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 generic symbol table building routines have separate lists for
439 file scope symbols and all all other scopes (local scopes). So
440 we need to select the right one to pass to add_symbol_to_list().
441 We do it by keeping a pointer to the correct list in list_in_scope.
443 FIXME: The original dwarf code just treated the file scope as the
444 first local scope, and all other local scopes as nested local
445 scopes, and worked fine. Check to see if we really need to
446 distinguish these in buildsym.c. */
447 struct pending **list_in_scope = nullptr;
449 /* Hash table holding all the loaded partial DIEs
450 with partial_die->offset.SECT_OFF as hash. */
451 htab_t partial_dies = nullptr;
453 /* Storage for things with the same lifetime as this read-in compilation
454 unit, including partial DIEs. */
455 auto_obstack comp_unit_obstack;
457 /* When multiple dwarf2_cu structures are living in memory, this field
458 chains them all together, so that they can be released efficiently.
459 We will probably also want a generation counter so that most-recently-used
460 compilation units are cached... */
461 struct dwarf2_per_cu_data *read_in_chain = nullptr;
463 /* Backlink to our per_cu entry. */
464 struct dwarf2_per_cu_data *per_cu;
466 /* How many compilation units ago was this CU last referenced? */
469 /* A hash table of DIE cu_offset for following references with
470 die_info->offset.sect_off as hash. */
471 htab_t die_hash = nullptr;
473 /* Full DIEs if read in. */
474 struct die_info *dies = nullptr;
476 /* A set of pointers to dwarf2_per_cu_data objects for compilation
477 units referenced by this one. Only set during full symbol processing;
478 partial symbol tables do not have dependencies. */
479 htab_t dependencies = nullptr;
481 /* Header data from the line table, during full symbol processing. */
482 struct line_header *line_header = nullptr;
483 /* Non-NULL if LINE_HEADER is owned by this DWARF_CU. Otherwise,
484 it's owned by dwarf2_per_objfile::line_header_hash. If non-NULL,
485 this is the DW_TAG_compile_unit die for this CU. We'll hold on
486 to the line header as long as this DIE is being processed. See
487 process_die_scope. */
488 die_info *line_header_die_owner = nullptr;
490 /* A list of methods which need to have physnames computed
491 after all type information has been read. */
492 std::vector<delayed_method_info> method_list;
494 /* To be copied to symtab->call_site_htab. */
495 htab_t call_site_htab = nullptr;
497 /* Non-NULL if this CU came from a DWO file.
498 There is an invariant here that is important to remember:
499 Except for attributes copied from the top level DIE in the "main"
500 (or "stub") file in preparation for reading the DWO file
501 (e.g., DW_AT_GNU_addr_base), we KISS: there is only *one* CU.
502 Either there isn't a DWO file (in which case this is NULL and the point
503 is moot), or there is and either we're not going to read it (in which
504 case this is NULL) or there is and we are reading it (in which case this
506 struct dwo_unit *dwo_unit = nullptr;
508 /* The DW_AT_addr_base attribute if present, zero otherwise
509 (zero is a valid value though).
510 Note this value comes from the Fission stub CU/TU's DIE. */
511 ULONGEST addr_base = 0;
513 /* The DW_AT_ranges_base attribute if present, zero otherwise
514 (zero is a valid value though).
515 Note this value comes from the Fission stub CU/TU's DIE.
516 Also note that the value is zero in the non-DWO case so this value can
517 be used without needing to know whether DWO files are in use or not.
518 N.B. This does not apply to DW_AT_ranges appearing in
519 DW_TAG_compile_unit dies. This is a bit of a wart, consider if ever
520 DW_AT_ranges appeared in the DW_TAG_compile_unit of DWO DIEs: then
521 DW_AT_ranges_base *would* have to be applied, and we'd have to care
522 whether the DW_AT_ranges attribute came from the skeleton or DWO. */
523 ULONGEST ranges_base = 0;
525 /* When reading debug info generated by older versions of rustc, we
526 have to rewrite some union types to be struct types with a
527 variant part. This rewriting must be done after the CU is fully
528 read in, because otherwise at the point of rewriting some struct
529 type might not have been fully processed. So, we keep a list of
530 all such types here and process them after expansion. */
531 std::vector<struct type *> rust_unions;
533 /* Mark used when releasing cached dies. */
534 unsigned int mark : 1;
536 /* This CU references .debug_loc. See the symtab->locations_valid field.
537 This test is imperfect as there may exist optimized debug code not using
538 any location list and still facing inlining issues if handled as
539 unoptimized code. For a future better test see GCC PR other/32998. */
540 unsigned int has_loclist : 1;
542 /* These cache the results for producer_is_* fields. CHECKED_PRODUCER is set
543 if all the producer_is_* fields are valid. This information is cached
544 because profiling CU expansion showed excessive time spent in
545 producer_is_gxx_lt_4_6. */
546 unsigned int checked_producer : 1;
547 unsigned int producer_is_gxx_lt_4_6 : 1;
548 unsigned int producer_is_gcc_lt_4_3 : 1;
549 unsigned int producer_is_icc_lt_14 : 1;
551 /* When set, the file that we're processing is known to have
552 debugging info for C++ namespaces. GCC 3.3.x did not produce
553 this information, but later versions do. */
555 unsigned int processing_has_namespace_info : 1;
557 struct partial_die_info *find_partial_die (sect_offset sect_off);
560 /* A struct that can be used as a hash key for tables based on DW_AT_stmt_list.
561 This includes type_unit_group and quick_file_names. */
563 struct stmt_list_hash
565 /* The DWO unit this table is from or NULL if there is none. */
566 struct dwo_unit *dwo_unit;
568 /* Offset in .debug_line or .debug_line.dwo. */
569 sect_offset line_sect_off;
572 /* Each element of dwarf2_per_objfile->type_unit_groups is a pointer to
573 an object of this type. */
575 struct type_unit_group
577 /* dwarf2read.c's main "handle" on a TU symtab.
578 To simplify things we create an artificial CU that "includes" all the
579 type units using this stmt_list so that the rest of the code still has
580 a "per_cu" handle on the symtab.
581 This PER_CU is recognized by having no section. */
582 #define IS_TYPE_UNIT_GROUP(per_cu) ((per_cu)->section == NULL)
583 struct dwarf2_per_cu_data per_cu;
585 /* The TUs that share this DW_AT_stmt_list entry.
586 This is added to while parsing type units to build partial symtabs,
587 and is deleted afterwards and not used again. */
588 VEC (sig_type_ptr) *tus;
590 /* The compunit symtab.
591 Type units in a group needn't all be defined in the same source file,
592 so we create an essentially anonymous symtab as the compunit symtab. */
593 struct compunit_symtab *compunit_symtab;
595 /* The data used to construct the hash key. */
596 struct stmt_list_hash hash;
598 /* The number of symtabs from the line header.
599 The value here must match line_header.num_file_names. */
600 unsigned int num_symtabs;
602 /* The symbol tables for this TU (obtained from the files listed in
604 WARNING: The order of entries here must match the order of entries
605 in the line header. After the first TU using this type_unit_group, the
606 line header for the subsequent TUs is recreated from this. This is done
607 because we need to use the same symtabs for each TU using the same
608 DW_AT_stmt_list value. Also note that symtabs may be repeated here,
609 there's no guarantee the line header doesn't have duplicate entries. */
610 struct symtab **symtabs;
613 /* These sections are what may appear in a (real or virtual) DWO file. */
617 struct dwarf2_section_info abbrev;
618 struct dwarf2_section_info line;
619 struct dwarf2_section_info loc;
620 struct dwarf2_section_info loclists;
621 struct dwarf2_section_info macinfo;
622 struct dwarf2_section_info macro;
623 struct dwarf2_section_info str;
624 struct dwarf2_section_info str_offsets;
625 /* In the case of a virtual DWO file, these two are unused. */
626 struct dwarf2_section_info info;
627 VEC (dwarf2_section_info_def) *types;
630 /* CUs/TUs in DWP/DWO files. */
634 /* Backlink to the containing struct dwo_file. */
635 struct dwo_file *dwo_file;
637 /* The "id" that distinguishes this CU/TU.
638 .debug_info calls this "dwo_id", .debug_types calls this "signature".
639 Since signatures came first, we stick with it for consistency. */
642 /* The section this CU/TU lives in, in the DWO file. */
643 struct dwarf2_section_info *section;
645 /* Same as dwarf2_per_cu_data:{sect_off,length} but in the DWO section. */
646 sect_offset sect_off;
649 /* For types, offset in the type's DIE of the type defined by this TU. */
650 cu_offset type_offset_in_tu;
653 /* include/dwarf2.h defines the DWP section codes.
654 It defines a max value but it doesn't define a min value, which we
655 use for error checking, so provide one. */
657 enum dwp_v2_section_ids
662 /* Data for one DWO file.
664 This includes virtual DWO files (a virtual DWO file is a DWO file as it
665 appears in a DWP file). DWP files don't really have DWO files per se -
666 comdat folding of types "loses" the DWO file they came from, and from
667 a high level view DWP files appear to contain a mass of random types.
668 However, to maintain consistency with the non-DWP case we pretend DWP
669 files contain virtual DWO files, and we assign each TU with one virtual
670 DWO file (generally based on the line and abbrev section offsets -
671 a heuristic that seems to work in practice). */
675 /* The DW_AT_GNU_dwo_name attribute.
676 For virtual DWO files the name is constructed from the section offsets
677 of abbrev,line,loc,str_offsets so that we combine virtual DWO files
678 from related CU+TUs. */
679 const char *dwo_name;
681 /* The DW_AT_comp_dir attribute. */
682 const char *comp_dir;
684 /* The bfd, when the file is open. Otherwise this is NULL.
685 This is unused(NULL) for virtual DWO files where we use dwp_file.dbfd. */
688 /* The sections that make up this DWO file.
689 Remember that for virtual DWO files in DWP V2, these are virtual
690 sections (for lack of a better name). */
691 struct dwo_sections sections;
693 /* The CUs in the file.
694 Each element is a struct dwo_unit. Multiple CUs per DWO are supported as
695 an extension to handle LLVM's Link Time Optimization output (where
696 multiple source files may be compiled into a single object/dwo pair). */
699 /* Table of TUs in the file.
700 Each element is a struct dwo_unit. */
704 /* These sections are what may appear in a DWP file. */
708 /* These are used by both DWP version 1 and 2. */
709 struct dwarf2_section_info str;
710 struct dwarf2_section_info cu_index;
711 struct dwarf2_section_info tu_index;
713 /* These are only used by DWP version 2 files.
714 In DWP version 1 the .debug_info.dwo, .debug_types.dwo, and other
715 sections are referenced by section number, and are not recorded here.
716 In DWP version 2 there is at most one copy of all these sections, each
717 section being (effectively) comprised of the concatenation of all of the
718 individual sections that exist in the version 1 format.
719 To keep the code simple we treat each of these concatenated pieces as a
720 section itself (a virtual section?). */
721 struct dwarf2_section_info abbrev;
722 struct dwarf2_section_info info;
723 struct dwarf2_section_info line;
724 struct dwarf2_section_info loc;
725 struct dwarf2_section_info macinfo;
726 struct dwarf2_section_info macro;
727 struct dwarf2_section_info str_offsets;
728 struct dwarf2_section_info types;
731 /* These sections are what may appear in a virtual DWO file in DWP version 1.
732 A virtual DWO file is a DWO file as it appears in a DWP file. */
734 struct virtual_v1_dwo_sections
736 struct dwarf2_section_info abbrev;
737 struct dwarf2_section_info line;
738 struct dwarf2_section_info loc;
739 struct dwarf2_section_info macinfo;
740 struct dwarf2_section_info macro;
741 struct dwarf2_section_info str_offsets;
742 /* Each DWP hash table entry records one CU or one TU.
743 That is recorded here, and copied to dwo_unit.section. */
744 struct dwarf2_section_info info_or_types;
747 /* Similar to virtual_v1_dwo_sections, but for DWP version 2.
748 In version 2, the sections of the DWO files are concatenated together
749 and stored in one section of that name. Thus each ELF section contains
750 several "virtual" sections. */
752 struct virtual_v2_dwo_sections
754 bfd_size_type abbrev_offset;
755 bfd_size_type abbrev_size;
757 bfd_size_type line_offset;
758 bfd_size_type line_size;
760 bfd_size_type loc_offset;
761 bfd_size_type loc_size;
763 bfd_size_type macinfo_offset;
764 bfd_size_type macinfo_size;
766 bfd_size_type macro_offset;
767 bfd_size_type macro_size;
769 bfd_size_type str_offsets_offset;
770 bfd_size_type str_offsets_size;
772 /* Each DWP hash table entry records one CU or one TU.
773 That is recorded here, and copied to dwo_unit.section. */
774 bfd_size_type info_or_types_offset;
775 bfd_size_type info_or_types_size;
778 /* Contents of DWP hash tables. */
780 struct dwp_hash_table
782 uint32_t version, nr_columns;
783 uint32_t nr_units, nr_slots;
784 const gdb_byte *hash_table, *unit_table;
789 const gdb_byte *indices;
793 /* This is indexed by column number and gives the id of the section
795 #define MAX_NR_V2_DWO_SECTIONS \
796 (1 /* .debug_info or .debug_types */ \
797 + 1 /* .debug_abbrev */ \
798 + 1 /* .debug_line */ \
799 + 1 /* .debug_loc */ \
800 + 1 /* .debug_str_offsets */ \
801 + 1 /* .debug_macro or .debug_macinfo */)
802 int section_ids[MAX_NR_V2_DWO_SECTIONS];
803 const gdb_byte *offsets;
804 const gdb_byte *sizes;
809 /* Data for one DWP file. */
813 dwp_file (const char *name_, gdb_bfd_ref_ptr &&abfd)
815 dbfd (std::move (abfd))
819 /* Name of the file. */
822 /* File format version. */
826 gdb_bfd_ref_ptr dbfd;
828 /* Section info for this file. */
829 struct dwp_sections sections {};
831 /* Table of CUs in the file. */
832 const struct dwp_hash_table *cus = nullptr;
834 /* Table of TUs in the file. */
835 const struct dwp_hash_table *tus = nullptr;
837 /* Tables of loaded CUs/TUs. Each entry is a struct dwo_unit *. */
838 htab_t loaded_cus {};
839 htab_t loaded_tus {};
841 /* Table to map ELF section numbers to their sections.
842 This is only needed for the DWP V1 file format. */
843 unsigned int num_sections = 0;
844 asection **elf_sections = nullptr;
847 /* This represents a '.dwz' file. */
851 dwz_file (gdb_bfd_ref_ptr &&bfd)
852 : dwz_bfd (std::move (bfd))
856 /* A dwz file can only contain a few sections. */
857 struct dwarf2_section_info abbrev {};
858 struct dwarf2_section_info info {};
859 struct dwarf2_section_info str {};
860 struct dwarf2_section_info line {};
861 struct dwarf2_section_info macro {};
862 struct dwarf2_section_info gdb_index {};
863 struct dwarf2_section_info debug_names {};
866 gdb_bfd_ref_ptr dwz_bfd;
869 /* Struct used to pass misc. parameters to read_die_and_children, et
870 al. which are used for both .debug_info and .debug_types dies.
871 All parameters here are unchanging for the life of the call. This
872 struct exists to abstract away the constant parameters of die reading. */
874 struct die_reader_specs
876 /* The bfd of die_section. */
879 /* The CU of the DIE we are parsing. */
880 struct dwarf2_cu *cu;
882 /* Non-NULL if reading a DWO file (including one packaged into a DWP). */
883 struct dwo_file *dwo_file;
885 /* The section the die comes from.
886 This is either .debug_info or .debug_types, or the .dwo variants. */
887 struct dwarf2_section_info *die_section;
889 /* die_section->buffer. */
890 const gdb_byte *buffer;
892 /* The end of the buffer. */
893 const gdb_byte *buffer_end;
895 /* The value of the DW_AT_comp_dir attribute. */
896 const char *comp_dir;
898 /* The abbreviation table to use when reading the DIEs. */
899 struct abbrev_table *abbrev_table;
902 /* Type of function passed to init_cutu_and_read_dies, et.al. */
903 typedef void (die_reader_func_ftype) (const struct die_reader_specs *reader,
904 const gdb_byte *info_ptr,
905 struct die_info *comp_unit_die,
909 /* A 1-based directory index. This is a strong typedef to prevent
910 accidentally using a directory index as a 0-based index into an
912 enum class dir_index : unsigned int {};
914 /* Likewise, a 1-based file name index. */
915 enum class file_name_index : unsigned int {};
919 file_entry () = default;
921 file_entry (const char *name_, dir_index d_index_,
922 unsigned int mod_time_, unsigned int length_)
925 mod_time (mod_time_),
929 /* Return the include directory at D_INDEX stored in LH. Returns
930 NULL if D_INDEX is out of bounds. */
931 const char *include_dir (const line_header *lh) const;
933 /* The file name. Note this is an observing pointer. The memory is
934 owned by debug_line_buffer. */
937 /* The directory index (1-based). */
938 dir_index d_index {};
940 unsigned int mod_time {};
942 unsigned int length {};
944 /* True if referenced by the Line Number Program. */
947 /* The associated symbol table, if any. */
948 struct symtab *symtab {};
951 /* The line number information for a compilation unit (found in the
952 .debug_line section) begins with a "statement program header",
953 which contains the following information. */
960 /* Add an entry to the include directory table. */
961 void add_include_dir (const char *include_dir);
963 /* Add an entry to the file name table. */
964 void add_file_name (const char *name, dir_index d_index,
965 unsigned int mod_time, unsigned int length);
967 /* Return the include dir at INDEX (1-based). Returns NULL if INDEX
969 const char *include_dir_at (dir_index index) const
971 /* Convert directory index number (1-based) to vector index
973 size_t vec_index = to_underlying (index) - 1;
975 if (vec_index >= include_dirs.size ())
977 return include_dirs[vec_index];
980 /* Return the file name at INDEX (1-based). Returns NULL if INDEX
982 file_entry *file_name_at (file_name_index index)
984 /* Convert file name index number (1-based) to vector index
986 size_t vec_index = to_underlying (index) - 1;
988 if (vec_index >= file_names.size ())
990 return &file_names[vec_index];
993 /* Const version of the above. */
994 const file_entry *file_name_at (unsigned int index) const
996 if (index >= file_names.size ())
998 return &file_names[index];
1001 /* Offset of line number information in .debug_line section. */
1002 sect_offset sect_off {};
1004 /* OFFSET is for struct dwz_file associated with dwarf2_per_objfile. */
1005 unsigned offset_in_dwz : 1; /* Can't initialize bitfields in-class. */
1007 unsigned int total_length {};
1008 unsigned short version {};
1009 unsigned int header_length {};
1010 unsigned char minimum_instruction_length {};
1011 unsigned char maximum_ops_per_instruction {};
1012 unsigned char default_is_stmt {};
1014 unsigned char line_range {};
1015 unsigned char opcode_base {};
1017 /* standard_opcode_lengths[i] is the number of operands for the
1018 standard opcode whose value is i. This means that
1019 standard_opcode_lengths[0] is unused, and the last meaningful
1020 element is standard_opcode_lengths[opcode_base - 1]. */
1021 std::unique_ptr<unsigned char[]> standard_opcode_lengths;
1023 /* The include_directories table. Note these are observing
1024 pointers. The memory is owned by debug_line_buffer. */
1025 std::vector<const char *> include_dirs;
1027 /* The file_names table. */
1028 std::vector<file_entry> file_names;
1030 /* The start and end of the statement program following this
1031 header. These point into dwarf2_per_objfile->line_buffer. */
1032 const gdb_byte *statement_program_start {}, *statement_program_end {};
1035 typedef std::unique_ptr<line_header> line_header_up;
1038 file_entry::include_dir (const line_header *lh) const
1040 return lh->include_dir_at (d_index);
1043 /* When we construct a partial symbol table entry we only
1044 need this much information. */
1045 struct partial_die_info : public allocate_on_obstack
1047 partial_die_info (sect_offset sect_off, struct abbrev_info *abbrev);
1049 /* Disable assign but still keep copy ctor, which is needed
1050 load_partial_dies. */
1051 partial_die_info& operator=(const partial_die_info& rhs) = delete;
1053 /* Adjust the partial die before generating a symbol for it. This
1054 function may set the is_external flag or change the DIE's
1056 void fixup (struct dwarf2_cu *cu);
1058 /* Read a minimal amount of information into the minimal die
1060 const gdb_byte *read (const struct die_reader_specs *reader,
1061 const struct abbrev_info &abbrev,
1062 const gdb_byte *info_ptr);
1064 /* Offset of this DIE. */
1065 const sect_offset sect_off;
1067 /* DWARF-2 tag for this DIE. */
1068 const ENUM_BITFIELD(dwarf_tag) tag : 16;
1070 /* Assorted flags describing the data found in this DIE. */
1071 const unsigned int has_children : 1;
1073 unsigned int is_external : 1;
1074 unsigned int is_declaration : 1;
1075 unsigned int has_type : 1;
1076 unsigned int has_specification : 1;
1077 unsigned int has_pc_info : 1;
1078 unsigned int may_be_inlined : 1;
1080 /* This DIE has been marked DW_AT_main_subprogram. */
1081 unsigned int main_subprogram : 1;
1083 /* Flag set if the SCOPE field of this structure has been
1085 unsigned int scope_set : 1;
1087 /* Flag set if the DIE has a byte_size attribute. */
1088 unsigned int has_byte_size : 1;
1090 /* Flag set if the DIE has a DW_AT_const_value attribute. */
1091 unsigned int has_const_value : 1;
1093 /* Flag set if any of the DIE's children are template arguments. */
1094 unsigned int has_template_arguments : 1;
1096 /* Flag set if fixup has been called on this die. */
1097 unsigned int fixup_called : 1;
1099 /* Flag set if DW_TAG_imported_unit uses DW_FORM_GNU_ref_alt. */
1100 unsigned int is_dwz : 1;
1102 /* Flag set if spec_offset uses DW_FORM_GNU_ref_alt. */
1103 unsigned int spec_is_dwz : 1;
1105 /* The name of this DIE. Normally the value of DW_AT_name, but
1106 sometimes a default name for unnamed DIEs. */
1107 const char *name = nullptr;
1109 /* The linkage name, if present. */
1110 const char *linkage_name = nullptr;
1112 /* The scope to prepend to our children. This is generally
1113 allocated on the comp_unit_obstack, so will disappear
1114 when this compilation unit leaves the cache. */
1115 const char *scope = nullptr;
1117 /* Some data associated with the partial DIE. The tag determines
1118 which field is live. */
1121 /* The location description associated with this DIE, if any. */
1122 struct dwarf_block *locdesc;
1123 /* The offset of an import, for DW_TAG_imported_unit. */
1124 sect_offset sect_off;
1127 /* If HAS_PC_INFO, the PC range associated with this DIE. */
1128 CORE_ADDR lowpc = 0;
1129 CORE_ADDR highpc = 0;
1131 /* Pointer into the info_buffer (or types_buffer) pointing at the target of
1132 DW_AT_sibling, if any. */
1133 /* NOTE: This member isn't strictly necessary, partial_die_info::read
1134 could return DW_AT_sibling values to its caller load_partial_dies. */
1135 const gdb_byte *sibling = nullptr;
1137 /* If HAS_SPECIFICATION, the offset of the DIE referred to by
1138 DW_AT_specification (or DW_AT_abstract_origin or
1139 DW_AT_extension). */
1140 sect_offset spec_offset {};
1142 /* Pointers to this DIE's parent, first child, and next sibling,
1144 struct partial_die_info *die_parent = nullptr;
1145 struct partial_die_info *die_child = nullptr;
1146 struct partial_die_info *die_sibling = nullptr;
1148 friend struct partial_die_info *
1149 dwarf2_cu::find_partial_die (sect_offset sect_off);
1152 /* Only need to do look up in dwarf2_cu::find_partial_die. */
1153 partial_die_info (sect_offset sect_off)
1154 : partial_die_info (sect_off, DW_TAG_padding, 0)
1158 partial_die_info (sect_offset sect_off_, enum dwarf_tag tag_,
1160 : sect_off (sect_off_), tag (tag_), has_children (has_children_)
1165 has_specification = 0;
1168 main_subprogram = 0;
1171 has_const_value = 0;
1172 has_template_arguments = 0;
1179 /* This data structure holds the information of an abbrev. */
1182 unsigned int number; /* number identifying abbrev */
1183 enum dwarf_tag tag; /* dwarf tag */
1184 unsigned short has_children; /* boolean */
1185 unsigned short num_attrs; /* number of attributes */
1186 struct attr_abbrev *attrs; /* an array of attribute descriptions */
1187 struct abbrev_info *next; /* next in chain */
1192 ENUM_BITFIELD(dwarf_attribute) name : 16;
1193 ENUM_BITFIELD(dwarf_form) form : 16;
1195 /* It is valid only if FORM is DW_FORM_implicit_const. */
1196 LONGEST implicit_const;
1199 /* Size of abbrev_table.abbrev_hash_table. */
1200 #define ABBREV_HASH_SIZE 121
1202 /* Top level data structure to contain an abbreviation table. */
1206 explicit abbrev_table (sect_offset off)
1210 XOBNEWVEC (&abbrev_obstack, struct abbrev_info *, ABBREV_HASH_SIZE);
1211 memset (m_abbrevs, 0, ABBREV_HASH_SIZE * sizeof (struct abbrev_info *));
1214 DISABLE_COPY_AND_ASSIGN (abbrev_table);
1216 /* Allocate space for a struct abbrev_info object in
1218 struct abbrev_info *alloc_abbrev ();
1220 /* Add an abbreviation to the table. */
1221 void add_abbrev (unsigned int abbrev_number, struct abbrev_info *abbrev);
1223 /* Look up an abbrev in the table.
1224 Returns NULL if the abbrev is not found. */
1226 struct abbrev_info *lookup_abbrev (unsigned int abbrev_number);
1229 /* Where the abbrev table came from.
1230 This is used as a sanity check when the table is used. */
1231 const sect_offset sect_off;
1233 /* Storage for the abbrev table. */
1234 auto_obstack abbrev_obstack;
1238 /* Hash table of abbrevs.
1239 This is an array of size ABBREV_HASH_SIZE allocated in abbrev_obstack.
1240 It could be statically allocated, but the previous code didn't so we
1242 struct abbrev_info **m_abbrevs;
1245 typedef std::unique_ptr<struct abbrev_table> abbrev_table_up;
1247 /* Attributes have a name and a value. */
1250 ENUM_BITFIELD(dwarf_attribute) name : 16;
1251 ENUM_BITFIELD(dwarf_form) form : 15;
1253 /* Has DW_STRING already been updated by dwarf2_canonicalize_name? This
1254 field should be in u.str (existing only for DW_STRING) but it is kept
1255 here for better struct attribute alignment. */
1256 unsigned int string_is_canonical : 1;
1261 struct dwarf_block *blk;
1270 /* This data structure holds a complete die structure. */
1273 /* DWARF-2 tag for this DIE. */
1274 ENUM_BITFIELD(dwarf_tag) tag : 16;
1276 /* Number of attributes */
1277 unsigned char num_attrs;
1279 /* True if we're presently building the full type name for the
1280 type derived from this DIE. */
1281 unsigned char building_fullname : 1;
1283 /* True if this die is in process. PR 16581. */
1284 unsigned char in_process : 1;
1287 unsigned int abbrev;
1289 /* Offset in .debug_info or .debug_types section. */
1290 sect_offset sect_off;
1292 /* The dies in a compilation unit form an n-ary tree. PARENT
1293 points to this die's parent; CHILD points to the first child of
1294 this node; and all the children of a given node are chained
1295 together via their SIBLING fields. */
1296 struct die_info *child; /* Its first child, if any. */
1297 struct die_info *sibling; /* Its next sibling, if any. */
1298 struct die_info *parent; /* Its parent, if any. */
1300 /* An array of attributes, with NUM_ATTRS elements. There may be
1301 zero, but it's not common and zero-sized arrays are not
1302 sufficiently portable C. */
1303 struct attribute attrs[1];
1306 /* Get at parts of an attribute structure. */
1308 #define DW_STRING(attr) ((attr)->u.str)
1309 #define DW_STRING_IS_CANONICAL(attr) ((attr)->string_is_canonical)
1310 #define DW_UNSND(attr) ((attr)->u.unsnd)
1311 #define DW_BLOCK(attr) ((attr)->u.blk)
1312 #define DW_SND(attr) ((attr)->u.snd)
1313 #define DW_ADDR(attr) ((attr)->u.addr)
1314 #define DW_SIGNATURE(attr) ((attr)->u.signature)
1316 /* Blocks are a bunch of untyped bytes. */
1321 /* Valid only if SIZE is not zero. */
1322 const gdb_byte *data;
1325 #ifndef ATTR_ALLOC_CHUNK
1326 #define ATTR_ALLOC_CHUNK 4
1329 /* Allocate fields for structs, unions and enums in this size. */
1330 #ifndef DW_FIELD_ALLOC_CHUNK
1331 #define DW_FIELD_ALLOC_CHUNK 4
1334 /* FIXME: We might want to set this from BFD via bfd_arch_bits_per_byte,
1335 but this would require a corresponding change in unpack_field_as_long
1337 static int bits_per_byte = 8;
1339 /* When reading a variant or variant part, we track a bit more
1340 information about the field, and store it in an object of this
1343 struct variant_field
1345 /* If we see a DW_TAG_variant, then this will be the discriminant
1347 ULONGEST discriminant_value;
1348 /* If we see a DW_TAG_variant, then this will be set if this is the
1350 bool default_branch;
1351 /* While reading a DW_TAG_variant_part, this will be set if this
1352 field is the discriminant. */
1353 bool is_discriminant;
1358 int accessibility = 0;
1360 /* Extra information to describe a variant or variant part. */
1361 struct variant_field variant {};
1362 struct field field {};
1367 const char *name = nullptr;
1368 std::vector<struct fn_field> fnfields;
1371 /* The routines that read and process dies for a C struct or C++ class
1372 pass lists of data member fields and lists of member function fields
1373 in an instance of a field_info structure, as defined below. */
1376 /* List of data member and baseclasses fields. */
1377 std::vector<struct nextfield> fields;
1378 std::vector<struct nextfield> baseclasses;
1380 /* Number of fields (including baseclasses). */
1383 /* Set if the accesibility of one of the fields is not public. */
1384 int non_public_fields = 0;
1386 /* Member function fieldlist array, contains name of possibly overloaded
1387 member function, number of overloaded member functions and a pointer
1388 to the head of the member function field chain. */
1389 std::vector<struct fnfieldlist> fnfieldlists;
1391 /* typedefs defined inside this class. TYPEDEF_FIELD_LIST contains head of
1392 a NULL terminated list of TYPEDEF_FIELD_LIST_COUNT elements. */
1393 std::vector<struct decl_field> typedef_field_list;
1395 /* Nested types defined by this class and the number of elements in this
1397 std::vector<struct decl_field> nested_types_list;
1400 /* One item on the queue of compilation units to read in full symbols
1402 struct dwarf2_queue_item
1404 struct dwarf2_per_cu_data *per_cu;
1405 enum language pretend_language;
1406 struct dwarf2_queue_item *next;
1409 /* The current queue. */
1410 static struct dwarf2_queue_item *dwarf2_queue, *dwarf2_queue_tail;
1412 /* Loaded secondary compilation units are kept in memory until they
1413 have not been referenced for the processing of this many
1414 compilation units. Set this to zero to disable caching. Cache
1415 sizes of up to at least twenty will improve startup time for
1416 typical inter-CU-reference binaries, at an obvious memory cost. */
1417 static int dwarf_max_cache_age = 5;
1419 show_dwarf_max_cache_age (struct ui_file *file, int from_tty,
1420 struct cmd_list_element *c, const char *value)
1422 fprintf_filtered (file, _("The upper bound on the age of cached "
1423 "DWARF compilation units is %s.\n"),
1427 /* local function prototypes */
1429 static const char *get_section_name (const struct dwarf2_section_info *);
1431 static const char *get_section_file_name (const struct dwarf2_section_info *);
1433 static void dwarf2_find_base_address (struct die_info *die,
1434 struct dwarf2_cu *cu);
1436 static struct partial_symtab *create_partial_symtab
1437 (struct dwarf2_per_cu_data *per_cu, const char *name);
1439 static void build_type_psymtabs_reader (const struct die_reader_specs *reader,
1440 const gdb_byte *info_ptr,
1441 struct die_info *type_unit_die,
1442 int has_children, void *data);
1444 static void dwarf2_build_psymtabs_hard
1445 (struct dwarf2_per_objfile *dwarf2_per_objfile);
1447 static void scan_partial_symbols (struct partial_die_info *,
1448 CORE_ADDR *, CORE_ADDR *,
1449 int, struct dwarf2_cu *);
1451 static void add_partial_symbol (struct partial_die_info *,
1452 struct dwarf2_cu *);
1454 static void add_partial_namespace (struct partial_die_info *pdi,
1455 CORE_ADDR *lowpc, CORE_ADDR *highpc,
1456 int set_addrmap, struct dwarf2_cu *cu);
1458 static void add_partial_module (struct partial_die_info *pdi, CORE_ADDR *lowpc,
1459 CORE_ADDR *highpc, int set_addrmap,
1460 struct dwarf2_cu *cu);
1462 static void add_partial_enumeration (struct partial_die_info *enum_pdi,
1463 struct dwarf2_cu *cu);
1465 static void add_partial_subprogram (struct partial_die_info *pdi,
1466 CORE_ADDR *lowpc, CORE_ADDR *highpc,
1467 int need_pc, struct dwarf2_cu *cu);
1469 static void dwarf2_read_symtab (struct partial_symtab *,
1472 static void psymtab_to_symtab_1 (struct partial_symtab *);
1474 static abbrev_table_up abbrev_table_read_table
1475 (struct dwarf2_per_objfile *dwarf2_per_objfile, struct dwarf2_section_info *,
1478 static unsigned int peek_abbrev_code (bfd *, const gdb_byte *);
1480 static struct partial_die_info *load_partial_dies
1481 (const struct die_reader_specs *, const gdb_byte *, int);
1483 static struct partial_die_info *find_partial_die (sect_offset, int,
1484 struct dwarf2_cu *);
1486 static const gdb_byte *read_attribute (const struct die_reader_specs *,
1487 struct attribute *, struct attr_abbrev *,
1490 static unsigned int read_1_byte (bfd *, const gdb_byte *);
1492 static int read_1_signed_byte (bfd *, const gdb_byte *);
1494 static unsigned int read_2_bytes (bfd *, const gdb_byte *);
1496 static unsigned int read_4_bytes (bfd *, const gdb_byte *);
1498 static ULONGEST read_8_bytes (bfd *, const gdb_byte *);
1500 static CORE_ADDR read_address (bfd *, const gdb_byte *ptr, struct dwarf2_cu *,
1503 static LONGEST read_initial_length (bfd *, const gdb_byte *, unsigned int *);
1505 static LONGEST read_checked_initial_length_and_offset
1506 (bfd *, const gdb_byte *, const struct comp_unit_head *,
1507 unsigned int *, unsigned int *);
1509 static LONGEST read_offset (bfd *, const gdb_byte *,
1510 const struct comp_unit_head *,
1513 static LONGEST read_offset_1 (bfd *, const gdb_byte *, unsigned int);
1515 static sect_offset read_abbrev_offset
1516 (struct dwarf2_per_objfile *dwarf2_per_objfile,
1517 struct dwarf2_section_info *, sect_offset);
1519 static const gdb_byte *read_n_bytes (bfd *, const gdb_byte *, unsigned int);
1521 static const char *read_direct_string (bfd *, const gdb_byte *, unsigned int *);
1523 static const char *read_indirect_string
1524 (struct dwarf2_per_objfile *dwarf2_per_objfile, bfd *, const gdb_byte *,
1525 const struct comp_unit_head *, unsigned int *);
1527 static const char *read_indirect_line_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_string_at_offset
1532 (struct dwarf2_per_objfile *dwarf2_per_objfile, bfd *abfd,
1533 LONGEST str_offset);
1535 static const char *read_indirect_string_from_dwz
1536 (struct objfile *objfile, struct dwz_file *, LONGEST);
1538 static LONGEST read_signed_leb128 (bfd *, const gdb_byte *, unsigned int *);
1540 static CORE_ADDR read_addr_index_from_leb128 (struct dwarf2_cu *,
1544 static const char *read_str_index (const struct die_reader_specs *reader,
1545 ULONGEST str_index);
1547 static void set_cu_language (unsigned int, struct dwarf2_cu *);
1549 static struct attribute *dwarf2_attr (struct die_info *, unsigned int,
1550 struct dwarf2_cu *);
1552 static struct attribute *dwarf2_attr_no_follow (struct die_info *,
1555 static const char *dwarf2_string_attr (struct die_info *die, unsigned int name,
1556 struct dwarf2_cu *cu);
1558 static int dwarf2_flag_true_p (struct die_info *die, unsigned name,
1559 struct dwarf2_cu *cu);
1561 static int die_is_declaration (struct die_info *, struct dwarf2_cu *cu);
1563 static struct die_info *die_specification (struct die_info *die,
1564 struct dwarf2_cu **);
1566 static line_header_up dwarf_decode_line_header (sect_offset sect_off,
1567 struct dwarf2_cu *cu);
1569 static void dwarf_decode_lines (struct line_header *, const char *,
1570 struct dwarf2_cu *, struct partial_symtab *,
1571 CORE_ADDR, int decode_mapping);
1573 static void dwarf2_start_subfile (const char *, const char *);
1575 static struct compunit_symtab *dwarf2_start_symtab (struct dwarf2_cu *,
1576 const char *, const char *,
1579 static struct symbol *new_symbol (struct die_info *, struct type *,
1580 struct dwarf2_cu *, struct symbol * = NULL);
1582 static void dwarf2_const_value (const struct attribute *, struct symbol *,
1583 struct dwarf2_cu *);
1585 static void dwarf2_const_value_attr (const struct attribute *attr,
1588 struct obstack *obstack,
1589 struct dwarf2_cu *cu, LONGEST *value,
1590 const gdb_byte **bytes,
1591 struct dwarf2_locexpr_baton **baton);
1593 static struct type *die_type (struct die_info *, struct dwarf2_cu *);
1595 static int need_gnat_info (struct dwarf2_cu *);
1597 static struct type *die_descriptive_type (struct die_info *,
1598 struct dwarf2_cu *);
1600 static void set_descriptive_type (struct type *, struct die_info *,
1601 struct dwarf2_cu *);
1603 static struct type *die_containing_type (struct die_info *,
1604 struct dwarf2_cu *);
1606 static struct type *lookup_die_type (struct die_info *, const struct attribute *,
1607 struct dwarf2_cu *);
1609 static struct type *read_type_die (struct die_info *, struct dwarf2_cu *);
1611 static struct type *read_type_die_1 (struct die_info *, struct dwarf2_cu *);
1613 static const char *determine_prefix (struct die_info *die, struct dwarf2_cu *);
1615 static char *typename_concat (struct obstack *obs, const char *prefix,
1616 const char *suffix, int physname,
1617 struct dwarf2_cu *cu);
1619 static void read_file_scope (struct die_info *, struct dwarf2_cu *);
1621 static void read_type_unit_scope (struct die_info *, struct dwarf2_cu *);
1623 static void read_func_scope (struct die_info *, struct dwarf2_cu *);
1625 static void read_lexical_block_scope (struct die_info *, struct dwarf2_cu *);
1627 static void read_call_site_scope (struct die_info *die, struct dwarf2_cu *cu);
1629 static void read_variable (struct die_info *die, struct dwarf2_cu *cu);
1631 static int dwarf2_ranges_read (unsigned, CORE_ADDR *, CORE_ADDR *,
1632 struct dwarf2_cu *, struct partial_symtab *);
1634 /* How dwarf2_get_pc_bounds constructed its *LOWPC and *HIGHPC return
1635 values. Keep the items ordered with increasing constraints compliance. */
1638 /* No attribute DW_AT_low_pc, DW_AT_high_pc or DW_AT_ranges was found. */
1639 PC_BOUNDS_NOT_PRESENT,
1641 /* Some of the attributes DW_AT_low_pc, DW_AT_high_pc or DW_AT_ranges
1642 were present but they do not form a valid range of PC addresses. */
1645 /* Discontiguous range was found - that is DW_AT_ranges was found. */
1648 /* Contiguous range was found - DW_AT_low_pc and DW_AT_high_pc were found. */
1652 static enum pc_bounds_kind dwarf2_get_pc_bounds (struct die_info *,
1653 CORE_ADDR *, CORE_ADDR *,
1655 struct partial_symtab *);
1657 static void get_scope_pc_bounds (struct die_info *,
1658 CORE_ADDR *, CORE_ADDR *,
1659 struct dwarf2_cu *);
1661 static void dwarf2_record_block_ranges (struct die_info *, struct block *,
1662 CORE_ADDR, struct dwarf2_cu *);
1664 static void dwarf2_add_field (struct field_info *, struct die_info *,
1665 struct dwarf2_cu *);
1667 static void dwarf2_attach_fields_to_type (struct field_info *,
1668 struct type *, struct dwarf2_cu *);
1670 static void dwarf2_add_member_fn (struct field_info *,
1671 struct die_info *, struct type *,
1672 struct dwarf2_cu *);
1674 static void dwarf2_attach_fn_fields_to_type (struct field_info *,
1676 struct dwarf2_cu *);
1678 static void process_structure_scope (struct die_info *, struct dwarf2_cu *);
1680 static void read_common_block (struct die_info *, struct dwarf2_cu *);
1682 static void read_namespace (struct die_info *die, struct dwarf2_cu *);
1684 static void read_module (struct die_info *die, struct dwarf2_cu *cu);
1686 static struct using_direct **using_directives (enum language);
1688 static void read_import_statement (struct die_info *die, struct dwarf2_cu *);
1690 static int read_namespace_alias (struct die_info *die, struct dwarf2_cu *cu);
1692 static struct type *read_module_type (struct die_info *die,
1693 struct dwarf2_cu *cu);
1695 static const char *namespace_name (struct die_info *die,
1696 int *is_anonymous, struct dwarf2_cu *);
1698 static void process_enumeration_scope (struct die_info *, struct dwarf2_cu *);
1700 static CORE_ADDR decode_locdesc (struct dwarf_block *, struct dwarf2_cu *);
1702 static enum dwarf_array_dim_ordering read_array_order (struct die_info *,
1703 struct dwarf2_cu *);
1705 static struct die_info *read_die_and_siblings_1
1706 (const struct die_reader_specs *, const gdb_byte *, const gdb_byte **,
1709 static struct die_info *read_die_and_siblings (const struct die_reader_specs *,
1710 const gdb_byte *info_ptr,
1711 const gdb_byte **new_info_ptr,
1712 struct die_info *parent);
1714 static const gdb_byte *read_full_die_1 (const struct die_reader_specs *,
1715 struct die_info **, const gdb_byte *,
1718 static const gdb_byte *read_full_die (const struct die_reader_specs *,
1719 struct die_info **, const gdb_byte *,
1722 static void process_die (struct die_info *, struct dwarf2_cu *);
1724 static const char *dwarf2_canonicalize_name (const char *, struct dwarf2_cu *,
1727 static const char *dwarf2_name (struct die_info *die, struct dwarf2_cu *);
1729 static const char *dwarf2_full_name (const char *name,
1730 struct die_info *die,
1731 struct dwarf2_cu *cu);
1733 static const char *dwarf2_physname (const char *name, struct die_info *die,
1734 struct dwarf2_cu *cu);
1736 static struct die_info *dwarf2_extension (struct die_info *die,
1737 struct dwarf2_cu **);
1739 static const char *dwarf_tag_name (unsigned int);
1741 static const char *dwarf_attr_name (unsigned int);
1743 static const char *dwarf_form_name (unsigned int);
1745 static const char *dwarf_bool_name (unsigned int);
1747 static const char *dwarf_type_encoding_name (unsigned int);
1749 static struct die_info *sibling_die (struct die_info *);
1751 static void dump_die_shallow (struct ui_file *, int indent, struct die_info *);
1753 static void dump_die_for_error (struct die_info *);
1755 static void dump_die_1 (struct ui_file *, int level, int max_level,
1758 /*static*/ void dump_die (struct die_info *, int max_level);
1760 static void store_in_ref_table (struct die_info *,
1761 struct dwarf2_cu *);
1763 static sect_offset dwarf2_get_ref_die_offset (const struct attribute *);
1765 static LONGEST dwarf2_get_attr_constant_value (const struct attribute *, int);
1767 static struct die_info *follow_die_ref_or_sig (struct die_info *,
1768 const struct attribute *,
1769 struct dwarf2_cu **);
1771 static struct die_info *follow_die_ref (struct die_info *,
1772 const struct attribute *,
1773 struct dwarf2_cu **);
1775 static struct die_info *follow_die_sig (struct die_info *,
1776 const struct attribute *,
1777 struct dwarf2_cu **);
1779 static struct type *get_signatured_type (struct die_info *, ULONGEST,
1780 struct dwarf2_cu *);
1782 static struct type *get_DW_AT_signature_type (struct die_info *,
1783 const struct attribute *,
1784 struct dwarf2_cu *);
1786 static void load_full_type_unit (struct dwarf2_per_cu_data *per_cu);
1788 static void read_signatured_type (struct signatured_type *);
1790 static int attr_to_dynamic_prop (const struct attribute *attr,
1791 struct die_info *die, struct dwarf2_cu *cu,
1792 struct dynamic_prop *prop);
1794 /* memory allocation interface */
1796 static struct dwarf_block *dwarf_alloc_block (struct dwarf2_cu *);
1798 static struct die_info *dwarf_alloc_die (struct dwarf2_cu *, int);
1800 static void dwarf_decode_macros (struct dwarf2_cu *, unsigned int, int);
1802 static int attr_form_is_block (const struct attribute *);
1804 static int attr_form_is_section_offset (const struct attribute *);
1806 static int attr_form_is_constant (const struct attribute *);
1808 static int attr_form_is_ref (const struct attribute *);
1810 static void fill_in_loclist_baton (struct dwarf2_cu *cu,
1811 struct dwarf2_loclist_baton *baton,
1812 const struct attribute *attr);
1814 static void dwarf2_symbol_mark_computed (const struct attribute *attr,
1816 struct dwarf2_cu *cu,
1819 static const gdb_byte *skip_one_die (const struct die_reader_specs *reader,
1820 const gdb_byte *info_ptr,
1821 struct abbrev_info *abbrev);
1823 static hashval_t partial_die_hash (const void *item);
1825 static int partial_die_eq (const void *item_lhs, const void *item_rhs);
1827 static struct dwarf2_per_cu_data *dwarf2_find_containing_comp_unit
1828 (sect_offset sect_off, unsigned int offset_in_dwz,
1829 struct dwarf2_per_objfile *dwarf2_per_objfile);
1831 static void prepare_one_comp_unit (struct dwarf2_cu *cu,
1832 struct die_info *comp_unit_die,
1833 enum language pretend_language);
1835 static void age_cached_comp_units (struct dwarf2_per_objfile *dwarf2_per_objfile);
1837 static void free_one_cached_comp_unit (struct dwarf2_per_cu_data *);
1839 static struct type *set_die_type (struct die_info *, struct type *,
1840 struct dwarf2_cu *);
1842 static void create_all_comp_units (struct dwarf2_per_objfile *dwarf2_per_objfile);
1844 static int create_all_type_units (struct dwarf2_per_objfile *dwarf2_per_objfile);
1846 static void load_full_comp_unit (struct dwarf2_per_cu_data *, bool,
1849 static void process_full_comp_unit (struct dwarf2_per_cu_data *,
1852 static void process_full_type_unit (struct dwarf2_per_cu_data *,
1855 static void dwarf2_add_dependence (struct dwarf2_cu *,
1856 struct dwarf2_per_cu_data *);
1858 static void dwarf2_mark (struct dwarf2_cu *);
1860 static void dwarf2_clear_marks (struct dwarf2_per_cu_data *);
1862 static struct type *get_die_type_at_offset (sect_offset,
1863 struct dwarf2_per_cu_data *);
1865 static struct type *get_die_type (struct die_info *die, struct dwarf2_cu *cu);
1867 static void queue_comp_unit (struct dwarf2_per_cu_data *per_cu,
1868 enum language pretend_language);
1870 static void process_queue (struct dwarf2_per_objfile *dwarf2_per_objfile);
1872 /* Class, the destructor of which frees all allocated queue entries. This
1873 will only have work to do if an error was thrown while processing the
1874 dwarf. If no error was thrown then the queue entries should have all
1875 been processed, and freed, as we went along. */
1877 class dwarf2_queue_guard
1880 dwarf2_queue_guard () = default;
1882 /* Free any entries remaining on the queue. There should only be
1883 entries left if we hit an error while processing the dwarf. */
1884 ~dwarf2_queue_guard ()
1886 struct dwarf2_queue_item *item, *last;
1888 item = dwarf2_queue;
1891 /* Anything still marked queued is likely to be in an
1892 inconsistent state, so discard it. */
1893 if (item->per_cu->queued)
1895 if (item->per_cu->cu != NULL)
1896 free_one_cached_comp_unit (item->per_cu);
1897 item->per_cu->queued = 0;
1905 dwarf2_queue = dwarf2_queue_tail = NULL;
1909 /* The return type of find_file_and_directory. Note, the enclosed
1910 string pointers are only valid while this object is valid. */
1912 struct file_and_directory
1914 /* The filename. This is never NULL. */
1917 /* The compilation directory. NULL if not known. If we needed to
1918 compute a new string, this points to COMP_DIR_STORAGE, otherwise,
1919 points directly to the DW_AT_comp_dir string attribute owned by
1920 the obstack that owns the DIE. */
1921 const char *comp_dir;
1923 /* If we needed to build a new string for comp_dir, this is what
1924 owns the storage. */
1925 std::string comp_dir_storage;
1928 static file_and_directory find_file_and_directory (struct die_info *die,
1929 struct dwarf2_cu *cu);
1931 static char *file_full_name (int file, struct line_header *lh,
1932 const char *comp_dir);
1934 /* Expected enum dwarf_unit_type for read_comp_unit_head. */
1935 enum class rcuh_kind { COMPILE, TYPE };
1937 static const gdb_byte *read_and_check_comp_unit_head
1938 (struct dwarf2_per_objfile* dwarf2_per_objfile,
1939 struct comp_unit_head *header,
1940 struct dwarf2_section_info *section,
1941 struct dwarf2_section_info *abbrev_section, const gdb_byte *info_ptr,
1942 rcuh_kind section_kind);
1944 static void init_cutu_and_read_dies
1945 (struct dwarf2_per_cu_data *this_cu, struct abbrev_table *abbrev_table,
1946 int use_existing_cu, int keep, bool skip_partial,
1947 die_reader_func_ftype *die_reader_func, void *data);
1949 static void init_cutu_and_read_dies_simple
1950 (struct dwarf2_per_cu_data *this_cu,
1951 die_reader_func_ftype *die_reader_func, void *data);
1953 static htab_t allocate_signatured_type_table (struct objfile *objfile);
1955 static htab_t allocate_dwo_unit_table (struct objfile *objfile);
1957 static struct dwo_unit *lookup_dwo_unit_in_dwp
1958 (struct dwarf2_per_objfile *dwarf2_per_objfile,
1959 struct dwp_file *dwp_file, const char *comp_dir,
1960 ULONGEST signature, int is_debug_types);
1962 static struct dwp_file *get_dwp_file
1963 (struct dwarf2_per_objfile *dwarf2_per_objfile);
1965 static struct dwo_unit *lookup_dwo_comp_unit
1966 (struct dwarf2_per_cu_data *, const char *, const char *, ULONGEST);
1968 static struct dwo_unit *lookup_dwo_type_unit
1969 (struct signatured_type *, const char *, const char *);
1971 static void queue_and_load_all_dwo_tus (struct dwarf2_per_cu_data *);
1973 static void free_dwo_file (struct dwo_file *);
1975 /* A unique_ptr helper to free a dwo_file. */
1977 struct dwo_file_deleter
1979 void operator() (struct dwo_file *df) const
1985 /* A unique pointer to a dwo_file. */
1987 typedef std::unique_ptr<struct dwo_file, dwo_file_deleter> dwo_file_up;
1989 static void process_cu_includes (struct dwarf2_per_objfile *dwarf2_per_objfile);
1991 static void check_producer (struct dwarf2_cu *cu);
1993 static void free_line_header_voidp (void *arg);
1995 /* Various complaints about symbol reading that don't abort the process. */
1998 dwarf2_statement_list_fits_in_line_number_section_complaint (void)
2000 complaint (_("statement list doesn't fit in .debug_line section"));
2004 dwarf2_debug_line_missing_file_complaint (void)
2006 complaint (_(".debug_line section has line data without a file"));
2010 dwarf2_debug_line_missing_end_sequence_complaint (void)
2012 complaint (_(".debug_line section has line "
2013 "program sequence without an end"));
2017 dwarf2_complex_location_expr_complaint (void)
2019 complaint (_("location expression too complex"));
2023 dwarf2_const_value_length_mismatch_complaint (const char *arg1, int arg2,
2026 complaint (_("const value length mismatch for '%s', got %d, expected %d"),
2031 dwarf2_section_buffer_overflow_complaint (struct dwarf2_section_info *section)
2033 complaint (_("debug info runs off end of %s section"
2035 get_section_name (section),
2036 get_section_file_name (section));
2040 dwarf2_macro_malformed_definition_complaint (const char *arg1)
2042 complaint (_("macro debug info contains a "
2043 "malformed macro definition:\n`%s'"),
2048 dwarf2_invalid_attrib_class_complaint (const char *arg1, const char *arg2)
2050 complaint (_("invalid attribute class or form for '%s' in '%s'"),
2054 /* Hash function for line_header_hash. */
2057 line_header_hash (const struct line_header *ofs)
2059 return to_underlying (ofs->sect_off) ^ ofs->offset_in_dwz;
2062 /* Hash function for htab_create_alloc_ex for line_header_hash. */
2065 line_header_hash_voidp (const void *item)
2067 const struct line_header *ofs = (const struct line_header *) item;
2069 return line_header_hash (ofs);
2072 /* Equality function for line_header_hash. */
2075 line_header_eq_voidp (const void *item_lhs, const void *item_rhs)
2077 const struct line_header *ofs_lhs = (const struct line_header *) item_lhs;
2078 const struct line_header *ofs_rhs = (const struct line_header *) item_rhs;
2080 return (ofs_lhs->sect_off == ofs_rhs->sect_off
2081 && ofs_lhs->offset_in_dwz == ofs_rhs->offset_in_dwz);
2086 /* Read the given attribute value as an address, taking the attribute's
2087 form into account. */
2090 attr_value_as_address (struct attribute *attr)
2094 if (attr->form != DW_FORM_addr && attr->form != DW_FORM_GNU_addr_index)
2096 /* Aside from a few clearly defined exceptions, attributes that
2097 contain an address must always be in DW_FORM_addr form.
2098 Unfortunately, some compilers happen to be violating this
2099 requirement by encoding addresses using other forms, such
2100 as DW_FORM_data4 for example. For those broken compilers,
2101 we try to do our best, without any guarantee of success,
2102 to interpret the address correctly. It would also be nice
2103 to generate a complaint, but that would require us to maintain
2104 a list of legitimate cases where a non-address form is allowed,
2105 as well as update callers to pass in at least the CU's DWARF
2106 version. This is more overhead than what we're willing to
2107 expand for a pretty rare case. */
2108 addr = DW_UNSND (attr);
2111 addr = DW_ADDR (attr);
2116 /* See declaration. */
2118 dwarf2_per_objfile::dwarf2_per_objfile (struct objfile *objfile_,
2119 const dwarf2_debug_sections *names)
2120 : objfile (objfile_)
2123 names = &dwarf2_elf_names;
2125 bfd *obfd = objfile->obfd;
2127 for (asection *sec = obfd->sections; sec != NULL; sec = sec->next)
2128 locate_sections (obfd, sec, *names);
2131 static void free_dwo_files (htab_t dwo_files, struct objfile *objfile);
2133 dwarf2_per_objfile::~dwarf2_per_objfile ()
2135 /* Cached DIE trees use xmalloc and the comp_unit_obstack. */
2136 free_cached_comp_units ();
2138 if (quick_file_names_table)
2139 htab_delete (quick_file_names_table);
2141 if (line_header_hash)
2142 htab_delete (line_header_hash);
2144 for (dwarf2_per_cu_data *per_cu : all_comp_units)
2145 VEC_free (dwarf2_per_cu_ptr, per_cu->imported_symtabs);
2147 for (signatured_type *sig_type : all_type_units)
2148 VEC_free (dwarf2_per_cu_ptr, sig_type->per_cu.imported_symtabs);
2150 VEC_free (dwarf2_section_info_def, types);
2152 if (dwo_files != NULL)
2153 free_dwo_files (dwo_files, objfile);
2155 /* Everything else should be on the objfile obstack. */
2158 /* See declaration. */
2161 dwarf2_per_objfile::free_cached_comp_units ()
2163 dwarf2_per_cu_data *per_cu = read_in_chain;
2164 dwarf2_per_cu_data **last_chain = &read_in_chain;
2165 while (per_cu != NULL)
2167 dwarf2_per_cu_data *next_cu = per_cu->cu->read_in_chain;
2170 *last_chain = next_cu;
2175 /* A helper class that calls free_cached_comp_units on
2178 class free_cached_comp_units
2182 explicit free_cached_comp_units (dwarf2_per_objfile *per_objfile)
2183 : m_per_objfile (per_objfile)
2187 ~free_cached_comp_units ()
2189 m_per_objfile->free_cached_comp_units ();
2192 DISABLE_COPY_AND_ASSIGN (free_cached_comp_units);
2196 dwarf2_per_objfile *m_per_objfile;
2199 /* Try to locate the sections we need for DWARF 2 debugging
2200 information and return true if we have enough to do something.
2201 NAMES points to the dwarf2 section names, or is NULL if the standard
2202 ELF names are used. */
2205 dwarf2_has_info (struct objfile *objfile,
2206 const struct dwarf2_debug_sections *names)
2208 if (objfile->flags & OBJF_READNEVER)
2211 struct dwarf2_per_objfile *dwarf2_per_objfile
2212 = get_dwarf2_per_objfile (objfile);
2214 if (dwarf2_per_objfile == NULL)
2216 /* Initialize per-objfile state. */
2218 = new (&objfile->objfile_obstack) struct dwarf2_per_objfile (objfile,
2220 set_dwarf2_per_objfile (objfile, dwarf2_per_objfile);
2222 return (!dwarf2_per_objfile->info.is_virtual
2223 && dwarf2_per_objfile->info.s.section != NULL
2224 && !dwarf2_per_objfile->abbrev.is_virtual
2225 && dwarf2_per_objfile->abbrev.s.section != NULL);
2228 /* Return the containing section of virtual section SECTION. */
2230 static struct dwarf2_section_info *
2231 get_containing_section (const struct dwarf2_section_info *section)
2233 gdb_assert (section->is_virtual);
2234 return section->s.containing_section;
2237 /* Return the bfd owner of SECTION. */
2240 get_section_bfd_owner (const struct dwarf2_section_info *section)
2242 if (section->is_virtual)
2244 section = get_containing_section (section);
2245 gdb_assert (!section->is_virtual);
2247 return section->s.section->owner;
2250 /* Return the bfd section of SECTION.
2251 Returns NULL if the section is not present. */
2254 get_section_bfd_section (const struct dwarf2_section_info *section)
2256 if (section->is_virtual)
2258 section = get_containing_section (section);
2259 gdb_assert (!section->is_virtual);
2261 return section->s.section;
2264 /* Return the name of SECTION. */
2267 get_section_name (const struct dwarf2_section_info *section)
2269 asection *sectp = get_section_bfd_section (section);
2271 gdb_assert (sectp != NULL);
2272 return bfd_section_name (get_section_bfd_owner (section), sectp);
2275 /* Return the name of the file SECTION is in. */
2278 get_section_file_name (const struct dwarf2_section_info *section)
2280 bfd *abfd = get_section_bfd_owner (section);
2282 return bfd_get_filename (abfd);
2285 /* Return the id of SECTION.
2286 Returns 0 if SECTION doesn't exist. */
2289 get_section_id (const struct dwarf2_section_info *section)
2291 asection *sectp = get_section_bfd_section (section);
2298 /* Return the flags of SECTION.
2299 SECTION (or containing section if this is a virtual section) must exist. */
2302 get_section_flags (const struct dwarf2_section_info *section)
2304 asection *sectp = get_section_bfd_section (section);
2306 gdb_assert (sectp != NULL);
2307 return bfd_get_section_flags (sectp->owner, sectp);
2310 /* When loading sections, we look either for uncompressed section or for
2311 compressed section names. */
2314 section_is_p (const char *section_name,
2315 const struct dwarf2_section_names *names)
2317 if (names->normal != NULL
2318 && strcmp (section_name, names->normal) == 0)
2320 if (names->compressed != NULL
2321 && strcmp (section_name, names->compressed) == 0)
2326 /* See declaration. */
2329 dwarf2_per_objfile::locate_sections (bfd *abfd, asection *sectp,
2330 const dwarf2_debug_sections &names)
2332 flagword aflag = bfd_get_section_flags (abfd, sectp);
2334 if ((aflag & SEC_HAS_CONTENTS) == 0)
2337 else if (section_is_p (sectp->name, &names.info))
2339 this->info.s.section = sectp;
2340 this->info.size = bfd_get_section_size (sectp);
2342 else if (section_is_p (sectp->name, &names.abbrev))
2344 this->abbrev.s.section = sectp;
2345 this->abbrev.size = bfd_get_section_size (sectp);
2347 else if (section_is_p (sectp->name, &names.line))
2349 this->line.s.section = sectp;
2350 this->line.size = bfd_get_section_size (sectp);
2352 else if (section_is_p (sectp->name, &names.loc))
2354 this->loc.s.section = sectp;
2355 this->loc.size = bfd_get_section_size (sectp);
2357 else if (section_is_p (sectp->name, &names.loclists))
2359 this->loclists.s.section = sectp;
2360 this->loclists.size = bfd_get_section_size (sectp);
2362 else if (section_is_p (sectp->name, &names.macinfo))
2364 this->macinfo.s.section = sectp;
2365 this->macinfo.size = bfd_get_section_size (sectp);
2367 else if (section_is_p (sectp->name, &names.macro))
2369 this->macro.s.section = sectp;
2370 this->macro.size = bfd_get_section_size (sectp);
2372 else if (section_is_p (sectp->name, &names.str))
2374 this->str.s.section = sectp;
2375 this->str.size = bfd_get_section_size (sectp);
2377 else if (section_is_p (sectp->name, &names.line_str))
2379 this->line_str.s.section = sectp;
2380 this->line_str.size = bfd_get_section_size (sectp);
2382 else if (section_is_p (sectp->name, &names.addr))
2384 this->addr.s.section = sectp;
2385 this->addr.size = bfd_get_section_size (sectp);
2387 else if (section_is_p (sectp->name, &names.frame))
2389 this->frame.s.section = sectp;
2390 this->frame.size = bfd_get_section_size (sectp);
2392 else if (section_is_p (sectp->name, &names.eh_frame))
2394 this->eh_frame.s.section = sectp;
2395 this->eh_frame.size = bfd_get_section_size (sectp);
2397 else if (section_is_p (sectp->name, &names.ranges))
2399 this->ranges.s.section = sectp;
2400 this->ranges.size = bfd_get_section_size (sectp);
2402 else if (section_is_p (sectp->name, &names.rnglists))
2404 this->rnglists.s.section = sectp;
2405 this->rnglists.size = bfd_get_section_size (sectp);
2407 else if (section_is_p (sectp->name, &names.types))
2409 struct dwarf2_section_info type_section;
2411 memset (&type_section, 0, sizeof (type_section));
2412 type_section.s.section = sectp;
2413 type_section.size = bfd_get_section_size (sectp);
2415 VEC_safe_push (dwarf2_section_info_def, this->types,
2418 else if (section_is_p (sectp->name, &names.gdb_index))
2420 this->gdb_index.s.section = sectp;
2421 this->gdb_index.size = bfd_get_section_size (sectp);
2423 else if (section_is_p (sectp->name, &names.debug_names))
2425 this->debug_names.s.section = sectp;
2426 this->debug_names.size = bfd_get_section_size (sectp);
2428 else if (section_is_p (sectp->name, &names.debug_aranges))
2430 this->debug_aranges.s.section = sectp;
2431 this->debug_aranges.size = bfd_get_section_size (sectp);
2434 if ((bfd_get_section_flags (abfd, sectp) & (SEC_LOAD | SEC_ALLOC))
2435 && bfd_section_vma (abfd, sectp) == 0)
2436 this->has_section_at_zero = true;
2439 /* A helper function that decides whether a section is empty,
2443 dwarf2_section_empty_p (const struct dwarf2_section_info *section)
2445 if (section->is_virtual)
2446 return section->size == 0;
2447 return section->s.section == NULL || section->size == 0;
2450 /* See dwarf2read.h. */
2453 dwarf2_read_section (struct objfile *objfile, dwarf2_section_info *info)
2457 gdb_byte *buf, *retbuf;
2461 info->buffer = NULL;
2464 if (dwarf2_section_empty_p (info))
2467 sectp = get_section_bfd_section (info);
2469 /* If this is a virtual section we need to read in the real one first. */
2470 if (info->is_virtual)
2472 struct dwarf2_section_info *containing_section =
2473 get_containing_section (info);
2475 gdb_assert (sectp != NULL);
2476 if ((sectp->flags & SEC_RELOC) != 0)
2478 error (_("Dwarf Error: DWP format V2 with relocations is not"
2479 " supported in section %s [in module %s]"),
2480 get_section_name (info), get_section_file_name (info));
2482 dwarf2_read_section (objfile, containing_section);
2483 /* Other code should have already caught virtual sections that don't
2485 gdb_assert (info->virtual_offset + info->size
2486 <= containing_section->size);
2487 /* If the real section is empty or there was a problem reading the
2488 section we shouldn't get here. */
2489 gdb_assert (containing_section->buffer != NULL);
2490 info->buffer = containing_section->buffer + info->virtual_offset;
2494 /* If the section has relocations, we must read it ourselves.
2495 Otherwise we attach it to the BFD. */
2496 if ((sectp->flags & SEC_RELOC) == 0)
2498 info->buffer = gdb_bfd_map_section (sectp, &info->size);
2502 buf = (gdb_byte *) obstack_alloc (&objfile->objfile_obstack, info->size);
2505 /* When debugging .o files, we may need to apply relocations; see
2506 http://sourceware.org/ml/gdb-patches/2002-04/msg00136.html .
2507 We never compress sections in .o files, so we only need to
2508 try this when the section is not compressed. */
2509 retbuf = symfile_relocate_debug_section (objfile, sectp, buf);
2512 info->buffer = retbuf;
2516 abfd = get_section_bfd_owner (info);
2517 gdb_assert (abfd != NULL);
2519 if (bfd_seek (abfd, sectp->filepos, SEEK_SET) != 0
2520 || bfd_bread (buf, info->size, abfd) != info->size)
2522 error (_("Dwarf Error: Can't read DWARF data"
2523 " in section %s [in module %s]"),
2524 bfd_section_name (abfd, sectp), bfd_get_filename (abfd));
2528 /* A helper function that returns the size of a section in a safe way.
2529 If you are positive that the section has been read before using the
2530 size, then it is safe to refer to the dwarf2_section_info object's
2531 "size" field directly. In other cases, you must call this
2532 function, because for compressed sections the size field is not set
2533 correctly until the section has been read. */
2535 static bfd_size_type
2536 dwarf2_section_size (struct objfile *objfile,
2537 struct dwarf2_section_info *info)
2540 dwarf2_read_section (objfile, info);
2544 /* Fill in SECTP, BUFP and SIZEP with section info, given OBJFILE and
2548 dwarf2_get_section_info (struct objfile *objfile,
2549 enum dwarf2_section_enum sect,
2550 asection **sectp, const gdb_byte **bufp,
2551 bfd_size_type *sizep)
2553 struct dwarf2_per_objfile *data
2554 = (struct dwarf2_per_objfile *) objfile_data (objfile,
2555 dwarf2_objfile_data_key);
2556 struct dwarf2_section_info *info;
2558 /* We may see an objfile without any DWARF, in which case we just
2569 case DWARF2_DEBUG_FRAME:
2570 info = &data->frame;
2572 case DWARF2_EH_FRAME:
2573 info = &data->eh_frame;
2576 gdb_assert_not_reached ("unexpected section");
2579 dwarf2_read_section (objfile, info);
2581 *sectp = get_section_bfd_section (info);
2582 *bufp = info->buffer;
2583 *sizep = info->size;
2586 /* A helper function to find the sections for a .dwz file. */
2589 locate_dwz_sections (bfd *abfd, asection *sectp, void *arg)
2591 struct dwz_file *dwz_file = (struct dwz_file *) arg;
2593 /* Note that we only support the standard ELF names, because .dwz
2594 is ELF-only (at the time of writing). */
2595 if (section_is_p (sectp->name, &dwarf2_elf_names.abbrev))
2597 dwz_file->abbrev.s.section = sectp;
2598 dwz_file->abbrev.size = bfd_get_section_size (sectp);
2600 else if (section_is_p (sectp->name, &dwarf2_elf_names.info))
2602 dwz_file->info.s.section = sectp;
2603 dwz_file->info.size = bfd_get_section_size (sectp);
2605 else if (section_is_p (sectp->name, &dwarf2_elf_names.str))
2607 dwz_file->str.s.section = sectp;
2608 dwz_file->str.size = bfd_get_section_size (sectp);
2610 else if (section_is_p (sectp->name, &dwarf2_elf_names.line))
2612 dwz_file->line.s.section = sectp;
2613 dwz_file->line.size = bfd_get_section_size (sectp);
2615 else if (section_is_p (sectp->name, &dwarf2_elf_names.macro))
2617 dwz_file->macro.s.section = sectp;
2618 dwz_file->macro.size = bfd_get_section_size (sectp);
2620 else if (section_is_p (sectp->name, &dwarf2_elf_names.gdb_index))
2622 dwz_file->gdb_index.s.section = sectp;
2623 dwz_file->gdb_index.size = bfd_get_section_size (sectp);
2625 else if (section_is_p (sectp->name, &dwarf2_elf_names.debug_names))
2627 dwz_file->debug_names.s.section = sectp;
2628 dwz_file->debug_names.size = bfd_get_section_size (sectp);
2632 /* Open the separate '.dwz' debug file, if needed. Return NULL if
2633 there is no .gnu_debugaltlink section in the file. Error if there
2634 is such a section but the file cannot be found. */
2636 static struct dwz_file *
2637 dwarf2_get_dwz_file (struct dwarf2_per_objfile *dwarf2_per_objfile)
2639 const char *filename;
2640 bfd_size_type buildid_len_arg;
2644 if (dwarf2_per_objfile->dwz_file != NULL)
2645 return dwarf2_per_objfile->dwz_file.get ();
2647 bfd_set_error (bfd_error_no_error);
2648 gdb::unique_xmalloc_ptr<char> data
2649 (bfd_get_alt_debug_link_info (dwarf2_per_objfile->objfile->obfd,
2650 &buildid_len_arg, &buildid));
2653 if (bfd_get_error () == bfd_error_no_error)
2655 error (_("could not read '.gnu_debugaltlink' section: %s"),
2656 bfd_errmsg (bfd_get_error ()));
2659 gdb::unique_xmalloc_ptr<bfd_byte> buildid_holder (buildid);
2661 buildid_len = (size_t) buildid_len_arg;
2663 filename = data.get ();
2665 std::string abs_storage;
2666 if (!IS_ABSOLUTE_PATH (filename))
2668 gdb::unique_xmalloc_ptr<char> abs
2669 = gdb_realpath (objfile_name (dwarf2_per_objfile->objfile));
2671 abs_storage = ldirname (abs.get ()) + SLASH_STRING + filename;
2672 filename = abs_storage.c_str ();
2675 /* First try the file name given in the section. If that doesn't
2676 work, try to use the build-id instead. */
2677 gdb_bfd_ref_ptr dwz_bfd (gdb_bfd_open (filename, gnutarget, -1));
2678 if (dwz_bfd != NULL)
2680 if (!build_id_verify (dwz_bfd.get (), buildid_len, buildid))
2684 if (dwz_bfd == NULL)
2685 dwz_bfd = build_id_to_debug_bfd (buildid_len, buildid);
2687 if (dwz_bfd == NULL)
2688 error (_("could not find '.gnu_debugaltlink' file for %s"),
2689 objfile_name (dwarf2_per_objfile->objfile));
2691 std::unique_ptr<struct dwz_file> result
2692 (new struct dwz_file (std::move (dwz_bfd)));
2694 bfd_map_over_sections (result->dwz_bfd.get (), locate_dwz_sections,
2697 gdb_bfd_record_inclusion (dwarf2_per_objfile->objfile->obfd,
2698 result->dwz_bfd.get ());
2699 dwarf2_per_objfile->dwz_file = std::move (result);
2700 return dwarf2_per_objfile->dwz_file.get ();
2703 /* DWARF quick_symbols_functions support. */
2705 /* TUs can share .debug_line entries, and there can be a lot more TUs than
2706 unique line tables, so we maintain a separate table of all .debug_line
2707 derived entries to support the sharing.
2708 All the quick functions need is the list of file names. We discard the
2709 line_header when we're done and don't need to record it here. */
2710 struct quick_file_names
2712 /* The data used to construct the hash key. */
2713 struct stmt_list_hash hash;
2715 /* The number of entries in file_names, real_names. */
2716 unsigned int num_file_names;
2718 /* The file names from the line table, after being run through
2720 const char **file_names;
2722 /* The file names from the line table after being run through
2723 gdb_realpath. These are computed lazily. */
2724 const char **real_names;
2727 /* When using the index (and thus not using psymtabs), each CU has an
2728 object of this type. This is used to hold information needed by
2729 the various "quick" methods. */
2730 struct dwarf2_per_cu_quick_data
2732 /* The file table. This can be NULL if there was no file table
2733 or it's currently not read in.
2734 NOTE: This points into dwarf2_per_objfile->quick_file_names_table. */
2735 struct quick_file_names *file_names;
2737 /* The corresponding symbol table. This is NULL if symbols for this
2738 CU have not yet been read. */
2739 struct compunit_symtab *compunit_symtab;
2741 /* A temporary mark bit used when iterating over all CUs in
2742 expand_symtabs_matching. */
2743 unsigned int mark : 1;
2745 /* True if we've tried to read the file table and found there isn't one.
2746 There will be no point in trying to read it again next time. */
2747 unsigned int no_file_data : 1;
2750 /* Utility hash function for a stmt_list_hash. */
2753 hash_stmt_list_entry (const struct stmt_list_hash *stmt_list_hash)
2757 if (stmt_list_hash->dwo_unit != NULL)
2758 v += (uintptr_t) stmt_list_hash->dwo_unit->dwo_file;
2759 v += to_underlying (stmt_list_hash->line_sect_off);
2763 /* Utility equality function for a stmt_list_hash. */
2766 eq_stmt_list_entry (const struct stmt_list_hash *lhs,
2767 const struct stmt_list_hash *rhs)
2769 if ((lhs->dwo_unit != NULL) != (rhs->dwo_unit != NULL))
2771 if (lhs->dwo_unit != NULL
2772 && lhs->dwo_unit->dwo_file != rhs->dwo_unit->dwo_file)
2775 return lhs->line_sect_off == rhs->line_sect_off;
2778 /* Hash function for a quick_file_names. */
2781 hash_file_name_entry (const void *e)
2783 const struct quick_file_names *file_data
2784 = (const struct quick_file_names *) e;
2786 return hash_stmt_list_entry (&file_data->hash);
2789 /* Equality function for a quick_file_names. */
2792 eq_file_name_entry (const void *a, const void *b)
2794 const struct quick_file_names *ea = (const struct quick_file_names *) a;
2795 const struct quick_file_names *eb = (const struct quick_file_names *) b;
2797 return eq_stmt_list_entry (&ea->hash, &eb->hash);
2800 /* Delete function for a quick_file_names. */
2803 delete_file_name_entry (void *e)
2805 struct quick_file_names *file_data = (struct quick_file_names *) e;
2808 for (i = 0; i < file_data->num_file_names; ++i)
2810 xfree ((void*) file_data->file_names[i]);
2811 if (file_data->real_names)
2812 xfree ((void*) file_data->real_names[i]);
2815 /* The space for the struct itself lives on objfile_obstack,
2816 so we don't free it here. */
2819 /* Create a quick_file_names hash table. */
2822 create_quick_file_names_table (unsigned int nr_initial_entries)
2824 return htab_create_alloc (nr_initial_entries,
2825 hash_file_name_entry, eq_file_name_entry,
2826 delete_file_name_entry, xcalloc, xfree);
2829 /* Read in PER_CU->CU. This function is unrelated to symtabs, symtab would
2830 have to be created afterwards. You should call age_cached_comp_units after
2831 processing PER_CU->CU. dw2_setup must have been already called. */
2834 load_cu (struct dwarf2_per_cu_data *per_cu, bool skip_partial)
2836 if (per_cu->is_debug_types)
2837 load_full_type_unit (per_cu);
2839 load_full_comp_unit (per_cu, skip_partial, language_minimal);
2841 if (per_cu->cu == NULL)
2842 return; /* Dummy CU. */
2844 dwarf2_find_base_address (per_cu->cu->dies, per_cu->cu);
2847 /* Read in the symbols for PER_CU. */
2850 dw2_do_instantiate_symtab (struct dwarf2_per_cu_data *per_cu, bool skip_partial)
2852 struct dwarf2_per_objfile *dwarf2_per_objfile = per_cu->dwarf2_per_objfile;
2854 /* Skip type_unit_groups, reading the type units they contain
2855 is handled elsewhere. */
2856 if (IS_TYPE_UNIT_GROUP (per_cu))
2859 /* The destructor of dwarf2_queue_guard frees any entries left on
2860 the queue. After this point we're guaranteed to leave this function
2861 with the dwarf queue empty. */
2862 dwarf2_queue_guard q_guard;
2864 if (dwarf2_per_objfile->using_index
2865 ? per_cu->v.quick->compunit_symtab == NULL
2866 : (per_cu->v.psymtab == NULL || !per_cu->v.psymtab->readin))
2868 queue_comp_unit (per_cu, language_minimal);
2869 load_cu (per_cu, skip_partial);
2871 /* If we just loaded a CU from a DWO, and we're working with an index
2872 that may badly handle TUs, load all the TUs in that DWO as well.
2873 http://sourceware.org/bugzilla/show_bug.cgi?id=15021 */
2874 if (!per_cu->is_debug_types
2875 && per_cu->cu != NULL
2876 && per_cu->cu->dwo_unit != NULL
2877 && dwarf2_per_objfile->index_table != NULL
2878 && dwarf2_per_objfile->index_table->version <= 7
2879 /* DWP files aren't supported yet. */
2880 && get_dwp_file (dwarf2_per_objfile) == NULL)
2881 queue_and_load_all_dwo_tus (per_cu);
2884 process_queue (dwarf2_per_objfile);
2886 /* Age the cache, releasing compilation units that have not
2887 been used recently. */
2888 age_cached_comp_units (dwarf2_per_objfile);
2891 /* Ensure that the symbols for PER_CU have been read in. OBJFILE is
2892 the objfile from which this CU came. Returns the resulting symbol
2895 static struct compunit_symtab *
2896 dw2_instantiate_symtab (struct dwarf2_per_cu_data *per_cu, bool skip_partial)
2898 struct dwarf2_per_objfile *dwarf2_per_objfile = per_cu->dwarf2_per_objfile;
2900 gdb_assert (dwarf2_per_objfile->using_index);
2901 if (!per_cu->v.quick->compunit_symtab)
2903 free_cached_comp_units freer (dwarf2_per_objfile);
2904 scoped_restore decrementer = increment_reading_symtab ();
2905 dw2_do_instantiate_symtab (per_cu, skip_partial);
2906 process_cu_includes (dwarf2_per_objfile);
2909 return per_cu->v.quick->compunit_symtab;
2912 /* See declaration. */
2914 dwarf2_per_cu_data *
2915 dwarf2_per_objfile::get_cutu (int index)
2917 if (index >= this->all_comp_units.size ())
2919 index -= this->all_comp_units.size ();
2920 gdb_assert (index < this->all_type_units.size ());
2921 return &this->all_type_units[index]->per_cu;
2924 return this->all_comp_units[index];
2927 /* See declaration. */
2929 dwarf2_per_cu_data *
2930 dwarf2_per_objfile::get_cu (int index)
2932 gdb_assert (index >= 0 && index < this->all_comp_units.size ());
2934 return this->all_comp_units[index];
2937 /* See declaration. */
2940 dwarf2_per_objfile::get_tu (int index)
2942 gdb_assert (index >= 0 && index < this->all_type_units.size ());
2944 return this->all_type_units[index];
2947 /* Return a new dwarf2_per_cu_data allocated on OBJFILE's
2948 objfile_obstack, and constructed with the specified field
2951 static dwarf2_per_cu_data *
2952 create_cu_from_index_list (struct dwarf2_per_objfile *dwarf2_per_objfile,
2953 struct dwarf2_section_info *section,
2955 sect_offset sect_off, ULONGEST length)
2957 struct objfile *objfile = dwarf2_per_objfile->objfile;
2958 dwarf2_per_cu_data *the_cu
2959 = OBSTACK_ZALLOC (&objfile->objfile_obstack,
2960 struct dwarf2_per_cu_data);
2961 the_cu->sect_off = sect_off;
2962 the_cu->length = length;
2963 the_cu->dwarf2_per_objfile = dwarf2_per_objfile;
2964 the_cu->section = section;
2965 the_cu->v.quick = OBSTACK_ZALLOC (&objfile->objfile_obstack,
2966 struct dwarf2_per_cu_quick_data);
2967 the_cu->is_dwz = is_dwz;
2971 /* A helper for create_cus_from_index that handles a given list of
2975 create_cus_from_index_list (struct dwarf2_per_objfile *dwarf2_per_objfile,
2976 const gdb_byte *cu_list, offset_type n_elements,
2977 struct dwarf2_section_info *section,
2980 for (offset_type i = 0; i < n_elements; i += 2)
2982 gdb_static_assert (sizeof (ULONGEST) >= 8);
2984 sect_offset sect_off
2985 = (sect_offset) extract_unsigned_integer (cu_list, 8, BFD_ENDIAN_LITTLE);
2986 ULONGEST length = extract_unsigned_integer (cu_list + 8, 8, BFD_ENDIAN_LITTLE);
2989 dwarf2_per_cu_data *per_cu
2990 = create_cu_from_index_list (dwarf2_per_objfile, section, is_dwz,
2992 dwarf2_per_objfile->all_comp_units.push_back (per_cu);
2996 /* Read the CU list from the mapped index, and use it to create all
2997 the CU objects for this objfile. */
3000 create_cus_from_index (struct dwarf2_per_objfile *dwarf2_per_objfile,
3001 const gdb_byte *cu_list, offset_type cu_list_elements,
3002 const gdb_byte *dwz_list, offset_type dwz_elements)
3004 gdb_assert (dwarf2_per_objfile->all_comp_units.empty ());
3005 dwarf2_per_objfile->all_comp_units.reserve
3006 ((cu_list_elements + dwz_elements) / 2);
3008 create_cus_from_index_list (dwarf2_per_objfile, cu_list, cu_list_elements,
3009 &dwarf2_per_objfile->info, 0);
3011 if (dwz_elements == 0)
3014 dwz_file *dwz = dwarf2_get_dwz_file (dwarf2_per_objfile);
3015 create_cus_from_index_list (dwarf2_per_objfile, dwz_list, dwz_elements,
3019 /* Create the signatured type hash table from the index. */
3022 create_signatured_type_table_from_index
3023 (struct dwarf2_per_objfile *dwarf2_per_objfile,
3024 struct dwarf2_section_info *section,
3025 const gdb_byte *bytes,
3026 offset_type elements)
3028 struct objfile *objfile = dwarf2_per_objfile->objfile;
3030 gdb_assert (dwarf2_per_objfile->all_type_units.empty ());
3031 dwarf2_per_objfile->all_type_units.reserve (elements / 3);
3033 htab_t sig_types_hash = allocate_signatured_type_table (objfile);
3035 for (offset_type i = 0; i < elements; i += 3)
3037 struct signatured_type *sig_type;
3040 cu_offset type_offset_in_tu;
3042 gdb_static_assert (sizeof (ULONGEST) >= 8);
3043 sect_offset sect_off
3044 = (sect_offset) extract_unsigned_integer (bytes, 8, BFD_ENDIAN_LITTLE);
3046 = (cu_offset) extract_unsigned_integer (bytes + 8, 8,
3048 signature = extract_unsigned_integer (bytes + 16, 8, BFD_ENDIAN_LITTLE);
3051 sig_type = OBSTACK_ZALLOC (&objfile->objfile_obstack,
3052 struct signatured_type);
3053 sig_type->signature = signature;
3054 sig_type->type_offset_in_tu = type_offset_in_tu;
3055 sig_type->per_cu.is_debug_types = 1;
3056 sig_type->per_cu.section = section;
3057 sig_type->per_cu.sect_off = sect_off;
3058 sig_type->per_cu.dwarf2_per_objfile = dwarf2_per_objfile;
3059 sig_type->per_cu.v.quick
3060 = OBSTACK_ZALLOC (&objfile->objfile_obstack,
3061 struct dwarf2_per_cu_quick_data);
3063 slot = htab_find_slot (sig_types_hash, sig_type, INSERT);
3066 dwarf2_per_objfile->all_type_units.push_back (sig_type);
3069 dwarf2_per_objfile->signatured_types = sig_types_hash;
3072 /* Create the signatured type hash table from .debug_names. */
3075 create_signatured_type_table_from_debug_names
3076 (struct dwarf2_per_objfile *dwarf2_per_objfile,
3077 const mapped_debug_names &map,
3078 struct dwarf2_section_info *section,
3079 struct dwarf2_section_info *abbrev_section)
3081 struct objfile *objfile = dwarf2_per_objfile->objfile;
3083 dwarf2_read_section (objfile, section);
3084 dwarf2_read_section (objfile, abbrev_section);
3086 gdb_assert (dwarf2_per_objfile->all_type_units.empty ());
3087 dwarf2_per_objfile->all_type_units.reserve (map.tu_count);
3089 htab_t sig_types_hash = allocate_signatured_type_table (objfile);
3091 for (uint32_t i = 0; i < map.tu_count; ++i)
3093 struct signatured_type *sig_type;
3096 sect_offset sect_off
3097 = (sect_offset) (extract_unsigned_integer
3098 (map.tu_table_reordered + i * map.offset_size,
3100 map.dwarf5_byte_order));
3102 comp_unit_head cu_header;
3103 read_and_check_comp_unit_head (dwarf2_per_objfile, &cu_header, section,
3105 section->buffer + to_underlying (sect_off),
3108 sig_type = OBSTACK_ZALLOC (&objfile->objfile_obstack,
3109 struct signatured_type);
3110 sig_type->signature = cu_header.signature;
3111 sig_type->type_offset_in_tu = cu_header.type_cu_offset_in_tu;
3112 sig_type->per_cu.is_debug_types = 1;
3113 sig_type->per_cu.section = section;
3114 sig_type->per_cu.sect_off = sect_off;
3115 sig_type->per_cu.dwarf2_per_objfile = dwarf2_per_objfile;
3116 sig_type->per_cu.v.quick
3117 = OBSTACK_ZALLOC (&objfile->objfile_obstack,
3118 struct dwarf2_per_cu_quick_data);
3120 slot = htab_find_slot (sig_types_hash, sig_type, INSERT);
3123 dwarf2_per_objfile->all_type_units.push_back (sig_type);
3126 dwarf2_per_objfile->signatured_types = sig_types_hash;
3129 /* Read the address map data from the mapped index, and use it to
3130 populate the objfile's psymtabs_addrmap. */
3133 create_addrmap_from_index (struct dwarf2_per_objfile *dwarf2_per_objfile,
3134 struct mapped_index *index)
3136 struct objfile *objfile = dwarf2_per_objfile->objfile;
3137 struct gdbarch *gdbarch = get_objfile_arch (objfile);
3138 const gdb_byte *iter, *end;
3139 struct addrmap *mutable_map;
3142 auto_obstack temp_obstack;
3144 mutable_map = addrmap_create_mutable (&temp_obstack);
3146 iter = index->address_table.data ();
3147 end = iter + index->address_table.size ();
3149 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
3153 ULONGEST hi, lo, cu_index;
3154 lo = extract_unsigned_integer (iter, 8, BFD_ENDIAN_LITTLE);
3156 hi = extract_unsigned_integer (iter, 8, BFD_ENDIAN_LITTLE);
3158 cu_index = extract_unsigned_integer (iter, 4, BFD_ENDIAN_LITTLE);
3163 complaint (_(".gdb_index address table has invalid range (%s - %s)"),
3164 hex_string (lo), hex_string (hi));
3168 if (cu_index >= dwarf2_per_objfile->all_comp_units.size ())
3170 complaint (_(".gdb_index address table has invalid CU number %u"),
3171 (unsigned) cu_index);
3175 lo = gdbarch_adjust_dwarf2_addr (gdbarch, lo + baseaddr);
3176 hi = gdbarch_adjust_dwarf2_addr (gdbarch, hi + baseaddr);
3177 addrmap_set_empty (mutable_map, lo, hi - 1,
3178 dwarf2_per_objfile->get_cu (cu_index));
3181 objfile->psymtabs_addrmap = addrmap_create_fixed (mutable_map,
3182 &objfile->objfile_obstack);
3185 /* Read the address map data from DWARF-5 .debug_aranges, and use it to
3186 populate the objfile's psymtabs_addrmap. */
3189 create_addrmap_from_aranges (struct dwarf2_per_objfile *dwarf2_per_objfile,
3190 struct dwarf2_section_info *section)
3192 struct objfile *objfile = dwarf2_per_objfile->objfile;
3193 bfd *abfd = objfile->obfd;
3194 struct gdbarch *gdbarch = get_objfile_arch (objfile);
3195 const CORE_ADDR baseaddr = ANOFFSET (objfile->section_offsets,
3196 SECT_OFF_TEXT (objfile));
3198 auto_obstack temp_obstack;
3199 addrmap *mutable_map = addrmap_create_mutable (&temp_obstack);
3201 std::unordered_map<sect_offset,
3202 dwarf2_per_cu_data *,
3203 gdb::hash_enum<sect_offset>>
3204 debug_info_offset_to_per_cu;
3205 for (dwarf2_per_cu_data *per_cu : dwarf2_per_objfile->all_comp_units)
3207 const auto insertpair
3208 = debug_info_offset_to_per_cu.emplace (per_cu->sect_off, per_cu);
3209 if (!insertpair.second)
3211 warning (_("Section .debug_aranges in %s has duplicate "
3212 "debug_info_offset %s, ignoring .debug_aranges."),
3213 objfile_name (objfile), sect_offset_str (per_cu->sect_off));
3218 dwarf2_read_section (objfile, section);
3220 const bfd_endian dwarf5_byte_order = gdbarch_byte_order (gdbarch);
3222 const gdb_byte *addr = section->buffer;
3224 while (addr < section->buffer + section->size)
3226 const gdb_byte *const entry_addr = addr;
3227 unsigned int bytes_read;
3229 const LONGEST entry_length = read_initial_length (abfd, addr,
3233 const gdb_byte *const entry_end = addr + entry_length;
3234 const bool dwarf5_is_dwarf64 = bytes_read != 4;
3235 const uint8_t offset_size = dwarf5_is_dwarf64 ? 8 : 4;
3236 if (addr + entry_length > section->buffer + section->size)
3238 warning (_("Section .debug_aranges in %s entry at offset %zu "
3239 "length %s exceeds section length %s, "
3240 "ignoring .debug_aranges."),
3241 objfile_name (objfile), entry_addr - section->buffer,
3242 plongest (bytes_read + entry_length),
3243 pulongest (section->size));
3247 /* The version number. */
3248 const uint16_t version = read_2_bytes (abfd, addr);
3252 warning (_("Section .debug_aranges in %s entry at offset %zu "
3253 "has unsupported version %d, ignoring .debug_aranges."),
3254 objfile_name (objfile), entry_addr - section->buffer,
3259 const uint64_t debug_info_offset
3260 = extract_unsigned_integer (addr, offset_size, dwarf5_byte_order);
3261 addr += offset_size;
3262 const auto per_cu_it
3263 = debug_info_offset_to_per_cu.find (sect_offset (debug_info_offset));
3264 if (per_cu_it == debug_info_offset_to_per_cu.cend ())
3266 warning (_("Section .debug_aranges in %s entry at offset %zu "
3267 "debug_info_offset %s does not exists, "
3268 "ignoring .debug_aranges."),
3269 objfile_name (objfile), entry_addr - section->buffer,
3270 pulongest (debug_info_offset));
3273 dwarf2_per_cu_data *const per_cu = per_cu_it->second;
3275 const uint8_t address_size = *addr++;
3276 if (address_size < 1 || address_size > 8)
3278 warning (_("Section .debug_aranges in %s entry at offset %zu "
3279 "address_size %u is invalid, ignoring .debug_aranges."),
3280 objfile_name (objfile), entry_addr - section->buffer,
3285 const uint8_t segment_selector_size = *addr++;
3286 if (segment_selector_size != 0)
3288 warning (_("Section .debug_aranges in %s entry at offset %zu "
3289 "segment_selector_size %u is not supported, "
3290 "ignoring .debug_aranges."),
3291 objfile_name (objfile), entry_addr - section->buffer,
3292 segment_selector_size);
3296 /* Must pad to an alignment boundary that is twice the address
3297 size. It is undocumented by the DWARF standard but GCC does
3299 for (size_t padding = ((-(addr - section->buffer))
3300 & (2 * address_size - 1));
3301 padding > 0; padding--)
3304 warning (_("Section .debug_aranges in %s entry at offset %zu "
3305 "padding is not zero, ignoring .debug_aranges."),
3306 objfile_name (objfile), entry_addr - section->buffer);
3312 if (addr + 2 * address_size > entry_end)
3314 warning (_("Section .debug_aranges in %s entry at offset %zu "
3315 "address list is not properly terminated, "
3316 "ignoring .debug_aranges."),
3317 objfile_name (objfile), entry_addr - section->buffer);
3320 ULONGEST start = extract_unsigned_integer (addr, address_size,
3322 addr += address_size;
3323 ULONGEST length = extract_unsigned_integer (addr, address_size,
3325 addr += address_size;
3326 if (start == 0 && length == 0)
3328 if (start == 0 && !dwarf2_per_objfile->has_section_at_zero)
3330 /* Symbol was eliminated due to a COMDAT group. */
3333 ULONGEST end = start + length;
3334 start = gdbarch_adjust_dwarf2_addr (gdbarch, start + baseaddr);
3335 end = gdbarch_adjust_dwarf2_addr (gdbarch, end + baseaddr);
3336 addrmap_set_empty (mutable_map, start, end - 1, per_cu);
3340 objfile->psymtabs_addrmap = addrmap_create_fixed (mutable_map,
3341 &objfile->objfile_obstack);
3344 /* Find a slot in the mapped index INDEX for the object named NAME.
3345 If NAME is found, set *VEC_OUT to point to the CU vector in the
3346 constant pool and return true. If NAME cannot be found, return
3350 find_slot_in_mapped_hash (struct mapped_index *index, const char *name,
3351 offset_type **vec_out)
3354 offset_type slot, step;
3355 int (*cmp) (const char *, const char *);
3357 gdb::unique_xmalloc_ptr<char> without_params;
3358 if (current_language->la_language == language_cplus
3359 || current_language->la_language == language_fortran
3360 || current_language->la_language == language_d)
3362 /* NAME is already canonical. Drop any qualifiers as .gdb_index does
3365 if (strchr (name, '(') != NULL)
3367 without_params = cp_remove_params (name);
3369 if (without_params != NULL)
3370 name = without_params.get ();
3374 /* Index version 4 did not support case insensitive searches. But the
3375 indices for case insensitive languages are built in lowercase, therefore
3376 simulate our NAME being searched is also lowercased. */
3377 hash = mapped_index_string_hash ((index->version == 4
3378 && case_sensitivity == case_sensitive_off
3379 ? 5 : index->version),
3382 slot = hash & (index->symbol_table.size () - 1);
3383 step = ((hash * 17) & (index->symbol_table.size () - 1)) | 1;
3384 cmp = (case_sensitivity == case_sensitive_on ? strcmp : strcasecmp);
3390 const auto &bucket = index->symbol_table[slot];
3391 if (bucket.name == 0 && bucket.vec == 0)
3394 str = index->constant_pool + MAYBE_SWAP (bucket.name);
3395 if (!cmp (name, str))
3397 *vec_out = (offset_type *) (index->constant_pool
3398 + MAYBE_SWAP (bucket.vec));
3402 slot = (slot + step) & (index->symbol_table.size () - 1);
3406 /* A helper function that reads the .gdb_index from SECTION and fills
3407 in MAP. FILENAME is the name of the file containing the section;
3408 it is used for error reporting. DEPRECATED_OK is true if it is
3409 ok to use deprecated sections.
3411 CU_LIST, CU_LIST_ELEMENTS, TYPES_LIST, and TYPES_LIST_ELEMENTS are
3412 out parameters that are filled in with information about the CU and
3413 TU lists in the section.
3415 Returns 1 if all went well, 0 otherwise. */
3418 read_gdb_index_from_section (struct objfile *objfile,
3419 const char *filename,
3421 struct dwarf2_section_info *section,
3422 struct mapped_index *map,
3423 const gdb_byte **cu_list,
3424 offset_type *cu_list_elements,
3425 const gdb_byte **types_list,
3426 offset_type *types_list_elements)
3428 const gdb_byte *addr;
3429 offset_type version;
3430 offset_type *metadata;
3433 if (dwarf2_section_empty_p (section))
3436 /* Older elfutils strip versions could keep the section in the main
3437 executable while splitting it for the separate debug info file. */
3438 if ((get_section_flags (section) & SEC_HAS_CONTENTS) == 0)
3441 dwarf2_read_section (objfile, section);
3443 addr = section->buffer;
3444 /* Version check. */
3445 version = MAYBE_SWAP (*(offset_type *) addr);
3446 /* Versions earlier than 3 emitted every copy of a psymbol. This
3447 causes the index to behave very poorly for certain requests. Version 3
3448 contained incomplete addrmap. So, it seems better to just ignore such
3452 static int warning_printed = 0;
3453 if (!warning_printed)
3455 warning (_("Skipping obsolete .gdb_index section in %s."),
3457 warning_printed = 1;
3461 /* Index version 4 uses a different hash function than index version
3464 Versions earlier than 6 did not emit psymbols for inlined
3465 functions. Using these files will cause GDB not to be able to
3466 set breakpoints on inlined functions by name, so we ignore these
3467 indices unless the user has done
3468 "set use-deprecated-index-sections on". */
3469 if (version < 6 && !deprecated_ok)
3471 static int warning_printed = 0;
3472 if (!warning_printed)
3475 Skipping deprecated .gdb_index section in %s.\n\
3476 Do \"set use-deprecated-index-sections on\" before the file is read\n\
3477 to use the section anyway."),
3479 warning_printed = 1;
3483 /* Version 7 indices generated by gold refer to the CU for a symbol instead
3484 of the TU (for symbols coming from TUs),
3485 http://sourceware.org/bugzilla/show_bug.cgi?id=15021.
3486 Plus gold-generated indices can have duplicate entries for global symbols,
3487 http://sourceware.org/bugzilla/show_bug.cgi?id=15646.
