1 /* DWARF 2 debugging format support for GDB.
3 Copyright (C) 1994-2019 Free Software Foundation, Inc.
5 Adapted by Gary Funck (gary@intrepid.com), Intrepid Technology,
6 Inc. with support from Florida State University (under contract
7 with the Ada Joint Program Office), and Silicon Graphics, Inc.
8 Initial contribution by Brent Benson, Harris Computer Systems, Inc.,
9 based on Fred Fish's (Cygnus Support) implementation of DWARF 1
12 This file is part of GDB.
14 This program is free software; you can redistribute it and/or modify
15 it under the terms of the GNU General Public License as published by
16 the Free Software Foundation; either version 3 of the License, or
17 (at your option) any later version.
19 This program is distributed in the hope that it will be useful,
20 but WITHOUT ANY WARRANTY; without even the implied warranty of
21 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
22 GNU General Public License for more details.
24 You should have received a copy of the GNU General Public License
25 along with this program. If not, see <http://www.gnu.org/licenses/>. */
27 /* FIXME: Various die-reading functions need to be more careful with
28 reading off the end of the section.
29 E.g., load_partial_dies, read_partial_die. */
32 #include "dwarf2read.h"
33 #include "dwarf-index-cache.h"
34 #include "dwarf-index-common.h"
43 #include "gdb-demangle.h"
44 #include "expression.h"
45 #include "filenames.h" /* for DOSish file names */
48 #include "complaints.h"
49 #include "dwarf2expr.h"
50 #include "dwarf2loc.h"
51 #include "cp-support.h"
57 #include "typeprint.h"
60 #include "completer.h"
61 #include "common/vec.h"
65 #include "gdbcore.h" /* for gnutarget */
66 #include "gdb/gdb-index.h"
71 #include "common/filestuff.h"
73 #include "namespace.h"
74 #include "common/gdb_unlinker.h"
75 #include "common/function-view.h"
76 #include "common/gdb_optional.h"
77 #include "common/underlying.h"
78 #include "common/byte-vector.h"
79 #include "common/hash_enum.h"
80 #include "filename-seen-cache.h"
83 #include <sys/types.h>
85 #include <unordered_set>
86 #include <unordered_map>
87 #include "common/selftest.h"
90 #include <forward_list>
91 #include "rust-lang.h"
92 #include "common/pathstuff.h"
94 /* When == 1, print basic high level tracing messages.
95 When > 1, be more verbose.
96 This is in contrast to the low level DIE reading of dwarf_die_debug. */
97 static unsigned int dwarf_read_debug = 0;
99 /* When non-zero, dump DIEs after they are read in. */
100 static unsigned int dwarf_die_debug = 0;
102 /* When non-zero, dump line number entries as they are read in. */
103 static unsigned int dwarf_line_debug = 0;
105 /* When non-zero, cross-check physname against demangler. */
106 static int check_physname = 0;
108 /* When non-zero, do not reject deprecated .gdb_index sections. */
109 static int use_deprecated_index_sections = 0;
111 static const struct objfile_key<dwarf2_per_objfile> dwarf2_objfile_data_key;
113 /* The "aclass" indices for various kinds of computed DWARF symbols. */
115 static int dwarf2_locexpr_index;
116 static int dwarf2_loclist_index;
117 static int dwarf2_locexpr_block_index;
118 static int dwarf2_loclist_block_index;
120 /* An index into a (C++) symbol name component in a symbol name as
121 recorded in the mapped_index's symbol table. For each C++ symbol
122 in the symbol table, we record one entry for the start of each
123 component in the symbol in a table of name components, and then
124 sort the table, in order to be able to binary search symbol names,
125 ignoring leading namespaces, both completion and regular look up.
126 For example, for symbol "A::B::C", we'll have an entry that points
127 to "A::B::C", another that points to "B::C", and another for "C".
128 Note that function symbols in GDB index have no parameter
129 information, just the function/method names. You can convert a
130 name_component to a "const char *" using the
131 'mapped_index::symbol_name_at(offset_type)' method. */
133 struct name_component
135 /* Offset in the symbol name where the component starts. Stored as
136 a (32-bit) offset instead of a pointer to save memory and improve
137 locality on 64-bit architectures. */
138 offset_type name_offset;
140 /* The symbol's index in the symbol and constant pool tables of a
145 /* Base class containing bits shared by both .gdb_index and
146 .debug_name indexes. */
148 struct mapped_index_base
150 mapped_index_base () = default;
151 DISABLE_COPY_AND_ASSIGN (mapped_index_base);
153 /* The name_component table (a sorted vector). See name_component's
154 description above. */
155 std::vector<name_component> name_components;
157 /* How NAME_COMPONENTS is sorted. */
158 enum case_sensitivity name_components_casing;
160 /* Return the number of names in the symbol table. */
161 virtual size_t symbol_name_count () const = 0;
163 /* Get the name of the symbol at IDX in the symbol table. */
164 virtual const char *symbol_name_at (offset_type idx) const = 0;
166 /* Return whether the name at IDX in the symbol table should be
168 virtual bool symbol_name_slot_invalid (offset_type idx) const
173 /* Build the symbol name component sorted vector, if we haven't
175 void build_name_components ();
177 /* Returns the lower (inclusive) and upper (exclusive) bounds of the
178 possible matches for LN_NO_PARAMS in the name component
180 std::pair<std::vector<name_component>::const_iterator,
181 std::vector<name_component>::const_iterator>
182 find_name_components_bounds (const lookup_name_info &ln_no_params) const;
184 /* Prevent deleting/destroying via a base class pointer. */
186 ~mapped_index_base() = default;
189 /* A description of the mapped index. The file format is described in
190 a comment by the code that writes the index. */
191 struct mapped_index final : public mapped_index_base
193 /* A slot/bucket in the symbol table hash. */
194 struct symbol_table_slot
196 const offset_type name;
197 const offset_type vec;
200 /* Index data format version. */
203 /* The address table data. */
204 gdb::array_view<const gdb_byte> address_table;
206 /* The symbol table, implemented as a hash table. */
207 gdb::array_view<symbol_table_slot> symbol_table;
209 /* A pointer to the constant pool. */
210 const char *constant_pool = nullptr;
212 bool symbol_name_slot_invalid (offset_type idx) const override
214 const auto &bucket = this->symbol_table[idx];
215 return bucket.name == 0 && bucket.vec;
218 /* Convenience method to get at the name of the symbol at IDX in the
220 const char *symbol_name_at (offset_type idx) const override
221 { return this->constant_pool + MAYBE_SWAP (this->symbol_table[idx].name); }
223 size_t symbol_name_count () const override
224 { return this->symbol_table.size (); }
227 /* A description of the mapped .debug_names.
228 Uninitialized map has CU_COUNT 0. */
229 struct mapped_debug_names final : public mapped_index_base
231 mapped_debug_names (struct dwarf2_per_objfile *dwarf2_per_objfile_)
232 : dwarf2_per_objfile (dwarf2_per_objfile_)
235 struct dwarf2_per_objfile *dwarf2_per_objfile;
236 bfd_endian dwarf5_byte_order;
237 bool dwarf5_is_dwarf64;
238 bool augmentation_is_gdb;
240 uint32_t cu_count = 0;
241 uint32_t tu_count, bucket_count, name_count;
242 const gdb_byte *cu_table_reordered, *tu_table_reordered;
243 const uint32_t *bucket_table_reordered, *hash_table_reordered;
244 const gdb_byte *name_table_string_offs_reordered;
245 const gdb_byte *name_table_entry_offs_reordered;
246 const gdb_byte *entry_pool;
253 /* Attribute name DW_IDX_*. */
256 /* Attribute form DW_FORM_*. */
259 /* Value if FORM is DW_FORM_implicit_const. */
260 LONGEST implicit_const;
262 std::vector<attr> attr_vec;
265 std::unordered_map<ULONGEST, index_val> abbrev_map;
267 const char *namei_to_name (uint32_t namei) const;
269 /* Implementation of the mapped_index_base virtual interface, for
270 the name_components cache. */
272 const char *symbol_name_at (offset_type idx) const override
273 { return namei_to_name (idx); }
275 size_t symbol_name_count () const override
276 { return this->name_count; }
279 /* See dwarf2read.h. */
282 get_dwarf2_per_objfile (struct objfile *objfile)
284 return dwarf2_objfile_data_key.get (objfile);
287 /* Default names of the debugging sections. */
289 /* Note that if the debugging section has been compressed, it might
290 have a name like .zdebug_info. */
292 static const struct dwarf2_debug_sections dwarf2_elf_names =
294 { ".debug_info", ".zdebug_info" },
295 { ".debug_abbrev", ".zdebug_abbrev" },
296 { ".debug_line", ".zdebug_line" },
297 { ".debug_loc", ".zdebug_loc" },
298 { ".debug_loclists", ".zdebug_loclists" },
299 { ".debug_macinfo", ".zdebug_macinfo" },
300 { ".debug_macro", ".zdebug_macro" },
301 { ".debug_str", ".zdebug_str" },
302 { ".debug_line_str", ".zdebug_line_str" },
303 { ".debug_ranges", ".zdebug_ranges" },
304 { ".debug_rnglists", ".zdebug_rnglists" },
305 { ".debug_types", ".zdebug_types" },
306 { ".debug_addr", ".zdebug_addr" },
307 { ".debug_frame", ".zdebug_frame" },
308 { ".eh_frame", NULL },
309 { ".gdb_index", ".zgdb_index" },
310 { ".debug_names", ".zdebug_names" },
311 { ".debug_aranges", ".zdebug_aranges" },
315 /* List of DWO/DWP sections. */
317 static const struct dwop_section_names
319 struct dwarf2_section_names abbrev_dwo;
320 struct dwarf2_section_names info_dwo;
321 struct dwarf2_section_names line_dwo;
322 struct dwarf2_section_names loc_dwo;
323 struct dwarf2_section_names loclists_dwo;
324 struct dwarf2_section_names macinfo_dwo;
325 struct dwarf2_section_names macro_dwo;
326 struct dwarf2_section_names str_dwo;
327 struct dwarf2_section_names str_offsets_dwo;
328 struct dwarf2_section_names types_dwo;
329 struct dwarf2_section_names cu_index;
330 struct dwarf2_section_names tu_index;
334 { ".debug_abbrev.dwo", ".zdebug_abbrev.dwo" },
335 { ".debug_info.dwo", ".zdebug_info.dwo" },
336 { ".debug_line.dwo", ".zdebug_line.dwo" },
337 { ".debug_loc.dwo", ".zdebug_loc.dwo" },
338 { ".debug_loclists.dwo", ".zdebug_loclists.dwo" },
339 { ".debug_macinfo.dwo", ".zdebug_macinfo.dwo" },
340 { ".debug_macro.dwo", ".zdebug_macro.dwo" },
341 { ".debug_str.dwo", ".zdebug_str.dwo" },
342 { ".debug_str_offsets.dwo", ".zdebug_str_offsets.dwo" },
343 { ".debug_types.dwo", ".zdebug_types.dwo" },
344 { ".debug_cu_index", ".zdebug_cu_index" },
345 { ".debug_tu_index", ".zdebug_tu_index" },
348 /* local data types */
350 /* The data in a compilation unit header, after target2host
351 translation, looks like this. */
352 struct comp_unit_head
356 unsigned char addr_size;
357 unsigned char signed_addr_p;
358 sect_offset abbrev_sect_off;
360 /* Size of file offsets; either 4 or 8. */
361 unsigned int offset_size;
363 /* Size of the length field; either 4 or 12. */
364 unsigned int initial_length_size;
366 enum dwarf_unit_type unit_type;
368 /* Offset to the first byte of this compilation unit header in the
369 .debug_info section, for resolving relative reference dies. */
370 sect_offset sect_off;
372 /* Offset to first die in this cu from the start of the cu.
373 This will be the first byte following the compilation unit header. */
374 cu_offset first_die_cu_offset;
376 /* 64-bit signature of this type unit - it is valid only for
377 UNIT_TYPE DW_UT_type. */
380 /* For types, offset in the type's DIE of the type defined by this TU. */
381 cu_offset type_cu_offset_in_tu;
384 /* Type used for delaying computation of method physnames.
385 See comments for compute_delayed_physnames. */
386 struct delayed_method_info
388 /* The type to which the method is attached, i.e., its parent class. */
391 /* The index of the method in the type's function fieldlists. */
394 /* The index of the method in the fieldlist. */
397 /* The name of the DIE. */
400 /* The DIE associated with this method. */
401 struct die_info *die;
404 /* Internal state when decoding a particular compilation unit. */
407 explicit dwarf2_cu (struct dwarf2_per_cu_data *per_cu);
410 DISABLE_COPY_AND_ASSIGN (dwarf2_cu);
412 /* TU version of handle_DW_AT_stmt_list for read_type_unit_scope.
413 Create the set of symtabs used by this TU, or if this TU is sharing
414 symtabs with another TU and the symtabs have already been created
415 then restore those symtabs in the line header.
416 We don't need the pc/line-number mapping for type units. */
417 void setup_type_unit_groups (struct die_info *die);
419 /* Start a symtab for DWARF. NAME, COMP_DIR, LOW_PC are passed to the
420 buildsym_compunit constructor. */
421 struct compunit_symtab *start_symtab (const char *name,
422 const char *comp_dir,
425 /* Reset the builder. */
426 void reset_builder () { m_builder.reset (); }
428 /* The header of the compilation unit. */
429 struct comp_unit_head header {};
431 /* Base address of this compilation unit. */
432 CORE_ADDR base_address = 0;
434 /* Non-zero if base_address has been set. */
437 /* The language we are debugging. */
438 enum language language = language_unknown;
439 const struct language_defn *language_defn = nullptr;
441 const char *producer = nullptr;
444 /* The symtab builder for this CU. This is only non-NULL when full
445 symbols are being read. */
446 std::unique_ptr<buildsym_compunit> m_builder;
449 /* The generic symbol table building routines have separate lists for
450 file scope symbols and all all other scopes (local scopes). So
451 we need to select the right one to pass to add_symbol_to_list().
452 We do it by keeping a pointer to the correct list in list_in_scope.
454 FIXME: The original dwarf code just treated the file scope as the
455 first local scope, and all other local scopes as nested local
456 scopes, and worked fine. Check to see if we really need to
457 distinguish these in buildsym.c. */
458 struct pending **list_in_scope = nullptr;
460 /* Hash table holding all the loaded partial DIEs
461 with partial_die->offset.SECT_OFF as hash. */
462 htab_t partial_dies = nullptr;
464 /* Storage for things with the same lifetime as this read-in compilation
465 unit, including partial DIEs. */
466 auto_obstack comp_unit_obstack;
468 /* When multiple dwarf2_cu structures are living in memory, this field
469 chains them all together, so that they can be released efficiently.
470 We will probably also want a generation counter so that most-recently-used
471 compilation units are cached... */
472 struct dwarf2_per_cu_data *read_in_chain = nullptr;
474 /* Backlink to our per_cu entry. */
475 struct dwarf2_per_cu_data *per_cu;
477 /* How many compilation units ago was this CU last referenced? */
480 /* A hash table of DIE cu_offset for following references with
481 die_info->offset.sect_off as hash. */
482 htab_t die_hash = nullptr;
484 /* Full DIEs if read in. */
485 struct die_info *dies = nullptr;
487 /* A set of pointers to dwarf2_per_cu_data objects for compilation
488 units referenced by this one. Only set during full symbol processing;
489 partial symbol tables do not have dependencies. */
490 htab_t dependencies = nullptr;
492 /* Header data from the line table, during full symbol processing. */
493 struct line_header *line_header = nullptr;
494 /* Non-NULL if LINE_HEADER is owned by this DWARF_CU. Otherwise,
495 it's owned by dwarf2_per_objfile::line_header_hash. If non-NULL,
496 this is the DW_TAG_compile_unit die for this CU. We'll hold on
497 to the line header as long as this DIE is being processed. See
498 process_die_scope. */
499 die_info *line_header_die_owner = nullptr;
501 /* A list of methods which need to have physnames computed
502 after all type information has been read. */
503 std::vector<delayed_method_info> method_list;
505 /* To be copied to symtab->call_site_htab. */
506 htab_t call_site_htab = nullptr;
508 /* Non-NULL if this CU came from a DWO file.
509 There is an invariant here that is important to remember:
510 Except for attributes copied from the top level DIE in the "main"
511 (or "stub") file in preparation for reading the DWO file
512 (e.g., DW_AT_GNU_addr_base), we KISS: there is only *one* CU.
513 Either there isn't a DWO file (in which case this is NULL and the point
514 is moot), or there is and either we're not going to read it (in which
515 case this is NULL) or there is and we are reading it (in which case this
517 struct dwo_unit *dwo_unit = nullptr;
519 /* The DW_AT_addr_base attribute if present, zero otherwise
520 (zero is a valid value though).
521 Note this value comes from the Fission stub CU/TU's DIE. */
522 ULONGEST addr_base = 0;
524 /* The DW_AT_ranges_base attribute if present, zero otherwise
525 (zero is a valid value though).
526 Note this value comes from the Fission stub CU/TU's DIE.
527 Also note that the value is zero in the non-DWO case so this value can
528 be used without needing to know whether DWO files are in use or not.
529 N.B. This does not apply to DW_AT_ranges appearing in
530 DW_TAG_compile_unit dies. This is a bit of a wart, consider if ever
531 DW_AT_ranges appeared in the DW_TAG_compile_unit of DWO DIEs: then
532 DW_AT_ranges_base *would* have to be applied, and we'd have to care
533 whether the DW_AT_ranges attribute came from the skeleton or DWO. */
534 ULONGEST ranges_base = 0;
536 /* When reading debug info generated by older versions of rustc, we
537 have to rewrite some union types to be struct types with a
538 variant part. This rewriting must be done after the CU is fully
539 read in, because otherwise at the point of rewriting some struct
540 type might not have been fully processed. So, we keep a list of
541 all such types here and process them after expansion. */
542 std::vector<struct type *> rust_unions;
544 /* Mark used when releasing cached dies. */
547 /* This CU references .debug_loc. See the symtab->locations_valid field.
548 This test is imperfect as there may exist optimized debug code not using
549 any location list and still facing inlining issues if handled as
550 unoptimized code. For a future better test see GCC PR other/32998. */
551 bool has_loclist : 1;
553 /* These cache the results for producer_is_* fields. CHECKED_PRODUCER is true
554 if all the producer_is_* fields are valid. This information is cached
555 because profiling CU expansion showed excessive time spent in
556 producer_is_gxx_lt_4_6. */
557 bool checked_producer : 1;
558 bool producer_is_gxx_lt_4_6 : 1;
559 bool producer_is_gcc_lt_4_3 : 1;
560 bool producer_is_icc : 1;
561 bool producer_is_icc_lt_14 : 1;
562 bool producer_is_codewarrior : 1;
564 /* When true, the file that we're processing is known to have
565 debugging info for C++ namespaces. GCC 3.3.x did not produce
566 this information, but later versions do. */
568 bool processing_has_namespace_info : 1;
570 struct partial_die_info *find_partial_die (sect_offset sect_off);
572 /* If this CU was inherited by another CU (via specification,
573 abstract_origin, etc), this is the ancestor CU. */
576 /* Get the buildsym_compunit for this CU. */
577 buildsym_compunit *get_builder ()
579 /* If this CU has a builder associated with it, use that. */
580 if (m_builder != nullptr)
581 return m_builder.get ();
583 /* Otherwise, search ancestors for a valid builder. */
584 if (ancestor != nullptr)
585 return ancestor->get_builder ();
591 /* A struct that can be used as a hash key for tables based on DW_AT_stmt_list.
592 This includes type_unit_group and quick_file_names. */
594 struct stmt_list_hash
596 /* The DWO unit this table is from or NULL if there is none. */
597 struct dwo_unit *dwo_unit;
599 /* Offset in .debug_line or .debug_line.dwo. */
600 sect_offset line_sect_off;
603 /* Each element of dwarf2_per_objfile->type_unit_groups is a pointer to
604 an object of this type. */
606 struct type_unit_group
608 /* dwarf2read.c's main "handle" on a TU symtab.
609 To simplify things we create an artificial CU that "includes" all the
610 type units using this stmt_list so that the rest of the code still has
611 a "per_cu" handle on the symtab.
612 This PER_CU is recognized by having no section. */
613 #define IS_TYPE_UNIT_GROUP(per_cu) ((per_cu)->section == NULL)
614 struct dwarf2_per_cu_data per_cu;
616 /* The TUs that share this DW_AT_stmt_list entry.
617 This is added to while parsing type units to build partial symtabs,
618 and is deleted afterwards and not used again. */
619 VEC (sig_type_ptr) *tus;
621 /* The compunit symtab.
622 Type units in a group needn't all be defined in the same source file,
623 so we create an essentially anonymous symtab as the compunit symtab. */
624 struct compunit_symtab *compunit_symtab;
626 /* The data used to construct the hash key. */
627 struct stmt_list_hash hash;
629 /* The number of symtabs from the line header.
630 The value here must match line_header.num_file_names. */
631 unsigned int num_symtabs;
633 /* The symbol tables for this TU (obtained from the files listed in
635 WARNING: The order of entries here must match the order of entries
636 in the line header. After the first TU using this type_unit_group, the
637 line header for the subsequent TUs is recreated from this. This is done
638 because we need to use the same symtabs for each TU using the same
639 DW_AT_stmt_list value. Also note that symtabs may be repeated here,
640 there's no guarantee the line header doesn't have duplicate entries. */
641 struct symtab **symtabs;
644 /* These sections are what may appear in a (real or virtual) DWO file. */
648 struct dwarf2_section_info abbrev;
649 struct dwarf2_section_info line;
650 struct dwarf2_section_info loc;
651 struct dwarf2_section_info loclists;
652 struct dwarf2_section_info macinfo;
653 struct dwarf2_section_info macro;
654 struct dwarf2_section_info str;
655 struct dwarf2_section_info str_offsets;
656 /* In the case of a virtual DWO file, these two are unused. */
657 struct dwarf2_section_info info;
658 VEC (dwarf2_section_info_def) *types;
661 /* CUs/TUs in DWP/DWO files. */
665 /* Backlink to the containing struct dwo_file. */
666 struct dwo_file *dwo_file;
668 /* The "id" that distinguishes this CU/TU.
669 .debug_info calls this "dwo_id", .debug_types calls this "signature".
670 Since signatures came first, we stick with it for consistency. */
673 /* The section this CU/TU lives in, in the DWO file. */
674 struct dwarf2_section_info *section;
676 /* Same as dwarf2_per_cu_data:{sect_off,length} but in the DWO section. */
677 sect_offset sect_off;
680 /* For types, offset in the type's DIE of the type defined by this TU. */
681 cu_offset type_offset_in_tu;
684 /* include/dwarf2.h defines the DWP section codes.
685 It defines a max value but it doesn't define a min value, which we
686 use for error checking, so provide one. */
688 enum dwp_v2_section_ids
693 /* Data for one DWO file.
695 This includes virtual DWO files (a virtual DWO file is a DWO file as it
696 appears in a DWP file). DWP files don't really have DWO files per se -
697 comdat folding of types "loses" the DWO file they came from, and from
698 a high level view DWP files appear to contain a mass of random types.
699 However, to maintain consistency with the non-DWP case we pretend DWP
700 files contain virtual DWO files, and we assign each TU with one virtual
701 DWO file (generally based on the line and abbrev section offsets -
702 a heuristic that seems to work in practice). */
706 /* The DW_AT_GNU_dwo_name attribute.
707 For virtual DWO files the name is constructed from the section offsets
708 of abbrev,line,loc,str_offsets so that we combine virtual DWO files
709 from related CU+TUs. */
710 const char *dwo_name;
712 /* The DW_AT_comp_dir attribute. */
713 const char *comp_dir;
715 /* The bfd, when the file is open. Otherwise this is NULL.
716 This is unused(NULL) for virtual DWO files where we use dwp_file.dbfd. */
719 /* The sections that make up this DWO file.
720 Remember that for virtual DWO files in DWP V2, these are virtual
721 sections (for lack of a better name). */
722 struct dwo_sections sections;
724 /* The CUs in the file.
725 Each element is a struct dwo_unit. Multiple CUs per DWO are supported as
726 an extension to handle LLVM's Link Time Optimization output (where
727 multiple source files may be compiled into a single object/dwo pair). */
730 /* Table of TUs in the file.
731 Each element is a struct dwo_unit. */
735 /* These sections are what may appear in a DWP file. */
739 /* These are used by both DWP version 1 and 2. */
740 struct dwarf2_section_info str;
741 struct dwarf2_section_info cu_index;
742 struct dwarf2_section_info tu_index;
744 /* These are only used by DWP version 2 files.
745 In DWP version 1 the .debug_info.dwo, .debug_types.dwo, and other
746 sections are referenced by section number, and are not recorded here.
747 In DWP version 2 there is at most one copy of all these sections, each
748 section being (effectively) comprised of the concatenation of all of the
749 individual sections that exist in the version 1 format.
750 To keep the code simple we treat each of these concatenated pieces as a
751 section itself (a virtual section?). */
752 struct dwarf2_section_info abbrev;
753 struct dwarf2_section_info info;
754 struct dwarf2_section_info line;
755 struct dwarf2_section_info loc;
756 struct dwarf2_section_info macinfo;
757 struct dwarf2_section_info macro;
758 struct dwarf2_section_info str_offsets;
759 struct dwarf2_section_info types;
762 /* These sections are what may appear in a virtual DWO file in DWP version 1.
763 A virtual DWO file is a DWO file as it appears in a DWP file. */
765 struct virtual_v1_dwo_sections
767 struct dwarf2_section_info abbrev;
768 struct dwarf2_section_info line;
769 struct dwarf2_section_info loc;
770 struct dwarf2_section_info macinfo;
771 struct dwarf2_section_info macro;
772 struct dwarf2_section_info str_offsets;
773 /* Each DWP hash table entry records one CU or one TU.
774 That is recorded here, and copied to dwo_unit.section. */
775 struct dwarf2_section_info info_or_types;
778 /* Similar to virtual_v1_dwo_sections, but for DWP version 2.
779 In version 2, the sections of the DWO files are concatenated together
780 and stored in one section of that name. Thus each ELF section contains
781 several "virtual" sections. */
783 struct virtual_v2_dwo_sections
785 bfd_size_type abbrev_offset;
786 bfd_size_type abbrev_size;
788 bfd_size_type line_offset;
789 bfd_size_type line_size;
791 bfd_size_type loc_offset;
792 bfd_size_type loc_size;
794 bfd_size_type macinfo_offset;
795 bfd_size_type macinfo_size;
797 bfd_size_type macro_offset;
798 bfd_size_type macro_size;
800 bfd_size_type str_offsets_offset;
801 bfd_size_type str_offsets_size;
803 /* Each DWP hash table entry records one CU or one TU.
804 That is recorded here, and copied to dwo_unit.section. */
805 bfd_size_type info_or_types_offset;
806 bfd_size_type info_or_types_size;
809 /* Contents of DWP hash tables. */
811 struct dwp_hash_table
813 uint32_t version, nr_columns;
814 uint32_t nr_units, nr_slots;
815 const gdb_byte *hash_table, *unit_table;
820 const gdb_byte *indices;
824 /* This is indexed by column number and gives the id of the section
826 #define MAX_NR_V2_DWO_SECTIONS \
827 (1 /* .debug_info or .debug_types */ \
828 + 1 /* .debug_abbrev */ \
829 + 1 /* .debug_line */ \
830 + 1 /* .debug_loc */ \
831 + 1 /* .debug_str_offsets */ \
832 + 1 /* .debug_macro or .debug_macinfo */)
833 int section_ids[MAX_NR_V2_DWO_SECTIONS];
834 const gdb_byte *offsets;
835 const gdb_byte *sizes;
840 /* Data for one DWP file. */
844 dwp_file (const char *name_, gdb_bfd_ref_ptr &&abfd)
846 dbfd (std::move (abfd))
850 /* Name of the file. */
853 /* File format version. */
857 gdb_bfd_ref_ptr dbfd;
859 /* Section info for this file. */
860 struct dwp_sections sections {};
862 /* Table of CUs in the file. */
863 const struct dwp_hash_table *cus = nullptr;
865 /* Table of TUs in the file. */
866 const struct dwp_hash_table *tus = nullptr;
868 /* Tables of loaded CUs/TUs. Each entry is a struct dwo_unit *. */
869 htab_t loaded_cus {};
870 htab_t loaded_tus {};
872 /* Table to map ELF section numbers to their sections.
873 This is only needed for the DWP V1 file format. */
874 unsigned int num_sections = 0;
875 asection **elf_sections = nullptr;
878 /* This represents a '.dwz' file. */
882 dwz_file (gdb_bfd_ref_ptr &&bfd)
883 : dwz_bfd (std::move (bfd))
887 /* A dwz file can only contain a few sections. */
888 struct dwarf2_section_info abbrev {};
889 struct dwarf2_section_info info {};
890 struct dwarf2_section_info str {};
891 struct dwarf2_section_info line {};
892 struct dwarf2_section_info macro {};
893 struct dwarf2_section_info gdb_index {};
894 struct dwarf2_section_info debug_names {};
897 gdb_bfd_ref_ptr dwz_bfd;
899 /* If we loaded the index from an external file, this contains the
900 resources associated to the open file, memory mapping, etc. */
901 std::unique_ptr<index_cache_resource> index_cache_res;
904 /* Struct used to pass misc. parameters to read_die_and_children, et
905 al. which are used for both .debug_info and .debug_types dies.
906 All parameters here are unchanging for the life of the call. This
907 struct exists to abstract away the constant parameters of die reading. */
909 struct die_reader_specs
911 /* The bfd of die_section. */
914 /* The CU of the DIE we are parsing. */
915 struct dwarf2_cu *cu;
917 /* Non-NULL if reading a DWO file (including one packaged into a DWP). */
918 struct dwo_file *dwo_file;
920 /* The section the die comes from.
921 This is either .debug_info or .debug_types, or the .dwo variants. */
922 struct dwarf2_section_info *die_section;
924 /* die_section->buffer. */
925 const gdb_byte *buffer;
927 /* The end of the buffer. */
928 const gdb_byte *buffer_end;
930 /* The value of the DW_AT_comp_dir attribute. */
931 const char *comp_dir;
933 /* The abbreviation table to use when reading the DIEs. */
934 struct abbrev_table *abbrev_table;
937 /* Type of function passed to init_cutu_and_read_dies, et.al. */
938 typedef void (die_reader_func_ftype) (const struct die_reader_specs *reader,
939 const gdb_byte *info_ptr,
940 struct die_info *comp_unit_die,
944 /* A 1-based directory index. This is a strong typedef to prevent
945 accidentally using a directory index as a 0-based index into an
947 enum class dir_index : unsigned int {};
949 /* Likewise, a 1-based file name index. */
950 enum class file_name_index : unsigned int {};
954 file_entry () = default;
956 file_entry (const char *name_, dir_index d_index_,
957 unsigned int mod_time_, unsigned int length_)
960 mod_time (mod_time_),
964 /* Return the include directory at D_INDEX stored in LH. Returns
965 NULL if D_INDEX is out of bounds. */
966 const char *include_dir (const line_header *lh) const;
968 /* The file name. Note this is an observing pointer. The memory is
969 owned by debug_line_buffer. */
972 /* The directory index (1-based). */
973 dir_index d_index {};
975 unsigned int mod_time {};
977 unsigned int length {};
979 /* True if referenced by the Line Number Program. */
982 /* The associated symbol table, if any. */
983 struct symtab *symtab {};
986 /* The line number information for a compilation unit (found in the
987 .debug_line section) begins with a "statement program header",
988 which contains the following information. */
995 /* Add an entry to the include directory table. */
996 void add_include_dir (const char *include_dir);
998 /* Add an entry to the file name table. */
999 void add_file_name (const char *name, dir_index d_index,
1000 unsigned int mod_time, unsigned int length);
1002 /* Return the include dir at INDEX (1-based). Returns NULL if INDEX
1003 is out of bounds. */
1004 const char *include_dir_at (dir_index index) const
1006 /* Convert directory index number (1-based) to vector index
1008 size_t vec_index = to_underlying (index) - 1;
1010 if (vec_index >= include_dirs.size ())
1012 return include_dirs[vec_index];
1015 /* Return the file name at INDEX (1-based). Returns NULL if INDEX
1016 is out of bounds. */
1017 file_entry *file_name_at (file_name_index index)
1019 /* Convert file name index number (1-based) to vector index
1021 size_t vec_index = to_underlying (index) - 1;
1023 if (vec_index >= file_names.size ())
1025 return &file_names[vec_index];
1028 /* Offset of line number information in .debug_line section. */
1029 sect_offset sect_off {};
1031 /* OFFSET is for struct dwz_file associated with dwarf2_per_objfile. */
1032 unsigned offset_in_dwz : 1; /* Can't initialize bitfields in-class. */
1034 unsigned int total_length {};
1035 unsigned short version {};
1036 unsigned int header_length {};
1037 unsigned char minimum_instruction_length {};
1038 unsigned char maximum_ops_per_instruction {};
1039 unsigned char default_is_stmt {};
1041 unsigned char line_range {};
1042 unsigned char opcode_base {};
1044 /* standard_opcode_lengths[i] is the number of operands for the
1045 standard opcode whose value is i. This means that
1046 standard_opcode_lengths[0] is unused, and the last meaningful
1047 element is standard_opcode_lengths[opcode_base - 1]. */
1048 std::unique_ptr<unsigned char[]> standard_opcode_lengths;
1050 /* The include_directories table. Note these are observing
1051 pointers. The memory is owned by debug_line_buffer. */
1052 std::vector<const char *> include_dirs;
1054 /* The file_names table. */
1055 std::vector<file_entry> file_names;
1057 /* The start and end of the statement program following this
1058 header. These point into dwarf2_per_objfile->line_buffer. */
1059 const gdb_byte *statement_program_start {}, *statement_program_end {};
1062 typedef std::unique_ptr<line_header> line_header_up;
1065 file_entry::include_dir (const line_header *lh) const
1067 return lh->include_dir_at (d_index);
1070 /* When we construct a partial symbol table entry we only
1071 need this much information. */
1072 struct partial_die_info : public allocate_on_obstack
1074 partial_die_info (sect_offset sect_off, struct abbrev_info *abbrev);
1076 /* Disable assign but still keep copy ctor, which is needed
1077 load_partial_dies. */
1078 partial_die_info& operator=(const partial_die_info& rhs) = delete;
1080 /* Adjust the partial die before generating a symbol for it. This
1081 function may set the is_external flag or change the DIE's
1083 void fixup (struct dwarf2_cu *cu);
1085 /* Read a minimal amount of information into the minimal die
1087 const gdb_byte *read (const struct die_reader_specs *reader,
1088 const struct abbrev_info &abbrev,
1089 const gdb_byte *info_ptr);
1091 /* Offset of this DIE. */
1092 const sect_offset sect_off;
1094 /* DWARF-2 tag for this DIE. */
1095 const ENUM_BITFIELD(dwarf_tag) tag : 16;
1097 /* Assorted flags describing the data found in this DIE. */
1098 const unsigned int has_children : 1;
1100 unsigned int is_external : 1;
1101 unsigned int is_declaration : 1;
1102 unsigned int has_type : 1;
1103 unsigned int has_specification : 1;
1104 unsigned int has_pc_info : 1;
1105 unsigned int may_be_inlined : 1;
1107 /* This DIE has been marked DW_AT_main_subprogram. */
1108 unsigned int main_subprogram : 1;
1110 /* Flag set if the SCOPE field of this structure has been
1112 unsigned int scope_set : 1;
1114 /* Flag set if the DIE has a byte_size attribute. */
1115 unsigned int has_byte_size : 1;
1117 /* Flag set if the DIE has a DW_AT_const_value attribute. */
1118 unsigned int has_const_value : 1;
1120 /* Flag set if any of the DIE's children are template arguments. */
1121 unsigned int has_template_arguments : 1;
1123 /* Flag set if fixup has been called on this die. */
1124 unsigned int fixup_called : 1;
1126 /* Flag set if DW_TAG_imported_unit uses DW_FORM_GNU_ref_alt. */
1127 unsigned int is_dwz : 1;
1129 /* Flag set if spec_offset uses DW_FORM_GNU_ref_alt. */
1130 unsigned int spec_is_dwz : 1;
1132 /* The name of this DIE. Normally the value of DW_AT_name, but
1133 sometimes a default name for unnamed DIEs. */
1134 const char *name = nullptr;
1136 /* The linkage name, if present. */
1137 const char *linkage_name = nullptr;
1139 /* The scope to prepend to our children. This is generally
1140 allocated on the comp_unit_obstack, so will disappear
1141 when this compilation unit leaves the cache. */
1142 const char *scope = nullptr;
1144 /* Some data associated with the partial DIE. The tag determines
1145 which field is live. */
1148 /* The location description associated with this DIE, if any. */
1149 struct dwarf_block *locdesc;
1150 /* The offset of an import, for DW_TAG_imported_unit. */
1151 sect_offset sect_off;
1154 /* If HAS_PC_INFO, the PC range associated with this DIE. */
1155 CORE_ADDR lowpc = 0;
1156 CORE_ADDR highpc = 0;
1158 /* Pointer into the info_buffer (or types_buffer) pointing at the target of
1159 DW_AT_sibling, if any. */
1160 /* NOTE: This member isn't strictly necessary, partial_die_info::read
1161 could return DW_AT_sibling values to its caller load_partial_dies. */
1162 const gdb_byte *sibling = nullptr;
1164 /* If HAS_SPECIFICATION, the offset of the DIE referred to by
1165 DW_AT_specification (or DW_AT_abstract_origin or
1166 DW_AT_extension). */
1167 sect_offset spec_offset {};
1169 /* Pointers to this DIE's parent, first child, and next sibling,
1171 struct partial_die_info *die_parent = nullptr;
1172 struct partial_die_info *die_child = nullptr;
1173 struct partial_die_info *die_sibling = nullptr;
1175 friend struct partial_die_info *
1176 dwarf2_cu::find_partial_die (sect_offset sect_off);
1179 /* Only need to do look up in dwarf2_cu::find_partial_die. */
1180 partial_die_info (sect_offset sect_off)
1181 : partial_die_info (sect_off, DW_TAG_padding, 0)
1185 partial_die_info (sect_offset sect_off_, enum dwarf_tag tag_,
1187 : sect_off (sect_off_), tag (tag_), has_children (has_children_)
1192 has_specification = 0;
1195 main_subprogram = 0;
1198 has_const_value = 0;
1199 has_template_arguments = 0;
1206 /* This data structure holds the information of an abbrev. */
1209 unsigned int number; /* number identifying abbrev */
1210 enum dwarf_tag tag; /* dwarf tag */
1211 unsigned short has_children; /* boolean */
1212 unsigned short num_attrs; /* number of attributes */
1213 struct attr_abbrev *attrs; /* an array of attribute descriptions */
1214 struct abbrev_info *next; /* next in chain */
1219 ENUM_BITFIELD(dwarf_attribute) name : 16;
1220 ENUM_BITFIELD(dwarf_form) form : 16;
1222 /* It is valid only if FORM is DW_FORM_implicit_const. */
1223 LONGEST implicit_const;
1226 /* Size of abbrev_table.abbrev_hash_table. */
1227 #define ABBREV_HASH_SIZE 121
1229 /* Top level data structure to contain an abbreviation table. */
1233 explicit abbrev_table (sect_offset off)
1237 XOBNEWVEC (&abbrev_obstack, struct abbrev_info *, ABBREV_HASH_SIZE);
1238 memset (m_abbrevs, 0, ABBREV_HASH_SIZE * sizeof (struct abbrev_info *));
1241 DISABLE_COPY_AND_ASSIGN (abbrev_table);
1243 /* Allocate space for a struct abbrev_info object in
1245 struct abbrev_info *alloc_abbrev ();
1247 /* Add an abbreviation to the table. */
1248 void add_abbrev (unsigned int abbrev_number, struct abbrev_info *abbrev);
1250 /* Look up an abbrev in the table.
1251 Returns NULL if the abbrev is not found. */
1253 struct abbrev_info *lookup_abbrev (unsigned int abbrev_number);
1256 /* Where the abbrev table came from.
1257 This is used as a sanity check when the table is used. */
1258 const sect_offset sect_off;
1260 /* Storage for the abbrev table. */
1261 auto_obstack abbrev_obstack;
1265 /* Hash table of abbrevs.
1266 This is an array of size ABBREV_HASH_SIZE allocated in abbrev_obstack.
1267 It could be statically allocated, but the previous code didn't so we
1269 struct abbrev_info **m_abbrevs;
1272 typedef std::unique_ptr<struct abbrev_table> abbrev_table_up;
1274 /* Attributes have a name and a value. */
1277 ENUM_BITFIELD(dwarf_attribute) name : 16;
1278 ENUM_BITFIELD(dwarf_form) form : 15;
1280 /* Has DW_STRING already been updated by dwarf2_canonicalize_name? This
1281 field should be in u.str (existing only for DW_STRING) but it is kept
1282 here for better struct attribute alignment. */
1283 unsigned int string_is_canonical : 1;
1288 struct dwarf_block *blk;
1297 /* This data structure holds a complete die structure. */
1300 /* DWARF-2 tag for this DIE. */
1301 ENUM_BITFIELD(dwarf_tag) tag : 16;
1303 /* Number of attributes */
1304 unsigned char num_attrs;
1306 /* True if we're presently building the full type name for the
1307 type derived from this DIE. */
1308 unsigned char building_fullname : 1;
1310 /* True if this die is in process. PR 16581. */
1311 unsigned char in_process : 1;
1314 unsigned int abbrev;
1316 /* Offset in .debug_info or .debug_types section. */
1317 sect_offset sect_off;
1319 /* The dies in a compilation unit form an n-ary tree. PARENT
1320 points to this die's parent; CHILD points to the first child of
1321 this node; and all the children of a given node are chained
1322 together via their SIBLING fields. */
1323 struct die_info *child; /* Its first child, if any. */
1324 struct die_info *sibling; /* Its next sibling, if any. */
1325 struct die_info *parent; /* Its parent, if any. */
1327 /* An array of attributes, with NUM_ATTRS elements. There may be
1328 zero, but it's not common and zero-sized arrays are not
1329 sufficiently portable C. */
1330 struct attribute attrs[1];
1333 /* Get at parts of an attribute structure. */
1335 #define DW_STRING(attr) ((attr)->u.str)
1336 #define DW_STRING_IS_CANONICAL(attr) ((attr)->string_is_canonical)
1337 #define DW_UNSND(attr) ((attr)->u.unsnd)
1338 #define DW_BLOCK(attr) ((attr)->u.blk)
1339 #define DW_SND(attr) ((attr)->u.snd)
1340 #define DW_ADDR(attr) ((attr)->u.addr)
1341 #define DW_SIGNATURE(attr) ((attr)->u.signature)
1343 /* Blocks are a bunch of untyped bytes. */
1348 /* Valid only if SIZE is not zero. */
1349 const gdb_byte *data;
1352 #ifndef ATTR_ALLOC_CHUNK
1353 #define ATTR_ALLOC_CHUNK 4
1356 /* Allocate fields for structs, unions and enums in this size. */
1357 #ifndef DW_FIELD_ALLOC_CHUNK
1358 #define DW_FIELD_ALLOC_CHUNK 4
1361 /* FIXME: We might want to set this from BFD via bfd_arch_bits_per_byte,
1362 but this would require a corresponding change in unpack_field_as_long
1364 static int bits_per_byte = 8;
1366 /* When reading a variant or variant part, we track a bit more
1367 information about the field, and store it in an object of this
1370 struct variant_field
1372 /* If we see a DW_TAG_variant, then this will be the discriminant
1374 ULONGEST discriminant_value;
1375 /* If we see a DW_TAG_variant, then this will be set if this is the
1377 bool default_branch;
1378 /* While reading a DW_TAG_variant_part, this will be set if this
1379 field is the discriminant. */
1380 bool is_discriminant;
1385 int accessibility = 0;
1387 /* Extra information to describe a variant or variant part. */
1388 struct variant_field variant {};
1389 struct field field {};
1394 const char *name = nullptr;
1395 std::vector<struct fn_field> fnfields;
1398 /* The routines that read and process dies for a C struct or C++ class
1399 pass lists of data member fields and lists of member function fields
1400 in an instance of a field_info structure, as defined below. */
1403 /* List of data member and baseclasses fields. */
1404 std::vector<struct nextfield> fields;
1405 std::vector<struct nextfield> baseclasses;
1407 /* Number of fields (including baseclasses). */
1410 /* Set if the accesibility of one of the fields is not public. */
1411 int non_public_fields = 0;
1413 /* Member function fieldlist array, contains name of possibly overloaded
1414 member function, number of overloaded member functions and a pointer
1415 to the head of the member function field chain. */
1416 std::vector<struct fnfieldlist> fnfieldlists;
1418 /* typedefs defined inside this class. TYPEDEF_FIELD_LIST contains head of
1419 a NULL terminated list of TYPEDEF_FIELD_LIST_COUNT elements. */
1420 std::vector<struct decl_field> typedef_field_list;
1422 /* Nested types defined by this class and the number of elements in this
1424 std::vector<struct decl_field> nested_types_list;
1427 /* One item on the queue of compilation units to read in full symbols
1429 struct dwarf2_queue_item
1431 struct dwarf2_per_cu_data *per_cu;
1432 enum language pretend_language;
1433 struct dwarf2_queue_item *next;
1436 /* The current queue. */
1437 static struct dwarf2_queue_item *dwarf2_queue, *dwarf2_queue_tail;
1439 /* Loaded secondary compilation units are kept in memory until they
1440 have not been referenced for the processing of this many
1441 compilation units. Set this to zero to disable caching. Cache
1442 sizes of up to at least twenty will improve startup time for
1443 typical inter-CU-reference binaries, at an obvious memory cost. */
1444 static int dwarf_max_cache_age = 5;
1446 show_dwarf_max_cache_age (struct ui_file *file, int from_tty,
1447 struct cmd_list_element *c, const char *value)
1449 fprintf_filtered (file, _("The upper bound on the age of cached "
1450 "DWARF compilation units is %s.\n"),
1454 /* local function prototypes */
1456 static const char *get_section_name (const struct dwarf2_section_info *);
1458 static const char *get_section_file_name (const struct dwarf2_section_info *);
1460 static void dwarf2_find_base_address (struct die_info *die,
1461 struct dwarf2_cu *cu);
1463 static struct partial_symtab *create_partial_symtab
1464 (struct dwarf2_per_cu_data *per_cu, const char *name);
1466 static void build_type_psymtabs_reader (const struct die_reader_specs *reader,
1467 const gdb_byte *info_ptr,
1468 struct die_info *type_unit_die,
1469 int has_children, void *data);
1471 static void dwarf2_build_psymtabs_hard
1472 (struct dwarf2_per_objfile *dwarf2_per_objfile);
1474 static void scan_partial_symbols (struct partial_die_info *,
1475 CORE_ADDR *, CORE_ADDR *,
1476 int, struct dwarf2_cu *);
1478 static void add_partial_symbol (struct partial_die_info *,
1479 struct dwarf2_cu *);
1481 static void add_partial_namespace (struct partial_die_info *pdi,
1482 CORE_ADDR *lowpc, CORE_ADDR *highpc,
1483 int set_addrmap, struct dwarf2_cu *cu);
1485 static void add_partial_module (struct partial_die_info *pdi, CORE_ADDR *lowpc,
1486 CORE_ADDR *highpc, int set_addrmap,
1487 struct dwarf2_cu *cu);
1489 static void add_partial_enumeration (struct partial_die_info *enum_pdi,
1490 struct dwarf2_cu *cu);
1492 static void add_partial_subprogram (struct partial_die_info *pdi,
1493 CORE_ADDR *lowpc, CORE_ADDR *highpc,
1494 int need_pc, struct dwarf2_cu *cu);
1496 static void dwarf2_read_symtab (struct partial_symtab *,
1499 static void psymtab_to_symtab_1 (struct partial_symtab *);
1501 static abbrev_table_up abbrev_table_read_table
1502 (struct dwarf2_per_objfile *dwarf2_per_objfile, struct dwarf2_section_info *,
1505 static unsigned int peek_abbrev_code (bfd *, const gdb_byte *);
1507 static struct partial_die_info *load_partial_dies
1508 (const struct die_reader_specs *, const gdb_byte *, int);
1510 /* A pair of partial_die_info and compilation unit. */
1511 struct cu_partial_die_info
1513 /* The compilation unit of the partial_die_info. */
1514 struct dwarf2_cu *cu;
1515 /* A partial_die_info. */
1516 struct partial_die_info *pdi;
1518 cu_partial_die_info (struct dwarf2_cu *cu, struct partial_die_info *pdi)
1524 cu_partial_die_info () = delete;
1527 static const struct cu_partial_die_info find_partial_die (sect_offset, int,
1528 struct dwarf2_cu *);
1530 static const gdb_byte *read_attribute (const struct die_reader_specs *,
1531 struct attribute *, struct attr_abbrev *,
1534 static unsigned int read_1_byte (bfd *, const gdb_byte *);
1536 static int read_1_signed_byte (bfd *, const gdb_byte *);
1538 static unsigned int read_2_bytes (bfd *, const gdb_byte *);
1540 /* Read the next three bytes (little-endian order) as an unsigned integer. */
1541 static unsigned int read_3_bytes (bfd *, const gdb_byte *);
1543 static unsigned int read_4_bytes (bfd *, const gdb_byte *);
1545 static ULONGEST read_8_bytes (bfd *, const gdb_byte *);
1547 static CORE_ADDR read_address (bfd *, const gdb_byte *ptr, struct dwarf2_cu *,
1550 static LONGEST read_initial_length (bfd *, const gdb_byte *, unsigned int *);
1552 static LONGEST read_checked_initial_length_and_offset
1553 (bfd *, const gdb_byte *, const struct comp_unit_head *,
1554 unsigned int *, unsigned int *);
1556 static LONGEST read_offset (bfd *, const gdb_byte *,
1557 const struct comp_unit_head *,
1560 static LONGEST read_offset_1 (bfd *, const gdb_byte *, unsigned int);
1562 static sect_offset read_abbrev_offset
1563 (struct dwarf2_per_objfile *dwarf2_per_objfile,
1564 struct dwarf2_section_info *, sect_offset);
1566 static const gdb_byte *read_n_bytes (bfd *, const gdb_byte *, unsigned int);
1568 static const char *read_direct_string (bfd *, const gdb_byte *, unsigned int *);
1570 static const char *read_indirect_string
1571 (struct dwarf2_per_objfile *dwarf2_per_objfile, bfd *, const gdb_byte *,
1572 const struct comp_unit_head *, unsigned int *);
1574 static const char *read_indirect_line_string
1575 (struct dwarf2_per_objfile *dwarf2_per_objfile, bfd *, const gdb_byte *,
1576 const struct comp_unit_head *, unsigned int *);
1578 static const char *read_indirect_string_at_offset
1579 (struct dwarf2_per_objfile *dwarf2_per_objfile, bfd *abfd,
1580 LONGEST str_offset);
1582 static const char *read_indirect_string_from_dwz
1583 (struct objfile *objfile, struct dwz_file *, LONGEST);
1585 static LONGEST read_signed_leb128 (bfd *, const gdb_byte *, unsigned int *);
1587 static CORE_ADDR read_addr_index_from_leb128 (struct dwarf2_cu *,
1591 static const char *read_str_index (const struct die_reader_specs *reader,
1592 ULONGEST str_index);
1594 static void set_cu_language (unsigned int, struct dwarf2_cu *);
1596 static struct attribute *dwarf2_attr (struct die_info *, unsigned int,
1597 struct dwarf2_cu *);
1599 static struct attribute *dwarf2_attr_no_follow (struct die_info *,
1602 static const char *dwarf2_string_attr (struct die_info *die, unsigned int name,
1603 struct dwarf2_cu *cu);
1605 static int dwarf2_flag_true_p (struct die_info *die, unsigned name,
1606 struct dwarf2_cu *cu);
1608 static int die_is_declaration (struct die_info *, struct dwarf2_cu *cu);
1610 static struct die_info *die_specification (struct die_info *die,
1611 struct dwarf2_cu **);
1613 static line_header_up dwarf_decode_line_header (sect_offset sect_off,
1614 struct dwarf2_cu *cu);
1616 static void dwarf_decode_lines (struct line_header *, const char *,
1617 struct dwarf2_cu *, struct partial_symtab *,
1618 CORE_ADDR, int decode_mapping);
1620 static void dwarf2_start_subfile (struct dwarf2_cu *, const char *,
1623 static struct symbol *new_symbol (struct die_info *, struct type *,
1624 struct dwarf2_cu *, struct symbol * = NULL);
1626 static void dwarf2_const_value (const struct attribute *, struct symbol *,
1627 struct dwarf2_cu *);
1629 static void dwarf2_const_value_attr (const struct attribute *attr,
1632 struct obstack *obstack,
1633 struct dwarf2_cu *cu, LONGEST *value,
1634 const gdb_byte **bytes,
1635 struct dwarf2_locexpr_baton **baton);
1637 static struct type *die_type (struct die_info *, struct dwarf2_cu *);
1639 static int need_gnat_info (struct dwarf2_cu *);
1641 static struct type *die_descriptive_type (struct die_info *,
1642 struct dwarf2_cu *);
1644 static void set_descriptive_type (struct type *, struct die_info *,
1645 struct dwarf2_cu *);
1647 static struct type *die_containing_type (struct die_info *,
1648 struct dwarf2_cu *);
1650 static struct type *lookup_die_type (struct die_info *, const struct attribute *,
1651 struct dwarf2_cu *);
1653 static struct type *read_type_die (struct die_info *, struct dwarf2_cu *);
1655 static struct type *read_type_die_1 (struct die_info *, struct dwarf2_cu *);
1657 static const char *determine_prefix (struct die_info *die, struct dwarf2_cu *);
1659 static char *typename_concat (struct obstack *obs, const char *prefix,
1660 const char *suffix, int physname,
1661 struct dwarf2_cu *cu);
1663 static void read_file_scope (struct die_info *, struct dwarf2_cu *);
1665 static void read_type_unit_scope (struct die_info *, struct dwarf2_cu *);
1667 static void read_func_scope (struct die_info *, struct dwarf2_cu *);
1669 static void read_lexical_block_scope (struct die_info *, struct dwarf2_cu *);
1671 static void read_call_site_scope (struct die_info *die, struct dwarf2_cu *cu);
1673 static void read_variable (struct die_info *die, struct dwarf2_cu *cu);
1675 static int dwarf2_ranges_read (unsigned, CORE_ADDR *, CORE_ADDR *,
1676 struct dwarf2_cu *, struct partial_symtab *);
1678 /* How dwarf2_get_pc_bounds constructed its *LOWPC and *HIGHPC return
1679 values. Keep the items ordered with increasing constraints compliance. */
1682 /* No attribute DW_AT_low_pc, DW_AT_high_pc or DW_AT_ranges was found. */
1683 PC_BOUNDS_NOT_PRESENT,
1685 /* Some of the attributes DW_AT_low_pc, DW_AT_high_pc or DW_AT_ranges
1686 were present but they do not form a valid range of PC addresses. */
1689 /* Discontiguous range was found - that is DW_AT_ranges was found. */
1692 /* Contiguous range was found - DW_AT_low_pc and DW_AT_high_pc were found. */
1696 static enum pc_bounds_kind dwarf2_get_pc_bounds (struct die_info *,
1697 CORE_ADDR *, CORE_ADDR *,
1699 struct partial_symtab *);
1701 static void get_scope_pc_bounds (struct die_info *,
1702 CORE_ADDR *, CORE_ADDR *,
1703 struct dwarf2_cu *);
1705 static void dwarf2_record_block_ranges (struct die_info *, struct block *,
1706 CORE_ADDR, struct dwarf2_cu *);
1708 static void dwarf2_add_field (struct field_info *, struct die_info *,
1709 struct dwarf2_cu *);
1711 static void dwarf2_attach_fields_to_type (struct field_info *,
1712 struct type *, struct dwarf2_cu *);
1714 static void dwarf2_add_member_fn (struct field_info *,
1715 struct die_info *, struct type *,
1716 struct dwarf2_cu *);
1718 static void dwarf2_attach_fn_fields_to_type (struct field_info *,
1720 struct dwarf2_cu *);
1722 static void process_structure_scope (struct die_info *, struct dwarf2_cu *);
1724 static void read_common_block (struct die_info *, struct dwarf2_cu *);
1726 static void read_namespace (struct die_info *die, struct dwarf2_cu *);
1728 static void read_module (struct die_info *die, struct dwarf2_cu *cu);
1730 static struct using_direct **using_directives (struct dwarf2_cu *cu);
1732 static void read_import_statement (struct die_info *die, struct dwarf2_cu *);
1734 static int read_namespace_alias (struct die_info *die, struct dwarf2_cu *cu);
1736 static struct type *read_module_type (struct die_info *die,
1737 struct dwarf2_cu *cu);
1739 static const char *namespace_name (struct die_info *die,
1740 int *is_anonymous, struct dwarf2_cu *);
1742 static void process_enumeration_scope (struct die_info *, struct dwarf2_cu *);
1744 static CORE_ADDR decode_locdesc (struct dwarf_block *, struct dwarf2_cu *);
1746 static enum dwarf_array_dim_ordering read_array_order (struct die_info *,
1747 struct dwarf2_cu *);
1749 static struct die_info *read_die_and_siblings_1
1750 (const struct die_reader_specs *, const gdb_byte *, const gdb_byte **,
1753 static struct die_info *read_die_and_siblings (const struct die_reader_specs *,
1754 const gdb_byte *info_ptr,
1755 const gdb_byte **new_info_ptr,
1756 struct die_info *parent);
1758 static const gdb_byte *read_full_die_1 (const struct die_reader_specs *,
1759 struct die_info **, const gdb_byte *,
1762 static const gdb_byte *read_full_die (const struct die_reader_specs *,
1763 struct die_info **, const gdb_byte *,
1766 static void process_die (struct die_info *, struct dwarf2_cu *);
1768 static const char *dwarf2_canonicalize_name (const char *, struct dwarf2_cu *,
1771 static const char *dwarf2_name (struct die_info *die, struct dwarf2_cu *);
1773 static const char *dwarf2_full_name (const char *name,
1774 struct die_info *die,
1775 struct dwarf2_cu *cu);
1777 static const char *dwarf2_physname (const char *name, struct die_info *die,
1778 struct dwarf2_cu *cu);
1780 static struct die_info *dwarf2_extension (struct die_info *die,
1781 struct dwarf2_cu **);
1783 static const char *dwarf_tag_name (unsigned int);
1785 static const char *dwarf_attr_name (unsigned int);
1787 static const char *dwarf_form_name (unsigned int);
1789 static const char *dwarf_bool_name (unsigned int);
1791 static const char *dwarf_type_encoding_name (unsigned int);
1793 static struct die_info *sibling_die (struct die_info *);
1795 static void dump_die_shallow (struct ui_file *, int indent, struct die_info *);
1797 static void dump_die_for_error (struct die_info *);
1799 static void dump_die_1 (struct ui_file *, int level, int max_level,
1802 /*static*/ void dump_die (struct die_info *, int max_level);
1804 static void store_in_ref_table (struct die_info *,
1805 struct dwarf2_cu *);
1807 static sect_offset dwarf2_get_ref_die_offset (const struct attribute *);
1809 static LONGEST dwarf2_get_attr_constant_value (const struct attribute *, int);
1811 static struct die_info *follow_die_ref_or_sig (struct die_info *,
1812 const struct attribute *,
1813 struct dwarf2_cu **);
1815 static struct die_info *follow_die_ref (struct die_info *,
1816 const struct attribute *,
1817 struct dwarf2_cu **);
1819 static struct die_info *follow_die_sig (struct die_info *,
1820 const struct attribute *,
1821 struct dwarf2_cu **);
1823 static struct type *get_signatured_type (struct die_info *, ULONGEST,
1824 struct dwarf2_cu *);
1826 static struct type *get_DW_AT_signature_type (struct die_info *,
1827 const struct attribute *,
1828 struct dwarf2_cu *);
1830 static void load_full_type_unit (struct dwarf2_per_cu_data *per_cu);
1832 static void read_signatured_type (struct signatured_type *);
1834 static int attr_to_dynamic_prop (const struct attribute *attr,
1835 struct die_info *die, struct dwarf2_cu *cu,
1836 struct dynamic_prop *prop);
1838 /* memory allocation interface */
1840 static struct dwarf_block *dwarf_alloc_block (struct dwarf2_cu *);
1842 static struct die_info *dwarf_alloc_die (struct dwarf2_cu *, int);
1844 static void dwarf_decode_macros (struct dwarf2_cu *, unsigned int, int);
1846 static int attr_form_is_block (const struct attribute *);
1848 static int attr_form_is_section_offset (const struct attribute *);
1850 static int attr_form_is_constant (const struct attribute *);
1852 static int attr_form_is_ref (const struct attribute *);
1854 static void fill_in_loclist_baton (struct dwarf2_cu *cu,
1855 struct dwarf2_loclist_baton *baton,
1856 const struct attribute *attr);
1858 static void dwarf2_symbol_mark_computed (const struct attribute *attr,
1860 struct dwarf2_cu *cu,
1863 static const gdb_byte *skip_one_die (const struct die_reader_specs *reader,
1864 const gdb_byte *info_ptr,
1865 struct abbrev_info *abbrev);
1867 static hashval_t partial_die_hash (const void *item);
1869 static int partial_die_eq (const void *item_lhs, const void *item_rhs);
1871 static struct dwarf2_per_cu_data *dwarf2_find_containing_comp_unit
1872 (sect_offset sect_off, unsigned int offset_in_dwz,
1873 struct dwarf2_per_objfile *dwarf2_per_objfile);
1875 static void prepare_one_comp_unit (struct dwarf2_cu *cu,
1876 struct die_info *comp_unit_die,
1877 enum language pretend_language);
1879 static void age_cached_comp_units (struct dwarf2_per_objfile *dwarf2_per_objfile);
1881 static void free_one_cached_comp_unit (struct dwarf2_per_cu_data *);
1883 static struct type *set_die_type (struct die_info *, struct type *,
1884 struct dwarf2_cu *);
1886 static void create_all_comp_units (struct dwarf2_per_objfile *dwarf2_per_objfile);
1888 static int create_all_type_units (struct dwarf2_per_objfile *dwarf2_per_objfile);
1890 static void load_full_comp_unit (struct dwarf2_per_cu_data *, bool,
1893 static void process_full_comp_unit (struct dwarf2_per_cu_data *,
1896 static void process_full_type_unit (struct dwarf2_per_cu_data *,
1899 static void dwarf2_add_dependence (struct dwarf2_cu *,
1900 struct dwarf2_per_cu_data *);
1902 static void dwarf2_mark (struct dwarf2_cu *);
1904 static void dwarf2_clear_marks (struct dwarf2_per_cu_data *);
1906 static struct type *get_die_type_at_offset (sect_offset,
1907 struct dwarf2_per_cu_data *);
1909 static struct type *get_die_type (struct die_info *die, struct dwarf2_cu *cu);
1911 static void queue_comp_unit (struct dwarf2_per_cu_data *per_cu,
1912 enum language pretend_language);
1914 static void process_queue (struct dwarf2_per_objfile *dwarf2_per_objfile);
1916 /* Class, the destructor of which frees all allocated queue entries. This
1917 will only have work to do if an error was thrown while processing the
1918 dwarf. If no error was thrown then the queue entries should have all
1919 been processed, and freed, as we went along. */
1921 class dwarf2_queue_guard
1924 dwarf2_queue_guard () = default;
1926 /* Free any entries remaining on the queue. There should only be
1927 entries left if we hit an error while processing the dwarf. */
1928 ~dwarf2_queue_guard ()
1930 struct dwarf2_queue_item *item, *last;
1932 item = dwarf2_queue;
1935 /* Anything still marked queued is likely to be in an
1936 inconsistent state, so discard it. */
1937 if (item->per_cu->queued)
1939 if (item->per_cu->cu != NULL)
1940 free_one_cached_comp_unit (item->per_cu);
1941 item->per_cu->queued = 0;
1949 dwarf2_queue = dwarf2_queue_tail = NULL;
1953 /* The return type of find_file_and_directory. Note, the enclosed
1954 string pointers are only valid while this object is valid. */
1956 struct file_and_directory
1958 /* The filename. This is never NULL. */
1961 /* The compilation directory. NULL if not known. If we needed to
1962 compute a new string, this points to COMP_DIR_STORAGE, otherwise,
1963 points directly to the DW_AT_comp_dir string attribute owned by
1964 the obstack that owns the DIE. */
1965 const char *comp_dir;
1967 /* If we needed to build a new string for comp_dir, this is what
1968 owns the storage. */
1969 std::string comp_dir_storage;
1972 static file_and_directory find_file_and_directory (struct die_info *die,
1973 struct dwarf2_cu *cu);
1975 static char *file_full_name (int file, struct line_header *lh,
1976 const char *comp_dir);
1978 /* Expected enum dwarf_unit_type for read_comp_unit_head. */
1979 enum class rcuh_kind { COMPILE, TYPE };
1981 static const gdb_byte *read_and_check_comp_unit_head
1982 (struct dwarf2_per_objfile* dwarf2_per_objfile,
1983 struct comp_unit_head *header,
1984 struct dwarf2_section_info *section,
1985 struct dwarf2_section_info *abbrev_section, const gdb_byte *info_ptr,
1986 rcuh_kind section_kind);
1988 static void init_cutu_and_read_dies
1989 (struct dwarf2_per_cu_data *this_cu, struct abbrev_table *abbrev_table,
1990 int use_existing_cu, int keep, bool skip_partial,
1991 die_reader_func_ftype *die_reader_func, void *data);
1993 static void init_cutu_and_read_dies_simple
1994 (struct dwarf2_per_cu_data *this_cu,
1995 die_reader_func_ftype *die_reader_func, void *data);
1997 static htab_t allocate_signatured_type_table (struct objfile *objfile);
1999 static htab_t allocate_dwo_unit_table (struct objfile *objfile);
2001 static struct dwo_unit *lookup_dwo_unit_in_dwp
2002 (struct dwarf2_per_objfile *dwarf2_per_objfile,
2003 struct dwp_file *dwp_file, const char *comp_dir,
2004 ULONGEST signature, int is_debug_types);
2006 static struct dwp_file *get_dwp_file
2007 (struct dwarf2_per_objfile *dwarf2_per_objfile);
2009 static struct dwo_unit *lookup_dwo_comp_unit
2010 (struct dwarf2_per_cu_data *, const char *, const char *, ULONGEST);
2012 static struct dwo_unit *lookup_dwo_type_unit
2013 (struct signatured_type *, const char *, const char *);
2015 static void queue_and_load_all_dwo_tus (struct dwarf2_per_cu_data *);
2017 static void free_dwo_file (struct dwo_file *);
2019 /* A unique_ptr helper to free a dwo_file. */
2021 struct dwo_file_deleter
2023 void operator() (struct dwo_file *df) const
2029 /* A unique pointer to a dwo_file. */
2031 typedef std::unique_ptr<struct dwo_file, dwo_file_deleter> dwo_file_up;
2033 static void process_cu_includes (struct dwarf2_per_objfile *dwarf2_per_objfile);
2035 static void check_producer (struct dwarf2_cu *cu);
2037 static void free_line_header_voidp (void *arg);
2039 /* Various complaints about symbol reading that don't abort the process. */
2042 dwarf2_statement_list_fits_in_line_number_section_complaint (void)
2044 complaint (_("statement list doesn't fit in .debug_line section"));
2048 dwarf2_debug_line_missing_file_complaint (void)
2050 complaint (_(".debug_line section has line data without a file"));
2054 dwarf2_debug_line_missing_end_sequence_complaint (void)
2056 complaint (_(".debug_line section has line "
2057 "program sequence without an end"));
2061 dwarf2_complex_location_expr_complaint (void)
2063 complaint (_("location expression too complex"));
2067 dwarf2_const_value_length_mismatch_complaint (const char *arg1, int arg2,
2070 complaint (_("const value length mismatch for '%s', got %d, expected %d"),
2075 dwarf2_section_buffer_overflow_complaint (struct dwarf2_section_info *section)
2077 complaint (_("debug info runs off end of %s section"
2079 get_section_name (section),
2080 get_section_file_name (section));
2084 dwarf2_macro_malformed_definition_complaint (const char *arg1)
2086 complaint (_("macro debug info contains a "
2087 "malformed macro definition:\n`%s'"),
2092 dwarf2_invalid_attrib_class_complaint (const char *arg1, const char *arg2)
2094 complaint (_("invalid attribute class or form for '%s' in '%s'"),
2098 /* Hash function for line_header_hash. */
2101 line_header_hash (const struct line_header *ofs)
2103 return to_underlying (ofs->sect_off) ^ ofs->offset_in_dwz;
2106 /* Hash function for htab_create_alloc_ex for line_header_hash. */
2109 line_header_hash_voidp (const void *item)
2111 const struct line_header *ofs = (const struct line_header *) item;
2113 return line_header_hash (ofs);
2116 /* Equality function for line_header_hash. */
2119 line_header_eq_voidp (const void *item_lhs, const void *item_rhs)
2121 const struct line_header *ofs_lhs = (const struct line_header *) item_lhs;
2122 const struct line_header *ofs_rhs = (const struct line_header *) item_rhs;
2124 return (ofs_lhs->sect_off == ofs_rhs->sect_off
2125 && ofs_lhs->offset_in_dwz == ofs_rhs->offset_in_dwz);
2130 /* Read the given attribute value as an address, taking the attribute's
2131 form into account. */
2134 attr_value_as_address (struct attribute *attr)
2138 if (attr->form != DW_FORM_addr && attr->form != DW_FORM_addrx
2139 && attr->form != DW_FORM_GNU_addr_index)
2141 /* Aside from a few clearly defined exceptions, attributes that
2142 contain an address must always be in DW_FORM_addr form.
2143 Unfortunately, some compilers happen to be violating this
2144 requirement by encoding addresses using other forms, such
2145 as DW_FORM_data4 for example. For those broken compilers,
2146 we try to do our best, without any guarantee of success,
2147 to interpret the address correctly. It would also be nice
2148 to generate a complaint, but that would require us to maintain
2149 a list of legitimate cases where a non-address form is allowed,
2150 as well as update callers to pass in at least the CU's DWARF
2151 version. This is more overhead than what we're willing to
2152 expand for a pretty rare case. */
2153 addr = DW_UNSND (attr);
2156 addr = DW_ADDR (attr);
2161 /* See declaration. */
2163 dwarf2_per_objfile::dwarf2_per_objfile (struct objfile *objfile_,
2164 const dwarf2_debug_sections *names)
2165 : objfile (objfile_)
2168 names = &dwarf2_elf_names;
2170 bfd *obfd = objfile->obfd;
2172 for (asection *sec = obfd->sections; sec != NULL; sec = sec->next)
2173 locate_sections (obfd, sec, *names);
2176 static void free_dwo_files (htab_t dwo_files, struct objfile *objfile);
2178 dwarf2_per_objfile::~dwarf2_per_objfile ()
2180 /* Cached DIE trees use xmalloc and the comp_unit_obstack. */
2181 free_cached_comp_units ();
2183 if (quick_file_names_table)
2184 htab_delete (quick_file_names_table);
2186 if (line_header_hash)
2187 htab_delete (line_header_hash);
2189 for (dwarf2_per_cu_data *per_cu : all_comp_units)
2190 VEC_free (dwarf2_per_cu_ptr, per_cu->imported_symtabs);
2192 for (signatured_type *sig_type : all_type_units)
2193 VEC_free (dwarf2_per_cu_ptr, sig_type->per_cu.imported_symtabs);
2195 VEC_free (dwarf2_section_info_def, types);
2197 if (dwo_files != NULL)
2198 free_dwo_files (dwo_files, objfile);
2200 /* Everything else should be on the objfile obstack. */
2203 /* See declaration. */
2206 dwarf2_per_objfile::free_cached_comp_units ()
2208 dwarf2_per_cu_data *per_cu = read_in_chain;
2209 dwarf2_per_cu_data **last_chain = &read_in_chain;
2210 while (per_cu != NULL)
2212 dwarf2_per_cu_data *next_cu = per_cu->cu->read_in_chain;
2215 *last_chain = next_cu;
2220 /* A helper class that calls free_cached_comp_units on
2223 class free_cached_comp_units
2227 explicit free_cached_comp_units (dwarf2_per_objfile *per_objfile)
2228 : m_per_objfile (per_objfile)
2232 ~free_cached_comp_units ()
2234 m_per_objfile->free_cached_comp_units ();
2237 DISABLE_COPY_AND_ASSIGN (free_cached_comp_units);
2241 dwarf2_per_objfile *m_per_objfile;
2244 /* Try to locate the sections we need for DWARF 2 debugging
2245 information and return true if we have enough to do something.
2246 NAMES points to the dwarf2 section names, or is NULL if the standard
2247 ELF names are used. */
2250 dwarf2_has_info (struct objfile *objfile,
2251 const struct dwarf2_debug_sections *names)
2253 if (objfile->flags & OBJF_READNEVER)
2256 struct dwarf2_per_objfile *dwarf2_per_objfile
2257 = get_dwarf2_per_objfile (objfile);
2259 if (dwarf2_per_objfile == NULL)
2260 dwarf2_per_objfile = dwarf2_objfile_data_key.emplace (objfile, objfile,
2263 return (!dwarf2_per_objfile->info.is_virtual
2264 && dwarf2_per_objfile->info.s.section != NULL
2265 && !dwarf2_per_objfile->abbrev.is_virtual
2266 && dwarf2_per_objfile->abbrev.s.section != NULL);
2269 /* Return the containing section of virtual section SECTION. */
2271 static struct dwarf2_section_info *
2272 get_containing_section (const struct dwarf2_section_info *section)
2274 gdb_assert (section->is_virtual);
2275 return section->s.containing_section;
2278 /* Return the bfd owner of SECTION. */
2281 get_section_bfd_owner (const struct dwarf2_section_info *section)
2283 if (section->is_virtual)
2285 section = get_containing_section (section);
2286 gdb_assert (!section->is_virtual);
2288 return section->s.section->owner;
2291 /* Return the bfd section of SECTION.
2292 Returns NULL if the section is not present. */
2295 get_section_bfd_section (const struct dwarf2_section_info *section)
2297 if (section->is_virtual)
2299 section = get_containing_section (section);
2300 gdb_assert (!section->is_virtual);
2302 return section->s.section;
2305 /* Return the name of SECTION. */
2308 get_section_name (const struct dwarf2_section_info *section)
2310 asection *sectp = get_section_bfd_section (section);
2312 gdb_assert (sectp != NULL);
2313 return bfd_section_name (get_section_bfd_owner (section), sectp);
2316 /* Return the name of the file SECTION is in. */
2319 get_section_file_name (const struct dwarf2_section_info *section)
2321 bfd *abfd = get_section_bfd_owner (section);
2323 return bfd_get_filename (abfd);
2326 /* Return the id of SECTION.
2327 Returns 0 if SECTION doesn't exist. */
2330 get_section_id (const struct dwarf2_section_info *section)
2332 asection *sectp = get_section_bfd_section (section);
2339 /* Return the flags of SECTION.
2340 SECTION (or containing section if this is a virtual section) must exist. */
2343 get_section_flags (const struct dwarf2_section_info *section)
2345 asection *sectp = get_section_bfd_section (section);
2347 gdb_assert (sectp != NULL);
2348 return bfd_get_section_flags (sectp->owner, sectp);
2351 /* When loading sections, we look either for uncompressed section or for
2352 compressed section names. */
2355 section_is_p (const char *section_name,
2356 const struct dwarf2_section_names *names)
2358 if (names->normal != NULL
2359 && strcmp (section_name, names->normal) == 0)
2361 if (names->compressed != NULL
2362 && strcmp (section_name, names->compressed) == 0)
2367 /* See declaration. */
2370 dwarf2_per_objfile::locate_sections (bfd *abfd, asection *sectp,
2371 const dwarf2_debug_sections &names)
2373 flagword aflag = bfd_get_section_flags (abfd, sectp);
2375 if ((aflag & SEC_HAS_CONTENTS) == 0)
2378 else if (section_is_p (sectp->name, &names.info))
2380 this->info.s.section = sectp;
2381 this->info.size = bfd_get_section_size (sectp);
2383 else if (section_is_p (sectp->name, &names.abbrev))
2385 this->abbrev.s.section = sectp;
2386 this->abbrev.size = bfd_get_section_size (sectp);
2388 else if (section_is_p (sectp->name, &names.line))
2390 this->line.s.section = sectp;
2391 this->line.size = bfd_get_section_size (sectp);
2393 else if (section_is_p (sectp->name, &names.loc))
2395 this->loc.s.section = sectp;
2396 this->loc.size = bfd_get_section_size (sectp);
2398 else if (section_is_p (sectp->name, &names.loclists))
2400 this->loclists.s.section = sectp;
2401 this->loclists.size = bfd_get_section_size (sectp);
2403 else if (section_is_p (sectp->name, &names.macinfo))
2405 this->macinfo.s.section = sectp;
2406 this->macinfo.size = bfd_get_section_size (sectp);
2408 else if (section_is_p (sectp->name, &names.macro))
2410 this->macro.s.section = sectp;
2411 this->macro.size = bfd_get_section_size (sectp);
2413 else if (section_is_p (sectp->name, &names.str))
2415 this->str.s.section = sectp;
2416 this->str.size = bfd_get_section_size (sectp);
2418 else if (section_is_p (sectp->name, &names.line_str))
2420 this->line_str.s.section = sectp;
2421 this->line_str.size = bfd_get_section_size (sectp);
2423 else if (section_is_p (sectp->name, &names.addr))
2425 this->addr.s.section = sectp;
2426 this->addr.size = bfd_get_section_size (sectp);
2428 else if (section_is_p (sectp->name, &names.frame))
2430 this->frame.s.section = sectp;
2431 this->frame.size = bfd_get_section_size (sectp);
2433 else if (section_is_p (sectp->name, &names.eh_frame))
2435 this->eh_frame.s.section = sectp;
2436 this->eh_frame.size = bfd_get_section_size (sectp);
2438 else if (section_is_p (sectp->name, &names.ranges))
2440 this->ranges.s.section = sectp;
2441 this->ranges.size = bfd_get_section_size (sectp);
2443 else if (section_is_p (sectp->name, &names.rnglists))
2445 this->rnglists.s.section = sectp;
2446 this->rnglists.size = bfd_get_section_size (sectp);
2448 else if (section_is_p (sectp->name, &names.types))
2450 struct dwarf2_section_info type_section;
2452 memset (&type_section, 0, sizeof (type_section));
2453 type_section.s.section = sectp;
2454 type_section.size = bfd_get_section_size (sectp);
2456 VEC_safe_push (dwarf2_section_info_def, this->types,
2459 else if (section_is_p (sectp->name, &names.gdb_index))
2461 this->gdb_index.s.section = sectp;
2462 this->gdb_index.size = bfd_get_section_size (sectp);
2464 else if (section_is_p (sectp->name, &names.debug_names))
2466 this->debug_names.s.section = sectp;
2467 this->debug_names.size = bfd_get_section_size (sectp);
2469 else if (section_is_p (sectp->name, &names.debug_aranges))
2471 this->debug_aranges.s.section = sectp;
2472 this->debug_aranges.size = bfd_get_section_size (sectp);
2475 if ((bfd_get_section_flags (abfd, sectp) & (SEC_LOAD | SEC_ALLOC))
2476 && bfd_section_vma (abfd, sectp) == 0)
2477 this->has_section_at_zero = true;
2480 /* A helper function that decides whether a section is empty,
2484 dwarf2_section_empty_p (const struct dwarf2_section_info *section)
2486 if (section->is_virtual)
2487 return section->size == 0;
2488 return section->s.section == NULL || section->size == 0;
2491 /* See dwarf2read.h. */
2494 dwarf2_read_section (struct objfile *objfile, dwarf2_section_info *info)
2498 gdb_byte *buf, *retbuf;
2502 info->buffer = NULL;
2505 if (dwarf2_section_empty_p (info))
2508 sectp = get_section_bfd_section (info);
2510 /* If this is a virtual section we need to read in the real one first. */
2511 if (info->is_virtual)
2513 struct dwarf2_section_info *containing_section =
2514 get_containing_section (info);
2516 gdb_assert (sectp != NULL);
2517 if ((sectp->flags & SEC_RELOC) != 0)
2519 error (_("Dwarf Error: DWP format V2 with relocations is not"
2520 " supported in section %s [in module %s]"),
2521 get_section_name (info), get_section_file_name (info));
2523 dwarf2_read_section (objfile, containing_section);
2524 /* Other code should have already caught virtual sections that don't
2526 gdb_assert (info->virtual_offset + info->size
2527 <= containing_section->size);
2528 /* If the real section is empty or there was a problem reading the
2529 section we shouldn't get here. */
2530 gdb_assert (containing_section->buffer != NULL);
2531 info->buffer = containing_section->buffer + info->virtual_offset;
2535 /* If the section has relocations, we must read it ourselves.
2536 Otherwise we attach it to the BFD. */
2537 if ((sectp->flags & SEC_RELOC) == 0)
2539 info->buffer = gdb_bfd_map_section (sectp, &info->size);
2543 buf = (gdb_byte *) obstack_alloc (&objfile->objfile_obstack, info->size);
2546 /* When debugging .o files, we may need to apply relocations; see
2547 http://sourceware.org/ml/gdb-patches/2002-04/msg00136.html .
2548 We never compress sections in .o files, so we only need to
2549 try this when the section is not compressed. */
2550 retbuf = symfile_relocate_debug_section (objfile, sectp, buf);
2553 info->buffer = retbuf;
2557 abfd = get_section_bfd_owner (info);
2558 gdb_assert (abfd != NULL);
2560 if (bfd_seek (abfd, sectp->filepos, SEEK_SET) != 0
2561 || bfd_bread (buf, info->size, abfd) != info->size)
2563 error (_("Dwarf Error: Can't read DWARF data"
2564 " in section %s [in module %s]"),
2565 bfd_section_name (abfd, sectp), bfd_get_filename (abfd));
2569 /* A helper function that returns the size of a section in a safe way.
2570 If you are positive that the section has been read before using the
2571 size, then it is safe to refer to the dwarf2_section_info object's
2572 "size" field directly. In other cases, you must call this
2573 function, because for compressed sections the size field is not set
2574 correctly until the section has been read. */
2576 static bfd_size_type
2577 dwarf2_section_size (struct objfile *objfile,
2578 struct dwarf2_section_info *info)
2581 dwarf2_read_section (objfile, info);
2585 /* Fill in SECTP, BUFP and SIZEP with section info, given OBJFILE and
2589 dwarf2_get_section_info (struct objfile *objfile,
2590 enum dwarf2_section_enum sect,
2591 asection **sectp, const gdb_byte **bufp,
2592 bfd_size_type *sizep)
2594 struct dwarf2_per_objfile *data = dwarf2_objfile_data_key.get (objfile);
2595 struct dwarf2_section_info *info;
2597 /* We may see an objfile without any DWARF, in which case we just
2608 case DWARF2_DEBUG_FRAME:
2609 info = &data->frame;
2611 case DWARF2_EH_FRAME:
2612 info = &data->eh_frame;
2615 gdb_assert_not_reached ("unexpected section");
2618 dwarf2_read_section (objfile, info);
2620 *sectp = get_section_bfd_section (info);
2621 *bufp = info->buffer;
2622 *sizep = info->size;
2625 /* A helper function to find the sections for a .dwz file. */
2628 locate_dwz_sections (bfd *abfd, asection *sectp, void *arg)
2630 struct dwz_file *dwz_file = (struct dwz_file *) arg;
2632 /* Note that we only support the standard ELF names, because .dwz
2633 is ELF-only (at the time of writing). */
2634 if (section_is_p (sectp->name, &dwarf2_elf_names.abbrev))
2636 dwz_file->abbrev.s.section = sectp;
2637 dwz_file->abbrev.size = bfd_get_section_size (sectp);
2639 else if (section_is_p (sectp->name, &dwarf2_elf_names.info))
2641 dwz_file->info.s.section = sectp;
2642 dwz_file->info.size = bfd_get_section_size (sectp);
2644 else if (section_is_p (sectp->name, &dwarf2_elf_names.str))
2646 dwz_file->str.s.section = sectp;
2647 dwz_file->str.size = bfd_get_section_size (sectp);
2649 else if (section_is_p (sectp->name, &dwarf2_elf_names.line))
2651 dwz_file->line.s.section = sectp;
2652 dwz_file->line.size = bfd_get_section_size (sectp);
2654 else if (section_is_p (sectp->name, &dwarf2_elf_names.macro))
2656 dwz_file->macro.s.section = sectp;
2657 dwz_file->macro.size = bfd_get_section_size (sectp);
2659 else if (section_is_p (sectp->name, &dwarf2_elf_names.gdb_index))
2661 dwz_file->gdb_index.s.section = sectp;
2662 dwz_file->gdb_index.size = bfd_get_section_size (sectp);
2664 else if (section_is_p (sectp->name, &dwarf2_elf_names.debug_names))
2666 dwz_file->debug_names.s.section = sectp;
2667 dwz_file->debug_names.size = bfd_get_section_size (sectp);
2671 /* Open the separate '.dwz' debug file, if needed. Return NULL if
2672 there is no .gnu_debugaltlink section in the file. Error if there
2673 is such a section but the file cannot be found. */
2675 static struct dwz_file *
2676 dwarf2_get_dwz_file (struct dwarf2_per_objfile *dwarf2_per_objfile)
2678 const char *filename;
2679 bfd_size_type buildid_len_arg;
2683 if (dwarf2_per_objfile->dwz_file != NULL)
2684 return dwarf2_per_objfile->dwz_file.get ();
2686 bfd_set_error (bfd_error_no_error);
2687 gdb::unique_xmalloc_ptr<char> data
2688 (bfd_get_alt_debug_link_info (dwarf2_per_objfile->objfile->obfd,
2689 &buildid_len_arg, &buildid));
2692 if (bfd_get_error () == bfd_error_no_error)
2694 error (_("could not read '.gnu_debugaltlink' section: %s"),
2695 bfd_errmsg (bfd_get_error ()));
2698 gdb::unique_xmalloc_ptr<bfd_byte> buildid_holder (buildid);
2700 buildid_len = (size_t) buildid_len_arg;
2702 filename = data.get ();
2704 std::string abs_storage;
2705 if (!IS_ABSOLUTE_PATH (filename))
2707 gdb::unique_xmalloc_ptr<char> abs
2708 = gdb_realpath (objfile_name (dwarf2_per_objfile->objfile));
2710 abs_storage = ldirname (abs.get ()) + SLASH_STRING + filename;
2711 filename = abs_storage.c_str ();
2714 /* First try the file name given in the section. If that doesn't
2715 work, try to use the build-id instead. */
2716 gdb_bfd_ref_ptr dwz_bfd (gdb_bfd_open (filename, gnutarget, -1));
2717 if (dwz_bfd != NULL)
2719 if (!build_id_verify (dwz_bfd.get (), buildid_len, buildid))
2720 dwz_bfd.reset (nullptr);
2723 if (dwz_bfd == NULL)
2724 dwz_bfd = build_id_to_debug_bfd (buildid_len, buildid);
2726 if (dwz_bfd == NULL)
2727 error (_("could not find '.gnu_debugaltlink' file for %s"),
2728 objfile_name (dwarf2_per_objfile->objfile));
2730 std::unique_ptr<struct dwz_file> result
2731 (new struct dwz_file (std::move (dwz_bfd)));
2733 bfd_map_over_sections (result->dwz_bfd.get (), locate_dwz_sections,
2736 gdb_bfd_record_inclusion (dwarf2_per_objfile->objfile->obfd,
2737 result->dwz_bfd.get ());
2738 dwarf2_per_objfile->dwz_file = std::move (result);
2739 return dwarf2_per_objfile->dwz_file.get ();
2742 /* DWARF quick_symbols_functions support. */
2744 /* TUs can share .debug_line entries, and there can be a lot more TUs than
2745 unique line tables, so we maintain a separate table of all .debug_line
2746 derived entries to support the sharing.
2747 All the quick functions need is the list of file names. We discard the
2748 line_header when we're done and don't need to record it here. */
2749 struct quick_file_names
2751 /* The data used to construct the hash key. */
2752 struct stmt_list_hash hash;
2754 /* The number of entries in file_names, real_names. */
2755 unsigned int num_file_names;
2757 /* The file names from the line table, after being run through
2759 const char **file_names;
2761 /* The file names from the line table after being run through
2762 gdb_realpath. These are computed lazily. */
2763 const char **real_names;
2766 /* When using the index (and thus not using psymtabs), each CU has an
2767 object of this type. This is used to hold information needed by
2768 the various "quick" methods. */
2769 struct dwarf2_per_cu_quick_data
2771 /* The file table. This can be NULL if there was no file table
2772 or it's currently not read in.
2773 NOTE: This points into dwarf2_per_objfile->quick_file_names_table. */
2774 struct quick_file_names *file_names;
2776 /* The corresponding symbol table. This is NULL if symbols for this
2777 CU have not yet been read. */
2778 struct compunit_symtab *compunit_symtab;
2780 /* A temporary mark bit used when iterating over all CUs in
2781 expand_symtabs_matching. */
2782 unsigned int mark : 1;
2784 /* True if we've tried to read the file table and found there isn't one.
2785 There will be no point in trying to read it again next time. */
2786 unsigned int no_file_data : 1;
2789 /* Utility hash function for a stmt_list_hash. */
2792 hash_stmt_list_entry (const struct stmt_list_hash *stmt_list_hash)
2796 if (stmt_list_hash->dwo_unit != NULL)
2797 v += (uintptr_t) stmt_list_hash->dwo_unit->dwo_file;
2798 v += to_underlying (stmt_list_hash->line_sect_off);
2802 /* Utility equality function for a stmt_list_hash. */
2805 eq_stmt_list_entry (const struct stmt_list_hash *lhs,
2806 const struct stmt_list_hash *rhs)
2808 if ((lhs->dwo_unit != NULL) != (rhs->dwo_unit != NULL))
2810 if (lhs->dwo_unit != NULL
2811 && lhs->dwo_unit->dwo_file != rhs->dwo_unit->dwo_file)
2814 return lhs->line_sect_off == rhs->line_sect_off;
2817 /* Hash function for a quick_file_names. */
2820 hash_file_name_entry (const void *e)
2822 const struct quick_file_names *file_data
2823 = (const struct quick_file_names *) e;
2825 return hash_stmt_list_entry (&file_data->hash);
2828 /* Equality function for a quick_file_names. */
2831 eq_file_name_entry (const void *a, const void *b)
2833 const struct quick_file_names *ea = (const struct quick_file_names *) a;
2834 const struct quick_file_names *eb = (const struct quick_file_names *) b;
2836 return eq_stmt_list_entry (&ea->hash, &eb->hash);
2839 /* Delete function for a quick_file_names. */
2842 delete_file_name_entry (void *e)
2844 struct quick_file_names *file_data = (struct quick_file_names *) e;
2847 for (i = 0; i < file_data->num_file_names; ++i)
2849 xfree ((void*) file_data->file_names[i]);
2850 if (file_data->real_names)
2851 xfree ((void*) file_data->real_names[i]);
2854 /* The space for the struct itself lives on objfile_obstack,
2855 so we don't free it here. */
2858 /* Create a quick_file_names hash table. */
2861 create_quick_file_names_table (unsigned int nr_initial_entries)
2863 return htab_create_alloc (nr_initial_entries,
2864 hash_file_name_entry, eq_file_name_entry,
2865 delete_file_name_entry, xcalloc, xfree);
2868 /* Read in PER_CU->CU. This function is unrelated to symtabs, symtab would
2869 have to be created afterwards. You should call age_cached_comp_units after
2870 processing PER_CU->CU. dw2_setup must have been already called. */
2873 load_cu (struct dwarf2_per_cu_data *per_cu, bool skip_partial)
2875 if (per_cu->is_debug_types)
2876 load_full_type_unit (per_cu);
2878 load_full_comp_unit (per_cu, skip_partial, language_minimal);
2880 if (per_cu->cu == NULL)
2881 return; /* Dummy CU. */
2883 dwarf2_find_base_address (per_cu->cu->dies, per_cu->cu);
2886 /* Read in the symbols for PER_CU. */
2889 dw2_do_instantiate_symtab (struct dwarf2_per_cu_data *per_cu, bool skip_partial)
2891 struct dwarf2_per_objfile *dwarf2_per_objfile = per_cu->dwarf2_per_objfile;
2893 /* Skip type_unit_groups, reading the type units they contain
2894 is handled elsewhere. */
2895 if (IS_TYPE_UNIT_GROUP (per_cu))
2898 /* The destructor of dwarf2_queue_guard frees any entries left on
2899 the queue. After this point we're guaranteed to leave this function
2900 with the dwarf queue empty. */
2901 dwarf2_queue_guard q_guard;
2903 if (dwarf2_per_objfile->using_index
2904 ? per_cu->v.quick->compunit_symtab == NULL
2905 : (per_cu->v.psymtab == NULL || !per_cu->v.psymtab->readin))
2907 queue_comp_unit (per_cu, language_minimal);
2908 load_cu (per_cu, skip_partial);
2910 /* If we just loaded a CU from a DWO, and we're working with an index
2911 that may badly handle TUs, load all the TUs in that DWO as well.
2912 http://sourceware.org/bugzilla/show_bug.cgi?id=15021 */
2913 if (!per_cu->is_debug_types
2914 && per_cu->cu != NULL
2915 && per_cu->cu->dwo_unit != NULL
2916 && dwarf2_per_objfile->index_table != NULL
2917 && dwarf2_per_objfile->index_table->version <= 7
2918 /* DWP files aren't supported yet. */
2919 && get_dwp_file (dwarf2_per_objfile) == NULL)
2920 queue_and_load_all_dwo_tus (per_cu);
2923 process_queue (dwarf2_per_objfile);
2925 /* Age the cache, releasing compilation units that have not
2926 been used recently. */
2927 age_cached_comp_units (dwarf2_per_objfile);
2930 /* Ensure that the symbols for PER_CU have been read in. OBJFILE is
2931 the objfile from which this CU came. Returns the resulting symbol
2934 static struct compunit_symtab *
2935 dw2_instantiate_symtab (struct dwarf2_per_cu_data *per_cu, bool skip_partial)
2937 struct dwarf2_per_objfile *dwarf2_per_objfile = per_cu->dwarf2_per_objfile;
2939 gdb_assert (dwarf2_per_objfile->using_index);
2940 if (!per_cu->v.quick->compunit_symtab)
2942 free_cached_comp_units freer (dwarf2_per_objfile);
2943 scoped_restore decrementer = increment_reading_symtab ();
2944 dw2_do_instantiate_symtab (per_cu, skip_partial);
2945 process_cu_includes (dwarf2_per_objfile);
2948 return per_cu->v.quick->compunit_symtab;
2951 /* See declaration. */
2953 dwarf2_per_cu_data *
2954 dwarf2_per_objfile::get_cutu (int index)
2956 if (index >= this->all_comp_units.size ())
2958 index -= this->all_comp_units.size ();
2959 gdb_assert (index < this->all_type_units.size ());
2960 return &this->all_type_units[index]->per_cu;
2963 return this->all_comp_units[index];
2966 /* See declaration. */
2968 dwarf2_per_cu_data *
2969 dwarf2_per_objfile::get_cu (int index)
2971 gdb_assert (index >= 0 && index < this->all_comp_units.size ());
2973 return this->all_comp_units[index];
2976 /* See declaration. */
2979 dwarf2_per_objfile::get_tu (int index)
2981 gdb_assert (index >= 0 && index < this->all_type_units.size ());
2983 return this->all_type_units[index];
2986 /* Return a new dwarf2_per_cu_data allocated on OBJFILE's
2987 objfile_obstack, and constructed with the specified field
2990 static dwarf2_per_cu_data *
2991 create_cu_from_index_list (struct dwarf2_per_objfile *dwarf2_per_objfile,
2992 struct dwarf2_section_info *section,
2994 sect_offset sect_off, ULONGEST length)
2996 struct objfile *objfile = dwarf2_per_objfile->objfile;
2997 dwarf2_per_cu_data *the_cu
2998 = OBSTACK_ZALLOC (&objfile->objfile_obstack,
2999 struct dwarf2_per_cu_data);
3000 the_cu->sect_off = sect_off;
3001 the_cu->length = length;
3002 the_cu->dwarf2_per_objfile = dwarf2_per_objfile;
3003 the_cu->section = section;
3004 the_cu->v.quick = OBSTACK_ZALLOC (&objfile->objfile_obstack,
3005 struct dwarf2_per_cu_quick_data);
3006 the_cu->is_dwz = is_dwz;
3010 /* A helper for create_cus_from_index that handles a given list of
3014 create_cus_from_index_list (struct dwarf2_per_objfile *dwarf2_per_objfile,
3015 const gdb_byte *cu_list, offset_type n_elements,
3016 struct dwarf2_section_info *section,
3019 for (offset_type i = 0; i < n_elements; i += 2)
3021 gdb_static_assert (sizeof (ULONGEST) >= 8);
3023 sect_offset sect_off
3024 = (sect_offset) extract_unsigned_integer (cu_list, 8, BFD_ENDIAN_LITTLE);
3025 ULONGEST length = extract_unsigned_integer (cu_list + 8, 8, BFD_ENDIAN_LITTLE);
3028 dwarf2_per_cu_data *per_cu
3029 = create_cu_from_index_list (dwarf2_per_objfile, section, is_dwz,
3031 dwarf2_per_objfile->all_comp_units.push_back (per_cu);
3035 /* Read the CU list from the mapped index, and use it to create all
3036 the CU objects for this objfile. */
3039 create_cus_from_index (struct dwarf2_per_objfile *dwarf2_per_objfile,
3040 const gdb_byte *cu_list, offset_type cu_list_elements,
3041 const gdb_byte *dwz_list, offset_type dwz_elements)
3043 gdb_assert (dwarf2_per_objfile->all_comp_units.empty ());
3044 dwarf2_per_objfile->all_comp_units.reserve
3045 ((cu_list_elements + dwz_elements) / 2);
3047 create_cus_from_index_list (dwarf2_per_objfile, cu_list, cu_list_elements,
3048 &dwarf2_per_objfile->info, 0);
3050 if (dwz_elements == 0)
3053 dwz_file *dwz = dwarf2_get_dwz_file (dwarf2_per_objfile);
3054 create_cus_from_index_list (dwarf2_per_objfile, dwz_list, dwz_elements,
3058 /* Create the signatured type hash table from the index. */
3061 create_signatured_type_table_from_index
3062 (struct dwarf2_per_objfile *dwarf2_per_objfile,
3063 struct dwarf2_section_info *section,
3064 const gdb_byte *bytes,
3065 offset_type elements)
3067 struct objfile *objfile = dwarf2_per_objfile->objfile;
3069 gdb_assert (dwarf2_per_objfile->all_type_units.empty ());
3070 dwarf2_per_objfile->all_type_units.reserve (elements / 3);
3072 htab_t sig_types_hash = allocate_signatured_type_table (objfile);
3074 for (offset_type i = 0; i < elements; i += 3)
3076 struct signatured_type *sig_type;
3079 cu_offset type_offset_in_tu;
3081 gdb_static_assert (sizeof (ULONGEST) >= 8);
3082 sect_offset sect_off
3083 = (sect_offset) extract_unsigned_integer (bytes, 8, BFD_ENDIAN_LITTLE);
3085 = (cu_offset) extract_unsigned_integer (bytes + 8, 8,
3087 signature = extract_unsigned_integer (bytes + 16, 8, BFD_ENDIAN_LITTLE);
3090 sig_type = OBSTACK_ZALLOC (&objfile->objfile_obstack,
3091 struct signatured_type);
3092 sig_type->signature = signature;
3093 sig_type->type_offset_in_tu = type_offset_in_tu;
3094 sig_type->per_cu.is_debug_types = 1;
3095 sig_type->per_cu.section = section;
3096 sig_type->per_cu.sect_off = sect_off;
3097 sig_type->per_cu.dwarf2_per_objfile = dwarf2_per_objfile;
3098 sig_type->per_cu.v.quick
3099 = OBSTACK_ZALLOC (&objfile->objfile_obstack,
3100 struct dwarf2_per_cu_quick_data);
3102 slot = htab_find_slot (sig_types_hash, sig_type, INSERT);
3105 dwarf2_per_objfile->all_type_units.push_back (sig_type);
3108 dwarf2_per_objfile->signatured_types = sig_types_hash;
3111 /* Create the signatured type hash table from .debug_names. */
3114 create_signatured_type_table_from_debug_names
3115 (struct dwarf2_per_objfile *dwarf2_per_objfile,
3116 const mapped_debug_names &map,
3117 struct dwarf2_section_info *section,
3118 struct dwarf2_section_info *abbrev_section)
3120 struct objfile *objfile = dwarf2_per_objfile->objfile;
3122 dwarf2_read_section (objfile, section);
3123 dwarf2_read_section (objfile, abbrev_section);
3125 gdb_assert (dwarf2_per_objfile->all_type_units.empty ());
3126 dwarf2_per_objfile->all_type_units.reserve (map.tu_count);
3128 htab_t sig_types_hash = allocate_signatured_type_table (objfile);
3130 for (uint32_t i = 0; i < map.tu_count; ++i)
3132 struct signatured_type *sig_type;
3135 sect_offset sect_off
3136 = (sect_offset) (extract_unsigned_integer
3137 (map.tu_table_reordered + i * map.offset_size,
3139 map.dwarf5_byte_order));
3141 comp_unit_head cu_header;
3142 read_and_check_comp_unit_head (dwarf2_per_objfile, &cu_header, section,
3144 section->buffer + to_underlying (sect_off),
3147 sig_type = OBSTACK_ZALLOC (&objfile->objfile_obstack,
3148 struct signatured_type);
3149 sig_type->signature = cu_header.signature;
3150 sig_type->type_offset_in_tu = cu_header.type_cu_offset_in_tu;
3151 sig_type->per_cu.is_debug_types = 1;
3152 sig_type->per_cu.section = section;
3153 sig_type->per_cu.sect_off = sect_off;
3154 sig_type->per_cu.dwarf2_per_objfile = dwarf2_per_objfile;
3155 sig_type->per_cu.v.quick
3156 = OBSTACK_ZALLOC (&objfile->objfile_obstack,
3157 struct dwarf2_per_cu_quick_data);
3159 slot = htab_find_slot (sig_types_hash, sig_type, INSERT);
3162 dwarf2_per_objfile->all_type_units.push_back (sig_type);
3165 dwarf2_per_objfile->signatured_types = sig_types_hash;
3168 /* Read the address map data from the mapped index, and use it to
3169 populate the objfile's psymtabs_addrmap. */
3172 create_addrmap_from_index (struct dwarf2_per_objfile *dwarf2_per_objfile,
3173 struct mapped_index *index)
3175 struct objfile *objfile = dwarf2_per_objfile->objfile;
3176 struct gdbarch *gdbarch = get_objfile_arch (objfile);
3177 const gdb_byte *iter, *end;
3178 struct addrmap *mutable_map;
3181 auto_obstack temp_obstack;
3183 mutable_map = addrmap_create_mutable (&temp_obstack);
3185 iter = index->address_table.data ();
3186 end = iter + index->address_table.size ();
3188 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
3192 ULONGEST hi, lo, cu_index;
3193 lo = extract_unsigned_integer (iter, 8, BFD_ENDIAN_LITTLE);
3195 hi = extract_unsigned_integer (iter, 8, BFD_ENDIAN_LITTLE);
3197 cu_index = extract_unsigned_integer (iter, 4, BFD_ENDIAN_LITTLE);
3202 complaint (_(".gdb_index address table has invalid range (%s - %s)"),
3203 hex_string (lo), hex_string (hi));
3207 if (cu_index >= dwarf2_per_objfile->all_comp_units.size ())
3209 complaint (_(".gdb_index address table has invalid CU number %u"),
3210 (unsigned) cu_index);
3214 lo = gdbarch_adjust_dwarf2_addr (gdbarch, lo + baseaddr) - baseaddr;
3215 hi = gdbarch_adjust_dwarf2_addr (gdbarch, hi + baseaddr) - baseaddr;
3216 addrmap_set_empty (mutable_map, lo, hi - 1,
3217 dwarf2_per_objfile->get_cu (cu_index));
3220 objfile->partial_symtabs->psymtabs_addrmap
3221 = addrmap_create_fixed (mutable_map, objfile->partial_symtabs->obstack ());
3224 /* Read the address map data from DWARF-5 .debug_aranges, and use it to
3225 populate the objfile's psymtabs_addrmap. */
3228 create_addrmap_from_aranges (struct dwarf2_per_objfile *dwarf2_per_objfile,
3229 struct dwarf2_section_info *section)
3231 struct objfile *objfile = dwarf2_per_objfile->objfile;
3232 bfd *abfd = objfile->obfd;
3233 struct gdbarch *gdbarch = get_objfile_arch (objfile);
3234 const CORE_ADDR baseaddr = ANOFFSET (objfile->section_offsets,
3235 SECT_OFF_TEXT (objfile));
3237 auto_obstack temp_obstack;
3238 addrmap *mutable_map = addrmap_create_mutable (&temp_obstack);
3240 std::unordered_map<sect_offset,
3241 dwarf2_per_cu_data *,
3242 gdb::hash_enum<sect_offset>>
3243 debug_info_offset_to_per_cu;
3244 for (dwarf2_per_cu_data *per_cu : dwarf2_per_objfile->all_comp_units)
3246 const auto insertpair
3247 = debug_info_offset_to_per_cu.emplace (per_cu->sect_off, per_cu);
3248 if (!insertpair.second)
3250 warning (_("Section .debug_aranges in %s has duplicate "
3251 "debug_info_offset %s, ignoring .debug_aranges."),
3252 objfile_name (objfile), sect_offset_str (per_cu->sect_off));
3257 dwarf2_read_section (objfile, section);
3259 const bfd_endian dwarf5_byte_order = gdbarch_byte_order (gdbarch);
3261 const gdb_byte *addr = section->buffer;
3263 while (addr < section->buffer + section->size)
3265 const gdb_byte *const entry_addr = addr;
3266 unsigned int bytes_read;
3268 const LONGEST entry_length = read_initial_length (abfd, addr,
3272 const gdb_byte *const entry_end = addr + entry_length;
3273 const bool dwarf5_is_dwarf64 = bytes_read != 4;
3274 const uint8_t offset_size = dwarf5_is_dwarf64 ? 8 : 4;
3275 if (addr + entry_length > section->buffer + section->size)
3277 warning (_("Section .debug_aranges in %s entry at offset %zu "
3278 "length %s exceeds section length %s, "
3279 "ignoring .debug_aranges."),
3280 objfile_name (objfile), entry_addr - section->buffer,
3281 plongest (bytes_read + entry_length),
3282 pulongest (section->size));
3286 /* The version number. */
3287 const uint16_t version = read_2_bytes (abfd, addr);
3291 warning (_("Section .debug_aranges in %s entry at offset %zu "
3292 "has unsupported version %d, ignoring .debug_aranges."),
3293 objfile_name (objfile), entry_addr - section->buffer,
3298 const uint64_t debug_info_offset
3299 = extract_unsigned_integer (addr, offset_size, dwarf5_byte_order);
3300 addr += offset_size;
3301 const auto per_cu_it
3302 = debug_info_offset_to_per_cu.find (sect_offset (debug_info_offset));
3303 if (per_cu_it == debug_info_offset_to_per_cu.cend ())
3305 warning (_("Section .debug_aranges in %s entry at offset %zu "
3306 "debug_info_offset %s does not exists, "
3307 "ignoring .debug_aranges."),
3308 objfile_name (objfile), entry_addr - section->buffer,
3309 pulongest (debug_info_offset));
3312 dwarf2_per_cu_data *const per_cu = per_cu_it->second;
3314 const uint8_t address_size = *addr++;
3315 if (address_size < 1 || address_size > 8)
3317 warning (_("Section .debug_aranges in %s entry at offset %zu "
3318 "address_size %u is invalid, ignoring .debug_aranges."),
3319 objfile_name (objfile), entry_addr - section->buffer,
3324 const uint8_t segment_selector_size = *addr++;
3325 if (segment_selector_size != 0)
3327 warning (_("Section .debug_aranges in %s entry at offset %zu "
3328 "segment_selector_size %u is not supported, "
3329 "ignoring .debug_aranges."),
3330 objfile_name (objfile), entry_addr - section->buffer,
3331 segment_selector_size);
3335 /* Must pad to an alignment boundary that is twice the address
3336 size. It is undocumented by the DWARF standard but GCC does
3338 for (size_t padding = ((-(addr - section->buffer))
3339 & (2 * address_size - 1));
3340 padding > 0; padding--)
3343 warning (_("Section .debug_aranges in %s entry at offset %zu "
3344 "padding is not zero, ignoring .debug_aranges."),
3345 objfile_name (objfile), entry_addr - section->buffer);
3351 if (addr + 2 * address_size > entry_end)
3353 warning (_("Section .debug_aranges in %s entry at offset %zu "
3354 "address list is not properly terminated, "
3355 "ignoring .debug_aranges."),
3356 objfile_name (objfile), entry_addr - section->buffer);
3359 ULONGEST start = extract_unsigned_integer (addr, address_size,
3361 addr += address_size;
3362 ULONGEST length = extract_unsigned_integer (addr, address_size,
3364 addr += address_size;
3365 if (start == 0 && length == 0)
3367 if (start == 0 && !dwarf2_per_objfile->has_section_at_zero)
3369 /* Symbol was eliminated due to a COMDAT group. */
3372 ULONGEST end = start + length;
3373 start = (gdbarch_adjust_dwarf2_addr (gdbarch, start + baseaddr)
3375 end = (gdbarch_adjust_dwarf2_addr (gdbarch, end + baseaddr)
3377 addrmap_set_empty (mutable_map, start, end - 1, per_cu);
3381 objfile->partial_symtabs->psymtabs_addrmap
3382 = addrmap_create_fixed (mutable_map, objfile->partial_symtabs->obstack ());
3385 /* Find a slot in the mapped index INDEX for the object named NAME.
