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 (dwarf2_flag_true_p (die, DW_AT_main_subprogram, cu))
13750 set_objfile_main_name (objfile, SYMBOL_LINKAGE_NAME (newobj->name),
13753 /* If there is a location expression for DW_AT_frame_base, record
13755 attr = dwarf2_attr (die, DW_AT_frame_base, cu);
13757 dwarf2_symbol_mark_computed (attr, newobj->name, cu, 1);
13759 /* If there is a location for the static link, record it. */
13760 newobj->static_link = NULL;
13761 attr = dwarf2_attr (die, DW_AT_static_link, cu);
13764 newobj->static_link
13765 = XOBNEW (&objfile->objfile_obstack, struct dynamic_prop);
13766 attr_to_dynamic_prop (attr, die, cu, newobj->static_link);
13769 cu->list_in_scope = cu->get_builder ()->get_local_symbols ();
13771 if (die->child != NULL)
13773 child_die = die->child;
13774 while (child_die && child_die->tag)
13776 if (child_die->tag == DW_TAG_template_type_param
13777 || child_die->tag == DW_TAG_template_value_param)
13779 struct symbol *arg = new_symbol (child_die, NULL, cu);
13782 template_args.push_back (arg);
13785 process_die (child_die, cu);
13786 child_die = sibling_die (child_die);
13790 inherit_abstract_dies (die, cu);
13792 /* If we have a DW_AT_specification, we might need to import using
13793 directives from the context of the specification DIE. See the
13794 comment in determine_prefix. */
13795 if (cu->language == language_cplus
13796 && dwarf2_attr (die, DW_AT_specification, cu))
13798 struct dwarf2_cu *spec_cu = cu;
13799 struct die_info *spec_die = die_specification (die, &spec_cu);
13803 child_die = spec_die->child;
13804 while (child_die && child_die->tag)
13806 if (child_die->tag == DW_TAG_imported_module)
13807 process_die (child_die, spec_cu);
13808 child_die = sibling_die (child_die);
13811 /* In some cases, GCC generates specification DIEs that
13812 themselves contain DW_AT_specification attributes. */
13813 spec_die = die_specification (spec_die, &spec_cu);
13817 struct context_stack cstk = cu->get_builder ()->pop_context ();
13818 /* Make a block for the local symbols within. */
13819 block = cu->get_builder ()->finish_block (cstk.name, cstk.old_blocks,
13820 cstk.static_link, lowpc, highpc);
13822 /* For C++, set the block's scope. */
13823 if ((cu->language == language_cplus
13824 || cu->language == language_fortran
13825 || cu->language == language_d
13826 || cu->language == language_rust)
13827 && cu->processing_has_namespace_info)
13828 block_set_scope (block, determine_prefix (die, cu),
13829 &objfile->objfile_obstack);
13831 /* If we have address ranges, record them. */
13832 dwarf2_record_block_ranges (die, block, baseaddr, cu);
13834 gdbarch_make_symbol_special (gdbarch, cstk.name, objfile);
13836 /* Attach template arguments to function. */
13837 if (!template_args.empty ())
13839 gdb_assert (templ_func != NULL);
13841 templ_func->n_template_arguments = template_args.size ();
13842 templ_func->template_arguments
13843 = XOBNEWVEC (&objfile->objfile_obstack, struct symbol *,
13844 templ_func->n_template_arguments);
13845 memcpy (templ_func->template_arguments,
13846 template_args.data (),
13847 (templ_func->n_template_arguments * sizeof (struct symbol *)));
13849 /* Make sure that the symtab is set on the new symbols. Even
13850 though they don't appear in this symtab directly, other parts
13851 of gdb assume that symbols do, and this is reasonably
13853 for (symbol *sym : template_args)
13854 symbol_set_symtab (sym, symbol_symtab (templ_func));
13857 /* In C++, we can have functions nested inside functions (e.g., when
13858 a function declares a class that has methods). This means that
13859 when we finish processing a function scope, we may need to go
13860 back to building a containing block's symbol lists. */
13861 *cu->get_builder ()->get_local_symbols () = cstk.locals;
13862 cu->get_builder ()->set_local_using_directives (cstk.local_using_directives);
13864 /* If we've finished processing a top-level function, subsequent
13865 symbols go in the file symbol list. */
13866 if (cu->get_builder ()->outermost_context_p ())
13867 cu->list_in_scope = cu->get_builder ()->get_file_symbols ();
13870 /* Process all the DIES contained within a lexical block scope. Start
13871 a new scope, process the dies, and then close the scope. */
13874 read_lexical_block_scope (struct die_info *die, struct dwarf2_cu *cu)
13876 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
13877 struct gdbarch *gdbarch = get_objfile_arch (objfile);
13878 CORE_ADDR lowpc, highpc;
13879 struct die_info *child_die;
13880 CORE_ADDR baseaddr;
13882 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
13884 /* Ignore blocks with missing or invalid low and high pc attributes. */
13885 /* ??? Perhaps consider discontiguous blocks defined by DW_AT_ranges
13886 as multiple lexical blocks? Handling children in a sane way would
13887 be nasty. Might be easier to properly extend generic blocks to
13888 describe ranges. */
13889 switch (dwarf2_get_pc_bounds (die, &lowpc, &highpc, cu, NULL))
13891 case PC_BOUNDS_NOT_PRESENT:
13892 /* DW_TAG_lexical_block has no attributes, process its children as if
13893 there was no wrapping by that DW_TAG_lexical_block.
13894 GCC does no longer produces such DWARF since GCC r224161. */
13895 for (child_die = die->child;
13896 child_die != NULL && child_die->tag;
13897 child_die = sibling_die (child_die))
13898 process_die (child_die, cu);
13900 case PC_BOUNDS_INVALID:
13903 lowpc = gdbarch_adjust_dwarf2_addr (gdbarch, lowpc + baseaddr);
13904 highpc = gdbarch_adjust_dwarf2_addr (gdbarch, highpc + baseaddr);
13906 cu->get_builder ()->push_context (0, lowpc);
13907 if (die->child != NULL)
13909 child_die = die->child;
13910 while (child_die && child_die->tag)
13912 process_die (child_die, cu);
13913 child_die = sibling_die (child_die);
13916 inherit_abstract_dies (die, cu);
13917 struct context_stack cstk = cu->get_builder ()->pop_context ();
13919 if (*cu->get_builder ()->get_local_symbols () != NULL
13920 || (*cu->get_builder ()->get_local_using_directives ()) != NULL)
13922 struct block *block
13923 = cu->get_builder ()->finish_block (0, cstk.old_blocks, NULL,
13924 cstk.start_addr, highpc);
13926 /* Note that recording ranges after traversing children, as we
13927 do here, means that recording a parent's ranges entails
13928 walking across all its children's ranges as they appear in
13929 the address map, which is quadratic behavior.
13931 It would be nicer to record the parent's ranges before
13932 traversing its children, simply overriding whatever you find
13933 there. But since we don't even decide whether to create a
13934 block until after we've traversed its children, that's hard
13936 dwarf2_record_block_ranges (die, block, baseaddr, cu);
13938 *cu->get_builder ()->get_local_symbols () = cstk.locals;
13939 cu->get_builder ()->set_local_using_directives (cstk.local_using_directives);
13942 /* Read in DW_TAG_call_site and insert it to CU->call_site_htab. */
13945 read_call_site_scope (struct die_info *die, struct dwarf2_cu *cu)
13947 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
13948 struct gdbarch *gdbarch = get_objfile_arch (objfile);
13949 CORE_ADDR pc, baseaddr;
13950 struct attribute *attr;
13951 struct call_site *call_site, call_site_local;
13954 struct die_info *child_die;
13956 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
13958 attr = dwarf2_attr (die, DW_AT_call_return_pc, cu);
13961 /* This was a pre-DWARF-5 GNU extension alias
13962 for DW_AT_call_return_pc. */
13963 attr = dwarf2_attr (die, DW_AT_low_pc, cu);
13967 complaint (_("missing DW_AT_call_return_pc for DW_TAG_call_site "
13968 "DIE %s [in module %s]"),
13969 sect_offset_str (die->sect_off), objfile_name (objfile));
13972 pc = attr_value_as_address (attr) + baseaddr;
13973 pc = gdbarch_adjust_dwarf2_addr (gdbarch, pc);
13975 if (cu->call_site_htab == NULL)
13976 cu->call_site_htab = htab_create_alloc_ex (16, core_addr_hash, core_addr_eq,
13977 NULL, &objfile->objfile_obstack,
13978 hashtab_obstack_allocate, NULL);
13979 call_site_local.pc = pc;
13980 slot = htab_find_slot (cu->call_site_htab, &call_site_local, INSERT);
13983 complaint (_("Duplicate PC %s for DW_TAG_call_site "
13984 "DIE %s [in module %s]"),
13985 paddress (gdbarch, pc), sect_offset_str (die->sect_off),
13986 objfile_name (objfile));
13990 /* Count parameters at the caller. */
13993 for (child_die = die->child; child_die && child_die->tag;
13994 child_die = sibling_die (child_die))
13996 if (child_die->tag != DW_TAG_call_site_parameter
13997 && child_die->tag != DW_TAG_GNU_call_site_parameter)
13999 complaint (_("Tag %d is not DW_TAG_call_site_parameter in "
14000 "DW_TAG_call_site child DIE %s [in module %s]"),
14001 child_die->tag, sect_offset_str (child_die->sect_off),
14002 objfile_name (objfile));
14010 = ((struct call_site *)
14011 obstack_alloc (&objfile->objfile_obstack,
14012 sizeof (*call_site)
14013 + (sizeof (*call_site->parameter) * (nparams - 1))));
14015 memset (call_site, 0, sizeof (*call_site) - sizeof (*call_site->parameter));
14016 call_site->pc = pc;
14018 if (dwarf2_flag_true_p (die, DW_AT_call_tail_call, cu)
14019 || dwarf2_flag_true_p (die, DW_AT_GNU_tail_call, cu))
14021 struct die_info *func_die;
14023 /* Skip also over DW_TAG_inlined_subroutine. */
14024 for (func_die = die->parent;
14025 func_die && func_die->tag != DW_TAG_subprogram
14026 && func_die->tag != DW_TAG_subroutine_type;
14027 func_die = func_die->parent);
14029 /* DW_AT_call_all_calls is a superset
14030 of DW_AT_call_all_tail_calls. */
14032 && !dwarf2_flag_true_p (func_die, DW_AT_call_all_calls, cu)
14033 && !dwarf2_flag_true_p (func_die, DW_AT_GNU_all_call_sites, cu)
14034 && !dwarf2_flag_true_p (func_die, DW_AT_call_all_tail_calls, cu)
14035 && !dwarf2_flag_true_p (func_die, DW_AT_GNU_all_tail_call_sites, cu))
14037 /* TYPE_TAIL_CALL_LIST is not interesting in functions where it is
14038 not complete. But keep CALL_SITE for look ups via call_site_htab,
14039 both the initial caller containing the real return address PC and
14040 the final callee containing the current PC of a chain of tail
14041 calls do not need to have the tail call list complete. But any
14042 function candidate for a virtual tail call frame searched via
14043 TYPE_TAIL_CALL_LIST must have the tail call list complete to be
14044 determined unambiguously. */
14048 struct type *func_type = NULL;
14051 func_type = get_die_type (func_die, cu);
14052 if (func_type != NULL)
14054 gdb_assert (TYPE_CODE (func_type) == TYPE_CODE_FUNC);
14056 /* Enlist this call site to the function. */
14057 call_site->tail_call_next = TYPE_TAIL_CALL_LIST (func_type);
14058 TYPE_TAIL_CALL_LIST (func_type) = call_site;
14061 complaint (_("Cannot find function owning DW_TAG_call_site "
14062 "DIE %s [in module %s]"),
14063 sect_offset_str (die->sect_off), objfile_name (objfile));
14067 attr = dwarf2_attr (die, DW_AT_call_target, cu);
14069 attr = dwarf2_attr (die, DW_AT_GNU_call_site_target, cu);
14071 attr = dwarf2_attr (die, DW_AT_call_origin, cu);
14074 /* This was a pre-DWARF-5 GNU extension alias for DW_AT_call_origin. */
14075 attr = dwarf2_attr (die, DW_AT_abstract_origin, cu);
14077 SET_FIELD_DWARF_BLOCK (call_site->target, NULL);
14078 if (!attr || (attr_form_is_block (attr) && DW_BLOCK (attr)->size == 0))
14079 /* Keep NULL DWARF_BLOCK. */;
14080 else if (attr_form_is_block (attr))
14082 struct dwarf2_locexpr_baton *dlbaton;
14084 dlbaton = XOBNEW (&objfile->objfile_obstack, struct dwarf2_locexpr_baton);
14085 dlbaton->data = DW_BLOCK (attr)->data;
14086 dlbaton->size = DW_BLOCK (attr)->size;
14087 dlbaton->per_cu = cu->per_cu;
14089 SET_FIELD_DWARF_BLOCK (call_site->target, dlbaton);
14091 else if (attr_form_is_ref (attr))
14093 struct dwarf2_cu *target_cu = cu;
14094 struct die_info *target_die;
14096 target_die = follow_die_ref (die, attr, &target_cu);
14097 gdb_assert (target_cu->per_cu->dwarf2_per_objfile->objfile == objfile);
14098 if (die_is_declaration (target_die, target_cu))
14100 const char *target_physname;
14102 /* Prefer the mangled name; otherwise compute the demangled one. */
14103 target_physname = dw2_linkage_name (target_die, target_cu);
14104 if (target_physname == NULL)
14105 target_physname = dwarf2_physname (NULL, target_die, target_cu);
14106 if (target_physname == NULL)
14107 complaint (_("DW_AT_call_target target DIE has invalid "
14108 "physname, for referencing DIE %s [in module %s]"),
14109 sect_offset_str (die->sect_off), objfile_name (objfile));
14111 SET_FIELD_PHYSNAME (call_site->target, target_physname);
14117 /* DW_AT_entry_pc should be preferred. */
14118 if (dwarf2_get_pc_bounds (target_die, &lowpc, NULL, target_cu, NULL)
14119 <= PC_BOUNDS_INVALID)
14120 complaint (_("DW_AT_call_target target DIE has invalid "
14121 "low pc, for referencing DIE %s [in module %s]"),
14122 sect_offset_str (die->sect_off), objfile_name (objfile));
14125 lowpc = gdbarch_adjust_dwarf2_addr (gdbarch, lowpc + baseaddr);
14126 SET_FIELD_PHYSADDR (call_site->target, lowpc);
14131 complaint (_("DW_TAG_call_site DW_AT_call_target is neither "
14132 "block nor reference, for DIE %s [in module %s]"),
14133 sect_offset_str (die->sect_off), objfile_name (objfile));
14135 call_site->per_cu = cu->per_cu;
14137 for (child_die = die->child;
14138 child_die && child_die->tag;
14139 child_die = sibling_die (child_die))
14141 struct call_site_parameter *parameter;
14142 struct attribute *loc, *origin;
14144 if (child_die->tag != DW_TAG_call_site_parameter
14145 && child_die->tag != DW_TAG_GNU_call_site_parameter)
14147 /* Already printed the complaint above. */
14151 gdb_assert (call_site->parameter_count < nparams);
14152 parameter = &call_site->parameter[call_site->parameter_count];
14154 /* DW_AT_location specifies the register number or DW_AT_abstract_origin
14155 specifies DW_TAG_formal_parameter. Value of the data assumed for the
14156 register is contained in DW_AT_call_value. */
14158 loc = dwarf2_attr (child_die, DW_AT_location, cu);
14159 origin = dwarf2_attr (child_die, DW_AT_call_parameter, cu);
14160 if (origin == NULL)
14162 /* This was a pre-DWARF-5 GNU extension alias
14163 for DW_AT_call_parameter. */
14164 origin = dwarf2_attr (child_die, DW_AT_abstract_origin, cu);
14166 if (loc == NULL && origin != NULL && attr_form_is_ref (origin))
14168 parameter->kind = CALL_SITE_PARAMETER_PARAM_OFFSET;
14170 sect_offset sect_off
14171 = (sect_offset) dwarf2_get_ref_die_offset (origin);
14172 if (!offset_in_cu_p (&cu->header, sect_off))
14174 /* As DW_OP_GNU_parameter_ref uses CU-relative offset this
14175 binding can be done only inside one CU. Such referenced DIE
14176 therefore cannot be even moved to DW_TAG_partial_unit. */
14177 complaint (_("DW_AT_call_parameter offset is not in CU for "
14178 "DW_TAG_call_site child DIE %s [in module %s]"),
14179 sect_offset_str (child_die->sect_off),
14180 objfile_name (objfile));
14183 parameter->u.param_cu_off
14184 = (cu_offset) (sect_off - cu->header.sect_off);
14186 else if (loc == NULL || origin != NULL || !attr_form_is_block (loc))
14188 complaint (_("No DW_FORM_block* DW_AT_location for "
14189 "DW_TAG_call_site child DIE %s [in module %s]"),
14190 sect_offset_str (child_die->sect_off), objfile_name (objfile));
14195 parameter->u.dwarf_reg = dwarf_block_to_dwarf_reg
14196 (DW_BLOCK (loc)->data, &DW_BLOCK (loc)->data[DW_BLOCK (loc)->size]);
14197 if (parameter->u.dwarf_reg != -1)
14198 parameter->kind = CALL_SITE_PARAMETER_DWARF_REG;
14199 else if (dwarf_block_to_sp_offset (gdbarch, DW_BLOCK (loc)->data,
14200 &DW_BLOCK (loc)->data[DW_BLOCK (loc)->size],
14201 ¶meter->u.fb_offset))
14202 parameter->kind = CALL_SITE_PARAMETER_FB_OFFSET;
14205 complaint (_("Only single DW_OP_reg or DW_OP_fbreg is supported "
14206 "for DW_FORM_block* DW_AT_location is supported for "
14207 "DW_TAG_call_site child DIE %s "
14209 sect_offset_str (child_die->sect_off),
14210 objfile_name (objfile));
14215 attr = dwarf2_attr (child_die, DW_AT_call_value, cu);
14217 attr = dwarf2_attr (child_die, DW_AT_GNU_call_site_value, cu);
14218 if (!attr_form_is_block (attr))
14220 complaint (_("No DW_FORM_block* DW_AT_call_value for "
14221 "DW_TAG_call_site child DIE %s [in module %s]"),
14222 sect_offset_str (child_die->sect_off),
14223 objfile_name (objfile));
14226 parameter->value = DW_BLOCK (attr)->data;
14227 parameter->value_size = DW_BLOCK (attr)->size;
14229 /* Parameters are not pre-cleared by memset above. */
14230 parameter->data_value = NULL;
14231 parameter->data_value_size = 0;
14232 call_site->parameter_count++;
14234 attr = dwarf2_attr (child_die, DW_AT_call_data_value, cu);
14236 attr = dwarf2_attr (child_die, DW_AT_GNU_call_site_data_value, cu);
14239 if (!attr_form_is_block (attr))
14240 complaint (_("No DW_FORM_block* DW_AT_call_data_value for "
14241 "DW_TAG_call_site child DIE %s [in module %s]"),
14242 sect_offset_str (child_die->sect_off),
14243 objfile_name (objfile));
14246 parameter->data_value = DW_BLOCK (attr)->data;
14247 parameter->data_value_size = DW_BLOCK (attr)->size;
14253 /* Helper function for read_variable. If DIE represents a virtual
14254 table, then return the type of the concrete object that is
14255 associated with the virtual table. Otherwise, return NULL. */
14257 static struct type *
14258 rust_containing_type (struct die_info *die, struct dwarf2_cu *cu)
14260 struct attribute *attr = dwarf2_attr (die, DW_AT_type, cu);
14264 /* Find the type DIE. */
14265 struct die_info *type_die = NULL;
14266 struct dwarf2_cu *type_cu = cu;
14268 if (attr_form_is_ref (attr))
14269 type_die = follow_die_ref (die, attr, &type_cu);
14270 if (type_die == NULL)
14273 if (dwarf2_attr (type_die, DW_AT_containing_type, type_cu) == NULL)
14275 return die_containing_type (type_die, type_cu);
14278 /* Read a variable (DW_TAG_variable) DIE and create a new symbol. */
14281 read_variable (struct die_info *die, struct dwarf2_cu *cu)
14283 struct rust_vtable_symbol *storage = NULL;
14285 if (cu->language == language_rust)
14287 struct type *containing_type = rust_containing_type (die, cu);
14289 if (containing_type != NULL)
14291 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
14293 storage = OBSTACK_ZALLOC (&objfile->objfile_obstack,
14294 struct rust_vtable_symbol);
14295 initialize_objfile_symbol (storage);
14296 storage->concrete_type = containing_type;
14297 storage->subclass = SYMBOL_RUST_VTABLE;
14301 struct symbol *res = new_symbol (die, NULL, cu, storage);
14302 struct attribute *abstract_origin
14303 = dwarf2_attr (die, DW_AT_abstract_origin, cu);
14304 struct attribute *loc = dwarf2_attr (die, DW_AT_location, cu);
14305 if (res == NULL && loc && abstract_origin)
14307 /* We have a variable without a name, but with a location and an abstract
14308 origin. This may be a concrete instance of an abstract variable
14309 referenced from an DW_OP_GNU_variable_value, so save it to find it back
14311 struct dwarf2_cu *origin_cu = cu;
14312 struct die_info *origin_die
14313 = follow_die_ref (die, abstract_origin, &origin_cu);
14314 dwarf2_per_objfile *dpo = cu->per_cu->dwarf2_per_objfile;
14315 dpo->abstract_to_concrete[origin_die].push_back (die);
14319 /* Call CALLBACK from DW_AT_ranges attribute value OFFSET
14320 reading .debug_rnglists.
14321 Callback's type should be:
14322 void (CORE_ADDR range_beginning, CORE_ADDR range_end)
14323 Return true if the attributes are present and valid, otherwise,
14326 template <typename Callback>
14328 dwarf2_rnglists_process (unsigned offset, struct dwarf2_cu *cu,
14329 Callback &&callback)
14331 struct dwarf2_per_objfile *dwarf2_per_objfile
14332 = cu->per_cu->dwarf2_per_objfile;
14333 struct objfile *objfile = dwarf2_per_objfile->objfile;
14334 bfd *obfd = objfile->obfd;
14335 /* Base address selection entry. */
14338 const gdb_byte *buffer;
14339 CORE_ADDR baseaddr;
14340 bool overflow = false;
14342 found_base = cu->base_known;
14343 base = cu->base_address;
14345 dwarf2_read_section (objfile, &dwarf2_per_objfile->rnglists);
14346 if (offset >= dwarf2_per_objfile->rnglists.size)
14348 complaint (_("Offset %d out of bounds for DW_AT_ranges attribute"),
14352 buffer = dwarf2_per_objfile->rnglists.buffer + offset;
14354 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
14358 /* Initialize it due to a false compiler warning. */
14359 CORE_ADDR range_beginning = 0, range_end = 0;
14360 const gdb_byte *buf_end = (dwarf2_per_objfile->rnglists.buffer
14361 + dwarf2_per_objfile->rnglists.size);
14362 unsigned int bytes_read;
14364 if (buffer == buf_end)
14369 const auto rlet = static_cast<enum dwarf_range_list_entry>(*buffer++);
14372 case DW_RLE_end_of_list:
14374 case DW_RLE_base_address:
14375 if (buffer + cu->header.addr_size > buf_end)
14380 base = read_address (obfd, buffer, cu, &bytes_read);
14382 buffer += bytes_read;
14384 case DW_RLE_start_length:
14385 if (buffer + cu->header.addr_size > buf_end)
14390 range_beginning = read_address (obfd, buffer, cu, &bytes_read);
14391 buffer += bytes_read;
14392 range_end = (range_beginning
14393 + read_unsigned_leb128 (obfd, buffer, &bytes_read));
14394 buffer += bytes_read;
14395 if (buffer > buf_end)
14401 case DW_RLE_offset_pair:
14402 range_beginning = read_unsigned_leb128 (obfd, buffer, &bytes_read);
14403 buffer += bytes_read;
14404 if (buffer > buf_end)
14409 range_end = read_unsigned_leb128 (obfd, buffer, &bytes_read);
14410 buffer += bytes_read;
14411 if (buffer > buf_end)
14417 case DW_RLE_start_end:
14418 if (buffer + 2 * cu->header.addr_size > buf_end)
14423 range_beginning = read_address (obfd, buffer, cu, &bytes_read);
14424 buffer += bytes_read;
14425 range_end = read_address (obfd, buffer, cu, &bytes_read);
14426 buffer += bytes_read;
14429 complaint (_("Invalid .debug_rnglists data (no base address)"));
14432 if (rlet == DW_RLE_end_of_list || overflow)
14434 if (rlet == DW_RLE_base_address)
14439 /* We have no valid base address for the ranges
14441 complaint (_("Invalid .debug_rnglists data (no base address)"));
14445 if (range_beginning > range_end)
14447 /* Inverted range entries are invalid. */
14448 complaint (_("Invalid .debug_rnglists data (inverted range)"));
14452 /* Empty range entries have no effect. */
14453 if (range_beginning == range_end)
14456 range_beginning += base;
14459 /* A not-uncommon case of bad debug info.
14460 Don't pollute the addrmap with bad data. */
14461 if (range_beginning + baseaddr == 0
14462 && !dwarf2_per_objfile->has_section_at_zero)
14464 complaint (_(".debug_rnglists entry has start address of zero"
14465 " [in module %s]"), objfile_name (objfile));
14469 callback (range_beginning, range_end);
14474 complaint (_("Offset %d is not terminated "
14475 "for DW_AT_ranges attribute"),
14483 /* Call CALLBACK from DW_AT_ranges attribute value OFFSET reading .debug_ranges.
14484 Callback's type should be:
14485 void (CORE_ADDR range_beginning, CORE_ADDR range_end)
14486 Return 1 if the attributes are present and valid, otherwise, return 0. */
14488 template <typename Callback>
14490 dwarf2_ranges_process (unsigned offset, struct dwarf2_cu *cu,
14491 Callback &&callback)
14493 struct dwarf2_per_objfile *dwarf2_per_objfile
14494 = cu->per_cu->dwarf2_per_objfile;
14495 struct objfile *objfile = dwarf2_per_objfile->objfile;
14496 struct comp_unit_head *cu_header = &cu->header;
14497 bfd *obfd = objfile->obfd;
14498 unsigned int addr_size = cu_header->addr_size;
14499 CORE_ADDR mask = ~(~(CORE_ADDR)1 << (addr_size * 8 - 1));
14500 /* Base address selection entry. */
14503 unsigned int dummy;
14504 const gdb_byte *buffer;
14505 CORE_ADDR baseaddr;
14507 if (cu_header->version >= 5)
14508 return dwarf2_rnglists_process (offset, cu, callback);
14510 found_base = cu->base_known;
14511 base = cu->base_address;
14513 dwarf2_read_section (objfile, &dwarf2_per_objfile->ranges);
14514 if (offset >= dwarf2_per_objfile->ranges.size)
14516 complaint (_("Offset %d out of bounds for DW_AT_ranges attribute"),
14520 buffer = dwarf2_per_objfile->ranges.buffer + offset;
14522 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
14526 CORE_ADDR range_beginning, range_end;
14528 range_beginning = read_address (obfd, buffer, cu, &dummy);
14529 buffer += addr_size;
14530 range_end = read_address (obfd, buffer, cu, &dummy);
14531 buffer += addr_size;
14532 offset += 2 * addr_size;
14534 /* An end of list marker is a pair of zero addresses. */
14535 if (range_beginning == 0 && range_end == 0)
14536 /* Found the end of list entry. */
14539 /* Each base address selection entry is a pair of 2 values.
14540 The first is the largest possible address, the second is
14541 the base address. Check for a base address here. */
14542 if ((range_beginning & mask) == mask)
14544 /* If we found the largest possible address, then we already
14545 have the base address in range_end. */
14553 /* We have no valid base address for the ranges
14555 complaint (_("Invalid .debug_ranges data (no base address)"));
14559 if (range_beginning > range_end)
14561 /* Inverted range entries are invalid. */
14562 complaint (_("Invalid .debug_ranges data (inverted range)"));
14566 /* Empty range entries have no effect. */
14567 if (range_beginning == range_end)
14570 range_beginning += base;
14573 /* A not-uncommon case of bad debug info.
14574 Don't pollute the addrmap with bad data. */
14575 if (range_beginning + baseaddr == 0
14576 && !dwarf2_per_objfile->has_section_at_zero)
14578 complaint (_(".debug_ranges entry has start address of zero"
14579 " [in module %s]"), objfile_name (objfile));
14583 callback (range_beginning, range_end);
14589 /* Get low and high pc attributes from DW_AT_ranges attribute value OFFSET.
14590 Return 1 if the attributes are present and valid, otherwise, return 0.
14591 If RANGES_PST is not NULL we should setup `objfile->psymtabs_addrmap'. */
14594 dwarf2_ranges_read (unsigned offset, CORE_ADDR *low_return,
14595 CORE_ADDR *high_return, struct dwarf2_cu *cu,
14596 struct partial_symtab *ranges_pst)
14598 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
14599 struct gdbarch *gdbarch = get_objfile_arch (objfile);
14600 const CORE_ADDR baseaddr = ANOFFSET (objfile->section_offsets,
14601 SECT_OFF_TEXT (objfile));
14604 CORE_ADDR high = 0;
14607 retval = dwarf2_ranges_process (offset, cu,
14608 [&] (CORE_ADDR range_beginning, CORE_ADDR range_end)
14610 if (ranges_pst != NULL)
14615 lowpc = (gdbarch_adjust_dwarf2_addr (gdbarch,
14616 range_beginning + baseaddr)
14618 highpc = (gdbarch_adjust_dwarf2_addr (gdbarch,
14619 range_end + baseaddr)
14621 addrmap_set_empty (objfile->partial_symtabs->psymtabs_addrmap,
14622 lowpc, highpc - 1, ranges_pst);
14625 /* FIXME: This is recording everything as a low-high
14626 segment of consecutive addresses. We should have a
14627 data structure for discontiguous block ranges
14631 low = range_beginning;
14637 if (range_beginning < low)
14638 low = range_beginning;
14639 if (range_end > high)
14647 /* If the first entry is an end-of-list marker, the range
14648 describes an empty scope, i.e. no instructions. */
14654 *high_return = high;
14658 /* Get low and high pc attributes from a die. See enum pc_bounds_kind
14659 definition for the return value. *LOWPC and *HIGHPC are set iff
14660 neither PC_BOUNDS_NOT_PRESENT nor PC_BOUNDS_INVALID are returned. */
14662 static enum pc_bounds_kind
14663 dwarf2_get_pc_bounds (struct die_info *die, CORE_ADDR *lowpc,
14664 CORE_ADDR *highpc, struct dwarf2_cu *cu,
14665 struct partial_symtab *pst)
14667 struct dwarf2_per_objfile *dwarf2_per_objfile
14668 = cu->per_cu->dwarf2_per_objfile;
14669 struct attribute *attr;
14670 struct attribute *attr_high;
14672 CORE_ADDR high = 0;
14673 enum pc_bounds_kind ret;
14675 attr_high = dwarf2_attr (die, DW_AT_high_pc, cu);
14678 attr = dwarf2_attr (die, DW_AT_low_pc, cu);
14681 low = attr_value_as_address (attr);
14682 high = attr_value_as_address (attr_high);
14683 if (cu->header.version >= 4 && attr_form_is_constant (attr_high))
14687 /* Found high w/o low attribute. */
14688 return PC_BOUNDS_INVALID;
14690 /* Found consecutive range of addresses. */
14691 ret = PC_BOUNDS_HIGH_LOW;
14695 attr = dwarf2_attr (die, DW_AT_ranges, cu);
14698 /* DW_AT_ranges_base does not apply to DIEs from the DWO skeleton.
14699 We take advantage of the fact that DW_AT_ranges does not appear
14700 in DW_TAG_compile_unit of DWO files. */
14701 int need_ranges_base = die->tag != DW_TAG_compile_unit;
14702 unsigned int ranges_offset = (DW_UNSND (attr)
14703 + (need_ranges_base
14707 /* Value of the DW_AT_ranges attribute is the offset in the
14708 .debug_ranges section. */
14709 if (!dwarf2_ranges_read (ranges_offset, &low, &high, cu, pst))
14710 return PC_BOUNDS_INVALID;
14711 /* Found discontinuous range of addresses. */
14712 ret = PC_BOUNDS_RANGES;
14715 return PC_BOUNDS_NOT_PRESENT;
14718 /* partial_die_info::read has also the strict LOW < HIGH requirement. */
14720 return PC_BOUNDS_INVALID;
14722 /* When using the GNU linker, .gnu.linkonce. sections are used to
14723 eliminate duplicate copies of functions and vtables and such.
14724 The linker will arbitrarily choose one and discard the others.
14725 The AT_*_pc values for such functions refer to local labels in
14726 these sections. If the section from that file was discarded, the
14727 labels are not in the output, so the relocs get a value of 0.
14728 If this is a discarded function, mark the pc bounds as invalid,
14729 so that GDB will ignore it. */
14730 if (low == 0 && !dwarf2_per_objfile->has_section_at_zero)
14731 return PC_BOUNDS_INVALID;
14739 /* Assuming that DIE represents a subprogram DIE or a lexical block, get
14740 its low and high PC addresses. Do nothing if these addresses could not
14741 be determined. Otherwise, set LOWPC to the low address if it is smaller,
14742 and HIGHPC to the high address if greater than HIGHPC. */
14745 dwarf2_get_subprogram_pc_bounds (struct die_info *die,
14746 CORE_ADDR *lowpc, CORE_ADDR *highpc,
14747 struct dwarf2_cu *cu)
14749 CORE_ADDR low, high;
14750 struct die_info *child = die->child;
14752 if (dwarf2_get_pc_bounds (die, &low, &high, cu, NULL) >= PC_BOUNDS_RANGES)
14754 *lowpc = std::min (*lowpc, low);
14755 *highpc = std::max (*highpc, high);
14758 /* If the language does not allow nested subprograms (either inside
14759 subprograms or lexical blocks), we're done. */
14760 if (cu->language != language_ada)
14763 /* Check all the children of the given DIE. If it contains nested
14764 subprograms, then check their pc bounds. Likewise, we need to
14765 check lexical blocks as well, as they may also contain subprogram
14767 while (child && child->tag)
14769 if (child->tag == DW_TAG_subprogram
14770 || child->tag == DW_TAG_lexical_block)
14771 dwarf2_get_subprogram_pc_bounds (child, lowpc, highpc, cu);
14772 child = sibling_die (child);
14776 /* Get the low and high pc's represented by the scope DIE, and store
14777 them in *LOWPC and *HIGHPC. If the correct values can't be
14778 determined, set *LOWPC to -1 and *HIGHPC to 0. */
14781 get_scope_pc_bounds (struct die_info *die,
14782 CORE_ADDR *lowpc, CORE_ADDR *highpc,
14783 struct dwarf2_cu *cu)
14785 CORE_ADDR best_low = (CORE_ADDR) -1;
14786 CORE_ADDR best_high = (CORE_ADDR) 0;
14787 CORE_ADDR current_low, current_high;
14789 if (dwarf2_get_pc_bounds (die, ¤t_low, ¤t_high, cu, NULL)
14790 >= PC_BOUNDS_RANGES)
14792 best_low = current_low;
14793 best_high = current_high;
14797 struct die_info *child = die->child;
14799 while (child && child->tag)
14801 switch (child->tag) {
14802 case DW_TAG_subprogram:
14803 dwarf2_get_subprogram_pc_bounds (child, &best_low, &best_high, cu);
14805 case DW_TAG_namespace:
14806 case DW_TAG_module:
14807 /* FIXME: carlton/2004-01-16: Should we do this for
14808 DW_TAG_class_type/DW_TAG_structure_type, too? I think
14809 that current GCC's always emit the DIEs corresponding
14810 to definitions of methods of classes as children of a
14811 DW_TAG_compile_unit or DW_TAG_namespace (as opposed to
14812 the DIEs giving the declarations, which could be
14813 anywhere). But I don't see any reason why the
14814 standards says that they have to be there. */
14815 get_scope_pc_bounds (child, ¤t_low, ¤t_high, cu);
14817 if (current_low != ((CORE_ADDR) -1))
14819 best_low = std::min (best_low, current_low);
14820 best_high = std::max (best_high, current_high);
14828 child = sibling_die (child);
14833 *highpc = best_high;
14836 /* Record the address ranges for BLOCK, offset by BASEADDR, as given
14840 dwarf2_record_block_ranges (struct die_info *die, struct block *block,
14841 CORE_ADDR baseaddr, struct dwarf2_cu *cu)
14843 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
14844 struct gdbarch *gdbarch = get_objfile_arch (objfile);
14845 struct attribute *attr;
14846 struct attribute *attr_high;
14848 attr_high = dwarf2_attr (die, DW_AT_high_pc, cu);
14851 attr = dwarf2_attr (die, DW_AT_low_pc, cu);
14854 CORE_ADDR low = attr_value_as_address (attr);
14855 CORE_ADDR high = attr_value_as_address (attr_high);
14857 if (cu->header.version >= 4 && attr_form_is_constant (attr_high))
14860 low = gdbarch_adjust_dwarf2_addr (gdbarch, low + baseaddr);
14861 high = gdbarch_adjust_dwarf2_addr (gdbarch, high + baseaddr);
14862 cu->get_builder ()->record_block_range (block, low, high - 1);
14866 attr = dwarf2_attr (die, DW_AT_ranges, cu);
14869 /* DW_AT_ranges_base does not apply to DIEs from the DWO skeleton.
14870 We take advantage of the fact that DW_AT_ranges does not appear
14871 in DW_TAG_compile_unit of DWO files. */
14872 int need_ranges_base = die->tag != DW_TAG_compile_unit;
14874 /* The value of the DW_AT_ranges attribute is the offset of the
14875 address range list in the .debug_ranges section. */
14876 unsigned long offset = (DW_UNSND (attr)
14877 + (need_ranges_base ? cu->ranges_base : 0));
14879 std::vector<blockrange> blockvec;
14880 dwarf2_ranges_process (offset, cu,
14881 [&] (CORE_ADDR start, CORE_ADDR end)
14885 start = gdbarch_adjust_dwarf2_addr (gdbarch, start);
14886 end = gdbarch_adjust_dwarf2_addr (gdbarch, end);
14887 cu->get_builder ()->record_block_range (block, start, end - 1);
14888 blockvec.emplace_back (start, end);
14891 BLOCK_RANGES(block) = make_blockranges (objfile, blockvec);
14895 /* Check whether the producer field indicates either of GCC < 4.6, or the
14896 Intel C/C++ compiler, and cache the result in CU. */
14899 check_producer (struct dwarf2_cu *cu)
14903 if (cu->producer == NULL)
14905 /* For unknown compilers expect their behavior is DWARF version
14908 GCC started to support .debug_types sections by -gdwarf-4 since
14909 gcc-4.5.x. As the .debug_types sections are missing DW_AT_producer
14910 for their space efficiency GDB cannot workaround gcc-4.5.x -gdwarf-4
14911 combination. gcc-4.5.x -gdwarf-4 binaries have DW_AT_accessibility
14912 interpreted incorrectly by GDB now - GCC PR debug/48229. */
14914 else if (producer_is_gcc (cu->producer, &major, &minor))
14916 cu->producer_is_gxx_lt_4_6 = major < 4 || (major == 4 && minor < 6);
14917 cu->producer_is_gcc_lt_4_3 = major < 4 || (major == 4 && minor < 3);
14919 else if (producer_is_icc (cu->producer, &major, &minor))
14921 cu->producer_is_icc = true;
14922 cu->producer_is_icc_lt_14 = major < 14;
14924 else if (startswith (cu->producer, "CodeWarrior S12/L-ISA"))
14925 cu->producer_is_codewarrior = true;
14928 /* For other non-GCC compilers, expect their behavior is DWARF version
14932 cu->checked_producer = true;
14935 /* Check for GCC PR debug/45124 fix which is not present in any G++ version up
14936 to 4.5.any while it is present already in G++ 4.6.0 - the PR has been fixed
14937 during 4.6.0 experimental. */
14940 producer_is_gxx_lt_4_6 (struct dwarf2_cu *cu)
14942 if (!cu->checked_producer)
14943 check_producer (cu);
14945 return cu->producer_is_gxx_lt_4_6;
14949 /* Codewarrior (at least as of version 5.0.40) generates dwarf line information
14950 with incorrect is_stmt attributes. */
14953 producer_is_codewarrior (struct dwarf2_cu *cu)
14955 if (!cu->checked_producer)
14956 check_producer (cu);
14958 return cu->producer_is_codewarrior;
14961 /* Return the default accessibility type if it is not overriden by
14962 DW_AT_accessibility. */
14964 static enum dwarf_access_attribute
14965 dwarf2_default_access_attribute (struct die_info *die, struct dwarf2_cu *cu)
14967 if (cu->header.version < 3 || producer_is_gxx_lt_4_6 (cu))
14969 /* The default DWARF 2 accessibility for members is public, the default
14970 accessibility for inheritance is private. */
14972 if (die->tag != DW_TAG_inheritance)
14973 return DW_ACCESS_public;
14975 return DW_ACCESS_private;
14979 /* DWARF 3+ defines the default accessibility a different way. The same
14980 rules apply now for DW_TAG_inheritance as for the members and it only
14981 depends on the container kind. */
14983 if (die->parent->tag == DW_TAG_class_type)
14984 return DW_ACCESS_private;
14986 return DW_ACCESS_public;
14990 /* Look for DW_AT_data_member_location. Set *OFFSET to the byte
14991 offset. If the attribute was not found return 0, otherwise return
14992 1. If it was found but could not properly be handled, set *OFFSET
14996 handle_data_member_location (struct die_info *die, struct dwarf2_cu *cu,
14999 struct attribute *attr;
15001 attr = dwarf2_attr (die, DW_AT_data_member_location, cu);
15006 /* Note that we do not check for a section offset first here.
15007 This is because DW_AT_data_member_location is new in DWARF 4,
15008 so if we see it, we can assume that a constant form is really
15009 a constant and not a section offset. */
15010 if (attr_form_is_constant (attr))
15011 *offset = dwarf2_get_attr_constant_value (attr, 0);
15012 else if (attr_form_is_section_offset (attr))
15013 dwarf2_complex_location_expr_complaint ();
15014 else if (attr_form_is_block (attr))
15015 *offset = decode_locdesc (DW_BLOCK (attr), cu);
15017 dwarf2_complex_location_expr_complaint ();
15025 /* Add an aggregate field to the field list. */
15028 dwarf2_add_field (struct field_info *fip, struct die_info *die,
15029 struct dwarf2_cu *cu)
15031 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
15032 struct gdbarch *gdbarch = get_objfile_arch (objfile);
15033 struct nextfield *new_field;
15034 struct attribute *attr;
15036 const char *fieldname = "";
15038 if (die->tag == DW_TAG_inheritance)
15040 fip->baseclasses.emplace_back ();
15041 new_field = &fip->baseclasses.back ();
15045 fip->fields.emplace_back ();
15046 new_field = &fip->fields.back ();
15051 attr = dwarf2_attr (die, DW_AT_accessibility, cu);
15053 new_field->accessibility = DW_UNSND (attr);
15055 new_field->accessibility = dwarf2_default_access_attribute (die, cu);
15056 if (new_field->accessibility != DW_ACCESS_public)
15057 fip->non_public_fields = 1;
15059 attr = dwarf2_attr (die, DW_AT_virtuality, cu);
15061 new_field->virtuality = DW_UNSND (attr);
15063 new_field->virtuality = DW_VIRTUALITY_none;
15065 fp = &new_field->field;
15067 if (die->tag == DW_TAG_member && ! die_is_declaration (die, cu))
15071 /* Data member other than a C++ static data member. */
15073 /* Get type of field. */
15074 fp->type = die_type (die, cu);
15076 SET_FIELD_BITPOS (*fp, 0);
15078 /* Get bit size of field (zero if none). */
15079 attr = dwarf2_attr (die, DW_AT_bit_size, cu);
15082 FIELD_BITSIZE (*fp) = DW_UNSND (attr);
15086 FIELD_BITSIZE (*fp) = 0;
15089 /* Get bit offset of field. */
15090 if (handle_data_member_location (die, cu, &offset))
15091 SET_FIELD_BITPOS (*fp, offset * bits_per_byte);
15092 attr = dwarf2_attr (die, DW_AT_bit_offset, cu);
15095 if (gdbarch_bits_big_endian (gdbarch))
15097 /* For big endian bits, the DW_AT_bit_offset gives the
15098 additional bit offset from the MSB of the containing
15099 anonymous object to the MSB of the field. We don't
15100 have to do anything special since we don't need to
15101 know the size of the anonymous object. */
15102 SET_FIELD_BITPOS (*fp, FIELD_BITPOS (*fp) + DW_UNSND (attr));
15106 /* For little endian bits, compute the bit offset to the
15107 MSB of the anonymous object, subtract off the number of
15108 bits from the MSB of the field to the MSB of the
15109 object, and then subtract off the number of bits of
15110 the field itself. The result is the bit offset of
15111 the LSB of the field. */
15112 int anonymous_size;
15113 int bit_offset = DW_UNSND (attr);
15115 attr = dwarf2_attr (die, DW_AT_byte_size, cu);
15118 /* The size of the anonymous object containing
15119 the bit field is explicit, so use the
15120 indicated size (in bytes). */
15121 anonymous_size = DW_UNSND (attr);
15125 /* The size of the anonymous object containing
15126 the bit field must be inferred from the type
15127 attribute of the data member containing the
15129 anonymous_size = TYPE_LENGTH (fp->type);
15131 SET_FIELD_BITPOS (*fp,
15132 (FIELD_BITPOS (*fp)
15133 + anonymous_size * bits_per_byte
15134 - bit_offset - FIELD_BITSIZE (*fp)));
15137 attr = dwarf2_attr (die, DW_AT_data_bit_offset, cu);
15139 SET_FIELD_BITPOS (*fp, (FIELD_BITPOS (*fp)
15140 + dwarf2_get_attr_constant_value (attr, 0)));
15142 /* Get name of field. */
15143 fieldname = dwarf2_name (die, cu);
15144 if (fieldname == NULL)
15147 /* The name is already allocated along with this objfile, so we don't
15148 need to duplicate it for the type. */
15149 fp->name = fieldname;
15151 /* Change accessibility for artificial fields (e.g. virtual table
15152 pointer or virtual base class pointer) to private. */
15153 if (dwarf2_attr (die, DW_AT_artificial, cu))
15155 FIELD_ARTIFICIAL (*fp) = 1;
15156 new_field->accessibility = DW_ACCESS_private;
15157 fip->non_public_fields = 1;
15160 else if (die->tag == DW_TAG_member || die->tag == DW_TAG_variable)
15162 /* C++ static member. */
15164 /* NOTE: carlton/2002-11-05: It should be a DW_TAG_member that
15165 is a declaration, but all versions of G++ as of this writing
15166 (so through at least 3.2.1) incorrectly generate
15167 DW_TAG_variable tags. */
15169 const char *physname;
15171 /* Get name of field. */
15172 fieldname = dwarf2_name (die, cu);
15173 if (fieldname == NULL)
15176 attr = dwarf2_attr (die, DW_AT_const_value, cu);
15178 /* Only create a symbol if this is an external value.