3488 These are just performance bugs, and we can't distinguish gdb-generated
3489 indices from gold-generated ones, so issue no warning here. */
3491 /* Indexes with higher version than the one supported by GDB may be no
3492 longer backward compatible. */
3496 map->version = version;
3498 metadata = (offset_type *) (addr + sizeof (offset_type));
3501 *cu_list = addr + MAYBE_SWAP (metadata[i]);
3502 *cu_list_elements = ((MAYBE_SWAP (metadata[i + 1]) - MAYBE_SWAP (metadata[i]))
3506 *types_list = addr + MAYBE_SWAP (metadata[i]);
3507 *types_list_elements = ((MAYBE_SWAP (metadata[i + 1])
3508 - MAYBE_SWAP (metadata[i]))
3512 const gdb_byte *address_table = addr + MAYBE_SWAP (metadata[i]);
3513 const gdb_byte *address_table_end = addr + MAYBE_SWAP (metadata[i + 1]);
3515 = gdb::array_view<const gdb_byte> (address_table, address_table_end);
3518 const gdb_byte *symbol_table = addr + MAYBE_SWAP (metadata[i]);
3519 const gdb_byte *symbol_table_end = addr + MAYBE_SWAP (metadata[i + 1]);
3521 = gdb::array_view<mapped_index::symbol_table_slot>
3522 ((mapped_index::symbol_table_slot *) symbol_table,
3523 (mapped_index::symbol_table_slot *) symbol_table_end);
3526 map->constant_pool = (char *) (addr + MAYBE_SWAP (metadata[i]));
3531 /* Read .gdb_index. If everything went ok, initialize the "quick"
3532 elements of all the CUs and return 1. Otherwise, return 0. */
3535 dwarf2_read_gdb_index (struct dwarf2_per_objfile *dwarf2_per_objfile)
3537 const gdb_byte *cu_list, *types_list, *dwz_list = NULL;
3538 offset_type cu_list_elements, types_list_elements, dwz_list_elements = 0;
3539 struct dwz_file *dwz;
3540 struct objfile *objfile = dwarf2_per_objfile->objfile;
3542 std::unique_ptr<struct mapped_index> map (new struct mapped_index);
3543 if (!read_gdb_index_from_section (objfile, objfile_name (objfile),
3544 use_deprecated_index_sections,
3545 &dwarf2_per_objfile->gdb_index, map.get (),
3546 &cu_list, &cu_list_elements,
3547 &types_list, &types_list_elements))
3550 /* Don't use the index if it's empty. */
3551 if (map->symbol_table.empty ())
3554 /* If there is a .dwz file, read it so we can get its CU list as
3556 dwz = dwarf2_get_dwz_file (dwarf2_per_objfile);
3559 struct mapped_index dwz_map;
3560 const gdb_byte *dwz_types_ignore;
3561 offset_type dwz_types_elements_ignore;
3563 if (!read_gdb_index_from_section (objfile,
3564 bfd_get_filename (dwz->dwz_bfd), 1,
3565 &dwz->gdb_index, &dwz_map,
3566 &dwz_list, &dwz_list_elements,
3568 &dwz_types_elements_ignore))
3570 warning (_("could not read '.gdb_index' section from %s; skipping"),
3571 bfd_get_filename (dwz->dwz_bfd));
3576 create_cus_from_index (dwarf2_per_objfile, cu_list, cu_list_elements,
3577 dwz_list, dwz_list_elements);
3579 if (types_list_elements)
3581 struct dwarf2_section_info *section;
3583 /* We can only handle a single .debug_types when we have an
3585 if (VEC_length (dwarf2_section_info_def, dwarf2_per_objfile->types) != 1)
3588 section = VEC_index (dwarf2_section_info_def,
3589 dwarf2_per_objfile->types, 0);
3591 create_signatured_type_table_from_index (dwarf2_per_objfile, section,
3592 types_list, types_list_elements);
3595 create_addrmap_from_index (dwarf2_per_objfile, map.get ());
3597 dwarf2_per_objfile->index_table = std::move (map);
3598 dwarf2_per_objfile->using_index = 1;
3599 dwarf2_per_objfile->quick_file_names_table =
3600 create_quick_file_names_table (dwarf2_per_objfile->all_comp_units.size ());
3605 /* die_reader_func for dw2_get_file_names. */
3608 dw2_get_file_names_reader (const struct die_reader_specs *reader,
3609 const gdb_byte *info_ptr,
3610 struct die_info *comp_unit_die,
3614 struct dwarf2_cu *cu = reader->cu;
3615 struct dwarf2_per_cu_data *this_cu = cu->per_cu;
3616 struct dwarf2_per_objfile *dwarf2_per_objfile
3617 = cu->per_cu->dwarf2_per_objfile;
3618 struct objfile *objfile = dwarf2_per_objfile->objfile;
3619 struct dwarf2_per_cu_data *lh_cu;
3620 struct attribute *attr;
3623 struct quick_file_names *qfn;
3625 gdb_assert (! this_cu->is_debug_types);
3627 /* Our callers never want to match partial units -- instead they
3628 will match the enclosing full CU. */
3629 if (comp_unit_die->tag == DW_TAG_partial_unit)
3631 this_cu->v.quick->no_file_data = 1;
3639 sect_offset line_offset {};
3641 attr = dwarf2_attr (comp_unit_die, DW_AT_stmt_list, cu);
3644 struct quick_file_names find_entry;
3646 line_offset = (sect_offset) DW_UNSND (attr);
3648 /* We may have already read in this line header (TU line header sharing).
3649 If we have we're done. */
3650 find_entry.hash.dwo_unit = cu->dwo_unit;
3651 find_entry.hash.line_sect_off = line_offset;
3652 slot = htab_find_slot (dwarf2_per_objfile->quick_file_names_table,
3653 &find_entry, INSERT);
3656 lh_cu->v.quick->file_names = (struct quick_file_names *) *slot;
3660 lh = dwarf_decode_line_header (line_offset, cu);
3664 lh_cu->v.quick->no_file_data = 1;
3668 qfn = XOBNEW (&objfile->objfile_obstack, struct quick_file_names);
3669 qfn->hash.dwo_unit = cu->dwo_unit;
3670 qfn->hash.line_sect_off = line_offset;
3671 gdb_assert (slot != NULL);
3674 file_and_directory fnd = find_file_and_directory (comp_unit_die, cu);
3676 qfn->num_file_names = lh->file_names.size ();
3678 XOBNEWVEC (&objfile->objfile_obstack, const char *, lh->file_names.size ());
3679 for (i = 0; i < lh->file_names.size (); ++i)
3680 qfn->file_names[i] = file_full_name (i + 1, lh.get (), fnd.comp_dir);
3681 qfn->real_names = NULL;
3683 lh_cu->v.quick->file_names = qfn;
3686 /* A helper for the "quick" functions which attempts to read the line
3687 table for THIS_CU. */
3689 static struct quick_file_names *
3690 dw2_get_file_names (struct dwarf2_per_cu_data *this_cu)
3692 /* This should never be called for TUs. */
3693 gdb_assert (! this_cu->is_debug_types);
3694 /* Nor type unit groups. */
3695 gdb_assert (! IS_TYPE_UNIT_GROUP (this_cu));
3697 if (this_cu->v.quick->file_names != NULL)
3698 return this_cu->v.quick->file_names;
3699 /* If we know there is no line data, no point in looking again. */
3700 if (this_cu->v.quick->no_file_data)
3703 init_cutu_and_read_dies_simple (this_cu, dw2_get_file_names_reader, NULL);
3705 if (this_cu->v.quick->no_file_data)
3707 return this_cu->v.quick->file_names;
3710 /* A helper for the "quick" functions which computes and caches the
3711 real path for a given file name from the line table. */
3714 dw2_get_real_path (struct objfile *objfile,
3715 struct quick_file_names *qfn, int index)
3717 if (qfn->real_names == NULL)
3718 qfn->real_names = OBSTACK_CALLOC (&objfile->objfile_obstack,
3719 qfn->num_file_names, const char *);
3721 if (qfn->real_names[index] == NULL)
3722 qfn->real_names[index] = gdb_realpath (qfn->file_names[index]).release ();
3724 return qfn->real_names[index];
3727 static struct symtab *
3728 dw2_find_last_source_symtab (struct objfile *objfile)
3730 struct dwarf2_per_objfile *dwarf2_per_objfile
3731 = get_dwarf2_per_objfile (objfile);
3732 dwarf2_per_cu_data *dwarf_cu = dwarf2_per_objfile->all_comp_units.back ();
3733 compunit_symtab *cust = dw2_instantiate_symtab (dwarf_cu, false);
3738 return compunit_primary_filetab (cust);
3741 /* Traversal function for dw2_forget_cached_source_info. */
3744 dw2_free_cached_file_names (void **slot, void *info)
3746 struct quick_file_names *file_data = (struct quick_file_names *) *slot;
3748 if (file_data->real_names)
3752 for (i = 0; i < file_data->num_file_names; ++i)
3754 xfree ((void*) file_data->real_names[i]);
3755 file_data->real_names[i] = NULL;
3763 dw2_forget_cached_source_info (struct objfile *objfile)
3765 struct dwarf2_per_objfile *dwarf2_per_objfile
3766 = get_dwarf2_per_objfile (objfile);
3768 htab_traverse_noresize (dwarf2_per_objfile->quick_file_names_table,
3769 dw2_free_cached_file_names, NULL);
3772 /* Helper function for dw2_map_symtabs_matching_filename that expands
3773 the symtabs and calls the iterator. */
3776 dw2_map_expand_apply (struct objfile *objfile,
3777 struct dwarf2_per_cu_data *per_cu,
3778 const char *name, const char *real_path,
3779 gdb::function_view<bool (symtab *)> callback)
3781 struct compunit_symtab *last_made = objfile->compunit_symtabs;
3783 /* Don't visit already-expanded CUs. */
3784 if (per_cu->v.quick->compunit_symtab)
3787 /* This may expand more than one symtab, and we want to iterate over
3789 dw2_instantiate_symtab (per_cu, false);
3791 return iterate_over_some_symtabs (name, real_path, objfile->compunit_symtabs,
3792 last_made, callback);
3795 /* Implementation of the map_symtabs_matching_filename method. */
3798 dw2_map_symtabs_matching_filename
3799 (struct objfile *objfile, const char *name, const char *real_path,
3800 gdb::function_view<bool (symtab *)> callback)
3802 const char *name_basename = lbasename (name);
3803 struct dwarf2_per_objfile *dwarf2_per_objfile
3804 = get_dwarf2_per_objfile (objfile);
3806 /* The rule is CUs specify all the files, including those used by
3807 any TU, so there's no need to scan TUs here. */
3809 for (dwarf2_per_cu_data *per_cu : dwarf2_per_objfile->all_comp_units)
3811 /* We only need to look at symtabs not already expanded. */
3812 if (per_cu->v.quick->compunit_symtab)
3815 quick_file_names *file_data = dw2_get_file_names (per_cu);
3816 if (file_data == NULL)
3819 for (int j = 0; j < file_data->num_file_names; ++j)
3821 const char *this_name = file_data->file_names[j];
3822 const char *this_real_name;
3824 if (compare_filenames_for_search (this_name, name))
3826 if (dw2_map_expand_apply (objfile, per_cu, name, real_path,
3832 /* Before we invoke realpath, which can get expensive when many
3833 files are involved, do a quick comparison of the basenames. */
3834 if (! basenames_may_differ
3835 && FILENAME_CMP (lbasename (this_name), name_basename) != 0)
3838 this_real_name = dw2_get_real_path (objfile, file_data, j);
3839 if (compare_filenames_for_search (this_real_name, name))
3841 if (dw2_map_expand_apply (objfile, per_cu, name, real_path,
3847 if (real_path != NULL)
3849 gdb_assert (IS_ABSOLUTE_PATH (real_path));
3850 gdb_assert (IS_ABSOLUTE_PATH (name));
3851 if (this_real_name != NULL
3852 && FILENAME_CMP (real_path, this_real_name) == 0)
3854 if (dw2_map_expand_apply (objfile, per_cu, name, real_path,
3866 /* Struct used to manage iterating over all CUs looking for a symbol. */
3868 struct dw2_symtab_iterator
3870 /* The dwarf2_per_objfile owning the CUs we are iterating on. */
3871 struct dwarf2_per_objfile *dwarf2_per_objfile;
3872 /* If non-zero, only look for symbols that match BLOCK_INDEX. */
3873 int want_specific_block;
3874 /* One of GLOBAL_BLOCK or STATIC_BLOCK.
3875 Unused if !WANT_SPECIFIC_BLOCK. */
3877 /* The kind of symbol we're looking for. */
3879 /* The list of CUs from the index entry of the symbol,
3880 or NULL if not found. */
3882 /* The next element in VEC to look at. */
3884 /* The number of elements in VEC, or zero if there is no match. */
3886 /* Have we seen a global version of the symbol?
3887 If so we can ignore all further global instances.
3888 This is to work around gold/15646, inefficient gold-generated
3893 /* Initialize the index symtab iterator ITER.
3894 If WANT_SPECIFIC_BLOCK is non-zero, only look for symbols
3895 in block BLOCK_INDEX. Otherwise BLOCK_INDEX is ignored. */
3898 dw2_symtab_iter_init (struct dw2_symtab_iterator *iter,
3899 struct dwarf2_per_objfile *dwarf2_per_objfile,
3900 int want_specific_block,
3905 iter->dwarf2_per_objfile = dwarf2_per_objfile;
3906 iter->want_specific_block = want_specific_block;
3907 iter->block_index = block_index;
3908 iter->domain = domain;
3910 iter->global_seen = 0;
3912 mapped_index *index = dwarf2_per_objfile->index_table.get ();
3914 /* index is NULL if OBJF_READNOW. */
3915 if (index != NULL && find_slot_in_mapped_hash (index, name, &iter->vec))
3916 iter->length = MAYBE_SWAP (*iter->vec);
3924 /* Return the next matching CU or NULL if there are no more. */
3926 static struct dwarf2_per_cu_data *
3927 dw2_symtab_iter_next (struct dw2_symtab_iterator *iter)
3929 struct dwarf2_per_objfile *dwarf2_per_objfile = iter->dwarf2_per_objfile;
3931 for ( ; iter->next < iter->length; ++iter->next)
3933 offset_type cu_index_and_attrs =
3934 MAYBE_SWAP (iter->vec[iter->next + 1]);
3935 offset_type cu_index = GDB_INDEX_CU_VALUE (cu_index_and_attrs);
3936 int want_static = iter->block_index != GLOBAL_BLOCK;
3937 /* This value is only valid for index versions >= 7. */
3938 int is_static = GDB_INDEX_SYMBOL_STATIC_VALUE (cu_index_and_attrs);
3939 gdb_index_symbol_kind symbol_kind =
3940 GDB_INDEX_SYMBOL_KIND_VALUE (cu_index_and_attrs);
3941 /* Only check the symbol attributes if they're present.
3942 Indices prior to version 7 don't record them,
3943 and indices >= 7 may elide them for certain symbols
3944 (gold does this). */
3946 (dwarf2_per_objfile->index_table->version >= 7
3947 && symbol_kind != GDB_INDEX_SYMBOL_KIND_NONE);
3949 /* Don't crash on bad data. */
3950 if (cu_index >= (dwarf2_per_objfile->all_comp_units.size ()
3951 + dwarf2_per_objfile->all_type_units.size ()))
3953 complaint (_(".gdb_index entry has bad CU index"
3955 objfile_name (dwarf2_per_objfile->objfile));
3959 dwarf2_per_cu_data *per_cu = dwarf2_per_objfile->get_cutu (cu_index);
3961 /* Skip if already read in. */
3962 if (per_cu->v.quick->compunit_symtab)
3965 /* Check static vs global. */
3968 if (iter->want_specific_block
3969 && want_static != is_static)
3971 /* Work around gold/15646. */
3972 if (!is_static && iter->global_seen)
3975 iter->global_seen = 1;
3978 /* Only check the symbol's kind if it has one. */
3981 switch (iter->domain)
3984 if (symbol_kind != GDB_INDEX_SYMBOL_KIND_VARIABLE
3985 && symbol_kind != GDB_INDEX_SYMBOL_KIND_FUNCTION
3986 /* Some types are also in VAR_DOMAIN. */
3987 && symbol_kind != GDB_INDEX_SYMBOL_KIND_TYPE)
3991 if (symbol_kind != GDB_INDEX_SYMBOL_KIND_TYPE)
3995 if (symbol_kind != GDB_INDEX_SYMBOL_KIND_OTHER)
4010 static struct compunit_symtab *
4011 dw2_lookup_symbol (struct objfile *objfile, int block_index,
4012 const char *name, domain_enum domain)
4014 struct compunit_symtab *stab_best = NULL;
4015 struct dwarf2_per_objfile *dwarf2_per_objfile
4016 = get_dwarf2_per_objfile (objfile);
4018 lookup_name_info lookup_name (name, symbol_name_match_type::FULL);
4020 struct dw2_symtab_iterator iter;
4021 struct dwarf2_per_cu_data *per_cu;
4023 dw2_symtab_iter_init (&iter, dwarf2_per_objfile, 1, block_index, domain, name);
4025 while ((per_cu = dw2_symtab_iter_next (&iter)) != NULL)
4027 struct symbol *sym, *with_opaque = NULL;
4028 struct compunit_symtab *stab = dw2_instantiate_symtab (per_cu, false);
4029 const struct blockvector *bv = COMPUNIT_BLOCKVECTOR (stab);
4030 struct block *block = BLOCKVECTOR_BLOCK (bv, block_index);
4032 sym = block_find_symbol (block, name, domain,
4033 block_find_non_opaque_type_preferred,
4036 /* Some caution must be observed with overloaded functions
4037 and methods, since the index will not contain any overload
4038 information (but NAME might contain it). */
4041 && SYMBOL_MATCHES_SEARCH_NAME (sym, lookup_name))
4043 if (with_opaque != NULL
4044 && SYMBOL_MATCHES_SEARCH_NAME (with_opaque, lookup_name))
4047 /* Keep looking through other CUs. */
4054 dw2_print_stats (struct objfile *objfile)
4056 struct dwarf2_per_objfile *dwarf2_per_objfile
4057 = get_dwarf2_per_objfile (objfile);
4058 int total = (dwarf2_per_objfile->all_comp_units.size ()
4059 + dwarf2_per_objfile->all_type_units.size ());
4062 for (int i = 0; i < total; ++i)
4064 dwarf2_per_cu_data *per_cu = dwarf2_per_objfile->get_cutu (i);
4066 if (!per_cu->v.quick->compunit_symtab)
4069 printf_filtered (_(" Number of read CUs: %d\n"), total - count);
4070 printf_filtered (_(" Number of unread CUs: %d\n"), count);
4073 /* This dumps minimal information about the index.
4074 It is called via "mt print objfiles".
4075 One use is to verify .gdb_index has been loaded by the
4076 gdb.dwarf2/gdb-index.exp testcase. */
4079 dw2_dump (struct objfile *objfile)
4081 struct dwarf2_per_objfile *dwarf2_per_objfile
4082 = get_dwarf2_per_objfile (objfile);
4084 gdb_assert (dwarf2_per_objfile->using_index);
4085 printf_filtered (".gdb_index:");
4086 if (dwarf2_per_objfile->index_table != NULL)
4088 printf_filtered (" version %d\n",
4089 dwarf2_per_objfile->index_table->version);
4092 printf_filtered (" faked for \"readnow\"\n");
4093 printf_filtered ("\n");
4097 dw2_relocate (struct objfile *objfile,
4098 const struct section_offsets *new_offsets,
4099 const struct section_offsets *delta)
4101 /* There's nothing to relocate here. */
4105 dw2_expand_symtabs_for_function (struct objfile *objfile,
4106 const char *func_name)
4108 struct dwarf2_per_objfile *dwarf2_per_objfile
4109 = get_dwarf2_per_objfile (objfile);
4111 struct dw2_symtab_iterator iter;
4112 struct dwarf2_per_cu_data *per_cu;
4114 /* Note: It doesn't matter what we pass for block_index here. */
4115 dw2_symtab_iter_init (&iter, dwarf2_per_objfile, 0, GLOBAL_BLOCK, VAR_DOMAIN,
4118 while ((per_cu = dw2_symtab_iter_next (&iter)) != NULL)
4119 dw2_instantiate_symtab (per_cu, false);
4124 dw2_expand_all_symtabs (struct objfile *objfile)
4126 struct dwarf2_per_objfile *dwarf2_per_objfile
4127 = get_dwarf2_per_objfile (objfile);
4128 int total_units = (dwarf2_per_objfile->all_comp_units.size ()
4129 + dwarf2_per_objfile->all_type_units.size ());
4131 for (int i = 0; i < total_units; ++i)
4133 dwarf2_per_cu_data *per_cu = dwarf2_per_objfile->get_cutu (i);
4135 /* We don't want to directly expand a partial CU, because if we
4136 read it with the wrong language, then assertion failures can
4137 be triggered later on. See PR symtab/23010. So, tell
4138 dw2_instantiate_symtab to skip partial CUs -- any important
4139 partial CU will be read via DW_TAG_imported_unit anyway. */
4140 dw2_instantiate_symtab (per_cu, true);
4145 dw2_expand_symtabs_with_fullname (struct objfile *objfile,
4146 const char *fullname)
4148 struct dwarf2_per_objfile *dwarf2_per_objfile
4149 = get_dwarf2_per_objfile (objfile);
4151 /* We don't need to consider type units here.
4152 This is only called for examining code, e.g. expand_line_sal.
4153 There can be an order of magnitude (or more) more type units
4154 than comp units, and we avoid them if we can. */
4156 for (dwarf2_per_cu_data *per_cu : dwarf2_per_objfile->all_comp_units)
4158 /* We only need to look at symtabs not already expanded. */
4159 if (per_cu->v.quick->compunit_symtab)
4162 quick_file_names *file_data = dw2_get_file_names (per_cu);
4163 if (file_data == NULL)
4166 for (int j = 0; j < file_data->num_file_names; ++j)
4168 const char *this_fullname = file_data->file_names[j];
4170 if (filename_cmp (this_fullname, fullname) == 0)
4172 dw2_instantiate_symtab (per_cu, false);
4180 dw2_map_matching_symbols (struct objfile *objfile,
4181 const char * name, domain_enum domain,
4183 int (*callback) (struct block *,
4184 struct symbol *, void *),
4185 void *data, symbol_name_match_type match,
4186 symbol_compare_ftype *ordered_compare)
4188 /* Currently unimplemented; used for Ada. The function can be called if the
4189 current language is Ada for a non-Ada objfile using GNU index. As Ada
4190 does not look for non-Ada symbols this function should just return. */
4193 /* Symbol name matcher for .gdb_index names.
4195 Symbol names in .gdb_index have a few particularities:
4197 - There's no indication of which is the language of each symbol.
4199 Since each language has its own symbol name matching algorithm,
4200 and we don't know which language is the right one, we must match
4201 each symbol against all languages. This would be a potential
4202 performance problem if it were not mitigated by the
4203 mapped_index::name_components lookup table, which significantly
4204 reduces the number of times we need to call into this matcher,
4205 making it a non-issue.
4207 - Symbol names in the index have no overload (parameter)
4208 information. I.e., in C++, "foo(int)" and "foo(long)" both
4209 appear as "foo" in the index, for example.
4211 This means that the lookup names passed to the symbol name
4212 matcher functions must have no parameter information either
4213 because (e.g.) symbol search name "foo" does not match
4214 lookup-name "foo(int)" [while swapping search name for lookup
4217 class gdb_index_symbol_name_matcher
4220 /* Prepares the vector of comparison functions for LOOKUP_NAME. */
4221 gdb_index_symbol_name_matcher (const lookup_name_info &lookup_name);
4223 /* Walk all the matcher routines and match SYMBOL_NAME against them.
4224 Returns true if any matcher matches. */
4225 bool matches (const char *symbol_name);
4228 /* A reference to the lookup name we're matching against. */
4229 const lookup_name_info &m_lookup_name;
4231 /* A vector holding all the different symbol name matchers, for all
4233 std::vector<symbol_name_matcher_ftype *> m_symbol_name_matcher_funcs;
4236 gdb_index_symbol_name_matcher::gdb_index_symbol_name_matcher
4237 (const lookup_name_info &lookup_name)
4238 : m_lookup_name (lookup_name)
4240 /* Prepare the vector of comparison functions upfront, to avoid
4241 doing the same work for each symbol. Care is taken to avoid
4242 matching with the same matcher more than once if/when multiple
4243 languages use the same matcher function. */
4244 auto &matchers = m_symbol_name_matcher_funcs;
4245 matchers.reserve (nr_languages);
4247 matchers.push_back (default_symbol_name_matcher);
4249 for (int i = 0; i < nr_languages; i++)
4251 const language_defn *lang = language_def ((enum language) i);
4252 symbol_name_matcher_ftype *name_matcher
4253 = get_symbol_name_matcher (lang, m_lookup_name);
4255 /* Don't insert the same comparison routine more than once.
4256 Note that we do this linear walk instead of a seemingly
4257 cheaper sorted insert, or use a std::set or something like
4258 that, because relative order of function addresses is not
4259 stable. This is not a problem in practice because the number
4260 of supported languages is low, and the cost here is tiny
4261 compared to the number of searches we'll do afterwards using
4263 if (name_matcher != default_symbol_name_matcher
4264 && (std::find (matchers.begin (), matchers.end (), name_matcher)
4265 == matchers.end ()))
4266 matchers.push_back (name_matcher);
4271 gdb_index_symbol_name_matcher::matches (const char *symbol_name)
4273 for (auto matches_name : m_symbol_name_matcher_funcs)
4274 if (matches_name (symbol_name, m_lookup_name, NULL))
4280 /* Starting from a search name, return the string that finds the upper
4281 bound of all strings that start with SEARCH_NAME in a sorted name
4282 list. Returns the empty string to indicate that the upper bound is
4283 the end of the list. */
4286 make_sort_after_prefix_name (const char *search_name)
4288 /* When looking to complete "func", we find the upper bound of all
4289 symbols that start with "func" by looking for where we'd insert
4290 the closest string that would follow "func" in lexicographical
4291 order. Usually, that's "func"-with-last-character-incremented,
4292 i.e. "fund". Mind non-ASCII characters, though. Usually those
4293 will be UTF-8 multi-byte sequences, but we can't be certain.
4294 Especially mind the 0xff character, which is a valid character in
4295 non-UTF-8 source character sets (e.g. Latin1 'ÿ'), and we can't
4296 rule out compilers allowing it in identifiers. Note that
4297 conveniently, strcmp/strcasecmp are specified to compare
4298 characters interpreted as unsigned char. So what we do is treat
4299 the whole string as a base 256 number composed of a sequence of
4300 base 256 "digits" and add 1 to it. I.e., adding 1 to 0xff wraps
4301 to 0, and carries 1 to the following more-significant position.
4302 If the very first character in SEARCH_NAME ends up incremented
4303 and carries/overflows, then the upper bound is the end of the
4304 list. The string after the empty string is also the empty
4307 Some examples of this operation:
4309 SEARCH_NAME => "+1" RESULT
4313 "\xff" "a" "\xff" => "\xff" "b"
4318 Then, with these symbols for example:
4324 completing "func" looks for symbols between "func" and
4325 "func"-with-last-character-incremented, i.e. "fund" (exclusive),
4326 which finds "func" and "func1", but not "fund".
4330 funcÿ (Latin1 'ÿ' [0xff])
4334 completing "funcÿ" looks for symbols between "funcÿ" and "fund"
4335 (exclusive), which finds "funcÿ" and "funcÿ1", but not "fund".
4339 ÿÿ (Latin1 'ÿ' [0xff])
4342 completing "ÿ" or "ÿÿ" looks for symbols between between "ÿÿ" and
4343 the end of the list.
4345 std::string after = search_name;
4346 while (!after.empty () && (unsigned char) after.back () == 0xff)
4348 if (!after.empty ())
4349 after.back () = (unsigned char) after.back () + 1;
4353 /* See declaration. */
4355 std::pair<std::vector<name_component>::const_iterator,
4356 std::vector<name_component>::const_iterator>
4357 mapped_index_base::find_name_components_bounds
4358 (const lookup_name_info &lookup_name_without_params) const
4361 = this->name_components_casing == case_sensitive_on ? strcmp : strcasecmp;
4364 = lookup_name_without_params.cplus ().lookup_name ().c_str ();
4366 /* Comparison function object for lower_bound that matches against a
4367 given symbol name. */
4368 auto lookup_compare_lower = [&] (const name_component &elem,
4371 const char *elem_qualified = this->symbol_name_at (elem.idx);
4372 const char *elem_name = elem_qualified + elem.name_offset;
4373 return name_cmp (elem_name, name) < 0;
4376 /* Comparison function object for upper_bound that matches against a
4377 given symbol name. */
4378 auto lookup_compare_upper = [&] (const char *name,
4379 const name_component &elem)
4381 const char *elem_qualified = this->symbol_name_at (elem.idx);
4382 const char *elem_name = elem_qualified + elem.name_offset;
4383 return name_cmp (name, elem_name) < 0;
4386 auto begin = this->name_components.begin ();
4387 auto end = this->name_components.end ();
4389 /* Find the lower bound. */
4392 if (lookup_name_without_params.completion_mode () && cplus[0] == '\0')
4395 return std::lower_bound (begin, end, cplus, lookup_compare_lower);
4398 /* Find the upper bound. */
4401 if (lookup_name_without_params.completion_mode ())
4403 /* In completion mode, we want UPPER to point past all
4404 symbols names that have the same prefix. I.e., with
4405 these symbols, and completing "func":
4407 function << lower bound
4409 other_function << upper bound
4411 We find the upper bound by looking for the insertion
4412 point of "func"-with-last-character-incremented,
4414 std::string after = make_sort_after_prefix_name (cplus);
4417 return std::lower_bound (lower, end, after.c_str (),
4418 lookup_compare_lower);
4421 return std::upper_bound (lower, end, cplus, lookup_compare_upper);
4424 return {lower, upper};
4427 /* See declaration. */
4430 mapped_index_base::build_name_components ()
4432 if (!this->name_components.empty ())
4435 this->name_components_casing = case_sensitivity;
4437 = this->name_components_casing == case_sensitive_on ? strcmp : strcasecmp;
4439 /* The code below only knows how to break apart components of C++
4440 symbol names (and other languages that use '::' as
4441 namespace/module separator). If we add support for wild matching
4442 to some language that uses some other operator (E.g., Ada, Go and
4443 D use '.'), then we'll need to try splitting the symbol name
4444 according to that language too. Note that Ada does support wild
4445 matching, but doesn't currently support .gdb_index. */
4446 auto count = this->symbol_name_count ();
4447 for (offset_type idx = 0; idx < count; idx++)
4449 if (this->symbol_name_slot_invalid (idx))
4452 const char *name = this->symbol_name_at (idx);
4454 /* Add each name component to the name component table. */
4455 unsigned int previous_len = 0;
4456 for (unsigned int current_len = cp_find_first_component (name);
4457 name[current_len] != '\0';
4458 current_len += cp_find_first_component (name + current_len))
4460 gdb_assert (name[current_len] == ':');
4461 this->name_components.push_back ({previous_len, idx});
4462 /* Skip the '::'. */
4464 previous_len = current_len;
4466 this->name_components.push_back ({previous_len, idx});
4469 /* Sort name_components elements by name. */
4470 auto name_comp_compare = [&] (const name_component &left,
4471 const name_component &right)
4473 const char *left_qualified = this->symbol_name_at (left.idx);
4474 const char *right_qualified = this->symbol_name_at (right.idx);
4476 const char *left_name = left_qualified + left.name_offset;
4477 const char *right_name = right_qualified + right.name_offset;
4479 return name_cmp (left_name, right_name) < 0;
4482 std::sort (this->name_components.begin (),
4483 this->name_components.end (),
4487 /* Helper for dw2_expand_symtabs_matching that works with a
4488 mapped_index_base instead of the containing objfile. This is split
4489 to a separate function in order to be able to unit test the
4490 name_components matching using a mock mapped_index_base. For each
4491 symbol name that matches, calls MATCH_CALLBACK, passing it the
4492 symbol's index in the mapped_index_base symbol table. */
4495 dw2_expand_symtabs_matching_symbol
4496 (mapped_index_base &index,
4497 const lookup_name_info &lookup_name_in,
4498 gdb::function_view<expand_symtabs_symbol_matcher_ftype> symbol_matcher,
4499 enum search_domain kind,
4500 gdb::function_view<void (offset_type)> match_callback)
4502 lookup_name_info lookup_name_without_params
4503 = lookup_name_in.make_ignore_params ();
4504 gdb_index_symbol_name_matcher lookup_name_matcher
4505 (lookup_name_without_params);
4507 /* Build the symbol name component sorted vector, if we haven't
4509 index.build_name_components ();
4511 auto bounds = index.find_name_components_bounds (lookup_name_without_params);
4513 /* Now for each symbol name in range, check to see if we have a name
4514 match, and if so, call the MATCH_CALLBACK callback. */
4516 /* The same symbol may appear more than once in the range though.
4517 E.g., if we're looking for symbols that complete "w", and we have
4518 a symbol named "w1::w2", we'll find the two name components for
4519 that same symbol in the range. To be sure we only call the
4520 callback once per symbol, we first collect the symbol name
4521 indexes that matched in a temporary vector and ignore
4523 std::vector<offset_type> matches;
4524 matches.reserve (std::distance (bounds.first, bounds.second));
4526 for (; bounds.first != bounds.second; ++bounds.first)
4528 const char *qualified = index.symbol_name_at (bounds.first->idx);
4530 if (!lookup_name_matcher.matches (qualified)
4531 || (symbol_matcher != NULL && !symbol_matcher (qualified)))
4534 matches.push_back (bounds.first->idx);
4537 std::sort (matches.begin (), matches.end ());
4539 /* Finally call the callback, once per match. */
4541 for (offset_type idx : matches)
4545 match_callback (idx);
4550 /* Above we use a type wider than idx's for 'prev', since 0 and
4551 (offset_type)-1 are both possible values. */
4552 static_assert (sizeof (prev) > sizeof (offset_type), "");
4557 namespace selftests { namespace dw2_expand_symtabs_matching {
4559 /* A mock .gdb_index/.debug_names-like name index table, enough to
4560 exercise dw2_expand_symtabs_matching_symbol, which works with the
4561 mapped_index_base interface. Builds an index from the symbol list
4562 passed as parameter to the constructor. */
4563 class mock_mapped_index : public mapped_index_base
4566 mock_mapped_index (gdb::array_view<const char *> symbols)
4567 : m_symbol_table (symbols)
4570 DISABLE_COPY_AND_ASSIGN (mock_mapped_index);
4572 /* Return the number of names in the symbol table. */
4573 size_t symbol_name_count () const override
4575 return m_symbol_table.size ();
4578 /* Get the name of the symbol at IDX in the symbol table. */
4579 const char *symbol_name_at (offset_type idx) const override
4581 return m_symbol_table[idx];
4585 gdb::array_view<const char *> m_symbol_table;
4588 /* Convenience function that converts a NULL pointer to a "<null>"
4589 string, to pass to print routines. */
4592 string_or_null (const char *str)
4594 return str != NULL ? str : "<null>";
4597 /* Check if a lookup_name_info built from
4598 NAME/MATCH_TYPE/COMPLETION_MODE matches the symbols in the mock
4599 index. EXPECTED_LIST is the list of expected matches, in expected
4600 matching order. If no match expected, then an empty list is
4601 specified. Returns true on success. On failure prints a warning
4602 indicating the file:line that failed, and returns false. */
4605 check_match (const char *file, int line,
4606 mock_mapped_index &mock_index,
4607 const char *name, symbol_name_match_type match_type,
4608 bool completion_mode,
4609 std::initializer_list<const char *> expected_list)
4611 lookup_name_info lookup_name (name, match_type, completion_mode);
4613 bool matched = true;
4615 auto mismatch = [&] (const char *expected_str,
4618 warning (_("%s:%d: match_type=%s, looking-for=\"%s\", "
4619 "expected=\"%s\", got=\"%s\"\n"),
4621 (match_type == symbol_name_match_type::FULL
4623 name, string_or_null (expected_str), string_or_null (got));
4627 auto expected_it = expected_list.begin ();
4628 auto expected_end = expected_list.end ();
4630 dw2_expand_symtabs_matching_symbol (mock_index, lookup_name,
4632 [&] (offset_type idx)
4634 const char *matched_name = mock_index.symbol_name_at (idx);
4635 const char *expected_str
4636 = expected_it == expected_end ? NULL : *expected_it++;
4638 if (expected_str == NULL || strcmp (expected_str, matched_name) != 0)
4639 mismatch (expected_str, matched_name);
4642 const char *expected_str
4643 = expected_it == expected_end ? NULL : *expected_it++;
4644 if (expected_str != NULL)
4645 mismatch (expected_str, NULL);
4650 /* The symbols added to the mock mapped_index for testing (in
4652 static const char *test_symbols[] = {
4661 "ns2::tmpl<int>::foo2",
4662 "(anonymous namespace)::A::B::C",
4664 /* These are used to check that the increment-last-char in the
4665 matching algorithm for completion doesn't match "t1_fund" when
4666 completing "t1_func". */
4672 /* A UTF-8 name with multi-byte sequences to make sure that
4673 cp-name-parser understands this as a single identifier ("função"
4674 is "function" in PT). */
4677 /* \377 (0xff) is Latin1 'ÿ'. */
4680 /* \377 (0xff) is Latin1 'ÿ'. */
4684 /* A name with all sorts of complications. Starts with "z" to make
4685 it easier for the completion tests below. */
4686 #define Z_SYM_NAME \
4687 "z::std::tuple<(anonymous namespace)::ui*, std::bar<(anonymous namespace)::ui> >" \
4688 "::tuple<(anonymous namespace)::ui*, " \
4689 "std::default_delete<(anonymous namespace)::ui>, void>"
4694 /* Returns true if the mapped_index_base::find_name_component_bounds
4695 method finds EXPECTED_SYMS in INDEX when looking for SEARCH_NAME,
4696 in completion mode. */
4699 check_find_bounds_finds (mapped_index_base &index,
4700 const char *search_name,
4701 gdb::array_view<const char *> expected_syms)
4703 lookup_name_info lookup_name (search_name,
4704 symbol_name_match_type::FULL, true);
4706 auto bounds = index.find_name_components_bounds (lookup_name);
4708 size_t distance = std::distance (bounds.first, bounds.second);
4709 if (distance != expected_syms.size ())
4712 for (size_t exp_elem = 0; exp_elem < distance; exp_elem++)
4714 auto nc_elem = bounds.first + exp_elem;
4715 const char *qualified = index.symbol_name_at (nc_elem->idx);
4716 if (strcmp (qualified, expected_syms[exp_elem]) != 0)
4723 /* Test the lower-level mapped_index::find_name_component_bounds
4727 test_mapped_index_find_name_component_bounds ()
4729 mock_mapped_index mock_index (test_symbols);
4731 mock_index.build_name_components ();
4733 /* Test the lower-level mapped_index::find_name_component_bounds
4734 method in completion mode. */
4736 static const char *expected_syms[] = {
4741 SELF_CHECK (check_find_bounds_finds (mock_index,
4742 "t1_func", expected_syms));
4745 /* Check that the increment-last-char in the name matching algorithm
4746 for completion doesn't get confused with Ansi1 'ÿ' / 0xff. */
4748 static const char *expected_syms1[] = {
4752 SELF_CHECK (check_find_bounds_finds (mock_index,
4753 "\377", expected_syms1));
4755 static const char *expected_syms2[] = {
4758 SELF_CHECK (check_find_bounds_finds (mock_index,
4759 "\377\377", expected_syms2));
4763 /* Test dw2_expand_symtabs_matching_symbol. */
4766 test_dw2_expand_symtabs_matching_symbol ()
4768 mock_mapped_index mock_index (test_symbols);
4770 /* We let all tests run until the end even if some fails, for debug
4772 bool any_mismatch = false;
4774 /* Create the expected symbols list (an initializer_list). Needed
4775 because lists have commas, and we need to pass them to CHECK,
4776 which is a macro. */
4777 #define EXPECT(...) { __VA_ARGS__ }
4779 /* Wrapper for check_match that passes down the current
4780 __FILE__/__LINE__. */
4781 #define CHECK_MATCH(NAME, MATCH_TYPE, COMPLETION_MODE, EXPECTED_LIST) \
4782 any_mismatch |= !check_match (__FILE__, __LINE__, \
4784 NAME, MATCH_TYPE, COMPLETION_MODE, \
4787 /* Identity checks. */
4788 for (const char *sym : test_symbols)
4790 /* Should be able to match all existing symbols. */
4791 CHECK_MATCH (sym, symbol_name_match_type::FULL, false,
4794 /* Should be able to match all existing symbols with
4796 std::string with_params = std::string (sym) + "(int)";
4797 CHECK_MATCH (with_params.c_str (), symbol_name_match_type::FULL, false,
4800 /* Should be able to match all existing symbols with
4801 parameters and qualifiers. */
4802 with_params = std::string (sym) + " ( int ) const";
4803 CHECK_MATCH (with_params.c_str (), symbol_name_match_type::FULL, false,
4806 /* This should really find sym, but cp-name-parser.y doesn't
4807 know about lvalue/rvalue qualifiers yet. */
4808 with_params = std::string (sym) + " ( int ) &&";
4809 CHECK_MATCH (with_params.c_str (), symbol_name_match_type::FULL, false,
4813 /* Check that the name matching algorithm for completion doesn't get
4814 confused with Latin1 'ÿ' / 0xff. */
4816 static const char str[] = "\377";
4817 CHECK_MATCH (str, symbol_name_match_type::FULL, true,
4818 EXPECT ("\377", "\377\377123"));
4821 /* Check that the increment-last-char in the matching algorithm for
4822 completion doesn't match "t1_fund" when completing "t1_func". */
4824 static const char str[] = "t1_func";
4825 CHECK_MATCH (str, symbol_name_match_type::FULL, true,
4826 EXPECT ("t1_func", "t1_func1"));
4829 /* Check that completion mode works at each prefix of the expected
4832 static const char str[] = "function(int)";
4833 size_t len = strlen (str);
4836 for (size_t i = 1; i < len; i++)
4838 lookup.assign (str, i);
4839 CHECK_MATCH (lookup.c_str (), symbol_name_match_type::FULL, true,
4840 EXPECT ("function"));
4844 /* While "w" is a prefix of both components, the match function
4845 should still only be called once. */
4847 CHECK_MATCH ("w", symbol_name_match_type::FULL, true,
4849 CHECK_MATCH ("w", symbol_name_match_type::WILD, true,
4853 /* Same, with a "complicated" symbol. */
4855 static const char str[] = Z_SYM_NAME;
4856 size_t len = strlen (str);
4859 for (size_t i = 1; i < len; i++)
4861 lookup.assign (str, i);
4862 CHECK_MATCH (lookup.c_str (), symbol_name_match_type::FULL, true,
4863 EXPECT (Z_SYM_NAME));
4867 /* In FULL mode, an incomplete symbol doesn't match. */
4869 CHECK_MATCH ("std::zfunction(int", symbol_name_match_type::FULL, false,
4873 /* A complete symbol with parameters matches any overload, since the
4874 index has no overload info. */
4876 CHECK_MATCH ("std::zfunction(int)", symbol_name_match_type::FULL, true,
4877 EXPECT ("std::zfunction", "std::zfunction2"));
4878 CHECK_MATCH ("zfunction(int)", symbol_name_match_type::WILD, true,
4879 EXPECT ("std::zfunction", "std::zfunction2"));
4880 CHECK_MATCH ("zfunc", symbol_name_match_type::WILD, true,
4881 EXPECT ("std::zfunction", "std::zfunction2"));
4884 /* Check that whitespace is ignored appropriately. A symbol with a
4885 template argument list. */
4887 static const char expected[] = "ns::foo<int>";
4888 CHECK_MATCH ("ns :: foo < int > ", symbol_name_match_type::FULL, false,
4890 CHECK_MATCH ("foo < int > ", symbol_name_match_type::WILD, false,
4894 /* Check that whitespace is ignored appropriately. A symbol with a
4895 template argument list that includes a pointer. */
4897 static const char expected[] = "ns::foo<char*>";
4898 /* Try both completion and non-completion modes. */
4899 static const bool completion_mode[2] = {false, true};
4900 for (size_t i = 0; i < 2; i++)
4902 CHECK_MATCH ("ns :: foo < char * >", symbol_name_match_type::FULL,
4903 completion_mode[i], EXPECT (expected));
4904 CHECK_MATCH ("foo < char * >", symbol_name_match_type::WILD,
4905 completion_mode[i], EXPECT (expected));
4907 CHECK_MATCH ("ns :: foo < char * > (int)", symbol_name_match_type::FULL,
4908 completion_mode[i], EXPECT (expected));
4909 CHECK_MATCH ("foo < char * > (int)", symbol_name_match_type::WILD,
4910 completion_mode[i], EXPECT (expected));
4915 /* Check method qualifiers are ignored. */
4916 static const char expected[] = "ns::foo<char*>";
4917 CHECK_MATCH ("ns :: foo < char * > ( int ) const",
4918 symbol_name_match_type::FULL, true, EXPECT (expected));
4919 CHECK_MATCH ("ns :: foo < char * > ( int ) &&",
4920 symbol_name_match_type::FULL, true, EXPECT (expected));
4921 CHECK_MATCH ("foo < char * > ( int ) const",
4922 symbol_name_match_type::WILD, true, EXPECT (expected));
4923 CHECK_MATCH ("foo < char * > ( int ) &&",
4924 symbol_name_match_type::WILD, true, EXPECT (expected));
4927 /* Test lookup names that don't match anything. */
4929 CHECK_MATCH ("bar2", symbol_name_match_type::WILD, false,
4932 CHECK_MATCH ("doesntexist", symbol_name_match_type::FULL, false,
4936 /* Some wild matching tests, exercising "(anonymous namespace)",
4937 which should not be confused with a parameter list. */
4939 static const char *syms[] = {
4943 "A :: B :: C ( int )",
4948 for (const char *s : syms)
4950 CHECK_MATCH (s, symbol_name_match_type::WILD, false,
4951 EXPECT ("(anonymous namespace)::A::B::C"));
4956 static const char expected[] = "ns2::tmpl<int>::foo2";
4957 CHECK_MATCH ("tmp", symbol_name_match_type::WILD, true,
4959 CHECK_MATCH ("tmpl<", symbol_name_match_type::WILD, true,
4963 SELF_CHECK (!any_mismatch);
4972 test_mapped_index_find_name_component_bounds ();
4973 test_dw2_expand_symtabs_matching_symbol ();
4976 }} // namespace selftests::dw2_expand_symtabs_matching
4978 #endif /* GDB_SELF_TEST */
4980 /* If FILE_MATCHER is NULL or if PER_CU has
4981 dwarf2_per_cu_quick_data::MARK set (see
4982 dw_expand_symtabs_matching_file_matcher), expand the CU and call
4983 EXPANSION_NOTIFY on it. */
4986 dw2_expand_symtabs_matching_one
4987 (struct dwarf2_per_cu_data *per_cu,
4988 gdb::function_view<expand_symtabs_file_matcher_ftype> file_matcher,
4989 gdb::function_view<expand_symtabs_exp_notify_ftype> expansion_notify)
4991 if (file_matcher == NULL || per_cu->v.quick->mark)
4993 bool symtab_was_null
4994 = (per_cu->v.quick->compunit_symtab == NULL);
4996 dw2_instantiate_symtab (per_cu, false);
4998 if (expansion_notify != NULL
5000 && per_cu->v.quick->compunit_symtab != NULL)
5001 expansion_notify (per_cu->v.quick->compunit_symtab);
5005 /* Helper for dw2_expand_matching symtabs. Called on each symbol
5006 matched, to expand corresponding CUs that were marked. IDX is the
5007 index of the symbol name that matched. */
5010 dw2_expand_marked_cus
5011 (struct dwarf2_per_objfile *dwarf2_per_objfile, offset_type idx,
5012 gdb::function_view<expand_symtabs_file_matcher_ftype> file_matcher,
5013 gdb::function_view<expand_symtabs_exp_notify_ftype> expansion_notify,
5016 offset_type *vec, vec_len, vec_idx;
5017 bool global_seen = false;
5018 mapped_index &index = *dwarf2_per_objfile->index_table;
5020 vec = (offset_type *) (index.constant_pool
5021 + MAYBE_SWAP (index.symbol_table[idx].vec));
5022 vec_len = MAYBE_SWAP (vec[0]);
5023 for (vec_idx = 0; vec_idx < vec_len; ++vec_idx)
5025 offset_type cu_index_and_attrs = MAYBE_SWAP (vec[vec_idx + 1]);
5026 /* This value is only valid for index versions >= 7. */
5027 int is_static = GDB_INDEX_SYMBOL_STATIC_VALUE (cu_index_and_attrs);
5028 gdb_index_symbol_kind symbol_kind =
5029 GDB_INDEX_SYMBOL_KIND_VALUE (cu_index_and_attrs);
5030 int cu_index = GDB_INDEX_CU_VALUE (cu_index_and_attrs);
5031 /* Only check the symbol attributes if they're present.
5032 Indices prior to version 7 don't record them,
5033 and indices >= 7 may elide them for certain symbols
5034 (gold does this). */
5037 && symbol_kind != GDB_INDEX_SYMBOL_KIND_NONE);
5039 /* Work around gold/15646. */
5042 if (!is_static && global_seen)
5048 /* Only check the symbol's kind if it has one. */
5053 case VARIABLES_DOMAIN:
5054 if (symbol_kind != GDB_INDEX_SYMBOL_KIND_VARIABLE)
5057 case FUNCTIONS_DOMAIN:
5058 if (symbol_kind != GDB_INDEX_SYMBOL_KIND_FUNCTION)
5062 if (symbol_kind != GDB_INDEX_SYMBOL_KIND_TYPE)
5070 /* Don't crash on bad data. */
5071 if (cu_index >= (dwarf2_per_objfile->all_comp_units.size ()
5072 + dwarf2_per_objfile->all_type_units.size ()))
5074 complaint (_(".gdb_index entry has bad CU index"
5076 objfile_name (dwarf2_per_objfile->objfile));
5080 dwarf2_per_cu_data *per_cu = dwarf2_per_objfile->get_cutu (cu_index);
5081 dw2_expand_symtabs_matching_one (per_cu, file_matcher,
5086 /* If FILE_MATCHER is non-NULL, set all the
5087 dwarf2_per_cu_quick_data::MARK of the current DWARF2_PER_OBJFILE
5088 that match FILE_MATCHER. */
5091 dw_expand_symtabs_matching_file_matcher
5092 (struct dwarf2_per_objfile *dwarf2_per_objfile,
5093 gdb::function_view<expand_symtabs_file_matcher_ftype> file_matcher)
5095 if (file_matcher == NULL)
5098 objfile *const objfile = dwarf2_per_objfile->objfile;
5100 htab_up visited_found (htab_create_alloc (10, htab_hash_pointer,
5102 NULL, xcalloc, xfree));
5103 htab_up visited_not_found (htab_create_alloc (10, htab_hash_pointer,
5105 NULL, xcalloc, xfree));
5107 /* The rule is CUs specify all the files, including those used by
5108 any TU, so there's no need to scan TUs here. */
5110 for (dwarf2_per_cu_data *per_cu : dwarf2_per_objfile->all_comp_units)
5114 per_cu->v.quick->mark = 0;
5116 /* We only need to look at symtabs not already expanded. */
5117 if (per_cu->v.quick->compunit_symtab)
5120 quick_file_names *file_data = dw2_get_file_names (per_cu);
5121 if (file_data == NULL)
5124 if (htab_find (visited_not_found.get (), file_data) != NULL)
5126 else if (htab_find (visited_found.get (), file_data) != NULL)
5128 per_cu->v.quick->mark = 1;
5132 for (int j = 0; j < file_data->num_file_names; ++j)
5134 const char *this_real_name;
5136 if (file_matcher (file_data->file_names[j], false))
5138 per_cu->v.quick->mark = 1;
5142 /* Before we invoke realpath, which can get expensive when many
5143 files are involved, do a quick comparison of the basenames. */
5144 if (!basenames_may_differ
5145 && !file_matcher (lbasename (file_data->file_names[j]),
5149 this_real_name = dw2_get_real_path (objfile, file_data, j);
5150 if (file_matcher (this_real_name, false))
5152 per_cu->v.quick->mark = 1;
5157 void **slot = htab_find_slot (per_cu->v.quick->mark
5158 ? visited_found.get ()
5159 : visited_not_found.get (),
5166 dw2_expand_symtabs_matching
5167 (struct objfile *objfile,
5168 gdb::function_view<expand_symtabs_file_matcher_ftype> file_matcher,
5169 const lookup_name_info &lookup_name,
5170 gdb::function_view<expand_symtabs_symbol_matcher_ftype> symbol_matcher,
5171 gdb::function_view<expand_symtabs_exp_notify_ftype> expansion_notify,
5172 enum search_domain kind)
5174 struct dwarf2_per_objfile *dwarf2_per_objfile
5175 = get_dwarf2_per_objfile (objfile);
5177 /* index_table is NULL if OBJF_READNOW. */
5178 if (!dwarf2_per_objfile->index_table)
5181 dw_expand_symtabs_matching_file_matcher (dwarf2_per_objfile, file_matcher);
5183 mapped_index &index = *dwarf2_per_objfile->index_table;
5185 dw2_expand_symtabs_matching_symbol (index, lookup_name,
5187 kind, [&] (offset_type idx)
5189 dw2_expand_marked_cus (dwarf2_per_objfile, idx, file_matcher,
5190 expansion_notify, kind);
5194 /* A helper for dw2_find_pc_sect_compunit_symtab which finds the most specific
5197 static struct compunit_symtab *
5198 recursively_find_pc_sect_compunit_symtab (struct compunit_symtab *cust,
5203 if (COMPUNIT_BLOCKVECTOR (cust) != NULL
5204 && blockvector_contains_pc (COMPUNIT_BLOCKVECTOR (cust), pc))
5207 if (cust->includes == NULL)
5210 for (i = 0; cust->includes[i]; ++i)
5212 struct compunit_symtab *s = cust->includes[i];
5214 s = recursively_find_pc_sect_compunit_symtab (s, pc);
5222 static struct compunit_symtab *
5223 dw2_find_pc_sect_compunit_symtab (struct objfile *objfile,
5224 struct bound_minimal_symbol msymbol,
5226 struct obj_section *section,
5229 struct dwarf2_per_cu_data *data;
5230 struct compunit_symtab *result;
5232 if (!objfile->psymtabs_addrmap)
5235 data = (struct dwarf2_per_cu_data *) addrmap_find (objfile->psymtabs_addrmap,
5240 if (warn_if_readin && data->v.quick->compunit_symtab)
5241 warning (_("(Internal error: pc %s in read in CU, but not in symtab.)"),
5242 paddress (get_objfile_arch (objfile), pc));
5245 = recursively_find_pc_sect_compunit_symtab (dw2_instantiate_symtab (data,
5248 gdb_assert (result != NULL);
5253 dw2_map_symbol_filenames (struct objfile *objfile, symbol_filename_ftype *fun,
5254 void *data, int need_fullname)
5256 struct dwarf2_per_objfile *dwarf2_per_objfile
5257 = get_dwarf2_per_objfile (objfile);
5259 if (!dwarf2_per_objfile->filenames_cache)
5261 dwarf2_per_objfile->filenames_cache.emplace ();
5263 htab_up visited (htab_create_alloc (10,
5264 htab_hash_pointer, htab_eq_pointer,
5265 NULL, xcalloc, xfree));
5267 /* The rule is CUs specify all the files, including those used
5268 by any TU, so there's no need to scan TUs here. We can
5269 ignore file names coming from already-expanded CUs. */
5271 for (dwarf2_per_cu_data *per_cu : dwarf2_per_objfile->all_comp_units)
5273 if (per_cu->v.quick->compunit_symtab)
5275 void **slot = htab_find_slot (visited.get (),
5276 per_cu->v.quick->file_names,
5279 *slot = per_cu->v.quick->file_names;
5283 for (dwarf2_per_cu_data *per_cu : dwarf2_per_objfile->all_comp_units)
5285 /* We only need to look at symtabs not already expanded. */
5286 if (per_cu->v.quick->compunit_symtab)
5289 quick_file_names *file_data = dw2_get_file_names (per_cu);
5290 if (file_data == NULL)
5293 void **slot = htab_find_slot (visited.get (), file_data, INSERT);
5296 /* Already visited. */
5301 for (int j = 0; j < file_data->num_file_names; ++j)
5303 const char *filename = file_data->file_names[j];
5304 dwarf2_per_objfile->filenames_cache->seen (filename);
5309 dwarf2_per_objfile->filenames_cache->traverse ([&] (const char *filename)
5311 gdb::unique_xmalloc_ptr<char> this_real_name;
5314 this_real_name = gdb_realpath (filename);
5315 (*fun) (filename, this_real_name.get (), data);
5320 dw2_has_symbols (struct objfile *objfile)
5325 const struct quick_symbol_functions dwarf2_gdb_index_functions =
5328 dw2_find_last_source_symtab,
5329 dw2_forget_cached_source_info,
5330 dw2_map_symtabs_matching_filename,
5335 dw2_expand_symtabs_for_function,
5336 dw2_expand_all_symtabs,
5337 dw2_expand_symtabs_with_fullname,
5338 dw2_map_matching_symbols,
5339 dw2_expand_symtabs_matching,
5340 dw2_find_pc_sect_compunit_symtab,
5342 dw2_map_symbol_filenames
5345 /* DWARF-5 debug_names reader. */
5347 /* DWARF-5 augmentation string for GDB's DW_IDX_GNU_* extension. */
5348 static const gdb_byte dwarf5_augmentation[] = { 'G', 'D', 'B', 0 };
5350 /* A helper function that reads the .debug_names section in SECTION
5351 and fills in MAP. FILENAME is the name of the file containing the
5352 section; it is used for error reporting.
5354 Returns true if all went well, false otherwise. */
5357 read_debug_names_from_section (struct objfile *objfile,
5358 const char *filename,
5359 struct dwarf2_section_info *section,
5360 mapped_debug_names &map)
5362 if (dwarf2_section_empty_p (section))
5365 /* Older elfutils strip versions could keep the section in the main
5366 executable while splitting it for the separate debug info file. */
5367 if ((get_section_flags (section) & SEC_HAS_CONTENTS) == 0)
5370 dwarf2_read_section (objfile, section);
5372 map.dwarf5_byte_order = gdbarch_byte_order (get_objfile_arch (objfile));
5374 const gdb_byte *addr = section->buffer;
5376 bfd *const abfd = get_section_bfd_owner (section);
5378 unsigned int bytes_read;
5379 LONGEST length = read_initial_length (abfd, addr, &bytes_read);
5382 map.dwarf5_is_dwarf64 = bytes_read != 4;
5383 map.offset_size = map.dwarf5_is_dwarf64 ? 8 : 4;
5384 if (bytes_read + length != section->size)
5386 /* There may be multiple per-CU indices. */
5387 warning (_("Section .debug_names in %s length %s does not match "
5388 "section length %s, ignoring .debug_names."),
5389 filename, plongest (bytes_read + length),
5390 pulongest (section->size));
5394 /* The version number. */
5395 uint16_t version = read_2_bytes (abfd, addr);
5399 warning (_("Section .debug_names in %s has unsupported version %d, "
5400 "ignoring .debug_names."),
5406 uint16_t padding = read_2_bytes (abfd, addr);
5410 warning (_("Section .debug_names in %s has unsupported padding %d, "
5411 "ignoring .debug_names."),
5416 /* comp_unit_count - The number of CUs in the CU list. */
5417 map.cu_count = read_4_bytes (abfd, addr);
5420 /* local_type_unit_count - The number of TUs in the local TU
5422 map.tu_count = read_4_bytes (abfd, addr);
5425 /* foreign_type_unit_count - The number of TUs in the foreign TU
5427 uint32_t foreign_tu_count = read_4_bytes (abfd, addr);
5429 if (foreign_tu_count != 0)
5431 warning (_("Section .debug_names in %s has unsupported %lu foreign TUs, "
5432 "ignoring .debug_names."),
5433 filename, static_cast<unsigned long> (foreign_tu_count));
5437 /* bucket_count - The number of hash buckets in the hash lookup
5439 map.bucket_count = read_4_bytes (abfd, addr);
5442 /* name_count - The number of unique names in the index. */
5443 map.name_count = read_4_bytes (abfd, addr);
5446 /* abbrev_table_size - The size in bytes of the abbreviations
5448 uint32_t abbrev_table_size = read_4_bytes (abfd, addr);
5451 /* augmentation_string_size - The size in bytes of the augmentation
5452 string. This value is rounded up to a multiple of 4. */
5453 uint32_t augmentation_string_size = read_4_bytes (abfd, addr);
5455 map.augmentation_is_gdb = ((augmentation_string_size
5456 == sizeof (dwarf5_augmentation))
5457 && memcmp (addr, dwarf5_augmentation,
5458 sizeof (dwarf5_augmentation)) == 0);
5459 augmentation_string_size += (-augmentation_string_size) & 3;
5460 addr += augmentation_string_size;
5463 map.cu_table_reordered = addr;
5464 addr += map.cu_count * map.offset_size;
5466 /* List of Local TUs */
5467 map.tu_table_reordered = addr;
5468 addr += map.tu_count * map.offset_size;
5470 /* Hash Lookup Table */
5471 map.bucket_table_reordered = reinterpret_cast<const uint32_t *> (addr);
5472 addr += map.bucket_count * 4;
5473 map.hash_table_reordered = reinterpret_cast<const uint32_t *> (addr);
5474 addr += map.name_count * 4;
5477 map.name_table_string_offs_reordered = addr;
5478 addr += map.name_count * map.offset_size;
5479 map.name_table_entry_offs_reordered = addr;
5480 addr += map.name_count * map.offset_size;
5482 const gdb_byte *abbrev_table_start = addr;
5485 unsigned int bytes_read;
5486 const ULONGEST index_num = read_unsigned_leb128 (abfd, addr, &bytes_read);
5491 const auto insertpair
5492 = map.abbrev_map.emplace (index_num, mapped_debug_names::index_val ());
5493 if (!insertpair.second)
5495 warning (_("Section .debug_names in %s has duplicate index %s, "
5496 "ignoring .debug_names."),
5497 filename, pulongest (index_num));
5500 mapped_debug_names::index_val &indexval = insertpair.first->second;
5501 indexval.dwarf_tag = read_unsigned_leb128 (abfd, addr, &bytes_read);
5506 mapped_debug_names::index_val::attr attr;
5507 attr.dw_idx = read_unsigned_leb128 (abfd, addr, &bytes_read);
5509 attr.form = read_unsigned_leb128 (abfd, addr, &bytes_read);
5511 if (attr.form == DW_FORM_implicit_const)
5513 attr.implicit_const = read_signed_leb128 (abfd, addr,
5517 if (attr.dw_idx == 0 && attr.form == 0)
5519 indexval.attr_vec.push_back (std::move (attr));
5522 if (addr != abbrev_table_start + abbrev_table_size)
5524 warning (_("Section .debug_names in %s has abbreviation_table "
5525 "of size %zu vs. written as %u, ignoring .debug_names."),
5526 filename, addr - abbrev_table_start, abbrev_table_size);
5529 map.entry_pool = addr;
5534 /* A helper for create_cus_from_debug_names that handles the MAP's CU
5538 create_cus_from_debug_names_list (struct dwarf2_per_objfile *dwarf2_per_objfile,
5539 const mapped_debug_names &map,
5540 dwarf2_section_info §ion,
5543 sect_offset sect_off_prev;
5544 for (uint32_t i = 0; i <= map.cu_count; ++i)
5546 sect_offset sect_off_next;
5547 if (i < map.cu_count)
5550 = (sect_offset) (extract_unsigned_integer
5551 (map.cu_table_reordered + i * map.offset_size,
5553 map.dwarf5_byte_order));
5556 sect_off_next = (sect_offset) section.size;
5559 const ULONGEST length = sect_off_next - sect_off_prev;
5560 dwarf2_per_cu_data *per_cu
5561 = create_cu_from_index_list (dwarf2_per_objfile, §ion, is_dwz,
5562 sect_off_prev, length);
5563 dwarf2_per_objfile->all_comp_units.push_back (per_cu);
5565 sect_off_prev = sect_off_next;
5569 /* Read the CU list from the mapped index, and use it to create all
5570 the CU objects for this dwarf2_per_objfile. */
5573 create_cus_from_debug_names (struct dwarf2_per_objfile *dwarf2_per_objfile,
5574 const mapped_debug_names &map,
5575 const mapped_debug_names &dwz_map)
5577 gdb_assert (dwarf2_per_objfile->all_comp_units.empty ());
5578 dwarf2_per_objfile->all_comp_units.reserve (map.cu_count + dwz_map.cu_count);
5580 create_cus_from_debug_names_list (dwarf2_per_objfile, map,
5581 dwarf2_per_objfile->info,
5582 false /* is_dwz */);
5584 if (dwz_map.cu_count == 0)
5587 dwz_file *dwz = dwarf2_get_dwz_file (dwarf2_per_objfile);
5588 create_cus_from_debug_names_list (dwarf2_per_objfile, dwz_map, dwz->info,
5592 /* Read .debug_names. If everything went ok, initialize the "quick"
5593 elements of all the CUs and return true. Otherwise, return false. */
5596 dwarf2_read_debug_names (struct dwarf2_per_objfile *dwarf2_per_objfile)
5598 std::unique_ptr<mapped_debug_names> map
5599 (new mapped_debug_names (dwarf2_per_objfile));
5600 mapped_debug_names dwz_map (dwarf2_per_objfile);
5601 struct objfile *objfile = dwarf2_per_objfile->objfile;
5603 if (!read_debug_names_from_section (objfile, objfile_name (objfile),
5604 &dwarf2_per_objfile->debug_names,
5608 /* Don't use the index if it's empty. */
5609 if (map->name_count == 0)
5612 /* If there is a .dwz file, read it so we can get its CU list as
5614 dwz_file *dwz = dwarf2_get_dwz_file (dwarf2_per_objfile);
5617 if (!read_debug_names_from_section (objfile,
5618 bfd_get_filename (dwz->dwz_bfd),
5619 &dwz->debug_names, dwz_map))
5621 warning (_("could not read '.debug_names' section from %s; skipping"),
5622 bfd_get_filename (dwz->dwz_bfd));
5627 create_cus_from_debug_names (dwarf2_per_objfile, *map, dwz_map);
5629 if (map->tu_count != 0)
5631 /* We can only handle a single .debug_types when we have an
5633 if (VEC_length (dwarf2_section_info_def, dwarf2_per_objfile->types) != 1)
5636 dwarf2_section_info *section = VEC_index (dwarf2_section_info_def,
5637 dwarf2_per_objfile->types, 0);
5639 create_signatured_type_table_from_debug_names
5640 (dwarf2_per_objfile, *map, section, &dwarf2_per_objfile->abbrev);
5643 create_addrmap_from_aranges (dwarf2_per_objfile,
5644 &dwarf2_per_objfile->debug_aranges);
5646 dwarf2_per_objfile->debug_names_table = std::move (map);
5647 dwarf2_per_objfile->using_index = 1;
5648 dwarf2_per_objfile->quick_file_names_table =
5649 create_quick_file_names_table (dwarf2_per_objfile->all_comp_units.size ());
5654 /* Type used to manage iterating over all CUs looking for a symbol for
5657 class dw2_debug_names_iterator
5660 /* If WANT_SPECIFIC_BLOCK is true, only look for symbols in block
5661 BLOCK_INDEX. Otherwise BLOCK_INDEX is ignored. */
5662 dw2_debug_names_iterator (const mapped_debug_names &map,
5663 bool want_specific_block,
5664 block_enum block_index, domain_enum domain,
5666 : m_map (map), m_want_specific_block (want_specific_block),
5667 m_block_index (block_index), m_domain (domain),
5668 m_addr (find_vec_in_debug_names (map, name))
5671 dw2_debug_names_iterator (const mapped_debug_names &map,
5672 search_domain search, uint32_t namei)
5675 m_addr (find_vec_in_debug_names (map, namei))
5678 /* Return the next matching CU or NULL if there are no more. */
5679 dwarf2_per_cu_data *next ();
5682 static const gdb_byte *find_vec_in_debug_names (const mapped_debug_names &map,
5684 static const gdb_byte *find_vec_in_debug_names (const mapped_debug_names &map,
5687 /* The internalized form of .debug_names. */
5688 const mapped_debug_names &m_map;
5690 /* If true, only look for symbols that match BLOCK_INDEX. */
5691 const bool m_want_specific_block = false;
5693 /* One of GLOBAL_BLOCK or STATIC_BLOCK.
5694 Unused if !WANT_SPECIFIC_BLOCK - FIRST_LOCAL_BLOCK is an invalid
5696 const block_enum m_block_index = FIRST_LOCAL_BLOCK;
5698 /* The kind of symbol we're looking for. */
5699 const domain_enum m_domain = UNDEF_DOMAIN;
5700 const search_domain m_search = ALL_DOMAIN;
5702 /* The list of CUs from the index entry of the symbol, or NULL if
5704 const gdb_byte *m_addr;
5708 mapped_debug_names::namei_to_name (uint32_t namei) const
5710 const ULONGEST namei_string_offs
5711 = extract_unsigned_integer ((name_table_string_offs_reordered
5712 + namei * offset_size),
5715 return read_indirect_string_at_offset
5716 (dwarf2_per_objfile, dwarf2_per_objfile->objfile->obfd, namei_string_offs);
5719 /* Find a slot in .debug_names for the object named NAME. If NAME is
5720 found, return pointer to its pool data. If NAME cannot be found,
5724 dw2_debug_names_iterator::find_vec_in_debug_names
5725 (const mapped_debug_names &map, const char *name)
5727 int (*cmp) (const char *, const char *);
5729 if (current_language->la_language == language_cplus
5730 || current_language->la_language == language_fortran
5731 || current_language->la_language == language_d)
5733 /* NAME is already canonical. Drop any qualifiers as
5734 .debug_names does not contain any. */
5736 if (strchr (name, '(') != NULL)
5738 gdb::unique_xmalloc_ptr<char> without_params
5739 = cp_remove_params (name);
5741 if (without_params != NULL)
5743 name = without_params.get();
5748 cmp = (case_sensitivity == case_sensitive_on ? strcmp : strcasecmp);
5750 const uint32_t full_hash = dwarf5_djb_hash (name);
5752 = extract_unsigned_integer (reinterpret_cast<const gdb_byte *>
5753 (map.bucket_table_reordered
5754 + (full_hash % map.bucket_count)), 4,
5755 map.dwarf5_byte_order);
5759 if (namei >= map.name_count)
5761 complaint (_("Wrong .debug_names with name index %u but name_count=%u "
5763 namei, map.name_count,
5764 objfile_name (map.dwarf2_per_objfile->objfile));
5770 const uint32_t namei_full_hash
5771 = extract_unsigned_integer (reinterpret_cast<const gdb_byte *>
5772 (map.hash_table_reordered + namei), 4,
5773 map.dwarf5_byte_order);
5774 if (full_hash % map.bucket_count != namei_full_hash % map.bucket_count)
5777 if (full_hash == namei_full_hash)
5779 const char *const namei_string = map.namei_to_name (namei);
5781 #if 0 /* An expensive sanity check. */
5782 if (namei_full_hash != dwarf5_djb_hash (namei_string))
5784 complaint (_("Wrong .debug_names hash for string at index %u "
5786 namei, objfile_name (dwarf2_per_objfile->objfile));
5791 if (cmp (namei_string, name) == 0)
5793 const ULONGEST namei_entry_offs
5794 = extract_unsigned_integer ((map.name_table_entry_offs_reordered
5795 + namei * map.offset_size),
5796 map.offset_size, map.dwarf5_byte_order);
5797 return map.entry_pool + namei_entry_offs;
5802 if (namei >= map.name_count)
5808 dw2_debug_names_iterator::find_vec_in_debug_names
5809 (const mapped_debug_names &map, uint32_t namei)
5811 if (namei >= map.name_count)
5813 complaint (_("Wrong .debug_names with name index %u but name_count=%u "
5815 namei, map.name_count,
5816 objfile_name (map.dwarf2_per_objfile->objfile));
5820 const ULONGEST namei_entry_offs
5821 = extract_unsigned_integer ((map.name_table_entry_offs_reordered
5822 + namei * map.offset_size),
5823 map.offset_size, map.dwarf5_byte_order);
5824 return map.entry_pool + namei_entry_offs;
5827 /* See dw2_debug_names_iterator. */
5829 dwarf2_per_cu_data *
5830 dw2_debug_names_iterator::next ()
5835 struct dwarf2_per_objfile *dwarf2_per_objfile = m_map.dwarf2_per_objfile;
5836 struct objfile *objfile = dwarf2_per_objfile->objfile;
5837 bfd *const abfd = objfile->obfd;
5841 unsigned int bytes_read;
5842 const ULONGEST abbrev = read_unsigned_leb128 (abfd, m_addr, &bytes_read);
5843 m_addr += bytes_read;
5847 const auto indexval_it = m_map.abbrev_map.find (abbrev);
5848 if (indexval_it == m_map.abbrev_map.cend ())
5850 complaint (_("Wrong .debug_names undefined abbrev code %s "
5852 pulongest (abbrev), objfile_name (objfile));
5855 const mapped_debug_names::index_val &indexval = indexval_it->second;
5856 bool have_is_static = false;
5858 dwarf2_per_cu_data *per_cu = NULL;
5859 for (const mapped_debug_names::index_val::attr &attr : indexval.attr_vec)
5864 case DW_FORM_implicit_const:
5865 ull = attr.implicit_const;
5867 case DW_FORM_flag_present:
5871 ull = read_unsigned_leb128 (abfd, m_addr, &bytes_read);
5872 m_addr += bytes_read;
5875 complaint (_("Unsupported .debug_names form %s [in module %s]"),
5876 dwarf_form_name (attr.form),
5877 objfile_name (objfile));
5880 switch (attr.dw_idx)
5882 case DW_IDX_compile_unit:
5883 /* Don't crash on bad data. */
5884 if (ull >= dwarf2_per_objfile->all_comp_units.size ())
5886 complaint (_(".debug_names entry has bad CU index %s"
5889 objfile_name (dwarf2_per_objfile->objfile));
5892 per_cu = dwarf2_per_objfile->get_cutu (ull);
5894 case DW_IDX_type_unit:
5895 /* Don't crash on bad data. */
5896 if (ull >= dwarf2_per_objfile->all_type_units.size ())
5898 complaint (_(".debug_names entry has bad TU index %s"
5901 objfile_name (dwarf2_per_objfile->objfile));
5904 per_cu = &dwarf2_per_objfile->get_tu (ull)->per_cu;
5906 case DW_IDX_GNU_internal:
5907 if (!m_map.augmentation_is_gdb)
5909 have_is_static = true;
5912 case DW_IDX_GNU_external:
5913 if (!m_map.augmentation_is_gdb)
5915 have_is_static = true;
5921 /* Skip if already read in. */
5922 if (per_cu->v.quick->compunit_symtab)
5925 /* Check static vs global. */
5928 const bool want_static = m_block_index != GLOBAL_BLOCK;
5929 if (m_want_specific_block && want_static != is_static)
5933 /* Match dw2_symtab_iter_next, symbol_kind
5934 and debug_names::psymbol_tag. */
5938 switch (indexval.dwarf_tag)
5940 case DW_TAG_variable:
5941 case DW_TAG_subprogram:
5942 /* Some types are also in VAR_DOMAIN. */
5943 case DW_TAG_typedef:
5944 case DW_TAG_structure_type:
5951 switch (indexval.dwarf_tag)
5953 case DW_TAG_typedef:
5954 case DW_TAG_structure_type:
5961 switch (indexval.dwarf_tag)
5964 case DW_TAG_variable:
5974 /* Match dw2_expand_symtabs_matching, symbol_kind and
5975 debug_names::psymbol_tag. */
5978 case VARIABLES_DOMAIN:
5979 switch (indexval.dwarf_tag)
5981 case DW_TAG_variable:
5987 case FUNCTIONS_DOMAIN:
5988 switch (indexval.dwarf_tag)
5990 case DW_TAG_subprogram:
5997 switch (indexval.dwarf_tag)
5999 case DW_TAG_typedef:
6000 case DW_TAG_structure_type:
6013 static struct compunit_symtab *
6014 dw2_debug_names_lookup_symbol (struct objfile *objfile, int block_index_int,
6015 const char *name, domain_enum domain)
6017 const block_enum block_index = static_cast<block_enum> (block_index_int);
6018 struct dwarf2_per_objfile *dwarf2_per_objfile
6019 = get_dwarf2_per_objfile (objfile);
6021 const auto &mapp = dwarf2_per_objfile->debug_names_table;
6024 /* index is NULL if OBJF_READNOW. */
6027 const auto &map = *mapp;
6029 dw2_debug_names_iterator iter (map, true /* want_specific_block */,
6030 block_index, domain, name);
6032 struct compunit_symtab *stab_best = NULL;
6033 struct dwarf2_per_cu_data *per_cu;
6034 while ((per_cu = iter.next ()) != NULL)
6036 struct symbol *sym, *with_opaque = NULL;
6037 struct compunit_symtab *stab = dw2_instantiate_symtab (per_cu, false);
6038 const struct blockvector *bv = COMPUNIT_BLOCKVECTOR (stab);
6039 struct block *block = BLOCKVECTOR_BLOCK (bv, block_index);
6041 sym = block_find_symbol (block, name, domain,
6042 block_find_non_opaque_type_preferred,
6045 /* Some caution must be observed with overloaded functions and
6046 methods, since the index will not contain any overload
6047 information (but NAME might contain it). */
6050 && strcmp_iw (SYMBOL_SEARCH_NAME (sym), name) == 0)
6052 if (with_opaque != NULL
6053 && strcmp_iw (SYMBOL_SEARCH_NAME (with_opaque), name) == 0)
6056 /* Keep looking through other CUs. */
6062 /* This dumps minimal information about .debug_names. It is called
6063 via "mt print objfiles". The gdb.dwarf2/gdb-index.exp testcase
6064 uses this to verify that .debug_names has been loaded. */
6067 dw2_debug_names_dump (struct objfile *objfile)
6069 struct dwarf2_per_objfile *dwarf2_per_objfile
6070 = get_dwarf2_per_objfile (objfile);
6072 gdb_assert (dwarf2_per_objfile->using_index);
6073 printf_filtered (".debug_names:");
6074 if (dwarf2_per_objfile->debug_names_table)
6075 printf_filtered (" exists\n");
6077 printf_filtered (" faked for \"readnow\"\n");
6078 printf_filtered ("\n");
6082 dw2_debug_names_expand_symtabs_for_function (struct objfile *objfile,
6083 const char *func_name)
6085 struct dwarf2_per_objfile *dwarf2_per_objfile
6086 = get_dwarf2_per_objfile (objfile);
6088 /* dwarf2_per_objfile->debug_names_table is NULL if OBJF_READNOW. */
6089 if (dwarf2_per_objfile->debug_names_table)
6091 const mapped_debug_names &map = *dwarf2_per_objfile->debug_names_table;
6093 /* Note: It doesn't matter what we pass for block_index here. */
6094 dw2_debug_names_iterator iter (map, false /* want_specific_block */,
6095 GLOBAL_BLOCK, VAR_DOMAIN, func_name);
6097 struct dwarf2_per_cu_data *per_cu;
6098 while ((per_cu = iter.next ()) != NULL)
6099 dw2_instantiate_symtab (per_cu, false);
6104 dw2_debug_names_expand_symtabs_matching
6105 (struct objfile *objfile,
6106 gdb::function_view<expand_symtabs_file_matcher_ftype> file_matcher,
6107 const lookup_name_info &lookup_name,
6108 gdb::function_view<expand_symtabs_symbol_matcher_ftype> symbol_matcher,
6109 gdb::function_view<expand_symtabs_exp_notify_ftype> expansion_notify,
6110 enum search_domain kind)
6112 struct dwarf2_per_objfile *dwarf2_per_objfile
6113 = get_dwarf2_per_objfile (objfile);
6115 /* debug_names_table is NULL if OBJF_READNOW. */
6116 if (!dwarf2_per_objfile->debug_names_table)
6119 dw_expand_symtabs_matching_file_matcher (dwarf2_per_objfile, file_matcher);
6121 mapped_debug_names &map = *dwarf2_per_objfile->debug_names_table;
6123 dw2_expand_symtabs_matching_symbol (map, lookup_name,
6125 kind, [&] (offset_type namei)
6127 /* The name was matched, now expand corresponding CUs that were
6129 dw2_debug_names_iterator iter (map, kind, namei);
6131 struct dwarf2_per_cu_data *per_cu;
6132 while ((per_cu = iter.next ()) != NULL)
6133 dw2_expand_symtabs_matching_one (per_cu, file_matcher,
6138 const struct quick_symbol_functions dwarf2_debug_names_functions =
6141 dw2_find_last_source_symtab,
6142 dw2_forget_cached_source_info,
6143 dw2_map_symtabs_matching_filename,
6144 dw2_debug_names_lookup_symbol,
6146 dw2_debug_names_dump,
6148 dw2_debug_names_expand_symtabs_for_function,
6149 dw2_expand_all_symtabs,
6150 dw2_expand_symtabs_with_fullname,
6151 dw2_map_matching_symbols,
6152 dw2_debug_names_expand_symtabs_matching,
6153 dw2_find_pc_sect_compunit_symtab,
6155 dw2_map_symbol_filenames
6158 /* See symfile.h. */
6161 dwarf2_initialize_objfile (struct objfile *objfile, dw_index_kind *index_kind)
6163 struct dwarf2_per_objfile *dwarf2_per_objfile
6164 = get_dwarf2_per_objfile (objfile);
6166 /* If we're about to read full symbols, don't bother with the
6167 indices. In this case we also don't care if some other debug
6168 format is making psymtabs, because they are all about to be
6170 if ((objfile->flags & OBJF_READNOW))
6172 dwarf2_per_objfile->using_index = 1;
6173 create_all_comp_units (dwarf2_per_objfile);
6174 create_all_type_units (dwarf2_per_objfile);
6175 dwarf2_per_objfile->quick_file_names_table
6176 = create_quick_file_names_table
6177 (dwarf2_per_objfile->all_comp_units.size ());
6179 for (int i = 0; i < (dwarf2_per_objfile->all_comp_units.size ()
6180 + dwarf2_per_objfile->all_type_units.size ()); ++i)
6182 dwarf2_per_cu_data *per_cu = dwarf2_per_objfile->get_cutu (i);
6184 per_cu->v.quick = OBSTACK_ZALLOC (&objfile->objfile_obstack,
6185 struct dwarf2_per_cu_quick_data);
6188 /* Return 1 so that gdb sees the "quick" functions. However,
6189 these functions will be no-ops because we will have expanded
6191 *index_kind = dw_index_kind::GDB_INDEX;
6195 if (dwarf2_read_debug_names (dwarf2_per_objfile))
6197 *index_kind = dw_index_kind::DEBUG_NAMES;
6201 if (dwarf2_read_gdb_index (dwarf2_per_objfile))
6203 *index_kind = dw_index_kind::GDB_INDEX;
6212 /* Build a partial symbol table. */
6215 dwarf2_build_psymtabs (struct objfile *objfile)
6217 struct dwarf2_per_objfile *dwarf2_per_objfile
6218 = get_dwarf2_per_objfile (objfile);
6220 if (objfile->global_psymbols.capacity () == 0
6221 && objfile->static_psymbols.capacity () == 0)
6222 init_psymbol_list (objfile, 1024);
6226 /* This isn't really ideal: all the data we allocate on the
6227 objfile's obstack is still uselessly kept around. However,
6228 freeing it seems unsafe. */
6229 psymtab_discarder psymtabs (objfile);
6230 dwarf2_build_psymtabs_hard (dwarf2_per_objfile);
6233 CATCH (except, RETURN_MASK_ERROR)
6235 exception_print (gdb_stderr, except);
6240 /* Return the total length of the CU described by HEADER. */
6243 get_cu_length (const struct comp_unit_head *header)
6245 return header->initial_length_size + header->length;
6248 /* Return TRUE if SECT_OFF is within CU_HEADER. */
6251 offset_in_cu_p (const comp_unit_head *cu_header, sect_offset sect_off)
6253 sect_offset bottom = cu_header->sect_off;
6254 sect_offset top = cu_header->sect_off + get_cu_length (cu_header);
6256 return sect_off >= bottom && sect_off < top;
6259 /* Find the base address of the compilation unit for range lists and
6260 location lists. It will normally be specified by DW_AT_low_pc.
6261 In DWARF-3 draft 4, the base address could be overridden by
6262 DW_AT_entry_pc. It's been removed, but GCC still uses this for
6263 compilation units with discontinuous ranges. */
6266 dwarf2_find_base_address (struct die_info *die, struct dwarf2_cu *cu)
6268 struct attribute *attr;
6271 cu->base_address = 0;
6273 attr = dwarf2_attr (die, DW_AT_entry_pc, cu);
6276 cu->base_address = attr_value_as_address (attr);
6281 attr = dwarf2_attr (die, DW_AT_low_pc, cu);
6284 cu->base_address = attr_value_as_address (attr);
6290 /* Read in the comp unit header information from the debug_info at info_ptr.
6291 Use rcuh_kind::COMPILE as the default type if not known by the caller.
6292 NOTE: This leaves members offset, first_die_offset to be filled in
6295 static const gdb_byte *
6296 read_comp_unit_head (struct comp_unit_head *cu_header,
6297 const gdb_byte *info_ptr,
6298 struct dwarf2_section_info *section,
6299 rcuh_kind section_kind)
6302 unsigned int bytes_read;
6303 const char *filename = get_section_file_name (section);
6304 bfd *abfd = get_section_bfd_owner (section);
6306 cu_header->length = read_initial_length (abfd, info_ptr, &bytes_read);
6307 cu_header->initial_length_size = bytes_read;
6308 cu_header->offset_size = (bytes_read == 4) ? 4 : 8;
6309 info_ptr += bytes_read;
6310 cu_header->version = read_2_bytes (abfd, info_ptr);
6311 if (cu_header->version < 2 || cu_header->version > 5)
6312 error (_("Dwarf Error: wrong version in compilation unit header "
6313 "(is %d, should be 2, 3, 4 or 5) [in module %s]"),
6314 cu_header->version, filename);
6316 if (cu_header->version < 5)
6317 switch (section_kind)
6319 case rcuh_kind::COMPILE:
6320 cu_header->unit_type = DW_UT_compile;
6322 case rcuh_kind::TYPE:
6323 cu_header->unit_type = DW_UT_type;
6326 internal_error (__FILE__, __LINE__,
6327 _("read_comp_unit_head: invalid section_kind"));
6331 cu_header->unit_type = static_cast<enum dwarf_unit_type>
6332 (read_1_byte (abfd, info_ptr));
6334 switch (cu_header->unit_type)
6337 if (section_kind != rcuh_kind::COMPILE)
6338 error (_("Dwarf Error: wrong unit_type in compilation unit header "
6339 "(is DW_UT_compile, should be DW_UT_type) [in module %s]"),
6343 section_kind = rcuh_kind::TYPE;
6346 error (_("Dwarf Error: wrong unit_type in compilation unit header "
6347 "(is %d, should be %d or %d) [in module %s]"),
6348 cu_header->unit_type, DW_UT_compile, DW_UT_type, filename);
6351 cu_header->addr_size = read_1_byte (abfd, info_ptr);
6354 cu_header->abbrev_sect_off = (sect_offset) read_offset (abfd, info_ptr,
6357 info_ptr += bytes_read;
6358 if (cu_header->version < 5)
6360 cu_header->addr_size = read_1_byte (abfd, info_ptr);
6363 signed_addr = bfd_get_sign_extend_vma (abfd);
6364 if (signed_addr < 0)
6365 internal_error (__FILE__, __LINE__,
6366 _("read_comp_unit_head: dwarf from non elf file"));
6367 cu_header->signed_addr_p = signed_addr;
6369 if (section_kind == rcuh_kind::TYPE)
6371 LONGEST type_offset;
6373 cu_header->signature = read_8_bytes (abfd, info_ptr);
6376 type_offset = read_offset (abfd, info_ptr, cu_header, &bytes_read);
6377 info_ptr += bytes_read;
6378 cu_header->type_cu_offset_in_tu = (cu_offset) type_offset;
6379 if (to_underlying (cu_header->type_cu_offset_in_tu) != type_offset)
6380 error (_("Dwarf Error: Too big type_offset in compilation unit "
6381 "header (is %s) [in module %s]"), plongest (type_offset),
6388 /* Helper function that returns the proper abbrev section for
6391 static struct dwarf2_section_info *
6392 get_abbrev_section_for_cu (struct dwarf2_per_cu_data *this_cu)
6394 struct dwarf2_section_info *abbrev;
6395 struct dwarf2_per_objfile *dwarf2_per_objfile = this_cu->dwarf2_per_objfile;
6397 if (this_cu->is_dwz)
6398 abbrev = &dwarf2_get_dwz_file (dwarf2_per_objfile)->abbrev;
6400 abbrev = &dwarf2_per_objfile->abbrev;
6405 /* Subroutine of read_and_check_comp_unit_head and
6406 read_and_check_type_unit_head to simplify them.
6407 Perform various error checking on the header. */
6410 error_check_comp_unit_head (struct dwarf2_per_objfile *dwarf2_per_objfile,
6411 struct comp_unit_head *header,
6412 struct dwarf2_section_info *section,
6413 struct dwarf2_section_info *abbrev_section)
6415 const char *filename = get_section_file_name (section);
6417 if (to_underlying (header->abbrev_sect_off)
6418 >= dwarf2_section_size (dwarf2_per_objfile->objfile, abbrev_section))
6419 error (_("Dwarf Error: bad offset (%s) in compilation unit header "
6420 "(offset %s + 6) [in module %s]"),
6421 sect_offset_str (header->abbrev_sect_off),
6422 sect_offset_str (header->sect_off),
6425 /* Cast to ULONGEST to use 64-bit arithmetic when possible to
6426 avoid potential 32-bit overflow. */
6427 if (((ULONGEST) header->sect_off + get_cu_length (header))
6429 error (_("Dwarf Error: bad length (0x%x) in compilation unit header "
6430 "(offset %s + 0) [in module %s]"),
6431 header->length, sect_offset_str (header->sect_off),
6435 /* Read in a CU/TU header and perform some basic error checking.
6436 The contents of the header are stored in HEADER.
6437 The result is a pointer to the start of the first DIE. */
6439 static const gdb_byte *
6440 read_and_check_comp_unit_head (struct dwarf2_per_objfile *dwarf2_per_objfile,
6441 struct comp_unit_head *header,
6442 struct dwarf2_section_info *section,
6443 struct dwarf2_section_info *abbrev_section,
6444 const gdb_byte *info_ptr,
6445 rcuh_kind section_kind)
6447 const gdb_byte *beg_of_comp_unit = info_ptr;
6449 header->sect_off = (sect_offset) (beg_of_comp_unit - section->buffer);
6451 info_ptr = read_comp_unit_head (header, info_ptr, section, section_kind);
6453 header->first_die_cu_offset = (cu_offset) (info_ptr - beg_of_comp_unit);
6455 error_check_comp_unit_head (dwarf2_per_objfile, header, section,
6461 /* Fetch the abbreviation table offset from a comp or type unit header. */
6464 read_abbrev_offset (struct dwarf2_per_objfile *dwarf2_per_objfile,
6465 struct dwarf2_section_info *section,
6466 sect_offset sect_off)
6468 bfd *abfd = get_section_bfd_owner (section);
6469 const gdb_byte *info_ptr;
6470 unsigned int initial_length_size, offset_size;
6473 dwarf2_read_section (dwarf2_per_objfile->objfile, section);
6474 info_ptr = section->buffer + to_underlying (sect_off);
6475 read_initial_length (abfd, info_ptr, &initial_length_size);
6476 offset_size = initial_length_size == 4 ? 4 : 8;
6477 info_ptr += initial_length_size;
6479 version = read_2_bytes (abfd, info_ptr);
6483 /* Skip unit type and address size. */
6487 return (sect_offset) read_offset_1 (abfd, info_ptr, offset_size);
6490 /* Allocate a new partial symtab for file named NAME and mark this new
6491 partial symtab as being an include of PST. */
6494 dwarf2_create_include_psymtab (const char *name, struct partial_symtab *pst,
6495 struct objfile *objfile)
6497 struct partial_symtab *subpst = allocate_psymtab (name, objfile);
6499 if (!IS_ABSOLUTE_PATH (subpst->filename))
6501 /* It shares objfile->objfile_obstack. */
6502 subpst->dirname = pst->dirname;
6505 subpst->textlow = 0;
6506 subpst->texthigh = 0;
6508 subpst->dependencies
6509 = XOBNEW (&objfile->objfile_obstack, struct partial_symtab *);
6510 subpst->dependencies[0] = pst;
6511 subpst->number_of_dependencies = 1;
6513 subpst->globals_offset = 0;
6514 subpst->n_global_syms = 0;
6515 subpst->statics_offset = 0;
6516 subpst->n_static_syms = 0;
6517 subpst->compunit_symtab = NULL;
6518 subpst->read_symtab = pst->read_symtab;
6521 /* No private part is necessary for include psymtabs. This property
6522 can be used to differentiate between such include psymtabs and
6523 the regular ones. */
6524 subpst->read_symtab_private = NULL;
6527 /* Read the Line Number Program data and extract the list of files
6528 included by the source file represented by PST. Build an include
6529 partial symtab for each of these included files. */
6532 dwarf2_build_include_psymtabs (struct dwarf2_cu *cu,
6533 struct die_info *die,
6534 struct partial_symtab *pst)
6537 struct attribute *attr;
6539 attr = dwarf2_attr (die, DW_AT_stmt_list, cu);
6541 lh = dwarf_decode_line_header ((sect_offset) DW_UNSND (attr), cu);
6543 return; /* No linetable, so no includes. */
6545 /* NOTE: pst->dirname is DW_AT_comp_dir (if present). */
6546 dwarf_decode_lines (lh.get (), pst->dirname, cu, pst, pst->textlow, 1);
6550 hash_signatured_type (const void *item)
6552 const struct signatured_type *sig_type
6553 = (const struct signatured_type *) item;
6555 /* This drops the top 32 bits of the signature, but is ok for a hash. */
6556 return sig_type->signature;
6560 eq_signatured_type (const void *item_lhs, const void *item_rhs)
6562 const struct signatured_type *lhs = (const struct signatured_type *) item_lhs;
6563 const struct signatured_type *rhs = (const struct signatured_type *) item_rhs;
6565 return lhs->signature == rhs->signature;
6568 /* Allocate a hash table for signatured types. */
6571 allocate_signatured_type_table (struct objfile *objfile)
6573 return htab_create_alloc_ex (41,
6574 hash_signatured_type,
6577 &objfile->objfile_obstack,
6578 hashtab_obstack_allocate,
6579 dummy_obstack_deallocate);
6582 /* A helper function to add a signatured type CU to a table. */
6585 add_signatured_type_cu_to_table (void **slot, void *datum)
6587 struct signatured_type *sigt = (struct signatured_type *) *slot;
6588 std::vector<signatured_type *> *all_type_units
6589 = (std::vector<signatured_type *> *) datum;
6591 all_type_units->push_back (sigt);
6596 /* A helper for create_debug_types_hash_table. Read types from SECTION
6597 and fill them into TYPES_HTAB. It will process only type units,
6598 therefore DW_UT_type. */
6601 create_debug_type_hash_table (struct dwarf2_per_objfile *dwarf2_per_objfile,
6602 struct dwo_file *dwo_file,
6603 dwarf2_section_info *section, htab_t &types_htab,
6604 rcuh_kind section_kind)
6606 struct objfile *objfile = dwarf2_per_objfile->objfile;
6607 struct dwarf2_section_info *abbrev_section;
6609 const gdb_byte *info_ptr, *end_ptr;
6611 abbrev_section = (dwo_file != NULL
6612 ? &dwo_file->sections.abbrev
6613 : &dwarf2_per_objfile->abbrev);
6615 if (dwarf_read_debug)
6616 fprintf_unfiltered (gdb_stdlog, "Reading %s for %s:\n",
6617 get_section_name (section),
6618 get_section_file_name (abbrev_section));
6620 dwarf2_read_section (objfile, section);
6621 info_ptr = section->buffer;
6623 if (info_ptr == NULL)
6626 /* We can't set abfd until now because the section may be empty or
6627 not present, in which case the bfd is unknown. */
6628 abfd = get_section_bfd_owner (section);
6630 /* We don't use init_cutu_and_read_dies_simple, or some such, here
6631 because we don't need to read any dies: the signature is in the
6634 end_ptr = info_ptr + section->size;
6635 while (info_ptr < end_ptr)
6637 struct signatured_type *sig_type;
6638 struct dwo_unit *dwo_tu;
6640 const gdb_byte *ptr = info_ptr;
6641 struct comp_unit_head header;
6642 unsigned int length;
6644 sect_offset sect_off = (sect_offset) (ptr - section->buffer);
6646 /* Initialize it due to a false compiler warning. */
6647 header.signature = -1;
6648 header.type_cu_offset_in_tu = (cu_offset) -1;
6650 /* We need to read the type's signature in order to build the hash
6651 table, but we don't need anything else just yet. */
6653 ptr = read_and_check_comp_unit_head (dwarf2_per_objfile, &header, section,
6654 abbrev_section, ptr, section_kind);
6656 length = get_cu_length (&header);
6658 /* Skip dummy type units. */
6659 if (ptr >= info_ptr + length
6660 || peek_abbrev_code (abfd, ptr) == 0
6661 || header.unit_type != DW_UT_type)
6667 if (types_htab == NULL)
6670 types_htab = allocate_dwo_unit_table (objfile);
6672 types_htab = allocate_signatured_type_table (objfile);
6678 dwo_tu = OBSTACK_ZALLOC (&objfile->objfile_obstack,
6680 dwo_tu->dwo_file = dwo_file;
6681 dwo_tu->signature = header.signature;
6682 dwo_tu->type_offset_in_tu = header.type_cu_offset_in_tu;
6683 dwo_tu->section = section;
6684 dwo_tu->sect_off = sect_off;
6685 dwo_tu->length = length;
6689 /* N.B.: type_offset is not usable if this type uses a DWO file.
6690 The real type_offset is in the DWO file. */
6692 sig_type = OBSTACK_ZALLOC (&objfile->objfile_obstack,
6693 struct signatured_type);
6694 sig_type->signature = header.signature;
6695 sig_type->type_offset_in_tu = header.type_cu_offset_in_tu;
6696 sig_type->per_cu.dwarf2_per_objfile = dwarf2_per_objfile;
6697 sig_type->per_cu.is_debug_types = 1;
6698 sig_type->per_cu.section = section;
6699 sig_type->per_cu.sect_off = sect_off;
6700 sig_type->per_cu.length = length;
6703 slot = htab_find_slot (types_htab,
6704 dwo_file ? (void*) dwo_tu : (void *) sig_type,
6706 gdb_assert (slot != NULL);
6709 sect_offset dup_sect_off;
6713 const struct dwo_unit *dup_tu
6714 = (const struct dwo_unit *) *slot;
6716 dup_sect_off = dup_tu->sect_off;
6720 const struct signatured_type *dup_tu
6721 = (const struct signatured_type *) *slot;
6723 dup_sect_off = dup_tu->per_cu.sect_off;
6726 complaint (_("debug type entry at offset %s is duplicate to"
6727 " the entry at offset %s, signature %s"),
6728 sect_offset_str (sect_off), sect_offset_str (dup_sect_off),
6729 hex_string (header.signature));
6731 *slot = dwo_file ? (void *) dwo_tu : (void *) sig_type;
6733 if (dwarf_read_debug > 1)
6734 fprintf_unfiltered (gdb_stdlog, " offset %s, signature %s\n",
6735 sect_offset_str (sect_off),
6736 hex_string (header.signature));
6742 /* Create the hash table of all entries in the .debug_types
6743 (or .debug_types.dwo) section(s).
6744 If reading a DWO file, then DWO_FILE is a pointer to the DWO file object,
6745 otherwise it is NULL.
6747 The result is a pointer to the hash table or NULL if there are no types.
6749 Note: This function processes DWO files only, not DWP files. */
6752 create_debug_types_hash_table (struct dwarf2_per_objfile *dwarf2_per_objfile,
6753 struct dwo_file *dwo_file,
6754 VEC (dwarf2_section_info_def) *types,
6758 struct dwarf2_section_info *section;
6760 if (VEC_empty (dwarf2_section_info_def, types))
6764 VEC_iterate (dwarf2_section_info_def, types, ix, section);
6766 create_debug_type_hash_table (dwarf2_per_objfile, dwo_file, section,
6767 types_htab, rcuh_kind::TYPE);
6770 /* Create the hash table of all entries in the .debug_types section,
6771 and initialize all_type_units.
6772 The result is zero if there is an error (e.g. missing .debug_types section),
6773 otherwise non-zero. */
6776 create_all_type_units (struct dwarf2_per_objfile *dwarf2_per_objfile)
6778 htab_t types_htab = NULL;
6780 create_debug_type_hash_table (dwarf2_per_objfile, NULL,
6781 &dwarf2_per_objfile->info, types_htab,
6782 rcuh_kind::COMPILE);
6783 create_debug_types_hash_table (dwarf2_per_objfile, NULL,
6784 dwarf2_per_objfile->types, types_htab);
6785 if (types_htab == NULL)
6787 dwarf2_per_objfile->signatured_types = NULL;
6791 dwarf2_per_objfile->signatured_types = types_htab;
6793 gdb_assert (dwarf2_per_objfile->all_type_units.empty ());
6794 dwarf2_per_objfile->all_type_units.reserve (htab_elements (types_htab));
6796 htab_traverse_noresize (types_htab, add_signatured_type_cu_to_table,
6797 &dwarf2_per_objfile->all_type_units);
6802 /* Add an entry for signature SIG to dwarf2_per_objfile->signatured_types.
6803 If SLOT is non-NULL, it is the entry to use in the hash table.
6804 Otherwise we find one. */
6806 static struct signatured_type *
6807 add_type_unit (struct dwarf2_per_objfile *dwarf2_per_objfile, ULONGEST sig,
6810 struct objfile *objfile = dwarf2_per_objfile->objfile;
6812 if (dwarf2_per_objfile->all_type_units.size ()
6813 == dwarf2_per_objfile->all_type_units.capacity ())
6814 ++dwarf2_per_objfile->tu_stats.nr_all_type_units_reallocs;
6816 signatured_type *sig_type = OBSTACK_ZALLOC (&objfile->objfile_obstack,
6817 struct signatured_type);
6819 dwarf2_per_objfile->all_type_units.push_back (sig_type);
6820 sig_type->signature = sig;
6821 sig_type->per_cu.is_debug_types = 1;
6822 if (dwarf2_per_objfile->using_index)
6824 sig_type->per_cu.v.quick =
6825 OBSTACK_ZALLOC (&objfile->objfile_obstack,
6826 struct dwarf2_per_cu_quick_data);
6831 slot = htab_find_slot (dwarf2_per_objfile->signatured_types,
6834 gdb_assert (*slot == NULL);
6836 /* The rest of sig_type must be filled in by the caller. */
6840 /* Subroutine of lookup_dwo_signatured_type and lookup_dwp_signatured_type.