3386 If NAME is found, set *VEC_OUT to point to the CU vector in the
3387 constant pool and return true. If NAME cannot be found, return
3391 find_slot_in_mapped_hash (struct mapped_index *index, const char *name,
3392 offset_type **vec_out)
3395 offset_type slot, step;
3396 int (*cmp) (const char *, const char *);
3398 gdb::unique_xmalloc_ptr<char> without_params;
3399 if (current_language->la_language == language_cplus
3400 || current_language->la_language == language_fortran
3401 || current_language->la_language == language_d)
3403 /* NAME is already canonical. Drop any qualifiers as .gdb_index does
3406 if (strchr (name, '(') != NULL)
3408 without_params = cp_remove_params (name);
3410 if (without_params != NULL)
3411 name = without_params.get ();
3415 /* Index version 4 did not support case insensitive searches. But the
3416 indices for case insensitive languages are built in lowercase, therefore
3417 simulate our NAME being searched is also lowercased. */
3418 hash = mapped_index_string_hash ((index->version == 4
3419 && case_sensitivity == case_sensitive_off
3420 ? 5 : index->version),
3423 slot = hash & (index->symbol_table.size () - 1);
3424 step = ((hash * 17) & (index->symbol_table.size () - 1)) | 1;
3425 cmp = (case_sensitivity == case_sensitive_on ? strcmp : strcasecmp);
3431 const auto &bucket = index->symbol_table[slot];
3432 if (bucket.name == 0 && bucket.vec == 0)
3435 str = index->constant_pool + MAYBE_SWAP (bucket.name);
3436 if (!cmp (name, str))
3438 *vec_out = (offset_type *) (index->constant_pool
3439 + MAYBE_SWAP (bucket.vec));
3443 slot = (slot + step) & (index->symbol_table.size () - 1);
3447 /* A helper function that reads the .gdb_index from BUFFER and fills
3448 in MAP. FILENAME is the name of the file containing the data;
3449 it is used for error reporting. DEPRECATED_OK is true if it is
3450 ok to use deprecated sections.
3452 CU_LIST, CU_LIST_ELEMENTS, TYPES_LIST, and TYPES_LIST_ELEMENTS are
3453 out parameters that are filled in with information about the CU and
3454 TU lists in the section.
3456 Returns true if all went well, false otherwise. */
3459 read_gdb_index_from_buffer (struct objfile *objfile,
3460 const char *filename,
3462 gdb::array_view<const gdb_byte> buffer,
3463 struct mapped_index *map,
3464 const gdb_byte **cu_list,
3465 offset_type *cu_list_elements,
3466 const gdb_byte **types_list,
3467 offset_type *types_list_elements)
3469 const gdb_byte *addr = &buffer[0];
3471 /* Version check. */
3472 offset_type version = MAYBE_SWAP (*(offset_type *) addr);
3473 /* Versions earlier than 3 emitted every copy of a psymbol. This
3474 causes the index to behave very poorly for certain requests. Version 3
3475 contained incomplete addrmap. So, it seems better to just ignore such
3479 static int warning_printed = 0;
3480 if (!warning_printed)
3482 warning (_("Skipping obsolete .gdb_index section in %s."),
3484 warning_printed = 1;
3488 /* Index version 4 uses a different hash function than index version
3491 Versions earlier than 6 did not emit psymbols for inlined
3492 functions. Using these files will cause GDB not to be able to
3493 set breakpoints on inlined functions by name, so we ignore these
3494 indices unless the user has done
3495 "set use-deprecated-index-sections on". */
3496 if (version < 6 && !deprecated_ok)
3498 static int warning_printed = 0;
3499 if (!warning_printed)
3502 Skipping deprecated .gdb_index section in %s.\n\
3503 Do \"set use-deprecated-index-sections on\" before the file is read\n\
3504 to use the section anyway."),
3506 warning_printed = 1;
3510 /* Version 7 indices generated by gold refer to the CU for a symbol instead
3511 of the TU (for symbols coming from TUs),
3512 http://sourceware.org/bugzilla/show_bug.cgi?id=15021.
3513 Plus gold-generated indices can have duplicate entries for global symbols,
3514 http://sourceware.org/bugzilla/show_bug.cgi?id=15646.
3515 These are just performance bugs, and we can't distinguish gdb-generated
3516 indices from gold-generated ones, so issue no warning here. */
3518 /* Indexes with higher version than the one supported by GDB may be no
3519 longer backward compatible. */
3523 map->version = version;
3525 offset_type *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 /* Callback types for dwarf2_read_gdb_index. */
3560 typedef gdb::function_view
3561 <gdb::array_view<const gdb_byte>(objfile *, dwarf2_per_objfile *)>
3562 get_gdb_index_contents_ftype;
3563 typedef gdb::function_view
3564 <gdb::array_view<const gdb_byte>(objfile *, dwz_file *)>
3565 get_gdb_index_contents_dwz_ftype;
3567 /* Read .gdb_index. If everything went ok, initialize the "quick"
3568 elements of all the CUs and return 1. Otherwise, return 0. */
3571 dwarf2_read_gdb_index
3572 (struct dwarf2_per_objfile *dwarf2_per_objfile,
3573 get_gdb_index_contents_ftype get_gdb_index_contents,
3574 get_gdb_index_contents_dwz_ftype get_gdb_index_contents_dwz)
3576 const gdb_byte *cu_list, *types_list, *dwz_list = NULL;
3577 offset_type cu_list_elements, types_list_elements, dwz_list_elements = 0;
3578 struct dwz_file *dwz;
3579 struct objfile *objfile = dwarf2_per_objfile->objfile;
3581 gdb::array_view<const gdb_byte> main_index_contents
3582 = get_gdb_index_contents (objfile, dwarf2_per_objfile);
3584 if (main_index_contents.empty ())
3587 std::unique_ptr<struct mapped_index> map (new struct mapped_index);
3588 if (!read_gdb_index_from_buffer (objfile, objfile_name (objfile),
3589 use_deprecated_index_sections,
3590 main_index_contents, map.get (), &cu_list,
3591 &cu_list_elements, &types_list,
3592 &types_list_elements))
3595 /* Don't use the index if it's empty. */
3596 if (map->symbol_table.empty ())
3599 /* If there is a .dwz file, read it so we can get its CU list as
3601 dwz = dwarf2_get_dwz_file (dwarf2_per_objfile);
3604 struct mapped_index dwz_map;
3605 const gdb_byte *dwz_types_ignore;
3606 offset_type dwz_types_elements_ignore;
3608 gdb::array_view<const gdb_byte> dwz_index_content
3609 = get_gdb_index_contents_dwz (objfile, dwz);
3611 if (dwz_index_content.empty ())
3614 if (!read_gdb_index_from_buffer (objfile,
3615 bfd_get_filename (dwz->dwz_bfd), 1,
3616 dwz_index_content, &dwz_map,
3617 &dwz_list, &dwz_list_elements,
3619 &dwz_types_elements_ignore))
3621 warning (_("could not read '.gdb_index' section from %s; skipping"),
3622 bfd_get_filename (dwz->dwz_bfd));
3627 create_cus_from_index (dwarf2_per_objfile, cu_list, cu_list_elements,
3628 dwz_list, dwz_list_elements);
3630 if (types_list_elements)
3632 struct dwarf2_section_info *section;
3634 /* We can only handle a single .debug_types when we have an
3636 if (VEC_length (dwarf2_section_info_def, dwarf2_per_objfile->types) != 1)
3639 section = VEC_index (dwarf2_section_info_def,
3640 dwarf2_per_objfile->types, 0);
3642 create_signatured_type_table_from_index (dwarf2_per_objfile, section,
3643 types_list, types_list_elements);
3646 create_addrmap_from_index (dwarf2_per_objfile, map.get ());
3648 dwarf2_per_objfile->index_table = std::move (map);
3649 dwarf2_per_objfile->using_index = 1;
3650 dwarf2_per_objfile->quick_file_names_table =
3651 create_quick_file_names_table (dwarf2_per_objfile->all_comp_units.size ());
3656 /* die_reader_func for dw2_get_file_names. */
3659 dw2_get_file_names_reader (const struct die_reader_specs *reader,
3660 const gdb_byte *info_ptr,
3661 struct die_info *comp_unit_die,
3665 struct dwarf2_cu *cu = reader->cu;
3666 struct dwarf2_per_cu_data *this_cu = cu->per_cu;
3667 struct dwarf2_per_objfile *dwarf2_per_objfile
3668 = cu->per_cu->dwarf2_per_objfile;
3669 struct objfile *objfile = dwarf2_per_objfile->objfile;
3670 struct dwarf2_per_cu_data *lh_cu;
3671 struct attribute *attr;
3674 struct quick_file_names *qfn;
3676 gdb_assert (! this_cu->is_debug_types);
3678 /* Our callers never want to match partial units -- instead they
3679 will match the enclosing full CU. */
3680 if (comp_unit_die->tag == DW_TAG_partial_unit)
3682 this_cu->v.quick->no_file_data = 1;
3690 sect_offset line_offset {};
3692 attr = dwarf2_attr (comp_unit_die, DW_AT_stmt_list, cu);
3695 struct quick_file_names find_entry;
3697 line_offset = (sect_offset) DW_UNSND (attr);
3699 /* We may have already read in this line header (TU line header sharing).
3700 If we have we're done. */
3701 find_entry.hash.dwo_unit = cu->dwo_unit;
3702 find_entry.hash.line_sect_off = line_offset;
3703 slot = htab_find_slot (dwarf2_per_objfile->quick_file_names_table,
3704 &find_entry, INSERT);
3707 lh_cu->v.quick->file_names = (struct quick_file_names *) *slot;
3711 lh = dwarf_decode_line_header (line_offset, cu);
3715 lh_cu->v.quick->no_file_data = 1;
3719 qfn = XOBNEW (&objfile->objfile_obstack, struct quick_file_names);
3720 qfn->hash.dwo_unit = cu->dwo_unit;
3721 qfn->hash.line_sect_off = line_offset;
3722 gdb_assert (slot != NULL);
3725 file_and_directory fnd = find_file_and_directory (comp_unit_die, cu);
3727 qfn->num_file_names = lh->file_names.size ();
3729 XOBNEWVEC (&objfile->objfile_obstack, const char *, lh->file_names.size ());
3730 for (i = 0; i < lh->file_names.size (); ++i)
3731 qfn->file_names[i] = file_full_name (i + 1, lh.get (), fnd.comp_dir);
3732 qfn->real_names = NULL;
3734 lh_cu->v.quick->file_names = qfn;
3737 /* A helper for the "quick" functions which attempts to read the line
3738 table for THIS_CU. */
3740 static struct quick_file_names *
3741 dw2_get_file_names (struct dwarf2_per_cu_data *this_cu)
3743 /* This should never be called for TUs. */
3744 gdb_assert (! this_cu->is_debug_types);
3745 /* Nor type unit groups. */
3746 gdb_assert (! IS_TYPE_UNIT_GROUP (this_cu));
3748 if (this_cu->v.quick->file_names != NULL)
3749 return this_cu->v.quick->file_names;
3750 /* If we know there is no line data, no point in looking again. */
3751 if (this_cu->v.quick->no_file_data)
3754 init_cutu_and_read_dies_simple (this_cu, dw2_get_file_names_reader, NULL);
3756 if (this_cu->v.quick->no_file_data)
3758 return this_cu->v.quick->file_names;
3761 /* A helper for the "quick" functions which computes and caches the
3762 real path for a given file name from the line table. */
3765 dw2_get_real_path (struct objfile *objfile,
3766 struct quick_file_names *qfn, int index)
3768 if (qfn->real_names == NULL)
3769 qfn->real_names = OBSTACK_CALLOC (&objfile->objfile_obstack,
3770 qfn->num_file_names, const char *);
3772 if (qfn->real_names[index] == NULL)
3773 qfn->real_names[index] = gdb_realpath (qfn->file_names[index]).release ();
3775 return qfn->real_names[index];
3778 static struct symtab *
3779 dw2_find_last_source_symtab (struct objfile *objfile)
3781 struct dwarf2_per_objfile *dwarf2_per_objfile
3782 = get_dwarf2_per_objfile (objfile);
3783 dwarf2_per_cu_data *dwarf_cu = dwarf2_per_objfile->all_comp_units.back ();
3784 compunit_symtab *cust = dw2_instantiate_symtab (dwarf_cu, false);
3789 return compunit_primary_filetab (cust);
3792 /* Traversal function for dw2_forget_cached_source_info. */
3795 dw2_free_cached_file_names (void **slot, void *info)
3797 struct quick_file_names *file_data = (struct quick_file_names *) *slot;
3799 if (file_data->real_names)
3803 for (i = 0; i < file_data->num_file_names; ++i)
3805 xfree ((void*) file_data->real_names[i]);
3806 file_data->real_names[i] = NULL;
3814 dw2_forget_cached_source_info (struct objfile *objfile)
3816 struct dwarf2_per_objfile *dwarf2_per_objfile
3817 = get_dwarf2_per_objfile (objfile);
3819 htab_traverse_noresize (dwarf2_per_objfile->quick_file_names_table,
3820 dw2_free_cached_file_names, NULL);
3823 /* Helper function for dw2_map_symtabs_matching_filename that expands
3824 the symtabs and calls the iterator. */
3827 dw2_map_expand_apply (struct objfile *objfile,
3828 struct dwarf2_per_cu_data *per_cu,
3829 const char *name, const char *real_path,
3830 gdb::function_view<bool (symtab *)> callback)
3832 struct compunit_symtab *last_made = objfile->compunit_symtabs;
3834 /* Don't visit already-expanded CUs. */
3835 if (per_cu->v.quick->compunit_symtab)
3838 /* This may expand more than one symtab, and we want to iterate over
3840 dw2_instantiate_symtab (per_cu, false);
3842 return iterate_over_some_symtabs (name, real_path, objfile->compunit_symtabs,
3843 last_made, callback);
3846 /* Implementation of the map_symtabs_matching_filename method. */
3849 dw2_map_symtabs_matching_filename
3850 (struct objfile *objfile, const char *name, const char *real_path,
3851 gdb::function_view<bool (symtab *)> callback)
3853 const char *name_basename = lbasename (name);
3854 struct dwarf2_per_objfile *dwarf2_per_objfile
3855 = get_dwarf2_per_objfile (objfile);
3857 /* The rule is CUs specify all the files, including those used by
3858 any TU, so there's no need to scan TUs here. */
3860 for (dwarf2_per_cu_data *per_cu : dwarf2_per_objfile->all_comp_units)
3862 /* We only need to look at symtabs not already expanded. */
3863 if (per_cu->v.quick->compunit_symtab)
3866 quick_file_names *file_data = dw2_get_file_names (per_cu);
3867 if (file_data == NULL)
3870 for (int j = 0; j < file_data->num_file_names; ++j)
3872 const char *this_name = file_data->file_names[j];
3873 const char *this_real_name;
3875 if (compare_filenames_for_search (this_name, name))
3877 if (dw2_map_expand_apply (objfile, per_cu, name, real_path,
3883 /* Before we invoke realpath, which can get expensive when many
3884 files are involved, do a quick comparison of the basenames. */
3885 if (! basenames_may_differ
3886 && FILENAME_CMP (lbasename (this_name), name_basename) != 0)
3889 this_real_name = dw2_get_real_path (objfile, file_data, j);
3890 if (compare_filenames_for_search (this_real_name, name))
3892 if (dw2_map_expand_apply (objfile, per_cu, name, real_path,
3898 if (real_path != NULL)
3900 gdb_assert (IS_ABSOLUTE_PATH (real_path));
3901 gdb_assert (IS_ABSOLUTE_PATH (name));
3902 if (this_real_name != NULL
3903 && FILENAME_CMP (real_path, this_real_name) == 0)
3905 if (dw2_map_expand_apply (objfile, per_cu, name, real_path,
3917 /* Struct used to manage iterating over all CUs looking for a symbol. */
3919 struct dw2_symtab_iterator
3921 /* The dwarf2_per_objfile owning the CUs we are iterating on. */
3922 struct dwarf2_per_objfile *dwarf2_per_objfile;
3923 /* If non-zero, only look for symbols that match BLOCK_INDEX. */
3924 int want_specific_block;
3925 /* One of GLOBAL_BLOCK or STATIC_BLOCK.
3926 Unused if !WANT_SPECIFIC_BLOCK. */
3928 /* The kind of symbol we're looking for. */
3930 /* The list of CUs from the index entry of the symbol,
3931 or NULL if not found. */
3933 /* The next element in VEC to look at. */
3935 /* The number of elements in VEC, or zero if there is no match. */
3937 /* Have we seen a global version of the symbol?
3938 If so we can ignore all further global instances.
3939 This is to work around gold/15646, inefficient gold-generated
3944 /* Initialize the index symtab iterator ITER.
3945 If WANT_SPECIFIC_BLOCK is non-zero, only look for symbols
3946 in block BLOCK_INDEX. Otherwise BLOCK_INDEX is ignored. */
3949 dw2_symtab_iter_init (struct dw2_symtab_iterator *iter,
3950 struct dwarf2_per_objfile *dwarf2_per_objfile,
3951 int want_specific_block,
3956 iter->dwarf2_per_objfile = dwarf2_per_objfile;
3957 iter->want_specific_block = want_specific_block;
3958 iter->block_index = block_index;
3959 iter->domain = domain;
3961 iter->global_seen = 0;
3963 mapped_index *index = dwarf2_per_objfile->index_table.get ();
3965 /* index is NULL if OBJF_READNOW. */
3966 if (index != NULL && find_slot_in_mapped_hash (index, name, &iter->vec))
3967 iter->length = MAYBE_SWAP (*iter->vec);
3975 /* Return the next matching CU or NULL if there are no more. */
3977 static struct dwarf2_per_cu_data *
3978 dw2_symtab_iter_next (struct dw2_symtab_iterator *iter)
3980 struct dwarf2_per_objfile *dwarf2_per_objfile = iter->dwarf2_per_objfile;
3982 for ( ; iter->next < iter->length; ++iter->next)
3984 offset_type cu_index_and_attrs =
3985 MAYBE_SWAP (iter->vec[iter->next + 1]);
3986 offset_type cu_index = GDB_INDEX_CU_VALUE (cu_index_and_attrs);
3987 int want_static = iter->block_index != GLOBAL_BLOCK;
3988 /* This value is only valid for index versions >= 7. */
3989 int is_static = GDB_INDEX_SYMBOL_STATIC_VALUE (cu_index_and_attrs);
3990 gdb_index_symbol_kind symbol_kind =
3991 GDB_INDEX_SYMBOL_KIND_VALUE (cu_index_and_attrs);
3992 /* Only check the symbol attributes if they're present.
3993 Indices prior to version 7 don't record them,
3994 and indices >= 7 may elide them for certain symbols
3995 (gold does this). */
3997 (dwarf2_per_objfile->index_table->version >= 7
3998 && symbol_kind != GDB_INDEX_SYMBOL_KIND_NONE);
4000 /* Don't crash on bad data. */
4001 if (cu_index >= (dwarf2_per_objfile->all_comp_units.size ()
4002 + dwarf2_per_objfile->all_type_units.size ()))
4004 complaint (_(".gdb_index entry has bad CU index"
4006 objfile_name (dwarf2_per_objfile->objfile));
4010 dwarf2_per_cu_data *per_cu = dwarf2_per_objfile->get_cutu (cu_index);
4012 /* Skip if already read in. */
4013 if (per_cu->v.quick->compunit_symtab)
4016 /* Check static vs global. */
4019 if (iter->want_specific_block
4020 && want_static != is_static)
4022 /* Work around gold/15646. */
4023 if (!is_static && iter->global_seen)
4026 iter->global_seen = 1;
4029 /* Only check the symbol's kind if it has one. */
4032 switch (iter->domain)
4035 if (symbol_kind != GDB_INDEX_SYMBOL_KIND_VARIABLE
4036 && symbol_kind != GDB_INDEX_SYMBOL_KIND_FUNCTION
4037 /* Some types are also in VAR_DOMAIN. */
4038 && symbol_kind != GDB_INDEX_SYMBOL_KIND_TYPE)
4042 if (symbol_kind != GDB_INDEX_SYMBOL_KIND_TYPE)
4046 if (symbol_kind != GDB_INDEX_SYMBOL_KIND_OTHER)
4061 static struct compunit_symtab *
4062 dw2_lookup_symbol (struct objfile *objfile, int block_index,
4063 const char *name, domain_enum domain)
4065 struct compunit_symtab *stab_best = NULL;
4066 struct dwarf2_per_objfile *dwarf2_per_objfile
4067 = get_dwarf2_per_objfile (objfile);
4069 lookup_name_info lookup_name (name, symbol_name_match_type::FULL);
4071 struct dw2_symtab_iterator iter;
4072 struct dwarf2_per_cu_data *per_cu;
4074 dw2_symtab_iter_init (&iter, dwarf2_per_objfile, 1, block_index, domain, name);
4076 while ((per_cu = dw2_symtab_iter_next (&iter)) != NULL)
4078 struct symbol *sym, *with_opaque = NULL;
4079 struct compunit_symtab *stab = dw2_instantiate_symtab (per_cu, false);
4080 const struct blockvector *bv = COMPUNIT_BLOCKVECTOR (stab);
4081 const struct block *block = BLOCKVECTOR_BLOCK (bv, block_index);
4083 sym = block_find_symbol (block, name, domain,
4084 block_find_non_opaque_type_preferred,
4087 /* Some caution must be observed with overloaded functions
4088 and methods, since the index will not contain any overload
4089 information (but NAME might contain it). */
4092 && SYMBOL_MATCHES_SEARCH_NAME (sym, lookup_name))
4094 if (with_opaque != NULL
4095 && SYMBOL_MATCHES_SEARCH_NAME (with_opaque, lookup_name))
4098 /* Keep looking through other CUs. */
4105 dw2_print_stats (struct objfile *objfile)
4107 struct dwarf2_per_objfile *dwarf2_per_objfile
4108 = get_dwarf2_per_objfile (objfile);
4109 int total = (dwarf2_per_objfile->all_comp_units.size ()
4110 + dwarf2_per_objfile->all_type_units.size ());
4113 for (int i = 0; i < total; ++i)
4115 dwarf2_per_cu_data *per_cu = dwarf2_per_objfile->get_cutu (i);
4117 if (!per_cu->v.quick->compunit_symtab)
4120 printf_filtered (_(" Number of read CUs: %d\n"), total - count);
4121 printf_filtered (_(" Number of unread CUs: %d\n"), count);
4124 /* This dumps minimal information about the index.
4125 It is called via "mt print objfiles".
4126 One use is to verify .gdb_index has been loaded by the
4127 gdb.dwarf2/gdb-index.exp testcase. */
4130 dw2_dump (struct objfile *objfile)
4132 struct dwarf2_per_objfile *dwarf2_per_objfile
4133 = get_dwarf2_per_objfile (objfile);
4135 gdb_assert (dwarf2_per_objfile->using_index);
4136 printf_filtered (".gdb_index:");
4137 if (dwarf2_per_objfile->index_table != NULL)
4139 printf_filtered (" version %d\n",
4140 dwarf2_per_objfile->index_table->version);
4143 printf_filtered (" faked for \"readnow\"\n");
4144 printf_filtered ("\n");
4148 dw2_expand_symtabs_for_function (struct objfile *objfile,
4149 const char *func_name)
4151 struct dwarf2_per_objfile *dwarf2_per_objfile
4152 = get_dwarf2_per_objfile (objfile);
4154 struct dw2_symtab_iterator iter;
4155 struct dwarf2_per_cu_data *per_cu;
4157 /* Note: It doesn't matter what we pass for block_index here. */
4158 dw2_symtab_iter_init (&iter, dwarf2_per_objfile, 0, GLOBAL_BLOCK, VAR_DOMAIN,
4161 while ((per_cu = dw2_symtab_iter_next (&iter)) != NULL)
4162 dw2_instantiate_symtab (per_cu, false);
4167 dw2_expand_all_symtabs (struct objfile *objfile)
4169 struct dwarf2_per_objfile *dwarf2_per_objfile
4170 = get_dwarf2_per_objfile (objfile);
4171 int total_units = (dwarf2_per_objfile->all_comp_units.size ()
4172 + dwarf2_per_objfile->all_type_units.size ());
4174 for (int i = 0; i < total_units; ++i)
4176 dwarf2_per_cu_data *per_cu = dwarf2_per_objfile->get_cutu (i);
4178 /* We don't want to directly expand a partial CU, because if we
4179 read it with the wrong language, then assertion failures can
4180 be triggered later on. See PR symtab/23010. So, tell
4181 dw2_instantiate_symtab to skip partial CUs -- any important
4182 partial CU will be read via DW_TAG_imported_unit anyway. */
4183 dw2_instantiate_symtab (per_cu, true);
4188 dw2_expand_symtabs_with_fullname (struct objfile *objfile,
4189 const char *fullname)
4191 struct dwarf2_per_objfile *dwarf2_per_objfile
4192 = get_dwarf2_per_objfile (objfile);
4194 /* We don't need to consider type units here.
4195 This is only called for examining code, e.g. expand_line_sal.
4196 There can be an order of magnitude (or more) more type units
4197 than comp units, and we avoid them if we can. */
4199 for (dwarf2_per_cu_data *per_cu : dwarf2_per_objfile->all_comp_units)
4201 /* We only need to look at symtabs not already expanded. */
4202 if (per_cu->v.quick->compunit_symtab)
4205 quick_file_names *file_data = dw2_get_file_names (per_cu);
4206 if (file_data == NULL)
4209 for (int j = 0; j < file_data->num_file_names; ++j)
4211 const char *this_fullname = file_data->file_names[j];
4213 if (filename_cmp (this_fullname, fullname) == 0)
4215 dw2_instantiate_symtab (per_cu, false);
4223 dw2_map_matching_symbols (struct objfile *objfile,
4224 const char * name, domain_enum domain,
4226 int (*callback) (const struct block *,
4227 struct symbol *, void *),
4228 void *data, symbol_name_match_type match,
4229 symbol_compare_ftype *ordered_compare)
4231 /* Currently unimplemented; used for Ada. The function can be called if the
4232 current language is Ada for a non-Ada objfile using GNU index. As Ada
4233 does not look for non-Ada symbols this function should just return. */
4236 /* Symbol name matcher for .gdb_index names.
4238 Symbol names in .gdb_index have a few particularities:
4240 - There's no indication of which is the language of each symbol.
4242 Since each language has its own symbol name matching algorithm,
4243 and we don't know which language is the right one, we must match
4244 each symbol against all languages. This would be a potential
4245 performance problem if it were not mitigated by the
4246 mapped_index::name_components lookup table, which significantly
4247 reduces the number of times we need to call into this matcher,
4248 making it a non-issue.
4250 - Symbol names in the index have no overload (parameter)
4251 information. I.e., in C++, "foo(int)" and "foo(long)" both
4252 appear as "foo" in the index, for example.
4254 This means that the lookup names passed to the symbol name
4255 matcher functions must have no parameter information either
4256 because (e.g.) symbol search name "foo" does not match
4257 lookup-name "foo(int)" [while swapping search name for lookup
4260 class gdb_index_symbol_name_matcher
4263 /* Prepares the vector of comparison functions for LOOKUP_NAME. */
4264 gdb_index_symbol_name_matcher (const lookup_name_info &lookup_name);
4266 /* Walk all the matcher routines and match SYMBOL_NAME against them.
4267 Returns true if any matcher matches. */
4268 bool matches (const char *symbol_name);
4271 /* A reference to the lookup name we're matching against. */
4272 const lookup_name_info &m_lookup_name;
4274 /* A vector holding all the different symbol name matchers, for all
4276 std::vector<symbol_name_matcher_ftype *> m_symbol_name_matcher_funcs;
4279 gdb_index_symbol_name_matcher::gdb_index_symbol_name_matcher
4280 (const lookup_name_info &lookup_name)
4281 : m_lookup_name (lookup_name)
4283 /* Prepare the vector of comparison functions upfront, to avoid
4284 doing the same work for each symbol. Care is taken to avoid
4285 matching with the same matcher more than once if/when multiple
4286 languages use the same matcher function. */
4287 auto &matchers = m_symbol_name_matcher_funcs;
4288 matchers.reserve (nr_languages);
4290 matchers.push_back (default_symbol_name_matcher);
4292 for (int i = 0; i < nr_languages; i++)
4294 const language_defn *lang = language_def ((enum language) i);
4295 symbol_name_matcher_ftype *name_matcher
4296 = get_symbol_name_matcher (lang, m_lookup_name);
4298 /* Don't insert the same comparison routine more than once.
4299 Note that we do this linear walk instead of a seemingly
4300 cheaper sorted insert, or use a std::set or something like
4301 that, because relative order of function addresses is not
4302 stable. This is not a problem in practice because the number
4303 of supported languages is low, and the cost here is tiny
4304 compared to the number of searches we'll do afterwards using
4306 if (name_matcher != default_symbol_name_matcher
4307 && (std::find (matchers.begin (), matchers.end (), name_matcher)
4308 == matchers.end ()))
4309 matchers.push_back (name_matcher);
4314 gdb_index_symbol_name_matcher::matches (const char *symbol_name)
4316 for (auto matches_name : m_symbol_name_matcher_funcs)
4317 if (matches_name (symbol_name, m_lookup_name, NULL))
4323 /* Starting from a search name, return the string that finds the upper
4324 bound of all strings that start with SEARCH_NAME in a sorted name
4325 list. Returns the empty string to indicate that the upper bound is
4326 the end of the list. */
4329 make_sort_after_prefix_name (const char *search_name)
4331 /* When looking to complete "func", we find the upper bound of all
4332 symbols that start with "func" by looking for where we'd insert
4333 the closest string that would follow "func" in lexicographical
4334 order. Usually, that's "func"-with-last-character-incremented,
4335 i.e. "fund". Mind non-ASCII characters, though. Usually those
4336 will be UTF-8 multi-byte sequences, but we can't be certain.
4337 Especially mind the 0xff character, which is a valid character in
4338 non-UTF-8 source character sets (e.g. Latin1 'ÿ'), and we can't
4339 rule out compilers allowing it in identifiers. Note that
4340 conveniently, strcmp/strcasecmp are specified to compare
4341 characters interpreted as unsigned char. So what we do is treat
4342 the whole string as a base 256 number composed of a sequence of
4343 base 256 "digits" and add 1 to it. I.e., adding 1 to 0xff wraps
4344 to 0, and carries 1 to the following more-significant position.
4345 If the very first character in SEARCH_NAME ends up incremented
4346 and carries/overflows, then the upper bound is the end of the
4347 list. The string after the empty string is also the empty
4350 Some examples of this operation:
4352 SEARCH_NAME => "+1" RESULT
4356 "\xff" "a" "\xff" => "\xff" "b"
4361 Then, with these symbols for example:
4367 completing "func" looks for symbols between "func" and
4368 "func"-with-last-character-incremented, i.e. "fund" (exclusive),
4369 which finds "func" and "func1", but not "fund".
4373 funcÿ (Latin1 'ÿ' [0xff])
4377 completing "funcÿ" looks for symbols between "funcÿ" and "fund"
4378 (exclusive), which finds "funcÿ" and "funcÿ1", but not "fund".
4382 ÿÿ (Latin1 'ÿ' [0xff])
4385 completing "ÿ" or "ÿÿ" looks for symbols between between "ÿÿ" and
4386 the end of the list.
4388 std::string after = search_name;
4389 while (!after.empty () && (unsigned char) after.back () == 0xff)
4391 if (!after.empty ())
4392 after.back () = (unsigned char) after.back () + 1;
4396 /* See declaration. */
4398 std::pair<std::vector<name_component>::const_iterator,
4399 std::vector<name_component>::const_iterator>
4400 mapped_index_base::find_name_components_bounds
4401 (const lookup_name_info &lookup_name_without_params) const
4404 = this->name_components_casing == case_sensitive_on ? strcmp : strcasecmp;
4407 = lookup_name_without_params.cplus ().lookup_name ().c_str ();
4409 /* Comparison function object for lower_bound that matches against a
4410 given symbol name. */
4411 auto lookup_compare_lower = [&] (const name_component &elem,
4414 const char *elem_qualified = this->symbol_name_at (elem.idx);
4415 const char *elem_name = elem_qualified + elem.name_offset;
4416 return name_cmp (elem_name, name) < 0;
4419 /* Comparison function object for upper_bound that matches against a
4420 given symbol name. */
4421 auto lookup_compare_upper = [&] (const char *name,
4422 const name_component &elem)
4424 const char *elem_qualified = this->symbol_name_at (elem.idx);
4425 const char *elem_name = elem_qualified + elem.name_offset;
4426 return name_cmp (name, elem_name) < 0;
4429 auto begin = this->name_components.begin ();
4430 auto end = this->name_components.end ();
4432 /* Find the lower bound. */
4435 if (lookup_name_without_params.completion_mode () && cplus[0] == '\0')
4438 return std::lower_bound (begin, end, cplus, lookup_compare_lower);
4441 /* Find the upper bound. */
4444 if (lookup_name_without_params.completion_mode ())
4446 /* In completion mode, we want UPPER to point past all
4447 symbols names that have the same prefix. I.e., with
4448 these symbols, and completing "func":
4450 function << lower bound
4452 other_function << upper bound
4454 We find the upper bound by looking for the insertion
4455 point of "func"-with-last-character-incremented,
4457 std::string after = make_sort_after_prefix_name (cplus);
4460 return std::lower_bound (lower, end, after.c_str (),
4461 lookup_compare_lower);
4464 return std::upper_bound (lower, end, cplus, lookup_compare_upper);
4467 return {lower, upper};
4470 /* See declaration. */
4473 mapped_index_base::build_name_components ()
4475 if (!this->name_components.empty ())
4478 this->name_components_casing = case_sensitivity;
4480 = this->name_components_casing == case_sensitive_on ? strcmp : strcasecmp;
4482 /* The code below only knows how to break apart components of C++
4483 symbol names (and other languages that use '::' as
4484 namespace/module separator). If we add support for wild matching
4485 to some language that uses some other operator (E.g., Ada, Go and
4486 D use '.'), then we'll need to try splitting the symbol name
4487 according to that language too. Note that Ada does support wild
4488 matching, but doesn't currently support .gdb_index. */
4489 auto count = this->symbol_name_count ();
4490 for (offset_type idx = 0; idx < count; idx++)
4492 if (this->symbol_name_slot_invalid (idx))
4495 const char *name = this->symbol_name_at (idx);
4497 /* Add each name component to the name component table. */
4498 unsigned int previous_len = 0;
4499 for (unsigned int current_len = cp_find_first_component (name);
4500 name[current_len] != '\0';
4501 current_len += cp_find_first_component (name + current_len))
4503 gdb_assert (name[current_len] == ':');
4504 this->name_components.push_back ({previous_len, idx});
4505 /* Skip the '::'. */
4507 previous_len = current_len;
4509 this->name_components.push_back ({previous_len, idx});
4512 /* Sort name_components elements by name. */
4513 auto name_comp_compare = [&] (const name_component &left,
4514 const name_component &right)
4516 const char *left_qualified = this->symbol_name_at (left.idx);
4517 const char *right_qualified = this->symbol_name_at (right.idx);
4519 const char *left_name = left_qualified + left.name_offset;
4520 const char *right_name = right_qualified + right.name_offset;
4522 return name_cmp (left_name, right_name) < 0;
4525 std::sort (this->name_components.begin (),
4526 this->name_components.end (),
4530 /* Helper for dw2_expand_symtabs_matching that works with a
4531 mapped_index_base instead of the containing objfile. This is split
4532 to a separate function in order to be able to unit test the
4533 name_components matching using a mock mapped_index_base. For each
4534 symbol name that matches, calls MATCH_CALLBACK, passing it the
4535 symbol's index in the mapped_index_base symbol table. */
4538 dw2_expand_symtabs_matching_symbol
4539 (mapped_index_base &index,
4540 const lookup_name_info &lookup_name_in,
4541 gdb::function_view<expand_symtabs_symbol_matcher_ftype> symbol_matcher,
4542 enum search_domain kind,
4543 gdb::function_view<void (offset_type)> match_callback)
4545 lookup_name_info lookup_name_without_params
4546 = lookup_name_in.make_ignore_params ();
4547 gdb_index_symbol_name_matcher lookup_name_matcher
4548 (lookup_name_without_params);
4550 /* Build the symbol name component sorted vector, if we haven't
4552 index.build_name_components ();
4554 auto bounds = index.find_name_components_bounds (lookup_name_without_params);
4556 /* Now for each symbol name in range, check to see if we have a name
4557 match, and if so, call the MATCH_CALLBACK callback. */
4559 /* The same symbol may appear more than once in the range though.
4560 E.g., if we're looking for symbols that complete "w", and we have
4561 a symbol named "w1::w2", we'll find the two name components for
4562 that same symbol in the range. To be sure we only call the
4563 callback once per symbol, we first collect the symbol name
4564 indexes that matched in a temporary vector and ignore
4566 std::vector<offset_type> matches;
4567 matches.reserve (std::distance (bounds.first, bounds.second));
4569 for (; bounds.first != bounds.second; ++bounds.first)
4571 const char *qualified = index.symbol_name_at (bounds.first->idx);
4573 if (!lookup_name_matcher.matches (qualified)
4574 || (symbol_matcher != NULL && !symbol_matcher (qualified)))
4577 matches.push_back (bounds.first->idx);
4580 std::sort (matches.begin (), matches.end ());
4582 /* Finally call the callback, once per match. */
4584 for (offset_type idx : matches)
4588 match_callback (idx);
4593 /* Above we use a type wider than idx's for 'prev', since 0 and
4594 (offset_type)-1 are both possible values. */
4595 static_assert (sizeof (prev) > sizeof (offset_type), "");
4600 namespace selftests { namespace dw2_expand_symtabs_matching {
4602 /* A mock .gdb_index/.debug_names-like name index table, enough to
4603 exercise dw2_expand_symtabs_matching_symbol, which works with the
4604 mapped_index_base interface. Builds an index from the symbol list
4605 passed as parameter to the constructor. */
4606 class mock_mapped_index : public mapped_index_base
4609 mock_mapped_index (gdb::array_view<const char *> symbols)
4610 : m_symbol_table (symbols)
4613 DISABLE_COPY_AND_ASSIGN (mock_mapped_index);
4615 /* Return the number of names in the symbol table. */
4616 size_t symbol_name_count () const override
4618 return m_symbol_table.size ();
4621 /* Get the name of the symbol at IDX in the symbol table. */
4622 const char *symbol_name_at (offset_type idx) const override
4624 return m_symbol_table[idx];
4628 gdb::array_view<const char *> m_symbol_table;
4631 /* Convenience function that converts a NULL pointer to a "<null>"
4632 string, to pass to print routines. */
4635 string_or_null (const char *str)
4637 return str != NULL ? str : "<null>";
4640 /* Check if a lookup_name_info built from
4641 NAME/MATCH_TYPE/COMPLETION_MODE matches the symbols in the mock
4642 index. EXPECTED_LIST is the list of expected matches, in expected
4643 matching order. If no match expected, then an empty list is
4644 specified. Returns true on success. On failure prints a warning
4645 indicating the file:line that failed, and returns false. */
4648 check_match (const char *file, int line,
4649 mock_mapped_index &mock_index,
4650 const char *name, symbol_name_match_type match_type,
4651 bool completion_mode,
4652 std::initializer_list<const char *> expected_list)
4654 lookup_name_info lookup_name (name, match_type, completion_mode);
4656 bool matched = true;
4658 auto mismatch = [&] (const char *expected_str,
4661 warning (_("%s:%d: match_type=%s, looking-for=\"%s\", "
4662 "expected=\"%s\", got=\"%s\"\n"),
4664 (match_type == symbol_name_match_type::FULL
4666 name, string_or_null (expected_str), string_or_null (got));
4670 auto expected_it = expected_list.begin ();
4671 auto expected_end = expected_list.end ();
4673 dw2_expand_symtabs_matching_symbol (mock_index, lookup_name,
4675 [&] (offset_type idx)
4677 const char *matched_name = mock_index.symbol_name_at (idx);
4678 const char *expected_str
4679 = expected_it == expected_end ? NULL : *expected_it++;
4681 if (expected_str == NULL || strcmp (expected_str, matched_name) != 0)
4682 mismatch (expected_str, matched_name);
4685 const char *expected_str
4686 = expected_it == expected_end ? NULL : *expected_it++;
4687 if (expected_str != NULL)
4688 mismatch (expected_str, NULL);
4693 /* The symbols added to the mock mapped_index for testing (in
4695 static const char *test_symbols[] = {
4704 "ns2::tmpl<int>::foo2",
4705 "(anonymous namespace)::A::B::C",
4707 /* These are used to check that the increment-last-char in the
4708 matching algorithm for completion doesn't match "t1_fund" when
4709 completing "t1_func". */
4715 /* A UTF-8 name with multi-byte sequences to make sure that
4716 cp-name-parser understands this as a single identifier ("função"
4717 is "function" in PT). */
4720 /* \377 (0xff) is Latin1 'ÿ'. */
4723 /* \377 (0xff) is Latin1 'ÿ'. */
4727 /* A name with all sorts of complications. Starts with "z" to make
4728 it easier for the completion tests below. */
4729 #define Z_SYM_NAME \
4730 "z::std::tuple<(anonymous namespace)::ui*, std::bar<(anonymous namespace)::ui> >" \
4731 "::tuple<(anonymous namespace)::ui*, " \
4732 "std::default_delete<(anonymous namespace)::ui>, void>"
4737 /* Returns true if the mapped_index_base::find_name_component_bounds
4738 method finds EXPECTED_SYMS in INDEX when looking for SEARCH_NAME,
4739 in completion mode. */
4742 check_find_bounds_finds (mapped_index_base &index,
4743 const char *search_name,
4744 gdb::array_view<const char *> expected_syms)
4746 lookup_name_info lookup_name (search_name,
4747 symbol_name_match_type::FULL, true);
4749 auto bounds = index.find_name_components_bounds (lookup_name);
4751 size_t distance = std::distance (bounds.first, bounds.second);
4752 if (distance != expected_syms.size ())
4755 for (size_t exp_elem = 0; exp_elem < distance; exp_elem++)
4757 auto nc_elem = bounds.first + exp_elem;
4758 const char *qualified = index.symbol_name_at (nc_elem->idx);
4759 if (strcmp (qualified, expected_syms[exp_elem]) != 0)
4766 /* Test the lower-level mapped_index::find_name_component_bounds
4770 test_mapped_index_find_name_component_bounds ()
4772 mock_mapped_index mock_index (test_symbols);
4774 mock_index.build_name_components ();
4776 /* Test the lower-level mapped_index::find_name_component_bounds
4777 method in completion mode. */
4779 static const char *expected_syms[] = {
4784 SELF_CHECK (check_find_bounds_finds (mock_index,
4785 "t1_func", expected_syms));
4788 /* Check that the increment-last-char in the name matching algorithm
4789 for completion doesn't get confused with Ansi1 'ÿ' / 0xff. */
4791 static const char *expected_syms1[] = {
4795 SELF_CHECK (check_find_bounds_finds (mock_index,
4796 "\377", expected_syms1));
4798 static const char *expected_syms2[] = {
4801 SELF_CHECK (check_find_bounds_finds (mock_index,
4802 "\377\377", expected_syms2));
4806 /* Test dw2_expand_symtabs_matching_symbol. */
4809 test_dw2_expand_symtabs_matching_symbol ()
4811 mock_mapped_index mock_index (test_symbols);
4813 /* We let all tests run until the end even if some fails, for debug
4815 bool any_mismatch = false;
4817 /* Create the expected symbols list (an initializer_list). Needed
4818 because lists have commas, and we need to pass them to CHECK,
4819 which is a macro. */
4820 #define EXPECT(...) { __VA_ARGS__ }
4822 /* Wrapper for check_match that passes down the current
4823 __FILE__/__LINE__. */
4824 #define CHECK_MATCH(NAME, MATCH_TYPE, COMPLETION_MODE, EXPECTED_LIST) \
4825 any_mismatch |= !check_match (__FILE__, __LINE__, \
4827 NAME, MATCH_TYPE, COMPLETION_MODE, \
4830 /* Identity checks. */
4831 for (const char *sym : test_symbols)
4833 /* Should be able to match all existing symbols. */
4834 CHECK_MATCH (sym, symbol_name_match_type::FULL, false,
4837 /* Should be able to match all existing symbols with
4839 std::string with_params = std::string (sym) + "(int)";
4840 CHECK_MATCH (with_params.c_str (), symbol_name_match_type::FULL, false,
4843 /* Should be able to match all existing symbols with
4844 parameters and qualifiers. */
4845 with_params = std::string (sym) + " ( int ) const";
4846 CHECK_MATCH (with_params.c_str (), symbol_name_match_type::FULL, false,
4849 /* This should really find sym, but cp-name-parser.y doesn't
4850 know about lvalue/rvalue qualifiers yet. */
4851 with_params = std::string (sym) + " ( int ) &&";
4852 CHECK_MATCH (with_params.c_str (), symbol_name_match_type::FULL, false,
4856 /* Check that the name matching algorithm for completion doesn't get
4857 confused with Latin1 'ÿ' / 0xff. */
4859 static const char str[] = "\377";
4860 CHECK_MATCH (str, symbol_name_match_type::FULL, true,
4861 EXPECT ("\377", "\377\377123"));
4864 /* Check that the increment-last-char in the matching algorithm for
4865 completion doesn't match "t1_fund" when completing "t1_func". */
4867 static const char str[] = "t1_func";
4868 CHECK_MATCH (str, symbol_name_match_type::FULL, true,
4869 EXPECT ("t1_func", "t1_func1"));
4872 /* Check that completion mode works at each prefix of the expected
4875 static const char str[] = "function(int)";
4876 size_t len = strlen (str);
4879 for (size_t i = 1; i < len; i++)
4881 lookup.assign (str, i);
4882 CHECK_MATCH (lookup.c_str (), symbol_name_match_type::FULL, true,
4883 EXPECT ("function"));
4887 /* While "w" is a prefix of both components, the match function
4888 should still only be called once. */
4890 CHECK_MATCH ("w", symbol_name_match_type::FULL, true,
4892 CHECK_MATCH ("w", symbol_name_match_type::WILD, true,
4896 /* Same, with a "complicated" symbol. */
4898 static const char str[] = Z_SYM_NAME;
4899 size_t len = strlen (str);
4902 for (size_t i = 1; i < len; i++)
4904 lookup.assign (str, i);
4905 CHECK_MATCH (lookup.c_str (), symbol_name_match_type::FULL, true,
4906 EXPECT (Z_SYM_NAME));
4910 /* In FULL mode, an incomplete symbol doesn't match. */
4912 CHECK_MATCH ("std::zfunction(int", symbol_name_match_type::FULL, false,
4916 /* A complete symbol with parameters matches any overload, since the
4917 index has no overload info. */
4919 CHECK_MATCH ("std::zfunction(int)", symbol_name_match_type::FULL, true,
4920 EXPECT ("std::zfunction", "std::zfunction2"));
4921 CHECK_MATCH ("zfunction(int)", symbol_name_match_type::WILD, true,
4922 EXPECT ("std::zfunction", "std::zfunction2"));
4923 CHECK_MATCH ("zfunc", symbol_name_match_type::WILD, true,
4924 EXPECT ("std::zfunction", "std::zfunction2"));
4927 /* Check that whitespace is ignored appropriately. A symbol with a
4928 template argument list. */
4930 static const char expected[] = "ns::foo<int>";
4931 CHECK_MATCH ("ns :: foo < int > ", symbol_name_match_type::FULL, false,
4933 CHECK_MATCH ("foo < int > ", symbol_name_match_type::WILD, false,
4937 /* Check that whitespace is ignored appropriately. A symbol with a
4938 template argument list that includes a pointer. */
4940 static const char expected[] = "ns::foo<char*>";
4941 /* Try both completion and non-completion modes. */
4942 static const bool completion_mode[2] = {false, true};
4943 for (size_t i = 0; i < 2; i++)
4945 CHECK_MATCH ("ns :: foo < char * >", symbol_name_match_type::FULL,
4946 completion_mode[i], EXPECT (expected));
4947 CHECK_MATCH ("foo < char * >", symbol_name_match_type::WILD,
4948 completion_mode[i], EXPECT (expected));
4950 CHECK_MATCH ("ns :: foo < char * > (int)", symbol_name_match_type::FULL,
4951 completion_mode[i], EXPECT (expected));
4952 CHECK_MATCH ("foo < char * > (int)", symbol_name_match_type::WILD,
4953 completion_mode[i], EXPECT (expected));
4958 /* Check method qualifiers are ignored. */
4959 static const char expected[] = "ns::foo<char*>";
4960 CHECK_MATCH ("ns :: foo < char * > ( int ) const",
4961 symbol_name_match_type::FULL, true, EXPECT (expected));
4962 CHECK_MATCH ("ns :: foo < char * > ( int ) &&",
4963 symbol_name_match_type::FULL, true, EXPECT (expected));
4964 CHECK_MATCH ("foo < char * > ( int ) const",
4965 symbol_name_match_type::WILD, true, EXPECT (expected));
4966 CHECK_MATCH ("foo < char * > ( int ) &&",
4967 symbol_name_match_type::WILD, true, EXPECT (expected));
4970 /* Test lookup names that don't match anything. */
4972 CHECK_MATCH ("bar2", symbol_name_match_type::WILD, false,
4975 CHECK_MATCH ("doesntexist", symbol_name_match_type::FULL, false,
4979 /* Some wild matching tests, exercising "(anonymous namespace)",
4980 which should not be confused with a parameter list. */
4982 static const char *syms[] = {
4986 "A :: B :: C ( int )",
4991 for (const char *s : syms)
4993 CHECK_MATCH (s, symbol_name_match_type::WILD, false,
4994 EXPECT ("(anonymous namespace)::A::B::C"));
4999 static const char expected[] = "ns2::tmpl<int>::foo2";
5000 CHECK_MATCH ("tmp", symbol_name_match_type::WILD, true,
5002 CHECK_MATCH ("tmpl<", symbol_name_match_type::WILD, true,
5006 SELF_CHECK (!any_mismatch);
5015 test_mapped_index_find_name_component_bounds ();
5016 test_dw2_expand_symtabs_matching_symbol ();
5019 }} // namespace selftests::dw2_expand_symtabs_matching
5021 #endif /* GDB_SELF_TEST */
5023 /* If FILE_MATCHER is NULL or if PER_CU has
5024 dwarf2_per_cu_quick_data::MARK set (see
5025 dw_expand_symtabs_matching_file_matcher), expand the CU and call
5026 EXPANSION_NOTIFY on it. */
5029 dw2_expand_symtabs_matching_one
5030 (struct dwarf2_per_cu_data *per_cu,
5031 gdb::function_view<expand_symtabs_file_matcher_ftype> file_matcher,
5032 gdb::function_view<expand_symtabs_exp_notify_ftype> expansion_notify)
5034 if (file_matcher == NULL || per_cu->v.quick->mark)
5036 bool symtab_was_null
5037 = (per_cu->v.quick->compunit_symtab == NULL);
5039 dw2_instantiate_symtab (per_cu, false);
5041 if (expansion_notify != NULL
5043 && per_cu->v.quick->compunit_symtab != NULL)
5044 expansion_notify (per_cu->v.quick->compunit_symtab);
5048 /* Helper for dw2_expand_matching symtabs. Called on each symbol
5049 matched, to expand corresponding CUs that were marked. IDX is the
5050 index of the symbol name that matched. */
5053 dw2_expand_marked_cus
5054 (struct dwarf2_per_objfile *dwarf2_per_objfile, offset_type idx,
5055 gdb::function_view<expand_symtabs_file_matcher_ftype> file_matcher,
5056 gdb::function_view<expand_symtabs_exp_notify_ftype> expansion_notify,
5059 offset_type *vec, vec_len, vec_idx;
5060 bool global_seen = false;
5061 mapped_index &index = *dwarf2_per_objfile->index_table;
5063 vec = (offset_type *) (index.constant_pool
5064 + MAYBE_SWAP (index.symbol_table[idx].vec));
5065 vec_len = MAYBE_SWAP (vec[0]);
5066 for (vec_idx = 0; vec_idx < vec_len; ++vec_idx)
5068 offset_type cu_index_and_attrs = MAYBE_SWAP (vec[vec_idx + 1]);
5069 /* This value is only valid for index versions >= 7. */
5070 int is_static = GDB_INDEX_SYMBOL_STATIC_VALUE (cu_index_and_attrs);
5071 gdb_index_symbol_kind symbol_kind =
5072 GDB_INDEX_SYMBOL_KIND_VALUE (cu_index_and_attrs);
5073 int cu_index = GDB_INDEX_CU_VALUE (cu_index_and_attrs);
5074 /* Only check the symbol attributes if they're present.
5075 Indices prior to version 7 don't record them,
5076 and indices >= 7 may elide them for certain symbols
5077 (gold does this). */
5080 && symbol_kind != GDB_INDEX_SYMBOL_KIND_NONE);
5082 /* Work around gold/15646. */
5085 if (!is_static && global_seen)
5091 /* Only check the symbol's kind if it has one. */
5096 case VARIABLES_DOMAIN:
5097 if (symbol_kind != GDB_INDEX_SYMBOL_KIND_VARIABLE)
5100 case FUNCTIONS_DOMAIN:
5101 if (symbol_kind != GDB_INDEX_SYMBOL_KIND_FUNCTION)
5105 if (symbol_kind != GDB_INDEX_SYMBOL_KIND_TYPE)
5113 /* Don't crash on bad data. */
5114 if (cu_index >= (dwarf2_per_objfile->all_comp_units.size ()
5115 + dwarf2_per_objfile->all_type_units.size ()))
5117 complaint (_(".gdb_index entry has bad CU index"
5119 objfile_name (dwarf2_per_objfile->objfile));
5123 dwarf2_per_cu_data *per_cu = dwarf2_per_objfile->get_cutu (cu_index);
5124 dw2_expand_symtabs_matching_one (per_cu, file_matcher,
5129 /* If FILE_MATCHER is non-NULL, set all the
5130 dwarf2_per_cu_quick_data::MARK of the current DWARF2_PER_OBJFILE
5131 that match FILE_MATCHER. */
5134 dw_expand_symtabs_matching_file_matcher
5135 (struct dwarf2_per_objfile *dwarf2_per_objfile,
5136 gdb::function_view<expand_symtabs_file_matcher_ftype> file_matcher)
5138 if (file_matcher == NULL)
5141 objfile *const objfile = dwarf2_per_objfile->objfile;
5143 htab_up visited_found (htab_create_alloc (10, htab_hash_pointer,
5145 NULL, xcalloc, xfree));
5146 htab_up visited_not_found (htab_create_alloc (10, htab_hash_pointer,
5148 NULL, xcalloc, xfree));
5150 /* The rule is CUs specify all the files, including those used by
5151 any TU, so there's no need to scan TUs here. */
5153 for (dwarf2_per_cu_data *per_cu : dwarf2_per_objfile->all_comp_units)
5157 per_cu->v.quick->mark = 0;
5159 /* We only need to look at symtabs not already expanded. */
5160 if (per_cu->v.quick->compunit_symtab)
5163 quick_file_names *file_data = dw2_get_file_names (per_cu);
5164 if (file_data == NULL)
5167 if (htab_find (visited_not_found.get (), file_data) != NULL)
5169 else if (htab_find (visited_found.get (), file_data) != NULL)
5171 per_cu->v.quick->mark = 1;
5175 for (int j = 0; j < file_data->num_file_names; ++j)
5177 const char *this_real_name;
5179 if (file_matcher (file_data->file_names[j], false))
5181 per_cu->v.quick->mark = 1;
5185 /* Before we invoke realpath, which can get expensive when many
5186 files are involved, do a quick comparison of the basenames. */
5187 if (!basenames_may_differ
5188 && !file_matcher (lbasename (file_data->file_names[j]),
5192 this_real_name = dw2_get_real_path (objfile, file_data, j);
5193 if (file_matcher (this_real_name, false))
5195 per_cu->v.quick->mark = 1;
5200 void **slot = htab_find_slot (per_cu->v.quick->mark
5201 ? visited_found.get ()
5202 : visited_not_found.get (),
5209 dw2_expand_symtabs_matching
5210 (struct objfile *objfile,
5211 gdb::function_view<expand_symtabs_file_matcher_ftype> file_matcher,
5212 const lookup_name_info &lookup_name,
5213 gdb::function_view<expand_symtabs_symbol_matcher_ftype> symbol_matcher,
5214 gdb::function_view<expand_symtabs_exp_notify_ftype> expansion_notify,
5215 enum search_domain kind)
5217 struct dwarf2_per_objfile *dwarf2_per_objfile
5218 = get_dwarf2_per_objfile (objfile);
5220 /* index_table is NULL if OBJF_READNOW. */
5221 if (!dwarf2_per_objfile->index_table)
5224 dw_expand_symtabs_matching_file_matcher (dwarf2_per_objfile, file_matcher);
5226 mapped_index &index = *dwarf2_per_objfile->index_table;
5228 dw2_expand_symtabs_matching_symbol (index, lookup_name,
5230 kind, [&] (offset_type idx)
5232 dw2_expand_marked_cus (dwarf2_per_objfile, idx, file_matcher,
5233 expansion_notify, kind);
5237 /* A helper for dw2_find_pc_sect_compunit_symtab which finds the most specific
5240 static struct compunit_symtab *
5241 recursively_find_pc_sect_compunit_symtab (struct compunit_symtab *cust,
5246 if (COMPUNIT_BLOCKVECTOR (cust) != NULL
5247 && blockvector_contains_pc (COMPUNIT_BLOCKVECTOR (cust), pc))
5250 if (cust->includes == NULL)
5253 for (i = 0; cust->includes[i]; ++i)
5255 struct compunit_symtab *s = cust->includes[i];
5257 s = recursively_find_pc_sect_compunit_symtab (s, pc);
5265 static struct compunit_symtab *
5266 dw2_find_pc_sect_compunit_symtab (struct objfile *objfile,
5267 struct bound_minimal_symbol msymbol,
5269 struct obj_section *section,
5272 struct dwarf2_per_cu_data *data;
5273 struct compunit_symtab *result;
5275 if (!objfile->partial_symtabs->psymtabs_addrmap)
5278 CORE_ADDR baseaddr = ANOFFSET (objfile->section_offsets,
5279 SECT_OFF_TEXT (objfile));
5280 data = (struct dwarf2_per_cu_data *) addrmap_find
5281 (objfile->partial_symtabs->psymtabs_addrmap, pc - baseaddr);
5285 if (warn_if_readin && data->v.quick->compunit_symtab)
5286 warning (_("(Internal error: pc %s in read in CU, but not in symtab.)"),
5287 paddress (get_objfile_arch (objfile), pc));
5290 = recursively_find_pc_sect_compunit_symtab (dw2_instantiate_symtab (data,
5293 gdb_assert (result != NULL);
5298 dw2_map_symbol_filenames (struct objfile *objfile, symbol_filename_ftype *fun,
5299 void *data, int need_fullname)
5301 struct dwarf2_per_objfile *dwarf2_per_objfile
5302 = get_dwarf2_per_objfile (objfile);
5304 if (!dwarf2_per_objfile->filenames_cache)
5306 dwarf2_per_objfile->filenames_cache.emplace ();
5308 htab_up visited (htab_create_alloc (10,
5309 htab_hash_pointer, htab_eq_pointer,
5310 NULL, xcalloc, xfree));
5312 /* The rule is CUs specify all the files, including those used
5313 by any TU, so there's no need to scan TUs here. We can
5314 ignore file names coming from already-expanded CUs. */
5316 for (dwarf2_per_cu_data *per_cu : dwarf2_per_objfile->all_comp_units)
5318 if (per_cu->v.quick->compunit_symtab)
5320 void **slot = htab_find_slot (visited.get (),
5321 per_cu->v.quick->file_names,
5324 *slot = per_cu->v.quick->file_names;
5328 for (dwarf2_per_cu_data *per_cu : dwarf2_per_objfile->all_comp_units)
5330 /* We only need to look at symtabs not already expanded. */
5331 if (per_cu->v.quick->compunit_symtab)
5334 quick_file_names *file_data = dw2_get_file_names (per_cu);
5335 if (file_data == NULL)
5338 void **slot = htab_find_slot (visited.get (), file_data, INSERT);
5341 /* Already visited. */
5346 for (int j = 0; j < file_data->num_file_names; ++j)
5348 const char *filename = file_data->file_names[j];
5349 dwarf2_per_objfile->filenames_cache->seen (filename);
5354 dwarf2_per_objfile->filenames_cache->traverse ([&] (const char *filename)
5356 gdb::unique_xmalloc_ptr<char> this_real_name;
5359 this_real_name = gdb_realpath (filename);
5360 (*fun) (filename, this_real_name.get (), data);
5365 dw2_has_symbols (struct objfile *objfile)
5370 const struct quick_symbol_functions dwarf2_gdb_index_functions =
5373 dw2_find_last_source_symtab,
5374 dw2_forget_cached_source_info,
5375 dw2_map_symtabs_matching_filename,
5379 dw2_expand_symtabs_for_function,
5380 dw2_expand_all_symtabs,
5381 dw2_expand_symtabs_with_fullname,
5382 dw2_map_matching_symbols,
5383 dw2_expand_symtabs_matching,
5384 dw2_find_pc_sect_compunit_symtab,
5386 dw2_map_symbol_filenames
5389 /* DWARF-5 debug_names reader. */
5391 /* DWARF-5 augmentation string for GDB's DW_IDX_GNU_* extension. */
5392 static const gdb_byte dwarf5_augmentation[] = { 'G', 'D', 'B', 0 };
5394 /* A helper function that reads the .debug_names section in SECTION
5395 and fills in MAP. FILENAME is the name of the file containing the
5396 section; it is used for error reporting.
5398 Returns true if all went well, false otherwise. */
5401 read_debug_names_from_section (struct objfile *objfile,
5402 const char *filename,
5403 struct dwarf2_section_info *section,
5404 mapped_debug_names &map)
5406 if (dwarf2_section_empty_p (section))
5409 /* Older elfutils strip versions could keep the section in the main
5410 executable while splitting it for the separate debug info file. */
5411 if ((get_section_flags (section) & SEC_HAS_CONTENTS) == 0)
5414 dwarf2_read_section (objfile, section);
5416 map.dwarf5_byte_order = gdbarch_byte_order (get_objfile_arch (objfile));
5418 const gdb_byte *addr = section->buffer;
5420 bfd *const abfd = get_section_bfd_owner (section);
5422 unsigned int bytes_read;
5423 LONGEST length = read_initial_length (abfd, addr, &bytes_read);
5426 map.dwarf5_is_dwarf64 = bytes_read != 4;
5427 map.offset_size = map.dwarf5_is_dwarf64 ? 8 : 4;
5428 if (bytes_read + length != section->size)
5430 /* There may be multiple per-CU indices. */
5431 warning (_("Section .debug_names in %s length %s does not match "
5432 "section length %s, ignoring .debug_names."),
5433 filename, plongest (bytes_read + length),
5434 pulongest (section->size));
5438 /* The version number. */
5439 uint16_t version = read_2_bytes (abfd, addr);
5443 warning (_("Section .debug_names in %s has unsupported version %d, "
5444 "ignoring .debug_names."),
5450 uint16_t padding = read_2_bytes (abfd, addr);
5454 warning (_("Section .debug_names in %s has unsupported padding %d, "
5455 "ignoring .debug_names."),
5460 /* comp_unit_count - The number of CUs in the CU list. */
5461 map.cu_count = read_4_bytes (abfd, addr);
5464 /* local_type_unit_count - The number of TUs in the local TU
5466 map.tu_count = read_4_bytes (abfd, addr);
5469 /* foreign_type_unit_count - The number of TUs in the foreign TU
5471 uint32_t foreign_tu_count = read_4_bytes (abfd, addr);
5473 if (foreign_tu_count != 0)
5475 warning (_("Section .debug_names in %s has unsupported %lu foreign TUs, "
5476 "ignoring .debug_names."),
5477 filename, static_cast<unsigned long> (foreign_tu_count));
5481 /* bucket_count - The number of hash buckets in the hash lookup
5483 map.bucket_count = read_4_bytes (abfd, addr);
5486 /* name_count - The number of unique names in the index. */
5487 map.name_count = read_4_bytes (abfd, addr);
5490 /* abbrev_table_size - The size in bytes of the abbreviations
5492 uint32_t abbrev_table_size = read_4_bytes (abfd, addr);
5495 /* augmentation_string_size - The size in bytes of the augmentation
5496 string. This value is rounded up to a multiple of 4. */
5497 uint32_t augmentation_string_size = read_4_bytes (abfd, addr);
5499 map.augmentation_is_gdb = ((augmentation_string_size
5500 == sizeof (dwarf5_augmentation))
5501 && memcmp (addr, dwarf5_augmentation,
5502 sizeof (dwarf5_augmentation)) == 0);
5503 augmentation_string_size += (-augmentation_string_size) & 3;
5504 addr += augmentation_string_size;
5507 map.cu_table_reordered = addr;
5508 addr += map.cu_count * map.offset_size;
5510 /* List of Local TUs */
5511 map.tu_table_reordered = addr;
5512 addr += map.tu_count * map.offset_size;
5514 /* Hash Lookup Table */
5515 map.bucket_table_reordered = reinterpret_cast<const uint32_t *> (addr);
5516 addr += map.bucket_count * 4;
5517 map.hash_table_reordered = reinterpret_cast<const uint32_t *> (addr);
5518 addr += map.name_count * 4;
5521 map.name_table_string_offs_reordered = addr;
5522 addr += map.name_count * map.offset_size;
5523 map.name_table_entry_offs_reordered = addr;
5524 addr += map.name_count * map.offset_size;
5526 const gdb_byte *abbrev_table_start = addr;
5529 const ULONGEST index_num = read_unsigned_leb128 (abfd, addr, &bytes_read);
5534 const auto insertpair
5535 = map.abbrev_map.emplace (index_num, mapped_debug_names::index_val ());
5536 if (!insertpair.second)
5538 warning (_("Section .debug_names in %s has duplicate index %s, "
5539 "ignoring .debug_names."),
5540 filename, pulongest (index_num));
5543 mapped_debug_names::index_val &indexval = insertpair.first->second;
5544 indexval.dwarf_tag = read_unsigned_leb128 (abfd, addr, &bytes_read);
5549 mapped_debug_names::index_val::attr attr;
5550 attr.dw_idx = read_unsigned_leb128 (abfd, addr, &bytes_read);
5552 attr.form = read_unsigned_leb128 (abfd, addr, &bytes_read);
5554 if (attr.form == DW_FORM_implicit_const)
5556 attr.implicit_const = read_signed_leb128 (abfd, addr,
5560 if (attr.dw_idx == 0 && attr.form == 0)
5562 indexval.attr_vec.push_back (std::move (attr));
5565 if (addr != abbrev_table_start + abbrev_table_size)
5567 warning (_("Section .debug_names in %s has abbreviation_table "
5568 "of size %zu vs. written as %u, ignoring .debug_names."),
5569 filename, addr - abbrev_table_start, abbrev_table_size);
5572 map.entry_pool = addr;
5577 /* A helper for create_cus_from_debug_names that handles the MAP's CU
5581 create_cus_from_debug_names_list (struct dwarf2_per_objfile *dwarf2_per_objfile,
5582 const mapped_debug_names &map,
5583 dwarf2_section_info §ion,
5586 sect_offset sect_off_prev;
5587 for (uint32_t i = 0; i <= map.cu_count; ++i)
5589 sect_offset sect_off_next;
5590 if (i < map.cu_count)
5593 = (sect_offset) (extract_unsigned_integer
5594 (map.cu_table_reordered + i * map.offset_size,
5596 map.dwarf5_byte_order));
5599 sect_off_next = (sect_offset) section.size;
5602 const ULONGEST length = sect_off_next - sect_off_prev;
5603 dwarf2_per_cu_data *per_cu
5604 = create_cu_from_index_list (dwarf2_per_objfile, §ion, is_dwz,
5605 sect_off_prev, length);
5606 dwarf2_per_objfile->all_comp_units.push_back (per_cu);
5608 sect_off_prev = sect_off_next;
5612 /* Read the CU list from the mapped index, and use it to create all
5613 the CU objects for this dwarf2_per_objfile. */
5616 create_cus_from_debug_names (struct dwarf2_per_objfile *dwarf2_per_objfile,
5617 const mapped_debug_names &map,
5618 const mapped_debug_names &dwz_map)
5620 gdb_assert (dwarf2_per_objfile->all_comp_units.empty ());
5621 dwarf2_per_objfile->all_comp_units.reserve (map.cu_count + dwz_map.cu_count);
5623 create_cus_from_debug_names_list (dwarf2_per_objfile, map,
5624 dwarf2_per_objfile->info,
5625 false /* is_dwz */);
5627 if (dwz_map.cu_count == 0)
5630 dwz_file *dwz = dwarf2_get_dwz_file (dwarf2_per_objfile);
5631 create_cus_from_debug_names_list (dwarf2_per_objfile, dwz_map, dwz->info,
5635 /* Read .debug_names. If everything went ok, initialize the "quick"
5636 elements of all the CUs and return true. Otherwise, return false. */
5639 dwarf2_read_debug_names (struct dwarf2_per_objfile *dwarf2_per_objfile)
5641 std::unique_ptr<mapped_debug_names> map
5642 (new mapped_debug_names (dwarf2_per_objfile));
5643 mapped_debug_names dwz_map (dwarf2_per_objfile);
5644 struct objfile *objfile = dwarf2_per_objfile->objfile;
5646 if (!read_debug_names_from_section (objfile, objfile_name (objfile),
5647 &dwarf2_per_objfile->debug_names,
5651 /* Don't use the index if it's empty. */
5652 if (map->name_count == 0)
5655 /* If there is a .dwz file, read it so we can get its CU list as
5657 dwz_file *dwz = dwarf2_get_dwz_file (dwarf2_per_objfile);
5660 if (!read_debug_names_from_section (objfile,
5661 bfd_get_filename (dwz->dwz_bfd),
5662 &dwz->debug_names, dwz_map))
5664 warning (_("could not read '.debug_names' section from %s; skipping"),
5665 bfd_get_filename (dwz->dwz_bfd));
5670 create_cus_from_debug_names (dwarf2_per_objfile, *map, dwz_map);
5672 if (map->tu_count != 0)
5674 /* We can only handle a single .debug_types when we have an
5676 if (VEC_length (dwarf2_section_info_def, dwarf2_per_objfile->types) != 1)
5679 dwarf2_section_info *section = VEC_index (dwarf2_section_info_def,
5680 dwarf2_per_objfile->types, 0);
5682 create_signatured_type_table_from_debug_names
5683 (dwarf2_per_objfile, *map, section, &dwarf2_per_objfile->abbrev);
5686 create_addrmap_from_aranges (dwarf2_per_objfile,
5687 &dwarf2_per_objfile->debug_aranges);
5689 dwarf2_per_objfile->debug_names_table = std::move (map);
5690 dwarf2_per_objfile->using_index = 1;
5691 dwarf2_per_objfile->quick_file_names_table =
5692 create_quick_file_names_table (dwarf2_per_objfile->all_comp_units.size ());
5697 /* Type used to manage iterating over all CUs looking for a symbol for
5700 class dw2_debug_names_iterator
5703 /* If WANT_SPECIFIC_BLOCK is true, only look for symbols in block
5704 BLOCK_INDEX. Otherwise BLOCK_INDEX is ignored. */
5705 dw2_debug_names_iterator (const mapped_debug_names &map,
5706 bool want_specific_block,
5707 block_enum block_index, domain_enum domain,
5709 : m_map (map), m_want_specific_block (want_specific_block),
5710 m_block_index (block_index), m_domain (domain),
5711 m_addr (find_vec_in_debug_names (map, name))
5714 dw2_debug_names_iterator (const mapped_debug_names &map,
5715 search_domain search, uint32_t namei)
5718 m_addr (find_vec_in_debug_names (map, namei))
5721 /* Return the next matching CU or NULL if there are no more. */
5722 dwarf2_per_cu_data *next ();
5725 static const gdb_byte *find_vec_in_debug_names (const mapped_debug_names &map,
5727 static const gdb_byte *find_vec_in_debug_names (const mapped_debug_names &map,
5730 /* The internalized form of .debug_names. */
5731 const mapped_debug_names &m_map;
5733 /* If true, only look for symbols that match BLOCK_INDEX. */
5734 const bool m_want_specific_block = false;
5736 /* One of GLOBAL_BLOCK or STATIC_BLOCK.
5737 Unused if !WANT_SPECIFIC_BLOCK - FIRST_LOCAL_BLOCK is an invalid
5739 const block_enum m_block_index = FIRST_LOCAL_BLOCK;
5741 /* The kind of symbol we're looking for. */
5742 const domain_enum m_domain = UNDEF_DOMAIN;
5743 const search_domain m_search = ALL_DOMAIN;
5745 /* The list of CUs from the index entry of the symbol, or NULL if
5747 const gdb_byte *m_addr;
5751 mapped_debug_names::namei_to_name (uint32_t namei) const
5753 const ULONGEST namei_string_offs
5754 = extract_unsigned_integer ((name_table_string_offs_reordered
5755 + namei * offset_size),
5758 return read_indirect_string_at_offset
5759 (dwarf2_per_objfile, dwarf2_per_objfile->objfile->obfd, namei_string_offs);
5762 /* Find a slot in .debug_names for the object named NAME. If NAME is
5763 found, return pointer to its pool data. If NAME cannot be found,
5767 dw2_debug_names_iterator::find_vec_in_debug_names
5768 (const mapped_debug_names &map, const char *name)
5770 int (*cmp) (const char *, const char *);
5772 if (current_language->la_language == language_cplus
5773 || current_language->la_language == language_fortran
5774 || current_language->la_language == language_d)
5776 /* NAME is already canonical. Drop any qualifiers as
5777 .debug_names does not contain any. */
5779 if (strchr (name, '(') != NULL)
5781 gdb::unique_xmalloc_ptr<char> without_params
5782 = cp_remove_params (name);
5784 if (without_params != NULL)
5786 name = without_params.get();
5791 cmp = (case_sensitivity == case_sensitive_on ? strcmp : strcasecmp);
5793 const uint32_t full_hash = dwarf5_djb_hash (name);
5795 = extract_unsigned_integer (reinterpret_cast<const gdb_byte *>
5796 (map.bucket_table_reordered
5797 + (full_hash % map.bucket_count)), 4,
5798 map.dwarf5_byte_order);
5802 if (namei >= map.name_count)
5804 complaint (_("Wrong .debug_names with name index %u but name_count=%u "
5806 namei, map.name_count,
5807 objfile_name (map.dwarf2_per_objfile->objfile));
5813 const uint32_t namei_full_hash
5814 = extract_unsigned_integer (reinterpret_cast<const gdb_byte *>
5815 (map.hash_table_reordered + namei), 4,
5816 map.dwarf5_byte_order);
5817 if (full_hash % map.bucket_count != namei_full_hash % map.bucket_count)
5820 if (full_hash == namei_full_hash)
5822 const char *const namei_string = map.namei_to_name (namei);
5824 #if 0 /* An expensive sanity check. */
5825 if (namei_full_hash != dwarf5_djb_hash (namei_string))
5827 complaint (_("Wrong .debug_names hash for string at index %u "
5829 namei, objfile_name (dwarf2_per_objfile->objfile));
5834 if (cmp (namei_string, name) == 0)
5836 const ULONGEST namei_entry_offs
5837 = extract_unsigned_integer ((map.name_table_entry_offs_reordered
5838 + namei * map.offset_size),
5839 map.offset_size, map.dwarf5_byte_order);
5840 return map.entry_pool + namei_entry_offs;
5845 if (namei >= map.name_count)
5851 dw2_debug_names_iterator::find_vec_in_debug_names
5852 (const mapped_debug_names &map, uint32_t namei)
5854 if (namei >= map.name_count)
5856 complaint (_("Wrong .debug_names with name index %u but name_count=%u "
5858 namei, map.name_count,
5859 objfile_name (map.dwarf2_per_objfile->objfile));
5863 const ULONGEST namei_entry_offs
5864 = extract_unsigned_integer ((map.name_table_entry_offs_reordered
5865 + namei * map.offset_size),
5866 map.offset_size, map.dwarf5_byte_order);
5867 return map.entry_pool + namei_entry_offs;
5870 /* See dw2_debug_names_iterator. */
5872 dwarf2_per_cu_data *
5873 dw2_debug_names_iterator::next ()
5878 struct dwarf2_per_objfile *dwarf2_per_objfile = m_map.dwarf2_per_objfile;
5879 struct objfile *objfile = dwarf2_per_objfile->objfile;
5880 bfd *const abfd = objfile->obfd;
5884 unsigned int bytes_read;
5885 const ULONGEST abbrev = read_unsigned_leb128 (abfd, m_addr, &bytes_read);
5886 m_addr += bytes_read;
5890 const auto indexval_it = m_map.abbrev_map.find (abbrev);
5891 if (indexval_it == m_map.abbrev_map.cend ())
5893 complaint (_("Wrong .debug_names undefined abbrev code %s "
5895 pulongest (abbrev), objfile_name (objfile));
5898 const mapped_debug_names::index_val &indexval = indexval_it->second;
5899 bool have_is_static = false;
5901 dwarf2_per_cu_data *per_cu = NULL;
5902 for (const mapped_debug_names::index_val::attr &attr : indexval.attr_vec)
5907 case DW_FORM_implicit_const:
5908 ull = attr.implicit_const;
5910 case DW_FORM_flag_present:
5914 ull = read_unsigned_leb128 (abfd, m_addr, &bytes_read);
5915 m_addr += bytes_read;
5918 complaint (_("Unsupported .debug_names form %s [in module %s]"),
5919 dwarf_form_name (attr.form),
5920 objfile_name (objfile));
5923 switch (attr.dw_idx)
5925 case DW_IDX_compile_unit:
5926 /* Don't crash on bad data. */
5927 if (ull >= dwarf2_per_objfile->all_comp_units.size ())
5929 complaint (_(".debug_names entry has bad CU index %s"
5932 objfile_name (dwarf2_per_objfile->objfile));
5935 per_cu = dwarf2_per_objfile->get_cutu (ull);
5937 case DW_IDX_type_unit:
5938 /* Don't crash on bad data. */
5939 if (ull >= dwarf2_per_objfile->all_type_units.size ())
5941 complaint (_(".debug_names entry has bad TU index %s"
5944 objfile_name (dwarf2_per_objfile->objfile));
5947 per_cu = &dwarf2_per_objfile->get_tu (ull)->per_cu;
5949 case DW_IDX_GNU_internal:
5950 if (!m_map.augmentation_is_gdb)
5952 have_is_static = true;
5955 case DW_IDX_GNU_external:
5956 if (!m_map.augmentation_is_gdb)
5958 have_is_static = true;
5964 /* Skip if already read in. */
5965 if (per_cu->v.quick->compunit_symtab)
5968 /* Check static vs global. */
5971 const bool want_static = m_block_index != GLOBAL_BLOCK;
5972 if (m_want_specific_block && want_static != is_static)
5976 /* Match dw2_symtab_iter_next, symbol_kind
5977 and debug_names::psymbol_tag. */
5981 switch (indexval.dwarf_tag)
5983 case DW_TAG_variable:
5984 case DW_TAG_subprogram:
5985 /* Some types are also in VAR_DOMAIN. */
5986 case DW_TAG_typedef:
5987 case DW_TAG_structure_type:
5994 switch (indexval.dwarf_tag)
5996 case DW_TAG_typedef:
5997 case DW_TAG_structure_type:
6004 switch (indexval.dwarf_tag)
6007 case DW_TAG_variable:
6017 /* Match dw2_expand_symtabs_matching, symbol_kind and
6018 debug_names::psymbol_tag. */
6021 case VARIABLES_DOMAIN:
6022 switch (indexval.dwarf_tag)
6024 case DW_TAG_variable:
6030 case FUNCTIONS_DOMAIN:
6031 switch (indexval.dwarf_tag)
6033 case DW_TAG_subprogram:
6040 switch (indexval.dwarf_tag)
6042 case DW_TAG_typedef:
6043 case DW_TAG_structure_type:
6056 static struct compunit_symtab *
6057 dw2_debug_names_lookup_symbol (struct objfile *objfile, int block_index_int,
6058 const char *name, domain_enum domain)
6060 const block_enum block_index = static_cast<block_enum> (block_index_int);
6061 struct dwarf2_per_objfile *dwarf2_per_objfile
6062 = get_dwarf2_per_objfile (objfile);
6064 const auto &mapp = dwarf2_per_objfile->debug_names_table;
6067 /* index is NULL if OBJF_READNOW. */
6070 const auto &map = *mapp;
6072 dw2_debug_names_iterator iter (map, true /* want_specific_block */,
6073 block_index, domain, name);
6075 struct compunit_symtab *stab_best = NULL;
6076 struct dwarf2_per_cu_data *per_cu;
6077 while ((per_cu = iter.next ()) != NULL)
6079 struct symbol *sym, *with_opaque = NULL;
6080 struct compunit_symtab *stab = dw2_instantiate_symtab (per_cu, false);
6081 const struct blockvector *bv = COMPUNIT_BLOCKVECTOR (stab);
6082 const struct block *block = BLOCKVECTOR_BLOCK (bv, block_index);
6084 sym = block_find_symbol (block, name, domain,
6085 block_find_non_opaque_type_preferred,
6088 /* Some caution must be observed with overloaded functions and
6089 methods, since the index will not contain any overload
6090 information (but NAME might contain it). */
6093 && strcmp_iw (SYMBOL_SEARCH_NAME (sym), name) == 0)
6095 if (with_opaque != NULL
6096 && strcmp_iw (SYMBOL_SEARCH_NAME (with_opaque), name) == 0)
6099 /* Keep looking through other CUs. */
6105 /* This dumps minimal information about .debug_names. It is called
6106 via "mt print objfiles". The gdb.dwarf2/gdb-index.exp testcase
6107 uses this to verify that .debug_names has been loaded. */
6110 dw2_debug_names_dump (struct objfile *objfile)
6112 struct dwarf2_per_objfile *dwarf2_per_objfile
6113 = get_dwarf2_per_objfile (objfile);
6115 gdb_assert (dwarf2_per_objfile->using_index);
6116 printf_filtered (".debug_names:");
6117 if (dwarf2_per_objfile->debug_names_table)
6118 printf_filtered (" exists\n");
6120 printf_filtered (" faked for \"readnow\"\n");
6121 printf_filtered ("\n");
6125 dw2_debug_names_expand_symtabs_for_function (struct objfile *objfile,
6126 const char *func_name)
6128 struct dwarf2_per_objfile *dwarf2_per_objfile
6129 = get_dwarf2_per_objfile (objfile);
6131 /* dwarf2_per_objfile->debug_names_table is NULL if OBJF_READNOW. */
6132 if (dwarf2_per_objfile->debug_names_table)
6134 const mapped_debug_names &map = *dwarf2_per_objfile->debug_names_table;
6136 /* Note: It doesn't matter what we pass for block_index here. */
6137 dw2_debug_names_iterator iter (map, false /* want_specific_block */,
6138 GLOBAL_BLOCK, VAR_DOMAIN, func_name);
6140 struct dwarf2_per_cu_data *per_cu;
6141 while ((per_cu = iter.next ()) != NULL)
6142 dw2_instantiate_symtab (per_cu, false);
6147 dw2_debug_names_expand_symtabs_matching
6148 (struct objfile *objfile,
6149 gdb::function_view<expand_symtabs_file_matcher_ftype> file_matcher,
6150 const lookup_name_info &lookup_name,
6151 gdb::function_view<expand_symtabs_symbol_matcher_ftype> symbol_matcher,
6152 gdb::function_view<expand_symtabs_exp_notify_ftype> expansion_notify,
6153 enum search_domain kind)
6155 struct dwarf2_per_objfile *dwarf2_per_objfile
6156 = get_dwarf2_per_objfile (objfile);
6158 /* debug_names_table is NULL if OBJF_READNOW. */
6159 if (!dwarf2_per_objfile->debug_names_table)
6162 dw_expand_symtabs_matching_file_matcher (dwarf2_per_objfile, file_matcher);
6164 mapped_debug_names &map = *dwarf2_per_objfile->debug_names_table;
6166 dw2_expand_symtabs_matching_symbol (map, lookup_name,
6168 kind, [&] (offset_type namei)
6170 /* The name was matched, now expand corresponding CUs that were
6172 dw2_debug_names_iterator iter (map, kind, namei);
6174 struct dwarf2_per_cu_data *per_cu;
6175 while ((per_cu = iter.next ()) != NULL)
6176 dw2_expand_symtabs_matching_one (per_cu, file_matcher,
6181 const struct quick_symbol_functions dwarf2_debug_names_functions =
6184 dw2_find_last_source_symtab,
6185 dw2_forget_cached_source_info,
6186 dw2_map_symtabs_matching_filename,
6187 dw2_debug_names_lookup_symbol,
6189 dw2_debug_names_dump,
6190 dw2_debug_names_expand_symtabs_for_function,
6191 dw2_expand_all_symtabs,
6192 dw2_expand_symtabs_with_fullname,
6193 dw2_map_matching_symbols,
6194 dw2_debug_names_expand_symtabs_matching,
6195 dw2_find_pc_sect_compunit_symtab,
6197 dw2_map_symbol_filenames
6200 /* Get the content of the .gdb_index section of OBJ. SECTION_OWNER should point
6201 to either a dwarf2_per_objfile or dwz_file object. */
6203 template <typename T>
6204 static gdb::array_view<const gdb_byte>
6205 get_gdb_index_contents_from_section (objfile *obj, T *section_owner)
6207 dwarf2_section_info *section = §ion_owner->gdb_index;
6209 if (dwarf2_section_empty_p (section))
6212 /* Older elfutils strip versions could keep the section in the main
6213 executable while splitting it for the separate debug info file. */
6214 if ((get_section_flags (section) & SEC_HAS_CONTENTS) == 0)
6217 dwarf2_read_section (obj, section);
6219 /* dwarf2_section_info::size is a bfd_size_type, while
6220 gdb::array_view works with size_t. On 32-bit hosts, with
6221 --enable-64-bit-bfd, bfd_size_type is a 64-bit type, while size_t
6222 is 32-bit. So we need an explicit narrowing conversion here.
6223 This is fine, because it's impossible to allocate or mmap an
6224 array/buffer larger than what size_t can represent. */
6225 return gdb::make_array_view (section->buffer, section->size);
6228 /* Lookup the index cache for the contents of the index associated to
6231 static gdb::array_view<const gdb_byte>
6232 get_gdb_index_contents_from_cache (objfile *obj, dwarf2_per_objfile *dwarf2_obj)
6234 const bfd_build_id *build_id = build_id_bfd_get (obj->obfd);
6235 if (build_id == nullptr)
6238 return global_index_cache.lookup_gdb_index (build_id,
6239 &dwarf2_obj->index_cache_res);
6242 /* Same as the above, but for DWZ. */
6244 static gdb::array_view<const gdb_byte>
6245 get_gdb_index_contents_from_cache_dwz (objfile *obj, dwz_file *dwz)
6247 const bfd_build_id *build_id = build_id_bfd_get (dwz->dwz_bfd.get ());
6248 if (build_id == nullptr)
6251 return global_index_cache.lookup_gdb_index (build_id, &dwz->index_cache_res);
6254 /* See symfile.h. */
6257 dwarf2_initialize_objfile (struct objfile *objfile, dw_index_kind *index_kind)
6259 struct dwarf2_per_objfile *dwarf2_per_objfile
6260 = get_dwarf2_per_objfile (objfile);
6262 /* If we're about to read full symbols, don't bother with the
6263 indices. In this case we also don't care if some other debug
6264 format is making psymtabs, because they are all about to be
6266 if ((objfile->flags & OBJF_READNOW))
6268 dwarf2_per_objfile->using_index = 1;
6269 create_all_comp_units (dwarf2_per_objfile);
6270 create_all_type_units (dwarf2_per_objfile);
6271 dwarf2_per_objfile->quick_file_names_table
6272 = create_quick_file_names_table
6273 (dwarf2_per_objfile->all_comp_units.size ());
6275 for (int i = 0; i < (dwarf2_per_objfile->all_comp_units.size ()
6276 + dwarf2_per_objfile->all_type_units.size ()); ++i)
6278 dwarf2_per_cu_data *per_cu = dwarf2_per_objfile->get_cutu (i);
6280 per_cu->v.quick = OBSTACK_ZALLOC (&objfile->objfile_obstack,
6281 struct dwarf2_per_cu_quick_data);
6284 /* Return 1 so that gdb sees the "quick" functions. However,
6285 these functions will be no-ops because we will have expanded
6287 *index_kind = dw_index_kind::GDB_INDEX;
6291 if (dwarf2_read_debug_names (dwarf2_per_objfile))
6293 *index_kind = dw_index_kind::DEBUG_NAMES;
6297 if (dwarf2_read_gdb_index (dwarf2_per_objfile,
6298 get_gdb_index_contents_from_section<struct dwarf2_per_objfile>,
6299 get_gdb_index_contents_from_section<dwz_file>))
6301 *index_kind = dw_index_kind::GDB_INDEX;
6305 /* ... otherwise, try to find the index in the index cache. */
6306 if (dwarf2_read_gdb_index (dwarf2_per_objfile,
6307 get_gdb_index_contents_from_cache,
6308 get_gdb_index_contents_from_cache_dwz))
6310 global_index_cache.hit ();
6311 *index_kind = dw_index_kind::GDB_INDEX;
6315 global_index_cache.miss ();
6321 /* Build a partial symbol table. */
6324 dwarf2_build_psymtabs (struct objfile *objfile)
6326 struct dwarf2_per_objfile *dwarf2_per_objfile
6327 = get_dwarf2_per_objfile (objfile);
6329 init_psymbol_list (objfile, 1024);
6333 /* This isn't really ideal: all the data we allocate on the
6334 objfile's obstack is still uselessly kept around. However,
6335 freeing it seems unsafe. */
6336 psymtab_discarder psymtabs (objfile);
6337 dwarf2_build_psymtabs_hard (dwarf2_per_objfile);
6340 /* (maybe) store an index in the cache. */
6341 global_index_cache.store (dwarf2_per_objfile);
6343 catch (const gdb_exception_error &except)
6345 exception_print (gdb_stderr, except);
6349 /* Return the total length of the CU described by HEADER. */
6352 get_cu_length (const struct comp_unit_head *header)
6354 return header->initial_length_size + header->length;
6357 /* Return TRUE if SECT_OFF is within CU_HEADER. */
6360 offset_in_cu_p (const comp_unit_head *cu_header, sect_offset sect_off)
6362 sect_offset bottom = cu_header->sect_off;
6363 sect_offset top = cu_header->sect_off + get_cu_length (cu_header);
6365 return sect_off >= bottom && sect_off < top;
6368 /* Find the base address of the compilation unit for range lists and
6369 location lists. It will normally be specified by DW_AT_low_pc.
6370 In DWARF-3 draft 4, the base address could be overridden by
6371 DW_AT_entry_pc. It's been removed, but GCC still uses this for
6372 compilation units with discontinuous ranges. */
6375 dwarf2_find_base_address (struct die_info *die, struct dwarf2_cu *cu)
6377 struct attribute *attr;
6380 cu->base_address = 0;
6382 attr = dwarf2_attr (die, DW_AT_entry_pc, cu);
6385 cu->base_address = attr_value_as_address (attr);
6390 attr = dwarf2_attr (die, DW_AT_low_pc, cu);
6393 cu->base_address = attr_value_as_address (attr);
6399 /* Read in the comp unit header information from the debug_info at info_ptr.
6400 Use rcuh_kind::COMPILE as the default type if not known by the caller.
6401 NOTE: This leaves members offset, first_die_offset to be filled in
6404 static const gdb_byte *
6405 read_comp_unit_head (struct comp_unit_head *cu_header,
6406 const gdb_byte *info_ptr,
6407 struct dwarf2_section_info *section,
6408 rcuh_kind section_kind)
6411 unsigned int bytes_read;
6412 const char *filename = get_section_file_name (section);
6413 bfd *abfd = get_section_bfd_owner (section);
6415 cu_header->length = read_initial_length (abfd, info_ptr, &bytes_read);
6416 cu_header->initial_length_size = bytes_read;
6417 cu_header->offset_size = (bytes_read == 4) ? 4 : 8;
6418 info_ptr += bytes_read;
6419 cu_header->version = read_2_bytes (abfd, info_ptr);
6420 if (cu_header->version < 2 || cu_header->version > 5)
6421 error (_("Dwarf Error: wrong version in compilation unit header "
6422 "(is %d, should be 2, 3, 4 or 5) [in module %s]"),
6423 cu_header->version, filename);
6425 if (cu_header->version < 5)
6426 switch (section_kind)
6428 case rcuh_kind::COMPILE:
6429 cu_header->unit_type = DW_UT_compile;
6431 case rcuh_kind::TYPE:
6432 cu_header->unit_type = DW_UT_type;
6435 internal_error (__FILE__, __LINE__,
6436 _("read_comp_unit_head: invalid section_kind"));
6440 cu_header->unit_type = static_cast<enum dwarf_unit_type>
6441 (read_1_byte (abfd, info_ptr));
6443 switch (cu_header->unit_type)
6446 if (section_kind != rcuh_kind::COMPILE)
6447 error (_("Dwarf Error: wrong unit_type in compilation unit header "
6448 "(is DW_UT_compile, should be DW_UT_type) [in module %s]"),
6452 section_kind = rcuh_kind::TYPE;
6455 error (_("Dwarf Error: wrong unit_type in compilation unit header "
6456 "(is %d, should be %d or %d) [in module %s]"),
6457 cu_header->unit_type, DW_UT_compile, DW_UT_type, filename);
6460 cu_header->addr_size = read_1_byte (abfd, info_ptr);
6463 cu_header->abbrev_sect_off = (sect_offset) read_offset (abfd, info_ptr,
6466 info_ptr += bytes_read;
6467 if (cu_header->version < 5)
6469 cu_header->addr_size = read_1_byte (abfd, info_ptr);
6472 signed_addr = bfd_get_sign_extend_vma (abfd);
6473 if (signed_addr < 0)
6474 internal_error (__FILE__, __LINE__,
6475 _("read_comp_unit_head: dwarf from non elf file"));
6476 cu_header->signed_addr_p = signed_addr;
6478 if (section_kind == rcuh_kind::TYPE)
6480 LONGEST type_offset;
6482 cu_header->signature = read_8_bytes (abfd, info_ptr);
6485 type_offset = read_offset (abfd, info_ptr, cu_header, &bytes_read);
6486 info_ptr += bytes_read;
6487 cu_header->type_cu_offset_in_tu = (cu_offset) type_offset;
6488 if (to_underlying (cu_header->type_cu_offset_in_tu) != type_offset)
6489 error (_("Dwarf Error: Too big type_offset in compilation unit "
6490 "header (is %s) [in module %s]"), plongest (type_offset),
6497 /* Helper function that returns the proper abbrev section for
6500 static struct dwarf2_section_info *
6501 get_abbrev_section_for_cu (struct dwarf2_per_cu_data *this_cu)
6503 struct dwarf2_section_info *abbrev;
6504 struct dwarf2_per_objfile *dwarf2_per_objfile = this_cu->dwarf2_per_objfile;
6506 if (this_cu->is_dwz)
6507 abbrev = &dwarf2_get_dwz_file (dwarf2_per_objfile)->abbrev;
6509 abbrev = &dwarf2_per_objfile->abbrev;
6514 /* Subroutine of read_and_check_comp_unit_head and
6515 read_and_check_type_unit_head to simplify them.
6516 Perform various error checking on the header. */
6519 error_check_comp_unit_head (struct dwarf2_per_objfile *dwarf2_per_objfile,
6520 struct comp_unit_head *header,
6521 struct dwarf2_section_info *section,
6522 struct dwarf2_section_info *abbrev_section)
6524 const char *filename = get_section_file_name (section);
6526 if (to_underlying (header->abbrev_sect_off)
6527 >= dwarf2_section_size (dwarf2_per_objfile->objfile, abbrev_section))
6528 error (_("Dwarf Error: bad offset (%s) in compilation unit header "
6529 "(offset %s + 6) [in module %s]"),
6530 sect_offset_str (header->abbrev_sect_off),
6531 sect_offset_str (header->sect_off),
6534 /* Cast to ULONGEST to use 64-bit arithmetic when possible to
6535 avoid potential 32-bit overflow. */
6536 if (((ULONGEST) header->sect_off + get_cu_length (header))
6538 error (_("Dwarf Error: bad length (0x%x) in compilation unit header "
6539 "(offset %s + 0) [in module %s]"),
6540 header->length, sect_offset_str (header->sect_off),
6544 /* Read in a CU/TU header and perform some basic error checking.