15179 new_symbol checks this and puts the value in the global symbol
15180 table, which we want. If it is not external, new_symbol
15181 will try to put the value in cu->list_in_scope which is wrong. */
15182 && dwarf2_flag_true_p (die, DW_AT_external, cu))
15184 /* A static const member, not much different than an enum as far as
15185 we're concerned, except that we can support more types. */
15186 new_symbol (die, NULL, cu);
15189 /* Get physical name. */
15190 physname = dwarf2_physname (fieldname, die, cu);
15192 /* The name is already allocated along with this objfile, so we don't
15193 need to duplicate it for the type. */
15194 SET_FIELD_PHYSNAME (*fp, physname ? physname : "");
15195 FIELD_TYPE (*fp) = die_type (die, cu);
15196 FIELD_NAME (*fp) = fieldname;
15198 else if (die->tag == DW_TAG_inheritance)
15202 /* C++ base class field. */
15203 if (handle_data_member_location (die, cu, &offset))
15204 SET_FIELD_BITPOS (*fp, offset * bits_per_byte);
15205 FIELD_BITSIZE (*fp) = 0;
15206 FIELD_TYPE (*fp) = die_type (die, cu);
15207 FIELD_NAME (*fp) = TYPE_NAME (fp->type);
15209 else if (die->tag == DW_TAG_variant_part)
15211 /* process_structure_scope will treat this DIE as a union. */
15212 process_structure_scope (die, cu);
15214 /* The variant part is relative to the start of the enclosing
15216 SET_FIELD_BITPOS (*fp, 0);
15217 fp->type = get_die_type (die, cu);
15218 fp->artificial = 1;
15219 fp->name = "<<variant>>";
15221 /* Normally a DW_TAG_variant_part won't have a size, but our
15222 representation requires one, so set it to the maximum of the
15224 if (TYPE_LENGTH (fp->type) == 0)
15227 for (int i = 0; i < TYPE_NFIELDS (fp->type); ++i)
15228 if (TYPE_LENGTH (TYPE_FIELD_TYPE (fp->type, i)) > max)
15229 max = TYPE_LENGTH (TYPE_FIELD_TYPE (fp->type, i));
15230 TYPE_LENGTH (fp->type) = max;
15234 gdb_assert_not_reached ("missing case in dwarf2_add_field");
15237 /* Can the type given by DIE define another type? */
15240 type_can_define_types (const struct die_info *die)
15244 case DW_TAG_typedef:
15245 case DW_TAG_class_type:
15246 case DW_TAG_structure_type:
15247 case DW_TAG_union_type:
15248 case DW_TAG_enumeration_type:
15256 /* Add a type definition defined in the scope of the FIP's class. */
15259 dwarf2_add_type_defn (struct field_info *fip, struct die_info *die,
15260 struct dwarf2_cu *cu)
15262 struct decl_field fp;
15263 memset (&fp, 0, sizeof (fp));
15265 gdb_assert (type_can_define_types (die));
15267 /* Get name of field. NULL is okay here, meaning an anonymous type. */
15268 fp.name = dwarf2_name (die, cu);
15269 fp.type = read_type_die (die, cu);
15271 /* Save accessibility. */
15272 enum dwarf_access_attribute accessibility;
15273 struct attribute *attr = dwarf2_attr (die, DW_AT_accessibility, cu);
15275 accessibility = (enum dwarf_access_attribute) DW_UNSND (attr);
15277 accessibility = dwarf2_default_access_attribute (die, cu);
15278 switch (accessibility)
15280 case DW_ACCESS_public:
15281 /* The assumed value if neither private nor protected. */
15283 case DW_ACCESS_private:
15286 case DW_ACCESS_protected:
15287 fp.is_protected = 1;
15290 complaint (_("Unhandled DW_AT_accessibility value (%x)"), accessibility);
15293 if (die->tag == DW_TAG_typedef)
15294 fip->typedef_field_list.push_back (fp);
15296 fip->nested_types_list.push_back (fp);
15299 /* Create the vector of fields, and attach it to the type. */
15302 dwarf2_attach_fields_to_type (struct field_info *fip, struct type *type,
15303 struct dwarf2_cu *cu)
15305 int nfields = fip->nfields;
15307 /* Record the field count, allocate space for the array of fields,
15308 and create blank accessibility bitfields if necessary. */
15309 TYPE_NFIELDS (type) = nfields;
15310 TYPE_FIELDS (type) = (struct field *)
15311 TYPE_ZALLOC (type, sizeof (struct field) * nfields);
15313 if (fip->non_public_fields && cu->language != language_ada)
15315 ALLOCATE_CPLUS_STRUCT_TYPE (type);
15317 TYPE_FIELD_PRIVATE_BITS (type) =
15318 (B_TYPE *) TYPE_ALLOC (type, B_BYTES (nfields));
15319 B_CLRALL (TYPE_FIELD_PRIVATE_BITS (type), nfields);
15321 TYPE_FIELD_PROTECTED_BITS (type) =
15322 (B_TYPE *) TYPE_ALLOC (type, B_BYTES (nfields));
15323 B_CLRALL (TYPE_FIELD_PROTECTED_BITS (type), nfields);
15325 TYPE_FIELD_IGNORE_BITS (type) =
15326 (B_TYPE *) TYPE_ALLOC (type, B_BYTES (nfields));
15327 B_CLRALL (TYPE_FIELD_IGNORE_BITS (type), nfields);
15330 /* If the type has baseclasses, allocate and clear a bit vector for
15331 TYPE_FIELD_VIRTUAL_BITS. */
15332 if (!fip->baseclasses.empty () && cu->language != language_ada)
15334 int num_bytes = B_BYTES (fip->baseclasses.size ());
15335 unsigned char *pointer;
15337 ALLOCATE_CPLUS_STRUCT_TYPE (type);
15338 pointer = (unsigned char *) TYPE_ALLOC (type, num_bytes);
15339 TYPE_FIELD_VIRTUAL_BITS (type) = pointer;
15340 B_CLRALL (TYPE_FIELD_VIRTUAL_BITS (type), fip->baseclasses.size ());
15341 TYPE_N_BASECLASSES (type) = fip->baseclasses.size ();
15344 if (TYPE_FLAG_DISCRIMINATED_UNION (type))
15346 struct discriminant_info *di = alloc_discriminant_info (type, -1, -1);
15348 for (int index = 0; index < nfields; ++index)
15350 struct nextfield &field = fip->fields[index];
15352 if (field.variant.is_discriminant)
15353 di->discriminant_index = index;
15354 else if (field.variant.default_branch)
15355 di->default_index = index;
15357 di->discriminants[index] = field.variant.discriminant_value;
15361 /* Copy the saved-up fields into the field vector. */
15362 for (int i = 0; i < nfields; ++i)
15364 struct nextfield &field
15365 = ((i < fip->baseclasses.size ()) ? fip->baseclasses[i]
15366 : fip->fields[i - fip->baseclasses.size ()]);
15368 TYPE_FIELD (type, i) = field.field;
15369 switch (field.accessibility)
15371 case DW_ACCESS_private:
15372 if (cu->language != language_ada)
15373 SET_TYPE_FIELD_PRIVATE (type, i);
15376 case DW_ACCESS_protected:
15377 if (cu->language != language_ada)
15378 SET_TYPE_FIELD_PROTECTED (type, i);
15381 case DW_ACCESS_public:
15385 /* Unknown accessibility. Complain and treat it as public. */
15387 complaint (_("unsupported accessibility %d"),
15388 field.accessibility);
15392 if (i < fip->baseclasses.size ())
15394 switch (field.virtuality)
15396 case DW_VIRTUALITY_virtual:
15397 case DW_VIRTUALITY_pure_virtual:
15398 if (cu->language == language_ada)
15399 error (_("unexpected virtuality in component of Ada type"));
15400 SET_TYPE_FIELD_VIRTUAL (type, i);
15407 /* Return true if this member function is a constructor, false
15411 dwarf2_is_constructor (struct die_info *die, struct dwarf2_cu *cu)
15413 const char *fieldname;
15414 const char *type_name;
15417 if (die->parent == NULL)
15420 if (die->parent->tag != DW_TAG_structure_type
15421 && die->parent->tag != DW_TAG_union_type
15422 && die->parent->tag != DW_TAG_class_type)
15425 fieldname = dwarf2_name (die, cu);
15426 type_name = dwarf2_name (die->parent, cu);
15427 if (fieldname == NULL || type_name == NULL)
15430 len = strlen (fieldname);
15431 return (strncmp (fieldname, type_name, len) == 0
15432 && (type_name[len] == '\0' || type_name[len] == '<'));
15435 /* Add a member function to the proper fieldlist. */
15438 dwarf2_add_member_fn (struct field_info *fip, struct die_info *die,
15439 struct type *type, struct dwarf2_cu *cu)
15441 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
15442 struct attribute *attr;
15444 struct fnfieldlist *flp = nullptr;
15445 struct fn_field *fnp;
15446 const char *fieldname;
15447 struct type *this_type;
15448 enum dwarf_access_attribute accessibility;
15450 if (cu->language == language_ada)
15451 error (_("unexpected member function in Ada type"));
15453 /* Get name of member function. */
15454 fieldname = dwarf2_name (die, cu);
15455 if (fieldname == NULL)
15458 /* Look up member function name in fieldlist. */
15459 for (i = 0; i < fip->fnfieldlists.size (); i++)
15461 if (strcmp (fip->fnfieldlists[i].name, fieldname) == 0)
15463 flp = &fip->fnfieldlists[i];
15468 /* Create a new fnfieldlist if necessary. */
15469 if (flp == nullptr)
15471 fip->fnfieldlists.emplace_back ();
15472 flp = &fip->fnfieldlists.back ();
15473 flp->name = fieldname;
15474 i = fip->fnfieldlists.size () - 1;
15477 /* Create a new member function field and add it to the vector of
15479 flp->fnfields.emplace_back ();
15480 fnp = &flp->fnfields.back ();
15482 /* Delay processing of the physname until later. */
15483 if (cu->language == language_cplus)
15484 add_to_method_list (type, i, flp->fnfields.size () - 1, fieldname,
15488 const char *physname = dwarf2_physname (fieldname, die, cu);
15489 fnp->physname = physname ? physname : "";
15492 fnp->type = alloc_type (objfile);
15493 this_type = read_type_die (die, cu);
15494 if (this_type && TYPE_CODE (this_type) == TYPE_CODE_FUNC)
15496 int nparams = TYPE_NFIELDS (this_type);
15498 /* TYPE is the domain of this method, and THIS_TYPE is the type
15499 of the method itself (TYPE_CODE_METHOD). */
15500 smash_to_method_type (fnp->type, type,
15501 TYPE_TARGET_TYPE (this_type),
15502 TYPE_FIELDS (this_type),
15503 TYPE_NFIELDS (this_type),
15504 TYPE_VARARGS (this_type));
15506 /* Handle static member functions.
15507 Dwarf2 has no clean way to discern C++ static and non-static
15508 member functions. G++ helps GDB by marking the first
15509 parameter for non-static member functions (which is the this
15510 pointer) as artificial. We obtain this information from
15511 read_subroutine_type via TYPE_FIELD_ARTIFICIAL. */
15512 if (nparams == 0 || TYPE_FIELD_ARTIFICIAL (this_type, 0) == 0)
15513 fnp->voffset = VOFFSET_STATIC;
15516 complaint (_("member function type missing for '%s'"),
15517 dwarf2_full_name (fieldname, die, cu));
15519 /* Get fcontext from DW_AT_containing_type if present. */
15520 if (dwarf2_attr (die, DW_AT_containing_type, cu) != NULL)
15521 fnp->fcontext = die_containing_type (die, cu);
15523 /* dwarf2 doesn't have stubbed physical names, so the setting of is_const and
15524 is_volatile is irrelevant, as it is needed by gdb_mangle_name only. */
15526 /* Get accessibility. */
15527 attr = dwarf2_attr (die, DW_AT_accessibility, cu);
15529 accessibility = (enum dwarf_access_attribute) DW_UNSND (attr);
15531 accessibility = dwarf2_default_access_attribute (die, cu);
15532 switch (accessibility)
15534 case DW_ACCESS_private:
15535 fnp->is_private = 1;
15537 case DW_ACCESS_protected:
15538 fnp->is_protected = 1;
15542 /* Check for artificial methods. */
15543 attr = dwarf2_attr (die, DW_AT_artificial, cu);
15544 if (attr && DW_UNSND (attr) != 0)
15545 fnp->is_artificial = 1;
15547 fnp->is_constructor = dwarf2_is_constructor (die, cu);
15549 /* Get index in virtual function table if it is a virtual member
15550 function. For older versions of GCC, this is an offset in the
15551 appropriate virtual table, as specified by DW_AT_containing_type.
15552 For everyone else, it is an expression to be evaluated relative
15553 to the object address. */
15555 attr = dwarf2_attr (die, DW_AT_vtable_elem_location, cu);
15558 if (attr_form_is_block (attr) && DW_BLOCK (attr)->size > 0)
15560 if (DW_BLOCK (attr)->data[0] == DW_OP_constu)
15562 /* Old-style GCC. */
15563 fnp->voffset = decode_locdesc (DW_BLOCK (attr), cu) + 2;
15565 else if (DW_BLOCK (attr)->data[0] == DW_OP_deref
15566 || (DW_BLOCK (attr)->size > 1
15567 && DW_BLOCK (attr)->data[0] == DW_OP_deref_size
15568 && DW_BLOCK (attr)->data[1] == cu->header.addr_size))
15570 fnp->voffset = decode_locdesc (DW_BLOCK (attr), cu);
15571 if ((fnp->voffset % cu->header.addr_size) != 0)
15572 dwarf2_complex_location_expr_complaint ();
15574 fnp->voffset /= cu->header.addr_size;
15578 dwarf2_complex_location_expr_complaint ();
15580 if (!fnp->fcontext)
15582 /* If there is no `this' field and no DW_AT_containing_type,
15583 we cannot actually find a base class context for the
15585 if (TYPE_NFIELDS (this_type) == 0
15586 || !TYPE_FIELD_ARTIFICIAL (this_type, 0))
15588 complaint (_("cannot determine context for virtual member "
15589 "function \"%s\" (offset %s)"),
15590 fieldname, sect_offset_str (die->sect_off));
15595 = TYPE_TARGET_TYPE (TYPE_FIELD_TYPE (this_type, 0));
15599 else if (attr_form_is_section_offset (attr))
15601 dwarf2_complex_location_expr_complaint ();
15605 dwarf2_invalid_attrib_class_complaint ("DW_AT_vtable_elem_location",
15611 attr = dwarf2_attr (die, DW_AT_virtuality, cu);
15612 if (attr && DW_UNSND (attr))
15614 /* GCC does this, as of 2008-08-25; PR debug/37237. */
15615 complaint (_("Member function \"%s\" (offset %s) is virtual "
15616 "but the vtable offset is not specified"),
15617 fieldname, sect_offset_str (die->sect_off));
15618 ALLOCATE_CPLUS_STRUCT_TYPE (type);
15619 TYPE_CPLUS_DYNAMIC (type) = 1;
15624 /* Create the vector of member function fields, and attach it to the type. */
15627 dwarf2_attach_fn_fields_to_type (struct field_info *fip, struct type *type,
15628 struct dwarf2_cu *cu)
15630 if (cu->language == language_ada)
15631 error (_("unexpected member functions in Ada type"));
15633 ALLOCATE_CPLUS_STRUCT_TYPE (type);
15634 TYPE_FN_FIELDLISTS (type) = (struct fn_fieldlist *)
15636 sizeof (struct fn_fieldlist) * fip->fnfieldlists.size ());
15638 for (int i = 0; i < fip->fnfieldlists.size (); i++)
15640 struct fnfieldlist &nf = fip->fnfieldlists[i];
15641 struct fn_fieldlist *fn_flp = &TYPE_FN_FIELDLIST (type, i);
15643 TYPE_FN_FIELDLIST_NAME (type, i) = nf.name;
15644 TYPE_FN_FIELDLIST_LENGTH (type, i) = nf.fnfields.size ();
15645 fn_flp->fn_fields = (struct fn_field *)
15646 TYPE_ALLOC (type, sizeof (struct fn_field) * nf.fnfields.size ());
15648 for (int k = 0; k < nf.fnfields.size (); ++k)
15649 fn_flp->fn_fields[k] = nf.fnfields[k];
15652 TYPE_NFN_FIELDS (type) = fip->fnfieldlists.size ();
15655 /* Returns non-zero if NAME is the name of a vtable member in CU's
15656 language, zero otherwise. */
15658 is_vtable_name (const char *name, struct dwarf2_cu *cu)
15660 static const char vptr[] = "_vptr";
15662 /* Look for the C++ form of the vtable. */
15663 if (startswith (name, vptr) && is_cplus_marker (name[sizeof (vptr) - 1]))
15669 /* GCC outputs unnamed structures that are really pointers to member
15670 functions, with the ABI-specified layout. If TYPE describes
15671 such a structure, smash it into a member function type.
15673 GCC shouldn't do this; it should just output pointer to member DIEs.
15674 This is GCC PR debug/28767. */
15677 quirk_gcc_member_function_pointer (struct type *type, struct objfile *objfile)
15679 struct type *pfn_type, *self_type, *new_type;
15681 /* Check for a structure with no name and two children. */
15682 if (TYPE_CODE (type) != TYPE_CODE_STRUCT || TYPE_NFIELDS (type) != 2)
15685 /* Check for __pfn and __delta members. */
15686 if (TYPE_FIELD_NAME (type, 0) == NULL
15687 || strcmp (TYPE_FIELD_NAME (type, 0), "__pfn") != 0
15688 || TYPE_FIELD_NAME (type, 1) == NULL
15689 || strcmp (TYPE_FIELD_NAME (type, 1), "__delta") != 0)
15692 /* Find the type of the method. */
15693 pfn_type = TYPE_FIELD_TYPE (type, 0);
15694 if (pfn_type == NULL
15695 || TYPE_CODE (pfn_type) != TYPE_CODE_PTR
15696 || TYPE_CODE (TYPE_TARGET_TYPE (pfn_type)) != TYPE_CODE_FUNC)
15699 /* Look for the "this" argument. */
15700 pfn_type = TYPE_TARGET_TYPE (pfn_type);
15701 if (TYPE_NFIELDS (pfn_type) == 0
15702 /* || TYPE_FIELD_TYPE (pfn_type, 0) == NULL */
15703 || TYPE_CODE (TYPE_FIELD_TYPE (pfn_type, 0)) != TYPE_CODE_PTR)
15706 self_type = TYPE_TARGET_TYPE (TYPE_FIELD_TYPE (pfn_type, 0));
15707 new_type = alloc_type (objfile);
15708 smash_to_method_type (new_type, self_type, TYPE_TARGET_TYPE (pfn_type),
15709 TYPE_FIELDS (pfn_type), TYPE_NFIELDS (pfn_type),
15710 TYPE_VARARGS (pfn_type));
15711 smash_to_methodptr_type (type, new_type);
15714 /* If the DIE has a DW_AT_alignment attribute, return its value, doing
15715 appropriate error checking and issuing complaints if there is a
15719 get_alignment (struct dwarf2_cu *cu, struct die_info *die)
15721 struct attribute *attr = dwarf2_attr (die, DW_AT_alignment, cu);
15723 if (attr == nullptr)
15726 if (!attr_form_is_constant (attr))
15728 complaint (_("DW_AT_alignment must have constant form"
15729 " - DIE at %s [in module %s]"),
15730 sect_offset_str (die->sect_off),
15731 objfile_name (cu->per_cu->dwarf2_per_objfile->objfile));
15736 if (attr->form == DW_FORM_sdata)
15738 LONGEST val = DW_SND (attr);
15741 complaint (_("DW_AT_alignment value must not be negative"
15742 " - DIE at %s [in module %s]"),
15743 sect_offset_str (die->sect_off),
15744 objfile_name (cu->per_cu->dwarf2_per_objfile->objfile));
15750 align = DW_UNSND (attr);
15754 complaint (_("DW_AT_alignment value must not be zero"
15755 " - DIE at %s [in module %s]"),
15756 sect_offset_str (die->sect_off),
15757 objfile_name (cu->per_cu->dwarf2_per_objfile->objfile));
15760 if ((align & (align - 1)) != 0)
15762 complaint (_("DW_AT_alignment value must be a power of 2"
15763 " - DIE at %s [in module %s]"),
15764 sect_offset_str (die->sect_off),
15765 objfile_name (cu->per_cu->dwarf2_per_objfile->objfile));
15772 /* If the DIE has a DW_AT_alignment attribute, use its value to set
15773 the alignment for TYPE. */
15776 maybe_set_alignment (struct dwarf2_cu *cu, struct die_info *die,
15779 if (!set_type_align (type, get_alignment (cu, die)))
15780 complaint (_("DW_AT_alignment value too large"
15781 " - DIE at %s [in module %s]"),
15782 sect_offset_str (die->sect_off),
15783 objfile_name (cu->per_cu->dwarf2_per_objfile->objfile));
15786 /* Called when we find the DIE that starts a structure or union scope
15787 (definition) to create a type for the structure or union. Fill in
15788 the type's name and general properties; the members will not be
15789 processed until process_structure_scope. A symbol table entry for
15790 the type will also not be done until process_structure_scope (assuming
15791 the type has a name).
15793 NOTE: we need to call these functions regardless of whether or not the
15794 DIE has a DW_AT_name attribute, since it might be an anonymous
15795 structure or union. This gets the type entered into our set of
15796 user defined types. */
15798 static struct type *
15799 read_structure_type (struct die_info *die, struct dwarf2_cu *cu)
15801 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
15803 struct attribute *attr;
15806 /* If the definition of this type lives in .debug_types, read that type.
15807 Don't follow DW_AT_specification though, that will take us back up
15808 the chain and we want to go down. */
15809 attr = dwarf2_attr_no_follow (die, DW_AT_signature);
15812 type = get_DW_AT_signature_type (die, attr, cu);
15814 /* The type's CU may not be the same as CU.
15815 Ensure TYPE is recorded with CU in die_type_hash. */
15816 return set_die_type (die, type, cu);
15819 type = alloc_type (objfile);
15820 INIT_CPLUS_SPECIFIC (type);
15822 name = dwarf2_name (die, cu);
15825 if (cu->language == language_cplus
15826 || cu->language == language_d
15827 || cu->language == language_rust)
15829 const char *full_name = dwarf2_full_name (name, die, cu);
15831 /* dwarf2_full_name might have already finished building the DIE's
15832 type. If so, there is no need to continue. */
15833 if (get_die_type (die, cu) != NULL)
15834 return get_die_type (die, cu);
15836 TYPE_NAME (type) = full_name;
15840 /* The name is already allocated along with this objfile, so
15841 we don't need to duplicate it for the type. */
15842 TYPE_NAME (type) = name;
15846 if (die->tag == DW_TAG_structure_type)
15848 TYPE_CODE (type) = TYPE_CODE_STRUCT;
15850 else if (die->tag == DW_TAG_union_type)
15852 TYPE_CODE (type) = TYPE_CODE_UNION;
15854 else if (die->tag == DW_TAG_variant_part)
15856 TYPE_CODE (type) = TYPE_CODE_UNION;
15857 TYPE_FLAG_DISCRIMINATED_UNION (type) = 1;
15861 TYPE_CODE (type) = TYPE_CODE_STRUCT;
15864 if (cu->language == language_cplus && die->tag == DW_TAG_class_type)
15865 TYPE_DECLARED_CLASS (type) = 1;
15867 attr = dwarf2_attr (die, DW_AT_byte_size, cu);
15870 if (attr_form_is_constant (attr))
15871 TYPE_LENGTH (type) = DW_UNSND (attr);
15874 /* For the moment, dynamic type sizes are not supported
15875 by GDB's struct type. The actual size is determined
15876 on-demand when resolving the type of a given object,
15877 so set the type's length to zero for now. Otherwise,
15878 we record an expression as the length, and that expression
15879 could lead to a very large value, which could eventually
15880 lead to us trying to allocate that much memory when creating
15881 a value of that type. */
15882 TYPE_LENGTH (type) = 0;
15887 TYPE_LENGTH (type) = 0;
15890 maybe_set_alignment (cu, die, type);
15892 if (producer_is_icc_lt_14 (cu) && (TYPE_LENGTH (type) == 0))
15894 /* ICC<14 does not output the required DW_AT_declaration on
15895 incomplete types, but gives them a size of zero. */
15896 TYPE_STUB (type) = 1;
15899 TYPE_STUB_SUPPORTED (type) = 1;
15901 if (die_is_declaration (die, cu))
15902 TYPE_STUB (type) = 1;
15903 else if (attr == NULL && die->child == NULL
15904 && producer_is_realview (cu->producer))
15905 /* RealView does not output the required DW_AT_declaration
15906 on incomplete types. */
15907 TYPE_STUB (type) = 1;
15909 /* We need to add the type field to the die immediately so we don't
15910 infinitely recurse when dealing with pointers to the structure
15911 type within the structure itself. */
15912 set_die_type (die, type, cu);
15914 /* set_die_type should be already done. */
15915 set_descriptive_type (type, die, cu);
15920 /* A helper for process_structure_scope that handles a single member
15924 handle_struct_member_die (struct die_info *child_die, struct type *type,
15925 struct field_info *fi,
15926 std::vector<struct symbol *> *template_args,
15927 struct dwarf2_cu *cu)
15929 if (child_die->tag == DW_TAG_member
15930 || child_die->tag == DW_TAG_variable
15931 || child_die->tag == DW_TAG_variant_part)
15933 /* NOTE: carlton/2002-11-05: A C++ static data member
15934 should be a DW_TAG_member that is a declaration, but
15935 all versions of G++ as of this writing (so through at
15936 least 3.2.1) incorrectly generate DW_TAG_variable
15937 tags for them instead. */
15938 dwarf2_add_field (fi, child_die, cu);
15940 else if (child_die->tag == DW_TAG_subprogram)
15942 /* Rust doesn't have member functions in the C++ sense.
15943 However, it does emit ordinary functions as children
15944 of a struct DIE. */
15945 if (cu->language == language_rust)
15946 read_func_scope (child_die, cu);
15949 /* C++ member function. */
15950 dwarf2_add_member_fn (fi, child_die, type, cu);
15953 else if (child_die->tag == DW_TAG_inheritance)
15955 /* C++ base class field. */
15956 dwarf2_add_field (fi, child_die, cu);
15958 else if (type_can_define_types (child_die))
15959 dwarf2_add_type_defn (fi, child_die, cu);
15960 else if (child_die->tag == DW_TAG_template_type_param
15961 || child_die->tag == DW_TAG_template_value_param)
15963 struct symbol *arg = new_symbol (child_die, NULL, cu);
15966 template_args->push_back (arg);
15968 else if (child_die->tag == DW_TAG_variant)
15970 /* In a variant we want to get the discriminant and also add a
15971 field for our sole member child. */
15972 struct attribute *discr = dwarf2_attr (child_die, DW_AT_discr_value, cu);
15974 for (die_info *variant_child = child_die->child;
15975 variant_child != NULL;
15976 variant_child = sibling_die (variant_child))
15978 if (variant_child->tag == DW_TAG_member)
15980 handle_struct_member_die (variant_child, type, fi,
15981 template_args, cu);
15982 /* Only handle the one. */
15987 /* We don't handle this but we might as well report it if we see
15989 if (dwarf2_attr (child_die, DW_AT_discr_list, cu) != nullptr)
15990 complaint (_("DW_AT_discr_list is not supported yet"
15991 " - DIE at %s [in module %s]"),
15992 sect_offset_str (child_die->sect_off),
15993 objfile_name (cu->per_cu->dwarf2_per_objfile->objfile));
15995 /* The first field was just added, so we can stash the
15996 discriminant there. */
15997 gdb_assert (!fi->fields.empty ());
15999 fi->fields.back ().variant.default_branch = true;
16001 fi->fields.back ().variant.discriminant_value = DW_UNSND (discr);
16005 /* Finish creating a structure or union type, including filling in
16006 its members and creating a symbol for it. */
16009 process_structure_scope (struct die_info *die, struct dwarf2_cu *cu)
16011 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
16012 struct die_info *child_die;
16015 type = get_die_type (die, cu);
16017 type = read_structure_type (die, cu);
16019 /* When reading a DW_TAG_variant_part, we need to notice when we
16020 read the discriminant member, so we can record it later in the
16021 discriminant_info. */
16022 bool is_variant_part = TYPE_FLAG_DISCRIMINATED_UNION (type);
16023 sect_offset discr_offset;
16024 bool has_template_parameters = false;
16026 if (is_variant_part)
16028 struct attribute *discr = dwarf2_attr (die, DW_AT_discr, cu);
16031 /* Maybe it's a univariant form, an extension we support.
16032 In this case arrange not to check the offset. */
16033 is_variant_part = false;
16035 else if (attr_form_is_ref (discr))
16037 struct dwarf2_cu *target_cu = cu;
16038 struct die_info *target_die = follow_die_ref (die, discr, &target_cu);
16040 discr_offset = target_die->sect_off;
16044 complaint (_("DW_AT_discr does not have DIE reference form"
16045 " - DIE at %s [in module %s]"),
16046 sect_offset_str (die->sect_off),
16047 objfile_name (cu->per_cu->dwarf2_per_objfile->objfile));
16048 is_variant_part = false;
16052 if (die->child != NULL && ! die_is_declaration (die, cu))
16054 struct field_info fi;
16055 std::vector<struct symbol *> template_args;
16057 child_die = die->child;
16059 while (child_die && child_die->tag)
16061 handle_struct_member_die (child_die, type, &fi, &template_args, cu);
16063 if (is_variant_part && discr_offset == child_die->sect_off)
16064 fi.fields.back ().variant.is_discriminant = true;
16066 child_die = sibling_die (child_die);
16069 /* Attach template arguments to type. */
16070 if (!template_args.empty ())
16072 has_template_parameters = true;
16073 ALLOCATE_CPLUS_STRUCT_TYPE (type);
16074 TYPE_N_TEMPLATE_ARGUMENTS (type) = template_args.size ();
16075 TYPE_TEMPLATE_ARGUMENTS (type)
16076 = XOBNEWVEC (&objfile->objfile_obstack,
16078 TYPE_N_TEMPLATE_ARGUMENTS (type));
16079 memcpy (TYPE_TEMPLATE_ARGUMENTS (type),
16080 template_args.data (),
16081 (TYPE_N_TEMPLATE_ARGUMENTS (type)
16082 * sizeof (struct symbol *)));
16085 /* Attach fields and member functions to the type. */
16087 dwarf2_attach_fields_to_type (&fi, type, cu);
16088 if (!fi.fnfieldlists.empty ())
16090 dwarf2_attach_fn_fields_to_type (&fi, type, cu);
16092 /* Get the type which refers to the base class (possibly this
16093 class itself) which contains the vtable pointer for the current
16094 class from the DW_AT_containing_type attribute. This use of
16095 DW_AT_containing_type is a GNU extension. */
16097 if (dwarf2_attr (die, DW_AT_containing_type, cu) != NULL)
16099 struct type *t = die_containing_type (die, cu);
16101 set_type_vptr_basetype (type, t);
16106 /* Our own class provides vtbl ptr. */
16107 for (i = TYPE_NFIELDS (t) - 1;
16108 i >= TYPE_N_BASECLASSES (t);
16111 const char *fieldname = TYPE_FIELD_NAME (t, i);
16113 if (is_vtable_name (fieldname, cu))
16115 set_type_vptr_fieldno (type, i);
16120 /* Complain if virtual function table field not found. */
16121 if (i < TYPE_N_BASECLASSES (t))
16122 complaint (_("virtual function table pointer "
16123 "not found when defining class '%s'"),
16124 TYPE_NAME (type) ? TYPE_NAME (type) : "");
16128 set_type_vptr_fieldno (type, TYPE_VPTR_FIELDNO (t));
16131 else if (cu->producer
16132 && startswith (cu->producer, "IBM(R) XL C/C++ Advanced Edition"))
16134 /* The IBM XLC compiler does not provide direct indication
16135 of the containing type, but the vtable pointer is
16136 always named __vfp. */
16140 for (i = TYPE_NFIELDS (type) - 1;
16141 i >= TYPE_N_BASECLASSES (type);
16144 if (strcmp (TYPE_FIELD_NAME (type, i), "__vfp") == 0)
16146 set_type_vptr_fieldno (type, i);
16147 set_type_vptr_basetype (type, type);
16154 /* Copy fi.typedef_field_list linked list elements content into the
16155 allocated array TYPE_TYPEDEF_FIELD_ARRAY (type). */
16156 if (!fi.typedef_field_list.empty ())
16158 int count = fi.typedef_field_list.size ();
16160 ALLOCATE_CPLUS_STRUCT_TYPE (type);
16161 TYPE_TYPEDEF_FIELD_ARRAY (type)
16162 = ((struct decl_field *)
16164 sizeof (TYPE_TYPEDEF_FIELD (type, 0)) * count));
16165 TYPE_TYPEDEF_FIELD_COUNT (type) = count;
16167 for (int i = 0; i < fi.typedef_field_list.size (); ++i)
16168 TYPE_TYPEDEF_FIELD (type, i) = fi.typedef_field_list[i];
16171 /* Copy fi.nested_types_list linked list elements content into the
16172 allocated array TYPE_NESTED_TYPES_ARRAY (type). */
16173 if (!fi.nested_types_list.empty () && cu->language != language_ada)
16175 int count = fi.nested_types_list.size ();
16177 ALLOCATE_CPLUS_STRUCT_TYPE (type);
16178 TYPE_NESTED_TYPES_ARRAY (type)
16179 = ((struct decl_field *)
16180 TYPE_ALLOC (type, sizeof (struct decl_field) * count));
16181 TYPE_NESTED_TYPES_COUNT (type) = count;
16183 for (int i = 0; i < fi.nested_types_list.size (); ++i)
16184 TYPE_NESTED_TYPES_FIELD (type, i) = fi.nested_types_list[i];
16188 quirk_gcc_member_function_pointer (type, objfile);
16189 if (cu->language == language_rust && die->tag == DW_TAG_union_type)
16190 cu->rust_unions.push_back (type);
16192 /* NOTE: carlton/2004-03-16: GCC 3.4 (or at least one of its
16193 snapshots) has been known to create a die giving a declaration
16194 for a class that has, as a child, a die giving a definition for a
16195 nested class. So we have to process our children even if the
16196 current die is a declaration. Normally, of course, a declaration
16197 won't have any children at all. */
16199 child_die = die->child;
16201 while (child_die != NULL && child_die->tag)
16203 if (child_die->tag == DW_TAG_member
16204 || child_die->tag == DW_TAG_variable
16205 || child_die->tag == DW_TAG_inheritance
16206 || child_die->tag == DW_TAG_template_value_param
16207 || child_die->tag == DW_TAG_template_type_param)
16212 process_die (child_die, cu);
16214 child_die = sibling_die (child_die);
16217 /* Do not consider external references. According to the DWARF standard,
16218 these DIEs are identified by the fact that they have no byte_size
16219 attribute, and a declaration attribute. */
16220 if (dwarf2_attr (die, DW_AT_byte_size, cu) != NULL
16221 || !die_is_declaration (die, cu))
16223 struct symbol *sym = new_symbol (die, type, cu);
16225 if (has_template_parameters)
16227 struct symtab *symtab;
16228 if (sym != nullptr)
16229 symtab = symbol_symtab (sym);
16230 else if (cu->line_header != nullptr)
16232 /* Any related symtab will do. */
16234 = cu->line_header->file_name_at (file_name_index (1))->symtab;
16239 complaint (_("could not find suitable "
16240 "symtab for template parameter"
16241 " - DIE at %s [in module %s]"),
16242 sect_offset_str (die->sect_off),
16243 objfile_name (objfile));
16246 if (symtab != nullptr)
16248 /* Make sure that the symtab is set on the new symbols.
16249 Even though they don't appear in this symtab directly,
16250 other parts of gdb assume that symbols do, and this is
16251 reasonably true. */
16252 for (int i = 0; i < TYPE_N_TEMPLATE_ARGUMENTS (type); ++i)
16253 symbol_set_symtab (TYPE_TEMPLATE_ARGUMENT (type, i), symtab);
16259 /* Assuming DIE is an enumeration type, and TYPE is its associated type,
16260 update TYPE using some information only available in DIE's children. */
16263 update_enumeration_type_from_children (struct die_info *die,
16265 struct dwarf2_cu *cu)
16267 struct die_info *child_die;
16268 int unsigned_enum = 1;
16272 auto_obstack obstack;
16274 for (child_die = die->child;
16275 child_die != NULL && child_die->tag;
16276 child_die = sibling_die (child_die))
16278 struct attribute *attr;
16280 const gdb_byte *bytes;
16281 struct dwarf2_locexpr_baton *baton;
16284 if (child_die->tag != DW_TAG_enumerator)
16287 attr = dwarf2_attr (child_die, DW_AT_const_value, cu);
16291 name = dwarf2_name (child_die, cu);
16293 name = "<anonymous enumerator>";
16295 dwarf2_const_value_attr (attr, type, name, &obstack, cu,
16296 &value, &bytes, &baton);
16302 else if ((mask & value) != 0)
16307 /* If we already know that the enum type is neither unsigned, nor
16308 a flag type, no need to look at the rest of the enumerates. */
16309 if (!unsigned_enum && !flag_enum)
16314 TYPE_UNSIGNED (type) = 1;
16316 TYPE_FLAG_ENUM (type) = 1;
16319 /* Given a DW_AT_enumeration_type die, set its type. We do not
16320 complete the type's fields yet, or create any symbols. */
16322 static struct type *
16323 read_enumeration_type (struct die_info *die, struct dwarf2_cu *cu)
16325 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
16327 struct attribute *attr;
16330 /* If the definition of this type lives in .debug_types, read that type.
16331 Don't follow DW_AT_specification though, that will take us back up
16332 the chain and we want to go down. */
16333 attr = dwarf2_attr_no_follow (die, DW_AT_signature);
16336 type = get_DW_AT_signature_type (die, attr, cu);
16338 /* The type's CU may not be the same as CU.
16339 Ensure TYPE is recorded with CU in die_type_hash. */
16340 return set_die_type (die, type, cu);
16343 type = alloc_type (objfile);
16345 TYPE_CODE (type) = TYPE_CODE_ENUM;
16346 name = dwarf2_full_name (NULL, die, cu);
16348 TYPE_NAME (type) = name;
16350 attr = dwarf2_attr (die, DW_AT_type, cu);
16353 struct type *underlying_type = die_type (die, cu);
16355 TYPE_TARGET_TYPE (type) = underlying_type;
16358 attr = dwarf2_attr (die, DW_AT_byte_size, cu);
16361 TYPE_LENGTH (type) = DW_UNSND (attr);
16365 TYPE_LENGTH (type) = 0;
16368 maybe_set_alignment (cu, die, type);
16370 /* The enumeration DIE can be incomplete. In Ada, any type can be
16371 declared as private in the package spec, and then defined only
16372 inside the package body. Such types are known as Taft Amendment
16373 Types. When another package uses such a type, an incomplete DIE
16374 may be generated by the compiler. */
16375 if (die_is_declaration (die, cu))
16376 TYPE_STUB (type) = 1;
16378 /* Finish the creation of this type by using the enum's children.
16379 We must call this even when the underlying type has been provided
16380 so that we can determine if we're looking at a "flag" enum. */
16381 update_enumeration_type_from_children (die, type, cu);
16383 /* If this type has an underlying type that is not a stub, then we
16384 may use its attributes. We always use the "unsigned" attribute
16385 in this situation, because ordinarily we guess whether the type
16386 is unsigned -- but the guess can be wrong and the underlying type
16387 can tell us the reality. However, we defer to a local size
16388 attribute if one exists, because this lets the compiler override
16389 the underlying type if needed. */
16390 if (TYPE_TARGET_TYPE (type) != NULL && !TYPE_STUB (TYPE_TARGET_TYPE (type)))
16392 TYPE_UNSIGNED (type) = TYPE_UNSIGNED (TYPE_TARGET_TYPE (type));
16393 if (TYPE_LENGTH (type) == 0)
16394 TYPE_LENGTH (type) = TYPE_LENGTH (TYPE_TARGET_TYPE (type));
16395 if (TYPE_RAW_ALIGN (type) == 0
16396 && TYPE_RAW_ALIGN (TYPE_TARGET_TYPE (type)) != 0)
16397 set_type_align (type, TYPE_RAW_ALIGN (TYPE_TARGET_TYPE (type)));
16400 TYPE_DECLARED_CLASS (type) = dwarf2_flag_true_p (die, DW_AT_enum_class, cu);
16402 return set_die_type (die, type, cu);
16405 /* Given a pointer to a die which begins an enumeration, process all
16406 the dies that define the members of the enumeration, and create the
16407 symbol for the enumeration type.
