesc (pdi->d.locdesc, cu);
8849 && !dwarf2_per_objfile->has_section_at_zero)
8851 /* A global or static variable may also have been stripped
8852 out by the linker if unused, in which case its address
8853 will be nullified; do not add such variables into partial
8854 symbol table then. */
8856 else if (pdi->is_external)
8859 Don't enter into the minimal symbol tables as there is
8860 a minimal symbol table entry from the ELF symbols already.
8861 Enter into partial symbol table if it has a location
8862 descriptor or a type.
8863 If the location descriptor is missing, new_symbol will create
8864 a LOC_UNRESOLVED symbol, the address of the variable will then
8865 be determined from the minimal symbol table whenever the variable
8867 The address for the partial symbol table entry is not
8868 used by GDB, but it comes in handy for debugging partial symbol
8871 if (pdi->d.locdesc || pdi->has_type)
8872 add_psymbol_to_list (actual_name, strlen (actual_name),
8873 built_actual_name != NULL,
8874 VAR_DOMAIN, LOC_STATIC,
8875 &objfile->global_psymbols,
8877 cu->language, objfile);
8881 int has_loc = pdi->d.locdesc != NULL;
8883 /* Static Variable. Skip symbols whose value we cannot know (those
8884 without location descriptors or constant values). */
8885 if (!has_loc && !pdi->has_const_value)
8887 xfree (built_actual_name);
8891 add_psymbol_to_list (actual_name, strlen (actual_name),
8892 built_actual_name != NULL,
8893 VAR_DOMAIN, LOC_STATIC,
8894 &objfile->static_psymbols,
8895 has_loc ? addr + baseaddr : (CORE_ADDR) 0,
8896 cu->language, objfile);
8899 case DW_TAG_typedef:
8900 case DW_TAG_base_type:
8901 case DW_TAG_subrange_type:
8902 add_psymbol_to_list (actual_name, strlen (actual_name),
8903 built_actual_name != NULL,
8904 VAR_DOMAIN, LOC_TYPEDEF,
8905 &objfile->static_psymbols,
8906 0, cu->language, objfile);
8908 case DW_TAG_imported_declaration:
8909 case DW_TAG_namespace:
8910 add_psymbol_to_list (actual_name, strlen (actual_name),
8911 built_actual_name != NULL,
8912 VAR_DOMAIN, LOC_TYPEDEF,
8913 &objfile->global_psymbols,
8914 0, cu->language, objfile);
8917 add_psymbol_to_list (actual_name, strlen (actual_name),
8918 built_actual_name != NULL,
8919 MODULE_DOMAIN, LOC_TYPEDEF,
8920 &objfile->global_psymbols,
8921 0, cu->language, objfile);
8923 case DW_TAG_class_type:
8924 case DW_TAG_interface_type:
8925 case DW_TAG_structure_type:
8926 case DW_TAG_union_type:
8927 case DW_TAG_enumeration_type:
8928 /* Skip external references. The DWARF standard says in the section
8929 about "Structure, Union, and Class Type Entries": "An incomplete
8930 structure, union or class type is represented by a structure,
8931 union or class entry that does not have a byte size attribute
8932 and that has a DW_AT_declaration attribute." */
8933 if (!pdi->has_byte_size && pdi->is_declaration)
8935 xfree (built_actual_name);
8939 /* NOTE: carlton/2003-10-07: See comment in new_symbol about
8940 static vs. global. */
8941 add_psymbol_to_list (actual_name, strlen (actual_name),
8942 built_actual_name != NULL,
8943 STRUCT_DOMAIN, LOC_TYPEDEF,
8944 cu->language == language_cplus
8945 ? &objfile->global_psymbols
8946 : &objfile->static_psymbols,
8947 0, cu->language, objfile);
8950 case DW_TAG_enumerator:
8951 add_psymbol_to_list (actual_name, strlen (actual_name),
8952 built_actual_name != NULL,
8953 VAR_DOMAIN, LOC_CONST,
8954 cu->language == language_cplus
8955 ? &objfile->global_psymbols
8956 : &objfile->static_psymbols,
8957 0, cu->language, objfile);
8963 xfree (built_actual_name);
8966 /* Read a partial die corresponding to a namespace; also, add a symbol
8967 corresponding to that namespace to the symbol table. NAMESPACE is
8968 the name of the enclosing namespace. */
8971 add_partial_namespace (struct partial_die_info *pdi,
8972 CORE_ADDR *lowpc, CORE_ADDR *highpc,
8973 int set_addrmap, struct dwarf2_cu *cu)
8975 /* Add a symbol for the namespace. */
8977 add_partial_symbol (pdi, cu);
8979 /* Now scan partial symbols in that namespace. */
8981 if (pdi->has_children)
8982 scan_partial_symbols (pdi->die_child, lowpc, highpc, set_addrmap, cu);
8985 /* Read a partial die corresponding to a Fortran module. */
8988 add_partial_module (struct partial_die_info *pdi, CORE_ADDR *lowpc,
8989 CORE_ADDR *highpc, int set_addrmap, struct dwarf2_cu *cu)
8991 /* Add a symbol for the namespace. */
8993 add_partial_symbol (pdi, cu);
8995 /* Now scan partial symbols in that module. */
8997 if (pdi->has_children)
8998 scan_partial_symbols (pdi->die_child, lowpc, highpc, set_addrmap, cu);
9001 /* Read a partial die corresponding to a subprogram or an inlined
9002 subprogram and create a partial symbol for that subprogram.
9003 When the CU language allows it, this routine also defines a partial
9004 symbol for each nested subprogram that this subprogram contains.
9005 If SET_ADDRMAP is true, record the covered ranges in the addrmap.
9006 Set *LOWPC and *HIGHPC to the lowest and highest PC values found in PDI.
9008 PDI may also be a lexical block, in which case we simply search
9009 recursively for subprograms defined inside that lexical block.
9010 Again, this is only performed when the CU language allows this
9011 type of definitions. */
9014 add_partial_subprogram (struct partial_die_info *pdi,
9015 CORE_ADDR *lowpc, CORE_ADDR *highpc,
9016 int set_addrmap, struct dwarf2_cu *cu)
9018 if (pdi->tag == DW_TAG_subprogram || pdi->tag == DW_TAG_inlined_subroutine)
9020 if (pdi->has_pc_info)
9022 if (pdi->lowpc < *lowpc)
9023 *lowpc = pdi->lowpc;
9024 if (pdi->highpc > *highpc)
9025 *highpc = pdi->highpc;
9028 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
9029 struct gdbarch *gdbarch = get_objfile_arch (objfile);
9034 baseaddr = ANOFFSET (objfile->section_offsets,
9035 SECT_OFF_TEXT (objfile));
9036 lowpc = gdbarch_adjust_dwarf2_addr (gdbarch,
9037 pdi->lowpc + baseaddr);
9038 highpc = gdbarch_adjust_dwarf2_addr (gdbarch,
9039 pdi->highpc + baseaddr);
9040 addrmap_set_empty (objfile->psymtabs_addrmap, lowpc, highpc - 1,
9041 cu->per_cu->v.psymtab);
9045 if (pdi->has_pc_info || (!pdi->is_external && pdi->may_be_inlined))
9047 if (!pdi->is_declaration)
9048 /* Ignore subprogram DIEs that do not have a name, they are
9049 illegal. Do not emit a complaint at this point, we will
9050 do so when we convert this psymtab into a symtab. */
9052 add_partial_symbol (pdi, cu);
9056 if (! pdi->has_children)
9059 if (cu->language == language_ada)
9061 pdi = pdi->die_child;
9065 if (pdi->tag == DW_TAG_subprogram
9066 || pdi->tag == DW_TAG_inlined_subroutine
9067 || pdi->tag == DW_TAG_lexical_block)
9068 add_partial_subprogram (pdi, lowpc, highpc, set_addrmap, cu);
9069 pdi = pdi->die_sibling;
9074 /* Read a partial die corresponding to an enumeration type. */
9077 add_partial_enumeration (struct partial_die_info *enum_pdi,
9078 struct dwarf2_cu *cu)
9080 struct partial_die_info *pdi;
9082 if (enum_pdi->name != NULL)
9083 add_partial_symbol (enum_pdi, cu);
9085 pdi = enum_pdi->die_child;
9088 if (pdi->tag != DW_TAG_enumerator || pdi->name == NULL)
9089 complaint (_("malformed enumerator DIE ignored"));
9091 add_partial_symbol (pdi, cu);
9092 pdi = pdi->die_sibling;
9096 /* Return the initial uleb128 in the die at INFO_PTR. */
9099 peek_abbrev_code (bfd *abfd, const gdb_byte *info_ptr)
9101 unsigned int bytes_read;
9103 return read_unsigned_leb128 (abfd, info_ptr, &bytes_read);
9106 /* Read the initial uleb128 in the die at INFO_PTR in compilation unit
9107 READER::CU. Use READER::ABBREV_TABLE to lookup any abbreviation.
9109 Return the corresponding abbrev, or NULL if the number is zero (indicating
9110 an empty DIE). In either case *BYTES_READ will be set to the length of
9111 the initial number. */
9113 static struct abbrev_info *
9114 peek_die_abbrev (const die_reader_specs &reader,
9115 const gdb_byte *info_ptr, unsigned int *bytes_read)
9117 dwarf2_cu *cu = reader.cu;
9118 bfd *abfd = cu->per_cu->dwarf2_per_objfile->objfile->obfd;
9119 unsigned int abbrev_number
9120 = read_unsigned_leb128 (abfd, info_ptr, bytes_read);
9122 if (abbrev_number == 0)
9125 abbrev_info *abbrev = reader.abbrev_table->lookup_abbrev (abbrev_number);
9128 error (_("Dwarf Error: Could not find abbrev number %d in %s"
9129 " at offset %s [in module %s]"),
9130 abbrev_number, cu->per_cu->is_debug_types ? "TU" : "CU",
9131 sect_offset_str (cu->header.sect_off), bfd_get_filename (abfd));
9137 /* Scan the debug information for CU starting at INFO_PTR in buffer BUFFER.
9138 Returns a pointer to the end of a series of DIEs, terminated by an empty
9139 DIE. Any children of the skipped DIEs will also be skipped. */
9141 static const gdb_byte *
9142 skip_children (const struct die_reader_specs *reader, const gdb_byte *info_ptr)
9146 unsigned int bytes_read;
9147 abbrev_info *abbrev = peek_die_abbrev (*reader, info_ptr, &bytes_read);
9150 return info_ptr + bytes_read;
9152 info_ptr = skip_one_die (reader, info_ptr + bytes_read, abbrev);
9156 /* Scan the debug information for CU starting at INFO_PTR in buffer BUFFER.
9157 INFO_PTR should point just after the initial uleb128 of a DIE, and the
9158 abbrev corresponding to that skipped uleb128 should be passed in
9159 ABBREV. Returns a pointer to this DIE's sibling, skipping any
9162 static const gdb_byte *
9163 skip_one_die (const struct die_reader_specs *reader, const gdb_byte *info_ptr,
9164 struct abbrev_info *abbrev)
9166 unsigned int bytes_read;
9167 struct attribute attr;
9168 bfd *abfd = reader->abfd;
9169 struct dwarf2_cu *cu = reader->cu;
9170 const gdb_byte *buffer = reader->buffer;
9171 const gdb_byte *buffer_end = reader->buffer_end;
9172 unsigned int form, i;
9174 for (i = 0; i < abbrev->num_attrs; i++)
9176 /* The only abbrev we care about is DW_AT_sibling. */
9177 if (abbrev->attrs[i].name == DW_AT_sibling)
9179 read_attribute (reader, &attr, &abbrev->attrs[i], info_ptr);
9180 if (attr.form == DW_FORM_ref_addr)
9181 complaint (_("ignoring absolute DW_AT_sibling"));
9184 sect_offset off = dwarf2_get_ref_die_offset (&attr);
9185 const gdb_byte *sibling_ptr = buffer + to_underlying (off);
9187 if (sibling_ptr < info_ptr)
9188 complaint (_("DW_AT_sibling points backwards"));
9189 else if (sibling_ptr > reader->buffer_end)
9190 dwarf2_section_buffer_overflow_complaint (reader->die_section);
9196 /* If it isn't DW_AT_sibling, skip this attribute. */
9197 form = abbrev->attrs[i].form;
9201 case DW_FORM_ref_addr:
9202 /* In DWARF 2, DW_FORM_ref_addr is address sized; in DWARF 3
9203 and later it is offset sized. */
9204 if (cu->header.version == 2)
9205 info_ptr += cu->header.addr_size;
9207 info_ptr += cu->header.offset_size;
9209 case DW_FORM_GNU_ref_alt:
9210 info_ptr += cu->header.offset_size;
9213 info_ptr += cu->header.addr_size;
9220 case DW_FORM_flag_present:
9221 case DW_FORM_implicit_const:
9233 case DW_FORM_ref_sig8:
9236 case DW_FORM_data16:
9239 case DW_FORM_string:
9240 read_direct_string (abfd, info_ptr, &bytes_read);
9241 info_ptr += bytes_read;
9243 case DW_FORM_sec_offset:
9245 case DW_FORM_GNU_strp_alt:
9246 info_ptr += cu->header.offset_size;
9248 case DW_FORM_exprloc:
9250 info_ptr += read_unsigned_leb128 (abfd, info_ptr, &bytes_read);
9251 info_ptr += bytes_read;
9253 case DW_FORM_block1:
9254 info_ptr += 1 + read_1_byte (abfd, info_ptr);
9256 case DW_FORM_block2:
9257 info_ptr += 2 + read_2_bytes (abfd, info_ptr);
9259 case DW_FORM_block4:
9260 info_ptr += 4 + read_4_bytes (abfd, info_ptr);
9264 case DW_FORM_ref_udata:
9265 case DW_FORM_GNU_addr_index:
9266 case DW_FORM_GNU_str_index:
9267 info_ptr = safe_skip_leb128 (info_ptr, buffer_end);
9269 case DW_FORM_indirect:
9270 form = read_unsigned_leb128 (abfd, info_ptr, &bytes_read);
9271 info_ptr += bytes_read;
9272 /* We need to continue parsing from here, so just go back to
9274 goto skip_attribute;
9277 error (_("Dwarf Error: Cannot handle %s "
9278 "in DWARF reader [in module %s]"),
9279 dwarf_form_name (form),
9280 bfd_get_filename (abfd));
9284 if (abbrev->has_children)
9285 return skip_children (reader, info_ptr);
9290 /* Locate ORIG_PDI's sibling.
9291 INFO_PTR should point to the start of the next DIE after ORIG_PDI. */
9293 static const gdb_byte *
9294 locate_pdi_sibling (const struct die_reader_specs *reader,
9295 struct partial_die_info *orig_pdi,
9296 const gdb_byte *info_ptr)
9298 /* Do we know the sibling already? */
9300 if (orig_pdi->sibling)
9301 return orig_pdi->sibling;
9303 /* Are there any children to deal with? */
9305 if (!orig_pdi->has_children)
9308 /* Skip the children the long way. */
9310 return skip_children (reader, info_ptr);
9313 /* Expand this partial symbol table into a full symbol table. SELF is
9317 dwarf2_read_symtab (struct partial_symtab *self,
9318 struct objfile *objfile)
9320 struct dwarf2_per_objfile *dwarf2_per_objfile
9321 = get_dwarf2_per_objfile (objfile);
9325 warning (_("bug: psymtab for %s is already read in."),
9332 printf_filtered (_("Reading in symbols for %s..."),
9334 gdb_flush (gdb_stdout);
9337 /* If this psymtab is constructed from a debug-only objfile, the
9338 has_section_at_zero flag will not necessarily be correct. We
9339 can get the correct value for this flag by looking at the data
9340 associated with the (presumably stripped) associated objfile. */
9341 if (objfile->separate_debug_objfile_backlink)
9343 struct dwarf2_per_objfile *dpo_backlink
9344 = get_dwarf2_per_objfile (objfile->separate_debug_objfile_backlink);
9346 dwarf2_per_objfile->has_section_at_zero
9347 = dpo_backlink->has_section_at_zero;
9350 dwarf2_per_objfile->reading_partial_symbols = 0;
9352 psymtab_to_symtab_1 (self);
9354 /* Finish up the debug error message. */
9356 printf_filtered (_("done.\n"));
9359 process_cu_includes (dwarf2_per_objfile);
9362 /* Reading in full CUs. */
9364 /* Add PER_CU to the queue. */
9367 queue_comp_unit (struct dwarf2_per_cu_data *per_cu,
9368 enum language pretend_language)
9370 struct dwarf2_queue_item *item;
9373 item = XNEW (struct dwarf2_queue_item);
9374 item->per_cu = per_cu;
9375 item->pretend_language = pretend_language;
9378 if (dwarf2_queue == NULL)
9379 dwarf2_queue = item;
9381 dwarf2_queue_tail->next = item;
9383 dwarf2_queue_tail = item;
9386 /* If PER_CU is not yet queued, add it to the queue.
9387 If DEPENDENT_CU is non-NULL, it has a reference to PER_CU so add a
9389 The result is non-zero if PER_CU was queued, otherwise the result is zero
9390 meaning either PER_CU is already queued or it is already loaded.
9392 N.B. There is an invariant here that if a CU is queued then it is loaded.
9393 The caller is required to load PER_CU if we return non-zero. */
9396 maybe_queue_comp_unit (struct dwarf2_cu *dependent_cu,
9397 struct dwarf2_per_cu_data *per_cu,
9398 enum language pretend_language)
9400 /* We may arrive here during partial symbol reading, if we need full
9401 DIEs to process an unusual case (e.g. template arguments). Do
9402 not queue PER_CU, just tell our caller to load its DIEs. */
9403 if (per_cu->dwarf2_per_objfile->reading_partial_symbols)
9405 if (per_cu->cu == NULL || per_cu->cu->dies == NULL)
9410 /* Mark the dependence relation so that we don't flush PER_CU
9412 if (dependent_cu != NULL)
9413 dwarf2_add_dependence (dependent_cu, per_cu);
9415 /* If it's already on the queue, we have nothing to do. */
9419 /* If the compilation unit is already loaded, just mark it as
9421 if (per_cu->cu != NULL)
9423 per_cu->cu->last_used = 0;
9427 /* Add it to the queue. */
9428 queue_comp_unit (per_cu, pretend_language);
9433 /* Process the queue. */
9436 process_queue (struct dwarf2_per_objfile *dwarf2_per_objfile)
9438 struct dwarf2_queue_item *item, *next_item;
9440 if (dwarf_read_debug)
9442 fprintf_unfiltered (gdb_stdlog,
9443 "Expanding one or more symtabs of objfile %s ...\n",
9444 objfile_name (dwarf2_per_objfile->objfile));
9447 /* The queue starts out with one item, but following a DIE reference
9448 may load a new CU, adding it to the end of the queue. */
9449 for (item = dwarf2_queue; item != NULL; dwarf2_queue = item = next_item)
9451 if ((dwarf2_per_objfile->using_index
9452 ? !item->per_cu->v.quick->compunit_symtab
9453 : (item->per_cu->v.psymtab && !item->per_cu->v.psymtab->readin))
9454 /* Skip dummy CUs. */
9455 && item->per_cu->cu != NULL)
9457 struct dwarf2_per_cu_data *per_cu = item->per_cu;
9458 unsigned int debug_print_threshold;
9461 if (per_cu->is_debug_types)
9463 struct signatured_type *sig_type =
9464 (struct signatured_type *) per_cu;
9466 sprintf (buf, "TU %s at offset %s",
9467 hex_string (sig_type->signature),
9468 sect_offset_str (per_cu->sect_off));
9469 /* There can be 100s of TUs.
9470 Only print them in verbose mode. */
9471 debug_print_threshold = 2;
9475 sprintf (buf, "CU at offset %s",
9476 sect_offset_str (per_cu->sect_off));
9477 debug_print_threshold = 1;
9480 if (dwarf_read_debug >= debug_print_threshold)
9481 fprintf_unfiltered (gdb_stdlog, "Expanding symtab of %s\n", buf);
9483 if (per_cu->is_debug_types)
9484 process_full_type_unit (per_cu, item->pretend_language);
9486 process_full_comp_unit (per_cu, item->pretend_language);
9488 if (dwarf_read_debug >= debug_print_threshold)
9489 fprintf_unfiltered (gdb_stdlog, "Done expanding %s\n", buf);
9492 item->per_cu->queued = 0;
9493 next_item = item->next;
9497 dwarf2_queue_tail = NULL;
9499 if (dwarf_read_debug)
9501 fprintf_unfiltered (gdb_stdlog, "Done expanding symtabs of %s.\n",
9502 objfile_name (dwarf2_per_objfile->objfile));
9506 /* Read in full symbols for PST, and anything it depends on. */
9509 psymtab_to_symtab_1 (struct partial_symtab *pst)
9511 struct dwarf2_per_cu_data *per_cu;
9517 for (i = 0; i < pst->number_of_dependencies; i++)
9518 if (!pst->dependencies[i]->readin
9519 && pst->dependencies[i]->user == NULL)
9521 /* Inform about additional files that need to be read in. */
9524 /* FIXME: i18n: Need to make this a single string. */
9525 fputs_filtered (" ", gdb_stdout);
9527 fputs_filtered ("and ", gdb_stdout);
9529 printf_filtered ("%s...", pst->dependencies[i]->filename);
9530 wrap_here (""); /* Flush output. */
9531 gdb_flush (gdb_stdout);
9533 psymtab_to_symtab_1 (pst->dependencies[i]);
9536 per_cu = (struct dwarf2_per_cu_data *) pst->read_symtab_private;
9540 /* It's an include file, no symbols to read for it.
9541 Everything is in the parent symtab. */
9546 dw2_do_instantiate_symtab (per_cu, false);
9549 /* Trivial hash function for die_info: the hash value of a DIE
9550 is its offset in .debug_info for this objfile. */
9553 die_hash (const void *item)
9555 const struct die_info *die = (const struct die_info *) item;
9557 return to_underlying (die->sect_off);
9560 /* Trivial comparison function for die_info structures: two DIEs
9561 are equal if they have the same offset. */
9564 die_eq (const void *item_lhs, const void *item_rhs)
9566 const struct die_info *die_lhs = (const struct die_info *) item_lhs;
9567 const struct die_info *die_rhs = (const struct die_info *) item_rhs;
9569 return die_lhs->sect_off == die_rhs->sect_off;
9572 /* die_reader_func for load_full_comp_unit.
9573 This is identical to read_signatured_type_reader,
9574 but is kept separate for now. */
9577 load_full_comp_unit_reader (const struct die_reader_specs *reader,
9578 const gdb_byte *info_ptr,
9579 struct die_info *comp_unit_die,
9583 struct dwarf2_cu *cu = reader->cu;
9584 enum language *language_ptr = (enum language *) data;
9586 gdb_assert (cu->die_hash == NULL);
9588 htab_create_alloc_ex (cu->header.length / 12,
9592 &cu->comp_unit_obstack,
9593 hashtab_obstack_allocate,
9594 dummy_obstack_deallocate);
9597 comp_unit_die->child = read_die_and_siblings (reader, info_ptr,
9598 &info_ptr, comp_unit_die);
9599 cu->dies = comp_unit_die;
9600 /* comp_unit_die is not stored in die_hash, no need. */
9602 /* We try not to read any attributes in this function, because not
9603 all CUs needed for references have been loaded yet, and symbol
9604 table processing isn't initialized. But we have to set the CU language,
9605 or we won't be able to build types correctly.
9606 Similarly, if we do not read the producer, we can not apply
9607 producer-specific interpretation. */
9608 prepare_one_comp_unit (cu, cu->dies, *language_ptr);
9611 /* Load the DIEs associated with PER_CU into memory. */
9614 load_full_comp_unit (struct dwarf2_per_cu_data *this_cu,
9616 enum language pretend_language)
9618 gdb_assert (! this_cu->is_debug_types);
9620 init_cutu_and_read_dies (this_cu, NULL, 1, 1, skip_partial,
9621 load_full_comp_unit_reader, &pretend_language);
9624 /* Add a DIE to the delayed physname list. */
9627 add_to_method_list (struct type *type, int fnfield_index, int index,
9628 const char *name, struct die_info *die,
9629 struct dwarf2_cu *cu)
9631 struct delayed_method_info mi;
9633 mi.fnfield_index = fnfield_index;
9637 cu->method_list.push_back (mi);
9640 /* Check whether [PHYSNAME, PHYSNAME+LEN) ends with a modifier like
9641 "const" / "volatile". If so, decrements LEN by the length of the
9642 modifier and return true. Otherwise return false. */
9646 check_modifier (const char *physname, size_t &len, const char (&mod)[N])
9648 size_t mod_len = sizeof (mod) - 1;
9649 if (len > mod_len && startswith (physname + (len - mod_len), mod))
9657 /* Compute the physnames of any methods on the CU's method list.
9659 The computation of method physnames is delayed in order to avoid the
9660 (bad) condition that one of the method's formal parameters is of an as yet
9664 compute_delayed_physnames (struct dwarf2_cu *cu)
9666 /* Only C++ delays computing physnames. */
9667 if (cu->method_list.empty ())
9669 gdb_assert (cu->language == language_cplus);
9671 for (const delayed_method_info &mi : cu->method_list)
9673 const char *physname;
9674 struct fn_fieldlist *fn_flp
9675 = &TYPE_FN_FIELDLIST (mi.type, mi.fnfield_index);
9676 physname = dwarf2_physname (mi.name, mi.die, cu);
9677 TYPE_FN_FIELD_PHYSNAME (fn_flp->fn_fields, mi.index)
9678 = physname ? physname : "";
9680 /* Since there's no tag to indicate whether a method is a
9681 const/volatile overload, extract that information out of the
9683 if (physname != NULL)
9685 size_t len = strlen (physname);
9689 if (physname[len] == ')') /* shortcut */
9691 else if (check_modifier (physname, len, " const"))
9692 TYPE_FN_FIELD_CONST (fn_flp->fn_fields, mi.index) = 1;
9693 else if (check_modifier (physname, len, " volatile"))
9694 TYPE_FN_FIELD_VOLATILE (fn_flp->fn_fields, mi.index) = 1;
9701 /* The list is no longer needed. */
9702 cu->method_list.clear ();
9705 /* A wrapper for add_symbol_to_list to ensure that SYMBOL's language is
9706 the same as all other symbols in LISTHEAD. If a new symbol is added
9707 with a different language, this function asserts. */
9710 dw2_add_symbol_to_list (struct symbol *symbol, struct pending **listhead)
9712 /* Only assert if LISTHEAD already contains symbols of a different
9713 language (dict_create_hashed/insert_symbol_hashed requires that all
9714 symbols in this list are of the same language). */
9715 gdb_assert ((*listhead) == NULL
9716 || (SYMBOL_LANGUAGE ((*listhead)->symbol[0])
9717 == SYMBOL_LANGUAGE (symbol)));
9719 add_symbol_to_list (symbol, listhead);
9722 /* Go objects should be embedded in a DW_TAG_module DIE,
9723 and it's not clear if/how imported objects will appear.
9724 To keep Go support simple until that's worked out,
9725 go back through what we've read and create something usable.
9726 We could do this while processing each DIE, and feels kinda cleaner,
9727 but that way is more invasive.
9728 This is to, for example, allow the user to type "p var" or "b main"
9729 without having to specify the package name, and allow lookups
9730 of module.object to work in contexts that use the expression
9734 fixup_go_packaging (struct dwarf2_cu *cu)
9736 char *package_name = NULL;
9737 struct pending *list;
9740 for (list = *cu->builder->get_global_symbols ();
9744 for (i = 0; i < list->nsyms; ++i)
9746 struct symbol *sym = list->symbol[i];
9748 if (SYMBOL_LANGUAGE (sym) == language_go
9749 && SYMBOL_CLASS (sym) == LOC_BLOCK)
9751 char *this_package_name = go_symbol_package_name (sym);
9753 if (this_package_name == NULL)
9755 if (package_name == NULL)
9756 package_name = this_package_name;
9759 struct objfile *objfile
9760 = cu->per_cu->dwarf2_per_objfile->objfile;
9761 if (strcmp (package_name, this_package_name) != 0)
9762 complaint (_("Symtab %s has objects from two different Go packages: %s and %s"),
9763 (symbol_symtab (sym) != NULL
9764 ? symtab_to_filename_for_display
9765 (symbol_symtab (sym))
9766 : objfile_name (objfile)),
9767 this_package_name, package_name);
9768 xfree (this_package_name);
9774 if (package_name != NULL)
9776 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
9777 const char *saved_package_name
9778 = (const char *) obstack_copy0 (&objfile->per_bfd->storage_obstack,
9780 strlen (package_name));
9781 struct type *type = init_type (objfile, TYPE_CODE_MODULE, 0,
9782 saved_package_name);
9785 sym = allocate_symbol (objfile);
9786 SYMBOL_SET_LANGUAGE (sym, language_go, &objfile->objfile_obstack);
9787 SYMBOL_SET_NAMES (sym, saved_package_name,
9788 strlen (saved_package_name), 0, objfile);
9789 /* This is not VAR_DOMAIN because we want a way to ensure a lookup of,
9790 e.g., "main" finds the "main" module and not C's main(). */
9791 SYMBOL_DOMAIN (sym) = STRUCT_DOMAIN;
9792 SYMBOL_ACLASS_INDEX (sym) = LOC_TYPEDEF;
9793 SYMBOL_TYPE (sym) = type;
9795 dw2_add_symbol_to_list (sym, cu->builder->get_global_symbols ());
9797 xfree (package_name);
9801 /* Allocate a fully-qualified name consisting of the two parts on the
9805 rust_fully_qualify (struct obstack *obstack, const char *p1, const char *p2)
9807 return obconcat (obstack, p1, "::", p2, (char *) NULL);
9810 /* A helper that allocates a struct discriminant_info to attach to a
9813 static struct discriminant_info *
9814 alloc_discriminant_info (struct type *type, int discriminant_index,
9817 gdb_assert (TYPE_CODE (type) == TYPE_CODE_UNION);
9818 gdb_assert (discriminant_index == -1
9819 || (discriminant_index >= 0
9820 && discriminant_index < TYPE_NFIELDS (type)));
9821 gdb_assert (default_index == -1
9822 || (default_index >= 0 && default_index < TYPE_NFIELDS (type)));
9824 TYPE_FLAG_DISCRIMINATED_UNION (type) = 1;
9826 struct discriminant_info *disc
9827 = ((struct discriminant_info *)
9829 offsetof (struct discriminant_info, discriminants)
9830 + TYPE_NFIELDS (type) * sizeof (disc->discriminants[0])));
9831 disc->default_index = default_index;
9832 disc->discriminant_index = discriminant_index;
9834 struct dynamic_prop prop;
9835 prop.kind = PROP_UNDEFINED;
9836 prop.data.baton = disc;
9838 add_dyn_prop (DYN_PROP_DISCRIMINATED, prop, type);
9843 /* Some versions of rustc emitted enums in an unusual way.
9845 Ordinary enums were emitted as unions. The first element of each
9846 structure in the union was named "RUST$ENUM$DISR". This element
9847 held the discriminant.
9849 These versions of Rust also implemented the "non-zero"
9850 optimization. When the enum had two values, and one is empty and
9851 the other holds a pointer that cannot be zero, the pointer is used
9852 as the discriminant, with a zero value meaning the empty variant.
9853 Here, the union's first member is of the form
9854 RUST$ENCODED$ENUM$<fieldno>$<fieldno>$...$<variantname>
9855 where the fieldnos are the indices of the fields that should be
9856 traversed in order to find the field (which may be several fields deep)
9857 and the variantname is the name of the variant of the case when the
9860 This function recognizes whether TYPE is of one of these forms,
9861 and, if so, smashes it to be a variant type. */
9864 quirk_rust_enum (struct type *type, struct objfile *objfile)
9866 gdb_assert (TYPE_CODE (type) == TYPE_CODE_UNION);
9868 /* We don't need to deal with empty enums. */
9869 if (TYPE_NFIELDS (type) == 0)
9872 #define RUST_ENUM_PREFIX "RUST$ENCODED$ENUM$"
9873 if (TYPE_NFIELDS (type) == 1
9874 && startswith (TYPE_FIELD_NAME (type, 0), RUST_ENUM_PREFIX))
9876 const char *name = TYPE_FIELD_NAME (type, 0) + strlen (RUST_ENUM_PREFIX);
9878 /* Decode the field name to find the offset of the
9880 ULONGEST bit_offset = 0;
9881 struct type *field_type = TYPE_FIELD_TYPE (type, 0);
9882 while (name[0] >= '0' && name[0] <= '9')
9885 unsigned long index = strtoul (name, &tail, 10);
9888 || index >= TYPE_NFIELDS (field_type)
9889 || (TYPE_FIELD_LOC_KIND (field_type, index)
9890 != FIELD_LOC_KIND_BITPOS))
9892 complaint (_("Could not parse Rust enum encoding string \"%s\""
9894 TYPE_FIELD_NAME (type, 0),
9895 objfile_name (objfile));
9900 bit_offset += TYPE_FIELD_BITPOS (field_type, index);
9901 field_type = TYPE_FIELD_TYPE (field_type, index);
9904 /* Make a union to hold the variants. */
9905 struct type *union_type = alloc_type (objfile);
9906 TYPE_CODE (union_type) = TYPE_CODE_UNION;
9907 TYPE_NFIELDS (union_type) = 3;
9908 TYPE_FIELDS (union_type)
9909 = (struct field *) TYPE_ZALLOC (type, 3 * sizeof (struct field));
9910 TYPE_LENGTH (union_type) = TYPE_LENGTH (type);
9911 set_type_align (union_type, TYPE_RAW_ALIGN (type));
9913 /* Put the discriminant must at index 0. */
9914 TYPE_FIELD_TYPE (union_type, 0) = field_type;
9915 TYPE_FIELD_ARTIFICIAL (union_type, 0) = 1;
9916 TYPE_FIELD_NAME (union_type, 0) = "<<discriminant>>";
9917 SET_FIELD_BITPOS (TYPE_FIELD (union_type, 0), bit_offset);
9919 /* The order of fields doesn't really matter, so put the real
9920 field at index 1 and the data-less field at index 2. */
9921 struct discriminant_info *disc
9922 = alloc_discriminant_info (union_type, 0, 1);
9923 TYPE_FIELD (union_type, 1) = TYPE_FIELD (type, 0);
9924 TYPE_FIELD_NAME (union_type, 1)
9925 = rust_last_path_segment (TYPE_NAME (TYPE_FIELD_TYPE (union_type, 1)));
9926 TYPE_NAME (TYPE_FIELD_TYPE (union_type, 1))
9927 = rust_fully_qualify (&objfile->objfile_obstack, TYPE_NAME (type),
9928 TYPE_FIELD_NAME (union_type, 1));
9930 const char *dataless_name
9931 = rust_fully_qualify (&objfile->objfile_obstack, TYPE_NAME (type),
9933 struct type *dataless_type = init_type (objfile, TYPE_CODE_VOID, 0,
9935 TYPE_FIELD_TYPE (union_type, 2) = dataless_type;
9936 /* NAME points into the original discriminant name, which
9937 already has the correct lifetime. */
9938 TYPE_FIELD_NAME (union_type, 2) = name;
9939 SET_FIELD_BITPOS (TYPE_FIELD (union_type, 2), 0);
9940 disc->discriminants[2] = 0;
9942 /* Smash this type to be a structure type. We have to do this
9943 because the type has already been recorded. */
9944 TYPE_CODE (type) = TYPE_CODE_STRUCT;
9945 TYPE_NFIELDS (type) = 1;
9947 = (struct field *) TYPE_ZALLOC (type, sizeof (struct field));
9949 /* Install the variant part. */
9950 TYPE_FIELD_TYPE (type, 0) = union_type;
9951 SET_FIELD_BITPOS (TYPE_FIELD (type, 0), 0);
9952 TYPE_FIELD_NAME (type, 0) = "<<variants>>";
9954 else if (TYPE_NFIELDS (type) == 1)
9956 /* We assume that a union with a single field is a univariant
9958 /* Smash this type to be a structure type. We have to do this
9959 because the type has already been recorded. */
9960 TYPE_CODE (type) = TYPE_CODE_STRUCT;
9962 /* Make a union to hold the variants. */
9963 struct type *union_type = alloc_type (objfile);
9964 TYPE_CODE (union_type) = TYPE_CODE_UNION;
9965 TYPE_NFIELDS (union_type) = TYPE_NFIELDS (type);
9966 TYPE_LENGTH (union_type) = TYPE_LENGTH (type);
9967 set_type_align (union_type, TYPE_RAW_ALIGN (type));
9968 TYPE_FIELDS (union_type) = TYPE_FIELDS (type);
9970 struct type *field_type = TYPE_FIELD_TYPE (union_type, 0);
9971 const char *variant_name
9972 = rust_last_path_segment (TYPE_NAME (field_type));
9973 TYPE_FIELD_NAME (union_type, 0) = variant_name;
9974 TYPE_NAME (field_type)
9975 = rust_fully_qualify (&objfile->objfile_obstack,
9976 TYPE_NAME (type), variant_name);
9978 /* Install the union in the outer struct type. */
9979 TYPE_NFIELDS (type) = 1;
9981 = (struct field *) TYPE_ZALLOC (union_type, sizeof (struct field));
9982 TYPE_FIELD_TYPE (type, 0) = union_type;
9983 TYPE_FIELD_NAME (type, 0) = "<<variants>>";
9984 SET_FIELD_BITPOS (TYPE_FIELD (type, 0), 0);
9986 alloc_discriminant_info (union_type, -1, 0);
9990 struct type *disr_type = nullptr;
9991 for (int i = 0; i < TYPE_NFIELDS (type); ++i)
9993 disr_type = TYPE_FIELD_TYPE (type, i);
9995 if (TYPE_CODE (disr_type) != TYPE_CODE_STRUCT)
9997 /* All fields of a true enum will be structs. */
10000 else if (TYPE_NFIELDS (disr_type) == 0)
10002 /* Could be data-less variant, so keep going. */
10003 disr_type = nullptr;
10005 else if (strcmp (TYPE_FIELD_NAME (disr_type, 0),
10006 "RUST$ENUM$DISR") != 0)
10008 /* Not a Rust enum. */
10018 /* If we got here without a discriminant, then it's probably
10020 if (disr_type == nullptr)
10023 /* Smash this type to be a structure type. We have to do this
10024 because the type has already been recorded. */
10025 TYPE_CODE (type) = TYPE_CODE_STRUCT;
10027 /* Make a union to hold the variants. */
10028 struct field *disr_field = &TYPE_FIELD (disr_type, 0);
10029 struct type *union_type = alloc_type (objfile);
10030 TYPE_CODE (union_type) = TYPE_CODE_UNION;
10031 TYPE_NFIELDS (union_type) = 1 + TYPE_NFIELDS (type);
10032 TYPE_LENGTH (union_type) = TYPE_LENGTH (type);
10033 set_type_align (union_type, TYPE_RAW_ALIGN (type));
10034 TYPE_FIELDS (union_type)
10035 = (struct field *) TYPE_ZALLOC (union_type,
10036 (TYPE_NFIELDS (union_type)
10037 * sizeof (struct field)));
10039 memcpy (TYPE_FIELDS (union_type) + 1, TYPE_FIELDS (type),
10040 TYPE_NFIELDS (type) * sizeof (struct field));
10042 /* Install the discriminant at index 0 in the union. */
10043 TYPE_FIELD (union_type, 0) = *disr_field;
10044 TYPE_FIELD_ARTIFICIAL (union_type, 0) = 1;
10045 TYPE_FIELD_NAME (union_type, 0) = "<<discriminant>>";
10047 /* Install the union in the outer struct type. */
10048 TYPE_FIELD_TYPE (type, 0) = union_type;
10049 TYPE_FIELD_NAME (type, 0) = "<<variants>>";
10050 TYPE_NFIELDS (type) = 1;
10052 /* Set the size and offset of the union type. */
10053 SET_FIELD_BITPOS (TYPE_FIELD (type, 0), 0);
10055 /* We need a way to find the correct discriminant given a
10056 variant name. For convenience we build a map here. */
10057 struct type *enum_type = FIELD_TYPE (*disr_field);
10058 std::unordered_map<std::string, ULONGEST> discriminant_map;
10059 for (int i = 0; i < TYPE_NFIELDS (enum_type); ++i)
10061 if (TYPE_FIELD_LOC_KIND (enum_type, i) == FIELD_LOC_KIND_ENUMVAL)
10064 = rust_last_path_segment (TYPE_FIELD_NAME (enum_type, i));
10065 discriminant_map[name] = TYPE_FIELD_ENUMVAL (enum_type, i);
10069 int n_fields = TYPE_NFIELDS (union_type);
10070 struct discriminant_info *disc
10071 = alloc_discriminant_info (union_type, 0, -1);
10072 /* Skip the discriminant here. */
10073 for (int i = 1; i < n_fields; ++i)
10075 /* Find the final word in the name of this variant's type.
10076 That name can be used to look up the correct
10078 const char *variant_name
10079 = rust_last_path_segment (TYPE_NAME (TYPE_FIELD_TYPE (union_type,
10082 auto iter = discriminant_map.find (variant_name);
10083 if (iter != discriminant_map.end ())
10084 disc->discriminants[i] = iter->second;
10086 /* Remove the discriminant field, if it exists. */
10087 struct type *sub_type = TYPE_FIELD_TYPE (union_type, i);
10088 if (TYPE_NFIELDS (sub_type) > 0)
10090 --TYPE_NFIELDS (sub_type);
10091 ++TYPE_FIELDS (sub_type);
10093 TYPE_FIELD_NAME (union_type, i) = variant_name;
10094 TYPE_NAME (sub_type)
10095 = rust_fully_qualify (&objfile->objfile_obstack,
10096 TYPE_NAME (type), variant_name);
10101 /* Rewrite some Rust unions to be structures with variants parts. */
10104 rust_union_quirks (struct dwarf2_cu *cu)
10106 gdb_assert (cu->language == language_rust);
10107 for (type *type_ : cu->rust_unions)
10108 quirk_rust_enum (type_, cu->per_cu->dwarf2_per_objfile->objfile);
10109 /* We don't need this any more. */
10110 cu->rust_unions.clear ();
10113 /* Return the symtab for PER_CU. This works properly regardless of
10114 whether we're using the index or psymtabs. */
10116 static struct compunit_symtab *
10117 get_compunit_symtab (struct dwarf2_per_cu_data *per_cu)
10119 return (per_cu->dwarf2_per_objfile->using_index
10120 ? per_cu->v.quick->compunit_symtab
10121 : per_cu->v.psymtab->compunit_symtab);
10124 /* A helper function for computing the list of all symbol tables
10125 included by PER_CU. */
10128 recursively_compute_inclusions (VEC (compunit_symtab_ptr) **result,
10129 htab_t all_children, htab_t all_type_symtabs,
10130 struct dwarf2_per_cu_data *per_cu,
10131 struct compunit_symtab *immediate_parent)
10135 struct compunit_symtab *cust;
10136 struct dwarf2_per_cu_data *iter;
10138 slot = htab_find_slot (all_children, per_cu, INSERT);
10141 /* This inclusion and its children have been processed. */
10146 /* Only add a CU if it has a symbol table. */
10147 cust = get_compunit_symtab (per_cu);
10150 /* If this is a type unit only add its symbol table if we haven't
10151 seen it yet (type unit per_cu's can share symtabs). */
10152 if (per_cu->is_debug_types)
10154 slot = htab_find_slot (all_type_symtabs, cust, INSERT);
10158 VEC_safe_push (compunit_symtab_ptr, *result, cust);
10159 if (cust->user == NULL)
10160 cust->user = immediate_parent;
10165 VEC_safe_push (compunit_symtab_ptr, *result, cust);
10166 if (cust->user == NULL)
10167 cust->user = immediate_parent;
10172 VEC_iterate (dwarf2_per_cu_ptr, per_cu->imported_symtabs, ix, iter);
10175 recursively_compute_inclusions (result, all_children,
10176 all_type_symtabs, iter, cust);
10180 /* Compute the compunit_symtab 'includes' fields for the compunit_symtab of
10184 compute_compunit_symtab_includes (struct dwarf2_per_cu_data *per_cu)
10186 gdb_assert (! per_cu->is_debug_types);
10188 if (!VEC_empty (dwarf2_per_cu_ptr, per_cu->imported_symtabs))
10191 struct dwarf2_per_cu_data *per_cu_iter;
10192 struct compunit_symtab *compunit_symtab_iter;
10193 VEC (compunit_symtab_ptr) *result_symtabs = NULL;
10194 htab_t all_children, all_type_symtabs;
10195 struct compunit_symtab *cust = get_compunit_symtab (per_cu);
10197 /* If we don't have a symtab, we can just skip this case. */
10201 all_children = htab_create_alloc (1, htab_hash_pointer, htab_eq_pointer,
10202 NULL, xcalloc, xfree);
10203 all_type_symtabs = htab_create_alloc (1, htab_hash_pointer, htab_eq_pointer,
10204 NULL, xcalloc, xfree);
10207 VEC_iterate (dwarf2_per_cu_ptr, per_cu->imported_symtabs,
10211 recursively_compute_inclusions (&result_symtabs, all_children,
10212 all_type_symtabs, per_cu_iter,
10216 /* Now we have a transitive closure of all the included symtabs. */
10217 len = VEC_length (compunit_symtab_ptr, result_symtabs);
10219 = XOBNEWVEC (&per_cu->dwarf2_per_objfile->objfile->objfile_obstack,
10220 struct compunit_symtab *, len + 1);
10222 VEC_iterate (compunit_symtab_ptr, result_symtabs, ix,
10223 compunit_symtab_iter);
10225 cust->includes[ix] = compunit_symtab_iter;
10226 cust->includes[len] = NULL;
10228 VEC_free (compunit_symtab_ptr, result_symtabs);
10229 htab_delete (all_children);
10230 htab_delete (all_type_symtabs);
10234 /* Compute the 'includes' field for the symtabs of all the CUs we just
10238 process_cu_includes (struct dwarf2_per_objfile *dwarf2_per_objfile)
10240 for (dwarf2_per_cu_data *iter : dwarf2_per_objfile->just_read_cus)
10242 if (! iter->is_debug_types)
10243 compute_compunit_symtab_includes (iter);
10246 dwarf2_per_objfile->just_read_cus.clear ();
10249 /* Generate full symbol information for PER_CU, whose DIEs have
10250 already been loaded into memory. */
10253 process_full_comp_unit (struct dwarf2_per_cu_data *per_cu,
10254 enum language pretend_language)
10256 struct dwarf2_cu *cu = per_cu->cu;
10257 struct dwarf2_per_objfile *dwarf2_per_objfile = per_cu->dwarf2_per_objfile;
10258 struct objfile *objfile = dwarf2_per_objfile->objfile;
10259 struct gdbarch *gdbarch = get_objfile_arch (objfile);
10260 CORE_ADDR lowpc, highpc;
10261 struct compunit_symtab *cust;
10262 CORE_ADDR baseaddr;
10263 struct block *static_block;
10266 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
10268 /* Clear the list here in case something was left over. */
10269 cu->method_list.clear ();
10271 cu->language = pretend_language;
10272 cu->language_defn = language_def (cu->language);
10274 /* Do line number decoding in read_file_scope () */
10275 process_die (cu->dies, cu);
10277 /* For now fudge the Go package. */
10278 if (cu->language == language_go)
10279 fixup_go_packaging (cu);
10281 /* Now that we have processed all the DIEs in the CU, all the types
10282 should be complete, and it should now be safe to compute all of the
10284 compute_delayed_physnames (cu);
10286 if (cu->language == language_rust)
10287 rust_union_quirks (cu);
10289 /* Some compilers don't define a DW_AT_high_pc attribute for the
10290 compilation unit. If the DW_AT_high_pc is missing, synthesize
10291 it, by scanning the DIE's below the compilation unit. */
10292 get_scope_pc_bounds (cu->dies, &lowpc, &highpc, cu);
10294 addr = gdbarch_adjust_dwarf2_addr (gdbarch, highpc + baseaddr);
10295 static_block = cu->builder->end_symtab_get_static_block (addr, 0, 1);
10297 /* If the comp unit has DW_AT_ranges, it may have discontiguous ranges.
10298 Also, DW_AT_ranges may record ranges not belonging to any child DIEs
10299 (such as virtual method tables). Record the ranges in STATIC_BLOCK's
10300 addrmap to help ensure it has an accurate map of pc values belonging to
10302 dwarf2_record_block_ranges (cu->dies, static_block, baseaddr, cu);
10304 cust = cu->builder->end_symtab_from_static_block (static_block,
10305 SECT_OFF_TEXT (objfile),
10310 int gcc_4_minor = producer_is_gcc_ge_4 (cu->producer);
10312 /* Set symtab language to language from DW_AT_language. If the
10313 compilation is from a C file generated by language preprocessors, do
10314 not set the language if it was already deduced by start_subfile. */
10315 if (!(cu->language == language_c
10316 && COMPUNIT_FILETABS (cust)->language != language_unknown))
10317 COMPUNIT_FILETABS (cust)->language = cu->language;
10319 /* GCC-4.0 has started to support -fvar-tracking. GCC-3.x still can
10320 produce DW_AT_location with location lists but it can be possibly
10321 invalid without -fvar-tracking. Still up to GCC-4.4.x incl. 4.4.0
10322 there were bugs in prologue debug info, fixed later in GCC-4.5
10323 by "unwind info for epilogues" patch (which is not directly related).
10325 For -gdwarf-4 type units LOCATIONS_VALID indication is fortunately not
10326 needed, it would be wrong due to missing DW_AT_producer there.
10328 Still one can confuse GDB by using non-standard GCC compilation
10329 options - this waits on GCC PR other/32998 (-frecord-gcc-switches).
10331 if (cu->has_loclist && gcc_4_minor >= 5)
10332 cust->locations_valid = 1;
10334 if (gcc_4_minor >= 5)
10335 cust->epilogue_unwind_valid = 1;
10337 cust->call_site_htab = cu->call_site_htab;
10340 if (dwarf2_per_objfile->using_index)
10341 per_cu->v.quick->compunit_symtab = cust;
10344 struct partial_symtab *pst = per_cu->v.psymtab;
10345 pst->compunit_symtab = cust;
10349 /* Push it for inclusion processing later. */
10350 dwarf2_per_objfile->just_read_cus.push_back (per_cu);
10352 /* Not needed any more. */
10353 cu->builder.reset ();
10356 /* Generate full symbol information for type unit PER_CU, whose DIEs have
10357 already been loaded into memory. */
10360 process_full_type_unit (struct dwarf2_per_cu_data *per_cu,
10361 enum language pretend_language)
10363 struct dwarf2_cu *cu = per_cu->cu;
10364 struct dwarf2_per_objfile *dwarf2_per_objfile = per_cu->dwarf2_per_objfile;
10365 struct objfile *objfile = dwarf2_per_objfile->objfile;
10366 struct compunit_symtab *cust;
10367 struct signatured_type *sig_type;
10369 gdb_assert (per_cu->is_debug_types);
10370 sig_type = (struct signatured_type *) per_cu;
10372 /* Clear the list here in case something was left over. */
10373 cu->method_list.clear ();
10375 cu->language = pretend_language;
10376 cu->language_defn = language_def (cu->language);
10378 /* The symbol tables are set up in read_type_unit_scope. */
10379 process_die (cu->dies, cu);
10381 /* For now fudge the Go package. */
10382 if (cu->language == language_go)
10383 fixup_go_packaging (cu);
10385 /* Now that we have processed all the DIEs in the CU, all the types
10386 should be complete, and it should now be safe to compute all of the
10388 compute_delayed_physnames (cu);
10390 if (cu->language == language_rust)
10391 rust_union_quirks (cu);
10393 /* TUs share symbol tables.
10394 If this is the first TU to use this symtab, complete the construction
10395 of it with end_expandable_symtab. Otherwise, complete the addition of
10396 this TU's symbols to the existing symtab. */
10397 if (sig_type->type_unit_group->compunit_symtab == NULL)
10399 cust = cu->builder->end_expandable_symtab (0, SECT_OFF_TEXT (objfile));
10400 sig_type->type_unit_group->compunit_symtab = cust;
10404 /* Set symtab language to language from DW_AT_language. If the
10405 compilation is from a C file generated by language preprocessors,
10406 do not set the language if it was already deduced by
10408 if (!(cu->language == language_c
10409 && COMPUNIT_FILETABS (cust)->language != language_c))
10410 COMPUNIT_FILETABS (cust)->language = cu->language;
10415 cu->builder->augment_type_symtab ();
10416 cust = sig_type->type_unit_group->compunit_symtab;
10419 if (dwarf2_per_objfile->using_index)
10420 per_cu->v.quick->compunit_symtab = cust;
10423 struct partial_symtab *pst = per_cu->v.psymtab;
10424 pst->compunit_symtab = cust;
10428 /* Not needed any more. */
10429 cu->builder.reset ();
10432 /* Process an imported unit DIE. */
10435 process_imported_unit_die (struct die_info *die, struct dwarf2_cu *cu)
10437 struct attribute *attr;
10439 /* For now we don't handle imported units in type units. */
10440 if (cu->per_cu->is_debug_types)
10442 error (_("Dwarf Error: DW_TAG_imported_unit is not"
10443 " supported in type units [in module %s]"),
10444 objfile_name (cu->per_cu->dwarf2_per_objfile->objfile));
10447 attr = dwarf2_attr (die, DW_AT_import, cu);
10450 sect_offset sect_off = dwarf2_get_ref_die_offset (attr);
10451 bool is_dwz = (attr->form == DW_FORM_GNU_ref_alt || cu->per_cu->is_dwz);
10452 dwarf2_per_cu_data *per_cu
10453 = dwarf2_find_containing_comp_unit (sect_off, is_dwz,
10454 cu->per_cu->dwarf2_per_objfile);
10456 /* If necessary, add it to the queue and load its DIEs. */
10457 if (maybe_queue_comp_unit (cu, per_cu, cu->language))
10458 load_full_comp_unit (per_cu, false, cu->language);
10460 VEC_safe_push (dwarf2_per_cu_ptr, cu->per_cu->imported_symtabs,
10465 /* RAII object that represents a process_die scope: i.e.,
10466 starts/finishes processing a DIE. */
10467 class process_die_scope
10470 process_die_scope (die_info *die, dwarf2_cu *cu)
10471 : m_die (die), m_cu (cu)
10473 /* We should only be processing DIEs not already in process. */
10474 gdb_assert (!m_die->in_process);
10475 m_die->in_process = true;
10478 ~process_die_scope ()
10480 m_die->in_process = false;
10482 /* If we're done processing the DIE for the CU that owns the line
10483 header, we don't need the line header anymore. */
10484 if (m_cu->line_header_die_owner == m_die)
10486 delete m_cu->line_header;
10487 m_cu->line_header = NULL;
10488 m_cu->line_header_die_owner = NULL;
10497 /* Process a die and its children. */
10500 process_die (struct die_info *die, struct dwarf2_cu *cu)
10502 process_die_scope scope (die, cu);
10506 case DW_TAG_padding:
10508 case DW_TAG_compile_unit:
10509 case DW_TAG_partial_unit:
10510 read_file_scope (die, cu);
10512 case DW_TAG_type_unit:
10513 read_type_unit_scope (die, cu);
10515 case DW_TAG_subprogram:
10516 case DW_TAG_inlined_subroutine:
10517 read_func_scope (die, cu);
10519 case DW_TAG_lexical_block:
10520 case DW_TAG_try_block:
10521 case DW_TAG_catch_block:
10522 read_lexical_block_scope (die, cu);
10524 case DW_TAG_call_site:
10525 case DW_TAG_GNU_call_site:
10526 read_call_site_scope (die, cu);
10528 case DW_TAG_class_type:
10529 case DW_TAG_interface_type:
10530 case DW_TAG_structure_type:
10531 case DW_TAG_union_type:
10532 process_structure_scope (die, cu);
10534 case DW_TAG_enumeration_type:
10535 process_enumeration_scope (die, cu);
10538 /* These dies have a type, but processing them does not create
10539 a symbol or recurse to process the children. Therefore we can
10540 read them on-demand through read_type_die. */
10541 case DW_TAG_subroutine_type:
10542 case DW_TAG_set_type:
10543 case DW_TAG_array_type:
10544 case DW_TAG_pointer_type:
10545 case DW_TAG_ptr_to_member_type:
10546 case DW_TAG_reference_type:
10547 case DW_TAG_rvalue_reference_type:
10548 case DW_TAG_string_type:
10551 case DW_TAG_base_type:
10552 case DW_TAG_subrange_type:
10553 case DW_TAG_typedef:
10554 /* Add a typedef symbol for the type definition, if it has a
10556 new_symbol (die, read_type_die (die, cu), cu);
10558 case DW_TAG_common_block:
10559 read_common_block (die, cu);
10561 case DW_TAG_common_inclusion:
10563 case DW_TAG_namespace:
10564 cu->processing_has_namespace_info = 1;
10565 read_namespace (die, cu);
10567 case DW_TAG_module:
10568 cu->processing_has_namespace_info = 1;
10569 read_module (die, cu);
10571 case DW_TAG_imported_declaration:
10572 cu->processing_has_namespace_info = 1;
10573 if (read_namespace_alias (die, cu))
10575 /* The declaration is not a global namespace alias. */
10576 /* Fall through. */
10577 case DW_TAG_imported_module:
10578 cu->processing_has_namespace_info = 1;
10579 if (die->child != NULL && (die->tag == DW_TAG_imported_declaration
10580 || cu->language != language_fortran))
10581 complaint (_("Tag '%s' has unexpected children"),
10582 dwarf_tag_name (die->tag));
10583 read_import_statement (die, cu);
10586 case DW_TAG_imported_unit:
10587 process_imported_unit_die (die, cu);
10590 case DW_TAG_variable:
10591 read_variable (die, cu);
10595 new_symbol (die, NULL, cu);
10600 /* DWARF name computation. */
10602 /* A helper function for dwarf2_compute_name which determines whether DIE
10603 needs to have the name of the scope prepended to the name listed in the
10607 die_needs_namespace (struct die_info *die, struct dwarf2_cu *cu)
10609 struct attribute *attr;
10613 case DW_TAG_namespace:
10614 case DW_TAG_typedef:
10615 case DW_TAG_class_type:
10616 case DW_TAG_interface_type:
10617 case DW_TAG_structure_type:
10618 case DW_TAG_union_type:
10619 case DW_TAG_enumeration_type:
10620 case DW_TAG_enumerator:
10621 case DW_TAG_subprogram:
10622 case DW_TAG_inlined_subroutine:
10623 case DW_TAG_member:
10624 case DW_TAG_imported_declaration:
10627 case DW_TAG_variable:
10628 case DW_TAG_constant:
10629 /* We only need to prefix "globally" visible variables. These include
10630 any variable marked with DW_AT_external or any variable that
10631 lives in a namespace. [Variables in anonymous namespaces
10632 require prefixing, but they are not DW_AT_external.] */
10634 if (dwarf2_attr (die, DW_AT_specification, cu))
10636 struct dwarf2_cu *spec_cu = cu;
10638 return die_needs_namespace (die_specification (die, &spec_cu),
10642 attr = dwarf2_attr (die, DW_AT_external, cu);
10643 if (attr == NULL && die->parent->tag != DW_TAG_namespace
10644 && die->parent->tag != DW_TAG_module)
10646 /* A variable in a lexical block of some kind does not need a
10647 namespace, even though in C++ such variables may be external
10648 and have a mangled name. */
10649 if (die->parent->tag == DW_TAG_lexical_block
10650 || die->parent->tag == DW_TAG_try_block
10651 || die->parent->tag == DW_TAG_catch_block
10652 || die->parent->tag == DW_TAG_subprogram)
10661 /* Return the DIE's linkage name attribute, either DW_AT_linkage_name
10662 or DW_AT_MIPS_linkage_name. Returns NULL if the attribute is not
10663 defined for the given DIE. */
10665 static struct attribute *
10666 dw2_linkage_name_attr (struct die_info *die, struct dwarf2_cu *cu)
10668 struct attribute *attr;
10670 attr = dwarf2_attr (die, DW_AT_linkage_name, cu);
10672 attr = dwarf2_attr (die, DW_AT_MIPS_linkage_name, cu);
10677 /* Return the DIE's linkage name as a string, either DW_AT_linkage_name
10678 or DW_AT_MIPS_linkage_name. Returns NULL if the attribute is not
10679 defined for the given DIE. */
10681 static const char *
10682 dw2_linkage_name (struct die_info *die, struct dwarf2_cu *cu)
10684 const char *linkage_name;
10686 linkage_name = dwarf2_string_attr (die, DW_AT_linkage_name, cu);
10687 if (linkage_name == NULL)
10688 linkage_name = dwarf2_string_attr (die, DW_AT_MIPS_linkage_name, cu);
10690 return linkage_name;
10693 /* Compute the fully qualified name of DIE in CU. If PHYSNAME is nonzero,
10694 compute the physname for the object, which include a method's:
10695 - formal parameters (C++),
10696 - receiver type (Go),
10698 The term "physname" is a bit confusing.
10699 For C++, for example, it is the demangled name.
10700 For Go, for example, it's the mangled name.
10702 For Ada, return the DIE's linkage name rather than the fully qualified
10703 name. PHYSNAME is ignored..
10705 The result is allocated on the objfile_obstack and canonicalized. */
10707 static const char *
10708 dwarf2_compute_name (const char *name,
10709 struct die_info *die, struct dwarf2_cu *cu,
10712 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
10715 name = dwarf2_name (die, cu);
10717 /* For Fortran GDB prefers DW_AT_*linkage_name for the physname if present
10718 but otherwise compute it by typename_concat inside GDB.
10719 FIXME: Actually this is not really true, or at least not always true.
10720 It's all very confusing. SYMBOL_SET_NAMES doesn't try to demangle
10721 Fortran names because there is no mangling standard. So new_symbol
10722 will set the demangled name to the result of dwarf2_full_name, and it is
10723 the demangled name that GDB uses if it exists. */
10724 if (cu->language == language_ada
10725 || (cu->language == language_fortran && physname))
10727 /* For Ada unit, we prefer the linkage name over the name, as
10728 the former contains the exported name, which the user expects
10729 to be able to reference. Ideally, we want the user to be able
10730 to reference this entity using either natural or linkage name,
10731 but we haven't started looking at this enhancement yet. */
10732 const char *linkage_name = dw2_linkage_name (die, cu);
10734 if (linkage_name != NULL)
10735 return linkage_name;
10738 /* These are the only languages we know how to qualify names in. */
10740 && (cu->language == language_cplus
10741 || cu->language == language_fortran || cu->language == language_d
10742 || cu->language == language_rust))
10744 if (die_needs_namespace (die, cu))
10746 const char *prefix;
10747 const char *canonical_name = NULL;
10751 prefix = determine_prefix (die, cu);
10752 if (*prefix != '\0')
10754 char *prefixed_name = typename_concat (NULL, prefix, name,
10757 buf.puts (prefixed_name);
10758 xfree (prefixed_name);
10763 /* Template parameters may be specified in the DIE's DW_AT_name, or
10764 as children with DW_TAG_template_type_param or
10765 DW_TAG_value_type_param. If the latter, add them to the name
10766 here. If the name already has template parameters, then
10767 skip this step; some versions of GCC emit both, and
10768 it is more efficient to use the pre-computed name.
10770 Something to keep in mind about this process: it is very
10771 unlikely, or in some cases downright impossible, to produce
10772 something that will match the mangled name of a function.
10773 If the definition of the function has the same debug info,
10774 we should be able to match up with it anyway. But fallbacks
10775 using the minimal symbol, for instance to find a method
10776 implemented in a stripped copy of libstdc++, will not work.
10777 If we do not have debug info for the definition, we will have to
10778 match them up some other way.
10780 When we do name matching there is a related problem with function
10781 templates; two instantiated function templates are allowed to
10782 differ only by their return types, which we do not add here. */
10784 if (cu->language == language_cplus && strchr (name, '<') == NULL)
10786 struct attribute *attr;
10787 struct die_info *child;
10790 die->building_fullname = 1;
10792 for (child = die->child; child != NULL; child = child->sibling)
10796 const gdb_byte *bytes;
10797 struct dwarf2_locexpr_baton *baton;
10800 if (child->tag != DW_TAG_template_type_param
10801 && child->tag != DW_TAG_template_value_param)
10812 attr = dwarf2_attr (child, DW_AT_type, cu);
10815 complaint (_("template parameter missing DW_AT_type"));
10816 buf.puts ("UNKNOWN_TYPE");
10819 type = die_type (child, cu);
10821 if (child->tag == DW_TAG_template_type_param)
10823 c_print_type (type, "", &buf, -1, 0, cu->language,
10824 &type_print_raw_options);
10828 attr = dwarf2_attr (child, DW_AT_const_value, cu);
10831 complaint (_("template parameter missing "
10832 "DW_AT_const_value"));
10833 buf.puts ("UNKNOWN_VALUE");
10837 dwarf2_const_value_attr (attr, type, name,
10838 &cu->comp_unit_obstack, cu,
10839 &value, &bytes, &baton);
10841 if (TYPE_NOSIGN (type))
10842 /* GDB prints characters as NUMBER 'CHAR'. If that's
10843 changed, this can use value_print instead. */
10844 c_printchar (value, type, &buf);
10847 struct value_print_options opts;
10850 v = dwarf2_evaluate_loc_desc (type, NULL,
10854 else if (bytes != NULL)
10856 v = allocate_value (type);
10857 memcpy (value_contents_writeable (v), bytes,
10858 TYPE_LENGTH (type));
10861 v = value_from_longest (type, value);
10863 /* Specify decimal so that we do not depend on
10865 get_formatted_print_options (&opts, 'd');
10867 value_print (v, &buf, &opts);
10872 die->building_fullname = 0;
10876 /* Close the argument list, with a space if necessary
10877 (nested templates). */
10878 if (!buf.empty () && buf.string ().back () == '>')
10885 /* For C++ methods, append formal parameter type
10886 information, if PHYSNAME. */
10888 if (physname && die->tag == DW_TAG_subprogram
10889 && cu->language == language_cplus)
10891 struct type *type = read_type_die (die, cu);
10893 c_type_print_args (type, &buf, 1, cu->language,
10894 &type_print_raw_options);
10896 if (cu->language == language_cplus)
10898 /* Assume that an artificial first parameter is
10899 "this", but do not crash if it is not. RealView
10900 marks unnamed (and thus unused) parameters as
10901 artificial; there is no way to differentiate
10903 if (TYPE_NFIELDS (type) > 0
10904 && TYPE_FIELD_ARTIFICIAL (type, 0)
10905 && TYPE_CODE (TYPE_FIELD_TYPE (type, 0)) == TYPE_CODE_PTR
10906 && TYPE_CONST (TYPE_TARGET_TYPE (TYPE_FIELD_TYPE (type,
10908 buf.puts (" const");
10912 const std::string &intermediate_name = buf.string ();
10914 if (cu->language == language_cplus)
10916 = dwarf2_canonicalize_name (intermediate_name.c_str (), cu,
10917 &objfile->per_bfd->storage_obstack);
10919 /* If we only computed INTERMEDIATE_NAME, or if
10920 INTERMEDIATE_NAME is already canonical, then we need to
10921 copy it to the appropriate obstack. */
10922 if (canonical_name == NULL || canonical_name == intermediate_name.c_str ())
10923 name = ((const char *)
10924 obstack_copy0 (&objfile->per_bfd->storage_obstack,
10925 intermediate_name.c_str (),
10926 intermediate_name.length ()));
10928 name = canonical_name;
10935 /* Return the fully qualified name of DIE, based on its DW_AT_name.
