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 /* The name_component table (a sorted vector). See name_component's
151 description above. */
152 std::vector<name_component> name_components;
154 /* How NAME_COMPONENTS is sorted. */
155 enum case_sensitivity name_components_casing;
157 /* Return the number of names in the symbol table. */
158 virtual size_t symbol_name_count () const = 0;
160 /* Get the name of the symbol at IDX in the symbol table. */
161 virtual const char *symbol_name_at (offset_type idx) const = 0;
163 /* Return whether the name at IDX in the symbol table should be
165 virtual bool symbol_name_slot_invalid (offset_type idx) const
170 /* Build the symbol name component sorted vector, if we haven't
172 void build_name_components ();
174 /* Returns the lower (inclusive) and upper (exclusive) bounds of the
175 possible matches for LN_NO_PARAMS in the name component
177 std::pair<std::vector<name_component>::const_iterator,
178 std::vector<name_component>::const_iterator>
179 find_name_components_bounds (const lookup_name_info &ln_no_params) const;
181 /* Prevent deleting/destroying via a base class pointer. */
183 ~mapped_index_base() = default;
186 /* A description of the mapped index. The file format is described in
187 a comment by the code that writes the index. */
188 struct mapped_index final : public mapped_index_base
190 /* A slot/bucket in the symbol table hash. */
191 struct symbol_table_slot
193 const offset_type name;
194 const offset_type vec;
197 /* Index data format version. */
200 /* The total length of the buffer. */
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;
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 /* Name of the file. */
816 /* File format version. */
822 /* Section info for this file. */
823 struct dwp_sections sections;
825 /* Table of CUs in the file. */
826 const struct dwp_hash_table *cus;
828 /* Table of TUs in the file. */
829 const struct dwp_hash_table *tus;
831 /* Tables of loaded CUs/TUs. Each entry is a struct dwo_unit *. */
835 /* Table to map ELF section numbers to their sections.
836 This is only needed for the DWP V1 file format. */
837 unsigned int num_sections;
838 asection **elf_sections;
841 /* This represents a '.dwz' file. */
845 /* A dwz file can only contain a few sections. */
846 struct dwarf2_section_info abbrev;
847 struct dwarf2_section_info info;
848 struct dwarf2_section_info str;
849 struct dwarf2_section_info line;
850 struct dwarf2_section_info macro;
851 struct dwarf2_section_info gdb_index;
852 struct dwarf2_section_info debug_names;
858 /* Struct used to pass misc. parameters to read_die_and_children, et
859 al. which are used for both .debug_info and .debug_types dies.
860 All parameters here are unchanging for the life of the call. This
861 struct exists to abstract away the constant parameters of die reading. */
863 struct die_reader_specs
865 /* The bfd of die_section. */
868 /* The CU of the DIE we are parsing. */
869 struct dwarf2_cu *cu;
871 /* Non-NULL if reading a DWO file (including one packaged into a DWP). */
872 struct dwo_file *dwo_file;
874 /* The section the die comes from.
875 This is either .debug_info or .debug_types, or the .dwo variants. */
876 struct dwarf2_section_info *die_section;
878 /* die_section->buffer. */
879 const gdb_byte *buffer;
881 /* The end of the buffer. */
882 const gdb_byte *buffer_end;
884 /* The value of the DW_AT_comp_dir attribute. */
885 const char *comp_dir;
887 /* The abbreviation table to use when reading the DIEs. */
888 struct abbrev_table *abbrev_table;
891 /* Type of function passed to init_cutu_and_read_dies, et.al. */
892 typedef void (die_reader_func_ftype) (const struct die_reader_specs *reader,
893 const gdb_byte *info_ptr,
894 struct die_info *comp_unit_die,
898 /* A 1-based directory index. This is a strong typedef to prevent
899 accidentally using a directory index as a 0-based index into an
901 enum class dir_index : unsigned int {};
903 /* Likewise, a 1-based file name index. */
904 enum class file_name_index : unsigned int {};
908 file_entry () = default;
910 file_entry (const char *name_, dir_index d_index_,
911 unsigned int mod_time_, unsigned int length_)
914 mod_time (mod_time_),
918 /* Return the include directory at D_INDEX stored in LH. Returns
919 NULL if D_INDEX is out of bounds. */
920 const char *include_dir (const line_header *lh) const;
922 /* The file name. Note this is an observing pointer. The memory is
923 owned by debug_line_buffer. */
926 /* The directory index (1-based). */
927 dir_index d_index {};
929 unsigned int mod_time {};
931 unsigned int length {};
933 /* True if referenced by the Line Number Program. */
936 /* The associated symbol table, if any. */
937 struct symtab *symtab {};
940 /* The line number information for a compilation unit (found in the
941 .debug_line section) begins with a "statement program header",
942 which contains the following information. */
949 /* Add an entry to the include directory table. */
950 void add_include_dir (const char *include_dir);
952 /* Add an entry to the file name table. */
953 void add_file_name (const char *name, dir_index d_index,
954 unsigned int mod_time, unsigned int length);
956 /* Return the include dir at INDEX (1-based). Returns NULL if INDEX
958 const char *include_dir_at (dir_index index) const
960 /* Convert directory index number (1-based) to vector index
962 size_t vec_index = to_underlying (index) - 1;
964 if (vec_index >= include_dirs.size ())
966 return include_dirs[vec_index];
969 /* Return the file name at INDEX (1-based). Returns NULL if INDEX
971 file_entry *file_name_at (file_name_index index)
973 /* Convert file name index number (1-based) to vector index
975 size_t vec_index = to_underlying (index) - 1;
977 if (vec_index >= file_names.size ())
979 return &file_names[vec_index];
982 /* Const version of the above. */
983 const file_entry *file_name_at (unsigned int index) const
985 if (index >= file_names.size ())
987 return &file_names[index];
990 /* Offset of line number information in .debug_line section. */
991 sect_offset sect_off {};
993 /* OFFSET is for struct dwz_file associated with dwarf2_per_objfile. */
994 unsigned offset_in_dwz : 1; /* Can't initialize bitfields in-class. */
996 unsigned int total_length {};
997 unsigned short version {};
998 unsigned int header_length {};
999 unsigned char minimum_instruction_length {};
1000 unsigned char maximum_ops_per_instruction {};
1001 unsigned char default_is_stmt {};
1003 unsigned char line_range {};
1004 unsigned char opcode_base {};
1006 /* standard_opcode_lengths[i] is the number of operands for the
1007 standard opcode whose value is i. This means that
1008 standard_opcode_lengths[0] is unused, and the last meaningful
1009 element is standard_opcode_lengths[opcode_base - 1]. */
1010 std::unique_ptr<unsigned char[]> standard_opcode_lengths;
1012 /* The include_directories table. Note these are observing
1013 pointers. The memory is owned by debug_line_buffer. */
1014 std::vector<const char *> include_dirs;
1016 /* The file_names table. */
1017 std::vector<file_entry> file_names;
1019 /* The start and end of the statement program following this
1020 header. These point into dwarf2_per_objfile->line_buffer. */
1021 const gdb_byte *statement_program_start {}, *statement_program_end {};
1024 typedef std::unique_ptr<line_header> line_header_up;
1027 file_entry::include_dir (const line_header *lh) const
1029 return lh->include_dir_at (d_index);
1032 /* When we construct a partial symbol table entry we only
1033 need this much information. */
1034 struct partial_die_info : public allocate_on_obstack
1036 partial_die_info (sect_offset sect_off, struct abbrev_info *abbrev);
1038 /* Disable assign but still keep copy ctor, which is needed
1039 load_partial_dies. */
1040 partial_die_info& operator=(const partial_die_info& rhs) = delete;
1042 /* Adjust the partial die before generating a symbol for it. This
1043 function may set the is_external flag or change the DIE's
1045 void fixup (struct dwarf2_cu *cu);
1047 /* Read a minimal amount of information into the minimal die
1049 const gdb_byte *read (const struct die_reader_specs *reader,
1050 const struct abbrev_info &abbrev,
1051 const gdb_byte *info_ptr);
1053 /* Offset of this DIE. */
1054 const sect_offset sect_off;
1056 /* DWARF-2 tag for this DIE. */
1057 const ENUM_BITFIELD(dwarf_tag) tag : 16;
1059 /* Assorted flags describing the data found in this DIE. */
1060 const unsigned int has_children : 1;
1062 unsigned int is_external : 1;
1063 unsigned int is_declaration : 1;
1064 unsigned int has_type : 1;
1065 unsigned int has_specification : 1;
1066 unsigned int has_pc_info : 1;
1067 unsigned int may_be_inlined : 1;
1069 /* This DIE has been marked DW_AT_main_subprogram. */
1070 unsigned int main_subprogram : 1;
1072 /* Flag set if the SCOPE field of this structure has been
1074 unsigned int scope_set : 1;
1076 /* Flag set if the DIE has a byte_size attribute. */
1077 unsigned int has_byte_size : 1;
1079 /* Flag set if the DIE has a DW_AT_const_value attribute. */
1080 unsigned int has_const_value : 1;
1082 /* Flag set if any of the DIE's children are template arguments. */
1083 unsigned int has_template_arguments : 1;
1085 /* Flag set if fixup has been called on this die. */
1086 unsigned int fixup_called : 1;
1088 /* Flag set if DW_TAG_imported_unit uses DW_FORM_GNU_ref_alt. */
1089 unsigned int is_dwz : 1;
1091 /* Flag set if spec_offset uses DW_FORM_GNU_ref_alt. */
1092 unsigned int spec_is_dwz : 1;
1094 /* The name of this DIE. Normally the value of DW_AT_name, but
1095 sometimes a default name for unnamed DIEs. */
1096 const char *name = nullptr;
1098 /* The linkage name, if present. */
1099 const char *linkage_name = nullptr;
1101 /* The scope to prepend to our children. This is generally
1102 allocated on the comp_unit_obstack, so will disappear
1103 when this compilation unit leaves the cache. */
1104 const char *scope = nullptr;
1106 /* Some data associated with the partial DIE. The tag determines
1107 which field is live. */
1110 /* The location description associated with this DIE, if any. */
1111 struct dwarf_block *locdesc;
1112 /* The offset of an import, for DW_TAG_imported_unit. */
1113 sect_offset sect_off;
1116 /* If HAS_PC_INFO, the PC range associated with this DIE. */
1117 CORE_ADDR lowpc = 0;
1118 CORE_ADDR highpc = 0;
1120 /* Pointer into the info_buffer (or types_buffer) pointing at the target of
1121 DW_AT_sibling, if any. */
1122 /* NOTE: This member isn't strictly necessary, partial_die_info::read
1123 could return DW_AT_sibling values to its caller load_partial_dies. */
1124 const gdb_byte *sibling = nullptr;
1126 /* If HAS_SPECIFICATION, the offset of the DIE referred to by
1127 DW_AT_specification (or DW_AT_abstract_origin or
1128 DW_AT_extension). */
1129 sect_offset spec_offset {};
1131 /* Pointers to this DIE's parent, first child, and next sibling,
1133 struct partial_die_info *die_parent = nullptr;
1134 struct partial_die_info *die_child = nullptr;
1135 struct partial_die_info *die_sibling = nullptr;
1137 friend struct partial_die_info *
1138 dwarf2_cu::find_partial_die (sect_offset sect_off);
1141 /* Only need to do look up in dwarf2_cu::find_partial_die. */
1142 partial_die_info (sect_offset sect_off)
1143 : partial_die_info (sect_off, DW_TAG_padding, 0)
1147 partial_die_info (sect_offset sect_off_, enum dwarf_tag tag_,
1149 : sect_off (sect_off_), tag (tag_), has_children (has_children_)
1154 has_specification = 0;
1157 main_subprogram = 0;
1160 has_const_value = 0;
1161 has_template_arguments = 0;
1168 /* This data structure holds the information of an abbrev. */
1171 unsigned int number; /* number identifying abbrev */
1172 enum dwarf_tag tag; /* dwarf tag */
1173 unsigned short has_children; /* boolean */
1174 unsigned short num_attrs; /* number of attributes */
1175 struct attr_abbrev *attrs; /* an array of attribute descriptions */
1176 struct abbrev_info *next; /* next in chain */
1181 ENUM_BITFIELD(dwarf_attribute) name : 16;
1182 ENUM_BITFIELD(dwarf_form) form : 16;
1184 /* It is valid only if FORM is DW_FORM_implicit_const. */
1185 LONGEST implicit_const;
1188 /* Size of abbrev_table.abbrev_hash_table. */
1189 #define ABBREV_HASH_SIZE 121
1191 /* Top level data structure to contain an abbreviation table. */
1195 explicit abbrev_table (sect_offset off)
1199 XOBNEWVEC (&abbrev_obstack, struct abbrev_info *, ABBREV_HASH_SIZE);
1200 memset (m_abbrevs, 0, ABBREV_HASH_SIZE * sizeof (struct abbrev_info *));
1203 DISABLE_COPY_AND_ASSIGN (abbrev_table);
1205 /* Allocate space for a struct abbrev_info object in
1207 struct abbrev_info *alloc_abbrev ();
1209 /* Add an abbreviation to the table. */
1210 void add_abbrev (unsigned int abbrev_number, struct abbrev_info *abbrev);
1212 /* Look up an abbrev in the table.
1213 Returns NULL if the abbrev is not found. */
1215 struct abbrev_info *lookup_abbrev (unsigned int abbrev_number);
1218 /* Where the abbrev table came from.
1219 This is used as a sanity check when the table is used. */
1220 const sect_offset sect_off;
1222 /* Storage for the abbrev table. */
1223 auto_obstack abbrev_obstack;
1227 /* Hash table of abbrevs.
1228 This is an array of size ABBREV_HASH_SIZE allocated in abbrev_obstack.
1229 It could be statically allocated, but the previous code didn't so we
1231 struct abbrev_info **m_abbrevs;
1234 typedef std::unique_ptr<struct abbrev_table> abbrev_table_up;
1236 /* Attributes have a name and a value. */
1239 ENUM_BITFIELD(dwarf_attribute) name : 16;
1240 ENUM_BITFIELD(dwarf_form) form : 15;
1242 /* Has DW_STRING already been updated by dwarf2_canonicalize_name? This
1243 field should be in u.str (existing only for DW_STRING) but it is kept
1244 here for better struct attribute alignment. */
1245 unsigned int string_is_canonical : 1;
1250 struct dwarf_block *blk;
1259 /* This data structure holds a complete die structure. */
1262 /* DWARF-2 tag for this DIE. */
1263 ENUM_BITFIELD(dwarf_tag) tag : 16;
1265 /* Number of attributes */
1266 unsigned char num_attrs;
1268 /* True if we're presently building the full type name for the
1269 type derived from this DIE. */
1270 unsigned char building_fullname : 1;
1272 /* True if this die is in process. PR 16581. */
1273 unsigned char in_process : 1;
1276 unsigned int abbrev;
1278 /* Offset in .debug_info or .debug_types section. */
1279 sect_offset sect_off;
1281 /* The dies in a compilation unit form an n-ary tree. PARENT
1282 points to this die's parent; CHILD points to the first child of
1283 this node; and all the children of a given node are chained
1284 together via their SIBLING fields. */
1285 struct die_info *child; /* Its first child, if any. */
1286 struct die_info *sibling; /* Its next sibling, if any. */
1287 struct die_info *parent; /* Its parent, if any. */
1289 /* An array of attributes, with NUM_ATTRS elements. There may be
1290 zero, but it's not common and zero-sized arrays are not
1291 sufficiently portable C. */
1292 struct attribute attrs[1];
1295 /* Get at parts of an attribute structure. */
1297 #define DW_STRING(attr) ((attr)->u.str)
1298 #define DW_STRING_IS_CANONICAL(attr) ((attr)->string_is_canonical)
1299 #define DW_UNSND(attr) ((attr)->u.unsnd)
1300 #define DW_BLOCK(attr) ((attr)->u.blk)
1301 #define DW_SND(attr) ((attr)->u.snd)
1302 #define DW_ADDR(attr) ((attr)->u.addr)
1303 #define DW_SIGNATURE(attr) ((attr)->u.signature)
1305 /* Blocks are a bunch of untyped bytes. */
1310 /* Valid only if SIZE is not zero. */
1311 const gdb_byte *data;
1314 #ifndef ATTR_ALLOC_CHUNK
1315 #define ATTR_ALLOC_CHUNK 4
1318 /* Allocate fields for structs, unions and enums in this size. */
1319 #ifndef DW_FIELD_ALLOC_CHUNK
1320 #define DW_FIELD_ALLOC_CHUNK 4
1323 /* FIXME: We might want to set this from BFD via bfd_arch_bits_per_byte,
1324 but this would require a corresponding change in unpack_field_as_long
1326 static int bits_per_byte = 8;
1328 /* When reading a variant or variant part, we track a bit more
1329 information about the field, and store it in an object of this
1332 struct variant_field
1334 /* If we see a DW_TAG_variant, then this will be the discriminant
1336 ULONGEST discriminant_value;
1337 /* If we see a DW_TAG_variant, then this will be set if this is the
1339 bool default_branch;
1340 /* While reading a DW_TAG_variant_part, this will be set if this
1341 field is the discriminant. */
1342 bool is_discriminant;
1347 int accessibility = 0;
1349 /* Extra information to describe a variant or variant part. */
1350 struct variant_field variant {};
1351 struct field field {};
1356 const char *name = nullptr;
1357 std::vector<struct fn_field> fnfields;
1360 /* The routines that read and process dies for a C struct or C++ class
1361 pass lists of data member fields and lists of member function fields
1362 in an instance of a field_info structure, as defined below. */
1365 /* List of data member and baseclasses fields. */
1366 std::vector<struct nextfield> fields;
1367 std::vector<struct nextfield> baseclasses;
1369 /* Number of fields (including baseclasses). */
1372 /* Set if the accesibility of one of the fields is not public. */
1373 int non_public_fields = 0;
1375 /* Member function fieldlist array, contains name of possibly overloaded
1376 member function, number of overloaded member functions and a pointer
1377 to the head of the member function field chain. */
1378 std::vector<struct fnfieldlist> fnfieldlists;
1380 /* typedefs defined inside this class. TYPEDEF_FIELD_LIST contains head of
1381 a NULL terminated list of TYPEDEF_FIELD_LIST_COUNT elements. */
1382 std::vector<struct decl_field> typedef_field_list;
1384 /* Nested types defined by this class and the number of elements in this
1386 std::vector<struct decl_field> nested_types_list;
1389 /* One item on the queue of compilation units to read in full symbols
1391 struct dwarf2_queue_item
1393 struct dwarf2_per_cu_data *per_cu;
1394 enum language pretend_language;
1395 struct dwarf2_queue_item *next;
1398 /* The current queue. */
1399 static struct dwarf2_queue_item *dwarf2_queue, *dwarf2_queue_tail;
1401 /* Loaded secondary compilation units are kept in memory until they
1402 have not been referenced for the processing of this many
1403 compilation units. Set this to zero to disable caching. Cache
1404 sizes of up to at least twenty will improve startup time for
1405 typical inter-CU-reference binaries, at an obvious memory cost. */
1406 static int dwarf_max_cache_age = 5;
1408 show_dwarf_max_cache_age (struct ui_file *file, int from_tty,
1409 struct cmd_list_element *c, const char *value)
1411 fprintf_filtered (file, _("The upper bound on the age of cached "
1412 "DWARF compilation units is %s.\n"),
1416 /* local function prototypes */
1418 static const char *get_section_name (const struct dwarf2_section_info *);
1420 static const char *get_section_file_name (const struct dwarf2_section_info *);
1422 static void dwarf2_find_base_address (struct die_info *die,
1423 struct dwarf2_cu *cu);
1425 static struct partial_symtab *create_partial_symtab
1426 (struct dwarf2_per_cu_data *per_cu, const char *name);
1428 static void build_type_psymtabs_reader (const struct die_reader_specs *reader,
1429 const gdb_byte *info_ptr,
1430 struct die_info *type_unit_die,
1431 int has_children, void *data);
1433 static void dwarf2_build_psymtabs_hard
1434 (struct dwarf2_per_objfile *dwarf2_per_objfile);
1436 static void scan_partial_symbols (struct partial_die_info *,
1437 CORE_ADDR *, CORE_ADDR *,
1438 int, struct dwarf2_cu *);
1440 static void add_partial_symbol (struct partial_die_info *,
1441 struct dwarf2_cu *);
1443 static void add_partial_namespace (struct partial_die_info *pdi,
1444 CORE_ADDR *lowpc, CORE_ADDR *highpc,
1445 int set_addrmap, struct dwarf2_cu *cu);
1447 static void add_partial_module (struct partial_die_info *pdi, CORE_ADDR *lowpc,
1448 CORE_ADDR *highpc, int set_addrmap,
1449 struct dwarf2_cu *cu);
1451 static void add_partial_enumeration (struct partial_die_info *enum_pdi,
1452 struct dwarf2_cu *cu);
1454 static void add_partial_subprogram (struct partial_die_info *pdi,
1455 CORE_ADDR *lowpc, CORE_ADDR *highpc,
1456 int need_pc, struct dwarf2_cu *cu);
1458 static void dwarf2_read_symtab (struct partial_symtab *,
1461 static void psymtab_to_symtab_1 (struct partial_symtab *);
1463 static abbrev_table_up abbrev_table_read_table
1464 (struct dwarf2_per_objfile *dwarf2_per_objfile, struct dwarf2_section_info *,
1467 static unsigned int peek_abbrev_code (bfd *, const gdb_byte *);
1469 static struct partial_die_info *load_partial_dies
1470 (const struct die_reader_specs *, const gdb_byte *, int);
1472 static struct partial_die_info *find_partial_die (sect_offset, int,
1473 struct dwarf2_cu *);
1475 static const gdb_byte *read_attribute (const struct die_reader_specs *,
1476 struct attribute *, struct attr_abbrev *,
1479 static unsigned int read_1_byte (bfd *, const gdb_byte *);
1481 static int read_1_signed_byte (bfd *, const gdb_byte *);
1483 static unsigned int read_2_bytes (bfd *, const gdb_byte *);
1485 static unsigned int read_4_bytes (bfd *, const gdb_byte *);
1487 static ULONGEST read_8_bytes (bfd *, const gdb_byte *);
1489 static CORE_ADDR read_address (bfd *, const gdb_byte *ptr, struct dwarf2_cu *,
1492 static LONGEST read_initial_length (bfd *, const gdb_byte *, unsigned int *);
1494 static LONGEST read_checked_initial_length_and_offset
1495 (bfd *, const gdb_byte *, const struct comp_unit_head *,
1496 unsigned int *, unsigned int *);
1498 static LONGEST read_offset (bfd *, const gdb_byte *,
1499 const struct comp_unit_head *,
1502 static LONGEST read_offset_1 (bfd *, const gdb_byte *, unsigned int);
1504 static sect_offset read_abbrev_offset
1505 (struct dwarf2_per_objfile *dwarf2_per_objfile,
1506 struct dwarf2_section_info *, sect_offset);
1508 static const gdb_byte *read_n_bytes (bfd *, const gdb_byte *, unsigned int);
1510 static const char *read_direct_string (bfd *, const gdb_byte *, unsigned int *);
1512 static const char *read_indirect_string
1513 (struct dwarf2_per_objfile *dwarf2_per_objfile, bfd *, const gdb_byte *,
1514 const struct comp_unit_head *, unsigned int *);
1516 static const char *read_indirect_line_string
1517 (struct dwarf2_per_objfile *dwarf2_per_objfile, bfd *, const gdb_byte *,
1518 const struct comp_unit_head *, unsigned int *);
1520 static const char *read_indirect_string_at_offset
1521 (struct dwarf2_per_objfile *dwarf2_per_objfile, bfd *abfd,
1522 LONGEST str_offset);
1524 static const char *read_indirect_string_from_dwz
1525 (struct objfile *objfile, struct dwz_file *, LONGEST);
1527 static LONGEST read_signed_leb128 (bfd *, const gdb_byte *, unsigned int *);
1529 static CORE_ADDR read_addr_index_from_leb128 (struct dwarf2_cu *,
1533 static const char *read_str_index (const struct die_reader_specs *reader,
1534 ULONGEST str_index);
1536 static void set_cu_language (unsigned int, struct dwarf2_cu *);
1538 static struct attribute *dwarf2_attr (struct die_info *, unsigned int,
1539 struct dwarf2_cu *);
1541 static struct attribute *dwarf2_attr_no_follow (struct die_info *,
1544 static const char *dwarf2_string_attr (struct die_info *die, unsigned int name,
1545 struct dwarf2_cu *cu);
1547 static int dwarf2_flag_true_p (struct die_info *die, unsigned name,
1548 struct dwarf2_cu *cu);
1550 static int die_is_declaration (struct die_info *, struct dwarf2_cu *cu);
1552 static struct die_info *die_specification (struct die_info *die,
1553 struct dwarf2_cu **);
1555 static line_header_up dwarf_decode_line_header (sect_offset sect_off,
1556 struct dwarf2_cu *cu);
1558 static void dwarf_decode_lines (struct line_header *, const char *,
1559 struct dwarf2_cu *, struct partial_symtab *,
1560 CORE_ADDR, int decode_mapping);
1562 static void dwarf2_start_subfile (const char *, const char *);
1564 static struct compunit_symtab *dwarf2_start_symtab (struct dwarf2_cu *,
1565 const char *, const char *,
1568 static struct symbol *new_symbol (struct die_info *, struct type *,
1569 struct dwarf2_cu *, struct symbol * = NULL);
1571 static void dwarf2_const_value (const struct attribute *, struct symbol *,
1572 struct dwarf2_cu *);
1574 static void dwarf2_const_value_attr (const struct attribute *attr,
1577 struct obstack *obstack,
1578 struct dwarf2_cu *cu, LONGEST *value,
1579 const gdb_byte **bytes,
1580 struct dwarf2_locexpr_baton **baton);
1582 static struct type *die_type (struct die_info *, struct dwarf2_cu *);
1584 static int need_gnat_info (struct dwarf2_cu *);
1586 static struct type *die_descriptive_type (struct die_info *,
1587 struct dwarf2_cu *);
1589 static void set_descriptive_type (struct type *, struct die_info *,
1590 struct dwarf2_cu *);
1592 static struct type *die_containing_type (struct die_info *,
1593 struct dwarf2_cu *);
1595 static struct type *lookup_die_type (struct die_info *, const struct attribute *,
1596 struct dwarf2_cu *);
1598 static struct type *read_type_die (struct die_info *, struct dwarf2_cu *);
1600 static struct type *read_type_die_1 (struct die_info *, struct dwarf2_cu *);
1602 static const char *determine_prefix (struct die_info *die, struct dwarf2_cu *);
1604 static char *typename_concat (struct obstack *obs, const char *prefix,
1605 const char *suffix, int physname,
1606 struct dwarf2_cu *cu);
1608 static void read_file_scope (struct die_info *, struct dwarf2_cu *);
1610 static void read_type_unit_scope (struct die_info *, struct dwarf2_cu *);
1612 static void read_func_scope (struct die_info *, struct dwarf2_cu *);
1614 static void read_lexical_block_scope (struct die_info *, struct dwarf2_cu *);
1616 static void read_call_site_scope (struct die_info *die, struct dwarf2_cu *cu);
1618 static void read_variable (struct die_info *die, struct dwarf2_cu *cu);
1620 static int dwarf2_ranges_read (unsigned, CORE_ADDR *, CORE_ADDR *,
1621 struct dwarf2_cu *, struct partial_symtab *);
1623 /* How dwarf2_get_pc_bounds constructed its *LOWPC and *HIGHPC return
1624 values. Keep the items ordered with increasing constraints compliance. */
1627 /* No attribute DW_AT_low_pc, DW_AT_high_pc or DW_AT_ranges was found. */
1628 PC_BOUNDS_NOT_PRESENT,
1630 /* Some of the attributes DW_AT_low_pc, DW_AT_high_pc or DW_AT_ranges
1631 were present but they do not form a valid range of PC addresses. */
1634 /* Discontiguous range was found - that is DW_AT_ranges was found. */
1637 /* Contiguous range was found - DW_AT_low_pc and DW_AT_high_pc were found. */
1641 static enum pc_bounds_kind dwarf2_get_pc_bounds (struct die_info *,
1642 CORE_ADDR *, CORE_ADDR *,
1644 struct partial_symtab *);
1646 static void get_scope_pc_bounds (struct die_info *,
1647 CORE_ADDR *, CORE_ADDR *,
1648 struct dwarf2_cu *);
1650 static void dwarf2_record_block_ranges (struct die_info *, struct block *,
1651 CORE_ADDR, struct dwarf2_cu *);
1653 static void dwarf2_add_field (struct field_info *, struct die_info *,
1654 struct dwarf2_cu *);
1656 static void dwarf2_attach_fields_to_type (struct field_info *,
1657 struct type *, struct dwarf2_cu *);
1659 static void dwarf2_add_member_fn (struct field_info *,
1660 struct die_info *, struct type *,
1661 struct dwarf2_cu *);
1663 static void dwarf2_attach_fn_fields_to_type (struct field_info *,
1665 struct dwarf2_cu *);
1667 static void process_structure_scope (struct die_info *, struct dwarf2_cu *);
1669 static void read_common_block (struct die_info *, struct dwarf2_cu *);
1671 static void read_namespace (struct die_info *die, struct dwarf2_cu *);
1673 static void read_module (struct die_info *die, struct dwarf2_cu *cu);
1675 static struct using_direct **using_directives (enum language);
1677 static void read_import_statement (struct die_info *die, struct dwarf2_cu *);
1679 static int read_namespace_alias (struct die_info *die, struct dwarf2_cu *cu);
1681 static struct type *read_module_type (struct die_info *die,
1682 struct dwarf2_cu *cu);
1684 static const char *namespace_name (struct die_info *die,
1685 int *is_anonymous, struct dwarf2_cu *);
1687 static void process_enumeration_scope (struct die_info *, struct dwarf2_cu *);
1689 static CORE_ADDR decode_locdesc (struct dwarf_block *, struct dwarf2_cu *);
1691 static enum dwarf_array_dim_ordering read_array_order (struct die_info *,
1692 struct dwarf2_cu *);
1694 static struct die_info *read_die_and_siblings_1
1695 (const struct die_reader_specs *, const gdb_byte *, const gdb_byte **,
1698 static struct die_info *read_die_and_siblings (const struct die_reader_specs *,
1699 const gdb_byte *info_ptr,
1700 const gdb_byte **new_info_ptr,
1701 struct die_info *parent);
1703 static const gdb_byte *read_full_die_1 (const struct die_reader_specs *,
1704 struct die_info **, const gdb_byte *,
1707 static const gdb_byte *read_full_die (const struct die_reader_specs *,
1708 struct die_info **, const gdb_byte *,
1711 static void process_die (struct die_info *, struct dwarf2_cu *);
1713 static const char *dwarf2_canonicalize_name (const char *, struct dwarf2_cu *,
1716 static const char *dwarf2_name (struct die_info *die, struct dwarf2_cu *);
1718 static const char *dwarf2_full_name (const char *name,
1719 struct die_info *die,
1720 struct dwarf2_cu *cu);
1722 static const char *dwarf2_physname (const char *name, struct die_info *die,
1723 struct dwarf2_cu *cu);
1725 static struct die_info *dwarf2_extension (struct die_info *die,
1726 struct dwarf2_cu **);
1728 static const char *dwarf_tag_name (unsigned int);
1730 static const char *dwarf_attr_name (unsigned int);
1732 static const char *dwarf_form_name (unsigned int);
1734 static const char *dwarf_bool_name (unsigned int);
1736 static const char *dwarf_type_encoding_name (unsigned int);
1738 static struct die_info *sibling_die (struct die_info *);
1740 static void dump_die_shallow (struct ui_file *, int indent, struct die_info *);
1742 static void dump_die_for_error (struct die_info *);
1744 static void dump_die_1 (struct ui_file *, int level, int max_level,
1747 /*static*/ void dump_die (struct die_info *, int max_level);
1749 static void store_in_ref_table (struct die_info *,
1750 struct dwarf2_cu *);
1752 static sect_offset dwarf2_get_ref_die_offset (const struct attribute *);
1754 static LONGEST dwarf2_get_attr_constant_value (const struct attribute *, int);
1756 static struct die_info *follow_die_ref_or_sig (struct die_info *,
1757 const struct attribute *,
1758 struct dwarf2_cu **);
1760 static struct die_info *follow_die_ref (struct die_info *,
1761 const struct attribute *,
1762 struct dwarf2_cu **);
1764 static struct die_info *follow_die_sig (struct die_info *,
1765 const struct attribute *,
1766 struct dwarf2_cu **);
1768 static struct type *get_signatured_type (struct die_info *, ULONGEST,
1769 struct dwarf2_cu *);
1771 static struct type *get_DW_AT_signature_type (struct die_info *,
1772 const struct attribute *,
1773 struct dwarf2_cu *);
1775 static void load_full_type_unit (struct dwarf2_per_cu_data *per_cu);
1777 static void read_signatured_type (struct signatured_type *);
1779 static int attr_to_dynamic_prop (const struct attribute *attr,
1780 struct die_info *die, struct dwarf2_cu *cu,
1781 struct dynamic_prop *prop);
1783 /* memory allocation interface */
1785 static struct dwarf_block *dwarf_alloc_block (struct dwarf2_cu *);
1787 static struct die_info *dwarf_alloc_die (struct dwarf2_cu *, int);
1789 static void dwarf_decode_macros (struct dwarf2_cu *, unsigned int, int);
1791 static int attr_form_is_block (const struct attribute *);
1793 static int attr_form_is_section_offset (const struct attribute *);
1795 static int attr_form_is_constant (const struct attribute *);
1797 static int attr_form_is_ref (const struct attribute *);
1799 static void fill_in_loclist_baton (struct dwarf2_cu *cu,
1800 struct dwarf2_loclist_baton *baton,
1801 const struct attribute *attr);
1803 static void dwarf2_symbol_mark_computed (const struct attribute *attr,
1805 struct dwarf2_cu *cu,
1808 static const gdb_byte *skip_one_die (const struct die_reader_specs *reader,
1809 const gdb_byte *info_ptr,
1810 struct abbrev_info *abbrev);
1812 static hashval_t partial_die_hash (const void *item);
1814 static int partial_die_eq (const void *item_lhs, const void *item_rhs);
1816 static struct dwarf2_per_cu_data *dwarf2_find_containing_comp_unit
1817 (sect_offset sect_off, unsigned int offset_in_dwz,
1818 struct dwarf2_per_objfile *dwarf2_per_objfile);
1820 static void prepare_one_comp_unit (struct dwarf2_cu *cu,
1821 struct die_info *comp_unit_die,
1822 enum language pretend_language);
1824 static void age_cached_comp_units (struct dwarf2_per_objfile *dwarf2_per_objfile);
1826 static void free_one_cached_comp_unit (struct dwarf2_per_cu_data *);
1828 static struct type *set_die_type (struct die_info *, struct type *,
1829 struct dwarf2_cu *);
1831 static void create_all_comp_units (struct dwarf2_per_objfile *dwarf2_per_objfile);
1833 static int create_all_type_units (struct dwarf2_per_objfile *dwarf2_per_objfile);
1835 static void load_full_comp_unit (struct dwarf2_per_cu_data *,
1838 static void process_full_comp_unit (struct dwarf2_per_cu_data *,
1841 static void process_full_type_unit (struct dwarf2_per_cu_data *,
1844 static void dwarf2_add_dependence (struct dwarf2_cu *,
1845 struct dwarf2_per_cu_data *);
1847 static void dwarf2_mark (struct dwarf2_cu *);
1849 static void dwarf2_clear_marks (struct dwarf2_per_cu_data *);
1851 static struct type *get_die_type_at_offset (sect_offset,
1852 struct dwarf2_per_cu_data *);
1854 static struct type *get_die_type (struct die_info *die, struct dwarf2_cu *cu);
1856 static void queue_comp_unit (struct dwarf2_per_cu_data *per_cu,
1857 enum language pretend_language);
1859 static void process_queue (struct dwarf2_per_objfile *dwarf2_per_objfile);
1861 /* Class, the destructor of which frees all allocated queue entries. This
1862 will only have work to do if an error was thrown while processing the
1863 dwarf. If no error was thrown then the queue entries should have all
1864 been processed, and freed, as we went along. */
1866 class dwarf2_queue_guard
1869 dwarf2_queue_guard () = default;
1871 /* Free any entries remaining on the queue. There should only be
1872 entries left if we hit an error while processing the dwarf. */
1873 ~dwarf2_queue_guard ()
1875 struct dwarf2_queue_item *item, *last;
1877 item = dwarf2_queue;
1880 /* Anything still marked queued is likely to be in an
1881 inconsistent state, so discard it. */
1882 if (item->per_cu->queued)
1884 if (item->per_cu->cu != NULL)
1885 free_one_cached_comp_unit (item->per_cu);
1886 item->per_cu->queued = 0;
1894 dwarf2_queue = dwarf2_queue_tail = NULL;
1898 /* The return type of find_file_and_directory. Note, the enclosed
1899 string pointers are only valid while this object is valid. */
1901 struct file_and_directory
1903 /* The filename. This is never NULL. */
1906 /* The compilation directory. NULL if not known. If we needed to
1907 compute a new string, this points to COMP_DIR_STORAGE, otherwise,
1908 points directly to the DW_AT_comp_dir string attribute owned by
1909 the obstack that owns the DIE. */
1910 const char *comp_dir;
1912 /* If we needed to build a new string for comp_dir, this is what
1913 owns the storage. */
1914 std::string comp_dir_storage;
1917 static file_and_directory find_file_and_directory (struct die_info *die,
1918 struct dwarf2_cu *cu);
1920 static char *file_full_name (int file, struct line_header *lh,
1921 const char *comp_dir);
1923 /* Expected enum dwarf_unit_type for read_comp_unit_head. */
1924 enum class rcuh_kind { COMPILE, TYPE };
1926 static const gdb_byte *read_and_check_comp_unit_head
1927 (struct dwarf2_per_objfile* dwarf2_per_objfile,
1928 struct comp_unit_head *header,
1929 struct dwarf2_section_info *section,
1930 struct dwarf2_section_info *abbrev_section, const gdb_byte *info_ptr,
1931 rcuh_kind section_kind);
1933 static void init_cutu_and_read_dies
1934 (struct dwarf2_per_cu_data *this_cu, struct abbrev_table *abbrev_table,
1935 int use_existing_cu, int keep,
1936 die_reader_func_ftype *die_reader_func, void *data);
1938 static void init_cutu_and_read_dies_simple
1939 (struct dwarf2_per_cu_data *this_cu,
1940 die_reader_func_ftype *die_reader_func, void *data);
1942 static htab_t allocate_signatured_type_table (struct objfile *objfile);
1944 static htab_t allocate_dwo_unit_table (struct objfile *objfile);
1946 static struct dwo_unit *lookup_dwo_unit_in_dwp
1947 (struct dwarf2_per_objfile *dwarf2_per_objfile,
1948 struct dwp_file *dwp_file, const char *comp_dir,
1949 ULONGEST signature, int is_debug_types);
1951 static struct dwp_file *get_dwp_file
1952 (struct dwarf2_per_objfile *dwarf2_per_objfile);
1954 static struct dwo_unit *lookup_dwo_comp_unit
1955 (struct dwarf2_per_cu_data *, const char *, const char *, ULONGEST);
1957 static struct dwo_unit *lookup_dwo_type_unit
1958 (struct signatured_type *, const char *, const char *);
1960 static void queue_and_load_all_dwo_tus (struct dwarf2_per_cu_data *);
1962 static void free_dwo_file (struct dwo_file *);
1964 /* A unique_ptr helper to free a dwo_file. */
1966 struct dwo_file_deleter
1968 void operator() (struct dwo_file *df) const
1974 /* A unique pointer to a dwo_file. */
1976 typedef std::unique_ptr<struct dwo_file, dwo_file_deleter> dwo_file_up;
1978 static void process_cu_includes (struct dwarf2_per_objfile *dwarf2_per_objfile);
1980 static void check_producer (struct dwarf2_cu *cu);
1982 static void free_line_header_voidp (void *arg);
1984 /* Various complaints about symbol reading that don't abort the process. */
1987 dwarf2_statement_list_fits_in_line_number_section_complaint (void)
1989 complaint (&symfile_complaints,
1990 _("statement list doesn't fit in .debug_line section"));
1994 dwarf2_debug_line_missing_file_complaint (void)
1996 complaint (&symfile_complaints,
1997 _(".debug_line section has line data without a file"));
2001 dwarf2_debug_line_missing_end_sequence_complaint (void)
2003 complaint (&symfile_complaints,
2004 _(".debug_line section has line "
2005 "program sequence without an end"));
2009 dwarf2_complex_location_expr_complaint (void)
2011 complaint (&symfile_complaints, _("location expression too complex"));
2015 dwarf2_const_value_length_mismatch_complaint (const char *arg1, int arg2,
2018 complaint (&symfile_complaints,
2019 _("const value length mismatch for '%s', got %d, expected %d"),
2024 dwarf2_section_buffer_overflow_complaint (struct dwarf2_section_info *section)
2026 complaint (&symfile_complaints,
2027 _("debug info runs off end of %s section"
2029 get_section_name (section),
2030 get_section_file_name (section));
2034 dwarf2_macro_malformed_definition_complaint (const char *arg1)
2036 complaint (&symfile_complaints,
2037 _("macro debug info contains a "
2038 "malformed macro definition:\n`%s'"),
2043 dwarf2_invalid_attrib_class_complaint (const char *arg1, const char *arg2)
2045 complaint (&symfile_complaints,
2046 _("invalid attribute class or form for '%s' in '%s'"),
2050 /* Hash function for line_header_hash. */
2053 line_header_hash (const struct line_header *ofs)
2055 return to_underlying (ofs->sect_off) ^ ofs->offset_in_dwz;
2058 /* Hash function for htab_create_alloc_ex for line_header_hash. */
2061 line_header_hash_voidp (const void *item)
2063 const struct line_header *ofs = (const struct line_header *) item;
2065 return line_header_hash (ofs);
2068 /* Equality function for line_header_hash. */
2071 line_header_eq_voidp (const void *item_lhs, const void *item_rhs)
2073 const struct line_header *ofs_lhs = (const struct line_header *) item_lhs;
2074 const struct line_header *ofs_rhs = (const struct line_header *) item_rhs;
2076 return (ofs_lhs->sect_off == ofs_rhs->sect_off
2077 && ofs_lhs->offset_in_dwz == ofs_rhs->offset_in_dwz);
2082 /* Read the given attribute value as an address, taking the attribute's
2083 form into account. */
2086 attr_value_as_address (struct attribute *attr)
2090 if (attr->form != DW_FORM_addr && attr->form != DW_FORM_GNU_addr_index)
2092 /* Aside from a few clearly defined exceptions, attributes that
2093 contain an address must always be in DW_FORM_addr form.
2094 Unfortunately, some compilers happen to be violating this
2095 requirement by encoding addresses using other forms, such
2096 as DW_FORM_data4 for example. For those broken compilers,
2097 we try to do our best, without any guarantee of success,
2098 to interpret the address correctly. It would also be nice
2099 to generate a complaint, but that would require us to maintain
2100 a list of legitimate cases where a non-address form is allowed,
2101 as well as update callers to pass in at least the CU's DWARF
2102 version. This is more overhead than what we're willing to
2103 expand for a pretty rare case. */
2104 addr = DW_UNSND (attr);
2107 addr = DW_ADDR (attr);
2112 /* See declaration. */
2114 dwarf2_per_objfile::dwarf2_per_objfile (struct objfile *objfile_,
2115 const dwarf2_debug_sections *names)
2116 : objfile (objfile_)
2119 names = &dwarf2_elf_names;
2121 bfd *obfd = objfile->obfd;
2123 for (asection *sec = obfd->sections; sec != NULL; sec = sec->next)
2124 locate_sections (obfd, sec, *names);
2127 static void free_dwo_files (htab_t dwo_files, struct objfile *objfile);
2129 dwarf2_per_objfile::~dwarf2_per_objfile ()
2131 /* Cached DIE trees use xmalloc and the comp_unit_obstack. */
2132 free_cached_comp_units ();
2134 if (quick_file_names_table)
2135 htab_delete (quick_file_names_table);
2137 if (line_header_hash)
2138 htab_delete (line_header_hash);
2140 for (int ix = 0; ix < n_comp_units; ++ix)
2141 VEC_free (dwarf2_per_cu_ptr, all_comp_units[ix]->imported_symtabs);
2143 for (int ix = 0; ix < n_type_units; ++ix)
2144 VEC_free (dwarf2_per_cu_ptr,
2145 all_type_units[ix]->per_cu.imported_symtabs);
2146 xfree (all_type_units);
2148 VEC_free (dwarf2_section_info_def, types);
2150 if (dwo_files != NULL)
2151 free_dwo_files (dwo_files, objfile);
2152 if (dwp_file != NULL)
2153 gdb_bfd_unref (dwp_file->dbfd);
2155 if (dwz_file != NULL && dwz_file->dwz_bfd)
2156 gdb_bfd_unref (dwz_file->dwz_bfd);
2158 if (index_table != NULL)
2159 index_table->~mapped_index ();
2161 /* Everything else should be on the objfile obstack. */
2164 /* See declaration. */
2167 dwarf2_per_objfile::free_cached_comp_units ()
2169 dwarf2_per_cu_data *per_cu = read_in_chain;
2170 dwarf2_per_cu_data **last_chain = &read_in_chain;
2171 while (per_cu != NULL)
2173 dwarf2_per_cu_data *next_cu = per_cu->cu->read_in_chain;
2176 *last_chain = next_cu;
2181 /* A helper class that calls free_cached_comp_units on
2184 class free_cached_comp_units
2188 explicit free_cached_comp_units (dwarf2_per_objfile *per_objfile)
2189 : m_per_objfile (per_objfile)
2193 ~free_cached_comp_units ()
2195 m_per_objfile->free_cached_comp_units ();
2198 DISABLE_COPY_AND_ASSIGN (free_cached_comp_units);
2202 dwarf2_per_objfile *m_per_objfile;
2205 /* Try to locate the sections we need for DWARF 2 debugging
2206 information and return true if we have enough to do something.
2207 NAMES points to the dwarf2 section names, or is NULL if the standard
2208 ELF names are used. */
2211 dwarf2_has_info (struct objfile *objfile,
2212 const struct dwarf2_debug_sections *names)
2214 if (objfile->flags & OBJF_READNEVER)
2217 struct dwarf2_per_objfile *dwarf2_per_objfile
2218 = get_dwarf2_per_objfile (objfile);
2220 if (dwarf2_per_objfile == NULL)
2222 /* Initialize per-objfile state. */
2224 = new (&objfile->objfile_obstack) struct dwarf2_per_objfile (objfile,
2226 set_dwarf2_per_objfile (objfile, dwarf2_per_objfile);
2228 return (!dwarf2_per_objfile->info.is_virtual
2229 && dwarf2_per_objfile->info.s.section != NULL
2230 && !dwarf2_per_objfile->abbrev.is_virtual
2231 && dwarf2_per_objfile->abbrev.s.section != NULL);
2234 /* Return the containing section of virtual section SECTION. */
2236 static struct dwarf2_section_info *
2237 get_containing_section (const struct dwarf2_section_info *section)
2239 gdb_assert (section->is_virtual);
2240 return section->s.containing_section;
2243 /* Return the bfd owner of SECTION. */
2246 get_section_bfd_owner (const struct dwarf2_section_info *section)
2248 if (section->is_virtual)
2250 section = get_containing_section (section);
2251 gdb_assert (!section->is_virtual);
2253 return section->s.section->owner;
2256 /* Return the bfd section of SECTION.
2257 Returns NULL if the section is not present. */
2260 get_section_bfd_section (const struct dwarf2_section_info *section)
2262 if (section->is_virtual)
2264 section = get_containing_section (section);
2265 gdb_assert (!section->is_virtual);
2267 return section->s.section;
2270 /* Return the name of SECTION. */
2273 get_section_name (const struct dwarf2_section_info *section)
2275 asection *sectp = get_section_bfd_section (section);
2277 gdb_assert (sectp != NULL);
2278 return bfd_section_name (get_section_bfd_owner (section), sectp);
2281 /* Return the name of the file SECTION is in. */
2284 get_section_file_name (const struct dwarf2_section_info *section)
2286 bfd *abfd = get_section_bfd_owner (section);
2288 return bfd_get_filename (abfd);
2291 /* Return the id of SECTION.
2292 Returns 0 if SECTION doesn't exist. */
2295 get_section_id (const struct dwarf2_section_info *section)
2297 asection *sectp = get_section_bfd_section (section);
2304 /* Return the flags of SECTION.
2305 SECTION (or containing section if this is a virtual section) must exist. */
2308 get_section_flags (const struct dwarf2_section_info *section)
2310 asection *sectp = get_section_bfd_section (section);
2312 gdb_assert (sectp != NULL);
2313 return bfd_get_section_flags (sectp->owner, sectp);
2316 /* When loading sections, we look either for uncompressed section or for
2317 compressed section names. */
2320 section_is_p (const char *section_name,
2321 const struct dwarf2_section_names *names)
2323 if (names->normal != NULL
2324 && strcmp (section_name, names->normal) == 0)
2326 if (names->compressed != NULL
2327 && strcmp (section_name, names->compressed) == 0)
2332 /* See declaration. */
2335 dwarf2_per_objfile::locate_sections (bfd *abfd, asection *sectp,
2336 const dwarf2_debug_sections &names)
2338 flagword aflag = bfd_get_section_flags (abfd, sectp);
2340 if ((aflag & SEC_HAS_CONTENTS) == 0)
2343 else if (section_is_p (sectp->name, &names.info))
2345 this->info.s.section = sectp;
2346 this->info.size = bfd_get_section_size (sectp);
2348 else if (section_is_p (sectp->name, &names.abbrev))
2350 this->abbrev.s.section = sectp;
2351 this->abbrev.size = bfd_get_section_size (sectp);
2353 else if (section_is_p (sectp->name, &names.line))
2355 this->line.s.section = sectp;
2356 this->line.size = bfd_get_section_size (sectp);
2358 else if (section_is_p (sectp->name, &names.loc))
2360 this->loc.s.section = sectp;
2361 this->loc.size = bfd_get_section_size (sectp);
2363 else if (section_is_p (sectp->name, &names.loclists))
2365 this->loclists.s.section = sectp;
2366 this->loclists.size = bfd_get_section_size (sectp);
2368 else if (section_is_p (sectp->name, &names.macinfo))
2370 this->macinfo.s.section = sectp;
2371 this->macinfo.size = bfd_get_section_size (sectp);
2373 else if (section_is_p (sectp->name, &names.macro))
2375 this->macro.s.section = sectp;
2376 this->macro.size = bfd_get_section_size (sectp);
2378 else if (section_is_p (sectp->name, &names.str))
2380 this->str.s.section = sectp;
2381 this->str.size = bfd_get_section_size (sectp);
2383 else if (section_is_p (sectp->name, &names.line_str))
2385 this->line_str.s.section = sectp;
2386 this->line_str.size = bfd_get_section_size (sectp);
2388 else if (section_is_p (sectp->name, &names.addr))
2390 this->addr.s.section = sectp;
2391 this->addr.size = bfd_get_section_size (sectp);
2393 else if (section_is_p (sectp->name, &names.frame))
2395 this->frame.s.section = sectp;
2396 this->frame.size = bfd_get_section_size (sectp);
2398 else if (section_is_p (sectp->name, &names.eh_frame))
2400 this->eh_frame.s.section = sectp;
2401 this->eh_frame.size = bfd_get_section_size (sectp);
2403 else if (section_is_p (sectp->name, &names.ranges))
2405 this->ranges.s.section = sectp;
2406 this->ranges.size = bfd_get_section_size (sectp);
2408 else if (section_is_p (sectp->name, &names.rnglists))
2410 this->rnglists.s.section = sectp;
2411 this->rnglists.size = bfd_get_section_size (sectp);
2413 else if (section_is_p (sectp->name, &names.types))
2415 struct dwarf2_section_info type_section;
2417 memset (&type_section, 0, sizeof (type_section));
2418 type_section.s.section = sectp;
2419 type_section.size = bfd_get_section_size (sectp);
2421 VEC_safe_push (dwarf2_section_info_def, this->types,
2424 else if (section_is_p (sectp->name, &names.gdb_index))
2426 this->gdb_index.s.section = sectp;
2427 this->gdb_index.size = bfd_get_section_size (sectp);
2429 else if (section_is_p (sectp->name, &names.debug_names))
2431 this->debug_names.s.section = sectp;
2432 this->debug_names.size = bfd_get_section_size (sectp);
2434 else if (section_is_p (sectp->name, &names.debug_aranges))
2436 this->debug_aranges.s.section = sectp;
2437 this->debug_aranges.size = bfd_get_section_size (sectp);
2440 if ((bfd_get_section_flags (abfd, sectp) & (SEC_LOAD | SEC_ALLOC))
2441 && bfd_section_vma (abfd, sectp) == 0)
2442 this->has_section_at_zero = true;
2445 /* A helper function that decides whether a section is empty,
2449 dwarf2_section_empty_p (const struct dwarf2_section_info *section)
2451 if (section->is_virtual)
2452 return section->size == 0;
2453 return section->s.section == NULL || section->size == 0;
2456 /* See dwarf2read.h. */
2459 dwarf2_read_section (struct objfile *objfile, dwarf2_section_info *info)
2463 gdb_byte *buf, *retbuf;
2467 info->buffer = NULL;
2470 if (dwarf2_section_empty_p (info))
2473 sectp = get_section_bfd_section (info);
2475 /* If this is a virtual section we need to read in the real one first. */
2476 if (info->is_virtual)
2478 struct dwarf2_section_info *containing_section =
2479 get_containing_section (info);
2481 gdb_assert (sectp != NULL);
2482 if ((sectp->flags & SEC_RELOC) != 0)
2484 error (_("Dwarf Error: DWP format V2 with relocations is not"
2485 " supported in section %s [in module %s]"),
2486 get_section_name (info), get_section_file_name (info));
2488 dwarf2_read_section (objfile, containing_section);
2489 /* Other code should have already caught virtual sections that don't
2491 gdb_assert (info->virtual_offset + info->size
2492 <= containing_section->size);
2493 /* If the real section is empty or there was a problem reading the
2494 section we shouldn't get here. */
2495 gdb_assert (containing_section->buffer != NULL);
2496 info->buffer = containing_section->buffer + info->virtual_offset;
2500 /* If the section has relocations, we must read it ourselves.
2501 Otherwise we attach it to the BFD. */
2502 if ((sectp->flags & SEC_RELOC) == 0)
2504 info->buffer = gdb_bfd_map_section (sectp, &info->size);
2508 buf = (gdb_byte *) obstack_alloc (&objfile->objfile_obstack, info->size);
2511 /* When debugging .o files, we may need to apply relocations; see
2512 http://sourceware.org/ml/gdb-patches/2002-04/msg00136.html .
2513 We never compress sections in .o files, so we only need to
2514 try this when the section is not compressed. */
2515 retbuf = symfile_relocate_debug_section (objfile, sectp, buf);
2518 info->buffer = retbuf;
2522 abfd = get_section_bfd_owner (info);
2523 gdb_assert (abfd != NULL);
2525 if (bfd_seek (abfd, sectp->filepos, SEEK_SET) != 0
2526 || bfd_bread (buf, info->size, abfd) != info->size)
2528 error (_("Dwarf Error: Can't read DWARF data"
2529 " in section %s [in module %s]"),
2530 bfd_section_name (abfd, sectp), bfd_get_filename (abfd));
2534 /* A helper function that returns the size of a section in a safe way.
2535 If you are positive that the section has been read before using the
2536 size, then it is safe to refer to the dwarf2_section_info object's
2537 "size" field directly. In other cases, you must call this
2538 function, because for compressed sections the size field is not set
2539 correctly until the section has been read. */
2541 static bfd_size_type
2542 dwarf2_section_size (struct objfile *objfile,
2543 struct dwarf2_section_info *info)
2546 dwarf2_read_section (objfile, info);
2550 /* Fill in SECTP, BUFP and SIZEP with section info, given OBJFILE and
2554 dwarf2_get_section_info (struct objfile *objfile,
2555 enum dwarf2_section_enum sect,
2556 asection **sectp, const gdb_byte **bufp,
2557 bfd_size_type *sizep)
2559 struct dwarf2_per_objfile *data
2560 = (struct dwarf2_per_objfile *) objfile_data (objfile,
2561 dwarf2_objfile_data_key);
2562 struct dwarf2_section_info *info;
2564 /* We may see an objfile without any DWARF, in which case we just
2575 case DWARF2_DEBUG_FRAME:
2576 info = &data->frame;
2578 case DWARF2_EH_FRAME:
2579 info = &data->eh_frame;
2582 gdb_assert_not_reached ("unexpected section");
2585 dwarf2_read_section (objfile, info);
2587 *sectp = get_section_bfd_section (info);
2588 *bufp = info->buffer;
2589 *sizep = info->size;
2592 /* A helper function to find the sections for a .dwz file. */
2595 locate_dwz_sections (bfd *abfd, asection *sectp, void *arg)
2597 struct dwz_file *dwz_file = (struct dwz_file *) arg;
2599 /* Note that we only support the standard ELF names, because .dwz
2600 is ELF-only (at the time of writing). */
2601 if (section_is_p (sectp->name, &dwarf2_elf_names.abbrev))
2603 dwz_file->abbrev.s.section = sectp;
2604 dwz_file->abbrev.size = bfd_get_section_size (sectp);
2606 else if (section_is_p (sectp->name, &dwarf2_elf_names.info))
2608 dwz_file->info.s.section = sectp;
2609 dwz_file->info.size = bfd_get_section_size (sectp);
2611 else if (section_is_p (sectp->name, &dwarf2_elf_names.str))
2613 dwz_file->str.s.section = sectp;
2614 dwz_file->str.size = bfd_get_section_size (sectp);
2616 else if (section_is_p (sectp->name, &dwarf2_elf_names.line))
2618 dwz_file->line.s.section = sectp;
2619 dwz_file->line.size = bfd_get_section_size (sectp);
2621 else if (section_is_p (sectp->name, &dwarf2_elf_names.macro))
2623 dwz_file->macro.s.section = sectp;
2624 dwz_file->macro.size = bfd_get_section_size (sectp);
2626 else if (section_is_p (sectp->name, &dwarf2_elf_names.gdb_index))
2628 dwz_file->gdb_index.s.section = sectp;
2629 dwz_file->gdb_index.size = bfd_get_section_size (sectp);
2631 else if (section_is_p (sectp->name, &dwarf2_elf_names.debug_names))
2633 dwz_file->debug_names.s.section = sectp;
2634 dwz_file->debug_names.size = bfd_get_section_size (sectp);
2638 /* Open the separate '.dwz' debug file, if needed. Return NULL if
2639 there is no .gnu_debugaltlink section in the file. Error if there
2640 is such a section but the file cannot be found. */
2642 static struct dwz_file *
2643 dwarf2_get_dwz_file (struct dwarf2_per_objfile *dwarf2_per_objfile)
2645 const char *filename;
2646 struct dwz_file *result;
2647 bfd_size_type buildid_len_arg;
2651 if (dwarf2_per_objfile->dwz_file != NULL)
2652 return dwarf2_per_objfile->dwz_file;
2654 bfd_set_error (bfd_error_no_error);
2655 gdb::unique_xmalloc_ptr<char> data
2656 (bfd_get_alt_debug_link_info (dwarf2_per_objfile->objfile->obfd,
2657 &buildid_len_arg, &buildid));
2660 if (bfd_get_error () == bfd_error_no_error)
2662 error (_("could not read '.gnu_debugaltlink' section: %s"),
2663 bfd_errmsg (bfd_get_error ()));
2666 gdb::unique_xmalloc_ptr<bfd_byte> buildid_holder (buildid);
2668 buildid_len = (size_t) buildid_len_arg;
2670 filename = data.get ();
2672 std::string abs_storage;
2673 if (!IS_ABSOLUTE_PATH (filename))
2675 gdb::unique_xmalloc_ptr<char> abs
2676 = gdb_realpath (objfile_name (dwarf2_per_objfile->objfile));
2678 abs_storage = ldirname (abs.get ()) + SLASH_STRING + filename;
2679 filename = abs_storage.c_str ();
2682 /* First try the file name given in the section. If that doesn't
2683 work, try to use the build-id instead. */
2684 gdb_bfd_ref_ptr dwz_bfd (gdb_bfd_open (filename, gnutarget, -1));
2685 if (dwz_bfd != NULL)
2687 if (!build_id_verify (dwz_bfd.get (), buildid_len, buildid))
2691 if (dwz_bfd == NULL)
2692 dwz_bfd = build_id_to_debug_bfd (buildid_len, buildid);
2694 if (dwz_bfd == NULL)
2695 error (_("could not find '.gnu_debugaltlink' file for %s"),
2696 objfile_name (dwarf2_per_objfile->objfile));
2698 result = OBSTACK_ZALLOC (&dwarf2_per_objfile->objfile->objfile_obstack,
2700 result->dwz_bfd = dwz_bfd.release ();
2702 bfd_map_over_sections (result->dwz_bfd, locate_dwz_sections, result);
2704 gdb_bfd_record_inclusion (dwarf2_per_objfile->objfile->obfd, result->dwz_bfd);
2705 dwarf2_per_objfile->dwz_file = result;
2709 /* DWARF quick_symbols_functions support. */
2711 /* TUs can share .debug_line entries, and there can be a lot more TUs than
2712 unique line tables, so we maintain a separate table of all .debug_line
2713 derived entries to support the sharing.
2714 All the quick functions need is the list of file names. We discard the
2715 line_header when we're done and don't need to record it here. */
2716 struct quick_file_names
2718 /* The data used to construct the hash key. */
2719 struct stmt_list_hash hash;
2721 /* The number of entries in file_names, real_names. */
2722 unsigned int num_file_names;
2724 /* The file names from the line table, after being run through
2726 const char **file_names;
2728 /* The file names from the line table after being run through
2729 gdb_realpath. These are computed lazily. */
2730 const char **real_names;
2733 /* When using the index (and thus not using psymtabs), each CU has an
2734 object of this type. This is used to hold information needed by
2735 the various "quick" methods. */
2736 struct dwarf2_per_cu_quick_data
2738 /* The file table. This can be NULL if there was no file table
2739 or it's currently not read in.
2740 NOTE: This points into dwarf2_per_objfile->quick_file_names_table. */
2741 struct quick_file_names *file_names;
2743 /* The corresponding symbol table. This is NULL if symbols for this
2744 CU have not yet been read. */
2745 struct compunit_symtab *compunit_symtab;
2747 /* A temporary mark bit used when iterating over all CUs in
2748 expand_symtabs_matching. */
2749 unsigned int mark : 1;
2751 /* True if we've tried to read the file table and found there isn't one.
2752 There will be no point in trying to read it again next time. */
2753 unsigned int no_file_data : 1;
2756 /* Utility hash function for a stmt_list_hash. */
2759 hash_stmt_list_entry (const struct stmt_list_hash *stmt_list_hash)
2763 if (stmt_list_hash->dwo_unit != NULL)
2764 v += (uintptr_t) stmt_list_hash->dwo_unit->dwo_file;
2765 v += to_underlying (stmt_list_hash->line_sect_off);
2769 /* Utility equality function for a stmt_list_hash. */
2772 eq_stmt_list_entry (const struct stmt_list_hash *lhs,
2773 const struct stmt_list_hash *rhs)
2775 if ((lhs->dwo_unit != NULL) != (rhs->dwo_unit != NULL))
2777 if (lhs->dwo_unit != NULL
2778 && lhs->dwo_unit->dwo_file != rhs->dwo_unit->dwo_file)
2781 return lhs->line_sect_off == rhs->line_sect_off;
2784 /* Hash function for a quick_file_names. */
2787 hash_file_name_entry (const void *e)
2789 const struct quick_file_names *file_data
2790 = (const struct quick_file_names *) e;
2792 return hash_stmt_list_entry (&file_data->hash);
2795 /* Equality function for a quick_file_names. */
2798 eq_file_name_entry (const void *a, const void *b)
2800 const struct quick_file_names *ea = (const struct quick_file_names *) a;
2801 const struct quick_file_names *eb = (const struct quick_file_names *) b;
2803 return eq_stmt_list_entry (&ea->hash, &eb->hash);
2806 /* Delete function for a quick_file_names. */
2809 delete_file_name_entry (void *e)
2811 struct quick_file_names *file_data = (struct quick_file_names *) e;
2814 for (i = 0; i < file_data->num_file_names; ++i)
2816 xfree ((void*) file_data->file_names[i]);
2817 if (file_data->real_names)
2818 xfree ((void*) file_data->real_names[i]);
2821 /* The space for the struct itself lives on objfile_obstack,
2822 so we don't free it here. */
2825 /* Create a quick_file_names hash table. */
2828 create_quick_file_names_table (unsigned int nr_initial_entries)
2830 return htab_create_alloc (nr_initial_entries,
2831 hash_file_name_entry, eq_file_name_entry,
2832 delete_file_name_entry, xcalloc, xfree);
2835 /* Read in PER_CU->CU. This function is unrelated to symtabs, symtab would
2836 have to be created afterwards. You should call age_cached_comp_units after
2837 processing PER_CU->CU. dw2_setup must have been already called. */
2840 load_cu (struct dwarf2_per_cu_data *per_cu)
2842 if (per_cu->is_debug_types)
2843 load_full_type_unit (per_cu);
2845 load_full_comp_unit (per_cu, language_minimal);
2847 if (per_cu->cu == NULL)
2848 return; /* Dummy CU. */
2850 dwarf2_find_base_address (per_cu->cu->dies, per_cu->cu);
2853 /* Read in the symbols for PER_CU. */
2856 dw2_do_instantiate_symtab (struct dwarf2_per_cu_data *per_cu)
2858 struct dwarf2_per_objfile *dwarf2_per_objfile = per_cu->dwarf2_per_objfile;
2860 /* Skip type_unit_groups, reading the type units they contain
2861 is handled elsewhere. */
2862 if (IS_TYPE_UNIT_GROUP (per_cu))
2865 /* The destructor of dwarf2_queue_guard frees any entries left on
2866 the queue. After this point we're guaranteed to leave this function
2867 with the dwarf queue empty. */
2868 dwarf2_queue_guard q_guard;
2870 if (dwarf2_per_objfile->using_index
2871 ? per_cu->v.quick->compunit_symtab == NULL
2872 : (per_cu->v.psymtab == NULL || !per_cu->v.psymtab->readin))
2874 queue_comp_unit (per_cu, language_minimal);
2877 /* If we just loaded a CU from a DWO, and we're working with an index
2878 that may badly handle TUs, load all the TUs in that DWO as well.
2879 http://sourceware.org/bugzilla/show_bug.cgi?id=15021 */
2880 if (!per_cu->is_debug_types
2881 && per_cu->cu != NULL
2882 && per_cu->cu->dwo_unit != NULL
2883 && dwarf2_per_objfile->index_table != NULL
2884 && dwarf2_per_objfile->index_table->version <= 7
2885 /* DWP files aren't supported yet. */
2886 && get_dwp_file (dwarf2_per_objfile) == NULL)
2887 queue_and_load_all_dwo_tus (per_cu);
2890 process_queue (dwarf2_per_objfile);
2892 /* Age the cache, releasing compilation units that have not
2893 been used recently. */
2894 age_cached_comp_units (dwarf2_per_objfile);
2897 /* Ensure that the symbols for PER_CU have been read in. OBJFILE is
2898 the objfile from which this CU came. Returns the resulting symbol
2901 static struct compunit_symtab *
2902 dw2_instantiate_symtab (struct dwarf2_per_cu_data *per_cu)
2904 struct dwarf2_per_objfile *dwarf2_per_objfile = per_cu->dwarf2_per_objfile;
2906 gdb_assert (dwarf2_per_objfile->using_index);
2907 if (!per_cu->v.quick->compunit_symtab)
2909 free_cached_comp_units freer (dwarf2_per_objfile);
2910 scoped_restore decrementer = increment_reading_symtab ();
2911 dw2_do_instantiate_symtab (per_cu);
2912 process_cu_includes (dwarf2_per_objfile);
2915 return per_cu->v.quick->compunit_symtab;
2918 /* See declaration. */
2920 dwarf2_per_cu_data *
2921 dwarf2_per_objfile::get_cutu (int index)
2923 if (index >= this->n_comp_units)
2925 index -= this->n_comp_units;
2926 gdb_assert (index < this->n_type_units);
2927 return &this->all_type_units[index]->per_cu;
2930 return this->all_comp_units[index];
2933 /* See declaration. */
2935 dwarf2_per_cu_data *
2936 dwarf2_per_objfile::get_cu (int index)
2938 gdb_assert (index >= 0 && index < this->n_comp_units);
2940 return this->all_comp_units[index];
2943 /* See declaration. */
2946 dwarf2_per_objfile::get_tu (int index)
2948 gdb_assert (index >= 0 && index < this->n_type_units);
2950 return this->all_type_units[index];
2953 /* Return a new dwarf2_per_cu_data allocated on OBJFILE's
2954 objfile_obstack, and constructed with the specified field
2957 static dwarf2_per_cu_data *
2958 create_cu_from_index_list (struct dwarf2_per_objfile *dwarf2_per_objfile,
2959 struct dwarf2_section_info *section,
2961 sect_offset sect_off, ULONGEST length)
2963 struct objfile *objfile = dwarf2_per_objfile->objfile;
2964 dwarf2_per_cu_data *the_cu
2965 = OBSTACK_ZALLOC (&objfile->objfile_obstack,
2966 struct dwarf2_per_cu_data);
2967 the_cu->sect_off = sect_off;
2968 the_cu->length = length;
2969 the_cu->dwarf2_per_objfile = dwarf2_per_objfile;
2970 the_cu->section = section;
2971 the_cu->v.quick = OBSTACK_ZALLOC (&objfile->objfile_obstack,
2972 struct dwarf2_per_cu_quick_data);
2973 the_cu->is_dwz = is_dwz;
2977 /* A helper for create_cus_from_index that handles a given list of
2981 create_cus_from_index_list (struct objfile *objfile,
2982 const gdb_byte *cu_list, offset_type n_elements,
2983 struct dwarf2_section_info *section,
2988 struct dwarf2_per_objfile *dwarf2_per_objfile
2989 = get_dwarf2_per_objfile (objfile);
2991 for (i = 0; i < n_elements; i += 2)
2993 gdb_static_assert (sizeof (ULONGEST) >= 8);
2995 sect_offset sect_off
2996 = (sect_offset) extract_unsigned_integer (cu_list, 8, BFD_ENDIAN_LITTLE);
2997 ULONGEST length = extract_unsigned_integer (cu_list + 8, 8, BFD_ENDIAN_LITTLE);
3000 dwarf2_per_objfile->all_comp_units[base_offset + i / 2]
3001 = create_cu_from_index_list (dwarf2_per_objfile, section, is_dwz,
3006 /* Read the CU list from the mapped index, and use it to create all
3007 the CU objects for this objfile. */
3010 create_cus_from_index (struct objfile *objfile,
3011 const gdb_byte *cu_list, offset_type cu_list_elements,
3012 const gdb_byte *dwz_list, offset_type dwz_elements)
3014 struct dwz_file *dwz;
3015 struct dwarf2_per_objfile *dwarf2_per_objfile
3016 = get_dwarf2_per_objfile (objfile);
3018 dwarf2_per_objfile->n_comp_units = (cu_list_elements + dwz_elements) / 2;
3019 dwarf2_per_objfile->all_comp_units =
3020 XOBNEWVEC (&objfile->objfile_obstack, struct dwarf2_per_cu_data *,
3021 dwarf2_per_objfile->n_comp_units);
3023 create_cus_from_index_list (objfile, cu_list, cu_list_elements,
3024 &dwarf2_per_objfile->info, 0, 0);
3026 if (dwz_elements == 0)
3029 dwz = dwarf2_get_dwz_file (dwarf2_per_objfile);
3030 create_cus_from_index_list (objfile, dwz_list, dwz_elements, &dwz->info, 1,
3031 cu_list_elements / 2);
3034 /* Create the signatured type hash table from the index. */
3037 create_signatured_type_table_from_index (struct objfile *objfile,
3038 struct dwarf2_section_info *section,
3039 const gdb_byte *bytes,
3040 offset_type elements)
3043 htab_t sig_types_hash;
3044 struct dwarf2_per_objfile *dwarf2_per_objfile
3045 = get_dwarf2_per_objfile (objfile);
3047 dwarf2_per_objfile->n_type_units
3048 = dwarf2_per_objfile->n_allocated_type_units
3050 dwarf2_per_objfile->all_type_units =
3051 XNEWVEC (struct signatured_type *, dwarf2_per_objfile->n_type_units);
3053 sig_types_hash = allocate_signatured_type_table (objfile);
3055 for (i = 0; i < elements; i += 3)
3057 struct signatured_type *sig_type;
3060 cu_offset type_offset_in_tu;
3062 gdb_static_assert (sizeof (ULONGEST) >= 8);
3063 sect_offset sect_off
3064 = (sect_offset) extract_unsigned_integer (bytes, 8, BFD_ENDIAN_LITTLE);
3066 = (cu_offset) extract_unsigned_integer (bytes + 8, 8,
3068 signature = extract_unsigned_integer (bytes + 16, 8, BFD_ENDIAN_LITTLE);
3071 sig_type = OBSTACK_ZALLOC (&objfile->objfile_obstack,
3072 struct signatured_type);
3073 sig_type->signature = signature;
3074 sig_type->type_offset_in_tu = type_offset_in_tu;
3075 sig_type->per_cu.is_debug_types = 1;
3076 sig_type->per_cu.section = section;
3077 sig_type->per_cu.sect_off = sect_off;
3078 sig_type->per_cu.dwarf2_per_objfile = dwarf2_per_objfile;
3079 sig_type->per_cu.v.quick
3080 = OBSTACK_ZALLOC (&objfile->objfile_obstack,
3081 struct dwarf2_per_cu_quick_data);
3083 slot = htab_find_slot (sig_types_hash, sig_type, INSERT);
3086 dwarf2_per_objfile->all_type_units[i / 3] = sig_type;
3089 dwarf2_per_objfile->signatured_types = sig_types_hash;
3092 /* Create the signatured type hash table from .debug_names. */
3095 create_signatured_type_table_from_debug_names
3096 (struct dwarf2_per_objfile *dwarf2_per_objfile,
3097 const mapped_debug_names &map,
3098 struct dwarf2_section_info *section,
3099 struct dwarf2_section_info *abbrev_section)
3101 struct objfile *objfile = dwarf2_per_objfile->objfile;
3103 dwarf2_read_section (objfile, section);
3104 dwarf2_read_section (objfile, abbrev_section);
3106 dwarf2_per_objfile->n_type_units
3107 = dwarf2_per_objfile->n_allocated_type_units
3109 dwarf2_per_objfile->all_type_units
3110 = XNEWVEC (struct signatured_type *, dwarf2_per_objfile->n_type_units);
3112 htab_t sig_types_hash = allocate_signatured_type_table (objfile);
3114 for (uint32_t i = 0; i < map.tu_count; ++i)
3116 struct signatured_type *sig_type;
3119 sect_offset sect_off
3120 = (sect_offset) (extract_unsigned_integer
3121 (map.tu_table_reordered + i * map.offset_size,
3123 map.dwarf5_byte_order));
3125 comp_unit_head cu_header;
3126 read_and_check_comp_unit_head (dwarf2_per_objfile, &cu_header, section,
3128 section->buffer + to_underlying (sect_off),
3131 sig_type = OBSTACK_ZALLOC (&objfile->objfile_obstack,
3132 struct signatured_type);
3133 sig_type->signature = cu_header.signature;
3134 sig_type->type_offset_in_tu = cu_header.type_cu_offset_in_tu;
3135 sig_type->per_cu.is_debug_types = 1;
3136 sig_type->per_cu.section = section;
3137 sig_type->per_cu.sect_off = sect_off;
3138 sig_type->per_cu.dwarf2_per_objfile = dwarf2_per_objfile;
3139 sig_type->per_cu.v.quick
3140 = OBSTACK_ZALLOC (&objfile->objfile_obstack,
3141 struct dwarf2_per_cu_quick_data);
3143 slot = htab_find_slot (sig_types_hash, sig_type, INSERT);
3146 dwarf2_per_objfile->all_type_units[i] = sig_type;
3149 dwarf2_per_objfile->signatured_types = sig_types_hash;
3152 /* Read the address map data from the mapped index, and use it to
3153 populate the objfile's psymtabs_addrmap. */
3156 create_addrmap_from_index (struct dwarf2_per_objfile *dwarf2_per_objfile,
3157 struct mapped_index *index)
3159 struct objfile *objfile = dwarf2_per_objfile->objfile;
3160 struct gdbarch *gdbarch = get_objfile_arch (objfile);
3161 const gdb_byte *iter, *end;
3162 struct addrmap *mutable_map;
3165 auto_obstack temp_obstack;
3167 mutable_map = addrmap_create_mutable (&temp_obstack);
3169 iter = index->address_table.data ();
3170 end = iter + index->address_table.size ();
3172 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
3176 ULONGEST hi, lo, cu_index;
3177 lo = extract_unsigned_integer (iter, 8, BFD_ENDIAN_LITTLE);
3179 hi = extract_unsigned_integer (iter, 8, BFD_ENDIAN_LITTLE);
3181 cu_index = extract_unsigned_integer (iter, 4, BFD_ENDIAN_LITTLE);
3186 complaint (&symfile_complaints,
3187 _(".gdb_index address table has invalid range (%s - %s)"),
3188 hex_string (lo), hex_string (hi));
3192 if (cu_index >= dwarf2_per_objfile->n_comp_units)
3194 complaint (&symfile_complaints,
3195 _(".gdb_index address table has invalid CU number %u"),
3196 (unsigned) cu_index);
3200 lo = gdbarch_adjust_dwarf2_addr (gdbarch, lo + baseaddr);
3201 hi = gdbarch_adjust_dwarf2_addr (gdbarch, hi + baseaddr);
3202 addrmap_set_empty (mutable_map, lo, hi - 1,
3203 dwarf2_per_objfile->get_cu (cu_index));
3206 objfile->psymtabs_addrmap = addrmap_create_fixed (mutable_map,
3207 &objfile->objfile_obstack);
3210 /* Read the address map data from DWARF-5 .debug_aranges, and use it to
3211 populate the objfile's psymtabs_addrmap. */
3214 create_addrmap_from_aranges (struct dwarf2_per_objfile *dwarf2_per_objfile,
3215 struct dwarf2_section_info *section)
3217 struct objfile *objfile = dwarf2_per_objfile->objfile;
3218 bfd *abfd = objfile->obfd;
3219 struct gdbarch *gdbarch = get_objfile_arch (objfile);
3220 const CORE_ADDR baseaddr = ANOFFSET (objfile->section_offsets,
3221 SECT_OFF_TEXT (objfile));
3223 auto_obstack temp_obstack;
3224 addrmap *mutable_map = addrmap_create_mutable (&temp_obstack);
3226 std::unordered_map<sect_offset,
3227 dwarf2_per_cu_data *,
3228 gdb::hash_enum<sect_offset>>
3229 debug_info_offset_to_per_cu;
3230 for (int cui = 0; cui < dwarf2_per_objfile->n_comp_units; ++cui)
3232 dwarf2_per_cu_data *per_cu = dwarf2_per_objfile->get_cu (cui);
3233 const auto insertpair
3234 = debug_info_offset_to_per_cu.emplace (per_cu->sect_off, per_cu);
3235 if (!insertpair.second)
3237 warning (_("Section .debug_aranges in %s has duplicate "
3238 "debug_info_offset %s, ignoring .debug_aranges."),
3239 objfile_name (objfile), sect_offset_str (per_cu->sect_off));
3244 dwarf2_read_section (objfile, section);
3246 const bfd_endian dwarf5_byte_order = gdbarch_byte_order (gdbarch);
3248 const gdb_byte *addr = section->buffer;
3250 while (addr < section->buffer + section->size)
3252 const gdb_byte *const entry_addr = addr;
3253 unsigned int bytes_read;
3255 const LONGEST entry_length = read_initial_length (abfd, addr,
3259 const gdb_byte *const entry_end = addr + entry_length;
3260 const bool dwarf5_is_dwarf64 = bytes_read != 4;
3261 const uint8_t offset_size = dwarf5_is_dwarf64 ? 8 : 4;
3262 if (addr + entry_length > section->buffer + section->size)
3264 warning (_("Section .debug_aranges in %s entry at offset %zu "
3265 "length %s exceeds section length %s, "
3266 "ignoring .debug_aranges."),
3267 objfile_name (objfile), entry_addr - section->buffer,
3268 plongest (bytes_read + entry_length),
3269 pulongest (section->size));
3273 /* The version number. */
3274 const uint16_t version = read_2_bytes (abfd, addr);
3278 warning (_("Section .debug_aranges in %s entry at offset %zu "
3279 "has unsupported version %d, ignoring .debug_aranges."),
3280 objfile_name (objfile), entry_addr - section->buffer,
3285 const uint64_t debug_info_offset
3286 = extract_unsigned_integer (addr, offset_size, dwarf5_byte_order);
3287 addr += offset_size;
3288 const auto per_cu_it
3289 = debug_info_offset_to_per_cu.find (sect_offset (debug_info_offset));
3290 if (per_cu_it == debug_info_offset_to_per_cu.cend ())
3292 warning (_("Section .debug_aranges in %s entry at offset %zu "
3293 "debug_info_offset %s does not exists, "
3294 "ignoring .debug_aranges."),
3295 objfile_name (objfile), entry_addr - section->buffer,
3296 pulongest (debug_info_offset));
3299 dwarf2_per_cu_data *const per_cu = per_cu_it->second;
3301 const uint8_t address_size = *addr++;
3302 if (address_size < 1 || address_size > 8)
3304 warning (_("Section .debug_aranges in %s entry at offset %zu "
3305 "address_size %u is invalid, ignoring .debug_aranges."),
3306 objfile_name (objfile), entry_addr - section->buffer,
3311 const uint8_t segment_selector_size = *addr++;
3312 if (segment_selector_size != 0)
3314 warning (_("Section .debug_aranges in %s entry at offset %zu "
3315 "segment_selector_size %u is not supported, "
3316 "ignoring .debug_aranges."),
3317 objfile_name (objfile), entry_addr - section->buffer,
3318 segment_selector_size);
3322 /* Must pad to an alignment boundary that is twice the address
3323 size. It is undocumented by the DWARF standard but GCC does
3325 for (size_t padding = ((-(addr - section->buffer))
3326 & (2 * address_size - 1));
3327 padding > 0; padding--)
3330 warning (_("Section .debug_aranges in %s entry at offset %zu "
3331 "padding is not zero, ignoring .debug_aranges."),
3332 objfile_name (objfile), entry_addr - section->buffer);
3338 if (addr + 2 * address_size > entry_end)
3340 warning (_("Section .debug_aranges in %s entry at offset %zu "
3341 "address list is not properly terminated, "
3342 "ignoring .debug_aranges."),
3343 objfile_name (objfile), entry_addr - section->buffer);
3346 ULONGEST start = extract_unsigned_integer (addr, address_size,
3348 addr += address_size;
3349 ULONGEST length = extract_unsigned_integer (addr, address_size,
3351 addr += address_size;
3352 if (start == 0 && length == 0)
3354 if (start == 0 && !dwarf2_per_objfile->has_section_at_zero)
3356 /* Symbol was eliminated due to a COMDAT group. */
3359 ULONGEST end = start + length;
3360 start = gdbarch_adjust_dwarf2_addr (gdbarch, start + baseaddr);
3361 end = gdbarch_adjust_dwarf2_addr (gdbarch, end + baseaddr);
3362 addrmap_set_empty (mutable_map, start, end - 1, per_cu);
3366 objfile->psymtabs_addrmap = addrmap_create_fixed (mutable_map,
3367 &objfile->objfile_obstack);
3370 /* Find a slot in the mapped index INDEX for the object named NAME.
3371 If NAME is found, set *VEC_OUT to point to the CU vector in the
3372 constant pool and return true. If NAME cannot be found, return
3376 find_slot_in_mapped_hash (struct mapped_index *index, const char *name,
3377 offset_type **vec_out)
3380 offset_type slot, step;
3381 int (*cmp) (const char *, const char *);
3383 gdb::unique_xmalloc_ptr<char> without_params;
3384 if (current_language->la_language == language_cplus
3385 || current_language->la_language == language_fortran
3386 || current_language->la_language == language_d)
3388 /* NAME is already canonical. Drop any qualifiers as .gdb_index does
3391 if (strchr (name, '(') != NULL)
3393 without_params = cp_remove_params (name);
3395 if (without_params != NULL)
3396 name = without_params.get ();
3400 /* Index version 4 did not support case insensitive searches. But the
3401 indices for case insensitive languages are built in lowercase, therefore
3402 simulate our NAME being searched is also lowercased. */
3403 hash = mapped_index_string_hash ((index->version == 4
3404 && case_sensitivity == case_sensitive_off
3405 ? 5 : index->version),
3408 slot = hash & (index->symbol_table.size () - 1);
3409 step = ((hash * 17) & (index->symbol_table.size () - 1)) | 1;
3410 cmp = (case_sensitivity == case_sensitive_on ? strcmp : strcasecmp);
3416 const auto &bucket = index->symbol_table[slot];
3417 if (bucket.name == 0 && bucket.vec == 0)
3420 str = index->constant_pool + MAYBE_SWAP (bucket.name);
3421 if (!cmp (name, str))
3423 *vec_out = (offset_type *) (index->constant_pool
3424 + MAYBE_SWAP (bucket.vec));
3428 slot = (slot + step) & (index->symbol_table.size () - 1);
3432 /* A helper function that reads the .gdb_index from SECTION and fills
3433 in MAP. FILENAME is the name of the file containing the section;
3434 it is used for error reporting. DEPRECATED_OK is nonzero if it is
3435 ok to use deprecated sections.
3437 CU_LIST, CU_LIST_ELEMENTS, TYPES_LIST, and TYPES_LIST_ELEMENTS are
3438 out parameters that are filled in with information about the CU and
3439 TU lists in the section.
3441 Returns 1 if all went well, 0 otherwise. */
3444 read_index_from_section (struct objfile *objfile,
3445 const char *filename,
3447 struct dwarf2_section_info *section,
3448 struct mapped_index *map,
3449 const gdb_byte **cu_list,
3450 offset_type *cu_list_elements,
3451 const gdb_byte **types_list,
3452 offset_type *types_list_elements)
3454 const gdb_byte *addr;
3455 offset_type version;
3456 offset_type *metadata;
3459 if (dwarf2_section_empty_p (section))
3462 /* Older elfutils strip versions could keep the section in the main
3463 executable while splitting it for the separate debug info file. */
3464 if ((get_section_flags (section) & SEC_HAS_CONTENTS) == 0)
3467 dwarf2_read_section (objfile, section);
3469 addr = section->buffer;
3470 /* Version check. */
3471 version = MAYBE_SWAP (*(offset_type *) addr);
3472 /* Versions earlier than 3 emitted every copy of a psymbol. This
3473 causes the index to behave very poorly for certain requests. Version 3
3474 contained incomplete addrmap. So, it seems better to just ignore such
3478 static int warning_printed = 0;
3479 if (!warning_printed)
3481 warning (_("Skipping obsolete .gdb_index section in %s."),
3483 warning_printed = 1;
3487 /* Index version 4 uses a different hash function than index version
3490 Versions earlier than 6 did not emit psymbols for inlined
3491 functions. Using these files will cause GDB not to be able to
3492 set breakpoints on inlined functions by name, so we ignore these
3493 indices unless the user has done
3494 "set use-deprecated-index-sections on". */
3495 if (version < 6 && !deprecated_ok)
3497 static int warning_printed = 0;
3498 if (!warning_printed)
3501 Skipping deprecated .gdb_index section in %s.\n\
3502 Do \"set use-deprecated-index-sections on\" before the file is read\n\
3503 to use the section anyway."),
3505 warning_printed = 1;
3509 /* Version 7 indices generated by gold refer to the CU for a symbol instead
3510 of the TU (for symbols coming from TUs),
3511 http://sourceware.org/bugzilla/show_bug.cgi?id=15021.
3512 Plus gold-generated indices can have duplicate entries for global symbols,
3513 http://sourceware.org/bugzilla/show_bug.cgi?id=15646.
3514 These are just performance bugs, and we can't distinguish gdb-generated
3515 indices from gold-generated ones, so issue no warning here. */
3517 /* Indexes with higher version than the one supported by GDB may be no
3518 longer backward compatible. */
3522 map->version = version;
3523 map->total_size = section->size;
3525 metadata = (offset_type *) (addr + sizeof (offset_type));
3528 *cu_list = addr + MAYBE_SWAP (metadata[i]);
3529 *cu_list_elements = ((MAYBE_SWAP (metadata[i + 1]) - MAYBE_SWAP (metadata[i]))
3533 *types_list = addr + MAYBE_SWAP (metadata[i]);
3534 *types_list_elements = ((MAYBE_SWAP (metadata[i + 1])
3535 - MAYBE_SWAP (metadata[i]))
3539 const gdb_byte *address_table = addr + MAYBE_SWAP (metadata[i]);
3540 const gdb_byte *address_table_end = addr + MAYBE_SWAP (metadata[i + 1]);
3542 = gdb::array_view<const gdb_byte> (address_table, address_table_end);
3545 const gdb_byte *symbol_table = addr + MAYBE_SWAP (metadata[i]);
3546 const gdb_byte *symbol_table_end = addr + MAYBE_SWAP (metadata[i + 1]);
3548 = gdb::array_view<mapped_index::symbol_table_slot>
3549 ((mapped_index::symbol_table_slot *) symbol_table,
3550 (mapped_index::symbol_table_slot *) symbol_table_end);
3553 map->constant_pool = (char *) (addr + MAYBE_SWAP (metadata[i]));
3558 /* Read .gdb_index. If everything went ok, initialize the "quick"
3559 elements of all the CUs and return 1. Otherwise, return 0. */
3562 dwarf2_read_index (struct objfile *objfile)
3564 struct mapped_index local_map, *map;
3565 const gdb_byte *cu_list, *types_list, *dwz_list = NULL;
3566 offset_type cu_list_elements, types_list_elements, dwz_list_elements = 0;
3567 struct dwz_file *dwz;
3568 struct dwarf2_per_objfile *dwarf2_per_objfile
3569 = get_dwarf2_per_objfile (objfile);
3571 if (!read_index_from_section (objfile, objfile_name (objfile),
3572 use_deprecated_index_sections,
3573 &dwarf2_per_objfile->gdb_index, &local_map,
3574 &cu_list, &cu_list_elements,
3575 &types_list, &types_list_elements))
3578 /* Don't use the index if it's empty. */
3579 if (local_map.symbol_table.empty ())
3582 /* If there is a .dwz file, read it so we can get its CU list as
3584 dwz = dwarf2_get_dwz_file (dwarf2_per_objfile);
3587 struct mapped_index dwz_map;
3588 const gdb_byte *dwz_types_ignore;
3589 offset_type dwz_types_elements_ignore;
3591 if (!read_index_from_section (objfile, bfd_get_filename (dwz->dwz_bfd),
3593 &dwz->gdb_index, &dwz_map,
3594 &dwz_list, &dwz_list_elements,
3596 &dwz_types_elements_ignore))
3598 warning (_("could not read '.gdb_index' section from %s; skipping"),
3599 bfd_get_filename (dwz->dwz_bfd));
3604 create_cus_from_index (objfile, cu_list, cu_list_elements, dwz_list,
3607 if (types_list_elements)
3609 struct dwarf2_section_info *section;
3611 /* We can only handle a single .debug_types when we have an
3613 if (VEC_length (dwarf2_section_info_def, dwarf2_per_objfile->types) != 1)
3616 section = VEC_index (dwarf2_section_info_def,
3617 dwarf2_per_objfile->types, 0);
3619 create_signatured_type_table_from_index (objfile, section, types_list,
3620 types_list_elements);
3623 create_addrmap_from_index (dwarf2_per_objfile, &local_map);
3625 map = XOBNEW (&objfile->objfile_obstack, struct mapped_index);
3626 map = new (map) mapped_index ();
3629 dwarf2_per_objfile->index_table = map;
3630 dwarf2_per_objfile->using_index = 1;
3631 dwarf2_per_objfile->quick_file_names_table =
3632 create_quick_file_names_table (dwarf2_per_objfile->n_comp_units);
3637 /* die_reader_func for dw2_get_file_names. */
3640 dw2_get_file_names_reader (const struct die_reader_specs *reader,
3641 const gdb_byte *info_ptr,
3642 struct die_info *comp_unit_die,
3646 struct dwarf2_cu *cu = reader->cu;
3647 struct dwarf2_per_cu_data *this_cu = cu->per_cu;
3648 struct dwarf2_per_objfile *dwarf2_per_objfile
3649 = cu->per_cu->dwarf2_per_objfile;
3650 struct objfile *objfile = dwarf2_per_objfile->objfile;
3651 struct dwarf2_per_cu_data *lh_cu;
3652 struct attribute *attr;
3655 struct quick_file_names *qfn;
3657 gdb_assert (! this_cu->is_debug_types);
3659 /* Our callers never want to match partial units -- instead they
3660 will match the enclosing full CU. */
3661 if (comp_unit_die->tag == DW_TAG_partial_unit)
3663 this_cu->v.quick->no_file_data = 1;
3671 sect_offset line_offset {};
3673 attr = dwarf2_attr (comp_unit_die, DW_AT_stmt_list, cu);
3676 struct quick_file_names find_entry;
3678 line_offset = (sect_offset) DW_UNSND (attr);
3680 /* We may have already read in this line header (TU line header sharing).
3681 If we have we're done. */
3682 find_entry.hash.dwo_unit = cu->dwo_unit;
3683 find_entry.hash.line_sect_off = line_offset;
3684 slot = htab_find_slot (dwarf2_per_objfile->quick_file_names_table,
3685 &find_entry, INSERT);
3688 lh_cu->v.quick->file_names = (struct quick_file_names *) *slot;
3692 lh = dwarf_decode_line_header (line_offset, cu);
3696 lh_cu->v.quick->no_file_data = 1;
3700 qfn = XOBNEW (&objfile->objfile_obstack, struct quick_file_names);
3701 qfn->hash.dwo_unit = cu->dwo_unit;
3702 qfn->hash.line_sect_off = line_offset;
3703 gdb_assert (slot != NULL);
3706 file_and_directory fnd = find_file_and_directory (comp_unit_die, cu);
3708 qfn->num_file_names = lh->file_names.size ();
3710 XOBNEWVEC (&objfile->objfile_obstack, const char *, lh->file_names.size ());
3711 for (i = 0; i < lh->file_names.size (); ++i)
3712 qfn->file_names[i] = file_full_name (i + 1, lh.get (), fnd.comp_dir);
3713 qfn->real_names = NULL;
3715 lh_cu->v.quick->file_names = qfn;
3718 /* A helper for the "quick" functions which attempts to read the line
3719 table for THIS_CU. */
3721 static struct quick_file_names *
3722 dw2_get_file_names (struct dwarf2_per_cu_data *this_cu)
3724 /* This should never be called for TUs. */
3725 gdb_assert (! this_cu->is_debug_types);
3726 /* Nor type unit groups. */
3727 gdb_assert (! IS_TYPE_UNIT_GROUP (this_cu));
3729 if (this_cu->v.quick->file_names != NULL)
3730 return this_cu->v.quick->file_names;
3731 /* If we know there is no line data, no point in looking again. */
3732 if (this_cu->v.quick->no_file_data)
3735 init_cutu_and_read_dies_simple (this_cu, dw2_get_file_names_reader, NULL);
3737 if (this_cu->v.quick->no_file_data)
3739 return this_cu->v.quick->file_names;
3742 /* A helper for the "quick" functions which computes and caches the
3743 real path for a given file name from the line table. */
3746 dw2_get_real_path (struct objfile *objfile,
3747 struct quick_file_names *qfn, int index)
3749 if (qfn->real_names == NULL)
3750 qfn->real_names = OBSTACK_CALLOC (&objfile->objfile_obstack,
3751 qfn->num_file_names, const char *);
3753 if (qfn->real_names[index] == NULL)
3754 qfn->real_names[index] = gdb_realpath (qfn->file_names[index]).release ();
3756 return qfn->real_names[index];
3759 static struct symtab *
3760 dw2_find_last_source_symtab (struct objfile *objfile)
3762 struct dwarf2_per_objfile *dwarf2_per_objfile
3763 = get_dwarf2_per_objfile (objfile);
3764 int index = dwarf2_per_objfile->n_comp_units - 1;
3765 dwarf2_per_cu_data *dwarf_cu = dwarf2_per_objfile->get_cu (index);
3766 compunit_symtab *cust = dw2_instantiate_symtab (dwarf_cu);
3771 return compunit_primary_filetab (cust);
3774 /* Traversal function for dw2_forget_cached_source_info. */
3777 dw2_free_cached_file_names (void **slot, void *info)
3779 struct quick_file_names *file_data = (struct quick_file_names *) *slot;
3781 if (file_data->real_names)
3785 for (i = 0; i < file_data->num_file_names; ++i)
3787 xfree ((void*) file_data->real_names[i]);
3788 file_data->real_names[i] = NULL;
3796 dw2_forget_cached_source_info (struct objfile *objfile)
3798 struct dwarf2_per_objfile *dwarf2_per_objfile
3799 = get_dwarf2_per_objfile (objfile);
3801 htab_traverse_noresize (dwarf2_per_objfile->quick_file_names_table,
3802 dw2_free_cached_file_names, NULL);
3805 /* Helper function for dw2_map_symtabs_matching_filename that expands
3806 the symtabs and calls the iterator. */
3809 dw2_map_expand_apply (struct objfile *objfile,
3810 struct dwarf2_per_cu_data *per_cu,
3811 const char *name, const char *real_path,
3812 gdb::function_view<bool (symtab *)> callback)
3814 struct compunit_symtab *last_made = objfile->compunit_symtabs;
3816 /* Don't visit already-expanded CUs. */
3817 if (per_cu->v.quick->compunit_symtab)
3820 /* This may expand more than one symtab, and we want to iterate over
3822 dw2_instantiate_symtab (per_cu);
3824 return iterate_over_some_symtabs (name, real_path, objfile->compunit_symtabs,
3825 last_made, callback);
3828 /* Implementation of the map_symtabs_matching_filename method. */
3831 dw2_map_symtabs_matching_filename
3832 (struct objfile *objfile, const char *name, const char *real_path,
3833 gdb::function_view<bool (symtab *)> callback)
3835 const char *name_basename = lbasename (name);
3836 struct dwarf2_per_objfile *dwarf2_per_objfile
3837 = get_dwarf2_per_objfile (objfile);
3839 /* The rule is CUs specify all the files, including those used by
3840 any TU, so there's no need to scan TUs here. */
3842 for (int i = 0; i < dwarf2_per_objfile->n_comp_units; ++i)
3845 dwarf2_per_cu_data *per_cu = dwarf2_per_objfile->get_cu (i);
3846 struct quick_file_names *file_data;
3848 /* We only need to look at symtabs not already expanded. */
3849 if (per_cu->v.quick->compunit_symtab)
3852 file_data = dw2_get_file_names (per_cu);
3853 if (file_data == NULL)
3856 for (j = 0; j < file_data->num_file_names; ++j)
3858 const char *this_name = file_data->file_names[j];
3859 const char *this_real_name;
3861 if (compare_filenames_for_search (this_name, name))
3863 if (dw2_map_expand_apply (objfile, per_cu, name, real_path,
3869 /* Before we invoke realpath, which can get expensive when many
3870 files are involved, do a quick comparison of the basenames. */
3871 if (! basenames_may_differ
3872 && FILENAME_CMP (lbasename (this_name), name_basename) != 0)
3875 this_real_name = dw2_get_real_path (objfile, file_data, j);
3876 if (compare_filenames_for_search (this_real_name, name))
3878 if (dw2_map_expand_apply (objfile, per_cu, name, real_path,
3884 if (real_path != NULL)
3886 gdb_assert (IS_ABSOLUTE_PATH (real_path));
3887 gdb_assert (IS_ABSOLUTE_PATH (name));
3888 if (this_real_name != NULL
3889 && FILENAME_CMP (real_path, this_real_name) == 0)
3891 if (dw2_map_expand_apply (objfile, per_cu, name, real_path,
3903 /* Struct used to manage iterating over all CUs looking for a symbol. */
3905 struct dw2_symtab_iterator
3907 /* The dwarf2_per_objfile owning the CUs we are iterating on. */
3908 struct dwarf2_per_objfile *dwarf2_per_objfile;
3909 /* If non-zero, only look for symbols that match BLOCK_INDEX. */
3910 int want_specific_block;
3911 /* One of GLOBAL_BLOCK or STATIC_BLOCK.