16409 NOTE: We reverse the order of the element list. */
16412 process_enumeration_scope (struct die_info *die, struct dwarf2_cu *cu)
16414 struct type *this_type;
16416 this_type = get_die_type (die, cu);
16417 if (this_type == NULL)
16418 this_type = read_enumeration_type (die, cu);
16420 if (die->child != NULL)
16422 struct die_info *child_die;
16423 struct symbol *sym;
16424 struct field *fields = NULL;
16425 int num_fields = 0;
16428 child_die = die->child;
16429 while (child_die && child_die->tag)
16431 if (child_die->tag != DW_TAG_enumerator)
16433 process_die (child_die, cu);
16437 name = dwarf2_name (child_die, cu);
16440 sym = new_symbol (child_die, this_type, cu);
16442 if ((num_fields % DW_FIELD_ALLOC_CHUNK) == 0)
16444 fields = (struct field *)
16446 (num_fields + DW_FIELD_ALLOC_CHUNK)
16447 * sizeof (struct field));
16450 FIELD_NAME (fields[num_fields]) = SYMBOL_LINKAGE_NAME (sym);
16451 FIELD_TYPE (fields[num_fields]) = NULL;
16452 SET_FIELD_ENUMVAL (fields[num_fields], SYMBOL_VALUE (sym));
16453 FIELD_BITSIZE (fields[num_fields]) = 0;
16459 child_die = sibling_die (child_die);
16464 TYPE_NFIELDS (this_type) = num_fields;
16465 TYPE_FIELDS (this_type) = (struct field *)
16466 TYPE_ALLOC (this_type, sizeof (struct field) * num_fields);
16467 memcpy (TYPE_FIELDS (this_type), fields,
16468 sizeof (struct field) * num_fields);
16473 /* If we are reading an enum from a .debug_types unit, and the enum
16474 is a declaration, and the enum is not the signatured type in the
16475 unit, then we do not want to add a symbol for it. Adding a
16476 symbol would in some cases obscure the true definition of the
16477 enum, giving users an incomplete type when the definition is
16478 actually available. Note that we do not want to do this for all
16479 enums which are just declarations, because C++0x allows forward
16480 enum declarations. */
16481 if (cu->per_cu->is_debug_types
16482 && die_is_declaration (die, cu))
16484 struct signatured_type *sig_type;
16486 sig_type = (struct signatured_type *) cu->per_cu;
16487 gdb_assert (to_underlying (sig_type->type_offset_in_section) != 0);
16488 if (sig_type->type_offset_in_section != die->sect_off)
16492 new_symbol (die, this_type, cu);
16495 /* Extract all information from a DW_TAG_array_type DIE and put it in
16496 the DIE's type field. For now, this only handles one dimensional
16499 static struct type *
16500 read_array_type (struct die_info *die, struct dwarf2_cu *cu)
16502 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
16503 struct die_info *child_die;
16505 struct type *element_type, *range_type, *index_type;
16506 struct attribute *attr;
16508 struct dynamic_prop *byte_stride_prop = NULL;
16509 unsigned int bit_stride = 0;
16511 element_type = die_type (die, cu);
16513 /* The die_type call above may have already set the type for this DIE. */
16514 type = get_die_type (die, cu);
16518 attr = dwarf2_attr (die, DW_AT_byte_stride, cu);
16524 = (struct dynamic_prop *) alloca (sizeof (struct dynamic_prop));
16525 stride_ok = attr_to_dynamic_prop (attr, die, cu, byte_stride_prop);
16528 complaint (_("unable to read array DW_AT_byte_stride "
16529 " - DIE at %s [in module %s]"),
16530 sect_offset_str (die->sect_off),
16531 objfile_name (cu->per_cu->dwarf2_per_objfile->objfile));
16532 /* Ignore this attribute. We will likely not be able to print
16533 arrays of this type correctly, but there is little we can do
16534 to help if we cannot read the attribute's value. */
16535 byte_stride_prop = NULL;
16539 attr = dwarf2_attr (die, DW_AT_bit_stride, cu);
16541 bit_stride = DW_UNSND (attr);
16543 /* Irix 6.2 native cc creates array types without children for
16544 arrays with unspecified length. */
16545 if (die->child == NULL)
16547 index_type = objfile_type (objfile)->builtin_int;
16548 range_type = create_static_range_type (NULL, index_type, 0, -1);
16549 type = create_array_type_with_stride (NULL, element_type, range_type,
16550 byte_stride_prop, bit_stride);
16551 return set_die_type (die, type, cu);
16554 std::vector<struct type *> range_types;
16555 child_die = die->child;
16556 while (child_die && child_die->tag)
16558 if (child_die->tag == DW_TAG_subrange_type)
16560 struct type *child_type = read_type_die (child_die, cu);
16562 if (child_type != NULL)
16564 /* The range type was succesfully read. Save it for the
16565 array type creation. */
16566 range_types.push_back (child_type);
16569 child_die = sibling_die (child_die);
16572 /* Dwarf2 dimensions are output from left to right, create the
16573 necessary array types in backwards order. */
16575 type = element_type;
16577 if (read_array_order (die, cu) == DW_ORD_col_major)
16581 while (i < range_types.size ())
16582 type = create_array_type_with_stride (NULL, type, range_types[i++],
16583 byte_stride_prop, bit_stride);
16587 size_t ndim = range_types.size ();
16589 type = create_array_type_with_stride (NULL, type, range_types[ndim],
16590 byte_stride_prop, bit_stride);
16593 /* Understand Dwarf2 support for vector types (like they occur on
16594 the PowerPC w/ AltiVec). Gcc just adds another attribute to the
16595 array type. This is not part of the Dwarf2/3 standard yet, but a
16596 custom vendor extension. The main difference between a regular
16597 array and the vector variant is that vectors are passed by value
16599 attr = dwarf2_attr (die, DW_AT_GNU_vector, cu);
16601 make_vector_type (type);
16603 /* The DIE may have DW_AT_byte_size set. For example an OpenCL
16604 implementation may choose to implement triple vectors using this
16606 attr = dwarf2_attr (die, DW_AT_byte_size, cu);
16609 if (DW_UNSND (attr) >= TYPE_LENGTH (type))
16610 TYPE_LENGTH (type) = DW_UNSND (attr);
16612 complaint (_("DW_AT_byte_size for array type smaller "
16613 "than the total size of elements"));
16616 name = dwarf2_name (die, cu);
16618 TYPE_NAME (type) = name;
16620 maybe_set_alignment (cu, die, type);
16622 /* Install the type in the die. */
16623 set_die_type (die, type, cu);
16625 /* set_die_type should be already done. */
16626 set_descriptive_type (type, die, cu);
16631 static enum dwarf_array_dim_ordering
16632 read_array_order (struct die_info *die, struct dwarf2_cu *cu)
16634 struct attribute *attr;
16636 attr = dwarf2_attr (die, DW_AT_ordering, cu);
16639 return (enum dwarf_array_dim_ordering) DW_SND (attr);
16641 /* GNU F77 is a special case, as at 08/2004 array type info is the
16642 opposite order to the dwarf2 specification, but data is still
16643 laid out as per normal fortran.
16645 FIXME: dsl/2004-8-20: If G77 is ever fixed, this will also need
16646 version checking. */
16648 if (cu->language == language_fortran
16649 && cu->producer && strstr (cu->producer, "GNU F77"))
16651 return DW_ORD_row_major;
16654 switch (cu->language_defn->la_array_ordering)
16656 case array_column_major:
16657 return DW_ORD_col_major;
16658 case array_row_major:
16660 return DW_ORD_row_major;
16664 /* Extract all information from a DW_TAG_set_type DIE and put it in
16665 the DIE's type field. */
16667 static struct type *
16668 read_set_type (struct die_info *die, struct dwarf2_cu *cu)
16670 struct type *domain_type, *set_type;
16671 struct attribute *attr;
16673 domain_type = die_type (die, cu);
16675 /* The die_type call above may have already set the type for this DIE. */
16676 set_type = get_die_type (die, cu);
16680 set_type = create_set_type (NULL, domain_type);
16682 attr = dwarf2_attr (die, DW_AT_byte_size, cu);
16684 TYPE_LENGTH (set_type) = DW_UNSND (attr);
16686 maybe_set_alignment (cu, die, set_type);
16688 return set_die_type (die, set_type, cu);
16691 /* A helper for read_common_block that creates a locexpr baton.
16692 SYM is the symbol which we are marking as computed.
16693 COMMON_DIE is the DIE for the common block.
16694 COMMON_LOC is the location expression attribute for the common
16696 MEMBER_LOC is the location expression attribute for the particular
16697 member of the common block that we are processing.
16698 CU is the CU from which the above come. */
16701 mark_common_block_symbol_computed (struct symbol *sym,
16702 struct die_info *common_die,
16703 struct attribute *common_loc,
16704 struct attribute *member_loc,
16705 struct dwarf2_cu *cu)
16707 struct dwarf2_per_objfile *dwarf2_per_objfile
16708 = cu->per_cu->dwarf2_per_objfile;
16709 struct objfile *objfile = dwarf2_per_objfile->objfile;
16710 struct dwarf2_locexpr_baton *baton;
16712 unsigned int cu_off;
16713 enum bfd_endian byte_order = gdbarch_byte_order (get_objfile_arch (objfile));
16714 LONGEST offset = 0;
16716 gdb_assert (common_loc && member_loc);
16717 gdb_assert (attr_form_is_block (common_loc));
16718 gdb_assert (attr_form_is_block (member_loc)
16719 || attr_form_is_constant (member_loc));
16721 baton = XOBNEW (&objfile->objfile_obstack, struct dwarf2_locexpr_baton);
16722 baton->per_cu = cu->per_cu;
16723 gdb_assert (baton->per_cu);
16725 baton->size = 5 /* DW_OP_call4 */ + 1 /* DW_OP_plus */;
16727 if (attr_form_is_constant (member_loc))
16729 offset = dwarf2_get_attr_constant_value (member_loc, 0);
16730 baton->size += 1 /* DW_OP_addr */ + cu->header.addr_size;
16733 baton->size += DW_BLOCK (member_loc)->size;
16735 ptr = (gdb_byte *) obstack_alloc (&objfile->objfile_obstack, baton->size);
16738 *ptr++ = DW_OP_call4;
16739 cu_off = common_die->sect_off - cu->per_cu->sect_off;
16740 store_unsigned_integer (ptr, 4, byte_order, cu_off);
16743 if (attr_form_is_constant (member_loc))
16745 *ptr++ = DW_OP_addr;
16746 store_unsigned_integer (ptr, cu->header.addr_size, byte_order, offset);
16747 ptr += cu->header.addr_size;
16751 /* We have to copy the data here, because DW_OP_call4 will only
16752 use a DW_AT_location attribute. */
16753 memcpy (ptr, DW_BLOCK (member_loc)->data, DW_BLOCK (member_loc)->size);
16754 ptr += DW_BLOCK (member_loc)->size;
16757 *ptr++ = DW_OP_plus;
16758 gdb_assert (ptr - baton->data == baton->size);
16760 SYMBOL_LOCATION_BATON (sym) = baton;
16761 SYMBOL_ACLASS_INDEX (sym) = dwarf2_locexpr_index;
16764 /* Create appropriate locally-scoped variables for all the
16765 DW_TAG_common_block entries. Also create a struct common_block
16766 listing all such variables for `info common'. COMMON_BLOCK_DOMAIN
16767 is used to sepate the common blocks name namespace from regular
16771 read_common_block (struct die_info *die, struct dwarf2_cu *cu)
16773 struct attribute *attr;
16775 attr = dwarf2_attr (die, DW_AT_location, cu);
16778 /* Support the .debug_loc offsets. */
16779 if (attr_form_is_block (attr))
16783 else if (attr_form_is_section_offset (attr))
16785 dwarf2_complex_location_expr_complaint ();
16790 dwarf2_invalid_attrib_class_complaint ("DW_AT_location",
16791 "common block member");
16796 if (die->child != NULL)
16798 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
16799 struct die_info *child_die;
16800 size_t n_entries = 0, size;
16801 struct common_block *common_block;
16802 struct symbol *sym;
16804 for (child_die = die->child;
16805 child_die && child_die->tag;
16806 child_die = sibling_die (child_die))
16809 size = (sizeof (struct common_block)
16810 + (n_entries - 1) * sizeof (struct symbol *));
16812 = (struct common_block *) obstack_alloc (&objfile->objfile_obstack,
16814 memset (common_block->contents, 0, n_entries * sizeof (struct symbol *));
16815 common_block->n_entries = 0;
16817 for (child_die = die->child;
16818 child_die && child_die->tag;
16819 child_die = sibling_die (child_die))
16821 /* Create the symbol in the DW_TAG_common_block block in the current
16823 sym = new_symbol (child_die, NULL, cu);
16826 struct attribute *member_loc;
16828 common_block->contents[common_block->n_entries++] = sym;
16830 member_loc = dwarf2_attr (child_die, DW_AT_data_member_location,
16834 /* GDB has handled this for a long time, but it is
16835 not specified by DWARF. It seems to have been
16836 emitted by gfortran at least as recently as:
16837 http://gcc.gnu.org/bugzilla/show_bug.cgi?id=23057. */
16838 complaint (_("Variable in common block has "
16839 "DW_AT_data_member_location "
16840 "- DIE at %s [in module %s]"),
16841 sect_offset_str (child_die->sect_off),
16842 objfile_name (objfile));
16844 if (attr_form_is_section_offset (member_loc))
16845 dwarf2_complex_location_expr_complaint ();
16846 else if (attr_form_is_constant (member_loc)
16847 || attr_form_is_block (member_loc))
16850 mark_common_block_symbol_computed (sym, die, attr,
16854 dwarf2_complex_location_expr_complaint ();
16859 sym = new_symbol (die, objfile_type (objfile)->builtin_void, cu);
16860 SYMBOL_VALUE_COMMON_BLOCK (sym) = common_block;
16864 /* Create a type for a C++ namespace. */
16866 static struct type *
16867 read_namespace_type (struct die_info *die, struct dwarf2_cu *cu)
16869 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
16870 const char *previous_prefix, *name;
16874 /* For extensions, reuse the type of the original namespace. */
16875 if (dwarf2_attr (die, DW_AT_extension, cu) != NULL)
16877 struct die_info *ext_die;
16878 struct dwarf2_cu *ext_cu = cu;
16880 ext_die = dwarf2_extension (die, &ext_cu);
16881 type = read_type_die (ext_die, ext_cu);
16883 /* EXT_CU may not be the same as CU.
16884 Ensure TYPE is recorded with CU in die_type_hash. */
16885 return set_die_type (die, type, cu);
16888 name = namespace_name (die, &is_anonymous, cu);
16890 /* Now build the name of the current namespace. */
16892 previous_prefix = determine_prefix (die, cu);
16893 if (previous_prefix[0] != '\0')
16894 name = typename_concat (&objfile->objfile_obstack,
16895 previous_prefix, name, 0, cu);
16897 /* Create the type. */
16898 type = init_type (objfile, TYPE_CODE_NAMESPACE, 0, name);
16900 return set_die_type (die, type, cu);
16903 /* Read a namespace scope. */
16906 read_namespace (struct die_info *die, struct dwarf2_cu *cu)
16908 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
16911 /* Add a symbol associated to this if we haven't seen the namespace
16912 before. Also, add a using directive if it's an anonymous
16915 if (dwarf2_attr (die, DW_AT_extension, cu) == NULL)
16919 type = read_type_die (die, cu);
16920 new_symbol (die, type, cu);
16922 namespace_name (die, &is_anonymous, cu);
16925 const char *previous_prefix = determine_prefix (die, cu);
16927 std::vector<const char *> excludes;
16928 add_using_directive (using_directives (cu),
16929 previous_prefix, TYPE_NAME (type), NULL,
16930 NULL, excludes, 0, &objfile->objfile_obstack);
16934 if (die->child != NULL)
16936 struct die_info *child_die = die->child;
16938 while (child_die && child_die->tag)
16940 process_die (child_die, cu);
16941 child_die = sibling_die (child_die);
16946 /* Read a Fortran module as type. This DIE can be only a declaration used for
16947 imported module. Still we need that type as local Fortran "use ... only"
16948 declaration imports depend on the created type in determine_prefix. */
16950 static struct type *
16951 read_module_type (struct die_info *die, struct dwarf2_cu *cu)
16953 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
16954 const char *module_name;
16957 module_name = dwarf2_name (die, cu);
16959 complaint (_("DW_TAG_module has no name, offset %s"),
16960 sect_offset_str (die->sect_off));
16961 type = init_type (objfile, TYPE_CODE_MODULE, 0, module_name);
16963 return set_die_type (die, type, cu);
16966 /* Read a Fortran module. */
16969 read_module (struct die_info *die, struct dwarf2_cu *cu)
16971 struct die_info *child_die = die->child;
16974 type = read_type_die (die, cu);
16975 new_symbol (die, type, cu);
16977 while (child_die && child_die->tag)
16979 process_die (child_die, cu);
16980 child_die = sibling_die (child_die);
16984 /* Return the name of the namespace represented by DIE. Set
16985 *IS_ANONYMOUS to tell whether or not the namespace is an anonymous
16988 static const char *
16989 namespace_name (struct die_info *die, int *is_anonymous, struct dwarf2_cu *cu)
16991 struct die_info *current_die;
16992 const char *name = NULL;
16994 /* Loop through the extensions until we find a name. */
16996 for (current_die = die;
16997 current_die != NULL;
16998 current_die = dwarf2_extension (die, &cu))
17000 /* We don't use dwarf2_name here so that we can detect the absence
17001 of a name -> anonymous namespace. */
17002 name = dwarf2_string_attr (die, DW_AT_name, cu);
17008 /* Is it an anonymous namespace? */
17010 *is_anonymous = (name == NULL);
17012 name = CP_ANONYMOUS_NAMESPACE_STR;
17017 /* Extract all information from a DW_TAG_pointer_type DIE and add to
17018 the user defined type vector. */
17020 static struct type *
17021 read_tag_pointer_type (struct die_info *die, struct dwarf2_cu *cu)
17023 struct gdbarch *gdbarch
17024 = get_objfile_arch (cu->per_cu->dwarf2_per_objfile->objfile);
17025 struct comp_unit_head *cu_header = &cu->header;
17027 struct attribute *attr_byte_size;
17028 struct attribute *attr_address_class;
17029 int byte_size, addr_class;
17030 struct type *target_type;
17032 target_type = die_type (die, cu);
17034 /* The die_type call above may have already set the type for this DIE. */
17035 type = get_die_type (die, cu);
17039 type = lookup_pointer_type (target_type);
17041 attr_byte_size = dwarf2_attr (die, DW_AT_byte_size, cu);
17042 if (attr_byte_size)
17043 byte_size = DW_UNSND (attr_byte_size);
17045 byte_size = cu_header->addr_size;
17047 attr_address_class = dwarf2_attr (die, DW_AT_address_class, cu);
17048 if (attr_address_class)
17049 addr_class = DW_UNSND (attr_address_class);
17051 addr_class = DW_ADDR_none;
17053 ULONGEST alignment = get_alignment (cu, die);
17055 /* If the pointer size, alignment, or address class is different
17056 than the default, create a type variant marked as such and set
17057 the length accordingly. */
17058 if (TYPE_LENGTH (type) != byte_size
17059 || (alignment != 0 && TYPE_RAW_ALIGN (type) != 0
17060 && alignment != TYPE_RAW_ALIGN (type))
17061 || addr_class != DW_ADDR_none)
17063 if (gdbarch_address_class_type_flags_p (gdbarch))
17067 type_flags = gdbarch_address_class_type_flags
17068 (gdbarch, byte_size, addr_class);
17069 gdb_assert ((type_flags & ~TYPE_INSTANCE_FLAG_ADDRESS_CLASS_ALL)
17071 type = make_type_with_address_space (type, type_flags);
17073 else if (TYPE_LENGTH (type) != byte_size)
17075 complaint (_("invalid pointer size %d"), byte_size);
17077 else if (TYPE_RAW_ALIGN (type) != alignment)
17079 complaint (_("Invalid DW_AT_alignment"
17080 " - DIE at %s [in module %s]"),
17081 sect_offset_str (die->sect_off),
17082 objfile_name (cu->per_cu->dwarf2_per_objfile->objfile));
17086 /* Should we also complain about unhandled address classes? */
17090 TYPE_LENGTH (type) = byte_size;
17091 set_type_align (type, alignment);
17092 return set_die_type (die, type, cu);
17095 /* Extract all information from a DW_TAG_ptr_to_member_type DIE and add to
17096 the user defined type vector. */
17098 static struct type *
17099 read_tag_ptr_to_member_type (struct die_info *die, struct dwarf2_cu *cu)
17102 struct type *to_type;
17103 struct type *domain;
17105 to_type = die_type (die, cu);
17106 domain = die_containing_type (die, cu);
17108 /* The calls above may have already set the type for this DIE. */
17109 type = get_die_type (die, cu);
17113 if (TYPE_CODE (check_typedef (to_type)) == TYPE_CODE_METHOD)
17114 type = lookup_methodptr_type (to_type);
17115 else if (TYPE_CODE (check_typedef (to_type)) == TYPE_CODE_FUNC)
17117 struct type *new_type
17118 = alloc_type (cu->per_cu->dwarf2_per_objfile->objfile);
17120 smash_to_method_type (new_type, domain, TYPE_TARGET_TYPE (to_type),
17121 TYPE_FIELDS (to_type), TYPE_NFIELDS (to_type),
17122 TYPE_VARARGS (to_type));
17123 type = lookup_methodptr_type (new_type);
17126 type = lookup_memberptr_type (to_type, domain);
17128 return set_die_type (die, type, cu);
17131 /* Extract all information from a DW_TAG_{rvalue_,}reference_type DIE and add to
17132 the user defined type vector. */
17134 static struct type *
17135 read_tag_reference_type (struct die_info *die, struct dwarf2_cu *cu,
17136 enum type_code refcode)
17138 struct comp_unit_head *cu_header = &cu->header;
17139 struct type *type, *target_type;
17140 struct attribute *attr;
17142 gdb_assert (refcode == TYPE_CODE_REF || refcode == TYPE_CODE_RVALUE_REF);
17144 target_type = die_type (die, cu);
17146 /* The die_type call above may have already set the type for this DIE. */
17147 type = get_die_type (die, cu);
17151 type = lookup_reference_type (target_type, refcode);
17152 attr = dwarf2_attr (die, DW_AT_byte_size, cu);
17155 TYPE_LENGTH (type) = DW_UNSND (attr);
17159 TYPE_LENGTH (type) = cu_header->addr_size;
17161 maybe_set_alignment (cu, die, type);
17162 return set_die_type (die, type, cu);
17165 /* Add the given cv-qualifiers to the element type of the array. GCC
17166 outputs DWARF type qualifiers that apply to an array, not the
17167 element type. But GDB relies on the array element type to carry
17168 the cv-qualifiers. This mimics section 6.7.3 of the C99
17171 static struct type *
17172 add_array_cv_type (struct die_info *die, struct dwarf2_cu *cu,
17173 struct type *base_type, int cnst, int voltl)
17175 struct type *el_type, *inner_array;
17177 base_type = copy_type (base_type);
17178 inner_array = base_type;
17180 while (TYPE_CODE (TYPE_TARGET_TYPE (inner_array)) == TYPE_CODE_ARRAY)
17182 TYPE_TARGET_TYPE (inner_array) =
17183 copy_type (TYPE_TARGET_TYPE (inner_array));
17184 inner_array = TYPE_TARGET_TYPE (inner_array);
17187 el_type = TYPE_TARGET_TYPE (inner_array);
17188 cnst |= TYPE_CONST (el_type);
17189 voltl |= TYPE_VOLATILE (el_type);
17190 TYPE_TARGET_TYPE (inner_array) = make_cv_type (cnst, voltl, el_type, NULL);
17192 return set_die_type (die, base_type, cu);
17195 static struct type *
17196 read_tag_const_type (struct die_info *die, struct dwarf2_cu *cu)
17198 struct type *base_type, *cv_type;
17200 base_type = die_type (die, cu);
17202 /* The die_type call above may have already set the type for this DIE. */
17203 cv_type = get_die_type (die, cu);
17207 /* In case the const qualifier is applied to an array type, the element type
17208 is so qualified, not the array type (section 6.7.3 of C99). */
17209 if (TYPE_CODE (base_type) == TYPE_CODE_ARRAY)
17210 return add_array_cv_type (die, cu, base_type, 1, 0);
17212 cv_type = make_cv_type (1, TYPE_VOLATILE (base_type), base_type, 0);
17213 return set_die_type (die, cv_type, cu);
17216 static struct type *
17217 read_tag_volatile_type (struct die_info *die, struct dwarf2_cu *cu)
17219 struct type *base_type, *cv_type;
17221 base_type = die_type (die, cu);
17223 /* The die_type call above may have already set the type for this DIE. */
17224 cv_type = get_die_type (die, cu);
17228 /* In case the volatile qualifier is applied to an array type, the
17229 element type is so qualified, not the array type (section 6.7.3
17231 if (TYPE_CODE (base_type) == TYPE_CODE_ARRAY)
17232 return add_array_cv_type (die, cu, base_type, 0, 1);
17234 cv_type = make_cv_type (TYPE_CONST (base_type), 1, base_type, 0);
17235 return set_die_type (die, cv_type, cu);
17238 /* Handle DW_TAG_restrict_type. */
17240 static struct type *
17241 read_tag_restrict_type (struct die_info *die, struct dwarf2_cu *cu)
17243 struct type *base_type, *cv_type;
17245 base_type = die_type (die, cu);
17247 /* The die_type call above may have already set the type for this DIE. */
17248 cv_type = get_die_type (die, cu);
17252 cv_type = make_restrict_type (base_type);
17253 return set_die_type (die, cv_type, cu);
17256 /* Handle DW_TAG_atomic_type. */
17258 static struct type *
17259 read_tag_atomic_type (struct die_info *die, struct dwarf2_cu *cu)
17261 struct type *base_type, *cv_type;
17263 base_type = die_type (die, cu);
17265 /* The die_type call above may have already set the type for this DIE. */
17266 cv_type = get_die_type (die, cu);
17270 cv_type = make_atomic_type (base_type);
17271 return set_die_type (die, cv_type, cu);
17274 /* Extract all information from a DW_TAG_string_type DIE and add to
17275 the user defined type vector. It isn't really a user defined type,
17276 but it behaves like one, with other DIE's using an AT_user_def_type
17277 attribute to reference it. */
17279 static struct type *
17280 read_tag_string_type (struct die_info *die, struct dwarf2_cu *cu)
17282 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
17283 struct gdbarch *gdbarch = get_objfile_arch (objfile);
17284 struct type *type, *range_type, *index_type, *char_type;
17285 struct attribute *attr;
17286 unsigned int length;
17288 attr = dwarf2_attr (die, DW_AT_string_length, cu);
17291 length = DW_UNSND (attr);
17295 /* Check for the DW_AT_byte_size attribute. */
17296 attr = dwarf2_attr (die, DW_AT_byte_size, cu);
17299 length = DW_UNSND (attr);
17307 index_type = objfile_type (objfile)->builtin_int;
17308 range_type = create_static_range_type (NULL, index_type, 1, length);
17309 char_type = language_string_char_type (cu->language_defn, gdbarch);
17310 type = create_string_type (NULL, char_type, range_type);
17312 return set_die_type (die, type, cu);
17315 /* Assuming that DIE corresponds to a function, returns nonzero
17316 if the function is prototyped. */
17319 prototyped_function_p (struct die_info *die, struct dwarf2_cu *cu)
17321 struct attribute *attr;
17323 attr = dwarf2_attr (die, DW_AT_prototyped, cu);
17324 if (attr && (DW_UNSND (attr) != 0))
17327 /* The DWARF standard implies that the DW_AT_prototyped attribute
17328 is only meaninful for C, but the concept also extends to other
17329 languages that allow unprototyped functions (Eg: Objective C).
17330 For all other languages, assume that functions are always
17332 if (cu->language != language_c
17333 && cu->language != language_objc
17334 && cu->language != language_opencl)
17337 /* RealView does not emit DW_AT_prototyped. We can not distinguish
17338 prototyped and unprototyped functions; default to prototyped,
17339 since that is more common in modern code (and RealView warns
17340 about unprototyped functions). */
17341 if (producer_is_realview (cu->producer))
17347 /* Handle DIES due to C code like:
17351 int (*funcp)(int a, long l);
17355 ('funcp' generates a DW_TAG_subroutine_type DIE). */
17357 static struct type *
17358 read_subroutine_type (struct die_info *die, struct dwarf2_cu *cu)
17360 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
17361 struct type *type; /* Type that this function returns. */
17362 struct type *ftype; /* Function that returns above type. */
17363 struct attribute *attr;
17365 type = die_type (die, cu);
17367 /* The die_type call above may have already set the type for this DIE. */
17368 ftype = get_die_type (die, cu);
17372 ftype = lookup_function_type (type);
17374 if (prototyped_function_p (die, cu))
17375 TYPE_PROTOTYPED (ftype) = 1;
17377 /* Store the calling convention in the type if it's available in
17378 the subroutine die. Otherwise set the calling convention to
17379 the default value DW_CC_normal. */
17380 attr = dwarf2_attr (die, DW_AT_calling_convention, cu);
17382 TYPE_CALLING_CONVENTION (ftype) = DW_UNSND (attr);
17383 else if (cu->producer && strstr (cu->producer, "IBM XL C for OpenCL"))
17384 TYPE_CALLING_CONVENTION (ftype) = DW_CC_GDB_IBM_OpenCL;
17386 TYPE_CALLING_CONVENTION (ftype) = DW_CC_normal;
17388 /* Record whether the function returns normally to its caller or not
17389 if the DWARF producer set that information. */
17390 attr = dwarf2_attr (die, DW_AT_noreturn, cu);
17391 if (attr && (DW_UNSND (attr) != 0))
17392 TYPE_NO_RETURN (ftype) = 1;
17394 /* We need to add the subroutine type to the die immediately so
17395 we don't infinitely recurse when dealing with parameters
17396 declared as the same subroutine type. */
17397 set_die_type (die, ftype, cu);
17399 if (die->child != NULL)
17401 struct type *void_type = objfile_type (objfile)->builtin_void;
17402 struct die_info *child_die;
17403 int nparams, iparams;
17405 /* Count the number of parameters.
17406 FIXME: GDB currently ignores vararg functions, but knows about
17407 vararg member functions. */
17409 child_die = die->child;
17410 while (child_die && child_die->tag)
17412 if (child_die->tag == DW_TAG_formal_parameter)
17414 else if (child_die->tag == DW_TAG_unspecified_parameters)
17415 TYPE_VARARGS (ftype) = 1;
17416 child_die = sibling_die (child_die);
17419 /* Allocate storage for parameters and fill them in. */
17420 TYPE_NFIELDS (ftype) = nparams;
17421 TYPE_FIELDS (ftype) = (struct field *)
17422 TYPE_ZALLOC (ftype, nparams * sizeof (struct field));
17424 /* TYPE_FIELD_TYPE must never be NULL. Pre-fill the array to ensure it
17425 even if we error out during the parameters reading below. */
17426 for (iparams = 0; iparams < nparams; iparams++)
17427 TYPE_FIELD_TYPE (ftype, iparams) = void_type;
17430 child_die = die->child;
17431 while (child_die && child_die->tag)
17433 if (child_die->tag == DW_TAG_formal_parameter)
17435 struct type *arg_type;
17437 /* DWARF version 2 has no clean way to discern C++
17438 static and non-static member functions. G++ helps
17439 GDB by marking the first parameter for non-static
17440 member functions (which is the this pointer) as
17441 artificial. We pass this information to
17442 dwarf2_add_member_fn via TYPE_FIELD_ARTIFICIAL.
17444 DWARF version 3 added DW_AT_object_pointer, which GCC
17445 4.5 does not yet generate. */
17446 attr = dwarf2_attr (child_die, DW_AT_artificial, cu);
17448 TYPE_FIELD_ARTIFICIAL (ftype, iparams) = DW_UNSND (attr);
17450 TYPE_FIELD_ARTIFICIAL (ftype, iparams) = 0;
17451 arg_type = die_type (child_die, cu);
17453 /* RealView does not mark THIS as const, which the testsuite
17454 expects. GCC marks THIS as const in method definitions,
17455 but not in the class specifications (GCC PR 43053). */
17456 if (cu->language == language_cplus && !TYPE_CONST (arg_type)
17457 && TYPE_FIELD_ARTIFICIAL (ftype, iparams))
17460 struct dwarf2_cu *arg_cu = cu;
17461 const char *name = dwarf2_name (child_die, cu);
17463 attr = dwarf2_attr (die, DW_AT_object_pointer, cu);
17466 /* If the compiler emits this, use it. */
17467 if (follow_die_ref (die, attr, &arg_cu) == child_die)
17470 else if (name && strcmp (name, "this") == 0)
17471 /* Function definitions will have the argument names. */
17473 else if (name == NULL && iparams == 0)
17474 /* Declarations may not have the names, so like
17475 elsewhere in GDB, assume an artificial first
17476 argument is "this". */
17480 arg_type = make_cv_type (1, TYPE_VOLATILE (arg_type),
17484 TYPE_FIELD_TYPE (ftype, iparams) = arg_type;
17487 child_die = sibling_die (child_die);
17494 static struct type *
17495 read_typedef (struct die_info *die, struct dwarf2_cu *cu)
17497 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
17498 const char *name = NULL;
17499 struct type *this_type, *target_type;
17501 name = dwarf2_full_name (NULL, die, cu);
17502 this_type = init_type (objfile, TYPE_CODE_TYPEDEF, 0, name);
17503 TYPE_TARGET_STUB (this_type) = 1;
17504 set_die_type (die, this_type, cu);
17505 target_type = die_type (die, cu);
17506 if (target_type != this_type)
17507 TYPE_TARGET_TYPE (this_type) = target_type;
17510 /* Self-referential typedefs are, it seems, not allowed by the DWARF
17511 spec and cause infinite loops in GDB. */
17512 complaint (_("Self-referential DW_TAG_typedef "
17513 "- DIE at %s [in module %s]"),
17514 sect_offset_str (die->sect_off), objfile_name (objfile));
17515 TYPE_TARGET_TYPE (this_type) = NULL;
17520 /* Allocate a floating-point type of size BITS and name NAME. Pass NAME_HINT
17521 (which may be different from NAME) to the architecture back-end to allow
17522 it to guess the correct format if necessary. */
17524 static struct type *
17525 dwarf2_init_float_type (struct objfile *objfile, int bits, const char *name,
17526 const char *name_hint)
17528 struct gdbarch *gdbarch = get_objfile_arch (objfile);
17529 const struct floatformat **format;
17532 format = gdbarch_floatformat_for_type (gdbarch, name_hint, bits);
17534 type = init_float_type (objfile, bits, name, format);
17536 type = init_type (objfile, TYPE_CODE_ERROR, bits, name);
17541 /* Allocate an integer type of size BITS and name NAME. */
17543 static struct type *
17544 dwarf2_init_integer_type (struct dwarf2_cu *cu, struct objfile *objfile,
17545 int bits, int unsigned_p, const char *name)
17549 /* Versions of Intel's C Compiler generate an integer type called "void"
17550 instead of using DW_TAG_unspecified_type. This has been seen on
17551 at least versions 14, 17, and 18. */
17552 if (bits == 0 && producer_is_icc (cu) && name != nullptr
17553 && strcmp (name, "void") == 0)
17554 type = objfile_type (objfile)->builtin_void;
17556 type = init_integer_type (objfile, bits, unsigned_p, name);
17561 /* Initialise and return a floating point type of size BITS suitable for
17562 use as a component of a complex number. The NAME_HINT is passed through
17563 when initialising the floating point type and is the name of the complex
17566 As DWARF doesn't currently provide an explicit name for the components
17567 of a complex number, but it can be helpful to have these components
17568 named, we try to select a suitable name based on the size of the
17570 static struct type *
17571 dwarf2_init_complex_target_type (struct dwarf2_cu *cu,
17572 struct objfile *objfile,
17573 int bits, const char *name_hint)
17575 gdbarch *gdbarch = get_objfile_arch (objfile);
17576 struct type *tt = nullptr;
17578 /* Try to find a suitable floating point builtin type of size BITS.
17579 We're going to use the name of this type as the name for the complex
17580 target type that we are about to create. */
17581 switch (cu->language)
17583 case language_fortran:
17587 tt = builtin_f_type (gdbarch)->builtin_real;
17590 tt = builtin_f_type (gdbarch)->builtin_real_s8;
17592 case 96: /* The x86-32 ABI specifies 96-bit long double. */
17594 tt = builtin_f_type (gdbarch)->builtin_real_s16;
17602 tt = builtin_type (gdbarch)->builtin_float;
17605 tt = builtin_type (gdbarch)->builtin_double;
17607 case 96: /* The x86-32 ABI specifies 96-bit long double. */
17609 tt = builtin_type (gdbarch)->builtin_long_double;
17615 /* If the type we found doesn't match the size we were looking for, then
17616 pretend we didn't find a type at all, the complex target type we
17617 create will then be nameless. */
17618 if (tt != nullptr && TYPE_LENGTH (tt) * TARGET_CHAR_BIT != bits)
17621 const char *name = (tt == nullptr) ? nullptr : TYPE_NAME (tt);
17622 return dwarf2_init_float_type (objfile, bits, name, name_hint);
17625 /* Find a representation of a given base type and install
17626 it in the TYPE field of the die. */
17628 static struct type *
17629 read_base_type (struct die_info *die, struct dwarf2_cu *cu)
17631 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
17633 struct attribute *attr;
17634 int encoding = 0, bits = 0;
17637 attr = dwarf2_attr (die, DW_AT_encoding, cu);
17640 encoding = DW_UNSND (attr);
17642 attr = dwarf2_attr (die, DW_AT_byte_size, cu);
17645 bits = DW_UNSND (attr) * TARGET_CHAR_BIT;
17647 name = dwarf2_name (die, cu);
17650 complaint (_("DW_AT_name missing from DW_TAG_base_type"));
17655 case DW_ATE_address:
17656 /* Turn DW_ATE_address into a void * pointer. */
17657 type = init_type (objfile, TYPE_CODE_VOID, TARGET_CHAR_BIT, NULL);
17658 type = init_pointer_type (objfile, bits, name, type);
17660 case DW_ATE_boolean:
17661 type = init_boolean_type (objfile, bits, 1, name);
17663 case DW_ATE_complex_float:
17664 type = dwarf2_init_complex_target_type (cu, objfile, bits / 2, name);
17665 type = init_complex_type (objfile, name, type);
17667 case DW_ATE_decimal_float:
17668 type = init_decfloat_type (objfile, bits, name);
17671 type = dwarf2_init_float_type (objfile, bits, name, name);
17673 case DW_ATE_signed:
17674 type = dwarf2_init_integer_type (cu, objfile, bits, 0, name);
17676 case DW_ATE_unsigned:
17677 if (cu->language == language_fortran
17679 && startswith (name, "character("))
17680 type = init_character_type (objfile, bits, 1, name);
17682 type = dwarf2_init_integer_type (cu, objfile, bits, 1, name);
17684 case DW_ATE_signed_char:
17685 if (cu->language == language_ada || cu->language == language_m2
17686 || cu->language == language_pascal
17687 || cu->language == language_fortran)
17688 type = init_character_type (objfile, bits, 0, name);
17690 type = dwarf2_init_integer_type (cu, objfile, bits, 0, name);
17692 case DW_ATE_unsigned_char:
17693 if (cu->language == language_ada || cu->language == language_m2
17694 || cu->language == language_pascal
17695 || cu->language == language_fortran
17696 || cu->language == language_rust)
17697 type = init_character_type (objfile, bits, 1, name);
17699 type = dwarf2_init_integer_type (cu, objfile, bits, 1, name);
17703 gdbarch *arch = get_objfile_arch (objfile);
17706 type = builtin_type (arch)->builtin_char16;
17707 else if (bits == 32)
17708 type = builtin_type (arch)->builtin_char32;
17711 complaint (_("unsupported DW_ATE_UTF bit size: '%d'"),
17713 type = dwarf2_init_integer_type (cu, objfile, bits, 1, name);
17715 return set_die_type (die, type, cu);
17720 complaint (_("unsupported DW_AT_encoding: '%s'"),
17721 dwarf_type_encoding_name (encoding));
17722 type = init_type (objfile, TYPE_CODE_ERROR, bits, name);
17726 if (name && strcmp (name, "char") == 0)
17727 TYPE_NOSIGN (type) = 1;
17729 maybe_set_alignment (cu, die, type);
17731 return set_die_type (die, type, cu);
17734 /* Parse dwarf attribute if it's a block, reference or constant and put the
17735 resulting value of the attribute into struct bound_prop.
17736 Returns 1 if ATTR could be resolved into PROP, 0 otherwise. */
17739 attr_to_dynamic_prop (const struct attribute *attr, struct die_info *die,
17740 struct dwarf2_cu *cu, struct dynamic_prop *prop)
17742 struct dwarf2_property_baton *baton;
17743 struct obstack *obstack
17744 = &cu->per_cu->dwarf2_per_objfile->objfile->objfile_obstack;
17746 if (attr == NULL || prop == NULL)
17749 if (attr_form_is_block (attr))
17751 baton = XOBNEW (obstack, struct dwarf2_property_baton);
17752 baton->referenced_type = NULL;
17753 baton->locexpr.per_cu = cu->per_cu;
17754 baton->locexpr.size = DW_BLOCK (attr)->size;
17755 baton->locexpr.data = DW_BLOCK (attr)->data;
17756 prop->data.baton = baton;
17757 prop->kind = PROP_LOCEXPR;
17758 gdb_assert (prop->data.baton != NULL);
17760 else if (attr_form_is_ref (attr))
17762 struct dwarf2_cu *target_cu = cu;
17763 struct die_info *target_die;
17764 struct attribute *target_attr;
17766 target_die = follow_die_ref (die, attr, &target_cu);
17767 target_attr = dwarf2_attr (target_die, DW_AT_location, target_cu);
17768 if (target_attr == NULL)
17769 target_attr = dwarf2_attr (target_die, DW_AT_data_member_location,
17771 if (target_attr == NULL)
17774 switch (target_attr->name)
17776 case DW_AT_location:
17777 if (attr_form_is_section_offset (target_attr))
17779 baton = XOBNEW (obstack, struct dwarf2_property_baton);
17780 baton->referenced_type = die_type (target_die, target_cu);
17781 fill_in_loclist_baton (cu, &baton->loclist, target_attr);
17782 prop->data.baton = baton;
17783 prop->kind = PROP_LOCLIST;
17784 gdb_assert (prop->data.baton != NULL);
17786 else if (attr_form_is_block (target_attr))
17788 baton = XOBNEW (obstack, struct dwarf2_property_baton);
17789 baton->referenced_type = die_type (target_die, target_cu);
17790 baton->locexpr.per_cu = cu->per_cu;
17791 baton->locexpr.size = DW_BLOCK (target_attr)->size;
17792 baton->locexpr.data = DW_BLOCK (target_attr)->data;
17793 prop->data.baton = baton;
17794 prop->kind = PROP_LOCEXPR;
17795 gdb_assert (prop->data.baton != NULL);
17799 dwarf2_invalid_attrib_class_complaint ("DW_AT_location",
17800 "dynamic property");
17804 case DW_AT_data_member_location:
17808 if (!handle_data_member_location (target_die, target_cu,
17812 baton = XOBNEW (obstack, struct dwarf2_property_baton);
17813 baton->referenced_type = read_type_die (target_die->parent,
17815 baton->offset_info.offset = offset;
17816 baton->offset_info.type = die_type (target_die, target_cu);
17817 prop->data.baton = baton;
17818 prop->kind = PROP_ADDR_OFFSET;
17823 else if (attr_form_is_constant (attr))
17825 prop->data.const_val = dwarf2_get_attr_constant_value (attr, 0);
17826 prop->kind = PROP_CONST;
17830 dwarf2_invalid_attrib_class_complaint (dwarf_form_name (attr->form),
17831 dwarf2_name (die, cu));
17838 /* Read the given DW_AT_subrange DIE. */
17840 static struct type *
17841 read_subrange_type (struct die_info *die, struct dwarf2_cu *cu)
17843 struct type *base_type, *orig_base_type;
17844 struct type *range_type;
17845 struct attribute *attr;
17846 struct dynamic_prop low, high;
17847 int low_default_is_valid;
17848 int high_bound_is_count = 0;
17850 ULONGEST negative_mask;
17852 orig_base_type = die_type (die, cu);
17853 /* If ORIG_BASE_TYPE is a typedef, it will not be TYPE_UNSIGNED,
17854 whereas the real type might be. So, we use ORIG_BASE_TYPE when
17855 creating the range type, but we use the result of check_typedef
17856 when examining properties of the type. */
17857 base_type = check_typedef (orig_base_type);
17859 /* The die_type call above may have already set the type for this DIE. */
17860 range_type = get_die_type (die, cu);
17864 low.kind = PROP_CONST;
17865 high.kind = PROP_CONST;
17866 high.data.const_val = 0;
17868 /* Set LOW_DEFAULT_IS_VALID if current language and DWARF version allow
17869 omitting DW_AT_lower_bound. */
17870 switch (cu->language)
17873 case language_cplus:
17874 low.data.const_val = 0;
17875 low_default_is_valid = 1;
17877 case language_fortran:
17878 low.data.const_val = 1;
17879 low_default_is_valid = 1;
17882 case language_objc:
17883 case language_rust:
17884 low.data.const_val = 0;
17885 low_default_is_valid = (cu->header.version >= 4);
17889 case language_pascal:
17890 low.data.const_val = 1;
17891 low_default_is_valid = (cu->header.version >= 4);
17894 low.data.const_val = 0;
17895 low_default_is_valid = 0;
17899 attr = dwarf2_attr (die, DW_AT_lower_bound, cu);
17901 attr_to_dynamic_prop (attr, die, cu, &low);
17902 else if (!low_default_is_valid)
17903 complaint (_("Missing DW_AT_lower_bound "
17904 "- DIE at %s [in module %s]"),
17905 sect_offset_str (die->sect_off),
17906 objfile_name (cu->per_cu->dwarf2_per_objfile->objfile));
17908 struct attribute *attr_ub, *attr_count;
17909 attr = attr_ub = dwarf2_attr (die, DW_AT_upper_bound, cu);
17910 if (!attr_to_dynamic_prop (attr, die, cu, &high))
17912 attr = attr_count = dwarf2_attr (die, DW_AT_count, cu);
17913 if (attr_to_dynamic_prop (attr, die, cu, &high))
17915 /* If bounds are constant do the final calculation here. */
17916 if (low.kind == PROP_CONST && high.kind == PROP_CONST)
17917 high.data.const_val = low.data.const_val + high.data.const_val - 1;
17919 high_bound_is_count = 1;
17923 if (attr_ub != NULL)
17924 complaint (_("Unresolved DW_AT_upper_bound "
17925 "- DIE at %s [in module %s]"),
17926 sect_offset_str (die->sect_off),
17927 objfile_name (cu->per_cu->dwarf2_per_objfile->objfile));
17928 if (attr_count != NULL)
17929 complaint (_("Unresolved DW_AT_count "
17930 "- DIE at %s [in module %s]"),
17931 sect_offset_str (die->sect_off),
17932 objfile_name (cu->per_cu->dwarf2_per_objfile->objfile));
17937 /* Dwarf-2 specifications explicitly allows to create subrange types
17938 without specifying a base type.