6545 The contents of the header are stored in HEADER.
6546 The result is a pointer to the start of the first DIE. */
6548 static const gdb_byte *
6549 read_and_check_comp_unit_head (struct dwarf2_per_objfile *dwarf2_per_objfile,
6550 struct comp_unit_head *header,
6551 struct dwarf2_section_info *section,
6552 struct dwarf2_section_info *abbrev_section,
6553 const gdb_byte *info_ptr,
6554 rcuh_kind section_kind)
6556 const gdb_byte *beg_of_comp_unit = info_ptr;
6558 header->sect_off = (sect_offset) (beg_of_comp_unit - section->buffer);
6560 info_ptr = read_comp_unit_head (header, info_ptr, section, section_kind);
6562 header->first_die_cu_offset = (cu_offset) (info_ptr - beg_of_comp_unit);
6564 error_check_comp_unit_head (dwarf2_per_objfile, header, section,
6570 /* Fetch the abbreviation table offset from a comp or type unit header. */
6573 read_abbrev_offset (struct dwarf2_per_objfile *dwarf2_per_objfile,
6574 struct dwarf2_section_info *section,
6575 sect_offset sect_off)
6577 bfd *abfd = get_section_bfd_owner (section);
6578 const gdb_byte *info_ptr;
6579 unsigned int initial_length_size, offset_size;
6582 dwarf2_read_section (dwarf2_per_objfile->objfile, section);
6583 info_ptr = section->buffer + to_underlying (sect_off);
6584 read_initial_length (abfd, info_ptr, &initial_length_size);
6585 offset_size = initial_length_size == 4 ? 4 : 8;
6586 info_ptr += initial_length_size;
6588 version = read_2_bytes (abfd, info_ptr);
6592 /* Skip unit type and address size. */
6596 return (sect_offset) read_offset_1 (abfd, info_ptr, offset_size);
6599 /* Allocate a new partial symtab for file named NAME and mark this new
6600 partial symtab as being an include of PST. */
6603 dwarf2_create_include_psymtab (const char *name, struct partial_symtab *pst,
6604 struct objfile *objfile)
6606 struct partial_symtab *subpst = allocate_psymtab (name, objfile);
6608 if (!IS_ABSOLUTE_PATH (subpst->filename))
6610 /* It shares objfile->objfile_obstack. */
6611 subpst->dirname = pst->dirname;
6614 subpst->dependencies = objfile->partial_symtabs->allocate_dependencies (1);
6615 subpst->dependencies[0] = pst;
6616 subpst->number_of_dependencies = 1;
6618 subpst->read_symtab = pst->read_symtab;
6620 /* No private part is necessary for include psymtabs. This property
6621 can be used to differentiate between such include psymtabs and
6622 the regular ones. */
6623 subpst->read_symtab_private = NULL;
6626 /* Read the Line Number Program data and extract the list of files
6627 included by the source file represented by PST. Build an include
6628 partial symtab for each of these included files. */
6631 dwarf2_build_include_psymtabs (struct dwarf2_cu *cu,
6632 struct die_info *die,
6633 struct partial_symtab *pst)
6636 struct attribute *attr;
6638 attr = dwarf2_attr (die, DW_AT_stmt_list, cu);
6640 lh = dwarf_decode_line_header ((sect_offset) DW_UNSND (attr), cu);
6642 return; /* No linetable, so no includes. */
6644 /* NOTE: pst->dirname is DW_AT_comp_dir (if present). Also note
6645 that we pass in the raw text_low here; that is ok because we're
6646 only decoding the line table to make include partial symtabs, and
6647 so the addresses aren't really used. */
6648 dwarf_decode_lines (lh.get (), pst->dirname, cu, pst,
6649 pst->raw_text_low (), 1);
6653 hash_signatured_type (const void *item)
6655 const struct signatured_type *sig_type
6656 = (const struct signatured_type *) item;
6658 /* This drops the top 32 bits of the signature, but is ok for a hash. */
6659 return sig_type->signature;
6663 eq_signatured_type (const void *item_lhs, const void *item_rhs)
6665 const struct signatured_type *lhs = (const struct signatured_type *) item_lhs;
6666 const struct signatured_type *rhs = (const struct signatured_type *) item_rhs;
6668 return lhs->signature == rhs->signature;
6671 /* Allocate a hash table for signatured types. */
6674 allocate_signatured_type_table (struct objfile *objfile)
6676 return htab_create_alloc_ex (41,
6677 hash_signatured_type,
6680 &objfile->objfile_obstack,
6681 hashtab_obstack_allocate,
6682 dummy_obstack_deallocate);
6685 /* A helper function to add a signatured type CU to a table. */
6688 add_signatured_type_cu_to_table (void **slot, void *datum)
6690 struct signatured_type *sigt = (struct signatured_type *) *slot;
6691 std::vector<signatured_type *> *all_type_units
6692 = (std::vector<signatured_type *> *) datum;
6694 all_type_units->push_back (sigt);
6699 /* A helper for create_debug_types_hash_table. Read types from SECTION
6700 and fill them into TYPES_HTAB. It will process only type units,
6701 therefore DW_UT_type. */
6704 create_debug_type_hash_table (struct dwarf2_per_objfile *dwarf2_per_objfile,
6705 struct dwo_file *dwo_file,
6706 dwarf2_section_info *section, htab_t &types_htab,
6707 rcuh_kind section_kind)
6709 struct objfile *objfile = dwarf2_per_objfile->objfile;
6710 struct dwarf2_section_info *abbrev_section;
6712 const gdb_byte *info_ptr, *end_ptr;
6714 abbrev_section = (dwo_file != NULL
6715 ? &dwo_file->sections.abbrev
6716 : &dwarf2_per_objfile->abbrev);
6718 if (dwarf_read_debug)
6719 fprintf_unfiltered (gdb_stdlog, "Reading %s for %s:\n",
6720 get_section_name (section),
6721 get_section_file_name (abbrev_section));
6723 dwarf2_read_section (objfile, section);
6724 info_ptr = section->buffer;
6726 if (info_ptr == NULL)
6729 /* We can't set abfd until now because the section may be empty or
6730 not present, in which case the bfd is unknown. */
6731 abfd = get_section_bfd_owner (section);
6733 /* We don't use init_cutu_and_read_dies_simple, or some such, here
6734 because we don't need to read any dies: the signature is in the
6737 end_ptr = info_ptr + section->size;
6738 while (info_ptr < end_ptr)
6740 struct signatured_type *sig_type;
6741 struct dwo_unit *dwo_tu;
6743 const gdb_byte *ptr = info_ptr;
6744 struct comp_unit_head header;
6745 unsigned int length;
6747 sect_offset sect_off = (sect_offset) (ptr - section->buffer);
6749 /* Initialize it due to a false compiler warning. */
6750 header.signature = -1;
6751 header.type_cu_offset_in_tu = (cu_offset) -1;
6753 /* We need to read the type's signature in order to build the hash
6754 table, but we don't need anything else just yet. */
6756 ptr = read_and_check_comp_unit_head (dwarf2_per_objfile, &header, section,
6757 abbrev_section, ptr, section_kind);
6759 length = get_cu_length (&header);
6761 /* Skip dummy type units. */
6762 if (ptr >= info_ptr + length
6763 || peek_abbrev_code (abfd, ptr) == 0
6764 || header.unit_type != DW_UT_type)
6770 if (types_htab == NULL)
6773 types_htab = allocate_dwo_unit_table (objfile);
6775 types_htab = allocate_signatured_type_table (objfile);
6781 dwo_tu = OBSTACK_ZALLOC (&objfile->objfile_obstack,
6783 dwo_tu->dwo_file = dwo_file;
6784 dwo_tu->signature = header.signature;
6785 dwo_tu->type_offset_in_tu = header.type_cu_offset_in_tu;
6786 dwo_tu->section = section;
6787 dwo_tu->sect_off = sect_off;
6788 dwo_tu->length = length;
6792 /* N.B.: type_offset is not usable if this type uses a DWO file.
6793 The real type_offset is in the DWO file. */
6795 sig_type = OBSTACK_ZALLOC (&objfile->objfile_obstack,
6796 struct signatured_type);
6797 sig_type->signature = header.signature;
6798 sig_type->type_offset_in_tu = header.type_cu_offset_in_tu;
6799 sig_type->per_cu.dwarf2_per_objfile = dwarf2_per_objfile;
6800 sig_type->per_cu.is_debug_types = 1;
6801 sig_type->per_cu.section = section;
6802 sig_type->per_cu.sect_off = sect_off;
6803 sig_type->per_cu.length = length;
6806 slot = htab_find_slot (types_htab,
6807 dwo_file ? (void*) dwo_tu : (void *) sig_type,
6809 gdb_assert (slot != NULL);
6812 sect_offset dup_sect_off;
6816 const struct dwo_unit *dup_tu
6817 = (const struct dwo_unit *) *slot;
6819 dup_sect_off = dup_tu->sect_off;
6823 const struct signatured_type *dup_tu
6824 = (const struct signatured_type *) *slot;
6826 dup_sect_off = dup_tu->per_cu.sect_off;
6829 complaint (_("debug type entry at offset %s is duplicate to"
6830 " the entry at offset %s, signature %s"),
6831 sect_offset_str (sect_off), sect_offset_str (dup_sect_off),
6832 hex_string (header.signature));
6834 *slot = dwo_file ? (void *) dwo_tu : (void *) sig_type;
6836 if (dwarf_read_debug > 1)
6837 fprintf_unfiltered (gdb_stdlog, " offset %s, signature %s\n",
6838 sect_offset_str (sect_off),
6839 hex_string (header.signature));
6845 /* Create the hash table of all entries in the .debug_types
6846 (or .debug_types.dwo) section(s).
6847 If reading a DWO file, then DWO_FILE is a pointer to the DWO file object,
6848 otherwise it is NULL.
6850 The result is a pointer to the hash table or NULL if there are no types.
6852 Note: This function processes DWO files only, not DWP files. */
6855 create_debug_types_hash_table (struct dwarf2_per_objfile *dwarf2_per_objfile,
6856 struct dwo_file *dwo_file,
6857 VEC (dwarf2_section_info_def) *types,
6861 struct dwarf2_section_info *section;
6863 if (VEC_empty (dwarf2_section_info_def, types))
6867 VEC_iterate (dwarf2_section_info_def, types, ix, section);
6869 create_debug_type_hash_table (dwarf2_per_objfile, dwo_file, section,
6870 types_htab, rcuh_kind::TYPE);
6873 /* Create the hash table of all entries in the .debug_types section,
6874 and initialize all_type_units.
6875 The result is zero if there is an error (e.g. missing .debug_types section),
6876 otherwise non-zero. */
6879 create_all_type_units (struct dwarf2_per_objfile *dwarf2_per_objfile)
6881 htab_t types_htab = NULL;
6883 create_debug_type_hash_table (dwarf2_per_objfile, NULL,
6884 &dwarf2_per_objfile->info, types_htab,
6885 rcuh_kind::COMPILE);
6886 create_debug_types_hash_table (dwarf2_per_objfile, NULL,
6887 dwarf2_per_objfile->types, types_htab);
6888 if (types_htab == NULL)
6890 dwarf2_per_objfile->signatured_types = NULL;
6894 dwarf2_per_objfile->signatured_types = types_htab;
6896 gdb_assert (dwarf2_per_objfile->all_type_units.empty ());
6897 dwarf2_per_objfile->all_type_units.reserve (htab_elements (types_htab));
6899 htab_traverse_noresize (types_htab, add_signatured_type_cu_to_table,
6900 &dwarf2_per_objfile->all_type_units);
6905 /* Add an entry for signature SIG to dwarf2_per_objfile->signatured_types.
6906 If SLOT is non-NULL, it is the entry to use in the hash table.
6907 Otherwise we find one. */
6909 static struct signatured_type *
6910 add_type_unit (struct dwarf2_per_objfile *dwarf2_per_objfile, ULONGEST sig,
6913 struct objfile *objfile = dwarf2_per_objfile->objfile;
6915 if (dwarf2_per_objfile->all_type_units.size ()
6916 == dwarf2_per_objfile->all_type_units.capacity ())
6917 ++dwarf2_per_objfile->tu_stats.nr_all_type_units_reallocs;
6919 signatured_type *sig_type = OBSTACK_ZALLOC (&objfile->objfile_obstack,
6920 struct signatured_type);
6922 dwarf2_per_objfile->all_type_units.push_back (sig_type);
6923 sig_type->signature = sig;
6924 sig_type->per_cu.is_debug_types = 1;
6925 if (dwarf2_per_objfile->using_index)
6927 sig_type->per_cu.v.quick =
6928 OBSTACK_ZALLOC (&objfile->objfile_obstack,
6929 struct dwarf2_per_cu_quick_data);
6934 slot = htab_find_slot (dwarf2_per_objfile->signatured_types,
6937 gdb_assert (*slot == NULL);
6939 /* The rest of sig_type must be filled in by the caller. */
6943 /* Subroutine of lookup_dwo_signatured_type and lookup_dwp_signatured_type.
6944 Fill in SIG_ENTRY with DWO_ENTRY. */
6947 fill_in_sig_entry_from_dwo_entry (struct dwarf2_per_objfile *dwarf2_per_objfile,
6948 struct signatured_type *sig_entry,
6949 struct dwo_unit *dwo_entry)
6951 /* Make sure we're not clobbering something we don't expect to. */
6952 gdb_assert (! sig_entry->per_cu.queued);
6953 gdb_assert (sig_entry->per_cu.cu == NULL);
6954 if (dwarf2_per_objfile->using_index)
6956 gdb_assert (sig_entry->per_cu.v.quick != NULL);
6957 gdb_assert (sig_entry->per_cu.v.quick->compunit_symtab == NULL);
6960 gdb_assert (sig_entry->per_cu.v.psymtab == NULL);
6961 gdb_assert (sig_entry->signature == dwo_entry->signature);
6962 gdb_assert (to_underlying (sig_entry->type_offset_in_section) == 0);
6963 gdb_assert (sig_entry->type_unit_group == NULL);
6964 gdb_assert (sig_entry->dwo_unit == NULL);
6966 sig_entry->per_cu.section = dwo_entry->section;
6967 sig_entry->per_cu.sect_off = dwo_entry->sect_off;
6968 sig_entry->per_cu.length = dwo_entry->length;
6969 sig_entry->per_cu.reading_dwo_directly = 1;
6970 sig_entry->per_cu.dwarf2_per_objfile = dwarf2_per_objfile;
6971 sig_entry->type_offset_in_tu = dwo_entry->type_offset_in_tu;
6972 sig_entry->dwo_unit = dwo_entry;
6975 /* Subroutine of lookup_signatured_type.
6976 If we haven't read the TU yet, create the signatured_type data structure
6977 for a TU to be read in directly from a DWO file, bypassing the stub.
6978 This is the "Stay in DWO Optimization": When there is no DWP file and we're
6979 using .gdb_index, then when reading a CU we want to stay in the DWO file
6980 containing that CU. Otherwise we could end up reading several other DWO
6981 files (due to comdat folding) to process the transitive closure of all the
6982 mentioned TUs, and that can be slow. The current DWO file will have every
6983 type signature that it needs.
6984 We only do this for .gdb_index because in the psymtab case we already have
6985 to read all the DWOs to build the type unit groups. */
6987 static struct signatured_type *
6988 lookup_dwo_signatured_type (struct dwarf2_cu *cu, ULONGEST sig)
6990 struct dwarf2_per_objfile *dwarf2_per_objfile
6991 = cu->per_cu->dwarf2_per_objfile;
6992 struct objfile *objfile = dwarf2_per_objfile->objfile;
6993 struct dwo_file *dwo_file;
6994 struct dwo_unit find_dwo_entry, *dwo_entry;
6995 struct signatured_type find_sig_entry, *sig_entry;
6998 gdb_assert (cu->dwo_unit && dwarf2_per_objfile->using_index);
7000 /* If TU skeletons have been removed then we may not have read in any
7002 if (dwarf2_per_objfile->signatured_types == NULL)
7004 dwarf2_per_objfile->signatured_types
7005 = allocate_signatured_type_table (objfile);
7008 /* We only ever need to read in one copy of a signatured type.
7009 Use the global signatured_types array to do our own comdat-folding
7010 of types. If this is the first time we're reading this TU, and
7011 the TU has an entry in .gdb_index, replace the recorded data from
7012 .gdb_index with this TU. */
7014 find_sig_entry.signature = sig;
7015 slot = htab_find_slot (dwarf2_per_objfile->signatured_types,
7016 &find_sig_entry, INSERT);
7017 sig_entry = (struct signatured_type *) *slot;
7019 /* We can get here with the TU already read, *or* in the process of being
7020 read. Don't reassign the global entry to point to this DWO if that's
7021 the case. Also note that if the TU is already being read, it may not
7022 have come from a DWO, the program may be a mix of Fission-compiled
7023 code and non-Fission-compiled code. */
7025 /* Have we already tried to read this TU?
7026 Note: sig_entry can be NULL if the skeleton TU was removed (thus it
7027 needn't exist in the global table yet). */
7028 if (sig_entry != NULL && sig_entry->per_cu.tu_read)
7031 /* Note: cu->dwo_unit is the dwo_unit that references this TU, not the
7032 dwo_unit of the TU itself. */
7033 dwo_file = cu->dwo_unit->dwo_file;
7035 /* Ok, this is the first time we're reading this TU. */
7036 if (dwo_file->tus == NULL)
7038 find_dwo_entry.signature = sig;
7039 dwo_entry = (struct dwo_unit *) htab_find (dwo_file->tus, &find_dwo_entry);
7040 if (dwo_entry == NULL)
7043 /* If the global table doesn't have an entry for this TU, add one. */
7044 if (sig_entry == NULL)
7045 sig_entry = add_type_unit (dwarf2_per_objfile, sig, slot);
7047 fill_in_sig_entry_from_dwo_entry (dwarf2_per_objfile, sig_entry, dwo_entry);
7048 sig_entry->per_cu.tu_read = 1;
7052 /* Subroutine of lookup_signatured_type.
7053 Look up the type for signature SIG, and if we can't find SIG in .gdb_index
7054 then try the DWP file. If the TU stub (skeleton) has been removed then
7055 it won't be in .gdb_index. */
7057 static struct signatured_type *
7058 lookup_dwp_signatured_type (struct dwarf2_cu *cu, ULONGEST sig)
7060 struct dwarf2_per_objfile *dwarf2_per_objfile
7061 = cu->per_cu->dwarf2_per_objfile;
7062 struct objfile *objfile = dwarf2_per_objfile->objfile;
7063 struct dwp_file *dwp_file = get_dwp_file (dwarf2_per_objfile);
7064 struct dwo_unit *dwo_entry;
7065 struct signatured_type find_sig_entry, *sig_entry;
7068 gdb_assert (cu->dwo_unit && dwarf2_per_objfile->using_index);
7069 gdb_assert (dwp_file != NULL);
7071 /* If TU skeletons have been removed then we may not have read in any
7073 if (dwarf2_per_objfile->signatured_types == NULL)
7075 dwarf2_per_objfile->signatured_types
7076 = allocate_signatured_type_table (objfile);
7079 find_sig_entry.signature = sig;
7080 slot = htab_find_slot (dwarf2_per_objfile->signatured_types,
7081 &find_sig_entry, INSERT);
7082 sig_entry = (struct signatured_type *) *slot;
7084 /* Have we already tried to read this TU?
7085 Note: sig_entry can be NULL if the skeleton TU was removed (thus it
7086 needn't exist in the global table yet). */
7087 if (sig_entry != NULL)
7090 if (dwp_file->tus == NULL)
7092 dwo_entry = lookup_dwo_unit_in_dwp (dwarf2_per_objfile, dwp_file, NULL,
7093 sig, 1 /* is_debug_types */);
7094 if (dwo_entry == NULL)
7097 sig_entry = add_type_unit (dwarf2_per_objfile, sig, slot);
7098 fill_in_sig_entry_from_dwo_entry (dwarf2_per_objfile, sig_entry, dwo_entry);
7103 /* Lookup a signature based type for DW_FORM_ref_sig8.
7104 Returns NULL if signature SIG is not present in the table.
7105 It is up to the caller to complain about this. */
7107 static struct signatured_type *
7108 lookup_signatured_type (struct dwarf2_cu *cu, ULONGEST sig)
7110 struct dwarf2_per_objfile *dwarf2_per_objfile
7111 = cu->per_cu->dwarf2_per_objfile;
7114 && dwarf2_per_objfile->using_index)
7116 /* We're in a DWO/DWP file, and we're using .gdb_index.
7117 These cases require special processing. */
7118 if (get_dwp_file (dwarf2_per_objfile) == NULL)
7119 return lookup_dwo_signatured_type (cu, sig);
7121 return lookup_dwp_signatured_type (cu, sig);
7125 struct signatured_type find_entry, *entry;
7127 if (dwarf2_per_objfile->signatured_types == NULL)
7129 find_entry.signature = sig;
7130 entry = ((struct signatured_type *)
7131 htab_find (dwarf2_per_objfile->signatured_types, &find_entry));
7136 /* Low level DIE reading support. */
7138 /* Initialize a die_reader_specs struct from a dwarf2_cu struct. */
7141 init_cu_die_reader (struct die_reader_specs *reader,
7142 struct dwarf2_cu *cu,
7143 struct dwarf2_section_info *section,
7144 struct dwo_file *dwo_file,
7145 struct abbrev_table *abbrev_table)
7147 gdb_assert (section->readin && section->buffer != NULL);
7148 reader->abfd = get_section_bfd_owner (section);
7150 reader->dwo_file = dwo_file;
7151 reader->die_section = section;
7152 reader->buffer = section->buffer;
7153 reader->buffer_end = section->buffer + section->size;
7154 reader->comp_dir = NULL;
7155 reader->abbrev_table = abbrev_table;
7158 /* Subroutine of init_cutu_and_read_dies to simplify it.
7159 Read in the rest of a CU/TU top level DIE from DWO_UNIT.
7160 There's just a lot of work to do, and init_cutu_and_read_dies is big enough
7163 STUB_COMP_UNIT_DIE is for the stub DIE, we copy over certain attributes
7164 from it to the DIE in the DWO. If NULL we are skipping the stub.
7165 STUB_COMP_DIR is similar to STUB_COMP_UNIT_DIE: When reading a TU directly
7166 from the DWO file, bypassing the stub, it contains the DW_AT_comp_dir
7167 attribute of the referencing CU. At most one of STUB_COMP_UNIT_DIE and
7168 STUB_COMP_DIR may be non-NULL.
7169 *RESULT_READER,*RESULT_INFO_PTR,*RESULT_COMP_UNIT_DIE,*RESULT_HAS_CHILDREN
7170 are filled in with the info of the DIE from the DWO file.
7171 *RESULT_DWO_ABBREV_TABLE will be filled in with the abbrev table allocated
7172 from the dwo. Since *RESULT_READER references this abbrev table, it must be
7173 kept around for at least as long as *RESULT_READER.
7175 The result is non-zero if a valid (non-dummy) DIE was found. */
7178 read_cutu_die_from_dwo (struct dwarf2_per_cu_data *this_cu,
7179 struct dwo_unit *dwo_unit,
7180 struct die_info *stub_comp_unit_die,
7181 const char *stub_comp_dir,
7182 struct die_reader_specs *result_reader,
7183 const gdb_byte **result_info_ptr,
7184 struct die_info **result_comp_unit_die,
7185 int *result_has_children,
7186 abbrev_table_up *result_dwo_abbrev_table)
7188 struct dwarf2_per_objfile *dwarf2_per_objfile = this_cu->dwarf2_per_objfile;
7189 struct objfile *objfile = dwarf2_per_objfile->objfile;
7190 struct dwarf2_cu *cu = this_cu->cu;
7192 const gdb_byte *begin_info_ptr, *info_ptr;
7193 struct attribute *comp_dir, *stmt_list, *low_pc, *high_pc, *ranges;
7194 int i,num_extra_attrs;
7195 struct dwarf2_section_info *dwo_abbrev_section;
7196 struct attribute *attr;
7197 struct die_info *comp_unit_die;
7199 /* At most one of these may be provided. */
7200 gdb_assert ((stub_comp_unit_die != NULL) + (stub_comp_dir != NULL) <= 1);
7202 /* These attributes aren't processed until later:
7203 DW_AT_stmt_list, DW_AT_low_pc, DW_AT_high_pc, DW_AT_ranges.
7204 DW_AT_comp_dir is used now, to find the DWO file, but it is also
7205 referenced later. However, these attributes are found in the stub
7206 which we won't have later. In order to not impose this complication
7207 on the rest of the code, we read them here and copy them to the
7216 if (stub_comp_unit_die != NULL)
7218 /* For TUs in DWO files, the DW_AT_stmt_list attribute lives in the
7220 if (! this_cu->is_debug_types)
7221 stmt_list = dwarf2_attr (stub_comp_unit_die, DW_AT_stmt_list, cu);
7222 low_pc = dwarf2_attr (stub_comp_unit_die, DW_AT_low_pc, cu);
7223 high_pc = dwarf2_attr (stub_comp_unit_die, DW_AT_high_pc, cu);
7224 ranges = dwarf2_attr (stub_comp_unit_die, DW_AT_ranges, cu);
7225 comp_dir = dwarf2_attr (stub_comp_unit_die, DW_AT_comp_dir, cu);
7227 /* There should be a DW_AT_addr_base attribute here (if needed).
7228 We need the value before we can process DW_FORM_GNU_addr_index
7229 or DW_FORM_addrx. */
7231 attr = dwarf2_attr (stub_comp_unit_die, DW_AT_GNU_addr_base, cu);
7233 cu->addr_base = DW_UNSND (attr);
7235 /* There should be a DW_AT_ranges_base attribute here (if needed).
7236 We need the value before we can process DW_AT_ranges. */
7237 cu->ranges_base = 0;
7238 attr = dwarf2_attr (stub_comp_unit_die, DW_AT_GNU_ranges_base, cu);
7240 cu->ranges_base = DW_UNSND (attr);
7242 else if (stub_comp_dir != NULL)
7244 /* Reconstruct the comp_dir attribute to simplify the code below. */
7245 comp_dir = XOBNEW (&cu->comp_unit_obstack, struct attribute);
7246 comp_dir->name = DW_AT_comp_dir;
7247 comp_dir->form = DW_FORM_string;
7248 DW_STRING_IS_CANONICAL (comp_dir) = 0;
7249 DW_STRING (comp_dir) = stub_comp_dir;
7252 /* Set up for reading the DWO CU/TU. */
7253 cu->dwo_unit = dwo_unit;
7254 dwarf2_section_info *section = dwo_unit->section;
7255 dwarf2_read_section (objfile, section);
7256 abfd = get_section_bfd_owner (section);
7257 begin_info_ptr = info_ptr = (section->buffer
7258 + to_underlying (dwo_unit->sect_off));
7259 dwo_abbrev_section = &dwo_unit->dwo_file->sections.abbrev;
7261 if (this_cu->is_debug_types)
7263 struct signatured_type *sig_type = (struct signatured_type *) this_cu;
7265 info_ptr = read_and_check_comp_unit_head (dwarf2_per_objfile,
7266 &cu->header, section,
7268 info_ptr, rcuh_kind::TYPE);
7269 /* This is not an assert because it can be caused by bad debug info. */
7270 if (sig_type->signature != cu->header.signature)
7272 error (_("Dwarf Error: signature mismatch %s vs %s while reading"
7273 " TU at offset %s [in module %s]"),
7274 hex_string (sig_type->signature),
7275 hex_string (cu->header.signature),
7276 sect_offset_str (dwo_unit->sect_off),
7277 bfd_get_filename (abfd));
7279 gdb_assert (dwo_unit->sect_off == cu->header.sect_off);
7280 /* For DWOs coming from DWP files, we don't know the CU length
7281 nor the type's offset in the TU until now. */
7282 dwo_unit->length = get_cu_length (&cu->header);
7283 dwo_unit->type_offset_in_tu = cu->header.type_cu_offset_in_tu;
7285 /* Establish the type offset that can be used to lookup the type.
7286 For DWO files, we don't know it until now. */
7287 sig_type->type_offset_in_section
7288 = dwo_unit->sect_off + to_underlying (dwo_unit->type_offset_in_tu);
7292 info_ptr = read_and_check_comp_unit_head (dwarf2_per_objfile,
7293 &cu->header, section,
7295 info_ptr, rcuh_kind::COMPILE);
7296 gdb_assert (dwo_unit->sect_off == cu->header.sect_off);
7297 /* For DWOs coming from DWP files, we don't know the CU length
7299 dwo_unit->length = get_cu_length (&cu->header);
7302 *result_dwo_abbrev_table
7303 = abbrev_table_read_table (dwarf2_per_objfile, dwo_abbrev_section,
7304 cu->header.abbrev_sect_off);
7305 init_cu_die_reader (result_reader, cu, section, dwo_unit->dwo_file,
7306 result_dwo_abbrev_table->get ());
7308 /* Read in the die, but leave space to copy over the attributes
7309 from the stub. This has the benefit of simplifying the rest of
7310 the code - all the work to maintain the illusion of a single
7311 DW_TAG_{compile,type}_unit DIE is done here. */
7312 num_extra_attrs = ((stmt_list != NULL)
7316 + (comp_dir != NULL));
7317 info_ptr = read_full_die_1 (result_reader, result_comp_unit_die, info_ptr,
7318 result_has_children, num_extra_attrs);
7320 /* Copy over the attributes from the stub to the DIE we just read in. */
7321 comp_unit_die = *result_comp_unit_die;
7322 i = comp_unit_die->num_attrs;
7323 if (stmt_list != NULL)
7324 comp_unit_die->attrs[i++] = *stmt_list;
7326 comp_unit_die->attrs[i++] = *low_pc;
7327 if (high_pc != NULL)
7328 comp_unit_die->attrs[i++] = *high_pc;
7330 comp_unit_die->attrs[i++] = *ranges;
7331 if (comp_dir != NULL)
7332 comp_unit_die->attrs[i++] = *comp_dir;
7333 comp_unit_die->num_attrs += num_extra_attrs;
7335 if (dwarf_die_debug)
7337 fprintf_unfiltered (gdb_stdlog,
7338 "Read die from %s@0x%x of %s:\n",
7339 get_section_name (section),
7340 (unsigned) (begin_info_ptr - section->buffer),
7341 bfd_get_filename (abfd));
7342 dump_die (comp_unit_die, dwarf_die_debug);
7345 /* Save the comp_dir attribute. If there is no DWP file then we'll read
7346 TUs by skipping the stub and going directly to the entry in the DWO file.
7347 However, skipping the stub means we won't get DW_AT_comp_dir, so we have
7348 to get it via circuitous means. Blech. */
7349 if (comp_dir != NULL)
7350 result_reader->comp_dir = DW_STRING (comp_dir);
7352 /* Skip dummy compilation units. */
7353 if (info_ptr >= begin_info_ptr + dwo_unit->length
7354 || peek_abbrev_code (abfd, info_ptr) == 0)
7357 *result_info_ptr = info_ptr;
7361 /* Subroutine of init_cutu_and_read_dies to simplify it.
7362 Look up the DWO unit specified by COMP_UNIT_DIE of THIS_CU.
7363 Returns NULL if the specified DWO unit cannot be found. */
7365 static struct dwo_unit *
7366 lookup_dwo_unit (struct dwarf2_per_cu_data *this_cu,
7367 struct die_info *comp_unit_die)
7369 struct dwarf2_cu *cu = this_cu->cu;
7371 struct dwo_unit *dwo_unit;
7372 const char *comp_dir, *dwo_name;
7374 gdb_assert (cu != NULL);
7376 /* Yeah, we look dwo_name up again, but it simplifies the code. */
7377 dwo_name = dwarf2_string_attr (comp_unit_die, DW_AT_GNU_dwo_name, cu);
7378 comp_dir = dwarf2_string_attr (comp_unit_die, DW_AT_comp_dir, cu);
7380 if (this_cu->is_debug_types)
7382 struct signatured_type *sig_type;
7384 /* Since this_cu is the first member of struct signatured_type,
7385 we can go from a pointer to one to a pointer to the other. */
7386 sig_type = (struct signatured_type *) this_cu;
7387 signature = sig_type->signature;
7388 dwo_unit = lookup_dwo_type_unit (sig_type, dwo_name, comp_dir);
7392 struct attribute *attr;
7394 attr = dwarf2_attr (comp_unit_die, DW_AT_GNU_dwo_id, cu);
7396 error (_("Dwarf Error: missing dwo_id for dwo_name %s"
7398 dwo_name, objfile_name (this_cu->dwarf2_per_objfile->objfile));
7399 signature = DW_UNSND (attr);
7400 dwo_unit = lookup_dwo_comp_unit (this_cu, dwo_name, comp_dir,
7407 /* Subroutine of init_cutu_and_read_dies to simplify it.
7408 See it for a description of the parameters.
7409 Read a TU directly from a DWO file, bypassing the stub. */
7412 init_tu_and_read_dwo_dies (struct dwarf2_per_cu_data *this_cu,
7413 int use_existing_cu, int keep,
7414 die_reader_func_ftype *die_reader_func,
7417 std::unique_ptr<dwarf2_cu> new_cu;
7418 struct signatured_type *sig_type;
7419 struct die_reader_specs reader;
7420 const gdb_byte *info_ptr;
7421 struct die_info *comp_unit_die;
7423 struct dwarf2_per_objfile *dwarf2_per_objfile = this_cu->dwarf2_per_objfile;
7425 /* Verify we can do the following downcast, and that we have the
7427 gdb_assert (this_cu->is_debug_types && this_cu->reading_dwo_directly);
7428 sig_type = (struct signatured_type *) this_cu;
7429 gdb_assert (sig_type->dwo_unit != NULL);
7431 if (use_existing_cu && this_cu->cu != NULL)
7433 gdb_assert (this_cu->cu->dwo_unit == sig_type->dwo_unit);
7434 /* There's no need to do the rereading_dwo_cu handling that
7435 init_cutu_and_read_dies does since we don't read the stub. */
7439 /* If !use_existing_cu, this_cu->cu must be NULL. */
7440 gdb_assert (this_cu->cu == NULL);
7441 new_cu.reset (new dwarf2_cu (this_cu));
7444 /* A future optimization, if needed, would be to use an existing
7445 abbrev table. When reading DWOs with skeletonless TUs, all the TUs
7446 could share abbrev tables. */
7448 /* The abbreviation table used by READER, this must live at least as long as
7450 abbrev_table_up dwo_abbrev_table;
7452 if (read_cutu_die_from_dwo (this_cu, sig_type->dwo_unit,
7453 NULL /* stub_comp_unit_die */,
7454 sig_type->dwo_unit->dwo_file->comp_dir,
7456 &comp_unit_die, &has_children,
7457 &dwo_abbrev_table) == 0)
7463 /* All the "real" work is done here. */
7464 die_reader_func (&reader, info_ptr, comp_unit_die, has_children, data);
7466 /* This duplicates the code in init_cutu_and_read_dies,
7467 but the alternative is making the latter more complex.
7468 This function is only for the special case of using DWO files directly:
7469 no point in overly complicating the general case just to handle this. */
7470 if (new_cu != NULL && keep)
7472 /* Link this CU into read_in_chain. */
7473 this_cu->cu->read_in_chain = dwarf2_per_objfile->read_in_chain;
7474 dwarf2_per_objfile->read_in_chain = this_cu;
7475 /* The chain owns it now. */
7480 /* Initialize a CU (or TU) and read its DIEs.
7481 If the CU defers to a DWO file, read the DWO file as well.
7483 ABBREV_TABLE, if non-NULL, is the abbreviation table to use.
7484 Otherwise the table specified in the comp unit header is read in and used.
7485 This is an optimization for when we already have the abbrev table.
7487 If USE_EXISTING_CU is non-zero, and THIS_CU->cu is non-NULL, then use it.
7488 Otherwise, a new CU is allocated with xmalloc.
7490 If KEEP is non-zero, then if we allocated a dwarf2_cu we add it to
7491 read_in_chain. Otherwise the dwarf2_cu data is freed at the end.
7493 WARNING: If THIS_CU is a "dummy CU" (used as filler by the incremental
7494 linker) then DIE_READER_FUNC will not get called. */
7497 init_cutu_and_read_dies (struct dwarf2_per_cu_data *this_cu,
7498 struct abbrev_table *abbrev_table,
7499 int use_existing_cu, int keep,
7501 die_reader_func_ftype *die_reader_func,
7504 struct dwarf2_per_objfile *dwarf2_per_objfile = this_cu->dwarf2_per_objfile;
7505 struct objfile *objfile = dwarf2_per_objfile->objfile;
7506 struct dwarf2_section_info *section = this_cu->section;
7507 bfd *abfd = get_section_bfd_owner (section);
7508 struct dwarf2_cu *cu;
7509 const gdb_byte *begin_info_ptr, *info_ptr;
7510 struct die_reader_specs reader;
7511 struct die_info *comp_unit_die;
7513 struct attribute *attr;
7514 struct signatured_type *sig_type = NULL;
7515 struct dwarf2_section_info *abbrev_section;
7516 /* Non-zero if CU currently points to a DWO file and we need to
7517 reread it. When this happens we need to reread the skeleton die
7518 before we can reread the DWO file (this only applies to CUs, not TUs). */
7519 int rereading_dwo_cu = 0;
7521 if (dwarf_die_debug)
7522 fprintf_unfiltered (gdb_stdlog, "Reading %s unit at offset %s\n",
7523 this_cu->is_debug_types ? "type" : "comp",
7524 sect_offset_str (this_cu->sect_off));
7526 if (use_existing_cu)
7529 /* If we're reading a TU directly from a DWO file, including a virtual DWO
7530 file (instead of going through the stub), short-circuit all of this. */
7531 if (this_cu->reading_dwo_directly)
7533 /* Narrow down the scope of possibilities to have to understand. */
7534 gdb_assert (this_cu->is_debug_types);
7535 gdb_assert (abbrev_table == NULL);
7536 init_tu_and_read_dwo_dies (this_cu, use_existing_cu, keep,
7537 die_reader_func, data);
7541 /* This is cheap if the section is already read in. */
7542 dwarf2_read_section (objfile, section);
7544 begin_info_ptr = info_ptr = section->buffer + to_underlying (this_cu->sect_off);
7546 abbrev_section = get_abbrev_section_for_cu (this_cu);
7548 std::unique_ptr<dwarf2_cu> new_cu;
7549 if (use_existing_cu && this_cu->cu != NULL)
7552 /* If this CU is from a DWO file we need to start over, we need to
7553 refetch the attributes from the skeleton CU.
7554 This could be optimized by retrieving those attributes from when we
7555 were here the first time: the previous comp_unit_die was stored in
7556 comp_unit_obstack. But there's no data yet that we need this
7558 if (cu->dwo_unit != NULL)
7559 rereading_dwo_cu = 1;
7563 /* If !use_existing_cu, this_cu->cu must be NULL. */
7564 gdb_assert (this_cu->cu == NULL);
7565 new_cu.reset (new dwarf2_cu (this_cu));
7569 /* Get the header. */
7570 if (to_underlying (cu->header.first_die_cu_offset) != 0 && !rereading_dwo_cu)
7572 /* We already have the header, there's no need to read it in again. */
7573 info_ptr += to_underlying (cu->header.first_die_cu_offset);
7577 if (this_cu->is_debug_types)
7579 info_ptr = read_and_check_comp_unit_head (dwarf2_per_objfile,
7580 &cu->header, section,
7581 abbrev_section, info_ptr,
7584 /* Since per_cu is the first member of struct signatured_type,
7585 we can go from a pointer to one to a pointer to the other. */
7586 sig_type = (struct signatured_type *) this_cu;
7587 gdb_assert (sig_type->signature == cu->header.signature);
7588 gdb_assert (sig_type->type_offset_in_tu
7589 == cu->header.type_cu_offset_in_tu);
7590 gdb_assert (this_cu->sect_off == cu->header.sect_off);
7592 /* LENGTH has not been set yet for type units if we're
7593 using .gdb_index. */
7594 this_cu->length = get_cu_length (&cu->header);
7596 /* Establish the type offset that can be used to lookup the type. */
7597 sig_type->type_offset_in_section =
7598 this_cu->sect_off + to_underlying (sig_type->type_offset_in_tu);
7600 this_cu->dwarf_version = cu->header.version;
7604 info_ptr = read_and_check_comp_unit_head (dwarf2_per_objfile,
7605 &cu->header, section,
7608 rcuh_kind::COMPILE);
7610 gdb_assert (this_cu->sect_off == cu->header.sect_off);
7611 gdb_assert (this_cu->length == get_cu_length (&cu->header));
7612 this_cu->dwarf_version = cu->header.version;
7616 /* Skip dummy compilation units. */
7617 if (info_ptr >= begin_info_ptr + this_cu->length
7618 || peek_abbrev_code (abfd, info_ptr) == 0)
7621 /* If we don't have them yet, read the abbrevs for this compilation unit.
7622 And if we need to read them now, make sure they're freed when we're
7623 done (own the table through ABBREV_TABLE_HOLDER). */
7624 abbrev_table_up abbrev_table_holder;
7625 if (abbrev_table != NULL)
7626 gdb_assert (cu->header.abbrev_sect_off == abbrev_table->sect_off);
7630 = abbrev_table_read_table (dwarf2_per_objfile, abbrev_section,
7631 cu->header.abbrev_sect_off);
7632 abbrev_table = abbrev_table_holder.get ();
7635 /* Read the top level CU/TU die. */
7636 init_cu_die_reader (&reader, cu, section, NULL, abbrev_table);
7637 info_ptr = read_full_die (&reader, &comp_unit_die, info_ptr, &has_children);
7639 if (skip_partial && comp_unit_die->tag == DW_TAG_partial_unit)
7642 /* If we are in a DWO stub, process it and then read in the "real" CU/TU
7643 from the DWO file. read_cutu_die_from_dwo will allocate the abbreviation
7644 table from the DWO file and pass the ownership over to us. It will be
7645 referenced from READER, so we must make sure to free it after we're done
7648 Note that if USE_EXISTING_OK != 0, and THIS_CU->cu already contains a
7649 DWO CU, that this test will fail (the attribute will not be present). */
7650 attr = dwarf2_attr (comp_unit_die, DW_AT_GNU_dwo_name, cu);
7651 abbrev_table_up dwo_abbrev_table;
7654 struct dwo_unit *dwo_unit;
7655 struct die_info *dwo_comp_unit_die;
7659 complaint (_("compilation unit with DW_AT_GNU_dwo_name"
7660 " has children (offset %s) [in module %s]"),
7661 sect_offset_str (this_cu->sect_off),
7662 bfd_get_filename (abfd));
7664 dwo_unit = lookup_dwo_unit (this_cu, comp_unit_die);
7665 if (dwo_unit != NULL)
7667 if (read_cutu_die_from_dwo (this_cu, dwo_unit,
7668 comp_unit_die, NULL,
7670 &dwo_comp_unit_die, &has_children,
7671 &dwo_abbrev_table) == 0)
7676 comp_unit_die = dwo_comp_unit_die;
7680 /* Yikes, we couldn't find the rest of the DIE, we only have
7681 the stub. A complaint has already been logged. There's
7682 not much more we can do except pass on the stub DIE to
7683 die_reader_func. We don't want to throw an error on bad
7688 /* All of the above is setup for this call. Yikes. */
7689 die_reader_func (&reader, info_ptr, comp_unit_die, has_children, data);
7691 /* Done, clean up. */
7692 if (new_cu != NULL && keep)
7694 /* Link this CU into read_in_chain. */
7695 this_cu->cu->read_in_chain = dwarf2_per_objfile->read_in_chain;
7696 dwarf2_per_objfile->read_in_chain = this_cu;
7697 /* The chain owns it now. */
7702 /* Read CU/TU THIS_CU but do not follow DW_AT_GNU_dwo_name if present.
7703 DWO_FILE, if non-NULL, is the DWO file to read (the caller is assumed
7704 to have already done the lookup to find the DWO file).
7706 The caller is required to fill in THIS_CU->section, THIS_CU->offset, and
7707 THIS_CU->is_debug_types, but nothing else.
7709 We fill in THIS_CU->length.
7711 WARNING: If THIS_CU is a "dummy CU" (used as filler by the incremental
7712 linker) then DIE_READER_FUNC will not get called.
7714 THIS_CU->cu is always freed when done.
7715 This is done in order to not leave THIS_CU->cu in a state where we have
7716 to care whether it refers to the "main" CU or the DWO CU. */
7719 init_cutu_and_read_dies_no_follow (struct dwarf2_per_cu_data *this_cu,
7720 struct dwo_file *dwo_file,
7721 die_reader_func_ftype *die_reader_func,
7724 struct dwarf2_per_objfile *dwarf2_per_objfile = this_cu->dwarf2_per_objfile;
7725 struct objfile *objfile = dwarf2_per_objfile->objfile;
7726 struct dwarf2_section_info *section = this_cu->section;
7727 bfd *abfd = get_section_bfd_owner (section);
7728 struct dwarf2_section_info *abbrev_section;
7729 const gdb_byte *begin_info_ptr, *info_ptr;
7730 struct die_reader_specs reader;
7731 struct die_info *comp_unit_die;
7734 if (dwarf_die_debug)
7735 fprintf_unfiltered (gdb_stdlog, "Reading %s unit at offset %s\n",
7736 this_cu->is_debug_types ? "type" : "comp",
7737 sect_offset_str (this_cu->sect_off));
7739 gdb_assert (this_cu->cu == NULL);
7741 abbrev_section = (dwo_file != NULL
7742 ? &dwo_file->sections.abbrev
7743 : get_abbrev_section_for_cu (this_cu));
7745 /* This is cheap if the section is already read in. */
7746 dwarf2_read_section (objfile, section);
7748 struct dwarf2_cu cu (this_cu);
7750 begin_info_ptr = info_ptr = section->buffer + to_underlying (this_cu->sect_off);
7751 info_ptr = read_and_check_comp_unit_head (dwarf2_per_objfile,
7752 &cu.header, section,
7753 abbrev_section, info_ptr,
7754 (this_cu->is_debug_types
7756 : rcuh_kind::COMPILE));
7758 this_cu->length = get_cu_length (&cu.header);
7760 /* Skip dummy compilation units. */
7761 if (info_ptr >= begin_info_ptr + this_cu->length
7762 || peek_abbrev_code (abfd, info_ptr) == 0)
7765 abbrev_table_up abbrev_table
7766 = abbrev_table_read_table (dwarf2_per_objfile, abbrev_section,
7767 cu.header.abbrev_sect_off);
7769 init_cu_die_reader (&reader, &cu, section, dwo_file, abbrev_table.get ());
7770 info_ptr = read_full_die (&reader, &comp_unit_die, info_ptr, &has_children);
7772 die_reader_func (&reader, info_ptr, comp_unit_die, has_children, data);
7775 /* Read a CU/TU, except that this does not look for DW_AT_GNU_dwo_name and
7776 does not lookup the specified DWO file.
7777 This cannot be used to read DWO files.
7779 THIS_CU->cu is always freed when done.
7780 This is done in order to not leave THIS_CU->cu in a state where we have
7781 to care whether it refers to the "main" CU or the DWO CU.
7782 We can revisit this if the data shows there's a performance issue. */
7785 init_cutu_and_read_dies_simple (struct dwarf2_per_cu_data *this_cu,
7786 die_reader_func_ftype *die_reader_func,
7789 init_cutu_and_read_dies_no_follow (this_cu, NULL, die_reader_func, data);
7792 /* Type Unit Groups.
7794 Type Unit Groups are a way to collapse the set of all TUs (type units) into
7795 a more manageable set. The grouping is done by DW_AT_stmt_list entry
7796 so that all types coming from the same compilation (.o file) are grouped
7797 together. A future step could be to put the types in the same symtab as
7798 the CU the types ultimately came from. */
7801 hash_type_unit_group (const void *item)
7803 const struct type_unit_group *tu_group
7804 = (const struct type_unit_group *) item;
7806 return hash_stmt_list_entry (&tu_group->hash);
7810 eq_type_unit_group (const void *item_lhs, const void *item_rhs)
7812 const struct type_unit_group *lhs = (const struct type_unit_group *) item_lhs;
7813 const struct type_unit_group *rhs = (const struct type_unit_group *) item_rhs;
7815 return eq_stmt_list_entry (&lhs->hash, &rhs->hash);
7818 /* Allocate a hash table for type unit groups. */
7821 allocate_type_unit_groups_table (struct objfile *objfile)
7823 return htab_create_alloc_ex (3,
7824 hash_type_unit_group,
7827 &objfile->objfile_obstack,
7828 hashtab_obstack_allocate,
7829 dummy_obstack_deallocate);
7832 /* Type units that don't have DW_AT_stmt_list are grouped into their own
7833 partial symtabs. We combine several TUs per psymtab to not let the size
7834 of any one psymtab grow too big. */
7835 #define NO_STMT_LIST_TYPE_UNIT_PSYMTAB (1 << 31)
7836 #define NO_STMT_LIST_TYPE_UNIT_PSYMTAB_SIZE 10
7838 /* Helper routine for get_type_unit_group.
7839 Create the type_unit_group object used to hold one or more TUs. */
7841 static struct type_unit_group *
7842 create_type_unit_group (struct dwarf2_cu *cu, sect_offset line_offset_struct)
7844 struct dwarf2_per_objfile *dwarf2_per_objfile
7845 = cu->per_cu->dwarf2_per_objfile;
7846 struct objfile *objfile = dwarf2_per_objfile->objfile;
7847 struct dwarf2_per_cu_data *per_cu;
7848 struct type_unit_group *tu_group;
7850 tu_group = OBSTACK_ZALLOC (&objfile->objfile_obstack,
7851 struct type_unit_group);
7852 per_cu = &tu_group->per_cu;
7853 per_cu->dwarf2_per_objfile = dwarf2_per_objfile;
7855 if (dwarf2_per_objfile->using_index)
7857 per_cu->v.quick = OBSTACK_ZALLOC (&objfile->objfile_obstack,
7858 struct dwarf2_per_cu_quick_data);
7862 unsigned int line_offset = to_underlying (line_offset_struct);
7863 struct partial_symtab *pst;
7866 /* Give the symtab a useful name for debug purposes. */
7867 if ((line_offset & NO_STMT_LIST_TYPE_UNIT_PSYMTAB) != 0)
7868 name = string_printf ("<type_units_%d>",
7869 (line_offset & ~NO_STMT_LIST_TYPE_UNIT_PSYMTAB));
7871 name = string_printf ("<type_units_at_0x%x>", line_offset);
7873 pst = create_partial_symtab (per_cu, name.c_str ());
7877 tu_group->hash.dwo_unit = cu->dwo_unit;
7878 tu_group->hash.line_sect_off = line_offset_struct;
7883 /* Look up the type_unit_group for type unit CU, and create it if necessary.
7884 STMT_LIST is a DW_AT_stmt_list attribute. */
7886 static struct type_unit_group *
7887 get_type_unit_group (struct dwarf2_cu *cu, const struct attribute *stmt_list)
7889 struct dwarf2_per_objfile *dwarf2_per_objfile
7890 = cu->per_cu->dwarf2_per_objfile;
7891 struct tu_stats *tu_stats = &dwarf2_per_objfile->tu_stats;
7892 struct type_unit_group *tu_group;
7894 unsigned int line_offset;
7895 struct type_unit_group type_unit_group_for_lookup;
7897 if (dwarf2_per_objfile->type_unit_groups == NULL)
7899 dwarf2_per_objfile->type_unit_groups =
7900 allocate_type_unit_groups_table (dwarf2_per_objfile->objfile);
7903 /* Do we need to create a new group, or can we use an existing one? */
7907 line_offset = DW_UNSND (stmt_list);
7908 ++tu_stats->nr_symtab_sharers;
7912 /* Ugh, no stmt_list. Rare, but we have to handle it.
7913 We can do various things here like create one group per TU or
7914 spread them over multiple groups to split up the expansion work.
7915 To avoid worst case scenarios (too many groups or too large groups)
7916 we, umm, group them in bunches. */
7917 line_offset = (NO_STMT_LIST_TYPE_UNIT_PSYMTAB
7918 | (tu_stats->nr_stmt_less_type_units
7919 / NO_STMT_LIST_TYPE_UNIT_PSYMTAB_SIZE));
7920 ++tu_stats->nr_stmt_less_type_units;
7923 type_unit_group_for_lookup.hash.dwo_unit = cu->dwo_unit;
7924 type_unit_group_for_lookup.hash.line_sect_off = (sect_offset) line_offset;
7925 slot = htab_find_slot (dwarf2_per_objfile->type_unit_groups,
7926 &type_unit_group_for_lookup, INSERT);
7929 tu_group = (struct type_unit_group *) *slot;
7930 gdb_assert (tu_group != NULL);
7934 sect_offset line_offset_struct = (sect_offset) line_offset;
7935 tu_group = create_type_unit_group (cu, line_offset_struct);
7937 ++tu_stats->nr_symtabs;
7943 /* Partial symbol tables. */
7945 /* Create a psymtab named NAME and assign it to PER_CU.
7947 The caller must fill in the following details:
7948 dirname, textlow, texthigh. */
7950 static struct partial_symtab *
7951 create_partial_symtab (struct dwarf2_per_cu_data *per_cu, const char *name)
7953 struct objfile *objfile = per_cu->dwarf2_per_objfile->objfile;
7954 struct partial_symtab *pst;
7956 pst = start_psymtab_common (objfile, name, 0);
7958 pst->psymtabs_addrmap_supported = 1;
7960 /* This is the glue that links PST into GDB's symbol API. */
7961 pst->read_symtab_private = per_cu;
7962 pst->read_symtab = dwarf2_read_symtab;
7963 per_cu->v.psymtab = pst;
7968 /* The DATA object passed to process_psymtab_comp_unit_reader has this
7971 struct process_psymtab_comp_unit_data
7973 /* True if we are reading a DW_TAG_partial_unit. */
7975 int want_partial_unit;
7977 /* The "pretend" language that is used if the CU doesn't declare a
7980 enum language pretend_language;
7983 /* die_reader_func for process_psymtab_comp_unit. */
7986 process_psymtab_comp_unit_reader (const struct die_reader_specs *reader,
7987 const gdb_byte *info_ptr,
7988 struct die_info *comp_unit_die,
7992 struct dwarf2_cu *cu = reader->cu;
7993 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
7994 struct gdbarch *gdbarch = get_objfile_arch (objfile);
7995 struct dwarf2_per_cu_data *per_cu = cu->per_cu;
7997 CORE_ADDR best_lowpc = 0, best_highpc = 0;
7998 struct partial_symtab *pst;
7999 enum pc_bounds_kind cu_bounds_kind;
8000 const char *filename;
8001 struct process_psymtab_comp_unit_data *info
8002 = (struct process_psymtab_comp_unit_data *) data;
8004 if (comp_unit_die->tag == DW_TAG_partial_unit && !info->want_partial_unit)
8007 gdb_assert (! per_cu->is_debug_types);
8009 prepare_one_comp_unit (cu, comp_unit_die, info->pretend_language);
8011 /* Allocate a new partial symbol table structure. */
8012 filename = dwarf2_string_attr (comp_unit_die, DW_AT_name, cu);
8013 if (filename == NULL)
8016 pst = create_partial_symtab (per_cu, filename);
8018 /* This must be done before calling dwarf2_build_include_psymtabs. */
8019 pst->dirname = dwarf2_string_attr (comp_unit_die, DW_AT_comp_dir, cu);
8021 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
8023 dwarf2_find_base_address (comp_unit_die, cu);
8025 /* Possibly set the default values of LOWPC and HIGHPC from
8027 cu_bounds_kind = dwarf2_get_pc_bounds (comp_unit_die, &best_lowpc,
8028 &best_highpc, cu, pst);
8029 if (cu_bounds_kind == PC_BOUNDS_HIGH_LOW && best_lowpc < best_highpc)
8032 = (gdbarch_adjust_dwarf2_addr (gdbarch, best_lowpc + baseaddr)
8035 = (gdbarch_adjust_dwarf2_addr (gdbarch, best_highpc + baseaddr)
8037 /* Store the contiguous range if it is not empty; it can be
8038 empty for CUs with no code. */
8039 addrmap_set_empty (objfile->partial_symtabs->psymtabs_addrmap,
8043 /* Check if comp unit has_children.
8044 If so, read the rest of the partial symbols from this comp unit.
8045 If not, there's no more debug_info for this comp unit. */
8048 struct partial_die_info *first_die;
8049 CORE_ADDR lowpc, highpc;
8051 lowpc = ((CORE_ADDR) -1);
8052 highpc = ((CORE_ADDR) 0);
8054 first_die = load_partial_dies (reader, info_ptr, 1);
8056 scan_partial_symbols (first_die, &lowpc, &highpc,
8057 cu_bounds_kind <= PC_BOUNDS_INVALID, cu);
8059 /* If we didn't find a lowpc, set it to highpc to avoid
8060 complaints from `maint check'. */
8061 if (lowpc == ((CORE_ADDR) -1))
8064 /* If the compilation unit didn't have an explicit address range,
8065 then use the information extracted from its child dies. */
8066 if (cu_bounds_kind <= PC_BOUNDS_INVALID)
8069 best_highpc = highpc;
8072 pst->set_text_low (gdbarch_adjust_dwarf2_addr (gdbarch,
8073 best_lowpc + baseaddr)
8075 pst->set_text_high (gdbarch_adjust_dwarf2_addr (gdbarch,
8076 best_highpc + baseaddr)
8079 end_psymtab_common (objfile, pst);
8081 if (!VEC_empty (dwarf2_per_cu_ptr, cu->per_cu->imported_symtabs))
8084 int len = VEC_length (dwarf2_per_cu_ptr, cu->per_cu->imported_symtabs);
8085 struct dwarf2_per_cu_data *iter;
8087 /* Fill in 'dependencies' here; we fill in 'users' in a
8089 pst->number_of_dependencies = len;
8091 = objfile->partial_symtabs->allocate_dependencies (len);
8093 VEC_iterate (dwarf2_per_cu_ptr, cu->per_cu->imported_symtabs,
8096 pst->dependencies[i] = iter->v.psymtab;
8098 VEC_free (dwarf2_per_cu_ptr, cu->per_cu->imported_symtabs);
8101 /* Get the list of files included in the current compilation unit,
8102 and build a psymtab for each of them. */
8103 dwarf2_build_include_psymtabs (cu, comp_unit_die, pst);
8105 if (dwarf_read_debug)
8106 fprintf_unfiltered (gdb_stdlog,
8107 "Psymtab for %s unit @%s: %s - %s"
8108 ", %d global, %d static syms\n",
8109 per_cu->is_debug_types ? "type" : "comp",
8110 sect_offset_str (per_cu->sect_off),
8111 paddress (gdbarch, pst->text_low (objfile)),
8112 paddress (gdbarch, pst->text_high (objfile)),
8113 pst->n_global_syms, pst->n_static_syms);
8116 /* Subroutine of dwarf2_build_psymtabs_hard to simplify it.
8117 Process compilation unit THIS_CU for a psymtab. */
8120 process_psymtab_comp_unit (struct dwarf2_per_cu_data *this_cu,
8121 int want_partial_unit,
8122 enum language pretend_language)
8124 /* If this compilation unit was already read in, free the
8125 cached copy in order to read it in again. This is
8126 necessary because we skipped some symbols when we first
8127 read in the compilation unit (see load_partial_dies).
8128 This problem could be avoided, but the benefit is unclear. */
8129 if (this_cu->cu != NULL)
8130 free_one_cached_comp_unit (this_cu);
8132 if (this_cu->is_debug_types)
8133 init_cutu_and_read_dies (this_cu, NULL, 0, 0, false,
8134 build_type_psymtabs_reader, NULL);
8137 process_psymtab_comp_unit_data info;
8138 info.want_partial_unit = want_partial_unit;
8139 info.pretend_language = pretend_language;
8140 init_cutu_and_read_dies (this_cu, NULL, 0, 0, false,
8141 process_psymtab_comp_unit_reader, &info);
8144 /* Age out any secondary CUs. */
8145 age_cached_comp_units (this_cu->dwarf2_per_objfile);
8148 /* Reader function for build_type_psymtabs. */
8151 build_type_psymtabs_reader (const struct die_reader_specs *reader,
8152 const gdb_byte *info_ptr,
8153 struct die_info *type_unit_die,
8157 struct dwarf2_per_objfile *dwarf2_per_objfile
8158 = reader->cu->per_cu->dwarf2_per_objfile;
8159 struct objfile *objfile = dwarf2_per_objfile->objfile;
8160 struct dwarf2_cu *cu = reader->cu;
8161 struct dwarf2_per_cu_data *per_cu = cu->per_cu;
8162 struct signatured_type *sig_type;
8163 struct type_unit_group *tu_group;
8164 struct attribute *attr;
8165 struct partial_die_info *first_die;
8166 CORE_ADDR lowpc, highpc;
8167 struct partial_symtab *pst;
8169 gdb_assert (data == NULL);
8170 gdb_assert (per_cu->is_debug_types);
8171 sig_type = (struct signatured_type *) per_cu;
8176 attr = dwarf2_attr_no_follow (type_unit_die, DW_AT_stmt_list);
8177 tu_group = get_type_unit_group (cu, attr);
8179 VEC_safe_push (sig_type_ptr, tu_group->tus, sig_type);
8181 prepare_one_comp_unit (cu, type_unit_die, language_minimal);
8182 pst = create_partial_symtab (per_cu, "");
8185 first_die = load_partial_dies (reader, info_ptr, 1);
8187 lowpc = (CORE_ADDR) -1;
8188 highpc = (CORE_ADDR) 0;
8189 scan_partial_symbols (first_die, &lowpc, &highpc, 0, cu);
8191 end_psymtab_common (objfile, pst);
8194 /* Struct used to sort TUs by their abbreviation table offset. */
8196 struct tu_abbrev_offset
8198 tu_abbrev_offset (signatured_type *sig_type_, sect_offset abbrev_offset_)
8199 : sig_type (sig_type_), abbrev_offset (abbrev_offset_)
8202 signatured_type *sig_type;
8203 sect_offset abbrev_offset;
8206 /* Helper routine for build_type_psymtabs_1, passed to std::sort. */
8209 sort_tu_by_abbrev_offset (const struct tu_abbrev_offset &a,
8210 const struct tu_abbrev_offset &b)
8212 return a.abbrev_offset < b.abbrev_offset;
8215 /* Efficiently read all the type units.
8216 This does the bulk of the work for build_type_psymtabs.
8218 The efficiency is because we sort TUs by the abbrev table they use and
8219 only read each abbrev table once. In one program there are 200K TUs
8220 sharing 8K abbrev tables.
8222 The main purpose of this function is to support building the
8223 dwarf2_per_objfile->type_unit_groups table.
8224 TUs typically share the DW_AT_stmt_list of the CU they came from, so we
8225 can collapse the search space by grouping them by stmt_list.
8226 The savings can be significant, in the same program from above the 200K TUs
8227 share 8K stmt_list tables.
8229 FUNC is expected to call get_type_unit_group, which will create the
8230 struct type_unit_group if necessary and add it to
8231 dwarf2_per_objfile->type_unit_groups. */
8234 build_type_psymtabs_1 (struct dwarf2_per_objfile *dwarf2_per_objfile)
8236 struct tu_stats *tu_stats = &dwarf2_per_objfile->tu_stats;
8237 abbrev_table_up abbrev_table;
8238 sect_offset abbrev_offset;
8240 /* It's up to the caller to not call us multiple times. */
8241 gdb_assert (dwarf2_per_objfile->type_unit_groups == NULL);
8243 if (dwarf2_per_objfile->all_type_units.empty ())
8246 /* TUs typically share abbrev tables, and there can be way more TUs than
8247 abbrev tables. Sort by abbrev table to reduce the number of times we
8248 read each abbrev table in.
8249 Alternatives are to punt or to maintain a cache of abbrev tables.
8250 This is simpler and efficient enough for now.
8252 Later we group TUs by their DW_AT_stmt_list value (as this defines the
8253 symtab to use). Typically TUs with the same abbrev offset have the same
8254 stmt_list value too so in practice this should work well.
8256 The basic algorithm here is:
8258 sort TUs by abbrev table
8259 for each TU with same abbrev table:
8260 read abbrev table if first user
8261 read TU top level DIE
8262 [IWBN if DWO skeletons had DW_AT_stmt_list]
8265 if (dwarf_read_debug)
8266 fprintf_unfiltered (gdb_stdlog, "Building type unit groups ...\n");
8268 /* Sort in a separate table to maintain the order of all_type_units
8269 for .gdb_index: TU indices directly index all_type_units. */
8270 std::vector<tu_abbrev_offset> sorted_by_abbrev;
8271 sorted_by_abbrev.reserve (dwarf2_per_objfile->all_type_units.size ());
8273 for (signatured_type *sig_type : dwarf2_per_objfile->all_type_units)
8274 sorted_by_abbrev.emplace_back
8275 (sig_type, read_abbrev_offset (dwarf2_per_objfile,
8276 sig_type->per_cu.section,
8277 sig_type->per_cu.sect_off));
8279 std::sort (sorted_by_abbrev.begin (), sorted_by_abbrev.end (),
8280 sort_tu_by_abbrev_offset);
8282 abbrev_offset = (sect_offset) ~(unsigned) 0;
8284 for (const tu_abbrev_offset &tu : sorted_by_abbrev)
8286 /* Switch to the next abbrev table if necessary. */
8287 if (abbrev_table == NULL
8288 || tu.abbrev_offset != abbrev_offset)
8290 abbrev_offset = tu.abbrev_offset;
8292 abbrev_table_read_table (dwarf2_per_objfile,
8293 &dwarf2_per_objfile->abbrev,
8295 ++tu_stats->nr_uniq_abbrev_tables;
8298 init_cutu_and_read_dies (&tu.sig_type->per_cu, abbrev_table.get (),
8299 0, 0, false, build_type_psymtabs_reader, NULL);
8303 /* Print collected type unit statistics. */
8306 print_tu_stats (struct dwarf2_per_objfile *dwarf2_per_objfile)
8308 struct tu_stats *tu_stats = &dwarf2_per_objfile->tu_stats;
8310 fprintf_unfiltered (gdb_stdlog, "Type unit statistics:\n");
8311 fprintf_unfiltered (gdb_stdlog, " %zu TUs\n",
8312 dwarf2_per_objfile->all_type_units.size ());
8313 fprintf_unfiltered (gdb_stdlog, " %d uniq abbrev tables\n",
8314 tu_stats->nr_uniq_abbrev_tables);
8315 fprintf_unfiltered (gdb_stdlog, " %d symtabs from stmt_list entries\n",
8316 tu_stats->nr_symtabs);
8317 fprintf_unfiltered (gdb_stdlog, " %d symtab sharers\n",
8318 tu_stats->nr_symtab_sharers);
8319 fprintf_unfiltered (gdb_stdlog, " %d type units without a stmt_list\n",
8320 tu_stats->nr_stmt_less_type_units);
8321 fprintf_unfiltered (gdb_stdlog, " %d all_type_units reallocs\n",
8322 tu_stats->nr_all_type_units_reallocs);
8325 /* Traversal function for build_type_psymtabs. */
8328 build_type_psymtab_dependencies (void **slot, void *info)
8330 struct dwarf2_per_objfile *dwarf2_per_objfile
8331 = (struct dwarf2_per_objfile *) info;
8332 struct objfile *objfile = dwarf2_per_objfile->objfile;
8333 struct type_unit_group *tu_group = (struct type_unit_group *) *slot;
8334 struct dwarf2_per_cu_data *per_cu = &tu_group->per_cu;
8335 struct partial_symtab *pst = per_cu->v.psymtab;
8336 int len = VEC_length (sig_type_ptr, tu_group->tus);
8337 struct signatured_type *iter;
8340 gdb_assert (len > 0);
8341 gdb_assert (IS_TYPE_UNIT_GROUP (per_cu));
8343 pst->number_of_dependencies = len;
8344 pst->dependencies = objfile->partial_symtabs->allocate_dependencies (len);
8346 VEC_iterate (sig_type_ptr, tu_group->tus, i, iter);
8349 gdb_assert (iter->per_cu.is_debug_types);
8350 pst->dependencies[i] = iter->per_cu.v.psymtab;
8351 iter->type_unit_group = tu_group;
8354 VEC_free (sig_type_ptr, tu_group->tus);
8359 /* Subroutine of dwarf2_build_psymtabs_hard to simplify it.
8360 Build partial symbol tables for the .debug_types comp-units. */
8363 build_type_psymtabs (struct dwarf2_per_objfile *dwarf2_per_objfile)
8365 if (! create_all_type_units (dwarf2_per_objfile))
8368 build_type_psymtabs_1 (dwarf2_per_objfile);
8371 /* Traversal function for process_skeletonless_type_unit.
8372 Read a TU in a DWO file and build partial symbols for it. */
8375 process_skeletonless_type_unit (void **slot, void *info)
8377 struct dwo_unit *dwo_unit = (struct dwo_unit *) *slot;
8378 struct dwarf2_per_objfile *dwarf2_per_objfile
8379 = (struct dwarf2_per_objfile *) info;
8380 struct signatured_type find_entry, *entry;
8382 /* If this TU doesn't exist in the global table, add it and read it in. */
8384 if (dwarf2_per_objfile->signatured_types == NULL)
8386 dwarf2_per_objfile->signatured_types
8387 = allocate_signatured_type_table (dwarf2_per_objfile->objfile);
8390 find_entry.signature = dwo_unit->signature;
8391 slot = htab_find_slot (dwarf2_per_objfile->signatured_types, &find_entry,
8393 /* If we've already seen this type there's nothing to do. What's happening
8394 is we're doing our own version of comdat-folding here. */
8398 /* This does the job that create_all_type_units would have done for
8400 entry = add_type_unit (dwarf2_per_objfile, dwo_unit->signature, slot);
8401 fill_in_sig_entry_from_dwo_entry (dwarf2_per_objfile, entry, dwo_unit);
8404 /* This does the job that build_type_psymtabs_1 would have done. */
8405 init_cutu_and_read_dies (&entry->per_cu, NULL, 0, 0, false,
8406 build_type_psymtabs_reader, NULL);
8411 /* Traversal function for process_skeletonless_type_units. */
8414 process_dwo_file_for_skeletonless_type_units (void **slot, void *info)
8416 struct dwo_file *dwo_file = (struct dwo_file *) *slot;
8418 if (dwo_file->tus != NULL)
8420 htab_traverse_noresize (dwo_file->tus,
8421 process_skeletonless_type_unit, info);
8427 /* Scan all TUs of DWO files, verifying we've processed them.
8428 This is needed in case a TU was emitted without its skeleton.
8429 Note: This can't be done until we know what all the DWO files are. */
8432 process_skeletonless_type_units (struct dwarf2_per_objfile *dwarf2_per_objfile)
8434 /* Skeletonless TUs in DWP files without .gdb_index is not supported yet. */
8435 if (get_dwp_file (dwarf2_per_objfile) == NULL
8436 && dwarf2_per_objfile->dwo_files != NULL)
8438 htab_traverse_noresize (dwarf2_per_objfile->dwo_files,
8439 process_dwo_file_for_skeletonless_type_units,
8440 dwarf2_per_objfile);
8444 /* Compute the 'user' field for each psymtab in DWARF2_PER_OBJFILE. */
8447 set_partial_user (struct dwarf2_per_objfile *dwarf2_per_objfile)
8449 for (dwarf2_per_cu_data *per_cu : dwarf2_per_objfile->all_comp_units)
8451 struct partial_symtab *pst = per_cu->v.psymtab;
8456 for (int j = 0; j < pst->number_of_dependencies; ++j)
8458 /* Set the 'user' field only if it is not already set. */
8459 if (pst->dependencies[j]->user == NULL)
8460 pst->dependencies[j]->user = pst;
8465 /* Build the partial symbol table by doing a quick pass through the
8466 .debug_info and .debug_abbrev sections. */
8469 dwarf2_build_psymtabs_hard (struct dwarf2_per_objfile *dwarf2_per_objfile)
8471 struct objfile *objfile = dwarf2_per_objfile->objfile;
8473 if (dwarf_read_debug)
8475 fprintf_unfiltered (gdb_stdlog, "Building psymtabs of objfile %s ...\n",
8476 objfile_name (objfile));
8479 dwarf2_per_objfile->reading_partial_symbols = 1;
8481 dwarf2_read_section (objfile, &dwarf2_per_objfile->info);
8483 /* Any cached compilation units will be linked by the per-objfile
8484 read_in_chain. Make sure to free them when we're done. */
8485 free_cached_comp_units freer (dwarf2_per_objfile);
8487 build_type_psymtabs (dwarf2_per_objfile);
8489 create_all_comp_units (dwarf2_per_objfile);
8491 /* Create a temporary address map on a temporary obstack. We later
8492 copy this to the final obstack. */
8493 auto_obstack temp_obstack;
8495 scoped_restore save_psymtabs_addrmap
8496 = make_scoped_restore (&objfile->partial_symtabs->psymtabs_addrmap,
8497 addrmap_create_mutable (&temp_obstack));
8499 for (dwarf2_per_cu_data *per_cu : dwarf2_per_objfile->all_comp_units)
8500 process_psymtab_comp_unit (per_cu, 0, language_minimal);
8502 /* This has to wait until we read the CUs, we need the list of DWOs. */
8503 process_skeletonless_type_units (dwarf2_per_objfile);
8505 /* Now that all TUs have been processed we can fill in the dependencies. */
8506 if (dwarf2_per_objfile->type_unit_groups != NULL)
8508 htab_traverse_noresize (dwarf2_per_objfile->type_unit_groups,
8509 build_type_psymtab_dependencies, dwarf2_per_objfile);
8512 if (dwarf_read_debug)
8513 print_tu_stats (dwarf2_per_objfile);
8515 set_partial_user (dwarf2_per_objfile);
8517 objfile->partial_symtabs->psymtabs_addrmap
8518 = addrmap_create_fixed (objfile->partial_symtabs->psymtabs_addrmap,
8519 objfile->partial_symtabs->obstack ());
8520 /* At this point we want to keep the address map. */
8521 save_psymtabs_addrmap.release ();
8523 if (dwarf_read_debug)
8524 fprintf_unfiltered (gdb_stdlog, "Done building psymtabs of %s\n",
8525 objfile_name (objfile));
8528 /* die_reader_func for load_partial_comp_unit. */
8531 load_partial_comp_unit_reader (const struct die_reader_specs *reader,
8532 const gdb_byte *info_ptr,
8533 struct die_info *comp_unit_die,
8537 struct dwarf2_cu *cu = reader->cu;
8539 prepare_one_comp_unit (cu, comp_unit_die, language_minimal);
8541 /* Check if comp unit has_children.
8542 If so, read the rest of the partial symbols from this comp unit.
8543 If not, there's no more debug_info for this comp unit. */
8545 load_partial_dies (reader, info_ptr, 0);
8548 /* Load the partial DIEs for a secondary CU into memory.
8549 This is also used when rereading a primary CU with load_all_dies. */
8552 load_partial_comp_unit (struct dwarf2_per_cu_data *this_cu)
8554 init_cutu_and_read_dies (this_cu, NULL, 1, 1, false,
8555 load_partial_comp_unit_reader, NULL);
8559 read_comp_units_from_section (struct dwarf2_per_objfile *dwarf2_per_objfile,
8560 struct dwarf2_section_info *section,
8561 struct dwarf2_section_info *abbrev_section,
8562 unsigned int is_dwz)
8564 const gdb_byte *info_ptr;
8565 struct objfile *objfile = dwarf2_per_objfile->objfile;
8567 if (dwarf_read_debug)
8568 fprintf_unfiltered (gdb_stdlog, "Reading %s for %s\n",
8569 get_section_name (section),
8570 get_section_file_name (section));
8572 dwarf2_read_section (objfile, section);
8574 info_ptr = section->buffer;
8576 while (info_ptr < section->buffer + section->size)
8578 struct dwarf2_per_cu_data *this_cu;
8580 sect_offset sect_off = (sect_offset) (info_ptr - section->buffer);
8582 comp_unit_head cu_header;
8583 read_and_check_comp_unit_head (dwarf2_per_objfile, &cu_header, section,
8584 abbrev_section, info_ptr,
8585 rcuh_kind::COMPILE);
8587 /* Save the compilation unit for later lookup. */
8588 if (cu_header.unit_type != DW_UT_type)
8590 this_cu = XOBNEW (&objfile->objfile_obstack,
8591 struct dwarf2_per_cu_data);
8592 memset (this_cu, 0, sizeof (*this_cu));
8596 auto sig_type = XOBNEW (&objfile->objfile_obstack,
8597 struct signatured_type);
8598 memset (sig_type, 0, sizeof (*sig_type));
8599 sig_type->signature = cu_header.signature;
8600 sig_type->type_offset_in_tu = cu_header.type_cu_offset_in_tu;
8601 this_cu = &sig_type->per_cu;
8603 this_cu->is_debug_types = (cu_header.unit_type == DW_UT_type);
8604 this_cu->sect_off = sect_off;
8605 this_cu->length = cu_header.length + cu_header.initial_length_size;
8606 this_cu->is_dwz = is_dwz;
8607 this_cu->dwarf2_per_objfile = dwarf2_per_objfile;
8608 this_cu->section = section;
8610 dwarf2_per_objfile->all_comp_units.push_back (this_cu);
8612 info_ptr = info_ptr + this_cu->length;
8616 /* Create a list of all compilation units in OBJFILE.
8617 This is only done for -readnow and building partial symtabs. */
8620 create_all_comp_units (struct dwarf2_per_objfile *dwarf2_per_objfile)
8622 gdb_assert (dwarf2_per_objfile->all_comp_units.empty ());
8623 read_comp_units_from_section (dwarf2_per_objfile, &dwarf2_per_objfile->info,
8624 &dwarf2_per_objfile->abbrev, 0);
8626 dwz_file *dwz = dwarf2_get_dwz_file (dwarf2_per_objfile);
8628 read_comp_units_from_section (dwarf2_per_objfile, &dwz->info, &dwz->abbrev,
8632 /* Process all loaded DIEs for compilation unit CU, starting at
8633 FIRST_DIE. The caller should pass SET_ADDRMAP == 1 if the compilation
8634 unit DIE did not have PC info (DW_AT_low_pc and DW_AT_high_pc, or
8635 DW_AT_ranges). See the comments of add_partial_subprogram on how
8636 SET_ADDRMAP is used and how *LOWPC and *HIGHPC are updated. */
8639 scan_partial_symbols (struct partial_die_info *first_die, CORE_ADDR *lowpc,
8640 CORE_ADDR *highpc, int set_addrmap,
8641 struct dwarf2_cu *cu)
8643 struct partial_die_info *pdi;
8645 /* Now, march along the PDI's, descending into ones which have
8646 interesting children but skipping the children of the other ones,
8647 until we reach the end of the compilation unit. */
8655 /* Anonymous namespaces or modules have no name but have interesting
8656 children, so we need to look at them. Ditto for anonymous
8659 if (pdi->name != NULL || pdi->tag == DW_TAG_namespace
8660 || pdi->tag == DW_TAG_module || pdi->tag == DW_TAG_enumeration_type
8661 || pdi->tag == DW_TAG_imported_unit
8662 || pdi->tag == DW_TAG_inlined_subroutine)
8666 case DW_TAG_subprogram:
8667 case DW_TAG_inlined_subroutine:
8668 add_partial_subprogram (pdi, lowpc, highpc, set_addrmap, cu);
8670 case DW_TAG_constant:
8671 case DW_TAG_variable:
8672 case DW_TAG_typedef:
8673 case DW_TAG_union_type:
8674 if (!pdi->is_declaration)
8676 add_partial_symbol (pdi, cu);
8679 case DW_TAG_class_type:
8680 case DW_TAG_interface_type:
8681 case DW_TAG_structure_type:
8682 if (!pdi->is_declaration)
8684 add_partial_symbol (pdi, cu);
8686 if ((cu->language == language_rust
8687 || cu->language == language_cplus) && pdi->has_children)
8688 scan_partial_symbols (pdi->die_child, lowpc, highpc,
8691 case DW_TAG_enumeration_type:
8692 if (!pdi->is_declaration)
8693 add_partial_enumeration (pdi, cu);
8695 case DW_TAG_base_type:
8696 case DW_TAG_subrange_type:
8697 /* File scope base type definitions are added to the partial
8699 add_partial_symbol (pdi, cu);
8701 case DW_TAG_namespace:
8702 add_partial_namespace (pdi, lowpc, highpc, set_addrmap, cu);
8705 add_partial_module (pdi, lowpc, highpc, set_addrmap, cu);
8707 case DW_TAG_imported_unit:
8709 struct dwarf2_per_cu_data *per_cu;
8711 /* For now we don't handle imported units in type units. */
8712 if (cu->per_cu->is_debug_types)
8714 error (_("Dwarf Error: DW_TAG_imported_unit is not"
8715 " supported in type units [in module %s]"),
8716 objfile_name (cu->per_cu->dwarf2_per_objfile->objfile));
8719 per_cu = dwarf2_find_containing_comp_unit
8720 (pdi->d.sect_off, pdi->is_dwz,
8721 cu->per_cu->dwarf2_per_objfile);
8723 /* Go read the partial unit, if needed. */
8724 if (per_cu->v.psymtab == NULL)
8725 process_psymtab_comp_unit (per_cu, 1, cu->language);
8727 VEC_safe_push (dwarf2_per_cu_ptr,
8728 cu->per_cu->imported_symtabs, per_cu);
8731 case DW_TAG_imported_declaration:
8732 add_partial_symbol (pdi, cu);
8739 /* If the die has a sibling, skip to the sibling. */
8741 pdi = pdi->die_sibling;
8745 /* Functions used to compute the fully scoped name of a partial DIE.
8747 Normally, this is simple. For C++, the parent DIE's fully scoped
8748 name is concatenated with "::" and the partial DIE's name.
8749 Enumerators are an exception; they use the scope of their parent
8750 enumeration type, i.e. the name of the enumeration type is not
8751 prepended to the enumerator.
8753 There are two complexities. One is DW_AT_specification; in this
8754 case "parent" means the parent of the target of the specification,
8755 instead of the direct parent of the DIE. The other is compilers
8756 which do not emit DW_TAG_namespace; in this case we try to guess
8757 the fully qualified name of structure types from their members'
8758 linkage names. This must be done using the DIE's children rather
8759 than the children of any DW_AT_specification target. We only need
8760 to do this for structures at the top level, i.e. if the target of
8761 any DW_AT_specification (if any; otherwise the DIE itself) does not
8764 /* Compute the scope prefix associated with PDI's parent, in
8765 compilation unit CU. The result will be allocated on CU's
8766 comp_unit_obstack, or a copy of the already allocated PDI->NAME
8767 field. NULL is returned if no prefix is necessary. */
8769 partial_die_parent_scope (struct partial_die_info *pdi,
8770 struct dwarf2_cu *cu)
8772 const char *grandparent_scope;
8773 struct partial_die_info *parent, *real_pdi;
8775 /* We need to look at our parent DIE; if we have a DW_AT_specification,
8776 then this means the parent of the specification DIE. */
8779 while (real_pdi->has_specification)
8781 auto res = find_partial_die (real_pdi->spec_offset,
8782 real_pdi->spec_is_dwz, cu);
8787 parent = real_pdi->die_parent;
8791 if (parent->scope_set)
8792 return parent->scope;
8796 grandparent_scope = partial_die_parent_scope (parent, cu);
8798 /* GCC 4.0 and 4.1 had a bug (PR c++/28460) where they generated bogus
8799 DW_TAG_namespace DIEs with a name of "::" for the global namespace.
8800 Work around this problem here. */
8801 if (cu->language == language_cplus
8802 && parent->tag == DW_TAG_namespace
8803 && strcmp (parent->name, "::") == 0
8804 && grandparent_scope == NULL)
8806 parent->scope = NULL;
8807 parent->scope_set = 1;
8811 if (pdi->tag == DW_TAG_enumerator)
8812 /* Enumerators should not get the name of the enumeration as a prefix. */
8813 parent->scope = grandparent_scope;
8814 else if (parent->tag == DW_TAG_namespace
8815 || parent->tag == DW_TAG_module
8816 || parent->tag == DW_TAG_structure_type
8817 || parent->tag == DW_TAG_class_type
8818 || parent->tag == DW_TAG_interface_type
8819 || parent->tag == DW_TAG_union_type
8820 || parent->tag == DW_TAG_enumeration_type)
8822 if (grandparent_scope == NULL)
8823 parent->scope = parent->name;
8825 parent->scope = typename_concat (&cu->comp_unit_obstack,
8827 parent->name, 0, cu);
8831 /* FIXME drow/2004-04-01: What should we be doing with
8832 function-local names? For partial symbols, we should probably be
8834 complaint (_("unhandled containing DIE tag %s for DIE at %s"),
8835 dwarf_tag_name (parent->tag),
8836 sect_offset_str (pdi->sect_off));
8837 parent->scope = grandparent_scope;
8840 parent->scope_set = 1;
8841 return parent->scope;
8844 /* Return the fully scoped name associated with PDI, from compilation unit
8845 CU. The result will be allocated with malloc. */
8848 partial_die_full_name (struct partial_die_info *pdi,
8849 struct dwarf2_cu *cu)
8851 const char *parent_scope;
8853 /* If this is a template instantiation, we can not work out the
8854 template arguments from partial DIEs. So, unfortunately, we have
8855 to go through the full DIEs. At least any work we do building
8856 types here will be reused if full symbols are loaded later. */
8857 if (pdi->has_template_arguments)
8861 if (pdi->name != NULL && strchr (pdi->name, '<') == NULL)
8863 struct die_info *die;
8864 struct attribute attr;
8865 struct dwarf2_cu *ref_cu = cu;
8867 /* DW_FORM_ref_addr is using section offset. */
8868 attr.name = (enum dwarf_attribute) 0;
8869 attr.form = DW_FORM_ref_addr;
8870 attr.u.unsnd = to_underlying (pdi->sect_off);
8871 die = follow_die_ref (NULL, &attr, &ref_cu);
8873 return xstrdup (dwarf2_full_name (NULL, die, ref_cu));
8877 parent_scope = partial_die_parent_scope (pdi, cu);
8878 if (parent_scope == NULL)
8881 return typename_concat (NULL, parent_scope, pdi->name, 0, cu);
8885 add_partial_symbol (struct partial_die_info *pdi, struct dwarf2_cu *cu)
8887 struct dwarf2_per_objfile *dwarf2_per_objfile
8888 = cu->per_cu->dwarf2_per_objfile;
8889 struct objfile *objfile = dwarf2_per_objfile->objfile;
8890 struct gdbarch *gdbarch = get_objfile_arch (objfile);
8892 const char *actual_name = NULL;
8894 char *built_actual_name;
8896 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
8898 built_actual_name = partial_die_full_name (pdi, cu);
8899 if (built_actual_name != NULL)
8900 actual_name = built_actual_name;
8902 if (actual_name == NULL)
8903 actual_name = pdi->name;
8907 case DW_TAG_inlined_subroutine:
8908 case DW_TAG_subprogram:
8909 addr = (gdbarch_adjust_dwarf2_addr (gdbarch, pdi->lowpc + baseaddr)
8911 if (pdi->is_external || cu->language == language_ada)
8913 /* brobecker/2007-12-26: Normally, only "external" DIEs are part
8914 of the global scope. But in Ada, we want to be able to access
8915 nested procedures globally. So all Ada subprograms are stored
8916 in the global scope. */
8917 add_psymbol_to_list (actual_name, strlen (actual_name),
8918 built_actual_name != NULL,
8919 VAR_DOMAIN, LOC_BLOCK,
8920 SECT_OFF_TEXT (objfile),
8921 psymbol_placement::GLOBAL,
8923 cu->language, objfile);
8927 add_psymbol_to_list (actual_name, strlen (actual_name),
8928 built_actual_name != NULL,
8929 VAR_DOMAIN, LOC_BLOCK,
8930 SECT_OFF_TEXT (objfile),
8931 psymbol_placement::STATIC,
8932 addr, cu->language, objfile);
8935 if (pdi->main_subprogram && actual_name != NULL)
8936 set_objfile_main_name (objfile, actual_name, cu->language);
8938 case DW_TAG_constant:
8939 add_psymbol_to_list (actual_name, strlen (actual_name),
8940 built_actual_name != NULL, VAR_DOMAIN, LOC_STATIC,
8941 -1, (pdi->is_external
8942 ? psymbol_placement::GLOBAL
8943 : psymbol_placement::STATIC),
8944 0, cu->language, objfile);
8946 case DW_TAG_variable:
8948 addr = decode_locdesc (pdi->d.locdesc, cu);
8952 && !dwarf2_per_objfile->has_section_at_zero)
8954 /* A global or static variable may also have been stripped
8955 out by the linker if unused, in which case its address
8956 will be nullified; do not add such variables into partial
8957 symbol table then. */
8959 else if (pdi->is_external)
8962 Don't enter into the minimal symbol tables as there is
8963 a minimal symbol table entry from the ELF symbols already.
8964 Enter into partial symbol table if it has a location
8965 descriptor or a type.
8966 If the location descriptor is missing, new_symbol will create
8967 a LOC_UNRESOLVED symbol, the address of the variable will then
8968 be determined from the minimal symbol table whenever the variable
8970 The address for the partial symbol table entry is not
8971 used by GDB, but it comes in handy for debugging partial symbol
8974 if (pdi->d.locdesc || pdi->has_type)
8975 add_psymbol_to_list (actual_name, strlen (actual_name),
8976 built_actual_name != NULL,
8977 VAR_DOMAIN, LOC_STATIC,
8978 SECT_OFF_TEXT (objfile),
8979 psymbol_placement::GLOBAL,
8980 addr, cu->language, objfile);
8984 int has_loc = pdi->d.locdesc != NULL;
8986 /* Static Variable. Skip symbols whose value we cannot know (those
8987 without location descriptors or constant values). */
8988 if (!has_loc && !pdi->has_const_value)
8990 xfree (built_actual_name);
8994 add_psymbol_to_list (actual_name, strlen (actual_name),
8995 built_actual_name != NULL,
8996 VAR_DOMAIN, LOC_STATIC,
8997 SECT_OFF_TEXT (objfile),
8998 psymbol_placement::STATIC,
9000 cu->language, objfile);
9003 case DW_TAG_typedef:
9004 case DW_TAG_base_type:
9005 case DW_TAG_subrange_type:
9006 add_psymbol_to_list (actual_name, strlen (actual_name),
9007 built_actual_name != NULL,
9008 VAR_DOMAIN, LOC_TYPEDEF, -1,
9009 psymbol_placement::STATIC,
9010 0, cu->language, objfile);
9012 case DW_TAG_imported_declaration:
9013 case DW_TAG_namespace:
9014 add_psymbol_to_list (actual_name, strlen (actual_name),
9015 built_actual_name != NULL,
9016 VAR_DOMAIN, LOC_TYPEDEF, -1,
9017 psymbol_placement::GLOBAL,
9018 0, cu->language, objfile);
9021 add_psymbol_to_list (actual_name, strlen (actual_name),
9022 built_actual_name != NULL,
9023 MODULE_DOMAIN, LOC_TYPEDEF, -1,
9024 psymbol_placement::GLOBAL,
9025 0, cu->language, objfile);
9027 case DW_TAG_class_type:
9028 case DW_TAG_interface_type:
9029 case DW_TAG_structure_type:
9030 case DW_TAG_union_type:
9031 case DW_TAG_enumeration_type:
9032 /* Skip external references. The DWARF standard says in the section
9033 about "Structure, Union, and Class Type Entries": "An incomplete
9034 structure, union or class type is represented by a structure,
9035 union or class entry that does not have a byte size attribute
9036 and that has a DW_AT_declaration attribute." */
9037 if (!pdi->has_byte_size && pdi->is_declaration)
9039 xfree (built_actual_name);
9043 /* NOTE: carlton/2003-10-07: See comment in new_symbol about
9044 static vs. global. */
9045 add_psymbol_to_list (actual_name, strlen (actual_name),
9046 built_actual_name != NULL,
9047 STRUCT_DOMAIN, LOC_TYPEDEF, -1,
9048 cu->language == language_cplus
9049 ? psymbol_placement::GLOBAL
9050 : psymbol_placement::STATIC,
9051 0, cu->language, objfile);
9054 case DW_TAG_enumerator:
9055 add_psymbol_to_list (actual_name, strlen (actual_name),
9056 built_actual_name != NULL,
9057 VAR_DOMAIN, LOC_CONST, -1,
9058 cu->language == language_cplus
9059 ? psymbol_placement::GLOBAL
9060 : psymbol_placement::STATIC,
9061 0, cu->language, objfile);
9067 xfree (built_actual_name);
9070 /* Read a partial die corresponding to a namespace; also, add a symbol
9071 corresponding to that namespace to the symbol table. NAMESPACE is
9072 the name of the enclosing namespace. */
9075 add_partial_namespace (struct partial_die_info *pdi,
9076 CORE_ADDR *lowpc, CORE_ADDR *highpc,
9077 int set_addrmap, struct dwarf2_cu *cu)
9079 /* Add a symbol for the namespace. */
9081 add_partial_symbol (pdi, cu);
9083 /* Now scan partial symbols in that namespace. */
9085 if (pdi->has_children)
9086 scan_partial_symbols (pdi->die_child, lowpc, highpc, set_addrmap, cu);
9089 /* Read a partial die corresponding to a Fortran module. */
9092 add_partial_module (struct partial_die_info *pdi, CORE_ADDR *lowpc,
9093 CORE_ADDR *highpc, int set_addrmap, struct dwarf2_cu *cu)
9095 /* Add a symbol for the namespace. */
9097 add_partial_symbol (pdi, cu);
9099 /* Now scan partial symbols in that module. */
9101 if (pdi->has_children)
9102 scan_partial_symbols (pdi->die_child, lowpc, highpc, set_addrmap, cu);
9105 /* Read a partial die corresponding to a subprogram or an inlined
9106 subprogram and create a partial symbol for that subprogram.
9107 When the CU language allows it, this routine also defines a partial
9108 symbol for each nested subprogram that this subprogram contains.
9109 If SET_ADDRMAP is true, record the covered ranges in the addrmap.
9110 Set *LOWPC and *HIGHPC to the lowest and highest PC values found in PDI.
9112 PDI may also be a lexical block, in which case we simply search
9113 recursively for subprograms defined inside that lexical block.
9114 Again, this is only performed when the CU language allows this
9115 type of definitions. */
9118 add_partial_subprogram (struct partial_die_info *pdi,
9119 CORE_ADDR *lowpc, CORE_ADDR *highpc,
9120 int set_addrmap, struct dwarf2_cu *cu)
9122 if (pdi->tag == DW_TAG_subprogram || pdi->tag == DW_TAG_inlined_subroutine)
9124 if (pdi->has_pc_info)
9126 if (pdi->lowpc < *lowpc)
9127 *lowpc = pdi->lowpc;
9128 if (pdi->highpc > *highpc)
9129 *highpc = pdi->highpc;
9132 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
9133 struct gdbarch *gdbarch = get_objfile_arch (objfile);
9135 CORE_ADDR this_highpc;
9136 CORE_ADDR this_lowpc;
9138 baseaddr = ANOFFSET (objfile->section_offsets,
9139 SECT_OFF_TEXT (objfile));
9141 = (gdbarch_adjust_dwarf2_addr (gdbarch,
9142 pdi->lowpc + baseaddr)
9145 = (gdbarch_adjust_dwarf2_addr (gdbarch,
9146 pdi->highpc + baseaddr)
9148 addrmap_set_empty (objfile->partial_symtabs->psymtabs_addrmap,
9149 this_lowpc, this_highpc - 1,
9150 cu->per_cu->v.psymtab);
9154 if (pdi->has_pc_info || (!pdi->is_external && pdi->may_be_inlined))
9156 if (!pdi->is_declaration)
9157 /* Ignore subprogram DIEs that do not have a name, they are
9158 illegal. Do not emit a complaint at this point, we will
9159 do so when we convert this psymtab into a symtab. */
9161 add_partial_symbol (pdi, cu);
9165 if (! pdi->has_children)
9168 if (cu->language == language_ada)
9170 pdi = pdi->die_child;
9174 if (pdi->tag == DW_TAG_subprogram
9175 || pdi->tag == DW_TAG_inlined_subroutine
9176 || pdi->tag == DW_TAG_lexical_block)
9177 add_partial_subprogram (pdi, lowpc, highpc, set_addrmap, cu);
9178 pdi = pdi->die_sibling;
9183 /* Read a partial die corresponding to an enumeration type. */
9186 add_partial_enumeration (struct partial_die_info *enum_pdi,
9187 struct dwarf2_cu *cu)
9189 struct partial_die_info *pdi;
9191 if (enum_pdi->name != NULL)
9192 add_partial_symbol (enum_pdi, cu);
9194 pdi = enum_pdi->die_child;
9197 if (pdi->tag != DW_TAG_enumerator || pdi->name == NULL)
9198 complaint (_("malformed enumerator DIE ignored"));
9200 add_partial_symbol (pdi, cu);
9201 pdi = pdi->die_sibling;
9205 /* Return the initial uleb128 in the die at INFO_PTR. */
9208 peek_abbrev_code (bfd *abfd, const gdb_byte *info_ptr)
9210 unsigned int bytes_read;
9212 return read_unsigned_leb128 (abfd, info_ptr, &bytes_read);
9215 /* Read the initial uleb128 in the die at INFO_PTR in compilation unit
9216 READER::CU. Use READER::ABBREV_TABLE to lookup any abbreviation.
9218 Return the corresponding abbrev, or NULL if the number is zero (indicating
9219 an empty DIE). In either case *BYTES_READ will be set to the length of
9220 the initial number. */
9222 static struct abbrev_info *
9223 peek_die_abbrev (const die_reader_specs &reader,
9224 const gdb_byte *info_ptr, unsigned int *bytes_read)
9226 dwarf2_cu *cu = reader.cu;
9227 bfd *abfd = cu->per_cu->dwarf2_per_objfile->objfile->obfd;
9228 unsigned int abbrev_number
9229 = read_unsigned_leb128 (abfd, info_ptr, bytes_read);
9231 if (abbrev_number == 0)
9234 abbrev_info *abbrev = reader.abbrev_table->lookup_abbrev (abbrev_number);
9237 error (_("Dwarf Error: Could not find abbrev number %d in %s"
9238 " at offset %s [in module %s]"),
9239 abbrev_number, cu->per_cu->is_debug_types ? "TU" : "CU",
9240 sect_offset_str (cu->header.sect_off), bfd_get_filename (abfd));
9246 /* Scan the debug information for CU starting at INFO_PTR in buffer BUFFER.
9247 Returns a pointer to the end of a series of DIEs, terminated by an empty
9248 DIE. Any children of the skipped DIEs will also be skipped. */
9250 static const gdb_byte *
9251 skip_children (const struct die_reader_specs *reader, const gdb_byte *info_ptr)
9255 unsigned int bytes_read;
9256 abbrev_info *abbrev = peek_die_abbrev (*reader, info_ptr, &bytes_read);
9259 return info_ptr + bytes_read;
9261 info_ptr = skip_one_die (reader, info_ptr + bytes_read, abbrev);
9265 /* Scan the debug information for CU starting at INFO_PTR in buffer BUFFER.
9266 INFO_PTR should point just after the initial uleb128 of a DIE, and the
9267 abbrev corresponding to that skipped uleb128 should be passed in
9268 ABBREV. Returns a pointer to this DIE's sibling, skipping any
9271 static const gdb_byte *
9272 skip_one_die (const struct die_reader_specs *reader, const gdb_byte *info_ptr,
9273 struct abbrev_info *abbrev)
9275 unsigned int bytes_read;
9276 struct attribute attr;
9277 bfd *abfd = reader->abfd;
9278 struct dwarf2_cu *cu = reader->cu;
9279 const gdb_byte *buffer = reader->buffer;
9280 const gdb_byte *buffer_end = reader->buffer_end;
9281 unsigned int form, i;
9283 for (i = 0; i < abbrev->num_attrs; i++)
9285 /* The only abbrev we care about is DW_AT_sibling. */
9286 if (abbrev->attrs[i].name == DW_AT_sibling)
9288 read_attribute (reader, &attr, &abbrev->attrs[i], info_ptr);
9289 if (attr.form == DW_FORM_ref_addr)
9290 complaint (_("ignoring absolute DW_AT_sibling"));
9293 sect_offset off = dwarf2_get_ref_die_offset (&attr);
9294 const gdb_byte *sibling_ptr = buffer + to_underlying (off);
9296 if (sibling_ptr < info_ptr)
9297 complaint (_("DW_AT_sibling points backwards"));
9298 else if (sibling_ptr > reader->buffer_end)
9299 dwarf2_section_buffer_overflow_complaint (reader->die_section);
9305 /* If it isn't DW_AT_sibling, skip this attribute. */
9306 form = abbrev->attrs[i].form;
9310 case DW_FORM_ref_addr:
9311 /* In DWARF 2, DW_FORM_ref_addr is address sized; in DWARF 3
9312 and later it is offset sized. */
9313 if (cu->header.version == 2)
9314 info_ptr += cu->header.addr_size;
9316 info_ptr += cu->header.offset_size;
9318 case DW_FORM_GNU_ref_alt:
9319 info_ptr += cu->header.offset_size;
9322 info_ptr += cu->header.addr_size;
9329 case DW_FORM_flag_present:
9330 case DW_FORM_implicit_const:
9342 case DW_FORM_ref_sig8:
9345 case DW_FORM_data16:
9348 case DW_FORM_string:
9349 read_direct_string (abfd, info_ptr, &bytes_read);
9350 info_ptr += bytes_read;
9352 case DW_FORM_sec_offset:
9354 case DW_FORM_GNU_strp_alt:
9355 info_ptr += cu->header.offset_size;
9357 case DW_FORM_exprloc:
9359 info_ptr += read_unsigned_leb128 (abfd, info_ptr, &bytes_read);
9360 info_ptr += bytes_read;
9362 case DW_FORM_block1:
9363 info_ptr += 1 + read_1_byte (abfd, info_ptr);
9365 case DW_FORM_block2:
9366 info_ptr += 2 + read_2_bytes (abfd, info_ptr);
9368 case DW_FORM_block4:
9369 info_ptr += 4 + read_4_bytes (abfd, info_ptr);
9375 case DW_FORM_ref_udata:
9376 case DW_FORM_GNU_addr_index:
9377 case DW_FORM_GNU_str_index:
9378 info_ptr = safe_skip_leb128 (info_ptr, buffer_end);
9380 case DW_FORM_indirect:
9381 form = read_unsigned_leb128 (abfd, info_ptr, &bytes_read);
9382 info_ptr += bytes_read;
9383 /* We need to continue parsing from here, so just go back to
9385 goto skip_attribute;
9388 error (_("Dwarf Error: Cannot handle %s "
9389 "in DWARF reader [in module %s]"),
9390 dwarf_form_name (form),
9391 bfd_get_filename (abfd));
9395 if (abbrev->has_children)
9396 return skip_children (reader, info_ptr);
9401 /* Locate ORIG_PDI's sibling.
9402 INFO_PTR should point to the start of the next DIE after ORIG_PDI. */
9404 static const gdb_byte *
9405 locate_pdi_sibling (const struct die_reader_specs *reader,
9406 struct partial_die_info *orig_pdi,
9407 const gdb_byte *info_ptr)
9409 /* Do we know the sibling already? */
9411 if (orig_pdi->sibling)
9412 return orig_pdi->sibling;
9414 /* Are there any children to deal with? */
9416 if (!orig_pdi->has_children)
9419 /* Skip the children the long way. */
9421 return skip_children (reader, info_ptr);
9424 /* Expand this partial symbol table into a full symbol table. SELF is
9428 dwarf2_read_symtab (struct partial_symtab *self,
9429 struct objfile *objfile)
9431 struct dwarf2_per_objfile *dwarf2_per_objfile
9432 = get_dwarf2_per_objfile (objfile);
9436 warning (_("bug: psymtab for %s is already read in."),
9443 printf_filtered (_("Reading in symbols for %s..."),
9445 gdb_flush (gdb_stdout);
9448 /* If this psymtab is constructed from a debug-only objfile, the
9449 has_section_at_zero flag will not necessarily be correct. We
9450 can get the correct value for this flag by looking at the data
9451 associated with the (presumably stripped) associated objfile. */
9452 if (objfile->separate_debug_objfile_backlink)
9454 struct dwarf2_per_objfile *dpo_backlink
9455 = get_dwarf2_per_objfile (objfile->separate_debug_objfile_backlink);
9457 dwarf2_per_objfile->has_section_at_zero
9458 = dpo_backlink->has_section_at_zero;
9461 dwarf2_per_objfile->reading_partial_symbols = 0;
9463 psymtab_to_symtab_1 (self);
9465 /* Finish up the debug error message. */
9467 printf_filtered (_("done.\n"));
9470 process_cu_includes (dwarf2_per_objfile);
9473 /* Reading in full CUs. */
9475 /* Add PER_CU to the queue. */
9478 queue_comp_unit (struct dwarf2_per_cu_data *per_cu,
9479 enum language pretend_language)
9481 struct dwarf2_queue_item *item;
9484 item = XNEW (struct dwarf2_queue_item);
9485 item->per_cu = per_cu;
9486 item->pretend_language = pretend_language;
9489 if (dwarf2_queue == NULL)
9490 dwarf2_queue = item;
9492 dwarf2_queue_tail->next = item;
9494 dwarf2_queue_tail = item;
9497 /* If PER_CU is not yet queued, add it to the queue.
9498 If DEPENDENT_CU is non-NULL, it has a reference to PER_CU so add a
9500 The result is non-zero if PER_CU was queued, otherwise the result is zero
9501 meaning either PER_CU is already queued or it is already loaded.
9503 N.B. There is an invariant here that if a CU is queued then it is loaded.
9504 The caller is required to load PER_CU if we return non-zero. */
9507 maybe_queue_comp_unit (struct dwarf2_cu *dependent_cu,
9508 struct dwarf2_per_cu_data *per_cu,
9509 enum language pretend_language)
9511 /* We may arrive here during partial symbol reading, if we need full
9512 DIEs to process an unusual case (e.g. template arguments). Do
9513 not queue PER_CU, just tell our caller to load its DIEs. */
9514 if (per_cu->dwarf2_per_objfile->reading_partial_symbols)
9516 if (per_cu->cu == NULL || per_cu->cu->dies == NULL)
9521 /* Mark the dependence relation so that we don't flush PER_CU
9523 if (dependent_cu != NULL)
9524 dwarf2_add_dependence (dependent_cu, per_cu);
9526 /* If it's already on the queue, we have nothing to do. */
9530 /* If the compilation unit is already loaded, just mark it as
9532 if (per_cu->cu != NULL)
9534 per_cu->cu->last_used = 0;
9538 /* Add it to the queue. */
9539 queue_comp_unit (per_cu, pretend_language);
9544 /* Process the queue. */
9547 process_queue (struct dwarf2_per_objfile *dwarf2_per_objfile)
9549 struct dwarf2_queue_item *item, *next_item;
9551 if (dwarf_read_debug)
9553 fprintf_unfiltered (gdb_stdlog,
9554 "Expanding one or more symtabs of objfile %s ...\n",
9555 objfile_name (dwarf2_per_objfile->objfile));
9558 /* The queue starts out with one item, but following a DIE reference
9559 may load a new CU, adding it to the end of the queue. */
9560 for (item = dwarf2_queue; item != NULL; dwarf2_queue = item = next_item)
9562 if ((dwarf2_per_objfile->using_index
9563 ? !item->per_cu->v.quick->compunit_symtab
9564 : (item->per_cu->v.psymtab && !item->per_cu->v.psymtab->readin))
9565 /* Skip dummy CUs. */
9566 && item->per_cu->cu != NULL)
9568 struct dwarf2_per_cu_data *per_cu = item->per_cu;
9569 unsigned int debug_print_threshold;
9572 if (per_cu->is_debug_types)
9574 struct signatured_type *sig_type =
9575 (struct signatured_type *) per_cu;
9577 sprintf (buf, "TU %s at offset %s",
9578 hex_string (sig_type->signature),
9579 sect_offset_str (per_cu->sect_off));
9580 /* There can be 100s of TUs.