3912 Unused if !WANT_SPECIFIC_BLOCK. */
3914 /* The kind of symbol we're looking for. */
3916 /* The list of CUs from the index entry of the symbol,
3917 or NULL if not found. */
3919 /* The next element in VEC to look at. */
3921 /* The number of elements in VEC, or zero if there is no match. */
3923 /* Have we seen a global version of the symbol?
3924 If so we can ignore all further global instances.
3925 This is to work around gold/15646, inefficient gold-generated
3930 /* Initialize the index symtab iterator ITER.
3931 If WANT_SPECIFIC_BLOCK is non-zero, only look for symbols
3932 in block BLOCK_INDEX. Otherwise BLOCK_INDEX is ignored. */
3935 dw2_symtab_iter_init (struct dw2_symtab_iterator *iter,
3936 struct dwarf2_per_objfile *dwarf2_per_objfile,
3937 int want_specific_block,
3942 iter->dwarf2_per_objfile = dwarf2_per_objfile;
3943 iter->want_specific_block = want_specific_block;
3944 iter->block_index = block_index;
3945 iter->domain = domain;
3947 iter->global_seen = 0;
3949 mapped_index *index = dwarf2_per_objfile->index_table;
3951 /* index is NULL if OBJF_READNOW. */
3952 if (index != NULL && find_slot_in_mapped_hash (index, name, &iter->vec))
3953 iter->length = MAYBE_SWAP (*iter->vec);
3961 /* Return the next matching CU or NULL if there are no more. */
3963 static struct dwarf2_per_cu_data *
3964 dw2_symtab_iter_next (struct dw2_symtab_iterator *iter)
3966 struct dwarf2_per_objfile *dwarf2_per_objfile = iter->dwarf2_per_objfile;
3968 for ( ; iter->next < iter->length; ++iter->next)
3970 offset_type cu_index_and_attrs =
3971 MAYBE_SWAP (iter->vec[iter->next + 1]);
3972 offset_type cu_index = GDB_INDEX_CU_VALUE (cu_index_and_attrs);
3973 int want_static = iter->block_index != GLOBAL_BLOCK;
3974 /* This value is only valid for index versions >= 7. */
3975 int is_static = GDB_INDEX_SYMBOL_STATIC_VALUE (cu_index_and_attrs);
3976 gdb_index_symbol_kind symbol_kind =
3977 GDB_INDEX_SYMBOL_KIND_VALUE (cu_index_and_attrs);
3978 /* Only check the symbol attributes if they're present.
3979 Indices prior to version 7 don't record them,
3980 and indices >= 7 may elide them for certain symbols
3981 (gold does this). */
3983 (dwarf2_per_objfile->index_table->version >= 7
3984 && symbol_kind != GDB_INDEX_SYMBOL_KIND_NONE);
3986 /* Don't crash on bad data. */
3987 if (cu_index >= (dwarf2_per_objfile->n_comp_units
3988 + dwarf2_per_objfile->n_type_units))
3990 complaint (&symfile_complaints,
3991 _(".gdb_index entry has bad CU index"
3993 objfile_name (dwarf2_per_objfile->objfile));
3997 dwarf2_per_cu_data *per_cu = dwarf2_per_objfile->get_cutu (cu_index);
3999 /* Skip if already read in. */
4000 if (per_cu->v.quick->compunit_symtab)
4003 /* Check static vs global. */
4006 if (iter->want_specific_block
4007 && want_static != is_static)
4009 /* Work around gold/15646. */
4010 if (!is_static && iter->global_seen)
4013 iter->global_seen = 1;
4016 /* Only check the symbol's kind if it has one. */
4019 switch (iter->domain)
4022 if (symbol_kind != GDB_INDEX_SYMBOL_KIND_VARIABLE
4023 && symbol_kind != GDB_INDEX_SYMBOL_KIND_FUNCTION
4024 /* Some types are also in VAR_DOMAIN. */
4025 && symbol_kind != GDB_INDEX_SYMBOL_KIND_TYPE)
4029 if (symbol_kind != GDB_INDEX_SYMBOL_KIND_TYPE)
4033 if (symbol_kind != GDB_INDEX_SYMBOL_KIND_OTHER)
4048 static struct compunit_symtab *
4049 dw2_lookup_symbol (struct objfile *objfile, int block_index,
4050 const char *name, domain_enum domain)
4052 struct compunit_symtab *stab_best = NULL;
4053 struct dwarf2_per_objfile *dwarf2_per_objfile
4054 = get_dwarf2_per_objfile (objfile);
4056 lookup_name_info lookup_name (name, symbol_name_match_type::FULL);
4058 struct dw2_symtab_iterator iter;
4059 struct dwarf2_per_cu_data *per_cu;
4061 dw2_symtab_iter_init (&iter, dwarf2_per_objfile, 1, block_index, domain, name);
4063 while ((per_cu = dw2_symtab_iter_next (&iter)) != NULL)
4065 struct symbol *sym, *with_opaque = NULL;
4066 struct compunit_symtab *stab = dw2_instantiate_symtab (per_cu);
4067 const struct blockvector *bv = COMPUNIT_BLOCKVECTOR (stab);
4068 struct block *block = BLOCKVECTOR_BLOCK (bv, block_index);
4070 sym = block_find_symbol (block, name, domain,
4071 block_find_non_opaque_type_preferred,
4074 /* Some caution must be observed with overloaded functions
4075 and methods, since the index will not contain any overload
4076 information (but NAME might contain it). */
4079 && SYMBOL_MATCHES_SEARCH_NAME (sym, lookup_name))
4081 if (with_opaque != NULL
4082 && SYMBOL_MATCHES_SEARCH_NAME (with_opaque, lookup_name))
4085 /* Keep looking through other CUs. */
4092 dw2_print_stats (struct objfile *objfile)
4094 struct dwarf2_per_objfile *dwarf2_per_objfile
4095 = get_dwarf2_per_objfile (objfile);
4096 int total = dwarf2_per_objfile->n_comp_units + dwarf2_per_objfile->n_type_units;
4099 for (int i = 0; i < total; ++i)
4101 dwarf2_per_cu_data *per_cu = dwarf2_per_objfile->get_cutu (i);
4103 if (!per_cu->v.quick->compunit_symtab)
4106 printf_filtered (_(" Number of read CUs: %d\n"), total - count);
4107 printf_filtered (_(" Number of unread CUs: %d\n"), count);
4110 /* This dumps minimal information about the index.
4111 It is called via "mt print objfiles".
4112 One use is to verify .gdb_index has been loaded by the
4113 gdb.dwarf2/gdb-index.exp testcase. */
4116 dw2_dump (struct objfile *objfile)
4118 struct dwarf2_per_objfile *dwarf2_per_objfile
4119 = get_dwarf2_per_objfile (objfile);
4121 gdb_assert (dwarf2_per_objfile->using_index);
4122 printf_filtered (".gdb_index:");
4123 if (dwarf2_per_objfile->index_table != NULL)
4125 printf_filtered (" version %d\n",
4126 dwarf2_per_objfile->index_table->version);
4129 printf_filtered (" faked for \"readnow\"\n");
4130 printf_filtered ("\n");
4134 dw2_relocate (struct objfile *objfile,
4135 const struct section_offsets *new_offsets,
4136 const struct section_offsets *delta)
4138 /* There's nothing to relocate here. */
4142 dw2_expand_symtabs_for_function (struct objfile *objfile,
4143 const char *func_name)
4145 struct dwarf2_per_objfile *dwarf2_per_objfile
4146 = get_dwarf2_per_objfile (objfile);
4148 struct dw2_symtab_iterator iter;
4149 struct dwarf2_per_cu_data *per_cu;
4151 /* Note: It doesn't matter what we pass for block_index here. */
4152 dw2_symtab_iter_init (&iter, dwarf2_per_objfile, 0, GLOBAL_BLOCK, VAR_DOMAIN,
4155 while ((per_cu = dw2_symtab_iter_next (&iter)) != NULL)
4156 dw2_instantiate_symtab (per_cu);
4161 dw2_expand_all_symtabs (struct objfile *objfile)
4163 struct dwarf2_per_objfile *dwarf2_per_objfile
4164 = get_dwarf2_per_objfile (objfile);
4165 int total_units = (dwarf2_per_objfile->n_comp_units
4166 + dwarf2_per_objfile->n_type_units);
4168 for (int i = 0; i < total_units; ++i)
4170 dwarf2_per_cu_data *per_cu = dwarf2_per_objfile->get_cutu (i);
4172 dw2_instantiate_symtab (per_cu);
4177 dw2_expand_symtabs_with_fullname (struct objfile *objfile,
4178 const char *fullname)
4180 struct dwarf2_per_objfile *dwarf2_per_objfile
4181 = get_dwarf2_per_objfile (objfile);
4183 /* We don't need to consider type units here.
4184 This is only called for examining code, e.g. expand_line_sal.
4185 There can be an order of magnitude (or more) more type units
4186 than comp units, and we avoid them if we can. */
4188 for (int i = 0; i < dwarf2_per_objfile->n_comp_units; ++i)
4191 dwarf2_per_cu_data *per_cu = dwarf2_per_objfile->get_cu (i);
4192 struct quick_file_names *file_data;
4194 /* We only need to look at symtabs not already expanded. */
4195 if (per_cu->v.quick->compunit_symtab)
4198 file_data = dw2_get_file_names (per_cu);
4199 if (file_data == NULL)
4202 for (j = 0; j < file_data->num_file_names; ++j)
4204 const char *this_fullname = file_data->file_names[j];
4206 if (filename_cmp (this_fullname, fullname) == 0)
4208 dw2_instantiate_symtab (per_cu);
4216 dw2_map_matching_symbols (struct objfile *objfile,
4217 const char * name, domain_enum domain,
4219 int (*callback) (struct block *,
4220 struct symbol *, void *),
4221 void *data, symbol_name_match_type match,
4222 symbol_compare_ftype *ordered_compare)
4224 /* Currently unimplemented; used for Ada. The function can be called if the
4225 current language is Ada for a non-Ada objfile using GNU index. As Ada
4226 does not look for non-Ada symbols this function should just return. */
4229 /* Symbol name matcher for .gdb_index names.
4231 Symbol names in .gdb_index have a few particularities:
4233 - There's no indication of which is the language of each symbol.
4235 Since each language has its own symbol name matching algorithm,
4236 and we don't know which language is the right one, we must match
4237 each symbol against all languages. This would be a potential
4238 performance problem if it were not mitigated by the
4239 mapped_index::name_components lookup table, which significantly
4240 reduces the number of times we need to call into this matcher,
4241 making it a non-issue.
4243 - Symbol names in the index have no overload (parameter)
4244 information. I.e., in C++, "foo(int)" and "foo(long)" both
4245 appear as "foo" in the index, for example.
4247 This means that the lookup names passed to the symbol name
4248 matcher functions must have no parameter information either
4249 because (e.g.) symbol search name "foo" does not match
4250 lookup-name "foo(int)" [while swapping search name for lookup
4253 class gdb_index_symbol_name_matcher
4256 /* Prepares the vector of comparison functions for LOOKUP_NAME. */
4257 gdb_index_symbol_name_matcher (const lookup_name_info &lookup_name);
4259 /* Walk all the matcher routines and match SYMBOL_NAME against them.
4260 Returns true if any matcher matches. */
4261 bool matches (const char *symbol_name);
4264 /* A reference to the lookup name we're matching against. */
4265 const lookup_name_info &m_lookup_name;
4267 /* A vector holding all the different symbol name matchers, for all
4269 std::vector<symbol_name_matcher_ftype *> m_symbol_name_matcher_funcs;
4272 gdb_index_symbol_name_matcher::gdb_index_symbol_name_matcher
4273 (const lookup_name_info &lookup_name)
4274 : m_lookup_name (lookup_name)
4276 /* Prepare the vector of comparison functions upfront, to avoid
4277 doing the same work for each symbol. Care is taken to avoid
4278 matching with the same matcher more than once if/when multiple
4279 languages use the same matcher function. */
4280 auto &matchers = m_symbol_name_matcher_funcs;
4281 matchers.reserve (nr_languages);
4283 matchers.push_back (default_symbol_name_matcher);
4285 for (int i = 0; i < nr_languages; i++)
4287 const language_defn *lang = language_def ((enum language) i);
4288 symbol_name_matcher_ftype *name_matcher
4289 = get_symbol_name_matcher (lang, m_lookup_name);
4291 /* Don't insert the same comparison routine more than once.
4292 Note that we do this linear walk instead of a seemingly
4293 cheaper sorted insert, or use a std::set or something like
4294 that, because relative order of function addresses is not
4295 stable. This is not a problem in practice because the number
4296 of supported languages is low, and the cost here is tiny
4297 compared to the number of searches we'll do afterwards using
4299 if (name_matcher != default_symbol_name_matcher
4300 && (std::find (matchers.begin (), matchers.end (), name_matcher)
4301 == matchers.end ()))
4302 matchers.push_back (name_matcher);
4307 gdb_index_symbol_name_matcher::matches (const char *symbol_name)
4309 for (auto matches_name : m_symbol_name_matcher_funcs)
4310 if (matches_name (symbol_name, m_lookup_name, NULL))
4316 /* Starting from a search name, return the string that finds the upper
4317 bound of all strings that start with SEARCH_NAME in a sorted name
4318 list. Returns the empty string to indicate that the upper bound is
4319 the end of the list. */
4322 make_sort_after_prefix_name (const char *search_name)
4324 /* When looking to complete "func", we find the upper bound of all
4325 symbols that start with "func" by looking for where we'd insert
4326 the closest string that would follow "func" in lexicographical
4327 order. Usually, that's "func"-with-last-character-incremented,
4328 i.e. "fund". Mind non-ASCII characters, though. Usually those
4329 will be UTF-8 multi-byte sequences, but we can't be certain.
4330 Especially mind the 0xff character, which is a valid character in
4331 non-UTF-8 source character sets (e.g. Latin1 'ÿ'), and we can't
4332 rule out compilers allowing it in identifiers. Note that
4333 conveniently, strcmp/strcasecmp are specified to compare
4334 characters interpreted as unsigned char. So what we do is treat
4335 the whole string as a base 256 number composed of a sequence of
4336 base 256 "digits" and add 1 to it. I.e., adding 1 to 0xff wraps
4337 to 0, and carries 1 to the following more-significant position.
4338 If the very first character in SEARCH_NAME ends up incremented
4339 and carries/overflows, then the upper bound is the end of the
4340 list. The string after the empty string is also the empty
4343 Some examples of this operation:
4345 SEARCH_NAME => "+1" RESULT
4349 "\xff" "a" "\xff" => "\xff" "b"
4354 Then, with these symbols for example:
4360 completing "func" looks for symbols between "func" and
4361 "func"-with-last-character-incremented, i.e. "fund" (exclusive),
4362 which finds "func" and "func1", but not "fund".
4366 funcÿ (Latin1 'ÿ' [0xff])
4370 completing "funcÿ" looks for symbols between "funcÿ" and "fund"
4371 (exclusive), which finds "funcÿ" and "funcÿ1", but not "fund".
4375 ÿÿ (Latin1 'ÿ' [0xff])
4378 completing "ÿ" or "ÿÿ" looks for symbols between between "ÿÿ" and
4379 the end of the list.
4381 std::string after = search_name;
4382 while (!after.empty () && (unsigned char) after.back () == 0xff)
4384 if (!after.empty ())
4385 after.back () = (unsigned char) after.back () + 1;
4389 /* See declaration. */
4391 std::pair<std::vector<name_component>::const_iterator,
4392 std::vector<name_component>::const_iterator>
4393 mapped_index_base::find_name_components_bounds
4394 (const lookup_name_info &lookup_name_without_params) const
4397 = this->name_components_casing == case_sensitive_on ? strcmp : strcasecmp;
4400 = lookup_name_without_params.cplus ().lookup_name ().c_str ();
4402 /* Comparison function object for lower_bound that matches against a
4403 given symbol name. */
4404 auto lookup_compare_lower = [&] (const name_component &elem,
4407 const char *elem_qualified = this->symbol_name_at (elem.idx);
4408 const char *elem_name = elem_qualified + elem.name_offset;
4409 return name_cmp (elem_name, name) < 0;
4412 /* Comparison function object for upper_bound that matches against a
4413 given symbol name. */
4414 auto lookup_compare_upper = [&] (const char *name,
4415 const name_component &elem)
4417 const char *elem_qualified = this->symbol_name_at (elem.idx);
4418 const char *elem_name = elem_qualified + elem.name_offset;
4419 return name_cmp (name, elem_name) < 0;
4422 auto begin = this->name_components.begin ();
4423 auto end = this->name_components.end ();
4425 /* Find the lower bound. */
4428 if (lookup_name_without_params.completion_mode () && cplus[0] == '\0')
4431 return std::lower_bound (begin, end, cplus, lookup_compare_lower);
4434 /* Find the upper bound. */
4437 if (lookup_name_without_params.completion_mode ())
4439 /* In completion mode, we want UPPER to point past all
4440 symbols names that have the same prefix. I.e., with
4441 these symbols, and completing "func":
4443 function << lower bound
4445 other_function << upper bound
4447 We find the upper bound by looking for the insertion
4448 point of "func"-with-last-character-incremented,
4450 std::string after = make_sort_after_prefix_name (cplus);
4453 return std::lower_bound (lower, end, after.c_str (),
4454 lookup_compare_lower);
4457 return std::upper_bound (lower, end, cplus, lookup_compare_upper);
4460 return {lower, upper};
4463 /* See declaration. */
4466 mapped_index_base::build_name_components ()
4468 if (!this->name_components.empty ())
4471 this->name_components_casing = case_sensitivity;
4473 = this->name_components_casing == case_sensitive_on ? strcmp : strcasecmp;
4475 /* The code below only knows how to break apart components of C++
4476 symbol names (and other languages that use '::' as
4477 namespace/module separator). If we add support for wild matching
4478 to some language that uses some other operator (E.g., Ada, Go and
4479 D use '.'), then we'll need to try splitting the symbol name
4480 according to that language too. Note that Ada does support wild
4481 matching, but doesn't currently support .gdb_index. */
4482 auto count = this->symbol_name_count ();
4483 for (offset_type idx = 0; idx < count; idx++)
4485 if (this->symbol_name_slot_invalid (idx))
4488 const char *name = this->symbol_name_at (idx);
4490 /* Add each name component to the name component table. */
4491 unsigned int previous_len = 0;
4492 for (unsigned int current_len = cp_find_first_component (name);
4493 name[current_len] != '\0';
4494 current_len += cp_find_first_component (name + current_len))
4496 gdb_assert (name[current_len] == ':');
4497 this->name_components.push_back ({previous_len, idx});
4498 /* Skip the '::'. */
4500 previous_len = current_len;
4502 this->name_components.push_back ({previous_len, idx});
4505 /* Sort name_components elements by name. */
4506 auto name_comp_compare = [&] (const name_component &left,
4507 const name_component &right)
4509 const char *left_qualified = this->symbol_name_at (left.idx);
4510 const char *right_qualified = this->symbol_name_at (right.idx);
4512 const char *left_name = left_qualified + left.name_offset;
4513 const char *right_name = right_qualified + right.name_offset;
4515 return name_cmp (left_name, right_name) < 0;
4518 std::sort (this->name_components.begin (),
4519 this->name_components.end (),
4523 /* Helper for dw2_expand_symtabs_matching that works with a
4524 mapped_index_base instead of the containing objfile. This is split
4525 to a separate function in order to be able to unit test the
4526 name_components matching using a mock mapped_index_base. For each
4527 symbol name that matches, calls MATCH_CALLBACK, passing it the
4528 symbol's index in the mapped_index_base symbol table. */
4531 dw2_expand_symtabs_matching_symbol
4532 (mapped_index_base &index,
4533 const lookup_name_info &lookup_name_in,
4534 gdb::function_view<expand_symtabs_symbol_matcher_ftype> symbol_matcher,
4535 enum search_domain kind,
4536 gdb::function_view<void (offset_type)> match_callback)
4538 lookup_name_info lookup_name_without_params
4539 = lookup_name_in.make_ignore_params ();
4540 gdb_index_symbol_name_matcher lookup_name_matcher
4541 (lookup_name_without_params);
4543 /* Build the symbol name component sorted vector, if we haven't
4545 index.build_name_components ();
4547 auto bounds = index.find_name_components_bounds (lookup_name_without_params);
4549 /* Now for each symbol name in range, check to see if we have a name
4550 match, and if so, call the MATCH_CALLBACK callback. */
4552 /* The same symbol may appear more than once in the range though.
4553 E.g., if we're looking for symbols that complete "w", and we have
4554 a symbol named "w1::w2", we'll find the two name components for
4555 that same symbol in the range. To be sure we only call the
4556 callback once per symbol, we first collect the symbol name
4557 indexes that matched in a temporary vector and ignore
4559 std::vector<offset_type> matches;
4560 matches.reserve (std::distance (bounds.first, bounds.second));
4562 for (; bounds.first != bounds.second; ++bounds.first)
4564 const char *qualified = index.symbol_name_at (bounds.first->idx);
4566 if (!lookup_name_matcher.matches (qualified)
4567 || (symbol_matcher != NULL && !symbol_matcher (qualified)))
4570 matches.push_back (bounds.first->idx);
4573 std::sort (matches.begin (), matches.end ());
4575 /* Finally call the callback, once per match. */
4577 for (offset_type idx : matches)
4581 match_callback (idx);
4586 /* Above we use a type wider than idx's for 'prev', since 0 and
4587 (offset_type)-1 are both possible values. */
4588 static_assert (sizeof (prev) > sizeof (offset_type), "");
4593 namespace selftests { namespace dw2_expand_symtabs_matching {
4595 /* A mock .gdb_index/.debug_names-like name index table, enough to
4596 exercise dw2_expand_symtabs_matching_symbol, which works with the
4597 mapped_index_base interface. Builds an index from the symbol list
4598 passed as parameter to the constructor. */
4599 class mock_mapped_index : public mapped_index_base
4602 mock_mapped_index (gdb::array_view<const char *> symbols)
4603 : m_symbol_table (symbols)
4606 DISABLE_COPY_AND_ASSIGN (mock_mapped_index);
4608 /* Return the number of names in the symbol table. */
4609 virtual size_t symbol_name_count () const
4611 return m_symbol_table.size ();
4614 /* Get the name of the symbol at IDX in the symbol table. */
4615 virtual const char *symbol_name_at (offset_type idx) const
4617 return m_symbol_table[idx];
4621 gdb::array_view<const char *> m_symbol_table;
4624 /* Convenience function that converts a NULL pointer to a "<null>"
4625 string, to pass to print routines. */
4628 string_or_null (const char *str)
4630 return str != NULL ? str : "<null>";
4633 /* Check if a lookup_name_info built from
4634 NAME/MATCH_TYPE/COMPLETION_MODE matches the symbols in the mock
4635 index. EXPECTED_LIST is the list of expected matches, in expected
4636 matching order. If no match expected, then an empty list is
4637 specified. Returns true on success. On failure prints a warning
4638 indicating the file:line that failed, and returns false. */
4641 check_match (const char *file, int line,
4642 mock_mapped_index &mock_index,
4643 const char *name, symbol_name_match_type match_type,
4644 bool completion_mode,
4645 std::initializer_list<const char *> expected_list)
4647 lookup_name_info lookup_name (name, match_type, completion_mode);
4649 bool matched = true;
4651 auto mismatch = [&] (const char *expected_str,
4654 warning (_("%s:%d: match_type=%s, looking-for=\"%s\", "
4655 "expected=\"%s\", got=\"%s\"\n"),
4657 (match_type == symbol_name_match_type::FULL
4659 name, string_or_null (expected_str), string_or_null (got));
4663 auto expected_it = expected_list.begin ();
4664 auto expected_end = expected_list.end ();
4666 dw2_expand_symtabs_matching_symbol (mock_index, lookup_name,
4668 [&] (offset_type idx)
4670 const char *matched_name = mock_index.symbol_name_at (idx);
4671 const char *expected_str
4672 = expected_it == expected_end ? NULL : *expected_it++;
4674 if (expected_str == NULL || strcmp (expected_str, matched_name) != 0)
4675 mismatch (expected_str, matched_name);
4678 const char *expected_str
4679 = expected_it == expected_end ? NULL : *expected_it++;
4680 if (expected_str != NULL)
4681 mismatch (expected_str, NULL);
4686 /* The symbols added to the mock mapped_index for testing (in
4688 static const char *test_symbols[] = {
4697 "ns2::tmpl<int>::foo2",
4698 "(anonymous namespace)::A::B::C",
4700 /* These are used to check that the increment-last-char in the
4701 matching algorithm for completion doesn't match "t1_fund" when
4702 completing "t1_func". */
4708 /* A UTF-8 name with multi-byte sequences to make sure that
4709 cp-name-parser understands this as a single identifier ("função"
4710 is "function" in PT). */
4713 /* \377 (0xff) is Latin1 'ÿ'. */
4716 /* \377 (0xff) is Latin1 'ÿ'. */
4720 /* A name with all sorts of complications. Starts with "z" to make
4721 it easier for the completion tests below. */
4722 #define Z_SYM_NAME \
4723 "z::std::tuple<(anonymous namespace)::ui*, std::bar<(anonymous namespace)::ui> >" \
4724 "::tuple<(anonymous namespace)::ui*, " \
4725 "std::default_delete<(anonymous namespace)::ui>, void>"
4730 /* Returns true if the mapped_index_base::find_name_component_bounds
4731 method finds EXPECTED_SYMS in INDEX when looking for SEARCH_NAME,
4732 in completion mode. */
4735 check_find_bounds_finds (mapped_index_base &index,
4736 const char *search_name,
4737 gdb::array_view<const char *> expected_syms)
4739 lookup_name_info lookup_name (search_name,
4740 symbol_name_match_type::FULL, true);
4742 auto bounds = index.find_name_components_bounds (lookup_name);
4744 size_t distance = std::distance (bounds.first, bounds.second);
4745 if (distance != expected_syms.size ())
4748 for (size_t exp_elem = 0; exp_elem < distance; exp_elem++)
4750 auto nc_elem = bounds.first + exp_elem;
4751 const char *qualified = index.symbol_name_at (nc_elem->idx);
4752 if (strcmp (qualified, expected_syms[exp_elem]) != 0)
4759 /* Test the lower-level mapped_index::find_name_component_bounds
4763 test_mapped_index_find_name_component_bounds ()
4765 mock_mapped_index mock_index (test_symbols);
4767 mock_index.build_name_components ();
4769 /* Test the lower-level mapped_index::find_name_component_bounds
4770 method in completion mode. */
4772 static const char *expected_syms[] = {
4777 SELF_CHECK (check_find_bounds_finds (mock_index,
4778 "t1_func", expected_syms));
4781 /* Check that the increment-last-char in the name matching algorithm
4782 for completion doesn't get confused with Ansi1 'ÿ' / 0xff. */
4784 static const char *expected_syms1[] = {
4788 SELF_CHECK (check_find_bounds_finds (mock_index,
4789 "\377", expected_syms1));
4791 static const char *expected_syms2[] = {
4794 SELF_CHECK (check_find_bounds_finds (mock_index,
4795 "\377\377", expected_syms2));
4799 /* Test dw2_expand_symtabs_matching_symbol. */
4802 test_dw2_expand_symtabs_matching_symbol ()
4804 mock_mapped_index mock_index (test_symbols);
4806 /* We let all tests run until the end even if some fails, for debug
4808 bool any_mismatch = false;
4810 /* Create the expected symbols list (an initializer_list). Needed
4811 because lists have commas, and we need to pass them to CHECK,
4812 which is a macro. */
4813 #define EXPECT(...) { __VA_ARGS__ }
4815 /* Wrapper for check_match that passes down the current
4816 __FILE__/__LINE__. */
4817 #define CHECK_MATCH(NAME, MATCH_TYPE, COMPLETION_MODE, EXPECTED_LIST) \
4818 any_mismatch |= !check_match (__FILE__, __LINE__, \
4820 NAME, MATCH_TYPE, COMPLETION_MODE, \
4823 /* Identity checks. */
4824 for (const char *sym : test_symbols)
4826 /* Should be able to match all existing symbols. */
4827 CHECK_MATCH (sym, symbol_name_match_type::FULL, false,
4830 /* Should be able to match all existing symbols with
4832 std::string with_params = std::string (sym) + "(int)";
4833 CHECK_MATCH (with_params.c_str (), symbol_name_match_type::FULL, false,
4836 /* Should be able to match all existing symbols with
4837 parameters and qualifiers. */
4838 with_params = std::string (sym) + " ( int ) const";
4839 CHECK_MATCH (with_params.c_str (), symbol_name_match_type::FULL, false,
4842 /* This should really find sym, but cp-name-parser.y doesn't
4843 know about lvalue/rvalue qualifiers yet. */
4844 with_params = std::string (sym) + " ( int ) &&";
4845 CHECK_MATCH (with_params.c_str (), symbol_name_match_type::FULL, false,
4849 /* Check that the name matching algorithm for completion doesn't get
4850 confused with Latin1 'ÿ' / 0xff. */
4852 static const char str[] = "\377";
4853 CHECK_MATCH (str, symbol_name_match_type::FULL, true,
4854 EXPECT ("\377", "\377\377123"));
4857 /* Check that the increment-last-char in the matching algorithm for
4858 completion doesn't match "t1_fund" when completing "t1_func". */
4860 static const char str[] = "t1_func";
4861 CHECK_MATCH (str, symbol_name_match_type::FULL, true,
4862 EXPECT ("t1_func", "t1_func1"));
4865 /* Check that completion mode works at each prefix of the expected
4868 static const char str[] = "function(int)";
4869 size_t len = strlen (str);
4872 for (size_t i = 1; i < len; i++)
4874 lookup.assign (str, i);
4875 CHECK_MATCH (lookup.c_str (), symbol_name_match_type::FULL, true,
4876 EXPECT ("function"));
4880 /* While "w" is a prefix of both components, the match function
4881 should still only be called once. */
4883 CHECK_MATCH ("w", symbol_name_match_type::FULL, true,
4885 CHECK_MATCH ("w", symbol_name_match_type::WILD, true,
4889 /* Same, with a "complicated" symbol. */
4891 static const char str[] = Z_SYM_NAME;
4892 size_t len = strlen (str);
4895 for (size_t i = 1; i < len; i++)
4897 lookup.assign (str, i);
4898 CHECK_MATCH (lookup.c_str (), symbol_name_match_type::FULL, true,
4899 EXPECT (Z_SYM_NAME));
4903 /* In FULL mode, an incomplete symbol doesn't match. */
4905 CHECK_MATCH ("std::zfunction(int", symbol_name_match_type::FULL, false,
4909 /* A complete symbol with parameters matches any overload, since the
4910 index has no overload info. */
4912 CHECK_MATCH ("std::zfunction(int)", symbol_name_match_type::FULL, true,
4913 EXPECT ("std::zfunction", "std::zfunction2"));
4914 CHECK_MATCH ("zfunction(int)", symbol_name_match_type::WILD, true,
4915 EXPECT ("std::zfunction", "std::zfunction2"));
4916 CHECK_MATCH ("zfunc", symbol_name_match_type::WILD, true,
4917 EXPECT ("std::zfunction", "std::zfunction2"));
4920 /* Check that whitespace is ignored appropriately. A symbol with a
4921 template argument list. */
4923 static const char expected[] = "ns::foo<int>";
4924 CHECK_MATCH ("ns :: foo < int > ", symbol_name_match_type::FULL, false,
4926 CHECK_MATCH ("foo < int > ", symbol_name_match_type::WILD, false,
4930 /* Check that whitespace is ignored appropriately. A symbol with a
4931 template argument list that includes a pointer. */
4933 static const char expected[] = "ns::foo<char*>";
4934 /* Try both completion and non-completion modes. */
4935 static const bool completion_mode[2] = {false, true};
4936 for (size_t i = 0; i < 2; i++)
4938 CHECK_MATCH ("ns :: foo < char * >", symbol_name_match_type::FULL,
4939 completion_mode[i], EXPECT (expected));
4940 CHECK_MATCH ("foo < char * >", symbol_name_match_type::WILD,
4941 completion_mode[i], EXPECT (expected));
4943 CHECK_MATCH ("ns :: foo < char * > (int)", symbol_name_match_type::FULL,
4944 completion_mode[i], EXPECT (expected));
4945 CHECK_MATCH ("foo < char * > (int)", symbol_name_match_type::WILD,
4946 completion_mode[i], EXPECT (expected));
4951 /* Check method qualifiers are ignored. */
4952 static const char expected[] = "ns::foo<char*>";
4953 CHECK_MATCH ("ns :: foo < char * > ( int ) const",
4954 symbol_name_match_type::FULL, true, EXPECT (expected));
4955 CHECK_MATCH ("ns :: foo < char * > ( int ) &&",
4956 symbol_name_match_type::FULL, true, EXPECT (expected));
4957 CHECK_MATCH ("foo < char * > ( int ) const",
4958 symbol_name_match_type::WILD, true, EXPECT (expected));
4959 CHECK_MATCH ("foo < char * > ( int ) &&",
4960 symbol_name_match_type::WILD, true, EXPECT (expected));
4963 /* Test lookup names that don't match anything. */
4965 CHECK_MATCH ("bar2", symbol_name_match_type::WILD, false,
4968 CHECK_MATCH ("doesntexist", symbol_name_match_type::FULL, false,
4972 /* Some wild matching tests, exercising "(anonymous namespace)",
4973 which should not be confused with a parameter list. */
4975 static const char *syms[] = {
4979 "A :: B :: C ( int )",
4984 for (const char *s : syms)
4986 CHECK_MATCH (s, symbol_name_match_type::WILD, false,
4987 EXPECT ("(anonymous namespace)::A::B::C"));
4992 static const char expected[] = "ns2::tmpl<int>::foo2";
4993 CHECK_MATCH ("tmp", symbol_name_match_type::WILD, true,
4995 CHECK_MATCH ("tmpl<", symbol_name_match_type::WILD, true,
4999 SELF_CHECK (!any_mismatch);
5008 test_mapped_index_find_name_component_bounds ();
5009 test_dw2_expand_symtabs_matching_symbol ();
5012 }} // namespace selftests::dw2_expand_symtabs_matching
5014 #endif /* GDB_SELF_TEST */
5016 /* If FILE_MATCHER is NULL or if PER_CU has
5017 dwarf2_per_cu_quick_data::MARK set (see
5018 dw_expand_symtabs_matching_file_matcher), expand the CU and call
5019 EXPANSION_NOTIFY on it. */
5022 dw2_expand_symtabs_matching_one
5023 (struct dwarf2_per_cu_data *per_cu,
5024 gdb::function_view<expand_symtabs_file_matcher_ftype> file_matcher,
5025 gdb::function_view<expand_symtabs_exp_notify_ftype> expansion_notify)
5027 if (file_matcher == NULL || per_cu->v.quick->mark)
5029 bool symtab_was_null
5030 = (per_cu->v.quick->compunit_symtab == NULL);
5032 dw2_instantiate_symtab (per_cu);
5034 if (expansion_notify != NULL
5036 && per_cu->v.quick->compunit_symtab != NULL)
5037 expansion_notify (per_cu->v.quick->compunit_symtab);
5041 /* Helper for dw2_expand_matching symtabs. Called on each symbol
5042 matched, to expand corresponding CUs that were marked. IDX is the
5043 index of the symbol name that matched. */
5046 dw2_expand_marked_cus
5047 (struct dwarf2_per_objfile *dwarf2_per_objfile, offset_type idx,
5048 gdb::function_view<expand_symtabs_file_matcher_ftype> file_matcher,
5049 gdb::function_view<expand_symtabs_exp_notify_ftype> expansion_notify,
5052 offset_type *vec, vec_len, vec_idx;
5053 bool global_seen = false;
5054 mapped_index &index = *dwarf2_per_objfile->index_table;
5056 vec = (offset_type *) (index.constant_pool
5057 + MAYBE_SWAP (index.symbol_table[idx].vec));
5058 vec_len = MAYBE_SWAP (vec[0]);
5059 for (vec_idx = 0; vec_idx < vec_len; ++vec_idx)
5061 offset_type cu_index_and_attrs = MAYBE_SWAP (vec[vec_idx + 1]);
5062 /* This value is only valid for index versions >= 7. */
5063 int is_static = GDB_INDEX_SYMBOL_STATIC_VALUE (cu_index_and_attrs);
5064 gdb_index_symbol_kind symbol_kind =
5065 GDB_INDEX_SYMBOL_KIND_VALUE (cu_index_and_attrs);
5066 int cu_index = GDB_INDEX_CU_VALUE (cu_index_and_attrs);
5067 /* Only check the symbol attributes if they're present.
5068 Indices prior to version 7 don't record them,
5069 and indices >= 7 may elide them for certain symbols
5070 (gold does this). */
5073 && symbol_kind != GDB_INDEX_SYMBOL_KIND_NONE);
5075 /* Work around gold/15646. */
5078 if (!is_static && global_seen)
5084 /* Only check the symbol's kind if it has one. */
5089 case VARIABLES_DOMAIN:
5090 if (symbol_kind != GDB_INDEX_SYMBOL_KIND_VARIABLE)
5093 case FUNCTIONS_DOMAIN:
5094 if (symbol_kind != GDB_INDEX_SYMBOL_KIND_FUNCTION)
5098 if (symbol_kind != GDB_INDEX_SYMBOL_KIND_TYPE)
5106 /* Don't crash on bad data. */
5107 if (cu_index >= (dwarf2_per_objfile->n_comp_units
5108 + dwarf2_per_objfile->n_type_units))
5110 complaint (&symfile_complaints,
5111 _(".gdb_index entry has bad CU index"
5113 objfile_name (dwarf2_per_objfile->objfile));
5117 dwarf2_per_cu_data *per_cu = dwarf2_per_objfile->get_cutu (cu_index);
5118 dw2_expand_symtabs_matching_one (per_cu, file_matcher,
5123 /* If FILE_MATCHER is non-NULL, set all the
5124 dwarf2_per_cu_quick_data::MARK of the current DWARF2_PER_OBJFILE
5125 that match FILE_MATCHER. */
5128 dw_expand_symtabs_matching_file_matcher
5129 (struct dwarf2_per_objfile *dwarf2_per_objfile,
5130 gdb::function_view<expand_symtabs_file_matcher_ftype> file_matcher)
5132 if (file_matcher == NULL)
5135 objfile *const objfile = dwarf2_per_objfile->objfile;
5137 htab_up visited_found (htab_create_alloc (10, htab_hash_pointer,
5139 NULL, xcalloc, xfree));
5140 htab_up visited_not_found (htab_create_alloc (10, htab_hash_pointer,
5142 NULL, xcalloc, xfree));
5144 /* The rule is CUs specify all the files, including those used by
5145 any TU, so there's no need to scan TUs here. */
5147 for (int i = 0; i < dwarf2_per_objfile->n_comp_units; ++i)
5150 dwarf2_per_cu_data *per_cu = dwarf2_per_objfile->get_cu (i);
5151 struct quick_file_names *file_data;
5156 per_cu->v.quick->mark = 0;
5158 /* We only need to look at symtabs not already expanded. */
5159 if (per_cu->v.quick->compunit_symtab)
5162 file_data = dw2_get_file_names (per_cu);
5163 if (file_data == NULL)
5166 if (htab_find (visited_not_found.get (), file_data) != NULL)
5168 else if (htab_find (visited_found.get (), file_data) != NULL)
5170 per_cu->v.quick->mark = 1;
5174 for (j = 0; j < file_data->num_file_names; ++j)
5176 const char *this_real_name;
5178 if (file_matcher (file_data->file_names[j], false))
5180 per_cu->v.quick->mark = 1;
5184 /* Before we invoke realpath, which can get expensive when many
5185 files are involved, do a quick comparison of the basenames. */
5186 if (!basenames_may_differ
5187 && !file_matcher (lbasename (file_data->file_names[j]),
5191 this_real_name = dw2_get_real_path (objfile, file_data, j);
5192 if (file_matcher (this_real_name, false))
5194 per_cu->v.quick->mark = 1;
5199 slot = htab_find_slot (per_cu->v.quick->mark
5200 ? visited_found.get ()
5201 : visited_not_found.get (),
5208 dw2_expand_symtabs_matching
5209 (struct objfile *objfile,
5210 gdb::function_view<expand_symtabs_file_matcher_ftype> file_matcher,
5211 const lookup_name_info &lookup_name,
5212 gdb::function_view<expand_symtabs_symbol_matcher_ftype> symbol_matcher,
5213 gdb::function_view<expand_symtabs_exp_notify_ftype> expansion_notify,
5214 enum search_domain kind)
5216 struct dwarf2_per_objfile *dwarf2_per_objfile
5217 = get_dwarf2_per_objfile (objfile);
5219 /* index_table is NULL if OBJF_READNOW. */
5220 if (!dwarf2_per_objfile->index_table)
5223 dw_expand_symtabs_matching_file_matcher (dwarf2_per_objfile, file_matcher);
5225 mapped_index &index = *dwarf2_per_objfile->index_table;
5227 dw2_expand_symtabs_matching_symbol (index, lookup_name,
5229 kind, [&] (offset_type idx)
5231 dw2_expand_marked_cus (dwarf2_per_objfile, idx, file_matcher,
5232 expansion_notify, kind);
5236 /* A helper for dw2_find_pc_sect_compunit_symtab which finds the most specific
5239 static struct compunit_symtab *
5240 recursively_find_pc_sect_compunit_symtab (struct compunit_symtab *cust,
5245 if (COMPUNIT_BLOCKVECTOR (cust) != NULL
5246 && blockvector_contains_pc (COMPUNIT_BLOCKVECTOR (cust), pc))
5249 if (cust->includes == NULL)
5252 for (i = 0; cust->includes[i]; ++i)
5254 struct compunit_symtab *s = cust->includes[i];
5256 s = recursively_find_pc_sect_compunit_symtab (s, pc);
5264 static struct compunit_symtab *
5265 dw2_find_pc_sect_compunit_symtab (struct objfile *objfile,
5266 struct bound_minimal_symbol msymbol,
5268 struct obj_section *section,
5271 struct dwarf2_per_cu_data *data;
5272 struct compunit_symtab *result;
5274 if (!objfile->psymtabs_addrmap)
5277 data = (struct dwarf2_per_cu_data *) addrmap_find (objfile->psymtabs_addrmap,
5282 if (warn_if_readin && data->v.quick->compunit_symtab)
5283 warning (_("(Internal error: pc %s in read in CU, but not in symtab.)"),
5284 paddress (get_objfile_arch (objfile), pc));
5287 = recursively_find_pc_sect_compunit_symtab (dw2_instantiate_symtab (data),
5289 gdb_assert (result != NULL);
5294 dw2_map_symbol_filenames (struct objfile *objfile, symbol_filename_ftype *fun,
5295 void *data, int need_fullname)
5297 struct dwarf2_per_objfile *dwarf2_per_objfile
5298 = get_dwarf2_per_objfile (objfile);
5300 if (!dwarf2_per_objfile->filenames_cache)
5302 dwarf2_per_objfile->filenames_cache.emplace ();
5304 htab_up visited (htab_create_alloc (10,
5305 htab_hash_pointer, htab_eq_pointer,
5306 NULL, xcalloc, xfree));
5308 /* The rule is CUs specify all the files, including those used
5309 by any TU, so there's no need to scan TUs here. We can
5310 ignore file names coming from already-expanded CUs. */
5312 for (int i = 0; i < dwarf2_per_objfile->n_comp_units; ++i)
5314 dwarf2_per_cu_data *per_cu = dwarf2_per_objfile->get_cu (i);
5316 if (per_cu->v.quick->compunit_symtab)
5318 void **slot = htab_find_slot (visited.get (),
5319 per_cu->v.quick->file_names,
5322 *slot = per_cu->v.quick->file_names;
5326 for (int i = 0; i < dwarf2_per_objfile->n_comp_units; ++i)
5328 dwarf2_per_cu_data *per_cu = dwarf2_per_objfile->get_cu (i);
5329 struct quick_file_names *file_data;
5332 /* We only need to look at symtabs not already expanded. */
5333 if (per_cu->v.quick->compunit_symtab)
5336 file_data = dw2_get_file_names (per_cu);
5337 if (file_data == NULL)
5340 slot = htab_find_slot (visited.get (), file_data, INSERT);
5343 /* Already visited. */
5348 for (int j = 0; j < file_data->num_file_names; ++j)
5350 const char *filename = file_data->file_names[j];
5351 dwarf2_per_objfile->filenames_cache->seen (filename);
5356 dwarf2_per_objfile->filenames_cache->traverse ([&] (const char *filename)
5358 gdb::unique_xmalloc_ptr<char> this_real_name;
5361 this_real_name = gdb_realpath (filename);
5362 (*fun) (filename, this_real_name.get (), data);
5367 dw2_has_symbols (struct objfile *objfile)
5372 const struct quick_symbol_functions dwarf2_gdb_index_functions =
5375 dw2_find_last_source_symtab,
5376 dw2_forget_cached_source_info,
5377 dw2_map_symtabs_matching_filename,
5382 dw2_expand_symtabs_for_function,
5383 dw2_expand_all_symtabs,
5384 dw2_expand_symtabs_with_fullname,
5385 dw2_map_matching_symbols,
5386 dw2_expand_symtabs_matching,
5387 dw2_find_pc_sect_compunit_symtab,
5389 dw2_map_symbol_filenames
5392 /* DWARF-5 debug_names reader. */
5394 /* DWARF-5 augmentation string for GDB's DW_IDX_GNU_* extension. */
5395 static const gdb_byte dwarf5_augmentation[] = { 'G', 'D', 'B', 0 };
5397 /* A helper function that reads the .debug_names section in SECTION
5398 and fills in MAP. FILENAME is the name of the file containing the
5399 section; it is used for error reporting.
5401 Returns true if all went well, false otherwise. */
5404 read_debug_names_from_section (struct objfile *objfile,
5405 const char *filename,
5406 struct dwarf2_section_info *section,
5407 mapped_debug_names &map)
5409 if (dwarf2_section_empty_p (section))
5412 /* Older elfutils strip versions could keep the section in the main
5413 executable while splitting it for the separate debug info file. */
5414 if ((get_section_flags (section) & SEC_HAS_CONTENTS) == 0)
5417 dwarf2_read_section (objfile, section);
5419 map.dwarf5_byte_order = gdbarch_byte_order (get_objfile_arch (objfile));
5421 const gdb_byte *addr = section->buffer;
5423 bfd *const abfd = get_section_bfd_owner (section);
5425 unsigned int bytes_read;
5426 LONGEST length = read_initial_length (abfd, addr, &bytes_read);
5429 map.dwarf5_is_dwarf64 = bytes_read != 4;
5430 map.offset_size = map.dwarf5_is_dwarf64 ? 8 : 4;
5431 if (bytes_read + length != section->size)
5433 /* There may be multiple per-CU indices. */
5434 warning (_("Section .debug_names in %s length %s does not match "
5435 "section length %s, ignoring .debug_names."),
5436 filename, plongest (bytes_read + length),
5437 pulongest (section->size));
5441 /* The version number. */
5442 uint16_t version = read_2_bytes (abfd, addr);
5446 warning (_("Section .debug_names in %s has unsupported version %d, "
5447 "ignoring .debug_names."),
5453 uint16_t padding = read_2_bytes (abfd, addr);
5457 warning (_("Section .debug_names in %s has unsupported padding %d, "
5458 "ignoring .debug_names."),
5463 /* comp_unit_count - The number of CUs in the CU list. */
5464 map.cu_count = read_4_bytes (abfd, addr);
5467 /* local_type_unit_count - The number of TUs in the local TU
5469 map.tu_count = read_4_bytes (abfd, addr);
5472 /* foreign_type_unit_count - The number of TUs in the foreign TU
5474 uint32_t foreign_tu_count = read_4_bytes (abfd, addr);
5476 if (foreign_tu_count != 0)
5478 warning (_("Section .debug_names in %s has unsupported %lu foreign TUs, "
5479 "ignoring .debug_names."),
5480 filename, static_cast<unsigned long> (foreign_tu_count));
5484 /* bucket_count - The number of hash buckets in the hash lookup
5486 map.bucket_count = read_4_bytes (abfd, addr);
5489 /* name_count - The number of unique names in the index. */
5490 map.name_count = read_4_bytes (abfd, addr);
5493 /* abbrev_table_size - The size in bytes of the abbreviations
5495 uint32_t abbrev_table_size = read_4_bytes (abfd, addr);
5498 /* augmentation_string_size - The size in bytes of the augmentation
5499 string. This value is rounded up to a multiple of 4. */
5500 uint32_t augmentation_string_size = read_4_bytes (abfd, addr);
5502 map.augmentation_is_gdb = ((augmentation_string_size
5503 == sizeof (dwarf5_augmentation))
5504 && memcmp (addr, dwarf5_augmentation,
5505 sizeof (dwarf5_augmentation)) == 0);
5506 augmentation_string_size += (-augmentation_string_size) & 3;
5507 addr += augmentation_string_size;
5510 map.cu_table_reordered = addr;
5511 addr += map.cu_count * map.offset_size;
5513 /* List of Local TUs */
5514 map.tu_table_reordered = addr;
5515 addr += map.tu_count * map.offset_size;
5517 /* Hash Lookup Table */
5518 map.bucket_table_reordered = reinterpret_cast<const uint32_t *> (addr);
5519 addr += map.bucket_count * 4;
5520 map.hash_table_reordered = reinterpret_cast<const uint32_t *> (addr);
5521 addr += map.name_count * 4;
5524 map.name_table_string_offs_reordered = addr;
5525 addr += map.name_count * map.offset_size;
5526 map.name_table_entry_offs_reordered = addr;
5527 addr += map.name_count * map.offset_size;
5529 const gdb_byte *abbrev_table_start = addr;
5532 unsigned int bytes_read;
5533 const ULONGEST index_num = read_unsigned_leb128 (abfd, addr, &bytes_read);
5538 const auto insertpair
5539 = map.abbrev_map.emplace (index_num, mapped_debug_names::index_val ());
5540 if (!insertpair.second)
5542 warning (_("Section .debug_names in %s has duplicate index %s, "
5543 "ignoring .debug_names."),
5544 filename, pulongest (index_num));
5547 mapped_debug_names::index_val &indexval = insertpair.first->second;
5548 indexval.dwarf_tag = read_unsigned_leb128 (abfd, addr, &bytes_read);
5553 mapped_debug_names::index_val::attr attr;
5554 attr.dw_idx = read_unsigned_leb128 (abfd, addr, &bytes_read);
5556 attr.form = read_unsigned_leb128 (abfd, addr, &bytes_read);
5558 if (attr.form == DW_FORM_implicit_const)
5560 attr.implicit_const = read_signed_leb128 (abfd, addr,
5564 if (attr.dw_idx == 0 && attr.form == 0)
5566 indexval.attr_vec.push_back (std::move (attr));
5569 if (addr != abbrev_table_start + abbrev_table_size)
5571 warning (_("Section .debug_names in %s has abbreviation_table "
5572 "of size %zu vs. written as %u, ignoring .debug_names."),
5573 filename, addr - abbrev_table_start, abbrev_table_size);
5576 map.entry_pool = addr;
5581 /* A helper for create_cus_from_debug_names that handles the MAP's CU
5585 create_cus_from_debug_names_list (struct dwarf2_per_objfile *dwarf2_per_objfile,
5586 const mapped_debug_names &map,
5587 dwarf2_section_info §ion,
5588 bool is_dwz, int base_offset)
5590 sect_offset sect_off_prev;
5591 for (uint32_t i = 0; i <= map.cu_count; ++i)
5593 sect_offset sect_off_next;
5594 if (i < map.cu_count)
5597 = (sect_offset) (extract_unsigned_integer
5598 (map.cu_table_reordered + i * map.offset_size,
5600 map.dwarf5_byte_order));
5603 sect_off_next = (sect_offset) section.size;
5606 const ULONGEST length = sect_off_next - sect_off_prev;
5607 dwarf2_per_objfile->all_comp_units[base_offset + (i - 1)]
5608 = create_cu_from_index_list (dwarf2_per_objfile, §ion, is_dwz,
5609 sect_off_prev, length);
5611 sect_off_prev = sect_off_next;
5615 /* Read the CU list from the mapped index, and use it to create all
5616 the CU objects for this dwarf2_per_objfile. */
5619 create_cus_from_debug_names (struct dwarf2_per_objfile *dwarf2_per_objfile,
5620 const mapped_debug_names &map,
5621 const mapped_debug_names &dwz_map)
5623 struct objfile *objfile = dwarf2_per_objfile->objfile;
5625 dwarf2_per_objfile->n_comp_units = map.cu_count + dwz_map.cu_count;
5626 dwarf2_per_objfile->all_comp_units
5627 = XOBNEWVEC (&objfile->objfile_obstack, struct dwarf2_per_cu_data *,
5628 dwarf2_per_objfile->n_comp_units);
5630 create_cus_from_debug_names_list (dwarf2_per_objfile, map,
5631 dwarf2_per_objfile->info,
5633 0 /* base_offset */);
5635 if (dwz_map.cu_count == 0)
5638 dwz_file *dwz = dwarf2_get_dwz_file (dwarf2_per_objfile);
5639 create_cus_from_debug_names_list (dwarf2_per_objfile, dwz_map, dwz->info,
5641 map.cu_count /* base_offset */);
5644 /* Read .debug_names. If everything went ok, initialize the "quick"
5645 elements of all the CUs and return true. Otherwise, return false. */
5648 dwarf2_read_debug_names (struct dwarf2_per_objfile *dwarf2_per_objfile)
5650 mapped_debug_names local_map (dwarf2_per_objfile);
5651 mapped_debug_names dwz_map (dwarf2_per_objfile);
5652 struct objfile *objfile = dwarf2_per_objfile->objfile;
5654 if (!read_debug_names_from_section (objfile, objfile_name (objfile),
5655 &dwarf2_per_objfile->debug_names,
5659 /* Don't use the index if it's empty. */
5660 if (local_map.name_count == 0)
5663 /* If there is a .dwz file, read it so we can get its CU list as
5665 dwz_file *dwz = dwarf2_get_dwz_file (dwarf2_per_objfile);
5668 if (!read_debug_names_from_section (objfile,
5669 bfd_get_filename (dwz->dwz_bfd),
5670 &dwz->debug_names, dwz_map))
5672 warning (_("could not read '.debug_names' section from %s; skipping"),
5673 bfd_get_filename (dwz->dwz_bfd));
5678 create_cus_from_debug_names (dwarf2_per_objfile, local_map, dwz_map);
5680 if (local_map.tu_count != 0)
5682 /* We can only handle a single .debug_types when we have an
5684 if (VEC_length (dwarf2_section_info_def, dwarf2_per_objfile->types) != 1)
5687 dwarf2_section_info *section = VEC_index (dwarf2_section_info_def,
5688 dwarf2_per_objfile->types, 0);
5690 create_signatured_type_table_from_debug_names
5691 (dwarf2_per_objfile, local_map, section, &dwarf2_per_objfile->abbrev);
5694 create_addrmap_from_aranges (dwarf2_per_objfile,
5695 &dwarf2_per_objfile->debug_aranges);
5697 dwarf2_per_objfile->debug_names_table.reset
5698 (new mapped_debug_names (dwarf2_per_objfile));
5699 *dwarf2_per_objfile->debug_names_table = std::move (local_map);
5700 dwarf2_per_objfile->using_index = 1;
5701 dwarf2_per_objfile->quick_file_names_table =
5702 create_quick_file_names_table (dwarf2_per_objfile->n_comp_units);
5707 /* Type used to manage iterating over all CUs looking for a symbol for
5710 class dw2_debug_names_iterator
5713 /* If WANT_SPECIFIC_BLOCK is true, only look for symbols in block
5714 BLOCK_INDEX. Otherwise BLOCK_INDEX is ignored. */
5715 dw2_debug_names_iterator (const mapped_debug_names &map,
5716 bool want_specific_block,
5717 block_enum block_index, domain_enum domain,
5719 : m_map (map), m_want_specific_block (want_specific_block),
5720 m_block_index (block_index), m_domain (domain),
5721 m_addr (find_vec_in_debug_names (map, name))
5724 dw2_debug_names_iterator (const mapped_debug_names &map,
5725 search_domain search, uint32_t namei)
5728 m_addr (find_vec_in_debug_names (map, namei))
5731 /* Return the next matching CU or NULL if there are no more. */
5732 dwarf2_per_cu_data *next ();
5735 static const gdb_byte *find_vec_in_debug_names (const mapped_debug_names &map,
5737 static const gdb_byte *find_vec_in_debug_names (const mapped_debug_names &map,
5740 /* The internalized form of .debug_names. */
5741 const mapped_debug_names &m_map;
5743 /* If true, only look for symbols that match BLOCK_INDEX. */
5744 const bool m_want_specific_block = false;
5746 /* One of GLOBAL_BLOCK or STATIC_BLOCK.
5747 Unused if !WANT_SPECIFIC_BLOCK - FIRST_LOCAL_BLOCK is an invalid
5749 const block_enum m_block_index = FIRST_LOCAL_BLOCK;
5751 /* The kind of symbol we're looking for. */
5752 const domain_enum m_domain = UNDEF_DOMAIN;
5753 const search_domain m_search = ALL_DOMAIN;
5755 /* The list of CUs from the index entry of the symbol, or NULL if
5757 const gdb_byte *m_addr;
5761 mapped_debug_names::namei_to_name (uint32_t namei) const
5763 const ULONGEST namei_string_offs
5764 = extract_unsigned_integer ((name_table_string_offs_reordered
5765 + namei * offset_size),
5768 return read_indirect_string_at_offset
5769 (dwarf2_per_objfile, dwarf2_per_objfile->objfile->obfd, namei_string_offs);
5772 /* Find a slot in .debug_names for the object named NAME. If NAME is
5773 found, return pointer to its pool data. If NAME cannot be found,
5777 dw2_debug_names_iterator::find_vec_in_debug_names
5778 (const mapped_debug_names &map, const char *name)
5780 int (*cmp) (const char *, const char *);
5782 if (current_language->la_language == language_cplus
5783 || current_language->la_language == language_fortran
5784 || current_language->la_language == language_d)
5786 /* NAME is already canonical. Drop any qualifiers as
5787 .debug_names does not contain any. */
5789 if (strchr (name, '(') != NULL)
5791 gdb::unique_xmalloc_ptr<char> without_params
5792 = cp_remove_params (name);
5794 if (without_params != NULL)
5796 name = without_params.get();
5801 cmp = (case_sensitivity == case_sensitive_on ? strcmp : strcasecmp);
5803 const uint32_t full_hash = dwarf5_djb_hash (name);
5805 = extract_unsigned_integer (reinterpret_cast<const gdb_byte *>
5806 (map.bucket_table_reordered
5807 + (full_hash % map.bucket_count)), 4,
5808 map.dwarf5_byte_order);
5812 if (namei >= map.name_count)
5814 complaint (&symfile_complaints,
5815 _("Wrong .debug_names with name index %u but name_count=%u "
5817 namei, map.name_count,
5818 objfile_name (map.dwarf2_per_objfile->objfile));
5824 const uint32_t namei_full_hash
5825 = extract_unsigned_integer (reinterpret_cast<const gdb_byte *>
5826 (map.hash_table_reordered + namei), 4,
5827 map.dwarf5_byte_order);
5828 if (full_hash % map.bucket_count != namei_full_hash % map.bucket_count)
5831 if (full_hash == namei_full_hash)
5833 const char *const namei_string = map.namei_to_name (namei);
5835 #if 0 /* An expensive sanity check. */
5836 if (namei_full_hash != dwarf5_djb_hash (namei_string))
5838 complaint (&symfile_complaints,
5839 _("Wrong .debug_names hash for string at index %u "
5841 namei, objfile_name (dwarf2_per_objfile->objfile));
5846 if (cmp (namei_string, name) == 0)
5848 const ULONGEST namei_entry_offs
5849 = extract_unsigned_integer ((map.name_table_entry_offs_reordered
5850 + namei * map.offset_size),
5851 map.offset_size, map.dwarf5_byte_order);
5852 return map.entry_pool + namei_entry_offs;
5857 if (namei >= map.name_count)
5863 dw2_debug_names_iterator::find_vec_in_debug_names
5864 (const mapped_debug_names &map, uint32_t namei)
5866 if (namei >= map.name_count)
5868 complaint (&symfile_complaints,
5869 _("Wrong .debug_names with name index %u but name_count=%u "
5871 namei, map.name_count,
5872 objfile_name (map.dwarf2_per_objfile->objfile));
5876 const ULONGEST namei_entry_offs
5877 = extract_unsigned_integer ((map.name_table_entry_offs_reordered
5878 + namei * map.offset_size),
5879 map.offset_size, map.dwarf5_byte_order);
5880 return map.entry_pool + namei_entry_offs;
5883 /* See dw2_debug_names_iterator. */
5885 dwarf2_per_cu_data *
5886 dw2_debug_names_iterator::next ()
5891 struct dwarf2_per_objfile *dwarf2_per_objfile = m_map.dwarf2_per_objfile;
5892 struct objfile *objfile = dwarf2_per_objfile->objfile;
5893 bfd *const abfd = objfile->obfd;
5897 unsigned int bytes_read;
5898 const ULONGEST abbrev = read_unsigned_leb128 (abfd, m_addr, &bytes_read);
5899 m_addr += bytes_read;
5903 const auto indexval_it = m_map.abbrev_map.find (abbrev);
5904 if (indexval_it == m_map.abbrev_map.cend ())
5906 complaint (&symfile_complaints,
5907 _("Wrong .debug_names undefined abbrev code %s "
5909 pulongest (abbrev), objfile_name (objfile));
5912 const mapped_debug_names::index_val &indexval = indexval_it->second;
5913 bool have_is_static = false;
5915 dwarf2_per_cu_data *per_cu = NULL;
5916 for (const mapped_debug_names::index_val::attr &attr : indexval.attr_vec)
5921 case DW_FORM_implicit_const:
5922 ull = attr.implicit_const;
5924 case DW_FORM_flag_present:
5928 ull = read_unsigned_leb128 (abfd, m_addr, &bytes_read);
5929 m_addr += bytes_read;
5932 complaint (&symfile_complaints,
5933 _("Unsupported .debug_names form %s [in module %s]"),
5934 dwarf_form_name (attr.form),
5935 objfile_name (objfile));
5938 switch (attr.dw_idx)
5940 case DW_IDX_compile_unit:
5941 /* Don't crash on bad data. */
5942 if (ull >= dwarf2_per_objfile->n_comp_units)
5944 complaint (&symfile_complaints,
5945 _(".debug_names entry has bad CU index %s"
5948 objfile_name (dwarf2_per_objfile->objfile));
5951 per_cu = dwarf2_per_objfile->get_cutu (ull);
5953 case DW_IDX_type_unit:
5954 /* Don't crash on bad data. */
5955 if (ull >= dwarf2_per_objfile->n_type_units)
5957 complaint (&symfile_complaints,
5958 _(".debug_names entry has bad TU index %s"
5961 objfile_name (dwarf2_per_objfile->objfile));
5964 per_cu = &dwarf2_per_objfile->get_tu (ull)->per_cu;
5966 case DW_IDX_GNU_internal:
5967 if (!m_map.augmentation_is_gdb)
5969 have_is_static = true;
5972 case DW_IDX_GNU_external:
5973 if (!m_map.augmentation_is_gdb)
5975 have_is_static = true;
5981 /* Skip if already read in. */
5982 if (per_cu->v.quick->compunit_symtab)
5985 /* Check static vs global. */
5988 const bool want_static = m_block_index != GLOBAL_BLOCK;
5989 if (m_want_specific_block && want_static != is_static)
5993 /* Match dw2_symtab_iter_next, symbol_kind
5994 and debug_names::psymbol_tag. */
5998 switch (indexval.dwarf_tag)
6000 case DW_TAG_variable:
6001 case DW_TAG_subprogram:
6002 /* Some types are also in VAR_DOMAIN. */
6003 case DW_TAG_typedef:
6004 case DW_TAG_structure_type:
6011 switch (indexval.dwarf_tag)
6013 case DW_TAG_typedef:
6014 case DW_TAG_structure_type:
6021 switch (indexval.dwarf_tag)
6024 case DW_TAG_variable:
6034 /* Match dw2_expand_symtabs_matching, symbol_kind and
6035 debug_names::psymbol_tag. */
6038 case VARIABLES_DOMAIN:
6039 switch (indexval.dwarf_tag)
6041 case DW_TAG_variable:
6047 case FUNCTIONS_DOMAIN:
6048 switch (indexval.dwarf_tag)
6050 case DW_TAG_subprogram:
6057 switch (indexval.dwarf_tag)
6059 case DW_TAG_typedef:
6060 case DW_TAG_structure_type:
6073 static struct compunit_symtab *
6074 dw2_debug_names_lookup_symbol (struct objfile *objfile, int block_index_int,
6075 const char *name, domain_enum domain)
6077 const block_enum block_index = static_cast<block_enum> (block_index_int);
6078 struct dwarf2_per_objfile *dwarf2_per_objfile
6079 = get_dwarf2_per_objfile (objfile);
6081 const auto &mapp = dwarf2_per_objfile->debug_names_table;
6084 /* index is NULL if OBJF_READNOW. */
6087 const auto &map = *mapp;
6089 dw2_debug_names_iterator iter (map, true /* want_specific_block */,
6090 block_index, domain, name);
6092 struct compunit_symtab *stab_best = NULL;
6093 struct dwarf2_per_cu_data *per_cu;
6094 while ((per_cu = iter.next ()) != NULL)
6096 struct symbol *sym, *with_opaque = NULL;
6097 struct compunit_symtab *stab = dw2_instantiate_symtab (per_cu);
6098 const struct blockvector *bv = COMPUNIT_BLOCKVECTOR (stab);
6099 struct block *block = BLOCKVECTOR_BLOCK (bv, block_index);
6101 sym = block_find_symbol (block, name, domain,
6102 block_find_non_opaque_type_preferred,
6105 /* Some caution must be observed with overloaded functions and
6106 methods, since the index will not contain any overload
6107 information (but NAME might contain it). */
6110 && strcmp_iw (SYMBOL_SEARCH_NAME (sym), name) == 0)
6112 if (with_opaque != NULL
6113 && strcmp_iw (SYMBOL_SEARCH_NAME (with_opaque), name) == 0)
6116 /* Keep looking through other CUs. */
6122 /* This dumps minimal information about .debug_names. It is called
6123 via "mt print objfiles". The gdb.dwarf2/gdb-index.exp testcase
6124 uses this to verify that .debug_names has been loaded. */
6127 dw2_debug_names_dump (struct objfile *objfile)
6129 struct dwarf2_per_objfile *dwarf2_per_objfile
6130 = get_dwarf2_per_objfile (objfile);
6132 gdb_assert (dwarf2_per_objfile->using_index);
6133 printf_filtered (".debug_names:");
6134 if (dwarf2_per_objfile->debug_names_table)
6135 printf_filtered (" exists\n");
6137 printf_filtered (" faked for \"readnow\"\n");
6138 printf_filtered ("\n");
6142 dw2_debug_names_expand_symtabs_for_function (struct objfile *objfile,
6143 const char *func_name)
6145 struct dwarf2_per_objfile *dwarf2_per_objfile
6146 = get_dwarf2_per_objfile (objfile);
6148 /* dwarf2_per_objfile->debug_names_table is NULL if OBJF_READNOW. */
6149 if (dwarf2_per_objfile->debug_names_table)
6151 const mapped_debug_names &map = *dwarf2_per_objfile->debug_names_table;
6153 /* Note: It doesn't matter what we pass for block_index here. */
6154 dw2_debug_names_iterator iter (map, false /* want_specific_block */,
6155 GLOBAL_BLOCK, VAR_DOMAIN, func_name);
6157 struct dwarf2_per_cu_data *per_cu;
6158 while ((per_cu = iter.next ()) != NULL)
6159 dw2_instantiate_symtab (per_cu);
6164 dw2_debug_names_expand_symtabs_matching
6165 (struct objfile *objfile,
6166 gdb::function_view<expand_symtabs_file_matcher_ftype> file_matcher,
6167 const lookup_name_info &lookup_name,
6168 gdb::function_view<expand_symtabs_symbol_matcher_ftype> symbol_matcher,
6169 gdb::function_view<expand_symtabs_exp_notify_ftype> expansion_notify,
6170 enum search_domain kind)
6172 struct dwarf2_per_objfile *dwarf2_per_objfile
6173 = get_dwarf2_per_objfile (objfile);
6175 /* debug_names_table is NULL if OBJF_READNOW. */
6176 if (!dwarf2_per_objfile->debug_names_table)
6179 dw_expand_symtabs_matching_file_matcher (dwarf2_per_objfile, file_matcher);
6181 mapped_debug_names &map = *dwarf2_per_objfile->debug_names_table;
6183 dw2_expand_symtabs_matching_symbol (map, lookup_name,
6185 kind, [&] (offset_type namei)
6187 /* The name was matched, now expand corresponding CUs that were
6189 dw2_debug_names_iterator iter (map, kind, namei);
6191 struct dwarf2_per_cu_data *per_cu;
6192 while ((per_cu = iter.next ()) != NULL)
6193 dw2_expand_symtabs_matching_one (per_cu, file_matcher,
6198 const struct quick_symbol_functions dwarf2_debug_names_functions =
6201 dw2_find_last_source_symtab,
6202 dw2_forget_cached_source_info,
6203 dw2_map_symtabs_matching_filename,
6204 dw2_debug_names_lookup_symbol,
6206 dw2_debug_names_dump,
6208 dw2_debug_names_expand_symtabs_for_function,
6209 dw2_expand_all_symtabs,
6210 dw2_expand_symtabs_with_fullname,
6211 dw2_map_matching_symbols,
6212 dw2_debug_names_expand_symtabs_matching,
6213 dw2_find_pc_sect_compunit_symtab,
6215 dw2_map_symbol_filenames
6218 /* See symfile.h. */
6221 dwarf2_initialize_objfile (struct objfile *objfile, dw_index_kind *index_kind)
6223 struct dwarf2_per_objfile *dwarf2_per_objfile
6224 = get_dwarf2_per_objfile (objfile);
6226 /* If we're about to read full symbols, don't bother with the
6227 indices. In this case we also don't care if some other debug
6228 format is making psymtabs, because they are all about to be
6230 if ((objfile->flags & OBJF_READNOW))
6234 dwarf2_per_objfile->using_index = 1;
6235 create_all_comp_units (dwarf2_per_objfile);
6236 create_all_type_units (dwarf2_per_objfile);
6237 dwarf2_per_objfile->quick_file_names_table =
6238 create_quick_file_names_table (dwarf2_per_objfile->n_comp_units);
6240 for (i = 0; i < (dwarf2_per_objfile->n_comp_units
6241 + dwarf2_per_objfile->n_type_units); ++i)
6243 dwarf2_per_cu_data *per_cu = dwarf2_per_objfile->get_cutu (i);
6245 per_cu->v.quick = OBSTACK_ZALLOC (&objfile->objfile_obstack,
6246 struct dwarf2_per_cu_quick_data);
6249 /* Return 1 so that gdb sees the "quick" functions. However,
6250 these functions will be no-ops because we will have expanded
6252 *index_kind = dw_index_kind::GDB_INDEX;
6256 if (dwarf2_read_debug_names (dwarf2_per_objfile))
6258 *index_kind = dw_index_kind::DEBUG_NAMES;
6262 if (dwarf2_read_index (objfile))
6264 *index_kind = dw_index_kind::GDB_INDEX;
6273 /* Build a partial symbol table. */
6276 dwarf2_build_psymtabs (struct objfile *objfile)
6278 struct dwarf2_per_objfile *dwarf2_per_objfile
6279 = get_dwarf2_per_objfile (objfile);
6281 if (objfile->global_psymbols.capacity () == 0
6282 && objfile->static_psymbols.capacity () == 0)
6283 init_psymbol_list (objfile, 1024);
6287 /* This isn't really ideal: all the data we allocate on the
6288 objfile's obstack is still uselessly kept around. However,
6289 freeing it seems unsafe. */
6290 psymtab_discarder psymtabs (objfile);
6291 dwarf2_build_psymtabs_hard (dwarf2_per_objfile);
6294 CATCH (except, RETURN_MASK_ERROR)
6296 exception_print (gdb_stderr, except);
6301 /* Return the total length of the CU described by HEADER. */
6304 get_cu_length (const struct comp_unit_head *header)
6306 return header->initial_length_size + header->length;
6309 /* Return TRUE if SECT_OFF is within CU_HEADER. */
6312 offset_in_cu_p (const comp_unit_head *cu_header, sect_offset sect_off)
6314 sect_offset bottom = cu_header->sect_off;
6315 sect_offset top = cu_header->sect_off + get_cu_length (cu_header);
6317 return sect_off >= bottom && sect_off < top;
6320 /* Find the base address of the compilation unit for range lists and
6321 location lists. It will normally be specified by DW_AT_low_pc.
6322 In DWARF-3 draft 4, the base address could be overridden by
6323 DW_AT_entry_pc. It's been removed, but GCC still uses this for
6324 compilation units with discontinuous ranges. */
6327 dwarf2_find_base_address (struct die_info *die, struct dwarf2_cu *cu)
6329 struct attribute *attr;
6332 cu->base_address = 0;
6334 attr = dwarf2_attr (die, DW_AT_entry_pc, cu);
6337 cu->base_address = attr_value_as_address (attr);
6342 attr = dwarf2_attr (die, DW_AT_low_pc, cu);
6345 cu->base_address = attr_value_as_address (attr);
6351 /* Read in the comp unit header information from the debug_info at info_ptr.
6352 Use rcuh_kind::COMPILE as the default type if not known by the caller.
6353 NOTE: This leaves members offset, first_die_offset to be filled in
6356 static const gdb_byte *
6357 read_comp_unit_head (struct comp_unit_head *cu_header,
6358 const gdb_byte *info_ptr,
6359 struct dwarf2_section_info *section,
6360 rcuh_kind section_kind)
6363 unsigned int bytes_read;
6364 const char *filename = get_section_file_name (section);
6365 bfd *abfd = get_section_bfd_owner (section);
6367 cu_header->length = read_initial_length (abfd, info_ptr, &bytes_read);
6368 cu_header->initial_length_size = bytes_read;
6369 cu_header->offset_size = (bytes_read == 4) ? 4 : 8;
6370 info_ptr += bytes_read;
6371 cu_header->version = read_2_bytes (abfd, info_ptr);
6373 if (cu_header->version < 5)
6374 switch (section_kind)
6376 case rcuh_kind::COMPILE:
6377 cu_header->unit_type = DW_UT_compile;
6379 case rcuh_kind::TYPE:
6380 cu_header->unit_type = DW_UT_type;
6383 internal_error (__FILE__, __LINE__,
6384 _("read_comp_unit_head: invalid section_kind"));
6388 cu_header->unit_type = static_cast<enum dwarf_unit_type>
6389 (read_1_byte (abfd, info_ptr));
6391 switch (cu_header->unit_type)
6394 if (section_kind != rcuh_kind::COMPILE)
6395 error (_("Dwarf Error: wrong unit_type in compilation unit header "
6396 "(is DW_UT_compile, should be DW_UT_type) [in module %s]"),
6400 section_kind = rcuh_kind::TYPE;
6403 error (_("Dwarf Error: wrong unit_type in compilation unit header "
6404 "(is %d, should be %d or %d) [in module %s]"),
6405 cu_header->unit_type, DW_UT_compile, DW_UT_type, filename);
6408 cu_header->addr_size = read_1_byte (abfd, info_ptr);
6411 cu_header->abbrev_sect_off = (sect_offset) read_offset (abfd, info_ptr,
6414 info_ptr += bytes_read;
6415 if (cu_header->version < 5)
6417 cu_header->addr_size = read_1_byte (abfd, info_ptr);
6420 signed_addr = bfd_get_sign_extend_vma (abfd);
6421 if (signed_addr < 0)
6422 internal_error (__FILE__, __LINE__,
6423 _("read_comp_unit_head: dwarf from non elf file"));
6424 cu_header->signed_addr_p = signed_addr;
6426 if (section_kind == rcuh_kind::TYPE)
6428 LONGEST type_offset;
6430 cu_header->signature = read_8_bytes (abfd, info_ptr);
6433 type_offset = read_offset (abfd, info_ptr, cu_header, &bytes_read);
6434 info_ptr += bytes_read;
6435 cu_header->type_cu_offset_in_tu = (cu_offset) type_offset;
6436 if (to_underlying (cu_header->type_cu_offset_in_tu) != type_offset)
6437 error (_("Dwarf Error: Too big type_offset in compilation unit "
6438 "header (is %s) [in module %s]"), plongest (type_offset),
6445 /* Helper function that returns the proper abbrev section for
6448 static struct dwarf2_section_info *
6449 get_abbrev_section_for_cu (struct dwarf2_per_cu_data *this_cu)
6451 struct dwarf2_section_info *abbrev;
6452 struct dwarf2_per_objfile *dwarf2_per_objfile = this_cu->dwarf2_per_objfile;
6454 if (this_cu->is_dwz)
6455 abbrev = &dwarf2_get_dwz_file (dwarf2_per_objfile)->abbrev;
6457 abbrev = &dwarf2_per_objfile->abbrev;
6462 /* Subroutine of read_and_check_comp_unit_head and
6463 read_and_check_type_unit_head to simplify them.
6464 Perform various error checking on the header. */
6467 error_check_comp_unit_head (struct dwarf2_per_objfile *dwarf2_per_objfile,
6468 struct comp_unit_head *header,
6469 struct dwarf2_section_info *section,
6470 struct dwarf2_section_info *abbrev_section)
6472 const char *filename = get_section_file_name (section);
6474 if (header->version < 2 || header->version > 5)
6475 error (_("Dwarf Error: wrong version in compilation unit header "
6476 "(is %d, should be 2, 3, 4 or 5) [in module %s]"), header->version,
6479 if (to_underlying (header->abbrev_sect_off)
6480 >= dwarf2_section_size (dwarf2_per_objfile->objfile, abbrev_section))
6481 error (_("Dwarf Error: bad offset (%s) in compilation unit header "
6482 "(offset %s + 6) [in module %s]"),
6483 sect_offset_str (header->abbrev_sect_off),
6484 sect_offset_str (header->sect_off),
6487 /* Cast to ULONGEST to use 64-bit arithmetic when possible to
6488 avoid potential 32-bit overflow. */
6489 if (((ULONGEST) header->sect_off + get_cu_length (header))
6491 error (_("Dwarf Error: bad length (0x%x) in compilation unit header "
6492 "(offset %s + 0) [in module %s]"),
6493 header->length, sect_offset_str (header->sect_off),
6497 /* Read in a CU/TU header and perform some basic error checking.
6498 The contents of the header are stored in HEADER.
6499 The result is a pointer to the start of the first DIE. */
6501 static const gdb_byte *
6502 read_and_check_comp_unit_head (struct dwarf2_per_objfile *dwarf2_per_objfile,
6503 struct comp_unit_head *header,
6504 struct dwarf2_section_info *section,
6505 struct dwarf2_section_info *abbrev_section,
6506 const gdb_byte *info_ptr,
6507 rcuh_kind section_kind)
6509 const gdb_byte *beg_of_comp_unit = info_ptr;
6511 header->sect_off = (sect_offset) (beg_of_comp_unit - section->buffer);
6513 info_ptr = read_comp_unit_head (header, info_ptr, section, section_kind);
6515 header->first_die_cu_offset = (cu_offset) (info_ptr - beg_of_comp_unit);
6517 error_check_comp_unit_head (dwarf2_per_objfile, header, section,
6523 /* Fetch the abbreviation table offset from a comp or type unit header. */
6526 read_abbrev_offset (struct dwarf2_per_objfile *dwarf2_per_objfile,
6527 struct dwarf2_section_info *section,
6528 sect_offset sect_off)
6530 bfd *abfd = get_section_bfd_owner (section);
6531 const gdb_byte *info_ptr;
6532 unsigned int initial_length_size, offset_size;
6535 dwarf2_read_section (dwarf2_per_objfile->objfile, section);
6536 info_ptr = section->buffer + to_underlying (sect_off);
6537 read_initial_length (abfd, info_ptr, &initial_length_size);
6538 offset_size = initial_length_size == 4 ? 4 : 8;
6539 info_ptr += initial_length_size;
6541 version = read_2_bytes (abfd, info_ptr);
6545 /* Skip unit type and address size. */
6549 return (sect_offset) read_offset_1 (abfd, info_ptr, offset_size);
6552 /* Allocate a new partial symtab for file named NAME and mark this new
6553 partial symtab as being an include of PST. */
6556 dwarf2_create_include_psymtab (const char *name, struct partial_symtab *pst,
6557 struct objfile *objfile)
6559 struct partial_symtab *subpst = allocate_psymtab (name, objfile);
6561 if (!IS_ABSOLUTE_PATH (subpst->filename))
6563 /* It shares objfile->objfile_obstack. */
6564 subpst->dirname = pst->dirname;
6567 subpst->textlow = 0;
6568 subpst->texthigh = 0;
6570 subpst->dependencies
6571 = XOBNEW (&objfile->objfile_obstack, struct partial_symtab *);
6572 subpst->dependencies[0] = pst;
6573 subpst->number_of_dependencies = 1;
6575 subpst->globals_offset = 0;
6576 subpst->n_global_syms = 0;
6577 subpst->statics_offset = 0;
6578 subpst->n_static_syms = 0;
6579 subpst->compunit_symtab = NULL;
6580 subpst->read_symtab = pst->read_symtab;
6583 /* No private part is necessary for include psymtabs. This property
6584 can be used to differentiate between such include psymtabs and
6585 the regular ones. */
6586 subpst->read_symtab_private = NULL;
6589 /* Read the Line Number Program data and extract the list of files
6590 included by the source file represented by PST. Build an include
6591 partial symtab for each of these included files. */
6594 dwarf2_build_include_psymtabs (struct dwarf2_cu *cu,
6595 struct die_info *die,
6596 struct partial_symtab *pst)
6599 struct attribute *attr;
6601 attr = dwarf2_attr (die, DW_AT_stmt_list, cu);
6603 lh = dwarf_decode_line_header ((sect_offset) DW_UNSND (attr), cu);
6605 return; /* No linetable, so no includes. */
6607 /* NOTE: pst->dirname is DW_AT_comp_dir (if present). */
6608 dwarf_decode_lines (lh.get (), pst->dirname, cu, pst, pst->textlow, 1);
6612 hash_signatured_type (const void *item)
6614 const struct signatured_type *sig_type
6615 = (const struct signatured_type *) item;
6617 /* This drops the top 32 bits of the signature, but is ok for a hash. */
6618 return sig_type->signature;
6622 eq_signatured_type (const void *item_lhs, const void *item_rhs)
6624 const struct signatured_type *lhs = (const struct signatured_type *) item_lhs;
6625 const struct signatured_type *rhs = (const struct signatured_type *) item_rhs;
6627 return lhs->signature == rhs->signature;
6630 /* Allocate a hash table for signatured types. */
6633 allocate_signatured_type_table (struct objfile *objfile)
6635 return htab_create_alloc_ex (41,
6636 hash_signatured_type,
6639 &objfile->objfile_obstack,
6640 hashtab_obstack_allocate,
6641 dummy_obstack_deallocate);
6644 /* A helper function to add a signatured type CU to a table. */
6647 add_signatured_type_cu_to_table (void **slot, void *datum)
6649 struct signatured_type *sigt = (struct signatured_type *) *slot;
6650 struct signatured_type ***datap = (struct signatured_type ***) datum;
6658 /* A helper for create_debug_types_hash_table. Read types from SECTION
6659 and fill them into TYPES_HTAB. It will process only type units,
6660 therefore DW_UT_type. */
6663 create_debug_type_hash_table (struct dwarf2_per_objfile *dwarf2_per_objfile,
6664 struct dwo_file *dwo_file,
6665 dwarf2_section_info *section, htab_t &types_htab,
6666 rcuh_kind section_kind)
6668 struct objfile *objfile = dwarf2_per_objfile->objfile;
6669 struct dwarf2_section_info *abbrev_section;
6671 const gdb_byte *info_ptr, *end_ptr;
6673 abbrev_section = (dwo_file != NULL
6674 ? &dwo_file->sections.abbrev
6675 : &dwarf2_per_objfile->abbrev);
6677 if (dwarf_read_debug)
6678 fprintf_unfiltered (gdb_stdlog, "Reading %s for %s:\n",
6679 get_section_name (section),
6680 get_section_file_name (abbrev_section));
6682 dwarf2_read_section (objfile, section);
6683 info_ptr = section->buffer;
6685 if (info_ptr == NULL)
6688 /* We can't set abfd until now because the section may be empty or
6689 not present, in which case the bfd is unknown. */
6690 abfd = get_section_bfd_owner (section);
6692 /* We don't use init_cutu_and_read_dies_simple, or some such, here
6693 because we don't need to read any dies: the signature is in the
6696 end_ptr = info_ptr + section->size;
6697 while (info_ptr < end_ptr)
6699 struct signatured_type *sig_type;
6700 struct dwo_unit *dwo_tu;
6702 const gdb_byte *ptr = info_ptr;
6703 struct comp_unit_head header;
6704 unsigned int length;
6706 sect_offset sect_off = (sect_offset) (ptr - section->buffer);
6708 /* Initialize it due to a false compiler warning. */
6709 header.signature = -1;
6710 header.type_cu_offset_in_tu = (cu_offset) -1;
6712 /* We need to read the type's signature in order to build the hash
6713 table, but we don't need anything else just yet. */
6715 ptr = read_and_check_comp_unit_head (dwarf2_per_objfile, &header, section,
6716 abbrev_section, ptr, section_kind);
6718 length = get_cu_length (&header);
6720 /* Skip dummy type units. */
6721 if (ptr >= info_ptr + length
6722 || peek_abbrev_code (abfd, ptr) == 0
6723 || header.unit_type != DW_UT_type)
6729 if (types_htab == NULL)
6732 types_htab = allocate_dwo_unit_table (objfile);
6734 types_htab = allocate_signatured_type_table (objfile);
6740 dwo_tu = OBSTACK_ZALLOC (&objfile->objfile_obstack,
6742 dwo_tu->dwo_file = dwo_file;
6743 dwo_tu->signature = header.signature;
6744 dwo_tu->type_offset_in_tu = header.type_cu_offset_in_tu;
6745 dwo_tu->section = section;
6746 dwo_tu->sect_off = sect_off;
6747 dwo_tu->length = length;
6751 /* N.B.: type_offset is not usable if this type uses a DWO file.
6752 The real type_offset is in the DWO file. */
6754 sig_type = OBSTACK_ZALLOC (&objfile->objfile_obstack,
6755 struct signatured_type);
6756 sig_type->signature = header.signature;
6757 sig_type->type_offset_in_tu = header.type_cu_offset_in_tu;
6758 sig_type->per_cu.dwarf2_per_objfile = dwarf2_per_objfile;
6759 sig_type->per_cu.is_debug_types = 1;
6760 sig_type->per_cu.section = section;
6761 sig_type->per_cu.sect_off = sect_off;
6762 sig_type->per_cu.length = length;
6765 slot = htab_find_slot (types_htab,
6766 dwo_file ? (void*) dwo_tu : (void *) sig_type,
6768 gdb_assert (slot != NULL);
6771 sect_offset dup_sect_off;
6775 const struct dwo_unit *dup_tu
6776 = (const struct dwo_unit *) *slot;
6778 dup_sect_off = dup_tu->sect_off;
6782 const struct signatured_type *dup_tu
6783 = (const struct signatured_type *) *slot;
6785 dup_sect_off = dup_tu->per_cu.sect_off;
6788 complaint (&symfile_complaints,
6789 _("debug type entry at offset %s is duplicate to"
6790 " the entry at offset %s, signature %s"),
6791 sect_offset_str (sect_off), sect_offset_str (dup_sect_off),
6792 hex_string (header.signature));
6794 *slot = dwo_file ? (void *) dwo_tu : (void *) sig_type;
6796 if (dwarf_read_debug > 1)
6797 fprintf_unfiltered (gdb_stdlog, " offset %s, signature %s\n",
6798 sect_offset_str (sect_off),
6799 hex_string (header.signature));
6805 /* Create the hash table of all entries in the .debug_types
6806 (or .debug_types.dwo) section(s).
6807 If reading a DWO file, then DWO_FILE is a pointer to the DWO file object,
6808 otherwise it is NULL.
6810 The result is a pointer to the hash table or NULL if there are no types.
6812 Note: This function processes DWO files only, not DWP files. */
6815 create_debug_types_hash_table (struct dwarf2_per_objfile *dwarf2_per_objfile,
6816 struct dwo_file *dwo_file,
6817 VEC (dwarf2_section_info_def) *types,
6821 struct dwarf2_section_info *section;
6823 if (VEC_empty (dwarf2_section_info_def, types))
6827 VEC_iterate (dwarf2_section_info_def, types, ix, section);
6829 create_debug_type_hash_table (dwarf2_per_objfile, dwo_file, section,
6830 types_htab, rcuh_kind::TYPE);
6833 /* Create the hash table of all entries in the .debug_types section,
6834 and initialize all_type_units.
6835 The result is zero if there is an error (e.g. missing .debug_types section),
6836 otherwise non-zero. */
6839 create_all_type_units (struct dwarf2_per_objfile *dwarf2_per_objfile)
6841 htab_t types_htab = NULL;
6842 struct signatured_type **iter;
6844 create_debug_type_hash_table (dwarf2_per_objfile, NULL,
6845 &dwarf2_per_objfile->info, types_htab,
6846 rcuh_kind::COMPILE);
6847 create_debug_types_hash_table (dwarf2_per_objfile, NULL,
6848 dwarf2_per_objfile->types, types_htab);
6849 if (types_htab == NULL)
6851 dwarf2_per_objfile->signatured_types = NULL;
6855 dwarf2_per_objfile->signatured_types = types_htab;
6857 dwarf2_per_objfile->n_type_units
6858 = dwarf2_per_objfile->n_allocated_type_units
6859 = htab_elements (types_htab);
6860 dwarf2_per_objfile->all_type_units =
6861 XNEWVEC (struct signatured_type *, dwarf2_per_objfile->n_type_units);
6862 iter = &dwarf2_per_objfile->all_type_units[0];
6863 htab_traverse_noresize (types_htab, add_signatured_type_cu_to_table, &iter);
6864 gdb_assert (iter - &dwarf2_per_objfile->all_type_units[0]
6865 == dwarf2_per_objfile->n_type_units);
6870 /* Add an entry for signature SIG to dwarf2_per_objfile->signatured_types.
6871 If SLOT is non-NULL, it is the entry to use in the hash table.
6872 Otherwise we find one. */
6874 static struct signatured_type *
6875 add_type_unit (struct dwarf2_per_objfile *dwarf2_per_objfile, ULONGEST sig,
6878 struct objfile *objfile = dwarf2_per_objfile->objfile;
6879 int n_type_units = dwarf2_per_objfile->n_type_units;
6880 struct signatured_type *sig_type;
6882 gdb_assert (n_type_units <= dwarf2_per_objfile->n_allocated_type_units);
6884 if (n_type_units > dwarf2_per_objfile->n_allocated_type_units)
6886 if (dwarf2_per_objfile->n_allocated_type_units == 0)
6887 dwarf2_per_objfile->n_allocated_type_units = 1;
6888 dwarf2_per_objfile->n_allocated_type_units *= 2;
6889 dwarf2_per_objfile->all_type_units
6890 = XRESIZEVEC (struct signatured_type *,
6891 dwarf2_per_objfile->all_type_units,
6892 dwarf2_per_objfile->n_allocated_type_units);
6893 ++dwarf2_per_objfile->tu_stats.nr_all_type_units_reallocs;
6895 dwarf2_per_objfile->n_type_units = n_type_units;
6897 sig_type = OBSTACK_ZALLOC (&objfile->objfile_obstack,
6898 struct signatured_type);
6899 dwarf2_per_objfile->all_type_units[n_type_units - 1] = sig_type;
6900 sig_type->signature = sig;
6901 sig_type->per_cu.is_debug_types = 1;
6902 if (dwarf2_per_objfile->using_index)
6904 sig_type->per_cu.v.quick =
6905 OBSTACK_ZALLOC (&objfile->objfile_obstack,
6906 struct dwarf2_per_cu_quick_data);
6911 slot = htab_find_slot (dwarf2_per_objfile->signatured_types,
6914 gdb_assert (*slot == NULL);
6916 /* The rest of sig_type must be filled in by the caller. */
6920 /* Subroutine of lookup_dwo_signatured_type and lookup_dwp_signatured_type.
6921 Fill in SIG_ENTRY with DWO_ENTRY. */
6924 fill_in_sig_entry_from_dwo_entry (struct dwarf2_per_objfile *dwarf2_per_objfile,
6925 struct signatured_type *sig_entry,
6926 struct dwo_unit *dwo_entry)
6928 /* Make sure we're not clobbering something we don't expect to. */
6929 gdb_assert (! sig_entry->per_cu.queued);
6930 gdb_assert (sig_entry->per_cu.cu == NULL);
6931 if (dwarf2_per_objfile->using_index)
6933 gdb_assert (sig_entry->per_cu.v.quick != NULL);
6934 gdb_assert (sig_entry->per_cu.v.quick->compunit_symtab == NULL);
6937 gdb_assert (sig_entry->per_cu.v.psymtab == NULL);
6938 gdb_assert (sig_entry->signature == dwo_entry->signature);
6939 gdb_assert (to_underlying (sig_entry->type_offset_in_section) == 0);
6940 gdb_assert (sig_entry->type_unit_group == NULL);
6941 gdb_assert (sig_entry->dwo_unit == NULL);
6943 sig_entry->per_cu.section = dwo_entry->section;
6944 sig_entry->per_cu.sect_off = dwo_entry->sect_off;
6945 sig_entry->per_cu.length = dwo_entry->length;
6946 sig_entry->per_cu.reading_dwo_directly = 1;
6947 sig_entry->per_cu.dwarf2_per_objfile = dwarf2_per_objfile;
6948 sig_entry->type_offset_in_tu = dwo_entry->type_offset_in_tu;
6949 sig_entry->dwo_unit = dwo_entry;
6952 /* Subroutine of lookup_signatured_type.
6953 If we haven't read the TU yet, create the signatured_type data structure
6954 for a TU to be read in directly from a DWO file, bypassing the stub.
6955 This is the "Stay in DWO Optimization": When there is no DWP file and we're
6956 using .gdb_index, then when reading a CU we want to stay in the DWO file
6957 containing that CU. Otherwise we could end up reading several other DWO
6958 files (due to comdat folding) to process the transitive closure of all the
6959 mentioned TUs, and that can be slow. The current DWO file will have every
6960 type signature that it needs.
6961 We only do this for .gdb_index because in the psymtab case we already have
6962 to read all the DWOs to build the type unit groups. */
6964 static struct signatured_type *
6965 lookup_dwo_signatured_type (struct dwarf2_cu *cu, ULONGEST sig)
6967 struct dwarf2_per_objfile *dwarf2_per_objfile
6968 = cu->per_cu->dwarf2_per_objfile;
6969 struct objfile *objfile = dwarf2_per_objfile->objfile;
6970 struct dwo_file *dwo_file;
6971 struct dwo_unit find_dwo_entry, *dwo_entry;
6972 struct signatured_type find_sig_entry, *sig_entry;
6975 gdb_assert (cu->dwo_unit && dwarf2_per_objfile->using_index);
6977 /* If TU skeletons have been removed then we may not have read in any
6979 if (dwarf2_per_objfile->signatured_types == NULL)
6981 dwarf2_per_objfile->signatured_types
6982 = allocate_signatured_type_table (objfile);
6985 /* We only ever need to read in one copy of a signatured type.
6986 Use the global signatured_types array to do our own comdat-folding
6987 of types. If this is the first time we're reading this TU, and
6988 the TU has an entry in .gdb_index, replace the recorded data from
6989 .gdb_index with this TU. */
6991 find_sig_entry.signature = sig;
6992 slot = htab_find_slot (dwarf2_per_objfile->signatured_types,
6993 &find_sig_entry, INSERT);
6994 sig_entry = (struct signatured_type *) *slot;
6996 /* We can get here with the TU already read, *or* in the process of being
6997 read. Don't reassign the global entry to point to this DWO if that's
6998 the case. Also note that if the TU is already being read, it may not
6999 have come from a DWO, the program may be a mix of Fission-compiled
7000 code and non-Fission-compiled code. */
7002 /* Have we already tried to read this TU?
7003 Note: sig_entry can be NULL if the skeleton TU was removed (thus it
7004 needn't exist in the global table yet). */
7005 if (sig_entry != NULL && sig_entry->per_cu.tu_read)
7008 /* Note: cu->dwo_unit is the dwo_unit that references this TU, not the
7009 dwo_unit of the TU itself. */
7010 dwo_file = cu->dwo_unit->dwo_file;
7012 /* Ok, this is the first time we're reading this TU. */
7013 if (dwo_file->tus == NULL)
7015 find_dwo_entry.signature = sig;
7016 dwo_entry = (struct dwo_unit *) htab_find (dwo_file->tus, &find_dwo_entry);
7017 if (dwo_entry == NULL)
7020 /* If the global table doesn't have an entry for this TU, add one. */
7021 if (sig_entry == NULL)
7022 sig_entry = add_type_unit (dwarf2_per_objfile, sig, slot);
7024 fill_in_sig_entry_from_dwo_entry (dwarf2_per_objfile, sig_entry, dwo_entry);
7025 sig_entry->per_cu.tu_read = 1;
7029 /* Subroutine of lookup_signatured_type.
7030 Look up the type for signature SIG, and if we can't find SIG in .gdb_index
7031 then try the DWP file. If the TU stub (skeleton) has been removed then
7032 it won't be in .gdb_index. */
7034 static struct signatured_type *
7035 lookup_dwp_signatured_type (struct dwarf2_cu *cu, ULONGEST sig)
7037 struct dwarf2_per_objfile *dwarf2_per_objfile
7038 = cu->per_cu->dwarf2_per_objfile;
7039 struct objfile *objfile = dwarf2_per_objfile->objfile;
7040 struct dwp_file *dwp_file = get_dwp_file (dwarf2_per_objfile);
7041 struct dwo_unit *dwo_entry;
7042 struct signatured_type find_sig_entry, *sig_entry;
7045 gdb_assert (cu->dwo_unit && dwarf2_per_objfile->using_index);
7046 gdb_assert (dwp_file != NULL);
7048 /* If TU skeletons have been removed then we may not have read in any
7050 if (dwarf2_per_objfile->signatured_types == NULL)
7052 dwarf2_per_objfile->signatured_types
7053 = allocate_signatured_type_table (objfile);
7056 find_sig_entry.signature = sig;
7057 slot = htab_find_slot (dwarf2_per_objfile->signatured_types,
7058 &find_sig_entry, INSERT);
7059 sig_entry = (struct signatured_type *) *slot;
7061 /* Have we already tried to read this TU?
7062 Note: sig_entry can be NULL if the skeleton TU was removed (thus it
7063 needn't exist in the global table yet). */
7064 if (sig_entry != NULL)
7067 if (dwp_file->tus == NULL)
7069 dwo_entry = lookup_dwo_unit_in_dwp (dwarf2_per_objfile, dwp_file, NULL,
7070 sig, 1 /* is_debug_types */);
7071 if (dwo_entry == NULL)
7074 sig_entry = add_type_unit (dwarf2_per_objfile, sig, slot);
7075 fill_in_sig_entry_from_dwo_entry (dwarf2_per_objfile, sig_entry, dwo_entry);
7080 /* Lookup a signature based type for DW_FORM_ref_sig8.
7081 Returns NULL if signature SIG is not present in the table.
7082 It is up to the caller to complain about this. */
7084 static struct signatured_type *
7085 lookup_signatured_type (struct dwarf2_cu *cu, ULONGEST sig)
7087 struct dwarf2_per_objfile *dwarf2_per_objfile
7088 = cu->per_cu->dwarf2_per_objfile;
7091 && dwarf2_per_objfile->using_index)
7093 /* We're in a DWO/DWP file, and we're using .gdb_index.