17939 In that case, the base type must be set to the type of
17940 the lower bound, upper bound or count, in that order, if any of these
17941 three attributes references an object that has a type.
17942 If no base type is found, the Dwarf-2 specifications say that
17943 a signed integer type of size equal to the size of an address should
17945 For the following C code: `extern char gdb_int [];'
17946 GCC produces an empty range DIE.
17947 FIXME: muller/2010-05-28: Possible references to object for low bound,
17948 high bound or count are not yet handled by this code. */
17949 if (TYPE_CODE (base_type) == TYPE_CODE_VOID)
17951 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
17952 struct gdbarch *gdbarch = get_objfile_arch (objfile);
17953 int addr_size = gdbarch_addr_bit (gdbarch) /8;
17954 struct type *int_type = objfile_type (objfile)->builtin_int;
17956 /* Test "int", "long int", and "long long int" objfile types,
17957 and select the first one having a size above or equal to the
17958 architecture address size. */
17959 if (int_type && TYPE_LENGTH (int_type) >= addr_size)
17960 base_type = int_type;
17963 int_type = objfile_type (objfile)->builtin_long;
17964 if (int_type && TYPE_LENGTH (int_type) >= addr_size)
17965 base_type = int_type;
17968 int_type = objfile_type (objfile)->builtin_long_long;
17969 if (int_type && TYPE_LENGTH (int_type) >= addr_size)
17970 base_type = int_type;
17975 /* Normally, the DWARF producers are expected to use a signed
17976 constant form (Eg. DW_FORM_sdata) to express negative bounds.
17977 But this is unfortunately not always the case, as witnessed
17978 with GCC, for instance, where the ambiguous DW_FORM_dataN form
17979 is used instead. To work around that ambiguity, we treat
17980 the bounds as signed, and thus sign-extend their values, when
17981 the base type is signed. */
17983 -((ULONGEST) 1 << (TYPE_LENGTH (base_type) * TARGET_CHAR_BIT - 1));
17984 if (low.kind == PROP_CONST
17985 && !TYPE_UNSIGNED (base_type) && (low.data.const_val & negative_mask))
17986 low.data.const_val |= negative_mask;
17987 if (high.kind == PROP_CONST
17988 && !TYPE_UNSIGNED (base_type) && (high.data.const_val & negative_mask))
17989 high.data.const_val |= negative_mask;
17991 range_type = create_range_type (NULL, orig_base_type, &low, &high);
17993 if (high_bound_is_count)
17994 TYPE_RANGE_DATA (range_type)->flag_upper_bound_is_count = 1;
17996 /* Ada expects an empty array on no boundary attributes. */
17997 if (attr == NULL && cu->language != language_ada)
17998 TYPE_HIGH_BOUND_KIND (range_type) = PROP_UNDEFINED;
18000 name = dwarf2_name (die, cu);
18002 TYPE_NAME (range_type) = name;
18004 attr = dwarf2_attr (die, DW_AT_byte_size, cu);
18006 TYPE_LENGTH (range_type) = DW_UNSND (attr);
18008 maybe_set_alignment (cu, die, range_type);
18010 set_die_type (die, range_type, cu);
18012 /* set_die_type should be already done. */
18013 set_descriptive_type (range_type, die, cu);
18018 static struct type *
18019 read_unspecified_type (struct die_info *die, struct dwarf2_cu *cu)
18023 type = init_type (cu->per_cu->dwarf2_per_objfile->objfile, TYPE_CODE_VOID,0,
18025 TYPE_NAME (type) = dwarf2_name (die, cu);
18027 /* In Ada, an unspecified type is typically used when the description
18028 of the type is defered to a different unit. When encountering
18029 such a type, we treat it as a stub, and try to resolve it later on,
18031 if (cu->language == language_ada)
18032 TYPE_STUB (type) = 1;
18034 return set_die_type (die, type, cu);
18037 /* Read a single die and all its descendents. Set the die's sibling
18038 field to NULL; set other fields in the die correctly, and set all
18039 of the descendents' fields correctly. Set *NEW_INFO_PTR to the
18040 location of the info_ptr after reading all of those dies. PARENT
18041 is the parent of the die in question. */
18043 static struct die_info *
18044 read_die_and_children (const struct die_reader_specs *reader,
18045 const gdb_byte *info_ptr,
18046 const gdb_byte **new_info_ptr,
18047 struct die_info *parent)
18049 struct die_info *die;
18050 const gdb_byte *cur_ptr;
18053 cur_ptr = read_full_die_1 (reader, &die, info_ptr, &has_children, 0);
18056 *new_info_ptr = cur_ptr;
18059 store_in_ref_table (die, reader->cu);
18062 die->child = read_die_and_siblings_1 (reader, cur_ptr, new_info_ptr, die);
18066 *new_info_ptr = cur_ptr;
18069 die->sibling = NULL;
18070 die->parent = parent;
18074 /* Read a die, all of its descendents, and all of its siblings; set
18075 all of the fields of all of the dies correctly. Arguments are as
18076 in read_die_and_children. */
18078 static struct die_info *
18079 read_die_and_siblings_1 (const struct die_reader_specs *reader,
18080 const gdb_byte *info_ptr,
18081 const gdb_byte **new_info_ptr,
18082 struct die_info *parent)
18084 struct die_info *first_die, *last_sibling;
18085 const gdb_byte *cur_ptr;
18087 cur_ptr = info_ptr;
18088 first_die = last_sibling = NULL;
18092 struct die_info *die
18093 = read_die_and_children (reader, cur_ptr, &cur_ptr, parent);
18097 *new_info_ptr = cur_ptr;
18104 last_sibling->sibling = die;
18106 last_sibling = die;
18110 /* Read a die, all of its descendents, and all of its siblings; set
18111 all of the fields of all of the dies correctly. Arguments are as
18112 in read_die_and_children.
18113 This the main entry point for reading a DIE and all its children. */
18115 static struct die_info *
18116 read_die_and_siblings (const struct die_reader_specs *reader,
18117 const gdb_byte *info_ptr,
18118 const gdb_byte **new_info_ptr,
18119 struct die_info *parent)
18121 struct die_info *die = read_die_and_siblings_1 (reader, info_ptr,
18122 new_info_ptr, parent);
18124 if (dwarf_die_debug)
18126 fprintf_unfiltered (gdb_stdlog,
18127 "Read die from %s@0x%x of %s:\n",
18128 get_section_name (reader->die_section),
18129 (unsigned) (info_ptr - reader->die_section->buffer),
18130 bfd_get_filename (reader->abfd));
18131 dump_die (die, dwarf_die_debug);
18137 /* Read a die and all its attributes, leave space for NUM_EXTRA_ATTRS
18139 The caller is responsible for filling in the extra attributes
18140 and updating (*DIEP)->num_attrs.
18141 Set DIEP to point to a newly allocated die with its information,
18142 except for its child, sibling, and parent fields.
18143 Set HAS_CHILDREN to tell whether the die has children or not. */
18145 static const gdb_byte *
18146 read_full_die_1 (const struct die_reader_specs *reader,
18147 struct die_info **diep, const gdb_byte *info_ptr,
18148 int *has_children, int num_extra_attrs)
18150 unsigned int abbrev_number, bytes_read, i;
18151 struct abbrev_info *abbrev;
18152 struct die_info *die;
18153 struct dwarf2_cu *cu = reader->cu;
18154 bfd *abfd = reader->abfd;
18156 sect_offset sect_off = (sect_offset) (info_ptr - reader->buffer);
18157 abbrev_number = read_unsigned_leb128 (abfd, info_ptr, &bytes_read);
18158 info_ptr += bytes_read;
18159 if (!abbrev_number)
18166 abbrev = reader->abbrev_table->lookup_abbrev (abbrev_number);
18168 error (_("Dwarf Error: could not find abbrev number %d [in module %s]"),
18170 bfd_get_filename (abfd));
18172 die = dwarf_alloc_die (cu, abbrev->num_attrs + num_extra_attrs);
18173 die->sect_off = sect_off;
18174 die->tag = abbrev->tag;
18175 die->abbrev = abbrev_number;
18177 /* Make the result usable.
18178 The caller needs to update num_attrs after adding the extra
18180 die->num_attrs = abbrev->num_attrs;
18182 for (i = 0; i < abbrev->num_attrs; ++i)
18183 info_ptr = read_attribute (reader, &die->attrs[i], &abbrev->attrs[i],
18187 *has_children = abbrev->has_children;
18191 /* Read a die and all its attributes.
18192 Set DIEP to point to a newly allocated die with its information,
18193 except for its child, sibling, and parent fields.
18194 Set HAS_CHILDREN to tell whether the die has children or not. */
18196 static const gdb_byte *
18197 read_full_die (const struct die_reader_specs *reader,
18198 struct die_info **diep, const gdb_byte *info_ptr,
18201 const gdb_byte *result;
18203 result = read_full_die_1 (reader, diep, info_ptr, has_children, 0);
18205 if (dwarf_die_debug)
18207 fprintf_unfiltered (gdb_stdlog,
18208 "Read die from %s@0x%x of %s:\n",
18209 get_section_name (reader->die_section),
18210 (unsigned) (info_ptr - reader->die_section->buffer),
18211 bfd_get_filename (reader->abfd));
18212 dump_die (*diep, dwarf_die_debug);
18218 /* Abbreviation tables.
18220 In DWARF version 2, the description of the debugging information is
18221 stored in a separate .debug_abbrev section. Before we read any
18222 dies from a section we read in all abbreviations and install them
18223 in a hash table. */
18225 /* Allocate space for a struct abbrev_info object in ABBREV_TABLE. */
18227 struct abbrev_info *
18228 abbrev_table::alloc_abbrev ()
18230 struct abbrev_info *abbrev;
18232 abbrev = XOBNEW (&abbrev_obstack, struct abbrev_info);
18233 memset (abbrev, 0, sizeof (struct abbrev_info));
18238 /* Add an abbreviation to the table. */
18241 abbrev_table::add_abbrev (unsigned int abbrev_number,
18242 struct abbrev_info *abbrev)
18244 unsigned int hash_number;
18246 hash_number = abbrev_number % ABBREV_HASH_SIZE;
18247 abbrev->next = m_abbrevs[hash_number];
18248 m_abbrevs[hash_number] = abbrev;
18251 /* Look up an abbrev in the table.
18252 Returns NULL if the abbrev is not found. */
18254 struct abbrev_info *
18255 abbrev_table::lookup_abbrev (unsigned int abbrev_number)
18257 unsigned int hash_number;
18258 struct abbrev_info *abbrev;
18260 hash_number = abbrev_number % ABBREV_HASH_SIZE;
18261 abbrev = m_abbrevs[hash_number];
18265 if (abbrev->number == abbrev_number)
18267 abbrev = abbrev->next;
18272 /* Read in an abbrev table. */
18274 static abbrev_table_up
18275 abbrev_table_read_table (struct dwarf2_per_objfile *dwarf2_per_objfile,
18276 struct dwarf2_section_info *section,
18277 sect_offset sect_off)
18279 struct objfile *objfile = dwarf2_per_objfile->objfile;
18280 bfd *abfd = get_section_bfd_owner (section);
18281 const gdb_byte *abbrev_ptr;
18282 struct abbrev_info *cur_abbrev;
18283 unsigned int abbrev_number, bytes_read, abbrev_name;
18284 unsigned int abbrev_form;
18285 struct attr_abbrev *cur_attrs;
18286 unsigned int allocated_attrs;
18288 abbrev_table_up abbrev_table (new struct abbrev_table (sect_off));
18290 dwarf2_read_section (objfile, section);
18291 abbrev_ptr = section->buffer + to_underlying (sect_off);
18292 abbrev_number = read_unsigned_leb128 (abfd, abbrev_ptr, &bytes_read);
18293 abbrev_ptr += bytes_read;
18295 allocated_attrs = ATTR_ALLOC_CHUNK;
18296 cur_attrs = XNEWVEC (struct attr_abbrev, allocated_attrs);
18298 /* Loop until we reach an abbrev number of 0. */
18299 while (abbrev_number)
18301 cur_abbrev = abbrev_table->alloc_abbrev ();
18303 /* read in abbrev header */
18304 cur_abbrev->number = abbrev_number;
18306 = (enum dwarf_tag) read_unsigned_leb128 (abfd, abbrev_ptr, &bytes_read);
18307 abbrev_ptr += bytes_read;
18308 cur_abbrev->has_children = read_1_byte (abfd, abbrev_ptr);
18311 /* now read in declarations */
18314 LONGEST implicit_const;
18316 abbrev_name = read_unsigned_leb128 (abfd, abbrev_ptr, &bytes_read);
18317 abbrev_ptr += bytes_read;
18318 abbrev_form = read_unsigned_leb128 (abfd, abbrev_ptr, &bytes_read);
18319 abbrev_ptr += bytes_read;
18320 if (abbrev_form == DW_FORM_implicit_const)
18322 implicit_const = read_signed_leb128 (abfd, abbrev_ptr,
18324 abbrev_ptr += bytes_read;
18328 /* Initialize it due to a false compiler warning. */
18329 implicit_const = -1;
18332 if (abbrev_name == 0)
18335 if (cur_abbrev->num_attrs == allocated_attrs)
18337 allocated_attrs += ATTR_ALLOC_CHUNK;
18339 = XRESIZEVEC (struct attr_abbrev, cur_attrs, allocated_attrs);
18342 cur_attrs[cur_abbrev->num_attrs].name
18343 = (enum dwarf_attribute) abbrev_name;
18344 cur_attrs[cur_abbrev->num_attrs].form
18345 = (enum dwarf_form) abbrev_form;
18346 cur_attrs[cur_abbrev->num_attrs].implicit_const = implicit_const;
18347 ++cur_abbrev->num_attrs;
18350 cur_abbrev->attrs =
18351 XOBNEWVEC (&abbrev_table->abbrev_obstack, struct attr_abbrev,
18352 cur_abbrev->num_attrs);
18353 memcpy (cur_abbrev->attrs, cur_attrs,
18354 cur_abbrev->num_attrs * sizeof (struct attr_abbrev));
18356 abbrev_table->add_abbrev (abbrev_number, cur_abbrev);
18358 /* Get next abbreviation.
18359 Under Irix6 the abbreviations for a compilation unit are not
18360 always properly terminated with an abbrev number of 0.
18361 Exit loop if we encounter an abbreviation which we have
18362 already read (which means we are about to read the abbreviations
18363 for the next compile unit) or if the end of the abbreviation
18364 table is reached. */
18365 if ((unsigned int) (abbrev_ptr - section->buffer) >= section->size)
18367 abbrev_number = read_unsigned_leb128 (abfd, abbrev_ptr, &bytes_read);
18368 abbrev_ptr += bytes_read;
18369 if (abbrev_table->lookup_abbrev (abbrev_number) != NULL)
18374 return abbrev_table;
18377 /* Returns nonzero if TAG represents a type that we might generate a partial
18381 is_type_tag_for_partial (int tag)
18386 /* Some types that would be reasonable to generate partial symbols for,
18387 that we don't at present. */
18388 case DW_TAG_array_type:
18389 case DW_TAG_file_type:
18390 case DW_TAG_ptr_to_member_type:
18391 case DW_TAG_set_type:
18392 case DW_TAG_string_type:
18393 case DW_TAG_subroutine_type:
18395 case DW_TAG_base_type:
18396 case DW_TAG_class_type:
18397 case DW_TAG_interface_type:
18398 case DW_TAG_enumeration_type:
18399 case DW_TAG_structure_type:
18400 case DW_TAG_subrange_type:
18401 case DW_TAG_typedef:
18402 case DW_TAG_union_type:
18409 /* Load all DIEs that are interesting for partial symbols into memory. */
18411 static struct partial_die_info *
18412 load_partial_dies (const struct die_reader_specs *reader,
18413 const gdb_byte *info_ptr, int building_psymtab)
18415 struct dwarf2_cu *cu = reader->cu;
18416 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
18417 struct partial_die_info *parent_die, *last_die, *first_die = NULL;
18418 unsigned int bytes_read;
18419 unsigned int load_all = 0;
18420 int nesting_level = 1;
18425 gdb_assert (cu->per_cu != NULL);
18426 if (cu->per_cu->load_all_dies)
18430 = htab_create_alloc_ex (cu->header.length / 12,
18434 &cu->comp_unit_obstack,
18435 hashtab_obstack_allocate,
18436 dummy_obstack_deallocate);
18440 abbrev_info *abbrev = peek_die_abbrev (*reader, info_ptr, &bytes_read);
18442 /* A NULL abbrev means the end of a series of children. */
18443 if (abbrev == NULL)
18445 if (--nesting_level == 0)
18448 info_ptr += bytes_read;
18449 last_die = parent_die;
18450 parent_die = parent_die->die_parent;
18454 /* Check for template arguments. We never save these; if
18455 they're seen, we just mark the parent, and go on our way. */
18456 if (parent_die != NULL
18457 && cu->language == language_cplus
18458 && (abbrev->tag == DW_TAG_template_type_param
18459 || abbrev->tag == DW_TAG_template_value_param))
18461 parent_die->has_template_arguments = 1;
18465 /* We don't need a partial DIE for the template argument. */
18466 info_ptr = skip_one_die (reader, info_ptr + bytes_read, abbrev);
18471 /* We only recurse into c++ subprograms looking for template arguments.
18472 Skip their other children. */
18474 && cu->language == language_cplus
18475 && parent_die != NULL
18476 && parent_die->tag == DW_TAG_subprogram)
18478 info_ptr = skip_one_die (reader, info_ptr + bytes_read, abbrev);
18482 /* Check whether this DIE is interesting enough to save. Normally
18483 we would not be interested in members here, but there may be
18484 later variables referencing them via DW_AT_specification (for
18485 static members). */
18487 && !is_type_tag_for_partial (abbrev->tag)
18488 && abbrev->tag != DW_TAG_constant
18489 && abbrev->tag != DW_TAG_enumerator
18490 && abbrev->tag != DW_TAG_subprogram
18491 && abbrev->tag != DW_TAG_inlined_subroutine
18492 && abbrev->tag != DW_TAG_lexical_block
18493 && abbrev->tag != DW_TAG_variable
18494 && abbrev->tag != DW_TAG_namespace
18495 && abbrev->tag != DW_TAG_module
18496 && abbrev->tag != DW_TAG_member
18497 && abbrev->tag != DW_TAG_imported_unit
18498 && abbrev->tag != DW_TAG_imported_declaration)
18500 /* Otherwise we skip to the next sibling, if any. */
18501 info_ptr = skip_one_die (reader, info_ptr + bytes_read, abbrev);
18505 struct partial_die_info pdi ((sect_offset) (info_ptr - reader->buffer),
18508 info_ptr = pdi.read (reader, *abbrev, info_ptr + bytes_read);
18510 /* This two-pass algorithm for processing partial symbols has a
18511 high cost in cache pressure. Thus, handle some simple cases
18512 here which cover the majority of C partial symbols. DIEs
18513 which neither have specification tags in them, nor could have
18514 specification tags elsewhere pointing at them, can simply be
18515 processed and discarded.
18517 This segment is also optional; scan_partial_symbols and
18518 add_partial_symbol will handle these DIEs if we chain
18519 them in normally. When compilers which do not emit large
18520 quantities of duplicate debug information are more common,
18521 this code can probably be removed. */
18523 /* Any complete simple types at the top level (pretty much all
18524 of them, for a language without namespaces), can be processed
18526 if (parent_die == NULL
18527 && pdi.has_specification == 0
18528 && pdi.is_declaration == 0
18529 && ((pdi.tag == DW_TAG_typedef && !pdi.has_children)
18530 || pdi.tag == DW_TAG_base_type
18531 || pdi.tag == DW_TAG_subrange_type))
18533 if (building_psymtab && pdi.name != NULL)
18534 add_psymbol_to_list (pdi.name, strlen (pdi.name), 0,
18535 VAR_DOMAIN, LOC_TYPEDEF, -1,
18536 psymbol_placement::STATIC,
18537 0, cu->language, objfile);
18538 info_ptr = locate_pdi_sibling (reader, &pdi, info_ptr);
18542 /* The exception for DW_TAG_typedef with has_children above is
18543 a workaround of GCC PR debug/47510. In the case of this complaint
18544 type_name_or_error will error on such types later.
18546 GDB skipped children of DW_TAG_typedef by the shortcut above and then
18547 it could not find the child DIEs referenced later, this is checked
18548 above. In correct DWARF DW_TAG_typedef should have no children. */
18550 if (pdi.tag == DW_TAG_typedef && pdi.has_children)
18551 complaint (_("DW_TAG_typedef has childen - GCC PR debug/47510 bug "
18552 "- DIE at %s [in module %s]"),
18553 sect_offset_str (pdi.sect_off), objfile_name (objfile));
18555 /* If we're at the second level, and we're an enumerator, and
18556 our parent has no specification (meaning possibly lives in a
18557 namespace elsewhere), then we can add the partial symbol now
18558 instead of queueing it. */
18559 if (pdi.tag == DW_TAG_enumerator
18560 && parent_die != NULL
18561 && parent_die->die_parent == NULL
18562 && parent_die->tag == DW_TAG_enumeration_type
18563 && parent_die->has_specification == 0)
18565 if (pdi.name == NULL)
18566 complaint (_("malformed enumerator DIE ignored"));
18567 else if (building_psymtab)
18568 add_psymbol_to_list (pdi.name, strlen (pdi.name), 0,
18569 VAR_DOMAIN, LOC_CONST, -1,
18570 cu->language == language_cplus
18571 ? psymbol_placement::GLOBAL
18572 : psymbol_placement::STATIC,
18573 0, cu->language, objfile);
18575 info_ptr = locate_pdi_sibling (reader, &pdi, info_ptr);
18579 struct partial_die_info *part_die
18580 = new (&cu->comp_unit_obstack) partial_die_info (pdi);
18582 /* We'll save this DIE so link it in. */
18583 part_die->die_parent = parent_die;
18584 part_die->die_sibling = NULL;
18585 part_die->die_child = NULL;
18587 if (last_die && last_die == parent_die)
18588 last_die->die_child = part_die;
18590 last_die->die_sibling = part_die;
18592 last_die = part_die;
18594 if (first_die == NULL)
18595 first_die = part_die;
18597 /* Maybe add the DIE to the hash table. Not all DIEs that we
18598 find interesting need to be in the hash table, because we
18599 also have the parent/sibling/child chains; only those that we
18600 might refer to by offset later during partial symbol reading.
18602 For now this means things that might have be the target of a
18603 DW_AT_specification, DW_AT_abstract_origin, or
18604 DW_AT_extension. DW_AT_extension will refer only to
18605 namespaces; DW_AT_abstract_origin refers to functions (and
18606 many things under the function DIE, but we do not recurse
18607 into function DIEs during partial symbol reading) and
18608 possibly variables as well; DW_AT_specification refers to
18609 declarations. Declarations ought to have the DW_AT_declaration
18610 flag. It happens that GCC forgets to put it in sometimes, but
18611 only for functions, not for types.
18613 Adding more things than necessary to the hash table is harmless
18614 except for the performance cost. Adding too few will result in
18615 wasted time in find_partial_die, when we reread the compilation
18616 unit with load_all_dies set. */
18619 || abbrev->tag == DW_TAG_constant
18620 || abbrev->tag == DW_TAG_subprogram
18621 || abbrev->tag == DW_TAG_variable
18622 || abbrev->tag == DW_TAG_namespace
18623 || part_die->is_declaration)
18627 slot = htab_find_slot_with_hash (cu->partial_dies, part_die,
18628 to_underlying (part_die->sect_off),
18633 /* For some DIEs we want to follow their children (if any). For C
18634 we have no reason to follow the children of structures; for other
18635 languages we have to, so that we can get at method physnames
18636 to infer fully qualified class names, for DW_AT_specification,
18637 and for C++ template arguments. For C++, we also look one level
18638 inside functions to find template arguments (if the name of the
18639 function does not already contain the template arguments).
18641 For Ada, we need to scan the children of subprograms and lexical
18642 blocks as well because Ada allows the definition of nested
18643 entities that could be interesting for the debugger, such as
18644 nested subprograms for instance. */
18645 if (last_die->has_children
18647 || last_die->tag == DW_TAG_namespace
18648 || last_die->tag == DW_TAG_module
18649 || last_die->tag == DW_TAG_enumeration_type
18650 || (cu->language == language_cplus
18651 && last_die->tag == DW_TAG_subprogram
18652 && (last_die->name == NULL
18653 || strchr (last_die->name, '<') == NULL))
18654 || (cu->language != language_c
18655 && (last_die->tag == DW_TAG_class_type
18656 || last_die->tag == DW_TAG_interface_type
18657 || last_die->tag == DW_TAG_structure_type
18658 || last_die->tag == DW_TAG_union_type))
18659 || (cu->language == language_ada
18660 && (last_die->tag == DW_TAG_subprogram
18661 || last_die->tag == DW_TAG_lexical_block))))
18664 parent_die = last_die;
18668 /* Otherwise we skip to the next sibling, if any. */
18669 info_ptr = locate_pdi_sibling (reader, last_die, info_ptr);
18671 /* Back to the top, do it again. */
18675 partial_die_info::partial_die_info (sect_offset sect_off_,
18676 struct abbrev_info *abbrev)
18677 : partial_die_info (sect_off_, abbrev->tag, abbrev->has_children)
18681 /* Read a minimal amount of information into the minimal die structure.
18682 INFO_PTR should point just after the initial uleb128 of a DIE. */
18685 partial_die_info::read (const struct die_reader_specs *reader,
18686 const struct abbrev_info &abbrev, const gdb_byte *info_ptr)
18688 struct dwarf2_cu *cu = reader->cu;
18689 struct dwarf2_per_objfile *dwarf2_per_objfile
18690 = cu->per_cu->dwarf2_per_objfile;
18692 int has_low_pc_attr = 0;
18693 int has_high_pc_attr = 0;
18694 int high_pc_relative = 0;
18696 for (i = 0; i < abbrev.num_attrs; ++i)
18698 struct attribute attr;
18700 info_ptr = read_attribute (reader, &attr, &abbrev.attrs[i], info_ptr);
18702 /* Store the data if it is of an attribute we want to keep in a
18703 partial symbol table. */
18709 case DW_TAG_compile_unit:
18710 case DW_TAG_partial_unit:
18711 case DW_TAG_type_unit:
18712 /* Compilation units have a DW_AT_name that is a filename, not
18713 a source language identifier. */
18714 case DW_TAG_enumeration_type:
18715 case DW_TAG_enumerator:
18716 /* These tags always have simple identifiers already; no need
18717 to canonicalize them. */
18718 name = DW_STRING (&attr);
18722 struct objfile *objfile = dwarf2_per_objfile->objfile;
18725 = dwarf2_canonicalize_name (DW_STRING (&attr), cu,
18726 &objfile->per_bfd->storage_obstack);
18731 case DW_AT_linkage_name:
18732 case DW_AT_MIPS_linkage_name:
18733 /* Note that both forms of linkage name might appear. We
18734 assume they will be the same, and we only store the last
18736 if (cu->language == language_ada)
18737 name = DW_STRING (&attr);
18738 linkage_name = DW_STRING (&attr);
18741 has_low_pc_attr = 1;
18742 lowpc = attr_value_as_address (&attr);
18744 case DW_AT_high_pc:
18745 has_high_pc_attr = 1;
18746 highpc = attr_value_as_address (&attr);
18747 if (cu->header.version >= 4 && attr_form_is_constant (&attr))
18748 high_pc_relative = 1;
18750 case DW_AT_location:
18751 /* Support the .debug_loc offsets. */
18752 if (attr_form_is_block (&attr))
18754 d.locdesc = DW_BLOCK (&attr);
18756 else if (attr_form_is_section_offset (&attr))
18758 dwarf2_complex_location_expr_complaint ();
18762 dwarf2_invalid_attrib_class_complaint ("DW_AT_location",
18763 "partial symbol information");
18766 case DW_AT_external:
18767 is_external = DW_UNSND (&attr);
18769 case DW_AT_declaration:
18770 is_declaration = DW_UNSND (&attr);
18775 case DW_AT_abstract_origin:
18776 case DW_AT_specification:
18777 case DW_AT_extension:
18778 has_specification = 1;
18779 spec_offset = dwarf2_get_ref_die_offset (&attr);
18780 spec_is_dwz = (attr.form == DW_FORM_GNU_ref_alt
18781 || cu->per_cu->is_dwz);
18783 case DW_AT_sibling:
18784 /* Ignore absolute siblings, they might point outside of
18785 the current compile unit. */
18786 if (attr.form == DW_FORM_ref_addr)
18787 complaint (_("ignoring absolute DW_AT_sibling"));
18790 const gdb_byte *buffer = reader->buffer;
18791 sect_offset off = dwarf2_get_ref_die_offset (&attr);
18792 const gdb_byte *sibling_ptr = buffer + to_underlying (off);
18794 if (sibling_ptr < info_ptr)
18795 complaint (_("DW_AT_sibling points backwards"));
18796 else if (sibling_ptr > reader->buffer_end)
18797 dwarf2_section_buffer_overflow_complaint (reader->die_section);
18799 sibling = sibling_ptr;
18802 case DW_AT_byte_size:
18805 case DW_AT_const_value:
18806 has_const_value = 1;
18808 case DW_AT_calling_convention:
18809 /* DWARF doesn't provide a way to identify a program's source-level
18810 entry point. DW_AT_calling_convention attributes are only meant
18811 to describe functions' calling conventions.
18813 However, because it's a necessary piece of information in
18814 Fortran, and before DWARF 4 DW_CC_program was the only
18815 piece of debugging information whose definition refers to
18816 a 'main program' at all, several compilers marked Fortran
18817 main programs with DW_CC_program --- even when those
18818 functions use the standard calling conventions.
18820 Although DWARF now specifies a way to provide this
18821 information, we support this practice for backward
18823 if (DW_UNSND (&attr) == DW_CC_program
18824 && cu->language == language_fortran)
18825 main_subprogram = 1;
18828 if (DW_UNSND (&attr) == DW_INL_inlined
18829 || DW_UNSND (&attr) == DW_INL_declared_inlined)
18830 may_be_inlined = 1;
18834 if (tag == DW_TAG_imported_unit)
18836 d.sect_off = dwarf2_get_ref_die_offset (&attr);
18837 is_dwz = (attr.form == DW_FORM_GNU_ref_alt
18838 || cu->per_cu->is_dwz);
18842 case DW_AT_main_subprogram:
18843 main_subprogram = DW_UNSND (&attr);
18848 /* It would be nice to reuse dwarf2_get_pc_bounds here,
18849 but that requires a full DIE, so instead we just
18851 int need_ranges_base = tag != DW_TAG_compile_unit;
18852 unsigned int ranges_offset = (DW_UNSND (&attr)
18853 + (need_ranges_base
18857 /* Value of the DW_AT_ranges attribute is the offset in the
18858 .debug_ranges section. */
18859 if (dwarf2_ranges_read (ranges_offset, &lowpc, &highpc, cu,
18870 if (high_pc_relative)
18873 if (has_low_pc_attr && has_high_pc_attr)
18875 /* When using the GNU linker, .gnu.linkonce. sections are used to
18876 eliminate duplicate copies of functions and vtables and such.
18877 The linker will arbitrarily choose one and discard the others.
18878 The AT_*_pc values for such functions refer to local labels in
18879 these sections. If the section from that file was discarded, the
18880 labels are not in the output, so the relocs get a value of 0.
18881 If this is a discarded function, mark the pc bounds as invalid,
18882 so that GDB will ignore it. */
18883 if (lowpc == 0 && !dwarf2_per_objfile->has_section_at_zero)
18885 struct objfile *objfile = dwarf2_per_objfile->objfile;
18886 struct gdbarch *gdbarch = get_objfile_arch (objfile);
18888 complaint (_("DW_AT_low_pc %s is zero "
18889 "for DIE at %s [in module %s]"),
18890 paddress (gdbarch, lowpc),
18891 sect_offset_str (sect_off),
18892 objfile_name (objfile));
18894 /* dwarf2_get_pc_bounds has also the strict low < high requirement. */
18895 else if (lowpc >= highpc)
18897 struct objfile *objfile = dwarf2_per_objfile->objfile;
18898 struct gdbarch *gdbarch = get_objfile_arch (objfile);
18900 complaint (_("DW_AT_low_pc %s is not < DW_AT_high_pc %s "
18901 "for DIE at %s [in module %s]"),
18902 paddress (gdbarch, lowpc),
18903 paddress (gdbarch, highpc),
18904 sect_offset_str (sect_off),
18905 objfile_name (objfile));
18914 /* Find a cached partial DIE at OFFSET in CU. */
18916 struct partial_die_info *
18917 dwarf2_cu::find_partial_die (sect_offset sect_off)
18919 struct partial_die_info *lookup_die = NULL;
18920 struct partial_die_info part_die (sect_off);
18922 lookup_die = ((struct partial_die_info *)
18923 htab_find_with_hash (partial_dies, &part_die,
18924 to_underlying (sect_off)));
18929 /* Find a partial DIE at OFFSET, which may or may not be in CU,
18930 except in the case of .debug_types DIEs which do not reference
18931 outside their CU (they do however referencing other types via
18932 DW_FORM_ref_sig8). */
18934 static const struct cu_partial_die_info
18935 find_partial_die (sect_offset sect_off, int offset_in_dwz, struct dwarf2_cu *cu)
18937 struct dwarf2_per_objfile *dwarf2_per_objfile
18938 = cu->per_cu->dwarf2_per_objfile;
18939 struct objfile *objfile = dwarf2_per_objfile->objfile;
18940 struct dwarf2_per_cu_data *per_cu = NULL;
18941 struct partial_die_info *pd = NULL;
18943 if (offset_in_dwz == cu->per_cu->is_dwz
18944 && offset_in_cu_p (&cu->header, sect_off))
18946 pd = cu->find_partial_die (sect_off);
18949 /* We missed recording what we needed.
18950 Load all dies and try again. */
18951 per_cu = cu->per_cu;
18955 /* TUs don't reference other CUs/TUs (except via type signatures). */
18956 if (cu->per_cu->is_debug_types)
18958 error (_("Dwarf Error: Type Unit at offset %s contains"
18959 " external reference to offset %s [in module %s].\n"),
18960 sect_offset_str (cu->header.sect_off), sect_offset_str (sect_off),
18961 bfd_get_filename (objfile->obfd));
18963 per_cu = dwarf2_find_containing_comp_unit (sect_off, offset_in_dwz,
18964 dwarf2_per_objfile);
18966 if (per_cu->cu == NULL || per_cu->cu->partial_dies == NULL)
18967 load_partial_comp_unit (per_cu);
18969 per_cu->cu->last_used = 0;
18970 pd = per_cu->cu->find_partial_die (sect_off);
18973 /* If we didn't find it, and not all dies have been loaded,
18974 load them all and try again. */
18976 if (pd == NULL && per_cu->load_all_dies == 0)
18978 per_cu->load_all_dies = 1;
18980 /* This is nasty. When we reread the DIEs, somewhere up the call chain
18981 THIS_CU->cu may already be in use. So we can't just free it and
18982 replace its DIEs with the ones we read in. Instead, we leave those
18983 DIEs alone (which can still be in use, e.g. in scan_partial_symbols),
18984 and clobber THIS_CU->cu->partial_dies with the hash table for the new
18986 load_partial_comp_unit (per_cu);
18988 pd = per_cu->cu->find_partial_die (sect_off);
18992 internal_error (__FILE__, __LINE__,
18993 _("could not find partial DIE %s "
18994 "in cache [from module %s]\n"),
18995 sect_offset_str (sect_off), bfd_get_filename (objfile->obfd));
18996 return { per_cu->cu, pd };
18999 /* See if we can figure out if the class lives in a namespace. We do
19000 this by looking for a member function; its demangled name will
19001 contain namespace info, if there is any. */
19004 guess_partial_die_structure_name (struct partial_die_info *struct_pdi,
19005 struct dwarf2_cu *cu)
19007 /* NOTE: carlton/2003-10-07: Getting the info this way changes
19008 what template types look like, because the demangler
19009 frequently doesn't give the same name as the debug info. We
19010 could fix this by only using the demangled name to get the
19011 prefix (but see comment in read_structure_type). */
19013 struct partial_die_info *real_pdi;
19014 struct partial_die_info *child_pdi;
19016 /* If this DIE (this DIE's specification, if any) has a parent, then
19017 we should not do this. We'll prepend the parent's fully qualified
19018 name when we create the partial symbol. */
19020 real_pdi = struct_pdi;
19021 while (real_pdi->has_specification)
19023 auto res = find_partial_die (real_pdi->spec_offset,
19024 real_pdi->spec_is_dwz, cu);
19025 real_pdi = res.pdi;
19029 if (real_pdi->die_parent != NULL)
19032 for (child_pdi = struct_pdi->die_child;
19034 child_pdi = child_pdi->die_sibling)
19036 if (child_pdi->tag == DW_TAG_subprogram
19037 && child_pdi->linkage_name != NULL)
19039 char *actual_class_name
19040 = language_class_name_from_physname (cu->language_defn,
19041 child_pdi->linkage_name);
19042 if (actual_class_name != NULL)
19044 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
19047 obstack_copy0 (&objfile->per_bfd->storage_obstack,
19049 strlen (actual_class_name)));
19050 xfree (actual_class_name);
19058 partial_die_info::fixup (struct dwarf2_cu *cu)
19060 /* Once we've fixed up a die, there's no point in doing so again.
19061 This also avoids a memory leak if we were to call
19062 guess_partial_die_structure_name multiple times. */
19066 /* If we found a reference attribute and the DIE has no name, try
19067 to find a name in the referred to DIE. */
19069 if (name == NULL && has_specification)
19071 struct partial_die_info *spec_die;
19073 auto res = find_partial_die (spec_offset, spec_is_dwz, cu);
19074 spec_die = res.pdi;
19077 spec_die->fixup (cu);
19079 if (spec_die->name)
19081 name = spec_die->name;
19083 /* Copy DW_AT_external attribute if it is set. */
19084 if (spec_die->is_external)
19085 is_external = spec_die->is_external;
19089 /* Set default names for some unnamed DIEs. */
19091 if (name == NULL && tag == DW_TAG_namespace)
19092 name = CP_ANONYMOUS_NAMESPACE_STR;
19094 /* If there is no parent die to provide a namespace, and there are
19095 children, see if we can determine the namespace from their linkage
19097 if (cu->language == language_cplus
19098 && !VEC_empty (dwarf2_section_info_def,
19099 cu->per_cu->dwarf2_per_objfile->types)
19100 && die_parent == NULL
19102 && (tag == DW_TAG_class_type
19103 || tag == DW_TAG_structure_type
19104 || tag == DW_TAG_union_type))
19105 guess_partial_die_structure_name (this, cu);
19107 /* GCC might emit a nameless struct or union that has a linkage
19108 name. See http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47510. */
19110 && (tag == DW_TAG_class_type
19111 || tag == DW_TAG_interface_type
19112 || tag == DW_TAG_structure_type
19113 || tag == DW_TAG_union_type)
19114 && linkage_name != NULL)
19118 demangled = gdb_demangle (linkage_name, DMGL_TYPES);
19123 /* Strip any leading namespaces/classes, keep only the base name.
19124 DW_AT_name for named DIEs does not contain the prefixes. */
19125 base = strrchr (demangled, ':');
19126 if (base && base > demangled && base[-1] == ':')
19131 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
19134 obstack_copy0 (&objfile->per_bfd->storage_obstack,
19135 base, strlen (base)));
19143 /* Read an attribute value described by an attribute form. */
19145 static const gdb_byte *
19146 read_attribute_value (const struct die_reader_specs *reader,
19147 struct attribute *attr, unsigned form,
19148 LONGEST implicit_const, const gdb_byte *info_ptr)
19150 struct dwarf2_cu *cu = reader->cu;
19151 struct dwarf2_per_objfile *dwarf2_per_objfile
19152 = cu->per_cu->dwarf2_per_objfile;
19153 struct objfile *objfile = dwarf2_per_objfile->objfile;
19154 struct gdbarch *gdbarch = get_objfile_arch (objfile);
19155 bfd *abfd = reader->abfd;
19156 struct comp_unit_head *cu_header = &cu->header;
19157 unsigned int bytes_read;
19158 struct dwarf_block *blk;
19160 attr->form = (enum dwarf_form) form;
19163 case DW_FORM_ref_addr:
19164 if (cu->header.version == 2)
19165 DW_UNSND (attr) = read_address (abfd, info_ptr, cu, &bytes_read);
19167 DW_UNSND (attr) = read_offset (abfd, info_ptr,
19168 &cu->header, &bytes_read);
19169 info_ptr += bytes_read;
19171 case DW_FORM_GNU_ref_alt:
19172 DW_UNSND (attr) = read_offset (abfd, info_ptr, &cu->header, &bytes_read);
19173 info_ptr += bytes_read;
19176 DW_ADDR (attr) = read_address (abfd, info_ptr, cu, &bytes_read);
19177 DW_ADDR (attr) = gdbarch_adjust_dwarf2_addr (gdbarch, DW_ADDR (attr));
19178 info_ptr += bytes_read;
19180 case DW_FORM_block2:
19181 blk = dwarf_alloc_block (cu);
19182 blk->size = read_2_bytes (abfd, info_ptr);
19184 blk->data = read_n_bytes (abfd, info_ptr, blk->size);
19185 info_ptr += blk->size;
19186 DW_BLOCK (attr) = blk;
19188 case DW_FORM_block4:
19189 blk = dwarf_alloc_block (cu);
19190 blk->size = read_4_bytes (abfd, info_ptr);
19192 blk->data = read_n_bytes (abfd, info_ptr, blk->size);
19193 info_ptr += blk->size;
19194 DW_BLOCK (attr) = blk;
19196 case DW_FORM_data2:
19197 DW_UNSND (attr) = read_2_bytes (abfd, info_ptr);
19200 case DW_FORM_data4:
19201 DW_UNSND (attr) = read_4_bytes (abfd, info_ptr);
19204 case DW_FORM_data8:
19205 DW_UNSND (attr) = read_8_bytes (abfd, info_ptr);
19208 case DW_FORM_data16:
19209 blk = dwarf_alloc_block (cu);
19211 blk->data = read_n_bytes (abfd, info_ptr, 16);
19213 DW_BLOCK (attr) = blk;
19215 case DW_FORM_sec_offset:
19216 DW_UNSND (attr) = read_offset (abfd, info_ptr, &cu->header, &bytes_read);
19217 info_ptr += bytes_read;
19219 case DW_FORM_string:
19220 DW_STRING (attr) = read_direct_string (abfd, info_ptr, &bytes_read);
19221 DW_STRING_IS_CANONICAL (attr) = 0;
19222 info_ptr += bytes_read;
19225 if (!cu->per_cu->is_dwz)
19227 DW_STRING (attr) = read_indirect_string (dwarf2_per_objfile,
19228 abfd, info_ptr, cu_header,
19230 DW_STRING_IS_CANONICAL (attr) = 0;
19231 info_ptr += bytes_read;
19235 case DW_FORM_line_strp:
19236 if (!cu->per_cu->is_dwz)
19238 DW_STRING (attr) = read_indirect_line_string (dwarf2_per_objfile,
19240 cu_header, &bytes_read);
19241 DW_STRING_IS_CANONICAL (attr) = 0;
19242 info_ptr += bytes_read;
19246 case DW_FORM_GNU_strp_alt:
19248 struct dwz_file *dwz = dwarf2_get_dwz_file (dwarf2_per_objfile);
19249 LONGEST str_offset = read_offset (abfd, info_ptr, cu_header,
19252 DW_STRING (attr) = read_indirect_string_from_dwz (objfile,
19254 DW_STRING_IS_CANONICAL (attr) = 0;
19255 info_ptr += bytes_read;
19258 case DW_FORM_exprloc:
19259 case DW_FORM_block:
19260 blk = dwarf_alloc_block (cu);
19261 blk->size = read_unsigned_leb128 (abfd, info_ptr, &bytes_read);
19262 info_ptr += bytes_read;
19263 blk->data = read_n_bytes (abfd, info_ptr, blk->size);
19264 info_ptr += blk->size;
19265 DW_BLOCK (attr) = blk;
19267 case DW_FORM_block1:
19268 blk = dwarf_alloc_block (cu);
19269 blk->size = read_1_byte (abfd, info_ptr);
19271 blk->data = read_n_bytes (abfd, info_ptr, blk->size);
19272 info_ptr += blk->size;
19273 DW_BLOCK (attr) = blk;
19275 case DW_FORM_data1:
19276 DW_UNSND (attr) = read_1_byte (abfd, info_ptr);
19280 DW_UNSND (attr) = read_1_byte (abfd, info_ptr);
19283 case DW_FORM_flag_present:
19284 DW_UNSND (attr) = 1;
19286 case DW_FORM_sdata:
19287 DW_SND (attr) = read_signed_leb128 (abfd, info_ptr, &bytes_read);
19288 info_ptr += bytes_read;
19290 case DW_FORM_udata:
19291 DW_UNSND (attr) = read_unsigned_leb128 (abfd, info_ptr, &bytes_read);
19292 info_ptr += bytes_read;
19295 DW_UNSND (attr) = (to_underlying (cu->header.sect_off)
19296 + read_1_byte (abfd, info_ptr));
19300 DW_UNSND (attr) = (to_underlying (cu->header.sect_off)
19301 + read_2_bytes (abfd, info_ptr));
19305 DW_UNSND (attr) = (to_underlying (cu->header.sect_off)
19306 + read_4_bytes (abfd, info_ptr));
19310 DW_UNSND (attr) = (to_underlying (cu->header.sect_off)
19311 + read_8_bytes (abfd, info_ptr));
19314 case DW_FORM_ref_sig8:
19315 DW_SIGNATURE (attr) = read_8_bytes (abfd, info_ptr);
19318 case DW_FORM_ref_udata:
19319 DW_UNSND (attr) = (to_underlying (cu->header.sect_off)
19320 + read_unsigned_leb128 (abfd, info_ptr, &bytes_read));
19321 info_ptr += bytes_read;
19323 case DW_FORM_indirect:
19324 form = read_unsigned_leb128 (abfd, info_ptr, &bytes_read);
19325 info_ptr += bytes_read;
19326 if (form == DW_FORM_implicit_const)
19328 implicit_const = read_signed_leb128 (abfd, info_ptr, &bytes_read);
19329 info_ptr += bytes_read;
19331 info_ptr = read_attribute_value (reader, attr, form, implicit_const,
19334 case DW_FORM_implicit_const:
19335 DW_SND (attr) = implicit_const;
19337 case DW_FORM_addrx:
19338 case DW_FORM_GNU_addr_index:
19339 if (reader->dwo_file == NULL)
19341 /* For now flag a hard error.