10936 If scope qualifiers are appropriate they will be added. The result
10937 will be allocated on the storage_obstack, or NULL if the DIE does
10938 not have a name. NAME may either be from a previous call to
10939 dwarf2_name or NULL.
10941 The output string will be canonicalized (if C++). */
10943 static const char *
10944 dwarf2_full_name (const char *name, struct die_info *die, struct dwarf2_cu *cu)
10946 return dwarf2_compute_name (name, die, cu, 0);
10949 /* Construct a physname for the given DIE in CU. NAME may either be
10950 from a previous call to dwarf2_name or NULL. The result will be
10951 allocated on the objfile_objstack or NULL if the DIE does not have a
10954 The output string will be canonicalized (if C++). */
10956 static const char *
10957 dwarf2_physname (const char *name, struct die_info *die, struct dwarf2_cu *cu)
10959 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
10960 const char *retval, *mangled = NULL, *canon = NULL;
10963 /* In this case dwarf2_compute_name is just a shortcut not building anything
10965 if (!die_needs_namespace (die, cu))
10966 return dwarf2_compute_name (name, die, cu, 1);
10968 mangled = dw2_linkage_name (die, cu);
10970 /* rustc emits invalid values for DW_AT_linkage_name. Ignore these.
10971 See https://github.com/rust-lang/rust/issues/32925. */
10972 if (cu->language == language_rust && mangled != NULL
10973 && strchr (mangled, '{') != NULL)
10976 /* DW_AT_linkage_name is missing in some cases - depend on what GDB
10978 gdb::unique_xmalloc_ptr<char> demangled;
10979 if (mangled != NULL)
10982 if (language_def (cu->language)->la_store_sym_names_in_linkage_form_p)
10984 /* Do nothing (do not demangle the symbol name). */
10986 else if (cu->language == language_go)
10988 /* This is a lie, but we already lie to the caller new_symbol.
10989 new_symbol assumes we return the mangled name.
10990 This just undoes that lie until things are cleaned up. */
10994 /* Use DMGL_RET_DROP for C++ template functions to suppress
10995 their return type. It is easier for GDB users to search
10996 for such functions as `name(params)' than `long name(params)'.
10997 In such case the minimal symbol names do not match the full
10998 symbol names but for template functions there is never a need
10999 to look up their definition from their declaration so
11000 the only disadvantage remains the minimal symbol variant
11001 `long name(params)' does not have the proper inferior type. */
11002 demangled.reset (gdb_demangle (mangled,
11003 (DMGL_PARAMS | DMGL_ANSI
11004 | DMGL_RET_DROP)));
11007 canon = demangled.get ();
11015 if (canon == NULL || check_physname)
11017 const char *physname = dwarf2_compute_name (name, die, cu, 1);
11019 if (canon != NULL && strcmp (physname, canon) != 0)
11021 /* It may not mean a bug in GDB. The compiler could also
11022 compute DW_AT_linkage_name incorrectly. But in such case
11023 GDB would need to be bug-to-bug compatible. */
11025 complaint (_("Computed physname <%s> does not match demangled <%s> "
11026 "(from linkage <%s>) - DIE at %s [in module %s]"),
11027 physname, canon, mangled, sect_offset_str (die->sect_off),
11028 objfile_name (objfile));
11030 /* Prefer DW_AT_linkage_name (in the CANON form) - when it
11031 is available here - over computed PHYSNAME. It is safer
11032 against both buggy GDB and buggy compilers. */
11046 retval = ((const char *)
11047 obstack_copy0 (&objfile->per_bfd->storage_obstack,
11048 retval, strlen (retval)));
11053 /* Inspect DIE in CU for a namespace alias. If one exists, record
11054 a new symbol for it.
11056 Returns 1 if a namespace alias was recorded, 0 otherwise. */
11059 read_namespace_alias (struct die_info *die, struct dwarf2_cu *cu)
11061 struct attribute *attr;
11063 /* If the die does not have a name, this is not a namespace
11065 attr = dwarf2_attr (die, DW_AT_name, cu);
11069 struct die_info *d = die;
11070 struct dwarf2_cu *imported_cu = cu;
11072 /* If the compiler has nested DW_AT_imported_declaration DIEs,
11073 keep inspecting DIEs until we hit the underlying import. */
11074 #define MAX_NESTED_IMPORTED_DECLARATIONS 100
11075 for (num = 0; num < MAX_NESTED_IMPORTED_DECLARATIONS; ++num)
11077 attr = dwarf2_attr (d, DW_AT_import, cu);
11081 d = follow_die_ref (d, attr, &imported_cu);
11082 if (d->tag != DW_TAG_imported_declaration)
11086 if (num == MAX_NESTED_IMPORTED_DECLARATIONS)
11088 complaint (_("DIE at %s has too many recursively imported "
11089 "declarations"), sect_offset_str (d->sect_off));
11096 sect_offset sect_off = dwarf2_get_ref_die_offset (attr);
11098 type = get_die_type_at_offset (sect_off, cu->per_cu);
11099 if (type != NULL && TYPE_CODE (type) == TYPE_CODE_NAMESPACE)
11101 /* This declaration is a global namespace alias. Add
11102 a symbol for it whose type is the aliased namespace. */
11103 new_symbol (die, type, cu);
11112 /* Return the using directives repository (global or local?) to use in the
11113 current context for CU.
11115 For Ada, imported declarations can materialize renamings, which *may* be
11116 global. However it is impossible (for now?) in DWARF to distinguish
11117 "external" imported declarations and "static" ones. As all imported
11118 declarations seem to be static in all other languages, make them all CU-wide
11119 global only in Ada. */
11121 static struct using_direct **
11122 using_directives (struct dwarf2_cu *cu)
11124 if (cu->language == language_ada && cu->builder->outermost_context_p ())
11125 return cu->builder->get_global_using_directives ();
11127 return cu->builder->get_local_using_directives ();
11130 /* Read the import statement specified by the given die and record it. */
11133 read_import_statement (struct die_info *die, struct dwarf2_cu *cu)
11135 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
11136 struct attribute *import_attr;
11137 struct die_info *imported_die, *child_die;
11138 struct dwarf2_cu *imported_cu;
11139 const char *imported_name;
11140 const char *imported_name_prefix;
11141 const char *canonical_name;
11142 const char *import_alias;
11143 const char *imported_declaration = NULL;
11144 const char *import_prefix;
11145 std::vector<const char *> excludes;
11147 import_attr = dwarf2_attr (die, DW_AT_import, cu);
11148 if (import_attr == NULL)
11150 complaint (_("Tag '%s' has no DW_AT_import"),
11151 dwarf_tag_name (die->tag));
11156 imported_die = follow_die_ref_or_sig (die, import_attr, &imported_cu);
11157 imported_name = dwarf2_name (imported_die, imported_cu);
11158 if (imported_name == NULL)
11160 /* GCC bug: https://bugzilla.redhat.com/show_bug.cgi?id=506524
11162 The import in the following code:
11176 <2><51>: Abbrev Number: 3 (DW_TAG_imported_declaration)
11177 <52> DW_AT_decl_file : 1
11178 <53> DW_AT_decl_line : 6
11179 <54> DW_AT_import : <0x75>
11180 <2><58>: Abbrev Number: 4 (DW_TAG_typedef)
11181 <59> DW_AT_name : B
11182 <5b> DW_AT_decl_file : 1
11183 <5c> DW_AT_decl_line : 2
11184 <5d> DW_AT_type : <0x6e>
11186 <1><75>: Abbrev Number: 7 (DW_TAG_base_type)
11187 <76> DW_AT_byte_size : 4
11188 <77> DW_AT_encoding : 5 (signed)
11190 imports the wrong die ( 0x75 instead of 0x58 ).
11191 This case will be ignored until the gcc bug is fixed. */
11195 /* Figure out the local name after import. */
11196 import_alias = dwarf2_name (die, cu);
11198 /* Figure out where the statement is being imported to. */
11199 import_prefix = determine_prefix (die, cu);
11201 /* Figure out what the scope of the imported die is and prepend it
11202 to the name of the imported die. */
11203 imported_name_prefix = determine_prefix (imported_die, imported_cu);
11205 if (imported_die->tag != DW_TAG_namespace
11206 && imported_die->tag != DW_TAG_module)
11208 imported_declaration = imported_name;
11209 canonical_name = imported_name_prefix;
11211 else if (strlen (imported_name_prefix) > 0)
11212 canonical_name = obconcat (&objfile->objfile_obstack,
11213 imported_name_prefix,
11214 (cu->language == language_d ? "." : "::"),
11215 imported_name, (char *) NULL);
11217 canonical_name = imported_name;
11219 if (die->tag == DW_TAG_imported_module && cu->language == language_fortran)
11220 for (child_die = die->child; child_die && child_die->tag;
11221 child_die = sibling_die (child_die))
11223 /* DWARF-4: A Fortran use statement with a “rename list” may be
11224 represented by an imported module entry with an import attribute
11225 referring to the module and owned entries corresponding to those
11226 entities that are renamed as part of being imported. */
11228 if (child_die->tag != DW_TAG_imported_declaration)
11230 complaint (_("child DW_TAG_imported_declaration expected "
11231 "- DIE at %s [in module %s]"),
11232 sect_offset_str (child_die->sect_off),
11233 objfile_name (objfile));
11237 import_attr = dwarf2_attr (child_die, DW_AT_import, cu);
11238 if (import_attr == NULL)
11240 complaint (_("Tag '%s' has no DW_AT_import"),
11241 dwarf_tag_name (child_die->tag));
11246 imported_die = follow_die_ref_or_sig (child_die, import_attr,
11248 imported_name = dwarf2_name (imported_die, imported_cu);
11249 if (imported_name == NULL)
11251 complaint (_("child DW_TAG_imported_declaration has unknown "
11252 "imported name - DIE at %s [in module %s]"),
11253 sect_offset_str (child_die->sect_off),
11254 objfile_name (objfile));
11258 excludes.push_back (imported_name);
11260 process_die (child_die, cu);
11263 add_using_directive (using_directives (cu),
11267 imported_declaration,
11270 &objfile->objfile_obstack);
11273 /* ICC<14 does not output the required DW_AT_declaration on incomplete
11274 types, but gives them a size of zero. Starting with version 14,
11275 ICC is compatible with GCC. */
11278 producer_is_icc_lt_14 (struct dwarf2_cu *cu)
11280 if (!cu->checked_producer)
11281 check_producer (cu);
11283 return cu->producer_is_icc_lt_14;
11286 /* Check for possibly missing DW_AT_comp_dir with relative .debug_line
11287 directory paths. GCC SVN r127613 (new option -fdebug-prefix-map) fixed
11288 this, it was first present in GCC release 4.3.0. */
11291 producer_is_gcc_lt_4_3 (struct dwarf2_cu *cu)
11293 if (!cu->checked_producer)
11294 check_producer (cu);
11296 return cu->producer_is_gcc_lt_4_3;
11299 static file_and_directory
11300 find_file_and_directory (struct die_info *die, struct dwarf2_cu *cu)
11302 file_and_directory res;
11304 /* Find the filename. Do not use dwarf2_name here, since the filename
11305 is not a source language identifier. */
11306 res.name = dwarf2_string_attr (die, DW_AT_name, cu);
11307 res.comp_dir = dwarf2_string_attr (die, DW_AT_comp_dir, cu);
11309 if (res.comp_dir == NULL
11310 && producer_is_gcc_lt_4_3 (cu) && res.name != NULL
11311 && IS_ABSOLUTE_PATH (res.name))
11313 res.comp_dir_storage = ldirname (res.name);
11314 if (!res.comp_dir_storage.empty ())
11315 res.comp_dir = res.comp_dir_storage.c_str ();
11317 if (res.comp_dir != NULL)
11319 /* Irix 6.2 native cc prepends <machine>.: to the compilation
11320 directory, get rid of it. */
11321 const char *cp = strchr (res.comp_dir, ':');
11323 if (cp && cp != res.comp_dir && cp[-1] == '.' && cp[1] == '/')
11324 res.comp_dir = cp + 1;
11327 if (res.name == NULL)
11328 res.name = "<unknown>";
11333 /* Handle DW_AT_stmt_list for a compilation unit.
11334 DIE is the DW_TAG_compile_unit die for CU.
11335 COMP_DIR is the compilation directory. LOWPC is passed to
11336 dwarf_decode_lines. See dwarf_decode_lines comments about it. */
11339 handle_DW_AT_stmt_list (struct die_info *die, struct dwarf2_cu *cu,
11340 const char *comp_dir, CORE_ADDR lowpc) /* ARI: editCase function */
11342 struct dwarf2_per_objfile *dwarf2_per_objfile
11343 = cu->per_cu->dwarf2_per_objfile;
11344 struct objfile *objfile = dwarf2_per_objfile->objfile;
11345 struct attribute *attr;
11346 struct line_header line_header_local;
11347 hashval_t line_header_local_hash;
11349 int decode_mapping;
11351 gdb_assert (! cu->per_cu->is_debug_types);
11353 attr = dwarf2_attr (die, DW_AT_stmt_list, cu);
11357 sect_offset line_offset = (sect_offset) DW_UNSND (attr);
11359 /* The line header hash table is only created if needed (it exists to
11360 prevent redundant reading of the line table for partial_units).
11361 If we're given a partial_unit, we'll need it. If we're given a
11362 compile_unit, then use the line header hash table if it's already
11363 created, but don't create one just yet. */
11365 if (dwarf2_per_objfile->line_header_hash == NULL
11366 && die->tag == DW_TAG_partial_unit)
11368 dwarf2_per_objfile->line_header_hash
11369 = htab_create_alloc_ex (127, line_header_hash_voidp,
11370 line_header_eq_voidp,
11371 free_line_header_voidp,
11372 &objfile->objfile_obstack,
11373 hashtab_obstack_allocate,
11374 dummy_obstack_deallocate);
11377 line_header_local.sect_off = line_offset;
11378 line_header_local.offset_in_dwz = cu->per_cu->is_dwz;
11379 line_header_local_hash = line_header_hash (&line_header_local);
11380 if (dwarf2_per_objfile->line_header_hash != NULL)
11382 slot = htab_find_slot_with_hash (dwarf2_per_objfile->line_header_hash,
11383 &line_header_local,
11384 line_header_local_hash, NO_INSERT);
11386 /* For DW_TAG_compile_unit we need info like symtab::linetable which
11387 is not present in *SLOT (since if there is something in *SLOT then
11388 it will be for a partial_unit). */
11389 if (die->tag == DW_TAG_partial_unit && slot != NULL)
11391 gdb_assert (*slot != NULL);
11392 cu->line_header = (struct line_header *) *slot;
11397 /* dwarf_decode_line_header does not yet provide sufficient information.
11398 We always have to call also dwarf_decode_lines for it. */
11399 line_header_up lh = dwarf_decode_line_header (line_offset, cu);
11403 cu->line_header = lh.release ();
11404 cu->line_header_die_owner = die;
11406 if (dwarf2_per_objfile->line_header_hash == NULL)
11410 slot = htab_find_slot_with_hash (dwarf2_per_objfile->line_header_hash,
11411 &line_header_local,
11412 line_header_local_hash, INSERT);
11413 gdb_assert (slot != NULL);
11415 if (slot != NULL && *slot == NULL)
11417 /* This newly decoded line number information unit will be owned
11418 by line_header_hash hash table. */
11419 *slot = cu->line_header;
11420 cu->line_header_die_owner = NULL;
11424 /* We cannot free any current entry in (*slot) as that struct line_header
11425 may be already used by multiple CUs. Create only temporary decoded
11426 line_header for this CU - it may happen at most once for each line
11427 number information unit. And if we're not using line_header_hash
11428 then this is what we want as well. */
11429 gdb_assert (die->tag != DW_TAG_partial_unit);
11431 decode_mapping = (die->tag != DW_TAG_partial_unit);
11432 dwarf_decode_lines (cu->line_header, comp_dir, cu, NULL, lowpc,
11437 /* Process DW_TAG_compile_unit or DW_TAG_partial_unit. */
11440 read_file_scope (struct die_info *die, struct dwarf2_cu *cu)
11442 struct dwarf2_per_objfile *dwarf2_per_objfile
11443 = cu->per_cu->dwarf2_per_objfile;
11444 struct objfile *objfile = dwarf2_per_objfile->objfile;
11445 struct gdbarch *gdbarch = get_objfile_arch (objfile);
11446 CORE_ADDR lowpc = ((CORE_ADDR) -1);
11447 CORE_ADDR highpc = ((CORE_ADDR) 0);
11448 struct attribute *attr;
11449 struct die_info *child_die;
11450 CORE_ADDR baseaddr;
11452 prepare_one_comp_unit (cu, die, cu->language);
11453 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
11455 get_scope_pc_bounds (die, &lowpc, &highpc, cu);
11457 /* If we didn't find a lowpc, set it to highpc to avoid complaints
11458 from finish_block. */
11459 if (lowpc == ((CORE_ADDR) -1))
11461 lowpc = gdbarch_adjust_dwarf2_addr (gdbarch, lowpc + baseaddr);
11463 file_and_directory fnd = find_file_and_directory (die, cu);
11465 /* The XLCL doesn't generate DW_LANG_OpenCL because this attribute is not
11466 standardised yet. As a workaround for the language detection we fall
11467 back to the DW_AT_producer string. */
11468 if (cu->producer && strstr (cu->producer, "IBM XL C for OpenCL") != NULL)
11469 cu->language = language_opencl;
11471 /* Similar hack for Go. */
11472 if (cu->producer && strstr (cu->producer, "GNU Go ") != NULL)
11473 set_cu_language (DW_LANG_Go, cu);
11475 dwarf2_start_symtab (cu, fnd.name, fnd.comp_dir, lowpc);
11477 /* Decode line number information if present. We do this before
11478 processing child DIEs, so that the line header table is available
11479 for DW_AT_decl_file. */
11480 handle_DW_AT_stmt_list (die, cu, fnd.comp_dir, lowpc);
11482 /* Process all dies in compilation unit. */
11483 if (die->child != NULL)
11485 child_die = die->child;
11486 while (child_die && child_die->tag)
11488 process_die (child_die, cu);
11489 child_die = sibling_die (child_die);
11493 /* Decode macro information, if present. Dwarf 2 macro information
11494 refers to information in the line number info statement program
11495 header, so we can only read it if we've read the header
11497 attr = dwarf2_attr (die, DW_AT_macros, cu);
11499 attr = dwarf2_attr (die, DW_AT_GNU_macros, cu);
11500 if (attr && cu->line_header)
11502 if (dwarf2_attr (die, DW_AT_macro_info, cu))
11503 complaint (_("CU refers to both DW_AT_macros and DW_AT_macro_info"));
11505 dwarf_decode_macros (cu, DW_UNSND (attr), 1);
11509 attr = dwarf2_attr (die, DW_AT_macro_info, cu);
11510 if (attr && cu->line_header)
11512 unsigned int macro_offset = DW_UNSND (attr);
11514 dwarf_decode_macros (cu, macro_offset, 0);
11519 /* TU version of handle_DW_AT_stmt_list for read_type_unit_scope.
11520 Create the set of symtabs used by this TU, or if this TU is sharing
11521 symtabs with another TU and the symtabs have already been created
11522 then restore those symtabs in the line header.
11523 We don't need the pc/line-number mapping for type units. */
11526 setup_type_unit_groups (struct die_info *die, struct dwarf2_cu *cu)
11528 struct dwarf2_per_cu_data *per_cu = cu->per_cu;
11529 struct type_unit_group *tu_group;
11531 struct attribute *attr;
11533 struct signatured_type *sig_type;
11535 gdb_assert (per_cu->is_debug_types);
11536 sig_type = (struct signatured_type *) per_cu;
11538 attr = dwarf2_attr (die, DW_AT_stmt_list, cu);
11540 /* If we're using .gdb_index (includes -readnow) then
11541 per_cu->type_unit_group may not have been set up yet. */
11542 if (sig_type->type_unit_group == NULL)
11543 sig_type->type_unit_group = get_type_unit_group (cu, attr);
11544 tu_group = sig_type->type_unit_group;
11546 /* If we've already processed this stmt_list there's no real need to
11547 do it again, we could fake it and just recreate the part we need
11548 (file name,index -> symtab mapping). If data shows this optimization
11549 is useful we can do it then. */
11550 first_time = tu_group->compunit_symtab == NULL;
11552 /* We have to handle the case of both a missing DW_AT_stmt_list or bad
11557 sect_offset line_offset = (sect_offset) DW_UNSND (attr);
11558 lh = dwarf_decode_line_header (line_offset, cu);
11563 dwarf2_start_symtab (cu, "", NULL, 0);
11566 gdb_assert (tu_group->symtabs == NULL);
11567 gdb_assert (cu->builder == nullptr);
11568 struct compunit_symtab *cust = tu_group->compunit_symtab;
11569 cu->builder.reset (new struct buildsym_compunit
11570 (COMPUNIT_OBJFILE (cust), "",
11571 COMPUNIT_DIRNAME (cust),
11572 compunit_language (cust),
11578 cu->line_header = lh.release ();
11579 cu->line_header_die_owner = die;
11583 struct compunit_symtab *cust = dwarf2_start_symtab (cu, "", NULL, 0);
11585 /* Note: We don't assign tu_group->compunit_symtab yet because we're
11586 still initializing it, and our caller (a few levels up)
11587 process_full_type_unit still needs to know if this is the first
11590 tu_group->num_symtabs = cu->line_header->file_names.size ();
11591 tu_group->symtabs = XNEWVEC (struct symtab *,
11592 cu->line_header->file_names.size ());
11594 for (i = 0; i < cu->line_header->file_names.size (); ++i)
11596 file_entry &fe = cu->line_header->file_names[i];
11598 dwarf2_start_subfile (cu, fe.name, fe.include_dir (cu->line_header));
11600 if (cu->builder->get_current_subfile ()->symtab == NULL)
11602 /* NOTE: start_subfile will recognize when it's been
11603 passed a file it has already seen. So we can't
11604 assume there's a simple mapping from
11605 cu->line_header->file_names to subfiles, plus
11606 cu->line_header->file_names may contain dups. */
11607 cu->builder->get_current_subfile ()->symtab
11608 = allocate_symtab (cust,
11609 cu->builder->get_current_subfile ()->name);
11612 fe.symtab = cu->builder->get_current_subfile ()->symtab;
11613 tu_group->symtabs[i] = fe.symtab;
11618 gdb_assert (cu->builder == nullptr);
11619 struct compunit_symtab *cust = tu_group->compunit_symtab;
11620 cu->builder.reset (new struct buildsym_compunit
11621 (COMPUNIT_OBJFILE (cust), "",
11622 COMPUNIT_DIRNAME (cust),
11623 compunit_language (cust),
11626 for (i = 0; i < cu->line_header->file_names.size (); ++i)
11628 file_entry &fe = cu->line_header->file_names[i];
11630 fe.symtab = tu_group->symtabs[i];
11634 /* The main symtab is allocated last. Type units don't have DW_AT_name
11635 so they don't have a "real" (so to speak) symtab anyway.
11636 There is later code that will assign the main symtab to all symbols
11637 that don't have one. We need to handle the case of a symbol with a
11638 missing symtab (DW_AT_decl_file) anyway. */
11641 /* Process DW_TAG_type_unit.
11642 For TUs we want to skip the first top level sibling if it's not the
11643 actual type being defined by this TU. In this case the first top
11644 level sibling is there to provide context only. */
11647 read_type_unit_scope (struct die_info *die, struct dwarf2_cu *cu)
11649 struct die_info *child_die;
11651 prepare_one_comp_unit (cu, die, language_minimal);
11653 /* Initialize (or reinitialize) the machinery for building symtabs.
11654 We do this before processing child DIEs, so that the line header table
11655 is available for DW_AT_decl_file. */
11656 setup_type_unit_groups (die, cu);
11658 if (die->child != NULL)
11660 child_die = die->child;
11661 while (child_die && child_die->tag)
11663 process_die (child_die, cu);
11664 child_die = sibling_die (child_die);
11671 http://gcc.gnu.org/wiki/DebugFission
11672 http://gcc.gnu.org/wiki/DebugFissionDWP
11674 To simplify handling of both DWO files ("object" files with the DWARF info)
11675 and DWP files (a file with the DWOs packaged up into one file), we treat
11676 DWP files as having a collection of virtual DWO files. */
11679 hash_dwo_file (const void *item)
11681 const struct dwo_file *dwo_file = (const struct dwo_file *) item;
11684 hash = htab_hash_string (dwo_file->dwo_name);
11685 if (dwo_file->comp_dir != NULL)
11686 hash += htab_hash_string (dwo_file->comp_dir);
11691 eq_dwo_file (const void *item_lhs, const void *item_rhs)
11693 const struct dwo_file *lhs = (const struct dwo_file *) item_lhs;
11694 const struct dwo_file *rhs = (const struct dwo_file *) item_rhs;
11696 if (strcmp (lhs->dwo_name, rhs->dwo_name) != 0)
11698 if (lhs->comp_dir == NULL || rhs->comp_dir == NULL)
11699 return lhs->comp_dir == rhs->comp_dir;
11700 return strcmp (lhs->comp_dir, rhs->comp_dir) == 0;
11703 /* Allocate a hash table for DWO files. */
11706 allocate_dwo_file_hash_table (struct objfile *objfile)
11708 return htab_create_alloc_ex (41,
11712 &objfile->objfile_obstack,
11713 hashtab_obstack_allocate,
11714 dummy_obstack_deallocate);
11717 /* Lookup DWO file DWO_NAME. */
11720 lookup_dwo_file_slot (struct dwarf2_per_objfile *dwarf2_per_objfile,
11721 const char *dwo_name,
11722 const char *comp_dir)
11724 struct dwo_file find_entry;
11727 if (dwarf2_per_objfile->dwo_files == NULL)
11728 dwarf2_per_objfile->dwo_files
11729 = allocate_dwo_file_hash_table (dwarf2_per_objfile->objfile);
11731 memset (&find_entry, 0, sizeof (find_entry));
11732 find_entry.dwo_name = dwo_name;
11733 find_entry.comp_dir = comp_dir;
11734 slot = htab_find_slot (dwarf2_per_objfile->dwo_files, &find_entry, INSERT);
11740 hash_dwo_unit (const void *item)
11742 const struct dwo_unit *dwo_unit = (const struct dwo_unit *) item;
11744 /* This drops the top 32 bits of the id, but is ok for a hash. */
11745 return dwo_unit->signature;
11749 eq_dwo_unit (const void *item_lhs, const void *item_rhs)
11751 const struct dwo_unit *lhs = (const struct dwo_unit *) item_lhs;
11752 const struct dwo_unit *rhs = (const struct dwo_unit *) item_rhs;
11754 /* The signature is assumed to be unique within the DWO file.
11755 So while object file CU dwo_id's always have the value zero,
11756 that's OK, assuming each object file DWO file has only one CU,
11757 and that's the rule for now. */
11758 return lhs->signature == rhs->signature;
11761 /* Allocate a hash table for DWO CUs,TUs.
11762 There is one of these tables for each of CUs,TUs for each DWO file. */
11765 allocate_dwo_unit_table (struct objfile *objfile)
11767 /* Start out with a pretty small number.
11768 Generally DWO files contain only one CU and maybe some TUs. */
11769 return htab_create_alloc_ex (3,
11773 &objfile->objfile_obstack,
11774 hashtab_obstack_allocate,
11775 dummy_obstack_deallocate);
11778 /* Structure used to pass data to create_dwo_debug_info_hash_table_reader. */
11780 struct create_dwo_cu_data
11782 struct dwo_file *dwo_file;
11783 struct dwo_unit dwo_unit;
11786 /* die_reader_func for create_dwo_cu. */
11789 create_dwo_cu_reader (const struct die_reader_specs *reader,
11790 const gdb_byte *info_ptr,
11791 struct die_info *comp_unit_die,
11795 struct dwarf2_cu *cu = reader->cu;
11796 sect_offset sect_off = cu->per_cu->sect_off;
11797 struct dwarf2_section_info *section = cu->per_cu->section;
11798 struct create_dwo_cu_data *data = (struct create_dwo_cu_data *) datap;
11799 struct dwo_file *dwo_file = data->dwo_file;
11800 struct dwo_unit *dwo_unit = &data->dwo_unit;
11801 struct attribute *attr;
11803 attr = dwarf2_attr (comp_unit_die, DW_AT_GNU_dwo_id, cu);
11806 complaint (_("Dwarf Error: debug entry at offset %s is missing"
11807 " its dwo_id [in module %s]"),
11808 sect_offset_str (sect_off), dwo_file->dwo_name);
11812 dwo_unit->dwo_file = dwo_file;
11813 dwo_unit->signature = DW_UNSND (attr);
11814 dwo_unit->section = section;
11815 dwo_unit->sect_off = sect_off;
11816 dwo_unit->length = cu->per_cu->length;
11818 if (dwarf_read_debug)
11819 fprintf_unfiltered (gdb_stdlog, " offset %s, dwo_id %s\n",
11820 sect_offset_str (sect_off),
11821 hex_string (dwo_unit->signature));
11824 /* Create the dwo_units for the CUs in a DWO_FILE.
11825 Note: This function processes DWO files only, not DWP files. */
11828 create_cus_hash_table (struct dwarf2_per_objfile *dwarf2_per_objfile,
11829 struct dwo_file &dwo_file, dwarf2_section_info §ion,
11832 struct objfile *objfile = dwarf2_per_objfile->objfile;
11833 const gdb_byte *info_ptr, *end_ptr;
11835 dwarf2_read_section (objfile, §ion);
11836 info_ptr = section.buffer;
11838 if (info_ptr == NULL)
11841 if (dwarf_read_debug)
11843 fprintf_unfiltered (gdb_stdlog, "Reading %s for %s:\n",
11844 get_section_name (§ion),
11845 get_section_file_name (§ion));
11848 end_ptr = info_ptr + section.size;
11849 while (info_ptr < end_ptr)
11851 struct dwarf2_per_cu_data per_cu;
11852 struct create_dwo_cu_data create_dwo_cu_data;
11853 struct dwo_unit *dwo_unit;
11855 sect_offset sect_off = (sect_offset) (info_ptr - section.buffer);
11857 memset (&create_dwo_cu_data.dwo_unit, 0,
11858 sizeof (create_dwo_cu_data.dwo_unit));
11859 memset (&per_cu, 0, sizeof (per_cu));
11860 per_cu.dwarf2_per_objfile = dwarf2_per_objfile;
11861 per_cu.is_debug_types = 0;
11862 per_cu.sect_off = sect_offset (info_ptr - section.buffer);
11863 per_cu.section = §ion;
11864 create_dwo_cu_data.dwo_file = &dwo_file;
11866 init_cutu_and_read_dies_no_follow (
11867 &per_cu, &dwo_file, create_dwo_cu_reader, &create_dwo_cu_data);
11868 info_ptr += per_cu.length;
11870 // If the unit could not be parsed, skip it.
11871 if (create_dwo_cu_data.dwo_unit.dwo_file == NULL)
11874 if (cus_htab == NULL)
11875 cus_htab = allocate_dwo_unit_table (objfile);
11877 dwo_unit = OBSTACK_ZALLOC (&objfile->objfile_obstack, struct dwo_unit);
11878 *dwo_unit = create_dwo_cu_data.dwo_unit;
11879 slot = htab_find_slot (cus_htab, dwo_unit, INSERT);
11880 gdb_assert (slot != NULL);
11883 const struct dwo_unit *dup_cu = (const struct dwo_unit *)*slot;
11884 sect_offset dup_sect_off = dup_cu->sect_off;
11886 complaint (_("debug cu entry at offset %s is duplicate to"
11887 " the entry at offset %s, signature %s"),
11888 sect_offset_str (sect_off), sect_offset_str (dup_sect_off),
11889 hex_string (dwo_unit->signature));
11891 *slot = (void *)dwo_unit;
11895 /* DWP file .debug_{cu,tu}_index section format:
11896 [ref: http://gcc.gnu.org/wiki/DebugFissionDWP]
11900 Both index sections have the same format, and serve to map a 64-bit
11901 signature to a set of section numbers. Each section begins with a header,
11902 followed by a hash table of 64-bit signatures, a parallel table of 32-bit
11903 indexes, and a pool of 32-bit section numbers. The index sections will be
11904 aligned at 8-byte boundaries in the file.
11906 The index section header consists of:
11908 V, 32 bit version number
11910 N, 32 bit number of compilation units or type units in the index
11911 M, 32 bit number of slots in the hash table
11913 Numbers are recorded using the byte order of the application binary.
11915 The hash table begins at offset 16 in the section, and consists of an array
11916 of M 64-bit slots. Each slot contains a 64-bit signature (using the byte
11917 order of the application binary). Unused slots in the hash table are 0.
11918 (We rely on the extreme unlikeliness of a signature being exactly 0.)
11920 The parallel table begins immediately after the hash table
11921 (at offset 16 + 8 * M from the beginning of the section), and consists of an
11922 array of 32-bit indexes (using the byte order of the application binary),
11923 corresponding 1-1 with slots in the hash table. Each entry in the parallel
11924 table contains a 32-bit index into the pool of section numbers. For unused
11925 hash table slots, the corresponding entry in the parallel table will be 0.
11927 The pool of section numbers begins immediately following the hash table
11928 (at offset 16 + 12 * M from the beginning of the section). The pool of
11929 section numbers consists of an array of 32-bit words (using the byte order
11930 of the application binary). Each item in the array is indexed starting
11931 from 0. The hash table entry provides the index of the first section
11932 number in the set. Additional section numbers in the set follow, and the
11933 set is terminated by a 0 entry (section number 0 is not used in ELF).
11935 In each set of section numbers, the .debug_info.dwo or .debug_types.dwo
11936 section must be the first entry in the set, and the .debug_abbrev.dwo must
11937 be the second entry. Other members of the set may follow in any order.
11943 DWP Version 2 combines all the .debug_info, etc. sections into one,
11944 and the entries in the index tables are now offsets into these sections.
11945 CU offsets begin at 0. TU offsets begin at the size of the .debug_info
11948 Index Section Contents:
11950 Hash Table of Signatures dwp_hash_table.hash_table
11951 Parallel Table of Indices dwp_hash_table.unit_table
11952 Table of Section Offsets dwp_hash_table.v2.{section_ids,offsets}
11953 Table of Section Sizes dwp_hash_table.v2.sizes
11955 The index section header consists of:
11957 V, 32 bit version number
11958 L, 32 bit number of columns in the table of section offsets
11959 N, 32 bit number of compilation units or type units in the index
11960 M, 32 bit number of slots in the hash table
11962 Numbers are recorded using the byte order of the application binary.
11964 The hash table has the same format as version 1.
11965 The parallel table of indices has the same format as version 1,
11966 except that the entries are origin-1 indices into the table of sections
11967 offsets and the table of section sizes.
11969 The table of offsets begins immediately following the parallel table
11970 (at offset 16 + 12 * M from the beginning of the section). The table is
11971 a two-dimensional array of 32-bit words (using the byte order of the
11972 application binary), with L columns and N+1 rows, in row-major order.
11973 Each row in the array is indexed starting from 0. The first row provides
11974 a key to the remaining rows: each column in this row provides an identifier
11975 for a debug section, and the offsets in the same column of subsequent rows
11976 refer to that section. The section identifiers are:
11978 DW_SECT_INFO 1 .debug_info.dwo
11979 DW_SECT_TYPES 2 .debug_types.dwo
11980 DW_SECT_ABBREV 3 .debug_abbrev.dwo
11981 DW_SECT_LINE 4 .debug_line.dwo
11982 DW_SECT_LOC 5 .debug_loc.dwo
11983 DW_SECT_STR_OFFSETS 6 .debug_str_offsets.dwo
11984 DW_SECT_MACINFO 7 .debug_macinfo.dwo
11985 DW_SECT_MACRO 8 .debug_macro.dwo
11987 The offsets provided by the CU and TU index sections are the base offsets
11988 for the contributions made by each CU or TU to the corresponding section
11989 in the package file. Each CU and TU header contains an abbrev_offset
11990 field, used to find the abbreviations table for that CU or TU within the
11991 contribution to the .debug_abbrev.dwo section for that CU or TU, and should
11992 be interpreted as relative to the base offset given in the index section.
11993 Likewise, offsets into .debug_line.dwo from DW_AT_stmt_list attributes
11994 should be interpreted as relative to the base offset for .debug_line.dwo,
11995 and offsets into other debug sections obtained from DWARF attributes should
11996 also be interpreted as relative to the corresponding base offset.
11998 The table of sizes begins immediately following the table of offsets.
11999 Like the table of offsets, it is a two-dimensional array of 32-bit words,
12000 with L columns and N rows, in row-major order. Each row in the array is
12001 indexed starting from 1 (row 0 is shared by the two tables).
12005 Hash table lookup is handled the same in version 1 and 2:
12007 We assume that N and M will not exceed 2^32 - 1.
12008 The size of the hash table, M, must be 2^k such that 2^k > 3*N/2.
12010 Given a 64-bit compilation unit signature or a type signature S, an entry
12011 in the hash table is located as follows:
12013 1) Calculate a primary hash H = S & MASK(k), where MASK(k) is a mask with
12014 the low-order k bits all set to 1.
12016 2) Calculate a secondary hash H' = (((S >> 32) & MASK(k)) | 1).
12018 3) If the hash table entry at index H matches the signature, use that
12019 entry. If the hash table entry at index H is unused (all zeroes),
12020 terminate the search: the signature is not present in the table.
12022 4) Let H = (H + H') modulo M. Repeat at Step 3.
12024 Because M > N and H' and M are relatively prime, the search is guaranteed
12025 to stop at an unused slot or find the match. */
12027 /* Create a hash table to map DWO IDs to their CU/TU entry in
12028 .debug_{info,types}.dwo in DWP_FILE.
12029 Returns NULL if there isn't one.
12030 Note: This function processes DWP files only, not DWO files. */
12032 static struct dwp_hash_table *
12033 create_dwp_hash_table (struct dwarf2_per_objfile *dwarf2_per_objfile,
12034 struct dwp_file *dwp_file, int is_debug_types)
12036 struct objfile *objfile = dwarf2_per_objfile->objfile;
12037 bfd *dbfd = dwp_file->dbfd.get ();
12038 const gdb_byte *index_ptr, *index_end;
12039 struct dwarf2_section_info *index;
12040 uint32_t version, nr_columns, nr_units, nr_slots;
12041 struct dwp_hash_table *htab;
12043 if (is_debug_types)
12044 index = &dwp_file->sections.tu_index;
12046 index = &dwp_file->sections.cu_index;
12048 if (dwarf2_section_empty_p (index))
12050 dwarf2_read_section (objfile, index);
12052 index_ptr = index->buffer;
12053 index_end = index_ptr + index->size;
12055 version = read_4_bytes (dbfd, index_ptr);
12058 nr_columns = read_4_bytes (dbfd, index_ptr);
12062 nr_units = read_4_bytes (dbfd, index_ptr);
12064 nr_slots = read_4_bytes (dbfd, index_ptr);
12067 if (version != 1 && version != 2)
12069 error (_("Dwarf Error: unsupported DWP file version (%s)"
12070 " [in module %s]"),
12071 pulongest (version), dwp_file->name);
12073 if (nr_slots != (nr_slots & -nr_slots))
12075 error (_("Dwarf Error: number of slots in DWP hash table (%s)"
12076 " is not power of 2 [in module %s]"),
12077 pulongest (nr_slots), dwp_file->name);
12080 htab = OBSTACK_ZALLOC (&objfile->objfile_obstack, struct dwp_hash_table);
12081 htab->version = version;
12082 htab->nr_columns = nr_columns;
12083 htab->nr_units = nr_units;
12084 htab->nr_slots = nr_slots;
12085 htab->hash_table = index_ptr;
12086 htab->unit_table = htab->hash_table + sizeof (uint64_t) * nr_slots;
12088 /* Exit early if the table is empty. */
12089 if (nr_slots == 0 || nr_units == 0
12090 || (version == 2 && nr_columns == 0))
12092 /* All must be zero. */
12093 if (nr_slots != 0 || nr_units != 0
12094 || (version == 2 && nr_columns != 0))
12096 complaint (_("Empty DWP but nr_slots,nr_units,nr_columns not"
12097 " all zero [in modules %s]"),
12105 htab->section_pool.v1.indices =
12106 htab->unit_table + sizeof (uint32_t) * nr_slots;
12107 /* It's harder to decide whether the section is too small in v1.
12108 V1 is deprecated anyway so we punt. */
12112 const gdb_byte *ids_ptr = htab->unit_table + sizeof (uint32_t) * nr_slots;
12113 int *ids = htab->section_pool.v2.section_ids;
12114 /* Reverse map for error checking. */
12115 int ids_seen[DW_SECT_MAX + 1];
12118 if (nr_columns < 2)
12120 error (_("Dwarf Error: bad DWP hash table, too few columns"
12121 " in section table [in module %s]"),
12124 if (nr_columns > MAX_NR_V2_DWO_SECTIONS)
12126 error (_("Dwarf Error: bad DWP hash table, too many columns"
12127 " in section table [in module %s]"),
12130 memset (ids, 255, (DW_SECT_MAX + 1) * sizeof (int32_t));
12131 memset (ids_seen, 255, (DW_SECT_MAX + 1) * sizeof (int32_t));
12132 for (i = 0; i < nr_columns; ++i)
12134 int id = read_4_bytes (dbfd, ids_ptr + i * sizeof (uint32_t));
12136 if (id < DW_SECT_MIN || id > DW_SECT_MAX)
12138 error (_("Dwarf Error: bad DWP hash table, bad section id %d"
12139 " in section table [in module %s]"),
12140 id, dwp_file->name);
12142 if (ids_seen[id] != -1)
12144 error (_("Dwarf Error: bad DWP hash table, duplicate section"
12145 " id %d in section table [in module %s]"),
12146 id, dwp_file->name);
12151 /* Must have exactly one info or types section. */
12152 if (((ids_seen[DW_SECT_INFO] != -1)
12153 + (ids_seen[DW_SECT_TYPES] != -1))
12156 error (_("Dwarf Error: bad DWP hash table, missing/duplicate"
12157 " DWO info/types section [in module %s]"),
12160 /* Must have an abbrev section. */
12161 if (ids_seen[DW_SECT_ABBREV] == -1)
12163 error (_("Dwarf Error: bad DWP hash table, missing DWO abbrev"
12164 " section [in module %s]"),
12167 htab->section_pool.v2.offsets = ids_ptr + sizeof (uint32_t) * nr_columns;
12168 htab->section_pool.v2.sizes =
12169 htab->section_pool.v2.offsets + (sizeof (uint32_t)
12170 * nr_units * nr_columns);
12171 if ((htab->section_pool.v2.sizes + (sizeof (uint32_t)
12172 * nr_units * nr_columns))
12175 error (_("Dwarf Error: DWP index section is corrupt (too small)"
12176 " [in module %s]"),
12184 /* Update SECTIONS with the data from SECTP.
12186 This function is like the other "locate" section routines that are
12187 passed to bfd_map_over_sections, but in this context the sections to
12188 read comes from the DWP V1 hash table, not the full ELF section table.
12190 The result is non-zero for success, or zero if an error was found. */
12193 locate_v1_virtual_dwo_sections (asection *sectp,
12194 struct virtual_v1_dwo_sections *sections)
12196 const struct dwop_section_names *names = &dwop_section_names;
12198 if (section_is_p (sectp->name, &names->abbrev_dwo))
12200 /* There can be only one. */
12201 if (sections->abbrev.s.section != NULL)
12203 sections->abbrev.s.section = sectp;
12204 sections->abbrev.size = bfd_get_section_size (sectp);
12206 else if (section_is_p (sectp->name, &names->info_dwo)
12207 || section_is_p (sectp->name, &names->types_dwo))
12209 /* There can be only one. */
12210 if (sections->info_or_types.s.section != NULL)
12212 sections->info_or_types.s.section = sectp;
12213 sections->info_or_types.size = bfd_get_section_size (sectp);
12215 else if (section_is_p (sectp->name, &names->line_dwo))
12217 /* There can be only one. */
12218 if (sections->line.s.section != NULL)
12220 sections->line.s.section = sectp;
12221 sections->line.size = bfd_get_section_size (sectp);
12223 else if (section_is_p (sectp->name, &names->loc_dwo))
12225 /* There can be only one. */
12226 if (sections->loc.s.section != NULL)
12228 sections->loc.s.section = sectp;
12229 sections->loc.size = bfd_get_section_size (sectp);
12231 else if (section_is_p (sectp->name, &names->macinfo_dwo))
12233 /* There can be only one. */
12234 if (sections->macinfo.s.section != NULL)
12236 sections->macinfo.s.section = sectp;
12237 sections->macinfo.size = bfd_get_section_size (sectp);
12239 else if (section_is_p (sectp->name, &names->macro_dwo))
12241 /* There can be only one. */
12242 if (sections->macro.s.section != NULL)
12244 sections->macro.s.section = sectp;
12245 sections->macro.size = bfd_get_section_size (sectp);
12247 else if (section_is_p (sectp->name, &names->str_offsets_dwo))
12249 /* There can be only one. */
12250 if (sections->str_offsets.s.section != NULL)
12252 sections->str_offsets.s.section = sectp;
12253 sections->str_offsets.size = bfd_get_section_size (sectp);
12257 /* No other kind of section is valid. */
12264 /* Create a dwo_unit object for the DWO unit with signature SIGNATURE.
12265 UNIT_INDEX is the index of the DWO unit in the DWP hash table.
12266 COMP_DIR is the DW_AT_comp_dir attribute of the referencing CU.
12267 This is for DWP version 1 files. */
12269 static struct dwo_unit *
12270 create_dwo_unit_in_dwp_v1 (struct dwarf2_per_objfile *dwarf2_per_objfile,
12271 struct dwp_file *dwp_file,
12272 uint32_t unit_index,
12273 const char *comp_dir,
12274 ULONGEST signature, int is_debug_types)
12276 struct objfile *objfile = dwarf2_per_objfile->objfile;
12277 const struct dwp_hash_table *dwp_htab =
12278 is_debug_types ? dwp_file->tus : dwp_file->cus;
12279 bfd *dbfd = dwp_file->dbfd.get ();
12280 const char *kind = is_debug_types ? "TU" : "CU";
12281 struct dwo_file *dwo_file;
12282 struct dwo_unit *dwo_unit;
12283 struct virtual_v1_dwo_sections sections;
12284 void **dwo_file_slot;
12287 gdb_assert (dwp_file->version == 1);
12289 if (dwarf_read_debug)
12291 fprintf_unfiltered (gdb_stdlog, "Reading %s %s/%s in DWP V1 file: %s\n",
12293 pulongest (unit_index), hex_string (signature),
12297 /* Fetch the sections of this DWO unit.
12298 Put a limit on the number of sections we look for so that bad data
12299 doesn't cause us to loop forever. */
12301 #define MAX_NR_V1_DWO_SECTIONS \
12302 (1 /* .debug_info or .debug_types */ \
12303 + 1 /* .debug_abbrev */ \
12304 + 1 /* .debug_line */ \
12305 + 1 /* .debug_loc */ \
12306 + 1 /* .debug_str_offsets */ \
12307 + 1 /* .debug_macro or .debug_macinfo */ \
12308 + 1 /* trailing zero */)
12310 memset (§ions, 0, sizeof (sections));
12312 for (i = 0; i < MAX_NR_V1_DWO_SECTIONS; ++i)
12315 uint32_t section_nr =
12316 read_4_bytes (dbfd,
12317 dwp_htab->section_pool.v1.indices
12318 + (unit_index + i) * sizeof (uint32_t));
12320 if (section_nr == 0)
12322 if (section_nr >= dwp_file->num_sections)
12324 error (_("Dwarf Error: bad DWP hash table, section number too large"
12325 " [in module %s]"),
12329 sectp = dwp_file->elf_sections[section_nr];
12330 if (! locate_v1_virtual_dwo_sections (sectp, §ions))
12332 error (_("Dwarf Error: bad DWP hash table, invalid section found"
12333 " [in module %s]"),
12339 || dwarf2_section_empty_p (§ions.info_or_types)
12340 || dwarf2_section_empty_p (§ions.abbrev))
12342 error (_("Dwarf Error: bad DWP hash table, missing DWO sections"
12343 " [in module %s]"),
12346 if (i == MAX_NR_V1_DWO_SECTIONS)
12348 error (_("Dwarf Error: bad DWP hash table, too many DWO sections"
12349 " [in module %s]"),
12353 /* It's easier for the rest of the code if we fake a struct dwo_file and
12354 have dwo_unit "live" in that. At least for now.
12356 The DWP file can be made up of a random collection of CUs and TUs.
12357 However, for each CU + set of TUs that came from the same original DWO
12358 file, we can combine them back into a virtual DWO file to save space
12359 (fewer struct dwo_file objects to allocate). Remember that for really
12360 large apps there can be on the order of 8K CUs and 200K TUs, or more. */
12362 std::string virtual_dwo_name =
12363 string_printf ("virtual-dwo/%d-%d-%d-%d",
12364 get_section_id (§ions.abbrev),
12365 get_section_id (§ions.line),
12366 get_section_id (§ions.loc),
12367 get_section_id (§ions.str_offsets));
12368 /* Can we use an existing virtual DWO file? */
12369 dwo_file_slot = lookup_dwo_file_slot (dwarf2_per_objfile,
12370 virtual_dwo_name.c_str (),
12372 /* Create one if necessary. */
12373 if (*dwo_file_slot == NULL)
12375 if (dwarf_read_debug)
12377 fprintf_unfiltered (gdb_stdlog, "Creating virtual DWO: %s\n",
12378 virtual_dwo_name.c_str ());
12380 dwo_file = OBSTACK_ZALLOC (&objfile->objfile_obstack, struct dwo_file);
12382 = (const char *) obstack_copy0 (&objfile->objfile_obstack,
12383 virtual_dwo_name.c_str (),
12384 virtual_dwo_name.size ());
12385 dwo_file->comp_dir = comp_dir;
12386 dwo_file->sections.abbrev = sections.abbrev;
12387 dwo_file->sections.line = sections.line;
12388 dwo_file->sections.loc = sections.loc;
12389 dwo_file->sections.macinfo = sections.macinfo;
12390 dwo_file->sections.macro = sections.macro;
12391 dwo_file->sections.str_offsets = sections.str_offsets;
12392 /* The "str" section is global to the entire DWP file. */
12393 dwo_file->sections.str = dwp_file->sections.str;
12394 /* The info or types section is assigned below to dwo_unit,
12395 there's no need to record it in dwo_file.
12396 Also, we can't simply record type sections in dwo_file because
12397 we record a pointer into the vector in dwo_unit. As we collect more
12398 types we'll grow the vector and eventually have to reallocate space
12399 for it, invalidating all copies of pointers into the previous
12401 *dwo_file_slot = dwo_file;
12405 if (dwarf_read_debug)
12407 fprintf_unfiltered (gdb_stdlog, "Using existing virtual DWO: %s\n",
12408 virtual_dwo_name.c_str ());
12410 dwo_file = (struct dwo_file *) *dwo_file_slot;
12413 dwo_unit = OBSTACK_ZALLOC (&objfile->objfile_obstack, struct dwo_unit);
12414 dwo_unit->dwo_file = dwo_file;
12415 dwo_unit->signature = signature;
12416 dwo_unit->section =
12417 XOBNEW (&objfile->objfile_obstack, struct dwarf2_section_info);
12418 *dwo_unit->section = sections.info_or_types;
12419 /* dwo_unit->{offset,length,type_offset_in_tu} are set later. */
12424 /* Subroutine of create_dwo_unit_in_dwp_v2 to simplify it.
12425 Given a pointer to the containing section SECTION, and OFFSET,SIZE of the
12426 piece within that section used by a TU/CU, return a virtual section
12427 of just that piece. */
12429 static struct dwarf2_section_info
12430 create_dwp_v2_section (struct dwarf2_per_objfile *dwarf2_per_objfile,
12431 struct dwarf2_section_info *section,
12432 bfd_size_type offset, bfd_size_type size)
12434 struct dwarf2_section_info result;
12437 gdb_assert (section != NULL);
12438 gdb_assert (!section->is_virtual);
12440 memset (&result, 0, sizeof (result));
12441 result.s.containing_section = section;
12442 result.is_virtual = 1;
12447 sectp = get_section_bfd_section (section);
12449 /* Flag an error if the piece denoted by OFFSET,SIZE is outside the
12450 bounds of the real section. This is a pretty-rare event, so just
12451 flag an error (easier) instead of a warning and trying to cope. */
12453 || offset + size > bfd_get_section_size (sectp))
12455 error (_("Dwarf Error: Bad DWP V2 section info, doesn't fit"
12456 " in section %s [in module %s]"),
12457 sectp ? bfd_section_name (abfd, sectp) : "<unknown>",
12458 objfile_name (dwarf2_per_objfile->objfile));
12461 result.virtual_offset = offset;
12462 result.size = size;
12466 /* Create a dwo_unit object for the DWO unit with signature SIGNATURE.
12467 UNIT_INDEX is the index of the DWO unit in the DWP hash table.
12468 COMP_DIR is the DW_AT_comp_dir attribute of the referencing CU.
12469 This is for DWP version 2 files. */
12471 static struct dwo_unit *
12472 create_dwo_unit_in_dwp_v2 (struct dwarf2_per_objfile *dwarf2_per_objfile,
12473 struct dwp_file *dwp_file,
12474 uint32_t unit_index,
12475 const char *comp_dir,
12476 ULONGEST signature, int is_debug_types)
12478 struct objfile *objfile = dwarf2_per_objfile->objfile;
12479 const struct dwp_hash_table *dwp_htab =
12480 is_debug_types ? dwp_file->tus : dwp_file->cus;
12481 bfd *dbfd = dwp_file->dbfd.get ();
12482 const char *kind = is_debug_types ? "TU" : "CU";
12483 struct dwo_file *dwo_file;
12484 struct dwo_unit *dwo_unit;
12485 struct virtual_v2_dwo_sections sections;
12486 void **dwo_file_slot;
12489 gdb_assert (dwp_file->version == 2);
12491 if (dwarf_read_debug)
12493 fprintf_unfiltered (gdb_stdlog, "Reading %s %s/%s in DWP V2 file: %s\n",
12495 pulongest (unit_index), hex_string (signature),
12499 /* Fetch the section offsets of this DWO unit. */
12501 memset (§ions, 0, sizeof (sections));
12503 for (i = 0; i < dwp_htab->nr_columns; ++i)
12505 uint32_t offset = read_4_bytes (dbfd,
12506 dwp_htab->section_pool.v2.offsets
12507 + (((unit_index - 1) * dwp_htab->nr_columns
12509 * sizeof (uint32_t)));
12510 uint32_t size = read_4_bytes (dbfd,
12511 dwp_htab->section_pool.v2.sizes
12512 + (((unit_index - 1) * dwp_htab->nr_columns
12514 * sizeof (uint32_t)));
12516 switch (dwp_htab->section_pool.v2.section_ids[i])
12519 case DW_SECT_TYPES:
12520 sections.info_or_types_offset = offset;
12521 sections.info_or_types_size = size;
12523 case DW_SECT_ABBREV:
12524 sections.abbrev_offset = offset;
12525 sections.abbrev_size = size;
12528 sections.line_offset = offset;
12529 sections.line_size = size;
12532 sections.loc_offset = offset;
12533 sections.loc_size = size;
12535 case DW_SECT_STR_OFFSETS:
12536 sections.str_offsets_offset = offset;
12537 sections.str_offsets_size = size;
12539 case DW_SECT_MACINFO:
12540 sections.macinfo_offset = offset;
12541 sections.macinfo_size = size;
12543 case DW_SECT_MACRO:
12544 sections.macro_offset = offset;
12545 sections.macro_size = size;
12550 /* It's easier for the rest of the code if we fake a struct dwo_file and
12551 have dwo_unit "live" in that. At least for now.
12553 The DWP file can be made up of a random collection of CUs and TUs.
12554 However, for each CU + set of TUs that came from the same original DWO
12555 file, we can combine them back into a virtual DWO file to save space
12556 (fewer struct dwo_file objects to allocate). Remember that for really
12557 large apps there can be on the order of 8K CUs and 200K TUs, or more. */
12559 std::string virtual_dwo_name =
12560 string_printf ("virtual-dwo/%ld-%ld-%ld-%ld",
12561 (long) (sections.abbrev_size ? sections.abbrev_offset : 0),
12562 (long) (sections.line_size ? sections.line_offset : 0),
12563 (long) (sections.loc_size ? sections.loc_offset : 0),
12564 (long) (sections.str_offsets_size
12565 ? sections.str_offsets_offset : 0));
12566 /* Can we use an existing virtual DWO file? */
12567 dwo_file_slot = lookup_dwo_file_slot (dwarf2_per_objfile,
12568 virtual_dwo_name.c_str (),
12570 /* Create one if necessary. */
12571 if (*dwo_file_slot == NULL)
12573 if (dwarf_read_debug)
12575 fprintf_unfiltered (gdb_stdlog, "Creating virtual DWO: %s\n",
12576 virtual_dwo_name.c_str ());
12578 dwo_file = OBSTACK_ZALLOC (&objfile->objfile_obstack, struct dwo_file);
12580 = (const char *) obstack_copy0 (&objfile->objfile_obstack,
12581 virtual_dwo_name.c_str (),
12582 virtual_dwo_name.size ());
12583 dwo_file->comp_dir = comp_dir;
12584 dwo_file->sections.abbrev =
12585 create_dwp_v2_section (dwarf2_per_objfile, &dwp_file->sections.abbrev,
12586 sections.abbrev_offset, sections.abbrev_size);
12587 dwo_file->sections.line =
12588 create_dwp_v2_section (dwarf2_per_objfile, &dwp_file->sections.line,
12589 sections.line_offset, sections.line_size);
12590 dwo_file->sections.loc =
12591 create_dwp_v2_section (dwarf2_per_objfile, &dwp_file->sections.loc,
12592 sections.loc_offset, sections.loc_size);
12593 dwo_file->sections.macinfo =
12594 create_dwp_v2_section (dwarf2_per_objfile, &dwp_file->sections.macinfo,
12595 sections.macinfo_offset, sections.macinfo_size);
12596 dwo_file->sections.macro =
12597 create_dwp_v2_section (dwarf2_per_objfile, &dwp_file->sections.macro,
12598 sections.macro_offset, sections.macro_size);
12599 dwo_file->sections.str_offsets =
12600 create_dwp_v2_section (dwarf2_per_objfile,
12601 &dwp_file->sections.str_offsets,
12602 sections.str_offsets_offset,
12603 sections.str_offsets_size);
12604 /* The "str" section is global to the entire DWP file. */
12605 dwo_file->sections.str = dwp_file->sections.str;
12606 /* The info or types section is assigned below to dwo_unit,
12607 there's no need to record it in dwo_file.
12608 Also, we can't simply record type sections in dwo_file because
12609 we record a pointer into the vector in dwo_unit. As we collect more
12610 types we'll grow the vector and eventually have to reallocate space
12611 for it, invalidating all copies of pointers into the previous
12613 *dwo_file_slot = dwo_file;
12617 if (dwarf_read_debug)
12619 fprintf_unfiltered (gdb_stdlog, "Using existing virtual DWO: %s\n",
12620 virtual_dwo_name.c_str ());
12622 dwo_file = (struct dwo_file *) *dwo_file_slot;
12625 dwo_unit = OBSTACK_ZALLOC (&objfile->objfile_obstack, struct dwo_unit);
12626 dwo_unit->dwo_file = dwo_file;
12627 dwo_unit->signature = signature;
12628 dwo_unit->section =
12629 XOBNEW (&objfile->objfile_obstack, struct dwarf2_section_info);
12630 *dwo_unit->section = create_dwp_v2_section (dwarf2_per_objfile,
12632 ? &dwp_file->sections.types
12633 : &dwp_file->sections.info,
12634 sections.info_or_types_offset,
12635 sections.info_or_types_size);
12636 /* dwo_unit->{offset,length,type_offset_in_tu} are set later. */
12641 /* Lookup the DWO unit with SIGNATURE in DWP_FILE.
12642 Returns NULL if the signature isn't found. */
12644 static struct dwo_unit *
12645 lookup_dwo_unit_in_dwp (struct dwarf2_per_objfile *dwarf2_per_objfile,
12646 struct dwp_file *dwp_file, const char *comp_dir,
12647 ULONGEST signature, int is_debug_types)
12649 const struct dwp_hash_table *dwp_htab =
12650 is_debug_types ? dwp_file->tus : dwp_file->cus;
12651 bfd *dbfd = dwp_file->dbfd.get ();
12652 uint32_t mask = dwp_htab->nr_slots - 1;
12653 uint32_t hash = signature & mask;
12654 uint32_t hash2 = ((signature >> 32) & mask) | 1;
12657 struct dwo_unit find_dwo_cu;
12659 memset (&find_dwo_cu, 0, sizeof (find_dwo_cu));
12660 find_dwo_cu.signature = signature;
12661 slot = htab_find_slot (is_debug_types
12662 ? dwp_file->loaded_tus
12663 : dwp_file->loaded_cus,
12664 &find_dwo_cu, INSERT);
12667 return (struct dwo_unit *) *slot;
12669 /* Use a for loop so that we don't loop forever on bad debug info. */
12670 for (i = 0; i < dwp_htab->nr_slots; ++i)
12672 ULONGEST signature_in_table;
12674 signature_in_table =
12675 read_8_bytes (dbfd, dwp_htab->hash_table + hash * sizeof (uint64_t));
12676 if (signature_in_table == signature)
12678 uint32_t unit_index =
12679 read_4_bytes (dbfd,
12680 dwp_htab->unit_table + hash * sizeof (uint32_t));
12682 if (dwp_file->version == 1)
12684 *slot = create_dwo_unit_in_dwp_v1 (dwarf2_per_objfile,
12685 dwp_file, unit_index,
12686 comp_dir, signature,
12691 *slot = create_dwo_unit_in_dwp_v2 (dwarf2_per_objfile,
12692 dwp_file, unit_index,
12693 comp_dir, signature,
12696 return (struct dwo_unit *) *slot;
12698 if (signature_in_table == 0)
12700 hash = (hash + hash2) & mask;
12703 error (_("Dwarf Error: bad DWP hash table, lookup didn't terminate"
12704 " [in module %s]"),
12708 /* Subroutine of open_dwo_file,open_dwp_file to simplify them.
12709 Open the file specified by FILE_NAME and hand it off to BFD for
12710 preliminary analysis. Return a newly initialized bfd *, which
12711 includes a canonicalized copy of FILE_NAME.
12712 If IS_DWP is TRUE, we're opening a DWP file, otherwise a DWO file.
12713 SEARCH_CWD is true if the current directory is to be searched.
12714 It will be searched before debug-file-directory.
12715 If successful, the file is added to the bfd include table of the
12716 objfile's bfd (see gdb_bfd_record_inclusion).
12717 If unable to find/open the file, return NULL.
12718 NOTE: This function is derived from symfile_bfd_open. */
12720 static gdb_bfd_ref_ptr
12721 try_open_dwop_file (struct dwarf2_per_objfile *dwarf2_per_objfile,
12722 const char *file_name, int is_dwp, int search_cwd)
12725 /* Blech. OPF_TRY_CWD_FIRST also disables searching the path list if
12726 FILE_NAME contains a '/'. So we can't use it. Instead prepend "."
12727 to debug_file_directory. */
12728 const char *search_path;
12729 static const char dirname_separator_string[] = { DIRNAME_SEPARATOR, '\0' };
12731 gdb::unique_xmalloc_ptr<char> search_path_holder;
12734 if (*debug_file_directory != '\0')
12736 search_path_holder.reset (concat (".", dirname_separator_string,
12737 debug_file_directory,
12739 search_path = search_path_holder.get ();
12745 search_path = debug_file_directory;
12747 openp_flags flags = OPF_RETURN_REALPATH;
12749 flags |= OPF_SEARCH_IN_PATH;
12751 gdb::unique_xmalloc_ptr<char> absolute_name;
12752 desc = openp (search_path, flags, file_name,
12753 O_RDONLY | O_BINARY, &absolute_name);
12757 gdb_bfd_ref_ptr sym_bfd (gdb_bfd_open (absolute_name.get (),
12759 if (sym_bfd == NULL)
12761 bfd_set_cacheable (sym_bfd.get (), 1);
12763 if (!bfd_check_format (sym_bfd.get (), bfd_object))
12766 /* Success. Record the bfd as having been included by the objfile's bfd.
12767 This is important because things like demangled_names_hash lives in the
12768 objfile's per_bfd space and may have references to things like symbol
12769 names that live in the DWO/DWP file's per_bfd space. PR 16426. */
12770 gdb_bfd_record_inclusion (dwarf2_per_objfile->objfile->obfd, sym_bfd.get ());
12775 /* Try to open DWO file FILE_NAME.
12776 COMP_DIR is the DW_AT_comp_dir attribute.
12777 The result is the bfd handle of the file.
12778 If there is a problem finding or opening the file, return NULL.
12779 Upon success, the canonicalized path of the file is stored in the bfd,
12780 same as symfile_bfd_open. */
12782 static gdb_bfd_ref_ptr
12783 open_dwo_file (struct dwarf2_per_objfile *dwarf2_per_objfile,
12784 const char *file_name, const char *comp_dir)
12786 if (IS_ABSOLUTE_PATH (file_name))
12787 return try_open_dwop_file (dwarf2_per_objfile, file_name,
12788 0 /*is_dwp*/, 0 /*search_cwd*/);
12790 /* Before trying the search path, try DWO_NAME in COMP_DIR. */
12792 if (comp_dir != NULL)
12794 char *path_to_try = concat (comp_dir, SLASH_STRING,
12795 file_name, (char *) NULL);
12797 /* NOTE: If comp_dir is a relative path, this will also try the
12798 search path, which seems useful. */
12799 gdb_bfd_ref_ptr abfd (try_open_dwop_file (dwarf2_per_objfile,
12802 1 /*search_cwd*/));
12803 xfree (path_to_try);
12808 /* That didn't work, try debug-file-directory, which, despite its name,
12809 is a list of paths. */
12811 if (*debug_file_directory == '\0')
12814 return try_open_dwop_file (dwarf2_per_objfile, file_name,
12815 0 /*is_dwp*/, 1 /*search_cwd*/);
12818 /* This function is mapped across the sections and remembers the offset and
12819 size of each of the DWO debugging sections we are interested in. */
12822 dwarf2_locate_dwo_sections (bfd *abfd, asection *sectp, void *dwo_sections_ptr)
12824 struct dwo_sections *dwo_sections = (struct dwo_sections *) dwo_sections_ptr;
12825 const struct dwop_section_names *names = &dwop_section_names;
12827 if (section_is_p (sectp->name, &names->abbrev_dwo))
12829 dwo_sections->abbrev.s.section = sectp;
12830 dwo_sections->abbrev.size = bfd_get_section_size (sectp);
12832 else if (section_is_p (sectp->name, &names->info_dwo))
12834 dwo_sections->info.s.section = sectp;
12835 dwo_sections->info.size = bfd_get_section_size (sectp);
12837 else if (section_is_p (sectp->name, &names->line_dwo))
12839 dwo_sections->line.s.section = sectp;
12840 dwo_sections->line.size = bfd_get_section_size (sectp);
12842 else if (section_is_p (sectp->name, &names->loc_dwo))
12844 dwo_sections->loc.s.section = sectp;
12845 dwo_sections->loc.size = bfd_get_section_size (sectp);
12847 else if (section_is_p (sectp->name, &names->macinfo_dwo))
12849 dwo_sections->macinfo.s.section = sectp;
12850 dwo_sections->macinfo.size = bfd_get_section_size (sectp);
12852 else if (section_is_p (sectp->name, &names->macro_dwo))
12854 dwo_sections->macro.s.section = sectp;
12855 dwo_sections->macro.size = bfd_get_section_size (sectp);
12857 else if (section_is_p (sectp->name, &names->str_dwo))
12859 dwo_sections->str.s.section = sectp;
12860 dwo_sections->str.size = bfd_get_section_size (sectp);
12862 else if (section_is_p (sectp->name, &names->str_offsets_dwo))
12864 dwo_sections->str_offsets.s.section = sectp;
12865 dwo_sections->str_offsets.size = bfd_get_section_size (sectp);
12867 else if (section_is_p (sectp->name, &names->types_dwo))
12869 struct dwarf2_section_info type_section;
12871 memset (&type_section, 0, sizeof (type_section));
12872 type_section.s.section = sectp;
12873 type_section.size = bfd_get_section_size (sectp);
12874 VEC_safe_push (dwarf2_section_info_def, dwo_sections->types,
12879 /* Initialize the use of the DWO file specified by DWO_NAME and referenced
12880 by PER_CU. This is for the non-DWP case.