7094 These cases require special processing. */
7095 if (get_dwp_file (dwarf2_per_objfile) == NULL)
7096 return lookup_dwo_signatured_type (cu, sig);
7098 return lookup_dwp_signatured_type (cu, sig);
7102 struct signatured_type find_entry, *entry;
7104 if (dwarf2_per_objfile->signatured_types == NULL)
7106 find_entry.signature = sig;
7107 entry = ((struct signatured_type *)
7108 htab_find (dwarf2_per_objfile->signatured_types, &find_entry));
7113 /* Low level DIE reading support. */
7115 /* Initialize a die_reader_specs struct from a dwarf2_cu struct. */
7118 init_cu_die_reader (struct die_reader_specs *reader,
7119 struct dwarf2_cu *cu,
7120 struct dwarf2_section_info *section,
7121 struct dwo_file *dwo_file,
7122 struct abbrev_table *abbrev_table)
7124 gdb_assert (section->readin && section->buffer != NULL);
7125 reader->abfd = get_section_bfd_owner (section);
7127 reader->dwo_file = dwo_file;
7128 reader->die_section = section;
7129 reader->buffer = section->buffer;
7130 reader->buffer_end = section->buffer + section->size;
7131 reader->comp_dir = NULL;
7132 reader->abbrev_table = abbrev_table;
7135 /* Subroutine of init_cutu_and_read_dies to simplify it.
7136 Read in the rest of a CU/TU top level DIE from DWO_UNIT.
7137 There's just a lot of work to do, and init_cutu_and_read_dies is big enough
7140 STUB_COMP_UNIT_DIE is for the stub DIE, we copy over certain attributes
7141 from it to the DIE in the DWO. If NULL we are skipping the stub.
7142 STUB_COMP_DIR is similar to STUB_COMP_UNIT_DIE: When reading a TU directly
7143 from the DWO file, bypassing the stub, it contains the DW_AT_comp_dir
7144 attribute of the referencing CU. At most one of STUB_COMP_UNIT_DIE and
7145 STUB_COMP_DIR may be non-NULL.
7146 *RESULT_READER,*RESULT_INFO_PTR,*RESULT_COMP_UNIT_DIE,*RESULT_HAS_CHILDREN
7147 are filled in with the info of the DIE from the DWO file.
7148 *RESULT_DWO_ABBREV_TABLE will be filled in with the abbrev table allocated
7149 from the dwo. Since *RESULT_READER references this abbrev table, it must be
7150 kept around for at least as long as *RESULT_READER.
7152 The result is non-zero if a valid (non-dummy) DIE was found. */
7155 read_cutu_die_from_dwo (struct dwarf2_per_cu_data *this_cu,
7156 struct dwo_unit *dwo_unit,
7157 struct die_info *stub_comp_unit_die,
7158 const char *stub_comp_dir,
7159 struct die_reader_specs *result_reader,
7160 const gdb_byte **result_info_ptr,
7161 struct die_info **result_comp_unit_die,
7162 int *result_has_children,
7163 abbrev_table_up *result_dwo_abbrev_table)
7165 struct dwarf2_per_objfile *dwarf2_per_objfile = this_cu->dwarf2_per_objfile;
7166 struct objfile *objfile = dwarf2_per_objfile->objfile;
7167 struct dwarf2_cu *cu = this_cu->cu;
7169 const gdb_byte *begin_info_ptr, *info_ptr;
7170 struct attribute *comp_dir, *stmt_list, *low_pc, *high_pc, *ranges;
7171 int i,num_extra_attrs;
7172 struct dwarf2_section_info *dwo_abbrev_section;
7173 struct attribute *attr;
7174 struct die_info *comp_unit_die;
7176 /* At most one of these may be provided. */
7177 gdb_assert ((stub_comp_unit_die != NULL) + (stub_comp_dir != NULL) <= 1);
7179 /* These attributes aren't processed until later:
7180 DW_AT_stmt_list, DW_AT_low_pc, DW_AT_high_pc, DW_AT_ranges.
7181 DW_AT_comp_dir is used now, to find the DWO file, but it is also
7182 referenced later. However, these attributes are found in the stub
7183 which we won't have later. In order to not impose this complication
7184 on the rest of the code, we read them here and copy them to the
7193 if (stub_comp_unit_die != NULL)
7195 /* For TUs in DWO files, the DW_AT_stmt_list attribute lives in the
7197 if (! this_cu->is_debug_types)
7198 stmt_list = dwarf2_attr (stub_comp_unit_die, DW_AT_stmt_list, cu);
7199 low_pc = dwarf2_attr (stub_comp_unit_die, DW_AT_low_pc, cu);
7200 high_pc = dwarf2_attr (stub_comp_unit_die, DW_AT_high_pc, cu);
7201 ranges = dwarf2_attr (stub_comp_unit_die, DW_AT_ranges, cu);
7202 comp_dir = dwarf2_attr (stub_comp_unit_die, DW_AT_comp_dir, cu);
7204 /* There should be a DW_AT_addr_base attribute here (if needed).
7205 We need the value before we can process DW_FORM_GNU_addr_index. */
7207 attr = dwarf2_attr (stub_comp_unit_die, DW_AT_GNU_addr_base, cu);
7209 cu->addr_base = DW_UNSND (attr);
7211 /* There should be a DW_AT_ranges_base attribute here (if needed).
7212 We need the value before we can process DW_AT_ranges. */
7213 cu->ranges_base = 0;
7214 attr = dwarf2_attr (stub_comp_unit_die, DW_AT_GNU_ranges_base, cu);
7216 cu->ranges_base = DW_UNSND (attr);
7218 else if (stub_comp_dir != NULL)
7220 /* Reconstruct the comp_dir attribute to simplify the code below. */
7221 comp_dir = XOBNEW (&cu->comp_unit_obstack, struct attribute);
7222 comp_dir->name = DW_AT_comp_dir;
7223 comp_dir->form = DW_FORM_string;
7224 DW_STRING_IS_CANONICAL (comp_dir) = 0;
7225 DW_STRING (comp_dir) = stub_comp_dir;
7228 /* Set up for reading the DWO CU/TU. */
7229 cu->dwo_unit = dwo_unit;
7230 dwarf2_section_info *section = dwo_unit->section;
7231 dwarf2_read_section (objfile, section);
7232 abfd = get_section_bfd_owner (section);
7233 begin_info_ptr = info_ptr = (section->buffer
7234 + to_underlying (dwo_unit->sect_off));
7235 dwo_abbrev_section = &dwo_unit->dwo_file->sections.abbrev;
7237 if (this_cu->is_debug_types)
7239 struct signatured_type *sig_type = (struct signatured_type *) this_cu;
7241 info_ptr = read_and_check_comp_unit_head (dwarf2_per_objfile,
7242 &cu->header, section,
7244 info_ptr, rcuh_kind::TYPE);
7245 /* This is not an assert because it can be caused by bad debug info. */
7246 if (sig_type->signature != cu->header.signature)
7248 error (_("Dwarf Error: signature mismatch %s vs %s while reading"
7249 " TU at offset %s [in module %s]"),
7250 hex_string (sig_type->signature),
7251 hex_string (cu->header.signature),
7252 sect_offset_str (dwo_unit->sect_off),
7253 bfd_get_filename (abfd));
7255 gdb_assert (dwo_unit->sect_off == cu->header.sect_off);
7256 /* For DWOs coming from DWP files, we don't know the CU length
7257 nor the type's offset in the TU until now. */
7258 dwo_unit->length = get_cu_length (&cu->header);
7259 dwo_unit->type_offset_in_tu = cu->header.type_cu_offset_in_tu;
7261 /* Establish the type offset that can be used to lookup the type.
7262 For DWO files, we don't know it until now. */
7263 sig_type->type_offset_in_section
7264 = dwo_unit->sect_off + to_underlying (dwo_unit->type_offset_in_tu);
7268 info_ptr = read_and_check_comp_unit_head (dwarf2_per_objfile,
7269 &cu->header, section,
7271 info_ptr, rcuh_kind::COMPILE);
7272 gdb_assert (dwo_unit->sect_off == cu->header.sect_off);
7273 /* For DWOs coming from DWP files, we don't know the CU length
7275 dwo_unit->length = get_cu_length (&cu->header);
7278 *result_dwo_abbrev_table
7279 = abbrev_table_read_table (dwarf2_per_objfile, dwo_abbrev_section,
7280 cu->header.abbrev_sect_off);
7281 init_cu_die_reader (result_reader, cu, section, dwo_unit->dwo_file,
7282 result_dwo_abbrev_table->get ());
7284 /* Read in the die, but leave space to copy over the attributes
7285 from the stub. This has the benefit of simplifying the rest of
7286 the code - all the work to maintain the illusion of a single
7287 DW_TAG_{compile,type}_unit DIE is done here. */
7288 num_extra_attrs = ((stmt_list != NULL)
7292 + (comp_dir != NULL));
7293 info_ptr = read_full_die_1 (result_reader, result_comp_unit_die, info_ptr,
7294 result_has_children, num_extra_attrs);
7296 /* Copy over the attributes from the stub to the DIE we just read in. */
7297 comp_unit_die = *result_comp_unit_die;
7298 i = comp_unit_die->num_attrs;
7299 if (stmt_list != NULL)
7300 comp_unit_die->attrs[i++] = *stmt_list;
7302 comp_unit_die->attrs[i++] = *low_pc;
7303 if (high_pc != NULL)
7304 comp_unit_die->attrs[i++] = *high_pc;
7306 comp_unit_die->attrs[i++] = *ranges;
7307 if (comp_dir != NULL)
7308 comp_unit_die->attrs[i++] = *comp_dir;
7309 comp_unit_die->num_attrs += num_extra_attrs;
7311 if (dwarf_die_debug)
7313 fprintf_unfiltered (gdb_stdlog,
7314 "Read die from %s@0x%x of %s:\n",
7315 get_section_name (section),
7316 (unsigned) (begin_info_ptr - section->buffer),
7317 bfd_get_filename (abfd));
7318 dump_die (comp_unit_die, dwarf_die_debug);
7321 /* Save the comp_dir attribute. If there is no DWP file then we'll read
7322 TUs by skipping the stub and going directly to the entry in the DWO file.
7323 However, skipping the stub means we won't get DW_AT_comp_dir, so we have
7324 to get it via circuitous means. Blech. */
7325 if (comp_dir != NULL)
7326 result_reader->comp_dir = DW_STRING (comp_dir);
7328 /* Skip dummy compilation units. */
7329 if (info_ptr >= begin_info_ptr + dwo_unit->length
7330 || peek_abbrev_code (abfd, info_ptr) == 0)
7333 *result_info_ptr = info_ptr;
7337 /* Subroutine of init_cutu_and_read_dies to simplify it.
7338 Look up the DWO unit specified by COMP_UNIT_DIE of THIS_CU.
7339 Returns NULL if the specified DWO unit cannot be found. */
7341 static struct dwo_unit *
7342 lookup_dwo_unit (struct dwarf2_per_cu_data *this_cu,
7343 struct die_info *comp_unit_die)
7345 struct dwarf2_cu *cu = this_cu->cu;
7347 struct dwo_unit *dwo_unit;
7348 const char *comp_dir, *dwo_name;
7350 gdb_assert (cu != NULL);
7352 /* Yeah, we look dwo_name up again, but it simplifies the code. */
7353 dwo_name = dwarf2_string_attr (comp_unit_die, DW_AT_GNU_dwo_name, cu);
7354 comp_dir = dwarf2_string_attr (comp_unit_die, DW_AT_comp_dir, cu);
7356 if (this_cu->is_debug_types)
7358 struct signatured_type *sig_type;
7360 /* Since this_cu is the first member of struct signatured_type,
7361 we can go from a pointer to one to a pointer to the other. */
7362 sig_type = (struct signatured_type *) this_cu;
7363 signature = sig_type->signature;
7364 dwo_unit = lookup_dwo_type_unit (sig_type, dwo_name, comp_dir);
7368 struct attribute *attr;
7370 attr = dwarf2_attr (comp_unit_die, DW_AT_GNU_dwo_id, cu);
7372 error (_("Dwarf Error: missing dwo_id for dwo_name %s"
7374 dwo_name, objfile_name (this_cu->dwarf2_per_objfile->objfile));
7375 signature = DW_UNSND (attr);
7376 dwo_unit = lookup_dwo_comp_unit (this_cu, dwo_name, comp_dir,
7383 /* Subroutine of init_cutu_and_read_dies to simplify it.
7384 See it for a description of the parameters.
7385 Read a TU directly from a DWO file, bypassing the stub. */
7388 init_tu_and_read_dwo_dies (struct dwarf2_per_cu_data *this_cu,
7389 int use_existing_cu, int keep,
7390 die_reader_func_ftype *die_reader_func,
7393 std::unique_ptr<dwarf2_cu> new_cu;
7394 struct signatured_type *sig_type;
7395 struct die_reader_specs reader;
7396 const gdb_byte *info_ptr;
7397 struct die_info *comp_unit_die;
7399 struct dwarf2_per_objfile *dwarf2_per_objfile = this_cu->dwarf2_per_objfile;
7401 /* Verify we can do the following downcast, and that we have the
7403 gdb_assert (this_cu->is_debug_types && this_cu->reading_dwo_directly);
7404 sig_type = (struct signatured_type *) this_cu;
7405 gdb_assert (sig_type->dwo_unit != NULL);
7407 if (use_existing_cu && this_cu->cu != NULL)
7409 gdb_assert (this_cu->cu->dwo_unit == sig_type->dwo_unit);
7410 /* There's no need to do the rereading_dwo_cu handling that
7411 init_cutu_and_read_dies does since we don't read the stub. */
7415 /* If !use_existing_cu, this_cu->cu must be NULL. */
7416 gdb_assert (this_cu->cu == NULL);
7417 new_cu.reset (new dwarf2_cu (this_cu));
7420 /* A future optimization, if needed, would be to use an existing
7421 abbrev table. When reading DWOs with skeletonless TUs, all the TUs
7422 could share abbrev tables. */
7424 /* The abbreviation table used by READER, this must live at least as long as
7426 abbrev_table_up dwo_abbrev_table;
7428 if (read_cutu_die_from_dwo (this_cu, sig_type->dwo_unit,
7429 NULL /* stub_comp_unit_die */,
7430 sig_type->dwo_unit->dwo_file->comp_dir,
7432 &comp_unit_die, &has_children,
7433 &dwo_abbrev_table) == 0)
7439 /* All the "real" work is done here. */
7440 die_reader_func (&reader, info_ptr, comp_unit_die, has_children, data);
7442 /* This duplicates the code in init_cutu_and_read_dies,
7443 but the alternative is making the latter more complex.
7444 This function is only for the special case of using DWO files directly:
7445 no point in overly complicating the general case just to handle this. */
7446 if (new_cu != NULL && keep)
7448 /* Link this CU into read_in_chain. */
7449 this_cu->cu->read_in_chain = dwarf2_per_objfile->read_in_chain;
7450 dwarf2_per_objfile->read_in_chain = this_cu;
7451 /* The chain owns it now. */
7456 /* Initialize a CU (or TU) and read its DIEs.
7457 If the CU defers to a DWO file, read the DWO file as well.
7459 ABBREV_TABLE, if non-NULL, is the abbreviation table to use.
7460 Otherwise the table specified in the comp unit header is read in and used.
7461 This is an optimization for when we already have the abbrev table.
7463 If USE_EXISTING_CU is non-zero, and THIS_CU->cu is non-NULL, then use it.
7464 Otherwise, a new CU is allocated with xmalloc.
7466 If KEEP is non-zero, then if we allocated a dwarf2_cu we add it to
7467 read_in_chain. Otherwise the dwarf2_cu data is freed at the end.
7469 WARNING: If THIS_CU is a "dummy CU" (used as filler by the incremental
7470 linker) then DIE_READER_FUNC will not get called. */
7473 init_cutu_and_read_dies (struct dwarf2_per_cu_data *this_cu,
7474 struct abbrev_table *abbrev_table,
7475 int use_existing_cu, int keep,
7476 die_reader_func_ftype *die_reader_func,
7479 struct dwarf2_per_objfile *dwarf2_per_objfile = this_cu->dwarf2_per_objfile;
7480 struct objfile *objfile = dwarf2_per_objfile->objfile;
7481 struct dwarf2_section_info *section = this_cu->section;
7482 bfd *abfd = get_section_bfd_owner (section);
7483 struct dwarf2_cu *cu;
7484 const gdb_byte *begin_info_ptr, *info_ptr;
7485 struct die_reader_specs reader;
7486 struct die_info *comp_unit_die;
7488 struct attribute *attr;
7489 struct signatured_type *sig_type = NULL;
7490 struct dwarf2_section_info *abbrev_section;
7491 /* Non-zero if CU currently points to a DWO file and we need to
7492 reread it. When this happens we need to reread the skeleton die
7493 before we can reread the DWO file (this only applies to CUs, not TUs). */
7494 int rereading_dwo_cu = 0;
7496 if (dwarf_die_debug)
7497 fprintf_unfiltered (gdb_stdlog, "Reading %s unit at offset %s\n",
7498 this_cu->is_debug_types ? "type" : "comp",
7499 sect_offset_str (this_cu->sect_off));
7501 if (use_existing_cu)
7504 /* If we're reading a TU directly from a DWO file, including a virtual DWO
7505 file (instead of going through the stub), short-circuit all of this. */
7506 if (this_cu->reading_dwo_directly)
7508 /* Narrow down the scope of possibilities to have to understand. */
7509 gdb_assert (this_cu->is_debug_types);
7510 gdb_assert (abbrev_table == NULL);
7511 init_tu_and_read_dwo_dies (this_cu, use_existing_cu, keep,
7512 die_reader_func, data);
7516 /* This is cheap if the section is already read in. */
7517 dwarf2_read_section (objfile, section);
7519 begin_info_ptr = info_ptr = section->buffer + to_underlying (this_cu->sect_off);
7521 abbrev_section = get_abbrev_section_for_cu (this_cu);
7523 std::unique_ptr<dwarf2_cu> new_cu;
7524 if (use_existing_cu && this_cu->cu != NULL)
7527 /* If this CU is from a DWO file we need to start over, we need to
7528 refetch the attributes from the skeleton CU.
7529 This could be optimized by retrieving those attributes from when we
7530 were here the first time: the previous comp_unit_die was stored in
7531 comp_unit_obstack. But there's no data yet that we need this
7533 if (cu->dwo_unit != NULL)
7534 rereading_dwo_cu = 1;
7538 /* If !use_existing_cu, this_cu->cu must be NULL. */
7539 gdb_assert (this_cu->cu == NULL);
7540 new_cu.reset (new dwarf2_cu (this_cu));
7544 /* Get the header. */
7545 if (to_underlying (cu->header.first_die_cu_offset) != 0 && !rereading_dwo_cu)
7547 /* We already have the header, there's no need to read it in again. */
7548 info_ptr += to_underlying (cu->header.first_die_cu_offset);
7552 if (this_cu->is_debug_types)
7554 info_ptr = read_and_check_comp_unit_head (dwarf2_per_objfile,
7555 &cu->header, section,
7556 abbrev_section, info_ptr,
7559 /* Since per_cu is the first member of struct signatured_type,
7560 we can go from a pointer to one to a pointer to the other. */
7561 sig_type = (struct signatured_type *) this_cu;
7562 gdb_assert (sig_type->signature == cu->header.signature);
7563 gdb_assert (sig_type->type_offset_in_tu
7564 == cu->header.type_cu_offset_in_tu);
7565 gdb_assert (this_cu->sect_off == cu->header.sect_off);
7567 /* LENGTH has not been set yet for type units if we're
7568 using .gdb_index. */
7569 this_cu->length = get_cu_length (&cu->header);
7571 /* Establish the type offset that can be used to lookup the type. */
7572 sig_type->type_offset_in_section =
7573 this_cu->sect_off + to_underlying (sig_type->type_offset_in_tu);
7575 this_cu->dwarf_version = cu->header.version;
7579 info_ptr = read_and_check_comp_unit_head (dwarf2_per_objfile,
7580 &cu->header, section,
7583 rcuh_kind::COMPILE);
7585 gdb_assert (this_cu->sect_off == cu->header.sect_off);
7586 gdb_assert (this_cu->length == get_cu_length (&cu->header));
7587 this_cu->dwarf_version = cu->header.version;
7591 /* Skip dummy compilation units. */
7592 if (info_ptr >= begin_info_ptr + this_cu->length
7593 || peek_abbrev_code (abfd, info_ptr) == 0)
7596 /* If we don't have them yet, read the abbrevs for this compilation unit.
7597 And if we need to read them now, make sure they're freed when we're
7598 done (own the table through ABBREV_TABLE_HOLDER). */
7599 abbrev_table_up abbrev_table_holder;
7600 if (abbrev_table != NULL)
7601 gdb_assert (cu->header.abbrev_sect_off == abbrev_table->sect_off);
7605 = abbrev_table_read_table (dwarf2_per_objfile, abbrev_section,
7606 cu->header.abbrev_sect_off);
7607 abbrev_table = abbrev_table_holder.get ();
7610 /* Read the top level CU/TU die. */
7611 init_cu_die_reader (&reader, cu, section, NULL, abbrev_table);
7612 info_ptr = read_full_die (&reader, &comp_unit_die, info_ptr, &has_children);
7614 /* If we are in a DWO stub, process it and then read in the "real" CU/TU
7615 from the DWO file. read_cutu_die_from_dwo will allocate the abbreviation
7616 table from the DWO file and pass the ownership over to us. It will be
7617 referenced from READER, so we must make sure to free it after we're done
7620 Note that if USE_EXISTING_OK != 0, and THIS_CU->cu already contains a
7621 DWO CU, that this test will fail (the attribute will not be present). */
7622 attr = dwarf2_attr (comp_unit_die, DW_AT_GNU_dwo_name, cu);
7623 abbrev_table_up dwo_abbrev_table;
7626 struct dwo_unit *dwo_unit;
7627 struct die_info *dwo_comp_unit_die;
7631 complaint (&symfile_complaints,
7632 _("compilation unit with DW_AT_GNU_dwo_name"
7633 " has children (offset %s) [in module %s]"),
7634 sect_offset_str (this_cu->sect_off),
7635 bfd_get_filename (abfd));
7637 dwo_unit = lookup_dwo_unit (this_cu, comp_unit_die);
7638 if (dwo_unit != NULL)
7640 if (read_cutu_die_from_dwo (this_cu, dwo_unit,
7641 comp_unit_die, NULL,
7643 &dwo_comp_unit_die, &has_children,
7644 &dwo_abbrev_table) == 0)
7649 comp_unit_die = dwo_comp_unit_die;
7653 /* Yikes, we couldn't find the rest of the DIE, we only have
7654 the stub. A complaint has already been logged. There's
7655 not much more we can do except pass on the stub DIE to
7656 die_reader_func. We don't want to throw an error on bad
7661 /* All of the above is setup for this call. Yikes. */
7662 die_reader_func (&reader, info_ptr, comp_unit_die, has_children, data);
7664 /* Done, clean up. */
7665 if (new_cu != NULL && keep)
7667 /* Link this CU into read_in_chain. */
7668 this_cu->cu->read_in_chain = dwarf2_per_objfile->read_in_chain;
7669 dwarf2_per_objfile->read_in_chain = this_cu;
7670 /* The chain owns it now. */
7675 /* Read CU/TU THIS_CU but do not follow DW_AT_GNU_dwo_name if present.
7676 DWO_FILE, if non-NULL, is the DWO file to read (the caller is assumed
7677 to have already done the lookup to find the DWO file).
7679 The caller is required to fill in THIS_CU->section, THIS_CU->offset, and
7680 THIS_CU->is_debug_types, but nothing else.
7682 We fill in THIS_CU->length.
7684 WARNING: If THIS_CU is a "dummy CU" (used as filler by the incremental
7685 linker) then DIE_READER_FUNC will not get called.
7687 THIS_CU->cu is always freed when done.
7688 This is done in order to not leave THIS_CU->cu in a state where we have
7689 to care whether it refers to the "main" CU or the DWO CU. */
7692 init_cutu_and_read_dies_no_follow (struct dwarf2_per_cu_data *this_cu,
7693 struct dwo_file *dwo_file,
7694 die_reader_func_ftype *die_reader_func,
7697 struct dwarf2_per_objfile *dwarf2_per_objfile = this_cu->dwarf2_per_objfile;
7698 struct objfile *objfile = dwarf2_per_objfile->objfile;
7699 struct dwarf2_section_info *section = this_cu->section;
7700 bfd *abfd = get_section_bfd_owner (section);
7701 struct dwarf2_section_info *abbrev_section;
7702 const gdb_byte *begin_info_ptr, *info_ptr;
7703 struct die_reader_specs reader;
7704 struct die_info *comp_unit_die;
7707 if (dwarf_die_debug)
7708 fprintf_unfiltered (gdb_stdlog, "Reading %s unit at offset %s\n",
7709 this_cu->is_debug_types ? "type" : "comp",
7710 sect_offset_str (this_cu->sect_off));
7712 gdb_assert (this_cu->cu == NULL);
7714 abbrev_section = (dwo_file != NULL
7715 ? &dwo_file->sections.abbrev
7716 : get_abbrev_section_for_cu (this_cu));
7718 /* This is cheap if the section is already read in. */
7719 dwarf2_read_section (objfile, section);
7721 struct dwarf2_cu cu (this_cu);
7723 begin_info_ptr = info_ptr = section->buffer + to_underlying (this_cu->sect_off);
7724 info_ptr = read_and_check_comp_unit_head (dwarf2_per_objfile,
7725 &cu.header, section,
7726 abbrev_section, info_ptr,
7727 (this_cu->is_debug_types
7729 : rcuh_kind::COMPILE));
7731 this_cu->length = get_cu_length (&cu.header);
7733 /* Skip dummy compilation units. */
7734 if (info_ptr >= begin_info_ptr + this_cu->length
7735 || peek_abbrev_code (abfd, info_ptr) == 0)
7738 abbrev_table_up abbrev_table
7739 = abbrev_table_read_table (dwarf2_per_objfile, abbrev_section,
7740 cu.header.abbrev_sect_off);
7742 init_cu_die_reader (&reader, &cu, section, dwo_file, abbrev_table.get ());
7743 info_ptr = read_full_die (&reader, &comp_unit_die, info_ptr, &has_children);
7745 die_reader_func (&reader, info_ptr, comp_unit_die, has_children, data);
7748 /* Read a CU/TU, except that this does not look for DW_AT_GNU_dwo_name and
7749 does not lookup the specified DWO file.
7750 This cannot be used to read DWO files.
7752 THIS_CU->cu is always freed when done.
7753 This is done in order to not leave THIS_CU->cu in a state where we have
7754 to care whether it refers to the "main" CU or the DWO CU.
7755 We can revisit this if the data shows there's a performance issue. */
7758 init_cutu_and_read_dies_simple (struct dwarf2_per_cu_data *this_cu,
7759 die_reader_func_ftype *die_reader_func,
7762 init_cutu_and_read_dies_no_follow (this_cu, NULL, die_reader_func, data);
7765 /* Type Unit Groups.
7767 Type Unit Groups are a way to collapse the set of all TUs (type units) into
7768 a more manageable set. The grouping is done by DW_AT_stmt_list entry
7769 so that all types coming from the same compilation (.o file) are grouped
7770 together. A future step could be to put the types in the same symtab as
7771 the CU the types ultimately came from. */
7774 hash_type_unit_group (const void *item)
7776 const struct type_unit_group *tu_group
7777 = (const struct type_unit_group *) item;
7779 return hash_stmt_list_entry (&tu_group->hash);
7783 eq_type_unit_group (const void *item_lhs, const void *item_rhs)
7785 const struct type_unit_group *lhs = (const struct type_unit_group *) item_lhs;
7786 const struct type_unit_group *rhs = (const struct type_unit_group *) item_rhs;
7788 return eq_stmt_list_entry (&lhs->hash, &rhs->hash);
7791 /* Allocate a hash table for type unit groups. */
7794 allocate_type_unit_groups_table (struct objfile *objfile)
7796 return htab_create_alloc_ex (3,
7797 hash_type_unit_group,
7800 &objfile->objfile_obstack,
7801 hashtab_obstack_allocate,
7802 dummy_obstack_deallocate);
7805 /* Type units that don't have DW_AT_stmt_list are grouped into their own
7806 partial symtabs. We combine several TUs per psymtab to not let the size
7807 of any one psymtab grow too big. */
7808 #define NO_STMT_LIST_TYPE_UNIT_PSYMTAB (1 << 31)
7809 #define NO_STMT_LIST_TYPE_UNIT_PSYMTAB_SIZE 10
7811 /* Helper routine for get_type_unit_group.
7812 Create the type_unit_group object used to hold one or more TUs. */
7814 static struct type_unit_group *
7815 create_type_unit_group (struct dwarf2_cu *cu, sect_offset line_offset_struct)
7817 struct dwarf2_per_objfile *dwarf2_per_objfile
7818 = cu->per_cu->dwarf2_per_objfile;
7819 struct objfile *objfile = dwarf2_per_objfile->objfile;
7820 struct dwarf2_per_cu_data *per_cu;
7821 struct type_unit_group *tu_group;
7823 tu_group = OBSTACK_ZALLOC (&objfile->objfile_obstack,
7824 struct type_unit_group);
7825 per_cu = &tu_group->per_cu;
7826 per_cu->dwarf2_per_objfile = dwarf2_per_objfile;
7828 if (dwarf2_per_objfile->using_index)
7830 per_cu->v.quick = OBSTACK_ZALLOC (&objfile->objfile_obstack,
7831 struct dwarf2_per_cu_quick_data);
7835 unsigned int line_offset = to_underlying (line_offset_struct);
7836 struct partial_symtab *pst;
7839 /* Give the symtab a useful name for debug purposes. */
7840 if ((line_offset & NO_STMT_LIST_TYPE_UNIT_PSYMTAB) != 0)
7841 name = xstrprintf ("<type_units_%d>",
7842 (line_offset & ~NO_STMT_LIST_TYPE_UNIT_PSYMTAB));
7844 name = xstrprintf ("<type_units_at_0x%x>", line_offset);
7846 pst = create_partial_symtab (per_cu, name);
7852 tu_group->hash.dwo_unit = cu->dwo_unit;
7853 tu_group->hash.line_sect_off = line_offset_struct;
7858 /* Look up the type_unit_group for type unit CU, and create it if necessary.
7859 STMT_LIST is a DW_AT_stmt_list attribute. */
7861 static struct type_unit_group *
7862 get_type_unit_group (struct dwarf2_cu *cu, const struct attribute *stmt_list)
7864 struct dwarf2_per_objfile *dwarf2_per_objfile
7865 = cu->per_cu->dwarf2_per_objfile;
7866 struct tu_stats *tu_stats = &dwarf2_per_objfile->tu_stats;
7867 struct type_unit_group *tu_group;
7869 unsigned int line_offset;
7870 struct type_unit_group type_unit_group_for_lookup;
7872 if (dwarf2_per_objfile->type_unit_groups == NULL)
7874 dwarf2_per_objfile->type_unit_groups =
7875 allocate_type_unit_groups_table (dwarf2_per_objfile->objfile);
7878 /* Do we need to create a new group, or can we use an existing one? */
7882 line_offset = DW_UNSND (stmt_list);
7883 ++tu_stats->nr_symtab_sharers;
7887 /* Ugh, no stmt_list. Rare, but we have to handle it.
7888 We can do various things here like create one group per TU or
7889 spread them over multiple groups to split up the expansion work.
7890 To avoid worst case scenarios (too many groups or too large groups)
7891 we, umm, group them in bunches. */
7892 line_offset = (NO_STMT_LIST_TYPE_UNIT_PSYMTAB
7893 | (tu_stats->nr_stmt_less_type_units
7894 / NO_STMT_LIST_TYPE_UNIT_PSYMTAB_SIZE));
7895 ++tu_stats->nr_stmt_less_type_units;
7898 type_unit_group_for_lookup.hash.dwo_unit = cu->dwo_unit;
7899 type_unit_group_for_lookup.hash.line_sect_off = (sect_offset) line_offset;
7900 slot = htab_find_slot (dwarf2_per_objfile->type_unit_groups,
7901 &type_unit_group_for_lookup, INSERT);
7904 tu_group = (struct type_unit_group *) *slot;
7905 gdb_assert (tu_group != NULL);
7909 sect_offset line_offset_struct = (sect_offset) line_offset;
7910 tu_group = create_type_unit_group (cu, line_offset_struct);
7912 ++tu_stats->nr_symtabs;
7918 /* Partial symbol tables. */
7920 /* Create a psymtab named NAME and assign it to PER_CU.
7922 The caller must fill in the following details:
7923 dirname, textlow, texthigh. */
7925 static struct partial_symtab *
7926 create_partial_symtab (struct dwarf2_per_cu_data *per_cu, const char *name)
7928 struct objfile *objfile = per_cu->dwarf2_per_objfile->objfile;
7929 struct partial_symtab *pst;
7931 pst = start_psymtab_common (objfile, name, 0,
7932 objfile->global_psymbols,
7933 objfile->static_psymbols);
7935 pst->psymtabs_addrmap_supported = 1;
7937 /* This is the glue that links PST into GDB's symbol API. */
7938 pst->read_symtab_private = per_cu;
7939 pst->read_symtab = dwarf2_read_symtab;
7940 per_cu->v.psymtab = pst;
7945 /* The DATA object passed to process_psymtab_comp_unit_reader has this
7948 struct process_psymtab_comp_unit_data
7950 /* True if we are reading a DW_TAG_partial_unit. */
7952 int want_partial_unit;
7954 /* The "pretend" language that is used if the CU doesn't declare a
7957 enum language pretend_language;
7960 /* die_reader_func for process_psymtab_comp_unit. */
7963 process_psymtab_comp_unit_reader (const struct die_reader_specs *reader,
7964 const gdb_byte *info_ptr,
7965 struct die_info *comp_unit_die,
7969 struct dwarf2_cu *cu = reader->cu;
7970 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
7971 struct gdbarch *gdbarch = get_objfile_arch (objfile);
7972 struct dwarf2_per_cu_data *per_cu = cu->per_cu;
7974 CORE_ADDR best_lowpc = 0, best_highpc = 0;
7975 struct partial_symtab *pst;
7976 enum pc_bounds_kind cu_bounds_kind;
7977 const char *filename;
7978 struct process_psymtab_comp_unit_data *info
7979 = (struct process_psymtab_comp_unit_data *) data;
7981 if (comp_unit_die->tag == DW_TAG_partial_unit && !info->want_partial_unit)
7984 gdb_assert (! per_cu->is_debug_types);
7986 prepare_one_comp_unit (cu, comp_unit_die, info->pretend_language);
7988 cu->list_in_scope = &file_symbols;
7990 /* Allocate a new partial symbol table structure. */
7991 filename = dwarf2_string_attr (comp_unit_die, DW_AT_name, cu);
7992 if (filename == NULL)
7995 pst = create_partial_symtab (per_cu, filename);
7997 /* This must be done before calling dwarf2_build_include_psymtabs. */
7998 pst->dirname = dwarf2_string_attr (comp_unit_die, DW_AT_comp_dir, cu);
8000 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
8002 dwarf2_find_base_address (comp_unit_die, cu);
8004 /* Possibly set the default values of LOWPC and HIGHPC from
8006 cu_bounds_kind = dwarf2_get_pc_bounds (comp_unit_die, &best_lowpc,
8007 &best_highpc, cu, pst);
8008 if (cu_bounds_kind == PC_BOUNDS_HIGH_LOW && best_lowpc < best_highpc)
8009 /* Store the contiguous range if it is not empty; it can be empty for
8010 CUs with no code. */
8011 addrmap_set_empty (objfile->psymtabs_addrmap,
8012 gdbarch_adjust_dwarf2_addr (gdbarch,
8013 best_lowpc + baseaddr),
8014 gdbarch_adjust_dwarf2_addr (gdbarch,
8015 best_highpc + baseaddr) - 1,
8018 /* Check if comp unit has_children.
8019 If so, read the rest of the partial symbols from this comp unit.
8020 If not, there's no more debug_info for this comp unit. */
8023 struct partial_die_info *first_die;
8024 CORE_ADDR lowpc, highpc;
8026 lowpc = ((CORE_ADDR) -1);
8027 highpc = ((CORE_ADDR) 0);
8029 first_die = load_partial_dies (reader, info_ptr, 1);
8031 scan_partial_symbols (first_die, &lowpc, &highpc,
8032 cu_bounds_kind <= PC_BOUNDS_INVALID, cu);
8034 /* If we didn't find a lowpc, set it to highpc to avoid
8035 complaints from `maint check'. */
8036 if (lowpc == ((CORE_ADDR) -1))
8039 /* If the compilation unit didn't have an explicit address range,
8040 then use the information extracted from its child dies. */
8041 if (cu_bounds_kind <= PC_BOUNDS_INVALID)
8044 best_highpc = highpc;
8047 pst->textlow = gdbarch_adjust_dwarf2_addr (gdbarch, best_lowpc + baseaddr);
8048 pst->texthigh = gdbarch_adjust_dwarf2_addr (gdbarch, best_highpc + baseaddr);
8050 end_psymtab_common (objfile, pst);
8052 if (!VEC_empty (dwarf2_per_cu_ptr, cu->per_cu->imported_symtabs))
8055 int len = VEC_length (dwarf2_per_cu_ptr, cu->per_cu->imported_symtabs);
8056 struct dwarf2_per_cu_data *iter;
8058 /* Fill in 'dependencies' here; we fill in 'users' in a
8060 pst->number_of_dependencies = len;
8062 XOBNEWVEC (&objfile->objfile_obstack, struct partial_symtab *, len);
8064 VEC_iterate (dwarf2_per_cu_ptr, cu->per_cu->imported_symtabs,
8067 pst->dependencies[i] = iter->v.psymtab;
8069 VEC_free (dwarf2_per_cu_ptr, cu->per_cu->imported_symtabs);
8072 /* Get the list of files included in the current compilation unit,
8073 and build a psymtab for each of them. */
8074 dwarf2_build_include_psymtabs (cu, comp_unit_die, pst);
8076 if (dwarf_read_debug)
8078 struct gdbarch *gdbarch = get_objfile_arch (objfile);
8080 fprintf_unfiltered (gdb_stdlog,
8081 "Psymtab for %s unit @%s: %s - %s"
8082 ", %d global, %d static syms\n",
8083 per_cu->is_debug_types ? "type" : "comp",
8084 sect_offset_str (per_cu->sect_off),
8085 paddress (gdbarch, pst->textlow),
8086 paddress (gdbarch, pst->texthigh),
8087 pst->n_global_syms, pst->n_static_syms);
8091 /* Subroutine of dwarf2_build_psymtabs_hard to simplify it.
8092 Process compilation unit THIS_CU for a psymtab. */
8095 process_psymtab_comp_unit (struct dwarf2_per_cu_data *this_cu,
8096 int want_partial_unit,
8097 enum language pretend_language)
8099 /* If this compilation unit was already read in, free the
8100 cached copy in order to read it in again. This is
8101 necessary because we skipped some symbols when we first
8102 read in the compilation unit (see load_partial_dies).
8103 This problem could be avoided, but the benefit is unclear. */
8104 if (this_cu->cu != NULL)
8105 free_one_cached_comp_unit (this_cu);
8107 if (this_cu->is_debug_types)
8108 init_cutu_and_read_dies (this_cu, NULL, 0, 0, build_type_psymtabs_reader,
8112 process_psymtab_comp_unit_data info;
8113 info.want_partial_unit = want_partial_unit;
8114 info.pretend_language = pretend_language;
8115 init_cutu_and_read_dies (this_cu, NULL, 0, 0,
8116 process_psymtab_comp_unit_reader, &info);
8119 /* Age out any secondary CUs. */
8120 age_cached_comp_units (this_cu->dwarf2_per_objfile);
8123 /* Reader function for build_type_psymtabs. */
8126 build_type_psymtabs_reader (const struct die_reader_specs *reader,
8127 const gdb_byte *info_ptr,
8128 struct die_info *type_unit_die,
8132 struct dwarf2_per_objfile *dwarf2_per_objfile
8133 = reader->cu->per_cu->dwarf2_per_objfile;
8134 struct objfile *objfile = dwarf2_per_objfile->objfile;
8135 struct dwarf2_cu *cu = reader->cu;
8136 struct dwarf2_per_cu_data *per_cu = cu->per_cu;
8137 struct signatured_type *sig_type;
8138 struct type_unit_group *tu_group;
8139 struct attribute *attr;
8140 struct partial_die_info *first_die;
8141 CORE_ADDR lowpc, highpc;
8142 struct partial_symtab *pst;
8144 gdb_assert (data == NULL);
8145 gdb_assert (per_cu->is_debug_types);
8146 sig_type = (struct signatured_type *) per_cu;
8151 attr = dwarf2_attr_no_follow (type_unit_die, DW_AT_stmt_list);
8152 tu_group = get_type_unit_group (cu, attr);
8154 VEC_safe_push (sig_type_ptr, tu_group->tus, sig_type);
8156 prepare_one_comp_unit (cu, type_unit_die, language_minimal);
8157 cu->list_in_scope = &file_symbols;
8158 pst = create_partial_symtab (per_cu, "");
8161 first_die = load_partial_dies (reader, info_ptr, 1);
8163 lowpc = (CORE_ADDR) -1;
8164 highpc = (CORE_ADDR) 0;
8165 scan_partial_symbols (first_die, &lowpc, &highpc, 0, cu);
8167 end_psymtab_common (objfile, pst);
8170 /* Struct used to sort TUs by their abbreviation table offset. */
8172 struct tu_abbrev_offset
8174 struct signatured_type *sig_type;
8175 sect_offset abbrev_offset;
8178 /* Helper routine for build_type_psymtabs_1, passed to std::sort. */
8181 sort_tu_by_abbrev_offset (const struct tu_abbrev_offset &a,
8182 const struct tu_abbrev_offset &b)
8184 return a.abbrev_offset < b.abbrev_offset;
8187 /* Efficiently read all the type units.
8188 This does the bulk of the work for build_type_psymtabs.
8190 The efficiency is because we sort TUs by the abbrev table they use and
8191 only read each abbrev table once. In one program there are 200K TUs
8192 sharing 8K abbrev tables.
8194 The main purpose of this function is to support building the
8195 dwarf2_per_objfile->type_unit_groups table.
8196 TUs typically share the DW_AT_stmt_list of the CU they came from, so we
8197 can collapse the search space by grouping them by stmt_list.
8198 The savings can be significant, in the same program from above the 200K TUs
8199 share 8K stmt_list tables.
8201 FUNC is expected to call get_type_unit_group, which will create the
8202 struct type_unit_group if necessary and add it to
8203 dwarf2_per_objfile->type_unit_groups. */
8206 build_type_psymtabs_1 (struct dwarf2_per_objfile *dwarf2_per_objfile)
8208 struct tu_stats *tu_stats = &dwarf2_per_objfile->tu_stats;
8209 abbrev_table_up abbrev_table;
8210 sect_offset abbrev_offset;
8213 /* It's up to the caller to not call us multiple times. */
8214 gdb_assert (dwarf2_per_objfile->type_unit_groups == NULL);
8216 if (dwarf2_per_objfile->n_type_units == 0)
8219 /* TUs typically share abbrev tables, and there can be way more TUs than
8220 abbrev tables. Sort by abbrev table to reduce the number of times we
8221 read each abbrev table in.
8222 Alternatives are to punt or to maintain a cache of abbrev tables.
8223 This is simpler and efficient enough for now.
8225 Later we group TUs by their DW_AT_stmt_list value (as this defines the
8226 symtab to use). Typically TUs with the same abbrev offset have the same
8227 stmt_list value too so in practice this should work well.
8229 The basic algorithm here is:
8231 sort TUs by abbrev table
8232 for each TU with same abbrev table:
8233 read abbrev table if first user
8234 read TU top level DIE
8235 [IWBN if DWO skeletons had DW_AT_stmt_list]
8238 if (dwarf_read_debug)
8239 fprintf_unfiltered (gdb_stdlog, "Building type unit groups ...\n");
8241 /* Sort in a separate table to maintain the order of all_type_units
8242 for .gdb_index: TU indices directly index all_type_units. */
8243 std::vector<struct tu_abbrev_offset> sorted_by_abbrev
8244 (dwarf2_per_objfile->n_type_units);
8245 for (i = 0; i < dwarf2_per_objfile->n_type_units; ++i)
8247 struct signatured_type *sig_type = dwarf2_per_objfile->all_type_units[i];
8249 sorted_by_abbrev[i].sig_type = sig_type;
8250 sorted_by_abbrev[i].abbrev_offset =
8251 read_abbrev_offset (dwarf2_per_objfile,
8252 sig_type->per_cu.section,
8253 sig_type->per_cu.sect_off);
8255 std::sort (sorted_by_abbrev.begin (), sorted_by_abbrev.end (),
8256 sort_tu_by_abbrev_offset);
8258 abbrev_offset = (sect_offset) ~(unsigned) 0;
8260 for (i = 0; i < dwarf2_per_objfile->n_type_units; ++i)
8262 const struct tu_abbrev_offset *tu = &sorted_by_abbrev[i];
8264 /* Switch to the next abbrev table if necessary. */
8265 if (abbrev_table == NULL
8266 || tu->abbrev_offset != abbrev_offset)
8268 abbrev_offset = tu->abbrev_offset;
8270 abbrev_table_read_table (dwarf2_per_objfile,
8271 &dwarf2_per_objfile->abbrev,
8273 ++tu_stats->nr_uniq_abbrev_tables;
8276 init_cutu_and_read_dies (&tu->sig_type->per_cu, abbrev_table.get (),
8277 0, 0, build_type_psymtabs_reader, NULL);
8281 /* Print collected type unit statistics. */
8284 print_tu_stats (struct dwarf2_per_objfile *dwarf2_per_objfile)
8286 struct tu_stats *tu_stats = &dwarf2_per_objfile->tu_stats;
8288 fprintf_unfiltered (gdb_stdlog, "Type unit statistics:\n");
8289 fprintf_unfiltered (gdb_stdlog, " %d TUs\n",
8290 dwarf2_per_objfile->n_type_units);
8291 fprintf_unfiltered (gdb_stdlog, " %d uniq abbrev tables\n",
8292 tu_stats->nr_uniq_abbrev_tables);
8293 fprintf_unfiltered (gdb_stdlog, " %d symtabs from stmt_list entries\n",
8294 tu_stats->nr_symtabs);
8295 fprintf_unfiltered (gdb_stdlog, " %d symtab sharers\n",
8296 tu_stats->nr_symtab_sharers);
8297 fprintf_unfiltered (gdb_stdlog, " %d type units without a stmt_list\n",
8298 tu_stats->nr_stmt_less_type_units);
8299 fprintf_unfiltered (gdb_stdlog, " %d all_type_units reallocs\n",
8300 tu_stats->nr_all_type_units_reallocs);
8303 /* Traversal function for build_type_psymtabs. */
8306 build_type_psymtab_dependencies (void **slot, void *info)
8308 struct dwarf2_per_objfile *dwarf2_per_objfile
8309 = (struct dwarf2_per_objfile *) info;
8310 struct objfile *objfile = dwarf2_per_objfile->objfile;
8311 struct type_unit_group *tu_group = (struct type_unit_group *) *slot;
8312 struct dwarf2_per_cu_data *per_cu = &tu_group->per_cu;
8313 struct partial_symtab *pst = per_cu->v.psymtab;
8314 int len = VEC_length (sig_type_ptr, tu_group->tus);
8315 struct signatured_type *iter;
8318 gdb_assert (len > 0);
8319 gdb_assert (IS_TYPE_UNIT_GROUP (per_cu));
8321 pst->number_of_dependencies = len;
8323 XOBNEWVEC (&objfile->objfile_obstack, struct partial_symtab *, len);
8325 VEC_iterate (sig_type_ptr, tu_group->tus, i, iter);
8328 gdb_assert (iter->per_cu.is_debug_types);
8329 pst->dependencies[i] = iter->per_cu.v.psymtab;
8330 iter->type_unit_group = tu_group;
8333 VEC_free (sig_type_ptr, tu_group->tus);
8338 /* Subroutine of dwarf2_build_psymtabs_hard to simplify it.
8339 Build partial symbol tables for the .debug_types comp-units. */
8342 build_type_psymtabs (struct dwarf2_per_objfile *dwarf2_per_objfile)
8344 if (! create_all_type_units (dwarf2_per_objfile))
8347 build_type_psymtabs_1 (dwarf2_per_objfile);
8350 /* Traversal function for process_skeletonless_type_unit.
8351 Read a TU in a DWO file and build partial symbols for it. */
8354 process_skeletonless_type_unit (void **slot, void *info)
8356 struct dwo_unit *dwo_unit = (struct dwo_unit *) *slot;
8357 struct dwarf2_per_objfile *dwarf2_per_objfile
8358 = (struct dwarf2_per_objfile *) info;
8359 struct signatured_type find_entry, *entry;
8361 /* If this TU doesn't exist in the global table, add it and read it in. */
8363 if (dwarf2_per_objfile->signatured_types == NULL)
8365 dwarf2_per_objfile->signatured_types
8366 = allocate_signatured_type_table (dwarf2_per_objfile->objfile);
8369 find_entry.signature = dwo_unit->signature;
8370 slot = htab_find_slot (dwarf2_per_objfile->signatured_types, &find_entry,
8372 /* If we've already seen this type there's nothing to do. What's happening
8373 is we're doing our own version of comdat-folding here. */
8377 /* This does the job that create_all_type_units would have done for
8379 entry = add_type_unit (dwarf2_per_objfile, dwo_unit->signature, slot);
8380 fill_in_sig_entry_from_dwo_entry (dwarf2_per_objfile, entry, dwo_unit);
8383 /* This does the job that build_type_psymtabs_1 would have done. */
8384 init_cutu_and_read_dies (&entry->per_cu, NULL, 0, 0,
8385 build_type_psymtabs_reader, NULL);
8390 /* Traversal function for process_skeletonless_type_units. */
8393 process_dwo_file_for_skeletonless_type_units (void **slot, void *info)
8395 struct dwo_file *dwo_file = (struct dwo_file *) *slot;
8397 if (dwo_file->tus != NULL)
8399 htab_traverse_noresize (dwo_file->tus,
8400 process_skeletonless_type_unit, info);
8406 /* Scan all TUs of DWO files, verifying we've processed them.
8407 This is needed in case a TU was emitted without its skeleton.
8408 Note: This can't be done until we know what all the DWO files are. */
8411 process_skeletonless_type_units (struct dwarf2_per_objfile *dwarf2_per_objfile)
8413 /* Skeletonless TUs in DWP files without .gdb_index is not supported yet. */
8414 if (get_dwp_file (dwarf2_per_objfile) == NULL
8415 && dwarf2_per_objfile->dwo_files != NULL)
8417 htab_traverse_noresize (dwarf2_per_objfile->dwo_files,
8418 process_dwo_file_for_skeletonless_type_units,
8419 dwarf2_per_objfile);
8423 /* Compute the 'user' field for each psymtab in DWARF2_PER_OBJFILE. */
8426 set_partial_user (struct dwarf2_per_objfile *dwarf2_per_objfile)
8430 for (i = 0; i < dwarf2_per_objfile->n_comp_units; ++i)
8432 dwarf2_per_cu_data *per_cu = dwarf2_per_objfile->get_cu (i);
8433 struct partial_symtab *pst = per_cu->v.psymtab;
8439 for (j = 0; j < pst->number_of_dependencies; ++j)
8441 /* Set the 'user' field only if it is not already set. */
8442 if (pst->dependencies[j]->user == NULL)
8443 pst->dependencies[j]->user = pst;
8448 /* Build the partial symbol table by doing a quick pass through the
8449 .debug_info and .debug_abbrev sections. */
8452 dwarf2_build_psymtabs_hard (struct dwarf2_per_objfile *dwarf2_per_objfile)
8455 struct objfile *objfile = dwarf2_per_objfile->objfile;
8457 if (dwarf_read_debug)
8459 fprintf_unfiltered (gdb_stdlog, "Building psymtabs of objfile %s ...\n",
8460 objfile_name (objfile));
8463 dwarf2_per_objfile->reading_partial_symbols = 1;
8465 dwarf2_read_section (objfile, &dwarf2_per_objfile->info);
8467 /* Any cached compilation units will be linked by the per-objfile
8468 read_in_chain. Make sure to free them when we're done. */
8469 free_cached_comp_units freer (dwarf2_per_objfile);
8471 build_type_psymtabs (dwarf2_per_objfile);
8473 create_all_comp_units (dwarf2_per_objfile);
8475 /* Create a temporary address map on a temporary obstack. We later
8476 copy this to the final obstack. */
8477 auto_obstack temp_obstack;
8479 scoped_restore save_psymtabs_addrmap
8480 = make_scoped_restore (&objfile->psymtabs_addrmap,
8481 addrmap_create_mutable (&temp_obstack));
8483 for (i = 0; i < dwarf2_per_objfile->n_comp_units; ++i)
8485 dwarf2_per_cu_data *per_cu = dwarf2_per_objfile->get_cu (i);
8487 process_psymtab_comp_unit (per_cu, 0, language_minimal);
8490 /* This has to wait until we read the CUs, we need the list of DWOs. */
8491 process_skeletonless_type_units (dwarf2_per_objfile);
8493 /* Now that all TUs have been processed we can fill in the dependencies. */
8494 if (dwarf2_per_objfile->type_unit_groups != NULL)
8496 htab_traverse_noresize (dwarf2_per_objfile->type_unit_groups,
8497 build_type_psymtab_dependencies, dwarf2_per_objfile);
8500 if (dwarf_read_debug)
8501 print_tu_stats (dwarf2_per_objfile);
8503 set_partial_user (dwarf2_per_objfile);
8505 objfile->psymtabs_addrmap = addrmap_create_fixed (objfile->psymtabs_addrmap,
8506 &objfile->objfile_obstack);
8507 /* At this point we want to keep the address map. */
8508 save_psymtabs_addrmap.release ();
8510 if (dwarf_read_debug)
8511 fprintf_unfiltered (gdb_stdlog, "Done building psymtabs of %s\n",
8512 objfile_name (objfile));
8515 /* die_reader_func for load_partial_comp_unit. */
8518 load_partial_comp_unit_reader (const struct die_reader_specs *reader,
8519 const gdb_byte *info_ptr,
8520 struct die_info *comp_unit_die,
8524 struct dwarf2_cu *cu = reader->cu;
8526 prepare_one_comp_unit (cu, comp_unit_die, language_minimal);
8528 /* Check if comp unit has_children.
8529 If so, read the rest of the partial symbols from this comp unit.
8530 If not, there's no more debug_info for this comp unit. */
8532 load_partial_dies (reader, info_ptr, 0);
8535 /* Load the partial DIEs for a secondary CU into memory.
8536 This is also used when rereading a primary CU with load_all_dies. */
8539 load_partial_comp_unit (struct dwarf2_per_cu_data *this_cu)
8541 init_cutu_and_read_dies (this_cu, NULL, 1, 1,
8542 load_partial_comp_unit_reader, NULL);
8546 read_comp_units_from_section (struct dwarf2_per_objfile *dwarf2_per_objfile,
8547 struct dwarf2_section_info *section,
8548 struct dwarf2_section_info *abbrev_section,
8549 unsigned int is_dwz,
8552 struct dwarf2_per_cu_data ***all_comp_units)
8554 const gdb_byte *info_ptr;
8555 struct objfile *objfile = dwarf2_per_objfile->objfile;
8557 if (dwarf_read_debug)
8558 fprintf_unfiltered (gdb_stdlog, "Reading %s for %s\n",
8559 get_section_name (section),
8560 get_section_file_name (section));
8562 dwarf2_read_section (objfile, section);
8564 info_ptr = section->buffer;
8566 while (info_ptr < section->buffer + section->size)
8568 struct dwarf2_per_cu_data *this_cu;
8570 sect_offset sect_off = (sect_offset) (info_ptr - section->buffer);
8572 comp_unit_head cu_header;
8573 read_and_check_comp_unit_head (dwarf2_per_objfile, &cu_header, section,
8574 abbrev_section, info_ptr,
8575 rcuh_kind::COMPILE);
8577 /* Save the compilation unit for later lookup. */
8578 if (cu_header.unit_type != DW_UT_type)
8580 this_cu = XOBNEW (&objfile->objfile_obstack,
8581 struct dwarf2_per_cu_data);
8582 memset (this_cu, 0, sizeof (*this_cu));
8586 auto sig_type = XOBNEW (&objfile->objfile_obstack,
8587 struct signatured_type);
8588 memset (sig_type, 0, sizeof (*sig_type));
8589 sig_type->signature = cu_header.signature;
8590 sig_type->type_offset_in_tu = cu_header.type_cu_offset_in_tu;
8591 this_cu = &sig_type->per_cu;
8593 this_cu->is_debug_types = (cu_header.unit_type == DW_UT_type);
8594 this_cu->sect_off = sect_off;
8595 this_cu->length = cu_header.length + cu_header.initial_length_size;
8596 this_cu->is_dwz = is_dwz;
8597 this_cu->dwarf2_per_objfile = dwarf2_per_objfile;
8598 this_cu->section = section;
8600 if (*n_comp_units == *n_allocated)
8603 *all_comp_units = XRESIZEVEC (struct dwarf2_per_cu_data *,
8604 *all_comp_units, *n_allocated);
8606 (*all_comp_units)[*n_comp_units] = this_cu;
8609 info_ptr = info_ptr + this_cu->length;
8613 /* Create a list of all compilation units in OBJFILE.
8614 This is only done for -readnow and building partial symtabs. */
8617 create_all_comp_units (struct dwarf2_per_objfile *dwarf2_per_objfile)
8621 struct dwarf2_per_cu_data **all_comp_units;
8622 struct dwz_file *dwz;
8623 struct objfile *objfile = dwarf2_per_objfile->objfile;
8627 all_comp_units = XNEWVEC (struct dwarf2_per_cu_data *, n_allocated);
8629 read_comp_units_from_section (dwarf2_per_objfile, &dwarf2_per_objfile->info,
8630 &dwarf2_per_objfile->abbrev, 0,
8631 &n_allocated, &n_comp_units, &all_comp_units);
8633 dwz = dwarf2_get_dwz_file (dwarf2_per_objfile);
8635 read_comp_units_from_section (dwarf2_per_objfile, &dwz->info, &dwz->abbrev,
8636 1, &n_allocated, &n_comp_units,
8639 dwarf2_per_objfile->all_comp_units = XOBNEWVEC (&objfile->objfile_obstack,
8640 struct dwarf2_per_cu_data *,
8642 memcpy (dwarf2_per_objfile->all_comp_units, all_comp_units,
8643 n_comp_units * sizeof (struct dwarf2_per_cu_data *));
8644 xfree (all_comp_units);
8645 dwarf2_per_objfile->n_comp_units = n_comp_units;
8648 /* Process all loaded DIEs for compilation unit CU, starting at
8649 FIRST_DIE. The caller should pass SET_ADDRMAP == 1 if the compilation
8650 unit DIE did not have PC info (DW_AT_low_pc and DW_AT_high_pc, or
8651 DW_AT_ranges). See the comments of add_partial_subprogram on how
8652 SET_ADDRMAP is used and how *LOWPC and *HIGHPC are updated. */
8655 scan_partial_symbols (struct partial_die_info *first_die, CORE_ADDR *lowpc,
8656 CORE_ADDR *highpc, int set_addrmap,
8657 struct dwarf2_cu *cu)
8659 struct partial_die_info *pdi;
8661 /* Now, march along the PDI's, descending into ones which have
8662 interesting children but skipping the children of the other ones,
8663 until we reach the end of the compilation unit. */
8671 /* Anonymous namespaces or modules have no name but have interesting
8672 children, so we need to look at them. Ditto for anonymous
8675 if (pdi->name != NULL || pdi->tag == DW_TAG_namespace
8676 || pdi->tag == DW_TAG_module || pdi->tag == DW_TAG_enumeration_type
8677 || pdi->tag == DW_TAG_imported_unit
8678 || pdi->tag == DW_TAG_inlined_subroutine)
8682 case DW_TAG_subprogram:
8683 case DW_TAG_inlined_subroutine:
8684 add_partial_subprogram (pdi, lowpc, highpc, set_addrmap, cu);
8686 case DW_TAG_constant:
8687 case DW_TAG_variable:
8688 case DW_TAG_typedef:
8689 case DW_TAG_union_type:
8690 if (!pdi->is_declaration)
8692 add_partial_symbol (pdi, cu);
8695 case DW_TAG_class_type:
8696 case DW_TAG_interface_type:
8697 case DW_TAG_structure_type:
8698 if (!pdi->is_declaration)
8700 add_partial_symbol (pdi, cu);
8702 if ((cu->language == language_rust
8703 || cu->language == language_cplus) && pdi->has_children)
8704 scan_partial_symbols (pdi->die_child, lowpc, highpc,
8707 case DW_TAG_enumeration_type:
8708 if (!pdi->is_declaration)
8709 add_partial_enumeration (pdi, cu);
8711 case DW_TAG_base_type:
8712 case DW_TAG_subrange_type:
8713 /* File scope base type definitions are added to the partial
8715 add_partial_symbol (pdi, cu);
8717 case DW_TAG_namespace:
8718 add_partial_namespace (pdi, lowpc, highpc, set_addrmap, cu);
8721 add_partial_module (pdi, lowpc, highpc, set_addrmap, cu);
8723 case DW_TAG_imported_unit:
8725 struct dwarf2_per_cu_data *per_cu;
8727 /* For now we don't handle imported units in type units. */
8728 if (cu->per_cu->is_debug_types)
8730 error (_("Dwarf Error: DW_TAG_imported_unit is not"
8731 " supported in type units [in module %s]"),
8732 objfile_name (cu->per_cu->dwarf2_per_objfile->objfile));
8735 per_cu = dwarf2_find_containing_comp_unit
8736 (pdi->d.sect_off, pdi->is_dwz,
8737 cu->per_cu->dwarf2_per_objfile);
8739 /* Go read the partial unit, if needed. */
8740 if (per_cu->v.psymtab == NULL)
8741 process_psymtab_comp_unit (per_cu, 1, cu->language);
8743 VEC_safe_push (dwarf2_per_cu_ptr,
8744 cu->per_cu->imported_symtabs, per_cu);
8747 case DW_TAG_imported_declaration:
8748 add_partial_symbol (pdi, cu);
8755 /* If the die has a sibling, skip to the sibling. */
8757 pdi = pdi->die_sibling;
8761 /* Functions used to compute the fully scoped name of a partial DIE.
8763 Normally, this is simple. For C++, the parent DIE's fully scoped
8764 name is concatenated with "::" and the partial DIE's name.
8765 Enumerators are an exception; they use the scope of their parent
8766 enumeration type, i.e. the name of the enumeration type is not
8767 prepended to the enumerator.
8769 There are two complexities. One is DW_AT_specification; in this
8770 case "parent" means the parent of the target of the specification,
8771 instead of the direct parent of the DIE. The other is compilers
8772 which do not emit DW_TAG_namespace; in this case we try to guess
8773 the fully qualified name of structure types from their members'
8774 linkage names. This must be done using the DIE's children rather
8775 than the children of any DW_AT_specification target. We only need
8776 to do this for structures at the top level, i.e. if the target of
8777 any DW_AT_specification (if any; otherwise the DIE itself) does not
8780 /* Compute the scope prefix associated with PDI's parent, in
8781 compilation unit CU. The result will be allocated on CU's
8782 comp_unit_obstack, or a copy of the already allocated PDI->NAME
8783 field. NULL is returned if no prefix is necessary. */
8785 partial_die_parent_scope (struct partial_die_info *pdi,
8786 struct dwarf2_cu *cu)
8788 const char *grandparent_scope;
8789 struct partial_die_info *parent, *real_pdi;
8791 /* We need to look at our parent DIE; if we have a DW_AT_specification,
8792 then this means the parent of the specification DIE. */
8795 while (real_pdi->has_specification)
8796 real_pdi = find_partial_die (real_pdi->spec_offset,
8797 real_pdi->spec_is_dwz, cu);
8799 parent = real_pdi->die_parent;
8803 if (parent->scope_set)
8804 return parent->scope;
8808 grandparent_scope = partial_die_parent_scope (parent, cu);
8810 /* GCC 4.0 and 4.1 had a bug (PR c++/28460) where they generated bogus
8811 DW_TAG_namespace DIEs with a name of "::" for the global namespace.
8812 Work around this problem here. */
8813 if (cu->language == language_cplus
8814 && parent->tag == DW_TAG_namespace
8815 && strcmp (parent->name, "::") == 0
8816 && grandparent_scope == NULL)
8818 parent->scope = NULL;
8819 parent->scope_set = 1;
8823 if (pdi->tag == DW_TAG_enumerator)
8824 /* Enumerators should not get the name of the enumeration as a prefix. */
8825 parent->scope = grandparent_scope;
8826 else if (parent->tag == DW_TAG_namespace
8827 || parent->tag == DW_TAG_module
8828 || parent->tag == DW_TAG_structure_type
8829 || parent->tag == DW_TAG_class_type
8830 || parent->tag == DW_TAG_interface_type
8831 || parent->tag == DW_TAG_union_type
8832 || parent->tag == DW_TAG_enumeration_type)
8834 if (grandparent_scope == NULL)
8835 parent->scope = parent->name;
8837 parent->scope = typename_concat (&cu->comp_unit_obstack,
8839 parent->name, 0, cu);
8843 /* FIXME drow/2004-04-01: What should we be doing with
8844 function-local names? For partial symbols, we should probably be
8846 complaint (&symfile_complaints,
8847 _("unhandled containing DIE tag %d for DIE at %s"),
8848 parent->tag, sect_offset_str (pdi->sect_off));
8849 parent->scope = grandparent_scope;
8852 parent->scope_set = 1;
8853 return parent->scope;
8856 /* Return the fully scoped name associated with PDI, from compilation unit
8857 CU. The result will be allocated with malloc. */
8860 partial_die_full_name (struct partial_die_info *pdi,
8861 struct dwarf2_cu *cu)
8863 const char *parent_scope;
8865 /* If this is a template instantiation, we can not work out the
8866 template arguments from partial DIEs. So, unfortunately, we have
8867 to go through the full DIEs. At least any work we do building
8868 types here will be reused if full symbols are loaded later. */
8869 if (pdi->has_template_arguments)
8873 if (pdi->name != NULL && strchr (pdi->name, '<') == NULL)
8875 struct die_info *die;
8876 struct attribute attr;
8877 struct dwarf2_cu *ref_cu = cu;
8879 /* DW_FORM_ref_addr is using section offset. */
8880 attr.name = (enum dwarf_attribute) 0;
8881 attr.form = DW_FORM_ref_addr;
8882 attr.u.unsnd = to_underlying (pdi->sect_off);
8883 die = follow_die_ref (NULL, &attr, &ref_cu);
8885 return xstrdup (dwarf2_full_name (NULL, die, ref_cu));
8889 parent_scope = partial_die_parent_scope (pdi, cu);
8890 if (parent_scope == NULL)
8893 return typename_concat (NULL, parent_scope, pdi->name, 0, cu);
8897 add_partial_symbol (struct partial_die_info *pdi, struct dwarf2_cu *cu)
8899 struct dwarf2_per_objfile *dwarf2_per_objfile
8900 = cu->per_cu->dwarf2_per_objfile;
8901 struct objfile *objfile = dwarf2_per_objfile->objfile;
8902 struct gdbarch *gdbarch = get_objfile_arch (objfile);
8904 const char *actual_name = NULL;
8906 char *built_actual_name;
8908 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
8910 built_actual_name = partial_die_full_name (pdi, cu);
8911 if (built_actual_name != NULL)
8912 actual_name = built_actual_name;
8914 if (actual_name == NULL)
8915 actual_name = pdi->name;
8919 case DW_TAG_inlined_subroutine:
8920 case DW_TAG_subprogram:
8921 addr = gdbarch_adjust_dwarf2_addr (gdbarch, pdi->lowpc + baseaddr);
8922 if (pdi->is_external || cu->language == language_ada)
8924 /* brobecker/2007-12-26: Normally, only "external" DIEs are part
8925 of the global scope. But in Ada, we want to be able to access
8926 nested procedures globally. So all Ada subprograms are stored
8927 in the global scope. */
8928 add_psymbol_to_list (actual_name, strlen (actual_name),
8929 built_actual_name != NULL,
8930 VAR_DOMAIN, LOC_BLOCK,
8931 &objfile->global_psymbols,
8932 addr, cu->language, objfile);
8936 add_psymbol_to_list (actual_name, strlen (actual_name),
8937 built_actual_name != NULL,
8938 VAR_DOMAIN, LOC_BLOCK,
8939 &objfile->static_psymbols,
8940 addr, cu->language, objfile);
8943 if (pdi->main_subprogram && actual_name != NULL)
8944 set_objfile_main_name (objfile, actual_name, cu->language);
8946 case DW_TAG_constant:
8948 std::vector<partial_symbol *> *list;
8950 if (pdi->is_external)
8951 list = &objfile->global_psymbols;
8953 list = &objfile->static_psymbols;
8954 add_psymbol_to_list (actual_name, strlen (actual_name),
8955 built_actual_name != NULL, VAR_DOMAIN, LOC_STATIC,
8956 list, 0, cu->language, objfile);
8959 case DW_TAG_variable:
8961 addr = decode_locdesc (pdi->d.locdesc, cu);
8965 && !dwarf2_per_objfile->has_section_at_zero)
8967 /* A global or static variable may also have been stripped
8968 out by the linker if unused, in which case its address
8969 will be nullified; do not add such variables into partial
8970 symbol table then. */
8972 else if (pdi->is_external)
8975 Don't enter into the minimal symbol tables as there is
8976 a minimal symbol table entry from the ELF symbols already.
8977 Enter into partial symbol table if it has a location
8978 descriptor or a type.
8979 If the location descriptor is missing, new_symbol will create
8980 a LOC_UNRESOLVED symbol, the address of the variable will then
8981 be determined from the minimal symbol table whenever the variable
8983 The address for the partial symbol table entry is not
8984 used by GDB, but it comes in handy for debugging partial symbol
8987 if (pdi->d.locdesc || pdi->has_type)
8988 add_psymbol_to_list (actual_name, strlen (actual_name),
8989 built_actual_name != NULL,
8990 VAR_DOMAIN, LOC_STATIC,
8991 &objfile->global_psymbols,
8993 cu->language, objfile);
8997 int has_loc = pdi->d.locdesc != NULL;
8999 /* Static Variable. Skip symbols whose value we cannot know (those
9000 without location descriptors or constant values). */
9001 if (!has_loc && !pdi->has_const_value)
9003 xfree (built_actual_name);
9007 add_psymbol_to_list (actual_name, strlen (actual_name),
9008 built_actual_name != NULL,
9009 VAR_DOMAIN, LOC_STATIC,
9010 &objfile->static_psymbols,
9011 has_loc ? addr + baseaddr : (CORE_ADDR) 0,
9012 cu->language, objfile);
9015 case DW_TAG_typedef:
9016 case DW_TAG_base_type:
9017 case DW_TAG_subrange_type:
9018 add_psymbol_to_list (actual_name, strlen (actual_name),
9019 built_actual_name != NULL,
9020 VAR_DOMAIN, LOC_TYPEDEF,
9021 &objfile->static_psymbols,
9022 0, cu->language, objfile);
9024 case DW_TAG_imported_declaration:
9025 case DW_TAG_namespace:
9026 add_psymbol_to_list (actual_name, strlen (actual_name),
9027 built_actual_name != NULL,
9028 VAR_DOMAIN, LOC_TYPEDEF,
9029 &objfile->global_psymbols,
9030 0, cu->language, objfile);
9033 add_psymbol_to_list (actual_name, strlen (actual_name),
9034 built_actual_name != NULL,
9035 MODULE_DOMAIN, LOC_TYPEDEF,
9036 &objfile->global_psymbols,
9037 0, cu->language, objfile);
9039 case DW_TAG_class_type:
9040 case DW_TAG_interface_type:
9041 case DW_TAG_structure_type:
9042 case DW_TAG_union_type:
9043 case DW_TAG_enumeration_type:
9044 /* Skip external references. The DWARF standard says in the section
9045 about "Structure, Union, and Class Type Entries": "An incomplete
9046 structure, union or class type is represented by a structure,
9047 union or class entry that does not have a byte size attribute
9048 and that has a DW_AT_declaration attribute." */
9049 if (!pdi->has_byte_size && pdi->is_declaration)
9051 xfree (built_actual_name);
9055 /* NOTE: carlton/2003-10-07: See comment in new_symbol about
9056 static vs. global. */
9057 add_psymbol_to_list (actual_name, strlen (actual_name),
9058 built_actual_name != NULL,
9059 STRUCT_DOMAIN, LOC_TYPEDEF,
9060 cu->language == language_cplus
9061 ? &objfile->global_psymbols
9062 : &objfile->static_psymbols,
9063 0, cu->language, objfile);
9066 case DW_TAG_enumerator:
9067 add_psymbol_to_list (actual_name, strlen (actual_name),
9068 built_actual_name != NULL,
9069 VAR_DOMAIN, LOC_CONST,
9070 cu->language == language_cplus
9071 ? &objfile->global_psymbols
9072 : &objfile->static_psymbols,
9073 0, cu->language, objfile);
9079 xfree (built_actual_name);
9082 /* Read a partial die corresponding to a namespace; also, add a symbol
9083 corresponding to that namespace to the symbol table. NAMESPACE is
9084 the name of the enclosing namespace. */
9087 add_partial_namespace (struct partial_die_info *pdi,
9088 CORE_ADDR *lowpc, CORE_ADDR *highpc,
9089 int set_addrmap, struct dwarf2_cu *cu)
9091 /* Add a symbol for the namespace. */
9093 add_partial_symbol (pdi, cu);
9095 /* Now scan partial symbols in that namespace. */
9097 if (pdi->has_children)
9098 scan_partial_symbols (pdi->die_child, lowpc, highpc, set_addrmap, cu);
9101 /* Read a partial die corresponding to a Fortran module. */
9104 add_partial_module (struct partial_die_info *pdi, CORE_ADDR *lowpc,
9105 CORE_ADDR *highpc, int set_addrmap, struct dwarf2_cu *cu)
9107 /* Add a symbol for the namespace. */
9109 add_partial_symbol (pdi, cu);
9111 /* Now scan partial symbols in that module. */
9113 if (pdi->has_children)
9114 scan_partial_symbols (pdi->die_child, lowpc, highpc, set_addrmap, cu);
9117 /* Read a partial die corresponding to a subprogram or an inlined
9118 subprogram and create a partial symbol for that subprogram.
9119 When the CU language allows it, this routine also defines a partial
9120 symbol for each nested subprogram that this subprogram contains.
9121 If SET_ADDRMAP is true, record the covered ranges in the addrmap.
9122 Set *LOWPC and *HIGHPC to the lowest and highest PC values found in PDI.
9124 PDI may also be a lexical block, in which case we simply search
9125 recursively for subprograms defined inside that lexical block.
9126 Again, this is only performed when the CU language allows this
9127 type of definitions. */
9130 add_partial_subprogram (struct partial_die_info *pdi,
9131 CORE_ADDR *lowpc, CORE_ADDR *highpc,
9132 int set_addrmap, struct dwarf2_cu *cu)
9134 if (pdi->tag == DW_TAG_subprogram || pdi->tag == DW_TAG_inlined_subroutine)
9136 if (pdi->has_pc_info)
9138 if (pdi->lowpc < *lowpc)
9139 *lowpc = pdi->lowpc;
9140 if (pdi->highpc > *highpc)
9141 *highpc = pdi->highpc;
9144 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
9145 struct gdbarch *gdbarch = get_objfile_arch (objfile);
9150 baseaddr = ANOFFSET (objfile->section_offsets,
9151 SECT_OFF_TEXT (objfile));
9152 lowpc = gdbarch_adjust_dwarf2_addr (gdbarch,
9153 pdi->lowpc + baseaddr);
9154 highpc = gdbarch_adjust_dwarf2_addr (gdbarch,
9155 pdi->highpc + baseaddr);
9156 addrmap_set_empty (objfile->psymtabs_addrmap, lowpc, highpc - 1,
9157 cu->per_cu->v.psymtab);
9161 if (pdi->has_pc_info || (!pdi->is_external && pdi->may_be_inlined))
9163 if (!pdi->is_declaration)
9164 /* Ignore subprogram DIEs that do not have a name, they are
9165 illegal. Do not emit a complaint at this point, we will
9166 do so when we convert this psymtab into a symtab. */
9168 add_partial_symbol (pdi, cu);
9172 if (! pdi->has_children)
9175 if (cu->language == language_ada)
9177 pdi = pdi->die_child;
9181 if (pdi->tag == DW_TAG_subprogram
9182 || pdi->tag == DW_TAG_inlined_subroutine
9183 || pdi->tag == DW_TAG_lexical_block)
9184 add_partial_subprogram (pdi, lowpc, highpc, set_addrmap, cu);
9185 pdi = pdi->die_sibling;
9190 /* Read a partial die corresponding to an enumeration type. */
9193 add_partial_enumeration (struct partial_die_info *enum_pdi,
9194 struct dwarf2_cu *cu)
9196 struct partial_die_info *pdi;
9198 if (enum_pdi->name != NULL)
9199 add_partial_symbol (enum_pdi, cu);
9201 pdi = enum_pdi->die_child;
9204 if (pdi->tag != DW_TAG_enumerator || pdi->name == NULL)
9205 complaint (&symfile_complaints, _("malformed enumerator DIE ignored"));
9207 add_partial_symbol (pdi, cu);
9208 pdi = pdi->die_sibling;
9212 /* Return the initial uleb128 in the die at INFO_PTR. */
9215 peek_abbrev_code (bfd *abfd, const gdb_byte *info_ptr)
9217 unsigned int bytes_read;
9219 return read_unsigned_leb128 (abfd, info_ptr, &bytes_read);
9222 /* Read the initial uleb128 in the die at INFO_PTR in compilation unit
9223 READER::CU. Use READER::ABBREV_TABLE to lookup any abbreviation.
9225 Return the corresponding abbrev, or NULL if the number is zero (indicating
9226 an empty DIE). In either case *BYTES_READ will be set to the length of
9227 the initial number. */
9229 static struct abbrev_info *
9230 peek_die_abbrev (const die_reader_specs &reader,
9231 const gdb_byte *info_ptr, unsigned int *bytes_read)
9233 dwarf2_cu *cu = reader.cu;
9234 bfd *abfd = cu->per_cu->dwarf2_per_objfile->objfile->obfd;
9235 unsigned int abbrev_number
9236 = read_unsigned_leb128 (abfd, info_ptr, bytes_read);
9238 if (abbrev_number == 0)
9241 abbrev_info *abbrev = reader.abbrev_table->lookup_abbrev (abbrev_number);
9244 error (_("Dwarf Error: Could not find abbrev number %d in %s"
9245 " at offset %s [in module %s]"),
9246 abbrev_number, cu->per_cu->is_debug_types ? "TU" : "CU",
9247 sect_offset_str (cu->header.sect_off), bfd_get_filename (abfd));
9253 /* Scan the debug information for CU starting at INFO_PTR in buffer BUFFER.
9254 Returns a pointer to the end of a series of DIEs, terminated by an empty
9255 DIE. Any children of the skipped DIEs will also be skipped. */
9257 static const gdb_byte *
9258 skip_children (const struct die_reader_specs *reader, const gdb_byte *info_ptr)
9262 unsigned int bytes_read;
9263 abbrev_info *abbrev = peek_die_abbrev (*reader, info_ptr, &bytes_read);
9266 return info_ptr + bytes_read;
9268 info_ptr = skip_one_die (reader, info_ptr + bytes_read, abbrev);
9272 /* Scan the debug information for CU starting at INFO_PTR in buffer BUFFER.
9273 INFO_PTR should point just after the initial uleb128 of a DIE, and the
9274 abbrev corresponding to that skipped uleb128 should be passed in
9275 ABBREV. Returns a pointer to this DIE's sibling, skipping any
9278 static const gdb_byte *
9279 skip_one_die (const struct die_reader_specs *reader, const gdb_byte *info_ptr,
9280 struct abbrev_info *abbrev)
9282 unsigned int bytes_read;
9283 struct attribute attr;
9284 bfd *abfd = reader->abfd;
9285 struct dwarf2_cu *cu = reader->cu;
9286 const gdb_byte *buffer = reader->buffer;
9287 const gdb_byte *buffer_end = reader->buffer_end;
9288 unsigned int form, i;
9290 for (i = 0; i < abbrev->num_attrs; i++)
9292 /* The only abbrev we care about is DW_AT_sibling. */
9293 if (abbrev->attrs[i].name == DW_AT_sibling)
9295 read_attribute (reader, &attr, &abbrev->attrs[i], info_ptr);
9296 if (attr.form == DW_FORM_ref_addr)
9297 complaint (&symfile_complaints,
9298 _("ignoring absolute DW_AT_sibling"));
9301 sect_offset off = dwarf2_get_ref_die_offset (&attr);
9302 const gdb_byte *sibling_ptr = buffer + to_underlying (off);
9304 if (sibling_ptr < info_ptr)
9305 complaint (&symfile_complaints,
9306 _("DW_AT_sibling points backwards"));
9307 else if (sibling_ptr > reader->buffer_end)
9308 dwarf2_section_buffer_overflow_complaint (reader->die_section);
9314 /* If it isn't DW_AT_sibling, skip this attribute. */
9315 form = abbrev->attrs[i].form;
9319 case DW_FORM_ref_addr:
9320 /* In DWARF 2, DW_FORM_ref_addr is address sized; in DWARF 3
9321 and later it is offset sized. */
9322 if (cu->header.version == 2)
9323 info_ptr += cu->header.addr_size;
9325 info_ptr += cu->header.offset_size;
9327 case DW_FORM_GNU_ref_alt:
9328 info_ptr += cu->header.offset_size;
9331 info_ptr += cu->header.addr_size;
9338 case DW_FORM_flag_present:
9339 case DW_FORM_implicit_const:
9351 case DW_FORM_ref_sig8:
9354 case DW_FORM_data16:
9357 case DW_FORM_string:
9358 read_direct_string (abfd, info_ptr, &bytes_read);
9359 info_ptr += bytes_read;
9361 case DW_FORM_sec_offset:
9363 case DW_FORM_GNU_strp_alt:
9364 info_ptr += cu->header.offset_size;
9366 case DW_FORM_exprloc:
9368 info_ptr += read_unsigned_leb128 (abfd, info_ptr, &bytes_read);
9369 info_ptr += bytes_read;
9371 case DW_FORM_block1:
9372 info_ptr += 1 + read_1_byte (abfd, info_ptr);
9374 case DW_FORM_block2:
9375 info_ptr += 2 + read_2_bytes (abfd, info_ptr);
9377 case DW_FORM_block4:
9378 info_ptr += 4 + read_4_bytes (abfd, info_ptr);
9382 case DW_FORM_ref_udata:
9383 case DW_FORM_GNU_addr_index:
9384 case DW_FORM_GNU_str_index:
9385 info_ptr = safe_skip_leb128 (info_ptr, buffer_end);
9387 case DW_FORM_indirect:
9388 form = read_unsigned_leb128 (abfd, info_ptr, &bytes_read);
9389 info_ptr += bytes_read;
9390 /* We need to continue parsing from here, so just go back to
9392 goto skip_attribute;
9395 error (_("Dwarf Error: Cannot handle %s "
9396 "in DWARF reader [in module %s]"),
9397 dwarf_form_name (form),
9398 bfd_get_filename (abfd));
9402 if (abbrev->has_children)
9403 return skip_children (reader, info_ptr);
9408 /* Locate ORIG_PDI's sibling.
9409 INFO_PTR should point to the start of the next DIE after ORIG_PDI. */
9411 static const gdb_byte *
9412 locate_pdi_sibling (const struct die_reader_specs *reader,
9413 struct partial_die_info *orig_pdi,
9414 const gdb_byte *info_ptr)
9416 /* Do we know the sibling already? */
9418 if (orig_pdi->sibling)
9419 return orig_pdi->sibling;
9421 /* Are there any children to deal with? */
9423 if (!orig_pdi->has_children)
9426 /* Skip the children the long way. */
9428 return skip_children (reader, info_ptr);
9431 /* Expand this partial symbol table into a full symbol table. SELF is
9435 dwarf2_read_symtab (struct partial_symtab *self,
9436 struct objfile *objfile)
9438 struct dwarf2_per_objfile *dwarf2_per_objfile
9439 = get_dwarf2_per_objfile (objfile);
9443 warning (_("bug: psymtab for %s is already read in."),
9450 printf_filtered (_("Reading in symbols for %s..."),
9452 gdb_flush (gdb_stdout);
9455 /* If this psymtab is constructed from a debug-only objfile, the
9456 has_section_at_zero flag will not necessarily be correct. We
9457 can get the correct value for this flag by looking at the data
9458 associated with the (presumably stripped) associated objfile. */
9459 if (objfile->separate_debug_objfile_backlink)
9461 struct dwarf2_per_objfile *dpo_backlink
9462 = get_dwarf2_per_objfile (objfile->separate_debug_objfile_backlink);
9464 dwarf2_per_objfile->has_section_at_zero
9465 = dpo_backlink->has_section_at_zero;
9468 dwarf2_per_objfile->reading_partial_symbols = 0;
9470 psymtab_to_symtab_1 (self);
9472 /* Finish up the debug error message. */
9474 printf_filtered (_("done.\n"));
9477 process_cu_includes (dwarf2_per_objfile);
9480 /* Reading in full CUs. */
9482 /* Add PER_CU to the queue. */
9485 queue_comp_unit (struct dwarf2_per_cu_data *per_cu,
9486 enum language pretend_language)
9488 struct dwarf2_queue_item *item;
9491 item = XNEW (struct dwarf2_queue_item);
9492 item->per_cu = per_cu;
9493 item->pretend_language = pretend_language;
9496 if (dwarf2_queue == NULL)
9497 dwarf2_queue = item;
9499 dwarf2_queue_tail->next = item;
9501 dwarf2_queue_tail = item;
9504 /* If PER_CU is not yet queued, add it to the queue.
9505 If DEPENDENT_CU is non-NULL, it has a reference to PER_CU so add a
9507 The result is non-zero if PER_CU was queued, otherwise the result is zero
9508 meaning either PER_CU is already queued or it is already loaded.
9510 N.B. There is an invariant here that if a CU is queued then it is loaded.
9511 The caller is required to load PER_CU if we return non-zero. */
9514 maybe_queue_comp_unit (struct dwarf2_cu *dependent_cu,
9515 struct dwarf2_per_cu_data *per_cu,
9516 enum language pretend_language)
9518 /* We may arrive here during partial symbol reading, if we need full
9519 DIEs to process an unusual case (e.g. template arguments). Do
9520 not queue PER_CU, just tell our caller to load its DIEs. */
9521 if (per_cu->dwarf2_per_objfile->reading_partial_symbols)
9523 if (per_cu->cu == NULL || per_cu->cu->dies == NULL)
9528 /* Mark the dependence relation so that we don't flush PER_CU
9530 if (dependent_cu != NULL)
9531 dwarf2_add_dependence (dependent_cu, per_cu);
9533 /* If it's already on the queue, we have nothing to do. */
9537 /* If the compilation unit is already loaded, just mark it as
9539 if (per_cu->cu != NULL)
9541 per_cu->cu->last_used = 0;
9545 /* Add it to the queue. */
9546 queue_comp_unit (per_cu, pretend_language);
9551 /* Process the queue. */
9554 process_queue (struct dwarf2_per_objfile *dwarf2_per_objfile)
9556 struct dwarf2_queue_item *item, *next_item;
9558 if (dwarf_read_debug)
9560 fprintf_unfiltered (gdb_stdlog,
9561 "Expanding one or more symtabs of objfile %s ...\n",
9562 objfile_name (dwarf2_per_objfile->objfile));
9565 /* The queue starts out with one item, but following a DIE reference
9566 may load a new CU, adding it to the end of the queue. */
9567 for (item = dwarf2_queue; item != NULL; dwarf2_queue = item = next_item)
9569 if ((dwarf2_per_objfile->using_index
9570 ? !item->per_cu->v.quick->compunit_symtab
9571 : (item->per_cu->v.psymtab && !item->per_cu->v.psymtab->readin))
9572 /* Skip dummy CUs. */
9573 && item->per_cu->cu != NULL)
9575 struct dwarf2_per_cu_data *per_cu = item->per_cu;
9576 unsigned int debug_print_threshold;
9579 if (per_cu->is_debug_types)
9581 struct signatured_type *sig_type =
9582 (struct signatured_type *) per_cu;
9584 sprintf (buf, "TU %s at offset %s",
9585 hex_string (sig_type->signature),
9586 sect_offset_str (per_cu->sect_off));
9587 /* There can be 100s of TUs.
9588 Only print them in verbose mode. */
9589 debug_print_threshold = 2;
9593 sprintf (buf, "CU at offset %s",
9594 sect_offset_str (per_cu->sect_off));
9595 debug_print_threshold = 1;
9598 if (dwarf_read_debug >= debug_print_threshold)
9599 fprintf_unfiltered (gdb_stdlog, "Expanding symtab of %s\n", buf);
9601 if (per_cu->is_debug_types)
9602 process_full_type_unit (per_cu, item->pretend_language);
9604 process_full_comp_unit (per_cu, item->pretend_language);
9606 if (dwarf_read_debug >= debug_print_threshold)
9607 fprintf_unfiltered (gdb_stdlog, "Done expanding %s\n", buf);
9610 item->per_cu->queued = 0;
9611 next_item = item->next;
9615 dwarf2_queue_tail = NULL;
9617 if (dwarf_read_debug)
9619 fprintf_unfiltered (gdb_stdlog, "Done expanding symtabs of %s.\n",
9620 objfile_name (dwarf2_per_objfile->objfile));
9624 /* Read in full symbols for PST, and anything it depends on. */
9627 psymtab_to_symtab_1 (struct partial_symtab *pst)
9629 struct dwarf2_per_cu_data *per_cu;
9635 for (i = 0; i < pst->number_of_dependencies; i++)
9636 if (!pst->dependencies[i]->readin
9637 && pst->dependencies[i]->user == NULL)
9639 /* Inform about additional files that need to be read in. */
9642 /* FIXME: i18n: Need to make this a single string. */
9643 fputs_filtered (" ", gdb_stdout);
9645 fputs_filtered ("and ", gdb_stdout);
9647 printf_filtered ("%s...", pst->dependencies[i]->filename);
9648 wrap_here (""); /* Flush output. */
9649 gdb_flush (gdb_stdout);
9651 psymtab_to_symtab_1 (pst->dependencies[i]);
9654 per_cu = (struct dwarf2_per_cu_data *) pst->read_symtab_private;
9658 /* It's an include file, no symbols to read for it.
9659 Everything is in the parent symtab. */
9664 dw2_do_instantiate_symtab (per_cu);
9667 /* Trivial hash function for die_info: the hash value of a DIE
9668 is its offset in .debug_info for this objfile. */
9671 die_hash (const void *item)
9673 const struct die_info *die = (const struct die_info *) item;
9675 return to_underlying (die->sect_off);
9678 /* Trivial comparison function for die_info structures: two DIEs
9679 are equal if they have the same offset. */
9682 die_eq (const void *item_lhs, const void *item_rhs)
9684 const struct die_info *die_lhs = (const struct die_info *) item_lhs;
9685 const struct die_info *die_rhs = (const struct die_info *) item_rhs;
9687 return die_lhs->sect_off == die_rhs->sect_off;
9690 /* die_reader_func for load_full_comp_unit.
9691 This is identical to read_signatured_type_reader,
9692 but is kept separate for now. */
9695 load_full_comp_unit_reader (const struct die_reader_specs *reader,
9696 const gdb_byte *info_ptr,
9697 struct die_info *comp_unit_die,
9701 struct dwarf2_cu *cu = reader->cu;
9702 enum language *language_ptr = (enum language *) data;
9704 gdb_assert (cu->die_hash == NULL);
9706 htab_create_alloc_ex (cu->header.length / 12,
9710 &cu->comp_unit_obstack,
9711 hashtab_obstack_allocate,
9712 dummy_obstack_deallocate);
9715 comp_unit_die->child = read_die_and_siblings (reader, info_ptr,
9716 &info_ptr, comp_unit_die);
9717 cu->dies = comp_unit_die;
9718 /* comp_unit_die is not stored in die_hash, no need. */
9720 /* We try not to read any attributes in this function, because not
9721 all CUs needed for references have been loaded yet, and symbol
9722 table processing isn't initialized. But we have to set the CU language,
9723 or we won't be able to build types correctly.
9724 Similarly, if we do not read the producer, we can not apply
9725 producer-specific interpretation. */
9726 prepare_one_comp_unit (cu, cu->dies, *language_ptr);
9729 /* Load the DIEs associated with PER_CU into memory. */
9732 load_full_comp_unit (struct dwarf2_per_cu_data *this_cu,
9733 enum language pretend_language)
9735 gdb_assert (! this_cu->is_debug_types);
9737 init_cutu_and_read_dies (this_cu, NULL, 1, 1,
9738 load_full_comp_unit_reader, &pretend_language);
9741 /* Add a DIE to the delayed physname list. */
9744 add_to_method_list (struct type *type, int fnfield_index, int index,
9745 const char *name, struct die_info *die,
9746 struct dwarf2_cu *cu)
9748 struct delayed_method_info mi;
9750 mi.fnfield_index = fnfield_index;
9754 cu->method_list.push_back (mi);
9757 /* Check whether [PHYSNAME, PHYSNAME+LEN) ends with a modifier like
9758 "const" / "volatile". If so, decrements LEN by the length of the
9759 modifier and return true. Otherwise return false. */
9763 check_modifier (const char *physname, size_t &len, const char (&mod)[N])
9765 size_t mod_len = sizeof (mod) - 1;
9766 if (len > mod_len && startswith (physname + (len - mod_len), mod))
9774 /* Compute the physnames of any methods on the CU's method list.
9776 The computation of method physnames is delayed in order to avoid the
9777 (bad) condition that one of the method's formal parameters is of an as yet
9781 compute_delayed_physnames (struct dwarf2_cu *cu)
9783 /* Only C++ delays computing physnames. */
9784 if (cu->method_list.empty ())
9786 gdb_assert (cu->language == language_cplus);
9788 for (struct delayed_method_info &mi : cu->method_list)
9790 const char *physname;
9791 struct fn_fieldlist *fn_flp
9792 = &TYPE_FN_FIELDLIST (mi.type, mi.fnfield_index);
9793 physname = dwarf2_physname (mi.name, mi.die, cu);
9794 TYPE_FN_FIELD_PHYSNAME (fn_flp->fn_fields, mi.index)
9795 = physname ? physname : "";
9797 /* Since there's no tag to indicate whether a method is a
9798 const/volatile overload, extract that information out of the
9800 if (physname != NULL)
9802 size_t len = strlen (physname);
9806 if (physname[len] == ')') /* shortcut */
9808 else if (check_modifier (physname, len, " const"))
9809 TYPE_FN_FIELD_CONST (fn_flp->fn_fields, mi.index) = 1;
9810 else if (check_modifier (physname, len, " volatile"))
9811 TYPE_FN_FIELD_VOLATILE (fn_flp->fn_fields, mi.index) = 1;
9818 /* The list is no longer needed. */
9819 cu->method_list.clear ();
9822 /* Go objects should be embedded in a DW_TAG_module DIE,
9823 and it's not clear if/how imported objects will appear.
9824 To keep Go support simple until that's worked out,
9825 go back through what we've read and create something usable.
9826 We could do this while processing each DIE, and feels kinda cleaner,
9827 but that way is more invasive.
9828 This is to, for example, allow the user to type "p var" or "b main"
9829 without having to specify the package name, and allow lookups
9830 of module.object to work in contexts that use the expression
9834 fixup_go_packaging (struct dwarf2_cu *cu)
9836 char *package_name = NULL;
9837 struct pending *list;
9840 for (list = global_symbols; list != NULL; list = list->next)
9842 for (i = 0; i < list->nsyms; ++i)
9844 struct symbol *sym = list->symbol[i];
9846 if (SYMBOL_LANGUAGE (sym) == language_go
9847 && SYMBOL_CLASS (sym) == LOC_BLOCK)
9849 char *this_package_name = go_symbol_package_name (sym);
9851 if (this_package_name == NULL)
9853 if (package_name == NULL)
9854 package_name = this_package_name;
9857 struct objfile *objfile
9858 = cu->per_cu->dwarf2_per_objfile->objfile;
9859 if (strcmp (package_name, this_package_name) != 0)
9860 complaint (&symfile_complaints,
9861 _("Symtab %s has objects from two different Go packages: %s and %s"),
9862 (symbol_symtab (sym) != NULL
9863 ? symtab_to_filename_for_display
9864 (symbol_symtab (sym))
9865 : objfile_name (objfile)),
9866 this_package_name, package_name);
9867 xfree (this_package_name);
9873 if (package_name != NULL)
9875 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
9876 const char *saved_package_name
9877 = (const char *) obstack_copy0 (&objfile->per_bfd->storage_obstack,
9879 strlen (package_name));
9880 struct type *type = init_type (objfile, TYPE_CODE_MODULE, 0,
9881 saved_package_name);
9884 TYPE_TAG_NAME (type) = TYPE_NAME (type);
9886 sym = allocate_symbol (objfile);
9887 SYMBOL_SET_LANGUAGE (sym, language_go, &objfile->objfile_obstack);
9888 SYMBOL_SET_NAMES (sym, saved_package_name,
9889 strlen (saved_package_name), 0, objfile);
9890 /* This is not VAR_DOMAIN because we want a way to ensure a lookup of,
9891 e.g., "main" finds the "main" module and not C's main(). */
9892 SYMBOL_DOMAIN (sym) = STRUCT_DOMAIN;
9893 SYMBOL_ACLASS_INDEX (sym) = LOC_TYPEDEF;
9894 SYMBOL_TYPE (sym) = type;
9896 add_symbol_to_list (sym, &global_symbols);
9898 xfree (package_name);
9902 /* Allocate a fully-qualified name consisting of the two parts on the
9906 rust_fully_qualify (struct obstack *obstack, const char *p1, const char *p2)
9908 return obconcat (obstack, p1, "::", p2, (char *) NULL);
9911 /* A helper that allocates a struct discriminant_info to attach to a
9914 static struct discriminant_info *
9915 alloc_discriminant_info (struct type *type, int discriminant_index,
9918 gdb_assert (TYPE_CODE (type) == TYPE_CODE_UNION);
9919 gdb_assert (discriminant_index == -1
9920 || (discriminant_index >= 0
9921 && discriminant_index < TYPE_NFIELDS (type)));
9922 gdb_assert (default_index == -1
9923 || (default_index >= 0 && default_index < TYPE_NFIELDS (type)));
9925 TYPE_FLAG_DISCRIMINATED_UNION (type) = 1;
9927 struct discriminant_info *disc
9928 = ((struct discriminant_info *)
9930 offsetof (struct discriminant_info, discriminants)
9931 + TYPE_NFIELDS (type) * sizeof (disc->discriminants[0])));
9932 disc->default_index = default_index;
9933 disc->discriminant_index = discriminant_index;
9935 struct dynamic_prop prop;
9936 prop.kind = PROP_UNDEFINED;
9937 prop.data.baton = disc;
9939 add_dyn_prop (DYN_PROP_DISCRIMINATED, prop, type);
9944 /* Some versions of rustc emitted enums in an unusual way.
9946 Ordinary enums were emitted as unions. The first element of each
9947 structure in the union was named "RUST$ENUM$DISR". This element
9948 held the discriminant.
9950 These versions of Rust also implemented the "non-zero"
9951 optimization. When the enum had two values, and one is empty and
9952 the other holds a pointer that cannot be zero, the pointer is used
9953 as the discriminant, with a zero value meaning the empty variant.