19342 Later we can turn this into a complaint. */
19343 error (_("Dwarf Error: %s found in non-DWO CU [in module %s]"),
19344 dwarf_form_name (form),
19345 bfd_get_filename (abfd));
19347 DW_ADDR (attr) = read_addr_index_from_leb128 (cu, info_ptr, &bytes_read);
19348 info_ptr += bytes_read;
19351 case DW_FORM_strx1:
19352 case DW_FORM_strx2:
19353 case DW_FORM_strx3:
19354 case DW_FORM_strx4:
19355 case DW_FORM_GNU_str_index:
19356 if (reader->dwo_file == NULL)
19358 /* For now flag a hard error.
19359 Later we can turn this into a complaint if warranted. */
19360 error (_("Dwarf Error: %s found in non-DWO CU [in module %s]"),
19361 dwarf_form_name (form),
19362 bfd_get_filename (abfd));
19365 ULONGEST str_index;
19366 if (form == DW_FORM_strx1)
19368 str_index = read_1_byte (abfd, info_ptr);
19371 else if (form == DW_FORM_strx2)
19373 str_index = read_2_bytes (abfd, info_ptr);
19376 else if (form == DW_FORM_strx3)
19378 str_index = read_3_bytes (abfd, info_ptr);
19381 else if (form == DW_FORM_strx4)
19383 str_index = read_4_bytes (abfd, info_ptr);
19388 str_index = read_unsigned_leb128 (abfd, info_ptr, &bytes_read);
19389 info_ptr += bytes_read;
19391 DW_STRING (attr) = read_str_index (reader, str_index);
19392 DW_STRING_IS_CANONICAL (attr) = 0;
19396 error (_("Dwarf Error: Cannot handle %s in DWARF reader [in module %s]"),
19397 dwarf_form_name (form),
19398 bfd_get_filename (abfd));
19402 if (cu->per_cu->is_dwz && attr_form_is_ref (attr))
19403 attr->form = DW_FORM_GNU_ref_alt;
19405 /* We have seen instances where the compiler tried to emit a byte
19406 size attribute of -1 which ended up being encoded as an unsigned
19407 0xffffffff. Although 0xffffffff is technically a valid size value,
19408 an object of this size seems pretty unlikely so we can relatively
19409 safely treat these cases as if the size attribute was invalid and
19410 treat them as zero by default. */
19411 if (attr->name == DW_AT_byte_size
19412 && form == DW_FORM_data4
19413 && DW_UNSND (attr) >= 0xffffffff)
19416 (_("Suspicious DW_AT_byte_size value treated as zero instead of %s"),
19417 hex_string (DW_UNSND (attr)));
19418 DW_UNSND (attr) = 0;
19424 /* Read an attribute described by an abbreviated attribute. */
19426 static const gdb_byte *
19427 read_attribute (const struct die_reader_specs *reader,
19428 struct attribute *attr, struct attr_abbrev *abbrev,
19429 const gdb_byte *info_ptr)
19431 attr->name = abbrev->name;
19432 return read_attribute_value (reader, attr, abbrev->form,
19433 abbrev->implicit_const, info_ptr);
19436 /* Read dwarf information from a buffer. */
19438 static unsigned int
19439 read_1_byte (bfd *abfd, const gdb_byte *buf)
19441 return bfd_get_8 (abfd, buf);
19445 read_1_signed_byte (bfd *abfd, const gdb_byte *buf)
19447 return bfd_get_signed_8 (abfd, buf);
19450 static unsigned int
19451 read_2_bytes (bfd *abfd, const gdb_byte *buf)
19453 return bfd_get_16 (abfd, buf);
19457 read_2_signed_bytes (bfd *abfd, const gdb_byte *buf)
19459 return bfd_get_signed_16 (abfd, buf);
19462 static unsigned int
19463 read_3_bytes (bfd *abfd, const gdb_byte *buf)
19465 unsigned int result = 0;
19466 for (int i = 0; i < 3; ++i)
19468 unsigned char byte = bfd_get_8 (abfd, buf);
19470 result |= ((unsigned int) byte << (i * 8));
19475 static unsigned int
19476 read_4_bytes (bfd *abfd, const gdb_byte *buf)
19478 return bfd_get_32 (abfd, buf);
19482 read_4_signed_bytes (bfd *abfd, const gdb_byte *buf)
19484 return bfd_get_signed_32 (abfd, buf);
19488 read_8_bytes (bfd *abfd, const gdb_byte *buf)
19490 return bfd_get_64 (abfd, buf);
19494 read_address (bfd *abfd, const gdb_byte *buf, struct dwarf2_cu *cu,
19495 unsigned int *bytes_read)
19497 struct comp_unit_head *cu_header = &cu->header;
19498 CORE_ADDR retval = 0;
19500 if (cu_header->signed_addr_p)
19502 switch (cu_header->addr_size)
19505 retval = bfd_get_signed_16 (abfd, buf);
19508 retval = bfd_get_signed_32 (abfd, buf);
19511 retval = bfd_get_signed_64 (abfd, buf);
19514 internal_error (__FILE__, __LINE__,
19515 _("read_address: bad switch, signed [in module %s]"),
19516 bfd_get_filename (abfd));
19521 switch (cu_header->addr_size)
19524 retval = bfd_get_16 (abfd, buf);
19527 retval = bfd_get_32 (abfd, buf);
19530 retval = bfd_get_64 (abfd, buf);
19533 internal_error (__FILE__, __LINE__,
19534 _("read_address: bad switch, "
19535 "unsigned [in module %s]"),
19536 bfd_get_filename (abfd));
19540 *bytes_read = cu_header->addr_size;
19544 /* Read the initial length from a section. The (draft) DWARF 3
19545 specification allows the initial length to take up either 4 bytes
19546 or 12 bytes. If the first 4 bytes are 0xffffffff, then the next 8
19547 bytes describe the length and all offsets will be 8 bytes in length
19550 An older, non-standard 64-bit format is also handled by this
19551 function. The older format in question stores the initial length
19552 as an 8-byte quantity without an escape value. Lengths greater
19553 than 2^32 aren't very common which means that the initial 4 bytes
19554 is almost always zero. Since a length value of zero doesn't make
19555 sense for the 32-bit format, this initial zero can be considered to
19556 be an escape value which indicates the presence of the older 64-bit
19557 format. As written, the code can't detect (old format) lengths
19558 greater than 4GB. If it becomes necessary to handle lengths
19559 somewhat larger than 4GB, we could allow other small values (such
19560 as the non-sensical values of 1, 2, and 3) to also be used as
19561 escape values indicating the presence of the old format.
19563 The value returned via bytes_read should be used to increment the
19564 relevant pointer after calling read_initial_length().
19566 [ Note: read_initial_length() and read_offset() are based on the
19567 document entitled "DWARF Debugging Information Format", revision
19568 3, draft 8, dated November 19, 2001. This document was obtained
19571 http://reality.sgiweb.org/davea/dwarf3-draft8-011125.pdf
19573 This document is only a draft and is subject to change. (So beware.)
19575 Details regarding the older, non-standard 64-bit format were
19576 determined empirically by examining 64-bit ELF files produced by
19577 the SGI toolchain on an IRIX 6.5 machine.
19579 - Kevin, July 16, 2002
19583 read_initial_length (bfd *abfd, const gdb_byte *buf, unsigned int *bytes_read)
19585 LONGEST length = bfd_get_32 (abfd, buf);
19587 if (length == 0xffffffff)
19589 length = bfd_get_64 (abfd, buf + 4);
19592 else if (length == 0)
19594 /* Handle the (non-standard) 64-bit DWARF2 format used by IRIX. */
19595 length = bfd_get_64 (abfd, buf);
19606 /* Cover function for read_initial_length.
19607 Returns the length of the object at BUF, and stores the size of the
19608 initial length in *BYTES_READ and stores the size that offsets will be in
19610 If the initial length size is not equivalent to that specified in
19611 CU_HEADER then issue a complaint.
19612 This is useful when reading non-comp-unit headers. */
19615 read_checked_initial_length_and_offset (bfd *abfd, const gdb_byte *buf,
19616 const struct comp_unit_head *cu_header,
19617 unsigned int *bytes_read,
19618 unsigned int *offset_size)
19620 LONGEST length = read_initial_length (abfd, buf, bytes_read);
19622 gdb_assert (cu_header->initial_length_size == 4
19623 || cu_header->initial_length_size == 8
19624 || cu_header->initial_length_size == 12);
19626 if (cu_header->initial_length_size != *bytes_read)
19627 complaint (_("intermixed 32-bit and 64-bit DWARF sections"));
19629 *offset_size = (*bytes_read == 4) ? 4 : 8;
19633 /* Read an offset from the data stream. The size of the offset is
19634 given by cu_header->offset_size. */
19637 read_offset (bfd *abfd, const gdb_byte *buf,
19638 const struct comp_unit_head *cu_header,
19639 unsigned int *bytes_read)
19641 LONGEST offset = read_offset_1 (abfd, buf, cu_header->offset_size);
19643 *bytes_read = cu_header->offset_size;
19647 /* Read an offset from the data stream. */
19650 read_offset_1 (bfd *abfd, const gdb_byte *buf, unsigned int offset_size)
19652 LONGEST retval = 0;
19654 switch (offset_size)
19657 retval = bfd_get_32 (abfd, buf);
19660 retval = bfd_get_64 (abfd, buf);
19663 internal_error (__FILE__, __LINE__,
19664 _("read_offset_1: bad switch [in module %s]"),
19665 bfd_get_filename (abfd));
19671 static const gdb_byte *
19672 read_n_bytes (bfd *abfd, const gdb_byte *buf, unsigned int size)
19674 /* If the size of a host char is 8 bits, we can return a pointer
19675 to the buffer, otherwise we have to copy the data to a buffer
19676 allocated on the temporary obstack. */
19677 gdb_assert (HOST_CHAR_BIT == 8);
19681 static const char *
19682 read_direct_string (bfd *abfd, const gdb_byte *buf,
19683 unsigned int *bytes_read_ptr)
19685 /* If the size of a host char is 8 bits, we can return a pointer
19686 to the string, otherwise we have to copy the string to a buffer
19687 allocated on the temporary obstack. */
19688 gdb_assert (HOST_CHAR_BIT == 8);
19691 *bytes_read_ptr = 1;
19694 *bytes_read_ptr = strlen ((const char *) buf) + 1;
19695 return (const char *) buf;
19698 /* Return pointer to string at section SECT offset STR_OFFSET with error
19699 reporting strings FORM_NAME and SECT_NAME. */
19701 static const char *
19702 read_indirect_string_at_offset_from (struct objfile *objfile,
19703 bfd *abfd, LONGEST str_offset,
19704 struct dwarf2_section_info *sect,
19705 const char *form_name,
19706 const char *sect_name)
19708 dwarf2_read_section (objfile, sect);
19709 if (sect->buffer == NULL)
19710 error (_("%s used without %s section [in module %s]"),
19711 form_name, sect_name, bfd_get_filename (abfd));
19712 if (str_offset >= sect->size)
19713 error (_("%s pointing outside of %s section [in module %s]"),
19714 form_name, sect_name, bfd_get_filename (abfd));
19715 gdb_assert (HOST_CHAR_BIT == 8);
19716 if (sect->buffer[str_offset] == '\0')
19718 return (const char *) (sect->buffer + str_offset);
19721 /* Return pointer to string at .debug_str offset STR_OFFSET. */
19723 static const char *
19724 read_indirect_string_at_offset (struct dwarf2_per_objfile *dwarf2_per_objfile,
19725 bfd *abfd, LONGEST str_offset)
19727 return read_indirect_string_at_offset_from (dwarf2_per_objfile->objfile,
19729 &dwarf2_per_objfile->str,
19730 "DW_FORM_strp", ".debug_str");
19733 /* Return pointer to string at .debug_line_str offset STR_OFFSET. */
19735 static const char *
19736 read_indirect_line_string_at_offset (struct dwarf2_per_objfile *dwarf2_per_objfile,
19737 bfd *abfd, LONGEST str_offset)
19739 return read_indirect_string_at_offset_from (dwarf2_per_objfile->objfile,
19741 &dwarf2_per_objfile->line_str,
19742 "DW_FORM_line_strp",
19743 ".debug_line_str");
19746 /* Read a string at offset STR_OFFSET in the .debug_str section from
19747 the .dwz file DWZ. Throw an error if the offset is too large. If
19748 the string consists of a single NUL byte, return NULL; otherwise
19749 return a pointer to the string. */
19751 static const char *
19752 read_indirect_string_from_dwz (struct objfile *objfile, struct dwz_file *dwz,
19753 LONGEST str_offset)
19755 dwarf2_read_section (objfile, &dwz->str);
19757 if (dwz->str.buffer == NULL)
19758 error (_("DW_FORM_GNU_strp_alt used without .debug_str "
19759 "section [in module %s]"),
19760 bfd_get_filename (dwz->dwz_bfd));
19761 if (str_offset >= dwz->str.size)
19762 error (_("DW_FORM_GNU_strp_alt pointing outside of "
19763 ".debug_str section [in module %s]"),
19764 bfd_get_filename (dwz->dwz_bfd));
19765 gdb_assert (HOST_CHAR_BIT == 8);
19766 if (dwz->str.buffer[str_offset] == '\0')
19768 return (const char *) (dwz->str.buffer + str_offset);
19771 /* Return pointer to string at .debug_str offset as read from BUF.
19772 BUF is assumed to be in a compilation unit described by CU_HEADER.
19773 Return *BYTES_READ_PTR count of bytes read from BUF. */
19775 static const char *
19776 read_indirect_string (struct dwarf2_per_objfile *dwarf2_per_objfile, bfd *abfd,
19777 const gdb_byte *buf,
19778 const struct comp_unit_head *cu_header,
19779 unsigned int *bytes_read_ptr)
19781 LONGEST str_offset = read_offset (abfd, buf, cu_header, bytes_read_ptr);
19783 return read_indirect_string_at_offset (dwarf2_per_objfile, abfd, str_offset);
19786 /* Return pointer to string at .debug_line_str offset as read from BUF.
19787 BUF is assumed to be in a compilation unit described by CU_HEADER.
19788 Return *BYTES_READ_PTR count of bytes read from BUF. */
19790 static const char *
19791 read_indirect_line_string (struct dwarf2_per_objfile *dwarf2_per_objfile,
19792 bfd *abfd, const gdb_byte *buf,
19793 const struct comp_unit_head *cu_header,
19794 unsigned int *bytes_read_ptr)
19796 LONGEST str_offset = read_offset (abfd, buf, cu_header, bytes_read_ptr);
19798 return read_indirect_line_string_at_offset (dwarf2_per_objfile, abfd,
19803 read_unsigned_leb128 (bfd *abfd, const gdb_byte *buf,
19804 unsigned int *bytes_read_ptr)
19807 unsigned int num_read;
19809 unsigned char byte;
19816 byte = bfd_get_8 (abfd, buf);
19819 result |= ((ULONGEST) (byte & 127) << shift);
19820 if ((byte & 128) == 0)
19826 *bytes_read_ptr = num_read;
19831 read_signed_leb128 (bfd *abfd, const gdb_byte *buf,
19832 unsigned int *bytes_read_ptr)
19835 int shift, num_read;
19836 unsigned char byte;
19843 byte = bfd_get_8 (abfd, buf);
19846 result |= ((ULONGEST) (byte & 127) << shift);
19848 if ((byte & 128) == 0)
19853 if ((shift < 8 * sizeof (result)) && (byte & 0x40))
19854 result |= -(((ULONGEST) 1) << shift);
19855 *bytes_read_ptr = num_read;
19859 /* Given index ADDR_INDEX in .debug_addr, fetch the value.
19860 ADDR_BASE is the DW_AT_GNU_addr_base attribute or zero.
19861 ADDR_SIZE is the size of addresses from the CU header. */
19864 read_addr_index_1 (struct dwarf2_per_objfile *dwarf2_per_objfile,
19865 unsigned int addr_index, ULONGEST addr_base, int addr_size)
19867 struct objfile *objfile = dwarf2_per_objfile->objfile;
19868 bfd *abfd = objfile->obfd;
19869 const gdb_byte *info_ptr;
19871 dwarf2_read_section (objfile, &dwarf2_per_objfile->addr);
19872 if (dwarf2_per_objfile->addr.buffer == NULL)
19873 error (_("DW_FORM_addr_index used without .debug_addr section [in module %s]"),
19874 objfile_name (objfile));
19875 if (addr_base + addr_index * addr_size >= dwarf2_per_objfile->addr.size)
19876 error (_("DW_FORM_addr_index pointing outside of "
19877 ".debug_addr section [in module %s]"),
19878 objfile_name (objfile));
19879 info_ptr = (dwarf2_per_objfile->addr.buffer
19880 + addr_base + addr_index * addr_size);
19881 if (addr_size == 4)
19882 return bfd_get_32 (abfd, info_ptr);
19884 return bfd_get_64 (abfd, info_ptr);
19887 /* Given index ADDR_INDEX in .debug_addr, fetch the value. */
19890 read_addr_index (struct dwarf2_cu *cu, unsigned int addr_index)
19892 return read_addr_index_1 (cu->per_cu->dwarf2_per_objfile, addr_index,
19893 cu->addr_base, cu->header.addr_size);
19896 /* Given a pointer to an leb128 value, fetch the value from .debug_addr. */
19899 read_addr_index_from_leb128 (struct dwarf2_cu *cu, const gdb_byte *info_ptr,
19900 unsigned int *bytes_read)
19902 bfd *abfd = cu->per_cu->dwarf2_per_objfile->objfile->obfd;
19903 unsigned int addr_index = read_unsigned_leb128 (abfd, info_ptr, bytes_read);
19905 return read_addr_index (cu, addr_index);
19908 /* Data structure to pass results from dwarf2_read_addr_index_reader
19909 back to dwarf2_read_addr_index. */
19911 struct dwarf2_read_addr_index_data
19913 ULONGEST addr_base;
19917 /* die_reader_func for dwarf2_read_addr_index. */
19920 dwarf2_read_addr_index_reader (const struct die_reader_specs *reader,
19921 const gdb_byte *info_ptr,
19922 struct die_info *comp_unit_die,
19926 struct dwarf2_cu *cu = reader->cu;
19927 struct dwarf2_read_addr_index_data *aidata =
19928 (struct dwarf2_read_addr_index_data *) data;
19930 aidata->addr_base = cu->addr_base;
19931 aidata->addr_size = cu->header.addr_size;
19934 /* Given an index in .debug_addr, fetch the value.
19935 NOTE: This can be called during dwarf expression evaluation,
19936 long after the debug information has been read, and thus per_cu->cu
19937 may no longer exist. */
19940 dwarf2_read_addr_index (struct dwarf2_per_cu_data *per_cu,
19941 unsigned int addr_index)
19943 struct dwarf2_per_objfile *dwarf2_per_objfile = per_cu->dwarf2_per_objfile;
19944 struct dwarf2_cu *cu = per_cu->cu;
19945 ULONGEST addr_base;
19948 /* We need addr_base and addr_size.
19949 If we don't have PER_CU->cu, we have to get it.
19950 Nasty, but the alternative is storing the needed info in PER_CU,
19951 which at this point doesn't seem justified: it's not clear how frequently
19952 it would get used and it would increase the size of every PER_CU.
19953 Entry points like dwarf2_per_cu_addr_size do a similar thing
19954 so we're not in uncharted territory here.
19955 Alas we need to be a bit more complicated as addr_base is contained
19958 We don't need to read the entire CU(/TU).
19959 We just need the header and top level die.
19961 IWBN to use the aging mechanism to let us lazily later discard the CU.
19962 For now we skip this optimization. */
19966 addr_base = cu->addr_base;
19967 addr_size = cu->header.addr_size;
19971 struct dwarf2_read_addr_index_data aidata;
19973 /* Note: We can't use init_cutu_and_read_dies_simple here,
19974 we need addr_base. */
19975 init_cutu_and_read_dies (per_cu, NULL, 0, 0, false,
19976 dwarf2_read_addr_index_reader, &aidata);
19977 addr_base = aidata.addr_base;
19978 addr_size = aidata.addr_size;
19981 return read_addr_index_1 (dwarf2_per_objfile, addr_index, addr_base,
19985 /* Given a DW_FORM_GNU_str_index or DW_FORM_strx, fetch the string.
19986 This is only used by the Fission support. */
19988 static const char *
19989 read_str_index (const struct die_reader_specs *reader, ULONGEST str_index)
19991 struct dwarf2_cu *cu = reader->cu;
19992 struct dwarf2_per_objfile *dwarf2_per_objfile
19993 = cu->per_cu->dwarf2_per_objfile;
19994 struct objfile *objfile = dwarf2_per_objfile->objfile;
19995 const char *objf_name = objfile_name (objfile);
19996 bfd *abfd = objfile->obfd;
19997 struct dwarf2_section_info *str_section = &reader->dwo_file->sections.str;
19998 struct dwarf2_section_info *str_offsets_section =
19999 &reader->dwo_file->sections.str_offsets;
20000 const gdb_byte *info_ptr;
20001 ULONGEST str_offset;
20002 static const char form_name[] = "DW_FORM_GNU_str_index or DW_FORM_strx";
20004 dwarf2_read_section (objfile, str_section);
20005 dwarf2_read_section (objfile, str_offsets_section);
20006 if (str_section->buffer == NULL)
20007 error (_("%s used without .debug_str.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_offsets_section->buffer == NULL)
20011 error (_("%s used without .debug_str_offsets.dwo section"
20012 " in CU at offset %s [in module %s]"),
20013 form_name, sect_offset_str (cu->header.sect_off), objf_name);
20014 if (str_index * cu->header.offset_size >= str_offsets_section->size)
20015 error (_("%s pointing outside of .debug_str_offsets.dwo"
20016 " section in CU at offset %s [in module %s]"),
20017 form_name, sect_offset_str (cu->header.sect_off), objf_name);
20018 info_ptr = (str_offsets_section->buffer
20019 + str_index * cu->header.offset_size);
20020 if (cu->header.offset_size == 4)
20021 str_offset = bfd_get_32 (abfd, info_ptr);
20023 str_offset = bfd_get_64 (abfd, info_ptr);
20024 if (str_offset >= str_section->size)
20025 error (_("Offset from %s pointing outside of"
20026 " .debug_str.dwo section in CU at offset %s [in module %s]"),
20027 form_name, sect_offset_str (cu->header.sect_off), objf_name);
20028 return (const char *) (str_section->buffer + str_offset);
20031 /* Return the length of an LEB128 number in BUF. */
20034 leb128_size (const gdb_byte *buf)
20036 const gdb_byte *begin = buf;
20042 if ((byte & 128) == 0)
20043 return buf - begin;
20048 set_cu_language (unsigned int lang, struct dwarf2_cu *cu)
20057 cu->language = language_c;
20060 case DW_LANG_C_plus_plus:
20061 case DW_LANG_C_plus_plus_11:
20062 case DW_LANG_C_plus_plus_14:
20063 cu->language = language_cplus;
20066 cu->language = language_d;
20068 case DW_LANG_Fortran77:
20069 case DW_LANG_Fortran90:
20070 case DW_LANG_Fortran95:
20071 case DW_LANG_Fortran03:
20072 case DW_LANG_Fortran08:
20073 cu->language = language_fortran;
20076 cu->language = language_go;
20078 case DW_LANG_Mips_Assembler:
20079 cu->language = language_asm;
20081 case DW_LANG_Ada83:
20082 case DW_LANG_Ada95:
20083 cu->language = language_ada;
20085 case DW_LANG_Modula2:
20086 cu->language = language_m2;
20088 case DW_LANG_Pascal83:
20089 cu->language = language_pascal;
20092 cu->language = language_objc;
20095 case DW_LANG_Rust_old:
20096 cu->language = language_rust;
20098 case DW_LANG_Cobol74:
20099 case DW_LANG_Cobol85:
20101 cu->language = language_minimal;
20104 cu->language_defn = language_def (cu->language);
20107 /* Return the named attribute or NULL if not there. */
20109 static struct attribute *
20110 dwarf2_attr (struct die_info *die, unsigned int name, struct dwarf2_cu *cu)
20115 struct attribute *spec = NULL;
20117 for (i = 0; i < die->num_attrs; ++i)
20119 if (die->attrs[i].name == name)
20120 return &die->attrs[i];
20121 if (die->attrs[i].name == DW_AT_specification
20122 || die->attrs[i].name == DW_AT_abstract_origin)
20123 spec = &die->attrs[i];
20129 die = follow_die_ref (die, spec, &cu);
20135 /* Return the named attribute or NULL if not there,
20136 but do not follow DW_AT_specification, etc.
20137 This is for use in contexts where we're reading .debug_types dies.
20138 Following DW_AT_specification, DW_AT_abstract_origin will take us
20139 back up the chain, and we want to go down. */
20141 static struct attribute *
20142 dwarf2_attr_no_follow (struct die_info *die, unsigned int name)
20146 for (i = 0; i < die->num_attrs; ++i)
20147 if (die->attrs[i].name == name)
20148 return &die->attrs[i];
20153 /* Return the string associated with a string-typed attribute, or NULL if it
20154 is either not found or is of an incorrect type. */
20156 static const char *
20157 dwarf2_string_attr (struct die_info *die, unsigned int name, struct dwarf2_cu *cu)
20159 struct attribute *attr;
20160 const char *str = NULL;
20162 attr = dwarf2_attr (die, name, cu);
20166 if (attr->form == DW_FORM_strp || attr->form == DW_FORM_line_strp
20167 || attr->form == DW_FORM_string
20168 || attr->form == DW_FORM_strx
20169 || attr->form == DW_FORM_GNU_str_index
20170 || attr->form == DW_FORM_GNU_strp_alt)
20171 str = DW_STRING (attr);
20173 complaint (_("string type expected for attribute %s for "
20174 "DIE at %s in module %s"),
20175 dwarf_attr_name (name), sect_offset_str (die->sect_off),
20176 objfile_name (cu->per_cu->dwarf2_per_objfile->objfile));
20182 /* Return non-zero iff the attribute NAME is defined for the given DIE,
20183 and holds a non-zero value. This function should only be used for
20184 DW_FORM_flag or DW_FORM_flag_present attributes. */
20187 dwarf2_flag_true_p (struct die_info *die, unsigned name, struct dwarf2_cu *cu)
20189 struct attribute *attr = dwarf2_attr (die, name, cu);
20191 return (attr && DW_UNSND (attr));
20195 die_is_declaration (struct die_info *die, struct dwarf2_cu *cu)
20197 /* A DIE is a declaration if it has a DW_AT_declaration attribute
20198 which value is non-zero. However, we have to be careful with
20199 DIEs having a DW_AT_specification attribute, because dwarf2_attr()
20200 (via dwarf2_flag_true_p) follows this attribute. So we may
20201 end up accidently finding a declaration attribute that belongs
20202 to a different DIE referenced by the specification attribute,
20203 even though the given DIE does not have a declaration attribute. */
20204 return (dwarf2_flag_true_p (die, DW_AT_declaration, cu)
20205 && dwarf2_attr (die, DW_AT_specification, cu) == NULL);
20208 /* Return the die giving the specification for DIE, if there is
20209 one. *SPEC_CU is the CU containing DIE on input, and the CU
20210 containing the return value on output. If there is no
20211 specification, but there is an abstract origin, that is
20214 static struct die_info *
20215 die_specification (struct die_info *die, struct dwarf2_cu **spec_cu)
20217 struct attribute *spec_attr = dwarf2_attr (die, DW_AT_specification,
20220 if (spec_attr == NULL)
20221 spec_attr = dwarf2_attr (die, DW_AT_abstract_origin, *spec_cu);
20223 if (spec_attr == NULL)
20226 return follow_die_ref (die, spec_attr, spec_cu);
20229 /* Stub for free_line_header to match void * callback types. */
20232 free_line_header_voidp (void *arg)
20234 struct line_header *lh = (struct line_header *) arg;
20240 line_header::add_include_dir (const char *include_dir)
20242 if (dwarf_line_debug >= 2)
20243 fprintf_unfiltered (gdb_stdlog, "Adding dir %zu: %s\n",
20244 include_dirs.size () + 1, include_dir);
20246 include_dirs.push_back (include_dir);
20250 line_header::add_file_name (const char *name,
20252 unsigned int mod_time,
20253 unsigned int length)
20255 if (dwarf_line_debug >= 2)
20256 fprintf_unfiltered (gdb_stdlog, "Adding file %u: %s\n",
20257 (unsigned) file_names.size () + 1, name);
20259 file_names.emplace_back (name, d_index, mod_time, length);
20262 /* A convenience function to find the proper .debug_line section for a CU. */
20264 static struct dwarf2_section_info *
20265 get_debug_line_section (struct dwarf2_cu *cu)
20267 struct dwarf2_section_info *section;
20268 struct dwarf2_per_objfile *dwarf2_per_objfile
20269 = cu->per_cu->dwarf2_per_objfile;
20271 /* For TUs in DWO files, the DW_AT_stmt_list attribute lives in the
20273 if (cu->dwo_unit && cu->per_cu->is_debug_types)
20274 section = &cu->dwo_unit->dwo_file->sections.line;
20275 else if (cu->per_cu->is_dwz)
20277 struct dwz_file *dwz = dwarf2_get_dwz_file (dwarf2_per_objfile);
20279 section = &dwz->line;
20282 section = &dwarf2_per_objfile->line;
20287 /* Read directory or file name entry format, starting with byte of
20288 format count entries, ULEB128 pairs of entry formats, ULEB128 of
20289 entries count and the entries themselves in the described entry
20293 read_formatted_entries (struct dwarf2_per_objfile *dwarf2_per_objfile,
20294 bfd *abfd, const gdb_byte **bufp,
20295 struct line_header *lh,
20296 const struct comp_unit_head *cu_header,
20297 void (*callback) (struct line_header *lh,
20300 unsigned int mod_time,
20301 unsigned int length))
20303 gdb_byte format_count, formati;
20304 ULONGEST data_count, datai;
20305 const gdb_byte *buf = *bufp;
20306 const gdb_byte *format_header_data;
20307 unsigned int bytes_read;
20309 format_count = read_1_byte (abfd, buf);
20311 format_header_data = buf;
20312 for (formati = 0; formati < format_count; formati++)
20314 read_unsigned_leb128 (abfd, buf, &bytes_read);
20316 read_unsigned_leb128 (abfd, buf, &bytes_read);
20320 data_count = read_unsigned_leb128 (abfd, buf, &bytes_read);
20322 for (datai = 0; datai < data_count; datai++)
20324 const gdb_byte *format = format_header_data;
20325 struct file_entry fe;
20327 for (formati = 0; formati < format_count; formati++)
20329 ULONGEST content_type = read_unsigned_leb128 (abfd, format, &bytes_read);
20330 format += bytes_read;
20332 ULONGEST form = read_unsigned_leb128 (abfd, format, &bytes_read);
20333 format += bytes_read;
20335 gdb::optional<const char *> string;
20336 gdb::optional<unsigned int> uint;
20340 case DW_FORM_string:
20341 string.emplace (read_direct_string (abfd, buf, &bytes_read));
20345 case DW_FORM_line_strp:
20346 string.emplace (read_indirect_line_string (dwarf2_per_objfile,
20353 case DW_FORM_data1:
20354 uint.emplace (read_1_byte (abfd, buf));
20358 case DW_FORM_data2:
20359 uint.emplace (read_2_bytes (abfd, buf));
20363 case DW_FORM_data4:
20364 uint.emplace (read_4_bytes (abfd, buf));
20368 case DW_FORM_data8:
20369 uint.emplace (read_8_bytes (abfd, buf));
20373 case DW_FORM_udata:
20374 uint.emplace (read_unsigned_leb128 (abfd, buf, &bytes_read));
20378 case DW_FORM_block:
20379 /* It is valid only for DW_LNCT_timestamp which is ignored by
20384 switch (content_type)
20387 if (string.has_value ())
20390 case DW_LNCT_directory_index:
20391 if (uint.has_value ())
20392 fe.d_index = (dir_index) *uint;
20394 case DW_LNCT_timestamp:
20395 if (uint.has_value ())
20396 fe.mod_time = *uint;
20399 if (uint.has_value ())
20405 complaint (_("Unknown format content type %s"),
20406 pulongest (content_type));
20410 callback (lh, fe.name, fe.d_index, fe.mod_time, fe.length);
20416 /* Read the statement program header starting at OFFSET in
20417 .debug_line, or .debug_line.dwo. Return a pointer
20418 to a struct line_header, allocated using xmalloc.
20419 Returns NULL if there is a problem reading the header, e.g., if it
20420 has a version we don't understand.
20422 NOTE: the strings in the include directory and file name tables of
20423 the returned object point into the dwarf line section buffer,
20424 and must not be freed. */
20426 static line_header_up
20427 dwarf_decode_line_header (sect_offset sect_off, struct dwarf2_cu *cu)
20429 const gdb_byte *line_ptr;
20430 unsigned int bytes_read, offset_size;
20432 const char *cur_dir, *cur_file;
20433 struct dwarf2_section_info *section;
20435 struct dwarf2_per_objfile *dwarf2_per_objfile
20436 = cu->per_cu->dwarf2_per_objfile;
20438 section = get_debug_line_section (cu);
20439 dwarf2_read_section (dwarf2_per_objfile->objfile, section);
20440 if (section->buffer == NULL)
20442 if (cu->dwo_unit && cu->per_cu->is_debug_types)
20443 complaint (_("missing .debug_line.dwo section"));
20445 complaint (_("missing .debug_line section"));
20449 /* We can't do this until we know the section is non-empty.
20450 Only then do we know we have such a section. */
20451 abfd = get_section_bfd_owner (section);
20453 /* Make sure that at least there's room for the total_length field.
20454 That could be 12 bytes long, but we're just going to fudge that. */
20455 if (to_underlying (sect_off) + 4 >= section->size)
20457 dwarf2_statement_list_fits_in_line_number_section_complaint ();
20461 line_header_up lh (new line_header ());
20463 lh->sect_off = sect_off;
20464 lh->offset_in_dwz = cu->per_cu->is_dwz;
20466 line_ptr = section->buffer + to_underlying (sect_off);
20468 /* Read in the header. */
20470 read_checked_initial_length_and_offset (abfd, line_ptr, &cu->header,
20471 &bytes_read, &offset_size);
20472 line_ptr += bytes_read;
20473 if (line_ptr + lh->total_length > (section->buffer + section->size))
20475 dwarf2_statement_list_fits_in_line_number_section_complaint ();
20478 lh->statement_program_end = line_ptr + lh->total_length;
20479 lh->version = read_2_bytes (abfd, line_ptr);
20481 if (lh->version > 5)
20483 /* This is a version we don't understand. The format could have
20484 changed in ways we don't handle properly so just punt. */
20485 complaint (_("unsupported version in .debug_line section"));
20488 if (lh->version >= 5)
20490 gdb_byte segment_selector_size;
20492 /* Skip address size. */
20493 read_1_byte (abfd, line_ptr);
20496 segment_selector_size = read_1_byte (abfd, line_ptr);
20498 if (segment_selector_size != 0)
20500 complaint (_("unsupported segment selector size %u "
20501 "in .debug_line section"),
20502 segment_selector_size);
20506 lh->header_length = read_offset_1 (abfd, line_ptr, offset_size);
20507 line_ptr += offset_size;
20508 lh->minimum_instruction_length = read_1_byte (abfd, line_ptr);
20510 if (lh->version >= 4)
20512 lh->maximum_ops_per_instruction = read_1_byte (abfd, line_ptr);
20516 lh->maximum_ops_per_instruction = 1;
20518 if (lh->maximum_ops_per_instruction == 0)
20520 lh->maximum_ops_per_instruction = 1;
20521 complaint (_("invalid maximum_ops_per_instruction "
20522 "in `.debug_line' section"));
20525 lh->default_is_stmt = read_1_byte (abfd, line_ptr);
20527 lh->line_base = read_1_signed_byte (abfd, line_ptr);
20529 lh->line_range = read_1_byte (abfd, line_ptr);
20531 lh->opcode_base = read_1_byte (abfd, line_ptr);
20533 lh->standard_opcode_lengths.reset (new unsigned char[lh->opcode_base]);
20535 lh->standard_opcode_lengths[0] = 1; /* This should never be used anyway. */
20536 for (i = 1; i < lh->opcode_base; ++i)
20538 lh->standard_opcode_lengths[i] = read_1_byte (abfd, line_ptr);
20542 if (lh->version >= 5)
20544 /* Read directory table. */
20545 read_formatted_entries (dwarf2_per_objfile, abfd, &line_ptr, lh.get (),
20547 [] (struct line_header *header, const char *name,
20548 dir_index d_index, unsigned int mod_time,
20549 unsigned int length)
20551 header->add_include_dir (name);
20554 /* Read file name table. */
20555 read_formatted_entries (dwarf2_per_objfile, abfd, &line_ptr, lh.get (),
20557 [] (struct line_header *header, const char *name,
20558 dir_index d_index, unsigned int mod_time,
20559 unsigned int length)
20561 header->add_file_name (name, d_index, mod_time, length);
20566 /* Read directory table. */
20567 while ((cur_dir = read_direct_string (abfd, line_ptr, &bytes_read)) != NULL)
20569 line_ptr += bytes_read;
20570 lh->add_include_dir (cur_dir);
20572 line_ptr += bytes_read;
20574 /* Read file name table. */
20575 while ((cur_file = read_direct_string (abfd, line_ptr, &bytes_read)) != NULL)
20577 unsigned int mod_time, length;
20580 line_ptr += bytes_read;
20581 d_index = (dir_index) read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
20582 line_ptr += bytes_read;
20583 mod_time = read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
20584 line_ptr += bytes_read;
20585 length = read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
20586 line_ptr += bytes_read;
20588 lh->add_file_name (cur_file, d_index, mod_time, length);
20590 line_ptr += bytes_read;
20592 lh->statement_program_start = line_ptr;
20594 if (line_ptr > (section->buffer + section->size))
20595 complaint (_("line number info header doesn't "
20596 "fit in `.debug_line' section"));
20601 /* Subroutine of dwarf_decode_lines to simplify it.
20602 Return the file name of the psymtab for included file FILE_INDEX
20603 in line header LH of PST.
20604 COMP_DIR is the compilation directory (DW_AT_comp_dir) or NULL if unknown.
20605 If space for the result is malloc'd, *NAME_HOLDER will be set.
20606 Returns NULL if FILE_INDEX should be ignored, i.e., it is pst->filename. */
20608 static const char *
20609 psymtab_include_file_name (const struct line_header *lh, int file_index,
20610 const struct partial_symtab *pst,
20611 const char *comp_dir,
20612 gdb::unique_xmalloc_ptr<char> *name_holder)
20614 const file_entry &fe = lh->file_names[file_index];
20615 const char *include_name = fe.name;
20616 const char *include_name_to_compare = include_name;
20617 const char *pst_filename;
20620 const char *dir_name = fe.include_dir (lh);
20622 gdb::unique_xmalloc_ptr<char> hold_compare;
20623 if (!IS_ABSOLUTE_PATH (include_name)
20624 && (dir_name != NULL || comp_dir != NULL))
20626 /* Avoid creating a duplicate psymtab for PST.
20627 We do this by comparing INCLUDE_NAME and PST_FILENAME.
20628 Before we do the comparison, however, we need to account
20629 for DIR_NAME and COMP_DIR.
20630 First prepend dir_name (if non-NULL). If we still don't
20631 have an absolute path prepend comp_dir (if non-NULL).
20632 However, the directory we record in the include-file's
20633 psymtab does not contain COMP_DIR (to match the
20634 corresponding symtab(s)).
20639 bash$ gcc -g ./hello.c
20640 include_name = "hello.c"
20642 DW_AT_comp_dir = comp_dir = "/tmp"
20643 DW_AT_name = "./hello.c"
20647 if (dir_name != NULL)
20649 name_holder->reset (concat (dir_name, SLASH_STRING,
20650 include_name, (char *) NULL));
20651 include_name = name_holder->get ();
20652 include_name_to_compare = include_name;
20654 if (!IS_ABSOLUTE_PATH (include_name) && comp_dir != NULL)
20656 hold_compare.reset (concat (comp_dir, SLASH_STRING,
20657 include_name, (char *) NULL));
20658 include_name_to_compare = hold_compare.get ();
20662 pst_filename = pst->filename;
20663 gdb::unique_xmalloc_ptr<char> copied_name;
20664 if (!IS_ABSOLUTE_PATH (pst_filename) && pst->dirname != NULL)
20666 copied_name.reset (concat (pst->dirname, SLASH_STRING,
20667 pst_filename, (char *) NULL));
20668 pst_filename = copied_name.get ();
20671 file_is_pst = FILENAME_CMP (include_name_to_compare, pst_filename) == 0;
20675 return include_name;
20678 /* State machine to track the state of the line number program. */
20680 class lnp_state_machine
20683 /* Initialize a machine state for the start of a line number
20685 lnp_state_machine (struct dwarf2_cu *cu, gdbarch *arch, line_header *lh,
20686 bool record_lines_p);
20688 file_entry *current_file ()
20690 /* lh->file_names is 0-based, but the file name numbers in the
20691 statement program are 1-based. */
20692 return m_line_header->file_name_at (m_file);
20695 /* Record the line in the state machine. END_SEQUENCE is true if
20696 we're processing the end of a sequence. */
20697 void record_line (bool end_sequence);
20699 /* Check ADDRESS is zero and less than UNRELOCATED_LOWPC and if true
20700 nop-out rest of the lines in this sequence. */
20701 void check_line_address (struct dwarf2_cu *cu,
20702 const gdb_byte *line_ptr,
20703 CORE_ADDR unrelocated_lowpc, CORE_ADDR address);
20705 void handle_set_discriminator (unsigned int discriminator)
20707 m_discriminator = discriminator;
20708 m_line_has_non_zero_discriminator |= discriminator != 0;
20711 /* Handle DW_LNE_set_address. */
20712 void handle_set_address (CORE_ADDR baseaddr, CORE_ADDR address)
20715 address += baseaddr;
20716 m_address = gdbarch_adjust_dwarf2_line (m_gdbarch, address, false);
20719 /* Handle DW_LNS_advance_pc. */
20720 void handle_advance_pc (CORE_ADDR adjust);
20722 /* Handle a special opcode. */
20723 void handle_special_opcode (unsigned char op_code);
20725 /* Handle DW_LNS_advance_line. */
20726 void handle_advance_line (int line_delta)
20728 advance_line (line_delta);
20731 /* Handle DW_LNS_set_file. */
20732 void handle_set_file (file_name_index file);
20734 /* Handle DW_LNS_negate_stmt. */
20735 void handle_negate_stmt ()
20737 m_is_stmt = !m_is_stmt;
20740 /* Handle DW_LNS_const_add_pc. */
20741 void handle_const_add_pc ();
20743 /* Handle DW_LNS_fixed_advance_pc. */
20744 void handle_fixed_advance_pc (CORE_ADDR addr_adj)
20746 m_address += gdbarch_adjust_dwarf2_line (m_gdbarch, addr_adj, true);
20750 /* Handle DW_LNS_copy. */
20751 void handle_copy ()
20753 record_line (false);
20754 m_discriminator = 0;
20757 /* Handle DW_LNE_end_sequence. */
20758 void handle_end_sequence ()
20760 m_currently_recording_lines = true;
20764 /* Advance the line by LINE_DELTA. */
20765 void advance_line (int line_delta)
20767 m_line += line_delta;
20769 if (line_delta != 0)
20770 m_line_has_non_zero_discriminator = m_discriminator != 0;
20773 struct dwarf2_cu *m_cu;
20775 gdbarch *m_gdbarch;
20777 /* True if we're recording lines.