9581 Only print them in verbose mode. */
9582 debug_print_threshold = 2;
9586 sprintf (buf, "CU at offset %s",
9587 sect_offset_str (per_cu->sect_off));
9588 debug_print_threshold = 1;
9591 if (dwarf_read_debug >= debug_print_threshold)
9592 fprintf_unfiltered (gdb_stdlog, "Expanding symtab of %s\n", buf);
9594 if (per_cu->is_debug_types)
9595 process_full_type_unit (per_cu, item->pretend_language);
9597 process_full_comp_unit (per_cu, item->pretend_language);
9599 if (dwarf_read_debug >= debug_print_threshold)
9600 fprintf_unfiltered (gdb_stdlog, "Done expanding %s\n", buf);
9603 item->per_cu->queued = 0;
9604 next_item = item->next;
9608 dwarf2_queue_tail = NULL;
9610 if (dwarf_read_debug)
9612 fprintf_unfiltered (gdb_stdlog, "Done expanding symtabs of %s.\n",
9613 objfile_name (dwarf2_per_objfile->objfile));
9617 /* Read in full symbols for PST, and anything it depends on. */
9620 psymtab_to_symtab_1 (struct partial_symtab *pst)
9622 struct dwarf2_per_cu_data *per_cu;
9628 for (i = 0; i < pst->number_of_dependencies; i++)
9629 if (!pst->dependencies[i]->readin
9630 && pst->dependencies[i]->user == NULL)
9632 /* Inform about additional files that need to be read in. */
9635 /* FIXME: i18n: Need to make this a single string. */
9636 fputs_filtered (" ", gdb_stdout);
9638 fputs_filtered ("and ", gdb_stdout);
9640 printf_filtered ("%s...", pst->dependencies[i]->filename);
9641 wrap_here (""); /* Flush output. */
9642 gdb_flush (gdb_stdout);
9644 psymtab_to_symtab_1 (pst->dependencies[i]);
9647 per_cu = (struct dwarf2_per_cu_data *) pst->read_symtab_private;
9651 /* It's an include file, no symbols to read for it.
9652 Everything is in the parent symtab. */
9657 dw2_do_instantiate_symtab (per_cu, false);
9660 /* Trivial hash function for die_info: the hash value of a DIE
9661 is its offset in .debug_info for this objfile. */
9664 die_hash (const void *item)
9666 const struct die_info *die = (const struct die_info *) item;
9668 return to_underlying (die->sect_off);
9671 /* Trivial comparison function for die_info structures: two DIEs
9672 are equal if they have the same offset. */
9675 die_eq (const void *item_lhs, const void *item_rhs)
9677 const struct die_info *die_lhs = (const struct die_info *) item_lhs;
9678 const struct die_info *die_rhs = (const struct die_info *) item_rhs;
9680 return die_lhs->sect_off == die_rhs->sect_off;
9683 /* die_reader_func for load_full_comp_unit.
9684 This is identical to read_signatured_type_reader,
9685 but is kept separate for now. */
9688 load_full_comp_unit_reader (const struct die_reader_specs *reader,
9689 const gdb_byte *info_ptr,
9690 struct die_info *comp_unit_die,
9694 struct dwarf2_cu *cu = reader->cu;
9695 enum language *language_ptr = (enum language *) data;
9697 gdb_assert (cu->die_hash == NULL);
9699 htab_create_alloc_ex (cu->header.length / 12,
9703 &cu->comp_unit_obstack,
9704 hashtab_obstack_allocate,
9705 dummy_obstack_deallocate);
9708 comp_unit_die->child = read_die_and_siblings (reader, info_ptr,
9709 &info_ptr, comp_unit_die);
9710 cu->dies = comp_unit_die;
9711 /* comp_unit_die is not stored in die_hash, no need. */
9713 /* We try not to read any attributes in this function, because not
9714 all CUs needed for references have been loaded yet, and symbol
9715 table processing isn't initialized. But we have to set the CU language,
9716 or we won't be able to build types correctly.
9717 Similarly, if we do not read the producer, we can not apply
9718 producer-specific interpretation. */
9719 prepare_one_comp_unit (cu, cu->dies, *language_ptr);
9722 /* Load the DIEs associated with PER_CU into memory. */
9725 load_full_comp_unit (struct dwarf2_per_cu_data *this_cu,
9727 enum language pretend_language)
9729 gdb_assert (! this_cu->is_debug_types);
9731 init_cutu_and_read_dies (this_cu, NULL, 1, 1, skip_partial,
9732 load_full_comp_unit_reader, &pretend_language);
9735 /* Add a DIE to the delayed physname list. */
9738 add_to_method_list (struct type *type, int fnfield_index, int index,
9739 const char *name, struct die_info *die,
9740 struct dwarf2_cu *cu)
9742 struct delayed_method_info mi;
9744 mi.fnfield_index = fnfield_index;
9748 cu->method_list.push_back (mi);
9751 /* Check whether [PHYSNAME, PHYSNAME+LEN) ends with a modifier like
9752 "const" / "volatile". If so, decrements LEN by the length of the
9753 modifier and return true. Otherwise return false. */
9757 check_modifier (const char *physname, size_t &len, const char (&mod)[N])
9759 size_t mod_len = sizeof (mod) - 1;
9760 if (len > mod_len && startswith (physname + (len - mod_len), mod))
9768 /* Compute the physnames of any methods on the CU's method list.
9770 The computation of method physnames is delayed in order to avoid the
9771 (bad) condition that one of the method's formal parameters is of an as yet
9775 compute_delayed_physnames (struct dwarf2_cu *cu)
9777 /* Only C++ delays computing physnames. */
9778 if (cu->method_list.empty ())
9780 gdb_assert (cu->language == language_cplus);
9782 for (const delayed_method_info &mi : cu->method_list)
9784 const char *physname;
9785 struct fn_fieldlist *fn_flp
9786 = &TYPE_FN_FIELDLIST (mi.type, mi.fnfield_index);
9787 physname = dwarf2_physname (mi.name, mi.die, cu);
9788 TYPE_FN_FIELD_PHYSNAME (fn_flp->fn_fields, mi.index)
9789 = physname ? physname : "";
9791 /* Since there's no tag to indicate whether a method is a
9792 const/volatile overload, extract that information out of the
9794 if (physname != NULL)
9796 size_t len = strlen (physname);
9800 if (physname[len] == ')') /* shortcut */
9802 else if (check_modifier (physname, len, " const"))
9803 TYPE_FN_FIELD_CONST (fn_flp->fn_fields, mi.index) = 1;
9804 else if (check_modifier (physname, len, " volatile"))
9805 TYPE_FN_FIELD_VOLATILE (fn_flp->fn_fields, mi.index) = 1;
9812 /* The list is no longer needed. */
9813 cu->method_list.clear ();
9816 /* Go objects should be embedded in a DW_TAG_module DIE,
9817 and it's not clear if/how imported objects will appear.
9818 To keep Go support simple until that's worked out,
9819 go back through what we've read and create something usable.
9820 We could do this while processing each DIE, and feels kinda cleaner,
9821 but that way is more invasive.
9822 This is to, for example, allow the user to type "p var" or "b main"
9823 without having to specify the package name, and allow lookups
9824 of module.object to work in contexts that use the expression
9828 fixup_go_packaging (struct dwarf2_cu *cu)
9830 char *package_name = NULL;
9831 struct pending *list;
9834 for (list = *cu->get_builder ()->get_global_symbols ();
9838 for (i = 0; i < list->nsyms; ++i)
9840 struct symbol *sym = list->symbol[i];
9842 if (SYMBOL_LANGUAGE (sym) == language_go
9843 && SYMBOL_CLASS (sym) == LOC_BLOCK)
9845 char *this_package_name = go_symbol_package_name (sym);
9847 if (this_package_name == NULL)
9849 if (package_name == NULL)
9850 package_name = this_package_name;
9853 struct objfile *objfile
9854 = cu->per_cu->dwarf2_per_objfile->objfile;
9855 if (strcmp (package_name, this_package_name) != 0)
9856 complaint (_("Symtab %s has objects from two different Go packages: %s and %s"),
9857 (symbol_symtab (sym) != NULL
9858 ? symtab_to_filename_for_display
9859 (symbol_symtab (sym))
9860 : objfile_name (objfile)),
9861 this_package_name, package_name);
9862 xfree (this_package_name);
9868 if (package_name != NULL)
9870 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
9871 const char *saved_package_name
9872 = (const char *) obstack_copy0 (&objfile->per_bfd->storage_obstack,
9874 strlen (package_name));
9875 struct type *type = init_type (objfile, TYPE_CODE_MODULE, 0,
9876 saved_package_name);
9879 sym = allocate_symbol (objfile);
9880 SYMBOL_SET_LANGUAGE (sym, language_go, &objfile->objfile_obstack);
9881 SYMBOL_SET_NAMES (sym, saved_package_name,
9882 strlen (saved_package_name), 0, objfile);
9883 /* This is not VAR_DOMAIN because we want a way to ensure a lookup of,
9884 e.g., "main" finds the "main" module and not C's main(). */
9885 SYMBOL_DOMAIN (sym) = STRUCT_DOMAIN;
9886 SYMBOL_ACLASS_INDEX (sym) = LOC_TYPEDEF;
9887 SYMBOL_TYPE (sym) = type;
9889 add_symbol_to_list (sym, cu->get_builder ()->get_global_symbols ());
9891 xfree (package_name);
9895 /* Allocate a fully-qualified name consisting of the two parts on the
9899 rust_fully_qualify (struct obstack *obstack, const char *p1, const char *p2)
9901 return obconcat (obstack, p1, "::", p2, (char *) NULL);
9904 /* A helper that allocates a struct discriminant_info to attach to a
9907 static struct discriminant_info *
9908 alloc_discriminant_info (struct type *type, int discriminant_index,
9911 gdb_assert (TYPE_CODE (type) == TYPE_CODE_UNION);
9912 gdb_assert (discriminant_index == -1
9913 || (discriminant_index >= 0
9914 && discriminant_index < TYPE_NFIELDS (type)));
9915 gdb_assert (default_index == -1
9916 || (default_index >= 0 && default_index < TYPE_NFIELDS (type)));
9918 TYPE_FLAG_DISCRIMINATED_UNION (type) = 1;
9920 struct discriminant_info *disc
9921 = ((struct discriminant_info *)
9923 offsetof (struct discriminant_info, discriminants)
9924 + TYPE_NFIELDS (type) * sizeof (disc->discriminants[0])));
9925 disc->default_index = default_index;
9926 disc->discriminant_index = discriminant_index;
9928 struct dynamic_prop prop;
9929 prop.kind = PROP_UNDEFINED;
9930 prop.data.baton = disc;
9932 add_dyn_prop (DYN_PROP_DISCRIMINATED, prop, type);
9937 /* Some versions of rustc emitted enums in an unusual way.
9939 Ordinary enums were emitted as unions. The first element of each
9940 structure in the union was named "RUST$ENUM$DISR". This element
9941 held the discriminant.
9943 These versions of Rust also implemented the "non-zero"
9944 optimization. When the enum had two values, and one is empty and
9945 the other holds a pointer that cannot be zero, the pointer is used
9946 as the discriminant, with a zero value meaning the empty variant.
9947 Here, the union's first member is of the form
9948 RUST$ENCODED$ENUM$<fieldno>$<fieldno>$...$<variantname>
9949 where the fieldnos are the indices of the fields that should be
9950 traversed in order to find the field (which may be several fields deep)
9951 and the variantname is the name of the variant of the case when the
9954 This function recognizes whether TYPE is of one of these forms,
9955 and, if so, smashes it to be a variant type. */
9958 quirk_rust_enum (struct type *type, struct objfile *objfile)
9960 gdb_assert (TYPE_CODE (type) == TYPE_CODE_UNION);
9962 /* We don't need to deal with empty enums. */
9963 if (TYPE_NFIELDS (type) == 0)
9966 #define RUST_ENUM_PREFIX "RUST$ENCODED$ENUM$"
9967 if (TYPE_NFIELDS (type) == 1
9968 && startswith (TYPE_FIELD_NAME (type, 0), RUST_ENUM_PREFIX))
9970 const char *name = TYPE_FIELD_NAME (type, 0) + strlen (RUST_ENUM_PREFIX);
9972 /* Decode the field name to find the offset of the
9974 ULONGEST bit_offset = 0;
9975 struct type *field_type = TYPE_FIELD_TYPE (type, 0);
9976 while (name[0] >= '0' && name[0] <= '9')
9979 unsigned long index = strtoul (name, &tail, 10);
9982 || index >= TYPE_NFIELDS (field_type)
9983 || (TYPE_FIELD_LOC_KIND (field_type, index)
9984 != FIELD_LOC_KIND_BITPOS))
9986 complaint (_("Could not parse Rust enum encoding string \"%s\""
9988 TYPE_FIELD_NAME (type, 0),
9989 objfile_name (objfile));
9994 bit_offset += TYPE_FIELD_BITPOS (field_type, index);
9995 field_type = TYPE_FIELD_TYPE (field_type, index);
9998 /* Make a union to hold the variants. */
9999 struct type *union_type = alloc_type (objfile);
10000 TYPE_CODE (union_type) = TYPE_CODE_UNION;
10001 TYPE_NFIELDS (union_type) = 3;
10002 TYPE_FIELDS (union_type)
10003 = (struct field *) TYPE_ZALLOC (type, 3 * sizeof (struct field));
10004 TYPE_LENGTH (union_type) = TYPE_LENGTH (type);
10005 set_type_align (union_type, TYPE_RAW_ALIGN (type));
10007 /* Put the discriminant must at index 0. */
10008 TYPE_FIELD_TYPE (union_type, 0) = field_type;
10009 TYPE_FIELD_ARTIFICIAL (union_type, 0) = 1;
10010 TYPE_FIELD_NAME (union_type, 0) = "<<discriminant>>";
10011 SET_FIELD_BITPOS (TYPE_FIELD (union_type, 0), bit_offset);
10013 /* The order of fields doesn't really matter, so put the real
10014 field at index 1 and the data-less field at index 2. */
10015 struct discriminant_info *disc
10016 = alloc_discriminant_info (union_type, 0, 1);
10017 TYPE_FIELD (union_type, 1) = TYPE_FIELD (type, 0);
10018 TYPE_FIELD_NAME (union_type, 1)
10019 = rust_last_path_segment (TYPE_NAME (TYPE_FIELD_TYPE (union_type, 1)));
10020 TYPE_NAME (TYPE_FIELD_TYPE (union_type, 1))
10021 = rust_fully_qualify (&objfile->objfile_obstack, TYPE_NAME (type),
10022 TYPE_FIELD_NAME (union_type, 1));
10024 const char *dataless_name
10025 = rust_fully_qualify (&objfile->objfile_obstack, TYPE_NAME (type),
10027 struct type *dataless_type = init_type (objfile, TYPE_CODE_VOID, 0,
10029 TYPE_FIELD_TYPE (union_type, 2) = dataless_type;
10030 /* NAME points into the original discriminant name, which
10031 already has the correct lifetime. */
10032 TYPE_FIELD_NAME (union_type, 2) = name;
10033 SET_FIELD_BITPOS (TYPE_FIELD (union_type, 2), 0);
10034 disc->discriminants[2] = 0;
10036 /* Smash this type to be a structure type. We have to do this
10037 because the type has already been recorded. */
10038 TYPE_CODE (type) = TYPE_CODE_STRUCT;
10039 TYPE_NFIELDS (type) = 1;
10041 = (struct field *) TYPE_ZALLOC (type, sizeof (struct field));
10043 /* Install the variant part. */
10044 TYPE_FIELD_TYPE (type, 0) = union_type;
10045 SET_FIELD_BITPOS (TYPE_FIELD (type, 0), 0);
10046 TYPE_FIELD_NAME (type, 0) = "<<variants>>";
10048 else if (TYPE_NFIELDS (type) == 1)
10050 /* We assume that a union with a single field is a univariant
10052 /* Smash this type to be a structure type. We have to do this
10053 because the type has already been recorded. */
10054 TYPE_CODE (type) = TYPE_CODE_STRUCT;
10056 /* Make a union to hold the variants. */
10057 struct type *union_type = alloc_type (objfile);
10058 TYPE_CODE (union_type) = TYPE_CODE_UNION;
10059 TYPE_NFIELDS (union_type) = TYPE_NFIELDS (type);
10060 TYPE_LENGTH (union_type) = TYPE_LENGTH (type);
10061 set_type_align (union_type, TYPE_RAW_ALIGN (type));
10062 TYPE_FIELDS (union_type) = TYPE_FIELDS (type);
10064 struct type *field_type = TYPE_FIELD_TYPE (union_type, 0);
10065 const char *variant_name
10066 = rust_last_path_segment (TYPE_NAME (field_type));
10067 TYPE_FIELD_NAME (union_type, 0) = variant_name;
10068 TYPE_NAME (field_type)
10069 = rust_fully_qualify (&objfile->objfile_obstack,
10070 TYPE_NAME (type), variant_name);
10072 /* Install the union in the outer struct type. */
10073 TYPE_NFIELDS (type) = 1;
10075 = (struct field *) TYPE_ZALLOC (union_type, sizeof (struct field));
10076 TYPE_FIELD_TYPE (type, 0) = union_type;
10077 TYPE_FIELD_NAME (type, 0) = "<<variants>>";
10078 SET_FIELD_BITPOS (TYPE_FIELD (type, 0), 0);
10080 alloc_discriminant_info (union_type, -1, 0);
10084 struct type *disr_type = nullptr;
10085 for (int i = 0; i < TYPE_NFIELDS (type); ++i)
10087 disr_type = TYPE_FIELD_TYPE (type, i);
10089 if (TYPE_CODE (disr_type) != TYPE_CODE_STRUCT)
10091 /* All fields of a true enum will be structs. */
10094 else if (TYPE_NFIELDS (disr_type) == 0)
10096 /* Could be data-less variant, so keep going. */
10097 disr_type = nullptr;
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 set_type_align (union_type, TYPE_RAW_ALIGN (type));
10128 TYPE_FIELDS (union_type)
10129 = (struct field *) TYPE_ZALLOC (union_type,
10130 (TYPE_NFIELDS (union_type)
10131 * sizeof (struct field)));
10133 memcpy (TYPE_FIELDS (union_type) + 1, TYPE_FIELDS (type),
10134 TYPE_NFIELDS (type) * sizeof (struct field));
10136 /* Install the discriminant at index 0 in the union. */
10137 TYPE_FIELD (union_type, 0) = *disr_field;
10138 TYPE_FIELD_ARTIFICIAL (union_type, 0) = 1;
10139 TYPE_FIELD_NAME (union_type, 0) = "<<discriminant>>";
10141 /* Install the union in the outer struct type. */
10142 TYPE_FIELD_TYPE (type, 0) = union_type;
10143 TYPE_FIELD_NAME (type, 0) = "<<variants>>";
10144 TYPE_NFIELDS (type) = 1;
10146 /* Set the size and offset of the union type. */
10147 SET_FIELD_BITPOS (TYPE_FIELD (type, 0), 0);
10149 /* We need a way to find the correct discriminant given a
10150 variant name. For convenience we build a map here. */
10151 struct type *enum_type = FIELD_TYPE (*disr_field);
10152 std::unordered_map<std::string, ULONGEST> discriminant_map;
10153 for (int i = 0; i < TYPE_NFIELDS (enum_type); ++i)
10155 if (TYPE_FIELD_LOC_KIND (enum_type, i) == FIELD_LOC_KIND_ENUMVAL)
10158 = rust_last_path_segment (TYPE_FIELD_NAME (enum_type, i));
10159 discriminant_map[name] = TYPE_FIELD_ENUMVAL (enum_type, i);
10163 int n_fields = TYPE_NFIELDS (union_type);
10164 struct discriminant_info *disc
10165 = alloc_discriminant_info (union_type, 0, -1);
10166 /* Skip the discriminant here. */
10167 for (int i = 1; i < n_fields; ++i)
10169 /* Find the final word in the name of this variant's type.
10170 That name can be used to look up the correct
10172 const char *variant_name
10173 = rust_last_path_segment (TYPE_NAME (TYPE_FIELD_TYPE (union_type,
10176 auto iter = discriminant_map.find (variant_name);
10177 if (iter != discriminant_map.end ())
10178 disc->discriminants[i] = iter->second;
10180 /* Remove the discriminant field, if it exists. */
10181 struct type *sub_type = TYPE_FIELD_TYPE (union_type, i);
10182 if (TYPE_NFIELDS (sub_type) > 0)
10184 --TYPE_NFIELDS (sub_type);
10185 ++TYPE_FIELDS (sub_type);
10187 TYPE_FIELD_NAME (union_type, i) = variant_name;
10188 TYPE_NAME (sub_type)
10189 = rust_fully_qualify (&objfile->objfile_obstack,
10190 TYPE_NAME (type), variant_name);
10195 /* Rewrite some Rust unions to be structures with variants parts. */
10198 rust_union_quirks (struct dwarf2_cu *cu)
10200 gdb_assert (cu->language == language_rust);
10201 for (type *type_ : cu->rust_unions)
10202 quirk_rust_enum (type_, cu->per_cu->dwarf2_per_objfile->objfile);
10203 /* We don't need this any more. */
10204 cu->rust_unions.clear ();
10207 /* Return the symtab for PER_CU. This works properly regardless of
10208 whether we're using the index or psymtabs. */
10210 static struct compunit_symtab *
10211 get_compunit_symtab (struct dwarf2_per_cu_data *per_cu)
10213 return (per_cu->dwarf2_per_objfile->using_index
10214 ? per_cu->v.quick->compunit_symtab
10215 : per_cu->v.psymtab->compunit_symtab);
10218 /* A helper function for computing the list of all symbol tables
10219 included by PER_CU. */
10222 recursively_compute_inclusions (std::vector<compunit_symtab *> *result,
10223 htab_t all_children, htab_t all_type_symtabs,
10224 struct dwarf2_per_cu_data *per_cu,
10225 struct compunit_symtab *immediate_parent)
10229 struct compunit_symtab *cust;
10230 struct dwarf2_per_cu_data *iter;
10232 slot = htab_find_slot (all_children, per_cu, INSERT);
10235 /* This inclusion and its children have been processed. */
10240 /* Only add a CU if it has a symbol table. */
10241 cust = get_compunit_symtab (per_cu);
10244 /* If this is a type unit only add its symbol table if we haven't
10245 seen it yet (type unit per_cu's can share symtabs). */
10246 if (per_cu->is_debug_types)
10248 slot = htab_find_slot (all_type_symtabs, cust, INSERT);
10252 result->push_back (cust);
10253 if (cust->user == NULL)
10254 cust->user = immediate_parent;
10259 result->push_back (cust);
10260 if (cust->user == NULL)
10261 cust->user = immediate_parent;
10266 VEC_iterate (dwarf2_per_cu_ptr, per_cu->imported_symtabs, ix, iter);
10269 recursively_compute_inclusions (result, all_children,
10270 all_type_symtabs, iter, cust);
10274 /* Compute the compunit_symtab 'includes' fields for the compunit_symtab of
10278 compute_compunit_symtab_includes (struct dwarf2_per_cu_data *per_cu)
10280 gdb_assert (! per_cu->is_debug_types);
10282 if (!VEC_empty (dwarf2_per_cu_ptr, per_cu->imported_symtabs))
10285 struct dwarf2_per_cu_data *per_cu_iter;
10286 std::vector<compunit_symtab *> result_symtabs;
10287 htab_t all_children, all_type_symtabs;
10288 struct compunit_symtab *cust = get_compunit_symtab (per_cu);
10290 /* If we don't have a symtab, we can just skip this case. */
10294 all_children = htab_create_alloc (1, htab_hash_pointer, htab_eq_pointer,
10295 NULL, xcalloc, xfree);
10296 all_type_symtabs = htab_create_alloc (1, htab_hash_pointer, htab_eq_pointer,
10297 NULL, xcalloc, xfree);
10300 VEC_iterate (dwarf2_per_cu_ptr, per_cu->imported_symtabs,
10304 recursively_compute_inclusions (&result_symtabs, all_children,
10305 all_type_symtabs, per_cu_iter,
10309 /* Now we have a transitive closure of all the included symtabs. */
10310 len = result_symtabs.size ();
10312 = XOBNEWVEC (&per_cu->dwarf2_per_objfile->objfile->objfile_obstack,
10313 struct compunit_symtab *, len + 1);
10314 memcpy (cust->includes, result_symtabs.data (),
10315 len * sizeof (compunit_symtab *));
10316 cust->includes[len] = NULL;
10318 htab_delete (all_children);
10319 htab_delete (all_type_symtabs);
10323 /* Compute the 'includes' field for the symtabs of all the CUs we just
10327 process_cu_includes (struct dwarf2_per_objfile *dwarf2_per_objfile)
10329 for (dwarf2_per_cu_data *iter : dwarf2_per_objfile->just_read_cus)
10331 if (! iter->is_debug_types)
10332 compute_compunit_symtab_includes (iter);
10335 dwarf2_per_objfile->just_read_cus.clear ();
10338 /* Generate full symbol information for PER_CU, whose DIEs have
10339 already been loaded into memory. */
10342 process_full_comp_unit (struct dwarf2_per_cu_data *per_cu,
10343 enum language pretend_language)
10345 struct dwarf2_cu *cu = per_cu->cu;
10346 struct dwarf2_per_objfile *dwarf2_per_objfile = per_cu->dwarf2_per_objfile;
10347 struct objfile *objfile = dwarf2_per_objfile->objfile;
10348 struct gdbarch *gdbarch = get_objfile_arch (objfile);
10349 CORE_ADDR lowpc, highpc;
10350 struct compunit_symtab *cust;
10351 CORE_ADDR baseaddr;
10352 struct block *static_block;
10355 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
10357 /* Clear the list here in case something was left over. */
10358 cu->method_list.clear ();
10360 cu->language = pretend_language;
10361 cu->language_defn = language_def (cu->language);
10363 /* Do line number decoding in read_file_scope () */
10364 process_die (cu->dies, cu);
10366 /* For now fudge the Go package. */
10367 if (cu->language == language_go)
10368 fixup_go_packaging (cu);
10370 /* Now that we have processed all the DIEs in the CU, all the types
10371 should be complete, and it should now be safe to compute all of the
10373 compute_delayed_physnames (cu);
10375 if (cu->language == language_rust)
10376 rust_union_quirks (cu);
10378 /* Some compilers don't define a DW_AT_high_pc attribute for the
10379 compilation unit. If the DW_AT_high_pc is missing, synthesize
10380 it, by scanning the DIE's below the compilation unit. */
10381 get_scope_pc_bounds (cu->dies, &lowpc, &highpc, cu);
10383 addr = gdbarch_adjust_dwarf2_addr (gdbarch, highpc + baseaddr);
10384 static_block = cu->get_builder ()->end_symtab_get_static_block (addr, 0, 1);
10386 /* If the comp unit has DW_AT_ranges, it may have discontiguous ranges.
10387 Also, DW_AT_ranges may record ranges not belonging to any child DIEs
10388 (such as virtual method tables). Record the ranges in STATIC_BLOCK's
10389 addrmap to help ensure it has an accurate map of pc values belonging to
10391 dwarf2_record_block_ranges (cu->dies, static_block, baseaddr, cu);
10393 cust = cu->get_builder ()->end_symtab_from_static_block (static_block,
10394 SECT_OFF_TEXT (objfile),
10399 int gcc_4_minor = producer_is_gcc_ge_4 (cu->producer);
10401 /* Set symtab language to language from DW_AT_language. If the
10402 compilation is from a C file generated by language preprocessors, do
10403 not set the language if it was already deduced by start_subfile. */
10404 if (!(cu->language == language_c
10405 && COMPUNIT_FILETABS (cust)->language != language_unknown))
10406 COMPUNIT_FILETABS (cust)->language = cu->language;
10408 /* GCC-4.0 has started to support -fvar-tracking. GCC-3.x still can
10409 produce DW_AT_location with location lists but it can be possibly
10410 invalid without -fvar-tracking. Still up to GCC-4.4.x incl. 4.4.0
10411 there were bugs in prologue debug info, fixed later in GCC-4.5
10412 by "unwind info for epilogues" patch (which is not directly related).
10414 For -gdwarf-4 type units LOCATIONS_VALID indication is fortunately not
10415 needed, it would be wrong due to missing DW_AT_producer there.
10417 Still one can confuse GDB by using non-standard GCC compilation
10418 options - this waits on GCC PR other/32998 (-frecord-gcc-switches).
10420 if (cu->has_loclist && gcc_4_minor >= 5)
10421 cust->locations_valid = 1;
10423 if (gcc_4_minor >= 5)
10424 cust->epilogue_unwind_valid = 1;
10426 cust->call_site_htab = cu->call_site_htab;
10429 if (dwarf2_per_objfile->using_index)
10430 per_cu->v.quick->compunit_symtab = cust;
10433 struct partial_symtab *pst = per_cu->v.psymtab;
10434 pst->compunit_symtab = cust;
10438 /* Push it for inclusion processing later. */
10439 dwarf2_per_objfile->just_read_cus.push_back (per_cu);
10441 /* Not needed any more. */
10442 cu->reset_builder ();
10445 /* Generate full symbol information for type unit PER_CU, whose DIEs have
10446 already been loaded into memory. */
10449 process_full_type_unit (struct dwarf2_per_cu_data *per_cu,
10450 enum language pretend_language)
10452 struct dwarf2_cu *cu = per_cu->cu;
10453 struct dwarf2_per_objfile *dwarf2_per_objfile = per_cu->dwarf2_per_objfile;
10454 struct objfile *objfile = dwarf2_per_objfile->objfile;
10455 struct compunit_symtab *cust;
10456 struct signatured_type *sig_type;
10458 gdb_assert (per_cu->is_debug_types);
10459 sig_type = (struct signatured_type *) per_cu;
10461 /* Clear the list here in case something was left over. */
10462 cu->method_list.clear ();
10464 cu->language = pretend_language;
10465 cu->language_defn = language_def (cu->language);
10467 /* The symbol tables are set up in read_type_unit_scope. */
10468 process_die (cu->dies, cu);
10470 /* For now fudge the Go package. */
10471 if (cu->language == language_go)
10472 fixup_go_packaging (cu);
10474 /* Now that we have processed all the DIEs in the CU, all the types
10475 should be complete, and it should now be safe to compute all of the
10477 compute_delayed_physnames (cu);
10479 if (cu->language == language_rust)
10480 rust_union_quirks (cu);
10482 /* TUs share symbol tables.
10483 If this is the first TU to use this symtab, complete the construction
10484 of it with end_expandable_symtab. Otherwise, complete the addition of
10485 this TU's symbols to the existing symtab. */
10486 if (sig_type->type_unit_group->compunit_symtab == NULL)
10488 buildsym_compunit *builder = cu->get_builder ();
10489 cust = builder->end_expandable_symtab (0, SECT_OFF_TEXT (objfile));
10490 sig_type->type_unit_group->compunit_symtab = cust;
10494 /* Set symtab language to language from DW_AT_language. If the
10495 compilation is from a C file generated by language preprocessors,
10496 do not set the language if it was already deduced by
10498 if (!(cu->language == language_c
10499 && COMPUNIT_FILETABS (cust)->language != language_c))
10500 COMPUNIT_FILETABS (cust)->language = cu->language;
10505 cu->get_builder ()->augment_type_symtab ();
10506 cust = sig_type->type_unit_group->compunit_symtab;
10509 if (dwarf2_per_objfile->using_index)
10510 per_cu->v.quick->compunit_symtab = cust;
10513 struct partial_symtab *pst = per_cu->v.psymtab;
10514 pst->compunit_symtab = cust;
10518 /* Not needed any more. */
10519 cu->reset_builder ();
10522 /* Process an imported unit DIE. */
10525 process_imported_unit_die (struct die_info *die, struct dwarf2_cu *cu)
10527 struct attribute *attr;
10529 /* For now we don't handle imported units in type units. */
10530 if (cu->per_cu->is_debug_types)
10532 error (_("Dwarf Error: DW_TAG_imported_unit is not"
10533 " supported in type units [in module %s]"),
10534 objfile_name (cu->per_cu->dwarf2_per_objfile->objfile));
10537 attr = dwarf2_attr (die, DW_AT_import, cu);
10540 sect_offset sect_off = dwarf2_get_ref_die_offset (attr);
10541 bool is_dwz = (attr->form == DW_FORM_GNU_ref_alt || cu->per_cu->is_dwz);
10542 dwarf2_per_cu_data *per_cu
10543 = dwarf2_find_containing_comp_unit (sect_off, is_dwz,
10544 cu->per_cu->dwarf2_per_objfile);
10546 /* If necessary, add it to the queue and load its DIEs. */
10547 if (maybe_queue_comp_unit (cu, per_cu, cu->language))
10548 load_full_comp_unit (per_cu, false, cu->language);
10550 VEC_safe_push (dwarf2_per_cu_ptr, cu->per_cu->imported_symtabs,
10555 /* RAII object that represents a process_die scope: i.e.,
10556 starts/finishes processing a DIE. */
10557 class process_die_scope
10560 process_die_scope (die_info *die, dwarf2_cu *cu)
10561 : m_die (die), m_cu (cu)
10563 /* We should only be processing DIEs not already in process. */
10564 gdb_assert (!m_die->in_process);
10565 m_die->in_process = true;
10568 ~process_die_scope ()
10570 m_die->in_process = false;
10572 /* If we're done processing the DIE for the CU that owns the line
10573 header, we don't need the line header anymore. */
10574 if (m_cu->line_header_die_owner == m_die)
10576 delete m_cu->line_header;
10577 m_cu->line_header = NULL;
10578 m_cu->line_header_die_owner = NULL;
10587 /* Process a die and its children. */
10590 process_die (struct die_info *die, struct dwarf2_cu *cu)
10592 process_die_scope scope (die, cu);
10596 case DW_TAG_padding:
10598 case DW_TAG_compile_unit:
10599 case DW_TAG_partial_unit:
10600 read_file_scope (die, cu);
10602 case DW_TAG_type_unit:
10603 read_type_unit_scope (die, cu);
10605 case DW_TAG_subprogram:
10606 case DW_TAG_inlined_subroutine:
10607 read_func_scope (die, cu);
10609 case DW_TAG_lexical_block:
10610 case DW_TAG_try_block:
10611 case DW_TAG_catch_block:
10612 read_lexical_block_scope (die, cu);
10614 case DW_TAG_call_site:
10615 case DW_TAG_GNU_call_site:
10616 read_call_site_scope (die, cu);
10618 case DW_TAG_class_type:
10619 case DW_TAG_interface_type:
10620 case DW_TAG_structure_type:
10621 case DW_TAG_union_type:
10622 process_structure_scope (die, cu);
10624 case DW_TAG_enumeration_type:
10625 process_enumeration_scope (die, cu);
10628 /* These dies have a type, but processing them does not create
10629 a symbol or recurse to process the children. Therefore we can
10630 read them on-demand through read_type_die. */
10631 case DW_TAG_subroutine_type:
10632 case DW_TAG_set_type:
10633 case DW_TAG_array_type:
10634 case DW_TAG_pointer_type:
10635 case DW_TAG_ptr_to_member_type:
10636 case DW_TAG_reference_type:
10637 case DW_TAG_rvalue_reference_type:
10638 case DW_TAG_string_type:
10641 case DW_TAG_base_type:
10642 case DW_TAG_subrange_type:
10643 case DW_TAG_typedef:
10644 /* Add a typedef symbol for the type definition, if it has a
10646 new_symbol (die, read_type_die (die, cu), cu);
10648 case DW_TAG_common_block:
10649 read_common_block (die, cu);
10651 case DW_TAG_common_inclusion:
10653 case DW_TAG_namespace:
10654 cu->processing_has_namespace_info = true;
10655 read_namespace (die, cu);
10657 case DW_TAG_module:
10658 cu->processing_has_namespace_info = true;
10659 read_module (die, cu);
10661 case DW_TAG_imported_declaration:
10662 cu->processing_has_namespace_info = true;
10663 if (read_namespace_alias (die, cu))
10665 /* The declaration is not a global namespace alias. */
10666 /* Fall through. */
10667 case DW_TAG_imported_module:
10668 cu->processing_has_namespace_info = true;
10669 if (die->child != NULL && (die->tag == DW_TAG_imported_declaration
10670 || cu->language != language_fortran))
10671 complaint (_("Tag '%s' has unexpected children"),
10672 dwarf_tag_name (die->tag));
10673 read_import_statement (die, cu);
10676 case DW_TAG_imported_unit:
10677 process_imported_unit_die (die, cu);
10680 case DW_TAG_variable:
10681 read_variable (die, cu);
10685 new_symbol (die, NULL, cu);
10690 /* DWARF name computation. */
10692 /* A helper function for dwarf2_compute_name which determines whether DIE
10693 needs to have the name of the scope prepended to the name listed in the
10697 die_needs_namespace (struct die_info *die, struct dwarf2_cu *cu)
10699 struct attribute *attr;
10703 case DW_TAG_namespace:
10704 case DW_TAG_typedef:
10705 case DW_TAG_class_type:
10706 case DW_TAG_interface_type:
10707 case DW_TAG_structure_type:
10708 case DW_TAG_union_type:
10709 case DW_TAG_enumeration_type:
10710 case DW_TAG_enumerator:
10711 case DW_TAG_subprogram:
10712 case DW_TAG_inlined_subroutine:
10713 case DW_TAG_member:
10714 case DW_TAG_imported_declaration:
10717 case DW_TAG_variable:
10718 case DW_TAG_constant:
10719 /* We only need to prefix "globally" visible variables. These include
10720 any variable marked with DW_AT_external or any variable that
10721 lives in a namespace. [Variables in anonymous namespaces
10722 require prefixing, but they are not DW_AT_external.] */
10724 if (dwarf2_attr (die, DW_AT_specification, cu))
10726 struct dwarf2_cu *spec_cu = cu;
10728 return die_needs_namespace (die_specification (die, &spec_cu),
10732 attr = dwarf2_attr (die, DW_AT_external, cu);
10733 if (attr == NULL && die->parent->tag != DW_TAG_namespace
10734 && die->parent->tag != DW_TAG_module)
10736 /* A variable in a lexical block of some kind does not need a
10737 namespace, even though in C++ such variables may be external
10738 and have a mangled name. */
10739 if (die->parent->tag == DW_TAG_lexical_block
10740 || die->parent->tag == DW_TAG_try_block
10741 || die->parent->tag == DW_TAG_catch_block
10742 || die->parent->tag == DW_TAG_subprogram)
10751 /* Return the DIE's linkage name attribute, either DW_AT_linkage_name
10752 or DW_AT_MIPS_linkage_name. Returns NULL if the attribute is not
10753 defined for the given DIE. */
10755 static struct attribute *
10756 dw2_linkage_name_attr (struct die_info *die, struct dwarf2_cu *cu)
10758 struct attribute *attr;
10760 attr = dwarf2_attr (die, DW_AT_linkage_name, cu);
10762 attr = dwarf2_attr (die, DW_AT_MIPS_linkage_name, cu);
10767 /* Return the DIE's linkage name as a string, either DW_AT_linkage_name
10768 or DW_AT_MIPS_linkage_name. Returns NULL if the attribute is not
10769 defined for the given DIE. */
10771 static const char *
10772 dw2_linkage_name (struct die_info *die, struct dwarf2_cu *cu)
10774 const char *linkage_name;
10776 linkage_name = dwarf2_string_attr (die, DW_AT_linkage_name, cu);
10777 if (linkage_name == NULL)
10778 linkage_name = dwarf2_string_attr (die, DW_AT_MIPS_linkage_name, cu);
10780 return linkage_name;
10783 /* Compute the fully qualified name of DIE in CU. If PHYSNAME is nonzero,
10784 compute the physname for the object, which include a method's:
10785 - formal parameters (C++),
10786 - receiver type (Go),
10788 The term "physname" is a bit confusing.
10789 For C++, for example, it is the demangled name.
10790 For Go, for example, it's the mangled name.
10792 For Ada, return the DIE's linkage name rather than the fully qualified
10793 name. PHYSNAME is ignored..
10795 The result is allocated on the objfile_obstack and canonicalized. */
10797 static const char *
10798 dwarf2_compute_name (const char *name,
10799 struct die_info *die, struct dwarf2_cu *cu,
10802 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
10805 name = dwarf2_name (die, cu);
10807 /* For Fortran GDB prefers DW_AT_*linkage_name for the physname if present
10808 but otherwise compute it by typename_concat inside GDB.
10809 FIXME: Actually this is not really true, or at least not always true.
10810 It's all very confusing. SYMBOL_SET_NAMES doesn't try to demangle
10811 Fortran names because there is no mangling standard. So new_symbol
10812 will set the demangled name to the result of dwarf2_full_name, and it is
10813 the demangled name that GDB uses if it exists. */
10814 if (cu->language == language_ada
10815 || (cu->language == language_fortran && physname))
10817 /* For Ada unit, we prefer the linkage name over the name, as
10818 the former contains the exported name, which the user expects
10819 to be able to reference. Ideally, we want the user to be able
10820 to reference this entity using either natural or linkage name,
10821 but we haven't started looking at this enhancement yet. */
10822 const char *linkage_name = dw2_linkage_name (die, cu);
10824 if (linkage_name != NULL)
10825 return linkage_name;
10828 /* These are the only languages we know how to qualify names in. */
10830 && (cu->language == language_cplus
10831 || cu->language == language_fortran || cu->language == language_d
10832 || cu->language == language_rust))
10834 if (die_needs_namespace (die, cu))
10836 const char *prefix;
10837 const char *canonical_name = NULL;
10841 prefix = determine_prefix (die, cu);
10842 if (*prefix != '\0')
10844 char *prefixed_name = typename_concat (NULL, prefix, name,
10847 buf.puts (prefixed_name);
10848 xfree (prefixed_name);
10853 /* Template parameters may be specified in the DIE's DW_AT_name, or
10854 as children with DW_TAG_template_type_param or
10855 DW_TAG_value_type_param. If the latter, add them to the name
10856 here. If the name already has template parameters, then
10857 skip this step; some versions of GCC emit both, and
10858 it is more efficient to use the pre-computed name.
10860 Something to keep in mind about this process: it is very
10861 unlikely, or in some cases downright impossible, to produce
10862 something that will match the mangled name of a function.
10863 If the definition of the function has the same debug info,
10864 we should be able to match up with it anyway. But fallbacks
10865 using the minimal symbol, for instance to find a method
10866 implemented in a stripped copy of libstdc++, will not work.
10867 If we do not have debug info for the definition, we will have to
10868 match them up some other way.
10870 When we do name matching there is a related problem with function
10871 templates; two instantiated function templates are allowed to
10872 differ only by their return types, which we do not add here. */
10874 if (cu->language == language_cplus && strchr (name, '<') == NULL)
10876 struct attribute *attr;
10877 struct die_info *child;
10880 die->building_fullname = 1;
10882 for (child = die->child; child != NULL; child = child->sibling)
10886 const gdb_byte *bytes;
10887 struct dwarf2_locexpr_baton *baton;
10890 if (child->tag != DW_TAG_template_type_param
10891 && child->tag != DW_TAG_template_value_param)
10902 attr = dwarf2_attr (child, DW_AT_type, cu);
10905 complaint (_("template parameter missing DW_AT_type"));
10906 buf.puts ("UNKNOWN_TYPE");
10909 type = die_type (child, cu);
10911 if (child->tag == DW_TAG_template_type_param)
10913 c_print_type (type, "", &buf, -1, 0, cu->language,
10914 &type_print_raw_options);
10918 attr = dwarf2_attr (child, DW_AT_const_value, cu);
10921 complaint (_("template parameter missing "
10922 "DW_AT_const_value"));
10923 buf.puts ("UNKNOWN_VALUE");
10927 dwarf2_const_value_attr (attr, type, name,
10928 &cu->comp_unit_obstack, cu,
10929 &value, &bytes, &baton);
10931 if (TYPE_NOSIGN (type))
10932 /* GDB prints characters as NUMBER 'CHAR'. If that's
10933 changed, this can use value_print instead. */
10934 c_printchar (value, type, &buf);
10937 struct value_print_options opts;
10940 v = dwarf2_evaluate_loc_desc (type, NULL,
10944 else if (bytes != NULL)
10946 v = allocate_value (type);
10947 memcpy (value_contents_writeable (v), bytes,
10948 TYPE_LENGTH (type));
10951 v = value_from_longest (type, value);
10953 /* Specify decimal so that we do not depend on
10955 get_formatted_print_options (&opts, 'd');
10957 value_print (v, &buf, &opts);
10962 die->building_fullname = 0;
10966 /* Close the argument list, with a space if necessary
10967 (nested templates). */
10968 if (!buf.empty () && buf.string ().back () == '>')
10975 /* For C++ methods, append formal parameter type
10976 information, if PHYSNAME. */
10978 if (physname && die->tag == DW_TAG_subprogram
10979 && cu->language == language_cplus)
10981 struct type *type = read_type_die (die, cu);
10983 c_type_print_args (type, &buf, 1, cu->language,
10984 &type_print_raw_options);
10986 if (cu->language == language_cplus)
10988 /* Assume that an artificial first parameter is
10989 "this", but do not crash if it is not. RealView
10990 marks unnamed (and thus unused) parameters as
10991 artificial; there is no way to differentiate
10993 if (TYPE_NFIELDS (type) > 0
10994 && TYPE_FIELD_ARTIFICIAL (type, 0)
10995 && TYPE_CODE (TYPE_FIELD_TYPE (type, 0)) == TYPE_CODE_PTR
10996 && TYPE_CONST (TYPE_TARGET_TYPE (TYPE_FIELD_TYPE (type,
10998 buf.puts (" const");
11002 const std::string &intermediate_name = buf.string ();
11004 if (cu->language == language_cplus)
11006 = dwarf2_canonicalize_name (intermediate_name.c_str (), cu,
11007 &objfile->per_bfd->storage_obstack);
11009 /* If we only computed INTERMEDIATE_NAME, or if
11010 INTERMEDIATE_NAME is already canonical, then we need to
11011 copy it to the appropriate obstack. */
11012 if (canonical_name == NULL || canonical_name == intermediate_name.c_str ())
11013 name = ((const char *)
11014 obstack_copy0 (&objfile->per_bfd->storage_obstack,
11015 intermediate_name.c_str (),
11016 intermediate_name.length ()));
11018 name = canonical_name;
11025 /* Return the fully qualified name of DIE, based on its DW_AT_name.
11026 If scope qualifiers are appropriate they will be added. The result
11027 will be allocated on the storage_obstack, or NULL if the DIE does
11028 not have a name. NAME may either be from a previous call to
11029 dwarf2_name or NULL.
11031 The output string will be canonicalized (if C++). */
11033 static const char *
11034 dwarf2_full_name (const char *name, struct die_info *die, struct dwarf2_cu *cu)
11036 return dwarf2_compute_name (name, die, cu, 0);
11039 /* Construct a physname for the given DIE in CU. NAME may either be
11040 from a previous call to dwarf2_name or NULL. The result will be
11041 allocated on the objfile_objstack or NULL if the DIE does not have a
11044 The output string will be canonicalized (if C++). */
11046 static const char *
11047 dwarf2_physname (const char *name, struct die_info *die, struct dwarf2_cu *cu)
11049 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
11050 const char *retval, *mangled = NULL, *canon = NULL;
11053 /* In this case dwarf2_compute_name is just a shortcut not building anything
11055 if (!die_needs_namespace (die, cu))
11056 return dwarf2_compute_name (name, die, cu, 1);
11058 mangled = dw2_linkage_name (die, cu);
11060 /* rustc emits invalid values for DW_AT_linkage_name. Ignore these.
11061 See https://github.com/rust-lang/rust/issues/32925. */
11062 if (cu->language == language_rust && mangled != NULL
11063 && strchr (mangled, '{') != NULL)
11066 /* DW_AT_linkage_name is missing in some cases - depend on what GDB
11068 gdb::unique_xmalloc_ptr<char> demangled;
11069 if (mangled != NULL)
11072 if (language_def (cu->language)->la_store_sym_names_in_linkage_form_p)
11074 /* Do nothing (do not demangle the symbol name). */
11076 else if (cu->language == language_go)
11078 /* This is a lie, but we already lie to the caller new_symbol.
11079 new_symbol assumes we return the mangled name.
11080 This just undoes that lie until things are cleaned up. */
11084 /* Use DMGL_RET_DROP for C++ template functions to suppress
11085 their return type. It is easier for GDB users to search
11086 for such functions as `name(params)' than `long name(params)'.
11087 In such case the minimal symbol names do not match the full
11088 symbol names but for template functions there is never a need
11089 to look up their definition from their declaration so
11090 the only disadvantage remains the minimal symbol variant
11091 `long name(params)' does not have the proper inferior type. */
11092 demangled.reset (gdb_demangle (mangled,
11093 (DMGL_PARAMS | DMGL_ANSI
11094 | DMGL_RET_DROP)));
11097 canon = demangled.get ();
11105 if (canon == NULL || check_physname)
11107 const char *physname = dwarf2_compute_name (name, die, cu, 1);
11109 if (canon != NULL && strcmp (physname, canon) != 0)
11111 /* It may not mean a bug in GDB. The compiler could also
11112 compute DW_AT_linkage_name incorrectly. But in such case
11113 GDB would need to be bug-to-bug compatible. */
11115 complaint (_("Computed physname <%s> does not match demangled <%s> "
11116 "(from linkage <%s>) - DIE at %s [in module %s]"),
11117 physname, canon, mangled, sect_offset_str (die->sect_off),
11118 objfile_name (objfile));
11120 /* Prefer DW_AT_linkage_name (in the CANON form) - when it
11121 is available here - over computed PHYSNAME. It is safer
11122 against both buggy GDB and buggy compilers. */
11136 retval = ((const char *)
11137 obstack_copy0 (&objfile->per_bfd->storage_obstack,
11138 retval, strlen (retval)));
11143 /* Inspect DIE in CU for a namespace alias. If one exists, record
11144 a new symbol for it.
11146 Returns 1 if a namespace alias was recorded, 0 otherwise. */
11149 read_namespace_alias (struct die_info *die, struct dwarf2_cu *cu)
11151 struct attribute *attr;
11153 /* If the die does not have a name, this is not a namespace
11155 attr = dwarf2_attr (die, DW_AT_name, cu);
11159 struct die_info *d = die;
11160 struct dwarf2_cu *imported_cu = cu;
11162 /* If the compiler has nested DW_AT_imported_declaration DIEs,
11163 keep inspecting DIEs until we hit the underlying import. */
11164 #define MAX_NESTED_IMPORTED_DECLARATIONS 100
11165 for (num = 0; num < MAX_NESTED_IMPORTED_DECLARATIONS; ++num)
11167 attr = dwarf2_attr (d, DW_AT_import, cu);
11171 d = follow_die_ref (d, attr, &imported_cu);
11172 if (d->tag != DW_TAG_imported_declaration)
11176 if (num == MAX_NESTED_IMPORTED_DECLARATIONS)
11178 complaint (_("DIE at %s has too many recursively imported "
11179 "declarations"), sect_offset_str (d->sect_off));
11186 sect_offset sect_off = dwarf2_get_ref_die_offset (attr);
11188 type = get_die_type_at_offset (sect_off, cu->per_cu);
11189 if (type != NULL && TYPE_CODE (type) == TYPE_CODE_NAMESPACE)
11191 /* This declaration is a global namespace alias. Add
11192 a symbol for it whose type is the aliased namespace. */
11193 new_symbol (die, type, cu);
11202 /* Return the using directives repository (global or local?) to use in the
11203 current context for CU.
11205 For Ada, imported declarations can materialize renamings, which *may* be
11206 global. However it is impossible (for now?) in DWARF to distinguish
11207 "external" imported declarations and "static" ones. As all imported
11208 declarations seem to be static in all other languages, make them all CU-wide
11209 global only in Ada. */
11211 static struct using_direct **
11212 using_directives (struct dwarf2_cu *cu)
11214 if (cu->language == language_ada
11215 && cu->get_builder ()->outermost_context_p ())
11216 return cu->get_builder ()->get_global_using_directives ();
11218 return cu->get_builder ()->get_local_using_directives ();
11221 /* Read the import statement specified by the given die and record it. */
11224 read_import_statement (struct die_info *die, struct dwarf2_cu *cu)
11226 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
11227 struct attribute *import_attr;
11228 struct die_info *imported_die, *child_die;
11229 struct dwarf2_cu *imported_cu;
11230 const char *imported_name;
11231 const char *imported_name_prefix;
11232 const char *canonical_name;
11233 const char *import_alias;
11234 const char *imported_declaration = NULL;
11235 const char *import_prefix;
11236 std::vector<const char *> excludes;
11238 import_attr = dwarf2_attr (die, DW_AT_import, cu);
11239 if (import_attr == NULL)
11241 complaint (_("Tag '%s' has no DW_AT_import"),
11242 dwarf_tag_name (die->tag));
11247 imported_die = follow_die_ref_or_sig (die, import_attr, &imported_cu);
11248 imported_name = dwarf2_name (imported_die, imported_cu);
11249 if (imported_name == NULL)
11251 /* GCC bug: https://bugzilla.redhat.com/show_bug.cgi?id=506524
11253 The import in the following code:
11267 <2><51>: Abbrev Number: 3 (DW_TAG_imported_declaration)
11268 <52> DW_AT_decl_file : 1
11269 <53> DW_AT_decl_line : 6
11270 <54> DW_AT_import : <0x75>
11271 <2><58>: Abbrev Number: 4 (DW_TAG_typedef)
11272 <59> DW_AT_name : B
11273 <5b> DW_AT_decl_file : 1
11274 <5c> DW_AT_decl_line : 2
11275 <5d> DW_AT_type : <0x6e>
11277 <1><75>: Abbrev Number: 7 (DW_TAG_base_type)
11278 <76> DW_AT_byte_size : 4
11279 <77> DW_AT_encoding : 5 (signed)
11281 imports the wrong die ( 0x75 instead of 0x58 ).
11282 This case will be ignored until the gcc bug is fixed. */
11286 /* Figure out the local name after import. */
11287 import_alias = dwarf2_name (die, cu);
11289 /* Figure out where the statement is being imported to. */
11290 import_prefix = determine_prefix (die, cu);
11292 /* Figure out what the scope of the imported die is and prepend it
11293 to the name of the imported die. */
11294 imported_name_prefix = determine_prefix (imported_die, imported_cu);
11296 if (imported_die->tag != DW_TAG_namespace
11297 && imported_die->tag != DW_TAG_module)
11299 imported_declaration = imported_name;
11300 canonical_name = imported_name_prefix;
11302 else if (strlen (imported_name_prefix) > 0)
11303 canonical_name = obconcat (&objfile->objfile_obstack,
11304 imported_name_prefix,
11305 (cu->language == language_d ? "." : "::"),
11306 imported_name, (char *) NULL);
11308 canonical_name = imported_name;
11310 if (die->tag == DW_TAG_imported_module && cu->language == language_fortran)
11311 for (child_die = die->child; child_die && child_die->tag;
11312 child_die = sibling_die (child_die))
11314 /* DWARF-4: A Fortran use statement with a “rename list” may be
11315 represented by an imported module entry with an import attribute
11316 referring to the module and owned entries corresponding to those
11317 entities that are renamed as part of being imported. */
11319 if (child_die->tag != DW_TAG_imported_declaration)
11321 complaint (_("child DW_TAG_imported_declaration expected "
11322 "- DIE at %s [in module %s]"),
11323 sect_offset_str (child_die->sect_off),
11324 objfile_name (objfile));
11328 import_attr = dwarf2_attr (child_die, DW_AT_import, cu);
11329 if (import_attr == NULL)
11331 complaint (_("Tag '%s' has no DW_AT_import"),
11332 dwarf_tag_name (child_die->tag));
11337 imported_die = follow_die_ref_or_sig (child_die, import_attr,
11339 imported_name = dwarf2_name (imported_die, imported_cu);
11340 if (imported_name == NULL)
11342 complaint (_("child DW_TAG_imported_declaration has unknown "
11343 "imported name - DIE at %s [in module %s]"),
11344 sect_offset_str (child_die->sect_off),
11345 objfile_name (objfile));
11349 excludes.push_back (imported_name);
11351 process_die (child_die, cu);
11354 add_using_directive (using_directives (cu),
11358 imported_declaration,
11361 &objfile->objfile_obstack);
11364 /* ICC<14 does not output the required DW_AT_declaration on incomplete
11365 types, but gives them a size of zero. Starting with version 14,
11366 ICC is compatible with GCC. */
11369 producer_is_icc_lt_14 (struct dwarf2_cu *cu)
11371 if (!cu->checked_producer)
11372 check_producer (cu);
11374 return cu->producer_is_icc_lt_14;
11377 /* ICC generates a DW_AT_type for C void functions. This was observed on
11378 ICC 14.0.5.212, and appears to be against the DWARF spec (V5 3.3.2)
11379 which says that void functions should not have a DW_AT_type. */
11382 producer_is_icc (struct dwarf2_cu *cu)
11384 if (!cu->checked_producer)
11385 check_producer (cu);
11387 return cu->producer_is_icc;
11390 /* Check for possibly missing DW_AT_comp_dir with relative .debug_line
11391 directory paths. GCC SVN r127613 (new option -fdebug-prefix-map) fixed
11392 this, it was first present in GCC release 4.3.0. */
11395 producer_is_gcc_lt_4_3 (struct dwarf2_cu *cu)
11397 if (!cu->checked_producer)
11398 check_producer (cu);
11400 return cu->producer_is_gcc_lt_4_3;
11403 static file_and_directory
11404 find_file_and_directory (struct die_info *die, struct dwarf2_cu *cu)
11406 file_and_directory res;
11408 /* Find the filename. Do not use dwarf2_name here, since the filename
11409 is not a source language identifier. */
11410 res.name = dwarf2_string_attr (die, DW_AT_name, cu);
11411 res.comp_dir = dwarf2_string_attr (die, DW_AT_comp_dir, cu);
11413 if (res.comp_dir == NULL
11414 && producer_is_gcc_lt_4_3 (cu) && res.name != NULL
11415 && IS_ABSOLUTE_PATH (res.name))
11417 res.comp_dir_storage = ldirname (res.name);
11418 if (!res.comp_dir_storage.empty ())
11419 res.comp_dir = res.comp_dir_storage.c_str ();
11421 if (res.comp_dir != NULL)
11423 /* Irix 6.2 native cc prepends <machine>.: to the compilation
11424 directory, get rid of it. */
11425 const char *cp = strchr (res.comp_dir, ':');
11427 if (cp && cp != res.comp_dir && cp[-1] == '.' && cp[1] == '/')
11428 res.comp_dir = cp + 1;
11431 if (res.name == NULL)
11432 res.name = "<unknown>";
11437 /* Handle DW_AT_stmt_list for a compilation unit.
11438 DIE is the DW_TAG_compile_unit die for CU.
11439 COMP_DIR is the compilation directory. LOWPC is passed to
11440 dwarf_decode_lines. See dwarf_decode_lines comments about it. */
11443 handle_DW_AT_stmt_list (struct die_info *die, struct dwarf2_cu *cu,
11444 const char *comp_dir, CORE_ADDR lowpc) /* ARI: editCase function */
11446 struct dwarf2_per_objfile *dwarf2_per_objfile
11447 = cu->per_cu->dwarf2_per_objfile;
11448 struct objfile *objfile = dwarf2_per_objfile->objfile;
11449 struct attribute *attr;
11450 struct line_header line_header_local;
11451 hashval_t line_header_local_hash;
11453 int decode_mapping;
11455 gdb_assert (! cu->per_cu->is_debug_types);
11457 attr = dwarf2_attr (die, DW_AT_stmt_list, cu);
11461 sect_offset line_offset = (sect_offset) DW_UNSND (attr);
11463 /* The line header hash table is only created if needed (it exists to
11464 prevent redundant reading of the line table for partial_units).
11465 If we're given a partial_unit, we'll need it. If we're given a
11466 compile_unit, then use the line header hash table if it's already
11467 created, but don't create one just yet. */
11469 if (dwarf2_per_objfile->line_header_hash == NULL
11470 && die->tag == DW_TAG_partial_unit)
11472 dwarf2_per_objfile->line_header_hash
11473 = htab_create_alloc_ex (127, line_header_hash_voidp,
11474 line_header_eq_voidp,
11475 free_line_header_voidp,
11476 &objfile->objfile_obstack,
11477 hashtab_obstack_allocate,
11478 dummy_obstack_deallocate);
11481 line_header_local.sect_off = line_offset;
11482 line_header_local.offset_in_dwz = cu->per_cu->is_dwz;
11483 line_header_local_hash = line_header_hash (&line_header_local);
11484 if (dwarf2_per_objfile->line_header_hash != NULL)
11486 slot = htab_find_slot_with_hash (dwarf2_per_objfile->line_header_hash,
11487 &line_header_local,
11488 line_header_local_hash, NO_INSERT);
11490 /* For DW_TAG_compile_unit we need info like symtab::linetable which
11491 is not present in *SLOT (since if there is something in *SLOT then
11492 it will be for a partial_unit). */
11493 if (die->tag == DW_TAG_partial_unit && slot != NULL)
11495 gdb_assert (*slot != NULL);
11496 cu->line_header = (struct line_header *) *slot;
11501 /* dwarf_decode_line_header does not yet provide sufficient information.
11502 We always have to call also dwarf_decode_lines for it. */
11503 line_header_up lh = dwarf_decode_line_header (line_offset, cu);
11507 cu->line_header = lh.release ();
11508 cu->line_header_die_owner = die;
11510 if (dwarf2_per_objfile->line_header_hash == NULL)
11514 slot = htab_find_slot_with_hash (dwarf2_per_objfile->line_header_hash,
11515 &line_header_local,
11516 line_header_local_hash, INSERT);
11517 gdb_assert (slot != NULL);
11519 if (slot != NULL && *slot == NULL)
11521 /* This newly decoded line number information unit will be owned
11522 by line_header_hash hash table. */
11523 *slot = cu->line_header;
11524 cu->line_header_die_owner = NULL;
11528 /* We cannot free any current entry in (*slot) as that struct line_header
11529 may be already used by multiple CUs. Create only temporary decoded
11530 line_header for this CU - it may happen at most once for each line
11531 number information unit. And if we're not using line_header_hash
11532 then this is what we want as well. */
11533 gdb_assert (die->tag != DW_TAG_partial_unit);
11535 decode_mapping = (die->tag != DW_TAG_partial_unit);
11536 dwarf_decode_lines (cu->line_header, comp_dir, cu, NULL, lowpc,
11541 /* Process DW_TAG_compile_unit or DW_TAG_partial_unit. */
11544 read_file_scope (struct die_info *die, struct dwarf2_cu *cu)
11546 struct dwarf2_per_objfile *dwarf2_per_objfile
11547 = cu->per_cu->dwarf2_per_objfile;
11548 struct objfile *objfile = dwarf2_per_objfile->objfile;
11549 struct gdbarch *gdbarch = get_objfile_arch (objfile);
11550 CORE_ADDR lowpc = ((CORE_ADDR) -1);
11551 CORE_ADDR highpc = ((CORE_ADDR) 0);
11552 struct attribute *attr;
11553 struct die_info *child_die;
11554 CORE_ADDR baseaddr;
11556 prepare_one_comp_unit (cu, die, cu->language);
11557 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
11559 get_scope_pc_bounds (die, &lowpc, &highpc, cu);
11561 /* If we didn't find a lowpc, set it to highpc to avoid complaints
11562 from finish_block. */
11563 if (lowpc == ((CORE_ADDR) -1))
11565 lowpc = gdbarch_adjust_dwarf2_addr (gdbarch, lowpc + baseaddr);
11567 file_and_directory fnd = find_file_and_directory (die, cu);
11569 /* The XLCL doesn't generate DW_LANG_OpenCL because this attribute is not
11570 standardised yet. As a workaround for the language detection we fall
11571 back to the DW_AT_producer string. */
11572 if (cu->producer && strstr (cu->producer, "IBM XL C for OpenCL") != NULL)
11573 cu->language = language_opencl;
11575 /* Similar hack for Go. */
11576 if (cu->producer && strstr (cu->producer, "GNU Go ") != NULL)
11577 set_cu_language (DW_LANG_Go, cu);
11579 cu->start_symtab (fnd.name, fnd.comp_dir, lowpc);
11581 /* Decode line number information if present. We do this before
11582 processing child DIEs, so that the line header table is available
11583 for DW_AT_decl_file. */
11584 handle_DW_AT_stmt_list (die, cu, fnd.comp_dir, lowpc);
11586 /* Process all dies in compilation unit. */
11587 if (die->child != NULL)
11589 child_die = die->child;
11590 while (child_die && child_die->tag)
11592 process_die (child_die, cu);
11593 child_die = sibling_die (child_die);
11597 /* Decode macro information, if present. Dwarf 2 macro information
11598 refers to information in the line number info statement program
11599 header, so we can only read it if we've read the header
11601 attr = dwarf2_attr (die, DW_AT_macros, cu);
11603 attr = dwarf2_attr (die, DW_AT_GNU_macros, cu);
11604 if (attr && cu->line_header)
11606 if (dwarf2_attr (die, DW_AT_macro_info, cu))
11607 complaint (_("CU refers to both DW_AT_macros and DW_AT_macro_info"));
11609 dwarf_decode_macros (cu, DW_UNSND (attr), 1);
11613 attr = dwarf2_attr (die, DW_AT_macro_info, cu);
11614 if (attr && cu->line_header)
11616 unsigned int macro_offset = DW_UNSND (attr);
11618 dwarf_decode_macros (cu, macro_offset, 0);
11624 dwarf2_cu::setup_type_unit_groups (struct die_info *die)
11626 struct type_unit_group *tu_group;
11628 struct attribute *attr;
11630 struct signatured_type *sig_type;
11632 gdb_assert (per_cu->is_debug_types);
11633 sig_type = (struct signatured_type *) per_cu;
11635 attr = dwarf2_attr (die, DW_AT_stmt_list, this);
11637 /* If we're using .gdb_index (includes -readnow) then
11638 per_cu->type_unit_group may not have been set up yet. */
11639 if (sig_type->type_unit_group == NULL)
11640 sig_type->type_unit_group = get_type_unit_group (this, attr);
11641 tu_group = sig_type->type_unit_group;
11643 /* If we've already processed this stmt_list there's no real need to
11644 do it again, we could fake it and just recreate the part we need
11645 (file name,index -> symtab mapping). If data shows this optimization
11646 is useful we can do it then. */
11647 first_time = tu_group->compunit_symtab == NULL;
11649 /* We have to handle the case of both a missing DW_AT_stmt_list or bad
11654 sect_offset line_offset = (sect_offset) DW_UNSND (attr);
11655 lh = dwarf_decode_line_header (line_offset, this);
11660 start_symtab ("", NULL, 0);
11663 gdb_assert (tu_group->symtabs == NULL);
11664 gdb_assert (m_builder == nullptr);
11665 struct compunit_symtab *cust = tu_group->compunit_symtab;
11666 m_builder.reset (new struct buildsym_compunit
11667 (COMPUNIT_OBJFILE (cust), "",
11668 COMPUNIT_DIRNAME (cust),
11669 compunit_language (cust),
11675 line_header = lh.release ();
11676 line_header_die_owner = die;
11680 struct compunit_symtab *cust = start_symtab ("", 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 = line_header->file_names.size ();
11688 tu_group->symtabs = XNEWVEC (struct symtab *,
11689 line_header->file_names.size ());
11691 for (i = 0; i < line_header->file_names.size (); ++i)
11693 file_entry &fe = line_header->file_names[i];
11695 dwarf2_start_subfile (this, fe.name,
11696 fe.include_dir (line_header));
11697 buildsym_compunit *b = get_builder ();
11698 if (b->get_current_subfile ()->symtab == NULL)
11700 /* NOTE: start_subfile will recognize when it's been
11701 passed a file it has already seen. So we can't
11702 assume there's a simple mapping from
11703 cu->line_header->file_names to subfiles, plus
11704 cu->line_header->file_names may contain dups. */
11705 b->get_current_subfile ()->symtab
11706 = allocate_symtab (cust, b->get_current_subfile ()->name);
11709 fe.symtab = b->get_current_subfile ()->symtab;
11710 tu_group->symtabs[i] = fe.symtab;
11715 gdb_assert (m_builder == nullptr);
11716 struct compunit_symtab *cust = tu_group->compunit_symtab;
11717 m_builder.reset (new struct buildsym_compunit
11718 (COMPUNIT_OBJFILE (cust), "",
11719 COMPUNIT_DIRNAME (cust),
11720 compunit_language (cust),
11723 for (i = 0; i < line_header->file_names.size (); ++i)
11725 file_entry &fe = line_header->file_names[i];
11727 fe.symtab = tu_group->symtabs[i];
11731 /* The main symtab is allocated last. Type units don't have DW_AT_name
11732 so they don't have a "real" (so to speak) symtab anyway.
11733 There is later code that will assign the main symtab to all symbols
11734 that don't have one. We need to handle the case of a symbol with a
11735 missing symtab (DW_AT_decl_file) anyway. */
11738 /* Process DW_TAG_type_unit.
11739 For TUs we want to skip the first top level sibling if it's not the
11740 actual type being defined by this TU. In this case the first top
11741 level sibling is there to provide context only. */
11744 read_type_unit_scope (struct die_info *die, struct dwarf2_cu *cu)
11746 struct die_info *child_die;
11748 prepare_one_comp_unit (cu, die, language_minimal);
11750 /* Initialize (or reinitialize) the machinery for building symtabs.
11751 We do this before processing child DIEs, so that the line header table
11752 is available for DW_AT_decl_file. */
11753 cu->setup_type_unit_groups (die);
11755 if (die->child != NULL)
11757 child_die = die->child;
11758 while (child_die && child_die->tag)
11760 process_die (child_die, cu);
11761 child_die = sibling_die (child_die);
11768 http://gcc.gnu.org/wiki/DebugFission
11769 http://gcc.gnu.org/wiki/DebugFissionDWP
11771 To simplify handling of both DWO files ("object" files with the DWARF info)
11772 and DWP files (a file with the DWOs packaged up into one file), we treat
11773 DWP files as having a collection of virtual DWO files. */
11776 hash_dwo_file (const void *item)
11778 const struct dwo_file *dwo_file = (const struct dwo_file *) item;
11781 hash = htab_hash_string (dwo_file->dwo_name);
11782 if (dwo_file->comp_dir != NULL)
11783 hash += htab_hash_string (dwo_file->comp_dir);
11788 eq_dwo_file (const void *item_lhs, const void *item_rhs)
11790 const struct dwo_file *lhs = (const struct dwo_file *) item_lhs;
11791 const struct dwo_file *rhs = (const struct dwo_file *) item_rhs;
11793 if (strcmp (lhs->dwo_name, rhs->dwo_name) != 0)
11795 if (lhs->comp_dir == NULL || rhs->comp_dir == NULL)
11796 return lhs->comp_dir == rhs->comp_dir;
11797 return strcmp (lhs->comp_dir, rhs->comp_dir) == 0;
11800 /* Allocate a hash table for DWO files. */
11803 allocate_dwo_file_hash_table (struct objfile *objfile)
11805 return htab_create_alloc_ex (41,
11809 &objfile->objfile_obstack,
11810 hashtab_obstack_allocate,
11811 dummy_obstack_deallocate);
11814 /* Lookup DWO file DWO_NAME. */
11817 lookup_dwo_file_slot (struct dwarf2_per_objfile *dwarf2_per_objfile,
11818 const char *dwo_name,
11819 const char *comp_dir)
11821 struct dwo_file find_entry;
11824 if (dwarf2_per_objfile->dwo_files == NULL)
11825 dwarf2_per_objfile->dwo_files
11826 = allocate_dwo_file_hash_table (dwarf2_per_objfile->objfile);
11828 memset (&find_entry, 0, sizeof (find_entry));
11829 find_entry.dwo_name = dwo_name;
11830 find_entry.comp_dir = comp_dir;
11831 slot = htab_find_slot (dwarf2_per_objfile->dwo_files, &find_entry, INSERT);
11837 hash_dwo_unit (const void *item)
11839 const struct dwo_unit *dwo_unit = (const struct dwo_unit *) item;
11841 /* This drops the top 32 bits of the id, but is ok for a hash. */
11842 return dwo_unit->signature;
11846 eq_dwo_unit (const void *item_lhs, const void *item_rhs)
11848 const struct dwo_unit *lhs = (const struct dwo_unit *) item_lhs;
11849 const struct dwo_unit *rhs = (const struct dwo_unit *) item_rhs;
11851 /* The signature is assumed to be unique within the DWO file.
11852 So while object file CU dwo_id's always have the value zero,
11853 that's OK, assuming each object file DWO file has only one CU,
11854 and that's the rule for now. */
11855 return lhs->signature == rhs->signature;
11858 /* Allocate a hash table for DWO CUs,TUs.
11859 There is one of these tables for each of CUs,TUs for each DWO file. */
11862 allocate_dwo_unit_table (struct objfile *objfile)
11864 /* Start out with a pretty small number.
11865 Generally DWO files contain only one CU and maybe some TUs. */
11866 return htab_create_alloc_ex (3,
11870 &objfile->objfile_obstack,
11871 hashtab_obstack_allocate,
11872 dummy_obstack_deallocate);
11875 /* Structure used to pass data to create_dwo_debug_info_hash_table_reader. */
11877 struct create_dwo_cu_data
11879 struct dwo_file *dwo_file;
11880 struct dwo_unit dwo_unit;
11883 /* die_reader_func for create_dwo_cu. */
11886 create_dwo_cu_reader (const struct die_reader_specs *reader,
11887 const gdb_byte *info_ptr,
11888 struct die_info *comp_unit_die,
11892 struct dwarf2_cu *cu = reader->cu;
11893 sect_offset sect_off = cu->per_cu->sect_off;
11894 struct dwarf2_section_info *section = cu->per_cu->section;
11895 struct create_dwo_cu_data *data = (struct create_dwo_cu_data *) datap;
11896 struct dwo_file *dwo_file = data->dwo_file;
11897 struct dwo_unit *dwo_unit = &data->dwo_unit;
11898 struct attribute *attr;
11900 attr = dwarf2_attr (comp_unit_die, DW_AT_GNU_dwo_id, cu);
11903 complaint (_("Dwarf Error: debug entry at offset %s is missing"
11904 " its dwo_id [in module %s]"),
11905 sect_offset_str (sect_off), dwo_file->dwo_name);
11909 dwo_unit->dwo_file = dwo_file;
11910 dwo_unit->signature = DW_UNSND (attr);
11911 dwo_unit->section = section;
11912 dwo_unit->sect_off = sect_off;
11913 dwo_unit->length = cu->per_cu->length;
11915 if (dwarf_read_debug)
11916 fprintf_unfiltered (gdb_stdlog, " offset %s, dwo_id %s\n",
11917 sect_offset_str (sect_off),
11918 hex_string (dwo_unit->signature));
11921 /* Create the dwo_units for the CUs in a DWO_FILE.
11922 Note: This function processes DWO files only, not DWP files. */
11925 create_cus_hash_table (struct dwarf2_per_objfile *dwarf2_per_objfile,
11926 struct dwo_file &dwo_file, dwarf2_section_info §ion,
11929 struct objfile *objfile = dwarf2_per_objfile->objfile;
11930 const gdb_byte *info_ptr, *end_ptr;
11932 dwarf2_read_section (objfile, §ion);
11933 info_ptr = section.buffer;
11935 if (info_ptr == NULL)
11938 if (dwarf_read_debug)
11940 fprintf_unfiltered (gdb_stdlog, "Reading %s for %s:\n",
11941 get_section_name (§ion),
11942 get_section_file_name (§ion));
11945 end_ptr = info_ptr + section.size;
11946 while (info_ptr < end_ptr)
11948 struct dwarf2_per_cu_data per_cu;
11949 struct create_dwo_cu_data create_dwo_cu_data;
11950 struct dwo_unit *dwo_unit;
11952 sect_offset sect_off = (sect_offset) (info_ptr - section.buffer);
11954 memset (&create_dwo_cu_data.dwo_unit, 0,
11955 sizeof (create_dwo_cu_data.dwo_unit));
11956 memset (&per_cu, 0, sizeof (per_cu));
11957 per_cu.dwarf2_per_objfile = dwarf2_per_objfile;
11958 per_cu.is_debug_types = 0;
11959 per_cu.sect_off = sect_offset (info_ptr - section.buffer);
11960 per_cu.section = §ion;
11961 create_dwo_cu_data.dwo_file = &dwo_file;
11963 init_cutu_and_read_dies_no_follow (
11964 &per_cu, &dwo_file, create_dwo_cu_reader, &create_dwo_cu_data);
11965 info_ptr += per_cu.length;
11967 // If the unit could not be parsed, skip it.
11968 if (create_dwo_cu_data.dwo_unit.dwo_file == NULL)
11971 if (cus_htab == NULL)
11972 cus_htab = allocate_dwo_unit_table (objfile);
11974 dwo_unit = OBSTACK_ZALLOC (&objfile->objfile_obstack, struct dwo_unit);
11975 *dwo_unit = create_dwo_cu_data.dwo_unit;
11976 slot = htab_find_slot (cus_htab, dwo_unit, INSERT);
11977 gdb_assert (slot != NULL);
11980 const struct dwo_unit *dup_cu = (const struct dwo_unit *)*slot;
11981 sect_offset dup_sect_off = dup_cu->sect_off;
11983 complaint (_("debug cu entry at offset %s is duplicate to"
11984 " the entry at offset %s, signature %s"),
11985 sect_offset_str (sect_off), sect_offset_str (dup_sect_off),
11986 hex_string (dwo_unit->signature));
11988 *slot = (void *)dwo_unit;
11992 /* DWP file .debug_{cu,tu}_index section format:
11993 [ref: http://gcc.gnu.org/wiki/DebugFissionDWP]
11997 Both index sections have the same format, and serve to map a 64-bit
11998 signature to a set of section numbers. Each section begins with a header,
11999 followed by a hash table of 64-bit signatures, a parallel table of 32-bit
12000 indexes, and a pool of 32-bit section numbers. The index sections will be
12001 aligned at 8-byte boundaries in the file.
12003 The index section header consists of:
12005 V, 32 bit version number
12007 N, 32 bit number of compilation units or type units in the index
12008 M, 32 bit number of slots in the hash table
12010 Numbers are recorded using the byte order of the application binary.
12012 The hash table begins at offset 16 in the section, and consists of an array
12013 of M 64-bit slots. Each slot contains a 64-bit signature (using the byte
12014 order of the application binary). Unused slots in the hash table are 0.
12015 (We rely on the extreme unlikeliness of a signature being exactly 0.)
12017 The parallel table begins immediately after the hash table
12018 (at offset 16 + 8 * M from the beginning of the section), and consists of an
12019 array of 32-bit indexes (using the byte order of the application binary),
12020 corresponding 1-1 with slots in the hash table. Each entry in the parallel
12021 table contains a 32-bit index into the pool of section numbers. For unused
12022 hash table slots, the corresponding entry in the parallel table will be 0.
12024 The pool of section numbers begins immediately following the hash table
12025 (at offset 16 + 12 * M from the beginning of the section). The pool of
12026 section numbers consists of an array of 32-bit words (using the byte order
12027 of the application binary). Each item in the array is indexed starting
12028 from 0. The hash table entry provides the index of the first section
12029 number in the set. Additional section numbers in the set follow, and the
12030 set is terminated by a 0 entry (section number 0 is not used in ELF).
12032 In each set of section numbers, the .debug_info.dwo or .debug_types.dwo
12033 section must be the first entry in the set, and the .debug_abbrev.dwo must
12034 be the second entry. Other members of the set may follow in any order.
12040 DWP Version 2 combines all the .debug_info, etc. sections into one,
12041 and the entries in the index tables are now offsets into these sections.
12042 CU offsets begin at 0. TU offsets begin at the size of the .debug_info
12045 Index Section Contents:
12047 Hash Table of Signatures dwp_hash_table.hash_table
12048 Parallel Table of Indices dwp_hash_table.unit_table
12049 Table of Section Offsets dwp_hash_table.v2.{section_ids,offsets}
12050 Table of Section Sizes dwp_hash_table.v2.sizes
12052 The index section header consists of:
12054 V, 32 bit version number
12055 L, 32 bit number of columns in the table of section offsets
12056 N, 32 bit number of compilation units or type units in the index
12057 M, 32 bit number of slots in the hash table
12059 Numbers are recorded using the byte order of the application binary.
12061 The hash table has the same format as version 1.
12062 The parallel table of indices has the same format as version 1,
12063 except that the entries are origin-1 indices into the table of sections
12064 offsets and the table of section sizes.
12066 The table of offsets begins immediately following the parallel table
12067 (at offset 16 + 12 * M from the beginning of the section). The table is
12068 a two-dimensional array of 32-bit words (using the byte order of the
12069 application binary), with L columns and N+1 rows, in row-major order.
12070 Each row in the array is indexed starting from 0. The first row provides
12071 a key to the remaining rows: each column in this row provides an identifier
12072 for a debug section, and the offsets in the same column of subsequent rows
12073 refer to that section. The section identifiers are:
12075 DW_SECT_INFO 1 .debug_info.dwo
12076 DW_SECT_TYPES 2 .debug_types.dwo
12077 DW_SECT_ABBREV 3 .debug_abbrev.dwo
12078 DW_SECT_LINE 4 .debug_line.dwo
12079 DW_SECT_LOC 5 .debug_loc.dwo
12080 DW_SECT_STR_OFFSETS 6 .debug_str_offsets.dwo
12081 DW_SECT_MACINFO 7 .debug_macinfo.dwo
12082 DW_SECT_MACRO 8 .debug_macro.dwo
12084 The offsets provided by the CU and TU index sections are the base offsets
12085 for the contributions made by each CU or TU to the corresponding section
12086 in the package file. Each CU and TU header contains an abbrev_offset
12087 field, used to find the abbreviations table for that CU or TU within the
12088 contribution to the .debug_abbrev.dwo section for that CU or TU, and should
12089 be interpreted as relative to the base offset given in the index section.
12090 Likewise, offsets into .debug_line.dwo from DW_AT_stmt_list attributes
12091 should be interpreted as relative to the base offset for .debug_line.dwo,
12092 and offsets into other debug sections obtained from DWARF attributes should
12093 also be interpreted as relative to the corresponding base offset.
12095 The table of sizes begins immediately following the table of offsets.
12096 Like the table of offsets, it is a two-dimensional array of 32-bit words,
12097 with L columns and N rows, in row-major order. Each row in the array is
12098 indexed starting from 1 (row 0 is shared by the two tables).
12102 Hash table lookup is handled the same in version 1 and 2:
12104 We assume that N and M will not exceed 2^32 - 1.
12105 The size of the hash table, M, must be 2^k such that 2^k > 3*N/2.
12107 Given a 64-bit compilation unit signature or a type signature S, an entry
12108 in the hash table is located as follows:
12110 1) Calculate a primary hash H = S & MASK(k), where MASK(k) is a mask with
12111 the low-order k bits all set to 1.
12113 2) Calculate a secondary hash H' = (((S >> 32) & MASK(k)) | 1).
12115 3) If the hash table entry at index H matches the signature, use that
12116 entry. If the hash table entry at index H is unused (all zeroes),
12117 terminate the search: the signature is not present in the table.
12119 4) Let H = (H + H') modulo M. Repeat at Step 3.
12121 Because M > N and H' and M are relatively prime, the search is guaranteed
12122 to stop at an unused slot or find the match. */
12124 /* Create a hash table to map DWO IDs to their CU/TU entry in
12125 .debug_{info,types}.dwo in DWP_FILE.
12126 Returns NULL if there isn't one.
12127 Note: This function processes DWP files only, not DWO files. */
12129 static struct dwp_hash_table *
12130 create_dwp_hash_table (struct dwarf2_per_objfile *dwarf2_per_objfile,
12131 struct dwp_file *dwp_file, int is_debug_types)
12133 struct objfile *objfile = dwarf2_per_objfile->objfile;
12134 bfd *dbfd = dwp_file->dbfd.get ();
12135 const gdb_byte *index_ptr, *index_end;
12136 struct dwarf2_section_info *index;
12137 uint32_t version, nr_columns, nr_units, nr_slots;
12138 struct dwp_hash_table *htab;
12140 if (is_debug_types)
12141 index = &dwp_file->sections.tu_index;
12143 index = &dwp_file->sections.cu_index;
12145 if (dwarf2_section_empty_p (index))
12147 dwarf2_read_section (objfile, index);
12149 index_ptr = index->buffer;
12150 index_end = index_ptr + index->size;
12152 version = read_4_bytes (dbfd, index_ptr);
12155 nr_columns = read_4_bytes (dbfd, index_ptr);
12159 nr_units = read_4_bytes (dbfd, index_ptr);
12161 nr_slots = read_4_bytes (dbfd, index_ptr);
12164 if (version != 1 && version != 2)
12166 error (_("Dwarf Error: unsupported DWP file version (%s)"
12167 " [in module %s]"),
12168 pulongest (version), dwp_file->name);
12170 if (nr_slots != (nr_slots & -nr_slots))
12172 error (_("Dwarf Error: number of slots in DWP hash table (%s)"
12173 " is not power of 2 [in module %s]"),
12174 pulongest (nr_slots), dwp_file->name);
12177 htab = OBSTACK_ZALLOC (&objfile->objfile_obstack, struct dwp_hash_table);
12178 htab->version = version;
12179 htab->nr_columns = nr_columns;
12180 htab->nr_units = nr_units;
12181 htab->nr_slots = nr_slots;
12182 htab->hash_table = index_ptr;
12183 htab->unit_table = htab->hash_table + sizeof (uint64_t) * nr_slots;
12185 /* Exit early if the table is empty. */
12186 if (nr_slots == 0 || nr_units == 0
12187 || (version == 2 && nr_columns == 0))
12189 /* All must be zero. */
12190 if (nr_slots != 0 || nr_units != 0
12191 || (version == 2 && nr_columns != 0))
12193 complaint (_("Empty DWP but nr_slots,nr_units,nr_columns not"
12194 " all zero [in modules %s]"),
12202 htab->section_pool.v1.indices =
12203 htab->unit_table + sizeof (uint32_t) * nr_slots;
12204 /* It's harder to decide whether the section is too small in v1.
12205 V1 is deprecated anyway so we punt. */
12209 const gdb_byte *ids_ptr = htab->unit_table + sizeof (uint32_t) * nr_slots;
12210 int *ids = htab->section_pool.v2.section_ids;
12211 size_t sizeof_ids = sizeof (htab->section_pool.v2.section_ids);
12212 /* Reverse map for error checking. */
12213 int ids_seen[DW_SECT_MAX + 1];
12216 if (nr_columns < 2)
12218 error (_("Dwarf Error: bad DWP hash table, too few columns"
12219 " in section table [in module %s]"),
12222 if (nr_columns > MAX_NR_V2_DWO_SECTIONS)
12224 error (_("Dwarf Error: bad DWP hash table, too many columns"
12225 " in section table [in module %s]"),
12228 memset (ids, 255, sizeof_ids);
12229 memset (ids_seen, 255, sizeof (ids_seen));
12230 for (i = 0; i < nr_columns; ++i)
12232 int id = read_4_bytes (dbfd, ids_ptr + i * sizeof (uint32_t));
12234 if (id < DW_SECT_MIN || id > DW_SECT_MAX)
12236 error (_("Dwarf Error: bad DWP hash table, bad section id %d"
12237 " in section table [in module %s]"),
12238 id, dwp_file->name);
12240 if (ids_seen[id] != -1)
12242 error (_("Dwarf Error: bad DWP hash table, duplicate section"
12243 " id %d in section table [in module %s]"),
12244 id, dwp_file->name);
12249 /* Must have exactly one info or types section. */
12250 if (((ids_seen[DW_SECT_INFO] != -1)
12251 + (ids_seen[DW_SECT_TYPES] != -1))
12254 error (_("Dwarf Error: bad DWP hash table, missing/duplicate"
12255 " DWO info/types section [in module %s]"),
12258 /* Must have an abbrev section. */
12259 if (ids_seen[DW_SECT_ABBREV] == -1)
12261 error (_("Dwarf Error: bad DWP hash table, missing DWO abbrev"
12262 " section [in module %s]"),
12265 htab->section_pool.v2.offsets = ids_ptr + sizeof (uint32_t) * nr_columns;
12266 htab->section_pool.v2.sizes =
12267 htab->section_pool.v2.offsets + (sizeof (uint32_t)
12268 * nr_units * nr_columns);
12269 if ((htab->section_pool.v2.sizes + (sizeof (uint32_t)
12270 * nr_units * nr_columns))
12273 error (_("Dwarf Error: DWP index section is corrupt (too small)"
12274 " [in module %s]"),
12282 /* Update SECTIONS with the data from SECTP.
12284 This function is like the other "locate" section routines that are
12285 passed to bfd_map_over_sections, but in this context the sections to
12286 read comes from the DWP V1 hash table, not the full ELF section table.
12288 The result is non-zero for success, or zero if an error was found. */
12291 locate_v1_virtual_dwo_sections (asection *sectp,
12292 struct virtual_v1_dwo_sections *sections)
12294 const struct dwop_section_names *names = &dwop_section_names;
12296 if (section_is_p (sectp->name, &names->abbrev_dwo))
12298 /* There can be only one. */
12299 if (sections->abbrev.s.section != NULL)
12301 sections->abbrev.s.section = sectp;
12302 sections->abbrev.size = bfd_get_section_size (sectp);
12304 else if (section_is_p (sectp->name, &names->info_dwo)
12305 || section_is_p (sectp->name, &names->types_dwo))
12307 /* There can be only one. */
12308 if (sections->info_or_types.s.section != NULL)
12310 sections->info_or_types.s.section = sectp;
12311 sections->info_or_types.size = bfd_get_section_size (sectp);
12313 else if (section_is_p (sectp->name, &names->line_dwo))
12315 /* There can be only one. */
12316 if (sections->line.s.section != NULL)
12318 sections->line.s.section = sectp;
12319 sections->line.size = bfd_get_section_size (sectp);
12321 else if (section_is_p (sectp->name, &names->loc_dwo))
12323 /* There can be only one. */
12324 if (sections->loc.s.section != NULL)
12326 sections->loc.s.section = sectp;
12327 sections->loc.size = bfd_get_section_size (sectp);
12329 else if (section_is_p (sectp->name, &names->macinfo_dwo))
12331 /* There can be only one. */
12332 if (sections->macinfo.s.section != NULL)
12334 sections->macinfo.s.section = sectp;
12335 sections->macinfo.size = bfd_get_section_size (sectp);
12337 else if (section_is_p (sectp->name, &names->macro_dwo))
12339 /* There can be only one. */
12340 if (sections->macro.s.section != NULL)
12342 sections->macro.s.section = sectp;
12343 sections->macro.size = bfd_get_section_size (sectp);
12345 else if (section_is_p (sectp->name, &names->str_offsets_dwo))
12347 /* There can be only one. */
12348 if (sections->str_offsets.s.section != NULL)
12350 sections->str_offsets.s.section = sectp;
12351 sections->str_offsets.size = bfd_get_section_size (sectp);
12355 /* No other kind of section is valid. */
12362 /* Create a dwo_unit object for the DWO unit with signature SIGNATURE.
12363 UNIT_INDEX is the index of the DWO unit in the DWP hash table.
12364 COMP_DIR is the DW_AT_comp_dir attribute of the referencing CU.
12365 This is for DWP version 1 files. */
12367 static struct dwo_unit *
12368 create_dwo_unit_in_dwp_v1 (struct dwarf2_per_objfile *dwarf2_per_objfile,
12369 struct dwp_file *dwp_file,
12370 uint32_t unit_index,
12371 const char *comp_dir,
12372 ULONGEST signature, int is_debug_types)
12374 struct objfile *objfile = dwarf2_per_objfile->objfile;
12375 const struct dwp_hash_table *dwp_htab =
12376 is_debug_types ? dwp_file->tus : dwp_file->cus;
12377 bfd *dbfd = dwp_file->dbfd.get ();
12378 const char *kind = is_debug_types ? "TU" : "CU";
12379 struct dwo_file *dwo_file;
12380 struct dwo_unit *dwo_unit;
12381 struct virtual_v1_dwo_sections sections;
12382 void **dwo_file_slot;
12385 gdb_assert (dwp_file->version == 1);
12387 if (dwarf_read_debug)
12389 fprintf_unfiltered (gdb_stdlog, "Reading %s %s/%s in DWP V1 file: %s\n",
12391 pulongest (unit_index), hex_string (signature),
12395 /* Fetch the sections of this DWO unit.
12396 Put a limit on the number of sections we look for so that bad data
12397 doesn't cause us to loop forever. */
12399 #define MAX_NR_V1_DWO_SECTIONS \
12400 (1 /* .debug_info or .debug_types */ \
12401 + 1 /* .debug_abbrev */ \
12402 + 1 /* .debug_line */ \
12403 + 1 /* .debug_loc */ \
12404 + 1 /* .debug_str_offsets */ \
12405 + 1 /* .debug_macro or .debug_macinfo */ \
12406 + 1 /* trailing zero */)
12408 memset (§ions, 0, sizeof (sections));
12410 for (i = 0; i < MAX_NR_V1_DWO_SECTIONS; ++i)
12413 uint32_t section_nr =
12414 read_4_bytes (dbfd,
12415 dwp_htab->section_pool.v1.indices
12416 + (unit_index + i) * sizeof (uint32_t));
12418 if (section_nr == 0)
12420 if (section_nr >= dwp_file->num_sections)
12422 error (_("Dwarf Error: bad DWP hash table, section number too large"
12423 " [in module %s]"),
12427 sectp = dwp_file->elf_sections[section_nr];
12428 if (! locate_v1_virtual_dwo_sections (sectp, §ions))
12430 error (_("Dwarf Error: bad DWP hash table, invalid section found"
12431 " [in module %s]"),
12437 || dwarf2_section_empty_p (§ions.info_or_types)
12438 || dwarf2_section_empty_p (§ions.abbrev))
12440 error (_("Dwarf Error: bad DWP hash table, missing DWO sections"
12441 " [in module %s]"),
12444 if (i == MAX_NR_V1_DWO_SECTIONS)
12446 error (_("Dwarf Error: bad DWP hash table, too many DWO sections"
12447 " [in module %s]"),
12451 /* It's easier for the rest of the code if we fake a struct dwo_file and
12452 have dwo_unit "live" in that. At least for now.
12454 The DWP file can be made up of a random collection of CUs and TUs.
12455 However, for each CU + set of TUs that came from the same original DWO
12456 file, we can combine them back into a virtual DWO file to save space
12457 (fewer struct dwo_file objects to allocate). Remember that for really
12458 large apps there can be on the order of 8K CUs and 200K TUs, or more. */
12460 std::string virtual_dwo_name =
12461 string_printf ("virtual-dwo/%d-%d-%d-%d",
12462 get_section_id (§ions.abbrev),
12463 get_section_id (§ions.line),
12464 get_section_id (§ions.loc),
12465 get_section_id (§ions.str_offsets));
12466 /* Can we use an existing virtual DWO file? */
12467 dwo_file_slot = lookup_dwo_file_slot (dwarf2_per_objfile,
12468 virtual_dwo_name.c_str (),
12470 /* Create one if necessary. */
12471 if (*dwo_file_slot == NULL)
12473 if (dwarf_read_debug)
12475 fprintf_unfiltered (gdb_stdlog, "Creating virtual DWO: %s\n",
12476 virtual_dwo_name.c_str ());
12478 dwo_file = OBSTACK_ZALLOC (&objfile->objfile_obstack, struct dwo_file);
12480 = (const char *) obstack_copy0 (&objfile->objfile_obstack,
12481 virtual_dwo_name.c_str (),
12482 virtual_dwo_name.size ());
12483 dwo_file->comp_dir = comp_dir;
12484 dwo_file->sections.abbrev = sections.abbrev;
12485 dwo_file->sections.line = sections.line;
12486 dwo_file->sections.loc = sections.loc;
12487 dwo_file->sections.macinfo = sections.macinfo;
12488 dwo_file->sections.macro = sections.macro;
12489 dwo_file->sections.str_offsets = sections.str_offsets;
12490 /* The "str" section is global to the entire DWP file. */
12491 dwo_file->sections.str = dwp_file->sections.str;
12492 /* The info or types section is assigned below to dwo_unit,
12493 there's no need to record it in dwo_file.
12494 Also, we can't simply record type sections in dwo_file because
12495 we record a pointer into the vector in dwo_unit. As we collect more
12496 types we'll grow the vector and eventually have to reallocate space
12497 for it, invalidating all copies of pointers into the previous
12499 *dwo_file_slot = dwo_file;
12503 if (dwarf_read_debug)
12505 fprintf_unfiltered (gdb_stdlog, "Using existing virtual DWO: %s\n",
12506 virtual_dwo_name.c_str ());
12508 dwo_file = (struct dwo_file *) *dwo_file_slot;
12511 dwo_unit = OBSTACK_ZALLOC (&objfile->objfile_obstack, struct dwo_unit);
12512 dwo_unit->dwo_file = dwo_file;
12513 dwo_unit->signature = signature;
12514 dwo_unit->section =
12515 XOBNEW (&objfile->objfile_obstack, struct dwarf2_section_info);
12516 *dwo_unit->section = sections.info_or_types;
12517 /* dwo_unit->{offset,length,type_offset_in_tu} are set later. */
12522 /* Subroutine of create_dwo_unit_in_dwp_v2 to simplify it.
12523 Given a pointer to the containing section SECTION, and OFFSET,SIZE of the
12524 piece within that section used by a TU/CU, return a virtual section
12525 of just that piece. */
12527 static struct dwarf2_section_info
12528 create_dwp_v2_section (struct dwarf2_per_objfile *dwarf2_per_objfile,
12529 struct dwarf2_section_info *section,
12530 bfd_size_type offset, bfd_size_type size)
12532 struct dwarf2_section_info result;
12535 gdb_assert (section != NULL);
12536 gdb_assert (!section->is_virtual);
12538 memset (&result, 0, sizeof (result));
12539 result.s.containing_section = section;
12540 result.is_virtual = 1;
12545 sectp = get_section_bfd_section (section);
12547 /* Flag an error if the piece denoted by OFFSET,SIZE is outside the
12548 bounds of the real section. This is a pretty-rare event, so just
12549 flag an error (easier) instead of a warning and trying to cope. */
12551 || offset + size > bfd_get_section_size (sectp))
12553 error (_("Dwarf Error: Bad DWP V2 section info, doesn't fit"
12554 " in section %s [in module %s]"),
12555 sectp ? bfd_section_name (abfd, sectp) : "<unknown>",
12556 objfile_name (dwarf2_per_objfile->objfile));
12559 result.virtual_offset = offset;
12560 result.size = size;
12564 /* Create a dwo_unit object for the DWO unit with signature SIGNATURE.
12565 UNIT_INDEX is the index of the DWO unit in the DWP hash table.
12566 COMP_DIR is the DW_AT_comp_dir attribute of the referencing CU.
12567 This is for DWP version 2 files. */
12569 static struct dwo_unit *
12570 create_dwo_unit_in_dwp_v2 (struct dwarf2_per_objfile *dwarf2_per_objfile,
12571 struct dwp_file *dwp_file,
12572 uint32_t unit_index,
12573 const char *comp_dir,
12574 ULONGEST signature, int is_debug_types)
12576 struct objfile *objfile = dwarf2_per_objfile->objfile;
12577 const struct dwp_hash_table *dwp_htab =
12578 is_debug_types ? dwp_file->tus : dwp_file->cus;
12579 bfd *dbfd = dwp_file->dbfd.get ();
12580 const char *kind = is_debug_types ? "TU" : "CU";
12581 struct dwo_file *dwo_file;
12582 struct dwo_unit *dwo_unit;
12583 struct virtual_v2_dwo_sections sections;
12584 void **dwo_file_slot;
12587 gdb_assert (dwp_file->version == 2);
12589 if (dwarf_read_debug)
12591 fprintf_unfiltered (gdb_stdlog, "Reading %s %s/%s in DWP V2 file: %s\n",
12593 pulongest (unit_index), hex_string (signature),
12597 /* Fetch the section offsets of this DWO unit. */
12599 memset (§ions, 0, sizeof (sections));
12601 for (i = 0; i < dwp_htab->nr_columns; ++i)
12603 uint32_t offset = read_4_bytes (dbfd,
12604 dwp_htab->section_pool.v2.offsets
12605 + (((unit_index - 1) * dwp_htab->nr_columns
12607 * sizeof (uint32_t)));
12608 uint32_t size = read_4_bytes (dbfd,
12609 dwp_htab->section_pool.v2.sizes
12610 + (((unit_index - 1) * dwp_htab->nr_columns
12612 * sizeof (uint32_t)));
12614 switch (dwp_htab->section_pool.v2.section_ids[i])
12617 case DW_SECT_TYPES:
12618 sections.info_or_types_offset = offset;
12619 sections.info_or_types_size = size;
12621 case DW_SECT_ABBREV:
12622 sections.abbrev_offset = offset;
12623 sections.abbrev_size = size;
12626 sections.line_offset = offset;
12627 sections.line_size = size;
12630 sections.loc_offset = offset;
12631 sections.loc_size = size;
12633 case DW_SECT_STR_OFFSETS:
12634 sections.str_offsets_offset = offset;
12635 sections.str_offsets_size = size;
12637 case DW_SECT_MACINFO:
12638 sections.macinfo_offset = offset;
12639 sections.macinfo_size = size;
12641 case DW_SECT_MACRO:
12642 sections.macro_offset = offset;
12643 sections.macro_size = size;
12648 /* It's easier for the rest of the code if we fake a struct dwo_file and
12649 have dwo_unit "live" in that. At least for now.
12651 The DWP file can be made up of a random collection of CUs and TUs.
12652 However, for each CU + set of TUs that came from the same original DWO
12653 file, we can combine them back into a virtual DWO file to save space
12654 (fewer struct dwo_file objects to allocate). Remember that for really
12655 large apps there can be on the order of 8K CUs and 200K TUs, or more. */
12657 std::string virtual_dwo_name =
12658 string_printf ("virtual-dwo/%ld-%ld-%ld-%ld",
12659 (long) (sections.abbrev_size ? sections.abbrev_offset : 0),
12660 (long) (sections.line_size ? sections.line_offset : 0),
12661 (long) (sections.loc_size ? sections.loc_offset : 0),
12662 (long) (sections.str_offsets_size
12663 ? sections.str_offsets_offset : 0));
12664 /* Can we use an existing virtual DWO file? */
12665 dwo_file_slot = lookup_dwo_file_slot (dwarf2_per_objfile,
12666 virtual_dwo_name.c_str (),
12668 /* Create one if necessary. */
12669 if (*dwo_file_slot == NULL)
12671 if (dwarf_read_debug)
12673 fprintf_unfiltered (gdb_stdlog, "Creating virtual DWO: %s\n",
12674 virtual_dwo_name.c_str ());
12676 dwo_file = OBSTACK_ZALLOC (&objfile->objfile_obstack, struct dwo_file);
12678 = (const char *) obstack_copy0 (&objfile->objfile_obstack,
12679 virtual_dwo_name.c_str (),
12680 virtual_dwo_name.size ());
12681 dwo_file->comp_dir = comp_dir;
12682 dwo_file->sections.abbrev =
12683 create_dwp_v2_section (dwarf2_per_objfile, &dwp_file->sections.abbrev,
12684 sections.abbrev_offset, sections.abbrev_size);
12685 dwo_file->sections.line =
12686 create_dwp_v2_section (dwarf2_per_objfile, &dwp_file->sections.line,
12687 sections.line_offset, sections.line_size);
12688 dwo_file->sections.loc =
12689 create_dwp_v2_section (dwarf2_per_objfile, &dwp_file->sections.loc,
12690 sections.loc_offset, sections.loc_size);
12691 dwo_file->sections.macinfo =
12692 create_dwp_v2_section (dwarf2_per_objfile, &dwp_file->sections.macinfo,
12693 sections.macinfo_offset, sections.macinfo_size);
12694 dwo_file->sections.macro =
12695 create_dwp_v2_section (dwarf2_per_objfile, &dwp_file->sections.macro,
12696 sections.macro_offset, sections.macro_size);
12697 dwo_file->sections.str_offsets =
12698 create_dwp_v2_section (dwarf2_per_objfile,
12699 &dwp_file->sections.str_offsets,
12700 sections.str_offsets_offset,
12701 sections.str_offsets_size);
12702 /* The "str" section is global to the entire DWP file. */
12703 dwo_file->sections.str = dwp_file->sections.str;
12704 /* The info or types section is assigned below to dwo_unit,
12705 there's no need to record it in dwo_file.