9954 Here, the union's first member is of the form
9955 RUST$ENCODED$ENUM$<fieldno>$<fieldno>$...$<variantname>
9956 where the fieldnos are the indices of the fields that should be
9957 traversed in order to find the field (which may be several fields deep)
9958 and the variantname is the name of the variant of the case when the
9961 This function recognizes whether TYPE is of one of these forms,
9962 and, if so, smashes it to be a variant type. */
9965 quirk_rust_enum (struct type *type, struct objfile *objfile)
9967 gdb_assert (TYPE_CODE (type) == TYPE_CODE_UNION);
9969 /* We don't need to deal with empty enums. */
9970 if (TYPE_NFIELDS (type) == 0)
9973 #define RUST_ENUM_PREFIX "RUST$ENCODED$ENUM$"
9974 if (TYPE_NFIELDS (type) == 1
9975 && startswith (TYPE_FIELD_NAME (type, 0), RUST_ENUM_PREFIX))
9977 const char *name = TYPE_FIELD_NAME (type, 0) + strlen (RUST_ENUM_PREFIX);
9979 /* Decode the field name to find the offset of the
9981 ULONGEST bit_offset = 0;
9982 struct type *field_type = TYPE_FIELD_TYPE (type, 0);
9983 while (name[0] >= '0' && name[0] <= '9')
9986 unsigned long index = strtoul (name, &tail, 10);
9989 || index >= TYPE_NFIELDS (field_type)
9990 || (TYPE_FIELD_LOC_KIND (field_type, index)
9991 != FIELD_LOC_KIND_BITPOS))
9993 complaint (&symfile_complaints,
9994 _("Could not parse Rust enum encoding string \"%s\""
9996 TYPE_FIELD_NAME (type, 0),
9997 objfile_name (objfile));
10002 bit_offset += TYPE_FIELD_BITPOS (field_type, index);
10003 field_type = TYPE_FIELD_TYPE (field_type, index);
10006 /* Make a union to hold the variants. */
10007 struct type *union_type = alloc_type (objfile);
10008 TYPE_CODE (union_type) = TYPE_CODE_UNION;
10009 TYPE_NFIELDS (union_type) = 3;
10010 TYPE_FIELDS (union_type)
10011 = (struct field *) TYPE_ZALLOC (type, 3 * sizeof (struct field));
10012 TYPE_LENGTH (union_type) = TYPE_LENGTH (type);
10014 /* Put the discriminant must at index 0. */
10015 TYPE_FIELD_TYPE (union_type, 0) = field_type;
10016 TYPE_FIELD_ARTIFICIAL (union_type, 0) = 1;
10017 TYPE_FIELD_NAME (union_type, 0) = "<<discriminant>>";
10018 SET_FIELD_BITPOS (TYPE_FIELD (union_type, 0), bit_offset);
10020 /* The order of fields doesn't really matter, so put the real
10021 field at index 1 and the data-less field at index 2. */
10022 struct discriminant_info *disc
10023 = alloc_discriminant_info (union_type, 0, 1);
10024 TYPE_FIELD (union_type, 1) = TYPE_FIELD (type, 0);
10025 TYPE_FIELD_NAME (union_type, 1)
10026 = rust_last_path_segment (TYPE_NAME (TYPE_FIELD_TYPE (union_type, 1)));
10027 TYPE_NAME (TYPE_FIELD_TYPE (union_type, 1))
10028 = rust_fully_qualify (&objfile->objfile_obstack, TYPE_NAME (type),
10029 TYPE_FIELD_NAME (union_type, 1));
10031 const char *dataless_name
10032 = rust_fully_qualify (&objfile->objfile_obstack, TYPE_NAME (type),
10034 struct type *dataless_type = init_type (objfile, TYPE_CODE_VOID, 0,
10036 TYPE_FIELD_TYPE (union_type, 2) = dataless_type;
10037 /* NAME points into the original discriminant name, which
10038 already has the correct lifetime. */
10039 TYPE_FIELD_NAME (union_type, 2) = name;
10040 SET_FIELD_BITPOS (TYPE_FIELD (union_type, 2), 0);
10041 disc->discriminants[2] = 0;
10043 /* Smash this type to be a structure type. We have to do this
10044 because the type has already been recorded. */
10045 TYPE_CODE (type) = TYPE_CODE_STRUCT;
10046 TYPE_NFIELDS (type) = 1;
10048 = (struct field *) TYPE_ZALLOC (type, sizeof (struct field));
10050 /* Install the variant part. */
10051 TYPE_FIELD_TYPE (type, 0) = union_type;
10052 SET_FIELD_BITPOS (TYPE_FIELD (type, 0), 0);
10053 TYPE_FIELD_NAME (type, 0) = "<<variants>>";
10055 else if (TYPE_NFIELDS (type) == 1)
10057 /* We assume that a union with a single field is a univariant
10059 /* Smash this type to be a structure type. We have to do this
10060 because the type has already been recorded. */
10061 TYPE_CODE (type) = TYPE_CODE_STRUCT;
10063 /* Make a union to hold the variants. */
10064 struct type *union_type = alloc_type (objfile);
10065 TYPE_CODE (union_type) = TYPE_CODE_UNION;
10066 TYPE_NFIELDS (union_type) = TYPE_NFIELDS (type);
10067 TYPE_LENGTH (union_type) = TYPE_LENGTH (type);
10068 TYPE_FIELDS (union_type) = TYPE_FIELDS (type);
10070 struct type *field_type = TYPE_FIELD_TYPE (union_type, 0);
10071 const char *variant_name
10072 = rust_last_path_segment (TYPE_NAME (field_type));
10073 TYPE_FIELD_NAME (union_type, 0) = variant_name;
10074 TYPE_NAME (field_type)
10075 = rust_fully_qualify (&objfile->objfile_obstack,
10076 TYPE_NAME (type), variant_name);
10078 /* Install the union in the outer struct type. */
10079 TYPE_NFIELDS (type) = 1;
10081 = (struct field *) TYPE_ZALLOC (union_type, sizeof (struct field));
10082 TYPE_FIELD_TYPE (type, 0) = union_type;
10083 TYPE_FIELD_NAME (type, 0) = "<<variants>>";
10084 SET_FIELD_BITPOS (TYPE_FIELD (type, 0), 0);
10086 alloc_discriminant_info (union_type, -1, 0);
10090 struct type *disr_type = nullptr;
10091 for (int i = 0; i < TYPE_NFIELDS (type); ++i)
10093 disr_type = TYPE_FIELD_TYPE (type, i);
10095 if (TYPE_NFIELDS (disr_type) == 0)
10097 /* Could be data-less variant, so keep going. */
10099 else if (strcmp (TYPE_FIELD_NAME (disr_type, 0),
10100 "RUST$ENUM$DISR") != 0)
10102 /* Not a Rust enum. */
10112 /* If we got here without a discriminant, then it's probably
10114 if (disr_type == nullptr)
10117 /* Smash this type to be a structure type. We have to do this
10118 because the type has already been recorded. */
10119 TYPE_CODE (type) = TYPE_CODE_STRUCT;
10121 /* Make a union to hold the variants. */
10122 struct field *disr_field = &TYPE_FIELD (disr_type, 0);
10123 struct type *union_type = alloc_type (objfile);
10124 TYPE_CODE (union_type) = TYPE_CODE_UNION;
10125 TYPE_NFIELDS (union_type) = 1 + TYPE_NFIELDS (type);
10126 TYPE_LENGTH (union_type) = TYPE_LENGTH (type);
10127 TYPE_FIELDS (union_type)
10128 = (struct field *) TYPE_ZALLOC (union_type,
10129 (TYPE_NFIELDS (union_type)
10130 * sizeof (struct field)));
10132 memcpy (TYPE_FIELDS (union_type) + 1, TYPE_FIELDS (type),
10133 TYPE_NFIELDS (type) * sizeof (struct field));
10135 /* Install the discriminant at index 0 in the union. */
10136 TYPE_FIELD (union_type, 0) = *disr_field;
10137 TYPE_FIELD_ARTIFICIAL (union_type, 0) = 1;
10138 TYPE_FIELD_NAME (union_type, 0) = "<<discriminant>>";
10140 /* Install the union in the outer struct type. */
10141 TYPE_FIELD_TYPE (type, 0) = union_type;
10142 TYPE_FIELD_NAME (type, 0) = "<<variants>>";
10143 TYPE_NFIELDS (type) = 1;
10145 /* Set the size and offset of the union type. */
10146 SET_FIELD_BITPOS (TYPE_FIELD (type, 0), 0);
10148 /* We need a way to find the correct discriminant given a
10149 variant name. For convenience we build a map here. */
10150 struct type *enum_type = FIELD_TYPE (*disr_field);
10151 std::unordered_map<std::string, ULONGEST> discriminant_map;
10152 for (int i = 0; i < TYPE_NFIELDS (enum_type); ++i)
10154 if (TYPE_FIELD_LOC_KIND (enum_type, i) == FIELD_LOC_KIND_ENUMVAL)
10157 = rust_last_path_segment (TYPE_FIELD_NAME (enum_type, i));
10158 discriminant_map[name] = TYPE_FIELD_ENUMVAL (enum_type, i);
10162 int n_fields = TYPE_NFIELDS (union_type);
10163 struct discriminant_info *disc
10164 = alloc_discriminant_info (union_type, 0, -1);
10165 /* Skip the discriminant here. */
10166 for (int i = 1; i < n_fields; ++i)
10168 /* Find the final word in the name of this variant's type.
10169 That name can be used to look up the correct
10171 const char *variant_name
10172 = rust_last_path_segment (TYPE_NAME (TYPE_FIELD_TYPE (union_type,
10175 auto iter = discriminant_map.find (variant_name);
10176 if (iter != discriminant_map.end ())
10177 disc->discriminants[i] = iter->second;
10179 /* Remove the discriminant field. */
10180 struct type *sub_type = TYPE_FIELD_TYPE (union_type, i);
10181 --TYPE_NFIELDS (sub_type);
10182 ++TYPE_FIELDS (sub_type);
10183 TYPE_FIELD_NAME (union_type, i) = variant_name;
10184 TYPE_NAME (sub_type)
10185 = rust_fully_qualify (&objfile->objfile_obstack,
10186 TYPE_NAME (type), variant_name);
10191 /* Rewrite some Rust unions to be structures with variants parts. */
10194 rust_union_quirks (struct dwarf2_cu *cu)
10196 gdb_assert (cu->language == language_rust);
10197 for (struct type *type : cu->rust_unions)
10198 quirk_rust_enum (type, cu->per_cu->dwarf2_per_objfile->objfile);
10201 /* Return the symtab for PER_CU. This works properly regardless of
10202 whether we're using the index or psymtabs. */
10204 static struct compunit_symtab *
10205 get_compunit_symtab (struct dwarf2_per_cu_data *per_cu)
10207 return (per_cu->dwarf2_per_objfile->using_index
10208 ? per_cu->v.quick->compunit_symtab
10209 : per_cu->v.psymtab->compunit_symtab);
10212 /* A helper function for computing the list of all symbol tables
10213 included by PER_CU. */
10216 recursively_compute_inclusions (VEC (compunit_symtab_ptr) **result,
10217 htab_t all_children, htab_t all_type_symtabs,
10218 struct dwarf2_per_cu_data *per_cu,
10219 struct compunit_symtab *immediate_parent)
10223 struct compunit_symtab *cust;
10224 struct dwarf2_per_cu_data *iter;
10226 slot = htab_find_slot (all_children, per_cu, INSERT);
10229 /* This inclusion and its children have been processed. */
10234 /* Only add a CU if it has a symbol table. */
10235 cust = get_compunit_symtab (per_cu);
10238 /* If this is a type unit only add its symbol table if we haven't
10239 seen it yet (type unit per_cu's can share symtabs). */
10240 if (per_cu->is_debug_types)
10242 slot = htab_find_slot (all_type_symtabs, cust, INSERT);
10246 VEC_safe_push (compunit_symtab_ptr, *result, cust);
10247 if (cust->user == NULL)
10248 cust->user = immediate_parent;
10253 VEC_safe_push (compunit_symtab_ptr, *result, cust);
10254 if (cust->user == NULL)
10255 cust->user = immediate_parent;
10260 VEC_iterate (dwarf2_per_cu_ptr, per_cu->imported_symtabs, ix, iter);
10263 recursively_compute_inclusions (result, all_children,
10264 all_type_symtabs, iter, cust);
10268 /* Compute the compunit_symtab 'includes' fields for the compunit_symtab of
10272 compute_compunit_symtab_includes (struct dwarf2_per_cu_data *per_cu)
10274 gdb_assert (! per_cu->is_debug_types);
10276 if (!VEC_empty (dwarf2_per_cu_ptr, per_cu->imported_symtabs))
10279 struct dwarf2_per_cu_data *per_cu_iter;
10280 struct compunit_symtab *compunit_symtab_iter;
10281 VEC (compunit_symtab_ptr) *result_symtabs = NULL;
10282 htab_t all_children, all_type_symtabs;
10283 struct compunit_symtab *cust = get_compunit_symtab (per_cu);
10285 /* If we don't have a symtab, we can just skip this case. */
10289 all_children = htab_create_alloc (1, htab_hash_pointer, htab_eq_pointer,
10290 NULL, xcalloc, xfree);
10291 all_type_symtabs = htab_create_alloc (1, htab_hash_pointer, htab_eq_pointer,
10292 NULL, xcalloc, xfree);
10295 VEC_iterate (dwarf2_per_cu_ptr, per_cu->imported_symtabs,
10299 recursively_compute_inclusions (&result_symtabs, all_children,
10300 all_type_symtabs, per_cu_iter,
10304 /* Now we have a transitive closure of all the included symtabs. */
10305 len = VEC_length (compunit_symtab_ptr, result_symtabs);
10307 = XOBNEWVEC (&per_cu->dwarf2_per_objfile->objfile->objfile_obstack,
10308 struct compunit_symtab *, len + 1);
10310 VEC_iterate (compunit_symtab_ptr, result_symtabs, ix,
10311 compunit_symtab_iter);
10313 cust->includes[ix] = compunit_symtab_iter;
10314 cust->includes[len] = NULL;
10316 VEC_free (compunit_symtab_ptr, result_symtabs);
10317 htab_delete (all_children);
10318 htab_delete (all_type_symtabs);
10322 /* Compute the 'includes' field for the symtabs of all the CUs we just
10326 process_cu_includes (struct dwarf2_per_objfile *dwarf2_per_objfile)
10329 struct dwarf2_per_cu_data *iter;
10332 VEC_iterate (dwarf2_per_cu_ptr, dwarf2_per_objfile->just_read_cus,
10336 if (! iter->is_debug_types)
10337 compute_compunit_symtab_includes (iter);
10340 VEC_free (dwarf2_per_cu_ptr, dwarf2_per_objfile->just_read_cus);
10343 /* Generate full symbol information for PER_CU, whose DIEs have
10344 already been loaded into memory. */
10347 process_full_comp_unit (struct dwarf2_per_cu_data *per_cu,
10348 enum language pretend_language)
10350 struct dwarf2_cu *cu = per_cu->cu;
10351 struct dwarf2_per_objfile *dwarf2_per_objfile = per_cu->dwarf2_per_objfile;
10352 struct objfile *objfile = dwarf2_per_objfile->objfile;
10353 struct gdbarch *gdbarch = get_objfile_arch (objfile);
10354 CORE_ADDR lowpc, highpc;
10355 struct compunit_symtab *cust;
10356 CORE_ADDR baseaddr;
10357 struct block *static_block;
10360 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
10363 scoped_free_pendings free_pending;
10365 /* Clear the list here in case something was left over. */
10366 cu->method_list.clear ();
10368 cu->list_in_scope = &file_symbols;
10370 cu->language = pretend_language;
10371 cu->language_defn = language_def (cu->language);
10373 /* Do line number decoding in read_file_scope () */
10374 process_die (cu->dies, cu);
10376 /* For now fudge the Go package. */
10377 if (cu->language == language_go)
10378 fixup_go_packaging (cu);
10380 /* Now that we have processed all the DIEs in the CU, all the types
10381 should be complete, and it should now be safe to compute all of the
10383 compute_delayed_physnames (cu);
10385 if (cu->language == language_rust)
10386 rust_union_quirks (cu);
10388 /* Some compilers don't define a DW_AT_high_pc attribute for the
10389 compilation unit. If the DW_AT_high_pc is missing, synthesize
10390 it, by scanning the DIE's below the compilation unit. */
10391 get_scope_pc_bounds (cu->dies, &lowpc, &highpc, cu);
10393 addr = gdbarch_adjust_dwarf2_addr (gdbarch, highpc + baseaddr);
10394 static_block = end_symtab_get_static_block (addr, 0, 1);
10396 /* If the comp unit has DW_AT_ranges, it may have discontiguous ranges.
10397 Also, DW_AT_ranges may record ranges not belonging to any child DIEs
10398 (such as virtual method tables). Record the ranges in STATIC_BLOCK's
10399 addrmap to help ensure it has an accurate map of pc values belonging to
10401 dwarf2_record_block_ranges (cu->dies, static_block, baseaddr, cu);
10403 cust = end_symtab_from_static_block (static_block,
10404 SECT_OFF_TEXT (objfile), 0);
10408 int gcc_4_minor = producer_is_gcc_ge_4 (cu->producer);
10410 /* Set symtab language to language from DW_AT_language. If the
10411 compilation is from a C file generated by language preprocessors, do
10412 not set the language if it was already deduced by start_subfile. */
10413 if (!(cu->language == language_c
10414 && COMPUNIT_FILETABS (cust)->language != language_unknown))
10415 COMPUNIT_FILETABS (cust)->language = cu->language;
10417 /* GCC-4.0 has started to support -fvar-tracking. GCC-3.x still can
10418 produce DW_AT_location with location lists but it can be possibly
10419 invalid without -fvar-tracking. Still up to GCC-4.4.x incl. 4.4.0
10420 there were bugs in prologue debug info, fixed later in GCC-4.5
10421 by "unwind info for epilogues" patch (which is not directly related).
10423 For -gdwarf-4 type units LOCATIONS_VALID indication is fortunately not
10424 needed, it would be wrong due to missing DW_AT_producer there.
10426 Still one can confuse GDB by using non-standard GCC compilation
10427 options - this waits on GCC PR other/32998 (-frecord-gcc-switches).
10429 if (cu->has_loclist && gcc_4_minor >= 5)
10430 cust->locations_valid = 1;
10432 if (gcc_4_minor >= 5)
10433 cust->epilogue_unwind_valid = 1;
10435 cust->call_site_htab = cu->call_site_htab;
10438 if (dwarf2_per_objfile->using_index)
10439 per_cu->v.quick->compunit_symtab = cust;
10442 struct partial_symtab *pst = per_cu->v.psymtab;
10443 pst->compunit_symtab = cust;
10447 /* Push it for inclusion processing later. */
10448 VEC_safe_push (dwarf2_per_cu_ptr, dwarf2_per_objfile->just_read_cus, per_cu);
10451 /* Generate full symbol information for type unit PER_CU, whose DIEs have
10452 already been loaded into memory. */
10455 process_full_type_unit (struct dwarf2_per_cu_data *per_cu,
10456 enum language pretend_language)
10458 struct dwarf2_cu *cu = per_cu->cu;
10459 struct dwarf2_per_objfile *dwarf2_per_objfile = per_cu->dwarf2_per_objfile;
10460 struct objfile *objfile = dwarf2_per_objfile->objfile;
10461 struct compunit_symtab *cust;
10462 struct signatured_type *sig_type;
10464 gdb_assert (per_cu->is_debug_types);
10465 sig_type = (struct signatured_type *) per_cu;
10468 scoped_free_pendings free_pending;
10470 /* Clear the list here in case something was left over. */
10471 cu->method_list.clear ();
10473 cu->list_in_scope = &file_symbols;
10475 cu->language = pretend_language;
10476 cu->language_defn = language_def (cu->language);
10478 /* The symbol tables are set up in read_type_unit_scope. */
10479 process_die (cu->dies, cu);
10481 /* For now fudge the Go package. */
10482 if (cu->language == language_go)
10483 fixup_go_packaging (cu);
10485 /* Now that we have processed all the DIEs in the CU, all the types
10486 should be complete, and it should now be safe to compute all of the
10488 compute_delayed_physnames (cu);
10490 if (cu->language == language_rust)
10491 rust_union_quirks (cu);
10493 /* TUs share symbol tables.
10494 If this is the first TU to use this symtab, complete the construction
10495 of it with end_expandable_symtab. Otherwise, complete the addition of
10496 this TU's symbols to the existing symtab. */
10497 if (sig_type->type_unit_group->compunit_symtab == NULL)
10499 cust = end_expandable_symtab (0, SECT_OFF_TEXT (objfile));
10500 sig_type->type_unit_group->compunit_symtab = cust;
10504 /* Set symtab language to language from DW_AT_language. If the
10505 compilation is from a C file generated by language preprocessors,
10506 do not set the language if it was already deduced by
10508 if (!(cu->language == language_c
10509 && COMPUNIT_FILETABS (cust)->language != language_c))
10510 COMPUNIT_FILETABS (cust)->language = cu->language;
10515 augment_type_symtab ();
10516 cust = sig_type->type_unit_group->compunit_symtab;
10519 if (dwarf2_per_objfile->using_index)
10520 per_cu->v.quick->compunit_symtab = cust;
10523 struct partial_symtab *pst = per_cu->v.psymtab;
10524 pst->compunit_symtab = cust;
10529 /* Process an imported unit DIE. */
10532 process_imported_unit_die (struct die_info *die, struct dwarf2_cu *cu)
10534 struct attribute *attr;
10536 /* For now we don't handle imported units in type units. */
10537 if (cu->per_cu->is_debug_types)
10539 error (_("Dwarf Error: DW_TAG_imported_unit is not"
10540 " supported in type units [in module %s]"),
10541 objfile_name (cu->per_cu->dwarf2_per_objfile->objfile));
10544 attr = dwarf2_attr (die, DW_AT_import, cu);
10547 sect_offset sect_off = dwarf2_get_ref_die_offset (attr);
10548 bool is_dwz = (attr->form == DW_FORM_GNU_ref_alt || cu->per_cu->is_dwz);
10549 dwarf2_per_cu_data *per_cu
10550 = dwarf2_find_containing_comp_unit (sect_off, is_dwz,
10551 cu->per_cu->dwarf2_per_objfile);
10553 /* If necessary, add it to the queue and load its DIEs. */
10554 if (maybe_queue_comp_unit (cu, per_cu, cu->language))
10555 load_full_comp_unit (per_cu, cu->language);
10557 VEC_safe_push (dwarf2_per_cu_ptr, cu->per_cu->imported_symtabs,
10562 /* RAII object that represents a process_die scope: i.e.,
10563 starts/finishes processing a DIE. */
10564 class process_die_scope
10567 process_die_scope (die_info *die, dwarf2_cu *cu)
10568 : m_die (die), m_cu (cu)
10570 /* We should only be processing DIEs not already in process. */
10571 gdb_assert (!m_die->in_process);
10572 m_die->in_process = true;
10575 ~process_die_scope ()
10577 m_die->in_process = false;
10579 /* If we're done processing the DIE for the CU that owns the line
10580 header, we don't need the line header anymore. */
10581 if (m_cu->line_header_die_owner == m_die)
10583 delete m_cu->line_header;
10584 m_cu->line_header = NULL;
10585 m_cu->line_header_die_owner = NULL;
10594 /* Process a die and its children. */
10597 process_die (struct die_info *die, struct dwarf2_cu *cu)
10599 process_die_scope scope (die, cu);
10603 case DW_TAG_padding:
10605 case DW_TAG_compile_unit:
10606 case DW_TAG_partial_unit:
10607 read_file_scope (die, cu);
10609 case DW_TAG_type_unit:
10610 read_type_unit_scope (die, cu);
10612 case DW_TAG_subprogram:
10613 case DW_TAG_inlined_subroutine:
10614 read_func_scope (die, cu);
10616 case DW_TAG_lexical_block:
10617 case DW_TAG_try_block:
10618 case DW_TAG_catch_block:
10619 read_lexical_block_scope (die, cu);
10621 case DW_TAG_call_site:
10622 case DW_TAG_GNU_call_site:
10623 read_call_site_scope (die, cu);
10625 case DW_TAG_class_type:
10626 case DW_TAG_interface_type:
10627 case DW_TAG_structure_type:
10628 case DW_TAG_union_type:
10629 process_structure_scope (die, cu);
10631 case DW_TAG_enumeration_type:
10632 process_enumeration_scope (die, cu);
10635 /* These dies have a type, but processing them does not create
10636 a symbol or recurse to process the children. Therefore we can
10637 read them on-demand through read_type_die. */
10638 case DW_TAG_subroutine_type:
10639 case DW_TAG_set_type:
10640 case DW_TAG_array_type:
10641 case DW_TAG_pointer_type:
10642 case DW_TAG_ptr_to_member_type:
10643 case DW_TAG_reference_type:
10644 case DW_TAG_rvalue_reference_type:
10645 case DW_TAG_string_type:
10648 case DW_TAG_base_type:
10649 case DW_TAG_subrange_type:
10650 case DW_TAG_typedef:
10651 /* Add a typedef symbol for the type definition, if it has a
10653 new_symbol (die, read_type_die (die, cu), cu);
10655 case DW_TAG_common_block:
10656 read_common_block (die, cu);
10658 case DW_TAG_common_inclusion:
10660 case DW_TAG_namespace:
10661 cu->processing_has_namespace_info = 1;
10662 read_namespace (die, cu);
10664 case DW_TAG_module:
10665 cu->processing_has_namespace_info = 1;
10666 read_module (die, cu);
10668 case DW_TAG_imported_declaration:
10669 cu->processing_has_namespace_info = 1;
10670 if (read_namespace_alias (die, cu))
10672 /* The declaration is not a global namespace alias: fall through. */
10673 case DW_TAG_imported_module:
10674 cu->processing_has_namespace_info = 1;
10675 if (die->child != NULL && (die->tag == DW_TAG_imported_declaration
10676 || cu->language != language_fortran))
10677 complaint (&symfile_complaints, _("Tag '%s' has unexpected children"),
10678 dwarf_tag_name (die->tag));
10679 read_import_statement (die, cu);
10682 case DW_TAG_imported_unit:
10683 process_imported_unit_die (die, cu);
10686 case DW_TAG_variable:
10687 read_variable (die, cu);
10691 new_symbol (die, NULL, cu);
10696 /* DWARF name computation. */
10698 /* A helper function for dwarf2_compute_name which determines whether DIE
10699 needs to have the name of the scope prepended to the name listed in the
10703 die_needs_namespace (struct die_info *die, struct dwarf2_cu *cu)
10705 struct attribute *attr;
10709 case DW_TAG_namespace:
10710 case DW_TAG_typedef:
10711 case DW_TAG_class_type:
10712 case DW_TAG_interface_type:
10713 case DW_TAG_structure_type:
10714 case DW_TAG_union_type:
10715 case DW_TAG_enumeration_type:
10716 case DW_TAG_enumerator:
10717 case DW_TAG_subprogram:
10718 case DW_TAG_inlined_subroutine:
10719 case DW_TAG_member:
10720 case DW_TAG_imported_declaration:
10723 case DW_TAG_variable:
10724 case DW_TAG_constant:
10725 /* We only need to prefix "globally" visible variables. These include
10726 any variable marked with DW_AT_external or any variable that
10727 lives in a namespace. [Variables in anonymous namespaces
10728 require prefixing, but they are not DW_AT_external.] */
10730 if (dwarf2_attr (die, DW_AT_specification, cu))
10732 struct dwarf2_cu *spec_cu = cu;
10734 return die_needs_namespace (die_specification (die, &spec_cu),
10738 attr = dwarf2_attr (die, DW_AT_external, cu);
10739 if (attr == NULL && die->parent->tag != DW_TAG_namespace
10740 && die->parent->tag != DW_TAG_module)
10742 /* A variable in a lexical block of some kind does not need a
10743 namespace, even though in C++ such variables may be external
10744 and have a mangled name. */
10745 if (die->parent->tag == DW_TAG_lexical_block
10746 || die->parent->tag == DW_TAG_try_block
10747 || die->parent->tag == DW_TAG_catch_block
10748 || die->parent->tag == DW_TAG_subprogram)
10757 /* Return the DIE's linkage name attribute, either DW_AT_linkage_name
10758 or DW_AT_MIPS_linkage_name. Returns NULL if the attribute is not
10759 defined for the given DIE. */
10761 static struct attribute *
10762 dw2_linkage_name_attr (struct die_info *die, struct dwarf2_cu *cu)
10764 struct attribute *attr;
10766 attr = dwarf2_attr (die, DW_AT_linkage_name, cu);
10768 attr = dwarf2_attr (die, DW_AT_MIPS_linkage_name, cu);
10773 /* Return the DIE's linkage name as a string, either DW_AT_linkage_name
10774 or DW_AT_MIPS_linkage_name. Returns NULL if the attribute is not
10775 defined for the given DIE. */
10777 static const char *
10778 dw2_linkage_name (struct die_info *die, struct dwarf2_cu *cu)
10780 const char *linkage_name;
10782 linkage_name = dwarf2_string_attr (die, DW_AT_linkage_name, cu);
10783 if (linkage_name == NULL)
10784 linkage_name = dwarf2_string_attr (die, DW_AT_MIPS_linkage_name, cu);
10786 return linkage_name;
10789 /* Compute the fully qualified name of DIE in CU. If PHYSNAME is nonzero,
10790 compute the physname for the object, which include a method's:
10791 - formal parameters (C++),
10792 - receiver type (Go),
10794 The term "physname" is a bit confusing.
10795 For C++, for example, it is the demangled name.
10796 For Go, for example, it's the mangled name.
10798 For Ada, return the DIE's linkage name rather than the fully qualified
10799 name. PHYSNAME is ignored..
10801 The result is allocated on the objfile_obstack and canonicalized. */
10803 static const char *
10804 dwarf2_compute_name (const char *name,
10805 struct die_info *die, struct dwarf2_cu *cu,
10808 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
10811 name = dwarf2_name (die, cu);
10813 /* For Fortran GDB prefers DW_AT_*linkage_name for the physname if present
10814 but otherwise compute it by typename_concat inside GDB.
10815 FIXME: Actually this is not really true, or at least not always true.
10816 It's all very confusing. SYMBOL_SET_NAMES doesn't try to demangle
10817 Fortran names because there is no mangling standard. So new_symbol
10818 will set the demangled name to the result of dwarf2_full_name, and it is
10819 the demangled name that GDB uses if it exists. */
10820 if (cu->language == language_ada
10821 || (cu->language == language_fortran && physname))
10823 /* For Ada unit, we prefer the linkage name over the name, as
10824 the former contains the exported name, which the user expects
10825 to be able to reference. Ideally, we want the user to be able
10826 to reference this entity using either natural or linkage name,
10827 but we haven't started looking at this enhancement yet. */
10828 const char *linkage_name = dw2_linkage_name (die, cu);
10830 if (linkage_name != NULL)
10831 return linkage_name;
10834 /* These are the only languages we know how to qualify names in. */
10836 && (cu->language == language_cplus
10837 || cu->language == language_fortran || cu->language == language_d
10838 || cu->language == language_rust))
10840 if (die_needs_namespace (die, cu))
10842 const char *prefix;
10843 const char *canonical_name = NULL;
10847 prefix = determine_prefix (die, cu);
10848 if (*prefix != '\0')
10850 char *prefixed_name = typename_concat (NULL, prefix, name,
10853 buf.puts (prefixed_name);
10854 xfree (prefixed_name);
10859 /* Template parameters may be specified in the DIE's DW_AT_name, or
10860 as children with DW_TAG_template_type_param or
10861 DW_TAG_value_type_param. If the latter, add them to the name
10862 here. If the name already has template parameters, then
10863 skip this step; some versions of GCC emit both, and
10864 it is more efficient to use the pre-computed name.
10866 Something to keep in mind about this process: it is very
10867 unlikely, or in some cases downright impossible, to produce
10868 something that will match the mangled name of a function.
10869 If the definition of the function has the same debug info,
10870 we should be able to match up with it anyway. But fallbacks
10871 using the minimal symbol, for instance to find a method
10872 implemented in a stripped copy of libstdc++, will not work.
10873 If we do not have debug info for the definition, we will have to
10874 match them up some other way.
10876 When we do name matching there is a related problem with function
10877 templates; two instantiated function templates are allowed to
10878 differ only by their return types, which we do not add here. */
10880 if (cu->language == language_cplus && strchr (name, '<') == NULL)
10882 struct attribute *attr;
10883 struct die_info *child;
10886 die->building_fullname = 1;
10888 for (child = die->child; child != NULL; child = child->sibling)
10892 const gdb_byte *bytes;
10893 struct dwarf2_locexpr_baton *baton;
10896 if (child->tag != DW_TAG_template_type_param
10897 && child->tag != DW_TAG_template_value_param)
10908 attr = dwarf2_attr (child, DW_AT_type, cu);
10911 complaint (&symfile_complaints,
10912 _("template parameter missing DW_AT_type"));
10913 buf.puts ("UNKNOWN_TYPE");
10916 type = die_type (child, cu);
10918 if (child->tag == DW_TAG_template_type_param)
10920 c_print_type (type, "", &buf, -1, 0, &type_print_raw_options);
10924 attr = dwarf2_attr (child, DW_AT_const_value, cu);
10927 complaint (&symfile_complaints,
10928 _("template parameter missing "
10929 "DW_AT_const_value"));
10930 buf.puts ("UNKNOWN_VALUE");
10934 dwarf2_const_value_attr (attr, type, name,
10935 &cu->comp_unit_obstack, cu,
10936 &value, &bytes, &baton);
10938 if (TYPE_NOSIGN (type))
10939 /* GDB prints characters as NUMBER 'CHAR'. If that's
10940 changed, this can use value_print instead. */
10941 c_printchar (value, type, &buf);
10944 struct value_print_options opts;
10947 v = dwarf2_evaluate_loc_desc (type, NULL,
10951 else if (bytes != NULL)
10953 v = allocate_value (type);
10954 memcpy (value_contents_writeable (v), bytes,
10955 TYPE_LENGTH (type));
10958 v = value_from_longest (type, value);
10960 /* Specify decimal so that we do not depend on
10962 get_formatted_print_options (&opts, 'd');
10964 value_print (v, &buf, &opts);
10969 die->building_fullname = 0;
10973 /* Close the argument list, with a space if necessary
10974 (nested templates). */
10975 if (!buf.empty () && buf.string ().back () == '>')
10982 /* For C++ methods, append formal parameter type
10983 information, if PHYSNAME. */
10985 if (physname && die->tag == DW_TAG_subprogram
10986 && cu->language == language_cplus)
10988 struct type *type = read_type_die (die, cu);
10990 c_type_print_args (type, &buf, 1, cu->language,
10991 &type_print_raw_options);
10993 if (cu->language == language_cplus)
10995 /* Assume that an artificial first parameter is
10996 "this", but do not crash if it is not. RealView
10997 marks unnamed (and thus unused) parameters as
10998 artificial; there is no way to differentiate
11000 if (TYPE_NFIELDS (type) > 0
11001 && TYPE_FIELD_ARTIFICIAL (type, 0)
11002 && TYPE_CODE (TYPE_FIELD_TYPE (type, 0)) == TYPE_CODE_PTR
11003 && TYPE_CONST (TYPE_TARGET_TYPE (TYPE_FIELD_TYPE (type,
11005 buf.puts (" const");
11009 const std::string &intermediate_name = buf.string ();
11011 if (cu->language == language_cplus)
11013 = dwarf2_canonicalize_name (intermediate_name.c_str (), cu,
11014 &objfile->per_bfd->storage_obstack);
11016 /* If we only computed INTERMEDIATE_NAME, or if
11017 INTERMEDIATE_NAME is already canonical, then we need to
11018 copy it to the appropriate obstack. */
11019 if (canonical_name == NULL || canonical_name == intermediate_name.c_str ())
11020 name = ((const char *)
11021 obstack_copy0 (&objfile->per_bfd->storage_obstack,
11022 intermediate_name.c_str (),
11023 intermediate_name.length ()));
11025 name = canonical_name;
11032 /* Return the fully qualified name of DIE, based on its DW_AT_name.
11033 If scope qualifiers are appropriate they will be added. The result
11034 will be allocated on the storage_obstack, or NULL if the DIE does
11035 not have a name. NAME may either be from a previous call to
11036 dwarf2_name or NULL.
11038 The output string will be canonicalized (if C++). */
11040 static const char *
11041 dwarf2_full_name (const char *name, struct die_info *die, struct dwarf2_cu *cu)
11043 return dwarf2_compute_name (name, die, cu, 0);
11046 /* Construct a physname for the given DIE in CU. NAME may either be
11047 from a previous call to dwarf2_name or NULL. The result will be
11048 allocated on the objfile_objstack or NULL if the DIE does not have a
11051 The output string will be canonicalized (if C++). */
11053 static const char *
11054 dwarf2_physname (const char *name, struct die_info *die, struct dwarf2_cu *cu)
11056 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
11057 const char *retval, *mangled = NULL, *canon = NULL;
11060 /* In this case dwarf2_compute_name is just a shortcut not building anything
11062 if (!die_needs_namespace (die, cu))
11063 return dwarf2_compute_name (name, die, cu, 1);
11065 mangled = dw2_linkage_name (die, cu);
11067 /* rustc emits invalid values for DW_AT_linkage_name. Ignore these.
11068 See https://github.com/rust-lang/rust/issues/32925. */
11069 if (cu->language == language_rust && mangled != NULL
11070 && strchr (mangled, '{') != NULL)
11073 /* DW_AT_linkage_name is missing in some cases - depend on what GDB
11075 gdb::unique_xmalloc_ptr<char> demangled;
11076 if (mangled != NULL)
11079 if (language_def (cu->language)->la_store_sym_names_in_linkage_form_p)
11081 /* Do nothing (do not demangle the symbol name). */
11083 else if (cu->language == language_go)
11085 /* This is a lie, but we already lie to the caller new_symbol.
11086 new_symbol assumes we return the mangled name.
11087 This just undoes that lie until things are cleaned up. */
11091 /* Use DMGL_RET_DROP for C++ template functions to suppress
11092 their return type. It is easier for GDB users to search
11093 for such functions as `name(params)' than `long name(params)'.
11094 In such case the minimal symbol names do not match the full
11095 symbol names but for template functions there is never a need
11096 to look up their definition from their declaration so
11097 the only disadvantage remains the minimal symbol variant
11098 `long name(params)' does not have the proper inferior type. */
11099 demangled.reset (gdb_demangle (mangled,
11100 (DMGL_PARAMS | DMGL_ANSI
11101 | DMGL_RET_DROP)));
11104 canon = demangled.get ();
11112 if (canon == NULL || check_physname)
11114 const char *physname = dwarf2_compute_name (name, die, cu, 1);
11116 if (canon != NULL && strcmp (physname, canon) != 0)
11118 /* It may not mean a bug in GDB. The compiler could also
11119 compute DW_AT_linkage_name incorrectly. But in such case
11120 GDB would need to be bug-to-bug compatible. */
11122 complaint (&symfile_complaints,
11123 _("Computed physname <%s> does not match demangled <%s> "
11124 "(from linkage <%s>) - DIE at %s [in module %s]"),
11125 physname, canon, mangled, sect_offset_str (die->sect_off),
11126 objfile_name (objfile));
11128 /* Prefer DW_AT_linkage_name (in the CANON form) - when it
11129 is available here - over computed PHYSNAME. It is safer
11130 against both buggy GDB and buggy compilers. */
11144 retval = ((const char *)
11145 obstack_copy0 (&objfile->per_bfd->storage_obstack,
11146 retval, strlen (retval)));
11151 /* Inspect DIE in CU for a namespace alias. If one exists, record
11152 a new symbol for it.
11154 Returns 1 if a namespace alias was recorded, 0 otherwise. */
11157 read_namespace_alias (struct die_info *die, struct dwarf2_cu *cu)
11159 struct attribute *attr;
11161 /* If the die does not have a name, this is not a namespace
11163 attr = dwarf2_attr (die, DW_AT_name, cu);
11167 struct die_info *d = die;
11168 struct dwarf2_cu *imported_cu = cu;
11170 /* If the compiler has nested DW_AT_imported_declaration DIEs,
11171 keep inspecting DIEs until we hit the underlying import. */
11172 #define MAX_NESTED_IMPORTED_DECLARATIONS 100
11173 for (num = 0; num < MAX_NESTED_IMPORTED_DECLARATIONS; ++num)
11175 attr = dwarf2_attr (d, DW_AT_import, cu);
11179 d = follow_die_ref (d, attr, &imported_cu);
11180 if (d->tag != DW_TAG_imported_declaration)
11184 if (num == MAX_NESTED_IMPORTED_DECLARATIONS)
11186 complaint (&symfile_complaints,
11187 _("DIE at %s has too many recursively imported "
11188 "declarations"), sect_offset_str (d->sect_off));
11195 sect_offset sect_off = dwarf2_get_ref_die_offset (attr);
11197 type = get_die_type_at_offset (sect_off, cu->per_cu);
11198 if (type != NULL && TYPE_CODE (type) == TYPE_CODE_NAMESPACE)
11200 /* This declaration is a global namespace alias. Add
11201 a symbol for it whose type is the aliased namespace. */
11202 new_symbol (die, type, cu);
11211 /* Return the using directives repository (global or local?) to use in the
11212 current context for LANGUAGE.
11214 For Ada, imported declarations can materialize renamings, which *may* be
11215 global. However it is impossible (for now?) in DWARF to distinguish
11216 "external" imported declarations and "static" ones. As all imported
11217 declarations seem to be static in all other languages, make them all CU-wide
11218 global only in Ada. */
11220 static struct using_direct **
11221 using_directives (enum language language)
11223 if (language == language_ada && context_stack_depth == 0)
11224 return &global_using_directives;
11226 return &local_using_directives;
11229 /* Read the import statement specified by the given die and record it. */
11232 read_import_statement (struct die_info *die, struct dwarf2_cu *cu)
11234 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
11235 struct attribute *import_attr;
11236 struct die_info *imported_die, *child_die;
11237 struct dwarf2_cu *imported_cu;
11238 const char *imported_name;
11239 const char *imported_name_prefix;
11240 const char *canonical_name;
11241 const char *import_alias;
11242 const char *imported_declaration = NULL;
11243 const char *import_prefix;
11244 std::vector<const char *> excludes;
11246 import_attr = dwarf2_attr (die, DW_AT_import, cu);
11247 if (import_attr == NULL)
11249 complaint (&symfile_complaints, _("Tag '%s' has no DW_AT_import"),
11250 dwarf_tag_name (die->tag));
11255 imported_die = follow_die_ref_or_sig (die, import_attr, &imported_cu);
11256 imported_name = dwarf2_name (imported_die, imported_cu);
11257 if (imported_name == NULL)
11259 /* GCC bug: https://bugzilla.redhat.com/show_bug.cgi?id=506524
11261 The import in the following code:
11275 <2><51>: Abbrev Number: 3 (DW_TAG_imported_declaration)
11276 <52> DW_AT_decl_file : 1
11277 <53> DW_AT_decl_line : 6
11278 <54> DW_AT_import : <0x75>
11279 <2><58>: Abbrev Number: 4 (DW_TAG_typedef)
11280 <59> DW_AT_name : B
11281 <5b> DW_AT_decl_file : 1
11282 <5c> DW_AT_decl_line : 2
11283 <5d> DW_AT_type : <0x6e>
11285 <1><75>: Abbrev Number: 7 (DW_TAG_base_type)
11286 <76> DW_AT_byte_size : 4
11287 <77> DW_AT_encoding : 5 (signed)
11289 imports the wrong die ( 0x75 instead of 0x58 ).
11290 This case will be ignored until the gcc bug is fixed. */
11294 /* Figure out the local name after import. */
11295 import_alias = dwarf2_name (die, cu);
11297 /* Figure out where the statement is being imported to. */
11298 import_prefix = determine_prefix (die, cu);
11300 /* Figure out what the scope of the imported die is and prepend it
11301 to the name of the imported die. */
11302 imported_name_prefix = determine_prefix (imported_die, imported_cu);
11304 if (imported_die->tag != DW_TAG_namespace
11305 && imported_die->tag != DW_TAG_module)
11307 imported_declaration = imported_name;
11308 canonical_name = imported_name_prefix;
11310 else if (strlen (imported_name_prefix) > 0)
11311 canonical_name = obconcat (&objfile->objfile_obstack,
11312 imported_name_prefix,
11313 (cu->language == language_d ? "." : "::"),
11314 imported_name, (char *) NULL);
11316 canonical_name = imported_name;
11318 if (die->tag == DW_TAG_imported_module && cu->language == language_fortran)
11319 for (child_die = die->child; child_die && child_die->tag;
11320 child_die = sibling_die (child_die))
11322 /* DWARF-4: A Fortran use statement with a “rename list” may be
11323 represented by an imported module entry with an import attribute
11324 referring to the module and owned entries corresponding to those
11325 entities that are renamed as part of being imported. */
11327 if (child_die->tag != DW_TAG_imported_declaration)
11329 complaint (&symfile_complaints,
11330 _("child DW_TAG_imported_declaration expected "
11331 "- DIE at %s [in module %s]"),
11332 sect_offset_str (child_die->sect_off),
11333 objfile_name (objfile));
11337 import_attr = dwarf2_attr (child_die, DW_AT_import, cu);
11338 if (import_attr == NULL)
11340 complaint (&symfile_complaints, _("Tag '%s' has no DW_AT_import"),
11341 dwarf_tag_name (child_die->tag));
11346 imported_die = follow_die_ref_or_sig (child_die, import_attr,
11348 imported_name = dwarf2_name (imported_die, imported_cu);
11349 if (imported_name == NULL)
11351 complaint (&symfile_complaints,
11352 _("child DW_TAG_imported_declaration has unknown "
11353 "imported name - DIE at %s [in module %s]"),
11354 sect_offset_str (child_die->sect_off),
11355 objfile_name (objfile));
11359 excludes.push_back (imported_name);
11361 process_die (child_die, cu);
11364 add_using_directive (using_directives (cu->language),
11368 imported_declaration,
11371 &objfile->objfile_obstack);
11374 /* ICC<14 does not output the required DW_AT_declaration on incomplete
11375 types, but gives them a size of zero. Starting with version 14,
11376 ICC is compatible with GCC. */
11379 producer_is_icc_lt_14 (struct dwarf2_cu *cu)
11381 if (!cu->checked_producer)
11382 check_producer (cu);
11384 return cu->producer_is_icc_lt_14;
11387 /* Check for possibly missing DW_AT_comp_dir with relative .debug_line
11388 directory paths. GCC SVN r127613 (new option -fdebug-prefix-map) fixed
11389 this, it was first present in GCC release 4.3.0. */
11392 producer_is_gcc_lt_4_3 (struct dwarf2_cu *cu)
11394 if (!cu->checked_producer)
11395 check_producer (cu);
11397 return cu->producer_is_gcc_lt_4_3;
11400 static file_and_directory
11401 find_file_and_directory (struct die_info *die, struct dwarf2_cu *cu)
11403 file_and_directory res;
11405 /* Find the filename. Do not use dwarf2_name here, since the filename
11406 is not a source language identifier. */
11407 res.name = dwarf2_string_attr (die, DW_AT_name, cu);
11408 res.comp_dir = dwarf2_string_attr (die, DW_AT_comp_dir, cu);
11410 if (res.comp_dir == NULL
11411 && producer_is_gcc_lt_4_3 (cu) && res.name != NULL
11412 && IS_ABSOLUTE_PATH (res.name))
11414 res.comp_dir_storage = ldirname (res.name);
11415 if (!res.comp_dir_storage.empty ())
11416 res.comp_dir = res.comp_dir_storage.c_str ();
11418 if (res.comp_dir != NULL)
11420 /* Irix 6.2 native cc prepends <machine>.: to the compilation
11421 directory, get rid of it. */
11422 const char *cp = strchr (res.comp_dir, ':');
11424 if (cp && cp != res.comp_dir && cp[-1] == '.' && cp[1] == '/')
11425 res.comp_dir = cp + 1;
11428 if (res.name == NULL)
11429 res.name = "<unknown>";
11434 /* Handle DW_AT_stmt_list for a compilation unit.
11435 DIE is the DW_TAG_compile_unit die for CU.
11436 COMP_DIR is the compilation directory. LOWPC is passed to
11437 dwarf_decode_lines. See dwarf_decode_lines comments about it. */
11440 handle_DW_AT_stmt_list (struct die_info *die, struct dwarf2_cu *cu,
11441 const char *comp_dir, CORE_ADDR lowpc) /* ARI: editCase function */
11443 struct dwarf2_per_objfile *dwarf2_per_objfile
11444 = cu->per_cu->dwarf2_per_objfile;
11445 struct objfile *objfile = dwarf2_per_objfile->objfile;
11446 struct attribute *attr;
11447 struct line_header line_header_local;
11448 hashval_t line_header_local_hash;
11450 int decode_mapping;
11452 gdb_assert (! cu->per_cu->is_debug_types);
11454 attr = dwarf2_attr (die, DW_AT_stmt_list, cu);
11458 sect_offset line_offset = (sect_offset) DW_UNSND (attr);
11460 /* The line header hash table is only created if needed (it exists to
11461 prevent redundant reading of the line table for partial_units).
11462 If we're given a partial_unit, we'll need it. If we're given a
11463 compile_unit, then use the line header hash table if it's already
11464 created, but don't create one just yet. */
11466 if (dwarf2_per_objfile->line_header_hash == NULL
11467 && die->tag == DW_TAG_partial_unit)
11469 dwarf2_per_objfile->line_header_hash
11470 = htab_create_alloc_ex (127, line_header_hash_voidp,
11471 line_header_eq_voidp,
11472 free_line_header_voidp,
11473 &objfile->objfile_obstack,
11474 hashtab_obstack_allocate,
11475 dummy_obstack_deallocate);
11478 line_header_local.sect_off = line_offset;
11479 line_header_local.offset_in_dwz = cu->per_cu->is_dwz;
11480 line_header_local_hash = line_header_hash (&line_header_local);
11481 if (dwarf2_per_objfile->line_header_hash != NULL)
11483 slot = htab_find_slot_with_hash (dwarf2_per_objfile->line_header_hash,
11484 &line_header_local,
11485 line_header_local_hash, NO_INSERT);
11487 /* For DW_TAG_compile_unit we need info like symtab::linetable which
11488 is not present in *SLOT (since if there is something in *SLOT then
11489 it will be for a partial_unit). */
11490 if (die->tag == DW_TAG_partial_unit && slot != NULL)
11492 gdb_assert (*slot != NULL);
11493 cu->line_header = (struct line_header *) *slot;
11498 /* dwarf_decode_line_header does not yet provide sufficient information.
11499 We always have to call also dwarf_decode_lines for it. */
11500 line_header_up lh = dwarf_decode_line_header (line_offset, cu);
11504 cu->line_header = lh.release ();
11505 cu->line_header_die_owner = die;
11507 if (dwarf2_per_objfile->line_header_hash == NULL)
11511 slot = htab_find_slot_with_hash (dwarf2_per_objfile->line_header_hash,
11512 &line_header_local,
11513 line_header_local_hash, INSERT);
11514 gdb_assert (slot != NULL);
11516 if (slot != NULL && *slot == NULL)
11518 /* This newly decoded line number information unit will be owned
11519 by line_header_hash hash table. */
11520 *slot = cu->line_header;
11521 cu->line_header_die_owner = NULL;
11525 /* We cannot free any current entry in (*slot) as that struct line_header
11526 may be already used by multiple CUs. Create only temporary decoded
11527 line_header for this CU - it may happen at most once for each line
11528 number information unit. And if we're not using line_header_hash
11529 then this is what we want as well. */
11530 gdb_assert (die->tag != DW_TAG_partial_unit);
11532 decode_mapping = (die->tag != DW_TAG_partial_unit);
11533 dwarf_decode_lines (cu->line_header, comp_dir, cu, NULL, lowpc,
11538 /* Process DW_TAG_compile_unit or DW_TAG_partial_unit. */
11541 read_file_scope (struct die_info *die, struct dwarf2_cu *cu)
11543 struct dwarf2_per_objfile *dwarf2_per_objfile
11544 = cu->per_cu->dwarf2_per_objfile;
11545 struct objfile *objfile = dwarf2_per_objfile->objfile;
11546 struct gdbarch *gdbarch = get_objfile_arch (objfile);
11547 CORE_ADDR lowpc = ((CORE_ADDR) -1);
11548 CORE_ADDR highpc = ((CORE_ADDR) 0);
11549 struct attribute *attr;
11550 struct die_info *child_die;
11551 CORE_ADDR baseaddr;
11553 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
11555 get_scope_pc_bounds (die, &lowpc, &highpc, cu);
11557 /* If we didn't find a lowpc, set it to highpc to avoid complaints
11558 from finish_block. */
11559 if (lowpc == ((CORE_ADDR) -1))
11561 lowpc = gdbarch_adjust_dwarf2_addr (gdbarch, lowpc + baseaddr);
11563 file_and_directory fnd = find_file_and_directory (die, cu);
11565 prepare_one_comp_unit (cu, die, cu->language);
11567 /* The XLCL doesn't generate DW_LANG_OpenCL because this attribute is not
11568 standardised yet. As a workaround for the language detection we fall
11569 back to the DW_AT_producer string. */
11570 if (cu->producer && strstr (cu->producer, "IBM XL C for OpenCL") != NULL)
11571 cu->language = language_opencl;
11573 /* Similar hack for Go. */
11574 if (cu->producer && strstr (cu->producer, "GNU Go ") != NULL)
11575 set_cu_language (DW_LANG_Go, cu);
11577 dwarf2_start_symtab (cu, fnd.name, fnd.comp_dir, lowpc);
11579 /* Decode line number information if present. We do this before
11580 processing child DIEs, so that the line header table is available
11581 for DW_AT_decl_file. */
11582 handle_DW_AT_stmt_list (die, cu, fnd.comp_dir, lowpc);
11584 /* Process all dies in compilation unit. */
11585 if (die->child != NULL)
11587 child_die = die->child;
11588 while (child_die && child_die->tag)
11590 process_die (child_die, cu);
11591 child_die = sibling_die (child_die);
11595 /* Decode macro information, if present. Dwarf 2 macro information
11596 refers to information in the line number info statement program
11597 header, so we can only read it if we've read the header
11599 attr = dwarf2_attr (die, DW_AT_macros, cu);
11601 attr = dwarf2_attr (die, DW_AT_GNU_macros, cu);
11602 if (attr && cu->line_header)
11604 if (dwarf2_attr (die, DW_AT_macro_info, cu))
11605 complaint (&symfile_complaints,
11606 _("CU refers to both DW_AT_macros and DW_AT_macro_info"));
11608 dwarf_decode_macros (cu, DW_UNSND (attr), 1);
11612 attr = dwarf2_attr (die, DW_AT_macro_info, cu);
11613 if (attr && cu->line_header)
11615 unsigned int macro_offset = DW_UNSND (attr);
11617 dwarf_decode_macros (cu, macro_offset, 0);
11622 /* TU version of handle_DW_AT_stmt_list for read_type_unit_scope.
11623 Create the set of symtabs used by this TU, or if this TU is sharing
11624 symtabs with another TU and the symtabs have already been created
11625 then restore those symtabs in the line header.
11626 We don't need the pc/line-number mapping for type units. */
11629 setup_type_unit_groups (struct die_info *die, struct dwarf2_cu *cu)
11631 struct dwarf2_per_cu_data *per_cu = cu->per_cu;
11632 struct type_unit_group *tu_group;
11634 struct attribute *attr;
11636 struct signatured_type *sig_type;
11638 gdb_assert (per_cu->is_debug_types);
11639 sig_type = (struct signatured_type *) per_cu;
11641 attr = dwarf2_attr (die, DW_AT_stmt_list, cu);
11643 /* If we're using .gdb_index (includes -readnow) then
11644 per_cu->type_unit_group may not have been set up yet. */
11645 if (sig_type->type_unit_group == NULL)
11646 sig_type->type_unit_group = get_type_unit_group (cu, attr);
11647 tu_group = sig_type->type_unit_group;
11649 /* If we've already processed this stmt_list there's no real need to
11650 do it again, we could fake it and just recreate the part we need
11651 (file name,index -> symtab mapping). If data shows this optimization
11652 is useful we can do it then. */
11653 first_time = tu_group->compunit_symtab == NULL;
11655 /* We have to handle the case of both a missing DW_AT_stmt_list or bad
11660 sect_offset line_offset = (sect_offset) DW_UNSND (attr);
11661 lh = dwarf_decode_line_header (line_offset, cu);
11666 dwarf2_start_symtab (cu, "", NULL, 0);
11669 gdb_assert (tu_group->symtabs == NULL);
11670 restart_symtab (tu_group->compunit_symtab, "", 0);
11675 cu->line_header = lh.release ();
11676 cu->line_header_die_owner = die;
11680 struct compunit_symtab *cust = dwarf2_start_symtab (cu, "", NULL, 0);
11682 /* Note: We don't assign tu_group->compunit_symtab yet because we're
11683 still initializing it, and our caller (a few levels up)
11684 process_full_type_unit still needs to know if this is the first
11687 tu_group->num_symtabs = cu->line_header->file_names.size ();
11688 tu_group->symtabs = XNEWVEC (struct symtab *,
11689 cu->line_header->file_names.size ());
11691 for (i = 0; i < cu->line_header->file_names.size (); ++i)
11693 file_entry &fe = cu->line_header->file_names[i];
11695 dwarf2_start_subfile (fe.name, fe.include_dir (cu->line_header));
11697 if (current_subfile->symtab == NULL)
11699 /* NOTE: start_subfile will recognize when it's been
11700 passed a file it has already seen. So we can't
11701 assume there's a simple mapping from
11702 cu->line_header->file_names to subfiles, plus
11703 cu->line_header->file_names may contain dups. */
11704 current_subfile->symtab
11705 = allocate_symtab (cust, current_subfile->name);
11708 fe.symtab = current_subfile->symtab;
11709 tu_group->symtabs[i] = fe.symtab;
11714 restart_symtab (tu_group->compunit_symtab, "", 0);
11716 for (i = 0; i < cu->line_header->file_names.size (); ++i)
11718 file_entry &fe = cu->line_header->file_names[i];
11720 fe.symtab = tu_group->symtabs[i];
11724 /* The main symtab is allocated last. Type units don't have DW_AT_name
11725 so they don't have a "real" (so to speak) symtab anyway.
11726 There is later code that will assign the main symtab to all symbols
11727 that don't have one. We need to handle the case of a symbol with a
11728 missing symtab (DW_AT_decl_file) anyway. */
11731 /* Process DW_TAG_type_unit.
11732 For TUs we want to skip the first top level sibling if it's not the
11733 actual type being defined by this TU. In this case the first top
11734 level sibling is there to provide context only. */
11737 read_type_unit_scope (struct die_info *die, struct dwarf2_cu *cu)
11739 struct die_info *child_die;
11741 prepare_one_comp_unit (cu, die, language_minimal);
11743 /* Initialize (or reinitialize) the machinery for building symtabs.
11744 We do this before processing child DIEs, so that the line header table
11745 is available for DW_AT_decl_file. */
11746 setup_type_unit_groups (die, cu);
11748 if (die->child != NULL)
11750 child_die = die->child;
11751 while (child_die && child_die->tag)
11753 process_die (child_die, cu);
11754 child_die = sibling_die (child_die);
11761 http://gcc.gnu.org/wiki/DebugFission
11762 http://gcc.gnu.org/wiki/DebugFissionDWP
11764 To simplify handling of both DWO files ("object" files with the DWARF info)
11765 and DWP files (a file with the DWOs packaged up into one file), we treat
11766 DWP files as having a collection of virtual DWO files. */
11769 hash_dwo_file (const void *item)
11771 const struct dwo_file *dwo_file = (const struct dwo_file *) item;
11774 hash = htab_hash_string (dwo_file->dwo_name);
11775 if (dwo_file->comp_dir != NULL)
11776 hash += htab_hash_string (dwo_file->comp_dir);
11781 eq_dwo_file (const void *item_lhs, const void *item_rhs)
11783 const struct dwo_file *lhs = (const struct dwo_file *) item_lhs;
11784 const struct dwo_file *rhs = (const struct dwo_file *) item_rhs;
11786 if (strcmp (lhs->dwo_name, rhs->dwo_name) != 0)
11788 if (lhs->comp_dir == NULL || rhs->comp_dir == NULL)
11789 return lhs->comp_dir == rhs->comp_dir;
11790 return strcmp (lhs->comp_dir, rhs->comp_dir) == 0;
11793 /* Allocate a hash table for DWO files. */
11796 allocate_dwo_file_hash_table (struct objfile *objfile)
11798 return htab_create_alloc_ex (41,
11802 &objfile->objfile_obstack,
11803 hashtab_obstack_allocate,
11804 dummy_obstack_deallocate);
11807 /* Lookup DWO file DWO_NAME. */
11810 lookup_dwo_file_slot (struct dwarf2_per_objfile *dwarf2_per_objfile,
11811 const char *dwo_name,
11812 const char *comp_dir)
11814 struct dwo_file find_entry;
11817 if (dwarf2_per_objfile->dwo_files == NULL)
11818 dwarf2_per_objfile->dwo_files
11819 = allocate_dwo_file_hash_table (dwarf2_per_objfile->objfile);
11821 memset (&find_entry, 0, sizeof (find_entry));
11822 find_entry.dwo_name = dwo_name;
11823 find_entry.comp_dir = comp_dir;
11824 slot = htab_find_slot (dwarf2_per_objfile->dwo_files, &find_entry, INSERT);
11830 hash_dwo_unit (const void *item)
11832 const struct dwo_unit *dwo_unit = (const struct dwo_unit *) item;
11834 /* This drops the top 32 bits of the id, but is ok for a hash. */
11835 return dwo_unit->signature;
11839 eq_dwo_unit (const void *item_lhs, const void *item_rhs)
11841 const struct dwo_unit *lhs = (const struct dwo_unit *) item_lhs;
11842 const struct dwo_unit *rhs = (const struct dwo_unit *) item_rhs;
11844 /* The signature is assumed to be unique within the DWO file.
11845 So while object file CU dwo_id's always have the value zero,
11846 that's OK, assuming each object file DWO file has only one CU,
11847 and that's the rule for now. */
11848 return lhs->signature == rhs->signature;
11851 /* Allocate a hash table for DWO CUs,TUs.
11852 There is one of these tables for each of CUs,TUs for each DWO file. */
11855 allocate_dwo_unit_table (struct objfile *objfile)
11857 /* Start out with a pretty small number.
11858 Generally DWO files contain only one CU and maybe some TUs. */
11859 return htab_create_alloc_ex (3,
11863 &objfile->objfile_obstack,
11864 hashtab_obstack_allocate,
11865 dummy_obstack_deallocate);
11868 /* Structure used to pass data to create_dwo_debug_info_hash_table_reader. */
11870 struct create_dwo_cu_data
11872 struct dwo_file *dwo_file;
11873 struct dwo_unit dwo_unit;
11876 /* die_reader_func for create_dwo_cu. */
11879 create_dwo_cu_reader (const struct die_reader_specs *reader,
11880 const gdb_byte *info_ptr,
11881 struct die_info *comp_unit_die,
11885 struct dwarf2_cu *cu = reader->cu;
11886 sect_offset sect_off = cu->per_cu->sect_off;
11887 struct dwarf2_section_info *section = cu->per_cu->section;
11888 struct create_dwo_cu_data *data = (struct create_dwo_cu_data *) datap;
11889 struct dwo_file *dwo_file = data->dwo_file;
11890 struct dwo_unit *dwo_unit = &data->dwo_unit;
11891 struct attribute *attr;
11893 attr = dwarf2_attr (comp_unit_die, DW_AT_GNU_dwo_id, cu);
11896 complaint (&symfile_complaints,
11897 _("Dwarf Error: debug entry at offset %s is missing"
11898 " its dwo_id [in module %s]"),
11899 sect_offset_str (sect_off), dwo_file->dwo_name);
11903 dwo_unit->dwo_file = dwo_file;
11904 dwo_unit->signature = DW_UNSND (attr);
11905 dwo_unit->section = section;
11906 dwo_unit->sect_off = sect_off;
11907 dwo_unit->length = cu->per_cu->length;
11909 if (dwarf_read_debug)
11910 fprintf_unfiltered (gdb_stdlog, " offset %s, dwo_id %s\n",
11911 sect_offset_str (sect_off),
11912 hex_string (dwo_unit->signature));
11915 /* Create the dwo_units for the CUs in a DWO_FILE.
11916 Note: This function processes DWO files only, not DWP files. */
11919 create_cus_hash_table (struct dwarf2_per_objfile *dwarf2_per_objfile,
11920 struct dwo_file &dwo_file, dwarf2_section_info §ion,
11923 struct objfile *objfile = dwarf2_per_objfile->objfile;
11924 const gdb_byte *info_ptr, *end_ptr;
11926 dwarf2_read_section (objfile, §ion);
11927 info_ptr = section.buffer;
11929 if (info_ptr == NULL)
11932 if (dwarf_read_debug)
11934 fprintf_unfiltered (gdb_stdlog, "Reading %s for %s:\n",
11935 get_section_name (§ion),
11936 get_section_file_name (§ion));
11939 end_ptr = info_ptr + section.size;
11940 while (info_ptr < end_ptr)
11942 struct dwarf2_per_cu_data per_cu;
11943 struct create_dwo_cu_data create_dwo_cu_data;
11944 struct dwo_unit *dwo_unit;
11946 sect_offset sect_off = (sect_offset) (info_ptr - section.buffer);
11948 memset (&create_dwo_cu_data.dwo_unit, 0,
11949 sizeof (create_dwo_cu_data.dwo_unit));
11950 memset (&per_cu, 0, sizeof (per_cu));
11951 per_cu.dwarf2_per_objfile = dwarf2_per_objfile;
11952 per_cu.is_debug_types = 0;
11953 per_cu.sect_off = sect_offset (info_ptr - section.buffer);
11954 per_cu.section = §ion;
11955 create_dwo_cu_data.dwo_file = &dwo_file;
11957 init_cutu_and_read_dies_no_follow (
11958 &per_cu, &dwo_file, create_dwo_cu_reader, &create_dwo_cu_data);
11959 info_ptr += per_cu.length;
11961 // If the unit could not be parsed, skip it.
11962 if (create_dwo_cu_data.dwo_unit.dwo_file == NULL)
11965 if (cus_htab == NULL)
11966 cus_htab = allocate_dwo_unit_table (objfile);
11968 dwo_unit = OBSTACK_ZALLOC (&objfile->objfile_obstack, struct dwo_unit);
11969 *dwo_unit = create_dwo_cu_data.dwo_unit;
11970 slot = htab_find_slot (cus_htab, dwo_unit, INSERT);
11971 gdb_assert (slot != NULL);
11974 const struct dwo_unit *dup_cu = (const struct dwo_unit *)*slot;
11975 sect_offset dup_sect_off = dup_cu->sect_off;
11977 complaint (&symfile_complaints,
11978 _("debug cu entry at offset %s is duplicate to"
11979 " the entry at offset %s, signature %s"),
11980 sect_offset_str (sect_off), sect_offset_str (dup_sect_off),
11981 hex_string (dwo_unit->signature));
11983 *slot = (void *)dwo_unit;
11987 /* DWP file .debug_{cu,tu}_index section format:
11988 [ref: http://gcc.gnu.org/wiki/DebugFissionDWP]
11992 Both index sections have the same format, and serve to map a 64-bit
11993 signature to a set of section numbers. Each section begins with a header,
11994 followed by a hash table of 64-bit signatures, a parallel table of 32-bit
11995 indexes, and a pool of 32-bit section numbers. The index sections will be
11996 aligned at 8-byte boundaries in the file.
11998 The index section header consists of:
12000 V, 32 bit version number
12002 N, 32 bit number of compilation units or type units in the index
12003 M, 32 bit number of slots in the hash table
12005 Numbers are recorded using the byte order of the application binary.
12007 The hash table begins at offset 16 in the section, and consists of an array
12008 of M 64-bit slots. Each slot contains a 64-bit signature (using the byte
12009 order of the application binary). Unused slots in the hash table are 0.
12010 (We rely on the extreme unlikeliness of a signature being exactly 0.)
12012 The parallel table begins immediately after the hash table
12013 (at offset 16 + 8 * M from the beginning of the section), and consists of an
12014 array of 32-bit indexes (using the byte order of the application binary),
12015 corresponding 1-1 with slots in the hash table. Each entry in the parallel
12016 table contains a 32-bit index into the pool of section numbers. For unused
12017 hash table slots, the corresponding entry in the parallel table will be 0.
12019 The pool of section numbers begins immediately following the hash table
12020 (at offset 16 + 12 * M from the beginning of the section). The pool of
12021 section numbers consists of an array of 32-bit words (using the byte order
12022 of the application binary). Each item in the array is indexed starting
12023 from 0. The hash table entry provides the index of the first section
12024 number in the set. Additional section numbers in the set follow, and the
12025 set is terminated by a 0 entry (section number 0 is not used in ELF).
12027 In each set of section numbers, the .debug_info.dwo or .debug_types.dwo
12028 section must be the first entry in the set, and the .debug_abbrev.dwo must
12029 be the second entry. Other members of the set may follow in any order.
12035 DWP Version 2 combines all the .debug_info, etc. sections into one,
12036 and the entries in the index tables are now offsets into these sections.
12037 CU offsets begin at 0. TU offsets begin at the size of the .debug_info
12040 Index Section Contents:
12042 Hash Table of Signatures dwp_hash_table.hash_table
12043 Parallel Table of Indices dwp_hash_table.unit_table
12044 Table of Section Offsets dwp_hash_table.v2.{section_ids,offsets}
12045 Table of Section Sizes dwp_hash_table.v2.sizes
12047 The index section header consists of:
12049 V, 32 bit version number
12050 L, 32 bit number of columns in the table of section offsets
12051 N, 32 bit number of compilation units or type units in the index
12052 M, 32 bit number of slots in the hash table
12054 Numbers are recorded using the byte order of the application binary.
12056 The hash table has the same format as version 1.
12057 The parallel table of indices has the same format as version 1,
12058 except that the entries are origin-1 indices into the table of sections
12059 offsets and the table of section sizes.
12061 The table of offsets begins immediately following the parallel table
12062 (at offset 16 + 12 * M from the beginning of the section). The table is
12063 a two-dimensional array of 32-bit words (using the byte order of the
12064 application binary), with L columns and N+1 rows, in row-major order.
12065 Each row in the array is indexed starting from 0. The first row provides
12066 a key to the remaining rows: each column in this row provides an identifier
12067 for a debug section, and the offsets in the same column of subsequent rows
12068 refer to that section. The section identifiers are:
12070 DW_SECT_INFO 1 .debug_info.dwo
12071 DW_SECT_TYPES 2 .debug_types.dwo
12072 DW_SECT_ABBREV 3 .debug_abbrev.dwo
12073 DW_SECT_LINE 4 .debug_line.dwo
12074 DW_SECT_LOC 5 .debug_loc.dwo
12075 DW_SECT_STR_OFFSETS 6 .debug_str_offsets.dwo
12076 DW_SECT_MACINFO 7 .debug_macinfo.dwo
12077 DW_SECT_MACRO 8 .debug_macro.dwo
12079 The offsets provided by the CU and TU index sections are the base offsets
12080 for the contributions made by each CU or TU to the corresponding section
12081 in the package file. Each CU and TU header contains an abbrev_offset
12082 field, used to find the abbreviations table for that CU or TU within the
12083 contribution to the .debug_abbrev.dwo section for that CU or TU, and should
12084 be interpreted as relative to the base offset given in the index section.
12085 Likewise, offsets into .debug_line.dwo from DW_AT_stmt_list attributes
12086 should be interpreted as relative to the base offset for .debug_line.dwo,
12087 and offsets into other debug sections obtained from DWARF attributes should
12088 also be interpreted as relative to the corresponding base offset.
12090 The table of sizes begins immediately following the table of offsets.
12091 Like the table of offsets, it is a two-dimensional array of 32-bit words,
12092 with L columns and N rows, in row-major order. Each row in the array is
12093 indexed starting from 1 (row 0 is shared by the two tables).
12097 Hash table lookup is handled the same in version 1 and 2:
12099 We assume that N and M will not exceed 2^32 - 1.
12100 The size of the hash table, M, must be 2^k such that 2^k > 3*N/2.
12102 Given a 64-bit compilation unit signature or a type signature S, an entry
12103 in the hash table is located as follows:
12105 1) Calculate a primary hash H = S & MASK(k), where MASK(k) is a mask with
12106 the low-order k bits all set to 1.
12108 2) Calculate a secondary hash H' = (((S >> 32) & MASK(k)) | 1).
12110 3) If the hash table entry at index H matches the signature, use that
12111 entry. If the hash table entry at index H is unused (all zeroes),
12112 terminate the search: the signature is not present in the table.
12114 4) Let H = (H + H') modulo M. Repeat at Step 3.
12116 Because M > N and H' and M are relatively prime, the search is guaranteed
12117 to stop at an unused slot or find the match. */
12119 /* Create a hash table to map DWO IDs to their CU/TU entry in
12120 .debug_{info,types}.dwo in DWP_FILE.
12121 Returns NULL if there isn't one.
12122 Note: This function processes DWP files only, not DWO files. */
12124 static struct dwp_hash_table *
12125 create_dwp_hash_table (struct dwarf2_per_objfile *dwarf2_per_objfile,
12126 struct dwp_file *dwp_file, int is_debug_types)
12128 struct objfile *objfile = dwarf2_per_objfile->objfile;
12129 bfd *dbfd = dwp_file->dbfd;
12130 const gdb_byte *index_ptr, *index_end;
12131 struct dwarf2_section_info *index;
12132 uint32_t version, nr_columns, nr_units, nr_slots;
12133 struct dwp_hash_table *htab;
12135 if (is_debug_types)
12136 index = &dwp_file->sections.tu_index;
12138 index = &dwp_file->sections.cu_index;
12140 if (dwarf2_section_empty_p (index))
12142 dwarf2_read_section (objfile, index);
12144 index_ptr = index->buffer;
12145 index_end = index_ptr + index->size;
12147 version = read_4_bytes (dbfd, index_ptr);
12150 nr_columns = read_4_bytes (dbfd, index_ptr);
12154 nr_units = read_4_bytes (dbfd, index_ptr);
12156 nr_slots = read_4_bytes (dbfd, index_ptr);
12159 if (version != 1 && version != 2)
12161 error (_("Dwarf Error: unsupported DWP file version (%s)"
12162 " [in module %s]"),
12163 pulongest (version), dwp_file->name);
12165 if (nr_slots != (nr_slots & -nr_slots))
12167 error (_("Dwarf Error: number of slots in DWP hash table (%s)"
12168 " is not power of 2 [in module %s]"),
12169 pulongest (nr_slots), dwp_file->name);
12172 htab = OBSTACK_ZALLOC (&objfile->objfile_obstack, struct dwp_hash_table);
12173 htab->version = version;
12174 htab->nr_columns = nr_columns;
12175 htab->nr_units = nr_units;
12176 htab->nr_slots = nr_slots;
12177 htab->hash_table = index_ptr;
12178 htab->unit_table = htab->hash_table + sizeof (uint64_t) * nr_slots;
12180 /* Exit early if the table is empty. */
12181 if (nr_slots == 0 || nr_units == 0
12182 || (version == 2 && nr_columns == 0))
12184 /* All must be zero. */
12185 if (nr_slots != 0 || nr_units != 0
12186 || (version == 2 && nr_columns != 0))
12188 complaint (&symfile_complaints,
12189 _("Empty DWP but nr_slots,nr_units,nr_columns not"
12190 " all zero [in modules %s]"),
12198 htab->section_pool.v1.indices =
12199 htab->unit_table + sizeof (uint32_t) * nr_slots;
12200 /* It's harder to decide whether the section is too small in v1.
12201 V1 is deprecated anyway so we punt. */
12205 const gdb_byte *ids_ptr = htab->unit_table + sizeof (uint32_t) * nr_slots;
12206 int *ids = htab->section_pool.v2.section_ids;
12207 /* Reverse map for error checking. */
12208 int ids_seen[DW_SECT_MAX + 1];
12211 if (nr_columns < 2)
12213 error (_("Dwarf Error: bad DWP hash table, too few columns"
12214 " in section table [in module %s]"),
12217 if (nr_columns > MAX_NR_V2_DWO_SECTIONS)
12219 error (_("Dwarf Error: bad DWP hash table, too many columns"
12220 " in section table [in module %s]"),
12223 memset (ids, 255, (DW_SECT_MAX + 1) * sizeof (int32_t));
12224 memset (ids_seen, 255, (DW_SECT_MAX + 1) * sizeof (int32_t));
12225 for (i = 0; i < nr_columns; ++i)
12227 int id = read_4_bytes (dbfd, ids_ptr + i * sizeof (uint32_t));
12229 if (id < DW_SECT_MIN || id > DW_SECT_MAX)
12231 error (_("Dwarf Error: bad DWP hash table, bad section id %d"
12232 " in section table [in module %s]"),
12233 id, dwp_file->name);
12235 if (ids_seen[id] != -1)
12237 error (_("Dwarf Error: bad DWP hash table, duplicate section"
12238 " id %d in section table [in module %s]"),
12239 id, dwp_file->name);
12244 /* Must have exactly one info or types section. */
12245 if (((ids_seen[DW_SECT_INFO] != -1)
12246 + (ids_seen[DW_SECT_TYPES] != -1))
12249 error (_("Dwarf Error: bad DWP hash table, missing/duplicate"
12250 " DWO info/types section [in module %s]"),
12253 /* Must have an abbrev section. */
12254 if (ids_seen[DW_SECT_ABBREV] == -1)
12256 error (_("Dwarf Error: bad DWP hash table, missing DWO abbrev"
12257 " section [in module %s]"),
12260 htab->section_pool.v2.offsets = ids_ptr + sizeof (uint32_t) * nr_columns;
12261 htab->section_pool.v2.sizes =
12262 htab->section_pool.v2.offsets + (sizeof (uint32_t)
12263 * nr_units * nr_columns);
12264 if ((htab->section_pool.v2.sizes + (sizeof (uint32_t)
12265 * nr_units * nr_columns))
12268 error (_("Dwarf Error: DWP index section is corrupt (too small)"
12269 " [in module %s]"),
12277 /* Update SECTIONS with the data from SECTP.
12279 This function is like the other "locate" section routines that are
12280 passed to bfd_map_over_sections, but in this context the sections to
12281 read comes from the DWP V1 hash table, not the full ELF section table.
12283 The result is non-zero for success, or zero if an error was found. */
12286 locate_v1_virtual_dwo_sections (asection *sectp,
12287 struct virtual_v1_dwo_sections *sections)
12289 const struct dwop_section_names *names = &dwop_section_names;
12291 if (section_is_p (sectp->name, &names->abbrev_dwo))
12293 /* There can be only one. */
12294 if (sections->abbrev.s.section != NULL)
12296 sections->abbrev.s.section = sectp;
12297 sections->abbrev.size = bfd_get_section_size (sectp);
12299 else if (section_is_p (sectp->name, &names->info_dwo)
12300 || section_is_p (sectp->name, &names->types_dwo))
12302 /* There can be only one. */
12303 if (sections->info_or_types.s.section != NULL)
12305 sections->info_or_types.s.section = sectp;
12306 sections->info_or_types.size = bfd_get_section_size (sectp);
12308 else if (section_is_p (sectp->name, &names->line_dwo))
12310 /* There can be only one. */
12311 if (sections->line.s.section != NULL)
12313 sections->line.s.section = sectp;
12314 sections->line.size = bfd_get_section_size (sectp);
12316 else if (section_is_p (sectp->name, &names->loc_dwo))
12318 /* There can be only one. */
12319 if (sections->loc.s.section != NULL)
12321 sections->loc.s.section = sectp;
12322 sections->loc.size = bfd_get_section_size (sectp);
12324 else if (section_is_p (sectp->name, &names->macinfo_dwo))
12326 /* There can be only one. */
12327 if (sections->macinfo.s.section != NULL)
12329 sections->macinfo.s.section = sectp;
12330 sections->macinfo.size = bfd_get_section_size (sectp);
12332 else if (section_is_p (sectp->name, &names->macro_dwo))
12334 /* There can be only one. */
12335 if (sections->macro.s.section != NULL)
12337 sections->macro.s.section = sectp;
12338 sections->macro.size = bfd_get_section_size (sectp);
12340 else if (section_is_p (sectp->name, &names->str_offsets_dwo))
12342 /* There can be only one. */
12343 if (sections->str_offsets.s.section != NULL)
12345 sections->str_offsets.s.section = sectp;
12346 sections->str_offsets.size = bfd_get_section_size (sectp);
12350 /* No other kind of section is valid. */
12357 /* Create a dwo_unit object for the DWO unit with signature SIGNATURE.
12358 UNIT_INDEX is the index of the DWO unit in the DWP hash table.
12359 COMP_DIR is the DW_AT_comp_dir attribute of the referencing CU.
12360 This is for DWP version 1 files. */
12362 static struct dwo_unit *
12363 create_dwo_unit_in_dwp_v1 (struct dwarf2_per_objfile *dwarf2_per_objfile,
12364 struct dwp_file *dwp_file,
12365 uint32_t unit_index,
12366 const char *comp_dir,
12367 ULONGEST signature, int is_debug_types)
12369 struct objfile *objfile = dwarf2_per_objfile->objfile;
12370 const struct dwp_hash_table *dwp_htab =
12371 is_debug_types ? dwp_file->tus : dwp_file->cus;
12372 bfd *dbfd = dwp_file->dbfd;
12373 const char *kind = is_debug_types ? "TU" : "CU";
12374 struct dwo_file *dwo_file;
12375 struct dwo_unit *dwo_unit;
12376 struct virtual_v1_dwo_sections sections;
12377 void **dwo_file_slot;
12380 gdb_assert (dwp_file->version == 1);
12382 if (dwarf_read_debug)
12384 fprintf_unfiltered (gdb_stdlog, "Reading %s %s/%s in DWP V1 file: %s\n",
12386 pulongest (unit_index), hex_string (signature),
12390 /* Fetch the sections of this DWO unit.
12391 Put a limit on the number of sections we look for so that bad data
12392 doesn't cause us to loop forever. */
12394 #define MAX_NR_V1_DWO_SECTIONS \
12395 (1 /* .debug_info or .debug_types */ \
12396 + 1 /* .debug_abbrev */ \
12397 + 1 /* .debug_line */ \
12398 + 1 /* .debug_loc */ \
12399 + 1 /* .debug_str_offsets */ \
12400 + 1 /* .debug_macro or .debug_macinfo */ \
12401 + 1 /* trailing zero */)
12403 memset (§ions, 0, sizeof (sections));
12405 for (i = 0; i < MAX_NR_V1_DWO_SECTIONS; ++i)
12408 uint32_t section_nr =
12409 read_4_bytes (dbfd,
12410 dwp_htab->section_pool.v1.indices
12411 + (unit_index + i) * sizeof (uint32_t));
12413 if (section_nr == 0)
12415 if (section_nr >= dwp_file->num_sections)
12417 error (_("Dwarf Error: bad DWP hash table, section number too large"
12418 " [in module %s]"),
12422 sectp = dwp_file->elf_sections[section_nr];
12423 if (! locate_v1_virtual_dwo_sections (sectp, §ions))
12425 error (_("Dwarf Error: bad DWP hash table, invalid section found"
12426 " [in module %s]"),
12432 || dwarf2_section_empty_p (§ions.info_or_types)
12433 || dwarf2_section_empty_p (§ions.abbrev))
12435 error (_("Dwarf Error: bad DWP hash table, missing DWO sections"
12436 " [in module %s]"),
12439 if (i == MAX_NR_V1_DWO_SECTIONS)
12441 error (_("Dwarf Error: bad DWP hash table, too many DWO sections"
12442 " [in module %s]"),
12446 /* It's easier for the rest of the code if we fake a struct dwo_file and
12447 have dwo_unit "live" in that. At least for now.
12449 The DWP file can be made up of a random collection of CUs and TUs.
12450 However, for each CU + set of TUs that came from the same original DWO
12451 file, we can combine them back into a virtual DWO file to save space
12452 (fewer struct dwo_file objects to allocate). Remember that for really
12453 large apps there can be on the order of 8K CUs and 200K TUs, or more. */
12455 std::string virtual_dwo_name =
12456 string_printf ("virtual-dwo/%d-%d-%d-%d",
12457 get_section_id (§ions.abbrev),
12458 get_section_id (§ions.line),
12459 get_section_id (§ions.loc),
12460 get_section_id (§ions.str_offsets));
12461 /* Can we use an existing virtual DWO file? */
12462 dwo_file_slot = lookup_dwo_file_slot (dwarf2_per_objfile,
12463 virtual_dwo_name.c_str (),
12465 /* Create one if necessary. */
12466 if (*dwo_file_slot == NULL)
12468 if (dwarf_read_debug)
12470 fprintf_unfiltered (gdb_stdlog, "Creating virtual DWO: %s\n",
12471 virtual_dwo_name.c_str ());
12473 dwo_file = OBSTACK_ZALLOC (&objfile->objfile_obstack, struct dwo_file);
12475 = (const char *) obstack_copy0 (&objfile->objfile_obstack,
12476 virtual_dwo_name.c_str (),
12477 virtual_dwo_name.size ());
12478 dwo_file->comp_dir = comp_dir;
12479 dwo_file->sections.abbrev = sections.abbrev;
12480 dwo_file->sections.line = sections.line;
12481 dwo_file->sections.loc = sections.loc;
12482 dwo_file->sections.macinfo = sections.macinfo;
12483 dwo_file->sections.macro = sections.macro;
12484 dwo_file->sections.str_offsets = sections.str_offsets;
12485 /* The "str" section is global to the entire DWP file. */
12486 dwo_file->sections.str = dwp_file->sections.str;
12487 /* The info or types section is assigned below to dwo_unit,
12488 there's no need to record it in dwo_file.
12489 Also, we can't simply record type sections in dwo_file because
12490 we record a pointer into the vector in dwo_unit. As we collect more
12491 types we'll grow the vector and eventually have to reallocate space
12492 for it, invalidating all copies of pointers into the previous
12494 *dwo_file_slot = dwo_file;
12498 if (dwarf_read_debug)
12500 fprintf_unfiltered (gdb_stdlog, "Using existing virtual DWO: %s\n",
12501 virtual_dwo_name.c_str ());
12503 dwo_file = (struct dwo_file *) *dwo_file_slot;
12506 dwo_unit = OBSTACK_ZALLOC (&objfile->objfile_obstack, struct dwo_unit);
12507 dwo_unit->dwo_file = dwo_file;
12508 dwo_unit->signature = signature;
12509 dwo_unit->section =
12510 XOBNEW (&objfile->objfile_obstack, struct dwarf2_section_info);
12511 *dwo_unit->section = sections.info_or_types;
12512 /* dwo_unit->{offset,length,type_offset_in_tu} are set later. */
12517 /* Subroutine of create_dwo_unit_in_dwp_v2 to simplify it.
12518 Given a pointer to the containing section SECTION, and OFFSET,SIZE of the
12519 piece within that section used by a TU/CU, return a virtual section
12520 of just that piece. */
12522 static struct dwarf2_section_info
12523 create_dwp_v2_section (struct dwarf2_per_objfile *dwarf2_per_objfile,
12524 struct dwarf2_section_info *section,
12525 bfd_size_type offset, bfd_size_type size)
12527 struct dwarf2_section_info result;
12530 gdb_assert (section != NULL);
12531 gdb_assert (!section->is_virtual);
12533 memset (&result, 0, sizeof (result));
12534 result.s.containing_section = section;
12535 result.is_virtual = 1;
12540 sectp = get_section_bfd_section (section);
12542 /* Flag an error if the piece denoted by OFFSET,SIZE is outside the
12543 bounds of the real section. This is a pretty-rare event, so just
12544 flag an error (easier) instead of a warning and trying to cope. */
12546 || offset + size > bfd_get_section_size (sectp))
12548 error (_("Dwarf Error: Bad DWP V2 section info, doesn't fit"
12549 " in section %s [in module %s]"),
12550 sectp ? bfd_section_name (abfd, sectp) : "<unknown>",
12551 objfile_name (dwarf2_per_objfile->objfile));
12554 result.virtual_offset = offset;
12555 result.size = size;
12559 /* Create a dwo_unit object for the DWO unit with signature SIGNATURE.
12560 UNIT_INDEX is the index of the DWO unit in the DWP hash table.
12561 COMP_DIR is the DW_AT_comp_dir attribute of the referencing CU.
12562 This is for DWP version 2 files. */
12564 static struct dwo_unit *
12565 create_dwo_unit_in_dwp_v2 (struct dwarf2_per_objfile *dwarf2_per_objfile,
12566 struct dwp_file *dwp_file,
12567 uint32_t unit_index,
12568 const char *comp_dir,
12569 ULONGEST signature, int is_debug_types)
12571 struct objfile *objfile = dwarf2_per_objfile->objfile;
12572 const struct dwp_hash_table *dwp_htab =
12573 is_debug_types ? dwp_file->tus : dwp_file->cus;
12574 bfd *dbfd = dwp_file->dbfd;
12575 const char *kind = is_debug_types ? "TU" : "CU";
12576 struct dwo_file *dwo_file;
12577 struct dwo_unit *dwo_unit;
12578 struct virtual_v2_dwo_sections sections;
12579 void **dwo_file_slot;
12582 gdb_assert (dwp_file->version == 2);
12584 if (dwarf_read_debug)
12586 fprintf_unfiltered (gdb_stdlog, "Reading %s %s/%s in DWP V2 file: %s\n",
12588 pulongest (unit_index), hex_string (signature),
12592 /* Fetch the section offsets of this DWO unit. */
12594 memset (§ions, 0, sizeof (sections));
12596 for (i = 0; i < dwp_htab->nr_columns; ++i)
12598 uint32_t offset = read_4_bytes (dbfd,
12599 dwp_htab->section_pool.v2.offsets
12600 + (((unit_index - 1) * dwp_htab->nr_columns
12602 * sizeof (uint32_t)));
12603 uint32_t size = read_4_bytes (dbfd,
12604 dwp_htab->section_pool.v2.sizes
12605 + (((unit_index - 1) * dwp_htab->nr_columns
12607 * sizeof (uint32_t)));
12609 switch (dwp_htab->section_pool.v2.section_ids[i])
12612 case DW_SECT_TYPES:
12613 sections.info_or_types_offset = offset;
12614 sections.info_or_types_size = size;
12616 case DW_SECT_ABBREV:
12617 sections.abbrev_offset = offset;
12618 sections.abbrev_size = size;
12621 sections.line_offset = offset;
12622 sections.line_size = size;
12625 sections.loc_offset = offset;
12626 sections.loc_size = size;
12628 case DW_SECT_STR_OFFSETS:
12629 sections.str_offsets_offset = offset;
12630 sections.str_offsets_size = size;
12632 case DW_SECT_MACINFO:
12633 sections.macinfo_offset = offset;
12634 sections.macinfo_size = size;
12636 case DW_SECT_MACRO:
12637 sections.macro_offset = offset;
12638 sections.macro_size = size;
12643 /* It's easier for the rest of the code if we fake a struct dwo_file and
12644 have dwo_unit "live" in that. At least for now.
12646 The DWP file can be made up of a random collection of CUs and TUs.
12647 However, for each CU + set of TUs that came from the same original DWO
12648 file, we can combine them back into a virtual DWO file to save space
12649 (fewer struct dwo_file objects to allocate). Remember that for really
12650 large apps there can be on the order of 8K CUs and 200K TUs, or more. */
12652 std::string virtual_dwo_name =
12653 string_printf ("virtual-dwo/%ld-%ld-%ld-%ld",
12654 (long) (sections.abbrev_size ? sections.abbrev_offset : 0),
12655 (long) (sections.line_size ? sections.line_offset : 0),
12656 (long) (sections.loc_size ? sections.loc_offset : 0),
12657 (long) (sections.str_offsets_size
12658 ? sections.str_offsets_offset : 0));
12659 /* Can we use an existing virtual DWO file? */
12660 dwo_file_slot = lookup_dwo_file_slot (dwarf2_per_objfile,
12661 virtual_dwo_name.c_str (),
12663 /* Create one if necessary. */
12664 if (*dwo_file_slot == NULL)
12666 if (dwarf_read_debug)
12668 fprintf_unfiltered (gdb_stdlog, "Creating virtual DWO: %s\n",
12669 virtual_dwo_name.c_str ());
12671 dwo_file = OBSTACK_ZALLOC (&objfile->objfile_obstack, struct dwo_file);
12673 = (const char *) obstack_copy0 (&objfile->objfile_obstack,
12674 virtual_dwo_name.c_str (),
12675 virtual_dwo_name.size ());
12676 dwo_file->comp_dir = comp_dir;
12677 dwo_file->sections.abbrev =
12678 create_dwp_v2_section (dwarf2_per_objfile, &dwp_file->sections.abbrev,
12679 sections.abbrev_offset, sections.abbrev_size);
12680 dwo_file->sections.line =
12681 create_dwp_v2_section (dwarf2_per_objfile, &dwp_file->sections.line,
12682 sections.line_offset, sections.line_size);
12683 dwo_file->sections.loc =
12684 create_dwp_v2_section (dwarf2_per_objfile, &dwp_file->sections.loc,
12685 sections.loc_offset, sections.loc_size);
12686 dwo_file->sections.macinfo =
12687 create_dwp_v2_section (dwarf2_per_objfile, &dwp_file->sections.macinfo,
12688 sections.macinfo_offset, sections.macinfo_size);
12689 dwo_file->sections.macro =
12690 create_dwp_v2_section (dwarf2_per_objfile, &dwp_file->sections.macro,
12691 sections.macro_offset, sections.macro_size);
12692 dwo_file->sections.str_offsets =
12693 create_dwp_v2_section (dwarf2_per_objfile,
12694 &dwp_file->sections.str_offsets,
12695 sections.str_offsets_offset,
12696 sections.str_offsets_size);
12697 /* The "str" section is global to the entire DWP file. */
12698 dwo_file->sections.str = dwp_file->sections.str;
12699 /* The info or types section is assigned below to dwo_unit,
12700 there's no need to record it in dwo_file.
12701 Also, we can't simply record type sections in dwo_file because
12702 we record a pointer into the vector in dwo_unit. As we collect more
12703 types we'll grow the vector and eventually have to reallocate space
12704 for it, invalidating all copies of pointers into the previous
12706 *dwo_file_slot = dwo_file;
12710 if (dwarf_read_debug)
12712 fprintf_unfiltered (gdb_stdlog, "Using existing virtual DWO: %s\n",
12713 virtual_dwo_name.c_str ());
12715 dwo_file = (struct dwo_file *) *dwo_file_slot;
12718 dwo_unit = OBSTACK_ZALLOC (&objfile->objfile_obstack, struct dwo_unit);
12719 dwo_unit->dwo_file = dwo_file;
12720 dwo_unit->signature = signature;
12721 dwo_unit->section =
12722 XOBNEW (&objfile->objfile_obstack, struct dwarf2_section_info);
12723 *dwo_unit->section = create_dwp_v2_section (dwarf2_per_objfile,
12725 ? &dwp_file->sections.types
12726 : &dwp_file->sections.info,
12727 sections.info_or_types_offset,
12728 sections.info_or_types_size);
12729 /* dwo_unit->{offset,length,type_offset_in_tu} are set later. */
12734 /* Lookup the DWO unit with SIGNATURE in DWP_FILE.
12735 Returns NULL if the signature isn't found. */
12737 static struct dwo_unit *
12738 lookup_dwo_unit_in_dwp (struct dwarf2_per_objfile *dwarf2_per_objfile,
12739 struct dwp_file *dwp_file, const char *comp_dir,
12740 ULONGEST signature, int is_debug_types)
12742 const struct dwp_hash_table *dwp_htab =
12743 is_debug_types ? dwp_file->tus : dwp_file->cus;
12744 bfd *dbfd = dwp_file->dbfd;
12745 uint32_t mask = dwp_htab->nr_slots - 1;
12746 uint32_t hash = signature & mask;
12747 uint32_t hash2 = ((signature >> 32) & mask) | 1;
12750 struct dwo_unit find_dwo_cu;
12752 memset (&find_dwo_cu, 0, sizeof (find_dwo_cu));
12753 find_dwo_cu.signature = signature;
12754 slot = htab_find_slot (is_debug_types
12755 ? dwp_file->loaded_tus
12756 : dwp_file->loaded_cus,
12757 &find_dwo_cu, INSERT);
12760 return (struct dwo_unit *) *slot;
12762 /* Use a for loop so that we don't loop forever on bad debug info. */
12763 for (i = 0; i < dwp_htab->nr_slots; ++i)
12765 ULONGEST signature_in_table;
12767 signature_in_table =
12768 read_8_bytes (dbfd, dwp_htab->hash_table + hash * sizeof (uint64_t));
12769 if (signature_in_table == signature)
12771 uint32_t unit_index =
12772 read_4_bytes (dbfd,
12773 dwp_htab->unit_table + hash * sizeof (uint32_t));
12775 if (dwp_file->version == 1)
12777 *slot = create_dwo_unit_in_dwp_v1 (dwarf2_per_objfile,
12778 dwp_file, unit_index,
12779 comp_dir, signature,
12784 *slot = create_dwo_unit_in_dwp_v2 (dwarf2_per_objfile,
12785 dwp_file, unit_index,
12786 comp_dir, signature,
12789 return (struct dwo_unit *) *slot;
12791 if (signature_in_table == 0)
12793 hash = (hash + hash2) & mask;
12796 error (_("Dwarf Error: bad DWP hash table, lookup didn't terminate"
12797 " [in module %s]"),
12801 /* Subroutine of open_dwo_file,open_dwp_file to simplify them.
12802 Open the file specified by FILE_NAME and hand it off to BFD for
12803 preliminary analysis. Return a newly initialized bfd *, which
12804 includes a canonicalized copy of FILE_NAME.
12805 If IS_DWP is TRUE, we're opening a DWP file, otherwise a DWO file.
12806 SEARCH_CWD is true if the current directory is to be searched.
12807 It will be searched before debug-file-directory.
12808 If successful, the file is added to the bfd include table of the
12809 objfile's bfd (see gdb_bfd_record_inclusion).
12810 If unable to find/open the file, return NULL.
12811 NOTE: This function is derived from symfile_bfd_open. */
12813 static gdb_bfd_ref_ptr
12814 try_open_dwop_file (struct dwarf2_per_objfile *dwarf2_per_objfile,
12815 const char *file_name, int is_dwp, int search_cwd)
12818 /* Blech. OPF_TRY_CWD_FIRST also disables searching the path list if
12819 FILE_NAME contains a '/'. So we can't use it. Instead prepend "."
12820 to debug_file_directory. */
12821 const char *search_path;
12822 static const char dirname_separator_string[] = { DIRNAME_SEPARATOR, '\0' };
12824 gdb::unique_xmalloc_ptr<char> search_path_holder;
12827 if (*debug_file_directory != '\0')
12829 search_path_holder.reset (concat (".", dirname_separator_string,
12830 debug_file_directory,
12832 search_path = search_path_holder.get ();
12838 search_path = debug_file_directory;
12840 openp_flags flags = OPF_RETURN_REALPATH;
12842 flags |= OPF_SEARCH_IN_PATH;
12844 gdb::unique_xmalloc_ptr<char> absolute_name;
12845 desc = openp (search_path, flags, file_name,
12846 O_RDONLY | O_BINARY, &absolute_name);
12850 gdb_bfd_ref_ptr sym_bfd (gdb_bfd_open (absolute_name.get (),
12852 if (sym_bfd == NULL)
12854 bfd_set_cacheable (sym_bfd.get (), 1);
12856 if (!bfd_check_format (sym_bfd.get (), bfd_object))
12859 /* Success. Record the bfd as having been included by the objfile's bfd.
12860 This is important because things like demangled_names_hash lives in the
12861 objfile's per_bfd space and may have references to things like symbol
12862 names that live in the DWO/DWP file's per_bfd space. PR 16426. */
12863 gdb_bfd_record_inclusion (dwarf2_per_objfile->objfile->obfd, sym_bfd.get ());
12868 /* Try to open DWO file FILE_NAME.