20778 Otherwise we're building partial symtabs and are just interested in
20779 finding include files mentioned by the line number program. */
20780 bool m_record_lines_p;
20782 /* The line number header. */
20783 line_header *m_line_header;
20785 /* These are part of the standard DWARF line number state machine,
20786 and initialized according to the DWARF spec. */
20788 unsigned char m_op_index = 0;
20789 /* The line table index (1-based) of the current file. */
20790 file_name_index m_file = (file_name_index) 1;
20791 unsigned int m_line = 1;
20793 /* These are initialized in the constructor. */
20795 CORE_ADDR m_address;
20797 unsigned int m_discriminator;
20799 /* Additional bits of state we need to track. */
20801 /* The last file that we called dwarf2_start_subfile for.
20802 This is only used for TLLs. */
20803 unsigned int m_last_file = 0;
20804 /* The last file a line number was recorded for. */
20805 struct subfile *m_last_subfile = NULL;
20807 /* When true, record the lines we decode. */
20808 bool m_currently_recording_lines = false;
20810 /* The last line number that was recorded, used to coalesce
20811 consecutive entries for the same line. This can happen, for
20812 example, when discriminators are present. PR 17276. */
20813 unsigned int m_last_line = 0;
20814 bool m_line_has_non_zero_discriminator = false;
20818 lnp_state_machine::handle_advance_pc (CORE_ADDR adjust)
20820 CORE_ADDR addr_adj = (((m_op_index + adjust)
20821 / m_line_header->maximum_ops_per_instruction)
20822 * m_line_header->minimum_instruction_length);
20823 m_address += gdbarch_adjust_dwarf2_line (m_gdbarch, addr_adj, true);
20824 m_op_index = ((m_op_index + adjust)
20825 % m_line_header->maximum_ops_per_instruction);
20829 lnp_state_machine::handle_special_opcode (unsigned char op_code)
20831 unsigned char adj_opcode = op_code - m_line_header->opcode_base;
20832 CORE_ADDR addr_adj = (((m_op_index
20833 + (adj_opcode / m_line_header->line_range))
20834 / m_line_header->maximum_ops_per_instruction)
20835 * m_line_header->minimum_instruction_length);
20836 m_address += gdbarch_adjust_dwarf2_line (m_gdbarch, addr_adj, true);
20837 m_op_index = ((m_op_index + (adj_opcode / m_line_header->line_range))
20838 % m_line_header->maximum_ops_per_instruction);
20840 int line_delta = (m_line_header->line_base
20841 + (adj_opcode % m_line_header->line_range));
20842 advance_line (line_delta);
20843 record_line (false);
20844 m_discriminator = 0;
20848 lnp_state_machine::handle_set_file (file_name_index file)
20852 const file_entry *fe = current_file ();
20854 dwarf2_debug_line_missing_file_complaint ();
20855 else if (m_record_lines_p)
20857 const char *dir = fe->include_dir (m_line_header);
20859 m_last_subfile = m_cu->get_builder ()->get_current_subfile ();
20860 m_line_has_non_zero_discriminator = m_discriminator != 0;
20861 dwarf2_start_subfile (m_cu, fe->name, dir);
20866 lnp_state_machine::handle_const_add_pc ()
20869 = (255 - m_line_header->opcode_base) / m_line_header->line_range;
20872 = (((m_op_index + adjust)
20873 / m_line_header->maximum_ops_per_instruction)
20874 * m_line_header->minimum_instruction_length);
20876 m_address += gdbarch_adjust_dwarf2_line (m_gdbarch, addr_adj, true);
20877 m_op_index = ((m_op_index + adjust)
20878 % m_line_header->maximum_ops_per_instruction);
20881 /* Return non-zero if we should add LINE to the line number table.
20882 LINE is the line to add, LAST_LINE is the last line that was added,
20883 LAST_SUBFILE is the subfile for LAST_LINE.
20884 LINE_HAS_NON_ZERO_DISCRIMINATOR is non-zero if LINE has ever
20885 had a non-zero discriminator.
20887 We have to be careful in the presence of discriminators.
20888 E.g., for this line:
20890 for (i = 0; i < 100000; i++);
20892 clang can emit four line number entries for that one line,
20893 each with a different discriminator.
20894 See gdb.dwarf2/dw2-single-line-discriminators.exp for an example.
20896 However, we want gdb to coalesce all four entries into one.
20897 Otherwise the user could stepi into the middle of the line and
20898 gdb would get confused about whether the pc really was in the
20899 middle of the line.
20901 Things are further complicated by the fact that two consecutive
20902 line number entries for the same line is a heuristic used by gcc
20903 to denote the end of the prologue. So we can't just discard duplicate
20904 entries, we have to be selective about it. The heuristic we use is
20905 that we only collapse consecutive entries for the same line if at least
20906 one of those entries has a non-zero discriminator. PR 17276.
20908 Note: Addresses in the line number state machine can never go backwards
20909 within one sequence, thus this coalescing is ok. */
20912 dwarf_record_line_p (struct dwarf2_cu *cu,
20913 unsigned int line, unsigned int last_line,
20914 int line_has_non_zero_discriminator,
20915 struct subfile *last_subfile)
20917 if (cu->get_builder ()->get_current_subfile () != last_subfile)
20919 if (line != last_line)
20921 /* Same line for the same file that we've seen already.
20922 As a last check, for pr 17276, only record the line if the line
20923 has never had a non-zero discriminator. */
20924 if (!line_has_non_zero_discriminator)
20929 /* Use the CU's builder to record line number LINE beginning at
20930 address ADDRESS in the line table of subfile SUBFILE. */
20933 dwarf_record_line_1 (struct gdbarch *gdbarch, struct subfile *subfile,
20934 unsigned int line, CORE_ADDR address,
20935 struct dwarf2_cu *cu)
20937 CORE_ADDR addr = gdbarch_addr_bits_remove (gdbarch, address);
20939 if (dwarf_line_debug)
20941 fprintf_unfiltered (gdb_stdlog,
20942 "Recording line %u, file %s, address %s\n",
20943 line, lbasename (subfile->name),
20944 paddress (gdbarch, address));
20948 cu->get_builder ()->record_line (subfile, line, addr);
20951 /* Subroutine of dwarf_decode_lines_1 to simplify it.
20952 Mark the end of a set of line number records.
20953 The arguments are the same as for dwarf_record_line_1.
20954 If SUBFILE is NULL the request is ignored. */
20957 dwarf_finish_line (struct gdbarch *gdbarch, struct subfile *subfile,
20958 CORE_ADDR address, struct dwarf2_cu *cu)
20960 if (subfile == NULL)
20963 if (dwarf_line_debug)
20965 fprintf_unfiltered (gdb_stdlog,
20966 "Finishing current line, file %s, address %s\n",
20967 lbasename (subfile->name),
20968 paddress (gdbarch, address));
20971 dwarf_record_line_1 (gdbarch, subfile, 0, address, cu);
20975 lnp_state_machine::record_line (bool end_sequence)
20977 if (dwarf_line_debug)
20979 fprintf_unfiltered (gdb_stdlog,
20980 "Processing actual line %u: file %u,"
20981 " address %s, is_stmt %u, discrim %u\n",
20982 m_line, to_underlying (m_file),
20983 paddress (m_gdbarch, m_address),
20984 m_is_stmt, m_discriminator);
20987 file_entry *fe = current_file ();
20990 dwarf2_debug_line_missing_file_complaint ();
20991 /* For now we ignore lines not starting on an instruction boundary.
20992 But not when processing end_sequence for compatibility with the
20993 previous version of the code. */
20994 else if (m_op_index == 0 || end_sequence)
20996 fe->included_p = 1;
20997 if (m_record_lines_p && (producer_is_codewarrior (m_cu) || m_is_stmt))
20999 if (m_last_subfile != m_cu->get_builder ()->get_current_subfile ()
21002 dwarf_finish_line (m_gdbarch, m_last_subfile, m_address,
21003 m_currently_recording_lines ? m_cu : nullptr);
21008 if (dwarf_record_line_p (m_cu, m_line, m_last_line,
21009 m_line_has_non_zero_discriminator,
21012 buildsym_compunit *builder = m_cu->get_builder ();
21013 dwarf_record_line_1 (m_gdbarch,
21014 builder->get_current_subfile (),
21016 m_currently_recording_lines ? m_cu : nullptr);
21018 m_last_subfile = m_cu->get_builder ()->get_current_subfile ();
21019 m_last_line = m_line;
21025 lnp_state_machine::lnp_state_machine (struct dwarf2_cu *cu, gdbarch *arch,
21026 line_header *lh, bool record_lines_p)
21030 m_record_lines_p = record_lines_p;
21031 m_line_header = lh;
21033 m_currently_recording_lines = true;
21035 /* Call `gdbarch_adjust_dwarf2_line' on the initial 0 address as if there
21036 was a line entry for it so that the backend has a chance to adjust it
21037 and also record it in case it needs it. This is currently used by MIPS
21038 code, cf. `mips_adjust_dwarf2_line'. */
21039 m_address = gdbarch_adjust_dwarf2_line (arch, 0, 0);
21040 m_is_stmt = lh->default_is_stmt;
21041 m_discriminator = 0;
21045 lnp_state_machine::check_line_address (struct dwarf2_cu *cu,
21046 const gdb_byte *line_ptr,
21047 CORE_ADDR unrelocated_lowpc, CORE_ADDR address)
21049 /* If ADDRESS < UNRELOCATED_LOWPC then it's not a usable value, it's outside
21050 the pc range of the CU. However, we restrict the test to only ADDRESS
21051 values of zero to preserve GDB's previous behaviour which is to handle
21052 the specific case of a function being GC'd by the linker. */
21054 if (address == 0 && address < unrelocated_lowpc)
21056 /* This line table is for a function which has been
21057 GCd by the linker. Ignore it. PR gdb/12528 */
21059 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
21060 long line_offset = line_ptr - get_debug_line_section (cu)->buffer;
21062 complaint (_(".debug_line address at offset 0x%lx is 0 [in module %s]"),
21063 line_offset, objfile_name (objfile));
21064 m_currently_recording_lines = false;
21065 /* Note: m_currently_recording_lines is left as false until we see
21066 DW_LNE_end_sequence. */
21070 /* Subroutine of dwarf_decode_lines to simplify it.
21071 Process the line number information in LH.
21072 If DECODE_FOR_PST_P is non-zero, all we do is process the line number
21073 program in order to set included_p for every referenced header. */
21076 dwarf_decode_lines_1 (struct line_header *lh, struct dwarf2_cu *cu,
21077 const int decode_for_pst_p, CORE_ADDR lowpc)
21079 const gdb_byte *line_ptr, *extended_end;
21080 const gdb_byte *line_end;
21081 unsigned int bytes_read, extended_len;
21082 unsigned char op_code, extended_op;
21083 CORE_ADDR baseaddr;
21084 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
21085 bfd *abfd = objfile->obfd;
21086 struct gdbarch *gdbarch = get_objfile_arch (objfile);
21087 /* True if we're recording line info (as opposed to building partial
21088 symtabs and just interested in finding include files mentioned by
21089 the line number program). */
21090 bool record_lines_p = !decode_for_pst_p;
21092 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
21094 line_ptr = lh->statement_program_start;
21095 line_end = lh->statement_program_end;
21097 /* Read the statement sequences until there's nothing left. */
21098 while (line_ptr < line_end)
21100 /* The DWARF line number program state machine. Reset the state
21101 machine at the start of each sequence. */
21102 lnp_state_machine state_machine (cu, gdbarch, lh, record_lines_p);
21103 bool end_sequence = false;
21105 if (record_lines_p)
21107 /* Start a subfile for the current file of the state
21109 const file_entry *fe = state_machine.current_file ();
21112 dwarf2_start_subfile (cu, fe->name, fe->include_dir (lh));
21115 /* Decode the table. */
21116 while (line_ptr < line_end && !end_sequence)
21118 op_code = read_1_byte (abfd, line_ptr);
21121 if (op_code >= lh->opcode_base)
21123 /* Special opcode. */
21124 state_machine.handle_special_opcode (op_code);
21126 else switch (op_code)
21128 case DW_LNS_extended_op:
21129 extended_len = read_unsigned_leb128 (abfd, line_ptr,
21131 line_ptr += bytes_read;
21132 extended_end = line_ptr + extended_len;
21133 extended_op = read_1_byte (abfd, line_ptr);
21135 switch (extended_op)
21137 case DW_LNE_end_sequence:
21138 state_machine.handle_end_sequence ();
21139 end_sequence = true;
21141 case DW_LNE_set_address:
21144 = read_address (abfd, line_ptr, cu, &bytes_read);
21145 line_ptr += bytes_read;
21147 state_machine.check_line_address (cu, line_ptr,
21148 lowpc - baseaddr, address);
21149 state_machine.handle_set_address (baseaddr, address);
21152 case DW_LNE_define_file:
21154 const char *cur_file;
21155 unsigned int mod_time, length;
21158 cur_file = read_direct_string (abfd, line_ptr,
21160 line_ptr += bytes_read;
21161 dindex = (dir_index)
21162 read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
21163 line_ptr += bytes_read;
21165 read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
21166 line_ptr += bytes_read;
21168 read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
21169 line_ptr += bytes_read;
21170 lh->add_file_name (cur_file, dindex, mod_time, length);
21173 case DW_LNE_set_discriminator:
21175 /* The discriminator is not interesting to the
21176 debugger; just ignore it. We still need to
21177 check its value though:
21178 if there are consecutive entries for the same
21179 (non-prologue) line we want to coalesce them.
21182 = read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
21183 line_ptr += bytes_read;
21185 state_machine.handle_set_discriminator (discr);
21189 complaint (_("mangled .debug_line section"));
21192 /* Make sure that we parsed the extended op correctly. If e.g.
21193 we expected a different address size than the producer used,
21194 we may have read the wrong number of bytes. */
21195 if (line_ptr != extended_end)
21197 complaint (_("mangled .debug_line section"));
21202 state_machine.handle_copy ();
21204 case DW_LNS_advance_pc:
21207 = read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
21208 line_ptr += bytes_read;
21210 state_machine.handle_advance_pc (adjust);
21213 case DW_LNS_advance_line:
21216 = read_signed_leb128 (abfd, line_ptr, &bytes_read);
21217 line_ptr += bytes_read;
21219 state_machine.handle_advance_line (line_delta);
21222 case DW_LNS_set_file:
21224 file_name_index file
21225 = (file_name_index) read_unsigned_leb128 (abfd, line_ptr,
21227 line_ptr += bytes_read;
21229 state_machine.handle_set_file (file);
21232 case DW_LNS_set_column:
21233 (void) read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
21234 line_ptr += bytes_read;
21236 case DW_LNS_negate_stmt:
21237 state_machine.handle_negate_stmt ();
21239 case DW_LNS_set_basic_block:
21241 /* Add to the address register of the state machine the
21242 address increment value corresponding to special opcode
21243 255. I.e., this value is scaled by the minimum
21244 instruction length since special opcode 255 would have
21245 scaled the increment. */
21246 case DW_LNS_const_add_pc:
21247 state_machine.handle_const_add_pc ();
21249 case DW_LNS_fixed_advance_pc:
21251 CORE_ADDR addr_adj = read_2_bytes (abfd, line_ptr);
21254 state_machine.handle_fixed_advance_pc (addr_adj);
21259 /* Unknown standard opcode, ignore it. */
21262 for (i = 0; i < lh->standard_opcode_lengths[op_code]; i++)
21264 (void) read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
21265 line_ptr += bytes_read;
21272 dwarf2_debug_line_missing_end_sequence_complaint ();
21274 /* We got a DW_LNE_end_sequence (or we ran off the end of the buffer,
21275 in which case we still finish recording the last line). */
21276 state_machine.record_line (true);
21280 /* Decode the Line Number Program (LNP) for the given line_header
21281 structure and CU. The actual information extracted and the type
21282 of structures created from the LNP depends on the value of PST.
21284 1. If PST is NULL, then this procedure uses the data from the program
21285 to create all necessary symbol tables, and their linetables.
21287 2. If PST is not NULL, this procedure reads the program to determine
21288 the list of files included by the unit represented by PST, and
21289 builds all the associated partial symbol tables.
21291 COMP_DIR is the compilation directory (DW_AT_comp_dir) or NULL if unknown.
21292 It is used for relative paths in the line table.
21293 NOTE: When processing partial symtabs (pst != NULL),
21294 comp_dir == pst->dirname.
21296 NOTE: It is important that psymtabs have the same file name (via strcmp)
21297 as the corresponding symtab. Since COMP_DIR is not used in the name of the
21298 symtab we don't use it in the name of the psymtabs we create.
21299 E.g. expand_line_sal requires this when finding psymtabs to expand.
21300 A good testcase for this is mb-inline.exp.
21302 LOWPC is the lowest address in CU (or 0 if not known).
21304 Boolean DECODE_MAPPING specifies we need to fully decode .debug_line
21305 for its PC<->lines mapping information. Otherwise only the filename
21306 table is read in. */
21309 dwarf_decode_lines (struct line_header *lh, const char *comp_dir,
21310 struct dwarf2_cu *cu, struct partial_symtab *pst,
21311 CORE_ADDR lowpc, int decode_mapping)
21313 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
21314 const int decode_for_pst_p = (pst != NULL);
21316 if (decode_mapping)
21317 dwarf_decode_lines_1 (lh, cu, decode_for_pst_p, lowpc);
21319 if (decode_for_pst_p)
21323 /* Now that we're done scanning the Line Header Program, we can
21324 create the psymtab of each included file. */
21325 for (file_index = 0; file_index < lh->file_names.size (); file_index++)
21326 if (lh->file_names[file_index].included_p == 1)
21328 gdb::unique_xmalloc_ptr<char> name_holder;
21329 const char *include_name =
21330 psymtab_include_file_name (lh, file_index, pst, comp_dir,
21332 if (include_name != NULL)
21333 dwarf2_create_include_psymtab (include_name, pst, objfile);
21338 /* Make sure a symtab is created for every file, even files
21339 which contain only variables (i.e. no code with associated
21341 buildsym_compunit *builder = cu->get_builder ();
21342 struct compunit_symtab *cust = builder->get_compunit_symtab ();
21345 for (i = 0; i < lh->file_names.size (); i++)
21347 file_entry &fe = lh->file_names[i];
21349 dwarf2_start_subfile (cu, fe.name, fe.include_dir (lh));
21351 if (builder->get_current_subfile ()->symtab == NULL)
21353 builder->get_current_subfile ()->symtab
21354 = allocate_symtab (cust,
21355 builder->get_current_subfile ()->name);
21357 fe.symtab = builder->get_current_subfile ()->symtab;
21362 /* Start a subfile for DWARF. FILENAME is the name of the file and
21363 DIRNAME the name of the source directory which contains FILENAME
21364 or NULL if not known.
21365 This routine tries to keep line numbers from identical absolute and
21366 relative file names in a common subfile.
21368 Using the `list' example from the GDB testsuite, which resides in
21369 /srcdir and compiling it with Irix6.2 cc in /compdir using a filename
21370 of /srcdir/list0.c yields the following debugging information for list0.c:
21372 DW_AT_name: /srcdir/list0.c
21373 DW_AT_comp_dir: /compdir
21374 files.files[0].name: list0.h
21375 files.files[0].dir: /srcdir
21376 files.files[1].name: list0.c
21377 files.files[1].dir: /srcdir
21379 The line number information for list0.c has to end up in a single
21380 subfile, so that `break /srcdir/list0.c:1' works as expected.
21381 start_subfile will ensure that this happens provided that we pass the
21382 concatenation of files.files[1].dir and files.files[1].name as the
21386 dwarf2_start_subfile (struct dwarf2_cu *cu, const char *filename,
21387 const char *dirname)
21391 /* In order not to lose the line information directory,
21392 we concatenate it to the filename when it makes sense.
21393 Note that the Dwarf3 standard says (speaking of filenames in line
21394 information): ``The directory index is ignored for file names
21395 that represent full path names''. Thus ignoring dirname in the
21396 `else' branch below isn't an issue. */
21398 if (!IS_ABSOLUTE_PATH (filename) && dirname != NULL)
21400 copy = concat (dirname, SLASH_STRING, filename, (char *)NULL);
21404 cu->get_builder ()->start_subfile (filename);
21410 /* Start a symtab for DWARF. NAME, COMP_DIR, LOW_PC are passed to the
21411 buildsym_compunit constructor. */
21413 struct compunit_symtab *
21414 dwarf2_cu::start_symtab (const char *name, const char *comp_dir,
21417 gdb_assert (m_builder == nullptr);
21419 m_builder.reset (new struct buildsym_compunit
21420 (per_cu->dwarf2_per_objfile->objfile,
21421 name, comp_dir, language, low_pc));
21423 list_in_scope = get_builder ()->get_file_symbols ();
21425 get_builder ()->record_debugformat ("DWARF 2");
21426 get_builder ()->record_producer (producer);
21428 processing_has_namespace_info = false;
21430 return get_builder ()->get_compunit_symtab ();
21434 var_decode_location (struct attribute *attr, struct symbol *sym,
21435 struct dwarf2_cu *cu)
21437 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
21438 struct comp_unit_head *cu_header = &cu->header;
21440 /* NOTE drow/2003-01-30: There used to be a comment and some special
21441 code here to turn a symbol with DW_AT_external and a
21442 SYMBOL_VALUE_ADDRESS of 0 into a LOC_UNRESOLVED symbol. This was
21443 necessary for platforms (maybe Alpha, certainly PowerPC GNU/Linux
21444 with some versions of binutils) where shared libraries could have
21445 relocations against symbols in their debug information - the
21446 minimal symbol would have the right address, but the debug info
21447 would not. It's no longer necessary, because we will explicitly
21448 apply relocations when we read in the debug information now. */
21450 /* A DW_AT_location attribute with no contents indicates that a
21451 variable has been optimized away. */
21452 if (attr_form_is_block (attr) && DW_BLOCK (attr)->size == 0)
21454 SYMBOL_ACLASS_INDEX (sym) = LOC_OPTIMIZED_OUT;
21458 /* Handle one degenerate form of location expression specially, to
21459 preserve GDB's previous behavior when section offsets are
21460 specified. If this is just a DW_OP_addr, DW_OP_addrx, or
21461 DW_OP_GNU_addr_index then mark this symbol as LOC_STATIC. */
21463 if (attr_form_is_block (attr)
21464 && ((DW_BLOCK (attr)->data[0] == DW_OP_addr
21465 && DW_BLOCK (attr)->size == 1 + cu_header->addr_size)
21466 || ((DW_BLOCK (attr)->data[0] == DW_OP_GNU_addr_index
21467 || DW_BLOCK (attr)->data[0] == DW_OP_addrx)
21468 && (DW_BLOCK (attr)->size
21469 == 1 + leb128_size (&DW_BLOCK (attr)->data[1])))))
21471 unsigned int dummy;
21473 if (DW_BLOCK (attr)->data[0] == DW_OP_addr)
21474 SYMBOL_VALUE_ADDRESS (sym) =
21475 read_address (objfile->obfd, DW_BLOCK (attr)->data + 1, cu, &dummy);
21477 SYMBOL_VALUE_ADDRESS (sym) =
21478 read_addr_index_from_leb128 (cu, DW_BLOCK (attr)->data + 1, &dummy);
21479 SYMBOL_ACLASS_INDEX (sym) = LOC_STATIC;
21480 fixup_symbol_section (sym, objfile);
21481 SYMBOL_VALUE_ADDRESS (sym) += ANOFFSET (objfile->section_offsets,
21482 SYMBOL_SECTION (sym));
21486 /* NOTE drow/2002-01-30: It might be worthwhile to have a static
21487 expression evaluator, and use LOC_COMPUTED only when necessary
21488 (i.e. when the value of a register or memory location is
21489 referenced, or a thread-local block, etc.). Then again, it might
21490 not be worthwhile. I'm assuming that it isn't unless performance
21491 or memory numbers show me otherwise. */
21493 dwarf2_symbol_mark_computed (attr, sym, cu, 0);
21495 if (SYMBOL_COMPUTED_OPS (sym)->location_has_loclist)
21496 cu->has_loclist = true;
21499 /* Given a pointer to a DWARF information entry, figure out if we need
21500 to make a symbol table entry for it, and if so, create a new entry
21501 and return a pointer to it.
21502 If TYPE is NULL, determine symbol type from the die, otherwise
21503 used the passed type.
21504 If SPACE is not NULL, use it to hold the new symbol. If it is
21505 NULL, allocate a new symbol on the objfile's obstack. */
21507 static struct symbol *
21508 new_symbol (struct die_info *die, struct type *type, struct dwarf2_cu *cu,
21509 struct symbol *space)
21511 struct dwarf2_per_objfile *dwarf2_per_objfile
21512 = cu->per_cu->dwarf2_per_objfile;
21513 struct objfile *objfile = dwarf2_per_objfile->objfile;
21514 struct gdbarch *gdbarch = get_objfile_arch (objfile);
21515 struct symbol *sym = NULL;
21517 struct attribute *attr = NULL;
21518 struct attribute *attr2 = NULL;
21519 CORE_ADDR baseaddr;
21520 struct pending **list_to_add = NULL;
21522 int inlined_func = (die->tag == DW_TAG_inlined_subroutine);
21524 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
21526 name = dwarf2_name (die, cu);
21529 const char *linkagename;
21530 int suppress_add = 0;
21535 sym = allocate_symbol (objfile);
21536 OBJSTAT (objfile, n_syms++);
21538 /* Cache this symbol's name and the name's demangled form (if any). */
21539 SYMBOL_SET_LANGUAGE (sym, cu->language, &objfile->objfile_obstack);
21540 linkagename = dwarf2_physname (name, die, cu);
21541 SYMBOL_SET_NAMES (sym, linkagename, strlen (linkagename), 0, objfile);
21543 /* Fortran does not have mangling standard and the mangling does differ
21544 between gfortran, iFort etc. */
21545 if (cu->language == language_fortran
21546 && symbol_get_demangled_name (&(sym->ginfo)) == NULL)
21547 symbol_set_demangled_name (&(sym->ginfo),
21548 dwarf2_full_name (name, die, cu),
21551 /* Default assumptions.
21552 Use the passed type or decode it from the die. */
21553 SYMBOL_DOMAIN (sym) = VAR_DOMAIN;
21554 SYMBOL_ACLASS_INDEX (sym) = LOC_OPTIMIZED_OUT;
21556 SYMBOL_TYPE (sym) = type;
21558 SYMBOL_TYPE (sym) = die_type (die, cu);
21559 attr = dwarf2_attr (die,
21560 inlined_func ? DW_AT_call_line : DW_AT_decl_line,
21564 SYMBOL_LINE (sym) = DW_UNSND (attr);
21567 attr = dwarf2_attr (die,
21568 inlined_func ? DW_AT_call_file : DW_AT_decl_file,
21572 file_name_index file_index = (file_name_index) DW_UNSND (attr);
21573 struct file_entry *fe;
21575 if (cu->line_header != NULL)
21576 fe = cu->line_header->file_name_at (file_index);
21581 complaint (_("file index out of range"));
21583 symbol_set_symtab (sym, fe->symtab);
21589 attr = dwarf2_attr (die, DW_AT_low_pc, cu);
21594 addr = attr_value_as_address (attr);
21595 addr = gdbarch_adjust_dwarf2_addr (gdbarch, addr + baseaddr);
21596 SYMBOL_VALUE_ADDRESS (sym) = addr;
21598 SYMBOL_TYPE (sym) = objfile_type (objfile)->builtin_core_addr;
21599 SYMBOL_DOMAIN (sym) = LABEL_DOMAIN;
21600 SYMBOL_ACLASS_INDEX (sym) = LOC_LABEL;
21601 add_symbol_to_list (sym, cu->list_in_scope);
21603 case DW_TAG_subprogram:
21604 /* SYMBOL_BLOCK_VALUE (sym) will be filled in later by
21606 SYMBOL_ACLASS_INDEX (sym) = LOC_BLOCK;
21607 attr2 = dwarf2_attr (die, DW_AT_external, cu);
21608 if ((attr2 && (DW_UNSND (attr2) != 0))
21609 || cu->language == language_ada)
21611 /* Subprograms marked external are stored as a global symbol.
21612 Ada subprograms, whether marked external or not, are always
21613 stored as a global symbol, because we want to be able to
21614 access them globally. For instance, we want to be able
21615 to break on a nested subprogram without having to
21616 specify the context. */
21617 list_to_add = cu->get_builder ()->get_global_symbols ();
21621 list_to_add = cu->list_in_scope;
21624 case DW_TAG_inlined_subroutine:
21625 /* SYMBOL_BLOCK_VALUE (sym) will be filled in later by
21627 SYMBOL_ACLASS_INDEX (sym) = LOC_BLOCK;
21628 SYMBOL_INLINED (sym) = 1;
21629 list_to_add = cu->list_in_scope;
21631 case DW_TAG_template_value_param:
21633 /* Fall through. */
21634 case DW_TAG_constant:
21635 case DW_TAG_variable:
21636 case DW_TAG_member:
21637 /* Compilation with minimal debug info may result in
21638 variables with missing type entries. Change the
21639 misleading `void' type to something sensible. */
21640 if (TYPE_CODE (SYMBOL_TYPE (sym)) == TYPE_CODE_VOID)
21641 SYMBOL_TYPE (sym) = objfile_type (objfile)->builtin_int;
21643 attr = dwarf2_attr (die, DW_AT_const_value, cu);
21644 /* In the case of DW_TAG_member, we should only be called for
21645 static const members. */
21646 if (die->tag == DW_TAG_member)
21648 /* dwarf2_add_field uses die_is_declaration,
21649 so we do the same. */
21650 gdb_assert (die_is_declaration (die, cu));
21655 dwarf2_const_value (attr, sym, cu);
21656 attr2 = dwarf2_attr (die, DW_AT_external, cu);
21659 if (attr2 && (DW_UNSND (attr2) != 0))
21660 list_to_add = cu->get_builder ()->get_global_symbols ();
21662 list_to_add = cu->list_in_scope;
21666 attr = dwarf2_attr (die, DW_AT_location, cu);
21669 var_decode_location (attr, sym, cu);
21670 attr2 = dwarf2_attr (die, DW_AT_external, cu);
21672 /* Fortran explicitly imports any global symbols to the local
21673 scope by DW_TAG_common_block. */
21674 if (cu->language == language_fortran && die->parent
21675 && die->parent->tag == DW_TAG_common_block)
21678 if (SYMBOL_CLASS (sym) == LOC_STATIC
21679 && SYMBOL_VALUE_ADDRESS (sym) == 0
21680 && !dwarf2_per_objfile->has_section_at_zero)
21682 /* When a static variable is eliminated by the linker,
21683 the corresponding debug information is not stripped
21684 out, but the variable address is set to null;
21685 do not add such variables into symbol table. */
21687 else if (attr2 && (DW_UNSND (attr2) != 0))
21689 /* Workaround gfortran PR debug/40040 - it uses
21690 DW_AT_location for variables in -fPIC libraries which may
21691 get overriden by other libraries/executable and get
21692 a different address. Resolve it by the minimal symbol
21693 which may come from inferior's executable using copy
21694 relocation. Make this workaround only for gfortran as for
21695 other compilers GDB cannot guess the minimal symbol
21696 Fortran mangling kind. */
21697 if (cu->language == language_fortran && die->parent
21698 && die->parent->tag == DW_TAG_module
21700 && startswith (cu->producer, "GNU Fortran"))
21701 SYMBOL_ACLASS_INDEX (sym) = LOC_UNRESOLVED;
21703 /* A variable with DW_AT_external is never static,
21704 but it may be block-scoped. */
21706 = ((cu->list_in_scope
21707 == cu->get_builder ()->get_file_symbols ())
21708 ? cu->get_builder ()->get_global_symbols ()
21709 : cu->list_in_scope);
21712 list_to_add = cu->list_in_scope;
21716 /* We do not know the address of this symbol.
21717 If it is an external symbol and we have type information
21718 for it, enter the symbol as a LOC_UNRESOLVED symbol.
21719 The address of the variable will then be determined from
21720 the minimal symbol table whenever the variable is
21722 attr2 = dwarf2_attr (die, DW_AT_external, cu);
21724 /* Fortran explicitly imports any global symbols to the local
21725 scope by DW_TAG_common_block. */
21726 if (cu->language == language_fortran && die->parent
21727 && die->parent->tag == DW_TAG_common_block)
21729 /* SYMBOL_CLASS doesn't matter here because
21730 read_common_block is going to reset it. */
21732 list_to_add = cu->list_in_scope;
21734 else if (attr2 && (DW_UNSND (attr2) != 0)
21735 && dwarf2_attr (die, DW_AT_type, cu) != NULL)
21737 /* A variable with DW_AT_external is never static, but it
21738 may be block-scoped. */
21740 = ((cu->list_in_scope
21741 == cu->get_builder ()->get_file_symbols ())
21742 ? cu->get_builder ()->get_global_symbols ()
21743 : cu->list_in_scope);
21745 SYMBOL_ACLASS_INDEX (sym) = LOC_UNRESOLVED;
21747 else if (!die_is_declaration (die, cu))
21749 /* Use the default LOC_OPTIMIZED_OUT class. */
21750 gdb_assert (SYMBOL_CLASS (sym) == LOC_OPTIMIZED_OUT);
21752 list_to_add = cu->list_in_scope;
21756 case DW_TAG_formal_parameter:
21758 /* If we are inside a function, mark this as an argument. If
21759 not, we might be looking at an argument to an inlined function
21760 when we do not have enough information to show inlined frames;
21761 pretend it's a local variable in that case so that the user can
21763 struct context_stack *curr
21764 = cu->get_builder ()->get_current_context_stack ();
21765 if (curr != nullptr && curr->name != nullptr)
21766 SYMBOL_IS_ARGUMENT (sym) = 1;
21767 attr = dwarf2_attr (die, DW_AT_location, cu);
21770 var_decode_location (attr, sym, cu);
21772 attr = dwarf2_attr (die, DW_AT_const_value, cu);
21775 dwarf2_const_value (attr, sym, cu);
21778 list_to_add = cu->list_in_scope;
21781 case DW_TAG_unspecified_parameters:
21782 /* From varargs functions; gdb doesn't seem to have any
21783 interest in this information, so just ignore it for now.
21786 case DW_TAG_template_type_param:
21788 /* Fall through. */
21789 case DW_TAG_class_type:
21790 case DW_TAG_interface_type:
21791 case DW_TAG_structure_type:
21792 case DW_TAG_union_type:
21793 case DW_TAG_set_type:
21794 case DW_TAG_enumeration_type:
21795 SYMBOL_ACLASS_INDEX (sym) = LOC_TYPEDEF;
21796 SYMBOL_DOMAIN (sym) = STRUCT_DOMAIN;
21799 /* NOTE: carlton/2003-11-10: C++ class symbols shouldn't
21800 really ever be static objects: otherwise, if you try
21801 to, say, break of a class's method and you're in a file
21802 which doesn't mention that class, it won't work unless
21803 the check for all static symbols in lookup_symbol_aux
21804 saves you. See the OtherFileClass tests in
21805 gdb.c++/namespace.exp. */
21809 buildsym_compunit *builder = cu->get_builder ();
21811 = (cu->list_in_scope == builder->get_file_symbols ()
21812 && cu->language == language_cplus
21813 ? builder->get_global_symbols ()
21814 : cu->list_in_scope);
21816 /* The semantics of C++ state that "struct foo {
21817 ... }" also defines a typedef for "foo". */
21818 if (cu->language == language_cplus
21819 || cu->language == language_ada
21820 || cu->language == language_d
21821 || cu->language == language_rust)
21823 /* The symbol's name is already allocated along
21824 with this objfile, so we don't need to
21825 duplicate it for the type. */
21826 if (TYPE_NAME (SYMBOL_TYPE (sym)) == 0)
21827 TYPE_NAME (SYMBOL_TYPE (sym)) = SYMBOL_SEARCH_NAME (sym);
21832 case DW_TAG_typedef:
21833 SYMBOL_ACLASS_INDEX (sym) = LOC_TYPEDEF;
21834 SYMBOL_DOMAIN (sym) = VAR_DOMAIN;
21835 list_to_add = cu->list_in_scope;
21837 case DW_TAG_base_type:
21838 case DW_TAG_subrange_type:
21839 SYMBOL_ACLASS_INDEX (sym) = LOC_TYPEDEF;
21840 SYMBOL_DOMAIN (sym) = VAR_DOMAIN;
21841 list_to_add = cu->list_in_scope;
21843 case DW_TAG_enumerator:
21844 attr = dwarf2_attr (die, DW_AT_const_value, cu);
21847 dwarf2_const_value (attr, sym, cu);
21850 /* NOTE: carlton/2003-11-10: See comment above in the
21851 DW_TAG_class_type, etc. block. */
21854 = (cu->list_in_scope == cu->get_builder ()->get_file_symbols ()
21855 && cu->language == language_cplus
21856 ? cu->get_builder ()->get_global_symbols ()
21857 : cu->list_in_scope);
21860 case DW_TAG_imported_declaration:
21861 case DW_TAG_namespace:
21862 SYMBOL_ACLASS_INDEX (sym) = LOC_TYPEDEF;
21863 list_to_add = cu->get_builder ()->get_global_symbols ();
21865 case DW_TAG_module:
21866 SYMBOL_ACLASS_INDEX (sym) = LOC_TYPEDEF;
21867 SYMBOL_DOMAIN (sym) = MODULE_DOMAIN;
21868 list_to_add = cu->get_builder ()->get_global_symbols ();
21870 case DW_TAG_common_block:
21871 SYMBOL_ACLASS_INDEX (sym) = LOC_COMMON_BLOCK;
21872 SYMBOL_DOMAIN (sym) = COMMON_BLOCK_DOMAIN;
21873 add_symbol_to_list (sym, cu->list_in_scope);
21876 /* Not a tag we recognize. Hopefully we aren't processing
21877 trash data, but since we must specifically ignore things
21878 we don't recognize, there is nothing else we should do at
21880 complaint (_("unsupported tag: '%s'"),
21881 dwarf_tag_name (die->tag));
21887 sym->hash_next = objfile->template_symbols;
21888 objfile->template_symbols = sym;
21889 list_to_add = NULL;
21892 if (list_to_add != NULL)
21893 add_symbol_to_list (sym, list_to_add);
21895 /* For the benefit of old versions of GCC, check for anonymous
21896 namespaces based on the demangled name. */
21897 if (!cu->processing_has_namespace_info
21898 && cu->language == language_cplus)
21899 cp_scan_for_anonymous_namespaces (cu->get_builder (), sym, objfile);
21904 /* Given an attr with a DW_FORM_dataN value in host byte order,
21905 zero-extend it as appropriate for the symbol's type. The DWARF
21906 standard (v4) is not entirely clear about the meaning of using
21907 DW_FORM_dataN for a constant with a signed type, where the type is
21908 wider than the data. The conclusion of a discussion on the DWARF
21909 list was that this is unspecified. We choose to always zero-extend
21910 because that is the interpretation long in use by GCC. */
21913 dwarf2_const_value_data (const struct attribute *attr, struct obstack *obstack,
21914 struct dwarf2_cu *cu, LONGEST *value, int bits)
21916 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
21917 enum bfd_endian byte_order = bfd_big_endian (objfile->obfd) ?
21918 BFD_ENDIAN_BIG : BFD_ENDIAN_LITTLE;
21919 LONGEST l = DW_UNSND (attr);
21921 if (bits < sizeof (*value) * 8)
21923 l &= ((LONGEST) 1 << bits) - 1;
21926 else if (bits == sizeof (*value) * 8)
21930 gdb_byte *bytes = (gdb_byte *) obstack_alloc (obstack, bits / 8);
21931 store_unsigned_integer (bytes, bits / 8, byte_order, l);
21938 /* Read a constant value from an attribute. Either set *VALUE, or if
21939 the value does not fit in *VALUE, set *BYTES - either already
21940 allocated on the objfile obstack, or newly allocated on OBSTACK,
21941 or, set *BATON, if we translated the constant to a location
21945 dwarf2_const_value_attr (const struct attribute *attr, struct type *type,
21946 const char *name, struct obstack *obstack,
21947 struct dwarf2_cu *cu,
21948 LONGEST *value, const gdb_byte **bytes,
21949 struct dwarf2_locexpr_baton **baton)
21951 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
21952 struct comp_unit_head *cu_header = &cu->header;
21953 struct dwarf_block *blk;
21954 enum bfd_endian byte_order = (bfd_big_endian (objfile->obfd) ?
21955 BFD_ENDIAN_BIG : BFD_ENDIAN_LITTLE);
21961 switch (attr->form)
21964 case DW_FORM_addrx:
21965 case DW_FORM_GNU_addr_index:
21969 if (TYPE_LENGTH (type) != cu_header->addr_size)
21970 dwarf2_const_value_length_mismatch_complaint (name,
21971 cu_header->addr_size,
21972 TYPE_LENGTH (type));
21973 /* Symbols of this form are reasonably rare, so we just
21974 piggyback on the existing location code rather than writing
21975 a new implementation of symbol_computed_ops. */
21976 *baton = XOBNEW (obstack, struct dwarf2_locexpr_baton);
21977 (*baton)->per_cu = cu->per_cu;
21978 gdb_assert ((*baton)->per_cu);
21980 (*baton)->size = 2 + cu_header->addr_size;
21981 data = (gdb_byte *) obstack_alloc (obstack, (*baton)->size);
21982 (*baton)->data = data;
21984 data[0] = DW_OP_addr;
21985 store_unsigned_integer (&data[1], cu_header->addr_size,
21986 byte_order, DW_ADDR (attr));
21987 data[cu_header->addr_size + 1] = DW_OP_stack_value;
21990 case DW_FORM_string:
21993 case DW_FORM_GNU_str_index:
21994 case DW_FORM_GNU_strp_alt:
21995 /* DW_STRING is already allocated on the objfile obstack, point
21997 *bytes = (const gdb_byte *) DW_STRING (attr);
21999 case DW_FORM_block1:
22000 case DW_FORM_block2:
22001 case DW_FORM_block4:
22002 case DW_FORM_block:
22003 case DW_FORM_exprloc:
22004 case DW_FORM_data16:
22005 blk = DW_BLOCK (attr);
22006 if (TYPE_LENGTH (type) != blk->size)
22007 dwarf2_const_value_length_mismatch_complaint (name, blk->size,
22008 TYPE_LENGTH (type));
22009 *bytes = blk->data;
22012 /* The DW_AT_const_value attributes are supposed to carry the
22013 symbol's value "represented as it would be on the target
22014 architecture." By the time we get here, it's already been
22015 converted to host endianness, so we just need to sign- or
22016 zero-extend it as appropriate. */
22017 case DW_FORM_data1:
22018 *bytes = dwarf2_const_value_data (attr, obstack, cu, value, 8);
22020 case DW_FORM_data2:
22021 *bytes = dwarf2_const_value_data (attr, obstack, cu, value, 16);
22023 case DW_FORM_data4:
22024 *bytes = dwarf2_const_value_data (attr, obstack, cu, value, 32);
22026 case DW_FORM_data8:
22027 *bytes = dwarf2_const_value_data (attr, obstack, cu, value, 64);
22030 case DW_FORM_sdata:
22031 case DW_FORM_implicit_const:
22032 *value = DW_SND (attr);
22035 case DW_FORM_udata:
22036 *value = DW_UNSND (attr);
22040 complaint (_("unsupported const value attribute form: '%s'"),
22041 dwarf_form_name (attr->form));
22048 /* Copy constant value from an attribute to a symbol. */
22051 dwarf2_const_value (const struct attribute *attr, struct symbol *sym,
22052 struct dwarf2_cu *cu)
22054 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
22056 const gdb_byte *bytes;
22057 struct dwarf2_locexpr_baton *baton;
22059 dwarf2_const_value_attr (attr, SYMBOL_TYPE (sym),
22060 SYMBOL_PRINT_NAME (sym),
22061 &objfile->objfile_obstack, cu,
22062 &value, &bytes, &baton);
22066 SYMBOL_LOCATION_BATON (sym) = baton;
22067 SYMBOL_ACLASS_INDEX (sym) = dwarf2_locexpr_index;
22069 else if (bytes != NULL)
22071 SYMBOL_VALUE_BYTES (sym) = bytes;
22072 SYMBOL_ACLASS_INDEX (sym) = LOC_CONST_BYTES;
22076 SYMBOL_VALUE (sym) = value;
22077 SYMBOL_ACLASS_INDEX (sym) = LOC_CONST;
22081 /* Return the type of the die in question using its DW_AT_type attribute. */
22083 static struct type *
22084 die_type (struct die_info *die, struct dwarf2_cu *cu)
22086 struct attribute *type_attr;
22088 type_attr = dwarf2_attr (die, DW_AT_type, cu);
22091 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
22092 /* A missing DW_AT_type represents a void type. */
22093 return objfile_type (objfile)->builtin_void;
22096 return lookup_die_type (die, type_attr, cu);
22099 /* True iff CU's producer generates GNAT Ada auxiliary information
22100 that allows to find parallel types through that information instead
22101 of having to do expensive parallel lookups by type name. */
22104 need_gnat_info (struct dwarf2_cu *cu)
22106 /* Assume that the Ada compiler was GNAT, which always produces
22107 the auxiliary information. */
22108 return (cu->language == language_ada);
22111 /* Return the auxiliary type of the die in question using its
22112 DW_AT_GNAT_descriptive_type attribute. Returns NULL if the
22113 attribute is not present. */
22115 static struct type *
22116 die_descriptive_type (struct die_info *die, struct dwarf2_cu *cu)
22118 struct attribute *type_attr;
22120 type_attr = dwarf2_attr (die, DW_AT_GNAT_descriptive_type, cu);
22124 return lookup_die_type (die, type_attr, cu);
22127 /* If DIE has a descriptive_type attribute, then set the TYPE's
22128 descriptive type accordingly. */
22131 set_descriptive_type (struct type *type, struct die_info *die,
22132 struct dwarf2_cu *cu)
22134 struct type *descriptive_type = die_descriptive_type (die, cu);
22136 if (descriptive_type)
22138 ALLOCATE_GNAT_AUX_TYPE (type);
22139 TYPE_DESCRIPTIVE_TYPE (type) = descriptive_type;
22143 /* Return the containing type of the die in question using its
22144 DW_AT_containing_type attribute. */
22146 static struct type *
22147 die_containing_type (struct die_info *die, struct dwarf2_cu *cu)
22149 struct attribute *type_attr;
22150 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
22152 type_attr = dwarf2_attr (die, DW_AT_containing_type, cu);
22154 error (_("Dwarf Error: Problem turning containing type into gdb type "
22155 "[in module %s]"), objfile_name (objfile));
22157 return lookup_die_type (die, type_attr, cu);
22160 /* Return an error marker type to use for the ill formed type in DIE/CU. */
22162 static struct type *
22163 build_error_marker_type (struct dwarf2_cu *cu, struct die_info *die)
22165 struct dwarf2_per_objfile *dwarf2_per_objfile
22166 = cu->per_cu->dwarf2_per_objfile;
22167 struct objfile *objfile = dwarf2_per_objfile->objfile;
22170 std::string message
22171 = string_printf (_("<unknown type in %s, CU %s, DIE %s>"),
22172 objfile_name (objfile),
22173 sect_offset_str (cu->header.sect_off),
22174 sect_offset_str (die->sect_off));
22175 saved = (char *) obstack_copy0 (&objfile->objfile_obstack,
22176 message.c_str (), message.length ());
22178 return init_type (objfile, TYPE_CODE_ERROR, 0, saved);
22181 /* Look up the type of DIE in CU using its type attribute ATTR.