12881 The result is NULL if DWO_NAME can't be found. */
12883 static struct dwo_file *
12884 open_and_init_dwo_file (struct dwarf2_per_cu_data *per_cu,
12885 const char *dwo_name, const char *comp_dir)
12887 struct dwarf2_per_objfile *dwarf2_per_objfile = per_cu->dwarf2_per_objfile;
12888 struct objfile *objfile = dwarf2_per_objfile->objfile;
12890 gdb_bfd_ref_ptr dbfd (open_dwo_file (dwarf2_per_objfile, dwo_name, comp_dir));
12893 if (dwarf_read_debug)
12894 fprintf_unfiltered (gdb_stdlog, "DWO file not found: %s\n", dwo_name);
12898 /* We use a unique pointer here, despite the obstack allocation,
12899 because a dwo_file needs some cleanup if it is abandoned. */
12900 dwo_file_up dwo_file (OBSTACK_ZALLOC (&objfile->objfile_obstack,
12902 dwo_file->dwo_name = dwo_name;
12903 dwo_file->comp_dir = comp_dir;
12904 dwo_file->dbfd = dbfd.release ();
12906 bfd_map_over_sections (dwo_file->dbfd, dwarf2_locate_dwo_sections,
12907 &dwo_file->sections);
12909 create_cus_hash_table (dwarf2_per_objfile, *dwo_file, dwo_file->sections.info,
12912 create_debug_types_hash_table (dwarf2_per_objfile, dwo_file.get (),
12913 dwo_file->sections.types, dwo_file->tus);
12915 if (dwarf_read_debug)
12916 fprintf_unfiltered (gdb_stdlog, "DWO file found: %s\n", dwo_name);
12918 return dwo_file.release ();
12921 /* This function is mapped across the sections and remembers the offset and
12922 size of each of the DWP debugging sections common to version 1 and 2 that
12923 we are interested in. */
12926 dwarf2_locate_common_dwp_sections (bfd *abfd, asection *sectp,
12927 void *dwp_file_ptr)
12929 struct dwp_file *dwp_file = (struct dwp_file *) dwp_file_ptr;
12930 const struct dwop_section_names *names = &dwop_section_names;
12931 unsigned int elf_section_nr = elf_section_data (sectp)->this_idx;
12933 /* Record the ELF section number for later lookup: this is what the
12934 .debug_cu_index,.debug_tu_index tables use in DWP V1. */
12935 gdb_assert (elf_section_nr < dwp_file->num_sections);
12936 dwp_file->elf_sections[elf_section_nr] = sectp;
12938 /* Look for specific sections that we need. */
12939 if (section_is_p (sectp->name, &names->str_dwo))
12941 dwp_file->sections.str.s.section = sectp;
12942 dwp_file->sections.str.size = bfd_get_section_size (sectp);
12944 else if (section_is_p (sectp->name, &names->cu_index))
12946 dwp_file->sections.cu_index.s.section = sectp;
12947 dwp_file->sections.cu_index.size = bfd_get_section_size (sectp);
12949 else if (section_is_p (sectp->name, &names->tu_index))
12951 dwp_file->sections.tu_index.s.section = sectp;
12952 dwp_file->sections.tu_index.size = bfd_get_section_size (sectp);
12956 /* This function is mapped across the sections and remembers the offset and
12957 size of each of the DWP version 2 debugging sections that we are interested
12958 in. This is split into a separate function because we don't know if we
12959 have version 1 or 2 until we parse the cu_index/tu_index sections. */
12962 dwarf2_locate_v2_dwp_sections (bfd *abfd, asection *sectp, void *dwp_file_ptr)
12964 struct dwp_file *dwp_file = (struct dwp_file *) dwp_file_ptr;
12965 const struct dwop_section_names *names = &dwop_section_names;
12966 unsigned int elf_section_nr = elf_section_data (sectp)->this_idx;
12968 /* Record the ELF section number for later lookup: this is what the
12969 .debug_cu_index,.debug_tu_index tables use in DWP V1. */
12970 gdb_assert (elf_section_nr < dwp_file->num_sections);
12971 dwp_file->elf_sections[elf_section_nr] = sectp;
12973 /* Look for specific sections that we need. */
12974 if (section_is_p (sectp->name, &names->abbrev_dwo))
12976 dwp_file->sections.abbrev.s.section = sectp;
12977 dwp_file->sections.abbrev.size = bfd_get_section_size (sectp);
12979 else if (section_is_p (sectp->name, &names->info_dwo))
12981 dwp_file->sections.info.s.section = sectp;
12982 dwp_file->sections.info.size = bfd_get_section_size (sectp);
12984 else if (section_is_p (sectp->name, &names->line_dwo))
12986 dwp_file->sections.line.s.section = sectp;
12987 dwp_file->sections.line.size = bfd_get_section_size (sectp);
12989 else if (section_is_p (sectp->name, &names->loc_dwo))
12991 dwp_file->sections.loc.s.section = sectp;
12992 dwp_file->sections.loc.size = bfd_get_section_size (sectp);
12994 else if (section_is_p (sectp->name, &names->macinfo_dwo))
12996 dwp_file->sections.macinfo.s.section = sectp;
12997 dwp_file->sections.macinfo.size = bfd_get_section_size (sectp);
12999 else if (section_is_p (sectp->name, &names->macro_dwo))
13001 dwp_file->sections.macro.s.section = sectp;
13002 dwp_file->sections.macro.size = bfd_get_section_size (sectp);
13004 else if (section_is_p (sectp->name, &names->str_offsets_dwo))
13006 dwp_file->sections.str_offsets.s.section = sectp;
13007 dwp_file->sections.str_offsets.size = bfd_get_section_size (sectp);
13009 else if (section_is_p (sectp->name, &names->types_dwo))
13011 dwp_file->sections.types.s.section = sectp;
13012 dwp_file->sections.types.size = bfd_get_section_size (sectp);
13016 /* Hash function for dwp_file loaded CUs/TUs. */
13019 hash_dwp_loaded_cutus (const void *item)
13021 const struct dwo_unit *dwo_unit = (const struct dwo_unit *) item;
13023 /* This drops the top 32 bits of the signature, but is ok for a hash. */
13024 return dwo_unit->signature;
13027 /* Equality function for dwp_file loaded CUs/TUs. */
13030 eq_dwp_loaded_cutus (const void *a, const void *b)
13032 const struct dwo_unit *dua = (const struct dwo_unit *) a;
13033 const struct dwo_unit *dub = (const struct dwo_unit *) b;
13035 return dua->signature == dub->signature;
13038 /* Allocate a hash table for dwp_file loaded CUs/TUs. */
13041 allocate_dwp_loaded_cutus_table (struct objfile *objfile)
13043 return htab_create_alloc_ex (3,
13044 hash_dwp_loaded_cutus,
13045 eq_dwp_loaded_cutus,
13047 &objfile->objfile_obstack,
13048 hashtab_obstack_allocate,
13049 dummy_obstack_deallocate);
13052 /* Try to open DWP file FILE_NAME.
13053 The result is the bfd handle of the file.
13054 If there is a problem finding or opening the file, return NULL.
13055 Upon success, the canonicalized path of the file is stored in the bfd,
13056 same as symfile_bfd_open. */
13058 static gdb_bfd_ref_ptr
13059 open_dwp_file (struct dwarf2_per_objfile *dwarf2_per_objfile,
13060 const char *file_name)
13062 gdb_bfd_ref_ptr abfd (try_open_dwop_file (dwarf2_per_objfile, file_name,
13064 1 /*search_cwd*/));
13068 /* Work around upstream bug 15652.
13069 http://sourceware.org/bugzilla/show_bug.cgi?id=15652
13070 [Whether that's a "bug" is debatable, but it is getting in our way.]
13071 We have no real idea where the dwp file is, because gdb's realpath-ing
13072 of the executable's path may have discarded the needed info.
13073 [IWBN if the dwp file name was recorded in the executable, akin to
13074 .gnu_debuglink, but that doesn't exist yet.]
13075 Strip the directory from FILE_NAME and search again. */
13076 if (*debug_file_directory != '\0')
13078 /* Don't implicitly search the current directory here.
13079 If the user wants to search "." to handle this case,
13080 it must be added to debug-file-directory. */
13081 return try_open_dwop_file (dwarf2_per_objfile,
13082 lbasename (file_name), 1 /*is_dwp*/,
13089 /* Initialize the use of the DWP file for the current objfile.
13090 By convention the name of the DWP file is ${objfile}.dwp.
13091 The result is NULL if it can't be found. */
13093 static std::unique_ptr<struct dwp_file>
13094 open_and_init_dwp_file (struct dwarf2_per_objfile *dwarf2_per_objfile)
13096 struct objfile *objfile = dwarf2_per_objfile->objfile;
13098 /* Try to find first .dwp for the binary file before any symbolic links
13101 /* If the objfile is a debug file, find the name of the real binary
13102 file and get the name of dwp file from there. */
13103 std::string dwp_name;
13104 if (objfile->separate_debug_objfile_backlink != NULL)
13106 struct objfile *backlink = objfile->separate_debug_objfile_backlink;
13107 const char *backlink_basename = lbasename (backlink->original_name);
13109 dwp_name = ldirname (objfile->original_name) + SLASH_STRING + backlink_basename;
13112 dwp_name = objfile->original_name;
13114 dwp_name += ".dwp";
13116 gdb_bfd_ref_ptr dbfd (open_dwp_file (dwarf2_per_objfile, dwp_name.c_str ()));
13118 && strcmp (objfile->original_name, objfile_name (objfile)) != 0)
13120 /* Try to find .dwp for the binary file after gdb_realpath resolving. */
13121 dwp_name = objfile_name (objfile);
13122 dwp_name += ".dwp";
13123 dbfd = open_dwp_file (dwarf2_per_objfile, dwp_name.c_str ());
13128 if (dwarf_read_debug)
13129 fprintf_unfiltered (gdb_stdlog, "DWP file not found: %s\n", dwp_name.c_str ());
13130 return std::unique_ptr<dwp_file> ();
13133 const char *name = bfd_get_filename (dbfd.get ());
13134 std::unique_ptr<struct dwp_file> dwp_file
13135 (new struct dwp_file (name, std::move (dbfd)));
13137 /* +1: section 0 is unused */
13138 dwp_file->num_sections = bfd_count_sections (dwp_file->dbfd) + 1;
13139 dwp_file->elf_sections =
13140 OBSTACK_CALLOC (&objfile->objfile_obstack,
13141 dwp_file->num_sections, asection *);
13143 bfd_map_over_sections (dwp_file->dbfd.get (),
13144 dwarf2_locate_common_dwp_sections,
13147 dwp_file->cus = create_dwp_hash_table (dwarf2_per_objfile, dwp_file.get (),
13150 dwp_file->tus = create_dwp_hash_table (dwarf2_per_objfile, dwp_file.get (),
13153 /* The DWP file version is stored in the hash table. Oh well. */
13154 if (dwp_file->cus && dwp_file->tus
13155 && dwp_file->cus->version != dwp_file->tus->version)
13157 /* Technically speaking, we should try to limp along, but this is
13158 pretty bizarre. We use pulongest here because that's the established
13159 portability solution (e.g, we cannot use %u for uint32_t). */
13160 error (_("Dwarf Error: DWP file CU version %s doesn't match"
13161 " TU version %s [in DWP file %s]"),
13162 pulongest (dwp_file->cus->version),
13163 pulongest (dwp_file->tus->version), dwp_name.c_str ());
13167 dwp_file->version = dwp_file->cus->version;
13168 else if (dwp_file->tus)
13169 dwp_file->version = dwp_file->tus->version;
13171 dwp_file->version = 2;
13173 if (dwp_file->version == 2)
13174 bfd_map_over_sections (dwp_file->dbfd.get (),
13175 dwarf2_locate_v2_dwp_sections,
13178 dwp_file->loaded_cus = allocate_dwp_loaded_cutus_table (objfile);
13179 dwp_file->loaded_tus = allocate_dwp_loaded_cutus_table (objfile);
13181 if (dwarf_read_debug)
13183 fprintf_unfiltered (gdb_stdlog, "DWP file found: %s\n", dwp_file->name);
13184 fprintf_unfiltered (gdb_stdlog,
13185 " %s CUs, %s TUs\n",
13186 pulongest (dwp_file->cus ? dwp_file->cus->nr_units : 0),
13187 pulongest (dwp_file->tus ? dwp_file->tus->nr_units : 0));
13193 /* Wrapper around open_and_init_dwp_file, only open it once. */
13195 static struct dwp_file *
13196 get_dwp_file (struct dwarf2_per_objfile *dwarf2_per_objfile)
13198 if (! dwarf2_per_objfile->dwp_checked)
13200 dwarf2_per_objfile->dwp_file
13201 = open_and_init_dwp_file (dwarf2_per_objfile);
13202 dwarf2_per_objfile->dwp_checked = 1;
13204 return dwarf2_per_objfile->dwp_file.get ();
13207 /* Subroutine of lookup_dwo_comp_unit, lookup_dwo_type_unit.
13208 Look up the CU/TU with signature SIGNATURE, either in DWO file DWO_NAME
13209 or in the DWP file for the objfile, referenced by THIS_UNIT.
13210 If non-NULL, comp_dir is the DW_AT_comp_dir attribute.
13211 IS_DEBUG_TYPES is non-zero if reading a TU, otherwise read a CU.
13213 This is called, for example, when wanting to read a variable with a
13214 complex location. Therefore we don't want to do file i/o for every call.
13215 Therefore we don't want to look for a DWO file on every call.
13216 Therefore we first see if we've already seen SIGNATURE in a DWP file,
13217 then we check if we've already seen DWO_NAME, and only THEN do we check
13220 The result is a pointer to the dwo_unit object or NULL if we didn't find it
13221 (dwo_id mismatch or couldn't find the DWO/DWP file). */
13223 static struct dwo_unit *
13224 lookup_dwo_cutu (struct dwarf2_per_cu_data *this_unit,
13225 const char *dwo_name, const char *comp_dir,
13226 ULONGEST signature, int is_debug_types)
13228 struct dwarf2_per_objfile *dwarf2_per_objfile = this_unit->dwarf2_per_objfile;
13229 struct objfile *objfile = dwarf2_per_objfile->objfile;
13230 const char *kind = is_debug_types ? "TU" : "CU";
13231 void **dwo_file_slot;
13232 struct dwo_file *dwo_file;
13233 struct dwp_file *dwp_file;
13235 /* First see if there's a DWP file.
13236 If we have a DWP file but didn't find the DWO inside it, don't
13237 look for the original DWO file. It makes gdb behave differently
13238 depending on whether one is debugging in the build tree. */
13240 dwp_file = get_dwp_file (dwarf2_per_objfile);
13241 if (dwp_file != NULL)
13243 const struct dwp_hash_table *dwp_htab =
13244 is_debug_types ? dwp_file->tus : dwp_file->cus;
13246 if (dwp_htab != NULL)
13248 struct dwo_unit *dwo_cutu =
13249 lookup_dwo_unit_in_dwp (dwarf2_per_objfile, dwp_file, comp_dir,
13250 signature, is_debug_types);
13252 if (dwo_cutu != NULL)
13254 if (dwarf_read_debug)
13256 fprintf_unfiltered (gdb_stdlog,
13257 "Virtual DWO %s %s found: @%s\n",
13258 kind, hex_string (signature),
13259 host_address_to_string (dwo_cutu));
13267 /* No DWP file, look for the DWO file. */
13269 dwo_file_slot = lookup_dwo_file_slot (dwarf2_per_objfile,
13270 dwo_name, comp_dir);
13271 if (*dwo_file_slot == NULL)
13273 /* Read in the file and build a table of the CUs/TUs it contains. */
13274 *dwo_file_slot = open_and_init_dwo_file (this_unit, dwo_name, comp_dir);
13276 /* NOTE: This will be NULL if unable to open the file. */
13277 dwo_file = (struct dwo_file *) *dwo_file_slot;
13279 if (dwo_file != NULL)
13281 struct dwo_unit *dwo_cutu = NULL;
13283 if (is_debug_types && dwo_file->tus)
13285 struct dwo_unit find_dwo_cutu;
13287 memset (&find_dwo_cutu, 0, sizeof (find_dwo_cutu));
13288 find_dwo_cutu.signature = signature;
13290 = (struct dwo_unit *) htab_find (dwo_file->tus, &find_dwo_cutu);
13292 else if (!is_debug_types && dwo_file->cus)
13294 struct dwo_unit find_dwo_cutu;
13296 memset (&find_dwo_cutu, 0, sizeof (find_dwo_cutu));
13297 find_dwo_cutu.signature = signature;
13298 dwo_cutu = (struct dwo_unit *)htab_find (dwo_file->cus,
13302 if (dwo_cutu != NULL)
13304 if (dwarf_read_debug)
13306 fprintf_unfiltered (gdb_stdlog, "DWO %s %s(%s) found: @%s\n",
13307 kind, dwo_name, hex_string (signature),
13308 host_address_to_string (dwo_cutu));
13315 /* We didn't find it. This could mean a dwo_id mismatch, or
13316 someone deleted the DWO/DWP file, or the search path isn't set up
13317 correctly to find the file. */
13319 if (dwarf_read_debug)
13321 fprintf_unfiltered (gdb_stdlog, "DWO %s %s(%s) not found\n",
13322 kind, dwo_name, hex_string (signature));
13325 /* This is a warning and not a complaint because it can be caused by
13326 pilot error (e.g., user accidentally deleting the DWO). */
13328 /* Print the name of the DWP file if we looked there, helps the user
13329 better diagnose the problem. */
13330 std::string dwp_text;
13332 if (dwp_file != NULL)
13333 dwp_text = string_printf (" [in DWP file %s]",
13334 lbasename (dwp_file->name));
13336 warning (_("Could not find DWO %s %s(%s)%s referenced by %s at offset %s"
13337 " [in module %s]"),
13338 kind, dwo_name, hex_string (signature),
13340 this_unit->is_debug_types ? "TU" : "CU",
13341 sect_offset_str (this_unit->sect_off), objfile_name (objfile));
13346 /* Lookup the DWO CU DWO_NAME/SIGNATURE referenced from THIS_CU.
13347 See lookup_dwo_cutu_unit for details. */
13349 static struct dwo_unit *
13350 lookup_dwo_comp_unit (struct dwarf2_per_cu_data *this_cu,
13351 const char *dwo_name, const char *comp_dir,
13352 ULONGEST signature)
13354 return lookup_dwo_cutu (this_cu, dwo_name, comp_dir, signature, 0);
13357 /* Lookup the DWO TU DWO_NAME/SIGNATURE referenced from THIS_TU.
13358 See lookup_dwo_cutu_unit for details. */
13360 static struct dwo_unit *
13361 lookup_dwo_type_unit (struct signatured_type *this_tu,
13362 const char *dwo_name, const char *comp_dir)
13364 return lookup_dwo_cutu (&this_tu->per_cu, dwo_name, comp_dir, this_tu->signature, 1);
13367 /* Traversal function for queue_and_load_all_dwo_tus. */
13370 queue_and_load_dwo_tu (void **slot, void *info)
13372 struct dwo_unit *dwo_unit = (struct dwo_unit *) *slot;
13373 struct dwarf2_per_cu_data *per_cu = (struct dwarf2_per_cu_data *) info;
13374 ULONGEST signature = dwo_unit->signature;
13375 struct signatured_type *sig_type =
13376 lookup_dwo_signatured_type (per_cu->cu, signature);
13378 if (sig_type != NULL)
13380 struct dwarf2_per_cu_data *sig_cu = &sig_type->per_cu;
13382 /* We pass NULL for DEPENDENT_CU because we don't yet know if there's
13383 a real dependency of PER_CU on SIG_TYPE. That is detected later
13384 while processing PER_CU. */
13385 if (maybe_queue_comp_unit (NULL, sig_cu, per_cu->cu->language))
13386 load_full_type_unit (sig_cu);
13387 VEC_safe_push (dwarf2_per_cu_ptr, per_cu->imported_symtabs, sig_cu);
13393 /* Queue all TUs contained in the DWO of PER_CU to be read in.
13394 The DWO may have the only definition of the type, though it may not be
13395 referenced anywhere in PER_CU. Thus we have to load *all* its TUs.
13396 http://sourceware.org/bugzilla/show_bug.cgi?id=15021 */
13399 queue_and_load_all_dwo_tus (struct dwarf2_per_cu_data *per_cu)
13401 struct dwo_unit *dwo_unit;
13402 struct dwo_file *dwo_file;
13404 gdb_assert (!per_cu->is_debug_types);
13405 gdb_assert (get_dwp_file (per_cu->dwarf2_per_objfile) == NULL);
13406 gdb_assert (per_cu->cu != NULL);
13408 dwo_unit = per_cu->cu->dwo_unit;
13409 gdb_assert (dwo_unit != NULL);
13411 dwo_file = dwo_unit->dwo_file;
13412 if (dwo_file->tus != NULL)
13413 htab_traverse_noresize (dwo_file->tus, queue_and_load_dwo_tu, per_cu);
13416 /* Free all resources associated with DWO_FILE.
13417 Close the DWO file and munmap the sections. */
13420 free_dwo_file (struct dwo_file *dwo_file)
13422 /* Note: dbfd is NULL for virtual DWO files. */
13423 gdb_bfd_unref (dwo_file->dbfd);
13425 VEC_free (dwarf2_section_info_def, dwo_file->sections.types);
13428 /* Traversal function for free_dwo_files. */
13431 free_dwo_file_from_slot (void **slot, void *info)
13433 struct dwo_file *dwo_file = (struct dwo_file *) *slot;
13435 free_dwo_file (dwo_file);
13440 /* Free all resources associated with DWO_FILES. */
13443 free_dwo_files (htab_t dwo_files, struct objfile *objfile)
13445 htab_traverse_noresize (dwo_files, free_dwo_file_from_slot, objfile);
13448 /* Read in various DIEs. */
13450 /* DW_AT_abstract_origin inherits whole DIEs (not just their attributes).
13451 Inherit only the children of the DW_AT_abstract_origin DIE not being
13452 already referenced by DW_AT_abstract_origin from the children of the
13456 inherit_abstract_dies (struct die_info *die, struct dwarf2_cu *cu)
13458 struct die_info *child_die;
13459 sect_offset *offsetp;
13460 /* Parent of DIE - referenced by DW_AT_abstract_origin. */
13461 struct die_info *origin_die;
13462 /* Iterator of the ORIGIN_DIE children. */
13463 struct die_info *origin_child_die;
13464 struct attribute *attr;
13465 struct dwarf2_cu *origin_cu;
13466 struct pending **origin_previous_list_in_scope;
13468 attr = dwarf2_attr (die, DW_AT_abstract_origin, cu);
13472 /* Note that following die references may follow to a die in a
13476 origin_die = follow_die_ref (die, attr, &origin_cu);
13478 /* We're inheriting ORIGIN's children into the scope we'd put DIE's
13480 origin_previous_list_in_scope = origin_cu->list_in_scope;
13481 origin_cu->list_in_scope = cu->list_in_scope;
13483 if (die->tag != origin_die->tag
13484 && !(die->tag == DW_TAG_inlined_subroutine
13485 && origin_die->tag == DW_TAG_subprogram))
13486 complaint (_("DIE %s and its abstract origin %s have different tags"),
13487 sect_offset_str (die->sect_off),
13488 sect_offset_str (origin_die->sect_off));
13490 std::vector<sect_offset> offsets;
13492 for (child_die = die->child;
13493 child_die && child_die->tag;
13494 child_die = sibling_die (child_die))
13496 struct die_info *child_origin_die;
13497 struct dwarf2_cu *child_origin_cu;
13499 /* We are trying to process concrete instance entries:
13500 DW_TAG_call_site DIEs indeed have a DW_AT_abstract_origin tag, but
13501 it's not relevant to our analysis here. i.e. detecting DIEs that are
13502 present in the abstract instance but not referenced in the concrete
13504 if (child_die->tag == DW_TAG_call_site
13505 || child_die->tag == DW_TAG_GNU_call_site)
13508 /* For each CHILD_DIE, find the corresponding child of
13509 ORIGIN_DIE. If there is more than one layer of
13510 DW_AT_abstract_origin, follow them all; there shouldn't be,
13511 but GCC versions at least through 4.4 generate this (GCC PR
13513 child_origin_die = child_die;
13514 child_origin_cu = cu;
13517 attr = dwarf2_attr (child_origin_die, DW_AT_abstract_origin,
13521 child_origin_die = follow_die_ref (child_origin_die, attr,
13525 /* According to DWARF3 3.3.8.2 #3 new entries without their abstract
13526 counterpart may exist. */
13527 if (child_origin_die != child_die)
13529 if (child_die->tag != child_origin_die->tag
13530 && !(child_die->tag == DW_TAG_inlined_subroutine
13531 && child_origin_die->tag == DW_TAG_subprogram))
13532 complaint (_("Child DIE %s and its abstract origin %s have "
13534 sect_offset_str (child_die->sect_off),
13535 sect_offset_str (child_origin_die->sect_off));
13536 if (child_origin_die->parent != origin_die)
13537 complaint (_("Child DIE %s and its abstract origin %s have "
13538 "different parents"),
13539 sect_offset_str (child_die->sect_off),
13540 sect_offset_str (child_origin_die->sect_off));
13542 offsets.push_back (child_origin_die->sect_off);
13545 std::sort (offsets.begin (), offsets.end ());
13546 sect_offset *offsets_end = offsets.data () + offsets.size ();
13547 for (offsetp = offsets.data () + 1; offsetp < offsets_end; offsetp++)
13548 if (offsetp[-1] == *offsetp)
13549 complaint (_("Multiple children of DIE %s refer "
13550 "to DIE %s as their abstract origin"),
13551 sect_offset_str (die->sect_off), sect_offset_str (*offsetp));
13553 offsetp = offsets.data ();
13554 origin_child_die = origin_die->child;
13555 while (origin_child_die && origin_child_die->tag)
13557 /* Is ORIGIN_CHILD_DIE referenced by any of the DIE children? */
13558 while (offsetp < offsets_end
13559 && *offsetp < origin_child_die->sect_off)
13561 if (offsetp >= offsets_end
13562 || *offsetp > origin_child_die->sect_off)
13564 /* Found that ORIGIN_CHILD_DIE is really not referenced.
13565 Check whether we're already processing ORIGIN_CHILD_DIE.
13566 This can happen with mutually referenced abstract_origins.
13568 if (!origin_child_die->in_process)
13569 process_die (origin_child_die, origin_cu);
13571 origin_child_die = sibling_die (origin_child_die);
13573 origin_cu->list_in_scope = origin_previous_list_in_scope;
13577 read_func_scope (struct die_info *die, struct dwarf2_cu *cu)
13579 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
13580 struct gdbarch *gdbarch = get_objfile_arch (objfile);
13581 struct context_stack *newobj;
13584 struct die_info *child_die;
13585 struct attribute *attr, *call_line, *call_file;
13587 CORE_ADDR baseaddr;
13588 struct block *block;
13589 int inlined_func = (die->tag == DW_TAG_inlined_subroutine);
13590 std::vector<struct symbol *> template_args;
13591 struct template_symbol *templ_func = NULL;
13595 /* If we do not have call site information, we can't show the
13596 caller of this inlined function. That's too confusing, so
13597 only use the scope for local variables. */
13598 call_line = dwarf2_attr (die, DW_AT_call_line, cu);
13599 call_file = dwarf2_attr (die, DW_AT_call_file, cu);
13600 if (call_line == NULL || call_file == NULL)
13602 read_lexical_block_scope (die, cu);
13607 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
13609 name = dwarf2_name (die, cu);
13611 /* Ignore functions with missing or empty names. These are actually
13612 illegal according to the DWARF standard. */
13615 complaint (_("missing name for subprogram DIE at %s"),
13616 sect_offset_str (die->sect_off));
13620 /* Ignore functions with missing or invalid low and high pc attributes. */
13621 if (dwarf2_get_pc_bounds (die, &lowpc, &highpc, cu, NULL)
13622 <= PC_BOUNDS_INVALID)
13624 attr = dwarf2_attr (die, DW_AT_external, cu);
13625 if (!attr || !DW_UNSND (attr))
13626 complaint (_("cannot get low and high bounds "
13627 "for subprogram DIE at %s"),
13628 sect_offset_str (die->sect_off));
13632 lowpc = gdbarch_adjust_dwarf2_addr (gdbarch, lowpc + baseaddr);
13633 highpc = gdbarch_adjust_dwarf2_addr (gdbarch, highpc + baseaddr);
13635 /* If we have any template arguments, then we must allocate a
13636 different sort of symbol. */
13637 for (child_die = die->child; child_die; child_die = sibling_die (child_die))
13639 if (child_die->tag == DW_TAG_template_type_param
13640 || child_die->tag == DW_TAG_template_value_param)
13642 templ_func = allocate_template_symbol (objfile);
13643 templ_func->subclass = SYMBOL_TEMPLATE;
13648 newobj = cu->builder->push_context (0, lowpc);
13649 newobj->name = new_symbol (die, read_type_die (die, cu), cu,
13650 (struct symbol *) templ_func);
13652 /* If there is a location expression for DW_AT_frame_base, record
13654 attr = dwarf2_attr (die, DW_AT_frame_base, cu);
13656 dwarf2_symbol_mark_computed (attr, newobj->name, cu, 1);
13658 /* If there is a location for the static link, record it. */
13659 newobj->static_link = NULL;
13660 attr = dwarf2_attr (die, DW_AT_static_link, cu);
13663 newobj->static_link
13664 = XOBNEW (&objfile->objfile_obstack, struct dynamic_prop);
13665 attr_to_dynamic_prop (attr, die, cu, newobj->static_link);
13668 cu->list_in_scope = cu->builder->get_local_symbols ();
13670 if (die->child != NULL)
13672 child_die = die->child;
13673 while (child_die && child_die->tag)
13675 if (child_die->tag == DW_TAG_template_type_param
13676 || child_die->tag == DW_TAG_template_value_param)
13678 struct symbol *arg = new_symbol (child_die, NULL, cu);
13681 template_args.push_back (arg);
13684 process_die (child_die, cu);
13685 child_die = sibling_die (child_die);
13689 inherit_abstract_dies (die, cu);
13691 /* If we have a DW_AT_specification, we might need to import using
13692 directives from the context of the specification DIE. See the
13693 comment in determine_prefix. */
13694 if (cu->language == language_cplus
13695 && dwarf2_attr (die, DW_AT_specification, cu))
13697 struct dwarf2_cu *spec_cu = cu;
13698 struct die_info *spec_die = die_specification (die, &spec_cu);
13702 child_die = spec_die->child;
13703 while (child_die && child_die->tag)
13705 if (child_die->tag == DW_TAG_imported_module)
13706 process_die (child_die, spec_cu);
13707 child_die = sibling_die (child_die);
13710 /* In some cases, GCC generates specification DIEs that
13711 themselves contain DW_AT_specification attributes. */
13712 spec_die = die_specification (spec_die, &spec_cu);
13716 struct context_stack cstk = cu->builder->pop_context ();
13717 /* Make a block for the local symbols within. */
13718 block = cu->builder->finish_block (cstk.name, cstk.old_blocks,
13719 cstk.static_link, lowpc, highpc);
13721 /* For C++, set the block's scope. */
13722 if ((cu->language == language_cplus
13723 || cu->language == language_fortran
13724 || cu->language == language_d
13725 || cu->language == language_rust)
13726 && cu->processing_has_namespace_info)
13727 block_set_scope (block, determine_prefix (die, cu),
13728 &objfile->objfile_obstack);
13730 /* If we have address ranges, record them. */
13731 dwarf2_record_block_ranges (die, block, baseaddr, cu);
13733 gdbarch_make_symbol_special (gdbarch, cstk.name, objfile);
13735 /* Attach template arguments to function. */
13736 if (!template_args.empty ())
13738 gdb_assert (templ_func != NULL);
13740 templ_func->n_template_arguments = template_args.size ();
13741 templ_func->template_arguments
13742 = XOBNEWVEC (&objfile->objfile_obstack, struct symbol *,
13743 templ_func->n_template_arguments);
13744 memcpy (templ_func->template_arguments,
13745 template_args.data (),
13746 (templ_func->n_template_arguments * sizeof (struct symbol *)));
13749 /* In C++, we can have functions nested inside functions (e.g., when
13750 a function declares a class that has methods). This means that
13751 when we finish processing a function scope, we may need to go
13752 back to building a containing block's symbol lists. */
13753 *cu->builder->get_local_symbols () = cstk.locals;
13754 cu->builder->set_local_using_directives (cstk.local_using_directives);
13756 /* If we've finished processing a top-level function, subsequent
13757 symbols go in the file symbol list. */
13758 if (cu->builder->outermost_context_p ())
13759 cu->list_in_scope = cu->builder->get_file_symbols ();
13762 /* Process all the DIES contained within a lexical block scope. Start
13763 a new scope, process the dies, and then close the scope. */
13766 read_lexical_block_scope (struct die_info *die, struct dwarf2_cu *cu)
13768 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
13769 struct gdbarch *gdbarch = get_objfile_arch (objfile);
13770 CORE_ADDR lowpc, highpc;
13771 struct die_info *child_die;
13772 CORE_ADDR baseaddr;
13774 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
13776 /* Ignore blocks with missing or invalid low and high pc attributes. */
13777 /* ??? Perhaps consider discontiguous blocks defined by DW_AT_ranges
13778 as multiple lexical blocks? Handling children in a sane way would
13779 be nasty. Might be easier to properly extend generic blocks to
13780 describe ranges. */
13781 switch (dwarf2_get_pc_bounds (die, &lowpc, &highpc, cu, NULL))
13783 case PC_BOUNDS_NOT_PRESENT:
13784 /* DW_TAG_lexical_block has no attributes, process its children as if
13785 there was no wrapping by that DW_TAG_lexical_block.
13786 GCC does no longer produces such DWARF since GCC r224161. */
13787 for (child_die = die->child;
13788 child_die != NULL && child_die->tag;
13789 child_die = sibling_die (child_die))
13790 process_die (child_die, cu);
13792 case PC_BOUNDS_INVALID:
13795 lowpc = gdbarch_adjust_dwarf2_addr (gdbarch, lowpc + baseaddr);
13796 highpc = gdbarch_adjust_dwarf2_addr (gdbarch, highpc + baseaddr);
13798 cu->builder->push_context (0, lowpc);
13799 if (die->child != NULL)
13801 child_die = die->child;
13802 while (child_die && child_die->tag)
13804 process_die (child_die, cu);
13805 child_die = sibling_die (child_die);
13808 inherit_abstract_dies (die, cu);
13809 struct context_stack cstk = cu->builder->pop_context ();
13811 if (*cu->builder->get_local_symbols () != NULL
13812 || (*cu->builder->get_local_using_directives ()) != NULL)
13814 struct block *block
13815 = cu->builder->finish_block (0, cstk.old_blocks, NULL,
13816 cstk.start_addr, highpc);
13818 /* Note that recording ranges after traversing children, as we
13819 do here, means that recording a parent's ranges entails
13820 walking across all its children's ranges as they appear in
13821 the address map, which is quadratic behavior.
13823 It would be nicer to record the parent's ranges before
13824 traversing its children, simply overriding whatever you find
13825 there. But since we don't even decide whether to create a
13826 block until after we've traversed its children, that's hard
13828 dwarf2_record_block_ranges (die, block, baseaddr, cu);
13830 *cu->builder->get_local_symbols () = cstk.locals;
13831 cu->builder->set_local_using_directives (cstk.local_using_directives);
13834 /* Read in DW_TAG_call_site and insert it to CU->call_site_htab. */
13837 read_call_site_scope (struct die_info *die, struct dwarf2_cu *cu)
13839 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
13840 struct gdbarch *gdbarch = get_objfile_arch (objfile);
13841 CORE_ADDR pc, baseaddr;
13842 struct attribute *attr;
13843 struct call_site *call_site, call_site_local;
13846 struct die_info *child_die;
13848 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
13850 attr = dwarf2_attr (die, DW_AT_call_return_pc, cu);
13853 /* This was a pre-DWARF-5 GNU extension alias
13854 for DW_AT_call_return_pc. */
13855 attr = dwarf2_attr (die, DW_AT_low_pc, cu);
13859 complaint (_("missing DW_AT_call_return_pc for DW_TAG_call_site "
13860 "DIE %s [in module %s]"),
13861 sect_offset_str (die->sect_off), objfile_name (objfile));
13864 pc = attr_value_as_address (attr) + baseaddr;
13865 pc = gdbarch_adjust_dwarf2_addr (gdbarch, pc);
13867 if (cu->call_site_htab == NULL)
13868 cu->call_site_htab = htab_create_alloc_ex (16, core_addr_hash, core_addr_eq,
13869 NULL, &objfile->objfile_obstack,
13870 hashtab_obstack_allocate, NULL);
13871 call_site_local.pc = pc;
13872 slot = htab_find_slot (cu->call_site_htab, &call_site_local, INSERT);
13875 complaint (_("Duplicate PC %s for DW_TAG_call_site "
13876 "DIE %s [in module %s]"),
13877 paddress (gdbarch, pc), sect_offset_str (die->sect_off),
13878 objfile_name (objfile));
13882 /* Count parameters at the caller. */
13885 for (child_die = die->child; child_die && child_die->tag;
13886 child_die = sibling_die (child_die))
13888 if (child_die->tag != DW_TAG_call_site_parameter
13889 && child_die->tag != DW_TAG_GNU_call_site_parameter)
13891 complaint (_("Tag %d is not DW_TAG_call_site_parameter in "
13892 "DW_TAG_call_site child DIE %s [in module %s]"),
13893 child_die->tag, sect_offset_str (child_die->sect_off),
13894 objfile_name (objfile));
13902 = ((struct call_site *)
13903 obstack_alloc (&objfile->objfile_obstack,
13904 sizeof (*call_site)
13905 + (sizeof (*call_site->parameter) * (nparams - 1))));
13907 memset (call_site, 0, sizeof (*call_site) - sizeof (*call_site->parameter));
13908 call_site->pc = pc;
13910 if (dwarf2_flag_true_p (die, DW_AT_call_tail_call, cu)
13911 || dwarf2_flag_true_p (die, DW_AT_GNU_tail_call, cu))
13913 struct die_info *func_die;
13915 /* Skip also over DW_TAG_inlined_subroutine. */
13916 for (func_die = die->parent;
13917 func_die && func_die->tag != DW_TAG_subprogram
13918 && func_die->tag != DW_TAG_subroutine_type;
13919 func_die = func_die->parent);
13921 /* DW_AT_call_all_calls is a superset
13922 of DW_AT_call_all_tail_calls. */
13924 && !dwarf2_flag_true_p (func_die, DW_AT_call_all_calls, cu)
13925 && !dwarf2_flag_true_p (func_die, DW_AT_GNU_all_call_sites, cu)
13926 && !dwarf2_flag_true_p (func_die, DW_AT_call_all_tail_calls, cu)
13927 && !dwarf2_flag_true_p (func_die, DW_AT_GNU_all_tail_call_sites, cu))
13929 /* TYPE_TAIL_CALL_LIST is not interesting in functions where it is
13930 not complete. But keep CALL_SITE for look ups via call_site_htab,
13931 both the initial caller containing the real return address PC and
13932 the final callee containing the current PC of a chain of tail
13933 calls do not need to have the tail call list complete. But any
13934 function candidate for a virtual tail call frame searched via
13935 TYPE_TAIL_CALL_LIST must have the tail call list complete to be
13936 determined unambiguously. */
13940 struct type *func_type = NULL;
13943 func_type = get_die_type (func_die, cu);
13944 if (func_type != NULL)
13946 gdb_assert (TYPE_CODE (func_type) == TYPE_CODE_FUNC);
13948 /* Enlist this call site to the function. */
13949 call_site->tail_call_next = TYPE_TAIL_CALL_LIST (func_type);
13950 TYPE_TAIL_CALL_LIST (func_type) = call_site;
13953 complaint (_("Cannot find function owning DW_TAG_call_site "
13954 "DIE %s [in module %s]"),
13955 sect_offset_str (die->sect_off), objfile_name (objfile));
13959 attr = dwarf2_attr (die, DW_AT_call_target, cu);
13961 attr = dwarf2_attr (die, DW_AT_GNU_call_site_target, cu);
13963 attr = dwarf2_attr (die, DW_AT_call_origin, cu);
13966 /* This was a pre-DWARF-5 GNU extension alias for DW_AT_call_origin. */
13967 attr = dwarf2_attr (die, DW_AT_abstract_origin, cu);
13969 SET_FIELD_DWARF_BLOCK (call_site->target, NULL);
13970 if (!attr || (attr_form_is_block (attr) && DW_BLOCK (attr)->size == 0))
13971 /* Keep NULL DWARF_BLOCK. */;
13972 else if (attr_form_is_block (attr))
13974 struct dwarf2_locexpr_baton *dlbaton;
13976 dlbaton = XOBNEW (&objfile->objfile_obstack, struct dwarf2_locexpr_baton);
13977 dlbaton->data = DW_BLOCK (attr)->data;
13978 dlbaton->size = DW_BLOCK (attr)->size;
13979 dlbaton->per_cu = cu->per_cu;
13981 SET_FIELD_DWARF_BLOCK (call_site->target, dlbaton);
13983 else if (attr_form_is_ref (attr))
13985 struct dwarf2_cu *target_cu = cu;
13986 struct die_info *target_die;
13988 target_die = follow_die_ref (die, attr, &target_cu);
13989 gdb_assert (target_cu->per_cu->dwarf2_per_objfile->objfile == objfile);
13990 if (die_is_declaration (target_die, target_cu))
13992 const char *target_physname;
13994 /* Prefer the mangled name; otherwise compute the demangled one. */
13995 target_physname = dw2_linkage_name (target_die, target_cu);
13996 if (target_physname == NULL)
13997 target_physname = dwarf2_physname (NULL, target_die, target_cu);
13998 if (target_physname == NULL)
13999 complaint (_("DW_AT_call_target target DIE has invalid "
14000 "physname, for referencing DIE %s [in module %s]"),
14001 sect_offset_str (die->sect_off), objfile_name (objfile));
14003 SET_FIELD_PHYSNAME (call_site->target, target_physname);
14009 /* DW_AT_entry_pc should be preferred. */
14010 if (dwarf2_get_pc_bounds (target_die, &lowpc, NULL, target_cu, NULL)
14011 <= PC_BOUNDS_INVALID)
14012 complaint (_("DW_AT_call_target target DIE has invalid "
14013 "low pc, for referencing DIE %s [in module %s]"),
14014 sect_offset_str (die->sect_off), objfile_name (objfile));
14017 lowpc = gdbarch_adjust_dwarf2_addr (gdbarch, lowpc + baseaddr);
14018 SET_FIELD_PHYSADDR (call_site->target, lowpc);
14023 complaint (_("DW_TAG_call_site DW_AT_call_target is neither "
14024 "block nor reference, for DIE %s [in module %s]"),
14025 sect_offset_str (die->sect_off), objfile_name (objfile));
14027 call_site->per_cu = cu->per_cu;
14029 for (child_die = die->child;
14030 child_die && child_die->tag;
14031 child_die = sibling_die (child_die))
14033 struct call_site_parameter *parameter;
14034 struct attribute *loc, *origin;
14036 if (child_die->tag != DW_TAG_call_site_parameter
14037 && child_die->tag != DW_TAG_GNU_call_site_parameter)
14039 /* Already printed the complaint above. */
14043 gdb_assert (call_site->parameter_count < nparams);
14044 parameter = &call_site->parameter[call_site->parameter_count];
14046 /* DW_AT_location specifies the register number or DW_AT_abstract_origin
14047 specifies DW_TAG_formal_parameter. Value of the data assumed for the
14048 register is contained in DW_AT_call_value. */
14050 loc = dwarf2_attr (child_die, DW_AT_location, cu);
14051 origin = dwarf2_attr (child_die, DW_AT_call_parameter, cu);
14052 if (origin == NULL)
14054 /* This was a pre-DWARF-5 GNU extension alias
14055 for DW_AT_call_parameter. */
14056 origin = dwarf2_attr (child_die, DW_AT_abstract_origin, cu);
14058 if (loc == NULL && origin != NULL && attr_form_is_ref (origin))
14060 parameter->kind = CALL_SITE_PARAMETER_PARAM_OFFSET;
14062 sect_offset sect_off
14063 = (sect_offset) dwarf2_get_ref_die_offset (origin);
14064 if (!offset_in_cu_p (&cu->header, sect_off))
14066 /* As DW_OP_GNU_parameter_ref uses CU-relative offset this
14067 binding can be done only inside one CU. Such referenced DIE
14068 therefore cannot be even moved to DW_TAG_partial_unit. */
14069 complaint (_("DW_AT_call_parameter offset is not in CU for "
14070 "DW_TAG_call_site child DIE %s [in module %s]"),
14071 sect_offset_str (child_die->sect_off),
14072 objfile_name (objfile));
14075 parameter->u.param_cu_off
14076 = (cu_offset) (sect_off - cu->header.sect_off);
14078 else if (loc == NULL || origin != NULL || !attr_form_is_block (loc))
14080 complaint (_("No DW_FORM_block* DW_AT_location for "
14081 "DW_TAG_call_site child DIE %s [in module %s]"),
14082 sect_offset_str (child_die->sect_off), objfile_name (objfile));
14087 parameter->u.dwarf_reg = dwarf_block_to_dwarf_reg
14088 (DW_BLOCK (loc)->data, &DW_BLOCK (loc)->data[DW_BLOCK (loc)->size]);
14089 if (parameter->u.dwarf_reg != -1)
14090 parameter->kind = CALL_SITE_PARAMETER_DWARF_REG;
14091 else if (dwarf_block_to_sp_offset (gdbarch, DW_BLOCK (loc)->data,
14092 &DW_BLOCK (loc)->data[DW_BLOCK (loc)->size],
14093 ¶meter->u.fb_offset))
14094 parameter->kind = CALL_SITE_PARAMETER_FB_OFFSET;
14097 complaint (_("Only single DW_OP_reg or DW_OP_fbreg is supported "
14098 "for DW_FORM_block* DW_AT_location is supported for "
14099 "DW_TAG_call_site child DIE %s "
14101 sect_offset_str (child_die->sect_off),
14102 objfile_name (objfile));
14107 attr = dwarf2_attr (child_die, DW_AT_call_value, cu);
14109 attr = dwarf2_attr (child_die, DW_AT_GNU_call_site_value, cu);
14110 if (!attr_form_is_block (attr))
14112 complaint (_("No DW_FORM_block* DW_AT_call_value for "
14113 "DW_TAG_call_site child DIE %s [in module %s]"),
14114 sect_offset_str (child_die->sect_off),
14115 objfile_name (objfile));
14118 parameter->value = DW_BLOCK (attr)->data;
14119 parameter->value_size = DW_BLOCK (attr)->size;
14121 /* Parameters are not pre-cleared by memset above. */
14122 parameter->data_value = NULL;
14123 parameter->data_value_size = 0;
14124 call_site->parameter_count++;
14126 attr = dwarf2_attr (child_die, DW_AT_call_data_value, cu);
14128 attr = dwarf2_attr (child_die, DW_AT_GNU_call_site_data_value, cu);
14131 if (!attr_form_is_block (attr))
14132 complaint (_("No DW_FORM_block* DW_AT_call_data_value for "
14133 "DW_TAG_call_site child DIE %s [in module %s]"),
14134 sect_offset_str (child_die->sect_off),
14135 objfile_name (objfile));
14138 parameter->data_value = DW_BLOCK (attr)->data;
14139 parameter->data_value_size = DW_BLOCK (attr)->size;
14145 /* Helper function for read_variable. If DIE represents a virtual
14146 table, then return the type of the concrete object that is
14147 associated with the virtual table. Otherwise, return NULL. */
14149 static struct type *
14150 rust_containing_type (struct die_info *die, struct dwarf2_cu *cu)
14152 struct attribute *attr = dwarf2_attr (die, DW_AT_type, cu);
14156 /* Find the type DIE. */
14157 struct die_info *type_die = NULL;
14158 struct dwarf2_cu *type_cu = cu;
14160 if (attr_form_is_ref (attr))
14161 type_die = follow_die_ref (die, attr, &type_cu);
14162 if (type_die == NULL)
14165 if (dwarf2_attr (type_die, DW_AT_containing_type, type_cu) == NULL)
14167 return die_containing_type (type_die, type_cu);
14170 /* Read a variable (DW_TAG_variable) DIE and create a new symbol. */
14173 read_variable (struct die_info *die, struct dwarf2_cu *cu)
14175 struct rust_vtable_symbol *storage = NULL;
14177 if (cu->language == language_rust)
14179 struct type *containing_type = rust_containing_type (die, cu);
14181 if (containing_type != NULL)
14183 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
14185 storage = OBSTACK_ZALLOC (&objfile->objfile_obstack,
14186 struct rust_vtable_symbol);
14187 initialize_objfile_symbol (storage);
14188 storage->concrete_type = containing_type;
14189 storage->subclass = SYMBOL_RUST_VTABLE;
14193 new_symbol (die, NULL, cu, storage);
14196 /* Call CALLBACK from DW_AT_ranges attribute value OFFSET
14197 reading .debug_rnglists.
14198 Callback's type should be:
14199 void (CORE_ADDR range_beginning, CORE_ADDR range_end)
14200 Return true if the attributes are present and valid, otherwise,
14203 template <typename Callback>
14205 dwarf2_rnglists_process (unsigned offset, struct dwarf2_cu *cu,
14206 Callback &&callback)
14208 struct dwarf2_per_objfile *dwarf2_per_objfile
14209 = cu->per_cu->dwarf2_per_objfile;
14210 struct objfile *objfile = dwarf2_per_objfile->objfile;
14211 bfd *obfd = objfile->obfd;
14212 /* Base address selection entry. */
14215 const gdb_byte *buffer;
14216 CORE_ADDR baseaddr;
14217 bool overflow = false;
14219 found_base = cu->base_known;
14220 base = cu->base_address;
14222 dwarf2_read_section (objfile, &dwarf2_per_objfile->rnglists);
14223 if (offset >= dwarf2_per_objfile->rnglists.size)
14225 complaint (_("Offset %d out of bounds for DW_AT_ranges attribute"),
14229 buffer = dwarf2_per_objfile->rnglists.buffer + offset;
14231 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
14235 /* Initialize it due to a false compiler warning. */
14236 CORE_ADDR range_beginning = 0, range_end = 0;
14237 const gdb_byte *buf_end = (dwarf2_per_objfile->rnglists.buffer
14238 + dwarf2_per_objfile->rnglists.size);
14239 unsigned int bytes_read;
14241 if (buffer == buf_end)
14246 const auto rlet = static_cast<enum dwarf_range_list_entry>(*buffer++);
14249 case DW_RLE_end_of_list:
14251 case DW_RLE_base_address:
14252 if (buffer + cu->header.addr_size > buf_end)
14257 base = read_address (obfd, buffer, cu, &bytes_read);
14259 buffer += bytes_read;
14261 case DW_RLE_start_length:
14262 if (buffer + cu->header.addr_size > buf_end)
14267 range_beginning = read_address (obfd, buffer, cu, &bytes_read);
14268 buffer += bytes_read;
14269 range_end = (range_beginning
14270 + read_unsigned_leb128 (obfd, buffer, &bytes_read));
14271 buffer += bytes_read;
14272 if (buffer > buf_end)
14278 case DW_RLE_offset_pair:
14279 range_beginning = read_unsigned_leb128 (obfd, buffer, &bytes_read);
14280 buffer += bytes_read;
14281 if (buffer > buf_end)
14286 range_end = read_unsigned_leb128 (obfd, buffer, &bytes_read);
14287 buffer += bytes_read;
14288 if (buffer > buf_end)
14294 case DW_RLE_start_end:
14295 if (buffer + 2 * cu->header.addr_size > buf_end)
14300 range_beginning = read_address (obfd, buffer, cu, &bytes_read);
14301 buffer += bytes_read;
14302 range_end = read_address (obfd, buffer, cu, &bytes_read);
14303 buffer += bytes_read;
14306 complaint (_("Invalid .debug_rnglists data (no base address)"));
14309 if (rlet == DW_RLE_end_of_list || overflow)
14311 if (rlet == DW_RLE_base_address)
14316 /* We have no valid base address for the ranges
14318 complaint (_("Invalid .debug_rnglists data (no base address)"));
14322 if (range_beginning > range_end)
14324 /* Inverted range entries are invalid. */
14325 complaint (_("Invalid .debug_rnglists data (inverted range)"));
14329 /* Empty range entries have no effect. */
14330 if (range_beginning == range_end)
14333 range_beginning += base;
14336 /* A not-uncommon case of bad debug info.
14337 Don't pollute the addrmap with bad data. */
14338 if (range_beginning + baseaddr == 0
14339 && !dwarf2_per_objfile->has_section_at_zero)
14341 complaint (_(".debug_rnglists entry has start address of zero"
14342 " [in module %s]"), objfile_name (objfile));
14346 callback (range_beginning, range_end);
14351 complaint (_("Offset %d is not terminated "
14352 "for DW_AT_ranges attribute"),
14360 /* Call CALLBACK from DW_AT_ranges attribute value OFFSET reading .debug_ranges.
14361 Callback's type should be:
14362 void (CORE_ADDR range_beginning, CORE_ADDR range_end)
14363 Return 1 if the attributes are present and valid, otherwise, return 0. */
14365 template <typename Callback>
14367 dwarf2_ranges_process (unsigned offset, struct dwarf2_cu *cu,
14368 Callback &&callback)
14370 struct dwarf2_per_objfile *dwarf2_per_objfile
14371 = cu->per_cu->dwarf2_per_objfile;
14372 struct objfile *objfile = dwarf2_per_objfile->objfile;
14373 struct comp_unit_head *cu_header = &cu->header;
14374 bfd *obfd = objfile->obfd;
14375 unsigned int addr_size = cu_header->addr_size;
14376 CORE_ADDR mask = ~(~(CORE_ADDR)1 << (addr_size * 8 - 1));
14377 /* Base address selection entry. */
14380 unsigned int dummy;
14381 const gdb_byte *buffer;
14382 CORE_ADDR baseaddr;
14384 if (cu_header->version >= 5)
14385 return dwarf2_rnglists_process (offset, cu, callback);
14387 found_base = cu->base_known;
14388 base = cu->base_address;
14390 dwarf2_read_section (objfile, &dwarf2_per_objfile->ranges);
14391 if (offset >= dwarf2_per_objfile->ranges.size)
14393 complaint (_("Offset %d out of bounds for DW_AT_ranges attribute"),
14397 buffer = dwarf2_per_objfile->ranges.buffer + offset;
14399 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
14403 CORE_ADDR range_beginning, range_end;
14405 range_beginning = read_address (obfd, buffer, cu, &dummy);
14406 buffer += addr_size;
14407 range_end = read_address (obfd, buffer, cu, &dummy);
14408 buffer += addr_size;
14409 offset += 2 * addr_size;
14411 /* An end of list marker is a pair of zero addresses. */
14412 if (range_beginning == 0 && range_end == 0)
14413 /* Found the end of list entry. */
14416 /* Each base address selection entry is a pair of 2 values.
14417 The first is the largest possible address, the second is
14418 the base address. Check for a base address here. */
14419 if ((range_beginning & mask) == mask)
14421 /* If we found the largest possible address, then we already
14422 have the base address in range_end. */
14430 /* We have no valid base address for the ranges
14432 complaint (_("Invalid .debug_ranges data (no base address)"));
14436 if (range_beginning > range_end)
14438 /* Inverted range entries are invalid. */
14439 complaint (_("Invalid .debug_ranges data (inverted range)"));
14443 /* Empty range entries have no effect. */
14444 if (range_beginning == range_end)
14447 range_beginning += base;
14450 /* A not-uncommon case of bad debug info.
14451 Don't pollute the addrmap with bad data. */
14452 if (range_beginning + baseaddr == 0
14453 && !dwarf2_per_objfile->has_section_at_zero)
14455 complaint (_(".debug_ranges entry has start address of zero"
14456 " [in module %s]"), objfile_name (objfile));
14460 callback (range_beginning, range_end);
14466 /* Get low and high pc attributes from DW_AT_ranges attribute value OFFSET.
14467 Return 1 if the attributes are present and valid, otherwise, return 0.
14468 If RANGES_PST is not NULL we should setup `objfile->psymtabs_addrmap'. */
14471 dwarf2_ranges_read (unsigned offset, CORE_ADDR *low_return,
14472 CORE_ADDR *high_return, struct dwarf2_cu *cu,
14473 struct partial_symtab *ranges_pst)
14475 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
14476 struct gdbarch *gdbarch = get_objfile_arch (objfile);
14477 const CORE_ADDR baseaddr = ANOFFSET (objfile->section_offsets,
14478 SECT_OFF_TEXT (objfile));
14481 CORE_ADDR high = 0;
14484 retval = dwarf2_ranges_process (offset, cu,
14485 [&] (CORE_ADDR range_beginning, CORE_ADDR range_end)
14487 if (ranges_pst != NULL)
14492 lowpc = gdbarch_adjust_dwarf2_addr (gdbarch,
14493 range_beginning + baseaddr);
14494 highpc = gdbarch_adjust_dwarf2_addr (gdbarch,
14495 range_end + baseaddr);
14496 addrmap_set_empty (objfile->psymtabs_addrmap, lowpc, highpc - 1,
14500 /* FIXME: This is recording everything as a low-high
14501 segment of consecutive addresses. We should have a
14502 data structure for discontiguous block ranges
14506 low = range_beginning;
14512 if (range_beginning < low)
14513 low = range_beginning;
14514 if (range_end > high)
14522 /* If the first entry is an end-of-list marker, the range
14523 describes an empty scope, i.e. no instructions. */
14529 *high_return = high;
14533 /* Get low and high pc attributes from a die. See enum pc_bounds_kind
14534 definition for the return value. *LOWPC and *HIGHPC are set iff
14535 neither PC_BOUNDS_NOT_PRESENT nor PC_BOUNDS_INVALID are returned. */
14537 static enum pc_bounds_kind
14538 dwarf2_get_pc_bounds (struct die_info *die, CORE_ADDR *lowpc,
14539 CORE_ADDR *highpc, struct dwarf2_cu *cu,
14540 struct partial_symtab *pst)
14542 struct dwarf2_per_objfile *dwarf2_per_objfile
14543 = cu->per_cu->dwarf2_per_objfile;
14544 struct attribute *attr;
14545 struct attribute *attr_high;
14547 CORE_ADDR high = 0;
14548 enum pc_bounds_kind ret;
14550 attr_high = dwarf2_attr (die, DW_AT_high_pc, cu);
14553 attr = dwarf2_attr (die, DW_AT_low_pc, cu);
14556 low = attr_value_as_address (attr);
14557 high = attr_value_as_address (attr_high);
14558 if (cu->header.version >= 4 && attr_form_is_constant (attr_high))
14562 /* Found high w/o low attribute. */
14563 return PC_BOUNDS_INVALID;
14565 /* Found consecutive range of addresses. */
14566 ret = PC_BOUNDS_HIGH_LOW;
14570 attr = dwarf2_attr (die, DW_AT_ranges, cu);
14573 /* DW_AT_ranges_base does not apply to DIEs from the DWO skeleton.
14574 We take advantage of the fact that DW_AT_ranges does not appear
14575 in DW_TAG_compile_unit of DWO files. */
14576 int need_ranges_base = die->tag != DW_TAG_compile_unit;
14577 unsigned int ranges_offset = (DW_UNSND (attr)
14578 + (need_ranges_base
14582 /* Value of the DW_AT_ranges attribute is the offset in the
14583 .debug_ranges section. */
14584 if (!dwarf2_ranges_read (ranges_offset, &low, &high, cu, pst))
14585 return PC_BOUNDS_INVALID;
14586 /* Found discontinuous range of addresses. */
14587 ret = PC_BOUNDS_RANGES;
14590 return PC_BOUNDS_NOT_PRESENT;
14593 /* partial_die_info::read has also the strict LOW < HIGH requirement. */
14595 return PC_BOUNDS_INVALID;
14597 /* When using the GNU linker, .gnu.linkonce. sections are used to
14598 eliminate duplicate copies of functions and vtables and such.
14599 The linker will arbitrarily choose one and discard the others.
14600 The AT_*_pc values for such functions refer to local labels in
14601 these sections. If the section from that file was discarded, the
14602 labels are not in the output, so the relocs get a value of 0.
14603 If this is a discarded function, mark the pc bounds as invalid,
14604 so that GDB will ignore it. */
14605 if (low == 0 && !dwarf2_per_objfile->has_section_at_zero)
14606 return PC_BOUNDS_INVALID;
14614 /* Assuming that DIE represents a subprogram DIE or a lexical block, get
14615 its low and high PC addresses. Do nothing if these addresses could not
14616 be determined. Otherwise, set LOWPC to the low address if it is smaller,
14617 and HIGHPC to the high address if greater than HIGHPC. */
14620 dwarf2_get_subprogram_pc_bounds (struct die_info *die,
14621 CORE_ADDR *lowpc, CORE_ADDR *highpc,
14622 struct dwarf2_cu *cu)
14624 CORE_ADDR low, high;
14625 struct die_info *child = die->child;
14627 if (dwarf2_get_pc_bounds (die, &low, &high, cu, NULL) >= PC_BOUNDS_RANGES)
14629 *lowpc = std::min (*lowpc, low);
14630 *highpc = std::max (*highpc, high);
14633 /* If the language does not allow nested subprograms (either inside
14634 subprograms or lexical blocks), we're done. */
14635 if (cu->language != language_ada)
14638 /* Check all the children of the given DIE. If it contains nested
14639 subprograms, then check their pc bounds. Likewise, we need to
14640 check lexical blocks as well, as they may also contain subprogram
14642 while (child && child->tag)
14644 if (child->tag == DW_TAG_subprogram
14645 || child->tag == DW_TAG_lexical_block)
14646 dwarf2_get_subprogram_pc_bounds (child, lowpc, highpc, cu);
14647 child = sibling_die (child);
14651 /* Get the low and high pc's represented by the scope DIE, and store
14652 them in *LOWPC and *HIGHPC. If the correct values can't be
14653 determined, set *LOWPC to -1 and *HIGHPC to 0. */
14656 get_scope_pc_bounds (struct die_info *die,
14657 CORE_ADDR *lowpc, CORE_ADDR *highpc,
14658 struct dwarf2_cu *cu)
14660 CORE_ADDR best_low = (CORE_ADDR) -1;
14661 CORE_ADDR best_high = (CORE_ADDR) 0;
14662 CORE_ADDR current_low, current_high;
14664 if (dwarf2_get_pc_bounds (die, ¤t_low, ¤t_high, cu, NULL)
14665 >= PC_BOUNDS_RANGES)
14667 best_low = current_low;
14668 best_high = current_high;
14672 struct die_info *child = die->child;
14674 while (child && child->tag)
14676 switch (child->tag) {
14677 case DW_TAG_subprogram:
14678 dwarf2_get_subprogram_pc_bounds (child, &best_low, &best_high, cu);
14680 case DW_TAG_namespace:
14681 case DW_TAG_module:
14682 /* FIXME: carlton/2004-01-16: Should we do this for
14683 DW_TAG_class_type/DW_TAG_structure_type, too? I think
14684 that current GCC's always emit the DIEs corresponding
14685 to definitions of methods of classes as children of a
14686 DW_TAG_compile_unit or DW_TAG_namespace (as opposed to
14687 the DIEs giving the declarations, which could be
14688 anywhere). But I don't see any reason why the
14689 standards says that they have to be there. */
14690 get_scope_pc_bounds (child, ¤t_low, ¤t_high, cu);
14692 if (current_low != ((CORE_ADDR) -1))
14694 best_low = std::min (best_low, current_low);
14695 best_high = std::max (best_high, current_high);
14703 child = sibling_die (child);
14708 *highpc = best_high;
14711 /* Record the address ranges for BLOCK, offset by BASEADDR, as given
14715 dwarf2_record_block_ranges (struct die_info *die, struct block *block,
14716 CORE_ADDR baseaddr, struct dwarf2_cu *cu)
14718 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
14719 struct gdbarch *gdbarch = get_objfile_arch (objfile);
14720 struct attribute *attr;
14721 struct attribute *attr_high;
14723 attr_high = dwarf2_attr (die, DW_AT_high_pc, cu);
14726 attr = dwarf2_attr (die, DW_AT_low_pc, cu);
14729 CORE_ADDR low = attr_value_as_address (attr);
14730 CORE_ADDR high = attr_value_as_address (attr_high);
14732 if (cu->header.version >= 4 && attr_form_is_constant (attr_high))
14735 low = gdbarch_adjust_dwarf2_addr (gdbarch, low + baseaddr);
14736 high = gdbarch_adjust_dwarf2_addr (gdbarch, high + baseaddr);
14737 cu->builder->record_block_range (block, low, high - 1);
14741 attr = dwarf2_attr (die, DW_AT_ranges, cu);
14744 /* DW_AT_ranges_base does not apply to DIEs from the DWO skeleton.