12869 COMP_DIR is the DW_AT_comp_dir attribute.
12870 The result is the bfd handle of the file.
12871 If there is a problem finding or opening the file, return NULL.
12872 Upon success, the canonicalized path of the file is stored in the bfd,
12873 same as symfile_bfd_open. */
12875 static gdb_bfd_ref_ptr
12876 open_dwo_file (struct dwarf2_per_objfile *dwarf2_per_objfile,
12877 const char *file_name, const char *comp_dir)
12879 if (IS_ABSOLUTE_PATH (file_name))
12880 return try_open_dwop_file (dwarf2_per_objfile, file_name,
12881 0 /*is_dwp*/, 0 /*search_cwd*/);
12883 /* Before trying the search path, try DWO_NAME in COMP_DIR. */
12885 if (comp_dir != NULL)
12887 char *path_to_try = concat (comp_dir, SLASH_STRING,
12888 file_name, (char *) NULL);
12890 /* NOTE: If comp_dir is a relative path, this will also try the
12891 search path, which seems useful. */
12892 gdb_bfd_ref_ptr abfd (try_open_dwop_file (dwarf2_per_objfile,
12895 1 /*search_cwd*/));
12896 xfree (path_to_try);
12901 /* That didn't work, try debug-file-directory, which, despite its name,
12902 is a list of paths. */
12904 if (*debug_file_directory == '\0')
12907 return try_open_dwop_file (dwarf2_per_objfile, file_name,
12908 0 /*is_dwp*/, 1 /*search_cwd*/);
12911 /* This function is mapped across the sections and remembers the offset and
12912 size of each of the DWO debugging sections we are interested in. */
12915 dwarf2_locate_dwo_sections (bfd *abfd, asection *sectp, void *dwo_sections_ptr)
12917 struct dwo_sections *dwo_sections = (struct dwo_sections *) dwo_sections_ptr;
12918 const struct dwop_section_names *names = &dwop_section_names;
12920 if (section_is_p (sectp->name, &names->abbrev_dwo))
12922 dwo_sections->abbrev.s.section = sectp;
12923 dwo_sections->abbrev.size = bfd_get_section_size (sectp);
12925 else if (section_is_p (sectp->name, &names->info_dwo))
12927 dwo_sections->info.s.section = sectp;
12928 dwo_sections->info.size = bfd_get_section_size (sectp);
12930 else if (section_is_p (sectp->name, &names->line_dwo))
12932 dwo_sections->line.s.section = sectp;
12933 dwo_sections->line.size = bfd_get_section_size (sectp);
12935 else if (section_is_p (sectp->name, &names->loc_dwo))
12937 dwo_sections->loc.s.section = sectp;
12938 dwo_sections->loc.size = bfd_get_section_size (sectp);
12940 else if (section_is_p (sectp->name, &names->macinfo_dwo))
12942 dwo_sections->macinfo.s.section = sectp;
12943 dwo_sections->macinfo.size = bfd_get_section_size (sectp);
12945 else if (section_is_p (sectp->name, &names->macro_dwo))
12947 dwo_sections->macro.s.section = sectp;
12948 dwo_sections->macro.size = bfd_get_section_size (sectp);
12950 else if (section_is_p (sectp->name, &names->str_dwo))
12952 dwo_sections->str.s.section = sectp;
12953 dwo_sections->str.size = bfd_get_section_size (sectp);
12955 else if (section_is_p (sectp->name, &names->str_offsets_dwo))
12957 dwo_sections->str_offsets.s.section = sectp;
12958 dwo_sections->str_offsets.size = bfd_get_section_size (sectp);
12960 else if (section_is_p (sectp->name, &names->types_dwo))
12962 struct dwarf2_section_info type_section;
12964 memset (&type_section, 0, sizeof (type_section));
12965 type_section.s.section = sectp;
12966 type_section.size = bfd_get_section_size (sectp);
12967 VEC_safe_push (dwarf2_section_info_def, dwo_sections->types,
12972 /* Initialize the use of the DWO file specified by DWO_NAME and referenced
12973 by PER_CU. This is for the non-DWP case.
12974 The result is NULL if DWO_NAME can't be found. */
12976 static struct dwo_file *
12977 open_and_init_dwo_file (struct dwarf2_per_cu_data *per_cu,
12978 const char *dwo_name, const char *comp_dir)
12980 struct dwarf2_per_objfile *dwarf2_per_objfile = per_cu->dwarf2_per_objfile;
12981 struct objfile *objfile = dwarf2_per_objfile->objfile;
12983 gdb_bfd_ref_ptr dbfd (open_dwo_file (dwarf2_per_objfile, dwo_name, comp_dir));
12986 if (dwarf_read_debug)
12987 fprintf_unfiltered (gdb_stdlog, "DWO file not found: %s\n", dwo_name);
12991 /* We use a unique pointer here, despite the obstack allocation,
12992 because a dwo_file needs some cleanup if it is abandoned. */
12993 dwo_file_up dwo_file (OBSTACK_ZALLOC (&objfile->objfile_obstack,
12995 dwo_file->dwo_name = dwo_name;
12996 dwo_file->comp_dir = comp_dir;
12997 dwo_file->dbfd = dbfd.release ();
12999 bfd_map_over_sections (dwo_file->dbfd, dwarf2_locate_dwo_sections,
13000 &dwo_file->sections);
13002 create_cus_hash_table (dwarf2_per_objfile, *dwo_file, dwo_file->sections.info,
13005 create_debug_types_hash_table (dwarf2_per_objfile, dwo_file.get (),
13006 dwo_file->sections.types, dwo_file->tus);
13008 if (dwarf_read_debug)
13009 fprintf_unfiltered (gdb_stdlog, "DWO file found: %s\n", dwo_name);
13011 return dwo_file.release ();
13014 /* This function is mapped across the sections and remembers the offset and
13015 size of each of the DWP debugging sections common to version 1 and 2 that
13016 we are interested in. */
13019 dwarf2_locate_common_dwp_sections (bfd *abfd, asection *sectp,
13020 void *dwp_file_ptr)
13022 struct dwp_file *dwp_file = (struct dwp_file *) dwp_file_ptr;
13023 const struct dwop_section_names *names = &dwop_section_names;
13024 unsigned int elf_section_nr = elf_section_data (sectp)->this_idx;
13026 /* Record the ELF section number for later lookup: this is what the
13027 .debug_cu_index,.debug_tu_index tables use in DWP V1. */
13028 gdb_assert (elf_section_nr < dwp_file->num_sections);
13029 dwp_file->elf_sections[elf_section_nr] = sectp;
13031 /* Look for specific sections that we need. */
13032 if (section_is_p (sectp->name, &names->str_dwo))
13034 dwp_file->sections.str.s.section = sectp;
13035 dwp_file->sections.str.size = bfd_get_section_size (sectp);
13037 else if (section_is_p (sectp->name, &names->cu_index))
13039 dwp_file->sections.cu_index.s.section = sectp;
13040 dwp_file->sections.cu_index.size = bfd_get_section_size (sectp);
13042 else if (section_is_p (sectp->name, &names->tu_index))
13044 dwp_file->sections.tu_index.s.section = sectp;
13045 dwp_file->sections.tu_index.size = bfd_get_section_size (sectp);
13049 /* This function is mapped across the sections and remembers the offset and
13050 size of each of the DWP version 2 debugging sections that we are interested
13051 in. This is split into a separate function because we don't know if we
13052 have version 1 or 2 until we parse the cu_index/tu_index sections. */
13055 dwarf2_locate_v2_dwp_sections (bfd *abfd, asection *sectp, void *dwp_file_ptr)
13057 struct dwp_file *dwp_file = (struct dwp_file *) dwp_file_ptr;
13058 const struct dwop_section_names *names = &dwop_section_names;
13059 unsigned int elf_section_nr = elf_section_data (sectp)->this_idx;
13061 /* Record the ELF section number for later lookup: this is what the
13062 .debug_cu_index,.debug_tu_index tables use in DWP V1. */
13063 gdb_assert (elf_section_nr < dwp_file->num_sections);
13064 dwp_file->elf_sections[elf_section_nr] = sectp;
13066 /* Look for specific sections that we need. */
13067 if (section_is_p (sectp->name, &names->abbrev_dwo))
13069 dwp_file->sections.abbrev.s.section = sectp;
13070 dwp_file->sections.abbrev.size = bfd_get_section_size (sectp);
13072 else if (section_is_p (sectp->name, &names->info_dwo))
13074 dwp_file->sections.info.s.section = sectp;
13075 dwp_file->sections.info.size = bfd_get_section_size (sectp);
13077 else if (section_is_p (sectp->name, &names->line_dwo))
13079 dwp_file->sections.line.s.section = sectp;
13080 dwp_file->sections.line.size = bfd_get_section_size (sectp);
13082 else if (section_is_p (sectp->name, &names->loc_dwo))
13084 dwp_file->sections.loc.s.section = sectp;
13085 dwp_file->sections.loc.size = bfd_get_section_size (sectp);
13087 else if (section_is_p (sectp->name, &names->macinfo_dwo))
13089 dwp_file->sections.macinfo.s.section = sectp;
13090 dwp_file->sections.macinfo.size = bfd_get_section_size (sectp);
13092 else if (section_is_p (sectp->name, &names->macro_dwo))
13094 dwp_file->sections.macro.s.section = sectp;
13095 dwp_file->sections.macro.size = bfd_get_section_size (sectp);
13097 else if (section_is_p (sectp->name, &names->str_offsets_dwo))
13099 dwp_file->sections.str_offsets.s.section = sectp;
13100 dwp_file->sections.str_offsets.size = bfd_get_section_size (sectp);
13102 else if (section_is_p (sectp->name, &names->types_dwo))
13104 dwp_file->sections.types.s.section = sectp;
13105 dwp_file->sections.types.size = bfd_get_section_size (sectp);
13109 /* Hash function for dwp_file loaded CUs/TUs. */
13112 hash_dwp_loaded_cutus (const void *item)
13114 const struct dwo_unit *dwo_unit = (const struct dwo_unit *) item;
13116 /* This drops the top 32 bits of the signature, but is ok for a hash. */
13117 return dwo_unit->signature;
13120 /* Equality function for dwp_file loaded CUs/TUs. */
13123 eq_dwp_loaded_cutus (const void *a, const void *b)
13125 const struct dwo_unit *dua = (const struct dwo_unit *) a;
13126 const struct dwo_unit *dub = (const struct dwo_unit *) b;
13128 return dua->signature == dub->signature;
13131 /* Allocate a hash table for dwp_file loaded CUs/TUs. */
13134 allocate_dwp_loaded_cutus_table (struct objfile *objfile)
13136 return htab_create_alloc_ex (3,
13137 hash_dwp_loaded_cutus,
13138 eq_dwp_loaded_cutus,
13140 &objfile->objfile_obstack,
13141 hashtab_obstack_allocate,
13142 dummy_obstack_deallocate);
13145 /* Try to open DWP file FILE_NAME.
13146 The result is the bfd handle of the file.
13147 If there is a problem finding or opening the file, return NULL.
13148 Upon success, the canonicalized path of the file is stored in the bfd,
13149 same as symfile_bfd_open. */
13151 static gdb_bfd_ref_ptr
13152 open_dwp_file (struct dwarf2_per_objfile *dwarf2_per_objfile,
13153 const char *file_name)
13155 gdb_bfd_ref_ptr abfd (try_open_dwop_file (dwarf2_per_objfile, file_name,
13157 1 /*search_cwd*/));
13161 /* Work around upstream bug 15652.
13162 http://sourceware.org/bugzilla/show_bug.cgi?id=15652
13163 [Whether that's a "bug" is debatable, but it is getting in our way.]
13164 We have no real idea where the dwp file is, because gdb's realpath-ing
13165 of the executable's path may have discarded the needed info.
13166 [IWBN if the dwp file name was recorded in the executable, akin to
13167 .gnu_debuglink, but that doesn't exist yet.]
13168 Strip the directory from FILE_NAME and search again. */
13169 if (*debug_file_directory != '\0')
13171 /* Don't implicitly search the current directory here.
13172 If the user wants to search "." to handle this case,
13173 it must be added to debug-file-directory. */
13174 return try_open_dwop_file (dwarf2_per_objfile,
13175 lbasename (file_name), 1 /*is_dwp*/,
13182 /* Initialize the use of the DWP file for the current objfile.
13183 By convention the name of the DWP file is ${objfile}.dwp.
13184 The result is NULL if it can't be found. */
13186 static struct dwp_file *
13187 open_and_init_dwp_file (struct dwarf2_per_objfile *dwarf2_per_objfile)
13189 struct objfile *objfile = dwarf2_per_objfile->objfile;
13190 struct dwp_file *dwp_file;
13192 /* Try to find first .dwp for the binary file before any symbolic links
13195 /* If the objfile is a debug file, find the name of the real binary
13196 file and get the name of dwp file from there. */
13197 std::string dwp_name;
13198 if (objfile->separate_debug_objfile_backlink != NULL)
13200 struct objfile *backlink = objfile->separate_debug_objfile_backlink;
13201 const char *backlink_basename = lbasename (backlink->original_name);
13203 dwp_name = ldirname (objfile->original_name) + SLASH_STRING + backlink_basename;
13206 dwp_name = objfile->original_name;
13208 dwp_name += ".dwp";
13210 gdb_bfd_ref_ptr dbfd (open_dwp_file (dwarf2_per_objfile, dwp_name.c_str ()));
13212 && strcmp (objfile->original_name, objfile_name (objfile)) != 0)
13214 /* Try to find .dwp for the binary file after gdb_realpath resolving. */
13215 dwp_name = objfile_name (objfile);
13216 dwp_name += ".dwp";
13217 dbfd = open_dwp_file (dwarf2_per_objfile, dwp_name.c_str ());
13222 if (dwarf_read_debug)
13223 fprintf_unfiltered (gdb_stdlog, "DWP file not found: %s\n", dwp_name.c_str ());
13226 dwp_file = OBSTACK_ZALLOC (&objfile->objfile_obstack, struct dwp_file);
13227 dwp_file->name = bfd_get_filename (dbfd.get ());
13228 dwp_file->dbfd = dbfd.release ();
13230 /* +1: section 0 is unused */
13231 dwp_file->num_sections = bfd_count_sections (dwp_file->dbfd) + 1;
13232 dwp_file->elf_sections =
13233 OBSTACK_CALLOC (&objfile->objfile_obstack,
13234 dwp_file->num_sections, asection *);
13236 bfd_map_over_sections (dwp_file->dbfd, dwarf2_locate_common_dwp_sections,
13239 dwp_file->cus = create_dwp_hash_table (dwarf2_per_objfile, dwp_file, 0);
13241 dwp_file->tus = create_dwp_hash_table (dwarf2_per_objfile, dwp_file, 1);
13243 /* The DWP file version is stored in the hash table. Oh well. */
13244 if (dwp_file->cus && dwp_file->tus
13245 && dwp_file->cus->version != dwp_file->tus->version)
13247 /* Technically speaking, we should try to limp along, but this is
13248 pretty bizarre. We use pulongest here because that's the established
13249 portability solution (e.g, we cannot use %u for uint32_t). */
13250 error (_("Dwarf Error: DWP file CU version %s doesn't match"
13251 " TU version %s [in DWP file %s]"),
13252 pulongest (dwp_file->cus->version),
13253 pulongest (dwp_file->tus->version), dwp_name.c_str ());
13257 dwp_file->version = dwp_file->cus->version;
13258 else if (dwp_file->tus)
13259 dwp_file->version = dwp_file->tus->version;
13261 dwp_file->version = 2;
13263 if (dwp_file->version == 2)
13264 bfd_map_over_sections (dwp_file->dbfd, dwarf2_locate_v2_dwp_sections,
13267 dwp_file->loaded_cus = allocate_dwp_loaded_cutus_table (objfile);
13268 dwp_file->loaded_tus = allocate_dwp_loaded_cutus_table (objfile);
13270 if (dwarf_read_debug)
13272 fprintf_unfiltered (gdb_stdlog, "DWP file found: %s\n", dwp_file->name);
13273 fprintf_unfiltered (gdb_stdlog,
13274 " %s CUs, %s TUs\n",
13275 pulongest (dwp_file->cus ? dwp_file->cus->nr_units : 0),
13276 pulongest (dwp_file->tus ? dwp_file->tus->nr_units : 0));
13282 /* Wrapper around open_and_init_dwp_file, only open it once. */
13284 static struct dwp_file *
13285 get_dwp_file (struct dwarf2_per_objfile *dwarf2_per_objfile)
13287 if (! dwarf2_per_objfile->dwp_checked)
13289 dwarf2_per_objfile->dwp_file
13290 = open_and_init_dwp_file (dwarf2_per_objfile);
13291 dwarf2_per_objfile->dwp_checked = 1;
13293 return dwarf2_per_objfile->dwp_file;
13296 /* Subroutine of lookup_dwo_comp_unit, lookup_dwo_type_unit.
13297 Look up the CU/TU with signature SIGNATURE, either in DWO file DWO_NAME
13298 or in the DWP file for the objfile, referenced by THIS_UNIT.
13299 If non-NULL, comp_dir is the DW_AT_comp_dir attribute.
13300 IS_DEBUG_TYPES is non-zero if reading a TU, otherwise read a CU.
13302 This is called, for example, when wanting to read a variable with a
13303 complex location. Therefore we don't want to do file i/o for every call.
13304 Therefore we don't want to look for a DWO file on every call.
13305 Therefore we first see if we've already seen SIGNATURE in a DWP file,
13306 then we check if we've already seen DWO_NAME, and only THEN do we check
13309 The result is a pointer to the dwo_unit object or NULL if we didn't find it
13310 (dwo_id mismatch or couldn't find the DWO/DWP file). */
13312 static struct dwo_unit *
13313 lookup_dwo_cutu (struct dwarf2_per_cu_data *this_unit,
13314 const char *dwo_name, const char *comp_dir,
13315 ULONGEST signature, int is_debug_types)
13317 struct dwarf2_per_objfile *dwarf2_per_objfile = this_unit->dwarf2_per_objfile;
13318 struct objfile *objfile = dwarf2_per_objfile->objfile;
13319 const char *kind = is_debug_types ? "TU" : "CU";
13320 void **dwo_file_slot;
13321 struct dwo_file *dwo_file;
13322 struct dwp_file *dwp_file;
13324 /* First see if there's a DWP file.
13325 If we have a DWP file but didn't find the DWO inside it, don't
13326 look for the original DWO file. It makes gdb behave differently
13327 depending on whether one is debugging in the build tree. */
13329 dwp_file = get_dwp_file (dwarf2_per_objfile);
13330 if (dwp_file != NULL)
13332 const struct dwp_hash_table *dwp_htab =
13333 is_debug_types ? dwp_file->tus : dwp_file->cus;
13335 if (dwp_htab != NULL)
13337 struct dwo_unit *dwo_cutu =
13338 lookup_dwo_unit_in_dwp (dwarf2_per_objfile, dwp_file, comp_dir,
13339 signature, is_debug_types);
13341 if (dwo_cutu != NULL)
13343 if (dwarf_read_debug)
13345 fprintf_unfiltered (gdb_stdlog,
13346 "Virtual DWO %s %s found: @%s\n",
13347 kind, hex_string (signature),
13348 host_address_to_string (dwo_cutu));
13356 /* No DWP file, look for the DWO file. */
13358 dwo_file_slot = lookup_dwo_file_slot (dwarf2_per_objfile,
13359 dwo_name, comp_dir);
13360 if (*dwo_file_slot == NULL)
13362 /* Read in the file and build a table of the CUs/TUs it contains. */
13363 *dwo_file_slot = open_and_init_dwo_file (this_unit, dwo_name, comp_dir);
13365 /* NOTE: This will be NULL if unable to open the file. */
13366 dwo_file = (struct dwo_file *) *dwo_file_slot;
13368 if (dwo_file != NULL)
13370 struct dwo_unit *dwo_cutu = NULL;
13372 if (is_debug_types && dwo_file->tus)
13374 struct dwo_unit find_dwo_cutu;
13376 memset (&find_dwo_cutu, 0, sizeof (find_dwo_cutu));
13377 find_dwo_cutu.signature = signature;
13379 = (struct dwo_unit *) htab_find (dwo_file->tus, &find_dwo_cutu);
13381 else if (!is_debug_types && dwo_file->cus)
13383 struct dwo_unit find_dwo_cutu;
13385 memset (&find_dwo_cutu, 0, sizeof (find_dwo_cutu));
13386 find_dwo_cutu.signature = signature;
13387 dwo_cutu = (struct dwo_unit *)htab_find (dwo_file->cus,
13391 if (dwo_cutu != NULL)
13393 if (dwarf_read_debug)
13395 fprintf_unfiltered (gdb_stdlog, "DWO %s %s(%s) found: @%s\n",
13396 kind, dwo_name, hex_string (signature),
13397 host_address_to_string (dwo_cutu));
13404 /* We didn't find it. This could mean a dwo_id mismatch, or
13405 someone deleted the DWO/DWP file, or the search path isn't set up
13406 correctly to find the file. */
13408 if (dwarf_read_debug)
13410 fprintf_unfiltered (gdb_stdlog, "DWO %s %s(%s) not found\n",
13411 kind, dwo_name, hex_string (signature));
13414 /* This is a warning and not a complaint because it can be caused by
13415 pilot error (e.g., user accidentally deleting the DWO). */
13417 /* Print the name of the DWP file if we looked there, helps the user
13418 better diagnose the problem. */
13419 std::string dwp_text;
13421 if (dwp_file != NULL)
13422 dwp_text = string_printf (" [in DWP file %s]",
13423 lbasename (dwp_file->name));
13425 warning (_("Could not find DWO %s %s(%s)%s referenced by %s at offset %s"
13426 " [in module %s]"),
13427 kind, dwo_name, hex_string (signature),
13429 this_unit->is_debug_types ? "TU" : "CU",
13430 sect_offset_str (this_unit->sect_off), objfile_name (objfile));
13435 /* Lookup the DWO CU DWO_NAME/SIGNATURE referenced from THIS_CU.
13436 See lookup_dwo_cutu_unit for details. */
13438 static struct dwo_unit *
13439 lookup_dwo_comp_unit (struct dwarf2_per_cu_data *this_cu,
13440 const char *dwo_name, const char *comp_dir,
13441 ULONGEST signature)
13443 return lookup_dwo_cutu (this_cu, dwo_name, comp_dir, signature, 0);
13446 /* Lookup the DWO TU DWO_NAME/SIGNATURE referenced from THIS_TU.
13447 See lookup_dwo_cutu_unit for details. */
13449 static struct dwo_unit *
13450 lookup_dwo_type_unit (struct signatured_type *this_tu,
13451 const char *dwo_name, const char *comp_dir)
13453 return lookup_dwo_cutu (&this_tu->per_cu, dwo_name, comp_dir, this_tu->signature, 1);
13456 /* Traversal function for queue_and_load_all_dwo_tus. */
13459 queue_and_load_dwo_tu (void **slot, void *info)
13461 struct dwo_unit *dwo_unit = (struct dwo_unit *) *slot;
13462 struct dwarf2_per_cu_data *per_cu = (struct dwarf2_per_cu_data *) info;
13463 ULONGEST signature = dwo_unit->signature;
13464 struct signatured_type *sig_type =
13465 lookup_dwo_signatured_type (per_cu->cu, signature);
13467 if (sig_type != NULL)
13469 struct dwarf2_per_cu_data *sig_cu = &sig_type->per_cu;
13471 /* We pass NULL for DEPENDENT_CU because we don't yet know if there's
13472 a real dependency of PER_CU on SIG_TYPE. That is detected later
13473 while processing PER_CU. */
13474 if (maybe_queue_comp_unit (NULL, sig_cu, per_cu->cu->language))
13475 load_full_type_unit (sig_cu);
13476 VEC_safe_push (dwarf2_per_cu_ptr, per_cu->imported_symtabs, sig_cu);
13482 /* Queue all TUs contained in the DWO of PER_CU to be read in.
13483 The DWO may have the only definition of the type, though it may not be
13484 referenced anywhere in PER_CU. Thus we have to load *all* its TUs.
13485 http://sourceware.org/bugzilla/show_bug.cgi?id=15021 */
13488 queue_and_load_all_dwo_tus (struct dwarf2_per_cu_data *per_cu)
13490 struct dwo_unit *dwo_unit;
13491 struct dwo_file *dwo_file;
13493 gdb_assert (!per_cu->is_debug_types);
13494 gdb_assert (get_dwp_file (per_cu->dwarf2_per_objfile) == NULL);
13495 gdb_assert (per_cu->cu != NULL);
13497 dwo_unit = per_cu->cu->dwo_unit;
13498 gdb_assert (dwo_unit != NULL);
13500 dwo_file = dwo_unit->dwo_file;
13501 if (dwo_file->tus != NULL)
13502 htab_traverse_noresize (dwo_file->tus, queue_and_load_dwo_tu, per_cu);
13505 /* Free all resources associated with DWO_FILE.
13506 Close the DWO file and munmap the sections. */
13509 free_dwo_file (struct dwo_file *dwo_file)
13511 /* Note: dbfd is NULL for virtual DWO files. */
13512 gdb_bfd_unref (dwo_file->dbfd);
13514 VEC_free (dwarf2_section_info_def, dwo_file->sections.types);
13517 /* Traversal function for free_dwo_files. */
13520 free_dwo_file_from_slot (void **slot, void *info)
13522 struct dwo_file *dwo_file = (struct dwo_file *) *slot;
13524 free_dwo_file (dwo_file);
13529 /* Free all resources associated with DWO_FILES. */
13532 free_dwo_files (htab_t dwo_files, struct objfile *objfile)
13534 htab_traverse_noresize (dwo_files, free_dwo_file_from_slot, objfile);
13537 /* Read in various DIEs. */
13539 /* DW_AT_abstract_origin inherits whole DIEs (not just their attributes).
13540 Inherit only the children of the DW_AT_abstract_origin DIE not being
13541 already referenced by DW_AT_abstract_origin from the children of the
13545 inherit_abstract_dies (struct die_info *die, struct dwarf2_cu *cu)
13547 struct die_info *child_die;
13548 sect_offset *offsetp;
13549 /* Parent of DIE - referenced by DW_AT_abstract_origin. */
13550 struct die_info *origin_die;
13551 /* Iterator of the ORIGIN_DIE children. */
13552 struct die_info *origin_child_die;
13553 struct attribute *attr;
13554 struct dwarf2_cu *origin_cu;
13555 struct pending **origin_previous_list_in_scope;
13557 attr = dwarf2_attr (die, DW_AT_abstract_origin, cu);
13561 /* Note that following die references may follow to a die in a
13565 origin_die = follow_die_ref (die, attr, &origin_cu);
13567 /* We're inheriting ORIGIN's children into the scope we'd put DIE's
13569 origin_previous_list_in_scope = origin_cu->list_in_scope;
13570 origin_cu->list_in_scope = cu->list_in_scope;
13572 if (die->tag != origin_die->tag
13573 && !(die->tag == DW_TAG_inlined_subroutine
13574 && origin_die->tag == DW_TAG_subprogram))
13575 complaint (&symfile_complaints,
13576 _("DIE %s and its abstract origin %s have different tags"),
13577 sect_offset_str (die->sect_off),
13578 sect_offset_str (origin_die->sect_off));
13580 std::vector<sect_offset> offsets;
13582 for (child_die = die->child;
13583 child_die && child_die->tag;
13584 child_die = sibling_die (child_die))
13586 struct die_info *child_origin_die;
13587 struct dwarf2_cu *child_origin_cu;
13589 /* We are trying to process concrete instance entries:
13590 DW_TAG_call_site DIEs indeed have a DW_AT_abstract_origin tag, but
13591 it's not relevant to our analysis here. i.e. detecting DIEs that are
13592 present in the abstract instance but not referenced in the concrete
13594 if (child_die->tag == DW_TAG_call_site
13595 || child_die->tag == DW_TAG_GNU_call_site)
13598 /* For each CHILD_DIE, find the corresponding child of
13599 ORIGIN_DIE. If there is more than one layer of
13600 DW_AT_abstract_origin, follow them all; there shouldn't be,
13601 but GCC versions at least through 4.4 generate this (GCC PR
13603 child_origin_die = child_die;
13604 child_origin_cu = cu;
13607 attr = dwarf2_attr (child_origin_die, DW_AT_abstract_origin,
13611 child_origin_die = follow_die_ref (child_origin_die, attr,
13615 /* According to DWARF3 3.3.8.2 #3 new entries without their abstract
13616 counterpart may exist. */
13617 if (child_origin_die != child_die)
13619 if (child_die->tag != child_origin_die->tag
13620 && !(child_die->tag == DW_TAG_inlined_subroutine
13621 && child_origin_die->tag == DW_TAG_subprogram))
13622 complaint (&symfile_complaints,
13623 _("Child DIE %s and its abstract origin %s have "
13625 sect_offset_str (child_die->sect_off),
13626 sect_offset_str (child_origin_die->sect_off));
13627 if (child_origin_die->parent != origin_die)
13628 complaint (&symfile_complaints,
13629 _("Child DIE %s and its abstract origin %s have "
13630 "different parents"),
13631 sect_offset_str (child_die->sect_off),
13632 sect_offset_str (child_origin_die->sect_off));
13634 offsets.push_back (child_origin_die->sect_off);
13637 std::sort (offsets.begin (), offsets.end ());
13638 sect_offset *offsets_end = offsets.data () + offsets.size ();
13639 for (offsetp = offsets.data () + 1; offsetp < offsets_end; offsetp++)
13640 if (offsetp[-1] == *offsetp)
13641 complaint (&symfile_complaints,
13642 _("Multiple children of DIE %s refer "
13643 "to DIE %s as their abstract origin"),
13644 sect_offset_str (die->sect_off), sect_offset_str (*offsetp));
13646 offsetp = offsets.data ();
13647 origin_child_die = origin_die->child;
13648 while (origin_child_die && origin_child_die->tag)
13650 /* Is ORIGIN_CHILD_DIE referenced by any of the DIE children? */
13651 while (offsetp < offsets_end
13652 && *offsetp < origin_child_die->sect_off)
13654 if (offsetp >= offsets_end
13655 || *offsetp > origin_child_die->sect_off)
13657 /* Found that ORIGIN_CHILD_DIE is really not referenced.
13658 Check whether we're already processing ORIGIN_CHILD_DIE.
13659 This can happen with mutually referenced abstract_origins.
13661 if (!origin_child_die->in_process)
13662 process_die (origin_child_die, origin_cu);
13664 origin_child_die = sibling_die (origin_child_die);
13666 origin_cu->list_in_scope = origin_previous_list_in_scope;
13670 read_func_scope (struct die_info *die, struct dwarf2_cu *cu)
13672 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
13673 struct gdbarch *gdbarch = get_objfile_arch (objfile);
13674 struct context_stack *newobj;
13677 struct die_info *child_die;
13678 struct attribute *attr, *call_line, *call_file;
13680 CORE_ADDR baseaddr;
13681 struct block *block;
13682 int inlined_func = (die->tag == DW_TAG_inlined_subroutine);
13683 std::vector<struct symbol *> template_args;
13684 struct template_symbol *templ_func = NULL;
13688 /* If we do not have call site information, we can't show the
13689 caller of this inlined function. That's too confusing, so
13690 only use the scope for local variables. */
13691 call_line = dwarf2_attr (die, DW_AT_call_line, cu);
13692 call_file = dwarf2_attr (die, DW_AT_call_file, cu);
13693 if (call_line == NULL || call_file == NULL)
13695 read_lexical_block_scope (die, cu);
13700 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
13702 name = dwarf2_name (die, cu);
13704 /* Ignore functions with missing or empty names. These are actually
13705 illegal according to the DWARF standard. */
13708 complaint (&symfile_complaints,
13709 _("missing name for subprogram DIE at %s"),
13710 sect_offset_str (die->sect_off));
13714 /* Ignore functions with missing or invalid low and high pc attributes. */
13715 if (dwarf2_get_pc_bounds (die, &lowpc, &highpc, cu, NULL)
13716 <= PC_BOUNDS_INVALID)
13718 attr = dwarf2_attr (die, DW_AT_external, cu);
13719 if (!attr || !DW_UNSND (attr))
13720 complaint (&symfile_complaints,
13721 _("cannot get low and high bounds "
13722 "for subprogram DIE at %s"),
13723 sect_offset_str (die->sect_off));
13727 lowpc = gdbarch_adjust_dwarf2_addr (gdbarch, lowpc + baseaddr);
13728 highpc = gdbarch_adjust_dwarf2_addr (gdbarch, highpc + baseaddr);
13730 /* If we have any template arguments, then we must allocate a
13731 different sort of symbol. */
13732 for (child_die = die->child; child_die; child_die = sibling_die (child_die))
13734 if (child_die->tag == DW_TAG_template_type_param
13735 || child_die->tag == DW_TAG_template_value_param)
13737 templ_func = allocate_template_symbol (objfile);
13738 templ_func->subclass = SYMBOL_TEMPLATE;
13743 newobj = push_context (0, lowpc);
13744 newobj->name = new_symbol (die, read_type_die (die, cu), cu,
13745 (struct symbol *) templ_func);
13747 /* If there is a location expression for DW_AT_frame_base, record
13749 attr = dwarf2_attr (die, DW_AT_frame_base, cu);
13751 dwarf2_symbol_mark_computed (attr, newobj->name, cu, 1);
13753 /* If there is a location for the static link, record it. */
13754 newobj->static_link = NULL;
13755 attr = dwarf2_attr (die, DW_AT_static_link, cu);
13758 newobj->static_link
13759 = XOBNEW (&objfile->objfile_obstack, struct dynamic_prop);
13760 attr_to_dynamic_prop (attr, die, cu, newobj->static_link);
13763 cu->list_in_scope = &local_symbols;
13765 if (die->child != NULL)
13767 child_die = die->child;
13768 while (child_die && child_die->tag)
13770 if (child_die->tag == DW_TAG_template_type_param
13771 || child_die->tag == DW_TAG_template_value_param)
13773 struct symbol *arg = new_symbol (child_die, NULL, cu);
13776 template_args.push_back (arg);
13779 process_die (child_die, cu);
13780 child_die = sibling_die (child_die);
13784 inherit_abstract_dies (die, cu);
13786 /* If we have a DW_AT_specification, we might need to import using
13787 directives from the context of the specification DIE. See the
13788 comment in determine_prefix. */
13789 if (cu->language == language_cplus
13790 && dwarf2_attr (die, DW_AT_specification, cu))
13792 struct dwarf2_cu *spec_cu = cu;
13793 struct die_info *spec_die = die_specification (die, &spec_cu);
13797 child_die = spec_die->child;
13798 while (child_die && child_die->tag)
13800 if (child_die->tag == DW_TAG_imported_module)
13801 process_die (child_die, spec_cu);
13802 child_die = sibling_die (child_die);
13805 /* In some cases, GCC generates specification DIEs that
13806 themselves contain DW_AT_specification attributes. */
13807 spec_die = die_specification (spec_die, &spec_cu);
13811 newobj = pop_context ();
13812 /* Make a block for the local symbols within. */
13813 block = finish_block (newobj->name, &local_symbols, newobj->old_blocks,
13814 newobj->static_link, lowpc, highpc);
13816 /* For C++, set the block's scope. */
13817 if ((cu->language == language_cplus
13818 || cu->language == language_fortran
13819 || cu->language == language_d
13820 || cu->language == language_rust)
13821 && cu->processing_has_namespace_info)
13822 block_set_scope (block, determine_prefix (die, cu),
13823 &objfile->objfile_obstack);
13825 /* If we have address ranges, record them. */
13826 dwarf2_record_block_ranges (die, block, baseaddr, cu);
13828 gdbarch_make_symbol_special (gdbarch, newobj->name, objfile);
13830 /* Attach template arguments to function. */
13831 if (!template_args.empty ())
13833 gdb_assert (templ_func != NULL);
13835 templ_func->n_template_arguments = template_args.size ();
13836 templ_func->template_arguments
13837 = XOBNEWVEC (&objfile->objfile_obstack, struct symbol *,
13838 templ_func->n_template_arguments);
13839 memcpy (templ_func->template_arguments,
13840 template_args.data (),
13841 (templ_func->n_template_arguments * sizeof (struct symbol *)));
13844 /* In C++, we can have functions nested inside functions (e.g., when
13845 a function declares a class that has methods). This means that
13846 when we finish processing a function scope, we may need to go
13847 back to building a containing block's symbol lists. */
13848 local_symbols = newobj->locals;
13849 local_using_directives = newobj->local_using_directives;
13851 /* If we've finished processing a top-level function, subsequent
13852 symbols go in the file symbol list. */
13853 if (outermost_context_p ())
13854 cu->list_in_scope = &file_symbols;
13857 /* Process all the DIES contained within a lexical block scope. Start
13858 a new scope, process the dies, and then close the scope. */
13861 read_lexical_block_scope (struct die_info *die, struct dwarf2_cu *cu)
13863 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
13864 struct gdbarch *gdbarch = get_objfile_arch (objfile);
13865 struct context_stack *newobj;
13866 CORE_ADDR lowpc, highpc;
13867 struct die_info *child_die;
13868 CORE_ADDR baseaddr;
13870 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
13872 /* Ignore blocks with missing or invalid low and high pc attributes. */
13873 /* ??? Perhaps consider discontiguous blocks defined by DW_AT_ranges
13874 as multiple lexical blocks? Handling children in a sane way would
13875 be nasty. Might be easier to properly extend generic blocks to
13876 describe ranges. */
13877 switch (dwarf2_get_pc_bounds (die, &lowpc, &highpc, cu, NULL))
13879 case PC_BOUNDS_NOT_PRESENT:
13880 /* DW_TAG_lexical_block has no attributes, process its children as if
13881 there was no wrapping by that DW_TAG_lexical_block.
13882 GCC does no longer produces such DWARF since GCC r224161. */
13883 for (child_die = die->child;
13884 child_die != NULL && child_die->tag;
13885 child_die = sibling_die (child_die))
13886 process_die (child_die, cu);
13888 case PC_BOUNDS_INVALID:
13891 lowpc = gdbarch_adjust_dwarf2_addr (gdbarch, lowpc + baseaddr);
13892 highpc = gdbarch_adjust_dwarf2_addr (gdbarch, highpc + baseaddr);
13894 push_context (0, lowpc);
13895 if (die->child != NULL)
13897 child_die = die->child;
13898 while (child_die && child_die->tag)
13900 process_die (child_die, cu);
13901 child_die = sibling_die (child_die);
13904 inherit_abstract_dies (die, cu);
13905 newobj = pop_context ();
13907 if (local_symbols != NULL || local_using_directives != NULL)
13909 struct block *block
13910 = finish_block (0, &local_symbols, newobj->old_blocks, NULL,
13911 newobj->start_addr, highpc);
13913 /* Note that recording ranges after traversing children, as we
13914 do here, means that recording a parent's ranges entails
13915 walking across all its children's ranges as they appear in
13916 the address map, which is quadratic behavior.
13918 It would be nicer to record the parent's ranges before
13919 traversing its children, simply overriding whatever you find
13920 there. But since we don't even decide whether to create a
13921 block until after we've traversed its children, that's hard
13923 dwarf2_record_block_ranges (die, block, baseaddr, cu);
13925 local_symbols = newobj->locals;
13926 local_using_directives = newobj->local_using_directives;
13929 /* Read in DW_TAG_call_site and insert it to CU->call_site_htab. */
13932 read_call_site_scope (struct die_info *die, struct dwarf2_cu *cu)
13934 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
13935 struct gdbarch *gdbarch = get_objfile_arch (objfile);
13936 CORE_ADDR pc, baseaddr;
13937 struct attribute *attr;
13938 struct call_site *call_site, call_site_local;
13941 struct die_info *child_die;
13943 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
13945 attr = dwarf2_attr (die, DW_AT_call_return_pc, cu);
13948 /* This was a pre-DWARF-5 GNU extension alias
13949 for DW_AT_call_return_pc. */
13950 attr = dwarf2_attr (die, DW_AT_low_pc, cu);
13954 complaint (&symfile_complaints,
13955 _("missing DW_AT_call_return_pc for DW_TAG_call_site "
13956 "DIE %s [in module %s]"),
13957 sect_offset_str (die->sect_off), objfile_name (objfile));
13960 pc = attr_value_as_address (attr) + baseaddr;
13961 pc = gdbarch_adjust_dwarf2_addr (gdbarch, pc);
13963 if (cu->call_site_htab == NULL)
13964 cu->call_site_htab = htab_create_alloc_ex (16, core_addr_hash, core_addr_eq,
13965 NULL, &objfile->objfile_obstack,
13966 hashtab_obstack_allocate, NULL);
13967 call_site_local.pc = pc;
13968 slot = htab_find_slot (cu->call_site_htab, &call_site_local, INSERT);
13971 complaint (&symfile_complaints,
13972 _("Duplicate PC %s for DW_TAG_call_site "
13973 "DIE %s [in module %s]"),
13974 paddress (gdbarch, pc), sect_offset_str (die->sect_off),
13975 objfile_name (objfile));
13979 /* Count parameters at the caller. */
13982 for (child_die = die->child; child_die && child_die->tag;
13983 child_die = sibling_die (child_die))
13985 if (child_die->tag != DW_TAG_call_site_parameter
13986 && child_die->tag != DW_TAG_GNU_call_site_parameter)
13988 complaint (&symfile_complaints,
13989 _("Tag %d is not DW_TAG_call_site_parameter in "
13990 "DW_TAG_call_site child DIE %s [in module %s]"),
13991 child_die->tag, sect_offset_str (child_die->sect_off),
13992 objfile_name (objfile));
14000 = ((struct call_site *)
14001 obstack_alloc (&objfile->objfile_obstack,
14002 sizeof (*call_site)
14003 + (sizeof (*call_site->parameter) * (nparams - 1))));
14005 memset (call_site, 0, sizeof (*call_site) - sizeof (*call_site->parameter));
14006 call_site->pc = pc;
14008 if (dwarf2_flag_true_p (die, DW_AT_call_tail_call, cu)
14009 || dwarf2_flag_true_p (die, DW_AT_GNU_tail_call, cu))
14011 struct die_info *func_die;
14013 /* Skip also over DW_TAG_inlined_subroutine. */
14014 for (func_die = die->parent;
14015 func_die && func_die->tag != DW_TAG_subprogram
14016 && func_die->tag != DW_TAG_subroutine_type;
14017 func_die = func_die->parent);
14019 /* DW_AT_call_all_calls is a superset
14020 of DW_AT_call_all_tail_calls. */
14022 && !dwarf2_flag_true_p (func_die, DW_AT_call_all_calls, cu)
14023 && !dwarf2_flag_true_p (func_die, DW_AT_GNU_all_call_sites, cu)
14024 && !dwarf2_flag_true_p (func_die, DW_AT_call_all_tail_calls, cu)
14025 && !dwarf2_flag_true_p (func_die, DW_AT_GNU_all_tail_call_sites, cu))
14027 /* TYPE_TAIL_CALL_LIST is not interesting in functions where it is
14028 not complete. But keep CALL_SITE for look ups via call_site_htab,
14029 both the initial caller containing the real return address PC and
14030 the final callee containing the current PC of a chain of tail
14031 calls do not need to have the tail call list complete. But any
14032 function candidate for a virtual tail call frame searched via
14033 TYPE_TAIL_CALL_LIST must have the tail call list complete to be
14034 determined unambiguously. */
14038 struct type *func_type = NULL;
14041 func_type = get_die_type (func_die, cu);
14042 if (func_type != NULL)
14044 gdb_assert (TYPE_CODE (func_type) == TYPE_CODE_FUNC);
14046 /* Enlist this call site to the function. */
14047 call_site->tail_call_next = TYPE_TAIL_CALL_LIST (func_type);
14048 TYPE_TAIL_CALL_LIST (func_type) = call_site;
14051 complaint (&symfile_complaints,
14052 _("Cannot find function owning DW_TAG_call_site "
14053 "DIE %s [in module %s]"),
14054 sect_offset_str (die->sect_off), objfile_name (objfile));
14058 attr = dwarf2_attr (die, DW_AT_call_target, cu);
14060 attr = dwarf2_attr (die, DW_AT_GNU_call_site_target, cu);
14062 attr = dwarf2_attr (die, DW_AT_call_origin, cu);
14065 /* This was a pre-DWARF-5 GNU extension alias for DW_AT_call_origin. */
14066 attr = dwarf2_attr (die, DW_AT_abstract_origin, cu);
14068 SET_FIELD_DWARF_BLOCK (call_site->target, NULL);
14069 if (!attr || (attr_form_is_block (attr) && DW_BLOCK (attr)->size == 0))
14070 /* Keep NULL DWARF_BLOCK. */;
14071 else if (attr_form_is_block (attr))
14073 struct dwarf2_locexpr_baton *dlbaton;
14075 dlbaton = XOBNEW (&objfile->objfile_obstack, struct dwarf2_locexpr_baton);
14076 dlbaton->data = DW_BLOCK (attr)->data;
14077 dlbaton->size = DW_BLOCK (attr)->size;
14078 dlbaton->per_cu = cu->per_cu;
14080 SET_FIELD_DWARF_BLOCK (call_site->target, dlbaton);
14082 else if (attr_form_is_ref (attr))
14084 struct dwarf2_cu *target_cu = cu;
14085 struct die_info *target_die;
14087 target_die = follow_die_ref (die, attr, &target_cu);
14088 gdb_assert (target_cu->per_cu->dwarf2_per_objfile->objfile == objfile);
14089 if (die_is_declaration (target_die, target_cu))
14091 const char *target_physname;
14093 /* Prefer the mangled name; otherwise compute the demangled one. */
14094 target_physname = dw2_linkage_name (target_die, target_cu);
14095 if (target_physname == NULL)
14096 target_physname = dwarf2_physname (NULL, target_die, target_cu);
14097 if (target_physname == NULL)
14098 complaint (&symfile_complaints,
14099 _("DW_AT_call_target target DIE has invalid "
14100 "physname, for referencing DIE %s [in module %s]"),
14101 sect_offset_str (die->sect_off), objfile_name (objfile));
14103 SET_FIELD_PHYSNAME (call_site->target, target_physname);
14109 /* DW_AT_entry_pc should be preferred. */
14110 if (dwarf2_get_pc_bounds (target_die, &lowpc, NULL, target_cu, NULL)
14111 <= PC_BOUNDS_INVALID)
14112 complaint (&symfile_complaints,
14113 _("DW_AT_call_target target DIE has invalid "
14114 "low pc, for referencing DIE %s [in module %s]"),
14115 sect_offset_str (die->sect_off), objfile_name (objfile));
14118 lowpc = gdbarch_adjust_dwarf2_addr (gdbarch, lowpc + baseaddr);
14119 SET_FIELD_PHYSADDR (call_site->target, lowpc);
14124 complaint (&symfile_complaints,
14125 _("DW_TAG_call_site DW_AT_call_target is neither "
14126 "block nor reference, for DIE %s [in module %s]"),
14127 sect_offset_str (die->sect_off), objfile_name (objfile));
14129 call_site->per_cu = cu->per_cu;
14131 for (child_die = die->child;
14132 child_die && child_die->tag;
14133 child_die = sibling_die (child_die))
14135 struct call_site_parameter *parameter;
14136 struct attribute *loc, *origin;
14138 if (child_die->tag != DW_TAG_call_site_parameter
14139 && child_die->tag != DW_TAG_GNU_call_site_parameter)
14141 /* Already printed the complaint above. */
14145 gdb_assert (call_site->parameter_count < nparams);
14146 parameter = &call_site->parameter[call_site->parameter_count];
14148 /* DW_AT_location specifies the register number or DW_AT_abstract_origin
14149 specifies DW_TAG_formal_parameter. Value of the data assumed for the
14150 register is contained in DW_AT_call_value. */
14152 loc = dwarf2_attr (child_die, DW_AT_location, cu);
14153 origin = dwarf2_attr (child_die, DW_AT_call_parameter, cu);
14154 if (origin == NULL)
14156 /* This was a pre-DWARF-5 GNU extension alias
14157 for DW_AT_call_parameter. */
14158 origin = dwarf2_attr (child_die, DW_AT_abstract_origin, cu);
14160 if (loc == NULL && origin != NULL && attr_form_is_ref (origin))
14162 parameter->kind = CALL_SITE_PARAMETER_PARAM_OFFSET;
14164 sect_offset sect_off
14165 = (sect_offset) dwarf2_get_ref_die_offset (origin);
14166 if (!offset_in_cu_p (&cu->header, sect_off))
14168 /* As DW_OP_GNU_parameter_ref uses CU-relative offset this
14169 binding can be done only inside one CU. Such referenced DIE
14170 therefore cannot be even moved to DW_TAG_partial_unit. */
14171 complaint (&symfile_complaints,
14172 _("DW_AT_call_parameter offset is not in CU for "
14173 "DW_TAG_call_site child DIE %s [in module %s]"),
14174 sect_offset_str (child_die->sect_off),
14175 objfile_name (objfile));
14178 parameter->u.param_cu_off
14179 = (cu_offset) (sect_off - cu->header.sect_off);
14181 else if (loc == NULL || origin != NULL || !attr_form_is_block (loc))
14183 complaint (&symfile_complaints,
14184 _("No DW_FORM_block* DW_AT_location for "
14185 "DW_TAG_call_site child DIE %s [in module %s]"),
14186 sect_offset_str (child_die->sect_off), objfile_name (objfile));
14191 parameter->u.dwarf_reg = dwarf_block_to_dwarf_reg
14192 (DW_BLOCK (loc)->data, &DW_BLOCK (loc)->data[DW_BLOCK (loc)->size]);
14193 if (parameter->u.dwarf_reg != -1)
14194 parameter->kind = CALL_SITE_PARAMETER_DWARF_REG;
14195 else if (dwarf_block_to_sp_offset (gdbarch, DW_BLOCK (loc)->data,
14196 &DW_BLOCK (loc)->data[DW_BLOCK (loc)->size],
14197 ¶meter->u.fb_offset))
14198 parameter->kind = CALL_SITE_PARAMETER_FB_OFFSET;
14201 complaint (&symfile_complaints,
14202 _("Only single DW_OP_reg or DW_OP_fbreg is supported "
14203 "for DW_FORM_block* DW_AT_location is supported for "
14204 "DW_TAG_call_site child DIE %s "
14206 sect_offset_str (child_die->sect_off),
14207 objfile_name (objfile));
14212 attr = dwarf2_attr (child_die, DW_AT_call_value, cu);
14214 attr = dwarf2_attr (child_die, DW_AT_GNU_call_site_value, cu);
14215 if (!attr_form_is_block (attr))
14217 complaint (&symfile_complaints,
14218 _("No DW_FORM_block* DW_AT_call_value for "
14219 "DW_TAG_call_site child DIE %s [in module %s]"),
14220 sect_offset_str (child_die->sect_off),
14221 objfile_name (objfile));
14224 parameter->value = DW_BLOCK (attr)->data;
14225 parameter->value_size = DW_BLOCK (attr)->size;
14227 /* Parameters are not pre-cleared by memset above. */
14228 parameter->data_value = NULL;
14229 parameter->data_value_size = 0;
14230 call_site->parameter_count++;
14232 attr = dwarf2_attr (child_die, DW_AT_call_data_value, cu);
14234 attr = dwarf2_attr (child_die, DW_AT_GNU_call_site_data_value, cu);
14237 if (!attr_form_is_block (attr))
14238 complaint (&symfile_complaints,
14239 _("No DW_FORM_block* DW_AT_call_data_value for "
14240 "DW_TAG_call_site child DIE %s [in module %s]"),
14241 sect_offset_str (child_die->sect_off),
14242 objfile_name (objfile));
14245 parameter->data_value = DW_BLOCK (attr)->data;
14246 parameter->data_value_size = DW_BLOCK (attr)->size;
14252 /* Helper function for read_variable. If DIE represents a virtual
14253 table, then return the type of the concrete object that is
14254 associated with the virtual table. Otherwise, return NULL. */
14256 static struct type *
14257 rust_containing_type (struct die_info *die, struct dwarf2_cu *cu)
14259 struct attribute *attr = dwarf2_attr (die, DW_AT_type, cu);
14263 /* Find the type DIE. */
14264 struct die_info *type_die = NULL;
14265 struct dwarf2_cu *type_cu = cu;
14267 if (attr_form_is_ref (attr))
14268 type_die = follow_die_ref (die, attr, &type_cu);
14269 if (type_die == NULL)
14272 if (dwarf2_attr (type_die, DW_AT_containing_type, type_cu) == NULL)
14274 return die_containing_type (type_die, type_cu);
14277 /* Read a variable (DW_TAG_variable) DIE and create a new symbol. */
14280 read_variable (struct die_info *die, struct dwarf2_cu *cu)
14282 struct rust_vtable_symbol *storage = NULL;
14284 if (cu->language == language_rust)
14286 struct type *containing_type = rust_containing_type (die, cu);
14288 if (containing_type != NULL)
14290 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
14292 storage = OBSTACK_ZALLOC (&objfile->objfile_obstack,
14293 struct rust_vtable_symbol);
14294 initialize_objfile_symbol (storage);
14295 storage->concrete_type = containing_type;
14296 storage->subclass = SYMBOL_RUST_VTABLE;
14300 new_symbol (die, NULL, cu, storage);
14303 /* Call CALLBACK from DW_AT_ranges attribute value OFFSET
14304 reading .debug_rnglists.
14305 Callback's type should be:
14306 void (CORE_ADDR range_beginning, CORE_ADDR range_end)
14307 Return true if the attributes are present and valid, otherwise,
14310 template <typename Callback>
14312 dwarf2_rnglists_process (unsigned offset, struct dwarf2_cu *cu,
14313 Callback &&callback)
14315 struct dwarf2_per_objfile *dwarf2_per_objfile
14316 = cu->per_cu->dwarf2_per_objfile;
14317 struct objfile *objfile = dwarf2_per_objfile->objfile;
14318 bfd *obfd = objfile->obfd;
14319 /* Base address selection entry. */
14322 const gdb_byte *buffer;
14323 CORE_ADDR baseaddr;
14324 bool overflow = false;
14326 found_base = cu->base_known;
14327 base = cu->base_address;
14329 dwarf2_read_section (objfile, &dwarf2_per_objfile->rnglists);
14330 if (offset >= dwarf2_per_objfile->rnglists.size)
14332 complaint (&symfile_complaints,
14333 _("Offset %d out of bounds for DW_AT_ranges attribute"),
14337 buffer = dwarf2_per_objfile->rnglists.buffer + offset;
14339 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
14343 /* Initialize it due to a false compiler warning. */
14344 CORE_ADDR range_beginning = 0, range_end = 0;
14345 const gdb_byte *buf_end = (dwarf2_per_objfile->rnglists.buffer
14346 + dwarf2_per_objfile->rnglists.size);
14347 unsigned int bytes_read;
14349 if (buffer == buf_end)
14354 const auto rlet = static_cast<enum dwarf_range_list_entry>(*buffer++);
14357 case DW_RLE_end_of_list:
14359 case DW_RLE_base_address:
14360 if (buffer + cu->header.addr_size > buf_end)
14365 base = read_address (obfd, buffer, cu, &bytes_read);
14367 buffer += bytes_read;
14369 case DW_RLE_start_length:
14370 if (buffer + cu->header.addr_size > buf_end)
14375 range_beginning = read_address (obfd, buffer, cu, &bytes_read);
14376 buffer += bytes_read;
14377 range_end = (range_beginning
14378 + read_unsigned_leb128 (obfd, buffer, &bytes_read));
14379 buffer += bytes_read;
14380 if (buffer > buf_end)
14386 case DW_RLE_offset_pair:
14387 range_beginning = read_unsigned_leb128 (obfd, buffer, &bytes_read);
14388 buffer += bytes_read;
14389 if (buffer > buf_end)
14394 range_end = read_unsigned_leb128 (obfd, buffer, &bytes_read);
14395 buffer += bytes_read;
14396 if (buffer > buf_end)
14402 case DW_RLE_start_end:
14403 if (buffer + 2 * cu->header.addr_size > buf_end)
14408 range_beginning = read_address (obfd, buffer, cu, &bytes_read);
14409 buffer += bytes_read;
14410 range_end = read_address (obfd, buffer, cu, &bytes_read);
14411 buffer += bytes_read;
14414 complaint (&symfile_complaints,
14415 _("Invalid .debug_rnglists data (no base address)"));
14418 if (rlet == DW_RLE_end_of_list || overflow)
14420 if (rlet == DW_RLE_base_address)
14425 /* We have no valid base address for the ranges
14427 complaint (&symfile_complaints,
14428 _("Invalid .debug_rnglists data (no base address)"));
14432 if (range_beginning > range_end)
14434 /* Inverted range entries are invalid. */
14435 complaint (&symfile_complaints,
14436 _("Invalid .debug_rnglists data (inverted range)"));
14440 /* Empty range entries have no effect. */
14441 if (range_beginning == range_end)
14444 range_beginning += base;
14447 /* A not-uncommon case of bad debug info.
14448 Don't pollute the addrmap with bad data. */
14449 if (range_beginning + baseaddr == 0
14450 && !dwarf2_per_objfile->has_section_at_zero)
14452 complaint (&symfile_complaints,
14453 _(".debug_rnglists entry has start address of zero"
14454 " [in module %s]"), objfile_name (objfile));
14458 callback (range_beginning, range_end);
14463 complaint (&symfile_complaints,
14464 _("Offset %d is not terminated "
14465 "for DW_AT_ranges attribute"),
14473 /* Call CALLBACK from DW_AT_ranges attribute value OFFSET reading .debug_ranges.
14474 Callback's type should be:
14475 void (CORE_ADDR range_beginning, CORE_ADDR range_end)
14476 Return 1 if the attributes are present and valid, otherwise, return 0. */
14478 template <typename Callback>
14480 dwarf2_ranges_process (unsigned offset, struct dwarf2_cu *cu,
14481 Callback &&callback)
14483 struct dwarf2_per_objfile *dwarf2_per_objfile
14484 = cu->per_cu->dwarf2_per_objfile;
14485 struct objfile *objfile = dwarf2_per_objfile->objfile;
14486 struct comp_unit_head *cu_header = &cu->header;
14487 bfd *obfd = objfile->obfd;
14488 unsigned int addr_size = cu_header->addr_size;
14489 CORE_ADDR mask = ~(~(CORE_ADDR)1 << (addr_size * 8 - 1));
14490 /* Base address selection entry. */
14493 unsigned int dummy;
14494 const gdb_byte *buffer;
14495 CORE_ADDR baseaddr;
14497 if (cu_header->version >= 5)
14498 return dwarf2_rnglists_process (offset, cu, callback);
14500 found_base = cu->base_known;
14501 base = cu->base_address;
14503 dwarf2_read_section (objfile, &dwarf2_per_objfile->ranges);
14504 if (offset >= dwarf2_per_objfile->ranges.size)
14506 complaint (&symfile_complaints,
14507 _("Offset %d out of bounds for DW_AT_ranges attribute"),
14511 buffer = dwarf2_per_objfile->ranges.buffer + offset;
14513 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
14517 CORE_ADDR range_beginning, range_end;
14519 range_beginning = read_address (obfd, buffer, cu, &dummy);
14520 buffer += addr_size;
14521 range_end = read_address (obfd, buffer, cu, &dummy);
14522 buffer += addr_size;
14523 offset += 2 * addr_size;
14525 /* An end of list marker is a pair of zero addresses. */
14526 if (range_beginning == 0 && range_end == 0)
14527 /* Found the end of list entry. */
14530 /* Each base address selection entry is a pair of 2 values.
14531 The first is the largest possible address, the second is
14532 the base address. Check for a base address here. */
14533 if ((range_beginning & mask) == mask)
14535 /* If we found the largest possible address, then we already
14536 have the base address in range_end. */
14544 /* We have no valid base address for the ranges
14546 complaint (&symfile_complaints,
14547 _("Invalid .debug_ranges data (no base address)"));
14551 if (range_beginning > range_end)
14553 /* Inverted range entries are invalid. */
14554 complaint (&symfile_complaints,
14555 _("Invalid .debug_ranges data (inverted range)"));
14559 /* Empty range entries have no effect. */
14560 if (range_beginning == range_end)
14563 range_beginning += base;
14566 /* A not-uncommon case of bad debug info.
14567 Don't pollute the addrmap with bad data. */
14568 if (range_beginning + baseaddr == 0
14569 && !dwarf2_per_objfile->has_section_at_zero)
14571 complaint (&symfile_complaints,
14572 _(".debug_ranges entry has start address of zero"
14573 " [in module %s]"), objfile_name (objfile));
14577 callback (range_beginning, range_end);
14583 /* Get low and high pc attributes from DW_AT_ranges attribute value OFFSET.
14584 Return 1 if the attributes are present and valid, otherwise, return 0.
14585 If RANGES_PST is not NULL we should setup `objfile->psymtabs_addrmap'. */
14588 dwarf2_ranges_read (unsigned offset, CORE_ADDR *low_return,
14589 CORE_ADDR *high_return, struct dwarf2_cu *cu,
14590 struct partial_symtab *ranges_pst)
14592 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
14593 struct gdbarch *gdbarch = get_objfile_arch (objfile);
14594 const CORE_ADDR baseaddr = ANOFFSET (objfile->section_offsets,
14595 SECT_OFF_TEXT (objfile));
14598 CORE_ADDR high = 0;
14601 retval = dwarf2_ranges_process (offset, cu,
14602 [&] (CORE_ADDR range_beginning, CORE_ADDR range_end)
14604 if (ranges_pst != NULL)
14609 lowpc = gdbarch_adjust_dwarf2_addr (gdbarch,
14610 range_beginning + baseaddr);
14611 highpc = gdbarch_adjust_dwarf2_addr (gdbarch,
14612 range_end + baseaddr);
14613 addrmap_set_empty (objfile->psymtabs_addrmap, lowpc, highpc - 1,
14617 /* FIXME: This is recording everything as a low-high
14618 segment of consecutive addresses. We should have a
14619 data structure for discontiguous block ranges
14623 low = range_beginning;
14629 if (range_beginning < low)
14630 low = range_beginning;
14631 if (range_end > high)
14639 /* If the first entry is an end-of-list marker, the range
14640 describes an empty scope, i.e. no instructions. */
14646 *high_return = high;
14650 /* Get low and high pc attributes from a die. See enum pc_bounds_kind
14651 definition for the return value. *LOWPC and *HIGHPC are set iff
14652 neither PC_BOUNDS_NOT_PRESENT nor PC_BOUNDS_INVALID are returned. */
14654 static enum pc_bounds_kind
14655 dwarf2_get_pc_bounds (struct die_info *die, CORE_ADDR *lowpc,
14656 CORE_ADDR *highpc, struct dwarf2_cu *cu,
14657 struct partial_symtab *pst)
14659 struct dwarf2_per_objfile *dwarf2_per_objfile
14660 = cu->per_cu->dwarf2_per_objfile;
14661 struct attribute *attr;
14662 struct attribute *attr_high;
14664 CORE_ADDR high = 0;
14665 enum pc_bounds_kind ret;
14667 attr_high = dwarf2_attr (die, DW_AT_high_pc, cu);
14670 attr = dwarf2_attr (die, DW_AT_low_pc, cu);
14673 low = attr_value_as_address (attr);
14674 high = attr_value_as_address (attr_high);
14675 if (cu->header.version >= 4 && attr_form_is_constant (attr_high))
14679 /* Found high w/o low attribute. */
14680 return PC_BOUNDS_INVALID;
14682 /* Found consecutive range of addresses. */
14683 ret = PC_BOUNDS_HIGH_LOW;
14687 attr = dwarf2_attr (die, DW_AT_ranges, cu);
14690 /* DW_AT_ranges_base does not apply to DIEs from the DWO skeleton.
14691 We take advantage of the fact that DW_AT_ranges does not appear
14692 in DW_TAG_compile_unit of DWO files. */
14693 int need_ranges_base = die->tag != DW_TAG_compile_unit;
14694 unsigned int ranges_offset = (DW_UNSND (attr)
14695 + (need_ranges_base
14699 /* Value of the DW_AT_ranges attribute is the offset in the
14700 .debug_ranges section. */
14701 if (!dwarf2_ranges_read (ranges_offset, &low, &high, cu, pst))
14702 return PC_BOUNDS_INVALID;
14703 /* Found discontinuous range of addresses. */
14704 ret = PC_BOUNDS_RANGES;
14707 return PC_BOUNDS_NOT_PRESENT;
14710 /* partial_die_info::read has also the strict LOW < HIGH requirement. */
14712 return PC_BOUNDS_INVALID;
14714 /* When using the GNU linker, .gnu.linkonce. sections are used to
14715 eliminate duplicate copies of functions and vtables and such.
14716 The linker will arbitrarily choose one and discard the others.
14717 The AT_*_pc values for such functions refer to local labels in
14718 these sections. If the section from that file was discarded, the
14719 labels are not in the output, so the relocs get a value of 0.
14720 If this is a discarded function, mark the pc bounds as invalid,
14721 so that GDB will ignore it. */
14722 if (low == 0 && !dwarf2_per_objfile->has_section_at_zero)
14723 return PC_BOUNDS_INVALID;
14731 /* Assuming that DIE represents a subprogram DIE or a lexical block, get
14732 its low and high PC addresses. Do nothing if these addresses could not
14733 be determined. Otherwise, set LOWPC to the low address if it is smaller,
14734 and HIGHPC to the high address if greater than HIGHPC. */
14737 dwarf2_get_subprogram_pc_bounds (struct die_info *die,
14738 CORE_ADDR *lowpc, CORE_ADDR *highpc,
14739 struct dwarf2_cu *cu)
14741 CORE_ADDR low, high;
14742 struct die_info *child = die->child;
14744 if (dwarf2_get_pc_bounds (die, &low, &high, cu, NULL) >= PC_BOUNDS_RANGES)
14746 *lowpc = std::min (*lowpc, low);
14747 *highpc = std::max (*highpc, high);
14750 /* If the language does not allow nested subprograms (either inside
14751 subprograms or lexical blocks), we're done. */
14752 if (cu->language != language_ada)
14755 /* Check all the children of the given DIE. If it contains nested
14756 subprograms, then check their pc bounds. Likewise, we need to
14757 check lexical blocks as well, as they may also contain subprogram
14759 while (child && child->tag)
14761 if (child->tag == DW_TAG_subprogram
14762 || child->tag == DW_TAG_lexical_block)
14763 dwarf2_get_subprogram_pc_bounds (child, lowpc, highpc, cu);
14764 child = sibling_die (child);
14768 /* Get the low and high pc's represented by the scope DIE, and store
14769 them in *LOWPC and *HIGHPC. If the correct values can't be
14770 determined, set *LOWPC to -1 and *HIGHPC to 0. */
14773 get_scope_pc_bounds (struct die_info *die,
14774 CORE_ADDR *lowpc, CORE_ADDR *highpc,
14775 struct dwarf2_cu *cu)
14777 CORE_ADDR best_low = (CORE_ADDR) -1;
14778 CORE_ADDR best_high = (CORE_ADDR) 0;
14779 CORE_ADDR current_low, current_high;
14781 if (dwarf2_get_pc_bounds (die, ¤t_low, ¤t_high, cu, NULL)
14782 >= PC_BOUNDS_RANGES)
14784 best_low = current_low;
14785 best_high = current_high;
14789 struct die_info *child = die->child;
14791 while (child && child->tag)
14793 switch (child->tag) {
14794 case DW_TAG_subprogram:
14795 dwarf2_get_subprogram_pc_bounds (child, &best_low, &best_high, cu);
14797 case DW_TAG_namespace:
14798 case DW_TAG_module:
14799 /* FIXME: carlton/2004-01-16: Should we do this for
14800 DW_TAG_class_type/DW_TAG_structure_type, too? I think
14801 that current GCC's always emit the DIEs corresponding
14802 to definitions of methods of classes as children of a
14803 DW_TAG_compile_unit or DW_TAG_namespace (as opposed to
14804 the DIEs giving the declarations, which could be
14805 anywhere). But I don't see any reason why the
14806 standards says that they have to be there. */
14807 get_scope_pc_bounds (child, ¤t_low, ¤t_high, cu);
14809 if (current_low != ((CORE_ADDR) -1))
14811 best_low = std::min (best_low, current_low);
14812 best_high = std::max (best_high, current_high);
14820 child = sibling_die (child);
14825 *highpc = best_high;
14828 /* Record the address ranges for BLOCK, offset by BASEADDR, as given
14832 dwarf2_record_block_ranges (struct die_info *die, struct block *block,
14833 CORE_ADDR baseaddr, struct dwarf2_cu *cu)
14835 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
14836 struct gdbarch *gdbarch = get_objfile_arch (objfile);
14837 struct attribute *attr;
14838 struct attribute *attr_high;
14840 attr_high = dwarf2_attr (die, DW_AT_high_pc, cu);
14843 attr = dwarf2_attr (die, DW_AT_low_pc, cu);
14846 CORE_ADDR low = attr_value_as_address (attr);
14847 CORE_ADDR high = attr_value_as_address (attr_high);
14849 if (cu->header.version >= 4 && attr_form_is_constant (attr_high))
14852 low = gdbarch_adjust_dwarf2_addr (gdbarch, low + baseaddr);
14853 high = gdbarch_adjust_dwarf2_addr (gdbarch, high + baseaddr);
14854 record_block_range (block, low, high - 1);
14858 attr = dwarf2_attr (die, DW_AT_ranges, cu);
14861 /* DW_AT_ranges_base does not apply to DIEs from the DWO skeleton.
14862 We take advantage of the fact that DW_AT_ranges does not appear
14863 in DW_TAG_compile_unit of DWO files. */
14864 int need_ranges_base = die->tag != DW_TAG_compile_unit;
14866 /* The value of the DW_AT_ranges attribute is the offset of the
14867 address range list in the .debug_ranges section. */
14868 unsigned long offset = (DW_UNSND (attr)
14869 + (need_ranges_base ? cu->ranges_base : 0));
14871 dwarf2_ranges_process (offset, cu,
14872 [&] (CORE_ADDR start, CORE_ADDR end)
14876 start = gdbarch_adjust_dwarf2_addr (gdbarch, start);
14877 end = gdbarch_adjust_dwarf2_addr (gdbarch, end);
14878 record_block_range (block, start, end - 1);
14883 /* Check whether the producer field indicates either of GCC < 4.6, or the
14884 Intel C/C++ compiler, and cache the result in CU. */
14887 check_producer (struct dwarf2_cu *cu)
14891 if (cu->producer == NULL)
14893 /* For unknown compilers expect their behavior is DWARF version
14896 GCC started to support .debug_types sections by -gdwarf-4 since
14897 gcc-4.5.x. As the .debug_types sections are missing DW_AT_producer
14898 for their space efficiency GDB cannot workaround gcc-4.5.x -gdwarf-4
14899 combination. gcc-4.5.x -gdwarf-4 binaries have DW_AT_accessibility
14900 interpreted incorrectly by GDB now - GCC PR debug/48229. */
14902 else if (producer_is_gcc (cu->producer, &major, &minor))
14904 cu->producer_is_gxx_lt_4_6 = major < 4 || (major == 4 && minor < 6);
14905 cu->producer_is_gcc_lt_4_3 = major < 4 || (major == 4 && minor < 3);
14907 else if (producer_is_icc (cu->producer, &major, &minor))
14908 cu->producer_is_icc_lt_14 = major < 14;
14911 /* For other non-GCC compilers, expect their behavior is DWARF version
14915 cu->checked_producer = 1;
14918 /* Check for GCC PR debug/45124 fix which is not present in any G++ version up
14919 to 4.5.any while it is present already in G++ 4.6.0 - the PR has been fixed
14920 during 4.6.0 experimental. */
14923 producer_is_gxx_lt_4_6 (struct dwarf2_cu *cu)
14925 if (!cu->checked_producer)
14926 check_producer (cu);
14928 return cu->producer_is_gxx_lt_4_6;
14931 /* Return the default accessibility type if it is not overriden by
14932 DW_AT_accessibility. */
14934 static enum dwarf_access_attribute
14935 dwarf2_default_access_attribute (struct die_info *die, struct dwarf2_cu *cu)
14937 if (cu->header.version < 3 || producer_is_gxx_lt_4_6 (cu))
14939 /* The default DWARF 2 accessibility for members is public, the default
14940 accessibility for inheritance is private. */
14942 if (die->tag != DW_TAG_inheritance)
14943 return DW_ACCESS_public;
14945 return DW_ACCESS_private;
14949 /* DWARF 3+ defines the default accessibility a different way. The same
14950 rules apply now for DW_TAG_inheritance as for the members and it only
14951 depends on the container kind. */
14953 if (die->parent->tag == DW_TAG_class_type)
14954 return DW_ACCESS_private;
14956 return DW_ACCESS_public;
14960 /* Look for DW_AT_data_member_location. Set *OFFSET to the byte
14961 offset. If the attribute was not found return 0, otherwise return
14962 1. If it was found but could not properly be handled, set *OFFSET
14966 handle_data_member_location (struct die_info *die, struct dwarf2_cu *cu,
14969 struct attribute *attr;
14971 attr = dwarf2_attr (die, DW_AT_data_member_location, cu);
14976 /* Note that we do not check for a section offset first here.
14977 This is because DW_AT_data_member_location is new in DWARF 4,
14978 so if we see it, we can assume that a constant form is really
14979 a constant and not a section offset. */
14980 if (attr_form_is_constant (attr))
14981 *offset = dwarf2_get_attr_constant_value (attr, 0);
14982 else if (attr_form_is_section_offset (attr))
14983 dwarf2_complex_location_expr_complaint ();
14984 else if (attr_form_is_block (attr))
14985 *offset = decode_locdesc (DW_BLOCK (attr), cu);
14987 dwarf2_complex_location_expr_complaint ();
14995 /* Add an aggregate field to the field list. */
14998 dwarf2_add_field (struct field_info *fip, struct die_info *die,
14999 struct dwarf2_cu *cu)
15001 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
15002 struct gdbarch *gdbarch = get_objfile_arch (objfile);
15003 struct nextfield *new_field;
15004 struct attribute *attr;
15006 const char *fieldname = "";
15008 if (die->tag == DW_TAG_inheritance)
15010 fip->baseclasses.emplace_back ();
15011 new_field = &fip->baseclasses.back ();
15015 fip->fields.emplace_back ();
15016 new_field = &fip->fields.back ();
15021 attr = dwarf2_attr (die, DW_AT_accessibility, cu);
15023 new_field->accessibility = DW_UNSND (attr);
15025 new_field->accessibility = dwarf2_default_access_attribute (die, cu);
15026 if (new_field->accessibility != DW_ACCESS_public)
15027 fip->non_public_fields = 1;
15029 attr = dwarf2_attr (die, DW_AT_virtuality, cu);
15031 new_field->virtuality = DW_UNSND (attr);
15033 new_field->virtuality = DW_VIRTUALITY_none;
15035 fp = &new_field->field;
15037 if (die->tag == DW_TAG_member && ! die_is_declaration (die, cu))
15041 /* Data member other than a C++ static data member. */
15043 /* Get type of field. */
15044 fp->type = die_type (die, cu);
15046 SET_FIELD_BITPOS (*fp, 0);
15048 /* Get bit size of field (zero if none). */
15049 attr = dwarf2_attr (die, DW_AT_bit_size, cu);
15052 FIELD_BITSIZE (*fp) = DW_UNSND (attr);
15056 FIELD_BITSIZE (*fp) = 0;
15059 /* Get bit offset of field. */
15060 if (handle_data_member_location (die, cu, &offset))
15061 SET_FIELD_BITPOS (*fp, offset * bits_per_byte);
15062 attr = dwarf2_attr (die, DW_AT_bit_offset, cu);
15065 if (gdbarch_bits_big_endian (gdbarch))
15067 /* For big endian bits, the DW_AT_bit_offset gives the
15068 additional bit offset from the MSB of the containing
15069 anonymous object to the MSB of the field. We don't
15070 have to do anything special since we don't need to
15071 know the size of the anonymous object. */
15072 SET_FIELD_BITPOS (*fp, FIELD_BITPOS (*fp) + DW_UNSND (attr));
15076 /* For little endian bits, compute the bit offset to the
15077 MSB of the anonymous object, subtract off the number of
15078 bits from the MSB of the field to the MSB of the
15079 object, and then subtract off the number of bits of
15080 the field itself. The result is the bit offset of
15081 the LSB of the field. */
15082 int anonymous_size;
15083 int bit_offset = DW_UNSND (attr);
15085 attr = dwarf2_attr (die, DW_AT_byte_size, cu);
15088 /* The size of the anonymous object containing
15089 the bit field is explicit, so use the
15090 indicated size (in bytes). */
15091 anonymous_size = DW_UNSND (attr);
15095 /* The size of the anonymous object containing
15096 the bit field must be inferred from the type
15097 attribute of the data member containing the
15099 anonymous_size = TYPE_LENGTH (fp->type);
15101 SET_FIELD_BITPOS (*fp,
15102 (FIELD_BITPOS (*fp)
15103 + anonymous_size * bits_per_byte
15104 - bit_offset - FIELD_BITSIZE (*fp)));
15107 attr = dwarf2_attr (die, DW_AT_data_bit_offset, cu);
15109 SET_FIELD_BITPOS (*fp, (FIELD_BITPOS (*fp)
15110 + dwarf2_get_attr_constant_value (attr, 0)));
15112 /* Get name of field. */
15113 fieldname = dwarf2_name (die, cu);
15114 if (fieldname == NULL)
15117 /* The name is already allocated along with this objfile, so we don't
15118 need to duplicate it for the type. */
15119 fp->name = fieldname;
15121 /* Change accessibility for artificial fields (e.g. virtual table
15122 pointer or virtual base class pointer) to private. */
15123 if (dwarf2_attr (die, DW_AT_artificial, cu))
15125 FIELD_ARTIFICIAL (*fp) = 1;
15126 new_field->accessibility = DW_ACCESS_private;
15127 fip->non_public_fields = 1;
15130 else if (die->tag == DW_TAG_member || die->tag == DW_TAG_variable)
15132 /* C++ static member. */
15134 /* NOTE: carlton/2002-11-05: It should be a DW_TAG_member that
15135 is a declaration, but all versions of G++ as of this writing
15136 (so through at least 3.2.1) incorrectly generate
15137 DW_TAG_variable tags. */
15139 const char *physname;
15141 /* Get name of field. */
15142 fieldname = dwarf2_name (die, cu);
15143 if (fieldname == NULL)
15146 attr = dwarf2_attr (die, DW_AT_const_value, cu);
15148 /* Only create a symbol if this is an external value.
15149 new_symbol checks this and puts the value in the global symbol
15150 table, which we want. If it is not external, new_symbol
15151 will try to put the value in cu->list_in_scope which is wrong. */
15152 && dwarf2_flag_true_p (die, DW_AT_external, cu))
15154 /* A static const member, not much different than an enum as far as
15155 we're concerned, except that we can support more types. */
15156 new_symbol (die, NULL, cu);
15159 /* Get physical name. */
15160 physname = dwarf2_physname (fieldname, die, cu);
15162 /* The name is already allocated along with this objfile, so we don't
15163 need to duplicate it for the type. */
15164 SET_FIELD_PHYSNAME (*fp, physname ? physname : "");
15165 FIELD_TYPE (*fp) = die_type (die, cu);
15166 FIELD_NAME (*fp) = fieldname;
15168 else if (die->tag == DW_TAG_inheritance)
15172 /* C++ base class field. */
15173 if (handle_data_member_location (die, cu, &offset))
15174 SET_FIELD_BITPOS (*fp, offset * bits_per_byte);
15175 FIELD_BITSIZE (*fp) = 0;
15176 FIELD_TYPE (*fp) = die_type (die, cu);
15177 FIELD_NAME (*fp) = type_name_no_tag (fp->type);
15179 else if (die->tag == DW_TAG_variant_part)
15181 /* process_structure_scope will treat this DIE as a union. */
15182 process_structure_scope (die, cu);
15184 /* The variant part is relative to the start of the enclosing
15186 SET_FIELD_BITPOS (*fp, 0);
15187 fp->type = get_die_type (die, cu);
15188 fp->artificial = 1;
15189 fp->name = "<<variant>>";
15192 gdb_assert_not_reached ("missing case in dwarf2_add_field");
15195 /* Can the type given by DIE define another type? */
15198 type_can_define_types (const struct die_info *die)
15202 case DW_TAG_typedef:
15203 case DW_TAG_class_type:
15204 case DW_TAG_structure_type:
15205 case DW_TAG_union_type:
15206 case DW_TAG_enumeration_type:
15214 /* Add a type definition defined in the scope of the FIP's class. */
15217 dwarf2_add_type_defn (struct field_info *fip, struct die_info *die,
15218 struct dwarf2_cu *cu)
15220 struct decl_field fp;
15221 memset (&fp, 0, sizeof (fp));
15223 gdb_assert (type_can_define_types (die));
15225 /* Get name of field. NULL is okay here, meaning an anonymous type. */
15226 fp.name = dwarf2_name (die, cu);
15227 fp.type = read_type_die (die, cu);
15229 /* Save accessibility. */
15230 enum dwarf_access_attribute accessibility;
15231 struct attribute *attr = dwarf2_attr (die, DW_AT_accessibility, cu);
15233 accessibility = (enum dwarf_access_attribute) DW_UNSND (attr);
15235 accessibility = dwarf2_default_access_attribute (die, cu);
15236 switch (accessibility)
15238 case DW_ACCESS_public:
15239 /* The assumed value if neither private nor protected. */
15241 case DW_ACCESS_private:
15244 case DW_ACCESS_protected:
15245 fp.is_protected = 1;
15248 complaint (&symfile_complaints,
15249 _("Unhandled DW_AT_accessibility value (%x)"), accessibility);
15252 if (die->tag == DW_TAG_typedef)
15253 fip->typedef_field_list.push_back (fp);
15255 fip->nested_types_list.push_back (fp);
15258 /* Create the vector of fields, and attach it to the type. */
15261 dwarf2_attach_fields_to_type (struct field_info *fip, struct type *type,
15262 struct dwarf2_cu *cu)
15264 int nfields = fip->nfields;
15266 /* Record the field count, allocate space for the array of fields,
15267 and create blank accessibility bitfields if necessary. */
15268 TYPE_NFIELDS (type) = nfields;
15269 TYPE_FIELDS (type) = (struct field *)
15270 TYPE_ZALLOC (type, sizeof (struct field) * nfields);
15272 if (fip->non_public_fields && cu->language != language_ada)
15274 ALLOCATE_CPLUS_STRUCT_TYPE (type);
15276 TYPE_FIELD_PRIVATE_BITS (type) =
15277 (B_TYPE *) TYPE_ALLOC (type, B_BYTES (nfields));
15278 B_CLRALL (TYPE_FIELD_PRIVATE_BITS (type), nfields);
15280 TYPE_FIELD_PROTECTED_BITS (type) =
15281 (B_TYPE *) TYPE_ALLOC (type, B_BYTES (nfields));
15282 B_CLRALL (TYPE_FIELD_PROTECTED_BITS (type), nfields);
15284 TYPE_FIELD_IGNORE_BITS (type) =
15285 (B_TYPE *) TYPE_ALLOC (type, B_BYTES (nfields));
15286 B_CLRALL (TYPE_FIELD_IGNORE_BITS (type), nfields);
15289 /* If the type has baseclasses, allocate and clear a bit vector for
15290 TYPE_FIELD_VIRTUAL_BITS. */
15291 if (!fip->baseclasses.empty () && cu->language != language_ada)
15293 int num_bytes = B_BYTES (fip->baseclasses.size ());
15294 unsigned char *pointer;
15296 ALLOCATE_CPLUS_STRUCT_TYPE (type);
15297 pointer = (unsigned char *) TYPE_ALLOC (type, num_bytes);
15298 TYPE_FIELD_VIRTUAL_BITS (type) = pointer;
15299 B_CLRALL (TYPE_FIELD_VIRTUAL_BITS (type), fip->baseclasses.size ());
15300 TYPE_N_BASECLASSES (type) = fip->baseclasses.size ();
15303 if (TYPE_FLAG_DISCRIMINATED_UNION (type))
15305 struct discriminant_info *di = alloc_discriminant_info (type, -1, -1);
15307 for (int index = 0; index < nfields; ++index)
15309 struct nextfield &field = fip->fields[index];
15311 if (field.variant.is_discriminant)
15312 di->discriminant_index = index;
15313 else if (field.variant.default_branch)
15314 di->default_index = index;
15316 di->discriminants[index] = field.variant.discriminant_value;
15320 /* Copy the saved-up fields into the field vector. */
15321 for (int i = 0; i < nfields; ++i)
15323 struct nextfield &field
15324 = ((i < fip->baseclasses.size ()) ? fip->baseclasses[i]
15325 : fip->fields[i - fip->baseclasses.size ()]);
15327 TYPE_FIELD (type, i) = field.field;
15328 switch (field.accessibility)
15330 case DW_ACCESS_private:
15331 if (cu->language != language_ada)
15332 SET_TYPE_FIELD_PRIVATE (type, i);
15335 case DW_ACCESS_protected:
15336 if (cu->language != language_ada)
15337 SET_TYPE_FIELD_PROTECTED (type, i);
15340 case DW_ACCESS_public:
15344 /* Unknown accessibility. Complain and treat it as public. */
15346 complaint (&symfile_complaints, _("unsupported accessibility %d"),
15347 field.accessibility);
15351 if (i < fip->baseclasses.size ())
15353 switch (field.virtuality)
15355 case DW_VIRTUALITY_virtual:
15356 case DW_VIRTUALITY_pure_virtual:
15357 if (cu->language == language_ada)
15358 error (_("unexpected virtuality in component of Ada type"));
15359 SET_TYPE_FIELD_VIRTUAL (type, i);
15366 /* Return true if this member function is a constructor, false
15370 dwarf2_is_constructor (struct die_info *die, struct dwarf2_cu *cu)
15372 const char *fieldname;
15373 const char *type_name;
15376 if (die->parent == NULL)
15379 if (die->parent->tag != DW_TAG_structure_type
15380 && die->parent->tag != DW_TAG_union_type
15381 && die->parent->tag != DW_TAG_class_type)
15384 fieldname = dwarf2_name (die, cu);
15385 type_name = dwarf2_name (die->parent, cu);
15386 if (fieldname == NULL || type_name == NULL)
15389 len = strlen (fieldname);
15390 return (strncmp (fieldname, type_name, len) == 0
15391 && (type_name[len] == '\0' || type_name[len] == '<'));
15394 /* Add a member function to the proper fieldlist. */
15397 dwarf2_add_member_fn (struct field_info *fip, struct die_info *die,
15398 struct type *type, struct dwarf2_cu *cu)
15400 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
15401 struct attribute *attr;
15403 struct fnfieldlist *flp = nullptr;
15404 struct fn_field *fnp;
15405 const char *fieldname;
15406 struct type *this_type;
15407 enum dwarf_access_attribute accessibility;
15409 if (cu->language == language_ada)
15410 error (_("unexpected member function in Ada type"));
15412 /* Get name of member function. */
15413 fieldname = dwarf2_name (die, cu);
15414 if (fieldname == NULL)
15417 /* Look up member function name in fieldlist. */
15418 for (i = 0; i < fip->fnfieldlists.size (); i++)
15420 if (strcmp (fip->fnfieldlists[i].name, fieldname) == 0)
15422 flp = &fip->fnfieldlists[i];
15427 /* Create a new fnfieldlist if necessary. */
15428 if (flp == nullptr)
15430 fip->fnfieldlists.emplace_back ();
15431 flp = &fip->fnfieldlists.back ();
15432 flp->name = fieldname;
15433 i = fip->fnfieldlists.size () - 1;
15436 /* Create a new member function field and add it to the vector of
15438 flp->fnfields.emplace_back ();
15439 fnp = &flp->fnfields.back ();
15441 /* Delay processing of the physname until later. */
15442 if (cu->language == language_cplus)
15443 add_to_method_list (type, i, flp->fnfields.size () - 1, fieldname,
15447 const char *physname = dwarf2_physname (fieldname, die, cu);
15448 fnp->physname = physname ? physname : "";
15451 fnp->type = alloc_type (objfile);
15452 this_type = read_type_die (die, cu);
15453 if (this_type && TYPE_CODE (this_type) == TYPE_CODE_FUNC)
15455 int nparams = TYPE_NFIELDS (this_type);
15457 /* TYPE is the domain of this method, and THIS_TYPE is the type
15458 of the method itself (TYPE_CODE_METHOD). */
15459 smash_to_method_type (fnp->type, type,
15460 TYPE_TARGET_TYPE (this_type),
15461 TYPE_FIELDS (this_type),
15462 TYPE_NFIELDS (this_type),
15463 TYPE_VARARGS (this_type));
15465 /* Handle static member functions.
15466 Dwarf2 has no clean way to discern C++ static and non-static
15467 member functions. G++ helps GDB by marking the first
15468 parameter for non-static member functions (which is the this
15469 pointer) as artificial. We obtain this information from
15470 read_subroutine_type via TYPE_FIELD_ARTIFICIAL. */
15471 if (nparams == 0 || TYPE_FIELD_ARTIFICIAL (this_type, 0) == 0)
15472 fnp->voffset = VOFFSET_STATIC;
15475 complaint (&symfile_complaints, _("member function type missing for '%s'"),
15476 dwarf2_full_name (fieldname, die, cu));
15478 /* Get fcontext from DW_AT_containing_type if present. */
15479 if (dwarf2_attr (die, DW_AT_containing_type, cu) != NULL)
15480 fnp->fcontext = die_containing_type (die, cu);
15482 /* dwarf2 doesn't have stubbed physical names, so the setting of is_const and
15483 is_volatile is irrelevant, as it is needed by gdb_mangle_name only. */
15485 /* Get accessibility. */
15486 attr = dwarf2_attr (die, DW_AT_accessibility, cu);
15488 accessibility = (enum dwarf_access_attribute) DW_UNSND (attr);
15490 accessibility = dwarf2_default_access_attribute (die, cu);
15491 switch (accessibility)
15493 case DW_ACCESS_private:
15494 fnp->is_private = 1;
15496 case DW_ACCESS_protected:
15497 fnp->is_protected = 1;
15501 /* Check for artificial methods. */
15502 attr = dwarf2_attr (die, DW_AT_artificial, cu);
15503 if (attr && DW_UNSND (attr) != 0)
15504 fnp->is_artificial = 1;
15506 fnp->is_constructor = dwarf2_is_constructor (die, cu);
15508 /* Get index in virtual function table if it is a virtual member
15509 function. For older versions of GCC, this is an offset in the
15510 appropriate virtual table, as specified by DW_AT_containing_type.
15511 For everyone else, it is an expression to be evaluated relative
15512 to the object address. */
15514 attr = dwarf2_attr (die, DW_AT_vtable_elem_location, cu);
15517 if (attr_form_is_block (attr) && DW_BLOCK (attr)->size > 0)
15519 if (DW_BLOCK (attr)->data[0] == DW_OP_constu)
15521 /* Old-style GCC. */
15522 fnp->voffset = decode_locdesc (DW_BLOCK (attr), cu) + 2;
15524 else if (DW_BLOCK (attr)->data[0] == DW_OP_deref
15525 || (DW_BLOCK (attr)->size > 1
15526 && DW_BLOCK (attr)->data[0] == DW_OP_deref_size
15527 && DW_BLOCK (attr)->data[1] == cu->header.addr_size))
15529 fnp->voffset = decode_locdesc (DW_BLOCK (attr), cu);
15530 if ((fnp->voffset % cu->header.addr_size) != 0)
15531 dwarf2_complex_location_expr_complaint ();
15533 fnp->voffset /= cu->header.addr_size;
15537 dwarf2_complex_location_expr_complaint ();
15539 if (!fnp->fcontext)
15541 /* If there is no `this' field and no DW_AT_containing_type,
15542 we cannot actually find a base class context for the
15544 if (TYPE_NFIELDS (this_type) == 0
15545 || !TYPE_FIELD_ARTIFICIAL (this_type, 0))
15547 complaint (&symfile_complaints,
15548 _("cannot determine context for virtual member "
15549 "function \"%s\" (offset %s)"),
15550 fieldname, sect_offset_str (die->sect_off));
15555 = TYPE_TARGET_TYPE (TYPE_FIELD_TYPE (this_type, 0));
15559 else if (attr_form_is_section_offset (attr))
15561 dwarf2_complex_location_expr_complaint ();
15565 dwarf2_invalid_attrib_class_complaint ("DW_AT_vtable_elem_location",
15571 attr = dwarf2_attr (die, DW_AT_virtuality, cu);
15572 if (attr && DW_UNSND (attr))
15574 /* GCC does this, as of 2008-08-25; PR debug/37237. */
15575 complaint (&symfile_complaints,
15576 _("Member function \"%s\" (offset %s) is virtual "
15577 "but the vtable offset is not specified"),
15578 fieldname, sect_offset_str (die->sect_off));
15579 ALLOCATE_CPLUS_STRUCT_TYPE (type);
15580 TYPE_CPLUS_DYNAMIC (type) = 1;
15585 /* Create the vector of member function fields, and attach it to the type. */
15588 dwarf2_attach_fn_fields_to_type (struct field_info *fip, struct type *type,
15589 struct dwarf2_cu *cu)
15591 if (cu->language == language_ada)
15592 error (_("unexpected member functions in Ada type"));
15594 ALLOCATE_CPLUS_STRUCT_TYPE (type);
15595 TYPE_FN_FIELDLISTS (type) = (struct fn_fieldlist *)
15597 sizeof (struct fn_fieldlist) * fip->fnfieldlists.size ());
15599 for (int i = 0; i < fip->fnfieldlists.size (); i++)
15601 struct fnfieldlist &nf = fip->fnfieldlists[i];
15602 struct fn_fieldlist *fn_flp = &TYPE_FN_FIELDLIST (type, i);
15604 TYPE_FN_FIELDLIST_NAME (type, i) = nf.name;
15605 TYPE_FN_FIELDLIST_LENGTH (type, i) = nf.fnfields.size ();
15606 fn_flp->fn_fields = (struct fn_field *)
15607 TYPE_ALLOC (type, sizeof (struct fn_field) * nf.fnfields.size ());
15609 for (int k = 0; k < nf.fnfields.size (); ++k)
15610 fn_flp->fn_fields[k] = nf.fnfields[k];
15613 TYPE_NFN_FIELDS (type) = fip->fnfieldlists.size ();
15616 /* Returns non-zero if NAME is the name of a vtable member in CU's
15617 language, zero otherwise. */
15619 is_vtable_name (const char *name, struct dwarf2_cu *cu)
15621 static const char vptr[] = "_vptr";
15623 /* Look for the C++ form of the vtable. */
15624 if (startswith (name, vptr) && is_cplus_marker (name[sizeof (vptr) - 1]))
15630 /* GCC outputs unnamed structures that are really pointers to member
15631 functions, with the ABI-specified layout. If TYPE describes
15632 such a structure, smash it into a member function type.
15634 GCC shouldn't do this; it should just output pointer to member DIEs.
15635 This is GCC PR debug/28767. */
15638 quirk_gcc_member_function_pointer (struct type *type, struct objfile *objfile)
15640 struct type *pfn_type, *self_type, *new_type;
15642 /* Check for a structure with no name and two children. */
15643 if (TYPE_CODE (type) != TYPE_CODE_STRUCT || TYPE_NFIELDS (type) != 2)
15646 /* Check for __pfn and __delta members. */
15647 if (TYPE_FIELD_NAME (type, 0) == NULL
15648 || strcmp (TYPE_FIELD_NAME (type, 0), "__pfn") != 0
15649 || TYPE_FIELD_NAME (type, 1) == NULL
15650 || strcmp (TYPE_FIELD_NAME (type, 1), "__delta") != 0)
15653 /* Find the type of the method. */
15654 pfn_type = TYPE_FIELD_TYPE (type, 0);
15655 if (pfn_type == NULL
15656 || TYPE_CODE (pfn_type) != TYPE_CODE_PTR
15657 || TYPE_CODE (TYPE_TARGET_TYPE (pfn_type)) != TYPE_CODE_FUNC)
15660 /* Look for the "this" argument. */
15661 pfn_type = TYPE_TARGET_TYPE (pfn_type);
15662 if (TYPE_NFIELDS (pfn_type) == 0
15663 /* || TYPE_FIELD_TYPE (pfn_type, 0) == NULL */
15664 || TYPE_CODE (TYPE_FIELD_TYPE (pfn_type, 0)) != TYPE_CODE_PTR)
15667 self_type = TYPE_TARGET_TYPE (TYPE_FIELD_TYPE (pfn_type, 0));
15668 new_type = alloc_type (objfile);
15669 smash_to_method_type (new_type, self_type, TYPE_TARGET_TYPE (pfn_type),
15670 TYPE_FIELDS (pfn_type), TYPE_NFIELDS (pfn_type),
15671 TYPE_VARARGS (pfn_type));
15672 smash_to_methodptr_type (type, new_type);
15676 /* Called when we find the DIE that starts a structure or union scope
15677 (definition) to create a type for the structure or union. Fill in
15678 the type's name and general properties; the members will not be
15679 processed until process_structure_scope. A symbol table entry for
15680 the type will also not be done until process_structure_scope (assuming
15681 the type has a name).
15683 NOTE: we need to call these functions regardless of whether or not the
15684 DIE has a DW_AT_name attribute, since it might be an anonymous
15685 structure or union. This gets the type entered into our set of
15686 user defined types. */
15688 static struct type *
15689 read_structure_type (struct die_info *die, struct dwarf2_cu *cu)
15691 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
15693 struct attribute *attr;
15696 /* If the definition of this type lives in .debug_types, read that type.
15697 Don't follow DW_AT_specification though, that will take us back up
15698 the chain and we want to go down. */
15699 attr = dwarf2_attr_no_follow (die, DW_AT_signature);
15702 type = get_DW_AT_signature_type (die, attr, cu);
15704 /* The type's CU may not be the same as CU.
15705 Ensure TYPE is recorded with CU in die_type_hash. */
15706 return set_die_type (die, type, cu);
15709 type = alloc_type (objfile);
15710 INIT_CPLUS_SPECIFIC (type);
15712 name = dwarf2_name (die, cu);
15715 if (cu->language == language_cplus
15716 || cu->language == language_d
15717 || cu->language == language_rust)
15719 const char *full_name = dwarf2_full_name (name, die, cu);
15721 /* dwarf2_full_name might have already finished building the DIE's
15722 type. If so, there is no need to continue. */
15723 if (get_die_type (die, cu) != NULL)
15724 return get_die_type (die, cu);
15726 TYPE_TAG_NAME (type) = full_name;
15727 if (die->tag == DW_TAG_structure_type
15728 || die->tag == DW_TAG_class_type)
15729 TYPE_NAME (type) = TYPE_TAG_NAME (type);
15733 /* The name is already allocated along with this objfile, so
15734 we don't need to duplicate it for the type. */
15735 TYPE_TAG_NAME (type) = name;
15736 if (die->tag == DW_TAG_class_type)
15737 TYPE_NAME (type) = TYPE_TAG_NAME (type);
15741 if (die->tag == DW_TAG_structure_type)
15743 TYPE_CODE (type) = TYPE_CODE_STRUCT;
15745 else if (die->tag == DW_TAG_union_type)
15747 TYPE_CODE (type) = TYPE_CODE_UNION;
15749 else if (die->tag == DW_TAG_variant_part)
15751 TYPE_CODE (type) = TYPE_CODE_UNION;
15752 TYPE_FLAG_DISCRIMINATED_UNION (type) = 1;
15756 TYPE_CODE (type) = TYPE_CODE_STRUCT;
15759 if (cu->language == language_cplus && die->tag == DW_TAG_class_type)
15760 TYPE_DECLARED_CLASS (type) = 1;
15762 attr = dwarf2_attr (die, DW_AT_byte_size, cu);
15765 if (attr_form_is_constant (attr))
15766 TYPE_LENGTH (type) = DW_UNSND (attr);
15769 /* For the moment, dynamic type sizes are not supported
15770 by GDB's struct type. The actual size is determined
15771 on-demand when resolving the type of a given object,
15772 so set the type's length to zero for now. Otherwise,
15773 we record an expression as the length, and that expression
15774 could lead to a very large value, which could eventually
15775 lead to us trying to allocate that much memory when creating
15776 a value of that type. */
15777 TYPE_LENGTH (type) = 0;
15782 TYPE_LENGTH (type) = 0;
15785 if (producer_is_icc_lt_14 (cu) && (TYPE_LENGTH (type) == 0))
15787 /* ICC<14 does not output the required DW_AT_declaration on
15788 incomplete types, but gives them a size of zero. */
15789 TYPE_STUB (type) = 1;
15792 TYPE_STUB_SUPPORTED (type) = 1;
15794 if (die_is_declaration (die, cu))
15795 TYPE_STUB (type) = 1;
15796 else if (attr == NULL && die->child == NULL
15797 && producer_is_realview (cu->producer))
15798 /* RealView does not output the required DW_AT_declaration
15799 on incomplete types. */
15800 TYPE_STUB (type) = 1;
15802 /* We need to add the type field to the die immediately so we don't
15803 infinitely recurse when dealing with pointers to the structure
15804 type within the structure itself. */
15805 set_die_type (die, type, cu);
15807 /* set_die_type should be already done. */
15808 set_descriptive_type (type, die, cu);
15813 /* A helper for process_structure_scope that handles a single member
15817 handle_struct_member_die (struct die_info *child_die, struct type *type,
15818 struct field_info *fi,
15819 std::vector<struct symbol *> *template_args,
15820 struct dwarf2_cu *cu)
15822 if (child_die->tag == DW_TAG_member
15823 || child_die->tag == DW_TAG_variable
15824 || child_die->tag == DW_TAG_variant_part)
15826 /* NOTE: carlton/2002-11-05: A C++ static data member
15827 should be a DW_TAG_member that is a declaration, but
15828 all versions of G++ as of this writing (so through at
15829 least 3.2.1) incorrectly generate DW_TAG_variable
15830 tags for them instead. */
15831 dwarf2_add_field (fi, child_die, cu);
15833 else if (child_die->tag == DW_TAG_subprogram)
15835 /* Rust doesn't have member functions in the C++ sense.