6841 Fill in SIG_ENTRY with DWO_ENTRY. */
6844 fill_in_sig_entry_from_dwo_entry (struct dwarf2_per_objfile *dwarf2_per_objfile,
6845 struct signatured_type *sig_entry,
6846 struct dwo_unit *dwo_entry)
6848 /* Make sure we're not clobbering something we don't expect to. */
6849 gdb_assert (! sig_entry->per_cu.queued);
6850 gdb_assert (sig_entry->per_cu.cu == NULL);
6851 if (dwarf2_per_objfile->using_index)
6853 gdb_assert (sig_entry->per_cu.v.quick != NULL);
6854 gdb_assert (sig_entry->per_cu.v.quick->compunit_symtab == NULL);
6857 gdb_assert (sig_entry->per_cu.v.psymtab == NULL);
6858 gdb_assert (sig_entry->signature == dwo_entry->signature);
6859 gdb_assert (to_underlying (sig_entry->type_offset_in_section) == 0);
6860 gdb_assert (sig_entry->type_unit_group == NULL);
6861 gdb_assert (sig_entry->dwo_unit == NULL);
6863 sig_entry->per_cu.section = dwo_entry->section;
6864 sig_entry->per_cu.sect_off = dwo_entry->sect_off;
6865 sig_entry->per_cu.length = dwo_entry->length;
6866 sig_entry->per_cu.reading_dwo_directly = 1;
6867 sig_entry->per_cu.dwarf2_per_objfile = dwarf2_per_objfile;
6868 sig_entry->type_offset_in_tu = dwo_entry->type_offset_in_tu;
6869 sig_entry->dwo_unit = dwo_entry;
6872 /* Subroutine of lookup_signatured_type.
6873 If we haven't read the TU yet, create the signatured_type data structure
6874 for a TU to be read in directly from a DWO file, bypassing the stub.
6875 This is the "Stay in DWO Optimization": When there is no DWP file and we're
6876 using .gdb_index, then when reading a CU we want to stay in the DWO file
6877 containing that CU. Otherwise we could end up reading several other DWO
6878 files (due to comdat folding) to process the transitive closure of all the
6879 mentioned TUs, and that can be slow. The current DWO file will have every
6880 type signature that it needs.
6881 We only do this for .gdb_index because in the psymtab case we already have
6882 to read all the DWOs to build the type unit groups. */
6884 static struct signatured_type *
6885 lookup_dwo_signatured_type (struct dwarf2_cu *cu, ULONGEST sig)
6887 struct dwarf2_per_objfile *dwarf2_per_objfile
6888 = cu->per_cu->dwarf2_per_objfile;
6889 struct objfile *objfile = dwarf2_per_objfile->objfile;
6890 struct dwo_file *dwo_file;
6891 struct dwo_unit find_dwo_entry, *dwo_entry;
6892 struct signatured_type find_sig_entry, *sig_entry;
6895 gdb_assert (cu->dwo_unit && dwarf2_per_objfile->using_index);
6897 /* If TU skeletons have been removed then we may not have read in any
6899 if (dwarf2_per_objfile->signatured_types == NULL)
6901 dwarf2_per_objfile->signatured_types
6902 = allocate_signatured_type_table (objfile);
6905 /* We only ever need to read in one copy of a signatured type.
6906 Use the global signatured_types array to do our own comdat-folding
6907 of types. If this is the first time we're reading this TU, and
6908 the TU has an entry in .gdb_index, replace the recorded data from
6909 .gdb_index with this TU. */
6911 find_sig_entry.signature = sig;
6912 slot = htab_find_slot (dwarf2_per_objfile->signatured_types,
6913 &find_sig_entry, INSERT);
6914 sig_entry = (struct signatured_type *) *slot;
6916 /* We can get here with the TU already read, *or* in the process of being
6917 read. Don't reassign the global entry to point to this DWO if that's
6918 the case. Also note that if the TU is already being read, it may not
6919 have come from a DWO, the program may be a mix of Fission-compiled
6920 code and non-Fission-compiled code. */
6922 /* Have we already tried to read this TU?
6923 Note: sig_entry can be NULL if the skeleton TU was removed (thus it
6924 needn't exist in the global table yet). */
6925 if (sig_entry != NULL && sig_entry->per_cu.tu_read)
6928 /* Note: cu->dwo_unit is the dwo_unit that references this TU, not the
6929 dwo_unit of the TU itself. */
6930 dwo_file = cu->dwo_unit->dwo_file;
6932 /* Ok, this is the first time we're reading this TU. */
6933 if (dwo_file->tus == NULL)
6935 find_dwo_entry.signature = sig;
6936 dwo_entry = (struct dwo_unit *) htab_find (dwo_file->tus, &find_dwo_entry);
6937 if (dwo_entry == NULL)
6940 /* If the global table doesn't have an entry for this TU, add one. */
6941 if (sig_entry == NULL)
6942 sig_entry = add_type_unit (dwarf2_per_objfile, sig, slot);
6944 fill_in_sig_entry_from_dwo_entry (dwarf2_per_objfile, sig_entry, dwo_entry);
6945 sig_entry->per_cu.tu_read = 1;
6949 /* Subroutine of lookup_signatured_type.
6950 Look up the type for signature SIG, and if we can't find SIG in .gdb_index
6951 then try the DWP file. If the TU stub (skeleton) has been removed then
6952 it won't be in .gdb_index. */
6954 static struct signatured_type *
6955 lookup_dwp_signatured_type (struct dwarf2_cu *cu, ULONGEST sig)
6957 struct dwarf2_per_objfile *dwarf2_per_objfile
6958 = cu->per_cu->dwarf2_per_objfile;
6959 struct objfile *objfile = dwarf2_per_objfile->objfile;
6960 struct dwp_file *dwp_file = get_dwp_file (dwarf2_per_objfile);
6961 struct dwo_unit *dwo_entry;
6962 struct signatured_type find_sig_entry, *sig_entry;
6965 gdb_assert (cu->dwo_unit && dwarf2_per_objfile->using_index);
6966 gdb_assert (dwp_file != NULL);
6968 /* If TU skeletons have been removed then we may not have read in any
6970 if (dwarf2_per_objfile->signatured_types == NULL)
6972 dwarf2_per_objfile->signatured_types
6973 = allocate_signatured_type_table (objfile);
6976 find_sig_entry.signature = sig;
6977 slot = htab_find_slot (dwarf2_per_objfile->signatured_types,
6978 &find_sig_entry, INSERT);
6979 sig_entry = (struct signatured_type *) *slot;
6981 /* Have we already tried to read this TU?
6982 Note: sig_entry can be NULL if the skeleton TU was removed (thus it
6983 needn't exist in the global table yet). */
6984 if (sig_entry != NULL)
6987 if (dwp_file->tus == NULL)
6989 dwo_entry = lookup_dwo_unit_in_dwp (dwarf2_per_objfile, dwp_file, NULL,
6990 sig, 1 /* is_debug_types */);
6991 if (dwo_entry == NULL)
6994 sig_entry = add_type_unit (dwarf2_per_objfile, sig, slot);
6995 fill_in_sig_entry_from_dwo_entry (dwarf2_per_objfile, sig_entry, dwo_entry);
7000 /* Lookup a signature based type for DW_FORM_ref_sig8.
7001 Returns NULL if signature SIG is not present in the table.
7002 It is up to the caller to complain about this. */
7004 static struct signatured_type *
7005 lookup_signatured_type (struct dwarf2_cu *cu, ULONGEST sig)
7007 struct dwarf2_per_objfile *dwarf2_per_objfile
7008 = cu->per_cu->dwarf2_per_objfile;
7011 && dwarf2_per_objfile->using_index)
7013 /* We're in a DWO/DWP file, and we're using .gdb_index.
7014 These cases require special processing. */
7015 if (get_dwp_file (dwarf2_per_objfile) == NULL)
7016 return lookup_dwo_signatured_type (cu, sig);
7018 return lookup_dwp_signatured_type (cu, sig);
7022 struct signatured_type find_entry, *entry;
7024 if (dwarf2_per_objfile->signatured_types == NULL)
7026 find_entry.signature = sig;
7027 entry = ((struct signatured_type *)
7028 htab_find (dwarf2_per_objfile->signatured_types, &find_entry));
7033 /* Low level DIE reading support. */
7035 /* Initialize a die_reader_specs struct from a dwarf2_cu struct. */
7038 init_cu_die_reader (struct die_reader_specs *reader,
7039 struct dwarf2_cu *cu,
7040 struct dwarf2_section_info *section,
7041 struct dwo_file *dwo_file,
7042 struct abbrev_table *abbrev_table)
7044 gdb_assert (section->readin && section->buffer != NULL);
7045 reader->abfd = get_section_bfd_owner (section);
7047 reader->dwo_file = dwo_file;
7048 reader->die_section = section;
7049 reader->buffer = section->buffer;
7050 reader->buffer_end = section->buffer + section->size;
7051 reader->comp_dir = NULL;
7052 reader->abbrev_table = abbrev_table;
7055 /* Subroutine of init_cutu_and_read_dies to simplify it.
7056 Read in the rest of a CU/TU top level DIE from DWO_UNIT.
7057 There's just a lot of work to do, and init_cutu_and_read_dies is big enough
7060 STUB_COMP_UNIT_DIE is for the stub DIE, we copy over certain attributes
7061 from it to the DIE in the DWO. If NULL we are skipping the stub.
7062 STUB_COMP_DIR is similar to STUB_COMP_UNIT_DIE: When reading a TU directly
7063 from the DWO file, bypassing the stub, it contains the DW_AT_comp_dir
7064 attribute of the referencing CU. At most one of STUB_COMP_UNIT_DIE and
7065 STUB_COMP_DIR may be non-NULL.
7066 *RESULT_READER,*RESULT_INFO_PTR,*RESULT_COMP_UNIT_DIE,*RESULT_HAS_CHILDREN
7067 are filled in with the info of the DIE from the DWO file.
7068 *RESULT_DWO_ABBREV_TABLE will be filled in with the abbrev table allocated
7069 from the dwo. Since *RESULT_READER references this abbrev table, it must be
7070 kept around for at least as long as *RESULT_READER.
7072 The result is non-zero if a valid (non-dummy) DIE was found. */
7075 read_cutu_die_from_dwo (struct dwarf2_per_cu_data *this_cu,
7076 struct dwo_unit *dwo_unit,
7077 struct die_info *stub_comp_unit_die,
7078 const char *stub_comp_dir,
7079 struct die_reader_specs *result_reader,
7080 const gdb_byte **result_info_ptr,
7081 struct die_info **result_comp_unit_die,
7082 int *result_has_children,
7083 abbrev_table_up *result_dwo_abbrev_table)
7085 struct dwarf2_per_objfile *dwarf2_per_objfile = this_cu->dwarf2_per_objfile;
7086 struct objfile *objfile = dwarf2_per_objfile->objfile;
7087 struct dwarf2_cu *cu = this_cu->cu;
7089 const gdb_byte *begin_info_ptr, *info_ptr;
7090 struct attribute *comp_dir, *stmt_list, *low_pc, *high_pc, *ranges;
7091 int i,num_extra_attrs;
7092 struct dwarf2_section_info *dwo_abbrev_section;
7093 struct attribute *attr;
7094 struct die_info *comp_unit_die;
7096 /* At most one of these may be provided. */
7097 gdb_assert ((stub_comp_unit_die != NULL) + (stub_comp_dir != NULL) <= 1);
7099 /* These attributes aren't processed until later:
7100 DW_AT_stmt_list, DW_AT_low_pc, DW_AT_high_pc, DW_AT_ranges.
7101 DW_AT_comp_dir is used now, to find the DWO file, but it is also
7102 referenced later. However, these attributes are found in the stub
7103 which we won't have later. In order to not impose this complication
7104 on the rest of the code, we read them here and copy them to the
7113 if (stub_comp_unit_die != NULL)
7115 /* For TUs in DWO files, the DW_AT_stmt_list attribute lives in the
7117 if (! this_cu->is_debug_types)
7118 stmt_list = dwarf2_attr (stub_comp_unit_die, DW_AT_stmt_list, cu);
7119 low_pc = dwarf2_attr (stub_comp_unit_die, DW_AT_low_pc, cu);
7120 high_pc = dwarf2_attr (stub_comp_unit_die, DW_AT_high_pc, cu);
7121 ranges = dwarf2_attr (stub_comp_unit_die, DW_AT_ranges, cu);
7122 comp_dir = dwarf2_attr (stub_comp_unit_die, DW_AT_comp_dir, cu);
7124 /* There should be a DW_AT_addr_base attribute here (if needed).
7125 We need the value before we can process DW_FORM_GNU_addr_index. */
7127 attr = dwarf2_attr (stub_comp_unit_die, DW_AT_GNU_addr_base, cu);
7129 cu->addr_base = DW_UNSND (attr);
7131 /* There should be a DW_AT_ranges_base attribute here (if needed).
7132 We need the value before we can process DW_AT_ranges. */
7133 cu->ranges_base = 0;
7134 attr = dwarf2_attr (stub_comp_unit_die, DW_AT_GNU_ranges_base, cu);
7136 cu->ranges_base = DW_UNSND (attr);
7138 else if (stub_comp_dir != NULL)
7140 /* Reconstruct the comp_dir attribute to simplify the code below. */
7141 comp_dir = XOBNEW (&cu->comp_unit_obstack, struct attribute);
7142 comp_dir->name = DW_AT_comp_dir;
7143 comp_dir->form = DW_FORM_string;
7144 DW_STRING_IS_CANONICAL (comp_dir) = 0;
7145 DW_STRING (comp_dir) = stub_comp_dir;
7148 /* Set up for reading the DWO CU/TU. */
7149 cu->dwo_unit = dwo_unit;
7150 dwarf2_section_info *section = dwo_unit->section;
7151 dwarf2_read_section (objfile, section);
7152 abfd = get_section_bfd_owner (section);
7153 begin_info_ptr = info_ptr = (section->buffer
7154 + to_underlying (dwo_unit->sect_off));
7155 dwo_abbrev_section = &dwo_unit->dwo_file->sections.abbrev;
7157 if (this_cu->is_debug_types)
7159 struct signatured_type *sig_type = (struct signatured_type *) this_cu;
7161 info_ptr = read_and_check_comp_unit_head (dwarf2_per_objfile,
7162 &cu->header, section,
7164 info_ptr, rcuh_kind::TYPE);
7165 /* This is not an assert because it can be caused by bad debug info. */
7166 if (sig_type->signature != cu->header.signature)
7168 error (_("Dwarf Error: signature mismatch %s vs %s while reading"
7169 " TU at offset %s [in module %s]"),
7170 hex_string (sig_type->signature),
7171 hex_string (cu->header.signature),
7172 sect_offset_str (dwo_unit->sect_off),
7173 bfd_get_filename (abfd));
7175 gdb_assert (dwo_unit->sect_off == cu->header.sect_off);
7176 /* For DWOs coming from DWP files, we don't know the CU length
7177 nor the type's offset in the TU until now. */
7178 dwo_unit->length = get_cu_length (&cu->header);
7179 dwo_unit->type_offset_in_tu = cu->header.type_cu_offset_in_tu;
7181 /* Establish the type offset that can be used to lookup the type.
7182 For DWO files, we don't know it until now. */
7183 sig_type->type_offset_in_section
7184 = dwo_unit->sect_off + to_underlying (dwo_unit->type_offset_in_tu);
7188 info_ptr = read_and_check_comp_unit_head (dwarf2_per_objfile,
7189 &cu->header, section,
7191 info_ptr, rcuh_kind::COMPILE);
7192 gdb_assert (dwo_unit->sect_off == cu->header.sect_off);
7193 /* For DWOs coming from DWP files, we don't know the CU length
7195 dwo_unit->length = get_cu_length (&cu->header);
7198 *result_dwo_abbrev_table
7199 = abbrev_table_read_table (dwarf2_per_objfile, dwo_abbrev_section,
7200 cu->header.abbrev_sect_off);
7201 init_cu_die_reader (result_reader, cu, section, dwo_unit->dwo_file,
7202 result_dwo_abbrev_table->get ());
7204 /* Read in the die, but leave space to copy over the attributes
7205 from the stub. This has the benefit of simplifying the rest of
7206 the code - all the work to maintain the illusion of a single
7207 DW_TAG_{compile,type}_unit DIE is done here. */
7208 num_extra_attrs = ((stmt_list != NULL)
7212 + (comp_dir != NULL));
7213 info_ptr = read_full_die_1 (result_reader, result_comp_unit_die, info_ptr,
7214 result_has_children, num_extra_attrs);
7216 /* Copy over the attributes from the stub to the DIE we just read in. */
7217 comp_unit_die = *result_comp_unit_die;
7218 i = comp_unit_die->num_attrs;
7219 if (stmt_list != NULL)
7220 comp_unit_die->attrs[i++] = *stmt_list;
7222 comp_unit_die->attrs[i++] = *low_pc;
7223 if (high_pc != NULL)
7224 comp_unit_die->attrs[i++] = *high_pc;
7226 comp_unit_die->attrs[i++] = *ranges;
7227 if (comp_dir != NULL)
7228 comp_unit_die->attrs[i++] = *comp_dir;
7229 comp_unit_die->num_attrs += num_extra_attrs;
7231 if (dwarf_die_debug)
7233 fprintf_unfiltered (gdb_stdlog,
7234 "Read die from %s@0x%x of %s:\n",
7235 get_section_name (section),
7236 (unsigned) (begin_info_ptr - section->buffer),
7237 bfd_get_filename (abfd));
7238 dump_die (comp_unit_die, dwarf_die_debug);
7241 /* Save the comp_dir attribute. If there is no DWP file then we'll read
7242 TUs by skipping the stub and going directly to the entry in the DWO file.
7243 However, skipping the stub means we won't get DW_AT_comp_dir, so we have
7244 to get it via circuitous means. Blech. */
7245 if (comp_dir != NULL)
7246 result_reader->comp_dir = DW_STRING (comp_dir);
7248 /* Skip dummy compilation units. */
7249 if (info_ptr >= begin_info_ptr + dwo_unit->length
7250 || peek_abbrev_code (abfd, info_ptr) == 0)
7253 *result_info_ptr = info_ptr;
7257 /* Subroutine of init_cutu_and_read_dies to simplify it.
7258 Look up the DWO unit specified by COMP_UNIT_DIE of THIS_CU.
7259 Returns NULL if the specified DWO unit cannot be found. */
7261 static struct dwo_unit *
7262 lookup_dwo_unit (struct dwarf2_per_cu_data *this_cu,
7263 struct die_info *comp_unit_die)
7265 struct dwarf2_cu *cu = this_cu->cu;
7267 struct dwo_unit *dwo_unit;
7268 const char *comp_dir, *dwo_name;
7270 gdb_assert (cu != NULL);
7272 /* Yeah, we look dwo_name up again, but it simplifies the code. */
7273 dwo_name = dwarf2_string_attr (comp_unit_die, DW_AT_GNU_dwo_name, cu);
7274 comp_dir = dwarf2_string_attr (comp_unit_die, DW_AT_comp_dir, cu);
7276 if (this_cu->is_debug_types)
7278 struct signatured_type *sig_type;
7280 /* Since this_cu is the first member of struct signatured_type,
7281 we can go from a pointer to one to a pointer to the other. */
7282 sig_type = (struct signatured_type *) this_cu;
7283 signature = sig_type->signature;
7284 dwo_unit = lookup_dwo_type_unit (sig_type, dwo_name, comp_dir);
7288 struct attribute *attr;
7290 attr = dwarf2_attr (comp_unit_die, DW_AT_GNU_dwo_id, cu);
7292 error (_("Dwarf Error: missing dwo_id for dwo_name %s"
7294 dwo_name, objfile_name (this_cu->dwarf2_per_objfile->objfile));
7295 signature = DW_UNSND (attr);
7296 dwo_unit = lookup_dwo_comp_unit (this_cu, dwo_name, comp_dir,
7303 /* Subroutine of init_cutu_and_read_dies to simplify it.
7304 See it for a description of the parameters.
7305 Read a TU directly from a DWO file, bypassing the stub. */
7308 init_tu_and_read_dwo_dies (struct dwarf2_per_cu_data *this_cu,
7309 int use_existing_cu, int keep,
7310 die_reader_func_ftype *die_reader_func,
7313 std::unique_ptr<dwarf2_cu> new_cu;
7314 struct signatured_type *sig_type;
7315 struct die_reader_specs reader;
7316 const gdb_byte *info_ptr;
7317 struct die_info *comp_unit_die;
7319 struct dwarf2_per_objfile *dwarf2_per_objfile = this_cu->dwarf2_per_objfile;
7321 /* Verify we can do the following downcast, and that we have the
7323 gdb_assert (this_cu->is_debug_types && this_cu->reading_dwo_directly);
7324 sig_type = (struct signatured_type *) this_cu;
7325 gdb_assert (sig_type->dwo_unit != NULL);
7327 if (use_existing_cu && this_cu->cu != NULL)
7329 gdb_assert (this_cu->cu->dwo_unit == sig_type->dwo_unit);
7330 /* There's no need to do the rereading_dwo_cu handling that
7331 init_cutu_and_read_dies does since we don't read the stub. */
7335 /* If !use_existing_cu, this_cu->cu must be NULL. */
7336 gdb_assert (this_cu->cu == NULL);
7337 new_cu.reset (new dwarf2_cu (this_cu));
7340 /* A future optimization, if needed, would be to use an existing
7341 abbrev table. When reading DWOs with skeletonless TUs, all the TUs
7342 could share abbrev tables. */
7344 /* The abbreviation table used by READER, this must live at least as long as
7346 abbrev_table_up dwo_abbrev_table;
7348 if (read_cutu_die_from_dwo (this_cu, sig_type->dwo_unit,
7349 NULL /* stub_comp_unit_die */,
7350 sig_type->dwo_unit->dwo_file->comp_dir,
7352 &comp_unit_die, &has_children,
7353 &dwo_abbrev_table) == 0)
7359 /* All the "real" work is done here. */
7360 die_reader_func (&reader, info_ptr, comp_unit_die, has_children, data);
7362 /* This duplicates the code in init_cutu_and_read_dies,
7363 but the alternative is making the latter more complex.
7364 This function is only for the special case of using DWO files directly:
7365 no point in overly complicating the general case just to handle this. */
7366 if (new_cu != NULL && keep)
7368 /* Link this CU into read_in_chain. */
7369 this_cu->cu->read_in_chain = dwarf2_per_objfile->read_in_chain;
7370 dwarf2_per_objfile->read_in_chain = this_cu;
7371 /* The chain owns it now. */
7376 /* Initialize a CU (or TU) and read its DIEs.
7377 If the CU defers to a DWO file, read the DWO file as well.
7379 ABBREV_TABLE, if non-NULL, is the abbreviation table to use.
7380 Otherwise the table specified in the comp unit header is read in and used.
7381 This is an optimization for when we already have the abbrev table.
7383 If USE_EXISTING_CU is non-zero, and THIS_CU->cu is non-NULL, then use it.
7384 Otherwise, a new CU is allocated with xmalloc.
7386 If KEEP is non-zero, then if we allocated a dwarf2_cu we add it to
7387 read_in_chain. Otherwise the dwarf2_cu data is freed at the end.
7389 WARNING: If THIS_CU is a "dummy CU" (used as filler by the incremental
7390 linker) then DIE_READER_FUNC will not get called. */
7393 init_cutu_and_read_dies (struct dwarf2_per_cu_data *this_cu,
7394 struct abbrev_table *abbrev_table,
7395 int use_existing_cu, int keep,
7397 die_reader_func_ftype *die_reader_func,
7400 struct dwarf2_per_objfile *dwarf2_per_objfile = this_cu->dwarf2_per_objfile;
7401 struct objfile *objfile = dwarf2_per_objfile->objfile;
7402 struct dwarf2_section_info *section = this_cu->section;
7403 bfd *abfd = get_section_bfd_owner (section);
7404 struct dwarf2_cu *cu;
7405 const gdb_byte *begin_info_ptr, *info_ptr;
7406 struct die_reader_specs reader;
7407 struct die_info *comp_unit_die;
7409 struct attribute *attr;
7410 struct signatured_type *sig_type = NULL;
7411 struct dwarf2_section_info *abbrev_section;
7412 /* Non-zero if CU currently points to a DWO file and we need to
7413 reread it. When this happens we need to reread the skeleton die
7414 before we can reread the DWO file (this only applies to CUs, not TUs). */
7415 int rereading_dwo_cu = 0;
7417 if (dwarf_die_debug)
7418 fprintf_unfiltered (gdb_stdlog, "Reading %s unit at offset %s\n",
7419 this_cu->is_debug_types ? "type" : "comp",
7420 sect_offset_str (this_cu->sect_off));
7422 if (use_existing_cu)
7425 /* If we're reading a TU directly from a DWO file, including a virtual DWO
7426 file (instead of going through the stub), short-circuit all of this. */
7427 if (this_cu->reading_dwo_directly)
7429 /* Narrow down the scope of possibilities to have to understand. */
7430 gdb_assert (this_cu->is_debug_types);
7431 gdb_assert (abbrev_table == NULL);
7432 init_tu_and_read_dwo_dies (this_cu, use_existing_cu, keep,
7433 die_reader_func, data);
7437 /* This is cheap if the section is already read in. */
7438 dwarf2_read_section (objfile, section);
7440 begin_info_ptr = info_ptr = section->buffer + to_underlying (this_cu->sect_off);
7442 abbrev_section = get_abbrev_section_for_cu (this_cu);
7444 std::unique_ptr<dwarf2_cu> new_cu;
7445 if (use_existing_cu && this_cu->cu != NULL)
7448 /* If this CU is from a DWO file we need to start over, we need to
7449 refetch the attributes from the skeleton CU.
7450 This could be optimized by retrieving those attributes from when we
7451 were here the first time: the previous comp_unit_die was stored in
7452 comp_unit_obstack. But there's no data yet that we need this
7454 if (cu->dwo_unit != NULL)
7455 rereading_dwo_cu = 1;
7459 /* If !use_existing_cu, this_cu->cu must be NULL. */
7460 gdb_assert (this_cu->cu == NULL);
7461 new_cu.reset (new dwarf2_cu (this_cu));
7465 /* Get the header. */
7466 if (to_underlying (cu->header.first_die_cu_offset) != 0 && !rereading_dwo_cu)
7468 /* We already have the header, there's no need to read it in again. */
7469 info_ptr += to_underlying (cu->header.first_die_cu_offset);
7473 if (this_cu->is_debug_types)
7475 info_ptr = read_and_check_comp_unit_head (dwarf2_per_objfile,
7476 &cu->header, section,
7477 abbrev_section, info_ptr,
7480 /* Since per_cu is the first member of struct signatured_type,
7481 we can go from a pointer to one to a pointer to the other. */
7482 sig_type = (struct signatured_type *) this_cu;
7483 gdb_assert (sig_type->signature == cu->header.signature);
7484 gdb_assert (sig_type->type_offset_in_tu
7485 == cu->header.type_cu_offset_in_tu);
7486 gdb_assert (this_cu->sect_off == cu->header.sect_off);
7488 /* LENGTH has not been set yet for type units if we're
7489 using .gdb_index. */
7490 this_cu->length = get_cu_length (&cu->header);
7492 /* Establish the type offset that can be used to lookup the type. */
7493 sig_type->type_offset_in_section =
7494 this_cu->sect_off + to_underlying (sig_type->type_offset_in_tu);
7496 this_cu->dwarf_version = cu->header.version;
7500 info_ptr = read_and_check_comp_unit_head (dwarf2_per_objfile,
7501 &cu->header, section,
7504 rcuh_kind::COMPILE);
7506 gdb_assert (this_cu->sect_off == cu->header.sect_off);
7507 gdb_assert (this_cu->length == get_cu_length (&cu->header));
7508 this_cu->dwarf_version = cu->header.version;
7512 /* Skip dummy compilation units. */
7513 if (info_ptr >= begin_info_ptr + this_cu->length
7514 || peek_abbrev_code (abfd, info_ptr) == 0)
7517 /* If we don't have them yet, read the abbrevs for this compilation unit.
7518 And if we need to read them now, make sure they're freed when we're
7519 done (own the table through ABBREV_TABLE_HOLDER). */
7520 abbrev_table_up abbrev_table_holder;
7521 if (abbrev_table != NULL)
7522 gdb_assert (cu->header.abbrev_sect_off == abbrev_table->sect_off);
7526 = abbrev_table_read_table (dwarf2_per_objfile, abbrev_section,
7527 cu->header.abbrev_sect_off);
7528 abbrev_table = abbrev_table_holder.get ();
7531 /* Read the top level CU/TU die. */
7532 init_cu_die_reader (&reader, cu, section, NULL, abbrev_table);
7533 info_ptr = read_full_die (&reader, &comp_unit_die, info_ptr, &has_children);
7535 if (skip_partial && comp_unit_die->tag == DW_TAG_partial_unit)
7538 /* If we are in a DWO stub, process it and then read in the "real" CU/TU
7539 from the DWO file. read_cutu_die_from_dwo will allocate the abbreviation
7540 table from the DWO file and pass the ownership over to us. It will be
7541 referenced from READER, so we must make sure to free it after we're done
7544 Note that if USE_EXISTING_OK != 0, and THIS_CU->cu already contains a
7545 DWO CU, that this test will fail (the attribute will not be present). */
7546 attr = dwarf2_attr (comp_unit_die, DW_AT_GNU_dwo_name, cu);
7547 abbrev_table_up dwo_abbrev_table;
7550 struct dwo_unit *dwo_unit;
7551 struct die_info *dwo_comp_unit_die;
7555 complaint (_("compilation unit with DW_AT_GNU_dwo_name"
7556 " has children (offset %s) [in module %s]"),
7557 sect_offset_str (this_cu->sect_off),
7558 bfd_get_filename (abfd));
7560 dwo_unit = lookup_dwo_unit (this_cu, comp_unit_die);
7561 if (dwo_unit != NULL)
7563 if (read_cutu_die_from_dwo (this_cu, dwo_unit,
7564 comp_unit_die, NULL,
7566 &dwo_comp_unit_die, &has_children,
7567 &dwo_abbrev_table) == 0)
7572 comp_unit_die = dwo_comp_unit_die;
7576 /* Yikes, we couldn't find the rest of the DIE, we only have
7577 the stub. A complaint has already been logged. There's
7578 not much more we can do except pass on the stub DIE to
7579 die_reader_func. We don't want to throw an error on bad
7584 /* All of the above is setup for this call. Yikes. */
7585 die_reader_func (&reader, info_ptr, comp_unit_die, has_children, data);
7587 /* Done, clean up. */
7588 if (new_cu != NULL && keep)
7590 /* Link this CU into read_in_chain. */
7591 this_cu->cu->read_in_chain = dwarf2_per_objfile->read_in_chain;
7592 dwarf2_per_objfile->read_in_chain = this_cu;
7593 /* The chain owns it now. */
7598 /* Read CU/TU THIS_CU but do not follow DW_AT_GNU_dwo_name if present.
7599 DWO_FILE, if non-NULL, is the DWO file to read (the caller is assumed
7600 to have already done the lookup to find the DWO file).
7602 The caller is required to fill in THIS_CU->section, THIS_CU->offset, and
7603 THIS_CU->is_debug_types, but nothing else.
7605 We fill in THIS_CU->length.
7607 WARNING: If THIS_CU is a "dummy CU" (used as filler by the incremental
7608 linker) then DIE_READER_FUNC will not get called.
7610 THIS_CU->cu is always freed when done.
7611 This is done in order to not leave THIS_CU->cu in a state where we have
7612 to care whether it refers to the "main" CU or the DWO CU. */
7615 init_cutu_and_read_dies_no_follow (struct dwarf2_per_cu_data *this_cu,
7616 struct dwo_file *dwo_file,
7617 die_reader_func_ftype *die_reader_func,
7620 struct dwarf2_per_objfile *dwarf2_per_objfile = this_cu->dwarf2_per_objfile;
7621 struct objfile *objfile = dwarf2_per_objfile->objfile;
7622 struct dwarf2_section_info *section = this_cu->section;
7623 bfd *abfd = get_section_bfd_owner (section);
7624 struct dwarf2_section_info *abbrev_section;
7625 const gdb_byte *begin_info_ptr, *info_ptr;
7626 struct die_reader_specs reader;
7627 struct die_info *comp_unit_die;
7630 if (dwarf_die_debug)
7631 fprintf_unfiltered (gdb_stdlog, "Reading %s unit at offset %s\n",
7632 this_cu->is_debug_types ? "type" : "comp",
7633 sect_offset_str (this_cu->sect_off));
7635 gdb_assert (this_cu->cu == NULL);
7637 abbrev_section = (dwo_file != NULL
7638 ? &dwo_file->sections.abbrev
7639 : get_abbrev_section_for_cu (this_cu));
7641 /* This is cheap if the section is already read in. */
7642 dwarf2_read_section (objfile, section);
7644 struct dwarf2_cu cu (this_cu);
7646 begin_info_ptr = info_ptr = section->buffer + to_underlying (this_cu->sect_off);
7647 info_ptr = read_and_check_comp_unit_head (dwarf2_per_objfile,
7648 &cu.header, section,
7649 abbrev_section, info_ptr,
7650 (this_cu->is_debug_types
7652 : rcuh_kind::COMPILE));
7654 this_cu->length = get_cu_length (&cu.header);
7656 /* Skip dummy compilation units. */
7657 if (info_ptr >= begin_info_ptr + this_cu->length
7658 || peek_abbrev_code (abfd, info_ptr) == 0)
7661 abbrev_table_up abbrev_table
7662 = abbrev_table_read_table (dwarf2_per_objfile, abbrev_section,
7663 cu.header.abbrev_sect_off);
7665 init_cu_die_reader (&reader, &cu, section, dwo_file, abbrev_table.get ());
7666 info_ptr = read_full_die (&reader, &comp_unit_die, info_ptr, &has_children);
7668 die_reader_func (&reader, info_ptr, comp_unit_die, has_children, data);
7671 /* Read a CU/TU, except that this does not look for DW_AT_GNU_dwo_name and
7672 does not lookup the specified DWO file.
7673 This cannot be used to read DWO files.
7675 THIS_CU->cu is always freed when done.
7676 This is done in order to not leave THIS_CU->cu in a state where we have
7677 to care whether it refers to the "main" CU or the DWO CU.
7678 We can revisit this if the data shows there's a performance issue. */
7681 init_cutu_and_read_dies_simple (struct dwarf2_per_cu_data *this_cu,
7682 die_reader_func_ftype *die_reader_func,
7685 init_cutu_and_read_dies_no_follow (this_cu, NULL, die_reader_func, data);
7688 /* Type Unit Groups.
7690 Type Unit Groups are a way to collapse the set of all TUs (type units) into
7691 a more manageable set. The grouping is done by DW_AT_stmt_list entry
7692 so that all types coming from the same compilation (.o file) are grouped
7693 together. A future step could be to put the types in the same symtab as
7694 the CU the types ultimately came from. */
7697 hash_type_unit_group (const void *item)
7699 const struct type_unit_group *tu_group
7700 = (const struct type_unit_group *) item;
7702 return hash_stmt_list_entry (&tu_group->hash);
7706 eq_type_unit_group (const void *item_lhs, const void *item_rhs)
7708 const struct type_unit_group *lhs = (const struct type_unit_group *) item_lhs;
7709 const struct type_unit_group *rhs = (const struct type_unit_group *) item_rhs;
7711 return eq_stmt_list_entry (&lhs->hash, &rhs->hash);
7714 /* Allocate a hash table for type unit groups. */
7717 allocate_type_unit_groups_table (struct objfile *objfile)
7719 return htab_create_alloc_ex (3,
7720 hash_type_unit_group,
7723 &objfile->objfile_obstack,
7724 hashtab_obstack_allocate,
7725 dummy_obstack_deallocate);
7728 /* Type units that don't have DW_AT_stmt_list are grouped into their own
7729 partial symtabs. We combine several TUs per psymtab to not let the size
7730 of any one psymtab grow too big. */
7731 #define NO_STMT_LIST_TYPE_UNIT_PSYMTAB (1 << 31)
7732 #define NO_STMT_LIST_TYPE_UNIT_PSYMTAB_SIZE 10
7734 /* Helper routine for get_type_unit_group.
7735 Create the type_unit_group object used to hold one or more TUs. */
7737 static struct type_unit_group *
7738 create_type_unit_group (struct dwarf2_cu *cu, sect_offset line_offset_struct)
7740 struct dwarf2_per_objfile *dwarf2_per_objfile
7741 = cu->per_cu->dwarf2_per_objfile;
7742 struct objfile *objfile = dwarf2_per_objfile->objfile;
7743 struct dwarf2_per_cu_data *per_cu;
7744 struct type_unit_group *tu_group;
7746 tu_group = OBSTACK_ZALLOC (&objfile->objfile_obstack,
7747 struct type_unit_group);
7748 per_cu = &tu_group->per_cu;
7749 per_cu->dwarf2_per_objfile = dwarf2_per_objfile;
7751 if (dwarf2_per_objfile->using_index)
7753 per_cu->v.quick = OBSTACK_ZALLOC (&objfile->objfile_obstack,
7754 struct dwarf2_per_cu_quick_data);
7758 unsigned int line_offset = to_underlying (line_offset_struct);
7759 struct partial_symtab *pst;
7762 /* Give the symtab a useful name for debug purposes. */
7763 if ((line_offset & NO_STMT_LIST_TYPE_UNIT_PSYMTAB) != 0)
7764 name = xstrprintf ("<type_units_%d>",
7765 (line_offset & ~NO_STMT_LIST_TYPE_UNIT_PSYMTAB));
7767 name = xstrprintf ("<type_units_at_0x%x>", line_offset);
7769 pst = create_partial_symtab (per_cu, name);
7775 tu_group->hash.dwo_unit = cu->dwo_unit;
7776 tu_group->hash.line_sect_off = line_offset_struct;
7781 /* Look up the type_unit_group for type unit CU, and create it if necessary.
7782 STMT_LIST is a DW_AT_stmt_list attribute. */
7784 static struct type_unit_group *
7785 get_type_unit_group (struct dwarf2_cu *cu, const struct attribute *stmt_list)
7787 struct dwarf2_per_objfile *dwarf2_per_objfile
7788 = cu->per_cu->dwarf2_per_objfile;
7789 struct tu_stats *tu_stats = &dwarf2_per_objfile->tu_stats;
7790 struct type_unit_group *tu_group;
7792 unsigned int line_offset;
7793 struct type_unit_group type_unit_group_for_lookup;
7795 if (dwarf2_per_objfile->type_unit_groups == NULL)
7797 dwarf2_per_objfile->type_unit_groups =
7798 allocate_type_unit_groups_table (dwarf2_per_objfile->objfile);
7801 /* Do we need to create a new group, or can we use an existing one? */
7805 line_offset = DW_UNSND (stmt_list);
7806 ++tu_stats->nr_symtab_sharers;
7810 /* Ugh, no stmt_list. Rare, but we have to handle it.
7811 We can do various things here like create one group per TU or
7812 spread them over multiple groups to split up the expansion work.
7813 To avoid worst case scenarios (too many groups or too large groups)
7814 we, umm, group them in bunches. */
7815 line_offset = (NO_STMT_LIST_TYPE_UNIT_PSYMTAB
7816 | (tu_stats->nr_stmt_less_type_units
7817 / NO_STMT_LIST_TYPE_UNIT_PSYMTAB_SIZE));
7818 ++tu_stats->nr_stmt_less_type_units;
7821 type_unit_group_for_lookup.hash.dwo_unit = cu->dwo_unit;
7822 type_unit_group_for_lookup.hash.line_sect_off = (sect_offset) line_offset;
7823 slot = htab_find_slot (dwarf2_per_objfile->type_unit_groups,
7824 &type_unit_group_for_lookup, INSERT);
7827 tu_group = (struct type_unit_group *) *slot;
7828 gdb_assert (tu_group != NULL);
7832 sect_offset line_offset_struct = (sect_offset) line_offset;
7833 tu_group = create_type_unit_group (cu, line_offset_struct);
7835 ++tu_stats->nr_symtabs;
7841 /* Partial symbol tables. */
7843 /* Create a psymtab named NAME and assign it to PER_CU.
7845 The caller must fill in the following details:
7846 dirname, textlow, texthigh. */
7848 static struct partial_symtab *
7849 create_partial_symtab (struct dwarf2_per_cu_data *per_cu, const char *name)
7851 struct objfile *objfile = per_cu->dwarf2_per_objfile->objfile;
7852 struct partial_symtab *pst;
7854 pst = start_psymtab_common (objfile, name, 0,
7855 objfile->global_psymbols,
7856 objfile->static_psymbols);
7858 pst->psymtabs_addrmap_supported = 1;
7860 /* This is the glue that links PST into GDB's symbol API. */
7861 pst->read_symtab_private = per_cu;
7862 pst->read_symtab = dwarf2_read_symtab;
7863 per_cu->v.psymtab = pst;
7868 /* The DATA object passed to process_psymtab_comp_unit_reader has this
7871 struct process_psymtab_comp_unit_data
7873 /* True if we are reading a DW_TAG_partial_unit. */
7875 int want_partial_unit;
7877 /* The "pretend" language that is used if the CU doesn't declare a
7880 enum language pretend_language;
7883 /* die_reader_func for process_psymtab_comp_unit. */
7886 process_psymtab_comp_unit_reader (const struct die_reader_specs *reader,
7887 const gdb_byte *info_ptr,
7888 struct die_info *comp_unit_die,
7892 struct dwarf2_cu *cu = reader->cu;
7893 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
7894 struct gdbarch *gdbarch = get_objfile_arch (objfile);
7895 struct dwarf2_per_cu_data *per_cu = cu->per_cu;
7897 CORE_ADDR best_lowpc = 0, best_highpc = 0;
7898 struct partial_symtab *pst;
7899 enum pc_bounds_kind cu_bounds_kind;
7900 const char *filename;
7901 struct process_psymtab_comp_unit_data *info
7902 = (struct process_psymtab_comp_unit_data *) data;
7904 if (comp_unit_die->tag == DW_TAG_partial_unit && !info->want_partial_unit)
7907 gdb_assert (! per_cu->is_debug_types);
7909 prepare_one_comp_unit (cu, comp_unit_die, info->pretend_language);
7911 cu->list_in_scope = &file_symbols;
7913 /* Allocate a new partial symbol table structure. */
7914 filename = dwarf2_string_attr (comp_unit_die, DW_AT_name, cu);
7915 if (filename == NULL)
7918 pst = create_partial_symtab (per_cu, filename);
7920 /* This must be done before calling dwarf2_build_include_psymtabs. */
7921 pst->dirname = dwarf2_string_attr (comp_unit_die, DW_AT_comp_dir, cu);
7923 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
7925 dwarf2_find_base_address (comp_unit_die, cu);
7927 /* Possibly set the default values of LOWPC and HIGHPC from
7929 cu_bounds_kind = dwarf2_get_pc_bounds (comp_unit_die, &best_lowpc,
7930 &best_highpc, cu, pst);
7931 if (cu_bounds_kind == PC_BOUNDS_HIGH_LOW && best_lowpc < best_highpc)
7932 /* Store the contiguous range if it is not empty; it can be empty for
7933 CUs with no code. */
7934 addrmap_set_empty (objfile->psymtabs_addrmap,
7935 gdbarch_adjust_dwarf2_addr (gdbarch,
7936 best_lowpc + baseaddr),
7937 gdbarch_adjust_dwarf2_addr (gdbarch,
7938 best_highpc + baseaddr) - 1,
7941 /* Check if comp unit has_children.
7942 If so, read the rest of the partial symbols from this comp unit.
7943 If not, there's no more debug_info for this comp unit. */
7946 struct partial_die_info *first_die;
7947 CORE_ADDR lowpc, highpc;
7949 lowpc = ((CORE_ADDR) -1);
7950 highpc = ((CORE_ADDR) 0);
7952 first_die = load_partial_dies (reader, info_ptr, 1);
7954 scan_partial_symbols (first_die, &lowpc, &highpc,
7955 cu_bounds_kind <= PC_BOUNDS_INVALID, cu);
7957 /* If we didn't find a lowpc, set it to highpc to avoid
7958 complaints from `maint check'. */
7959 if (lowpc == ((CORE_ADDR) -1))
7962 /* If the compilation unit didn't have an explicit address range,
7963 then use the information extracted from its child dies. */
7964 if (cu_bounds_kind <= PC_BOUNDS_INVALID)
7967 best_highpc = highpc;
7970 pst->textlow = gdbarch_adjust_dwarf2_addr (gdbarch, best_lowpc + baseaddr);
7971 pst->texthigh = gdbarch_adjust_dwarf2_addr (gdbarch, best_highpc + baseaddr);
7973 end_psymtab_common (objfile, pst);
7975 if (!VEC_empty (dwarf2_per_cu_ptr, cu->per_cu->imported_symtabs))
7978 int len = VEC_length (dwarf2_per_cu_ptr, cu->per_cu->imported_symtabs);
7979 struct dwarf2_per_cu_data *iter;
7981 /* Fill in 'dependencies' here; we fill in 'users' in a
7983 pst->number_of_dependencies = len;
7985 XOBNEWVEC (&objfile->objfile_obstack, struct partial_symtab *, len);
7987 VEC_iterate (dwarf2_per_cu_ptr, cu->per_cu->imported_symtabs,
7990 pst->dependencies[i] = iter->v.psymtab;
7992 VEC_free (dwarf2_per_cu_ptr, cu->per_cu->imported_symtabs);
7995 /* Get the list of files included in the current compilation unit,
7996 and build a psymtab for each of them. */
7997 dwarf2_build_include_psymtabs (cu, comp_unit_die, pst);
7999 if (dwarf_read_debug)
8001 struct gdbarch *gdbarch = get_objfile_arch (objfile);
8003 fprintf_unfiltered (gdb_stdlog,
8004 "Psymtab for %s unit @%s: %s - %s"
8005 ", %d global, %d static syms\n",
8006 per_cu->is_debug_types ? "type" : "comp",
8007 sect_offset_str (per_cu->sect_off),
8008 paddress (gdbarch, pst->textlow),
8009 paddress (gdbarch, pst->texthigh),
8010 pst->n_global_syms, pst->n_static_syms);
8014 /* Subroutine of dwarf2_build_psymtabs_hard to simplify it.
8015 Process compilation unit THIS_CU for a psymtab. */
8018 process_psymtab_comp_unit (struct dwarf2_per_cu_data *this_cu,
8019 int want_partial_unit,
8020 enum language pretend_language)
8022 /* If this compilation unit was already read in, free the
8023 cached copy in order to read it in again. This is
8024 necessary because we skipped some symbols when we first
8025 read in the compilation unit (see load_partial_dies).
8026 This problem could be avoided, but the benefit is unclear. */
8027 if (this_cu->cu != NULL)
8028 free_one_cached_comp_unit (this_cu);
8030 if (this_cu->is_debug_types)
8031 init_cutu_and_read_dies (this_cu, NULL, 0, 0, false,
8032 build_type_psymtabs_reader, NULL);
8035 process_psymtab_comp_unit_data info;
8036 info.want_partial_unit = want_partial_unit;
8037 info.pretend_language = pretend_language;
8038 init_cutu_and_read_dies (this_cu, NULL, 0, 0, false,
8039 process_psymtab_comp_unit_reader, &info);
8042 /* Age out any secondary CUs. */
8043 age_cached_comp_units (this_cu->dwarf2_per_objfile);
8046 /* Reader function for build_type_psymtabs. */
8049 build_type_psymtabs_reader (const struct die_reader_specs *reader,
8050 const gdb_byte *info_ptr,
8051 struct die_info *type_unit_die,
8055 struct dwarf2_per_objfile *dwarf2_per_objfile
8056 = reader->cu->per_cu->dwarf2_per_objfile;
8057 struct objfile *objfile = dwarf2_per_objfile->objfile;
8058 struct dwarf2_cu *cu = reader->cu;
8059 struct dwarf2_per_cu_data *per_cu = cu->per_cu;
8060 struct signatured_type *sig_type;
8061 struct type_unit_group *tu_group;
8062 struct attribute *attr;
8063 struct partial_die_info *first_die;
8064 CORE_ADDR lowpc, highpc;
8065 struct partial_symtab *pst;
8067 gdb_assert (data == NULL);
8068 gdb_assert (per_cu->is_debug_types);
8069 sig_type = (struct signatured_type *) per_cu;
8074 attr = dwarf2_attr_no_follow (type_unit_die, DW_AT_stmt_list);
8075 tu_group = get_type_unit_group (cu, attr);
8077 VEC_safe_push (sig_type_ptr, tu_group->tus, sig_type);
8079 prepare_one_comp_unit (cu, type_unit_die, language_minimal);
8080 cu->list_in_scope = &file_symbols;
8081 pst = create_partial_symtab (per_cu, "");
8084 first_die = load_partial_dies (reader, info_ptr, 1);
8086 lowpc = (CORE_ADDR) -1;
8087 highpc = (CORE_ADDR) 0;
8088 scan_partial_symbols (first_die, &lowpc, &highpc, 0, cu);
8090 end_psymtab_common (objfile, pst);
8093 /* Struct used to sort TUs by their abbreviation table offset. */
8095 struct tu_abbrev_offset
8097 tu_abbrev_offset (signatured_type *sig_type_, sect_offset abbrev_offset_)
8098 : sig_type (sig_type_), abbrev_offset (abbrev_offset_)
8101 signatured_type *sig_type;
8102 sect_offset abbrev_offset;
8105 /* Helper routine for build_type_psymtabs_1, passed to std::sort. */
8108 sort_tu_by_abbrev_offset (const struct tu_abbrev_offset &a,
8109 const struct tu_abbrev_offset &b)
8111 return a.abbrev_offset < b.abbrev_offset;
8114 /* Efficiently read all the type units.
8115 This does the bulk of the work for build_type_psymtabs.
8117 The efficiency is because we sort TUs by the abbrev table they use and
8118 only read each abbrev table once. In one program there are 200K TUs
8119 sharing 8K abbrev tables.
8121 The main purpose of this function is to support building the
8122 dwarf2_per_objfile->type_unit_groups table.
8123 TUs typically share the DW_AT_stmt_list of the CU they came from, so we
8124 can collapse the search space by grouping them by stmt_list.
8125 The savings can be significant, in the same program from above the 200K TUs
8126 share 8K stmt_list tables.
8128 FUNC is expected to call get_type_unit_group, which will create the
8129 struct type_unit_group if necessary and add it to
8130 dwarf2_per_objfile->type_unit_groups. */
8133 build_type_psymtabs_1 (struct dwarf2_per_objfile *dwarf2_per_objfile)
8135 struct tu_stats *tu_stats = &dwarf2_per_objfile->tu_stats;
8136 abbrev_table_up abbrev_table;
8137 sect_offset abbrev_offset;
8139 /* It's up to the caller to not call us multiple times. */
8140 gdb_assert (dwarf2_per_objfile->type_unit_groups == NULL);
8142 if (dwarf2_per_objfile->all_type_units.empty ())
8145 /* TUs typically share abbrev tables, and there can be way more TUs than
8146 abbrev tables. Sort by abbrev table to reduce the number of times we
8147 read each abbrev table in.
8148 Alternatives are to punt or to maintain a cache of abbrev tables.
8149 This is simpler and efficient enough for now.
8151 Later we group TUs by their DW_AT_stmt_list value (as this defines the
8152 symtab to use). Typically TUs with the same abbrev offset have the same
8153 stmt_list value too so in practice this should work well.
8155 The basic algorithm here is:
8157 sort TUs by abbrev table
8158 for each TU with same abbrev table:
8159 read abbrev table if first user
8160 read TU top level DIE
8161 [IWBN if DWO skeletons had DW_AT_stmt_list]
8164 if (dwarf_read_debug)
8165 fprintf_unfiltered (gdb_stdlog, "Building type unit groups ...\n");
8167 /* Sort in a separate table to maintain the order of all_type_units
8168 for .gdb_index: TU indices directly index all_type_units. */
8169 std::vector<tu_abbrev_offset> sorted_by_abbrev;
8170 sorted_by_abbrev.reserve (dwarf2_per_objfile->all_type_units.size ());
8172 for (signatured_type *sig_type : dwarf2_per_objfile->all_type_units)
8173 sorted_by_abbrev.emplace_back
8174 (sig_type, read_abbrev_offset (dwarf2_per_objfile,
8175 sig_type->per_cu.section,
8176 sig_type->per_cu.sect_off));
8178 std::sort (sorted_by_abbrev.begin (), sorted_by_abbrev.end (),
8179 sort_tu_by_abbrev_offset);
8181 abbrev_offset = (sect_offset) ~(unsigned) 0;
8183 for (const tu_abbrev_offset &tu : sorted_by_abbrev)
8185 /* Switch to the next abbrev table if necessary. */
8186 if (abbrev_table == NULL
8187 || tu.abbrev_offset != abbrev_offset)
8189 abbrev_offset = tu.abbrev_offset;
8191 abbrev_table_read_table (dwarf2_per_objfile,
8192 &dwarf2_per_objfile->abbrev,
8194 ++tu_stats->nr_uniq_abbrev_tables;
8197 init_cutu_and_read_dies (&tu.sig_type->per_cu, abbrev_table.get (),
8198 0, 0, false, build_type_psymtabs_reader, NULL);
8202 /* Print collected type unit statistics. */
8205 print_tu_stats (struct dwarf2_per_objfile *dwarf2_per_objfile)
8207 struct tu_stats *tu_stats = &dwarf2_per_objfile->tu_stats;
8209 fprintf_unfiltered (gdb_stdlog, "Type unit statistics:\n");
8210 fprintf_unfiltered (gdb_stdlog, " %zu TUs\n",
8211 dwarf2_per_objfile->all_type_units.size ());
8212 fprintf_unfiltered (gdb_stdlog, " %d uniq abbrev tables\n",
8213 tu_stats->nr_uniq_abbrev_tables);
8214 fprintf_unfiltered (gdb_stdlog, " %d symtabs from stmt_list entries\n",
8215 tu_stats->nr_symtabs);
8216 fprintf_unfiltered (gdb_stdlog, " %d symtab sharers\n",
8217 tu_stats->nr_symtab_sharers);
8218 fprintf_unfiltered (gdb_stdlog, " %d type units without a stmt_list\n",
8219 tu_stats->nr_stmt_less_type_units);
8220 fprintf_unfiltered (gdb_stdlog, " %d all_type_units reallocs\n",
8221 tu_stats->nr_all_type_units_reallocs);
8224 /* Traversal function for build_type_psymtabs. */
8227 build_type_psymtab_dependencies (void **slot, void *info)
8229 struct dwarf2_per_objfile *dwarf2_per_objfile
8230 = (struct dwarf2_per_objfile *) info;
8231 struct objfile *objfile = dwarf2_per_objfile->objfile;
8232 struct type_unit_group *tu_group = (struct type_unit_group *) *slot;
8233 struct dwarf2_per_cu_data *per_cu = &tu_group->per_cu;
8234 struct partial_symtab *pst = per_cu->v.psymtab;
8235 int len = VEC_length (sig_type_ptr, tu_group->tus);
8236 struct signatured_type *iter;
8239 gdb_assert (len > 0);
8240 gdb_assert (IS_TYPE_UNIT_GROUP (per_cu));
8242 pst->number_of_dependencies = len;
8244 XOBNEWVEC (&objfile->objfile_obstack, struct partial_symtab *, len);
8246 VEC_iterate (sig_type_ptr, tu_group->tus, i, iter);
8249 gdb_assert (iter->per_cu.is_debug_types);
8250 pst->dependencies[i] = iter->per_cu.v.psymtab;
8251 iter->type_unit_group = tu_group;
8254 VEC_free (sig_type_ptr, tu_group->tus);
8259 /* Subroutine of dwarf2_build_psymtabs_hard to simplify it.
8260 Build partial symbol tables for the .debug_types comp-units. */
8263 build_type_psymtabs (struct dwarf2_per_objfile *dwarf2_per_objfile)
8265 if (! create_all_type_units (dwarf2_per_objfile))
8268 build_type_psymtabs_1 (dwarf2_per_objfile);
8271 /* Traversal function for process_skeletonless_type_unit.
8272 Read a TU in a DWO file and build partial symbols for it. */
8275 process_skeletonless_type_unit (void **slot, void *info)
8277 struct dwo_unit *dwo_unit = (struct dwo_unit *) *slot;
8278 struct dwarf2_per_objfile *dwarf2_per_objfile
8279 = (struct dwarf2_per_objfile *) info;
8280 struct signatured_type find_entry, *entry;
8282 /* If this TU doesn't exist in the global table, add it and read it in. */
8284 if (dwarf2_per_objfile->signatured_types == NULL)
8286 dwarf2_per_objfile->signatured_types
8287 = allocate_signatured_type_table (dwarf2_per_objfile->objfile);
8290 find_entry.signature = dwo_unit->signature;
8291 slot = htab_find_slot (dwarf2_per_objfile->signatured_types, &find_entry,
8293 /* If we've already seen this type there's nothing to do. What's happening
8294 is we're doing our own version of comdat-folding here. */
8298 /* This does the job that create_all_type_units would have done for
8300 entry = add_type_unit (dwarf2_per_objfile, dwo_unit->signature, slot);
8301 fill_in_sig_entry_from_dwo_entry (dwarf2_per_objfile, entry, dwo_unit);
8304 /* This does the job that build_type_psymtabs_1 would have done. */
8305 init_cutu_and_read_dies (&entry->per_cu, NULL, 0, 0, false,
8306 build_type_psymtabs_reader, NULL);
8311 /* Traversal function for process_skeletonless_type_units. */
8314 process_dwo_file_for_skeletonless_type_units (void **slot, void *info)
8316 struct dwo_file *dwo_file = (struct dwo_file *) *slot;
8318 if (dwo_file->tus != NULL)
8320 htab_traverse_noresize (dwo_file->tus,
8321 process_skeletonless_type_unit, info);
8327 /* Scan all TUs of DWO files, verifying we've processed them.
8328 This is needed in case a TU was emitted without its skeleton.
8329 Note: This can't be done until we know what all the DWO files are. */
8332 process_skeletonless_type_units (struct dwarf2_per_objfile *dwarf2_per_objfile)
8334 /* Skeletonless TUs in DWP files without .gdb_index is not supported yet. */
8335 if (get_dwp_file (dwarf2_per_objfile) == NULL
8336 && dwarf2_per_objfile->dwo_files != NULL)
8338 htab_traverse_noresize (dwarf2_per_objfile->dwo_files,
8339 process_dwo_file_for_skeletonless_type_units,
8340 dwarf2_per_objfile);
8344 /* Compute the 'user' field for each psymtab in DWARF2_PER_OBJFILE. */
8347 set_partial_user (struct dwarf2_per_objfile *dwarf2_per_objfile)
8349 for (dwarf2_per_cu_data *per_cu : dwarf2_per_objfile->all_comp_units)
8351 struct partial_symtab *pst = per_cu->v.psymtab;
8356 for (int j = 0; j < pst->number_of_dependencies; ++j)
8358 /* Set the 'user' field only if it is not already set. */
8359 if (pst->dependencies[j]->user == NULL)
8360 pst->dependencies[j]->user = pst;
8365 /* Build the partial symbol table by doing a quick pass through the
8366 .debug_info and .debug_abbrev sections. */
8369 dwarf2_build_psymtabs_hard (struct dwarf2_per_objfile *dwarf2_per_objfile)
8371 struct objfile *objfile = dwarf2_per_objfile->objfile;
8373 if (dwarf_read_debug)
8375 fprintf_unfiltered (gdb_stdlog, "Building psymtabs of objfile %s ...\n",
8376 objfile_name (objfile));
8379 dwarf2_per_objfile->reading_partial_symbols = 1;
8381 dwarf2_read_section (objfile, &dwarf2_per_objfile->info);
8383 /* Any cached compilation units will be linked by the per-objfile
8384 read_in_chain. Make sure to free them when we're done. */
8385 free_cached_comp_units freer (dwarf2_per_objfile);
8387 build_type_psymtabs (dwarf2_per_objfile);
8389 create_all_comp_units (dwarf2_per_objfile);
8391 /* Create a temporary address map on a temporary obstack. We later
8392 copy this to the final obstack. */
8393 auto_obstack temp_obstack;
8395 scoped_restore save_psymtabs_addrmap
8396 = make_scoped_restore (&objfile->psymtabs_addrmap,
8397 addrmap_create_mutable (&temp_obstack));
8399 for (dwarf2_per_cu_data *per_cu : dwarf2_per_objfile->all_comp_units)
8400 process_psymtab_comp_unit (per_cu, 0, language_minimal);
8402 /* This has to wait until we read the CUs, we need the list of DWOs. */
8403 process_skeletonless_type_units (dwarf2_per_objfile);
8405 /* Now that all TUs have been processed we can fill in the dependencies. */
8406 if (dwarf2_per_objfile->type_unit_groups != NULL)
8408 htab_traverse_noresize (dwarf2_per_objfile->type_unit_groups,
8409 build_type_psymtab_dependencies, dwarf2_per_objfile);
8412 if (dwarf_read_debug)
8413 print_tu_stats (dwarf2_per_objfile);
8415 set_partial_user (dwarf2_per_objfile);
8417 objfile->psymtabs_addrmap = addrmap_create_fixed (objfile->psymtabs_addrmap,
8418 &objfile->objfile_obstack);
8419 /* At this point we want to keep the address map. */
8420 save_psymtabs_addrmap.release ();
8422 if (dwarf_read_debug)
8423 fprintf_unfiltered (gdb_stdlog, "Done building psymtabs of %s\n",
8424 objfile_name (objfile));
8427 /* die_reader_func for load_partial_comp_unit. */
8430 load_partial_comp_unit_reader (const struct die_reader_specs *reader,
8431 const gdb_byte *info_ptr,
8432 struct die_info *comp_unit_die,
8436 struct dwarf2_cu *cu = reader->cu;
8438 prepare_one_comp_unit (cu, comp_unit_die, language_minimal);
8440 /* Check if comp unit has_children.
8441 If so, read the rest of the partial symbols from this comp unit.
8442 If not, there's no more debug_info for this comp unit. */
8444 load_partial_dies (reader, info_ptr, 0);
8447 /* Load the partial DIEs for a secondary CU into memory.
8448 This is also used when rereading a primary CU with load_all_dies. */
8451 load_partial_comp_unit (struct dwarf2_per_cu_data *this_cu)
8453 init_cutu_and_read_dies (this_cu, NULL, 1, 1, false,
8454 load_partial_comp_unit_reader, NULL);
8458 read_comp_units_from_section (struct dwarf2_per_objfile *dwarf2_per_objfile,
8459 struct dwarf2_section_info *section,
8460 struct dwarf2_section_info *abbrev_section,
8461 unsigned int is_dwz)
8463 const gdb_byte *info_ptr;
8464 struct objfile *objfile = dwarf2_per_objfile->objfile;
8466 if (dwarf_read_debug)
8467 fprintf_unfiltered (gdb_stdlog, "Reading %s for %s\n",
8468 get_section_name (section),
8469 get_section_file_name (section));
8471 dwarf2_read_section (objfile, section);
8473 info_ptr = section->buffer;
8475 while (info_ptr < section->buffer + section->size)
8477 struct dwarf2_per_cu_data *this_cu;
8479 sect_offset sect_off = (sect_offset) (info_ptr - section->buffer);
8481 comp_unit_head cu_header;
8482 read_and_check_comp_unit_head (dwarf2_per_objfile, &cu_header, section,
8483 abbrev_section, info_ptr,
8484 rcuh_kind::COMPILE);
8486 /* Save the compilation unit for later lookup. */
8487 if (cu_header.unit_type != DW_UT_type)
8489 this_cu = XOBNEW (&objfile->objfile_obstack,
8490 struct dwarf2_per_cu_data);
8491 memset (this_cu, 0, sizeof (*this_cu));
8495 auto sig_type = XOBNEW (&objfile->objfile_obstack,
8496 struct signatured_type);
8497 memset (sig_type, 0, sizeof (*sig_type));
8498 sig_type->signature = cu_header.signature;
8499 sig_type->type_offset_in_tu = cu_header.type_cu_offset_in_tu;
8500 this_cu = &sig_type->per_cu;
8502 this_cu->is_debug_types = (cu_header.unit_type == DW_UT_type);
8503 this_cu->sect_off = sect_off;
8504 this_cu->length = cu_header.length + cu_header.initial_length_size;
8505 this_cu->is_dwz = is_dwz;
8506 this_cu->dwarf2_per_objfile = dwarf2_per_objfile;
8507 this_cu->section = section;
8509 dwarf2_per_objfile->all_comp_units.push_back (this_cu);
8511 info_ptr = info_ptr + this_cu->length;
8515 /* Create a list of all compilation units in OBJFILE.
8516 This is only done for -readnow and building partial symtabs. */
8519 create_all_comp_units (struct dwarf2_per_objfile *dwarf2_per_objfile)
8521 gdb_assert (dwarf2_per_objfile->all_comp_units.empty ());
8522 read_comp_units_from_section (dwarf2_per_objfile, &dwarf2_per_objfile->info,
8523 &dwarf2_per_objfile->abbrev, 0);
8525 dwz_file *dwz = dwarf2_get_dwz_file (dwarf2_per_objfile);
8527 read_comp_units_from_section (dwarf2_per_objfile, &dwz->info, &dwz->abbrev,
8531 /* Process all loaded DIEs for compilation unit CU, starting at
8532 FIRST_DIE. The caller should pass SET_ADDRMAP == 1 if the compilation
8533 unit DIE did not have PC info (DW_AT_low_pc and DW_AT_high_pc, or
8534 DW_AT_ranges). See the comments of add_partial_subprogram on how
8535 SET_ADDRMAP is used and how *LOWPC and *HIGHPC are updated. */
8538 scan_partial_symbols (struct partial_die_info *first_die, CORE_ADDR *lowpc,
8539 CORE_ADDR *highpc, int set_addrmap,
8540 struct dwarf2_cu *cu)
8542 struct partial_die_info *pdi;
8544 /* Now, march along the PDI's, descending into ones which have
8545 interesting children but skipping the children of the other ones,
8546 until we reach the end of the compilation unit. */
8554 /* Anonymous namespaces or modules have no name but have interesting
8555 children, so we need to look at them. Ditto for anonymous
8558 if (pdi->name != NULL || pdi->tag == DW_TAG_namespace
8559 || pdi->tag == DW_TAG_module || pdi->tag == DW_TAG_enumeration_type
8560 || pdi->tag == DW_TAG_imported_unit
8561 || pdi->tag == DW_TAG_inlined_subroutine)
8565 case DW_TAG_subprogram:
8566 case DW_TAG_inlined_subroutine:
8567 add_partial_subprogram (pdi, lowpc, highpc, set_addrmap, cu);
8569 case DW_TAG_constant:
8570 case DW_TAG_variable:
8571 case DW_TAG_typedef:
8572 case DW_TAG_union_type:
8573 if (!pdi->is_declaration)
8575 add_partial_symbol (pdi, cu);
8578 case DW_TAG_class_type:
8579 case DW_TAG_interface_type:
8580 case DW_TAG_structure_type:
8581 if (!pdi->is_declaration)
8583 add_partial_symbol (pdi, cu);
8585 if ((cu->language == language_rust
8586 || cu->language == language_cplus) && pdi->has_children)
8587 scan_partial_symbols (pdi->die_child, lowpc, highpc,
8590 case DW_TAG_enumeration_type:
8591 if (!pdi->is_declaration)
8592 add_partial_enumeration (pdi, cu);
8594 case DW_TAG_base_type:
8595 case DW_TAG_subrange_type:
8596 /* File scope base type definitions are added to the partial
8598 add_partial_symbol (pdi, cu);
8600 case DW_TAG_namespace:
8601 add_partial_namespace (pdi, lowpc, highpc, set_addrmap, cu);
8604 add_partial_module (pdi, lowpc, highpc, set_addrmap, cu);
8606 case DW_TAG_imported_unit:
8608 struct dwarf2_per_cu_data *per_cu;
8610 /* For now we don't handle imported units in type units. */
8611 if (cu->per_cu->is_debug_types)
8613 error (_("Dwarf Error: DW_TAG_imported_unit is not"
8614 " supported in type units [in module %s]"),
8615 objfile_name (cu->per_cu->dwarf2_per_objfile->objfile));
8618 per_cu = dwarf2_find_containing_comp_unit
8619 (pdi->d.sect_off, pdi->is_dwz,
8620 cu->per_cu->dwarf2_per_objfile);
8622 /* Go read the partial unit, if needed. */
8623 if (per_cu->v.psymtab == NULL)
8624 process_psymtab_comp_unit (per_cu, 1, cu->language);
8626 VEC_safe_push (dwarf2_per_cu_ptr,
8627 cu->per_cu->imported_symtabs, per_cu);
8630 case DW_TAG_imported_declaration:
8631 add_partial_symbol (pdi, cu);
8638 /* If the die has a sibling, skip to the sibling. */
8640 pdi = pdi->die_sibling;
8644 /* Functions used to compute the fully scoped name of a partial DIE.
8646 Normally, this is simple. For C++, the parent DIE's fully scoped
8647 name is concatenated with "::" and the partial DIE's name.
8648 Enumerators are an exception; they use the scope of their parent
8649 enumeration type, i.e. the name of the enumeration type is not
8650 prepended to the enumerator.
8652 There are two complexities. One is DW_AT_specification; in this
8653 case "parent" means the parent of the target of the specification,
8654 instead of the direct parent of the DIE. The other is compilers
8655 which do not emit DW_TAG_namespace; in this case we try to guess
8656 the fully qualified name of structure types from their members'
8657 linkage names. This must be done using the DIE's children rather
8658 than the children of any DW_AT_specification target. We only need
8659 to do this for structures at the top level, i.e. if the target of
8660 any DW_AT_specification (if any; otherwise the DIE itself) does not
8663 /* Compute the scope prefix associated with PDI's parent, in
8664 compilation unit CU. The result will be allocated on CU's
8665 comp_unit_obstack, or a copy of the already allocated PDI->NAME
8666 field. NULL is returned if no prefix is necessary. */
8668 partial_die_parent_scope (struct partial_die_info *pdi,
8669 struct dwarf2_cu *cu)
8671 const char *grandparent_scope;
8672 struct partial_die_info *parent, *real_pdi;
8674 /* We need to look at our parent DIE; if we have a DW_AT_specification,
8675 then this means the parent of the specification DIE. */
8678 while (real_pdi->has_specification)
8679 real_pdi = find_partial_die (real_pdi->spec_offset,
8680 real_pdi->spec_is_dwz, cu);
8682 parent = real_pdi->die_parent;
8686 if (parent->scope_set)
8687 return parent->scope;
8691 grandparent_scope = partial_die_parent_scope (parent, cu);
8693 /* GCC 4.0 and 4.1 had a bug (PR c++/28460) where they generated bogus
8694 DW_TAG_namespace DIEs with a name of "::" for the global namespace.
8695 Work around this problem here. */
8696 if (cu->language == language_cplus
8697 && parent->tag == DW_TAG_namespace
8698 && strcmp (parent->name, "::") == 0
8699 && grandparent_scope == NULL)
8701 parent->scope = NULL;
8702 parent->scope_set = 1;
8706 if (pdi->tag == DW_TAG_enumerator)
8707 /* Enumerators should not get the name of the enumeration as a prefix. */
8708 parent->scope = grandparent_scope;
8709 else if (parent->tag == DW_TAG_namespace
8710 || parent->tag == DW_TAG_module
8711 || parent->tag == DW_TAG_structure_type
8712 || parent->tag == DW_TAG_class_type
8713 || parent->tag == DW_TAG_interface_type
8714 || parent->tag == DW_TAG_union_type
8715 || parent->tag == DW_TAG_enumeration_type)
8717 if (grandparent_scope == NULL)
8718 parent->scope = parent->name;
8720 parent->scope = typename_concat (&cu->comp_unit_obstack,
8722 parent->name, 0, cu);
8726 /* FIXME drow/2004-04-01: What should we be doing with
8727 function-local names? For partial symbols, we should probably be
8729 complaint (_("unhandled containing DIE tag %d for DIE at %s"),
8730 parent->tag, sect_offset_str (pdi->sect_off));
8731 parent->scope = grandparent_scope;
8734 parent->scope_set = 1;
8735 return parent->scope;
8738 /* Return the fully scoped name associated with PDI, from compilation unit
8739 CU. The result will be allocated with malloc. */
8742 partial_die_full_name (struct partial_die_info *pdi,
8743 struct dwarf2_cu *cu)
8745 const char *parent_scope;
8747 /* If this is a template instantiation, we can not work out the
8748 template arguments from partial DIEs. So, unfortunately, we have
8749 to go through the full DIEs. At least any work we do building
8750 types here will be reused if full symbols are loaded later. */
8751 if (pdi->has_template_arguments)
8755 if (pdi->name != NULL && strchr (pdi->name, '<') == NULL)
8757 struct die_info *die;
8758 struct attribute attr;
8759 struct dwarf2_cu *ref_cu = cu;
8761 /* DW_FORM_ref_addr is using section offset. */
8762 attr.name = (enum dwarf_attribute) 0;
8763 attr.form = DW_FORM_ref_addr;
8764 attr.u.unsnd = to_underlying (pdi->sect_off);
8765 die = follow_die_ref (NULL, &attr, &ref_cu);
8767 return xstrdup (dwarf2_full_name (NULL, die, ref_cu));
8771 parent_scope = partial_die_parent_scope (pdi, cu);
8772 if (parent_scope == NULL)
8775 return typename_concat (NULL, parent_scope, pdi->name, 0, cu);
8779 add_partial_symbol (struct partial_die_info *pdi, struct dwarf2_cu *cu)
8781 struct dwarf2_per_objfile *dwarf2_per_objfile
8782 = cu->per_cu->dwarf2_per_objfile;
8783 struct objfile *objfile = dwarf2_per_objfile->objfile;
8784 struct gdbarch *gdbarch = get_objfile_arch (objfile);
8786 const char *actual_name = NULL;
8788 char *built_actual_name;
8790 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
8792 built_actual_name = partial_die_full_name (pdi, cu);
8793 if (built_actual_name != NULL)
8794 actual_name = built_actual_name;
8796 if (actual_name == NULL)
8797 actual_name = pdi->name;
8801 case DW_TAG_inlined_subroutine:
8802 case DW_TAG_subprogram:
8803 addr = gdbarch_adjust_dwarf2_addr (gdbarch, pdi->lowpc + baseaddr);
8804 if (pdi->is_external || cu->language == language_ada)
8806 /* brobecker/2007-12-26: Normally, only "external" DIEs are part
8807 of the global scope. But in Ada, we want to be able to access
8808 nested procedures globally. So all Ada subprograms are stored
8809 in the global scope. */
8810 add_psymbol_to_list (actual_name, strlen (actual_name),
8811 built_actual_name != NULL,
8812 VAR_DOMAIN, LOC_BLOCK,
8813 &objfile->global_psymbols,
8814 addr, cu->language, objfile);
8818 add_psymbol_to_list (actual_name, strlen (actual_name),
8819 built_actual_name != NULL,
8820 VAR_DOMAIN, LOC_BLOCK,
8821 &objfile->static_psymbols,
8822 addr, cu->language, objfile);
8825 if (pdi->main_subprogram && actual_name != NULL)
8826 set_objfile_main_name (objfile, actual_name, cu->language);
8828 case DW_TAG_constant:
8830 std::vector<partial_symbol *> *list;
8832 if (pdi->is_external)
8833 list = &objfile->global_psymbols;
8835 list = &objfile->static_psymbols;
8836 add_psymbol_to_list (actual_name, strlen (actual_name),
8837 built_actual_name != NULL, VAR_DOMAIN, LOC_STATIC,
8838 list, 0, cu->language, objfile);
8841 case DW_TAG_variable:
8843 addr = decode_locdesc (pdi->d.locdesc, cu);
8847 && !dwarf2_per_objfile->has_section_at_zero)
8849 /* A global or static variable may also have been stripped
8850 out by the linker if unused, in which case its address
8851 will be nullified; do not add such variables into partial
8852 symbol table then. */
8854 else if (pdi->is_external)
8857 Don't enter into the minimal symbol tables as there is
8858 a minimal symbol table entry from the ELF symbols already.
8859 Enter into partial symbol table if it has a location
8860 descriptor or a type.
8861 If the location descriptor is missing, new_symbol will create
8862 a LOC_UNRESOLVED symbol, the address of the variable will then
8863 be determined from the minimal symbol table whenever the variable
8865 The address for the partial symbol table entry is not
8866 used by GDB, but it comes in handy for debugging partial symbol
8869 if (pdi->d.locdesc || pdi->has_type)
8870 add_psymbol_to_list (actual_name, strlen (actual_name),
8871 built_actual_name != NULL,
8872 VAR_DOMAIN, LOC_STATIC,
8873 &objfile->global_psymbols,
8875 cu->language, objfile);
8879 int has_loc = pdi->d.locdesc != NULL;
8881 /* Static Variable. Skip symbols whose value we cannot know (those
8882 without location descriptors or constant values). */
8883 if (!has_loc && !pdi->has_const_value)
8885 xfree (built_actual_name);
8889 add_psymbol_to_list (actual_name, strlen (actual_name),
8890 built_actual_name != NULL,
8891 VAR_DOMAIN, LOC_STATIC,
8892 &objfile->static_psymbols,
8893 has_loc ? addr + baseaddr : (CORE_ADDR) 0,
8894 cu->language, objfile);
8897 case DW_TAG_typedef:
8898 case DW_TAG_base_type:
8899 case DW_TAG_subrange_type:
8900 add_psymbol_to_list (actual_name, strlen (actual_name),
8901 built_actual_name != NULL,
8902 VAR_DOMAIN, LOC_TYPEDEF,
8903 &objfile->static_psymbols,
8904 0, cu->language, objfile);
8906 case DW_TAG_imported_declaration:
8907 case DW_TAG_namespace:
8908 add_psymbol_to_list (actual_name, strlen (actual_name),
8909 built_actual_name != NULL,
8910 VAR_DOMAIN, LOC_TYPEDEF,
8911 &objfile->global_psymbols,
8912 0, cu->language, objfile);
8915 add_psymbol_to_list (actual_name, strlen (actual_name),
8916 built_actual_name != NULL,
8917 MODULE_DOMAIN, LOC_TYPEDEF,
8918 &objfile->global_psymbols,
8919 0, cu->language, objfile);
8921 case DW_TAG_class_type:
8922 case DW_TAG_interface_type:
8923 case DW_TAG_structure_type:
8924 case DW_TAG_union_type:
8925 case DW_TAG_enumeration_type:
8926 /* Skip external references. The DWARF standard says in the section
8927 about "Structure, Union, and Class Type Entries": "An incomplete
8928 structure, union or class type is represented by a structure,
8929 union or class entry that does not have a byte size attribute
8930 and that has a DW_AT_declaration attribute." */
8931 if (!pdi->has_byte_size && pdi->is_declaration)
8933 xfree (built_actual_name);
8937 /* NOTE: carlton/2003-10-07: See comment in new_symbol about
8938 static vs. global. */
8939 add_psymbol_to_list (actual_name, strlen (actual_name),
8940 built_actual_name != NULL,
8941 STRUCT_DOMAIN, LOC_TYPEDEF,
8942 cu->language == language_cplus
8943 ? &objfile->global_psymbols
8944 : &objfile->static_psymbols,
8945 0, cu->language, objfile);
8948 case DW_TAG_enumerator:
8949 add_psymbol_to_list (actual_name, strlen (actual_name),
8950 built_actual_name != NULL,
8951 VAR_DOMAIN, LOC_CONST,
8952 cu->language == language_cplus
8953 ? &objfile->global_psymbols
8954 : &objfile->static_psymbols,
8955 0, cu->language, objfile);
8961 xfree (built_actual_name);
8964 /* Read a partial die corresponding to a namespace; also, add a symbol
8965 corresponding to that namespace to the symbol table. NAMESPACE is
8966 the name of the enclosing namespace. */
8969 add_partial_namespace (struct partial_die_info *pdi,
8970 CORE_ADDR *lowpc, CORE_ADDR *highpc,
8971 int set_addrmap, struct dwarf2_cu *cu)
8973 /* Add a symbol for the namespace. */
8975 add_partial_symbol (pdi, cu);
8977 /* Now scan partial symbols in that namespace. */
8979 if (pdi->has_children)
8980 scan_partial_symbols (pdi->die_child, lowpc, highpc, set_addrmap, cu);
8983 /* Read a partial die corresponding to a Fortran module. */
8986 add_partial_module (struct partial_die_info *pdi, CORE_ADDR *lowpc,
8987 CORE_ADDR *highpc, int set_addrmap, struct dwarf2_cu *cu)
8989 /* Add a symbol for the namespace. */
8991 add_partial_symbol (pdi, cu);
8993 /* Now scan partial symbols in that module. */
8995 if (pdi->has_children)
8996 scan_partial_symbols (pdi->die_child, lowpc, highpc, set_addrmap, cu);
8999 /* Read a partial die corresponding to a subprogram or an inlined
9000 subprogram and create a partial symbol for that subprogram.
9001 When the CU language allows it, this routine also defines a partial
9002 symbol for each nested subprogram that this subprogram contains.
9003 If SET_ADDRMAP is true, record the covered ranges in the addrmap.
9004 Set *LOWPC and *HIGHPC to the lowest and highest PC values found in PDI.
9006 PDI may also be a lexical block, in which case we simply search
9007 recursively for subprograms defined inside that lexical block.
9008 Again, this is only performed when the CU language allows this
9009 type of definitions. */
9012 add_partial_subprogram (struct partial_die_info *pdi,
9013 CORE_ADDR *lowpc, CORE_ADDR *highpc,
9014 int set_addrmap, struct dwarf2_cu *cu)
9016 if (pdi->tag == DW_TAG_subprogram || pdi->tag == DW_TAG_inlined_subroutine)
9018 if (pdi->has_pc_info)
9020 if (pdi->lowpc < *lowpc)
9021 *lowpc = pdi->lowpc;
9022 if (pdi->highpc > *highpc)
9023 *highpc = pdi->highpc;
9026 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
9027 struct gdbarch *gdbarch = get_objfile_arch (objfile);
9032 baseaddr = ANOFFSET (objfile->section_offsets,
9033 SECT_OFF_TEXT (objfile));
9034 lowpc = gdbarch_adjust_dwarf2_addr (gdbarch,
9035 pdi->lowpc + baseaddr);
9036 highpc = gdbarch_adjust_dwarf2_addr (gdbarch,
9037 pdi->highpc + baseaddr);
9038 addrmap_set_empty (objfile->psymtabs_addrmap, lowpc, highpc - 1,
9039 cu->per_cu->v.psymtab);
9043 if (pdi->has_pc_info || (!pdi->is_external && pdi->may_be_inlined))
9045 if (!pdi->is_declaration)
9046 /* Ignore subprogram DIEs that do not have a name, they are
9047 illegal. Do not emit a complaint at this point, we will
9048 do so when we convert this psymtab into a symtab. */
9050 add_partial_symbol (pdi, cu);
9054 if (! pdi->has_children)
9057 if (cu->language == language_ada)
9059 pdi = pdi->die_child;
9063 if (pdi->tag == DW_TAG_subprogram
9064 || pdi->tag == DW_TAG_inlined_subroutine
9065 || pdi->tag == DW_TAG_lexical_block)
9066 add_partial_subprogram (pdi, lowpc, highpc, set_addrmap, cu);
9067 pdi = pdi->die_sibling;
9072 /* Read a partial die corresponding to an enumeration type. */
9075 add_partial_enumeration (struct partial_die_info *enum_pdi,
9076 struct dwarf2_cu *cu)
9078 struct partial_die_info *pdi;
9080 if (enum_pdi->name != NULL)
9081 add_partial_symbol (enum_pdi, cu);
9083 pdi = enum_pdi->die_child;
9086 if (pdi->tag != DW_TAG_enumerator || pdi->name == NULL)
9087 complaint (_("malformed enumerator DIE ignored"));
9089 add_partial_symbol (pdi, cu);
9090 pdi = pdi->die_sibling;
9094 /* Return the initial uleb128 in the die at INFO_PTR. */
9097 peek_abbrev_code (bfd *abfd, const gdb_byte *info_ptr)
9099 unsigned int bytes_read;
9101 return read_unsigned_leb128 (abfd, info_ptr, &bytes_read);
9104 /* Read the initial uleb128 in the die at INFO_PTR in compilation unit
9105 READER::CU. Use READER::ABBREV_TABLE to lookup any abbreviation.
9107 Return the corresponding abbrev, or NULL if the number is zero (indicating
9108 an empty DIE). In either case *BYTES_READ will be set to the length of
9109 the initial number. */
9111 static struct abbrev_info *
9112 peek_die_abbrev (const die_reader_specs &reader,
9113 const gdb_byte *info_ptr, unsigned int *bytes_read)
9115 dwarf2_cu *cu = reader.cu;
9116 bfd *abfd = cu->per_cu->dwarf2_per_objfile->objfile->obfd;
9117 unsigned int abbrev_number
9118 = read_unsigned_leb128 (abfd, info_ptr, bytes_read);
9120 if (abbrev_number == 0)
9123 abbrev_info *abbrev = reader.abbrev_table->lookup_abbrev (abbrev_number);
9126 error (_("Dwarf Error: Could not find abbrev number %d in %s"
9127 " at offset %s [in module %s]"),
9128 abbrev_number, cu->per_cu->is_debug_types ? "TU" : "CU",
9129 sect_offset_str (cu->header.sect_off), bfd_get_filename (abfd));
9135 /* Scan the debug information for CU starting at INFO_PTR in buffer BUFFER.
9136 Returns a pointer to the end of a series of DIEs, terminated by an empty
9137 DIE. Any children of the skipped DIEs will also be skipped. */
9139 static const gdb_byte *
9140 skip_children (const struct die_reader_specs *reader, const gdb_byte *info_ptr)
9144 unsigned int bytes_read;
9145 abbrev_info *abbrev = peek_die_abbrev (*reader, info_ptr, &bytes_read);
9148 return info_ptr + bytes_read;
9150 info_ptr = skip_one_die (reader, info_ptr + bytes_read, abbrev);
9154 /* Scan the debug information for CU starting at INFO_PTR in buffer BUFFER.
9155 INFO_PTR should point just after the initial uleb128 of a DIE, and the
9156 abbrev corresponding to that skipped uleb128 should be passed in
9157 ABBREV. Returns a pointer to this DIE's sibling, skipping any
9160 static const gdb_byte *
9161 skip_one_die (const struct die_reader_specs *reader, const gdb_byte *info_ptr,
9162 struct abbrev_info *abbrev)
9164 unsigned int bytes_read;
9165 struct attribute attr;
9166 bfd *abfd = reader->abfd;
9167 struct dwarf2_cu *cu = reader->cu;
9168 const gdb_byte *buffer = reader->buffer;
9169 const gdb_byte *buffer_end = reader->buffer_end;
9170 unsigned int form, i;
9172 for (i = 0; i < abbrev->num_attrs; i++)
9174 /* The only abbrev we care about is DW_AT_sibling. */
9175 if (abbrev->attrs[i].name == DW_AT_sibling)
9177 read_attribute (reader, &attr, &abbrev->attrs[i], info_ptr);
9178 if (attr.form == DW_FORM_ref_addr)
9179 complaint (_("ignoring absolute DW_AT_sibling"));
9182 sect_offset off = dwarf2_get_ref_die_offset (&attr);
9183 const gdb_byte *sibling_ptr = buffer + to_underlying (off);
9185 if (sibling_ptr < info_ptr)
9186 complaint (_("DW_AT_sibling points backwards"));
9187 else if (sibling_ptr > reader->buffer_end)
9188 dwarf2_section_buffer_overflow_complaint (reader->die_section);
9194 /* If it isn't DW_AT_sibling, skip this attribute. */
9195 form = abbrev->attrs[i].form;
9199 case DW_FORM_ref_addr:
9200 /* In DWARF 2, DW_FORM_ref_addr is address sized; in DWARF 3
9201 and later it is offset sized. */
9202 if (cu->header.version == 2)
9203 info_ptr += cu->header.addr_size;
9205 info_ptr += cu->header.offset_size;
9207 case DW_FORM_GNU_ref_alt:
9208 info_ptr += cu->header.offset_size;
9211 info_ptr += cu->header.addr_size;
9218 case DW_FORM_flag_present:
9219 case DW_FORM_implicit_const:
9231 case DW_FORM_ref_sig8:
9234 case DW_FORM_data16:
9237 case DW_FORM_string:
9238 read_direct_string (abfd, info_ptr, &bytes_read);
9239 info_ptr += bytes_read;
9241 case DW_FORM_sec_offset:
9243 case DW_FORM_GNU_strp_alt:
9244 info_ptr += cu->header.offset_size;
9246 case DW_FORM_exprloc:
9248 info_ptr += read_unsigned_leb128 (abfd, info_ptr, &bytes_read);
9249 info_ptr += bytes_read;
9251 case DW_FORM_block1:
9252 info_ptr += 1 + read_1_byte (abfd, info_ptr);
9254 case DW_FORM_block2:
9255 info_ptr += 2 + read_2_bytes (abfd, info_ptr);
9257 case DW_FORM_block4:
9258 info_ptr += 4 + read_4_bytes (abfd, info_ptr);
9262 case DW_FORM_ref_udata:
9263 case DW_FORM_GNU_addr_index:
9264 case DW_FORM_GNU_str_index:
9265 info_ptr = safe_skip_leb128 (info_ptr, buffer_end);
9267 case DW_FORM_indirect:
9268 form = read_unsigned_leb128 (abfd, info_ptr, &bytes_read);
9269 info_ptr += bytes_read;
9270 /* We need to continue parsing from here, so just go back to
9272 goto skip_attribute;
9275 error (_("Dwarf Error: Cannot handle %s "
9276 "in DWARF reader [in module %s]"),
9277 dwarf_form_name (form),
9278 bfd_get_filename (abfd));
9282 if (abbrev->has_children)
9283 return skip_children (reader, info_ptr);
9288 /* Locate ORIG_PDI's sibling.
9289 INFO_PTR should point to the start of the next DIE after ORIG_PDI. */
9291 static const gdb_byte *
9292 locate_pdi_sibling (const struct die_reader_specs *reader,
9293 struct partial_die_info *orig_pdi,
9294 const gdb_byte *info_ptr)
9296 /* Do we know the sibling already? */
9298 if (orig_pdi->sibling)
9299 return orig_pdi->sibling;
9301 /* Are there any children to deal with? */
9303 if (!orig_pdi->has_children)
9306 /* Skip the children the long way. */
9308 return skip_children (reader, info_ptr);
9311 /* Expand this partial symbol table into a full symbol table. SELF is
9315 dwarf2_read_symtab (struct partial_symtab *self,
9316 struct objfile *objfile)
9318 struct dwarf2_per_objfile *dwarf2_per_objfile
9319 = get_dwarf2_per_objfile (objfile);
9323 warning (_("bug: psymtab for %s is already read in."),
9330 printf_filtered (_("Reading in symbols for %s..."),
9332 gdb_flush (gdb_stdout);
9335 /* If this psymtab is constructed from a debug-only objfile, the
9336 has_section_at_zero flag will not necessarily be correct. We
9337 can get the correct value for this flag by looking at the data
9338 associated with the (presumably stripped) associated objfile. */
9339 if (objfile->separate_debug_objfile_backlink)
9341 struct dwarf2_per_objfile *dpo_backlink
9342 = get_dwarf2_per_objfile (objfile->separate_debug_objfile_backlink);
9344 dwarf2_per_objfile->has_section_at_zero
9345 = dpo_backlink->has_section_at_zero;
9348 dwarf2_per_objfile->reading_partial_symbols = 0;
9350 psymtab_to_symtab_1 (self);
9352 /* Finish up the debug error message. */
9354 printf_filtered (_("done.\n"));
9357 process_cu_includes (dwarf2_per_objfile);
9360 /* Reading in full CUs. */
9362 /* Add PER_CU to the queue. */
9365 queue_comp_unit (struct dwarf2_per_cu_data *per_cu,
9366 enum language pretend_language)
9368 struct dwarf2_queue_item *item;
9371 item = XNEW (struct dwarf2_queue_item);
9372 item->per_cu = per_cu;
9373 item->pretend_language = pretend_language;
9376 if (dwarf2_queue == NULL)
9377 dwarf2_queue = item;
9379 dwarf2_queue_tail->next = item;
9381 dwarf2_queue_tail = item;
9384 /* If PER_CU is not yet queued, add it to the queue.
9385 If DEPENDENT_CU is non-NULL, it has a reference to PER_CU so add a
9387 The result is non-zero if PER_CU was queued, otherwise the result is zero
9388 meaning either PER_CU is already queued or it is already loaded.
9390 N.B. There is an invariant here that if a CU is queued then it is loaded.
9391 The caller is required to load PER_CU if we return non-zero. */
9394 maybe_queue_comp_unit (struct dwarf2_cu *dependent_cu,
9395 struct dwarf2_per_cu_data *per_cu,
9396 enum language pretend_language)
9398 /* We may arrive here during partial symbol reading, if we need full
9399 DIEs to process an unusual case (e.g. template arguments). Do
9400 not queue PER_CU, just tell our caller to load its DIEs. */
9401 if (per_cu->dwarf2_per_objfile->reading_partial_symbols)
9403 if (per_cu->cu == NULL || per_cu->cu->dies == NULL)
9408 /* Mark the dependence relation so that we don't flush PER_CU
9410 if (dependent_cu != NULL)
9411 dwarf2_add_dependence (dependent_cu, per_cu);
9413 /* If it's already on the queue, we have nothing to do. */
9417 /* If the compilation unit is already loaded, just mark it as
9419 if (per_cu->cu != NULL)
9421 per_cu->cu->last_used = 0;
9425 /* Add it to the queue. */
9426 queue_comp_unit (per_cu, pretend_language);
9431 /* Process the queue. */
9434 process_queue (struct dwarf2_per_objfile *dwarf2_per_objfile)
9436 struct dwarf2_queue_item *item, *next_item;
9438 if (dwarf_read_debug)
9440 fprintf_unfiltered (gdb_stdlog,
9441 "Expanding one or more symtabs of objfile %s ...\n",
9442 objfile_name (dwarf2_per_objfile->objfile));
9445 /* The queue starts out with one item, but following a DIE reference
9446 may load a new CU, adding it to the end of the queue. */
9447 for (item = dwarf2_queue; item != NULL; dwarf2_queue = item = next_item)
9449 if ((dwarf2_per_objfile->using_index
9450 ? !item->per_cu->v.quick->compunit_symtab
9451 : (item->per_cu->v.psymtab && !item->per_cu->v.psymtab->readin))
9452 /* Skip dummy CUs. */
9453 && item->per_cu->cu != NULL)
9455 struct dwarf2_per_cu_data *per_cu = item->per_cu;
9456 unsigned int debug_print_threshold;
9459 if (per_cu->is_debug_types)
9461 struct signatured_type *sig_type =
9462 (struct signatured_type *) per_cu;
9464 sprintf (buf, "TU %s at offset %s",
9465 hex_string (sig_type->signature),
9466 sect_offset_str (per_cu->sect_off));
9467 /* There can be 100s of TUs.
9468 Only print them in verbose mode. */
9469 debug_print_threshold = 2;
9473 sprintf (buf, "CU at offset %s",
9474 sect_offset_str (per_cu->sect_off));
9475 debug_print_threshold = 1;
9478 if (dwarf_read_debug >= debug_print_threshold)
9479 fprintf_unfiltered (gdb_stdlog, "Expanding symtab of %s\n", buf);
9481 if (per_cu->is_debug_types)
9482 process_full_type_unit (per_cu, item->pretend_language);
9484 process_full_comp_unit (per_cu, item->pretend_language);
9486 if (dwarf_read_debug >= debug_print_threshold)
9487 fprintf_unfiltered (gdb_stdlog, "Done expanding %s\n", buf);
9490 item->per_cu->queued = 0;
9491 next_item = item->next;
9495 dwarf2_queue_tail = NULL;
9497 if (dwarf_read_debug)
9499 fprintf_unfiltered (gdb_stdlog, "Done expanding symtabs of %s.\n",
9500 objfile_name (dwarf2_per_objfile->objfile));
9504 /* Read in full symbols for PST, and anything it depends on. */
9507 psymtab_to_symtab_1 (struct partial_symtab *pst)
9509 struct dwarf2_per_cu_data *per_cu;
9515 for (i = 0; i < pst->number_of_dependencies; i++)
9516 if (!pst->dependencies[i]->readin
9517 && pst->dependencies[i]->user == NULL)
9519 /* Inform about additional files that need to be read in. */
9522 /* FIXME: i18n: Need to make this a single string. */
9523 fputs_filtered (" ", gdb_stdout);
9525 fputs_filtered ("and ", gdb_stdout);
9527 printf_filtered ("%s...", pst->dependencies[i]->filename);
9528 wrap_here (""); /* Flush output. */
9529 gdb_flush (gdb_stdout);
9531 psymtab_to_symtab_1 (pst->dependencies[i]);
9534 per_cu = (struct dwarf2_per_cu_data *) pst->read_symtab_private;
9538 /* It's an include file, no symbols to read for it.
9539 Everything is in the parent symtab. */
9544 dw2_do_instantiate_symtab (per_cu, false);
9547 /* Trivial hash function for die_info: the hash value of a DIE
9548 is its offset in .debug_info for this objfile. */
9551 die_hash (const void *item)
9553 const struct die_info *die = (const struct die_info *) item;
9555 return to_underlying (die->sect_off);
9558 /* Trivial comparison function for die_info structures: two DIEs
9559 are equal if they have the same offset. */
9562 die_eq (const void *item_lhs, const void *item_rhs)
9564 const struct die_info *die_lhs = (const struct die_info *) item_lhs;
9565 const struct die_info *die_rhs = (const struct die_info *) item_rhs;
9567 return die_lhs->sect_off == die_rhs->sect_off;
9570 /* die_reader_func for load_full_comp_unit.
9571 This is identical to read_signatured_type_reader,
9572 but is kept separate for now. */
9575 load_full_comp_unit_reader (const struct die_reader_specs *reader,
9576 const gdb_byte *info_ptr,
9577 struct die_info *comp_unit_die,
9581 struct dwarf2_cu *cu = reader->cu;
9582 enum language *language_ptr = (enum language *) data;
9584 gdb_assert (cu->die_hash == NULL);
9586 htab_create_alloc_ex (cu->header.length / 12,
9590 &cu->comp_unit_obstack,
9591 hashtab_obstack_allocate,
9592 dummy_obstack_deallocate);
9595 comp_unit_die->child = read_die_and_siblings (reader, info_ptr,
9596 &info_ptr, comp_unit_die);
9597 cu->dies = comp_unit_die;
9598 /* comp_unit_die is not stored in die_hash, no need. */
9600 /* We try not to read any attributes in this function, because not
9601 all CUs needed for references have been loaded yet, and symbol
9602 table processing isn't initialized. But we have to set the CU language,
9603 or we won't be able to build types correctly.
9604 Similarly, if we do not read the producer, we can not apply
9605 producer-specific interpretation. */
9606 prepare_one_comp_unit (cu, cu->dies, *language_ptr);
9609 /* Load the DIEs associated with PER_CU into memory. */
9612 load_full_comp_unit (struct dwarf2_per_cu_data *this_cu,
9614 enum language pretend_language)
9616 gdb_assert (! this_cu->is_debug_types);
9618 init_cutu_and_read_dies (this_cu, NULL, 1, 1, skip_partial,
9619 load_full_comp_unit_reader, &pretend_language);
9622 /* Add a DIE to the delayed physname list. */
9625 add_to_method_list (struct type *type, int fnfield_index, int index,
9626 const char *name, struct die_info *die,
9627 struct dwarf2_cu *cu)
9629 struct delayed_method_info mi;
9631 mi.fnfield_index = fnfield_index;
9635 cu->method_list.push_back (mi);
9638 /* Check whether [PHYSNAME, PHYSNAME+LEN) ends with a modifier like
9639 "const" / "volatile". If so, decrements LEN by the length of the
9640 modifier and return true. Otherwise return false. */
9644 check_modifier (const char *physname, size_t &len, const char (&mod)[N])
9646 size_t mod_len = sizeof (mod) - 1;
9647 if (len > mod_len && startswith (physname + (len - mod_len), mod))
9655 /* Compute the physnames of any methods on the CU's method list.