14745 We take advantage of the fact that DW_AT_ranges does not appear
14746 in DW_TAG_compile_unit of DWO files. */
14747 int need_ranges_base = die->tag != DW_TAG_compile_unit;
14749 /* The value of the DW_AT_ranges attribute is the offset of the
14750 address range list in the .debug_ranges section. */
14751 unsigned long offset = (DW_UNSND (attr)
14752 + (need_ranges_base ? cu->ranges_base : 0));
14754 dwarf2_ranges_process (offset, cu,
14755 [&] (CORE_ADDR start, CORE_ADDR end)
14759 start = gdbarch_adjust_dwarf2_addr (gdbarch, start);
14760 end = gdbarch_adjust_dwarf2_addr (gdbarch, end);
14761 cu->builder->record_block_range (block, start, end - 1);
14766 /* Check whether the producer field indicates either of GCC < 4.6, or the
14767 Intel C/C++ compiler, and cache the result in CU. */
14770 check_producer (struct dwarf2_cu *cu)
14774 if (cu->producer == NULL)
14776 /* For unknown compilers expect their behavior is DWARF version
14779 GCC started to support .debug_types sections by -gdwarf-4 since
14780 gcc-4.5.x. As the .debug_types sections are missing DW_AT_producer
14781 for their space efficiency GDB cannot workaround gcc-4.5.x -gdwarf-4
14782 combination. gcc-4.5.x -gdwarf-4 binaries have DW_AT_accessibility
14783 interpreted incorrectly by GDB now - GCC PR debug/48229. */
14785 else if (producer_is_gcc (cu->producer, &major, &minor))
14787 cu->producer_is_gxx_lt_4_6 = major < 4 || (major == 4 && minor < 6);
14788 cu->producer_is_gcc_lt_4_3 = major < 4 || (major == 4 && minor < 3);
14790 else if (producer_is_icc (cu->producer, &major, &minor))
14791 cu->producer_is_icc_lt_14 = major < 14;
14794 /* For other non-GCC compilers, expect their behavior is DWARF version
14798 cu->checked_producer = 1;
14801 /* Check for GCC PR debug/45124 fix which is not present in any G++ version up
14802 to 4.5.any while it is present already in G++ 4.6.0 - the PR has been fixed
14803 during 4.6.0 experimental. */
14806 producer_is_gxx_lt_4_6 (struct dwarf2_cu *cu)
14808 if (!cu->checked_producer)
14809 check_producer (cu);
14811 return cu->producer_is_gxx_lt_4_6;
14814 /* Return the default accessibility type if it is not overriden by
14815 DW_AT_accessibility. */
14817 static enum dwarf_access_attribute
14818 dwarf2_default_access_attribute (struct die_info *die, struct dwarf2_cu *cu)
14820 if (cu->header.version < 3 || producer_is_gxx_lt_4_6 (cu))
14822 /* The default DWARF 2 accessibility for members is public, the default
14823 accessibility for inheritance is private. */
14825 if (die->tag != DW_TAG_inheritance)
14826 return DW_ACCESS_public;
14828 return DW_ACCESS_private;
14832 /* DWARF 3+ defines the default accessibility a different way. The same
14833 rules apply now for DW_TAG_inheritance as for the members and it only
14834 depends on the container kind. */
14836 if (die->parent->tag == DW_TAG_class_type)
14837 return DW_ACCESS_private;
14839 return DW_ACCESS_public;
14843 /* Look for DW_AT_data_member_location. Set *OFFSET to the byte
14844 offset. If the attribute was not found return 0, otherwise return
14845 1. If it was found but could not properly be handled, set *OFFSET
14849 handle_data_member_location (struct die_info *die, struct dwarf2_cu *cu,
14852 struct attribute *attr;
14854 attr = dwarf2_attr (die, DW_AT_data_member_location, cu);
14859 /* Note that we do not check for a section offset first here.
14860 This is because DW_AT_data_member_location is new in DWARF 4,
14861 so if we see it, we can assume that a constant form is really
14862 a constant and not a section offset. */
14863 if (attr_form_is_constant (attr))
14864 *offset = dwarf2_get_attr_constant_value (attr, 0);
14865 else if (attr_form_is_section_offset (attr))
14866 dwarf2_complex_location_expr_complaint ();
14867 else if (attr_form_is_block (attr))
14868 *offset = decode_locdesc (DW_BLOCK (attr), cu);
14870 dwarf2_complex_location_expr_complaint ();
14878 /* Add an aggregate field to the field list. */
14881 dwarf2_add_field (struct field_info *fip, struct die_info *die,
14882 struct dwarf2_cu *cu)
14884 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
14885 struct gdbarch *gdbarch = get_objfile_arch (objfile);
14886 struct nextfield *new_field;
14887 struct attribute *attr;
14889 const char *fieldname = "";
14891 if (die->tag == DW_TAG_inheritance)
14893 fip->baseclasses.emplace_back ();
14894 new_field = &fip->baseclasses.back ();
14898 fip->fields.emplace_back ();
14899 new_field = &fip->fields.back ();
14904 attr = dwarf2_attr (die, DW_AT_accessibility, cu);
14906 new_field->accessibility = DW_UNSND (attr);
14908 new_field->accessibility = dwarf2_default_access_attribute (die, cu);
14909 if (new_field->accessibility != DW_ACCESS_public)
14910 fip->non_public_fields = 1;
14912 attr = dwarf2_attr (die, DW_AT_virtuality, cu);
14914 new_field->virtuality = DW_UNSND (attr);
14916 new_field->virtuality = DW_VIRTUALITY_none;
14918 fp = &new_field->field;
14920 if (die->tag == DW_TAG_member && ! die_is_declaration (die, cu))
14924 /* Data member other than a C++ static data member. */
14926 /* Get type of field. */
14927 fp->type = die_type (die, cu);
14929 SET_FIELD_BITPOS (*fp, 0);
14931 /* Get bit size of field (zero if none). */
14932 attr = dwarf2_attr (die, DW_AT_bit_size, cu);
14935 FIELD_BITSIZE (*fp) = DW_UNSND (attr);
14939 FIELD_BITSIZE (*fp) = 0;
14942 /* Get bit offset of field. */
14943 if (handle_data_member_location (die, cu, &offset))
14944 SET_FIELD_BITPOS (*fp, offset * bits_per_byte);
14945 attr = dwarf2_attr (die, DW_AT_bit_offset, cu);
14948 if (gdbarch_bits_big_endian (gdbarch))
14950 /* For big endian bits, the DW_AT_bit_offset gives the
14951 additional bit offset from the MSB of the containing
14952 anonymous object to the MSB of the field. We don't
14953 have to do anything special since we don't need to
14954 know the size of the anonymous object. */
14955 SET_FIELD_BITPOS (*fp, FIELD_BITPOS (*fp) + DW_UNSND (attr));
14959 /* For little endian bits, compute the bit offset to the
14960 MSB of the anonymous object, subtract off the number of
14961 bits from the MSB of the field to the MSB of the
14962 object, and then subtract off the number of bits of
14963 the field itself. The result is the bit offset of
14964 the LSB of the field. */
14965 int anonymous_size;
14966 int bit_offset = DW_UNSND (attr);
14968 attr = dwarf2_attr (die, DW_AT_byte_size, cu);
14971 /* The size of the anonymous object containing
14972 the bit field is explicit, so use the
14973 indicated size (in bytes). */
14974 anonymous_size = DW_UNSND (attr);
14978 /* The size of the anonymous object containing
14979 the bit field must be inferred from the type
14980 attribute of the data member containing the
14982 anonymous_size = TYPE_LENGTH (fp->type);
14984 SET_FIELD_BITPOS (*fp,
14985 (FIELD_BITPOS (*fp)
14986 + anonymous_size * bits_per_byte
14987 - bit_offset - FIELD_BITSIZE (*fp)));
14990 attr = dwarf2_attr (die, DW_AT_data_bit_offset, cu);
14992 SET_FIELD_BITPOS (*fp, (FIELD_BITPOS (*fp)
14993 + dwarf2_get_attr_constant_value (attr, 0)));
14995 /* Get name of field. */
14996 fieldname = dwarf2_name (die, cu);
14997 if (fieldname == NULL)
15000 /* The name is already allocated along with this objfile, so we don't
15001 need to duplicate it for the type. */
15002 fp->name = fieldname;
15004 /* Change accessibility for artificial fields (e.g. virtual table
15005 pointer or virtual base class pointer) to private. */
15006 if (dwarf2_attr (die, DW_AT_artificial, cu))
15008 FIELD_ARTIFICIAL (*fp) = 1;
15009 new_field->accessibility = DW_ACCESS_private;
15010 fip->non_public_fields = 1;
15013 else if (die->tag == DW_TAG_member || die->tag == DW_TAG_variable)
15015 /* C++ static member. */
15017 /* NOTE: carlton/2002-11-05: It should be a DW_TAG_member that
15018 is a declaration, but all versions of G++ as of this writing
15019 (so through at least 3.2.1) incorrectly generate
15020 DW_TAG_variable tags. */
15022 const char *physname;
15024 /* Get name of field. */
15025 fieldname = dwarf2_name (die, cu);
15026 if (fieldname == NULL)
15029 attr = dwarf2_attr (die, DW_AT_const_value, cu);
15031 /* Only create a symbol if this is an external value.
15032 new_symbol checks this and puts the value in the global symbol
15033 table, which we want. If it is not external, new_symbol
15034 will try to put the value in cu->list_in_scope which is wrong. */
15035 && dwarf2_flag_true_p (die, DW_AT_external, cu))
15037 /* A static const member, not much different than an enum as far as
15038 we're concerned, except that we can support more types. */
15039 new_symbol (die, NULL, cu);
15042 /* Get physical name. */
15043 physname = dwarf2_physname (fieldname, die, cu);
15045 /* The name is already allocated along with this objfile, so we don't
15046 need to duplicate it for the type. */
15047 SET_FIELD_PHYSNAME (*fp, physname ? physname : "");
15048 FIELD_TYPE (*fp) = die_type (die, cu);
15049 FIELD_NAME (*fp) = fieldname;
15051 else if (die->tag == DW_TAG_inheritance)
15055 /* C++ base class field. */
15056 if (handle_data_member_location (die, cu, &offset))
15057 SET_FIELD_BITPOS (*fp, offset * bits_per_byte);
15058 FIELD_BITSIZE (*fp) = 0;
15059 FIELD_TYPE (*fp) = die_type (die, cu);
15060 FIELD_NAME (*fp) = TYPE_NAME (fp->type);
15062 else if (die->tag == DW_TAG_variant_part)
15064 /* process_structure_scope will treat this DIE as a union. */
15065 process_structure_scope (die, cu);
15067 /* The variant part is relative to the start of the enclosing
15069 SET_FIELD_BITPOS (*fp, 0);
15070 fp->type = get_die_type (die, cu);
15071 fp->artificial = 1;
15072 fp->name = "<<variant>>";
15075 gdb_assert_not_reached ("missing case in dwarf2_add_field");
15078 /* Can the type given by DIE define another type? */
15081 type_can_define_types (const struct die_info *die)
15085 case DW_TAG_typedef:
15086 case DW_TAG_class_type:
15087 case DW_TAG_structure_type:
15088 case DW_TAG_union_type:
15089 case DW_TAG_enumeration_type:
15097 /* Add a type definition defined in the scope of the FIP's class. */
15100 dwarf2_add_type_defn (struct field_info *fip, struct die_info *die,
15101 struct dwarf2_cu *cu)
15103 struct decl_field fp;
15104 memset (&fp, 0, sizeof (fp));
15106 gdb_assert (type_can_define_types (die));
15108 /* Get name of field. NULL is okay here, meaning an anonymous type. */
15109 fp.name = dwarf2_name (die, cu);
15110 fp.type = read_type_die (die, cu);
15112 /* Save accessibility. */
15113 enum dwarf_access_attribute accessibility;
15114 struct attribute *attr = dwarf2_attr (die, DW_AT_accessibility, cu);
15116 accessibility = (enum dwarf_access_attribute) DW_UNSND (attr);
15118 accessibility = dwarf2_default_access_attribute (die, cu);
15119 switch (accessibility)
15121 case DW_ACCESS_public:
15122 /* The assumed value if neither private nor protected. */
15124 case DW_ACCESS_private:
15127 case DW_ACCESS_protected:
15128 fp.is_protected = 1;
15131 complaint (_("Unhandled DW_AT_accessibility value (%x)"), accessibility);
15134 if (die->tag == DW_TAG_typedef)
15135 fip->typedef_field_list.push_back (fp);
15137 fip->nested_types_list.push_back (fp);
15140 /* Create the vector of fields, and attach it to the type. */
15143 dwarf2_attach_fields_to_type (struct field_info *fip, struct type *type,
15144 struct dwarf2_cu *cu)
15146 int nfields = fip->nfields;
15148 /* Record the field count, allocate space for the array of fields,
15149 and create blank accessibility bitfields if necessary. */
15150 TYPE_NFIELDS (type) = nfields;
15151 TYPE_FIELDS (type) = (struct field *)
15152 TYPE_ZALLOC (type, sizeof (struct field) * nfields);
15154 if (fip->non_public_fields && cu->language != language_ada)
15156 ALLOCATE_CPLUS_STRUCT_TYPE (type);
15158 TYPE_FIELD_PRIVATE_BITS (type) =
15159 (B_TYPE *) TYPE_ALLOC (type, B_BYTES (nfields));
15160 B_CLRALL (TYPE_FIELD_PRIVATE_BITS (type), nfields);
15162 TYPE_FIELD_PROTECTED_BITS (type) =
15163 (B_TYPE *) TYPE_ALLOC (type, B_BYTES (nfields));
15164 B_CLRALL (TYPE_FIELD_PROTECTED_BITS (type), nfields);
15166 TYPE_FIELD_IGNORE_BITS (type) =
15167 (B_TYPE *) TYPE_ALLOC (type, B_BYTES (nfields));
15168 B_CLRALL (TYPE_FIELD_IGNORE_BITS (type), nfields);
15171 /* If the type has baseclasses, allocate and clear a bit vector for
15172 TYPE_FIELD_VIRTUAL_BITS. */
15173 if (!fip->baseclasses.empty () && cu->language != language_ada)
15175 int num_bytes = B_BYTES (fip->baseclasses.size ());
15176 unsigned char *pointer;
15178 ALLOCATE_CPLUS_STRUCT_TYPE (type);
15179 pointer = (unsigned char *) TYPE_ALLOC (type, num_bytes);
15180 TYPE_FIELD_VIRTUAL_BITS (type) = pointer;
15181 B_CLRALL (TYPE_FIELD_VIRTUAL_BITS (type), fip->baseclasses.size ());
15182 TYPE_N_BASECLASSES (type) = fip->baseclasses.size ();
15185 if (TYPE_FLAG_DISCRIMINATED_UNION (type))
15187 struct discriminant_info *di = alloc_discriminant_info (type, -1, -1);
15189 for (int index = 0; index < nfields; ++index)
15191 struct nextfield &field = fip->fields[index];
15193 if (field.variant.is_discriminant)
15194 di->discriminant_index = index;
15195 else if (field.variant.default_branch)
15196 di->default_index = index;
15198 di->discriminants[index] = field.variant.discriminant_value;
15202 /* Copy the saved-up fields into the field vector. */
15203 for (int i = 0; i < nfields; ++i)
15205 struct nextfield &field
15206 = ((i < fip->baseclasses.size ()) ? fip->baseclasses[i]
15207 : fip->fields[i - fip->baseclasses.size ()]);
15209 TYPE_FIELD (type, i) = field.field;
15210 switch (field.accessibility)
15212 case DW_ACCESS_private:
15213 if (cu->language != language_ada)
15214 SET_TYPE_FIELD_PRIVATE (type, i);
15217 case DW_ACCESS_protected:
15218 if (cu->language != language_ada)
15219 SET_TYPE_FIELD_PROTECTED (type, i);
15222 case DW_ACCESS_public:
15226 /* Unknown accessibility. Complain and treat it as public. */
15228 complaint (_("unsupported accessibility %d"),
15229 field.accessibility);
15233 if (i < fip->baseclasses.size ())
15235 switch (field.virtuality)
15237 case DW_VIRTUALITY_virtual:
15238 case DW_VIRTUALITY_pure_virtual:
15239 if (cu->language == language_ada)
15240 error (_("unexpected virtuality in component of Ada type"));
15241 SET_TYPE_FIELD_VIRTUAL (type, i);
15248 /* Return true if this member function is a constructor, false
15252 dwarf2_is_constructor (struct die_info *die, struct dwarf2_cu *cu)
15254 const char *fieldname;
15255 const char *type_name;
15258 if (die->parent == NULL)
15261 if (die->parent->tag != DW_TAG_structure_type
15262 && die->parent->tag != DW_TAG_union_type
15263 && die->parent->tag != DW_TAG_class_type)
15266 fieldname = dwarf2_name (die, cu);
15267 type_name = dwarf2_name (die->parent, cu);
15268 if (fieldname == NULL || type_name == NULL)
15271 len = strlen (fieldname);
15272 return (strncmp (fieldname, type_name, len) == 0
15273 && (type_name[len] == '\0' || type_name[len] == '<'));
15276 /* Add a member function to the proper fieldlist. */
15279 dwarf2_add_member_fn (struct field_info *fip, struct die_info *die,
15280 struct type *type, struct dwarf2_cu *cu)
15282 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
15283 struct attribute *attr;
15285 struct fnfieldlist *flp = nullptr;
15286 struct fn_field *fnp;
15287 const char *fieldname;
15288 struct type *this_type;
15289 enum dwarf_access_attribute accessibility;
15291 if (cu->language == language_ada)
15292 error (_("unexpected member function in Ada type"));
15294 /* Get name of member function. */
15295 fieldname = dwarf2_name (die, cu);
15296 if (fieldname == NULL)
15299 /* Look up member function name in fieldlist. */
15300 for (i = 0; i < fip->fnfieldlists.size (); i++)
15302 if (strcmp (fip->fnfieldlists[i].name, fieldname) == 0)
15304 flp = &fip->fnfieldlists[i];
15309 /* Create a new fnfieldlist if necessary. */
15310 if (flp == nullptr)
15312 fip->fnfieldlists.emplace_back ();
15313 flp = &fip->fnfieldlists.back ();
15314 flp->name = fieldname;
15315 i = fip->fnfieldlists.size () - 1;
15318 /* Create a new member function field and add it to the vector of
15320 flp->fnfields.emplace_back ();
15321 fnp = &flp->fnfields.back ();
15323 /* Delay processing of the physname until later. */
15324 if (cu->language == language_cplus)
15325 add_to_method_list (type, i, flp->fnfields.size () - 1, fieldname,
15329 const char *physname = dwarf2_physname (fieldname, die, cu);
15330 fnp->physname = physname ? physname : "";
15333 fnp->type = alloc_type (objfile);
15334 this_type = read_type_die (die, cu);
15335 if (this_type && TYPE_CODE (this_type) == TYPE_CODE_FUNC)
15337 int nparams = TYPE_NFIELDS (this_type);
15339 /* TYPE is the domain of this method, and THIS_TYPE is the type
15340 of the method itself (TYPE_CODE_METHOD). */
15341 smash_to_method_type (fnp->type, type,
15342 TYPE_TARGET_TYPE (this_type),
15343 TYPE_FIELDS (this_type),
15344 TYPE_NFIELDS (this_type),
15345 TYPE_VARARGS (this_type));
15347 /* Handle static member functions.
15348 Dwarf2 has no clean way to discern C++ static and non-static
15349 member functions. G++ helps GDB by marking the first
15350 parameter for non-static member functions (which is the this
15351 pointer) as artificial. We obtain this information from
15352 read_subroutine_type via TYPE_FIELD_ARTIFICIAL. */
15353 if (nparams == 0 || TYPE_FIELD_ARTIFICIAL (this_type, 0) == 0)
15354 fnp->voffset = VOFFSET_STATIC;
15357 complaint (_("member function type missing for '%s'"),
15358 dwarf2_full_name (fieldname, die, cu));
15360 /* Get fcontext from DW_AT_containing_type if present. */
15361 if (dwarf2_attr (die, DW_AT_containing_type, cu) != NULL)
15362 fnp->fcontext = die_containing_type (die, cu);
15364 /* dwarf2 doesn't have stubbed physical names, so the setting of is_const and
15365 is_volatile is irrelevant, as it is needed by gdb_mangle_name only. */
15367 /* Get accessibility. */
15368 attr = dwarf2_attr (die, DW_AT_accessibility, cu);
15370 accessibility = (enum dwarf_access_attribute) DW_UNSND (attr);
15372 accessibility = dwarf2_default_access_attribute (die, cu);
15373 switch (accessibility)
15375 case DW_ACCESS_private:
15376 fnp->is_private = 1;
15378 case DW_ACCESS_protected:
15379 fnp->is_protected = 1;
15383 /* Check for artificial methods. */
15384 attr = dwarf2_attr (die, DW_AT_artificial, cu);
15385 if (attr && DW_UNSND (attr) != 0)
15386 fnp->is_artificial = 1;
15388 fnp->is_constructor = dwarf2_is_constructor (die, cu);
15390 /* Get index in virtual function table if it is a virtual member
15391 function. For older versions of GCC, this is an offset in the
15392 appropriate virtual table, as specified by DW_AT_containing_type.
15393 For everyone else, it is an expression to be evaluated relative
15394 to the object address. */
15396 attr = dwarf2_attr (die, DW_AT_vtable_elem_location, cu);
15399 if (attr_form_is_block (attr) && DW_BLOCK (attr)->size > 0)
15401 if (DW_BLOCK (attr)->data[0] == DW_OP_constu)
15403 /* Old-style GCC. */
15404 fnp->voffset = decode_locdesc (DW_BLOCK (attr), cu) + 2;
15406 else if (DW_BLOCK (attr)->data[0] == DW_OP_deref
15407 || (DW_BLOCK (attr)->size > 1
15408 && DW_BLOCK (attr)->data[0] == DW_OP_deref_size
15409 && DW_BLOCK (attr)->data[1] == cu->header.addr_size))
15411 fnp->voffset = decode_locdesc (DW_BLOCK (attr), cu);
15412 if ((fnp->voffset % cu->header.addr_size) != 0)
15413 dwarf2_complex_location_expr_complaint ();
15415 fnp->voffset /= cu->header.addr_size;
15419 dwarf2_complex_location_expr_complaint ();
15421 if (!fnp->fcontext)
15423 /* If there is no `this' field and no DW_AT_containing_type,
15424 we cannot actually find a base class context for the
15426 if (TYPE_NFIELDS (this_type) == 0
15427 || !TYPE_FIELD_ARTIFICIAL (this_type, 0))
15429 complaint (_("cannot determine context for virtual member "
15430 "function \"%s\" (offset %s)"),
15431 fieldname, sect_offset_str (die->sect_off));
15436 = TYPE_TARGET_TYPE (TYPE_FIELD_TYPE (this_type, 0));
15440 else if (attr_form_is_section_offset (attr))
15442 dwarf2_complex_location_expr_complaint ();
15446 dwarf2_invalid_attrib_class_complaint ("DW_AT_vtable_elem_location",
15452 attr = dwarf2_attr (die, DW_AT_virtuality, cu);
15453 if (attr && DW_UNSND (attr))
15455 /* GCC does this, as of 2008-08-25; PR debug/37237. */
15456 complaint (_("Member function \"%s\" (offset %s) is virtual "
15457 "but the vtable offset is not specified"),
15458 fieldname, sect_offset_str (die->sect_off));
15459 ALLOCATE_CPLUS_STRUCT_TYPE (type);
15460 TYPE_CPLUS_DYNAMIC (type) = 1;
15465 /* Create the vector of member function fields, and attach it to the type. */
15468 dwarf2_attach_fn_fields_to_type (struct field_info *fip, struct type *type,
15469 struct dwarf2_cu *cu)
15471 if (cu->language == language_ada)
15472 error (_("unexpected member functions in Ada type"));
15474 ALLOCATE_CPLUS_STRUCT_TYPE (type);
15475 TYPE_FN_FIELDLISTS (type) = (struct fn_fieldlist *)
15477 sizeof (struct fn_fieldlist) * fip->fnfieldlists.size ());
15479 for (int i = 0; i < fip->fnfieldlists.size (); i++)
15481 struct fnfieldlist &nf = fip->fnfieldlists[i];
15482 struct fn_fieldlist *fn_flp = &TYPE_FN_FIELDLIST (type, i);
15484 TYPE_FN_FIELDLIST_NAME (type, i) = nf.name;
15485 TYPE_FN_FIELDLIST_LENGTH (type, i) = nf.fnfields.size ();
15486 fn_flp->fn_fields = (struct fn_field *)
15487 TYPE_ALLOC (type, sizeof (struct fn_field) * nf.fnfields.size ());
15489 for (int k = 0; k < nf.fnfields.size (); ++k)
15490 fn_flp->fn_fields[k] = nf.fnfields[k];
15493 TYPE_NFN_FIELDS (type) = fip->fnfieldlists.size ();
15496 /* Returns non-zero if NAME is the name of a vtable member in CU's
15497 language, zero otherwise. */
15499 is_vtable_name (const char *name, struct dwarf2_cu *cu)
15501 static const char vptr[] = "_vptr";
15503 /* Look for the C++ form of the vtable. */
15504 if (startswith (name, vptr) && is_cplus_marker (name[sizeof (vptr) - 1]))
15510 /* GCC outputs unnamed structures that are really pointers to member
15511 functions, with the ABI-specified layout. If TYPE describes
15512 such a structure, smash it into a member function type.
15514 GCC shouldn't do this; it should just output pointer to member DIEs.
15515 This is GCC PR debug/28767. */
15518 quirk_gcc_member_function_pointer (struct type *type, struct objfile *objfile)
15520 struct type *pfn_type, *self_type, *new_type;
15522 /* Check for a structure with no name and two children. */
15523 if (TYPE_CODE (type) != TYPE_CODE_STRUCT || TYPE_NFIELDS (type) != 2)
15526 /* Check for __pfn and __delta members. */
15527 if (TYPE_FIELD_NAME (type, 0) == NULL
15528 || strcmp (TYPE_FIELD_NAME (type, 0), "__pfn") != 0
15529 || TYPE_FIELD_NAME (type, 1) == NULL
15530 || strcmp (TYPE_FIELD_NAME (type, 1), "__delta") != 0)
15533 /* Find the type of the method. */
15534 pfn_type = TYPE_FIELD_TYPE (type, 0);
15535 if (pfn_type == NULL
15536 || TYPE_CODE (pfn_type) != TYPE_CODE_PTR
15537 || TYPE_CODE (TYPE_TARGET_TYPE (pfn_type)) != TYPE_CODE_FUNC)
15540 /* Look for the "this" argument. */
15541 pfn_type = TYPE_TARGET_TYPE (pfn_type);
15542 if (TYPE_NFIELDS (pfn_type) == 0
15543 /* || TYPE_FIELD_TYPE (pfn_type, 0) == NULL */
15544 || TYPE_CODE (TYPE_FIELD_TYPE (pfn_type, 0)) != TYPE_CODE_PTR)
15547 self_type = TYPE_TARGET_TYPE (TYPE_FIELD_TYPE (pfn_type, 0));
15548 new_type = alloc_type (objfile);
15549 smash_to_method_type (new_type, self_type, TYPE_TARGET_TYPE (pfn_type),
15550 TYPE_FIELDS (pfn_type), TYPE_NFIELDS (pfn_type),
15551 TYPE_VARARGS (pfn_type));
15552 smash_to_methodptr_type (type, new_type);
15555 /* If the DIE has a DW_AT_alignment attribute, return its value, doing
15556 appropriate error checking and issuing complaints if there is a
15560 get_alignment (struct dwarf2_cu *cu, struct die_info *die)
15562 struct attribute *attr = dwarf2_attr (die, DW_AT_alignment, cu);
15564 if (attr == nullptr)
15567 if (!attr_form_is_constant (attr))
15569 complaint (_("DW_AT_alignment must have constant form"
15570 " - DIE at %s [in module %s]"),
15571 sect_offset_str (die->sect_off),
15572 objfile_name (cu->per_cu->dwarf2_per_objfile->objfile));
15577 if (attr->form == DW_FORM_sdata)
15579 LONGEST val = DW_SND (attr);
15582 complaint (_("DW_AT_alignment value must not be negative"
15583 " - DIE at %s [in module %s]"),
15584 sect_offset_str (die->sect_off),
15585 objfile_name (cu->per_cu->dwarf2_per_objfile->objfile));
15591 align = DW_UNSND (attr);
15595 complaint (_("DW_AT_alignment value must not be zero"
15596 " - DIE at %s [in module %s]"),
15597 sect_offset_str (die->sect_off),
15598 objfile_name (cu->per_cu->dwarf2_per_objfile->objfile));
15601 if ((align & (align - 1)) != 0)
15603 complaint (_("DW_AT_alignment value must be a power of 2"
15604 " - DIE at %s [in module %s]"),
15605 sect_offset_str (die->sect_off),
15606 objfile_name (cu->per_cu->dwarf2_per_objfile->objfile));
15613 /* If the DIE has a DW_AT_alignment attribute, use its value to set
15614 the alignment for TYPE. */
15617 maybe_set_alignment (struct dwarf2_cu *cu, struct die_info *die,
15620 if (!set_type_align (type, get_alignment (cu, die)))
15621 complaint (_("DW_AT_alignment value too large"
15622 " - DIE at %s [in module %s]"),
15623 sect_offset_str (die->sect_off),
15624 objfile_name (cu->per_cu->dwarf2_per_objfile->objfile));
15627 /* Called when we find the DIE that starts a structure or union scope
15628 (definition) to create a type for the structure or union. Fill in
15629 the type's name and general properties; the members will not be
15630 processed until process_structure_scope. A symbol table entry for
15631 the type will also not be done until process_structure_scope (assuming
15632 the type has a name).
15634 NOTE: we need to call these functions regardless of whether or not the
15635 DIE has a DW_AT_name attribute, since it might be an anonymous
15636 structure or union. This gets the type entered into our set of
15637 user defined types. */
15639 static struct type *
15640 read_structure_type (struct die_info *die, struct dwarf2_cu *cu)
15642 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
15644 struct attribute *attr;
15647 /* If the definition of this type lives in .debug_types, read that type.
15648 Don't follow DW_AT_specification though, that will take us back up
15649 the chain and we want to go down. */
15650 attr = dwarf2_attr_no_follow (die, DW_AT_signature);
15653 type = get_DW_AT_signature_type (die, attr, cu);
15655 /* The type's CU may not be the same as CU.
15656 Ensure TYPE is recorded with CU in die_type_hash. */
15657 return set_die_type (die, type, cu);
15660 type = alloc_type (objfile);
15661 INIT_CPLUS_SPECIFIC (type);
15663 name = dwarf2_name (die, cu);
15666 if (cu->language == language_cplus
15667 || cu->language == language_d
15668 || cu->language == language_rust)
15670 const char *full_name = dwarf2_full_name (name, die, cu);
15672 /* dwarf2_full_name might have already finished building the DIE's
15673 type. If so, there is no need to continue. */
15674 if (get_die_type (die, cu) != NULL)
15675 return get_die_type (die, cu);
15677 TYPE_NAME (type) = full_name;
15681 /* The name is already allocated along with this objfile, so
15682 we don't need to duplicate it for the type. */
15683 TYPE_NAME (type) = name;
15687 if (die->tag == DW_TAG_structure_type)
15689 TYPE_CODE (type) = TYPE_CODE_STRUCT;
15691 else if (die->tag == DW_TAG_union_type)
15693 TYPE_CODE (type) = TYPE_CODE_UNION;
15695 else if (die->tag == DW_TAG_variant_part)
15697 TYPE_CODE (type) = TYPE_CODE_UNION;
15698 TYPE_FLAG_DISCRIMINATED_UNION (type) = 1;
15702 TYPE_CODE (type) = TYPE_CODE_STRUCT;
15705 if (cu->language == language_cplus && die->tag == DW_TAG_class_type)
15706 TYPE_DECLARED_CLASS (type) = 1;
15708 attr = dwarf2_attr (die, DW_AT_byte_size, cu);
15711 if (attr_form_is_constant (attr))
15712 TYPE_LENGTH (type) = DW_UNSND (attr);
15715 /* For the moment, dynamic type sizes are not supported
15716 by GDB's struct type. The actual size is determined
15717 on-demand when resolving the type of a given object,
15718 so set the type's length to zero for now. Otherwise,
15719 we record an expression as the length, and that expression
15720 could lead to a very large value, which could eventually
15721 lead to us trying to allocate that much memory when creating
15722 a value of that type. */
15723 TYPE_LENGTH (type) = 0;
15728 TYPE_LENGTH (type) = 0;
15731 maybe_set_alignment (cu, die, type);
15733 if (producer_is_icc_lt_14 (cu) && (TYPE_LENGTH (type) == 0))
15735 /* ICC<14 does not output the required DW_AT_declaration on
15736 incomplete types, but gives them a size of zero. */
15737 TYPE_STUB (type) = 1;
15740 TYPE_STUB_SUPPORTED (type) = 1;
15742 if (die_is_declaration (die, cu))
15743 TYPE_STUB (type) = 1;
15744 else if (attr == NULL && die->child == NULL
15745 && producer_is_realview (cu->producer))
15746 /* RealView does not output the required DW_AT_declaration
15747 on incomplete types. */
15748 TYPE_STUB (type) = 1;
15750 /* We need to add the type field to the die immediately so we don't
15751 infinitely recurse when dealing with pointers to the structure
15752 type within the structure itself. */
15753 set_die_type (die, type, cu);
15755 /* set_die_type should be already done. */
15756 set_descriptive_type (type, die, cu);
15761 /* A helper for process_structure_scope that handles a single member
15765 handle_struct_member_die (struct die_info *child_die, struct type *type,
15766 struct field_info *fi,
15767 std::vector<struct symbol *> *template_args,
15768 struct dwarf2_cu *cu)
15770 if (child_die->tag == DW_TAG_member
15771 || child_die->tag == DW_TAG_variable
15772 || child_die->tag == DW_TAG_variant_part)
15774 /* NOTE: carlton/2002-11-05: A C++ static data member
15775 should be a DW_TAG_member that is a declaration, but
15776 all versions of G++ as of this writing (so through at
15777 least 3.2.1) incorrectly generate DW_TAG_variable
15778 tags for them instead. */
15779 dwarf2_add_field (fi, child_die, cu);
15781 else if (child_die->tag == DW_TAG_subprogram)
15783 /* Rust doesn't have member functions in the C++ sense.
15784 However, it does emit ordinary functions as children
15785 of a struct DIE. */
15786 if (cu->language == language_rust)
15787 read_func_scope (child_die, cu);
15790 /* C++ member function. */
15791 dwarf2_add_member_fn (fi, child_die, type, cu);
15794 else if (child_die->tag == DW_TAG_inheritance)
15796 /* C++ base class field. */
15797 dwarf2_add_field (fi, child_die, cu);
15799 else if (type_can_define_types (child_die))
15800 dwarf2_add_type_defn (fi, child_die, cu);
15801 else if (child_die->tag == DW_TAG_template_type_param
15802 || child_die->tag == DW_TAG_template_value_param)
15804 struct symbol *arg = new_symbol (child_die, NULL, cu);
15807 template_args->push_back (arg);
15809 else if (child_die->tag == DW_TAG_variant)
15811 /* In a variant we want to get the discriminant and also add a
15812 field for our sole member child. */
15813 struct attribute *discr = dwarf2_attr (child_die, DW_AT_discr_value, cu);
15815 for (struct die_info *variant_child = child_die->child;
15816 variant_child != NULL;
15817 variant_child = sibling_die (variant_child))
15819 if (variant_child->tag == DW_TAG_member)
15821 handle_struct_member_die (variant_child, type, fi,
15822 template_args, cu);
15823 /* Only handle the one. */
15828 /* We don't handle this but we might as well report it if we see
15830 if (dwarf2_attr (child_die, DW_AT_discr_list, cu) != nullptr)
15831 complaint (_("DW_AT_discr_list is not supported yet"
15832 " - DIE at %s [in module %s]"),
15833 sect_offset_str (child_die->sect_off),
15834 objfile_name (cu->per_cu->dwarf2_per_objfile->objfile));
15836 /* The first field was just added, so we can stash the
15837 discriminant there. */
15838 gdb_assert (!fi->fields.empty ());
15840 fi->fields.back ().variant.default_branch = true;
15842 fi->fields.back ().variant.discriminant_value = DW_UNSND (discr);
15846 /* Finish creating a structure or union type, including filling in
15847 its members and creating a symbol for it. */
15850 process_structure_scope (struct die_info *die, struct dwarf2_cu *cu)
15852 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
15853 struct die_info *child_die;
15856 type = get_die_type (die, cu);
15858 type = read_structure_type (die, cu);
15860 /* When reading a DW_TAG_variant_part, we need to notice when we
15861 read the discriminant member, so we can record it later in the
15862 discriminant_info. */
15863 bool is_variant_part = TYPE_FLAG_DISCRIMINATED_UNION (type);
15864 sect_offset discr_offset;
15866 if (is_variant_part)
15868 struct attribute *discr = dwarf2_attr (die, DW_AT_discr, cu);
15871 /* Maybe it's a univariant form, an extension we support.
15872 In this case arrange not to check the offset. */
15873 is_variant_part = false;
15875 else if (attr_form_is_ref (discr))
15877 struct dwarf2_cu *target_cu = cu;
15878 struct die_info *target_die = follow_die_ref (die, discr, &target_cu);
15880 discr_offset = target_die->sect_off;
15884 complaint (_("DW_AT_discr does not have DIE reference form"
15885 " - DIE at %s [in module %s]"),
15886 sect_offset_str (die->sect_off),
15887 objfile_name (cu->per_cu->dwarf2_per_objfile->objfile));
15888 is_variant_part = false;
15892 if (die->child != NULL && ! die_is_declaration (die, cu))
15894 struct field_info fi;
15895 std::vector<struct symbol *> template_args;
15897 child_die = die->child;
15899 while (child_die && child_die->tag)
15901 handle_struct_member_die (child_die, type, &fi, &template_args, cu);
15903 if (is_variant_part && discr_offset == child_die->sect_off)
15904 fi.fields.back ().variant.is_discriminant = true;
15906 child_die = sibling_die (child_die);
15909 /* Attach template arguments to type. */
15910 if (!template_args.empty ())
15912 ALLOCATE_CPLUS_STRUCT_TYPE (type);
15913 TYPE_N_TEMPLATE_ARGUMENTS (type) = template_args.size ();
15914 TYPE_TEMPLATE_ARGUMENTS (type)
15915 = XOBNEWVEC (&objfile->objfile_obstack,
15917 TYPE_N_TEMPLATE_ARGUMENTS (type));
15918 memcpy (TYPE_TEMPLATE_ARGUMENTS (type),
15919 template_args.data (),
15920 (TYPE_N_TEMPLATE_ARGUMENTS (type)
15921 * sizeof (struct symbol *)));
15924 /* Attach fields and member functions to the type. */
15926 dwarf2_attach_fields_to_type (&fi, type, cu);
15927 if (!fi.fnfieldlists.empty ())
15929 dwarf2_attach_fn_fields_to_type (&fi, type, cu);
15931 /* Get the type which refers to the base class (possibly this
15932 class itself) which contains the vtable pointer for the current
15933 class from the DW_AT_containing_type attribute. This use of
15934 DW_AT_containing_type is a GNU extension. */
15936 if (dwarf2_attr (die, DW_AT_containing_type, cu) != NULL)
15938 struct type *t = die_containing_type (die, cu);
15940 set_type_vptr_basetype (type, t);
15945 /* Our own class provides vtbl ptr. */
15946 for (i = TYPE_NFIELDS (t) - 1;
15947 i >= TYPE_N_BASECLASSES (t);
15950 const char *fieldname = TYPE_FIELD_NAME (t, i);
15952 if (is_vtable_name (fieldname, cu))
15954 set_type_vptr_fieldno (type, i);
15959 /* Complain if virtual function table field not found. */
15960 if (i < TYPE_N_BASECLASSES (t))
15961 complaint (_("virtual function table pointer "
15962 "not found when defining class '%s'"),
15963 TYPE_NAME (type) ? TYPE_NAME (type) : "");
15967 set_type_vptr_fieldno (type, TYPE_VPTR_FIELDNO (t));
15970 else if (cu->producer
15971 && startswith (cu->producer, "IBM(R) XL C/C++ Advanced Edition"))
15973 /* The IBM XLC compiler does not provide direct indication
15974 of the containing type, but the vtable pointer is
15975 always named __vfp. */
15979 for (i = TYPE_NFIELDS (type) - 1;
15980 i >= TYPE_N_BASECLASSES (type);
15983 if (strcmp (TYPE_FIELD_NAME (type, i), "__vfp") == 0)
15985 set_type_vptr_fieldno (type, i);
15986 set_type_vptr_basetype (type, type);
15993 /* Copy fi.typedef_field_list linked list elements content into the
15994 allocated array TYPE_TYPEDEF_FIELD_ARRAY (type). */
15995 if (!fi.typedef_field_list.empty ())
15997 int count = fi.typedef_field_list.size ();
15999 ALLOCATE_CPLUS_STRUCT_TYPE (type);
16000 TYPE_TYPEDEF_FIELD_ARRAY (type)
16001 = ((struct decl_field *)
16003 sizeof (TYPE_TYPEDEF_FIELD (type, 0)) * count));
16004 TYPE_TYPEDEF_FIELD_COUNT (type) = count;
16006 for (int i = 0; i < fi.typedef_field_list.size (); ++i)
16007 TYPE_TYPEDEF_FIELD (type, i) = fi.typedef_field_list[i];
16010 /* Copy fi.nested_types_list linked list elements content into the
16011 allocated array TYPE_NESTED_TYPES_ARRAY (type). */
16012 if (!fi.nested_types_list.empty () && cu->language != language_ada)
16014 int count = fi.nested_types_list.size ();
16016 ALLOCATE_CPLUS_STRUCT_TYPE (type);
16017 TYPE_NESTED_TYPES_ARRAY (type)
16018 = ((struct decl_field *)
16019 TYPE_ALLOC (type, sizeof (struct decl_field) * count));
16020 TYPE_NESTED_TYPES_COUNT (type) = count;
16022 for (int i = 0; i < fi.nested_types_list.size (); ++i)
16023 TYPE_NESTED_TYPES_FIELD (type, i) = fi.nested_types_list[i];
16027 quirk_gcc_member_function_pointer (type, objfile);
16028 if (cu->language == language_rust && die->tag == DW_TAG_union_type)
16029 cu->rust_unions.push_back (type);
16031 /* NOTE: carlton/2004-03-16: GCC 3.4 (or at least one of its
16032 snapshots) has been known to create a die giving a declaration
16033 for a class that has, as a child, a die giving a definition for a
16034 nested class. So we have to process our children even if the
16035 current die is a declaration. Normally, of course, a declaration
16036 won't have any children at all. */
16038 child_die = die->child;
16040 while (child_die != NULL && child_die->tag)
16042 if (child_die->tag == DW_TAG_member
16043 || child_die->tag == DW_TAG_variable
16044 || child_die->tag == DW_TAG_inheritance
16045 || child_die->tag == DW_TAG_template_value_param
16046 || child_die->tag == DW_TAG_template_type_param)
16051 process_die (child_die, cu);
16053 child_die = sibling_die (child_die);
16056 /* Do not consider external references. According to the DWARF standard,
16057 these DIEs are identified by the fact that they have no byte_size
16058 attribute, and a declaration attribute. */
16059 if (dwarf2_attr (die, DW_AT_byte_size, cu) != NULL
16060 || !die_is_declaration (die, cu))
16061 new_symbol (die, type, cu);
16064 /* Assuming DIE is an enumeration type, and TYPE is its associated type,
16065 update TYPE using some information only available in DIE's children. */
16068 update_enumeration_type_from_children (struct die_info *die,
16070 struct dwarf2_cu *cu)
16072 struct die_info *child_die;
16073 int unsigned_enum = 1;
16077 auto_obstack obstack;
16079 for (child_die = die->child;
16080 child_die != NULL && child_die->tag;
16081 child_die = sibling_die (child_die))
16083 struct attribute *attr;
16085 const gdb_byte *bytes;
16086 struct dwarf2_locexpr_baton *baton;
16089 if (child_die->tag != DW_TAG_enumerator)
16092 attr = dwarf2_attr (child_die, DW_AT_const_value, cu);
16096 name = dwarf2_name (child_die, cu);
16098 name = "<anonymous enumerator>";
16100 dwarf2_const_value_attr (attr, type, name, &obstack, cu,
16101 &value, &bytes, &baton);
16107 else if ((mask & value) != 0)
16112 /* If we already know that the enum type is neither unsigned, nor
16113 a flag type, no need to look at the rest of the enumerates. */
16114 if (!unsigned_enum && !flag_enum)
16119 TYPE_UNSIGNED (type) = 1;
16121 TYPE_FLAG_ENUM (type) = 1;
16124 /* Given a DW_AT_enumeration_type die, set its type. We do not
16125 complete the type's fields yet, or create any symbols. */
16127 static struct type *
16128 read_enumeration_type (struct die_info *die, struct dwarf2_cu *cu)
16130 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
16132 struct attribute *attr;
16135 /* If the definition of this type lives in .debug_types, read that type.
16136 Don't follow DW_AT_specification though, that will take us back up
16137 the chain and we want to go down. */
16138 attr = dwarf2_attr_no_follow (die, DW_AT_signature);
16141 type = get_DW_AT_signature_type (die, attr, cu);
16143 /* The type's CU may not be the same as CU.
16144 Ensure TYPE is recorded with CU in die_type_hash. */
16145 return set_die_type (die, type, cu);
16148 type = alloc_type (objfile);
16150 TYPE_CODE (type) = TYPE_CODE_ENUM;
16151 name = dwarf2_full_name (NULL, die, cu);
16153 TYPE_NAME (type) = name;
16155 attr = dwarf2_attr (die, DW_AT_type, cu);
16158 struct type *underlying_type = die_type (die, cu);
16160 TYPE_TARGET_TYPE (type) = underlying_type;
16163 attr = dwarf2_attr (die, DW_AT_byte_size, cu);
16166 TYPE_LENGTH (type) = DW_UNSND (attr);
16170 TYPE_LENGTH (type) = 0;
16173 maybe_set_alignment (cu, die, type);
16175 /* The enumeration DIE can be incomplete. In Ada, any type can be
16176 declared as private in the package spec, and then defined only
16177 inside the package body. Such types are known as Taft Amendment
16178 Types. When another package uses such a type, an incomplete DIE
16179 may be generated by the compiler. */
16180 if (die_is_declaration (die, cu))
16181 TYPE_STUB (type) = 1;
16183 /* Finish the creation of this type by using the enum's children.
16184 We must call this even when the underlying type has been provided
16185 so that we can determine if we're looking at a "flag" enum. */
16186 update_enumeration_type_from_children (die, type, cu);
16188 /* If this type has an underlying type that is not a stub, then we
16189 may use its attributes. We always use the "unsigned" attribute
16190 in this situation, because ordinarily we guess whether the type
16191 is unsigned -- but the guess can be wrong and the underlying type
16192 can tell us the reality. However, we defer to a local size
16193 attribute if one exists, because this lets the compiler override
16194 the underlying type if needed. */
16195 if (TYPE_TARGET_TYPE (type) != NULL && !TYPE_STUB (TYPE_TARGET_TYPE (type)))
16197 TYPE_UNSIGNED (type) = TYPE_UNSIGNED (TYPE_TARGET_TYPE (type));
16198 if (TYPE_LENGTH (type) == 0)
16199 TYPE_LENGTH (type) = TYPE_LENGTH (TYPE_TARGET_TYPE (type));
16200 if (TYPE_RAW_ALIGN (type) == 0
16201 && TYPE_RAW_ALIGN (TYPE_TARGET_TYPE (type)) != 0)
16202 set_type_align (type, TYPE_RAW_ALIGN (TYPE_TARGET_TYPE (type)));
16205 TYPE_DECLARED_CLASS (type) = dwarf2_flag_true_p (die, DW_AT_enum_class, cu);
16207 return set_die_type (die, type, cu);
16210 /* Given a pointer to a die which begins an enumeration, process all
16211 the dies that define the members of the enumeration, and create the
16212 symbol for the enumeration type.
16214 NOTE: We reverse the order of the element list. */
16217 process_enumeration_scope (struct die_info *die, struct dwarf2_cu *cu)
16219 struct type *this_type;
16221 this_type = get_die_type (die, cu);
16222 if (this_type == NULL)
16223 this_type = read_enumeration_type (die, cu);
16225 if (die->child != NULL)
16227 struct die_info *child_die;
16228 struct symbol *sym;
16229 struct field *fields = NULL;
16230 int num_fields = 0;
16233 child_die = die->child;
16234 while (child_die && child_die->tag)
16236 if (child_die->tag != DW_TAG_enumerator)
16238 process_die (child_die, cu);
16242 name = dwarf2_name (child_die, cu);
16245 sym = new_symbol (child_die, this_type, cu);
16247 if ((num_fields % DW_FIELD_ALLOC_CHUNK) == 0)
16249 fields = (struct field *)
16251 (num_fields + DW_FIELD_ALLOC_CHUNK)
16252 * sizeof (struct field));
16255 FIELD_NAME (fields[num_fields]) = SYMBOL_LINKAGE_NAME (sym);
16256 FIELD_TYPE (fields[num_fields]) = NULL;
16257 SET_FIELD_ENUMVAL (fields[num_fields], SYMBOL_VALUE (sym));
16258 FIELD_BITSIZE (fields[num_fields]) = 0;
16264 child_die = sibling_die (child_die);
16269 TYPE_NFIELDS (this_type) = num_fields;
16270 TYPE_FIELDS (this_type) = (struct field *)
16271 TYPE_ALLOC (this_type, sizeof (struct field) * num_fields);
16272 memcpy (TYPE_FIELDS (this_type), fields,
16273 sizeof (struct field) * num_fields);
16278 /* If we are reading an enum from a .debug_types unit, and the enum
16279 is a declaration, and the enum is not the signatured type in the
16280 unit, then we do not want to add a symbol for it. Adding a
16281 symbol would in some cases obscure the true definition of the
16282 enum, giving users an incomplete type when the definition is
16283 actually available. Note that we do not want to do this for all
16284 enums which are just declarations, because C++0x allows forward
16285 enum declarations. */
16286 if (cu->per_cu->is_debug_types
16287 && die_is_declaration (die, cu))
16289 struct signatured_type *sig_type;
16291 sig_type = (struct signatured_type *) cu->per_cu;
16292 gdb_assert (to_underlying (sig_type->type_offset_in_section) != 0);
16293 if (sig_type->type_offset_in_section != die->sect_off)
16297 new_symbol (die, this_type, cu);
16300 /* Extract all information from a DW_TAG_array_type DIE and put it in
16301 the DIE's type field. For now, this only handles one dimensional
16304 static struct type *
16305 read_array_type (struct die_info *die, struct dwarf2_cu *cu)
16307 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
16308 struct die_info *child_die;
16310 struct type *element_type, *range_type, *index_type;
16311 struct attribute *attr;
16313 struct dynamic_prop *byte_stride_prop = NULL;
16314 unsigned int bit_stride = 0;
16316 element_type = die_type (die, cu);
16318 /* The die_type call above may have already set the type for this DIE. */
16319 type = get_die_type (die, cu);
16323 attr = dwarf2_attr (die, DW_AT_byte_stride, cu);
16329 = (struct dynamic_prop *) alloca (sizeof (struct dynamic_prop));
16330 stride_ok = attr_to_dynamic_prop (attr, die, cu, byte_stride_prop);
16333 complaint (_("unable to read array DW_AT_byte_stride "
16334 " - DIE at %s [in module %s]"),
16335 sect_offset_str (die->sect_off),
16336 objfile_name (cu->per_cu->dwarf2_per_objfile->objfile));
16337 /* Ignore this attribute. We will likely not be able to print
16338 arrays of this type correctly, but there is little we can do
16339 to help if we cannot read the attribute's value. */
16340 byte_stride_prop = NULL;
16344 attr = dwarf2_attr (die, DW_AT_bit_stride, cu);
16346 bit_stride = DW_UNSND (attr);
16348 /* Irix 6.2 native cc creates array types without children for
16349 arrays with unspecified length. */
16350 if (die->child == NULL)
16352 index_type = objfile_type (objfile)->builtin_int;
16353 range_type = create_static_range_type (NULL, index_type, 0, -1);
16354 type = create_array_type_with_stride (NULL, element_type, range_type,
16355 byte_stride_prop, bit_stride);
16356 return set_die_type (die, type, cu);
16359 std::vector<struct type *> range_types;
16360 child_die = die->child;
16361 while (child_die && child_die->tag)
16363 if (child_die->tag == DW_TAG_subrange_type)
16365 struct type *child_type = read_type_die (child_die, cu);
16367 if (child_type != NULL)
16369 /* The range type was succesfully read. Save it for the
16370 array type creation. */
16371 range_types.push_back (child_type);
16374 child_die = sibling_die (child_die);
16377 /* Dwarf2 dimensions are output from left to right, create the
16378 necessary array types in backwards order. */
16380 type = element_type;
16382 if (read_array_order (die, cu) == DW_ORD_col_major)
16386 while (i < range_types.size ())
16387 type = create_array_type_with_stride (NULL, type, range_types[i++],
16388 byte_stride_prop, bit_stride);
16392 size_t ndim = range_types.size ();
16394 type = create_array_type_with_stride (NULL, type, range_types[ndim],
16395 byte_stride_prop, bit_stride);
16398 /* Understand Dwarf2 support for vector types (like they occur on
16399 the PowerPC w/ AltiVec). Gcc just adds another attribute to the
16400 array type. This is not part of the Dwarf2/3 standard yet, but a
16401 custom vendor extension. The main difference between a regular
16402 array and the vector variant is that vectors are passed by value
16404 attr = dwarf2_attr (die, DW_AT_GNU_vector, cu);
16406 make_vector_type (type);
16408 /* The DIE may have DW_AT_byte_size set. For example an OpenCL
16409 implementation may choose to implement triple vectors using this
16411 attr = dwarf2_attr (die, DW_AT_byte_size, cu);
16414 if (DW_UNSND (attr) >= TYPE_LENGTH (type))
16415 TYPE_LENGTH (type) = DW_UNSND (attr);
16417 complaint (_("DW_AT_byte_size for array type smaller "
16418 "than the total size of elements"));
16421 name = dwarf2_name (die, cu);
16423 TYPE_NAME (type) = name;
16425 maybe_set_alignment (cu, die, type);
16427 /* Install the type in the die. */
16428 set_die_type (die, type, cu);
16430 /* set_die_type should be already done. */
16431 set_descriptive_type (type, die, cu);
16436 static enum dwarf_array_dim_ordering
16437 read_array_order (struct die_info *die, struct dwarf2_cu *cu)
16439 struct attribute *attr;
16441 attr = dwarf2_attr (die, DW_AT_ordering, cu);
16444 return (enum dwarf_array_dim_ordering) DW_SND (attr);
16446 /* GNU F77 is a special case, as at 08/2004 array type info is the
16447 opposite order to the dwarf2 specification, but data is still
16448 laid out as per normal fortran.
16450 FIXME: dsl/2004-8-20: If G77 is ever fixed, this will also need
16451 version checking. */
16453 if (cu->language == language_fortran
16454 && cu->producer && strstr (cu->producer, "GNU F77"))
16456 return DW_ORD_row_major;
16459 switch (cu->language_defn->la_array_ordering)
16461 case array_column_major:
16462 return DW_ORD_col_major;
16463 case array_row_major:
16465 return DW_ORD_row_major;
16469 /* Extract all information from a DW_TAG_set_type DIE and put it in
16470 the DIE's type field. */
16472 static struct type *
16473 read_set_type (struct die_info *die, struct dwarf2_cu *cu)
16475 struct type *domain_type, *set_type;
16476 struct attribute *attr;
16478 domain_type = die_type (die, cu);
16480 /* The die_type call above may have already set the type for this DIE. */
16481 set_type = get_die_type (die, cu);
16485 set_type = create_set_type (NULL, domain_type);
16487 attr = dwarf2_attr (die, DW_AT_byte_size, cu);
16489 TYPE_LENGTH (set_type) = DW_UNSND (attr);
16491 maybe_set_alignment (cu, die, set_type);
16493 return set_die_type (die, set_type, cu);
16496 /* A helper for read_common_block that creates a locexpr baton.
16497 SYM is the symbol which we are marking as computed.
16498 COMMON_DIE is the DIE for the common block.
16499 COMMON_LOC is the location expression attribute for the common
16501 MEMBER_LOC is the location expression attribute for the particular
16502 member of the common block that we are processing.
16503 CU is the CU from which the above come. */
16506 mark_common_block_symbol_computed (struct symbol *sym,
16507 struct die_info *common_die,
16508 struct attribute *common_loc,
16509 struct attribute *member_loc,
16510 struct dwarf2_cu *cu)
16512 struct dwarf2_per_objfile *dwarf2_per_objfile
16513 = cu->per_cu->dwarf2_per_objfile;
16514 struct objfile *objfile = dwarf2_per_objfile->objfile;
16515 struct dwarf2_locexpr_baton *baton;
16517 unsigned int cu_off;
16518 enum bfd_endian byte_order = gdbarch_byte_order (get_objfile_arch (objfile));
16519 LONGEST offset = 0;
16521 gdb_assert (common_loc && member_loc);
16522 gdb_assert (attr_form_is_block (common_loc));
16523 gdb_assert (attr_form_is_block (member_loc)
16524 || attr_form_is_constant (member_loc));
16526 baton = XOBNEW (&objfile->objfile_obstack, struct dwarf2_locexpr_baton);
16527 baton->per_cu = cu->per_cu;
16528 gdb_assert (baton->per_cu);
16530 baton->size = 5 /* DW_OP_call4 */ + 1 /* DW_OP_plus */;
16532 if (attr_form_is_constant (member_loc))
16534 offset = dwarf2_get_attr_constant_value (member_loc, 0);
16535 baton->size += 1 /* DW_OP_addr */ + cu->header.addr_size;
16538 baton->size += DW_BLOCK (member_loc)->size;
16540 ptr = (gdb_byte *) obstack_alloc (&objfile->objfile_obstack, baton->size);
16543 *ptr++ = DW_OP_call4;
16544 cu_off = common_die->sect_off - cu->per_cu->sect_off;
16545 store_unsigned_integer (ptr, 4, byte_order, cu_off);
16548 if (attr_form_is_constant (member_loc))
16550 *ptr++ = DW_OP_addr;
16551 store_unsigned_integer (ptr, cu->header.addr_size, byte_order, offset);
16552 ptr += cu->header.addr_size;
16556 /* We have to copy the data here, because DW_OP_call4 will only
16557 use a DW_AT_location attribute. */
16558 memcpy (ptr, DW_BLOCK (member_loc)->data, DW_BLOCK (member_loc)->size);
16559 ptr += DW_BLOCK (member_loc)->size;
16562 *ptr++ = DW_OP_plus;
16563 gdb_assert (ptr - baton->data == baton->size);
16565 SYMBOL_LOCATION_BATON (sym) = baton;
16566 SYMBOL_ACLASS_INDEX (sym) = dwarf2_locexpr_index;
16569 /* Create appropriate locally-scoped variables for all the
16570 DW_TAG_common_block entries. Also create a struct common_block
16571 listing all such variables for `info common'. COMMON_BLOCK_DOMAIN
16572 is used to sepate the common blocks name namespace from regular
16576 read_common_block (struct die_info *die, struct dwarf2_cu *cu)
16578 struct attribute *attr;
16580 attr = dwarf2_attr (die, DW_AT_location, cu);
16583 /* Support the .debug_loc offsets. */
16584 if (attr_form_is_block (attr))
16588 else if (attr_form_is_section_offset (attr))
16590 dwarf2_complex_location_expr_complaint ();
16595 dwarf2_invalid_attrib_class_complaint ("DW_AT_location",
16596 "common block member");
16601 if (die->child != NULL)
16603 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
16604 struct die_info *child_die;
16605 size_t n_entries = 0, size;
16606 struct common_block *common_block;
16607 struct symbol *sym;
16609 for (child_die = die->child;
16610 child_die && child_die->tag;
16611 child_die = sibling_die (child_die))
16614 size = (sizeof (struct common_block)
16615 + (n_entries - 1) * sizeof (struct symbol *));
16617 = (struct common_block *) obstack_alloc (&objfile->objfile_obstack,
16619 memset (common_block->contents, 0, n_entries * sizeof (struct symbol *));
16620 common_block->n_entries = 0;
16622 for (child_die = die->child;
16623 child_die && child_die->tag;
16624 child_die = sibling_die (child_die))
16626 /* Create the symbol in the DW_TAG_common_block block in the current
16628 sym = new_symbol (child_die, NULL, cu);
16631 struct attribute *member_loc;
16633 common_block->contents[common_block->n_entries++] = sym;
16635 member_loc = dwarf2_attr (child_die, DW_AT_data_member_location,
16639 /* GDB has handled this for a long time, but it is
16640 not specified by DWARF. It seems to have been
16641 emitted by gfortran at least as recently as:
16642 http://gcc.gnu.org/bugzilla/show_bug.cgi?id=23057. */
16643 complaint (_("Variable in common block has "
16644 "DW_AT_data_member_location "
16645 "- DIE at %s [in module %s]"),
16646 sect_offset_str (child_die->sect_off),
16647 objfile_name (objfile));
16649 if (attr_form_is_section_offset (member_loc))
16650 dwarf2_complex_location_expr_complaint ();
16651 else if (attr_form_is_constant (member_loc)
16652 || attr_form_is_block (member_loc))
16655 mark_common_block_symbol_computed (sym, die, attr,
16659 dwarf2_complex_location_expr_complaint ();
16664 sym = new_symbol (die, objfile_type (objfile)->builtin_void, cu);
16665 SYMBOL_VALUE_COMMON_BLOCK (sym) = common_block;
16669 /* Create a type for a C++ namespace. */
16671 static struct type *
16672 read_namespace_type (struct die_info *die, struct dwarf2_cu *cu)
16674 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
16675 const char *previous_prefix, *name;
16679 /* For extensions, reuse the type of the original namespace. */
16680 if (dwarf2_attr (die, DW_AT_extension, cu) != NULL)
16682 struct die_info *ext_die;
16683 struct dwarf2_cu *ext_cu = cu;
16685 ext_die = dwarf2_extension (die, &ext_cu);
16686 type = read_type_die (ext_die, ext_cu);
16688 /* EXT_CU may not be the same as CU.