12706 Also, we can't simply record type sections in dwo_file because
12707 we record a pointer into the vector in dwo_unit. As we collect more
12708 types we'll grow the vector and eventually have to reallocate space
12709 for it, invalidating all copies of pointers into the previous
12711 *dwo_file_slot = dwo_file;
12715 if (dwarf_read_debug)
12717 fprintf_unfiltered (gdb_stdlog, "Using existing virtual DWO: %s\n",
12718 virtual_dwo_name.c_str ());
12720 dwo_file = (struct dwo_file *) *dwo_file_slot;
12723 dwo_unit = OBSTACK_ZALLOC (&objfile->objfile_obstack, struct dwo_unit);
12724 dwo_unit->dwo_file = dwo_file;
12725 dwo_unit->signature = signature;
12726 dwo_unit->section =
12727 XOBNEW (&objfile->objfile_obstack, struct dwarf2_section_info);
12728 *dwo_unit->section = create_dwp_v2_section (dwarf2_per_objfile,
12730 ? &dwp_file->sections.types
12731 : &dwp_file->sections.info,
12732 sections.info_or_types_offset,
12733 sections.info_or_types_size);
12734 /* dwo_unit->{offset,length,type_offset_in_tu} are set later. */
12739 /* Lookup the DWO unit with SIGNATURE in DWP_FILE.
12740 Returns NULL if the signature isn't found. */
12742 static struct dwo_unit *
12743 lookup_dwo_unit_in_dwp (struct dwarf2_per_objfile *dwarf2_per_objfile,
12744 struct dwp_file *dwp_file, const char *comp_dir,
12745 ULONGEST signature, int is_debug_types)
12747 const struct dwp_hash_table *dwp_htab =
12748 is_debug_types ? dwp_file->tus : dwp_file->cus;
12749 bfd *dbfd = dwp_file->dbfd.get ();
12750 uint32_t mask = dwp_htab->nr_slots - 1;
12751 uint32_t hash = signature & mask;
12752 uint32_t hash2 = ((signature >> 32) & mask) | 1;
12755 struct dwo_unit find_dwo_cu;
12757 memset (&find_dwo_cu, 0, sizeof (find_dwo_cu));
12758 find_dwo_cu.signature = signature;
12759 slot = htab_find_slot (is_debug_types
12760 ? dwp_file->loaded_tus
12761 : dwp_file->loaded_cus,
12762 &find_dwo_cu, INSERT);
12765 return (struct dwo_unit *) *slot;
12767 /* Use a for loop so that we don't loop forever on bad debug info. */
12768 for (i = 0; i < dwp_htab->nr_slots; ++i)
12770 ULONGEST signature_in_table;
12772 signature_in_table =
12773 read_8_bytes (dbfd, dwp_htab->hash_table + hash * sizeof (uint64_t));
12774 if (signature_in_table == signature)
12776 uint32_t unit_index =
12777 read_4_bytes (dbfd,
12778 dwp_htab->unit_table + hash * sizeof (uint32_t));
12780 if (dwp_file->version == 1)
12782 *slot = create_dwo_unit_in_dwp_v1 (dwarf2_per_objfile,
12783 dwp_file, unit_index,
12784 comp_dir, signature,
12789 *slot = create_dwo_unit_in_dwp_v2 (dwarf2_per_objfile,
12790 dwp_file, unit_index,
12791 comp_dir, signature,
12794 return (struct dwo_unit *) *slot;
12796 if (signature_in_table == 0)
12798 hash = (hash + hash2) & mask;
12801 error (_("Dwarf Error: bad DWP hash table, lookup didn't terminate"
12802 " [in module %s]"),
12806 /* Subroutine of open_dwo_file,open_dwp_file to simplify them.
12807 Open the file specified by FILE_NAME and hand it off to BFD for
12808 preliminary analysis. Return a newly initialized bfd *, which
12809 includes a canonicalized copy of FILE_NAME.
12810 If IS_DWP is TRUE, we're opening a DWP file, otherwise a DWO file.
12811 SEARCH_CWD is true if the current directory is to be searched.
12812 It will be searched before debug-file-directory.
12813 If successful, the file is added to the bfd include table of the
12814 objfile's bfd (see gdb_bfd_record_inclusion).
12815 If unable to find/open the file, return NULL.
12816 NOTE: This function is derived from symfile_bfd_open. */
12818 static gdb_bfd_ref_ptr
12819 try_open_dwop_file (struct dwarf2_per_objfile *dwarf2_per_objfile,
12820 const char *file_name, int is_dwp, int search_cwd)
12823 /* Blech. OPF_TRY_CWD_FIRST also disables searching the path list if
12824 FILE_NAME contains a '/'. So we can't use it. Instead prepend "."
12825 to debug_file_directory. */
12826 const char *search_path;
12827 static const char dirname_separator_string[] = { DIRNAME_SEPARATOR, '\0' };
12829 gdb::unique_xmalloc_ptr<char> search_path_holder;
12832 if (*debug_file_directory != '\0')
12834 search_path_holder.reset (concat (".", dirname_separator_string,
12835 debug_file_directory,
12837 search_path = search_path_holder.get ();
12843 search_path = debug_file_directory;
12845 openp_flags flags = OPF_RETURN_REALPATH;
12847 flags |= OPF_SEARCH_IN_PATH;
12849 gdb::unique_xmalloc_ptr<char> absolute_name;
12850 desc = openp (search_path, flags, file_name,
12851 O_RDONLY | O_BINARY, &absolute_name);
12855 gdb_bfd_ref_ptr sym_bfd (gdb_bfd_open (absolute_name.get (),
12857 if (sym_bfd == NULL)
12859 bfd_set_cacheable (sym_bfd.get (), 1);
12861 if (!bfd_check_format (sym_bfd.get (), bfd_object))
12864 /* Success. Record the bfd as having been included by the objfile's bfd.
12865 This is important because things like demangled_names_hash lives in the
12866 objfile's per_bfd space and may have references to things like symbol
12867 names that live in the DWO/DWP file's per_bfd space. PR 16426. */
12868 gdb_bfd_record_inclusion (dwarf2_per_objfile->objfile->obfd, sym_bfd.get ());
12873 /* Try to open DWO file FILE_NAME.
12874 COMP_DIR is the DW_AT_comp_dir attribute.
12875 The result is the bfd handle of the file.
12876 If there is a problem finding or opening the file, return NULL.
12877 Upon success, the canonicalized path of the file is stored in the bfd,
12878 same as symfile_bfd_open. */
12880 static gdb_bfd_ref_ptr
12881 open_dwo_file (struct dwarf2_per_objfile *dwarf2_per_objfile,
12882 const char *file_name, const char *comp_dir)
12884 if (IS_ABSOLUTE_PATH (file_name))
12885 return try_open_dwop_file (dwarf2_per_objfile, file_name,
12886 0 /*is_dwp*/, 0 /*search_cwd*/);
12888 /* Before trying the search path, try DWO_NAME in COMP_DIR. */
12890 if (comp_dir != NULL)
12892 char *path_to_try = concat (comp_dir, SLASH_STRING,
12893 file_name, (char *) NULL);
12895 /* NOTE: If comp_dir is a relative path, this will also try the
12896 search path, which seems useful. */
12897 gdb_bfd_ref_ptr abfd (try_open_dwop_file (dwarf2_per_objfile,
12900 1 /*search_cwd*/));
12901 xfree (path_to_try);
12906 /* That didn't work, try debug-file-directory, which, despite its name,
12907 is a list of paths. */
12909 if (*debug_file_directory == '\0')
12912 return try_open_dwop_file (dwarf2_per_objfile, file_name,
12913 0 /*is_dwp*/, 1 /*search_cwd*/);
12916 /* This function is mapped across the sections and remembers the offset and
12917 size of each of the DWO debugging sections we are interested in. */
12920 dwarf2_locate_dwo_sections (bfd *abfd, asection *sectp, void *dwo_sections_ptr)
12922 struct dwo_sections *dwo_sections = (struct dwo_sections *) dwo_sections_ptr;
12923 const struct dwop_section_names *names = &dwop_section_names;
12925 if (section_is_p (sectp->name, &names->abbrev_dwo))
12927 dwo_sections->abbrev.s.section = sectp;
12928 dwo_sections->abbrev.size = bfd_get_section_size (sectp);
12930 else if (section_is_p (sectp->name, &names->info_dwo))
12932 dwo_sections->info.s.section = sectp;
12933 dwo_sections->info.size = bfd_get_section_size (sectp);
12935 else if (section_is_p (sectp->name, &names->line_dwo))
12937 dwo_sections->line.s.section = sectp;
12938 dwo_sections->line.size = bfd_get_section_size (sectp);
12940 else if (section_is_p (sectp->name, &names->loc_dwo))
12942 dwo_sections->loc.s.section = sectp;
12943 dwo_sections->loc.size = bfd_get_section_size (sectp);
12945 else if (section_is_p (sectp->name, &names->macinfo_dwo))
12947 dwo_sections->macinfo.s.section = sectp;
12948 dwo_sections->macinfo.size = bfd_get_section_size (sectp);
12950 else if (section_is_p (sectp->name, &names->macro_dwo))
12952 dwo_sections->macro.s.section = sectp;
12953 dwo_sections->macro.size = bfd_get_section_size (sectp);
12955 else if (section_is_p (sectp->name, &names->str_dwo))
12957 dwo_sections->str.s.section = sectp;
12958 dwo_sections->str.size = bfd_get_section_size (sectp);
12960 else if (section_is_p (sectp->name, &names->str_offsets_dwo))
12962 dwo_sections->str_offsets.s.section = sectp;
12963 dwo_sections->str_offsets.size = bfd_get_section_size (sectp);
12965 else if (section_is_p (sectp->name, &names->types_dwo))
12967 struct dwarf2_section_info type_section;
12969 memset (&type_section, 0, sizeof (type_section));
12970 type_section.s.section = sectp;
12971 type_section.size = bfd_get_section_size (sectp);
12972 VEC_safe_push (dwarf2_section_info_def, dwo_sections->types,
12977 /* Initialize the use of the DWO file specified by DWO_NAME and referenced
12978 by PER_CU. This is for the non-DWP case.
12979 The result is NULL if DWO_NAME can't be found. */
12981 static struct dwo_file *
12982 open_and_init_dwo_file (struct dwarf2_per_cu_data *per_cu,
12983 const char *dwo_name, const char *comp_dir)
12985 struct dwarf2_per_objfile *dwarf2_per_objfile = per_cu->dwarf2_per_objfile;
12986 struct objfile *objfile = dwarf2_per_objfile->objfile;
12988 gdb_bfd_ref_ptr dbfd (open_dwo_file (dwarf2_per_objfile, dwo_name, comp_dir));
12991 if (dwarf_read_debug)
12992 fprintf_unfiltered (gdb_stdlog, "DWO file not found: %s\n", dwo_name);
12996 /* We use a unique pointer here, despite the obstack allocation,
12997 because a dwo_file needs some cleanup if it is abandoned. */
12998 dwo_file_up dwo_file (OBSTACK_ZALLOC (&objfile->objfile_obstack,
13000 dwo_file->dwo_name = dwo_name;
13001 dwo_file->comp_dir = comp_dir;
13002 dwo_file->dbfd = dbfd.release ();
13004 bfd_map_over_sections (dwo_file->dbfd, dwarf2_locate_dwo_sections,
13005 &dwo_file->sections);
13007 create_cus_hash_table (dwarf2_per_objfile, *dwo_file, dwo_file->sections.info,
13010 create_debug_types_hash_table (dwarf2_per_objfile, dwo_file.get (),
13011 dwo_file->sections.types, dwo_file->tus);
13013 if (dwarf_read_debug)
13014 fprintf_unfiltered (gdb_stdlog, "DWO file found: %s\n", dwo_name);
13016 return dwo_file.release ();
13019 /* This function is mapped across the sections and remembers the offset and
13020 size of each of the DWP debugging sections common to version 1 and 2 that
13021 we are interested in. */
13024 dwarf2_locate_common_dwp_sections (bfd *abfd, asection *sectp,
13025 void *dwp_file_ptr)
13027 struct dwp_file *dwp_file = (struct dwp_file *) dwp_file_ptr;
13028 const struct dwop_section_names *names = &dwop_section_names;
13029 unsigned int elf_section_nr = elf_section_data (sectp)->this_idx;
13031 /* Record the ELF section number for later lookup: this is what the
13032 .debug_cu_index,.debug_tu_index tables use in DWP V1. */
13033 gdb_assert (elf_section_nr < dwp_file->num_sections);
13034 dwp_file->elf_sections[elf_section_nr] = sectp;
13036 /* Look for specific sections that we need. */
13037 if (section_is_p (sectp->name, &names->str_dwo))
13039 dwp_file->sections.str.s.section = sectp;
13040 dwp_file->sections.str.size = bfd_get_section_size (sectp);
13042 else if (section_is_p (sectp->name, &names->cu_index))
13044 dwp_file->sections.cu_index.s.section = sectp;
13045 dwp_file->sections.cu_index.size = bfd_get_section_size (sectp);
13047 else if (section_is_p (sectp->name, &names->tu_index))
13049 dwp_file->sections.tu_index.s.section = sectp;
13050 dwp_file->sections.tu_index.size = bfd_get_section_size (sectp);
13054 /* This function is mapped across the sections and remembers the offset and
13055 size of each of the DWP version 2 debugging sections that we are interested
13056 in. This is split into a separate function because we don't know if we
13057 have version 1 or 2 until we parse the cu_index/tu_index sections. */
13060 dwarf2_locate_v2_dwp_sections (bfd *abfd, asection *sectp, void *dwp_file_ptr)
13062 struct dwp_file *dwp_file = (struct dwp_file *) dwp_file_ptr;
13063 const struct dwop_section_names *names = &dwop_section_names;
13064 unsigned int elf_section_nr = elf_section_data (sectp)->this_idx;
13066 /* Record the ELF section number for later lookup: this is what the
13067 .debug_cu_index,.debug_tu_index tables use in DWP V1. */
13068 gdb_assert (elf_section_nr < dwp_file->num_sections);
13069 dwp_file->elf_sections[elf_section_nr] = sectp;
13071 /* Look for specific sections that we need. */
13072 if (section_is_p (sectp->name, &names->abbrev_dwo))
13074 dwp_file->sections.abbrev.s.section = sectp;
13075 dwp_file->sections.abbrev.size = bfd_get_section_size (sectp);
13077 else if (section_is_p (sectp->name, &names->info_dwo))
13079 dwp_file->sections.info.s.section = sectp;
13080 dwp_file->sections.info.size = bfd_get_section_size (sectp);
13082 else if (section_is_p (sectp->name, &names->line_dwo))
13084 dwp_file->sections.line.s.section = sectp;
13085 dwp_file->sections.line.size = bfd_get_section_size (sectp);
13087 else if (section_is_p (sectp->name, &names->loc_dwo))
13089 dwp_file->sections.loc.s.section = sectp;
13090 dwp_file->sections.loc.size = bfd_get_section_size (sectp);
13092 else if (section_is_p (sectp->name, &names->macinfo_dwo))
13094 dwp_file->sections.macinfo.s.section = sectp;
13095 dwp_file->sections.macinfo.size = bfd_get_section_size (sectp);
13097 else if (section_is_p (sectp->name, &names->macro_dwo))
13099 dwp_file->sections.macro.s.section = sectp;
13100 dwp_file->sections.macro.size = bfd_get_section_size (sectp);
13102 else if (section_is_p (sectp->name, &names->str_offsets_dwo))
13104 dwp_file->sections.str_offsets.s.section = sectp;
13105 dwp_file->sections.str_offsets.size = bfd_get_section_size (sectp);
13107 else if (section_is_p (sectp->name, &names->types_dwo))
13109 dwp_file->sections.types.s.section = sectp;
13110 dwp_file->sections.types.size = bfd_get_section_size (sectp);
13114 /* Hash function for dwp_file loaded CUs/TUs. */
13117 hash_dwp_loaded_cutus (const void *item)
13119 const struct dwo_unit *dwo_unit = (const struct dwo_unit *) item;
13121 /* This drops the top 32 bits of the signature, but is ok for a hash. */
13122 return dwo_unit->signature;
13125 /* Equality function for dwp_file loaded CUs/TUs. */
13128 eq_dwp_loaded_cutus (const void *a, const void *b)
13130 const struct dwo_unit *dua = (const struct dwo_unit *) a;
13131 const struct dwo_unit *dub = (const struct dwo_unit *) b;
13133 return dua->signature == dub->signature;
13136 /* Allocate a hash table for dwp_file loaded CUs/TUs. */
13139 allocate_dwp_loaded_cutus_table (struct objfile *objfile)
13141 return htab_create_alloc_ex (3,
13142 hash_dwp_loaded_cutus,
13143 eq_dwp_loaded_cutus,
13145 &objfile->objfile_obstack,
13146 hashtab_obstack_allocate,
13147 dummy_obstack_deallocate);
13150 /* Try to open DWP file FILE_NAME.
13151 The result is the bfd handle of the file.
13152 If there is a problem finding or opening the file, return NULL.
13153 Upon success, the canonicalized path of the file is stored in the bfd,
13154 same as symfile_bfd_open. */
13156 static gdb_bfd_ref_ptr
13157 open_dwp_file (struct dwarf2_per_objfile *dwarf2_per_objfile,
13158 const char *file_name)
13160 gdb_bfd_ref_ptr abfd (try_open_dwop_file (dwarf2_per_objfile, file_name,
13162 1 /*search_cwd*/));
13166 /* Work around upstream bug 15652.
13167 http://sourceware.org/bugzilla/show_bug.cgi?id=15652
13168 [Whether that's a "bug" is debatable, but it is getting in our way.]
13169 We have no real idea where the dwp file is, because gdb's realpath-ing
13170 of the executable's path may have discarded the needed info.
13171 [IWBN if the dwp file name was recorded in the executable, akin to
13172 .gnu_debuglink, but that doesn't exist yet.]
13173 Strip the directory from FILE_NAME and search again. */
13174 if (*debug_file_directory != '\0')
13176 /* Don't implicitly search the current directory here.
13177 If the user wants to search "." to handle this case,
13178 it must be added to debug-file-directory. */
13179 return try_open_dwop_file (dwarf2_per_objfile,
13180 lbasename (file_name), 1 /*is_dwp*/,
13187 /* Initialize the use of the DWP file for the current objfile.
13188 By convention the name of the DWP file is ${objfile}.dwp.
13189 The result is NULL if it can't be found. */
13191 static std::unique_ptr<struct dwp_file>
13192 open_and_init_dwp_file (struct dwarf2_per_objfile *dwarf2_per_objfile)
13194 struct objfile *objfile = dwarf2_per_objfile->objfile;
13196 /* Try to find first .dwp for the binary file before any symbolic links
13199 /* If the objfile is a debug file, find the name of the real binary
13200 file and get the name of dwp file from there. */
13201 std::string dwp_name;
13202 if (objfile->separate_debug_objfile_backlink != NULL)
13204 struct objfile *backlink = objfile->separate_debug_objfile_backlink;
13205 const char *backlink_basename = lbasename (backlink->original_name);
13207 dwp_name = ldirname (objfile->original_name) + SLASH_STRING + backlink_basename;
13210 dwp_name = objfile->original_name;
13212 dwp_name += ".dwp";
13214 gdb_bfd_ref_ptr dbfd (open_dwp_file (dwarf2_per_objfile, dwp_name.c_str ()));
13216 && strcmp (objfile->original_name, objfile_name (objfile)) != 0)
13218 /* Try to find .dwp for the binary file after gdb_realpath resolving. */
13219 dwp_name = objfile_name (objfile);
13220 dwp_name += ".dwp";
13221 dbfd = open_dwp_file (dwarf2_per_objfile, dwp_name.c_str ());
13226 if (dwarf_read_debug)
13227 fprintf_unfiltered (gdb_stdlog, "DWP file not found: %s\n", dwp_name.c_str ());
13228 return std::unique_ptr<dwp_file> ();
13231 const char *name = bfd_get_filename (dbfd.get ());
13232 std::unique_ptr<struct dwp_file> dwp_file
13233 (new struct dwp_file (name, std::move (dbfd)));
13235 dwp_file->num_sections = elf_numsections (dwp_file->dbfd);
13236 dwp_file->elf_sections =
13237 OBSTACK_CALLOC (&objfile->objfile_obstack,
13238 dwp_file->num_sections, asection *);
13240 bfd_map_over_sections (dwp_file->dbfd.get (),
13241 dwarf2_locate_common_dwp_sections,
13244 dwp_file->cus = create_dwp_hash_table (dwarf2_per_objfile, dwp_file.get (),
13247 dwp_file->tus = create_dwp_hash_table (dwarf2_per_objfile, dwp_file.get (),
13250 /* The DWP file version is stored in the hash table. Oh well. */
13251 if (dwp_file->cus && dwp_file->tus
13252 && dwp_file->cus->version != dwp_file->tus->version)
13254 /* Technically speaking, we should try to limp along, but this is
13255 pretty bizarre. We use pulongest here because that's the established
13256 portability solution (e.g, we cannot use %u for uint32_t). */
13257 error (_("Dwarf Error: DWP file CU version %s doesn't match"
13258 " TU version %s [in DWP file %s]"),
13259 pulongest (dwp_file->cus->version),
13260 pulongest (dwp_file->tus->version), dwp_name.c_str ());
13264 dwp_file->version = dwp_file->cus->version;
13265 else if (dwp_file->tus)
13266 dwp_file->version = dwp_file->tus->version;
13268 dwp_file->version = 2;
13270 if (dwp_file->version == 2)
13271 bfd_map_over_sections (dwp_file->dbfd.get (),
13272 dwarf2_locate_v2_dwp_sections,
13275 dwp_file->loaded_cus = allocate_dwp_loaded_cutus_table (objfile);
13276 dwp_file->loaded_tus = allocate_dwp_loaded_cutus_table (objfile);
13278 if (dwarf_read_debug)
13280 fprintf_unfiltered (gdb_stdlog, "DWP file found: %s\n", dwp_file->name);
13281 fprintf_unfiltered (gdb_stdlog,
13282 " %s CUs, %s TUs\n",
13283 pulongest (dwp_file->cus ? dwp_file->cus->nr_units : 0),
13284 pulongest (dwp_file->tus ? dwp_file->tus->nr_units : 0));
13290 /* Wrapper around open_and_init_dwp_file, only open it once. */
13292 static struct dwp_file *
13293 get_dwp_file (struct dwarf2_per_objfile *dwarf2_per_objfile)
13295 if (! dwarf2_per_objfile->dwp_checked)
13297 dwarf2_per_objfile->dwp_file
13298 = open_and_init_dwp_file (dwarf2_per_objfile);
13299 dwarf2_per_objfile->dwp_checked = 1;
13301 return dwarf2_per_objfile->dwp_file.get ();
13304 /* Subroutine of lookup_dwo_comp_unit, lookup_dwo_type_unit.
13305 Look up the CU/TU with signature SIGNATURE, either in DWO file DWO_NAME
13306 or in the DWP file for the objfile, referenced by THIS_UNIT.
13307 If non-NULL, comp_dir is the DW_AT_comp_dir attribute.
13308 IS_DEBUG_TYPES is non-zero if reading a TU, otherwise read a CU.
13310 This is called, for example, when wanting to read a variable with a
13311 complex location. Therefore we don't want to do file i/o for every call.
13312 Therefore we don't want to look for a DWO file on every call.
13313 Therefore we first see if we've already seen SIGNATURE in a DWP file,
13314 then we check if we've already seen DWO_NAME, and only THEN do we check
13317 The result is a pointer to the dwo_unit object or NULL if we didn't find it
13318 (dwo_id mismatch or couldn't find the DWO/DWP file). */
13320 static struct dwo_unit *
13321 lookup_dwo_cutu (struct dwarf2_per_cu_data *this_unit,
13322 const char *dwo_name, const char *comp_dir,
13323 ULONGEST signature, int is_debug_types)
13325 struct dwarf2_per_objfile *dwarf2_per_objfile = this_unit->dwarf2_per_objfile;
13326 struct objfile *objfile = dwarf2_per_objfile->objfile;
13327 const char *kind = is_debug_types ? "TU" : "CU";
13328 void **dwo_file_slot;
13329 struct dwo_file *dwo_file;
13330 struct dwp_file *dwp_file;
13332 /* First see if there's a DWP file.
13333 If we have a DWP file but didn't find the DWO inside it, don't
13334 look for the original DWO file. It makes gdb behave differently
13335 depending on whether one is debugging in the build tree. */
13337 dwp_file = get_dwp_file (dwarf2_per_objfile);
13338 if (dwp_file != NULL)
13340 const struct dwp_hash_table *dwp_htab =
13341 is_debug_types ? dwp_file->tus : dwp_file->cus;
13343 if (dwp_htab != NULL)
13345 struct dwo_unit *dwo_cutu =
13346 lookup_dwo_unit_in_dwp (dwarf2_per_objfile, dwp_file, comp_dir,
13347 signature, is_debug_types);
13349 if (dwo_cutu != NULL)
13351 if (dwarf_read_debug)
13353 fprintf_unfiltered (gdb_stdlog,
13354 "Virtual DWO %s %s found: @%s\n",
13355 kind, hex_string (signature),
13356 host_address_to_string (dwo_cutu));
13364 /* No DWP file, look for the DWO file. */
13366 dwo_file_slot = lookup_dwo_file_slot (dwarf2_per_objfile,
13367 dwo_name, comp_dir);
13368 if (*dwo_file_slot == NULL)
13370 /* Read in the file and build a table of the CUs/TUs it contains. */
13371 *dwo_file_slot = open_and_init_dwo_file (this_unit, dwo_name, comp_dir);
13373 /* NOTE: This will be NULL if unable to open the file. */
13374 dwo_file = (struct dwo_file *) *dwo_file_slot;
13376 if (dwo_file != NULL)
13378 struct dwo_unit *dwo_cutu = NULL;
13380 if (is_debug_types && dwo_file->tus)
13382 struct dwo_unit find_dwo_cutu;
13384 memset (&find_dwo_cutu, 0, sizeof (find_dwo_cutu));
13385 find_dwo_cutu.signature = signature;
13387 = (struct dwo_unit *) htab_find (dwo_file->tus, &find_dwo_cutu);
13389 else if (!is_debug_types && dwo_file->cus)
13391 struct dwo_unit find_dwo_cutu;
13393 memset (&find_dwo_cutu, 0, sizeof (find_dwo_cutu));
13394 find_dwo_cutu.signature = signature;
13395 dwo_cutu = (struct dwo_unit *)htab_find (dwo_file->cus,
13399 if (dwo_cutu != NULL)
13401 if (dwarf_read_debug)
13403 fprintf_unfiltered (gdb_stdlog, "DWO %s %s(%s) found: @%s\n",
13404 kind, dwo_name, hex_string (signature),
13405 host_address_to_string (dwo_cutu));
13412 /* We didn't find it. This could mean a dwo_id mismatch, or
13413 someone deleted the DWO/DWP file, or the search path isn't set up
13414 correctly to find the file. */
13416 if (dwarf_read_debug)
13418 fprintf_unfiltered (gdb_stdlog, "DWO %s %s(%s) not found\n",
13419 kind, dwo_name, hex_string (signature));
13422 /* This is a warning and not a complaint because it can be caused by
13423 pilot error (e.g., user accidentally deleting the DWO). */
13425 /* Print the name of the DWP file if we looked there, helps the user
13426 better diagnose the problem. */
13427 std::string dwp_text;
13429 if (dwp_file != NULL)
13430 dwp_text = string_printf (" [in DWP file %s]",
13431 lbasename (dwp_file->name));
13433 warning (_("Could not find DWO %s %s(%s)%s referenced by %s at offset %s"
13434 " [in module %s]"),
13435 kind, dwo_name, hex_string (signature),
13437 this_unit->is_debug_types ? "TU" : "CU",
13438 sect_offset_str (this_unit->sect_off), objfile_name (objfile));
13443 /* Lookup the DWO CU DWO_NAME/SIGNATURE referenced from THIS_CU.
13444 See lookup_dwo_cutu_unit for details. */
13446 static struct dwo_unit *
13447 lookup_dwo_comp_unit (struct dwarf2_per_cu_data *this_cu,
13448 const char *dwo_name, const char *comp_dir,
13449 ULONGEST signature)
13451 return lookup_dwo_cutu (this_cu, dwo_name, comp_dir, signature, 0);
13454 /* Lookup the DWO TU DWO_NAME/SIGNATURE referenced from THIS_TU.
13455 See lookup_dwo_cutu_unit for details. */
13457 static struct dwo_unit *
13458 lookup_dwo_type_unit (struct signatured_type *this_tu,
13459 const char *dwo_name, const char *comp_dir)
13461 return lookup_dwo_cutu (&this_tu->per_cu, dwo_name, comp_dir, this_tu->signature, 1);
13464 /* Traversal function for queue_and_load_all_dwo_tus. */
13467 queue_and_load_dwo_tu (void **slot, void *info)
13469 struct dwo_unit *dwo_unit = (struct dwo_unit *) *slot;
13470 struct dwarf2_per_cu_data *per_cu = (struct dwarf2_per_cu_data *) info;
13471 ULONGEST signature = dwo_unit->signature;
13472 struct signatured_type *sig_type =
13473 lookup_dwo_signatured_type (per_cu->cu, signature);
13475 if (sig_type != NULL)
13477 struct dwarf2_per_cu_data *sig_cu = &sig_type->per_cu;
13479 /* We pass NULL for DEPENDENT_CU because we don't yet know if there's
13480 a real dependency of PER_CU on SIG_TYPE. That is detected later
13481 while processing PER_CU. */
13482 if (maybe_queue_comp_unit (NULL, sig_cu, per_cu->cu->language))
13483 load_full_type_unit (sig_cu);
13484 VEC_safe_push (dwarf2_per_cu_ptr, per_cu->imported_symtabs, sig_cu);
13490 /* Queue all TUs contained in the DWO of PER_CU to be read in.
13491 The DWO may have the only definition of the type, though it may not be
13492 referenced anywhere in PER_CU. Thus we have to load *all* its TUs.
13493 http://sourceware.org/bugzilla/show_bug.cgi?id=15021 */
13496 queue_and_load_all_dwo_tus (struct dwarf2_per_cu_data *per_cu)
13498 struct dwo_unit *dwo_unit;
13499 struct dwo_file *dwo_file;
13501 gdb_assert (!per_cu->is_debug_types);
13502 gdb_assert (get_dwp_file (per_cu->dwarf2_per_objfile) == NULL);
13503 gdb_assert (per_cu->cu != NULL);
13505 dwo_unit = per_cu->cu->dwo_unit;
13506 gdb_assert (dwo_unit != NULL);
13508 dwo_file = dwo_unit->dwo_file;
13509 if (dwo_file->tus != NULL)
13510 htab_traverse_noresize (dwo_file->tus, queue_and_load_dwo_tu, per_cu);
13513 /* Free all resources associated with DWO_FILE.
13514 Close the DWO file and munmap the sections. */
13517 free_dwo_file (struct dwo_file *dwo_file)
13519 /* Note: dbfd is NULL for virtual DWO files. */
13520 gdb_bfd_unref (dwo_file->dbfd);
13522 VEC_free (dwarf2_section_info_def, dwo_file->sections.types);
13525 /* Traversal function for free_dwo_files. */
13528 free_dwo_file_from_slot (void **slot, void *info)
13530 struct dwo_file *dwo_file = (struct dwo_file *) *slot;
13532 free_dwo_file (dwo_file);
13537 /* Free all resources associated with DWO_FILES. */
13540 free_dwo_files (htab_t dwo_files, struct objfile *objfile)
13542 htab_traverse_noresize (dwo_files, free_dwo_file_from_slot, objfile);
13545 /* Read in various DIEs. */
13547 /* DW_AT_abstract_origin inherits whole DIEs (not just their attributes).
13548 Inherit only the children of the DW_AT_abstract_origin DIE not being
13549 already referenced by DW_AT_abstract_origin from the children of the
13553 inherit_abstract_dies (struct die_info *die, struct dwarf2_cu *cu)
13555 struct die_info *child_die;
13556 sect_offset *offsetp;
13557 /* Parent of DIE - referenced by DW_AT_abstract_origin. */
13558 struct die_info *origin_die;
13559 /* Iterator of the ORIGIN_DIE children. */
13560 struct die_info *origin_child_die;
13561 struct attribute *attr;
13562 struct dwarf2_cu *origin_cu;
13563 struct pending **origin_previous_list_in_scope;
13565 attr = dwarf2_attr (die, DW_AT_abstract_origin, cu);
13569 /* Note that following die references may follow to a die in a
13573 origin_die = follow_die_ref (die, attr, &origin_cu);
13575 /* We're inheriting ORIGIN's children into the scope we'd put DIE's
13577 origin_previous_list_in_scope = origin_cu->list_in_scope;
13578 origin_cu->list_in_scope = cu->list_in_scope;
13580 if (die->tag != origin_die->tag
13581 && !(die->tag == DW_TAG_inlined_subroutine
13582 && origin_die->tag == DW_TAG_subprogram))
13583 complaint (_("DIE %s and its abstract origin %s have different tags"),
13584 sect_offset_str (die->sect_off),
13585 sect_offset_str (origin_die->sect_off));
13587 std::vector<sect_offset> offsets;
13589 for (child_die = die->child;
13590 child_die && child_die->tag;
13591 child_die = sibling_die (child_die))
13593 struct die_info *child_origin_die;
13594 struct dwarf2_cu *child_origin_cu;
13596 /* We are trying to process concrete instance entries:
13597 DW_TAG_call_site DIEs indeed have a DW_AT_abstract_origin tag, but
13598 it's not relevant to our analysis here. i.e. detecting DIEs that are
13599 present in the abstract instance but not referenced in the concrete
13601 if (child_die->tag == DW_TAG_call_site
13602 || child_die->tag == DW_TAG_GNU_call_site)
13605 /* For each CHILD_DIE, find the corresponding child of
13606 ORIGIN_DIE. If there is more than one layer of
13607 DW_AT_abstract_origin, follow them all; there shouldn't be,
13608 but GCC versions at least through 4.4 generate this (GCC PR
13610 child_origin_die = child_die;
13611 child_origin_cu = cu;
13614 attr = dwarf2_attr (child_origin_die, DW_AT_abstract_origin,
13618 child_origin_die = follow_die_ref (child_origin_die, attr,
13622 /* According to DWARF3 3.3.8.2 #3 new entries without their abstract
13623 counterpart may exist. */
13624 if (child_origin_die != child_die)
13626 if (child_die->tag != child_origin_die->tag
13627 && !(child_die->tag == DW_TAG_inlined_subroutine
13628 && child_origin_die->tag == DW_TAG_subprogram))
13629 complaint (_("Child DIE %s and its abstract origin %s have "
13631 sect_offset_str (child_die->sect_off),
13632 sect_offset_str (child_origin_die->sect_off));
13633 if (child_origin_die->parent != origin_die)
13634 complaint (_("Child DIE %s and its abstract origin %s have "
13635 "different parents"),
13636 sect_offset_str (child_die->sect_off),
13637 sect_offset_str (child_origin_die->sect_off));
13639 offsets.push_back (child_origin_die->sect_off);
13642 std::sort (offsets.begin (), offsets.end ());
13643 sect_offset *offsets_end = offsets.data () + offsets.size ();
13644 for (offsetp = offsets.data () + 1; offsetp < offsets_end; offsetp++)
13645 if (offsetp[-1] == *offsetp)
13646 complaint (_("Multiple children of DIE %s refer "
13647 "to DIE %s as their abstract origin"),
13648 sect_offset_str (die->sect_off), sect_offset_str (*offsetp));
13650 offsetp = offsets.data ();
13651 origin_child_die = origin_die->child;
13652 while (origin_child_die && origin_child_die->tag)
13654 /* Is ORIGIN_CHILD_DIE referenced by any of the DIE children? */
13655 while (offsetp < offsets_end
13656 && *offsetp < origin_child_die->sect_off)
13658 if (offsetp >= offsets_end
13659 || *offsetp > origin_child_die->sect_off)
13661 /* Found that ORIGIN_CHILD_DIE is really not referenced.
13662 Check whether we're already processing ORIGIN_CHILD_DIE.
13663 This can happen with mutually referenced abstract_origins.
13665 if (!origin_child_die->in_process)
13666 process_die (origin_child_die, origin_cu);
13668 origin_child_die = sibling_die (origin_child_die);
13670 origin_cu->list_in_scope = origin_previous_list_in_scope;
13674 read_func_scope (struct die_info *die, struct dwarf2_cu *cu)
13676 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
13677 struct gdbarch *gdbarch = get_objfile_arch (objfile);
13678 struct context_stack *newobj;
13681 struct die_info *child_die;
13682 struct attribute *attr, *call_line, *call_file;
13684 CORE_ADDR baseaddr;
13685 struct block *block;
13686 int inlined_func = (die->tag == DW_TAG_inlined_subroutine);
13687 std::vector<struct symbol *> template_args;
13688 struct template_symbol *templ_func = NULL;
13692 /* If we do not have call site information, we can't show the
13693 caller of this inlined function. That's too confusing, so
13694 only use the scope for local variables. */
13695 call_line = dwarf2_attr (die, DW_AT_call_line, cu);
13696 call_file = dwarf2_attr (die, DW_AT_call_file, cu);
13697 if (call_line == NULL || call_file == NULL)
13699 read_lexical_block_scope (die, cu);
13704 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
13706 name = dwarf2_name (die, cu);
13708 /* Ignore functions with missing or empty names. These are actually
13709 illegal according to the DWARF standard. */
13712 complaint (_("missing name for subprogram DIE at %s"),
13713 sect_offset_str (die->sect_off));
13717 /* Ignore functions with missing or invalid low and high pc attributes. */
13718 if (dwarf2_get_pc_bounds (die, &lowpc, &highpc, cu, NULL)
13719 <= PC_BOUNDS_INVALID)
13721 attr = dwarf2_attr (die, DW_AT_external, cu);
13722 if (!attr || !DW_UNSND (attr))
13723 complaint (_("cannot get low and high bounds "
13724 "for subprogram DIE at %s"),
13725 sect_offset_str (die->sect_off));
13729 lowpc = gdbarch_adjust_dwarf2_addr (gdbarch, lowpc + baseaddr);
13730 highpc = gdbarch_adjust_dwarf2_addr (gdbarch, highpc + baseaddr);
13732 /* If we have any template arguments, then we must allocate a
13733 different sort of symbol. */
13734 for (child_die = die->child; child_die; child_die = sibling_die (child_die))
13736 if (child_die->tag == DW_TAG_template_type_param
13737 || child_die->tag == DW_TAG_template_value_param)
13739 templ_func = allocate_template_symbol (objfile);
13740 templ_func->subclass = SYMBOL_TEMPLATE;
13745 newobj = cu->get_builder ()->push_context (0, lowpc);
13746 newobj->name = new_symbol (die, read_type_die (die, cu), cu,
13747 (struct symbol *) templ_func);
13749 /* If there is a location expression for DW_AT_frame_base, record
13751 attr = dwarf2_attr (die, DW_AT_frame_base, cu);
13753 dwarf2_symbol_mark_computed (attr, newobj->name, cu, 1);
13755 /* If there is a location for the static link, record it. */
13756 newobj->static_link = NULL;
13757 attr = dwarf2_attr (die, DW_AT_static_link, cu);
13760 newobj->static_link
13761 = XOBNEW (&objfile->objfile_obstack, struct dynamic_prop);
13762 attr_to_dynamic_prop (attr, die, cu, newobj->static_link);
13765 cu->list_in_scope = cu->get_builder ()->get_local_symbols ();
13767 if (die->child != NULL)
13769 child_die = die->child;
13770 while (child_die && child_die->tag)
13772 if (child_die->tag == DW_TAG_template_type_param
13773 || child_die->tag == DW_TAG_template_value_param)
13775 struct symbol *arg = new_symbol (child_die, NULL, cu);
13778 template_args.push_back (arg);
13781 process_die (child_die, cu);
13782 child_die = sibling_die (child_die);
13786 inherit_abstract_dies (die, cu);
13788 /* If we have a DW_AT_specification, we might need to import using
13789 directives from the context of the specification DIE. See the
13790 comment in determine_prefix. */
13791 if (cu->language == language_cplus
13792 && dwarf2_attr (die, DW_AT_specification, cu))
13794 struct dwarf2_cu *spec_cu = cu;
13795 struct die_info *spec_die = die_specification (die, &spec_cu);
13799 child_die = spec_die->child;
13800 while (child_die && child_die->tag)
13802 if (child_die->tag == DW_TAG_imported_module)
13803 process_die (child_die, spec_cu);
13804 child_die = sibling_die (child_die);
13807 /* In some cases, GCC generates specification DIEs that
13808 themselves contain DW_AT_specification attributes. */
13809 spec_die = die_specification (spec_die, &spec_cu);
13813 struct context_stack cstk = cu->get_builder ()->pop_context ();
13814 /* Make a block for the local symbols within. */
13815 block = cu->get_builder ()->finish_block (cstk.name, cstk.old_blocks,
13816 cstk.static_link, lowpc, highpc);
13818 /* For C++, set the block's scope. */
13819 if ((cu->language == language_cplus
13820 || cu->language == language_fortran
13821 || cu->language == language_d
13822 || cu->language == language_rust)
13823 && cu->processing_has_namespace_info)
13824 block_set_scope (block, determine_prefix (die, cu),
13825 &objfile->objfile_obstack);
13827 /* If we have address ranges, record them. */
13828 dwarf2_record_block_ranges (die, block, baseaddr, cu);
13830 gdbarch_make_symbol_special (gdbarch, cstk.name, objfile);
13832 /* Attach template arguments to function. */
13833 if (!template_args.empty ())
13835 gdb_assert (templ_func != NULL);
13837 templ_func->n_template_arguments = template_args.size ();
13838 templ_func->template_arguments
13839 = XOBNEWVEC (&objfile->objfile_obstack, struct symbol *,
13840 templ_func->n_template_arguments);
13841 memcpy (templ_func->template_arguments,
13842 template_args.data (),
13843 (templ_func->n_template_arguments * sizeof (struct symbol *)));
13845 /* Make sure that the symtab is set on the new symbols. Even
13846 though they don't appear in this symtab directly, other parts
13847 of gdb assume that symbols do, and this is reasonably
13849 for (symbol *sym : template_args)
13850 symbol_set_symtab (sym, symbol_symtab (templ_func));
13853 /* In C++, we can have functions nested inside functions (e.g., when
13854 a function declares a class that has methods). This means that
13855 when we finish processing a function scope, we may need to go
13856 back to building a containing block's symbol lists. */
13857 *cu->get_builder ()->get_local_symbols () = cstk.locals;
13858 cu->get_builder ()->set_local_using_directives (cstk.local_using_directives);
13860 /* If we've finished processing a top-level function, subsequent
13861 symbols go in the file symbol list. */
13862 if (cu->get_builder ()->outermost_context_p ())
13863 cu->list_in_scope = cu->get_builder ()->get_file_symbols ();
13866 /* Process all the DIES contained within a lexical block scope. Start
13867 a new scope, process the dies, and then close the scope. */
13870 read_lexical_block_scope (struct die_info *die, struct dwarf2_cu *cu)
13872 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
13873 struct gdbarch *gdbarch = get_objfile_arch (objfile);
13874 CORE_ADDR lowpc, highpc;
13875 struct die_info *child_die;
13876 CORE_ADDR baseaddr;
13878 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
13880 /* Ignore blocks with missing or invalid low and high pc attributes. */
13881 /* ??? Perhaps consider discontiguous blocks defined by DW_AT_ranges
13882 as multiple lexical blocks? Handling children in a sane way would
13883 be nasty. Might be easier to properly extend generic blocks to
13884 describe ranges. */
13885 switch (dwarf2_get_pc_bounds (die, &lowpc, &highpc, cu, NULL))
13887 case PC_BOUNDS_NOT_PRESENT:
13888 /* DW_TAG_lexical_block has no attributes, process its children as if
13889 there was no wrapping by that DW_TAG_lexical_block.
13890 GCC does no longer produces such DWARF since GCC r224161. */
13891 for (child_die = die->child;
13892 child_die != NULL && child_die->tag;
13893 child_die = sibling_die (child_die))
13894 process_die (child_die, cu);
13896 case PC_BOUNDS_INVALID:
13899 lowpc = gdbarch_adjust_dwarf2_addr (gdbarch, lowpc + baseaddr);
13900 highpc = gdbarch_adjust_dwarf2_addr (gdbarch, highpc + baseaddr);
13902 cu->get_builder ()->push_context (0, lowpc);
13903 if (die->child != NULL)
13905 child_die = die->child;
13906 while (child_die && child_die->tag)
13908 process_die (child_die, cu);
13909 child_die = sibling_die (child_die);
13912 inherit_abstract_dies (die, cu);
13913 struct context_stack cstk = cu->get_builder ()->pop_context ();
13915 if (*cu->get_builder ()->get_local_symbols () != NULL
13916 || (*cu->get_builder ()->get_local_using_directives ()) != NULL)
13918 struct block *block
13919 = cu->get_builder ()->finish_block (0, cstk.old_blocks, NULL,
13920 cstk.start_addr, highpc);
13922 /* Note that recording ranges after traversing children, as we
13923 do here, means that recording a parent's ranges entails
13924 walking across all its children's ranges as they appear in
13925 the address map, which is quadratic behavior.
13927 It would be nicer to record the parent's ranges before
13928 traversing its children, simply overriding whatever you find
13929 there. But since we don't even decide whether to create a
13930 block until after we've traversed its children, that's hard
13932 dwarf2_record_block_ranges (die, block, baseaddr, cu);
13934 *cu->get_builder ()->get_local_symbols () = cstk.locals;
13935 cu->get_builder ()->set_local_using_directives (cstk.local_using_directives);
13938 /* Read in DW_TAG_call_site and insert it to CU->call_site_htab. */
13941 read_call_site_scope (struct die_info *die, struct dwarf2_cu *cu)
13943 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
13944 struct gdbarch *gdbarch = get_objfile_arch (objfile);
13945 CORE_ADDR pc, baseaddr;
13946 struct attribute *attr;
13947 struct call_site *call_site, call_site_local;
13950 struct die_info *child_die;
13952 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
13954 attr = dwarf2_attr (die, DW_AT_call_return_pc, cu);
13957 /* This was a pre-DWARF-5 GNU extension alias
13958 for DW_AT_call_return_pc. */
13959 attr = dwarf2_attr (die, DW_AT_low_pc, cu);
13963 complaint (_("missing DW_AT_call_return_pc for DW_TAG_call_site "
13964 "DIE %s [in module %s]"),
13965 sect_offset_str (die->sect_off), objfile_name (objfile));
13968 pc = attr_value_as_address (attr) + baseaddr;
13969 pc = gdbarch_adjust_dwarf2_addr (gdbarch, pc);
13971 if (cu->call_site_htab == NULL)
13972 cu->call_site_htab = htab_create_alloc_ex (16, core_addr_hash, core_addr_eq,
13973 NULL, &objfile->objfile_obstack,
13974 hashtab_obstack_allocate, NULL);
13975 call_site_local.pc = pc;
13976 slot = htab_find_slot (cu->call_site_htab, &call_site_local, INSERT);
13979 complaint (_("Duplicate PC %s for DW_TAG_call_site "
13980 "DIE %s [in module %s]"),
13981 paddress (gdbarch, pc), sect_offset_str (die->sect_off),
13982 objfile_name (objfile));
13986 /* Count parameters at the caller. */
13989 for (child_die = die->child; child_die && child_die->tag;
13990 child_die = sibling_die (child_die))
13992 if (child_die->tag != DW_TAG_call_site_parameter
13993 && child_die->tag != DW_TAG_GNU_call_site_parameter)
13995 complaint (_("Tag %d is not DW_TAG_call_site_parameter in "
13996 "DW_TAG_call_site child DIE %s [in module %s]"),
13997 child_die->tag, sect_offset_str (child_die->sect_off),
13998 objfile_name (objfile));
14006 = ((struct call_site *)
14007 obstack_alloc (&objfile->objfile_obstack,
14008 sizeof (*call_site)
14009 + (sizeof (*call_site->parameter) * (nparams - 1))));
14011 memset (call_site, 0, sizeof (*call_site) - sizeof (*call_site->parameter));
14012 call_site->pc = pc;
14014 if (dwarf2_flag_true_p (die, DW_AT_call_tail_call, cu)
14015 || dwarf2_flag_true_p (die, DW_AT_GNU_tail_call, cu))
14017 struct die_info *func_die;
14019 /* Skip also over DW_TAG_inlined_subroutine. */
14020 for (func_die = die->parent;
14021 func_die && func_die->tag != DW_TAG_subprogram
14022 && func_die->tag != DW_TAG_subroutine_type;
14023 func_die = func_die->parent);
14025 /* DW_AT_call_all_calls is a superset
14026 of DW_AT_call_all_tail_calls. */
14028 && !dwarf2_flag_true_p (func_die, DW_AT_call_all_calls, cu)
14029 && !dwarf2_flag_true_p (func_die, DW_AT_GNU_all_call_sites, cu)
14030 && !dwarf2_flag_true_p (func_die, DW_AT_call_all_tail_calls, cu)
14031 && !dwarf2_flag_true_p (func_die, DW_AT_GNU_all_tail_call_sites, cu))
14033 /* TYPE_TAIL_CALL_LIST is not interesting in functions where it is
14034 not complete. But keep CALL_SITE for look ups via call_site_htab,
14035 both the initial caller containing the real return address PC and
14036 the final callee containing the current PC of a chain of tail
14037 calls do not need to have the tail call list complete. But any
14038 function candidate for a virtual tail call frame searched via
14039 TYPE_TAIL_CALL_LIST must have the tail call list complete to be
14040 determined unambiguously. */
14044 struct type *func_type = NULL;
14047 func_type = get_die_type (func_die, cu);
14048 if (func_type != NULL)
14050 gdb_assert (TYPE_CODE (func_type) == TYPE_CODE_FUNC);
14052 /* Enlist this call site to the function. */
14053 call_site->tail_call_next = TYPE_TAIL_CALL_LIST (func_type);
14054 TYPE_TAIL_CALL_LIST (func_type) = call_site;
14057 complaint (_("Cannot find function owning DW_TAG_call_site "
14058 "DIE %s [in module %s]"),
14059 sect_offset_str (die->sect_off), objfile_name (objfile));
14063 attr = dwarf2_attr (die, DW_AT_call_target, cu);
14065 attr = dwarf2_attr (die, DW_AT_GNU_call_site_target, cu);
14067 attr = dwarf2_attr (die, DW_AT_call_origin, cu);
14070 /* This was a pre-DWARF-5 GNU extension alias for DW_AT_call_origin. */
14071 attr = dwarf2_attr (die, DW_AT_abstract_origin, cu);
14073 SET_FIELD_DWARF_BLOCK (call_site->target, NULL);
14074 if (!attr || (attr_form_is_block (attr) && DW_BLOCK (attr)->size == 0))
14075 /* Keep NULL DWARF_BLOCK. */;
14076 else if (attr_form_is_block (attr))
14078 struct dwarf2_locexpr_baton *dlbaton;
14080 dlbaton = XOBNEW (&objfile->objfile_obstack, struct dwarf2_locexpr_baton);
14081 dlbaton->data = DW_BLOCK (attr)->data;
14082 dlbaton->size = DW_BLOCK (attr)->size;
14083 dlbaton->per_cu = cu->per_cu;
14085 SET_FIELD_DWARF_BLOCK (call_site->target, dlbaton);
14087 else if (attr_form_is_ref (attr))
14089 struct dwarf2_cu *target_cu = cu;
14090 struct die_info *target_die;
14092 target_die = follow_die_ref (die, attr, &target_cu);
14093 gdb_assert (target_cu->per_cu->dwarf2_per_objfile->objfile == objfile);
14094 if (die_is_declaration (target_die, target_cu))
14096 const char *target_physname;
14098 /* Prefer the mangled name; otherwise compute the demangled one. */
14099 target_physname = dw2_linkage_name (target_die, target_cu);
14100 if (target_physname == NULL)
14101 target_physname = dwarf2_physname (NULL, target_die, target_cu);
14102 if (target_physname == NULL)
14103 complaint (_("DW_AT_call_target target DIE has invalid "
14104 "physname, for referencing DIE %s [in module %s]"),
14105 sect_offset_str (die->sect_off), objfile_name (objfile));
14107 SET_FIELD_PHYSNAME (call_site->target, target_physname);
14113 /* DW_AT_entry_pc should be preferred. */
14114 if (dwarf2_get_pc_bounds (target_die, &lowpc, NULL, target_cu, NULL)
14115 <= PC_BOUNDS_INVALID)
14116 complaint (_("DW_AT_call_target target DIE has invalid "
14117 "low pc, for referencing DIE %s [in module %s]"),
14118 sect_offset_str (die->sect_off), objfile_name (objfile));
14121 lowpc = gdbarch_adjust_dwarf2_addr (gdbarch, lowpc + baseaddr);
14122 SET_FIELD_PHYSADDR (call_site->target, lowpc);
14127 complaint (_("DW_TAG_call_site DW_AT_call_target is neither "
14128 "block nor reference, for DIE %s [in module %s]"),
14129 sect_offset_str (die->sect_off), objfile_name (objfile));
14131 call_site->per_cu = cu->per_cu;
14133 for (child_die = die->child;
14134 child_die && child_die->tag;
14135 child_die = sibling_die (child_die))
14137 struct call_site_parameter *parameter;
14138 struct attribute *loc, *origin;
14140 if (child_die->tag != DW_TAG_call_site_parameter
14141 && child_die->tag != DW_TAG_GNU_call_site_parameter)
14143 /* Already printed the complaint above. */
14147 gdb_assert (call_site->parameter_count < nparams);
14148 parameter = &call_site->parameter[call_site->parameter_count];
14150 /* DW_AT_location specifies the register number or DW_AT_abstract_origin
14151 specifies DW_TAG_formal_parameter. Value of the data assumed for the
14152 register is contained in DW_AT_call_value. */
14154 loc = dwarf2_attr (child_die, DW_AT_location, cu);
14155 origin = dwarf2_attr (child_die, DW_AT_call_parameter, cu);
14156 if (origin == NULL)
14158 /* This was a pre-DWARF-5 GNU extension alias
14159 for DW_AT_call_parameter. */
14160 origin = dwarf2_attr (child_die, DW_AT_abstract_origin, cu);
14162 if (loc == NULL && origin != NULL && attr_form_is_ref (origin))
14164 parameter->kind = CALL_SITE_PARAMETER_PARAM_OFFSET;
14166 sect_offset sect_off
14167 = (sect_offset) dwarf2_get_ref_die_offset (origin);
14168 if (!offset_in_cu_p (&cu->header, sect_off))
14170 /* As DW_OP_GNU_parameter_ref uses CU-relative offset this
14171 binding can be done only inside one CU. Such referenced DIE
14172 therefore cannot be even moved to DW_TAG_partial_unit. */
14173 complaint (_("DW_AT_call_parameter offset is not in CU for "
14174 "DW_TAG_call_site child DIE %s [in module %s]"),
14175 sect_offset_str (child_die->sect_off),
14176 objfile_name (objfile));
14179 parameter->u.param_cu_off
14180 = (cu_offset) (sect_off - cu->header.sect_off);
14182 else if (loc == NULL || origin != NULL || !attr_form_is_block (loc))
14184 complaint (_("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 (_("Only single DW_OP_reg or DW_OP_fbreg is supported "
14202 "for DW_FORM_block* DW_AT_location is supported for "
14203 "DW_TAG_call_site child DIE %s "
14205 sect_offset_str (child_die->sect_off),
14206 objfile_name (objfile));
14211 attr = dwarf2_attr (child_die, DW_AT_call_value, cu);
14213 attr = dwarf2_attr (child_die, DW_AT_GNU_call_site_value, cu);
14214 if (!attr_form_is_block (attr))
14216 complaint (_("No DW_FORM_block* DW_AT_call_value for "
14217 "DW_TAG_call_site child DIE %s [in module %s]"),
14218 sect_offset_str (child_die->sect_off),
14219 objfile_name (objfile));
14222 parameter->value = DW_BLOCK (attr)->data;
14223 parameter->value_size = DW_BLOCK (attr)->size;
14225 /* Parameters are not pre-cleared by memset above. */
14226 parameter->data_value = NULL;
14227 parameter->data_value_size = 0;
14228 call_site->parameter_count++;
14230 attr = dwarf2_attr (child_die, DW_AT_call_data_value, cu);
14232 attr = dwarf2_attr (child_die, DW_AT_GNU_call_site_data_value, cu);
14235 if (!attr_form_is_block (attr))
14236 complaint (_("No DW_FORM_block* DW_AT_call_data_value for "
14237 "DW_TAG_call_site child DIE %s [in module %s]"),
14238 sect_offset_str (child_die->sect_off),
14239 objfile_name (objfile));
14242 parameter->data_value = DW_BLOCK (attr)->data;
14243 parameter->data_value_size = DW_BLOCK (attr)->size;
14249 /* Helper function for read_variable. If DIE represents a virtual
14250 table, then return the type of the concrete object that is
14251 associated with the virtual table. Otherwise, return NULL. */
14253 static struct type *
14254 rust_containing_type (struct die_info *die, struct dwarf2_cu *cu)
14256 struct attribute *attr = dwarf2_attr (die, DW_AT_type, cu);
14260 /* Find the type DIE. */
14261 struct die_info *type_die = NULL;
14262 struct dwarf2_cu *type_cu = cu;
14264 if (attr_form_is_ref (attr))
14265 type_die = follow_die_ref (die, attr, &type_cu);
14266 if (type_die == NULL)
14269 if (dwarf2_attr (type_die, DW_AT_containing_type, type_cu) == NULL)
14271 return die_containing_type (type_die, type_cu);
14274 /* Read a variable (DW_TAG_variable) DIE and create a new symbol. */
14277 read_variable (struct die_info *die, struct dwarf2_cu *cu)
14279 struct rust_vtable_symbol *storage = NULL;
14281 if (cu->language == language_rust)
14283 struct type *containing_type = rust_containing_type (die, cu);
14285 if (containing_type != NULL)
14287 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
14289 storage = OBSTACK_ZALLOC (&objfile->objfile_obstack,
14290 struct rust_vtable_symbol);
14291 initialize_objfile_symbol (storage);
14292 storage->concrete_type = containing_type;
14293 storage->subclass = SYMBOL_RUST_VTABLE;
14297 struct symbol *res = new_symbol (die, NULL, cu, storage);
14298 struct attribute *abstract_origin
14299 = dwarf2_attr (die, DW_AT_abstract_origin, cu);
14300 struct attribute *loc = dwarf2_attr (die, DW_AT_location, cu);
14301 if (res == NULL && loc && abstract_origin)
14303 /* We have a variable without a name, but with a location and an abstract
14304 origin. This may be a concrete instance of an abstract variable
14305 referenced from an DW_OP_GNU_variable_value, so save it to find it back
14307 struct dwarf2_cu *origin_cu = cu;
14308 struct die_info *origin_die
14309 = follow_die_ref (die, abstract_origin, &origin_cu);
14310 dwarf2_per_objfile *dpo = cu->per_cu->dwarf2_per_objfile;
14311 dpo->abstract_to_concrete[origin_die].push_back (die);
14315 /* Call CALLBACK from DW_AT_ranges attribute value OFFSET
14316 reading .debug_rnglists.
14317 Callback's type should be:
14318 void (CORE_ADDR range_beginning, CORE_ADDR range_end)
14319 Return true if the attributes are present and valid, otherwise,
14322 template <typename Callback>
14324 dwarf2_rnglists_process (unsigned offset, struct dwarf2_cu *cu,
14325 Callback &&callback)
14327 struct dwarf2_per_objfile *dwarf2_per_objfile
14328 = cu->per_cu->dwarf2_per_objfile;
14329 struct objfile *objfile = dwarf2_per_objfile->objfile;
14330 bfd *obfd = objfile->obfd;
14331 /* Base address selection entry. */
14334 const gdb_byte *buffer;
14335 CORE_ADDR baseaddr;
14336 bool overflow = false;
14338 found_base = cu->base_known;
14339 base = cu->base_address;
14341 dwarf2_read_section (objfile, &dwarf2_per_objfile->rnglists);
14342 if (offset >= dwarf2_per_objfile->rnglists.size)
14344 complaint (_("Offset %d out of bounds for DW_AT_ranges attribute"),
14348 buffer = dwarf2_per_objfile->rnglists.buffer + offset;
14350 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
14354 /* Initialize it due to a false compiler warning. */
14355 CORE_ADDR range_beginning = 0, range_end = 0;
14356 const gdb_byte *buf_end = (dwarf2_per_objfile->rnglists.buffer
14357 + dwarf2_per_objfile->rnglists.size);
14358 unsigned int bytes_read;
14360 if (buffer == buf_end)
14365 const auto rlet = static_cast<enum dwarf_range_list_entry>(*buffer++);
14368 case DW_RLE_end_of_list:
14370 case DW_RLE_base_address:
14371 if (buffer + cu->header.addr_size > buf_end)
14376 base = read_address (obfd, buffer, cu, &bytes_read);
14378 buffer += bytes_read;
14380 case DW_RLE_start_length:
14381 if (buffer + cu->header.addr_size > buf_end)
14386 range_beginning = read_address (obfd, buffer, cu, &bytes_read);
14387 buffer += bytes_read;
14388 range_end = (range_beginning
14389 + read_unsigned_leb128 (obfd, buffer, &bytes_read));
14390 buffer += bytes_read;
14391 if (buffer > buf_end)
14397 case DW_RLE_offset_pair:
14398 range_beginning = read_unsigned_leb128 (obfd, buffer, &bytes_read);
14399 buffer += bytes_read;
14400 if (buffer > buf_end)
14405 range_end = read_unsigned_leb128 (obfd, buffer, &bytes_read);
14406 buffer += bytes_read;
14407 if (buffer > buf_end)
14413 case DW_RLE_start_end:
14414 if (buffer + 2 * cu->header.addr_size > buf_end)
14419 range_beginning = read_address (obfd, buffer, cu, &bytes_read);
14420 buffer += bytes_read;
14421 range_end = read_address (obfd, buffer, cu, &bytes_read);
14422 buffer += bytes_read;
14425 complaint (_("Invalid .debug_rnglists data (no base address)"));
14428 if (rlet == DW_RLE_end_of_list || overflow)
14430 if (rlet == DW_RLE_base_address)
14435 /* We have no valid base address for the ranges
14437 complaint (_("Invalid .debug_rnglists data (no base address)"));
14441 if (range_beginning > range_end)
14443 /* Inverted range entries are invalid. */
14444 complaint (_("Invalid .debug_rnglists data (inverted range)"));
14448 /* Empty range entries have no effect. */
14449 if (range_beginning == range_end)
14452 range_beginning += base;
14455 /* A not-uncommon case of bad debug info.
14456 Don't pollute the addrmap with bad data. */
14457 if (range_beginning + baseaddr == 0
14458 && !dwarf2_per_objfile->has_section_at_zero)
14460 complaint (_(".debug_rnglists entry has start address of zero"
14461 " [in module %s]"), objfile_name (objfile));
14465 callback (range_beginning, range_end);
14470 complaint (_("Offset %d is not terminated "
14471 "for DW_AT_ranges attribute"),
14479 /* Call CALLBACK from DW_AT_ranges attribute value OFFSET reading .debug_ranges.
14480 Callback's type should be:
14481 void (CORE_ADDR range_beginning, CORE_ADDR range_end)
14482 Return 1 if the attributes are present and valid, otherwise, return 0. */
14484 template <typename Callback>
14486 dwarf2_ranges_process (unsigned offset, struct dwarf2_cu *cu,
14487 Callback &&callback)
14489 struct dwarf2_per_objfile *dwarf2_per_objfile
14490 = cu->per_cu->dwarf2_per_objfile;
14491 struct objfile *objfile = dwarf2_per_objfile->objfile;
14492 struct comp_unit_head *cu_header = &cu->header;
14493 bfd *obfd = objfile->obfd;
14494 unsigned int addr_size = cu_header->addr_size;
14495 CORE_ADDR mask = ~(~(CORE_ADDR)1 << (addr_size * 8 - 1));
14496 /* Base address selection entry. */
14499 unsigned int dummy;
14500 const gdb_byte *buffer;
14501 CORE_ADDR baseaddr;
14503 if (cu_header->version >= 5)
14504 return dwarf2_rnglists_process (offset, cu, callback);
14506 found_base = cu->base_known;
14507 base = cu->base_address;
14509 dwarf2_read_section (objfile, &dwarf2_per_objfile->ranges);
14510 if (offset >= dwarf2_per_objfile->ranges.size)
14512 complaint (_("Offset %d out of bounds for DW_AT_ranges attribute"),
14516 buffer = dwarf2_per_objfile->ranges.buffer + offset;
14518 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
14522 CORE_ADDR range_beginning, range_end;
14524 range_beginning = read_address (obfd, buffer, cu, &dummy);
14525 buffer += addr_size;
14526 range_end = read_address (obfd, buffer, cu, &dummy);
14527 buffer += addr_size;
14528 offset += 2 * addr_size;
14530 /* An end of list marker is a pair of zero addresses. */
14531 if (range_beginning == 0 && range_end == 0)
14532 /* Found the end of list entry. */
14535 /* Each base address selection entry is a pair of 2 values.
14536 The first is the largest possible address, the second is
14537 the base address. Check for a base address here. */
14538 if ((range_beginning & mask) == mask)
14540 /* If we found the largest possible address, then we already
14541 have the base address in range_end. */
14549 /* We have no valid base address for the ranges
14551 complaint (_("Invalid .debug_ranges data (no base address)"));
14555 if (range_beginning > range_end)
14557 /* Inverted range entries are invalid. */
14558 complaint (_("Invalid .debug_ranges data (inverted range)"));
14562 /* Empty range entries have no effect. */
14563 if (range_beginning == range_end)
14566 range_beginning += base;
14569 /* A not-uncommon case of bad debug info.
14570 Don't pollute the addrmap with bad data. */
14571 if (range_beginning + baseaddr == 0
14572 && !dwarf2_per_objfile->has_section_at_zero)
14574 complaint (_(".debug_ranges entry has start address of zero"
14575 " [in module %s]"), objfile_name (objfile));
14579 callback (range_beginning, range_end);
14585 /* Get low and high pc attributes from DW_AT_ranges attribute value OFFSET.
14586 Return 1 if the attributes are present and valid, otherwise, return 0.
14587 If RANGES_PST is not NULL we should setup `objfile->psymtabs_addrmap'. */
14590 dwarf2_ranges_read (unsigned offset, CORE_ADDR *low_return,
14591 CORE_ADDR *high_return, struct dwarf2_cu *cu,
14592 struct partial_symtab *ranges_pst)
14594 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
14595 struct gdbarch *gdbarch = get_objfile_arch (objfile);
14596 const CORE_ADDR baseaddr = ANOFFSET (objfile->section_offsets,
14597 SECT_OFF_TEXT (objfile));
14600 CORE_ADDR high = 0;
14603 retval = dwarf2_ranges_process (offset, cu,
14604 [&] (CORE_ADDR range_beginning, CORE_ADDR range_end)
14606 if (ranges_pst != NULL)
14611 lowpc = (gdbarch_adjust_dwarf2_addr (gdbarch,
14612 range_beginning + baseaddr)
14614 highpc = (gdbarch_adjust_dwarf2_addr (gdbarch,
14615 range_end + baseaddr)
14617 addrmap_set_empty (objfile->partial_symtabs->psymtabs_addrmap,
14618 lowpc, highpc - 1, ranges_pst);
14621 /* FIXME: This is recording everything as a low-high
14622 segment of consecutive addresses. We should have a
14623 data structure for discontiguous block ranges
14627 low = range_beginning;
14633 if (range_beginning < low)
14634 low = range_beginning;
14635 if (range_end > high)
14643 /* If the first entry is an end-of-list marker, the range
14644 describes an empty scope, i.e. no instructions. */
14650 *high_return = high;
14654 /* Get low and high pc attributes from a die. See enum pc_bounds_kind
14655 definition for the return value. *LOWPC and *HIGHPC are set iff
14656 neither PC_BOUNDS_NOT_PRESENT nor PC_BOUNDS_INVALID are returned. */
14658 static enum pc_bounds_kind
14659 dwarf2_get_pc_bounds (struct die_info *die, CORE_ADDR *lowpc,
14660 CORE_ADDR *highpc, struct dwarf2_cu *cu,
14661 struct partial_symtab *pst)
14663 struct dwarf2_per_objfile *dwarf2_per_objfile
14664 = cu->per_cu->dwarf2_per_objfile;
14665 struct attribute *attr;
14666 struct attribute *attr_high;
14668 CORE_ADDR high = 0;
14669 enum pc_bounds_kind ret;
14671 attr_high = dwarf2_attr (die, DW_AT_high_pc, cu);
14674 attr = dwarf2_attr (die, DW_AT_low_pc, cu);
14677 low = attr_value_as_address (attr);
14678 high = attr_value_as_address (attr_high);
14679 if (cu->header.version >= 4 && attr_form_is_constant (attr_high))
14683 /* Found high w/o low attribute. */
14684 return PC_BOUNDS_INVALID;
14686 /* Found consecutive range of addresses. */
14687 ret = PC_BOUNDS_HIGH_LOW;
14691 attr = dwarf2_attr (die, DW_AT_ranges, cu);
14694 /* DW_AT_ranges_base does not apply to DIEs from the DWO skeleton.
14695 We take advantage of the fact that DW_AT_ranges does not appear
14696 in DW_TAG_compile_unit of DWO files. */
14697 int need_ranges_base = die->tag != DW_TAG_compile_unit;
14698 unsigned int ranges_offset = (DW_UNSND (attr)
14699 + (need_ranges_base
14703 /* Value of the DW_AT_ranges attribute is the offset in the
14704 .debug_ranges section. */
14705 if (!dwarf2_ranges_read (ranges_offset, &low, &high, cu, pst))
14706 return PC_BOUNDS_INVALID;
14707 /* Found discontinuous range of addresses. */
14708 ret = PC_BOUNDS_RANGES;
14711 return PC_BOUNDS_NOT_PRESENT;
14714 /* partial_die_info::read has also the strict LOW < HIGH requirement. */
14716 return PC_BOUNDS_INVALID;
14718 /* When using the GNU linker, .gnu.linkonce. sections are used to
14719 eliminate duplicate copies of functions and vtables and such.
14720 The linker will arbitrarily choose one and discard the others.
14721 The AT_*_pc values for such functions refer to local labels in
14722 these sections. If the section from that file was discarded, the
14723 labels are not in the output, so the relocs get a value of 0.
14724 If this is a discarded function, mark the pc bounds as invalid,
14725 so that GDB will ignore it. */
14726 if (low == 0 && !dwarf2_per_objfile->has_section_at_zero)
14727 return PC_BOUNDS_INVALID;
14735 /* Assuming that DIE represents a subprogram DIE or a lexical block, get
14736 its low and high PC addresses. Do nothing if these addresses could not
14737 be determined. Otherwise, set LOWPC to the low address if it is smaller,
14738 and HIGHPC to the high address if greater than HIGHPC. */
14741 dwarf2_get_subprogram_pc_bounds (struct die_info *die,
14742 CORE_ADDR *lowpc, CORE_ADDR *highpc,
14743 struct dwarf2_cu *cu)
14745 CORE_ADDR low, high;
14746 struct die_info *child = die->child;
14748 if (dwarf2_get_pc_bounds (die, &low, &high, cu, NULL) >= PC_BOUNDS_RANGES)
14750 *lowpc = std::min (*lowpc, low);
14751 *highpc = std::max (*highpc, high);
14754 /* If the language does not allow nested subprograms (either inside
14755 subprograms or lexical blocks), we're done. */
14756 if (cu->language != language_ada)
14759 /* Check all the children of the given DIE. If it contains nested
14760 subprograms, then check their pc bounds. Likewise, we need to
14761 check lexical blocks as well, as they may also contain subprogram
14763 while (child && child->tag)
14765 if (child->tag == DW_TAG_subprogram
14766 || child->tag == DW_TAG_lexical_block)
14767 dwarf2_get_subprogram_pc_bounds (child, lowpc, highpc, cu);
14768 child = sibling_die (child);
14772 /* Get the low and high pc's represented by the scope DIE, and store
14773 them in *LOWPC and *HIGHPC. If the correct values can't be
14774 determined, set *LOWPC to -1 and *HIGHPC to 0. */
14777 get_scope_pc_bounds (struct die_info *die,
14778 CORE_ADDR *lowpc, CORE_ADDR *highpc,
14779 struct dwarf2_cu *cu)
14781 CORE_ADDR best_low = (CORE_ADDR) -1;
14782 CORE_ADDR best_high = (CORE_ADDR) 0;
14783 CORE_ADDR current_low, current_high;
14785 if (dwarf2_get_pc_bounds (die, ¤t_low, ¤t_high, cu, NULL)
14786 >= PC_BOUNDS_RANGES)
14788 best_low = current_low;
14789 best_high = current_high;
14793 struct die_info *child = die->child;
14795 while (child && child->tag)
14797 switch (child->tag) {
14798 case DW_TAG_subprogram:
14799 dwarf2_get_subprogram_pc_bounds (child, &best_low, &best_high, cu);
14801 case DW_TAG_namespace:
14802 case DW_TAG_module:
14803 /* FIXME: carlton/2004-01-16: Should we do this for
14804 DW_TAG_class_type/DW_TAG_structure_type, too? I think
14805 that current GCC's always emit the DIEs corresponding
14806 to definitions of methods of classes as children of a
14807 DW_TAG_compile_unit or DW_TAG_namespace (as opposed to
14808 the DIEs giving the declarations, which could be
14809 anywhere). But I don't see any reason why the
14810 standards says that they have to be there. */
14811 get_scope_pc_bounds (child, ¤t_low, ¤t_high, cu);
14813 if (current_low != ((CORE_ADDR) -1))
14815 best_low = std::min (best_low, current_low);
14816 best_high = std::max (best_high, current_high);
14824 child = sibling_die (child);
14829 *highpc = best_high;
14832 /* Record the address ranges for BLOCK, offset by BASEADDR, as given
14836 dwarf2_record_block_ranges (struct die_info *die, struct block *block,
14837 CORE_ADDR baseaddr, struct dwarf2_cu *cu)
14839 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
14840 struct gdbarch *gdbarch = get_objfile_arch (objfile);
14841 struct attribute *attr;
14842 struct attribute *attr_high;
14844 attr_high = dwarf2_attr (die, DW_AT_high_pc, cu);
14847 attr = dwarf2_attr (die, DW_AT_low_pc, cu);
14850 CORE_ADDR low = attr_value_as_address (attr);
14851 CORE_ADDR high = attr_value_as_address (attr_high);
14853 if (cu->header.version >= 4 && attr_form_is_constant (attr_high))
14856 low = gdbarch_adjust_dwarf2_addr (gdbarch, low + baseaddr);
14857 high = gdbarch_adjust_dwarf2_addr (gdbarch, high + baseaddr);
14858 cu->get_builder ()->record_block_range (block, low, high - 1);
14862 attr = dwarf2_attr (die, DW_AT_ranges, cu);
14865 /* DW_AT_ranges_base does not apply to DIEs from the DWO skeleton.
14866 We take advantage of the fact that DW_AT_ranges does not appear
14867 in DW_TAG_compile_unit of DWO files. */
14868 int need_ranges_base = die->tag != DW_TAG_compile_unit;
14870 /* The value of the DW_AT_ranges attribute is the offset of the
14871 address range list in the .debug_ranges section. */
14872 unsigned long offset = (DW_UNSND (attr)
14873 + (need_ranges_base ? cu->ranges_base : 0));
14875 std::vector<blockrange> blockvec;
14876 dwarf2_ranges_process (offset, cu,
14877 [&] (CORE_ADDR start, CORE_ADDR end)
14881 start = gdbarch_adjust_dwarf2_addr (gdbarch, start);
14882 end = gdbarch_adjust_dwarf2_addr (gdbarch, end);
14883 cu->get_builder ()->record_block_range (block, start, end - 1);
14884 blockvec.emplace_back (start, end);
14887 BLOCK_RANGES(block) = make_blockranges (objfile, blockvec);
14891 /* Check whether the producer field indicates either of GCC < 4.6, or the
14892 Intel C/C++ compiler, and cache the result in CU. */
14895 check_producer (struct dwarf2_cu *cu)
14899 if (cu->producer == NULL)
14901 /* For unknown compilers expect their behavior is DWARF version
14904 GCC started to support .debug_types sections by -gdwarf-4 since
14905 gcc-4.5.x. As the .debug_types sections are missing DW_AT_producer
14906 for their space efficiency GDB cannot workaround gcc-4.5.x -gdwarf-4
14907 combination. gcc-4.5.x -gdwarf-4 binaries have DW_AT_accessibility
14908 interpreted incorrectly by GDB now - GCC PR debug/48229. */
14910 else if (producer_is_gcc (cu->producer, &major, &minor))
14912 cu->producer_is_gxx_lt_4_6 = major < 4 || (major == 4 && minor < 6);
14913 cu->producer_is_gcc_lt_4_3 = major < 4 || (major == 4 && minor < 3);
14915 else if (producer_is_icc (cu->producer, &major, &minor))
14917 cu->producer_is_icc = true;
14918 cu->producer_is_icc_lt_14 = major < 14;
14920 else if (startswith (cu->producer, "CodeWarrior S12/L-ISA"))
14921 cu->producer_is_codewarrior = true;
14924 /* For other non-GCC compilers, expect their behavior is DWARF version
14928 cu->checked_producer = true;
14931 /* Check for GCC PR debug/45124 fix which is not present in any G++ version up
14932 to 4.5.any while it is present already in G++ 4.6.0 - the PR has been fixed
14933 during 4.6.0 experimental. */
14936 producer_is_gxx_lt_4_6 (struct dwarf2_cu *cu)
14938 if (!cu->checked_producer)
14939 check_producer (cu);
14941 return cu->producer_is_gxx_lt_4_6;
14945 /* Codewarrior (at least as of version 5.0.40) generates dwarf line information
14946 with incorrect is_stmt attributes. */
14949 producer_is_codewarrior (struct dwarf2_cu *cu)
14951 if (!cu->checked_producer)
14952 check_producer (cu);
14954 return cu->producer_is_codewarrior;
14957 /* Return the default accessibility type if it is not overriden by
14958 DW_AT_accessibility. */
14960 static enum dwarf_access_attribute
14961 dwarf2_default_access_attribute (struct die_info *die, struct dwarf2_cu *cu)
14963 if (cu->header.version < 3 || producer_is_gxx_lt_4_6 (cu))
14965 /* The default DWARF 2 accessibility for members is public, the default
14966 accessibility for inheritance is private. */
14968 if (die->tag != DW_TAG_inheritance)
14969 return DW_ACCESS_public;
14971 return DW_ACCESS_private;
14975 /* DWARF 3+ defines the default accessibility a different way. The same
14976 rules apply now for DW_TAG_inheritance as for the members and it only
14977 depends on the container kind. */
14979 if (die->parent->tag == DW_TAG_class_type)
14980 return DW_ACCESS_private;
14982 return DW_ACCESS_public;
14986 /* Look for DW_AT_data_member_location. Set *OFFSET to the byte
14987 offset. If the attribute was not found return 0, otherwise return
14988 1. If it was found but could not properly be handled, set *OFFSET
14992 handle_data_member_location (struct die_info *die, struct dwarf2_cu *cu,
14995 struct attribute *attr;
14997 attr = dwarf2_attr (die, DW_AT_data_member_location, cu);
15002 /* Note that we do not check for a section offset first here.
15003 This is because DW_AT_data_member_location is new in DWARF 4,
15004 so if we see it, we can assume that a constant form is really
15005 a constant and not a section offset. */
15006 if (attr_form_is_constant (attr))
15007 *offset = dwarf2_get_attr_constant_value (attr, 0);
15008 else if (attr_form_is_section_offset (attr))
15009 dwarf2_complex_location_expr_complaint ();
15010 else if (attr_form_is_block (attr))
15011 *offset = decode_locdesc (DW_BLOCK (attr), cu);
15013 dwarf2_complex_location_expr_complaint ();
15021 /* Add an aggregate field to the field list. */
15024 dwarf2_add_field (struct field_info *fip, struct die_info *die,
15025 struct dwarf2_cu *cu)
15027 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
15028 struct gdbarch *gdbarch = get_objfile_arch (objfile);
15029 struct nextfield *new_field;
15030 struct attribute *attr;
15032 const char *fieldname = "";
15034 if (die->tag == DW_TAG_inheritance)
15036 fip->baseclasses.emplace_back ();
15037 new_field = &fip->baseclasses.back ();
15041 fip->fields.emplace_back ();
15042 new_field = &fip->fields.back ();
15047 attr = dwarf2_attr (die, DW_AT_accessibility, cu);
15049 new_field->accessibility = DW_UNSND (attr);
15051 new_field->accessibility = dwarf2_default_access_attribute (die, cu);
15052 if (new_field->accessibility != DW_ACCESS_public)
15053 fip->non_public_fields = 1;
15055 attr = dwarf2_attr (die, DW_AT_virtuality, cu);
15057 new_field->virtuality = DW_UNSND (attr);
15059 new_field->virtuality = DW_VIRTUALITY_none;
15061 fp = &new_field->field;
15063 if (die->tag == DW_TAG_member && ! die_is_declaration (die, cu))
15067 /* Data member other than a C++ static data member. */
15069 /* Get type of field. */
15070 fp->type = die_type (die, cu);
15072 SET_FIELD_BITPOS (*fp, 0);
15074 /* Get bit size of field (zero if none). */
15075 attr = dwarf2_attr (die, DW_AT_bit_size, cu);
15078 FIELD_BITSIZE (*fp) = DW_UNSND (attr);
15082 FIELD_BITSIZE (*fp) = 0;
15085 /* Get bit offset of field. */
15086 if (handle_data_member_location (die, cu, &offset))
15087 SET_FIELD_BITPOS (*fp, offset * bits_per_byte);
15088 attr = dwarf2_attr (die, DW_AT_bit_offset, cu);
15091 if (gdbarch_bits_big_endian (gdbarch))
15093 /* For big endian bits, the DW_AT_bit_offset gives the
15094 additional bit offset from the MSB of the containing
15095 anonymous object to the MSB of the field. We don't
15096 have to do anything special since we don't need to
15097 know the size of the anonymous object. */
15098 SET_FIELD_BITPOS (*fp, FIELD_BITPOS (*fp) + DW_UNSND (attr));
15102 /* For little endian bits, compute the bit offset to the
15103 MSB of the anonymous object, subtract off the number of
15104 bits from the MSB of the field to the MSB of the
15105 object, and then subtract off the number of bits of
15106 the field itself. The result is the bit offset of
15107 the LSB of the field. */
15108 int anonymous_size;
15109 int bit_offset = DW_UNSND (attr);
15111 attr = dwarf2_attr (die, DW_AT_byte_size, cu);
15114 /* The size of the anonymous object containing
15115 the bit field is explicit, so use the
15116 indicated size (in bytes). */
15117 anonymous_size = DW_UNSND (attr);
15121 /* The size of the anonymous object containing
15122 the bit field must be inferred from the type
15123 attribute of the data member containing the
15125 anonymous_size = TYPE_LENGTH (fp->type);
15127 SET_FIELD_BITPOS (*fp,
15128 (FIELD_BITPOS (*fp)
15129 + anonymous_size * bits_per_byte
15130 - bit_offset - FIELD_BITSIZE (*fp)));
15133 attr = dwarf2_attr (die, DW_AT_data_bit_offset, cu);
15135 SET_FIELD_BITPOS (*fp, (FIELD_BITPOS (*fp)
15136 + dwarf2_get_attr_constant_value (attr, 0)));
15138 /* Get name of field. */
15139 fieldname = dwarf2_name (die, cu);
15140 if (fieldname == NULL)
15143 /* The name is already allocated along with this objfile, so we don't
15144 need to duplicate it for the type. */
15145 fp->name = fieldname;
15147 /* Change accessibility for artificial fields (e.g. virtual table
15148 pointer or virtual base class pointer) to private. */
15149 if (dwarf2_attr (die, DW_AT_artificial, cu))
15151 FIELD_ARTIFICIAL (*fp) = 1;
15152 new_field->accessibility = DW_ACCESS_private;
15153 fip->non_public_fields = 1;
15156 else if (die->tag == DW_TAG_member || die->tag == DW_TAG_variable)
15158 /* C++ static member. */
15160 /* NOTE: carlton/2002-11-05: It should be a DW_TAG_member that
15161 is a declaration, but all versions of G++ as of this writing
15162 (so through at least 3.2.1) incorrectly generate
15163 DW_TAG_variable tags. */
15165 const char *physname;
15167 /* Get name of field. */
15168 fieldname = dwarf2_name (die, cu);
15169 if (fieldname == NULL)
15172 attr = dwarf2_attr (die, DW_AT_const_value, cu);
15174 /* Only create a symbol if this is an external value.
15175 new_symbol checks this and puts the value in the global symbol
15176 table, which we want. If it is not external, new_symbol
15177 will try to put the value in cu->list_in_scope which is wrong. */
15178 && dwarf2_flag_true_p (die, DW_AT_external, cu))
15180 /* A static const member, not much different than an enum as far as
15181 we're concerned, except that we can support more types. */
15182 new_symbol (die, NULL, cu);
15185 /* Get physical name. */
15186 physname = dwarf2_physname (fieldname, die, cu);
15188 /* The name is already allocated along with this objfile, so we don't
15189 need to duplicate it for the type. */
15190 SET_FIELD_PHYSNAME (*fp, physname ? physname : "");
15191 FIELD_TYPE (*fp) = die_type (die, cu);
15192 FIELD_NAME (*fp) = fieldname;
15194 else if (die->tag == DW_TAG_inheritance)
15198 /* C++ base class field. */
15199 if (handle_data_member_location (die, cu, &offset))
15200 SET_FIELD_BITPOS (*fp, offset * bits_per_byte);
15201 FIELD_BITSIZE (*fp) = 0;
15202 FIELD_TYPE (*fp) = die_type (die, cu);
15203 FIELD_NAME (*fp) = TYPE_NAME (fp->type);
15205 else if (die->tag == DW_TAG_variant_part)
15207 /* process_structure_scope will treat this DIE as a union. */
15208 process_structure_scope (die, cu);
15210 /* The variant part is relative to the start of the enclosing
15212 SET_FIELD_BITPOS (*fp, 0);
15213 fp->type = get_die_type (die, cu);
15214 fp->artificial = 1;
15215 fp->name = "<<variant>>";
15217 /* Normally a DW_TAG_variant_part won't have a size, but our
15218 representation requires one, so set it to the maximum of the
15220 if (TYPE_LENGTH (fp->type) == 0)
15223 for (int i = 0; i < TYPE_NFIELDS (fp->type); ++i)
15224 if (TYPE_LENGTH (TYPE_FIELD_TYPE (fp->type, i)) > max)
15225 max = TYPE_LENGTH (TYPE_FIELD_TYPE (fp->type, i));
15226 TYPE_LENGTH (fp->type) = max;
15230 gdb_assert_not_reached ("missing case in dwarf2_add_field");
15233 /* Can the type given by DIE define another type? */
15236 type_can_define_types (const struct die_info *die)
15240 case DW_TAG_typedef:
15241 case DW_TAG_class_type:
15242 case DW_TAG_structure_type:
15243 case DW_TAG_union_type:
15244 case DW_TAG_enumeration_type:
15252 /* Add a type definition defined in the scope of the FIP's class. */
15255 dwarf2_add_type_defn (struct field_info *fip, struct die_info *die,
15256 struct dwarf2_cu *cu)
15258 struct decl_field fp;
15259 memset (&fp, 0, sizeof (fp));
15261 gdb_assert (type_can_define_types (die));
15263 /* Get name of field. NULL is okay here, meaning an anonymous type. */
15264 fp.name = dwarf2_name (die, cu);
15265 fp.type = read_type_die (die, cu);
15267 /* Save accessibility. */
15268 enum dwarf_access_attribute accessibility;
15269 struct attribute *attr = dwarf2_attr (die, DW_AT_accessibility, cu);
15271 accessibility = (enum dwarf_access_attribute) DW_UNSND (attr);
15273 accessibility = dwarf2_default_access_attribute (die, cu);
15274 switch (accessibility)
15276 case DW_ACCESS_public:
15277 /* The assumed value if neither private nor protected. */
15279 case DW_ACCESS_private:
15282 case DW_ACCESS_protected:
15283 fp.is_protected = 1;
15286 complaint (_("Unhandled DW_AT_accessibility value (%x)"), accessibility);
15289 if (die->tag == DW_TAG_typedef)
15290 fip->typedef_field_list.push_back (fp);
15292 fip->nested_types_list.push_back (fp);
15295 /* Create the vector of fields, and attach it to the type. */
15298 dwarf2_attach_fields_to_type (struct field_info *fip, struct type *type,
15299 struct dwarf2_cu *cu)
15301 int nfields = fip->nfields;
15303 /* Record the field count, allocate space for the array of fields,
15304 and create blank accessibility bitfields if necessary. */
15305 TYPE_NFIELDS (type) = nfields;
15306 TYPE_FIELDS (type) = (struct field *)
15307 TYPE_ZALLOC (type, sizeof (struct field) * nfields);
15309 if (fip->non_public_fields && cu->language != language_ada)
15311 ALLOCATE_CPLUS_STRUCT_TYPE (type);
15313 TYPE_FIELD_PRIVATE_BITS (type) =
15314 (B_TYPE *) TYPE_ALLOC (type, B_BYTES (nfields));
15315 B_CLRALL (TYPE_FIELD_PRIVATE_BITS (type), nfields);
15317 TYPE_FIELD_PROTECTED_BITS (type) =
15318 (B_TYPE *) TYPE_ALLOC (type, B_BYTES (nfields));
15319 B_CLRALL (TYPE_FIELD_PROTECTED_BITS (type), nfields);
15321 TYPE_FIELD_IGNORE_BITS (type) =
15322 (B_TYPE *) TYPE_ALLOC (type, B_BYTES (nfields));
15323 B_CLRALL (TYPE_FIELD_IGNORE_BITS (type), nfields);
15326 /* If the type has baseclasses, allocate and clear a bit vector for
15327 TYPE_FIELD_VIRTUAL_BITS. */
15328 if (!fip->baseclasses.empty () && cu->language != language_ada)
15330 int num_bytes = B_BYTES (fip->baseclasses.size ());
15331 unsigned char *pointer;
15333 ALLOCATE_CPLUS_STRUCT_TYPE (type);
15334 pointer = (unsigned char *) TYPE_ALLOC (type, num_bytes);
15335 TYPE_FIELD_VIRTUAL_BITS (type) = pointer;
15336 B_CLRALL (TYPE_FIELD_VIRTUAL_BITS (type), fip->baseclasses.size ());
15337 TYPE_N_BASECLASSES (type) = fip->baseclasses.size ();
15340 if (TYPE_FLAG_DISCRIMINATED_UNION (type))
15342 struct discriminant_info *di = alloc_discriminant_info (type, -1, -1);
15344 for (int index = 0; index < nfields; ++index)
15346 struct nextfield &field = fip->fields[index];
15348 if (field.variant.is_discriminant)
15349 di->discriminant_index = index;
15350 else if (field.variant.default_branch)
15351 di->default_index = index;
15353 di->discriminants[index] = field.variant.discriminant_value;
15357 /* Copy the saved-up fields into the field vector. */
15358 for (int i = 0; i < nfields; ++i)
15360 struct nextfield &field
15361 = ((i < fip->baseclasses.size ()) ? fip->baseclasses[i]
15362 : fip->fields[i - fip->baseclasses.size ()]);
15364 TYPE_FIELD (type, i) = field.field;
15365 switch (field.accessibility)
15367 case DW_ACCESS_private:
15368 if (cu->language != language_ada)
15369 SET_TYPE_FIELD_PRIVATE (type, i);
15372 case DW_ACCESS_protected:
15373 if (cu->language != language_ada)
15374 SET_TYPE_FIELD_PROTECTED (type, i);
15377 case DW_ACCESS_public:
15381 /* Unknown accessibility. Complain and treat it as public. */
15383 complaint (_("unsupported accessibility %d"),
15384 field.accessibility);
15388 if (i < fip->baseclasses.size ())
15390 switch (field.virtuality)
15392 case DW_VIRTUALITY_virtual:
15393 case DW_VIRTUALITY_pure_virtual:
15394 if (cu->language == language_ada)
15395 error (_("unexpected virtuality in component of Ada type"));
15396 SET_TYPE_FIELD_VIRTUAL (type, i);
15403 /* Return true if this member function is a constructor, false
15407 dwarf2_is_constructor (struct die_info *die, struct dwarf2_cu *cu)
15409 const char *fieldname;
15410 const char *type_name;
15413 if (die->parent == NULL)
15416 if (die->parent->tag != DW_TAG_structure_type
15417 && die->parent->tag != DW_TAG_union_type
15418 && die->parent->tag != DW_TAG_class_type)
15421 fieldname = dwarf2_name (die, cu);
15422 type_name = dwarf2_name (die->parent, cu);
15423 if (fieldname == NULL || type_name == NULL)
15426 len = strlen (fieldname);
15427 return (strncmp (fieldname, type_name, len) == 0
15428 && (type_name[len] == '\0' || type_name[len] == '<'));
15431 /* Add a member function to the proper fieldlist. */
15434 dwarf2_add_member_fn (struct field_info *fip, struct die_info *die,
15435 struct type *type, struct dwarf2_cu *cu)
15437 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
15438 struct attribute *attr;
15440 struct fnfieldlist *flp = nullptr;
15441 struct fn_field *fnp;
15442 const char *fieldname;
15443 struct type *this_type;
15444 enum dwarf_access_attribute accessibility;
15446 if (cu->language == language_ada)
15447 error (_("unexpected member function in Ada type"));
15449 /* Get name of member function. */
15450 fieldname = dwarf2_name (die, cu);
15451 if (fieldname == NULL)
15454 /* Look up member function name in fieldlist. */
15455 for (i = 0; i < fip->fnfieldlists.size (); i++)
15457 if (strcmp (fip->fnfieldlists[i].name, fieldname) == 0)
15459 flp = &fip->fnfieldlists[i];
15464 /* Create a new fnfieldlist if necessary. */
15465 if (flp == nullptr)
15467 fip->fnfieldlists.emplace_back ();
15468 flp = &fip->fnfieldlists.back ();
15469 flp->name = fieldname;
15470 i = fip->fnfieldlists.size () - 1;
15473 /* Create a new member function field and add it to the vector of
15475 flp->fnfields.emplace_back ();
15476 fnp = &flp->fnfields.back ();
15478 /* Delay processing of the physname until later. */
15479 if (cu->language == language_cplus)
15480 add_to_method_list (type, i, flp->fnfields.size () - 1, fieldname,
15484 const char *physname = dwarf2_physname (fieldname, die, cu);
15485 fnp->physname = physname ? physname : "";
15488 fnp->type = alloc_type (objfile);
15489 this_type = read_type_die (die, cu);
15490 if (this_type && TYPE_CODE (this_type) == TYPE_CODE_FUNC)
15492 int nparams = TYPE_NFIELDS (this_type);
15494 /* TYPE is the domain of this method, and THIS_TYPE is the type
15495 of the method itself (TYPE_CODE_METHOD). */
15496 smash_to_method_type (fnp->type, type,
15497 TYPE_TARGET_TYPE (this_type),
15498 TYPE_FIELDS (this_type),
15499 TYPE_NFIELDS (this_type),
15500 TYPE_VARARGS (this_type));
15502 /* Handle static member functions.
15503 Dwarf2 has no clean way to discern C++ static and non-static
15504 member functions. G++ helps GDB by marking the first
15505 parameter for non-static member functions (which is the this
15506 pointer) as artificial. We obtain this information from
15507 read_subroutine_type via TYPE_FIELD_ARTIFICIAL. */
15508 if (nparams == 0 || TYPE_FIELD_ARTIFICIAL (this_type, 0) == 0)
15509 fnp->voffset = VOFFSET_STATIC;
15512 complaint (_("member function type missing for '%s'"),
15513 dwarf2_full_name (fieldname, die, cu));
15515 /* Get fcontext from DW_AT_containing_type if present. */
15516 if (dwarf2_attr (die, DW_AT_containing_type, cu) != NULL)
15517 fnp->fcontext = die_containing_type (die, cu);
15519 /* dwarf2 doesn't have stubbed physical names, so the setting of is_const and
15520 is_volatile is irrelevant, as it is needed by gdb_mangle_name only. */
15522 /* Get accessibility. */
15523 attr = dwarf2_attr (die, DW_AT_accessibility, cu);
15525 accessibility = (enum dwarf_access_attribute) DW_UNSND (attr);
15527 accessibility = dwarf2_default_access_attribute (die, cu);
15528 switch (accessibility)
15530 case DW_ACCESS_private:
15531 fnp->is_private = 1;
15533 case DW_ACCESS_protected:
15534 fnp->is_protected = 1;
15538 /* Check for artificial methods. */
15539 attr = dwarf2_attr (die, DW_AT_artificial, cu);
15540 if (attr && DW_UNSND (attr) != 0)
15541 fnp->is_artificial = 1;
15543 fnp->is_constructor = dwarf2_is_constructor (die, cu);
15545 /* Get index in virtual function table if it is a virtual member
15546 function. For older versions of GCC, this is an offset in the
15547 appropriate virtual table, as specified by DW_AT_containing_type.
15548 For everyone else, it is an expression to be evaluated relative
15549 to the object address. */
15551 attr = dwarf2_attr (die, DW_AT_vtable_elem_location, cu);
15554 if (attr_form_is_block (attr) && DW_BLOCK (attr)->size > 0)
15556 if (DW_BLOCK (attr)->data[0] == DW_OP_constu)
15558 /* Old-style GCC. */
15559 fnp->voffset = decode_locdesc (DW_BLOCK (attr), cu) + 2;
15561 else if (DW_BLOCK (attr)->data[0] == DW_OP_deref
15562 || (DW_BLOCK (attr)->size > 1
15563 && DW_BLOCK (attr)->data[0] == DW_OP_deref_size
15564 && DW_BLOCK (attr)->data[1] == cu->header.addr_size))
15566 fnp->voffset = decode_locdesc (DW_BLOCK (attr), cu);
15567 if ((fnp->voffset % cu->header.addr_size) != 0)
15568 dwarf2_complex_location_expr_complaint ();
15570 fnp->voffset /= cu->header.addr_size;
15574 dwarf2_complex_location_expr_complaint ();
15576 if (!fnp->fcontext)
15578 /* If there is no `this' field and no DW_AT_containing_type,
15579 we cannot actually find a base class context for the
15581 if (TYPE_NFIELDS (this_type) == 0
15582 || !TYPE_FIELD_ARTIFICIAL (this_type, 0))
15584 complaint (_("cannot determine context for virtual member "
15585 "function \"%s\" (offset %s)"),
15586 fieldname, sect_offset_str (die->sect_off));
15591 = TYPE_TARGET_TYPE (TYPE_FIELD_TYPE (this_type, 0));
15595 else if (attr_form_is_section_offset (attr))
15597 dwarf2_complex_location_expr_complaint ();
15601 dwarf2_invalid_attrib_class_complaint ("DW_AT_vtable_elem_location",
15607 attr = dwarf2_attr (die, DW_AT_virtuality, cu);
15608 if (attr && DW_UNSND (attr))
15610 /* GCC does this, as of 2008-08-25; PR debug/37237. */
15611 complaint (_("Member function \"%s\" (offset %s) is virtual "
15612 "but the vtable offset is not specified"),
15613 fieldname, sect_offset_str (die->sect_off));
15614 ALLOCATE_CPLUS_STRUCT_TYPE (type);
15615 TYPE_CPLUS_DYNAMIC (type) = 1;
15620 /* Create the vector of member function fields, and attach it to the type. */
15623 dwarf2_attach_fn_fields_to_type (struct field_info *fip, struct type *type,
15624 struct dwarf2_cu *cu)
15626 if (cu->language == language_ada)
15627 error (_("unexpected member functions in Ada type"));
15629 ALLOCATE_CPLUS_STRUCT_TYPE (type);
15630 TYPE_FN_FIELDLISTS (type) = (struct fn_fieldlist *)
15632 sizeof (struct fn_fieldlist) * fip->fnfieldlists.size ());
15634 for (int i = 0; i < fip->fnfieldlists.size (); i++)
15636 struct fnfieldlist &nf = fip->fnfieldlists[i];
15637 struct fn_fieldlist *fn_flp = &TYPE_FN_FIELDLIST (type, i);
15639 TYPE_FN_FIELDLIST_NAME (type, i) = nf.name;
15640 TYPE_FN_FIELDLIST_LENGTH (type, i) = nf.fnfields.size ();
15641 fn_flp->fn_fields = (struct fn_field *)
15642 TYPE_ALLOC (type, sizeof (struct fn_field) * nf.fnfields.size ());
15644 for (int k = 0; k < nf.fnfields.size (); ++k)
15645 fn_flp->fn_fields[k] = nf.fnfields[k];
15648 TYPE_NFN_FIELDS (type) = fip->fnfieldlists.size ();
15651 /* Returns non-zero if NAME is the name of a vtable member in CU's
15652 language, zero otherwise. */
15654 is_vtable_name (const char *name, struct dwarf2_cu *cu)
15656 static const char vptr[] = "_vptr";
15658 /* Look for the C++ form of the vtable. */
15659 if (startswith (name, vptr) && is_cplus_marker (name[sizeof (vptr) - 1]))
15665 /* GCC outputs unnamed structures that are really pointers to member
15666 functions, with the ABI-specified layout. If TYPE describes
15667 such a structure, smash it into a member function type.
15669 GCC shouldn't do this; it should just output pointer to member DIEs.
15670 This is GCC PR debug/28767. */
15673 quirk_gcc_member_function_pointer (struct type *type, struct objfile *objfile)
15675 struct type *pfn_type, *self_type, *new_type;
15677 /* Check for a structure with no name and two children. */
15678 if (TYPE_CODE (type) != TYPE_CODE_STRUCT || TYPE_NFIELDS (type) != 2)
15681 /* Check for __pfn and __delta members. */
15682 if (TYPE_FIELD_NAME (type, 0) == NULL
15683 || strcmp (TYPE_FIELD_NAME (type, 0), "__pfn") != 0
15684 || TYPE_FIELD_NAME (type, 1) == NULL
15685 || strcmp (TYPE_FIELD_NAME (type, 1), "__delta") != 0)
15688 /* Find the type of the method. */
15689 pfn_type = TYPE_FIELD_TYPE (type, 0);
15690 if (pfn_type == NULL
15691 || TYPE_CODE (pfn_type) != TYPE_CODE_PTR
15692 || TYPE_CODE (TYPE_TARGET_TYPE (pfn_type)) != TYPE_CODE_FUNC)
15695 /* Look for the "this" argument. */
15696 pfn_type = TYPE_TARGET_TYPE (pfn_type);
15697 if (TYPE_NFIELDS (pfn_type) == 0
15698 /* || TYPE_FIELD_TYPE (pfn_type, 0) == NULL */
15699 || TYPE_CODE (TYPE_FIELD_TYPE (pfn_type, 0)) != TYPE_CODE_PTR)
15702 self_type = TYPE_TARGET_TYPE (TYPE_FIELD_TYPE (pfn_type, 0));
15703 new_type = alloc_type (objfile);
15704 smash_to_method_type (new_type, self_type, TYPE_TARGET_TYPE (pfn_type),
15705 TYPE_FIELDS (pfn_type), TYPE_NFIELDS (pfn_type),
15706 TYPE_VARARGS (pfn_type));
15707 smash_to_methodptr_type (type, new_type);
15710 /* If the DIE has a DW_AT_alignment attribute, return its value, doing
15711 appropriate error checking and issuing complaints if there is a
15715 get_alignment (struct dwarf2_cu *cu, struct die_info *die)
15717 struct attribute *attr = dwarf2_attr (die, DW_AT_alignment, cu);
15719 if (attr == nullptr)
15722 if (!attr_form_is_constant (attr))
15724 complaint (_("DW_AT_alignment must have constant form"
15725 " - DIE at %s [in module %s]"),
15726 sect_offset_str (die->sect_off),
15727 objfile_name (cu->per_cu->dwarf2_per_objfile->objfile));
15732 if (attr->form == DW_FORM_sdata)
15734 LONGEST val = DW_SND (attr);
15737 complaint (_("DW_AT_alignment value must not be negative"
15738 " - DIE at %s [in module %s]"),
15739 sect_offset_str (die->sect_off),
15740 objfile_name (cu->per_cu->dwarf2_per_objfile->objfile));
15746 align = DW_UNSND (attr);
15750 complaint (_("DW_AT_alignment value must not be zero"
15751 " - DIE at %s [in module %s]"),
15752 sect_offset_str (die->sect_off),
15753 objfile_name (cu->per_cu->dwarf2_per_objfile->objfile));
15756 if ((align & (align - 1)) != 0)
15758 complaint (_("DW_AT_alignment value must be a power of 2"
15759 " - DIE at %s [in module %s]"),
15760 sect_offset_str (die->sect_off),
15761 objfile_name (cu->per_cu->dwarf2_per_objfile->objfile));
15768 /* If the DIE has a DW_AT_alignment attribute, use its value to set
15769 the alignment for TYPE. */
15772 maybe_set_alignment (struct dwarf2_cu *cu, struct die_info *die,
15775 if (!set_type_align (type, get_alignment (cu, die)))
15776 complaint (_("DW_AT_alignment value too large"
15777 " - DIE at %s [in module %s]"),
15778 sect_offset_str (die->sect_off),
15779 objfile_name (cu->per_cu->dwarf2_per_objfile->objfile));
15782 /* Called when we find the DIE that starts a structure or union scope
15783 (definition) to create a type for the structure or union. Fill in
15784 the type's name and general properties; the members will not be
15785 processed until process_structure_scope. A symbol table entry for
15786 the type will also not be done until process_structure_scope (assuming
15787 the type has a name).