9657 The computation of method physnames is delayed in order to avoid the
9658 (bad) condition that one of the method's formal parameters is of an as yet
9662 compute_delayed_physnames (struct dwarf2_cu *cu)
9664 /* Only C++ delays computing physnames. */
9665 if (cu->method_list.empty ())
9667 gdb_assert (cu->language == language_cplus);
9669 for (const delayed_method_info &mi : cu->method_list)
9671 const char *physname;
9672 struct fn_fieldlist *fn_flp
9673 = &TYPE_FN_FIELDLIST (mi.type, mi.fnfield_index);
9674 physname = dwarf2_physname (mi.name, mi.die, cu);
9675 TYPE_FN_FIELD_PHYSNAME (fn_flp->fn_fields, mi.index)
9676 = physname ? physname : "";
9678 /* Since there's no tag to indicate whether a method is a
9679 const/volatile overload, extract that information out of the
9681 if (physname != NULL)
9683 size_t len = strlen (physname);
9687 if (physname[len] == ')') /* shortcut */
9689 else if (check_modifier (physname, len, " const"))
9690 TYPE_FN_FIELD_CONST (fn_flp->fn_fields, mi.index) = 1;
9691 else if (check_modifier (physname, len, " volatile"))
9692 TYPE_FN_FIELD_VOLATILE (fn_flp->fn_fields, mi.index) = 1;
9699 /* The list is no longer needed. */
9700 cu->method_list.clear ();
9703 /* A wrapper for add_symbol_to_list to ensure that SYMBOL's language is
9704 the same as all other symbols in LISTHEAD. If a new symbol is added
9705 with a different language, this function asserts. */
9708 dw2_add_symbol_to_list (struct symbol *symbol, struct pending **listhead)
9710 /* Only assert if LISTHEAD already contains symbols of a different
9711 language (dict_create_hashed/insert_symbol_hashed requires that all
9712 symbols in this list are of the same language). */
9713 gdb_assert ((*listhead) == NULL
9714 || (SYMBOL_LANGUAGE ((*listhead)->symbol[0])
9715 == SYMBOL_LANGUAGE (symbol)));
9717 add_symbol_to_list (symbol, listhead);
9720 /* Go objects should be embedded in a DW_TAG_module DIE,
9721 and it's not clear if/how imported objects will appear.
9722 To keep Go support simple until that's worked out,
9723 go back through what we've read and create something usable.
9724 We could do this while processing each DIE, and feels kinda cleaner,
9725 but that way is more invasive.
9726 This is to, for example, allow the user to type "p var" or "b main"
9727 without having to specify the package name, and allow lookups
9728 of module.object to work in contexts that use the expression
9732 fixup_go_packaging (struct dwarf2_cu *cu)
9734 char *package_name = NULL;
9735 struct pending *list;
9738 for (list = global_symbols; list != NULL; list = list->next)
9740 for (i = 0; i < list->nsyms; ++i)
9742 struct symbol *sym = list->symbol[i];
9744 if (SYMBOL_LANGUAGE (sym) == language_go
9745 && SYMBOL_CLASS (sym) == LOC_BLOCK)
9747 char *this_package_name = go_symbol_package_name (sym);
9749 if (this_package_name == NULL)
9751 if (package_name == NULL)
9752 package_name = this_package_name;
9755 struct objfile *objfile
9756 = cu->per_cu->dwarf2_per_objfile->objfile;
9757 if (strcmp (package_name, this_package_name) != 0)
9758 complaint (_("Symtab %s has objects from two different Go packages: %s and %s"),
9759 (symbol_symtab (sym) != NULL
9760 ? symtab_to_filename_for_display
9761 (symbol_symtab (sym))
9762 : objfile_name (objfile)),
9763 this_package_name, package_name);
9764 xfree (this_package_name);
9770 if (package_name != NULL)
9772 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
9773 const char *saved_package_name
9774 = (const char *) obstack_copy0 (&objfile->per_bfd->storage_obstack,
9776 strlen (package_name));
9777 struct type *type = init_type (objfile, TYPE_CODE_MODULE, 0,
9778 saved_package_name);
9781 sym = allocate_symbol (objfile);
9782 SYMBOL_SET_LANGUAGE (sym, language_go, &objfile->objfile_obstack);
9783 SYMBOL_SET_NAMES (sym, saved_package_name,
9784 strlen (saved_package_name), 0, objfile);
9785 /* This is not VAR_DOMAIN because we want a way to ensure a lookup of,
9786 e.g., "main" finds the "main" module and not C's main(). */
9787 SYMBOL_DOMAIN (sym) = STRUCT_DOMAIN;
9788 SYMBOL_ACLASS_INDEX (sym) = LOC_TYPEDEF;
9789 SYMBOL_TYPE (sym) = type;
9791 dw2_add_symbol_to_list (sym, &global_symbols);
9793 xfree (package_name);
9797 /* Allocate a fully-qualified name consisting of the two parts on the
9801 rust_fully_qualify (struct obstack *obstack, const char *p1, const char *p2)
9803 return obconcat (obstack, p1, "::", p2, (char *) NULL);
9806 /* A helper that allocates a struct discriminant_info to attach to a
9809 static struct discriminant_info *
9810 alloc_discriminant_info (struct type *type, int discriminant_index,
9813 gdb_assert (TYPE_CODE (type) == TYPE_CODE_UNION);
9814 gdb_assert (discriminant_index == -1
9815 || (discriminant_index >= 0
9816 && discriminant_index < TYPE_NFIELDS (type)));
9817 gdb_assert (default_index == -1
9818 || (default_index >= 0 && default_index < TYPE_NFIELDS (type)));
9820 TYPE_FLAG_DISCRIMINATED_UNION (type) = 1;
9822 struct discriminant_info *disc
9823 = ((struct discriminant_info *)
9825 offsetof (struct discriminant_info, discriminants)
9826 + TYPE_NFIELDS (type) * sizeof (disc->discriminants[0])));
9827 disc->default_index = default_index;
9828 disc->discriminant_index = discriminant_index;
9830 struct dynamic_prop prop;
9831 prop.kind = PROP_UNDEFINED;
9832 prop.data.baton = disc;
9834 add_dyn_prop (DYN_PROP_DISCRIMINATED, prop, type);
9839 /* Some versions of rustc emitted enums in an unusual way.
9841 Ordinary enums were emitted as unions. The first element of each
9842 structure in the union was named "RUST$ENUM$DISR". This element
9843 held the discriminant.
9845 These versions of Rust also implemented the "non-zero"
9846 optimization. When the enum had two values, and one is empty and
9847 the other holds a pointer that cannot be zero, the pointer is used
9848 as the discriminant, with a zero value meaning the empty variant.
9849 Here, the union's first member is of the form
9850 RUST$ENCODED$ENUM$<fieldno>$<fieldno>$...$<variantname>
9851 where the fieldnos are the indices of the fields that should be
9852 traversed in order to find the field (which may be several fields deep)
9853 and the variantname is the name of the variant of the case when the
9856 This function recognizes whether TYPE is of one of these forms,
9857 and, if so, smashes it to be a variant type. */
9860 quirk_rust_enum (struct type *type, struct objfile *objfile)
9862 gdb_assert (TYPE_CODE (type) == TYPE_CODE_UNION);
9864 /* We don't need to deal with empty enums. */
9865 if (TYPE_NFIELDS (type) == 0)
9868 #define RUST_ENUM_PREFIX "RUST$ENCODED$ENUM$"
9869 if (TYPE_NFIELDS (type) == 1
9870 && startswith (TYPE_FIELD_NAME (type, 0), RUST_ENUM_PREFIX))
9872 const char *name = TYPE_FIELD_NAME (type, 0) + strlen (RUST_ENUM_PREFIX);
9874 /* Decode the field name to find the offset of the
9876 ULONGEST bit_offset = 0;
9877 struct type *field_type = TYPE_FIELD_TYPE (type, 0);
9878 while (name[0] >= '0' && name[0] <= '9')
9881 unsigned long index = strtoul (name, &tail, 10);
9884 || index >= TYPE_NFIELDS (field_type)
9885 || (TYPE_FIELD_LOC_KIND (field_type, index)
9886 != FIELD_LOC_KIND_BITPOS))
9888 complaint (_("Could not parse Rust enum encoding string \"%s\""
9890 TYPE_FIELD_NAME (type, 0),
9891 objfile_name (objfile));
9896 bit_offset += TYPE_FIELD_BITPOS (field_type, index);
9897 field_type = TYPE_FIELD_TYPE (field_type, index);
9900 /* Make a union to hold the variants. */
9901 struct type *union_type = alloc_type (objfile);
9902 TYPE_CODE (union_type) = TYPE_CODE_UNION;
9903 TYPE_NFIELDS (union_type) = 3;
9904 TYPE_FIELDS (union_type)
9905 = (struct field *) TYPE_ZALLOC (type, 3 * sizeof (struct field));
9906 TYPE_LENGTH (union_type) = TYPE_LENGTH (type);
9907 set_type_align (union_type, TYPE_RAW_ALIGN (type));
9909 /* Put the discriminant must at index 0. */
9910 TYPE_FIELD_TYPE (union_type, 0) = field_type;
9911 TYPE_FIELD_ARTIFICIAL (union_type, 0) = 1;
9912 TYPE_FIELD_NAME (union_type, 0) = "<<discriminant>>";
9913 SET_FIELD_BITPOS (TYPE_FIELD (union_type, 0), bit_offset);
9915 /* The order of fields doesn't really matter, so put the real
9916 field at index 1 and the data-less field at index 2. */
9917 struct discriminant_info *disc
9918 = alloc_discriminant_info (union_type, 0, 1);
9919 TYPE_FIELD (union_type, 1) = TYPE_FIELD (type, 0);
9920 TYPE_FIELD_NAME (union_type, 1)
9921 = rust_last_path_segment (TYPE_NAME (TYPE_FIELD_TYPE (union_type, 1)));
9922 TYPE_NAME (TYPE_FIELD_TYPE (union_type, 1))
9923 = rust_fully_qualify (&objfile->objfile_obstack, TYPE_NAME (type),
9924 TYPE_FIELD_NAME (union_type, 1));
9926 const char *dataless_name
9927 = rust_fully_qualify (&objfile->objfile_obstack, TYPE_NAME (type),
9929 struct type *dataless_type = init_type (objfile, TYPE_CODE_VOID, 0,
9931 TYPE_FIELD_TYPE (union_type, 2) = dataless_type;
9932 /* NAME points into the original discriminant name, which
9933 already has the correct lifetime. */
9934 TYPE_FIELD_NAME (union_type, 2) = name;
9935 SET_FIELD_BITPOS (TYPE_FIELD (union_type, 2), 0);
9936 disc->discriminants[2] = 0;
9938 /* Smash this type to be a structure type. We have to do this
9939 because the type has already been recorded. */
9940 TYPE_CODE (type) = TYPE_CODE_STRUCT;
9941 TYPE_NFIELDS (type) = 1;
9943 = (struct field *) TYPE_ZALLOC (type, sizeof (struct field));
9945 /* Install the variant part. */
9946 TYPE_FIELD_TYPE (type, 0) = union_type;
9947 SET_FIELD_BITPOS (TYPE_FIELD (type, 0), 0);
9948 TYPE_FIELD_NAME (type, 0) = "<<variants>>";
9950 else if (TYPE_NFIELDS (type) == 1)
9952 /* We assume that a union with a single field is a univariant
9954 /* Smash this type to be a structure type. We have to do this
9955 because the type has already been recorded. */
9956 TYPE_CODE (type) = TYPE_CODE_STRUCT;
9958 /* Make a union to hold the variants. */
9959 struct type *union_type = alloc_type (objfile);
9960 TYPE_CODE (union_type) = TYPE_CODE_UNION;
9961 TYPE_NFIELDS (union_type) = TYPE_NFIELDS (type);
9962 TYPE_LENGTH (union_type) = TYPE_LENGTH (type);
9963 set_type_align (union_type, TYPE_RAW_ALIGN (type));
9964 TYPE_FIELDS (union_type) = TYPE_FIELDS (type);
9966 struct type *field_type = TYPE_FIELD_TYPE (union_type, 0);
9967 const char *variant_name
9968 = rust_last_path_segment (TYPE_NAME (field_type));
9969 TYPE_FIELD_NAME (union_type, 0) = variant_name;
9970 TYPE_NAME (field_type)
9971 = rust_fully_qualify (&objfile->objfile_obstack,
9972 TYPE_NAME (type), variant_name);
9974 /* Install the union in the outer struct type. */
9975 TYPE_NFIELDS (type) = 1;
9977 = (struct field *) TYPE_ZALLOC (union_type, sizeof (struct field));
9978 TYPE_FIELD_TYPE (type, 0) = union_type;
9979 TYPE_FIELD_NAME (type, 0) = "<<variants>>";
9980 SET_FIELD_BITPOS (TYPE_FIELD (type, 0), 0);
9982 alloc_discriminant_info (union_type, -1, 0);
9986 struct type *disr_type = nullptr;
9987 for (int i = 0; i < TYPE_NFIELDS (type); ++i)
9989 disr_type = TYPE_FIELD_TYPE (type, i);
9991 if (TYPE_CODE (disr_type) != TYPE_CODE_STRUCT)
9993 /* All fields of a true enum will be structs. */
9996 else if (TYPE_NFIELDS (disr_type) == 0)
9998 /* Could be data-less variant, so keep going. */
9999 disr_type = nullptr;
10001 else if (strcmp (TYPE_FIELD_NAME (disr_type, 0),
10002 "RUST$ENUM$DISR") != 0)
10004 /* Not a Rust enum. */
10014 /* If we got here without a discriminant, then it's probably
10016 if (disr_type == nullptr)
10019 /* Smash this type to be a structure type. We have to do this
10020 because the type has already been recorded. */
10021 TYPE_CODE (type) = TYPE_CODE_STRUCT;
10023 /* Make a union to hold the variants. */
10024 struct field *disr_field = &TYPE_FIELD (disr_type, 0);
10025 struct type *union_type = alloc_type (objfile);
10026 TYPE_CODE (union_type) = TYPE_CODE_UNION;
10027 TYPE_NFIELDS (union_type) = 1 + TYPE_NFIELDS (type);
10028 TYPE_LENGTH (union_type) = TYPE_LENGTH (type);
10029 set_type_align (union_type, TYPE_RAW_ALIGN (type));
10030 TYPE_FIELDS (union_type)
10031 = (struct field *) TYPE_ZALLOC (union_type,
10032 (TYPE_NFIELDS (union_type)
10033 * sizeof (struct field)));
10035 memcpy (TYPE_FIELDS (union_type) + 1, TYPE_FIELDS (type),
10036 TYPE_NFIELDS (type) * sizeof (struct field));
10038 /* Install the discriminant at index 0 in the union. */
10039 TYPE_FIELD (union_type, 0) = *disr_field;
10040 TYPE_FIELD_ARTIFICIAL (union_type, 0) = 1;
10041 TYPE_FIELD_NAME (union_type, 0) = "<<discriminant>>";
10043 /* Install the union in the outer struct type. */
10044 TYPE_FIELD_TYPE (type, 0) = union_type;
10045 TYPE_FIELD_NAME (type, 0) = "<<variants>>";
10046 TYPE_NFIELDS (type) = 1;
10048 /* Set the size and offset of the union type. */
10049 SET_FIELD_BITPOS (TYPE_FIELD (type, 0), 0);
10051 /* We need a way to find the correct discriminant given a
10052 variant name. For convenience we build a map here. */
10053 struct type *enum_type = FIELD_TYPE (*disr_field);
10054 std::unordered_map<std::string, ULONGEST> discriminant_map;
10055 for (int i = 0; i < TYPE_NFIELDS (enum_type); ++i)
10057 if (TYPE_FIELD_LOC_KIND (enum_type, i) == FIELD_LOC_KIND_ENUMVAL)
10060 = rust_last_path_segment (TYPE_FIELD_NAME (enum_type, i));
10061 discriminant_map[name] = TYPE_FIELD_ENUMVAL (enum_type, i);
10065 int n_fields = TYPE_NFIELDS (union_type);
10066 struct discriminant_info *disc
10067 = alloc_discriminant_info (union_type, 0, -1);
10068 /* Skip the discriminant here. */
10069 for (int i = 1; i < n_fields; ++i)
10071 /* Find the final word in the name of this variant's type.
10072 That name can be used to look up the correct
10074 const char *variant_name
10075 = rust_last_path_segment (TYPE_NAME (TYPE_FIELD_TYPE (union_type,
10078 auto iter = discriminant_map.find (variant_name);
10079 if (iter != discriminant_map.end ())
10080 disc->discriminants[i] = iter->second;
10082 /* Remove the discriminant field, if it exists. */
10083 struct type *sub_type = TYPE_FIELD_TYPE (union_type, i);
10084 if (TYPE_NFIELDS (sub_type) > 0)
10086 --TYPE_NFIELDS (sub_type);
10087 ++TYPE_FIELDS (sub_type);
10089 TYPE_FIELD_NAME (union_type, i) = variant_name;
10090 TYPE_NAME (sub_type)
10091 = rust_fully_qualify (&objfile->objfile_obstack,
10092 TYPE_NAME (type), variant_name);
10097 /* Rewrite some Rust unions to be structures with variants parts. */
10100 rust_union_quirks (struct dwarf2_cu *cu)
10102 gdb_assert (cu->language == language_rust);
10103 for (type *type_ : cu->rust_unions)
10104 quirk_rust_enum (type_, cu->per_cu->dwarf2_per_objfile->objfile);
10105 /* We don't need this any more. */
10106 cu->rust_unions.clear ();
10109 /* Return the symtab for PER_CU. This works properly regardless of
10110 whether we're using the index or psymtabs. */
10112 static struct compunit_symtab *
10113 get_compunit_symtab (struct dwarf2_per_cu_data *per_cu)
10115 return (per_cu->dwarf2_per_objfile->using_index
10116 ? per_cu->v.quick->compunit_symtab
10117 : per_cu->v.psymtab->compunit_symtab);
10120 /* A helper function for computing the list of all symbol tables
10121 included by PER_CU. */
10124 recursively_compute_inclusions (VEC (compunit_symtab_ptr) **result,
10125 htab_t all_children, htab_t all_type_symtabs,
10126 struct dwarf2_per_cu_data *per_cu,
10127 struct compunit_symtab *immediate_parent)
10131 struct compunit_symtab *cust;
10132 struct dwarf2_per_cu_data *iter;
10134 slot = htab_find_slot (all_children, per_cu, INSERT);
10137 /* This inclusion and its children have been processed. */
10142 /* Only add a CU if it has a symbol table. */
10143 cust = get_compunit_symtab (per_cu);
10146 /* If this is a type unit only add its symbol table if we haven't
10147 seen it yet (type unit per_cu's can share symtabs). */
10148 if (per_cu->is_debug_types)
10150 slot = htab_find_slot (all_type_symtabs, cust, INSERT);
10154 VEC_safe_push (compunit_symtab_ptr, *result, cust);
10155 if (cust->user == NULL)
10156 cust->user = immediate_parent;
10161 VEC_safe_push (compunit_symtab_ptr, *result, cust);
10162 if (cust->user == NULL)
10163 cust->user = immediate_parent;
10168 VEC_iterate (dwarf2_per_cu_ptr, per_cu->imported_symtabs, ix, iter);
10171 recursively_compute_inclusions (result, all_children,
10172 all_type_symtabs, iter, cust);
10176 /* Compute the compunit_symtab 'includes' fields for the compunit_symtab of
10180 compute_compunit_symtab_includes (struct dwarf2_per_cu_data *per_cu)
10182 gdb_assert (! per_cu->is_debug_types);
10184 if (!VEC_empty (dwarf2_per_cu_ptr, per_cu->imported_symtabs))
10187 struct dwarf2_per_cu_data *per_cu_iter;
10188 struct compunit_symtab *compunit_symtab_iter;
10189 VEC (compunit_symtab_ptr) *result_symtabs = NULL;
10190 htab_t all_children, all_type_symtabs;
10191 struct compunit_symtab *cust = get_compunit_symtab (per_cu);
10193 /* If we don't have a symtab, we can just skip this case. */
10197 all_children = htab_create_alloc (1, htab_hash_pointer, htab_eq_pointer,
10198 NULL, xcalloc, xfree);
10199 all_type_symtabs = htab_create_alloc (1, htab_hash_pointer, htab_eq_pointer,
10200 NULL, xcalloc, xfree);
10203 VEC_iterate (dwarf2_per_cu_ptr, per_cu->imported_symtabs,
10207 recursively_compute_inclusions (&result_symtabs, all_children,
10208 all_type_symtabs, per_cu_iter,
10212 /* Now we have a transitive closure of all the included symtabs. */
10213 len = VEC_length (compunit_symtab_ptr, result_symtabs);
10215 = XOBNEWVEC (&per_cu->dwarf2_per_objfile->objfile->objfile_obstack,
10216 struct compunit_symtab *, len + 1);
10218 VEC_iterate (compunit_symtab_ptr, result_symtabs, ix,
10219 compunit_symtab_iter);
10221 cust->includes[ix] = compunit_symtab_iter;
10222 cust->includes[len] = NULL;
10224 VEC_free (compunit_symtab_ptr, result_symtabs);
10225 htab_delete (all_children);
10226 htab_delete (all_type_symtabs);
10230 /* Compute the 'includes' field for the symtabs of all the CUs we just
10234 process_cu_includes (struct dwarf2_per_objfile *dwarf2_per_objfile)
10236 for (dwarf2_per_cu_data *iter : dwarf2_per_objfile->just_read_cus)
10238 if (! iter->is_debug_types)
10239 compute_compunit_symtab_includes (iter);
10242 dwarf2_per_objfile->just_read_cus.clear ();
10245 /* Generate full symbol information for PER_CU, whose DIEs have
10246 already been loaded into memory. */
10249 process_full_comp_unit (struct dwarf2_per_cu_data *per_cu,
10250 enum language pretend_language)
10252 struct dwarf2_cu *cu = per_cu->cu;
10253 struct dwarf2_per_objfile *dwarf2_per_objfile = per_cu->dwarf2_per_objfile;
10254 struct objfile *objfile = dwarf2_per_objfile->objfile;
10255 struct gdbarch *gdbarch = get_objfile_arch (objfile);
10256 CORE_ADDR lowpc, highpc;
10257 struct compunit_symtab *cust;
10258 CORE_ADDR baseaddr;
10259 struct block *static_block;
10262 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
10265 scoped_free_pendings free_pending;
10267 /* Clear the list here in case something was left over. */
10268 cu->method_list.clear ();
10270 cu->list_in_scope = &file_symbols;
10272 cu->language = pretend_language;
10273 cu->language_defn = language_def (cu->language);
10275 /* Do line number decoding in read_file_scope () */
10276 process_die (cu->dies, cu);
10278 /* For now fudge the Go package. */
10279 if (cu->language == language_go)
10280 fixup_go_packaging (cu);
10282 /* Now that we have processed all the DIEs in the CU, all the types
10283 should be complete, and it should now be safe to compute all of the
10285 compute_delayed_physnames (cu);
10287 if (cu->language == language_rust)
10288 rust_union_quirks (cu);
10290 /* Some compilers don't define a DW_AT_high_pc attribute for the
10291 compilation unit. If the DW_AT_high_pc is missing, synthesize
10292 it, by scanning the DIE's below the compilation unit. */
10293 get_scope_pc_bounds (cu->dies, &lowpc, &highpc, cu);
10295 addr = gdbarch_adjust_dwarf2_addr (gdbarch, highpc + baseaddr);
10296 static_block = end_symtab_get_static_block (addr, 0, 1);
10298 /* If the comp unit has DW_AT_ranges, it may have discontiguous ranges.
10299 Also, DW_AT_ranges may record ranges not belonging to any child DIEs
10300 (such as virtual method tables). Record the ranges in STATIC_BLOCK's
10301 addrmap to help ensure it has an accurate map of pc values belonging to
10303 dwarf2_record_block_ranges (cu->dies, static_block, baseaddr, cu);
10305 cust = end_symtab_from_static_block (static_block,
10306 SECT_OFF_TEXT (objfile), 0);
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);
10353 /* Generate full symbol information for type unit PER_CU, whose DIEs have
10354 already been loaded into memory. */
10357 process_full_type_unit (struct dwarf2_per_cu_data *per_cu,
10358 enum language pretend_language)
10360 struct dwarf2_cu *cu = per_cu->cu;
10361 struct dwarf2_per_objfile *dwarf2_per_objfile = per_cu->dwarf2_per_objfile;
10362 struct objfile *objfile = dwarf2_per_objfile->objfile;
10363 struct compunit_symtab *cust;
10364 struct signatured_type *sig_type;
10366 gdb_assert (per_cu->is_debug_types);
10367 sig_type = (struct signatured_type *) per_cu;
10370 scoped_free_pendings free_pending;
10372 /* Clear the list here in case something was left over. */
10373 cu->method_list.clear ();
10375 cu->list_in_scope = &file_symbols;
10377 cu->language = pretend_language;
10378 cu->language_defn = language_def (cu->language);
10380 /* The symbol tables are set up in read_type_unit_scope. */
10381 process_die (cu->dies, cu);
10383 /* For now fudge the Go package. */
10384 if (cu->language == language_go)
10385 fixup_go_packaging (cu);
10387 /* Now that we have processed all the DIEs in the CU, all the types
10388 should be complete, and it should now be safe to compute all of the
10390 compute_delayed_physnames (cu);
10392 if (cu->language == language_rust)
10393 rust_union_quirks (cu);
10395 /* TUs share symbol tables.
10396 If this is the first TU to use this symtab, complete the construction
10397 of it with end_expandable_symtab. Otherwise, complete the addition of
10398 this TU's symbols to the existing symtab. */
10399 if (sig_type->type_unit_group->compunit_symtab == NULL)
10401 cust = end_expandable_symtab (0, SECT_OFF_TEXT (objfile));
10402 sig_type->type_unit_group->compunit_symtab = cust;
10406 /* Set symtab language to language from DW_AT_language. If the
10407 compilation is from a C file generated by language preprocessors,
10408 do not set the language if it was already deduced by
10410 if (!(cu->language == language_c
10411 && COMPUNIT_FILETABS (cust)->language != language_c))
10412 COMPUNIT_FILETABS (cust)->language = cu->language;
10417 augment_type_symtab ();
10418 cust = sig_type->type_unit_group->compunit_symtab;
10421 if (dwarf2_per_objfile->using_index)
10422 per_cu->v.quick->compunit_symtab = cust;
10425 struct partial_symtab *pst = per_cu->v.psymtab;
10426 pst->compunit_symtab = cust;
10431 /* Process an imported unit DIE. */
10434 process_imported_unit_die (struct die_info *die, struct dwarf2_cu *cu)
10436 struct attribute *attr;
10438 /* For now we don't handle imported units in type units. */
10439 if (cu->per_cu->is_debug_types)
10441 error (_("Dwarf Error: DW_TAG_imported_unit is not"
10442 " supported in type units [in module %s]"),
10443 objfile_name (cu->per_cu->dwarf2_per_objfile->objfile));
10446 attr = dwarf2_attr (die, DW_AT_import, cu);
10449 sect_offset sect_off = dwarf2_get_ref_die_offset (attr);
10450 bool is_dwz = (attr->form == DW_FORM_GNU_ref_alt || cu->per_cu->is_dwz);
10451 dwarf2_per_cu_data *per_cu
10452 = dwarf2_find_containing_comp_unit (sect_off, is_dwz,
10453 cu->per_cu->dwarf2_per_objfile);
10455 /* If necessary, add it to the queue and load its DIEs. */
10456 if (maybe_queue_comp_unit (cu, per_cu, cu->language))
10457 load_full_comp_unit (per_cu, false, cu->language);
10459 VEC_safe_push (dwarf2_per_cu_ptr, cu->per_cu->imported_symtabs,
10464 /* RAII object that represents a process_die scope: i.e.,
10465 starts/finishes processing a DIE. */
10466 class process_die_scope
10469 process_die_scope (die_info *die, dwarf2_cu *cu)
10470 : m_die (die), m_cu (cu)
10472 /* We should only be processing DIEs not already in process. */
10473 gdb_assert (!m_die->in_process);
10474 m_die->in_process = true;
10477 ~process_die_scope ()
10479 m_die->in_process = false;
10481 /* If we're done processing the DIE for the CU that owns the line
10482 header, we don't need the line header anymore. */
10483 if (m_cu->line_header_die_owner == m_die)
10485 delete m_cu->line_header;
10486 m_cu->line_header = NULL;
10487 m_cu->line_header_die_owner = NULL;
10496 /* Process a die and its children. */
10499 process_die (struct die_info *die, struct dwarf2_cu *cu)
10501 process_die_scope scope (die, cu);
10505 case DW_TAG_padding:
10507 case DW_TAG_compile_unit:
10508 case DW_TAG_partial_unit:
10509 read_file_scope (die, cu);
10511 case DW_TAG_type_unit:
10512 read_type_unit_scope (die, cu);
10514 case DW_TAG_subprogram:
10515 case DW_TAG_inlined_subroutine:
10516 read_func_scope (die, cu);
10518 case DW_TAG_lexical_block:
10519 case DW_TAG_try_block:
10520 case DW_TAG_catch_block:
10521 read_lexical_block_scope (die, cu);
10523 case DW_TAG_call_site:
10524 case DW_TAG_GNU_call_site:
10525 read_call_site_scope (die, cu);
10527 case DW_TAG_class_type:
10528 case DW_TAG_interface_type:
10529 case DW_TAG_structure_type:
10530 case DW_TAG_union_type:
10531 process_structure_scope (die, cu);
10533 case DW_TAG_enumeration_type:
10534 process_enumeration_scope (die, cu);
10537 /* These dies have a type, but processing them does not create
10538 a symbol or recurse to process the children. Therefore we can
10539 read them on-demand through read_type_die. */
10540 case DW_TAG_subroutine_type:
10541 case DW_TAG_set_type:
10542 case DW_TAG_array_type:
10543 case DW_TAG_pointer_type:
10544 case DW_TAG_ptr_to_member_type:
10545 case DW_TAG_reference_type:
10546 case DW_TAG_rvalue_reference_type:
10547 case DW_TAG_string_type:
10550 case DW_TAG_base_type:
10551 case DW_TAG_subrange_type:
10552 case DW_TAG_typedef:
10553 /* Add a typedef symbol for the type definition, if it has a
10555 new_symbol (die, read_type_die (die, cu), cu);
10557 case DW_TAG_common_block:
10558 read_common_block (die, cu);
10560 case DW_TAG_common_inclusion:
10562 case DW_TAG_namespace:
10563 cu->processing_has_namespace_info = 1;
10564 read_namespace (die, cu);
10566 case DW_TAG_module:
10567 cu->processing_has_namespace_info = 1;
10568 read_module (die, cu);
10570 case DW_TAG_imported_declaration:
10571 cu->processing_has_namespace_info = 1;
10572 if (read_namespace_alias (die, cu))
10574 /* The declaration is not a global namespace alias. */
10575 /* Fall through. */
10576 case DW_TAG_imported_module:
10577 cu->processing_has_namespace_info = 1;
10578 if (die->child != NULL && (die->tag == DW_TAG_imported_declaration
10579 || cu->language != language_fortran))
10580 complaint (_("Tag '%s' has unexpected children"),
10581 dwarf_tag_name (die->tag));
10582 read_import_statement (die, cu);
10585 case DW_TAG_imported_unit:
10586 process_imported_unit_die (die, cu);
10589 case DW_TAG_variable:
10590 read_variable (die, cu);
10594 new_symbol (die, NULL, cu);
10599 /* DWARF name computation. */
10601 /* A helper function for dwarf2_compute_name which determines whether DIE
10602 needs to have the name of the scope prepended to the name listed in the
10606 die_needs_namespace (struct die_info *die, struct dwarf2_cu *cu)
10608 struct attribute *attr;
10612 case DW_TAG_namespace:
10613 case DW_TAG_typedef:
10614 case DW_TAG_class_type:
10615 case DW_TAG_interface_type:
10616 case DW_TAG_structure_type:
10617 case DW_TAG_union_type:
10618 case DW_TAG_enumeration_type:
10619 case DW_TAG_enumerator:
10620 case DW_TAG_subprogram:
10621 case DW_TAG_inlined_subroutine:
10622 case DW_TAG_member:
10623 case DW_TAG_imported_declaration:
10626 case DW_TAG_variable:
10627 case DW_TAG_constant:
10628 /* We only need to prefix "globally" visible variables. These include
10629 any variable marked with DW_AT_external or any variable that
10630 lives in a namespace. [Variables in anonymous namespaces
10631 require prefixing, but they are not DW_AT_external.] */
10633 if (dwarf2_attr (die, DW_AT_specification, cu))
10635 struct dwarf2_cu *spec_cu = cu;
10637 return die_needs_namespace (die_specification (die, &spec_cu),
10641 attr = dwarf2_attr (die, DW_AT_external, cu);
10642 if (attr == NULL && die->parent->tag != DW_TAG_namespace
10643 && die->parent->tag != DW_TAG_module)
10645 /* A variable in a lexical block of some kind does not need a
10646 namespace, even though in C++ such variables may be external
10647 and have a mangled name. */
10648 if (die->parent->tag == DW_TAG_lexical_block
10649 || die->parent->tag == DW_TAG_try_block
10650 || die->parent->tag == DW_TAG_catch_block
10651 || die->parent->tag == DW_TAG_subprogram)
10660 /* Return the DIE's linkage name attribute, either DW_AT_linkage_name
10661 or DW_AT_MIPS_linkage_name. Returns NULL if the attribute is not
10662 defined for the given DIE. */
10664 static struct attribute *
10665 dw2_linkage_name_attr (struct die_info *die, struct dwarf2_cu *cu)
10667 struct attribute *attr;
10669 attr = dwarf2_attr (die, DW_AT_linkage_name, cu);
10671 attr = dwarf2_attr (die, DW_AT_MIPS_linkage_name, cu);
10676 /* Return the DIE's linkage name as a string, either DW_AT_linkage_name
10677 or DW_AT_MIPS_linkage_name. Returns NULL if the attribute is not
10678 defined for the given DIE. */
10680 static const char *
10681 dw2_linkage_name (struct die_info *die, struct dwarf2_cu *cu)
10683 const char *linkage_name;
10685 linkage_name = dwarf2_string_attr (die, DW_AT_linkage_name, cu);
10686 if (linkage_name == NULL)
10687 linkage_name = dwarf2_string_attr (die, DW_AT_MIPS_linkage_name, cu);
10689 return linkage_name;
10692 /* Compute the fully qualified name of DIE in CU. If PHYSNAME is nonzero,
10693 compute the physname for the object, which include a method's:
10694 - formal parameters (C++),
10695 - receiver type (Go),
10697 The term "physname" is a bit confusing.
10698 For C++, for example, it is the demangled name.
10699 For Go, for example, it's the mangled name.
10701 For Ada, return the DIE's linkage name rather than the fully qualified
10702 name. PHYSNAME is ignored..
10704 The result is allocated on the objfile_obstack and canonicalized. */
10706 static const char *
10707 dwarf2_compute_name (const char *name,
10708 struct die_info *die, struct dwarf2_cu *cu,
10711 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
10714 name = dwarf2_name (die, cu);
10716 /* For Fortran GDB prefers DW_AT_*linkage_name for the physname if present
10717 but otherwise compute it by typename_concat inside GDB.
10718 FIXME: Actually this is not really true, or at least not always true.
10719 It's all very confusing. SYMBOL_SET_NAMES doesn't try to demangle
10720 Fortran names because there is no mangling standard. So new_symbol
10721 will set the demangled name to the result of dwarf2_full_name, and it is
10722 the demangled name that GDB uses if it exists. */
10723 if (cu->language == language_ada
10724 || (cu->language == language_fortran && physname))
10726 /* For Ada unit, we prefer the linkage name over the name, as
10727 the former contains the exported name, which the user expects
10728 to be able to reference. Ideally, we want the user to be able
10729 to reference this entity using either natural or linkage name,
10730 but we haven't started looking at this enhancement yet. */
10731 const char *linkage_name = dw2_linkage_name (die, cu);
10733 if (linkage_name != NULL)
10734 return linkage_name;
10737 /* These are the only languages we know how to qualify names in. */
10739 && (cu->language == language_cplus
10740 || cu->language == language_fortran || cu->language == language_d
10741 || cu->language == language_rust))
10743 if (die_needs_namespace (die, cu))
10745 const char *prefix;
10746 const char *canonical_name = NULL;
10750 prefix = determine_prefix (die, cu);
10751 if (*prefix != '\0')
10753 char *prefixed_name = typename_concat (NULL, prefix, name,
10756 buf.puts (prefixed_name);
10757 xfree (prefixed_name);
10762 /* Template parameters may be specified in the DIE's DW_AT_name, or
10763 as children with DW_TAG_template_type_param or
10764 DW_TAG_value_type_param. If the latter, add them to the name
10765 here. If the name already has template parameters, then
10766 skip this step; some versions of GCC emit both, and
10767 it is more efficient to use the pre-computed name.
10769 Something to keep in mind about this process: it is very
10770 unlikely, or in some cases downright impossible, to produce
10771 something that will match the mangled name of a function.
10772 If the definition of the function has the same debug info,
10773 we should be able to match up with it anyway. But fallbacks
10774 using the minimal symbol, for instance to find a method
10775 implemented in a stripped copy of libstdc++, will not work.
10776 If we do not have debug info for the definition, we will have to
10777 match them up some other way.
10779 When we do name matching there is a related problem with function
10780 templates; two instantiated function templates are allowed to
10781 differ only by their return types, which we do not add here. */
10783 if (cu->language == language_cplus && strchr (name, '<') == NULL)
10785 struct attribute *attr;
10786 struct die_info *child;
10789 die->building_fullname = 1;
10791 for (child = die->child; child != NULL; child = child->sibling)
10795 const gdb_byte *bytes;
10796 struct dwarf2_locexpr_baton *baton;
10799 if (child->tag != DW_TAG_template_type_param
10800 && child->tag != DW_TAG_template_value_param)
10811 attr = dwarf2_attr (child, DW_AT_type, cu);
10814 complaint (_("template parameter missing DW_AT_type"));
10815 buf.puts ("UNKNOWN_TYPE");
10818 type = die_type (child, cu);
10820 if (child->tag == DW_TAG_template_type_param)
10822 c_print_type (type, "", &buf, -1, 0, cu->language,
10823 &type_print_raw_options);
10827 attr = dwarf2_attr (child, DW_AT_const_value, cu);
10830 complaint (_("template parameter missing "
10831 "DW_AT_const_value"));
10832 buf.puts ("UNKNOWN_VALUE");
10836 dwarf2_const_value_attr (attr, type, name,
10837 &cu->comp_unit_obstack, cu,
10838 &value, &bytes, &baton);
10840 if (TYPE_NOSIGN (type))
10841 /* GDB prints characters as NUMBER 'CHAR'. If that's
10842 changed, this can use value_print instead. */
10843 c_printchar (value, type, &buf);
10846 struct value_print_options opts;
10849 v = dwarf2_evaluate_loc_desc (type, NULL,
10853 else if (bytes != NULL)
10855 v = allocate_value (type);
10856 memcpy (value_contents_writeable (v), bytes,
10857 TYPE_LENGTH (type));
10860 v = value_from_longest (type, value);
10862 /* Specify decimal so that we do not depend on
10864 get_formatted_print_options (&opts, 'd');
10866 value_print (v, &buf, &opts);
10871 die->building_fullname = 0;
10875 /* Close the argument list, with a space if necessary
10876 (nested templates). */
10877 if (!buf.empty () && buf.string ().back () == '>')
10884 /* For C++ methods, append formal parameter type
10885 information, if PHYSNAME. */
10887 if (physname && die->tag == DW_TAG_subprogram
10888 && cu->language == language_cplus)
10890 struct type *type = read_type_die (die, cu);
10892 c_type_print_args (type, &buf, 1, cu->language,
10893 &type_print_raw_options);
10895 if (cu->language == language_cplus)
10897 /* Assume that an artificial first parameter is
10898 "this", but do not crash if it is not. RealView
10899 marks unnamed (and thus unused) parameters as
10900 artificial; there is no way to differentiate
10902 if (TYPE_NFIELDS (type) > 0
10903 && TYPE_FIELD_ARTIFICIAL (type, 0)
10904 && TYPE_CODE (TYPE_FIELD_TYPE (type, 0)) == TYPE_CODE_PTR
10905 && TYPE_CONST (TYPE_TARGET_TYPE (TYPE_FIELD_TYPE (type,
10907 buf.puts (" const");
10911 const std::string &intermediate_name = buf.string ();
10913 if (cu->language == language_cplus)
10915 = dwarf2_canonicalize_name (intermediate_name.c_str (), cu,
10916 &objfile->per_bfd->storage_obstack);
10918 /* If we only computed INTERMEDIATE_NAME, or if
10919 INTERMEDIATE_NAME is already canonical, then we need to
10920 copy it to the appropriate obstack. */
10921 if (canonical_name == NULL || canonical_name == intermediate_name.c_str ())
10922 name = ((const char *)
10923 obstack_copy0 (&objfile->per_bfd->storage_obstack,
10924 intermediate_name.c_str (),
10925 intermediate_name.length ()));
10927 name = canonical_name;
10934 /* Return the fully qualified name of DIE, based on its DW_AT_name.
10935 If scope qualifiers are appropriate they will be added. The result
10936 will be allocated on the storage_obstack, or NULL if the DIE does
10937 not have a name. NAME may either be from a previous call to
10938 dwarf2_name or NULL.
10940 The output string will be canonicalized (if C++). */
10942 static const char *
10943 dwarf2_full_name (const char *name, struct die_info *die, struct dwarf2_cu *cu)
10945 return dwarf2_compute_name (name, die, cu, 0);
10948 /* Construct a physname for the given DIE in CU. NAME may either be
10949 from a previous call to dwarf2_name or NULL. The result will be
10950 allocated on the objfile_objstack or NULL if the DIE does not have a
10953 The output string will be canonicalized (if C++). */
10955 static const char *
10956 dwarf2_physname (const char *name, struct die_info *die, struct dwarf2_cu *cu)
10958 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
10959 const char *retval, *mangled = NULL, *canon = NULL;
10962 /* In this case dwarf2_compute_name is just a shortcut not building anything
10964 if (!die_needs_namespace (die, cu))
10965 return dwarf2_compute_name (name, die, cu, 1);
10967 mangled = dw2_linkage_name (die, cu);
10969 /* rustc emits invalid values for DW_AT_linkage_name. Ignore these.
10970 See https://github.com/rust-lang/rust/issues/32925. */
10971 if (cu->language == language_rust && mangled != NULL
10972 && strchr (mangled, '{') != NULL)
10975 /* DW_AT_linkage_name is missing in some cases - depend on what GDB
10977 gdb::unique_xmalloc_ptr<char> demangled;
10978 if (mangled != NULL)
10981 if (language_def (cu->language)->la_store_sym_names_in_linkage_form_p)
10983 /* Do nothing (do not demangle the symbol name). */
10985 else if (cu->language == language_go)
10987 /* This is a lie, but we already lie to the caller new_symbol.
10988 new_symbol assumes we return the mangled name.
10989 This just undoes that lie until things are cleaned up. */
10993 /* Use DMGL_RET_DROP for C++ template functions to suppress
10994 their return type. It is easier for GDB users to search
10995 for such functions as `name(params)' than `long name(params)'.
10996 In such case the minimal symbol names do not match the full
10997 symbol names but for template functions there is never a need
10998 to look up their definition from their declaration so
10999 the only disadvantage remains the minimal symbol variant
11000 `long name(params)' does not have the proper inferior type. */
11001 demangled.reset (gdb_demangle (mangled,
11002 (DMGL_PARAMS | DMGL_ANSI
11003 | DMGL_RET_DROP)));
11006 canon = demangled.get ();
11014 if (canon == NULL || check_physname)
11016 const char *physname = dwarf2_compute_name (name, die, cu, 1);
11018 if (canon != NULL && strcmp (physname, canon) != 0)
11020 /* It may not mean a bug in GDB. The compiler could also
11021 compute DW_AT_linkage_name incorrectly. But in such case
11022 GDB would need to be bug-to-bug compatible. */
11024 complaint (_("Computed physname <%s> does not match demangled <%s> "
11025 "(from linkage <%s>) - DIE at %s [in module %s]"),
11026 physname, canon, mangled, sect_offset_str (die->sect_off),
11027 objfile_name (objfile));
11029 /* Prefer DW_AT_linkage_name (in the CANON form) - when it
11030 is available here - over computed PHYSNAME. It is safer
11031 against both buggy GDB and buggy compilers. */
11045 retval = ((const char *)
11046 obstack_copy0 (&objfile->per_bfd->storage_obstack,
11047 retval, strlen (retval)));
11052 /* Inspect DIE in CU for a namespace alias. If one exists, record
11053 a new symbol for it.
11055 Returns 1 if a namespace alias was recorded, 0 otherwise. */
11058 read_namespace_alias (struct die_info *die, struct dwarf2_cu *cu)
11060 struct attribute *attr;
11062 /* If the die does not have a name, this is not a namespace
11064 attr = dwarf2_attr (die, DW_AT_name, cu);
11068 struct die_info *d = die;
11069 struct dwarf2_cu *imported_cu = cu;
11071 /* If the compiler has nested DW_AT_imported_declaration DIEs,
11072 keep inspecting DIEs until we hit the underlying import. */
11073 #define MAX_NESTED_IMPORTED_DECLARATIONS 100
11074 for (num = 0; num < MAX_NESTED_IMPORTED_DECLARATIONS; ++num)
11076 attr = dwarf2_attr (d, DW_AT_import, cu);
11080 d = follow_die_ref (d, attr, &imported_cu);
11081 if (d->tag != DW_TAG_imported_declaration)
11085 if (num == MAX_NESTED_IMPORTED_DECLARATIONS)
11087 complaint (_("DIE at %s has too many recursively imported "
11088 "declarations"), sect_offset_str (d->sect_off));
11095 sect_offset sect_off = dwarf2_get_ref_die_offset (attr);
11097 type = get_die_type_at_offset (sect_off, cu->per_cu);
11098 if (type != NULL && TYPE_CODE (type) == TYPE_CODE_NAMESPACE)
11100 /* This declaration is a global namespace alias. Add
11101 a symbol for it whose type is the aliased namespace. */
11102 new_symbol (die, type, cu);
11111 /* Return the using directives repository (global or local?) to use in the
11112 current context for LANGUAGE.
11114 For Ada, imported declarations can materialize renamings, which *may* be
11115 global. However it is impossible (for now?) in DWARF to distinguish
11116 "external" imported declarations and "static" ones. As all imported
11117 declarations seem to be static in all other languages, make them all CU-wide
11118 global only in Ada. */
11120 static struct using_direct **
11121 using_directives (enum language language)
11123 if (language == language_ada && context_stack_depth == 0)
11124 return &global_using_directives;
11126 return &local_using_directives;
11129 /* Read the import statement specified by the given die and record it. */
11132 read_import_statement (struct die_info *die, struct dwarf2_cu *cu)
11134 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
11135 struct attribute *import_attr;
11136 struct die_info *imported_die, *child_die;
11137 struct dwarf2_cu *imported_cu;
11138 const char *imported_name;
11139 const char *imported_name_prefix;
11140 const char *canonical_name;
11141 const char *import_alias;
11142 const char *imported_declaration = NULL;
11143 const char *import_prefix;
11144 std::vector<const char *> excludes;
11146 import_attr = dwarf2_attr (die, DW_AT_import, cu);
11147 if (import_attr == NULL)
11149 complaint (_("Tag '%s' has no DW_AT_import"),
11150 dwarf_tag_name (die->tag));
11155 imported_die = follow_die_ref_or_sig (die, import_attr, &imported_cu);
11156 imported_name = dwarf2_name (imported_die, imported_cu);
11157 if (imported_name == NULL)
11159 /* GCC bug: https://bugzilla.redhat.com/show_bug.cgi?id=506524
11161 The import in the following code:
11175 <2><51>: Abbrev Number: 3 (DW_TAG_imported_declaration)
11176 <52> DW_AT_decl_file : 1
11177 <53> DW_AT_decl_line : 6
11178 <54> DW_AT_import : <0x75>
11179 <2><58>: Abbrev Number: 4 (DW_TAG_typedef)
11180 <59> DW_AT_name : B
11181 <5b> DW_AT_decl_file : 1
11182 <5c> DW_AT_decl_line : 2
11183 <5d> DW_AT_type : <0x6e>
11185 <1><75>: Abbrev Number: 7 (DW_TAG_base_type)
11186 <76> DW_AT_byte_size : 4
11187 <77> DW_AT_encoding : 5 (signed)
11189 imports the wrong die ( 0x75 instead of 0x58 ).
11190 This case will be ignored until the gcc bug is fixed. */
11194 /* Figure out the local name after import. */
11195 import_alias = dwarf2_name (die, cu);
11197 /* Figure out where the statement is being imported to. */
11198 import_prefix = determine_prefix (die, cu);
11200 /* Figure out what the scope of the imported die is and prepend it
11201 to the name of the imported die. */
11202 imported_name_prefix = determine_prefix (imported_die, imported_cu);
11204 if (imported_die->tag != DW_TAG_namespace
11205 && imported_die->tag != DW_TAG_module)
11207 imported_declaration = imported_name;
11208 canonical_name = imported_name_prefix;
11210 else if (strlen (imported_name_prefix) > 0)
11211 canonical_name = obconcat (&objfile->objfile_obstack,
11212 imported_name_prefix,
11213 (cu->language == language_d ? "." : "::"),
11214 imported_name, (char *) NULL);
11216 canonical_name = imported_name;
11218 if (die->tag == DW_TAG_imported_module && cu->language == language_fortran)
11219 for (child_die = die->child; child_die && child_die->tag;
11220 child_die = sibling_die (child_die))
11222 /* DWARF-4: A Fortran use statement with a “rename list” may be
11223 represented by an imported module entry with an import attribute
11224 referring to the module and owned entries corresponding to those
11225 entities that are renamed as part of being imported. */
11227 if (child_die->tag != DW_TAG_imported_declaration)
11229 complaint (_("child DW_TAG_imported_declaration expected "
11230 "- DIE at %s [in module %s]"),
11231 sect_offset_str (child_die->sect_off),
11232 objfile_name (objfile));
11236 import_attr = dwarf2_attr (child_die, DW_AT_import, cu);
11237 if (import_attr == NULL)
11239 complaint (_("Tag '%s' has no DW_AT_import"),
11240 dwarf_tag_name (child_die->tag));
11245 imported_die = follow_die_ref_or_sig (child_die, import_attr,
11247 imported_name = dwarf2_name (imported_die, imported_cu);
11248 if (imported_name == NULL)
11250 complaint (_("child DW_TAG_imported_declaration has unknown "
11251 "imported name - DIE at %s [in module %s]"),
11252 sect_offset_str (child_die->sect_off),
11253 objfile_name (objfile));
11257 excludes.push_back (imported_name);
11259 process_die (child_die, cu);
11262 add_using_directive (using_directives (cu->language),
11266 imported_declaration,
11269 &objfile->objfile_obstack);
11272 /* ICC<14 does not output the required DW_AT_declaration on incomplete
11273 types, but gives them a size of zero. Starting with version 14,
11274 ICC is compatible with GCC. */
11277 producer_is_icc_lt_14 (struct dwarf2_cu *cu)
11279 if (!cu->checked_producer)
11280 check_producer (cu);
11282 return cu->producer_is_icc_lt_14;
11285 /* Check for possibly missing DW_AT_comp_dir with relative .debug_line
11286 directory paths. GCC SVN r127613 (new option -fdebug-prefix-map) fixed
11287 this, it was first present in GCC release 4.3.0. */
11290 producer_is_gcc_lt_4_3 (struct dwarf2_cu *cu)
11292 if (!cu->checked_producer)
11293 check_producer (cu);
11295 return cu->producer_is_gcc_lt_4_3;
11298 static file_and_directory
11299 find_file_and_directory (struct die_info *die, struct dwarf2_cu *cu)
11301 file_and_directory res;
11303 /* Find the filename. Do not use dwarf2_name here, since the filename
11304 is not a source language identifier. */
11305 res.name = dwarf2_string_attr (die, DW_AT_name, cu);
11306 res.comp_dir = dwarf2_string_attr (die, DW_AT_comp_dir, cu);
11308 if (res.comp_dir == NULL
11309 && producer_is_gcc_lt_4_3 (cu) && res.name != NULL
11310 && IS_ABSOLUTE_PATH (res.name))
11312 res.comp_dir_storage = ldirname (res.name);
11313 if (!res.comp_dir_storage.empty ())
11314 res.comp_dir = res.comp_dir_storage.c_str ();
11316 if (res.comp_dir != NULL)
11318 /* Irix 6.2 native cc prepends <machine>.: to the compilation
11319 directory, get rid of it. */
11320 const char *cp = strchr (res.comp_dir, ':');
11322 if (cp && cp != res.comp_dir && cp[-1] == '.' && cp[1] == '/')
11323 res.comp_dir = cp + 1;
11326 if (res.name == NULL)
11327 res.name = "<unknown>";
11332 /* Handle DW_AT_stmt_list for a compilation unit.
11333 DIE is the DW_TAG_compile_unit die for CU.
11334 COMP_DIR is the compilation directory. LOWPC is passed to
11335 dwarf_decode_lines. See dwarf_decode_lines comments about it. */
11338 handle_DW_AT_stmt_list (struct die_info *die, struct dwarf2_cu *cu,
11339 const char *comp_dir, CORE_ADDR lowpc) /* ARI: editCase function */
11341 struct dwarf2_per_objfile *dwarf2_per_objfile
11342 = cu->per_cu->dwarf2_per_objfile;
11343 struct objfile *objfile = dwarf2_per_objfile->objfile;
11344 struct attribute *attr;
11345 struct line_header line_header_local;
11346 hashval_t line_header_local_hash;
11348 int decode_mapping;
11350 gdb_assert (! cu->per_cu->is_debug_types);
11352 attr = dwarf2_attr (die, DW_AT_stmt_list, cu);
11356 sect_offset line_offset = (sect_offset) DW_UNSND (attr);
11358 /* The line header hash table is only created if needed (it exists to
11359 prevent redundant reading of the line table for partial_units).
11360 If we're given a partial_unit, we'll need it. If we're given a
11361 compile_unit, then use the line header hash table if it's already
11362 created, but don't create one just yet. */
11364 if (dwarf2_per_objfile->line_header_hash == NULL
11365 && die->tag == DW_TAG_partial_unit)
11367 dwarf2_per_objfile->line_header_hash
11368 = htab_create_alloc_ex (127, line_header_hash_voidp,
11369 line_header_eq_voidp,
11370 free_line_header_voidp,
11371 &objfile->objfile_obstack,
11372 hashtab_obstack_allocate,
11373 dummy_obstack_deallocate);
11376 line_header_local.sect_off = line_offset;
11377 line_header_local.offset_in_dwz = cu->per_cu->is_dwz;
11378 line_header_local_hash = line_header_hash (&line_header_local);
11379 if (dwarf2_per_objfile->line_header_hash != NULL)
11381 slot = htab_find_slot_with_hash (dwarf2_per_objfile->line_header_hash,
11382 &line_header_local,
11383 line_header_local_hash, NO_INSERT);
11385 /* For DW_TAG_compile_unit we need info like symtab::linetable which
11386 is not present in *SLOT (since if there is something in *SLOT then
11387 it will be for a partial_unit). */
11388 if (die->tag == DW_TAG_partial_unit && slot != NULL)
11390 gdb_assert (*slot != NULL);
11391 cu->line_header = (struct line_header *) *slot;
11396 /* dwarf_decode_line_header does not yet provide sufficient information.
11397 We always have to call also dwarf_decode_lines for it. */
11398 line_header_up lh = dwarf_decode_line_header (line_offset, cu);
11402 cu->line_header = lh.release ();
11403 cu->line_header_die_owner = die;
11405 if (dwarf2_per_objfile->line_header_hash == NULL)
11409 slot = htab_find_slot_with_hash (dwarf2_per_objfile->line_header_hash,
11410 &line_header_local,
11411 line_header_local_hash, INSERT);
11412 gdb_assert (slot != NULL);
11414 if (slot != NULL && *slot == NULL)
11416 /* This newly decoded line number information unit will be owned
11417 by line_header_hash hash table. */
11418 *slot = cu->line_header;
11419 cu->line_header_die_owner = NULL;
11423 /* We cannot free any current entry in (*slot) as that struct line_header
11424 may be already used by multiple CUs. Create only temporary decoded
11425 line_header for this CU - it may happen at most once for each line
11426 number information unit. And if we're not using line_header_hash
11427 then this is what we want as well. */
11428 gdb_assert (die->tag != DW_TAG_partial_unit);
11430 decode_mapping = (die->tag != DW_TAG_partial_unit);
11431 dwarf_decode_lines (cu->line_header, comp_dir, cu, NULL, lowpc,
11436 /* Process DW_TAG_compile_unit or DW_TAG_partial_unit. */
11439 read_file_scope (struct die_info *die, struct dwarf2_cu *cu)
11441 struct dwarf2_per_objfile *dwarf2_per_objfile
11442 = cu->per_cu->dwarf2_per_objfile;
11443 struct objfile *objfile = dwarf2_per_objfile->objfile;
11444 struct gdbarch *gdbarch = get_objfile_arch (objfile);
11445 CORE_ADDR lowpc = ((CORE_ADDR) -1);
11446 CORE_ADDR highpc = ((CORE_ADDR) 0);
11447 struct attribute *attr;
11448 struct die_info *child_die;
11449 CORE_ADDR baseaddr;
11451 prepare_one_comp_unit (cu, die, cu->language);
11452 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
11454 get_scope_pc_bounds (die, &lowpc, &highpc, cu);
11456 /* If we didn't find a lowpc, set it to highpc to avoid complaints
11457 from finish_block. */
11458 if (lowpc == ((CORE_ADDR) -1))
11460 lowpc = gdbarch_adjust_dwarf2_addr (gdbarch, lowpc + baseaddr);
11462 file_and_directory fnd = find_file_and_directory (die, cu);
11464 /* The XLCL doesn't generate DW_LANG_OpenCL because this attribute is not
11465 standardised yet. As a workaround for the language detection we fall
11466 back to the DW_AT_producer string. */
11467 if (cu->producer && strstr (cu->producer, "IBM XL C for OpenCL") != NULL)
11468 cu->language = language_opencl;
11470 /* Similar hack for Go. */
11471 if (cu->producer && strstr (cu->producer, "GNU Go ") != NULL)
11472 set_cu_language (DW_LANG_Go, cu);
11474 dwarf2_start_symtab (cu, fnd.name, fnd.comp_dir, lowpc);
11476 /* Decode line number information if present. We do this before
11477 processing child DIEs, so that the line header table is available
11478 for DW_AT_decl_file. */
11479 handle_DW_AT_stmt_list (die, cu, fnd.comp_dir, lowpc);
11481 /* Process all dies in compilation unit. */
11482 if (die->child != NULL)
11484 child_die = die->child;
11485 while (child_die && child_die->tag)
11487 process_die (child_die, cu);
11488 child_die = sibling_die (child_die);
11492 /* Decode macro information, if present. Dwarf 2 macro information
11493 refers to information in the line number info statement program
11494 header, so we can only read it if we've read the header
11496 attr = dwarf2_attr (die, DW_AT_macros, cu);
11498 attr = dwarf2_attr (die, DW_AT_GNU_macros, cu);
11499 if (attr && cu->line_header)
11501 if (dwarf2_attr (die, DW_AT_macro_info, cu))
11502 complaint (_("CU refers to both DW_AT_macros and DW_AT_macro_info"));
11504 dwarf_decode_macros (cu, DW_UNSND (attr), 1);
11508 attr = dwarf2_attr (die, DW_AT_macro_info, cu);
11509 if (attr && cu->line_header)
11511 unsigned int macro_offset = DW_UNSND (attr);
11513 dwarf_decode_macros (cu, macro_offset, 0);
11518 /* TU version of handle_DW_AT_stmt_list for read_type_unit_scope.
11519 Create the set of symtabs used by this TU, or if this TU is sharing
11520 symtabs with another TU and the symtabs have already been created
11521 then restore those symtabs in the line header.
11522 We don't need the pc/line-number mapping for type units. */
11525 setup_type_unit_groups (struct die_info *die, struct dwarf2_cu *cu)
11527 struct dwarf2_per_cu_data *per_cu = cu->per_cu;
11528 struct type_unit_group *tu_group;
11530 struct attribute *attr;
11532 struct signatured_type *sig_type;
11534 gdb_assert (per_cu->is_debug_types);
11535 sig_type = (struct signatured_type *) per_cu;
11537 attr = dwarf2_attr (die, DW_AT_stmt_list, cu);
11539 /* If we're using .gdb_index (includes -readnow) then
11540 per_cu->type_unit_group may not have been set up yet. */
11541 if (sig_type->type_unit_group == NULL)
11542 sig_type->type_unit_group = get_type_unit_group (cu, attr);
11543 tu_group = sig_type->type_unit_group;
11545 /* If we've already processed this stmt_list there's no real need to
11546 do it again, we could fake it and just recreate the part we need
11547 (file name,index -> symtab mapping). If data shows this optimization
11548 is useful we can do it then. */
11549 first_time = tu_group->compunit_symtab == NULL;
11551 /* We have to handle the case of both a missing DW_AT_stmt_list or bad
11556 sect_offset line_offset = (sect_offset) DW_UNSND (attr);
11557 lh = dwarf_decode_line_header (line_offset, cu);
11562 dwarf2_start_symtab (cu, "", NULL, 0);
11565 gdb_assert (tu_group->symtabs == NULL);
11566 restart_symtab (tu_group->compunit_symtab, "", 0);
11571 cu->line_header = lh.release ();
11572 cu->line_header_die_owner = die;
11576 struct compunit_symtab *cust = dwarf2_start_symtab (cu, "", NULL, 0);
11578 /* Note: We don't assign tu_group->compunit_symtab yet because we're
11579 still initializing it, and our caller (a few levels up)
11580 process_full_type_unit still needs to know if this is the first
11583 tu_group->num_symtabs = cu->line_header->file_names.size ();
11584 tu_group->symtabs = XNEWVEC (struct symtab *,
11585 cu->line_header->file_names.size ());
11587 for (i = 0; i < cu->line_header->file_names.size (); ++i)
11589 file_entry &fe = cu->line_header->file_names[i];
11591 dwarf2_start_subfile (fe.name, fe.include_dir (cu->line_header));
11593 if (current_subfile->symtab == NULL)
11595 /* NOTE: start_subfile will recognize when it's been
11596 passed a file it has already seen. So we can't
11597 assume there's a simple mapping from
11598 cu->line_header->file_names to subfiles, plus
11599 cu->line_header->file_names may contain dups. */
11600 current_subfile->symtab
11601 = allocate_symtab (cust, current_subfile->name);
11604 fe.symtab = current_subfile->symtab;
11605 tu_group->symtabs[i] = fe.symtab;
11610 restart_symtab (tu_group->compunit_symtab, "", 0);
11612 for (i = 0; i < cu->line_header->file_names.size (); ++i)
11614 file_entry &fe = cu->line_header->file_names[i];
11616 fe.symtab = tu_group->symtabs[i];
11620 /* The main symtab is allocated last. Type units don't have DW_AT_name
11621 so they don't have a "real" (so to speak) symtab anyway.
11622 There is later code that will assign the main symtab to all symbols
11623 that don't have one. We need to handle the case of a symbol with a
11624 missing symtab (DW_AT_decl_file) anyway. */
11627 /* Process DW_TAG_type_unit.
11628 For TUs we want to skip the first top level sibling if it's not the
11629 actual type being defined by this TU. In this case the first top
11630 level sibling is there to provide context only. */
11633 read_type_unit_scope (struct die_info *die, struct dwarf2_cu *cu)
11635 struct die_info *child_die;
11637 prepare_one_comp_unit (cu, die, language_minimal);
11639 /* Initialize (or reinitialize) the machinery for building symtabs.
11640 We do this before processing child DIEs, so that the line header table
11641 is available for DW_AT_decl_file. */
11642 setup_type_unit_groups (die, cu);
11644 if (die->child != NULL)
11646 child_die = die->child;
11647 while (child_die && child_die->tag)
11649 process_die (child_die, cu);
11650 child_die = sibling_die (child_die);
11657 http://gcc.gnu.org/wiki/DebugFission
11658 http://gcc.gnu.org/wiki/DebugFissionDWP
11660 To simplify handling of both DWO files ("object" files with the DWARF info)
11661 and DWP files (a file with the DWOs packaged up into one file), we treat
11662 DWP files as having a collection of virtual DWO files. */
11665 hash_dwo_file (const void *item)
11667 const struct dwo_file *dwo_file = (const struct dwo_file *) item;
11670 hash = htab_hash_string (dwo_file->dwo_name);
11671 if (dwo_file->comp_dir != NULL)
11672 hash += htab_hash_string (dwo_file->comp_dir);
11677 eq_dwo_file (const void *item_lhs, const void *item_rhs)
11679 const struct dwo_file *lhs = (const struct dwo_file *) item_lhs;
11680 const struct dwo_file *rhs = (const struct dwo_file *) item_rhs;
11682 if (strcmp (lhs->dwo_name, rhs->dwo_name) != 0)
11684 if (lhs->comp_dir == NULL || rhs->comp_dir == NULL)
11685 return lhs->comp_dir == rhs->comp_dir;
11686 return strcmp (lhs->comp_dir, rhs->comp_dir) == 0;
11689 /* Allocate a hash table for DWO files. */
11692 allocate_dwo_file_hash_table (struct objfile *objfile)
11694 return htab_create_alloc_ex (41,
11698 &objfile->objfile_obstack,
11699 hashtab_obstack_allocate,
11700 dummy_obstack_deallocate);
11703 /* Lookup DWO file DWO_NAME. */
11706 lookup_dwo_file_slot (struct dwarf2_per_objfile *dwarf2_per_objfile,
11707 const char *dwo_name,
11708 const char *comp_dir)
11710 struct dwo_file find_entry;
11713 if (dwarf2_per_objfile->dwo_files == NULL)
11714 dwarf2_per_objfile->dwo_files
11715 = allocate_dwo_file_hash_table (dwarf2_per_objfile->objfile);
11717 memset (&find_entry, 0, sizeof (find_entry));
11718 find_entry.dwo_name = dwo_name;
11719 find_entry.comp_dir = comp_dir;
11720 slot = htab_find_slot (dwarf2_per_objfile->dwo_files, &find_entry, INSERT);
11726 hash_dwo_unit (const void *item)
11728 const struct dwo_unit *dwo_unit = (const struct dwo_unit *) item;
11730 /* This drops the top 32 bits of the id, but is ok for a hash. */
11731 return dwo_unit->signature;
11735 eq_dwo_unit (const void *item_lhs, const void *item_rhs)
11737 const struct dwo_unit *lhs = (const struct dwo_unit *) item_lhs;
11738 const struct dwo_unit *rhs = (const struct dwo_unit *) item_rhs;
11740 /* The signature is assumed to be unique within the DWO file.
11741 So while object file CU dwo_id's always have the value zero,
11742 that's OK, assuming each object file DWO file has only one CU,
11743 and that's the rule for now. */
11744 return lhs->signature == rhs->signature;
11747 /* Allocate a hash table for DWO CUs,TUs.
11748 There is one of these tables for each of CUs,TUs for each DWO file. */
11751 allocate_dwo_unit_table (struct objfile *objfile)
11753 /* Start out with a pretty small number.
11754 Generally DWO files contain only one CU and maybe some TUs. */
11755 return htab_create_alloc_ex (3,
11759 &objfile->objfile_obstack,
11760 hashtab_obstack_allocate,
11761 dummy_obstack_deallocate);
11764 /* Structure used to pass data to create_dwo_debug_info_hash_table_reader. */
11766 struct create_dwo_cu_data
11768 struct dwo_file *dwo_file;
11769 struct dwo_unit dwo_unit;
11772 /* die_reader_func for create_dwo_cu. */
11775 create_dwo_cu_reader (const struct die_reader_specs *reader,
11776 const gdb_byte *info_ptr,
11777 struct die_info *comp_unit_die,
11781 struct dwarf2_cu *cu = reader->cu;
11782 sect_offset sect_off = cu->per_cu->sect_off;
11783 struct dwarf2_section_info *section = cu->per_cu->section;
11784 struct create_dwo_cu_data *data = (struct create_dwo_cu_data *) datap;
11785 struct dwo_file *dwo_file = data->dwo_file;
11786 struct dwo_unit *dwo_unit = &data->dwo_unit;
11787 struct attribute *attr;
11789 attr = dwarf2_attr (comp_unit_die, DW_AT_GNU_dwo_id, cu);
11792 complaint (_("Dwarf Error: debug entry at offset %s is missing"
11793 " its dwo_id [in module %s]"),
11794 sect_offset_str (sect_off), dwo_file->dwo_name);
11798 dwo_unit->dwo_file = dwo_file;
11799 dwo_unit->signature = DW_UNSND (attr);
11800 dwo_unit->section = section;
11801 dwo_unit->sect_off = sect_off;
11802 dwo_unit->length = cu->per_cu->length;
11804 if (dwarf_read_debug)
11805 fprintf_unfiltered (gdb_stdlog, " offset %s, dwo_id %s\n",
11806 sect_offset_str (sect_off),
11807 hex_string (dwo_unit->signature));
11810 /* Create the dwo_units for the CUs in a DWO_FILE.
11811 Note: This function processes DWO files only, not DWP files. */
11814 create_cus_hash_table (struct dwarf2_per_objfile *dwarf2_per_objfile,
11815 struct dwo_file &dwo_file, dwarf2_section_info §ion,
11818 struct objfile *objfile = dwarf2_per_objfile->objfile;
11819 const gdb_byte *info_ptr, *end_ptr;
11821 dwarf2_read_section (objfile, §ion);
11822 info_ptr = section.buffer;
11824 if (info_ptr == NULL)
11827 if (dwarf_read_debug)
11829 fprintf_unfiltered (gdb_stdlog, "Reading %s for %s:\n",
11830 get_section_name (§ion),
11831 get_section_file_name (§ion));
11834 end_ptr = info_ptr + section.size;
11835 while (info_ptr < end_ptr)
11837 struct dwarf2_per_cu_data per_cu;
11838 struct create_dwo_cu_data create_dwo_cu_data;
11839 struct dwo_unit *dwo_unit;
11841 sect_offset sect_off = (sect_offset) (info_ptr - section.buffer);
11843 memset (&create_dwo_cu_data.dwo_unit, 0,
11844 sizeof (create_dwo_cu_data.dwo_unit));
11845 memset (&per_cu, 0, sizeof (per_cu));
11846 per_cu.dwarf2_per_objfile = dwarf2_per_objfile;
11847 per_cu.is_debug_types = 0;
11848 per_cu.sect_off = sect_offset (info_ptr - section.buffer);
11849 per_cu.section = §ion;
11850 create_dwo_cu_data.dwo_file = &dwo_file;
11852 init_cutu_and_read_dies_no_follow (
11853 &per_cu, &dwo_file, create_dwo_cu_reader, &create_dwo_cu_data);
11854 info_ptr += per_cu.length;
11856 // If the unit could not be parsed, skip it.
11857 if (create_dwo_cu_data.dwo_unit.dwo_file == NULL)
11860 if (cus_htab == NULL)
11861 cus_htab = allocate_dwo_unit_table (objfile);
11863 dwo_unit = OBSTACK_ZALLOC (&objfile->objfile_obstack, struct dwo_unit);
11864 *dwo_unit = create_dwo_cu_data.dwo_unit;
11865 slot = htab_find_slot (cus_htab, dwo_unit, INSERT);
11866 gdb_assert (slot != NULL);
11869 const struct dwo_unit *dup_cu = (const struct dwo_unit *)*slot;
11870 sect_offset dup_sect_off = dup_cu->sect_off;
11872 complaint (_("debug cu entry at offset %s is duplicate to"
11873 " the entry at offset %s, signature %s"),
11874 sect_offset_str (sect_off), sect_offset_str (dup_sect_off),
11875 hex_string (dwo_unit->signature));
11877 *slot = (void *)dwo_unit;
11881 /* DWP file .debug_{cu,tu}_index section format:
11882 [ref: http://gcc.gnu.org/wiki/DebugFissionDWP]
11886 Both index sections have the same format, and serve to map a 64-bit
11887 signature to a set of section numbers. Each section begins with a header,
11888 followed by a hash table of 64-bit signatures, a parallel table of 32-bit
11889 indexes, and a pool of 32-bit section numbers. The index sections will be
11890 aligned at 8-byte boundaries in the file.
11892 The index section header consists of:
11894 V, 32 bit version number
11896 N, 32 bit number of compilation units or type units in the index
11897 M, 32 bit number of slots in the hash table
11899 Numbers are recorded using the byte order of the application binary.
11901 The hash table begins at offset 16 in the section, and consists of an array
11902 of M 64-bit slots. Each slot contains a 64-bit signature (using the byte
11903 order of the application binary). Unused slots in the hash table are 0.
11904 (We rely on the extreme unlikeliness of a signature being exactly 0.)
11906 The parallel table begins immediately after the hash table
11907 (at offset 16 + 8 * M from the beginning of the section), and consists of an
11908 array of 32-bit indexes (using the byte order of the application binary),
11909 corresponding 1-1 with slots in the hash table. Each entry in the parallel
11910 table contains a 32-bit index into the pool of section numbers. For unused
11911 hash table slots, the corresponding entry in the parallel table will be 0.
11913 The pool of section numbers begins immediately following the hash table
11914 (at offset 16 + 12 * M from the beginning of the section). The pool of
11915 section numbers consists of an array of 32-bit words (using the byte order
11916 of the application binary). Each item in the array is indexed starting
11917 from 0. The hash table entry provides the index of the first section
11918 number in the set. Additional section numbers in the set follow, and the
11919 set is terminated by a 0 entry (section number 0 is not used in ELF).
11921 In each set of section numbers, the .debug_info.dwo or .debug_types.dwo
11922 section must be the first entry in the set, and the .debug_abbrev.dwo must
11923 be the second entry. Other members of the set may follow in any order.
11929 DWP Version 2 combines all the .debug_info, etc. sections into one,
11930 and the entries in the index tables are now offsets into these sections.
11931 CU offsets begin at 0. TU offsets begin at the size of the .debug_info
11934 Index Section Contents:
11936 Hash Table of Signatures dwp_hash_table.hash_table
11937 Parallel Table of Indices dwp_hash_table.unit_table
11938 Table of Section Offsets dwp_hash_table.v2.{section_ids,offsets}
11939 Table of Section Sizes dwp_hash_table.v2.sizes
11941 The index section header consists of:
11943 V, 32 bit version number
11944 L, 32 bit number of columns in the table of section offsets
11945 N, 32 bit number of compilation units or type units in the index
11946 M, 32 bit number of slots in the hash table
11948 Numbers are recorded using the byte order of the application binary.
11950 The hash table has the same format as version 1.
11951 The parallel table of indices has the same format as version 1,
11952 except that the entries are origin-1 indices into the table of sections
11953 offsets and the table of section sizes.
11955 The table of offsets begins immediately following the parallel table
11956 (at offset 16 + 12 * M from the beginning of the section). The table is
11957 a two-dimensional array of 32-bit words (using the byte order of the
11958 application binary), with L columns and N+1 rows, in row-major order.
11959 Each row in the array is indexed starting from 0. The first row provides
11960 a key to the remaining rows: each column in this row provides an identifier
11961 for a debug section, and the offsets in the same column of subsequent rows
11962 refer to that section. The section identifiers are:
11964 DW_SECT_INFO 1 .debug_info.dwo
11965 DW_SECT_TYPES 2 .debug_types.dwo
11966 DW_SECT_ABBREV 3 .debug_abbrev.dwo
11967 DW_SECT_LINE 4 .debug_line.dwo
11968 DW_SECT_LOC 5 .debug_loc.dwo
11969 DW_SECT_STR_OFFSETS 6 .debug_str_offsets.dwo
11970 DW_SECT_MACINFO 7 .debug_macinfo.dwo
11971 DW_SECT_MACRO 8 .debug_macro.dwo
11973 The offsets provided by the CU and TU index sections are the base offsets
11974 for the contributions made by each CU or TU to the corresponding section
11975 in the package file. Each CU and TU header contains an abbrev_offset
11976 field, used to find the abbreviations table for that CU or TU within the
11977 contribution to the .debug_abbrev.dwo section for that CU or TU, and should
11978 be interpreted as relative to the base offset given in the index section.
11979 Likewise, offsets into .debug_line.dwo from DW_AT_stmt_list attributes
11980 should be interpreted as relative to the base offset for .debug_line.dwo,
11981 and offsets into other debug sections obtained from DWARF attributes should
11982 also be interpreted as relative to the corresponding base offset.
11984 The table of sizes begins immediately following the table of offsets.
11985 Like the table of offsets, it is a two-dimensional array of 32-bit words,
11986 with L columns and N rows, in row-major order. Each row in the array is
11987 indexed starting from 1 (row 0 is shared by the two tables).
11991 Hash table lookup is handled the same in version 1 and 2:
11993 We assume that N and M will not exceed 2^32 - 1.
11994 The size of the hash table, M, must be 2^k such that 2^k > 3*N/2.
11996 Given a 64-bit compilation unit signature or a type signature S, an entry
11997 in the hash table is located as follows:
11999 1) Calculate a primary hash H = S & MASK(k), where MASK(k) is a mask with
12000 the low-order k bits all set to 1.
12002 2) Calculate a secondary hash H' = (((S >> 32) & MASK(k)) | 1).
12004 3) If the hash table entry at index H matches the signature, use that
12005 entry. If the hash table entry at index H is unused (all zeroes),
12006 terminate the search: the signature is not present in the table.
12008 4) Let H = (H + H') modulo M. Repeat at Step 3.
12010 Because M > N and H' and M are relatively prime, the search is guaranteed
12011 to stop at an unused slot or find the match. */
12013 /* Create a hash table to map DWO IDs to their CU/TU entry in
12014 .debug_{info,types}.dwo in DWP_FILE.
12015 Returns NULL if there isn't one.
12016 Note: This function processes DWP files only, not DWO files. */
12018 static struct dwp_hash_table *
12019 create_dwp_hash_table (struct dwarf2_per_objfile *dwarf2_per_objfile,
12020 struct dwp_file *dwp_file, int is_debug_types)
12022 struct objfile *objfile = dwarf2_per_objfile->objfile;
12023 bfd *dbfd = dwp_file->dbfd.get ();
12024 const gdb_byte *index_ptr, *index_end;
12025 struct dwarf2_section_info *index;
12026 uint32_t version, nr_columns, nr_units, nr_slots;
12027 struct dwp_hash_table *htab;
12029 if (is_debug_types)
12030 index = &dwp_file->sections.tu_index;
12032 index = &dwp_file->sections.cu_index;
12034 if (dwarf2_section_empty_p (index))
12036 dwarf2_read_section (objfile, index);
12038 index_ptr = index->buffer;
12039 index_end = index_ptr + index->size;
12041 version = read_4_bytes (dbfd, index_ptr);
12044 nr_columns = read_4_bytes (dbfd, index_ptr);
12048 nr_units = read_4_bytes (dbfd, index_ptr);
12050 nr_slots = read_4_bytes (dbfd, index_ptr);
12053 if (version != 1 && version != 2)
12055 error (_("Dwarf Error: unsupported DWP file version (%s)"
12056 " [in module %s]"),
12057 pulongest (version), dwp_file->name);
12059 if (nr_slots != (nr_slots & -nr_slots))
12061 error (_("Dwarf Error: number of slots in DWP hash table (%s)"
12062 " is not power of 2 [in module %s]"),
12063 pulongest (nr_slots), dwp_file->name);
12066 htab = OBSTACK_ZALLOC (&objfile->objfile_obstack, struct dwp_hash_table);
12067 htab->version = version;
12068 htab->nr_columns = nr_columns;
12069 htab->nr_units = nr_units;
12070 htab->nr_slots = nr_slots;
12071 htab->hash_table = index_ptr;
12072 htab->unit_table = htab->hash_table + sizeof (uint64_t) * nr_slots;
12074 /* Exit early if the table is empty. */
12075 if (nr_slots == 0 || nr_units == 0
12076 || (version == 2 && nr_columns == 0))
12078 /* All must be zero. */
12079 if (nr_slots != 0 || nr_units != 0
12080 || (version == 2 && nr_columns != 0))
12082 complaint (_("Empty DWP but nr_slots,nr_units,nr_columns not"
12083 " all zero [in modules %s]"),
12091 htab->section_pool.v1.indices =
12092 htab->unit_table + sizeof (uint32_t) * nr_slots;
12093 /* It's harder to decide whether the section is too small in v1.
12094 V1 is deprecated anyway so we punt. */
12098 const gdb_byte *ids_ptr = htab->unit_table + sizeof (uint32_t) * nr_slots;
12099 int *ids = htab->section_pool.v2.section_ids;
12100 /* Reverse map for error checking. */
12101 int ids_seen[DW_SECT_MAX + 1];
12104 if (nr_columns < 2)
12106 error (_("Dwarf Error: bad DWP hash table, too few columns"
12107 " in section table [in module %s]"),
12110 if (nr_columns > MAX_NR_V2_DWO_SECTIONS)
12112 error (_("Dwarf Error: bad DWP hash table, too many columns"
12113 " in section table [in module %s]"),
12116 memset (ids, 255, (DW_SECT_MAX + 1) * sizeof (int32_t));
12117 memset (ids_seen, 255, (DW_SECT_MAX + 1) * sizeof (int32_t));
12118 for (i = 0; i < nr_columns; ++i)
12120 int id = read_4_bytes (dbfd, ids_ptr + i * sizeof (uint32_t));
12122 if (id < DW_SECT_MIN || id > DW_SECT_MAX)
12124 error (_("Dwarf Error: bad DWP hash table, bad section id %d"
12125 " in section table [in module %s]"),
12126 id, dwp_file->name);
12128 if (ids_seen[id] != -1)
12130 error (_("Dwarf Error: bad DWP hash table, duplicate section"
12131 " id %d in section table [in module %s]"),
12132 id, dwp_file->name);
12137 /* Must have exactly one info or types section. */
12138 if (((ids_seen[DW_SECT_INFO] != -1)
12139 + (ids_seen[DW_SECT_TYPES] != -1))
12142 error (_("Dwarf Error: bad DWP hash table, missing/duplicate"
12143 " DWO info/types section [in module %s]"),
12146 /* Must have an abbrev section. */
12147 if (ids_seen[DW_SECT_ABBREV] == -1)
12149 error (_("Dwarf Error: bad DWP hash table, missing DWO abbrev"
12150 " section [in module %s]"),
12153 htab->section_pool.v2.offsets = ids_ptr + sizeof (uint32_t) * nr_columns;
12154 htab->section_pool.v2.sizes =
12155 htab->section_pool.v2.offsets + (sizeof (uint32_t)
12156 * nr_units * nr_columns);
12157 if ((htab->section_pool.v2.sizes + (sizeof (uint32_t)
12158 * nr_units * nr_columns))
12161 error (_("Dwarf Error: DWP index section is corrupt (too small)"
12162 " [in module %s]"),
12170 /* Update SECTIONS with the data from SECTP.
12172 This function is like the other "locate" section routines that are
12173 passed to bfd_map_over_sections, but in this context the sections to
12174 read comes from the DWP V1 hash table, not the full ELF section table.
12176 The result is non-zero for success, or zero if an error was found. */
12179 locate_v1_virtual_dwo_sections (asection *sectp,
12180 struct virtual_v1_dwo_sections *sections)
12182 const struct dwop_section_names *names = &dwop_section_names;
12184 if (section_is_p (sectp->name, &names->abbrev_dwo))
12186 /* There can be only one. */
12187 if (sections->abbrev.s.section != NULL)
12189 sections->abbrev.s.section = sectp;
12190 sections->abbrev.size = bfd_get_section_size (sectp);
12192 else if (section_is_p (sectp->name, &names->info_dwo)
12193 || section_is_p (sectp->name, &names->types_dwo))
12195 /* There can be only one. */
12196 if (sections->info_or_types.s.section != NULL)
12198 sections->info_or_types.s.section = sectp;
12199 sections->info_or_types.size = bfd_get_section_size (sectp);
12201 else if (section_is_p (sectp->name, &names->line_dwo))
12203 /* There can be only one. */
12204 if (sections->line.s.section != NULL)
12206 sections->line.s.section = sectp;
12207 sections->line.size = bfd_get_section_size (sectp);
12209 else if (section_is_p (sectp->name, &names->loc_dwo))
12211 /* There can be only one. */
12212 if (sections->loc.s.section != NULL)
12214 sections->loc.s.section = sectp;
12215 sections->loc.size = bfd_get_section_size (sectp);
12217 else if (section_is_p (sectp->name, &names->macinfo_dwo))
12219 /* There can be only one. */
12220 if (sections->macinfo.s.section != NULL)
12222 sections->macinfo.s.section = sectp;
12223 sections->macinfo.size = bfd_get_section_size (sectp);
12225 else if (section_is_p (sectp->name, &names->macro_dwo))
12227 /* There can be only one. */
12228 if (sections->macro.s.section != NULL)
12230 sections->macro.s.section = sectp;
12231 sections->macro.size = bfd_get_section_size (sectp);
12233 else if (section_is_p (sectp->name, &names->str_offsets_dwo))
12235 /* There can be only one. */
12236 if (sections->str_offsets.s.section != NULL)
12238 sections->str_offsets.s.section = sectp;
12239 sections->str_offsets.size = bfd_get_section_size (sectp);
12243 /* No other kind of section is valid. */
12250 /* Create a dwo_unit object for the DWO unit with signature SIGNATURE.
12251 UNIT_INDEX is the index of the DWO unit in the DWP hash table.
12252 COMP_DIR is the DW_AT_comp_dir attribute of the referencing CU.
12253 This is for DWP version 1 files. */
12255 static struct dwo_unit *
12256 create_dwo_unit_in_dwp_v1 (struct dwarf2_per_objfile *dwarf2_per_objfile,
12257 struct dwp_file *dwp_file,
12258 uint32_t unit_index,
12259 const char *comp_dir,
12260 ULONGEST signature, int is_debug_types)
12262 struct objfile *objfile = dwarf2_per_objfile->objfile;
12263 const struct dwp_hash_table *dwp_htab =
12264 is_debug_types ? dwp_file->tus : dwp_file->cus;
12265 bfd *dbfd = dwp_file->dbfd.get ();
12266 const char *kind = is_debug_types ? "TU" : "CU";
12267 struct dwo_file *dwo_file;
12268 struct dwo_unit *dwo_unit;
12269 struct virtual_v1_dwo_sections sections;
12270 void **dwo_file_slot;
12273 gdb_assert (dwp_file->version == 1);
12275 if (dwarf_read_debug)
12277 fprintf_unfiltered (gdb_stdlog, "Reading %s %s/%s in DWP V1 file: %s\n",
12279 pulongest (unit_index), hex_string (signature),
12283 /* Fetch the sections of this DWO unit.
12284 Put a limit on the number of sections we look for so that bad data
12285 doesn't cause us to loop forever. */
12287 #define MAX_NR_V1_DWO_SECTIONS \
12288 (1 /* .debug_info or .debug_types */ \
12289 + 1 /* .debug_abbrev */ \
12290 + 1 /* .debug_line */ \
12291 + 1 /* .debug_loc */ \
12292 + 1 /* .debug_str_offsets */ \
12293 + 1 /* .debug_macro or .debug_macinfo */ \
12294 + 1 /* trailing zero */)
12296 memset (§ions, 0, sizeof (sections));
12298 for (i = 0; i < MAX_NR_V1_DWO_SECTIONS; ++i)
12301 uint32_t section_nr =
12302 read_4_bytes (dbfd,
12303 dwp_htab->section_pool.v1.indices
12304 + (unit_index + i) * sizeof (uint32_t));
12306 if (section_nr == 0)
12308 if (section_nr >= dwp_file->num_sections)
12310 error (_("Dwarf Error: bad DWP hash table, section number too large"
12311 " [in module %s]"),
12315 sectp = dwp_file->elf_sections[section_nr];
12316 if (! locate_v1_virtual_dwo_sections (sectp, §ions))
12318 error (_("Dwarf Error: bad DWP hash table, invalid section found"
12319 " [in module %s]"),
12325 || dwarf2_section_empty_p (§ions.info_or_types)
12326 || dwarf2_section_empty_p (§ions.abbrev))
12328 error (_("Dwarf Error: bad DWP hash table, missing DWO sections"
12329 " [in module %s]"),
12332 if (i == MAX_NR_V1_DWO_SECTIONS)
12334 error (_("Dwarf Error: bad DWP hash table, too many DWO sections"
12335 " [in module %s]"),
12339 /* It's easier for the rest of the code if we fake a struct dwo_file and
12340 have dwo_unit "live" in that. At least for now.
12342 The DWP file can be made up of a random collection of CUs and TUs.
12343 However, for each CU + set of TUs that came from the same original DWO
12344 file, we can combine them back into a virtual DWO file to save space
12345 (fewer struct dwo_file objects to allocate). Remember that for really
12346 large apps there can be on the order of 8K CUs and 200K TUs, or more. */
12348 std::string virtual_dwo_name =
12349 string_printf ("virtual-dwo/%d-%d-%d-%d",
12350 get_section_id (§ions.abbrev),
12351 get_section_id (§ions.line),
12352 get_section_id (§ions.loc),
12353 get_section_id (§ions.str_offsets));
12354 /* Can we use an existing virtual DWO file? */
12355 dwo_file_slot = lookup_dwo_file_slot (dwarf2_per_objfile,
12356 virtual_dwo_name.c_str (),
12358 /* Create one if necessary. */
12359 if (*dwo_file_slot == NULL)
12361 if (dwarf_read_debug)
12363 fprintf_unfiltered (gdb_stdlog, "Creating virtual DWO: %s\n",
12364 virtual_dwo_name.c_str ());
12366 dwo_file = OBSTACK_ZALLOC (&objfile->objfile_obstack, struct dwo_file);
12368 = (const char *) obstack_copy0 (&objfile->objfile_obstack,
12369 virtual_dwo_name.c_str (),
12370 virtual_dwo_name.size ());
12371 dwo_file->comp_dir = comp_dir;
12372 dwo_file->sections.abbrev = sections.abbrev;
12373 dwo_file->sections.line = sections.line;
12374 dwo_file->sections.loc = sections.loc;
12375 dwo_file->sections.macinfo = sections.macinfo;
12376 dwo_file->sections.macro = sections.macro;
12377 dwo_file->sections.str_offsets = sections.str_offsets;
12378 /* The "str" section is global to the entire DWP file. */
12379 dwo_file->sections.str = dwp_file->sections.str;
12380 /* The info or types section is assigned below to dwo_unit,
12381 there's no need to record it in dwo_file.
12382 Also, we can't simply record type sections in dwo_file because
12383 we record a pointer into the vector in dwo_unit. As we collect more
12384 types we'll grow the vector and eventually have to reallocate space
12385 for it, invalidating all copies of pointers into the previous
12387 *dwo_file_slot = dwo_file;
12391 if (dwarf_read_debug)
12393 fprintf_unfiltered (gdb_stdlog, "Using existing virtual DWO: %s\n",
12394 virtual_dwo_name.c_str ());
12396 dwo_file = (struct dwo_file *) *dwo_file_slot;
12399 dwo_unit = OBSTACK_ZALLOC (&objfile->objfile_obstack, struct dwo_unit);
12400 dwo_unit->dwo_file = dwo_file;
12401 dwo_unit->signature = signature;
12402 dwo_unit->section =
12403 XOBNEW (&objfile->objfile_obstack, struct dwarf2_section_info);
12404 *dwo_unit->section = sections.info_or_types;
12405 /* dwo_unit->{offset,length,type_offset_in_tu} are set later. */
12410 /* Subroutine of create_dwo_unit_in_dwp_v2 to simplify it.
12411 Given a pointer to the containing section SECTION, and OFFSET,SIZE of the
12412 piece within that section used by a TU/CU, return a virtual section
12413 of just that piece. */
12415 static struct dwarf2_section_info
12416 create_dwp_v2_section (struct dwarf2_per_objfile *dwarf2_per_objfile,
12417 struct dwarf2_section_info *section,
12418 bfd_size_type offset, bfd_size_type size)
12420 struct dwarf2_section_info result;
12423 gdb_assert (section != NULL);
12424 gdb_assert (!section->is_virtual);
12426 memset (&result, 0, sizeof (result));
12427 result.s.containing_section = section;
12428 result.is_virtual = 1;
12433 sectp = get_section_bfd_section (section);
12435 /* Flag an error if the piece denoted by OFFSET,SIZE is outside the
12436 bounds of the real section. This is a pretty-rare event, so just
12437 flag an error (easier) instead of a warning and trying to cope. */
12439 || offset + size > bfd_get_section_size (sectp))
12441 error (_("Dwarf Error: Bad DWP V2 section info, doesn't fit"
12442 " in section %s [in module %s]"),
12443 sectp ? bfd_section_name (abfd, sectp) : "<unknown>",
12444 objfile_name (dwarf2_per_objfile->objfile));
12447 result.virtual_offset = offset;
12448 result.size = size;
12452 /* Create a dwo_unit object for the DWO unit with signature SIGNATURE.
12453 UNIT_INDEX is the index of the DWO unit in the DWP hash table.
12454 COMP_DIR is the DW_AT_comp_dir attribute of the referencing CU.
12455 This is for DWP version 2 files. */
12457 static struct dwo_unit *
12458 create_dwo_unit_in_dwp_v2 (struct dwarf2_per_objfile *dwarf2_per_objfile,
12459 struct dwp_file *dwp_file,
12460 uint32_t unit_index,
12461 const char *comp_dir,
12462 ULONGEST signature, int is_debug_types)
12464 struct objfile *objfile = dwarf2_per_objfile->objfile;
12465 const struct dwp_hash_table *dwp_htab =
12466 is_debug_types ? dwp_file->tus : dwp_file->cus;
12467 bfd *dbfd = dwp_file->dbfd.get ();
12468 const char *kind = is_debug_types ? "TU" : "CU";
12469 struct dwo_file *dwo_file;
12470 struct dwo_unit *dwo_unit;
12471 struct virtual_v2_dwo_sections sections;
12472 void **dwo_file_slot;
12475 gdb_assert (dwp_file->version == 2);
12477 if (dwarf_read_debug)
12479 fprintf_unfiltered (gdb_stdlog, "Reading %s %s/%s in DWP V2 file: %s\n",
12481 pulongest (unit_index), hex_string (signature),
12485 /* Fetch the section offsets of this DWO unit. */
12487 memset (§ions, 0, sizeof (sections));
12489 for (i = 0; i < dwp_htab->nr_columns; ++i)
12491 uint32_t offset = read_4_bytes (dbfd,
12492 dwp_htab->section_pool.v2.offsets
12493 + (((unit_index - 1) * dwp_htab->nr_columns
12495 * sizeof (uint32_t)));
12496 uint32_t size = read_4_bytes (dbfd,
12497 dwp_htab->section_pool.v2.sizes
12498 + (((unit_index - 1) * dwp_htab->nr_columns
12500 * sizeof (uint32_t)));
12502 switch (dwp_htab->section_pool.v2.section_ids[i])
12505 case DW_SECT_TYPES:
12506 sections.info_or_types_offset = offset;
12507 sections.info_or_types_size = size;
12509 case DW_SECT_ABBREV:
12510 sections.abbrev_offset = offset;
12511 sections.abbrev_size = size;
12514 sections.line_offset = offset;
12515 sections.line_size = size;
12518 sections.loc_offset = offset;
12519 sections.loc_size = size;
12521 case DW_SECT_STR_OFFSETS:
12522 sections.str_offsets_offset = offset;
12523 sections.str_offsets_size = size;
12525 case DW_SECT_MACINFO:
12526 sections.macinfo_offset = offset;
12527 sections.macinfo_size = size;
12529 case DW_SECT_MACRO:
12530 sections.macro_offset = offset;
12531 sections.macro_size = size;
12536 /* It's easier for the rest of the code if we fake a struct dwo_file and
12537 have dwo_unit "live" in that. At least for now.
12539 The DWP file can be made up of a random collection of CUs and TUs.
12540 However, for each CU + set of TUs that came from the same original DWO
12541 file, we can combine them back into a virtual DWO file to save space
12542 (fewer struct dwo_file objects to allocate). Remember that for really
12543 large apps there can be on the order of 8K CUs and 200K TUs, or more. */
12545 std::string virtual_dwo_name =
12546 string_printf ("virtual-dwo/%ld-%ld-%ld-%ld",
12547 (long) (sections.abbrev_size ? sections.abbrev_offset : 0),
12548 (long) (sections.line_size ? sections.line_offset : 0),
12549 (long) (sections.loc_size ? sections.loc_offset : 0),
12550 (long) (sections.str_offsets_size
12551 ? sections.str_offsets_offset : 0));
12552 /* Can we use an existing virtual DWO file? */
12553 dwo_file_slot = lookup_dwo_file_slot (dwarf2_per_objfile,
12554 virtual_dwo_name.c_str (),
12556 /* Create one if necessary. */
12557 if (*dwo_file_slot == NULL)
12559 if (dwarf_read_debug)
12561 fprintf_unfiltered (gdb_stdlog, "Creating virtual DWO: %s\n",
12562 virtual_dwo_name.c_str ());
12564 dwo_file = OBSTACK_ZALLOC (&objfile->objfile_obstack, struct dwo_file);
12566 = (const char *) obstack_copy0 (&objfile->objfile_obstack,
12567 virtual_dwo_name.c_str (),
12568 virtual_dwo_name.size ());
12569 dwo_file->comp_dir = comp_dir;
12570 dwo_file->sections.abbrev =
12571 create_dwp_v2_section (dwarf2_per_objfile, &dwp_file->sections.abbrev,
12572 sections.abbrev_offset, sections.abbrev_size);
12573 dwo_file->sections.line =
12574 create_dwp_v2_section (dwarf2_per_objfile, &dwp_file->sections.line,
12575 sections.line_offset, sections.line_size);
12576 dwo_file->sections.loc =
12577 create_dwp_v2_section (dwarf2_per_objfile, &dwp_file->sections.loc,
12578 sections.loc_offset, sections.loc_size);
12579 dwo_file->sections.macinfo =
12580 create_dwp_v2_section (dwarf2_per_objfile, &dwp_file->sections.macinfo,
12581 sections.macinfo_offset, sections.macinfo_size);
12582 dwo_file->sections.macro =
12583 create_dwp_v2_section (dwarf2_per_objfile, &dwp_file->sections.macro,
12584 sections.macro_offset, sections.macro_size);
12585 dwo_file->sections.str_offsets =
12586 create_dwp_v2_section (dwarf2_per_objfile,
12587 &dwp_file->sections.str_offsets,
12588 sections.str_offsets_offset,
12589 sections.str_offsets_size);
12590 /* The "str" section is global to the entire DWP file. */
12591 dwo_file->sections.str = dwp_file->sections.str;
12592 /* The info or types section is assigned below to dwo_unit,
12593 there's no need to record it in dwo_file.
12594 Also, we can't simply record type sections in dwo_file because
12595 we record a pointer into the vector in dwo_unit. As we collect more
12596 types we'll grow the vector and eventually have to reallocate space
12597 for it, invalidating all copies of pointers into the previous
12599 *dwo_file_slot = dwo_file;
12603 if (dwarf_read_debug)
12605 fprintf_unfiltered (gdb_stdlog, "Using existing virtual DWO: %s\n",
12606 virtual_dwo_name.c_str ());
12608 dwo_file = (struct dwo_file *) *dwo_file_slot;
12611 dwo_unit = OBSTACK_ZALLOC (&objfile->objfile_obstack, struct dwo_unit);
12612 dwo_unit->dwo_file = dwo_file;
12613 dwo_unit->signature = signature;
12614 dwo_unit->section =
12615 XOBNEW (&objfile->objfile_obstack, struct dwarf2_section_info);
12616 *dwo_unit->section = create_dwp_v2_section (dwarf2_per_objfile,
12618 ? &dwp_file->sections.types
12619 : &dwp_file->sections.info,
12620 sections.info_or_types_offset,
12621 sections.info_or_types_size);
12622 /* dwo_unit->{offset,length,type_offset_in_tu} are set later. */
12627 /* Lookup the DWO unit with SIGNATURE in DWP_FILE.
12628 Returns NULL if the signature isn't found. */
12630 static struct dwo_unit *
12631 lookup_dwo_unit_in_dwp (struct dwarf2_per_objfile *dwarf2_per_objfile,
12632 struct dwp_file *dwp_file, const char *comp_dir,
12633 ULONGEST signature, int is_debug_types)
12635 const struct dwp_hash_table *dwp_htab =
12636 is_debug_types ? dwp_file->tus : dwp_file->cus;
12637 bfd *dbfd = dwp_file->dbfd.get ();
12638 uint32_t mask = dwp_htab->nr_slots - 1;
12639 uint32_t hash = signature & mask;
12640 uint32_t hash2 = ((signature >> 32) & mask) | 1;
12643 struct dwo_unit find_dwo_cu;
12645 memset (&find_dwo_cu, 0, sizeof (find_dwo_cu));
12646 find_dwo_cu.signature = signature;
12647 slot = htab_find_slot (is_debug_types
12648 ? dwp_file->loaded_tus
12649 : dwp_file->loaded_cus,
12650 &find_dwo_cu, INSERT);
12653 return (struct dwo_unit *) *slot;
12655 /* Use a for loop so that we don't loop forever on bad debug info. */
12656 for (i = 0; i < dwp_htab->nr_slots; ++i)
12658 ULONGEST signature_in_table;
12660 signature_in_table =
12661 read_8_bytes (dbfd, dwp_htab->hash_table + hash * sizeof (uint64_t));
12662 if (signature_in_table == signature)
12664 uint32_t unit_index =
12665 read_4_bytes (dbfd,
12666 dwp_htab->unit_table + hash * sizeof (uint32_t));
12668 if (dwp_file->version == 1)
12670 *slot = create_dwo_unit_in_dwp_v1 (dwarf2_per_objfile,
12671 dwp_file, unit_index,
12672 comp_dir, signature,
12677 *slot = create_dwo_unit_in_dwp_v2 (dwarf2_per_objfile,
12678 dwp_file, unit_index,
12679 comp_dir, signature,
12682 return (struct dwo_unit *) *slot;
12684 if (signature_in_table == 0)
12686 hash = (hash + hash2) & mask;
12689 error (_("Dwarf Error: bad DWP hash table, lookup didn't terminate"
12690 " [in module %s]"),
12694 /* Subroutine of open_dwo_file,open_dwp_file to simplify them.