16689 Ensure TYPE is recorded with CU in die_type_hash. */
16690 return set_die_type (die, type, cu);
16693 name = namespace_name (die, &is_anonymous, cu);
16695 /* Now build the name of the current namespace. */
16697 previous_prefix = determine_prefix (die, cu);
16698 if (previous_prefix[0] != '\0')
16699 name = typename_concat (&objfile->objfile_obstack,
16700 previous_prefix, name, 0, cu);
16702 /* Create the type. */
16703 type = init_type (objfile, TYPE_CODE_NAMESPACE, 0, name);
16705 return set_die_type (die, type, cu);
16708 /* Read a namespace scope. */
16711 read_namespace (struct die_info *die, struct dwarf2_cu *cu)
16713 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
16716 /* Add a symbol associated to this if we haven't seen the namespace
16717 before. Also, add a using directive if it's an anonymous
16720 if (dwarf2_attr (die, DW_AT_extension, cu) == NULL)
16724 type = read_type_die (die, cu);
16725 new_symbol (die, type, cu);
16727 namespace_name (die, &is_anonymous, cu);
16730 const char *previous_prefix = determine_prefix (die, cu);
16732 std::vector<const char *> excludes;
16733 add_using_directive (using_directives (cu),
16734 previous_prefix, TYPE_NAME (type), NULL,
16735 NULL, excludes, 0, &objfile->objfile_obstack);
16739 if (die->child != NULL)
16741 struct die_info *child_die = die->child;
16743 while (child_die && child_die->tag)
16745 process_die (child_die, cu);
16746 child_die = sibling_die (child_die);
16751 /* Read a Fortran module as type. This DIE can be only a declaration used for
16752 imported module. Still we need that type as local Fortran "use ... only"
16753 declaration imports depend on the created type in determine_prefix. */
16755 static struct type *
16756 read_module_type (struct die_info *die, struct dwarf2_cu *cu)
16758 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
16759 const char *module_name;
16762 module_name = dwarf2_name (die, cu);
16764 complaint (_("DW_TAG_module has no name, offset %s"),
16765 sect_offset_str (die->sect_off));
16766 type = init_type (objfile, TYPE_CODE_MODULE, 0, module_name);
16768 return set_die_type (die, type, cu);
16771 /* Read a Fortran module. */
16774 read_module (struct die_info *die, struct dwarf2_cu *cu)
16776 struct die_info *child_die = die->child;
16779 type = read_type_die (die, cu);
16780 new_symbol (die, type, cu);
16782 while (child_die && child_die->tag)
16784 process_die (child_die, cu);
16785 child_die = sibling_die (child_die);
16789 /* Return the name of the namespace represented by DIE. Set
16790 *IS_ANONYMOUS to tell whether or not the namespace is an anonymous
16793 static const char *
16794 namespace_name (struct die_info *die, int *is_anonymous, struct dwarf2_cu *cu)
16796 struct die_info *current_die;
16797 const char *name = NULL;
16799 /* Loop through the extensions until we find a name. */
16801 for (current_die = die;
16802 current_die != NULL;
16803 current_die = dwarf2_extension (die, &cu))
16805 /* We don't use dwarf2_name here so that we can detect the absence
16806 of a name -> anonymous namespace. */
16807 name = dwarf2_string_attr (die, DW_AT_name, cu);
16813 /* Is it an anonymous namespace? */
16815 *is_anonymous = (name == NULL);
16817 name = CP_ANONYMOUS_NAMESPACE_STR;
16822 /* Extract all information from a DW_TAG_pointer_type DIE and add to
16823 the user defined type vector. */
16825 static struct type *
16826 read_tag_pointer_type (struct die_info *die, struct dwarf2_cu *cu)
16828 struct gdbarch *gdbarch
16829 = get_objfile_arch (cu->per_cu->dwarf2_per_objfile->objfile);
16830 struct comp_unit_head *cu_header = &cu->header;
16832 struct attribute *attr_byte_size;
16833 struct attribute *attr_address_class;
16834 int byte_size, addr_class;
16835 struct type *target_type;
16837 target_type = die_type (die, cu);
16839 /* The die_type call above may have already set the type for this DIE. */
16840 type = get_die_type (die, cu);
16844 type = lookup_pointer_type (target_type);
16846 attr_byte_size = dwarf2_attr (die, DW_AT_byte_size, cu);
16847 if (attr_byte_size)
16848 byte_size = DW_UNSND (attr_byte_size);
16850 byte_size = cu_header->addr_size;
16852 attr_address_class = dwarf2_attr (die, DW_AT_address_class, cu);
16853 if (attr_address_class)
16854 addr_class = DW_UNSND (attr_address_class);
16856 addr_class = DW_ADDR_none;
16858 ULONGEST alignment = get_alignment (cu, die);
16860 /* If the pointer size, alignment, or address class is different
16861 than the default, create a type variant marked as such and set
16862 the length accordingly. */
16863 if (TYPE_LENGTH (type) != byte_size
16864 || (alignment != 0 && TYPE_RAW_ALIGN (type) != 0
16865 && alignment != TYPE_RAW_ALIGN (type))
16866 || addr_class != DW_ADDR_none)
16868 if (gdbarch_address_class_type_flags_p (gdbarch))
16872 type_flags = gdbarch_address_class_type_flags
16873 (gdbarch, byte_size, addr_class);
16874 gdb_assert ((type_flags & ~TYPE_INSTANCE_FLAG_ADDRESS_CLASS_ALL)
16876 type = make_type_with_address_space (type, type_flags);
16878 else if (TYPE_LENGTH (type) != byte_size)
16880 complaint (_("invalid pointer size %d"), byte_size);
16882 else if (TYPE_RAW_ALIGN (type) != alignment)
16884 complaint (_("Invalid DW_AT_alignment"
16885 " - DIE at %s [in module %s]"),
16886 sect_offset_str (die->sect_off),
16887 objfile_name (cu->per_cu->dwarf2_per_objfile->objfile));
16891 /* Should we also complain about unhandled address classes? */
16895 TYPE_LENGTH (type) = byte_size;
16896 set_type_align (type, alignment);
16897 return set_die_type (die, type, cu);
16900 /* Extract all information from a DW_TAG_ptr_to_member_type DIE and add to
16901 the user defined type vector. */
16903 static struct type *
16904 read_tag_ptr_to_member_type (struct die_info *die, struct dwarf2_cu *cu)
16907 struct type *to_type;
16908 struct type *domain;
16910 to_type = die_type (die, cu);
16911 domain = die_containing_type (die, cu);
16913 /* The calls above may have already set the type for this DIE. */
16914 type = get_die_type (die, cu);
16918 if (TYPE_CODE (check_typedef (to_type)) == TYPE_CODE_METHOD)
16919 type = lookup_methodptr_type (to_type);
16920 else if (TYPE_CODE (check_typedef (to_type)) == TYPE_CODE_FUNC)
16922 struct type *new_type
16923 = alloc_type (cu->per_cu->dwarf2_per_objfile->objfile);
16925 smash_to_method_type (new_type, domain, TYPE_TARGET_TYPE (to_type),
16926 TYPE_FIELDS (to_type), TYPE_NFIELDS (to_type),
16927 TYPE_VARARGS (to_type));
16928 type = lookup_methodptr_type (new_type);
16931 type = lookup_memberptr_type (to_type, domain);
16933 return set_die_type (die, type, cu);
16936 /* Extract all information from a DW_TAG_{rvalue_,}reference_type DIE and add to
16937 the user defined type vector. */
16939 static struct type *
16940 read_tag_reference_type (struct die_info *die, struct dwarf2_cu *cu,
16941 enum type_code refcode)
16943 struct comp_unit_head *cu_header = &cu->header;
16944 struct type *type, *target_type;
16945 struct attribute *attr;
16947 gdb_assert (refcode == TYPE_CODE_REF || refcode == TYPE_CODE_RVALUE_REF);
16949 target_type = die_type (die, cu);
16951 /* The die_type call above may have already set the type for this DIE. */
16952 type = get_die_type (die, cu);
16956 type = lookup_reference_type (target_type, refcode);
16957 attr = dwarf2_attr (die, DW_AT_byte_size, cu);
16960 TYPE_LENGTH (type) = DW_UNSND (attr);
16964 TYPE_LENGTH (type) = cu_header->addr_size;
16966 maybe_set_alignment (cu, die, type);
16967 return set_die_type (die, type, cu);
16970 /* Add the given cv-qualifiers to the element type of the array. GCC
16971 outputs DWARF type qualifiers that apply to an array, not the
16972 element type. But GDB relies on the array element type to carry
16973 the cv-qualifiers. This mimics section 6.7.3 of the C99
16976 static struct type *
16977 add_array_cv_type (struct die_info *die, struct dwarf2_cu *cu,
16978 struct type *base_type, int cnst, int voltl)
16980 struct type *el_type, *inner_array;
16982 base_type = copy_type (base_type);
16983 inner_array = base_type;
16985 while (TYPE_CODE (TYPE_TARGET_TYPE (inner_array)) == TYPE_CODE_ARRAY)
16987 TYPE_TARGET_TYPE (inner_array) =
16988 copy_type (TYPE_TARGET_TYPE (inner_array));
16989 inner_array = TYPE_TARGET_TYPE (inner_array);
16992 el_type = TYPE_TARGET_TYPE (inner_array);
16993 cnst |= TYPE_CONST (el_type);
16994 voltl |= TYPE_VOLATILE (el_type);
16995 TYPE_TARGET_TYPE (inner_array) = make_cv_type (cnst, voltl, el_type, NULL);
16997 return set_die_type (die, base_type, cu);
17000 static struct type *
17001 read_tag_const_type (struct die_info *die, struct dwarf2_cu *cu)
17003 struct type *base_type, *cv_type;
17005 base_type = die_type (die, cu);
17007 /* The die_type call above may have already set the type for this DIE. */
17008 cv_type = get_die_type (die, cu);
17012 /* In case the const qualifier is applied to an array type, the element type
17013 is so qualified, not the array type (section 6.7.3 of C99). */
17014 if (TYPE_CODE (base_type) == TYPE_CODE_ARRAY)
17015 return add_array_cv_type (die, cu, base_type, 1, 0);
17017 cv_type = make_cv_type (1, TYPE_VOLATILE (base_type), base_type, 0);
17018 return set_die_type (die, cv_type, cu);
17021 static struct type *
17022 read_tag_volatile_type (struct die_info *die, struct dwarf2_cu *cu)
17024 struct type *base_type, *cv_type;
17026 base_type = die_type (die, cu);
17028 /* The die_type call above may have already set the type for this DIE. */
17029 cv_type = get_die_type (die, cu);
17033 /* In case the volatile qualifier is applied to an array type, the
17034 element type is so qualified, not the array type (section 6.7.3
17036 if (TYPE_CODE (base_type) == TYPE_CODE_ARRAY)
17037 return add_array_cv_type (die, cu, base_type, 0, 1);
17039 cv_type = make_cv_type (TYPE_CONST (base_type), 1, base_type, 0);
17040 return set_die_type (die, cv_type, cu);
17043 /* Handle DW_TAG_restrict_type. */
17045 static struct type *
17046 read_tag_restrict_type (struct die_info *die, struct dwarf2_cu *cu)
17048 struct type *base_type, *cv_type;
17050 base_type = die_type (die, cu);
17052 /* The die_type call above may have already set the type for this DIE. */
17053 cv_type = get_die_type (die, cu);
17057 cv_type = make_restrict_type (base_type);
17058 return set_die_type (die, cv_type, cu);
17061 /* Handle DW_TAG_atomic_type. */
17063 static struct type *
17064 read_tag_atomic_type (struct die_info *die, struct dwarf2_cu *cu)
17066 struct type *base_type, *cv_type;
17068 base_type = die_type (die, cu);
17070 /* The die_type call above may have already set the type for this DIE. */
17071 cv_type = get_die_type (die, cu);
17075 cv_type = make_atomic_type (base_type);
17076 return set_die_type (die, cv_type, cu);
17079 /* Extract all information from a DW_TAG_string_type DIE and add to
17080 the user defined type vector. It isn't really a user defined type,
17081 but it behaves like one, with other DIE's using an AT_user_def_type
17082 attribute to reference it. */
17084 static struct type *
17085 read_tag_string_type (struct die_info *die, struct dwarf2_cu *cu)
17087 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
17088 struct gdbarch *gdbarch = get_objfile_arch (objfile);
17089 struct type *type, *range_type, *index_type, *char_type;
17090 struct attribute *attr;
17091 unsigned int length;
17093 attr = dwarf2_attr (die, DW_AT_string_length, cu);
17096 length = DW_UNSND (attr);
17100 /* Check for the DW_AT_byte_size attribute. */
17101 attr = dwarf2_attr (die, DW_AT_byte_size, cu);
17104 length = DW_UNSND (attr);
17112 index_type = objfile_type (objfile)->builtin_int;
17113 range_type = create_static_range_type (NULL, index_type, 1, length);
17114 char_type = language_string_char_type (cu->language_defn, gdbarch);
17115 type = create_string_type (NULL, char_type, range_type);
17117 return set_die_type (die, type, cu);
17120 /* Assuming that DIE corresponds to a function, returns nonzero
17121 if the function is prototyped. */
17124 prototyped_function_p (struct die_info *die, struct dwarf2_cu *cu)
17126 struct attribute *attr;
17128 attr = dwarf2_attr (die, DW_AT_prototyped, cu);
17129 if (attr && (DW_UNSND (attr) != 0))
17132 /* The DWARF standard implies that the DW_AT_prototyped attribute
17133 is only meaninful for C, but the concept also extends to other
17134 languages that allow unprototyped functions (Eg: Objective C).
17135 For all other languages, assume that functions are always
17137 if (cu->language != language_c
17138 && cu->language != language_objc
17139 && cu->language != language_opencl)
17142 /* RealView does not emit DW_AT_prototyped. We can not distinguish
17143 prototyped and unprototyped functions; default to prototyped,
17144 since that is more common in modern code (and RealView warns
17145 about unprototyped functions). */
17146 if (producer_is_realview (cu->producer))
17152 /* Handle DIES due to C code like:
17156 int (*funcp)(int a, long l);
17160 ('funcp' generates a DW_TAG_subroutine_type DIE). */
17162 static struct type *
17163 read_subroutine_type (struct die_info *die, struct dwarf2_cu *cu)
17165 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
17166 struct type *type; /* Type that this function returns. */
17167 struct type *ftype; /* Function that returns above type. */
17168 struct attribute *attr;
17170 type = die_type (die, cu);
17172 /* The die_type call above may have already set the type for this DIE. */
17173 ftype = get_die_type (die, cu);
17177 ftype = lookup_function_type (type);
17179 if (prototyped_function_p (die, cu))
17180 TYPE_PROTOTYPED (ftype) = 1;
17182 /* Store the calling convention in the type if it's available in
17183 the subroutine die. Otherwise set the calling convention to
17184 the default value DW_CC_normal. */
17185 attr = dwarf2_attr (die, DW_AT_calling_convention, cu);
17187 TYPE_CALLING_CONVENTION (ftype) = DW_UNSND (attr);
17188 else if (cu->producer && strstr (cu->producer, "IBM XL C for OpenCL"))
17189 TYPE_CALLING_CONVENTION (ftype) = DW_CC_GDB_IBM_OpenCL;
17191 TYPE_CALLING_CONVENTION (ftype) = DW_CC_normal;
17193 /* Record whether the function returns normally to its caller or not
17194 if the DWARF producer set that information. */
17195 attr = dwarf2_attr (die, DW_AT_noreturn, cu);
17196 if (attr && (DW_UNSND (attr) != 0))
17197 TYPE_NO_RETURN (ftype) = 1;
17199 /* We need to add the subroutine type to the die immediately so
17200 we don't infinitely recurse when dealing with parameters
17201 declared as the same subroutine type. */
17202 set_die_type (die, ftype, cu);
17204 if (die->child != NULL)
17206 struct type *void_type = objfile_type (objfile)->builtin_void;
17207 struct die_info *child_die;
17208 int nparams, iparams;
17210 /* Count the number of parameters.
17211 FIXME: GDB currently ignores vararg functions, but knows about
17212 vararg member functions. */
17214 child_die = die->child;
17215 while (child_die && child_die->tag)
17217 if (child_die->tag == DW_TAG_formal_parameter)
17219 else if (child_die->tag == DW_TAG_unspecified_parameters)
17220 TYPE_VARARGS (ftype) = 1;
17221 child_die = sibling_die (child_die);
17224 /* Allocate storage for parameters and fill them in. */
17225 TYPE_NFIELDS (ftype) = nparams;
17226 TYPE_FIELDS (ftype) = (struct field *)
17227 TYPE_ZALLOC (ftype, nparams * sizeof (struct field));
17229 /* TYPE_FIELD_TYPE must never be NULL. Pre-fill the array to ensure it
17230 even if we error out during the parameters reading below. */
17231 for (iparams = 0; iparams < nparams; iparams++)
17232 TYPE_FIELD_TYPE (ftype, iparams) = void_type;
17235 child_die = die->child;
17236 while (child_die && child_die->tag)
17238 if (child_die->tag == DW_TAG_formal_parameter)
17240 struct type *arg_type;
17242 /* DWARF version 2 has no clean way to discern C++
17243 static and non-static member functions. G++ helps
17244 GDB by marking the first parameter for non-static
17245 member functions (which is the this pointer) as
17246 artificial. We pass this information to
17247 dwarf2_add_member_fn via TYPE_FIELD_ARTIFICIAL.
17249 DWARF version 3 added DW_AT_object_pointer, which GCC
17250 4.5 does not yet generate. */
17251 attr = dwarf2_attr (child_die, DW_AT_artificial, cu);
17253 TYPE_FIELD_ARTIFICIAL (ftype, iparams) = DW_UNSND (attr);
17255 TYPE_FIELD_ARTIFICIAL (ftype, iparams) = 0;
17256 arg_type = die_type (child_die, cu);
17258 /* RealView does not mark THIS as const, which the testsuite
17259 expects. GCC marks THIS as const in method definitions,
17260 but not in the class specifications (GCC PR 43053). */
17261 if (cu->language == language_cplus && !TYPE_CONST (arg_type)
17262 && TYPE_FIELD_ARTIFICIAL (ftype, iparams))
17265 struct dwarf2_cu *arg_cu = cu;
17266 const char *name = dwarf2_name (child_die, cu);
17268 attr = dwarf2_attr (die, DW_AT_object_pointer, cu);
17271 /* If the compiler emits this, use it. */
17272 if (follow_die_ref (die, attr, &arg_cu) == child_die)
17275 else if (name && strcmp (name, "this") == 0)
17276 /* Function definitions will have the argument names. */
17278 else if (name == NULL && iparams == 0)
17279 /* Declarations may not have the names, so like
17280 elsewhere in GDB, assume an artificial first
17281 argument is "this". */
17285 arg_type = make_cv_type (1, TYPE_VOLATILE (arg_type),
17289 TYPE_FIELD_TYPE (ftype, iparams) = arg_type;
17292 child_die = sibling_die (child_die);
17299 static struct type *
17300 read_typedef (struct die_info *die, struct dwarf2_cu *cu)
17302 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
17303 const char *name = NULL;
17304 struct type *this_type, *target_type;
17306 name = dwarf2_full_name (NULL, die, cu);
17307 this_type = init_type (objfile, TYPE_CODE_TYPEDEF, 0, name);
17308 TYPE_TARGET_STUB (this_type) = 1;
17309 set_die_type (die, this_type, cu);
17310 target_type = die_type (die, cu);
17311 if (target_type != this_type)
17312 TYPE_TARGET_TYPE (this_type) = target_type;
17315 /* Self-referential typedefs are, it seems, not allowed by the DWARF
17316 spec and cause infinite loops in GDB. */
17317 complaint (_("Self-referential DW_TAG_typedef "
17318 "- DIE at %s [in module %s]"),
17319 sect_offset_str (die->sect_off), objfile_name (objfile));
17320 TYPE_TARGET_TYPE (this_type) = NULL;
17325 /* Allocate a floating-point type of size BITS and name NAME. Pass NAME_HINT
17326 (which may be different from NAME) to the architecture back-end to allow
17327 it to guess the correct format if necessary. */
17329 static struct type *
17330 dwarf2_init_float_type (struct objfile *objfile, int bits, const char *name,
17331 const char *name_hint)
17333 struct gdbarch *gdbarch = get_objfile_arch (objfile);
17334 const struct floatformat **format;
17337 format = gdbarch_floatformat_for_type (gdbarch, name_hint, bits);
17339 type = init_float_type (objfile, bits, name, format);
17341 type = init_type (objfile, TYPE_CODE_ERROR, bits, name);
17346 /* Find a representation of a given base type and install
17347 it in the TYPE field of the die. */
17349 static struct type *
17350 read_base_type (struct die_info *die, struct dwarf2_cu *cu)
17352 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
17354 struct attribute *attr;
17355 int encoding = 0, bits = 0;
17358 attr = dwarf2_attr (die, DW_AT_encoding, cu);
17361 encoding = DW_UNSND (attr);
17363 attr = dwarf2_attr (die, DW_AT_byte_size, cu);
17366 bits = DW_UNSND (attr) * TARGET_CHAR_BIT;
17368 name = dwarf2_name (die, cu);
17371 complaint (_("DW_AT_name missing from DW_TAG_base_type"));
17376 case DW_ATE_address:
17377 /* Turn DW_ATE_address into a void * pointer. */
17378 type = init_type (objfile, TYPE_CODE_VOID, TARGET_CHAR_BIT, NULL);
17379 type = init_pointer_type (objfile, bits, name, type);
17381 case DW_ATE_boolean:
17382 type = init_boolean_type (objfile, bits, 1, name);
17384 case DW_ATE_complex_float:
17385 type = dwarf2_init_float_type (objfile, bits / 2, NULL, name);
17386 type = init_complex_type (objfile, name, type);
17388 case DW_ATE_decimal_float:
17389 type = init_decfloat_type (objfile, bits, name);
17392 type = dwarf2_init_float_type (objfile, bits, name, name);
17394 case DW_ATE_signed:
17395 type = init_integer_type (objfile, bits, 0, name);
17397 case DW_ATE_unsigned:
17398 if (cu->language == language_fortran
17400 && startswith (name, "character("))
17401 type = init_character_type (objfile, bits, 1, name);
17403 type = init_integer_type (objfile, bits, 1, name);
17405 case DW_ATE_signed_char:
17406 if (cu->language == language_ada || cu->language == language_m2
17407 || cu->language == language_pascal
17408 || cu->language == language_fortran)
17409 type = init_character_type (objfile, bits, 0, name);
17411 type = init_integer_type (objfile, bits, 0, name);
17413 case DW_ATE_unsigned_char:
17414 if (cu->language == language_ada || cu->language == language_m2
17415 || cu->language == language_pascal
17416 || cu->language == language_fortran
17417 || cu->language == language_rust)
17418 type = init_character_type (objfile, bits, 1, name);
17420 type = init_integer_type (objfile, bits, 1, name);
17424 gdbarch *arch = get_objfile_arch (objfile);
17427 type = builtin_type (arch)->builtin_char16;
17428 else if (bits == 32)
17429 type = builtin_type (arch)->builtin_char32;
17432 complaint (_("unsupported DW_ATE_UTF bit size: '%d'"),
17434 type = init_integer_type (objfile, bits, 1, name);
17436 return set_die_type (die, type, cu);
17441 complaint (_("unsupported DW_AT_encoding: '%s'"),
17442 dwarf_type_encoding_name (encoding));
17443 type = init_type (objfile, TYPE_CODE_ERROR, bits, name);
17447 if (name && strcmp (name, "char") == 0)
17448 TYPE_NOSIGN (type) = 1;
17450 maybe_set_alignment (cu, die, type);
17452 return set_die_type (die, type, cu);
17455 /* Parse dwarf attribute if it's a block, reference or constant and put the
17456 resulting value of the attribute into struct bound_prop.
17457 Returns 1 if ATTR could be resolved into PROP, 0 otherwise. */
17460 attr_to_dynamic_prop (const struct attribute *attr, struct die_info *die,
17461 struct dwarf2_cu *cu, struct dynamic_prop *prop)
17463 struct dwarf2_property_baton *baton;
17464 struct obstack *obstack
17465 = &cu->per_cu->dwarf2_per_objfile->objfile->objfile_obstack;
17467 if (attr == NULL || prop == NULL)
17470 if (attr_form_is_block (attr))
17472 baton = XOBNEW (obstack, struct dwarf2_property_baton);
17473 baton->referenced_type = NULL;
17474 baton->locexpr.per_cu = cu->per_cu;
17475 baton->locexpr.size = DW_BLOCK (attr)->size;
17476 baton->locexpr.data = DW_BLOCK (attr)->data;
17477 prop->data.baton = baton;
17478 prop->kind = PROP_LOCEXPR;
17479 gdb_assert (prop->data.baton != NULL);
17481 else if (attr_form_is_ref (attr))
17483 struct dwarf2_cu *target_cu = cu;
17484 struct die_info *target_die;
17485 struct attribute *target_attr;
17487 target_die = follow_die_ref (die, attr, &target_cu);
17488 target_attr = dwarf2_attr (target_die, DW_AT_location, target_cu);
17489 if (target_attr == NULL)
17490 target_attr = dwarf2_attr (target_die, DW_AT_data_member_location,
17492 if (target_attr == NULL)
17495 switch (target_attr->name)
17497 case DW_AT_location:
17498 if (attr_form_is_section_offset (target_attr))
17500 baton = XOBNEW (obstack, struct dwarf2_property_baton);
17501 baton->referenced_type = die_type (target_die, target_cu);
17502 fill_in_loclist_baton (cu, &baton->loclist, target_attr);
17503 prop->data.baton = baton;
17504 prop->kind = PROP_LOCLIST;
17505 gdb_assert (prop->data.baton != NULL);
17507 else if (attr_form_is_block (target_attr))
17509 baton = XOBNEW (obstack, struct dwarf2_property_baton);
17510 baton->referenced_type = die_type (target_die, target_cu);
17511 baton->locexpr.per_cu = cu->per_cu;
17512 baton->locexpr.size = DW_BLOCK (target_attr)->size;
17513 baton->locexpr.data = DW_BLOCK (target_attr)->data;
17514 prop->data.baton = baton;
17515 prop->kind = PROP_LOCEXPR;
17516 gdb_assert (prop->data.baton != NULL);
17520 dwarf2_invalid_attrib_class_complaint ("DW_AT_location",
17521 "dynamic property");
17525 case DW_AT_data_member_location:
17529 if (!handle_data_member_location (target_die, target_cu,
17533 baton = XOBNEW (obstack, struct dwarf2_property_baton);
17534 baton->referenced_type = read_type_die (target_die->parent,
17536 baton->offset_info.offset = offset;
17537 baton->offset_info.type = die_type (target_die, target_cu);
17538 prop->data.baton = baton;
17539 prop->kind = PROP_ADDR_OFFSET;
17544 else if (attr_form_is_constant (attr))
17546 prop->data.const_val = dwarf2_get_attr_constant_value (attr, 0);
17547 prop->kind = PROP_CONST;
17551 dwarf2_invalid_attrib_class_complaint (dwarf_form_name (attr->form),
17552 dwarf2_name (die, cu));
17559 /* Read the given DW_AT_subrange DIE. */
17561 static struct type *
17562 read_subrange_type (struct die_info *die, struct dwarf2_cu *cu)
17564 struct type *base_type, *orig_base_type;
17565 struct type *range_type;
17566 struct attribute *attr;
17567 struct dynamic_prop low, high;
17568 int low_default_is_valid;
17569 int high_bound_is_count = 0;
17571 LONGEST negative_mask;
17573 orig_base_type = die_type (die, cu);
17574 /* If ORIG_BASE_TYPE is a typedef, it will not be TYPE_UNSIGNED,
17575 whereas the real type might be. So, we use ORIG_BASE_TYPE when
17576 creating the range type, but we use the result of check_typedef
17577 when examining properties of the type. */
17578 base_type = check_typedef (orig_base_type);
17580 /* The die_type call above may have already set the type for this DIE. */
17581 range_type = get_die_type (die, cu);
17585 low.kind = PROP_CONST;
17586 high.kind = PROP_CONST;
17587 high.data.const_val = 0;
17589 /* Set LOW_DEFAULT_IS_VALID if current language and DWARF version allow
17590 omitting DW_AT_lower_bound. */
17591 switch (cu->language)
17594 case language_cplus:
17595 low.data.const_val = 0;
17596 low_default_is_valid = 1;
17598 case language_fortran:
17599 low.data.const_val = 1;
17600 low_default_is_valid = 1;
17603 case language_objc:
17604 case language_rust:
17605 low.data.const_val = 0;
17606 low_default_is_valid = (cu->header.version >= 4);
17610 case language_pascal:
17611 low.data.const_val = 1;
17612 low_default_is_valid = (cu->header.version >= 4);
17615 low.data.const_val = 0;
17616 low_default_is_valid = 0;
17620 attr = dwarf2_attr (die, DW_AT_lower_bound, cu);
17622 attr_to_dynamic_prop (attr, die, cu, &low);
17623 else if (!low_default_is_valid)
17624 complaint (_("Missing DW_AT_lower_bound "
17625 "- DIE at %s [in module %s]"),
17626 sect_offset_str (die->sect_off),
17627 objfile_name (cu->per_cu->dwarf2_per_objfile->objfile));
17629 attr = dwarf2_attr (die, DW_AT_upper_bound, cu);
17630 if (!attr_to_dynamic_prop (attr, die, cu, &high))
17632 attr = dwarf2_attr (die, DW_AT_count, cu);
17633 if (attr_to_dynamic_prop (attr, die, cu, &high))
17635 /* If bounds are constant do the final calculation here. */
17636 if (low.kind == PROP_CONST && high.kind == PROP_CONST)
17637 high.data.const_val = low.data.const_val + high.data.const_val - 1;
17639 high_bound_is_count = 1;
17643 /* Dwarf-2 specifications explicitly allows to create subrange types
17644 without specifying a base type.
17645 In that case, the base type must be set to the type of
17646 the lower bound, upper bound or count, in that order, if any of these
17647 three attributes references an object that has a type.
17648 If no base type is found, the Dwarf-2 specifications say that
17649 a signed integer type of size equal to the size of an address should
17651 For the following C code: `extern char gdb_int [];'
17652 GCC produces an empty range DIE.
17653 FIXME: muller/2010-05-28: Possible references to object for low bound,
17654 high bound or count are not yet handled by this code. */
17655 if (TYPE_CODE (base_type) == TYPE_CODE_VOID)
17657 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
17658 struct gdbarch *gdbarch = get_objfile_arch (objfile);
17659 int addr_size = gdbarch_addr_bit (gdbarch) /8;
17660 struct type *int_type = objfile_type (objfile)->builtin_int;
17662 /* Test "int", "long int", and "long long int" objfile types,
17663 and select the first one having a size above or equal to the
17664 architecture address size. */
17665 if (int_type && TYPE_LENGTH (int_type) >= addr_size)
17666 base_type = int_type;
17669 int_type = objfile_type (objfile)->builtin_long;
17670 if (int_type && TYPE_LENGTH (int_type) >= addr_size)
17671 base_type = int_type;
17674 int_type = objfile_type (objfile)->builtin_long_long;
17675 if (int_type && TYPE_LENGTH (int_type) >= addr_size)
17676 base_type = int_type;
17681 /* Normally, the DWARF producers are expected to use a signed
17682 constant form (Eg. DW_FORM_sdata) to express negative bounds.
17683 But this is unfortunately not always the case, as witnessed
17684 with GCC, for instance, where the ambiguous DW_FORM_dataN form
17685 is used instead. To work around that ambiguity, we treat
17686 the bounds as signed, and thus sign-extend their values, when
17687 the base type is signed. */
17689 -((LONGEST) 1 << (TYPE_LENGTH (base_type) * TARGET_CHAR_BIT - 1));
17690 if (low.kind == PROP_CONST
17691 && !TYPE_UNSIGNED (base_type) && (low.data.const_val & negative_mask))
17692 low.data.const_val |= negative_mask;
17693 if (high.kind == PROP_CONST
17694 && !TYPE_UNSIGNED (base_type) && (high.data.const_val & negative_mask))
17695 high.data.const_val |= negative_mask;
17697 range_type = create_range_type (NULL, orig_base_type, &low, &high);
17699 if (high_bound_is_count)
17700 TYPE_RANGE_DATA (range_type)->flag_upper_bound_is_count = 1;
17702 /* Ada expects an empty array on no boundary attributes. */
17703 if (attr == NULL && cu->language != language_ada)
17704 TYPE_HIGH_BOUND_KIND (range_type) = PROP_UNDEFINED;
17706 name = dwarf2_name (die, cu);
17708 TYPE_NAME (range_type) = name;
17710 attr = dwarf2_attr (die, DW_AT_byte_size, cu);
17712 TYPE_LENGTH (range_type) = DW_UNSND (attr);
17714 maybe_set_alignment (cu, die, range_type);
17716 set_die_type (die, range_type, cu);
17718 /* set_die_type should be already done. */
17719 set_descriptive_type (range_type, die, cu);
17724 static struct type *
17725 read_unspecified_type (struct die_info *die, struct dwarf2_cu *cu)
17729 type = init_type (cu->per_cu->dwarf2_per_objfile->objfile, TYPE_CODE_VOID,0,
17731 TYPE_NAME (type) = dwarf2_name (die, cu);
17733 /* In Ada, an unspecified type is typically used when the description
17734 of the type is defered to a different unit. When encountering
17735 such a type, we treat it as a stub, and try to resolve it later on,
17737 if (cu->language == language_ada)
17738 TYPE_STUB (type) = 1;
17740 return set_die_type (die, type, cu);
17743 /* Read a single die and all its descendents. Set the die's sibling
17744 field to NULL; set other fields in the die correctly, and set all
17745 of the descendents' fields correctly. Set *NEW_INFO_PTR to the
17746 location of the info_ptr after reading all of those dies. PARENT
17747 is the parent of the die in question. */
17749 static struct die_info *
17750 read_die_and_children (const struct die_reader_specs *reader,
17751 const gdb_byte *info_ptr,
17752 const gdb_byte **new_info_ptr,
17753 struct die_info *parent)
17755 struct die_info *die;
17756 const gdb_byte *cur_ptr;
17759 cur_ptr = read_full_die_1 (reader, &die, info_ptr, &has_children, 0);
17762 *new_info_ptr = cur_ptr;
17765 store_in_ref_table (die, reader->cu);
17768 die->child = read_die_and_siblings_1 (reader, cur_ptr, new_info_ptr, die);
17772 *new_info_ptr = cur_ptr;
17775 die->sibling = NULL;
17776 die->parent = parent;
17780 /* Read a die, all of its descendents, and all of its siblings; set
17781 all of the fields of all of the dies correctly. Arguments are as
17782 in read_die_and_children. */
17784 static struct die_info *
17785 read_die_and_siblings_1 (const struct die_reader_specs *reader,
17786 const gdb_byte *info_ptr,
17787 const gdb_byte **new_info_ptr,
17788 struct die_info *parent)
17790 struct die_info *first_die, *last_sibling;
17791 const gdb_byte *cur_ptr;
17793 cur_ptr = info_ptr;
17794 first_die = last_sibling = NULL;
17798 struct die_info *die
17799 = read_die_and_children (reader, cur_ptr, &cur_ptr, parent);
17803 *new_info_ptr = cur_ptr;
17810 last_sibling->sibling = die;
17812 last_sibling = die;
17816 /* Read a die, all of its descendents, and all of its siblings; set
17817 all of the fields of all of the dies correctly. Arguments are as
17818 in read_die_and_children.
17819 This the main entry point for reading a DIE and all its children. */
17821 static struct die_info *
17822 read_die_and_siblings (const struct die_reader_specs *reader,
17823 const gdb_byte *info_ptr,
17824 const gdb_byte **new_info_ptr,
17825 struct die_info *parent)
17827 struct die_info *die = read_die_and_siblings_1 (reader, info_ptr,
17828 new_info_ptr, parent);
17830 if (dwarf_die_debug)
17832 fprintf_unfiltered (gdb_stdlog,
17833 "Read die from %s@0x%x of %s:\n",
17834 get_section_name (reader->die_section),
17835 (unsigned) (info_ptr - reader->die_section->buffer),
17836 bfd_get_filename (reader->abfd));
17837 dump_die (die, dwarf_die_debug);
17843 /* Read a die and all its attributes, leave space for NUM_EXTRA_ATTRS
17845 The caller is responsible for filling in the extra attributes
17846 and updating (*DIEP)->num_attrs.
17847 Set DIEP to point to a newly allocated die with its information,
17848 except for its child, sibling, and parent fields.
17849 Set HAS_CHILDREN to tell whether the die has children or not. */
17851 static const gdb_byte *
17852 read_full_die_1 (const struct die_reader_specs *reader,
17853 struct die_info **diep, const gdb_byte *info_ptr,
17854 int *has_children, int num_extra_attrs)
17856 unsigned int abbrev_number, bytes_read, i;
17857 struct abbrev_info *abbrev;
17858 struct die_info *die;
17859 struct dwarf2_cu *cu = reader->cu;
17860 bfd *abfd = reader->abfd;
17862 sect_offset sect_off = (sect_offset) (info_ptr - reader->buffer);
17863 abbrev_number = read_unsigned_leb128 (abfd, info_ptr, &bytes_read);
17864 info_ptr += bytes_read;
17865 if (!abbrev_number)
17872 abbrev = reader->abbrev_table->lookup_abbrev (abbrev_number);
17874 error (_("Dwarf Error: could not find abbrev number %d [in module %s]"),
17876 bfd_get_filename (abfd));
17878 die = dwarf_alloc_die (cu, abbrev->num_attrs + num_extra_attrs);
17879 die->sect_off = sect_off;
17880 die->tag = abbrev->tag;
17881 die->abbrev = abbrev_number;
17883 /* Make the result usable.
17884 The caller needs to update num_attrs after adding the extra
17886 die->num_attrs = abbrev->num_attrs;
17888 for (i = 0; i < abbrev->num_attrs; ++i)
17889 info_ptr = read_attribute (reader, &die->attrs[i], &abbrev->attrs[i],
17893 *has_children = abbrev->has_children;
17897 /* Read a die and all its attributes.
17898 Set DIEP to point to a newly allocated die with its information,
17899 except for its child, sibling, and parent fields.
17900 Set HAS_CHILDREN to tell whether the die has children or not. */
17902 static const gdb_byte *
17903 read_full_die (const struct die_reader_specs *reader,
17904 struct die_info **diep, const gdb_byte *info_ptr,
17907 const gdb_byte *result;
17909 result = read_full_die_1 (reader, diep, info_ptr, has_children, 0);
17911 if (dwarf_die_debug)
17913 fprintf_unfiltered (gdb_stdlog,
17914 "Read die from %s@0x%x of %s:\n",
17915 get_section_name (reader->die_section),
17916 (unsigned) (info_ptr - reader->die_section->buffer),
17917 bfd_get_filename (reader->abfd));
17918 dump_die (*diep, dwarf_die_debug);
17924 /* Abbreviation tables.
17926 In DWARF version 2, the description of the debugging information is
17927 stored in a separate .debug_abbrev section. Before we read any
17928 dies from a section we read in all abbreviations and install them
17929 in a hash table. */
17931 /* Allocate space for a struct abbrev_info object in ABBREV_TABLE. */
17933 struct abbrev_info *
17934 abbrev_table::alloc_abbrev ()
17936 struct abbrev_info *abbrev;
17938 abbrev = XOBNEW (&abbrev_obstack, struct abbrev_info);
17939 memset (abbrev, 0, sizeof (struct abbrev_info));
17944 /* Add an abbreviation to the table. */
17947 abbrev_table::add_abbrev (unsigned int abbrev_number,
17948 struct abbrev_info *abbrev)
17950 unsigned int hash_number;
17952 hash_number = abbrev_number % ABBREV_HASH_SIZE;
17953 abbrev->next = m_abbrevs[hash_number];
17954 m_abbrevs[hash_number] = abbrev;
17957 /* Look up an abbrev in the table.
17958 Returns NULL if the abbrev is not found. */
17960 struct abbrev_info *
17961 abbrev_table::lookup_abbrev (unsigned int abbrev_number)
17963 unsigned int hash_number;
17964 struct abbrev_info *abbrev;
17966 hash_number = abbrev_number % ABBREV_HASH_SIZE;
17967 abbrev = m_abbrevs[hash_number];
17971 if (abbrev->number == abbrev_number)
17973 abbrev = abbrev->next;
17978 /* Read in an abbrev table. */
17980 static abbrev_table_up
17981 abbrev_table_read_table (struct dwarf2_per_objfile *dwarf2_per_objfile,
17982 struct dwarf2_section_info *section,
17983 sect_offset sect_off)
17985 struct objfile *objfile = dwarf2_per_objfile->objfile;
17986 bfd *abfd = get_section_bfd_owner (section);
17987 const gdb_byte *abbrev_ptr;
17988 struct abbrev_info *cur_abbrev;
17989 unsigned int abbrev_number, bytes_read, abbrev_name;
17990 unsigned int abbrev_form;
17991 struct attr_abbrev *cur_attrs;
17992 unsigned int allocated_attrs;
17994 abbrev_table_up abbrev_table (new struct abbrev_table (sect_off));
17996 dwarf2_read_section (objfile, section);
17997 abbrev_ptr = section->buffer + to_underlying (sect_off);
17998 abbrev_number = read_unsigned_leb128 (abfd, abbrev_ptr, &bytes_read);
17999 abbrev_ptr += bytes_read;
18001 allocated_attrs = ATTR_ALLOC_CHUNK;
18002 cur_attrs = XNEWVEC (struct attr_abbrev, allocated_attrs);
18004 /* Loop until we reach an abbrev number of 0. */
18005 while (abbrev_number)
18007 cur_abbrev = abbrev_table->alloc_abbrev ();
18009 /* read in abbrev header */
18010 cur_abbrev->number = abbrev_number;
18012 = (enum dwarf_tag) read_unsigned_leb128 (abfd, abbrev_ptr, &bytes_read);
18013 abbrev_ptr += bytes_read;
18014 cur_abbrev->has_children = read_1_byte (abfd, abbrev_ptr);
18017 /* now read in declarations */
18020 LONGEST implicit_const;
18022 abbrev_name = read_unsigned_leb128 (abfd, abbrev_ptr, &bytes_read);
18023 abbrev_ptr += bytes_read;
18024 abbrev_form = read_unsigned_leb128 (abfd, abbrev_ptr, &bytes_read);
18025 abbrev_ptr += bytes_read;
18026 if (abbrev_form == DW_FORM_implicit_const)
18028 implicit_const = read_signed_leb128 (abfd, abbrev_ptr,
18030 abbrev_ptr += bytes_read;
18034 /* Initialize it due to a false compiler warning. */
18035 implicit_const = -1;
18038 if (abbrev_name == 0)
18041 if (cur_abbrev->num_attrs == allocated_attrs)
18043 allocated_attrs += ATTR_ALLOC_CHUNK;
18045 = XRESIZEVEC (struct attr_abbrev, cur_attrs, allocated_attrs);
18048 cur_attrs[cur_abbrev->num_attrs].name
18049 = (enum dwarf_attribute) abbrev_name;
18050 cur_attrs[cur_abbrev->num_attrs].form
18051 = (enum dwarf_form) abbrev_form;
18052 cur_attrs[cur_abbrev->num_attrs].implicit_const = implicit_const;
18053 ++cur_abbrev->num_attrs;
18056 cur_abbrev->attrs =
18057 XOBNEWVEC (&abbrev_table->abbrev_obstack, struct attr_abbrev,
18058 cur_abbrev->num_attrs);
18059 memcpy (cur_abbrev->attrs, cur_attrs,
18060 cur_abbrev->num_attrs * sizeof (struct attr_abbrev));
18062 abbrev_table->add_abbrev (abbrev_number, cur_abbrev);
18064 /* Get next abbreviation.
18065 Under Irix6 the abbreviations for a compilation unit are not
18066 always properly terminated with an abbrev number of 0.
18067 Exit loop if we encounter an abbreviation which we have
18068 already read (which means we are about to read the abbreviations
18069 for the next compile unit) or if the end of the abbreviation
18070 table is reached. */
18071 if ((unsigned int) (abbrev_ptr - section->buffer) >= section->size)
18073 abbrev_number = read_unsigned_leb128 (abfd, abbrev_ptr, &bytes_read);
18074 abbrev_ptr += bytes_read;
18075 if (abbrev_table->lookup_abbrev (abbrev_number) != NULL)
18080 return abbrev_table;
18083 /* Returns nonzero if TAG represents a type that we might generate a partial
18087 is_type_tag_for_partial (int tag)
18092 /* Some types that would be reasonable to generate partial symbols for,
18093 that we don't at present. */
18094 case DW_TAG_array_type:
18095 case DW_TAG_file_type:
18096 case DW_TAG_ptr_to_member_type:
18097 case DW_TAG_set_type:
18098 case DW_TAG_string_type:
18099 case DW_TAG_subroutine_type:
18101 case DW_TAG_base_type:
18102 case DW_TAG_class_type:
18103 case DW_TAG_interface_type:
18104 case DW_TAG_enumeration_type:
18105 case DW_TAG_structure_type:
18106 case DW_TAG_subrange_type:
18107 case DW_TAG_typedef:
18108 case DW_TAG_union_type:
18115 /* Load all DIEs that are interesting for partial symbols into memory. */
18117 static struct partial_die_info *
18118 load_partial_dies (const struct die_reader_specs *reader,
18119 const gdb_byte *info_ptr, int building_psymtab)
18121 struct dwarf2_cu *cu = reader->cu;
18122 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
18123 struct partial_die_info *parent_die, *last_die, *first_die = NULL;
18124 unsigned int bytes_read;
18125 unsigned int load_all = 0;
18126 int nesting_level = 1;
18131 gdb_assert (cu->per_cu != NULL);
18132 if (cu->per_cu->load_all_dies)
18136 = htab_create_alloc_ex (cu->header.length / 12,
18140 &cu->comp_unit_obstack,
18141 hashtab_obstack_allocate,
18142 dummy_obstack_deallocate);
18146 abbrev_info *abbrev = peek_die_abbrev (*reader, info_ptr, &bytes_read);
18148 /* A NULL abbrev means the end of a series of children. */
18149 if (abbrev == NULL)
18151 if (--nesting_level == 0)
18154 info_ptr += bytes_read;
18155 last_die = parent_die;
18156 parent_die = parent_die->die_parent;
18160 /* Check for template arguments. We never save these; if
18161 they're seen, we just mark the parent, and go on our way. */
18162 if (parent_die != NULL
18163 && cu->language == language_cplus
18164 && (abbrev->tag == DW_TAG_template_type_param
18165 || abbrev->tag == DW_TAG_template_value_param))
18167 parent_die->has_template_arguments = 1;
18171 /* We don't need a partial DIE for the template argument. */
18172 info_ptr = skip_one_die (reader, info_ptr + bytes_read, abbrev);
18177 /* We only recurse into c++ subprograms looking for template arguments.
18178 Skip their other children. */
18180 && cu->language == language_cplus
18181 && parent_die != NULL
18182 && parent_die->tag == DW_TAG_subprogram)
18184 info_ptr = skip_one_die (reader, info_ptr + bytes_read, abbrev);
18188 /* Check whether this DIE is interesting enough to save. Normally
18189 we would not be interested in members here, but there may be
18190 later variables referencing them via DW_AT_specification (for
18191 static members). */
18193 && !is_type_tag_for_partial (abbrev->tag)
18194 && abbrev->tag != DW_TAG_constant
18195 && abbrev->tag != DW_TAG_enumerator
18196 && abbrev->tag != DW_TAG_subprogram
18197 && abbrev->tag != DW_TAG_inlined_subroutine
18198 && abbrev->tag != DW_TAG_lexical_block
18199 && abbrev->tag != DW_TAG_variable
18200 && abbrev->tag != DW_TAG_namespace
18201 && abbrev->tag != DW_TAG_module
18202 && abbrev->tag != DW_TAG_member
18203 && abbrev->tag != DW_TAG_imported_unit
18204 && abbrev->tag != DW_TAG_imported_declaration)
18206 /* Otherwise we skip to the next sibling, if any. */
18207 info_ptr = skip_one_die (reader, info_ptr + bytes_read, abbrev);
18211 struct partial_die_info pdi ((sect_offset) (info_ptr - reader->buffer),
18214 info_ptr = pdi.read (reader, *abbrev, info_ptr + bytes_read);
18216 /* This two-pass algorithm for processing partial symbols has a
18217 high cost in cache pressure. Thus, handle some simple cases
18218 here which cover the majority of C partial symbols. DIEs
18219 which neither have specification tags in them, nor could have
18220 specification tags elsewhere pointing at them, can simply be
18221 processed and discarded.
18223 This segment is also optional; scan_partial_symbols and
18224 add_partial_symbol will handle these DIEs if we chain
18225 them in normally. When compilers which do not emit large
18226 quantities of duplicate debug information are more common,
18227 this code can probably be removed. */
18229 /* Any complete simple types at the top level (pretty much all
18230 of them, for a language without namespaces), can be processed
18232 if (parent_die == NULL
18233 && pdi.has_specification == 0
18234 && pdi.is_declaration == 0
18235 && ((pdi.tag == DW_TAG_typedef && !pdi.has_children)
18236 || pdi.tag == DW_TAG_base_type
18237 || pdi.tag == DW_TAG_subrange_type))
18239 if (building_psymtab && pdi.name != NULL)
18240 add_psymbol_to_list (pdi.name, strlen (pdi.name), 0,
18241 VAR_DOMAIN, LOC_TYPEDEF,
18242 &objfile->static_psymbols,
18243 0, cu->language, objfile);
18244 info_ptr = locate_pdi_sibling (reader, &pdi, info_ptr);
18248 /* The exception for DW_TAG_typedef with has_children above is
18249 a workaround of GCC PR debug/47510. In the case of this complaint
18250 type_name_or_error will error on such types later.
18252 GDB skipped children of DW_TAG_typedef by the shortcut above and then
18253 it could not find the child DIEs referenced later, this is checked
18254 above. In correct DWARF DW_TAG_typedef should have no children. */
18256 if (pdi.tag == DW_TAG_typedef && pdi.has_children)
18257 complaint (_("DW_TAG_typedef has childen - GCC PR debug/47510 bug "
18258 "- DIE at %s [in module %s]"),
18259 sect_offset_str (pdi.sect_off), objfile_name (objfile));
18261 /* If we're at the second level, and we're an enumerator, and
18262 our parent has no specification (meaning possibly lives in a
18263 namespace elsewhere), then we can add the partial symbol now
18264 instead of queueing it. */
18265 if (pdi.tag == DW_TAG_enumerator
18266 && parent_die != NULL
18267 && parent_die->die_parent == NULL
18268 && parent_die->tag == DW_TAG_enumeration_type
18269 && parent_die->has_specification == 0)
18271 if (pdi.name == NULL)
18272 complaint (_("malformed enumerator DIE ignored"));
18273 else if (building_psymtab)
18274 add_psymbol_to_list (pdi.name, strlen (pdi.name), 0,
18275 VAR_DOMAIN, LOC_CONST,
18276 cu->language == language_cplus
18277 ? &objfile->global_psymbols
18278 : &objfile->static_psymbols,
18279 0, cu->language, objfile);
18281 info_ptr = locate_pdi_sibling (reader, &pdi, info_ptr);
18285 struct partial_die_info *part_die
18286 = new (&cu->comp_unit_obstack) partial_die_info (pdi);
18288 /* We'll save this DIE so link it in. */
18289 part_die->die_parent = parent_die;
18290 part_die->die_sibling = NULL;
18291 part_die->die_child = NULL;
18293 if (last_die && last_die == parent_die)
18294 last_die->die_child = part_die;
18296 last_die->die_sibling = part_die;
18298 last_die = part_die;
18300 if (first_die == NULL)
18301 first_die = part_die;
18303 /* Maybe add the DIE to the hash table. Not all DIEs that we
18304 find interesting need to be in the hash table, because we
18305 also have the parent/sibling/child chains; only those that we
18306 might refer to by offset later during partial symbol reading.
18308 For now this means things that might have be the target of a
18309 DW_AT_specification, DW_AT_abstract_origin, or
18310 DW_AT_extension. DW_AT_extension will refer only to
18311 namespaces; DW_AT_abstract_origin refers to functions (and
18312 many things under the function DIE, but we do not recurse
18313 into function DIEs during partial symbol reading) and
18314 possibly variables as well; DW_AT_specification refers to
18315 declarations. Declarations ought to have the DW_AT_declaration
18316 flag. It happens that GCC forgets to put it in sometimes, but
18317 only for functions, not for types.
18319 Adding more things than necessary to the hash table is harmless
18320 except for the performance cost. Adding too few will result in
18321 wasted time in find_partial_die, when we reread the compilation
18322 unit with load_all_dies set. */
18325 || abbrev->tag == DW_TAG_constant
18326 || abbrev->tag == DW_TAG_subprogram
18327 || abbrev->tag == DW_TAG_variable
18328 || abbrev->tag == DW_TAG_namespace
18329 || part_die->is_declaration)
18333 slot = htab_find_slot_with_hash (cu->partial_dies, part_die,
18334 to_underlying (part_die->sect_off),
18339 /* For some DIEs we want to follow their children (if any). For C
18340 we have no reason to follow the children of structures; for other
18341 languages we have to, so that we can get at method physnames
18342 to infer fully qualified class names, for DW_AT_specification,
18343 and for C++ template arguments. For C++, we also look one level
18344 inside functions to find template arguments (if the name of the
18345 function does not already contain the template arguments).
18347 For Ada, we need to scan the children of subprograms and lexical
18348 blocks as well because Ada allows the definition of nested
18349 entities that could be interesting for the debugger, such as
18350 nested subprograms for instance. */
18351 if (last_die->has_children
18353 || last_die->tag == DW_TAG_namespace
18354 || last_die->tag == DW_TAG_module
18355 || last_die->tag == DW_TAG_enumeration_type
18356 || (cu->language == language_cplus
18357 && last_die->tag == DW_TAG_subprogram
18358 && (last_die->name == NULL
18359 || strchr (last_die->name, '<') == NULL))
18360 || (cu->language != language_c
18361 && (last_die->tag == DW_TAG_class_type
18362 || last_die->tag == DW_TAG_interface_type
18363 || last_die->tag == DW_TAG_structure_type
18364 || last_die->tag == DW_TAG_union_type))
18365 || (cu->language == language_ada
18366 && (last_die->tag == DW_TAG_subprogram
18367 || last_die->tag == DW_TAG_lexical_block))))
18370 parent_die = last_die;
18374 /* Otherwise we skip to the next sibling, if any. */
18375 info_ptr = locate_pdi_sibling (reader, last_die, info_ptr);
18377 /* Back to the top, do it again. */
18381 partial_die_info::partial_die_info (sect_offset sect_off_,
18382 struct abbrev_info *abbrev)
18383 : partial_die_info (sect_off_, abbrev->tag, abbrev->has_children)
18387 /* Read a minimal amount of information into the minimal die structure.
18388 INFO_PTR should point just after the initial uleb128 of a DIE. */
18391 partial_die_info::read (const struct die_reader_specs *reader,
18392 const struct abbrev_info &abbrev, const gdb_byte *info_ptr)
18394 struct dwarf2_cu *cu = reader->cu;
18395 struct dwarf2_per_objfile *dwarf2_per_objfile
18396 = cu->per_cu->dwarf2_per_objfile;
18398 int has_low_pc_attr = 0;
18399 int has_high_pc_attr = 0;
18400 int high_pc_relative = 0;
18402 for (i = 0; i < abbrev.num_attrs; ++i)
18404 struct attribute attr;
18406 info_ptr = read_attribute (reader, &attr, &abbrev.attrs[i], info_ptr);
18408 /* Store the data if it is of an attribute we want to keep in a
18409 partial symbol table. */
18415 case DW_TAG_compile_unit:
18416 case DW_TAG_partial_unit:
18417 case DW_TAG_type_unit:
18418 /* Compilation units have a DW_AT_name that is a filename, not
18419 a source language identifier. */
18420 case DW_TAG_enumeration_type:
18421 case DW_TAG_enumerator:
18422 /* These tags always have simple identifiers already; no need
18423 to canonicalize them. */
18424 name = DW_STRING (&attr);
18428 struct objfile *objfile = dwarf2_per_objfile->objfile;
18431 = dwarf2_canonicalize_name (DW_STRING (&attr), cu,
18432 &objfile->per_bfd->storage_obstack);
18437 case DW_AT_linkage_name:
18438 case DW_AT_MIPS_linkage_name:
18439 /* Note that both forms of linkage name might appear. We
18440 assume they will be the same, and we only store the last
18442 if (cu->language == language_ada)
18443 name = DW_STRING (&attr);
18444 linkage_name = DW_STRING (&attr);
18447 has_low_pc_attr = 1;
18448 lowpc = attr_value_as_address (&attr);
18450 case DW_AT_high_pc:
18451 has_high_pc_attr = 1;
18452 highpc = attr_value_as_address (&attr);
18453 if (cu->header.version >= 4 && attr_form_is_constant (&attr))
18454 high_pc_relative = 1;
18456 case DW_AT_location:
18457 /* Support the .debug_loc offsets. */
18458 if (attr_form_is_block (&attr))
18460 d.locdesc = DW_BLOCK (&attr);
18462 else if (attr_form_is_section_offset (&attr))
18464 dwarf2_complex_location_expr_complaint ();
18468 dwarf2_invalid_attrib_class_complaint ("DW_AT_location",
18469 "partial symbol information");
18472 case DW_AT_external:
18473 is_external = DW_UNSND (&attr);
18475 case DW_AT_declaration:
18476 is_declaration = DW_UNSND (&attr);
18481 case DW_AT_abstract_origin:
18482 case DW_AT_specification:
18483 case DW_AT_extension:
18484 has_specification = 1;
18485 spec_offset = dwarf2_get_ref_die_offset (&attr);
18486 spec_is_dwz = (attr.form == DW_FORM_GNU_ref_alt
18487 || cu->per_cu->is_dwz);
18489 case DW_AT_sibling:
18490 /* Ignore absolute siblings, they might point outside of
18491 the current compile unit. */
18492 if (attr.form == DW_FORM_ref_addr)
18493 complaint (_("ignoring absolute DW_AT_sibling"));
18496 const gdb_byte *buffer = reader->buffer;
18497 sect_offset off = dwarf2_get_ref_die_offset (&attr);
18498 const gdb_byte *sibling_ptr = buffer + to_underlying (off);
18500 if (sibling_ptr < info_ptr)
18501 complaint (_("DW_AT_sibling points backwards"));
18502 else if (sibling_ptr > reader->buffer_end)
18503 dwarf2_section_buffer_overflow_complaint (reader->die_section);
18505 sibling = sibling_ptr;
18508 case DW_AT_byte_size:
18511 case DW_AT_const_value:
18512 has_const_value = 1;
18514 case DW_AT_calling_convention:
18515 /* DWARF doesn't provide a way to identify a program's source-level
18516 entry point. DW_AT_calling_convention attributes are only meant
18517 to describe functions' calling conventions.
18519 However, because it's a necessary piece of information in
18520 Fortran, and before DWARF 4 DW_CC_program was the only
18521 piece of debugging information whose definition refers to
18522 a 'main program' at all, several compilers marked Fortran
18523 main programs with DW_CC_program --- even when those
18524 functions use the standard calling conventions.
18526 Although DWARF now specifies a way to provide this
18527 information, we support this practice for backward
18529 if (DW_UNSND (&attr) == DW_CC_program
18530 && cu->language == language_fortran)
18531 main_subprogram = 1;
18534 if (DW_UNSND (&attr) == DW_INL_inlined
18535 || DW_UNSND (&attr) == DW_INL_declared_inlined)
18536 may_be_inlined = 1;
18540 if (tag == DW_TAG_imported_unit)
18542 d.sect_off = dwarf2_get_ref_die_offset (&attr);
18543 is_dwz = (attr.form == DW_FORM_GNU_ref_alt
18544 || cu->per_cu->is_dwz);
18548 case DW_AT_main_subprogram:
18549 main_subprogram = DW_UNSND (&attr);
18557 if (high_pc_relative)
18560 if (has_low_pc_attr && has_high_pc_attr)
18562 /* When using the GNU linker, .gnu.linkonce. sections are used to
18563 eliminate duplicate copies of functions and vtables and such.
18564 The linker will arbitrarily choose one and discard the others.
18565 The AT_*_pc values for such functions refer to local labels in
18566 these sections. If the section from that file was discarded, the
18567 labels are not in the output, so the relocs get a value of 0.
18568 If this is a discarded function, mark the pc bounds as invalid,
18569 so that GDB will ignore it. */
18570 if (lowpc == 0 && !dwarf2_per_objfile->has_section_at_zero)
18572 struct objfile *objfile = dwarf2_per_objfile->objfile;
18573 struct gdbarch *gdbarch = get_objfile_arch (objfile);
18575 complaint (_("DW_AT_low_pc %s is zero "
18576 "for DIE at %s [in module %s]"),
18577 paddress (gdbarch, lowpc),
18578 sect_offset_str (sect_off),
18579 objfile_name (objfile));
18581 /* dwarf2_get_pc_bounds has also the strict low < high requirement. */
18582 else if (lowpc >= highpc)
18584 struct objfile *objfile = dwarf2_per_objfile->objfile;
18585 struct gdbarch *gdbarch = get_objfile_arch (objfile);
18587 complaint (_("DW_AT_low_pc %s is not < DW_AT_high_pc %s "
18588 "for DIE at %s [in module %s]"),
18589 paddress (gdbarch, lowpc),
18590 paddress (gdbarch, highpc),
18591 sect_offset_str (sect_off),
18592 objfile_name (objfile));
18601 /* Find a cached partial DIE at OFFSET in CU. */
18603 struct partial_die_info *
18604 dwarf2_cu::find_partial_die (sect_offset sect_off)
18606 struct partial_die_info *lookup_die = NULL;
18607 struct partial_die_info part_die (sect_off);
18609 lookup_die = ((struct partial_die_info *)
18610 htab_find_with_hash (partial_dies, &part_die,
18611 to_underlying (sect_off)));
18616 /* Find a partial DIE at OFFSET, which may or may not be in CU,
18617 except in the case of .debug_types DIEs which do not reference
18618 outside their CU (they do however referencing other types via
18619 DW_FORM_ref_sig8). */
18621 static struct partial_die_info *
18622 find_partial_die (sect_offset sect_off, int offset_in_dwz, struct dwarf2_cu *cu)
18624 struct dwarf2_per_objfile *dwarf2_per_objfile
18625 = cu->per_cu->dwarf2_per_objfile;
18626 struct objfile *objfile = dwarf2_per_objfile->objfile;
18627 struct dwarf2_per_cu_data *per_cu = NULL;
18628 struct partial_die_info *pd = NULL;
18630 if (offset_in_dwz == cu->per_cu->is_dwz
18631 && offset_in_cu_p (&cu->header, sect_off))
18633 pd = cu->find_partial_die (sect_off);
18636 /* We missed recording what we needed.
18637 Load all dies and try again. */
18638 per_cu = cu->per_cu;
18642 /* TUs don't reference other CUs/TUs (except via type signatures). */
18643 if (cu->per_cu->is_debug_types)
18645 error (_("Dwarf Error: Type Unit at offset %s contains"
18646 " external reference to offset %s [in module %s].\n"),
18647 sect_offset_str (cu->header.sect_off), sect_offset_str (sect_off),
18648 bfd_get_filename (objfile->obfd));
18650 per_cu = dwarf2_find_containing_comp_unit (sect_off, offset_in_dwz,
18651 dwarf2_per_objfile);
18653 if (per_cu->cu == NULL || per_cu->cu->partial_dies == NULL)
18654 load_partial_comp_unit (per_cu);
18656 per_cu->cu->last_used = 0;
18657 pd = per_cu->cu->find_partial_die (sect_off);
18660 /* If we didn't find it, and not all dies have been loaded,
18661 load them all and try again. */
18663 if (pd == NULL && per_cu->load_all_dies == 0)
18665 per_cu->load_all_dies = 1;
18667 /* This is nasty. When we reread the DIEs, somewhere up the call chain
18668 THIS_CU->cu may already be in use. So we can't just free it and
18669 replace its DIEs with the ones we read in. Instead, we leave those
18670 DIEs alone (which can still be in use, e.g. in scan_partial_symbols),
18671 and clobber THIS_CU->cu->partial_dies with the hash table for the new
18673 load_partial_comp_unit (per_cu);
18675 pd = per_cu->cu->find_partial_die (sect_off);
18679 internal_error (__FILE__, __LINE__,
18680 _("could not find partial DIE %s "
18681 "in cache [from module %s]\n"),
18682 sect_offset_str (sect_off), bfd_get_filename (objfile->obfd));
18686 /* See if we can figure out if the class lives in a namespace. We do
18687 this by looking for a member function; its demangled name will
18688 contain namespace info, if there is any. */
18691 guess_partial_die_structure_name (struct partial_die_info *struct_pdi,
18692 struct dwarf2_cu *cu)
18694 /* NOTE: carlton/2003-10-07: Getting the info this way changes
18695 what template types look like, because the demangler
18696 frequently doesn't give the same name as the debug info. We
18697 could fix this by only using the demangled name to get the
18698 prefix (but see comment in read_structure_type). */
18700 struct partial_die_info *real_pdi;
18701 struct partial_die_info *child_pdi;
18703 /* If this DIE (this DIE's specification, if any) has a parent, then
18704 we should not do this. We'll prepend the parent's fully qualified
18705 name when we create the partial symbol. */
18707 real_pdi = struct_pdi;
18708 while (real_pdi->has_specification)
18709 real_pdi = find_partial_die (real_pdi->spec_offset,
18710 real_pdi->spec_is_dwz, cu);
18712 if (real_pdi->die_parent != NULL)
18715 for (child_pdi = struct_pdi->die_child;
18717 child_pdi = child_pdi->die_sibling)
18719 if (child_pdi->tag == DW_TAG_subprogram
18720 && child_pdi->linkage_name != NULL)
18722 char *actual_class_name
18723 = language_class_name_from_physname (cu->language_defn,
18724 child_pdi->linkage_name);
18725 if (actual_class_name != NULL)
18727 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
18730 obstack_copy0 (&objfile->per_bfd->storage_obstack,
18732 strlen (actual_class_name)));
18733 xfree (actual_class_name);
18741 partial_die_info::fixup (struct dwarf2_cu *cu)
18743 /* Once we've fixed up a die, there's no point in doing so again.
18744 This also avoids a memory leak if we were to call
18745 guess_partial_die_structure_name multiple times. */
18749 /* If we found a reference attribute and the DIE has no name, try
18750 to find a name in the referred to DIE. */
18752 if (name == NULL && has_specification)
18754 struct partial_die_info *spec_die;
18756 spec_die = find_partial_die (spec_offset, spec_is_dwz, cu);
18758 spec_die->fixup (cu);
18760 if (spec_die->name)
18762 name = spec_die->name;
18764 /* Copy DW_AT_external attribute if it is set. */
18765 if (spec_die->is_external)
18766 is_external = spec_die->is_external;
18770 /* Set default names for some unnamed DIEs. */
18772 if (name == NULL && tag == DW_TAG_namespace)
18773 name = CP_ANONYMOUS_NAMESPACE_STR;
18775 /* If there is no parent die to provide a namespace, and there are
18776 children, see if we can determine the namespace from their linkage
18778 if (cu->language == language_cplus
18779 && !VEC_empty (dwarf2_section_info_def,
18780 cu->per_cu->dwarf2_per_objfile->types)
18781 && die_parent == NULL
18783 && (tag == DW_TAG_class_type
18784 || tag == DW_TAG_structure_type
18785 || tag == DW_TAG_union_type))
18786 guess_partial_die_structure_name (this, cu);
18788 /* GCC might emit a nameless struct or union that has a linkage
18789 name. See http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47510. */
18791 && (tag == DW_TAG_class_type
18792 || tag == DW_TAG_interface_type
18793 || tag == DW_TAG_structure_type
18794 || tag == DW_TAG_union_type)
18795 && linkage_name != NULL)
18799 demangled = gdb_demangle (linkage_name, DMGL_TYPES);
18804 /* Strip any leading namespaces/classes, keep only the base name.
18805 DW_AT_name for named DIEs does not contain the prefixes. */
18806 base = strrchr (demangled, ':');
18807 if (base && base > demangled && base[-1] == ':')
18812 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
18815 obstack_copy0 (&objfile->per_bfd->storage_obstack,
18816 base, strlen (base)));
18824 /* Read an attribute value described by an attribute form. */
18826 static const gdb_byte *
18827 read_attribute_value (const struct die_reader_specs *reader,
18828 struct attribute *attr, unsigned form,
18829 LONGEST implicit_const, const gdb_byte *info_ptr)
18831 struct dwarf2_cu *cu = reader->cu;
18832 struct dwarf2_per_objfile *dwarf2_per_objfile
18833 = cu->per_cu->dwarf2_per_objfile;
18834 struct objfile *objfile = dwarf2_per_objfile->objfile;
18835 struct gdbarch *gdbarch = get_objfile_arch (objfile);
18836 bfd *abfd = reader->abfd;
18837 struct comp_unit_head *cu_header = &cu->header;
18838 unsigned int bytes_read;
18839 struct dwarf_block *blk;
18841 attr->form = (enum dwarf_form) form;
18844 case DW_FORM_ref_addr:
18845 if (cu->header.version == 2)
18846 DW_UNSND (attr) = read_address (abfd, info_ptr, cu, &bytes_read);
18848 DW_UNSND (attr) = read_offset (abfd, info_ptr,
18849 &cu->header, &bytes_read);
18850 info_ptr += bytes_read;
18852 case DW_FORM_GNU_ref_alt:
18853 DW_UNSND (attr) = read_offset (abfd, info_ptr, &cu->header, &bytes_read);
18854 info_ptr += bytes_read;
18857 DW_ADDR (attr) = read_address (abfd, info_ptr, cu, &bytes_read);
18858 DW_ADDR (attr) = gdbarch_adjust_dwarf2_addr (gdbarch, DW_ADDR (attr));
18859 info_ptr += bytes_read;
18861 case DW_FORM_block2:
18862 blk = dwarf_alloc_block (cu);
18863 blk->size = read_2_bytes (abfd, info_ptr);
18865 blk->data = read_n_bytes (abfd, info_ptr, blk->size);
18866 info_ptr += blk->size;
18867 DW_BLOCK (attr) = blk;
18869 case DW_FORM_block4:
18870 blk = dwarf_alloc_block (cu);
18871 blk->size = read_4_bytes (abfd, info_ptr);
18873 blk->data = read_n_bytes (abfd, info_ptr, blk->size);
18874 info_ptr += blk->size;
18875 DW_BLOCK (attr) = blk;
18877 case DW_FORM_data2:
18878 DW_UNSND (attr) = read_2_bytes (abfd, info_ptr);
18881 case DW_FORM_data4:
18882 DW_UNSND (attr) = read_4_bytes (abfd, info_ptr);
18885 case DW_FORM_data8:
18886 DW_UNSND (attr) = read_8_bytes (abfd, info_ptr);
18889 case DW_FORM_data16:
18890 blk = dwarf_alloc_block (cu);
18892 blk->data = read_n_bytes (abfd, info_ptr, 16);
18894 DW_BLOCK (attr) = blk;
18896 case DW_FORM_sec_offset:
18897 DW_UNSND (attr) = read_offset (abfd, info_ptr, &cu->header, &bytes_read);
18898 info_ptr += bytes_read;
18900 case DW_FORM_string:
18901 DW_STRING (attr) = read_direct_string (abfd, info_ptr, &bytes_read);
18902 DW_STRING_IS_CANONICAL (attr) = 0;
18903 info_ptr += bytes_read;
18906 if (!cu->per_cu->is_dwz)
18908 DW_STRING (attr) = read_indirect_string (dwarf2_per_objfile,
18909 abfd, info_ptr, cu_header,
18911 DW_STRING_IS_CANONICAL (attr) = 0;
18912 info_ptr += bytes_read;
18916 case DW_FORM_line_strp:
18917 if (!cu->per_cu->is_dwz)
18919 DW_STRING (attr) = read_indirect_line_string (dwarf2_per_objfile,
18921 cu_header, &bytes_read);
18922 DW_STRING_IS_CANONICAL (attr) = 0;
18923 info_ptr += bytes_read;
18927 case DW_FORM_GNU_strp_alt:
18929 struct dwz_file *dwz = dwarf2_get_dwz_file (dwarf2_per_objfile);
18930 LONGEST str_offset = read_offset (abfd, info_ptr, cu_header,
18933 DW_STRING (attr) = read_indirect_string_from_dwz (objfile,
18935 DW_STRING_IS_CANONICAL (attr) = 0;
18936 info_ptr += bytes_read;
18939 case DW_FORM_exprloc:
18940 case DW_FORM_block:
18941 blk = dwarf_alloc_block (cu);
18942 blk->size = read_unsigned_leb128 (abfd, info_ptr, &bytes_read);
18943 info_ptr += bytes_read;
18944 blk->data = read_n_bytes (abfd, info_ptr, blk->size);
18945 info_ptr += blk->size;
18946 DW_BLOCK (attr) = blk;
18948 case DW_FORM_block1:
18949 blk = dwarf_alloc_block (cu);
18950 blk->size = read_1_byte (abfd, info_ptr);
18952 blk->data = read_n_bytes (abfd, info_ptr, blk->size);
18953 info_ptr += blk->size;
18954 DW_BLOCK (attr) = blk;
18956 case DW_FORM_data1:
18957 DW_UNSND (attr) = read_1_byte (abfd, info_ptr);
18961 DW_UNSND (attr) = read_1_byte (abfd, info_ptr);
18964 case DW_FORM_flag_present:
18965 DW_UNSND (attr) = 1;
18967 case DW_FORM_sdata:
18968 DW_SND (attr) = read_signed_leb128 (abfd, info_ptr, &bytes_read);
18969 info_ptr += bytes_read;
18971 case DW_FORM_udata:
18972 DW_UNSND (attr) = read_unsigned_leb128 (abfd, info_ptr, &bytes_read);
18973 info_ptr += bytes_read;
18976 DW_UNSND (attr) = (to_underlying (cu->header.sect_off)
18977 + read_1_byte (abfd, info_ptr));
18981 DW_UNSND (attr) = (to_underlying (cu->header.sect_off)
18982 + read_2_bytes (abfd, info_ptr));
18986 DW_UNSND (attr) = (to_underlying (cu->header.sect_off)
18987 + read_4_bytes (abfd, info_ptr));
18991 DW_UNSND (attr) = (to_underlying (cu->header.sect_off)
18992 + read_8_bytes (abfd, info_ptr));
18995 case DW_FORM_ref_sig8:
18996 DW_SIGNATURE (attr) = read_8_bytes (abfd, info_ptr);
18999 case DW_FORM_ref_udata:
19000 DW_UNSND (attr) = (to_underlying (cu->header.sect_off)
19001 + read_unsigned_leb128 (abfd, info_ptr, &bytes_read));
19002 info_ptr += bytes_read;
19004 case DW_FORM_indirect:
19005 form = read_unsigned_leb128 (abfd, info_ptr, &bytes_read);
19006 info_ptr += bytes_read;
19007 if (form == DW_FORM_implicit_const)
19009 implicit_const = read_signed_leb128 (abfd, info_ptr, &bytes_read);
19010 info_ptr += bytes_read;
19012 info_ptr = read_attribute_value (reader, attr, form, implicit_const,
19015 case DW_FORM_implicit_const:
19016 DW_SND (attr) = implicit_const;
19018 case DW_FORM_GNU_addr_index:
19019 if (reader->dwo_file == NULL)
19021 /* For now flag a hard error.