22182 ATTR must be one of: DW_AT_type, DW_AT_GNAT_descriptive_type,
22183 DW_AT_containing_type.
22184 If there is no type substitute an error marker. */
22186 static struct type *
22187 lookup_die_type (struct die_info *die, const struct attribute *attr,
22188 struct dwarf2_cu *cu)
22190 struct dwarf2_per_objfile *dwarf2_per_objfile
22191 = cu->per_cu->dwarf2_per_objfile;
22192 struct objfile *objfile = dwarf2_per_objfile->objfile;
22193 struct type *this_type;
22195 gdb_assert (attr->name == DW_AT_type
22196 || attr->name == DW_AT_GNAT_descriptive_type
22197 || attr->name == DW_AT_containing_type);
22199 /* First see if we have it cached. */
22201 if (attr->form == DW_FORM_GNU_ref_alt)
22203 struct dwarf2_per_cu_data *per_cu;
22204 sect_offset sect_off = dwarf2_get_ref_die_offset (attr);
22206 per_cu = dwarf2_find_containing_comp_unit (sect_off, 1,
22207 dwarf2_per_objfile);
22208 this_type = get_die_type_at_offset (sect_off, per_cu);
22210 else if (attr_form_is_ref (attr))
22212 sect_offset sect_off = dwarf2_get_ref_die_offset (attr);
22214 this_type = get_die_type_at_offset (sect_off, cu->per_cu);
22216 else if (attr->form == DW_FORM_ref_sig8)
22218 ULONGEST signature = DW_SIGNATURE (attr);
22220 return get_signatured_type (die, signature, cu);
22224 complaint (_("Dwarf Error: Bad type attribute %s in DIE"
22225 " at %s [in module %s]"),
22226 dwarf_attr_name (attr->name), sect_offset_str (die->sect_off),
22227 objfile_name (objfile));
22228 return build_error_marker_type (cu, die);
22231 /* If not cached we need to read it in. */
22233 if (this_type == NULL)
22235 struct die_info *type_die = NULL;
22236 struct dwarf2_cu *type_cu = cu;
22238 if (attr_form_is_ref (attr))
22239 type_die = follow_die_ref (die, attr, &type_cu);
22240 if (type_die == NULL)
22241 return build_error_marker_type (cu, die);
22242 /* If we find the type now, it's probably because the type came
22243 from an inter-CU reference and the type's CU got expanded before
22245 this_type = read_type_die (type_die, type_cu);
22248 /* If we still don't have a type use an error marker. */
22250 if (this_type == NULL)
22251 return build_error_marker_type (cu, die);
22256 /* Return the type in DIE, CU.
22257 Returns NULL for invalid types.
22259 This first does a lookup in die_type_hash,
22260 and only reads the die in if necessary.
22262 NOTE: This can be called when reading in partial or full symbols. */
22264 static struct type *
22265 read_type_die (struct die_info *die, struct dwarf2_cu *cu)
22267 struct type *this_type;
22269 this_type = get_die_type (die, cu);
22273 return read_type_die_1 (die, cu);
22276 /* Read the type in DIE, CU.
22277 Returns NULL for invalid types. */
22279 static struct type *
22280 read_type_die_1 (struct die_info *die, struct dwarf2_cu *cu)
22282 struct type *this_type = NULL;
22286 case DW_TAG_class_type:
22287 case DW_TAG_interface_type:
22288 case DW_TAG_structure_type:
22289 case DW_TAG_union_type:
22290 this_type = read_structure_type (die, cu);
22292 case DW_TAG_enumeration_type:
22293 this_type = read_enumeration_type (die, cu);
22295 case DW_TAG_subprogram:
22296 case DW_TAG_subroutine_type:
22297 case DW_TAG_inlined_subroutine:
22298 this_type = read_subroutine_type (die, cu);
22300 case DW_TAG_array_type:
22301 this_type = read_array_type (die, cu);
22303 case DW_TAG_set_type:
22304 this_type = read_set_type (die, cu);
22306 case DW_TAG_pointer_type:
22307 this_type = read_tag_pointer_type (die, cu);
22309 case DW_TAG_ptr_to_member_type:
22310 this_type = read_tag_ptr_to_member_type (die, cu);
22312 case DW_TAG_reference_type:
22313 this_type = read_tag_reference_type (die, cu, TYPE_CODE_REF);
22315 case DW_TAG_rvalue_reference_type:
22316 this_type = read_tag_reference_type (die, cu, TYPE_CODE_RVALUE_REF);
22318 case DW_TAG_const_type:
22319 this_type = read_tag_const_type (die, cu);
22321 case DW_TAG_volatile_type:
22322 this_type = read_tag_volatile_type (die, cu);
22324 case DW_TAG_restrict_type:
22325 this_type = read_tag_restrict_type (die, cu);
22327 case DW_TAG_string_type:
22328 this_type = read_tag_string_type (die, cu);
22330 case DW_TAG_typedef:
22331 this_type = read_typedef (die, cu);
22333 case DW_TAG_subrange_type:
22334 this_type = read_subrange_type (die, cu);
22336 case DW_TAG_base_type:
22337 this_type = read_base_type (die, cu);
22339 case DW_TAG_unspecified_type:
22340 this_type = read_unspecified_type (die, cu);
22342 case DW_TAG_namespace:
22343 this_type = read_namespace_type (die, cu);
22345 case DW_TAG_module:
22346 this_type = read_module_type (die, cu);
22348 case DW_TAG_atomic_type:
22349 this_type = read_tag_atomic_type (die, cu);
22352 complaint (_("unexpected tag in read_type_die: '%s'"),
22353 dwarf_tag_name (die->tag));
22360 /* See if we can figure out if the class lives in a namespace. We do
22361 this by looking for a member function; its demangled name will
22362 contain namespace info, if there is any.
22363 Return the computed name or NULL.
22364 Space for the result is allocated on the objfile's obstack.
22365 This is the full-die version of guess_partial_die_structure_name.
22366 In this case we know DIE has no useful parent. */
22369 guess_full_die_structure_name (struct die_info *die, struct dwarf2_cu *cu)
22371 struct die_info *spec_die;
22372 struct dwarf2_cu *spec_cu;
22373 struct die_info *child;
22374 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
22377 spec_die = die_specification (die, &spec_cu);
22378 if (spec_die != NULL)
22384 for (child = die->child;
22386 child = child->sibling)
22388 if (child->tag == DW_TAG_subprogram)
22390 const char *linkage_name = dw2_linkage_name (child, cu);
22392 if (linkage_name != NULL)
22395 = language_class_name_from_physname (cu->language_defn,
22399 if (actual_name != NULL)
22401 const char *die_name = dwarf2_name (die, cu);
22403 if (die_name != NULL
22404 && strcmp (die_name, actual_name) != 0)
22406 /* Strip off the class name from the full name.
22407 We want the prefix. */
22408 int die_name_len = strlen (die_name);
22409 int actual_name_len = strlen (actual_name);
22411 /* Test for '::' as a sanity check. */
22412 if (actual_name_len > die_name_len + 2
22413 && actual_name[actual_name_len
22414 - die_name_len - 1] == ':')
22415 name = (char *) obstack_copy0 (
22416 &objfile->per_bfd->storage_obstack,
22417 actual_name, actual_name_len - die_name_len - 2);
22420 xfree (actual_name);
22429 /* GCC might emit a nameless typedef that has a linkage name. Determine the
22430 prefix part in such case. See
22431 http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47510. */
22433 static const char *
22434 anonymous_struct_prefix (struct die_info *die, struct dwarf2_cu *cu)
22436 struct attribute *attr;
22439 if (die->tag != DW_TAG_class_type && die->tag != DW_TAG_interface_type
22440 && die->tag != DW_TAG_structure_type && die->tag != DW_TAG_union_type)
22443 if (dwarf2_string_attr (die, DW_AT_name, cu) != NULL)
22446 attr = dw2_linkage_name_attr (die, cu);
22447 if (attr == NULL || DW_STRING (attr) == NULL)
22450 /* dwarf2_name had to be already called. */
22451 gdb_assert (DW_STRING_IS_CANONICAL (attr));
22453 /* Strip the base name, keep any leading namespaces/classes. */
22454 base = strrchr (DW_STRING (attr), ':');
22455 if (base == NULL || base == DW_STRING (attr) || base[-1] != ':')
22458 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
22459 return (char *) obstack_copy0 (&objfile->per_bfd->storage_obstack,
22461 &base[-1] - DW_STRING (attr));
22464 /* Return the name of the namespace/class that DIE is defined within,
22465 or "" if we can't tell. The caller should not xfree the result.
22467 For example, if we're within the method foo() in the following
22477 then determine_prefix on foo's die will return "N::C". */
22479 static const char *
22480 determine_prefix (struct die_info *die, struct dwarf2_cu *cu)
22482 struct dwarf2_per_objfile *dwarf2_per_objfile
22483 = cu->per_cu->dwarf2_per_objfile;
22484 struct die_info *parent, *spec_die;
22485 struct dwarf2_cu *spec_cu;
22486 struct type *parent_type;
22487 const char *retval;
22489 if (cu->language != language_cplus
22490 && cu->language != language_fortran && cu->language != language_d
22491 && cu->language != language_rust)
22494 retval = anonymous_struct_prefix (die, cu);
22498 /* We have to be careful in the presence of DW_AT_specification.
22499 For example, with GCC 3.4, given the code
22503 // Definition of N::foo.
22507 then we'll have a tree of DIEs like this:
22509 1: DW_TAG_compile_unit
22510 2: DW_TAG_namespace // N
22511 3: DW_TAG_subprogram // declaration of N::foo
22512 4: DW_TAG_subprogram // definition of N::foo
22513 DW_AT_specification // refers to die #3
22515 Thus, when processing die #4, we have to pretend that we're in
22516 the context of its DW_AT_specification, namely the contex of die
22519 spec_die = die_specification (die, &spec_cu);
22520 if (spec_die == NULL)
22521 parent = die->parent;
22524 parent = spec_die->parent;
22528 if (parent == NULL)
22530 else if (parent->building_fullname)
22533 const char *parent_name;
22535 /* It has been seen on RealView 2.2 built binaries,
22536 DW_TAG_template_type_param types actually _defined_ as
22537 children of the parent class:
22540 template class <class Enum> Class{};
22541 Class<enum E> class_e;
22543 1: DW_TAG_class_type (Class)
22544 2: DW_TAG_enumeration_type (E)
22545 3: DW_TAG_enumerator (enum1:0)
22546 3: DW_TAG_enumerator (enum2:1)
22548 2: DW_TAG_template_type_param
22549 DW_AT_type DW_FORM_ref_udata (E)
22551 Besides being broken debug info, it can put GDB into an
22552 infinite loop. Consider:
22554 When we're building the full name for Class<E>, we'll start
22555 at Class, and go look over its template type parameters,
22556 finding E. We'll then try to build the full name of E, and
22557 reach here. We're now trying to build the full name of E,
22558 and look over the parent DIE for containing scope. In the
22559 broken case, if we followed the parent DIE of E, we'd again
22560 find Class, and once again go look at its template type
22561 arguments, etc., etc. Simply don't consider such parent die
22562 as source-level parent of this die (it can't be, the language
22563 doesn't allow it), and break the loop here. */
22564 name = dwarf2_name (die, cu);
22565 parent_name = dwarf2_name (parent, cu);
22566 complaint (_("template param type '%s' defined within parent '%s'"),
22567 name ? name : "<unknown>",
22568 parent_name ? parent_name : "<unknown>");
22572 switch (parent->tag)
22574 case DW_TAG_namespace:
22575 parent_type = read_type_die (parent, cu);
22576 /* GCC 4.0 and 4.1 had a bug (PR c++/28460) where they generated bogus
22577 DW_TAG_namespace DIEs with a name of "::" for the global namespace.
22578 Work around this problem here. */
22579 if (cu->language == language_cplus
22580 && strcmp (TYPE_NAME (parent_type), "::") == 0)
22582 /* We give a name to even anonymous namespaces. */
22583 return TYPE_NAME (parent_type);
22584 case DW_TAG_class_type:
22585 case DW_TAG_interface_type:
22586 case DW_TAG_structure_type:
22587 case DW_TAG_union_type:
22588 case DW_TAG_module:
22589 parent_type = read_type_die (parent, cu);
22590 if (TYPE_NAME (parent_type) != NULL)
22591 return TYPE_NAME (parent_type);
22593 /* An anonymous structure is only allowed non-static data
22594 members; no typedefs, no member functions, et cetera.
22595 So it does not need a prefix. */
22597 case DW_TAG_compile_unit:
22598 case DW_TAG_partial_unit:
22599 /* gcc-4.5 -gdwarf-4 can drop the enclosing namespace. Cope. */
22600 if (cu->language == language_cplus
22601 && !VEC_empty (dwarf2_section_info_def, dwarf2_per_objfile->types)
22602 && die->child != NULL
22603 && (die->tag == DW_TAG_class_type
22604 || die->tag == DW_TAG_structure_type
22605 || die->tag == DW_TAG_union_type))
22607 char *name = guess_full_die_structure_name (die, cu);
22612 case DW_TAG_enumeration_type:
22613 parent_type = read_type_die (parent, cu);
22614 if (TYPE_DECLARED_CLASS (parent_type))
22616 if (TYPE_NAME (parent_type) != NULL)
22617 return TYPE_NAME (parent_type);
22620 /* Fall through. */
22622 return determine_prefix (parent, cu);
22626 /* Return a newly-allocated string formed by concatenating PREFIX and SUFFIX
22627 with appropriate separator. If PREFIX or SUFFIX is NULL or empty, then
22628 simply copy the SUFFIX or PREFIX, respectively. If OBS is non-null, perform
22629 an obconcat, otherwise allocate storage for the result. The CU argument is
22630 used to determine the language and hence, the appropriate separator. */
22632 #define MAX_SEP_LEN 7 /* strlen ("__") + strlen ("_MOD_") */
22635 typename_concat (struct obstack *obs, const char *prefix, const char *suffix,
22636 int physname, struct dwarf2_cu *cu)
22638 const char *lead = "";
22641 if (suffix == NULL || suffix[0] == '\0'
22642 || prefix == NULL || prefix[0] == '\0')
22644 else if (cu->language == language_d)
22646 /* For D, the 'main' function could be defined in any module, but it
22647 should never be prefixed. */
22648 if (strcmp (suffix, "D main") == 0)
22656 else if (cu->language == language_fortran && physname)
22658 /* This is gfortran specific mangling. Normally DW_AT_linkage_name or
22659 DW_AT_MIPS_linkage_name is preferred and used instead. */
22667 if (prefix == NULL)
22669 if (suffix == NULL)
22676 xmalloc (strlen (prefix) + MAX_SEP_LEN + strlen (suffix) + 1));
22678 strcpy (retval, lead);
22679 strcat (retval, prefix);
22680 strcat (retval, sep);
22681 strcat (retval, suffix);
22686 /* We have an obstack. */
22687 return obconcat (obs, lead, prefix, sep, suffix, (char *) NULL);
22691 /* Return sibling of die, NULL if no sibling. */
22693 static struct die_info *
22694 sibling_die (struct die_info *die)
22696 return die->sibling;
22699 /* Get name of a die, return NULL if not found. */
22701 static const char *
22702 dwarf2_canonicalize_name (const char *name, struct dwarf2_cu *cu,
22703 struct obstack *obstack)
22705 if (name && cu->language == language_cplus)
22707 std::string canon_name = cp_canonicalize_string (name);
22709 if (!canon_name.empty ())
22711 if (canon_name != name)
22712 name = (const char *) obstack_copy0 (obstack,
22713 canon_name.c_str (),
22714 canon_name.length ());
22721 /* Get name of a die, return NULL if not found.
22722 Anonymous namespaces are converted to their magic string. */
22724 static const char *
22725 dwarf2_name (struct die_info *die, struct dwarf2_cu *cu)
22727 struct attribute *attr;
22728 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
22730 attr = dwarf2_attr (die, DW_AT_name, cu);
22731 if ((!attr || !DW_STRING (attr))
22732 && die->tag != DW_TAG_namespace
22733 && die->tag != DW_TAG_class_type
22734 && die->tag != DW_TAG_interface_type
22735 && die->tag != DW_TAG_structure_type
22736 && die->tag != DW_TAG_union_type)
22741 case DW_TAG_compile_unit:
22742 case DW_TAG_partial_unit:
22743 /* Compilation units have a DW_AT_name that is a filename, not
22744 a source language identifier. */
22745 case DW_TAG_enumeration_type:
22746 case DW_TAG_enumerator:
22747 /* These tags always have simple identifiers already; no need
22748 to canonicalize them. */
22749 return DW_STRING (attr);
22751 case DW_TAG_namespace:
22752 if (attr != NULL && DW_STRING (attr) != NULL)
22753 return DW_STRING (attr);
22754 return CP_ANONYMOUS_NAMESPACE_STR;
22756 case DW_TAG_class_type:
22757 case DW_TAG_interface_type:
22758 case DW_TAG_structure_type:
22759 case DW_TAG_union_type:
22760 /* Some GCC versions emit spurious DW_AT_name attributes for unnamed
22761 structures or unions. These were of the form "._%d" in GCC 4.1,
22762 or simply "<anonymous struct>" or "<anonymous union>" in GCC 4.3
22763 and GCC 4.4. We work around this problem by ignoring these. */
22764 if (attr && DW_STRING (attr)
22765 && (startswith (DW_STRING (attr), "._")
22766 || startswith (DW_STRING (attr), "<anonymous")))
22769 /* GCC might emit a nameless typedef that has a linkage name. See
22770 http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47510. */
22771 if (!attr || DW_STRING (attr) == NULL)
22773 char *demangled = NULL;
22775 attr = dw2_linkage_name_attr (die, cu);
22776 if (attr == NULL || DW_STRING (attr) == NULL)
22779 /* Avoid demangling DW_STRING (attr) the second time on a second
22780 call for the same DIE. */
22781 if (!DW_STRING_IS_CANONICAL (attr))
22782 demangled = gdb_demangle (DW_STRING (attr), DMGL_TYPES);
22788 /* FIXME: we already did this for the partial symbol... */
22791 obstack_copy0 (&objfile->per_bfd->storage_obstack,
22792 demangled, strlen (demangled)));
22793 DW_STRING_IS_CANONICAL (attr) = 1;
22796 /* Strip any leading namespaces/classes, keep only the base name.
22797 DW_AT_name for named DIEs does not contain the prefixes. */
22798 base = strrchr (DW_STRING (attr), ':');
22799 if (base && base > DW_STRING (attr) && base[-1] == ':')
22802 return DW_STRING (attr);
22811 if (!DW_STRING_IS_CANONICAL (attr))
22814 = dwarf2_canonicalize_name (DW_STRING (attr), cu,
22815 &objfile->per_bfd->storage_obstack);
22816 DW_STRING_IS_CANONICAL (attr) = 1;
22818 return DW_STRING (attr);
22821 /* Return the die that this die in an extension of, or NULL if there
22822 is none. *EXT_CU is the CU containing DIE on input, and the CU
22823 containing the return value on output. */
22825 static struct die_info *
22826 dwarf2_extension (struct die_info *die, struct dwarf2_cu **ext_cu)
22828 struct attribute *attr;
22830 attr = dwarf2_attr (die, DW_AT_extension, *ext_cu);
22834 return follow_die_ref (die, attr, ext_cu);
22837 /* A convenience function that returns an "unknown" DWARF name,
22838 including the value of V. STR is the name of the entity being
22839 printed, e.g., "TAG". */
22841 static const char *
22842 dwarf_unknown (const char *str, unsigned v)
22844 char *cell = get_print_cell ();
22845 xsnprintf (cell, PRINT_CELL_SIZE, "DW_%s_<unknown: %u>", str, v);
22849 /* Convert a DIE tag into its string name. */
22851 static const char *
22852 dwarf_tag_name (unsigned tag)
22854 const char *name = get_DW_TAG_name (tag);
22857 return dwarf_unknown ("TAG", tag);
22862 /* Convert a DWARF attribute code into its string name. */
22864 static const char *
22865 dwarf_attr_name (unsigned attr)
22869 #ifdef MIPS /* collides with DW_AT_HP_block_index */
22870 if (attr == DW_AT_MIPS_fde)
22871 return "DW_AT_MIPS_fde";
22873 if (attr == DW_AT_HP_block_index)
22874 return "DW_AT_HP_block_index";
22877 name = get_DW_AT_name (attr);
22880 return dwarf_unknown ("AT", attr);
22885 /* Convert a DWARF value form code into its string name. */
22887 static const char *
22888 dwarf_form_name (unsigned form)
22890 const char *name = get_DW_FORM_name (form);
22893 return dwarf_unknown ("FORM", form);
22898 static const char *
22899 dwarf_bool_name (unsigned mybool)
22907 /* Convert a DWARF type code into its string name. */
22909 static const char *
22910 dwarf_type_encoding_name (unsigned enc)
22912 const char *name = get_DW_ATE_name (enc);
22915 return dwarf_unknown ("ATE", enc);
22921 dump_die_shallow (struct ui_file *f, int indent, struct die_info *die)
22925 print_spaces (indent, f);
22926 fprintf_unfiltered (f, "Die: %s (abbrev %d, offset %s)\n",
22927 dwarf_tag_name (die->tag), die->abbrev,
22928 sect_offset_str (die->sect_off));
22930 if (die->parent != NULL)
22932 print_spaces (indent, f);
22933 fprintf_unfiltered (f, " parent at offset: %s\n",
22934 sect_offset_str (die->parent->sect_off));
22937 print_spaces (indent, f);
22938 fprintf_unfiltered (f, " has children: %s\n",
22939 dwarf_bool_name (die->child != NULL));
22941 print_spaces (indent, f);
22942 fprintf_unfiltered (f, " attributes:\n");
22944 for (i = 0; i < die->num_attrs; ++i)
22946 print_spaces (indent, f);
22947 fprintf_unfiltered (f, " %s (%s) ",
22948 dwarf_attr_name (die->attrs[i].name),
22949 dwarf_form_name (die->attrs[i].form));
22951 switch (die->attrs[i].form)
22954 case DW_FORM_addrx:
22955 case DW_FORM_GNU_addr_index:
22956 fprintf_unfiltered (f, "address: ");
22957 fputs_filtered (hex_string (DW_ADDR (&die->attrs[i])), f);
22959 case DW_FORM_block2:
22960 case DW_FORM_block4:
22961 case DW_FORM_block:
22962 case DW_FORM_block1:
22963 fprintf_unfiltered (f, "block: size %s",
22964 pulongest (DW_BLOCK (&die->attrs[i])->size));
22966 case DW_FORM_exprloc:
22967 fprintf_unfiltered (f, "expression: size %s",
22968 pulongest (DW_BLOCK (&die->attrs[i])->size));
22970 case DW_FORM_data16:
22971 fprintf_unfiltered (f, "constant of 16 bytes");
22973 case DW_FORM_ref_addr:
22974 fprintf_unfiltered (f, "ref address: ");
22975 fputs_filtered (hex_string (DW_UNSND (&die->attrs[i])), f);
22977 case DW_FORM_GNU_ref_alt:
22978 fprintf_unfiltered (f, "alt ref address: ");
22979 fputs_filtered (hex_string (DW_UNSND (&die->attrs[i])), f);
22985 case DW_FORM_ref_udata:
22986 fprintf_unfiltered (f, "constant ref: 0x%lx (adjusted)",
22987 (long) (DW_UNSND (&die->attrs[i])));
22989 case DW_FORM_data1:
22990 case DW_FORM_data2:
22991 case DW_FORM_data4:
22992 case DW_FORM_data8:
22993 case DW_FORM_udata:
22994 case DW_FORM_sdata:
22995 fprintf_unfiltered (f, "constant: %s",
22996 pulongest (DW_UNSND (&die->attrs[i])));
22998 case DW_FORM_sec_offset:
22999 fprintf_unfiltered (f, "section offset: %s",
23000 pulongest (DW_UNSND (&die->attrs[i])));
23002 case DW_FORM_ref_sig8:
23003 fprintf_unfiltered (f, "signature: %s",
23004 hex_string (DW_SIGNATURE (&die->attrs[i])));
23006 case DW_FORM_string:
23008 case DW_FORM_line_strp:
23010 case DW_FORM_GNU_str_index:
23011 case DW_FORM_GNU_strp_alt:
23012 fprintf_unfiltered (f, "string: \"%s\" (%s canonicalized)",
23013 DW_STRING (&die->attrs[i])
23014 ? DW_STRING (&die->attrs[i]) : "",
23015 DW_STRING_IS_CANONICAL (&die->attrs[i]) ? "is" : "not");
23018 if (DW_UNSND (&die->attrs[i]))
23019 fprintf_unfiltered (f, "flag: TRUE");
23021 fprintf_unfiltered (f, "flag: FALSE");
23023 case DW_FORM_flag_present:
23024 fprintf_unfiltered (f, "flag: TRUE");
23026 case DW_FORM_indirect:
23027 /* The reader will have reduced the indirect form to
23028 the "base form" so this form should not occur. */
23029 fprintf_unfiltered (f,
23030 "unexpected attribute form: DW_FORM_indirect");
23032 case DW_FORM_implicit_const:
23033 fprintf_unfiltered (f, "constant: %s",
23034 plongest (DW_SND (&die->attrs[i])));
23037 fprintf_unfiltered (f, "unsupported attribute form: %d.",
23038 die->attrs[i].form);
23041 fprintf_unfiltered (f, "\n");
23046 dump_die_for_error (struct die_info *die)
23048 dump_die_shallow (gdb_stderr, 0, die);
23052 dump_die_1 (struct ui_file *f, int level, int max_level, struct die_info *die)
23054 int indent = level * 4;
23056 gdb_assert (die != NULL);
23058 if (level >= max_level)
23061 dump_die_shallow (f, indent, die);
23063 if (die->child != NULL)
23065 print_spaces (indent, f);
23066 fprintf_unfiltered (f, " Children:");
23067 if (level + 1 < max_level)
23069 fprintf_unfiltered (f, "\n");
23070 dump_die_1 (f, level + 1, max_level, die->child);
23074 fprintf_unfiltered (f,
23075 " [not printed, max nesting level reached]\n");
23079 if (die->sibling != NULL && level > 0)
23081 dump_die_1 (f, level, max_level, die->sibling);
23085 /* This is called from the pdie macro in gdbinit.in.
23086 It's not static so gcc will keep a copy callable from gdb. */
23089 dump_die (struct die_info *die, int max_level)
23091 dump_die_1 (gdb_stdlog, 0, max_level, die);
23095 store_in_ref_table (struct die_info *die, struct dwarf2_cu *cu)
23099 slot = htab_find_slot_with_hash (cu->die_hash, die,
23100 to_underlying (die->sect_off),
23106 /* Return DIE offset of ATTR. Return 0 with complaint if ATTR is not of the
23110 dwarf2_get_ref_die_offset (const struct attribute *attr)
23112 if (attr_form_is_ref (attr))
23113 return (sect_offset) DW_UNSND (attr);
23115 complaint (_("unsupported die ref attribute form: '%s'"),
23116 dwarf_form_name (attr->form));
23120 /* Return the constant value held by ATTR. Return DEFAULT_VALUE if
23121 * the value held by the attribute is not constant. */
23124 dwarf2_get_attr_constant_value (const struct attribute *attr, int default_value)
23126 if (attr->form == DW_FORM_sdata || attr->form == DW_FORM_implicit_const)
23127 return DW_SND (attr);
23128 else if (attr->form == DW_FORM_udata
23129 || attr->form == DW_FORM_data1
23130 || attr->form == DW_FORM_data2
23131 || attr->form == DW_FORM_data4
23132 || attr->form == DW_FORM_data8)
23133 return DW_UNSND (attr);
23136 /* For DW_FORM_data16 see attr_form_is_constant. */
23137 complaint (_("Attribute value is not a constant (%s)"),
23138 dwarf_form_name (attr->form));
23139 return default_value;
23143 /* Follow reference or signature attribute ATTR of SRC_DIE.
23144 On entry *REF_CU is the CU of SRC_DIE.
23145 On exit *REF_CU is the CU of the result. */
23147 static struct die_info *
23148 follow_die_ref_or_sig (struct die_info *src_die, const struct attribute *attr,
23149 struct dwarf2_cu **ref_cu)
23151 struct die_info *die;
23153 if (attr_form_is_ref (attr))
23154 die = follow_die_ref (src_die, attr, ref_cu);
23155 else if (attr->form == DW_FORM_ref_sig8)
23156 die = follow_die_sig (src_die, attr, ref_cu);
23159 dump_die_for_error (src_die);
23160 error (_("Dwarf Error: Expected reference attribute [in module %s]"),
23161 objfile_name ((*ref_cu)->per_cu->dwarf2_per_objfile->objfile));
23167 /* Follow reference OFFSET.
23168 On entry *REF_CU is the CU of the source die referencing OFFSET.
23169 On exit *REF_CU is the CU of the result.
23170 Returns NULL if OFFSET is invalid. */
23172 static struct die_info *
23173 follow_die_offset (sect_offset sect_off, int offset_in_dwz,
23174 struct dwarf2_cu **ref_cu)
23176 struct die_info temp_die;
23177 struct dwarf2_cu *target_cu, *cu = *ref_cu;
23178 struct dwarf2_per_objfile *dwarf2_per_objfile
23179 = cu->per_cu->dwarf2_per_objfile;
23181 gdb_assert (cu->per_cu != NULL);
23185 if (cu->per_cu->is_debug_types)
23187 /* .debug_types CUs cannot reference anything outside their CU.
23188 If they need to, they have to reference a signatured type via
23189 DW_FORM_ref_sig8. */
23190 if (!offset_in_cu_p (&cu->header, sect_off))
23193 else if (offset_in_dwz != cu->per_cu->is_dwz
23194 || !offset_in_cu_p (&cu->header, sect_off))
23196 struct dwarf2_per_cu_data *per_cu;
23198 per_cu = dwarf2_find_containing_comp_unit (sect_off, offset_in_dwz,
23199 dwarf2_per_objfile);
23201 /* If necessary, add it to the queue and load its DIEs. */
23202 if (maybe_queue_comp_unit (cu, per_cu, cu->language))
23203 load_full_comp_unit (per_cu, false, cu->language);
23205 target_cu = per_cu->cu;
23207 else if (cu->dies == NULL)
23209 /* We're loading full DIEs during partial symbol reading. */
23210 gdb_assert (dwarf2_per_objfile->reading_partial_symbols);
23211 load_full_comp_unit (cu->per_cu, false, language_minimal);
23214 *ref_cu = target_cu;
23215 temp_die.sect_off = sect_off;
23217 if (target_cu != cu)
23218 target_cu->ancestor = cu;
23220 return (struct die_info *) htab_find_with_hash (target_cu->die_hash,
23222 to_underlying (sect_off));
23225 /* Follow reference attribute ATTR of SRC_DIE.
23226 On entry *REF_CU is the CU of SRC_DIE.
23227 On exit *REF_CU is the CU of the result. */
23229 static struct die_info *
23230 follow_die_ref (struct die_info *src_die, const struct attribute *attr,
23231 struct dwarf2_cu **ref_cu)
23233 sect_offset sect_off = dwarf2_get_ref_die_offset (attr);
23234 struct dwarf2_cu *cu = *ref_cu;
23235 struct die_info *die;
23237 die = follow_die_offset (sect_off,
23238 (attr->form == DW_FORM_GNU_ref_alt
23239 || cu->per_cu->is_dwz),
23242 error (_("Dwarf Error: Cannot find DIE at %s referenced from DIE "
23243 "at %s [in module %s]"),
23244 sect_offset_str (sect_off), sect_offset_str (src_die->sect_off),
23245 objfile_name (cu->per_cu->dwarf2_per_objfile->objfile));
23250 /* Return DWARF block referenced by DW_AT_location of DIE at SECT_OFF at PER_CU.
23251 Returned value is intended for DW_OP_call*. Returned
23252 dwarf2_locexpr_baton->data has lifetime of
23253 PER_CU->DWARF2_PER_OBJFILE->OBJFILE. */
23255 struct dwarf2_locexpr_baton
23256 dwarf2_fetch_die_loc_sect_off (sect_offset sect_off,
23257 struct dwarf2_per_cu_data *per_cu,
23258 CORE_ADDR (*get_frame_pc) (void *baton),
23259 void *baton, bool resolve_abstract_p)
23261 struct dwarf2_cu *cu;
23262 struct die_info *die;
23263 struct attribute *attr;
23264 struct dwarf2_locexpr_baton retval;
23265 struct dwarf2_per_objfile *dwarf2_per_objfile = per_cu->dwarf2_per_objfile;
23266 struct objfile *objfile = dwarf2_per_objfile->objfile;
23268 if (per_cu->cu == NULL)
23269 load_cu (per_cu, false);
23273 /* We shouldn't get here for a dummy CU, but don't crash on the user.
23274 Instead just throw an error, not much else we can do. */
23275 error (_("Dwarf Error: Dummy CU at %s referenced in module %s"),
23276 sect_offset_str (sect_off), objfile_name (objfile));
23279 die = follow_die_offset (sect_off, per_cu->is_dwz, &cu);
23281 error (_("Dwarf Error: Cannot find DIE at %s referenced in module %s"),
23282 sect_offset_str (sect_off), objfile_name (objfile));
23284 attr = dwarf2_attr (die, DW_AT_location, cu);
23285 if (!attr && resolve_abstract_p
23286 && (dwarf2_per_objfile->abstract_to_concrete.find (die)
23287 != dwarf2_per_objfile->abstract_to_concrete.end ()))
23289 CORE_ADDR pc = (*get_frame_pc) (baton);
23291 for (const auto &cand : dwarf2_per_objfile->abstract_to_concrete[die])
23294 || cand->parent->tag != DW_TAG_subprogram)
23297 CORE_ADDR pc_low, pc_high;
23298 get_scope_pc_bounds (cand->parent, &pc_low, &pc_high, cu);
23299 if (pc_low == ((CORE_ADDR) -1)
23300 || !(pc_low <= pc && pc < pc_high))
23304 attr = dwarf2_attr (die, DW_AT_location, cu);
23311 /* DWARF: "If there is no such attribute, then there is no effect.".
23312 DATA is ignored if SIZE is 0. */
23314 retval.data = NULL;
23317 else if (attr_form_is_section_offset (attr))
23319 struct dwarf2_loclist_baton loclist_baton;
23320 CORE_ADDR pc = (*get_frame_pc) (baton);
23323 fill_in_loclist_baton (cu, &loclist_baton, attr);
23325 retval.data = dwarf2_find_location_expression (&loclist_baton,
23327 retval.size = size;
23331 if (!attr_form_is_block (attr))
23332 error (_("Dwarf Error: DIE at %s referenced in module %s "
23333 "is neither DW_FORM_block* nor DW_FORM_exprloc"),
23334 sect_offset_str (sect_off), objfile_name (objfile));
23336 retval.data = DW_BLOCK (attr)->data;
23337 retval.size = DW_BLOCK (attr)->size;
23339 retval.per_cu = cu->per_cu;
23341 age_cached_comp_units (dwarf2_per_objfile);
23346 /* Like dwarf2_fetch_die_loc_sect_off, but take a CU
23349 struct dwarf2_locexpr_baton
23350 dwarf2_fetch_die_loc_cu_off (cu_offset offset_in_cu,
23351 struct dwarf2_per_cu_data *per_cu,
23352 CORE_ADDR (*get_frame_pc) (void *baton),
23355 sect_offset sect_off = per_cu->sect_off + to_underlying (offset_in_cu);
23357 return dwarf2_fetch_die_loc_sect_off (sect_off, per_cu, get_frame_pc, baton);
23360 /* Write a constant of a given type as target-ordered bytes into
23363 static const gdb_byte *
23364 write_constant_as_bytes (struct obstack *obstack,
23365 enum bfd_endian byte_order,
23372 *len = TYPE_LENGTH (type);
23373 result = (gdb_byte *) obstack_alloc (obstack, *len);
23374 store_unsigned_integer (result, *len, byte_order, value);
23379 /* If the DIE at OFFSET in PER_CU has a DW_AT_const_value, return a
23380 pointer to the constant bytes and set LEN to the length of the
23381 data. If memory is needed, allocate it on OBSTACK. If the DIE
23382 does not have a DW_AT_const_value, return NULL. */
23385 dwarf2_fetch_constant_bytes (sect_offset sect_off,
23386 struct dwarf2_per_cu_data *per_cu,
23387 struct obstack *obstack,
23390 struct dwarf2_cu *cu;
23391 struct die_info *die;
23392 struct attribute *attr;
23393 const gdb_byte *result = NULL;
23396 enum bfd_endian byte_order;
23397 struct objfile *objfile = per_cu->dwarf2_per_objfile->objfile;
23399 if (per_cu->cu == NULL)
23400 load_cu (per_cu, false);
23404 /* We shouldn't get here for a dummy CU, but don't crash on the user.
23405 Instead just throw an error, not much else we can do. */
23406 error (_("Dwarf Error: Dummy CU at %s referenced in module %s"),
23407 sect_offset_str (sect_off), objfile_name (objfile));
23410 die = follow_die_offset (sect_off, per_cu->is_dwz, &cu);
23412 error (_("Dwarf Error: Cannot find DIE at %s referenced in module %s"),
23413 sect_offset_str (sect_off), objfile_name (objfile));
23415 attr = dwarf2_attr (die, DW_AT_const_value, cu);
23419 byte_order = (bfd_big_endian (objfile->obfd)
23420 ? BFD_ENDIAN_BIG : BFD_ENDIAN_LITTLE);
23422 switch (attr->form)
23425 case DW_FORM_addrx:
23426 case DW_FORM_GNU_addr_index:
23430 *len = cu->header.addr_size;
23431 tem = (gdb_byte *) obstack_alloc (obstack, *len);
23432 store_unsigned_integer (tem, *len, byte_order, DW_ADDR (attr));
23436 case DW_FORM_string:
23439 case DW_FORM_GNU_str_index:
23440 case DW_FORM_GNU_strp_alt:
23441 /* DW_STRING is already allocated on the objfile obstack, point
23443 result = (const gdb_byte *) DW_STRING (attr);
23444 *len = strlen (DW_STRING (attr));
23446 case DW_FORM_block1:
23447 case DW_FORM_block2:
23448 case DW_FORM_block4:
23449 case DW_FORM_block:
23450 case DW_FORM_exprloc:
23451 case DW_FORM_data16:
23452 result = DW_BLOCK (attr)->data;
23453 *len = DW_BLOCK (attr)->size;
23456 /* The DW_AT_const_value attributes are supposed to carry the
23457 symbol's value "represented as it would be on the target
23458 architecture." By the time we get here, it's already been
23459 converted to host endianness, so we just need to sign- or
23460 zero-extend it as appropriate. */
23461 case DW_FORM_data1:
23462 type = die_type (die, cu);
23463 result = dwarf2_const_value_data (attr, obstack, cu, &value, 8);
23464 if (result == NULL)
23465 result = write_constant_as_bytes (obstack, byte_order,
23468 case DW_FORM_data2:
23469 type = die_type (die, cu);
23470 result = dwarf2_const_value_data (attr, obstack, cu, &value, 16);
23471 if (result == NULL)
23472 result = write_constant_as_bytes (obstack, byte_order,
23475 case DW_FORM_data4:
23476 type = die_type (die, cu);
23477 result = dwarf2_const_value_data (attr, obstack, cu, &value, 32);
23478 if (result == NULL)
23479 result = write_constant_as_bytes (obstack, byte_order,
23482 case DW_FORM_data8:
23483 type = die_type (die, cu);
23484 result = dwarf2_const_value_data (attr, obstack, cu, &value, 64);
23485 if (result == NULL)
23486 result = write_constant_as_bytes (obstack, byte_order,
23490 case DW_FORM_sdata:
23491 case DW_FORM_implicit_const:
23492 type = die_type (die, cu);
23493 result = write_constant_as_bytes (obstack, byte_order,
23494 type, DW_SND (attr), len);
23497 case DW_FORM_udata:
23498 type = die_type (die, cu);
23499 result = write_constant_as_bytes (obstack, byte_order,
23500 type, DW_UNSND (attr), len);
23504 complaint (_("unsupported const value attribute form: '%s'"),
23505 dwarf_form_name (attr->form));
23512 /* Return the type of the die at OFFSET in PER_CU. Return NULL if no
23513 valid type for this die is found. */
23516 dwarf2_fetch_die_type_sect_off (sect_offset sect_off,
23517 struct dwarf2_per_cu_data *per_cu)
23519 struct dwarf2_cu *cu;
23520 struct die_info *die;
23522 if (per_cu->cu == NULL)
23523 load_cu (per_cu, false);
23528 die = follow_die_offset (sect_off, per_cu->is_dwz, &cu);
23532 return die_type (die, cu);
23535 /* Return the type of the DIE at DIE_OFFSET in the CU named by
23539 dwarf2_get_die_type (cu_offset die_offset,
23540 struct dwarf2_per_cu_data *per_cu)
23542 sect_offset die_offset_sect = per_cu->sect_off + to_underlying (die_offset);
23543 return get_die_type_at_offset (die_offset_sect, per_cu);
23546 /* Follow type unit SIG_TYPE referenced by SRC_DIE.
23547 On entry *REF_CU is the CU of SRC_DIE.
23548 On exit *REF_CU is the CU of the result.
23549 Returns NULL if the referenced DIE isn't found. */
23551 static struct die_info *
23552 follow_die_sig_1 (struct die_info *src_die, struct signatured_type *sig_type,
23553 struct dwarf2_cu **ref_cu)
23555 struct die_info temp_die;
23556 struct dwarf2_cu *sig_cu, *cu = *ref_cu;
23557 struct die_info *die;
23559 /* While it might be nice to assert sig_type->type == NULL here,
23560 we can get here for DW_AT_imported_declaration where we need
23561 the DIE not the type. */
23563 /* If necessary, add it to the queue and load its DIEs. */
23565 if (maybe_queue_comp_unit (*ref_cu, &sig_type->per_cu, language_minimal))
23566 read_signatured_type (sig_type);
23568 sig_cu = sig_type->per_cu.cu;
23569 gdb_assert (sig_cu != NULL);
23570 gdb_assert (to_underlying (sig_type->type_offset_in_section) != 0);
23571 temp_die.sect_off = sig_type->type_offset_in_section;
23572 die = (struct die_info *) htab_find_with_hash (sig_cu->die_hash, &temp_die,
23573 to_underlying (temp_die.sect_off));
23576 struct dwarf2_per_objfile *dwarf2_per_objfile
23577 = (*ref_cu)->per_cu->dwarf2_per_objfile;
23579 /* For .gdb_index version 7 keep track of included TUs.