12695 Open the file specified by FILE_NAME and hand it off to BFD for
12696 preliminary analysis. Return a newly initialized bfd *, which
12697 includes a canonicalized copy of FILE_NAME.
12698 If IS_DWP is TRUE, we're opening a DWP file, otherwise a DWO file.
12699 SEARCH_CWD is true if the current directory is to be searched.
12700 It will be searched before debug-file-directory.
12701 If successful, the file is added to the bfd include table of the
12702 objfile's bfd (see gdb_bfd_record_inclusion).
12703 If unable to find/open the file, return NULL.
12704 NOTE: This function is derived from symfile_bfd_open. */
12706 static gdb_bfd_ref_ptr
12707 try_open_dwop_file (struct dwarf2_per_objfile *dwarf2_per_objfile,
12708 const char *file_name, int is_dwp, int search_cwd)
12711 /* Blech. OPF_TRY_CWD_FIRST also disables searching the path list if
12712 FILE_NAME contains a '/'. So we can't use it. Instead prepend "."
12713 to debug_file_directory. */
12714 const char *search_path;
12715 static const char dirname_separator_string[] = { DIRNAME_SEPARATOR, '\0' };
12717 gdb::unique_xmalloc_ptr<char> search_path_holder;
12720 if (*debug_file_directory != '\0')
12722 search_path_holder.reset (concat (".", dirname_separator_string,
12723 debug_file_directory,
12725 search_path = search_path_holder.get ();
12731 search_path = debug_file_directory;
12733 openp_flags flags = OPF_RETURN_REALPATH;
12735 flags |= OPF_SEARCH_IN_PATH;
12737 gdb::unique_xmalloc_ptr<char> absolute_name;
12738 desc = openp (search_path, flags, file_name,
12739 O_RDONLY | O_BINARY, &absolute_name);
12743 gdb_bfd_ref_ptr sym_bfd (gdb_bfd_open (absolute_name.get (),
12745 if (sym_bfd == NULL)
12747 bfd_set_cacheable (sym_bfd.get (), 1);
12749 if (!bfd_check_format (sym_bfd.get (), bfd_object))
12752 /* Success. Record the bfd as having been included by the objfile's bfd.
12753 This is important because things like demangled_names_hash lives in the
12754 objfile's per_bfd space and may have references to things like symbol
12755 names that live in the DWO/DWP file's per_bfd space. PR 16426. */
12756 gdb_bfd_record_inclusion (dwarf2_per_objfile->objfile->obfd, sym_bfd.get ());
12761 /* Try to open DWO file FILE_NAME.
12762 COMP_DIR is the DW_AT_comp_dir attribute.
12763 The result is the bfd handle of the file.
12764 If there is a problem finding or opening the file, return NULL.
12765 Upon success, the canonicalized path of the file is stored in the bfd,
12766 same as symfile_bfd_open. */
12768 static gdb_bfd_ref_ptr
12769 open_dwo_file (struct dwarf2_per_objfile *dwarf2_per_objfile,
12770 const char *file_name, const char *comp_dir)
12772 if (IS_ABSOLUTE_PATH (file_name))
12773 return try_open_dwop_file (dwarf2_per_objfile, file_name,
12774 0 /*is_dwp*/, 0 /*search_cwd*/);
12776 /* Before trying the search path, try DWO_NAME in COMP_DIR. */
12778 if (comp_dir != NULL)
12780 char *path_to_try = concat (comp_dir, SLASH_STRING,
12781 file_name, (char *) NULL);
12783 /* NOTE: If comp_dir is a relative path, this will also try the
12784 search path, which seems useful. */
12785 gdb_bfd_ref_ptr abfd (try_open_dwop_file (dwarf2_per_objfile,
12788 1 /*search_cwd*/));
12789 xfree (path_to_try);
12794 /* That didn't work, try debug-file-directory, which, despite its name,
12795 is a list of paths. */
12797 if (*debug_file_directory == '\0')
12800 return try_open_dwop_file (dwarf2_per_objfile, file_name,
12801 0 /*is_dwp*/, 1 /*search_cwd*/);
12804 /* This function is mapped across the sections and remembers the offset and
12805 size of each of the DWO debugging sections we are interested in. */
12808 dwarf2_locate_dwo_sections (bfd *abfd, asection *sectp, void *dwo_sections_ptr)
12810 struct dwo_sections *dwo_sections = (struct dwo_sections *) dwo_sections_ptr;
12811 const struct dwop_section_names *names = &dwop_section_names;
12813 if (section_is_p (sectp->name, &names->abbrev_dwo))
12815 dwo_sections->abbrev.s.section = sectp;
12816 dwo_sections->abbrev.size = bfd_get_section_size (sectp);
12818 else if (section_is_p (sectp->name, &names->info_dwo))
12820 dwo_sections->info.s.section = sectp;
12821 dwo_sections->info.size = bfd_get_section_size (sectp);
12823 else if (section_is_p (sectp->name, &names->line_dwo))
12825 dwo_sections->line.s.section = sectp;
12826 dwo_sections->line.size = bfd_get_section_size (sectp);
12828 else if (section_is_p (sectp->name, &names->loc_dwo))
12830 dwo_sections->loc.s.section = sectp;
12831 dwo_sections->loc.size = bfd_get_section_size (sectp);
12833 else if (section_is_p (sectp->name, &names->macinfo_dwo))
12835 dwo_sections->macinfo.s.section = sectp;
12836 dwo_sections->macinfo.size = bfd_get_section_size (sectp);
12838 else if (section_is_p (sectp->name, &names->macro_dwo))
12840 dwo_sections->macro.s.section = sectp;
12841 dwo_sections->macro.size = bfd_get_section_size (sectp);
12843 else if (section_is_p (sectp->name, &names->str_dwo))
12845 dwo_sections->str.s.section = sectp;
12846 dwo_sections->str.size = bfd_get_section_size (sectp);
12848 else if (section_is_p (sectp->name, &names->str_offsets_dwo))
12850 dwo_sections->str_offsets.s.section = sectp;
12851 dwo_sections->str_offsets.size = bfd_get_section_size (sectp);
12853 else if (section_is_p (sectp->name, &names->types_dwo))
12855 struct dwarf2_section_info type_section;
12857 memset (&type_section, 0, sizeof (type_section));
12858 type_section.s.section = sectp;
12859 type_section.size = bfd_get_section_size (sectp);
12860 VEC_safe_push (dwarf2_section_info_def, dwo_sections->types,
12865 /* Initialize the use of the DWO file specified by DWO_NAME and referenced
12866 by PER_CU. This is for the non-DWP case.
12867 The result is NULL if DWO_NAME can't be found. */
12869 static struct dwo_file *
12870 open_and_init_dwo_file (struct dwarf2_per_cu_data *per_cu,
12871 const char *dwo_name, const char *comp_dir)
12873 struct dwarf2_per_objfile *dwarf2_per_objfile = per_cu->dwarf2_per_objfile;
12874 struct objfile *objfile = dwarf2_per_objfile->objfile;
12876 gdb_bfd_ref_ptr dbfd (open_dwo_file (dwarf2_per_objfile, dwo_name, comp_dir));
12879 if (dwarf_read_debug)
12880 fprintf_unfiltered (gdb_stdlog, "DWO file not found: %s\n", dwo_name);
12884 /* We use a unique pointer here, despite the obstack allocation,
12885 because a dwo_file needs some cleanup if it is abandoned. */
12886 dwo_file_up dwo_file (OBSTACK_ZALLOC (&objfile->objfile_obstack,
12888 dwo_file->dwo_name = dwo_name;
12889 dwo_file->comp_dir = comp_dir;
12890 dwo_file->dbfd = dbfd.release ();
12892 bfd_map_over_sections (dwo_file->dbfd, dwarf2_locate_dwo_sections,
12893 &dwo_file->sections);
12895 create_cus_hash_table (dwarf2_per_objfile, *dwo_file, dwo_file->sections.info,
12898 create_debug_types_hash_table (dwarf2_per_objfile, dwo_file.get (),
12899 dwo_file->sections.types, dwo_file->tus);
12901 if (dwarf_read_debug)
12902 fprintf_unfiltered (gdb_stdlog, "DWO file found: %s\n", dwo_name);
12904 return dwo_file.release ();
12907 /* This function is mapped across the sections and remembers the offset and
12908 size of each of the DWP debugging sections common to version 1 and 2 that
12909 we are interested in. */
12912 dwarf2_locate_common_dwp_sections (bfd *abfd, asection *sectp,
12913 void *dwp_file_ptr)
12915 struct dwp_file *dwp_file = (struct dwp_file *) dwp_file_ptr;
12916 const struct dwop_section_names *names = &dwop_section_names;
12917 unsigned int elf_section_nr = elf_section_data (sectp)->this_idx;
12919 /* Record the ELF section number for later lookup: this is what the
12920 .debug_cu_index,.debug_tu_index tables use in DWP V1. */
12921 gdb_assert (elf_section_nr < dwp_file->num_sections);
12922 dwp_file->elf_sections[elf_section_nr] = sectp;
12924 /* Look for specific sections that we need. */
12925 if (section_is_p (sectp->name, &names->str_dwo))
12927 dwp_file->sections.str.s.section = sectp;
12928 dwp_file->sections.str.size = bfd_get_section_size (sectp);
12930 else if (section_is_p (sectp->name, &names->cu_index))
12932 dwp_file->sections.cu_index.s.section = sectp;
12933 dwp_file->sections.cu_index.size = bfd_get_section_size (sectp);
12935 else if (section_is_p (sectp->name, &names->tu_index))
12937 dwp_file->sections.tu_index.s.section = sectp;
12938 dwp_file->sections.tu_index.size = bfd_get_section_size (sectp);
12942 /* This function is mapped across the sections and remembers the offset and
12943 size of each of the DWP version 2 debugging sections that we are interested
12944 in. This is split into a separate function because we don't know if we
12945 have version 1 or 2 until we parse the cu_index/tu_index sections. */
12948 dwarf2_locate_v2_dwp_sections (bfd *abfd, asection *sectp, void *dwp_file_ptr)
12950 struct dwp_file *dwp_file = (struct dwp_file *) dwp_file_ptr;
12951 const struct dwop_section_names *names = &dwop_section_names;
12952 unsigned int elf_section_nr = elf_section_data (sectp)->this_idx;
12954 /* Record the ELF section number for later lookup: this is what the
12955 .debug_cu_index,.debug_tu_index tables use in DWP V1. */
12956 gdb_assert (elf_section_nr < dwp_file->num_sections);
12957 dwp_file->elf_sections[elf_section_nr] = sectp;
12959 /* Look for specific sections that we need. */
12960 if (section_is_p (sectp->name, &names->abbrev_dwo))
12962 dwp_file->sections.abbrev.s.section = sectp;
12963 dwp_file->sections.abbrev.size = bfd_get_section_size (sectp);
12965 else if (section_is_p (sectp->name, &names->info_dwo))
12967 dwp_file->sections.info.s.section = sectp;
12968 dwp_file->sections.info.size = bfd_get_section_size (sectp);
12970 else if (section_is_p (sectp->name, &names->line_dwo))
12972 dwp_file->sections.line.s.section = sectp;
12973 dwp_file->sections.line.size = bfd_get_section_size (sectp);
12975 else if (section_is_p (sectp->name, &names->loc_dwo))
12977 dwp_file->sections.loc.s.section = sectp;
12978 dwp_file->sections.loc.size = bfd_get_section_size (sectp);
12980 else if (section_is_p (sectp->name, &names->macinfo_dwo))
12982 dwp_file->sections.macinfo.s.section = sectp;
12983 dwp_file->sections.macinfo.size = bfd_get_section_size (sectp);
12985 else if (section_is_p (sectp->name, &names->macro_dwo))
12987 dwp_file->sections.macro.s.section = sectp;
12988 dwp_file->sections.macro.size = bfd_get_section_size (sectp);
12990 else if (section_is_p (sectp->name, &names->str_offsets_dwo))
12992 dwp_file->sections.str_offsets.s.section = sectp;
12993 dwp_file->sections.str_offsets.size = bfd_get_section_size (sectp);
12995 else if (section_is_p (sectp->name, &names->types_dwo))
12997 dwp_file->sections.types.s.section = sectp;
12998 dwp_file->sections.types.size = bfd_get_section_size (sectp);
13002 /* Hash function for dwp_file loaded CUs/TUs. */
13005 hash_dwp_loaded_cutus (const void *item)
13007 const struct dwo_unit *dwo_unit = (const struct dwo_unit *) item;
13009 /* This drops the top 32 bits of the signature, but is ok for a hash. */
13010 return dwo_unit->signature;
13013 /* Equality function for dwp_file loaded CUs/TUs. */
13016 eq_dwp_loaded_cutus (const void *a, const void *b)
13018 const struct dwo_unit *dua = (const struct dwo_unit *) a;
13019 const struct dwo_unit *dub = (const struct dwo_unit *) b;
13021 return dua->signature == dub->signature;
13024 /* Allocate a hash table for dwp_file loaded CUs/TUs. */
13027 allocate_dwp_loaded_cutus_table (struct objfile *objfile)
13029 return htab_create_alloc_ex (3,
13030 hash_dwp_loaded_cutus,
13031 eq_dwp_loaded_cutus,
13033 &objfile->objfile_obstack,
13034 hashtab_obstack_allocate,
13035 dummy_obstack_deallocate);
13038 /* Try to open DWP file FILE_NAME.
13039 The result is the bfd handle of the file.
13040 If there is a problem finding or opening the file, return NULL.
13041 Upon success, the canonicalized path of the file is stored in the bfd,
13042 same as symfile_bfd_open. */
13044 static gdb_bfd_ref_ptr
13045 open_dwp_file (struct dwarf2_per_objfile *dwarf2_per_objfile,
13046 const char *file_name)
13048 gdb_bfd_ref_ptr abfd (try_open_dwop_file (dwarf2_per_objfile, file_name,
13050 1 /*search_cwd*/));
13054 /* Work around upstream bug 15652.
13055 http://sourceware.org/bugzilla/show_bug.cgi?id=15652
13056 [Whether that's a "bug" is debatable, but it is getting in our way.]
13057 We have no real idea where the dwp file is, because gdb's realpath-ing
13058 of the executable's path may have discarded the needed info.
13059 [IWBN if the dwp file name was recorded in the executable, akin to
13060 .gnu_debuglink, but that doesn't exist yet.]
13061 Strip the directory from FILE_NAME and search again. */
13062 if (*debug_file_directory != '\0')
13064 /* Don't implicitly search the current directory here.
13065 If the user wants to search "." to handle this case,
13066 it must be added to debug-file-directory. */
13067 return try_open_dwop_file (dwarf2_per_objfile,
13068 lbasename (file_name), 1 /*is_dwp*/,
13075 /* Initialize the use of the DWP file for the current objfile.
13076 By convention the name of the DWP file is ${objfile}.dwp.
13077 The result is NULL if it can't be found. */
13079 static std::unique_ptr<struct dwp_file>
13080 open_and_init_dwp_file (struct dwarf2_per_objfile *dwarf2_per_objfile)
13082 struct objfile *objfile = dwarf2_per_objfile->objfile;
13084 /* Try to find first .dwp for the binary file before any symbolic links
13087 /* If the objfile is a debug file, find the name of the real binary
13088 file and get the name of dwp file from there. */
13089 std::string dwp_name;
13090 if (objfile->separate_debug_objfile_backlink != NULL)
13092 struct objfile *backlink = objfile->separate_debug_objfile_backlink;
13093 const char *backlink_basename = lbasename (backlink->original_name);
13095 dwp_name = ldirname (objfile->original_name) + SLASH_STRING + backlink_basename;
13098 dwp_name = objfile->original_name;
13100 dwp_name += ".dwp";
13102 gdb_bfd_ref_ptr dbfd (open_dwp_file (dwarf2_per_objfile, dwp_name.c_str ()));
13104 && strcmp (objfile->original_name, objfile_name (objfile)) != 0)
13106 /* Try to find .dwp for the binary file after gdb_realpath resolving. */
13107 dwp_name = objfile_name (objfile);
13108 dwp_name += ".dwp";
13109 dbfd = open_dwp_file (dwarf2_per_objfile, dwp_name.c_str ());
13114 if (dwarf_read_debug)
13115 fprintf_unfiltered (gdb_stdlog, "DWP file not found: %s\n", dwp_name.c_str ());
13116 return std::unique_ptr<dwp_file> ();
13119 const char *name = bfd_get_filename (dbfd.get ());
13120 std::unique_ptr<struct dwp_file> dwp_file
13121 (new struct dwp_file (name, std::move (dbfd)));
13123 /* +1: section 0 is unused */
13124 dwp_file->num_sections = bfd_count_sections (dwp_file->dbfd) + 1;
13125 dwp_file->elf_sections =
13126 OBSTACK_CALLOC (&objfile->objfile_obstack,
13127 dwp_file->num_sections, asection *);
13129 bfd_map_over_sections (dwp_file->dbfd.get (),
13130 dwarf2_locate_common_dwp_sections,
13133 dwp_file->cus = create_dwp_hash_table (dwarf2_per_objfile, dwp_file.get (),
13136 dwp_file->tus = create_dwp_hash_table (dwarf2_per_objfile, dwp_file.get (),
13139 /* The DWP file version is stored in the hash table. Oh well. */
13140 if (dwp_file->cus && dwp_file->tus
13141 && dwp_file->cus->version != dwp_file->tus->version)
13143 /* Technically speaking, we should try to limp along, but this is
13144 pretty bizarre. We use pulongest here because that's the established
13145 portability solution (e.g, we cannot use %u for uint32_t). */
13146 error (_("Dwarf Error: DWP file CU version %s doesn't match"
13147 " TU version %s [in DWP file %s]"),
13148 pulongest (dwp_file->cus->version),
13149 pulongest (dwp_file->tus->version), dwp_name.c_str ());
13153 dwp_file->version = dwp_file->cus->version;
13154 else if (dwp_file->tus)
13155 dwp_file->version = dwp_file->tus->version;
13157 dwp_file->version = 2;
13159 if (dwp_file->version == 2)
13160 bfd_map_over_sections (dwp_file->dbfd.get (),
13161 dwarf2_locate_v2_dwp_sections,
13164 dwp_file->loaded_cus = allocate_dwp_loaded_cutus_table (objfile);
13165 dwp_file->loaded_tus = allocate_dwp_loaded_cutus_table (objfile);
13167 if (dwarf_read_debug)
13169 fprintf_unfiltered (gdb_stdlog, "DWP file found: %s\n", dwp_file->name);
13170 fprintf_unfiltered (gdb_stdlog,
13171 " %s CUs, %s TUs\n",
13172 pulongest (dwp_file->cus ? dwp_file->cus->nr_units : 0),
13173 pulongest (dwp_file->tus ? dwp_file->tus->nr_units : 0));
13179 /* Wrapper around open_and_init_dwp_file, only open it once. */
13181 static struct dwp_file *
13182 get_dwp_file (struct dwarf2_per_objfile *dwarf2_per_objfile)
13184 if (! dwarf2_per_objfile->dwp_checked)
13186 dwarf2_per_objfile->dwp_file
13187 = open_and_init_dwp_file (dwarf2_per_objfile);
13188 dwarf2_per_objfile->dwp_checked = 1;
13190 return dwarf2_per_objfile->dwp_file.get ();
13193 /* Subroutine of lookup_dwo_comp_unit, lookup_dwo_type_unit.
13194 Look up the CU/TU with signature SIGNATURE, either in DWO file DWO_NAME
13195 or in the DWP file for the objfile, referenced by THIS_UNIT.
13196 If non-NULL, comp_dir is the DW_AT_comp_dir attribute.
13197 IS_DEBUG_TYPES is non-zero if reading a TU, otherwise read a CU.
13199 This is called, for example, when wanting to read a variable with a
13200 complex location. Therefore we don't want to do file i/o for every call.
13201 Therefore we don't want to look for a DWO file on every call.
13202 Therefore we first see if we've already seen SIGNATURE in a DWP file,
13203 then we check if we've already seen DWO_NAME, and only THEN do we check
13206 The result is a pointer to the dwo_unit object or NULL if we didn't find it
13207 (dwo_id mismatch or couldn't find the DWO/DWP file). */
13209 static struct dwo_unit *
13210 lookup_dwo_cutu (struct dwarf2_per_cu_data *this_unit,
13211 const char *dwo_name, const char *comp_dir,
13212 ULONGEST signature, int is_debug_types)
13214 struct dwarf2_per_objfile *dwarf2_per_objfile = this_unit->dwarf2_per_objfile;
13215 struct objfile *objfile = dwarf2_per_objfile->objfile;
13216 const char *kind = is_debug_types ? "TU" : "CU";
13217 void **dwo_file_slot;
13218 struct dwo_file *dwo_file;
13219 struct dwp_file *dwp_file;
13221 /* First see if there's a DWP file.
13222 If we have a DWP file but didn't find the DWO inside it, don't
13223 look for the original DWO file. It makes gdb behave differently
13224 depending on whether one is debugging in the build tree. */
13226 dwp_file = get_dwp_file (dwarf2_per_objfile);
13227 if (dwp_file != NULL)
13229 const struct dwp_hash_table *dwp_htab =
13230 is_debug_types ? dwp_file->tus : dwp_file->cus;
13232 if (dwp_htab != NULL)
13234 struct dwo_unit *dwo_cutu =
13235 lookup_dwo_unit_in_dwp (dwarf2_per_objfile, dwp_file, comp_dir,
13236 signature, is_debug_types);
13238 if (dwo_cutu != NULL)
13240 if (dwarf_read_debug)
13242 fprintf_unfiltered (gdb_stdlog,
13243 "Virtual DWO %s %s found: @%s\n",
13244 kind, hex_string (signature),
13245 host_address_to_string (dwo_cutu));
13253 /* No DWP file, look for the DWO file. */
13255 dwo_file_slot = lookup_dwo_file_slot (dwarf2_per_objfile,
13256 dwo_name, comp_dir);
13257 if (*dwo_file_slot == NULL)
13259 /* Read in the file and build a table of the CUs/TUs it contains. */
13260 *dwo_file_slot = open_and_init_dwo_file (this_unit, dwo_name, comp_dir);
13262 /* NOTE: This will be NULL if unable to open the file. */
13263 dwo_file = (struct dwo_file *) *dwo_file_slot;
13265 if (dwo_file != NULL)
13267 struct dwo_unit *dwo_cutu = NULL;
13269 if (is_debug_types && dwo_file->tus)
13271 struct dwo_unit find_dwo_cutu;
13273 memset (&find_dwo_cutu, 0, sizeof (find_dwo_cutu));
13274 find_dwo_cutu.signature = signature;
13276 = (struct dwo_unit *) htab_find (dwo_file->tus, &find_dwo_cutu);
13278 else if (!is_debug_types && dwo_file->cus)
13280 struct dwo_unit find_dwo_cutu;
13282 memset (&find_dwo_cutu, 0, sizeof (find_dwo_cutu));
13283 find_dwo_cutu.signature = signature;
13284 dwo_cutu = (struct dwo_unit *)htab_find (dwo_file->cus,
13288 if (dwo_cutu != NULL)
13290 if (dwarf_read_debug)
13292 fprintf_unfiltered (gdb_stdlog, "DWO %s %s(%s) found: @%s\n",
13293 kind, dwo_name, hex_string (signature),
13294 host_address_to_string (dwo_cutu));
13301 /* We didn't find it. This could mean a dwo_id mismatch, or
13302 someone deleted the DWO/DWP file, or the search path isn't set up
13303 correctly to find the file. */
13305 if (dwarf_read_debug)
13307 fprintf_unfiltered (gdb_stdlog, "DWO %s %s(%s) not found\n",
13308 kind, dwo_name, hex_string (signature));
13311 /* This is a warning and not a complaint because it can be caused by
13312 pilot error (e.g., user accidentally deleting the DWO). */
13314 /* Print the name of the DWP file if we looked there, helps the user
13315 better diagnose the problem. */
13316 std::string dwp_text;
13318 if (dwp_file != NULL)
13319 dwp_text = string_printf (" [in DWP file %s]",
13320 lbasename (dwp_file->name));
13322 warning (_("Could not find DWO %s %s(%s)%s referenced by %s at offset %s"
13323 " [in module %s]"),
13324 kind, dwo_name, hex_string (signature),
13326 this_unit->is_debug_types ? "TU" : "CU",
13327 sect_offset_str (this_unit->sect_off), objfile_name (objfile));
13332 /* Lookup the DWO CU DWO_NAME/SIGNATURE referenced from THIS_CU.
13333 See lookup_dwo_cutu_unit for details. */
13335 static struct dwo_unit *
13336 lookup_dwo_comp_unit (struct dwarf2_per_cu_data *this_cu,
13337 const char *dwo_name, const char *comp_dir,
13338 ULONGEST signature)
13340 return lookup_dwo_cutu (this_cu, dwo_name, comp_dir, signature, 0);
13343 /* Lookup the DWO TU DWO_NAME/SIGNATURE referenced from THIS_TU.
13344 See lookup_dwo_cutu_unit for details. */
13346 static struct dwo_unit *
13347 lookup_dwo_type_unit (struct signatured_type *this_tu,
13348 const char *dwo_name, const char *comp_dir)
13350 return lookup_dwo_cutu (&this_tu->per_cu, dwo_name, comp_dir, this_tu->signature, 1);
13353 /* Traversal function for queue_and_load_all_dwo_tus. */
13356 queue_and_load_dwo_tu (void **slot, void *info)
13358 struct dwo_unit *dwo_unit = (struct dwo_unit *) *slot;
13359 struct dwarf2_per_cu_data *per_cu = (struct dwarf2_per_cu_data *) info;
13360 ULONGEST signature = dwo_unit->signature;
13361 struct signatured_type *sig_type =
13362 lookup_dwo_signatured_type (per_cu->cu, signature);
13364 if (sig_type != NULL)
13366 struct dwarf2_per_cu_data *sig_cu = &sig_type->per_cu;
13368 /* We pass NULL for DEPENDENT_CU because we don't yet know if there's
13369 a real dependency of PER_CU on SIG_TYPE. That is detected later
13370 while processing PER_CU. */
13371 if (maybe_queue_comp_unit (NULL, sig_cu, per_cu->cu->language))
13372 load_full_type_unit (sig_cu);
13373 VEC_safe_push (dwarf2_per_cu_ptr, per_cu->imported_symtabs, sig_cu);
13379 /* Queue all TUs contained in the DWO of PER_CU to be read in.
13380 The DWO may have the only definition of the type, though it may not be
13381 referenced anywhere in PER_CU. Thus we have to load *all* its TUs.
13382 http://sourceware.org/bugzilla/show_bug.cgi?id=15021 */
13385 queue_and_load_all_dwo_tus (struct dwarf2_per_cu_data *per_cu)
13387 struct dwo_unit *dwo_unit;
13388 struct dwo_file *dwo_file;
13390 gdb_assert (!per_cu->is_debug_types);
13391 gdb_assert (get_dwp_file (per_cu->dwarf2_per_objfile) == NULL);
13392 gdb_assert (per_cu->cu != NULL);
13394 dwo_unit = per_cu->cu->dwo_unit;
13395 gdb_assert (dwo_unit != NULL);
13397 dwo_file = dwo_unit->dwo_file;
13398 if (dwo_file->tus != NULL)
13399 htab_traverse_noresize (dwo_file->tus, queue_and_load_dwo_tu, per_cu);
13402 /* Free all resources associated with DWO_FILE.
13403 Close the DWO file and munmap the sections. */
13406 free_dwo_file (struct dwo_file *dwo_file)
13408 /* Note: dbfd is NULL for virtual DWO files. */
13409 gdb_bfd_unref (dwo_file->dbfd);
13411 VEC_free (dwarf2_section_info_def, dwo_file->sections.types);
13414 /* Traversal function for free_dwo_files. */
13417 free_dwo_file_from_slot (void **slot, void *info)
13419 struct dwo_file *dwo_file = (struct dwo_file *) *slot;
13421 free_dwo_file (dwo_file);
13426 /* Free all resources associated with DWO_FILES. */
13429 free_dwo_files (htab_t dwo_files, struct objfile *objfile)
13431 htab_traverse_noresize (dwo_files, free_dwo_file_from_slot, objfile);
13434 /* Read in various DIEs. */
13436 /* DW_AT_abstract_origin inherits whole DIEs (not just their attributes).
13437 Inherit only the children of the DW_AT_abstract_origin DIE not being
13438 already referenced by DW_AT_abstract_origin from the children of the
13442 inherit_abstract_dies (struct die_info *die, struct dwarf2_cu *cu)
13444 struct die_info *child_die;
13445 sect_offset *offsetp;
13446 /* Parent of DIE - referenced by DW_AT_abstract_origin. */
13447 struct die_info *origin_die;
13448 /* Iterator of the ORIGIN_DIE children. */
13449 struct die_info *origin_child_die;
13450 struct attribute *attr;
13451 struct dwarf2_cu *origin_cu;
13452 struct pending **origin_previous_list_in_scope;
13454 attr = dwarf2_attr (die, DW_AT_abstract_origin, cu);
13458 /* Note that following die references may follow to a die in a
13462 origin_die = follow_die_ref (die, attr, &origin_cu);
13464 /* We're inheriting ORIGIN's children into the scope we'd put DIE's
13466 origin_previous_list_in_scope = origin_cu->list_in_scope;
13467 origin_cu->list_in_scope = cu->list_in_scope;
13469 if (die->tag != origin_die->tag
13470 && !(die->tag == DW_TAG_inlined_subroutine
13471 && origin_die->tag == DW_TAG_subprogram))
13472 complaint (_("DIE %s and its abstract origin %s have different tags"),
13473 sect_offset_str (die->sect_off),
13474 sect_offset_str (origin_die->sect_off));
13476 std::vector<sect_offset> offsets;
13478 for (child_die = die->child;
13479 child_die && child_die->tag;
13480 child_die = sibling_die (child_die))
13482 struct die_info *child_origin_die;
13483 struct dwarf2_cu *child_origin_cu;
13485 /* We are trying to process concrete instance entries:
13486 DW_TAG_call_site DIEs indeed have a DW_AT_abstract_origin tag, but
13487 it's not relevant to our analysis here. i.e. detecting DIEs that are
13488 present in the abstract instance but not referenced in the concrete
13490 if (child_die->tag == DW_TAG_call_site
13491 || child_die->tag == DW_TAG_GNU_call_site)
13494 /* For each CHILD_DIE, find the corresponding child of
13495 ORIGIN_DIE. If there is more than one layer of
13496 DW_AT_abstract_origin, follow them all; there shouldn't be,
13497 but GCC versions at least through 4.4 generate this (GCC PR
13499 child_origin_die = child_die;
13500 child_origin_cu = cu;
13503 attr = dwarf2_attr (child_origin_die, DW_AT_abstract_origin,
13507 child_origin_die = follow_die_ref (child_origin_die, attr,
13511 /* According to DWARF3 3.3.8.2 #3 new entries without their abstract
13512 counterpart may exist. */
13513 if (child_origin_die != child_die)
13515 if (child_die->tag != child_origin_die->tag
13516 && !(child_die->tag == DW_TAG_inlined_subroutine
13517 && child_origin_die->tag == DW_TAG_subprogram))
13518 complaint (_("Child DIE %s and its abstract origin %s have "
13520 sect_offset_str (child_die->sect_off),
13521 sect_offset_str (child_origin_die->sect_off));
13522 if (child_origin_die->parent != origin_die)
13523 complaint (_("Child DIE %s and its abstract origin %s have "
13524 "different parents"),
13525 sect_offset_str (child_die->sect_off),
13526 sect_offset_str (child_origin_die->sect_off));
13528 offsets.push_back (child_origin_die->sect_off);
13531 std::sort (offsets.begin (), offsets.end ());
13532 sect_offset *offsets_end = offsets.data () + offsets.size ();
13533 for (offsetp = offsets.data () + 1; offsetp < offsets_end; offsetp++)
13534 if (offsetp[-1] == *offsetp)
13535 complaint (_("Multiple children of DIE %s refer "
13536 "to DIE %s as their abstract origin"),
13537 sect_offset_str (die->sect_off), sect_offset_str (*offsetp));
13539 offsetp = offsets.data ();
13540 origin_child_die = origin_die->child;
13541 while (origin_child_die && origin_child_die->tag)
13543 /* Is ORIGIN_CHILD_DIE referenced by any of the DIE children? */
13544 while (offsetp < offsets_end
13545 && *offsetp < origin_child_die->sect_off)
13547 if (offsetp >= offsets_end
13548 || *offsetp > origin_child_die->sect_off)
13550 /* Found that ORIGIN_CHILD_DIE is really not referenced.
13551 Check whether we're already processing ORIGIN_CHILD_DIE.
13552 This can happen with mutually referenced abstract_origins.
13554 if (!origin_child_die->in_process)
13555 process_die (origin_child_die, origin_cu);
13557 origin_child_die = sibling_die (origin_child_die);
13559 origin_cu->list_in_scope = origin_previous_list_in_scope;
13563 read_func_scope (struct die_info *die, struct dwarf2_cu *cu)
13565 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
13566 struct gdbarch *gdbarch = get_objfile_arch (objfile);
13567 struct context_stack *newobj;
13570 struct die_info *child_die;
13571 struct attribute *attr, *call_line, *call_file;
13573 CORE_ADDR baseaddr;
13574 struct block *block;
13575 int inlined_func = (die->tag == DW_TAG_inlined_subroutine);
13576 std::vector<struct symbol *> template_args;
13577 struct template_symbol *templ_func = NULL;
13581 /* If we do not have call site information, we can't show the
13582 caller of this inlined function. That's too confusing, so
13583 only use the scope for local variables. */
13584 call_line = dwarf2_attr (die, DW_AT_call_line, cu);
13585 call_file = dwarf2_attr (die, DW_AT_call_file, cu);
13586 if (call_line == NULL || call_file == NULL)
13588 read_lexical_block_scope (die, cu);
13593 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
13595 name = dwarf2_name (die, cu);
13597 /* Ignore functions with missing or empty names. These are actually
13598 illegal according to the DWARF standard. */
13601 complaint (_("missing name for subprogram DIE at %s"),
13602 sect_offset_str (die->sect_off));
13606 /* Ignore functions with missing or invalid low and high pc attributes. */
13607 if (dwarf2_get_pc_bounds (die, &lowpc, &highpc, cu, NULL)
13608 <= PC_BOUNDS_INVALID)
13610 attr = dwarf2_attr (die, DW_AT_external, cu);
13611 if (!attr || !DW_UNSND (attr))
13612 complaint (_("cannot get low and high bounds "
13613 "for subprogram DIE at %s"),
13614 sect_offset_str (die->sect_off));
13618 lowpc = gdbarch_adjust_dwarf2_addr (gdbarch, lowpc + baseaddr);
13619 highpc = gdbarch_adjust_dwarf2_addr (gdbarch, highpc + baseaddr);
13621 /* If we have any template arguments, then we must allocate a
13622 different sort of symbol. */
13623 for (child_die = die->child; child_die; child_die = sibling_die (child_die))
13625 if (child_die->tag == DW_TAG_template_type_param
13626 || child_die->tag == DW_TAG_template_value_param)
13628 templ_func = allocate_template_symbol (objfile);
13629 templ_func->subclass = SYMBOL_TEMPLATE;
13634 newobj = push_context (0, lowpc);
13635 newobj->name = new_symbol (die, read_type_die (die, cu), cu,
13636 (struct symbol *) templ_func);
13638 /* If there is a location expression for DW_AT_frame_base, record
13640 attr = dwarf2_attr (die, DW_AT_frame_base, cu);
13642 dwarf2_symbol_mark_computed (attr, newobj->name, cu, 1);
13644 /* If there is a location for the static link, record it. */
13645 newobj->static_link = NULL;
13646 attr = dwarf2_attr (die, DW_AT_static_link, cu);
13649 newobj->static_link
13650 = XOBNEW (&objfile->objfile_obstack, struct dynamic_prop);
13651 attr_to_dynamic_prop (attr, die, cu, newobj->static_link);
13654 cu->list_in_scope = &local_symbols;
13656 if (die->child != NULL)
13658 child_die = die->child;
13659 while (child_die && child_die->tag)
13661 if (child_die->tag == DW_TAG_template_type_param
13662 || child_die->tag == DW_TAG_template_value_param)
13664 struct symbol *arg = new_symbol (child_die, NULL, cu);
13667 template_args.push_back (arg);
13670 process_die (child_die, cu);
13671 child_die = sibling_die (child_die);
13675 inherit_abstract_dies (die, cu);
13677 /* If we have a DW_AT_specification, we might need to import using
13678 directives from the context of the specification DIE. See the
13679 comment in determine_prefix. */
13680 if (cu->language == language_cplus
13681 && dwarf2_attr (die, DW_AT_specification, cu))
13683 struct dwarf2_cu *spec_cu = cu;
13684 struct die_info *spec_die = die_specification (die, &spec_cu);
13688 child_die = spec_die->child;
13689 while (child_die && child_die->tag)
13691 if (child_die->tag == DW_TAG_imported_module)
13692 process_die (child_die, spec_cu);
13693 child_die = sibling_die (child_die);
13696 /* In some cases, GCC generates specification DIEs that
13697 themselves contain DW_AT_specification attributes. */
13698 spec_die = die_specification (spec_die, &spec_cu);
13702 newobj = pop_context ();
13703 /* Make a block for the local symbols within. */
13704 block = finish_block (newobj->name, &local_symbols, newobj->old_blocks,
13705 newobj->static_link, lowpc, highpc);
13707 /* For C++, set the block's scope. */
13708 if ((cu->language == language_cplus
13709 || cu->language == language_fortran
13710 || cu->language == language_d
13711 || cu->language == language_rust)
13712 && cu->processing_has_namespace_info)
13713 block_set_scope (block, determine_prefix (die, cu),
13714 &objfile->objfile_obstack);
13716 /* If we have address ranges, record them. */
13717 dwarf2_record_block_ranges (die, block, baseaddr, cu);
13719 gdbarch_make_symbol_special (gdbarch, newobj->name, objfile);
13721 /* Attach template arguments to function. */
13722 if (!template_args.empty ())
13724 gdb_assert (templ_func != NULL);
13726 templ_func->n_template_arguments = template_args.size ();
13727 templ_func->template_arguments
13728 = XOBNEWVEC (&objfile->objfile_obstack, struct symbol *,
13729 templ_func->n_template_arguments);
13730 memcpy (templ_func->template_arguments,
13731 template_args.data (),
13732 (templ_func->n_template_arguments * sizeof (struct symbol *)));
13735 /* In C++, we can have functions nested inside functions (e.g., when
13736 a function declares a class that has methods). This means that
13737 when we finish processing a function scope, we may need to go
13738 back to building a containing block's symbol lists. */
13739 local_symbols = newobj->locals;
13740 local_using_directives = newobj->local_using_directives;
13742 /* If we've finished processing a top-level function, subsequent
13743 symbols go in the file symbol list. */
13744 if (outermost_context_p ())
13745 cu->list_in_scope = &file_symbols;
13748 /* Process all the DIES contained within a lexical block scope. Start
13749 a new scope, process the dies, and then close the scope. */
13752 read_lexical_block_scope (struct die_info *die, struct dwarf2_cu *cu)
13754 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
13755 struct gdbarch *gdbarch = get_objfile_arch (objfile);
13756 struct context_stack *newobj;
13757 CORE_ADDR lowpc, highpc;
13758 struct die_info *child_die;
13759 CORE_ADDR baseaddr;
13761 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
13763 /* Ignore blocks with missing or invalid low and high pc attributes. */
13764 /* ??? Perhaps consider discontiguous blocks defined by DW_AT_ranges
13765 as multiple lexical blocks? Handling children in a sane way would
13766 be nasty. Might be easier to properly extend generic blocks to
13767 describe ranges. */
13768 switch (dwarf2_get_pc_bounds (die, &lowpc, &highpc, cu, NULL))
13770 case PC_BOUNDS_NOT_PRESENT:
13771 /* DW_TAG_lexical_block has no attributes, process its children as if
13772 there was no wrapping by that DW_TAG_lexical_block.
13773 GCC does no longer produces such DWARF since GCC r224161. */
13774 for (child_die = die->child;
13775 child_die != NULL && child_die->tag;
13776 child_die = sibling_die (child_die))
13777 process_die (child_die, cu);
13779 case PC_BOUNDS_INVALID:
13782 lowpc = gdbarch_adjust_dwarf2_addr (gdbarch, lowpc + baseaddr);
13783 highpc = gdbarch_adjust_dwarf2_addr (gdbarch, highpc + baseaddr);
13785 push_context (0, lowpc);
13786 if (die->child != NULL)
13788 child_die = die->child;
13789 while (child_die && child_die->tag)
13791 process_die (child_die, cu);
13792 child_die = sibling_die (child_die);
13795 inherit_abstract_dies (die, cu);
13796 newobj = pop_context ();
13798 if (local_symbols != NULL || local_using_directives != NULL)
13800 struct block *block
13801 = finish_block (0, &local_symbols, newobj->old_blocks, NULL,
13802 newobj->start_addr, highpc);
13804 /* Note that recording ranges after traversing children, as we
13805 do here, means that recording a parent's ranges entails
13806 walking across all its children's ranges as they appear in
13807 the address map, which is quadratic behavior.
13809 It would be nicer to record the parent's ranges before
13810 traversing its children, simply overriding whatever you find
13811 there. But since we don't even decide whether to create a
13812 block until after we've traversed its children, that's hard
13814 dwarf2_record_block_ranges (die, block, baseaddr, cu);
13816 local_symbols = newobj->locals;
13817 local_using_directives = newobj->local_using_directives;
13820 /* Read in DW_TAG_call_site and insert it to CU->call_site_htab. */
13823 read_call_site_scope (struct die_info *die, struct dwarf2_cu *cu)
13825 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
13826 struct gdbarch *gdbarch = get_objfile_arch (objfile);
13827 CORE_ADDR pc, baseaddr;
13828 struct attribute *attr;
13829 struct call_site *call_site, call_site_local;
13832 struct die_info *child_die;
13834 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
13836 attr = dwarf2_attr (die, DW_AT_call_return_pc, cu);
13839 /* This was a pre-DWARF-5 GNU extension alias
13840 for DW_AT_call_return_pc. */
13841 attr = dwarf2_attr (die, DW_AT_low_pc, cu);
13845 complaint (_("missing DW_AT_call_return_pc for DW_TAG_call_site "
13846 "DIE %s [in module %s]"),
13847 sect_offset_str (die->sect_off), objfile_name (objfile));
13850 pc = attr_value_as_address (attr) + baseaddr;
13851 pc = gdbarch_adjust_dwarf2_addr (gdbarch, pc);
13853 if (cu->call_site_htab == NULL)
13854 cu->call_site_htab = htab_create_alloc_ex (16, core_addr_hash, core_addr_eq,
13855 NULL, &objfile->objfile_obstack,
13856 hashtab_obstack_allocate, NULL);
13857 call_site_local.pc = pc;
13858 slot = htab_find_slot (cu->call_site_htab, &call_site_local, INSERT);
13861 complaint (_("Duplicate PC %s for DW_TAG_call_site "
13862 "DIE %s [in module %s]"),
13863 paddress (gdbarch, pc), sect_offset_str (die->sect_off),
13864 objfile_name (objfile));
13868 /* Count parameters at the caller. */
13871 for (child_die = die->child; child_die && child_die->tag;
13872 child_die = sibling_die (child_die))
13874 if (child_die->tag != DW_TAG_call_site_parameter
13875 && child_die->tag != DW_TAG_GNU_call_site_parameter)
13877 complaint (_("Tag %d is not DW_TAG_call_site_parameter in "
13878 "DW_TAG_call_site child DIE %s [in module %s]"),
13879 child_die->tag, sect_offset_str (child_die->sect_off),
13880 objfile_name (objfile));
13888 = ((struct call_site *)
13889 obstack_alloc (&objfile->objfile_obstack,
13890 sizeof (*call_site)
13891 + (sizeof (*call_site->parameter) * (nparams - 1))));
13893 memset (call_site, 0, sizeof (*call_site) - sizeof (*call_site->parameter));
13894 call_site->pc = pc;
13896 if (dwarf2_flag_true_p (die, DW_AT_call_tail_call, cu)
13897 || dwarf2_flag_true_p (die, DW_AT_GNU_tail_call, cu))
13899 struct die_info *func_die;
13901 /* Skip also over DW_TAG_inlined_subroutine. */
13902 for (func_die = die->parent;
13903 func_die && func_die->tag != DW_TAG_subprogram
13904 && func_die->tag != DW_TAG_subroutine_type;
13905 func_die = func_die->parent);
13907 /* DW_AT_call_all_calls is a superset
13908 of DW_AT_call_all_tail_calls. */
13910 && !dwarf2_flag_true_p (func_die, DW_AT_call_all_calls, cu)
13911 && !dwarf2_flag_true_p (func_die, DW_AT_GNU_all_call_sites, cu)
13912 && !dwarf2_flag_true_p (func_die, DW_AT_call_all_tail_calls, cu)
13913 && !dwarf2_flag_true_p (func_die, DW_AT_GNU_all_tail_call_sites, cu))
13915 /* TYPE_TAIL_CALL_LIST is not interesting in functions where it is
13916 not complete. But keep CALL_SITE for look ups via call_site_htab,
13917 both the initial caller containing the real return address PC and
13918 the final callee containing the current PC of a chain of tail
13919 calls do not need to have the tail call list complete. But any
13920 function candidate for a virtual tail call frame searched via
13921 TYPE_TAIL_CALL_LIST must have the tail call list complete to be
13922 determined unambiguously. */
13926 struct type *func_type = NULL;
13929 func_type = get_die_type (func_die, cu);
13930 if (func_type != NULL)
13932 gdb_assert (TYPE_CODE (func_type) == TYPE_CODE_FUNC);
13934 /* Enlist this call site to the function. */
13935 call_site->tail_call_next = TYPE_TAIL_CALL_LIST (func_type);
13936 TYPE_TAIL_CALL_LIST (func_type) = call_site;
13939 complaint (_("Cannot find function owning DW_TAG_call_site "
13940 "DIE %s [in module %s]"),
13941 sect_offset_str (die->sect_off), objfile_name (objfile));
13945 attr = dwarf2_attr (die, DW_AT_call_target, cu);
13947 attr = dwarf2_attr (die, DW_AT_GNU_call_site_target, cu);
13949 attr = dwarf2_attr (die, DW_AT_call_origin, cu);
13952 /* This was a pre-DWARF-5 GNU extension alias for DW_AT_call_origin. */
13953 attr = dwarf2_attr (die, DW_AT_abstract_origin, cu);
13955 SET_FIELD_DWARF_BLOCK (call_site->target, NULL);
13956 if (!attr || (attr_form_is_block (attr) && DW_BLOCK (attr)->size == 0))
13957 /* Keep NULL DWARF_BLOCK. */;
13958 else if (attr_form_is_block (attr))
13960 struct dwarf2_locexpr_baton *dlbaton;
13962 dlbaton = XOBNEW (&objfile->objfile_obstack, struct dwarf2_locexpr_baton);
13963 dlbaton->data = DW_BLOCK (attr)->data;
13964 dlbaton->size = DW_BLOCK (attr)->size;
13965 dlbaton->per_cu = cu->per_cu;
13967 SET_FIELD_DWARF_BLOCK (call_site->target, dlbaton);
13969 else if (attr_form_is_ref (attr))
13971 struct dwarf2_cu *target_cu = cu;
13972 struct die_info *target_die;
13974 target_die = follow_die_ref (die, attr, &target_cu);
13975 gdb_assert (target_cu->per_cu->dwarf2_per_objfile->objfile == objfile);
13976 if (die_is_declaration (target_die, target_cu))
13978 const char *target_physname;
13980 /* Prefer the mangled name; otherwise compute the demangled one. */
13981 target_physname = dw2_linkage_name (target_die, target_cu);
13982 if (target_physname == NULL)
13983 target_physname = dwarf2_physname (NULL, target_die, target_cu);
13984 if (target_physname == NULL)
13985 complaint (_("DW_AT_call_target target DIE has invalid "
13986 "physname, for referencing DIE %s [in module %s]"),
13987 sect_offset_str (die->sect_off), objfile_name (objfile));
13989 SET_FIELD_PHYSNAME (call_site->target, target_physname);
13995 /* DW_AT_entry_pc should be preferred. */
13996 if (dwarf2_get_pc_bounds (target_die, &lowpc, NULL, target_cu, NULL)
13997 <= PC_BOUNDS_INVALID)
13998 complaint (_("DW_AT_call_target target DIE has invalid "
13999 "low pc, for referencing DIE %s [in module %s]"),
14000 sect_offset_str (die->sect_off), objfile_name (objfile));
14003 lowpc = gdbarch_adjust_dwarf2_addr (gdbarch, lowpc + baseaddr);
14004 SET_FIELD_PHYSADDR (call_site->target, lowpc);
14009 complaint (_("DW_TAG_call_site DW_AT_call_target is neither "
14010 "block nor reference, for DIE %s [in module %s]"),
14011 sect_offset_str (die->sect_off), objfile_name (objfile));
14013 call_site->per_cu = cu->per_cu;
14015 for (child_die = die->child;
14016 child_die && child_die->tag;
14017 child_die = sibling_die (child_die))
14019 struct call_site_parameter *parameter;
14020 struct attribute *loc, *origin;
14022 if (child_die->tag != DW_TAG_call_site_parameter
14023 && child_die->tag != DW_TAG_GNU_call_site_parameter)
14025 /* Already printed the complaint above. */
14029 gdb_assert (call_site->parameter_count < nparams);
14030 parameter = &call_site->parameter[call_site->parameter_count];
14032 /* DW_AT_location specifies the register number or DW_AT_abstract_origin
14033 specifies DW_TAG_formal_parameter. Value of the data assumed for the
14034 register is contained in DW_AT_call_value. */
14036 loc = dwarf2_attr (child_die, DW_AT_location, cu);
14037 origin = dwarf2_attr (child_die, DW_AT_call_parameter, cu);
14038 if (origin == NULL)
14040 /* This was a pre-DWARF-5 GNU extension alias
14041 for DW_AT_call_parameter. */
14042 origin = dwarf2_attr (child_die, DW_AT_abstract_origin, cu);
14044 if (loc == NULL && origin != NULL && attr_form_is_ref (origin))
14046 parameter->kind = CALL_SITE_PARAMETER_PARAM_OFFSET;
14048 sect_offset sect_off
14049 = (sect_offset) dwarf2_get_ref_die_offset (origin);
14050 if (!offset_in_cu_p (&cu->header, sect_off))
14052 /* As DW_OP_GNU_parameter_ref uses CU-relative offset this
14053 binding can be done only inside one CU. Such referenced DIE
14054 therefore cannot be even moved to DW_TAG_partial_unit. */
14055 complaint (_("DW_AT_call_parameter offset is not in CU for "
14056 "DW_TAG_call_site child DIE %s [in module %s]"),
14057 sect_offset_str (child_die->sect_off),
14058 objfile_name (objfile));
14061 parameter->u.param_cu_off
14062 = (cu_offset) (sect_off - cu->header.sect_off);
14064 else if (loc == NULL || origin != NULL || !attr_form_is_block (loc))
14066 complaint (_("No DW_FORM_block* DW_AT_location for "
14067 "DW_TAG_call_site child DIE %s [in module %s]"),
14068 sect_offset_str (child_die->sect_off), objfile_name (objfile));
14073 parameter->u.dwarf_reg = dwarf_block_to_dwarf_reg
14074 (DW_BLOCK (loc)->data, &DW_BLOCK (loc)->data[DW_BLOCK (loc)->size]);
14075 if (parameter->u.dwarf_reg != -1)
14076 parameter->kind = CALL_SITE_PARAMETER_DWARF_REG;
14077 else if (dwarf_block_to_sp_offset (gdbarch, DW_BLOCK (loc)->data,
14078 &DW_BLOCK (loc)->data[DW_BLOCK (loc)->size],
14079 ¶meter->u.fb_offset))
14080 parameter->kind = CALL_SITE_PARAMETER_FB_OFFSET;
14083 complaint (_("Only single DW_OP_reg or DW_OP_fbreg is supported "
14084 "for DW_FORM_block* DW_AT_location is supported for "
14085 "DW_TAG_call_site child DIE %s "
14087 sect_offset_str (child_die->sect_off),
14088 objfile_name (objfile));
14093 attr = dwarf2_attr (child_die, DW_AT_call_value, cu);
14095 attr = dwarf2_attr (child_die, DW_AT_GNU_call_site_value, cu);
14096 if (!attr_form_is_block (attr))
14098 complaint (_("No DW_FORM_block* DW_AT_call_value for "
14099 "DW_TAG_call_site child DIE %s [in module %s]"),
14100 sect_offset_str (child_die->sect_off),
14101 objfile_name (objfile));
14104 parameter->value = DW_BLOCK (attr)->data;
14105 parameter->value_size = DW_BLOCK (attr)->size;
14107 /* Parameters are not pre-cleared by memset above. */
14108 parameter->data_value = NULL;
14109 parameter->data_value_size = 0;
14110 call_site->parameter_count++;
14112 attr = dwarf2_attr (child_die, DW_AT_call_data_value, cu);
14114 attr = dwarf2_attr (child_die, DW_AT_GNU_call_site_data_value, cu);
14117 if (!attr_form_is_block (attr))
14118 complaint (_("No DW_FORM_block* DW_AT_call_data_value for "
14119 "DW_TAG_call_site child DIE %s [in module %s]"),
14120 sect_offset_str (child_die->sect_off),
14121 objfile_name (objfile));
14124 parameter->data_value = DW_BLOCK (attr)->data;
14125 parameter->data_value_size = DW_BLOCK (attr)->size;
14131 /* Helper function for read_variable. If DIE represents a virtual
14132 table, then return the type of the concrete object that is
14133 associated with the virtual table. Otherwise, return NULL. */
14135 static struct type *
14136 rust_containing_type (struct die_info *die, struct dwarf2_cu *cu)
14138 struct attribute *attr = dwarf2_attr (die, DW_AT_type, cu);
14142 /* Find the type DIE. */
14143 struct die_info *type_die = NULL;
14144 struct dwarf2_cu *type_cu = cu;
14146 if (attr_form_is_ref (attr))
14147 type_die = follow_die_ref (die, attr, &type_cu);
14148 if (type_die == NULL)
14151 if (dwarf2_attr (type_die, DW_AT_containing_type, type_cu) == NULL)
14153 return die_containing_type (type_die, type_cu);
14156 /* Read a variable (DW_TAG_variable) DIE and create a new symbol. */
14159 read_variable (struct die_info *die, struct dwarf2_cu *cu)
14161 struct rust_vtable_symbol *storage = NULL;
14163 if (cu->language == language_rust)
14165 struct type *containing_type = rust_containing_type (die, cu);
14167 if (containing_type != NULL)
14169 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
14171 storage = OBSTACK_ZALLOC (&objfile->objfile_obstack,
14172 struct rust_vtable_symbol);
14173 initialize_objfile_symbol (storage);
14174 storage->concrete_type = containing_type;
14175 storage->subclass = SYMBOL_RUST_VTABLE;
14179 new_symbol (die, NULL, cu, storage);
14182 /* Call CALLBACK from DW_AT_ranges attribute value OFFSET
14183 reading .debug_rnglists.
14184 Callback's type should be:
14185 void (CORE_ADDR range_beginning, CORE_ADDR range_end)
14186 Return true if the attributes are present and valid, otherwise,
14189 template <typename Callback>
14191 dwarf2_rnglists_process (unsigned offset, struct dwarf2_cu *cu,
14192 Callback &&callback)
14194 struct dwarf2_per_objfile *dwarf2_per_objfile
14195 = cu->per_cu->dwarf2_per_objfile;
14196 struct objfile *objfile = dwarf2_per_objfile->objfile;
14197 bfd *obfd = objfile->obfd;
14198 /* Base address selection entry. */
14201 const gdb_byte *buffer;
14202 CORE_ADDR baseaddr;
14203 bool overflow = false;
14205 found_base = cu->base_known;
14206 base = cu->base_address;
14208 dwarf2_read_section (objfile, &dwarf2_per_objfile->rnglists);
14209 if (offset >= dwarf2_per_objfile->rnglists.size)
14211 complaint (_("Offset %d out of bounds for DW_AT_ranges attribute"),
14215 buffer = dwarf2_per_objfile->rnglists.buffer + offset;
14217 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
14221 /* Initialize it due to a false compiler warning. */
14222 CORE_ADDR range_beginning = 0, range_end = 0;
14223 const gdb_byte *buf_end = (dwarf2_per_objfile->rnglists.buffer
14224 + dwarf2_per_objfile->rnglists.size);
14225 unsigned int bytes_read;
14227 if (buffer == buf_end)
14232 const auto rlet = static_cast<enum dwarf_range_list_entry>(*buffer++);
14235 case DW_RLE_end_of_list:
14237 case DW_RLE_base_address:
14238 if (buffer + cu->header.addr_size > buf_end)
14243 base = read_address (obfd, buffer, cu, &bytes_read);
14245 buffer += bytes_read;
14247 case DW_RLE_start_length:
14248 if (buffer + cu->header.addr_size > buf_end)
14253 range_beginning = read_address (obfd, buffer, cu, &bytes_read);
14254 buffer += bytes_read;
14255 range_end = (range_beginning
14256 + read_unsigned_leb128 (obfd, buffer, &bytes_read));
14257 buffer += bytes_read;
14258 if (buffer > buf_end)
14264 case DW_RLE_offset_pair:
14265 range_beginning = read_unsigned_leb128 (obfd, buffer, &bytes_read);
14266 buffer += bytes_read;
14267 if (buffer > buf_end)
14272 range_end = read_unsigned_leb128 (obfd, buffer, &bytes_read);
14273 buffer += bytes_read;
14274 if (buffer > buf_end)
14280 case DW_RLE_start_end:
14281 if (buffer + 2 * cu->header.addr_size > buf_end)
14286 range_beginning = read_address (obfd, buffer, cu, &bytes_read);
14287 buffer += bytes_read;
14288 range_end = read_address (obfd, buffer, cu, &bytes_read);
14289 buffer += bytes_read;
14292 complaint (_("Invalid .debug_rnglists data (no base address)"));
14295 if (rlet == DW_RLE_end_of_list || overflow)
14297 if (rlet == DW_RLE_base_address)
14302 /* We have no valid base address for the ranges
14304 complaint (_("Invalid .debug_rnglists data (no base address)"));
14308 if (range_beginning > range_end)
14310 /* Inverted range entries are invalid. */
14311 complaint (_("Invalid .debug_rnglists data (inverted range)"));
14315 /* Empty range entries have no effect. */
14316 if (range_beginning == range_end)
14319 range_beginning += base;
14322 /* A not-uncommon case of bad debug info.
14323 Don't pollute the addrmap with bad data. */
14324 if (range_beginning + baseaddr == 0
14325 && !dwarf2_per_objfile->has_section_at_zero)
14327 complaint (_(".debug_rnglists entry has start address of zero"
14328 " [in module %s]"), objfile_name (objfile));
14332 callback (range_beginning, range_end);
14337 complaint (_("Offset %d is not terminated "
14338 "for DW_AT_ranges attribute"),
14346 /* Call CALLBACK from DW_AT_ranges attribute value OFFSET reading .debug_ranges.
14347 Callback's type should be:
14348 void (CORE_ADDR range_beginning, CORE_ADDR range_end)
14349 Return 1 if the attributes are present and valid, otherwise, return 0. */
14351 template <typename Callback>
14353 dwarf2_ranges_process (unsigned offset, struct dwarf2_cu *cu,
14354 Callback &&callback)
14356 struct dwarf2_per_objfile *dwarf2_per_objfile
14357 = cu->per_cu->dwarf2_per_objfile;
14358 struct objfile *objfile = dwarf2_per_objfile->objfile;
14359 struct comp_unit_head *cu_header = &cu->header;
14360 bfd *obfd = objfile->obfd;
14361 unsigned int addr_size = cu_header->addr_size;
14362 CORE_ADDR mask = ~(~(CORE_ADDR)1 << (addr_size * 8 - 1));
14363 /* Base address selection entry. */
14366 unsigned int dummy;
14367 const gdb_byte *buffer;
14368 CORE_ADDR baseaddr;
14370 if (cu_header->version >= 5)
14371 return dwarf2_rnglists_process (offset, cu, callback);
14373 found_base = cu->base_known;
14374 base = cu->base_address;
14376 dwarf2_read_section (objfile, &dwarf2_per_objfile->ranges);
14377 if (offset >= dwarf2_per_objfile->ranges.size)
14379 complaint (_("Offset %d out of bounds for DW_AT_ranges attribute"),
14383 buffer = dwarf2_per_objfile->ranges.buffer + offset;
14385 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
14389 CORE_ADDR range_beginning, range_end;
14391 range_beginning = read_address (obfd, buffer, cu, &dummy);
14392 buffer += addr_size;
14393 range_end = read_address (obfd, buffer, cu, &dummy);
14394 buffer += addr_size;
14395 offset += 2 * addr_size;
14397 /* An end of list marker is a pair of zero addresses. */
14398 if (range_beginning == 0 && range_end == 0)
14399 /* Found the end of list entry. */
14402 /* Each base address selection entry is a pair of 2 values.
14403 The first is the largest possible address, the second is
14404 the base address. Check for a base address here. */
14405 if ((range_beginning & mask) == mask)
14407 /* If we found the largest possible address, then we already
14408 have the base address in range_end. */
14416 /* We have no valid base address for the ranges
14418 complaint (_("Invalid .debug_ranges data (no base address)"));
14422 if (range_beginning > range_end)
14424 /* Inverted range entries are invalid. */
14425 complaint (_("Invalid .debug_ranges data (inverted range)"));
14429 /* Empty range entries have no effect. */
14430 if (range_beginning == range_end)
14433 range_beginning += base;
14436 /* A not-uncommon case of bad debug info.
14437 Don't pollute the addrmap with bad data. */
14438 if (range_beginning + baseaddr == 0
14439 && !dwarf2_per_objfile->has_section_at_zero)
14441 complaint (_(".debug_ranges entry has start address of zero"
14442 " [in module %s]"), objfile_name (objfile));
14446 callback (range_beginning, range_end);
14452 /* Get low and high pc attributes from DW_AT_ranges attribute value OFFSET.
14453 Return 1 if the attributes are present and valid, otherwise, return 0.
14454 If RANGES_PST is not NULL we should setup `objfile->psymtabs_addrmap'. */
14457 dwarf2_ranges_read (unsigned offset, CORE_ADDR *low_return,
14458 CORE_ADDR *high_return, struct dwarf2_cu *cu,
14459 struct partial_symtab *ranges_pst)
14461 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
14462 struct gdbarch *gdbarch = get_objfile_arch (objfile);
14463 const CORE_ADDR baseaddr = ANOFFSET (objfile->section_offsets,
14464 SECT_OFF_TEXT (objfile));
14467 CORE_ADDR high = 0;
14470 retval = dwarf2_ranges_process (offset, cu,
14471 [&] (CORE_ADDR range_beginning, CORE_ADDR range_end)
14473 if (ranges_pst != NULL)
14478 lowpc = gdbarch_adjust_dwarf2_addr (gdbarch,
14479 range_beginning + baseaddr);
14480 highpc = gdbarch_adjust_dwarf2_addr (gdbarch,
14481 range_end + baseaddr);
14482 addrmap_set_empty (objfile->psymtabs_addrmap, lowpc, highpc - 1,
14486 /* FIXME: This is recording everything as a low-high
14487 segment of consecutive addresses. We should have a
14488 data structure for discontiguous block ranges
14492 low = range_beginning;
14498 if (range_beginning < low)
14499 low = range_beginning;
14500 if (range_end > high)
14508 /* If the first entry is an end-of-list marker, the range
14509 describes an empty scope, i.e. no instructions. */
14515 *high_return = high;
14519 /* Get low and high pc attributes from a die. See enum pc_bounds_kind
14520 definition for the return value. *LOWPC and *HIGHPC are set iff
14521 neither PC_BOUNDS_NOT_PRESENT nor PC_BOUNDS_INVALID are returned. */
14523 static enum pc_bounds_kind
14524 dwarf2_get_pc_bounds (struct die_info *die, CORE_ADDR *lowpc,
14525 CORE_ADDR *highpc, struct dwarf2_cu *cu,
14526 struct partial_symtab *pst)
14528 struct dwarf2_per_objfile *dwarf2_per_objfile
14529 = cu->per_cu->dwarf2_per_objfile;
14530 struct attribute *attr;
14531 struct attribute *attr_high;
14533 CORE_ADDR high = 0;
14534 enum pc_bounds_kind ret;
14536 attr_high = dwarf2_attr (die, DW_AT_high_pc, cu);
14539 attr = dwarf2_attr (die, DW_AT_low_pc, cu);
14542 low = attr_value_as_address (attr);
14543 high = attr_value_as_address (attr_high);
14544 if (cu->header.version >= 4 && attr_form_is_constant (attr_high))
14548 /* Found high w/o low attribute. */
14549 return PC_BOUNDS_INVALID;
14551 /* Found consecutive range of addresses. */
14552 ret = PC_BOUNDS_HIGH_LOW;
14556 attr = dwarf2_attr (die, DW_AT_ranges, cu);
14559 /* DW_AT_ranges_base does not apply to DIEs from the DWO skeleton.
14560 We take advantage of the fact that DW_AT_ranges does not appear
14561 in DW_TAG_compile_unit of DWO files. */
14562 int need_ranges_base = die->tag != DW_TAG_compile_unit;
14563 unsigned int ranges_offset = (DW_UNSND (attr)
14564 + (need_ranges_base
14568 /* Value of the DW_AT_ranges attribute is the offset in the
14569 .debug_ranges section. */
14570 if (!dwarf2_ranges_read (ranges_offset, &low, &high, cu, pst))
14571 return PC_BOUNDS_INVALID;
14572 /* Found discontinuous range of addresses. */
14573 ret = PC_BOUNDS_RANGES;
14576 return PC_BOUNDS_NOT_PRESENT;
14579 /* partial_die_info::read has also the strict LOW < HIGH requirement. */
14581 return PC_BOUNDS_INVALID;
14583 /* When using the GNU linker, .gnu.linkonce. sections are used to
14584 eliminate duplicate copies of functions and vtables and such.
14585 The linker will arbitrarily choose one and discard the others.
14586 The AT_*_pc values for such functions refer to local labels in
14587 these sections. If the section from that file was discarded, the
14588 labels are not in the output, so the relocs get a value of 0.
14589 If this is a discarded function, mark the pc bounds as invalid,
14590 so that GDB will ignore it. */
14591 if (low == 0 && !dwarf2_per_objfile->has_section_at_zero)
14592 return PC_BOUNDS_INVALID;
14600 /* Assuming that DIE represents a subprogram DIE or a lexical block, get
14601 its low and high PC addresses. Do nothing if these addresses could not
14602 be determined. Otherwise, set LOWPC to the low address if it is smaller,
14603 and HIGHPC to the high address if greater than HIGHPC. */
14606 dwarf2_get_subprogram_pc_bounds (struct die_info *die,
14607 CORE_ADDR *lowpc, CORE_ADDR *highpc,
14608 struct dwarf2_cu *cu)
14610 CORE_ADDR low, high;
14611 struct die_info *child = die->child;
14613 if (dwarf2_get_pc_bounds (die, &low, &high, cu, NULL) >= PC_BOUNDS_RANGES)
14615 *lowpc = std::min (*lowpc, low);
14616 *highpc = std::max (*highpc, high);
14619 /* If the language does not allow nested subprograms (either inside
14620 subprograms or lexical blocks), we're done. */
14621 if (cu->language != language_ada)
14624 /* Check all the children of the given DIE. If it contains nested
14625 subprograms, then check their pc bounds. Likewise, we need to
14626 check lexical blocks as well, as they may also contain subprogram
14628 while (child && child->tag)
14630 if (child->tag == DW_TAG_subprogram
14631 || child->tag == DW_TAG_lexical_block)
14632 dwarf2_get_subprogram_pc_bounds (child, lowpc, highpc, cu);
14633 child = sibling_die (child);
14637 /* Get the low and high pc's represented by the scope DIE, and store
14638 them in *LOWPC and *HIGHPC. If the correct values can't be
14639 determined, set *LOWPC to -1 and *HIGHPC to 0. */
14642 get_scope_pc_bounds (struct die_info *die,
14643 CORE_ADDR *lowpc, CORE_ADDR *highpc,
14644 struct dwarf2_cu *cu)
14646 CORE_ADDR best_low = (CORE_ADDR) -1;
14647 CORE_ADDR best_high = (CORE_ADDR) 0;
14648 CORE_ADDR current_low, current_high;
14650 if (dwarf2_get_pc_bounds (die, ¤t_low, ¤t_high, cu, NULL)
14651 >= PC_BOUNDS_RANGES)
14653 best_low = current_low;
14654 best_high = current_high;
14658 struct die_info *child = die->child;
14660 while (child && child->tag)
14662 switch (child->tag) {
14663 case DW_TAG_subprogram:
14664 dwarf2_get_subprogram_pc_bounds (child, &best_low, &best_high, cu);
14666 case DW_TAG_namespace:
14667 case DW_TAG_module:
14668 /* FIXME: carlton/2004-01-16: Should we do this for
14669 DW_TAG_class_type/DW_TAG_structure_type, too? I think
14670 that current GCC's always emit the DIEs corresponding
14671 to definitions of methods of classes as children of a
14672 DW_TAG_compile_unit or DW_TAG_namespace (as opposed to
14673 the DIEs giving the declarations, which could be
14674 anywhere). But I don't see any reason why the
14675 standards says that they have to be there. */
14676 get_scope_pc_bounds (child, ¤t_low, ¤t_high, cu);
14678 if (current_low != ((CORE_ADDR) -1))
14680 best_low = std::min (best_low, current_low);
14681 best_high = std::max (best_high, current_high);
14689 child = sibling_die (child);
14694 *highpc = best_high;
14697 /* Record the address ranges for BLOCK, offset by BASEADDR, as given
14701 dwarf2_record_block_ranges (struct die_info *die, struct block *block,
14702 CORE_ADDR baseaddr, struct dwarf2_cu *cu)
14704 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
14705 struct gdbarch *gdbarch = get_objfile_arch (objfile);
14706 struct attribute *attr;
14707 struct attribute *attr_high;
14709 attr_high = dwarf2_attr (die, DW_AT_high_pc, cu);
14712 attr = dwarf2_attr (die, DW_AT_low_pc, cu);
14715 CORE_ADDR low = attr_value_as_address (attr);
14716 CORE_ADDR high = attr_value_as_address (attr_high);
14718 if (cu->header.version >= 4 && attr_form_is_constant (attr_high))
14721 low = gdbarch_adjust_dwarf2_addr (gdbarch, low + baseaddr);
14722 high = gdbarch_adjust_dwarf2_addr (gdbarch, high + baseaddr);
14723 record_block_range (block, low, high - 1);
14727 attr = dwarf2_attr (die, DW_AT_ranges, cu);
14730 /* DW_AT_ranges_base does not apply to DIEs from the DWO skeleton.
14731 We take advantage of the fact that DW_AT_ranges does not appear
14732 in DW_TAG_compile_unit of DWO files. */
14733 int need_ranges_base = die->tag != DW_TAG_compile_unit;
14735 /* The value of the DW_AT_ranges attribute is the offset of the
14736 address range list in the .debug_ranges section. */
14737 unsigned long offset = (DW_UNSND (attr)
14738 + (need_ranges_base ? cu->ranges_base : 0));
14740 std::vector<blockrange> blockvec;
14741 dwarf2_ranges_process (offset, cu,
14742 [&] (CORE_ADDR start, CORE_ADDR end)
14746 start = gdbarch_adjust_dwarf2_addr (gdbarch, start);
14747 end = gdbarch_adjust_dwarf2_addr (gdbarch, end);
14748 record_block_range (block, start, end - 1);
14749 blockvec.emplace_back (start, end);
14752 BLOCK_RANGES(block) = make_blockranges (objfile, blockvec);
14756 /* Check whether the producer field indicates either of GCC < 4.6, or the
14757 Intel C/C++ compiler, and cache the result in CU. */
14760 check_producer (struct dwarf2_cu *cu)
14764 if (cu->producer == NULL)
14766 /* For unknown compilers expect their behavior is DWARF version
14769 GCC started to support .debug_types sections by -gdwarf-4 since
14770 gcc-4.5.x. As the .debug_types sections are missing DW_AT_producer
14771 for their space efficiency GDB cannot workaround gcc-4.5.x -gdwarf-4
14772 combination. gcc-4.5.x -gdwarf-4 binaries have DW_AT_accessibility
14773 interpreted incorrectly by GDB now - GCC PR debug/48229. */
14775 else if (producer_is_gcc (cu->producer, &major, &minor))
14777 cu->producer_is_gxx_lt_4_6 = major < 4 || (major == 4 && minor < 6);
14778 cu->producer_is_gcc_lt_4_3 = major < 4 || (major == 4 && minor < 3);
14780 else if (producer_is_icc (cu->producer, &major, &minor))
14781 cu->producer_is_icc_lt_14 = major < 14;
14784 /* For other non-GCC compilers, expect their behavior is DWARF version
14788 cu->checked_producer = 1;
14791 /* Check for GCC PR debug/45124 fix which is not present in any G++ version up
14792 to 4.5.any while it is present already in G++ 4.6.0 - the PR has been fixed
14793 during 4.6.0 experimental. */
14796 producer_is_gxx_lt_4_6 (struct dwarf2_cu *cu)
14798 if (!cu->checked_producer)
14799 check_producer (cu);
14801 return cu->producer_is_gxx_lt_4_6;
14804 /* Return the default accessibility type if it is not overriden by
14805 DW_AT_accessibility. */
14807 static enum dwarf_access_attribute
14808 dwarf2_default_access_attribute (struct die_info *die, struct dwarf2_cu *cu)
14810 if (cu->header.version < 3 || producer_is_gxx_lt_4_6 (cu))
14812 /* The default DWARF 2 accessibility for members is public, the default
14813 accessibility for inheritance is private. */
14815 if (die->tag != DW_TAG_inheritance)
14816 return DW_ACCESS_public;
14818 return DW_ACCESS_private;
14822 /* DWARF 3+ defines the default accessibility a different way. The same
14823 rules apply now for DW_TAG_inheritance as for the members and it only
14824 depends on the container kind. */
14826 if (die->parent->tag == DW_TAG_class_type)
14827 return DW_ACCESS_private;
14829 return DW_ACCESS_public;
14833 /* Look for DW_AT_data_member_location. Set *OFFSET to the byte
14834 offset. If the attribute was not found return 0, otherwise return
14835 1. If it was found but could not properly be handled, set *OFFSET
14839 handle_data_member_location (struct die_info *die, struct dwarf2_cu *cu,
14842 struct attribute *attr;
14844 attr = dwarf2_attr (die, DW_AT_data_member_location, cu);
14849 /* Note that we do not check for a section offset first here.
14850 This is because DW_AT_data_member_location is new in DWARF 4,
14851 so if we see it, we can assume that a constant form is really
14852 a constant and not a section offset. */
14853 if (attr_form_is_constant (attr))
14854 *offset = dwarf2_get_attr_constant_value (attr, 0);
14855 else if (attr_form_is_section_offset (attr))
14856 dwarf2_complex_location_expr_complaint ();
14857 else if (attr_form_is_block (attr))
14858 *offset = decode_locdesc (DW_BLOCK (attr), cu);
14860 dwarf2_complex_location_expr_complaint ();
14868 /* Add an aggregate field to the field list. */
14871 dwarf2_add_field (struct field_info *fip, struct die_info *die,
14872 struct dwarf2_cu *cu)
14874 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
14875 struct gdbarch *gdbarch = get_objfile_arch (objfile);
14876 struct nextfield *new_field;
14877 struct attribute *attr;
14879 const char *fieldname = "";
14881 if (die->tag == DW_TAG_inheritance)
14883 fip->baseclasses.emplace_back ();
14884 new_field = &fip->baseclasses.back ();
14888 fip->fields.emplace_back ();
14889 new_field = &fip->fields.back ();
14894 attr = dwarf2_attr (die, DW_AT_accessibility, cu);
14896 new_field->accessibility = DW_UNSND (attr);
14898 new_field->accessibility = dwarf2_default_access_attribute (die, cu);
14899 if (new_field->accessibility != DW_ACCESS_public)
14900 fip->non_public_fields = 1;
14902 attr = dwarf2_attr (die, DW_AT_virtuality, cu);
14904 new_field->virtuality = DW_UNSND (attr);
14906 new_field->virtuality = DW_VIRTUALITY_none;
14908 fp = &new_field->field;
14910 if (die->tag == DW_TAG_member && ! die_is_declaration (die, cu))
14914 /* Data member other than a C++ static data member. */
14916 /* Get type of field. */
14917 fp->type = die_type (die, cu);
14919 SET_FIELD_BITPOS (*fp, 0);
14921 /* Get bit size of field (zero if none). */
14922 attr = dwarf2_attr (die, DW_AT_bit_size, cu);
14925 FIELD_BITSIZE (*fp) = DW_UNSND (attr);
14929 FIELD_BITSIZE (*fp) = 0;
14932 /* Get bit offset of field. */
14933 if (handle_data_member_location (die, cu, &offset))
14934 SET_FIELD_BITPOS (*fp, offset * bits_per_byte);
14935 attr = dwarf2_attr (die, DW_AT_bit_offset, cu);
14938 if (gdbarch_bits_big_endian (gdbarch))
14940 /* For big endian bits, the DW_AT_bit_offset gives the
14941 additional bit offset from the MSB of the containing
14942 anonymous object to the MSB of the field. We don't
14943 have to do anything special since we don't need to
14944 know the size of the anonymous object. */
14945 SET_FIELD_BITPOS (*fp, FIELD_BITPOS (*fp) + DW_UNSND (attr));
14949 /* For little endian bits, compute the bit offset to the
14950 MSB of the anonymous object, subtract off the number of
14951 bits from the MSB of the field to the MSB of the
14952 object, and then subtract off the number of bits of
14953 the field itself. The result is the bit offset of
14954 the LSB of the field. */
14955 int anonymous_size;
14956 int bit_offset = DW_UNSND (attr);
14958 attr = dwarf2_attr (die, DW_AT_byte_size, cu);
14961 /* The size of the anonymous object containing
14962 the bit field is explicit, so use the
14963 indicated size (in bytes). */
14964 anonymous_size = DW_UNSND (attr);
14968 /* The size of the anonymous object containing
14969 the bit field must be inferred from the type
14970 attribute of the data member containing the
14972 anonymous_size = TYPE_LENGTH (fp->type);
14974 SET_FIELD_BITPOS (*fp,
14975 (FIELD_BITPOS (*fp)
14976 + anonymous_size * bits_per_byte
14977 - bit_offset - FIELD_BITSIZE (*fp)));
14980 attr = dwarf2_attr (die, DW_AT_data_bit_offset, cu);
14982 SET_FIELD_BITPOS (*fp, (FIELD_BITPOS (*fp)
14983 + dwarf2_get_attr_constant_value (attr, 0)));
14985 /* Get name of field. */
14986 fieldname = dwarf2_name (die, cu);
14987 if (fieldname == NULL)
14990 /* The name is already allocated along with this objfile, so we don't
14991 need to duplicate it for the type. */
14992 fp->name = fieldname;
14994 /* Change accessibility for artificial fields (e.g. virtual table
14995 pointer or virtual base class pointer) to private. */
14996 if (dwarf2_attr (die, DW_AT_artificial, cu))
14998 FIELD_ARTIFICIAL (*fp) = 1;
14999 new_field->accessibility = DW_ACCESS_private;
15000 fip->non_public_fields = 1;
15003 else if (die->tag == DW_TAG_member || die->tag == DW_TAG_variable)
15005 /* C++ static member. */
15007 /* NOTE: carlton/2002-11-05: It should be a DW_TAG_member that
15008 is a declaration, but all versions of G++ as of this writing
15009 (so through at least 3.2.1) incorrectly generate
15010 DW_TAG_variable tags. */
15012 const char *physname;
15014 /* Get name of field. */
15015 fieldname = dwarf2_name (die, cu);
15016 if (fieldname == NULL)
15019 attr = dwarf2_attr (die, DW_AT_const_value, cu);
15021 /* Only create a symbol if this is an external value.
15022 new_symbol checks this and puts the value in the global symbol
15023 table, which we want. If it is not external, new_symbol
15024 will try to put the value in cu->list_in_scope which is wrong. */
15025 && dwarf2_flag_true_p (die, DW_AT_external, cu))
15027 /* A static const member, not much different than an enum as far as
15028 we're concerned, except that we can support more types. */
15029 new_symbol (die, NULL, cu);
15032 /* Get physical name. */
15033 physname = dwarf2_physname (fieldname, die, cu);
15035 /* The name is already allocated along with this objfile, so we don't
15036 need to duplicate it for the type. */
15037 SET_FIELD_PHYSNAME (*fp, physname ? physname : "");
15038 FIELD_TYPE (*fp) = die_type (die, cu);
15039 FIELD_NAME (*fp) = fieldname;
15041 else if (die->tag == DW_TAG_inheritance)
15045 /* C++ base class field. */
15046 if (handle_data_member_location (die, cu, &offset))
15047 SET_FIELD_BITPOS (*fp, offset * bits_per_byte);
15048 FIELD_BITSIZE (*fp) = 0;
15049 FIELD_TYPE (*fp) = die_type (die, cu);
15050 FIELD_NAME (*fp) = TYPE_NAME (fp->type);
15052 else if (die->tag == DW_TAG_variant_part)
15054 /* process_structure_scope will treat this DIE as a union. */
15055 process_structure_scope (die, cu);
15057 /* The variant part is relative to the start of the enclosing
15059 SET_FIELD_BITPOS (*fp, 0);
15060 fp->type = get_die_type (die, cu);
15061 fp->artificial = 1;
15062 fp->name = "<<variant>>";
15064 /* Normally a DW_TAG_variant_part won't have a size, but our
15065 representation requires one, so set it to the maximum of the
15067 if (TYPE_LENGTH (fp->type) == 0)
15070 for (int i = 0; i < TYPE_NFIELDS (fp->type); ++i)
15071 if (TYPE_LENGTH (TYPE_FIELD_TYPE (fp->type, i)) > max)
15072 max = TYPE_LENGTH (TYPE_FIELD_TYPE (fp->type, i));
15073 TYPE_LENGTH (fp->type) = max;
15077 gdb_assert_not_reached ("missing case in dwarf2_add_field");
15080 /* Can the type given by DIE define another type? */
15083 type_can_define_types (const struct die_info *die)
15087 case DW_TAG_typedef:
15088 case DW_TAG_class_type:
15089 case DW_TAG_structure_type:
15090 case DW_TAG_union_type:
15091 case DW_TAG_enumeration_type:
15099 /* Add a type definition defined in the scope of the FIP's class. */
15102 dwarf2_add_type_defn (struct field_info *fip, struct die_info *die,
15103 struct dwarf2_cu *cu)
15105 struct decl_field fp;
15106 memset (&fp, 0, sizeof (fp));
15108 gdb_assert (type_can_define_types (die));
15110 /* Get name of field. NULL is okay here, meaning an anonymous type. */
15111 fp.name = dwarf2_name (die, cu);
15112 fp.type = read_type_die (die, cu);
15114 /* Save accessibility. */
15115 enum dwarf_access_attribute accessibility;
15116 struct attribute *attr = dwarf2_attr (die, DW_AT_accessibility, cu);
15118 accessibility = (enum dwarf_access_attribute) DW_UNSND (attr);
15120 accessibility = dwarf2_default_access_attribute (die, cu);
15121 switch (accessibility)
15123 case DW_ACCESS_public:
15124 /* The assumed value if neither private nor protected. */
15126 case DW_ACCESS_private:
15129 case DW_ACCESS_protected:
15130 fp.is_protected = 1;
15133 complaint (_("Unhandled DW_AT_accessibility value (%x)"), accessibility);
15136 if (die->tag == DW_TAG_typedef)
15137 fip->typedef_field_list.push_back (fp);
15139 fip->nested_types_list.push_back (fp);
15142 /* Create the vector of fields, and attach it to the type. */
15145 dwarf2_attach_fields_to_type (struct field_info *fip, struct type *type,
15146 struct dwarf2_cu *cu)
15148 int nfields = fip->nfields;
15150 /* Record the field count, allocate space for the array of fields,
15151 and create blank accessibility bitfields if necessary. */
15152 TYPE_NFIELDS (type) = nfields;
15153 TYPE_FIELDS (type) = (struct field *)
15154 TYPE_ZALLOC (type, sizeof (struct field) * nfields);
15156 if (fip->non_public_fields && cu->language != language_ada)
15158 ALLOCATE_CPLUS_STRUCT_TYPE (type);
15160 TYPE_FIELD_PRIVATE_BITS (type) =
15161 (B_TYPE *) TYPE_ALLOC (type, B_BYTES (nfields));
15162 B_CLRALL (TYPE_FIELD_PRIVATE_BITS (type), nfields);
15164 TYPE_FIELD_PROTECTED_BITS (type) =
15165 (B_TYPE *) TYPE_ALLOC (type, B_BYTES (nfields));
15166 B_CLRALL (TYPE_FIELD_PROTECTED_BITS (type), nfields);
15168 TYPE_FIELD_IGNORE_BITS (type) =
15169 (B_TYPE *) TYPE_ALLOC (type, B_BYTES (nfields));
15170 B_CLRALL (TYPE_FIELD_IGNORE_BITS (type), nfields);
15173 /* If the type has baseclasses, allocate and clear a bit vector for
15174 TYPE_FIELD_VIRTUAL_BITS. */
15175 if (!fip->baseclasses.empty () && cu->language != language_ada)
15177 int num_bytes = B_BYTES (fip->baseclasses.size ());
15178 unsigned char *pointer;
15180 ALLOCATE_CPLUS_STRUCT_TYPE (type);
15181 pointer = (unsigned char *) TYPE_ALLOC (type, num_bytes);
15182 TYPE_FIELD_VIRTUAL_BITS (type) = pointer;
15183 B_CLRALL (TYPE_FIELD_VIRTUAL_BITS (type), fip->baseclasses.size ());
15184 TYPE_N_BASECLASSES (type) = fip->baseclasses.size ();
15187 if (TYPE_FLAG_DISCRIMINATED_UNION (type))
15189 struct discriminant_info *di = alloc_discriminant_info (type, -1, -1);
15191 for (int index = 0; index < nfields; ++index)
15193 struct nextfield &field = fip->fields[index];
15195 if (field.variant.is_discriminant)
15196 di->discriminant_index = index;
15197 else if (field.variant.default_branch)
15198 di->default_index = index;
15200 di->discriminants[index] = field.variant.discriminant_value;
15204 /* Copy the saved-up fields into the field vector. */
15205 for (int i = 0; i < nfields; ++i)
15207 struct nextfield &field
15208 = ((i < fip->baseclasses.size ()) ? fip->baseclasses[i]
15209 : fip->fields[i - fip->baseclasses.size ()]);
15211 TYPE_FIELD (type, i) = field.field;
15212 switch (field.accessibility)
15214 case DW_ACCESS_private:
15215 if (cu->language != language_ada)
15216 SET_TYPE_FIELD_PRIVATE (type, i);
15219 case DW_ACCESS_protected:
15220 if (cu->language != language_ada)
15221 SET_TYPE_FIELD_PROTECTED (type, i);
15224 case DW_ACCESS_public:
15228 /* Unknown accessibility. Complain and treat it as public. */
15230 complaint (_("unsupported accessibility %d"),
15231 field.accessibility);
15235 if (i < fip->baseclasses.size ())
15237 switch (field.virtuality)
15239 case DW_VIRTUALITY_virtual:
15240 case DW_VIRTUALITY_pure_virtual:
15241 if (cu->language == language_ada)
15242 error (_("unexpected virtuality in component of Ada type"));
15243 SET_TYPE_FIELD_VIRTUAL (type, i);
15250 /* Return true if this member function is a constructor, false
15254 dwarf2_is_constructor (struct die_info *die, struct dwarf2_cu *cu)
15256 const char *fieldname;
15257 const char *type_name;
15260 if (die->parent == NULL)
15263 if (die->parent->tag != DW_TAG_structure_type
15264 && die->parent->tag != DW_TAG_union_type
15265 && die->parent->tag != DW_TAG_class_type)
15268 fieldname = dwarf2_name (die, cu);
15269 type_name = dwarf2_name (die->parent, cu);
15270 if (fieldname == NULL || type_name == NULL)
15273 len = strlen (fieldname);
15274 return (strncmp (fieldname, type_name, len) == 0
15275 && (type_name[len] == '\0' || type_name[len] == '<'));
15278 /* Add a member function to the proper fieldlist. */
15281 dwarf2_add_member_fn (struct field_info *fip, struct die_info *die,
15282 struct type *type, struct dwarf2_cu *cu)
15284 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
15285 struct attribute *attr;
15287 struct fnfieldlist *flp = nullptr;
15288 struct fn_field *fnp;
15289 const char *fieldname;
15290 struct type *this_type;
15291 enum dwarf_access_attribute accessibility;
15293 if (cu->language == language_ada)
15294 error (_("unexpected member function in Ada type"));
15296 /* Get name of member function. */
15297 fieldname = dwarf2_name (die, cu);
15298 if (fieldname == NULL)
15301 /* Look up member function name in fieldlist. */
15302 for (i = 0; i < fip->fnfieldlists.size (); i++)
15304 if (strcmp (fip->fnfieldlists[i].name, fieldname) == 0)
15306 flp = &fip->fnfieldlists[i];
15311 /* Create a new fnfieldlist if necessary. */
15312 if (flp == nullptr)
15314 fip->fnfieldlists.emplace_back ();
15315 flp = &fip->fnfieldlists.back ();
15316 flp->name = fieldname;
15317 i = fip->fnfieldlists.size () - 1;
15320 /* Create a new member function field and add it to the vector of
15322 flp->fnfields.emplace_back ();
15323 fnp = &flp->fnfields.back ();
15325 /* Delay processing of the physname until later. */
15326 if (cu->language == language_cplus)
15327 add_to_method_list (type, i, flp->fnfields.size () - 1, fieldname,
15331 const char *physname = dwarf2_physname (fieldname, die, cu);
15332 fnp->physname = physname ? physname : "";
15335 fnp->type = alloc_type (objfile);
15336 this_type = read_type_die (die, cu);
15337 if (this_type && TYPE_CODE (this_type) == TYPE_CODE_FUNC)
15339 int nparams = TYPE_NFIELDS (this_type);
15341 /* TYPE is the domain of this method, and THIS_TYPE is the type
15342 of the method itself (TYPE_CODE_METHOD). */
15343 smash_to_method_type (fnp->type, type,
15344 TYPE_TARGET_TYPE (this_type),
15345 TYPE_FIELDS (this_type),
15346 TYPE_NFIELDS (this_type),
15347 TYPE_VARARGS (this_type));
15349 /* Handle static member functions.
15350 Dwarf2 has no clean way to discern C++ static and non-static
15351 member functions. G++ helps GDB by marking the first
15352 parameter for non-static member functions (which is the this
15353 pointer) as artificial. We obtain this information from
15354 read_subroutine_type via TYPE_FIELD_ARTIFICIAL. */
15355 if (nparams == 0 || TYPE_FIELD_ARTIFICIAL (this_type, 0) == 0)
15356 fnp->voffset = VOFFSET_STATIC;
15359 complaint (_("member function type missing for '%s'"),
15360 dwarf2_full_name (fieldname, die, cu));
15362 /* Get fcontext from DW_AT_containing_type if present. */
15363 if (dwarf2_attr (die, DW_AT_containing_type, cu) != NULL)
15364 fnp->fcontext = die_containing_type (die, cu);
15366 /* dwarf2 doesn't have stubbed physical names, so the setting of is_const and
15367 is_volatile is irrelevant, as it is needed by gdb_mangle_name only. */
15369 /* Get accessibility. */
15370 attr = dwarf2_attr (die, DW_AT_accessibility, cu);
15372 accessibility = (enum dwarf_access_attribute) DW_UNSND (attr);
15374 accessibility = dwarf2_default_access_attribute (die, cu);
15375 switch (accessibility)
15377 case DW_ACCESS_private:
15378 fnp->is_private = 1;
15380 case DW_ACCESS_protected:
15381 fnp->is_protected = 1;
15385 /* Check for artificial methods. */
15386 attr = dwarf2_attr (die, DW_AT_artificial, cu);
15387 if (attr && DW_UNSND (attr) != 0)
15388 fnp->is_artificial = 1;
15390 fnp->is_constructor = dwarf2_is_constructor (die, cu);
15392 /* Get index in virtual function table if it is a virtual member
15393 function. For older versions of GCC, this is an offset in the
15394 appropriate virtual table, as specified by DW_AT_containing_type.
15395 For everyone else, it is an expression to be evaluated relative
15396 to the object address. */
15398 attr = dwarf2_attr (die, DW_AT_vtable_elem_location, cu);
15401 if (attr_form_is_block (attr) && DW_BLOCK (attr)->size > 0)
15403 if (DW_BLOCK (attr)->data[0] == DW_OP_constu)
15405 /* Old-style GCC. */
15406 fnp->voffset = decode_locdesc (DW_BLOCK (attr), cu) + 2;
15408 else if (DW_BLOCK (attr)->data[0] == DW_OP_deref
15409 || (DW_BLOCK (attr)->size > 1
15410 && DW_BLOCK (attr)->data[0] == DW_OP_deref_size
15411 && DW_BLOCK (attr)->data[1] == cu->header.addr_size))
15413 fnp->voffset = decode_locdesc (DW_BLOCK (attr), cu);
15414 if ((fnp->voffset % cu->header.addr_size) != 0)
15415 dwarf2_complex_location_expr_complaint ();
15417 fnp->voffset /= cu->header.addr_size;
15421 dwarf2_complex_location_expr_complaint ();
15423 if (!fnp->fcontext)
15425 /* If there is no `this' field and no DW_AT_containing_type,
15426 we cannot actually find a base class context for the
15428 if (TYPE_NFIELDS (this_type) == 0
15429 || !TYPE_FIELD_ARTIFICIAL (this_type, 0))
15431 complaint (_("cannot determine context for virtual member "
15432 "function \"%s\" (offset %s)"),
15433 fieldname, sect_offset_str (die->sect_off));
15438 = TYPE_TARGET_TYPE (TYPE_FIELD_TYPE (this_type, 0));
15442 else if (attr_form_is_section_offset (attr))
15444 dwarf2_complex_location_expr_complaint ();
15448 dwarf2_invalid_attrib_class_complaint ("DW_AT_vtable_elem_location",
15454 attr = dwarf2_attr (die, DW_AT_virtuality, cu);
15455 if (attr && DW_UNSND (attr))
15457 /* GCC does this, as of 2008-08-25; PR debug/37237. */
15458 complaint (_("Member function \"%s\" (offset %s) is virtual "
15459 "but the vtable offset is not specified"),
15460 fieldname, sect_offset_str (die->sect_off));
15461 ALLOCATE_CPLUS_STRUCT_TYPE (type);
15462 TYPE_CPLUS_DYNAMIC (type) = 1;
15467 /* Create the vector of member function fields, and attach it to the type. */
15470 dwarf2_attach_fn_fields_to_type (struct field_info *fip, struct type *type,
15471 struct dwarf2_cu *cu)
15473 if (cu->language == language_ada)
15474 error (_("unexpected member functions in Ada type"));
15476 ALLOCATE_CPLUS_STRUCT_TYPE (type);
15477 TYPE_FN_FIELDLISTS (type) = (struct fn_fieldlist *)
15479 sizeof (struct fn_fieldlist) * fip->fnfieldlists.size ());
15481 for (int i = 0; i < fip->fnfieldlists.size (); i++)
15483 struct fnfieldlist &nf = fip->fnfieldlists[i];
15484 struct fn_fieldlist *fn_flp = &TYPE_FN_FIELDLIST (type, i);
15486 TYPE_FN_FIELDLIST_NAME (type, i) = nf.name;
15487 TYPE_FN_FIELDLIST_LENGTH (type, i) = nf.fnfields.size ();
15488 fn_flp->fn_fields = (struct fn_field *)
15489 TYPE_ALLOC (type, sizeof (struct fn_field) * nf.fnfields.size ());
15491 for (int k = 0; k < nf.fnfields.size (); ++k)
15492 fn_flp->fn_fields[k] = nf.fnfields[k];
15495 TYPE_NFN_FIELDS (type) = fip->fnfieldlists.size ();
15498 /* Returns non-zero if NAME is the name of a vtable member in CU's
15499 language, zero otherwise. */
15501 is_vtable_name (const char *name, struct dwarf2_cu *cu)
15503 static const char vptr[] = "_vptr";
15505 /* Look for the C++ form of the vtable. */
15506 if (startswith (name, vptr) && is_cplus_marker (name[sizeof (vptr) - 1]))
15512 /* GCC outputs unnamed structures that are really pointers to member
15513 functions, with the ABI-specified layout. If TYPE describes
15514 such a structure, smash it into a member function type.
15516 GCC shouldn't do this; it should just output pointer to member DIEs.
15517 This is GCC PR debug/28767. */
15520 quirk_gcc_member_function_pointer (struct type *type, struct objfile *objfile)
15522 struct type *pfn_type, *self_type, *new_type;
15524 /* Check for a structure with no name and two children. */
15525 if (TYPE_CODE (type) != TYPE_CODE_STRUCT || TYPE_NFIELDS (type) != 2)
15528 /* Check for __pfn and __delta members. */
15529 if (TYPE_FIELD_NAME (type, 0) == NULL
15530 || strcmp (TYPE_FIELD_NAME (type, 0), "__pfn") != 0
15531 || TYPE_FIELD_NAME (type, 1) == NULL
15532 || strcmp (TYPE_FIELD_NAME (type, 1), "__delta") != 0)
15535 /* Find the type of the method. */
15536 pfn_type = TYPE_FIELD_TYPE (type, 0);
15537 if (pfn_type == NULL
15538 || TYPE_CODE (pfn_type) != TYPE_CODE_PTR
15539 || TYPE_CODE (TYPE_TARGET_TYPE (pfn_type)) != TYPE_CODE_FUNC)
15542 /* Look for the "this" argument. */
15543 pfn_type = TYPE_TARGET_TYPE (pfn_type);
15544 if (TYPE_NFIELDS (pfn_type) == 0
15545 /* || TYPE_FIELD_TYPE (pfn_type, 0) == NULL */
15546 || TYPE_CODE (TYPE_FIELD_TYPE (pfn_type, 0)) != TYPE_CODE_PTR)
15549 self_type = TYPE_TARGET_TYPE (TYPE_FIELD_TYPE (pfn_type, 0));
15550 new_type = alloc_type (objfile);
15551 smash_to_method_type (new_type, self_type, TYPE_TARGET_TYPE (pfn_type),
15552 TYPE_FIELDS (pfn_type), TYPE_NFIELDS (pfn_type),
15553 TYPE_VARARGS (pfn_type));
15554 smash_to_methodptr_type (type, new_type);
15557 /* If the DIE has a DW_AT_alignment attribute, return its value, doing
15558 appropriate error checking and issuing complaints if there is a
15562 get_alignment (struct dwarf2_cu *cu, struct die_info *die)
15564 struct attribute *attr = dwarf2_attr (die, DW_AT_alignment, cu);
15566 if (attr == nullptr)
15569 if (!attr_form_is_constant (attr))
15571 complaint (_("DW_AT_alignment must have constant form"
15572 " - DIE at %s [in module %s]"),
15573 sect_offset_str (die->sect_off),
15574 objfile_name (cu->per_cu->dwarf2_per_objfile->objfile));
15579 if (attr->form == DW_FORM_sdata)
15581 LONGEST val = DW_SND (attr);
15584 complaint (_("DW_AT_alignment value must not be negative"
15585 " - DIE at %s [in module %s]"),
15586 sect_offset_str (die->sect_off),
15587 objfile_name (cu->per_cu->dwarf2_per_objfile->objfile));
15593 align = DW_UNSND (attr);
15597 complaint (_("DW_AT_alignment value must not be zero"
15598 " - DIE at %s [in module %s]"),
15599 sect_offset_str (die->sect_off),
15600 objfile_name (cu->per_cu->dwarf2_per_objfile->objfile));
15603 if ((align & (align - 1)) != 0)
15605 complaint (_("DW_AT_alignment value must be a power of 2"
15606 " - DIE at %s [in module %s]"),
15607 sect_offset_str (die->sect_off),
15608 objfile_name (cu->per_cu->dwarf2_per_objfile->objfile));
15615 /* If the DIE has a DW_AT_alignment attribute, use its value to set
15616 the alignment for TYPE. */
15619 maybe_set_alignment (struct dwarf2_cu *cu, struct die_info *die,
15622 if (!set_type_align (type, get_alignment (cu, die)))
15623 complaint (_("DW_AT_alignment value too large"
15624 " - DIE at %s [in module %s]"),
15625 sect_offset_str (die->sect_off),
15626 objfile_name (cu->per_cu->dwarf2_per_objfile->objfile));
15629 /* Called when we find the DIE that starts a structure or union scope
15630 (definition) to create a type for the structure or union. Fill in
15631 the type's name and general properties; the members will not be
15632 processed until process_structure_scope. A symbol table entry for
15633 the type will also not be done until process_structure_scope (assuming
15634 the type has a name).