19022 Later we can turn this into a complaint. */
19023 error (_("Dwarf Error: %s found in non-DWO CU [in module %s]"),
19024 dwarf_form_name (form),
19025 bfd_get_filename (abfd));
19027 DW_ADDR (attr) = read_addr_index_from_leb128 (cu, info_ptr, &bytes_read);
19028 info_ptr += bytes_read;
19030 case DW_FORM_GNU_str_index:
19031 if (reader->dwo_file == NULL)
19033 /* For now flag a hard error.
19034 Later we can turn this into a complaint if warranted. */
19035 error (_("Dwarf Error: %s found in non-DWO CU [in module %s]"),
19036 dwarf_form_name (form),
19037 bfd_get_filename (abfd));
19040 ULONGEST str_index =
19041 read_unsigned_leb128 (abfd, info_ptr, &bytes_read);
19043 DW_STRING (attr) = read_str_index (reader, str_index);
19044 DW_STRING_IS_CANONICAL (attr) = 0;
19045 info_ptr += bytes_read;
19049 error (_("Dwarf Error: Cannot handle %s in DWARF reader [in module %s]"),
19050 dwarf_form_name (form),
19051 bfd_get_filename (abfd));
19055 if (cu->per_cu->is_dwz && attr_form_is_ref (attr))
19056 attr->form = DW_FORM_GNU_ref_alt;
19058 /* We have seen instances where the compiler tried to emit a byte
19059 size attribute of -1 which ended up being encoded as an unsigned
19060 0xffffffff. Although 0xffffffff is technically a valid size value,
19061 an object of this size seems pretty unlikely so we can relatively
19062 safely treat these cases as if the size attribute was invalid and
19063 treat them as zero by default. */
19064 if (attr->name == DW_AT_byte_size
19065 && form == DW_FORM_data4
19066 && DW_UNSND (attr) >= 0xffffffff)
19069 (_("Suspicious DW_AT_byte_size value treated as zero instead of %s"),
19070 hex_string (DW_UNSND (attr)));
19071 DW_UNSND (attr) = 0;
19077 /* Read an attribute described by an abbreviated attribute. */
19079 static const gdb_byte *
19080 read_attribute (const struct die_reader_specs *reader,
19081 struct attribute *attr, struct attr_abbrev *abbrev,
19082 const gdb_byte *info_ptr)
19084 attr->name = abbrev->name;
19085 return read_attribute_value (reader, attr, abbrev->form,
19086 abbrev->implicit_const, info_ptr);
19089 /* Read dwarf information from a buffer. */
19091 static unsigned int
19092 read_1_byte (bfd *abfd, const gdb_byte *buf)
19094 return bfd_get_8 (abfd, buf);
19098 read_1_signed_byte (bfd *abfd, const gdb_byte *buf)
19100 return bfd_get_signed_8 (abfd, buf);
19103 static unsigned int
19104 read_2_bytes (bfd *abfd, const gdb_byte *buf)
19106 return bfd_get_16 (abfd, buf);
19110 read_2_signed_bytes (bfd *abfd, const gdb_byte *buf)
19112 return bfd_get_signed_16 (abfd, buf);
19115 static unsigned int
19116 read_4_bytes (bfd *abfd, const gdb_byte *buf)
19118 return bfd_get_32 (abfd, buf);
19122 read_4_signed_bytes (bfd *abfd, const gdb_byte *buf)
19124 return bfd_get_signed_32 (abfd, buf);
19128 read_8_bytes (bfd *abfd, const gdb_byte *buf)
19130 return bfd_get_64 (abfd, buf);
19134 read_address (bfd *abfd, const gdb_byte *buf, struct dwarf2_cu *cu,
19135 unsigned int *bytes_read)
19137 struct comp_unit_head *cu_header = &cu->header;
19138 CORE_ADDR retval = 0;
19140 if (cu_header->signed_addr_p)
19142 switch (cu_header->addr_size)
19145 retval = bfd_get_signed_16 (abfd, buf);
19148 retval = bfd_get_signed_32 (abfd, buf);
19151 retval = bfd_get_signed_64 (abfd, buf);
19154 internal_error (__FILE__, __LINE__,
19155 _("read_address: bad switch, signed [in module %s]"),
19156 bfd_get_filename (abfd));
19161 switch (cu_header->addr_size)
19164 retval = bfd_get_16 (abfd, buf);
19167 retval = bfd_get_32 (abfd, buf);
19170 retval = bfd_get_64 (abfd, buf);
19173 internal_error (__FILE__, __LINE__,
19174 _("read_address: bad switch, "
19175 "unsigned [in module %s]"),
19176 bfd_get_filename (abfd));
19180 *bytes_read = cu_header->addr_size;
19184 /* Read the initial length from a section. The (draft) DWARF 3
19185 specification allows the initial length to take up either 4 bytes
19186 or 12 bytes. If the first 4 bytes are 0xffffffff, then the next 8
19187 bytes describe the length and all offsets will be 8 bytes in length
19190 An older, non-standard 64-bit format is also handled by this
19191 function. The older format in question stores the initial length
19192 as an 8-byte quantity without an escape value. Lengths greater
19193 than 2^32 aren't very common which means that the initial 4 bytes
19194 is almost always zero. Since a length value of zero doesn't make
19195 sense for the 32-bit format, this initial zero can be considered to
19196 be an escape value which indicates the presence of the older 64-bit
19197 format. As written, the code can't detect (old format) lengths
19198 greater than 4GB. If it becomes necessary to handle lengths
19199 somewhat larger than 4GB, we could allow other small values (such
19200 as the non-sensical values of 1, 2, and 3) to also be used as
19201 escape values indicating the presence of the old format.
19203 The value returned via bytes_read should be used to increment the
19204 relevant pointer after calling read_initial_length().
19206 [ Note: read_initial_length() and read_offset() are based on the
19207 document entitled "DWARF Debugging Information Format", revision
19208 3, draft 8, dated November 19, 2001. This document was obtained
19211 http://reality.sgiweb.org/davea/dwarf3-draft8-011125.pdf
19213 This document is only a draft and is subject to change. (So beware.)
19215 Details regarding the older, non-standard 64-bit format were
19216 determined empirically by examining 64-bit ELF files produced by
19217 the SGI toolchain on an IRIX 6.5 machine.
19219 - Kevin, July 16, 2002
19223 read_initial_length (bfd *abfd, const gdb_byte *buf, unsigned int *bytes_read)
19225 LONGEST length = bfd_get_32 (abfd, buf);
19227 if (length == 0xffffffff)
19229 length = bfd_get_64 (abfd, buf + 4);
19232 else if (length == 0)
19234 /* Handle the (non-standard) 64-bit DWARF2 format used by IRIX. */
19235 length = bfd_get_64 (abfd, buf);
19246 /* Cover function for read_initial_length.
19247 Returns the length of the object at BUF, and stores the size of the
19248 initial length in *BYTES_READ and stores the size that offsets will be in
19250 If the initial length size is not equivalent to that specified in
19251 CU_HEADER then issue a complaint.
19252 This is useful when reading non-comp-unit headers. */
19255 read_checked_initial_length_and_offset (bfd *abfd, const gdb_byte *buf,
19256 const struct comp_unit_head *cu_header,
19257 unsigned int *bytes_read,
19258 unsigned int *offset_size)
19260 LONGEST length = read_initial_length (abfd, buf, bytes_read);
19262 gdb_assert (cu_header->initial_length_size == 4
19263 || cu_header->initial_length_size == 8
19264 || cu_header->initial_length_size == 12);
19266 if (cu_header->initial_length_size != *bytes_read)
19267 complaint (_("intermixed 32-bit and 64-bit DWARF sections"));
19269 *offset_size = (*bytes_read == 4) ? 4 : 8;
19273 /* Read an offset from the data stream. The size of the offset is
19274 given by cu_header->offset_size. */
19277 read_offset (bfd *abfd, const gdb_byte *buf,
19278 const struct comp_unit_head *cu_header,
19279 unsigned int *bytes_read)
19281 LONGEST offset = read_offset_1 (abfd, buf, cu_header->offset_size);
19283 *bytes_read = cu_header->offset_size;
19287 /* Read an offset from the data stream. */
19290 read_offset_1 (bfd *abfd, const gdb_byte *buf, unsigned int offset_size)
19292 LONGEST retval = 0;
19294 switch (offset_size)
19297 retval = bfd_get_32 (abfd, buf);
19300 retval = bfd_get_64 (abfd, buf);
19303 internal_error (__FILE__, __LINE__,
19304 _("read_offset_1: bad switch [in module %s]"),
19305 bfd_get_filename (abfd));
19311 static const gdb_byte *
19312 read_n_bytes (bfd *abfd, const gdb_byte *buf, unsigned int size)
19314 /* If the size of a host char is 8 bits, we can return a pointer
19315 to the buffer, otherwise we have to copy the data to a buffer
19316 allocated on the temporary obstack. */
19317 gdb_assert (HOST_CHAR_BIT == 8);
19321 static const char *
19322 read_direct_string (bfd *abfd, const gdb_byte *buf,
19323 unsigned int *bytes_read_ptr)
19325 /* If the size of a host char is 8 bits, we can return a pointer
19326 to the string, otherwise we have to copy the string to a buffer
19327 allocated on the temporary obstack. */
19328 gdb_assert (HOST_CHAR_BIT == 8);
19331 *bytes_read_ptr = 1;
19334 *bytes_read_ptr = strlen ((const char *) buf) + 1;
19335 return (const char *) buf;
19338 /* Return pointer to string at section SECT offset STR_OFFSET with error
19339 reporting strings FORM_NAME and SECT_NAME. */
19341 static const char *
19342 read_indirect_string_at_offset_from (struct objfile *objfile,
19343 bfd *abfd, LONGEST str_offset,
19344 struct dwarf2_section_info *sect,
19345 const char *form_name,
19346 const char *sect_name)
19348 dwarf2_read_section (objfile, sect);
19349 if (sect->buffer == NULL)
19350 error (_("%s used without %s section [in module %s]"),
19351 form_name, sect_name, bfd_get_filename (abfd));
19352 if (str_offset >= sect->size)
19353 error (_("%s pointing outside of %s section [in module %s]"),
19354 form_name, sect_name, bfd_get_filename (abfd));
19355 gdb_assert (HOST_CHAR_BIT == 8);
19356 if (sect->buffer[str_offset] == '\0')
19358 return (const char *) (sect->buffer + str_offset);
19361 /* Return pointer to string at .debug_str offset STR_OFFSET. */
19363 static const char *
19364 read_indirect_string_at_offset (struct dwarf2_per_objfile *dwarf2_per_objfile,
19365 bfd *abfd, LONGEST str_offset)
19367 return read_indirect_string_at_offset_from (dwarf2_per_objfile->objfile,
19369 &dwarf2_per_objfile->str,
19370 "DW_FORM_strp", ".debug_str");
19373 /* Return pointer to string at .debug_line_str offset STR_OFFSET. */
19375 static const char *
19376 read_indirect_line_string_at_offset (struct dwarf2_per_objfile *dwarf2_per_objfile,
19377 bfd *abfd, LONGEST str_offset)
19379 return read_indirect_string_at_offset_from (dwarf2_per_objfile->objfile,
19381 &dwarf2_per_objfile->line_str,
19382 "DW_FORM_line_strp",
19383 ".debug_line_str");
19386 /* Read a string at offset STR_OFFSET in the .debug_str section from
19387 the .dwz file DWZ. Throw an error if the offset is too large. If
19388 the string consists of a single NUL byte, return NULL; otherwise
19389 return a pointer to the string. */
19391 static const char *
19392 read_indirect_string_from_dwz (struct objfile *objfile, struct dwz_file *dwz,
19393 LONGEST str_offset)
19395 dwarf2_read_section (objfile, &dwz->str);
19397 if (dwz->str.buffer == NULL)
19398 error (_("DW_FORM_GNU_strp_alt used without .debug_str "
19399 "section [in module %s]"),
19400 bfd_get_filename (dwz->dwz_bfd));
19401 if (str_offset >= dwz->str.size)
19402 error (_("DW_FORM_GNU_strp_alt pointing outside of "
19403 ".debug_str section [in module %s]"),
19404 bfd_get_filename (dwz->dwz_bfd));
19405 gdb_assert (HOST_CHAR_BIT == 8);
19406 if (dwz->str.buffer[str_offset] == '\0')
19408 return (const char *) (dwz->str.buffer + str_offset);
19411 /* Return pointer to string at .debug_str offset as read from BUF.
19412 BUF is assumed to be in a compilation unit described by CU_HEADER.
19413 Return *BYTES_READ_PTR count of bytes read from BUF. */
19415 static const char *
19416 read_indirect_string (struct dwarf2_per_objfile *dwarf2_per_objfile, bfd *abfd,
19417 const gdb_byte *buf,
19418 const struct comp_unit_head *cu_header,
19419 unsigned int *bytes_read_ptr)
19421 LONGEST str_offset = read_offset (abfd, buf, cu_header, bytes_read_ptr);
19423 return read_indirect_string_at_offset (dwarf2_per_objfile, abfd, str_offset);
19426 /* Return pointer to string at .debug_line_str offset as read from BUF.
19427 BUF is assumed to be in a compilation unit described by CU_HEADER.
19428 Return *BYTES_READ_PTR count of bytes read from BUF. */
19430 static const char *
19431 read_indirect_line_string (struct dwarf2_per_objfile *dwarf2_per_objfile,
19432 bfd *abfd, const gdb_byte *buf,
19433 const struct comp_unit_head *cu_header,
19434 unsigned int *bytes_read_ptr)
19436 LONGEST str_offset = read_offset (abfd, buf, cu_header, bytes_read_ptr);
19438 return read_indirect_line_string_at_offset (dwarf2_per_objfile, abfd,
19443 read_unsigned_leb128 (bfd *abfd, const gdb_byte *buf,
19444 unsigned int *bytes_read_ptr)
19447 unsigned int num_read;
19449 unsigned char byte;
19456 byte = bfd_get_8 (abfd, buf);
19459 result |= ((ULONGEST) (byte & 127) << shift);
19460 if ((byte & 128) == 0)
19466 *bytes_read_ptr = num_read;
19471 read_signed_leb128 (bfd *abfd, const gdb_byte *buf,
19472 unsigned int *bytes_read_ptr)
19475 int shift, num_read;
19476 unsigned char byte;
19483 byte = bfd_get_8 (abfd, buf);
19486 result |= ((LONGEST) (byte & 127) << shift);
19488 if ((byte & 128) == 0)
19493 if ((shift < 8 * sizeof (result)) && (byte & 0x40))
19494 result |= -(((LONGEST) 1) << shift);
19495 *bytes_read_ptr = num_read;
19499 /* Given index ADDR_INDEX in .debug_addr, fetch the value.
19500 ADDR_BASE is the DW_AT_GNU_addr_base attribute or zero.
19501 ADDR_SIZE is the size of addresses from the CU header. */
19504 read_addr_index_1 (struct dwarf2_per_objfile *dwarf2_per_objfile,
19505 unsigned int addr_index, ULONGEST addr_base, int addr_size)
19507 struct objfile *objfile = dwarf2_per_objfile->objfile;
19508 bfd *abfd = objfile->obfd;
19509 const gdb_byte *info_ptr;
19511 dwarf2_read_section (objfile, &dwarf2_per_objfile->addr);
19512 if (dwarf2_per_objfile->addr.buffer == NULL)
19513 error (_("DW_FORM_addr_index used without .debug_addr section [in module %s]"),
19514 objfile_name (objfile));
19515 if (addr_base + addr_index * addr_size >= dwarf2_per_objfile->addr.size)
19516 error (_("DW_FORM_addr_index pointing outside of "
19517 ".debug_addr section [in module %s]"),
19518 objfile_name (objfile));
19519 info_ptr = (dwarf2_per_objfile->addr.buffer
19520 + addr_base + addr_index * addr_size);
19521 if (addr_size == 4)
19522 return bfd_get_32 (abfd, info_ptr);
19524 return bfd_get_64 (abfd, info_ptr);
19527 /* Given index ADDR_INDEX in .debug_addr, fetch the value. */
19530 read_addr_index (struct dwarf2_cu *cu, unsigned int addr_index)
19532 return read_addr_index_1 (cu->per_cu->dwarf2_per_objfile, addr_index,
19533 cu->addr_base, cu->header.addr_size);
19536 /* Given a pointer to an leb128 value, fetch the value from .debug_addr. */
19539 read_addr_index_from_leb128 (struct dwarf2_cu *cu, const gdb_byte *info_ptr,
19540 unsigned int *bytes_read)
19542 bfd *abfd = cu->per_cu->dwarf2_per_objfile->objfile->obfd;
19543 unsigned int addr_index = read_unsigned_leb128 (abfd, info_ptr, bytes_read);
19545 return read_addr_index (cu, addr_index);
19548 /* Data structure to pass results from dwarf2_read_addr_index_reader
19549 back to dwarf2_read_addr_index. */
19551 struct dwarf2_read_addr_index_data
19553 ULONGEST addr_base;
19557 /* die_reader_func for dwarf2_read_addr_index. */
19560 dwarf2_read_addr_index_reader (const struct die_reader_specs *reader,
19561 const gdb_byte *info_ptr,
19562 struct die_info *comp_unit_die,
19566 struct dwarf2_cu *cu = reader->cu;
19567 struct dwarf2_read_addr_index_data *aidata =
19568 (struct dwarf2_read_addr_index_data *) data;
19570 aidata->addr_base = cu->addr_base;
19571 aidata->addr_size = cu->header.addr_size;
19574 /* Given an index in .debug_addr, fetch the value.
19575 NOTE: This can be called during dwarf expression evaluation,
19576 long after the debug information has been read, and thus per_cu->cu
19577 may no longer exist. */
19580 dwarf2_read_addr_index (struct dwarf2_per_cu_data *per_cu,
19581 unsigned int addr_index)
19583 struct dwarf2_per_objfile *dwarf2_per_objfile = per_cu->dwarf2_per_objfile;
19584 struct dwarf2_cu *cu = per_cu->cu;
19585 ULONGEST addr_base;
19588 /* We need addr_base and addr_size.
19589 If we don't have PER_CU->cu, we have to get it.
19590 Nasty, but the alternative is storing the needed info in PER_CU,
19591 which at this point doesn't seem justified: it's not clear how frequently
19592 it would get used and it would increase the size of every PER_CU.
19593 Entry points like dwarf2_per_cu_addr_size do a similar thing
19594 so we're not in uncharted territory here.
19595 Alas we need to be a bit more complicated as addr_base is contained
19598 We don't need to read the entire CU(/TU).
19599 We just need the header and top level die.
19601 IWBN to use the aging mechanism to let us lazily later discard the CU.
19602 For now we skip this optimization. */
19606 addr_base = cu->addr_base;
19607 addr_size = cu->header.addr_size;
19611 struct dwarf2_read_addr_index_data aidata;
19613 /* Note: We can't use init_cutu_and_read_dies_simple here,
19614 we need addr_base. */
19615 init_cutu_and_read_dies (per_cu, NULL, 0, 0, false,
19616 dwarf2_read_addr_index_reader, &aidata);
19617 addr_base = aidata.addr_base;
19618 addr_size = aidata.addr_size;
19621 return read_addr_index_1 (dwarf2_per_objfile, addr_index, addr_base,
19625 /* Given a DW_FORM_GNU_str_index, fetch the string.
19626 This is only used by the Fission support. */
19628 static const char *
19629 read_str_index (const struct die_reader_specs *reader, ULONGEST str_index)
19631 struct dwarf2_cu *cu = reader->cu;
19632 struct dwarf2_per_objfile *dwarf2_per_objfile
19633 = cu->per_cu->dwarf2_per_objfile;
19634 struct objfile *objfile = dwarf2_per_objfile->objfile;
19635 const char *objf_name = objfile_name (objfile);
19636 bfd *abfd = objfile->obfd;
19637 struct dwarf2_section_info *str_section = &reader->dwo_file->sections.str;
19638 struct dwarf2_section_info *str_offsets_section =
19639 &reader->dwo_file->sections.str_offsets;
19640 const gdb_byte *info_ptr;
19641 ULONGEST str_offset;
19642 static const char form_name[] = "DW_FORM_GNU_str_index";
19644 dwarf2_read_section (objfile, str_section);
19645 dwarf2_read_section (objfile, str_offsets_section);
19646 if (str_section->buffer == NULL)
19647 error (_("%s used without .debug_str.dwo section"
19648 " in CU at offset %s [in module %s]"),
19649 form_name, sect_offset_str (cu->header.sect_off), objf_name);
19650 if (str_offsets_section->buffer == NULL)
19651 error (_("%s used without .debug_str_offsets.dwo section"
19652 " in CU at offset %s [in module %s]"),
19653 form_name, sect_offset_str (cu->header.sect_off), objf_name);
19654 if (str_index * cu->header.offset_size >= str_offsets_section->size)
19655 error (_("%s pointing outside of .debug_str_offsets.dwo"
19656 " section in CU at offset %s [in module %s]"),
19657 form_name, sect_offset_str (cu->header.sect_off), objf_name);
19658 info_ptr = (str_offsets_section->buffer
19659 + str_index * cu->header.offset_size);
19660 if (cu->header.offset_size == 4)
19661 str_offset = bfd_get_32 (abfd, info_ptr);
19663 str_offset = bfd_get_64 (abfd, info_ptr);
19664 if (str_offset >= str_section->size)
19665 error (_("Offset from %s pointing outside of"
19666 " .debug_str.dwo section in CU at offset %s [in module %s]"),
19667 form_name, sect_offset_str (cu->header.sect_off), objf_name);
19668 return (const char *) (str_section->buffer + str_offset);
19671 /* Return the length of an LEB128 number in BUF. */
19674 leb128_size (const gdb_byte *buf)
19676 const gdb_byte *begin = buf;
19682 if ((byte & 128) == 0)
19683 return buf - begin;
19688 set_cu_language (unsigned int lang, struct dwarf2_cu *cu)
19697 cu->language = language_c;
19700 case DW_LANG_C_plus_plus:
19701 case DW_LANG_C_plus_plus_11:
19702 case DW_LANG_C_plus_plus_14:
19703 cu->language = language_cplus;
19706 cu->language = language_d;
19708 case DW_LANG_Fortran77:
19709 case DW_LANG_Fortran90:
19710 case DW_LANG_Fortran95:
19711 case DW_LANG_Fortran03:
19712 case DW_LANG_Fortran08:
19713 cu->language = language_fortran;
19716 cu->language = language_go;
19718 case DW_LANG_Mips_Assembler:
19719 cu->language = language_asm;
19721 case DW_LANG_Ada83:
19722 case DW_LANG_Ada95:
19723 cu->language = language_ada;
19725 case DW_LANG_Modula2:
19726 cu->language = language_m2;
19728 case DW_LANG_Pascal83:
19729 cu->language = language_pascal;
19732 cu->language = language_objc;
19735 case DW_LANG_Rust_old:
19736 cu->language = language_rust;
19738 case DW_LANG_Cobol74:
19739 case DW_LANG_Cobol85:
19741 cu->language = language_minimal;
19744 cu->language_defn = language_def (cu->language);
19747 /* Return the named attribute or NULL if not there. */
19749 static struct attribute *
19750 dwarf2_attr (struct die_info *die, unsigned int name, struct dwarf2_cu *cu)
19755 struct attribute *spec = NULL;
19757 for (i = 0; i < die->num_attrs; ++i)
19759 if (die->attrs[i].name == name)
19760 return &die->attrs[i];
19761 if (die->attrs[i].name == DW_AT_specification
19762 || die->attrs[i].name == DW_AT_abstract_origin)
19763 spec = &die->attrs[i];
19769 die = follow_die_ref (die, spec, &cu);
19775 /* Return the named attribute or NULL if not there,
19776 but do not follow DW_AT_specification, etc.
19777 This is for use in contexts where we're reading .debug_types dies.
19778 Following DW_AT_specification, DW_AT_abstract_origin will take us
19779 back up the chain, and we want to go down. */
19781 static struct attribute *
19782 dwarf2_attr_no_follow (struct die_info *die, unsigned int name)
19786 for (i = 0; i < die->num_attrs; ++i)
19787 if (die->attrs[i].name == name)
19788 return &die->attrs[i];
19793 /* Return the string associated with a string-typed attribute, or NULL if it
19794 is either not found or is of an incorrect type. */
19796 static const char *
19797 dwarf2_string_attr (struct die_info *die, unsigned int name, struct dwarf2_cu *cu)
19799 struct attribute *attr;
19800 const char *str = NULL;
19802 attr = dwarf2_attr (die, name, cu);
19806 if (attr->form == DW_FORM_strp || attr->form == DW_FORM_line_strp
19807 || attr->form == DW_FORM_string
19808 || attr->form == DW_FORM_GNU_str_index
19809 || attr->form == DW_FORM_GNU_strp_alt)
19810 str = DW_STRING (attr);
19812 complaint (_("string type expected for attribute %s for "
19813 "DIE at %s in module %s"),
19814 dwarf_attr_name (name), sect_offset_str (die->sect_off),
19815 objfile_name (cu->per_cu->dwarf2_per_objfile->objfile));
19821 /* Return non-zero iff the attribute NAME is defined for the given DIE,
19822 and holds a non-zero value. This function should only be used for
19823 DW_FORM_flag or DW_FORM_flag_present attributes. */
19826 dwarf2_flag_true_p (struct die_info *die, unsigned name, struct dwarf2_cu *cu)
19828 struct attribute *attr = dwarf2_attr (die, name, cu);
19830 return (attr && DW_UNSND (attr));
19834 die_is_declaration (struct die_info *die, struct dwarf2_cu *cu)
19836 /* A DIE is a declaration if it has a DW_AT_declaration attribute
19837 which value is non-zero. However, we have to be careful with
19838 DIEs having a DW_AT_specification attribute, because dwarf2_attr()
19839 (via dwarf2_flag_true_p) follows this attribute. So we may
19840 end up accidently finding a declaration attribute that belongs
19841 to a different DIE referenced by the specification attribute,
19842 even though the given DIE does not have a declaration attribute. */
19843 return (dwarf2_flag_true_p (die, DW_AT_declaration, cu)
19844 && dwarf2_attr (die, DW_AT_specification, cu) == NULL);
19847 /* Return the die giving the specification for DIE, if there is
19848 one. *SPEC_CU is the CU containing DIE on input, and the CU
19849 containing the return value on output. If there is no
19850 specification, but there is an abstract origin, that is
19853 static struct die_info *
19854 die_specification (struct die_info *die, struct dwarf2_cu **spec_cu)
19856 struct attribute *spec_attr = dwarf2_attr (die, DW_AT_specification,
19859 if (spec_attr == NULL)
19860 spec_attr = dwarf2_attr (die, DW_AT_abstract_origin, *spec_cu);
19862 if (spec_attr == NULL)
19865 return follow_die_ref (die, spec_attr, spec_cu);
19868 /* Stub for free_line_header to match void * callback types. */
19871 free_line_header_voidp (void *arg)
19873 struct line_header *lh = (struct line_header *) arg;
19879 line_header::add_include_dir (const char *include_dir)
19881 if (dwarf_line_debug >= 2)
19882 fprintf_unfiltered (gdb_stdlog, "Adding dir %zu: %s\n",
19883 include_dirs.size () + 1, include_dir);
19885 include_dirs.push_back (include_dir);
19889 line_header::add_file_name (const char *name,
19891 unsigned int mod_time,
19892 unsigned int length)
19894 if (dwarf_line_debug >= 2)
19895 fprintf_unfiltered (gdb_stdlog, "Adding file %u: %s\n",
19896 (unsigned) file_names.size () + 1, name);
19898 file_names.emplace_back (name, d_index, mod_time, length);
19901 /* A convenience function to find the proper .debug_line section for a CU. */
19903 static struct dwarf2_section_info *
19904 get_debug_line_section (struct dwarf2_cu *cu)
19906 struct dwarf2_section_info *section;
19907 struct dwarf2_per_objfile *dwarf2_per_objfile
19908 = cu->per_cu->dwarf2_per_objfile;
19910 /* For TUs in DWO files, the DW_AT_stmt_list attribute lives in the
19912 if (cu->dwo_unit && cu->per_cu->is_debug_types)
19913 section = &cu->dwo_unit->dwo_file->sections.line;
19914 else if (cu->per_cu->is_dwz)
19916 struct dwz_file *dwz = dwarf2_get_dwz_file (dwarf2_per_objfile);
19918 section = &dwz->line;
19921 section = &dwarf2_per_objfile->line;
19926 /* Read directory or file name entry format, starting with byte of
19927 format count entries, ULEB128 pairs of entry formats, ULEB128 of
19928 entries count and the entries themselves in the described entry
19932 read_formatted_entries (struct dwarf2_per_objfile *dwarf2_per_objfile,
19933 bfd *abfd, const gdb_byte **bufp,
19934 struct line_header *lh,
19935 const struct comp_unit_head *cu_header,
19936 void (*callback) (struct line_header *lh,
19939 unsigned int mod_time,
19940 unsigned int length))
19942 gdb_byte format_count, formati;
19943 ULONGEST data_count, datai;
19944 const gdb_byte *buf = *bufp;
19945 const gdb_byte *format_header_data;
19946 unsigned int bytes_read;
19948 format_count = read_1_byte (abfd, buf);
19950 format_header_data = buf;
19951 for (formati = 0; formati < format_count; formati++)
19953 read_unsigned_leb128 (abfd, buf, &bytes_read);
19955 read_unsigned_leb128 (abfd, buf, &bytes_read);
19959 data_count = read_unsigned_leb128 (abfd, buf, &bytes_read);
19961 for (datai = 0; datai < data_count; datai++)
19963 const gdb_byte *format = format_header_data;
19964 struct file_entry fe;
19966 for (formati = 0; formati < format_count; formati++)
19968 ULONGEST content_type = read_unsigned_leb128 (abfd, format, &bytes_read);
19969 format += bytes_read;
19971 ULONGEST form = read_unsigned_leb128 (abfd, format, &bytes_read);
19972 format += bytes_read;
19974 gdb::optional<const char *> string;
19975 gdb::optional<unsigned int> uint;
19979 case DW_FORM_string:
19980 string.emplace (read_direct_string (abfd, buf, &bytes_read));
19984 case DW_FORM_line_strp:
19985 string.emplace (read_indirect_line_string (dwarf2_per_objfile,
19992 case DW_FORM_data1:
19993 uint.emplace (read_1_byte (abfd, buf));
19997 case DW_FORM_data2:
19998 uint.emplace (read_2_bytes (abfd, buf));
20002 case DW_FORM_data4:
20003 uint.emplace (read_4_bytes (abfd, buf));
20007 case DW_FORM_data8:
20008 uint.emplace (read_8_bytes (abfd, buf));
20012 case DW_FORM_udata:
20013 uint.emplace (read_unsigned_leb128 (abfd, buf, &bytes_read));
20017 case DW_FORM_block:
20018 /* It is valid only for DW_LNCT_timestamp which is ignored by
20023 switch (content_type)
20026 if (string.has_value ())
20029 case DW_LNCT_directory_index:
20030 if (uint.has_value ())
20031 fe.d_index = (dir_index) *uint;
20033 case DW_LNCT_timestamp:
20034 if (uint.has_value ())
20035 fe.mod_time = *uint;
20038 if (uint.has_value ())
20044 complaint (_("Unknown format content type %s"),
20045 pulongest (content_type));
20049 callback (lh, fe.name, fe.d_index, fe.mod_time, fe.length);
20055 /* Read the statement program header starting at OFFSET in
20056 .debug_line, or .debug_line.dwo. Return a pointer
20057 to a struct line_header, allocated using xmalloc.
20058 Returns NULL if there is a problem reading the header, e.g., if it
20059 has a version we don't understand.
20061 NOTE: the strings in the include directory and file name tables of
20062 the returned object point into the dwarf line section buffer,
20063 and must not be freed. */
20065 static line_header_up
20066 dwarf_decode_line_header (sect_offset sect_off, struct dwarf2_cu *cu)
20068 const gdb_byte *line_ptr;
20069 unsigned int bytes_read, offset_size;
20071 const char *cur_dir, *cur_file;
20072 struct dwarf2_section_info *section;
20074 struct dwarf2_per_objfile *dwarf2_per_objfile
20075 = cu->per_cu->dwarf2_per_objfile;
20077 section = get_debug_line_section (cu);
20078 dwarf2_read_section (dwarf2_per_objfile->objfile, section);
20079 if (section->buffer == NULL)
20081 if (cu->dwo_unit && cu->per_cu->is_debug_types)
20082 complaint (_("missing .debug_line.dwo section"));
20084 complaint (_("missing .debug_line section"));
20088 /* We can't do this until we know the section is non-empty.
20089 Only then do we know we have such a section. */
20090 abfd = get_section_bfd_owner (section);
20092 /* Make sure that at least there's room for the total_length field.
20093 That could be 12 bytes long, but we're just going to fudge that. */
20094 if (to_underlying (sect_off) + 4 >= section->size)
20096 dwarf2_statement_list_fits_in_line_number_section_complaint ();
20100 line_header_up lh (new line_header ());
20102 lh->sect_off = sect_off;
20103 lh->offset_in_dwz = cu->per_cu->is_dwz;
20105 line_ptr = section->buffer + to_underlying (sect_off);
20107 /* Read in the header. */
20109 read_checked_initial_length_and_offset (abfd, line_ptr, &cu->header,
20110 &bytes_read, &offset_size);
20111 line_ptr += bytes_read;
20112 if (line_ptr + lh->total_length > (section->buffer + section->size))
20114 dwarf2_statement_list_fits_in_line_number_section_complaint ();
20117 lh->statement_program_end = line_ptr + lh->total_length;
20118 lh->version = read_2_bytes (abfd, line_ptr);
20120 if (lh->version > 5)
20122 /* This is a version we don't understand. The format could have
20123 changed in ways we don't handle properly so just punt. */
20124 complaint (_("unsupported version in .debug_line section"));
20127 if (lh->version >= 5)
20129 gdb_byte segment_selector_size;
20131 /* Skip address size. */
20132 read_1_byte (abfd, line_ptr);
20135 segment_selector_size = read_1_byte (abfd, line_ptr);
20137 if (segment_selector_size != 0)
20139 complaint (_("unsupported segment selector size %u "
20140 "in .debug_line section"),
20141 segment_selector_size);
20145 lh->header_length = read_offset_1 (abfd, line_ptr, offset_size);
20146 line_ptr += offset_size;
20147 lh->minimum_instruction_length = read_1_byte (abfd, line_ptr);
20149 if (lh->version >= 4)
20151 lh->maximum_ops_per_instruction = read_1_byte (abfd, line_ptr);
20155 lh->maximum_ops_per_instruction = 1;
20157 if (lh->maximum_ops_per_instruction == 0)
20159 lh->maximum_ops_per_instruction = 1;
20160 complaint (_("invalid maximum_ops_per_instruction "
20161 "in `.debug_line' section"));
20164 lh->default_is_stmt = read_1_byte (abfd, line_ptr);
20166 lh->line_base = read_1_signed_byte (abfd, line_ptr);
20168 lh->line_range = read_1_byte (abfd, line_ptr);
20170 lh->opcode_base = read_1_byte (abfd, line_ptr);
20172 lh->standard_opcode_lengths.reset (new unsigned char[lh->opcode_base]);
20174 lh->standard_opcode_lengths[0] = 1; /* This should never be used anyway. */
20175 for (i = 1; i < lh->opcode_base; ++i)
20177 lh->standard_opcode_lengths[i] = read_1_byte (abfd, line_ptr);
20181 if (lh->version >= 5)
20183 /* Read directory table. */
20184 read_formatted_entries (dwarf2_per_objfile, abfd, &line_ptr, lh.get (),
20186 [] (struct line_header *lh, const char *name,
20187 dir_index d_index, unsigned int mod_time,
20188 unsigned int length)
20190 lh->add_include_dir (name);
20193 /* Read file name table. */
20194 read_formatted_entries (dwarf2_per_objfile, abfd, &line_ptr, lh.get (),
20196 [] (struct line_header *lh, const char *name,
20197 dir_index d_index, unsigned int mod_time,
20198 unsigned int length)
20200 lh->add_file_name (name, d_index, mod_time, length);
20205 /* Read directory table. */
20206 while ((cur_dir = read_direct_string (abfd, line_ptr, &bytes_read)) != NULL)
20208 line_ptr += bytes_read;
20209 lh->add_include_dir (cur_dir);
20211 line_ptr += bytes_read;
20213 /* Read file name table. */
20214 while ((cur_file = read_direct_string (abfd, line_ptr, &bytes_read)) != NULL)
20216 unsigned int mod_time, length;
20219 line_ptr += bytes_read;
20220 d_index = (dir_index) read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
20221 line_ptr += bytes_read;
20222 mod_time = read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
20223 line_ptr += bytes_read;
20224 length = read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
20225 line_ptr += bytes_read;
20227 lh->add_file_name (cur_file, d_index, mod_time, length);
20229 line_ptr += bytes_read;
20231 lh->statement_program_start = line_ptr;
20233 if (line_ptr > (section->buffer + section->size))
20234 complaint (_("line number info header doesn't "
20235 "fit in `.debug_line' section"));
20240 /* Subroutine of dwarf_decode_lines to simplify it.
20241 Return the file name of the psymtab for included file FILE_INDEX
20242 in line header LH of PST.
20243 COMP_DIR is the compilation directory (DW_AT_comp_dir) or NULL if unknown.
20244 If space for the result is malloc'd, *NAME_HOLDER will be set.
20245 Returns NULL if FILE_INDEX should be ignored, i.e., it is pst->filename. */
20247 static const char *
20248 psymtab_include_file_name (const struct line_header *lh, int file_index,
20249 const struct partial_symtab *pst,
20250 const char *comp_dir,
20251 gdb::unique_xmalloc_ptr<char> *name_holder)
20253 const file_entry &fe = lh->file_names[file_index];
20254 const char *include_name = fe.name;
20255 const char *include_name_to_compare = include_name;
20256 const char *pst_filename;
20259 const char *dir_name = fe.include_dir (lh);
20261 gdb::unique_xmalloc_ptr<char> hold_compare;
20262 if (!IS_ABSOLUTE_PATH (include_name)
20263 && (dir_name != NULL || comp_dir != NULL))
20265 /* Avoid creating a duplicate psymtab for PST.
20266 We do this by comparing INCLUDE_NAME and PST_FILENAME.
20267 Before we do the comparison, however, we need to account
20268 for DIR_NAME and COMP_DIR.
20269 First prepend dir_name (if non-NULL). If we still don't
20270 have an absolute path prepend comp_dir (if non-NULL).
20271 However, the directory we record in the include-file's
20272 psymtab does not contain COMP_DIR (to match the
20273 corresponding symtab(s)).
20278 bash$ gcc -g ./hello.c
20279 include_name = "hello.c"
20281 DW_AT_comp_dir = comp_dir = "/tmp"
20282 DW_AT_name = "./hello.c"
20286 if (dir_name != NULL)
20288 name_holder->reset (concat (dir_name, SLASH_STRING,
20289 include_name, (char *) NULL));
20290 include_name = name_holder->get ();
20291 include_name_to_compare = include_name;
20293 if (!IS_ABSOLUTE_PATH (include_name) && comp_dir != NULL)
20295 hold_compare.reset (concat (comp_dir, SLASH_STRING,
20296 include_name, (char *) NULL));
20297 include_name_to_compare = hold_compare.get ();
20301 pst_filename = pst->filename;
20302 gdb::unique_xmalloc_ptr<char> copied_name;
20303 if (!IS_ABSOLUTE_PATH (pst_filename) && pst->dirname != NULL)
20305 copied_name.reset (concat (pst->dirname, SLASH_STRING,
20306 pst_filename, (char *) NULL));
20307 pst_filename = copied_name.get ();
20310 file_is_pst = FILENAME_CMP (include_name_to_compare, pst_filename) == 0;
20314 return include_name;
20317 /* State machine to track the state of the line number program. */
20319 class lnp_state_machine
20322 /* Initialize a machine state for the start of a line number
20324 lnp_state_machine (struct dwarf2_cu *cu, gdbarch *arch, line_header *lh,
20325 bool record_lines_p);
20327 file_entry *current_file ()
20329 /* lh->file_names is 0-based, but the file name numbers in the
20330 statement program are 1-based. */
20331 return m_line_header->file_name_at (m_file);
20334 /* Record the line in the state machine. END_SEQUENCE is true if
20335 we're processing the end of a sequence. */
20336 void record_line (bool end_sequence);
20338 /* Check ADDRESS is zero and less than UNRELOCATED_LOWPC and if true
20339 nop-out rest of the lines in this sequence. */
20340 void check_line_address (struct dwarf2_cu *cu,
20341 const gdb_byte *line_ptr,
20342 CORE_ADDR unrelocated_lowpc, CORE_ADDR address);
20344 void handle_set_discriminator (unsigned int discriminator)
20346 m_discriminator = discriminator;
20347 m_line_has_non_zero_discriminator |= discriminator != 0;
20350 /* Handle DW_LNE_set_address. */
20351 void handle_set_address (CORE_ADDR baseaddr, CORE_ADDR address)
20354 address += baseaddr;
20355 m_address = gdbarch_adjust_dwarf2_line (m_gdbarch, address, false);
20358 /* Handle DW_LNS_advance_pc. */
20359 void handle_advance_pc (CORE_ADDR adjust);
20361 /* Handle a special opcode. */
20362 void handle_special_opcode (unsigned char op_code);
20364 /* Handle DW_LNS_advance_line. */
20365 void handle_advance_line (int line_delta)
20367 advance_line (line_delta);
20370 /* Handle DW_LNS_set_file. */
20371 void handle_set_file (file_name_index file);
20373 /* Handle DW_LNS_negate_stmt. */
20374 void handle_negate_stmt ()
20376 m_is_stmt = !m_is_stmt;
20379 /* Handle DW_LNS_const_add_pc. */
20380 void handle_const_add_pc ();
20382 /* Handle DW_LNS_fixed_advance_pc. */
20383 void handle_fixed_advance_pc (CORE_ADDR addr_adj)
20385 m_address += gdbarch_adjust_dwarf2_line (m_gdbarch, addr_adj, true);
20389 /* Handle DW_LNS_copy. */
20390 void handle_copy ()
20392 record_line (false);
20393 m_discriminator = 0;
20396 /* Handle DW_LNE_end_sequence. */
20397 void handle_end_sequence ()
20399 m_currently_recording_lines = true;
20403 /* Advance the line by LINE_DELTA. */
20404 void advance_line (int line_delta)
20406 m_line += line_delta;
20408 if (line_delta != 0)
20409 m_line_has_non_zero_discriminator = m_discriminator != 0;
20412 struct dwarf2_cu *m_cu;
20414 gdbarch *m_gdbarch;
20416 /* True if we're recording lines.
20417 Otherwise we're building partial symtabs and are just interested in
20418 finding include files mentioned by the line number program. */
20419 bool m_record_lines_p;
20421 /* The line number header. */
20422 line_header *m_line_header;
20424 /* These are part of the standard DWARF line number state machine,
20425 and initialized according to the DWARF spec. */
20427 unsigned char m_op_index = 0;
20428 /* The line table index (1-based) of the current file. */
20429 file_name_index m_file = (file_name_index) 1;
20430 unsigned int m_line = 1;
20432 /* These are initialized in the constructor. */
20434 CORE_ADDR m_address;
20436 unsigned int m_discriminator;
20438 /* Additional bits of state we need to track. */
20440 /* The last file that we called dwarf2_start_subfile for.
20441 This is only used for TLLs. */
20442 unsigned int m_last_file = 0;
20443 /* The last file a line number was recorded for. */
20444 struct subfile *m_last_subfile = NULL;
20446 /* When true, record the lines we decode. */
20447 bool m_currently_recording_lines = false;
20449 /* The last line number that was recorded, used to coalesce
20450 consecutive entries for the same line. This can happen, for
20451 example, when discriminators are present. PR 17276. */
20452 unsigned int m_last_line = 0;
20453 bool m_line_has_non_zero_discriminator = false;
20457 lnp_state_machine::handle_advance_pc (CORE_ADDR adjust)
20459 CORE_ADDR addr_adj = (((m_op_index + adjust)
20460 / m_line_header->maximum_ops_per_instruction)
20461 * m_line_header->minimum_instruction_length);
20462 m_address += gdbarch_adjust_dwarf2_line (m_gdbarch, addr_adj, true);
20463 m_op_index = ((m_op_index + adjust)
20464 % m_line_header->maximum_ops_per_instruction);
20468 lnp_state_machine::handle_special_opcode (unsigned char op_code)
20470 unsigned char adj_opcode = op_code - m_line_header->opcode_base;
20471 CORE_ADDR addr_adj = (((m_op_index
20472 + (adj_opcode / m_line_header->line_range))
20473 / m_line_header->maximum_ops_per_instruction)
20474 * m_line_header->minimum_instruction_length);
20475 m_address += gdbarch_adjust_dwarf2_line (m_gdbarch, addr_adj, true);
20476 m_op_index = ((m_op_index + (adj_opcode / m_line_header->line_range))
20477 % m_line_header->maximum_ops_per_instruction);
20479 int line_delta = (m_line_header->line_base
20480 + (adj_opcode % m_line_header->line_range));
20481 advance_line (line_delta);
20482 record_line (false);
20483 m_discriminator = 0;
20487 lnp_state_machine::handle_set_file (file_name_index file)
20491 const file_entry *fe = current_file ();
20493 dwarf2_debug_line_missing_file_complaint ();
20494 else if (m_record_lines_p)
20496 const char *dir = fe->include_dir (m_line_header);
20498 m_last_subfile = m_cu->builder->get_current_subfile ();
20499 m_line_has_non_zero_discriminator = m_discriminator != 0;
20500 dwarf2_start_subfile (m_cu, fe->name, dir);
20505 lnp_state_machine::handle_const_add_pc ()
20508 = (255 - m_line_header->opcode_base) / m_line_header->line_range;
20511 = (((m_op_index + adjust)
20512 / m_line_header->maximum_ops_per_instruction)
20513 * m_line_header->minimum_instruction_length);
20515 m_address += gdbarch_adjust_dwarf2_line (m_gdbarch, addr_adj, true);
20516 m_op_index = ((m_op_index + adjust)
20517 % m_line_header->maximum_ops_per_instruction);
20520 /* Return non-zero if we should add LINE to the line number table.
20521 LINE is the line to add, LAST_LINE is the last line that was added,
20522 LAST_SUBFILE is the subfile for LAST_LINE.
20523 LINE_HAS_NON_ZERO_DISCRIMINATOR is non-zero if LINE has ever
20524 had a non-zero discriminator.
20526 We have to be careful in the presence of discriminators.
20527 E.g., for this line:
20529 for (i = 0; i < 100000; i++);
20531 clang can emit four line number entries for that one line,
20532 each with a different discriminator.
20533 See gdb.dwarf2/dw2-single-line-discriminators.exp for an example.
20535 However, we want gdb to coalesce all four entries into one.
20536 Otherwise the user could stepi into the middle of the line and
20537 gdb would get confused about whether the pc really was in the
20538 middle of the line.
20540 Things are further complicated by the fact that two consecutive
20541 line number entries for the same line is a heuristic used by gcc
20542 to denote the end of the prologue. So we can't just discard duplicate
20543 entries, we have to be selective about it. The heuristic we use is
20544 that we only collapse consecutive entries for the same line if at least
20545 one of those entries has a non-zero discriminator. PR 17276.
20547 Note: Addresses in the line number state machine can never go backwards
20548 within one sequence, thus this coalescing is ok. */
20551 dwarf_record_line_p (struct dwarf2_cu *cu,
20552 unsigned int line, unsigned int last_line,
20553 int line_has_non_zero_discriminator,
20554 struct subfile *last_subfile)
20556 if (cu->builder->get_current_subfile () != last_subfile)
20558 if (line != last_line)
20560 /* Same line for the same file that we've seen already.
20561 As a last check, for pr 17276, only record the line if the line
20562 has never had a non-zero discriminator. */
20563 if (!line_has_non_zero_discriminator)
20568 /* Use the CU's builder to record line number LINE beginning at
20569 address ADDRESS in the line table of subfile SUBFILE. */
20572 dwarf_record_line_1 (struct gdbarch *gdbarch, struct subfile *subfile,
20573 unsigned int line, CORE_ADDR address,
20574 struct dwarf2_cu *cu)
20576 CORE_ADDR addr = gdbarch_addr_bits_remove (gdbarch, address);
20578 if (dwarf_line_debug)
20580 fprintf_unfiltered (gdb_stdlog,
20581 "Recording line %u, file %s, address %s\n",
20582 line, lbasename (subfile->name),
20583 paddress (gdbarch, address));
20587 cu->builder->record_line (subfile, line, addr);
20590 /* Subroutine of dwarf_decode_lines_1 to simplify it.
20591 Mark the end of a set of line number records.
20592 The arguments are the same as for dwarf_record_line_1.
20593 If SUBFILE is NULL the request is ignored. */
20596 dwarf_finish_line (struct gdbarch *gdbarch, struct subfile *subfile,
20597 CORE_ADDR address, struct dwarf2_cu *cu)
20599 if (subfile == NULL)
20602 if (dwarf_line_debug)
20604 fprintf_unfiltered (gdb_stdlog,
20605 "Finishing current line, file %s, address %s\n",
20606 lbasename (subfile->name),
20607 paddress (gdbarch, address));
20610 dwarf_record_line_1 (gdbarch, subfile, 0, address, cu);
20614 lnp_state_machine::record_line (bool end_sequence)
20616 if (dwarf_line_debug)
20618 fprintf_unfiltered (gdb_stdlog,
20619 "Processing actual line %u: file %u,"
20620 " address %s, is_stmt %u, discrim %u\n",
20621 m_line, to_underlying (m_file),
20622 paddress (m_gdbarch, m_address),
20623 m_is_stmt, m_discriminator);
20626 file_entry *fe = current_file ();
20629 dwarf2_debug_line_missing_file_complaint ();
20630 /* For now we ignore lines not starting on an instruction boundary.
20631 But not when processing end_sequence for compatibility with the
20632 previous version of the code. */
20633 else if (m_op_index == 0 || end_sequence)
20635 fe->included_p = 1;
20636 if (m_record_lines_p && m_is_stmt)
20638 if (m_last_subfile != m_cu->builder->get_current_subfile ()
20641 dwarf_finish_line (m_gdbarch, m_last_subfile, m_address,
20642 m_currently_recording_lines ? m_cu : nullptr);
20647 if (dwarf_record_line_p (m_cu, m_line, m_last_line,
20648 m_line_has_non_zero_discriminator,
20651 dwarf_record_line_1 (m_gdbarch,
20652 m_cu->builder->get_current_subfile (),
20654 m_currently_recording_lines ? m_cu : nullptr);
20656 m_last_subfile = m_cu->builder->get_current_subfile ();
20657 m_last_line = m_line;
20663 lnp_state_machine::lnp_state_machine (struct dwarf2_cu *cu, gdbarch *arch,
20664 line_header *lh, bool record_lines_p)
20668 m_record_lines_p = record_lines_p;
20669 m_line_header = lh;
20671 m_currently_recording_lines = true;
20673 /* Call `gdbarch_adjust_dwarf2_line' on the initial 0 address as if there
20674 was a line entry for it so that the backend has a chance to adjust it
20675 and also record it in case it needs it. This is currently used by MIPS
20676 code, cf. `mips_adjust_dwarf2_line'. */
20677 m_address = gdbarch_adjust_dwarf2_line (arch, 0, 0);
20678 m_is_stmt = lh->default_is_stmt;
20679 m_discriminator = 0;
20683 lnp_state_machine::check_line_address (struct dwarf2_cu *cu,
20684 const gdb_byte *line_ptr,
20685 CORE_ADDR unrelocated_lowpc, CORE_ADDR address)
20687 /* If ADDRESS < UNRELOCATED_LOWPC then it's not a usable value, it's outside
20688 the pc range of the CU. However, we restrict the test to only ADDRESS
20689 values of zero to preserve GDB's previous behaviour which is to handle
20690 the specific case of a function being GC'd by the linker. */
20692 if (address == 0 && address < unrelocated_lowpc)
20694 /* This line table is for a function which has been
20695 GCd by the linker. Ignore it. PR gdb/12528 */
20697 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
20698 long line_offset = line_ptr - get_debug_line_section (cu)->buffer;
20700 complaint (_(".debug_line address at offset 0x%lx is 0 [in module %s]"),
20701 line_offset, objfile_name (objfile));
20702 m_currently_recording_lines = false;
20703 /* Note: m_currently_recording_lines is left as false until we see
20704 DW_LNE_end_sequence. */
20708 /* Subroutine of dwarf_decode_lines to simplify it.
20709 Process the line number information in LH.
20710 If DECODE_FOR_PST_P is non-zero, all we do is process the line number
20711 program in order to set included_p for every referenced header. */
20714 dwarf_decode_lines_1 (struct line_header *lh, struct dwarf2_cu *cu,
20715 const int decode_for_pst_p, CORE_ADDR lowpc)
20717 const gdb_byte *line_ptr, *extended_end;
20718 const gdb_byte *line_end;
20719 unsigned int bytes_read, extended_len;
20720 unsigned char op_code, extended_op;
20721 CORE_ADDR baseaddr;
20722 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
20723 bfd *abfd = objfile->obfd;
20724 struct gdbarch *gdbarch = get_objfile_arch (objfile);
20725 /* True if we're recording line info (as opposed to building partial
20726 symtabs and just interested in finding include files mentioned by
20727 the line number program). */
20728 bool record_lines_p = !decode_for_pst_p;
20730 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
20732 line_ptr = lh->statement_program_start;
20733 line_end = lh->statement_program_end;
20735 /* Read the statement sequences until there's nothing left. */
20736 while (line_ptr < line_end)
20738 /* The DWARF line number program state machine. Reset the state
20739 machine at the start of each sequence. */
20740 lnp_state_machine state_machine (cu, gdbarch, lh, record_lines_p);
20741 bool end_sequence = false;
20743 if (record_lines_p)
20745 /* Start a subfile for the current file of the state
20747 const file_entry *fe = state_machine.current_file ();
20750 dwarf2_start_subfile (cu, fe->name, fe->include_dir (lh));
20753 /* Decode the table. */
20754 while (line_ptr < line_end && !end_sequence)
20756 op_code = read_1_byte (abfd, line_ptr);
20759 if (op_code >= lh->opcode_base)
20761 /* Special opcode. */
20762 state_machine.handle_special_opcode (op_code);
20764 else switch (op_code)
20766 case DW_LNS_extended_op:
20767 extended_len = read_unsigned_leb128 (abfd, line_ptr,
20769 line_ptr += bytes_read;
20770 extended_end = line_ptr + extended_len;
20771 extended_op = read_1_byte (abfd, line_ptr);
20773 switch (extended_op)
20775 case DW_LNE_end_sequence:
20776 state_machine.handle_end_sequence ();
20777 end_sequence = true;
20779 case DW_LNE_set_address:
20782 = read_address (abfd, line_ptr, cu, &bytes_read);
20783 line_ptr += bytes_read;
20785 state_machine.check_line_address (cu, line_ptr,
20786 lowpc - baseaddr, address);
20787 state_machine.handle_set_address (baseaddr, address);
20790 case DW_LNE_define_file:
20792 const char *cur_file;
20793 unsigned int mod_time, length;
20796 cur_file = read_direct_string (abfd, line_ptr,
20798 line_ptr += bytes_read;
20799 dindex = (dir_index)
20800 read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
20801 line_ptr += bytes_read;
20803 read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
20804 line_ptr += bytes_read;
20806 read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
20807 line_ptr += bytes_read;
20808 lh->add_file_name (cur_file, dindex, mod_time, length);
20811 case DW_LNE_set_discriminator:
20813 /* The discriminator is not interesting to the
20814 debugger; just ignore it. We still need to
20815 check its value though:
20816 if there are consecutive entries for the same
20817 (non-prologue) line we want to coalesce them.
20820 = read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
20821 line_ptr += bytes_read;
20823 state_machine.handle_set_discriminator (discr);
20827 complaint (_("mangled .debug_line section"));
20830 /* Make sure that we parsed the extended op correctly. If e.g.
20831 we expected a different address size than the producer used,
20832 we may have read the wrong number of bytes. */
20833 if (line_ptr != extended_end)
20835 complaint (_("mangled .debug_line section"));
20840 state_machine.handle_copy ();
20842 case DW_LNS_advance_pc:
20845 = read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
20846 line_ptr += bytes_read;
20848 state_machine.handle_advance_pc (adjust);
20851 case DW_LNS_advance_line:
20854 = read_signed_leb128 (abfd, line_ptr, &bytes_read);
20855 line_ptr += bytes_read;
20857 state_machine.handle_advance_line (line_delta);
20860 case DW_LNS_set_file:
20862 file_name_index file
20863 = (file_name_index) read_unsigned_leb128 (abfd, line_ptr,
20865 line_ptr += bytes_read;
20867 state_machine.handle_set_file (file);
20870 case DW_LNS_set_column:
20871 (void) read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
20872 line_ptr += bytes_read;
20874 case DW_LNS_negate_stmt:
20875 state_machine.handle_negate_stmt ();
20877 case DW_LNS_set_basic_block:
20879 /* Add to the address register of the state machine the
20880 address increment value corresponding to special opcode
20881 255. I.e., this value is scaled by the minimum
20882 instruction length since special opcode 255 would have
20883 scaled the increment. */
20884 case DW_LNS_const_add_pc:
20885 state_machine.handle_const_add_pc ();
20887 case DW_LNS_fixed_advance_pc:
20889 CORE_ADDR addr_adj = read_2_bytes (abfd, line_ptr);
20892 state_machine.handle_fixed_advance_pc (addr_adj);
20897 /* Unknown standard opcode, ignore it. */
20900 for (i = 0; i < lh->standard_opcode_lengths[op_code]; i++)
20902 (void) read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
20903 line_ptr += bytes_read;
20910 dwarf2_debug_line_missing_end_sequence_complaint ();
20912 /* We got a DW_LNE_end_sequence (or we ran off the end of the buffer,
20913 in which case we still finish recording the last line). */
20914 state_machine.record_line (true);
20918 /* Decode the Line Number Program (LNP) for the given line_header
20919 structure and CU. The actual information extracted and the type
20920 of structures created from the LNP depends on the value of PST.
20922 1. If PST is NULL, then this procedure uses the data from the program
20923 to create all necessary symbol tables, and their linetables.
20925 2. If PST is not NULL, this procedure reads the program to determine
20926 the list of files included by the unit represented by PST, and
20927 builds all the associated partial symbol tables.
20929 COMP_DIR is the compilation directory (DW_AT_comp_dir) or NULL if unknown.
20930 It is used for relative paths in the line table.
20931 NOTE: When processing partial symtabs (pst != NULL),
20932 comp_dir == pst->dirname.
20934 NOTE: It is important that psymtabs have the same file name (via strcmp)
20935 as the corresponding symtab. Since COMP_DIR is not used in the name of the
20936 symtab we don't use it in the name of the psymtabs we create.
20937 E.g. expand_line_sal requires this when finding psymtabs to expand.
20938 A good testcase for this is mb-inline.exp.
20940 LOWPC is the lowest address in CU (or 0 if not known).
20942 Boolean DECODE_MAPPING specifies we need to fully decode .debug_line
20943 for its PC<->lines mapping information. Otherwise only the filename
20944 table is read in. */
20947 dwarf_decode_lines (struct line_header *lh, const char *comp_dir,
20948 struct dwarf2_cu *cu, struct partial_symtab *pst,
20949 CORE_ADDR lowpc, int decode_mapping)
20951 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
20952 const int decode_for_pst_p = (pst != NULL);
20954 if (decode_mapping)
20955 dwarf_decode_lines_1 (lh, cu, decode_for_pst_p, lowpc);
20957 if (decode_for_pst_p)
20961 /* Now that we're done scanning the Line Header Program, we can
20962 create the psymtab of each included file. */
20963 for (file_index = 0; file_index < lh->file_names.size (); file_index++)
20964 if (lh->file_names[file_index].included_p == 1)
20966 gdb::unique_xmalloc_ptr<char> name_holder;
20967 const char *include_name =
20968 psymtab_include_file_name (lh, file_index, pst, comp_dir,
20970 if (include_name != NULL)
20971 dwarf2_create_include_psymtab (include_name, pst, objfile);
20976 /* Make sure a symtab is created for every file, even files
20977 which contain only variables (i.e. no code with associated
20979 struct compunit_symtab *cust = cu->builder->get_compunit_symtab ();
20982 for (i = 0; i < lh->file_names.size (); i++)
20984 file_entry &fe = lh->file_names[i];
20986 dwarf2_start_subfile (cu, fe.name, fe.include_dir (lh));
20988 if (cu->builder->get_current_subfile ()->symtab == NULL)
20990 cu->builder->get_current_subfile ()->symtab
20991 = allocate_symtab (cust,
20992 cu->builder->get_current_subfile ()->name);
20994 fe.symtab = cu->builder->get_current_subfile ()->symtab;
20999 /* Start a subfile for DWARF. FILENAME is the name of the file and
21000 DIRNAME the name of the source directory which contains FILENAME
21001 or NULL if not known.
21002 This routine tries to keep line numbers from identical absolute and
21003 relative file names in a common subfile.
21005 Using the `list' example from the GDB testsuite, which resides in
21006 /srcdir and compiling it with Irix6.2 cc in /compdir using a filename
21007 of /srcdir/list0.c yields the following debugging information for list0.c:
21009 DW_AT_name: /srcdir/list0.c
21010 DW_AT_comp_dir: /compdir
21011 files.files[0].name: list0.h
21012 files.files[0].dir: /srcdir
21013 files.files[1].name: list0.c
21014 files.files[1].dir: /srcdir
21016 The line number information for list0.c has to end up in a single
21017 subfile, so that `break /srcdir/list0.c:1' works as expected.
21018 start_subfile will ensure that this happens provided that we pass the
21019 concatenation of files.files[1].dir and files.files[1].name as the
21023 dwarf2_start_subfile (struct dwarf2_cu *cu, const char *filename,
21024 const char *dirname)
21028 /* In order not to lose the line information directory,
21029 we concatenate it to the filename when it makes sense.