15836 However, it does emit ordinary functions as children
15837 of a struct DIE. */
15838 if (cu->language == language_rust)
15839 read_func_scope (child_die, cu);
15842 /* C++ member function. */
15843 dwarf2_add_member_fn (fi, child_die, type, cu);
15846 else if (child_die->tag == DW_TAG_inheritance)
15848 /* C++ base class field. */
15849 dwarf2_add_field (fi, child_die, cu);
15851 else if (type_can_define_types (child_die))
15852 dwarf2_add_type_defn (fi, child_die, cu);
15853 else if (child_die->tag == DW_TAG_template_type_param
15854 || child_die->tag == DW_TAG_template_value_param)
15856 struct symbol *arg = new_symbol (child_die, NULL, cu);
15859 template_args->push_back (arg);
15861 else if (child_die->tag == DW_TAG_variant)
15863 /* In a variant we want to get the discriminant and also add a
15864 field for our sole member child. */
15865 struct attribute *discr = dwarf2_attr (child_die, DW_AT_discr_value, cu);
15867 for (struct die_info *variant_child = child_die->child;
15868 variant_child != NULL;
15869 variant_child = sibling_die (variant_child))
15871 if (variant_child->tag == DW_TAG_member)
15873 handle_struct_member_die (variant_child, type, fi,
15874 template_args, cu);
15875 /* Only handle the one. */
15880 /* We don't handle this but we might as well report it if we see
15882 if (dwarf2_attr (child_die, DW_AT_discr_list, cu) != nullptr)
15883 complaint (&symfile_complaints,
15884 _("DW_AT_discr_list is not supported yet"
15885 " - DIE at %s [in module %s]"),
15886 sect_offset_str (child_die->sect_off),
15887 objfile_name (cu->per_cu->dwarf2_per_objfile->objfile));
15889 /* The first field was just added, so we can stash the
15890 discriminant there. */
15891 gdb_assert (!fi->fields.empty ());
15893 fi->fields.back ().variant.default_branch = true;
15895 fi->fields.back ().variant.discriminant_value = DW_UNSND (discr);
15899 /* Finish creating a structure or union type, including filling in
15900 its members and creating a symbol for it. */
15903 process_structure_scope (struct die_info *die, struct dwarf2_cu *cu)
15905 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
15906 struct die_info *child_die;
15909 type = get_die_type (die, cu);
15911 type = read_structure_type (die, cu);
15913 /* When reading a DW_TAG_variant_part, we need to notice when we
15914 read the discriminant member, so we can record it later in the
15915 discriminant_info. */
15916 bool is_variant_part = TYPE_FLAG_DISCRIMINATED_UNION (type);
15917 sect_offset discr_offset;
15919 if (is_variant_part)
15921 struct attribute *discr = dwarf2_attr (die, DW_AT_discr, cu);
15924 /* Maybe it's a univariant form, an extension we support.
15925 In this case arrange not to check the offset. */
15926 is_variant_part = false;
15928 else if (attr_form_is_ref (discr))
15930 struct dwarf2_cu *target_cu = cu;
15931 struct die_info *target_die = follow_die_ref (die, discr, &target_cu);
15933 discr_offset = target_die->sect_off;
15937 complaint (&symfile_complaints,
15938 _("DW_AT_discr does not have DIE reference form"
15939 " - DIE at %s [in module %s]"),
15940 sect_offset_str (die->sect_off),
15941 objfile_name (cu->per_cu->dwarf2_per_objfile->objfile));
15942 is_variant_part = false;
15946 if (die->child != NULL && ! die_is_declaration (die, cu))
15948 struct field_info fi;
15949 std::vector<struct symbol *> template_args;
15951 child_die = die->child;
15953 while (child_die && child_die->tag)
15955 handle_struct_member_die (child_die, type, &fi, &template_args, cu);
15957 if (is_variant_part && discr_offset == child_die->sect_off)
15958 fi.fields.back ().variant.is_discriminant = true;
15960 child_die = sibling_die (child_die);
15963 /* Attach template arguments to type. */
15964 if (!template_args.empty ())
15966 ALLOCATE_CPLUS_STRUCT_TYPE (type);
15967 TYPE_N_TEMPLATE_ARGUMENTS (type) = template_args.size ();
15968 TYPE_TEMPLATE_ARGUMENTS (type)
15969 = XOBNEWVEC (&objfile->objfile_obstack,
15971 TYPE_N_TEMPLATE_ARGUMENTS (type));
15972 memcpy (TYPE_TEMPLATE_ARGUMENTS (type),
15973 template_args.data (),
15974 (TYPE_N_TEMPLATE_ARGUMENTS (type)
15975 * sizeof (struct symbol *)));
15978 /* Attach fields and member functions to the type. */
15980 dwarf2_attach_fields_to_type (&fi, type, cu);
15981 if (!fi.fnfieldlists.empty ())
15983 dwarf2_attach_fn_fields_to_type (&fi, type, cu);
15985 /* Get the type which refers to the base class (possibly this
15986 class itself) which contains the vtable pointer for the current
15987 class from the DW_AT_containing_type attribute. This use of
15988 DW_AT_containing_type is a GNU extension. */
15990 if (dwarf2_attr (die, DW_AT_containing_type, cu) != NULL)
15992 struct type *t = die_containing_type (die, cu);
15994 set_type_vptr_basetype (type, t);
15999 /* Our own class provides vtbl ptr. */
16000 for (i = TYPE_NFIELDS (t) - 1;
16001 i >= TYPE_N_BASECLASSES (t);
16004 const char *fieldname = TYPE_FIELD_NAME (t, i);
16006 if (is_vtable_name (fieldname, cu))
16008 set_type_vptr_fieldno (type, i);
16013 /* Complain if virtual function table field not found. */
16014 if (i < TYPE_N_BASECLASSES (t))
16015 complaint (&symfile_complaints,
16016 _("virtual function table pointer "
16017 "not found when defining class '%s'"),
16018 TYPE_TAG_NAME (type) ? TYPE_TAG_NAME (type) :
16023 set_type_vptr_fieldno (type, TYPE_VPTR_FIELDNO (t));
16026 else if (cu->producer
16027 && startswith (cu->producer, "IBM(R) XL C/C++ Advanced Edition"))
16029 /* The IBM XLC compiler does not provide direct indication
16030 of the containing type, but the vtable pointer is
16031 always named __vfp. */
16035 for (i = TYPE_NFIELDS (type) - 1;
16036 i >= TYPE_N_BASECLASSES (type);
16039 if (strcmp (TYPE_FIELD_NAME (type, i), "__vfp") == 0)
16041 set_type_vptr_fieldno (type, i);
16042 set_type_vptr_basetype (type, type);
16049 /* Copy fi.typedef_field_list linked list elements content into the
16050 allocated array TYPE_TYPEDEF_FIELD_ARRAY (type). */
16051 if (!fi.typedef_field_list.empty ())
16053 int count = fi.typedef_field_list.size ();
16055 ALLOCATE_CPLUS_STRUCT_TYPE (type);
16056 TYPE_TYPEDEF_FIELD_ARRAY (type)
16057 = ((struct decl_field *)
16059 sizeof (TYPE_TYPEDEF_FIELD (type, 0)) * count));
16060 TYPE_TYPEDEF_FIELD_COUNT (type) = count;
16062 for (int i = 0; i < fi.typedef_field_list.size (); ++i)
16063 TYPE_TYPEDEF_FIELD (type, i) = fi.typedef_field_list[i];
16066 /* Copy fi.nested_types_list linked list elements content into the
16067 allocated array TYPE_NESTED_TYPES_ARRAY (type). */
16068 if (!fi.nested_types_list.empty () && cu->language != language_ada)
16070 int count = fi.nested_types_list.size ();
16072 ALLOCATE_CPLUS_STRUCT_TYPE (type);
16073 TYPE_NESTED_TYPES_ARRAY (type)
16074 = ((struct decl_field *)
16075 TYPE_ALLOC (type, sizeof (struct decl_field) * count));
16076 TYPE_NESTED_TYPES_COUNT (type) = count;
16078 for (int i = 0; i < fi.nested_types_list.size (); ++i)
16079 TYPE_NESTED_TYPES_FIELD (type, i) = fi.nested_types_list[i];
16083 quirk_gcc_member_function_pointer (type, objfile);
16084 if (cu->language == language_rust && die->tag == DW_TAG_union_type)
16085 cu->rust_unions.push_back (type);
16087 /* NOTE: carlton/2004-03-16: GCC 3.4 (or at least one of its
16088 snapshots) has been known to create a die giving a declaration
16089 for a class that has, as a child, a die giving a definition for a
16090 nested class. So we have to process our children even if the
16091 current die is a declaration. Normally, of course, a declaration
16092 won't have any children at all. */
16094 child_die = die->child;
16096 while (child_die != NULL && child_die->tag)
16098 if (child_die->tag == DW_TAG_member
16099 || child_die->tag == DW_TAG_variable
16100 || child_die->tag == DW_TAG_inheritance
16101 || child_die->tag == DW_TAG_template_value_param
16102 || child_die->tag == DW_TAG_template_type_param)
16107 process_die (child_die, cu);
16109 child_die = sibling_die (child_die);
16112 /* Do not consider external references. According to the DWARF standard,
16113 these DIEs are identified by the fact that they have no byte_size
16114 attribute, and a declaration attribute. */
16115 if (dwarf2_attr (die, DW_AT_byte_size, cu) != NULL
16116 || !die_is_declaration (die, cu))
16117 new_symbol (die, type, cu);
16120 /* Assuming DIE is an enumeration type, and TYPE is its associated type,
16121 update TYPE using some information only available in DIE's children. */
16124 update_enumeration_type_from_children (struct die_info *die,
16126 struct dwarf2_cu *cu)
16128 struct die_info *child_die;
16129 int unsigned_enum = 1;
16133 auto_obstack obstack;
16135 for (child_die = die->child;
16136 child_die != NULL && child_die->tag;
16137 child_die = sibling_die (child_die))
16139 struct attribute *attr;
16141 const gdb_byte *bytes;
16142 struct dwarf2_locexpr_baton *baton;
16145 if (child_die->tag != DW_TAG_enumerator)
16148 attr = dwarf2_attr (child_die, DW_AT_const_value, cu);
16152 name = dwarf2_name (child_die, cu);
16154 name = "<anonymous enumerator>";
16156 dwarf2_const_value_attr (attr, type, name, &obstack, cu,
16157 &value, &bytes, &baton);
16163 else if ((mask & value) != 0)
16168 /* If we already know that the enum type is neither unsigned, nor
16169 a flag type, no need to look at the rest of the enumerates. */
16170 if (!unsigned_enum && !flag_enum)
16175 TYPE_UNSIGNED (type) = 1;
16177 TYPE_FLAG_ENUM (type) = 1;
16180 /* Given a DW_AT_enumeration_type die, set its type. We do not
16181 complete the type's fields yet, or create any symbols. */
16183 static struct type *
16184 read_enumeration_type (struct die_info *die, struct dwarf2_cu *cu)
16186 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
16188 struct attribute *attr;
16191 /* If the definition of this type lives in .debug_types, read that type.
16192 Don't follow DW_AT_specification though, that will take us back up
16193 the chain and we want to go down. */
16194 attr = dwarf2_attr_no_follow (die, DW_AT_signature);
16197 type = get_DW_AT_signature_type (die, attr, cu);
16199 /* The type's CU may not be the same as CU.
16200 Ensure TYPE is recorded with CU in die_type_hash. */
16201 return set_die_type (die, type, cu);
16204 type = alloc_type (objfile);
16206 TYPE_CODE (type) = TYPE_CODE_ENUM;
16207 name = dwarf2_full_name (NULL, die, cu);
16209 TYPE_TAG_NAME (type) = name;
16211 attr = dwarf2_attr (die, DW_AT_type, cu);
16214 struct type *underlying_type = die_type (die, cu);
16216 TYPE_TARGET_TYPE (type) = underlying_type;
16219 attr = dwarf2_attr (die, DW_AT_byte_size, cu);
16222 TYPE_LENGTH (type) = DW_UNSND (attr);
16226 TYPE_LENGTH (type) = 0;
16229 /* The enumeration DIE can be incomplete. In Ada, any type can be
16230 declared as private in the package spec, and then defined only
16231 inside the package body. Such types are known as Taft Amendment
16232 Types. When another package uses such a type, an incomplete DIE
16233 may be generated by the compiler. */
16234 if (die_is_declaration (die, cu))
16235 TYPE_STUB (type) = 1;
16237 /* Finish the creation of this type by using the enum's children.
16238 We must call this even when the underlying type has been provided
16239 so that we can determine if we're looking at a "flag" enum. */
16240 update_enumeration_type_from_children (die, type, cu);
16242 /* If this type has an underlying type that is not a stub, then we
16243 may use its attributes. We always use the "unsigned" attribute
16244 in this situation, because ordinarily we guess whether the type
16245 is unsigned -- but the guess can be wrong and the underlying type
16246 can tell us the reality. However, we defer to a local size
16247 attribute if one exists, because this lets the compiler override
16248 the underlying type if needed. */
16249 if (TYPE_TARGET_TYPE (type) != NULL && !TYPE_STUB (TYPE_TARGET_TYPE (type)))
16251 TYPE_UNSIGNED (type) = TYPE_UNSIGNED (TYPE_TARGET_TYPE (type));
16252 if (TYPE_LENGTH (type) == 0)
16253 TYPE_LENGTH (type) = TYPE_LENGTH (TYPE_TARGET_TYPE (type));
16256 TYPE_DECLARED_CLASS (type) = dwarf2_flag_true_p (die, DW_AT_enum_class, cu);
16258 return set_die_type (die, type, cu);
16261 /* Given a pointer to a die which begins an enumeration, process all
16262 the dies that define the members of the enumeration, and create the
16263 symbol for the enumeration type.
16265 NOTE: We reverse the order of the element list. */
16268 process_enumeration_scope (struct die_info *die, struct dwarf2_cu *cu)
16270 struct type *this_type;
16272 this_type = get_die_type (die, cu);
16273 if (this_type == NULL)
16274 this_type = read_enumeration_type (die, cu);
16276 if (die->child != NULL)
16278 struct die_info *child_die;
16279 struct symbol *sym;
16280 struct field *fields = NULL;
16281 int num_fields = 0;
16284 child_die = die->child;
16285 while (child_die && child_die->tag)
16287 if (child_die->tag != DW_TAG_enumerator)
16289 process_die (child_die, cu);
16293 name = dwarf2_name (child_die, cu);
16296 sym = new_symbol (child_die, this_type, cu);
16298 if ((num_fields % DW_FIELD_ALLOC_CHUNK) == 0)
16300 fields = (struct field *)
16302 (num_fields + DW_FIELD_ALLOC_CHUNK)
16303 * sizeof (struct field));
16306 FIELD_NAME (fields[num_fields]) = SYMBOL_LINKAGE_NAME (sym);
16307 FIELD_TYPE (fields[num_fields]) = NULL;
16308 SET_FIELD_ENUMVAL (fields[num_fields], SYMBOL_VALUE (sym));
16309 FIELD_BITSIZE (fields[num_fields]) = 0;
16315 child_die = sibling_die (child_die);
16320 TYPE_NFIELDS (this_type) = num_fields;
16321 TYPE_FIELDS (this_type) = (struct field *)
16322 TYPE_ALLOC (this_type, sizeof (struct field) * num_fields);
16323 memcpy (TYPE_FIELDS (this_type), fields,
16324 sizeof (struct field) * num_fields);
16329 /* If we are reading an enum from a .debug_types unit, and the enum
16330 is a declaration, and the enum is not the signatured type in the
16331 unit, then we do not want to add a symbol for it. Adding a
16332 symbol would in some cases obscure the true definition of the
16333 enum, giving users an incomplete type when the definition is
16334 actually available. Note that we do not want to do this for all
16335 enums which are just declarations, because C++0x allows forward
16336 enum declarations. */
16337 if (cu->per_cu->is_debug_types
16338 && die_is_declaration (die, cu))
16340 struct signatured_type *sig_type;
16342 sig_type = (struct signatured_type *) cu->per_cu;
16343 gdb_assert (to_underlying (sig_type->type_offset_in_section) != 0);
16344 if (sig_type->type_offset_in_section != die->sect_off)
16348 new_symbol (die, this_type, cu);
16351 /* Extract all information from a DW_TAG_array_type DIE and put it in
16352 the DIE's type field. For now, this only handles one dimensional
16355 static struct type *
16356 read_array_type (struct die_info *die, struct dwarf2_cu *cu)
16358 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
16359 struct die_info *child_die;
16361 struct type *element_type, *range_type, *index_type;
16362 struct attribute *attr;
16364 struct dynamic_prop *byte_stride_prop = NULL;
16365 unsigned int bit_stride = 0;
16367 element_type = die_type (die, cu);
16369 /* The die_type call above may have already set the type for this DIE. */
16370 type = get_die_type (die, cu);
16374 attr = dwarf2_attr (die, DW_AT_byte_stride, cu);
16380 = (struct dynamic_prop *) alloca (sizeof (struct dynamic_prop));
16381 stride_ok = attr_to_dynamic_prop (attr, die, cu, byte_stride_prop);
16384 complaint (&symfile_complaints,
16385 _("unable to read array DW_AT_byte_stride "
16386 " - DIE at %s [in module %s]"),
16387 sect_offset_str (die->sect_off),
16388 objfile_name (cu->per_cu->dwarf2_per_objfile->objfile));
16389 /* Ignore this attribute. We will likely not be able to print
16390 arrays of this type correctly, but there is little we can do
16391 to help if we cannot read the attribute's value. */
16392 byte_stride_prop = NULL;
16396 attr = dwarf2_attr (die, DW_AT_bit_stride, cu);
16398 bit_stride = DW_UNSND (attr);
16400 /* Irix 6.2 native cc creates array types without children for
16401 arrays with unspecified length. */
16402 if (die->child == NULL)
16404 index_type = objfile_type (objfile)->builtin_int;
16405 range_type = create_static_range_type (NULL, index_type, 0, -1);
16406 type = create_array_type_with_stride (NULL, element_type, range_type,
16407 byte_stride_prop, bit_stride);
16408 return set_die_type (die, type, cu);
16411 std::vector<struct type *> range_types;
16412 child_die = die->child;
16413 while (child_die && child_die->tag)
16415 if (child_die->tag == DW_TAG_subrange_type)
16417 struct type *child_type = read_type_die (child_die, cu);
16419 if (child_type != NULL)
16421 /* The range type was succesfully read. Save it for the
16422 array type creation. */
16423 range_types.push_back (child_type);
16426 child_die = sibling_die (child_die);
16429 /* Dwarf2 dimensions are output from left to right, create the
16430 necessary array types in backwards order. */
16432 type = element_type;
16434 if (read_array_order (die, cu) == DW_ORD_col_major)
16438 while (i < range_types.size ())
16439 type = create_array_type_with_stride (NULL, type, range_types[i++],
16440 byte_stride_prop, bit_stride);
16444 size_t ndim = range_types.size ();
16446 type = create_array_type_with_stride (NULL, type, range_types[ndim],
16447 byte_stride_prop, bit_stride);
16450 /* Understand Dwarf2 support for vector types (like they occur on
16451 the PowerPC w/ AltiVec). Gcc just adds another attribute to the
16452 array type. This is not part of the Dwarf2/3 standard yet, but a
16453 custom vendor extension. The main difference between a regular
16454 array and the vector variant is that vectors are passed by value
16456 attr = dwarf2_attr (die, DW_AT_GNU_vector, cu);
16458 make_vector_type (type);
16460 /* The DIE may have DW_AT_byte_size set. For example an OpenCL
16461 implementation may choose to implement triple vectors using this
16463 attr = dwarf2_attr (die, DW_AT_byte_size, cu);
16466 if (DW_UNSND (attr) >= TYPE_LENGTH (type))
16467 TYPE_LENGTH (type) = DW_UNSND (attr);
16469 complaint (&symfile_complaints,
16470 _("DW_AT_byte_size for array type smaller "
16471 "than the total size of elements"));
16474 name = dwarf2_name (die, cu);
16476 TYPE_NAME (type) = name;
16478 /* Install the type in the die. */
16479 set_die_type (die, type, cu);
16481 /* set_die_type should be already done. */
16482 set_descriptive_type (type, die, cu);
16487 static enum dwarf_array_dim_ordering
16488 read_array_order (struct die_info *die, struct dwarf2_cu *cu)
16490 struct attribute *attr;
16492 attr = dwarf2_attr (die, DW_AT_ordering, cu);
16495 return (enum dwarf_array_dim_ordering) DW_SND (attr);
16497 /* GNU F77 is a special case, as at 08/2004 array type info is the
16498 opposite order to the dwarf2 specification, but data is still
16499 laid out as per normal fortran.
16501 FIXME: dsl/2004-8-20: If G77 is ever fixed, this will also need
16502 version checking. */
16504 if (cu->language == language_fortran
16505 && cu->producer && strstr (cu->producer, "GNU F77"))
16507 return DW_ORD_row_major;
16510 switch (cu->language_defn->la_array_ordering)
16512 case array_column_major:
16513 return DW_ORD_col_major;
16514 case array_row_major:
16516 return DW_ORD_row_major;
16520 /* Extract all information from a DW_TAG_set_type DIE and put it in
16521 the DIE's type field. */
16523 static struct type *
16524 read_set_type (struct die_info *die, struct dwarf2_cu *cu)
16526 struct type *domain_type, *set_type;
16527 struct attribute *attr;
16529 domain_type = die_type (die, cu);
16531 /* The die_type call above may have already set the type for this DIE. */
16532 set_type = get_die_type (die, cu);
16536 set_type = create_set_type (NULL, domain_type);
16538 attr = dwarf2_attr (die, DW_AT_byte_size, cu);
16540 TYPE_LENGTH (set_type) = DW_UNSND (attr);
16542 return set_die_type (die, set_type, cu);
16545 /* A helper for read_common_block that creates a locexpr baton.
16546 SYM is the symbol which we are marking as computed.
16547 COMMON_DIE is the DIE for the common block.
16548 COMMON_LOC is the location expression attribute for the common
16550 MEMBER_LOC is the location expression attribute for the particular
16551 member of the common block that we are processing.
16552 CU is the CU from which the above come. */
16555 mark_common_block_symbol_computed (struct symbol *sym,
16556 struct die_info *common_die,
16557 struct attribute *common_loc,
16558 struct attribute *member_loc,
16559 struct dwarf2_cu *cu)
16561 struct dwarf2_per_objfile *dwarf2_per_objfile
16562 = cu->per_cu->dwarf2_per_objfile;
16563 struct objfile *objfile = dwarf2_per_objfile->objfile;
16564 struct dwarf2_locexpr_baton *baton;
16566 unsigned int cu_off;
16567 enum bfd_endian byte_order = gdbarch_byte_order (get_objfile_arch (objfile));
16568 LONGEST offset = 0;
16570 gdb_assert (common_loc && member_loc);
16571 gdb_assert (attr_form_is_block (common_loc));
16572 gdb_assert (attr_form_is_block (member_loc)
16573 || attr_form_is_constant (member_loc));
16575 baton = XOBNEW (&objfile->objfile_obstack, struct dwarf2_locexpr_baton);
16576 baton->per_cu = cu->per_cu;
16577 gdb_assert (baton->per_cu);
16579 baton->size = 5 /* DW_OP_call4 */ + 1 /* DW_OP_plus */;
16581 if (attr_form_is_constant (member_loc))
16583 offset = dwarf2_get_attr_constant_value (member_loc, 0);
16584 baton->size += 1 /* DW_OP_addr */ + cu->header.addr_size;
16587 baton->size += DW_BLOCK (member_loc)->size;
16589 ptr = (gdb_byte *) obstack_alloc (&objfile->objfile_obstack, baton->size);
16592 *ptr++ = DW_OP_call4;
16593 cu_off = common_die->sect_off - cu->per_cu->sect_off;
16594 store_unsigned_integer (ptr, 4, byte_order, cu_off);
16597 if (attr_form_is_constant (member_loc))
16599 *ptr++ = DW_OP_addr;
16600 store_unsigned_integer (ptr, cu->header.addr_size, byte_order, offset);
16601 ptr += cu->header.addr_size;
16605 /* We have to copy the data here, because DW_OP_call4 will only
16606 use a DW_AT_location attribute. */
16607 memcpy (ptr, DW_BLOCK (member_loc)->data, DW_BLOCK (member_loc)->size);
16608 ptr += DW_BLOCK (member_loc)->size;
16611 *ptr++ = DW_OP_plus;
16612 gdb_assert (ptr - baton->data == baton->size);
16614 SYMBOL_LOCATION_BATON (sym) = baton;
16615 SYMBOL_ACLASS_INDEX (sym) = dwarf2_locexpr_index;
16618 /* Create appropriate locally-scoped variables for all the
16619 DW_TAG_common_block entries. Also create a struct common_block
16620 listing all such variables for `info common'. COMMON_BLOCK_DOMAIN
16621 is used to sepate the common blocks name namespace from regular
16625 read_common_block (struct die_info *die, struct dwarf2_cu *cu)
16627 struct attribute *attr;
16629 attr = dwarf2_attr (die, DW_AT_location, cu);
16632 /* Support the .debug_loc offsets. */
16633 if (attr_form_is_block (attr))
16637 else if (attr_form_is_section_offset (attr))
16639 dwarf2_complex_location_expr_complaint ();
16644 dwarf2_invalid_attrib_class_complaint ("DW_AT_location",
16645 "common block member");
16650 if (die->child != NULL)
16652 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
16653 struct die_info *child_die;
16654 size_t n_entries = 0, size;
16655 struct common_block *common_block;
16656 struct symbol *sym;
16658 for (child_die = die->child;
16659 child_die && child_die->tag;
16660 child_die = sibling_die (child_die))
16663 size = (sizeof (struct common_block)
16664 + (n_entries - 1) * sizeof (struct symbol *));
16666 = (struct common_block *) obstack_alloc (&objfile->objfile_obstack,
16668 memset (common_block->contents, 0, n_entries * sizeof (struct symbol *));
16669 common_block->n_entries = 0;
16671 for (child_die = die->child;
16672 child_die && child_die->tag;
16673 child_die = sibling_die (child_die))
16675 /* Create the symbol in the DW_TAG_common_block block in the current
16677 sym = new_symbol (child_die, NULL, cu);
16680 struct attribute *member_loc;
16682 common_block->contents[common_block->n_entries++] = sym;
16684 member_loc = dwarf2_attr (child_die, DW_AT_data_member_location,
16688 /* GDB has handled this for a long time, but it is
16689 not specified by DWARF. It seems to have been
16690 emitted by gfortran at least as recently as:
16691 http://gcc.gnu.org/bugzilla/show_bug.cgi?id=23057. */
16692 complaint (&symfile_complaints,
16693 _("Variable in common block has "
16694 "DW_AT_data_member_location "
16695 "- DIE at %s [in module %s]"),
16696 sect_offset_str (child_die->sect_off),
16697 objfile_name (objfile));
16699 if (attr_form_is_section_offset (member_loc))
16700 dwarf2_complex_location_expr_complaint ();
16701 else if (attr_form_is_constant (member_loc)
16702 || attr_form_is_block (member_loc))
16705 mark_common_block_symbol_computed (sym, die, attr,
16709 dwarf2_complex_location_expr_complaint ();
16714 sym = new_symbol (die, objfile_type (objfile)->builtin_void, cu);
16715 SYMBOL_VALUE_COMMON_BLOCK (sym) = common_block;
16719 /* Create a type for a C++ namespace. */
16721 static struct type *
16722 read_namespace_type (struct die_info *die, struct dwarf2_cu *cu)
16724 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
16725 const char *previous_prefix, *name;
16729 /* For extensions, reuse the type of the original namespace. */
16730 if (dwarf2_attr (die, DW_AT_extension, cu) != NULL)
16732 struct die_info *ext_die;
16733 struct dwarf2_cu *ext_cu = cu;
16735 ext_die = dwarf2_extension (die, &ext_cu);
16736 type = read_type_die (ext_die, ext_cu);
16738 /* EXT_CU may not be the same as CU.
16739 Ensure TYPE is recorded with CU in die_type_hash. */
16740 return set_die_type (die, type, cu);
16743 name = namespace_name (die, &is_anonymous, cu);
16745 /* Now build the name of the current namespace. */
16747 previous_prefix = determine_prefix (die, cu);
16748 if (previous_prefix[0] != '\0')
16749 name = typename_concat (&objfile->objfile_obstack,
16750 previous_prefix, name, 0, cu);
16752 /* Create the type. */
16753 type = init_type (objfile, TYPE_CODE_NAMESPACE, 0, name);
16754 TYPE_TAG_NAME (type) = TYPE_NAME (type);
16756 return set_die_type (die, type, cu);
16759 /* Read a namespace scope. */
16762 read_namespace (struct die_info *die, struct dwarf2_cu *cu)
16764 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
16767 /* Add a symbol associated to this if we haven't seen the namespace
16768 before. Also, add a using directive if it's an anonymous
16771 if (dwarf2_attr (die, DW_AT_extension, cu) == NULL)
16775 type = read_type_die (die, cu);
16776 new_symbol (die, type, cu);
16778 namespace_name (die, &is_anonymous, cu);
16781 const char *previous_prefix = determine_prefix (die, cu);
16783 std::vector<const char *> excludes;
16784 add_using_directive (using_directives (cu->language),
16785 previous_prefix, TYPE_NAME (type), NULL,
16786 NULL, excludes, 0, &objfile->objfile_obstack);
16790 if (die->child != NULL)
16792 struct die_info *child_die = die->child;
16794 while (child_die && child_die->tag)
16796 process_die (child_die, cu);
16797 child_die = sibling_die (child_die);
16802 /* Read a Fortran module as type. This DIE can be only a declaration used for
16803 imported module. Still we need that type as local Fortran "use ... only"
16804 declaration imports depend on the created type in determine_prefix. */
16806 static struct type *
16807 read_module_type (struct die_info *die, struct dwarf2_cu *cu)
16809 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
16810 const char *module_name;
16813 module_name = dwarf2_name (die, cu);
16815 complaint (&symfile_complaints,
16816 _("DW_TAG_module has no name, offset %s"),
16817 sect_offset_str (die->sect_off));
16818 type = init_type (objfile, TYPE_CODE_MODULE, 0, module_name);
16820 /* determine_prefix uses TYPE_TAG_NAME. */
16821 TYPE_TAG_NAME (type) = TYPE_NAME (type);
16823 return set_die_type (die, type, cu);
16826 /* Read a Fortran module. */
16829 read_module (struct die_info *die, struct dwarf2_cu *cu)
16831 struct die_info *child_die = die->child;
16834 type = read_type_die (die, cu);
16835 new_symbol (die, type, cu);
16837 while (child_die && child_die->tag)
16839 process_die (child_die, cu);
16840 child_die = sibling_die (child_die);
16844 /* Return the name of the namespace represented by DIE. Set
16845 *IS_ANONYMOUS to tell whether or not the namespace is an anonymous
16848 static const char *
16849 namespace_name (struct die_info *die, int *is_anonymous, struct dwarf2_cu *cu)
16851 struct die_info *current_die;
16852 const char *name = NULL;
16854 /* Loop through the extensions until we find a name. */
16856 for (current_die = die;
16857 current_die != NULL;
16858 current_die = dwarf2_extension (die, &cu))
16860 /* We don't use dwarf2_name here so that we can detect the absence
16861 of a name -> anonymous namespace. */
16862 name = dwarf2_string_attr (die, DW_AT_name, cu);
16868 /* Is it an anonymous namespace? */
16870 *is_anonymous = (name == NULL);
16872 name = CP_ANONYMOUS_NAMESPACE_STR;
16877 /* Extract all information from a DW_TAG_pointer_type DIE and add to
16878 the user defined type vector. */
16880 static struct type *
16881 read_tag_pointer_type (struct die_info *die, struct dwarf2_cu *cu)
16883 struct gdbarch *gdbarch
16884 = get_objfile_arch (cu->per_cu->dwarf2_per_objfile->objfile);
16885 struct comp_unit_head *cu_header = &cu->header;
16887 struct attribute *attr_byte_size;
16888 struct attribute *attr_address_class;
16889 int byte_size, addr_class;
16890 struct type *target_type;
16892 target_type = die_type (die, cu);
16894 /* The die_type call above may have already set the type for this DIE. */
16895 type = get_die_type (die, cu);
16899 type = lookup_pointer_type (target_type);
16901 attr_byte_size = dwarf2_attr (die, DW_AT_byte_size, cu);
16902 if (attr_byte_size)
16903 byte_size = DW_UNSND (attr_byte_size);
16905 byte_size = cu_header->addr_size;
16907 attr_address_class = dwarf2_attr (die, DW_AT_address_class, cu);
16908 if (attr_address_class)
16909 addr_class = DW_UNSND (attr_address_class);
16911 addr_class = DW_ADDR_none;
16913 /* If the pointer size or address class is different than the
16914 default, create a type variant marked as such and set the
16915 length accordingly. */
16916 if (TYPE_LENGTH (type) != byte_size || addr_class != DW_ADDR_none)
16918 if (gdbarch_address_class_type_flags_p (gdbarch))
16922 type_flags = gdbarch_address_class_type_flags
16923 (gdbarch, byte_size, addr_class);
16924 gdb_assert ((type_flags & ~TYPE_INSTANCE_FLAG_ADDRESS_CLASS_ALL)
16926 type = make_type_with_address_space (type, type_flags);
16928 else if (TYPE_LENGTH (type) != byte_size)
16930 complaint (&symfile_complaints,
16931 _("invalid pointer size %d"), byte_size);
16935 /* Should we also complain about unhandled address classes? */
16939 TYPE_LENGTH (type) = byte_size;
16940 return set_die_type (die, type, cu);
16943 /* Extract all information from a DW_TAG_ptr_to_member_type DIE and add to
16944 the user defined type vector. */
16946 static struct type *
16947 read_tag_ptr_to_member_type (struct die_info *die, struct dwarf2_cu *cu)
16950 struct type *to_type;
16951 struct type *domain;
16953 to_type = die_type (die, cu);
16954 domain = die_containing_type (die, cu);
16956 /* The calls above may have already set the type for this DIE. */
16957 type = get_die_type (die, cu);
16961 if (TYPE_CODE (check_typedef (to_type)) == TYPE_CODE_METHOD)
16962 type = lookup_methodptr_type (to_type);
16963 else if (TYPE_CODE (check_typedef (to_type)) == TYPE_CODE_FUNC)
16965 struct type *new_type
16966 = alloc_type (cu->per_cu->dwarf2_per_objfile->objfile);
16968 smash_to_method_type (new_type, domain, TYPE_TARGET_TYPE (to_type),
16969 TYPE_FIELDS (to_type), TYPE_NFIELDS (to_type),
16970 TYPE_VARARGS (to_type));
16971 type = lookup_methodptr_type (new_type);
16974 type = lookup_memberptr_type (to_type, domain);
16976 return set_die_type (die, type, cu);
16979 /* Extract all information from a DW_TAG_{rvalue_,}reference_type DIE and add to
16980 the user defined type vector. */
16982 static struct type *
16983 read_tag_reference_type (struct die_info *die, struct dwarf2_cu *cu,
16984 enum type_code refcode)
16986 struct comp_unit_head *cu_header = &cu->header;
16987 struct type *type, *target_type;
16988 struct attribute *attr;
16990 gdb_assert (refcode == TYPE_CODE_REF || refcode == TYPE_CODE_RVALUE_REF);
16992 target_type = die_type (die, cu);
16994 /* The die_type call above may have already set the type for this DIE. */
16995 type = get_die_type (die, cu);
16999 type = lookup_reference_type (target_type, refcode);
17000 attr = dwarf2_attr (die, DW_AT_byte_size, cu);
17003 TYPE_LENGTH (type) = DW_UNSND (attr);
17007 TYPE_LENGTH (type) = cu_header->addr_size;
17009 return set_die_type (die, type, cu);
17012 /* Add the given cv-qualifiers to the element type of the array. GCC
17013 outputs DWARF type qualifiers that apply to an array, not the
17014 element type. But GDB relies on the array element type to carry
17015 the cv-qualifiers. This mimics section 6.7.3 of the C99
17018 static struct type *
17019 add_array_cv_type (struct die_info *die, struct dwarf2_cu *cu,
17020 struct type *base_type, int cnst, int voltl)
17022 struct type *el_type, *inner_array;
17024 base_type = copy_type (base_type);
17025 inner_array = base_type;
17027 while (TYPE_CODE (TYPE_TARGET_TYPE (inner_array)) == TYPE_CODE_ARRAY)
17029 TYPE_TARGET_TYPE (inner_array) =
17030 copy_type (TYPE_TARGET_TYPE (inner_array));
17031 inner_array = TYPE_TARGET_TYPE (inner_array);
17034 el_type = TYPE_TARGET_TYPE (inner_array);
17035 cnst |= TYPE_CONST (el_type);
17036 voltl |= TYPE_VOLATILE (el_type);
17037 TYPE_TARGET_TYPE (inner_array) = make_cv_type (cnst, voltl, el_type, NULL);
17039 return set_die_type (die, base_type, cu);
17042 static struct type *
17043 read_tag_const_type (struct die_info *die, struct dwarf2_cu *cu)
17045 struct type *base_type, *cv_type;
17047 base_type = die_type (die, cu);
17049 /* The die_type call above may have already set the type for this DIE. */
17050 cv_type = get_die_type (die, cu);
17054 /* In case the const qualifier is applied to an array type, the element type
17055 is so qualified, not the array type (section 6.7.3 of C99). */
17056 if (TYPE_CODE (base_type) == TYPE_CODE_ARRAY)
17057 return add_array_cv_type (die, cu, base_type, 1, 0);
17059 cv_type = make_cv_type (1, TYPE_VOLATILE (base_type), base_type, 0);
17060 return set_die_type (die, cv_type, cu);
17063 static struct type *
17064 read_tag_volatile_type (struct die_info *die, struct dwarf2_cu *cu)
17066 struct type *base_type, *cv_type;
17068 base_type = die_type (die, cu);
17070 /* The die_type call above may have already set the type for this DIE. */
17071 cv_type = get_die_type (die, cu);
17075 /* In case the volatile qualifier is applied to an array type, the
17076 element type is so qualified, not the array type (section 6.7.3
17078 if (TYPE_CODE (base_type) == TYPE_CODE_ARRAY)
17079 return add_array_cv_type (die, cu, base_type, 0, 1);
17081 cv_type = make_cv_type (TYPE_CONST (base_type), 1, base_type, 0);
17082 return set_die_type (die, cv_type, cu);
17085 /* Handle DW_TAG_restrict_type. */
17087 static struct type *
17088 read_tag_restrict_type (struct die_info *die, struct dwarf2_cu *cu)
17090 struct type *base_type, *cv_type;
17092 base_type = die_type (die, cu);
17094 /* The die_type call above may have already set the type for this DIE. */
17095 cv_type = get_die_type (die, cu);
17099 cv_type = make_restrict_type (base_type);
17100 return set_die_type (die, cv_type, cu);
17103 /* Handle DW_TAG_atomic_type. */
17105 static struct type *
17106 read_tag_atomic_type (struct die_info *die, struct dwarf2_cu *cu)
17108 struct type *base_type, *cv_type;
17110 base_type = die_type (die, cu);
17112 /* The die_type call above may have already set the type for this DIE. */
17113 cv_type = get_die_type (die, cu);
17117 cv_type = make_atomic_type (base_type);
17118 return set_die_type (die, cv_type, cu);
17121 /* Extract all information from a DW_TAG_string_type DIE and add to
17122 the user defined type vector. It isn't really a user defined type,
17123 but it behaves like one, with other DIE's using an AT_user_def_type
17124 attribute to reference it. */
17126 static struct type *
17127 read_tag_string_type (struct die_info *die, struct dwarf2_cu *cu)
17129 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
17130 struct gdbarch *gdbarch = get_objfile_arch (objfile);
17131 struct type *type, *range_type, *index_type, *char_type;
17132 struct attribute *attr;
17133 unsigned int length;
17135 attr = dwarf2_attr (die, DW_AT_string_length, cu);
17138 length = DW_UNSND (attr);
17142 /* Check for the DW_AT_byte_size attribute. */
17143 attr = dwarf2_attr (die, DW_AT_byte_size, cu);
17146 length = DW_UNSND (attr);
17154 index_type = objfile_type (objfile)->builtin_int;
17155 range_type = create_static_range_type (NULL, index_type, 1, length);
17156 char_type = language_string_char_type (cu->language_defn, gdbarch);
17157 type = create_string_type (NULL, char_type, range_type);
17159 return set_die_type (die, type, cu);
17162 /* Assuming that DIE corresponds to a function, returns nonzero
17163 if the function is prototyped. */
17166 prototyped_function_p (struct die_info *die, struct dwarf2_cu *cu)
17168 struct attribute *attr;
17170 attr = dwarf2_attr (die, DW_AT_prototyped, cu);
17171 if (attr && (DW_UNSND (attr) != 0))
17174 /* The DWARF standard implies that the DW_AT_prototyped attribute
17175 is only meaninful for C, but the concept also extends to other
17176 languages that allow unprototyped functions (Eg: Objective C).
17177 For all other languages, assume that functions are always
17179 if (cu->language != language_c
17180 && cu->language != language_objc
17181 && cu->language != language_opencl)
17184 /* RealView does not emit DW_AT_prototyped. We can not distinguish
17185 prototyped and unprototyped functions; default to prototyped,
17186 since that is more common in modern code (and RealView warns
17187 about unprototyped functions). */
17188 if (producer_is_realview (cu->producer))
17194 /* Handle DIES due to C code like:
17198 int (*funcp)(int a, long l);
17202 ('funcp' generates a DW_TAG_subroutine_type DIE). */
17204 static struct type *
17205 read_subroutine_type (struct die_info *die, struct dwarf2_cu *cu)
17207 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
17208 struct type *type; /* Type that this function returns. */
17209 struct type *ftype; /* Function that returns above type. */
17210 struct attribute *attr;
17212 type = die_type (die, cu);
17214 /* The die_type call above may have already set the type for this DIE. */
17215 ftype = get_die_type (die, cu);
17219 ftype = lookup_function_type (type);
17221 if (prototyped_function_p (die, cu))
17222 TYPE_PROTOTYPED (ftype) = 1;
17224 /* Store the calling convention in the type if it's available in
17225 the subroutine die. Otherwise set the calling convention to
17226 the default value DW_CC_normal. */
17227 attr = dwarf2_attr (die, DW_AT_calling_convention, cu);
17229 TYPE_CALLING_CONVENTION (ftype) = DW_UNSND (attr);
17230 else if (cu->producer && strstr (cu->producer, "IBM XL C for OpenCL"))
17231 TYPE_CALLING_CONVENTION (ftype) = DW_CC_GDB_IBM_OpenCL;
17233 TYPE_CALLING_CONVENTION (ftype) = DW_CC_normal;
17235 /* Record whether the function returns normally to its caller or not
17236 if the DWARF producer set that information. */
17237 attr = dwarf2_attr (die, DW_AT_noreturn, cu);
17238 if (attr && (DW_UNSND (attr) != 0))
17239 TYPE_NO_RETURN (ftype) = 1;
17241 /* We need to add the subroutine type to the die immediately so
17242 we don't infinitely recurse when dealing with parameters
17243 declared as the same subroutine type. */
17244 set_die_type (die, ftype, cu);
17246 if (die->child != NULL)
17248 struct type *void_type = objfile_type (objfile)->builtin_void;
17249 struct die_info *child_die;
17250 int nparams, iparams;
17252 /* Count the number of parameters.
17253 FIXME: GDB currently ignores vararg functions, but knows about
17254 vararg member functions. */
17256 child_die = die->child;
17257 while (child_die && child_die->tag)
17259 if (child_die->tag == DW_TAG_formal_parameter)
17261 else if (child_die->tag == DW_TAG_unspecified_parameters)
17262 TYPE_VARARGS (ftype) = 1;
17263 child_die = sibling_die (child_die);
17266 /* Allocate storage for parameters and fill them in. */
17267 TYPE_NFIELDS (ftype) = nparams;
17268 TYPE_FIELDS (ftype) = (struct field *)
17269 TYPE_ZALLOC (ftype, nparams * sizeof (struct field));
17271 /* TYPE_FIELD_TYPE must never be NULL. Pre-fill the array to ensure it
17272 even if we error out during the parameters reading below. */
17273 for (iparams = 0; iparams < nparams; iparams++)
17274 TYPE_FIELD_TYPE (ftype, iparams) = void_type;
17277 child_die = die->child;
17278 while (child_die && child_die->tag)
17280 if (child_die->tag == DW_TAG_formal_parameter)
17282 struct type *arg_type;
17284 /* DWARF version 2 has no clean way to discern C++
17285 static and non-static member functions. G++ helps
17286 GDB by marking the first parameter for non-static
17287 member functions (which is the this pointer) as
17288 artificial. We pass this information to
17289 dwarf2_add_member_fn via TYPE_FIELD_ARTIFICIAL.
17291 DWARF version 3 added DW_AT_object_pointer, which GCC
17292 4.5 does not yet generate. */
17293 attr = dwarf2_attr (child_die, DW_AT_artificial, cu);
17295 TYPE_FIELD_ARTIFICIAL (ftype, iparams) = DW_UNSND (attr);
17297 TYPE_FIELD_ARTIFICIAL (ftype, iparams) = 0;
17298 arg_type = die_type (child_die, cu);
17300 /* RealView does not mark THIS as const, which the testsuite
17301 expects. GCC marks THIS as const in method definitions,
17302 but not in the class specifications (GCC PR 43053). */
17303 if (cu->language == language_cplus && !TYPE_CONST (arg_type)
17304 && TYPE_FIELD_ARTIFICIAL (ftype, iparams))
17307 struct dwarf2_cu *arg_cu = cu;
17308 const char *name = dwarf2_name (child_die, cu);
17310 attr = dwarf2_attr (die, DW_AT_object_pointer, cu);
17313 /* If the compiler emits this, use it. */
17314 if (follow_die_ref (die, attr, &arg_cu) == child_die)
17317 else if (name && strcmp (name, "this") == 0)
17318 /* Function definitions will have the argument names. */
17320 else if (name == NULL && iparams == 0)
17321 /* Declarations may not have the names, so like
17322 elsewhere in GDB, assume an artificial first
17323 argument is "this". */
17327 arg_type = make_cv_type (1, TYPE_VOLATILE (arg_type),
17331 TYPE_FIELD_TYPE (ftype, iparams) = arg_type;
17334 child_die = sibling_die (child_die);
17341 static struct type *
17342 read_typedef (struct die_info *die, struct dwarf2_cu *cu)
17344 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
17345 const char *name = NULL;
17346 struct type *this_type, *target_type;
17348 name = dwarf2_full_name (NULL, die, cu);
17349 this_type = init_type (objfile, TYPE_CODE_TYPEDEF, 0, name);
17350 TYPE_TARGET_STUB (this_type) = 1;
17351 set_die_type (die, this_type, cu);
17352 target_type = die_type (die, cu);
17353 if (target_type != this_type)
17354 TYPE_TARGET_TYPE (this_type) = target_type;
17357 /* Self-referential typedefs are, it seems, not allowed by the DWARF
17358 spec and cause infinite loops in GDB. */
17359 complaint (&symfile_complaints,
17360 _("Self-referential DW_TAG_typedef "
17361 "- DIE at %s [in module %s]"),
17362 sect_offset_str (die->sect_off), objfile_name (objfile));
17363 TYPE_TARGET_TYPE (this_type) = NULL;
17368 /* Allocate a floating-point type of size BITS and name NAME. Pass NAME_HINT
17369 (which may be different from NAME) to the architecture back-end to allow
17370 it to guess the correct format if necessary. */
17372 static struct type *
17373 dwarf2_init_float_type (struct objfile *objfile, int bits, const char *name,
17374 const char *name_hint)
17376 struct gdbarch *gdbarch = get_objfile_arch (objfile);
17377 const struct floatformat **format;
17380 format = gdbarch_floatformat_for_type (gdbarch, name_hint, bits);
17382 type = init_float_type (objfile, bits, name, format);
17384 type = init_type (objfile, TYPE_CODE_ERROR, bits, name);
17389 /* Find a representation of a given base type and install
17390 it in the TYPE field of the die. */
17392 static struct type *
17393 read_base_type (struct die_info *die, struct dwarf2_cu *cu)
17395 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
17397 struct attribute *attr;
17398 int encoding = 0, bits = 0;
17401 attr = dwarf2_attr (die, DW_AT_encoding, cu);
17404 encoding = DW_UNSND (attr);
17406 attr = dwarf2_attr (die, DW_AT_byte_size, cu);
17409 bits = DW_UNSND (attr) * TARGET_CHAR_BIT;
17411 name = dwarf2_name (die, cu);
17414 complaint (&symfile_complaints,
17415 _("DW_AT_name missing from DW_TAG_base_type"));
17420 case DW_ATE_address:
17421 /* Turn DW_ATE_address into a void * pointer. */
17422 type = init_type (objfile, TYPE_CODE_VOID, TARGET_CHAR_BIT, NULL);
17423 type = init_pointer_type (objfile, bits, name, type);
17425 case DW_ATE_boolean:
17426 type = init_boolean_type (objfile, bits, 1, name);
17428 case DW_ATE_complex_float:
17429 type = dwarf2_init_float_type (objfile, bits / 2, NULL, name);
17430 type = init_complex_type (objfile, name, type);
17432 case DW_ATE_decimal_float:
17433 type = init_decfloat_type (objfile, bits, name);
17436 type = dwarf2_init_float_type (objfile, bits, name, name);
17438 case DW_ATE_signed:
17439 type = init_integer_type (objfile, bits, 0, name);
17441 case DW_ATE_unsigned:
17442 if (cu->language == language_fortran
17444 && startswith (name, "character("))
17445 type = init_character_type (objfile, bits, 1, name);
17447 type = init_integer_type (objfile, bits, 1, name);
17449 case DW_ATE_signed_char:
17450 if (cu->language == language_ada || cu->language == language_m2
17451 || cu->language == language_pascal
17452 || cu->language == language_fortran)
17453 type = init_character_type (objfile, bits, 0, name);
17455 type = init_integer_type (objfile, bits, 0, name);
17457 case DW_ATE_unsigned_char:
17458 if (cu->language == language_ada || cu->language == language_m2
17459 || cu->language == language_pascal
17460 || cu->language == language_fortran
17461 || cu->language == language_rust)
17462 type = init_character_type (objfile, bits, 1, name);
17464 type = init_integer_type (objfile, bits, 1, name);
17468 gdbarch *arch = get_objfile_arch (objfile);
17471 type = builtin_type (arch)->builtin_char16;
17472 else if (bits == 32)
17473 type = builtin_type (arch)->builtin_char32;
17476 complaint (&symfile_complaints,
17477 _("unsupported DW_ATE_UTF bit size: '%d'"),
17479 type = init_integer_type (objfile, bits, 1, name);
17481 return set_die_type (die, type, cu);
17486 complaint (&symfile_complaints, _("unsupported DW_AT_encoding: '%s'"),
17487 dwarf_type_encoding_name (encoding));
17488 type = init_type (objfile, TYPE_CODE_ERROR, bits, name);
17492 if (name && strcmp (name, "char") == 0)
17493 TYPE_NOSIGN (type) = 1;
17495 return set_die_type (die, type, cu);
17498 /* Parse dwarf attribute if it's a block, reference or constant and put the
17499 resulting value of the attribute into struct bound_prop.
17500 Returns 1 if ATTR could be resolved into PROP, 0 otherwise. */
17503 attr_to_dynamic_prop (const struct attribute *attr, struct die_info *die,
17504 struct dwarf2_cu *cu, struct dynamic_prop *prop)
17506 struct dwarf2_property_baton *baton;
17507 struct obstack *obstack
17508 = &cu->per_cu->dwarf2_per_objfile->objfile->objfile_obstack;
17510 if (attr == NULL || prop == NULL)
17513 if (attr_form_is_block (attr))
17515 baton = XOBNEW (obstack, struct dwarf2_property_baton);
17516 baton->referenced_type = NULL;
17517 baton->locexpr.per_cu = cu->per_cu;
17518 baton->locexpr.size = DW_BLOCK (attr)->size;
17519 baton->locexpr.data = DW_BLOCK (attr)->data;
17520 prop->data.baton = baton;
17521 prop->kind = PROP_LOCEXPR;
17522 gdb_assert (prop->data.baton != NULL);
17524 else if (attr_form_is_ref (attr))
17526 struct dwarf2_cu *target_cu = cu;
17527 struct die_info *target_die;
17528 struct attribute *target_attr;
17530 target_die = follow_die_ref (die, attr, &target_cu);
17531 target_attr = dwarf2_attr (target_die, DW_AT_location, target_cu);
17532 if (target_attr == NULL)
17533 target_attr = dwarf2_attr (target_die, DW_AT_data_member_location,
17535 if (target_attr == NULL)
17538 switch (target_attr->name)
17540 case DW_AT_location:
17541 if (attr_form_is_section_offset (target_attr))
17543 baton = XOBNEW (obstack, struct dwarf2_property_baton);
17544 baton->referenced_type = die_type (target_die, target_cu);
17545 fill_in_loclist_baton (cu, &baton->loclist, target_attr);
17546 prop->data.baton = baton;
17547 prop->kind = PROP_LOCLIST;
17548 gdb_assert (prop->data.baton != NULL);
17550 else if (attr_form_is_block (target_attr))
17552 baton = XOBNEW (obstack, struct dwarf2_property_baton);
17553 baton->referenced_type = die_type (target_die, target_cu);
17554 baton->locexpr.per_cu = cu->per_cu;
17555 baton->locexpr.size = DW_BLOCK (target_attr)->size;
17556 baton->locexpr.data = DW_BLOCK (target_attr)->data;
17557 prop->data.baton = baton;
17558 prop->kind = PROP_LOCEXPR;
17559 gdb_assert (prop->data.baton != NULL);
17563 dwarf2_invalid_attrib_class_complaint ("DW_AT_location",
17564 "dynamic property");
17568 case DW_AT_data_member_location:
17572 if (!handle_data_member_location (target_die, target_cu,
17576 baton = XOBNEW (obstack, struct dwarf2_property_baton);
17577 baton->referenced_type = read_type_die (target_die->parent,
17579 baton->offset_info.offset = offset;
17580 baton->offset_info.type = die_type (target_die, target_cu);
17581 prop->data.baton = baton;
17582 prop->kind = PROP_ADDR_OFFSET;
17587 else if (attr_form_is_constant (attr))
17589 prop->data.const_val = dwarf2_get_attr_constant_value (attr, 0);
17590 prop->kind = PROP_CONST;
17594 dwarf2_invalid_attrib_class_complaint (dwarf_form_name (attr->form),
17595 dwarf2_name (die, cu));
17602 /* Read the given DW_AT_subrange DIE. */
17604 static struct type *
17605 read_subrange_type (struct die_info *die, struct dwarf2_cu *cu)
17607 struct type *base_type, *orig_base_type;
17608 struct type *range_type;
17609 struct attribute *attr;
17610 struct dynamic_prop low, high;
17611 int low_default_is_valid;
17612 int high_bound_is_count = 0;
17614 LONGEST negative_mask;
17616 orig_base_type = die_type (die, cu);
17617 /* If ORIG_BASE_TYPE is a typedef, it will not be TYPE_UNSIGNED,
17618 whereas the real type might be. So, we use ORIG_BASE_TYPE when
17619 creating the range type, but we use the result of check_typedef
17620 when examining properties of the type. */
17621 base_type = check_typedef (orig_base_type);
17623 /* The die_type call above may have already set the type for this DIE. */
17624 range_type = get_die_type (die, cu);
17628 low.kind = PROP_CONST;
17629 high.kind = PROP_CONST;
17630 high.data.const_val = 0;
17632 /* Set LOW_DEFAULT_IS_VALID if current language and DWARF version allow
17633 omitting DW_AT_lower_bound. */
17634 switch (cu->language)
17637 case language_cplus:
17638 low.data.const_val = 0;
17639 low_default_is_valid = 1;
17641 case language_fortran:
17642 low.data.const_val = 1;
17643 low_default_is_valid = 1;
17646 case language_objc:
17647 case language_rust:
17648 low.data.const_val = 0;
17649 low_default_is_valid = (cu->header.version >= 4);
17653 case language_pascal:
17654 low.data.const_val = 1;
17655 low_default_is_valid = (cu->header.version >= 4);
17658 low.data.const_val = 0;
17659 low_default_is_valid = 0;
17663 attr = dwarf2_attr (die, DW_AT_lower_bound, cu);
17665 attr_to_dynamic_prop (attr, die, cu, &low);
17666 else if (!low_default_is_valid)
17667 complaint (&symfile_complaints, _("Missing DW_AT_lower_bound "
17668 "- DIE at %s [in module %s]"),
17669 sect_offset_str (die->sect_off),
17670 objfile_name (cu->per_cu->dwarf2_per_objfile->objfile));
17672 attr = dwarf2_attr (die, DW_AT_upper_bound, cu);
17673 if (!attr_to_dynamic_prop (attr, die, cu, &high))
17675 attr = dwarf2_attr (die, DW_AT_count, cu);
17676 if (attr_to_dynamic_prop (attr, die, cu, &high))
17678 /* If bounds are constant do the final calculation here. */
17679 if (low.kind == PROP_CONST && high.kind == PROP_CONST)
17680 high.data.const_val = low.data.const_val + high.data.const_val - 1;
17682 high_bound_is_count = 1;
17686 /* Dwarf-2 specifications explicitly allows to create subrange types
17687 without specifying a base type.
17688 In that case, the base type must be set to the type of
17689 the lower bound, upper bound or count, in that order, if any of these
17690 three attributes references an object that has a type.
17691 If no base type is found, the Dwarf-2 specifications say that
17692 a signed integer type of size equal to the size of an address should
17694 For the following C code: `extern char gdb_int [];'
17695 GCC produces an empty range DIE.
17696 FIXME: muller/2010-05-28: Possible references to object for low bound,
17697 high bound or count are not yet handled by this code. */
17698 if (TYPE_CODE (base_type) == TYPE_CODE_VOID)
17700 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
17701 struct gdbarch *gdbarch = get_objfile_arch (objfile);
17702 int addr_size = gdbarch_addr_bit (gdbarch) /8;
17703 struct type *int_type = objfile_type (objfile)->builtin_int;
17705 /* Test "int", "long int", and "long long int" objfile types,
17706 and select the first one having a size above or equal to the
17707 architecture address size. */
17708 if (int_type && TYPE_LENGTH (int_type) >= addr_size)
17709 base_type = int_type;
17712 int_type = objfile_type (objfile)->builtin_long;
17713 if (int_type && TYPE_LENGTH (int_type) >= addr_size)
17714 base_type = int_type;
17717 int_type = objfile_type (objfile)->builtin_long_long;
17718 if (int_type && TYPE_LENGTH (int_type) >= addr_size)
17719 base_type = int_type;
17724 /* Normally, the DWARF producers are expected to use a signed
17725 constant form (Eg. DW_FORM_sdata) to express negative bounds.
17726 But this is unfortunately not always the case, as witnessed
17727 with GCC, for instance, where the ambiguous DW_FORM_dataN form
17728 is used instead. To work around that ambiguity, we treat
17729 the bounds as signed, and thus sign-extend their values, when
17730 the base type is signed. */
17732 -((LONGEST) 1 << (TYPE_LENGTH (base_type) * TARGET_CHAR_BIT - 1));
17733 if (low.kind == PROP_CONST
17734 && !TYPE_UNSIGNED (base_type) && (low.data.const_val & negative_mask))
17735 low.data.const_val |= negative_mask;
17736 if (high.kind == PROP_CONST
17737 && !TYPE_UNSIGNED (base_type) && (high.data.const_val & negative_mask))
17738 high.data.const_val |= negative_mask;
17740 range_type = create_range_type (NULL, orig_base_type, &low, &high);
17742 if (high_bound_is_count)
17743 TYPE_RANGE_DATA (range_type)->flag_upper_bound_is_count = 1;
17745 /* Ada expects an empty array on no boundary attributes. */
17746 if (attr == NULL && cu->language != language_ada)
17747 TYPE_HIGH_BOUND_KIND (range_type) = PROP_UNDEFINED;
17749 name = dwarf2_name (die, cu);
17751 TYPE_NAME (range_type) = name;
17753 attr = dwarf2_attr (die, DW_AT_byte_size, cu);
17755 TYPE_LENGTH (range_type) = DW_UNSND (attr);
17757 set_die_type (die, range_type, cu);
17759 /* set_die_type should be already done. */
17760 set_descriptive_type (range_type, die, cu);
17765 static struct type *
17766 read_unspecified_type (struct die_info *die, struct dwarf2_cu *cu)
17770 type = init_type (cu->per_cu->dwarf2_per_objfile->objfile, TYPE_CODE_VOID,0,
17772 TYPE_NAME (type) = dwarf2_name (die, cu);
17774 /* In Ada, an unspecified type is typically used when the description
17775 of the type is defered to a different unit. When encountering
17776 such a type, we treat it as a stub, and try to resolve it later on,
17778 if (cu->language == language_ada)
17779 TYPE_STUB (type) = 1;
17781 return set_die_type (die, type, cu);
17784 /* Read a single die and all its descendents. Set the die's sibling
17785 field to NULL; set other fields in the die correctly, and set all
17786 of the descendents' fields correctly. Set *NEW_INFO_PTR to the
17787 location of the info_ptr after reading all of those dies. PARENT
17788 is the parent of the die in question. */
17790 static struct die_info *
17791 read_die_and_children (const struct die_reader_specs *reader,
17792 const gdb_byte *info_ptr,
17793 const gdb_byte **new_info_ptr,
17794 struct die_info *parent)
17796 struct die_info *die;
17797 const gdb_byte *cur_ptr;
17800 cur_ptr = read_full_die_1 (reader, &die, info_ptr, &has_children, 0);
17803 *new_info_ptr = cur_ptr;
17806 store_in_ref_table (die, reader->cu);
17809 die->child = read_die_and_siblings_1 (reader, cur_ptr, new_info_ptr, die);
17813 *new_info_ptr = cur_ptr;
17816 die->sibling = NULL;
17817 die->parent = parent;
17821 /* Read a die, all of its descendents, and all of its siblings; set
17822 all of the fields of all of the dies correctly. Arguments are as
17823 in read_die_and_children. */
17825 static struct die_info *
17826 read_die_and_siblings_1 (const struct die_reader_specs *reader,
17827 const gdb_byte *info_ptr,
17828 const gdb_byte **new_info_ptr,
17829 struct die_info *parent)
17831 struct die_info *first_die, *last_sibling;
17832 const gdb_byte *cur_ptr;
17834 cur_ptr = info_ptr;
17835 first_die = last_sibling = NULL;
17839 struct die_info *die
17840 = read_die_and_children (reader, cur_ptr, &cur_ptr, parent);
17844 *new_info_ptr = cur_ptr;
17851 last_sibling->sibling = die;
17853 last_sibling = die;
17857 /* Read a die, all of its descendents, and all of its siblings; set
17858 all of the fields of all of the dies correctly. Arguments are as
17859 in read_die_and_children.
17860 This the main entry point for reading a DIE and all its children. */
17862 static struct die_info *
17863 read_die_and_siblings (const struct die_reader_specs *reader,
17864 const gdb_byte *info_ptr,
17865 const gdb_byte **new_info_ptr,
17866 struct die_info *parent)
17868 struct die_info *die = read_die_and_siblings_1 (reader, info_ptr,
17869 new_info_ptr, parent);
17871 if (dwarf_die_debug)
17873 fprintf_unfiltered (gdb_stdlog,
17874 "Read die from %s@0x%x of %s:\n",
17875 get_section_name (reader->die_section),
17876 (unsigned) (info_ptr - reader->die_section->buffer),
17877 bfd_get_filename (reader->abfd));
17878 dump_die (die, dwarf_die_debug);
17884 /* Read a die and all its attributes, leave space for NUM_EXTRA_ATTRS
17886 The caller is responsible for filling in the extra attributes
17887 and updating (*DIEP)->num_attrs.
17888 Set DIEP to point to a newly allocated die with its information,
17889 except for its child, sibling, and parent fields.
17890 Set HAS_CHILDREN to tell whether the die has children or not. */
17892 static const gdb_byte *
17893 read_full_die_1 (const struct die_reader_specs *reader,
17894 struct die_info **diep, const gdb_byte *info_ptr,
17895 int *has_children, int num_extra_attrs)
17897 unsigned int abbrev_number, bytes_read, i;
17898 struct abbrev_info *abbrev;
17899 struct die_info *die;
17900 struct dwarf2_cu *cu = reader->cu;
17901 bfd *abfd = reader->abfd;
17903 sect_offset sect_off = (sect_offset) (info_ptr - reader->buffer);
17904 abbrev_number = read_unsigned_leb128 (abfd, info_ptr, &bytes_read);
17905 info_ptr += bytes_read;
17906 if (!abbrev_number)
17913 abbrev = reader->abbrev_table->lookup_abbrev (abbrev_number);
17915 error (_("Dwarf Error: could not find abbrev number %d [in module %s]"),
17917 bfd_get_filename (abfd));
17919 die = dwarf_alloc_die (cu, abbrev->num_attrs + num_extra_attrs);
17920 die->sect_off = sect_off;
17921 die->tag = abbrev->tag;
17922 die->abbrev = abbrev_number;
17924 /* Make the result usable.
17925 The caller needs to update num_attrs after adding the extra
17927 die->num_attrs = abbrev->num_attrs;
17929 for (i = 0; i < abbrev->num_attrs; ++i)
17930 info_ptr = read_attribute (reader, &die->attrs[i], &abbrev->attrs[i],
17934 *has_children = abbrev->has_children;
17938 /* Read a die and all its attributes.
17939 Set DIEP to point to a newly allocated die with its information,
17940 except for its child, sibling, and parent fields.
17941 Set HAS_CHILDREN to tell whether the die has children or not. */
17943 static const gdb_byte *
17944 read_full_die (const struct die_reader_specs *reader,
17945 struct die_info **diep, const gdb_byte *info_ptr,
17948 const gdb_byte *result;
17950 result = read_full_die_1 (reader, diep, info_ptr, has_children, 0);
17952 if (dwarf_die_debug)
17954 fprintf_unfiltered (gdb_stdlog,
17955 "Read die from %s@0x%x of %s:\n",
17956 get_section_name (reader->die_section),
17957 (unsigned) (info_ptr - reader->die_section->buffer),
17958 bfd_get_filename (reader->abfd));
17959 dump_die (*diep, dwarf_die_debug);
17965 /* Abbreviation tables.
17967 In DWARF version 2, the description of the debugging information is
17968 stored in a separate .debug_abbrev section. Before we read any
17969 dies from a section we read in all abbreviations and install them
17970 in a hash table. */
17972 /* Allocate space for a struct abbrev_info object in ABBREV_TABLE. */
17974 struct abbrev_info *
17975 abbrev_table::alloc_abbrev ()
17977 struct abbrev_info *abbrev;
17979 abbrev = XOBNEW (&abbrev_obstack, struct abbrev_info);
17980 memset (abbrev, 0, sizeof (struct abbrev_info));
17985 /* Add an abbreviation to the table. */
17988 abbrev_table::add_abbrev (unsigned int abbrev_number,
17989 struct abbrev_info *abbrev)
17991 unsigned int hash_number;
17993 hash_number = abbrev_number % ABBREV_HASH_SIZE;
17994 abbrev->next = m_abbrevs[hash_number];
17995 m_abbrevs[hash_number] = abbrev;
17998 /* Look up an abbrev in the table.
17999 Returns NULL if the abbrev is not found. */
18001 struct abbrev_info *
18002 abbrev_table::lookup_abbrev (unsigned int abbrev_number)
18004 unsigned int hash_number;
18005 struct abbrev_info *abbrev;
18007 hash_number = abbrev_number % ABBREV_HASH_SIZE;
18008 abbrev = m_abbrevs[hash_number];
18012 if (abbrev->number == abbrev_number)
18014 abbrev = abbrev->next;
18019 /* Read in an abbrev table. */
18021 static abbrev_table_up
18022 abbrev_table_read_table (struct dwarf2_per_objfile *dwarf2_per_objfile,
18023 struct dwarf2_section_info *section,
18024 sect_offset sect_off)
18026 struct objfile *objfile = dwarf2_per_objfile->objfile;
18027 bfd *abfd = get_section_bfd_owner (section);
18028 const gdb_byte *abbrev_ptr;
18029 struct abbrev_info *cur_abbrev;
18030 unsigned int abbrev_number, bytes_read, abbrev_name;
18031 unsigned int abbrev_form;
18032 struct attr_abbrev *cur_attrs;
18033 unsigned int allocated_attrs;
18035 abbrev_table_up abbrev_table (new struct abbrev_table (sect_off));
18037 dwarf2_read_section (objfile, section);
18038 abbrev_ptr = section->buffer + to_underlying (sect_off);
18039 abbrev_number = read_unsigned_leb128 (abfd, abbrev_ptr, &bytes_read);
18040 abbrev_ptr += bytes_read;
18042 allocated_attrs = ATTR_ALLOC_CHUNK;
18043 cur_attrs = XNEWVEC (struct attr_abbrev, allocated_attrs);
18045 /* Loop until we reach an abbrev number of 0. */
18046 while (abbrev_number)
18048 cur_abbrev = abbrev_table->alloc_abbrev ();
18050 /* read in abbrev header */
18051 cur_abbrev->number = abbrev_number;
18053 = (enum dwarf_tag) read_unsigned_leb128 (abfd, abbrev_ptr, &bytes_read);
18054 abbrev_ptr += bytes_read;
18055 cur_abbrev->has_children = read_1_byte (abfd, abbrev_ptr);
18058 /* now read in declarations */
18061 LONGEST implicit_const;
18063 abbrev_name = read_unsigned_leb128 (abfd, abbrev_ptr, &bytes_read);
18064 abbrev_ptr += bytes_read;
18065 abbrev_form = read_unsigned_leb128 (abfd, abbrev_ptr, &bytes_read);
18066 abbrev_ptr += bytes_read;
18067 if (abbrev_form == DW_FORM_implicit_const)
18069 implicit_const = read_signed_leb128 (abfd, abbrev_ptr,
18071 abbrev_ptr += bytes_read;
18075 /* Initialize it due to a false compiler warning. */
18076 implicit_const = -1;
18079 if (abbrev_name == 0)
18082 if (cur_abbrev->num_attrs == allocated_attrs)
18084 allocated_attrs += ATTR_ALLOC_CHUNK;
18086 = XRESIZEVEC (struct attr_abbrev, cur_attrs, allocated_attrs);
18089 cur_attrs[cur_abbrev->num_attrs].name
18090 = (enum dwarf_attribute) abbrev_name;
18091 cur_attrs[cur_abbrev->num_attrs].form
18092 = (enum dwarf_form) abbrev_form;
18093 cur_attrs[cur_abbrev->num_attrs].implicit_const = implicit_const;
18094 ++cur_abbrev->num_attrs;
18097 cur_abbrev->attrs =
18098 XOBNEWVEC (&abbrev_table->abbrev_obstack, struct attr_abbrev,
18099 cur_abbrev->num_attrs);
18100 memcpy (cur_abbrev->attrs, cur_attrs,
18101 cur_abbrev->num_attrs * sizeof (struct attr_abbrev));
18103 abbrev_table->add_abbrev (abbrev_number, cur_abbrev);
18105 /* Get next abbreviation.
18106 Under Irix6 the abbreviations for a compilation unit are not
18107 always properly terminated with an abbrev number of 0.
18108 Exit loop if we encounter an abbreviation which we have
18109 already read (which means we are about to read the abbreviations
18110 for the next compile unit) or if the end of the abbreviation
18111 table is reached. */
18112 if ((unsigned int) (abbrev_ptr - section->buffer) >= section->size)
18114 abbrev_number = read_unsigned_leb128 (abfd, abbrev_ptr, &bytes_read);
18115 abbrev_ptr += bytes_read;
18116 if (abbrev_table->lookup_abbrev (abbrev_number) != NULL)
18121 return abbrev_table;
18124 /* Returns nonzero if TAG represents a type that we might generate a partial
18128 is_type_tag_for_partial (int tag)
18133 /* Some types that would be reasonable to generate partial symbols for,
18134 that we don't at present. */
18135 case DW_TAG_array_type:
18136 case DW_TAG_file_type:
18137 case DW_TAG_ptr_to_member_type:
18138 case DW_TAG_set_type:
18139 case DW_TAG_string_type:
18140 case DW_TAG_subroutine_type:
18142 case DW_TAG_base_type:
18143 case DW_TAG_class_type:
18144 case DW_TAG_interface_type:
18145 case DW_TAG_enumeration_type:
18146 case DW_TAG_structure_type:
18147 case DW_TAG_subrange_type:
18148 case DW_TAG_typedef:
18149 case DW_TAG_union_type:
18156 /* Load all DIEs that are interesting for partial symbols into memory. */
18158 static struct partial_die_info *
18159 load_partial_dies (const struct die_reader_specs *reader,
18160 const gdb_byte *info_ptr, int building_psymtab)
18162 struct dwarf2_cu *cu = reader->cu;
18163 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
18164 struct partial_die_info *parent_die, *last_die, *first_die = NULL;
18165 unsigned int bytes_read;
18166 unsigned int load_all = 0;
18167 int nesting_level = 1;
18172 gdb_assert (cu->per_cu != NULL);
18173 if (cu->per_cu->load_all_dies)
18177 = htab_create_alloc_ex (cu->header.length / 12,
18181 &cu->comp_unit_obstack,
18182 hashtab_obstack_allocate,
18183 dummy_obstack_deallocate);
18187 abbrev_info *abbrev = peek_die_abbrev (*reader, info_ptr, &bytes_read);
18189 /* A NULL abbrev means the end of a series of children. */
18190 if (abbrev == NULL)
18192 if (--nesting_level == 0)
18195 info_ptr += bytes_read;
18196 last_die = parent_die;
18197 parent_die = parent_die->die_parent;
18201 /* Check for template arguments. We never save these; if
18202 they're seen, we just mark the parent, and go on our way. */
18203 if (parent_die != NULL
18204 && cu->language == language_cplus
18205 && (abbrev->tag == DW_TAG_template_type_param
18206 || abbrev->tag == DW_TAG_template_value_param))
18208 parent_die->has_template_arguments = 1;
18212 /* We don't need a partial DIE for the template argument. */
18213 info_ptr = skip_one_die (reader, info_ptr + bytes_read, abbrev);
18218 /* We only recurse into c++ subprograms looking for template arguments.
18219 Skip their other children. */
18221 && cu->language == language_cplus
18222 && parent_die != NULL
18223 && parent_die->tag == DW_TAG_subprogram)
18225 info_ptr = skip_one_die (reader, info_ptr + bytes_read, abbrev);
18229 /* Check whether this DIE is interesting enough to save. Normally
18230 we would not be interested in members here, but there may be
18231 later variables referencing them via DW_AT_specification (for
18232 static members). */
18234 && !is_type_tag_for_partial (abbrev->tag)
18235 && abbrev->tag != DW_TAG_constant
18236 && abbrev->tag != DW_TAG_enumerator
18237 && abbrev->tag != DW_TAG_subprogram
18238 && abbrev->tag != DW_TAG_inlined_subroutine
18239 && abbrev->tag != DW_TAG_lexical_block
18240 && abbrev->tag != DW_TAG_variable
18241 && abbrev->tag != DW_TAG_namespace
18242 && abbrev->tag != DW_TAG_module
18243 && abbrev->tag != DW_TAG_member
18244 && abbrev->tag != DW_TAG_imported_unit
18245 && abbrev->tag != DW_TAG_imported_declaration)
18247 /* Otherwise we skip to the next sibling, if any. */
18248 info_ptr = skip_one_die (reader, info_ptr + bytes_read, abbrev);
18252 struct partial_die_info pdi ((sect_offset) (info_ptr - reader->buffer),
18255 info_ptr = pdi.read (reader, *abbrev, info_ptr + bytes_read);
18257 /* This two-pass algorithm for processing partial symbols has a
18258 high cost in cache pressure. Thus, handle some simple cases
18259 here which cover the majority of C partial symbols. DIEs
18260 which neither have specification tags in them, nor could have
18261 specification tags elsewhere pointing at them, can simply be
18262 processed and discarded.
18264 This segment is also optional; scan_partial_symbols and
18265 add_partial_symbol will handle these DIEs if we chain
18266 them in normally. When compilers which do not emit large
18267 quantities of duplicate debug information are more common,
18268 this code can probably be removed. */
18270 /* Any complete simple types at the top level (pretty much all
18271 of them, for a language without namespaces), can be processed
18273 if (parent_die == NULL
18274 && pdi.has_specification == 0
18275 && pdi.is_declaration == 0
18276 && ((pdi.tag == DW_TAG_typedef && !pdi.has_children)
18277 || pdi.tag == DW_TAG_base_type
18278 || pdi.tag == DW_TAG_subrange_type))
18280 if (building_psymtab && pdi.name != NULL)
18281 add_psymbol_to_list (pdi.name, strlen (pdi.name), 0,
18282 VAR_DOMAIN, LOC_TYPEDEF,
18283 &objfile->static_psymbols,
18284 0, cu->language, objfile);
18285 info_ptr = locate_pdi_sibling (reader, &pdi, info_ptr);
18289 /* The exception for DW_TAG_typedef with has_children above is
18290 a workaround of GCC PR debug/47510. In the case of this complaint
18291 type_name_no_tag_or_error will error on such types later.
18293 GDB skipped children of DW_TAG_typedef by the shortcut above and then
18294 it could not find the child DIEs referenced later, this is checked
18295 above. In correct DWARF DW_TAG_typedef should have no children. */
18297 if (pdi.tag == DW_TAG_typedef && pdi.has_children)
18298 complaint (&symfile_complaints,
18299 _("DW_TAG_typedef has childen - GCC PR debug/47510 bug "
18300 "- DIE at %s [in module %s]"),
18301 sect_offset_str (pdi.sect_off), objfile_name (objfile));
18303 /* If we're at the second level, and we're an enumerator, and
18304 our parent has no specification (meaning possibly lives in a
18305 namespace elsewhere), then we can add the partial symbol now
18306 instead of queueing it. */
18307 if (pdi.tag == DW_TAG_enumerator
18308 && parent_die != NULL
18309 && parent_die->die_parent == NULL
18310 && parent_die->tag == DW_TAG_enumeration_type
18311 && parent_die->has_specification == 0)
18313 if (pdi.name == NULL)
18314 complaint (&symfile_complaints,
18315 _("malformed enumerator DIE ignored"));
18316 else if (building_psymtab)
18317 add_psymbol_to_list (pdi.name, strlen (pdi.name), 0,
18318 VAR_DOMAIN, LOC_CONST,
18319 cu->language == language_cplus
18320 ? &objfile->global_psymbols
18321 : &objfile->static_psymbols,
18322 0, cu->language, objfile);
18324 info_ptr = locate_pdi_sibling (reader, &pdi, info_ptr);
18328 struct partial_die_info *part_die
18329 = new (&cu->comp_unit_obstack) partial_die_info (pdi);
18331 /* We'll save this DIE so link it in. */
18332 part_die->die_parent = parent_die;
18333 part_die->die_sibling = NULL;
18334 part_die->die_child = NULL;
18336 if (last_die && last_die == parent_die)
18337 last_die->die_child = part_die;
18339 last_die->die_sibling = part_die;
18341 last_die = part_die;
18343 if (first_die == NULL)
18344 first_die = part_die;
18346 /* Maybe add the DIE to the hash table. Not all DIEs that we
18347 find interesting need to be in the hash table, because we
18348 also have the parent/sibling/child chains; only those that we
18349 might refer to by offset later during partial symbol reading.
18351 For now this means things that might have be the target of a
18352 DW_AT_specification, DW_AT_abstract_origin, or
18353 DW_AT_extension. DW_AT_extension will refer only to
18354 namespaces; DW_AT_abstract_origin refers to functions (and
18355 many things under the function DIE, but we do not recurse
18356 into function DIEs during partial symbol reading) and
18357 possibly variables as well; DW_AT_specification refers to
18358 declarations. Declarations ought to have the DW_AT_declaration
18359 flag. It happens that GCC forgets to put it in sometimes, but
18360 only for functions, not for types.
18362 Adding more things than necessary to the hash table is harmless
18363 except for the performance cost. Adding too few will result in
18364 wasted time in find_partial_die, when we reread the compilation
18365 unit with load_all_dies set. */
18368 || abbrev->tag == DW_TAG_constant
18369 || abbrev->tag == DW_TAG_subprogram
18370 || abbrev->tag == DW_TAG_variable
18371 || abbrev->tag == DW_TAG_namespace
18372 || part_die->is_declaration)
18376 slot = htab_find_slot_with_hash (cu->partial_dies, part_die,
18377 to_underlying (part_die->sect_off),
18382 /* For some DIEs we want to follow their children (if any). For C
18383 we have no reason to follow the children of structures; for other
18384 languages we have to, so that we can get at method physnames
18385 to infer fully qualified class names, for DW_AT_specification,
18386 and for C++ template arguments. For C++, we also look one level
18387 inside functions to find template arguments (if the name of the
18388 function does not already contain the template arguments).
18390 For Ada, we need to scan the children of subprograms and lexical
18391 blocks as well because Ada allows the definition of nested
18392 entities that could be interesting for the debugger, such as
18393 nested subprograms for instance. */
18394 if (last_die->has_children
18396 || last_die->tag == DW_TAG_namespace
18397 || last_die->tag == DW_TAG_module
18398 || last_die->tag == DW_TAG_enumeration_type
18399 || (cu->language == language_cplus
18400 && last_die->tag == DW_TAG_subprogram
18401 && (last_die->name == NULL
18402 || strchr (last_die->name, '<') == NULL))
18403 || (cu->language != language_c
18404 && (last_die->tag == DW_TAG_class_type
18405 || last_die->tag == DW_TAG_interface_type
18406 || last_die->tag == DW_TAG_structure_type
18407 || last_die->tag == DW_TAG_union_type))
18408 || (cu->language == language_ada
18409 && (last_die->tag == DW_TAG_subprogram
18410 || last_die->tag == DW_TAG_lexical_block))))
18413 parent_die = last_die;
18417 /* Otherwise we skip to the next sibling, if any. */
18418 info_ptr = locate_pdi_sibling (reader, last_die, info_ptr);
18420 /* Back to the top, do it again. */
18424 partial_die_info::partial_die_info (sect_offset sect_off_,
18425 struct abbrev_info *abbrev)
18426 : partial_die_info (sect_off_, abbrev->tag, abbrev->has_children)
18430 /* Read a minimal amount of information into the minimal die structure.
18431 INFO_PTR should point just after the initial uleb128 of a DIE. */
18434 partial_die_info::read (const struct die_reader_specs *reader,
18435 const struct abbrev_info &abbrev, const gdb_byte *info_ptr)
18437 struct dwarf2_cu *cu = reader->cu;
18438 struct dwarf2_per_objfile *dwarf2_per_objfile
18439 = cu->per_cu->dwarf2_per_objfile;
18441 int has_low_pc_attr = 0;
18442 int has_high_pc_attr = 0;
18443 int high_pc_relative = 0;
18445 for (i = 0; i < abbrev.num_attrs; ++i)
18447 struct attribute attr;
18449 info_ptr = read_attribute (reader, &attr, &abbrev.attrs[i], info_ptr);
18451 /* Store the data if it is of an attribute we want to keep in a
18452 partial symbol table. */
18458 case DW_TAG_compile_unit:
18459 case DW_TAG_partial_unit:
18460 case DW_TAG_type_unit:
18461 /* Compilation units have a DW_AT_name that is a filename, not
18462 a source language identifier. */
18463 case DW_TAG_enumeration_type:
18464 case DW_TAG_enumerator:
18465 /* These tags always have simple identifiers already; no need
18466 to canonicalize them. */
18467 name = DW_STRING (&attr);
18471 struct objfile *objfile = dwarf2_per_objfile->objfile;
18474 = dwarf2_canonicalize_name (DW_STRING (&attr), cu,
18475 &objfile->per_bfd->storage_obstack);
18480 case DW_AT_linkage_name:
18481 case DW_AT_MIPS_linkage_name:
18482 /* Note that both forms of linkage name might appear. We
18483 assume they will be the same, and we only store the last
18485 if (cu->language == language_ada)
18486 name = DW_STRING (&attr);
18487 linkage_name = DW_STRING (&attr);
18490 has_low_pc_attr = 1;
18491 lowpc = attr_value_as_address (&attr);
18493 case DW_AT_high_pc:
18494 has_high_pc_attr = 1;
18495 highpc = attr_value_as_address (&attr);
18496 if (cu->header.version >= 4 && attr_form_is_constant (&attr))
18497 high_pc_relative = 1;
18499 case DW_AT_location:
18500 /* Support the .debug_loc offsets. */
18501 if (attr_form_is_block (&attr))
18503 d.locdesc = DW_BLOCK (&attr);
18505 else if (attr_form_is_section_offset (&attr))
18507 dwarf2_complex_location_expr_complaint ();
18511 dwarf2_invalid_attrib_class_complaint ("DW_AT_location",
18512 "partial symbol information");
18515 case DW_AT_external:
18516 is_external = DW_UNSND (&attr);
18518 case DW_AT_declaration:
18519 is_declaration = DW_UNSND (&attr);
18524 case DW_AT_abstract_origin:
18525 case DW_AT_specification:
18526 case DW_AT_extension:
18527 has_specification = 1;
18528 spec_offset = dwarf2_get_ref_die_offset (&attr);
18529 spec_is_dwz = (attr.form == DW_FORM_GNU_ref_alt
18530 || cu->per_cu->is_dwz);
18532 case DW_AT_sibling:
18533 /* Ignore absolute siblings, they might point outside of
18534 the current compile unit. */
18535 if (attr.form == DW_FORM_ref_addr)
18536 complaint (&symfile_complaints,
18537 _("ignoring absolute DW_AT_sibling"));
18540 const gdb_byte *buffer = reader->buffer;
18541 sect_offset off = dwarf2_get_ref_die_offset (&attr);
18542 const gdb_byte *sibling_ptr = buffer + to_underlying (off);
18544 if (sibling_ptr < info_ptr)
18545 complaint (&symfile_complaints,
18546 _("DW_AT_sibling points backwards"));
18547 else if (sibling_ptr > reader->buffer_end)
18548 dwarf2_section_buffer_overflow_complaint (reader->die_section);
18550 sibling = sibling_ptr;
18553 case DW_AT_byte_size:
18556 case DW_AT_const_value:
18557 has_const_value = 1;
18559 case DW_AT_calling_convention:
18560 /* DWARF doesn't provide a way to identify a program's source-level
18561 entry point. DW_AT_calling_convention attributes are only meant
18562 to describe functions' calling conventions.
18564 However, because it's a necessary piece of information in
18565 Fortran, and before DWARF 4 DW_CC_program was the only
18566 piece of debugging information whose definition refers to
18567 a 'main program' at all, several compilers marked Fortran
18568 main programs with DW_CC_program --- even when those
18569 functions use the standard calling conventions.
18571 Although DWARF now specifies a way to provide this
18572 information, we support this practice for backward
18574 if (DW_UNSND (&attr) == DW_CC_program
18575 && cu->language == language_fortran)
18576 main_subprogram = 1;
18579 if (DW_UNSND (&attr) == DW_INL_inlined
18580 || DW_UNSND (&attr) == DW_INL_declared_inlined)
18581 may_be_inlined = 1;
18585 if (tag == DW_TAG_imported_unit)
18587 d.sect_off = dwarf2_get_ref_die_offset (&attr);
18588 is_dwz = (attr.form == DW_FORM_GNU_ref_alt
18589 || cu->per_cu->is_dwz);
18593 case DW_AT_main_subprogram:
18594 main_subprogram = DW_UNSND (&attr);
18602 if (high_pc_relative)
18605 if (has_low_pc_attr && has_high_pc_attr)
18607 /* When using the GNU linker, .gnu.linkonce. sections are used to
18608 eliminate duplicate copies of functions and vtables and such.
18609 The linker will arbitrarily choose one and discard the others.
18610 The AT_*_pc values for such functions refer to local labels in
18611 these sections. If the section from that file was discarded, the
18612 labels are not in the output, so the relocs get a value of 0.
18613 If this is a discarded function, mark the pc bounds as invalid,
18614 so that GDB will ignore it. */
18615 if (lowpc == 0 && !dwarf2_per_objfile->has_section_at_zero)
18617 struct objfile *objfile = dwarf2_per_objfile->objfile;
18618 struct gdbarch *gdbarch = get_objfile_arch (objfile);
18620 complaint (&symfile_complaints,
18621 _("DW_AT_low_pc %s is zero "
18622 "for DIE at %s [in module %s]"),
18623 paddress (gdbarch, lowpc),
18624 sect_offset_str (sect_off),
18625 objfile_name (objfile));
18627 /* dwarf2_get_pc_bounds has also the strict low < high requirement. */
18628 else if (lowpc >= highpc)
18630 struct objfile *objfile = dwarf2_per_objfile->objfile;
18631 struct gdbarch *gdbarch = get_objfile_arch (objfile);
18633 complaint (&symfile_complaints,
18634 _("DW_AT_low_pc %s is not < DW_AT_high_pc %s "
18635 "for DIE at %s [in module %s]"),
18636 paddress (gdbarch, lowpc),
18637 paddress (gdbarch, highpc),
18638 sect_offset_str (sect_off),
18639 objfile_name (objfile));
18648 /* Find a cached partial DIE at OFFSET in CU. */
18650 struct partial_die_info *
18651 dwarf2_cu::find_partial_die (sect_offset sect_off)
18653 struct partial_die_info *lookup_die = NULL;
18654 struct partial_die_info part_die (sect_off);
18656 lookup_die = ((struct partial_die_info *)
18657 htab_find_with_hash (partial_dies, &part_die,
18658 to_underlying (sect_off)));
18663 /* Find a partial DIE at OFFSET, which may or may not be in CU,
18664 except in the case of .debug_types DIEs which do not reference
18665 outside their CU (they do however referencing other types via
18666 DW_FORM_ref_sig8). */
18668 static struct partial_die_info *
18669 find_partial_die (sect_offset sect_off, int offset_in_dwz, struct dwarf2_cu *cu)
18671 struct dwarf2_per_objfile *dwarf2_per_objfile
18672 = cu->per_cu->dwarf2_per_objfile;
18673 struct objfile *objfile = dwarf2_per_objfile->objfile;
18674 struct dwarf2_per_cu_data *per_cu = NULL;
18675 struct partial_die_info *pd = NULL;
18677 if (offset_in_dwz == cu->per_cu->is_dwz
18678 && offset_in_cu_p (&cu->header, sect_off))
18680 pd = cu->find_partial_die (sect_off);
18683 /* We missed recording what we needed.
18684 Load all dies and try again. */
18685 per_cu = cu->per_cu;
18689 /* TUs don't reference other CUs/TUs (except via type signatures). */
18690 if (cu->per_cu->is_debug_types)
18692 error (_("Dwarf Error: Type Unit at offset %s contains"
18693 " external reference to offset %s [in module %s].\n"),
18694 sect_offset_str (cu->header.sect_off), sect_offset_str (sect_off),
18695 bfd_get_filename (objfile->obfd));
18697 per_cu = dwarf2_find_containing_comp_unit (sect_off, offset_in_dwz,
18698 dwarf2_per_objfile);
18700 if (per_cu->cu == NULL || per_cu->cu->partial_dies == NULL)
18701 load_partial_comp_unit (per_cu);
18703 per_cu->cu->last_used = 0;
18704 pd = per_cu->cu->find_partial_die (sect_off);
18707 /* If we didn't find it, and not all dies have been loaded,
18708 load them all and try again. */
18710 if (pd == NULL && per_cu->load_all_dies == 0)
18712 per_cu->load_all_dies = 1;
18714 /* This is nasty. When we reread the DIEs, somewhere up the call chain
18715 THIS_CU->cu may already be in use. So we can't just free it and
18716 replace its DIEs with the ones we read in. Instead, we leave those
18717 DIEs alone (which can still be in use, e.g. in scan_partial_symbols),
18718 and clobber THIS_CU->cu->partial_dies with the hash table for the new
18720 load_partial_comp_unit (per_cu);
18722 pd = per_cu->cu->find_partial_die (sect_off);
18726 internal_error (__FILE__, __LINE__,
18727 _("could not find partial DIE %s "
18728 "in cache [from module %s]\n"),
18729 sect_offset_str (sect_off), bfd_get_filename (objfile->obfd));
18733 /* See if we can figure out if the class lives in a namespace. We do
18734 this by looking for a member function; its demangled name will
18735 contain namespace info, if there is any. */
18738 guess_partial_die_structure_name (struct partial_die_info *struct_pdi,
18739 struct dwarf2_cu *cu)
18741 /* NOTE: carlton/2003-10-07: Getting the info this way changes
18742 what template types look like, because the demangler
18743 frequently doesn't give the same name as the debug info. We
18744 could fix this by only using the demangled name to get the
18745 prefix (but see comment in read_structure_type). */
18747 struct partial_die_info *real_pdi;
18748 struct partial_die_info *child_pdi;
18750 /* If this DIE (this DIE's specification, if any) has a parent, then
18751 we should not do this. We'll prepend the parent's fully qualified
18752 name when we create the partial symbol. */
18754 real_pdi = struct_pdi;
18755 while (real_pdi->has_specification)
18756 real_pdi = find_partial_die (real_pdi->spec_offset,
18757 real_pdi->spec_is_dwz, cu);
18759 if (real_pdi->die_parent != NULL)
18762 for (child_pdi = struct_pdi->die_child;
18764 child_pdi = child_pdi->die_sibling)
18766 if (child_pdi->tag == DW_TAG_subprogram
18767 && child_pdi->linkage_name != NULL)
18769 char *actual_class_name
18770 = language_class_name_from_physname (cu->language_defn,
18771 child_pdi->linkage_name);
18772 if (actual_class_name != NULL)
18774 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
18777 obstack_copy0 (&objfile->per_bfd->storage_obstack,
18779 strlen (actual_class_name)));
18780 xfree (actual_class_name);
18788 partial_die_info::fixup (struct dwarf2_cu *cu)
18790 /* Once we've fixed up a die, there's no point in doing so again.
18791 This also avoids a memory leak if we were to call
18792 guess_partial_die_structure_name multiple times. */
18796 /* If we found a reference attribute and the DIE has no name, try
18797 to find a name in the referred to DIE. */
18799 if (name == NULL && has_specification)
18801 struct partial_die_info *spec_die;
18803 spec_die = find_partial_die (spec_offset, spec_is_dwz, cu);
18805 spec_die->fixup (cu);
18807 if (spec_die->name)
18809 name = spec_die->name;
18811 /* Copy DW_AT_external attribute if it is set. */
18812 if (spec_die->is_external)
18813 is_external = spec_die->is_external;
18817 /* Set default names for some unnamed DIEs. */
18819 if (name == NULL && tag == DW_TAG_namespace)
18820 name = CP_ANONYMOUS_NAMESPACE_STR;
18822 /* If there is no parent die to provide a namespace, and there are
18823 children, see if we can determine the namespace from their linkage
18825 if (cu->language == language_cplus
18826 && !VEC_empty (dwarf2_section_info_def,
18827 cu->per_cu->dwarf2_per_objfile->types)
18828 && die_parent == NULL
18830 && (tag == DW_TAG_class_type
18831 || tag == DW_TAG_structure_type
18832 || tag == DW_TAG_union_type))
18833 guess_partial_die_structure_name (this, cu);
18835 /* GCC might emit a nameless struct or union that has a linkage
18836 name. See http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47510. */
18838 && (tag == DW_TAG_class_type
18839 || tag == DW_TAG_interface_type
18840 || tag == DW_TAG_structure_type
18841 || tag == DW_TAG_union_type)
18842 && linkage_name != NULL)
18846 demangled = gdb_demangle (linkage_name, DMGL_TYPES);
18851 /* Strip any leading namespaces/classes, keep only the base name.
18852 DW_AT_name for named DIEs does not contain the prefixes. */
18853 base = strrchr (demangled, ':');
18854 if (base && base > demangled && base[-1] == ':')
18859 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
18862 obstack_copy0 (&objfile->per_bfd->storage_obstack,
18863 base, strlen (base)));
18871 /* Read an attribute value described by an attribute form. */
18873 static const gdb_byte *
18874 read_attribute_value (const struct die_reader_specs *reader,
18875 struct attribute *attr, unsigned form,
18876 LONGEST implicit_const, const gdb_byte *info_ptr)
18878 struct dwarf2_cu *cu = reader->cu;
18879 struct dwarf2_per_objfile *dwarf2_per_objfile
18880 = cu->per_cu->dwarf2_per_objfile;
18881 struct objfile *objfile = dwarf2_per_objfile->objfile;
18882 struct gdbarch *gdbarch = get_objfile_arch (objfile);
18883 bfd *abfd = reader->abfd;
18884 struct comp_unit_head *cu_header = &cu->header;
18885 unsigned int bytes_read;
18886 struct dwarf_block *blk;
18888 attr->form = (enum dwarf_form) form;
18891 case DW_FORM_ref_addr:
18892 if (cu->header.version == 2)
18893 DW_UNSND (attr) = read_address (abfd, info_ptr, cu, &bytes_read);
18895 DW_UNSND (attr) = read_offset (abfd, info_ptr,
18896 &cu->header, &bytes_read);
18897 info_ptr += bytes_read;
18899 case DW_FORM_GNU_ref_alt:
18900 DW_UNSND (attr) = read_offset (abfd, info_ptr, &cu->header, &bytes_read);
18901 info_ptr += bytes_read;
18904 DW_ADDR (attr) = read_address (abfd, info_ptr, cu, &bytes_read);
18905 DW_ADDR (attr) = gdbarch_adjust_dwarf2_addr (gdbarch, DW_ADDR (attr));
18906 info_ptr += bytes_read;
18908 case DW_FORM_block2:
18909 blk = dwarf_alloc_block (cu);
18910 blk->size = read_2_bytes (abfd, info_ptr);
18912 blk->data = read_n_bytes (abfd, info_ptr, blk->size);
18913 info_ptr += blk->size;
18914 DW_BLOCK (attr) = blk;
18916 case DW_FORM_block4:
18917 blk = dwarf_alloc_block (cu);
18918 blk->size = read_4_bytes (abfd, info_ptr);
18920 blk->data = read_n_bytes (abfd, info_ptr, blk->size);
18921 info_ptr += blk->size;
18922 DW_BLOCK (attr) = blk;
18924 case DW_FORM_data2:
18925 DW_UNSND (attr) = read_2_bytes (abfd, info_ptr);
18928 case DW_FORM_data4:
18929 DW_UNSND (attr) = read_4_bytes (abfd, info_ptr);
18932 case DW_FORM_data8:
18933 DW_UNSND (attr) = read_8_bytes (abfd, info_ptr);
18936 case DW_FORM_data16:
18937 blk = dwarf_alloc_block (cu);
18939 blk->data = read_n_bytes (abfd, info_ptr, 16);
18941 DW_BLOCK (attr) = blk;
18943 case DW_FORM_sec_offset:
18944 DW_UNSND (attr) = read_offset (abfd, info_ptr, &cu->header, &bytes_read);
18945 info_ptr += bytes_read;
18947 case DW_FORM_string:
18948 DW_STRING (attr) = read_direct_string (abfd, info_ptr, &bytes_read);
18949 DW_STRING_IS_CANONICAL (attr) = 0;
18950 info_ptr += bytes_read;
18953 if (!cu->per_cu->is_dwz)
18955 DW_STRING (attr) = read_indirect_string (dwarf2_per_objfile,
18956 abfd, info_ptr, cu_header,
18958 DW_STRING_IS_CANONICAL (attr) = 0;
18959 info_ptr += bytes_read;
18963 case DW_FORM_line_strp:
18964 if (!cu->per_cu->is_dwz)
18966 DW_STRING (attr) = read_indirect_line_string (dwarf2_per_objfile,
18968 cu_header, &bytes_read);
18969 DW_STRING_IS_CANONICAL (attr) = 0;
18970 info_ptr += bytes_read;
18974 case DW_FORM_GNU_strp_alt:
18976 struct dwz_file *dwz = dwarf2_get_dwz_file (dwarf2_per_objfile);
18977 LONGEST str_offset = read_offset (abfd, info_ptr, cu_header,
18980 DW_STRING (attr) = read_indirect_string_from_dwz (objfile,
18982 DW_STRING_IS_CANONICAL (attr) = 0;
18983 info_ptr += bytes_read;
18986 case DW_FORM_exprloc:
18987 case DW_FORM_block:
18988 blk = dwarf_alloc_block (cu);
18989 blk->size = read_unsigned_leb128 (abfd, info_ptr, &bytes_read);
18990 info_ptr += bytes_read;
18991 blk->data = read_n_bytes (abfd, info_ptr, blk->size);
18992 info_ptr += blk->size;
18993 DW_BLOCK (attr) = blk;
18995 case DW_FORM_block1:
18996 blk = dwarf_alloc_block (cu);
18997 blk->size = read_1_byte (abfd, info_ptr);
18999 blk->data = read_n_bytes (abfd, info_ptr, blk->size);
19000 info_ptr += blk->size;
19001 DW_BLOCK (attr) = blk;
19003 case DW_FORM_data1:
19004 DW_UNSND (attr) = read_1_byte (abfd, info_ptr);
19008 DW_UNSND (attr) = read_1_byte (abfd, info_ptr);
19011 case DW_FORM_flag_present:
19012 DW_UNSND (attr) = 1;
19014 case DW_FORM_sdata:
19015 DW_SND (attr) = read_signed_leb128 (abfd, info_ptr, &bytes_read);
19016 info_ptr += bytes_read;
19018 case DW_FORM_udata:
19019 DW_UNSND (attr) = read_unsigned_leb128 (abfd, info_ptr, &bytes_read);
19020 info_ptr += bytes_read;
19023 DW_UNSND (attr) = (to_underlying (cu->header.sect_off)
19024 + read_1_byte (abfd, info_ptr));
19028 DW_UNSND (attr) = (to_underlying (cu->header.sect_off)
19029 + read_2_bytes (abfd, info_ptr));
19033 DW_UNSND (attr) = (to_underlying (cu->header.sect_off)
19034 + read_4_bytes (abfd, info_ptr));
19038 DW_UNSND (attr) = (to_underlying (cu->header.sect_off)
19039 + read_8_bytes (abfd, info_ptr));
19042 case DW_FORM_ref_sig8:
19043 DW_SIGNATURE (attr) = read_8_bytes (abfd, info_ptr);
19046 case DW_FORM_ref_udata:
19047 DW_UNSND (attr) = (to_underlying (cu->header.sect_off)
19048 + read_unsigned_leb128 (abfd, info_ptr, &bytes_read));
19049 info_ptr += bytes_read;
19051 case DW_FORM_indirect:
19052 form = read_unsigned_leb128 (abfd, info_ptr, &bytes_read);
19053 info_ptr += bytes_read;
19054 if (form == DW_FORM_implicit_const)
19056 implicit_const = read_signed_leb128 (abfd, info_ptr, &bytes_read);
19057 info_ptr += bytes_read;
19059 info_ptr = read_attribute_value (reader, attr, form, implicit_const,
19062 case DW_FORM_implicit_const:
19063 DW_SND (attr) = implicit_const;
19065 case DW_FORM_GNU_addr_index:
19066 if (reader->dwo_file == NULL)
19068 /* For now flag a hard error.