15636 NOTE: we need to call these functions regardless of whether or not the
15637 DIE has a DW_AT_name attribute, since it might be an anonymous
15638 structure or union. This gets the type entered into our set of
15639 user defined types. */
15641 static struct type *
15642 read_structure_type (struct die_info *die, struct dwarf2_cu *cu)
15644 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
15646 struct attribute *attr;
15649 /* If the definition of this type lives in .debug_types, read that type.
15650 Don't follow DW_AT_specification though, that will take us back up
15651 the chain and we want to go down. */
15652 attr = dwarf2_attr_no_follow (die, DW_AT_signature);
15655 type = get_DW_AT_signature_type (die, attr, cu);
15657 /* The type's CU may not be the same as CU.
15658 Ensure TYPE is recorded with CU in die_type_hash. */
15659 return set_die_type (die, type, cu);
15662 type = alloc_type (objfile);
15663 INIT_CPLUS_SPECIFIC (type);
15665 name = dwarf2_name (die, cu);
15668 if (cu->language == language_cplus
15669 || cu->language == language_d
15670 || cu->language == language_rust)
15672 const char *full_name = dwarf2_full_name (name, die, cu);
15674 /* dwarf2_full_name might have already finished building the DIE's
15675 type. If so, there is no need to continue. */
15676 if (get_die_type (die, cu) != NULL)
15677 return get_die_type (die, cu);
15679 TYPE_NAME (type) = full_name;
15683 /* The name is already allocated along with this objfile, so
15684 we don't need to duplicate it for the type. */
15685 TYPE_NAME (type) = name;
15689 if (die->tag == DW_TAG_structure_type)
15691 TYPE_CODE (type) = TYPE_CODE_STRUCT;
15693 else if (die->tag == DW_TAG_union_type)
15695 TYPE_CODE (type) = TYPE_CODE_UNION;
15697 else if (die->tag == DW_TAG_variant_part)
15699 TYPE_CODE (type) = TYPE_CODE_UNION;
15700 TYPE_FLAG_DISCRIMINATED_UNION (type) = 1;
15704 TYPE_CODE (type) = TYPE_CODE_STRUCT;
15707 if (cu->language == language_cplus && die->tag == DW_TAG_class_type)
15708 TYPE_DECLARED_CLASS (type) = 1;
15710 attr = dwarf2_attr (die, DW_AT_byte_size, cu);
15713 if (attr_form_is_constant (attr))
15714 TYPE_LENGTH (type) = DW_UNSND (attr);
15717 /* For the moment, dynamic type sizes are not supported
15718 by GDB's struct type. The actual size is determined
15719 on-demand when resolving the type of a given object,
15720 so set the type's length to zero for now. Otherwise,
15721 we record an expression as the length, and that expression
15722 could lead to a very large value, which could eventually
15723 lead to us trying to allocate that much memory when creating
15724 a value of that type. */
15725 TYPE_LENGTH (type) = 0;
15730 TYPE_LENGTH (type) = 0;
15733 maybe_set_alignment (cu, die, type);
15735 if (producer_is_icc_lt_14 (cu) && (TYPE_LENGTH (type) == 0))
15737 /* ICC<14 does not output the required DW_AT_declaration on
15738 incomplete types, but gives them a size of zero. */
15739 TYPE_STUB (type) = 1;
15742 TYPE_STUB_SUPPORTED (type) = 1;
15744 if (die_is_declaration (die, cu))
15745 TYPE_STUB (type) = 1;
15746 else if (attr == NULL && die->child == NULL
15747 && producer_is_realview (cu->producer))
15748 /* RealView does not output the required DW_AT_declaration
15749 on incomplete types. */
15750 TYPE_STUB (type) = 1;
15752 /* We need to add the type field to the die immediately so we don't
15753 infinitely recurse when dealing with pointers to the structure
15754 type within the structure itself. */
15755 set_die_type (die, type, cu);
15757 /* set_die_type should be already done. */
15758 set_descriptive_type (type, die, cu);
15763 /* A helper for process_structure_scope that handles a single member
15767 handle_struct_member_die (struct die_info *child_die, struct type *type,
15768 struct field_info *fi,
15769 std::vector<struct symbol *> *template_args,
15770 struct dwarf2_cu *cu)
15772 if (child_die->tag == DW_TAG_member
15773 || child_die->tag == DW_TAG_variable
15774 || child_die->tag == DW_TAG_variant_part)
15776 /* NOTE: carlton/2002-11-05: A C++ static data member
15777 should be a DW_TAG_member that is a declaration, but
15778 all versions of G++ as of this writing (so through at
15779 least 3.2.1) incorrectly generate DW_TAG_variable
15780 tags for them instead. */
15781 dwarf2_add_field (fi, child_die, cu);
15783 else if (child_die->tag == DW_TAG_subprogram)
15785 /* Rust doesn't have member functions in the C++ sense.
15786 However, it does emit ordinary functions as children
15787 of a struct DIE. */
15788 if (cu->language == language_rust)
15789 read_func_scope (child_die, cu);
15792 /* C++ member function. */
15793 dwarf2_add_member_fn (fi, child_die, type, cu);
15796 else if (child_die->tag == DW_TAG_inheritance)
15798 /* C++ base class field. */
15799 dwarf2_add_field (fi, child_die, cu);
15801 else if (type_can_define_types (child_die))
15802 dwarf2_add_type_defn (fi, child_die, cu);
15803 else if (child_die->tag == DW_TAG_template_type_param
15804 || child_die->tag == DW_TAG_template_value_param)
15806 struct symbol *arg = new_symbol (child_die, NULL, cu);
15809 template_args->push_back (arg);
15811 else if (child_die->tag == DW_TAG_variant)
15813 /* In a variant we want to get the discriminant and also add a
15814 field for our sole member child. */
15815 struct attribute *discr = dwarf2_attr (child_die, DW_AT_discr_value, cu);
15817 for (struct die_info *variant_child = child_die->child;
15818 variant_child != NULL;
15819 variant_child = sibling_die (variant_child))
15821 if (variant_child->tag == DW_TAG_member)
15823 handle_struct_member_die (variant_child, type, fi,
15824 template_args, cu);
15825 /* Only handle the one. */
15830 /* We don't handle this but we might as well report it if we see
15832 if (dwarf2_attr (child_die, DW_AT_discr_list, cu) != nullptr)
15833 complaint (_("DW_AT_discr_list is not supported yet"
15834 " - DIE at %s [in module %s]"),
15835 sect_offset_str (child_die->sect_off),
15836 objfile_name (cu->per_cu->dwarf2_per_objfile->objfile));
15838 /* The first field was just added, so we can stash the
15839 discriminant there. */
15840 gdb_assert (!fi->fields.empty ());
15842 fi->fields.back ().variant.default_branch = true;
15844 fi->fields.back ().variant.discriminant_value = DW_UNSND (discr);
15848 /* Finish creating a structure or union type, including filling in
15849 its members and creating a symbol for it. */
15852 process_structure_scope (struct die_info *die, struct dwarf2_cu *cu)
15854 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
15855 struct die_info *child_die;
15858 type = get_die_type (die, cu);
15860 type = read_structure_type (die, cu);
15862 /* When reading a DW_TAG_variant_part, we need to notice when we
15863 read the discriminant member, so we can record it later in the
15864 discriminant_info. */
15865 bool is_variant_part = TYPE_FLAG_DISCRIMINATED_UNION (type);
15866 sect_offset discr_offset;
15868 if (is_variant_part)
15870 struct attribute *discr = dwarf2_attr (die, DW_AT_discr, cu);
15873 /* Maybe it's a univariant form, an extension we support.
15874 In this case arrange not to check the offset. */
15875 is_variant_part = false;
15877 else if (attr_form_is_ref (discr))
15879 struct dwarf2_cu *target_cu = cu;
15880 struct die_info *target_die = follow_die_ref (die, discr, &target_cu);
15882 discr_offset = target_die->sect_off;
15886 complaint (_("DW_AT_discr does not have DIE reference form"
15887 " - DIE at %s [in module %s]"),
15888 sect_offset_str (die->sect_off),
15889 objfile_name (cu->per_cu->dwarf2_per_objfile->objfile));
15890 is_variant_part = false;
15894 if (die->child != NULL && ! die_is_declaration (die, cu))
15896 struct field_info fi;
15897 std::vector<struct symbol *> template_args;
15899 child_die = die->child;
15901 while (child_die && child_die->tag)
15903 handle_struct_member_die (child_die, type, &fi, &template_args, cu);
15905 if (is_variant_part && discr_offset == child_die->sect_off)
15906 fi.fields.back ().variant.is_discriminant = true;
15908 child_die = sibling_die (child_die);
15911 /* Attach template arguments to type. */
15912 if (!template_args.empty ())
15914 ALLOCATE_CPLUS_STRUCT_TYPE (type);
15915 TYPE_N_TEMPLATE_ARGUMENTS (type) = template_args.size ();
15916 TYPE_TEMPLATE_ARGUMENTS (type)
15917 = XOBNEWVEC (&objfile->objfile_obstack,
15919 TYPE_N_TEMPLATE_ARGUMENTS (type));
15920 memcpy (TYPE_TEMPLATE_ARGUMENTS (type),
15921 template_args.data (),
15922 (TYPE_N_TEMPLATE_ARGUMENTS (type)
15923 * sizeof (struct symbol *)));
15926 /* Attach fields and member functions to the type. */
15928 dwarf2_attach_fields_to_type (&fi, type, cu);
15929 if (!fi.fnfieldlists.empty ())
15931 dwarf2_attach_fn_fields_to_type (&fi, type, cu);
15933 /* Get the type which refers to the base class (possibly this
15934 class itself) which contains the vtable pointer for the current
15935 class from the DW_AT_containing_type attribute. This use of
15936 DW_AT_containing_type is a GNU extension. */
15938 if (dwarf2_attr (die, DW_AT_containing_type, cu) != NULL)
15940 struct type *t = die_containing_type (die, cu);
15942 set_type_vptr_basetype (type, t);
15947 /* Our own class provides vtbl ptr. */
15948 for (i = TYPE_NFIELDS (t) - 1;
15949 i >= TYPE_N_BASECLASSES (t);
15952 const char *fieldname = TYPE_FIELD_NAME (t, i);
15954 if (is_vtable_name (fieldname, cu))
15956 set_type_vptr_fieldno (type, i);
15961 /* Complain if virtual function table field not found. */
15962 if (i < TYPE_N_BASECLASSES (t))
15963 complaint (_("virtual function table pointer "
15964 "not found when defining class '%s'"),
15965 TYPE_NAME (type) ? TYPE_NAME (type) : "");
15969 set_type_vptr_fieldno (type, TYPE_VPTR_FIELDNO (t));
15972 else if (cu->producer
15973 && startswith (cu->producer, "IBM(R) XL C/C++ Advanced Edition"))
15975 /* The IBM XLC compiler does not provide direct indication
15976 of the containing type, but the vtable pointer is
15977 always named __vfp. */
15981 for (i = TYPE_NFIELDS (type) - 1;
15982 i >= TYPE_N_BASECLASSES (type);
15985 if (strcmp (TYPE_FIELD_NAME (type, i), "__vfp") == 0)
15987 set_type_vptr_fieldno (type, i);
15988 set_type_vptr_basetype (type, type);
15995 /* Copy fi.typedef_field_list linked list elements content into the
15996 allocated array TYPE_TYPEDEF_FIELD_ARRAY (type). */
15997 if (!fi.typedef_field_list.empty ())
15999 int count = fi.typedef_field_list.size ();
16001 ALLOCATE_CPLUS_STRUCT_TYPE (type);
16002 TYPE_TYPEDEF_FIELD_ARRAY (type)
16003 = ((struct decl_field *)
16005 sizeof (TYPE_TYPEDEF_FIELD (type, 0)) * count));
16006 TYPE_TYPEDEF_FIELD_COUNT (type) = count;
16008 for (int i = 0; i < fi.typedef_field_list.size (); ++i)
16009 TYPE_TYPEDEF_FIELD (type, i) = fi.typedef_field_list[i];
16012 /* Copy fi.nested_types_list linked list elements content into the
16013 allocated array TYPE_NESTED_TYPES_ARRAY (type). */
16014 if (!fi.nested_types_list.empty () && cu->language != language_ada)
16016 int count = fi.nested_types_list.size ();
16018 ALLOCATE_CPLUS_STRUCT_TYPE (type);
16019 TYPE_NESTED_TYPES_ARRAY (type)
16020 = ((struct decl_field *)
16021 TYPE_ALLOC (type, sizeof (struct decl_field) * count));
16022 TYPE_NESTED_TYPES_COUNT (type) = count;
16024 for (int i = 0; i < fi.nested_types_list.size (); ++i)
16025 TYPE_NESTED_TYPES_FIELD (type, i) = fi.nested_types_list[i];
16029 quirk_gcc_member_function_pointer (type, objfile);
16030 if (cu->language == language_rust && die->tag == DW_TAG_union_type)
16031 cu->rust_unions.push_back (type);
16033 /* NOTE: carlton/2004-03-16: GCC 3.4 (or at least one of its
16034 snapshots) has been known to create a die giving a declaration
16035 for a class that has, as a child, a die giving a definition for a
16036 nested class. So we have to process our children even if the
16037 current die is a declaration. Normally, of course, a declaration
16038 won't have any children at all. */
16040 child_die = die->child;
16042 while (child_die != NULL && child_die->tag)
16044 if (child_die->tag == DW_TAG_member
16045 || child_die->tag == DW_TAG_variable
16046 || child_die->tag == DW_TAG_inheritance
16047 || child_die->tag == DW_TAG_template_value_param
16048 || child_die->tag == DW_TAG_template_type_param)
16053 process_die (child_die, cu);
16055 child_die = sibling_die (child_die);
16058 /* Do not consider external references. According to the DWARF standard,
16059 these DIEs are identified by the fact that they have no byte_size
16060 attribute, and a declaration attribute. */
16061 if (dwarf2_attr (die, DW_AT_byte_size, cu) != NULL
16062 || !die_is_declaration (die, cu))
16063 new_symbol (die, type, cu);
16066 /* Assuming DIE is an enumeration type, and TYPE is its associated type,
16067 update TYPE using some information only available in DIE's children. */
16070 update_enumeration_type_from_children (struct die_info *die,
16072 struct dwarf2_cu *cu)
16074 struct die_info *child_die;
16075 int unsigned_enum = 1;
16079 auto_obstack obstack;
16081 for (child_die = die->child;
16082 child_die != NULL && child_die->tag;
16083 child_die = sibling_die (child_die))
16085 struct attribute *attr;
16087 const gdb_byte *bytes;
16088 struct dwarf2_locexpr_baton *baton;
16091 if (child_die->tag != DW_TAG_enumerator)
16094 attr = dwarf2_attr (child_die, DW_AT_const_value, cu);
16098 name = dwarf2_name (child_die, cu);
16100 name = "<anonymous enumerator>";
16102 dwarf2_const_value_attr (attr, type, name, &obstack, cu,
16103 &value, &bytes, &baton);
16109 else if ((mask & value) != 0)
16114 /* If we already know that the enum type is neither unsigned, nor
16115 a flag type, no need to look at the rest of the enumerates. */
16116 if (!unsigned_enum && !flag_enum)
16121 TYPE_UNSIGNED (type) = 1;
16123 TYPE_FLAG_ENUM (type) = 1;
16126 /* Given a DW_AT_enumeration_type die, set its type. We do not
16127 complete the type's fields yet, or create any symbols. */
16129 static struct type *
16130 read_enumeration_type (struct die_info *die, struct dwarf2_cu *cu)
16132 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
16134 struct attribute *attr;
16137 /* If the definition of this type lives in .debug_types, read that type.
16138 Don't follow DW_AT_specification though, that will take us back up
16139 the chain and we want to go down. */
16140 attr = dwarf2_attr_no_follow (die, DW_AT_signature);
16143 type = get_DW_AT_signature_type (die, attr, cu);
16145 /* The type's CU may not be the same as CU.
16146 Ensure TYPE is recorded with CU in die_type_hash. */
16147 return set_die_type (die, type, cu);
16150 type = alloc_type (objfile);
16152 TYPE_CODE (type) = TYPE_CODE_ENUM;
16153 name = dwarf2_full_name (NULL, die, cu);
16155 TYPE_NAME (type) = name;
16157 attr = dwarf2_attr (die, DW_AT_type, cu);
16160 struct type *underlying_type = die_type (die, cu);
16162 TYPE_TARGET_TYPE (type) = underlying_type;
16165 attr = dwarf2_attr (die, DW_AT_byte_size, cu);
16168 TYPE_LENGTH (type) = DW_UNSND (attr);
16172 TYPE_LENGTH (type) = 0;
16175 maybe_set_alignment (cu, die, type);
16177 /* The enumeration DIE can be incomplete. In Ada, any type can be
16178 declared as private in the package spec, and then defined only
16179 inside the package body. Such types are known as Taft Amendment
16180 Types. When another package uses such a type, an incomplete DIE
16181 may be generated by the compiler. */
16182 if (die_is_declaration (die, cu))
16183 TYPE_STUB (type) = 1;
16185 /* Finish the creation of this type by using the enum's children.
16186 We must call this even when the underlying type has been provided
16187 so that we can determine if we're looking at a "flag" enum. */
16188 update_enumeration_type_from_children (die, type, cu);
16190 /* If this type has an underlying type that is not a stub, then we
16191 may use its attributes. We always use the "unsigned" attribute
16192 in this situation, because ordinarily we guess whether the type
16193 is unsigned -- but the guess can be wrong and the underlying type
16194 can tell us the reality. However, we defer to a local size
16195 attribute if one exists, because this lets the compiler override
16196 the underlying type if needed. */
16197 if (TYPE_TARGET_TYPE (type) != NULL && !TYPE_STUB (TYPE_TARGET_TYPE (type)))
16199 TYPE_UNSIGNED (type) = TYPE_UNSIGNED (TYPE_TARGET_TYPE (type));
16200 if (TYPE_LENGTH (type) == 0)
16201 TYPE_LENGTH (type) = TYPE_LENGTH (TYPE_TARGET_TYPE (type));
16202 if (TYPE_RAW_ALIGN (type) == 0
16203 && TYPE_RAW_ALIGN (TYPE_TARGET_TYPE (type)) != 0)
16204 set_type_align (type, TYPE_RAW_ALIGN (TYPE_TARGET_TYPE (type)));
16207 TYPE_DECLARED_CLASS (type) = dwarf2_flag_true_p (die, DW_AT_enum_class, cu);
16209 return set_die_type (die, type, cu);
16212 /* Given a pointer to a die which begins an enumeration, process all
16213 the dies that define the members of the enumeration, and create the
16214 symbol for the enumeration type.
16216 NOTE: We reverse the order of the element list. */
16219 process_enumeration_scope (struct die_info *die, struct dwarf2_cu *cu)
16221 struct type *this_type;
16223 this_type = get_die_type (die, cu);
16224 if (this_type == NULL)
16225 this_type = read_enumeration_type (die, cu);
16227 if (die->child != NULL)
16229 struct die_info *child_die;
16230 struct symbol *sym;
16231 struct field *fields = NULL;
16232 int num_fields = 0;
16235 child_die = die->child;
16236 while (child_die && child_die->tag)
16238 if (child_die->tag != DW_TAG_enumerator)
16240 process_die (child_die, cu);
16244 name = dwarf2_name (child_die, cu);
16247 sym = new_symbol (child_die, this_type, cu);
16249 if ((num_fields % DW_FIELD_ALLOC_CHUNK) == 0)
16251 fields = (struct field *)
16253 (num_fields + DW_FIELD_ALLOC_CHUNK)
16254 * sizeof (struct field));
16257 FIELD_NAME (fields[num_fields]) = SYMBOL_LINKAGE_NAME (sym);
16258 FIELD_TYPE (fields[num_fields]) = NULL;
16259 SET_FIELD_ENUMVAL (fields[num_fields], SYMBOL_VALUE (sym));
16260 FIELD_BITSIZE (fields[num_fields]) = 0;
16266 child_die = sibling_die (child_die);
16271 TYPE_NFIELDS (this_type) = num_fields;
16272 TYPE_FIELDS (this_type) = (struct field *)
16273 TYPE_ALLOC (this_type, sizeof (struct field) * num_fields);
16274 memcpy (TYPE_FIELDS (this_type), fields,
16275 sizeof (struct field) * num_fields);
16280 /* If we are reading an enum from a .debug_types unit, and the enum
16281 is a declaration, and the enum is not the signatured type in the
16282 unit, then we do not want to add a symbol for it. Adding a
16283 symbol would in some cases obscure the true definition of the
16284 enum, giving users an incomplete type when the definition is
16285 actually available. Note that we do not want to do this for all
16286 enums which are just declarations, because C++0x allows forward
16287 enum declarations. */
16288 if (cu->per_cu->is_debug_types
16289 && die_is_declaration (die, cu))
16291 struct signatured_type *sig_type;
16293 sig_type = (struct signatured_type *) cu->per_cu;
16294 gdb_assert (to_underlying (sig_type->type_offset_in_section) != 0);
16295 if (sig_type->type_offset_in_section != die->sect_off)
16299 new_symbol (die, this_type, cu);
16302 /* Extract all information from a DW_TAG_array_type DIE and put it in
16303 the DIE's type field. For now, this only handles one dimensional
16306 static struct type *
16307 read_array_type (struct die_info *die, struct dwarf2_cu *cu)
16309 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
16310 struct die_info *child_die;
16312 struct type *element_type, *range_type, *index_type;
16313 struct attribute *attr;
16315 struct dynamic_prop *byte_stride_prop = NULL;
16316 unsigned int bit_stride = 0;
16318 element_type = die_type (die, cu);
16320 /* The die_type call above may have already set the type for this DIE. */
16321 type = get_die_type (die, cu);
16325 attr = dwarf2_attr (die, DW_AT_byte_stride, cu);
16331 = (struct dynamic_prop *) alloca (sizeof (struct dynamic_prop));
16332 stride_ok = attr_to_dynamic_prop (attr, die, cu, byte_stride_prop);
16335 complaint (_("unable to read array DW_AT_byte_stride "
16336 " - DIE at %s [in module %s]"),
16337 sect_offset_str (die->sect_off),
16338 objfile_name (cu->per_cu->dwarf2_per_objfile->objfile));
16339 /* Ignore this attribute. We will likely not be able to print
16340 arrays of this type correctly, but there is little we can do
16341 to help if we cannot read the attribute's value. */
16342 byte_stride_prop = NULL;
16346 attr = dwarf2_attr (die, DW_AT_bit_stride, cu);
16348 bit_stride = DW_UNSND (attr);
16350 /* Irix 6.2 native cc creates array types without children for
16351 arrays with unspecified length. */
16352 if (die->child == NULL)
16354 index_type = objfile_type (objfile)->builtin_int;
16355 range_type = create_static_range_type (NULL, index_type, 0, -1);
16356 type = create_array_type_with_stride (NULL, element_type, range_type,
16357 byte_stride_prop, bit_stride);
16358 return set_die_type (die, type, cu);
16361 std::vector<struct type *> range_types;
16362 child_die = die->child;
16363 while (child_die && child_die->tag)
16365 if (child_die->tag == DW_TAG_subrange_type)
16367 struct type *child_type = read_type_die (child_die, cu);
16369 if (child_type != NULL)
16371 /* The range type was succesfully read. Save it for the
16372 array type creation. */
16373 range_types.push_back (child_type);
16376 child_die = sibling_die (child_die);
16379 /* Dwarf2 dimensions are output from left to right, create the
16380 necessary array types in backwards order. */
16382 type = element_type;
16384 if (read_array_order (die, cu) == DW_ORD_col_major)
16388 while (i < range_types.size ())
16389 type = create_array_type_with_stride (NULL, type, range_types[i++],
16390 byte_stride_prop, bit_stride);
16394 size_t ndim = range_types.size ();
16396 type = create_array_type_with_stride (NULL, type, range_types[ndim],
16397 byte_stride_prop, bit_stride);
16400 /* Understand Dwarf2 support for vector types (like they occur on
16401 the PowerPC w/ AltiVec). Gcc just adds another attribute to the
16402 array type. This is not part of the Dwarf2/3 standard yet, but a
16403 custom vendor extension. The main difference between a regular
16404 array and the vector variant is that vectors are passed by value
16406 attr = dwarf2_attr (die, DW_AT_GNU_vector, cu);
16408 make_vector_type (type);
16410 /* The DIE may have DW_AT_byte_size set. For example an OpenCL
16411 implementation may choose to implement triple vectors using this
16413 attr = dwarf2_attr (die, DW_AT_byte_size, cu);
16416 if (DW_UNSND (attr) >= TYPE_LENGTH (type))
16417 TYPE_LENGTH (type) = DW_UNSND (attr);
16419 complaint (_("DW_AT_byte_size for array type smaller "
16420 "than the total size of elements"));
16423 name = dwarf2_name (die, cu);
16425 TYPE_NAME (type) = name;
16427 maybe_set_alignment (cu, die, type);
16429 /* Install the type in the die. */
16430 set_die_type (die, type, cu);
16432 /* set_die_type should be already done. */
16433 set_descriptive_type (type, die, cu);
16438 static enum dwarf_array_dim_ordering
16439 read_array_order (struct die_info *die, struct dwarf2_cu *cu)
16441 struct attribute *attr;
16443 attr = dwarf2_attr (die, DW_AT_ordering, cu);
16446 return (enum dwarf_array_dim_ordering) DW_SND (attr);
16448 /* GNU F77 is a special case, as at 08/2004 array type info is the
16449 opposite order to the dwarf2 specification, but data is still
16450 laid out as per normal fortran.
16452 FIXME: dsl/2004-8-20: If G77 is ever fixed, this will also need
16453 version checking. */
16455 if (cu->language == language_fortran
16456 && cu->producer && strstr (cu->producer, "GNU F77"))
16458 return DW_ORD_row_major;
16461 switch (cu->language_defn->la_array_ordering)
16463 case array_column_major:
16464 return DW_ORD_col_major;
16465 case array_row_major:
16467 return DW_ORD_row_major;
16471 /* Extract all information from a DW_TAG_set_type DIE and put it in
16472 the DIE's type field. */
16474 static struct type *
16475 read_set_type (struct die_info *die, struct dwarf2_cu *cu)
16477 struct type *domain_type, *set_type;
16478 struct attribute *attr;
16480 domain_type = die_type (die, cu);
16482 /* The die_type call above may have already set the type for this DIE. */
16483 set_type = get_die_type (die, cu);
16487 set_type = create_set_type (NULL, domain_type);
16489 attr = dwarf2_attr (die, DW_AT_byte_size, cu);
16491 TYPE_LENGTH (set_type) = DW_UNSND (attr);
16493 maybe_set_alignment (cu, die, set_type);
16495 return set_die_type (die, set_type, cu);
16498 /* A helper for read_common_block that creates a locexpr baton.
16499 SYM is the symbol which we are marking as computed.
16500 COMMON_DIE is the DIE for the common block.
16501 COMMON_LOC is the location expression attribute for the common
16503 MEMBER_LOC is the location expression attribute for the particular
16504 member of the common block that we are processing.
16505 CU is the CU from which the above come. */
16508 mark_common_block_symbol_computed (struct symbol *sym,
16509 struct die_info *common_die,
16510 struct attribute *common_loc,
16511 struct attribute *member_loc,
16512 struct dwarf2_cu *cu)
16514 struct dwarf2_per_objfile *dwarf2_per_objfile
16515 = cu->per_cu->dwarf2_per_objfile;
16516 struct objfile *objfile = dwarf2_per_objfile->objfile;
16517 struct dwarf2_locexpr_baton *baton;
16519 unsigned int cu_off;
16520 enum bfd_endian byte_order = gdbarch_byte_order (get_objfile_arch (objfile));
16521 LONGEST offset = 0;
16523 gdb_assert (common_loc && member_loc);
16524 gdb_assert (attr_form_is_block (common_loc));
16525 gdb_assert (attr_form_is_block (member_loc)
16526 || attr_form_is_constant (member_loc));
16528 baton = XOBNEW (&objfile->objfile_obstack, struct dwarf2_locexpr_baton);
16529 baton->per_cu = cu->per_cu;
16530 gdb_assert (baton->per_cu);
16532 baton->size = 5 /* DW_OP_call4 */ + 1 /* DW_OP_plus */;
16534 if (attr_form_is_constant (member_loc))
16536 offset = dwarf2_get_attr_constant_value (member_loc, 0);
16537 baton->size += 1 /* DW_OP_addr */ + cu->header.addr_size;
16540 baton->size += DW_BLOCK (member_loc)->size;
16542 ptr = (gdb_byte *) obstack_alloc (&objfile->objfile_obstack, baton->size);
16545 *ptr++ = DW_OP_call4;
16546 cu_off = common_die->sect_off - cu->per_cu->sect_off;
16547 store_unsigned_integer (ptr, 4, byte_order, cu_off);
16550 if (attr_form_is_constant (member_loc))
16552 *ptr++ = DW_OP_addr;
16553 store_unsigned_integer (ptr, cu->header.addr_size, byte_order, offset);
16554 ptr += cu->header.addr_size;
16558 /* We have to copy the data here, because DW_OP_call4 will only
16559 use a DW_AT_location attribute. */
16560 memcpy (ptr, DW_BLOCK (member_loc)->data, DW_BLOCK (member_loc)->size);
16561 ptr += DW_BLOCK (member_loc)->size;
16564 *ptr++ = DW_OP_plus;
16565 gdb_assert (ptr - baton->data == baton->size);
16567 SYMBOL_LOCATION_BATON (sym) = baton;
16568 SYMBOL_ACLASS_INDEX (sym) = dwarf2_locexpr_index;
16571 /* Create appropriate locally-scoped variables for all the
16572 DW_TAG_common_block entries. Also create a struct common_block
16573 listing all such variables for `info common'. COMMON_BLOCK_DOMAIN
16574 is used to sepate the common blocks name namespace from regular
16578 read_common_block (struct die_info *die, struct dwarf2_cu *cu)
16580 struct attribute *attr;
16582 attr = dwarf2_attr (die, DW_AT_location, cu);
16585 /* Support the .debug_loc offsets. */
16586 if (attr_form_is_block (attr))
16590 else if (attr_form_is_section_offset (attr))
16592 dwarf2_complex_location_expr_complaint ();
16597 dwarf2_invalid_attrib_class_complaint ("DW_AT_location",
16598 "common block member");
16603 if (die->child != NULL)
16605 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
16606 struct die_info *child_die;
16607 size_t n_entries = 0, size;
16608 struct common_block *common_block;
16609 struct symbol *sym;
16611 for (child_die = die->child;
16612 child_die && child_die->tag;
16613 child_die = sibling_die (child_die))
16616 size = (sizeof (struct common_block)
16617 + (n_entries - 1) * sizeof (struct symbol *));
16619 = (struct common_block *) obstack_alloc (&objfile->objfile_obstack,
16621 memset (common_block->contents, 0, n_entries * sizeof (struct symbol *));
16622 common_block->n_entries = 0;
16624 for (child_die = die->child;
16625 child_die && child_die->tag;
16626 child_die = sibling_die (child_die))
16628 /* Create the symbol in the DW_TAG_common_block block in the current
16630 sym = new_symbol (child_die, NULL, cu);
16633 struct attribute *member_loc;
16635 common_block->contents[common_block->n_entries++] = sym;
16637 member_loc = dwarf2_attr (child_die, DW_AT_data_member_location,
16641 /* GDB has handled this for a long time, but it is
16642 not specified by DWARF. It seems to have been
16643 emitted by gfortran at least as recently as:
16644 http://gcc.gnu.org/bugzilla/show_bug.cgi?id=23057. */
16645 complaint (_("Variable in common block has "
16646 "DW_AT_data_member_location "
16647 "- DIE at %s [in module %s]"),
16648 sect_offset_str (child_die->sect_off),
16649 objfile_name (objfile));
16651 if (attr_form_is_section_offset (member_loc))
16652 dwarf2_complex_location_expr_complaint ();
16653 else if (attr_form_is_constant (member_loc)
16654 || attr_form_is_block (member_loc))
16657 mark_common_block_symbol_computed (sym, die, attr,
16661 dwarf2_complex_location_expr_complaint ();
16666 sym = new_symbol (die, objfile_type (objfile)->builtin_void, cu);
16667 SYMBOL_VALUE_COMMON_BLOCK (sym) = common_block;
16671 /* Create a type for a C++ namespace. */
16673 static struct type *
16674 read_namespace_type (struct die_info *die, struct dwarf2_cu *cu)
16676 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
16677 const char *previous_prefix, *name;
16681 /* For extensions, reuse the type of the original namespace. */
16682 if (dwarf2_attr (die, DW_AT_extension, cu) != NULL)
16684 struct die_info *ext_die;
16685 struct dwarf2_cu *ext_cu = cu;
16687 ext_die = dwarf2_extension (die, &ext_cu);
16688 type = read_type_die (ext_die, ext_cu);
16690 /* EXT_CU may not be the same as CU.
16691 Ensure TYPE is recorded with CU in die_type_hash. */
16692 return set_die_type (die, type, cu);
16695 name = namespace_name (die, &is_anonymous, cu);
16697 /* Now build the name of the current namespace. */
16699 previous_prefix = determine_prefix (die, cu);
16700 if (previous_prefix[0] != '\0')
16701 name = typename_concat (&objfile->objfile_obstack,
16702 previous_prefix, name, 0, cu);
16704 /* Create the type. */
16705 type = init_type (objfile, TYPE_CODE_NAMESPACE, 0, name);
16707 return set_die_type (die, type, cu);
16710 /* Read a namespace scope. */
16713 read_namespace (struct die_info *die, struct dwarf2_cu *cu)
16715 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
16718 /* Add a symbol associated to this if we haven't seen the namespace
16719 before. Also, add a using directive if it's an anonymous
16722 if (dwarf2_attr (die, DW_AT_extension, cu) == NULL)
16726 type = read_type_die (die, cu);
16727 new_symbol (die, type, cu);
16729 namespace_name (die, &is_anonymous, cu);
16732 const char *previous_prefix = determine_prefix (die, cu);
16734 std::vector<const char *> excludes;
16735 add_using_directive (using_directives (cu->language),
16736 previous_prefix, TYPE_NAME (type), NULL,
16737 NULL, excludes, 0, &objfile->objfile_obstack);
16741 if (die->child != NULL)
16743 struct die_info *child_die = die->child;
16745 while (child_die && child_die->tag)
16747 process_die (child_die, cu);
16748 child_die = sibling_die (child_die);
16753 /* Read a Fortran module as type. This DIE can be only a declaration used for
16754 imported module. Still we need that type as local Fortran "use ... only"
16755 declaration imports depend on the created type in determine_prefix. */
16757 static struct type *
16758 read_module_type (struct die_info *die, struct dwarf2_cu *cu)
16760 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
16761 const char *module_name;
16764 module_name = dwarf2_name (die, cu);
16766 complaint (_("DW_TAG_module has no name, offset %s"),
16767 sect_offset_str (die->sect_off));
16768 type = init_type (objfile, TYPE_CODE_MODULE, 0, module_name);
16770 return set_die_type (die, type, cu);
16773 /* Read a Fortran module. */
16776 read_module (struct die_info *die, struct dwarf2_cu *cu)
16778 struct die_info *child_die = die->child;
16781 type = read_type_die (die, cu);
16782 new_symbol (die, type, cu);
16784 while (child_die && child_die->tag)
16786 process_die (child_die, cu);
16787 child_die = sibling_die (child_die);
16791 /* Return the name of the namespace represented by DIE. Set
16792 *IS_ANONYMOUS to tell whether or not the namespace is an anonymous
16795 static const char *
16796 namespace_name (struct die_info *die, int *is_anonymous, struct dwarf2_cu *cu)
16798 struct die_info *current_die;
16799 const char *name = NULL;
16801 /* Loop through the extensions until we find a name. */
16803 for (current_die = die;
16804 current_die != NULL;
16805 current_die = dwarf2_extension (die, &cu))
16807 /* We don't use dwarf2_name here so that we can detect the absence
16808 of a name -> anonymous namespace. */
16809 name = dwarf2_string_attr (die, DW_AT_name, cu);
16815 /* Is it an anonymous namespace? */
16817 *is_anonymous = (name == NULL);
16819 name = CP_ANONYMOUS_NAMESPACE_STR;
16824 /* Extract all information from a DW_TAG_pointer_type DIE and add to
16825 the user defined type vector. */
16827 static struct type *
16828 read_tag_pointer_type (struct die_info *die, struct dwarf2_cu *cu)
16830 struct gdbarch *gdbarch
16831 = get_objfile_arch (cu->per_cu->dwarf2_per_objfile->objfile);
16832 struct comp_unit_head *cu_header = &cu->header;
16834 struct attribute *attr_byte_size;
16835 struct attribute *attr_address_class;
16836 int byte_size, addr_class;
16837 struct type *target_type;
16839 target_type = die_type (die, cu);
16841 /* The die_type call above may have already set the type for this DIE. */
16842 type = get_die_type (die, cu);
16846 type = lookup_pointer_type (target_type);
16848 attr_byte_size = dwarf2_attr (die, DW_AT_byte_size, cu);
16849 if (attr_byte_size)
16850 byte_size = DW_UNSND (attr_byte_size);
16852 byte_size = cu_header->addr_size;
16854 attr_address_class = dwarf2_attr (die, DW_AT_address_class, cu);
16855 if (attr_address_class)
16856 addr_class = DW_UNSND (attr_address_class);
16858 addr_class = DW_ADDR_none;
16860 ULONGEST alignment = get_alignment (cu, die);
16862 /* If the pointer size, alignment, or address class is different
16863 than the default, create a type variant marked as such and set
16864 the length accordingly. */
16865 if (TYPE_LENGTH (type) != byte_size
16866 || (alignment != 0 && TYPE_RAW_ALIGN (type) != 0
16867 && alignment != TYPE_RAW_ALIGN (type))
16868 || addr_class != DW_ADDR_none)
16870 if (gdbarch_address_class_type_flags_p (gdbarch))
16874 type_flags = gdbarch_address_class_type_flags
16875 (gdbarch, byte_size, addr_class);
16876 gdb_assert ((type_flags & ~TYPE_INSTANCE_FLAG_ADDRESS_CLASS_ALL)
16878 type = make_type_with_address_space (type, type_flags);
16880 else if (TYPE_LENGTH (type) != byte_size)
16882 complaint (_("invalid pointer size %d"), byte_size);
16884 else if (TYPE_RAW_ALIGN (type) != alignment)
16886 complaint (_("Invalid DW_AT_alignment"
16887 " - DIE at %s [in module %s]"),
16888 sect_offset_str (die->sect_off),
16889 objfile_name (cu->per_cu->dwarf2_per_objfile->objfile));
16893 /* Should we also complain about unhandled address classes? */
16897 TYPE_LENGTH (type) = byte_size;
16898 set_type_align (type, alignment);
16899 return set_die_type (die, type, cu);
16902 /* Extract all information from a DW_TAG_ptr_to_member_type DIE and add to
16903 the user defined type vector. */
16905 static struct type *
16906 read_tag_ptr_to_member_type (struct die_info *die, struct dwarf2_cu *cu)
16909 struct type *to_type;
16910 struct type *domain;
16912 to_type = die_type (die, cu);
16913 domain = die_containing_type (die, cu);
16915 /* The calls above may have already set the type for this DIE. */
16916 type = get_die_type (die, cu);
16920 if (TYPE_CODE (check_typedef (to_type)) == TYPE_CODE_METHOD)
16921 type = lookup_methodptr_type (to_type);
16922 else if (TYPE_CODE (check_typedef (to_type)) == TYPE_CODE_FUNC)
16924 struct type *new_type
16925 = alloc_type (cu->per_cu->dwarf2_per_objfile->objfile);
16927 smash_to_method_type (new_type, domain, TYPE_TARGET_TYPE (to_type),
16928 TYPE_FIELDS (to_type), TYPE_NFIELDS (to_type),
16929 TYPE_VARARGS (to_type));
16930 type = lookup_methodptr_type (new_type);
16933 type = lookup_memberptr_type (to_type, domain);
16935 return set_die_type (die, type, cu);
16938 /* Extract all information from a DW_TAG_{rvalue_,}reference_type DIE and add to
16939 the user defined type vector. */
16941 static struct type *
16942 read_tag_reference_type (struct die_info *die, struct dwarf2_cu *cu,
16943 enum type_code refcode)
16945 struct comp_unit_head *cu_header = &cu->header;
16946 struct type *type, *target_type;
16947 struct attribute *attr;
16949 gdb_assert (refcode == TYPE_CODE_REF || refcode == TYPE_CODE_RVALUE_REF);
16951 target_type = die_type (die, cu);
16953 /* The die_type call above may have already set the type for this DIE. */
16954 type = get_die_type (die, cu);
16958 type = lookup_reference_type (target_type, refcode);
16959 attr = dwarf2_attr (die, DW_AT_byte_size, cu);
16962 TYPE_LENGTH (type) = DW_UNSND (attr);
16966 TYPE_LENGTH (type) = cu_header->addr_size;
16968 maybe_set_alignment (cu, die, type);
16969 return set_die_type (die, type, cu);
16972 /* Add the given cv-qualifiers to the element type of the array. GCC
16973 outputs DWARF type qualifiers that apply to an array, not the
16974 element type. But GDB relies on the array element type to carry
16975 the cv-qualifiers. This mimics section 6.7.3 of the C99
16978 static struct type *
16979 add_array_cv_type (struct die_info *die, struct dwarf2_cu *cu,
16980 struct type *base_type, int cnst, int voltl)
16982 struct type *el_type, *inner_array;
16984 base_type = copy_type (base_type);
16985 inner_array = base_type;
16987 while (TYPE_CODE (TYPE_TARGET_TYPE (inner_array)) == TYPE_CODE_ARRAY)
16989 TYPE_TARGET_TYPE (inner_array) =
16990 copy_type (TYPE_TARGET_TYPE (inner_array));
16991 inner_array = TYPE_TARGET_TYPE (inner_array);
16994 el_type = TYPE_TARGET_TYPE (inner_array);
16995 cnst |= TYPE_CONST (el_type);
16996 voltl |= TYPE_VOLATILE (el_type);
16997 TYPE_TARGET_TYPE (inner_array) = make_cv_type (cnst, voltl, el_type, NULL);
16999 return set_die_type (die, base_type, cu);
17002 static struct type *
17003 read_tag_const_type (struct die_info *die, struct dwarf2_cu *cu)
17005 struct type *base_type, *cv_type;
17007 base_type = die_type (die, cu);
17009 /* The die_type call above may have already set the type for this DIE. */
17010 cv_type = get_die_type (die, cu);
17014 /* In case the const qualifier is applied to an array type, the element type
17015 is so qualified, not the array type (section 6.7.3 of C99). */
17016 if (TYPE_CODE (base_type) == TYPE_CODE_ARRAY)
17017 return add_array_cv_type (die, cu, base_type, 1, 0);
17019 cv_type = make_cv_type (1, TYPE_VOLATILE (base_type), base_type, 0);
17020 return set_die_type (die, cv_type, cu);
17023 static struct type *
17024 read_tag_volatile_type (struct die_info *die, struct dwarf2_cu *cu)
17026 struct type *base_type, *cv_type;
17028 base_type = die_type (die, cu);
17030 /* The die_type call above may have already set the type for this DIE. */
17031 cv_type = get_die_type (die, cu);
17035 /* In case the volatile qualifier is applied to an array type, the
17036 element type is so qualified, not the array type (section 6.7.3
17038 if (TYPE_CODE (base_type) == TYPE_CODE_ARRAY)
17039 return add_array_cv_type (die, cu, base_type, 0, 1);
17041 cv_type = make_cv_type (TYPE_CONST (base_type), 1, base_type, 0);
17042 return set_die_type (die, cv_type, cu);
17045 /* Handle DW_TAG_restrict_type. */
17047 static struct type *
17048 read_tag_restrict_type (struct die_info *die, struct dwarf2_cu *cu)
17050 struct type *base_type, *cv_type;
17052 base_type = die_type (die, cu);
17054 /* The die_type call above may have already set the type for this DIE. */
17055 cv_type = get_die_type (die, cu);
17059 cv_type = make_restrict_type (base_type);
17060 return set_die_type (die, cv_type, cu);
17063 /* Handle DW_TAG_atomic_type. */
17065 static struct type *
17066 read_tag_atomic_type (struct die_info *die, struct dwarf2_cu *cu)
17068 struct type *base_type, *cv_type;
17070 base_type = die_type (die, cu);
17072 /* The die_type call above may have already set the type for this DIE. */
17073 cv_type = get_die_type (die, cu);
17077 cv_type = make_atomic_type (base_type);
17078 return set_die_type (die, cv_type, cu);
17081 /* Extract all information from a DW_TAG_string_type DIE and add to
17082 the user defined type vector. It isn't really a user defined type,
17083 but it behaves like one, with other DIE's using an AT_user_def_type
17084 attribute to reference it. */
17086 static struct type *
17087 read_tag_string_type (struct die_info *die, struct dwarf2_cu *cu)
17089 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
17090 struct gdbarch *gdbarch = get_objfile_arch (objfile);
17091 struct type *type, *range_type, *index_type, *char_type;
17092 struct attribute *attr;
17093 unsigned int length;
17095 attr = dwarf2_attr (die, DW_AT_string_length, cu);
17098 length = DW_UNSND (attr);
17102 /* Check for the DW_AT_byte_size attribute. */
17103 attr = dwarf2_attr (die, DW_AT_byte_size, cu);
17106 length = DW_UNSND (attr);
17114 index_type = objfile_type (objfile)->builtin_int;
17115 range_type = create_static_range_type (NULL, index_type, 1, length);
17116 char_type = language_string_char_type (cu->language_defn, gdbarch);
17117 type = create_string_type (NULL, char_type, range_type);
17119 return set_die_type (die, type, cu);
17122 /* Assuming that DIE corresponds to a function, returns nonzero
17123 if the function is prototyped. */
17126 prototyped_function_p (struct die_info *die, struct dwarf2_cu *cu)
17128 struct attribute *attr;
17130 attr = dwarf2_attr (die, DW_AT_prototyped, cu);
17131 if (attr && (DW_UNSND (attr) != 0))
17134 /* The DWARF standard implies that the DW_AT_prototyped attribute
17135 is only meaninful for C, but the concept also extends to other
17136 languages that allow unprototyped functions (Eg: Objective C).
17137 For all other languages, assume that functions are always
17139 if (cu->language != language_c
17140 && cu->language != language_objc
17141 && cu->language != language_opencl)
17144 /* RealView does not emit DW_AT_prototyped. We can not distinguish
17145 prototyped and unprototyped functions; default to prototyped,
17146 since that is more common in modern code (and RealView warns
17147 about unprototyped functions). */
17148 if (producer_is_realview (cu->producer))
17154 /* Handle DIES due to C code like:
17158 int (*funcp)(int a, long l);
17162 ('funcp' generates a DW_TAG_subroutine_type DIE). */
17164 static struct type *
17165 read_subroutine_type (struct die_info *die, struct dwarf2_cu *cu)
17167 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
17168 struct type *type; /* Type that this function returns. */
17169 struct type *ftype; /* Function that returns above type. */
17170 struct attribute *attr;
17172 type = die_type (die, cu);
17174 /* The die_type call above may have already set the type for this DIE. */
17175 ftype = get_die_type (die, cu);
17179 ftype = lookup_function_type (type);
17181 if (prototyped_function_p (die, cu))
17182 TYPE_PROTOTYPED (ftype) = 1;
17184 /* Store the calling convention in the type if it's available in
17185 the subroutine die. Otherwise set the calling convention to
17186 the default value DW_CC_normal. */
17187 attr = dwarf2_attr (die, DW_AT_calling_convention, cu);
17189 TYPE_CALLING_CONVENTION (ftype) = DW_UNSND (attr);
17190 else if (cu->producer && strstr (cu->producer, "IBM XL C for OpenCL"))
17191 TYPE_CALLING_CONVENTION (ftype) = DW_CC_GDB_IBM_OpenCL;
17193 TYPE_CALLING_CONVENTION (ftype) = DW_CC_normal;
17195 /* Record whether the function returns normally to its caller or not
17196 if the DWARF producer set that information. */
17197 attr = dwarf2_attr (die, DW_AT_noreturn, cu);
17198 if (attr && (DW_UNSND (attr) != 0))
17199 TYPE_NO_RETURN (ftype) = 1;
17201 /* We need to add the subroutine type to the die immediately so
17202 we don't infinitely recurse when dealing with parameters
17203 declared as the same subroutine type. */
17204 set_die_type (die, ftype, cu);
17206 if (die->child != NULL)
17208 struct type *void_type = objfile_type (objfile)->builtin_void;
17209 struct die_info *child_die;
17210 int nparams, iparams;
17212 /* Count the number of parameters.
17213 FIXME: GDB currently ignores vararg functions, but knows about
17214 vararg member functions. */
17216 child_die = die->child;
17217 while (child_die && child_die->tag)
17219 if (child_die->tag == DW_TAG_formal_parameter)
17221 else if (child_die->tag == DW_TAG_unspecified_parameters)
17222 TYPE_VARARGS (ftype) = 1;
17223 child_die = sibling_die (child_die);
17226 /* Allocate storage for parameters and fill them in. */
17227 TYPE_NFIELDS (ftype) = nparams;
17228 TYPE_FIELDS (ftype) = (struct field *)
17229 TYPE_ZALLOC (ftype, nparams * sizeof (struct field));
17231 /* TYPE_FIELD_TYPE must never be NULL. Pre-fill the array to ensure it
17232 even if we error out during the parameters reading below. */
17233 for (iparams = 0; iparams < nparams; iparams++)
17234 TYPE_FIELD_TYPE (ftype, iparams) = void_type;
17237 child_die = die->child;
17238 while (child_die && child_die->tag)
17240 if (child_die->tag == DW_TAG_formal_parameter)
17242 struct type *arg_type;
17244 /* DWARF version 2 has no clean way to discern C++
17245 static and non-static member functions. G++ helps
17246 GDB by marking the first parameter for non-static
17247 member functions (which is the this pointer) as
17248 artificial. We pass this information to
17249 dwarf2_add_member_fn via TYPE_FIELD_ARTIFICIAL.
17251 DWARF version 3 added DW_AT_object_pointer, which GCC
17252 4.5 does not yet generate. */
17253 attr = dwarf2_attr (child_die, DW_AT_artificial, cu);
17255 TYPE_FIELD_ARTIFICIAL (ftype, iparams) = DW_UNSND (attr);
17257 TYPE_FIELD_ARTIFICIAL (ftype, iparams) = 0;
17258 arg_type = die_type (child_die, cu);
17260 /* RealView does not mark THIS as const, which the testsuite
17261 expects. GCC marks THIS as const in method definitions,
17262 but not in the class specifications (GCC PR 43053). */
17263 if (cu->language == language_cplus && !TYPE_CONST (arg_type)
17264 && TYPE_FIELD_ARTIFICIAL (ftype, iparams))
17267 struct dwarf2_cu *arg_cu = cu;
17268 const char *name = dwarf2_name (child_die, cu);
17270 attr = dwarf2_attr (die, DW_AT_object_pointer, cu);
17273 /* If the compiler emits this, use it. */
17274 if (follow_die_ref (die, attr, &arg_cu) == child_die)
17277 else if (name && strcmp (name, "this") == 0)
17278 /* Function definitions will have the argument names. */
17280 else if (name == NULL && iparams == 0)
17281 /* Declarations may not have the names, so like
17282 elsewhere in GDB, assume an artificial first
17283 argument is "this". */
17287 arg_type = make_cv_type (1, TYPE_VOLATILE (arg_type),
17291 TYPE_FIELD_TYPE (ftype, iparams) = arg_type;
17294 child_die = sibling_die (child_die);
17301 static struct type *
17302 read_typedef (struct die_info *die, struct dwarf2_cu *cu)
17304 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
17305 const char *name = NULL;
17306 struct type *this_type, *target_type;
17308 name = dwarf2_full_name (NULL, die, cu);
17309 this_type = init_type (objfile, TYPE_CODE_TYPEDEF, 0, name);
17310 TYPE_TARGET_STUB (this_type) = 1;
17311 set_die_type (die, this_type, cu);
17312 target_type = die_type (die, cu);
17313 if (target_type != this_type)
17314 TYPE_TARGET_TYPE (this_type) = target_type;
17317 /* Self-referential typedefs are, it seems, not allowed by the DWARF
17318 spec and cause infinite loops in GDB. */
17319 complaint (_("Self-referential DW_TAG_typedef "
17320 "- DIE at %s [in module %s]"),
17321 sect_offset_str (die->sect_off), objfile_name (objfile));
17322 TYPE_TARGET_TYPE (this_type) = NULL;
17327 /* Allocate a floating-point type of size BITS and name NAME. Pass NAME_HINT
17328 (which may be different from NAME) to the architecture back-end to allow
17329 it to guess the correct format if necessary. */
17331 static struct type *
17332 dwarf2_init_float_type (struct objfile *objfile, int bits, const char *name,
17333 const char *name_hint)
17335 struct gdbarch *gdbarch = get_objfile_arch (objfile);
17336 const struct floatformat **format;
17339 format = gdbarch_floatformat_for_type (gdbarch, name_hint, bits);
17341 type = init_float_type (objfile, bits, name, format);
17343 type = init_type (objfile, TYPE_CODE_ERROR, bits, name);
17348 /* Find a representation of a given base type and install
17349 it in the TYPE field of the die. */
17351 static struct type *
17352 read_base_type (struct die_info *die, struct dwarf2_cu *cu)
17354 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
17356 struct attribute *attr;
17357 int encoding = 0, bits = 0;
17360 attr = dwarf2_attr (die, DW_AT_encoding, cu);
17363 encoding = DW_UNSND (attr);
17365 attr = dwarf2_attr (die, DW_AT_byte_size, cu);
17368 bits = DW_UNSND (attr) * TARGET_CHAR_BIT;
17370 name = dwarf2_name (die, cu);
17373 complaint (_("DW_AT_name missing from DW_TAG_base_type"));
17378 case DW_ATE_address:
17379 /* Turn DW_ATE_address into a void * pointer. */
17380 type = init_type (objfile, TYPE_CODE_VOID, TARGET_CHAR_BIT, NULL);
17381 type = init_pointer_type (objfile, bits, name, type);
17383 case DW_ATE_boolean:
17384 type = init_boolean_type (objfile, bits, 1, name);
17386 case DW_ATE_complex_float:
17387 type = dwarf2_init_float_type (objfile, bits / 2, NULL, name);
17388 type = init_complex_type (objfile, name, type);
17390 case DW_ATE_decimal_float:
17391 type = init_decfloat_type (objfile, bits, name);
17394 type = dwarf2_init_float_type (objfile, bits, name, name);
17396 case DW_ATE_signed:
17397 type = init_integer_type (objfile, bits, 0, name);
17399 case DW_ATE_unsigned:
17400 if (cu->language == language_fortran
17402 && startswith (name, "character("))
17403 type = init_character_type (objfile, bits, 1, name);
17405 type = init_integer_type (objfile, bits, 1, name);
17407 case DW_ATE_signed_char:
17408 if (cu->language == language_ada || cu->language == language_m2
17409 || cu->language == language_pascal
17410 || cu->language == language_fortran)
17411 type = init_character_type (objfile, bits, 0, name);
17413 type = init_integer_type (objfile, bits, 0, name);
17415 case DW_ATE_unsigned_char:
17416 if (cu->language == language_ada || cu->language == language_m2
17417 || cu->language == language_pascal
17418 || cu->language == language_fortran
17419 || cu->language == language_rust)
17420 type = init_character_type (objfile, bits, 1, name);
17422 type = init_integer_type (objfile, bits, 1, name);
17426 gdbarch *arch = get_objfile_arch (objfile);
17429 type = builtin_type (arch)->builtin_char16;
17430 else if (bits == 32)
17431 type = builtin_type (arch)->builtin_char32;
17434 complaint (_("unsupported DW_ATE_UTF bit size: '%d'"),
17436 type = init_integer_type (objfile, bits, 1, name);
17438 return set_die_type (die, type, cu);
17443 complaint (_("unsupported DW_AT_encoding: '%s'"),
17444 dwarf_type_encoding_name (encoding));
17445 type = init_type (objfile, TYPE_CODE_ERROR, bits, name);
17449 if (name && strcmp (name, "char") == 0)
17450 TYPE_NOSIGN (type) = 1;
17452 maybe_set_alignment (cu, die, type);
17454 return set_die_type (die, type, cu);
17457 /* Parse dwarf attribute if it's a block, reference or constant and put the
17458 resulting value of the attribute into struct bound_prop.
17459 Returns 1 if ATTR could be resolved into PROP, 0 otherwise. */
17462 attr_to_dynamic_prop (const struct attribute *attr, struct die_info *die,
17463 struct dwarf2_cu *cu, struct dynamic_prop *prop)
17465 struct dwarf2_property_baton *baton;
17466 struct obstack *obstack
17467 = &cu->per_cu->dwarf2_per_objfile->objfile->objfile_obstack;
17469 if (attr == NULL || prop == NULL)
17472 if (attr_form_is_block (attr))
17474 baton = XOBNEW (obstack, struct dwarf2_property_baton);
17475 baton->referenced_type = NULL;
17476 baton->locexpr.per_cu = cu->per_cu;
17477 baton->locexpr.size = DW_BLOCK (attr)->size;
17478 baton->locexpr.data = DW_BLOCK (attr)->data;
17479 prop->data.baton = baton;
17480 prop->kind = PROP_LOCEXPR;
17481 gdb_assert (prop->data.baton != NULL);
17483 else if (attr_form_is_ref (attr))
17485 struct dwarf2_cu *target_cu = cu;
17486 struct die_info *target_die;
17487 struct attribute *target_attr;
17489 target_die = follow_die_ref (die, attr, &target_cu);
17490 target_attr = dwarf2_attr (target_die, DW_AT_location, target_cu);
17491 if (target_attr == NULL)
17492 target_attr = dwarf2_attr (target_die, DW_AT_data_member_location,
17494 if (target_attr == NULL)
17497 switch (target_attr->name)
17499 case DW_AT_location:
17500 if (attr_form_is_section_offset (target_attr))
17502 baton = XOBNEW (obstack, struct dwarf2_property_baton);
17503 baton->referenced_type = die_type (target_die, target_cu);
17504 fill_in_loclist_baton (cu, &baton->loclist, target_attr);
17505 prop->data.baton = baton;
17506 prop->kind = PROP_LOCLIST;
17507 gdb_assert (prop->data.baton != NULL);
17509 else if (attr_form_is_block (target_attr))
17511 baton = XOBNEW (obstack, struct dwarf2_property_baton);
17512 baton->referenced_type = die_type (target_die, target_cu);
17513 baton->locexpr.per_cu = cu->per_cu;
17514 baton->locexpr.size = DW_BLOCK (target_attr)->size;
17515 baton->locexpr.data = DW_BLOCK (target_attr)->data;
17516 prop->data.baton = baton;
17517 prop->kind = PROP_LOCEXPR;
17518 gdb_assert (prop->data.baton != NULL);
17522 dwarf2_invalid_attrib_class_complaint ("DW_AT_location",
17523 "dynamic property");
17527 case DW_AT_data_member_location:
17531 if (!handle_data_member_location (target_die, target_cu,
17535 baton = XOBNEW (obstack, struct dwarf2_property_baton);
17536 baton->referenced_type = read_type_die (target_die->parent,
17538 baton->offset_info.offset = offset;
17539 baton->offset_info.type = die_type (target_die, target_cu);
17540 prop->data.baton = baton;
17541 prop->kind = PROP_ADDR_OFFSET;
17546 else if (attr_form_is_constant (attr))
17548 prop->data.const_val = dwarf2_get_attr_constant_value (attr, 0);
17549 prop->kind = PROP_CONST;
17553 dwarf2_invalid_attrib_class_complaint (dwarf_form_name (attr->form),
17554 dwarf2_name (die, cu));
17561 /* Read the given DW_AT_subrange DIE. */
17563 static struct type *
17564 read_subrange_type (struct die_info *die, struct dwarf2_cu *cu)
17566 struct type *base_type, *orig_base_type;
17567 struct type *range_type;
17568 struct attribute *attr;
17569 struct dynamic_prop low, high;
17570 int low_default_is_valid;
17571 int high_bound_is_count = 0;
17573 LONGEST negative_mask;
17575 orig_base_type = die_type (die, cu);
17576 /* If ORIG_BASE_TYPE is a typedef, it will not be TYPE_UNSIGNED,
17577 whereas the real type might be. So, we use ORIG_BASE_TYPE when
17578 creating the range type, but we use the result of check_typedef
17579 when examining properties of the type. */
17580 base_type = check_typedef (orig_base_type);
17582 /* The die_type call above may have already set the type for this DIE. */
17583 range_type = get_die_type (die, cu);
17587 low.kind = PROP_CONST;
17588 high.kind = PROP_CONST;
17589 high.data.const_val = 0;
17591 /* Set LOW_DEFAULT_IS_VALID if current language and DWARF version allow
17592 omitting DW_AT_lower_bound. */
17593 switch (cu->language)
17596 case language_cplus:
17597 low.data.const_val = 0;
17598 low_default_is_valid = 1;
17600 case language_fortran:
17601 low.data.const_val = 1;
17602 low_default_is_valid = 1;
17605 case language_objc:
17606 case language_rust:
17607 low.data.const_val = 0;
17608 low_default_is_valid = (cu->header.version >= 4);
17612 case language_pascal:
17613 low.data.const_val = 1;
17614 low_default_is_valid = (cu->header.version >= 4);
17617 low.data.const_val = 0;
17618 low_default_is_valid = 0;
17622 attr = dwarf2_attr (die, DW_AT_lower_bound, cu);
17624 attr_to_dynamic_prop (attr, die, cu, &low);
17625 else if (!low_default_is_valid)
17626 complaint (_("Missing DW_AT_lower_bound "
17627 "- DIE at %s [in module %s]"),
17628 sect_offset_str (die->sect_off),
17629 objfile_name (cu->per_cu->dwarf2_per_objfile->objfile));
17631 attr = dwarf2_attr (die, DW_AT_upper_bound, cu);
17632 if (!attr_to_dynamic_prop (attr, die, cu, &high))
17634 attr = dwarf2_attr (die, DW_AT_count, cu);
17635 if (attr_to_dynamic_prop (attr, die, cu, &high))
17637 /* If bounds are constant do the final calculation here. */
17638 if (low.kind == PROP_CONST && high.kind == PROP_CONST)
17639 high.data.const_val = low.data.const_val + high.data.const_val - 1;
17641 high_bound_is_count = 1;
17645 /* Dwarf-2 specifications explicitly allows to create subrange types
17646 without specifying a base type.
17647 In that case, the base type must be set to the type of
17648 the lower bound, upper bound or count, in that order, if any of these
17649 three attributes references an object that has a type.
17650 If no base type is found, the Dwarf-2 specifications say that
17651 a signed integer type of size equal to the size of an address should
17653 For the following C code: `extern char gdb_int [];'
17654 GCC produces an empty range DIE.
17655 FIXME: muller/2010-05-28: Possible references to object for low bound,
17656 high bound or count are not yet handled by this code. */
17657 if (TYPE_CODE (base_type) == TYPE_CODE_VOID)
17659 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
17660 struct gdbarch *gdbarch = get_objfile_arch (objfile);
17661 int addr_size = gdbarch_addr_bit (gdbarch) /8;
17662 struct type *int_type = objfile_type (objfile)->builtin_int;
17664 /* Test "int", "long int", and "long long int" objfile types,
17665 and select the first one having a size above or equal to the
17666 architecture address size. */
17667 if (int_type && TYPE_LENGTH (int_type) >= addr_size)
17668 base_type = int_type;
17671 int_type = objfile_type (objfile)->builtin_long;
17672 if (int_type && TYPE_LENGTH (int_type) >= addr_size)
17673 base_type = int_type;
17676 int_type = objfile_type (objfile)->builtin_long_long;
17677 if (int_type && TYPE_LENGTH (int_type) >= addr_size)
17678 base_type = int_type;
17683 /* Normally, the DWARF producers are expected to use a signed
17684 constant form (Eg. DW_FORM_sdata) to express negative bounds.
17685 But this is unfortunately not always the case, as witnessed
17686 with GCC, for instance, where the ambiguous DW_FORM_dataN form
17687 is used instead. To work around that ambiguity, we treat
17688 the bounds as signed, and thus sign-extend their values, when
17689 the base type is signed. */
17691 -((LONGEST) 1 << (TYPE_LENGTH (base_type) * TARGET_CHAR_BIT - 1));
17692 if (low.kind == PROP_CONST
17693 && !TYPE_UNSIGNED (base_type) && (low.data.const_val & negative_mask))
17694 low.data.const_val |= negative_mask;
17695 if (high.kind == PROP_CONST
17696 && !TYPE_UNSIGNED (base_type) && (high.data.const_val & negative_mask))
17697 high.data.const_val |= negative_mask;
17699 range_type = create_range_type (NULL, orig_base_type, &low, &high);
17701 if (high_bound_is_count)
17702 TYPE_RANGE_DATA (range_type)->flag_upper_bound_is_count = 1;
17704 /* Ada expects an empty array on no boundary attributes. */
17705 if (attr == NULL && cu->language != language_ada)
17706 TYPE_HIGH_BOUND_KIND (range_type) = PROP_UNDEFINED;
17708 name = dwarf2_name (die, cu);
17710 TYPE_NAME (range_type) = name;
17712 attr = dwarf2_attr (die, DW_AT_byte_size, cu);
17714 TYPE_LENGTH (range_type) = DW_UNSND (attr);
17716 maybe_set_alignment (cu, die, range_type);
17718 set_die_type (die, range_type, cu);
17720 /* set_die_type should be already done. */
17721 set_descriptive_type (range_type, die, cu);
17726 static struct type *
17727 read_unspecified_type (struct die_info *die, struct dwarf2_cu *cu)
17731 type = init_type (cu->per_cu->dwarf2_per_objfile->objfile, TYPE_CODE_VOID,0,
17733 TYPE_NAME (type) = dwarf2_name (die, cu);
17735 /* In Ada, an unspecified type is typically used when the description
17736 of the type is defered to a different unit. When encountering
17737 such a type, we treat it as a stub, and try to resolve it later on,
17739 if (cu->language == language_ada)
17740 TYPE_STUB (type) = 1;
17742 return set_die_type (die, type, cu);
17745 /* Read a single die and all its descendents. Set the die's sibling
17746 field to NULL; set other fields in the die correctly, and set all
17747 of the descendents' fields correctly. Set *NEW_INFO_PTR to the
17748 location of the info_ptr after reading all of those dies. PARENT
17749 is the parent of the die in question. */
17751 static struct die_info *
17752 read_die_and_children (const struct die_reader_specs *reader,
17753 const gdb_byte *info_ptr,
17754 const gdb_byte **new_info_ptr,
17755 struct die_info *parent)
17757 struct die_info *die;
17758 const gdb_byte *cur_ptr;
17761 cur_ptr = read_full_die_1 (reader, &die, info_ptr, &has_children, 0);
17764 *new_info_ptr = cur_ptr;
17767 store_in_ref_table (die, reader->cu);
17770 die->child = read_die_and_siblings_1 (reader, cur_ptr, new_info_ptr, die);
17774 *new_info_ptr = cur_ptr;
17777 die->sibling = NULL;
17778 die->parent = parent;
17782 /* Read a die, all of its descendents, and all of its siblings; set
17783 all of the fields of all of the dies correctly. Arguments are as
17784 in read_die_and_children. */
17786 static struct die_info *
17787 read_die_and_siblings_1 (const struct die_reader_specs *reader,
17788 const gdb_byte *info_ptr,
17789 const gdb_byte **new_info_ptr,
17790 struct die_info *parent)
17792 struct die_info *first_die, *last_sibling;
17793 const gdb_byte *cur_ptr;
17795 cur_ptr = info_ptr;
17796 first_die = last_sibling = NULL;
17800 struct die_info *die
17801 = read_die_and_children (reader, cur_ptr, &cur_ptr, parent);
17805 *new_info_ptr = cur_ptr;
17812 last_sibling->sibling = die;
17814 last_sibling = die;
17818 /* Read a die, all of its descendents, and all of its siblings; set
17819 all of the fields of all of the dies correctly. Arguments are as
17820 in read_die_and_children.
17821 This the main entry point for reading a DIE and all its children. */
17823 static struct die_info *
17824 read_die_and_siblings (const struct die_reader_specs *reader,
17825 const gdb_byte *info_ptr,
17826 const gdb_byte **new_info_ptr,
17827 struct die_info *parent)
17829 struct die_info *die = read_die_and_siblings_1 (reader, info_ptr,
17830 new_info_ptr, parent);
17832 if (dwarf_die_debug)
17834 fprintf_unfiltered (gdb_stdlog,
17835 "Read die from %s@0x%x of %s:\n",
17836 get_section_name (reader->die_section),
17837 (unsigned) (info_ptr - reader->die_section->buffer),
17838 bfd_get_filename (reader->abfd));
17839 dump_die (die, dwarf_die_debug);
17845 /* Read a die and all its attributes, leave space for NUM_EXTRA_ATTRS
17847 The caller is responsible for filling in the extra attributes
17848 and updating (*DIEP)->num_attrs.
17849 Set DIEP to point to a newly allocated die with its information,
17850 except for its child, sibling, and parent fields.
17851 Set HAS_CHILDREN to tell whether the die has children or not. */
17853 static const gdb_byte *
17854 read_full_die_1 (const struct die_reader_specs *reader,
17855 struct die_info **diep, const gdb_byte *info_ptr,
17856 int *has_children, int num_extra_attrs)
17858 unsigned int abbrev_number, bytes_read, i;
17859 struct abbrev_info *abbrev;
17860 struct die_info *die;
17861 struct dwarf2_cu *cu = reader->cu;
17862 bfd *abfd = reader->abfd;
17864 sect_offset sect_off = (sect_offset) (info_ptr - reader->buffer);
17865 abbrev_number = read_unsigned_leb128 (abfd, info_ptr, &bytes_read);
17866 info_ptr += bytes_read;
17867 if (!abbrev_number)
17874 abbrev = reader->abbrev_table->lookup_abbrev (abbrev_number);
17876 error (_("Dwarf Error: could not find abbrev number %d [in module %s]"),
17878 bfd_get_filename (abfd));
17880 die = dwarf_alloc_die (cu, abbrev->num_attrs + num_extra_attrs);
17881 die->sect_off = sect_off;
17882 die->tag = abbrev->tag;
17883 die->abbrev = abbrev_number;
17885 /* Make the result usable.
17886 The caller needs to update num_attrs after adding the extra
17888 die->num_attrs = abbrev->num_attrs;
17890 for (i = 0; i < abbrev->num_attrs; ++i)
17891 info_ptr = read_attribute (reader, &die->attrs[i], &abbrev->attrs[i],
17895 *has_children = abbrev->has_children;
17899 /* Read a die and all its attributes.
17900 Set DIEP to point to a newly allocated die with its information,
17901 except for its child, sibling, and parent fields.
17902 Set HAS_CHILDREN to tell whether the die has children or not. */
17904 static const gdb_byte *
17905 read_full_die (const struct die_reader_specs *reader,
17906 struct die_info **diep, const gdb_byte *info_ptr,
17909 const gdb_byte *result;
17911 result = read_full_die_1 (reader, diep, info_ptr, has_children, 0);
17913 if (dwarf_die_debug)
17915 fprintf_unfiltered (gdb_stdlog,
17916 "Read die from %s@0x%x of %s:\n",
17917 get_section_name (reader->die_section),
17918 (unsigned) (info_ptr - reader->die_section->buffer),
17919 bfd_get_filename (reader->abfd));
17920 dump_die (*diep, dwarf_die_debug);
17926 /* Abbreviation tables.
17928 In DWARF version 2, the description of the debugging information is
17929 stored in a separate .debug_abbrev section. Before we read any
17930 dies from a section we read in all abbreviations and install them
17931 in a hash table. */
17933 /* Allocate space for a struct abbrev_info object in ABBREV_TABLE. */
17935 struct abbrev_info *
17936 abbrev_table::alloc_abbrev ()
17938 struct abbrev_info *abbrev;
17940 abbrev = XOBNEW (&abbrev_obstack, struct abbrev_info);
17941 memset (abbrev, 0, sizeof (struct abbrev_info));
17946 /* Add an abbreviation to the table. */
17949 abbrev_table::add_abbrev (unsigned int abbrev_number,
17950 struct abbrev_info *abbrev)
17952 unsigned int hash_number;
17954 hash_number = abbrev_number % ABBREV_HASH_SIZE;
17955 abbrev->next = m_abbrevs[hash_number];
17956 m_abbrevs[hash_number] = abbrev;
17959 /* Look up an abbrev in the table.
17960 Returns NULL if the abbrev is not found. */
17962 struct abbrev_info *
17963 abbrev_table::lookup_abbrev (unsigned int abbrev_number)
17965 unsigned int hash_number;
17966 struct abbrev_info *abbrev;
17968 hash_number = abbrev_number % ABBREV_HASH_SIZE;
17969 abbrev = m_abbrevs[hash_number];
17973 if (abbrev->number == abbrev_number)
17975 abbrev = abbrev->next;
17980 /* Read in an abbrev table. */
17982 static abbrev_table_up
17983 abbrev_table_read_table (struct dwarf2_per_objfile *dwarf2_per_objfile,
17984 struct dwarf2_section_info *section,
17985 sect_offset sect_off)
17987 struct objfile *objfile = dwarf2_per_objfile->objfile;
17988 bfd *abfd = get_section_bfd_owner (section);
17989 const gdb_byte *abbrev_ptr;
17990 struct abbrev_info *cur_abbrev;
17991 unsigned int abbrev_number, bytes_read, abbrev_name;
17992 unsigned int abbrev_form;
17993 struct attr_abbrev *cur_attrs;
17994 unsigned int allocated_attrs;
17996 abbrev_table_up abbrev_table (new struct abbrev_table (sect_off));
17998 dwarf2_read_section (objfile, section);
17999 abbrev_ptr = section->buffer + to_underlying (sect_off);
18000 abbrev_number = read_unsigned_leb128 (abfd, abbrev_ptr, &bytes_read);
18001 abbrev_ptr += bytes_read;
18003 allocated_attrs = ATTR_ALLOC_CHUNK;
18004 cur_attrs = XNEWVEC (struct attr_abbrev, allocated_attrs);
18006 /* Loop until we reach an abbrev number of 0. */
18007 while (abbrev_number)
18009 cur_abbrev = abbrev_table->alloc_abbrev ();
18011 /* read in abbrev header */
18012 cur_abbrev->number = abbrev_number;
18014 = (enum dwarf_tag) read_unsigned_leb128 (abfd, abbrev_ptr, &bytes_read);
18015 abbrev_ptr += bytes_read;
18016 cur_abbrev->has_children = read_1_byte (abfd, abbrev_ptr);
18019 /* now read in declarations */
18022 LONGEST implicit_const;
18024 abbrev_name = read_unsigned_leb128 (abfd, abbrev_ptr, &bytes_read);
18025 abbrev_ptr += bytes_read;
18026 abbrev_form = read_unsigned_leb128 (abfd, abbrev_ptr, &bytes_read);
18027 abbrev_ptr += bytes_read;
18028 if (abbrev_form == DW_FORM_implicit_const)
18030 implicit_const = read_signed_leb128 (abfd, abbrev_ptr,
18032 abbrev_ptr += bytes_read;
18036 /* Initialize it due to a false compiler warning. */
18037 implicit_const = -1;
18040 if (abbrev_name == 0)
18043 if (cur_abbrev->num_attrs == allocated_attrs)
18045 allocated_attrs += ATTR_ALLOC_CHUNK;
18047 = XRESIZEVEC (struct attr_abbrev, cur_attrs, allocated_attrs);
18050 cur_attrs[cur_abbrev->num_attrs].name
18051 = (enum dwarf_attribute) abbrev_name;
18052 cur_attrs[cur_abbrev->num_attrs].form
18053 = (enum dwarf_form) abbrev_form;
18054 cur_attrs[cur_abbrev->num_attrs].implicit_const = implicit_const;
18055 ++cur_abbrev->num_attrs;
18058 cur_abbrev->attrs =
18059 XOBNEWVEC (&abbrev_table->abbrev_obstack, struct attr_abbrev,
18060 cur_abbrev->num_attrs);
18061 memcpy (cur_abbrev->attrs, cur_attrs,
18062 cur_abbrev->num_attrs * sizeof (struct attr_abbrev));
18064 abbrev_table->add_abbrev (abbrev_number, cur_abbrev);
18066 /* Get next abbreviation.
18067 Under Irix6 the abbreviations for a compilation unit are not
18068 always properly terminated with an abbrev number of 0.
18069 Exit loop if we encounter an abbreviation which we have
18070 already read (which means we are about to read the abbreviations
18071 for the next compile unit) or if the end of the abbreviation
18072 table is reached. */
18073 if ((unsigned int) (abbrev_ptr - section->buffer) >= section->size)
18075 abbrev_number = read_unsigned_leb128 (abfd, abbrev_ptr, &bytes_read);
18076 abbrev_ptr += bytes_read;
18077 if (abbrev_table->lookup_abbrev (abbrev_number) != NULL)
18082 return abbrev_table;
18085 /* Returns nonzero if TAG represents a type that we might generate a partial
18089 is_type_tag_for_partial (int tag)
18094 /* Some types that would be reasonable to generate partial symbols for,
18095 that we don't at present. */
18096 case DW_TAG_array_type:
18097 case DW_TAG_file_type:
18098 case DW_TAG_ptr_to_member_type:
18099 case DW_TAG_set_type:
18100 case DW_TAG_string_type:
18101 case DW_TAG_subroutine_type:
18103 case DW_TAG_base_type:
18104 case DW_TAG_class_type:
18105 case DW_TAG_interface_type:
18106 case DW_TAG_enumeration_type:
18107 case DW_TAG_structure_type:
18108 case DW_TAG_subrange_type:
18109 case DW_TAG_typedef:
18110 case DW_TAG_union_type:
18117 /* Load all DIEs that are interesting for partial symbols into memory. */
18119 static struct partial_die_info *
18120 load_partial_dies (const struct die_reader_specs *reader,
18121 const gdb_byte *info_ptr, int building_psymtab)
18123 struct dwarf2_cu *cu = reader->cu;
18124 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
18125 struct partial_die_info *parent_die, *last_die, *first_die = NULL;
18126 unsigned int bytes_read;
18127 unsigned int load_all = 0;
18128 int nesting_level = 1;
18133 gdb_assert (cu->per_cu != NULL);
18134 if (cu->per_cu->load_all_dies)
18138 = htab_create_alloc_ex (cu->header.length / 12,
18142 &cu->comp_unit_obstack,
18143 hashtab_obstack_allocate,
18144 dummy_obstack_deallocate);
18148 abbrev_info *abbrev = peek_die_abbrev (*reader, info_ptr, &bytes_read);
18150 /* A NULL abbrev means the end of a series of children. */
18151 if (abbrev == NULL)
18153 if (--nesting_level == 0)
18156 info_ptr += bytes_read;
18157 last_die = parent_die;
18158 parent_die = parent_die->die_parent;
18162 /* Check for template arguments. We never save these; if
18163 they're seen, we just mark the parent, and go on our way. */
18164 if (parent_die != NULL
18165 && cu->language == language_cplus
18166 && (abbrev->tag == DW_TAG_template_type_param
18167 || abbrev->tag == DW_TAG_template_value_param))
18169 parent_die->has_template_arguments = 1;
18173 /* We don't need a partial DIE for the template argument. */
18174 info_ptr = skip_one_die (reader, info_ptr + bytes_read, abbrev);
18179 /* We only recurse into c++ subprograms looking for template arguments.
18180 Skip their other children. */
18182 && cu->language == language_cplus
18183 && parent_die != NULL
18184 && parent_die->tag == DW_TAG_subprogram)
18186 info_ptr = skip_one_die (reader, info_ptr + bytes_read, abbrev);
18190 /* Check whether this DIE is interesting enough to save. Normally
18191 we would not be interested in members here, but there may be
18192 later variables referencing them via DW_AT_specification (for
18193 static members). */
18195 && !is_type_tag_for_partial (abbrev->tag)
18196 && abbrev->tag != DW_TAG_constant
18197 && abbrev->tag != DW_TAG_enumerator
18198 && abbrev->tag != DW_TAG_subprogram
18199 && abbrev->tag != DW_TAG_inlined_subroutine
18200 && abbrev->tag != DW_TAG_lexical_block
18201 && abbrev->tag != DW_TAG_variable
18202 && abbrev->tag != DW_TAG_namespace
18203 && abbrev->tag != DW_TAG_module
18204 && abbrev->tag != DW_TAG_member
18205 && abbrev->tag != DW_TAG_imported_unit
18206 && abbrev->tag != DW_TAG_imported_declaration)
18208 /* Otherwise we skip to the next sibling, if any. */
18209 info_ptr = skip_one_die (reader, info_ptr + bytes_read, abbrev);
18213 struct partial_die_info pdi ((sect_offset) (info_ptr - reader->buffer),
18216 info_ptr = pdi.read (reader, *abbrev, info_ptr + bytes_read);
18218 /* This two-pass algorithm for processing partial symbols has a
18219 high cost in cache pressure. Thus, handle some simple cases
18220 here which cover the majority of C partial symbols. DIEs
18221 which neither have specification tags in them, nor could have
18222 specification tags elsewhere pointing at them, can simply be
18223 processed and discarded.
18225 This segment is also optional; scan_partial_symbols and
18226 add_partial_symbol will handle these DIEs if we chain
18227 them in normally. When compilers which do not emit large
18228 quantities of duplicate debug information are more common,
18229 this code can probably be removed. */
18231 /* Any complete simple types at the top level (pretty much all
18232 of them, for a language without namespaces), can be processed
18234 if (parent_die == NULL
18235 && pdi.has_specification == 0
18236 && pdi.is_declaration == 0
18237 && ((pdi.tag == DW_TAG_typedef && !pdi.has_children)
18238 || pdi.tag == DW_TAG_base_type
18239 || pdi.tag == DW_TAG_subrange_type))
18241 if (building_psymtab && pdi.name != NULL)
18242 add_psymbol_to_list (pdi.name, strlen (pdi.name), 0,
18243 VAR_DOMAIN, LOC_TYPEDEF,
18244 &objfile->static_psymbols,
18245 0, cu->language, objfile);
18246 info_ptr = locate_pdi_sibling (reader, &pdi, info_ptr);
18250 /* The exception for DW_TAG_typedef with has_children above is
18251 a workaround of GCC PR debug/47510. In the case of this complaint
18252 type_name_or_error will error on such types later.
18254 GDB skipped children of DW_TAG_typedef by the shortcut above and then
18255 it could not find the child DIEs referenced later, this is checked
18256 above. In correct DWARF DW_TAG_typedef should have no children. */
18258 if (pdi.tag == DW_TAG_typedef && pdi.has_children)
18259 complaint (_("DW_TAG_typedef has childen - GCC PR debug/47510 bug "
18260 "- DIE at %s [in module %s]"),
18261 sect_offset_str (pdi.sect_off), objfile_name (objfile));
18263 /* If we're at the second level, and we're an enumerator, and
18264 our parent has no specification (meaning possibly lives in a
18265 namespace elsewhere), then we can add the partial symbol now
18266 instead of queueing it. */
18267 if (pdi.tag == DW_TAG_enumerator
18268 && parent_die != NULL
18269 && parent_die->die_parent == NULL
18270 && parent_die->tag == DW_TAG_enumeration_type
18271 && parent_die->has_specification == 0)
18273 if (pdi.name == NULL)
18274 complaint (_("malformed enumerator DIE ignored"));
18275 else if (building_psymtab)
18276 add_psymbol_to_list (pdi.name, strlen (pdi.name), 0,
18277 VAR_DOMAIN, LOC_CONST,
18278 cu->language == language_cplus
18279 ? &objfile->global_psymbols
18280 : &objfile->static_psymbols,
18281 0, cu->language, objfile);
18283 info_ptr = locate_pdi_sibling (reader, &pdi, info_ptr);
18287 struct partial_die_info *part_die
18288 = new (&cu->comp_unit_obstack) partial_die_info (pdi);
18290 /* We'll save this DIE so link it in. */
18291 part_die->die_parent = parent_die;
18292 part_die->die_sibling = NULL;
18293 part_die->die_child = NULL;
18295 if (last_die && last_die == parent_die)
18296 last_die->die_child = part_die;
18298 last_die->die_sibling = part_die;
18300 last_die = part_die;
18302 if (first_die == NULL)
18303 first_die = part_die;
18305 /* Maybe add the DIE to the hash table. Not all DIEs that we
18306 find interesting need to be in the hash table, because we
18307 also have the parent/sibling/child chains; only those that we
18308 might refer to by offset later during partial symbol reading.
18310 For now this means things that might have be the target of a
18311 DW_AT_specification, DW_AT_abstract_origin, or
18312 DW_AT_extension. DW_AT_extension will refer only to
18313 namespaces; DW_AT_abstract_origin refers to functions (and
18314 many things under the function DIE, but we do not recurse
18315 into function DIEs during partial symbol reading) and
18316 possibly variables as well; DW_AT_specification refers to
18317 declarations. Declarations ought to have the DW_AT_declaration
18318 flag. It happens that GCC forgets to put it in sometimes, but
18319 only for functions, not for types.
18321 Adding more things than necessary to the hash table is harmless
18322 except for the performance cost. Adding too few will result in
18323 wasted time in find_partial_die, when we reread the compilation
18324 unit with load_all_dies set. */
18327 || abbrev->tag == DW_TAG_constant
18328 || abbrev->tag == DW_TAG_subprogram
18329 || abbrev->tag == DW_TAG_variable
18330 || abbrev->tag == DW_TAG_namespace
18331 || part_die->is_declaration)
18335 slot = htab_find_slot_with_hash (cu->partial_dies, part_die,
18336 to_underlying (part_die->sect_off),
18341 /* For some DIEs we want to follow their children (if any). For C
18342 we have no reason to follow the children of structures; for other
18343 languages we have to, so that we can get at method physnames
18344 to infer fully qualified class names, for DW_AT_specification,
18345 and for C++ template arguments. For C++, we also look one level
18346 inside functions to find template arguments (if the name of the
18347 function does not already contain the template arguments).
18349 For Ada, we need to scan the children of subprograms and lexical
18350 blocks as well because Ada allows the definition of nested
18351 entities that could be interesting for the debugger, such as
18352 nested subprograms for instance. */
18353 if (last_die->has_children
18355 || last_die->tag == DW_TAG_namespace
18356 || last_die->tag == DW_TAG_module
18357 || last_die->tag == DW_TAG_enumeration_type
18358 || (cu->language == language_cplus
18359 && last_die->tag == DW_TAG_subprogram
18360 && (last_die->name == NULL
18361 || strchr (last_die->name, '<') == NULL))
18362 || (cu->language != language_c
18363 && (last_die->tag == DW_TAG_class_type
18364 || last_die->tag == DW_TAG_interface_type
18365 || last_die->tag == DW_TAG_structure_type
18366 || last_die->tag == DW_TAG_union_type))
18367 || (cu->language == language_ada
18368 && (last_die->tag == DW_TAG_subprogram
18369 || last_die->tag == DW_TAG_lexical_block))))
18372 parent_die = last_die;
18376 /* Otherwise we skip to the next sibling, if any. */
18377 info_ptr = locate_pdi_sibling (reader, last_die, info_ptr);
18379 /* Back to the top, do it again. */
18383 partial_die_info::partial_die_info (sect_offset sect_off_,
18384 struct abbrev_info *abbrev)
18385 : partial_die_info (sect_off_, abbrev->tag, abbrev->has_children)
18389 /* Read a minimal amount of information into the minimal die structure.
18390 INFO_PTR should point just after the initial uleb128 of a DIE. */
18393 partial_die_info::read (const struct die_reader_specs *reader,
18394 const struct abbrev_info &abbrev, const gdb_byte *info_ptr)
18396 struct dwarf2_cu *cu = reader->cu;
18397 struct dwarf2_per_objfile *dwarf2_per_objfile
18398 = cu->per_cu->dwarf2_per_objfile;
18400 int has_low_pc_attr = 0;
18401 int has_high_pc_attr = 0;
18402 int high_pc_relative = 0;
18404 for (i = 0; i < abbrev.num_attrs; ++i)
18406 struct attribute attr;
18408 info_ptr = read_attribute (reader, &attr, &abbrev.attrs[i], info_ptr);
18410 /* Store the data if it is of an attribute we want to keep in a
18411 partial symbol table. */
18417 case DW_TAG_compile_unit:
18418 case DW_TAG_partial_unit:
18419 case DW_TAG_type_unit:
18420 /* Compilation units have a DW_AT_name that is a filename, not
18421 a source language identifier. */
18422 case DW_TAG_enumeration_type:
18423 case DW_TAG_enumerator:
18424 /* These tags always have simple identifiers already; no need
18425 to canonicalize them. */
18426 name = DW_STRING (&attr);
18430 struct objfile *objfile = dwarf2_per_objfile->objfile;
18433 = dwarf2_canonicalize_name (DW_STRING (&attr), cu,
18434 &objfile->per_bfd->storage_obstack);
18439 case DW_AT_linkage_name:
18440 case DW_AT_MIPS_linkage_name:
18441 /* Note that both forms of linkage name might appear. We
18442 assume they will be the same, and we only store the last
18444 if (cu->language == language_ada)
18445 name = DW_STRING (&attr);
18446 linkage_name = DW_STRING (&attr);
18449 has_low_pc_attr = 1;
18450 lowpc = attr_value_as_address (&attr);
18452 case DW_AT_high_pc:
18453 has_high_pc_attr = 1;
18454 highpc = attr_value_as_address (&attr);
18455 if (cu->header.version >= 4 && attr_form_is_constant (&attr))
18456 high_pc_relative = 1;
18458 case DW_AT_location:
18459 /* Support the .debug_loc offsets. */
18460 if (attr_form_is_block (&attr))
18462 d.locdesc = DW_BLOCK (&attr);
18464 else if (attr_form_is_section_offset (&attr))
18466 dwarf2_complex_location_expr_complaint ();
18470 dwarf2_invalid_attrib_class_complaint ("DW_AT_location",
18471 "partial symbol information");
18474 case DW_AT_external:
18475 is_external = DW_UNSND (&attr);
18477 case DW_AT_declaration:
18478 is_declaration = DW_UNSND (&attr);
18483 case DW_AT_abstract_origin:
18484 case DW_AT_specification:
18485 case DW_AT_extension:
18486 has_specification = 1;
18487 spec_offset = dwarf2_get_ref_die_offset (&attr);
18488 spec_is_dwz = (attr.form == DW_FORM_GNU_ref_alt
18489 || cu->per_cu->is_dwz);
18491 case DW_AT_sibling:
18492 /* Ignore absolute siblings, they might point outside of
18493 the current compile unit. */
18494 if (attr.form == DW_FORM_ref_addr)
18495 complaint (_("ignoring absolute DW_AT_sibling"));
18498 const gdb_byte *buffer = reader->buffer;
18499 sect_offset off = dwarf2_get_ref_die_offset (&attr);
18500 const gdb_byte *sibling_ptr = buffer + to_underlying (off);
18502 if (sibling_ptr < info_ptr)
18503 complaint (_("DW_AT_sibling points backwards"));
18504 else if (sibling_ptr > reader->buffer_end)
18505 dwarf2_section_buffer_overflow_complaint (reader->die_section);
18507 sibling = sibling_ptr;
18510 case DW_AT_byte_size:
18513 case DW_AT_const_value:
18514 has_const_value = 1;
18516 case DW_AT_calling_convention:
18517 /* DWARF doesn't provide a way to identify a program's source-level
18518 entry point. DW_AT_calling_convention attributes are only meant
18519 to describe functions' calling conventions.
18521 However, because it's a necessary piece of information in
18522 Fortran, and before DWARF 4 DW_CC_program was the only
18523 piece of debugging information whose definition refers to
18524 a 'main program' at all, several compilers marked Fortran
18525 main programs with DW_CC_program --- even when those
18526 functions use the standard calling conventions.
18528 Although DWARF now specifies a way to provide this
18529 information, we support this practice for backward
18531 if (DW_UNSND (&attr) == DW_CC_program
18532 && cu->language == language_fortran)
18533 main_subprogram = 1;
18536 if (DW_UNSND (&attr) == DW_INL_inlined
18537 || DW_UNSND (&attr) == DW_INL_declared_inlined)
18538 may_be_inlined = 1;
18542 if (tag == DW_TAG_imported_unit)
18544 d.sect_off = dwarf2_get_ref_die_offset (&attr);
18545 is_dwz = (attr.form == DW_FORM_GNU_ref_alt
18546 || cu->per_cu->is_dwz);
18550 case DW_AT_main_subprogram:
18551 main_subprogram = DW_UNSND (&attr);
18559 if (high_pc_relative)
18562 if (has_low_pc_attr && has_high_pc_attr)
18564 /* When using the GNU linker, .gnu.linkonce. sections are used to
18565 eliminate duplicate copies of functions and vtables and such.
18566 The linker will arbitrarily choose one and discard the others.
18567 The AT_*_pc values for such functions refer to local labels in
18568 these sections. If the section from that file was discarded, the
18569 labels are not in the output, so the relocs get a value of 0.
18570 If this is a discarded function, mark the pc bounds as invalid,
18571 so that GDB will ignore it. */
18572 if (lowpc == 0 && !dwarf2_per_objfile->has_section_at_zero)
18574 struct objfile *objfile = dwarf2_per_objfile->objfile;
18575 struct gdbarch *gdbarch = get_objfile_arch (objfile);
18577 complaint (_("DW_AT_low_pc %s is zero "
18578 "for DIE at %s [in module %s]"),
18579 paddress (gdbarch, lowpc),
18580 sect_offset_str (sect_off),
18581 objfile_name (objfile));
18583 /* dwarf2_get_pc_bounds has also the strict low < high requirement. */
18584 else if (lowpc >= highpc)
18586 struct objfile *objfile = dwarf2_per_objfile->objfile;
18587 struct gdbarch *gdbarch = get_objfile_arch (objfile);
18589 complaint (_("DW_AT_low_pc %s is not < DW_AT_high_pc %s "
18590 "for DIE at %s [in module %s]"),
18591 paddress (gdbarch, lowpc),
18592 paddress (gdbarch, highpc),
18593 sect_offset_str (sect_off),
18594 objfile_name (objfile));
18603 /* Find a cached partial DIE at OFFSET in CU. */
18605 struct partial_die_info *
18606 dwarf2_cu::find_partial_die (sect_offset sect_off)
18608 struct partial_die_info *lookup_die = NULL;
18609 struct partial_die_info part_die (sect_off);
18611 lookup_die = ((struct partial_die_info *)
18612 htab_find_with_hash (partial_dies, &part_die,
18613 to_underlying (sect_off)));
18618 /* Find a partial DIE at OFFSET, which may or may not be in CU,
18619 except in the case of .debug_types DIEs which do not reference
18620 outside their CU (they do however referencing other types via
18621 DW_FORM_ref_sig8). */
18623 static struct partial_die_info *
18624 find_partial_die (sect_offset sect_off, int offset_in_dwz, struct dwarf2_cu *cu)
18626 struct dwarf2_per_objfile *dwarf2_per_objfile
18627 = cu->per_cu->dwarf2_per_objfile;
18628 struct objfile *objfile = dwarf2_per_objfile->objfile;
18629 struct dwarf2_per_cu_data *per_cu = NULL;
18630 struct partial_die_info *pd = NULL;
18632 if (offset_in_dwz == cu->per_cu->is_dwz
18633 && offset_in_cu_p (&cu->header, sect_off))
18635 pd = cu->find_partial_die (sect_off);
18638 /* We missed recording what we needed.
18639 Load all dies and try again. */
18640 per_cu = cu->per_cu;
18644 /* TUs don't reference other CUs/TUs (except via type signatures). */
18645 if (cu->per_cu->is_debug_types)
18647 error (_("Dwarf Error: Type Unit at offset %s contains"
18648 " external reference to offset %s [in module %s].\n"),
18649 sect_offset_str (cu->header.sect_off), sect_offset_str (sect_off),
18650 bfd_get_filename (objfile->obfd));
18652 per_cu = dwarf2_find_containing_comp_unit (sect_off, offset_in_dwz,
18653 dwarf2_per_objfile);
18655 if (per_cu->cu == NULL || per_cu->cu->partial_dies == NULL)
18656 load_partial_comp_unit (per_cu);
18658 per_cu->cu->last_used = 0;
18659 pd = per_cu->cu->find_partial_die (sect_off);
18662 /* If we didn't find it, and not all dies have been loaded,
18663 load them all and try again. */
18665 if (pd == NULL && per_cu->load_all_dies == 0)
18667 per_cu->load_all_dies = 1;
18669 /* This is nasty. When we reread the DIEs, somewhere up the call chain
18670 THIS_CU->cu may already be in use. So we can't just free it and
18671 replace its DIEs with the ones we read in. Instead, we leave those
18672 DIEs alone (which can still be in use, e.g. in scan_partial_symbols),
18673 and clobber THIS_CU->cu->partial_dies with the hash table for the new
18675 load_partial_comp_unit (per_cu);
18677 pd = per_cu->cu->find_partial_die (sect_off);
18681 internal_error (__FILE__, __LINE__,
18682 _("could not find partial DIE %s "
18683 "in cache [from module %s]\n"),
18684 sect_offset_str (sect_off), bfd_get_filename (objfile->obfd));
18688 /* See if we can figure out if the class lives in a namespace. We do
18689 this by looking for a member function; its demangled name will
18690 contain namespace info, if there is any. */
18693 guess_partial_die_structure_name (struct partial_die_info *struct_pdi,
18694 struct dwarf2_cu *cu)
18696 /* NOTE: carlton/2003-10-07: Getting the info this way changes
18697 what template types look like, because the demangler
18698 frequently doesn't give the same name as the debug info. We
18699 could fix this by only using the demangled name to get the
18700 prefix (but see comment in read_structure_type). */
18702 struct partial_die_info *real_pdi;
18703 struct partial_die_info *child_pdi;
18705 /* If this DIE (this DIE's specification, if any) has a parent, then
18706 we should not do this. We'll prepend the parent's fully qualified
18707 name when we create the partial symbol. */
18709 real_pdi = struct_pdi;
18710 while (real_pdi->has_specification)
18711 real_pdi = find_partial_die (real_pdi->spec_offset,
18712 real_pdi->spec_is_dwz, cu);
18714 if (real_pdi->die_parent != NULL)
18717 for (child_pdi = struct_pdi->die_child;
18719 child_pdi = child_pdi->die_sibling)
18721 if (child_pdi->tag == DW_TAG_subprogram
18722 && child_pdi->linkage_name != NULL)
18724 char *actual_class_name
18725 = language_class_name_from_physname (cu->language_defn,
18726 child_pdi->linkage_name);
18727 if (actual_class_name != NULL)
18729 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
18732 obstack_copy0 (&objfile->per_bfd->storage_obstack,
18734 strlen (actual_class_name)));
18735 xfree (actual_class_name);
18743 partial_die_info::fixup (struct dwarf2_cu *cu)
18745 /* Once we've fixed up a die, there's no point in doing so again.
18746 This also avoids a memory leak if we were to call
18747 guess_partial_die_structure_name multiple times. */
18751 /* If we found a reference attribute and the DIE has no name, try
18752 to find a name in the referred to DIE. */
18754 if (name == NULL && has_specification)
18756 struct partial_die_info *spec_die;
18758 spec_die = find_partial_die (spec_offset, spec_is_dwz, cu);
18760 spec_die->fixup (cu);
18762 if (spec_die->name)
18764 name = spec_die->name;
18766 /* Copy DW_AT_external attribute if it is set. */
18767 if (spec_die->is_external)
18768 is_external = spec_die->is_external;
18772 /* Set default names for some unnamed DIEs. */
18774 if (name == NULL && tag == DW_TAG_namespace)
18775 name = CP_ANONYMOUS_NAMESPACE_STR;
18777 /* If there is no parent die to provide a namespace, and there are
18778 children, see if we can determine the namespace from their linkage
18780 if (cu->language == language_cplus
18781 && !VEC_empty (dwarf2_section_info_def,
18782 cu->per_cu->dwarf2_per_objfile->types)
18783 && die_parent == NULL
18785 && (tag == DW_TAG_class_type
18786 || tag == DW_TAG_structure_type
18787 || tag == DW_TAG_union_type))
18788 guess_partial_die_structure_name (this, cu);
18790 /* GCC might emit a nameless struct or union that has a linkage
18791 name. See http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47510. */
18793 && (tag == DW_TAG_class_type
18794 || tag == DW_TAG_interface_type
18795 || tag == DW_TAG_structure_type
18796 || tag == DW_TAG_union_type)
18797 && linkage_name != NULL)
18801 demangled = gdb_demangle (linkage_name, DMGL_TYPES);
18806 /* Strip any leading namespaces/classes, keep only the base name.