15789 NOTE: we need to call these functions regardless of whether or not the
15790 DIE has a DW_AT_name attribute, since it might be an anonymous
15791 structure or union. This gets the type entered into our set of
15792 user defined types. */
15794 static struct type *
15795 read_structure_type (struct die_info *die, struct dwarf2_cu *cu)
15797 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
15799 struct attribute *attr;
15802 /* If the definition of this type lives in .debug_types, read that type.
15803 Don't follow DW_AT_specification though, that will take us back up
15804 the chain and we want to go down. */
15805 attr = dwarf2_attr_no_follow (die, DW_AT_signature);
15808 type = get_DW_AT_signature_type (die, attr, cu);
15810 /* The type's CU may not be the same as CU.
15811 Ensure TYPE is recorded with CU in die_type_hash. */
15812 return set_die_type (die, type, cu);
15815 type = alloc_type (objfile);
15816 INIT_CPLUS_SPECIFIC (type);
15818 name = dwarf2_name (die, cu);
15821 if (cu->language == language_cplus
15822 || cu->language == language_d
15823 || cu->language == language_rust)
15825 const char *full_name = dwarf2_full_name (name, die, cu);
15827 /* dwarf2_full_name might have already finished building the DIE's
15828 type. If so, there is no need to continue. */
15829 if (get_die_type (die, cu) != NULL)
15830 return get_die_type (die, cu);
15832 TYPE_NAME (type) = full_name;
15836 /* The name is already allocated along with this objfile, so
15837 we don't need to duplicate it for the type. */
15838 TYPE_NAME (type) = name;
15842 if (die->tag == DW_TAG_structure_type)
15844 TYPE_CODE (type) = TYPE_CODE_STRUCT;
15846 else if (die->tag == DW_TAG_union_type)
15848 TYPE_CODE (type) = TYPE_CODE_UNION;
15850 else if (die->tag == DW_TAG_variant_part)
15852 TYPE_CODE (type) = TYPE_CODE_UNION;
15853 TYPE_FLAG_DISCRIMINATED_UNION (type) = 1;
15857 TYPE_CODE (type) = TYPE_CODE_STRUCT;
15860 if (cu->language == language_cplus && die->tag == DW_TAG_class_type)
15861 TYPE_DECLARED_CLASS (type) = 1;
15863 attr = dwarf2_attr (die, DW_AT_byte_size, cu);
15866 if (attr_form_is_constant (attr))
15867 TYPE_LENGTH (type) = DW_UNSND (attr);
15870 /* For the moment, dynamic type sizes are not supported
15871 by GDB's struct type. The actual size is determined
15872 on-demand when resolving the type of a given object,
15873 so set the type's length to zero for now. Otherwise,
15874 we record an expression as the length, and that expression
15875 could lead to a very large value, which could eventually
15876 lead to us trying to allocate that much memory when creating
15877 a value of that type. */
15878 TYPE_LENGTH (type) = 0;
15883 TYPE_LENGTH (type) = 0;
15886 maybe_set_alignment (cu, die, type);
15888 if (producer_is_icc_lt_14 (cu) && (TYPE_LENGTH (type) == 0))
15890 /* ICC<14 does not output the required DW_AT_declaration on
15891 incomplete types, but gives them a size of zero. */
15892 TYPE_STUB (type) = 1;
15895 TYPE_STUB_SUPPORTED (type) = 1;
15897 if (die_is_declaration (die, cu))
15898 TYPE_STUB (type) = 1;
15899 else if (attr == NULL && die->child == NULL
15900 && producer_is_realview (cu->producer))
15901 /* RealView does not output the required DW_AT_declaration
15902 on incomplete types. */
15903 TYPE_STUB (type) = 1;
15905 /* We need to add the type field to the die immediately so we don't
15906 infinitely recurse when dealing with pointers to the structure
15907 type within the structure itself. */
15908 set_die_type (die, type, cu);
15910 /* set_die_type should be already done. */
15911 set_descriptive_type (type, die, cu);
15916 /* A helper for process_structure_scope that handles a single member
15920 handle_struct_member_die (struct die_info *child_die, struct type *type,
15921 struct field_info *fi,
15922 std::vector<struct symbol *> *template_args,
15923 struct dwarf2_cu *cu)
15925 if (child_die->tag == DW_TAG_member
15926 || child_die->tag == DW_TAG_variable
15927 || child_die->tag == DW_TAG_variant_part)
15929 /* NOTE: carlton/2002-11-05: A C++ static data member
15930 should be a DW_TAG_member that is a declaration, but
15931 all versions of G++ as of this writing (so through at
15932 least 3.2.1) incorrectly generate DW_TAG_variable
15933 tags for them instead. */
15934 dwarf2_add_field (fi, child_die, cu);
15936 else if (child_die->tag == DW_TAG_subprogram)
15938 /* Rust doesn't have member functions in the C++ sense.
15939 However, it does emit ordinary functions as children
15940 of a struct DIE. */
15941 if (cu->language == language_rust)
15942 read_func_scope (child_die, cu);
15945 /* C++ member function. */
15946 dwarf2_add_member_fn (fi, child_die, type, cu);
15949 else if (child_die->tag == DW_TAG_inheritance)
15951 /* C++ base class field. */
15952 dwarf2_add_field (fi, child_die, cu);
15954 else if (type_can_define_types (child_die))
15955 dwarf2_add_type_defn (fi, child_die, cu);
15956 else if (child_die->tag == DW_TAG_template_type_param
15957 || child_die->tag == DW_TAG_template_value_param)
15959 struct symbol *arg = new_symbol (child_die, NULL, cu);
15962 template_args->push_back (arg);
15964 else if (child_die->tag == DW_TAG_variant)
15966 /* In a variant we want to get the discriminant and also add a
15967 field for our sole member child. */
15968 struct attribute *discr = dwarf2_attr (child_die, DW_AT_discr_value, cu);
15970 for (die_info *variant_child = child_die->child;
15971 variant_child != NULL;
15972 variant_child = sibling_die (variant_child))
15974 if (variant_child->tag == DW_TAG_member)
15976 handle_struct_member_die (variant_child, type, fi,
15977 template_args, cu);
15978 /* Only handle the one. */
15983 /* We don't handle this but we might as well report it if we see
15985 if (dwarf2_attr (child_die, DW_AT_discr_list, cu) != nullptr)
15986 complaint (_("DW_AT_discr_list is not supported yet"
15987 " - DIE at %s [in module %s]"),
15988 sect_offset_str (child_die->sect_off),
15989 objfile_name (cu->per_cu->dwarf2_per_objfile->objfile));
15991 /* The first field was just added, so we can stash the
15992 discriminant there. */
15993 gdb_assert (!fi->fields.empty ());
15995 fi->fields.back ().variant.default_branch = true;
15997 fi->fields.back ().variant.discriminant_value = DW_UNSND (discr);
16001 /* Finish creating a structure or union type, including filling in
16002 its members and creating a symbol for it. */
16005 process_structure_scope (struct die_info *die, struct dwarf2_cu *cu)
16007 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
16008 struct die_info *child_die;
16011 type = get_die_type (die, cu);
16013 type = read_structure_type (die, cu);
16015 /* When reading a DW_TAG_variant_part, we need to notice when we
16016 read the discriminant member, so we can record it later in the
16017 discriminant_info. */
16018 bool is_variant_part = TYPE_FLAG_DISCRIMINATED_UNION (type);
16019 sect_offset discr_offset;
16020 bool has_template_parameters = false;
16022 if (is_variant_part)
16024 struct attribute *discr = dwarf2_attr (die, DW_AT_discr, cu);
16027 /* Maybe it's a univariant form, an extension we support.
16028 In this case arrange not to check the offset. */
16029 is_variant_part = false;
16031 else if (attr_form_is_ref (discr))
16033 struct dwarf2_cu *target_cu = cu;
16034 struct die_info *target_die = follow_die_ref (die, discr, &target_cu);
16036 discr_offset = target_die->sect_off;
16040 complaint (_("DW_AT_discr does not have DIE reference form"
16041 " - DIE at %s [in module %s]"),
16042 sect_offset_str (die->sect_off),
16043 objfile_name (cu->per_cu->dwarf2_per_objfile->objfile));
16044 is_variant_part = false;
16048 if (die->child != NULL && ! die_is_declaration (die, cu))
16050 struct field_info fi;
16051 std::vector<struct symbol *> template_args;
16053 child_die = die->child;
16055 while (child_die && child_die->tag)
16057 handle_struct_member_die (child_die, type, &fi, &template_args, cu);
16059 if (is_variant_part && discr_offset == child_die->sect_off)
16060 fi.fields.back ().variant.is_discriminant = true;
16062 child_die = sibling_die (child_die);
16065 /* Attach template arguments to type. */
16066 if (!template_args.empty ())
16068 has_template_parameters = true;
16069 ALLOCATE_CPLUS_STRUCT_TYPE (type);
16070 TYPE_N_TEMPLATE_ARGUMENTS (type) = template_args.size ();
16071 TYPE_TEMPLATE_ARGUMENTS (type)
16072 = XOBNEWVEC (&objfile->objfile_obstack,
16074 TYPE_N_TEMPLATE_ARGUMENTS (type));
16075 memcpy (TYPE_TEMPLATE_ARGUMENTS (type),
16076 template_args.data (),
16077 (TYPE_N_TEMPLATE_ARGUMENTS (type)
16078 * sizeof (struct symbol *)));
16081 /* Attach fields and member functions to the type. */
16083 dwarf2_attach_fields_to_type (&fi, type, cu);
16084 if (!fi.fnfieldlists.empty ())
16086 dwarf2_attach_fn_fields_to_type (&fi, type, cu);
16088 /* Get the type which refers to the base class (possibly this
16089 class itself) which contains the vtable pointer for the current
16090 class from the DW_AT_containing_type attribute. This use of
16091 DW_AT_containing_type is a GNU extension. */
16093 if (dwarf2_attr (die, DW_AT_containing_type, cu) != NULL)
16095 struct type *t = die_containing_type (die, cu);
16097 set_type_vptr_basetype (type, t);
16102 /* Our own class provides vtbl ptr. */
16103 for (i = TYPE_NFIELDS (t) - 1;
16104 i >= TYPE_N_BASECLASSES (t);
16107 const char *fieldname = TYPE_FIELD_NAME (t, i);
16109 if (is_vtable_name (fieldname, cu))
16111 set_type_vptr_fieldno (type, i);
16116 /* Complain if virtual function table field not found. */
16117 if (i < TYPE_N_BASECLASSES (t))
16118 complaint (_("virtual function table pointer "
16119 "not found when defining class '%s'"),
16120 TYPE_NAME (type) ? TYPE_NAME (type) : "");
16124 set_type_vptr_fieldno (type, TYPE_VPTR_FIELDNO (t));
16127 else if (cu->producer
16128 && startswith (cu->producer, "IBM(R) XL C/C++ Advanced Edition"))
16130 /* The IBM XLC compiler does not provide direct indication
16131 of the containing type, but the vtable pointer is
16132 always named __vfp. */
16136 for (i = TYPE_NFIELDS (type) - 1;
16137 i >= TYPE_N_BASECLASSES (type);
16140 if (strcmp (TYPE_FIELD_NAME (type, i), "__vfp") == 0)
16142 set_type_vptr_fieldno (type, i);
16143 set_type_vptr_basetype (type, type);
16150 /* Copy fi.typedef_field_list linked list elements content into the
16151 allocated array TYPE_TYPEDEF_FIELD_ARRAY (type). */
16152 if (!fi.typedef_field_list.empty ())
16154 int count = fi.typedef_field_list.size ();
16156 ALLOCATE_CPLUS_STRUCT_TYPE (type);
16157 TYPE_TYPEDEF_FIELD_ARRAY (type)
16158 = ((struct decl_field *)
16160 sizeof (TYPE_TYPEDEF_FIELD (type, 0)) * count));
16161 TYPE_TYPEDEF_FIELD_COUNT (type) = count;
16163 for (int i = 0; i < fi.typedef_field_list.size (); ++i)
16164 TYPE_TYPEDEF_FIELD (type, i) = fi.typedef_field_list[i];
16167 /* Copy fi.nested_types_list linked list elements content into the
16168 allocated array TYPE_NESTED_TYPES_ARRAY (type). */
16169 if (!fi.nested_types_list.empty () && cu->language != language_ada)
16171 int count = fi.nested_types_list.size ();
16173 ALLOCATE_CPLUS_STRUCT_TYPE (type);
16174 TYPE_NESTED_TYPES_ARRAY (type)
16175 = ((struct decl_field *)
16176 TYPE_ALLOC (type, sizeof (struct decl_field) * count));
16177 TYPE_NESTED_TYPES_COUNT (type) = count;
16179 for (int i = 0; i < fi.nested_types_list.size (); ++i)
16180 TYPE_NESTED_TYPES_FIELD (type, i) = fi.nested_types_list[i];
16184 quirk_gcc_member_function_pointer (type, objfile);
16185 if (cu->language == language_rust && die->tag == DW_TAG_union_type)
16186 cu->rust_unions.push_back (type);
16188 /* NOTE: carlton/2004-03-16: GCC 3.4 (or at least one of its
16189 snapshots) has been known to create a die giving a declaration
16190 for a class that has, as a child, a die giving a definition for a
16191 nested class. So we have to process our children even if the
16192 current die is a declaration. Normally, of course, a declaration
16193 won't have any children at all. */
16195 child_die = die->child;
16197 while (child_die != NULL && child_die->tag)
16199 if (child_die->tag == DW_TAG_member
16200 || child_die->tag == DW_TAG_variable
16201 || child_die->tag == DW_TAG_inheritance
16202 || child_die->tag == DW_TAG_template_value_param
16203 || child_die->tag == DW_TAG_template_type_param)
16208 process_die (child_die, cu);
16210 child_die = sibling_die (child_die);
16213 /* Do not consider external references. According to the DWARF standard,
16214 these DIEs are identified by the fact that they have no byte_size
16215 attribute, and a declaration attribute. */
16216 if (dwarf2_attr (die, DW_AT_byte_size, cu) != NULL
16217 || !die_is_declaration (die, cu))
16219 struct symbol *sym = new_symbol (die, type, cu);
16221 if (has_template_parameters)
16223 struct symtab *symtab;
16224 if (sym != nullptr)
16225 symtab = symbol_symtab (sym);
16226 else if (cu->line_header != nullptr)
16228 /* Any related symtab will do. */
16230 = cu->line_header->file_name_at (file_name_index (1))->symtab;
16235 complaint (_("could not find suitable "
16236 "symtab for template parameter"
16237 " - DIE at %s [in module %s]"),
16238 sect_offset_str (die->sect_off),
16239 objfile_name (objfile));
16242 if (symtab != nullptr)
16244 /* Make sure that the symtab is set on the new symbols.
16245 Even though they don't appear in this symtab directly,
16246 other parts of gdb assume that symbols do, and this is
16247 reasonably true. */
16248 for (int i = 0; i < TYPE_N_TEMPLATE_ARGUMENTS (type); ++i)
16249 symbol_set_symtab (TYPE_TEMPLATE_ARGUMENT (type, i), symtab);
16255 /* Assuming DIE is an enumeration type, and TYPE is its associated type,
16256 update TYPE using some information only available in DIE's children. */
16259 update_enumeration_type_from_children (struct die_info *die,
16261 struct dwarf2_cu *cu)
16263 struct die_info *child_die;
16264 int unsigned_enum = 1;
16268 auto_obstack obstack;
16270 for (child_die = die->child;
16271 child_die != NULL && child_die->tag;
16272 child_die = sibling_die (child_die))
16274 struct attribute *attr;
16276 const gdb_byte *bytes;
16277 struct dwarf2_locexpr_baton *baton;
16280 if (child_die->tag != DW_TAG_enumerator)
16283 attr = dwarf2_attr (child_die, DW_AT_const_value, cu);
16287 name = dwarf2_name (child_die, cu);
16289 name = "<anonymous enumerator>";
16291 dwarf2_const_value_attr (attr, type, name, &obstack, cu,
16292 &value, &bytes, &baton);
16298 else if ((mask & value) != 0)
16303 /* If we already know that the enum type is neither unsigned, nor
16304 a flag type, no need to look at the rest of the enumerates. */
16305 if (!unsigned_enum && !flag_enum)
16310 TYPE_UNSIGNED (type) = 1;
16312 TYPE_FLAG_ENUM (type) = 1;
16315 /* Given a DW_AT_enumeration_type die, set its type. We do not
16316 complete the type's fields yet, or create any symbols. */
16318 static struct type *
16319 read_enumeration_type (struct die_info *die, struct dwarf2_cu *cu)
16321 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
16323 struct attribute *attr;
16326 /* If the definition of this type lives in .debug_types, read that type.
16327 Don't follow DW_AT_specification though, that will take us back up
16328 the chain and we want to go down. */
16329 attr = dwarf2_attr_no_follow (die, DW_AT_signature);
16332 type = get_DW_AT_signature_type (die, attr, cu);
16334 /* The type's CU may not be the same as CU.
16335 Ensure TYPE is recorded with CU in die_type_hash. */
16336 return set_die_type (die, type, cu);
16339 type = alloc_type (objfile);
16341 TYPE_CODE (type) = TYPE_CODE_ENUM;
16342 name = dwarf2_full_name (NULL, die, cu);
16344 TYPE_NAME (type) = name;
16346 attr = dwarf2_attr (die, DW_AT_type, cu);
16349 struct type *underlying_type = die_type (die, cu);
16351 TYPE_TARGET_TYPE (type) = underlying_type;
16354 attr = dwarf2_attr (die, DW_AT_byte_size, cu);
16357 TYPE_LENGTH (type) = DW_UNSND (attr);
16361 TYPE_LENGTH (type) = 0;
16364 maybe_set_alignment (cu, die, type);
16366 /* The enumeration DIE can be incomplete. In Ada, any type can be
16367 declared as private in the package spec, and then defined only
16368 inside the package body. Such types are known as Taft Amendment
16369 Types. When another package uses such a type, an incomplete DIE
16370 may be generated by the compiler. */
16371 if (die_is_declaration (die, cu))
16372 TYPE_STUB (type) = 1;
16374 /* Finish the creation of this type by using the enum's children.
16375 We must call this even when the underlying type has been provided
16376 so that we can determine if we're looking at a "flag" enum. */
16377 update_enumeration_type_from_children (die, type, cu);
16379 /* If this type has an underlying type that is not a stub, then we
16380 may use its attributes. We always use the "unsigned" attribute
16381 in this situation, because ordinarily we guess whether the type
16382 is unsigned -- but the guess can be wrong and the underlying type
16383 can tell us the reality. However, we defer to a local size
16384 attribute if one exists, because this lets the compiler override
16385 the underlying type if needed. */
16386 if (TYPE_TARGET_TYPE (type) != NULL && !TYPE_STUB (TYPE_TARGET_TYPE (type)))
16388 TYPE_UNSIGNED (type) = TYPE_UNSIGNED (TYPE_TARGET_TYPE (type));
16389 if (TYPE_LENGTH (type) == 0)
16390 TYPE_LENGTH (type) = TYPE_LENGTH (TYPE_TARGET_TYPE (type));
16391 if (TYPE_RAW_ALIGN (type) == 0
16392 && TYPE_RAW_ALIGN (TYPE_TARGET_TYPE (type)) != 0)
16393 set_type_align (type, TYPE_RAW_ALIGN (TYPE_TARGET_TYPE (type)));
16396 TYPE_DECLARED_CLASS (type) = dwarf2_flag_true_p (die, DW_AT_enum_class, cu);
16398 return set_die_type (die, type, cu);
16401 /* Given a pointer to a die which begins an enumeration, process all
16402 the dies that define the members of the enumeration, and create the
16403 symbol for the enumeration type.
16405 NOTE: We reverse the order of the element list. */
16408 process_enumeration_scope (struct die_info *die, struct dwarf2_cu *cu)
16410 struct type *this_type;
16412 this_type = get_die_type (die, cu);
16413 if (this_type == NULL)
16414 this_type = read_enumeration_type (die, cu);
16416 if (die->child != NULL)
16418 struct die_info *child_die;
16419 struct symbol *sym;
16420 struct field *fields = NULL;
16421 int num_fields = 0;
16424 child_die = die->child;
16425 while (child_die && child_die->tag)
16427 if (child_die->tag != DW_TAG_enumerator)
16429 process_die (child_die, cu);
16433 name = dwarf2_name (child_die, cu);
16436 sym = new_symbol (child_die, this_type, cu);
16438 if ((num_fields % DW_FIELD_ALLOC_CHUNK) == 0)
16440 fields = (struct field *)
16442 (num_fields + DW_FIELD_ALLOC_CHUNK)
16443 * sizeof (struct field));
16446 FIELD_NAME (fields[num_fields]) = SYMBOL_LINKAGE_NAME (sym);
16447 FIELD_TYPE (fields[num_fields]) = NULL;
16448 SET_FIELD_ENUMVAL (fields[num_fields], SYMBOL_VALUE (sym));
16449 FIELD_BITSIZE (fields[num_fields]) = 0;
16455 child_die = sibling_die (child_die);
16460 TYPE_NFIELDS (this_type) = num_fields;
16461 TYPE_FIELDS (this_type) = (struct field *)
16462 TYPE_ALLOC (this_type, sizeof (struct field) * num_fields);
16463 memcpy (TYPE_FIELDS (this_type), fields,
16464 sizeof (struct field) * num_fields);
16469 /* If we are reading an enum from a .debug_types unit, and the enum
16470 is a declaration, and the enum is not the signatured type in the
16471 unit, then we do not want to add a symbol for it. Adding a
16472 symbol would in some cases obscure the true definition of the
16473 enum, giving users an incomplete type when the definition is
16474 actually available. Note that we do not want to do this for all
16475 enums which are just declarations, because C++0x allows forward
16476 enum declarations. */
16477 if (cu->per_cu->is_debug_types
16478 && die_is_declaration (die, cu))
16480 struct signatured_type *sig_type;
16482 sig_type = (struct signatured_type *) cu->per_cu;
16483 gdb_assert (to_underlying (sig_type->type_offset_in_section) != 0);
16484 if (sig_type->type_offset_in_section != die->sect_off)
16488 new_symbol (die, this_type, cu);
16491 /* Extract all information from a DW_TAG_array_type DIE and put it in
16492 the DIE's type field. For now, this only handles one dimensional
16495 static struct type *
16496 read_array_type (struct die_info *die, struct dwarf2_cu *cu)
16498 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
16499 struct die_info *child_die;
16501 struct type *element_type, *range_type, *index_type;
16502 struct attribute *attr;
16504 struct dynamic_prop *byte_stride_prop = NULL;
16505 unsigned int bit_stride = 0;
16507 element_type = die_type (die, cu);
16509 /* The die_type call above may have already set the type for this DIE. */
16510 type = get_die_type (die, cu);
16514 attr = dwarf2_attr (die, DW_AT_byte_stride, cu);
16520 = (struct dynamic_prop *) alloca (sizeof (struct dynamic_prop));
16521 stride_ok = attr_to_dynamic_prop (attr, die, cu, byte_stride_prop);
16524 complaint (_("unable to read array DW_AT_byte_stride "
16525 " - DIE at %s [in module %s]"),
16526 sect_offset_str (die->sect_off),
16527 objfile_name (cu->per_cu->dwarf2_per_objfile->objfile));
16528 /* Ignore this attribute. We will likely not be able to print
16529 arrays of this type correctly, but there is little we can do
16530 to help if we cannot read the attribute's value. */
16531 byte_stride_prop = NULL;
16535 attr = dwarf2_attr (die, DW_AT_bit_stride, cu);
16537 bit_stride = DW_UNSND (attr);
16539 /* Irix 6.2 native cc creates array types without children for
16540 arrays with unspecified length. */
16541 if (die->child == NULL)
16543 index_type = objfile_type (objfile)->builtin_int;
16544 range_type = create_static_range_type (NULL, index_type, 0, -1);
16545 type = create_array_type_with_stride (NULL, element_type, range_type,
16546 byte_stride_prop, bit_stride);
16547 return set_die_type (die, type, cu);
16550 std::vector<struct type *> range_types;
16551 child_die = die->child;
16552 while (child_die && child_die->tag)
16554 if (child_die->tag == DW_TAG_subrange_type)
16556 struct type *child_type = read_type_die (child_die, cu);
16558 if (child_type != NULL)
16560 /* The range type was succesfully read. Save it for the
16561 array type creation. */
16562 range_types.push_back (child_type);
16565 child_die = sibling_die (child_die);
16568 /* Dwarf2 dimensions are output from left to right, create the
16569 necessary array types in backwards order. */
16571 type = element_type;
16573 if (read_array_order (die, cu) == DW_ORD_col_major)
16577 while (i < range_types.size ())
16578 type = create_array_type_with_stride (NULL, type, range_types[i++],
16579 byte_stride_prop, bit_stride);
16583 size_t ndim = range_types.size ();
16585 type = create_array_type_with_stride (NULL, type, range_types[ndim],
16586 byte_stride_prop, bit_stride);
16589 /* Understand Dwarf2 support for vector types (like they occur on
16590 the PowerPC w/ AltiVec). Gcc just adds another attribute to the
16591 array type. This is not part of the Dwarf2/3 standard yet, but a
16592 custom vendor extension. The main difference between a regular
16593 array and the vector variant is that vectors are passed by value
16595 attr = dwarf2_attr (die, DW_AT_GNU_vector, cu);
16597 make_vector_type (type);
16599 /* The DIE may have DW_AT_byte_size set. For example an OpenCL
16600 implementation may choose to implement triple vectors using this
16602 attr = dwarf2_attr (die, DW_AT_byte_size, cu);
16605 if (DW_UNSND (attr) >= TYPE_LENGTH (type))
16606 TYPE_LENGTH (type) = DW_UNSND (attr);
16608 complaint (_("DW_AT_byte_size for array type smaller "
16609 "than the total size of elements"));
16612 name = dwarf2_name (die, cu);
16614 TYPE_NAME (type) = name;
16616 maybe_set_alignment (cu, die, type);
16618 /* Install the type in the die. */
16619 set_die_type (die, type, cu);
16621 /* set_die_type should be already done. */
16622 set_descriptive_type (type, die, cu);
16627 static enum dwarf_array_dim_ordering
16628 read_array_order (struct die_info *die, struct dwarf2_cu *cu)
16630 struct attribute *attr;
16632 attr = dwarf2_attr (die, DW_AT_ordering, cu);
16635 return (enum dwarf_array_dim_ordering) DW_SND (attr);
16637 /* GNU F77 is a special case, as at 08/2004 array type info is the
16638 opposite order to the dwarf2 specification, but data is still
16639 laid out as per normal fortran.
16641 FIXME: dsl/2004-8-20: If G77 is ever fixed, this will also need
16642 version checking. */
16644 if (cu->language == language_fortran
16645 && cu->producer && strstr (cu->producer, "GNU F77"))
16647 return DW_ORD_row_major;
16650 switch (cu->language_defn->la_array_ordering)
16652 case array_column_major:
16653 return DW_ORD_col_major;
16654 case array_row_major:
16656 return DW_ORD_row_major;
16660 /* Extract all information from a DW_TAG_set_type DIE and put it in
16661 the DIE's type field. */
16663 static struct type *
16664 read_set_type (struct die_info *die, struct dwarf2_cu *cu)
16666 struct type *domain_type, *set_type;
16667 struct attribute *attr;
16669 domain_type = die_type (die, cu);
16671 /* The die_type call above may have already set the type for this DIE. */
16672 set_type = get_die_type (die, cu);
16676 set_type = create_set_type (NULL, domain_type);
16678 attr = dwarf2_attr (die, DW_AT_byte_size, cu);
16680 TYPE_LENGTH (set_type) = DW_UNSND (attr);
16682 maybe_set_alignment (cu, die, set_type);
16684 return set_die_type (die, set_type, cu);
16687 /* A helper for read_common_block that creates a locexpr baton.
16688 SYM is the symbol which we are marking as computed.
16689 COMMON_DIE is the DIE for the common block.
16690 COMMON_LOC is the location expression attribute for the common
16692 MEMBER_LOC is the location expression attribute for the particular
16693 member of the common block that we are processing.
16694 CU is the CU from which the above come. */
16697 mark_common_block_symbol_computed (struct symbol *sym,
16698 struct die_info *common_die,
16699 struct attribute *common_loc,
16700 struct attribute *member_loc,
16701 struct dwarf2_cu *cu)
16703 struct dwarf2_per_objfile *dwarf2_per_objfile
16704 = cu->per_cu->dwarf2_per_objfile;
16705 struct objfile *objfile = dwarf2_per_objfile->objfile;
16706 struct dwarf2_locexpr_baton *baton;
16708 unsigned int cu_off;
16709 enum bfd_endian byte_order = gdbarch_byte_order (get_objfile_arch (objfile));
16710 LONGEST offset = 0;
16712 gdb_assert (common_loc && member_loc);
16713 gdb_assert (attr_form_is_block (common_loc));
16714 gdb_assert (attr_form_is_block (member_loc)
16715 || attr_form_is_constant (member_loc));
16717 baton = XOBNEW (&objfile->objfile_obstack, struct dwarf2_locexpr_baton);
16718 baton->per_cu = cu->per_cu;
16719 gdb_assert (baton->per_cu);
16721 baton->size = 5 /* DW_OP_call4 */ + 1 /* DW_OP_plus */;
16723 if (attr_form_is_constant (member_loc))
16725 offset = dwarf2_get_attr_constant_value (member_loc, 0);
16726 baton->size += 1 /* DW_OP_addr */ + cu->header.addr_size;
16729 baton->size += DW_BLOCK (member_loc)->size;
16731 ptr = (gdb_byte *) obstack_alloc (&objfile->objfile_obstack, baton->size);
16734 *ptr++ = DW_OP_call4;
16735 cu_off = common_die->sect_off - cu->per_cu->sect_off;
16736 store_unsigned_integer (ptr, 4, byte_order, cu_off);
16739 if (attr_form_is_constant (member_loc))
16741 *ptr++ = DW_OP_addr;
16742 store_unsigned_integer (ptr, cu->header.addr_size, byte_order, offset);
16743 ptr += cu->header.addr_size;
16747 /* We have to copy the data here, because DW_OP_call4 will only
16748 use a DW_AT_location attribute. */
16749 memcpy (ptr, DW_BLOCK (member_loc)->data, DW_BLOCK (member_loc)->size);
16750 ptr += DW_BLOCK (member_loc)->size;
16753 *ptr++ = DW_OP_plus;
16754 gdb_assert (ptr - baton->data == baton->size);
16756 SYMBOL_LOCATION_BATON (sym) = baton;
16757 SYMBOL_ACLASS_INDEX (sym) = dwarf2_locexpr_index;
16760 /* Create appropriate locally-scoped variables for all the
16761 DW_TAG_common_block entries. Also create a struct common_block
16762 listing all such variables for `info common'. COMMON_BLOCK_DOMAIN
16763 is used to sepate the common blocks name namespace from regular
16767 read_common_block (struct die_info *die, struct dwarf2_cu *cu)
16769 struct attribute *attr;
16771 attr = dwarf2_attr (die, DW_AT_location, cu);
16774 /* Support the .debug_loc offsets. */
16775 if (attr_form_is_block (attr))
16779 else if (attr_form_is_section_offset (attr))
16781 dwarf2_complex_location_expr_complaint ();
16786 dwarf2_invalid_attrib_class_complaint ("DW_AT_location",
16787 "common block member");
16792 if (die->child != NULL)
16794 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
16795 struct die_info *child_die;
16796 size_t n_entries = 0, size;
16797 struct common_block *common_block;
16798 struct symbol *sym;
16800 for (child_die = die->child;
16801 child_die && child_die->tag;
16802 child_die = sibling_die (child_die))
16805 size = (sizeof (struct common_block)
16806 + (n_entries - 1) * sizeof (struct symbol *));
16808 = (struct common_block *) obstack_alloc (&objfile->objfile_obstack,
16810 memset (common_block->contents, 0, n_entries * sizeof (struct symbol *));
16811 common_block->n_entries = 0;
16813 for (child_die = die->child;
16814 child_die && child_die->tag;
16815 child_die = sibling_die (child_die))
16817 /* Create the symbol in the DW_TAG_common_block block in the current
16819 sym = new_symbol (child_die, NULL, cu);
16822 struct attribute *member_loc;
16824 common_block->contents[common_block->n_entries++] = sym;
16826 member_loc = dwarf2_attr (child_die, DW_AT_data_member_location,
16830 /* GDB has handled this for a long time, but it is
16831 not specified by DWARF. It seems to have been
16832 emitted by gfortran at least as recently as:
16833 http://gcc.gnu.org/bugzilla/show_bug.cgi?id=23057. */
16834 complaint (_("Variable in common block has "
16835 "DW_AT_data_member_location "
16836 "- DIE at %s [in module %s]"),
16837 sect_offset_str (child_die->sect_off),
16838 objfile_name (objfile));
16840 if (attr_form_is_section_offset (member_loc))
16841 dwarf2_complex_location_expr_complaint ();
16842 else if (attr_form_is_constant (member_loc)
16843 || attr_form_is_block (member_loc))
16846 mark_common_block_symbol_computed (sym, die, attr,
16850 dwarf2_complex_location_expr_complaint ();
16855 sym = new_symbol (die, objfile_type (objfile)->builtin_void, cu);
16856 SYMBOL_VALUE_COMMON_BLOCK (sym) = common_block;
16860 /* Create a type for a C++ namespace. */
16862 static struct type *
16863 read_namespace_type (struct die_info *die, struct dwarf2_cu *cu)
16865 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
16866 const char *previous_prefix, *name;
16870 /* For extensions, reuse the type of the original namespace. */
16871 if (dwarf2_attr (die, DW_AT_extension, cu) != NULL)
16873 struct die_info *ext_die;
16874 struct dwarf2_cu *ext_cu = cu;
16876 ext_die = dwarf2_extension (die, &ext_cu);
16877 type = read_type_die (ext_die, ext_cu);
16879 /* EXT_CU may not be the same as CU.
16880 Ensure TYPE is recorded with CU in die_type_hash. */
16881 return set_die_type (die, type, cu);
16884 name = namespace_name (die, &is_anonymous, cu);
16886 /* Now build the name of the current namespace. */
16888 previous_prefix = determine_prefix (die, cu);
16889 if (previous_prefix[0] != '\0')
16890 name = typename_concat (&objfile->objfile_obstack,
16891 previous_prefix, name, 0, cu);
16893 /* Create the type. */
16894 type = init_type (objfile, TYPE_CODE_NAMESPACE, 0, name);
16896 return set_die_type (die, type, cu);
16899 /* Read a namespace scope. */
16902 read_namespace (struct die_info *die, struct dwarf2_cu *cu)
16904 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
16907 /* Add a symbol associated to this if we haven't seen the namespace
16908 before. Also, add a using directive if it's an anonymous
16911 if (dwarf2_attr (die, DW_AT_extension, cu) == NULL)
16915 type = read_type_die (die, cu);
16916 new_symbol (die, type, cu);
16918 namespace_name (die, &is_anonymous, cu);
16921 const char *previous_prefix = determine_prefix (die, cu);
16923 std::vector<const char *> excludes;
16924 add_using_directive (using_directives (cu),
16925 previous_prefix, TYPE_NAME (type), NULL,
16926 NULL, excludes, 0, &objfile->objfile_obstack);
16930 if (die->child != NULL)
16932 struct die_info *child_die = die->child;
16934 while (child_die && child_die->tag)
16936 process_die (child_die, cu);
16937 child_die = sibling_die (child_die);
16942 /* Read a Fortran module as type. This DIE can be only a declaration used for
16943 imported module. Still we need that type as local Fortran "use ... only"
16944 declaration imports depend on the created type in determine_prefix. */
16946 static struct type *
16947 read_module_type (struct die_info *die, struct dwarf2_cu *cu)
16949 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
16950 const char *module_name;
16953 module_name = dwarf2_name (die, cu);
16955 complaint (_("DW_TAG_module has no name, offset %s"),
16956 sect_offset_str (die->sect_off));
16957 type = init_type (objfile, TYPE_CODE_MODULE, 0, module_name);
16959 return set_die_type (die, type, cu);
16962 /* Read a Fortran module. */
16965 read_module (struct die_info *die, struct dwarf2_cu *cu)
16967 struct die_info *child_die = die->child;
16970 type = read_type_die (die, cu);
16971 new_symbol (die, type, cu);
16973 while (child_die && child_die->tag)
16975 process_die (child_die, cu);
16976 child_die = sibling_die (child_die);
16980 /* Return the name of the namespace represented by DIE. Set
16981 *IS_ANONYMOUS to tell whether or not the namespace is an anonymous
16984 static const char *
16985 namespace_name (struct die_info *die, int *is_anonymous, struct dwarf2_cu *cu)
16987 struct die_info *current_die;
16988 const char *name = NULL;
16990 /* Loop through the extensions until we find a name. */
16992 for (current_die = die;
16993 current_die != NULL;
16994 current_die = dwarf2_extension (die, &cu))
16996 /* We don't use dwarf2_name here so that we can detect the absence
16997 of a name -> anonymous namespace. */
16998 name = dwarf2_string_attr (die, DW_AT_name, cu);
17004 /* Is it an anonymous namespace? */
17006 *is_anonymous = (name == NULL);
17008 name = CP_ANONYMOUS_NAMESPACE_STR;
17013 /* Extract all information from a DW_TAG_pointer_type DIE and add to
17014 the user defined type vector. */
17016 static struct type *
17017 read_tag_pointer_type (struct die_info *die, struct dwarf2_cu *cu)
17019 struct gdbarch *gdbarch
17020 = get_objfile_arch (cu->per_cu->dwarf2_per_objfile->objfile);
17021 struct comp_unit_head *cu_header = &cu->header;
17023 struct attribute *attr_byte_size;
17024 struct attribute *attr_address_class;
17025 int byte_size, addr_class;
17026 struct type *target_type;
17028 target_type = die_type (die, cu);
17030 /* The die_type call above may have already set the type for this DIE. */
17031 type = get_die_type (die, cu);
17035 type = lookup_pointer_type (target_type);
17037 attr_byte_size = dwarf2_attr (die, DW_AT_byte_size, cu);
17038 if (attr_byte_size)
17039 byte_size = DW_UNSND (attr_byte_size);
17041 byte_size = cu_header->addr_size;
17043 attr_address_class = dwarf2_attr (die, DW_AT_address_class, cu);
17044 if (attr_address_class)
17045 addr_class = DW_UNSND (attr_address_class);
17047 addr_class = DW_ADDR_none;
17049 ULONGEST alignment = get_alignment (cu, die);
17051 /* If the pointer size, alignment, or address class is different
17052 than the default, create a type variant marked as such and set
17053 the length accordingly. */
17054 if (TYPE_LENGTH (type) != byte_size
17055 || (alignment != 0 && TYPE_RAW_ALIGN (type) != 0
17056 && alignment != TYPE_RAW_ALIGN (type))
17057 || addr_class != DW_ADDR_none)
17059 if (gdbarch_address_class_type_flags_p (gdbarch))
17063 type_flags = gdbarch_address_class_type_flags
17064 (gdbarch, byte_size, addr_class);
17065 gdb_assert ((type_flags & ~TYPE_INSTANCE_FLAG_ADDRESS_CLASS_ALL)
17067 type = make_type_with_address_space (type, type_flags);
17069 else if (TYPE_LENGTH (type) != byte_size)
17071 complaint (_("invalid pointer size %d"), byte_size);
17073 else if (TYPE_RAW_ALIGN (type) != alignment)
17075 complaint (_("Invalid DW_AT_alignment"
17076 " - DIE at %s [in module %s]"),
17077 sect_offset_str (die->sect_off),
17078 objfile_name (cu->per_cu->dwarf2_per_objfile->objfile));
17082 /* Should we also complain about unhandled address classes? */
17086 TYPE_LENGTH (type) = byte_size;
17087 set_type_align (type, alignment);
17088 return set_die_type (die, type, cu);
17091 /* Extract all information from a DW_TAG_ptr_to_member_type DIE and add to
17092 the user defined type vector. */
17094 static struct type *
17095 read_tag_ptr_to_member_type (struct die_info *die, struct dwarf2_cu *cu)
17098 struct type *to_type;
17099 struct type *domain;
17101 to_type = die_type (die, cu);
17102 domain = die_containing_type (die, cu);
17104 /* The calls above may have already set the type for this DIE. */
17105 type = get_die_type (die, cu);
17109 if (TYPE_CODE (check_typedef (to_type)) == TYPE_CODE_METHOD)
17110 type = lookup_methodptr_type (to_type);
17111 else if (TYPE_CODE (check_typedef (to_type)) == TYPE_CODE_FUNC)
17113 struct type *new_type
17114 = alloc_type (cu->per_cu->dwarf2_per_objfile->objfile);
17116 smash_to_method_type (new_type, domain, TYPE_TARGET_TYPE (to_type),
17117 TYPE_FIELDS (to_type), TYPE_NFIELDS (to_type),
17118 TYPE_VARARGS (to_type));
17119 type = lookup_methodptr_type (new_type);
17122 type = lookup_memberptr_type (to_type, domain);
17124 return set_die_type (die, type, cu);
17127 /* Extract all information from a DW_TAG_{rvalue_,}reference_type DIE and add to
17128 the user defined type vector. */
17130 static struct type *
17131 read_tag_reference_type (struct die_info *die, struct dwarf2_cu *cu,
17132 enum type_code refcode)
17134 struct comp_unit_head *cu_header = &cu->header;
17135 struct type *type, *target_type;
17136 struct attribute *attr;
17138 gdb_assert (refcode == TYPE_CODE_REF || refcode == TYPE_CODE_RVALUE_REF);
17140 target_type = die_type (die, cu);
17142 /* The die_type call above may have already set the type for this DIE. */
17143 type = get_die_type (die, cu);
17147 type = lookup_reference_type (target_type, refcode);
17148 attr = dwarf2_attr (die, DW_AT_byte_size, cu);
17151 TYPE_LENGTH (type) = DW_UNSND (attr);
17155 TYPE_LENGTH (type) = cu_header->addr_size;
17157 maybe_set_alignment (cu, die, type);
17158 return set_die_type (die, type, cu);
17161 /* Add the given cv-qualifiers to the element type of the array. GCC
17162 outputs DWARF type qualifiers that apply to an array, not the
17163 element type. But GDB relies on the array element type to carry
17164 the cv-qualifiers. This mimics section 6.7.3 of the C99
17167 static struct type *
17168 add_array_cv_type (struct die_info *die, struct dwarf2_cu *cu,
17169 struct type *base_type, int cnst, int voltl)
17171 struct type *el_type, *inner_array;
17173 base_type = copy_type (base_type);
17174 inner_array = base_type;
17176 while (TYPE_CODE (TYPE_TARGET_TYPE (inner_array)) == TYPE_CODE_ARRAY)
17178 TYPE_TARGET_TYPE (inner_array) =
17179 copy_type (TYPE_TARGET_TYPE (inner_array));
17180 inner_array = TYPE_TARGET_TYPE (inner_array);
17183 el_type = TYPE_TARGET_TYPE (inner_array);
17184 cnst |= TYPE_CONST (el_type);
17185 voltl |= TYPE_VOLATILE (el_type);
17186 TYPE_TARGET_TYPE (inner_array) = make_cv_type (cnst, voltl, el_type, NULL);
17188 return set_die_type (die, base_type, cu);
17191 static struct type *
17192 read_tag_const_type (struct die_info *die, struct dwarf2_cu *cu)
17194 struct type *base_type, *cv_type;
17196 base_type = die_type (die, cu);
17198 /* The die_type call above may have already set the type for this DIE. */
17199 cv_type = get_die_type (die, cu);
17203 /* In case the const qualifier is applied to an array type, the element type
17204 is so qualified, not the array type (section 6.7.3 of C99). */
17205 if (TYPE_CODE (base_type) == TYPE_CODE_ARRAY)
17206 return add_array_cv_type (die, cu, base_type, 1, 0);
17208 cv_type = make_cv_type (1, TYPE_VOLATILE (base_type), base_type, 0);
17209 return set_die_type (die, cv_type, cu);
17212 static struct type *
17213 read_tag_volatile_type (struct die_info *die, struct dwarf2_cu *cu)
17215 struct type *base_type, *cv_type;
17217 base_type = die_type (die, cu);
17219 /* The die_type call above may have already set the type for this DIE. */
17220 cv_type = get_die_type (die, cu);
17224 /* In case the volatile qualifier is applied to an array type, the
17225 element type is so qualified, not the array type (section 6.7.3
17227 if (TYPE_CODE (base_type) == TYPE_CODE_ARRAY)
17228 return add_array_cv_type (die, cu, base_type, 0, 1);
17230 cv_type = make_cv_type (TYPE_CONST (base_type), 1, base_type, 0);
17231 return set_die_type (die, cv_type, cu);
17234 /* Handle DW_TAG_restrict_type. */
17236 static struct type *
17237 read_tag_restrict_type (struct die_info *die, struct dwarf2_cu *cu)
17239 struct type *base_type, *cv_type;
17241 base_type = die_type (die, cu);
17243 /* The die_type call above may have already set the type for this DIE. */
17244 cv_type = get_die_type (die, cu);
17248 cv_type = make_restrict_type (base_type);
17249 return set_die_type (die, cv_type, cu);
17252 /* Handle DW_TAG_atomic_type. */
17254 static struct type *
17255 read_tag_atomic_type (struct die_info *die, struct dwarf2_cu *cu)
17257 struct type *base_type, *cv_type;
17259 base_type = die_type (die, cu);
17261 /* The die_type call above may have already set the type for this DIE. */
17262 cv_type = get_die_type (die, cu);
17266 cv_type = make_atomic_type (base_type);
17267 return set_die_type (die, cv_type, cu);
17270 /* Extract all information from a DW_TAG_string_type DIE and add to
17271 the user defined type vector. It isn't really a user defined type,
17272 but it behaves like one, with other DIE's using an AT_user_def_type
17273 attribute to reference it. */
17275 static struct type *
17276 read_tag_string_type (struct die_info *die, struct dwarf2_cu *cu)
17278 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
17279 struct gdbarch *gdbarch = get_objfile_arch (objfile);
17280 struct type *type, *range_type, *index_type, *char_type;
17281 struct attribute *attr;
17282 unsigned int length;
17284 attr = dwarf2_attr (die, DW_AT_string_length, cu);
17287 length = DW_UNSND (attr);
17291 /* Check for the DW_AT_byte_size attribute. */
17292 attr = dwarf2_attr (die, DW_AT_byte_size, cu);
17295 length = DW_UNSND (attr);
17303 index_type = objfile_type (objfile)->builtin_int;
17304 range_type = create_static_range_type (NULL, index_type, 1, length);
17305 char_type = language_string_char_type (cu->language_defn, gdbarch);
17306 type = create_string_type (NULL, char_type, range_type);
17308 return set_die_type (die, type, cu);
17311 /* Assuming that DIE corresponds to a function, returns nonzero
17312 if the function is prototyped. */
17315 prototyped_function_p (struct die_info *die, struct dwarf2_cu *cu)
17317 struct attribute *attr;
17319 attr = dwarf2_attr (die, DW_AT_prototyped, cu);
17320 if (attr && (DW_UNSND (attr) != 0))
17323 /* The DWARF standard implies that the DW_AT_prototyped attribute
17324 is only meaninful for C, but the concept also extends to other
17325 languages that allow unprototyped functions (Eg: Objective C).
17326 For all other languages, assume that functions are always
17328 if (cu->language != language_c
17329 && cu->language != language_objc
17330 && cu->language != language_opencl)
17333 /* RealView does not emit DW_AT_prototyped. We can not distinguish
17334 prototyped and unprototyped functions; default to prototyped,
17335 since that is more common in modern code (and RealView warns
17336 about unprototyped functions). */
17337 if (producer_is_realview (cu->producer))
17343 /* Handle DIES due to C code like:
17347 int (*funcp)(int a, long l);
17351 ('funcp' generates a DW_TAG_subroutine_type DIE). */
17353 static struct type *
17354 read_subroutine_type (struct die_info *die, struct dwarf2_cu *cu)
17356 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
17357 struct type *type; /* Type that this function returns. */
17358 struct type *ftype; /* Function that returns above type. */
17359 struct attribute *attr;
17361 type = die_type (die, cu);
17363 /* The die_type call above may have already set the type for this DIE. */
17364 ftype = get_die_type (die, cu);
17368 ftype = lookup_function_type (type);
17370 if (prototyped_function_p (die, cu))
17371 TYPE_PROTOTYPED (ftype) = 1;
17373 /* Store the calling convention in the type if it's available in
17374 the subroutine die. Otherwise set the calling convention to
17375 the default value DW_CC_normal. */
17376 attr = dwarf2_attr (die, DW_AT_calling_convention, cu);
17378 TYPE_CALLING_CONVENTION (ftype) = DW_UNSND (attr);
17379 else if (cu->producer && strstr (cu->producer, "IBM XL C for OpenCL"))
17380 TYPE_CALLING_CONVENTION (ftype) = DW_CC_GDB_IBM_OpenCL;
17382 TYPE_CALLING_CONVENTION (ftype) = DW_CC_normal;
17384 /* Record whether the function returns normally to its caller or not
17385 if the DWARF producer set that information. */
17386 attr = dwarf2_attr (die, DW_AT_noreturn, cu);
17387 if (attr && (DW_UNSND (attr) != 0))
17388 TYPE_NO_RETURN (ftype) = 1;
17390 /* We need to add the subroutine type to the die immediately so
17391 we don't infinitely recurse when dealing with parameters
17392 declared as the same subroutine type. */
17393 set_die_type (die, ftype, cu);
17395 if (die->child != NULL)
17397 struct type *void_type = objfile_type (objfile)->builtin_void;
17398 struct die_info *child_die;
17399 int nparams, iparams;
17401 /* Count the number of parameters.
17402 FIXME: GDB currently ignores vararg functions, but knows about
17403 vararg member functions. */
17405 child_die = die->child;
17406 while (child_die && child_die->tag)
17408 if (child_die->tag == DW_TAG_formal_parameter)
17410 else if (child_die->tag == DW_TAG_unspecified_parameters)
17411 TYPE_VARARGS (ftype) = 1;
17412 child_die = sibling_die (child_die);
17415 /* Allocate storage for parameters and fill them in. */
17416 TYPE_NFIELDS (ftype) = nparams;
17417 TYPE_FIELDS (ftype) = (struct field *)
17418 TYPE_ZALLOC (ftype, nparams * sizeof (struct field));
17420 /* TYPE_FIELD_TYPE must never be NULL. Pre-fill the array to ensure it
17421 even if we error out during the parameters reading below. */
17422 for (iparams = 0; iparams < nparams; iparams++)
17423 TYPE_FIELD_TYPE (ftype, iparams) = void_type;
17426 child_die = die->child;
17427 while (child_die && child_die->tag)
17429 if (child_die->tag == DW_TAG_formal_parameter)
17431 struct type *arg_type;
17433 /* DWARF version 2 has no clean way to discern C++
17434 static and non-static member functions. G++ helps
17435 GDB by marking the first parameter for non-static
17436 member functions (which is the this pointer) as
17437 artificial. We pass this information to
17438 dwarf2_add_member_fn via TYPE_FIELD_ARTIFICIAL.
17440 DWARF version 3 added DW_AT_object_pointer, which GCC
17441 4.5 does not yet generate. */
17442 attr = dwarf2_attr (child_die, DW_AT_artificial, cu);
17444 TYPE_FIELD_ARTIFICIAL (ftype, iparams) = DW_UNSND (attr);
17446 TYPE_FIELD_ARTIFICIAL (ftype, iparams) = 0;
17447 arg_type = die_type (child_die, cu);
17449 /* RealView does not mark THIS as const, which the testsuite
17450 expects. GCC marks THIS as const in method definitions,
17451 but not in the class specifications (GCC PR 43053). */
17452 if (cu->language == language_cplus && !TYPE_CONST (arg_type)
17453 && TYPE_FIELD_ARTIFICIAL (ftype, iparams))
17456 struct dwarf2_cu *arg_cu = cu;
17457 const char *name = dwarf2_name (child_die, cu);
17459 attr = dwarf2_attr (die, DW_AT_object_pointer, cu);
17462 /* If the compiler emits this, use it. */
17463 if (follow_die_ref (die, attr, &arg_cu) == child_die)
17466 else if (name && strcmp (name, "this") == 0)
17467 /* Function definitions will have the argument names. */
17469 else if (name == NULL && iparams == 0)
17470 /* Declarations may not have the names, so like
17471 elsewhere in GDB, assume an artificial first
17472 argument is "this". */
17476 arg_type = make_cv_type (1, TYPE_VOLATILE (arg_type),
17480 TYPE_FIELD_TYPE (ftype, iparams) = arg_type;
17483 child_die = sibling_die (child_die);
17490 static struct type *
17491 read_typedef (struct die_info *die, struct dwarf2_cu *cu)
17493 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
17494 const char *name = NULL;
17495 struct type *this_type, *target_type;
17497 name = dwarf2_full_name (NULL, die, cu);
17498 this_type = init_type (objfile, TYPE_CODE_TYPEDEF, 0, name);
17499 TYPE_TARGET_STUB (this_type) = 1;
17500 set_die_type (die, this_type, cu);
17501 target_type = die_type (die, cu);
17502 if (target_type != this_type)
17503 TYPE_TARGET_TYPE (this_type) = target_type;
17506 /* Self-referential typedefs are, it seems, not allowed by the DWARF
17507 spec and cause infinite loops in GDB. */
17508 complaint (_("Self-referential DW_TAG_typedef "
17509 "- DIE at %s [in module %s]"),
17510 sect_offset_str (die->sect_off), objfile_name (objfile));
17511 TYPE_TARGET_TYPE (this_type) = NULL;
17516 /* Allocate a floating-point type of size BITS and name NAME. Pass NAME_HINT
17517 (which may be different from NAME) to the architecture back-end to allow
17518 it to guess the correct format if necessary. */
17520 static struct type *
17521 dwarf2_init_float_type (struct objfile *objfile, int bits, const char *name,
17522 const char *name_hint)
17524 struct gdbarch *gdbarch = get_objfile_arch (objfile);
17525 const struct floatformat **format;
17528 format = gdbarch_floatformat_for_type (gdbarch, name_hint, bits);
17530 type = init_float_type (objfile, bits, name, format);
17532 type = init_type (objfile, TYPE_CODE_ERROR, bits, name);
17537 /* Allocate an integer type of size BITS and name NAME. */
17539 static struct type *
17540 dwarf2_init_integer_type (struct dwarf2_cu *cu, struct objfile *objfile,
17541 int bits, int unsigned_p, const char *name)
17545 /* Versions of Intel's C Compiler generate an integer type called "void"
17546 instead of using DW_TAG_unspecified_type. This has been seen on
17547 at least versions 14, 17, and 18. */
17548 if (bits == 0 && producer_is_icc (cu) && name != nullptr
17549 && strcmp (name, "void") == 0)
17550 type = objfile_type (objfile)->builtin_void;
17552 type = init_integer_type (objfile, bits, unsigned_p, name);
17557 /* Initialise and return a floating point type of size BITS suitable for
17558 use as a component of a complex number. The NAME_HINT is passed through
17559 when initialising the floating point type and is the name of the complex
17562 As DWARF doesn't currently provide an explicit name for the components
17563 of a complex number, but it can be helpful to have these components
17564 named, we try to select a suitable name based on the size of the
17566 static struct type *
17567 dwarf2_init_complex_target_type (struct dwarf2_cu *cu,
17568 struct objfile *objfile,
17569 int bits, const char *name_hint)
17571 gdbarch *gdbarch = get_objfile_arch (objfile);
17572 struct type *tt = nullptr;
17574 /* Try to find a suitable floating point builtin type of size BITS.
17575 We're going to use the name of this type as the name for the complex
17576 target type that we are about to create. */
17577 switch (cu->language)
17579 case language_fortran:
17583 tt = builtin_f_type (gdbarch)->builtin_real;
17586 tt = builtin_f_type (gdbarch)->builtin_real_s8;
17588 case 96: /* The x86-32 ABI specifies 96-bit long double. */
17590 tt = builtin_f_type (gdbarch)->builtin_real_s16;
17598 tt = builtin_type (gdbarch)->builtin_float;
17601 tt = builtin_type (gdbarch)->builtin_double;
17603 case 96: /* The x86-32 ABI specifies 96-bit long double. */
17605 tt = builtin_type (gdbarch)->builtin_long_double;
17611 /* If the type we found doesn't match the size we were looking for, then
17612 pretend we didn't find a type at all, the complex target type we
17613 create will then be nameless. */
17614 if (tt != nullptr && TYPE_LENGTH (tt) * TARGET_CHAR_BIT != bits)
17617 const char *name = (tt == nullptr) ? nullptr : TYPE_NAME (tt);
17618 return dwarf2_init_float_type (objfile, bits, name, name_hint);
17621 /* Find a representation of a given base type and install
17622 it in the TYPE field of the die. */
17624 static struct type *
17625 read_base_type (struct die_info *die, struct dwarf2_cu *cu)
17627 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
17629 struct attribute *attr;
17630 int encoding = 0, bits = 0;
17633 attr = dwarf2_attr (die, DW_AT_encoding, cu);
17636 encoding = DW_UNSND (attr);
17638 attr = dwarf2_attr (die, DW_AT_byte_size, cu);
17641 bits = DW_UNSND (attr) * TARGET_CHAR_BIT;
17643 name = dwarf2_name (die, cu);
17646 complaint (_("DW_AT_name missing from DW_TAG_base_type"));
17651 case DW_ATE_address:
17652 /* Turn DW_ATE_address into a void * pointer. */
17653 type = init_type (objfile, TYPE_CODE_VOID, TARGET_CHAR_BIT, NULL);
17654 type = init_pointer_type (objfile, bits, name, type);
17656 case DW_ATE_boolean:
17657 type = init_boolean_type (objfile, bits, 1, name);
17659 case DW_ATE_complex_float:
17660 type = dwarf2_init_complex_target_type (cu, objfile, bits / 2, name);
17661 type = init_complex_type (objfile, name, type);
17663 case DW_ATE_decimal_float:
17664 type = init_decfloat_type (objfile, bits, name);
17667 type = dwarf2_init_float_type (objfile, bits, name, name);
17669 case DW_ATE_signed:
17670 type = dwarf2_init_integer_type (cu, objfile, bits, 0, name);
17672 case DW_ATE_unsigned:
17673 if (cu->language == language_fortran
17675 && startswith (name, "character("))
17676 type = init_character_type (objfile, bits, 1, name);
17678 type = dwarf2_init_integer_type (cu, objfile, bits, 1, name);
17680 case DW_ATE_signed_char:
17681 if (cu->language == language_ada || cu->language == language_m2
17682 || cu->language == language_pascal
17683 || cu->language == language_fortran)
17684 type = init_character_type (objfile, bits, 0, name);
17686 type = dwarf2_init_integer_type (cu, objfile, bits, 0, name);
17688 case DW_ATE_unsigned_char:
17689 if (cu->language == language_ada || cu->language == language_m2
17690 || cu->language == language_pascal
17691 || cu->language == language_fortran
17692 || cu->language == language_rust)
17693 type = init_character_type (objfile, bits, 1, name);
17695 type = dwarf2_init_integer_type (cu, objfile, bits, 1, name);
17699 gdbarch *arch = get_objfile_arch (objfile);
17702 type = builtin_type (arch)->builtin_char16;
17703 else if (bits == 32)
17704 type = builtin_type (arch)->builtin_char32;
17707 complaint (_("unsupported DW_ATE_UTF bit size: '%d'"),
17709 type = dwarf2_init_integer_type (cu, objfile, bits, 1, name);
17711 return set_die_type (die, type, cu);
17716 complaint (_("unsupported DW_AT_encoding: '%s'"),
17717 dwarf_type_encoding_name (encoding));
17718 type = init_type (objfile, TYPE_CODE_ERROR, bits, name);
17722 if (name && strcmp (name, "char") == 0)
17723 TYPE_NOSIGN (type) = 1;
17725 maybe_set_alignment (cu, die, type);
17727 return set_die_type (die, type, cu);
17730 /* Parse dwarf attribute if it's a block, reference or constant and put the
17731 resulting value of the attribute into struct bound_prop.
17732 Returns 1 if ATTR could be resolved into PROP, 0 otherwise. */
17735 attr_to_dynamic_prop (const struct attribute *attr, struct die_info *die,
17736 struct dwarf2_cu *cu, struct dynamic_prop *prop)
17738 struct dwarf2_property_baton *baton;
17739 struct obstack *obstack
17740 = &cu->per_cu->dwarf2_per_objfile->objfile->objfile_obstack;
17742 if (attr == NULL || prop == NULL)
17745 if (attr_form_is_block (attr))
17747 baton = XOBNEW (obstack, struct dwarf2_property_baton);
17748 baton->referenced_type = NULL;
17749 baton->locexpr.per_cu = cu->per_cu;
17750 baton->locexpr.size = DW_BLOCK (attr)->size;
17751 baton->locexpr.data = DW_BLOCK (attr)->data;
17752 prop->data.baton = baton;
17753 prop->kind = PROP_LOCEXPR;
17754 gdb_assert (prop->data.baton != NULL);
17756 else if (attr_form_is_ref (attr))
17758 struct dwarf2_cu *target_cu = cu;
17759 struct die_info *target_die;
17760 struct attribute *target_attr;
17762 target_die = follow_die_ref (die, attr, &target_cu);
17763 target_attr = dwarf2_attr (target_die, DW_AT_location, target_cu);
17764 if (target_attr == NULL)
17765 target_attr = dwarf2_attr (target_die, DW_AT_data_member_location,
17767 if (target_attr == NULL)
17770 switch (target_attr->name)
17772 case DW_AT_location:
17773 if (attr_form_is_section_offset (target_attr))
17775 baton = XOBNEW (obstack, struct dwarf2_property_baton);
17776 baton->referenced_type = die_type (target_die, target_cu);
17777 fill_in_loclist_baton (cu, &baton->loclist, target_attr);
17778 prop->data.baton = baton;
17779 prop->kind = PROP_LOCLIST;
17780 gdb_assert (prop->data.baton != NULL);
17782 else if (attr_form_is_block (target_attr))
17784 baton = XOBNEW (obstack, struct dwarf2_property_baton);
17785 baton->referenced_type = die_type (target_die, target_cu);
17786 baton->locexpr.per_cu = cu->per_cu;
17787 baton->locexpr.size = DW_BLOCK (target_attr)->size;
17788 baton->locexpr.data = DW_BLOCK (target_attr)->data;
17789 prop->data.baton = baton;
17790 prop->kind = PROP_LOCEXPR;
17791 gdb_assert (prop->data.baton != NULL);
17795 dwarf2_invalid_attrib_class_complaint ("DW_AT_location",
17796 "dynamic property");
17800 case DW_AT_data_member_location:
17804 if (!handle_data_member_location (target_die, target_cu,
17808 baton = XOBNEW (obstack, struct dwarf2_property_baton);
17809 baton->referenced_type = read_type_die (target_die->parent,
17811 baton->offset_info.offset = offset;
17812 baton->offset_info.type = die_type (target_die, target_cu);
17813 prop->data.baton = baton;
17814 prop->kind = PROP_ADDR_OFFSET;
17819 else if (attr_form_is_constant (attr))
17821 prop->data.const_val = dwarf2_get_attr_constant_value (attr, 0);
17822 prop->kind = PROP_CONST;
17826 dwarf2_invalid_attrib_class_complaint (dwarf_form_name (attr->form),
17827 dwarf2_name (die, cu));
17834 /* Read the given DW_AT_subrange DIE. */
17836 static struct type *
17837 read_subrange_type (struct die_info *die, struct dwarf2_cu *cu)
17839 struct type *base_type, *orig_base_type;
17840 struct type *range_type;
17841 struct attribute *attr;
17842 struct dynamic_prop low, high;
17843 int low_default_is_valid;
17844 int high_bound_is_count = 0;
17846 ULONGEST negative_mask;
17848 orig_base_type = die_type (die, cu);
17849 /* If ORIG_BASE_TYPE is a typedef, it will not be TYPE_UNSIGNED,
17850 whereas the real type might be. So, we use ORIG_BASE_TYPE when
17851 creating the range type, but we use the result of check_typedef
17852 when examining properties of the type. */
17853 base_type = check_typedef (orig_base_type);
17855 /* The die_type call above may have already set the type for this DIE. */
17856 range_type = get_die_type (die, cu);
17860 low.kind = PROP_CONST;
17861 high.kind = PROP_CONST;
17862 high.data.const_val = 0;
17864 /* Set LOW_DEFAULT_IS_VALID if current language and DWARF version allow
17865 omitting DW_AT_lower_bound. */
17866 switch (cu->language)
17869 case language_cplus:
17870 low.data.const_val = 0;
17871 low_default_is_valid = 1;
17873 case language_fortran:
17874 low.data.const_val = 1;
17875 low_default_is_valid = 1;
17878 case language_objc:
17879 case language_rust:
17880 low.data.const_val = 0;
17881 low_default_is_valid = (cu->header.version >= 4);
17885 case language_pascal:
17886 low.data.const_val = 1;
17887 low_default_is_valid = (cu->header.version >= 4);
17890 low.data.const_val = 0;
17891 low_default_is_valid = 0;
17895 attr = dwarf2_attr (die, DW_AT_lower_bound, cu);
17897 attr_to_dynamic_prop (attr, die, cu, &low);
17898 else if (!low_default_is_valid)
17899 complaint (_("Missing DW_AT_lower_bound "
17900 "- DIE at %s [in module %s]"),
17901 sect_offset_str (die->sect_off),
17902 objfile_name (cu->per_cu->dwarf2_per_objfile->objfile));
17904 struct attribute *attr_ub, *attr_count;
17905 attr = attr_ub = dwarf2_attr (die, DW_AT_upper_bound, cu);
17906 if (!attr_to_dynamic_prop (attr, die, cu, &high))
17908 attr = attr_count = dwarf2_attr (die, DW_AT_count, cu);
17909 if (attr_to_dynamic_prop (attr, die, cu, &high))
17911 /* If bounds are constant do the final calculation here. */
17912 if (low.kind == PROP_CONST && high.kind == PROP_CONST)
17913 high.data.const_val = low.data.const_val + high.data.const_val - 1;
17915 high_bound_is_count = 1;
17919 if (attr_ub != NULL)
17920 complaint (_("Unresolved DW_AT_upper_bound "
17921 "- DIE at %s [in module %s]"),
17922 sect_offset_str (die->sect_off),
17923 objfile_name (cu->per_cu->dwarf2_per_objfile->objfile));
17924 if (attr_count != NULL)
17925 complaint (_("Unresolved DW_AT_count "
17926 "- DIE at %s [in module %s]"),
17927 sect_offset_str (die->sect_off),
17928 objfile_name (cu->per_cu->dwarf2_per_objfile->objfile));
17933 /* Dwarf-2 specifications explicitly allows to create subrange types
17934 without specifying a base type.
17935 In that case, the base type must be set to the type of
17936 the lower bound, upper bound or count, in that order, if any of these
17937 three attributes references an object that has a type.
17938 If no base type is found, the Dwarf-2 specifications say that
17939 a signed integer type of size equal to the size of an address should
17941 For the following C code: `extern char gdb_int [];'
17942 GCC produces an empty range DIE.
17943 FIXME: muller/2010-05-28: Possible references to object for low bound,
17944 high bound or count are not yet handled by this code. */
17945 if (TYPE_CODE (base_type) == TYPE_CODE_VOID)
17947 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
17948 struct gdbarch *gdbarch = get_objfile_arch (objfile);
17949 int addr_size = gdbarch_addr_bit (gdbarch) /8;
17950 struct type *int_type = objfile_type (objfile)->builtin_int;
17952 /* Test "int", "long int", and "long long int" objfile types,
17953 and select the first one having a size above or equal to the
17954 architecture address size. */
17955 if (int_type && TYPE_LENGTH (int_type) >= addr_size)
17956 base_type = int_type;
17959 int_type = objfile_type (objfile)->builtin_long;
17960 if (int_type && TYPE_LENGTH (int_type) >= addr_size)
17961 base_type = int_type;
17964 int_type = objfile_type (objfile)->builtin_long_long;
17965 if (int_type && TYPE_LENGTH (int_type) >= addr_size)
17966 base_type = int_type;
17971 /* Normally, the DWARF producers are expected to use a signed
17972 constant form (Eg. DW_FORM_sdata) to express negative bounds.
17973 But this is unfortunately not always the case, as witnessed
17974 with GCC, for instance, where the ambiguous DW_FORM_dataN form
17975 is used instead. To work around that ambiguity, we treat
17976 the bounds as signed, and thus sign-extend their values, when
17977 the base type is signed. */
17979 -((ULONGEST) 1 << (TYPE_LENGTH (base_type) * TARGET_CHAR_BIT - 1));
17980 if (low.kind == PROP_CONST
17981 && !TYPE_UNSIGNED (base_type) && (low.data.const_val & negative_mask))
17982 low.data.const_val |= negative_mask;
17983 if (high.kind == PROP_CONST
17984 && !TYPE_UNSIGNED (base_type) && (high.data.const_val & negative_mask))
17985 high.data.const_val |= negative_mask;
17987 range_type = create_range_type (NULL, orig_base_type, &low, &high);
17989 if (high_bound_is_count)
17990 TYPE_RANGE_DATA (range_type)->flag_upper_bound_is_count = 1;
17992 /* Ada expects an empty array on no boundary attributes. */
17993 if (attr == NULL && cu->language != language_ada)
17994 TYPE_HIGH_BOUND_KIND (range_type) = PROP_UNDEFINED;
17996 name = dwarf2_name (die, cu);
17998 TYPE_NAME (range_type) = name;
18000 attr = dwarf2_attr (die, DW_AT_byte_size, cu);
18002 TYPE_LENGTH (range_type) = DW_UNSND (attr);
18004 maybe_set_alignment (cu, die, range_type);
18006 set_die_type (die, range_type, cu);
18008 /* set_die_type should be already done. */
18009 set_descriptive_type (range_type, die, cu);
18014 static struct type *
18015 read_unspecified_type (struct die_info *die, struct dwarf2_cu *cu)
18019 type = init_type (cu->per_cu->dwarf2_per_objfile->objfile, TYPE_CODE_VOID,0,
18021 TYPE_NAME (type) = dwarf2_name (die, cu);
18023 /* In Ada, an unspecified type is typically used when the description
18024 of the type is defered to a different unit. When encountering
18025 such a type, we treat it as a stub, and try to resolve it later on,
18027 if (cu->language == language_ada)
18028 TYPE_STUB (type) = 1;
18030 return set_die_type (die, type, cu);
18033 /* Read a single die and all its descendents. Set the die's sibling
18034 field to NULL; set other fields in the die correctly, and set all
18035 of the descendents' fields correctly. Set *NEW_INFO_PTR to the
18036 location of the info_ptr after reading all of those dies. PARENT
18037 is the parent of the die in question. */
18039 static struct die_info *
18040 read_die_and_children (const struct die_reader_specs *reader,
18041 const gdb_byte *info_ptr,
18042 const gdb_byte **new_info_ptr,
18043 struct die_info *parent)
18045 struct die_info *die;
18046 const gdb_byte *cur_ptr;
18049 cur_ptr = read_full_die_1 (reader, &die, info_ptr, &has_children, 0);
18052 *new_info_ptr = cur_ptr;
18055 store_in_ref_table (die, reader->cu);
18058 die->child = read_die_and_siblings_1 (reader, cur_ptr, new_info_ptr, die);
18062 *new_info_ptr = cur_ptr;
18065 die->sibling = NULL;
18066 die->parent = parent;
18070 /* Read a die, all of its descendents, and all of its siblings; set
18071 all of the fields of all of the dies correctly. Arguments are as
18072 in read_die_and_children. */
18074 static struct die_info *
18075 read_die_and_siblings_1 (const struct die_reader_specs *reader,
18076 const gdb_byte *info_ptr,
18077 const gdb_byte **new_info_ptr,
18078 struct die_info *parent)
18080 struct die_info *first_die, *last_sibling;
18081 const gdb_byte *cur_ptr;
18083 cur_ptr = info_ptr;
18084 first_die = last_sibling = NULL;
18088 struct die_info *die
18089 = read_die_and_children (reader, cur_ptr, &cur_ptr, parent);
18093 *new_info_ptr = cur_ptr;
18100 last_sibling->sibling = die;
18102 last_sibling = die;
18106 /* Read a die, all of its descendents, and all of its siblings; set
18107 all of the fields of all of the dies correctly. Arguments are as
18108 in read_die_and_children.
18109 This the main entry point for reading a DIE and all its children. */
18111 static struct die_info *
18112 read_die_and_siblings (const struct die_reader_specs *reader,
18113 const gdb_byte *info_ptr,
18114 const gdb_byte **new_info_ptr,
18115 struct die_info *parent)
18117 struct die_info *die = read_die_and_siblings_1 (reader, info_ptr,
18118 new_info_ptr, parent);
18120 if (dwarf_die_debug)
18122 fprintf_unfiltered (gdb_stdlog,
18123 "Read die from %s@0x%x of %s:\n",
18124 get_section_name (reader->die_section),
18125 (unsigned) (info_ptr - reader->die_section->buffer),
18126 bfd_get_filename (reader->abfd));
18127 dump_die (die, dwarf_die_debug);
18133 /* Read a die and all its attributes, leave space for NUM_EXTRA_ATTRS
18135 The caller is responsible for filling in the extra attributes
18136 and updating (*DIEP)->num_attrs.
18137 Set DIEP to point to a newly allocated die with its information,
18138 except for its child, sibling, and parent fields.
18139 Set HAS_CHILDREN to tell whether the die has children or not. */
18141 static const gdb_byte *
18142 read_full_die_1 (const struct die_reader_specs *reader,
18143 struct die_info **diep, const gdb_byte *info_ptr,
18144 int *has_children, int num_extra_attrs)
18146 unsigned int abbrev_number, bytes_read, i;
18147 struct abbrev_info *abbrev;
18148 struct die_info *die;
18149 struct dwarf2_cu *cu = reader->cu;
18150 bfd *abfd = reader->abfd;
18152 sect_offset sect_off = (sect_offset) (info_ptr - reader->buffer);
18153 abbrev_number = read_unsigned_leb128 (abfd, info_ptr, &bytes_read);
18154 info_ptr += bytes_read;
18155 if (!abbrev_number)
18162 abbrev = reader->abbrev_table->lookup_abbrev (abbrev_number);
18164 error (_("Dwarf Error: could not find abbrev number %d [in module %s]"),
18166 bfd_get_filename (abfd));
18168 die = dwarf_alloc_die (cu, abbrev->num_attrs + num_extra_attrs);
18169 die->sect_off = sect_off;
18170 die->tag = abbrev->tag;
18171 die->abbrev = abbrev_number;
18173 /* Make the result usable.
18174 The caller needs to update num_attrs after adding the extra
18176 die->num_attrs = abbrev->num_attrs;
18178 for (i = 0; i < abbrev->num_attrs; ++i)
18179 info_ptr = read_attribute (reader, &die->attrs[i], &abbrev->attrs[i],
18183 *has_children = abbrev->has_children;
18187 /* Read a die and all its attributes.
18188 Set DIEP to point to a newly allocated die with its information,
18189 except for its child, sibling, and parent fields.
18190 Set HAS_CHILDREN to tell whether the die has children or not. */
18192 static const gdb_byte *
18193 read_full_die (const struct die_reader_specs *reader,
18194 struct die_info **diep, const gdb_byte *info_ptr,
18197 const gdb_byte *result;
18199 result = read_full_die_1 (reader, diep, info_ptr, has_children, 0);
18201 if (dwarf_die_debug)
18203 fprintf_unfiltered (gdb_stdlog,
18204 "Read die from %s@0x%x of %s:\n",
18205 get_section_name (reader->die_section),
18206 (unsigned) (info_ptr - reader->die_section->buffer),
18207 bfd_get_filename (reader->abfd));
18208 dump_die (*diep, dwarf_die_debug);
18214 /* Abbreviation tables.
18216 In DWARF version 2, the description of the debugging information is
18217 stored in a separate .debug_abbrev section. Before we read any
18218 dies from a section we read in all abbreviations and install them
18219 in a hash table. */
18221 /* Allocate space for a struct abbrev_info object in ABBREV_TABLE. */
18223 struct abbrev_info *
18224 abbrev_table::alloc_abbrev ()
18226 struct abbrev_info *abbrev;
18228 abbrev = XOBNEW (&abbrev_obstack, struct abbrev_info);
18229 memset (abbrev, 0, sizeof (struct abbrev_info));
18234 /* Add an abbreviation to the table. */
18237 abbrev_table::add_abbrev (unsigned int abbrev_number,
18238 struct abbrev_info *abbrev)
18240 unsigned int hash_number;
18242 hash_number = abbrev_number % ABBREV_HASH_SIZE;
18243 abbrev->next = m_abbrevs[hash_number];
18244 m_abbrevs[hash_number] = abbrev;
18247 /* Look up an abbrev in the table.
18248 Returns NULL if the abbrev is not found. */
18250 struct abbrev_info *
18251 abbrev_table::lookup_abbrev (unsigned int abbrev_number)
18253 unsigned int hash_number;
18254 struct abbrev_info *abbrev;
18256 hash_number = abbrev_number % ABBREV_HASH_SIZE;
18257 abbrev = m_abbrevs[hash_number];
18261 if (abbrev->number == abbrev_number)
18263 abbrev = abbrev->next;
18268 /* Read in an abbrev table. */
18270 static abbrev_table_up
18271 abbrev_table_read_table (struct dwarf2_per_objfile *dwarf2_per_objfile,
18272 struct dwarf2_section_info *section,
18273 sect_offset sect_off)
18275 struct objfile *objfile = dwarf2_per_objfile->objfile;
18276 bfd *abfd = get_section_bfd_owner (section);
18277 const gdb_byte *abbrev_ptr;
18278 struct abbrev_info *cur_abbrev;
18279 unsigned int abbrev_number, bytes_read, abbrev_name;
18280 unsigned int abbrev_form;
18281 struct attr_abbrev *cur_attrs;
18282 unsigned int allocated_attrs;
18284 abbrev_table_up abbrev_table (new struct abbrev_table (sect_off));
18286 dwarf2_read_section (objfile, section);
18287 abbrev_ptr = section->buffer + to_underlying (sect_off);
18288 abbrev_number = read_unsigned_leb128 (abfd, abbrev_ptr, &bytes_read);
18289 abbrev_ptr += bytes_read;
18291 allocated_attrs = ATTR_ALLOC_CHUNK;
18292 cur_attrs = XNEWVEC (struct attr_abbrev, allocated_attrs);
18294 /* Loop until we reach an abbrev number of 0. */
18295 while (abbrev_number)
18297 cur_abbrev = abbrev_table->alloc_abbrev ();
18299 /* read in abbrev header */
18300 cur_abbrev->number = abbrev_number;
18302 = (enum dwarf_tag) read_unsigned_leb128 (abfd, abbrev_ptr, &bytes_read);
18303 abbrev_ptr += bytes_read;
18304 cur_abbrev->has_children = read_1_byte (abfd, abbrev_ptr);
18307 /* now read in declarations */
18310 LONGEST implicit_const;
18312 abbrev_name = read_unsigned_leb128 (abfd, abbrev_ptr, &bytes_read);
18313 abbrev_ptr += bytes_read;
18314 abbrev_form = read_unsigned_leb128 (abfd, abbrev_ptr, &bytes_read);
18315 abbrev_ptr += bytes_read;
18316 if (abbrev_form == DW_FORM_implicit_const)
18318 implicit_const = read_signed_leb128 (abfd, abbrev_ptr,
18320 abbrev_ptr += bytes_read;
18324 /* Initialize it due to a false compiler warning. */
18325 implicit_const = -1;
18328 if (abbrev_name == 0)
18331 if (cur_abbrev->num_attrs == allocated_attrs)
18333 allocated_attrs += ATTR_ALLOC_CHUNK;
18335 = XRESIZEVEC (struct attr_abbrev, cur_attrs, allocated_attrs);
18338 cur_attrs[cur_abbrev->num_attrs].name
18339 = (enum dwarf_attribute) abbrev_name;
18340 cur_attrs[cur_abbrev->num_attrs].form
18341 = (enum dwarf_form) abbrev_form;
18342 cur_attrs[cur_abbrev->num_attrs].implicit_const = implicit_const;
18343 ++cur_abbrev->num_attrs;
18346 cur_abbrev->attrs =
18347 XOBNEWVEC (&abbrev_table->abbrev_obstack, struct attr_abbrev,
18348 cur_abbrev->num_attrs);
18349 memcpy (cur_abbrev->attrs, cur_attrs,
18350 cur_abbrev->num_attrs * sizeof (struct attr_abbrev));
18352 abbrev_table->add_abbrev (abbrev_number, cur_abbrev);
18354 /* Get next abbreviation.
18355 Under Irix6 the abbreviations for a compilation unit are not
18356 always properly terminated with an abbrev number of 0.
18357 Exit loop if we encounter an abbreviation which we have
18358 already read (which means we are about to read the abbreviations
18359 for the next compile unit) or if the end of the abbreviation
18360 table is reached. */
18361 if ((unsigned int) (abbrev_ptr - section->buffer) >= section->size)
18363 abbrev_number = read_unsigned_leb128 (abfd, abbrev_ptr, &bytes_read);
18364 abbrev_ptr += bytes_read;
18365 if (abbrev_table->lookup_abbrev (abbrev_number) != NULL)
18370 return abbrev_table;
18373 /* Returns nonzero if TAG represents a type that we might generate a partial
18377 is_type_tag_for_partial (int tag)
18382 /* Some types that would be reasonable to generate partial symbols for,
18383 that we don't at present. */
18384 case DW_TAG_array_type:
18385 case DW_TAG_file_type:
18386 case DW_TAG_ptr_to_member_type:
18387 case DW_TAG_set_type:
18388 case DW_TAG_string_type:
18389 case DW_TAG_subroutine_type:
18391 case DW_TAG_base_type:
18392 case DW_TAG_class_type:
18393 case DW_TAG_interface_type:
18394 case DW_TAG_enumeration_type:
18395 case DW_TAG_structure_type:
18396 case DW_TAG_subrange_type:
18397 case DW_TAG_typedef:
18398 case DW_TAG_union_type:
18405 /* Load all DIEs that are interesting for partial symbols into memory. */
18407 static struct partial_die_info *
18408 load_partial_dies (const struct die_reader_specs *reader,
18409 const gdb_byte *info_ptr, int building_psymtab)
18411 struct dwarf2_cu *cu = reader->cu;
18412 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
18413 struct partial_die_info *parent_die, *last_die, *first_die = NULL;
18414 unsigned int bytes_read;
18415 unsigned int load_all = 0;
18416 int nesting_level = 1;
18421 gdb_assert (cu->per_cu != NULL);
18422 if (cu->per_cu->load_all_dies)
18426 = htab_create_alloc_ex (cu->header.length / 12,
18430 &cu->comp_unit_obstack,
18431 hashtab_obstack_allocate,
18432 dummy_obstack_deallocate);
18436 abbrev_info *abbrev = peek_die_abbrev (*reader, info_ptr, &bytes_read);
18438 /* A NULL abbrev means the end of a series of children. */
18439 if (abbrev == NULL)
18441 if (--nesting_level == 0)
18444 info_ptr += bytes_read;
18445 last_die = parent_die;
18446 parent_die = parent_die->die_parent;
18450 /* Check for template arguments. We never save these; if
18451 they're seen, we just mark the parent, and go on our way. */
18452 if (parent_die != NULL
18453 && cu->language == language_cplus
18454 && (abbrev->tag == DW_TAG_template_type_param
18455 || abbrev->tag == DW_TAG_template_value_param))
18457 parent_die->has_template_arguments = 1;
18461 /* We don't need a partial DIE for the template argument. */
18462 info_ptr = skip_one_die (reader, info_ptr + bytes_read, abbrev);
18467 /* We only recurse into c++ subprograms looking for template arguments.
18468 Skip their other children. */
18470 && cu->language == language_cplus
18471 && parent_die != NULL
18472 && parent_die->tag == DW_TAG_subprogram)
18474 info_ptr = skip_one_die (reader, info_ptr + bytes_read, abbrev);
18478 /* Check whether this DIE is interesting enough to save. Normally
18479 we would not be interested in members here, but there may be
18480 later variables referencing them via DW_AT_specification (for
18481 static members). */
18483 && !is_type_tag_for_partial (abbrev->tag)
18484 && abbrev->tag != DW_TAG_constant
18485 && abbrev->tag != DW_TAG_enumerator
18486 && abbrev->tag != DW_TAG_subprogram
18487 && abbrev->tag != DW_TAG_inlined_subroutine
18488 && abbrev->tag != DW_TAG_lexical_block
18489 && abbrev->tag != DW_TAG_variable
18490 && abbrev->tag != DW_TAG_namespace
18491 && abbrev->tag != DW_TAG_module
18492 && abbrev->tag != DW_TAG_member
18493 && abbrev->tag != DW_TAG_imported_unit
18494 && abbrev->tag != DW_TAG_imported_declaration)
18496 /* Otherwise we skip to the next sibling, if any. */
18497 info_ptr = skip_one_die (reader, info_ptr + bytes_read, abbrev);
18501 struct partial_die_info pdi ((sect_offset) (info_ptr - reader->buffer),
18504 info_ptr = pdi.read (reader, *abbrev, info_ptr + bytes_read);
18506 /* This two-pass algorithm for processing partial symbols has a
18507 high cost in cache pressure. Thus, handle some simple cases
18508 here which cover the majority of C partial symbols. DIEs
18509 which neither have specification tags in them, nor could have
18510 specification tags elsewhere pointing at them, can simply be
18511 processed and discarded.
18513 This segment is also optional; scan_partial_symbols and
18514 add_partial_symbol will handle these DIEs if we chain
18515 them in normally. When compilers which do not emit large
18516 quantities of duplicate debug information are more common,
18517 this code can probably be removed. */
18519 /* Any complete simple types at the top level (pretty much all
18520 of them, for a language without namespaces), can be processed
18522 if (parent_die == NULL
18523 && pdi.has_specification == 0
18524 && pdi.is_declaration == 0
18525 && ((pdi.tag == DW_TAG_typedef && !pdi.has_children)
18526 || pdi.tag == DW_TAG_base_type
18527 || pdi.tag == DW_TAG_subrange_type))
18529 if (building_psymtab && pdi.name != NULL)
18530 add_psymbol_to_list (pdi.name, strlen (pdi.name), 0,
18531 VAR_DOMAIN, LOC_TYPEDEF, -1,
18532 psymbol_placement::STATIC,
18533 0, cu->language, objfile);
18534 info_ptr = locate_pdi_sibling (reader, &pdi, info_ptr);
18538 /* The exception for DW_TAG_typedef with has_children above is
18539 a workaround of GCC PR debug/47510. In the case of this complaint
18540 type_name_or_error will error on such types later.
18542 GDB skipped children of DW_TAG_typedef by the shortcut above and then
18543 it could not find the child DIEs referenced later, this is checked
18544 above. In correct DWARF DW_TAG_typedef should have no children. */
18546 if (pdi.tag == DW_TAG_typedef && pdi.has_children)
18547 complaint (_("DW_TAG_typedef has childen - GCC PR debug/47510 bug "
18548 "- DIE at %s [in module %s]"),
18549 sect_offset_str (pdi.sect_off), objfile_name (objfile));
18551 /* If we're at the second level, and we're an enumerator, and
18552 our parent has no specification (meaning possibly lives in a
18553 namespace elsewhere), then we can add the partial symbol now
18554 instead of queueing it. */
18555 if (pdi.tag == DW_TAG_enumerator
18556 && parent_die != NULL
18557 && parent_die->die_parent == NULL
18558 && parent_die->tag == DW_TAG_enumeration_type
18559 && parent_die->has_specification == 0)
18561 if (pdi.name == NULL)
18562 complaint (_("malformed enumerator DIE ignored"));
18563 else if (building_psymtab)
18564 add_psymbol_to_list (pdi.name, strlen (pdi.name), 0,
18565 VAR_DOMAIN, LOC_CONST, -1,
18566 cu->language == language_cplus
18567 ? psymbol_placement::GLOBAL
18568 : psymbol_placement::STATIC,
18569 0, cu->language, objfile);
18571 info_ptr = locate_pdi_sibling (reader, &pdi, info_ptr);
18575 struct partial_die_info *part_die
18576 = new (&cu->comp_unit_obstack) partial_die_info (pdi);
18578 /* We'll save this DIE so link it in. */
18579 part_die->die_parent = parent_die;
18580 part_die->die_sibling = NULL;
18581 part_die->die_child = NULL;
18583 if (last_die && last_die == parent_die)
18584 last_die->die_child = part_die;
18586 last_die->die_sibling = part_die;
18588 last_die = part_die;
18590 if (first_die == NULL)
18591 first_die = part_die;
18593 /* Maybe add the DIE to the hash table. Not all DIEs that we
18594 find interesting need to be in the hash table, because we
18595 also have the parent/sibling/child chains; only those that we
18596 might refer to by offset later during partial symbol reading.
18598 For now this means things that might have be the target of a
18599 DW_AT_specification, DW_AT_abstract_origin, or
18600 DW_AT_extension. DW_AT_extension will refer only to
18601 namespaces; DW_AT_abstract_origin refers to functions (and
18602 many things under the function DIE, but we do not recurse
18603 into function DIEs during partial symbol reading) and
18604 possibly variables as well; DW_AT_specification refers to
18605 declarations. Declarations ought to have the DW_AT_declaration
18606 flag. It happens that GCC forgets to put it in sometimes, but
18607 only for functions, not for types.
18609 Adding more things than necessary to the hash table is harmless
18610 except for the performance cost. Adding too few will result in
18611 wasted time in find_partial_die, when we reread the compilation
18612 unit with load_all_dies set. */
18615 || abbrev->tag == DW_TAG_constant
18616 || abbrev->tag == DW_TAG_subprogram
18617 || abbrev->tag == DW_TAG_variable
18618 || abbrev->tag == DW_TAG_namespace
18619 || part_die->is_declaration)
18623 slot = htab_find_slot_with_hash (cu->partial_dies, part_die,
18624 to_underlying (part_die->sect_off),
18629 /* For some DIEs we want to follow their children (if any). For C
18630 we have no reason to follow the children of structures; for other
18631 languages we have to, so that we can get at method physnames
18632 to infer fully qualified class names, for DW_AT_specification,
18633 and for C++ template arguments. For C++, we also look one level
18634 inside functions to find template arguments (if the name of the
18635 function does not already contain the template arguments).
18637 For Ada, we need to scan the children of subprograms and lexical
18638 blocks as well because Ada allows the definition of nested
18639 entities that could be interesting for the debugger, such as
18640 nested subprograms for instance. */
18641 if (last_die->has_children
18643 || last_die->tag == DW_TAG_namespace
18644 || last_die->tag == DW_TAG_module
18645 || last_die->tag == DW_TAG_enumeration_type
18646 || (cu->language == language_cplus
18647 && last_die->tag == DW_TAG_subprogram
18648 && (last_die->name == NULL
18649 || strchr (last_die->name, '<') == NULL))
18650 || (cu->language != language_c
18651 && (last_die->tag == DW_TAG_class_type
18652 || last_die->tag == DW_TAG_interface_type
18653 || last_die->tag == DW_TAG_structure_type
18654 || last_die->tag == DW_TAG_union_type))
18655 || (cu->language == language_ada
18656 && (last_die->tag == DW_TAG_subprogram
18657 || last_die->tag == DW_TAG_lexical_block))))
18660 parent_die = last_die;
18664 /* Otherwise we skip to the next sibling, if any. */
18665 info_ptr = locate_pdi_sibling (reader, last_die, info_ptr);
18667 /* Back to the top, do it again. */
18671 partial_die_info::partial_die_info (sect_offset sect_off_,
18672 struct abbrev_info *abbrev)
18673 : partial_die_info (sect_off_, abbrev->tag, abbrev->has_children)
18677 /* Read a minimal amount of information into the minimal die structure.
18678 INFO_PTR should point just after the initial uleb128 of a DIE. */
18681 partial_die_info::read (const struct die_reader_specs *reader,
18682 const struct abbrev_info &abbrev, const gdb_byte *info_ptr)
18684 struct dwarf2_cu *cu = reader->cu;
18685 struct dwarf2_per_objfile *dwarf2_per_objfile
18686 = cu->per_cu->dwarf2_per_objfile;
18688 int has_low_pc_attr = 0;
18689 int has_high_pc_attr = 0;
18690 int high_pc_relative = 0;
18692 for (i = 0; i < abbrev.num_attrs; ++i)
18694 struct attribute attr;
18696 info_ptr = read_attribute (reader, &attr, &abbrev.attrs[i], info_ptr);
18698 /* Store the data if it is of an attribute we want to keep in a
18699 partial symbol table. */
18705 case DW_TAG_compile_unit:
18706 case DW_TAG_partial_unit:
18707 case DW_TAG_type_unit:
18708 /* Compilation units have a DW_AT_name that is a filename, not
18709 a source language identifier. */
18710 case DW_TAG_enumeration_type:
18711 case DW_TAG_enumerator:
18712 /* These tags always have simple identifiers already; no need
18713 to canonicalize them. */
18714 name = DW_STRING (&attr);
18718 struct objfile *objfile = dwarf2_per_objfile->objfile;
18721 = dwarf2_canonicalize_name (DW_STRING (&attr), cu,
18722 &objfile->per_bfd->storage_obstack);
18727 case DW_AT_linkage_name:
18728 case DW_AT_MIPS_linkage_name:
18729 /* Note that both forms of linkage name might appear. We
18730 assume they will be the same, and we only store the last
18732 if (cu->language == language_ada)
18733 name = DW_STRING (&attr);
18734 linkage_name = DW_STRING (&attr);
18737 has_low_pc_attr = 1;
18738 lowpc = attr_value_as_address (&attr);
18740 case DW_AT_high_pc:
18741 has_high_pc_attr = 1;
18742 highpc = attr_value_as_address (&attr);
18743 if (cu->header.version >= 4 && attr_form_is_constant (&attr))
18744 high_pc_relative = 1;
18746 case DW_AT_location:
18747 /* Support the .debug_loc offsets. */
18748 if (attr_form_is_block (&attr))
18750 d.locdesc = DW_BLOCK (&attr);
18752 else if (attr_form_is_section_offset (&attr))
18754 dwarf2_complex_location_expr_complaint ();
18758 dwarf2_invalid_attrib_class_complaint ("DW_AT_location",
18759 "partial symbol information");
18762 case DW_AT_external:
18763 is_external = DW_UNSND (&attr);
18765 case DW_AT_declaration:
18766 is_declaration = DW_UNSND (&attr);
18771 case DW_AT_abstract_origin:
18772 case DW_AT_specification:
18773 case DW_AT_extension:
18774 has_specification = 1;
18775 spec_offset = dwarf2_get_ref_die_offset (&attr);
18776 spec_is_dwz = (attr.form == DW_FORM_GNU_ref_alt
18777 || cu->per_cu->is_dwz);
18779 case DW_AT_sibling:
18780 /* Ignore absolute siblings, they might point outside of
18781 the current compile unit. */
18782 if (attr.form == DW_FORM_ref_addr)
18783 complaint (_("ignoring absolute DW_AT_sibling"));
18786 const gdb_byte *buffer = reader->buffer;
18787 sect_offset off = dwarf2_get_ref_die_offset (&attr);
18788 const gdb_byte *sibling_ptr = buffer + to_underlying (off);
18790 if (sibling_ptr < info_ptr)
18791 complaint (_("DW_AT_sibling points backwards"));
18792 else if (sibling_ptr > reader->buffer_end)
18793 dwarf2_section_buffer_overflow_complaint (reader->die_section);
18795 sibling = sibling_ptr;
18798 case DW_AT_byte_size:
18801 case DW_AT_const_value:
18802 has_const_value = 1;
18804 case DW_AT_calling_convention:
18805 /* DWARF doesn't provide a way to identify a program's source-level
18806 entry point. DW_AT_calling_convention attributes are only meant
18807 to describe functions' calling conventions.
18809 However, because it's a necessary piece of information in
18810 Fortran, and before DWARF 4 DW_CC_program was the only
18811 piece of debugging information whose definition refers to
18812 a 'main program' at all, several compilers marked Fortran
18813 main programs with DW_CC_program --- even when those
18814 functions use the standard calling conventions.
18816 Although DWARF now specifies a way to provide this
18817 information, we support this practice for backward
18819 if (DW_UNSND (&attr) == DW_CC_program
18820 && cu->language == language_fortran)
18821 main_subprogram = 1;
18824 if (DW_UNSND (&attr) == DW_INL_inlined
18825 || DW_UNSND (&attr) == DW_INL_declared_inlined)
18826 may_be_inlined = 1;
18830 if (tag == DW_TAG_imported_unit)
18832 d.sect_off = dwarf2_get_ref_die_offset (&attr);
18833 is_dwz = (attr.form == DW_FORM_GNU_ref_alt
18834 || cu->per_cu->is_dwz);
18838 case DW_AT_main_subprogram:
18839 main_subprogram = DW_UNSND (&attr);
18844 /* It would be nice to reuse dwarf2_get_pc_bounds here,
18845 but that requires a full DIE, so instead we just
18847 int need_ranges_base = tag != DW_TAG_compile_unit;
18848 unsigned int ranges_offset = (DW_UNSND (&attr)
18849 + (need_ranges_base
18853 /* Value of the DW_AT_ranges attribute is the offset in the
18854 .debug_ranges section. */
18855 if (dwarf2_ranges_read (ranges_offset, &lowpc, &highpc, cu,
18866 if (high_pc_relative)
18869 if (has_low_pc_attr && has_high_pc_attr)
18871 /* When using the GNU linker, .gnu.linkonce. sections are used to
18872 eliminate duplicate copies of functions and vtables and such.
18873 The linker will arbitrarily choose one and discard the others.
18874 The AT_*_pc values for such functions refer to local labels in
18875 these sections. If the section from that file was discarded, the
18876 labels are not in the output, so the relocs get a value of 0.
18877 If this is a discarded function, mark the pc bounds as invalid,
18878 so that GDB will ignore it. */
18879 if (lowpc == 0 && !dwarf2_per_objfile->has_section_at_zero)
18881 struct objfile *objfile = dwarf2_per_objfile->objfile;
18882 struct gdbarch *gdbarch = get_objfile_arch (objfile);
18884 complaint (_("DW_AT_low_pc %s is zero "
18885 "for DIE at %s [in module %s]"),
18886 paddress (gdbarch, lowpc),
18887 sect_offset_str (sect_off),
18888 objfile_name (objfile));
18890 /* dwarf2_get_pc_bounds has also the strict low < high requirement. */
18891 else if (lowpc >= highpc)
18893 struct objfile *objfile = dwarf2_per_objfile->objfile;
18894 struct gdbarch *gdbarch = get_objfile_arch (objfile);
18896 complaint (_("DW_AT_low_pc %s is not < DW_AT_high_pc %s "
18897 "for DIE at %s [in module %s]"),
18898 paddress (gdbarch, lowpc),
18899 paddress (gdbarch, highpc),
18900 sect_offset_str (sect_off),
18901 objfile_name (objfile));
18910 /* Find a cached partial DIE at OFFSET in CU. */
18912 struct partial_die_info *
18913 dwarf2_cu::find_partial_die (sect_offset sect_off)
18915 struct partial_die_info *lookup_die = NULL;
18916 struct partial_die_info part_die (sect_off);
18918 lookup_die = ((struct partial_die_info *)
18919 htab_find_with_hash (partial_dies, &part_die,
18920 to_underlying (sect_off)));
18925 /* Find a partial DIE at OFFSET, which may or may not be in CU,
18926 except in the case of .debug_types DIEs which do not reference
18927 outside their CU (they do however referencing other types via
18928 DW_FORM_ref_sig8). */
18930 static const struct cu_partial_die_info
18931 find_partial_die (sect_offset sect_off, int offset_in_dwz, struct dwarf2_cu *cu)
18933 struct dwarf2_per_objfile *dwarf2_per_objfile
18934 = cu->per_cu->dwarf2_per_objfile;
18935 struct objfile *objfile = dwarf2_per_objfile->objfile;
18936 struct dwarf2_per_cu_data *per_cu = NULL;
18937 struct partial_die_info *pd = NULL;
18939 if (offset_in_dwz == cu->per_cu->is_dwz
18940 && offset_in_cu_p (&cu->header, sect_off))
18942 pd = cu->find_partial_die (sect_off);
18945 /* We missed recording what we needed.
18946 Load all dies and try again. */
18947 per_cu = cu->per_cu;
18951 /* TUs don't reference other CUs/TUs (except via type signatures). */
18952 if (cu->per_cu->is_debug_types)
18954 error (_("Dwarf Error: Type Unit at offset %s contains"
18955 " external reference to offset %s [in module %s].\n"),
18956 sect_offset_str (cu->header.sect_off), sect_offset_str (sect_off),
18957 bfd_get_filename (objfile->obfd));
18959 per_cu = dwarf2_find_containing_comp_unit (sect_off, offset_in_dwz,
18960 dwarf2_per_objfile);
18962 if (per_cu->cu == NULL || per_cu->cu->partial_dies == NULL)
18963 load_partial_comp_unit (per_cu);
18965 per_cu->cu->last_used = 0;
18966 pd = per_cu->cu->find_partial_die (sect_off);
18969 /* If we didn't find it, and not all dies have been loaded,
18970 load them all and try again. */
18972 if (pd == NULL && per_cu->load_all_dies == 0)
18974 per_cu->load_all_dies = 1;
18976 /* This is nasty. When we reread the DIEs, somewhere up the call chain
18977 THIS_CU->cu may already be in use. So we can't just free it and
18978 replace its DIEs with the ones we read in. Instead, we leave those
18979 DIEs alone (which can still be in use, e.g. in scan_partial_symbols),
18980 and clobber THIS_CU->cu->partial_dies with the hash table for the new
18982 load_partial_comp_unit (per_cu);
18984 pd = per_cu->cu->find_partial_die (sect_off);
18988 internal_error (__FILE__, __LINE__,
18989 _("could not find partial DIE %s "
18990 "in cache [from module %s]\n"),
18991 sect_offset_str (sect_off), bfd_get_filename (objfile->obfd));
18992 return { per_cu->cu, pd };
18995 /* See if we can figure out if the class lives in a namespace. We do
18996 this by looking for a member function; its demangled name will
18997 contain namespace info, if there is any. */
19000 guess_partial_die_structure_name (struct partial_die_info *struct_pdi,
19001 struct dwarf2_cu *cu)
19003 /* NOTE: carlton/2003-10-07: Getting the info this way changes
19004 what template types look like, because the demangler
19005 frequently doesn't give the same name as the debug info. We
19006 could fix this by only using the demangled name to get the
19007 prefix (but see comment in read_structure_type). */
19009 struct partial_die_info *real_pdi;
19010 struct partial_die_info *child_pdi;
19012 /* If this DIE (this DIE's specification, if any) has a parent, then
19013 we should not do this. We'll prepend the parent's fully qualified
19014 name when we create the partial symbol. */
19016 real_pdi = struct_pdi;
19017 while (real_pdi->has_specification)
19019 auto res = find_partial_die (real_pdi->spec_offset,
19020 real_pdi->spec_is_dwz, cu);
19021 real_pdi = res.pdi;
19025 if (real_pdi->die_parent != NULL)
19028 for (child_pdi = struct_pdi->die_child;
19030 child_pdi = child_pdi->die_sibling)
19032 if (child_pdi->tag == DW_TAG_subprogram
19033 && child_pdi->linkage_name != NULL)
19035 char *actual_class_name
19036 = language_class_name_from_physname (cu->language_defn,
19037 child_pdi->linkage_name);
19038 if (actual_class_name != NULL)
19040 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
19043 obstack_copy0 (&objfile->per_bfd->storage_obstack,
19045 strlen (actual_class_name)));
19046 xfree (actual_class_name);
19054 partial_die_info::fixup (struct dwarf2_cu *cu)
19056 /* Once we've fixed up a die, there's no point in doing so again.