21030 Note that the Dwarf3 standard says (speaking of filenames in line
21031 information): ``The directory index is ignored for file names
21032 that represent full path names''. Thus ignoring dirname in the
21033 `else' branch below isn't an issue. */
21035 if (!IS_ABSOLUTE_PATH (filename) && dirname != NULL)
21037 copy = concat (dirname, SLASH_STRING, filename, (char *)NULL);
21041 cu->builder->start_subfile (filename);
21047 /* Start a symtab for DWARF. NAME, COMP_DIR, LOW_PC are passed to the
21048 buildsym_compunit constructor. */
21050 static struct compunit_symtab *
21051 dwarf2_start_symtab (struct dwarf2_cu *cu,
21052 const char *name, const char *comp_dir, CORE_ADDR low_pc)
21054 gdb_assert (cu->builder == nullptr);
21056 cu->builder.reset (new struct buildsym_compunit
21057 (cu->per_cu->dwarf2_per_objfile->objfile,
21058 name, comp_dir, cu->language, low_pc));
21060 cu->list_in_scope = cu->builder->get_file_symbols ();
21062 cu->builder->record_debugformat ("DWARF 2");
21063 cu->builder->record_producer (cu->producer);
21065 cu->processing_has_namespace_info = 0;
21067 return cu->builder->get_compunit_symtab ();
21071 var_decode_location (struct attribute *attr, struct symbol *sym,
21072 struct dwarf2_cu *cu)
21074 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
21075 struct comp_unit_head *cu_header = &cu->header;
21077 /* NOTE drow/2003-01-30: There used to be a comment and some special
21078 code here to turn a symbol with DW_AT_external and a
21079 SYMBOL_VALUE_ADDRESS of 0 into a LOC_UNRESOLVED symbol. This was
21080 necessary for platforms (maybe Alpha, certainly PowerPC GNU/Linux
21081 with some versions of binutils) where shared libraries could have
21082 relocations against symbols in their debug information - the
21083 minimal symbol would have the right address, but the debug info
21084 would not. It's no longer necessary, because we will explicitly
21085 apply relocations when we read in the debug information now. */
21087 /* A DW_AT_location attribute with no contents indicates that a
21088 variable has been optimized away. */
21089 if (attr_form_is_block (attr) && DW_BLOCK (attr)->size == 0)
21091 SYMBOL_ACLASS_INDEX (sym) = LOC_OPTIMIZED_OUT;
21095 /* Handle one degenerate form of location expression specially, to
21096 preserve GDB's previous behavior when section offsets are
21097 specified. If this is just a DW_OP_addr or DW_OP_GNU_addr_index
21098 then mark this symbol as LOC_STATIC. */
21100 if (attr_form_is_block (attr)
21101 && ((DW_BLOCK (attr)->data[0] == DW_OP_addr
21102 && DW_BLOCK (attr)->size == 1 + cu_header->addr_size)
21103 || (DW_BLOCK (attr)->data[0] == DW_OP_GNU_addr_index
21104 && (DW_BLOCK (attr)->size
21105 == 1 + leb128_size (&DW_BLOCK (attr)->data[1])))))
21107 unsigned int dummy;
21109 if (DW_BLOCK (attr)->data[0] == DW_OP_addr)
21110 SYMBOL_VALUE_ADDRESS (sym) =
21111 read_address (objfile->obfd, DW_BLOCK (attr)->data + 1, cu, &dummy);
21113 SYMBOL_VALUE_ADDRESS (sym) =
21114 read_addr_index_from_leb128 (cu, DW_BLOCK (attr)->data + 1, &dummy);
21115 SYMBOL_ACLASS_INDEX (sym) = LOC_STATIC;
21116 fixup_symbol_section (sym, objfile);
21117 SYMBOL_VALUE_ADDRESS (sym) += ANOFFSET (objfile->section_offsets,
21118 SYMBOL_SECTION (sym));
21122 /* NOTE drow/2002-01-30: It might be worthwhile to have a static
21123 expression evaluator, and use LOC_COMPUTED only when necessary
21124 (i.e. when the value of a register or memory location is
21125 referenced, or a thread-local block, etc.). Then again, it might
21126 not be worthwhile. I'm assuming that it isn't unless performance
21127 or memory numbers show me otherwise. */
21129 dwarf2_symbol_mark_computed (attr, sym, cu, 0);
21131 if (SYMBOL_COMPUTED_OPS (sym)->location_has_loclist)
21132 cu->has_loclist = 1;
21135 /* Given a pointer to a DWARF information entry, figure out if we need
21136 to make a symbol table entry for it, and if so, create a new entry
21137 and return a pointer to it.
21138 If TYPE is NULL, determine symbol type from the die, otherwise
21139 used the passed type.
21140 If SPACE is not NULL, use it to hold the new symbol. If it is
21141 NULL, allocate a new symbol on the objfile's obstack. */
21143 static struct symbol *
21144 new_symbol (struct die_info *die, struct type *type, struct dwarf2_cu *cu,
21145 struct symbol *space)
21147 struct dwarf2_per_objfile *dwarf2_per_objfile
21148 = cu->per_cu->dwarf2_per_objfile;
21149 struct objfile *objfile = dwarf2_per_objfile->objfile;
21150 struct gdbarch *gdbarch = get_objfile_arch (objfile);
21151 struct symbol *sym = NULL;
21153 struct attribute *attr = NULL;
21154 struct attribute *attr2 = NULL;
21155 CORE_ADDR baseaddr;
21156 struct pending **list_to_add = NULL;
21158 int inlined_func = (die->tag == DW_TAG_inlined_subroutine);
21160 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
21162 name = dwarf2_name (die, cu);
21165 const char *linkagename;
21166 int suppress_add = 0;
21171 sym = allocate_symbol (objfile);
21172 OBJSTAT (objfile, n_syms++);
21174 /* Cache this symbol's name and the name's demangled form (if any). */
21175 SYMBOL_SET_LANGUAGE (sym, cu->language, &objfile->objfile_obstack);
21176 linkagename = dwarf2_physname (name, die, cu);
21177 SYMBOL_SET_NAMES (sym, linkagename, strlen (linkagename), 0, objfile);
21179 /* Fortran does not have mangling standard and the mangling does differ
21180 between gfortran, iFort etc. */
21181 if (cu->language == language_fortran
21182 && symbol_get_demangled_name (&(sym->ginfo)) == NULL)
21183 symbol_set_demangled_name (&(sym->ginfo),
21184 dwarf2_full_name (name, die, cu),
21187 /* Default assumptions.
21188 Use the passed type or decode it from the die. */
21189 SYMBOL_DOMAIN (sym) = VAR_DOMAIN;
21190 SYMBOL_ACLASS_INDEX (sym) = LOC_OPTIMIZED_OUT;
21192 SYMBOL_TYPE (sym) = type;
21194 SYMBOL_TYPE (sym) = die_type (die, cu);
21195 attr = dwarf2_attr (die,
21196 inlined_func ? DW_AT_call_line : DW_AT_decl_line,
21200 SYMBOL_LINE (sym) = DW_UNSND (attr);
21203 attr = dwarf2_attr (die,
21204 inlined_func ? DW_AT_call_file : DW_AT_decl_file,
21208 file_name_index file_index = (file_name_index) DW_UNSND (attr);
21209 struct file_entry *fe;
21211 if (cu->line_header != NULL)
21212 fe = cu->line_header->file_name_at (file_index);
21217 complaint (_("file index out of range"));
21219 symbol_set_symtab (sym, fe->symtab);
21225 attr = dwarf2_attr (die, DW_AT_low_pc, cu);
21230 addr = attr_value_as_address (attr);
21231 addr = gdbarch_adjust_dwarf2_addr (gdbarch, addr + baseaddr);
21232 SYMBOL_VALUE_ADDRESS (sym) = addr;
21234 SYMBOL_TYPE (sym) = objfile_type (objfile)->builtin_core_addr;
21235 SYMBOL_DOMAIN (sym) = LABEL_DOMAIN;
21236 SYMBOL_ACLASS_INDEX (sym) = LOC_LABEL;
21237 dw2_add_symbol_to_list (sym, cu->list_in_scope);
21239 case DW_TAG_subprogram:
21240 /* SYMBOL_BLOCK_VALUE (sym) will be filled in later by
21242 SYMBOL_ACLASS_INDEX (sym) = LOC_BLOCK;
21243 attr2 = dwarf2_attr (die, DW_AT_external, cu);
21244 if ((attr2 && (DW_UNSND (attr2) != 0))
21245 || cu->language == language_ada)
21247 /* Subprograms marked external are stored as a global symbol.
21248 Ada subprograms, whether marked external or not, are always
21249 stored as a global symbol, because we want to be able to
21250 access them globally. For instance, we want to be able
21251 to break on a nested subprogram without having to
21252 specify the context. */
21253 list_to_add = cu->builder->get_global_symbols ();
21257 list_to_add = cu->list_in_scope;
21260 case DW_TAG_inlined_subroutine:
21261 /* SYMBOL_BLOCK_VALUE (sym) will be filled in later by
21263 SYMBOL_ACLASS_INDEX (sym) = LOC_BLOCK;
21264 SYMBOL_INLINED (sym) = 1;
21265 list_to_add = cu->list_in_scope;
21267 case DW_TAG_template_value_param:
21269 /* Fall through. */
21270 case DW_TAG_constant:
21271 case DW_TAG_variable:
21272 case DW_TAG_member:
21273 /* Compilation with minimal debug info may result in
21274 variables with missing type entries. Change the
21275 misleading `void' type to something sensible. */
21276 if (TYPE_CODE (SYMBOL_TYPE (sym)) == TYPE_CODE_VOID)
21277 SYMBOL_TYPE (sym) = objfile_type (objfile)->builtin_int;
21279 attr = dwarf2_attr (die, DW_AT_const_value, cu);
21280 /* In the case of DW_TAG_member, we should only be called for
21281 static const members. */
21282 if (die->tag == DW_TAG_member)
21284 /* dwarf2_add_field uses die_is_declaration,
21285 so we do the same. */
21286 gdb_assert (die_is_declaration (die, cu));
21291 dwarf2_const_value (attr, sym, cu);
21292 attr2 = dwarf2_attr (die, DW_AT_external, cu);
21295 if (attr2 && (DW_UNSND (attr2) != 0))
21296 list_to_add = cu->builder->get_global_symbols ();
21298 list_to_add = cu->list_in_scope;
21302 attr = dwarf2_attr (die, DW_AT_location, cu);
21305 var_decode_location (attr, sym, cu);
21306 attr2 = dwarf2_attr (die, DW_AT_external, cu);
21308 /* Fortran explicitly imports any global symbols to the local
21309 scope by DW_TAG_common_block. */
21310 if (cu->language == language_fortran && die->parent
21311 && die->parent->tag == DW_TAG_common_block)
21314 if (SYMBOL_CLASS (sym) == LOC_STATIC
21315 && SYMBOL_VALUE_ADDRESS (sym) == 0
21316 && !dwarf2_per_objfile->has_section_at_zero)
21318 /* When a static variable is eliminated by the linker,
21319 the corresponding debug information is not stripped
21320 out, but the variable address is set to null;
21321 do not add such variables into symbol table. */
21323 else if (attr2 && (DW_UNSND (attr2) != 0))
21325 /* Workaround gfortran PR debug/40040 - it uses
21326 DW_AT_location for variables in -fPIC libraries which may
21327 get overriden by other libraries/executable and get
21328 a different address. Resolve it by the minimal symbol
21329 which may come from inferior's executable using copy
21330 relocation. Make this workaround only for gfortran as for
21331 other compilers GDB cannot guess the minimal symbol
21332 Fortran mangling kind. */
21333 if (cu->language == language_fortran && die->parent
21334 && die->parent->tag == DW_TAG_module
21336 && startswith (cu->producer, "GNU Fortran"))
21337 SYMBOL_ACLASS_INDEX (sym) = LOC_UNRESOLVED;
21339 /* A variable with DW_AT_external is never static,
21340 but it may be block-scoped. */
21342 = (cu->list_in_scope == cu->builder->get_file_symbols ()
21343 ? cu->builder->get_global_symbols ()
21344 : cu->list_in_scope);
21347 list_to_add = cu->list_in_scope;
21351 /* We do not know the address of this symbol.
21352 If it is an external symbol and we have type information
21353 for it, enter the symbol as a LOC_UNRESOLVED symbol.
21354 The address of the variable will then be determined from
21355 the minimal symbol table whenever the variable is
21357 attr2 = dwarf2_attr (die, DW_AT_external, cu);
21359 /* Fortran explicitly imports any global symbols to the local
21360 scope by DW_TAG_common_block. */
21361 if (cu->language == language_fortran && die->parent
21362 && die->parent->tag == DW_TAG_common_block)
21364 /* SYMBOL_CLASS doesn't matter here because
21365 read_common_block is going to reset it. */
21367 list_to_add = cu->list_in_scope;
21369 else if (attr2 && (DW_UNSND (attr2) != 0)
21370 && dwarf2_attr (die, DW_AT_type, cu) != NULL)
21372 /* A variable with DW_AT_external is never static, but it
21373 may be block-scoped. */
21375 = (cu->list_in_scope == cu->builder->get_file_symbols ()
21376 ? cu->builder->get_global_symbols ()
21377 : cu->list_in_scope);
21379 SYMBOL_ACLASS_INDEX (sym) = LOC_UNRESOLVED;
21381 else if (!die_is_declaration (die, cu))
21383 /* Use the default LOC_OPTIMIZED_OUT class. */
21384 gdb_assert (SYMBOL_CLASS (sym) == LOC_OPTIMIZED_OUT);
21386 list_to_add = cu->list_in_scope;
21390 case DW_TAG_formal_parameter:
21392 /* If we are inside a function, mark this as an argument. If
21393 not, we might be looking at an argument to an inlined function
21394 when we do not have enough information to show inlined frames;
21395 pretend it's a local variable in that case so that the user can
21397 struct context_stack *curr
21398 = cu->builder->get_current_context_stack ();
21399 if (curr != nullptr && curr->name != nullptr)
21400 SYMBOL_IS_ARGUMENT (sym) = 1;
21401 attr = dwarf2_attr (die, DW_AT_location, cu);
21404 var_decode_location (attr, sym, cu);
21406 attr = dwarf2_attr (die, DW_AT_const_value, cu);
21409 dwarf2_const_value (attr, sym, cu);
21412 list_to_add = cu->list_in_scope;
21415 case DW_TAG_unspecified_parameters:
21416 /* From varargs functions; gdb doesn't seem to have any
21417 interest in this information, so just ignore it for now.
21420 case DW_TAG_template_type_param:
21422 /* Fall through. */
21423 case DW_TAG_class_type:
21424 case DW_TAG_interface_type:
21425 case DW_TAG_structure_type:
21426 case DW_TAG_union_type:
21427 case DW_TAG_set_type:
21428 case DW_TAG_enumeration_type:
21429 SYMBOL_ACLASS_INDEX (sym) = LOC_TYPEDEF;
21430 SYMBOL_DOMAIN (sym) = STRUCT_DOMAIN;
21433 /* NOTE: carlton/2003-11-10: C++ class symbols shouldn't
21434 really ever be static objects: otherwise, if you try
21435 to, say, break of a class's method and you're in a file
21436 which doesn't mention that class, it won't work unless
21437 the check for all static symbols in lookup_symbol_aux
21438 saves you. See the OtherFileClass tests in
21439 gdb.c++/namespace.exp. */
21444 = (cu->list_in_scope == cu->builder->get_file_symbols ()
21445 && cu->language == language_cplus
21446 ? cu->builder->get_global_symbols ()
21447 : cu->list_in_scope);
21449 /* The semantics of C++ state that "struct foo {
21450 ... }" also defines a typedef for "foo". */
21451 if (cu->language == language_cplus
21452 || cu->language == language_ada
21453 || cu->language == language_d
21454 || cu->language == language_rust)
21456 /* The symbol's name is already allocated along
21457 with this objfile, so we don't need to
21458 duplicate it for the type. */
21459 if (TYPE_NAME (SYMBOL_TYPE (sym)) == 0)
21460 TYPE_NAME (SYMBOL_TYPE (sym)) = SYMBOL_SEARCH_NAME (sym);
21465 case DW_TAG_typedef:
21466 SYMBOL_ACLASS_INDEX (sym) = LOC_TYPEDEF;
21467 SYMBOL_DOMAIN (sym) = VAR_DOMAIN;
21468 list_to_add = cu->list_in_scope;
21470 case DW_TAG_base_type:
21471 case DW_TAG_subrange_type:
21472 SYMBOL_ACLASS_INDEX (sym) = LOC_TYPEDEF;
21473 SYMBOL_DOMAIN (sym) = VAR_DOMAIN;
21474 list_to_add = cu->list_in_scope;
21476 case DW_TAG_enumerator:
21477 attr = dwarf2_attr (die, DW_AT_const_value, cu);
21480 dwarf2_const_value (attr, sym, cu);
21483 /* NOTE: carlton/2003-11-10: See comment above in the
21484 DW_TAG_class_type, etc. block. */
21487 = (cu->list_in_scope == cu->builder->get_file_symbols ()
21488 && cu->language == language_cplus
21489 ? cu->builder->get_global_symbols ()
21490 : cu->list_in_scope);
21493 case DW_TAG_imported_declaration:
21494 case DW_TAG_namespace:
21495 SYMBOL_ACLASS_INDEX (sym) = LOC_TYPEDEF;
21496 list_to_add = cu->builder->get_global_symbols ();
21498 case DW_TAG_module:
21499 SYMBOL_ACLASS_INDEX (sym) = LOC_TYPEDEF;
21500 SYMBOL_DOMAIN (sym) = MODULE_DOMAIN;
21501 list_to_add = cu->builder->get_global_symbols ();
21503 case DW_TAG_common_block:
21504 SYMBOL_ACLASS_INDEX (sym) = LOC_COMMON_BLOCK;
21505 SYMBOL_DOMAIN (sym) = COMMON_BLOCK_DOMAIN;
21506 dw2_add_symbol_to_list (sym, cu->list_in_scope);
21509 /* Not a tag we recognize. Hopefully we aren't processing
21510 trash data, but since we must specifically ignore things
21511 we don't recognize, there is nothing else we should do at
21513 complaint (_("unsupported tag: '%s'"),
21514 dwarf_tag_name (die->tag));
21520 sym->hash_next = objfile->template_symbols;
21521 objfile->template_symbols = sym;
21522 list_to_add = NULL;
21525 if (list_to_add != NULL)
21526 dw2_add_symbol_to_list (sym, list_to_add);
21528 /* For the benefit of old versions of GCC, check for anonymous
21529 namespaces based on the demangled name. */
21530 if (!cu->processing_has_namespace_info
21531 && cu->language == language_cplus)
21532 cp_scan_for_anonymous_namespaces (cu->builder.get (), sym, objfile);
21537 /* Given an attr with a DW_FORM_dataN value in host byte order,
21538 zero-extend it as appropriate for the symbol's type. The DWARF
21539 standard (v4) is not entirely clear about the meaning of using
21540 DW_FORM_dataN for a constant with a signed type, where the type is
21541 wider than the data. The conclusion of a discussion on the DWARF
21542 list was that this is unspecified. We choose to always zero-extend
21543 because that is the interpretation long in use by GCC. */
21546 dwarf2_const_value_data (const struct attribute *attr, struct obstack *obstack,
21547 struct dwarf2_cu *cu, LONGEST *value, int bits)
21549 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
21550 enum bfd_endian byte_order = bfd_big_endian (objfile->obfd) ?
21551 BFD_ENDIAN_BIG : BFD_ENDIAN_LITTLE;
21552 LONGEST l = DW_UNSND (attr);
21554 if (bits < sizeof (*value) * 8)
21556 l &= ((LONGEST) 1 << bits) - 1;
21559 else if (bits == sizeof (*value) * 8)
21563 gdb_byte *bytes = (gdb_byte *) obstack_alloc (obstack, bits / 8);
21564 store_unsigned_integer (bytes, bits / 8, byte_order, l);
21571 /* Read a constant value from an attribute. Either set *VALUE, or if
21572 the value does not fit in *VALUE, set *BYTES - either already
21573 allocated on the objfile obstack, or newly allocated on OBSTACK,
21574 or, set *BATON, if we translated the constant to a location
21578 dwarf2_const_value_attr (const struct attribute *attr, struct type *type,
21579 const char *name, struct obstack *obstack,
21580 struct dwarf2_cu *cu,
21581 LONGEST *value, const gdb_byte **bytes,
21582 struct dwarf2_locexpr_baton **baton)
21584 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
21585 struct comp_unit_head *cu_header = &cu->header;
21586 struct dwarf_block *blk;
21587 enum bfd_endian byte_order = (bfd_big_endian (objfile->obfd) ?
21588 BFD_ENDIAN_BIG : BFD_ENDIAN_LITTLE);
21594 switch (attr->form)
21597 case DW_FORM_GNU_addr_index:
21601 if (TYPE_LENGTH (type) != cu_header->addr_size)
21602 dwarf2_const_value_length_mismatch_complaint (name,
21603 cu_header->addr_size,
21604 TYPE_LENGTH (type));
21605 /* Symbols of this form are reasonably rare, so we just
21606 piggyback on the existing location code rather than writing
21607 a new implementation of symbol_computed_ops. */
21608 *baton = XOBNEW (obstack, struct dwarf2_locexpr_baton);
21609 (*baton)->per_cu = cu->per_cu;
21610 gdb_assert ((*baton)->per_cu);
21612 (*baton)->size = 2 + cu_header->addr_size;
21613 data = (gdb_byte *) obstack_alloc (obstack, (*baton)->size);
21614 (*baton)->data = data;
21616 data[0] = DW_OP_addr;
21617 store_unsigned_integer (&data[1], cu_header->addr_size,
21618 byte_order, DW_ADDR (attr));
21619 data[cu_header->addr_size + 1] = DW_OP_stack_value;
21622 case DW_FORM_string:
21624 case DW_FORM_GNU_str_index:
21625 case DW_FORM_GNU_strp_alt:
21626 /* DW_STRING is already allocated on the objfile obstack, point
21628 *bytes = (const gdb_byte *) DW_STRING (attr);
21630 case DW_FORM_block1:
21631 case DW_FORM_block2:
21632 case DW_FORM_block4:
21633 case DW_FORM_block:
21634 case DW_FORM_exprloc:
21635 case DW_FORM_data16:
21636 blk = DW_BLOCK (attr);
21637 if (TYPE_LENGTH (type) != blk->size)
21638 dwarf2_const_value_length_mismatch_complaint (name, blk->size,
21639 TYPE_LENGTH (type));
21640 *bytes = blk->data;
21643 /* The DW_AT_const_value attributes are supposed to carry the
21644 symbol's value "represented as it would be on the target
21645 architecture." By the time we get here, it's already been
21646 converted to host endianness, so we just need to sign- or
21647 zero-extend it as appropriate. */
21648 case DW_FORM_data1:
21649 *bytes = dwarf2_const_value_data (attr, obstack, cu, value, 8);
21651 case DW_FORM_data2:
21652 *bytes = dwarf2_const_value_data (attr, obstack, cu, value, 16);
21654 case DW_FORM_data4:
21655 *bytes = dwarf2_const_value_data (attr, obstack, cu, value, 32);
21657 case DW_FORM_data8:
21658 *bytes = dwarf2_const_value_data (attr, obstack, cu, value, 64);
21661 case DW_FORM_sdata:
21662 case DW_FORM_implicit_const:
21663 *value = DW_SND (attr);
21666 case DW_FORM_udata:
21667 *value = DW_UNSND (attr);
21671 complaint (_("unsupported const value attribute form: '%s'"),
21672 dwarf_form_name (attr->form));
21679 /* Copy constant value from an attribute to a symbol. */
21682 dwarf2_const_value (const struct attribute *attr, struct symbol *sym,
21683 struct dwarf2_cu *cu)
21685 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
21687 const gdb_byte *bytes;
21688 struct dwarf2_locexpr_baton *baton;
21690 dwarf2_const_value_attr (attr, SYMBOL_TYPE (sym),
21691 SYMBOL_PRINT_NAME (sym),
21692 &objfile->objfile_obstack, cu,
21693 &value, &bytes, &baton);
21697 SYMBOL_LOCATION_BATON (sym) = baton;
21698 SYMBOL_ACLASS_INDEX (sym) = dwarf2_locexpr_index;
21700 else if (bytes != NULL)
21702 SYMBOL_VALUE_BYTES (sym) = bytes;
21703 SYMBOL_ACLASS_INDEX (sym) = LOC_CONST_BYTES;
21707 SYMBOL_VALUE (sym) = value;
21708 SYMBOL_ACLASS_INDEX (sym) = LOC_CONST;
21712 /* Return the type of the die in question using its DW_AT_type attribute. */
21714 static struct type *
21715 die_type (struct die_info *die, struct dwarf2_cu *cu)
21717 struct attribute *type_attr;
21719 type_attr = dwarf2_attr (die, DW_AT_type, cu);
21722 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
21723 /* A missing DW_AT_type represents a void type. */
21724 return objfile_type (objfile)->builtin_void;
21727 return lookup_die_type (die, type_attr, cu);
21730 /* True iff CU's producer generates GNAT Ada auxiliary information
21731 that allows to find parallel types through that information instead
21732 of having to do expensive parallel lookups by type name. */
21735 need_gnat_info (struct dwarf2_cu *cu)
21737 /* Assume that the Ada compiler was GNAT, which always produces
21738 the auxiliary information. */
21739 return (cu->language == language_ada);
21742 /* Return the auxiliary type of the die in question using its
21743 DW_AT_GNAT_descriptive_type attribute. Returns NULL if the
21744 attribute is not present. */
21746 static struct type *
21747 die_descriptive_type (struct die_info *die, struct dwarf2_cu *cu)
21749 struct attribute *type_attr;
21751 type_attr = dwarf2_attr (die, DW_AT_GNAT_descriptive_type, cu);
21755 return lookup_die_type (die, type_attr, cu);
21758 /* If DIE has a descriptive_type attribute, then set the TYPE's
21759 descriptive type accordingly. */
21762 set_descriptive_type (struct type *type, struct die_info *die,
21763 struct dwarf2_cu *cu)
21765 struct type *descriptive_type = die_descriptive_type (die, cu);
21767 if (descriptive_type)
21769 ALLOCATE_GNAT_AUX_TYPE (type);
21770 TYPE_DESCRIPTIVE_TYPE (type) = descriptive_type;
21774 /* Return the containing type of the die in question using its
21775 DW_AT_containing_type attribute. */
21777 static struct type *
21778 die_containing_type (struct die_info *die, struct dwarf2_cu *cu)
21780 struct attribute *type_attr;
21781 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
21783 type_attr = dwarf2_attr (die, DW_AT_containing_type, cu);
21785 error (_("Dwarf Error: Problem turning containing type into gdb type "
21786 "[in module %s]"), objfile_name (objfile));
21788 return lookup_die_type (die, type_attr, cu);
21791 /* Return an error marker type to use for the ill formed type in DIE/CU. */
21793 static struct type *
21794 build_error_marker_type (struct dwarf2_cu *cu, struct die_info *die)
21796 struct dwarf2_per_objfile *dwarf2_per_objfile
21797 = cu->per_cu->dwarf2_per_objfile;
21798 struct objfile *objfile = dwarf2_per_objfile->objfile;
21799 char *message, *saved;
21801 message = xstrprintf (_("<unknown type in %s, CU %s, DIE %s>"),
21802 objfile_name (objfile),
21803 sect_offset_str (cu->header.sect_off),
21804 sect_offset_str (die->sect_off));
21805 saved = (char *) obstack_copy0 (&objfile->objfile_obstack,
21806 message, strlen (message));
21809 return init_type (objfile, TYPE_CODE_ERROR, 0, saved);
21812 /* Look up the type of DIE in CU using its type attribute ATTR.
21813 ATTR must be one of: DW_AT_type, DW_AT_GNAT_descriptive_type,
21814 DW_AT_containing_type.
21815 If there is no type substitute an error marker. */
21817 static struct type *
21818 lookup_die_type (struct die_info *die, const struct attribute *attr,
21819 struct dwarf2_cu *cu)
21821 struct dwarf2_per_objfile *dwarf2_per_objfile
21822 = cu->per_cu->dwarf2_per_objfile;
21823 struct objfile *objfile = dwarf2_per_objfile->objfile;
21824 struct type *this_type;
21826 gdb_assert (attr->name == DW_AT_type
21827 || attr->name == DW_AT_GNAT_descriptive_type
21828 || attr->name == DW_AT_containing_type);
21830 /* First see if we have it cached. */
21832 if (attr->form == DW_FORM_GNU_ref_alt)
21834 struct dwarf2_per_cu_data *per_cu;
21835 sect_offset sect_off = dwarf2_get_ref_die_offset (attr);
21837 per_cu = dwarf2_find_containing_comp_unit (sect_off, 1,
21838 dwarf2_per_objfile);
21839 this_type = get_die_type_at_offset (sect_off, per_cu);
21841 else if (attr_form_is_ref (attr))
21843 sect_offset sect_off = dwarf2_get_ref_die_offset (attr);
21845 this_type = get_die_type_at_offset (sect_off, cu->per_cu);
21847 else if (attr->form == DW_FORM_ref_sig8)
21849 ULONGEST signature = DW_SIGNATURE (attr);
21851 return get_signatured_type (die, signature, cu);
21855 complaint (_("Dwarf Error: Bad type attribute %s in DIE"
21856 " at %s [in module %s]"),
21857 dwarf_attr_name (attr->name), sect_offset_str (die->sect_off),
21858 objfile_name (objfile));
21859 return build_error_marker_type (cu, die);
21862 /* If not cached we need to read it in. */
21864 if (this_type == NULL)
21866 struct die_info *type_die = NULL;
21867 struct dwarf2_cu *type_cu = cu;
21869 if (attr_form_is_ref (attr))
21870 type_die = follow_die_ref (die, attr, &type_cu);
21871 if (type_die == NULL)
21872 return build_error_marker_type (cu, die);
21873 /* If we find the type now, it's probably because the type came
21874 from an inter-CU reference and the type's CU got expanded before
21876 this_type = read_type_die (type_die, type_cu);
21879 /* If we still don't have a type use an error marker. */
21881 if (this_type == NULL)
21882 return build_error_marker_type (cu, die);
21887 /* Return the type in DIE, CU.
21888 Returns NULL for invalid types.
21890 This first does a lookup in die_type_hash,
21891 and only reads the die in if necessary.
21893 NOTE: This can be called when reading in partial or full symbols. */
21895 static struct type *
21896 read_type_die (struct die_info *die, struct dwarf2_cu *cu)
21898 struct type *this_type;
21900 this_type = get_die_type (die, cu);
21904 return read_type_die_1 (die, cu);
21907 /* Read the type in DIE, CU.
21908 Returns NULL for invalid types. */
21910 static struct type *
21911 read_type_die_1 (struct die_info *die, struct dwarf2_cu *cu)
21913 struct type *this_type = NULL;
21917 case DW_TAG_class_type:
21918 case DW_TAG_interface_type:
21919 case DW_TAG_structure_type:
21920 case DW_TAG_union_type:
21921 this_type = read_structure_type (die, cu);
21923 case DW_TAG_enumeration_type:
21924 this_type = read_enumeration_type (die, cu);
21926 case DW_TAG_subprogram:
21927 case DW_TAG_subroutine_type:
21928 case DW_TAG_inlined_subroutine:
21929 this_type = read_subroutine_type (die, cu);
21931 case DW_TAG_array_type:
21932 this_type = read_array_type (die, cu);
21934 case DW_TAG_set_type:
21935 this_type = read_set_type (die, cu);
21937 case DW_TAG_pointer_type:
21938 this_type = read_tag_pointer_type (die, cu);
21940 case DW_TAG_ptr_to_member_type:
21941 this_type = read_tag_ptr_to_member_type (die, cu);
21943 case DW_TAG_reference_type:
21944 this_type = read_tag_reference_type (die, cu, TYPE_CODE_REF);
21946 case DW_TAG_rvalue_reference_type:
21947 this_type = read_tag_reference_type (die, cu, TYPE_CODE_RVALUE_REF);
21949 case DW_TAG_const_type:
21950 this_type = read_tag_const_type (die, cu);
21952 case DW_TAG_volatile_type:
21953 this_type = read_tag_volatile_type (die, cu);
21955 case DW_TAG_restrict_type:
21956 this_type = read_tag_restrict_type (die, cu);
21958 case DW_TAG_string_type:
21959 this_type = read_tag_string_type (die, cu);
21961 case DW_TAG_typedef:
21962 this_type = read_typedef (die, cu);
21964 case DW_TAG_subrange_type:
21965 this_type = read_subrange_type (die, cu);
21967 case DW_TAG_base_type:
21968 this_type = read_base_type (die, cu);
21970 case DW_TAG_unspecified_type:
21971 this_type = read_unspecified_type (die, cu);
21973 case DW_TAG_namespace:
21974 this_type = read_namespace_type (die, cu);
21976 case DW_TAG_module:
21977 this_type = read_module_type (die, cu);
21979 case DW_TAG_atomic_type:
21980 this_type = read_tag_atomic_type (die, cu);
21983 complaint (_("unexpected tag in read_type_die: '%s'"),
21984 dwarf_tag_name (die->tag));
21991 /* See if we can figure out if the class lives in a namespace. We do
21992 this by looking for a member function; its demangled name will
21993 contain namespace info, if there is any.
21994 Return the computed name or NULL.
21995 Space for the result is allocated on the objfile's obstack.
21996 This is the full-die version of guess_partial_die_structure_name.
21997 In this case we know DIE has no useful parent. */
22000 guess_full_die_structure_name (struct die_info *die, struct dwarf2_cu *cu)
22002 struct die_info *spec_die;
22003 struct dwarf2_cu *spec_cu;
22004 struct die_info *child;
22005 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
22008 spec_die = die_specification (die, &spec_cu);
22009 if (spec_die != NULL)
22015 for (child = die->child;
22017 child = child->sibling)
22019 if (child->tag == DW_TAG_subprogram)
22021 const char *linkage_name = dw2_linkage_name (child, cu);
22023 if (linkage_name != NULL)
22026 = language_class_name_from_physname (cu->language_defn,
22030 if (actual_name != NULL)
22032 const char *die_name = dwarf2_name (die, cu);
22034 if (die_name != NULL
22035 && strcmp (die_name, actual_name) != 0)
22037 /* Strip off the class name from the full name.
22038 We want the prefix. */
22039 int die_name_len = strlen (die_name);
22040 int actual_name_len = strlen (actual_name);
22042 /* Test for '::' as a sanity check. */
22043 if (actual_name_len > die_name_len + 2
22044 && actual_name[actual_name_len
22045 - die_name_len - 1] == ':')
22046 name = (char *) obstack_copy0 (
22047 &objfile->per_bfd->storage_obstack,
22048 actual_name, actual_name_len - die_name_len - 2);
22051 xfree (actual_name);
22060 /* GCC might emit a nameless typedef that has a linkage name. Determine the
22061 prefix part in such case. See
22062 http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47510. */
22064 static const char *
22065 anonymous_struct_prefix (struct die_info *die, struct dwarf2_cu *cu)
22067 struct attribute *attr;
22070 if (die->tag != DW_TAG_class_type && die->tag != DW_TAG_interface_type
22071 && die->tag != DW_TAG_structure_type && die->tag != DW_TAG_union_type)
22074 if (dwarf2_string_attr (die, DW_AT_name, cu) != NULL)
22077 attr = dw2_linkage_name_attr (die, cu);
22078 if (attr == NULL || DW_STRING (attr) == NULL)
22081 /* dwarf2_name had to be already called. */
22082 gdb_assert (DW_STRING_IS_CANONICAL (attr));
22084 /* Strip the base name, keep any leading namespaces/classes. */
22085 base = strrchr (DW_STRING (attr), ':');
22086 if (base == NULL || base == DW_STRING (attr) || base[-1] != ':')
22089 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
22090 return (char *) obstack_copy0 (&objfile->per_bfd->storage_obstack,
22092 &base[-1] - DW_STRING (attr));
22095 /* Return the name of the namespace/class that DIE is defined within,
22096 or "" if we can't tell. The caller should not xfree the result.
22098 For example, if we're within the method foo() in the following
22108 then determine_prefix on foo's die will return "N::C". */
22110 static const char *
22111 determine_prefix (struct die_info *die, struct dwarf2_cu *cu)
22113 struct dwarf2_per_objfile *dwarf2_per_objfile
22114 = cu->per_cu->dwarf2_per_objfile;
22115 struct die_info *parent, *spec_die;
22116 struct dwarf2_cu *spec_cu;
22117 struct type *parent_type;
22118 const char *retval;
22120 if (cu->language != language_cplus
22121 && cu->language != language_fortran && cu->language != language_d
22122 && cu->language != language_rust)
22125 retval = anonymous_struct_prefix (die, cu);
22129 /* We have to be careful in the presence of DW_AT_specification.
22130 For example, with GCC 3.4, given the code
22134 // Definition of N::foo.
22138 then we'll have a tree of DIEs like this:
22140 1: DW_TAG_compile_unit
22141 2: DW_TAG_namespace // N
22142 3: DW_TAG_subprogram // declaration of N::foo
22143 4: DW_TAG_subprogram // definition of N::foo
22144 DW_AT_specification // refers to die #3
22146 Thus, when processing die #4, we have to pretend that we're in
22147 the context of its DW_AT_specification, namely the contex of die
22150 spec_die = die_specification (die, &spec_cu);
22151 if (spec_die == NULL)
22152 parent = die->parent;
22155 parent = spec_die->parent;
22159 if (parent == NULL)
22161 else if (parent->building_fullname)
22164 const char *parent_name;
22166 /* It has been seen on RealView 2.2 built binaries,
22167 DW_TAG_template_type_param types actually _defined_ as
22168 children of the parent class:
22171 template class <class Enum> Class{};
22172 Class<enum E> class_e;
22174 1: DW_TAG_class_type (Class)
22175 2: DW_TAG_enumeration_type (E)
22176 3: DW_TAG_enumerator (enum1:0)
22177 3: DW_TAG_enumerator (enum2:1)
22179 2: DW_TAG_template_type_param
22180 DW_AT_type DW_FORM_ref_udata (E)
22182 Besides being broken debug info, it can put GDB into an
22183 infinite loop. Consider:
22185 When we're building the full name for Class<E>, we'll start
22186 at Class, and go look over its template type parameters,
22187 finding E. We'll then try to build the full name of E, and
22188 reach here. We're now trying to build the full name of E,
22189 and look over the parent DIE for containing scope. In the
22190 broken case, if we followed the parent DIE of E, we'd again
22191 find Class, and once again go look at its template type
22192 arguments, etc., etc. Simply don't consider such parent die
22193 as source-level parent of this die (it can't be, the language
22194 doesn't allow it), and break the loop here. */
22195 name = dwarf2_name (die, cu);
22196 parent_name = dwarf2_name (parent, cu);
22197 complaint (_("template param type '%s' defined within parent '%s'"),
22198 name ? name : "<unknown>",
22199 parent_name ? parent_name : "<unknown>");
22203 switch (parent->tag)
22205 case DW_TAG_namespace:
22206 parent_type = read_type_die (parent, cu);
22207 /* GCC 4.0 and 4.1 had a bug (PR c++/28460) where they generated bogus
22208 DW_TAG_namespace DIEs with a name of "::" for the global namespace.
22209 Work around this problem here. */
22210 if (cu->language == language_cplus
22211 && strcmp (TYPE_NAME (parent_type), "::") == 0)
22213 /* We give a name to even anonymous namespaces. */
22214 return TYPE_NAME (parent_type);
22215 case DW_TAG_class_type:
22216 case DW_TAG_interface_type:
22217 case DW_TAG_structure_type:
22218 case DW_TAG_union_type:
22219 case DW_TAG_module:
22220 parent_type = read_type_die (parent, cu);
22221 if (TYPE_NAME (parent_type) != NULL)
22222 return TYPE_NAME (parent_type);
22224 /* An anonymous structure is only allowed non-static data
22225 members; no typedefs, no member functions, et cetera.
22226 So it does not need a prefix. */
22228 case DW_TAG_compile_unit:
22229 case DW_TAG_partial_unit:
22230 /* gcc-4.5 -gdwarf-4 can drop the enclosing namespace. Cope. */
22231 if (cu->language == language_cplus
22232 && !VEC_empty (dwarf2_section_info_def, dwarf2_per_objfile->types)
22233 && die->child != NULL
22234 && (die->tag == DW_TAG_class_type
22235 || die->tag == DW_TAG_structure_type
22236 || die->tag == DW_TAG_union_type))
22238 char *name = guess_full_die_structure_name (die, cu);
22243 case DW_TAG_enumeration_type:
22244 parent_type = read_type_die (parent, cu);
22245 if (TYPE_DECLARED_CLASS (parent_type))
22247 if (TYPE_NAME (parent_type) != NULL)
22248 return TYPE_NAME (parent_type);
22251 /* Fall through. */
22253 return determine_prefix (parent, cu);
22257 /* Return a newly-allocated string formed by concatenating PREFIX and SUFFIX
22258 with appropriate separator. If PREFIX or SUFFIX is NULL or empty, then
22259 simply copy the SUFFIX or PREFIX, respectively. If OBS is non-null, perform
22260 an obconcat, otherwise allocate storage for the result. The CU argument is
22261 used to determine the language and hence, the appropriate separator. */
22263 #define MAX_SEP_LEN 7 /* strlen ("__") + strlen ("_MOD_") */
22266 typename_concat (struct obstack *obs, const char *prefix, const char *suffix,
22267 int physname, struct dwarf2_cu *cu)
22269 const char *lead = "";
22272 if (suffix == NULL || suffix[0] == '\0'
22273 || prefix == NULL || prefix[0] == '\0')
22275 else if (cu->language == language_d)
22277 /* For D, the 'main' function could be defined in any module, but it
22278 should never be prefixed. */
22279 if (strcmp (suffix, "D main") == 0)
22287 else if (cu->language == language_fortran && physname)
22289 /* This is gfortran specific mangling. Normally DW_AT_linkage_name or
22290 DW_AT_MIPS_linkage_name is preferred and used instead. */
22298 if (prefix == NULL)
22300 if (suffix == NULL)
22307 xmalloc (strlen (prefix) + MAX_SEP_LEN + strlen (suffix) + 1));
22309 strcpy (retval, lead);
22310 strcat (retval, prefix);
22311 strcat (retval, sep);
22312 strcat (retval, suffix);
22317 /* We have an obstack. */
22318 return obconcat (obs, lead, prefix, sep, suffix, (char *) NULL);
22322 /* Return sibling of die, NULL if no sibling. */
22324 static struct die_info *
22325 sibling_die (struct die_info *die)
22327 return die->sibling;
22330 /* Get name of a die, return NULL if not found. */
22332 static const char *
22333 dwarf2_canonicalize_name (const char *name, struct dwarf2_cu *cu,
22334 struct obstack *obstack)
22336 if (name && cu->language == language_cplus)
22338 std::string canon_name = cp_canonicalize_string (name);
22340 if (!canon_name.empty ())
22342 if (canon_name != name)
22343 name = (const char *) obstack_copy0 (obstack,
22344 canon_name.c_str (),
22345 canon_name.length ());
22352 /* Get name of a die, return NULL if not found.
22353 Anonymous namespaces are converted to their magic string. */
22355 static const char *
22356 dwarf2_name (struct die_info *die, struct dwarf2_cu *cu)
22358 struct attribute *attr;
22359 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
22361 attr = dwarf2_attr (die, DW_AT_name, cu);
22362 if ((!attr || !DW_STRING (attr))
22363 && die->tag != DW_TAG_namespace
22364 && die->tag != DW_TAG_class_type
22365 && die->tag != DW_TAG_interface_type
22366 && die->tag != DW_TAG_structure_type
22367 && die->tag != DW_TAG_union_type)
22372 case DW_TAG_compile_unit:
22373 case DW_TAG_partial_unit:
22374 /* Compilation units have a DW_AT_name that is a filename, not
22375 a source language identifier. */
22376 case DW_TAG_enumeration_type:
22377 case DW_TAG_enumerator:
22378 /* These tags always have simple identifiers already; no need
22379 to canonicalize them. */
22380 return DW_STRING (attr);
22382 case DW_TAG_namespace:
22383 if (attr != NULL && DW_STRING (attr) != NULL)
22384 return DW_STRING (attr);
22385 return CP_ANONYMOUS_NAMESPACE_STR;
22387 case DW_TAG_class_type:
22388 case DW_TAG_interface_type:
22389 case DW_TAG_structure_type:
22390 case DW_TAG_union_type:
22391 /* Some GCC versions emit spurious DW_AT_name attributes for unnamed
22392 structures or unions. These were of the form "._%d" in GCC 4.1,
22393 or simply "<anonymous struct>" or "<anonymous union>" in GCC 4.3
22394 and GCC 4.4. We work around this problem by ignoring these. */
22395 if (attr && DW_STRING (attr)
22396 && (startswith (DW_STRING (attr), "._")
22397 || startswith (DW_STRING (attr), "<anonymous")))
22400 /* GCC might emit a nameless typedef that has a linkage name. See
22401 http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47510. */
22402 if (!attr || DW_STRING (attr) == NULL)
22404 char *demangled = NULL;
22406 attr = dw2_linkage_name_attr (die, cu);
22407 if (attr == NULL || DW_STRING (attr) == NULL)
22410 /* Avoid demangling DW_STRING (attr) the second time on a second
22411 call for the same DIE. */
22412 if (!DW_STRING_IS_CANONICAL (attr))
22413 demangled = gdb_demangle (DW_STRING (attr), DMGL_TYPES);
22419 /* FIXME: we already did this for the partial symbol... */
22422 obstack_copy0 (&objfile->per_bfd->storage_obstack,
22423 demangled, strlen (demangled)));
22424 DW_STRING_IS_CANONICAL (attr) = 1;
22427 /* Strip any leading namespaces/classes, keep only the base name.
22428 DW_AT_name for named DIEs does not contain the prefixes. */
22429 base = strrchr (DW_STRING (attr), ':');
22430 if (base && base > DW_STRING (attr) && base[-1] == ':')
22433 return DW_STRING (attr);
22442 if (!DW_STRING_IS_CANONICAL (attr))
22445 = dwarf2_canonicalize_name (DW_STRING (attr), cu,
22446 &objfile->per_bfd->storage_obstack);
22447 DW_STRING_IS_CANONICAL (attr) = 1;
22449 return DW_STRING (attr);
22452 /* Return the die that this die in an extension of, or NULL if there
22453 is none. *EXT_CU is the CU containing DIE on input, and the CU
22454 containing the return value on output. */
22456 static struct die_info *
22457 dwarf2_extension (struct die_info *die, struct dwarf2_cu **ext_cu)
22459 struct attribute *attr;
22461 attr = dwarf2_attr (die, DW_AT_extension, *ext_cu);
22465 return follow_die_ref (die, attr, ext_cu);
22468 /* Convert a DIE tag into its string name. */
22470 static const char *
22471 dwarf_tag_name (unsigned tag)
22473 const char *name = get_DW_TAG_name (tag);
22476 return "DW_TAG_<unknown>";
22481 /* Convert a DWARF attribute code into its string name. */
22483 static const char *
22484 dwarf_attr_name (unsigned attr)
22488 #ifdef MIPS /* collides with DW_AT_HP_block_index */
22489 if (attr == DW_AT_MIPS_fde)
22490 return "DW_AT_MIPS_fde";
22492 if (attr == DW_AT_HP_block_index)
22493 return "DW_AT_HP_block_index";
22496 name = get_DW_AT_name (attr);
22499 return "DW_AT_<unknown>";
22504 /* Convert a DWARF value form code into its string name. */
22506 static const char *
22507 dwarf_form_name (unsigned form)
22509 const char *name = get_DW_FORM_name (form);
22512 return "DW_FORM_<unknown>";
22517 static const char *
22518 dwarf_bool_name (unsigned mybool)
22526 /* Convert a DWARF type code into its string name. */
22528 static const char *
22529 dwarf_type_encoding_name (unsigned enc)
22531 const char *name = get_DW_ATE_name (enc);
22534 return "DW_ATE_<unknown>";
22540 dump_die_shallow (struct ui_file *f, int indent, struct die_info *die)
22544 print_spaces (indent, f);
22545 fprintf_unfiltered (f, "Die: %s (abbrev %d, offset %s)\n",
22546 dwarf_tag_name (die->tag), die->abbrev,
22547 sect_offset_str (die->sect_off));
22549 if (die->parent != NULL)
22551 print_spaces (indent, f);
22552 fprintf_unfiltered (f, " parent at offset: %s\n",
22553 sect_offset_str (die->parent->sect_off));
22556 print_spaces (indent, f);
22557 fprintf_unfiltered (f, " has children: %s\n",
22558 dwarf_bool_name (die->child != NULL));
22560 print_spaces (indent, f);
22561 fprintf_unfiltered (f, " attributes:\n");
22563 for (i = 0; i < die->num_attrs; ++i)
22565 print_spaces (indent, f);
22566 fprintf_unfiltered (f, " %s (%s) ",
22567 dwarf_attr_name (die->attrs[i].name),
22568 dwarf_form_name (die->attrs[i].form));
22570 switch (die->attrs[i].form)
22573 case DW_FORM_GNU_addr_index:
22574 fprintf_unfiltered (f, "address: ");
22575 fputs_filtered (hex_string (DW_ADDR (&die->attrs[i])), f);
22577 case DW_FORM_block2:
22578 case DW_FORM_block4:
22579 case DW_FORM_block:
22580 case DW_FORM_block1:
22581 fprintf_unfiltered (f, "block: size %s",
22582 pulongest (DW_BLOCK (&die->attrs[i])->size));
22584 case DW_FORM_exprloc:
22585 fprintf_unfiltered (f, "expression: size %s",
22586 pulongest (DW_BLOCK (&die->attrs[i])->size));
22588 case DW_FORM_data16:
22589 fprintf_unfiltered (f, "constant of 16 bytes");
22591 case DW_FORM_ref_addr:
22592 fprintf_unfiltered (f, "ref address: ");
22593 fputs_filtered (hex_string (DW_UNSND (&die->attrs[i])), f);
22595 case DW_FORM_GNU_ref_alt:
22596 fprintf_unfiltered (f, "alt ref address: ");
22597 fputs_filtered (hex_string (DW_UNSND (&die->attrs[i])), f);
22603 case DW_FORM_ref_udata:
22604 fprintf_unfiltered (f, "constant ref: 0x%lx (adjusted)",
22605 (long) (DW_UNSND (&die->attrs[i])));
22607 case DW_FORM_data1:
22608 case DW_FORM_data2:
22609 case DW_FORM_data4:
22610 case DW_FORM_data8:
22611 case DW_FORM_udata:
22612 case DW_FORM_sdata:
22613 fprintf_unfiltered (f, "constant: %s",
22614 pulongest (DW_UNSND (&die->attrs[i])));
22616 case DW_FORM_sec_offset:
22617 fprintf_unfiltered (f, "section offset: %s",
22618 pulongest (DW_UNSND (&die->attrs[i])));
22620 case DW_FORM_ref_sig8:
22621 fprintf_unfiltered (f, "signature: %s",
22622 hex_string (DW_SIGNATURE (&die->attrs[i])));
22624 case DW_FORM_string:
22626 case DW_FORM_line_strp:
22627 case DW_FORM_GNU_str_index:
22628 case DW_FORM_GNU_strp_alt:
22629 fprintf_unfiltered (f, "string: \"%s\" (%s canonicalized)",
22630 DW_STRING (&die->attrs[i])
22631 ? DW_STRING (&die->attrs[i]) : "",
22632 DW_STRING_IS_CANONICAL (&die->attrs[i]) ? "is" : "not");
22635 if (DW_UNSND (&die->attrs[i]))
22636 fprintf_unfiltered (f, "flag: TRUE");
22638 fprintf_unfiltered (f, "flag: FALSE");
22640 case DW_FORM_flag_present:
22641 fprintf_unfiltered (f, "flag: TRUE");
22643 case DW_FORM_indirect:
22644 /* The reader will have reduced the indirect form to
22645 the "base form" so this form should not occur. */
22646 fprintf_unfiltered (f,
22647 "unexpected attribute form: DW_FORM_indirect");
22649 case DW_FORM_implicit_const:
22650 fprintf_unfiltered (f, "constant: %s",
22651 plongest (DW_SND (&die->attrs[i])));
22654 fprintf_unfiltered (f, "unsupported attribute form: %d.",
22655 die->attrs[i].form);
22658 fprintf_unfiltered (f, "\n");
22663 dump_die_for_error (struct die_info *die)
22665 dump_die_shallow (gdb_stderr, 0, die);
22669 dump_die_1 (struct ui_file *f, int level, int max_level, struct die_info *die)
22671 int indent = level * 4;
22673 gdb_assert (die != NULL);
22675 if (level >= max_level)
22678 dump_die_shallow (f, indent, die);
22680 if (die->child != NULL)
22682 print_spaces (indent, f);
22683 fprintf_unfiltered (f, " Children:");
22684 if (level + 1 < max_level)
22686 fprintf_unfiltered (f, "\n");
22687 dump_die_1 (f, level + 1, max_level, die->child);
22691 fprintf_unfiltered (f,
22692 " [not printed, max nesting level reached]\n");
22696 if (die->sibling != NULL && level > 0)
22698 dump_die_1 (f, level, max_level, die->sibling);
22702 /* This is called from the pdie macro in gdbinit.in.
22703 It's not static so gcc will keep a copy callable from gdb. */
22706 dump_die (struct die_info *die, int max_level)
22708 dump_die_1 (gdb_stdlog, 0, max_level, die);
22712 store_in_ref_table (struct die_info *die, struct dwarf2_cu *cu)
22716 slot = htab_find_slot_with_hash (cu->die_hash, die,
22717 to_underlying (die->sect_off),
22723 /* Return DIE offset of ATTR. Return 0 with complaint if ATTR is not of the
22727 dwarf2_get_ref_die_offset (const struct attribute *attr)
22729 if (attr_form_is_ref (attr))
22730 return (sect_offset) DW_UNSND (attr);
22732 complaint (_("unsupported die ref attribute form: '%s'"),
22733 dwarf_form_name (attr->form));
22737 /* Return the constant value held by ATTR. Return DEFAULT_VALUE if
22738 * the value held by the attribute is not constant. */
22741 dwarf2_get_attr_constant_value (const struct attribute *attr, int default_value)
22743 if (attr->form == DW_FORM_sdata || attr->form == DW_FORM_implicit_const)
22744 return DW_SND (attr);
22745 else if (attr->form == DW_FORM_udata
22746 || attr->form == DW_FORM_data1
22747 || attr->form == DW_FORM_data2
22748 || attr->form == DW_FORM_data4
22749 || attr->form == DW_FORM_data8)
22750 return DW_UNSND (attr);
22753 /* For DW_FORM_data16 see attr_form_is_constant. */
22754 complaint (_("Attribute value is not a constant (%s)"),
22755 dwarf_form_name (attr->form));
22756 return default_value;
22760 /* Follow reference or signature attribute ATTR of SRC_DIE.
22761 On entry *REF_CU is the CU of SRC_DIE.
22762 On exit *REF_CU is the CU of the result. */
22764 static struct die_info *
22765 follow_die_ref_or_sig (struct die_info *src_die, const struct attribute *attr,
22766 struct dwarf2_cu **ref_cu)
22768 struct die_info *die;
22770 if (attr_form_is_ref (attr))
22771 die = follow_die_ref (src_die, attr, ref_cu);
22772 else if (attr->form == DW_FORM_ref_sig8)
22773 die = follow_die_sig (src_die, attr, ref_cu);
22776 dump_die_for_error (src_die);
22777 error (_("Dwarf Error: Expected reference attribute [in module %s]"),
22778 objfile_name ((*ref_cu)->per_cu->dwarf2_per_objfile->objfile));
22784 /* Follow reference OFFSET.
22785 On entry *REF_CU is the CU of the source die referencing OFFSET.
22786 On exit *REF_CU is the CU of the result.
22787 Returns NULL if OFFSET is invalid. */
22789 static struct die_info *
22790 follow_die_offset (sect_offset sect_off, int offset_in_dwz,
22791 struct dwarf2_cu **ref_cu)
22793 struct die_info temp_die;
22794 struct dwarf2_cu *target_cu, *cu = *ref_cu;
22795 struct dwarf2_per_objfile *dwarf2_per_objfile
22796 = cu->per_cu->dwarf2_per_objfile;
22798 gdb_assert (cu->per_cu != NULL);
22802 if (cu->per_cu->is_debug_types)
22804 /* .debug_types CUs cannot reference anything outside their CU.
22805 If they need to, they have to reference a signatured type via
22806 DW_FORM_ref_sig8. */
22807 if (!offset_in_cu_p (&cu->header, sect_off))
22810 else if (offset_in_dwz != cu->per_cu->is_dwz
22811 || !offset_in_cu_p (&cu->header, sect_off))
22813 struct dwarf2_per_cu_data *per_cu;
22815 per_cu = dwarf2_find_containing_comp_unit (sect_off, offset_in_dwz,
22816 dwarf2_per_objfile);
22818 /* If necessary, add it to the queue and load its DIEs. */
22819 if (maybe_queue_comp_unit (cu, per_cu, cu->language))
22820 load_full_comp_unit (per_cu, false, cu->language);
22822 target_cu = per_cu->cu;
22824 else if (cu->dies == NULL)
22826 /* We're loading full DIEs during partial symbol reading. */
22827 gdb_assert (dwarf2_per_objfile->reading_partial_symbols);
22828 load_full_comp_unit (cu->per_cu, false, language_minimal);
22831 *ref_cu = target_cu;
22832 temp_die.sect_off = sect_off;
22833 return (struct die_info *) htab_find_with_hash (target_cu->die_hash,
22835 to_underlying (sect_off));
22838 /* Follow reference attribute ATTR of SRC_DIE.
22839 On entry *REF_CU is the CU of SRC_DIE.
22840 On exit *REF_CU is the CU of the result. */
22842 static struct die_info *
22843 follow_die_ref (struct die_info *src_die, const struct attribute *attr,
22844 struct dwarf2_cu **ref_cu)
22846 sect_offset sect_off = dwarf2_get_ref_die_offset (attr);
22847 struct dwarf2_cu *cu = *ref_cu;
22848 struct die_info *die;
22850 die = follow_die_offset (sect_off,
22851 (attr->form == DW_FORM_GNU_ref_alt
22852 || cu->per_cu->is_dwz),
22855 error (_("Dwarf Error: Cannot find DIE at %s referenced from DIE "
22856 "at %s [in module %s]"),
22857 sect_offset_str (sect_off), sect_offset_str (src_die->sect_off),
22858 objfile_name (cu->per_cu->dwarf2_per_objfile->objfile));
22863 /* Return DWARF block referenced by DW_AT_location of DIE at SECT_OFF at PER_CU.
22864 Returned value is intended for DW_OP_call*. Returned
22865 dwarf2_locexpr_baton->data has lifetime of
22866 PER_CU->DWARF2_PER_OBJFILE->OBJFILE. */
22868 struct dwarf2_locexpr_baton
22869 dwarf2_fetch_die_loc_sect_off (sect_offset sect_off,
22870 struct dwarf2_per_cu_data *per_cu,
22871 CORE_ADDR (*get_frame_pc) (void *baton),
22874 struct dwarf2_cu *cu;
22875 struct die_info *die;
22876 struct attribute *attr;
22877 struct dwarf2_locexpr_baton retval;
22878 struct dwarf2_per_objfile *dwarf2_per_objfile = per_cu->dwarf2_per_objfile;
22879 struct objfile *objfile = dwarf2_per_objfile->objfile;
22881 if (per_cu->cu == NULL)
22882 load_cu (per_cu, false);
22886 /* We shouldn't get here for a dummy CU, but don't crash on the user.
22887 Instead just throw an error, not much else we can do. */
22888 error (_("Dwarf Error: Dummy CU at %s referenced in module %s"),
22889 sect_offset_str (sect_off), objfile_name (objfile));
22892 die = follow_die_offset (sect_off, per_cu->is_dwz, &cu);
22894 error (_("Dwarf Error: Cannot find DIE at %s referenced in module %s"),
22895 sect_offset_str (sect_off), objfile_name (objfile));
22897 attr = dwarf2_attr (die, DW_AT_location, cu);
22900 /* DWARF: "If there is no such attribute, then there is no effect.".
22901 DATA is ignored if SIZE is 0. */
22903 retval.data = NULL;
22906 else if (attr_form_is_section_offset (attr))
22908 struct dwarf2_loclist_baton loclist_baton;
22909 CORE_ADDR pc = (*get_frame_pc) (baton);
22912 fill_in_loclist_baton (cu, &loclist_baton, attr);
22914 retval.data = dwarf2_find_location_expression (&loclist_baton,
22916 retval.size = size;
22920 if (!attr_form_is_block (attr))
22921 error (_("Dwarf Error: DIE at %s referenced in module %s "
22922 "is neither DW_FORM_block* nor DW_FORM_exprloc"),
22923 sect_offset_str (sect_off), objfile_name (objfile));
22925 retval.data = DW_BLOCK (attr)->data;
22926 retval.size = DW_BLOCK (attr)->size;
22928 retval.per_cu = cu->per_cu;
22930 age_cached_comp_units (dwarf2_per_objfile);
22935 /* Like dwarf2_fetch_die_loc_sect_off, but take a CU
22938 struct dwarf2_locexpr_baton
22939 dwarf2_fetch_die_loc_cu_off (cu_offset offset_in_cu,
22940 struct dwarf2_per_cu_data *per_cu,
22941 CORE_ADDR (*get_frame_pc) (void *baton),
22944 sect_offset sect_off = per_cu->sect_off + to_underlying (offset_in_cu);
22946 return dwarf2_fetch_die_loc_sect_off (sect_off, per_cu, get_frame_pc, baton);
22949 /* Write a constant of a given type as target-ordered bytes into
22952 static const gdb_byte *
22953 write_constant_as_bytes (struct obstack *obstack,
22954 enum bfd_endian byte_order,
22961 *len = TYPE_LENGTH (type);
22962 result = (gdb_byte *) obstack_alloc (obstack, *len);
22963 store_unsigned_integer (result, *len, byte_order, value);
22968 /* If the DIE at OFFSET in PER_CU has a DW_AT_const_value, return a
22969 pointer to the constant bytes and set LEN to the length of the
22970 data. If memory is needed, allocate it on OBSTACK. If the DIE
22971 does not have a DW_AT_const_value, return NULL. */
22974 dwarf2_fetch_constant_bytes (sect_offset sect_off,
22975 struct dwarf2_per_cu_data *per_cu,
22976 struct obstack *obstack,
22979 struct dwarf2_cu *cu;
22980 struct die_info *die;
22981 struct attribute *attr;
22982 const gdb_byte *result = NULL;
22985 enum bfd_endian byte_order;
22986 struct objfile *objfile = per_cu->dwarf2_per_objfile->objfile;
22988 if (per_cu->cu == NULL)
22989 load_cu (per_cu, false);
22993 /* We shouldn't get here for a dummy CU, but don't crash on the user.
22994 Instead just throw an error, not much else we can do. */
22995 error (_("Dwarf Error: Dummy CU at %s referenced in module %s"),
22996 sect_offset_str (sect_off), objfile_name (objfile));
22999 die = follow_die_offset (sect_off, per_cu->is_dwz, &cu);
23001 error (_("Dwarf Error: Cannot find DIE at %s referenced in module %s"),
23002 sect_offset_str (sect_off), objfile_name (objfile));
23004 attr = dwarf2_attr (die, DW_AT_const_value, cu);
23008 byte_order = (bfd_big_endian (objfile->obfd)
23009 ? BFD_ENDIAN_BIG : BFD_ENDIAN_LITTLE);
23011 switch (attr->form)
23014 case DW_FORM_GNU_addr_index:
23018 *len = cu->header.addr_size;
23019 tem = (gdb_byte *) obstack_alloc (obstack, *len);
23020 store_unsigned_integer (tem, *len, byte_order, DW_ADDR (attr));
23024 case DW_FORM_string:
23026 case DW_FORM_GNU_str_index:
23027 case DW_FORM_GNU_strp_alt:
23028 /* DW_STRING is already allocated on the objfile obstack, point
23030 result = (const gdb_byte *) DW_STRING (attr);
23031 *len = strlen (DW_STRING (attr));
23033 case DW_FORM_block1:
23034 case DW_FORM_block2:
23035 case DW_FORM_block4:
23036 case DW_FORM_block:
23037 case DW_FORM_exprloc:
23038 case DW_FORM_data16:
23039 result = DW_BLOCK (attr)->data;
23040 *len = DW_BLOCK (attr)->size;
23043 /* The DW_AT_const_value attributes are supposed to carry the
23044 symbol's value "represented as it would be on the target
23045 architecture." By the time we get here, it's already been
23046 converted to host endianness, so we just need to sign- or
23047 zero-extend it as appropriate. */
23048 case DW_FORM_data1:
23049 type = die_type (die, cu);
23050 result = dwarf2_const_value_data (attr, obstack, cu, &value, 8);
23051 if (result == NULL)
23052 result = write_constant_as_bytes (obstack, byte_order,
23055 case DW_FORM_data2:
23056 type = die_type (die, cu);
23057 result = dwarf2_const_value_data (attr, obstack, cu, &value, 16);
23058 if (result == NULL)
23059 result = write_constant_as_bytes (obstack, byte_order,
23062 case DW_FORM_data4:
23063 type = die_type (die, cu);
23064 result = dwarf2_const_value_data (attr, obstack, cu, &value, 32);
23065 if (result == NULL)
23066 result = write_constant_as_bytes (obstack, byte_order,
23069 case DW_FORM_data8:
23070 type = die_type (die, cu);
23071 result = dwarf2_const_value_data (attr, obstack, cu, &value, 64);
23072 if (result == NULL)
23073 result = write_constant_as_bytes (obstack, byte_order,
23077 case DW_FORM_sdata:
23078 case DW_FORM_implicit_const:
23079 type = die_type (die, cu);
23080 result = write_constant_as_bytes (obstack, byte_order,
23081 type, DW_SND (attr), len);
23084 case DW_FORM_udata:
23085 type = die_type (die, cu);
23086 result = write_constant_as_bytes (obstack, byte_order,
23087 type, DW_UNSND (attr), len);
23091 complaint (_("unsupported const value attribute form: '%s'"),
23092 dwarf_form_name (attr->form));
23099 /* Return the type of the die at OFFSET in PER_CU. Return NULL if no
23100 valid type for this die is found. */
23103 dwarf2_fetch_die_type_sect_off (sect_offset sect_off,
23104 struct dwarf2_per_cu_data *per_cu)
23106 struct dwarf2_cu *cu;
23107 struct die_info *die;
23109 if (per_cu->cu == NULL)
23110 load_cu (per_cu, false);
23115 die = follow_die_offset (sect_off, per_cu->is_dwz, &cu);
23119 return die_type (die, cu);
23122 /* Return the type of the DIE at DIE_OFFSET in the CU named by
23126 dwarf2_get_die_type (cu_offset die_offset,
23127 struct dwarf2_per_cu_data *per_cu)
23129 sect_offset die_offset_sect = per_cu->sect_off + to_underlying (die_offset);
23130 return get_die_type_at_offset (die_offset_sect, per_cu);
23133 /* Follow type unit SIG_TYPE referenced by SRC_DIE.
23134 On entry *REF_CU is the CU of SRC_DIE.
23135 On exit *REF_CU is the CU of the result.
23136 Returns NULL if the referenced DIE isn't found. */
23138 static struct die_info *
23139 follow_die_sig_1 (struct die_info *src_die, struct signatured_type *sig_type,
23140 struct dwarf2_cu **ref_cu)
23142 struct die_info temp_die;
23143 struct dwarf2_cu *sig_cu;
23144 struct die_info *die;
23146 /* While it might be nice to assert sig_type->type == NULL here,
23147 we can get here for DW_AT_imported_declaration where we need
23148 the DIE not the type. */
23150 /* If necessary, add it to the queue and load its DIEs. */
23152 if (maybe_queue_comp_unit (*ref_cu, &sig_type->per_cu, language_minimal))
23153 read_signatured_type (sig_type);
23155 sig_cu = sig_type->per_cu.cu;
23156 gdb_assert (sig_cu != NULL);
23157 gdb_assert (to_underlying (sig_type->type_offset_in_section) != 0);
23158 temp_die.sect_off = sig_type->type_offset_in_section;
23159 die = (struct die_info *) htab_find_with_hash (sig_cu->die_hash, &temp_die,
23160 to_underlying (temp_die.sect_off));
23163 struct dwarf2_per_objfile *dwarf2_per_objfile
23164 = (*ref_cu)->per_cu->dwarf2_per_objfile;
23166 /* For .gdb_index version 7 keep track of included TUs.