19069 Later we can turn this into a complaint. */
19070 error (_("Dwarf Error: %s found in non-DWO CU [in module %s]"),
19071 dwarf_form_name (form),
19072 bfd_get_filename (abfd));
19074 DW_ADDR (attr) = read_addr_index_from_leb128 (cu, info_ptr, &bytes_read);
19075 info_ptr += bytes_read;
19077 case DW_FORM_GNU_str_index:
19078 if (reader->dwo_file == NULL)
19080 /* For now flag a hard error.
19081 Later we can turn this into a complaint if warranted. */
19082 error (_("Dwarf Error: %s found in non-DWO CU [in module %s]"),
19083 dwarf_form_name (form),
19084 bfd_get_filename (abfd));
19087 ULONGEST str_index =
19088 read_unsigned_leb128 (abfd, info_ptr, &bytes_read);
19090 DW_STRING (attr) = read_str_index (reader, str_index);
19091 DW_STRING_IS_CANONICAL (attr) = 0;
19092 info_ptr += bytes_read;
19096 error (_("Dwarf Error: Cannot handle %s in DWARF reader [in module %s]"),
19097 dwarf_form_name (form),
19098 bfd_get_filename (abfd));
19102 if (cu->per_cu->is_dwz && attr_form_is_ref (attr))
19103 attr->form = DW_FORM_GNU_ref_alt;
19105 /* We have seen instances where the compiler tried to emit a byte
19106 size attribute of -1 which ended up being encoded as an unsigned
19107 0xffffffff. Although 0xffffffff is technically a valid size value,
19108 an object of this size seems pretty unlikely so we can relatively
19109 safely treat these cases as if the size attribute was invalid and
19110 treat them as zero by default. */
19111 if (attr->name == DW_AT_byte_size
19112 && form == DW_FORM_data4
19113 && DW_UNSND (attr) >= 0xffffffff)
19116 (&symfile_complaints,
19117 _("Suspicious DW_AT_byte_size value treated as zero instead of %s"),
19118 hex_string (DW_UNSND (attr)));
19119 DW_UNSND (attr) = 0;
19125 /* Read an attribute described by an abbreviated attribute. */
19127 static const gdb_byte *
19128 read_attribute (const struct die_reader_specs *reader,
19129 struct attribute *attr, struct attr_abbrev *abbrev,
19130 const gdb_byte *info_ptr)
19132 attr->name = abbrev->name;
19133 return read_attribute_value (reader, attr, abbrev->form,
19134 abbrev->implicit_const, info_ptr);
19137 /* Read dwarf information from a buffer. */
19139 static unsigned int
19140 read_1_byte (bfd *abfd, const gdb_byte *buf)
19142 return bfd_get_8 (abfd, buf);
19146 read_1_signed_byte (bfd *abfd, const gdb_byte *buf)
19148 return bfd_get_signed_8 (abfd, buf);
19151 static unsigned int
19152 read_2_bytes (bfd *abfd, const gdb_byte *buf)
19154 return bfd_get_16 (abfd, buf);
19158 read_2_signed_bytes (bfd *abfd, const gdb_byte *buf)
19160 return bfd_get_signed_16 (abfd, buf);
19163 static unsigned int
19164 read_4_bytes (bfd *abfd, const gdb_byte *buf)
19166 return bfd_get_32 (abfd, buf);
19170 read_4_signed_bytes (bfd *abfd, const gdb_byte *buf)
19172 return bfd_get_signed_32 (abfd, buf);
19176 read_8_bytes (bfd *abfd, const gdb_byte *buf)
19178 return bfd_get_64 (abfd, buf);
19182 read_address (bfd *abfd, const gdb_byte *buf, struct dwarf2_cu *cu,
19183 unsigned int *bytes_read)
19185 struct comp_unit_head *cu_header = &cu->header;
19186 CORE_ADDR retval = 0;
19188 if (cu_header->signed_addr_p)
19190 switch (cu_header->addr_size)
19193 retval = bfd_get_signed_16 (abfd, buf);
19196 retval = bfd_get_signed_32 (abfd, buf);
19199 retval = bfd_get_signed_64 (abfd, buf);
19202 internal_error (__FILE__, __LINE__,
19203 _("read_address: bad switch, signed [in module %s]"),
19204 bfd_get_filename (abfd));
19209 switch (cu_header->addr_size)
19212 retval = bfd_get_16 (abfd, buf);
19215 retval = bfd_get_32 (abfd, buf);
19218 retval = bfd_get_64 (abfd, buf);
19221 internal_error (__FILE__, __LINE__,
19222 _("read_address: bad switch, "
19223 "unsigned [in module %s]"),
19224 bfd_get_filename (abfd));
19228 *bytes_read = cu_header->addr_size;
19232 /* Read the initial length from a section. The (draft) DWARF 3
19233 specification allows the initial length to take up either 4 bytes
19234 or 12 bytes. If the first 4 bytes are 0xffffffff, then the next 8
19235 bytes describe the length and all offsets will be 8 bytes in length
19238 An older, non-standard 64-bit format is also handled by this
19239 function. The older format in question stores the initial length
19240 as an 8-byte quantity without an escape value. Lengths greater
19241 than 2^32 aren't very common which means that the initial 4 bytes
19242 is almost always zero. Since a length value of zero doesn't make
19243 sense for the 32-bit format, this initial zero can be considered to
19244 be an escape value which indicates the presence of the older 64-bit
19245 format. As written, the code can't detect (old format) lengths
19246 greater than 4GB. If it becomes necessary to handle lengths
19247 somewhat larger than 4GB, we could allow other small values (such
19248 as the non-sensical values of 1, 2, and 3) to also be used as
19249 escape values indicating the presence of the old format.
19251 The value returned via bytes_read should be used to increment the
19252 relevant pointer after calling read_initial_length().
19254 [ Note: read_initial_length() and read_offset() are based on the
19255 document entitled "DWARF Debugging Information Format", revision
19256 3, draft 8, dated November 19, 2001. This document was obtained
19259 http://reality.sgiweb.org/davea/dwarf3-draft8-011125.pdf
19261 This document is only a draft and is subject to change. (So beware.)
19263 Details regarding the older, non-standard 64-bit format were
19264 determined empirically by examining 64-bit ELF files produced by
19265 the SGI toolchain on an IRIX 6.5 machine.
19267 - Kevin, July 16, 2002
19271 read_initial_length (bfd *abfd, const gdb_byte *buf, unsigned int *bytes_read)
19273 LONGEST length = bfd_get_32 (abfd, buf);
19275 if (length == 0xffffffff)
19277 length = bfd_get_64 (abfd, buf + 4);
19280 else if (length == 0)
19282 /* Handle the (non-standard) 64-bit DWARF2 format used by IRIX. */
19283 length = bfd_get_64 (abfd, buf);
19294 /* Cover function for read_initial_length.
19295 Returns the length of the object at BUF, and stores the size of the
19296 initial length in *BYTES_READ and stores the size that offsets will be in
19298 If the initial length size is not equivalent to that specified in
19299 CU_HEADER then issue a complaint.
19300 This is useful when reading non-comp-unit headers. */
19303 read_checked_initial_length_and_offset (bfd *abfd, const gdb_byte *buf,
19304 const struct comp_unit_head *cu_header,
19305 unsigned int *bytes_read,
19306 unsigned int *offset_size)
19308 LONGEST length = read_initial_length (abfd, buf, bytes_read);
19310 gdb_assert (cu_header->initial_length_size == 4
19311 || cu_header->initial_length_size == 8
19312 || cu_header->initial_length_size == 12);
19314 if (cu_header->initial_length_size != *bytes_read)
19315 complaint (&symfile_complaints,
19316 _("intermixed 32-bit and 64-bit DWARF sections"));
19318 *offset_size = (*bytes_read == 4) ? 4 : 8;
19322 /* Read an offset from the data stream. The size of the offset is
19323 given by cu_header->offset_size. */
19326 read_offset (bfd *abfd, const gdb_byte *buf,
19327 const struct comp_unit_head *cu_header,
19328 unsigned int *bytes_read)
19330 LONGEST offset = read_offset_1 (abfd, buf, cu_header->offset_size);
19332 *bytes_read = cu_header->offset_size;
19336 /* Read an offset from the data stream. */
19339 read_offset_1 (bfd *abfd, const gdb_byte *buf, unsigned int offset_size)
19341 LONGEST retval = 0;
19343 switch (offset_size)
19346 retval = bfd_get_32 (abfd, buf);
19349 retval = bfd_get_64 (abfd, buf);
19352 internal_error (__FILE__, __LINE__,
19353 _("read_offset_1: bad switch [in module %s]"),
19354 bfd_get_filename (abfd));
19360 static const gdb_byte *
19361 read_n_bytes (bfd *abfd, const gdb_byte *buf, unsigned int size)
19363 /* If the size of a host char is 8 bits, we can return a pointer
19364 to the buffer, otherwise we have to copy the data to a buffer
19365 allocated on the temporary obstack. */
19366 gdb_assert (HOST_CHAR_BIT == 8);
19370 static const char *
19371 read_direct_string (bfd *abfd, const gdb_byte *buf,
19372 unsigned int *bytes_read_ptr)
19374 /* If the size of a host char is 8 bits, we can return a pointer
19375 to the string, otherwise we have to copy the string to a buffer
19376 allocated on the temporary obstack. */
19377 gdb_assert (HOST_CHAR_BIT == 8);
19380 *bytes_read_ptr = 1;
19383 *bytes_read_ptr = strlen ((const char *) buf) + 1;
19384 return (const char *) buf;
19387 /* Return pointer to string at section SECT offset STR_OFFSET with error
19388 reporting strings FORM_NAME and SECT_NAME. */
19390 static const char *
19391 read_indirect_string_at_offset_from (struct objfile *objfile,
19392 bfd *abfd, LONGEST str_offset,
19393 struct dwarf2_section_info *sect,
19394 const char *form_name,
19395 const char *sect_name)
19397 dwarf2_read_section (objfile, sect);
19398 if (sect->buffer == NULL)
19399 error (_("%s used without %s section [in module %s]"),
19400 form_name, sect_name, bfd_get_filename (abfd));
19401 if (str_offset >= sect->size)
19402 error (_("%s pointing outside of %s section [in module %s]"),
19403 form_name, sect_name, bfd_get_filename (abfd));
19404 gdb_assert (HOST_CHAR_BIT == 8);
19405 if (sect->buffer[str_offset] == '\0')
19407 return (const char *) (sect->buffer + str_offset);
19410 /* Return pointer to string at .debug_str offset STR_OFFSET. */
19412 static const char *
19413 read_indirect_string_at_offset (struct dwarf2_per_objfile *dwarf2_per_objfile,
19414 bfd *abfd, LONGEST str_offset)
19416 return read_indirect_string_at_offset_from (dwarf2_per_objfile->objfile,
19418 &dwarf2_per_objfile->str,
19419 "DW_FORM_strp", ".debug_str");
19422 /* Return pointer to string at .debug_line_str offset STR_OFFSET. */
19424 static const char *
19425 read_indirect_line_string_at_offset (struct dwarf2_per_objfile *dwarf2_per_objfile,
19426 bfd *abfd, LONGEST str_offset)
19428 return read_indirect_string_at_offset_from (dwarf2_per_objfile->objfile,
19430 &dwarf2_per_objfile->line_str,
19431 "DW_FORM_line_strp",
19432 ".debug_line_str");
19435 /* Read a string at offset STR_OFFSET in the .debug_str section from
19436 the .dwz file DWZ. Throw an error if the offset is too large. If
19437 the string consists of a single NUL byte, return NULL; otherwise
19438 return a pointer to the string. */
19440 static const char *
19441 read_indirect_string_from_dwz (struct objfile *objfile, struct dwz_file *dwz,
19442 LONGEST str_offset)
19444 dwarf2_read_section (objfile, &dwz->str);
19446 if (dwz->str.buffer == NULL)
19447 error (_("DW_FORM_GNU_strp_alt used without .debug_str "
19448 "section [in module %s]"),
19449 bfd_get_filename (dwz->dwz_bfd));
19450 if (str_offset >= dwz->str.size)
19451 error (_("DW_FORM_GNU_strp_alt pointing outside of "
19452 ".debug_str section [in module %s]"),
19453 bfd_get_filename (dwz->dwz_bfd));
19454 gdb_assert (HOST_CHAR_BIT == 8);
19455 if (dwz->str.buffer[str_offset] == '\0')
19457 return (const char *) (dwz->str.buffer + str_offset);
19460 /* Return pointer to string at .debug_str offset as read from BUF.
19461 BUF is assumed to be in a compilation unit described by CU_HEADER.
19462 Return *BYTES_READ_PTR count of bytes read from BUF. */
19464 static const char *
19465 read_indirect_string (struct dwarf2_per_objfile *dwarf2_per_objfile, bfd *abfd,
19466 const gdb_byte *buf,
19467 const struct comp_unit_head *cu_header,
19468 unsigned int *bytes_read_ptr)
19470 LONGEST str_offset = read_offset (abfd, buf, cu_header, bytes_read_ptr);
19472 return read_indirect_string_at_offset (dwarf2_per_objfile, abfd, str_offset);
19475 /* Return pointer to string at .debug_line_str offset as read from BUF.
19476 BUF is assumed to be in a compilation unit described by CU_HEADER.
19477 Return *BYTES_READ_PTR count of bytes read from BUF. */
19479 static const char *
19480 read_indirect_line_string (struct dwarf2_per_objfile *dwarf2_per_objfile,
19481 bfd *abfd, const gdb_byte *buf,
19482 const struct comp_unit_head *cu_header,
19483 unsigned int *bytes_read_ptr)
19485 LONGEST str_offset = read_offset (abfd, buf, cu_header, bytes_read_ptr);
19487 return read_indirect_line_string_at_offset (dwarf2_per_objfile, abfd,
19492 read_unsigned_leb128 (bfd *abfd, const gdb_byte *buf,
19493 unsigned int *bytes_read_ptr)
19496 unsigned int num_read;
19498 unsigned char byte;
19505 byte = bfd_get_8 (abfd, buf);
19508 result |= ((ULONGEST) (byte & 127) << shift);
19509 if ((byte & 128) == 0)
19515 *bytes_read_ptr = num_read;
19520 read_signed_leb128 (bfd *abfd, const gdb_byte *buf,
19521 unsigned int *bytes_read_ptr)
19524 int shift, num_read;
19525 unsigned char byte;
19532 byte = bfd_get_8 (abfd, buf);
19535 result |= ((LONGEST) (byte & 127) << shift);
19537 if ((byte & 128) == 0)
19542 if ((shift < 8 * sizeof (result)) && (byte & 0x40))
19543 result |= -(((LONGEST) 1) << shift);
19544 *bytes_read_ptr = num_read;
19548 /* Given index ADDR_INDEX in .debug_addr, fetch the value.
19549 ADDR_BASE is the DW_AT_GNU_addr_base attribute or zero.
19550 ADDR_SIZE is the size of addresses from the CU header. */
19553 read_addr_index_1 (struct dwarf2_per_objfile *dwarf2_per_objfile,
19554 unsigned int addr_index, ULONGEST addr_base, int addr_size)
19556 struct objfile *objfile = dwarf2_per_objfile->objfile;
19557 bfd *abfd = objfile->obfd;
19558 const gdb_byte *info_ptr;
19560 dwarf2_read_section (objfile, &dwarf2_per_objfile->addr);
19561 if (dwarf2_per_objfile->addr.buffer == NULL)
19562 error (_("DW_FORM_addr_index used without .debug_addr section [in module %s]"),
19563 objfile_name (objfile));
19564 if (addr_base + addr_index * addr_size >= dwarf2_per_objfile->addr.size)
19565 error (_("DW_FORM_addr_index pointing outside of "
19566 ".debug_addr section [in module %s]"),
19567 objfile_name (objfile));
19568 info_ptr = (dwarf2_per_objfile->addr.buffer
19569 + addr_base + addr_index * addr_size);
19570 if (addr_size == 4)
19571 return bfd_get_32 (abfd, info_ptr);
19573 return bfd_get_64 (abfd, info_ptr);
19576 /* Given index ADDR_INDEX in .debug_addr, fetch the value. */
19579 read_addr_index (struct dwarf2_cu *cu, unsigned int addr_index)
19581 return read_addr_index_1 (cu->per_cu->dwarf2_per_objfile, addr_index,
19582 cu->addr_base, cu->header.addr_size);
19585 /* Given a pointer to an leb128 value, fetch the value from .debug_addr. */
19588 read_addr_index_from_leb128 (struct dwarf2_cu *cu, const gdb_byte *info_ptr,
19589 unsigned int *bytes_read)
19591 bfd *abfd = cu->per_cu->dwarf2_per_objfile->objfile->obfd;
19592 unsigned int addr_index = read_unsigned_leb128 (abfd, info_ptr, bytes_read);
19594 return read_addr_index (cu, addr_index);
19597 /* Data structure to pass results from dwarf2_read_addr_index_reader
19598 back to dwarf2_read_addr_index. */
19600 struct dwarf2_read_addr_index_data
19602 ULONGEST addr_base;
19606 /* die_reader_func for dwarf2_read_addr_index. */
19609 dwarf2_read_addr_index_reader (const struct die_reader_specs *reader,
19610 const gdb_byte *info_ptr,
19611 struct die_info *comp_unit_die,
19615 struct dwarf2_cu *cu = reader->cu;
19616 struct dwarf2_read_addr_index_data *aidata =
19617 (struct dwarf2_read_addr_index_data *) data;
19619 aidata->addr_base = cu->addr_base;
19620 aidata->addr_size = cu->header.addr_size;
19623 /* Given an index in .debug_addr, fetch the value.
19624 NOTE: This can be called during dwarf expression evaluation,
19625 long after the debug information has been read, and thus per_cu->cu
19626 may no longer exist. */
19629 dwarf2_read_addr_index (struct dwarf2_per_cu_data *per_cu,
19630 unsigned int addr_index)
19632 struct dwarf2_per_objfile *dwarf2_per_objfile = per_cu->dwarf2_per_objfile;
19633 struct dwarf2_cu *cu = per_cu->cu;
19634 ULONGEST addr_base;
19637 /* We need addr_base and addr_size.
19638 If we don't have PER_CU->cu, we have to get it.
19639 Nasty, but the alternative is storing the needed info in PER_CU,
19640 which at this point doesn't seem justified: it's not clear how frequently
19641 it would get used and it would increase the size of every PER_CU.
19642 Entry points like dwarf2_per_cu_addr_size do a similar thing
19643 so we're not in uncharted territory here.
19644 Alas we need to be a bit more complicated as addr_base is contained
19647 We don't need to read the entire CU(/TU).
19648 We just need the header and top level die.
19650 IWBN to use the aging mechanism to let us lazily later discard the CU.
19651 For now we skip this optimization. */
19655 addr_base = cu->addr_base;
19656 addr_size = cu->header.addr_size;
19660 struct dwarf2_read_addr_index_data aidata;
19662 /* Note: We can't use init_cutu_and_read_dies_simple here,
19663 we need addr_base. */
19664 init_cutu_and_read_dies (per_cu, NULL, 0, 0,
19665 dwarf2_read_addr_index_reader, &aidata);
19666 addr_base = aidata.addr_base;
19667 addr_size = aidata.addr_size;
19670 return read_addr_index_1 (dwarf2_per_objfile, addr_index, addr_base,
19674 /* Given a DW_FORM_GNU_str_index, fetch the string.
19675 This is only used by the Fission support. */
19677 static const char *
19678 read_str_index (const struct die_reader_specs *reader, ULONGEST str_index)
19680 struct dwarf2_cu *cu = reader->cu;
19681 struct dwarf2_per_objfile *dwarf2_per_objfile
19682 = cu->per_cu->dwarf2_per_objfile;
19683 struct objfile *objfile = dwarf2_per_objfile->objfile;
19684 const char *objf_name = objfile_name (objfile);
19685 bfd *abfd = objfile->obfd;
19686 struct dwarf2_section_info *str_section = &reader->dwo_file->sections.str;
19687 struct dwarf2_section_info *str_offsets_section =
19688 &reader->dwo_file->sections.str_offsets;
19689 const gdb_byte *info_ptr;
19690 ULONGEST str_offset;
19691 static const char form_name[] = "DW_FORM_GNU_str_index";
19693 dwarf2_read_section (objfile, str_section);
19694 dwarf2_read_section (objfile, str_offsets_section);
19695 if (str_section->buffer == NULL)
19696 error (_("%s used without .debug_str.dwo section"
19697 " in CU at offset %s [in module %s]"),
19698 form_name, sect_offset_str (cu->header.sect_off), objf_name);
19699 if (str_offsets_section->buffer == NULL)
19700 error (_("%s used without .debug_str_offsets.dwo section"
19701 " in CU at offset %s [in module %s]"),
19702 form_name, sect_offset_str (cu->header.sect_off), objf_name);
19703 if (str_index * cu->header.offset_size >= str_offsets_section->size)
19704 error (_("%s pointing outside of .debug_str_offsets.dwo"
19705 " section in CU at offset %s [in module %s]"),
19706 form_name, sect_offset_str (cu->header.sect_off), objf_name);
19707 info_ptr = (str_offsets_section->buffer
19708 + str_index * cu->header.offset_size);
19709 if (cu->header.offset_size == 4)
19710 str_offset = bfd_get_32 (abfd, info_ptr);
19712 str_offset = bfd_get_64 (abfd, info_ptr);
19713 if (str_offset >= str_section->size)
19714 error (_("Offset from %s pointing outside of"
19715 " .debug_str.dwo section in CU at offset %s [in module %s]"),
19716 form_name, sect_offset_str (cu->header.sect_off), objf_name);
19717 return (const char *) (str_section->buffer + str_offset);
19720 /* Return the length of an LEB128 number in BUF. */
19723 leb128_size (const gdb_byte *buf)
19725 const gdb_byte *begin = buf;
19731 if ((byte & 128) == 0)
19732 return buf - begin;
19737 set_cu_language (unsigned int lang, struct dwarf2_cu *cu)
19746 cu->language = language_c;
19749 case DW_LANG_C_plus_plus:
19750 case DW_LANG_C_plus_plus_11:
19751 case DW_LANG_C_plus_plus_14:
19752 cu->language = language_cplus;
19755 cu->language = language_d;
19757 case DW_LANG_Fortran77:
19758 case DW_LANG_Fortran90:
19759 case DW_LANG_Fortran95:
19760 case DW_LANG_Fortran03:
19761 case DW_LANG_Fortran08:
19762 cu->language = language_fortran;
19765 cu->language = language_go;
19767 case DW_LANG_Mips_Assembler:
19768 cu->language = language_asm;
19770 case DW_LANG_Ada83:
19771 case DW_LANG_Ada95:
19772 cu->language = language_ada;
19774 case DW_LANG_Modula2:
19775 cu->language = language_m2;
19777 case DW_LANG_Pascal83:
19778 cu->language = language_pascal;
19781 cu->language = language_objc;
19784 case DW_LANG_Rust_old:
19785 cu->language = language_rust;
19787 case DW_LANG_Cobol74:
19788 case DW_LANG_Cobol85:
19790 cu->language = language_minimal;
19793 cu->language_defn = language_def (cu->language);
19796 /* Return the named attribute or NULL if not there. */
19798 static struct attribute *
19799 dwarf2_attr (struct die_info *die, unsigned int name, struct dwarf2_cu *cu)
19804 struct attribute *spec = NULL;
19806 for (i = 0; i < die->num_attrs; ++i)
19808 if (die->attrs[i].name == name)
19809 return &die->attrs[i];
19810 if (die->attrs[i].name == DW_AT_specification
19811 || die->attrs[i].name == DW_AT_abstract_origin)
19812 spec = &die->attrs[i];
19818 die = follow_die_ref (die, spec, &cu);
19824 /* Return the named attribute or NULL if not there,
19825 but do not follow DW_AT_specification, etc.
19826 This is for use in contexts where we're reading .debug_types dies.
19827 Following DW_AT_specification, DW_AT_abstract_origin will take us
19828 back up the chain, and we want to go down. */
19830 static struct attribute *
19831 dwarf2_attr_no_follow (struct die_info *die, unsigned int name)
19835 for (i = 0; i < die->num_attrs; ++i)
19836 if (die->attrs[i].name == name)
19837 return &die->attrs[i];
19842 /* Return the string associated with a string-typed attribute, or NULL if it
19843 is either not found or is of an incorrect type. */
19845 static const char *
19846 dwarf2_string_attr (struct die_info *die, unsigned int name, struct dwarf2_cu *cu)
19848 struct attribute *attr;
19849 const char *str = NULL;
19851 attr = dwarf2_attr (die, name, cu);
19855 if (attr->form == DW_FORM_strp || attr->form == DW_FORM_line_strp
19856 || attr->form == DW_FORM_string
19857 || attr->form == DW_FORM_GNU_str_index
19858 || attr->form == DW_FORM_GNU_strp_alt)
19859 str = DW_STRING (attr);
19861 complaint (&symfile_complaints,
19862 _("string type expected for attribute %s for "
19863 "DIE at %s in module %s"),
19864 dwarf_attr_name (name), sect_offset_str (die->sect_off),
19865 objfile_name (cu->per_cu->dwarf2_per_objfile->objfile));
19871 /* Return non-zero iff the attribute NAME is defined for the given DIE,
19872 and holds a non-zero value. This function should only be used for
19873 DW_FORM_flag or DW_FORM_flag_present attributes. */
19876 dwarf2_flag_true_p (struct die_info *die, unsigned name, struct dwarf2_cu *cu)
19878 struct attribute *attr = dwarf2_attr (die, name, cu);
19880 return (attr && DW_UNSND (attr));
19884 die_is_declaration (struct die_info *die, struct dwarf2_cu *cu)
19886 /* A DIE is a declaration if it has a DW_AT_declaration attribute
19887 which value is non-zero. However, we have to be careful with
19888 DIEs having a DW_AT_specification attribute, because dwarf2_attr()
19889 (via dwarf2_flag_true_p) follows this attribute. So we may
19890 end up accidently finding a declaration attribute that belongs
19891 to a different DIE referenced by the specification attribute,
19892 even though the given DIE does not have a declaration attribute. */
19893 return (dwarf2_flag_true_p (die, DW_AT_declaration, cu)
19894 && dwarf2_attr (die, DW_AT_specification, cu) == NULL);
19897 /* Return the die giving the specification for DIE, if there is
19898 one. *SPEC_CU is the CU containing DIE on input, and the CU
19899 containing the return value on output. If there is no
19900 specification, but there is an abstract origin, that is
19903 static struct die_info *
19904 die_specification (struct die_info *die, struct dwarf2_cu **spec_cu)
19906 struct attribute *spec_attr = dwarf2_attr (die, DW_AT_specification,
19909 if (spec_attr == NULL)
19910 spec_attr = dwarf2_attr (die, DW_AT_abstract_origin, *spec_cu);
19912 if (spec_attr == NULL)
19915 return follow_die_ref (die, spec_attr, spec_cu);
19918 /* Stub for free_line_header to match void * callback types. */
19921 free_line_header_voidp (void *arg)
19923 struct line_header *lh = (struct line_header *) arg;
19929 line_header::add_include_dir (const char *include_dir)
19931 if (dwarf_line_debug >= 2)
19932 fprintf_unfiltered (gdb_stdlog, "Adding dir %zu: %s\n",
19933 include_dirs.size () + 1, include_dir);
19935 include_dirs.push_back (include_dir);
19939 line_header::add_file_name (const char *name,
19941 unsigned int mod_time,
19942 unsigned int length)
19944 if (dwarf_line_debug >= 2)
19945 fprintf_unfiltered (gdb_stdlog, "Adding file %u: %s\n",
19946 (unsigned) file_names.size () + 1, name);
19948 file_names.emplace_back (name, d_index, mod_time, length);
19951 /* A convenience function to find the proper .debug_line section for a CU. */
19953 static struct dwarf2_section_info *
19954 get_debug_line_section (struct dwarf2_cu *cu)
19956 struct dwarf2_section_info *section;
19957 struct dwarf2_per_objfile *dwarf2_per_objfile
19958 = cu->per_cu->dwarf2_per_objfile;
19960 /* For TUs in DWO files, the DW_AT_stmt_list attribute lives in the
19962 if (cu->dwo_unit && cu->per_cu->is_debug_types)
19963 section = &cu->dwo_unit->dwo_file->sections.line;
19964 else if (cu->per_cu->is_dwz)
19966 struct dwz_file *dwz = dwarf2_get_dwz_file (dwarf2_per_objfile);
19968 section = &dwz->line;
19971 section = &dwarf2_per_objfile->line;
19976 /* Read directory or file name entry format, starting with byte of
19977 format count entries, ULEB128 pairs of entry formats, ULEB128 of
19978 entries count and the entries themselves in the described entry
19982 read_formatted_entries (struct dwarf2_per_objfile *dwarf2_per_objfile,
19983 bfd *abfd, const gdb_byte **bufp,
19984 struct line_header *lh,
19985 const struct comp_unit_head *cu_header,
19986 void (*callback) (struct line_header *lh,
19989 unsigned int mod_time,
19990 unsigned int length))
19992 gdb_byte format_count, formati;
19993 ULONGEST data_count, datai;
19994 const gdb_byte *buf = *bufp;
19995 const gdb_byte *format_header_data;
19996 unsigned int bytes_read;
19998 format_count = read_1_byte (abfd, buf);
20000 format_header_data = buf;
20001 for (formati = 0; formati < format_count; formati++)
20003 read_unsigned_leb128 (abfd, buf, &bytes_read);
20005 read_unsigned_leb128 (abfd, buf, &bytes_read);
20009 data_count = read_unsigned_leb128 (abfd, buf, &bytes_read);
20011 for (datai = 0; datai < data_count; datai++)
20013 const gdb_byte *format = format_header_data;
20014 struct file_entry fe;
20016 for (formati = 0; formati < format_count; formati++)
20018 ULONGEST content_type = read_unsigned_leb128 (abfd, format, &bytes_read);
20019 format += bytes_read;
20021 ULONGEST form = read_unsigned_leb128 (abfd, format, &bytes_read);
20022 format += bytes_read;
20024 gdb::optional<const char *> string;
20025 gdb::optional<unsigned int> uint;
20029 case DW_FORM_string:
20030 string.emplace (read_direct_string (abfd, buf, &bytes_read));
20034 case DW_FORM_line_strp:
20035 string.emplace (read_indirect_line_string (dwarf2_per_objfile,
20042 case DW_FORM_data1:
20043 uint.emplace (read_1_byte (abfd, buf));
20047 case DW_FORM_data2:
20048 uint.emplace (read_2_bytes (abfd, buf));
20052 case DW_FORM_data4:
20053 uint.emplace (read_4_bytes (abfd, buf));
20057 case DW_FORM_data8:
20058 uint.emplace (read_8_bytes (abfd, buf));
20062 case DW_FORM_udata:
20063 uint.emplace (read_unsigned_leb128 (abfd, buf, &bytes_read));
20067 case DW_FORM_block:
20068 /* It is valid only for DW_LNCT_timestamp which is ignored by
20073 switch (content_type)
20076 if (string.has_value ())
20079 case DW_LNCT_directory_index:
20080 if (uint.has_value ())
20081 fe.d_index = (dir_index) *uint;
20083 case DW_LNCT_timestamp:
20084 if (uint.has_value ())
20085 fe.mod_time = *uint;
20088 if (uint.has_value ())
20094 complaint (&symfile_complaints,
20095 _("Unknown format content type %s"),
20096 pulongest (content_type));
20100 callback (lh, fe.name, fe.d_index, fe.mod_time, fe.length);
20106 /* Read the statement program header starting at OFFSET in
20107 .debug_line, or .debug_line.dwo. Return a pointer
20108 to a struct line_header, allocated using xmalloc.
20109 Returns NULL if there is a problem reading the header, e.g., if it
20110 has a version we don't understand.
20112 NOTE: the strings in the include directory and file name tables of
20113 the returned object point into the dwarf line section buffer,
20114 and must not be freed. */
20116 static line_header_up
20117 dwarf_decode_line_header (sect_offset sect_off, struct dwarf2_cu *cu)
20119 const gdb_byte *line_ptr;
20120 unsigned int bytes_read, offset_size;
20122 const char *cur_dir, *cur_file;
20123 struct dwarf2_section_info *section;
20125 struct dwarf2_per_objfile *dwarf2_per_objfile
20126 = cu->per_cu->dwarf2_per_objfile;
20128 section = get_debug_line_section (cu);
20129 dwarf2_read_section (dwarf2_per_objfile->objfile, section);
20130 if (section->buffer == NULL)
20132 if (cu->dwo_unit && cu->per_cu->is_debug_types)
20133 complaint (&symfile_complaints, _("missing .debug_line.dwo section"));
20135 complaint (&symfile_complaints, _("missing .debug_line section"));
20139 /* We can't do this until we know the section is non-empty.
20140 Only then do we know we have such a section. */
20141 abfd = get_section_bfd_owner (section);
20143 /* Make sure that at least there's room for the total_length field.
20144 That could be 12 bytes long, but we're just going to fudge that. */
20145 if (to_underlying (sect_off) + 4 >= section->size)
20147 dwarf2_statement_list_fits_in_line_number_section_complaint ();
20151 line_header_up lh (new line_header ());
20153 lh->sect_off = sect_off;
20154 lh->offset_in_dwz = cu->per_cu->is_dwz;
20156 line_ptr = section->buffer + to_underlying (sect_off);
20158 /* Read in the header. */
20160 read_checked_initial_length_and_offset (abfd, line_ptr, &cu->header,
20161 &bytes_read, &offset_size);
20162 line_ptr += bytes_read;
20163 if (line_ptr + lh->total_length > (section->buffer + section->size))
20165 dwarf2_statement_list_fits_in_line_number_section_complaint ();
20168 lh->statement_program_end = line_ptr + lh->total_length;
20169 lh->version = read_2_bytes (abfd, line_ptr);
20171 if (lh->version > 5)
20173 /* This is a version we don't understand. The format could have
20174 changed in ways we don't handle properly so just punt. */
20175 complaint (&symfile_complaints,
20176 _("unsupported version in .debug_line section"));
20179 if (lh->version >= 5)
20181 gdb_byte segment_selector_size;
20183 /* Skip address size. */
20184 read_1_byte (abfd, line_ptr);
20187 segment_selector_size = read_1_byte (abfd, line_ptr);
20189 if (segment_selector_size != 0)
20191 complaint (&symfile_complaints,
20192 _("unsupported segment selector size %u "
20193 "in .debug_line section"),
20194 segment_selector_size);
20198 lh->header_length = read_offset_1 (abfd, line_ptr, offset_size);
20199 line_ptr += offset_size;
20200 lh->minimum_instruction_length = read_1_byte (abfd, line_ptr);
20202 if (lh->version >= 4)
20204 lh->maximum_ops_per_instruction = read_1_byte (abfd, line_ptr);
20208 lh->maximum_ops_per_instruction = 1;
20210 if (lh->maximum_ops_per_instruction == 0)
20212 lh->maximum_ops_per_instruction = 1;
20213 complaint (&symfile_complaints,
20214 _("invalid maximum_ops_per_instruction "
20215 "in `.debug_line' section"));
20218 lh->default_is_stmt = read_1_byte (abfd, line_ptr);
20220 lh->line_base = read_1_signed_byte (abfd, line_ptr);
20222 lh->line_range = read_1_byte (abfd, line_ptr);
20224 lh->opcode_base = read_1_byte (abfd, line_ptr);
20226 lh->standard_opcode_lengths.reset (new unsigned char[lh->opcode_base]);
20228 lh->standard_opcode_lengths[0] = 1; /* This should never be used anyway. */
20229 for (i = 1; i < lh->opcode_base; ++i)
20231 lh->standard_opcode_lengths[i] = read_1_byte (abfd, line_ptr);
20235 if (lh->version >= 5)
20237 /* Read directory table. */
20238 read_formatted_entries (dwarf2_per_objfile, abfd, &line_ptr, lh.get (),
20240 [] (struct line_header *lh, const char *name,
20241 dir_index d_index, unsigned int mod_time,
20242 unsigned int length)
20244 lh->add_include_dir (name);
20247 /* Read file name table. */
20248 read_formatted_entries (dwarf2_per_objfile, abfd, &line_ptr, lh.get (),
20250 [] (struct line_header *lh, const char *name,
20251 dir_index d_index, unsigned int mod_time,
20252 unsigned int length)
20254 lh->add_file_name (name, d_index, mod_time, length);
20259 /* Read directory table. */
20260 while ((cur_dir = read_direct_string (abfd, line_ptr, &bytes_read)) != NULL)
20262 line_ptr += bytes_read;
20263 lh->add_include_dir (cur_dir);
20265 line_ptr += bytes_read;
20267 /* Read file name table. */
20268 while ((cur_file = read_direct_string (abfd, line_ptr, &bytes_read)) != NULL)
20270 unsigned int mod_time, length;
20273 line_ptr += bytes_read;
20274 d_index = (dir_index) read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
20275 line_ptr += bytes_read;
20276 mod_time = read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
20277 line_ptr += bytes_read;
20278 length = read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
20279 line_ptr += bytes_read;
20281 lh->add_file_name (cur_file, d_index, mod_time, length);
20283 line_ptr += bytes_read;
20285 lh->statement_program_start = line_ptr;
20287 if (line_ptr > (section->buffer + section->size))
20288 complaint (&symfile_complaints,
20289 _("line number info header doesn't "
20290 "fit in `.debug_line' section"));
20295 /* Subroutine of dwarf_decode_lines to simplify it.
20296 Return the file name of the psymtab for included file FILE_INDEX
20297 in line header LH of PST.
20298 COMP_DIR is the compilation directory (DW_AT_comp_dir) or NULL if unknown.
20299 If space for the result is malloc'd, *NAME_HOLDER will be set.
20300 Returns NULL if FILE_INDEX should be ignored, i.e., it is pst->filename. */
20302 static const char *
20303 psymtab_include_file_name (const struct line_header *lh, int file_index,
20304 const struct partial_symtab *pst,
20305 const char *comp_dir,
20306 gdb::unique_xmalloc_ptr<char> *name_holder)
20308 const file_entry &fe = lh->file_names[file_index];
20309 const char *include_name = fe.name;
20310 const char *include_name_to_compare = include_name;
20311 const char *pst_filename;
20314 const char *dir_name = fe.include_dir (lh);
20316 gdb::unique_xmalloc_ptr<char> hold_compare;
20317 if (!IS_ABSOLUTE_PATH (include_name)
20318 && (dir_name != NULL || comp_dir != NULL))
20320 /* Avoid creating a duplicate psymtab for PST.
20321 We do this by comparing INCLUDE_NAME and PST_FILENAME.
20322 Before we do the comparison, however, we need to account
20323 for DIR_NAME and COMP_DIR.
20324 First prepend dir_name (if non-NULL). If we still don't
20325 have an absolute path prepend comp_dir (if non-NULL).
20326 However, the directory we record in the include-file's
20327 psymtab does not contain COMP_DIR (to match the
20328 corresponding symtab(s)).
20333 bash$ gcc -g ./hello.c
20334 include_name = "hello.c"
20336 DW_AT_comp_dir = comp_dir = "/tmp"
20337 DW_AT_name = "./hello.c"
20341 if (dir_name != NULL)
20343 name_holder->reset (concat (dir_name, SLASH_STRING,
20344 include_name, (char *) NULL));
20345 include_name = name_holder->get ();
20346 include_name_to_compare = include_name;
20348 if (!IS_ABSOLUTE_PATH (include_name) && comp_dir != NULL)
20350 hold_compare.reset (concat (comp_dir, SLASH_STRING,
20351 include_name, (char *) NULL));
20352 include_name_to_compare = hold_compare.get ();
20356 pst_filename = pst->filename;
20357 gdb::unique_xmalloc_ptr<char> copied_name;
20358 if (!IS_ABSOLUTE_PATH (pst_filename) && pst->dirname != NULL)
20360 copied_name.reset (concat (pst->dirname, SLASH_STRING,
20361 pst_filename, (char *) NULL));
20362 pst_filename = copied_name.get ();
20365 file_is_pst = FILENAME_CMP (include_name_to_compare, pst_filename) == 0;
20369 return include_name;
20372 /* State machine to track the state of the line number program. */
20374 class lnp_state_machine
20377 /* Initialize a machine state for the start of a line number
20379 lnp_state_machine (gdbarch *arch, line_header *lh, bool record_lines_p);
20381 file_entry *current_file ()
20383 /* lh->file_names is 0-based, but the file name numbers in the
20384 statement program are 1-based. */
20385 return m_line_header->file_name_at (m_file);
20388 /* Record the line in the state machine. END_SEQUENCE is true if
20389 we're processing the end of a sequence. */
20390 void record_line (bool end_sequence);
20392 /* Check address and if invalid nop-out the rest of the lines in this
20394 void check_line_address (struct dwarf2_cu *cu,
20395 const gdb_byte *line_ptr,
20396 CORE_ADDR lowpc, CORE_ADDR address);
20398 void handle_set_discriminator (unsigned int discriminator)
20400 m_discriminator = discriminator;
20401 m_line_has_non_zero_discriminator |= discriminator != 0;
20404 /* Handle DW_LNE_set_address. */
20405 void handle_set_address (CORE_ADDR baseaddr, CORE_ADDR address)
20408 address += baseaddr;
20409 m_address = gdbarch_adjust_dwarf2_line (m_gdbarch, address, false);
20412 /* Handle DW_LNS_advance_pc. */
20413 void handle_advance_pc (CORE_ADDR adjust);
20415 /* Handle a special opcode. */
20416 void handle_special_opcode (unsigned char op_code);
20418 /* Handle DW_LNS_advance_line. */
20419 void handle_advance_line (int line_delta)
20421 advance_line (line_delta);
20424 /* Handle DW_LNS_set_file. */
20425 void handle_set_file (file_name_index file);
20427 /* Handle DW_LNS_negate_stmt. */
20428 void handle_negate_stmt ()
20430 m_is_stmt = !m_is_stmt;
20433 /* Handle DW_LNS_const_add_pc. */
20434 void handle_const_add_pc ();
20436 /* Handle DW_LNS_fixed_advance_pc. */
20437 void handle_fixed_advance_pc (CORE_ADDR addr_adj)
20439 m_address += gdbarch_adjust_dwarf2_line (m_gdbarch, addr_adj, true);
20443 /* Handle DW_LNS_copy. */
20444 void handle_copy ()
20446 record_line (false);
20447 m_discriminator = 0;
20450 /* Handle DW_LNE_end_sequence. */
20451 void handle_end_sequence ()
20453 m_record_line_callback = ::record_line;
20457 /* Advance the line by LINE_DELTA. */
20458 void advance_line (int line_delta)
20460 m_line += line_delta;
20462 if (line_delta != 0)
20463 m_line_has_non_zero_discriminator = m_discriminator != 0;
20466 gdbarch *m_gdbarch;
20468 /* True if we're recording lines.
20469 Otherwise we're building partial symtabs and are just interested in
20470 finding include files mentioned by the line number program. */
20471 bool m_record_lines_p;
20473 /* The line number header. */
20474 line_header *m_line_header;
20476 /* These are part of the standard DWARF line number state machine,
20477 and initialized according to the DWARF spec. */
20479 unsigned char m_op_index = 0;
20480 /* The line table index (1-based) of the current file. */
20481 file_name_index m_file = (file_name_index) 1;
20482 unsigned int m_line = 1;
20484 /* These are initialized in the constructor. */
20486 CORE_ADDR m_address;
20488 unsigned int m_discriminator;
20490 /* Additional bits of state we need to track. */
20492 /* The last file that we called dwarf2_start_subfile for.
20493 This is only used for TLLs. */
20494 unsigned int m_last_file = 0;
20495 /* The last file a line number was recorded for. */
20496 struct subfile *m_last_subfile = NULL;
20498 /* The function to call to record a line. */
20499 record_line_ftype *m_record_line_callback = NULL;
20501 /* The last line number that was recorded, used to coalesce
20502 consecutive entries for the same line. This can happen, for
20503 example, when discriminators are present. PR 17276. */
20504 unsigned int m_last_line = 0;
20505 bool m_line_has_non_zero_discriminator = false;
20509 lnp_state_machine::handle_advance_pc (CORE_ADDR adjust)
20511 CORE_ADDR addr_adj = (((m_op_index + adjust)
20512 / m_line_header->maximum_ops_per_instruction)
20513 * 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);
20520 lnp_state_machine::handle_special_opcode (unsigned char op_code)
20522 unsigned char adj_opcode = op_code - m_line_header->opcode_base;
20523 CORE_ADDR addr_adj = (((m_op_index
20524 + (adj_opcode / m_line_header->line_range))
20525 / m_line_header->maximum_ops_per_instruction)
20526 * m_line_header->minimum_instruction_length);
20527 m_address += gdbarch_adjust_dwarf2_line (m_gdbarch, addr_adj, true);
20528 m_op_index = ((m_op_index + (adj_opcode / m_line_header->line_range))
20529 % m_line_header->maximum_ops_per_instruction);
20531 int line_delta = (m_line_header->line_base
20532 + (adj_opcode % m_line_header->line_range));
20533 advance_line (line_delta);
20534 record_line (false);
20535 m_discriminator = 0;
20539 lnp_state_machine::handle_set_file (file_name_index file)
20543 const file_entry *fe = current_file ();
20545 dwarf2_debug_line_missing_file_complaint ();
20546 else if (m_record_lines_p)
20548 const char *dir = fe->include_dir (m_line_header);
20550 m_last_subfile = current_subfile;
20551 m_line_has_non_zero_discriminator = m_discriminator != 0;
20552 dwarf2_start_subfile (fe->name, dir);
20557 lnp_state_machine::handle_const_add_pc ()
20560 = (255 - m_line_header->opcode_base) / m_line_header->line_range;
20563 = (((m_op_index + adjust)
20564 / m_line_header->maximum_ops_per_instruction)
20565 * m_line_header->minimum_instruction_length);
20567 m_address += gdbarch_adjust_dwarf2_line (m_gdbarch, addr_adj, true);
20568 m_op_index = ((m_op_index + adjust)
20569 % m_line_header->maximum_ops_per_instruction);
20572 /* Ignore this record_line request. */
20575 noop_record_line (struct subfile *subfile, int line, CORE_ADDR pc)
20580 /* Return non-zero if we should add LINE to the line number table.
20581 LINE is the line to add, LAST_LINE is the last line that was added,
20582 LAST_SUBFILE is the subfile for LAST_LINE.
20583 LINE_HAS_NON_ZERO_DISCRIMINATOR is non-zero if LINE has ever
20584 had a non-zero discriminator.
20586 We have to be careful in the presence of discriminators.
20587 E.g., for this line:
20589 for (i = 0; i < 100000; i++);
20591 clang can emit four line number entries for that one line,
20592 each with a different discriminator.
20593 See gdb.dwarf2/dw2-single-line-discriminators.exp for an example.
20595 However, we want gdb to coalesce all four entries into one.
20596 Otherwise the user could stepi into the middle of the line and
20597 gdb would get confused about whether the pc really was in the
20598 middle of the line.
20600 Things are further complicated by the fact that two consecutive
20601 line number entries for the same line is a heuristic used by gcc
20602 to denote the end of the prologue. So we can't just discard duplicate
20603 entries, we have to be selective about it. The heuristic we use is
20604 that we only collapse consecutive entries for the same line if at least
20605 one of those entries has a non-zero discriminator. PR 17276.
20607 Note: Addresses in the line number state machine can never go backwards
20608 within one sequence, thus this coalescing is ok. */
20611 dwarf_record_line_p (unsigned int line, unsigned int last_line,
20612 int line_has_non_zero_discriminator,
20613 struct subfile *last_subfile)
20615 if (current_subfile != last_subfile)
20617 if (line != last_line)
20619 /* Same line for the same file that we've seen already.
20620 As a last check, for pr 17276, only record the line if the line
20621 has never had a non-zero discriminator. */
20622 if (!line_has_non_zero_discriminator)
20627 /* Use P_RECORD_LINE to record line number LINE beginning at address ADDRESS
20628 in the line table of subfile SUBFILE. */
20631 dwarf_record_line_1 (struct gdbarch *gdbarch, struct subfile *subfile,
20632 unsigned int line, CORE_ADDR address,
20633 record_line_ftype p_record_line)
20635 CORE_ADDR addr = gdbarch_addr_bits_remove (gdbarch, address);
20637 if (dwarf_line_debug)
20639 fprintf_unfiltered (gdb_stdlog,
20640 "Recording line %u, file %s, address %s\n",
20641 line, lbasename (subfile->name),
20642 paddress (gdbarch, address));
20645 (*p_record_line) (subfile, line, addr);
20648 /* Subroutine of dwarf_decode_lines_1 to simplify it.
20649 Mark the end of a set of line number records.
20650 The arguments are the same as for dwarf_record_line_1.
20651 If SUBFILE is NULL the request is ignored. */
20654 dwarf_finish_line (struct gdbarch *gdbarch, struct subfile *subfile,
20655 CORE_ADDR address, record_line_ftype p_record_line)
20657 if (subfile == NULL)
20660 if (dwarf_line_debug)
20662 fprintf_unfiltered (gdb_stdlog,
20663 "Finishing current line, file %s, address %s\n",
20664 lbasename (subfile->name),
20665 paddress (gdbarch, address));
20668 dwarf_record_line_1 (gdbarch, subfile, 0, address, p_record_line);
20672 lnp_state_machine::record_line (bool end_sequence)
20674 if (dwarf_line_debug)
20676 fprintf_unfiltered (gdb_stdlog,
20677 "Processing actual line %u: file %u,"
20678 " address %s, is_stmt %u, discrim %u\n",
20679 m_line, to_underlying (m_file),
20680 paddress (m_gdbarch, m_address),
20681 m_is_stmt, m_discriminator);
20684 file_entry *fe = current_file ();
20687 dwarf2_debug_line_missing_file_complaint ();
20688 /* For now we ignore lines not starting on an instruction boundary.
20689 But not when processing end_sequence for compatibility with the
20690 previous version of the code. */
20691 else if (m_op_index == 0 || end_sequence)
20693 fe->included_p = 1;
20694 if (m_record_lines_p && m_is_stmt)
20696 if (m_last_subfile != current_subfile || end_sequence)
20698 dwarf_finish_line (m_gdbarch, m_last_subfile,
20699 m_address, m_record_line_callback);
20704 if (dwarf_record_line_p (m_line, m_last_line,
20705 m_line_has_non_zero_discriminator,
20708 dwarf_record_line_1 (m_gdbarch, current_subfile,
20710 m_record_line_callback);
20712 m_last_subfile = current_subfile;
20713 m_last_line = m_line;
20719 lnp_state_machine::lnp_state_machine (gdbarch *arch, line_header *lh,
20720 bool record_lines_p)
20723 m_record_lines_p = record_lines_p;
20724 m_line_header = lh;
20726 m_record_line_callback = ::record_line;
20728 /* Call `gdbarch_adjust_dwarf2_line' on the initial 0 address as if there
20729 was a line entry for it so that the backend has a chance to adjust it
20730 and also record it in case it needs it. This is currently used by MIPS
20731 code, cf. `mips_adjust_dwarf2_line'. */
20732 m_address = gdbarch_adjust_dwarf2_line (arch, 0, 0);
20733 m_is_stmt = lh->default_is_stmt;
20734 m_discriminator = 0;
20738 lnp_state_machine::check_line_address (struct dwarf2_cu *cu,
20739 const gdb_byte *line_ptr,
20740 CORE_ADDR lowpc, CORE_ADDR address)
20742 /* If address < lowpc then it's not a usable value, it's outside the
20743 pc range of the CU. However, we restrict the test to only address
20744 values of zero to preserve GDB's previous behaviour which is to
20745 handle the specific case of a function being GC'd by the linker. */
20747 if (address == 0 && address < lowpc)
20749 /* This line table is for a function which has been
20750 GCd by the linker. Ignore it. PR gdb/12528 */
20752 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
20753 long line_offset = line_ptr - get_debug_line_section (cu)->buffer;
20755 complaint (&symfile_complaints,
20756 _(".debug_line address at offset 0x%lx is 0 [in module %s]"),
20757 line_offset, objfile_name (objfile));
20758 m_record_line_callback = noop_record_line;
20759 /* Note: record_line_callback is left as noop_record_line until
20760 we see DW_LNE_end_sequence. */
20764 /* Subroutine of dwarf_decode_lines to simplify it.
20765 Process the line number information in LH.
20766 If DECODE_FOR_PST_P is non-zero, all we do is process the line number
20767 program in order to set included_p for every referenced header. */
20770 dwarf_decode_lines_1 (struct line_header *lh, struct dwarf2_cu *cu,
20771 const int decode_for_pst_p, CORE_ADDR lowpc)
20773 const gdb_byte *line_ptr, *extended_end;
20774 const gdb_byte *line_end;
20775 unsigned int bytes_read, extended_len;
20776 unsigned char op_code, extended_op;
20777 CORE_ADDR baseaddr;
20778 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
20779 bfd *abfd = objfile->obfd;
20780 struct gdbarch *gdbarch = get_objfile_arch (objfile);
20781 /* True if we're recording line info (as opposed to building partial
20782 symtabs and just interested in finding include files mentioned by
20783 the line number program). */
20784 bool record_lines_p = !decode_for_pst_p;
20786 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
20788 line_ptr = lh->statement_program_start;
20789 line_end = lh->statement_program_end;
20791 /* Read the statement sequences until there's nothing left. */
20792 while (line_ptr < line_end)
20794 /* The DWARF line number program state machine. Reset the state
20795 machine at the start of each sequence. */
20796 lnp_state_machine state_machine (gdbarch, lh, record_lines_p);
20797 bool end_sequence = false;
20799 if (record_lines_p)
20801 /* Start a subfile for the current file of the state
20803 const file_entry *fe = state_machine.current_file ();
20806 dwarf2_start_subfile (fe->name, fe->include_dir (lh));
20809 /* Decode the table. */
20810 while (line_ptr < line_end && !end_sequence)
20812 op_code = read_1_byte (abfd, line_ptr);
20815 if (op_code >= lh->opcode_base)
20817 /* Special opcode. */
20818 state_machine.handle_special_opcode (op_code);
20820 else switch (op_code)
20822 case DW_LNS_extended_op:
20823 extended_len = read_unsigned_leb128 (abfd, line_ptr,
20825 line_ptr += bytes_read;
20826 extended_end = line_ptr + extended_len;
20827 extended_op = read_1_byte (abfd, line_ptr);
20829 switch (extended_op)
20831 case DW_LNE_end_sequence:
20832 state_machine.handle_end_sequence ();
20833 end_sequence = true;
20835 case DW_LNE_set_address:
20838 = read_address (abfd, line_ptr, cu, &bytes_read);
20839 line_ptr += bytes_read;
20841 state_machine.check_line_address (cu, line_ptr,
20843 state_machine.handle_set_address (baseaddr, address);
20846 case DW_LNE_define_file:
20848 const char *cur_file;
20849 unsigned int mod_time, length;
20852 cur_file = read_direct_string (abfd, line_ptr,
20854 line_ptr += bytes_read;
20855 dindex = (dir_index)
20856 read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
20857 line_ptr += bytes_read;
20859 read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
20860 line_ptr += bytes_read;
20862 read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
20863 line_ptr += bytes_read;
20864 lh->add_file_name (cur_file, dindex, mod_time, length);
20867 case DW_LNE_set_discriminator:
20869 /* The discriminator is not interesting to the
20870 debugger; just ignore it. We still need to
20871 check its value though:
20872 if there are consecutive entries for the same
20873 (non-prologue) line we want to coalesce them.
20876 = read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
20877 line_ptr += bytes_read;
20879 state_machine.handle_set_discriminator (discr);
20883 complaint (&symfile_complaints,
20884 _("mangled .debug_line section"));
20887 /* Make sure that we parsed the extended op correctly. If e.g.
20888 we expected a different address size than the producer used,
20889 we may have read the wrong number of bytes. */
20890 if (line_ptr != extended_end)
20892 complaint (&symfile_complaints,
20893 _("mangled .debug_line section"));
20898 state_machine.handle_copy ();
20900 case DW_LNS_advance_pc:
20903 = read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
20904 line_ptr += bytes_read;
20906 state_machine.handle_advance_pc (adjust);
20909 case DW_LNS_advance_line:
20912 = read_signed_leb128 (abfd, line_ptr, &bytes_read);
20913 line_ptr += bytes_read;
20915 state_machine.handle_advance_line (line_delta);
20918 case DW_LNS_set_file:
20920 file_name_index file
20921 = (file_name_index) read_unsigned_leb128 (abfd, line_ptr,
20923 line_ptr += bytes_read;
20925 state_machine.handle_set_file (file);
20928 case DW_LNS_set_column:
20929 (void) read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
20930 line_ptr += bytes_read;
20932 case DW_LNS_negate_stmt:
20933 state_machine.handle_negate_stmt ();
20935 case DW_LNS_set_basic_block:
20937 /* Add to the address register of the state machine the
20938 address increment value corresponding to special opcode
20939 255. I.e., this value is scaled by the minimum
20940 instruction length since special opcode 255 would have
20941 scaled the increment. */
20942 case DW_LNS_const_add_pc:
20943 state_machine.handle_const_add_pc ();
20945 case DW_LNS_fixed_advance_pc:
20947 CORE_ADDR addr_adj = read_2_bytes (abfd, line_ptr);
20950 state_machine.handle_fixed_advance_pc (addr_adj);
20955 /* Unknown standard opcode, ignore it. */
20958 for (i = 0; i < lh->standard_opcode_lengths[op_code]; i++)
20960 (void) read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
20961 line_ptr += bytes_read;
20968 dwarf2_debug_line_missing_end_sequence_complaint ();
20970 /* We got a DW_LNE_end_sequence (or we ran off the end of the buffer,
20971 in which case we still finish recording the last line). */
20972 state_machine.record_line (true);
20976 /* Decode the Line Number Program (LNP) for the given line_header
20977 structure and CU. The actual information extracted and the type
20978 of structures created from the LNP depends on the value of PST.
20980 1. If PST is NULL, then this procedure uses the data from the program
20981 to create all necessary symbol tables, and their linetables.
20983 2. If PST is not NULL, this procedure reads the program to determine
20984 the list of files included by the unit represented by PST, and
20985 builds all the associated partial symbol tables.
20987 COMP_DIR is the compilation directory (DW_AT_comp_dir) or NULL if unknown.
20988 It is used for relative paths in the line table.
20989 NOTE: When processing partial symtabs (pst != NULL),
20990 comp_dir == pst->dirname.
20992 NOTE: It is important that psymtabs have the same file name (via strcmp)
20993 as the corresponding symtab. Since COMP_DIR is not used in the name of the
20994 symtab we don't use it in the name of the psymtabs we create.
20995 E.g. expand_line_sal requires this when finding psymtabs to expand.
20996 A good testcase for this is mb-inline.exp.
20998 LOWPC is the lowest address in CU (or 0 if not known).
21000 Boolean DECODE_MAPPING specifies we need to fully decode .debug_line
21001 for its PC<->lines mapping information. Otherwise only the filename
21002 table is read in. */
21005 dwarf_decode_lines (struct line_header *lh, const char *comp_dir,
21006 struct dwarf2_cu *cu, struct partial_symtab *pst,
21007 CORE_ADDR lowpc, int decode_mapping)
21009 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
21010 const int decode_for_pst_p = (pst != NULL);
21012 if (decode_mapping)
21013 dwarf_decode_lines_1 (lh, cu, decode_for_pst_p, lowpc);
21015 if (decode_for_pst_p)
21019 /* Now that we're done scanning the Line Header Program, we can
21020 create the psymtab of each included file. */
21021 for (file_index = 0; file_index < lh->file_names.size (); file_index++)
21022 if (lh->file_names[file_index].included_p == 1)
21024 gdb::unique_xmalloc_ptr<char> name_holder;
21025 const char *include_name =
21026 psymtab_include_file_name (lh, file_index, pst, comp_dir,
21028 if (include_name != NULL)
21029 dwarf2_create_include_psymtab (include_name, pst, objfile);
21034 /* Make sure a symtab is created for every file, even files
21035 which contain only variables (i.e. no code with associated
21037 struct compunit_symtab *cust = buildsym_compunit_symtab ();
21040 for (i = 0; i < lh->file_names.size (); i++)
21042 file_entry &fe = lh->file_names[i];
21044 dwarf2_start_subfile (fe.name, fe.include_dir (lh));
21046 if (current_subfile->symtab == NULL)
21048 current_subfile->symtab
21049 = allocate_symtab (cust, current_subfile->name);
21051 fe.symtab = current_subfile->symtab;
21056 /* Start a subfile for DWARF. FILENAME is the name of the file and
21057 DIRNAME the name of the source directory which contains FILENAME
21058 or NULL if not known.
21059 This routine tries to keep line numbers from identical absolute and
21060 relative file names in a common subfile.
21062 Using the `list' example from the GDB testsuite, which resides in
21063 /srcdir and compiling it with Irix6.2 cc in /compdir using a filename
21064 of /srcdir/list0.c yields the following debugging information for list0.c:
21066 DW_AT_name: /srcdir/list0.c
21067 DW_AT_comp_dir: /compdir
21068 files.files[0].name: list0.h
21069 files.files[0].dir: /srcdir
21070 files.files[1].name: list0.c
21071 files.files[1].dir: /srcdir
21073 The line number information for list0.c has to end up in a single
21074 subfile, so that `break /srcdir/list0.c:1' works as expected.
21075 start_subfile will ensure that this happens provided that we pass the
21076 concatenation of files.files[1].dir and files.files[1].name as the
21080 dwarf2_start_subfile (const char *filename, const char *dirname)
21084 /* In order not to lose the line information directory,
21085 we concatenate it to the filename when it makes sense.
21086 Note that the Dwarf3 standard says (speaking of filenames in line
21087 information): ``The directory index is ignored for file names
21088 that represent full path names''. Thus ignoring dirname in the
21089 `else' branch below isn't an issue. */
21091 if (!IS_ABSOLUTE_PATH (filename) && dirname != NULL)
21093 copy = concat (dirname, SLASH_STRING, filename, (char *)NULL);
21097 start_subfile (filename);
21103 /* Start a symtab for DWARF.
21104 NAME, COMP_DIR, LOW_PC are passed to start_symtab. */
21106 static struct compunit_symtab *
21107 dwarf2_start_symtab (struct dwarf2_cu *cu,
21108 const char *name, const char *comp_dir, CORE_ADDR low_pc)
21110 struct compunit_symtab *cust
21111 = start_symtab (cu->per_cu->dwarf2_per_objfile->objfile, name, comp_dir,
21112 low_pc, cu->language);
21114 record_debugformat ("DWARF 2");
21115 record_producer (cu->producer);
21117 /* We assume that we're processing GCC output. */
21118 processing_gcc_compilation = 2;
21120 cu->processing_has_namespace_info = 0;
21126 var_decode_location (struct attribute *attr, struct symbol *sym,
21127 struct dwarf2_cu *cu)
21129 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
21130 struct comp_unit_head *cu_header = &cu->header;
21132 /* NOTE drow/2003-01-30: There used to be a comment and some special
21133 code here to turn a symbol with DW_AT_external and a
21134 SYMBOL_VALUE_ADDRESS of 0 into a LOC_UNRESOLVED symbol. This was
21135 necessary for platforms (maybe Alpha, certainly PowerPC GNU/Linux
21136 with some versions of binutils) where shared libraries could have
21137 relocations against symbols in their debug information - the
21138 minimal symbol would have the right address, but the debug info
21139 would not. It's no longer necessary, because we will explicitly
21140 apply relocations when we read in the debug information now. */
21142 /* A DW_AT_location attribute with no contents indicates that a
21143 variable has been optimized away. */
21144 if (attr_form_is_block (attr) && DW_BLOCK (attr)->size == 0)
21146 SYMBOL_ACLASS_INDEX (sym) = LOC_OPTIMIZED_OUT;
21150 /* Handle one degenerate form of location expression specially, to
21151 preserve GDB's previous behavior when section offsets are
21152 specified. If this is just a DW_OP_addr or DW_OP_GNU_addr_index
21153 then mark this symbol as LOC_STATIC. */
21155 if (attr_form_is_block (attr)
21156 && ((DW_BLOCK (attr)->data[0] == DW_OP_addr
21157 && DW_BLOCK (attr)->size == 1 + cu_header->addr_size)
21158 || (DW_BLOCK (attr)->data[0] == DW_OP_GNU_addr_index
21159 && (DW_BLOCK (attr)->size
21160 == 1 + leb128_size (&DW_BLOCK (attr)->data[1])))))
21162 unsigned int dummy;
21164 if (DW_BLOCK (attr)->data[0] == DW_OP_addr)
21165 SYMBOL_VALUE_ADDRESS (sym) =
21166 read_address (objfile->obfd, DW_BLOCK (attr)->data + 1, cu, &dummy);
21168 SYMBOL_VALUE_ADDRESS (sym) =
21169 read_addr_index_from_leb128 (cu, DW_BLOCK (attr)->data + 1, &dummy);
21170 SYMBOL_ACLASS_INDEX (sym) = LOC_STATIC;
21171 fixup_symbol_section (sym, objfile);
21172 SYMBOL_VALUE_ADDRESS (sym) += ANOFFSET (objfile->section_offsets,
21173 SYMBOL_SECTION (sym));
21177 /* NOTE drow/2002-01-30: It might be worthwhile to have a static
21178 expression evaluator, and use LOC_COMPUTED only when necessary
21179 (i.e. when the value of a register or memory location is
21180 referenced, or a thread-local block, etc.). Then again, it might
21181 not be worthwhile. I'm assuming that it isn't unless performance
21182 or memory numbers show me otherwise. */
21184 dwarf2_symbol_mark_computed (attr, sym, cu, 0);
21186 if (SYMBOL_COMPUTED_OPS (sym)->location_has_loclist)
21187 cu->has_loclist = 1;
21190 /* Given a pointer to a DWARF information entry, figure out if we need
21191 to make a symbol table entry for it, and if so, create a new entry
21192 and return a pointer to it.
21193 If TYPE is NULL, determine symbol type from the die, otherwise
21194 used the passed type.
21195 If SPACE is not NULL, use it to hold the new symbol. If it is
21196 NULL, allocate a new symbol on the objfile's obstack. */
21198 static struct symbol *
21199 new_symbol (struct die_info *die, struct type *type, struct dwarf2_cu *cu,
21200 struct symbol *space)
21202 struct dwarf2_per_objfile *dwarf2_per_objfile
21203 = cu->per_cu->dwarf2_per_objfile;
21204 struct objfile *objfile = dwarf2_per_objfile->objfile;
21205 struct gdbarch *gdbarch = get_objfile_arch (objfile);
21206 struct symbol *sym = NULL;
21208 struct attribute *attr = NULL;
21209 struct attribute *attr2 = NULL;
21210 CORE_ADDR baseaddr;
21211 struct pending **list_to_add = NULL;
21213 int inlined_func = (die->tag == DW_TAG_inlined_subroutine);
21215 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
21217 name = dwarf2_name (die, cu);
21220 const char *linkagename;
21221 int suppress_add = 0;
21226 sym = allocate_symbol (objfile);
21227 OBJSTAT (objfile, n_syms++);
21229 /* Cache this symbol's name and the name's demangled form (if any). */
21230 SYMBOL_SET_LANGUAGE (sym, cu->language, &objfile->objfile_obstack);
21231 linkagename = dwarf2_physname (name, die, cu);
21232 SYMBOL_SET_NAMES (sym, linkagename, strlen (linkagename), 0, objfile);
21234 /* Fortran does not have mangling standard and the mangling does differ
21235 between gfortran, iFort etc. */
21236 if (cu->language == language_fortran
21237 && symbol_get_demangled_name (&(sym->ginfo)) == NULL)
21238 symbol_set_demangled_name (&(sym->ginfo),
21239 dwarf2_full_name (name, die, cu),
21242 /* Default assumptions.
21243 Use the passed type or decode it from the die. */
21244 SYMBOL_DOMAIN (sym) = VAR_DOMAIN;
21245 SYMBOL_ACLASS_INDEX (sym) = LOC_OPTIMIZED_OUT;
21247 SYMBOL_TYPE (sym) = type;
21249 SYMBOL_TYPE (sym) = die_type (die, cu);
21250 attr = dwarf2_attr (die,
21251 inlined_func ? DW_AT_call_line : DW_AT_decl_line,
21255 SYMBOL_LINE (sym) = DW_UNSND (attr);
21258 attr = dwarf2_attr (die,
21259 inlined_func ? DW_AT_call_file : DW_AT_decl_file,
21263 file_name_index file_index = (file_name_index) DW_UNSND (attr);
21264 struct file_entry *fe;
21266 if (cu->line_header != NULL)
21267 fe = cu->line_header->file_name_at (file_index);
21272 complaint (&symfile_complaints,
21273 _("file index out of range"));
21275 symbol_set_symtab (sym, fe->symtab);
21281 attr = dwarf2_attr (die, DW_AT_low_pc, cu);
21286 addr = attr_value_as_address (attr);
21287 addr = gdbarch_adjust_dwarf2_addr (gdbarch, addr + baseaddr);
21288 SYMBOL_VALUE_ADDRESS (sym) = addr;
21290 SYMBOL_TYPE (sym) = objfile_type (objfile)->builtin_core_addr;
21291 SYMBOL_DOMAIN (sym) = LABEL_DOMAIN;
21292 SYMBOL_ACLASS_INDEX (sym) = LOC_LABEL;
21293 add_symbol_to_list (sym, cu->list_in_scope);
21295 case DW_TAG_subprogram:
21296 /* SYMBOL_BLOCK_VALUE (sym) will be filled in later by
21298 SYMBOL_ACLASS_INDEX (sym) = LOC_BLOCK;
21299 attr2 = dwarf2_attr (die, DW_AT_external, cu);
21300 if ((attr2 && (DW_UNSND (attr2) != 0))
21301 || cu->language == language_ada)
21303 /* Subprograms marked external are stored as a global symbol.
21304 Ada subprograms, whether marked external or not, are always
21305 stored as a global symbol, because we want to be able to
21306 access them globally. For instance, we want to be able
21307 to break on a nested subprogram without having to
21308 specify the context. */
21309 list_to_add = &global_symbols;
21313 list_to_add = cu->list_in_scope;
21316 case DW_TAG_inlined_subroutine:
21317 /* SYMBOL_BLOCK_VALUE (sym) will be filled in later by
21319 SYMBOL_ACLASS_INDEX (sym) = LOC_BLOCK;
21320 SYMBOL_INLINED (sym) = 1;
21321 list_to_add = cu->list_in_scope;
21323 case DW_TAG_template_value_param:
21325 /* Fall through. */
21326 case DW_TAG_constant:
21327 case DW_TAG_variable:
21328 case DW_TAG_member:
21329 /* Compilation with minimal debug info may result in
21330 variables with missing type entries. Change the
21331 misleading `void' type to something sensible. */
21332 if (TYPE_CODE (SYMBOL_TYPE (sym)) == TYPE_CODE_VOID)
21333 SYMBOL_TYPE (sym) = objfile_type (objfile)->builtin_int;
21335 attr = dwarf2_attr (die, DW_AT_const_value, cu);
21336 /* In the case of DW_TAG_member, we should only be called for
21337 static const members. */
21338 if (die->tag == DW_TAG_member)
21340 /* dwarf2_add_field uses die_is_declaration,
21341 so we do the same. */
21342 gdb_assert (die_is_declaration (die, cu));
21347 dwarf2_const_value (attr, sym, cu);
21348 attr2 = dwarf2_attr (die, DW_AT_external, cu);
21351 if (attr2 && (DW_UNSND (attr2) != 0))
21352 list_to_add = &global_symbols;
21354 list_to_add = cu->list_in_scope;
21358 attr = dwarf2_attr (die, DW_AT_location, cu);
21361 var_decode_location (attr, sym, cu);
21362 attr2 = dwarf2_attr (die, DW_AT_external, cu);
21364 /* Fortran explicitly imports any global symbols to the local
21365 scope by DW_TAG_common_block. */
21366 if (cu->language == language_fortran && die->parent
21367 && die->parent->tag == DW_TAG_common_block)
21370 if (SYMBOL_CLASS (sym) == LOC_STATIC
21371 && SYMBOL_VALUE_ADDRESS (sym) == 0
21372 && !dwarf2_per_objfile->has_section_at_zero)
21374 /* When a static variable is eliminated by the linker,
21375 the corresponding debug information is not stripped
21376 out, but the variable address is set to null;
21377 do not add such variables into symbol table. */
21379 else if (attr2 && (DW_UNSND (attr2) != 0))
21381 /* Workaround gfortran PR debug/40040 - it uses
21382 DW_AT_location for variables in -fPIC libraries which may
21383 get overriden by other libraries/executable and get
21384 a different address. Resolve it by the minimal symbol
21385 which may come from inferior's executable using copy
21386 relocation. Make this workaround only for gfortran as for
21387 other compilers GDB cannot guess the minimal symbol
21388 Fortran mangling kind. */
21389 if (cu->language == language_fortran && die->parent
21390 && die->parent->tag == DW_TAG_module
21392 && startswith (cu->producer, "GNU Fortran"))
21393 SYMBOL_ACLASS_INDEX (sym) = LOC_UNRESOLVED;
21395 /* A variable with DW_AT_external is never static,
21396 but it may be block-scoped. */
21397 list_to_add = (cu->list_in_scope == &file_symbols
21398 ? &global_symbols : cu->list_in_scope);
21401 list_to_add = cu->list_in_scope;
21405 /* We do not know the address of this symbol.
21406 If it is an external symbol and we have type information
21407 for it, enter the symbol as a LOC_UNRESOLVED symbol.
21408 The address of the variable will then be determined from
21409 the minimal symbol table whenever the variable is
21411 attr2 = dwarf2_attr (die, DW_AT_external, cu);
21413 /* Fortran explicitly imports any global symbols to the local
21414 scope by DW_TAG_common_block. */
21415 if (cu->language == language_fortran && die->parent
21416 && die->parent->tag == DW_TAG_common_block)
21418 /* SYMBOL_CLASS doesn't matter here because
21419 read_common_block is going to reset it. */
21421 list_to_add = cu->list_in_scope;
21423 else if (attr2 && (DW_UNSND (attr2) != 0)
21424 && dwarf2_attr (die, DW_AT_type, cu) != NULL)
21426 /* A variable with DW_AT_external is never static, but it
21427 may be block-scoped. */
21428 list_to_add = (cu->list_in_scope == &file_symbols
21429 ? &global_symbols : cu->list_in_scope);
21431 SYMBOL_ACLASS_INDEX (sym) = LOC_UNRESOLVED;
21433 else if (!die_is_declaration (die, cu))
21435 /* Use the default LOC_OPTIMIZED_OUT class. */
21436 gdb_assert (SYMBOL_CLASS (sym) == LOC_OPTIMIZED_OUT);
21438 list_to_add = cu->list_in_scope;
21442 case DW_TAG_formal_parameter:
21443 /* If we are inside a function, mark this as an argument. If
21444 not, we might be looking at an argument to an inlined function
21445 when we do not have enough information to show inlined frames;
21446 pretend it's a local variable in that case so that the user can
21448 if (context_stack_depth > 0
21449 && context_stack[context_stack_depth - 1].name != NULL)
21450 SYMBOL_IS_ARGUMENT (sym) = 1;
21451 attr = dwarf2_attr (die, DW_AT_location, cu);
21454 var_decode_location (attr, sym, cu);
21456 attr = dwarf2_attr (die, DW_AT_const_value, cu);
21459 dwarf2_const_value (attr, sym, cu);
21462 list_to_add = cu->list_in_scope;
21464 case DW_TAG_unspecified_parameters:
21465 /* From varargs functions; gdb doesn't seem to have any
21466 interest in this information, so just ignore it for now.
21469 case DW_TAG_template_type_param:
21471 /* Fall through. */
21472 case DW_TAG_class_type:
21473 case DW_TAG_interface_type:
21474 case DW_TAG_structure_type:
21475 case DW_TAG_union_type:
21476 case DW_TAG_set_type:
21477 case DW_TAG_enumeration_type:
21478 SYMBOL_ACLASS_INDEX (sym) = LOC_TYPEDEF;
21479 SYMBOL_DOMAIN (sym) = STRUCT_DOMAIN;
21482 /* NOTE: carlton/2003-11-10: C++ class symbols shouldn't
21483 really ever be static objects: otherwise, if you try
21484 to, say, break of a class's method and you're in a file
21485 which doesn't mention that class, it won't work unless
21486 the check for all static symbols in lookup_symbol_aux
21487 saves you. See the OtherFileClass tests in
21488 gdb.c++/namespace.exp. */
21492 list_to_add = (cu->list_in_scope == &file_symbols
21493 && cu->language == language_cplus
21494 ? &global_symbols : cu->list_in_scope);
21496 /* The semantics of C++ state that "struct foo {
21497 ... }" also defines a typedef for "foo". */
21498 if (cu->language == language_cplus
21499 || cu->language == language_ada
21500 || cu->language == language_d
21501 || cu->language == language_rust)
21503 /* The symbol's name is already allocated along
21504 with this objfile, so we don't need to
21505 duplicate it for the type. */
21506 if (TYPE_NAME (SYMBOL_TYPE (sym)) == 0)
21507 TYPE_NAME (SYMBOL_TYPE (sym)) = SYMBOL_SEARCH_NAME (sym);
21512 case DW_TAG_typedef:
21513 SYMBOL_ACLASS_INDEX (sym) = LOC_TYPEDEF;
21514 SYMBOL_DOMAIN (sym) = VAR_DOMAIN;
21515 list_to_add = cu->list_in_scope;
21517 case DW_TAG_base_type:
21518 case DW_TAG_subrange_type:
21519 SYMBOL_ACLASS_INDEX (sym) = LOC_TYPEDEF;
21520 SYMBOL_DOMAIN (sym) = VAR_DOMAIN;
21521 list_to_add = cu->list_in_scope;
21523 case DW_TAG_enumerator:
21524 attr = dwarf2_attr (die, DW_AT_const_value, cu);
21527 dwarf2_const_value (attr, sym, cu);
21530 /* NOTE: carlton/2003-11-10: See comment above in the
21531 DW_TAG_class_type, etc. block. */
21533 list_to_add = (cu->list_in_scope == &file_symbols
21534 && cu->language == language_cplus
21535 ? &global_symbols : cu->list_in_scope);
21538 case DW_TAG_imported_declaration:
21539 case DW_TAG_namespace:
21540 SYMBOL_ACLASS_INDEX (sym) = LOC_TYPEDEF;
21541 list_to_add = &global_symbols;
21543 case DW_TAG_module:
21544 SYMBOL_ACLASS_INDEX (sym) = LOC_TYPEDEF;
21545 SYMBOL_DOMAIN (sym) = MODULE_DOMAIN;
21546 list_to_add = &global_symbols;
21548 case DW_TAG_common_block:
21549 SYMBOL_ACLASS_INDEX (sym) = LOC_COMMON_BLOCK;
21550 SYMBOL_DOMAIN (sym) = COMMON_BLOCK_DOMAIN;
21551 add_symbol_to_list (sym, cu->list_in_scope);
21554 /* Not a tag we recognize. Hopefully we aren't processing
21555 trash data, but since we must specifically ignore things
21556 we don't recognize, there is nothing else we should do at
21558 complaint (&symfile_complaints, _("unsupported tag: '%s'"),
21559 dwarf_tag_name (die->tag));
21565 sym->hash_next = objfile->template_symbols;
21566 objfile->template_symbols = sym;
21567 list_to_add = NULL;
21570 if (list_to_add != NULL)
21571 add_symbol_to_list (sym, list_to_add);
21573 /* For the benefit of old versions of GCC, check for anonymous
21574 namespaces based on the demangled name. */
21575 if (!cu->processing_has_namespace_info
21576 && cu->language == language_cplus)
21577 cp_scan_for_anonymous_namespaces (sym, objfile);
21582 /* Given an attr with a DW_FORM_dataN value in host byte order,
21583 zero-extend it as appropriate for the symbol's type. The DWARF
21584 standard (v4) is not entirely clear about the meaning of using
21585 DW_FORM_dataN for a constant with a signed type, where the type is
21586 wider than the data. The conclusion of a discussion on the DWARF
21587 list was that this is unspecified. We choose to always zero-extend
21588 because that is the interpretation long in use by GCC. */
21591 dwarf2_const_value_data (const struct attribute *attr, struct obstack *obstack,
21592 struct dwarf2_cu *cu, LONGEST *value, int bits)
21594 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
21595 enum bfd_endian byte_order = bfd_big_endian (objfile->obfd) ?
21596 BFD_ENDIAN_BIG : BFD_ENDIAN_LITTLE;
21597 LONGEST l = DW_UNSND (attr);
21599 if (bits < sizeof (*value) * 8)
21601 l &= ((LONGEST) 1 << bits) - 1;
21604 else if (bits == sizeof (*value) * 8)
21608 gdb_byte *bytes = (gdb_byte *) obstack_alloc (obstack, bits / 8);
21609 store_unsigned_integer (bytes, bits / 8, byte_order, l);
21616 /* Read a constant value from an attribute. Either set *VALUE, or if
21617 the value does not fit in *VALUE, set *BYTES - either already
21618 allocated on the objfile obstack, or newly allocated on OBSTACK,
21619 or, set *BATON, if we translated the constant to a location
21623 dwarf2_const_value_attr (const struct attribute *attr, struct type *type,
21624 const char *name, struct obstack *obstack,
21625 struct dwarf2_cu *cu,
21626 LONGEST *value, const gdb_byte **bytes,
21627 struct dwarf2_locexpr_baton **baton)
21629 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
21630 struct comp_unit_head *cu_header = &cu->header;
21631 struct dwarf_block *blk;
21632 enum bfd_endian byte_order = (bfd_big_endian (objfile->obfd) ?
21633 BFD_ENDIAN_BIG : BFD_ENDIAN_LITTLE);
21639 switch (attr->form)
21642 case DW_FORM_GNU_addr_index:
21646 if (TYPE_LENGTH (type) != cu_header->addr_size)
21647 dwarf2_const_value_length_mismatch_complaint (name,
21648 cu_header->addr_size,
21649 TYPE_LENGTH (type));
21650 /* Symbols of this form are reasonably rare, so we just
21651 piggyback on the existing location code rather than writing
21652 a new implementation of symbol_computed_ops. */
21653 *baton = XOBNEW (obstack, struct dwarf2_locexpr_baton);
21654 (*baton)->per_cu = cu->per_cu;
21655 gdb_assert ((*baton)->per_cu);
21657 (*baton)->size = 2 + cu_header->addr_size;
21658 data = (gdb_byte *) obstack_alloc (obstack, (*baton)->size);
21659 (*baton)->data = data;
21661 data[0] = DW_OP_addr;
21662 store_unsigned_integer (&data[1], cu_header->addr_size,
21663 byte_order, DW_ADDR (attr));
21664 data[cu_header->addr_size + 1] = DW_OP_stack_value;
21667 case DW_FORM_string:
21669 case DW_FORM_GNU_str_index:
21670 case DW_FORM_GNU_strp_alt:
21671 /* DW_STRING is already allocated on the objfile obstack, point
21673 *bytes = (const gdb_byte *) DW_STRING (attr);
21675 case DW_FORM_block1:
21676 case DW_FORM_block2:
21677 case DW_FORM_block4:
21678 case DW_FORM_block:
21679 case DW_FORM_exprloc:
21680 case DW_FORM_data16:
21681 blk = DW_BLOCK (attr);
21682 if (TYPE_LENGTH (type) != blk->size)
21683 dwarf2_const_value_length_mismatch_complaint (name, blk->size,
21684 TYPE_LENGTH (type));
21685 *bytes = blk->data;
21688 /* The DW_AT_const_value attributes are supposed to carry the
21689 symbol's value "represented as it would be on the target
21690 architecture." By the time we get here, it's already been
21691 converted to host endianness, so we just need to sign- or
21692 zero-extend it as appropriate. */
21693 case DW_FORM_data1:
21694 *bytes = dwarf2_const_value_data (attr, obstack, cu, value, 8);
21696 case DW_FORM_data2:
21697 *bytes = dwarf2_const_value_data (attr, obstack, cu, value, 16);
21699 case DW_FORM_data4:
21700 *bytes = dwarf2_const_value_data (attr, obstack, cu, value, 32);
21702 case DW_FORM_data8:
21703 *bytes = dwarf2_const_value_data (attr, obstack, cu, value, 64);
21706 case DW_FORM_sdata:
21707 case DW_FORM_implicit_const:
21708 *value = DW_SND (attr);
21711 case DW_FORM_udata:
21712 *value = DW_UNSND (attr);
21716 complaint (&symfile_complaints,
21717 _("unsupported const value attribute form: '%s'"),
21718 dwarf_form_name (attr->form));
21725 /* Copy constant value from an attribute to a symbol. */
21728 dwarf2_const_value (const struct attribute *attr, struct symbol *sym,
21729 struct dwarf2_cu *cu)
21731 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
21733 const gdb_byte *bytes;
21734 struct dwarf2_locexpr_baton *baton;
21736 dwarf2_const_value_attr (attr, SYMBOL_TYPE (sym),
21737 SYMBOL_PRINT_NAME (sym),
21738 &objfile->objfile_obstack, cu,
21739 &value, &bytes, &baton);
21743 SYMBOL_LOCATION_BATON (sym) = baton;
21744 SYMBOL_ACLASS_INDEX (sym) = dwarf2_locexpr_index;
21746 else if (bytes != NULL)
21748 SYMBOL_VALUE_BYTES (sym) = bytes;
21749 SYMBOL_ACLASS_INDEX (sym) = LOC_CONST_BYTES;
21753 SYMBOL_VALUE (sym) = value;
21754 SYMBOL_ACLASS_INDEX (sym) = LOC_CONST;
21758 /* Return the type of the die in question using its DW_AT_type attribute. */
21760 static struct type *
21761 die_type (struct die_info *die, struct dwarf2_cu *cu)
21763 struct attribute *type_attr;
21765 type_attr = dwarf2_attr (die, DW_AT_type, cu);
21768 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
21769 /* A missing DW_AT_type represents a void type. */
21770 return objfile_type (objfile)->builtin_void;
21773 return lookup_die_type (die, type_attr, cu);
21776 /* True iff CU's producer generates GNAT Ada auxiliary information
21777 that allows to find parallel types through that information instead
21778 of having to do expensive parallel lookups by type name. */
21781 need_gnat_info (struct dwarf2_cu *cu)
21783 /* Assume that the Ada compiler was GNAT, which always produces
21784 the auxiliary information. */
21785 return (cu->language == language_ada);
21788 /* Return the auxiliary type of the die in question using its
21789 DW_AT_GNAT_descriptive_type attribute. Returns NULL if the
21790 attribute is not present. */
21792 static struct type *
21793 die_descriptive_type (struct die_info *die, struct dwarf2_cu *cu)
21795 struct attribute *type_attr;
21797 type_attr = dwarf2_attr (die, DW_AT_GNAT_descriptive_type, cu);
21801 return lookup_die_type (die, type_attr, cu);
21804 /* If DIE has a descriptive_type attribute, then set the TYPE's
21805 descriptive type accordingly. */
21808 set_descriptive_type (struct type *type, struct die_info *die,
21809 struct dwarf2_cu *cu)
21811 struct type *descriptive_type = die_descriptive_type (die, cu);
21813 if (descriptive_type)
21815 ALLOCATE_GNAT_AUX_TYPE (type);
21816 TYPE_DESCRIPTIVE_TYPE (type) = descriptive_type;
21820 /* Return the containing type of the die in question using its
21821 DW_AT_containing_type attribute. */
21823 static struct type *
21824 die_containing_type (struct die_info *die, struct dwarf2_cu *cu)
21826 struct attribute *type_attr;
21827 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
21829 type_attr = dwarf2_attr (die, DW_AT_containing_type, cu);
21831 error (_("Dwarf Error: Problem turning containing type into gdb type "
21832 "[in module %s]"), objfile_name (objfile));
21834 return lookup_die_type (die, type_attr, cu);
21837 /* Return an error marker type to use for the ill formed type in DIE/CU. */
21839 static struct type *
21840 build_error_marker_type (struct dwarf2_cu *cu, struct die_info *die)
21842 struct dwarf2_per_objfile *dwarf2_per_objfile
21843 = cu->per_cu->dwarf2_per_objfile;
21844 struct objfile *objfile = dwarf2_per_objfile->objfile;
21845 char *message, *saved;
21847 message = xstrprintf (_("<unknown type in %s, CU %s, DIE %s>"),
21848 objfile_name (objfile),
21849 sect_offset_str (cu->header.sect_off),
21850 sect_offset_str (die->sect_off));
21851 saved = (char *) obstack_copy0 (&objfile->objfile_obstack,
21852 message, strlen (message));
21855 return init_type (objfile, TYPE_CODE_ERROR, 0, saved);
21858 /* Look up the type of DIE in CU using its type attribute ATTR.
21859 ATTR must be one of: DW_AT_type, DW_AT_GNAT_descriptive_type,
21860 DW_AT_containing_type.
21861 If there is no type substitute an error marker. */
21863 static struct type *
21864 lookup_die_type (struct die_info *die, const struct attribute *attr,
21865 struct dwarf2_cu *cu)
21867 struct dwarf2_per_objfile *dwarf2_per_objfile
21868 = cu->per_cu->dwarf2_per_objfile;
21869 struct objfile *objfile = dwarf2_per_objfile->objfile;
21870 struct type *this_type;
21872 gdb_assert (attr->name == DW_AT_type
21873 || attr->name == DW_AT_GNAT_descriptive_type
21874 || attr->name == DW_AT_containing_type);
21876 /* First see if we have it cached. */
21878 if (attr->form == DW_FORM_GNU_ref_alt)
21880 struct dwarf2_per_cu_data *per_cu;
21881 sect_offset sect_off = dwarf2_get_ref_die_offset (attr);
21883 per_cu = dwarf2_find_containing_comp_unit (sect_off, 1,
21884 dwarf2_per_objfile);
21885 this_type = get_die_type_at_offset (sect_off, per_cu);
21887 else if (attr_form_is_ref (attr))
21889 sect_offset sect_off = dwarf2_get_ref_die_offset (attr);
21891 this_type = get_die_type_at_offset (sect_off, cu->per_cu);
21893 else if (attr->form == DW_FORM_ref_sig8)
21895 ULONGEST signature = DW_SIGNATURE (attr);
21897 return get_signatured_type (die, signature, cu);
21901 complaint (&symfile_complaints,
21902 _("Dwarf Error: Bad type attribute %s in DIE"
21903 " at %s [in module %s]"),
21904 dwarf_attr_name (attr->name), sect_offset_str (die->sect_off),
21905 objfile_name (objfile));
21906 return build_error_marker_type (cu, die);
21909 /* If not cached we need to read it in. */
21911 if (this_type == NULL)
21913 struct die_info *type_die = NULL;
21914 struct dwarf2_cu *type_cu = cu;
21916 if (attr_form_is_ref (attr))
21917 type_die = follow_die_ref (die, attr, &type_cu);
21918 if (type_die == NULL)
21919 return build_error_marker_type (cu, die);
21920 /* If we find the type now, it's probably because the type came
21921 from an inter-CU reference and the type's CU got expanded before
21923 this_type = read_type_die (type_die, type_cu);
21926 /* If we still don't have a type use an error marker. */
21928 if (this_type == NULL)
21929 return build_error_marker_type (cu, die);
21934 /* Return the type in DIE, CU.
21935 Returns NULL for invalid types.
21937 This first does a lookup in die_type_hash,
21938 and only reads the die in if necessary.
21940 NOTE: This can be called when reading in partial or full symbols. */
21942 static struct type *
21943 read_type_die (struct die_info *die, struct dwarf2_cu *cu)
21945 struct type *this_type;
21947 this_type = get_die_type (die, cu);
21951 return read_type_die_1 (die, cu);
21954 /* Read the type in DIE, CU.
21955 Returns NULL for invalid types. */
21957 static struct type *
21958 read_type_die_1 (struct die_info *die, struct dwarf2_cu *cu)
21960 struct type *this_type = NULL;
21964 case DW_TAG_class_type:
21965 case DW_TAG_interface_type:
21966 case DW_TAG_structure_type:
21967 case DW_TAG_union_type:
21968 this_type = read_structure_type (die, cu);
21970 case DW_TAG_enumeration_type:
21971 this_type = read_enumeration_type (die, cu);
21973 case DW_TAG_subprogram:
21974 case DW_TAG_subroutine_type:
21975 case DW_TAG_inlined_subroutine:
21976 this_type = read_subroutine_type (die, cu);
21978 case DW_TAG_array_type:
21979 this_type = read_array_type (die, cu);
21981 case DW_TAG_set_type:
21982 this_type = read_set_type (die, cu);
21984 case DW_TAG_pointer_type:
21985 this_type = read_tag_pointer_type (die, cu);
21987 case DW_TAG_ptr_to_member_type:
21988 this_type = read_tag_ptr_to_member_type (die, cu);
21990 case DW_TAG_reference_type:
21991 this_type = read_tag_reference_type (die, cu, TYPE_CODE_REF);
21993 case DW_TAG_rvalue_reference_type:
21994 this_type = read_tag_reference_type (die, cu, TYPE_CODE_RVALUE_REF);
21996 case DW_TAG_const_type:
21997 this_type = read_tag_const_type (die, cu);
21999 case DW_TAG_volatile_type:
22000 this_type = read_tag_volatile_type (die, cu);
22002 case DW_TAG_restrict_type:
22003 this_type = read_tag_restrict_type (die, cu);
22005 case DW_TAG_string_type:
22006 this_type = read_tag_string_type (die, cu);
22008 case DW_TAG_typedef:
22009 this_type = read_typedef (die, cu);
22011 case DW_TAG_subrange_type:
22012 this_type = read_subrange_type (die, cu);
22014 case DW_TAG_base_type:
22015 this_type = read_base_type (die, cu);
22017 case DW_TAG_unspecified_type:
22018 this_type = read_unspecified_type (die, cu);
22020 case DW_TAG_namespace:
22021 this_type = read_namespace_type (die, cu);
22023 case DW_TAG_module:
22024 this_type = read_module_type (die, cu);
22026 case DW_TAG_atomic_type:
22027 this_type = read_tag_atomic_type (die, cu);
22030 complaint (&symfile_complaints,
22031 _("unexpected tag in read_type_die: '%s'"),
22032 dwarf_tag_name (die->tag));
22039 /* See if we can figure out if the class lives in a namespace. We do
22040 this by looking for a member function; its demangled name will
22041 contain namespace info, if there is any.
22042 Return the computed name or NULL.
22043 Space for the result is allocated on the objfile's obstack.
22044 This is the full-die version of guess_partial_die_structure_name.
22045 In this case we know DIE has no useful parent. */
22048 guess_full_die_structure_name (struct die_info *die, struct dwarf2_cu *cu)
22050 struct die_info *spec_die;
22051 struct dwarf2_cu *spec_cu;
22052 struct die_info *child;
22053 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
22056 spec_die = die_specification (die, &spec_cu);
22057 if (spec_die != NULL)
22063 for (child = die->child;
22065 child = child->sibling)
22067 if (child->tag == DW_TAG_subprogram)
22069 const char *linkage_name = dw2_linkage_name (child, cu);
22071 if (linkage_name != NULL)
22074 = language_class_name_from_physname (cu->language_defn,
22078 if (actual_name != NULL)
22080 const char *die_name = dwarf2_name (die, cu);
22082 if (die_name != NULL
22083 && strcmp (die_name, actual_name) != 0)
22085 /* Strip off the class name from the full name.
22086 We want the prefix. */
22087 int die_name_len = strlen (die_name);
22088 int actual_name_len = strlen (actual_name);
22090 /* Test for '::' as a sanity check. */
22091 if (actual_name_len > die_name_len + 2
22092 && actual_name[actual_name_len
22093 - die_name_len - 1] == ':')
22094 name = (char *) obstack_copy0 (
22095 &objfile->per_bfd->storage_obstack,
22096 actual_name, actual_name_len - die_name_len - 2);
22099 xfree (actual_name);
22108 /* GCC might emit a nameless typedef that has a linkage name. Determine the
22109 prefix part in such case. See
22110 http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47510. */
22112 static const char *
22113 anonymous_struct_prefix (struct die_info *die, struct dwarf2_cu *cu)
22115 struct attribute *attr;
22118 if (die->tag != DW_TAG_class_type && die->tag != DW_TAG_interface_type
22119 && die->tag != DW_TAG_structure_type && die->tag != DW_TAG_union_type)
22122 if (dwarf2_string_attr (die, DW_AT_name, cu) != NULL)
22125 attr = dw2_linkage_name_attr (die, cu);
22126 if (attr == NULL || DW_STRING (attr) == NULL)
22129 /* dwarf2_name had to be already called. */
22130 gdb_assert (DW_STRING_IS_CANONICAL (attr));
22132 /* Strip the base name, keep any leading namespaces/classes. */
22133 base = strrchr (DW_STRING (attr), ':');
22134 if (base == NULL || base == DW_STRING (attr) || base[-1] != ':')
22137 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
22138 return (char *) obstack_copy0 (&objfile->per_bfd->storage_obstack,
22140 &base[-1] - DW_STRING (attr));
22143 /* Return the name of the namespace/class that DIE is defined within,
22144 or "" if we can't tell. The caller should not xfree the result.