19057 This also avoids a memory leak if we were to call
19058 guess_partial_die_structure_name multiple times. */
19062 /* If we found a reference attribute and the DIE has no name, try
19063 to find a name in the referred to DIE. */
19065 if (name == NULL && has_specification)
19067 struct partial_die_info *spec_die;
19069 auto res = find_partial_die (spec_offset, spec_is_dwz, cu);
19070 spec_die = res.pdi;
19073 spec_die->fixup (cu);
19075 if (spec_die->name)
19077 name = spec_die->name;
19079 /* Copy DW_AT_external attribute if it is set. */
19080 if (spec_die->is_external)
19081 is_external = spec_die->is_external;
19085 /* Set default names for some unnamed DIEs. */
19087 if (name == NULL && tag == DW_TAG_namespace)
19088 name = CP_ANONYMOUS_NAMESPACE_STR;
19090 /* If there is no parent die to provide a namespace, and there are
19091 children, see if we can determine the namespace from their linkage
19093 if (cu->language == language_cplus
19094 && !VEC_empty (dwarf2_section_info_def,
19095 cu->per_cu->dwarf2_per_objfile->types)
19096 && die_parent == NULL
19098 && (tag == DW_TAG_class_type
19099 || tag == DW_TAG_structure_type
19100 || tag == DW_TAG_union_type))
19101 guess_partial_die_structure_name (this, cu);
19103 /* GCC might emit a nameless struct or union that has a linkage
19104 name. See http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47510. */
19106 && (tag == DW_TAG_class_type
19107 || tag == DW_TAG_interface_type
19108 || tag == DW_TAG_structure_type
19109 || tag == DW_TAG_union_type)
19110 && linkage_name != NULL)
19114 demangled = gdb_demangle (linkage_name, DMGL_TYPES);
19119 /* Strip any leading namespaces/classes, keep only the base name.
19120 DW_AT_name for named DIEs does not contain the prefixes. */
19121 base = strrchr (demangled, ':');
19122 if (base && base > demangled && base[-1] == ':')
19127 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
19130 obstack_copy0 (&objfile->per_bfd->storage_obstack,
19131 base, strlen (base)));
19139 /* Read an attribute value described by an attribute form. */
19141 static const gdb_byte *
19142 read_attribute_value (const struct die_reader_specs *reader,
19143 struct attribute *attr, unsigned form,
19144 LONGEST implicit_const, const gdb_byte *info_ptr)
19146 struct dwarf2_cu *cu = reader->cu;
19147 struct dwarf2_per_objfile *dwarf2_per_objfile
19148 = cu->per_cu->dwarf2_per_objfile;
19149 struct objfile *objfile = dwarf2_per_objfile->objfile;
19150 struct gdbarch *gdbarch = get_objfile_arch (objfile);
19151 bfd *abfd = reader->abfd;
19152 struct comp_unit_head *cu_header = &cu->header;
19153 unsigned int bytes_read;
19154 struct dwarf_block *blk;
19156 attr->form = (enum dwarf_form) form;
19159 case DW_FORM_ref_addr:
19160 if (cu->header.version == 2)
19161 DW_UNSND (attr) = read_address (abfd, info_ptr, cu, &bytes_read);
19163 DW_UNSND (attr) = read_offset (abfd, info_ptr,
19164 &cu->header, &bytes_read);
19165 info_ptr += bytes_read;
19167 case DW_FORM_GNU_ref_alt:
19168 DW_UNSND (attr) = read_offset (abfd, info_ptr, &cu->header, &bytes_read);
19169 info_ptr += bytes_read;
19172 DW_ADDR (attr) = read_address (abfd, info_ptr, cu, &bytes_read);
19173 DW_ADDR (attr) = gdbarch_adjust_dwarf2_addr (gdbarch, DW_ADDR (attr));
19174 info_ptr += bytes_read;
19176 case DW_FORM_block2:
19177 blk = dwarf_alloc_block (cu);
19178 blk->size = read_2_bytes (abfd, info_ptr);
19180 blk->data = read_n_bytes (abfd, info_ptr, blk->size);
19181 info_ptr += blk->size;
19182 DW_BLOCK (attr) = blk;
19184 case DW_FORM_block4:
19185 blk = dwarf_alloc_block (cu);
19186 blk->size = read_4_bytes (abfd, info_ptr);
19188 blk->data = read_n_bytes (abfd, info_ptr, blk->size);
19189 info_ptr += blk->size;
19190 DW_BLOCK (attr) = blk;
19192 case DW_FORM_data2:
19193 DW_UNSND (attr) = read_2_bytes (abfd, info_ptr);
19196 case DW_FORM_data4:
19197 DW_UNSND (attr) = read_4_bytes (abfd, info_ptr);
19200 case DW_FORM_data8:
19201 DW_UNSND (attr) = read_8_bytes (abfd, info_ptr);
19204 case DW_FORM_data16:
19205 blk = dwarf_alloc_block (cu);
19207 blk->data = read_n_bytes (abfd, info_ptr, 16);
19209 DW_BLOCK (attr) = blk;
19211 case DW_FORM_sec_offset:
19212 DW_UNSND (attr) = read_offset (abfd, info_ptr, &cu->header, &bytes_read);
19213 info_ptr += bytes_read;
19215 case DW_FORM_string:
19216 DW_STRING (attr) = read_direct_string (abfd, info_ptr, &bytes_read);
19217 DW_STRING_IS_CANONICAL (attr) = 0;
19218 info_ptr += bytes_read;
19221 if (!cu->per_cu->is_dwz)
19223 DW_STRING (attr) = read_indirect_string (dwarf2_per_objfile,
19224 abfd, info_ptr, cu_header,
19226 DW_STRING_IS_CANONICAL (attr) = 0;
19227 info_ptr += bytes_read;
19231 case DW_FORM_line_strp:
19232 if (!cu->per_cu->is_dwz)
19234 DW_STRING (attr) = read_indirect_line_string (dwarf2_per_objfile,
19236 cu_header, &bytes_read);
19237 DW_STRING_IS_CANONICAL (attr) = 0;
19238 info_ptr += bytes_read;
19242 case DW_FORM_GNU_strp_alt:
19244 struct dwz_file *dwz = dwarf2_get_dwz_file (dwarf2_per_objfile);
19245 LONGEST str_offset = read_offset (abfd, info_ptr, cu_header,
19248 DW_STRING (attr) = read_indirect_string_from_dwz (objfile,
19250 DW_STRING_IS_CANONICAL (attr) = 0;
19251 info_ptr += bytes_read;
19254 case DW_FORM_exprloc:
19255 case DW_FORM_block:
19256 blk = dwarf_alloc_block (cu);
19257 blk->size = read_unsigned_leb128 (abfd, info_ptr, &bytes_read);
19258 info_ptr += bytes_read;
19259 blk->data = read_n_bytes (abfd, info_ptr, blk->size);
19260 info_ptr += blk->size;
19261 DW_BLOCK (attr) = blk;
19263 case DW_FORM_block1:
19264 blk = dwarf_alloc_block (cu);
19265 blk->size = read_1_byte (abfd, info_ptr);
19267 blk->data = read_n_bytes (abfd, info_ptr, blk->size);
19268 info_ptr += blk->size;
19269 DW_BLOCK (attr) = blk;
19271 case DW_FORM_data1:
19272 DW_UNSND (attr) = read_1_byte (abfd, info_ptr);
19276 DW_UNSND (attr) = read_1_byte (abfd, info_ptr);
19279 case DW_FORM_flag_present:
19280 DW_UNSND (attr) = 1;
19282 case DW_FORM_sdata:
19283 DW_SND (attr) = read_signed_leb128 (abfd, info_ptr, &bytes_read);
19284 info_ptr += bytes_read;
19286 case DW_FORM_udata:
19287 DW_UNSND (attr) = read_unsigned_leb128 (abfd, info_ptr, &bytes_read);
19288 info_ptr += bytes_read;
19291 DW_UNSND (attr) = (to_underlying (cu->header.sect_off)
19292 + read_1_byte (abfd, info_ptr));
19296 DW_UNSND (attr) = (to_underlying (cu->header.sect_off)
19297 + read_2_bytes (abfd, info_ptr));
19301 DW_UNSND (attr) = (to_underlying (cu->header.sect_off)
19302 + read_4_bytes (abfd, info_ptr));
19306 DW_UNSND (attr) = (to_underlying (cu->header.sect_off)
19307 + read_8_bytes (abfd, info_ptr));
19310 case DW_FORM_ref_sig8:
19311 DW_SIGNATURE (attr) = read_8_bytes (abfd, info_ptr);
19314 case DW_FORM_ref_udata:
19315 DW_UNSND (attr) = (to_underlying (cu->header.sect_off)
19316 + read_unsigned_leb128 (abfd, info_ptr, &bytes_read));
19317 info_ptr += bytes_read;
19319 case DW_FORM_indirect:
19320 form = read_unsigned_leb128 (abfd, info_ptr, &bytes_read);
19321 info_ptr += bytes_read;
19322 if (form == DW_FORM_implicit_const)
19324 implicit_const = read_signed_leb128 (abfd, info_ptr, &bytes_read);
19325 info_ptr += bytes_read;
19327 info_ptr = read_attribute_value (reader, attr, form, implicit_const,
19330 case DW_FORM_implicit_const:
19331 DW_SND (attr) = implicit_const;
19333 case DW_FORM_addrx:
19334 case DW_FORM_GNU_addr_index:
19335 if (reader->dwo_file == NULL)
19337 /* For now flag a hard error.
19338 Later we can turn this into a complaint. */
19339 error (_("Dwarf Error: %s found in non-DWO CU [in module %s]"),
19340 dwarf_form_name (form),
19341 bfd_get_filename (abfd));
19343 DW_ADDR (attr) = read_addr_index_from_leb128 (cu, info_ptr, &bytes_read);
19344 info_ptr += bytes_read;
19347 case DW_FORM_strx1:
19348 case DW_FORM_strx2:
19349 case DW_FORM_strx3:
19350 case DW_FORM_strx4:
19351 case DW_FORM_GNU_str_index:
19352 if (reader->dwo_file == NULL)
19354 /* For now flag a hard error.
19355 Later we can turn this into a complaint if warranted. */
19356 error (_("Dwarf Error: %s found in non-DWO CU [in module %s]"),
19357 dwarf_form_name (form),
19358 bfd_get_filename (abfd));
19361 ULONGEST str_index;
19362 if (form == DW_FORM_strx1)
19364 str_index = read_1_byte (abfd, info_ptr);
19367 else if (form == DW_FORM_strx2)
19369 str_index = read_2_bytes (abfd, info_ptr);
19372 else if (form == DW_FORM_strx3)
19374 str_index = read_3_bytes (abfd, info_ptr);
19377 else if (form == DW_FORM_strx4)
19379 str_index = read_4_bytes (abfd, info_ptr);
19384 str_index = read_unsigned_leb128 (abfd, info_ptr, &bytes_read);
19385 info_ptr += bytes_read;
19387 DW_STRING (attr) = read_str_index (reader, str_index);
19388 DW_STRING_IS_CANONICAL (attr) = 0;
19392 error (_("Dwarf Error: Cannot handle %s in DWARF reader [in module %s]"),
19393 dwarf_form_name (form),
19394 bfd_get_filename (abfd));
19398 if (cu->per_cu->is_dwz && attr_form_is_ref (attr))
19399 attr->form = DW_FORM_GNU_ref_alt;
19401 /* We have seen instances where the compiler tried to emit a byte
19402 size attribute of -1 which ended up being encoded as an unsigned
19403 0xffffffff. Although 0xffffffff is technically a valid size value,
19404 an object of this size seems pretty unlikely so we can relatively
19405 safely treat these cases as if the size attribute was invalid and
19406 treat them as zero by default. */
19407 if (attr->name == DW_AT_byte_size
19408 && form == DW_FORM_data4
19409 && DW_UNSND (attr) >= 0xffffffff)
19412 (_("Suspicious DW_AT_byte_size value treated as zero instead of %s"),
19413 hex_string (DW_UNSND (attr)));
19414 DW_UNSND (attr) = 0;
19420 /* Read an attribute described by an abbreviated attribute. */
19422 static const gdb_byte *
19423 read_attribute (const struct die_reader_specs *reader,
19424 struct attribute *attr, struct attr_abbrev *abbrev,
19425 const gdb_byte *info_ptr)
19427 attr->name = abbrev->name;
19428 return read_attribute_value (reader, attr, abbrev->form,
19429 abbrev->implicit_const, info_ptr);
19432 /* Read dwarf information from a buffer. */
19434 static unsigned int
19435 read_1_byte (bfd *abfd, const gdb_byte *buf)
19437 return bfd_get_8 (abfd, buf);
19441 read_1_signed_byte (bfd *abfd, const gdb_byte *buf)
19443 return bfd_get_signed_8 (abfd, buf);
19446 static unsigned int
19447 read_2_bytes (bfd *abfd, const gdb_byte *buf)
19449 return bfd_get_16 (abfd, buf);
19453 read_2_signed_bytes (bfd *abfd, const gdb_byte *buf)
19455 return bfd_get_signed_16 (abfd, buf);
19458 static unsigned int
19459 read_3_bytes (bfd *abfd, const gdb_byte *buf)
19461 unsigned int result = 0;
19462 for (int i = 0; i < 3; ++i)
19464 unsigned char byte = bfd_get_8 (abfd, buf);
19466 result |= ((unsigned int) byte << (i * 8));
19471 static unsigned int
19472 read_4_bytes (bfd *abfd, const gdb_byte *buf)
19474 return bfd_get_32 (abfd, buf);
19478 read_4_signed_bytes (bfd *abfd, const gdb_byte *buf)
19480 return bfd_get_signed_32 (abfd, buf);
19484 read_8_bytes (bfd *abfd, const gdb_byte *buf)
19486 return bfd_get_64 (abfd, buf);
19490 read_address (bfd *abfd, const gdb_byte *buf, struct dwarf2_cu *cu,
19491 unsigned int *bytes_read)
19493 struct comp_unit_head *cu_header = &cu->header;
19494 CORE_ADDR retval = 0;
19496 if (cu_header->signed_addr_p)
19498 switch (cu_header->addr_size)
19501 retval = bfd_get_signed_16 (abfd, buf);
19504 retval = bfd_get_signed_32 (abfd, buf);
19507 retval = bfd_get_signed_64 (abfd, buf);
19510 internal_error (__FILE__, __LINE__,
19511 _("read_address: bad switch, signed [in module %s]"),
19512 bfd_get_filename (abfd));
19517 switch (cu_header->addr_size)
19520 retval = bfd_get_16 (abfd, buf);
19523 retval = bfd_get_32 (abfd, buf);
19526 retval = bfd_get_64 (abfd, buf);
19529 internal_error (__FILE__, __LINE__,
19530 _("read_address: bad switch, "
19531 "unsigned [in module %s]"),
19532 bfd_get_filename (abfd));
19536 *bytes_read = cu_header->addr_size;
19540 /* Read the initial length from a section. The (draft) DWARF 3
19541 specification allows the initial length to take up either 4 bytes
19542 or 12 bytes. If the first 4 bytes are 0xffffffff, then the next 8
19543 bytes describe the length and all offsets will be 8 bytes in length
19546 An older, non-standard 64-bit format is also handled by this
19547 function. The older format in question stores the initial length
19548 as an 8-byte quantity without an escape value. Lengths greater
19549 than 2^32 aren't very common which means that the initial 4 bytes
19550 is almost always zero. Since a length value of zero doesn't make
19551 sense for the 32-bit format, this initial zero can be considered to
19552 be an escape value which indicates the presence of the older 64-bit
19553 format. As written, the code can't detect (old format) lengths
19554 greater than 4GB. If it becomes necessary to handle lengths
19555 somewhat larger than 4GB, we could allow other small values (such
19556 as the non-sensical values of 1, 2, and 3) to also be used as
19557 escape values indicating the presence of the old format.
19559 The value returned via bytes_read should be used to increment the
19560 relevant pointer after calling read_initial_length().
19562 [ Note: read_initial_length() and read_offset() are based on the
19563 document entitled "DWARF Debugging Information Format", revision
19564 3, draft 8, dated November 19, 2001. This document was obtained
19567 http://reality.sgiweb.org/davea/dwarf3-draft8-011125.pdf
19569 This document is only a draft and is subject to change. (So beware.)
19571 Details regarding the older, non-standard 64-bit format were
19572 determined empirically by examining 64-bit ELF files produced by
19573 the SGI toolchain on an IRIX 6.5 machine.
19575 - Kevin, July 16, 2002
19579 read_initial_length (bfd *abfd, const gdb_byte *buf, unsigned int *bytes_read)
19581 LONGEST length = bfd_get_32 (abfd, buf);
19583 if (length == 0xffffffff)
19585 length = bfd_get_64 (abfd, buf + 4);
19588 else if (length == 0)
19590 /* Handle the (non-standard) 64-bit DWARF2 format used by IRIX. */
19591 length = bfd_get_64 (abfd, buf);
19602 /* Cover function for read_initial_length.
19603 Returns the length of the object at BUF, and stores the size of the
19604 initial length in *BYTES_READ and stores the size that offsets will be in
19606 If the initial length size is not equivalent to that specified in
19607 CU_HEADER then issue a complaint.
19608 This is useful when reading non-comp-unit headers. */
19611 read_checked_initial_length_and_offset (bfd *abfd, const gdb_byte *buf,
19612 const struct comp_unit_head *cu_header,
19613 unsigned int *bytes_read,
19614 unsigned int *offset_size)
19616 LONGEST length = read_initial_length (abfd, buf, bytes_read);
19618 gdb_assert (cu_header->initial_length_size == 4
19619 || cu_header->initial_length_size == 8
19620 || cu_header->initial_length_size == 12);
19622 if (cu_header->initial_length_size != *bytes_read)
19623 complaint (_("intermixed 32-bit and 64-bit DWARF sections"));
19625 *offset_size = (*bytes_read == 4) ? 4 : 8;
19629 /* Read an offset from the data stream. The size of the offset is
19630 given by cu_header->offset_size. */
19633 read_offset (bfd *abfd, const gdb_byte *buf,
19634 const struct comp_unit_head *cu_header,
19635 unsigned int *bytes_read)
19637 LONGEST offset = read_offset_1 (abfd, buf, cu_header->offset_size);
19639 *bytes_read = cu_header->offset_size;
19643 /* Read an offset from the data stream. */
19646 read_offset_1 (bfd *abfd, const gdb_byte *buf, unsigned int offset_size)
19648 LONGEST retval = 0;
19650 switch (offset_size)
19653 retval = bfd_get_32 (abfd, buf);
19656 retval = bfd_get_64 (abfd, buf);
19659 internal_error (__FILE__, __LINE__,
19660 _("read_offset_1: bad switch [in module %s]"),
19661 bfd_get_filename (abfd));
19667 static const gdb_byte *
19668 read_n_bytes (bfd *abfd, const gdb_byte *buf, unsigned int size)
19670 /* If the size of a host char is 8 bits, we can return a pointer
19671 to the buffer, otherwise we have to copy the data to a buffer
19672 allocated on the temporary obstack. */
19673 gdb_assert (HOST_CHAR_BIT == 8);
19677 static const char *
19678 read_direct_string (bfd *abfd, const gdb_byte *buf,
19679 unsigned int *bytes_read_ptr)
19681 /* If the size of a host char is 8 bits, we can return a pointer
19682 to the string, otherwise we have to copy the string to a buffer
19683 allocated on the temporary obstack. */
19684 gdb_assert (HOST_CHAR_BIT == 8);
19687 *bytes_read_ptr = 1;
19690 *bytes_read_ptr = strlen ((const char *) buf) + 1;
19691 return (const char *) buf;
19694 /* Return pointer to string at section SECT offset STR_OFFSET with error
19695 reporting strings FORM_NAME and SECT_NAME. */
19697 static const char *
19698 read_indirect_string_at_offset_from (struct objfile *objfile,
19699 bfd *abfd, LONGEST str_offset,
19700 struct dwarf2_section_info *sect,
19701 const char *form_name,
19702 const char *sect_name)
19704 dwarf2_read_section (objfile, sect);
19705 if (sect->buffer == NULL)
19706 error (_("%s used without %s section [in module %s]"),
19707 form_name, sect_name, bfd_get_filename (abfd));
19708 if (str_offset >= sect->size)
19709 error (_("%s pointing outside of %s section [in module %s]"),
19710 form_name, sect_name, bfd_get_filename (abfd));
19711 gdb_assert (HOST_CHAR_BIT == 8);
19712 if (sect->buffer[str_offset] == '\0')
19714 return (const char *) (sect->buffer + str_offset);
19717 /* Return pointer to string at .debug_str offset STR_OFFSET. */
19719 static const char *
19720 read_indirect_string_at_offset (struct dwarf2_per_objfile *dwarf2_per_objfile,
19721 bfd *abfd, LONGEST str_offset)
19723 return read_indirect_string_at_offset_from (dwarf2_per_objfile->objfile,
19725 &dwarf2_per_objfile->str,
19726 "DW_FORM_strp", ".debug_str");
19729 /* Return pointer to string at .debug_line_str offset STR_OFFSET. */
19731 static const char *
19732 read_indirect_line_string_at_offset (struct dwarf2_per_objfile *dwarf2_per_objfile,
19733 bfd *abfd, LONGEST str_offset)
19735 return read_indirect_string_at_offset_from (dwarf2_per_objfile->objfile,
19737 &dwarf2_per_objfile->line_str,
19738 "DW_FORM_line_strp",
19739 ".debug_line_str");
19742 /* Read a string at offset STR_OFFSET in the .debug_str section from
19743 the .dwz file DWZ. Throw an error if the offset is too large. If
19744 the string consists of a single NUL byte, return NULL; otherwise
19745 return a pointer to the string. */
19747 static const char *
19748 read_indirect_string_from_dwz (struct objfile *objfile, struct dwz_file *dwz,
19749 LONGEST str_offset)
19751 dwarf2_read_section (objfile, &dwz->str);
19753 if (dwz->str.buffer == NULL)
19754 error (_("DW_FORM_GNU_strp_alt used without .debug_str "
19755 "section [in module %s]"),
19756 bfd_get_filename (dwz->dwz_bfd));
19757 if (str_offset >= dwz->str.size)
19758 error (_("DW_FORM_GNU_strp_alt pointing outside of "
19759 ".debug_str section [in module %s]"),
19760 bfd_get_filename (dwz->dwz_bfd));
19761 gdb_assert (HOST_CHAR_BIT == 8);
19762 if (dwz->str.buffer[str_offset] == '\0')
19764 return (const char *) (dwz->str.buffer + str_offset);
19767 /* Return pointer to string at .debug_str offset as read from BUF.
19768 BUF is assumed to be in a compilation unit described by CU_HEADER.
19769 Return *BYTES_READ_PTR count of bytes read from BUF. */
19771 static const char *
19772 read_indirect_string (struct dwarf2_per_objfile *dwarf2_per_objfile, bfd *abfd,
19773 const gdb_byte *buf,
19774 const struct comp_unit_head *cu_header,
19775 unsigned int *bytes_read_ptr)
19777 LONGEST str_offset = read_offset (abfd, buf, cu_header, bytes_read_ptr);
19779 return read_indirect_string_at_offset (dwarf2_per_objfile, abfd, str_offset);
19782 /* Return pointer to string at .debug_line_str offset as read from BUF.
19783 BUF is assumed to be in a compilation unit described by CU_HEADER.
19784 Return *BYTES_READ_PTR count of bytes read from BUF. */
19786 static const char *
19787 read_indirect_line_string (struct dwarf2_per_objfile *dwarf2_per_objfile,
19788 bfd *abfd, const gdb_byte *buf,
19789 const struct comp_unit_head *cu_header,
19790 unsigned int *bytes_read_ptr)
19792 LONGEST str_offset = read_offset (abfd, buf, cu_header, bytes_read_ptr);
19794 return read_indirect_line_string_at_offset (dwarf2_per_objfile, abfd,
19799 read_unsigned_leb128 (bfd *abfd, const gdb_byte *buf,
19800 unsigned int *bytes_read_ptr)
19803 unsigned int num_read;
19805 unsigned char byte;
19812 byte = bfd_get_8 (abfd, buf);
19815 result |= ((ULONGEST) (byte & 127) << shift);
19816 if ((byte & 128) == 0)
19822 *bytes_read_ptr = num_read;
19827 read_signed_leb128 (bfd *abfd, const gdb_byte *buf,
19828 unsigned int *bytes_read_ptr)
19831 int shift, num_read;
19832 unsigned char byte;
19839 byte = bfd_get_8 (abfd, buf);
19842 result |= ((ULONGEST) (byte & 127) << shift);
19844 if ((byte & 128) == 0)
19849 if ((shift < 8 * sizeof (result)) && (byte & 0x40))
19850 result |= -(((ULONGEST) 1) << shift);
19851 *bytes_read_ptr = num_read;
19855 /* Given index ADDR_INDEX in .debug_addr, fetch the value.
19856 ADDR_BASE is the DW_AT_GNU_addr_base attribute or zero.
19857 ADDR_SIZE is the size of addresses from the CU header. */
19860 read_addr_index_1 (struct dwarf2_per_objfile *dwarf2_per_objfile,
19861 unsigned int addr_index, ULONGEST addr_base, int addr_size)
19863 struct objfile *objfile = dwarf2_per_objfile->objfile;
19864 bfd *abfd = objfile->obfd;
19865 const gdb_byte *info_ptr;
19867 dwarf2_read_section (objfile, &dwarf2_per_objfile->addr);
19868 if (dwarf2_per_objfile->addr.buffer == NULL)
19869 error (_("DW_FORM_addr_index used without .debug_addr section [in module %s]"),
19870 objfile_name (objfile));
19871 if (addr_base + addr_index * addr_size >= dwarf2_per_objfile->addr.size)
19872 error (_("DW_FORM_addr_index pointing outside of "
19873 ".debug_addr section [in module %s]"),
19874 objfile_name (objfile));
19875 info_ptr = (dwarf2_per_objfile->addr.buffer
19876 + addr_base + addr_index * addr_size);
19877 if (addr_size == 4)
19878 return bfd_get_32 (abfd, info_ptr);
19880 return bfd_get_64 (abfd, info_ptr);
19883 /* Given index ADDR_INDEX in .debug_addr, fetch the value. */
19886 read_addr_index (struct dwarf2_cu *cu, unsigned int addr_index)
19888 return read_addr_index_1 (cu->per_cu->dwarf2_per_objfile, addr_index,
19889 cu->addr_base, cu->header.addr_size);
19892 /* Given a pointer to an leb128 value, fetch the value from .debug_addr. */
19895 read_addr_index_from_leb128 (struct dwarf2_cu *cu, const gdb_byte *info_ptr,
19896 unsigned int *bytes_read)
19898 bfd *abfd = cu->per_cu->dwarf2_per_objfile->objfile->obfd;
19899 unsigned int addr_index = read_unsigned_leb128 (abfd, info_ptr, bytes_read);
19901 return read_addr_index (cu, addr_index);
19904 /* Data structure to pass results from dwarf2_read_addr_index_reader
19905 back to dwarf2_read_addr_index. */
19907 struct dwarf2_read_addr_index_data
19909 ULONGEST addr_base;
19913 /* die_reader_func for dwarf2_read_addr_index. */
19916 dwarf2_read_addr_index_reader (const struct die_reader_specs *reader,
19917 const gdb_byte *info_ptr,
19918 struct die_info *comp_unit_die,
19922 struct dwarf2_cu *cu = reader->cu;
19923 struct dwarf2_read_addr_index_data *aidata =
19924 (struct dwarf2_read_addr_index_data *) data;
19926 aidata->addr_base = cu->addr_base;
19927 aidata->addr_size = cu->header.addr_size;
19930 /* Given an index in .debug_addr, fetch the value.
19931 NOTE: This can be called during dwarf expression evaluation,
19932 long after the debug information has been read, and thus per_cu->cu
19933 may no longer exist. */
19936 dwarf2_read_addr_index (struct dwarf2_per_cu_data *per_cu,
19937 unsigned int addr_index)
19939 struct dwarf2_per_objfile *dwarf2_per_objfile = per_cu->dwarf2_per_objfile;
19940 struct dwarf2_cu *cu = per_cu->cu;
19941 ULONGEST addr_base;
19944 /* We need addr_base and addr_size.
19945 If we don't have PER_CU->cu, we have to get it.
19946 Nasty, but the alternative is storing the needed info in PER_CU,
19947 which at this point doesn't seem justified: it's not clear how frequently
19948 it would get used and it would increase the size of every PER_CU.
19949 Entry points like dwarf2_per_cu_addr_size do a similar thing
19950 so we're not in uncharted territory here.
19951 Alas we need to be a bit more complicated as addr_base is contained
19954 We don't need to read the entire CU(/TU).
19955 We just need the header and top level die.
19957 IWBN to use the aging mechanism to let us lazily later discard the CU.
19958 For now we skip this optimization. */
19962 addr_base = cu->addr_base;
19963 addr_size = cu->header.addr_size;
19967 struct dwarf2_read_addr_index_data aidata;
19969 /* Note: We can't use init_cutu_and_read_dies_simple here,
19970 we need addr_base. */
19971 init_cutu_and_read_dies (per_cu, NULL, 0, 0, false,
19972 dwarf2_read_addr_index_reader, &aidata);
19973 addr_base = aidata.addr_base;
19974 addr_size = aidata.addr_size;
19977 return read_addr_index_1 (dwarf2_per_objfile, addr_index, addr_base,
19981 /* Given a DW_FORM_GNU_str_index or DW_FORM_strx, fetch the string.
19982 This is only used by the Fission support. */
19984 static const char *
19985 read_str_index (const struct die_reader_specs *reader, ULONGEST str_index)
19987 struct dwarf2_cu *cu = reader->cu;
19988 struct dwarf2_per_objfile *dwarf2_per_objfile
19989 = cu->per_cu->dwarf2_per_objfile;
19990 struct objfile *objfile = dwarf2_per_objfile->objfile;
19991 const char *objf_name = objfile_name (objfile);
19992 bfd *abfd = objfile->obfd;
19993 struct dwarf2_section_info *str_section = &reader->dwo_file->sections.str;
19994 struct dwarf2_section_info *str_offsets_section =
19995 &reader->dwo_file->sections.str_offsets;
19996 const gdb_byte *info_ptr;
19997 ULONGEST str_offset;
19998 static const char form_name[] = "DW_FORM_GNU_str_index or DW_FORM_strx";
20000 dwarf2_read_section (objfile, str_section);
20001 dwarf2_read_section (objfile, str_offsets_section);
20002 if (str_section->buffer == NULL)
20003 error (_("%s used without .debug_str.dwo section"
20004 " in CU at offset %s [in module %s]"),
20005 form_name, sect_offset_str (cu->header.sect_off), objf_name);
20006 if (str_offsets_section->buffer == NULL)
20007 error (_("%s used without .debug_str_offsets.dwo section"
20008 " in CU at offset %s [in module %s]"),
20009 form_name, sect_offset_str (cu->header.sect_off), objf_name);
20010 if (str_index * cu->header.offset_size >= str_offsets_section->size)
20011 error (_("%s pointing outside of .debug_str_offsets.dwo"
20012 " section in CU at offset %s [in module %s]"),
20013 form_name, sect_offset_str (cu->header.sect_off), objf_name);
20014 info_ptr = (str_offsets_section->buffer
20015 + str_index * cu->header.offset_size);
20016 if (cu->header.offset_size == 4)
20017 str_offset = bfd_get_32 (abfd, info_ptr);
20019 str_offset = bfd_get_64 (abfd, info_ptr);
20020 if (str_offset >= str_section->size)
20021 error (_("Offset from %s pointing outside of"
20022 " .debug_str.dwo section in CU at offset %s [in module %s]"),
20023 form_name, sect_offset_str (cu->header.sect_off), objf_name);
20024 return (const char *) (str_section->buffer + str_offset);
20027 /* Return the length of an LEB128 number in BUF. */
20030 leb128_size (const gdb_byte *buf)
20032 const gdb_byte *begin = buf;
20038 if ((byte & 128) == 0)
20039 return buf - begin;
20044 set_cu_language (unsigned int lang, struct dwarf2_cu *cu)
20053 cu->language = language_c;
20056 case DW_LANG_C_plus_plus:
20057 case DW_LANG_C_plus_plus_11:
20058 case DW_LANG_C_plus_plus_14:
20059 cu->language = language_cplus;
20062 cu->language = language_d;
20064 case DW_LANG_Fortran77:
20065 case DW_LANG_Fortran90:
20066 case DW_LANG_Fortran95:
20067 case DW_LANG_Fortran03:
20068 case DW_LANG_Fortran08:
20069 cu->language = language_fortran;
20072 cu->language = language_go;
20074 case DW_LANG_Mips_Assembler:
20075 cu->language = language_asm;
20077 case DW_LANG_Ada83:
20078 case DW_LANG_Ada95:
20079 cu->language = language_ada;
20081 case DW_LANG_Modula2:
20082 cu->language = language_m2;
20084 case DW_LANG_Pascal83:
20085 cu->language = language_pascal;
20088 cu->language = language_objc;
20091 case DW_LANG_Rust_old:
20092 cu->language = language_rust;
20094 case DW_LANG_Cobol74:
20095 case DW_LANG_Cobol85:
20097 cu->language = language_minimal;
20100 cu->language_defn = language_def (cu->language);
20103 /* Return the named attribute or NULL if not there. */
20105 static struct attribute *
20106 dwarf2_attr (struct die_info *die, unsigned int name, struct dwarf2_cu *cu)
20111 struct attribute *spec = NULL;
20113 for (i = 0; i < die->num_attrs; ++i)
20115 if (die->attrs[i].name == name)
20116 return &die->attrs[i];
20117 if (die->attrs[i].name == DW_AT_specification
20118 || die->attrs[i].name == DW_AT_abstract_origin)
20119 spec = &die->attrs[i];
20125 die = follow_die_ref (die, spec, &cu);
20131 /* Return the named attribute or NULL if not there,
20132 but do not follow DW_AT_specification, etc.
20133 This is for use in contexts where we're reading .debug_types dies.
20134 Following DW_AT_specification, DW_AT_abstract_origin will take us
20135 back up the chain, and we want to go down. */
20137 static struct attribute *
20138 dwarf2_attr_no_follow (struct die_info *die, unsigned int name)
20142 for (i = 0; i < die->num_attrs; ++i)
20143 if (die->attrs[i].name == name)
20144 return &die->attrs[i];
20149 /* Return the string associated with a string-typed attribute, or NULL if it
20150 is either not found or is of an incorrect type. */
20152 static const char *
20153 dwarf2_string_attr (struct die_info *die, unsigned int name, struct dwarf2_cu *cu)
20155 struct attribute *attr;
20156 const char *str = NULL;
20158 attr = dwarf2_attr (die, name, cu);
20162 if (attr->form == DW_FORM_strp || attr->form == DW_FORM_line_strp
20163 || attr->form == DW_FORM_string
20164 || attr->form == DW_FORM_strx
20165 || attr->form == DW_FORM_GNU_str_index
20166 || attr->form == DW_FORM_GNU_strp_alt)
20167 str = DW_STRING (attr);
20169 complaint (_("string type expected for attribute %s for "
20170 "DIE at %s in module %s"),
20171 dwarf_attr_name (name), sect_offset_str (die->sect_off),
20172 objfile_name (cu->per_cu->dwarf2_per_objfile->objfile));
20178 /* Return non-zero iff the attribute NAME is defined for the given DIE,
20179 and holds a non-zero value. This function should only be used for
20180 DW_FORM_flag or DW_FORM_flag_present attributes. */
20183 dwarf2_flag_true_p (struct die_info *die, unsigned name, struct dwarf2_cu *cu)
20185 struct attribute *attr = dwarf2_attr (die, name, cu);
20187 return (attr && DW_UNSND (attr));
20191 die_is_declaration (struct die_info *die, struct dwarf2_cu *cu)
20193 /* A DIE is a declaration if it has a DW_AT_declaration attribute
20194 which value is non-zero. However, we have to be careful with
20195 DIEs having a DW_AT_specification attribute, because dwarf2_attr()
20196 (via dwarf2_flag_true_p) follows this attribute. So we may
20197 end up accidently finding a declaration attribute that belongs
20198 to a different DIE referenced by the specification attribute,
20199 even though the given DIE does not have a declaration attribute. */
20200 return (dwarf2_flag_true_p (die, DW_AT_declaration, cu)
20201 && dwarf2_attr (die, DW_AT_specification, cu) == NULL);
20204 /* Return the die giving the specification for DIE, if there is
20205 one. *SPEC_CU is the CU containing DIE on input, and the CU
20206 containing the return value on output. If there is no
20207 specification, but there is an abstract origin, that is
20210 static struct die_info *
20211 die_specification (struct die_info *die, struct dwarf2_cu **spec_cu)
20213 struct attribute *spec_attr = dwarf2_attr (die, DW_AT_specification,
20216 if (spec_attr == NULL)
20217 spec_attr = dwarf2_attr (die, DW_AT_abstract_origin, *spec_cu);
20219 if (spec_attr == NULL)
20222 return follow_die_ref (die, spec_attr, spec_cu);
20225 /* Stub for free_line_header to match void * callback types. */
20228 free_line_header_voidp (void *arg)
20230 struct line_header *lh = (struct line_header *) arg;
20236 line_header::add_include_dir (const char *include_dir)
20238 if (dwarf_line_debug >= 2)
20239 fprintf_unfiltered (gdb_stdlog, "Adding dir %zu: %s\n",
20240 include_dirs.size () + 1, include_dir);
20242 include_dirs.push_back (include_dir);
20246 line_header::add_file_name (const char *name,
20248 unsigned int mod_time,
20249 unsigned int length)
20251 if (dwarf_line_debug >= 2)
20252 fprintf_unfiltered (gdb_stdlog, "Adding file %u: %s\n",
20253 (unsigned) file_names.size () + 1, name);
20255 file_names.emplace_back (name, d_index, mod_time, length);
20258 /* A convenience function to find the proper .debug_line section for a CU. */
20260 static struct dwarf2_section_info *
20261 get_debug_line_section (struct dwarf2_cu *cu)
20263 struct dwarf2_section_info *section;
20264 struct dwarf2_per_objfile *dwarf2_per_objfile
20265 = cu->per_cu->dwarf2_per_objfile;
20267 /* For TUs in DWO files, the DW_AT_stmt_list attribute lives in the
20269 if (cu->dwo_unit && cu->per_cu->is_debug_types)
20270 section = &cu->dwo_unit->dwo_file->sections.line;
20271 else if (cu->per_cu->is_dwz)
20273 struct dwz_file *dwz = dwarf2_get_dwz_file (dwarf2_per_objfile);
20275 section = &dwz->line;
20278 section = &dwarf2_per_objfile->line;
20283 /* Read directory or file name entry format, starting with byte of
20284 format count entries, ULEB128 pairs of entry formats, ULEB128 of
20285 entries count and the entries themselves in the described entry
20289 read_formatted_entries (struct dwarf2_per_objfile *dwarf2_per_objfile,
20290 bfd *abfd, const gdb_byte **bufp,
20291 struct line_header *lh,
20292 const struct comp_unit_head *cu_header,
20293 void (*callback) (struct line_header *lh,
20296 unsigned int mod_time,
20297 unsigned int length))
20299 gdb_byte format_count, formati;
20300 ULONGEST data_count, datai;
20301 const gdb_byte *buf = *bufp;
20302 const gdb_byte *format_header_data;
20303 unsigned int bytes_read;
20305 format_count = read_1_byte (abfd, buf);
20307 format_header_data = buf;
20308 for (formati = 0; formati < format_count; formati++)
20310 read_unsigned_leb128 (abfd, buf, &bytes_read);
20312 read_unsigned_leb128 (abfd, buf, &bytes_read);
20316 data_count = read_unsigned_leb128 (abfd, buf, &bytes_read);
20318 for (datai = 0; datai < data_count; datai++)
20320 const gdb_byte *format = format_header_data;
20321 struct file_entry fe;
20323 for (formati = 0; formati < format_count; formati++)
20325 ULONGEST content_type = read_unsigned_leb128 (abfd, format, &bytes_read);
20326 format += bytes_read;
20328 ULONGEST form = read_unsigned_leb128 (abfd, format, &bytes_read);
20329 format += bytes_read;
20331 gdb::optional<const char *> string;
20332 gdb::optional<unsigned int> uint;
20336 case DW_FORM_string:
20337 string.emplace (read_direct_string (abfd, buf, &bytes_read));
20341 case DW_FORM_line_strp:
20342 string.emplace (read_indirect_line_string (dwarf2_per_objfile,
20349 case DW_FORM_data1:
20350 uint.emplace (read_1_byte (abfd, buf));
20354 case DW_FORM_data2:
20355 uint.emplace (read_2_bytes (abfd, buf));
20359 case DW_FORM_data4:
20360 uint.emplace (read_4_bytes (abfd, buf));
20364 case DW_FORM_data8:
20365 uint.emplace (read_8_bytes (abfd, buf));
20369 case DW_FORM_udata:
20370 uint.emplace (read_unsigned_leb128 (abfd, buf, &bytes_read));
20374 case DW_FORM_block:
20375 /* It is valid only for DW_LNCT_timestamp which is ignored by
20380 switch (content_type)
20383 if (string.has_value ())
20386 case DW_LNCT_directory_index:
20387 if (uint.has_value ())
20388 fe.d_index = (dir_index) *uint;
20390 case DW_LNCT_timestamp:
20391 if (uint.has_value ())
20392 fe.mod_time = *uint;
20395 if (uint.has_value ())
20401 complaint (_("Unknown format content type %s"),
20402 pulongest (content_type));
20406 callback (lh, fe.name, fe.d_index, fe.mod_time, fe.length);
20412 /* Read the statement program header starting at OFFSET in
20413 .debug_line, or .debug_line.dwo. Return a pointer
20414 to a struct line_header, allocated using xmalloc.
20415 Returns NULL if there is a problem reading the header, e.g., if it
20416 has a version we don't understand.
20418 NOTE: the strings in the include directory and file name tables of
20419 the returned object point into the dwarf line section buffer,
20420 and must not be freed. */
20422 static line_header_up
20423 dwarf_decode_line_header (sect_offset sect_off, struct dwarf2_cu *cu)
20425 const gdb_byte *line_ptr;
20426 unsigned int bytes_read, offset_size;
20428 const char *cur_dir, *cur_file;
20429 struct dwarf2_section_info *section;
20431 struct dwarf2_per_objfile *dwarf2_per_objfile
20432 = cu->per_cu->dwarf2_per_objfile;
20434 section = get_debug_line_section (cu);
20435 dwarf2_read_section (dwarf2_per_objfile->objfile, section);
20436 if (section->buffer == NULL)
20438 if (cu->dwo_unit && cu->per_cu->is_debug_types)
20439 complaint (_("missing .debug_line.dwo section"));
20441 complaint (_("missing .debug_line section"));
20445 /* We can't do this until we know the section is non-empty.
20446 Only then do we know we have such a section. */
20447 abfd = get_section_bfd_owner (section);
20449 /* Make sure that at least there's room for the total_length field.
20450 That could be 12 bytes long, but we're just going to fudge that. */
20451 if (to_underlying (sect_off) + 4 >= section->size)
20453 dwarf2_statement_list_fits_in_line_number_section_complaint ();
20457 line_header_up lh (new line_header ());
20459 lh->sect_off = sect_off;
20460 lh->offset_in_dwz = cu->per_cu->is_dwz;
20462 line_ptr = section->buffer + to_underlying (sect_off);
20464 /* Read in the header. */
20466 read_checked_initial_length_and_offset (abfd, line_ptr, &cu->header,
20467 &bytes_read, &offset_size);
20468 line_ptr += bytes_read;
20469 if (line_ptr + lh->total_length > (section->buffer + section->size))
20471 dwarf2_statement_list_fits_in_line_number_section_complaint ();
20474 lh->statement_program_end = line_ptr + lh->total_length;
20475 lh->version = read_2_bytes (abfd, line_ptr);
20477 if (lh->version > 5)
20479 /* This is a version we don't understand. The format could have
20480 changed in ways we don't handle properly so just punt. */
20481 complaint (_("unsupported version in .debug_line section"));
20484 if (lh->version >= 5)
20486 gdb_byte segment_selector_size;
20488 /* Skip address size. */
20489 read_1_byte (abfd, line_ptr);
20492 segment_selector_size = read_1_byte (abfd, line_ptr);
20494 if (segment_selector_size != 0)
20496 complaint (_("unsupported segment selector size %u "
20497 "in .debug_line section"),
20498 segment_selector_size);
20502 lh->header_length = read_offset_1 (abfd, line_ptr, offset_size);
20503 line_ptr += offset_size;
20504 lh->minimum_instruction_length = read_1_byte (abfd, line_ptr);
20506 if (lh->version >= 4)
20508 lh->maximum_ops_per_instruction = read_1_byte (abfd, line_ptr);
20512 lh->maximum_ops_per_instruction = 1;
20514 if (lh->maximum_ops_per_instruction == 0)
20516 lh->maximum_ops_per_instruction = 1;
20517 complaint (_("invalid maximum_ops_per_instruction "
20518 "in `.debug_line' section"));
20521 lh->default_is_stmt = read_1_byte (abfd, line_ptr);
20523 lh->line_base = read_1_signed_byte (abfd, line_ptr);
20525 lh->line_range = read_1_byte (abfd, line_ptr);
20527 lh->opcode_base = read_1_byte (abfd, line_ptr);
20529 lh->standard_opcode_lengths.reset (new unsigned char[lh->opcode_base]);
20531 lh->standard_opcode_lengths[0] = 1; /* This should never be used anyway. */
20532 for (i = 1; i < lh->opcode_base; ++i)
20534 lh->standard_opcode_lengths[i] = read_1_byte (abfd, line_ptr);
20538 if (lh->version >= 5)
20540 /* Read directory table. */
20541 read_formatted_entries (dwarf2_per_objfile, abfd, &line_ptr, lh.get (),
20543 [] (struct line_header *header, const char *name,
20544 dir_index d_index, unsigned int mod_time,
20545 unsigned int length)
20547 header->add_include_dir (name);
20550 /* Read file name table. */
20551 read_formatted_entries (dwarf2_per_objfile, abfd, &line_ptr, lh.get (),
20553 [] (struct line_header *header, const char *name,
20554 dir_index d_index, unsigned int mod_time,
20555 unsigned int length)
20557 header->add_file_name (name, d_index, mod_time, length);
20562 /* Read directory table. */
20563 while ((cur_dir = read_direct_string (abfd, line_ptr, &bytes_read)) != NULL)
20565 line_ptr += bytes_read;
20566 lh->add_include_dir (cur_dir);
20568 line_ptr += bytes_read;
20570 /* Read file name table. */
20571 while ((cur_file = read_direct_string (abfd, line_ptr, &bytes_read)) != NULL)
20573 unsigned int mod_time, length;
20576 line_ptr += bytes_read;
20577 d_index = (dir_index) read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
20578 line_ptr += bytes_read;
20579 mod_time = read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
20580 line_ptr += bytes_read;
20581 length = read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
20582 line_ptr += bytes_read;
20584 lh->add_file_name (cur_file, d_index, mod_time, length);
20586 line_ptr += bytes_read;
20588 lh->statement_program_start = line_ptr;
20590 if (line_ptr > (section->buffer + section->size))
20591 complaint (_("line number info header doesn't "
20592 "fit in `.debug_line' section"));
20597 /* Subroutine of dwarf_decode_lines to simplify it.
20598 Return the file name of the psymtab for included file FILE_INDEX
20599 in line header LH of PST.
20600 COMP_DIR is the compilation directory (DW_AT_comp_dir) or NULL if unknown.
20601 If space for the result is malloc'd, *NAME_HOLDER will be set.
20602 Returns NULL if FILE_INDEX should be ignored, i.e., it is pst->filename. */
20604 static const char *
20605 psymtab_include_file_name (const struct line_header *lh, int file_index,
20606 const struct partial_symtab *pst,
20607 const char *comp_dir,
20608 gdb::unique_xmalloc_ptr<char> *name_holder)
20610 const file_entry &fe = lh->file_names[file_index];
20611 const char *include_name = fe.name;
20612 const char *include_name_to_compare = include_name;
20613 const char *pst_filename;
20616 const char *dir_name = fe.include_dir (lh);
20618 gdb::unique_xmalloc_ptr<char> hold_compare;
20619 if (!IS_ABSOLUTE_PATH (include_name)
20620 && (dir_name != NULL || comp_dir != NULL))
20622 /* Avoid creating a duplicate psymtab for PST.
20623 We do this by comparing INCLUDE_NAME and PST_FILENAME.
20624 Before we do the comparison, however, we need to account
20625 for DIR_NAME and COMP_DIR.
20626 First prepend dir_name (if non-NULL). If we still don't
20627 have an absolute path prepend comp_dir (if non-NULL).
20628 However, the directory we record in the include-file's
20629 psymtab does not contain COMP_DIR (to match the
20630 corresponding symtab(s)).
20635 bash$ gcc -g ./hello.c
20636 include_name = "hello.c"
20638 DW_AT_comp_dir = comp_dir = "/tmp"
20639 DW_AT_name = "./hello.c"
20643 if (dir_name != NULL)
20645 name_holder->reset (concat (dir_name, SLASH_STRING,
20646 include_name, (char *) NULL));
20647 include_name = name_holder->get ();
20648 include_name_to_compare = include_name;
20650 if (!IS_ABSOLUTE_PATH (include_name) && comp_dir != NULL)
20652 hold_compare.reset (concat (comp_dir, SLASH_STRING,
20653 include_name, (char *) NULL));
20654 include_name_to_compare = hold_compare.get ();
20658 pst_filename = pst->filename;
20659 gdb::unique_xmalloc_ptr<char> copied_name;
20660 if (!IS_ABSOLUTE_PATH (pst_filename) && pst->dirname != NULL)
20662 copied_name.reset (concat (pst->dirname, SLASH_STRING,
20663 pst_filename, (char *) NULL));
20664 pst_filename = copied_name.get ();
20667 file_is_pst = FILENAME_CMP (include_name_to_compare, pst_filename) == 0;
20671 return include_name;
20674 /* State machine to track the state of the line number program. */
20676 class lnp_state_machine
20679 /* Initialize a machine state for the start of a line number
20681 lnp_state_machine (struct dwarf2_cu *cu, gdbarch *arch, line_header *lh,
20682 bool record_lines_p);
20684 file_entry *current_file ()
20686 /* lh->file_names is 0-based, but the file name numbers in the
20687 statement program are 1-based. */
20688 return m_line_header->file_name_at (m_file);
20691 /* Record the line in the state machine. END_SEQUENCE is true if
20692 we're processing the end of a sequence. */
20693 void record_line (bool end_sequence);
20695 /* Check ADDRESS is zero and less than UNRELOCATED_LOWPC and if true
20696 nop-out rest of the lines in this sequence. */
20697 void check_line_address (struct dwarf2_cu *cu,
20698 const gdb_byte *line_ptr,
20699 CORE_ADDR unrelocated_lowpc, CORE_ADDR address);
20701 void handle_set_discriminator (unsigned int discriminator)
20703 m_discriminator = discriminator;
20704 m_line_has_non_zero_discriminator |= discriminator != 0;
20707 /* Handle DW_LNE_set_address. */
20708 void handle_set_address (CORE_ADDR baseaddr, CORE_ADDR address)
20711 address += baseaddr;
20712 m_address = gdbarch_adjust_dwarf2_line (m_gdbarch, address, false);
20715 /* Handle DW_LNS_advance_pc. */
20716 void handle_advance_pc (CORE_ADDR adjust);
20718 /* Handle a special opcode. */
20719 void handle_special_opcode (unsigned char op_code);
20721 /* Handle DW_LNS_advance_line. */
20722 void handle_advance_line (int line_delta)
20724 advance_line (line_delta);
20727 /* Handle DW_LNS_set_file. */
20728 void handle_set_file (file_name_index file);
20730 /* Handle DW_LNS_negate_stmt. */
20731 void handle_negate_stmt ()
20733 m_is_stmt = !m_is_stmt;
20736 /* Handle DW_LNS_const_add_pc. */
20737 void handle_const_add_pc ();
20739 /* Handle DW_LNS_fixed_advance_pc. */
20740 void handle_fixed_advance_pc (CORE_ADDR addr_adj)
20742 m_address += gdbarch_adjust_dwarf2_line (m_gdbarch, addr_adj, true);
20746 /* Handle DW_LNS_copy. */
20747 void handle_copy ()
20749 record_line (false);
20750 m_discriminator = 0;
20753 /* Handle DW_LNE_end_sequence. */
20754 void handle_end_sequence ()
20756 m_currently_recording_lines = true;
20760 /* Advance the line by LINE_DELTA. */
20761 void advance_line (int line_delta)
20763 m_line += line_delta;
20765 if (line_delta != 0)
20766 m_line_has_non_zero_discriminator = m_discriminator != 0;
20769 struct dwarf2_cu *m_cu;
20771 gdbarch *m_gdbarch;
20773 /* True if we're recording lines.
20774 Otherwise we're building partial symtabs and are just interested in
20775 finding include files mentioned by the line number program. */
20776 bool m_record_lines_p;
20778 /* The line number header. */
20779 line_header *m_line_header;
20781 /* These are part of the standard DWARF line number state machine,
20782 and initialized according to the DWARF spec. */
20784 unsigned char m_op_index = 0;
20785 /* The line table index (1-based) of the current file. */
20786 file_name_index m_file = (file_name_index) 1;
20787 unsigned int m_line = 1;
20789 /* These are initialized in the constructor. */
20791 CORE_ADDR m_address;
20793 unsigned int m_discriminator;
20795 /* Additional bits of state we need to track. */
20797 /* The last file that we called dwarf2_start_subfile for.
20798 This is only used for TLLs. */
20799 unsigned int m_last_file = 0;
20800 /* The last file a line number was recorded for. */
20801 struct subfile *m_last_subfile = NULL;
20803 /* When true, record the lines we decode. */
20804 bool m_currently_recording_lines = false;
20806 /* The last line number that was recorded, used to coalesce
20807 consecutive entries for the same line. This can happen, for
20808 example, when discriminators are present. PR 17276. */
20809 unsigned int m_last_line = 0;
20810 bool m_line_has_non_zero_discriminator = false;
20814 lnp_state_machine::handle_advance_pc (CORE_ADDR adjust)
20816 CORE_ADDR addr_adj = (((m_op_index + adjust)
20817 / m_line_header->maximum_ops_per_instruction)
20818 * m_line_header->minimum_instruction_length);
20819 m_address += gdbarch_adjust_dwarf2_line (m_gdbarch, addr_adj, true);
20820 m_op_index = ((m_op_index + adjust)
20821 % m_line_header->maximum_ops_per_instruction);
20825 lnp_state_machine::handle_special_opcode (unsigned char op_code)
20827 unsigned char adj_opcode = op_code - m_line_header->opcode_base;
20828 CORE_ADDR addr_adj = (((m_op_index
20829 + (adj_opcode / m_line_header->line_range))
20830 / m_line_header->maximum_ops_per_instruction)
20831 * m_line_header->minimum_instruction_length);
20832 m_address += gdbarch_adjust_dwarf2_line (m_gdbarch, addr_adj, true);
20833 m_op_index = ((m_op_index + (adj_opcode / m_line_header->line_range))
20834 % m_line_header->maximum_ops_per_instruction);
20836 int line_delta = (m_line_header->line_base
20837 + (adj_opcode % m_line_header->line_range));
20838 advance_line (line_delta);
20839 record_line (false);
20840 m_discriminator = 0;
20844 lnp_state_machine::handle_set_file (file_name_index file)
20848 const file_entry *fe = current_file ();
20850 dwarf2_debug_line_missing_file_complaint ();
20851 else if (m_record_lines_p)
20853 const char *dir = fe->include_dir (m_line_header);
20855 m_last_subfile = m_cu->get_builder ()->get_current_subfile ();
20856 m_line_has_non_zero_discriminator = m_discriminator != 0;
20857 dwarf2_start_subfile (m_cu, fe->name, dir);
20862 lnp_state_machine::handle_const_add_pc ()
20865 = (255 - m_line_header->opcode_base) / m_line_header->line_range;
20868 = (((m_op_index + adjust)
20869 / m_line_header->maximum_ops_per_instruction)
20870 * m_line_header->minimum_instruction_length);
20872 m_address += gdbarch_adjust_dwarf2_line (m_gdbarch, addr_adj, true);
20873 m_op_index = ((m_op_index + adjust)
20874 % m_line_header->maximum_ops_per_instruction);
20877 /* Return non-zero if we should add LINE to the line number table.
20878 LINE is the line to add, LAST_LINE is the last line that was added,
20879 LAST_SUBFILE is the subfile for LAST_LINE.
20880 LINE_HAS_NON_ZERO_DISCRIMINATOR is non-zero if LINE has ever
20881 had a non-zero discriminator.
20883 We have to be careful in the presence of discriminators.
20884 E.g., for this line:
20886 for (i = 0; i < 100000; i++);
20888 clang can emit four line number entries for that one line,
20889 each with a different discriminator.
20890 See gdb.dwarf2/dw2-single-line-discriminators.exp for an example.
20892 However, we want gdb to coalesce all four entries into one.
20893 Otherwise the user could stepi into the middle of the line and
20894 gdb would get confused about whether the pc really was in the
20895 middle of the line.
20897 Things are further complicated by the fact that two consecutive
20898 line number entries for the same line is a heuristic used by gcc
20899 to denote the end of the prologue. So we can't just discard duplicate
20900 entries, we have to be selective about it. The heuristic we use is
20901 that we only collapse consecutive entries for the same line if at least
20902 one of those entries has a non-zero discriminator. PR 17276.
20904 Note: Addresses in the line number state machine can never go backwards
20905 within one sequence, thus this coalescing is ok. */
20908 dwarf_record_line_p (struct dwarf2_cu *cu,
20909 unsigned int line, unsigned int last_line,
20910 int line_has_non_zero_discriminator,
20911 struct subfile *last_subfile)
20913 if (cu->get_builder ()->get_current_subfile () != last_subfile)
20915 if (line != last_line)
20917 /* Same line for the same file that we've seen already.
20918 As a last check, for pr 17276, only record the line if the line
20919 has never had a non-zero discriminator. */
20920 if (!line_has_non_zero_discriminator)
20925 /* Use the CU's builder to record line number LINE beginning at
20926 address ADDRESS in the line table of subfile SUBFILE. */
20929 dwarf_record_line_1 (struct gdbarch *gdbarch, struct subfile *subfile,
20930 unsigned int line, CORE_ADDR address,
20931 struct dwarf2_cu *cu)
20933 CORE_ADDR addr = gdbarch_addr_bits_remove (gdbarch, address);
20935 if (dwarf_line_debug)
20937 fprintf_unfiltered (gdb_stdlog,
20938 "Recording line %u, file %s, address %s\n",
20939 line, lbasename (subfile->name),
20940 paddress (gdbarch, address));
20944 cu->get_builder ()->record_line (subfile, line, addr);
20947 /* Subroutine of dwarf_decode_lines_1 to simplify it.
20948 Mark the end of a set of line number records.
20949 The arguments are the same as for dwarf_record_line_1.
20950 If SUBFILE is NULL the request is ignored. */
20953 dwarf_finish_line (struct gdbarch *gdbarch, struct subfile *subfile,
20954 CORE_ADDR address, struct dwarf2_cu *cu)
20956 if (subfile == NULL)
20959 if (dwarf_line_debug)
20961 fprintf_unfiltered (gdb_stdlog,
20962 "Finishing current line, file %s, address %s\n",
20963 lbasename (subfile->name),
20964 paddress (gdbarch, address));
20967 dwarf_record_line_1 (gdbarch, subfile, 0, address, cu);
20971 lnp_state_machine::record_line (bool end_sequence)
20973 if (dwarf_line_debug)
20975 fprintf_unfiltered (gdb_stdlog,
20976 "Processing actual line %u: file %u,"
20977 " address %s, is_stmt %u, discrim %u\n",
20978 m_line, to_underlying (m_file),
20979 paddress (m_gdbarch, m_address),
20980 m_is_stmt, m_discriminator);
20983 file_entry *fe = current_file ();
20986 dwarf2_debug_line_missing_file_complaint ();
20987 /* For now we ignore lines not starting on an instruction boundary.
20988 But not when processing end_sequence for compatibility with the
20989 previous version of the code. */
20990 else if (m_op_index == 0 || end_sequence)
20992 fe->included_p = 1;
20993 if (m_record_lines_p && (producer_is_codewarrior (m_cu) || m_is_stmt))
20995 if (m_last_subfile != m_cu->get_builder ()->get_current_subfile ()
20998 dwarf_finish_line (m_gdbarch, m_last_subfile, m_address,
20999 m_currently_recording_lines ? m_cu : nullptr);
21004 if (dwarf_record_line_p (m_cu, m_line, m_last_line,
21005 m_line_has_non_zero_discriminator,
21008 buildsym_compunit *builder = m_cu->get_builder ();
21009 dwarf_record_line_1 (m_gdbarch,
21010 builder->get_current_subfile (),
21012 m_currently_recording_lines ? m_cu : nullptr);
21014 m_last_subfile = m_cu->get_builder ()->get_current_subfile ();
21015 m_last_line = m_line;
21021 lnp_state_machine::lnp_state_machine (struct dwarf2_cu *cu, gdbarch *arch,
21022 line_header *lh, bool record_lines_p)
21026 m_record_lines_p = record_lines_p;
21027 m_line_header = lh;
21029 m_currently_recording_lines = true;
21031 /* Call `gdbarch_adjust_dwarf2_line' on the initial 0 address as if there
21032 was a line entry for it so that the backend has a chance to adjust it
21033 and also record it in case it needs it. This is currently used by MIPS
21034 code, cf. `mips_adjust_dwarf2_line'. */
21035 m_address = gdbarch_adjust_dwarf2_line (arch, 0, 0);
21036 m_is_stmt = lh->default_is_stmt;
21037 m_discriminator = 0;
21041 lnp_state_machine::check_line_address (struct dwarf2_cu *cu,
21042 const gdb_byte *line_ptr,
21043 CORE_ADDR unrelocated_lowpc, CORE_ADDR address)
21045 /* If ADDRESS < UNRELOCATED_LOWPC then it's not a usable value, it's outside
21046 the pc range of the CU. However, we restrict the test to only ADDRESS
21047 values of zero to preserve GDB's previous behaviour which is to handle
21048 the specific case of a function being GC'd by the linker. */
21050 if (address == 0 && address < unrelocated_lowpc)
21052 /* This line table is for a function which has been
21053 GCd by the linker. Ignore it. PR gdb/12528 */
21055 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
21056 long line_offset = line_ptr - get_debug_line_section (cu)->buffer;
21058 complaint (_(".debug_line address at offset 0x%lx is 0 [in module %s]"),
21059 line_offset, objfile_name (objfile));
21060 m_currently_recording_lines = false;
21061 /* Note: m_currently_recording_lines is left as false until we see
21062 DW_LNE_end_sequence. */
21066 /* Subroutine of dwarf_decode_lines to simplify it.
21067 Process the line number information in LH.
21068 If DECODE_FOR_PST_P is non-zero, all we do is process the line number
21069 program in order to set included_p for every referenced header. */
21072 dwarf_decode_lines_1 (struct line_header *lh, struct dwarf2_cu *cu,
21073 const int decode_for_pst_p, CORE_ADDR lowpc)
21075 const gdb_byte *line_ptr, *extended_end;
21076 const gdb_byte *line_end;
21077 unsigned int bytes_read, extended_len;
21078 unsigned char op_code, extended_op;
21079 CORE_ADDR baseaddr;
21080 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
21081 bfd *abfd = objfile->obfd;
21082 struct gdbarch *gdbarch = get_objfile_arch (objfile);
21083 /* True if we're recording line info (as opposed to building partial
21084 symtabs and just interested in finding include files mentioned by
21085 the line number program). */
21086 bool record_lines_p = !decode_for_pst_p;
21088 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
21090 line_ptr = lh->statement_program_start;
21091 line_end = lh->statement_program_end;
21093 /* Read the statement sequences until there's nothing left. */
21094 while (line_ptr < line_end)
21096 /* The DWARF line number program state machine. Reset the state
21097 machine at the start of each sequence. */
21098 lnp_state_machine state_machine (cu, gdbarch, lh, record_lines_p);
21099 bool end_sequence = false;
21101 if (record_lines_p)
21103 /* Start a subfile for the current file of the state
21105 const file_entry *fe = state_machine.current_file ();
21108 dwarf2_start_subfile (cu, fe->name, fe->include_dir (lh));
21111 /* Decode the table. */
21112 while (line_ptr < line_end && !end_sequence)
21114 op_code = read_1_byte (abfd, line_ptr);
21117 if (op_code >= lh->opcode_base)
21119 /* Special opcode. */
21120 state_machine.handle_special_opcode (op_code);
21122 else switch (op_code)
21124 case DW_LNS_extended_op:
21125 extended_len = read_unsigned_leb128 (abfd, line_ptr,
21127 line_ptr += bytes_read;
21128 extended_end = line_ptr + extended_len;
21129 extended_op = read_1_byte (abfd, line_ptr);
21131 switch (extended_op)
21133 case DW_LNE_end_sequence:
21134 state_machine.handle_end_sequence ();
21135 end_sequence = true;
21137 case DW_LNE_set_address:
21140 = read_address (abfd, line_ptr, cu, &bytes_read);
21141 line_ptr += bytes_read;
21143 state_machine.check_line_address (cu, line_ptr,
21144 lowpc - baseaddr, address);
21145 state_machine.handle_set_address (baseaddr, address);
21148 case DW_LNE_define_file:
21150 const char *cur_file;
21151 unsigned int mod_time, length;
21154 cur_file = read_direct_string (abfd, line_ptr,
21156 line_ptr += bytes_read;
21157 dindex = (dir_index)
21158 read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
21159 line_ptr += bytes_read;
21161 read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
21162 line_ptr += bytes_read;
21164 read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
21165 line_ptr += bytes_read;
21166 lh->add_file_name (cur_file, dindex, mod_time, length);
21169 case DW_LNE_set_discriminator:
21171 /* The discriminator is not interesting to the
21172 debugger; just ignore it. We still need to
21173 check its value though:
21174 if there are consecutive entries for the same
21175 (non-prologue) line we want to coalesce them.
21178 = read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
21179 line_ptr += bytes_read;
21181 state_machine.handle_set_discriminator (discr);
21185 complaint (_("mangled .debug_line section"));
21188 /* Make sure that we parsed the extended op correctly. If e.g.
21189 we expected a different address size than the producer used,
21190 we may have read the wrong number of bytes. */
21191 if (line_ptr != extended_end)
21193 complaint (_("mangled .debug_line section"));
21198 state_machine.handle_copy ();
21200 case DW_LNS_advance_pc:
21203 = read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
21204 line_ptr += bytes_read;
21206 state_machine.handle_advance_pc (adjust);
21209 case DW_LNS_advance_line:
21212 = read_signed_leb128 (abfd, line_ptr, &bytes_read);
21213 line_ptr += bytes_read;
21215 state_machine.handle_advance_line (line_delta);
21218 case DW_LNS_set_file:
21220 file_name_index file
21221 = (file_name_index) read_unsigned_leb128 (abfd, line_ptr,
21223 line_ptr += bytes_read;
21225 state_machine.handle_set_file (file);
21228 case DW_LNS_set_column:
21229 (void) read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
21230 line_ptr += bytes_read;
21232 case DW_LNS_negate_stmt:
21233 state_machine.handle_negate_stmt ();
21235 case DW_LNS_set_basic_block:
21237 /* Add to the address register of the state machine the
21238 address increment value corresponding to special opcode
21239 255. I.e., this value is scaled by the minimum
21240 instruction length since special opcode 255 would have
21241 scaled the increment. */
21242 case DW_LNS_const_add_pc:
21243 state_machine.handle_const_add_pc ();
21245 case DW_LNS_fixed_advance_pc:
21247 CORE_ADDR addr_adj = read_2_bytes (abfd, line_ptr);
21250 state_machine.handle_fixed_advance_pc (addr_adj);
21255 /* Unknown standard opcode, ignore it. */
21258 for (i = 0; i < lh->standard_opcode_lengths[op_code]; i++)
21260 (void) read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
21261 line_ptr += bytes_read;
21268 dwarf2_debug_line_missing_end_sequence_complaint ();
21270 /* We got a DW_LNE_end_sequence (or we ran off the end of the buffer,
21271 in which case we still finish recording the last line). */
21272 state_machine.record_line (true);
21276 /* Decode the Line Number Program (LNP) for the given line_header
21277 structure and CU. The actual information extracted and the type
21278 of structures created from the LNP depends on the value of PST.
21280 1. If PST is NULL, then this procedure uses the data from the program
21281 to create all necessary symbol tables, and their linetables.
21283 2. If PST is not NULL, this procedure reads the program to determine
21284 the list of files included by the unit represented by PST, and
21285 builds all the associated partial symbol tables.
21287 COMP_DIR is the compilation directory (DW_AT_comp_dir) or NULL if unknown.
21288 It is used for relative paths in the line table.
21289 NOTE: When processing partial symtabs (pst != NULL),
21290 comp_dir == pst->dirname.
21292 NOTE: It is important that psymtabs have the same file name (via strcmp)
21293 as the corresponding symtab. Since COMP_DIR is not used in the name of the
21294 symtab we don't use it in the name of the psymtabs we create.
21295 E.g. expand_line_sal requires this when finding psymtabs to expand.
21296 A good testcase for this is mb-inline.exp.
21298 LOWPC is the lowest address in CU (or 0 if not known).
21300 Boolean DECODE_MAPPING specifies we need to fully decode .debug_line
21301 for its PC<->lines mapping information. Otherwise only the filename
21302 table is read in. */
21305 dwarf_decode_lines (struct line_header *lh, const char *comp_dir,
21306 struct dwarf2_cu *cu, struct partial_symtab *pst,
21307 CORE_ADDR lowpc, int decode_mapping)
21309 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
21310 const int decode_for_pst_p = (pst != NULL);
21312 if (decode_mapping)
21313 dwarf_decode_lines_1 (lh, cu, decode_for_pst_p, lowpc);
21315 if (decode_for_pst_p)
21319 /* Now that we're done scanning the Line Header Program, we can
21320 create the psymtab of each included file. */
21321 for (file_index = 0; file_index < lh->file_names.size (); file_index++)
21322 if (lh->file_names[file_index].included_p == 1)
21324 gdb::unique_xmalloc_ptr<char> name_holder;
21325 const char *include_name =
21326 psymtab_include_file_name (lh, file_index, pst, comp_dir,
21328 if (include_name != NULL)
21329 dwarf2_create_include_psymtab (include_name, pst, objfile);
21334 /* Make sure a symtab is created for every file, even files
21335 which contain only variables (i.e. no code with associated
21337 buildsym_compunit *builder = cu->get_builder ();
21338 struct compunit_symtab *cust = builder->get_compunit_symtab ();
21341 for (i = 0; i < lh->file_names.size (); i++)
21343 file_entry &fe = lh->file_names[i];
21345 dwarf2_start_subfile (cu, fe.name, fe.include_dir (lh));
21347 if (builder->get_current_subfile ()->symtab == NULL)
21349 builder->get_current_subfile ()->symtab
21350 = allocate_symtab (cust,
21351 builder->get_current_subfile ()->name);
21353 fe.symtab = builder->get_current_subfile ()->symtab;
21358 /* Start a subfile for DWARF. FILENAME is the name of the file and
21359 DIRNAME the name of the source directory which contains FILENAME
21360 or NULL if not known.
21361 This routine tries to keep line numbers from identical absolute and
21362 relative file names in a common subfile.
21364 Using the `list' example from the GDB testsuite, which resides in
21365 /srcdir and compiling it with Irix6.2 cc in /compdir using a filename
21366 of /srcdir/list0.c yields the following debugging information for list0.c:
21368 DW_AT_name: /srcdir/list0.c
21369 DW_AT_comp_dir: /compdir
21370 files.files[0].name: list0.h
21371 files.files[0].dir: /srcdir
21372 files.files[1].name: list0.c
21373 files.files[1].dir: /srcdir
21375 The line number information for list0.c has to end up in a single
21376 subfile, so that `break /srcdir/list0.c:1' works as expected.
21377 start_subfile will ensure that this happens provided that we pass the
21378 concatenation of files.files[1].dir and files.files[1].name as the
21382 dwarf2_start_subfile (struct dwarf2_cu *cu, const char *filename,
21383 const char *dirname)
21387 /* In order not to lose the line information directory,
21388 we concatenate it to the filename when it makes sense.
21389 Note that the Dwarf3 standard says (speaking of filenames in line
21390 information): ``The directory index is ignored for file names
21391 that represent full path names''. Thus ignoring dirname in the
21392 `else' branch below isn't an issue. */
21394 if (!IS_ABSOLUTE_PATH (filename) && dirname != NULL)
21396 copy = concat (dirname, SLASH_STRING, filename, (char *)NULL);
21400 cu->get_builder ()->start_subfile (filename);
21406 /* Start a symtab for DWARF. NAME, COMP_DIR, LOW_PC are passed to the
21407 buildsym_compunit constructor. */
21409 struct compunit_symtab *
21410 dwarf2_cu::start_symtab (const char *name, const char *comp_dir,
21413 gdb_assert (m_builder == nullptr);
21415 m_builder.reset (new struct buildsym_compunit
21416 (per_cu->dwarf2_per_objfile->objfile,
21417 name, comp_dir, language, low_pc));
21419 list_in_scope = get_builder ()->get_file_symbols ();
21421 get_builder ()->record_debugformat ("DWARF 2");
21422 get_builder ()->record_producer (producer);
21424 processing_has_namespace_info = false;
21426 return get_builder ()->get_compunit_symtab ();
21430 var_decode_location (struct attribute *attr, struct symbol *sym,
21431 struct dwarf2_cu *cu)
21433 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
21434 struct comp_unit_head *cu_header = &cu->header;
21436 /* NOTE drow/2003-01-30: There used to be a comment and some special
21437 code here to turn a symbol with DW_AT_external and a
21438 SYMBOL_VALUE_ADDRESS of 0 into a LOC_UNRESOLVED symbol. This was
21439 necessary for platforms (maybe Alpha, certainly PowerPC GNU/Linux
21440 with some versions of binutils) where shared libraries could have
21441 relocations against symbols in their debug information - the
21442 minimal symbol would have the right address, but the debug info
21443 would not. It's no longer necessary, because we will explicitly
21444 apply relocations when we read in the debug information now. */
21446 /* A DW_AT_location attribute with no contents indicates that a
21447 variable has been optimized away. */
21448 if (attr_form_is_block (attr) && DW_BLOCK (attr)->size == 0)
21450 SYMBOL_ACLASS_INDEX (sym) = LOC_OPTIMIZED_OUT;
21454 /* Handle one degenerate form of location expression specially, to
21455 preserve GDB's previous behavior when section offsets are
21456 specified. If this is just a DW_OP_addr, DW_OP_addrx, or
21457 DW_OP_GNU_addr_index then mark this symbol as LOC_STATIC. */
21459 if (attr_form_is_block (attr)
21460 && ((DW_BLOCK (attr)->data[0] == DW_OP_addr
21461 && DW_BLOCK (attr)->size == 1 + cu_header->addr_size)
21462 || ((DW_BLOCK (attr)->data[0] == DW_OP_GNU_addr_index
21463 || DW_BLOCK (attr)->data[0] == DW_OP_addrx)
21464 && (DW_BLOCK (attr)->size
21465 == 1 + leb128_size (&DW_BLOCK (attr)->data[1])))))
21467 unsigned int dummy;
21469 if (DW_BLOCK (attr)->data[0] == DW_OP_addr)
21470 SYMBOL_VALUE_ADDRESS (sym) =
21471 read_address (objfile->obfd, DW_BLOCK (attr)->data + 1, cu, &dummy);
21473 SYMBOL_VALUE_ADDRESS (sym) =
21474 read_addr_index_from_leb128 (cu, DW_BLOCK (attr)->data + 1, &dummy);
21475 SYMBOL_ACLASS_INDEX (sym) = LOC_STATIC;
21476 fixup_symbol_section (sym, objfile);
21477 SYMBOL_VALUE_ADDRESS (sym) += ANOFFSET (objfile->section_offsets,
21478 SYMBOL_SECTION (sym));
21482 /* NOTE drow/2002-01-30: It might be worthwhile to have a static
21483 expression evaluator, and use LOC_COMPUTED only when necessary
21484 (i.e. when the value of a register or memory location is
21485 referenced, or a thread-local block, etc.). Then again, it might
21486 not be worthwhile. I'm assuming that it isn't unless performance
21487 or memory numbers show me otherwise. */
21489 dwarf2_symbol_mark_computed (attr, sym, cu, 0);
21491 if (SYMBOL_COMPUTED_OPS (sym)->location_has_loclist)
21492 cu->has_loclist = true;
21495 /* Given a pointer to a DWARF information entry, figure out if we need
21496 to make a symbol table entry for it, and if so, create a new entry
21497 and return a pointer to it.
21498 If TYPE is NULL, determine symbol type from the die, otherwise
21499 used the passed type.
21500 If SPACE is not NULL, use it to hold the new symbol. If it is
21501 NULL, allocate a new symbol on the objfile's obstack. */
21503 static struct symbol *
21504 new_symbol (struct die_info *die, struct type *type, struct dwarf2_cu *cu,
21505 struct symbol *space)
21507 struct dwarf2_per_objfile *dwarf2_per_objfile
21508 = cu->per_cu->dwarf2_per_objfile;
21509 struct objfile *objfile = dwarf2_per_objfile->objfile;
21510 struct gdbarch *gdbarch = get_objfile_arch (objfile);
21511 struct symbol *sym = NULL;
21513 struct attribute *attr = NULL;
21514 struct attribute *attr2 = NULL;
21515 CORE_ADDR baseaddr;
21516 struct pending **list_to_add = NULL;
21518 int inlined_func = (die->tag == DW_TAG_inlined_subroutine);
21520 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
21522 name = dwarf2_name (die, cu);
21525 const char *linkagename;
21526 int suppress_add = 0;
21531 sym = allocate_symbol (objfile);
21532 OBJSTAT (objfile, n_syms++);
21534 /* Cache this symbol's name and the name's demangled form (if any). */
21535 SYMBOL_SET_LANGUAGE (sym, cu->language, &objfile->objfile_obstack);
21536 linkagename = dwarf2_physname (name, die, cu);
21537 SYMBOL_SET_NAMES (sym, linkagename, strlen (linkagename), 0, objfile);
21539 /* Fortran does not have mangling standard and the mangling does differ
21540 between gfortran, iFort etc. */
21541 if (cu->language == language_fortran
21542 && symbol_get_demangled_name (&(sym->ginfo)) == NULL)
21543 symbol_set_demangled_name (&(sym->ginfo),
21544 dwarf2_full_name (name, die, cu),
21547 /* Default assumptions.
21548 Use the passed type or decode it from the die. */
21549 SYMBOL_DOMAIN (sym) = VAR_DOMAIN;
21550 SYMBOL_ACLASS_INDEX (sym) = LOC_OPTIMIZED_OUT;
21552 SYMBOL_TYPE (sym) = type;
21554 SYMBOL_TYPE (sym) = die_type (die, cu);
21555 attr = dwarf2_attr (die,
21556 inlined_func ? DW_AT_call_line : DW_AT_decl_line,
21560 SYMBOL_LINE (sym) = DW_UNSND (attr);
21563 attr = dwarf2_attr (die,
21564 inlined_func ? DW_AT_call_file : DW_AT_decl_file,
21568 file_name_index file_index = (file_name_index) DW_UNSND (attr);
21569 struct file_entry *fe;
21571 if (cu->line_header != NULL)
21572 fe = cu->line_header->file_name_at (file_index);
21577 complaint (_("file index out of range"));
21579 symbol_set_symtab (sym, fe->symtab);
21585 attr = dwarf2_attr (die, DW_AT_low_pc, cu);
21590 addr = attr_value_as_address (attr);
21591 addr = gdbarch_adjust_dwarf2_addr (gdbarch, addr + baseaddr);
21592 SYMBOL_VALUE_ADDRESS (sym) = addr;
21594 SYMBOL_TYPE (sym) = objfile_type (objfile)->builtin_core_addr;
21595 SYMBOL_DOMAIN (sym) = LABEL_DOMAIN;
21596 SYMBOL_ACLASS_INDEX (sym) = LOC_LABEL;
21597 add_symbol_to_list (sym, cu->list_in_scope);
21599 case DW_TAG_subprogram:
21600 /* SYMBOL_BLOCK_VALUE (sym) will be filled in later by
21602 SYMBOL_ACLASS_INDEX (sym) = LOC_BLOCK;
21603 attr2 = dwarf2_attr (die, DW_AT_external, cu);
21604 if ((attr2 && (DW_UNSND (attr2) != 0))
21605 || cu->language == language_ada)
21607 /* Subprograms marked external are stored as a global symbol.
21608 Ada subprograms, whether marked external or not, are always
21609 stored as a global symbol, because we want to be able to
21610 access them globally. For instance, we want to be able
21611 to break on a nested subprogram without having to
21612 specify the context. */
21613 list_to_add = cu->get_builder ()->get_global_symbols ();
21617 list_to_add = cu->list_in_scope;
21620 case DW_TAG_inlined_subroutine:
21621 /* SYMBOL_BLOCK_VALUE (sym) will be filled in later by
21623 SYMBOL_ACLASS_INDEX (sym) = LOC_BLOCK;
21624 SYMBOL_INLINED (sym) = 1;
21625 list_to_add = cu->list_in_scope;
21627 case DW_TAG_template_value_param:
21629 /* Fall through. */
21630 case DW_TAG_constant:
21631 case DW_TAG_variable:
21632 case DW_TAG_member:
21633 /* Compilation with minimal debug info may result in
21634 variables with missing type entries. Change the
21635 misleading `void' type to something sensible. */
21636 if (TYPE_CODE (SYMBOL_TYPE (sym)) == TYPE_CODE_VOID)
21637 SYMBOL_TYPE (sym) = objfile_type (objfile)->builtin_int;
21639 attr = dwarf2_attr (die, DW_AT_const_value, cu);
21640 /* In the case of DW_TAG_member, we should only be called for
21641 static const members. */
21642 if (die->tag == DW_TAG_member)
21644 /* dwarf2_add_field uses die_is_declaration,
21645 so we do the same. */
21646 gdb_assert (die_is_declaration (die, cu));
21651 dwarf2_const_value (attr, sym, cu);
21652 attr2 = dwarf2_attr (die, DW_AT_external, cu);
21655 if (attr2 && (DW_UNSND (attr2) != 0))
21656 list_to_add = cu->get_builder ()->get_global_symbols ();
21658 list_to_add = cu->list_in_scope;
21662 attr = dwarf2_attr (die, DW_AT_location, cu);
21665 var_decode_location (attr, sym, cu);
21666 attr2 = dwarf2_attr (die, DW_AT_external, cu);
21668 /* Fortran explicitly imports any global symbols to the local
21669 scope by DW_TAG_common_block. */
21670 if (cu->language == language_fortran && die->parent
21671 && die->parent->tag == DW_TAG_common_block)
21674 if (SYMBOL_CLASS (sym) == LOC_STATIC
21675 && SYMBOL_VALUE_ADDRESS (sym) == 0
21676 && !dwarf2_per_objfile->has_section_at_zero)
21678 /* When a static variable is eliminated by the linker,
21679 the corresponding debug information is not stripped
21680 out, but the variable address is set to null;
21681 do not add such variables into symbol table. */
21683 else if (attr2 && (DW_UNSND (attr2) != 0))
21685 /* Workaround gfortran PR debug/40040 - it uses
21686 DW_AT_location for variables in -fPIC libraries which may
21687 get overriden by other libraries/executable and get
21688 a different address. Resolve it by the minimal symbol
21689 which may come from inferior's executable using copy
21690 relocation. Make this workaround only for gfortran as for
21691 other compilers GDB cannot guess the minimal symbol
21692 Fortran mangling kind. */
21693 if (cu->language == language_fortran && die->parent
21694 && die->parent->tag == DW_TAG_module
21696 && startswith (cu->producer, "GNU Fortran"))
21697 SYMBOL_ACLASS_INDEX (sym) = LOC_UNRESOLVED;
21699 /* A variable with DW_AT_external is never static,
21700 but it may be block-scoped. */
21702 = ((cu->list_in_scope
21703 == cu->get_builder ()->get_file_symbols ())
21704 ? cu->get_builder ()->get_global_symbols ()
21705 : cu->list_in_scope);
21708 list_to_add = cu->list_in_scope;
21712 /* We do not know the address of this symbol.
21713 If it is an external symbol and we have type information
21714 for it, enter the symbol as a LOC_UNRESOLVED symbol.
21715 The address of the variable will then be determined from
21716 the minimal symbol table whenever the variable is
21718 attr2 = dwarf2_attr (die, DW_AT_external, cu);
21720 /* Fortran explicitly imports any global symbols to the local
21721 scope by DW_TAG_common_block. */
21722 if (cu->language == language_fortran && die->parent
21723 && die->parent->tag == DW_TAG_common_block)
21725 /* SYMBOL_CLASS doesn't matter here because
21726 read_common_block is going to reset it. */
21728 list_to_add = cu->list_in_scope;
21730 else if (attr2 && (DW_UNSND (attr2) != 0)
21731 && dwarf2_attr (die, DW_AT_type, cu) != NULL)
21733 /* A variable with DW_AT_external is never static, but it
21734 may be block-scoped. */
21736 = ((cu->list_in_scope
21737 == cu->get_builder ()->get_file_symbols ())
21738 ? cu->get_builder ()->get_global_symbols ()
21739 : cu->list_in_scope);
21741 SYMBOL_ACLASS_INDEX (sym) = LOC_UNRESOLVED;
21743 else if (!die_is_declaration (die, cu))
21745 /* Use the default LOC_OPTIMIZED_OUT class. */
21746 gdb_assert (SYMBOL_CLASS (sym) == LOC_OPTIMIZED_OUT);
21748 list_to_add = cu->list_in_scope;
21752 case DW_TAG_formal_parameter:
21754 /* If we are inside a function, mark this as an argument. If
21755 not, we might be looking at an argument to an inlined function
21756 when we do not have enough information to show inlined frames;
21757 pretend it's a local variable in that case so that the user can
21759 struct context_stack *curr
21760 = cu->get_builder ()->get_current_context_stack ();
21761 if (curr != nullptr && curr->name != nullptr)
21762 SYMBOL_IS_ARGUMENT (sym) = 1;
21763 attr = dwarf2_attr (die, DW_AT_location, cu);
21766 var_decode_location (attr, sym, cu);
21768 attr = dwarf2_attr (die, DW_AT_const_value, cu);
21771 dwarf2_const_value (attr, sym, cu);
21774 list_to_add = cu->list_in_scope;
21777 case DW_TAG_unspecified_parameters:
21778 /* From varargs functions; gdb doesn't seem to have any
21779 interest in this information, so just ignore it for now.
21782 case DW_TAG_template_type_param:
21784 /* Fall through. */
21785 case DW_TAG_class_type:
21786 case DW_TAG_interface_type:
21787 case DW_TAG_structure_type:
21788 case DW_TAG_union_type:
21789 case DW_TAG_set_type:
21790 case DW_TAG_enumeration_type:
21791 SYMBOL_ACLASS_INDEX (sym) = LOC_TYPEDEF;
21792 SYMBOL_DOMAIN (sym) = STRUCT_DOMAIN;
21795 /* NOTE: carlton/2003-11-10: C++ class symbols shouldn't
21796 really ever be static objects: otherwise, if you try
21797 to, say, break of a class's method and you're in a file
21798 which doesn't mention that class, it won't work unless
21799 the check for all static symbols in lookup_symbol_aux
21800 saves you. See the OtherFileClass tests in
21801 gdb.c++/namespace.exp. */
21805 buildsym_compunit *builder = cu->get_builder ();
21807 = (cu->list_in_scope == builder->get_file_symbols ()
21808 && cu->language == language_cplus
21809 ? builder->get_global_symbols ()
21810 : cu->list_in_scope);
21812 /* The semantics of C++ state that "struct foo {
21813 ... }" also defines a typedef for "foo". */
21814 if (cu->language == language_cplus
21815 || cu->language == language_ada
21816 || cu->language == language_d
21817 || cu->language == language_rust)
21819 /* The symbol's name is already allocated along
21820 with this objfile, so we don't need to
21821 duplicate it for the type. */
21822 if (TYPE_NAME (SYMBOL_TYPE (sym)) == 0)
21823 TYPE_NAME (SYMBOL_TYPE (sym)) = SYMBOL_SEARCH_NAME (sym);
21828 case DW_TAG_typedef:
21829 SYMBOL_ACLASS_INDEX (sym) = LOC_TYPEDEF;
21830 SYMBOL_DOMAIN (sym) = VAR_DOMAIN;
21831 list_to_add = cu->list_in_scope;
21833 case DW_TAG_base_type:
21834 case DW_TAG_subrange_type:
21835 SYMBOL_ACLASS_INDEX (sym) = LOC_TYPEDEF;
21836 SYMBOL_DOMAIN (sym) = VAR_DOMAIN;
21837 list_to_add = cu->list_in_scope;
21839 case DW_TAG_enumerator:
21840 attr = dwarf2_attr (die, DW_AT_const_value, cu);
21843 dwarf2_const_value (attr, sym, cu);
21846 /* NOTE: carlton/2003-11-10: See comment above in the
21847 DW_TAG_class_type, etc. block. */
21850 = (cu->list_in_scope == cu->get_builder ()->get_file_symbols ()
21851 && cu->language == language_cplus
21852 ? cu->get_builder ()->get_global_symbols ()
21853 : cu->list_in_scope);
21856 case DW_TAG_imported_declaration:
21857 case DW_TAG_namespace:
21858 SYMBOL_ACLASS_INDEX (sym) = LOC_TYPEDEF;
21859 list_to_add = cu->get_builder ()->get_global_symbols ();
21861 case DW_TAG_module:
21862 SYMBOL_ACLASS_INDEX (sym) = LOC_TYPEDEF;
21863 SYMBOL_DOMAIN (sym) = MODULE_DOMAIN;
21864 list_to_add = cu->get_builder ()->get_global_symbols ();
21866 case DW_TAG_common_block:
21867 SYMBOL_ACLASS_INDEX (sym) = LOC_COMMON_BLOCK;
21868 SYMBOL_DOMAIN (sym) = COMMON_BLOCK_DOMAIN;
21869 add_symbol_to_list (sym, cu->list_in_scope);
21872 /* Not a tag we recognize. Hopefully we aren't processing
21873 trash data, but since we must specifically ignore things
21874 we don't recognize, there is nothing else we should do at
21876 complaint (_("unsupported tag: '%s'"),
21877 dwarf_tag_name (die->tag));
21883 sym->hash_next = objfile->template_symbols;
21884 objfile->template_symbols = sym;
21885 list_to_add = NULL;
21888 if (list_to_add != NULL)
21889 add_symbol_to_list (sym, list_to_add);
21891 /* For the benefit of old versions of GCC, check for anonymous
21892 namespaces based on the demangled name. */
21893 if (!cu->processing_has_namespace_info
21894 && cu->language == language_cplus)
21895 cp_scan_for_anonymous_namespaces (cu->get_builder (), sym, objfile);
21900 /* Given an attr with a DW_FORM_dataN value in host byte order,
21901 zero-extend it as appropriate for the symbol's type. The DWARF
21902 standard (v4) is not entirely clear about the meaning of using
21903 DW_FORM_dataN for a constant with a signed type, where the type is
21904 wider than the data. The conclusion of a discussion on the DWARF
21905 list was that this is unspecified. We choose to always zero-extend
21906 because that is the interpretation long in use by GCC. */
21909 dwarf2_const_value_data (const struct attribute *attr, struct obstack *obstack,
21910 struct dwarf2_cu *cu, LONGEST *value, int bits)
21912 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
21913 enum bfd_endian byte_order = bfd_big_endian (objfile->obfd) ?
21914 BFD_ENDIAN_BIG : BFD_ENDIAN_LITTLE;
21915 LONGEST l = DW_UNSND (attr);
21917 if (bits < sizeof (*value) * 8)
21919 l &= ((LONGEST) 1 << bits) - 1;
21922 else if (bits == sizeof (*value) * 8)
21926 gdb_byte *bytes = (gdb_byte *) obstack_alloc (obstack, bits / 8);
21927 store_unsigned_integer (bytes, bits / 8, byte_order, l);
21934 /* Read a constant value from an attribute. Either set *VALUE, or if
21935 the value does not fit in *VALUE, set *BYTES - either already
21936 allocated on the objfile obstack, or newly allocated on OBSTACK,
21937 or, set *BATON, if we translated the constant to a location
21941 dwarf2_const_value_attr (const struct attribute *attr, struct type *type,
21942 const char *name, struct obstack *obstack,
21943 struct dwarf2_cu *cu,
21944 LONGEST *value, const gdb_byte **bytes,
21945 struct dwarf2_locexpr_baton **baton)
21947 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
21948 struct comp_unit_head *cu_header = &cu->header;
21949 struct dwarf_block *blk;
21950 enum bfd_endian byte_order = (bfd_big_endian (objfile->obfd) ?
21951 BFD_ENDIAN_BIG : BFD_ENDIAN_LITTLE);
21957 switch (attr->form)
21960 case DW_FORM_addrx:
21961 case DW_FORM_GNU_addr_index:
21965 if (TYPE_LENGTH (type) != cu_header->addr_size)
21966 dwarf2_const_value_length_mismatch_complaint (name,
21967 cu_header->addr_size,
21968 TYPE_LENGTH (type));
21969 /* Symbols of this form are reasonably rare, so we just
21970 piggyback on the existing location code rather than writing
21971 a new implementation of symbol_computed_ops. */
21972 *baton = XOBNEW (obstack, struct dwarf2_locexpr_baton);
21973 (*baton)->per_cu = cu->per_cu;
21974 gdb_assert ((*baton)->per_cu);
21976 (*baton)->size = 2 + cu_header->addr_size;
21977 data = (gdb_byte *) obstack_alloc (obstack, (*baton)->size);
21978 (*baton)->data = data;
21980 data[0] = DW_OP_addr;
21981 store_unsigned_integer (&data[1], cu_header->addr_size,
21982 byte_order, DW_ADDR (attr));
21983 data[cu_header->addr_size + 1] = DW_OP_stack_value;
21986 case DW_FORM_string:
21989 case DW_FORM_GNU_str_index:
21990 case DW_FORM_GNU_strp_alt:
21991 /* DW_STRING is already allocated on the objfile obstack, point
21993 *bytes = (const gdb_byte *) DW_STRING (attr);
21995 case DW_FORM_block1:
21996 case DW_FORM_block2:
21997 case DW_FORM_block4:
21998 case DW_FORM_block:
21999 case DW_FORM_exprloc:
22000 case DW_FORM_data16:
22001 blk = DW_BLOCK (attr);
22002 if (TYPE_LENGTH (type) != blk->size)
22003 dwarf2_const_value_length_mismatch_complaint (name, blk->size,
22004 TYPE_LENGTH (type));
22005 *bytes = blk->data;
22008 /* The DW_AT_const_value attributes are supposed to carry the
22009 symbol's value "represented as it would be on the target
22010 architecture." By the time we get here, it's already been
22011 converted to host endianness, so we just need to sign- or
22012 zero-extend it as appropriate. */
22013 case DW_FORM_data1:
22014 *bytes = dwarf2_const_value_data (attr, obstack, cu, value, 8);
22016 case DW_FORM_data2:
22017 *bytes = dwarf2_const_value_data (attr, obstack, cu, value, 16);
22019 case DW_FORM_data4:
22020 *bytes = dwarf2_const_value_data (attr, obstack, cu, value, 32);
22022 case DW_FORM_data8:
22023 *bytes = dwarf2_const_value_data (attr, obstack, cu, value, 64);
22026 case DW_FORM_sdata:
22027 case DW_FORM_implicit_const:
22028 *value = DW_SND (attr);
22031 case DW_FORM_udata:
22032 *value = DW_UNSND (attr);
22036 complaint (_("unsupported const value attribute form: '%s'"),
22037 dwarf_form_name (attr->form));
22044 /* Copy constant value from an attribute to a symbol. */
22047 dwarf2_const_value (const struct attribute *attr, struct symbol *sym,
22048 struct dwarf2_cu *cu)
22050 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
22052 const gdb_byte *bytes;
22053 struct dwarf2_locexpr_baton *baton;
22055 dwarf2_const_value_attr (attr, SYMBOL_TYPE (sym),
22056 SYMBOL_PRINT_NAME (sym),
22057 &objfile->objfile_obstack, cu,
22058 &value, &bytes, &baton);
22062 SYMBOL_LOCATION_BATON (sym) = baton;
22063 SYMBOL_ACLASS_INDEX (sym) = dwarf2_locexpr_index;
22065 else if (bytes != NULL)
22067 SYMBOL_VALUE_BYTES (sym) = bytes;
22068 SYMBOL_ACLASS_INDEX (sym) = LOC_CONST_BYTES;
22072 SYMBOL_VALUE (sym) = value;
22073 SYMBOL_ACLASS_INDEX (sym) = LOC_CONST;
22077 /* Return the type of the die in question using its DW_AT_type attribute. */
22079 static struct type *
22080 die_type (struct die_info *die, struct dwarf2_cu *cu)
22082 struct attribute *type_attr;
22084 type_attr = dwarf2_attr (die, DW_AT_type, cu);
22087 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
22088 /* A missing DW_AT_type represents a void type. */
22089 return objfile_type (objfile)->builtin_void;
22092 return lookup_die_type (die, type_attr, cu);
22095 /* True iff CU's producer generates GNAT Ada auxiliary information
22096 that allows to find parallel types through that information instead
22097 of having to do expensive parallel lookups by type name. */
22100 need_gnat_info (struct dwarf2_cu *cu)
22102 /* Assume that the Ada compiler was GNAT, which always produces
22103 the auxiliary information. */
22104 return (cu->language == language_ada);
22107 /* Return the auxiliary type of the die in question using its
22108 DW_AT_GNAT_descriptive_type attribute. Returns NULL if the
22109 attribute is not present. */
22111 static struct type *
22112 die_descriptive_type (struct die_info *die, struct dwarf2_cu *cu)
22114 struct attribute *type_attr;
22116 type_attr = dwarf2_attr (die, DW_AT_GNAT_descriptive_type, cu);
22120 return lookup_die_type (die, type_attr, cu);
22123 /* If DIE has a descriptive_type attribute, then set the TYPE's
22124 descriptive type accordingly. */
22127 set_descriptive_type (struct type *type, struct die_info *die,
22128 struct dwarf2_cu *cu)
22130 struct type *descriptive_type = die_descriptive_type (die, cu);
22132 if (descriptive_type)
22134 ALLOCATE_GNAT_AUX_TYPE (type);
22135 TYPE_DESCRIPTIVE_TYPE (type) = descriptive_type;
22139 /* Return the containing type of the die in question using its
22140 DW_AT_containing_type attribute. */
22142 static struct type *
22143 die_containing_type (struct die_info *die, struct dwarf2_cu *cu)
22145 struct attribute *type_attr;
22146 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
22148 type_attr = dwarf2_attr (die, DW_AT_containing_type, cu);
22150 error (_("Dwarf Error: Problem turning containing type into gdb type "
22151 "[in module %s]"), objfile_name (objfile));
22153 return lookup_die_type (die, type_attr, cu);
22156 /* Return an error marker type to use for the ill formed type in DIE/CU. */
22158 static struct type *
22159 build_error_marker_type (struct dwarf2_cu *cu, struct die_info *die)
22161 struct dwarf2_per_objfile *dwarf2_per_objfile
22162 = cu->per_cu->dwarf2_per_objfile;
22163 struct objfile *objfile = dwarf2_per_objfile->objfile;
22166 std::string message
22167 = string_printf (_("<unknown type in %s, CU %s, DIE %s>"),
22168 objfile_name (objfile),
22169 sect_offset_str (cu->header.sect_off),
22170 sect_offset_str (die->sect_off));
22171 saved = (char *) obstack_copy0 (&objfile->objfile_obstack,
22172 message.c_str (), message.length ());
22174 return init_type (objfile, TYPE_CODE_ERROR, 0, saved);
22177 /* Look up the type of DIE in CU using its type attribute ATTR.
22178 ATTR must be one of: DW_AT_type, DW_AT_GNAT_descriptive_type,
22179 DW_AT_containing_type.
22180 If there is no type substitute an error marker. */
22182 static struct type *
22183 lookup_die_type (struct die_info *die, const struct attribute *attr,
22184 struct dwarf2_cu *cu)
22186 struct dwarf2_per_objfile *dwarf2_per_objfile
22187 = cu->per_cu->dwarf2_per_objfile;
22188 struct objfile *objfile = dwarf2_per_objfile->objfile;
22189 struct type *this_type;
22191 gdb_assert (attr->name == DW_AT_type
22192 || attr->name == DW_AT_GNAT_descriptive_type
22193 || attr->name == DW_AT_containing_type);
22195 /* First see if we have it cached. */
22197 if (attr->form == DW_FORM_GNU_ref_alt)
22199 struct dwarf2_per_cu_data *per_cu;
22200 sect_offset sect_off = dwarf2_get_ref_die_offset (attr);
22202 per_cu = dwarf2_find_containing_comp_unit (sect_off, 1,
22203 dwarf2_per_objfile);
22204 this_type = get_die_type_at_offset (sect_off, per_cu);
22206 else if (attr_form_is_ref (attr))
22208 sect_offset sect_off = dwarf2_get_ref_die_offset (attr);
22210 this_type = get_die_type_at_offset (sect_off, cu->per_cu);
22212 else if (attr->form == DW_FORM_ref_sig8)
22214 ULONGEST signature = DW_SIGNATURE (attr);
22216 return get_signatured_type (die, signature, cu);
22220 complaint (_("Dwarf Error: Bad type attribute %s in DIE"
22221 " at %s [in module %s]"),
22222 dwarf_attr_name (attr->name), sect_offset_str (die->sect_off),
22223 objfile_name (objfile));
22224 return build_error_marker_type (cu, die);
22227 /* If not cached we need to read it in. */
22229 if (this_type == NULL)
22231 struct die_info *type_die = NULL;
22232 struct dwarf2_cu *type_cu = cu;
22234 if (attr_form_is_ref (attr))
22235 type_die = follow_die_ref (die, attr, &type_cu);
22236 if (type_die == NULL)
22237 return build_error_marker_type (cu, die);
22238 /* If we find the type now, it's probably because the type came
22239 from an inter-CU reference and the type's CU got expanded before
22241 this_type = read_type_die (type_die, type_cu);
22244 /* If we still don't have a type use an error marker. */
22246 if (this_type == NULL)
22247 return build_error_marker_type (cu, die);
22252 /* Return the type in DIE, CU.
22253 Returns NULL for invalid types.
22255 This first does a lookup in die_type_hash,
22256 and only reads the die in if necessary.
22258 NOTE: This can be called when reading in partial or full symbols. */
22260 static struct type *
22261 read_type_die (struct die_info *die, struct dwarf2_cu *cu)
22263 struct type *this_type;
22265 this_type = get_die_type (die, cu);
22269 return read_type_die_1 (die, cu);
22272 /* Read the type in DIE, CU.
22273 Returns NULL for invalid types. */
22275 static struct type *
22276 read_type_die_1 (struct die_info *die, struct dwarf2_cu *cu)
22278 struct type *this_type = NULL;
22282 case DW_TAG_class_type:
22283 case DW_TAG_interface_type:
22284 case DW_TAG_structure_type:
22285 case DW_TAG_union_type:
22286 this_type = read_structure_type (die, cu);
22288 case DW_TAG_enumeration_type:
22289 this_type = read_enumeration_type (die, cu);
22291 case DW_TAG_subprogram:
22292 case DW_TAG_subroutine_type:
22293 case DW_TAG_inlined_subroutine:
22294 this_type = read_subroutine_type (die, cu);
22296 case DW_TAG_array_type:
22297 this_type = read_array_type (die, cu);
22299 case DW_TAG_set_type:
22300 this_type = read_set_type (die, cu);
22302 case DW_TAG_pointer_type:
22303 this_type = read_tag_pointer_type (die, cu);
22305 case DW_TAG_ptr_to_member_type:
22306 this_type = read_tag_ptr_to_member_type (die, cu);
22308 case DW_TAG_reference_type:
22309 this_type = read_tag_reference_type (die, cu, TYPE_CODE_REF);
22311 case DW_TAG_rvalue_reference_type:
22312 this_type = read_tag_reference_type (die, cu, TYPE_CODE_RVALUE_REF);
22314 case DW_TAG_const_type:
22315 this_type = read_tag_const_type (die, cu);
22317 case DW_TAG_volatile_type:
22318 this_type = read_tag_volatile_type (die, cu);
22320 case DW_TAG_restrict_type:
22321 this_type = read_tag_restrict_type (die, cu);
22323 case DW_TAG_string_type:
22324 this_type = read_tag_string_type (die, cu);
22326 case DW_TAG_typedef:
22327 this_type = read_typedef (die, cu);
22329 case DW_TAG_subrange_type:
22330 this_type = read_subrange_type (die, cu);
22332 case DW_TAG_base_type:
22333 this_type = read_base_type (die, cu);
22335 case DW_TAG_unspecified_type:
22336 this_type = read_unspecified_type (die, cu);
22338 case DW_TAG_namespace:
22339 this_type = read_namespace_type (die, cu);
22341 case DW_TAG_module:
22342 this_type = read_module_type (die, cu);
22344 case DW_TAG_atomic_type:
22345 this_type = read_tag_atomic_type (die, cu);
22348 complaint (_("unexpected tag in read_type_die: '%s'"),
22349 dwarf_tag_name (die->tag));
22356 /* See if we can figure out if the class lives in a namespace. We do
22357 this by looking for a member function; its demangled name will
22358 contain namespace info, if there is any.