23167 http://sourceware.org/bugzilla/show_bug.cgi?id=15021. */
23168 if (dwarf2_per_objfile->index_table != NULL
23169 && dwarf2_per_objfile->index_table->version <= 7)
23171 VEC_safe_push (dwarf2_per_cu_ptr,
23172 (*ref_cu)->per_cu->imported_symtabs,
23183 /* Follow signatured type referenced by ATTR in SRC_DIE.
23184 On entry *REF_CU is the CU of SRC_DIE.
23185 On exit *REF_CU is the CU of the result.
23186 The result is the DIE of the type.
23187 If the referenced type cannot be found an error is thrown. */
23189 static struct die_info *
23190 follow_die_sig (struct die_info *src_die, const struct attribute *attr,
23191 struct dwarf2_cu **ref_cu)
23193 ULONGEST signature = DW_SIGNATURE (attr);
23194 struct signatured_type *sig_type;
23195 struct die_info *die;
23197 gdb_assert (attr->form == DW_FORM_ref_sig8);
23199 sig_type = lookup_signatured_type (*ref_cu, signature);
23200 /* sig_type will be NULL if the signatured type is missing from
23202 if (sig_type == NULL)
23204 error (_("Dwarf Error: Cannot find signatured DIE %s referenced"
23205 " from DIE at %s [in module %s]"),
23206 hex_string (signature), sect_offset_str (src_die->sect_off),
23207 objfile_name ((*ref_cu)->per_cu->dwarf2_per_objfile->objfile));
23210 die = follow_die_sig_1 (src_die, sig_type, ref_cu);
23213 dump_die_for_error (src_die);
23214 error (_("Dwarf Error: Problem reading signatured DIE %s referenced"
23215 " from DIE at %s [in module %s]"),
23216 hex_string (signature), sect_offset_str (src_die->sect_off),
23217 objfile_name ((*ref_cu)->per_cu->dwarf2_per_objfile->objfile));
23223 /* Get the type specified by SIGNATURE referenced in DIE/CU,
23224 reading in and processing the type unit if necessary. */
23226 static struct type *
23227 get_signatured_type (struct die_info *die, ULONGEST signature,
23228 struct dwarf2_cu *cu)
23230 struct dwarf2_per_objfile *dwarf2_per_objfile
23231 = cu->per_cu->dwarf2_per_objfile;
23232 struct signatured_type *sig_type;
23233 struct dwarf2_cu *type_cu;
23234 struct die_info *type_die;
23237 sig_type = lookup_signatured_type (cu, signature);
23238 /* sig_type will be NULL if the signatured type is missing from
23240 if (sig_type == NULL)
23242 complaint (_("Dwarf Error: Cannot find signatured DIE %s referenced"
23243 " from DIE at %s [in module %s]"),
23244 hex_string (signature), sect_offset_str (die->sect_off),
23245 objfile_name (dwarf2_per_objfile->objfile));
23246 return build_error_marker_type (cu, die);
23249 /* If we already know the type we're done. */
23250 if (sig_type->type != NULL)
23251 return sig_type->type;
23254 type_die = follow_die_sig_1 (die, sig_type, &type_cu);
23255 if (type_die != NULL)
23257 /* N.B. We need to call get_die_type to ensure only one type for this DIE
23258 is created. This is important, for example, because for c++ classes
23259 we need TYPE_NAME set which is only done by new_symbol. Blech. */
23260 type = read_type_die (type_die, type_cu);
23263 complaint (_("Dwarf Error: Cannot build signatured type %s"
23264 " referenced from DIE at %s [in module %s]"),
23265 hex_string (signature), sect_offset_str (die->sect_off),
23266 objfile_name (dwarf2_per_objfile->objfile));
23267 type = build_error_marker_type (cu, die);
23272 complaint (_("Dwarf Error: Problem reading signatured DIE %s referenced"
23273 " from DIE at %s [in module %s]"),
23274 hex_string (signature), sect_offset_str (die->sect_off),
23275 objfile_name (dwarf2_per_objfile->objfile));
23276 type = build_error_marker_type (cu, die);
23278 sig_type->type = type;
23283 /* Get the type specified by the DW_AT_signature ATTR in DIE/CU,
23284 reading in and processing the type unit if necessary. */
23286 static struct type *
23287 get_DW_AT_signature_type (struct die_info *die, const struct attribute *attr,
23288 struct dwarf2_cu *cu) /* ARI: editCase function */
23290 /* Yes, DW_AT_signature can use a non-ref_sig8 reference. */
23291 if (attr_form_is_ref (attr))
23293 struct dwarf2_cu *type_cu = cu;
23294 struct die_info *type_die = follow_die_ref (die, attr, &type_cu);
23296 return read_type_die (type_die, type_cu);
23298 else if (attr->form == DW_FORM_ref_sig8)
23300 return get_signatured_type (die, DW_SIGNATURE (attr), cu);
23304 struct dwarf2_per_objfile *dwarf2_per_objfile
23305 = cu->per_cu->dwarf2_per_objfile;
23307 complaint (_("Dwarf Error: DW_AT_signature has bad form %s in DIE"
23308 " at %s [in module %s]"),
23309 dwarf_form_name (attr->form), sect_offset_str (die->sect_off),
23310 objfile_name (dwarf2_per_objfile->objfile));
23311 return build_error_marker_type (cu, die);
23315 /* Load the DIEs associated with type unit PER_CU into memory. */
23318 load_full_type_unit (struct dwarf2_per_cu_data *per_cu)
23320 struct signatured_type *sig_type;
23322 /* Caller is responsible for ensuring type_unit_groups don't get here. */
23323 gdb_assert (! IS_TYPE_UNIT_GROUP (per_cu));
23325 /* We have the per_cu, but we need the signatured_type.
23326 Fortunately this is an easy translation. */
23327 gdb_assert (per_cu->is_debug_types);
23328 sig_type = (struct signatured_type *) per_cu;
23330 gdb_assert (per_cu->cu == NULL);
23332 read_signatured_type (sig_type);
23334 gdb_assert (per_cu->cu != NULL);
23337 /* die_reader_func for read_signatured_type.
23338 This is identical to load_full_comp_unit_reader,
23339 but is kept separate for now. */
23342 read_signatured_type_reader (const struct die_reader_specs *reader,
23343 const gdb_byte *info_ptr,
23344 struct die_info *comp_unit_die,
23348 struct dwarf2_cu *cu = reader->cu;
23350 gdb_assert (cu->die_hash == NULL);
23352 htab_create_alloc_ex (cu->header.length / 12,
23356 &cu->comp_unit_obstack,
23357 hashtab_obstack_allocate,
23358 dummy_obstack_deallocate);
23361 comp_unit_die->child = read_die_and_siblings (reader, info_ptr,
23362 &info_ptr, comp_unit_die);
23363 cu->dies = comp_unit_die;
23364 /* comp_unit_die is not stored in die_hash, no need. */
23366 /* We try not to read any attributes in this function, because not
23367 all CUs needed for references have been loaded yet, and symbol
23368 table processing isn't initialized. But we have to set the CU language,
23369 or we won't be able to build types correctly.
23370 Similarly, if we do not read the producer, we can not apply
23371 producer-specific interpretation. */
23372 prepare_one_comp_unit (cu, cu->dies, language_minimal);
23375 /* Read in a signatured type and build its CU and DIEs.
23376 If the type is a stub for the real type in a DWO file,
23377 read in the real type from the DWO file as well. */
23380 read_signatured_type (struct signatured_type *sig_type)
23382 struct dwarf2_per_cu_data *per_cu = &sig_type->per_cu;
23384 gdb_assert (per_cu->is_debug_types);
23385 gdb_assert (per_cu->cu == NULL);
23387 init_cutu_and_read_dies (per_cu, NULL, 0, 1, false,
23388 read_signatured_type_reader, NULL);
23389 sig_type->per_cu.tu_read = 1;
23392 /* Decode simple location descriptions.
23393 Given a pointer to a dwarf block that defines a location, compute
23394 the location and return the value.
23396 NOTE drow/2003-11-18: This function is called in two situations
23397 now: for the address of static or global variables (partial symbols
23398 only) and for offsets into structures which are expected to be
23399 (more or less) constant. The partial symbol case should go away,
23400 and only the constant case should remain. That will let this
23401 function complain more accurately. A few special modes are allowed
23402 without complaint for global variables (for instance, global
23403 register values and thread-local values).
23405 A location description containing no operations indicates that the
23406 object is optimized out. The return value is 0 for that case.
23407 FIXME drow/2003-11-16: No callers check for this case any more; soon all
23408 callers will only want a very basic result and this can become a
23411 Note that stack[0] is unused except as a default error return. */
23414 decode_locdesc (struct dwarf_block *blk, struct dwarf2_cu *cu)
23416 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
23418 size_t size = blk->size;
23419 const gdb_byte *data = blk->data;
23420 CORE_ADDR stack[64];
23422 unsigned int bytes_read, unsnd;
23428 stack[++stacki] = 0;
23467 stack[++stacki] = op - DW_OP_lit0;
23502 stack[++stacki] = op - DW_OP_reg0;
23504 dwarf2_complex_location_expr_complaint ();
23508 unsnd = read_unsigned_leb128 (NULL, (data + i), &bytes_read);
23510 stack[++stacki] = unsnd;
23512 dwarf2_complex_location_expr_complaint ();
23516 stack[++stacki] = read_address (objfile->obfd, &data[i],
23521 case DW_OP_const1u:
23522 stack[++stacki] = read_1_byte (objfile->obfd, &data[i]);
23526 case DW_OP_const1s:
23527 stack[++stacki] = read_1_signed_byte (objfile->obfd, &data[i]);
23531 case DW_OP_const2u:
23532 stack[++stacki] = read_2_bytes (objfile->obfd, &data[i]);
23536 case DW_OP_const2s:
23537 stack[++stacki] = read_2_signed_bytes (objfile->obfd, &data[i]);
23541 case DW_OP_const4u:
23542 stack[++stacki] = read_4_bytes (objfile->obfd, &data[i]);
23546 case DW_OP_const4s:
23547 stack[++stacki] = read_4_signed_bytes (objfile->obfd, &data[i]);
23551 case DW_OP_const8u:
23552 stack[++stacki] = read_8_bytes (objfile->obfd, &data[i]);
23557 stack[++stacki] = read_unsigned_leb128 (NULL, (data + i),
23563 stack[++stacki] = read_signed_leb128 (NULL, (data + i), &bytes_read);
23568 stack[stacki + 1] = stack[stacki];
23573 stack[stacki - 1] += stack[stacki];
23577 case DW_OP_plus_uconst:
23578 stack[stacki] += read_unsigned_leb128 (NULL, (data + i),
23584 stack[stacki - 1] -= stack[stacki];
23589 /* If we're not the last op, then we definitely can't encode
23590 this using GDB's address_class enum. This is valid for partial
23591 global symbols, although the variable's address will be bogus
23594 dwarf2_complex_location_expr_complaint ();
23597 case DW_OP_GNU_push_tls_address:
23598 case DW_OP_form_tls_address:
23599 /* The top of the stack has the offset from the beginning
23600 of the thread control block at which the variable is located. */
23601 /* Nothing should follow this operator, so the top of stack would
23603 /* This is valid for partial global symbols, but the variable's
23604 address will be bogus in the psymtab. Make it always at least
23605 non-zero to not look as a variable garbage collected by linker
23606 which have DW_OP_addr 0. */
23608 dwarf2_complex_location_expr_complaint ();
23612 case DW_OP_GNU_uninit:
23615 case DW_OP_GNU_addr_index:
23616 case DW_OP_GNU_const_index:
23617 stack[++stacki] = read_addr_index_from_leb128 (cu, &data[i],
23624 const char *name = get_DW_OP_name (op);
23627 complaint (_("unsupported stack op: '%s'"),
23630 complaint (_("unsupported stack op: '%02x'"),
23634 return (stack[stacki]);
23637 /* Enforce maximum stack depth of SIZE-1 to avoid writing
23638 outside of the allocated space. Also enforce minimum>0. */
23639 if (stacki >= ARRAY_SIZE (stack) - 1)
23641 complaint (_("location description stack overflow"));
23647 complaint (_("location description stack underflow"));
23651 return (stack[stacki]);
23654 /* memory allocation interface */
23656 static struct dwarf_block *
23657 dwarf_alloc_block (struct dwarf2_cu *cu)
23659 return XOBNEW (&cu->comp_unit_obstack, struct dwarf_block);
23662 static struct die_info *
23663 dwarf_alloc_die (struct dwarf2_cu *cu, int num_attrs)
23665 struct die_info *die;
23666 size_t size = sizeof (struct die_info);
23669 size += (num_attrs - 1) * sizeof (struct attribute);
23671 die = (struct die_info *) obstack_alloc (&cu->comp_unit_obstack, size);
23672 memset (die, 0, sizeof (struct die_info));
23677 /* Macro support. */
23679 /* Return file name relative to the compilation directory of file number I in
23680 *LH's file name table. The result is allocated using xmalloc; the caller is
23681 responsible for freeing it. */
23684 file_file_name (int file, struct line_header *lh)
23686 /* Is the file number a valid index into the line header's file name
23687 table? Remember that file numbers start with one, not zero. */
23688 if (1 <= file && file <= lh->file_names.size ())
23690 const file_entry &fe = lh->file_names[file - 1];
23692 if (!IS_ABSOLUTE_PATH (fe.name))
23694 const char *dir = fe.include_dir (lh);
23696 return concat (dir, SLASH_STRING, fe.name, (char *) NULL);
23698 return xstrdup (fe.name);
23702 /* The compiler produced a bogus file number. We can at least
23703 record the macro definitions made in the file, even if we
23704 won't be able to find the file by name. */
23705 char fake_name[80];
23707 xsnprintf (fake_name, sizeof (fake_name),
23708 "<bad macro file number %d>", file);
23710 complaint (_("bad file number in macro information (%d)"),
23713 return xstrdup (fake_name);
23717 /* Return the full name of file number I in *LH's file name table.
23718 Use COMP_DIR as the name of the current directory of the
23719 compilation. The result is allocated using xmalloc; the caller is
23720 responsible for freeing it. */
23722 file_full_name (int file, struct line_header *lh, const char *comp_dir)
23724 /* Is the file number a valid index into the line header's file name
23725 table? Remember that file numbers start with one, not zero. */
23726 if (1 <= file && file <= lh->file_names.size ())
23728 char *relative = file_file_name (file, lh);
23730 if (IS_ABSOLUTE_PATH (relative) || comp_dir == NULL)
23732 return reconcat (relative, comp_dir, SLASH_STRING,
23733 relative, (char *) NULL);
23736 return file_file_name (file, lh);
23740 static struct macro_source_file *
23741 macro_start_file (struct dwarf2_cu *cu,
23742 int file, int line,
23743 struct macro_source_file *current_file,
23744 struct line_header *lh)
23746 /* File name relative to the compilation directory of this source file. */
23747 char *file_name = file_file_name (file, lh);
23749 if (! current_file)
23751 /* Note: We don't create a macro table for this compilation unit
23752 at all until we actually get a filename. */
23753 struct macro_table *macro_table = cu->builder->get_macro_table ();
23755 /* If we have no current file, then this must be the start_file
23756 directive for the compilation unit's main source file. */
23757 current_file = macro_set_main (macro_table, file_name);
23758 macro_define_special (macro_table);
23761 current_file = macro_include (current_file, line, file_name);
23765 return current_file;
23768 static const char *
23769 consume_improper_spaces (const char *p, const char *body)
23773 complaint (_("macro definition contains spaces "
23774 "in formal argument list:\n`%s'"),
23786 parse_macro_definition (struct macro_source_file *file, int line,
23791 /* The body string takes one of two forms. For object-like macro
23792 definitions, it should be:
23794 <macro name> " " <definition>
23796 For function-like macro definitions, it should be:
23798 <macro name> "() " <definition>
23800 <macro name> "(" <arg name> ( "," <arg name> ) * ") " <definition>
23802 Spaces may appear only where explicitly indicated, and in the
23805 The Dwarf 2 spec says that an object-like macro's name is always
23806 followed by a space, but versions of GCC around March 2002 omit
23807 the space when the macro's definition is the empty string.
23809 The Dwarf 2 spec says that there should be no spaces between the
23810 formal arguments in a function-like macro's formal argument list,
23811 but versions of GCC around March 2002 include spaces after the
23815 /* Find the extent of the macro name. The macro name is terminated
23816 by either a space or null character (for an object-like macro) or
23817 an opening paren (for a function-like macro). */
23818 for (p = body; *p; p++)
23819 if (*p == ' ' || *p == '(')
23822 if (*p == ' ' || *p == '\0')
23824 /* It's an object-like macro. */
23825 int name_len = p - body;
23826 char *name = savestring (body, name_len);
23827 const char *replacement;
23830 replacement = body + name_len + 1;
23833 dwarf2_macro_malformed_definition_complaint (body);
23834 replacement = body + name_len;
23837 macro_define_object (file, line, name, replacement);
23841 else if (*p == '(')
23843 /* It's a function-like macro. */
23844 char *name = savestring (body, p - body);
23847 char **argv = XNEWVEC (char *, argv_size);
23851 p = consume_improper_spaces (p, body);
23853 /* Parse the formal argument list. */
23854 while (*p && *p != ')')
23856 /* Find the extent of the current argument name. */
23857 const char *arg_start = p;
23859 while (*p && *p != ',' && *p != ')' && *p != ' ')
23862 if (! *p || p == arg_start)
23863 dwarf2_macro_malformed_definition_complaint (body);
23866 /* Make sure argv has room for the new argument. */
23867 if (argc >= argv_size)
23870 argv = XRESIZEVEC (char *, argv, argv_size);
23873 argv[argc++] = savestring (arg_start, p - arg_start);
23876 p = consume_improper_spaces (p, body);
23878 /* Consume the comma, if present. */
23883 p = consume_improper_spaces (p, body);
23892 /* Perfectly formed definition, no complaints. */
23893 macro_define_function (file, line, name,
23894 argc, (const char **) argv,
23896 else if (*p == '\0')
23898 /* Complain, but do define it. */
23899 dwarf2_macro_malformed_definition_complaint (body);
23900 macro_define_function (file, line, name,
23901 argc, (const char **) argv,
23905 /* Just complain. */
23906 dwarf2_macro_malformed_definition_complaint (body);
23909 /* Just complain. */
23910 dwarf2_macro_malformed_definition_complaint (body);
23916 for (i = 0; i < argc; i++)
23922 dwarf2_macro_malformed_definition_complaint (body);
23925 /* Skip some bytes from BYTES according to the form given in FORM.
23926 Returns the new pointer. */
23928 static const gdb_byte *
23929 skip_form_bytes (bfd *abfd, const gdb_byte *bytes, const gdb_byte *buffer_end,
23930 enum dwarf_form form,
23931 unsigned int offset_size,
23932 struct dwarf2_section_info *section)
23934 unsigned int bytes_read;
23938 case DW_FORM_data1:
23943 case DW_FORM_data2:
23947 case DW_FORM_data4:
23951 case DW_FORM_data8:
23955 case DW_FORM_data16:
23959 case DW_FORM_string:
23960 read_direct_string (abfd, bytes, &bytes_read);
23961 bytes += bytes_read;
23964 case DW_FORM_sec_offset:
23966 case DW_FORM_GNU_strp_alt:
23967 bytes += offset_size;
23970 case DW_FORM_block:
23971 bytes += read_unsigned_leb128 (abfd, bytes, &bytes_read);
23972 bytes += bytes_read;
23975 case DW_FORM_block1:
23976 bytes += 1 + read_1_byte (abfd, bytes);
23978 case DW_FORM_block2:
23979 bytes += 2 + read_2_bytes (abfd, bytes);
23981 case DW_FORM_block4:
23982 bytes += 4 + read_4_bytes (abfd, bytes);
23985 case DW_FORM_sdata:
23986 case DW_FORM_udata:
23987 case DW_FORM_GNU_addr_index:
23988 case DW_FORM_GNU_str_index:
23989 bytes = gdb_skip_leb128 (bytes, buffer_end);
23992 dwarf2_section_buffer_overflow_complaint (section);
23997 case DW_FORM_implicit_const:
24002 complaint (_("invalid form 0x%x in `%s'"),
24003 form, get_section_name (section));
24011 /* A helper for dwarf_decode_macros that handles skipping an unknown
24012 opcode. Returns an updated pointer to the macro data buffer; or,
24013 on error, issues a complaint and returns NULL. */
24015 static const gdb_byte *
24016 skip_unknown_opcode (unsigned int opcode,
24017 const gdb_byte **opcode_definitions,
24018 const gdb_byte *mac_ptr, const gdb_byte *mac_end,
24020 unsigned int offset_size,
24021 struct dwarf2_section_info *section)
24023 unsigned int bytes_read, i;
24025 const gdb_byte *defn;
24027 if (opcode_definitions[opcode] == NULL)
24029 complaint (_("unrecognized DW_MACFINO opcode 0x%x"),
24034 defn = opcode_definitions[opcode];
24035 arg = read_unsigned_leb128 (abfd, defn, &bytes_read);
24036 defn += bytes_read;
24038 for (i = 0; i < arg; ++i)
24040 mac_ptr = skip_form_bytes (abfd, mac_ptr, mac_end,
24041 (enum dwarf_form) defn[i], offset_size,
24043 if (mac_ptr == NULL)
24045 /* skip_form_bytes already issued the complaint. */
24053 /* A helper function which parses the header of a macro section.
24054 If the macro section is the extended (for now called "GNU") type,
24055 then this updates *OFFSET_SIZE. Returns a pointer to just after
24056 the header, or issues a complaint and returns NULL on error. */
24058 static const gdb_byte *
24059 dwarf_parse_macro_header (const gdb_byte **opcode_definitions,
24061 const gdb_byte *mac_ptr,
24062 unsigned int *offset_size,
24063 int section_is_gnu)
24065 memset (opcode_definitions, 0, 256 * sizeof (gdb_byte *));
24067 if (section_is_gnu)
24069 unsigned int version, flags;
24071 version = read_2_bytes (abfd, mac_ptr);
24072 if (version != 4 && version != 5)
24074 complaint (_("unrecognized version `%d' in .debug_macro section"),
24080 flags = read_1_byte (abfd, mac_ptr);
24082 *offset_size = (flags & 1) ? 8 : 4;
24084 if ((flags & 2) != 0)
24085 /* We don't need the line table offset. */
24086 mac_ptr += *offset_size;
24088 /* Vendor opcode descriptions. */
24089 if ((flags & 4) != 0)
24091 unsigned int i, count;
24093 count = read_1_byte (abfd, mac_ptr);
24095 for (i = 0; i < count; ++i)
24097 unsigned int opcode, bytes_read;
24100 opcode = read_1_byte (abfd, mac_ptr);
24102 opcode_definitions[opcode] = mac_ptr;
24103 arg = read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
24104 mac_ptr += bytes_read;
24113 /* A helper for dwarf_decode_macros that handles the GNU extensions,
24114 including DW_MACRO_import. */
24117 dwarf_decode_macro_bytes (struct dwarf2_cu *cu,
24119 const gdb_byte *mac_ptr, const gdb_byte *mac_end,
24120 struct macro_source_file *current_file,
24121 struct line_header *lh,
24122 struct dwarf2_section_info *section,
24123 int section_is_gnu, int section_is_dwz,
24124 unsigned int offset_size,
24125 htab_t include_hash)
24127 struct dwarf2_per_objfile *dwarf2_per_objfile
24128 = cu->per_cu->dwarf2_per_objfile;
24129 struct objfile *objfile = dwarf2_per_objfile->objfile;
24130 enum dwarf_macro_record_type macinfo_type;
24131 int at_commandline;
24132 const gdb_byte *opcode_definitions[256];
24134 mac_ptr = dwarf_parse_macro_header (opcode_definitions, abfd, mac_ptr,
24135 &offset_size, section_is_gnu);
24136 if (mac_ptr == NULL)
24138 /* We already issued a complaint. */
24142 /* Determines if GDB is still before first DW_MACINFO_start_file. If true
24143 GDB is still reading the definitions from command line. First
24144 DW_MACINFO_start_file will need to be ignored as it was already executed
24145 to create CURRENT_FILE for the main source holding also the command line
24146 definitions. On first met DW_MACINFO_start_file this flag is reset to
24147 normally execute all the remaining DW_MACINFO_start_file macinfos. */
24149 at_commandline = 1;
24153 /* Do we at least have room for a macinfo type byte? */
24154 if (mac_ptr >= mac_end)
24156 dwarf2_section_buffer_overflow_complaint (section);
24160 macinfo_type = (enum dwarf_macro_record_type) read_1_byte (abfd, mac_ptr);
24163 /* Note that we rely on the fact that the corresponding GNU and
24164 DWARF constants are the same. */
24166 DIAGNOSTIC_IGNORE_SWITCH_DIFFERENT_ENUM_TYPES
24167 switch (macinfo_type)
24169 /* A zero macinfo type indicates the end of the macro
24174 case DW_MACRO_define:
24175 case DW_MACRO_undef:
24176 case DW_MACRO_define_strp:
24177 case DW_MACRO_undef_strp:
24178 case DW_MACRO_define_sup:
24179 case DW_MACRO_undef_sup:
24181 unsigned int bytes_read;
24186 line = read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
24187 mac_ptr += bytes_read;
24189 if (macinfo_type == DW_MACRO_define
24190 || macinfo_type == DW_MACRO_undef)
24192 body = read_direct_string (abfd, mac_ptr, &bytes_read);
24193 mac_ptr += bytes_read;
24197 LONGEST str_offset;
24199 str_offset = read_offset_1 (abfd, mac_ptr, offset_size);
24200 mac_ptr += offset_size;
24202 if (macinfo_type == DW_MACRO_define_sup
24203 || macinfo_type == DW_MACRO_undef_sup
24206 struct dwz_file *dwz
24207 = dwarf2_get_dwz_file (dwarf2_per_objfile);
24209 body = read_indirect_string_from_dwz (objfile,
24213 body = read_indirect_string_at_offset (dwarf2_per_objfile,
24217 is_define = (macinfo_type == DW_MACRO_define
24218 || macinfo_type == DW_MACRO_define_strp
24219 || macinfo_type == DW_MACRO_define_sup);
24220 if (! current_file)
24222 /* DWARF violation as no main source is present. */
24223 complaint (_("debug info with no main source gives macro %s "
24225 is_define ? _("definition") : _("undefinition"),
24229 if ((line == 0 && !at_commandline)
24230 || (line != 0 && at_commandline))
24231 complaint (_("debug info gives %s macro %s with %s line %d: %s"),
24232 at_commandline ? _("command-line") : _("in-file"),
24233 is_define ? _("definition") : _("undefinition"),
24234 line == 0 ? _("zero") : _("non-zero"), line, body);
24237 parse_macro_definition (current_file, line, body);
24240 gdb_assert (macinfo_type == DW_MACRO_undef
24241 || macinfo_type == DW_MACRO_undef_strp
24242 || macinfo_type == DW_MACRO_undef_sup);
24243 macro_undef (current_file, line, body);
24248 case DW_MACRO_start_file:
24250 unsigned int bytes_read;
24253 line = read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
24254 mac_ptr += bytes_read;
24255 file = read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
24256 mac_ptr += bytes_read;
24258 if ((line == 0 && !at_commandline)
24259 || (line != 0 && at_commandline))
24260 complaint (_("debug info gives source %d included "
24261 "from %s at %s line %d"),
24262 file, at_commandline ? _("command-line") : _("file"),
24263 line == 0 ? _("zero") : _("non-zero"), line);
24265 if (at_commandline)
24267 /* This DW_MACRO_start_file was executed in the
24269 at_commandline = 0;
24272 current_file = macro_start_file (cu, file, line, current_file,
24277 case DW_MACRO_end_file:
24278 if (! current_file)
24279 complaint (_("macro debug info has an unmatched "
24280 "`close_file' directive"));
24283 current_file = current_file->included_by;
24284 if (! current_file)
24286 enum dwarf_macro_record_type next_type;
24288 /* GCC circa March 2002 doesn't produce the zero
24289 type byte marking the end of the compilation
24290 unit. Complain if it's not there, but exit no
24293 /* Do we at least have room for a macinfo type byte? */
24294 if (mac_ptr >= mac_end)
24296 dwarf2_section_buffer_overflow_complaint (section);
24300 /* We don't increment mac_ptr here, so this is just
24303 = (enum dwarf_macro_record_type) read_1_byte (abfd,
24305 if (next_type != 0)
24306 complaint (_("no terminating 0-type entry for "
24307 "macros in `.debug_macinfo' section"));
24314 case DW_MACRO_import:
24315 case DW_MACRO_import_sup:
24319 bfd *include_bfd = abfd;
24320 struct dwarf2_section_info *include_section = section;
24321 const gdb_byte *include_mac_end = mac_end;
24322 int is_dwz = section_is_dwz;
24323 const gdb_byte *new_mac_ptr;
24325 offset = read_offset_1 (abfd, mac_ptr, offset_size);
24326 mac_ptr += offset_size;
24328 if (macinfo_type == DW_MACRO_import_sup)
24330 struct dwz_file *dwz = dwarf2_get_dwz_file (dwarf2_per_objfile);
24332 dwarf2_read_section (objfile, &dwz->macro);
24334 include_section = &dwz->macro;
24335 include_bfd = get_section_bfd_owner (include_section);
24336 include_mac_end = dwz->macro.buffer + dwz->macro.size;
24340 new_mac_ptr = include_section->buffer + offset;
24341 slot = htab_find_slot (include_hash, new_mac_ptr, INSERT);
24345 /* This has actually happened; see
24346 http://sourceware.org/bugzilla/show_bug.cgi?id=13568. */
24347 complaint (_("recursive DW_MACRO_import in "
24348 ".debug_macro section"));
24352 *slot = (void *) new_mac_ptr;
24354 dwarf_decode_macro_bytes (cu, include_bfd, new_mac_ptr,
24355 include_mac_end, current_file, lh,
24356 section, section_is_gnu, is_dwz,
24357 offset_size, include_hash);
24359 htab_remove_elt (include_hash, (void *) new_mac_ptr);
24364 case DW_MACINFO_vendor_ext:
24365 if (!section_is_gnu)
24367 unsigned int bytes_read;
24369 /* This reads the constant, but since we don't recognize
24370 any vendor extensions, we ignore it. */
24371 read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
24372 mac_ptr += bytes_read;
24373 read_direct_string (abfd, mac_ptr, &bytes_read);
24374 mac_ptr += bytes_read;
24376 /* We don't recognize any vendor extensions. */
24382 mac_ptr = skip_unknown_opcode (macinfo_type, opcode_definitions,
24383 mac_ptr, mac_end, abfd, offset_size,
24385 if (mac_ptr == NULL)
24390 } while (macinfo_type != 0);
24394 dwarf_decode_macros (struct dwarf2_cu *cu, unsigned int offset,
24395 int section_is_gnu)
24397 struct dwarf2_per_objfile *dwarf2_per_objfile
24398 = cu->per_cu->dwarf2_per_objfile;
24399 struct objfile *objfile = dwarf2_per_objfile->objfile;
24400 struct line_header *lh = cu->line_header;
24402 const gdb_byte *mac_ptr, *mac_end;
24403 struct macro_source_file *current_file = 0;
24404 enum dwarf_macro_record_type macinfo_type;
24405 unsigned int offset_size = cu->header.offset_size;
24406 const gdb_byte *opcode_definitions[256];
24408 struct dwarf2_section_info *section;
24409 const char *section_name;
24411 if (cu->dwo_unit != NULL)
24413 if (section_is_gnu)
24415 section = &cu->dwo_unit->dwo_file->sections.macro;
24416 section_name = ".debug_macro.dwo";
24420 section = &cu->dwo_unit->dwo_file->sections.macinfo;
24421 section_name = ".debug_macinfo.dwo";
24426 if (section_is_gnu)
24428 section = &dwarf2_per_objfile->macro;
24429 section_name = ".debug_macro";
24433 section = &dwarf2_per_objfile->macinfo;
24434 section_name = ".debug_macinfo";
24438 dwarf2_read_section (objfile, section);
24439 if (section->buffer == NULL)
24441 complaint (_("missing %s section"), section_name);
24444 abfd = get_section_bfd_owner (section);
24446 /* First pass: Find the name of the base filename.
24447 This filename is needed in order to process all macros whose definition
24448 (or undefinition) comes from the command line. These macros are defined
24449 before the first DW_MACINFO_start_file entry, and yet still need to be
24450 associated to the base file.
24452 To determine the base file name, we scan the macro definitions until we
24453 reach the first DW_MACINFO_start_file entry. We then initialize
24454 CURRENT_FILE accordingly so that any macro definition found before the
24455 first DW_MACINFO_start_file can still be associated to the base file. */
24457 mac_ptr = section->buffer + offset;
24458 mac_end = section->buffer + section->size;
24460 mac_ptr = dwarf_parse_macro_header (opcode_definitions, abfd, mac_ptr,
24461 &offset_size, section_is_gnu);
24462 if (mac_ptr == NULL)
24464 /* We already issued a complaint. */
24470 /* Do we at least have room for a macinfo type byte? */
24471 if (mac_ptr >= mac_end)
24473 /* Complaint is printed during the second pass as GDB will probably
24474 stop the first pass earlier upon finding
24475 DW_MACINFO_start_file. */
24479 macinfo_type = (enum dwarf_macro_record_type) read_1_byte (abfd, mac_ptr);
24482 /* Note that we rely on the fact that the corresponding GNU and
24483 DWARF constants are the same. */
24485 DIAGNOSTIC_IGNORE_SWITCH_DIFFERENT_ENUM_TYPES
24486 switch (macinfo_type)
24488 /* A zero macinfo type indicates the end of the macro
24493 case DW_MACRO_define:
24494 case DW_MACRO_undef:
24495 /* Only skip the data by MAC_PTR. */
24497 unsigned int bytes_read;
24499 read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
24500 mac_ptr += bytes_read;
24501 read_direct_string (abfd, mac_ptr, &bytes_read);
24502 mac_ptr += bytes_read;
24506 case DW_MACRO_start_file:
24508 unsigned int bytes_read;
24511 line = read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
24512 mac_ptr += bytes_read;
24513 file = read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
24514 mac_ptr += bytes_read;
24516 current_file = macro_start_file (cu, file, line, current_file, lh);
24520 case DW_MACRO_end_file:
24521 /* No data to skip by MAC_PTR. */
24524 case DW_MACRO_define_strp:
24525 case DW_MACRO_undef_strp:
24526 case DW_MACRO_define_sup:
24527 case DW_MACRO_undef_sup:
24529 unsigned int bytes_read;
24531 read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
24532 mac_ptr += bytes_read;
24533 mac_ptr += offset_size;
24537 case DW_MACRO_import:
24538 case DW_MACRO_import_sup:
24539 /* Note that, according to the spec, a transparent include
24540 chain cannot call DW_MACRO_start_file. So, we can just
24541 skip this opcode. */
24542 mac_ptr += offset_size;
24545 case DW_MACINFO_vendor_ext:
24546 /* Only skip the data by MAC_PTR. */
24547 if (!section_is_gnu)
24549 unsigned int bytes_read;
24551 read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
24552 mac_ptr += bytes_read;
24553 read_direct_string (abfd, mac_ptr, &bytes_read);
24554 mac_ptr += bytes_read;
24559 mac_ptr = skip_unknown_opcode (macinfo_type, opcode_definitions,
24560 mac_ptr, mac_end, abfd, offset_size,
24562 if (mac_ptr == NULL)
24567 } while (macinfo_type != 0 && current_file == NULL);
24569 /* Second pass: Process all entries.
24571 Use the AT_COMMAND_LINE flag to determine whether we are still processing
24572 command-line macro definitions/undefinitions. This flag is unset when we
24573 reach the first DW_MACINFO_start_file entry. */
24575 htab_up include_hash (htab_create_alloc (1, htab_hash_pointer,
24577 NULL, xcalloc, xfree));
24578 mac_ptr = section->buffer + offset;
24579 slot = htab_find_slot (include_hash.get (), mac_ptr, INSERT);
24580 *slot = (void *) mac_ptr;
24581 dwarf_decode_macro_bytes (cu, abfd, mac_ptr, mac_end,
24582 current_file, lh, section,
24583 section_is_gnu, 0, offset_size,
24584 include_hash.get ());
24587 /* Check if the attribute's form is a DW_FORM_block*
24588 if so return true else false. */
24591 attr_form_is_block (const struct attribute *attr)
24593 return (attr == NULL ? 0 :
24594 attr->form == DW_FORM_block1
24595 || attr->form == DW_FORM_block2
24596 || attr->form == DW_FORM_block4
24597 || attr->form == DW_FORM_block
24598 || attr->form == DW_FORM_exprloc);
24601 /* Return non-zero if ATTR's value is a section offset --- classes
24602 lineptr, loclistptr, macptr or rangelistptr --- or zero, otherwise.
24603 You may use DW_UNSND (attr) to retrieve such offsets.
24605 Section 7.5.4, "Attribute Encodings", explains that no attribute
24606 may have a value that belongs to more than one of these classes; it
24607 would be ambiguous if we did, because we use the same forms for all
24611 attr_form_is_section_offset (const struct attribute *attr)
24613 return (attr->form == DW_FORM_data4
24614 || attr->form == DW_FORM_data8
24615 || attr->form == DW_FORM_sec_offset);
24618 /* Return non-zero if ATTR's value falls in the 'constant' class, or
24619 zero otherwise. When this function returns true, you can apply
24620 dwarf2_get_attr_constant_value to it.
24622 However, note that for some attributes you must check
24623 attr_form_is_section_offset before using this test. DW_FORM_data4
24624 and DW_FORM_data8 are members of both the constant class, and of
24625 the classes that contain offsets into other debug sections
24626 (lineptr, loclistptr, macptr or rangelistptr). The DWARF spec says
24627 that, if an attribute's can be either a constant or one of the
24628 section offset classes, DW_FORM_data4 and DW_FORM_data8 should be
24629 taken as section offsets, not constants.
24631 DW_FORM_data16 is not considered as dwarf2_get_attr_constant_value
24632 cannot handle that. */
24635 attr_form_is_constant (const struct attribute *attr)
24637 switch (attr->form)
24639 case DW_FORM_sdata:
24640 case DW_FORM_udata:
24641 case DW_FORM_data1:
24642 case DW_FORM_data2:
24643 case DW_FORM_data4:
24644 case DW_FORM_data8:
24645 case DW_FORM_implicit_const:
24653 /* DW_ADDR is always stored already as sect_offset; despite for the forms
24654 besides DW_FORM_ref_addr it is stored as cu_offset in the DWARF file. */
24657 attr_form_is_ref (const struct attribute *attr)
24659 switch (attr->form)
24661 case DW_FORM_ref_addr:
24666 case DW_FORM_ref_udata:
24667 case DW_FORM_GNU_ref_alt:
24674 /* Return the .debug_loc section to use for CU.
24675 For DWO files use .debug_loc.dwo. */
24677 static struct dwarf2_section_info *
24678 cu_debug_loc_section (struct dwarf2_cu *cu)
24680 struct dwarf2_per_objfile *dwarf2_per_objfile
24681 = cu->per_cu->dwarf2_per_objfile;
24685 struct dwo_sections *sections = &cu->dwo_unit->dwo_file->sections;
24687 return cu->header.version >= 5 ? §ions->loclists : §ions->loc;
24689 return (cu->header.version >= 5 ? &dwarf2_per_objfile->loclists
24690 : &dwarf2_per_objfile->loc);
24693 /* A helper function that fills in a dwarf2_loclist_baton. */
24696 fill_in_loclist_baton (struct dwarf2_cu *cu,
24697 struct dwarf2_loclist_baton *baton,
24698 const struct attribute *attr)
24700 struct dwarf2_per_objfile *dwarf2_per_objfile
24701 = cu->per_cu->dwarf2_per_objfile;
24702 struct dwarf2_section_info *section = cu_debug_loc_section (cu);
24704 dwarf2_read_section (dwarf2_per_objfile->objfile, section);
24706 baton->per_cu = cu->per_cu;
24707 gdb_assert (baton->per_cu);
24708 /* We don't know how long the location list is, but make sure we
24709 don't run off the edge of the section. */
24710 baton->size = section->size - DW_UNSND (attr);
24711 baton->data = section->buffer + DW_UNSND (attr);
24712 baton->base_address = cu->base_address;
24713 baton->from_dwo = cu->dwo_unit != NULL;
24717 dwarf2_symbol_mark_computed (const struct attribute *attr, struct symbol *sym,
24718 struct dwarf2_cu *cu, int is_block)
24720 struct dwarf2_per_objfile *dwarf2_per_objfile
24721 = cu->per_cu->dwarf2_per_objfile;
24722 struct objfile *objfile = dwarf2_per_objfile->objfile;
24723 struct dwarf2_section_info *section = cu_debug_loc_section (cu);
24725 if (attr_form_is_section_offset (attr)
24726 /* .debug_loc{,.dwo} may not exist at all, or the offset may be outside
24727 the section. If so, fall through to the complaint in the
24729 && DW_UNSND (attr) < dwarf2_section_size (objfile, section))
24731 struct dwarf2_loclist_baton *baton;
24733 baton = XOBNEW (&objfile->objfile_obstack, struct dwarf2_loclist_baton);
24735 fill_in_loclist_baton (cu, baton, attr);
24737 if (cu->base_known == 0)
24738 complaint (_("Location list used without "
24739 "specifying the CU base address."));
24741 SYMBOL_ACLASS_INDEX (sym) = (is_block
24742 ? dwarf2_loclist_block_index
24743 : dwarf2_loclist_index);
24744 SYMBOL_LOCATION_BATON (sym) = baton;
24748 struct dwarf2_locexpr_baton *baton;
24750 baton = XOBNEW (&objfile->objfile_obstack, struct dwarf2_locexpr_baton);
24751 baton->per_cu = cu->per_cu;
24752 gdb_assert (baton->per_cu);
24754 if (attr_form_is_block (attr))
24756 /* Note that we're just copying the block's data pointer
24757 here, not the actual data. We're still pointing into the
24758 info_buffer for SYM's objfile; right now we never release
24759 that buffer, but when we do clean up properly this may
24761 baton->size = DW_BLOCK (attr)->size;
24762 baton->data = DW_BLOCK (attr)->data;
24766 dwarf2_invalid_attrib_class_complaint ("location description",
24767 SYMBOL_NATURAL_NAME (sym));
24771 SYMBOL_ACLASS_INDEX (sym) = (is_block
24772 ? dwarf2_locexpr_block_index
24773 : dwarf2_locexpr_index);
24774 SYMBOL_LOCATION_BATON (sym) = baton;
24778 /* Return the OBJFILE associated with the compilation unit CU. If CU
24779 came from a separate debuginfo file, then the master objfile is
24783 dwarf2_per_cu_objfile (struct dwarf2_per_cu_data *per_cu)
24785 struct objfile *objfile = per_cu->dwarf2_per_objfile->objfile;
24787 /* Return the master objfile, so that we can report and look up the
24788 correct file containing this variable. */
24789 if (objfile->separate_debug_objfile_backlink)
24790 objfile = objfile->separate_debug_objfile_backlink;
24795 /* Return comp_unit_head for PER_CU, either already available in PER_CU->CU
24796 (CU_HEADERP is unused in such case) or prepare a temporary copy at
24797 CU_HEADERP first. */
24799 static const struct comp_unit_head *
24800 per_cu_header_read_in (struct comp_unit_head *cu_headerp,
24801 struct dwarf2_per_cu_data *per_cu)
24803 const gdb_byte *info_ptr;
24806 return &per_cu->cu->header;
24808 info_ptr = per_cu->section->buffer + to_underlying (per_cu->sect_off);
24810 memset (cu_headerp, 0, sizeof (*cu_headerp));
24811 read_comp_unit_head (cu_headerp, info_ptr, per_cu->section,
24812 rcuh_kind::COMPILE);
24817 /* Return the address size given in the compilation unit header for CU. */
24820 dwarf2_per_cu_addr_size (struct dwarf2_per_cu_data *per_cu)
24822 struct comp_unit_head cu_header_local;
24823 const struct comp_unit_head *cu_headerp;
24825 cu_headerp = per_cu_header_read_in (&cu_header_local, per_cu);
24827 return cu_headerp->addr_size;
24830 /* Return the offset size given in the compilation unit header for CU. */
24833 dwarf2_per_cu_offset_size (struct dwarf2_per_cu_data *per_cu)
24835 struct comp_unit_head cu_header_local;
24836 const struct comp_unit_head *cu_headerp;
24838 cu_headerp = per_cu_header_read_in (&cu_header_local, per_cu);
24840 return cu_headerp->offset_size;
24843 /* See its dwarf2loc.h declaration. */
24846 dwarf2_per_cu_ref_addr_size (struct dwarf2_per_cu_data *per_cu)
24848 struct comp_unit_head cu_header_local;
24849 const struct comp_unit_head *cu_headerp;
24851 cu_headerp = per_cu_header_read_in (&cu_header_local, per_cu);
24853 if (cu_headerp->version == 2)
24854 return cu_headerp->addr_size;
24856 return cu_headerp->offset_size;
24859 /* Return the text offset of the CU. The returned offset comes from
24860 this CU's objfile. If this objfile came from a separate debuginfo
24861 file, then the offset may be different from the corresponding
24862 offset in the parent objfile. */
24865 dwarf2_per_cu_text_offset (struct dwarf2_per_cu_data *per_cu)
24867 struct objfile *objfile = per_cu->dwarf2_per_objfile->objfile;
24869 return ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
24872 /* Return DWARF version number of PER_CU. */
24875 dwarf2_version (struct dwarf2_per_cu_data *per_cu)
24877 return per_cu->dwarf_version;
24880 /* Locate the .debug_info compilation unit from CU's objfile which contains
24881 the DIE at OFFSET. Raises an error on failure. */
24883 static struct dwarf2_per_cu_data *
24884 dwarf2_find_containing_comp_unit (sect_offset sect_off,
24885 unsigned int offset_in_dwz,
24886 struct dwarf2_per_objfile *dwarf2_per_objfile)
24888 struct dwarf2_per_cu_data *this_cu;
24890 const sect_offset *cu_off;
24893 high = dwarf2_per_objfile->all_comp_units.size () - 1;
24896 struct dwarf2_per_cu_data *mid_cu;
24897 int mid = low + (high - low) / 2;
24899 mid_cu = dwarf2_per_objfile->all_comp_units[mid];
24900 cu_off = &mid_cu->sect_off;
24901 if (mid_cu->is_dwz > offset_in_dwz
24902 || (mid_cu->is_dwz == offset_in_dwz && *cu_off >= sect_off))
24907 gdb_assert (low == high);
24908 this_cu = dwarf2_per_objfile->all_comp_units[low];
24909 cu_off = &this_cu->sect_off;
24910 if (this_cu->is_dwz != offset_in_dwz || *cu_off > sect_off)
24912 if (low == 0 || this_cu->is_dwz != offset_in_dwz)
24913 error (_("Dwarf Error: could not find partial DIE containing "
24914 "offset %s [in module %s]"),
24915 sect_offset_str (sect_off),
24916 bfd_get_filename (dwarf2_per_objfile->objfile->obfd));
24918 gdb_assert (dwarf2_per_objfile->all_comp_units[low-1]->sect_off
24920 return dwarf2_per_objfile->all_comp_units[low-1];
24924 this_cu = dwarf2_per_objfile->all_comp_units[low];
24925 if (low == dwarf2_per_objfile->all_comp_units.size () - 1
24926 && sect_off >= this_cu->sect_off + this_cu->length)
24927 error (_("invalid dwarf2 offset %s"), sect_offset_str (sect_off));
24928 gdb_assert (sect_off < this_cu->sect_off + this_cu->length);
24933 /* Initialize dwarf2_cu CU, owned by PER_CU. */
24935 dwarf2_cu::dwarf2_cu (struct dwarf2_per_cu_data *per_cu_)
24936 : per_cu (per_cu_),
24939 checked_producer (0),
24940 producer_is_gxx_lt_4_6 (0),
24941 producer_is_gcc_lt_4_3 (0),
24942 producer_is_icc_lt_14 (0),
24943 processing_has_namespace_info (0)
24948 /* Destroy a dwarf2_cu. */
24950 dwarf2_cu::~dwarf2_cu ()
24955 /* Initialize basic fields of dwarf_cu CU according to DIE COMP_UNIT_DIE. */
24958 prepare_one_comp_unit (struct dwarf2_cu *cu, struct die_info *comp_unit_die,
24959 enum language pretend_language)
24961 struct attribute *attr;
24963 /* Set the language we're debugging. */
24964 attr = dwarf2_attr (comp_unit_die, DW_AT_language, cu);
24966 set_cu_language (DW_UNSND (attr), cu);
24969 cu->language = pretend_language;
24970 cu->language_defn = language_def (cu->language);
24973 cu->producer = dwarf2_string_attr (comp_unit_die, DW_AT_producer, cu);
24976 /* Increase the age counter on each cached compilation unit, and free
24977 any that are too old. */
24980 age_cached_comp_units (struct dwarf2_per_objfile *dwarf2_per_objfile)
24982 struct dwarf2_per_cu_data *per_cu, **last_chain;
24984 dwarf2_clear_marks (dwarf2_per_objfile->read_in_chain);
24985 per_cu = dwarf2_per_objfile->read_in_chain;
24986 while (per_cu != NULL)
24988 per_cu->cu->last_used ++;
24989 if (per_cu->cu->last_used <= dwarf_max_cache_age)
24990 dwarf2_mark (per_cu->cu);
24991 per_cu = per_cu->cu->read_in_chain;
24994 per_cu = dwarf2_per_objfile->read_in_chain;
24995 last_chain = &dwarf2_per_objfile->read_in_chain;
24996 while (per_cu != NULL)
24998 struct dwarf2_per_cu_data *next_cu;
25000 next_cu = per_cu->cu->read_in_chain;
25002 if (!per_cu->cu->mark)
25005 *last_chain = next_cu;
25008 last_chain = &per_cu->cu->read_in_chain;
25014 /* Remove a single compilation unit from the cache. */
25017 free_one_cached_comp_unit (struct dwarf2_per_cu_data *target_per_cu)
25019 struct dwarf2_per_cu_data *per_cu, **last_chain;
25020 struct dwarf2_per_objfile *dwarf2_per_objfile
25021 = target_per_cu->dwarf2_per_objfile;
25023 per_cu = dwarf2_per_objfile->read_in_chain;
25024 last_chain = &dwarf2_per_objfile->read_in_chain;
25025 while (per_cu != NULL)
25027 struct dwarf2_per_cu_data *next_cu;
25029 next_cu = per_cu->cu->read_in_chain;
25031 if (per_cu == target_per_cu)
25035 *last_chain = next_cu;
25039 last_chain = &per_cu->cu->read_in_chain;
25045 /* Cleanup function for the dwarf2_per_objfile data. */
25048 dwarf2_free_objfile (struct objfile *objfile, void *datum)
25050 struct dwarf2_per_objfile *dwarf2_per_objfile
25051 = static_cast<struct dwarf2_per_objfile *> (datum);
25053 delete dwarf2_per_objfile;
25056 /* A set of CU "per_cu" pointer, DIE offset, and GDB type pointer.
25057 We store these in a hash table separate from the DIEs, and preserve them
25058 when the DIEs are flushed out of cache.
25060 The CU "per_cu" pointer is needed because offset alone is not enough to
25061 uniquely identify the type. A file may have multiple .debug_types sections,
25062 or the type may come from a DWO file. Furthermore, while it's more logical
25063 to use per_cu->section+offset, with Fission the section with the data is in
25064 the DWO file but we don't know that section at the point we need it.
25065 We have to use something in dwarf2_per_cu_data (or the pointer to it)
25066 because we can enter the lookup routine, get_die_type_at_offset, from
25067 outside this file, and thus won't necessarily have PER_CU->cu.
25068 Fortunately, PER_CU is stable for the life of the objfile. */
25070 struct dwarf2_per_cu_offset_and_type
25072 const struct dwarf2_per_cu_data *per_cu;
25073 sect_offset sect_off;
25077 /* Hash function for a dwarf2_per_cu_offset_and_type. */
25080 per_cu_offset_and_type_hash (const void *item)
25082 const struct dwarf2_per_cu_offset_and_type *ofs
25083 = (const struct dwarf2_per_cu_offset_and_type *) item;
25085 return (uintptr_t) ofs->per_cu + to_underlying (ofs->sect_off);
25088 /* Equality function for a dwarf2_per_cu_offset_and_type. */
25091 per_cu_offset_and_type_eq (const void *item_lhs, const void *item_rhs)
25093 const struct dwarf2_per_cu_offset_and_type *ofs_lhs
25094 = (const struct dwarf2_per_cu_offset_and_type *) item_lhs;
25095 const struct dwarf2_per_cu_offset_and_type *ofs_rhs
25096 = (const struct dwarf2_per_cu_offset_and_type *) item_rhs;
25098 return (ofs_lhs->per_cu == ofs_rhs->per_cu
25099 && ofs_lhs->sect_off == ofs_rhs->sect_off);
25102 /* Set the type associated with DIE to TYPE. Save it in CU's hash
25103 table if necessary. For convenience, return TYPE.
25105 The DIEs reading must have careful ordering to:
25106 * Not cause infite loops trying to read in DIEs as a prerequisite for
25107 reading current DIE.
25108 * Not trying to dereference contents of still incompletely read in types
25109 while reading in other DIEs.
25110 * Enable referencing still incompletely read in types just by a pointer to
25111 the type without accessing its fields.
25113 Therefore caller should follow these rules:
25114 * Try to fetch any prerequisite types we may need to build this DIE type
25115 before building the type and calling set_die_type.
25116 * After building type call set_die_type for current DIE as soon as
25117 possible before fetching more types to complete the current type.
25118 * Make the type as complete as possible before fetching more types. */
25120 static struct type *
25121 set_die_type (struct die_info *die, struct type *type, struct dwarf2_cu *cu)
25123 struct dwarf2_per_objfile *dwarf2_per_objfile
25124 = cu->per_cu->dwarf2_per_objfile;
25125 struct dwarf2_per_cu_offset_and_type **slot, ofs;
25126 struct objfile *objfile = dwarf2_per_objfile->objfile;
25127 struct attribute *attr;
25128 struct dynamic_prop prop;
25130 /* For Ada types, make sure that the gnat-specific data is always
25131 initialized (if not already set). There are a few types where
25132 we should not be doing so, because the type-specific area is
25133 already used to hold some other piece of info (eg: TYPE_CODE_FLT
25134 where the type-specific area is used to store the floatformat).
25135 But this is not a problem, because the gnat-specific information
25136 is actually not needed for these types. */
25137 if (need_gnat_info (cu)
25138 && TYPE_CODE (type) != TYPE_CODE_FUNC
25139 && TYPE_CODE (type) != TYPE_CODE_FLT
25140 && TYPE_CODE (type) != TYPE_CODE_METHODPTR
25141 && TYPE_CODE (type) != TYPE_CODE_MEMBERPTR
25142 && TYPE_CODE (type) != TYPE_CODE_METHOD
25143 && !HAVE_GNAT_AUX_INFO (type))
25144 INIT_GNAT_SPECIFIC (type);
25146 /* Read DW_AT_allocated and set in type. */
25147 attr = dwarf2_attr (die, DW_AT_allocated, cu);
25148 if (attr_form_is_block (attr))
25150 if (attr_to_dynamic_prop (attr, die, cu, &prop))
25151 add_dyn_prop (DYN_PROP_ALLOCATED, prop, type);
25153 else if (attr != NULL)
25155 complaint (_("DW_AT_allocated has the wrong form (%s) at DIE %s"),
25156 (attr != NULL ? dwarf_form_name (attr->form) : "n/a"),
25157 sect_offset_str (die->sect_off));
25160 /* Read DW_AT_associated and set in type. */
25161 attr = dwarf2_attr (die, DW_AT_associated, cu);
25162 if (attr_form_is_block (attr))
25164 if (attr_to_dynamic_prop (attr, die, cu, &prop))
25165 add_dyn_prop (DYN_PROP_ASSOCIATED, prop, type);
25167 else if (attr != NULL)
25169 complaint (_("DW_AT_associated has the wrong form (%s) at DIE %s"),
25170 (attr != NULL ? dwarf_form_name (attr->form) : "n/a"),
25171 sect_offset_str (die->sect_off));
25174 /* Read DW_AT_data_location and set in type. */
25175 attr = dwarf2_attr (die, DW_AT_data_location, cu);
25176 if (attr_to_dynamic_prop (attr, die, cu, &prop))
25177 add_dyn_prop (DYN_PROP_DATA_LOCATION, prop, type);
25179 if (dwarf2_per_objfile->die_type_hash == NULL)
25181 dwarf2_per_objfile->die_type_hash =
25182 htab_create_alloc_ex (127,
25183 per_cu_offset_and_type_hash,
25184 per_cu_offset_and_type_eq,
25186 &objfile->objfile_obstack,
25187 hashtab_obstack_allocate,
25188 dummy_obstack_deallocate);
25191 ofs.per_cu = cu->per_cu;
25192 ofs.sect_off = die->sect_off;
25194 slot = (struct dwarf2_per_cu_offset_and_type **)
25195 htab_find_slot (dwarf2_per_objfile->die_type_hash, &ofs, INSERT);
25197 complaint (_("A problem internal to GDB: DIE %s has type already set"),
25198 sect_offset_str (die->sect_off));
25199 *slot = XOBNEW (&objfile->objfile_obstack,
25200 struct dwarf2_per_cu_offset_and_type);
25205 /* Look up the type for the die at SECT_OFF in PER_CU in die_type_hash,
25206 or return NULL if the die does not have a saved type. */
25208 static struct type *
25209 get_die_type_at_offset (sect_offset sect_off,
25210 struct dwarf2_per_cu_data *per_cu)
25212 struct dwarf2_per_cu_offset_and_type *slot, ofs;
25213 struct dwarf2_per_objfile *dwarf2_per_objfile = per_cu->dwarf2_per_objfile;
25215 if (dwarf2_per_objfile->die_type_hash == NULL)
25218 ofs.per_cu = per_cu;
25219 ofs.sect_off = sect_off;
25220 slot = ((struct dwarf2_per_cu_offset_and_type *)
25221 htab_find (dwarf2_per_objfile->die_type_hash, &ofs));
25228 /* Look up the type for DIE in CU in die_type_hash,
25229 or return NULL if DIE does not have a saved type. */
25231 static struct type *
25232 get_die_type (struct die_info *die, struct dwarf2_cu *cu)
25234 return get_die_type_at_offset (die->sect_off, cu->per_cu);
25237 /* Add a dependence relationship from CU to REF_PER_CU. */
25240 dwarf2_add_dependence (struct dwarf2_cu *cu,
25241 struct dwarf2_per_cu_data *ref_per_cu)
25245 if (cu->dependencies == NULL)
25247 = htab_create_alloc_ex (5, htab_hash_pointer, htab_eq_pointer,
25248 NULL, &cu->comp_unit_obstack,
25249 hashtab_obstack_allocate,
25250 dummy_obstack_deallocate);
25252 slot = htab_find_slot (cu->dependencies, ref_per_cu, INSERT);
25254 *slot = ref_per_cu;
25257 /* Subroutine of dwarf2_mark to pass to htab_traverse.
25258 Set the mark field in every compilation unit in the
25259 cache that we must keep because we are keeping CU. */
25262 dwarf2_mark_helper (void **slot, void *data)
25264 struct dwarf2_per_cu_data *per_cu;
25266 per_cu = (struct dwarf2_per_cu_data *) *slot;
25268 /* cu->dependencies references may not yet have been ever read if QUIT aborts
25269 reading of the chain. As such dependencies remain valid it is not much
25270 useful to track and undo them during QUIT cleanups. */
25271 if (per_cu->cu == NULL)
25274 if (per_cu->cu->mark)
25276 per_cu->cu->mark = 1;
25278 if (per_cu->cu->dependencies != NULL)
25279 htab_traverse (per_cu->cu->dependencies, dwarf2_mark_helper, NULL);
25284 /* Set the mark field in CU and in every other compilation unit in the
25285 cache that we must keep because we are keeping CU. */
25288 dwarf2_mark (struct dwarf2_cu *cu)
25293 if (cu->dependencies != NULL)
25294 htab_traverse (cu->dependencies, dwarf2_mark_helper, NULL);
25298 dwarf2_clear_marks (struct dwarf2_per_cu_data *per_cu)
25302 per_cu->cu->mark = 0;
25303 per_cu = per_cu->cu->read_in_chain;
25307 /* Trivial hash function for partial_die_info: the hash value of a DIE
25308 is its offset in .debug_info for this objfile. */
25311 partial_die_hash (const void *item)
25313 const struct partial_die_info *part_die
25314 = (const struct partial_die_info *) item;
25316 return to_underlying (part_die->sect_off);
25319 /* Trivial comparison function for partial_die_info structures: two DIEs
25320 are equal if they have the same offset. */
25323 partial_die_eq (const void *item_lhs, const void *item_rhs)
25325 const struct partial_die_info *part_die_lhs
25326 = (const struct partial_die_info *) item_lhs;
25327 const struct partial_die_info *part_die_rhs
25328 = (const struct partial_die_info *) item_rhs;
25330 return part_die_lhs->sect_off == part_die_rhs->sect_off;
25333 static struct cmd_list_element *set_dwarf_cmdlist;
25334 static struct cmd_list_element *show_dwarf_cmdlist;
25337 set_dwarf_cmd (const char *args, int from_tty)
25339 help_list (set_dwarf_cmdlist, "maintenance set dwarf ", all_commands,
25344 show_dwarf_cmd (const char *args, int from_tty)
25346 cmd_show_list (show_dwarf_cmdlist, from_tty, "");
25349 int dwarf_always_disassemble;
25352 show_dwarf_always_disassemble (struct ui_file *file, int from_tty,
25353 struct cmd_list_element *c, const char *value)
25355 fprintf_filtered (file,
25356 _("Whether to always disassemble "
25357 "DWARF expressions is %s.\n"),
25362 show_check_physname (struct ui_file *file, int from_tty,
25363 struct cmd_list_element *c, const char *value)
25365 fprintf_filtered (file,
25366 _("Whether to check \"physname\" is %s.\n"),
25371 _initialize_dwarf2_read (void)
25373 dwarf2_objfile_data_key
25374 = register_objfile_data_with_cleanup (nullptr, dwarf2_free_objfile);
25376 add_prefix_cmd ("dwarf", class_maintenance, set_dwarf_cmd, _("\
25377 Set DWARF specific variables.\n\
25378 Configure DWARF variables such as the cache size"),
25379 &set_dwarf_cmdlist, "maintenance set dwarf ",
25380 0/*allow-unknown*/, &maintenance_set_cmdlist);
25382 add_prefix_cmd ("dwarf", class_maintenance, show_dwarf_cmd, _("\
25383 Show DWARF specific variables\n\
25384 Show DWARF variables such as the cache size"),
25385 &show_dwarf_cmdlist, "maintenance show dwarf ",
25386 0/*allow-unknown*/, &maintenance_show_cmdlist);
25388 add_setshow_zinteger_cmd ("max-cache-age", class_obscure,
25389 &dwarf_max_cache_age, _("\
25390 Set the upper bound on the age of cached DWARF compilation units."), _("\
25391 Show the upper bound on the age of cached DWARF compilation units."), _("\
25392 A higher limit means that cached compilation units will be stored\n\
25393 in memory longer, and more total memory will be used. Zero disables\n\
25394 caching, which can slow down startup."),
25396 show_dwarf_max_cache_age,
25397 &set_dwarf_cmdlist,
25398 &show_dwarf_cmdlist);
25400 add_setshow_boolean_cmd ("always-disassemble", class_obscure,
25401 &dwarf_always_disassemble, _("\
25402 Set whether `info address' always disassembles DWARF expressions."), _("\
25403 Show whether `info address' always disassembles DWARF expressions."), _("\
25404 When enabled, DWARF expressions are always printed in an assembly-like\n\
25405 syntax. When disabled, expressions will be printed in a more\n\
25406 conversational style, when possible."),
25408 show_dwarf_always_disassemble,
25409 &set_dwarf_cmdlist,
25410 &show_dwarf_cmdlist);
25412 add_setshow_zuinteger_cmd ("dwarf-read", no_class, &dwarf_read_debug, _("\
25413 Set debugging of the DWARF reader."), _("\
25414 Show debugging of the DWARF reader."), _("\
25415 When enabled (non-zero), debugging messages are printed during DWARF\n\
25416 reading and symtab expansion. A value of 1 (one) provides basic\n\
25417 information. A value greater than 1 provides more verbose information."),
25420 &setdebuglist, &showdebuglist);
25422 add_setshow_zuinteger_cmd ("dwarf-die", no_class, &dwarf_die_debug, _("\
25423 Set debugging of the DWARF DIE reader."), _("\
25424 Show debugging of the DWARF DIE reader."), _("\
25425 When enabled (non-zero), DIEs are dumped after they are read in.\n\
25426 The value is the maximum depth to print."),
25429 &setdebuglist, &showdebuglist);
25431 add_setshow_zuinteger_cmd ("dwarf-line", no_class, &dwarf_line_debug, _("\
25432 Set debugging of the dwarf line reader."), _("\
25433 Show debugging of the dwarf line reader."), _("\
25434 When enabled (non-zero), line number entries are dumped as they are read in.\n\
25435 A value of 1 (one) provides basic information.\n\
25436 A value greater than 1 provides more verbose information."),
25439 &setdebuglist, &showdebuglist);
25441 add_setshow_boolean_cmd ("check-physname", no_class, &check_physname, _("\
25442 Set cross-checking of \"physname\" code against demangler."), _("\
25443 Show cross-checking of \"physname\" code against demangler."), _("\
25444 When enabled, GDB's internal \"physname\" code is checked against\n\
25446 NULL, show_check_physname,
25447 &setdebuglist, &showdebuglist);
25449 add_setshow_boolean_cmd ("use-deprecated-index-sections",
25450 no_class, &use_deprecated_index_sections, _("\
25451 Set whether to use deprecated gdb_index sections."), _("\
25452 Show whether to use deprecated gdb_index sections."), _("\
25453 When enabled, deprecated .gdb_index sections are used anyway.\n\
25454 Normally they are ignored either because of a missing feature or\n\
25455 performance issue.\n\
25456 Warning: This option must be enabled before gdb reads the file."),
25459 &setlist, &showlist);
25461 dwarf2_locexpr_index = register_symbol_computed_impl (LOC_COMPUTED,
25462 &dwarf2_locexpr_funcs);
25463 dwarf2_loclist_index = register_symbol_computed_impl (LOC_COMPUTED,
25464 &dwarf2_loclist_funcs);
25466 dwarf2_locexpr_block_index = register_symbol_block_impl (LOC_BLOCK,
25467 &dwarf2_block_frame_base_locexpr_funcs);
25468 dwarf2_loclist_block_index = register_symbol_block_impl (LOC_BLOCK,
25469 &dwarf2_block_frame_base_loclist_funcs);
25472 selftests::register_test ("dw2_expand_symtabs_matching",
25473 selftests::dw2_expand_symtabs_matching::run_test);