18807 DW_AT_name for named DIEs does not contain the prefixes. */
18808 base = strrchr (demangled, ':');
18809 if (base && base > demangled && base[-1] == ':')
18814 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
18817 obstack_copy0 (&objfile->per_bfd->storage_obstack,
18818 base, strlen (base)));
18826 /* Read an attribute value described by an attribute form. */
18828 static const gdb_byte *
18829 read_attribute_value (const struct die_reader_specs *reader,
18830 struct attribute *attr, unsigned form,
18831 LONGEST implicit_const, const gdb_byte *info_ptr)
18833 struct dwarf2_cu *cu = reader->cu;
18834 struct dwarf2_per_objfile *dwarf2_per_objfile
18835 = cu->per_cu->dwarf2_per_objfile;
18836 struct objfile *objfile = dwarf2_per_objfile->objfile;
18837 struct gdbarch *gdbarch = get_objfile_arch (objfile);
18838 bfd *abfd = reader->abfd;
18839 struct comp_unit_head *cu_header = &cu->header;
18840 unsigned int bytes_read;
18841 struct dwarf_block *blk;
18843 attr->form = (enum dwarf_form) form;
18846 case DW_FORM_ref_addr:
18847 if (cu->header.version == 2)
18848 DW_UNSND (attr) = read_address (abfd, info_ptr, cu, &bytes_read);
18850 DW_UNSND (attr) = read_offset (abfd, info_ptr,
18851 &cu->header, &bytes_read);
18852 info_ptr += bytes_read;
18854 case DW_FORM_GNU_ref_alt:
18855 DW_UNSND (attr) = read_offset (abfd, info_ptr, &cu->header, &bytes_read);
18856 info_ptr += bytes_read;
18859 DW_ADDR (attr) = read_address (abfd, info_ptr, cu, &bytes_read);
18860 DW_ADDR (attr) = gdbarch_adjust_dwarf2_addr (gdbarch, DW_ADDR (attr));
18861 info_ptr += bytes_read;
18863 case DW_FORM_block2:
18864 blk = dwarf_alloc_block (cu);
18865 blk->size = read_2_bytes (abfd, info_ptr);
18867 blk->data = read_n_bytes (abfd, info_ptr, blk->size);
18868 info_ptr += blk->size;
18869 DW_BLOCK (attr) = blk;
18871 case DW_FORM_block4:
18872 blk = dwarf_alloc_block (cu);
18873 blk->size = read_4_bytes (abfd, info_ptr);
18875 blk->data = read_n_bytes (abfd, info_ptr, blk->size);
18876 info_ptr += blk->size;
18877 DW_BLOCK (attr) = blk;
18879 case DW_FORM_data2:
18880 DW_UNSND (attr) = read_2_bytes (abfd, info_ptr);
18883 case DW_FORM_data4:
18884 DW_UNSND (attr) = read_4_bytes (abfd, info_ptr);
18887 case DW_FORM_data8:
18888 DW_UNSND (attr) = read_8_bytes (abfd, info_ptr);
18891 case DW_FORM_data16:
18892 blk = dwarf_alloc_block (cu);
18894 blk->data = read_n_bytes (abfd, info_ptr, 16);
18896 DW_BLOCK (attr) = blk;
18898 case DW_FORM_sec_offset:
18899 DW_UNSND (attr) = read_offset (abfd, info_ptr, &cu->header, &bytes_read);
18900 info_ptr += bytes_read;
18902 case DW_FORM_string:
18903 DW_STRING (attr) = read_direct_string (abfd, info_ptr, &bytes_read);
18904 DW_STRING_IS_CANONICAL (attr) = 0;
18905 info_ptr += bytes_read;
18908 if (!cu->per_cu->is_dwz)
18910 DW_STRING (attr) = read_indirect_string (dwarf2_per_objfile,
18911 abfd, info_ptr, cu_header,
18913 DW_STRING_IS_CANONICAL (attr) = 0;
18914 info_ptr += bytes_read;
18918 case DW_FORM_line_strp:
18919 if (!cu->per_cu->is_dwz)
18921 DW_STRING (attr) = read_indirect_line_string (dwarf2_per_objfile,
18923 cu_header, &bytes_read);
18924 DW_STRING_IS_CANONICAL (attr) = 0;
18925 info_ptr += bytes_read;
18929 case DW_FORM_GNU_strp_alt:
18931 struct dwz_file *dwz = dwarf2_get_dwz_file (dwarf2_per_objfile);
18932 LONGEST str_offset = read_offset (abfd, info_ptr, cu_header,
18935 DW_STRING (attr) = read_indirect_string_from_dwz (objfile,
18937 DW_STRING_IS_CANONICAL (attr) = 0;
18938 info_ptr += bytes_read;
18941 case DW_FORM_exprloc:
18942 case DW_FORM_block:
18943 blk = dwarf_alloc_block (cu);
18944 blk->size = read_unsigned_leb128 (abfd, info_ptr, &bytes_read);
18945 info_ptr += bytes_read;
18946 blk->data = read_n_bytes (abfd, info_ptr, blk->size);
18947 info_ptr += blk->size;
18948 DW_BLOCK (attr) = blk;
18950 case DW_FORM_block1:
18951 blk = dwarf_alloc_block (cu);
18952 blk->size = read_1_byte (abfd, info_ptr);
18954 blk->data = read_n_bytes (abfd, info_ptr, blk->size);
18955 info_ptr += blk->size;
18956 DW_BLOCK (attr) = blk;
18958 case DW_FORM_data1:
18959 DW_UNSND (attr) = read_1_byte (abfd, info_ptr);
18963 DW_UNSND (attr) = read_1_byte (abfd, info_ptr);
18966 case DW_FORM_flag_present:
18967 DW_UNSND (attr) = 1;
18969 case DW_FORM_sdata:
18970 DW_SND (attr) = read_signed_leb128 (abfd, info_ptr, &bytes_read);
18971 info_ptr += bytes_read;
18973 case DW_FORM_udata:
18974 DW_UNSND (attr) = read_unsigned_leb128 (abfd, info_ptr, &bytes_read);
18975 info_ptr += bytes_read;
18978 DW_UNSND (attr) = (to_underlying (cu->header.sect_off)
18979 + read_1_byte (abfd, info_ptr));
18983 DW_UNSND (attr) = (to_underlying (cu->header.sect_off)
18984 + read_2_bytes (abfd, info_ptr));
18988 DW_UNSND (attr) = (to_underlying (cu->header.sect_off)
18989 + read_4_bytes (abfd, info_ptr));
18993 DW_UNSND (attr) = (to_underlying (cu->header.sect_off)
18994 + read_8_bytes (abfd, info_ptr));
18997 case DW_FORM_ref_sig8:
18998 DW_SIGNATURE (attr) = read_8_bytes (abfd, info_ptr);
19001 case DW_FORM_ref_udata:
19002 DW_UNSND (attr) = (to_underlying (cu->header.sect_off)
19003 + read_unsigned_leb128 (abfd, info_ptr, &bytes_read));
19004 info_ptr += bytes_read;
19006 case DW_FORM_indirect:
19007 form = read_unsigned_leb128 (abfd, info_ptr, &bytes_read);
19008 info_ptr += bytes_read;
19009 if (form == DW_FORM_implicit_const)
19011 implicit_const = read_signed_leb128 (abfd, info_ptr, &bytes_read);
19012 info_ptr += bytes_read;
19014 info_ptr = read_attribute_value (reader, attr, form, implicit_const,
19017 case DW_FORM_implicit_const:
19018 DW_SND (attr) = implicit_const;
19020 case DW_FORM_GNU_addr_index:
19021 if (reader->dwo_file == NULL)
19023 /* For now flag a hard error.
19024 Later we can turn this into a complaint. */
19025 error (_("Dwarf Error: %s found in non-DWO CU [in module %s]"),
19026 dwarf_form_name (form),
19027 bfd_get_filename (abfd));
19029 DW_ADDR (attr) = read_addr_index_from_leb128 (cu, info_ptr, &bytes_read);
19030 info_ptr += bytes_read;
19032 case DW_FORM_GNU_str_index:
19033 if (reader->dwo_file == NULL)
19035 /* For now flag a hard error.
19036 Later we can turn this into a complaint if warranted. */
19037 error (_("Dwarf Error: %s found in non-DWO CU [in module %s]"),
19038 dwarf_form_name (form),
19039 bfd_get_filename (abfd));
19042 ULONGEST str_index =
19043 read_unsigned_leb128 (abfd, info_ptr, &bytes_read);
19045 DW_STRING (attr) = read_str_index (reader, str_index);
19046 DW_STRING_IS_CANONICAL (attr) = 0;
19047 info_ptr += bytes_read;
19051 error (_("Dwarf Error: Cannot handle %s in DWARF reader [in module %s]"),
19052 dwarf_form_name (form),
19053 bfd_get_filename (abfd));
19057 if (cu->per_cu->is_dwz && attr_form_is_ref (attr))
19058 attr->form = DW_FORM_GNU_ref_alt;
19060 /* We have seen instances where the compiler tried to emit a byte
19061 size attribute of -1 which ended up being encoded as an unsigned
19062 0xffffffff. Although 0xffffffff is technically a valid size value,
19063 an object of this size seems pretty unlikely so we can relatively
19064 safely treat these cases as if the size attribute was invalid and
19065 treat them as zero by default. */
19066 if (attr->name == DW_AT_byte_size
19067 && form == DW_FORM_data4
19068 && DW_UNSND (attr) >= 0xffffffff)
19071 (_("Suspicious DW_AT_byte_size value treated as zero instead of %s"),
19072 hex_string (DW_UNSND (attr)));
19073 DW_UNSND (attr) = 0;
19079 /* Read an attribute described by an abbreviated attribute. */
19081 static const gdb_byte *
19082 read_attribute (const struct die_reader_specs *reader,
19083 struct attribute *attr, struct attr_abbrev *abbrev,
19084 const gdb_byte *info_ptr)
19086 attr->name = abbrev->name;
19087 return read_attribute_value (reader, attr, abbrev->form,
19088 abbrev->implicit_const, info_ptr);
19091 /* Read dwarf information from a buffer. */
19093 static unsigned int
19094 read_1_byte (bfd *abfd, const gdb_byte *buf)
19096 return bfd_get_8 (abfd, buf);
19100 read_1_signed_byte (bfd *abfd, const gdb_byte *buf)
19102 return bfd_get_signed_8 (abfd, buf);
19105 static unsigned int
19106 read_2_bytes (bfd *abfd, const gdb_byte *buf)
19108 return bfd_get_16 (abfd, buf);
19112 read_2_signed_bytes (bfd *abfd, const gdb_byte *buf)
19114 return bfd_get_signed_16 (abfd, buf);
19117 static unsigned int
19118 read_4_bytes (bfd *abfd, const gdb_byte *buf)
19120 return bfd_get_32 (abfd, buf);
19124 read_4_signed_bytes (bfd *abfd, const gdb_byte *buf)
19126 return bfd_get_signed_32 (abfd, buf);
19130 read_8_bytes (bfd *abfd, const gdb_byte *buf)
19132 return bfd_get_64 (abfd, buf);
19136 read_address (bfd *abfd, const gdb_byte *buf, struct dwarf2_cu *cu,
19137 unsigned int *bytes_read)
19139 struct comp_unit_head *cu_header = &cu->header;
19140 CORE_ADDR retval = 0;
19142 if (cu_header->signed_addr_p)
19144 switch (cu_header->addr_size)
19147 retval = bfd_get_signed_16 (abfd, buf);
19150 retval = bfd_get_signed_32 (abfd, buf);
19153 retval = bfd_get_signed_64 (abfd, buf);
19156 internal_error (__FILE__, __LINE__,
19157 _("read_address: bad switch, signed [in module %s]"),
19158 bfd_get_filename (abfd));
19163 switch (cu_header->addr_size)
19166 retval = bfd_get_16 (abfd, buf);
19169 retval = bfd_get_32 (abfd, buf);
19172 retval = bfd_get_64 (abfd, buf);
19175 internal_error (__FILE__, __LINE__,
19176 _("read_address: bad switch, "
19177 "unsigned [in module %s]"),
19178 bfd_get_filename (abfd));
19182 *bytes_read = cu_header->addr_size;
19186 /* Read the initial length from a section. The (draft) DWARF 3
19187 specification allows the initial length to take up either 4 bytes
19188 or 12 bytes. If the first 4 bytes are 0xffffffff, then the next 8
19189 bytes describe the length and all offsets will be 8 bytes in length
19192 An older, non-standard 64-bit format is also handled by this
19193 function. The older format in question stores the initial length
19194 as an 8-byte quantity without an escape value. Lengths greater
19195 than 2^32 aren't very common which means that the initial 4 bytes
19196 is almost always zero. Since a length value of zero doesn't make
19197 sense for the 32-bit format, this initial zero can be considered to
19198 be an escape value which indicates the presence of the older 64-bit
19199 format. As written, the code can't detect (old format) lengths
19200 greater than 4GB. If it becomes necessary to handle lengths
19201 somewhat larger than 4GB, we could allow other small values (such
19202 as the non-sensical values of 1, 2, and 3) to also be used as
19203 escape values indicating the presence of the old format.
19205 The value returned via bytes_read should be used to increment the
19206 relevant pointer after calling read_initial_length().
19208 [ Note: read_initial_length() and read_offset() are based on the
19209 document entitled "DWARF Debugging Information Format", revision
19210 3, draft 8, dated November 19, 2001. This document was obtained
19213 http://reality.sgiweb.org/davea/dwarf3-draft8-011125.pdf
19215 This document is only a draft and is subject to change. (So beware.)
19217 Details regarding the older, non-standard 64-bit format were
19218 determined empirically by examining 64-bit ELF files produced by
19219 the SGI toolchain on an IRIX 6.5 machine.
19221 - Kevin, July 16, 2002
19225 read_initial_length (bfd *abfd, const gdb_byte *buf, unsigned int *bytes_read)
19227 LONGEST length = bfd_get_32 (abfd, buf);
19229 if (length == 0xffffffff)
19231 length = bfd_get_64 (abfd, buf + 4);
19234 else if (length == 0)
19236 /* Handle the (non-standard) 64-bit DWARF2 format used by IRIX. */
19237 length = bfd_get_64 (abfd, buf);
19248 /* Cover function for read_initial_length.
19249 Returns the length of the object at BUF, and stores the size of the
19250 initial length in *BYTES_READ and stores the size that offsets will be in
19252 If the initial length size is not equivalent to that specified in
19253 CU_HEADER then issue a complaint.
19254 This is useful when reading non-comp-unit headers. */
19257 read_checked_initial_length_and_offset (bfd *abfd, const gdb_byte *buf,
19258 const struct comp_unit_head *cu_header,
19259 unsigned int *bytes_read,
19260 unsigned int *offset_size)
19262 LONGEST length = read_initial_length (abfd, buf, bytes_read);
19264 gdb_assert (cu_header->initial_length_size == 4
19265 || cu_header->initial_length_size == 8
19266 || cu_header->initial_length_size == 12);
19268 if (cu_header->initial_length_size != *bytes_read)
19269 complaint (_("intermixed 32-bit and 64-bit DWARF sections"));
19271 *offset_size = (*bytes_read == 4) ? 4 : 8;
19275 /* Read an offset from the data stream. The size of the offset is
19276 given by cu_header->offset_size. */
19279 read_offset (bfd *abfd, const gdb_byte *buf,
19280 const struct comp_unit_head *cu_header,
19281 unsigned int *bytes_read)
19283 LONGEST offset = read_offset_1 (abfd, buf, cu_header->offset_size);
19285 *bytes_read = cu_header->offset_size;
19289 /* Read an offset from the data stream. */
19292 read_offset_1 (bfd *abfd, const gdb_byte *buf, unsigned int offset_size)
19294 LONGEST retval = 0;
19296 switch (offset_size)
19299 retval = bfd_get_32 (abfd, buf);
19302 retval = bfd_get_64 (abfd, buf);
19305 internal_error (__FILE__, __LINE__,
19306 _("read_offset_1: bad switch [in module %s]"),
19307 bfd_get_filename (abfd));
19313 static const gdb_byte *
19314 read_n_bytes (bfd *abfd, const gdb_byte *buf, unsigned int size)
19316 /* If the size of a host char is 8 bits, we can return a pointer
19317 to the buffer, otherwise we have to copy the data to a buffer
19318 allocated on the temporary obstack. */
19319 gdb_assert (HOST_CHAR_BIT == 8);
19323 static const char *
19324 read_direct_string (bfd *abfd, const gdb_byte *buf,
19325 unsigned int *bytes_read_ptr)
19327 /* If the size of a host char is 8 bits, we can return a pointer
19328 to the string, otherwise we have to copy the string to a buffer
19329 allocated on the temporary obstack. */
19330 gdb_assert (HOST_CHAR_BIT == 8);
19333 *bytes_read_ptr = 1;
19336 *bytes_read_ptr = strlen ((const char *) buf) + 1;
19337 return (const char *) buf;
19340 /* Return pointer to string at section SECT offset STR_OFFSET with error
19341 reporting strings FORM_NAME and SECT_NAME. */
19343 static const char *
19344 read_indirect_string_at_offset_from (struct objfile *objfile,
19345 bfd *abfd, LONGEST str_offset,
19346 struct dwarf2_section_info *sect,
19347 const char *form_name,
19348 const char *sect_name)
19350 dwarf2_read_section (objfile, sect);
19351 if (sect->buffer == NULL)
19352 error (_("%s used without %s section [in module %s]"),
19353 form_name, sect_name, bfd_get_filename (abfd));
19354 if (str_offset >= sect->size)
19355 error (_("%s pointing outside of %s section [in module %s]"),
19356 form_name, sect_name, bfd_get_filename (abfd));
19357 gdb_assert (HOST_CHAR_BIT == 8);
19358 if (sect->buffer[str_offset] == '\0')
19360 return (const char *) (sect->buffer + str_offset);
19363 /* Return pointer to string at .debug_str offset STR_OFFSET. */
19365 static const char *
19366 read_indirect_string_at_offset (struct dwarf2_per_objfile *dwarf2_per_objfile,
19367 bfd *abfd, LONGEST str_offset)
19369 return read_indirect_string_at_offset_from (dwarf2_per_objfile->objfile,
19371 &dwarf2_per_objfile->str,
19372 "DW_FORM_strp", ".debug_str");
19375 /* Return pointer to string at .debug_line_str offset STR_OFFSET. */
19377 static const char *
19378 read_indirect_line_string_at_offset (struct dwarf2_per_objfile *dwarf2_per_objfile,
19379 bfd *abfd, LONGEST str_offset)
19381 return read_indirect_string_at_offset_from (dwarf2_per_objfile->objfile,
19383 &dwarf2_per_objfile->line_str,
19384 "DW_FORM_line_strp",
19385 ".debug_line_str");
19388 /* Read a string at offset STR_OFFSET in the .debug_str section from
19389 the .dwz file DWZ. Throw an error if the offset is too large. If
19390 the string consists of a single NUL byte, return NULL; otherwise
19391 return a pointer to the string. */
19393 static const char *
19394 read_indirect_string_from_dwz (struct objfile *objfile, struct dwz_file *dwz,
19395 LONGEST str_offset)
19397 dwarf2_read_section (objfile, &dwz->str);
19399 if (dwz->str.buffer == NULL)
19400 error (_("DW_FORM_GNU_strp_alt used without .debug_str "
19401 "section [in module %s]"),
19402 bfd_get_filename (dwz->dwz_bfd));
19403 if (str_offset >= dwz->str.size)
19404 error (_("DW_FORM_GNU_strp_alt pointing outside of "
19405 ".debug_str section [in module %s]"),
19406 bfd_get_filename (dwz->dwz_bfd));
19407 gdb_assert (HOST_CHAR_BIT == 8);
19408 if (dwz->str.buffer[str_offset] == '\0')
19410 return (const char *) (dwz->str.buffer + str_offset);
19413 /* Return pointer to string at .debug_str offset as read from BUF.
19414 BUF is assumed to be in a compilation unit described by CU_HEADER.
19415 Return *BYTES_READ_PTR count of bytes read from BUF. */
19417 static const char *
19418 read_indirect_string (struct dwarf2_per_objfile *dwarf2_per_objfile, bfd *abfd,
19419 const gdb_byte *buf,
19420 const struct comp_unit_head *cu_header,
19421 unsigned int *bytes_read_ptr)
19423 LONGEST str_offset = read_offset (abfd, buf, cu_header, bytes_read_ptr);
19425 return read_indirect_string_at_offset (dwarf2_per_objfile, abfd, str_offset);
19428 /* Return pointer to string at .debug_line_str offset as read from BUF.
19429 BUF is assumed to be in a compilation unit described by CU_HEADER.
19430 Return *BYTES_READ_PTR count of bytes read from BUF. */
19432 static const char *
19433 read_indirect_line_string (struct dwarf2_per_objfile *dwarf2_per_objfile,
19434 bfd *abfd, const gdb_byte *buf,
19435 const struct comp_unit_head *cu_header,
19436 unsigned int *bytes_read_ptr)
19438 LONGEST str_offset = read_offset (abfd, buf, cu_header, bytes_read_ptr);
19440 return read_indirect_line_string_at_offset (dwarf2_per_objfile, abfd,
19445 read_unsigned_leb128 (bfd *abfd, const gdb_byte *buf,
19446 unsigned int *bytes_read_ptr)
19449 unsigned int num_read;
19451 unsigned char byte;
19458 byte = bfd_get_8 (abfd, buf);
19461 result |= ((ULONGEST) (byte & 127) << shift);
19462 if ((byte & 128) == 0)
19468 *bytes_read_ptr = num_read;
19473 read_signed_leb128 (bfd *abfd, const gdb_byte *buf,
19474 unsigned int *bytes_read_ptr)
19477 int shift, num_read;
19478 unsigned char byte;
19485 byte = bfd_get_8 (abfd, buf);
19488 result |= ((LONGEST) (byte & 127) << shift);
19490 if ((byte & 128) == 0)
19495 if ((shift < 8 * sizeof (result)) && (byte & 0x40))
19496 result |= -(((LONGEST) 1) << shift);
19497 *bytes_read_ptr = num_read;
19501 /* Given index ADDR_INDEX in .debug_addr, fetch the value.
19502 ADDR_BASE is the DW_AT_GNU_addr_base attribute or zero.
19503 ADDR_SIZE is the size of addresses from the CU header. */
19506 read_addr_index_1 (struct dwarf2_per_objfile *dwarf2_per_objfile,
19507 unsigned int addr_index, ULONGEST addr_base, int addr_size)
19509 struct objfile *objfile = dwarf2_per_objfile->objfile;
19510 bfd *abfd = objfile->obfd;
19511 const gdb_byte *info_ptr;
19513 dwarf2_read_section (objfile, &dwarf2_per_objfile->addr);
19514 if (dwarf2_per_objfile->addr.buffer == NULL)
19515 error (_("DW_FORM_addr_index used without .debug_addr section [in module %s]"),
19516 objfile_name (objfile));
19517 if (addr_base + addr_index * addr_size >= dwarf2_per_objfile->addr.size)
19518 error (_("DW_FORM_addr_index pointing outside of "
19519 ".debug_addr section [in module %s]"),
19520 objfile_name (objfile));
19521 info_ptr = (dwarf2_per_objfile->addr.buffer
19522 + addr_base + addr_index * addr_size);
19523 if (addr_size == 4)
19524 return bfd_get_32 (abfd, info_ptr);
19526 return bfd_get_64 (abfd, info_ptr);
19529 /* Given index ADDR_INDEX in .debug_addr, fetch the value. */
19532 read_addr_index (struct dwarf2_cu *cu, unsigned int addr_index)
19534 return read_addr_index_1 (cu->per_cu->dwarf2_per_objfile, addr_index,
19535 cu->addr_base, cu->header.addr_size);
19538 /* Given a pointer to an leb128 value, fetch the value from .debug_addr. */
19541 read_addr_index_from_leb128 (struct dwarf2_cu *cu, const gdb_byte *info_ptr,
19542 unsigned int *bytes_read)
19544 bfd *abfd = cu->per_cu->dwarf2_per_objfile->objfile->obfd;
19545 unsigned int addr_index = read_unsigned_leb128 (abfd, info_ptr, bytes_read);
19547 return read_addr_index (cu, addr_index);
19550 /* Data structure to pass results from dwarf2_read_addr_index_reader
19551 back to dwarf2_read_addr_index. */
19553 struct dwarf2_read_addr_index_data
19555 ULONGEST addr_base;
19559 /* die_reader_func for dwarf2_read_addr_index. */
19562 dwarf2_read_addr_index_reader (const struct die_reader_specs *reader,
19563 const gdb_byte *info_ptr,
19564 struct die_info *comp_unit_die,
19568 struct dwarf2_cu *cu = reader->cu;
19569 struct dwarf2_read_addr_index_data *aidata =
19570 (struct dwarf2_read_addr_index_data *) data;
19572 aidata->addr_base = cu->addr_base;
19573 aidata->addr_size = cu->header.addr_size;
19576 /* Given an index in .debug_addr, fetch the value.
19577 NOTE: This can be called during dwarf expression evaluation,
19578 long after the debug information has been read, and thus per_cu->cu
19579 may no longer exist. */
19582 dwarf2_read_addr_index (struct dwarf2_per_cu_data *per_cu,
19583 unsigned int addr_index)
19585 struct dwarf2_per_objfile *dwarf2_per_objfile = per_cu->dwarf2_per_objfile;
19586 struct dwarf2_cu *cu = per_cu->cu;
19587 ULONGEST addr_base;
19590 /* We need addr_base and addr_size.
19591 If we don't have PER_CU->cu, we have to get it.
19592 Nasty, but the alternative is storing the needed info in PER_CU,
19593 which at this point doesn't seem justified: it's not clear how frequently
19594 it would get used and it would increase the size of every PER_CU.
19595 Entry points like dwarf2_per_cu_addr_size do a similar thing
19596 so we're not in uncharted territory here.
19597 Alas we need to be a bit more complicated as addr_base is contained
19600 We don't need to read the entire CU(/TU).
19601 We just need the header and top level die.
19603 IWBN to use the aging mechanism to let us lazily later discard the CU.
19604 For now we skip this optimization. */
19608 addr_base = cu->addr_base;
19609 addr_size = cu->header.addr_size;
19613 struct dwarf2_read_addr_index_data aidata;
19615 /* Note: We can't use init_cutu_and_read_dies_simple here,
19616 we need addr_base. */
19617 init_cutu_and_read_dies (per_cu, NULL, 0, 0, false,
19618 dwarf2_read_addr_index_reader, &aidata);
19619 addr_base = aidata.addr_base;
19620 addr_size = aidata.addr_size;
19623 return read_addr_index_1 (dwarf2_per_objfile, addr_index, addr_base,
19627 /* Given a DW_FORM_GNU_str_index, fetch the string.
19628 This is only used by the Fission support. */
19630 static const char *
19631 read_str_index (const struct die_reader_specs *reader, ULONGEST str_index)
19633 struct dwarf2_cu *cu = reader->cu;
19634 struct dwarf2_per_objfile *dwarf2_per_objfile
19635 = cu->per_cu->dwarf2_per_objfile;
19636 struct objfile *objfile = dwarf2_per_objfile->objfile;
19637 const char *objf_name = objfile_name (objfile);
19638 bfd *abfd = objfile->obfd;
19639 struct dwarf2_section_info *str_section = &reader->dwo_file->sections.str;
19640 struct dwarf2_section_info *str_offsets_section =
19641 &reader->dwo_file->sections.str_offsets;
19642 const gdb_byte *info_ptr;
19643 ULONGEST str_offset;
19644 static const char form_name[] = "DW_FORM_GNU_str_index";
19646 dwarf2_read_section (objfile, str_section);
19647 dwarf2_read_section (objfile, str_offsets_section);
19648 if (str_section->buffer == NULL)
19649 error (_("%s used without .debug_str.dwo section"
19650 " in CU at offset %s [in module %s]"),
19651 form_name, sect_offset_str (cu->header.sect_off), objf_name);
19652 if (str_offsets_section->buffer == NULL)
19653 error (_("%s used without .debug_str_offsets.dwo section"
19654 " in CU at offset %s [in module %s]"),
19655 form_name, sect_offset_str (cu->header.sect_off), objf_name);
19656 if (str_index * cu->header.offset_size >= str_offsets_section->size)
19657 error (_("%s pointing outside of .debug_str_offsets.dwo"
19658 " section in CU at offset %s [in module %s]"),
19659 form_name, sect_offset_str (cu->header.sect_off), objf_name);
19660 info_ptr = (str_offsets_section->buffer
19661 + str_index * cu->header.offset_size);
19662 if (cu->header.offset_size == 4)
19663 str_offset = bfd_get_32 (abfd, info_ptr);
19665 str_offset = bfd_get_64 (abfd, info_ptr);
19666 if (str_offset >= str_section->size)
19667 error (_("Offset from %s pointing outside of"
19668 " .debug_str.dwo section in CU at offset %s [in module %s]"),
19669 form_name, sect_offset_str (cu->header.sect_off), objf_name);
19670 return (const char *) (str_section->buffer + str_offset);
19673 /* Return the length of an LEB128 number in BUF. */
19676 leb128_size (const gdb_byte *buf)
19678 const gdb_byte *begin = buf;
19684 if ((byte & 128) == 0)
19685 return buf - begin;
19690 set_cu_language (unsigned int lang, struct dwarf2_cu *cu)
19699 cu->language = language_c;
19702 case DW_LANG_C_plus_plus:
19703 case DW_LANG_C_plus_plus_11:
19704 case DW_LANG_C_plus_plus_14:
19705 cu->language = language_cplus;
19708 cu->language = language_d;
19710 case DW_LANG_Fortran77:
19711 case DW_LANG_Fortran90:
19712 case DW_LANG_Fortran95:
19713 case DW_LANG_Fortran03:
19714 case DW_LANG_Fortran08:
19715 cu->language = language_fortran;
19718 cu->language = language_go;
19720 case DW_LANG_Mips_Assembler:
19721 cu->language = language_asm;
19723 case DW_LANG_Ada83:
19724 case DW_LANG_Ada95:
19725 cu->language = language_ada;
19727 case DW_LANG_Modula2:
19728 cu->language = language_m2;
19730 case DW_LANG_Pascal83:
19731 cu->language = language_pascal;
19734 cu->language = language_objc;
19737 case DW_LANG_Rust_old:
19738 cu->language = language_rust;
19740 case DW_LANG_Cobol74:
19741 case DW_LANG_Cobol85:
19743 cu->language = language_minimal;
19746 cu->language_defn = language_def (cu->language);
19749 /* Return the named attribute or NULL if not there. */
19751 static struct attribute *
19752 dwarf2_attr (struct die_info *die, unsigned int name, struct dwarf2_cu *cu)
19757 struct attribute *spec = NULL;
19759 for (i = 0; i < die->num_attrs; ++i)
19761 if (die->attrs[i].name == name)
19762 return &die->attrs[i];
19763 if (die->attrs[i].name == DW_AT_specification
19764 || die->attrs[i].name == DW_AT_abstract_origin)
19765 spec = &die->attrs[i];
19771 die = follow_die_ref (die, spec, &cu);
19777 /* Return the named attribute or NULL if not there,
19778 but do not follow DW_AT_specification, etc.
19779 This is for use in contexts where we're reading .debug_types dies.
19780 Following DW_AT_specification, DW_AT_abstract_origin will take us
19781 back up the chain, and we want to go down. */
19783 static struct attribute *
19784 dwarf2_attr_no_follow (struct die_info *die, unsigned int name)
19788 for (i = 0; i < die->num_attrs; ++i)
19789 if (die->attrs[i].name == name)
19790 return &die->attrs[i];
19795 /* Return the string associated with a string-typed attribute, or NULL if it
19796 is either not found or is of an incorrect type. */
19798 static const char *
19799 dwarf2_string_attr (struct die_info *die, unsigned int name, struct dwarf2_cu *cu)
19801 struct attribute *attr;
19802 const char *str = NULL;
19804 attr = dwarf2_attr (die, name, cu);
19808 if (attr->form == DW_FORM_strp || attr->form == DW_FORM_line_strp
19809 || attr->form == DW_FORM_string
19810 || attr->form == DW_FORM_GNU_str_index
19811 || attr->form == DW_FORM_GNU_strp_alt)
19812 str = DW_STRING (attr);
19814 complaint (_("string type expected for attribute %s for "
19815 "DIE at %s in module %s"),
19816 dwarf_attr_name (name), sect_offset_str (die->sect_off),
19817 objfile_name (cu->per_cu->dwarf2_per_objfile->objfile));
19823 /* Return non-zero iff the attribute NAME is defined for the given DIE,
19824 and holds a non-zero value. This function should only be used for
19825 DW_FORM_flag or DW_FORM_flag_present attributes. */
19828 dwarf2_flag_true_p (struct die_info *die, unsigned name, struct dwarf2_cu *cu)
19830 struct attribute *attr = dwarf2_attr (die, name, cu);
19832 return (attr && DW_UNSND (attr));
19836 die_is_declaration (struct die_info *die, struct dwarf2_cu *cu)
19838 /* A DIE is a declaration if it has a DW_AT_declaration attribute
19839 which value is non-zero. However, we have to be careful with
19840 DIEs having a DW_AT_specification attribute, because dwarf2_attr()
19841 (via dwarf2_flag_true_p) follows this attribute. So we may
19842 end up accidently finding a declaration attribute that belongs
19843 to a different DIE referenced by the specification attribute,
19844 even though the given DIE does not have a declaration attribute. */
19845 return (dwarf2_flag_true_p (die, DW_AT_declaration, cu)
19846 && dwarf2_attr (die, DW_AT_specification, cu) == NULL);
19849 /* Return the die giving the specification for DIE, if there is
19850 one. *SPEC_CU is the CU containing DIE on input, and the CU
19851 containing the return value on output. If there is no
19852 specification, but there is an abstract origin, that is
19855 static struct die_info *
19856 die_specification (struct die_info *die, struct dwarf2_cu **spec_cu)
19858 struct attribute *spec_attr = dwarf2_attr (die, DW_AT_specification,
19861 if (spec_attr == NULL)
19862 spec_attr = dwarf2_attr (die, DW_AT_abstract_origin, *spec_cu);
19864 if (spec_attr == NULL)
19867 return follow_die_ref (die, spec_attr, spec_cu);
19870 /* Stub for free_line_header to match void * callback types. */
19873 free_line_header_voidp (void *arg)
19875 struct line_header *lh = (struct line_header *) arg;
19881 line_header::add_include_dir (const char *include_dir)
19883 if (dwarf_line_debug >= 2)
19884 fprintf_unfiltered (gdb_stdlog, "Adding dir %zu: %s\n",
19885 include_dirs.size () + 1, include_dir);
19887 include_dirs.push_back (include_dir);
19891 line_header::add_file_name (const char *name,
19893 unsigned int mod_time,
19894 unsigned int length)
19896 if (dwarf_line_debug >= 2)
19897 fprintf_unfiltered (gdb_stdlog, "Adding file %u: %s\n",
19898 (unsigned) file_names.size () + 1, name);
19900 file_names.emplace_back (name, d_index, mod_time, length);
19903 /* A convenience function to find the proper .debug_line section for a CU. */
19905 static struct dwarf2_section_info *
19906 get_debug_line_section (struct dwarf2_cu *cu)
19908 struct dwarf2_section_info *section;
19909 struct dwarf2_per_objfile *dwarf2_per_objfile
19910 = cu->per_cu->dwarf2_per_objfile;
19912 /* For TUs in DWO files, the DW_AT_stmt_list attribute lives in the
19914 if (cu->dwo_unit && cu->per_cu->is_debug_types)
19915 section = &cu->dwo_unit->dwo_file->sections.line;
19916 else if (cu->per_cu->is_dwz)
19918 struct dwz_file *dwz = dwarf2_get_dwz_file (dwarf2_per_objfile);
19920 section = &dwz->line;
19923 section = &dwarf2_per_objfile->line;
19928 /* Read directory or file name entry format, starting with byte of
19929 format count entries, ULEB128 pairs of entry formats, ULEB128 of
19930 entries count and the entries themselves in the described entry
19934 read_formatted_entries (struct dwarf2_per_objfile *dwarf2_per_objfile,
19935 bfd *abfd, const gdb_byte **bufp,
19936 struct line_header *lh,
19937 const struct comp_unit_head *cu_header,
19938 void (*callback) (struct line_header *lh,
19941 unsigned int mod_time,
19942 unsigned int length))
19944 gdb_byte format_count, formati;
19945 ULONGEST data_count, datai;
19946 const gdb_byte *buf = *bufp;
19947 const gdb_byte *format_header_data;
19948 unsigned int bytes_read;
19950 format_count = read_1_byte (abfd, buf);
19952 format_header_data = buf;
19953 for (formati = 0; formati < format_count; formati++)
19955 read_unsigned_leb128 (abfd, buf, &bytes_read);
19957 read_unsigned_leb128 (abfd, buf, &bytes_read);
19961 data_count = read_unsigned_leb128 (abfd, buf, &bytes_read);
19963 for (datai = 0; datai < data_count; datai++)
19965 const gdb_byte *format = format_header_data;
19966 struct file_entry fe;
19968 for (formati = 0; formati < format_count; formati++)
19970 ULONGEST content_type = read_unsigned_leb128 (abfd, format, &bytes_read);
19971 format += bytes_read;
19973 ULONGEST form = read_unsigned_leb128 (abfd, format, &bytes_read);
19974 format += bytes_read;
19976 gdb::optional<const char *> string;
19977 gdb::optional<unsigned int> uint;
19981 case DW_FORM_string:
19982 string.emplace (read_direct_string (abfd, buf, &bytes_read));
19986 case DW_FORM_line_strp:
19987 string.emplace (read_indirect_line_string (dwarf2_per_objfile,
19994 case DW_FORM_data1:
19995 uint.emplace (read_1_byte (abfd, buf));
19999 case DW_FORM_data2:
20000 uint.emplace (read_2_bytes (abfd, buf));
20004 case DW_FORM_data4:
20005 uint.emplace (read_4_bytes (abfd, buf));
20009 case DW_FORM_data8:
20010 uint.emplace (read_8_bytes (abfd, buf));
20014 case DW_FORM_udata:
20015 uint.emplace (read_unsigned_leb128 (abfd, buf, &bytes_read));
20019 case DW_FORM_block:
20020 /* It is valid only for DW_LNCT_timestamp which is ignored by
20025 switch (content_type)
20028 if (string.has_value ())
20031 case DW_LNCT_directory_index:
20032 if (uint.has_value ())
20033 fe.d_index = (dir_index) *uint;
20035 case DW_LNCT_timestamp:
20036 if (uint.has_value ())
20037 fe.mod_time = *uint;
20040 if (uint.has_value ())
20046 complaint (_("Unknown format content type %s"),
20047 pulongest (content_type));
20051 callback (lh, fe.name, fe.d_index, fe.mod_time, fe.length);
20057 /* Read the statement program header starting at OFFSET in
20058 .debug_line, or .debug_line.dwo. Return a pointer
20059 to a struct line_header, allocated using xmalloc.
20060 Returns NULL if there is a problem reading the header, e.g., if it
20061 has a version we don't understand.
20063 NOTE: the strings in the include directory and file name tables of
20064 the returned object point into the dwarf line section buffer,
20065 and must not be freed. */
20067 static line_header_up
20068 dwarf_decode_line_header (sect_offset sect_off, struct dwarf2_cu *cu)
20070 const gdb_byte *line_ptr;
20071 unsigned int bytes_read, offset_size;
20073 const char *cur_dir, *cur_file;
20074 struct dwarf2_section_info *section;
20076 struct dwarf2_per_objfile *dwarf2_per_objfile
20077 = cu->per_cu->dwarf2_per_objfile;
20079 section = get_debug_line_section (cu);
20080 dwarf2_read_section (dwarf2_per_objfile->objfile, section);
20081 if (section->buffer == NULL)
20083 if (cu->dwo_unit && cu->per_cu->is_debug_types)
20084 complaint (_("missing .debug_line.dwo section"));
20086 complaint (_("missing .debug_line section"));
20090 /* We can't do this until we know the section is non-empty.
20091 Only then do we know we have such a section. */
20092 abfd = get_section_bfd_owner (section);
20094 /* Make sure that at least there's room for the total_length field.
20095 That could be 12 bytes long, but we're just going to fudge that. */
20096 if (to_underlying (sect_off) + 4 >= section->size)
20098 dwarf2_statement_list_fits_in_line_number_section_complaint ();
20102 line_header_up lh (new line_header ());
20104 lh->sect_off = sect_off;
20105 lh->offset_in_dwz = cu->per_cu->is_dwz;
20107 line_ptr = section->buffer + to_underlying (sect_off);
20109 /* Read in the header. */
20111 read_checked_initial_length_and_offset (abfd, line_ptr, &cu->header,
20112 &bytes_read, &offset_size);
20113 line_ptr += bytes_read;
20114 if (line_ptr + lh->total_length > (section->buffer + section->size))
20116 dwarf2_statement_list_fits_in_line_number_section_complaint ();
20119 lh->statement_program_end = line_ptr + lh->total_length;
20120 lh->version = read_2_bytes (abfd, line_ptr);
20122 if (lh->version > 5)
20124 /* This is a version we don't understand. The format could have
20125 changed in ways we don't handle properly so just punt. */
20126 complaint (_("unsupported version in .debug_line section"));
20129 if (lh->version >= 5)
20131 gdb_byte segment_selector_size;
20133 /* Skip address size. */
20134 read_1_byte (abfd, line_ptr);
20137 segment_selector_size = read_1_byte (abfd, line_ptr);
20139 if (segment_selector_size != 0)
20141 complaint (_("unsupported segment selector size %u "
20142 "in .debug_line section"),
20143 segment_selector_size);
20147 lh->header_length = read_offset_1 (abfd, line_ptr, offset_size);
20148 line_ptr += offset_size;
20149 lh->minimum_instruction_length = read_1_byte (abfd, line_ptr);
20151 if (lh->version >= 4)
20153 lh->maximum_ops_per_instruction = read_1_byte (abfd, line_ptr);
20157 lh->maximum_ops_per_instruction = 1;
20159 if (lh->maximum_ops_per_instruction == 0)
20161 lh->maximum_ops_per_instruction = 1;
20162 complaint (_("invalid maximum_ops_per_instruction "
20163 "in `.debug_line' section"));
20166 lh->default_is_stmt = read_1_byte (abfd, line_ptr);
20168 lh->line_base = read_1_signed_byte (abfd, line_ptr);
20170 lh->line_range = read_1_byte (abfd, line_ptr);
20172 lh->opcode_base = read_1_byte (abfd, line_ptr);
20174 lh->standard_opcode_lengths.reset (new unsigned char[lh->opcode_base]);
20176 lh->standard_opcode_lengths[0] = 1; /* This should never be used anyway. */
20177 for (i = 1; i < lh->opcode_base; ++i)
20179 lh->standard_opcode_lengths[i] = read_1_byte (abfd, line_ptr);
20183 if (lh->version >= 5)
20185 /* Read directory table. */
20186 read_formatted_entries (dwarf2_per_objfile, abfd, &line_ptr, lh.get (),
20188 [] (struct line_header *lh, const char *name,
20189 dir_index d_index, unsigned int mod_time,
20190 unsigned int length)
20192 lh->add_include_dir (name);
20195 /* Read file name table. */
20196 read_formatted_entries (dwarf2_per_objfile, abfd, &line_ptr, lh.get (),
20198 [] (struct line_header *lh, const char *name,
20199 dir_index d_index, unsigned int mod_time,
20200 unsigned int length)
20202 lh->add_file_name (name, d_index, mod_time, length);
20207 /* Read directory table. */
20208 while ((cur_dir = read_direct_string (abfd, line_ptr, &bytes_read)) != NULL)
20210 line_ptr += bytes_read;
20211 lh->add_include_dir (cur_dir);
20213 line_ptr += bytes_read;
20215 /* Read file name table. */
20216 while ((cur_file = read_direct_string (abfd, line_ptr, &bytes_read)) != NULL)
20218 unsigned int mod_time, length;
20221 line_ptr += bytes_read;
20222 d_index = (dir_index) read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
20223 line_ptr += bytes_read;
20224 mod_time = read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
20225 line_ptr += bytes_read;
20226 length = read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
20227 line_ptr += bytes_read;
20229 lh->add_file_name (cur_file, d_index, mod_time, length);
20231 line_ptr += bytes_read;
20233 lh->statement_program_start = line_ptr;
20235 if (line_ptr > (section->buffer + section->size))
20236 complaint (_("line number info header doesn't "
20237 "fit in `.debug_line' section"));
20242 /* Subroutine of dwarf_decode_lines to simplify it.
20243 Return the file name of the psymtab for included file FILE_INDEX
20244 in line header LH of PST.
20245 COMP_DIR is the compilation directory (DW_AT_comp_dir) or NULL if unknown.
20246 If space for the result is malloc'd, *NAME_HOLDER will be set.
20247 Returns NULL if FILE_INDEX should be ignored, i.e., it is pst->filename. */
20249 static const char *
20250 psymtab_include_file_name (const struct line_header *lh, int file_index,
20251 const struct partial_symtab *pst,
20252 const char *comp_dir,
20253 gdb::unique_xmalloc_ptr<char> *name_holder)
20255 const file_entry &fe = lh->file_names[file_index];
20256 const char *include_name = fe.name;
20257 const char *include_name_to_compare = include_name;
20258 const char *pst_filename;
20261 const char *dir_name = fe.include_dir (lh);
20263 gdb::unique_xmalloc_ptr<char> hold_compare;
20264 if (!IS_ABSOLUTE_PATH (include_name)
20265 && (dir_name != NULL || comp_dir != NULL))
20267 /* Avoid creating a duplicate psymtab for PST.
20268 We do this by comparing INCLUDE_NAME and PST_FILENAME.
20269 Before we do the comparison, however, we need to account
20270 for DIR_NAME and COMP_DIR.
20271 First prepend dir_name (if non-NULL). If we still don't
20272 have an absolute path prepend comp_dir (if non-NULL).
20273 However, the directory we record in the include-file's
20274 psymtab does not contain COMP_DIR (to match the
20275 corresponding symtab(s)).
20280 bash$ gcc -g ./hello.c
20281 include_name = "hello.c"
20283 DW_AT_comp_dir = comp_dir = "/tmp"
20284 DW_AT_name = "./hello.c"
20288 if (dir_name != NULL)
20290 name_holder->reset (concat (dir_name, SLASH_STRING,
20291 include_name, (char *) NULL));
20292 include_name = name_holder->get ();
20293 include_name_to_compare = include_name;
20295 if (!IS_ABSOLUTE_PATH (include_name) && comp_dir != NULL)
20297 hold_compare.reset (concat (comp_dir, SLASH_STRING,
20298 include_name, (char *) NULL));
20299 include_name_to_compare = hold_compare.get ();
20303 pst_filename = pst->filename;
20304 gdb::unique_xmalloc_ptr<char> copied_name;
20305 if (!IS_ABSOLUTE_PATH (pst_filename) && pst->dirname != NULL)
20307 copied_name.reset (concat (pst->dirname, SLASH_STRING,
20308 pst_filename, (char *) NULL));
20309 pst_filename = copied_name.get ();
20312 file_is_pst = FILENAME_CMP (include_name_to_compare, pst_filename) == 0;
20316 return include_name;
20319 /* State machine to track the state of the line number program. */
20321 class lnp_state_machine
20324 /* Initialize a machine state for the start of a line number
20326 lnp_state_machine (gdbarch *arch, line_header *lh, bool record_lines_p);
20328 file_entry *current_file ()
20330 /* lh->file_names is 0-based, but the file name numbers in the
20331 statement program are 1-based. */
20332 return m_line_header->file_name_at (m_file);
20335 /* Record the line in the state machine. END_SEQUENCE is true if
20336 we're processing the end of a sequence. */
20337 void record_line (bool end_sequence);
20339 /* Check ADDRESS is zero and less than UNRELOCATED_LOWPC and if true
20340 nop-out rest of the lines in this sequence. */
20341 void check_line_address (struct dwarf2_cu *cu,
20342 const gdb_byte *line_ptr,
20343 CORE_ADDR unrelocated_lowpc, CORE_ADDR address);
20345 void handle_set_discriminator (unsigned int discriminator)
20347 m_discriminator = discriminator;
20348 m_line_has_non_zero_discriminator |= discriminator != 0;
20351 /* Handle DW_LNE_set_address. */
20352 void handle_set_address (CORE_ADDR baseaddr, CORE_ADDR address)
20355 address += baseaddr;
20356 m_address = gdbarch_adjust_dwarf2_line (m_gdbarch, address, false);
20359 /* Handle DW_LNS_advance_pc. */
20360 void handle_advance_pc (CORE_ADDR adjust);
20362 /* Handle a special opcode. */
20363 void handle_special_opcode (unsigned char op_code);
20365 /* Handle DW_LNS_advance_line. */
20366 void handle_advance_line (int line_delta)
20368 advance_line (line_delta);
20371 /* Handle DW_LNS_set_file. */
20372 void handle_set_file (file_name_index file);
20374 /* Handle DW_LNS_negate_stmt. */
20375 void handle_negate_stmt ()
20377 m_is_stmt = !m_is_stmt;
20380 /* Handle DW_LNS_const_add_pc. */
20381 void handle_const_add_pc ();
20383 /* Handle DW_LNS_fixed_advance_pc. */
20384 void handle_fixed_advance_pc (CORE_ADDR addr_adj)
20386 m_address += gdbarch_adjust_dwarf2_line (m_gdbarch, addr_adj, true);
20390 /* Handle DW_LNS_copy. */
20391 void handle_copy ()
20393 record_line (false);
20394 m_discriminator = 0;
20397 /* Handle DW_LNE_end_sequence. */
20398 void handle_end_sequence ()
20400 m_record_line_callback = ::record_line;
20404 /* Advance the line by LINE_DELTA. */
20405 void advance_line (int line_delta)
20407 m_line += line_delta;
20409 if (line_delta != 0)
20410 m_line_has_non_zero_discriminator = m_discriminator != 0;
20413 gdbarch *m_gdbarch;
20415 /* True if we're recording lines.
20416 Otherwise we're building partial symtabs and are just interested in
20417 finding include files mentioned by the line number program. */
20418 bool m_record_lines_p;
20420 /* The line number header. */
20421 line_header *m_line_header;
20423 /* These are part of the standard DWARF line number state machine,
20424 and initialized according to the DWARF spec. */
20426 unsigned char m_op_index = 0;
20427 /* The line table index (1-based) of the current file. */
20428 file_name_index m_file = (file_name_index) 1;
20429 unsigned int m_line = 1;
20431 /* These are initialized in the constructor. */
20433 CORE_ADDR m_address;
20435 unsigned int m_discriminator;
20437 /* Additional bits of state we need to track. */
20439 /* The last file that we called dwarf2_start_subfile for.
20440 This is only used for TLLs. */
20441 unsigned int m_last_file = 0;
20442 /* The last file a line number was recorded for. */
20443 struct subfile *m_last_subfile = NULL;
20445 /* The function to call to record a line. */
20446 record_line_ftype *m_record_line_callback = NULL;
20448 /* The last line number that was recorded, used to coalesce
20449 consecutive entries for the same line. This can happen, for
20450 example, when discriminators are present. PR 17276. */
20451 unsigned int m_last_line = 0;
20452 bool m_line_has_non_zero_discriminator = false;
20456 lnp_state_machine::handle_advance_pc (CORE_ADDR adjust)
20458 CORE_ADDR addr_adj = (((m_op_index + adjust)
20459 / m_line_header->maximum_ops_per_instruction)
20460 * m_line_header->minimum_instruction_length);
20461 m_address += gdbarch_adjust_dwarf2_line (m_gdbarch, addr_adj, true);
20462 m_op_index = ((m_op_index + adjust)
20463 % m_line_header->maximum_ops_per_instruction);
20467 lnp_state_machine::handle_special_opcode (unsigned char op_code)
20469 unsigned char adj_opcode = op_code - m_line_header->opcode_base;
20470 CORE_ADDR addr_adj = (((m_op_index
20471 + (adj_opcode / m_line_header->line_range))
20472 / m_line_header->maximum_ops_per_instruction)
20473 * m_line_header->minimum_instruction_length);
20474 m_address += gdbarch_adjust_dwarf2_line (m_gdbarch, addr_adj, true);
20475 m_op_index = ((m_op_index + (adj_opcode / m_line_header->line_range))
20476 % m_line_header->maximum_ops_per_instruction);
20478 int line_delta = (m_line_header->line_base
20479 + (adj_opcode % m_line_header->line_range));
20480 advance_line (line_delta);
20481 record_line (false);
20482 m_discriminator = 0;
20486 lnp_state_machine::handle_set_file (file_name_index file)
20490 const file_entry *fe = current_file ();
20492 dwarf2_debug_line_missing_file_complaint ();
20493 else if (m_record_lines_p)
20495 const char *dir = fe->include_dir (m_line_header);
20497 m_last_subfile = current_subfile;
20498 m_line_has_non_zero_discriminator = m_discriminator != 0;
20499 dwarf2_start_subfile (fe->name, dir);
20504 lnp_state_machine::handle_const_add_pc ()
20507 = (255 - m_line_header->opcode_base) / m_line_header->line_range;
20510 = (((m_op_index + adjust)
20511 / m_line_header->maximum_ops_per_instruction)
20512 * m_line_header->minimum_instruction_length);
20514 m_address += gdbarch_adjust_dwarf2_line (m_gdbarch, addr_adj, true);
20515 m_op_index = ((m_op_index + adjust)
20516 % m_line_header->maximum_ops_per_instruction);
20519 /* Ignore this record_line request. */
20522 noop_record_line (struct subfile *subfile, int line, CORE_ADDR pc)
20527 /* Return non-zero if we should add LINE to the line number table.
20528 LINE is the line to add, LAST_LINE is the last line that was added,
20529 LAST_SUBFILE is the subfile for LAST_LINE.
20530 LINE_HAS_NON_ZERO_DISCRIMINATOR is non-zero if LINE has ever
20531 had a non-zero discriminator.
20533 We have to be careful in the presence of discriminators.
20534 E.g., for this line:
20536 for (i = 0; i < 100000; i++);
20538 clang can emit four line number entries for that one line,
20539 each with a different discriminator.
20540 See gdb.dwarf2/dw2-single-line-discriminators.exp for an example.
20542 However, we want gdb to coalesce all four entries into one.
20543 Otherwise the user could stepi into the middle of the line and
20544 gdb would get confused about whether the pc really was in the
20545 middle of the line.
20547 Things are further complicated by the fact that two consecutive
20548 line number entries for the same line is a heuristic used by gcc
20549 to denote the end of the prologue. So we can't just discard duplicate
20550 entries, we have to be selective about it. The heuristic we use is
20551 that we only collapse consecutive entries for the same line if at least
20552 one of those entries has a non-zero discriminator. PR 17276.
20554 Note: Addresses in the line number state machine can never go backwards
20555 within one sequence, thus this coalescing is ok. */
20558 dwarf_record_line_p (unsigned int line, unsigned int last_line,
20559 int line_has_non_zero_discriminator,
20560 struct subfile *last_subfile)
20562 if (current_subfile != last_subfile)
20564 if (line != last_line)
20566 /* Same line for the same file that we've seen already.
20567 As a last check, for pr 17276, only record the line if the line
20568 has never had a non-zero discriminator. */
20569 if (!line_has_non_zero_discriminator)
20574 /* Use P_RECORD_LINE to record line number LINE beginning at address ADDRESS
20575 in the line table of subfile SUBFILE. */
20578 dwarf_record_line_1 (struct gdbarch *gdbarch, struct subfile *subfile,
20579 unsigned int line, CORE_ADDR address,
20580 record_line_ftype p_record_line)
20582 CORE_ADDR addr = gdbarch_addr_bits_remove (gdbarch, address);
20584 if (dwarf_line_debug)
20586 fprintf_unfiltered (gdb_stdlog,
20587 "Recording line %u, file %s, address %s\n",
20588 line, lbasename (subfile->name),
20589 paddress (gdbarch, address));
20592 (*p_record_line) (subfile, line, addr);
20595 /* Subroutine of dwarf_decode_lines_1 to simplify it.
20596 Mark the end of a set of line number records.
20597 The arguments are the same as for dwarf_record_line_1.
20598 If SUBFILE is NULL the request is ignored. */
20601 dwarf_finish_line (struct gdbarch *gdbarch, struct subfile *subfile,
20602 CORE_ADDR address, record_line_ftype p_record_line)
20604 if (subfile == NULL)
20607 if (dwarf_line_debug)
20609 fprintf_unfiltered (gdb_stdlog,
20610 "Finishing current line, file %s, address %s\n",
20611 lbasename (subfile->name),
20612 paddress (gdbarch, address));
20615 dwarf_record_line_1 (gdbarch, subfile, 0, address, p_record_line);
20619 lnp_state_machine::record_line (bool end_sequence)
20621 if (dwarf_line_debug)
20623 fprintf_unfiltered (gdb_stdlog,
20624 "Processing actual line %u: file %u,"
20625 " address %s, is_stmt %u, discrim %u\n",
20626 m_line, to_underlying (m_file),
20627 paddress (m_gdbarch, m_address),
20628 m_is_stmt, m_discriminator);
20631 file_entry *fe = current_file ();
20634 dwarf2_debug_line_missing_file_complaint ();
20635 /* For now we ignore lines not starting on an instruction boundary.
20636 But not when processing end_sequence for compatibility with the
20637 previous version of the code. */
20638 else if (m_op_index == 0 || end_sequence)
20640 fe->included_p = 1;
20641 if (m_record_lines_p && m_is_stmt)
20643 if (m_last_subfile != current_subfile || end_sequence)
20645 dwarf_finish_line (m_gdbarch, m_last_subfile,
20646 m_address, m_record_line_callback);
20651 if (dwarf_record_line_p (m_line, m_last_line,
20652 m_line_has_non_zero_discriminator,
20655 dwarf_record_line_1 (m_gdbarch, current_subfile,
20657 m_record_line_callback);
20659 m_last_subfile = current_subfile;
20660 m_last_line = m_line;
20666 lnp_state_machine::lnp_state_machine (gdbarch *arch, line_header *lh,
20667 bool record_lines_p)
20670 m_record_lines_p = record_lines_p;
20671 m_line_header = lh;
20673 m_record_line_callback = ::record_line;
20675 /* Call `gdbarch_adjust_dwarf2_line' on the initial 0 address as if there
20676 was a line entry for it so that the backend has a chance to adjust it
20677 and also record it in case it needs it. This is currently used by MIPS
20678 code, cf. `mips_adjust_dwarf2_line'. */
20679 m_address = gdbarch_adjust_dwarf2_line (arch, 0, 0);
20680 m_is_stmt = lh->default_is_stmt;
20681 m_discriminator = 0;
20685 lnp_state_machine::check_line_address (struct dwarf2_cu *cu,
20686 const gdb_byte *line_ptr,
20687 CORE_ADDR unrelocated_lowpc, CORE_ADDR address)
20689 /* If ADDRESS < UNRELOCATED_LOWPC then it's not a usable value, it's outside
20690 the pc range of the CU. However, we restrict the test to only ADDRESS
20691 values of zero to preserve GDB's previous behaviour which is to handle
20692 the specific case of a function being GC'd by the linker. */
20694 if (address == 0 && address < unrelocated_lowpc)
20696 /* This line table is for a function which has been
20697 GCd by the linker. Ignore it. PR gdb/12528 */
20699 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
20700 long line_offset = line_ptr - get_debug_line_section (cu)->buffer;
20702 complaint (_(".debug_line address at offset 0x%lx is 0 [in module %s]"),
20703 line_offset, objfile_name (objfile));
20704 m_record_line_callback = noop_record_line;
20705 /* Note: record_line_callback is left as noop_record_line until
20706 we see DW_LNE_end_sequence. */
20710 /* Subroutine of dwarf_decode_lines to simplify it.
20711 Process the line number information in LH.
20712 If DECODE_FOR_PST_P is non-zero, all we do is process the line number
20713 program in order to set included_p for every referenced header. */
20716 dwarf_decode_lines_1 (struct line_header *lh, struct dwarf2_cu *cu,
20717 const int decode_for_pst_p, CORE_ADDR lowpc)
20719 const gdb_byte *line_ptr, *extended_end;
20720 const gdb_byte *line_end;
20721 unsigned int bytes_read, extended_len;
20722 unsigned char op_code, extended_op;
20723 CORE_ADDR baseaddr;
20724 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
20725 bfd *abfd = objfile->obfd;
20726 struct gdbarch *gdbarch = get_objfile_arch (objfile);
20727 /* True if we're recording line info (as opposed to building partial
20728 symtabs and just interested in finding include files mentioned by
20729 the line number program). */
20730 bool record_lines_p = !decode_for_pst_p;
20732 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
20734 line_ptr = lh->statement_program_start;
20735 line_end = lh->statement_program_end;
20737 /* Read the statement sequences until there's nothing left. */
20738 while (line_ptr < line_end)
20740 /* The DWARF line number program state machine. Reset the state
20741 machine at the start of each sequence. */
20742 lnp_state_machine state_machine (gdbarch, lh, record_lines_p);
20743 bool end_sequence = false;
20745 if (record_lines_p)
20747 /* Start a subfile for the current file of the state
20749 const file_entry *fe = state_machine.current_file ();
20752 dwarf2_start_subfile (fe->name, fe->include_dir (lh));
20755 /* Decode the table. */
20756 while (line_ptr < line_end && !end_sequence)
20758 op_code = read_1_byte (abfd, line_ptr);
20761 if (op_code >= lh->opcode_base)
20763 /* Special opcode. */
20764 state_machine.handle_special_opcode (op_code);
20766 else switch (op_code)
20768 case DW_LNS_extended_op:
20769 extended_len = read_unsigned_leb128 (abfd, line_ptr,
20771 line_ptr += bytes_read;
20772 extended_end = line_ptr + extended_len;
20773 extended_op = read_1_byte (abfd, line_ptr);
20775 switch (extended_op)
20777 case DW_LNE_end_sequence:
20778 state_machine.handle_end_sequence ();
20779 end_sequence = true;
20781 case DW_LNE_set_address:
20784 = read_address (abfd, line_ptr, cu, &bytes_read);
20785 line_ptr += bytes_read;
20787 state_machine.check_line_address (cu, line_ptr,
20788 lowpc - baseaddr, address);
20789 state_machine.handle_set_address (baseaddr, address);
20792 case DW_LNE_define_file:
20794 const char *cur_file;
20795 unsigned int mod_time, length;
20798 cur_file = read_direct_string (abfd, line_ptr,
20800 line_ptr += bytes_read;
20801 dindex = (dir_index)
20802 read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
20803 line_ptr += bytes_read;
20805 read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
20806 line_ptr += bytes_read;
20808 read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
20809 line_ptr += bytes_read;
20810 lh->add_file_name (cur_file, dindex, mod_time, length);
20813 case DW_LNE_set_discriminator:
20815 /* The discriminator is not interesting to the
20816 debugger; just ignore it. We still need to
20817 check its value though:
20818 if there are consecutive entries for the same
20819 (non-prologue) line we want to coalesce them.
20822 = read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
20823 line_ptr += bytes_read;
20825 state_machine.handle_set_discriminator (discr);
20829 complaint (_("mangled .debug_line section"));
20832 /* Make sure that we parsed the extended op correctly. If e.g.
20833 we expected a different address size than the producer used,
20834 we may have read the wrong number of bytes. */
20835 if (line_ptr != extended_end)
20837 complaint (_("mangled .debug_line section"));
20842 state_machine.handle_copy ();
20844 case DW_LNS_advance_pc:
20847 = read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
20848 line_ptr += bytes_read;
20850 state_machine.handle_advance_pc (adjust);
20853 case DW_LNS_advance_line:
20856 = read_signed_leb128 (abfd, line_ptr, &bytes_read);
20857 line_ptr += bytes_read;
20859 state_machine.handle_advance_line (line_delta);
20862 case DW_LNS_set_file:
20864 file_name_index file
20865 = (file_name_index) read_unsigned_leb128 (abfd, line_ptr,
20867 line_ptr += bytes_read;
20869 state_machine.handle_set_file (file);
20872 case DW_LNS_set_column:
20873 (void) read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
20874 line_ptr += bytes_read;
20876 case DW_LNS_negate_stmt:
20877 state_machine.handle_negate_stmt ();
20879 case DW_LNS_set_basic_block:
20881 /* Add to the address register of the state machine the
20882 address increment value corresponding to special opcode
20883 255. I.e., this value is scaled by the minimum
20884 instruction length since special opcode 255 would have
20885 scaled the increment. */
20886 case DW_LNS_const_add_pc:
20887 state_machine.handle_const_add_pc ();
20889 case DW_LNS_fixed_advance_pc:
20891 CORE_ADDR addr_adj = read_2_bytes (abfd, line_ptr);
20894 state_machine.handle_fixed_advance_pc (addr_adj);
20899 /* Unknown standard opcode, ignore it. */
20902 for (i = 0; i < lh->standard_opcode_lengths[op_code]; i++)
20904 (void) read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
20905 line_ptr += bytes_read;
20912 dwarf2_debug_line_missing_end_sequence_complaint ();
20914 /* We got a DW_LNE_end_sequence (or we ran off the end of the buffer,
20915 in which case we still finish recording the last line). */
20916 state_machine.record_line (true);
20920 /* Decode the Line Number Program (LNP) for the given line_header
20921 structure and CU. The actual information extracted and the type
20922 of structures created from the LNP depends on the value of PST.
20924 1. If PST is NULL, then this procedure uses the data from the program
20925 to create all necessary symbol tables, and their linetables.
20927 2. If PST is not NULL, this procedure reads the program to determine
20928 the list of files included by the unit represented by PST, and
20929 builds all the associated partial symbol tables.
20931 COMP_DIR is the compilation directory (DW_AT_comp_dir) or NULL if unknown.
20932 It is used for relative paths in the line table.
20933 NOTE: When processing partial symtabs (pst != NULL),
20934 comp_dir == pst->dirname.
20936 NOTE: It is important that psymtabs have the same file name (via strcmp)
20937 as the corresponding symtab. Since COMP_DIR is not used in the name of the
20938 symtab we don't use it in the name of the psymtabs we create.
20939 E.g. expand_line_sal requires this when finding psymtabs to expand.
20940 A good testcase for this is mb-inline.exp.
20942 LOWPC is the lowest address in CU (or 0 if not known).
20944 Boolean DECODE_MAPPING specifies we need to fully decode .debug_line
20945 for its PC<->lines mapping information. Otherwise only the filename
20946 table is read in. */
20949 dwarf_decode_lines (struct line_header *lh, const char *comp_dir,
20950 struct dwarf2_cu *cu, struct partial_symtab *pst,
20951 CORE_ADDR lowpc, int decode_mapping)
20953 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
20954 const int decode_for_pst_p = (pst != NULL);
20956 if (decode_mapping)
20957 dwarf_decode_lines_1 (lh, cu, decode_for_pst_p, lowpc);
20959 if (decode_for_pst_p)
20963 /* Now that we're done scanning the Line Header Program, we can
20964 create the psymtab of each included file. */
20965 for (file_index = 0; file_index < lh->file_names.size (); file_index++)
20966 if (lh->file_names[file_index].included_p == 1)
20968 gdb::unique_xmalloc_ptr<char> name_holder;
20969 const char *include_name =
20970 psymtab_include_file_name (lh, file_index, pst, comp_dir,
20972 if (include_name != NULL)
20973 dwarf2_create_include_psymtab (include_name, pst, objfile);
20978 /* Make sure a symtab is created for every file, even files
20979 which contain only variables (i.e. no code with associated
20981 struct compunit_symtab *cust = buildsym_compunit_symtab ();
20984 for (i = 0; i < lh->file_names.size (); i++)
20986 file_entry &fe = lh->file_names[i];
20988 dwarf2_start_subfile (fe.name, fe.include_dir (lh));
20990 if (current_subfile->symtab == NULL)
20992 current_subfile->symtab
20993 = allocate_symtab (cust, current_subfile->name);
20995 fe.symtab = current_subfile->symtab;
21000 /* Start a subfile for DWARF. FILENAME is the name of the file and
21001 DIRNAME the name of the source directory which contains FILENAME
21002 or NULL if not known.
21003 This routine tries to keep line numbers from identical absolute and
21004 relative file names in a common subfile.
21006 Using the `list' example from the GDB testsuite, which resides in
21007 /srcdir and compiling it with Irix6.2 cc in /compdir using a filename
21008 of /srcdir/list0.c yields the following debugging information for list0.c:
21010 DW_AT_name: /srcdir/list0.c
21011 DW_AT_comp_dir: /compdir
21012 files.files[0].name: list0.h
21013 files.files[0].dir: /srcdir
21014 files.files[1].name: list0.c
21015 files.files[1].dir: /srcdir
21017 The line number information for list0.c has to end up in a single
21018 subfile, so that `break /srcdir/list0.c:1' works as expected.
21019 start_subfile will ensure that this happens provided that we pass the
21020 concatenation of files.files[1].dir and files.files[1].name as the
21024 dwarf2_start_subfile (const char *filename, 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 start_subfile (filename);
21047 /* Start a symtab for DWARF.
21048 NAME, COMP_DIR, LOW_PC are passed to start_symtab. */
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 struct compunit_symtab *cust
21055 = start_symtab (cu->per_cu->dwarf2_per_objfile->objfile, name, comp_dir,
21056 low_pc, cu->language);
21058 record_debugformat ("DWARF 2");
21059 record_producer (cu->producer);
21061 /* We assume that we're processing GCC output. */
21062 processing_gcc_compilation = 2;
21064 cu->processing_has_namespace_info = 0;
21070 var_decode_location (struct attribute *attr, struct symbol *sym,
21071 struct dwarf2_cu *cu)
21073 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
21074 struct comp_unit_head *cu_header = &cu->header;
21076 /* NOTE drow/2003-01-30: There used to be a comment and some special
21077 code here to turn a symbol with DW_AT_external and a
21078 SYMBOL_VALUE_ADDRESS of 0 into a LOC_UNRESOLVED symbol. This was
21079 necessary for platforms (maybe Alpha, certainly PowerPC GNU/Linux
21080 with some versions of binutils) where shared libraries could have
21081 relocations against symbols in their debug information - the
21082 minimal symbol would have the right address, but the debug info
21083 would not. It's no longer necessary, because we will explicitly
21084 apply relocations when we read in the debug information now. */
21086 /* A DW_AT_location attribute with no contents indicates that a
21087 variable has been optimized away. */
21088 if (attr_form_is_block (attr) && DW_BLOCK (attr)->size == 0)
21090 SYMBOL_ACLASS_INDEX (sym) = LOC_OPTIMIZED_OUT;
21094 /* Handle one degenerate form of location expression specially, to
21095 preserve GDB's previous behavior when section offsets are
21096 specified. If this is just a DW_OP_addr or DW_OP_GNU_addr_index
21097 then mark this symbol as LOC_STATIC. */
21099 if (attr_form_is_block (attr)
21100 && ((DW_BLOCK (attr)->data[0] == DW_OP_addr
21101 && DW_BLOCK (attr)->size == 1 + cu_header->addr_size)
21102 || (DW_BLOCK (attr)->data[0] == DW_OP_GNU_addr_index
21103 && (DW_BLOCK (attr)->size
21104 == 1 + leb128_size (&DW_BLOCK (attr)->data[1])))))
21106 unsigned int dummy;
21108 if (DW_BLOCK (attr)->data[0] == DW_OP_addr)
21109 SYMBOL_VALUE_ADDRESS (sym) =
21110 read_address (objfile->obfd, DW_BLOCK (attr)->data + 1, cu, &dummy);
21112 SYMBOL_VALUE_ADDRESS (sym) =
21113 read_addr_index_from_leb128 (cu, DW_BLOCK (attr)->data + 1, &dummy);
21114 SYMBOL_ACLASS_INDEX (sym) = LOC_STATIC;
21115 fixup_symbol_section (sym, objfile);
21116 SYMBOL_VALUE_ADDRESS (sym) += ANOFFSET (objfile->section_offsets,
21117 SYMBOL_SECTION (sym));
21121 /* NOTE drow/2002-01-30: It might be worthwhile to have a static
21122 expression evaluator, and use LOC_COMPUTED only when necessary
21123 (i.e. when the value of a register or memory location is
21124 referenced, or a thread-local block, etc.). Then again, it might
21125 not be worthwhile. I'm assuming that it isn't unless performance
21126 or memory numbers show me otherwise. */
21128 dwarf2_symbol_mark_computed (attr, sym, cu, 0);
21130 if (SYMBOL_COMPUTED_OPS (sym)->location_has_loclist)
21131 cu->has_loclist = 1;
21134 /* Given a pointer to a DWARF information entry, figure out if we need
21135 to make a symbol table entry for it, and if so, create a new entry
21136 and return a pointer to it.
21137 If TYPE is NULL, determine symbol type from the die, otherwise
21138 used the passed type.
21139 If SPACE is not NULL, use it to hold the new symbol. If it is
21140 NULL, allocate a new symbol on the objfile's obstack. */
21142 static struct symbol *
21143 new_symbol (struct die_info *die, struct type *type, struct dwarf2_cu *cu,
21144 struct symbol *space)
21146 struct dwarf2_per_objfile *dwarf2_per_objfile
21147 = cu->per_cu->dwarf2_per_objfile;
21148 struct objfile *objfile = dwarf2_per_objfile->objfile;
21149 struct gdbarch *gdbarch = get_objfile_arch (objfile);
21150 struct symbol *sym = NULL;
21152 struct attribute *attr = NULL;
21153 struct attribute *attr2 = NULL;
21154 CORE_ADDR baseaddr;
21155 struct pending **list_to_add = NULL;
21157 int inlined_func = (die->tag == DW_TAG_inlined_subroutine);
21159 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
21161 name = dwarf2_name (die, cu);
21164 const char *linkagename;
21165 int suppress_add = 0;
21170 sym = allocate_symbol (objfile);
21171 OBJSTAT (objfile, n_syms++);
21173 /* Cache this symbol's name and the name's demangled form (if any). */
21174 SYMBOL_SET_LANGUAGE (sym, cu->language, &objfile->objfile_obstack);
21175 linkagename = dwarf2_physname (name, die, cu);
21176 SYMBOL_SET_NAMES (sym, linkagename, strlen (linkagename), 0, objfile);
21178 /* Fortran does not have mangling standard and the mangling does differ
21179 between gfortran, iFort etc. */
21180 if (cu->language == language_fortran
21181 && symbol_get_demangled_name (&(sym->ginfo)) == NULL)
21182 symbol_set_demangled_name (&(sym->ginfo),
21183 dwarf2_full_name (name, die, cu),
21186 /* Default assumptions.
21187 Use the passed type or decode it from the die. */
21188 SYMBOL_DOMAIN (sym) = VAR_DOMAIN;
21189 SYMBOL_ACLASS_INDEX (sym) = LOC_OPTIMIZED_OUT;
21191 SYMBOL_TYPE (sym) = type;
21193 SYMBOL_TYPE (sym) = die_type (die, cu);
21194 attr = dwarf2_attr (die,
21195 inlined_func ? DW_AT_call_line : DW_AT_decl_line,
21199 SYMBOL_LINE (sym) = DW_UNSND (attr);
21202 attr = dwarf2_attr (die,
21203 inlined_func ? DW_AT_call_file : DW_AT_decl_file,
21207 file_name_index file_index = (file_name_index) DW_UNSND (attr);
21208 struct file_entry *fe;
21210 if (cu->line_header != NULL)
21211 fe = cu->line_header->file_name_at (file_index);
21216 complaint (_("file index out of range"));
21218 symbol_set_symtab (sym, fe->symtab);
21224 attr = dwarf2_attr (die, DW_AT_low_pc, cu);
21229 addr = attr_value_as_address (attr);
21230 addr = gdbarch_adjust_dwarf2_addr (gdbarch, addr + baseaddr);
21231 SYMBOL_VALUE_ADDRESS (sym) = addr;
21233 SYMBOL_TYPE (sym) = objfile_type (objfile)->builtin_core_addr;
21234 SYMBOL_DOMAIN (sym) = LABEL_DOMAIN;
21235 SYMBOL_ACLASS_INDEX (sym) = LOC_LABEL;
21236 dw2_add_symbol_to_list (sym, cu->list_in_scope);
21238 case DW_TAG_subprogram:
21239 /* SYMBOL_BLOCK_VALUE (sym) will be filled in later by
21241 SYMBOL_ACLASS_INDEX (sym) = LOC_BLOCK;
21242 attr2 = dwarf2_attr (die, DW_AT_external, cu);
21243 if ((attr2 && (DW_UNSND (attr2) != 0))
21244 || cu->language == language_ada)
21246 /* Subprograms marked external are stored as a global symbol.
21247 Ada subprograms, whether marked external or not, are always
21248 stored as a global symbol, because we want to be able to
21249 access them globally. For instance, we want to be able
21250 to break on a nested subprogram without having to
21251 specify the context. */
21252 list_to_add = &global_symbols;
21256 list_to_add = cu->list_in_scope;
21259 case DW_TAG_inlined_subroutine:
21260 /* SYMBOL_BLOCK_VALUE (sym) will be filled in later by
21262 SYMBOL_ACLASS_INDEX (sym) = LOC_BLOCK;
21263 SYMBOL_INLINED (sym) = 1;
21264 list_to_add = cu->list_in_scope;
21266 case DW_TAG_template_value_param:
21268 /* Fall through. */
21269 case DW_TAG_constant:
21270 case DW_TAG_variable:
21271 case DW_TAG_member:
21272 /* Compilation with minimal debug info may result in
21273 variables with missing type entries. Change the
21274 misleading `void' type to something sensible. */
21275 if (TYPE_CODE (SYMBOL_TYPE (sym)) == TYPE_CODE_VOID)
21276 SYMBOL_TYPE (sym) = objfile_type (objfile)->builtin_int;
21278 attr = dwarf2_attr (die, DW_AT_const_value, cu);
21279 /* In the case of DW_TAG_member, we should only be called for
21280 static const members. */
21281 if (die->tag == DW_TAG_member)
21283 /* dwarf2_add_field uses die_is_declaration,
21284 so we do the same. */
21285 gdb_assert (die_is_declaration (die, cu));
21290 dwarf2_const_value (attr, sym, cu);
21291 attr2 = dwarf2_attr (die, DW_AT_external, cu);
21294 if (attr2 && (DW_UNSND (attr2) != 0))
21295 list_to_add = &global_symbols;
21297 list_to_add = cu->list_in_scope;
21301 attr = dwarf2_attr (die, DW_AT_location, cu);
21304 var_decode_location (attr, sym, cu);
21305 attr2 = dwarf2_attr (die, DW_AT_external, cu);
21307 /* Fortran explicitly imports any global symbols to the local
21308 scope by DW_TAG_common_block. */
21309 if (cu->language == language_fortran && die->parent
21310 && die->parent->tag == DW_TAG_common_block)
21313 if (SYMBOL_CLASS (sym) == LOC_STATIC
21314 && SYMBOL_VALUE_ADDRESS (sym) == 0
21315 && !dwarf2_per_objfile->has_section_at_zero)
21317 /* When a static variable is eliminated by the linker,
21318 the corresponding debug information is not stripped
21319 out, but the variable address is set to null;
21320 do not add such variables into symbol table. */
21322 else if (attr2 && (DW_UNSND (attr2) != 0))
21324 /* Workaround gfortran PR debug/40040 - it uses
21325 DW_AT_location for variables in -fPIC libraries which may
21326 get overriden by other libraries/executable and get
21327 a different address. Resolve it by the minimal symbol
21328 which may come from inferior's executable using copy
21329 relocation. Make this workaround only for gfortran as for
21330 other compilers GDB cannot guess the minimal symbol
21331 Fortran mangling kind. */
21332 if (cu->language == language_fortran && die->parent
21333 && die->parent->tag == DW_TAG_module
21335 && startswith (cu->producer, "GNU Fortran"))
21336 SYMBOL_ACLASS_INDEX (sym) = LOC_UNRESOLVED;
21338 /* A variable with DW_AT_external is never static,
21339 but it may be block-scoped. */
21340 list_to_add = (cu->list_in_scope == &file_symbols
21341 ? &global_symbols : cu->list_in_scope);
21344 list_to_add = cu->list_in_scope;
21348 /* We do not know the address of this symbol.
21349 If it is an external symbol and we have type information
21350 for it, enter the symbol as a LOC_UNRESOLVED symbol.
21351 The address of the variable will then be determined from
21352 the minimal symbol table whenever the variable is
21354 attr2 = dwarf2_attr (die, DW_AT_external, cu);
21356 /* Fortran explicitly imports any global symbols to the local
21357 scope by DW_TAG_common_block. */
21358 if (cu->language == language_fortran && die->parent
21359 && die->parent->tag == DW_TAG_common_block)
21361 /* SYMBOL_CLASS doesn't matter here because
21362 read_common_block is going to reset it. */
21364 list_to_add = cu->list_in_scope;
21366 else if (attr2 && (DW_UNSND (attr2) != 0)
21367 && dwarf2_attr (die, DW_AT_type, cu) != NULL)
21369 /* A variable with DW_AT_external is never static, but it
21370 may be block-scoped. */
21371 list_to_add = (cu->list_in_scope == &file_symbols
21372 ? &global_symbols : cu->list_in_scope);
21374 SYMBOL_ACLASS_INDEX (sym) = LOC_UNRESOLVED;
21376 else if (!die_is_declaration (die, cu))
21378 /* Use the default LOC_OPTIMIZED_OUT class. */
21379 gdb_assert (SYMBOL_CLASS (sym) == LOC_OPTIMIZED_OUT);
21381 list_to_add = cu->list_in_scope;
21385 case DW_TAG_formal_parameter:
21386 /* If we are inside a function, mark this as an argument. If
21387 not, we might be looking at an argument to an inlined function
21388 when we do not have enough information to show inlined frames;
21389 pretend it's a local variable in that case so that the user can
21391 if (context_stack_depth > 0
21392 && context_stack[context_stack_depth - 1].name != NULL)
21393 SYMBOL_IS_ARGUMENT (sym) = 1;
21394 attr = dwarf2_attr (die, DW_AT_location, cu);
21397 var_decode_location (attr, sym, cu);
21399 attr = dwarf2_attr (die, DW_AT_const_value, cu);
21402 dwarf2_const_value (attr, sym, cu);
21405 list_to_add = cu->list_in_scope;
21407 case DW_TAG_unspecified_parameters:
21408 /* From varargs functions; gdb doesn't seem to have any
21409 interest in this information, so just ignore it for now.
21412 case DW_TAG_template_type_param:
21414 /* Fall through. */
21415 case DW_TAG_class_type:
21416 case DW_TAG_interface_type:
21417 case DW_TAG_structure_type:
21418 case DW_TAG_union_type:
21419 case DW_TAG_set_type:
21420 case DW_TAG_enumeration_type:
21421 SYMBOL_ACLASS_INDEX (sym) = LOC_TYPEDEF;
21422 SYMBOL_DOMAIN (sym) = STRUCT_DOMAIN;
21425 /* NOTE: carlton/2003-11-10: C++ class symbols shouldn't
21426 really ever be static objects: otherwise, if you try
21427 to, say, break of a class's method and you're in a file
21428 which doesn't mention that class, it won't work unless
21429 the check for all static symbols in lookup_symbol_aux
21430 saves you. See the OtherFileClass tests in
21431 gdb.c++/namespace.exp. */
21435 list_to_add = (cu->list_in_scope == &file_symbols
21436 && cu->language == language_cplus
21437 ? &global_symbols : cu->list_in_scope);
21439 /* The semantics of C++ state that "struct foo {
21440 ... }" also defines a typedef for "foo". */
21441 if (cu->language == language_cplus
21442 || cu->language == language_ada
21443 || cu->language == language_d
21444 || cu->language == language_rust)
21446 /* The symbol's name is already allocated along
21447 with this objfile, so we don't need to
21448 duplicate it for the type. */
21449 if (TYPE_NAME (SYMBOL_TYPE (sym)) == 0)
21450 TYPE_NAME (SYMBOL_TYPE (sym)) = SYMBOL_SEARCH_NAME (sym);
21455 case DW_TAG_typedef:
21456 SYMBOL_ACLASS_INDEX (sym) = LOC_TYPEDEF;
21457 SYMBOL_DOMAIN (sym) = VAR_DOMAIN;
21458 list_to_add = cu->list_in_scope;
21460 case DW_TAG_base_type:
21461 case DW_TAG_subrange_type:
21462 SYMBOL_ACLASS_INDEX (sym) = LOC_TYPEDEF;
21463 SYMBOL_DOMAIN (sym) = VAR_DOMAIN;
21464 list_to_add = cu->list_in_scope;
21466 case DW_TAG_enumerator:
21467 attr = dwarf2_attr (die, DW_AT_const_value, cu);
21470 dwarf2_const_value (attr, sym, cu);
21473 /* NOTE: carlton/2003-11-10: See comment above in the
21474 DW_TAG_class_type, etc. block. */
21476 list_to_add = (cu->list_in_scope == &file_symbols
21477 && cu->language == language_cplus
21478 ? &global_symbols : cu->list_in_scope);
21481 case DW_TAG_imported_declaration:
21482 case DW_TAG_namespace:
21483 SYMBOL_ACLASS_INDEX (sym) = LOC_TYPEDEF;
21484 list_to_add = &global_symbols;
21486 case DW_TAG_module:
21487 SYMBOL_ACLASS_INDEX (sym) = LOC_TYPEDEF;
21488 SYMBOL_DOMAIN (sym) = MODULE_DOMAIN;
21489 list_to_add = &global_symbols;
21491 case DW_TAG_common_block:
21492 SYMBOL_ACLASS_INDEX (sym) = LOC_COMMON_BLOCK;
21493 SYMBOL_DOMAIN (sym) = COMMON_BLOCK_DOMAIN;
21494 dw2_add_symbol_to_list (sym, cu->list_in_scope);
21497 /* Not a tag we recognize. Hopefully we aren't processing
21498 trash data, but since we must specifically ignore things
21499 we don't recognize, there is nothing else we should do at
21501 complaint (_("unsupported tag: '%s'"),
21502 dwarf_tag_name (die->tag));
21508 sym->hash_next = objfile->template_symbols;
21509 objfile->template_symbols = sym;
21510 list_to_add = NULL;
21513 if (list_to_add != NULL)
21514 dw2_add_symbol_to_list (sym, list_to_add);
21516 /* For the benefit of old versions of GCC, check for anonymous
21517 namespaces based on the demangled name. */
21518 if (!cu->processing_has_namespace_info
21519 && cu->language == language_cplus)
21520 cp_scan_for_anonymous_namespaces (sym, objfile);
21525 /* Given an attr with a DW_FORM_dataN value in host byte order,
21526 zero-extend it as appropriate for the symbol's type. The DWARF
21527 standard (v4) is not entirely clear about the meaning of using
21528 DW_FORM_dataN for a constant with a signed type, where the type is
21529 wider than the data. The conclusion of a discussion on the DWARF
21530 list was that this is unspecified. We choose to always zero-extend
21531 because that is the interpretation long in use by GCC. */
21534 dwarf2_const_value_data (const struct attribute *attr, struct obstack *obstack,
21535 struct dwarf2_cu *cu, LONGEST *value, int bits)
21537 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
21538 enum bfd_endian byte_order = bfd_big_endian (objfile->obfd) ?
21539 BFD_ENDIAN_BIG : BFD_ENDIAN_LITTLE;
21540 LONGEST l = DW_UNSND (attr);
21542 if (bits < sizeof (*value) * 8)
21544 l &= ((LONGEST) 1 << bits) - 1;
21547 else if (bits == sizeof (*value) * 8)
21551 gdb_byte *bytes = (gdb_byte *) obstack_alloc (obstack, bits / 8);
21552 store_unsigned_integer (bytes, bits / 8, byte_order, l);
21559 /* Read a constant value from an attribute. Either set *VALUE, or if
21560 the value does not fit in *VALUE, set *BYTES - either already
21561 allocated on the objfile obstack, or newly allocated on OBSTACK,
21562 or, set *BATON, if we translated the constant to a location
21566 dwarf2_const_value_attr (const struct attribute *attr, struct type *type,
21567 const char *name, struct obstack *obstack,
21568 struct dwarf2_cu *cu,
21569 LONGEST *value, const gdb_byte **bytes,
21570 struct dwarf2_locexpr_baton **baton)
21572 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
21573 struct comp_unit_head *cu_header = &cu->header;
21574 struct dwarf_block *blk;
21575 enum bfd_endian byte_order = (bfd_big_endian (objfile->obfd) ?
21576 BFD_ENDIAN_BIG : BFD_ENDIAN_LITTLE);
21582 switch (attr->form)
21585 case DW_FORM_GNU_addr_index:
21589 if (TYPE_LENGTH (type) != cu_header->addr_size)
21590 dwarf2_const_value_length_mismatch_complaint (name,
21591 cu_header->addr_size,
21592 TYPE_LENGTH (type));
21593 /* Symbols of this form are reasonably rare, so we just
21594 piggyback on the existing location code rather than writing
21595 a new implementation of symbol_computed_ops. */
21596 *baton = XOBNEW (obstack, struct dwarf2_locexpr_baton);
21597 (*baton)->per_cu = cu->per_cu;
21598 gdb_assert ((*baton)->per_cu);
21600 (*baton)->size = 2 + cu_header->addr_size;
21601 data = (gdb_byte *) obstack_alloc (obstack, (*baton)->size);
21602 (*baton)->data = data;
21604 data[0] = DW_OP_addr;
21605 store_unsigned_integer (&data[1], cu_header->addr_size,
21606 byte_order, DW_ADDR (attr));
21607 data[cu_header->addr_size + 1] = DW_OP_stack_value;
21610 case DW_FORM_string:
21612 case DW_FORM_GNU_str_index:
21613 case DW_FORM_GNU_strp_alt:
21614 /* DW_STRING is already allocated on the objfile obstack, point
21616 *bytes = (const gdb_byte *) DW_STRING (attr);
21618 case DW_FORM_block1:
21619 case DW_FORM_block2:
21620 case DW_FORM_block4:
21621 case DW_FORM_block:
21622 case DW_FORM_exprloc:
21623 case DW_FORM_data16:
21624 blk = DW_BLOCK (attr);
21625 if (TYPE_LENGTH (type) != blk->size)
21626 dwarf2_const_value_length_mismatch_complaint (name, blk->size,
21627 TYPE_LENGTH (type));
21628 *bytes = blk->data;
21631 /* The DW_AT_const_value attributes are supposed to carry the
21632 symbol's value "represented as it would be on the target
21633 architecture." By the time we get here, it's already been
21634 converted to host endianness, so we just need to sign- or
21635 zero-extend it as appropriate. */
21636 case DW_FORM_data1:
21637 *bytes = dwarf2_const_value_data (attr, obstack, cu, value, 8);
21639 case DW_FORM_data2:
21640 *bytes = dwarf2_const_value_data (attr, obstack, cu, value, 16);
21642 case DW_FORM_data4:
21643 *bytes = dwarf2_const_value_data (attr, obstack, cu, value, 32);
21645 case DW_FORM_data8:
21646 *bytes = dwarf2_const_value_data (attr, obstack, cu, value, 64);
21649 case DW_FORM_sdata:
21650 case DW_FORM_implicit_const:
21651 *value = DW_SND (attr);
21654 case DW_FORM_udata:
21655 *value = DW_UNSND (attr);
21659 complaint (_("unsupported const value attribute form: '%s'"),
21660 dwarf_form_name (attr->form));
21667 /* Copy constant value from an attribute to a symbol. */
21670 dwarf2_const_value (const struct attribute *attr, struct symbol *sym,
21671 struct dwarf2_cu *cu)
21673 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
21675 const gdb_byte *bytes;
21676 struct dwarf2_locexpr_baton *baton;
21678 dwarf2_const_value_attr (attr, SYMBOL_TYPE (sym),
21679 SYMBOL_PRINT_NAME (sym),
21680 &objfile->objfile_obstack, cu,
21681 &value, &bytes, &baton);
21685 SYMBOL_LOCATION_BATON (sym) = baton;
21686 SYMBOL_ACLASS_INDEX (sym) = dwarf2_locexpr_index;
21688 else if (bytes != NULL)
21690 SYMBOL_VALUE_BYTES (sym) = bytes;
21691 SYMBOL_ACLASS_INDEX (sym) = LOC_CONST_BYTES;
21695 SYMBOL_VALUE (sym) = value;
21696 SYMBOL_ACLASS_INDEX (sym) = LOC_CONST;
21700 /* Return the type of the die in question using its DW_AT_type attribute. */
21702 static struct type *
21703 die_type (struct die_info *die, struct dwarf2_cu *cu)
21705 struct attribute *type_attr;
21707 type_attr = dwarf2_attr (die, DW_AT_type, cu);
21710 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
21711 /* A missing DW_AT_type represents a void type. */
21712 return objfile_type (objfile)->builtin_void;
21715 return lookup_die_type (die, type_attr, cu);
21718 /* True iff CU's producer generates GNAT Ada auxiliary information
21719 that allows to find parallel types through that information instead
21720 of having to do expensive parallel lookups by type name. */
21723 need_gnat_info (struct dwarf2_cu *cu)
21725 /* Assume that the Ada compiler was GNAT, which always produces
21726 the auxiliary information. */
21727 return (cu->language == language_ada);
21730 /* Return the auxiliary type of the die in question using its
21731 DW_AT_GNAT_descriptive_type attribute. Returns NULL if the
21732 attribute is not present. */
21734 static struct type *
21735 die_descriptive_type (struct die_info *die, struct dwarf2_cu *cu)
21737 struct attribute *type_attr;
21739 type_attr = dwarf2_attr (die, DW_AT_GNAT_descriptive_type, cu);
21743 return lookup_die_type (die, type_attr, cu);
21746 /* If DIE has a descriptive_type attribute, then set the TYPE's
21747 descriptive type accordingly. */
21750 set_descriptive_type (struct type *type, struct die_info *die,
21751 struct dwarf2_cu *cu)
21753 struct type *descriptive_type = die_descriptive_type (die, cu);
21755 if (descriptive_type)
21757 ALLOCATE_GNAT_AUX_TYPE (type);
21758 TYPE_DESCRIPTIVE_TYPE (type) = descriptive_type;
21762 /* Return the containing type of the die in question using its
21763 DW_AT_containing_type attribute. */
21765 static struct type *
21766 die_containing_type (struct die_info *die, struct dwarf2_cu *cu)
21768 struct attribute *type_attr;
21769 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
21771 type_attr = dwarf2_attr (die, DW_AT_containing_type, cu);
21773 error (_("Dwarf Error: Problem turning containing type into gdb type "
21774 "[in module %s]"), objfile_name (objfile));
21776 return lookup_die_type (die, type_attr, cu);
21779 /* Return an error marker type to use for the ill formed type in DIE/CU. */
21781 static struct type *
21782 build_error_marker_type (struct dwarf2_cu *cu, struct die_info *die)
21784 struct dwarf2_per_objfile *dwarf2_per_objfile
21785 = cu->per_cu->dwarf2_per_objfile;
21786 struct objfile *objfile = dwarf2_per_objfile->objfile;
21787 char *message, *saved;
21789 message = xstrprintf (_("<unknown type in %s, CU %s, DIE %s>"),
21790 objfile_name (objfile),
21791 sect_offset_str (cu->header.sect_off),
21792 sect_offset_str (die->sect_off));
21793 saved = (char *) obstack_copy0 (&objfile->objfile_obstack,
21794 message, strlen (message));
21797 return init_type (objfile, TYPE_CODE_ERROR, 0, saved);
21800 /* Look up the type of DIE in CU using its type attribute ATTR.
21801 ATTR must be one of: DW_AT_type, DW_AT_GNAT_descriptive_type,
21802 DW_AT_containing_type.
21803 If there is no type substitute an error marker. */
21805 static struct type *
21806 lookup_die_type (struct die_info *die, const struct attribute *attr,
21807 struct dwarf2_cu *cu)
21809 struct dwarf2_per_objfile *dwarf2_per_objfile
21810 = cu->per_cu->dwarf2_per_objfile;
21811 struct objfile *objfile = dwarf2_per_objfile->objfile;
21812 struct type *this_type;
21814 gdb_assert (attr->name == DW_AT_type
21815 || attr->name == DW_AT_GNAT_descriptive_type
21816 || attr->name == DW_AT_containing_type);
21818 /* First see if we have it cached. */
21820 if (attr->form == DW_FORM_GNU_ref_alt)
21822 struct dwarf2_per_cu_data *per_cu;
21823 sect_offset sect_off = dwarf2_get_ref_die_offset (attr);
21825 per_cu = dwarf2_find_containing_comp_unit (sect_off, 1,
21826 dwarf2_per_objfile);
21827 this_type = get_die_type_at_offset (sect_off, per_cu);
21829 else if (attr_form_is_ref (attr))
21831 sect_offset sect_off = dwarf2_get_ref_die_offset (attr);
21833 this_type = get_die_type_at_offset (sect_off, cu->per_cu);
21835 else if (attr->form == DW_FORM_ref_sig8)
21837 ULONGEST signature = DW_SIGNATURE (attr);
21839 return get_signatured_type (die, signature, cu);
21843 complaint (_("Dwarf Error: Bad type attribute %s in DIE"
21844 " at %s [in module %s]"),
21845 dwarf_attr_name (attr->name), sect_offset_str (die->sect_off),
21846 objfile_name (objfile));
21847 return build_error_marker_type (cu, die);
21850 /* If not cached we need to read it in. */
21852 if (this_type == NULL)
21854 struct die_info *type_die = NULL;
21855 struct dwarf2_cu *type_cu = cu;
21857 if (attr_form_is_ref (attr))
21858 type_die = follow_die_ref (die, attr, &type_cu);
21859 if (type_die == NULL)
21860 return build_error_marker_type (cu, die);
21861 /* If we find the type now, it's probably because the type came
21862 from an inter-CU reference and the type's CU got expanded before
21864 this_type = read_type_die (type_die, type_cu);
21867 /* If we still don't have a type use an error marker. */
21869 if (this_type == NULL)
21870 return build_error_marker_type (cu, die);
21875 /* Return the type in DIE, CU.
21876 Returns NULL for invalid types.
21878 This first does a lookup in die_type_hash,
21879 and only reads the die in if necessary.
21881 NOTE: This can be called when reading in partial or full symbols. */
21883 static struct type *
21884 read_type_die (struct die_info *die, struct dwarf2_cu *cu)
21886 struct type *this_type;
21888 this_type = get_die_type (die, cu);
21892 return read_type_die_1 (die, cu);
21895 /* Read the type in DIE, CU.
21896 Returns NULL for invalid types. */
21898 static struct type *
21899 read_type_die_1 (struct die_info *die, struct dwarf2_cu *cu)
21901 struct type *this_type = NULL;
21905 case DW_TAG_class_type:
21906 case DW_TAG_interface_type:
21907 case DW_TAG_structure_type:
21908 case DW_TAG_union_type:
21909 this_type = read_structure_type (die, cu);
21911 case DW_TAG_enumeration_type:
21912 this_type = read_enumeration_type (die, cu);
21914 case DW_TAG_subprogram:
21915 case DW_TAG_subroutine_type:
21916 case DW_TAG_inlined_subroutine:
21917 this_type = read_subroutine_type (die, cu);
21919 case DW_TAG_array_type:
21920 this_type = read_array_type (die, cu);
21922 case DW_TAG_set_type:
21923 this_type = read_set_type (die, cu);
21925 case DW_TAG_pointer_type:
21926 this_type = read_tag_pointer_type (die, cu);
21928 case DW_TAG_ptr_to_member_type:
21929 this_type = read_tag_ptr_to_member_type (die, cu);
21931 case DW_TAG_reference_type:
21932 this_type = read_tag_reference_type (die, cu, TYPE_CODE_REF);
21934 case DW_TAG_rvalue_reference_type:
21935 this_type = read_tag_reference_type (die, cu, TYPE_CODE_RVALUE_REF);
21937 case DW_TAG_const_type:
21938 this_type = read_tag_const_type (die, cu);
21940 case DW_TAG_volatile_type:
21941 this_type = read_tag_volatile_type (die, cu);
21943 case DW_TAG_restrict_type:
21944 this_type = read_tag_restrict_type (die, cu);
21946 case DW_TAG_string_type:
21947 this_type = read_tag_string_type (die, cu);
21949 case DW_TAG_typedef:
21950 this_type = read_typedef (die, cu);
21952 case DW_TAG_subrange_type:
21953 this_type = read_subrange_type (die, cu);
21955 case DW_TAG_base_type:
21956 this_type = read_base_type (die, cu);
21958 case DW_TAG_unspecified_type:
21959 this_type = read_unspecified_type (die, cu);
21961 case DW_TAG_namespace:
21962 this_type = read_namespace_type (die, cu);
21964 case DW_TAG_module:
21965 this_type = read_module_type (die, cu);
21967 case DW_TAG_atomic_type:
21968 this_type = read_tag_atomic_type (die, cu);
21971 complaint (_("unexpected tag in read_type_die: '%s'"),
21972 dwarf_tag_name (die->tag));
21979 /* See if we can figure out if the class lives in a namespace. We do
21980 this by looking for a member function; its demangled name will
21981 contain namespace info, if there is any.
21982 Return the computed name or NULL.
21983 Space for the result is allocated on the objfile's obstack.
21984 This is the full-die version of guess_partial_die_structure_name.
21985 In this case we know DIE has no useful parent. */
21988 guess_full_die_structure_name (struct die_info *die, struct dwarf2_cu *cu)
21990 struct die_info *spec_die;
21991 struct dwarf2_cu *spec_cu;
21992 struct die_info *child;
21993 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
21996 spec_die = die_specification (die, &spec_cu);
21997 if (spec_die != NULL)
22003 for (child = die->child;
22005 child = child->sibling)
22007 if (child->tag == DW_TAG_subprogram)
22009 const char *linkage_name = dw2_linkage_name (child, cu);
22011 if (linkage_name != NULL)
22014 = language_class_name_from_physname (cu->language_defn,
22018 if (actual_name != NULL)
22020 const char *die_name = dwarf2_name (die, cu);
22022 if (die_name != NULL
22023 && strcmp (die_name, actual_name) != 0)
22025 /* Strip off the class name from the full name.