22146 For example, if we're within the method foo() in the following
22156 then determine_prefix on foo's die will return "N::C". */
22158 static const char *
22159 determine_prefix (struct die_info *die, struct dwarf2_cu *cu)
22161 struct dwarf2_per_objfile *dwarf2_per_objfile
22162 = cu->per_cu->dwarf2_per_objfile;
22163 struct die_info *parent, *spec_die;
22164 struct dwarf2_cu *spec_cu;
22165 struct type *parent_type;
22166 const char *retval;
22168 if (cu->language != language_cplus
22169 && cu->language != language_fortran && cu->language != language_d
22170 && cu->language != language_rust)
22173 retval = anonymous_struct_prefix (die, cu);
22177 /* We have to be careful in the presence of DW_AT_specification.
22178 For example, with GCC 3.4, given the code
22182 // Definition of N::foo.
22186 then we'll have a tree of DIEs like this:
22188 1: DW_TAG_compile_unit
22189 2: DW_TAG_namespace // N
22190 3: DW_TAG_subprogram // declaration of N::foo
22191 4: DW_TAG_subprogram // definition of N::foo
22192 DW_AT_specification // refers to die #3
22194 Thus, when processing die #4, we have to pretend that we're in
22195 the context of its DW_AT_specification, namely the contex of die
22198 spec_die = die_specification (die, &spec_cu);
22199 if (spec_die == NULL)
22200 parent = die->parent;
22203 parent = spec_die->parent;
22207 if (parent == NULL)
22209 else if (parent->building_fullname)
22212 const char *parent_name;
22214 /* It has been seen on RealView 2.2 built binaries,
22215 DW_TAG_template_type_param types actually _defined_ as
22216 children of the parent class:
22219 template class <class Enum> Class{};
22220 Class<enum E> class_e;
22222 1: DW_TAG_class_type (Class)
22223 2: DW_TAG_enumeration_type (E)
22224 3: DW_TAG_enumerator (enum1:0)
22225 3: DW_TAG_enumerator (enum2:1)
22227 2: DW_TAG_template_type_param
22228 DW_AT_type DW_FORM_ref_udata (E)
22230 Besides being broken debug info, it can put GDB into an
22231 infinite loop. Consider:
22233 When we're building the full name for Class<E>, we'll start
22234 at Class, and go look over its template type parameters,
22235 finding E. We'll then try to build the full name of E, and
22236 reach here. We're now trying to build the full name of E,
22237 and look over the parent DIE for containing scope. In the
22238 broken case, if we followed the parent DIE of E, we'd again
22239 find Class, and once again go look at its template type
22240 arguments, etc., etc. Simply don't consider such parent die
22241 as source-level parent of this die (it can't be, the language
22242 doesn't allow it), and break the loop here. */
22243 name = dwarf2_name (die, cu);
22244 parent_name = dwarf2_name (parent, cu);
22245 complaint (&symfile_complaints,
22246 _("template param type '%s' defined within parent '%s'"),
22247 name ? name : "<unknown>",
22248 parent_name ? parent_name : "<unknown>");
22252 switch (parent->tag)
22254 case DW_TAG_namespace:
22255 parent_type = read_type_die (parent, cu);
22256 /* GCC 4.0 and 4.1 had a bug (PR c++/28460) where they generated bogus
22257 DW_TAG_namespace DIEs with a name of "::" for the global namespace.
22258 Work around this problem here. */
22259 if (cu->language == language_cplus
22260 && strcmp (TYPE_TAG_NAME (parent_type), "::") == 0)
22262 /* We give a name to even anonymous namespaces. */
22263 return TYPE_TAG_NAME (parent_type);
22264 case DW_TAG_class_type:
22265 case DW_TAG_interface_type:
22266 case DW_TAG_structure_type:
22267 case DW_TAG_union_type:
22268 case DW_TAG_module:
22269 parent_type = read_type_die (parent, cu);
22270 if (TYPE_TAG_NAME (parent_type) != NULL)
22271 return TYPE_TAG_NAME (parent_type);
22273 /* An anonymous structure is only allowed non-static data
22274 members; no typedefs, no member functions, et cetera.
22275 So it does not need a prefix. */
22277 case DW_TAG_compile_unit:
22278 case DW_TAG_partial_unit:
22279 /* gcc-4.5 -gdwarf-4 can drop the enclosing namespace. Cope. */
22280 if (cu->language == language_cplus
22281 && !VEC_empty (dwarf2_section_info_def, dwarf2_per_objfile->types)
22282 && die->child != NULL
22283 && (die->tag == DW_TAG_class_type
22284 || die->tag == DW_TAG_structure_type
22285 || die->tag == DW_TAG_union_type))
22287 char *name = guess_full_die_structure_name (die, cu);
22292 case DW_TAG_enumeration_type:
22293 parent_type = read_type_die (parent, cu);
22294 if (TYPE_DECLARED_CLASS (parent_type))
22296 if (TYPE_TAG_NAME (parent_type) != NULL)
22297 return TYPE_TAG_NAME (parent_type);
22300 /* Fall through. */
22302 return determine_prefix (parent, cu);
22306 /* Return a newly-allocated string formed by concatenating PREFIX and SUFFIX
22307 with appropriate separator. If PREFIX or SUFFIX is NULL or empty, then
22308 simply copy the SUFFIX or PREFIX, respectively. If OBS is non-null, perform
22309 an obconcat, otherwise allocate storage for the result. The CU argument is
22310 used to determine the language and hence, the appropriate separator. */
22312 #define MAX_SEP_LEN 7 /* strlen ("__") + strlen ("_MOD_") */
22315 typename_concat (struct obstack *obs, const char *prefix, const char *suffix,
22316 int physname, struct dwarf2_cu *cu)
22318 const char *lead = "";
22321 if (suffix == NULL || suffix[0] == '\0'
22322 || prefix == NULL || prefix[0] == '\0')
22324 else if (cu->language == language_d)
22326 /* For D, the 'main' function could be defined in any module, but it
22327 should never be prefixed. */
22328 if (strcmp (suffix, "D main") == 0)
22336 else if (cu->language == language_fortran && physname)
22338 /* This is gfortran specific mangling. Normally DW_AT_linkage_name or
22339 DW_AT_MIPS_linkage_name is preferred and used instead. */
22347 if (prefix == NULL)
22349 if (suffix == NULL)
22356 xmalloc (strlen (prefix) + MAX_SEP_LEN + strlen (suffix) + 1));
22358 strcpy (retval, lead);
22359 strcat (retval, prefix);
22360 strcat (retval, sep);
22361 strcat (retval, suffix);
22366 /* We have an obstack. */
22367 return obconcat (obs, lead, prefix, sep, suffix, (char *) NULL);
22371 /* Return sibling of die, NULL if no sibling. */
22373 static struct die_info *
22374 sibling_die (struct die_info *die)
22376 return die->sibling;
22379 /* Get name of a die, return NULL if not found. */
22381 static const char *
22382 dwarf2_canonicalize_name (const char *name, struct dwarf2_cu *cu,
22383 struct obstack *obstack)
22385 if (name && cu->language == language_cplus)
22387 std::string canon_name = cp_canonicalize_string (name);
22389 if (!canon_name.empty ())
22391 if (canon_name != name)
22392 name = (const char *) obstack_copy0 (obstack,
22393 canon_name.c_str (),
22394 canon_name.length ());
22401 /* Get name of a die, return NULL if not found.
22402 Anonymous namespaces are converted to their magic string. */
22404 static const char *
22405 dwarf2_name (struct die_info *die, struct dwarf2_cu *cu)
22407 struct attribute *attr;
22408 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
22410 attr = dwarf2_attr (die, DW_AT_name, cu);
22411 if ((!attr || !DW_STRING (attr))
22412 && die->tag != DW_TAG_namespace
22413 && die->tag != DW_TAG_class_type
22414 && die->tag != DW_TAG_interface_type
22415 && die->tag != DW_TAG_structure_type
22416 && die->tag != DW_TAG_union_type)
22421 case DW_TAG_compile_unit:
22422 case DW_TAG_partial_unit:
22423 /* Compilation units have a DW_AT_name that is a filename, not
22424 a source language identifier. */
22425 case DW_TAG_enumeration_type:
22426 case DW_TAG_enumerator:
22427 /* These tags always have simple identifiers already; no need
22428 to canonicalize them. */
22429 return DW_STRING (attr);
22431 case DW_TAG_namespace:
22432 if (attr != NULL && DW_STRING (attr) != NULL)
22433 return DW_STRING (attr);
22434 return CP_ANONYMOUS_NAMESPACE_STR;
22436 case DW_TAG_class_type:
22437 case DW_TAG_interface_type:
22438 case DW_TAG_structure_type:
22439 case DW_TAG_union_type:
22440 /* Some GCC versions emit spurious DW_AT_name attributes for unnamed
22441 structures or unions. These were of the form "._%d" in GCC 4.1,
22442 or simply "<anonymous struct>" or "<anonymous union>" in GCC 4.3
22443 and GCC 4.4. We work around this problem by ignoring these. */
22444 if (attr && DW_STRING (attr)
22445 && (startswith (DW_STRING (attr), "._")
22446 || startswith (DW_STRING (attr), "<anonymous")))
22449 /* GCC might emit a nameless typedef that has a linkage name. See
22450 http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47510. */
22451 if (!attr || DW_STRING (attr) == NULL)
22453 char *demangled = NULL;
22455 attr = dw2_linkage_name_attr (die, cu);
22456 if (attr == NULL || DW_STRING (attr) == NULL)
22459 /* Avoid demangling DW_STRING (attr) the second time on a second
22460 call for the same DIE. */
22461 if (!DW_STRING_IS_CANONICAL (attr))
22462 demangled = gdb_demangle (DW_STRING (attr), DMGL_TYPES);
22468 /* FIXME: we already did this for the partial symbol... */
22471 obstack_copy0 (&objfile->per_bfd->storage_obstack,
22472 demangled, strlen (demangled)));
22473 DW_STRING_IS_CANONICAL (attr) = 1;
22476 /* Strip any leading namespaces/classes, keep only the base name.
22477 DW_AT_name for named DIEs does not contain the prefixes. */
22478 base = strrchr (DW_STRING (attr), ':');
22479 if (base && base > DW_STRING (attr) && base[-1] == ':')
22482 return DW_STRING (attr);
22491 if (!DW_STRING_IS_CANONICAL (attr))
22494 = dwarf2_canonicalize_name (DW_STRING (attr), cu,
22495 &objfile->per_bfd->storage_obstack);
22496 DW_STRING_IS_CANONICAL (attr) = 1;
22498 return DW_STRING (attr);
22501 /* Return the die that this die in an extension of, or NULL if there
22502 is none. *EXT_CU is the CU containing DIE on input, and the CU
22503 containing the return value on output. */
22505 static struct die_info *
22506 dwarf2_extension (struct die_info *die, struct dwarf2_cu **ext_cu)
22508 struct attribute *attr;
22510 attr = dwarf2_attr (die, DW_AT_extension, *ext_cu);
22514 return follow_die_ref (die, attr, ext_cu);
22517 /* Convert a DIE tag into its string name. */
22519 static const char *
22520 dwarf_tag_name (unsigned tag)
22522 const char *name = get_DW_TAG_name (tag);
22525 return "DW_TAG_<unknown>";
22530 /* Convert a DWARF attribute code into its string name. */
22532 static const char *
22533 dwarf_attr_name (unsigned attr)
22537 #ifdef MIPS /* collides with DW_AT_HP_block_index */
22538 if (attr == DW_AT_MIPS_fde)
22539 return "DW_AT_MIPS_fde";
22541 if (attr == DW_AT_HP_block_index)
22542 return "DW_AT_HP_block_index";
22545 name = get_DW_AT_name (attr);
22548 return "DW_AT_<unknown>";
22553 /* Convert a DWARF value form code into its string name. */
22555 static const char *
22556 dwarf_form_name (unsigned form)
22558 const char *name = get_DW_FORM_name (form);
22561 return "DW_FORM_<unknown>";
22566 static const char *
22567 dwarf_bool_name (unsigned mybool)
22575 /* Convert a DWARF type code into its string name. */
22577 static const char *
22578 dwarf_type_encoding_name (unsigned enc)
22580 const char *name = get_DW_ATE_name (enc);
22583 return "DW_ATE_<unknown>";
22589 dump_die_shallow (struct ui_file *f, int indent, struct die_info *die)
22593 print_spaces (indent, f);
22594 fprintf_unfiltered (f, "Die: %s (abbrev %d, offset %s)\n",
22595 dwarf_tag_name (die->tag), die->abbrev,
22596 sect_offset_str (die->sect_off));
22598 if (die->parent != NULL)
22600 print_spaces (indent, f);
22601 fprintf_unfiltered (f, " parent at offset: %s\n",
22602 sect_offset_str (die->parent->sect_off));
22605 print_spaces (indent, f);
22606 fprintf_unfiltered (f, " has children: %s\n",
22607 dwarf_bool_name (die->child != NULL));
22609 print_spaces (indent, f);
22610 fprintf_unfiltered (f, " attributes:\n");
22612 for (i = 0; i < die->num_attrs; ++i)
22614 print_spaces (indent, f);
22615 fprintf_unfiltered (f, " %s (%s) ",
22616 dwarf_attr_name (die->attrs[i].name),
22617 dwarf_form_name (die->attrs[i].form));
22619 switch (die->attrs[i].form)
22622 case DW_FORM_GNU_addr_index:
22623 fprintf_unfiltered (f, "address: ");
22624 fputs_filtered (hex_string (DW_ADDR (&die->attrs[i])), f);
22626 case DW_FORM_block2:
22627 case DW_FORM_block4:
22628 case DW_FORM_block:
22629 case DW_FORM_block1:
22630 fprintf_unfiltered (f, "block: size %s",
22631 pulongest (DW_BLOCK (&die->attrs[i])->size));
22633 case DW_FORM_exprloc:
22634 fprintf_unfiltered (f, "expression: size %s",
22635 pulongest (DW_BLOCK (&die->attrs[i])->size));
22637 case DW_FORM_data16:
22638 fprintf_unfiltered (f, "constant of 16 bytes");
22640 case DW_FORM_ref_addr:
22641 fprintf_unfiltered (f, "ref address: ");
22642 fputs_filtered (hex_string (DW_UNSND (&die->attrs[i])), f);
22644 case DW_FORM_GNU_ref_alt:
22645 fprintf_unfiltered (f, "alt ref address: ");
22646 fputs_filtered (hex_string (DW_UNSND (&die->attrs[i])), f);
22652 case DW_FORM_ref_udata:
22653 fprintf_unfiltered (f, "constant ref: 0x%lx (adjusted)",
22654 (long) (DW_UNSND (&die->attrs[i])));
22656 case DW_FORM_data1:
22657 case DW_FORM_data2:
22658 case DW_FORM_data4:
22659 case DW_FORM_data8:
22660 case DW_FORM_udata:
22661 case DW_FORM_sdata:
22662 fprintf_unfiltered (f, "constant: %s",
22663 pulongest (DW_UNSND (&die->attrs[i])));
22665 case DW_FORM_sec_offset:
22666 fprintf_unfiltered (f, "section offset: %s",
22667 pulongest (DW_UNSND (&die->attrs[i])));
22669 case DW_FORM_ref_sig8:
22670 fprintf_unfiltered (f, "signature: %s",
22671 hex_string (DW_SIGNATURE (&die->attrs[i])));
22673 case DW_FORM_string:
22675 case DW_FORM_line_strp:
22676 case DW_FORM_GNU_str_index:
22677 case DW_FORM_GNU_strp_alt:
22678 fprintf_unfiltered (f, "string: \"%s\" (%s canonicalized)",
22679 DW_STRING (&die->attrs[i])
22680 ? DW_STRING (&die->attrs[i]) : "",
22681 DW_STRING_IS_CANONICAL (&die->attrs[i]) ? "is" : "not");
22684 if (DW_UNSND (&die->attrs[i]))
22685 fprintf_unfiltered (f, "flag: TRUE");
22687 fprintf_unfiltered (f, "flag: FALSE");
22689 case DW_FORM_flag_present:
22690 fprintf_unfiltered (f, "flag: TRUE");
22692 case DW_FORM_indirect:
22693 /* The reader will have reduced the indirect form to
22694 the "base form" so this form should not occur. */
22695 fprintf_unfiltered (f,
22696 "unexpected attribute form: DW_FORM_indirect");
22698 case DW_FORM_implicit_const:
22699 fprintf_unfiltered (f, "constant: %s",
22700 plongest (DW_SND (&die->attrs[i])));
22703 fprintf_unfiltered (f, "unsupported attribute form: %d.",
22704 die->attrs[i].form);
22707 fprintf_unfiltered (f, "\n");
22712 dump_die_for_error (struct die_info *die)
22714 dump_die_shallow (gdb_stderr, 0, die);
22718 dump_die_1 (struct ui_file *f, int level, int max_level, struct die_info *die)
22720 int indent = level * 4;
22722 gdb_assert (die != NULL);
22724 if (level >= max_level)
22727 dump_die_shallow (f, indent, die);
22729 if (die->child != NULL)
22731 print_spaces (indent, f);
22732 fprintf_unfiltered (f, " Children:");
22733 if (level + 1 < max_level)
22735 fprintf_unfiltered (f, "\n");
22736 dump_die_1 (f, level + 1, max_level, die->child);
22740 fprintf_unfiltered (f,
22741 " [not printed, max nesting level reached]\n");
22745 if (die->sibling != NULL && level > 0)
22747 dump_die_1 (f, level, max_level, die->sibling);
22751 /* This is called from the pdie macro in gdbinit.in.
22752 It's not static so gcc will keep a copy callable from gdb. */
22755 dump_die (struct die_info *die, int max_level)
22757 dump_die_1 (gdb_stdlog, 0, max_level, die);
22761 store_in_ref_table (struct die_info *die, struct dwarf2_cu *cu)
22765 slot = htab_find_slot_with_hash (cu->die_hash, die,
22766 to_underlying (die->sect_off),
22772 /* Return DIE offset of ATTR. Return 0 with complaint if ATTR is not of the
22776 dwarf2_get_ref_die_offset (const struct attribute *attr)
22778 if (attr_form_is_ref (attr))
22779 return (sect_offset) DW_UNSND (attr);
22781 complaint (&symfile_complaints,
22782 _("unsupported die ref attribute form: '%s'"),
22783 dwarf_form_name (attr->form));
22787 /* Return the constant value held by ATTR. Return DEFAULT_VALUE if
22788 * the value held by the attribute is not constant. */
22791 dwarf2_get_attr_constant_value (const struct attribute *attr, int default_value)
22793 if (attr->form == DW_FORM_sdata || attr->form == DW_FORM_implicit_const)
22794 return DW_SND (attr);
22795 else if (attr->form == DW_FORM_udata
22796 || attr->form == DW_FORM_data1
22797 || attr->form == DW_FORM_data2
22798 || attr->form == DW_FORM_data4
22799 || attr->form == DW_FORM_data8)
22800 return DW_UNSND (attr);
22803 /* For DW_FORM_data16 see attr_form_is_constant. */
22804 complaint (&symfile_complaints,
22805 _("Attribute value is not a constant (%s)"),
22806 dwarf_form_name (attr->form));
22807 return default_value;
22811 /* Follow reference or signature attribute ATTR of SRC_DIE.
22812 On entry *REF_CU is the CU of SRC_DIE.
22813 On exit *REF_CU is the CU of the result. */
22815 static struct die_info *
22816 follow_die_ref_or_sig (struct die_info *src_die, const struct attribute *attr,
22817 struct dwarf2_cu **ref_cu)
22819 struct die_info *die;
22821 if (attr_form_is_ref (attr))
22822 die = follow_die_ref (src_die, attr, ref_cu);
22823 else if (attr->form == DW_FORM_ref_sig8)
22824 die = follow_die_sig (src_die, attr, ref_cu);
22827 dump_die_for_error (src_die);
22828 error (_("Dwarf Error: Expected reference attribute [in module %s]"),
22829 objfile_name ((*ref_cu)->per_cu->dwarf2_per_objfile->objfile));
22835 /* Follow reference OFFSET.
22836 On entry *REF_CU is the CU of the source die referencing OFFSET.
22837 On exit *REF_CU is the CU of the result.
22838 Returns NULL if OFFSET is invalid. */
22840 static struct die_info *
22841 follow_die_offset (sect_offset sect_off, int offset_in_dwz,
22842 struct dwarf2_cu **ref_cu)
22844 struct die_info temp_die;
22845 struct dwarf2_cu *target_cu, *cu = *ref_cu;
22846 struct dwarf2_per_objfile *dwarf2_per_objfile
22847 = cu->per_cu->dwarf2_per_objfile;
22849 gdb_assert (cu->per_cu != NULL);
22853 if (cu->per_cu->is_debug_types)
22855 /* .debug_types CUs cannot reference anything outside their CU.
22856 If they need to, they have to reference a signatured type via
22857 DW_FORM_ref_sig8. */
22858 if (!offset_in_cu_p (&cu->header, sect_off))
22861 else if (offset_in_dwz != cu->per_cu->is_dwz
22862 || !offset_in_cu_p (&cu->header, sect_off))
22864 struct dwarf2_per_cu_data *per_cu;
22866 per_cu = dwarf2_find_containing_comp_unit (sect_off, offset_in_dwz,
22867 dwarf2_per_objfile);
22869 /* If necessary, add it to the queue and load its DIEs. */
22870 if (maybe_queue_comp_unit (cu, per_cu, cu->language))
22871 load_full_comp_unit (per_cu, cu->language);
22873 target_cu = per_cu->cu;
22875 else if (cu->dies == NULL)
22877 /* We're loading full DIEs during partial symbol reading. */
22878 gdb_assert (dwarf2_per_objfile->reading_partial_symbols);
22879 load_full_comp_unit (cu->per_cu, language_minimal);
22882 *ref_cu = target_cu;
22883 temp_die.sect_off = sect_off;
22884 return (struct die_info *) htab_find_with_hash (target_cu->die_hash,
22886 to_underlying (sect_off));
22889 /* Follow reference attribute ATTR of SRC_DIE.
22890 On entry *REF_CU is the CU of SRC_DIE.
22891 On exit *REF_CU is the CU of the result. */
22893 static struct die_info *
22894 follow_die_ref (struct die_info *src_die, const struct attribute *attr,
22895 struct dwarf2_cu **ref_cu)
22897 sect_offset sect_off = dwarf2_get_ref_die_offset (attr);
22898 struct dwarf2_cu *cu = *ref_cu;
22899 struct die_info *die;
22901 die = follow_die_offset (sect_off,
22902 (attr->form == DW_FORM_GNU_ref_alt
22903 || cu->per_cu->is_dwz),
22906 error (_("Dwarf Error: Cannot find DIE at %s referenced from DIE "
22907 "at %s [in module %s]"),
22908 sect_offset_str (sect_off), sect_offset_str (src_die->sect_off),
22909 objfile_name (cu->per_cu->dwarf2_per_objfile->objfile));
22914 /* Return DWARF block referenced by DW_AT_location of DIE at SECT_OFF at PER_CU.
22915 Returned value is intended for DW_OP_call*. Returned
22916 dwarf2_locexpr_baton->data has lifetime of
22917 PER_CU->DWARF2_PER_OBJFILE->OBJFILE. */
22919 struct dwarf2_locexpr_baton
22920 dwarf2_fetch_die_loc_sect_off (sect_offset sect_off,
22921 struct dwarf2_per_cu_data *per_cu,
22922 CORE_ADDR (*get_frame_pc) (void *baton),
22925 struct dwarf2_cu *cu;
22926 struct die_info *die;
22927 struct attribute *attr;
22928 struct dwarf2_locexpr_baton retval;
22929 struct objfile *objfile = per_cu->dwarf2_per_objfile->objfile;
22930 struct dwarf2_per_objfile *dwarf2_per_objfile
22931 = get_dwarf2_per_objfile (objfile);
22933 if (per_cu->cu == NULL)
22938 /* We shouldn't get here for a dummy CU, but don't crash on the user.
22939 Instead just throw an error, not much else we can do. */
22940 error (_("Dwarf Error: Dummy CU at %s referenced in module %s"),
22941 sect_offset_str (sect_off), objfile_name (objfile));
22944 die = follow_die_offset (sect_off, per_cu->is_dwz, &cu);
22946 error (_("Dwarf Error: Cannot find DIE at %s referenced in module %s"),
22947 sect_offset_str (sect_off), objfile_name (objfile));
22949 attr = dwarf2_attr (die, DW_AT_location, cu);
22952 /* DWARF: "If there is no such attribute, then there is no effect.".
22953 DATA is ignored if SIZE is 0. */
22955 retval.data = NULL;
22958 else if (attr_form_is_section_offset (attr))
22960 struct dwarf2_loclist_baton loclist_baton;
22961 CORE_ADDR pc = (*get_frame_pc) (baton);
22964 fill_in_loclist_baton (cu, &loclist_baton, attr);
22966 retval.data = dwarf2_find_location_expression (&loclist_baton,
22968 retval.size = size;
22972 if (!attr_form_is_block (attr))
22973 error (_("Dwarf Error: DIE at %s referenced in module %s "
22974 "is neither DW_FORM_block* nor DW_FORM_exprloc"),
22975 sect_offset_str (sect_off), objfile_name (objfile));
22977 retval.data = DW_BLOCK (attr)->data;
22978 retval.size = DW_BLOCK (attr)->size;
22980 retval.per_cu = cu->per_cu;
22982 age_cached_comp_units (dwarf2_per_objfile);
22987 /* Like dwarf2_fetch_die_loc_sect_off, but take a CU
22990 struct dwarf2_locexpr_baton
22991 dwarf2_fetch_die_loc_cu_off (cu_offset offset_in_cu,
22992 struct dwarf2_per_cu_data *per_cu,
22993 CORE_ADDR (*get_frame_pc) (void *baton),
22996 sect_offset sect_off = per_cu->sect_off + to_underlying (offset_in_cu);
22998 return dwarf2_fetch_die_loc_sect_off (sect_off, per_cu, get_frame_pc, baton);
23001 /* Write a constant of a given type as target-ordered bytes into
23004 static const gdb_byte *
23005 write_constant_as_bytes (struct obstack *obstack,
23006 enum bfd_endian byte_order,
23013 *len = TYPE_LENGTH (type);
23014 result = (gdb_byte *) obstack_alloc (obstack, *len);
23015 store_unsigned_integer (result, *len, byte_order, value);
23020 /* If the DIE at OFFSET in PER_CU has a DW_AT_const_value, return a
23021 pointer to the constant bytes and set LEN to the length of the
23022 data. If memory is needed, allocate it on OBSTACK. If the DIE
23023 does not have a DW_AT_const_value, return NULL. */
23026 dwarf2_fetch_constant_bytes (sect_offset sect_off,
23027 struct dwarf2_per_cu_data *per_cu,
23028 struct obstack *obstack,
23031 struct dwarf2_cu *cu;
23032 struct die_info *die;
23033 struct attribute *attr;
23034 const gdb_byte *result = NULL;
23037 enum bfd_endian byte_order;
23038 struct objfile *objfile = per_cu->dwarf2_per_objfile->objfile;
23040 if (per_cu->cu == NULL)
23045 /* We shouldn't get here for a dummy CU, but don't crash on the user.
23046 Instead just throw an error, not much else we can do. */
23047 error (_("Dwarf Error: Dummy CU at %s referenced in module %s"),
23048 sect_offset_str (sect_off), objfile_name (objfile));
23051 die = follow_die_offset (sect_off, per_cu->is_dwz, &cu);
23053 error (_("Dwarf Error: Cannot find DIE at %s referenced in module %s"),
23054 sect_offset_str (sect_off), objfile_name (objfile));
23056 attr = dwarf2_attr (die, DW_AT_const_value, cu);
23060 byte_order = (bfd_big_endian (objfile->obfd)
23061 ? BFD_ENDIAN_BIG : BFD_ENDIAN_LITTLE);
23063 switch (attr->form)
23066 case DW_FORM_GNU_addr_index:
23070 *len = cu->header.addr_size;
23071 tem = (gdb_byte *) obstack_alloc (obstack, *len);
23072 store_unsigned_integer (tem, *len, byte_order, DW_ADDR (attr));
23076 case DW_FORM_string:
23078 case DW_FORM_GNU_str_index:
23079 case DW_FORM_GNU_strp_alt:
23080 /* DW_STRING is already allocated on the objfile obstack, point
23082 result = (const gdb_byte *) DW_STRING (attr);
23083 *len = strlen (DW_STRING (attr));
23085 case DW_FORM_block1:
23086 case DW_FORM_block2:
23087 case DW_FORM_block4:
23088 case DW_FORM_block:
23089 case DW_FORM_exprloc:
23090 case DW_FORM_data16:
23091 result = DW_BLOCK (attr)->data;
23092 *len = DW_BLOCK (attr)->size;
23095 /* The DW_AT_const_value attributes are supposed to carry the
23096 symbol's value "represented as it would be on the target
23097 architecture." By the time we get here, it's already been
23098 converted to host endianness, so we just need to sign- or
23099 zero-extend it as appropriate. */
23100 case DW_FORM_data1:
23101 type = die_type (die, cu);
23102 result = dwarf2_const_value_data (attr, obstack, cu, &value, 8);
23103 if (result == NULL)
23104 result = write_constant_as_bytes (obstack, byte_order,
23107 case DW_FORM_data2:
23108 type = die_type (die, cu);
23109 result = dwarf2_const_value_data (attr, obstack, cu, &value, 16);
23110 if (result == NULL)
23111 result = write_constant_as_bytes (obstack, byte_order,
23114 case DW_FORM_data4:
23115 type = die_type (die, cu);
23116 result = dwarf2_const_value_data (attr, obstack, cu, &value, 32);
23117 if (result == NULL)
23118 result = write_constant_as_bytes (obstack, byte_order,
23121 case DW_FORM_data8:
23122 type = die_type (die, cu);
23123 result = dwarf2_const_value_data (attr, obstack, cu, &value, 64);
23124 if (result == NULL)
23125 result = write_constant_as_bytes (obstack, byte_order,
23129 case DW_FORM_sdata:
23130 case DW_FORM_implicit_const:
23131 type = die_type (die, cu);
23132 result = write_constant_as_bytes (obstack, byte_order,
23133 type, DW_SND (attr), len);
23136 case DW_FORM_udata:
23137 type = die_type (die, cu);
23138 result = write_constant_as_bytes (obstack, byte_order,
23139 type, DW_UNSND (attr), len);
23143 complaint (&symfile_complaints,
23144 _("unsupported const value attribute form: '%s'"),
23145 dwarf_form_name (attr->form));
23152 /* Return the type of the die at OFFSET in PER_CU. Return NULL if no
23153 valid type for this die is found. */
23156 dwarf2_fetch_die_type_sect_off (sect_offset sect_off,
23157 struct dwarf2_per_cu_data *per_cu)
23159 struct dwarf2_cu *cu;
23160 struct die_info *die;
23162 if (per_cu->cu == NULL)
23168 die = follow_die_offset (sect_off, per_cu->is_dwz, &cu);
23172 return die_type (die, cu);
23175 /* Return the type of the DIE at DIE_OFFSET in the CU named by
23179 dwarf2_get_die_type (cu_offset die_offset,
23180 struct dwarf2_per_cu_data *per_cu)
23182 sect_offset die_offset_sect = per_cu->sect_off + to_underlying (die_offset);
23183 return get_die_type_at_offset (die_offset_sect, per_cu);
23186 /* Follow type unit SIG_TYPE referenced by SRC_DIE.
23187 On entry *REF_CU is the CU of SRC_DIE.
23188 On exit *REF_CU is the CU of the result.
23189 Returns NULL if the referenced DIE isn't found. */
23191 static struct die_info *
23192 follow_die_sig_1 (struct die_info *src_die, struct signatured_type *sig_type,
23193 struct dwarf2_cu **ref_cu)
23195 struct die_info temp_die;
23196 struct dwarf2_cu *sig_cu;
23197 struct die_info *die;
23199 /* While it might be nice to assert sig_type->type == NULL here,
23200 we can get here for DW_AT_imported_declaration where we need
23201 the DIE not the type. */
23203 /* If necessary, add it to the queue and load its DIEs. */
23205 if (maybe_queue_comp_unit (*ref_cu, &sig_type->per_cu, language_minimal))
23206 read_signatured_type (sig_type);
23208 sig_cu = sig_type->per_cu.cu;
23209 gdb_assert (sig_cu != NULL);
23210 gdb_assert (to_underlying (sig_type->type_offset_in_section) != 0);
23211 temp_die.sect_off = sig_type->type_offset_in_section;
23212 die = (struct die_info *) htab_find_with_hash (sig_cu->die_hash, &temp_die,
23213 to_underlying (temp_die.sect_off));
23216 struct dwarf2_per_objfile *dwarf2_per_objfile
23217 = (*ref_cu)->per_cu->dwarf2_per_objfile;
23219 /* For .gdb_index version 7 keep track of included TUs.
23220 http://sourceware.org/bugzilla/show_bug.cgi?id=15021. */
23221 if (dwarf2_per_objfile->index_table != NULL
23222 && dwarf2_per_objfile->index_table->version <= 7)
23224 VEC_safe_push (dwarf2_per_cu_ptr,
23225 (*ref_cu)->per_cu->imported_symtabs,
23236 /* Follow signatured type referenced by ATTR in SRC_DIE.
23237 On entry *REF_CU is the CU of SRC_DIE.
23238 On exit *REF_CU is the CU of the result.
23239 The result is the DIE of the type.
23240 If the referenced type cannot be found an error is thrown. */
23242 static struct die_info *
23243 follow_die_sig (struct die_info *src_die, const struct attribute *attr,
23244 struct dwarf2_cu **ref_cu)
23246 ULONGEST signature = DW_SIGNATURE (attr);
23247 struct signatured_type *sig_type;
23248 struct die_info *die;
23250 gdb_assert (attr->form == DW_FORM_ref_sig8);
23252 sig_type = lookup_signatured_type (*ref_cu, signature);
23253 /* sig_type will be NULL if the signatured type is missing from
23255 if (sig_type == NULL)
23257 error (_("Dwarf Error: Cannot find signatured DIE %s referenced"
23258 " from DIE at %s [in module %s]"),
23259 hex_string (signature), sect_offset_str (src_die->sect_off),
23260 objfile_name ((*ref_cu)->per_cu->dwarf2_per_objfile->objfile));
23263 die = follow_die_sig_1 (src_die, sig_type, ref_cu);
23266 dump_die_for_error (src_die);
23267 error (_("Dwarf Error: Problem reading signatured DIE %s referenced"
23268 " from DIE at %s [in module %s]"),
23269 hex_string (signature), sect_offset_str (src_die->sect_off),
23270 objfile_name ((*ref_cu)->per_cu->dwarf2_per_objfile->objfile));
23276 /* Get the type specified by SIGNATURE referenced in DIE/CU,
23277 reading in and processing the type unit if necessary. */
23279 static struct type *
23280 get_signatured_type (struct die_info *die, ULONGEST signature,
23281 struct dwarf2_cu *cu)
23283 struct dwarf2_per_objfile *dwarf2_per_objfile
23284 = cu->per_cu->dwarf2_per_objfile;
23285 struct signatured_type *sig_type;
23286 struct dwarf2_cu *type_cu;
23287 struct die_info *type_die;
23290 sig_type = lookup_signatured_type (cu, signature);
23291 /* sig_type will be NULL if the signatured type is missing from
23293 if (sig_type == NULL)
23295 complaint (&symfile_complaints,
23296 _("Dwarf Error: Cannot find signatured DIE %s referenced"
23297 " from DIE at %s [in module %s]"),
23298 hex_string (signature), sect_offset_str (die->sect_off),
23299 objfile_name (dwarf2_per_objfile->objfile));
23300 return build_error_marker_type (cu, die);
23303 /* If we already know the type we're done. */
23304 if (sig_type->type != NULL)
23305 return sig_type->type;
23308 type_die = follow_die_sig_1 (die, sig_type, &type_cu);
23309 if (type_die != NULL)
23311 /* N.B. We need to call get_die_type to ensure only one type for this DIE
23312 is created. This is important, for example, because for c++ classes
23313 we need TYPE_NAME set which is only done by new_symbol. Blech. */
23314 type = read_type_die (type_die, type_cu);
23317 complaint (&symfile_complaints,
23318 _("Dwarf Error: Cannot build signatured type %s"
23319 " referenced from DIE at %s [in module %s]"),
23320 hex_string (signature), sect_offset_str (die->sect_off),
23321 objfile_name (dwarf2_per_objfile->objfile));
23322 type = build_error_marker_type (cu, die);
23327 complaint (&symfile_complaints,
23328 _("Dwarf Error: Problem reading signatured DIE %s referenced"
23329 " from DIE at %s [in module %s]"),
23330 hex_string (signature), sect_offset_str (die->sect_off),
23331 objfile_name (dwarf2_per_objfile->objfile));
23332 type = build_error_marker_type (cu, die);
23334 sig_type->type = type;
23339 /* Get the type specified by the DW_AT_signature ATTR in DIE/CU,
23340 reading in and processing the type unit if necessary. */
23342 static struct type *
23343 get_DW_AT_signature_type (struct die_info *die, const struct attribute *attr,
23344 struct dwarf2_cu *cu) /* ARI: editCase function */
23346 /* Yes, DW_AT_signature can use a non-ref_sig8 reference. */
23347 if (attr_form_is_ref (attr))
23349 struct dwarf2_cu *type_cu = cu;
23350 struct die_info *type_die = follow_die_ref (die, attr, &type_cu);
23352 return read_type_die (type_die, type_cu);
23354 else if (attr->form == DW_FORM_ref_sig8)
23356 return get_signatured_type (die, DW_SIGNATURE (attr), cu);
23360 struct dwarf2_per_objfile *dwarf2_per_objfile
23361 = cu->per_cu->dwarf2_per_objfile;
23363 complaint (&symfile_complaints,
23364 _("Dwarf Error: DW_AT_signature has bad form %s in DIE"
23365 " at %s [in module %s]"),
23366 dwarf_form_name (attr->form), sect_offset_str (die->sect_off),
23367 objfile_name (dwarf2_per_objfile->objfile));
23368 return build_error_marker_type (cu, die);
23372 /* Load the DIEs associated with type unit PER_CU into memory. */
23375 load_full_type_unit (struct dwarf2_per_cu_data *per_cu)
23377 struct signatured_type *sig_type;
23379 /* Caller is responsible for ensuring type_unit_groups don't get here. */
23380 gdb_assert (! IS_TYPE_UNIT_GROUP (per_cu));
23382 /* We have the per_cu, but we need the signatured_type.
23383 Fortunately this is an easy translation. */
23384 gdb_assert (per_cu->is_debug_types);
23385 sig_type = (struct signatured_type *) per_cu;
23387 gdb_assert (per_cu->cu == NULL);
23389 read_signatured_type (sig_type);
23391 gdb_assert (per_cu->cu != NULL);
23394 /* die_reader_func for read_signatured_type.
23395 This is identical to load_full_comp_unit_reader,
23396 but is kept separate for now. */
23399 read_signatured_type_reader (const struct die_reader_specs *reader,
23400 const gdb_byte *info_ptr,
23401 struct die_info *comp_unit_die,
23405 struct dwarf2_cu *cu = reader->cu;
23407 gdb_assert (cu->die_hash == NULL);
23409 htab_create_alloc_ex (cu->header.length / 12,
23413 &cu->comp_unit_obstack,
23414 hashtab_obstack_allocate,
23415 dummy_obstack_deallocate);
23418 comp_unit_die->child = read_die_and_siblings (reader, info_ptr,
23419 &info_ptr, comp_unit_die);
23420 cu->dies = comp_unit_die;
23421 /* comp_unit_die is not stored in die_hash, no need. */
23423 /* We try not to read any attributes in this function, because not
23424 all CUs needed for references have been loaded yet, and symbol
23425 table processing isn't initialized. But we have to set the CU language,
23426 or we won't be able to build types correctly.
23427 Similarly, if we do not read the producer, we can not apply
23428 producer-specific interpretation. */
23429 prepare_one_comp_unit (cu, cu->dies, language_minimal);
23432 /* Read in a signatured type and build its CU and DIEs.
23433 If the type is a stub for the real type in a DWO file,
23434 read in the real type from the DWO file as well. */
23437 read_signatured_type (struct signatured_type *sig_type)
23439 struct dwarf2_per_cu_data *per_cu = &sig_type->per_cu;
23441 gdb_assert (per_cu->is_debug_types);
23442 gdb_assert (per_cu->cu == NULL);
23444 init_cutu_and_read_dies (per_cu, NULL, 0, 1,
23445 read_signatured_type_reader, NULL);
23446 sig_type->per_cu.tu_read = 1;
23449 /* Decode simple location descriptions.
23450 Given a pointer to a dwarf block that defines a location, compute
23451 the location and return the value.
23453 NOTE drow/2003-11-18: This function is called in two situations
23454 now: for the address of static or global variables (partial symbols
23455 only) and for offsets into structures which are expected to be
23456 (more or less) constant. The partial symbol case should go away,
23457 and only the constant case should remain. That will let this
23458 function complain more accurately. A few special modes are allowed
23459 without complaint for global variables (for instance, global
23460 register values and thread-local values).
23462 A location description containing no operations indicates that the
23463 object is optimized out. The return value is 0 for that case.
23464 FIXME drow/2003-11-16: No callers check for this case any more; soon all
23465 callers will only want a very basic result and this can become a
23468 Note that stack[0] is unused except as a default error return. */
23471 decode_locdesc (struct dwarf_block *blk, struct dwarf2_cu *cu)
23473 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
23475 size_t size = blk->size;
23476 const gdb_byte *data = blk->data;
23477 CORE_ADDR stack[64];
23479 unsigned int bytes_read, unsnd;
23485 stack[++stacki] = 0;
23524 stack[++stacki] = op - DW_OP_lit0;
23559 stack[++stacki] = op - DW_OP_reg0;
23561 dwarf2_complex_location_expr_complaint ();
23565 unsnd = read_unsigned_leb128 (NULL, (data + i), &bytes_read);
23567 stack[++stacki] = unsnd;
23569 dwarf2_complex_location_expr_complaint ();
23573 stack[++stacki] = read_address (objfile->obfd, &data[i],
23578 case DW_OP_const1u:
23579 stack[++stacki] = read_1_byte (objfile->obfd, &data[i]);
23583 case DW_OP_const1s:
23584 stack[++stacki] = read_1_signed_byte (objfile->obfd, &data[i]);
23588 case DW_OP_const2u:
23589 stack[++stacki] = read_2_bytes (objfile->obfd, &data[i]);
23593 case DW_OP_const2s:
23594 stack[++stacki] = read_2_signed_bytes (objfile->obfd, &data[i]);
23598 case DW_OP_const4u:
23599 stack[++stacki] = read_4_bytes (objfile->obfd, &data[i]);
23603 case DW_OP_const4s:
23604 stack[++stacki] = read_4_signed_bytes (objfile->obfd, &data[i]);
23608 case DW_OP_const8u:
23609 stack[++stacki] = read_8_bytes (objfile->obfd, &data[i]);
23614 stack[++stacki] = read_unsigned_leb128 (NULL, (data + i),
23620 stack[++stacki] = read_signed_leb128 (NULL, (data + i), &bytes_read);
23625 stack[stacki + 1] = stack[stacki];
23630 stack[stacki - 1] += stack[stacki];
23634 case DW_OP_plus_uconst:
23635 stack[stacki] += read_unsigned_leb128 (NULL, (data + i),
23641 stack[stacki - 1] -= stack[stacki];
23646 /* If we're not the last op, then we definitely can't encode
23647 this using GDB's address_class enum. This is valid for partial
23648 global symbols, although the variable's address will be bogus
23651 dwarf2_complex_location_expr_complaint ();
23654 case DW_OP_GNU_push_tls_address:
23655 case DW_OP_form_tls_address:
23656 /* The top of the stack has the offset from the beginning
23657 of the thread control block at which the variable is located. */
23658 /* Nothing should follow this operator, so the top of stack would
23660 /* This is valid for partial global symbols, but the variable's
23661 address will be bogus in the psymtab. Make it always at least
23662 non-zero to not look as a variable garbage collected by linker
23663 which have DW_OP_addr 0. */
23665 dwarf2_complex_location_expr_complaint ();
23669 case DW_OP_GNU_uninit:
23672 case DW_OP_GNU_addr_index:
23673 case DW_OP_GNU_const_index:
23674 stack[++stacki] = read_addr_index_from_leb128 (cu, &data[i],
23681 const char *name = get_DW_OP_name (op);
23684 complaint (&symfile_complaints, _("unsupported stack op: '%s'"),
23687 complaint (&symfile_complaints, _("unsupported stack op: '%02x'"),
23691 return (stack[stacki]);
23694 /* Enforce maximum stack depth of SIZE-1 to avoid writing
23695 outside of the allocated space. Also enforce minimum>0. */
23696 if (stacki >= ARRAY_SIZE (stack) - 1)
23698 complaint (&symfile_complaints,
23699 _("location description stack overflow"));
23705 complaint (&symfile_complaints,
23706 _("location description stack underflow"));
23710 return (stack[stacki]);
23713 /* memory allocation interface */
23715 static struct dwarf_block *
23716 dwarf_alloc_block (struct dwarf2_cu *cu)
23718 return XOBNEW (&cu->comp_unit_obstack, struct dwarf_block);
23721 static struct die_info *
23722 dwarf_alloc_die (struct dwarf2_cu *cu, int num_attrs)
23724 struct die_info *die;
23725 size_t size = sizeof (struct die_info);
23728 size += (num_attrs - 1) * sizeof (struct attribute);
23730 die = (struct die_info *) obstack_alloc (&cu->comp_unit_obstack, size);
23731 memset (die, 0, sizeof (struct die_info));
23736 /* Macro support. */
23738 /* Return file name relative to the compilation directory of file number I in
23739 *LH's file name table. The result is allocated using xmalloc; the caller is
23740 responsible for freeing it. */
23743 file_file_name (int file, struct line_header *lh)
23745 /* Is the file number a valid index into the line header's file name
23746 table? Remember that file numbers start with one, not zero. */
23747 if (1 <= file && file <= lh->file_names.size ())
23749 const file_entry &fe = lh->file_names[file - 1];
23751 if (!IS_ABSOLUTE_PATH (fe.name))
23753 const char *dir = fe.include_dir (lh);
23755 return concat (dir, SLASH_STRING, fe.name, (char *) NULL);
23757 return xstrdup (fe.name);
23761 /* The compiler produced a bogus file number. We can at least
23762 record the macro definitions made in the file, even if we
23763 won't be able to find the file by name. */
23764 char fake_name[80];
23766 xsnprintf (fake_name, sizeof (fake_name),
23767 "<bad macro file number %d>", file);
23769 complaint (&symfile_complaints,
23770 _("bad file number in macro information (%d)"),
23773 return xstrdup (fake_name);
23777 /* Return the full name of file number I in *LH's file name table.
23778 Use COMP_DIR as the name of the current directory of the
23779 compilation. The result is allocated using xmalloc; the caller is
23780 responsible for freeing it. */
23782 file_full_name (int file, struct line_header *lh, const char *comp_dir)
23784 /* Is the file number a valid index into the line header's file name
23785 table? Remember that file numbers start with one, not zero. */
23786 if (1 <= file && file <= lh->file_names.size ())
23788 char *relative = file_file_name (file, lh);
23790 if (IS_ABSOLUTE_PATH (relative) || comp_dir == NULL)
23792 return reconcat (relative, comp_dir, SLASH_STRING,
23793 relative, (char *) NULL);
23796 return file_file_name (file, lh);
23800 static struct macro_source_file *
23801 macro_start_file (int file, int line,
23802 struct macro_source_file *current_file,
23803 struct line_header *lh)
23805 /* File name relative to the compilation directory of this source file. */
23806 char *file_name = file_file_name (file, lh);
23808 if (! current_file)
23810 /* Note: We don't create a macro table for this compilation unit
23811 at all until we actually get a filename. */
23812 struct macro_table *macro_table = get_macro_table ();
23814 /* If we have no current file, then this must be the start_file
23815 directive for the compilation unit's main source file. */
23816 current_file = macro_set_main (macro_table, file_name);
23817 macro_define_special (macro_table);
23820 current_file = macro_include (current_file, line, file_name);
23824 return current_file;
23827 static const char *
23828 consume_improper_spaces (const char *p, const char *body)
23832 complaint (&symfile_complaints,
23833 _("macro definition contains spaces "
23834 "in formal argument list:\n`%s'"),
23846 parse_macro_definition (struct macro_source_file *file, int line,
23851 /* The body string takes one of two forms. For object-like macro
23852 definitions, it should be:
23854 <macro name> " " <definition>
23856 For function-like macro definitions, it should be:
23858 <macro name> "() " <definition>
23860 <macro name> "(" <arg name> ( "," <arg name> ) * ") " <definition>
23862 Spaces may appear only where explicitly indicated, and in the
23865 The Dwarf 2 spec says that an object-like macro's name is always
23866 followed by a space, but versions of GCC around March 2002 omit
23867 the space when the macro's definition is the empty string.
23869 The Dwarf 2 spec says that there should be no spaces between the
23870 formal arguments in a function-like macro's formal argument list,
23871 but versions of GCC around March 2002 include spaces after the
23875 /* Find the extent of the macro name. The macro name is terminated
23876 by either a space or null character (for an object-like macro) or
23877 an opening paren (for a function-like macro). */
23878 for (p = body; *p; p++)
23879 if (*p == ' ' || *p == '(')
23882 if (*p == ' ' || *p == '\0')
23884 /* It's an object-like macro. */
23885 int name_len = p - body;
23886 char *name = savestring (body, name_len);
23887 const char *replacement;
23890 replacement = body + name_len + 1;
23893 dwarf2_macro_malformed_definition_complaint (body);
23894 replacement = body + name_len;
23897 macro_define_object (file, line, name, replacement);
23901 else if (*p == '(')
23903 /* It's a function-like macro. */
23904 char *name = savestring (body, p - body);
23907 char **argv = XNEWVEC (char *, argv_size);
23911 p = consume_improper_spaces (p, body);
23913 /* Parse the formal argument list. */
23914 while (*p && *p != ')')
23916 /* Find the extent of the current argument name. */
23917 const char *arg_start = p;
23919 while (*p && *p != ',' && *p != ')' && *p != ' ')
23922 if (! *p || p == arg_start)
23923 dwarf2_macro_malformed_definition_complaint (body);
23926 /* Make sure argv has room for the new argument. */
23927 if (argc >= argv_size)
23930 argv = XRESIZEVEC (char *, argv, argv_size);
23933 argv[argc++] = savestring (arg_start, p - arg_start);
23936 p = consume_improper_spaces (p, body);
23938 /* Consume the comma, if present. */
23943 p = consume_improper_spaces (p, body);
23952 /* Perfectly formed definition, no complaints. */
23953 macro_define_function (file, line, name,
23954 argc, (const char **) argv,
23956 else if (*p == '\0')
23958 /* Complain, but do define it. */
23959 dwarf2_macro_malformed_definition_complaint (body);
23960 macro_define_function (file, line, name,
23961 argc, (const char **) argv,
23965 /* Just complain. */
23966 dwarf2_macro_malformed_definition_complaint (body);
23969 /* Just complain. */
23970 dwarf2_macro_malformed_definition_complaint (body);
23976 for (i = 0; i < argc; i++)
23982 dwarf2_macro_malformed_definition_complaint (body);
23985 /* Skip some bytes from BYTES according to the form given in FORM.
23986 Returns the new pointer. */
23988 static const gdb_byte *
23989 skip_form_bytes (bfd *abfd, const gdb_byte *bytes, const gdb_byte *buffer_end,
23990 enum dwarf_form form,
23991 unsigned int offset_size,
23992 struct dwarf2_section_info *section)
23994 unsigned int bytes_read;
23998 case DW_FORM_data1:
24003 case DW_FORM_data2:
24007 case DW_FORM_data4:
24011 case DW_FORM_data8:
24015 case DW_FORM_data16:
24019 case DW_FORM_string:
24020 read_direct_string (abfd, bytes, &bytes_read);
24021 bytes += bytes_read;
24024 case DW_FORM_sec_offset:
24026 case DW_FORM_GNU_strp_alt:
24027 bytes += offset_size;
24030 case DW_FORM_block:
24031 bytes += read_unsigned_leb128 (abfd, bytes, &bytes_read);
24032 bytes += bytes_read;
24035 case DW_FORM_block1:
24036 bytes += 1 + read_1_byte (abfd, bytes);
24038 case DW_FORM_block2:
24039 bytes += 2 + read_2_bytes (abfd, bytes);
24041 case DW_FORM_block4:
24042 bytes += 4 + read_4_bytes (abfd, bytes);
24045 case DW_FORM_sdata:
24046 case DW_FORM_udata:
24047 case DW_FORM_GNU_addr_index:
24048 case DW_FORM_GNU_str_index:
24049 bytes = gdb_skip_leb128 (bytes, buffer_end);
24052 dwarf2_section_buffer_overflow_complaint (section);
24057 case DW_FORM_implicit_const:
24062 complaint (&symfile_complaints,
24063 _("invalid form 0x%x in `%s'"),
24064 form, get_section_name (section));
24072 /* A helper for dwarf_decode_macros that handles skipping an unknown
24073 opcode. Returns an updated pointer to the macro data buffer; or,
24074 on error, issues a complaint and returns NULL. */
24076 static const gdb_byte *
24077 skip_unknown_opcode (unsigned int opcode,
24078 const gdb_byte **opcode_definitions,
24079 const gdb_byte *mac_ptr, const gdb_byte *mac_end,
24081 unsigned int offset_size,
24082 struct dwarf2_section_info *section)
24084 unsigned int bytes_read, i;
24086 const gdb_byte *defn;
24088 if (opcode_definitions[opcode] == NULL)
24090 complaint (&symfile_complaints,
24091 _("unrecognized DW_MACFINO opcode 0x%x"),
24096 defn = opcode_definitions[opcode];
24097 arg = read_unsigned_leb128 (abfd, defn, &bytes_read);
24098 defn += bytes_read;
24100 for (i = 0; i < arg; ++i)
24102 mac_ptr = skip_form_bytes (abfd, mac_ptr, mac_end,
24103 (enum dwarf_form) defn[i], offset_size,
24105 if (mac_ptr == NULL)
24107 /* skip_form_bytes already issued the complaint. */
24115 /* A helper function which parses the header of a macro section.
24116 If the macro section is the extended (for now called "GNU") type,
24117 then this updates *OFFSET_SIZE. Returns a pointer to just after
24118 the header, or issues a complaint and returns NULL on error. */
24120 static const gdb_byte *
24121 dwarf_parse_macro_header (const gdb_byte **opcode_definitions,
24123 const gdb_byte *mac_ptr,
24124 unsigned int *offset_size,
24125 int section_is_gnu)
24127 memset (opcode_definitions, 0, 256 * sizeof (gdb_byte *));
24129 if (section_is_gnu)
24131 unsigned int version, flags;
24133 version = read_2_bytes (abfd, mac_ptr);
24134 if (version != 4 && version != 5)
24136 complaint (&symfile_complaints,
24137 _("unrecognized version `%d' in .debug_macro section"),
24143 flags = read_1_byte (abfd, mac_ptr);
24145 *offset_size = (flags & 1) ? 8 : 4;
24147 if ((flags & 2) != 0)
24148 /* We don't need the line table offset. */
24149 mac_ptr += *offset_size;
24151 /* Vendor opcode descriptions. */
24152 if ((flags & 4) != 0)
24154 unsigned int i, count;
24156 count = read_1_byte (abfd, mac_ptr);
24158 for (i = 0; i < count; ++i)
24160 unsigned int opcode, bytes_read;
24163 opcode = read_1_byte (abfd, mac_ptr);
24165 opcode_definitions[opcode] = mac_ptr;
24166 arg = read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
24167 mac_ptr += bytes_read;
24176 /* A helper for dwarf_decode_macros that handles the GNU extensions,
24177 including DW_MACRO_import. */
24180 dwarf_decode_macro_bytes (struct dwarf2_per_objfile *dwarf2_per_objfile,
24182 const gdb_byte *mac_ptr, const gdb_byte *mac_end,
24183 struct macro_source_file *current_file,
24184 struct line_header *lh,
24185 struct dwarf2_section_info *section,
24186 int section_is_gnu, int section_is_dwz,
24187 unsigned int offset_size,
24188 htab_t include_hash)
24190 struct objfile *objfile = dwarf2_per_objfile->objfile;
24191 enum dwarf_macro_record_type macinfo_type;
24192 int at_commandline;
24193 const gdb_byte *opcode_definitions[256];
24195 mac_ptr = dwarf_parse_macro_header (opcode_definitions, abfd, mac_ptr,
24196 &offset_size, section_is_gnu);
24197 if (mac_ptr == NULL)
24199 /* We already issued a complaint. */
24203 /* Determines if GDB is still before first DW_MACINFO_start_file. If true
24204 GDB is still reading the definitions from command line. First
24205 DW_MACINFO_start_file will need to be ignored as it was already executed
24206 to create CURRENT_FILE for the main source holding also the command line
24207 definitions. On first met DW_MACINFO_start_file this flag is reset to
24208 normally execute all the remaining DW_MACINFO_start_file macinfos. */
24210 at_commandline = 1;
24214 /* Do we at least have room for a macinfo type byte? */
24215 if (mac_ptr >= mac_end)
24217 dwarf2_section_buffer_overflow_complaint (section);
24221 macinfo_type = (enum dwarf_macro_record_type) read_1_byte (abfd, mac_ptr);
24224 /* Note that we rely on the fact that the corresponding GNU and
24225 DWARF constants are the same. */
24227 DIAGNOSTIC_IGNORE_SWITCH_DIFFERENT_ENUM_TYPES
24228 switch (macinfo_type)
24230 /* A zero macinfo type indicates the end of the macro
24235 case DW_MACRO_define:
24236 case DW_MACRO_undef:
24237 case DW_MACRO_define_strp:
24238 case DW_MACRO_undef_strp:
24239 case DW_MACRO_define_sup:
24240 case DW_MACRO_undef_sup:
24242 unsigned int bytes_read;
24247 line = read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
24248 mac_ptr += bytes_read;
24250 if (macinfo_type == DW_MACRO_define
24251 || macinfo_type == DW_MACRO_undef)
24253 body = read_direct_string (abfd, mac_ptr, &bytes_read);
24254 mac_ptr += bytes_read;
24258 LONGEST str_offset;
24260 str_offset = read_offset_1 (abfd, mac_ptr, offset_size);
24261 mac_ptr += offset_size;
24263 if (macinfo_type == DW_MACRO_define_sup
24264 || macinfo_type == DW_MACRO_undef_sup
24267 struct dwz_file *dwz
24268 = dwarf2_get_dwz_file (dwarf2_per_objfile);
24270 body = read_indirect_string_from_dwz (objfile,
24274 body = read_indirect_string_at_offset (dwarf2_per_objfile,
24278 is_define = (macinfo_type == DW_MACRO_define
24279 || macinfo_type == DW_MACRO_define_strp
24280 || macinfo_type == DW_MACRO_define_sup);
24281 if (! current_file)
24283 /* DWARF violation as no main source is present. */
24284 complaint (&symfile_complaints,
24285 _("debug info with no main source gives macro %s "
24287 is_define ? _("definition") : _("undefinition"),
24291 if ((line == 0 && !at_commandline)
24292 || (line != 0 && at_commandline))
24293 complaint (&symfile_complaints,
24294 _("debug info gives %s macro %s with %s line %d: %s"),
24295 at_commandline ? _("command-line") : _("in-file"),
24296 is_define ? _("definition") : _("undefinition"),
24297 line == 0 ? _("zero") : _("non-zero"), line, body);
24300 parse_macro_definition (current_file, line, body);
24303 gdb_assert (macinfo_type == DW_MACRO_undef
24304 || macinfo_type == DW_MACRO_undef_strp
24305 || macinfo_type == DW_MACRO_undef_sup);
24306 macro_undef (current_file, line, body);
24311 case DW_MACRO_start_file:
24313 unsigned int bytes_read;
24316 line = read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
24317 mac_ptr += bytes_read;
24318 file = read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
24319 mac_ptr += bytes_read;
24321 if ((line == 0 && !at_commandline)
24322 || (line != 0 && at_commandline))
24323 complaint (&symfile_complaints,
24324 _("debug info gives source %d included "
24325 "from %s at %s line %d"),
24326 file, at_commandline ? _("command-line") : _("file"),
24327 line == 0 ? _("zero") : _("non-zero"), line);
24329 if (at_commandline)
24331 /* This DW_MACRO_start_file was executed in the
24333 at_commandline = 0;
24336 current_file = macro_start_file (file, line, current_file, lh);
24340 case DW_MACRO_end_file:
24341 if (! current_file)
24342 complaint (&symfile_complaints,
24343 _("macro debug info has an unmatched "
24344 "`close_file' directive"));
24347 current_file = current_file->included_by;
24348 if (! current_file)
24350 enum dwarf_macro_record_type next_type;
24352 /* GCC circa March 2002 doesn't produce the zero
24353 type byte marking the end of the compilation
24354 unit. Complain if it's not there, but exit no
24357 /* Do we at least have room for a macinfo type byte? */
24358 if (mac_ptr >= mac_end)
24360 dwarf2_section_buffer_overflow_complaint (section);
24364 /* We don't increment mac_ptr here, so this is just
24367 = (enum dwarf_macro_record_type) read_1_byte (abfd,
24369 if (next_type != 0)
24370 complaint (&symfile_complaints,
24371 _("no terminating 0-type entry for "
24372 "macros in `.debug_macinfo' section"));
24379 case DW_MACRO_import:
24380 case DW_MACRO_import_sup:
24384 bfd *include_bfd = abfd;
24385 struct dwarf2_section_info *include_section = section;
24386 const gdb_byte *include_mac_end = mac_end;
24387 int is_dwz = section_is_dwz;
24388 const gdb_byte *new_mac_ptr;
24390 offset = read_offset_1 (abfd, mac_ptr, offset_size);
24391 mac_ptr += offset_size;
24393 if (macinfo_type == DW_MACRO_import_sup)
24395 struct dwz_file *dwz = dwarf2_get_dwz_file (dwarf2_per_objfile);
24397 dwarf2_read_section (objfile, &dwz->macro);
24399 include_section = &dwz->macro;
24400 include_bfd = get_section_bfd_owner (include_section);
24401 include_mac_end = dwz->macro.buffer + dwz->macro.size;
24405 new_mac_ptr = include_section->buffer + offset;
24406 slot = htab_find_slot (include_hash, new_mac_ptr, INSERT);
24410 /* This has actually happened; see
24411 http://sourceware.org/bugzilla/show_bug.cgi?id=13568. */
24412 complaint (&symfile_complaints,
24413 _("recursive DW_MACRO_import in "
24414 ".debug_macro section"));
24418 *slot = (void *) new_mac_ptr;
24420 dwarf_decode_macro_bytes (dwarf2_per_objfile,
24421 include_bfd, new_mac_ptr,
24422 include_mac_end, current_file, lh,
24423 section, section_is_gnu, is_dwz,
24424 offset_size, include_hash);
24426 htab_remove_elt (include_hash, (void *) new_mac_ptr);
24431 case DW_MACINFO_vendor_ext:
24432 if (!section_is_gnu)
24434 unsigned int bytes_read;
24436 /* This reads the constant, but since we don't recognize
24437 any vendor extensions, we ignore it. */
24438 read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
24439 mac_ptr += bytes_read;
24440 read_direct_string (abfd, mac_ptr, &bytes_read);
24441 mac_ptr += bytes_read;
24443 /* We don't recognize any vendor extensions. */
24449 mac_ptr = skip_unknown_opcode (macinfo_type, opcode_definitions,
24450 mac_ptr, mac_end, abfd, offset_size,
24452 if (mac_ptr == NULL)
24457 } while (macinfo_type != 0);
24461 dwarf_decode_macros (struct dwarf2_cu *cu, unsigned int offset,
24462 int section_is_gnu)
24464 struct dwarf2_per_objfile *dwarf2_per_objfile
24465 = cu->per_cu->dwarf2_per_objfile;
24466 struct objfile *objfile = dwarf2_per_objfile->objfile;
24467 struct line_header *lh = cu->line_header;
24469 const gdb_byte *mac_ptr, *mac_end;
24470 struct macro_source_file *current_file = 0;
24471 enum dwarf_macro_record_type macinfo_type;
24472 unsigned int offset_size = cu->header.offset_size;
24473 const gdb_byte *opcode_definitions[256];
24475 struct dwarf2_section_info *section;
24476 const char *section_name;
24478 if (cu->dwo_unit != NULL)
24480 if (section_is_gnu)
24482 section = &cu->dwo_unit->dwo_file->sections.macro;
24483 section_name = ".debug_macro.dwo";
24487 section = &cu->dwo_unit->dwo_file->sections.macinfo;
24488 section_name = ".debug_macinfo.dwo";
24493 if (section_is_gnu)
24495 section = &dwarf2_per_objfile->macro;
24496 section_name = ".debug_macro";
24500 section = &dwarf2_per_objfile->macinfo;
24501 section_name = ".debug_macinfo";
24505 dwarf2_read_section (objfile, section);
24506 if (section->buffer == NULL)
24508 complaint (&symfile_complaints, _("missing %s section"), section_name);
24511 abfd = get_section_bfd_owner (section);
24513 /* First pass: Find the name of the base filename.
24514 This filename is needed in order to process all macros whose definition
24515 (or undefinition) comes from the command line. These macros are defined
24516 before the first DW_MACINFO_start_file entry, and yet still need to be
24517 associated to the base file.
24519 To determine the base file name, we scan the macro definitions until we
24520 reach the first DW_MACINFO_start_file entry. We then initialize
24521 CURRENT_FILE accordingly so that any macro definition found before the
24522 first DW_MACINFO_start_file can still be associated to the base file. */
24524 mac_ptr = section->buffer + offset;
24525 mac_end = section->buffer + section->size;
24527 mac_ptr = dwarf_parse_macro_header (opcode_definitions, abfd, mac_ptr,
24528 &offset_size, section_is_gnu);
24529 if (mac_ptr == NULL)
24531 /* We already issued a complaint. */
24537 /* Do we at least have room for a macinfo type byte? */
24538 if (mac_ptr >= mac_end)
24540 /* Complaint is printed during the second pass as GDB will probably
24541 stop the first pass earlier upon finding
24542 DW_MACINFO_start_file. */
24546 macinfo_type = (enum dwarf_macro_record_type) read_1_byte (abfd, mac_ptr);
24549 /* Note that we rely on the fact that the corresponding GNU and
24550 DWARF constants are the same. */
24552 DIAGNOSTIC_IGNORE_SWITCH_DIFFERENT_ENUM_TYPES
24553 switch (macinfo_type)
24555 /* A zero macinfo type indicates the end of the macro
24560 case DW_MACRO_define:
24561 case DW_MACRO_undef:
24562 /* Only skip the data by MAC_PTR. */
24564 unsigned int bytes_read;
24566 read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
24567 mac_ptr += bytes_read;
24568 read_direct_string (abfd, mac_ptr, &bytes_read);
24569 mac_ptr += bytes_read;
24573 case DW_MACRO_start_file:
24575 unsigned int bytes_read;
24578 line = read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
24579 mac_ptr += bytes_read;
24580 file = read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
24581 mac_ptr += bytes_read;
24583 current_file = macro_start_file (file, line, current_file, lh);
24587 case DW_MACRO_end_file:
24588 /* No data to skip by MAC_PTR. */
24591 case DW_MACRO_define_strp:
24592 case DW_MACRO_undef_strp:
24593 case DW_MACRO_define_sup:
24594 case DW_MACRO_undef_sup:
24596 unsigned int bytes_read;
24598 read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
24599 mac_ptr += bytes_read;
24600 mac_ptr += offset_size;
24604 case DW_MACRO_import:
24605 case DW_MACRO_import_sup:
24606 /* Note that, according to the spec, a transparent include
24607 chain cannot call DW_MACRO_start_file. So, we can just
24608 skip this opcode. */
24609 mac_ptr += offset_size;
24612 case DW_MACINFO_vendor_ext:
24613 /* Only skip the data by MAC_PTR. */
24614 if (!section_is_gnu)
24616 unsigned int bytes_read;
24618 read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
24619 mac_ptr += bytes_read;
24620 read_direct_string (abfd, mac_ptr, &bytes_read);
24621 mac_ptr += bytes_read;
24626 mac_ptr = skip_unknown_opcode (macinfo_type, opcode_definitions,
24627 mac_ptr, mac_end, abfd, offset_size,
24629 if (mac_ptr == NULL)
24634 } while (macinfo_type != 0 && current_file == NULL);
24636 /* Second pass: Process all entries.
24638 Use the AT_COMMAND_LINE flag to determine whether we are still processing
24639 command-line macro definitions/undefinitions. This flag is unset when we
24640 reach the first DW_MACINFO_start_file entry. */
24642 htab_up include_hash (htab_create_alloc (1, htab_hash_pointer,
24644 NULL, xcalloc, xfree));
24645 mac_ptr = section->buffer + offset;
24646 slot = htab_find_slot (include_hash.get (), mac_ptr, INSERT);
24647 *slot = (void *) mac_ptr;
24648 dwarf_decode_macro_bytes (dwarf2_per_objfile,
24649 abfd, mac_ptr, mac_end,
24650 current_file, lh, section,
24651 section_is_gnu, 0, offset_size,
24652 include_hash.get ());
24655 /* Check if the attribute's form is a DW_FORM_block*
24656 if so return true else false. */
24659 attr_form_is_block (const struct attribute *attr)
24661 return (attr == NULL ? 0 :
24662 attr->form == DW_FORM_block1
24663 || attr->form == DW_FORM_block2
24664 || attr->form == DW_FORM_block4
24665 || attr->form == DW_FORM_block
24666 || attr->form == DW_FORM_exprloc);
24669 /* Return non-zero if ATTR's value is a section offset --- classes
24670 lineptr, loclistptr, macptr or rangelistptr --- or zero, otherwise.
24671 You may use DW_UNSND (attr) to retrieve such offsets.
24673 Section 7.5.4, "Attribute Encodings", explains that no attribute
24674 may have a value that belongs to more than one of these classes; it
24675 would be ambiguous if we did, because we use the same forms for all
24679 attr_form_is_section_offset (const struct attribute *attr)
24681 return (attr->form == DW_FORM_data4
24682 || attr->form == DW_FORM_data8
24683 || attr->form == DW_FORM_sec_offset);
24686 /* Return non-zero if ATTR's value falls in the 'constant' class, or
24687 zero otherwise. When this function returns true, you can apply
24688 dwarf2_get_attr_constant_value to it.
24690 However, note that for some attributes you must check
24691 attr_form_is_section_offset before using this test. DW_FORM_data4
24692 and DW_FORM_data8 are members of both the constant class, and of
24693 the classes that contain offsets into other debug sections
24694 (lineptr, loclistptr, macptr or rangelistptr). The DWARF spec says
24695 that, if an attribute's can be either a constant or one of the
24696 section offset classes, DW_FORM_data4 and DW_FORM_data8 should be
24697 taken as section offsets, not constants.
24699 DW_FORM_data16 is not considered as dwarf2_get_attr_constant_value
24700 cannot handle that. */
24703 attr_form_is_constant (const struct attribute *attr)
24705 switch (attr->form)
24707 case DW_FORM_sdata:
24708 case DW_FORM_udata:
24709 case DW_FORM_data1:
24710 case DW_FORM_data2:
24711 case DW_FORM_data4:
24712 case DW_FORM_data8:
24713 case DW_FORM_implicit_const:
24721 /* DW_ADDR is always stored already as sect_offset; despite for the forms
24722 besides DW_FORM_ref_addr it is stored as cu_offset in the DWARF file. */
24725 attr_form_is_ref (const struct attribute *attr)
24727 switch (attr->form)
24729 case DW_FORM_ref_addr:
24734 case DW_FORM_ref_udata:
24735 case DW_FORM_GNU_ref_alt:
24742 /* Return the .debug_loc section to use for CU.
24743 For DWO files use .debug_loc.dwo. */
24745 static struct dwarf2_section_info *
24746 cu_debug_loc_section (struct dwarf2_cu *cu)
24748 struct dwarf2_per_objfile *dwarf2_per_objfile
24749 = cu->per_cu->dwarf2_per_objfile;
24753 struct dwo_sections *sections = &cu->dwo_unit->dwo_file->sections;
24755 return cu->header.version >= 5 ? §ions->loclists : §ions->loc;
24757 return (cu->header.version >= 5 ? &dwarf2_per_objfile->loclists
24758 : &dwarf2_per_objfile->loc);
24761 /* A helper function that fills in a dwarf2_loclist_baton. */
24764 fill_in_loclist_baton (struct dwarf2_cu *cu,
24765 struct dwarf2_loclist_baton *baton,
24766 const struct attribute *attr)
24768 struct dwarf2_per_objfile *dwarf2_per_objfile
24769 = cu->per_cu->dwarf2_per_objfile;
24770 struct dwarf2_section_info *section = cu_debug_loc_section (cu);
24772 dwarf2_read_section (dwarf2_per_objfile->objfile, section);
24774 baton->per_cu = cu->per_cu;
24775 gdb_assert (baton->per_cu);
24776 /* We don't know how long the location list is, but make sure we
24777 don't run off the edge of the section. */
24778 baton->size = section->size - DW_UNSND (attr);
24779 baton->data = section->buffer + DW_UNSND (attr);
24780 baton->base_address = cu->base_address;
24781 baton->from_dwo = cu->dwo_unit != NULL;
24785 dwarf2_symbol_mark_computed (const struct attribute *attr, struct symbol *sym,
24786 struct dwarf2_cu *cu, int is_block)
24788 struct dwarf2_per_objfile *dwarf2_per_objfile
24789 = cu->per_cu->dwarf2_per_objfile;
24790 struct objfile *objfile = dwarf2_per_objfile->objfile;
24791 struct dwarf2_section_info *section = cu_debug_loc_section (cu);
24793 if (attr_form_is_section_offset (attr)
24794 /* .debug_loc{,.dwo} may not exist at all, or the offset may be outside
24795 the section. If so, fall through to the complaint in the
24797 && DW_UNSND (attr) < dwarf2_section_size (objfile, section))
24799 struct dwarf2_loclist_baton *baton;
24801 baton = XOBNEW (&objfile->objfile_obstack, struct dwarf2_loclist_baton);
24803 fill_in_loclist_baton (cu, baton, attr);
24805 if (cu->base_known == 0)
24806 complaint (&symfile_complaints,
24807 _("Location list used without "
24808 "specifying the CU base address."));
24810 SYMBOL_ACLASS_INDEX (sym) = (is_block
24811 ? dwarf2_loclist_block_index
24812 : dwarf2_loclist_index);
24813 SYMBOL_LOCATION_BATON (sym) = baton;
24817 struct dwarf2_locexpr_baton *baton;
24819 baton = XOBNEW (&objfile->objfile_obstack, struct dwarf2_locexpr_baton);
24820 baton->per_cu = cu->per_cu;
24821 gdb_assert (baton->per_cu);
24823 if (attr_form_is_block (attr))
24825 /* Note that we're just copying the block's data pointer
24826 here, not the actual data. We're still pointing into the
24827 info_buffer for SYM's objfile; right now we never release
24828 that buffer, but when we do clean up properly this may
24830 baton->size = DW_BLOCK (attr)->size;
24831 baton->data = DW_BLOCK (attr)->data;
24835 dwarf2_invalid_attrib_class_complaint ("location description",
24836 SYMBOL_NATURAL_NAME (sym));
24840 SYMBOL_ACLASS_INDEX (sym) = (is_block
24841 ? dwarf2_locexpr_block_index
24842 : dwarf2_locexpr_index);
24843 SYMBOL_LOCATION_BATON (sym) = baton;
24847 /* Return the OBJFILE associated with the compilation unit CU. If CU
24848 came from a separate debuginfo file, then the master objfile is
24852 dwarf2_per_cu_objfile (struct dwarf2_per_cu_data *per_cu)
24854 struct objfile *objfile = per_cu->dwarf2_per_objfile->objfile;
24856 /* Return the master objfile, so that we can report and look up the
24857 correct file containing this variable. */
24858 if (objfile->separate_debug_objfile_backlink)
24859 objfile = objfile->separate_debug_objfile_backlink;
24864 /* Return comp_unit_head for PER_CU, either already available in PER_CU->CU
24865 (CU_HEADERP is unused in such case) or prepare a temporary copy at
24866 CU_HEADERP first. */
24868 static const struct comp_unit_head *
24869 per_cu_header_read_in (struct comp_unit_head *cu_headerp,
24870 struct dwarf2_per_cu_data *per_cu)
24872 const gdb_byte *info_ptr;
24875 return &per_cu->cu->header;
24877 info_ptr = per_cu->section->buffer + to_underlying (per_cu->sect_off);
24879 memset (cu_headerp, 0, sizeof (*cu_headerp));
24880 read_comp_unit_head (cu_headerp, info_ptr, per_cu->section,
24881 rcuh_kind::COMPILE);
24886 /* Return the address size given in the compilation unit header for CU. */
24889 dwarf2_per_cu_addr_size (struct dwarf2_per_cu_data *per_cu)
24891 struct comp_unit_head cu_header_local;
24892 const struct comp_unit_head *cu_headerp;
24894 cu_headerp = per_cu_header_read_in (&cu_header_local, per_cu);
24896 return cu_headerp->addr_size;
24899 /* Return the offset size given in the compilation unit header for CU. */
24902 dwarf2_per_cu_offset_size (struct dwarf2_per_cu_data *per_cu)
24904 struct comp_unit_head cu_header_local;
24905 const struct comp_unit_head *cu_headerp;
24907 cu_headerp = per_cu_header_read_in (&cu_header_local, per_cu);
24909 return cu_headerp->offset_size;
24912 /* See its dwarf2loc.h declaration. */
24915 dwarf2_per_cu_ref_addr_size (struct dwarf2_per_cu_data *per_cu)
24917 struct comp_unit_head cu_header_local;
24918 const struct comp_unit_head *cu_headerp;
24920 cu_headerp = per_cu_header_read_in (&cu_header_local, per_cu);
24922 if (cu_headerp->version == 2)
24923 return cu_headerp->addr_size;
24925 return cu_headerp->offset_size;
24928 /* Return the text offset of the CU. The returned offset comes from
24929 this CU's objfile. If this objfile came from a separate debuginfo
24930 file, then the offset may be different from the corresponding
24931 offset in the parent objfile. */
24934 dwarf2_per_cu_text_offset (struct dwarf2_per_cu_data *per_cu)
24936 struct objfile *objfile = per_cu->dwarf2_per_objfile->objfile;
24938 return ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
24941 /* Return DWARF version number of PER_CU. */
24944 dwarf2_version (struct dwarf2_per_cu_data *per_cu)
24946 return per_cu->dwarf_version;
24949 /* Locate the .debug_info compilation unit from CU's objfile which contains
24950 the DIE at OFFSET. Raises an error on failure. */
24952 static struct dwarf2_per_cu_data *
24953 dwarf2_find_containing_comp_unit (sect_offset sect_off,
24954 unsigned int offset_in_dwz,
24955 struct dwarf2_per_objfile *dwarf2_per_objfile)
24957 struct dwarf2_per_cu_data *this_cu;
24959 const sect_offset *cu_off;
24962 high = dwarf2_per_objfile->n_comp_units - 1;
24965 struct dwarf2_per_cu_data *mid_cu;
24966 int mid = low + (high - low) / 2;
24968 mid_cu = dwarf2_per_objfile->all_comp_units[mid];
24969 cu_off = &mid_cu->sect_off;
24970 if (mid_cu->is_dwz > offset_in_dwz
24971 || (mid_cu->is_dwz == offset_in_dwz && *cu_off >= sect_off))
24976 gdb_assert (low == high);
24977 this_cu = dwarf2_per_objfile->all_comp_units[low];
24978 cu_off = &this_cu->sect_off;
24979 if (this_cu->is_dwz != offset_in_dwz || *cu_off > sect_off)
24981 if (low == 0 || this_cu->is_dwz != offset_in_dwz)
24982 error (_("Dwarf Error: could not find partial DIE containing "
24983 "offset %s [in module %s]"),
24984 sect_offset_str (sect_off),
24985 bfd_get_filename (dwarf2_per_objfile->objfile->obfd));
24987 gdb_assert (dwarf2_per_objfile->all_comp_units[low-1]->sect_off
24989 return dwarf2_per_objfile->all_comp_units[low-1];
24993 this_cu = dwarf2_per_objfile->all_comp_units[low];
24994 if (low == dwarf2_per_objfile->n_comp_units - 1
24995 && sect_off >= this_cu->sect_off + this_cu->length)
24996 error (_("invalid dwarf2 offset %s"), sect_offset_str (sect_off));
24997 gdb_assert (sect_off < this_cu->sect_off + this_cu->length);
25002 /* Initialize dwarf2_cu CU, owned by PER_CU. */
25004 dwarf2_cu::dwarf2_cu (struct dwarf2_per_cu_data *per_cu_)
25005 : per_cu (per_cu_),
25008 checked_producer (0),
25009 producer_is_gxx_lt_4_6 (0),
25010 producer_is_gcc_lt_4_3 (0),
25011 producer_is_icc_lt_14 (0),
25012 processing_has_namespace_info (0)
25017 /* Destroy a dwarf2_cu. */
25019 dwarf2_cu::~dwarf2_cu ()
25024 /* Initialize basic fields of dwarf_cu CU according to DIE COMP_UNIT_DIE. */
25027 prepare_one_comp_unit (struct dwarf2_cu *cu, struct die_info *comp_unit_die,
25028 enum language pretend_language)
25030 struct attribute *attr;
25032 /* Set the language we're debugging. */
25033 attr = dwarf2_attr (comp_unit_die, DW_AT_language, cu);
25035 set_cu_language (DW_UNSND (attr), cu);
25038 cu->language = pretend_language;
25039 cu->language_defn = language_def (cu->language);
25042 cu->producer = dwarf2_string_attr (comp_unit_die, DW_AT_producer, cu);
25045 /* Increase the age counter on each cached compilation unit, and free
25046 any that are too old. */
25049 age_cached_comp_units (struct dwarf2_per_objfile *dwarf2_per_objfile)
25051 struct dwarf2_per_cu_data *per_cu, **last_chain;
25053 dwarf2_clear_marks (dwarf2_per_objfile->read_in_chain);
25054 per_cu = dwarf2_per_objfile->read_in_chain;
25055 while (per_cu != NULL)
25057 per_cu->cu->last_used ++;
25058 if (per_cu->cu->last_used <= dwarf_max_cache_age)
25059 dwarf2_mark (per_cu->cu);
25060 per_cu = per_cu->cu->read_in_chain;
25063 per_cu = dwarf2_per_objfile->read_in_chain;
25064 last_chain = &dwarf2_per_objfile->read_in_chain;
25065 while (per_cu != NULL)
25067 struct dwarf2_per_cu_data *next_cu;
25069 next_cu = per_cu->cu->read_in_chain;
25071 if (!per_cu->cu->mark)
25074 *last_chain = next_cu;
25077 last_chain = &per_cu->cu->read_in_chain;
25083 /* Remove a single compilation unit from the cache. */
25086 free_one_cached_comp_unit (struct dwarf2_per_cu_data *target_per_cu)
25088 struct dwarf2_per_cu_data *per_cu, **last_chain;
25089 struct dwarf2_per_objfile *dwarf2_per_objfile
25090 = target_per_cu->dwarf2_per_objfile;
25092 per_cu = dwarf2_per_objfile->read_in_chain;
25093 last_chain = &dwarf2_per_objfile->read_in_chain;
25094 while (per_cu != NULL)
25096 struct dwarf2_per_cu_data *next_cu;
25098 next_cu = per_cu->cu->read_in_chain;
25100 if (per_cu == target_per_cu)
25104 *last_chain = next_cu;
25108 last_chain = &per_cu->cu->read_in_chain;
25114 /* Release all extra memory associated with OBJFILE. */
25117 dwarf2_free_objfile (struct objfile *objfile)
25119 struct dwarf2_per_objfile *dwarf2_per_objfile
25120 = get_dwarf2_per_objfile (objfile);
25122 delete dwarf2_per_objfile;
25125 /* A set of CU "per_cu" pointer, DIE offset, and GDB type pointer.
25126 We store these in a hash table separate from the DIEs, and preserve them
25127 when the DIEs are flushed out of cache.
25129 The CU "per_cu" pointer is needed because offset alone is not enough to
25130 uniquely identify the type. A file may have multiple .debug_types sections,
25131 or the type may come from a DWO file. Furthermore, while it's more logical
25132 to use per_cu->section+offset, with Fission the section with the data is in
25133 the DWO file but we don't know that section at the point we need it.
25134 We have to use something in dwarf2_per_cu_data (or the pointer to it)
25135 because we can enter the lookup routine, get_die_type_at_offset, from
25136 outside this file, and thus won't necessarily have PER_CU->cu.
25137 Fortunately, PER_CU is stable for the life of the objfile. */
25139 struct dwarf2_per_cu_offset_and_type
25141 const struct dwarf2_per_cu_data *per_cu;
25142 sect_offset sect_off;
25146 /* Hash function for a dwarf2_per_cu_offset_and_type. */
25149 per_cu_offset_and_type_hash (const void *item)
25151 const struct dwarf2_per_cu_offset_and_type *ofs
25152 = (const struct dwarf2_per_cu_offset_and_type *) item;
25154 return (uintptr_t) ofs->per_cu + to_underlying (ofs->sect_off);
25157 /* Equality function for a dwarf2_per_cu_offset_and_type. */
25160 per_cu_offset_and_type_eq (const void *item_lhs, const void *item_rhs)
25162 const struct dwarf2_per_cu_offset_and_type *ofs_lhs
25163 = (const struct dwarf2_per_cu_offset_and_type *) item_lhs;
25164 const struct dwarf2_per_cu_offset_and_type *ofs_rhs
25165 = (const struct dwarf2_per_cu_offset_and_type *) item_rhs;
25167 return (ofs_lhs->per_cu == ofs_rhs->per_cu
25168 && ofs_lhs->sect_off == ofs_rhs->sect_off);
25171 /* Set the type associated with DIE to TYPE. Save it in CU's hash
25172 table if necessary. For convenience, return TYPE.
25174 The DIEs reading must have careful ordering to:
25175 * Not cause infite loops trying to read in DIEs as a prerequisite for
25176 reading current DIE.
25177 * Not trying to dereference contents of still incompletely read in types
25178 while reading in other DIEs.
25179 * Enable referencing still incompletely read in types just by a pointer to
25180 the type without accessing its fields.
25182 Therefore caller should follow these rules:
25183 * Try to fetch any prerequisite types we may need to build this DIE type
25184 before building the type and calling set_die_type.
25185 * After building type call set_die_type for current DIE as soon as
25186 possible before fetching more types to complete the current type.
25187 * Make the type as complete as possible before fetching more types. */
25189 static struct type *
25190 set_die_type (struct die_info *die, struct type *type, struct dwarf2_cu *cu)
25192 struct dwarf2_per_objfile *dwarf2_per_objfile
25193 = cu->per_cu->dwarf2_per_objfile;
25194 struct dwarf2_per_cu_offset_and_type **slot, ofs;
25195 struct objfile *objfile = dwarf2_per_objfile->objfile;
25196 struct attribute *attr;
25197 struct dynamic_prop prop;
25199 /* For Ada types, make sure that the gnat-specific data is always
25200 initialized (if not already set). There are a few types where
25201 we should not be doing so, because the type-specific area is
25202 already used to hold some other piece of info (eg: TYPE_CODE_FLT
25203 where the type-specific area is used to store the floatformat).
25204 But this is not a problem, because the gnat-specific information
25205 is actually not needed for these types. */
25206 if (need_gnat_info (cu)
25207 && TYPE_CODE (type) != TYPE_CODE_FUNC
25208 && TYPE_CODE (type) != TYPE_CODE_FLT
25209 && TYPE_CODE (type) != TYPE_CODE_METHODPTR
25210 && TYPE_CODE (type) != TYPE_CODE_MEMBERPTR
25211 && TYPE_CODE (type) != TYPE_CODE_METHOD
25212 && !HAVE_GNAT_AUX_INFO (type))
25213 INIT_GNAT_SPECIFIC (type);
25215 /* Read DW_AT_allocated and set in type. */
25216 attr = dwarf2_attr (die, DW_AT_allocated, cu);
25217 if (attr_form_is_block (attr))
25219 if (attr_to_dynamic_prop (attr, die, cu, &prop))
25220 add_dyn_prop (DYN_PROP_ALLOCATED, prop, type);
25222 else if (attr != NULL)
25224 complaint (&symfile_complaints,
25225 _("DW_AT_allocated has the wrong form (%s) at DIE %s"),
25226 (attr != NULL ? dwarf_form_name (attr->form) : "n/a"),
25227 sect_offset_str (die->sect_off));
25230 /* Read DW_AT_associated and set in type. */
25231 attr = dwarf2_attr (die, DW_AT_associated, cu);
25232 if (attr_form_is_block (attr))
25234 if (attr_to_dynamic_prop (attr, die, cu, &prop))
25235 add_dyn_prop (DYN_PROP_ASSOCIATED, prop, type);
25237 else if (attr != NULL)
25239 complaint (&symfile_complaints,
25240 _("DW_AT_associated has the wrong form (%s) at DIE %s"),
25241 (attr != NULL ? dwarf_form_name (attr->form) : "n/a"),
25242 sect_offset_str (die->sect_off));
25245 /* Read DW_AT_data_location and set in type. */
25246 attr = dwarf2_attr (die, DW_AT_data_location, cu);
25247 if (attr_to_dynamic_prop (attr, die, cu, &prop))
25248 add_dyn_prop (DYN_PROP_DATA_LOCATION, prop, type);
25250 if (dwarf2_per_objfile->die_type_hash == NULL)
25252 dwarf2_per_objfile->die_type_hash =
25253 htab_create_alloc_ex (127,
25254 per_cu_offset_and_type_hash,
25255 per_cu_offset_and_type_eq,
25257 &objfile->objfile_obstack,
25258 hashtab_obstack_allocate,
25259 dummy_obstack_deallocate);
25262 ofs.per_cu = cu->per_cu;
25263 ofs.sect_off = die->sect_off;
25265 slot = (struct dwarf2_per_cu_offset_and_type **)
25266 htab_find_slot (dwarf2_per_objfile->die_type_hash, &ofs, INSERT);
25268 complaint (&symfile_complaints,
25269 _("A problem internal to GDB: DIE %s has type already set"),
25270 sect_offset_str (die->sect_off));
25271 *slot = XOBNEW (&objfile->objfile_obstack,
25272 struct dwarf2_per_cu_offset_and_type);
25277 /* Look up the type for the die at SECT_OFF in PER_CU in die_type_hash,
25278 or return NULL if the die does not have a saved type. */
25280 static struct type *
25281 get_die_type_at_offset (sect_offset sect_off,
25282 struct dwarf2_per_cu_data *per_cu)
25284 struct dwarf2_per_cu_offset_and_type *slot, ofs;
25285 struct dwarf2_per_objfile *dwarf2_per_objfile = per_cu->dwarf2_per_objfile;
25287 if (dwarf2_per_objfile->die_type_hash == NULL)
25290 ofs.per_cu = per_cu;
25291 ofs.sect_off = sect_off;
25292 slot = ((struct dwarf2_per_cu_offset_and_type *)
25293 htab_find (dwarf2_per_objfile->die_type_hash, &ofs));
25300 /* Look up the type for DIE in CU in die_type_hash,
25301 or return NULL if DIE does not have a saved type. */
25303 static struct type *
25304 get_die_type (struct die_info *die, struct dwarf2_cu *cu)
25306 return get_die_type_at_offset (die->sect_off, cu->per_cu);
25309 /* Add a dependence relationship from CU to REF_PER_CU. */
25312 dwarf2_add_dependence (struct dwarf2_cu *cu,
25313 struct dwarf2_per_cu_data *ref_per_cu)
25317 if (cu->dependencies == NULL)
25319 = htab_create_alloc_ex (5, htab_hash_pointer, htab_eq_pointer,
25320 NULL, &cu->comp_unit_obstack,
25321 hashtab_obstack_allocate,
25322 dummy_obstack_deallocate);
25324 slot = htab_find_slot (cu->dependencies, ref_per_cu, INSERT);
25326 *slot = ref_per_cu;
25329 /* Subroutine of dwarf2_mark to pass to htab_traverse.
25330 Set the mark field in every compilation unit in the
25331 cache that we must keep because we are keeping CU. */
25334 dwarf2_mark_helper (void **slot, void *data)
25336 struct dwarf2_per_cu_data *per_cu;
25338 per_cu = (struct dwarf2_per_cu_data *) *slot;
25340 /* cu->dependencies references may not yet have been ever read if QUIT aborts
25341 reading of the chain. As such dependencies remain valid it is not much
25342 useful to track and undo them during QUIT cleanups. */
25343 if (per_cu->cu == NULL)
25346 if (per_cu->cu->mark)
25348 per_cu->cu->mark = 1;
25350 if (per_cu->cu->dependencies != NULL)
25351 htab_traverse (per_cu->cu->dependencies, dwarf2_mark_helper, NULL);
25356 /* Set the mark field in CU and in every other compilation unit in the
25357 cache that we must keep because we are keeping CU. */
25360 dwarf2_mark (struct dwarf2_cu *cu)
25365 if (cu->dependencies != NULL)
25366 htab_traverse (cu->dependencies, dwarf2_mark_helper, NULL);
25370 dwarf2_clear_marks (struct dwarf2_per_cu_data *per_cu)
25374 per_cu->cu->mark = 0;
25375 per_cu = per_cu->cu->read_in_chain;
25379 /* Trivial hash function for partial_die_info: the hash value of a DIE
25380 is its offset in .debug_info for this objfile. */
25383 partial_die_hash (const void *item)
25385 const struct partial_die_info *part_die
25386 = (const struct partial_die_info *) item;
25388 return to_underlying (part_die->sect_off);
25391 /* Trivial comparison function for partial_die_info structures: two DIEs
25392 are equal if they have the same offset. */
25395 partial_die_eq (const void *item_lhs, const void *item_rhs)
25397 const struct partial_die_info *part_die_lhs
25398 = (const struct partial_die_info *) item_lhs;
25399 const struct partial_die_info *part_die_rhs
25400 = (const struct partial_die_info *) item_rhs;
25402 return part_die_lhs->sect_off == part_die_rhs->sect_off;
25405 static struct cmd_list_element *set_dwarf_cmdlist;
25406 static struct cmd_list_element *show_dwarf_cmdlist;
25409 set_dwarf_cmd (const char *args, int from_tty)
25411 help_list (set_dwarf_cmdlist, "maintenance set dwarf ", all_commands,
25416 show_dwarf_cmd (const char *args, int from_tty)
25418 cmd_show_list (show_dwarf_cmdlist, from_tty, "");
25421 int dwarf_always_disassemble;
25424 show_dwarf_always_disassemble (struct ui_file *file, int from_tty,
25425 struct cmd_list_element *c, const char *value)
25427 fprintf_filtered (file,
25428 _("Whether to always disassemble "
25429 "DWARF expressions is %s.\n"),
25434 show_check_physname (struct ui_file *file, int from_tty,
25435 struct cmd_list_element *c, const char *value)
25437 fprintf_filtered (file,
25438 _("Whether to check \"physname\" is %s.\n"),
25443 _initialize_dwarf2_read (void)
25446 dwarf2_objfile_data_key = register_objfile_data ();
25448 add_prefix_cmd ("dwarf", class_maintenance, set_dwarf_cmd, _("\
25449 Set DWARF specific variables.\n\
25450 Configure DWARF variables such as the cache size"),
25451 &set_dwarf_cmdlist, "maintenance set dwarf ",
25452 0/*allow-unknown*/, &maintenance_set_cmdlist);
25454 add_prefix_cmd ("dwarf", class_maintenance, show_dwarf_cmd, _("\
25455 Show DWARF specific variables\n\
25456 Show DWARF variables such as the cache size"),
25457 &show_dwarf_cmdlist, "maintenance show dwarf ",
25458 0/*allow-unknown*/, &maintenance_show_cmdlist);
25460 add_setshow_zinteger_cmd ("max-cache-age", class_obscure,
25461 &dwarf_max_cache_age, _("\
25462 Set the upper bound on the age of cached DWARF compilation units."), _("\
25463 Show the upper bound on the age of cached DWARF compilation units."), _("\
25464 A higher limit means that cached compilation units will be stored\n\
25465 in memory longer, and more total memory will be used. Zero disables\n\
25466 caching, which can slow down startup."),
25468 show_dwarf_max_cache_age,
25469 &set_dwarf_cmdlist,
25470 &show_dwarf_cmdlist);
25472 add_setshow_boolean_cmd ("always-disassemble", class_obscure,
25473 &dwarf_always_disassemble, _("\
25474 Set whether `info address' always disassembles DWARF expressions."), _("\
25475 Show whether `info address' always disassembles DWARF expressions."), _("\
25476 When enabled, DWARF expressions are always printed in an assembly-like\n\
25477 syntax. When disabled, expressions will be printed in a more\n\
25478 conversational style, when possible."),
25480 show_dwarf_always_disassemble,
25481 &set_dwarf_cmdlist,
25482 &show_dwarf_cmdlist);
25484 add_setshow_zuinteger_cmd ("dwarf-read", no_class, &dwarf_read_debug, _("\
25485 Set debugging of the DWARF reader."), _("\
25486 Show debugging of the DWARF reader."), _("\
25487 When enabled (non-zero), debugging messages are printed during DWARF\n\
25488 reading and symtab expansion. A value of 1 (one) provides basic\n\
25489 information. A value greater than 1 provides more verbose information."),
25492 &setdebuglist, &showdebuglist);
25494 add_setshow_zuinteger_cmd ("dwarf-die", no_class, &dwarf_die_debug, _("\
25495 Set debugging of the DWARF DIE reader."), _("\
25496 Show debugging of the DWARF DIE reader."), _("\
25497 When enabled (non-zero), DIEs are dumped after they are read in.\n\
25498 The value is the maximum depth to print."),
25501 &setdebuglist, &showdebuglist);
25503 add_setshow_zuinteger_cmd ("dwarf-line", no_class, &dwarf_line_debug, _("\
25504 Set debugging of the dwarf line reader."), _("\
25505 Show debugging of the dwarf line reader."), _("\
25506 When enabled (non-zero), line number entries are dumped as they are read in.\n\
25507 A value of 1 (one) provides basic information.\n\
25508 A value greater than 1 provides more verbose information."),
25511 &setdebuglist, &showdebuglist);
25513 add_setshow_boolean_cmd ("check-physname", no_class, &check_physname, _("\
25514 Set cross-checking of \"physname\" code against demangler."), _("\
25515 Show cross-checking of \"physname\" code against demangler."), _("\
25516 When enabled, GDB's internal \"physname\" code is checked against\n\
25518 NULL, show_check_physname,
25519 &setdebuglist, &showdebuglist);
25521 add_setshow_boolean_cmd ("use-deprecated-index-sections",
25522 no_class, &use_deprecated_index_sections, _("\
25523 Set whether to use deprecated gdb_index sections."), _("\
25524 Show whether to use deprecated gdb_index sections."), _("\
25525 When enabled, deprecated .gdb_index sections are used anyway.\n\
25526 Normally they are ignored either because of a missing feature or\n\
25527 performance issue.\n\
25528 Warning: This option must be enabled before gdb reads the file."),
25531 &setlist, &showlist);
25533 dwarf2_locexpr_index = register_symbol_computed_impl (LOC_COMPUTED,
25534 &dwarf2_locexpr_funcs);
25535 dwarf2_loclist_index = register_symbol_computed_impl (LOC_COMPUTED,
25536 &dwarf2_loclist_funcs);
25538 dwarf2_locexpr_block_index = register_symbol_block_impl (LOC_BLOCK,
25539 &dwarf2_block_frame_base_locexpr_funcs);
25540 dwarf2_loclist_block_index = register_symbol_block_impl (LOC_BLOCK,
25541 &dwarf2_block_frame_base_loclist_funcs);
25544 selftests::register_test ("dw2_expand_symtabs_matching",
25545 selftests::dw2_expand_symtabs_matching::run_test);