22359 Return the computed name or NULL.
22360 Space for the result is allocated on the objfile's obstack.
22361 This is the full-die version of guess_partial_die_structure_name.
22362 In this case we know DIE has no useful parent. */
22365 guess_full_die_structure_name (struct die_info *die, struct dwarf2_cu *cu)
22367 struct die_info *spec_die;
22368 struct dwarf2_cu *spec_cu;
22369 struct die_info *child;
22370 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
22373 spec_die = die_specification (die, &spec_cu);
22374 if (spec_die != NULL)
22380 for (child = die->child;
22382 child = child->sibling)
22384 if (child->tag == DW_TAG_subprogram)
22386 const char *linkage_name = dw2_linkage_name (child, cu);
22388 if (linkage_name != NULL)
22391 = language_class_name_from_physname (cu->language_defn,
22395 if (actual_name != NULL)
22397 const char *die_name = dwarf2_name (die, cu);
22399 if (die_name != NULL
22400 && strcmp (die_name, actual_name) != 0)
22402 /* Strip off the class name from the full name.
22403 We want the prefix. */
22404 int die_name_len = strlen (die_name);
22405 int actual_name_len = strlen (actual_name);
22407 /* Test for '::' as a sanity check. */
22408 if (actual_name_len > die_name_len + 2
22409 && actual_name[actual_name_len
22410 - die_name_len - 1] == ':')
22411 name = (char *) obstack_copy0 (
22412 &objfile->per_bfd->storage_obstack,
22413 actual_name, actual_name_len - die_name_len - 2);
22416 xfree (actual_name);
22425 /* GCC might emit a nameless typedef that has a linkage name. Determine the
22426 prefix part in such case. See
22427 http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47510. */
22429 static const char *
22430 anonymous_struct_prefix (struct die_info *die, struct dwarf2_cu *cu)
22432 struct attribute *attr;
22435 if (die->tag != DW_TAG_class_type && die->tag != DW_TAG_interface_type
22436 && die->tag != DW_TAG_structure_type && die->tag != DW_TAG_union_type)
22439 if (dwarf2_string_attr (die, DW_AT_name, cu) != NULL)
22442 attr = dw2_linkage_name_attr (die, cu);
22443 if (attr == NULL || DW_STRING (attr) == NULL)
22446 /* dwarf2_name had to be already called. */
22447 gdb_assert (DW_STRING_IS_CANONICAL (attr));
22449 /* Strip the base name, keep any leading namespaces/classes. */
22450 base = strrchr (DW_STRING (attr), ':');
22451 if (base == NULL || base == DW_STRING (attr) || base[-1] != ':')
22454 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
22455 return (char *) obstack_copy0 (&objfile->per_bfd->storage_obstack,
22457 &base[-1] - DW_STRING (attr));
22460 /* Return the name of the namespace/class that DIE is defined within,
22461 or "" if we can't tell. The caller should not xfree the result.
22463 For example, if we're within the method foo() in the following
22473 then determine_prefix on foo's die will return "N::C". */
22475 static const char *
22476 determine_prefix (struct die_info *die, struct dwarf2_cu *cu)
22478 struct dwarf2_per_objfile *dwarf2_per_objfile
22479 = cu->per_cu->dwarf2_per_objfile;
22480 struct die_info *parent, *spec_die;
22481 struct dwarf2_cu *spec_cu;
22482 struct type *parent_type;
22483 const char *retval;
22485 if (cu->language != language_cplus
22486 && cu->language != language_fortran && cu->language != language_d
22487 && cu->language != language_rust)
22490 retval = anonymous_struct_prefix (die, cu);
22494 /* We have to be careful in the presence of DW_AT_specification.
22495 For example, with GCC 3.4, given the code
22499 // Definition of N::foo.
22503 then we'll have a tree of DIEs like this:
22505 1: DW_TAG_compile_unit
22506 2: DW_TAG_namespace // N
22507 3: DW_TAG_subprogram // declaration of N::foo
22508 4: DW_TAG_subprogram // definition of N::foo
22509 DW_AT_specification // refers to die #3
22511 Thus, when processing die #4, we have to pretend that we're in
22512 the context of its DW_AT_specification, namely the contex of die
22515 spec_die = die_specification (die, &spec_cu);
22516 if (spec_die == NULL)
22517 parent = die->parent;
22520 parent = spec_die->parent;
22524 if (parent == NULL)
22526 else if (parent->building_fullname)
22529 const char *parent_name;
22531 /* It has been seen on RealView 2.2 built binaries,
22532 DW_TAG_template_type_param types actually _defined_ as
22533 children of the parent class:
22536 template class <class Enum> Class{};
22537 Class<enum E> class_e;
22539 1: DW_TAG_class_type (Class)
22540 2: DW_TAG_enumeration_type (E)
22541 3: DW_TAG_enumerator (enum1:0)
22542 3: DW_TAG_enumerator (enum2:1)
22544 2: DW_TAG_template_type_param
22545 DW_AT_type DW_FORM_ref_udata (E)
22547 Besides being broken debug info, it can put GDB into an
22548 infinite loop. Consider:
22550 When we're building the full name for Class<E>, we'll start
22551 at Class, and go look over its template type parameters,
22552 finding E. We'll then try to build the full name of E, and
22553 reach here. We're now trying to build the full name of E,
22554 and look over the parent DIE for containing scope. In the
22555 broken case, if we followed the parent DIE of E, we'd again
22556 find Class, and once again go look at its template type
22557 arguments, etc., etc. Simply don't consider such parent die
22558 as source-level parent of this die (it can't be, the language
22559 doesn't allow it), and break the loop here. */
22560 name = dwarf2_name (die, cu);
22561 parent_name = dwarf2_name (parent, cu);
22562 complaint (_("template param type '%s' defined within parent '%s'"),
22563 name ? name : "<unknown>",
22564 parent_name ? parent_name : "<unknown>");
22568 switch (parent->tag)
22570 case DW_TAG_namespace:
22571 parent_type = read_type_die (parent, cu);
22572 /* GCC 4.0 and 4.1 had a bug (PR c++/28460) where they generated bogus
22573 DW_TAG_namespace DIEs with a name of "::" for the global namespace.
22574 Work around this problem here. */
22575 if (cu->language == language_cplus
22576 && strcmp (TYPE_NAME (parent_type), "::") == 0)
22578 /* We give a name to even anonymous namespaces. */
22579 return TYPE_NAME (parent_type);
22580 case DW_TAG_class_type:
22581 case DW_TAG_interface_type:
22582 case DW_TAG_structure_type:
22583 case DW_TAG_union_type:
22584 case DW_TAG_module:
22585 parent_type = read_type_die (parent, cu);
22586 if (TYPE_NAME (parent_type) != NULL)
22587 return TYPE_NAME (parent_type);
22589 /* An anonymous structure is only allowed non-static data
22590 members; no typedefs, no member functions, et cetera.
22591 So it does not need a prefix. */
22593 case DW_TAG_compile_unit:
22594 case DW_TAG_partial_unit:
22595 /* gcc-4.5 -gdwarf-4 can drop the enclosing namespace. Cope. */
22596 if (cu->language == language_cplus
22597 && !VEC_empty (dwarf2_section_info_def, dwarf2_per_objfile->types)
22598 && die->child != NULL
22599 && (die->tag == DW_TAG_class_type
22600 || die->tag == DW_TAG_structure_type
22601 || die->tag == DW_TAG_union_type))
22603 char *name = guess_full_die_structure_name (die, cu);
22608 case DW_TAG_enumeration_type:
22609 parent_type = read_type_die (parent, cu);
22610 if (TYPE_DECLARED_CLASS (parent_type))
22612 if (TYPE_NAME (parent_type) != NULL)
22613 return TYPE_NAME (parent_type);
22616 /* Fall through. */
22618 return determine_prefix (parent, cu);
22622 /* Return a newly-allocated string formed by concatenating PREFIX and SUFFIX
22623 with appropriate separator. If PREFIX or SUFFIX is NULL or empty, then
22624 simply copy the SUFFIX or PREFIX, respectively. If OBS is non-null, perform
22625 an obconcat, otherwise allocate storage for the result. The CU argument is
22626 used to determine the language and hence, the appropriate separator. */
22628 #define MAX_SEP_LEN 7 /* strlen ("__") + strlen ("_MOD_") */
22631 typename_concat (struct obstack *obs, const char *prefix, const char *suffix,
22632 int physname, struct dwarf2_cu *cu)
22634 const char *lead = "";
22637 if (suffix == NULL || suffix[0] == '\0'
22638 || prefix == NULL || prefix[0] == '\0')
22640 else if (cu->language == language_d)
22642 /* For D, the 'main' function could be defined in any module, but it
22643 should never be prefixed. */
22644 if (strcmp (suffix, "D main") == 0)
22652 else if (cu->language == language_fortran && physname)
22654 /* This is gfortran specific mangling. Normally DW_AT_linkage_name or
22655 DW_AT_MIPS_linkage_name is preferred and used instead. */
22663 if (prefix == NULL)
22665 if (suffix == NULL)
22672 xmalloc (strlen (prefix) + MAX_SEP_LEN + strlen (suffix) + 1));
22674 strcpy (retval, lead);
22675 strcat (retval, prefix);
22676 strcat (retval, sep);
22677 strcat (retval, suffix);
22682 /* We have an obstack. */
22683 return obconcat (obs, lead, prefix, sep, suffix, (char *) NULL);
22687 /* Return sibling of die, NULL if no sibling. */
22689 static struct die_info *
22690 sibling_die (struct die_info *die)
22692 return die->sibling;
22695 /* Get name of a die, return NULL if not found. */
22697 static const char *
22698 dwarf2_canonicalize_name (const char *name, struct dwarf2_cu *cu,
22699 struct obstack *obstack)
22701 if (name && cu->language == language_cplus)
22703 std::string canon_name = cp_canonicalize_string (name);
22705 if (!canon_name.empty ())
22707 if (canon_name != name)
22708 name = (const char *) obstack_copy0 (obstack,
22709 canon_name.c_str (),
22710 canon_name.length ());
22717 /* Get name of a die, return NULL if not found.
22718 Anonymous namespaces are converted to their magic string. */
22720 static const char *
22721 dwarf2_name (struct die_info *die, struct dwarf2_cu *cu)
22723 struct attribute *attr;
22724 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
22726 attr = dwarf2_attr (die, DW_AT_name, cu);
22727 if ((!attr || !DW_STRING (attr))
22728 && die->tag != DW_TAG_namespace
22729 && die->tag != DW_TAG_class_type
22730 && die->tag != DW_TAG_interface_type
22731 && die->tag != DW_TAG_structure_type
22732 && die->tag != DW_TAG_union_type)
22737 case DW_TAG_compile_unit:
22738 case DW_TAG_partial_unit:
22739 /* Compilation units have a DW_AT_name that is a filename, not
22740 a source language identifier. */
22741 case DW_TAG_enumeration_type:
22742 case DW_TAG_enumerator:
22743 /* These tags always have simple identifiers already; no need
22744 to canonicalize them. */
22745 return DW_STRING (attr);
22747 case DW_TAG_namespace:
22748 if (attr != NULL && DW_STRING (attr) != NULL)
22749 return DW_STRING (attr);
22750 return CP_ANONYMOUS_NAMESPACE_STR;
22752 case DW_TAG_class_type:
22753 case DW_TAG_interface_type:
22754 case DW_TAG_structure_type:
22755 case DW_TAG_union_type:
22756 /* Some GCC versions emit spurious DW_AT_name attributes for unnamed
22757 structures or unions. These were of the form "._%d" in GCC 4.1,
22758 or simply "<anonymous struct>" or "<anonymous union>" in GCC 4.3
22759 and GCC 4.4. We work around this problem by ignoring these. */
22760 if (attr && DW_STRING (attr)
22761 && (startswith (DW_STRING (attr), "._")
22762 || startswith (DW_STRING (attr), "<anonymous")))
22765 /* GCC might emit a nameless typedef that has a linkage name. See
22766 http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47510. */
22767 if (!attr || DW_STRING (attr) == NULL)
22769 char *demangled = NULL;
22771 attr = dw2_linkage_name_attr (die, cu);
22772 if (attr == NULL || DW_STRING (attr) == NULL)
22775 /* Avoid demangling DW_STRING (attr) the second time on a second
22776 call for the same DIE. */
22777 if (!DW_STRING_IS_CANONICAL (attr))
22778 demangled = gdb_demangle (DW_STRING (attr), DMGL_TYPES);
22784 /* FIXME: we already did this for the partial symbol... */
22787 obstack_copy0 (&objfile->per_bfd->storage_obstack,
22788 demangled, strlen (demangled)));
22789 DW_STRING_IS_CANONICAL (attr) = 1;
22792 /* Strip any leading namespaces/classes, keep only the base name.
22793 DW_AT_name for named DIEs does not contain the prefixes. */
22794 base = strrchr (DW_STRING (attr), ':');
22795 if (base && base > DW_STRING (attr) && base[-1] == ':')
22798 return DW_STRING (attr);
22807 if (!DW_STRING_IS_CANONICAL (attr))
22810 = dwarf2_canonicalize_name (DW_STRING (attr), cu,
22811 &objfile->per_bfd->storage_obstack);
22812 DW_STRING_IS_CANONICAL (attr) = 1;
22814 return DW_STRING (attr);
22817 /* Return the die that this die in an extension of, or NULL if there
22818 is none. *EXT_CU is the CU containing DIE on input, and the CU
22819 containing the return value on output. */
22821 static struct die_info *
22822 dwarf2_extension (struct die_info *die, struct dwarf2_cu **ext_cu)
22824 struct attribute *attr;
22826 attr = dwarf2_attr (die, DW_AT_extension, *ext_cu);
22830 return follow_die_ref (die, attr, ext_cu);
22833 /* A convenience function that returns an "unknown" DWARF name,
22834 including the value of V. STR is the name of the entity being
22835 printed, e.g., "TAG". */
22837 static const char *
22838 dwarf_unknown (const char *str, unsigned v)
22840 char *cell = get_print_cell ();
22841 xsnprintf (cell, PRINT_CELL_SIZE, "DW_%s_<unknown: %u>", str, v);
22845 /* Convert a DIE tag into its string name. */
22847 static const char *
22848 dwarf_tag_name (unsigned tag)
22850 const char *name = get_DW_TAG_name (tag);
22853 return dwarf_unknown ("TAG", tag);
22858 /* Convert a DWARF attribute code into its string name. */
22860 static const char *
22861 dwarf_attr_name (unsigned attr)
22865 #ifdef MIPS /* collides with DW_AT_HP_block_index */
22866 if (attr == DW_AT_MIPS_fde)
22867 return "DW_AT_MIPS_fde";
22869 if (attr == DW_AT_HP_block_index)
22870 return "DW_AT_HP_block_index";
22873 name = get_DW_AT_name (attr);
22876 return dwarf_unknown ("AT", attr);
22881 /* Convert a DWARF value form code into its string name. */
22883 static const char *
22884 dwarf_form_name (unsigned form)
22886 const char *name = get_DW_FORM_name (form);
22889 return dwarf_unknown ("FORM", form);
22894 static const char *
22895 dwarf_bool_name (unsigned mybool)
22903 /* Convert a DWARF type code into its string name. */
22905 static const char *
22906 dwarf_type_encoding_name (unsigned enc)
22908 const char *name = get_DW_ATE_name (enc);
22911 return dwarf_unknown ("ATE", enc);
22917 dump_die_shallow (struct ui_file *f, int indent, struct die_info *die)
22921 print_spaces (indent, f);
22922 fprintf_unfiltered (f, "Die: %s (abbrev %d, offset %s)\n",
22923 dwarf_tag_name (die->tag), die->abbrev,
22924 sect_offset_str (die->sect_off));
22926 if (die->parent != NULL)
22928 print_spaces (indent, f);
22929 fprintf_unfiltered (f, " parent at offset: %s\n",
22930 sect_offset_str (die->parent->sect_off));
22933 print_spaces (indent, f);
22934 fprintf_unfiltered (f, " has children: %s\n",
22935 dwarf_bool_name (die->child != NULL));
22937 print_spaces (indent, f);
22938 fprintf_unfiltered (f, " attributes:\n");
22940 for (i = 0; i < die->num_attrs; ++i)
22942 print_spaces (indent, f);
22943 fprintf_unfiltered (f, " %s (%s) ",
22944 dwarf_attr_name (die->attrs[i].name),
22945 dwarf_form_name (die->attrs[i].form));
22947 switch (die->attrs[i].form)
22950 case DW_FORM_addrx:
22951 case DW_FORM_GNU_addr_index:
22952 fprintf_unfiltered (f, "address: ");
22953 fputs_filtered (hex_string (DW_ADDR (&die->attrs[i])), f);
22955 case DW_FORM_block2:
22956 case DW_FORM_block4:
22957 case DW_FORM_block:
22958 case DW_FORM_block1:
22959 fprintf_unfiltered (f, "block: size %s",
22960 pulongest (DW_BLOCK (&die->attrs[i])->size));
22962 case DW_FORM_exprloc:
22963 fprintf_unfiltered (f, "expression: size %s",
22964 pulongest (DW_BLOCK (&die->attrs[i])->size));
22966 case DW_FORM_data16:
22967 fprintf_unfiltered (f, "constant of 16 bytes");
22969 case DW_FORM_ref_addr:
22970 fprintf_unfiltered (f, "ref address: ");
22971 fputs_filtered (hex_string (DW_UNSND (&die->attrs[i])), f);
22973 case DW_FORM_GNU_ref_alt:
22974 fprintf_unfiltered (f, "alt ref address: ");
22975 fputs_filtered (hex_string (DW_UNSND (&die->attrs[i])), f);
22981 case DW_FORM_ref_udata:
22982 fprintf_unfiltered (f, "constant ref: 0x%lx (adjusted)",
22983 (long) (DW_UNSND (&die->attrs[i])));
22985 case DW_FORM_data1:
22986 case DW_FORM_data2:
22987 case DW_FORM_data4:
22988 case DW_FORM_data8:
22989 case DW_FORM_udata:
22990 case DW_FORM_sdata:
22991 fprintf_unfiltered (f, "constant: %s",
22992 pulongest (DW_UNSND (&die->attrs[i])));
22994 case DW_FORM_sec_offset:
22995 fprintf_unfiltered (f, "section offset: %s",
22996 pulongest (DW_UNSND (&die->attrs[i])));
22998 case DW_FORM_ref_sig8:
22999 fprintf_unfiltered (f, "signature: %s",
23000 hex_string (DW_SIGNATURE (&die->attrs[i])));
23002 case DW_FORM_string:
23004 case DW_FORM_line_strp:
23006 case DW_FORM_GNU_str_index:
23007 case DW_FORM_GNU_strp_alt:
23008 fprintf_unfiltered (f, "string: \"%s\" (%s canonicalized)",
23009 DW_STRING (&die->attrs[i])
23010 ? DW_STRING (&die->attrs[i]) : "",
23011 DW_STRING_IS_CANONICAL (&die->attrs[i]) ? "is" : "not");
23014 if (DW_UNSND (&die->attrs[i]))
23015 fprintf_unfiltered (f, "flag: TRUE");
23017 fprintf_unfiltered (f, "flag: FALSE");
23019 case DW_FORM_flag_present:
23020 fprintf_unfiltered (f, "flag: TRUE");
23022 case DW_FORM_indirect:
23023 /* The reader will have reduced the indirect form to
23024 the "base form" so this form should not occur. */
23025 fprintf_unfiltered (f,
23026 "unexpected attribute form: DW_FORM_indirect");
23028 case DW_FORM_implicit_const:
23029 fprintf_unfiltered (f, "constant: %s",
23030 plongest (DW_SND (&die->attrs[i])));
23033 fprintf_unfiltered (f, "unsupported attribute form: %d.",
23034 die->attrs[i].form);
23037 fprintf_unfiltered (f, "\n");
23042 dump_die_for_error (struct die_info *die)
23044 dump_die_shallow (gdb_stderr, 0, die);
23048 dump_die_1 (struct ui_file *f, int level, int max_level, struct die_info *die)
23050 int indent = level * 4;
23052 gdb_assert (die != NULL);
23054 if (level >= max_level)
23057 dump_die_shallow (f, indent, die);
23059 if (die->child != NULL)
23061 print_spaces (indent, f);
23062 fprintf_unfiltered (f, " Children:");
23063 if (level + 1 < max_level)
23065 fprintf_unfiltered (f, "\n");
23066 dump_die_1 (f, level + 1, max_level, die->child);
23070 fprintf_unfiltered (f,
23071 " [not printed, max nesting level reached]\n");
23075 if (die->sibling != NULL && level > 0)
23077 dump_die_1 (f, level, max_level, die->sibling);
23081 /* This is called from the pdie macro in gdbinit.in.
23082 It's not static so gcc will keep a copy callable from gdb. */
23085 dump_die (struct die_info *die, int max_level)
23087 dump_die_1 (gdb_stdlog, 0, max_level, die);
23091 store_in_ref_table (struct die_info *die, struct dwarf2_cu *cu)
23095 slot = htab_find_slot_with_hash (cu->die_hash, die,
23096 to_underlying (die->sect_off),
23102 /* Return DIE offset of ATTR. Return 0 with complaint if ATTR is not of the
23106 dwarf2_get_ref_die_offset (const struct attribute *attr)
23108 if (attr_form_is_ref (attr))
23109 return (sect_offset) DW_UNSND (attr);
23111 complaint (_("unsupported die ref attribute form: '%s'"),
23112 dwarf_form_name (attr->form));
23116 /* Return the constant value held by ATTR. Return DEFAULT_VALUE if
23117 * the value held by the attribute is not constant. */
23120 dwarf2_get_attr_constant_value (const struct attribute *attr, int default_value)
23122 if (attr->form == DW_FORM_sdata || attr->form == DW_FORM_implicit_const)
23123 return DW_SND (attr);
23124 else if (attr->form == DW_FORM_udata
23125 || attr->form == DW_FORM_data1
23126 || attr->form == DW_FORM_data2
23127 || attr->form == DW_FORM_data4
23128 || attr->form == DW_FORM_data8)
23129 return DW_UNSND (attr);
23132 /* For DW_FORM_data16 see attr_form_is_constant. */
23133 complaint (_("Attribute value is not a constant (%s)"),
23134 dwarf_form_name (attr->form));
23135 return default_value;
23139 /* Follow reference or signature attribute ATTR of SRC_DIE.
23140 On entry *REF_CU is the CU of SRC_DIE.
23141 On exit *REF_CU is the CU of the result. */
23143 static struct die_info *
23144 follow_die_ref_or_sig (struct die_info *src_die, const struct attribute *attr,
23145 struct dwarf2_cu **ref_cu)
23147 struct die_info *die;
23149 if (attr_form_is_ref (attr))
23150 die = follow_die_ref (src_die, attr, ref_cu);
23151 else if (attr->form == DW_FORM_ref_sig8)
23152 die = follow_die_sig (src_die, attr, ref_cu);
23155 dump_die_for_error (src_die);
23156 error (_("Dwarf Error: Expected reference attribute [in module %s]"),
23157 objfile_name ((*ref_cu)->per_cu->dwarf2_per_objfile->objfile));
23163 /* Follow reference OFFSET.
23164 On entry *REF_CU is the CU of the source die referencing OFFSET.
23165 On exit *REF_CU is the CU of the result.
23166 Returns NULL if OFFSET is invalid. */
23168 static struct die_info *
23169 follow_die_offset (sect_offset sect_off, int offset_in_dwz,
23170 struct dwarf2_cu **ref_cu)
23172 struct die_info temp_die;
23173 struct dwarf2_cu *target_cu, *cu = *ref_cu;
23174 struct dwarf2_per_objfile *dwarf2_per_objfile
23175 = cu->per_cu->dwarf2_per_objfile;
23177 gdb_assert (cu->per_cu != NULL);
23181 if (cu->per_cu->is_debug_types)
23183 /* .debug_types CUs cannot reference anything outside their CU.
23184 If they need to, they have to reference a signatured type via
23185 DW_FORM_ref_sig8. */
23186 if (!offset_in_cu_p (&cu->header, sect_off))
23189 else if (offset_in_dwz != cu->per_cu->is_dwz
23190 || !offset_in_cu_p (&cu->header, sect_off))
23192 struct dwarf2_per_cu_data *per_cu;
23194 per_cu = dwarf2_find_containing_comp_unit (sect_off, offset_in_dwz,
23195 dwarf2_per_objfile);
23197 /* If necessary, add it to the queue and load its DIEs. */
23198 if (maybe_queue_comp_unit (cu, per_cu, cu->language))
23199 load_full_comp_unit (per_cu, false, cu->language);
23201 target_cu = per_cu->cu;
23203 else if (cu->dies == NULL)
23205 /* We're loading full DIEs during partial symbol reading. */
23206 gdb_assert (dwarf2_per_objfile->reading_partial_symbols);
23207 load_full_comp_unit (cu->per_cu, false, language_minimal);
23210 *ref_cu = target_cu;
23211 temp_die.sect_off = sect_off;
23213 if (target_cu != cu)
23214 target_cu->ancestor = cu;
23216 return (struct die_info *) htab_find_with_hash (target_cu->die_hash,
23218 to_underlying (sect_off));
23221 /* Follow reference attribute ATTR of SRC_DIE.
23222 On entry *REF_CU is the CU of SRC_DIE.
23223 On exit *REF_CU is the CU of the result. */
23225 static struct die_info *
23226 follow_die_ref (struct die_info *src_die, const struct attribute *attr,
23227 struct dwarf2_cu **ref_cu)
23229 sect_offset sect_off = dwarf2_get_ref_die_offset (attr);
23230 struct dwarf2_cu *cu = *ref_cu;
23231 struct die_info *die;
23233 die = follow_die_offset (sect_off,
23234 (attr->form == DW_FORM_GNU_ref_alt
23235 || cu->per_cu->is_dwz),
23238 error (_("Dwarf Error: Cannot find DIE at %s referenced from DIE "
23239 "at %s [in module %s]"),
23240 sect_offset_str (sect_off), sect_offset_str (src_die->sect_off),
23241 objfile_name (cu->per_cu->dwarf2_per_objfile->objfile));
23246 /* Return DWARF block referenced by DW_AT_location of DIE at SECT_OFF at PER_CU.
23247 Returned value is intended for DW_OP_call*. Returned
23248 dwarf2_locexpr_baton->data has lifetime of
23249 PER_CU->DWARF2_PER_OBJFILE->OBJFILE. */
23251 struct dwarf2_locexpr_baton
23252 dwarf2_fetch_die_loc_sect_off (sect_offset sect_off,
23253 struct dwarf2_per_cu_data *per_cu,
23254 CORE_ADDR (*get_frame_pc) (void *baton),
23255 void *baton, bool resolve_abstract_p)
23257 struct dwarf2_cu *cu;
23258 struct die_info *die;
23259 struct attribute *attr;
23260 struct dwarf2_locexpr_baton retval;
23261 struct dwarf2_per_objfile *dwarf2_per_objfile = per_cu->dwarf2_per_objfile;
23262 struct objfile *objfile = dwarf2_per_objfile->objfile;
23264 if (per_cu->cu == NULL)
23265 load_cu (per_cu, false);
23269 /* We shouldn't get here for a dummy CU, but don't crash on the user.
23270 Instead just throw an error, not much else we can do. */
23271 error (_("Dwarf Error: Dummy CU at %s referenced in module %s"),
23272 sect_offset_str (sect_off), objfile_name (objfile));
23275 die = follow_die_offset (sect_off, per_cu->is_dwz, &cu);
23277 error (_("Dwarf Error: Cannot find DIE at %s referenced in module %s"),
23278 sect_offset_str (sect_off), objfile_name (objfile));
23280 attr = dwarf2_attr (die, DW_AT_location, cu);
23281 if (!attr && resolve_abstract_p
23282 && (dwarf2_per_objfile->abstract_to_concrete.find (die)
23283 != dwarf2_per_objfile->abstract_to_concrete.end ()))
23285 CORE_ADDR pc = (*get_frame_pc) (baton);
23287 for (const auto &cand : dwarf2_per_objfile->abstract_to_concrete[die])
23290 || cand->parent->tag != DW_TAG_subprogram)
23293 CORE_ADDR pc_low, pc_high;
23294 get_scope_pc_bounds (cand->parent, &pc_low, &pc_high, cu);
23295 if (pc_low == ((CORE_ADDR) -1)
23296 || !(pc_low <= pc && pc < pc_high))
23300 attr = dwarf2_attr (die, DW_AT_location, cu);
23307 /* DWARF: "If there is no such attribute, then there is no effect.".
23308 DATA is ignored if SIZE is 0. */
23310 retval.data = NULL;
23313 else if (attr_form_is_section_offset (attr))
23315 struct dwarf2_loclist_baton loclist_baton;
23316 CORE_ADDR pc = (*get_frame_pc) (baton);
23319 fill_in_loclist_baton (cu, &loclist_baton, attr);
23321 retval.data = dwarf2_find_location_expression (&loclist_baton,
23323 retval.size = size;
23327 if (!attr_form_is_block (attr))
23328 error (_("Dwarf Error: DIE at %s referenced in module %s "
23329 "is neither DW_FORM_block* nor DW_FORM_exprloc"),
23330 sect_offset_str (sect_off), objfile_name (objfile));
23332 retval.data = DW_BLOCK (attr)->data;
23333 retval.size = DW_BLOCK (attr)->size;
23335 retval.per_cu = cu->per_cu;
23337 age_cached_comp_units (dwarf2_per_objfile);
23342 /* Like dwarf2_fetch_die_loc_sect_off, but take a CU
23345 struct dwarf2_locexpr_baton
23346 dwarf2_fetch_die_loc_cu_off (cu_offset offset_in_cu,
23347 struct dwarf2_per_cu_data *per_cu,
23348 CORE_ADDR (*get_frame_pc) (void *baton),
23351 sect_offset sect_off = per_cu->sect_off + to_underlying (offset_in_cu);
23353 return dwarf2_fetch_die_loc_sect_off (sect_off, per_cu, get_frame_pc, baton);
23356 /* Write a constant of a given type as target-ordered bytes into
23359 static const gdb_byte *
23360 write_constant_as_bytes (struct obstack *obstack,
23361 enum bfd_endian byte_order,
23368 *len = TYPE_LENGTH (type);
23369 result = (gdb_byte *) obstack_alloc (obstack, *len);
23370 store_unsigned_integer (result, *len, byte_order, value);
23375 /* If the DIE at OFFSET in PER_CU has a DW_AT_const_value, return a
23376 pointer to the constant bytes and set LEN to the length of the
23377 data. If memory is needed, allocate it on OBSTACK. If the DIE
23378 does not have a DW_AT_const_value, return NULL. */
23381 dwarf2_fetch_constant_bytes (sect_offset sect_off,
23382 struct dwarf2_per_cu_data *per_cu,
23383 struct obstack *obstack,
23386 struct dwarf2_cu *cu;
23387 struct die_info *die;
23388 struct attribute *attr;
23389 const gdb_byte *result = NULL;
23392 enum bfd_endian byte_order;
23393 struct objfile *objfile = per_cu->dwarf2_per_objfile->objfile;
23395 if (per_cu->cu == NULL)
23396 load_cu (per_cu, false);
23400 /* We shouldn't get here for a dummy CU, but don't crash on the user.
23401 Instead just throw an error, not much else we can do. */
23402 error (_("Dwarf Error: Dummy CU at %s referenced in module %s"),
23403 sect_offset_str (sect_off), objfile_name (objfile));
23406 die = follow_die_offset (sect_off, per_cu->is_dwz, &cu);
23408 error (_("Dwarf Error: Cannot find DIE at %s referenced in module %s"),
23409 sect_offset_str (sect_off), objfile_name (objfile));
23411 attr = dwarf2_attr (die, DW_AT_const_value, cu);
23415 byte_order = (bfd_big_endian (objfile->obfd)
23416 ? BFD_ENDIAN_BIG : BFD_ENDIAN_LITTLE);
23418 switch (attr->form)
23421 case DW_FORM_addrx:
23422 case DW_FORM_GNU_addr_index:
23426 *len = cu->header.addr_size;
23427 tem = (gdb_byte *) obstack_alloc (obstack, *len);
23428 store_unsigned_integer (tem, *len, byte_order, DW_ADDR (attr));
23432 case DW_FORM_string:
23435 case DW_FORM_GNU_str_index:
23436 case DW_FORM_GNU_strp_alt:
23437 /* DW_STRING is already allocated on the objfile obstack, point
23439 result = (const gdb_byte *) DW_STRING (attr);
23440 *len = strlen (DW_STRING (attr));
23442 case DW_FORM_block1:
23443 case DW_FORM_block2:
23444 case DW_FORM_block4:
23445 case DW_FORM_block:
23446 case DW_FORM_exprloc:
23447 case DW_FORM_data16:
23448 result = DW_BLOCK (attr)->data;
23449 *len = DW_BLOCK (attr)->size;
23452 /* The DW_AT_const_value attributes are supposed to carry the
23453 symbol's value "represented as it would be on the target
23454 architecture." By the time we get here, it's already been
23455 converted to host endianness, so we just need to sign- or
23456 zero-extend it as appropriate. */
23457 case DW_FORM_data1:
23458 type = die_type (die, cu);
23459 result = dwarf2_const_value_data (attr, obstack, cu, &value, 8);
23460 if (result == NULL)
23461 result = write_constant_as_bytes (obstack, byte_order,
23464 case DW_FORM_data2:
23465 type = die_type (die, cu);
23466 result = dwarf2_const_value_data (attr, obstack, cu, &value, 16);
23467 if (result == NULL)
23468 result = write_constant_as_bytes (obstack, byte_order,
23471 case DW_FORM_data4:
23472 type = die_type (die, cu);
23473 result = dwarf2_const_value_data (attr, obstack, cu, &value, 32);
23474 if (result == NULL)
23475 result = write_constant_as_bytes (obstack, byte_order,
23478 case DW_FORM_data8:
23479 type = die_type (die, cu);
23480 result = dwarf2_const_value_data (attr, obstack, cu, &value, 64);
23481 if (result == NULL)
23482 result = write_constant_as_bytes (obstack, byte_order,
23486 case DW_FORM_sdata:
23487 case DW_FORM_implicit_const:
23488 type = die_type (die, cu);
23489 result = write_constant_as_bytes (obstack, byte_order,
23490 type, DW_SND (attr), len);
23493 case DW_FORM_udata:
23494 type = die_type (die, cu);
23495 result = write_constant_as_bytes (obstack, byte_order,
23496 type, DW_UNSND (attr), len);
23500 complaint (_("unsupported const value attribute form: '%s'"),
23501 dwarf_form_name (attr->form));
23508 /* Return the type of the die at OFFSET in PER_CU. Return NULL if no
23509 valid type for this die is found. */
23512 dwarf2_fetch_die_type_sect_off (sect_offset sect_off,
23513 struct dwarf2_per_cu_data *per_cu)
23515 struct dwarf2_cu *cu;
23516 struct die_info *die;
23518 if (per_cu->cu == NULL)
23519 load_cu (per_cu, false);
23524 die = follow_die_offset (sect_off, per_cu->is_dwz, &cu);
23528 return die_type (die, cu);
23531 /* Return the type of the DIE at DIE_OFFSET in the CU named by
23535 dwarf2_get_die_type (cu_offset die_offset,
23536 struct dwarf2_per_cu_data *per_cu)
23538 sect_offset die_offset_sect = per_cu->sect_off + to_underlying (die_offset);
23539 return get_die_type_at_offset (die_offset_sect, per_cu);
23542 /* Follow type unit SIG_TYPE referenced by SRC_DIE.
23543 On entry *REF_CU is the CU of SRC_DIE.
23544 On exit *REF_CU is the CU of the result.
23545 Returns NULL if the referenced DIE isn't found. */
23547 static struct die_info *
23548 follow_die_sig_1 (struct die_info *src_die, struct signatured_type *sig_type,
23549 struct dwarf2_cu **ref_cu)
23551 struct die_info temp_die;
23552 struct dwarf2_cu *sig_cu, *cu = *ref_cu;
23553 struct die_info *die;
23555 /* While it might be nice to assert sig_type->type == NULL here,
23556 we can get here for DW_AT_imported_declaration where we need
23557 the DIE not the type. */
23559 /* If necessary, add it to the queue and load its DIEs. */
23561 if (maybe_queue_comp_unit (*ref_cu, &sig_type->per_cu, language_minimal))
23562 read_signatured_type (sig_type);
23564 sig_cu = sig_type->per_cu.cu;
23565 gdb_assert (sig_cu != NULL);
23566 gdb_assert (to_underlying (sig_type->type_offset_in_section) != 0);
23567 temp_die.sect_off = sig_type->type_offset_in_section;
23568 die = (struct die_info *) htab_find_with_hash (sig_cu->die_hash, &temp_die,
23569 to_underlying (temp_die.sect_off));
23572 struct dwarf2_per_objfile *dwarf2_per_objfile
23573 = (*ref_cu)->per_cu->dwarf2_per_objfile;
23575 /* For .gdb_index version 7 keep track of included TUs.
23576 http://sourceware.org/bugzilla/show_bug.cgi?id=15021. */
23577 if (dwarf2_per_objfile->index_table != NULL
23578 && dwarf2_per_objfile->index_table->version <= 7)
23580 VEC_safe_push (dwarf2_per_cu_ptr,
23581 (*ref_cu)->per_cu->imported_symtabs,
23587 sig_cu->ancestor = cu;
23595 /* Follow signatured type referenced by ATTR in SRC_DIE.
23596 On entry *REF_CU is the CU of SRC_DIE.
23597 On exit *REF_CU is the CU of the result.
23598 The result is the DIE of the type.
23599 If the referenced type cannot be found an error is thrown. */
23601 static struct die_info *
23602 follow_die_sig (struct die_info *src_die, const struct attribute *attr,
23603 struct dwarf2_cu **ref_cu)
23605 ULONGEST signature = DW_SIGNATURE (attr);
23606 struct signatured_type *sig_type;
23607 struct die_info *die;
23609 gdb_assert (attr->form == DW_FORM_ref_sig8);
23611 sig_type = lookup_signatured_type (*ref_cu, signature);
23612 /* sig_type will be NULL if the signatured type is missing from
23614 if (sig_type == NULL)
23616 error (_("Dwarf Error: Cannot find signatured DIE %s referenced"
23617 " from DIE at %s [in module %s]"),
23618 hex_string (signature), sect_offset_str (src_die->sect_off),
23619 objfile_name ((*ref_cu)->per_cu->dwarf2_per_objfile->objfile));
23622 die = follow_die_sig_1 (src_die, sig_type, ref_cu);
23625 dump_die_for_error (src_die);
23626 error (_("Dwarf Error: Problem reading signatured DIE %s referenced"
23627 " from DIE at %s [in module %s]"),
23628 hex_string (signature), sect_offset_str (src_die->sect_off),
23629 objfile_name ((*ref_cu)->per_cu->dwarf2_per_objfile->objfile));
23635 /* Get the type specified by SIGNATURE referenced in DIE/CU,
23636 reading in and processing the type unit if necessary. */
23638 static struct type *
23639 get_signatured_type (struct die_info *die, ULONGEST signature,
23640 struct dwarf2_cu *cu)
23642 struct dwarf2_per_objfile *dwarf2_per_objfile
23643 = cu->per_cu->dwarf2_per_objfile;
23644 struct signatured_type *sig_type;
23645 struct dwarf2_cu *type_cu;
23646 struct die_info *type_die;
23649 sig_type = lookup_signatured_type (cu, signature);
23650 /* sig_type will be NULL if the signatured type is missing from
23652 if (sig_type == NULL)
23654 complaint (_("Dwarf Error: Cannot find signatured DIE %s referenced"
23655 " from DIE at %s [in module %s]"),
23656 hex_string (signature), sect_offset_str (die->sect_off),
23657 objfile_name (dwarf2_per_objfile->objfile));
23658 return build_error_marker_type (cu, die);
23661 /* If we already know the type we're done. */
23662 if (sig_type->type != NULL)
23663 return sig_type->type;
23666 type_die = follow_die_sig_1 (die, sig_type, &type_cu);
23667 if (type_die != NULL)
23669 /* N.B. We need to call get_die_type to ensure only one type for this DIE
23670 is created. This is important, for example, because for c++ classes
23671 we need TYPE_NAME set which is only done by new_symbol. Blech. */
23672 type = read_type_die (type_die, type_cu);
23675 complaint (_("Dwarf Error: Cannot build signatured type %s"
23676 " referenced from DIE at %s [in module %s]"),
23677 hex_string (signature), sect_offset_str (die->sect_off),
23678 objfile_name (dwarf2_per_objfile->objfile));
23679 type = build_error_marker_type (cu, die);
23684 complaint (_("Dwarf Error: Problem reading signatured DIE %s referenced"
23685 " from DIE at %s [in module %s]"),
23686 hex_string (signature), sect_offset_str (die->sect_off),
23687 objfile_name (dwarf2_per_objfile->objfile));
23688 type = build_error_marker_type (cu, die);
23690 sig_type->type = type;
23695 /* Get the type specified by the DW_AT_signature ATTR in DIE/CU,
23696 reading in and processing the type unit if necessary. */
23698 static struct type *
23699 get_DW_AT_signature_type (struct die_info *die, const struct attribute *attr,
23700 struct dwarf2_cu *cu) /* ARI: editCase function */
23702 /* Yes, DW_AT_signature can use a non-ref_sig8 reference. */
23703 if (attr_form_is_ref (attr))
23705 struct dwarf2_cu *type_cu = cu;
23706 struct die_info *type_die = follow_die_ref (die, attr, &type_cu);
23708 return read_type_die (type_die, type_cu);
23710 else if (attr->form == DW_FORM_ref_sig8)
23712 return get_signatured_type (die, DW_SIGNATURE (attr), cu);
23716 struct dwarf2_per_objfile *dwarf2_per_objfile
23717 = cu->per_cu->dwarf2_per_objfile;
23719 complaint (_("Dwarf Error: DW_AT_signature has bad form %s in DIE"
23720 " at %s [in module %s]"),
23721 dwarf_form_name (attr->form), sect_offset_str (die->sect_off),
23722 objfile_name (dwarf2_per_objfile->objfile));
23723 return build_error_marker_type (cu, die);
23727 /* Load the DIEs associated with type unit PER_CU into memory. */
23730 load_full_type_unit (struct dwarf2_per_cu_data *per_cu)
23732 struct signatured_type *sig_type;
23734 /* Caller is responsible for ensuring type_unit_groups don't get here. */
23735 gdb_assert (! IS_TYPE_UNIT_GROUP (per_cu));
23737 /* We have the per_cu, but we need the signatured_type.
23738 Fortunately this is an easy translation. */
23739 gdb_assert (per_cu->is_debug_types);
23740 sig_type = (struct signatured_type *) per_cu;
23742 gdb_assert (per_cu->cu == NULL);
23744 read_signatured_type (sig_type);
23746 gdb_assert (per_cu->cu != NULL);
23749 /* die_reader_func for read_signatured_type.
23750 This is identical to load_full_comp_unit_reader,
23751 but is kept separate for now. */
23754 read_signatured_type_reader (const struct die_reader_specs *reader,
23755 const gdb_byte *info_ptr,
23756 struct die_info *comp_unit_die,
23760 struct dwarf2_cu *cu = reader->cu;
23762 gdb_assert (cu->die_hash == NULL);
23764 htab_create_alloc_ex (cu->header.length / 12,
23768 &cu->comp_unit_obstack,
23769 hashtab_obstack_allocate,
23770 dummy_obstack_deallocate);
23773 comp_unit_die->child = read_die_and_siblings (reader, info_ptr,
23774 &info_ptr, comp_unit_die);
23775 cu->dies = comp_unit_die;
23776 /* comp_unit_die is not stored in die_hash, no need. */
23778 /* We try not to read any attributes in this function, because not
23779 all CUs needed for references have been loaded yet, and symbol
23780 table processing isn't initialized. But we have to set the CU language,
23781 or we won't be able to build types correctly.
23782 Similarly, if we do not read the producer, we can not apply
23783 producer-specific interpretation. */
23784 prepare_one_comp_unit (cu, cu->dies, language_minimal);
23787 /* Read in a signatured type and build its CU and DIEs.
23788 If the type is a stub for the real type in a DWO file,
23789 read in the real type from the DWO file as well. */
23792 read_signatured_type (struct signatured_type *sig_type)
23794 struct dwarf2_per_cu_data *per_cu = &sig_type->per_cu;
23796 gdb_assert (per_cu->is_debug_types);
23797 gdb_assert (per_cu->cu == NULL);
23799 init_cutu_and_read_dies (per_cu, NULL, 0, 1, false,
23800 read_signatured_type_reader, NULL);
23801 sig_type->per_cu.tu_read = 1;
23804 /* Decode simple location descriptions.
23805 Given a pointer to a dwarf block that defines a location, compute
23806 the location and return the value.
23808 NOTE drow/2003-11-18: This function is called in two situations
23809 now: for the address of static or global variables (partial symbols
23810 only) and for offsets into structures which are expected to be
23811 (more or less) constant. The partial symbol case should go away,
23812 and only the constant case should remain. That will let this
23813 function complain more accurately. A few special modes are allowed
23814 without complaint for global variables (for instance, global
23815 register values and thread-local values).
23817 A location description containing no operations indicates that the
23818 object is optimized out. The return value is 0 for that case.
23819 FIXME drow/2003-11-16: No callers check for this case any more; soon all
23820 callers will only want a very basic result and this can become a
23823 Note that stack[0] is unused except as a default error return. */
23826 decode_locdesc (struct dwarf_block *blk, struct dwarf2_cu *cu)
23828 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
23830 size_t size = blk->size;
23831 const gdb_byte *data = blk->data;
23832 CORE_ADDR stack[64];
23834 unsigned int bytes_read, unsnd;
23840 stack[++stacki] = 0;
23879 stack[++stacki] = op - DW_OP_lit0;
23914 stack[++stacki] = op - DW_OP_reg0;
23916 dwarf2_complex_location_expr_complaint ();
23920 unsnd = read_unsigned_leb128 (NULL, (data + i), &bytes_read);
23922 stack[++stacki] = unsnd;
23924 dwarf2_complex_location_expr_complaint ();
23928 stack[++stacki] = read_address (objfile->obfd, &data[i],
23933 case DW_OP_const1u:
23934 stack[++stacki] = read_1_byte (objfile->obfd, &data[i]);
23938 case DW_OP_const1s:
23939 stack[++stacki] = read_1_signed_byte (objfile->obfd, &data[i]);
23943 case DW_OP_const2u:
23944 stack[++stacki] = read_2_bytes (objfile->obfd, &data[i]);
23948 case DW_OP_const2s:
23949 stack[++stacki] = read_2_signed_bytes (objfile->obfd, &data[i]);
23953 case DW_OP_const4u:
23954 stack[++stacki] = read_4_bytes (objfile->obfd, &data[i]);
23958 case DW_OP_const4s:
23959 stack[++stacki] = read_4_signed_bytes (objfile->obfd, &data[i]);
23963 case DW_OP_const8u:
23964 stack[++stacki] = read_8_bytes (objfile->obfd, &data[i]);
23969 stack[++stacki] = read_unsigned_leb128 (NULL, (data + i),
23975 stack[++stacki] = read_signed_leb128 (NULL, (data + i), &bytes_read);
23980 stack[stacki + 1] = stack[stacki];
23985 stack[stacki - 1] += stack[stacki];
23989 case DW_OP_plus_uconst:
23990 stack[stacki] += read_unsigned_leb128 (NULL, (data + i),
23996 stack[stacki - 1] -= stack[stacki];
24001 /* If we're not the last op, then we definitely can't encode
24002 this using GDB's address_class enum. This is valid for partial
24003 global symbols, although the variable's address will be bogus
24006 dwarf2_complex_location_expr_complaint ();
24009 case DW_OP_GNU_push_tls_address:
24010 case DW_OP_form_tls_address:
24011 /* The top of the stack has the offset from the beginning
24012 of the thread control block at which the variable is located. */
24013 /* Nothing should follow this operator, so the top of stack would
24015 /* This is valid for partial global symbols, but the variable's
24016 address will be bogus in the psymtab. Make it always at least
24017 non-zero to not look as a variable garbage collected by linker
24018 which have DW_OP_addr 0. */
24020 dwarf2_complex_location_expr_complaint ();
24024 case DW_OP_GNU_uninit:
24028 case DW_OP_GNU_addr_index:
24029 case DW_OP_GNU_const_index:
24030 stack[++stacki] = read_addr_index_from_leb128 (cu, &data[i],
24037 const char *name = get_DW_OP_name (op);
24040 complaint (_("unsupported stack op: '%s'"),
24043 complaint (_("unsupported stack op: '%02x'"),
24047 return (stack[stacki]);
24050 /* Enforce maximum stack depth of SIZE-1 to avoid writing
24051 outside of the allocated space. Also enforce minimum>0. */
24052 if (stacki >= ARRAY_SIZE (stack) - 1)
24054 complaint (_("location description stack overflow"));
24060 complaint (_("location description stack underflow"));
24064 return (stack[stacki]);
24067 /* memory allocation interface */
24069 static struct dwarf_block *
24070 dwarf_alloc_block (struct dwarf2_cu *cu)
24072 return XOBNEW (&cu->comp_unit_obstack, struct dwarf_block);
24075 static struct die_info *
24076 dwarf_alloc_die (struct dwarf2_cu *cu, int num_attrs)
24078 struct die_info *die;
24079 size_t size = sizeof (struct die_info);
24082 size += (num_attrs - 1) * sizeof (struct attribute);
24084 die = (struct die_info *) obstack_alloc (&cu->comp_unit_obstack, size);
24085 memset (die, 0, sizeof (struct die_info));
24090 /* Macro support. */
24092 /* Return file name relative to the compilation directory of file number I in
24093 *LH's file name table. The result is allocated using xmalloc; the caller is
24094 responsible for freeing it. */
24097 file_file_name (int file, struct line_header *lh)
24099 /* Is the file number a valid index into the line header's file name
24100 table? Remember that file numbers start with one, not zero. */
24101 if (1 <= file && file <= lh->file_names.size ())
24103 const file_entry &fe = lh->file_names[file - 1];
24105 if (!IS_ABSOLUTE_PATH (fe.name))
24107 const char *dir = fe.include_dir (lh);
24109 return concat (dir, SLASH_STRING, fe.name, (char *) NULL);
24111 return xstrdup (fe.name);
24115 /* The compiler produced a bogus file number. We can at least
24116 record the macro definitions made in the file, even if we
24117 won't be able to find the file by name. */
24118 char fake_name[80];
24120 xsnprintf (fake_name, sizeof (fake_name),
24121 "<bad macro file number %d>", file);
24123 complaint (_("bad file number in macro information (%d)"),
24126 return xstrdup (fake_name);
24130 /* Return the full name of file number I in *LH's file name table.
24131 Use COMP_DIR as the name of the current directory of the
24132 compilation. The result is allocated using xmalloc; the caller is
24133 responsible for freeing it. */
24135 file_full_name (int file, struct line_header *lh, const char *comp_dir)
24137 /* Is the file number a valid index into the line header's file name
24138 table? Remember that file numbers start with one, not zero. */
24139 if (1 <= file && file <= lh->file_names.size ())
24141 char *relative = file_file_name (file, lh);
24143 if (IS_ABSOLUTE_PATH (relative) || comp_dir == NULL)
24145 return reconcat (relative, comp_dir, SLASH_STRING,
24146 relative, (char *) NULL);
24149 return file_file_name (file, lh);
24153 static struct macro_source_file *
24154 macro_start_file (struct dwarf2_cu *cu,
24155 int file, int line,
24156 struct macro_source_file *current_file,
24157 struct line_header *lh)
24159 /* File name relative to the compilation directory of this source file. */
24160 char *file_name = file_file_name (file, lh);
24162 if (! current_file)
24164 /* Note: We don't create a macro table for this compilation unit
24165 at all until we actually get a filename. */
24166 struct macro_table *macro_table = cu->get_builder ()->get_macro_table ();
24168 /* If we have no current file, then this must be the start_file
24169 directive for the compilation unit's main source file. */
24170 current_file = macro_set_main (macro_table, file_name);
24171 macro_define_special (macro_table);
24174 current_file = macro_include (current_file, line, file_name);
24178 return current_file;
24181 static const char *
24182 consume_improper_spaces (const char *p, const char *body)
24186 complaint (_("macro definition contains spaces "
24187 "in formal argument list:\n`%s'"),
24199 parse_macro_definition (struct macro_source_file *file, int line,
24204 /* The body string takes one of two forms. For object-like macro
24205 definitions, it should be:
24207 <macro name> " " <definition>
24209 For function-like macro definitions, it should be:
24211 <macro name> "() " <definition>
24213 <macro name> "(" <arg name> ( "," <arg name> ) * ") " <definition>
24215 Spaces may appear only where explicitly indicated, and in the
24218 The Dwarf 2 spec says that an object-like macro's name is always
24219 followed by a space, but versions of GCC around March 2002 omit
24220 the space when the macro's definition is the empty string.
24222 The Dwarf 2 spec says that there should be no spaces between the
24223 formal arguments in a function-like macro's formal argument list,
24224 but versions of GCC around March 2002 include spaces after the
24228 /* Find the extent of the macro name. The macro name is terminated
24229 by either a space or null character (for an object-like macro) or
24230 an opening paren (for a function-like macro). */
24231 for (p = body; *p; p++)
24232 if (*p == ' ' || *p == '(')
24235 if (*p == ' ' || *p == '\0')
24237 /* It's an object-like macro. */
24238 int name_len = p - body;
24239 char *name = savestring (body, name_len);
24240 const char *replacement;
24243 replacement = body + name_len + 1;
24246 dwarf2_macro_malformed_definition_complaint (body);
24247 replacement = body + name_len;
24250 macro_define_object (file, line, name, replacement);
24254 else if (*p == '(')
24256 /* It's a function-like macro. */
24257 char *name = savestring (body, p - body);
24260 char **argv = XNEWVEC (char *, argv_size);
24264 p = consume_improper_spaces (p, body);
24266 /* Parse the formal argument list. */
24267 while (*p && *p != ')')
24269 /* Find the extent of the current argument name. */
24270 const char *arg_start = p;
24272 while (*p && *p != ',' && *p != ')' && *p != ' ')
24275 if (! *p || p == arg_start)
24276 dwarf2_macro_malformed_definition_complaint (body);
24279 /* Make sure argv has room for the new argument. */
24280 if (argc >= argv_size)
24283 argv = XRESIZEVEC (char *, argv, argv_size);
24286 argv[argc++] = savestring (arg_start, p - arg_start);
24289 p = consume_improper_spaces (p, body);
24291 /* Consume the comma, if present. */
24296 p = consume_improper_spaces (p, body);
24305 /* Perfectly formed definition, no complaints. */
24306 macro_define_function (file, line, name,
24307 argc, (const char **) argv,
24309 else if (*p == '\0')
24311 /* Complain, but do define it. */
24312 dwarf2_macro_malformed_definition_complaint (body);
24313 macro_define_function (file, line, name,
24314 argc, (const char **) argv,
24318 /* Just complain. */
24319 dwarf2_macro_malformed_definition_complaint (body);
24322 /* Just complain. */
24323 dwarf2_macro_malformed_definition_complaint (body);
24329 for (i = 0; i < argc; i++)
24335 dwarf2_macro_malformed_definition_complaint (body);
24338 /* Skip some bytes from BYTES according to the form given in FORM.
24339 Returns the new pointer. */
24341 static const gdb_byte *
24342 skip_form_bytes (bfd *abfd, const gdb_byte *bytes, const gdb_byte *buffer_end,
24343 enum dwarf_form form,
24344 unsigned int offset_size,
24345 struct dwarf2_section_info *section)
24347 unsigned int bytes_read;
24351 case DW_FORM_data1:
24356 case DW_FORM_data2:
24360 case DW_FORM_data4:
24364 case DW_FORM_data8:
24368 case DW_FORM_data16:
24372 case DW_FORM_string:
24373 read_direct_string (abfd, bytes, &bytes_read);
24374 bytes += bytes_read;
24377 case DW_FORM_sec_offset:
24379 case DW_FORM_GNU_strp_alt:
24380 bytes += offset_size;
24383 case DW_FORM_block:
24384 bytes += read_unsigned_leb128 (abfd, bytes, &bytes_read);
24385 bytes += bytes_read;
24388 case DW_FORM_block1:
24389 bytes += 1 + read_1_byte (abfd, bytes);
24391 case DW_FORM_block2:
24392 bytes += 2 + read_2_bytes (abfd, bytes);
24394 case DW_FORM_block4:
24395 bytes += 4 + read_4_bytes (abfd, bytes);
24398 case DW_FORM_addrx:
24399 case DW_FORM_sdata:
24401 case DW_FORM_udata:
24402 case DW_FORM_GNU_addr_index:
24403 case DW_FORM_GNU_str_index:
24404 bytes = gdb_skip_leb128 (bytes, buffer_end);
24407 dwarf2_section_buffer_overflow_complaint (section);
24412 case DW_FORM_implicit_const:
24417 complaint (_("invalid form 0x%x in `%s'"),
24418 form, get_section_name (section));
24426 /* A helper for dwarf_decode_macros that handles skipping an unknown
24427 opcode. Returns an updated pointer to the macro data buffer; or,
24428 on error, issues a complaint and returns NULL. */
24430 static const gdb_byte *
24431 skip_unknown_opcode (unsigned int opcode,
24432 const gdb_byte **opcode_definitions,
24433 const gdb_byte *mac_ptr, const gdb_byte *mac_end,
24435 unsigned int offset_size,
24436 struct dwarf2_section_info *section)
24438 unsigned int bytes_read, i;
24440 const gdb_byte *defn;
24442 if (opcode_definitions[opcode] == NULL)
24444 complaint (_("unrecognized DW_MACFINO opcode 0x%x"),
24449 defn = opcode_definitions[opcode];
24450 arg = read_unsigned_leb128 (abfd, defn, &bytes_read);
24451 defn += bytes_read;
24453 for (i = 0; i < arg; ++i)
24455 mac_ptr = skip_form_bytes (abfd, mac_ptr, mac_end,
24456 (enum dwarf_form) defn[i], offset_size,
24458 if (mac_ptr == NULL)
24460 /* skip_form_bytes already issued the complaint. */
24468 /* A helper function which parses the header of a macro section.
24469 If the macro section is the extended (for now called "GNU") type,
24470 then this updates *OFFSET_SIZE. Returns a pointer to just after
24471 the header, or issues a complaint and returns NULL on error. */
24473 static const gdb_byte *
24474 dwarf_parse_macro_header (const gdb_byte **opcode_definitions,
24476 const gdb_byte *mac_ptr,
24477 unsigned int *offset_size,
24478 int section_is_gnu)
24480 memset (opcode_definitions, 0, 256 * sizeof (gdb_byte *));
24482 if (section_is_gnu)
24484 unsigned int version, flags;
24486 version = read_2_bytes (abfd, mac_ptr);
24487 if (version != 4 && version != 5)
24489 complaint (_("unrecognized version `%d' in .debug_macro section"),
24495 flags = read_1_byte (abfd, mac_ptr);
24497 *offset_size = (flags & 1) ? 8 : 4;
24499 if ((flags & 2) != 0)
24500 /* We don't need the line table offset. */
24501 mac_ptr += *offset_size;
24503 /* Vendor opcode descriptions. */
24504 if ((flags & 4) != 0)
24506 unsigned int i, count;
24508 count = read_1_byte (abfd, mac_ptr);
24510 for (i = 0; i < count; ++i)
24512 unsigned int opcode, bytes_read;
24515 opcode = read_1_byte (abfd, mac_ptr);
24517 opcode_definitions[opcode] = mac_ptr;
24518 arg = read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
24519 mac_ptr += bytes_read;
24528 /* A helper for dwarf_decode_macros that handles the GNU extensions,
24529 including DW_MACRO_import. */
24532 dwarf_decode_macro_bytes (struct dwarf2_cu *cu,
24534 const gdb_byte *mac_ptr, const gdb_byte *mac_end,
24535 struct macro_source_file *current_file,
24536 struct line_header *lh,
24537 struct dwarf2_section_info *section,
24538 int section_is_gnu, int section_is_dwz,
24539 unsigned int offset_size,
24540 htab_t include_hash)
24542 struct dwarf2_per_objfile *dwarf2_per_objfile
24543 = cu->per_cu->dwarf2_per_objfile;
24544 struct objfile *objfile = dwarf2_per_objfile->objfile;
24545 enum dwarf_macro_record_type macinfo_type;
24546 int at_commandline;
24547 const gdb_byte *opcode_definitions[256];
24549 mac_ptr = dwarf_parse_macro_header (opcode_definitions, abfd, mac_ptr,
24550 &offset_size, section_is_gnu);
24551 if (mac_ptr == NULL)
24553 /* We already issued a complaint. */
24557 /* Determines if GDB is still before first DW_MACINFO_start_file. If true
24558 GDB is still reading the definitions from command line. First
24559 DW_MACINFO_start_file will need to be ignored as it was already executed
24560 to create CURRENT_FILE for the main source holding also the command line
24561 definitions. On first met DW_MACINFO_start_file this flag is reset to
24562 normally execute all the remaining DW_MACINFO_start_file macinfos. */
24564 at_commandline = 1;
24568 /* Do we at least have room for a macinfo type byte? */
24569 if (mac_ptr >= mac_end)
24571 dwarf2_section_buffer_overflow_complaint (section);
24575 macinfo_type = (enum dwarf_macro_record_type) read_1_byte (abfd, mac_ptr);
24578 /* Note that we rely on the fact that the corresponding GNU and
24579 DWARF constants are the same. */
24581 DIAGNOSTIC_IGNORE_SWITCH_DIFFERENT_ENUM_TYPES
24582 switch (macinfo_type)
24584 /* A zero macinfo type indicates the end of the macro
24589 case DW_MACRO_define:
24590 case DW_MACRO_undef:
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;
24601 line = read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
24602 mac_ptr += bytes_read;
24604 if (macinfo_type == DW_MACRO_define
24605 || macinfo_type == DW_MACRO_undef)
24607 body = read_direct_string (abfd, mac_ptr, &bytes_read);
24608 mac_ptr += bytes_read;
24612 LONGEST str_offset;
24614 str_offset = read_offset_1 (abfd, mac_ptr, offset_size);
24615 mac_ptr += offset_size;
24617 if (macinfo_type == DW_MACRO_define_sup
24618 || macinfo_type == DW_MACRO_undef_sup
24621 struct dwz_file *dwz
24622 = dwarf2_get_dwz_file (dwarf2_per_objfile);
24624 body = read_indirect_string_from_dwz (objfile,
24628 body = read_indirect_string_at_offset (dwarf2_per_objfile,
24632 is_define = (macinfo_type == DW_MACRO_define
24633 || macinfo_type == DW_MACRO_define_strp
24634 || macinfo_type == DW_MACRO_define_sup);
24635 if (! current_file)
24637 /* DWARF violation as no main source is present. */
24638 complaint (_("debug info with no main source gives macro %s "
24640 is_define ? _("definition") : _("undefinition"),
24644 if ((line == 0 && !at_commandline)
24645 || (line != 0 && at_commandline))
24646 complaint (_("debug info gives %s macro %s with %s line %d: %s"),
24647 at_commandline ? _("command-line") : _("in-file"),
24648 is_define ? _("definition") : _("undefinition"),
24649 line == 0 ? _("zero") : _("non-zero"), line, body);
24653 /* Fedora's rpm-build's "debugedit" binary
24654 corrupted .debug_macro sections.
24657 https://bugzilla.redhat.com/show_bug.cgi?id=1708786 */
24658 complaint (_("debug info gives %s invalid macro %s "
24659 "without body (corrupted?) at line %d "
24661 at_commandline ? _("command-line") : _("in-file"),
24662 is_define ? _("definition") : _("undefinition"),
24663 line, current_file->filename);
24665 else if (is_define)
24666 parse_macro_definition (current_file, line, body);
24669 gdb_assert (macinfo_type == DW_MACRO_undef
24670 || macinfo_type == DW_MACRO_undef_strp
24671 || macinfo_type == DW_MACRO_undef_sup);
24672 macro_undef (current_file, line, body);
24677 case DW_MACRO_start_file:
24679 unsigned int bytes_read;
24682 line = read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
24683 mac_ptr += bytes_read;
24684 file = read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
24685 mac_ptr += bytes_read;
24687 if ((line == 0 && !at_commandline)
24688 || (line != 0 && at_commandline))
24689 complaint (_("debug info gives source %d included "
24690 "from %s at %s line %d"),
24691 file, at_commandline ? _("command-line") : _("file"),
24692 line == 0 ? _("zero") : _("non-zero"), line);
24694 if (at_commandline)
24696 /* This DW_MACRO_start_file was executed in the
24698 at_commandline = 0;
24701 current_file = macro_start_file (cu, file, line, current_file,
24706 case DW_MACRO_end_file:
24707 if (! current_file)
24708 complaint (_("macro debug info has an unmatched "
24709 "`close_file' directive"));
24712 current_file = current_file->included_by;
24713 if (! current_file)
24715 enum dwarf_macro_record_type next_type;
24717 /* GCC circa March 2002 doesn't produce the zero
24718 type byte marking the end of the compilation
24719 unit. Complain if it's not there, but exit no
24722 /* Do we at least have room for a macinfo type byte? */
24723 if (mac_ptr >= mac_end)
24725 dwarf2_section_buffer_overflow_complaint (section);
24729 /* We don't increment mac_ptr here, so this is just
24732 = (enum dwarf_macro_record_type) read_1_byte (abfd,
24734 if (next_type != 0)
24735 complaint (_("no terminating 0-type entry for "
24736 "macros in `.debug_macinfo' section"));
24743 case DW_MACRO_import:
24744 case DW_MACRO_import_sup:
24748 bfd *include_bfd = abfd;
24749 struct dwarf2_section_info *include_section = section;
24750 const gdb_byte *include_mac_end = mac_end;
24751 int is_dwz = section_is_dwz;
24752 const gdb_byte *new_mac_ptr;
24754 offset = read_offset_1 (abfd, mac_ptr, offset_size);
24755 mac_ptr += offset_size;
24757 if (macinfo_type == DW_MACRO_import_sup)
24759 struct dwz_file *dwz = dwarf2_get_dwz_file (dwarf2_per_objfile);
24761 dwarf2_read_section (objfile, &dwz->macro);
24763 include_section = &dwz->macro;
24764 include_bfd = get_section_bfd_owner (include_section);
24765 include_mac_end = dwz->macro.buffer + dwz->macro.size;
24769 new_mac_ptr = include_section->buffer + offset;
24770 slot = htab_find_slot (include_hash, new_mac_ptr, INSERT);
24774 /* This has actually happened; see
24775 http://sourceware.org/bugzilla/show_bug.cgi?id=13568. */
24776 complaint (_("recursive DW_MACRO_import in "
24777 ".debug_macro section"));
24781 *slot = (void *) new_mac_ptr;
24783 dwarf_decode_macro_bytes (cu, include_bfd, new_mac_ptr,
24784 include_mac_end, current_file, lh,
24785 section, section_is_gnu, is_dwz,
24786 offset_size, include_hash);
24788 htab_remove_elt (include_hash, (void *) new_mac_ptr);
24793 case DW_MACINFO_vendor_ext:
24794 if (!section_is_gnu)
24796 unsigned int bytes_read;
24798 /* This reads the constant, but since we don't recognize
24799 any vendor extensions, we ignore it. */
24800 read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
24801 mac_ptr += bytes_read;
24802 read_direct_string (abfd, mac_ptr, &bytes_read);
24803 mac_ptr += bytes_read;
24805 /* We don't recognize any vendor extensions. */
24811 mac_ptr = skip_unknown_opcode (macinfo_type, opcode_definitions,
24812 mac_ptr, mac_end, abfd, offset_size,
24814 if (mac_ptr == NULL)
24819 } while (macinfo_type != 0);
24823 dwarf_decode_macros (struct dwarf2_cu *cu, unsigned int offset,
24824 int section_is_gnu)
24826 struct dwarf2_per_objfile *dwarf2_per_objfile
24827 = cu->per_cu->dwarf2_per_objfile;
24828 struct objfile *objfile = dwarf2_per_objfile->objfile;
24829 struct line_header *lh = cu->line_header;
24831 const gdb_byte *mac_ptr, *mac_end;
24832 struct macro_source_file *current_file = 0;
24833 enum dwarf_macro_record_type macinfo_type;
24834 unsigned int offset_size = cu->header.offset_size;
24835 const gdb_byte *opcode_definitions[256];
24837 struct dwarf2_section_info *section;
24838 const char *section_name;
24840 if (cu->dwo_unit != NULL)
24842 if (section_is_gnu)
24844 section = &cu->dwo_unit->dwo_file->sections.macro;
24845 section_name = ".debug_macro.dwo";
24849 section = &cu->dwo_unit->dwo_file->sections.macinfo;
24850 section_name = ".debug_macinfo.dwo";
24855 if (section_is_gnu)
24857 section = &dwarf2_per_objfile->macro;
24858 section_name = ".debug_macro";
24862 section = &dwarf2_per_objfile->macinfo;
24863 section_name = ".debug_macinfo";
24867 dwarf2_read_section (objfile, section);
24868 if (section->buffer == NULL)
24870 complaint (_("missing %s section"), section_name);
24873 abfd = get_section_bfd_owner (section);
24875 /* First pass: Find the name of the base filename.
24876 This filename is needed in order to process all macros whose definition
24877 (or undefinition) comes from the command line. These macros are defined
24878 before the first DW_MACINFO_start_file entry, and yet still need to be
24879 associated to the base file.
24881 To determine the base file name, we scan the macro definitions until we
24882 reach the first DW_MACINFO_start_file entry. We then initialize
24883 CURRENT_FILE accordingly so that any macro definition found before the
24884 first DW_MACINFO_start_file can still be associated to the base file. */
24886 mac_ptr = section->buffer + offset;
24887 mac_end = section->buffer + section->size;
24889 mac_ptr = dwarf_parse_macro_header (opcode_definitions, abfd, mac_ptr,
24890 &offset_size, section_is_gnu);
24891 if (mac_ptr == NULL)
24893 /* We already issued a complaint. */
24899 /* Do we at least have room for a macinfo type byte? */
24900 if (mac_ptr >= mac_end)
24902 /* Complaint is printed during the second pass as GDB will probably
24903 stop the first pass earlier upon finding
24904 DW_MACINFO_start_file. */
24908 macinfo_type = (enum dwarf_macro_record_type) read_1_byte (abfd, mac_ptr);
24911 /* Note that we rely on the fact that the corresponding GNU and
24912 DWARF constants are the same. */
24914 DIAGNOSTIC_IGNORE_SWITCH_DIFFERENT_ENUM_TYPES
24915 switch (macinfo_type)
24917 /* A zero macinfo type indicates the end of the macro
24922 case DW_MACRO_define:
24923 case DW_MACRO_undef:
24924 /* Only skip the data by MAC_PTR. */
24926 unsigned int bytes_read;
24928 read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
24929 mac_ptr += bytes_read;
24930 read_direct_string (abfd, mac_ptr, &bytes_read);
24931 mac_ptr += bytes_read;
24935 case DW_MACRO_start_file:
24937 unsigned int bytes_read;
24940 line = read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
24941 mac_ptr += bytes_read;
24942 file = read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
24943 mac_ptr += bytes_read;
24945 current_file = macro_start_file (cu, file, line, current_file, lh);
24949 case DW_MACRO_end_file:
24950 /* No data to skip by MAC_PTR. */
24953 case DW_MACRO_define_strp:
24954 case DW_MACRO_undef_strp:
24955 case DW_MACRO_define_sup:
24956 case DW_MACRO_undef_sup:
24958 unsigned int bytes_read;
24960 read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
24961 mac_ptr += bytes_read;
24962 mac_ptr += offset_size;
24966 case DW_MACRO_import:
24967 case DW_MACRO_import_sup:
24968 /* Note that, according to the spec, a transparent include
24969 chain cannot call DW_MACRO_start_file. So, we can just
24970 skip this opcode. */
24971 mac_ptr += offset_size;
24974 case DW_MACINFO_vendor_ext:
24975 /* Only skip the data by MAC_PTR. */
24976 if (!section_is_gnu)
24978 unsigned int bytes_read;
24980 read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
24981 mac_ptr += bytes_read;
24982 read_direct_string (abfd, mac_ptr, &bytes_read);
24983 mac_ptr += bytes_read;
24988 mac_ptr = skip_unknown_opcode (macinfo_type, opcode_definitions,
24989 mac_ptr, mac_end, abfd, offset_size,
24991 if (mac_ptr == NULL)
24996 } while (macinfo_type != 0 && current_file == NULL);
24998 /* Second pass: Process all entries.
25000 Use the AT_COMMAND_LINE flag to determine whether we are still processing
25001 command-line macro definitions/undefinitions. This flag is unset when we
25002 reach the first DW_MACINFO_start_file entry. */
25004 htab_up include_hash (htab_create_alloc (1, htab_hash_pointer,
25006 NULL, xcalloc, xfree));
25007 mac_ptr = section->buffer + offset;
25008 slot = htab_find_slot (include_hash.get (), mac_ptr, INSERT);
25009 *slot = (void *) mac_ptr;
25010 dwarf_decode_macro_bytes (cu, abfd, mac_ptr, mac_end,
25011 current_file, lh, section,
25012 section_is_gnu, 0, offset_size,
25013 include_hash.get ());
25016 /* Check if the attribute's form is a DW_FORM_block*
25017 if so return true else false. */
25020 attr_form_is_block (const struct attribute *attr)
25022 return (attr == NULL ? 0 :
25023 attr->form == DW_FORM_block1
25024 || attr->form == DW_FORM_block2
25025 || attr->form == DW_FORM_block4
25026 || attr->form == DW_FORM_block
25027 || attr->form == DW_FORM_exprloc);
25030 /* Return non-zero if ATTR's value is a section offset --- classes
25031 lineptr, loclistptr, macptr or rangelistptr --- or zero, otherwise.
25032 You may use DW_UNSND (attr) to retrieve such offsets.
25034 Section 7.5.4, "Attribute Encodings", explains that no attribute
25035 may have a value that belongs to more than one of these classes; it
25036 would be ambiguous if we did, because we use the same forms for all
25040 attr_form_is_section_offset (const struct attribute *attr)
25042 return (attr->form == DW_FORM_data4
25043 || attr->form == DW_FORM_data8
25044 || attr->form == DW_FORM_sec_offset);
25047 /* Return non-zero if ATTR's value falls in the 'constant' class, or
25048 zero otherwise. When this function returns true, you can apply
25049 dwarf2_get_attr_constant_value to it.
25051 However, note that for some attributes you must check
25052 attr_form_is_section_offset before using this test. DW_FORM_data4
25053 and DW_FORM_data8 are members of both the constant class, and of
25054 the classes that contain offsets into other debug sections
25055 (lineptr, loclistptr, macptr or rangelistptr). The DWARF spec says
25056 that, if an attribute's can be either a constant or one of the
25057 section offset classes, DW_FORM_data4 and DW_FORM_data8 should be
25058 taken as section offsets, not constants.
25060 DW_FORM_data16 is not considered as dwarf2_get_attr_constant_value
25061 cannot handle that. */
25064 attr_form_is_constant (const struct attribute *attr)
25066 switch (attr->form)
25068 case DW_FORM_sdata:
25069 case DW_FORM_udata:
25070 case DW_FORM_data1:
25071 case DW_FORM_data2:
25072 case DW_FORM_data4:
25073 case DW_FORM_data8:
25074 case DW_FORM_implicit_const:
25082 /* DW_ADDR is always stored already as sect_offset; despite for the forms
25083 besides DW_FORM_ref_addr it is stored as cu_offset in the DWARF file. */
25086 attr_form_is_ref (const struct attribute *attr)
25088 switch (attr->form)
25090 case DW_FORM_ref_addr:
25095 case DW_FORM_ref_udata:
25096 case DW_FORM_GNU_ref_alt:
25103 /* Return the .debug_loc section to use for CU.
25104 For DWO files use .debug_loc.dwo. */
25106 static struct dwarf2_section_info *
25107 cu_debug_loc_section (struct dwarf2_cu *cu)
25109 struct dwarf2_per_objfile *dwarf2_per_objfile
25110 = cu->per_cu->dwarf2_per_objfile;
25114 struct dwo_sections *sections = &cu->dwo_unit->dwo_file->sections;
25116 return cu->header.version >= 5 ? §ions->loclists : §ions->loc;
25118 return (cu->header.version >= 5 ? &dwarf2_per_objfile->loclists
25119 : &dwarf2_per_objfile->loc);
25122 /* A helper function that fills in a dwarf2_loclist_baton. */
25125 fill_in_loclist_baton (struct dwarf2_cu *cu,
25126 struct dwarf2_loclist_baton *baton,
25127 const struct attribute *attr)
25129 struct dwarf2_per_objfile *dwarf2_per_objfile
25130 = cu->per_cu->dwarf2_per_objfile;
25131 struct dwarf2_section_info *section = cu_debug_loc_section (cu);
25133 dwarf2_read_section (dwarf2_per_objfile->objfile, section);
25135 baton->per_cu = cu->per_cu;
25136 gdb_assert (baton->per_cu);
25137 /* We don't know how long the location list is, but make sure we
25138 don't run off the edge of the section. */
25139 baton->size = section->size - DW_UNSND (attr);
25140 baton->data = section->buffer + DW_UNSND (attr);
25141 baton->base_address = cu->base_address;
25142 baton->from_dwo = cu->dwo_unit != NULL;
25146 dwarf2_symbol_mark_computed (const struct attribute *attr, struct symbol *sym,
25147 struct dwarf2_cu *cu, int is_block)
25149 struct dwarf2_per_objfile *dwarf2_per_objfile
25150 = cu->per_cu->dwarf2_per_objfile;
25151 struct objfile *objfile = dwarf2_per_objfile->objfile;
25152 struct dwarf2_section_info *section = cu_debug_loc_section (cu);
25154 if (attr_form_is_section_offset (attr)
25155 /* .debug_loc{,.dwo} may not exist at all, or the offset may be outside
25156 the section. If so, fall through to the complaint in the
25158 && DW_UNSND (attr) < dwarf2_section_size (objfile, section))
25160 struct dwarf2_loclist_baton *baton;
25162 baton = XOBNEW (&objfile->objfile_obstack, struct dwarf2_loclist_baton);
25164 fill_in_loclist_baton (cu, baton, attr);
25166 if (cu->base_known == 0)
25167 complaint (_("Location list used without "
25168 "specifying the CU base address."));
25170 SYMBOL_ACLASS_INDEX (sym) = (is_block
25171 ? dwarf2_loclist_block_index
25172 : dwarf2_loclist_index);
25173 SYMBOL_LOCATION_BATON (sym) = baton;
25177 struct dwarf2_locexpr_baton *baton;
25179 baton = XOBNEW (&objfile->objfile_obstack, struct dwarf2_locexpr_baton);
25180 baton->per_cu = cu->per_cu;
25181 gdb_assert (baton->per_cu);
25183 if (attr_form_is_block (attr))
25185 /* Note that we're just copying the block's data pointer
25186 here, not the actual data. We're still pointing into the
25187 info_buffer for SYM's objfile; right now we never release
25188 that buffer, but when we do clean up properly this may
25190 baton->size = DW_BLOCK (attr)->size;
25191 baton->data = DW_BLOCK (attr)->data;
25195 dwarf2_invalid_attrib_class_complaint ("location description",
25196 SYMBOL_NATURAL_NAME (sym));
25200 SYMBOL_ACLASS_INDEX (sym) = (is_block
25201 ? dwarf2_locexpr_block_index
25202 : dwarf2_locexpr_index);
25203 SYMBOL_LOCATION_BATON (sym) = baton;
25207 /* Return the OBJFILE associated with the compilation unit CU. If CU
25208 came from a separate debuginfo file, then the master objfile is
25212 dwarf2_per_cu_objfile (struct dwarf2_per_cu_data *per_cu)
25214 struct objfile *objfile = per_cu->dwarf2_per_objfile->objfile;
25216 /* Return the master objfile, so that we can report and look up the
25217 correct file containing this variable. */
25218 if (objfile->separate_debug_objfile_backlink)
25219 objfile = objfile->separate_debug_objfile_backlink;
25224 /* Return comp_unit_head for PER_CU, either already available in PER_CU->CU
25225 (CU_HEADERP is unused in such case) or prepare a temporary copy at
25226 CU_HEADERP first. */
25228 static const struct comp_unit_head *
25229 per_cu_header_read_in (struct comp_unit_head *cu_headerp,
25230 struct dwarf2_per_cu_data *per_cu)
25232 const gdb_byte *info_ptr;
25235 return &per_cu->cu->header;
25237 info_ptr = per_cu->section->buffer + to_underlying (per_cu->sect_off);
25239 memset (cu_headerp, 0, sizeof (*cu_headerp));
25240 read_comp_unit_head (cu_headerp, info_ptr, per_cu->section,
25241 rcuh_kind::COMPILE);
25246 /* Return the address size given in the compilation unit header for CU. */
25249 dwarf2_per_cu_addr_size (struct dwarf2_per_cu_data *per_cu)
25251 struct comp_unit_head cu_header_local;
25252 const struct comp_unit_head *cu_headerp;
25254 cu_headerp = per_cu_header_read_in (&cu_header_local, per_cu);
25256 return cu_headerp->addr_size;
25259 /* Return the offset size given in the compilation unit header for CU. */
25262 dwarf2_per_cu_offset_size (struct dwarf2_per_cu_data *per_cu)
25264 struct comp_unit_head cu_header_local;
25265 const struct comp_unit_head *cu_headerp;
25267 cu_headerp = per_cu_header_read_in (&cu_header_local, per_cu);
25269 return cu_headerp->offset_size;
25272 /* See its dwarf2loc.h declaration. */
25275 dwarf2_per_cu_ref_addr_size (struct dwarf2_per_cu_data *per_cu)
25277 struct comp_unit_head cu_header_local;
25278 const struct comp_unit_head *cu_headerp;
25280 cu_headerp = per_cu_header_read_in (&cu_header_local, per_cu);
25282 if (cu_headerp->version == 2)
25283 return cu_headerp->addr_size;
25285 return cu_headerp->offset_size;
25288 /* Return the text offset of the CU. The returned offset comes from
25289 this CU's objfile. If this objfile came from a separate debuginfo
25290 file, then the offset may be different from the corresponding
25291 offset in the parent objfile. */
25294 dwarf2_per_cu_text_offset (struct dwarf2_per_cu_data *per_cu)
25296 struct objfile *objfile = per_cu->dwarf2_per_objfile->objfile;
25298 return ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
25301 /* Return DWARF version number of PER_CU. */
25304 dwarf2_version (struct dwarf2_per_cu_data *per_cu)
25306 return per_cu->dwarf_version;
25309 /* Locate the .debug_info compilation unit from CU's objfile which contains
25310 the DIE at OFFSET. Raises an error on failure. */
25312 static struct dwarf2_per_cu_data *
25313 dwarf2_find_containing_comp_unit (sect_offset sect_off,
25314 unsigned int offset_in_dwz,
25315 struct dwarf2_per_objfile *dwarf2_per_objfile)
25317 struct dwarf2_per_cu_data *this_cu;
25321 high = dwarf2_per_objfile->all_comp_units.size () - 1;
25324 struct dwarf2_per_cu_data *mid_cu;
25325 int mid = low + (high - low) / 2;
25327 mid_cu = dwarf2_per_objfile->all_comp_units[mid];
25328 if (mid_cu->is_dwz > offset_in_dwz
25329 || (mid_cu->is_dwz == offset_in_dwz
25330 && mid_cu->sect_off + mid_cu->length >= sect_off))
25335 gdb_assert (low == high);
25336 this_cu = dwarf2_per_objfile->all_comp_units[low];
25337 if (this_cu->is_dwz != offset_in_dwz || this_cu->sect_off > sect_off)
25339 if (low == 0 || this_cu->is_dwz != offset_in_dwz)
25340 error (_("Dwarf Error: could not find partial DIE containing "
25341 "offset %s [in module %s]"),
25342 sect_offset_str (sect_off),
25343 bfd_get_filename (dwarf2_per_objfile->objfile->obfd));
25345 gdb_assert (dwarf2_per_objfile->all_comp_units[low-1]->sect_off
25347 return dwarf2_per_objfile->all_comp_units[low-1];
25351 if (low == dwarf2_per_objfile->all_comp_units.size () - 1
25352 && sect_off >= this_cu->sect_off + this_cu->length)
25353 error (_("invalid dwarf2 offset %s"), sect_offset_str (sect_off));
25354 gdb_assert (sect_off < this_cu->sect_off + this_cu->length);
25359 /* Initialize dwarf2_cu CU, owned by PER_CU. */
25361 dwarf2_cu::dwarf2_cu (struct dwarf2_per_cu_data *per_cu_)
25362 : per_cu (per_cu_),
25364 has_loclist (false),
25365 checked_producer (false),
25366 producer_is_gxx_lt_4_6 (false),
25367 producer_is_gcc_lt_4_3 (false),
25368 producer_is_icc (false),
25369 producer_is_icc_lt_14 (false),
25370 producer_is_codewarrior (false),
25371 processing_has_namespace_info (false)
25376 /* Destroy a dwarf2_cu. */
25378 dwarf2_cu::~dwarf2_cu ()
25383 /* Initialize basic fields of dwarf_cu CU according to DIE COMP_UNIT_DIE. */
25386 prepare_one_comp_unit (struct dwarf2_cu *cu, struct die_info *comp_unit_die,
25387 enum language pretend_language)
25389 struct attribute *attr;
25391 /* Set the language we're debugging. */
25392 attr = dwarf2_attr (comp_unit_die, DW_AT_language, cu);
25394 set_cu_language (DW_UNSND (attr), cu);
25397 cu->language = pretend_language;
25398 cu->language_defn = language_def (cu->language);
25401 cu->producer = dwarf2_string_attr (comp_unit_die, DW_AT_producer, cu);
25404 /* Increase the age counter on each cached compilation unit, and free
25405 any that are too old. */
25408 age_cached_comp_units (struct dwarf2_per_objfile *dwarf2_per_objfile)
25410 struct dwarf2_per_cu_data *per_cu, **last_chain;
25412 dwarf2_clear_marks (dwarf2_per_objfile->read_in_chain);
25413 per_cu = dwarf2_per_objfile->read_in_chain;
25414 while (per_cu != NULL)
25416 per_cu->cu->last_used ++;
25417 if (per_cu->cu->last_used <= dwarf_max_cache_age)
25418 dwarf2_mark (per_cu->cu);
25419 per_cu = per_cu->cu->read_in_chain;
25422 per_cu = dwarf2_per_objfile->read_in_chain;
25423 last_chain = &dwarf2_per_objfile->read_in_chain;
25424 while (per_cu != NULL)
25426 struct dwarf2_per_cu_data *next_cu;
25428 next_cu = per_cu->cu->read_in_chain;
25430 if (!per_cu->cu->mark)
25433 *last_chain = next_cu;
25436 last_chain = &per_cu->cu->read_in_chain;
25442 /* Remove a single compilation unit from the cache. */
25445 free_one_cached_comp_unit (struct dwarf2_per_cu_data *target_per_cu)
25447 struct dwarf2_per_cu_data *per_cu, **last_chain;
25448 struct dwarf2_per_objfile *dwarf2_per_objfile
25449 = target_per_cu->dwarf2_per_objfile;
25451 per_cu = dwarf2_per_objfile->read_in_chain;
25452 last_chain = &dwarf2_per_objfile->read_in_chain;
25453 while (per_cu != NULL)
25455 struct dwarf2_per_cu_data *next_cu;
25457 next_cu = per_cu->cu->read_in_chain;
25459 if (per_cu == target_per_cu)
25463 *last_chain = next_cu;
25467 last_chain = &per_cu->cu->read_in_chain;
25473 /* A set of CU "per_cu" pointer, DIE offset, and GDB type pointer.
25474 We store these in a hash table separate from the DIEs, and preserve them
25475 when the DIEs are flushed out of cache.
25477 The CU "per_cu" pointer is needed because offset alone is not enough to
25478 uniquely identify the type. A file may have multiple .debug_types sections,
25479 or the type may come from a DWO file. Furthermore, while it's more logical
25480 to use per_cu->section+offset, with Fission the section with the data is in
25481 the DWO file but we don't know that section at the point we need it.
25482 We have to use something in dwarf2_per_cu_data (or the pointer to it)
25483 because we can enter the lookup routine, get_die_type_at_offset, from
25484 outside this file, and thus won't necessarily have PER_CU->cu.
25485 Fortunately, PER_CU is stable for the life of the objfile. */
25487 struct dwarf2_per_cu_offset_and_type
25489 const struct dwarf2_per_cu_data *per_cu;
25490 sect_offset sect_off;
25494 /* Hash function for a dwarf2_per_cu_offset_and_type. */
25497 per_cu_offset_and_type_hash (const void *item)
25499 const struct dwarf2_per_cu_offset_and_type *ofs
25500 = (const struct dwarf2_per_cu_offset_and_type *) item;
25502 return (uintptr_t) ofs->per_cu + to_underlying (ofs->sect_off);
25505 /* Equality function for a dwarf2_per_cu_offset_and_type. */
25508 per_cu_offset_and_type_eq (const void *item_lhs, const void *item_rhs)
25510 const struct dwarf2_per_cu_offset_and_type *ofs_lhs
25511 = (const struct dwarf2_per_cu_offset_and_type *) item_lhs;
25512 const struct dwarf2_per_cu_offset_and_type *ofs_rhs
25513 = (const struct dwarf2_per_cu_offset_and_type *) item_rhs;
25515 return (ofs_lhs->per_cu == ofs_rhs->per_cu
25516 && ofs_lhs->sect_off == ofs_rhs->sect_off);
25519 /* Set the type associated with DIE to TYPE. Save it in CU's hash
25520 table if necessary. For convenience, return TYPE.
25522 The DIEs reading must have careful ordering to:
25523 * Not cause infite loops trying to read in DIEs as a prerequisite for
25524 reading current DIE.
25525 * Not trying to dereference contents of still incompletely read in types
25526 while reading in other DIEs.
25527 * Enable referencing still incompletely read in types just by a pointer to
25528 the type without accessing its fields.
25530 Therefore caller should follow these rules:
25531 * Try to fetch any prerequisite types we may need to build this DIE type
25532 before building the type and calling set_die_type.
25533 * After building type call set_die_type for current DIE as soon as
25534 possible before fetching more types to complete the current type.
25535 * Make the type as complete as possible before fetching more types. */
25537 static struct type *
25538 set_die_type (struct die_info *die, struct type *type, struct dwarf2_cu *cu)
25540 struct dwarf2_per_objfile *dwarf2_per_objfile
25541 = cu->per_cu->dwarf2_per_objfile;
25542 struct dwarf2_per_cu_offset_and_type **slot, ofs;
25543 struct objfile *objfile = dwarf2_per_objfile->objfile;
25544 struct attribute *attr;
25545 struct dynamic_prop prop;
25547 /* For Ada types, make sure that the gnat-specific data is always
25548 initialized (if not already set). There are a few types where
25549 we should not be doing so, because the type-specific area is
25550 already used to hold some other piece of info (eg: TYPE_CODE_FLT
25551 where the type-specific area is used to store the floatformat).
25552 But this is not a problem, because the gnat-specific information
25553 is actually not needed for these types. */
25554 if (need_gnat_info (cu)
25555 && TYPE_CODE (type) != TYPE_CODE_FUNC
25556 && TYPE_CODE (type) != TYPE_CODE_FLT
25557 && TYPE_CODE (type) != TYPE_CODE_METHODPTR
25558 && TYPE_CODE (type) != TYPE_CODE_MEMBERPTR
25559 && TYPE_CODE (type) != TYPE_CODE_METHOD
25560 && !HAVE_GNAT_AUX_INFO (type))
25561 INIT_GNAT_SPECIFIC (type);
25563 /* Read DW_AT_allocated and set in type. */
25564 attr = dwarf2_attr (die, DW_AT_allocated, cu);
25565 if (attr_form_is_block (attr))
25567 if (attr_to_dynamic_prop (attr, die, cu, &prop))
25568 add_dyn_prop (DYN_PROP_ALLOCATED, prop, type);
25570 else if (attr != NULL)
25572 complaint (_("DW_AT_allocated has the wrong form (%s) at DIE %s"),
25573 (attr != NULL ? dwarf_form_name (attr->form) : "n/a"),
25574 sect_offset_str (die->sect_off));
25577 /* Read DW_AT_associated and set in type. */
25578 attr = dwarf2_attr (die, DW_AT_associated, cu);
25579 if (attr_form_is_block (attr))
25581 if (attr_to_dynamic_prop (attr, die, cu, &prop))
25582 add_dyn_prop (DYN_PROP_ASSOCIATED, prop, type);
25584 else if (attr != NULL)
25586 complaint (_("DW_AT_associated has the wrong form (%s) at DIE %s"),
25587 (attr != NULL ? dwarf_form_name (attr->form) : "n/a"),
25588 sect_offset_str (die->sect_off));
25591 /* Read DW_AT_data_location and set in type. */
25592 attr = dwarf2_attr (die, DW_AT_data_location, cu);
25593 if (attr_to_dynamic_prop (attr, die, cu, &prop))
25594 add_dyn_prop (DYN_PROP_DATA_LOCATION, prop, type);
25596 if (dwarf2_per_objfile->die_type_hash == NULL)
25598 dwarf2_per_objfile->die_type_hash =
25599 htab_create_alloc_ex (127,
25600 per_cu_offset_and_type_hash,
25601 per_cu_offset_and_type_eq,
25603 &objfile->objfile_obstack,
25604 hashtab_obstack_allocate,
25605 dummy_obstack_deallocate);
25608 ofs.per_cu = cu->per_cu;
25609 ofs.sect_off = die->sect_off;
25611 slot = (struct dwarf2_per_cu_offset_and_type **)
25612 htab_find_slot (dwarf2_per_objfile->die_type_hash, &ofs, INSERT);
25614 complaint (_("A problem internal to GDB: DIE %s has type already set"),
25615 sect_offset_str (die->sect_off));
25616 *slot = XOBNEW (&objfile->objfile_obstack,
25617 struct dwarf2_per_cu_offset_and_type);
25622 /* Look up the type for the die at SECT_OFF in PER_CU in die_type_hash,
25623 or return NULL if the die does not have a saved type. */
25625 static struct type *
25626 get_die_type_at_offset (sect_offset sect_off,
25627 struct dwarf2_per_cu_data *per_cu)
25629 struct dwarf2_per_cu_offset_and_type *slot, ofs;
25630 struct dwarf2_per_objfile *dwarf2_per_objfile = per_cu->dwarf2_per_objfile;
25632 if (dwarf2_per_objfile->die_type_hash == NULL)
25635 ofs.per_cu = per_cu;
25636 ofs.sect_off = sect_off;
25637 slot = ((struct dwarf2_per_cu_offset_and_type *)
25638 htab_find (dwarf2_per_objfile->die_type_hash, &ofs));
25645 /* Look up the type for DIE in CU in die_type_hash,
25646 or return NULL if DIE does not have a saved type. */
25648 static struct type *
25649 get_die_type (struct die_info *die, struct dwarf2_cu *cu)
25651 return get_die_type_at_offset (die->sect_off, cu->per_cu);
25654 /* Add a dependence relationship from CU to REF_PER_CU. */
25657 dwarf2_add_dependence (struct dwarf2_cu *cu,
25658 struct dwarf2_per_cu_data *ref_per_cu)
25662 if (cu->dependencies == NULL)
25664 = htab_create_alloc_ex (5, htab_hash_pointer, htab_eq_pointer,
25665 NULL, &cu->comp_unit_obstack,
25666 hashtab_obstack_allocate,
25667 dummy_obstack_deallocate);
25669 slot = htab_find_slot (cu->dependencies, ref_per_cu, INSERT);
25671 *slot = ref_per_cu;
25674 /* Subroutine of dwarf2_mark to pass to htab_traverse.
25675 Set the mark field in every compilation unit in the
25676 cache that we must keep because we are keeping CU. */
25679 dwarf2_mark_helper (void **slot, void *data)
25681 struct dwarf2_per_cu_data *per_cu;
25683 per_cu = (struct dwarf2_per_cu_data *) *slot;
25685 /* cu->dependencies references may not yet have been ever read if QUIT aborts
25686 reading of the chain. As such dependencies remain valid it is not much
25687 useful to track and undo them during QUIT cleanups. */
25688 if (per_cu->cu == NULL)
25691 if (per_cu->cu->mark)
25693 per_cu->cu->mark = true;
25695 if (per_cu->cu->dependencies != NULL)
25696 htab_traverse (per_cu->cu->dependencies, dwarf2_mark_helper, NULL);
25701 /* Set the mark field in CU and in every other compilation unit in the
25702 cache that we must keep because we are keeping CU. */
25705 dwarf2_mark (struct dwarf2_cu *cu)
25710 if (cu->dependencies != NULL)
25711 htab_traverse (cu->dependencies, dwarf2_mark_helper, NULL);
25715 dwarf2_clear_marks (struct dwarf2_per_cu_data *per_cu)
25719 per_cu->cu->mark = false;
25720 per_cu = per_cu->cu->read_in_chain;
25724 /* Trivial hash function for partial_die_info: the hash value of a DIE
25725 is its offset in .debug_info for this objfile. */
25728 partial_die_hash (const void *item)
25730 const struct partial_die_info *part_die
25731 = (const struct partial_die_info *) item;
25733 return to_underlying (part_die->sect_off);
25736 /* Trivial comparison function for partial_die_info structures: two DIEs
25737 are equal if they have the same offset. */
25740 partial_die_eq (const void *item_lhs, const void *item_rhs)
25742 const struct partial_die_info *part_die_lhs
25743 = (const struct partial_die_info *) item_lhs;
25744 const struct partial_die_info *part_die_rhs
25745 = (const struct partial_die_info *) item_rhs;
25747 return part_die_lhs->sect_off == part_die_rhs->sect_off;
25750 struct cmd_list_element *set_dwarf_cmdlist;
25751 struct cmd_list_element *show_dwarf_cmdlist;
25754 set_dwarf_cmd (const char *args, int from_tty)
25756 help_list (set_dwarf_cmdlist, "maintenance set dwarf ", all_commands,
25761 show_dwarf_cmd (const char *args, int from_tty)
25763 cmd_show_list (show_dwarf_cmdlist, from_tty, "");
25766 int dwarf_always_disassemble;
25769 show_dwarf_always_disassemble (struct ui_file *file, int from_tty,
25770 struct cmd_list_element *c, const char *value)
25772 fprintf_filtered (file,
25773 _("Whether to always disassemble "
25774 "DWARF expressions is %s.\n"),
25779 show_check_physname (struct ui_file *file, int from_tty,
25780 struct cmd_list_element *c, const char *value)
25782 fprintf_filtered (file,
25783 _("Whether to check \"physname\" is %s.\n"),
25788 _initialize_dwarf2_read (void)
25790 add_prefix_cmd ("dwarf", class_maintenance, set_dwarf_cmd, _("\
25791 Set DWARF specific variables.\n\
25792 Configure DWARF variables such as the cache size"),
25793 &set_dwarf_cmdlist, "maintenance set dwarf ",
25794 0/*allow-unknown*/, &maintenance_set_cmdlist);
25796 add_prefix_cmd ("dwarf", class_maintenance, show_dwarf_cmd, _("\
25797 Show DWARF specific variables\n\
25798 Show DWARF variables such as the cache size"),
25799 &show_dwarf_cmdlist, "maintenance show dwarf ",
25800 0/*allow-unknown*/, &maintenance_show_cmdlist);
25802 add_setshow_zinteger_cmd ("max-cache-age", class_obscure,
25803 &dwarf_max_cache_age, _("\
25804 Set the upper bound on the age of cached DWARF compilation units."), _("\
25805 Show the upper bound on the age of cached DWARF compilation units."), _("\
25806 A higher limit means that cached compilation units will be stored\n\
25807 in memory longer, and more total memory will be used. Zero disables\n\
25808 caching, which can slow down startup."),
25810 show_dwarf_max_cache_age,
25811 &set_dwarf_cmdlist,
25812 &show_dwarf_cmdlist);
25814 add_setshow_boolean_cmd ("always-disassemble", class_obscure,
25815 &dwarf_always_disassemble, _("\
25816 Set whether `info address' always disassembles DWARF expressions."), _("\
25817 Show whether `info address' always disassembles DWARF expressions."), _("\
25818 When enabled, DWARF expressions are always printed in an assembly-like\n\
25819 syntax. When disabled, expressions will be printed in a more\n\
25820 conversational style, when possible."),
25822 show_dwarf_always_disassemble,
25823 &set_dwarf_cmdlist,
25824 &show_dwarf_cmdlist);
25826 add_setshow_zuinteger_cmd ("dwarf-read", no_class, &dwarf_read_debug, _("\
25827 Set debugging of the DWARF reader."), _("\
25828 Show debugging of the DWARF reader."), _("\
25829 When enabled (non-zero), debugging messages are printed during DWARF\n\
25830 reading and symtab expansion. A value of 1 (one) provides basic\n\
25831 information. A value greater than 1 provides more verbose information."),
25834 &setdebuglist, &showdebuglist);
25836 add_setshow_zuinteger_cmd ("dwarf-die", no_class, &dwarf_die_debug, _("\
25837 Set debugging of the DWARF DIE reader."), _("\
25838 Show debugging of the DWARF DIE reader."), _("\
25839 When enabled (non-zero), DIEs are dumped after they are read in.\n\
25840 The value is the maximum depth to print."),
25843 &setdebuglist, &showdebuglist);
25845 add_setshow_zuinteger_cmd ("dwarf-line", no_class, &dwarf_line_debug, _("\
25846 Set debugging of the dwarf line reader."), _("\
25847 Show debugging of the dwarf line reader."), _("\
25848 When enabled (non-zero), line number entries are dumped as they are read in.\n\
25849 A value of 1 (one) provides basic information.\n\
25850 A value greater than 1 provides more verbose information."),
25853 &setdebuglist, &showdebuglist);
25855 add_setshow_boolean_cmd ("check-physname", no_class, &check_physname, _("\
25856 Set cross-checking of \"physname\" code against demangler."), _("\
25857 Show cross-checking of \"physname\" code against demangler."), _("\
25858 When enabled, GDB's internal \"physname\" code is checked against\n\
25860 NULL, show_check_physname,
25861 &setdebuglist, &showdebuglist);
25863 add_setshow_boolean_cmd ("use-deprecated-index-sections",
25864 no_class, &use_deprecated_index_sections, _("\
25865 Set whether to use deprecated gdb_index sections."), _("\
25866 Show whether to use deprecated gdb_index sections."), _("\
25867 When enabled, deprecated .gdb_index sections are used anyway.\n\
25868 Normally they are ignored either because of a missing feature or\n\
25869 performance issue.\n\
25870 Warning: This option must be enabled before gdb reads the file."),
25873 &setlist, &showlist);
25875 dwarf2_locexpr_index = register_symbol_computed_impl (LOC_COMPUTED,
25876 &dwarf2_locexpr_funcs);
25877 dwarf2_loclist_index = register_symbol_computed_impl (LOC_COMPUTED,
25878 &dwarf2_loclist_funcs);
25880 dwarf2_locexpr_block_index = register_symbol_block_impl (LOC_BLOCK,
25881 &dwarf2_block_frame_base_locexpr_funcs);
25882 dwarf2_loclist_block_index = register_symbol_block_impl (LOC_BLOCK,
25883 &dwarf2_block_frame_base_loclist_funcs);
25886 selftests::register_test ("dw2_expand_symtabs_matching",
25887 selftests::dw2_expand_symtabs_matching::run_test);