22026 We want the prefix. */
22027 int die_name_len = strlen (die_name);
22028 int actual_name_len = strlen (actual_name);
22030 /* Test for '::' as a sanity check. */
22031 if (actual_name_len > die_name_len + 2
22032 && actual_name[actual_name_len
22033 - die_name_len - 1] == ':')
22034 name = (char *) obstack_copy0 (
22035 &objfile->per_bfd->storage_obstack,
22036 actual_name, actual_name_len - die_name_len - 2);
22039 xfree (actual_name);
22048 /* GCC might emit a nameless typedef that has a linkage name. Determine the
22049 prefix part in such case. See
22050 http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47510. */
22052 static const char *
22053 anonymous_struct_prefix (struct die_info *die, struct dwarf2_cu *cu)
22055 struct attribute *attr;
22058 if (die->tag != DW_TAG_class_type && die->tag != DW_TAG_interface_type
22059 && die->tag != DW_TAG_structure_type && die->tag != DW_TAG_union_type)
22062 if (dwarf2_string_attr (die, DW_AT_name, cu) != NULL)
22065 attr = dw2_linkage_name_attr (die, cu);
22066 if (attr == NULL || DW_STRING (attr) == NULL)
22069 /* dwarf2_name had to be already called. */
22070 gdb_assert (DW_STRING_IS_CANONICAL (attr));
22072 /* Strip the base name, keep any leading namespaces/classes. */
22073 base = strrchr (DW_STRING (attr), ':');
22074 if (base == NULL || base == DW_STRING (attr) || base[-1] != ':')
22077 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
22078 return (char *) obstack_copy0 (&objfile->per_bfd->storage_obstack,
22080 &base[-1] - DW_STRING (attr));
22083 /* Return the name of the namespace/class that DIE is defined within,
22084 or "" if we can't tell. The caller should not xfree the result.
22086 For example, if we're within the method foo() in the following
22096 then determine_prefix on foo's die will return "N::C". */
22098 static const char *
22099 determine_prefix (struct die_info *die, struct dwarf2_cu *cu)
22101 struct dwarf2_per_objfile *dwarf2_per_objfile
22102 = cu->per_cu->dwarf2_per_objfile;
22103 struct die_info *parent, *spec_die;
22104 struct dwarf2_cu *spec_cu;
22105 struct type *parent_type;
22106 const char *retval;
22108 if (cu->language != language_cplus
22109 && cu->language != language_fortran && cu->language != language_d
22110 && cu->language != language_rust)
22113 retval = anonymous_struct_prefix (die, cu);
22117 /* We have to be careful in the presence of DW_AT_specification.
22118 For example, with GCC 3.4, given the code
22122 // Definition of N::foo.
22126 then we'll have a tree of DIEs like this:
22128 1: DW_TAG_compile_unit
22129 2: DW_TAG_namespace // N
22130 3: DW_TAG_subprogram // declaration of N::foo
22131 4: DW_TAG_subprogram // definition of N::foo
22132 DW_AT_specification // refers to die #3
22134 Thus, when processing die #4, we have to pretend that we're in
22135 the context of its DW_AT_specification, namely the contex of die
22138 spec_die = die_specification (die, &spec_cu);
22139 if (spec_die == NULL)
22140 parent = die->parent;
22143 parent = spec_die->parent;
22147 if (parent == NULL)
22149 else if (parent->building_fullname)
22152 const char *parent_name;
22154 /* It has been seen on RealView 2.2 built binaries,
22155 DW_TAG_template_type_param types actually _defined_ as
22156 children of the parent class:
22159 template class <class Enum> Class{};
22160 Class<enum E> class_e;
22162 1: DW_TAG_class_type (Class)
22163 2: DW_TAG_enumeration_type (E)
22164 3: DW_TAG_enumerator (enum1:0)
22165 3: DW_TAG_enumerator (enum2:1)
22167 2: DW_TAG_template_type_param
22168 DW_AT_type DW_FORM_ref_udata (E)
22170 Besides being broken debug info, it can put GDB into an
22171 infinite loop. Consider:
22173 When we're building the full name for Class<E>, we'll start
22174 at Class, and go look over its template type parameters,
22175 finding E. We'll then try to build the full name of E, and
22176 reach here. We're now trying to build the full name of E,
22177 and look over the parent DIE for containing scope. In the
22178 broken case, if we followed the parent DIE of E, we'd again
22179 find Class, and once again go look at its template type
22180 arguments, etc., etc. Simply don't consider such parent die
22181 as source-level parent of this die (it can't be, the language
22182 doesn't allow it), and break the loop here. */
22183 name = dwarf2_name (die, cu);
22184 parent_name = dwarf2_name (parent, cu);
22185 complaint (_("template param type '%s' defined within parent '%s'"),
22186 name ? name : "<unknown>",
22187 parent_name ? parent_name : "<unknown>");
22191 switch (parent->tag)
22193 case DW_TAG_namespace:
22194 parent_type = read_type_die (parent, cu);
22195 /* GCC 4.0 and 4.1 had a bug (PR c++/28460) where they generated bogus
22196 DW_TAG_namespace DIEs with a name of "::" for the global namespace.
22197 Work around this problem here. */
22198 if (cu->language == language_cplus
22199 && strcmp (TYPE_NAME (parent_type), "::") == 0)
22201 /* We give a name to even anonymous namespaces. */
22202 return TYPE_NAME (parent_type);
22203 case DW_TAG_class_type:
22204 case DW_TAG_interface_type:
22205 case DW_TAG_structure_type:
22206 case DW_TAG_union_type:
22207 case DW_TAG_module:
22208 parent_type = read_type_die (parent, cu);
22209 if (TYPE_NAME (parent_type) != NULL)
22210 return TYPE_NAME (parent_type);
22212 /* An anonymous structure is only allowed non-static data
22213 members; no typedefs, no member functions, et cetera.
22214 So it does not need a prefix. */
22216 case DW_TAG_compile_unit:
22217 case DW_TAG_partial_unit:
22218 /* gcc-4.5 -gdwarf-4 can drop the enclosing namespace. Cope. */
22219 if (cu->language == language_cplus
22220 && !VEC_empty (dwarf2_section_info_def, dwarf2_per_objfile->types)
22221 && die->child != NULL
22222 && (die->tag == DW_TAG_class_type
22223 || die->tag == DW_TAG_structure_type
22224 || die->tag == DW_TAG_union_type))
22226 char *name = guess_full_die_structure_name (die, cu);
22231 case DW_TAG_enumeration_type:
22232 parent_type = read_type_die (parent, cu);
22233 if (TYPE_DECLARED_CLASS (parent_type))
22235 if (TYPE_NAME (parent_type) != NULL)
22236 return TYPE_NAME (parent_type);
22239 /* Fall through. */
22241 return determine_prefix (parent, cu);
22245 /* Return a newly-allocated string formed by concatenating PREFIX and SUFFIX
22246 with appropriate separator. If PREFIX or SUFFIX is NULL or empty, then
22247 simply copy the SUFFIX or PREFIX, respectively. If OBS is non-null, perform
22248 an obconcat, otherwise allocate storage for the result. The CU argument is
22249 used to determine the language and hence, the appropriate separator. */
22251 #define MAX_SEP_LEN 7 /* strlen ("__") + strlen ("_MOD_") */
22254 typename_concat (struct obstack *obs, const char *prefix, const char *suffix,
22255 int physname, struct dwarf2_cu *cu)
22257 const char *lead = "";
22260 if (suffix == NULL || suffix[0] == '\0'
22261 || prefix == NULL || prefix[0] == '\0')
22263 else if (cu->language == language_d)
22265 /* For D, the 'main' function could be defined in any module, but it
22266 should never be prefixed. */
22267 if (strcmp (suffix, "D main") == 0)
22275 else if (cu->language == language_fortran && physname)
22277 /* This is gfortran specific mangling. Normally DW_AT_linkage_name or
22278 DW_AT_MIPS_linkage_name is preferred and used instead. */
22286 if (prefix == NULL)
22288 if (suffix == NULL)
22295 xmalloc (strlen (prefix) + MAX_SEP_LEN + strlen (suffix) + 1));
22297 strcpy (retval, lead);
22298 strcat (retval, prefix);
22299 strcat (retval, sep);
22300 strcat (retval, suffix);
22305 /* We have an obstack. */
22306 return obconcat (obs, lead, prefix, sep, suffix, (char *) NULL);
22310 /* Return sibling of die, NULL if no sibling. */
22312 static struct die_info *
22313 sibling_die (struct die_info *die)
22315 return die->sibling;
22318 /* Get name of a die, return NULL if not found. */
22320 static const char *
22321 dwarf2_canonicalize_name (const char *name, struct dwarf2_cu *cu,
22322 struct obstack *obstack)
22324 if (name && cu->language == language_cplus)
22326 std::string canon_name = cp_canonicalize_string (name);
22328 if (!canon_name.empty ())
22330 if (canon_name != name)
22331 name = (const char *) obstack_copy0 (obstack,
22332 canon_name.c_str (),
22333 canon_name.length ());
22340 /* Get name of a die, return NULL if not found.
22341 Anonymous namespaces are converted to their magic string. */
22343 static const char *
22344 dwarf2_name (struct die_info *die, struct dwarf2_cu *cu)
22346 struct attribute *attr;
22347 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
22349 attr = dwarf2_attr (die, DW_AT_name, cu);
22350 if ((!attr || !DW_STRING (attr))
22351 && die->tag != DW_TAG_namespace
22352 && die->tag != DW_TAG_class_type
22353 && die->tag != DW_TAG_interface_type
22354 && die->tag != DW_TAG_structure_type
22355 && die->tag != DW_TAG_union_type)
22360 case DW_TAG_compile_unit:
22361 case DW_TAG_partial_unit:
22362 /* Compilation units have a DW_AT_name that is a filename, not
22363 a source language identifier. */
22364 case DW_TAG_enumeration_type:
22365 case DW_TAG_enumerator:
22366 /* These tags always have simple identifiers already; no need
22367 to canonicalize them. */
22368 return DW_STRING (attr);
22370 case DW_TAG_namespace:
22371 if (attr != NULL && DW_STRING (attr) != NULL)
22372 return DW_STRING (attr);
22373 return CP_ANONYMOUS_NAMESPACE_STR;
22375 case DW_TAG_class_type:
22376 case DW_TAG_interface_type:
22377 case DW_TAG_structure_type:
22378 case DW_TAG_union_type:
22379 /* Some GCC versions emit spurious DW_AT_name attributes for unnamed
22380 structures or unions. These were of the form "._%d" in GCC 4.1,
22381 or simply "<anonymous struct>" or "<anonymous union>" in GCC 4.3
22382 and GCC 4.4. We work around this problem by ignoring these. */
22383 if (attr && DW_STRING (attr)
22384 && (startswith (DW_STRING (attr), "._")
22385 || startswith (DW_STRING (attr), "<anonymous")))
22388 /* GCC might emit a nameless typedef that has a linkage name. See
22389 http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47510. */
22390 if (!attr || DW_STRING (attr) == NULL)
22392 char *demangled = NULL;
22394 attr = dw2_linkage_name_attr (die, cu);
22395 if (attr == NULL || DW_STRING (attr) == NULL)
22398 /* Avoid demangling DW_STRING (attr) the second time on a second
22399 call for the same DIE. */
22400 if (!DW_STRING_IS_CANONICAL (attr))
22401 demangled = gdb_demangle (DW_STRING (attr), DMGL_TYPES);
22407 /* FIXME: we already did this for the partial symbol... */
22410 obstack_copy0 (&objfile->per_bfd->storage_obstack,
22411 demangled, strlen (demangled)));
22412 DW_STRING_IS_CANONICAL (attr) = 1;
22415 /* Strip any leading namespaces/classes, keep only the base name.
22416 DW_AT_name for named DIEs does not contain the prefixes. */
22417 base = strrchr (DW_STRING (attr), ':');
22418 if (base && base > DW_STRING (attr) && base[-1] == ':')
22421 return DW_STRING (attr);
22430 if (!DW_STRING_IS_CANONICAL (attr))
22433 = dwarf2_canonicalize_name (DW_STRING (attr), cu,
22434 &objfile->per_bfd->storage_obstack);
22435 DW_STRING_IS_CANONICAL (attr) = 1;
22437 return DW_STRING (attr);
22440 /* Return the die that this die in an extension of, or NULL if there
22441 is none. *EXT_CU is the CU containing DIE on input, and the CU
22442 containing the return value on output. */
22444 static struct die_info *
22445 dwarf2_extension (struct die_info *die, struct dwarf2_cu **ext_cu)
22447 struct attribute *attr;
22449 attr = dwarf2_attr (die, DW_AT_extension, *ext_cu);
22453 return follow_die_ref (die, attr, ext_cu);
22456 /* Convert a DIE tag into its string name. */
22458 static const char *
22459 dwarf_tag_name (unsigned tag)
22461 const char *name = get_DW_TAG_name (tag);
22464 return "DW_TAG_<unknown>";
22469 /* Convert a DWARF attribute code into its string name. */
22471 static const char *
22472 dwarf_attr_name (unsigned attr)
22476 #ifdef MIPS /* collides with DW_AT_HP_block_index */
22477 if (attr == DW_AT_MIPS_fde)
22478 return "DW_AT_MIPS_fde";
22480 if (attr == DW_AT_HP_block_index)
22481 return "DW_AT_HP_block_index";
22484 name = get_DW_AT_name (attr);
22487 return "DW_AT_<unknown>";
22492 /* Convert a DWARF value form code into its string name. */
22494 static const char *
22495 dwarf_form_name (unsigned form)
22497 const char *name = get_DW_FORM_name (form);
22500 return "DW_FORM_<unknown>";
22505 static const char *
22506 dwarf_bool_name (unsigned mybool)
22514 /* Convert a DWARF type code into its string name. */
22516 static const char *
22517 dwarf_type_encoding_name (unsigned enc)
22519 const char *name = get_DW_ATE_name (enc);
22522 return "DW_ATE_<unknown>";
22528 dump_die_shallow (struct ui_file *f, int indent, struct die_info *die)
22532 print_spaces (indent, f);
22533 fprintf_unfiltered (f, "Die: %s (abbrev %d, offset %s)\n",
22534 dwarf_tag_name (die->tag), die->abbrev,
22535 sect_offset_str (die->sect_off));
22537 if (die->parent != NULL)
22539 print_spaces (indent, f);
22540 fprintf_unfiltered (f, " parent at offset: %s\n",
22541 sect_offset_str (die->parent->sect_off));
22544 print_spaces (indent, f);
22545 fprintf_unfiltered (f, " has children: %s\n",
22546 dwarf_bool_name (die->child != NULL));
22548 print_spaces (indent, f);
22549 fprintf_unfiltered (f, " attributes:\n");
22551 for (i = 0; i < die->num_attrs; ++i)
22553 print_spaces (indent, f);
22554 fprintf_unfiltered (f, " %s (%s) ",
22555 dwarf_attr_name (die->attrs[i].name),
22556 dwarf_form_name (die->attrs[i].form));
22558 switch (die->attrs[i].form)
22561 case DW_FORM_GNU_addr_index:
22562 fprintf_unfiltered (f, "address: ");
22563 fputs_filtered (hex_string (DW_ADDR (&die->attrs[i])), f);
22565 case DW_FORM_block2:
22566 case DW_FORM_block4:
22567 case DW_FORM_block:
22568 case DW_FORM_block1:
22569 fprintf_unfiltered (f, "block: size %s",
22570 pulongest (DW_BLOCK (&die->attrs[i])->size));
22572 case DW_FORM_exprloc:
22573 fprintf_unfiltered (f, "expression: size %s",
22574 pulongest (DW_BLOCK (&die->attrs[i])->size));
22576 case DW_FORM_data16:
22577 fprintf_unfiltered (f, "constant of 16 bytes");
22579 case DW_FORM_ref_addr:
22580 fprintf_unfiltered (f, "ref address: ");
22581 fputs_filtered (hex_string (DW_UNSND (&die->attrs[i])), f);
22583 case DW_FORM_GNU_ref_alt:
22584 fprintf_unfiltered (f, "alt ref address: ");
22585 fputs_filtered (hex_string (DW_UNSND (&die->attrs[i])), f);
22591 case DW_FORM_ref_udata:
22592 fprintf_unfiltered (f, "constant ref: 0x%lx (adjusted)",
22593 (long) (DW_UNSND (&die->attrs[i])));
22595 case DW_FORM_data1:
22596 case DW_FORM_data2:
22597 case DW_FORM_data4:
22598 case DW_FORM_data8:
22599 case DW_FORM_udata:
22600 case DW_FORM_sdata:
22601 fprintf_unfiltered (f, "constant: %s",
22602 pulongest (DW_UNSND (&die->attrs[i])));
22604 case DW_FORM_sec_offset:
22605 fprintf_unfiltered (f, "section offset: %s",
22606 pulongest (DW_UNSND (&die->attrs[i])));
22608 case DW_FORM_ref_sig8:
22609 fprintf_unfiltered (f, "signature: %s",
22610 hex_string (DW_SIGNATURE (&die->attrs[i])));
22612 case DW_FORM_string:
22614 case DW_FORM_line_strp:
22615 case DW_FORM_GNU_str_index:
22616 case DW_FORM_GNU_strp_alt:
22617 fprintf_unfiltered (f, "string: \"%s\" (%s canonicalized)",
22618 DW_STRING (&die->attrs[i])
22619 ? DW_STRING (&die->attrs[i]) : "",
22620 DW_STRING_IS_CANONICAL (&die->attrs[i]) ? "is" : "not");
22623 if (DW_UNSND (&die->attrs[i]))
22624 fprintf_unfiltered (f, "flag: TRUE");
22626 fprintf_unfiltered (f, "flag: FALSE");
22628 case DW_FORM_flag_present:
22629 fprintf_unfiltered (f, "flag: TRUE");
22631 case DW_FORM_indirect:
22632 /* The reader will have reduced the indirect form to
22633 the "base form" so this form should not occur. */
22634 fprintf_unfiltered (f,
22635 "unexpected attribute form: DW_FORM_indirect");
22637 case DW_FORM_implicit_const:
22638 fprintf_unfiltered (f, "constant: %s",
22639 plongest (DW_SND (&die->attrs[i])));
22642 fprintf_unfiltered (f, "unsupported attribute form: %d.",
22643 die->attrs[i].form);
22646 fprintf_unfiltered (f, "\n");
22651 dump_die_for_error (struct die_info *die)
22653 dump_die_shallow (gdb_stderr, 0, die);
22657 dump_die_1 (struct ui_file *f, int level, int max_level, struct die_info *die)
22659 int indent = level * 4;
22661 gdb_assert (die != NULL);
22663 if (level >= max_level)
22666 dump_die_shallow (f, indent, die);
22668 if (die->child != NULL)
22670 print_spaces (indent, f);
22671 fprintf_unfiltered (f, " Children:");
22672 if (level + 1 < max_level)
22674 fprintf_unfiltered (f, "\n");
22675 dump_die_1 (f, level + 1, max_level, die->child);
22679 fprintf_unfiltered (f,
22680 " [not printed, max nesting level reached]\n");
22684 if (die->sibling != NULL && level > 0)
22686 dump_die_1 (f, level, max_level, die->sibling);
22690 /* This is called from the pdie macro in gdbinit.in.
22691 It's not static so gcc will keep a copy callable from gdb. */
22694 dump_die (struct die_info *die, int max_level)
22696 dump_die_1 (gdb_stdlog, 0, max_level, die);
22700 store_in_ref_table (struct die_info *die, struct dwarf2_cu *cu)
22704 slot = htab_find_slot_with_hash (cu->die_hash, die,
22705 to_underlying (die->sect_off),
22711 /* Return DIE offset of ATTR. Return 0 with complaint if ATTR is not of the
22715 dwarf2_get_ref_die_offset (const struct attribute *attr)
22717 if (attr_form_is_ref (attr))
22718 return (sect_offset) DW_UNSND (attr);
22720 complaint (_("unsupported die ref attribute form: '%s'"),
22721 dwarf_form_name (attr->form));
22725 /* Return the constant value held by ATTR. Return DEFAULT_VALUE if
22726 * the value held by the attribute is not constant. */
22729 dwarf2_get_attr_constant_value (const struct attribute *attr, int default_value)
22731 if (attr->form == DW_FORM_sdata || attr->form == DW_FORM_implicit_const)
22732 return DW_SND (attr);
22733 else if (attr->form == DW_FORM_udata
22734 || attr->form == DW_FORM_data1
22735 || attr->form == DW_FORM_data2
22736 || attr->form == DW_FORM_data4
22737 || attr->form == DW_FORM_data8)
22738 return DW_UNSND (attr);
22741 /* For DW_FORM_data16 see attr_form_is_constant. */
22742 complaint (_("Attribute value is not a constant (%s)"),
22743 dwarf_form_name (attr->form));
22744 return default_value;
22748 /* Follow reference or signature attribute ATTR of SRC_DIE.
22749 On entry *REF_CU is the CU of SRC_DIE.
22750 On exit *REF_CU is the CU of the result. */
22752 static struct die_info *
22753 follow_die_ref_or_sig (struct die_info *src_die, const struct attribute *attr,
22754 struct dwarf2_cu **ref_cu)
22756 struct die_info *die;
22758 if (attr_form_is_ref (attr))
22759 die = follow_die_ref (src_die, attr, ref_cu);
22760 else if (attr->form == DW_FORM_ref_sig8)
22761 die = follow_die_sig (src_die, attr, ref_cu);
22764 dump_die_for_error (src_die);
22765 error (_("Dwarf Error: Expected reference attribute [in module %s]"),
22766 objfile_name ((*ref_cu)->per_cu->dwarf2_per_objfile->objfile));
22772 /* Follow reference OFFSET.
22773 On entry *REF_CU is the CU of the source die referencing OFFSET.
22774 On exit *REF_CU is the CU of the result.
22775 Returns NULL if OFFSET is invalid. */
22777 static struct die_info *
22778 follow_die_offset (sect_offset sect_off, int offset_in_dwz,
22779 struct dwarf2_cu **ref_cu)
22781 struct die_info temp_die;
22782 struct dwarf2_cu *target_cu, *cu = *ref_cu;
22783 struct dwarf2_per_objfile *dwarf2_per_objfile
22784 = cu->per_cu->dwarf2_per_objfile;
22786 gdb_assert (cu->per_cu != NULL);
22790 if (cu->per_cu->is_debug_types)
22792 /* .debug_types CUs cannot reference anything outside their CU.
22793 If they need to, they have to reference a signatured type via
22794 DW_FORM_ref_sig8. */
22795 if (!offset_in_cu_p (&cu->header, sect_off))
22798 else if (offset_in_dwz != cu->per_cu->is_dwz
22799 || !offset_in_cu_p (&cu->header, sect_off))
22801 struct dwarf2_per_cu_data *per_cu;
22803 per_cu = dwarf2_find_containing_comp_unit (sect_off, offset_in_dwz,
22804 dwarf2_per_objfile);
22806 /* If necessary, add it to the queue and load its DIEs. */
22807 if (maybe_queue_comp_unit (cu, per_cu, cu->language))
22808 load_full_comp_unit (per_cu, false, cu->language);
22810 target_cu = per_cu->cu;
22812 else if (cu->dies == NULL)
22814 /* We're loading full DIEs during partial symbol reading. */
22815 gdb_assert (dwarf2_per_objfile->reading_partial_symbols);
22816 load_full_comp_unit (cu->per_cu, false, language_minimal);
22819 *ref_cu = target_cu;
22820 temp_die.sect_off = sect_off;
22821 return (struct die_info *) htab_find_with_hash (target_cu->die_hash,
22823 to_underlying (sect_off));
22826 /* Follow reference attribute ATTR of SRC_DIE.
22827 On entry *REF_CU is the CU of SRC_DIE.
22828 On exit *REF_CU is the CU of the result. */
22830 static struct die_info *
22831 follow_die_ref (struct die_info *src_die, const struct attribute *attr,
22832 struct dwarf2_cu **ref_cu)
22834 sect_offset sect_off = dwarf2_get_ref_die_offset (attr);
22835 struct dwarf2_cu *cu = *ref_cu;
22836 struct die_info *die;
22838 die = follow_die_offset (sect_off,
22839 (attr->form == DW_FORM_GNU_ref_alt
22840 || cu->per_cu->is_dwz),
22843 error (_("Dwarf Error: Cannot find DIE at %s referenced from DIE "
22844 "at %s [in module %s]"),
22845 sect_offset_str (sect_off), sect_offset_str (src_die->sect_off),
22846 objfile_name (cu->per_cu->dwarf2_per_objfile->objfile));
22851 /* Return DWARF block referenced by DW_AT_location of DIE at SECT_OFF at PER_CU.
22852 Returned value is intended for DW_OP_call*. Returned
22853 dwarf2_locexpr_baton->data has lifetime of
22854 PER_CU->DWARF2_PER_OBJFILE->OBJFILE. */
22856 struct dwarf2_locexpr_baton
22857 dwarf2_fetch_die_loc_sect_off (sect_offset sect_off,
22858 struct dwarf2_per_cu_data *per_cu,
22859 CORE_ADDR (*get_frame_pc) (void *baton),
22862 struct dwarf2_cu *cu;
22863 struct die_info *die;
22864 struct attribute *attr;
22865 struct dwarf2_locexpr_baton retval;
22866 struct dwarf2_per_objfile *dwarf2_per_objfile = per_cu->dwarf2_per_objfile;
22867 struct objfile *objfile = dwarf2_per_objfile->objfile;
22869 if (per_cu->cu == NULL)
22870 load_cu (per_cu, false);
22874 /* We shouldn't get here for a dummy CU, but don't crash on the user.
22875 Instead just throw an error, not much else we can do. */
22876 error (_("Dwarf Error: Dummy CU at %s referenced in module %s"),
22877 sect_offset_str (sect_off), objfile_name (objfile));
22880 die = follow_die_offset (sect_off, per_cu->is_dwz, &cu);
22882 error (_("Dwarf Error: Cannot find DIE at %s referenced in module %s"),
22883 sect_offset_str (sect_off), objfile_name (objfile));
22885 attr = dwarf2_attr (die, DW_AT_location, cu);
22888 /* DWARF: "If there is no such attribute, then there is no effect.".
22889 DATA is ignored if SIZE is 0. */
22891 retval.data = NULL;
22894 else if (attr_form_is_section_offset (attr))
22896 struct dwarf2_loclist_baton loclist_baton;
22897 CORE_ADDR pc = (*get_frame_pc) (baton);
22900 fill_in_loclist_baton (cu, &loclist_baton, attr);
22902 retval.data = dwarf2_find_location_expression (&loclist_baton,
22904 retval.size = size;
22908 if (!attr_form_is_block (attr))
22909 error (_("Dwarf Error: DIE at %s referenced in module %s "
22910 "is neither DW_FORM_block* nor DW_FORM_exprloc"),
22911 sect_offset_str (sect_off), objfile_name (objfile));
22913 retval.data = DW_BLOCK (attr)->data;
22914 retval.size = DW_BLOCK (attr)->size;
22916 retval.per_cu = cu->per_cu;
22918 age_cached_comp_units (dwarf2_per_objfile);
22923 /* Like dwarf2_fetch_die_loc_sect_off, but take a CU
22926 struct dwarf2_locexpr_baton
22927 dwarf2_fetch_die_loc_cu_off (cu_offset offset_in_cu,
22928 struct dwarf2_per_cu_data *per_cu,
22929 CORE_ADDR (*get_frame_pc) (void *baton),
22932 sect_offset sect_off = per_cu->sect_off + to_underlying (offset_in_cu);
22934 return dwarf2_fetch_die_loc_sect_off (sect_off, per_cu, get_frame_pc, baton);
22937 /* Write a constant of a given type as target-ordered bytes into
22940 static const gdb_byte *
22941 write_constant_as_bytes (struct obstack *obstack,
22942 enum bfd_endian byte_order,
22949 *len = TYPE_LENGTH (type);
22950 result = (gdb_byte *) obstack_alloc (obstack, *len);
22951 store_unsigned_integer (result, *len, byte_order, value);
22956 /* If the DIE at OFFSET in PER_CU has a DW_AT_const_value, return a
22957 pointer to the constant bytes and set LEN to the length of the
22958 data. If memory is needed, allocate it on OBSTACK. If the DIE
22959 does not have a DW_AT_const_value, return NULL. */
22962 dwarf2_fetch_constant_bytes (sect_offset sect_off,
22963 struct dwarf2_per_cu_data *per_cu,
22964 struct obstack *obstack,
22967 struct dwarf2_cu *cu;
22968 struct die_info *die;
22969 struct attribute *attr;
22970 const gdb_byte *result = NULL;
22973 enum bfd_endian byte_order;
22974 struct objfile *objfile = per_cu->dwarf2_per_objfile->objfile;
22976 if (per_cu->cu == NULL)
22977 load_cu (per_cu, false);
22981 /* We shouldn't get here for a dummy CU, but don't crash on the user.
22982 Instead just throw an error, not much else we can do. */
22983 error (_("Dwarf Error: Dummy CU at %s referenced in module %s"),
22984 sect_offset_str (sect_off), objfile_name (objfile));
22987 die = follow_die_offset (sect_off, per_cu->is_dwz, &cu);
22989 error (_("Dwarf Error: Cannot find DIE at %s referenced in module %s"),
22990 sect_offset_str (sect_off), objfile_name (objfile));
22992 attr = dwarf2_attr (die, DW_AT_const_value, cu);
22996 byte_order = (bfd_big_endian (objfile->obfd)
22997 ? BFD_ENDIAN_BIG : BFD_ENDIAN_LITTLE);
22999 switch (attr->form)
23002 case DW_FORM_GNU_addr_index:
23006 *len = cu->header.addr_size;
23007 tem = (gdb_byte *) obstack_alloc (obstack, *len);
23008 store_unsigned_integer (tem, *len, byte_order, DW_ADDR (attr));
23012 case DW_FORM_string:
23014 case DW_FORM_GNU_str_index:
23015 case DW_FORM_GNU_strp_alt:
23016 /* DW_STRING is already allocated on the objfile obstack, point
23018 result = (const gdb_byte *) DW_STRING (attr);
23019 *len = strlen (DW_STRING (attr));
23021 case DW_FORM_block1:
23022 case DW_FORM_block2:
23023 case DW_FORM_block4:
23024 case DW_FORM_block:
23025 case DW_FORM_exprloc:
23026 case DW_FORM_data16:
23027 result = DW_BLOCK (attr)->data;
23028 *len = DW_BLOCK (attr)->size;
23031 /* The DW_AT_const_value attributes are supposed to carry the
23032 symbol's value "represented as it would be on the target
23033 architecture." By the time we get here, it's already been
23034 converted to host endianness, so we just need to sign- or
23035 zero-extend it as appropriate. */
23036 case DW_FORM_data1:
23037 type = die_type (die, cu);
23038 result = dwarf2_const_value_data (attr, obstack, cu, &value, 8);
23039 if (result == NULL)
23040 result = write_constant_as_bytes (obstack, byte_order,
23043 case DW_FORM_data2:
23044 type = die_type (die, cu);
23045 result = dwarf2_const_value_data (attr, obstack, cu, &value, 16);
23046 if (result == NULL)
23047 result = write_constant_as_bytes (obstack, byte_order,
23050 case DW_FORM_data4:
23051 type = die_type (die, cu);
23052 result = dwarf2_const_value_data (attr, obstack, cu, &value, 32);
23053 if (result == NULL)
23054 result = write_constant_as_bytes (obstack, byte_order,
23057 case DW_FORM_data8:
23058 type = die_type (die, cu);
23059 result = dwarf2_const_value_data (attr, obstack, cu, &value, 64);
23060 if (result == NULL)
23061 result = write_constant_as_bytes (obstack, byte_order,
23065 case DW_FORM_sdata:
23066 case DW_FORM_implicit_const:
23067 type = die_type (die, cu);
23068 result = write_constant_as_bytes (obstack, byte_order,
23069 type, DW_SND (attr), len);
23072 case DW_FORM_udata:
23073 type = die_type (die, cu);
23074 result = write_constant_as_bytes (obstack, byte_order,
23075 type, DW_UNSND (attr), len);
23079 complaint (_("unsupported const value attribute form: '%s'"),
23080 dwarf_form_name (attr->form));
23087 /* Return the type of the die at OFFSET in PER_CU. Return NULL if no
23088 valid type for this die is found. */
23091 dwarf2_fetch_die_type_sect_off (sect_offset sect_off,
23092 struct dwarf2_per_cu_data *per_cu)
23094 struct dwarf2_cu *cu;
23095 struct die_info *die;
23097 if (per_cu->cu == NULL)
23098 load_cu (per_cu, false);
23103 die = follow_die_offset (sect_off, per_cu->is_dwz, &cu);
23107 return die_type (die, cu);
23110 /* Return the type of the DIE at DIE_OFFSET in the CU named by
23114 dwarf2_get_die_type (cu_offset die_offset,
23115 struct dwarf2_per_cu_data *per_cu)
23117 sect_offset die_offset_sect = per_cu->sect_off + to_underlying (die_offset);
23118 return get_die_type_at_offset (die_offset_sect, per_cu);
23121 /* Follow type unit SIG_TYPE referenced by SRC_DIE.
23122 On entry *REF_CU is the CU of SRC_DIE.
23123 On exit *REF_CU is the CU of the result.
23124 Returns NULL if the referenced DIE isn't found. */
23126 static struct die_info *
23127 follow_die_sig_1 (struct die_info *src_die, struct signatured_type *sig_type,
23128 struct dwarf2_cu **ref_cu)
23130 struct die_info temp_die;
23131 struct dwarf2_cu *sig_cu;
23132 struct die_info *die;
23134 /* While it might be nice to assert sig_type->type == NULL here,
23135 we can get here for DW_AT_imported_declaration where we need
23136 the DIE not the type. */
23138 /* If necessary, add it to the queue and load its DIEs. */
23140 if (maybe_queue_comp_unit (*ref_cu, &sig_type->per_cu, language_minimal))
23141 read_signatured_type (sig_type);
23143 sig_cu = sig_type->per_cu.cu;
23144 gdb_assert (sig_cu != NULL);
23145 gdb_assert (to_underlying (sig_type->type_offset_in_section) != 0);
23146 temp_die.sect_off = sig_type->type_offset_in_section;
23147 die = (struct die_info *) htab_find_with_hash (sig_cu->die_hash, &temp_die,
23148 to_underlying (temp_die.sect_off));
23151 struct dwarf2_per_objfile *dwarf2_per_objfile
23152 = (*ref_cu)->per_cu->dwarf2_per_objfile;
23154 /* For .gdb_index version 7 keep track of included TUs.
23155 http://sourceware.org/bugzilla/show_bug.cgi?id=15021. */
23156 if (dwarf2_per_objfile->index_table != NULL
23157 && dwarf2_per_objfile->index_table->version <= 7)
23159 VEC_safe_push (dwarf2_per_cu_ptr,
23160 (*ref_cu)->per_cu->imported_symtabs,
23171 /* Follow signatured type referenced by ATTR in SRC_DIE.
23172 On entry *REF_CU is the CU of SRC_DIE.
23173 On exit *REF_CU is the CU of the result.
23174 The result is the DIE of the type.
23175 If the referenced type cannot be found an error is thrown. */
23177 static struct die_info *
23178 follow_die_sig (struct die_info *src_die, const struct attribute *attr,
23179 struct dwarf2_cu **ref_cu)
23181 ULONGEST signature = DW_SIGNATURE (attr);
23182 struct signatured_type *sig_type;
23183 struct die_info *die;
23185 gdb_assert (attr->form == DW_FORM_ref_sig8);
23187 sig_type = lookup_signatured_type (*ref_cu, signature);
23188 /* sig_type will be NULL if the signatured type is missing from
23190 if (sig_type == NULL)
23192 error (_("Dwarf Error: Cannot find signatured DIE %s referenced"
23193 " from DIE at %s [in module %s]"),
23194 hex_string (signature), sect_offset_str (src_die->sect_off),
23195 objfile_name ((*ref_cu)->per_cu->dwarf2_per_objfile->objfile));
23198 die = follow_die_sig_1 (src_die, sig_type, ref_cu);
23201 dump_die_for_error (src_die);
23202 error (_("Dwarf Error: Problem reading signatured DIE %s referenced"
23203 " from DIE at %s [in module %s]"),
23204 hex_string (signature), sect_offset_str (src_die->sect_off),
23205 objfile_name ((*ref_cu)->per_cu->dwarf2_per_objfile->objfile));
23211 /* Get the type specified by SIGNATURE referenced in DIE/CU,
23212 reading in and processing the type unit if necessary. */
23214 static struct type *
23215 get_signatured_type (struct die_info *die, ULONGEST signature,
23216 struct dwarf2_cu *cu)
23218 struct dwarf2_per_objfile *dwarf2_per_objfile
23219 = cu->per_cu->dwarf2_per_objfile;
23220 struct signatured_type *sig_type;
23221 struct dwarf2_cu *type_cu;
23222 struct die_info *type_die;
23225 sig_type = lookup_signatured_type (cu, signature);
23226 /* sig_type will be NULL if the signatured type is missing from
23228 if (sig_type == NULL)
23230 complaint (_("Dwarf Error: Cannot find signatured DIE %s referenced"
23231 " from DIE at %s [in module %s]"),
23232 hex_string (signature), sect_offset_str (die->sect_off),
23233 objfile_name (dwarf2_per_objfile->objfile));
23234 return build_error_marker_type (cu, die);
23237 /* If we already know the type we're done. */
23238 if (sig_type->type != NULL)
23239 return sig_type->type;
23242 type_die = follow_die_sig_1 (die, sig_type, &type_cu);
23243 if (type_die != NULL)
23245 /* N.B. We need to call get_die_type to ensure only one type for this DIE
23246 is created. This is important, for example, because for c++ classes
23247 we need TYPE_NAME set which is only done by new_symbol. Blech. */
23248 type = read_type_die (type_die, type_cu);
23251 complaint (_("Dwarf Error: Cannot build signatured type %s"
23252 " referenced from DIE at %s [in module %s]"),
23253 hex_string (signature), sect_offset_str (die->sect_off),
23254 objfile_name (dwarf2_per_objfile->objfile));
23255 type = build_error_marker_type (cu, die);
23260 complaint (_("Dwarf Error: Problem reading signatured DIE %s referenced"
23261 " from DIE at %s [in module %s]"),
23262 hex_string (signature), sect_offset_str (die->sect_off),
23263 objfile_name (dwarf2_per_objfile->objfile));
23264 type = build_error_marker_type (cu, die);
23266 sig_type->type = type;
23271 /* Get the type specified by the DW_AT_signature ATTR in DIE/CU,
23272 reading in and processing the type unit if necessary. */
23274 static struct type *
23275 get_DW_AT_signature_type (struct die_info *die, const struct attribute *attr,
23276 struct dwarf2_cu *cu) /* ARI: editCase function */
23278 /* Yes, DW_AT_signature can use a non-ref_sig8 reference. */
23279 if (attr_form_is_ref (attr))
23281 struct dwarf2_cu *type_cu = cu;
23282 struct die_info *type_die = follow_die_ref (die, attr, &type_cu);
23284 return read_type_die (type_die, type_cu);
23286 else if (attr->form == DW_FORM_ref_sig8)
23288 return get_signatured_type (die, DW_SIGNATURE (attr), cu);
23292 struct dwarf2_per_objfile *dwarf2_per_objfile
23293 = cu->per_cu->dwarf2_per_objfile;
23295 complaint (_("Dwarf Error: DW_AT_signature has bad form %s in DIE"
23296 " at %s [in module %s]"),
23297 dwarf_form_name (attr->form), sect_offset_str (die->sect_off),
23298 objfile_name (dwarf2_per_objfile->objfile));
23299 return build_error_marker_type (cu, die);
23303 /* Load the DIEs associated with type unit PER_CU into memory. */
23306 load_full_type_unit (struct dwarf2_per_cu_data *per_cu)
23308 struct signatured_type *sig_type;
23310 /* Caller is responsible for ensuring type_unit_groups don't get here. */
23311 gdb_assert (! IS_TYPE_UNIT_GROUP (per_cu));
23313 /* We have the per_cu, but we need the signatured_type.
23314 Fortunately this is an easy translation. */
23315 gdb_assert (per_cu->is_debug_types);
23316 sig_type = (struct signatured_type *) per_cu;
23318 gdb_assert (per_cu->cu == NULL);
23320 read_signatured_type (sig_type);
23322 gdb_assert (per_cu->cu != NULL);
23325 /* die_reader_func for read_signatured_type.
23326 This is identical to load_full_comp_unit_reader,
23327 but is kept separate for now. */
23330 read_signatured_type_reader (const struct die_reader_specs *reader,
23331 const gdb_byte *info_ptr,
23332 struct die_info *comp_unit_die,
23336 struct dwarf2_cu *cu = reader->cu;
23338 gdb_assert (cu->die_hash == NULL);
23340 htab_create_alloc_ex (cu->header.length / 12,
23344 &cu->comp_unit_obstack,
23345 hashtab_obstack_allocate,
23346 dummy_obstack_deallocate);
23349 comp_unit_die->child = read_die_and_siblings (reader, info_ptr,
23350 &info_ptr, comp_unit_die);
23351 cu->dies = comp_unit_die;
23352 /* comp_unit_die is not stored in die_hash, no need. */
23354 /* We try not to read any attributes in this function, because not
23355 all CUs needed for references have been loaded yet, and symbol
23356 table processing isn't initialized. But we have to set the CU language,
23357 or we won't be able to build types correctly.
23358 Similarly, if we do not read the producer, we can not apply
23359 producer-specific interpretation. */
23360 prepare_one_comp_unit (cu, cu->dies, language_minimal);
23363 /* Read in a signatured type and build its CU and DIEs.
23364 If the type is a stub for the real type in a DWO file,
23365 read in the real type from the DWO file as well. */
23368 read_signatured_type (struct signatured_type *sig_type)
23370 struct dwarf2_per_cu_data *per_cu = &sig_type->per_cu;
23372 gdb_assert (per_cu->is_debug_types);
23373 gdb_assert (per_cu->cu == NULL);
23375 init_cutu_and_read_dies (per_cu, NULL, 0, 1, false,
23376 read_signatured_type_reader, NULL);
23377 sig_type->per_cu.tu_read = 1;
23380 /* Decode simple location descriptions.
23381 Given a pointer to a dwarf block that defines a location, compute
23382 the location and return the value.
23384 NOTE drow/2003-11-18: This function is called in two situations
23385 now: for the address of static or global variables (partial symbols
23386 only) and for offsets into structures which are expected to be
23387 (more or less) constant. The partial symbol case should go away,
23388 and only the constant case should remain. That will let this
23389 function complain more accurately. A few special modes are allowed
23390 without complaint for global variables (for instance, global
23391 register values and thread-local values).
23393 A location description containing no operations indicates that the
23394 object is optimized out. The return value is 0 for that case.
23395 FIXME drow/2003-11-16: No callers check for this case any more; soon all
23396 callers will only want a very basic result and this can become a
23399 Note that stack[0] is unused except as a default error return. */
23402 decode_locdesc (struct dwarf_block *blk, struct dwarf2_cu *cu)
23404 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
23406 size_t size = blk->size;
23407 const gdb_byte *data = blk->data;
23408 CORE_ADDR stack[64];
23410 unsigned int bytes_read, unsnd;
23416 stack[++stacki] = 0;
23455 stack[++stacki] = op - DW_OP_lit0;
23490 stack[++stacki] = op - DW_OP_reg0;
23492 dwarf2_complex_location_expr_complaint ();
23496 unsnd = read_unsigned_leb128 (NULL, (data + i), &bytes_read);
23498 stack[++stacki] = unsnd;
23500 dwarf2_complex_location_expr_complaint ();
23504 stack[++stacki] = read_address (objfile->obfd, &data[i],
23509 case DW_OP_const1u:
23510 stack[++stacki] = read_1_byte (objfile->obfd, &data[i]);
23514 case DW_OP_const1s:
23515 stack[++stacki] = read_1_signed_byte (objfile->obfd, &data[i]);
23519 case DW_OP_const2u:
23520 stack[++stacki] = read_2_bytes (objfile->obfd, &data[i]);
23524 case DW_OP_const2s:
23525 stack[++stacki] = read_2_signed_bytes (objfile->obfd, &data[i]);
23529 case DW_OP_const4u:
23530 stack[++stacki] = read_4_bytes (objfile->obfd, &data[i]);
23534 case DW_OP_const4s:
23535 stack[++stacki] = read_4_signed_bytes (objfile->obfd, &data[i]);
23539 case DW_OP_const8u:
23540 stack[++stacki] = read_8_bytes (objfile->obfd, &data[i]);
23545 stack[++stacki] = read_unsigned_leb128 (NULL, (data + i),
23551 stack[++stacki] = read_signed_leb128 (NULL, (data + i), &bytes_read);
23556 stack[stacki + 1] = stack[stacki];
23561 stack[stacki - 1] += stack[stacki];
23565 case DW_OP_plus_uconst:
23566 stack[stacki] += read_unsigned_leb128 (NULL, (data + i),
23572 stack[stacki - 1] -= stack[stacki];
23577 /* If we're not the last op, then we definitely can't encode
23578 this using GDB's address_class enum. This is valid for partial
23579 global symbols, although the variable's address will be bogus
23582 dwarf2_complex_location_expr_complaint ();
23585 case DW_OP_GNU_push_tls_address:
23586 case DW_OP_form_tls_address:
23587 /* The top of the stack has the offset from the beginning
23588 of the thread control block at which the variable is located. */
23589 /* Nothing should follow this operator, so the top of stack would
23591 /* This is valid for partial global symbols, but the variable's
23592 address will be bogus in the psymtab. Make it always at least
23593 non-zero to not look as a variable garbage collected by linker
23594 which have DW_OP_addr 0. */
23596 dwarf2_complex_location_expr_complaint ();
23600 case DW_OP_GNU_uninit:
23603 case DW_OP_GNU_addr_index:
23604 case DW_OP_GNU_const_index:
23605 stack[++stacki] = read_addr_index_from_leb128 (cu, &data[i],
23612 const char *name = get_DW_OP_name (op);
23615 complaint (_("unsupported stack op: '%s'"),
23618 complaint (_("unsupported stack op: '%02x'"),
23622 return (stack[stacki]);
23625 /* Enforce maximum stack depth of SIZE-1 to avoid writing
23626 outside of the allocated space. Also enforce minimum>0. */
23627 if (stacki >= ARRAY_SIZE (stack) - 1)
23629 complaint (_("location description stack overflow"));
23635 complaint (_("location description stack underflow"));
23639 return (stack[stacki]);
23642 /* memory allocation interface */
23644 static struct dwarf_block *
23645 dwarf_alloc_block (struct dwarf2_cu *cu)
23647 return XOBNEW (&cu->comp_unit_obstack, struct dwarf_block);
23650 static struct die_info *
23651 dwarf_alloc_die (struct dwarf2_cu *cu, int num_attrs)
23653 struct die_info *die;
23654 size_t size = sizeof (struct die_info);
23657 size += (num_attrs - 1) * sizeof (struct attribute);
23659 die = (struct die_info *) obstack_alloc (&cu->comp_unit_obstack, size);
23660 memset (die, 0, sizeof (struct die_info));
23665 /* Macro support. */
23667 /* Return file name relative to the compilation directory of file number I in
23668 *LH's file name table. The result is allocated using xmalloc; the caller is
23669 responsible for freeing it. */
23672 file_file_name (int file, struct line_header *lh)
23674 /* Is the file number a valid index into the line header's file name
23675 table? Remember that file numbers start with one, not zero. */
23676 if (1 <= file && file <= lh->file_names.size ())
23678 const file_entry &fe = lh->file_names[file - 1];
23680 if (!IS_ABSOLUTE_PATH (fe.name))
23682 const char *dir = fe.include_dir (lh);
23684 return concat (dir, SLASH_STRING, fe.name, (char *) NULL);
23686 return xstrdup (fe.name);
23690 /* The compiler produced a bogus file number. We can at least
23691 record the macro definitions made in the file, even if we
23692 won't be able to find the file by name. */
23693 char fake_name[80];
23695 xsnprintf (fake_name, sizeof (fake_name),
23696 "<bad macro file number %d>", file);
23698 complaint (_("bad file number in macro information (%d)"),
23701 return xstrdup (fake_name);
23705 /* Return the full name of file number I in *LH's file name table.
23706 Use COMP_DIR as the name of the current directory of the
23707 compilation. The result is allocated using xmalloc; the caller is
23708 responsible for freeing it. */
23710 file_full_name (int file, struct line_header *lh, const char *comp_dir)
23712 /* Is the file number a valid index into the line header's file name
23713 table? Remember that file numbers start with one, not zero. */
23714 if (1 <= file && file <= lh->file_names.size ())
23716 char *relative = file_file_name (file, lh);
23718 if (IS_ABSOLUTE_PATH (relative) || comp_dir == NULL)
23720 return reconcat (relative, comp_dir, SLASH_STRING,
23721 relative, (char *) NULL);
23724 return file_file_name (file, lh);
23728 static struct macro_source_file *
23729 macro_start_file (int file, int line,
23730 struct macro_source_file *current_file,
23731 struct line_header *lh)
23733 /* File name relative to the compilation directory of this source file. */
23734 char *file_name = file_file_name (file, lh);
23736 if (! current_file)
23738 /* Note: We don't create a macro table for this compilation unit
23739 at all until we actually get a filename. */
23740 struct macro_table *macro_table = get_macro_table ();
23742 /* If we have no current file, then this must be the start_file
23743 directive for the compilation unit's main source file. */
23744 current_file = macro_set_main (macro_table, file_name);
23745 macro_define_special (macro_table);
23748 current_file = macro_include (current_file, line, file_name);
23752 return current_file;
23755 static const char *
23756 consume_improper_spaces (const char *p, const char *body)
23760 complaint (_("macro definition contains spaces "
23761 "in formal argument list:\n`%s'"),
23773 parse_macro_definition (struct macro_source_file *file, int line,
23778 /* The body string takes one of two forms. For object-like macro
23779 definitions, it should be:
23781 <macro name> " " <definition>
23783 For function-like macro definitions, it should be:
23785 <macro name> "() " <definition>
23787 <macro name> "(" <arg name> ( "," <arg name> ) * ") " <definition>
23789 Spaces may appear only where explicitly indicated, and in the
23792 The Dwarf 2 spec says that an object-like macro's name is always
23793 followed by a space, but versions of GCC around March 2002 omit
23794 the space when the macro's definition is the empty string.
23796 The Dwarf 2 spec says that there should be no spaces between the
23797 formal arguments in a function-like macro's formal argument list,
23798 but versions of GCC around March 2002 include spaces after the
23802 /* Find the extent of the macro name. The macro name is terminated
23803 by either a space or null character (for an object-like macro) or
23804 an opening paren (for a function-like macro). */
23805 for (p = body; *p; p++)
23806 if (*p == ' ' || *p == '(')
23809 if (*p == ' ' || *p == '\0')
23811 /* It's an object-like macro. */
23812 int name_len = p - body;
23813 char *name = savestring (body, name_len);
23814 const char *replacement;
23817 replacement = body + name_len + 1;
23820 dwarf2_macro_malformed_definition_complaint (body);
23821 replacement = body + name_len;
23824 macro_define_object (file, line, name, replacement);
23828 else if (*p == '(')
23830 /* It's a function-like macro. */
23831 char *name = savestring (body, p - body);
23834 char **argv = XNEWVEC (char *, argv_size);
23838 p = consume_improper_spaces (p, body);
23840 /* Parse the formal argument list. */
23841 while (*p && *p != ')')
23843 /* Find the extent of the current argument name. */
23844 const char *arg_start = p;
23846 while (*p && *p != ',' && *p != ')' && *p != ' ')
23849 if (! *p || p == arg_start)
23850 dwarf2_macro_malformed_definition_complaint (body);
23853 /* Make sure argv has room for the new argument. */
23854 if (argc >= argv_size)
23857 argv = XRESIZEVEC (char *, argv, argv_size);
23860 argv[argc++] = savestring (arg_start, p - arg_start);
23863 p = consume_improper_spaces (p, body);
23865 /* Consume the comma, if present. */
23870 p = consume_improper_spaces (p, body);
23879 /* Perfectly formed definition, no complaints. */
23880 macro_define_function (file, line, name,
23881 argc, (const char **) argv,
23883 else if (*p == '\0')
23885 /* Complain, but do define it. */
23886 dwarf2_macro_malformed_definition_complaint (body);
23887 macro_define_function (file, line, name,
23888 argc, (const char **) argv,
23892 /* Just complain. */
23893 dwarf2_macro_malformed_definition_complaint (body);
23896 /* Just complain. */
23897 dwarf2_macro_malformed_definition_complaint (body);
23903 for (i = 0; i < argc; i++)
23909 dwarf2_macro_malformed_definition_complaint (body);
23912 /* Skip some bytes from BYTES according to the form given in FORM.
23913 Returns the new pointer. */
23915 static const gdb_byte *
23916 skip_form_bytes (bfd *abfd, const gdb_byte *bytes, const gdb_byte *buffer_end,
23917 enum dwarf_form form,
23918 unsigned int offset_size,
23919 struct dwarf2_section_info *section)
23921 unsigned int bytes_read;
23925 case DW_FORM_data1:
23930 case DW_FORM_data2:
23934 case DW_FORM_data4:
23938 case DW_FORM_data8:
23942 case DW_FORM_data16:
23946 case DW_FORM_string:
23947 read_direct_string (abfd, bytes, &bytes_read);
23948 bytes += bytes_read;
23951 case DW_FORM_sec_offset:
23953 case DW_FORM_GNU_strp_alt:
23954 bytes += offset_size;
23957 case DW_FORM_block:
23958 bytes += read_unsigned_leb128 (abfd, bytes, &bytes_read);
23959 bytes += bytes_read;
23962 case DW_FORM_block1:
23963 bytes += 1 + read_1_byte (abfd, bytes);
23965 case DW_FORM_block2:
23966 bytes += 2 + read_2_bytes (abfd, bytes);
23968 case DW_FORM_block4:
23969 bytes += 4 + read_4_bytes (abfd, bytes);
23972 case DW_FORM_sdata:
23973 case DW_FORM_udata:
23974 case DW_FORM_GNU_addr_index:
23975 case DW_FORM_GNU_str_index:
23976 bytes = gdb_skip_leb128 (bytes, buffer_end);
23979 dwarf2_section_buffer_overflow_complaint (section);
23984 case DW_FORM_implicit_const:
23989 complaint (_("invalid form 0x%x in `%s'"),
23990 form, get_section_name (section));
23998 /* A helper for dwarf_decode_macros that handles skipping an unknown
23999 opcode. Returns an updated pointer to the macro data buffer; or,
24000 on error, issues a complaint and returns NULL. */
24002 static const gdb_byte *
24003 skip_unknown_opcode (unsigned int opcode,
24004 const gdb_byte **opcode_definitions,
24005 const gdb_byte *mac_ptr, const gdb_byte *mac_end,
24007 unsigned int offset_size,
24008 struct dwarf2_section_info *section)
24010 unsigned int bytes_read, i;
24012 const gdb_byte *defn;
24014 if (opcode_definitions[opcode] == NULL)
24016 complaint (_("unrecognized DW_MACFINO opcode 0x%x"),
24021 defn = opcode_definitions[opcode];
24022 arg = read_unsigned_leb128 (abfd, defn, &bytes_read);
24023 defn += bytes_read;
24025 for (i = 0; i < arg; ++i)
24027 mac_ptr = skip_form_bytes (abfd, mac_ptr, mac_end,
24028 (enum dwarf_form) defn[i], offset_size,
24030 if (mac_ptr == NULL)
24032 /* skip_form_bytes already issued the complaint. */
24040 /* A helper function which parses the header of a macro section.
24041 If the macro section is the extended (for now called "GNU") type,
24042 then this updates *OFFSET_SIZE. Returns a pointer to just after
24043 the header, or issues a complaint and returns NULL on error. */
24045 static const gdb_byte *
24046 dwarf_parse_macro_header (const gdb_byte **opcode_definitions,
24048 const gdb_byte *mac_ptr,
24049 unsigned int *offset_size,
24050 int section_is_gnu)
24052 memset (opcode_definitions, 0, 256 * sizeof (gdb_byte *));
24054 if (section_is_gnu)
24056 unsigned int version, flags;
24058 version = read_2_bytes (abfd, mac_ptr);
24059 if (version != 4 && version != 5)
24061 complaint (_("unrecognized version `%d' in .debug_macro section"),
24067 flags = read_1_byte (abfd, mac_ptr);
24069 *offset_size = (flags & 1) ? 8 : 4;
24071 if ((flags & 2) != 0)
24072 /* We don't need the line table offset. */
24073 mac_ptr += *offset_size;
24075 /* Vendor opcode descriptions. */
24076 if ((flags & 4) != 0)
24078 unsigned int i, count;
24080 count = read_1_byte (abfd, mac_ptr);
24082 for (i = 0; i < count; ++i)
24084 unsigned int opcode, bytes_read;
24087 opcode = read_1_byte (abfd, mac_ptr);
24089 opcode_definitions[opcode] = mac_ptr;
24090 arg = read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
24091 mac_ptr += bytes_read;
24100 /* A helper for dwarf_decode_macros that handles the GNU extensions,
24101 including DW_MACRO_import. */
24104 dwarf_decode_macro_bytes (struct dwarf2_per_objfile *dwarf2_per_objfile,
24106 const gdb_byte *mac_ptr, const gdb_byte *mac_end,
24107 struct macro_source_file *current_file,
24108 struct line_header *lh,
24109 struct dwarf2_section_info *section,
24110 int section_is_gnu, int section_is_dwz,
24111 unsigned int offset_size,
24112 htab_t include_hash)
24114 struct objfile *objfile = dwarf2_per_objfile->objfile;
24115 enum dwarf_macro_record_type macinfo_type;
24116 int at_commandline;
24117 const gdb_byte *opcode_definitions[256];
24119 mac_ptr = dwarf_parse_macro_header (opcode_definitions, abfd, mac_ptr,
24120 &offset_size, section_is_gnu);
24121 if (mac_ptr == NULL)
24123 /* We already issued a complaint. */
24127 /* Determines if GDB is still before first DW_MACINFO_start_file. If true
24128 GDB is still reading the definitions from command line. First
24129 DW_MACINFO_start_file will need to be ignored as it was already executed
24130 to create CURRENT_FILE for the main source holding also the command line
24131 definitions. On first met DW_MACINFO_start_file this flag is reset to
24132 normally execute all the remaining DW_MACINFO_start_file macinfos. */
24134 at_commandline = 1;
24138 /* Do we at least have room for a macinfo type byte? */
24139 if (mac_ptr >= mac_end)
24141 dwarf2_section_buffer_overflow_complaint (section);
24145 macinfo_type = (enum dwarf_macro_record_type) read_1_byte (abfd, mac_ptr);
24148 /* Note that we rely on the fact that the corresponding GNU and
24149 DWARF constants are the same. */
24151 DIAGNOSTIC_IGNORE_SWITCH_DIFFERENT_ENUM_TYPES
24152 switch (macinfo_type)
24154 /* A zero macinfo type indicates the end of the macro
24159 case DW_MACRO_define:
24160 case DW_MACRO_undef:
24161 case DW_MACRO_define_strp:
24162 case DW_MACRO_undef_strp:
24163 case DW_MACRO_define_sup:
24164 case DW_MACRO_undef_sup:
24166 unsigned int bytes_read;
24171 line = read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
24172 mac_ptr += bytes_read;
24174 if (macinfo_type == DW_MACRO_define
24175 || macinfo_type == DW_MACRO_undef)
24177 body = read_direct_string (abfd, mac_ptr, &bytes_read);
24178 mac_ptr += bytes_read;
24182 LONGEST str_offset;
24184 str_offset = read_offset_1 (abfd, mac_ptr, offset_size);
24185 mac_ptr += offset_size;
24187 if (macinfo_type == DW_MACRO_define_sup
24188 || macinfo_type == DW_MACRO_undef_sup
24191 struct dwz_file *dwz
24192 = dwarf2_get_dwz_file (dwarf2_per_objfile);
24194 body = read_indirect_string_from_dwz (objfile,
24198 body = read_indirect_string_at_offset (dwarf2_per_objfile,
24202 is_define = (macinfo_type == DW_MACRO_define
24203 || macinfo_type == DW_MACRO_define_strp
24204 || macinfo_type == DW_MACRO_define_sup);
24205 if (! current_file)
24207 /* DWARF violation as no main source is present. */
24208 complaint (_("debug info with no main source gives macro %s "
24210 is_define ? _("definition") : _("undefinition"),
24214 if ((line == 0 && !at_commandline)
24215 || (line != 0 && at_commandline))
24216 complaint (_("debug info gives %s macro %s with %s line %d: %s"),
24217 at_commandline ? _("command-line") : _("in-file"),
24218 is_define ? _("definition") : _("undefinition"),
24219 line == 0 ? _("zero") : _("non-zero"), line, body);
24222 parse_macro_definition (current_file, line, body);
24225 gdb_assert (macinfo_type == DW_MACRO_undef
24226 || macinfo_type == DW_MACRO_undef_strp
24227 || macinfo_type == DW_MACRO_undef_sup);
24228 macro_undef (current_file, line, body);
24233 case DW_MACRO_start_file:
24235 unsigned int bytes_read;
24238 line = read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
24239 mac_ptr += bytes_read;
24240 file = read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
24241 mac_ptr += bytes_read;
24243 if ((line == 0 && !at_commandline)
24244 || (line != 0 && at_commandline))
24245 complaint (_("debug info gives source %d included "
24246 "from %s at %s line %d"),
24247 file, at_commandline ? _("command-line") : _("file"),
24248 line == 0 ? _("zero") : _("non-zero"), line);
24250 if (at_commandline)
24252 /* This DW_MACRO_start_file was executed in the
24254 at_commandline = 0;
24257 current_file = macro_start_file (file, line, current_file, lh);
24261 case DW_MACRO_end_file:
24262 if (! current_file)
24263 complaint (_("macro debug info has an unmatched "
24264 "`close_file' directive"));
24267 current_file = current_file->included_by;
24268 if (! current_file)
24270 enum dwarf_macro_record_type next_type;
24272 /* GCC circa March 2002 doesn't produce the zero
24273 type byte marking the end of the compilation
24274 unit. Complain if it's not there, but exit no
24277 /* Do we at least have room for a macinfo type byte? */
24278 if (mac_ptr >= mac_end)
24280 dwarf2_section_buffer_overflow_complaint (section);
24284 /* We don't increment mac_ptr here, so this is just
24287 = (enum dwarf_macro_record_type) read_1_byte (abfd,
24289 if (next_type != 0)
24290 complaint (_("no terminating 0-type entry for "
24291 "macros in `.debug_macinfo' section"));
24298 case DW_MACRO_import:
24299 case DW_MACRO_import_sup:
24303 bfd *include_bfd = abfd;
24304 struct dwarf2_section_info *include_section = section;
24305 const gdb_byte *include_mac_end = mac_end;
24306 int is_dwz = section_is_dwz;
24307 const gdb_byte *new_mac_ptr;
24309 offset = read_offset_1 (abfd, mac_ptr, offset_size);
24310 mac_ptr += offset_size;
24312 if (macinfo_type == DW_MACRO_import_sup)
24314 struct dwz_file *dwz = dwarf2_get_dwz_file (dwarf2_per_objfile);
24316 dwarf2_read_section (objfile, &dwz->macro);
24318 include_section = &dwz->macro;
24319 include_bfd = get_section_bfd_owner (include_section);
24320 include_mac_end = dwz->macro.buffer + dwz->macro.size;
24324 new_mac_ptr = include_section->buffer + offset;
24325 slot = htab_find_slot (include_hash, new_mac_ptr, INSERT);
24329 /* This has actually happened; see
24330 http://sourceware.org/bugzilla/show_bug.cgi?id=13568. */
24331 complaint (_("recursive DW_MACRO_import in "
24332 ".debug_macro section"));
24336 *slot = (void *) new_mac_ptr;
24338 dwarf_decode_macro_bytes (dwarf2_per_objfile,
24339 include_bfd, new_mac_ptr,
24340 include_mac_end, current_file, lh,
24341 section, section_is_gnu, is_dwz,
24342 offset_size, include_hash);
24344 htab_remove_elt (include_hash, (void *) new_mac_ptr);
24349 case DW_MACINFO_vendor_ext:
24350 if (!section_is_gnu)
24352 unsigned int bytes_read;
24354 /* This reads the constant, but since we don't recognize
24355 any vendor extensions, we ignore it. */
24356 read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
24357 mac_ptr += bytes_read;
24358 read_direct_string (abfd, mac_ptr, &bytes_read);
24359 mac_ptr += bytes_read;
24361 /* We don't recognize any vendor extensions. */
24367 mac_ptr = skip_unknown_opcode (macinfo_type, opcode_definitions,
24368 mac_ptr, mac_end, abfd, offset_size,
24370 if (mac_ptr == NULL)
24375 } while (macinfo_type != 0);
24379 dwarf_decode_macros (struct dwarf2_cu *cu, unsigned int offset,
24380 int section_is_gnu)
24382 struct dwarf2_per_objfile *dwarf2_per_objfile
24383 = cu->per_cu->dwarf2_per_objfile;
24384 struct objfile *objfile = dwarf2_per_objfile->objfile;
24385 struct line_header *lh = cu->line_header;
24387 const gdb_byte *mac_ptr, *mac_end;
24388 struct macro_source_file *current_file = 0;
24389 enum dwarf_macro_record_type macinfo_type;
24390 unsigned int offset_size = cu->header.offset_size;
24391 const gdb_byte *opcode_definitions[256];
24393 struct dwarf2_section_info *section;
24394 const char *section_name;
24396 if (cu->dwo_unit != NULL)
24398 if (section_is_gnu)
24400 section = &cu->dwo_unit->dwo_file->sections.macro;
24401 section_name = ".debug_macro.dwo";
24405 section = &cu->dwo_unit->dwo_file->sections.macinfo;
24406 section_name = ".debug_macinfo.dwo";
24411 if (section_is_gnu)
24413 section = &dwarf2_per_objfile->macro;
24414 section_name = ".debug_macro";
24418 section = &dwarf2_per_objfile->macinfo;
24419 section_name = ".debug_macinfo";
24423 dwarf2_read_section (objfile, section);
24424 if (section->buffer == NULL)
24426 complaint (_("missing %s section"), section_name);
24429 abfd = get_section_bfd_owner (section);
24431 /* First pass: Find the name of the base filename.
24432 This filename is needed in order to process all macros whose definition
24433 (or undefinition) comes from the command line. These macros are defined
24434 before the first DW_MACINFO_start_file entry, and yet still need to be
24435 associated to the base file.
24437 To determine the base file name, we scan the macro definitions until we
24438 reach the first DW_MACINFO_start_file entry. We then initialize
24439 CURRENT_FILE accordingly so that any macro definition found before the
24440 first DW_MACINFO_start_file can still be associated to the base file. */
24442 mac_ptr = section->buffer + offset;
24443 mac_end = section->buffer + section->size;
24445 mac_ptr = dwarf_parse_macro_header (opcode_definitions, abfd, mac_ptr,
24446 &offset_size, section_is_gnu);
24447 if (mac_ptr == NULL)
24449 /* We already issued a complaint. */
24455 /* Do we at least have room for a macinfo type byte? */
24456 if (mac_ptr >= mac_end)
24458 /* Complaint is printed during the second pass as GDB will probably
24459 stop the first pass earlier upon finding
24460 DW_MACINFO_start_file. */
24464 macinfo_type = (enum dwarf_macro_record_type) read_1_byte (abfd, mac_ptr);
24467 /* Note that we rely on the fact that the corresponding GNU and
24468 DWARF constants are the same. */
24470 DIAGNOSTIC_IGNORE_SWITCH_DIFFERENT_ENUM_TYPES
24471 switch (macinfo_type)
24473 /* A zero macinfo type indicates the end of the macro
24478 case DW_MACRO_define:
24479 case DW_MACRO_undef:
24480 /* Only skip the data by MAC_PTR. */
24482 unsigned int bytes_read;
24484 read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
24485 mac_ptr += bytes_read;
24486 read_direct_string (abfd, mac_ptr, &bytes_read);
24487 mac_ptr += bytes_read;
24491 case DW_MACRO_start_file:
24493 unsigned int bytes_read;
24496 line = read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
24497 mac_ptr += bytes_read;
24498 file = read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
24499 mac_ptr += bytes_read;
24501 current_file = macro_start_file (file, line, current_file, lh);
24505 case DW_MACRO_end_file:
24506 /* No data to skip by MAC_PTR. */
24509 case DW_MACRO_define_strp:
24510 case DW_MACRO_undef_strp:
24511 case DW_MACRO_define_sup:
24512 case DW_MACRO_undef_sup:
24514 unsigned int bytes_read;
24516 read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
24517 mac_ptr += bytes_read;
24518 mac_ptr += offset_size;
24522 case DW_MACRO_import:
24523 case DW_MACRO_import_sup:
24524 /* Note that, according to the spec, a transparent include
24525 chain cannot call DW_MACRO_start_file. So, we can just
24526 skip this opcode. */
24527 mac_ptr += offset_size;
24530 case DW_MACINFO_vendor_ext:
24531 /* Only skip the data by MAC_PTR. */
24532 if (!section_is_gnu)
24534 unsigned int bytes_read;
24536 read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
24537 mac_ptr += bytes_read;
24538 read_direct_string (abfd, mac_ptr, &bytes_read);
24539 mac_ptr += bytes_read;
24544 mac_ptr = skip_unknown_opcode (macinfo_type, opcode_definitions,
24545 mac_ptr, mac_end, abfd, offset_size,
24547 if (mac_ptr == NULL)
24552 } while (macinfo_type != 0 && current_file == NULL);
24554 /* Second pass: Process all entries.
24556 Use the AT_COMMAND_LINE flag to determine whether we are still processing
24557 command-line macro definitions/undefinitions. This flag is unset when we
24558 reach the first DW_MACINFO_start_file entry. */
24560 htab_up include_hash (htab_create_alloc (1, htab_hash_pointer,
24562 NULL, xcalloc, xfree));
24563 mac_ptr = section->buffer + offset;
24564 slot = htab_find_slot (include_hash.get (), mac_ptr, INSERT);
24565 *slot = (void *) mac_ptr;
24566 dwarf_decode_macro_bytes (dwarf2_per_objfile,
24567 abfd, mac_ptr, mac_end,
24568 current_file, lh, section,
24569 section_is_gnu, 0, offset_size,
24570 include_hash.get ());
24573 /* Check if the attribute's form is a DW_FORM_block*
24574 if so return true else false. */
24577 attr_form_is_block (const struct attribute *attr)
24579 return (attr == NULL ? 0 :
24580 attr->form == DW_FORM_block1
24581 || attr->form == DW_FORM_block2
24582 || attr->form == DW_FORM_block4
24583 || attr->form == DW_FORM_block
24584 || attr->form == DW_FORM_exprloc);
24587 /* Return non-zero if ATTR's value is a section offset --- classes
24588 lineptr, loclistptr, macptr or rangelistptr --- or zero, otherwise.
24589 You may use DW_UNSND (attr) to retrieve such offsets.
24591 Section 7.5.4, "Attribute Encodings", explains that no attribute
24592 may have a value that belongs to more than one of these classes; it
24593 would be ambiguous if we did, because we use the same forms for all
24597 attr_form_is_section_offset (const struct attribute *attr)
24599 return (attr->form == DW_FORM_data4
24600 || attr->form == DW_FORM_data8
24601 || attr->form == DW_FORM_sec_offset);
24604 /* Return non-zero if ATTR's value falls in the 'constant' class, or
24605 zero otherwise. When this function returns true, you can apply
24606 dwarf2_get_attr_constant_value to it.
24608 However, note that for some attributes you must check
24609 attr_form_is_section_offset before using this test. DW_FORM_data4
24610 and DW_FORM_data8 are members of both the constant class, and of
24611 the classes that contain offsets into other debug sections
24612 (lineptr, loclistptr, macptr or rangelistptr). The DWARF spec says
24613 that, if an attribute's can be either a constant or one of the
24614 section offset classes, DW_FORM_data4 and DW_FORM_data8 should be
24615 taken as section offsets, not constants.
24617 DW_FORM_data16 is not considered as dwarf2_get_attr_constant_value
24618 cannot handle that. */
24621 attr_form_is_constant (const struct attribute *attr)
24623 switch (attr->form)
24625 case DW_FORM_sdata:
24626 case DW_FORM_udata:
24627 case DW_FORM_data1:
24628 case DW_FORM_data2:
24629 case DW_FORM_data4:
24630 case DW_FORM_data8:
24631 case DW_FORM_implicit_const:
24639 /* DW_ADDR is always stored already as sect_offset; despite for the forms
24640 besides DW_FORM_ref_addr it is stored as cu_offset in the DWARF file. */
24643 attr_form_is_ref (const struct attribute *attr)
24645 switch (attr->form)
24647 case DW_FORM_ref_addr:
24652 case DW_FORM_ref_udata:
24653 case DW_FORM_GNU_ref_alt:
24660 /* Return the .debug_loc section to use for CU.
24661 For DWO files use .debug_loc.dwo. */
24663 static struct dwarf2_section_info *
24664 cu_debug_loc_section (struct dwarf2_cu *cu)
24666 struct dwarf2_per_objfile *dwarf2_per_objfile
24667 = cu->per_cu->dwarf2_per_objfile;
24671 struct dwo_sections *sections = &cu->dwo_unit->dwo_file->sections;
24673 return cu->header.version >= 5 ? §ions->loclists : §ions->loc;
24675 return (cu->header.version >= 5 ? &dwarf2_per_objfile->loclists
24676 : &dwarf2_per_objfile->loc);
24679 /* A helper function that fills in a dwarf2_loclist_baton. */
24682 fill_in_loclist_baton (struct dwarf2_cu *cu,
24683 struct dwarf2_loclist_baton *baton,
24684 const struct attribute *attr)
24686 struct dwarf2_per_objfile *dwarf2_per_objfile
24687 = cu->per_cu->dwarf2_per_objfile;
24688 struct dwarf2_section_info *section = cu_debug_loc_section (cu);
24690 dwarf2_read_section (dwarf2_per_objfile->objfile, section);
24692 baton->per_cu = cu->per_cu;
24693 gdb_assert (baton->per_cu);
24694 /* We don't know how long the location list is, but make sure we
24695 don't run off the edge of the section. */
24696 baton->size = section->size - DW_UNSND (attr);
24697 baton->data = section->buffer + DW_UNSND (attr);
24698 baton->base_address = cu->base_address;
24699 baton->from_dwo = cu->dwo_unit != NULL;
24703 dwarf2_symbol_mark_computed (const struct attribute *attr, struct symbol *sym,
24704 struct dwarf2_cu *cu, int is_block)
24706 struct dwarf2_per_objfile *dwarf2_per_objfile
24707 = cu->per_cu->dwarf2_per_objfile;
24708 struct objfile *objfile = dwarf2_per_objfile->objfile;
24709 struct dwarf2_section_info *section = cu_debug_loc_section (cu);
24711 if (attr_form_is_section_offset (attr)
24712 /* .debug_loc{,.dwo} may not exist at all, or the offset may be outside
24713 the section. If so, fall through to the complaint in the
24715 && DW_UNSND (attr) < dwarf2_section_size (objfile, section))
24717 struct dwarf2_loclist_baton *baton;
24719 baton = XOBNEW (&objfile->objfile_obstack, struct dwarf2_loclist_baton);
24721 fill_in_loclist_baton (cu, baton, attr);
24723 if (cu->base_known == 0)
24724 complaint (_("Location list used without "
24725 "specifying the CU base address."));
24727 SYMBOL_ACLASS_INDEX (sym) = (is_block
24728 ? dwarf2_loclist_block_index
24729 : dwarf2_loclist_index);
24730 SYMBOL_LOCATION_BATON (sym) = baton;
24734 struct dwarf2_locexpr_baton *baton;
24736 baton = XOBNEW (&objfile->objfile_obstack, struct dwarf2_locexpr_baton);
24737 baton->per_cu = cu->per_cu;
24738 gdb_assert (baton->per_cu);
24740 if (attr_form_is_block (attr))
24742 /* Note that we're just copying the block's data pointer
24743 here, not the actual data. We're still pointing into the
24744 info_buffer for SYM's objfile; right now we never release
24745 that buffer, but when we do clean up properly this may
24747 baton->size = DW_BLOCK (attr)->size;
24748 baton->data = DW_BLOCK (attr)->data;
24752 dwarf2_invalid_attrib_class_complaint ("location description",
24753 SYMBOL_NATURAL_NAME (sym));
24757 SYMBOL_ACLASS_INDEX (sym) = (is_block
24758 ? dwarf2_locexpr_block_index
24759 : dwarf2_locexpr_index);
24760 SYMBOL_LOCATION_BATON (sym) = baton;
24764 /* Return the OBJFILE associated with the compilation unit CU. If CU
24765 came from a separate debuginfo file, then the master objfile is
24769 dwarf2_per_cu_objfile (struct dwarf2_per_cu_data *per_cu)
24771 struct objfile *objfile = per_cu->dwarf2_per_objfile->objfile;
24773 /* Return the master objfile, so that we can report and look up the
24774 correct file containing this variable. */
24775 if (objfile->separate_debug_objfile_backlink)
24776 objfile = objfile->separate_debug_objfile_backlink;
24781 /* Return comp_unit_head for PER_CU, either already available in PER_CU->CU
24782 (CU_HEADERP is unused in such case) or prepare a temporary copy at
24783 CU_HEADERP first. */
24785 static const struct comp_unit_head *
24786 per_cu_header_read_in (struct comp_unit_head *cu_headerp,
24787 struct dwarf2_per_cu_data *per_cu)
24789 const gdb_byte *info_ptr;
24792 return &per_cu->cu->header;
24794 info_ptr = per_cu->section->buffer + to_underlying (per_cu->sect_off);
24796 memset (cu_headerp, 0, sizeof (*cu_headerp));
24797 read_comp_unit_head (cu_headerp, info_ptr, per_cu->section,
24798 rcuh_kind::COMPILE);
24803 /* Return the address size given in the compilation unit header for CU. */
24806 dwarf2_per_cu_addr_size (struct dwarf2_per_cu_data *per_cu)
24808 struct comp_unit_head cu_header_local;
24809 const struct comp_unit_head *cu_headerp;
24811 cu_headerp = per_cu_header_read_in (&cu_header_local, per_cu);
24813 return cu_headerp->addr_size;
24816 /* Return the offset size given in the compilation unit header for CU. */
24819 dwarf2_per_cu_offset_size (struct dwarf2_per_cu_data *per_cu)
24821 struct comp_unit_head cu_header_local;
24822 const struct comp_unit_head *cu_headerp;
24824 cu_headerp = per_cu_header_read_in (&cu_header_local, per_cu);
24826 return cu_headerp->offset_size;
24829 /* See its dwarf2loc.h declaration. */
24832 dwarf2_per_cu_ref_addr_size (struct dwarf2_per_cu_data *per_cu)
24834 struct comp_unit_head cu_header_local;
24835 const struct comp_unit_head *cu_headerp;
24837 cu_headerp = per_cu_header_read_in (&cu_header_local, per_cu);
24839 if (cu_headerp->version == 2)
24840 return cu_headerp->addr_size;
24842 return cu_headerp->offset_size;
24845 /* Return the text offset of the CU. The returned offset comes from
24846 this CU's objfile. If this objfile came from a separate debuginfo
24847 file, then the offset may be different from the corresponding
24848 offset in the parent objfile. */
24851 dwarf2_per_cu_text_offset (struct dwarf2_per_cu_data *per_cu)
24853 struct objfile *objfile = per_cu->dwarf2_per_objfile->objfile;
24855 return ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
24858 /* Return DWARF version number of PER_CU. */
24861 dwarf2_version (struct dwarf2_per_cu_data *per_cu)
24863 return per_cu->dwarf_version;
24866 /* Locate the .debug_info compilation unit from CU's objfile which contains
24867 the DIE at OFFSET. Raises an error on failure. */
24869 static struct dwarf2_per_cu_data *
24870 dwarf2_find_containing_comp_unit (sect_offset sect_off,
24871 unsigned int offset_in_dwz,
24872 struct dwarf2_per_objfile *dwarf2_per_objfile)
24874 struct dwarf2_per_cu_data *this_cu;
24876 const sect_offset *cu_off;
24879 high = dwarf2_per_objfile->all_comp_units.size () - 1;
24882 struct dwarf2_per_cu_data *mid_cu;
24883 int mid = low + (high - low) / 2;
24885 mid_cu = dwarf2_per_objfile->all_comp_units[mid];
24886 cu_off = &mid_cu->sect_off;
24887 if (mid_cu->is_dwz > offset_in_dwz
24888 || (mid_cu->is_dwz == offset_in_dwz && *cu_off >= sect_off))
24893 gdb_assert (low == high);
24894 this_cu = dwarf2_per_objfile->all_comp_units[low];
24895 cu_off = &this_cu->sect_off;
24896 if (this_cu->is_dwz != offset_in_dwz || *cu_off > sect_off)
24898 if (low == 0 || this_cu->is_dwz != offset_in_dwz)
24899 error (_("Dwarf Error: could not find partial DIE containing "
24900 "offset %s [in module %s]"),
24901 sect_offset_str (sect_off),
24902 bfd_get_filename (dwarf2_per_objfile->objfile->obfd));
24904 gdb_assert (dwarf2_per_objfile->all_comp_units[low-1]->sect_off
24906 return dwarf2_per_objfile->all_comp_units[low-1];
24910 this_cu = dwarf2_per_objfile->all_comp_units[low];
24911 if (low == dwarf2_per_objfile->all_comp_units.size () - 1
24912 && sect_off >= this_cu->sect_off + this_cu->length)
24913 error (_("invalid dwarf2 offset %s"), sect_offset_str (sect_off));
24914 gdb_assert (sect_off < this_cu->sect_off + this_cu->length);
24919 /* Initialize dwarf2_cu CU, owned by PER_CU. */
24921 dwarf2_cu::dwarf2_cu (struct dwarf2_per_cu_data *per_cu_)
24922 : per_cu (per_cu_),
24925 checked_producer (0),
24926 producer_is_gxx_lt_4_6 (0),
24927 producer_is_gcc_lt_4_3 (0),
24928 producer_is_icc_lt_14 (0),
24929 processing_has_namespace_info (0)
24934 /* Destroy a dwarf2_cu. */
24936 dwarf2_cu::~dwarf2_cu ()
24941 /* Initialize basic fields of dwarf_cu CU according to DIE COMP_UNIT_DIE. */
24944 prepare_one_comp_unit (struct dwarf2_cu *cu, struct die_info *comp_unit_die,
24945 enum language pretend_language)
24947 struct attribute *attr;
24949 /* Set the language we're debugging. */
24950 attr = dwarf2_attr (comp_unit_die, DW_AT_language, cu);
24952 set_cu_language (DW_UNSND (attr), cu);
24955 cu->language = pretend_language;
24956 cu->language_defn = language_def (cu->language);
24959 cu->producer = dwarf2_string_attr (comp_unit_die, DW_AT_producer, cu);
24962 /* Increase the age counter on each cached compilation unit, and free
24963 any that are too old. */
24966 age_cached_comp_units (struct dwarf2_per_objfile *dwarf2_per_objfile)
24968 struct dwarf2_per_cu_data *per_cu, **last_chain;
24970 dwarf2_clear_marks (dwarf2_per_objfile->read_in_chain);
24971 per_cu = dwarf2_per_objfile->read_in_chain;
24972 while (per_cu != NULL)
24974 per_cu->cu->last_used ++;
24975 if (per_cu->cu->last_used <= dwarf_max_cache_age)
24976 dwarf2_mark (per_cu->cu);
24977 per_cu = per_cu->cu->read_in_chain;
24980 per_cu = dwarf2_per_objfile->read_in_chain;
24981 last_chain = &dwarf2_per_objfile->read_in_chain;
24982 while (per_cu != NULL)
24984 struct dwarf2_per_cu_data *next_cu;
24986 next_cu = per_cu->cu->read_in_chain;
24988 if (!per_cu->cu->mark)
24991 *last_chain = next_cu;
24994 last_chain = &per_cu->cu->read_in_chain;
25000 /* Remove a single compilation unit from the cache. */
25003 free_one_cached_comp_unit (struct dwarf2_per_cu_data *target_per_cu)
25005 struct dwarf2_per_cu_data *per_cu, **last_chain;
25006 struct dwarf2_per_objfile *dwarf2_per_objfile
25007 = target_per_cu->dwarf2_per_objfile;
25009 per_cu = dwarf2_per_objfile->read_in_chain;
25010 last_chain = &dwarf2_per_objfile->read_in_chain;
25011 while (per_cu != NULL)
25013 struct dwarf2_per_cu_data *next_cu;
25015 next_cu = per_cu->cu->read_in_chain;
25017 if (per_cu == target_per_cu)
25021 *last_chain = next_cu;
25025 last_chain = &per_cu->cu->read_in_chain;
25031 /* Cleanup function for the dwarf2_per_objfile data. */
25034 dwarf2_free_objfile (struct objfile *objfile, void *datum)
25036 struct dwarf2_per_objfile *dwarf2_per_objfile
25037 = static_cast<struct dwarf2_per_objfile *> (datum);
25039 delete dwarf2_per_objfile;
25042 /* A set of CU "per_cu" pointer, DIE offset, and GDB type pointer.
25043 We store these in a hash table separate from the DIEs, and preserve them
25044 when the DIEs are flushed out of cache.
25046 The CU "per_cu" pointer is needed because offset alone is not enough to
25047 uniquely identify the type. A file may have multiple .debug_types sections,
25048 or the type may come from a DWO file. Furthermore, while it's more logical
25049 to use per_cu->section+offset, with Fission the section with the data is in
25050 the DWO file but we don't know that section at the point we need it.
25051 We have to use something in dwarf2_per_cu_data (or the pointer to it)
25052 because we can enter the lookup routine, get_die_type_at_offset, from
25053 outside this file, and thus won't necessarily have PER_CU->cu.
25054 Fortunately, PER_CU is stable for the life of the objfile. */
25056 struct dwarf2_per_cu_offset_and_type
25058 const struct dwarf2_per_cu_data *per_cu;
25059 sect_offset sect_off;
25063 /* Hash function for a dwarf2_per_cu_offset_and_type. */
25066 per_cu_offset_and_type_hash (const void *item)
25068 const struct dwarf2_per_cu_offset_and_type *ofs
25069 = (const struct dwarf2_per_cu_offset_and_type *) item;
25071 return (uintptr_t) ofs->per_cu + to_underlying (ofs->sect_off);
25074 /* Equality function for a dwarf2_per_cu_offset_and_type. */
25077 per_cu_offset_and_type_eq (const void *item_lhs, const void *item_rhs)
25079 const struct dwarf2_per_cu_offset_and_type *ofs_lhs
25080 = (const struct dwarf2_per_cu_offset_and_type *) item_lhs;
25081 const struct dwarf2_per_cu_offset_and_type *ofs_rhs
25082 = (const struct dwarf2_per_cu_offset_and_type *) item_rhs;
25084 return (ofs_lhs->per_cu == ofs_rhs->per_cu
25085 && ofs_lhs->sect_off == ofs_rhs->sect_off);
25088 /* Set the type associated with DIE to TYPE. Save it in CU's hash
25089 table if necessary. For convenience, return TYPE.
25091 The DIEs reading must have careful ordering to:
25092 * Not cause infite loops trying to read in DIEs as a prerequisite for
25093 reading current DIE.
25094 * Not trying to dereference contents of still incompletely read in types
25095 while reading in other DIEs.
25096 * Enable referencing still incompletely read in types just by a pointer to
25097 the type without accessing its fields.
25099 Therefore caller should follow these rules:
25100 * Try to fetch any prerequisite types we may need to build this DIE type
25101 before building the type and calling set_die_type.
25102 * After building type call set_die_type for current DIE as soon as
25103 possible before fetching more types to complete the current type.
25104 * Make the type as complete as possible before fetching more types. */
25106 static struct type *
25107 set_die_type (struct die_info *die, struct type *type, struct dwarf2_cu *cu)
25109 struct dwarf2_per_objfile *dwarf2_per_objfile
25110 = cu->per_cu->dwarf2_per_objfile;
25111 struct dwarf2_per_cu_offset_and_type **slot, ofs;
25112 struct objfile *objfile = dwarf2_per_objfile->objfile;
25113 struct attribute *attr;
25114 struct dynamic_prop prop;
25116 /* For Ada types, make sure that the gnat-specific data is always
25117 initialized (if not already set). There are a few types where
25118 we should not be doing so, because the type-specific area is
25119 already used to hold some other piece of info (eg: TYPE_CODE_FLT
25120 where the type-specific area is used to store the floatformat).
25121 But this is not a problem, because the gnat-specific information
25122 is actually not needed for these types. */
25123 if (need_gnat_info (cu)
25124 && TYPE_CODE (type) != TYPE_CODE_FUNC
25125 && TYPE_CODE (type) != TYPE_CODE_FLT
25126 && TYPE_CODE (type) != TYPE_CODE_METHODPTR
25127 && TYPE_CODE (type) != TYPE_CODE_MEMBERPTR
25128 && TYPE_CODE (type) != TYPE_CODE_METHOD
25129 && !HAVE_GNAT_AUX_INFO (type))
25130 INIT_GNAT_SPECIFIC (type);
25132 /* Read DW_AT_allocated and set in type. */
25133 attr = dwarf2_attr (die, DW_AT_allocated, cu);
25134 if (attr_form_is_block (attr))
25136 if (attr_to_dynamic_prop (attr, die, cu, &prop))
25137 add_dyn_prop (DYN_PROP_ALLOCATED, prop, type);
25139 else if (attr != NULL)
25141 complaint (_("DW_AT_allocated has the wrong form (%s) at DIE %s"),
25142 (attr != NULL ? dwarf_form_name (attr->form) : "n/a"),
25143 sect_offset_str (die->sect_off));
25146 /* Read DW_AT_associated and set in type. */
25147 attr = dwarf2_attr (die, DW_AT_associated, cu);
25148 if (attr_form_is_block (attr))
25150 if (attr_to_dynamic_prop (attr, die, cu, &prop))
25151 add_dyn_prop (DYN_PROP_ASSOCIATED, prop, type);
25153 else if (attr != NULL)
25155 complaint (_("DW_AT_associated 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_data_location and set in type. */
25161 attr = dwarf2_attr (die, DW_AT_data_location, cu);
25162 if (attr_to_dynamic_prop (attr, die, cu, &prop))
25163 add_dyn_prop (DYN_PROP_DATA_LOCATION, prop, type);
25165 if (dwarf2_per_objfile->die_type_hash == NULL)
25167 dwarf2_per_objfile->die_type_hash =
25168 htab_create_alloc_ex (127,
25169 per_cu_offset_and_type_hash,
25170 per_cu_offset_and_type_eq,
25172 &objfile->objfile_obstack,
25173 hashtab_obstack_allocate,
25174 dummy_obstack_deallocate);
25177 ofs.per_cu = cu->per_cu;
25178 ofs.sect_off = die->sect_off;
25180 slot = (struct dwarf2_per_cu_offset_and_type **)
25181 htab_find_slot (dwarf2_per_objfile->die_type_hash, &ofs, INSERT);
25183 complaint (_("A problem internal to GDB: DIE %s has type already set"),
25184 sect_offset_str (die->sect_off));
25185 *slot = XOBNEW (&objfile->objfile_obstack,
25186 struct dwarf2_per_cu_offset_and_type);
25191 /* Look up the type for the die at SECT_OFF in PER_CU in die_type_hash,
25192 or return NULL if the die does not have a saved type. */
25194 static struct type *
25195 get_die_type_at_offset (sect_offset sect_off,
25196 struct dwarf2_per_cu_data *per_cu)
25198 struct dwarf2_per_cu_offset_and_type *slot, ofs;
25199 struct dwarf2_per_objfile *dwarf2_per_objfile = per_cu->dwarf2_per_objfile;
25201 if (dwarf2_per_objfile->die_type_hash == NULL)
25204 ofs.per_cu = per_cu;
25205 ofs.sect_off = sect_off;
25206 slot = ((struct dwarf2_per_cu_offset_and_type *)
25207 htab_find (dwarf2_per_objfile->die_type_hash, &ofs));
25214 /* Look up the type for DIE in CU in die_type_hash,
25215 or return NULL if DIE does not have a saved type. */
25217 static struct type *
25218 get_die_type (struct die_info *die, struct dwarf2_cu *cu)
25220 return get_die_type_at_offset (die->sect_off, cu->per_cu);
25223 /* Add a dependence relationship from CU to REF_PER_CU. */
25226 dwarf2_add_dependence (struct dwarf2_cu *cu,
25227 struct dwarf2_per_cu_data *ref_per_cu)
25231 if (cu->dependencies == NULL)
25233 = htab_create_alloc_ex (5, htab_hash_pointer, htab_eq_pointer,
25234 NULL, &cu->comp_unit_obstack,
25235 hashtab_obstack_allocate,
25236 dummy_obstack_deallocate);
25238 slot = htab_find_slot (cu->dependencies, ref_per_cu, INSERT);
25240 *slot = ref_per_cu;
25243 /* Subroutine of dwarf2_mark to pass to htab_traverse.
25244 Set the mark field in every compilation unit in the
25245 cache that we must keep because we are keeping CU. */
25248 dwarf2_mark_helper (void **slot, void *data)
25250 struct dwarf2_per_cu_data *per_cu;
25252 per_cu = (struct dwarf2_per_cu_data *) *slot;
25254 /* cu->dependencies references may not yet have been ever read if QUIT aborts
25255 reading of the chain. As such dependencies remain valid it is not much
25256 useful to track and undo them during QUIT cleanups. */
25257 if (per_cu->cu == NULL)
25260 if (per_cu->cu->mark)
25262 per_cu->cu->mark = 1;
25264 if (per_cu->cu->dependencies != NULL)
25265 htab_traverse (per_cu->cu->dependencies, dwarf2_mark_helper, NULL);
25270 /* Set the mark field in CU and in every other compilation unit in the
25271 cache that we must keep because we are keeping CU. */
25274 dwarf2_mark (struct dwarf2_cu *cu)
25279 if (cu->dependencies != NULL)
25280 htab_traverse (cu->dependencies, dwarf2_mark_helper, NULL);
25284 dwarf2_clear_marks (struct dwarf2_per_cu_data *per_cu)
25288 per_cu->cu->mark = 0;
25289 per_cu = per_cu->cu->read_in_chain;
25293 /* Trivial hash function for partial_die_info: the hash value of a DIE
25294 is its offset in .debug_info for this objfile. */
25297 partial_die_hash (const void *item)
25299 const struct partial_die_info *part_die
25300 = (const struct partial_die_info *) item;
25302 return to_underlying (part_die->sect_off);
25305 /* Trivial comparison function for partial_die_info structures: two DIEs
25306 are equal if they have the same offset. */
25309 partial_die_eq (const void *item_lhs, const void *item_rhs)
25311 const struct partial_die_info *part_die_lhs
25312 = (const struct partial_die_info *) item_lhs;
25313 const struct partial_die_info *part_die_rhs
25314 = (const struct partial_die_info *) item_rhs;
25316 return part_die_lhs->sect_off == part_die_rhs->sect_off;
25319 static struct cmd_list_element *set_dwarf_cmdlist;
25320 static struct cmd_list_element *show_dwarf_cmdlist;
25323 set_dwarf_cmd (const char *args, int from_tty)
25325 help_list (set_dwarf_cmdlist, "maintenance set dwarf ", all_commands,
25330 show_dwarf_cmd (const char *args, int from_tty)
25332 cmd_show_list (show_dwarf_cmdlist, from_tty, "");
25335 int dwarf_always_disassemble;
25338 show_dwarf_always_disassemble (struct ui_file *file, int from_tty,
25339 struct cmd_list_element *c, const char *value)
25341 fprintf_filtered (file,
25342 _("Whether to always disassemble "
25343 "DWARF expressions is %s.\n"),
25348 show_check_physname (struct ui_file *file, int from_tty,
25349 struct cmd_list_element *c, const char *value)
25351 fprintf_filtered (file,
25352 _("Whether to check \"physname\" is %s.\n"),
25357 _initialize_dwarf2_read (void)
25359 dwarf2_objfile_data_key
25360 = register_objfile_data_with_cleanup (nullptr, dwarf2_free_objfile);
25362 add_prefix_cmd ("dwarf", class_maintenance, set_dwarf_cmd, _("\
25363 Set DWARF specific variables.\n\
25364 Configure DWARF variables such as the cache size"),
25365 &set_dwarf_cmdlist, "maintenance set dwarf ",
25366 0/*allow-unknown*/, &maintenance_set_cmdlist);
25368 add_prefix_cmd ("dwarf", class_maintenance, show_dwarf_cmd, _("\
25369 Show DWARF specific variables\n\
25370 Show DWARF variables such as the cache size"),
25371 &show_dwarf_cmdlist, "maintenance show dwarf ",
25372 0/*allow-unknown*/, &maintenance_show_cmdlist);
25374 add_setshow_zinteger_cmd ("max-cache-age", class_obscure,
25375 &dwarf_max_cache_age, _("\
25376 Set the upper bound on the age of cached DWARF compilation units."), _("\
25377 Show the upper bound on the age of cached DWARF compilation units."), _("\
25378 A higher limit means that cached compilation units will be stored\n\
25379 in memory longer, and more total memory will be used. Zero disables\n\
25380 caching, which can slow down startup."),
25382 show_dwarf_max_cache_age,
25383 &set_dwarf_cmdlist,
25384 &show_dwarf_cmdlist);
25386 add_setshow_boolean_cmd ("always-disassemble", class_obscure,
25387 &dwarf_always_disassemble, _("\
25388 Set whether `info address' always disassembles DWARF expressions."), _("\
25389 Show whether `info address' always disassembles DWARF expressions."), _("\
25390 When enabled, DWARF expressions are always printed in an assembly-like\n\
25391 syntax. When disabled, expressions will be printed in a more\n\
25392 conversational style, when possible."),
25394 show_dwarf_always_disassemble,
25395 &set_dwarf_cmdlist,
25396 &show_dwarf_cmdlist);
25398 add_setshow_zuinteger_cmd ("dwarf-read", no_class, &dwarf_read_debug, _("\
25399 Set debugging of the DWARF reader."), _("\
25400 Show debugging of the DWARF reader."), _("\
25401 When enabled (non-zero), debugging messages are printed during DWARF\n\
25402 reading and symtab expansion. A value of 1 (one) provides basic\n\
25403 information. A value greater than 1 provides more verbose information."),
25406 &setdebuglist, &showdebuglist);
25408 add_setshow_zuinteger_cmd ("dwarf-die", no_class, &dwarf_die_debug, _("\
25409 Set debugging of the DWARF DIE reader."), _("\
25410 Show debugging of the DWARF DIE reader."), _("\
25411 When enabled (non-zero), DIEs are dumped after they are read in.\n\
25412 The value is the maximum depth to print."),
25415 &setdebuglist, &showdebuglist);
25417 add_setshow_zuinteger_cmd ("dwarf-line", no_class, &dwarf_line_debug, _("\
25418 Set debugging of the dwarf line reader."), _("\
25419 Show debugging of the dwarf line reader."), _("\
25420 When enabled (non-zero), line number entries are dumped as they are read in.\n\
25421 A value of 1 (one) provides basic information.\n\
25422 A value greater than 1 provides more verbose information."),
25425 &setdebuglist, &showdebuglist);
25427 add_setshow_boolean_cmd ("check-physname", no_class, &check_physname, _("\
25428 Set cross-checking of \"physname\" code against demangler."), _("\
25429 Show cross-checking of \"physname\" code against demangler."), _("\
25430 When enabled, GDB's internal \"physname\" code is checked against\n\
25432 NULL, show_check_physname,
25433 &setdebuglist, &showdebuglist);
25435 add_setshow_boolean_cmd ("use-deprecated-index-sections",
25436 no_class, &use_deprecated_index_sections, _("\
25437 Set whether to use deprecated gdb_index sections."), _("\
25438 Show whether to use deprecated gdb_index sections."), _("\
25439 When enabled, deprecated .gdb_index sections are used anyway.\n\
25440 Normally they are ignored either because of a missing feature or\n\
25441 performance issue.\n\
25442 Warning: This option must be enabled before gdb reads the file."),
25445 &setlist, &showlist);
25447 dwarf2_locexpr_index = register_symbol_computed_impl (LOC_COMPUTED,
25448 &dwarf2_locexpr_funcs);
25449 dwarf2_loclist_index = register_symbol_computed_impl (LOC_COMPUTED,
25450 &dwarf2_loclist_funcs);
25452 dwarf2_locexpr_block_index = register_symbol_block_impl (LOC_BLOCK,
25453 &dwarf2_block_frame_base_locexpr_funcs);
25454 dwarf2_loclist_block_index = register_symbol_block_impl (LOC_BLOCK,
25455 &dwarf2_block_frame_base_loclist_funcs);
25458 selftests::register_test ("dw2_expand_symtabs_matching",
25459 selftests::dw2_expand_symtabs_matching::run_test);