23580 http://sourceware.org/bugzilla/show_bug.cgi?id=15021. */
23581 if (dwarf2_per_objfile->index_table != NULL
23582 && dwarf2_per_objfile->index_table->version <= 7)
23584 VEC_safe_push (dwarf2_per_cu_ptr,
23585 (*ref_cu)->per_cu->imported_symtabs,
23591 sig_cu->ancestor = cu;
23599 /* Follow signatured type referenced by ATTR in SRC_DIE.
23600 On entry *REF_CU is the CU of SRC_DIE.
23601 On exit *REF_CU is the CU of the result.
23602 The result is the DIE of the type.
23603 If the referenced type cannot be found an error is thrown. */
23605 static struct die_info *
23606 follow_die_sig (struct die_info *src_die, const struct attribute *attr,
23607 struct dwarf2_cu **ref_cu)
23609 ULONGEST signature = DW_SIGNATURE (attr);
23610 struct signatured_type *sig_type;
23611 struct die_info *die;
23613 gdb_assert (attr->form == DW_FORM_ref_sig8);
23615 sig_type = lookup_signatured_type (*ref_cu, signature);
23616 /* sig_type will be NULL if the signatured type is missing from
23618 if (sig_type == NULL)
23620 error (_("Dwarf Error: Cannot find signatured DIE %s referenced"
23621 " from DIE at %s [in module %s]"),
23622 hex_string (signature), sect_offset_str (src_die->sect_off),
23623 objfile_name ((*ref_cu)->per_cu->dwarf2_per_objfile->objfile));
23626 die = follow_die_sig_1 (src_die, sig_type, ref_cu);
23629 dump_die_for_error (src_die);
23630 error (_("Dwarf Error: Problem reading signatured DIE %s referenced"
23631 " from DIE at %s [in module %s]"),
23632 hex_string (signature), sect_offset_str (src_die->sect_off),
23633 objfile_name ((*ref_cu)->per_cu->dwarf2_per_objfile->objfile));
23639 /* Get the type specified by SIGNATURE referenced in DIE/CU,
23640 reading in and processing the type unit if necessary. */
23642 static struct type *
23643 get_signatured_type (struct die_info *die, ULONGEST signature,
23644 struct dwarf2_cu *cu)
23646 struct dwarf2_per_objfile *dwarf2_per_objfile
23647 = cu->per_cu->dwarf2_per_objfile;
23648 struct signatured_type *sig_type;
23649 struct dwarf2_cu *type_cu;
23650 struct die_info *type_die;
23653 sig_type = lookup_signatured_type (cu, signature);
23654 /* sig_type will be NULL if the signatured type is missing from
23656 if (sig_type == NULL)
23658 complaint (_("Dwarf Error: Cannot find signatured DIE %s referenced"
23659 " from DIE at %s [in module %s]"),
23660 hex_string (signature), sect_offset_str (die->sect_off),
23661 objfile_name (dwarf2_per_objfile->objfile));
23662 return build_error_marker_type (cu, die);
23665 /* If we already know the type we're done. */
23666 if (sig_type->type != NULL)
23667 return sig_type->type;
23670 type_die = follow_die_sig_1 (die, sig_type, &type_cu);
23671 if (type_die != NULL)
23673 /* N.B. We need to call get_die_type to ensure only one type for this DIE
23674 is created. This is important, for example, because for c++ classes
23675 we need TYPE_NAME set which is only done by new_symbol. Blech. */
23676 type = read_type_die (type_die, type_cu);
23679 complaint (_("Dwarf Error: Cannot build signatured type %s"
23680 " referenced from DIE at %s [in module %s]"),
23681 hex_string (signature), sect_offset_str (die->sect_off),
23682 objfile_name (dwarf2_per_objfile->objfile));
23683 type = build_error_marker_type (cu, die);
23688 complaint (_("Dwarf Error: Problem reading signatured DIE %s referenced"
23689 " from DIE at %s [in module %s]"),
23690 hex_string (signature), sect_offset_str (die->sect_off),
23691 objfile_name (dwarf2_per_objfile->objfile));
23692 type = build_error_marker_type (cu, die);
23694 sig_type->type = type;
23699 /* Get the type specified by the DW_AT_signature ATTR in DIE/CU,
23700 reading in and processing the type unit if necessary. */
23702 static struct type *
23703 get_DW_AT_signature_type (struct die_info *die, const struct attribute *attr,
23704 struct dwarf2_cu *cu) /* ARI: editCase function */
23706 /* Yes, DW_AT_signature can use a non-ref_sig8 reference. */
23707 if (attr_form_is_ref (attr))
23709 struct dwarf2_cu *type_cu = cu;
23710 struct die_info *type_die = follow_die_ref (die, attr, &type_cu);
23712 return read_type_die (type_die, type_cu);
23714 else if (attr->form == DW_FORM_ref_sig8)
23716 return get_signatured_type (die, DW_SIGNATURE (attr), cu);
23720 struct dwarf2_per_objfile *dwarf2_per_objfile
23721 = cu->per_cu->dwarf2_per_objfile;
23723 complaint (_("Dwarf Error: DW_AT_signature has bad form %s in DIE"
23724 " at %s [in module %s]"),
23725 dwarf_form_name (attr->form), sect_offset_str (die->sect_off),
23726 objfile_name (dwarf2_per_objfile->objfile));
23727 return build_error_marker_type (cu, die);
23731 /* Load the DIEs associated with type unit PER_CU into memory. */
23734 load_full_type_unit (struct dwarf2_per_cu_data *per_cu)
23736 struct signatured_type *sig_type;
23738 /* Caller is responsible for ensuring type_unit_groups don't get here. */
23739 gdb_assert (! IS_TYPE_UNIT_GROUP (per_cu));
23741 /* We have the per_cu, but we need the signatured_type.
23742 Fortunately this is an easy translation. */
23743 gdb_assert (per_cu->is_debug_types);
23744 sig_type = (struct signatured_type *) per_cu;
23746 gdb_assert (per_cu->cu == NULL);
23748 read_signatured_type (sig_type);
23750 gdb_assert (per_cu->cu != NULL);
23753 /* die_reader_func for read_signatured_type.
23754 This is identical to load_full_comp_unit_reader,
23755 but is kept separate for now. */
23758 read_signatured_type_reader (const struct die_reader_specs *reader,
23759 const gdb_byte *info_ptr,
23760 struct die_info *comp_unit_die,
23764 struct dwarf2_cu *cu = reader->cu;
23766 gdb_assert (cu->die_hash == NULL);
23768 htab_create_alloc_ex (cu->header.length / 12,
23772 &cu->comp_unit_obstack,
23773 hashtab_obstack_allocate,
23774 dummy_obstack_deallocate);
23777 comp_unit_die->child = read_die_and_siblings (reader, info_ptr,
23778 &info_ptr, comp_unit_die);
23779 cu->dies = comp_unit_die;
23780 /* comp_unit_die is not stored in die_hash, no need. */
23782 /* We try not to read any attributes in this function, because not
23783 all CUs needed for references have been loaded yet, and symbol
23784 table processing isn't initialized. But we have to set the CU language,
23785 or we won't be able to build types correctly.
23786 Similarly, if we do not read the producer, we can not apply
23787 producer-specific interpretation. */
23788 prepare_one_comp_unit (cu, cu->dies, language_minimal);
23791 /* Read in a signatured type and build its CU and DIEs.
23792 If the type is a stub for the real type in a DWO file,
23793 read in the real type from the DWO file as well. */
23796 read_signatured_type (struct signatured_type *sig_type)
23798 struct dwarf2_per_cu_data *per_cu = &sig_type->per_cu;
23800 gdb_assert (per_cu->is_debug_types);
23801 gdb_assert (per_cu->cu == NULL);
23803 init_cutu_and_read_dies (per_cu, NULL, 0, 1, false,
23804 read_signatured_type_reader, NULL);
23805 sig_type->per_cu.tu_read = 1;
23808 /* Decode simple location descriptions.
23809 Given a pointer to a dwarf block that defines a location, compute
23810 the location and return the value.
23812 NOTE drow/2003-11-18: This function is called in two situations
23813 now: for the address of static or global variables (partial symbols
23814 only) and for offsets into structures which are expected to be
23815 (more or less) constant. The partial symbol case should go away,
23816 and only the constant case should remain. That will let this
23817 function complain more accurately. A few special modes are allowed
23818 without complaint for global variables (for instance, global
23819 register values and thread-local values).
23821 A location description containing no operations indicates that the
23822 object is optimized out. The return value is 0 for that case.
23823 FIXME drow/2003-11-16: No callers check for this case any more; soon all
23824 callers will only want a very basic result and this can become a
23827 Note that stack[0] is unused except as a default error return. */
23830 decode_locdesc (struct dwarf_block *blk, struct dwarf2_cu *cu)
23832 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
23834 size_t size = blk->size;
23835 const gdb_byte *data = blk->data;
23836 CORE_ADDR stack[64];
23838 unsigned int bytes_read, unsnd;
23844 stack[++stacki] = 0;
23883 stack[++stacki] = op - DW_OP_lit0;
23918 stack[++stacki] = op - DW_OP_reg0;
23920 dwarf2_complex_location_expr_complaint ();
23924 unsnd = read_unsigned_leb128 (NULL, (data + i), &bytes_read);
23926 stack[++stacki] = unsnd;
23928 dwarf2_complex_location_expr_complaint ();
23932 stack[++stacki] = read_address (objfile->obfd, &data[i],
23937 case DW_OP_const1u:
23938 stack[++stacki] = read_1_byte (objfile->obfd, &data[i]);
23942 case DW_OP_const1s:
23943 stack[++stacki] = read_1_signed_byte (objfile->obfd, &data[i]);
23947 case DW_OP_const2u:
23948 stack[++stacki] = read_2_bytes (objfile->obfd, &data[i]);
23952 case DW_OP_const2s:
23953 stack[++stacki] = read_2_signed_bytes (objfile->obfd, &data[i]);
23957 case DW_OP_const4u:
23958 stack[++stacki] = read_4_bytes (objfile->obfd, &data[i]);
23962 case DW_OP_const4s:
23963 stack[++stacki] = read_4_signed_bytes (objfile->obfd, &data[i]);
23967 case DW_OP_const8u:
23968 stack[++stacki] = read_8_bytes (objfile->obfd, &data[i]);
23973 stack[++stacki] = read_unsigned_leb128 (NULL, (data + i),
23979 stack[++stacki] = read_signed_leb128 (NULL, (data + i), &bytes_read);
23984 stack[stacki + 1] = stack[stacki];
23989 stack[stacki - 1] += stack[stacki];
23993 case DW_OP_plus_uconst:
23994 stack[stacki] += read_unsigned_leb128 (NULL, (data + i),
24000 stack[stacki - 1] -= stack[stacki];
24005 /* If we're not the last op, then we definitely can't encode
24006 this using GDB's address_class enum. This is valid for partial
24007 global symbols, although the variable's address will be bogus
24010 dwarf2_complex_location_expr_complaint ();
24013 case DW_OP_GNU_push_tls_address:
24014 case DW_OP_form_tls_address:
24015 /* The top of the stack has the offset from the beginning
24016 of the thread control block at which the variable is located. */
24017 /* Nothing should follow this operator, so the top of stack would
24019 /* This is valid for partial global symbols, but the variable's
24020 address will be bogus in the psymtab. Make it always at least
24021 non-zero to not look as a variable garbage collected by linker
24022 which have DW_OP_addr 0. */
24024 dwarf2_complex_location_expr_complaint ();
24028 case DW_OP_GNU_uninit:
24032 case DW_OP_GNU_addr_index:
24033 case DW_OP_GNU_const_index:
24034 stack[++stacki] = read_addr_index_from_leb128 (cu, &data[i],
24041 const char *name = get_DW_OP_name (op);
24044 complaint (_("unsupported stack op: '%s'"),
24047 complaint (_("unsupported stack op: '%02x'"),
24051 return (stack[stacki]);
24054 /* Enforce maximum stack depth of SIZE-1 to avoid writing
24055 outside of the allocated space. Also enforce minimum>0. */
24056 if (stacki >= ARRAY_SIZE (stack) - 1)
24058 complaint (_("location description stack overflow"));
24064 complaint (_("location description stack underflow"));
24068 return (stack[stacki]);
24071 /* memory allocation interface */
24073 static struct dwarf_block *
24074 dwarf_alloc_block (struct dwarf2_cu *cu)
24076 return XOBNEW (&cu->comp_unit_obstack, struct dwarf_block);
24079 static struct die_info *
24080 dwarf_alloc_die (struct dwarf2_cu *cu, int num_attrs)
24082 struct die_info *die;
24083 size_t size = sizeof (struct die_info);
24086 size += (num_attrs - 1) * sizeof (struct attribute);
24088 die = (struct die_info *) obstack_alloc (&cu->comp_unit_obstack, size);
24089 memset (die, 0, sizeof (struct die_info));
24094 /* Macro support. */
24096 /* Return file name relative to the compilation directory of file number I in
24097 *LH's file name table. The result is allocated using xmalloc; the caller is
24098 responsible for freeing it. */
24101 file_file_name (int file, struct line_header *lh)
24103 /* Is the file number a valid index into the line header's file name
24104 table? Remember that file numbers start with one, not zero. */
24105 if (1 <= file && file <= lh->file_names.size ())
24107 const file_entry &fe = lh->file_names[file - 1];
24109 if (!IS_ABSOLUTE_PATH (fe.name))
24111 const char *dir = fe.include_dir (lh);
24113 return concat (dir, SLASH_STRING, fe.name, (char *) NULL);
24115 return xstrdup (fe.name);
24119 /* The compiler produced a bogus file number. We can at least
24120 record the macro definitions made in the file, even if we
24121 won't be able to find the file by name. */
24122 char fake_name[80];
24124 xsnprintf (fake_name, sizeof (fake_name),
24125 "<bad macro file number %d>", file);
24127 complaint (_("bad file number in macro information (%d)"),
24130 return xstrdup (fake_name);
24134 /* Return the full name of file number I in *LH's file name table.
24135 Use COMP_DIR as the name of the current directory of the
24136 compilation. The result is allocated using xmalloc; the caller is
24137 responsible for freeing it. */
24139 file_full_name (int file, struct line_header *lh, const char *comp_dir)
24141 /* Is the file number a valid index into the line header's file name
24142 table? Remember that file numbers start with one, not zero. */
24143 if (1 <= file && file <= lh->file_names.size ())
24145 char *relative = file_file_name (file, lh);
24147 if (IS_ABSOLUTE_PATH (relative) || comp_dir == NULL)
24149 return reconcat (relative, comp_dir, SLASH_STRING,
24150 relative, (char *) NULL);
24153 return file_file_name (file, lh);
24157 static struct macro_source_file *
24158 macro_start_file (struct dwarf2_cu *cu,
24159 int file, int line,
24160 struct macro_source_file *current_file,
24161 struct line_header *lh)
24163 /* File name relative to the compilation directory of this source file. */
24164 char *file_name = file_file_name (file, lh);
24166 if (! current_file)
24168 /* Note: We don't create a macro table for this compilation unit
24169 at all until we actually get a filename. */
24170 struct macro_table *macro_table = cu->get_builder ()->get_macro_table ();
24172 /* If we have no current file, then this must be the start_file
24173 directive for the compilation unit's main source file. */
24174 current_file = macro_set_main (macro_table, file_name);
24175 macro_define_special (macro_table);
24178 current_file = macro_include (current_file, line, file_name);
24182 return current_file;
24185 static const char *
24186 consume_improper_spaces (const char *p, const char *body)
24190 complaint (_("macro definition contains spaces "
24191 "in formal argument list:\n`%s'"),
24203 parse_macro_definition (struct macro_source_file *file, int line,
24208 /* The body string takes one of two forms. For object-like macro
24209 definitions, it should be:
24211 <macro name> " " <definition>
24213 For function-like macro definitions, it should be:
24215 <macro name> "() " <definition>
24217 <macro name> "(" <arg name> ( "," <arg name> ) * ") " <definition>
24219 Spaces may appear only where explicitly indicated, and in the
24222 The Dwarf 2 spec says that an object-like macro's name is always
24223 followed by a space, but versions of GCC around March 2002 omit
24224 the space when the macro's definition is the empty string.
24226 The Dwarf 2 spec says that there should be no spaces between the
24227 formal arguments in a function-like macro's formal argument list,
24228 but versions of GCC around March 2002 include spaces after the
24232 /* Find the extent of the macro name. The macro name is terminated
24233 by either a space or null character (for an object-like macro) or
24234 an opening paren (for a function-like macro). */
24235 for (p = body; *p; p++)
24236 if (*p == ' ' || *p == '(')
24239 if (*p == ' ' || *p == '\0')
24241 /* It's an object-like macro. */
24242 int name_len = p - body;
24243 char *name = savestring (body, name_len);
24244 const char *replacement;
24247 replacement = body + name_len + 1;
24250 dwarf2_macro_malformed_definition_complaint (body);
24251 replacement = body + name_len;
24254 macro_define_object (file, line, name, replacement);
24258 else if (*p == '(')
24260 /* It's a function-like macro. */
24261 char *name = savestring (body, p - body);
24264 char **argv = XNEWVEC (char *, argv_size);
24268 p = consume_improper_spaces (p, body);
24270 /* Parse the formal argument list. */
24271 while (*p && *p != ')')
24273 /* Find the extent of the current argument name. */
24274 const char *arg_start = p;
24276 while (*p && *p != ',' && *p != ')' && *p != ' ')
24279 if (! *p || p == arg_start)
24280 dwarf2_macro_malformed_definition_complaint (body);
24283 /* Make sure argv has room for the new argument. */
24284 if (argc >= argv_size)
24287 argv = XRESIZEVEC (char *, argv, argv_size);
24290 argv[argc++] = savestring (arg_start, p - arg_start);
24293 p = consume_improper_spaces (p, body);
24295 /* Consume the comma, if present. */
24300 p = consume_improper_spaces (p, body);
24309 /* Perfectly formed definition, no complaints. */
24310 macro_define_function (file, line, name,
24311 argc, (const char **) argv,
24313 else if (*p == '\0')
24315 /* Complain, but do define it. */
24316 dwarf2_macro_malformed_definition_complaint (body);
24317 macro_define_function (file, line, name,
24318 argc, (const char **) argv,
24322 /* Just complain. */
24323 dwarf2_macro_malformed_definition_complaint (body);
24326 /* Just complain. */
24327 dwarf2_macro_malformed_definition_complaint (body);
24333 for (i = 0; i < argc; i++)
24339 dwarf2_macro_malformed_definition_complaint (body);
24342 /* Skip some bytes from BYTES according to the form given in FORM.
24343 Returns the new pointer. */
24345 static const gdb_byte *
24346 skip_form_bytes (bfd *abfd, const gdb_byte *bytes, const gdb_byte *buffer_end,
24347 enum dwarf_form form,
24348 unsigned int offset_size,
24349 struct dwarf2_section_info *section)
24351 unsigned int bytes_read;
24355 case DW_FORM_data1:
24360 case DW_FORM_data2:
24364 case DW_FORM_data4:
24368 case DW_FORM_data8:
24372 case DW_FORM_data16:
24376 case DW_FORM_string:
24377 read_direct_string (abfd, bytes, &bytes_read);
24378 bytes += bytes_read;
24381 case DW_FORM_sec_offset:
24383 case DW_FORM_GNU_strp_alt:
24384 bytes += offset_size;
24387 case DW_FORM_block:
24388 bytes += read_unsigned_leb128 (abfd, bytes, &bytes_read);
24389 bytes += bytes_read;
24392 case DW_FORM_block1:
24393 bytes += 1 + read_1_byte (abfd, bytes);
24395 case DW_FORM_block2:
24396 bytes += 2 + read_2_bytes (abfd, bytes);
24398 case DW_FORM_block4:
24399 bytes += 4 + read_4_bytes (abfd, bytes);
24402 case DW_FORM_addrx:
24403 case DW_FORM_sdata:
24405 case DW_FORM_udata:
24406 case DW_FORM_GNU_addr_index:
24407 case DW_FORM_GNU_str_index:
24408 bytes = gdb_skip_leb128 (bytes, buffer_end);
24411 dwarf2_section_buffer_overflow_complaint (section);
24416 case DW_FORM_implicit_const:
24421 complaint (_("invalid form 0x%x in `%s'"),
24422 form, get_section_name (section));
24430 /* A helper for dwarf_decode_macros that handles skipping an unknown
24431 opcode. Returns an updated pointer to the macro data buffer; or,
24432 on error, issues a complaint and returns NULL. */
24434 static const gdb_byte *
24435 skip_unknown_opcode (unsigned int opcode,
24436 const gdb_byte **opcode_definitions,
24437 const gdb_byte *mac_ptr, const gdb_byte *mac_end,
24439 unsigned int offset_size,
24440 struct dwarf2_section_info *section)
24442 unsigned int bytes_read, i;
24444 const gdb_byte *defn;
24446 if (opcode_definitions[opcode] == NULL)
24448 complaint (_("unrecognized DW_MACFINO opcode 0x%x"),
24453 defn = opcode_definitions[opcode];
24454 arg = read_unsigned_leb128 (abfd, defn, &bytes_read);
24455 defn += bytes_read;
24457 for (i = 0; i < arg; ++i)
24459 mac_ptr = skip_form_bytes (abfd, mac_ptr, mac_end,
24460 (enum dwarf_form) defn[i], offset_size,
24462 if (mac_ptr == NULL)
24464 /* skip_form_bytes already issued the complaint. */
24472 /* A helper function which parses the header of a macro section.
24473 If the macro section is the extended (for now called "GNU") type,
24474 then this updates *OFFSET_SIZE. Returns a pointer to just after
24475 the header, or issues a complaint and returns NULL on error. */
24477 static const gdb_byte *
24478 dwarf_parse_macro_header (const gdb_byte **opcode_definitions,
24480 const gdb_byte *mac_ptr,
24481 unsigned int *offset_size,
24482 int section_is_gnu)
24484 memset (opcode_definitions, 0, 256 * sizeof (gdb_byte *));
24486 if (section_is_gnu)
24488 unsigned int version, flags;
24490 version = read_2_bytes (abfd, mac_ptr);
24491 if (version != 4 && version != 5)
24493 complaint (_("unrecognized version `%d' in .debug_macro section"),
24499 flags = read_1_byte (abfd, mac_ptr);
24501 *offset_size = (flags & 1) ? 8 : 4;
24503 if ((flags & 2) != 0)
24504 /* We don't need the line table offset. */
24505 mac_ptr += *offset_size;
24507 /* Vendor opcode descriptions. */
24508 if ((flags & 4) != 0)
24510 unsigned int i, count;
24512 count = read_1_byte (abfd, mac_ptr);
24514 for (i = 0; i < count; ++i)
24516 unsigned int opcode, bytes_read;
24519 opcode = read_1_byte (abfd, mac_ptr);
24521 opcode_definitions[opcode] = mac_ptr;
24522 arg = read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
24523 mac_ptr += bytes_read;
24532 /* A helper for dwarf_decode_macros that handles the GNU extensions,
24533 including DW_MACRO_import. */
24536 dwarf_decode_macro_bytes (struct dwarf2_cu *cu,
24538 const gdb_byte *mac_ptr, const gdb_byte *mac_end,
24539 struct macro_source_file *current_file,
24540 struct line_header *lh,
24541 struct dwarf2_section_info *section,
24542 int section_is_gnu, int section_is_dwz,
24543 unsigned int offset_size,
24544 htab_t include_hash)
24546 struct dwarf2_per_objfile *dwarf2_per_objfile
24547 = cu->per_cu->dwarf2_per_objfile;
24548 struct objfile *objfile = dwarf2_per_objfile->objfile;
24549 enum dwarf_macro_record_type macinfo_type;
24550 int at_commandline;
24551 const gdb_byte *opcode_definitions[256];
24553 mac_ptr = dwarf_parse_macro_header (opcode_definitions, abfd, mac_ptr,
24554 &offset_size, section_is_gnu);
24555 if (mac_ptr == NULL)
24557 /* We already issued a complaint. */
24561 /* Determines if GDB is still before first DW_MACINFO_start_file. If true
24562 GDB is still reading the definitions from command line. First
24563 DW_MACINFO_start_file will need to be ignored as it was already executed
24564 to create CURRENT_FILE for the main source holding also the command line
24565 definitions. On first met DW_MACINFO_start_file this flag is reset to
24566 normally execute all the remaining DW_MACINFO_start_file macinfos. */
24568 at_commandline = 1;
24572 /* Do we at least have room for a macinfo type byte? */
24573 if (mac_ptr >= mac_end)
24575 dwarf2_section_buffer_overflow_complaint (section);
24579 macinfo_type = (enum dwarf_macro_record_type) read_1_byte (abfd, mac_ptr);
24582 /* Note that we rely on the fact that the corresponding GNU and
24583 DWARF constants are the same. */
24585 DIAGNOSTIC_IGNORE_SWITCH_DIFFERENT_ENUM_TYPES
24586 switch (macinfo_type)
24588 /* A zero macinfo type indicates the end of the macro
24593 case DW_MACRO_define:
24594 case DW_MACRO_undef:
24595 case DW_MACRO_define_strp:
24596 case DW_MACRO_undef_strp:
24597 case DW_MACRO_define_sup:
24598 case DW_MACRO_undef_sup:
24600 unsigned int bytes_read;
24605 line = read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
24606 mac_ptr += bytes_read;
24608 if (macinfo_type == DW_MACRO_define
24609 || macinfo_type == DW_MACRO_undef)
24611 body = read_direct_string (abfd, mac_ptr, &bytes_read);
24612 mac_ptr += bytes_read;
24616 LONGEST str_offset;
24618 str_offset = read_offset_1 (abfd, mac_ptr, offset_size);
24619 mac_ptr += offset_size;
24621 if (macinfo_type == DW_MACRO_define_sup
24622 || macinfo_type == DW_MACRO_undef_sup
24625 struct dwz_file *dwz
24626 = dwarf2_get_dwz_file (dwarf2_per_objfile);
24628 body = read_indirect_string_from_dwz (objfile,
24632 body = read_indirect_string_at_offset (dwarf2_per_objfile,
24636 is_define = (macinfo_type == DW_MACRO_define
24637 || macinfo_type == DW_MACRO_define_strp
24638 || macinfo_type == DW_MACRO_define_sup);
24639 if (! current_file)
24641 /* DWARF violation as no main source is present. */
24642 complaint (_("debug info with no main source gives macro %s "
24644 is_define ? _("definition") : _("undefinition"),
24648 if ((line == 0 && !at_commandline)
24649 || (line != 0 && at_commandline))
24650 complaint (_("debug info gives %s macro %s with %s line %d: %s"),
24651 at_commandline ? _("command-line") : _("in-file"),
24652 is_define ? _("definition") : _("undefinition"),
24653 line == 0 ? _("zero") : _("non-zero"), line, body);
24657 /* Fedora's rpm-build's "debugedit" binary
24658 corrupted .debug_macro sections.
24661 https://bugzilla.redhat.com/show_bug.cgi?id=1708786 */
24662 complaint (_("debug info gives %s invalid macro %s "
24663 "without body (corrupted?) at line %d "
24665 at_commandline ? _("command-line") : _("in-file"),
24666 is_define ? _("definition") : _("undefinition"),
24667 line, current_file->filename);
24669 else if (is_define)
24670 parse_macro_definition (current_file, line, body);
24673 gdb_assert (macinfo_type == DW_MACRO_undef
24674 || macinfo_type == DW_MACRO_undef_strp
24675 || macinfo_type == DW_MACRO_undef_sup);
24676 macro_undef (current_file, line, body);
24681 case DW_MACRO_start_file:
24683 unsigned int bytes_read;
24686 line = read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
24687 mac_ptr += bytes_read;
24688 file = read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
24689 mac_ptr += bytes_read;
24691 if ((line == 0 && !at_commandline)
24692 || (line != 0 && at_commandline))
24693 complaint (_("debug info gives source %d included "
24694 "from %s at %s line %d"),
24695 file, at_commandline ? _("command-line") : _("file"),
24696 line == 0 ? _("zero") : _("non-zero"), line);
24698 if (at_commandline)
24700 /* This DW_MACRO_start_file was executed in the
24702 at_commandline = 0;
24705 current_file = macro_start_file (cu, file, line, current_file,
24710 case DW_MACRO_end_file:
24711 if (! current_file)
24712 complaint (_("macro debug info has an unmatched "
24713 "`close_file' directive"));
24716 current_file = current_file->included_by;
24717 if (! current_file)
24719 enum dwarf_macro_record_type next_type;
24721 /* GCC circa March 2002 doesn't produce the zero
24722 type byte marking the end of the compilation
24723 unit. Complain if it's not there, but exit no
24726 /* Do we at least have room for a macinfo type byte? */
24727 if (mac_ptr >= mac_end)
24729 dwarf2_section_buffer_overflow_complaint (section);
24733 /* We don't increment mac_ptr here, so this is just
24736 = (enum dwarf_macro_record_type) read_1_byte (abfd,
24738 if (next_type != 0)
24739 complaint (_("no terminating 0-type entry for "
24740 "macros in `.debug_macinfo' section"));
24747 case DW_MACRO_import:
24748 case DW_MACRO_import_sup:
24752 bfd *include_bfd = abfd;
24753 struct dwarf2_section_info *include_section = section;
24754 const gdb_byte *include_mac_end = mac_end;
24755 int is_dwz = section_is_dwz;
24756 const gdb_byte *new_mac_ptr;
24758 offset = read_offset_1 (abfd, mac_ptr, offset_size);
24759 mac_ptr += offset_size;
24761 if (macinfo_type == DW_MACRO_import_sup)
24763 struct dwz_file *dwz = dwarf2_get_dwz_file (dwarf2_per_objfile);
24765 dwarf2_read_section (objfile, &dwz->macro);
24767 include_section = &dwz->macro;
24768 include_bfd = get_section_bfd_owner (include_section);
24769 include_mac_end = dwz->macro.buffer + dwz->macro.size;
24773 new_mac_ptr = include_section->buffer + offset;
24774 slot = htab_find_slot (include_hash, new_mac_ptr, INSERT);
24778 /* This has actually happened; see
24779 http://sourceware.org/bugzilla/show_bug.cgi?id=13568. */
24780 complaint (_("recursive DW_MACRO_import in "
24781 ".debug_macro section"));
24785 *slot = (void *) new_mac_ptr;
24787 dwarf_decode_macro_bytes (cu, include_bfd, new_mac_ptr,
24788 include_mac_end, current_file, lh,
24789 section, section_is_gnu, is_dwz,
24790 offset_size, include_hash);
24792 htab_remove_elt (include_hash, (void *) new_mac_ptr);
24797 case DW_MACINFO_vendor_ext:
24798 if (!section_is_gnu)
24800 unsigned int bytes_read;
24802 /* This reads the constant, but since we don't recognize
24803 any vendor extensions, we ignore it. */
24804 read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
24805 mac_ptr += bytes_read;
24806 read_direct_string (abfd, mac_ptr, &bytes_read);
24807 mac_ptr += bytes_read;
24809 /* We don't recognize any vendor extensions. */
24815 mac_ptr = skip_unknown_opcode (macinfo_type, opcode_definitions,
24816 mac_ptr, mac_end, abfd, offset_size,
24818 if (mac_ptr == NULL)
24823 } while (macinfo_type != 0);
24827 dwarf_decode_macros (struct dwarf2_cu *cu, unsigned int offset,
24828 int section_is_gnu)
24830 struct dwarf2_per_objfile *dwarf2_per_objfile
24831 = cu->per_cu->dwarf2_per_objfile;
24832 struct objfile *objfile = dwarf2_per_objfile->objfile;
24833 struct line_header *lh = cu->line_header;
24835 const gdb_byte *mac_ptr, *mac_end;
24836 struct macro_source_file *current_file = 0;
24837 enum dwarf_macro_record_type macinfo_type;
24838 unsigned int offset_size = cu->header.offset_size;
24839 const gdb_byte *opcode_definitions[256];
24841 struct dwarf2_section_info *section;
24842 const char *section_name;
24844 if (cu->dwo_unit != NULL)
24846 if (section_is_gnu)
24848 section = &cu->dwo_unit->dwo_file->sections.macro;
24849 section_name = ".debug_macro.dwo";
24853 section = &cu->dwo_unit->dwo_file->sections.macinfo;
24854 section_name = ".debug_macinfo.dwo";
24859 if (section_is_gnu)
24861 section = &dwarf2_per_objfile->macro;
24862 section_name = ".debug_macro";
24866 section = &dwarf2_per_objfile->macinfo;
24867 section_name = ".debug_macinfo";
24871 dwarf2_read_section (objfile, section);
24872 if (section->buffer == NULL)
24874 complaint (_("missing %s section"), section_name);
24877 abfd = get_section_bfd_owner (section);
24879 /* First pass: Find the name of the base filename.
24880 This filename is needed in order to process all macros whose definition
24881 (or undefinition) comes from the command line. These macros are defined
24882 before the first DW_MACINFO_start_file entry, and yet still need to be
24883 associated to the base file.
24885 To determine the base file name, we scan the macro definitions until we
24886 reach the first DW_MACINFO_start_file entry. We then initialize
24887 CURRENT_FILE accordingly so that any macro definition found before the
24888 first DW_MACINFO_start_file can still be associated to the base file. */
24890 mac_ptr = section->buffer + offset;
24891 mac_end = section->buffer + section->size;
24893 mac_ptr = dwarf_parse_macro_header (opcode_definitions, abfd, mac_ptr,
24894 &offset_size, section_is_gnu);
24895 if (mac_ptr == NULL)
24897 /* We already issued a complaint. */
24903 /* Do we at least have room for a macinfo type byte? */
24904 if (mac_ptr >= mac_end)
24906 /* Complaint is printed during the second pass as GDB will probably
24907 stop the first pass earlier upon finding
24908 DW_MACINFO_start_file. */
24912 macinfo_type = (enum dwarf_macro_record_type) read_1_byte (abfd, mac_ptr);
24915 /* Note that we rely on the fact that the corresponding GNU and
24916 DWARF constants are the same. */
24918 DIAGNOSTIC_IGNORE_SWITCH_DIFFERENT_ENUM_TYPES
24919 switch (macinfo_type)
24921 /* A zero macinfo type indicates the end of the macro
24926 case DW_MACRO_define:
24927 case DW_MACRO_undef:
24928 /* Only skip the data by MAC_PTR. */
24930 unsigned int bytes_read;
24932 read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
24933 mac_ptr += bytes_read;
24934 read_direct_string (abfd, mac_ptr, &bytes_read);
24935 mac_ptr += bytes_read;
24939 case DW_MACRO_start_file:
24941 unsigned int bytes_read;
24944 line = read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
24945 mac_ptr += bytes_read;
24946 file = read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
24947 mac_ptr += bytes_read;
24949 current_file = macro_start_file (cu, file, line, current_file, lh);
24953 case DW_MACRO_end_file:
24954 /* No data to skip by MAC_PTR. */
24957 case DW_MACRO_define_strp:
24958 case DW_MACRO_undef_strp:
24959 case DW_MACRO_define_sup:
24960 case DW_MACRO_undef_sup:
24962 unsigned int bytes_read;
24964 read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
24965 mac_ptr += bytes_read;
24966 mac_ptr += offset_size;
24970 case DW_MACRO_import:
24971 case DW_MACRO_import_sup:
24972 /* Note that, according to the spec, a transparent include
24973 chain cannot call DW_MACRO_start_file. So, we can just
24974 skip this opcode. */
24975 mac_ptr += offset_size;
24978 case DW_MACINFO_vendor_ext:
24979 /* Only skip the data by MAC_PTR. */
24980 if (!section_is_gnu)
24982 unsigned int bytes_read;
24984 read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
24985 mac_ptr += bytes_read;
24986 read_direct_string (abfd, mac_ptr, &bytes_read);
24987 mac_ptr += bytes_read;
24992 mac_ptr = skip_unknown_opcode (macinfo_type, opcode_definitions,
24993 mac_ptr, mac_end, abfd, offset_size,
24995 if (mac_ptr == NULL)
25000 } while (macinfo_type != 0 && current_file == NULL);
25002 /* Second pass: Process all entries.
25004 Use the AT_COMMAND_LINE flag to determine whether we are still processing
25005 command-line macro definitions/undefinitions. This flag is unset when we
25006 reach the first DW_MACINFO_start_file entry. */
25008 htab_up include_hash (htab_create_alloc (1, htab_hash_pointer,
25010 NULL, xcalloc, xfree));
25011 mac_ptr = section->buffer + offset;
25012 slot = htab_find_slot (include_hash.get (), mac_ptr, INSERT);
25013 *slot = (void *) mac_ptr;
25014 dwarf_decode_macro_bytes (cu, abfd, mac_ptr, mac_end,
25015 current_file, lh, section,
25016 section_is_gnu, 0, offset_size,
25017 include_hash.get ());
25020 /* Check if the attribute's form is a DW_FORM_block*
25021 if so return true else false. */
25024 attr_form_is_block (const struct attribute *attr)
25026 return (attr == NULL ? 0 :
25027 attr->form == DW_FORM_block1
25028 || attr->form == DW_FORM_block2
25029 || attr->form == DW_FORM_block4
25030 || attr->form == DW_FORM_block
25031 || attr->form == DW_FORM_exprloc);
25034 /* Return non-zero if ATTR's value is a section offset --- classes
25035 lineptr, loclistptr, macptr or rangelistptr --- or zero, otherwise.
25036 You may use DW_UNSND (attr) to retrieve such offsets.
25038 Section 7.5.4, "Attribute Encodings", explains that no attribute
25039 may have a value that belongs to more than one of these classes; it
25040 would be ambiguous if we did, because we use the same forms for all
25044 attr_form_is_section_offset (const struct attribute *attr)
25046 return (attr->form == DW_FORM_data4
25047 || attr->form == DW_FORM_data8
25048 || attr->form == DW_FORM_sec_offset);
25051 /* Return non-zero if ATTR's value falls in the 'constant' class, or
25052 zero otherwise. When this function returns true, you can apply
25053 dwarf2_get_attr_constant_value to it.
25055 However, note that for some attributes you must check
25056 attr_form_is_section_offset before using this test. DW_FORM_data4
25057 and DW_FORM_data8 are members of both the constant class, and of
25058 the classes that contain offsets into other debug sections
25059 (lineptr, loclistptr, macptr or rangelistptr). The DWARF spec says
25060 that, if an attribute's can be either a constant or one of the
25061 section offset classes, DW_FORM_data4 and DW_FORM_data8 should be
25062 taken as section offsets, not constants.
25064 DW_FORM_data16 is not considered as dwarf2_get_attr_constant_value
25065 cannot handle that. */
25068 attr_form_is_constant (const struct attribute *attr)
25070 switch (attr->form)
25072 case DW_FORM_sdata:
25073 case DW_FORM_udata:
25074 case DW_FORM_data1:
25075 case DW_FORM_data2:
25076 case DW_FORM_data4:
25077 case DW_FORM_data8:
25078 case DW_FORM_implicit_const:
25086 /* DW_ADDR is always stored already as sect_offset; despite for the forms
25087 besides DW_FORM_ref_addr it is stored as cu_offset in the DWARF file. */
25090 attr_form_is_ref (const struct attribute *attr)
25092 switch (attr->form)
25094 case DW_FORM_ref_addr:
25099 case DW_FORM_ref_udata:
25100 case DW_FORM_GNU_ref_alt:
25107 /* Return the .debug_loc section to use for CU.
25108 For DWO files use .debug_loc.dwo. */
25110 static struct dwarf2_section_info *
25111 cu_debug_loc_section (struct dwarf2_cu *cu)
25113 struct dwarf2_per_objfile *dwarf2_per_objfile
25114 = cu->per_cu->dwarf2_per_objfile;
25118 struct dwo_sections *sections = &cu->dwo_unit->dwo_file->sections;
25120 return cu->header.version >= 5 ? §ions->loclists : §ions->loc;
25122 return (cu->header.version >= 5 ? &dwarf2_per_objfile->loclists
25123 : &dwarf2_per_objfile->loc);
25126 /* A helper function that fills in a dwarf2_loclist_baton. */
25129 fill_in_loclist_baton (struct dwarf2_cu *cu,
25130 struct dwarf2_loclist_baton *baton,
25131 const struct attribute *attr)
25133 struct dwarf2_per_objfile *dwarf2_per_objfile
25134 = cu->per_cu->dwarf2_per_objfile;
25135 struct dwarf2_section_info *section = cu_debug_loc_section (cu);
25137 dwarf2_read_section (dwarf2_per_objfile->objfile, section);
25139 baton->per_cu = cu->per_cu;
25140 gdb_assert (baton->per_cu);
25141 /* We don't know how long the location list is, but make sure we
25142 don't run off the edge of the section. */
25143 baton->size = section->size - DW_UNSND (attr);
25144 baton->data = section->buffer + DW_UNSND (attr);
25145 baton->base_address = cu->base_address;
25146 baton->from_dwo = cu->dwo_unit != NULL;
25150 dwarf2_symbol_mark_computed (const struct attribute *attr, struct symbol *sym,
25151 struct dwarf2_cu *cu, int is_block)
25153 struct dwarf2_per_objfile *dwarf2_per_objfile
25154 = cu->per_cu->dwarf2_per_objfile;
25155 struct objfile *objfile = dwarf2_per_objfile->objfile;
25156 struct dwarf2_section_info *section = cu_debug_loc_section (cu);
25158 if (attr_form_is_section_offset (attr)
25159 /* .debug_loc{,.dwo} may not exist at all, or the offset may be outside
25160 the section. If so, fall through to the complaint in the
25162 && DW_UNSND (attr) < dwarf2_section_size (objfile, section))
25164 struct dwarf2_loclist_baton *baton;
25166 baton = XOBNEW (&objfile->objfile_obstack, struct dwarf2_loclist_baton);
25168 fill_in_loclist_baton (cu, baton, attr);
25170 if (cu->base_known == 0)
25171 complaint (_("Location list used without "
25172 "specifying the CU base address."));
25174 SYMBOL_ACLASS_INDEX (sym) = (is_block
25175 ? dwarf2_loclist_block_index
25176 : dwarf2_loclist_index);
25177 SYMBOL_LOCATION_BATON (sym) = baton;
25181 struct dwarf2_locexpr_baton *baton;
25183 baton = XOBNEW (&objfile->objfile_obstack, struct dwarf2_locexpr_baton);
25184 baton->per_cu = cu->per_cu;
25185 gdb_assert (baton->per_cu);
25187 if (attr_form_is_block (attr))
25189 /* Note that we're just copying the block's data pointer
25190 here, not the actual data. We're still pointing into the
25191 info_buffer for SYM's objfile; right now we never release
25192 that buffer, but when we do clean up properly this may
25194 baton->size = DW_BLOCK (attr)->size;
25195 baton->data = DW_BLOCK (attr)->data;
25199 dwarf2_invalid_attrib_class_complaint ("location description",
25200 SYMBOL_NATURAL_NAME (sym));
25204 SYMBOL_ACLASS_INDEX (sym) = (is_block
25205 ? dwarf2_locexpr_block_index
25206 : dwarf2_locexpr_index);
25207 SYMBOL_LOCATION_BATON (sym) = baton;
25211 /* Return the OBJFILE associated with the compilation unit CU. If CU
25212 came from a separate debuginfo file, then the master objfile is
25216 dwarf2_per_cu_objfile (struct dwarf2_per_cu_data *per_cu)
25218 struct objfile *objfile = per_cu->dwarf2_per_objfile->objfile;
25220 /* Return the master objfile, so that we can report and look up the
25221 correct file containing this variable. */
25222 if (objfile->separate_debug_objfile_backlink)
25223 objfile = objfile->separate_debug_objfile_backlink;
25228 /* Return comp_unit_head for PER_CU, either already available in PER_CU->CU
25229 (CU_HEADERP is unused in such case) or prepare a temporary copy at
25230 CU_HEADERP first. */
25232 static const struct comp_unit_head *
25233 per_cu_header_read_in (struct comp_unit_head *cu_headerp,
25234 struct dwarf2_per_cu_data *per_cu)
25236 const gdb_byte *info_ptr;
25239 return &per_cu->cu->header;
25241 info_ptr = per_cu->section->buffer + to_underlying (per_cu->sect_off);
25243 memset (cu_headerp, 0, sizeof (*cu_headerp));
25244 read_comp_unit_head (cu_headerp, info_ptr, per_cu->section,
25245 rcuh_kind::COMPILE);
25250 /* Return the address size given in the compilation unit header for CU. */
25253 dwarf2_per_cu_addr_size (struct dwarf2_per_cu_data *per_cu)
25255 struct comp_unit_head cu_header_local;
25256 const struct comp_unit_head *cu_headerp;
25258 cu_headerp = per_cu_header_read_in (&cu_header_local, per_cu);
25260 return cu_headerp->addr_size;
25263 /* Return the offset size given in the compilation unit header for CU. */
25266 dwarf2_per_cu_offset_size (struct dwarf2_per_cu_data *per_cu)
25268 struct comp_unit_head cu_header_local;
25269 const struct comp_unit_head *cu_headerp;
25271 cu_headerp = per_cu_header_read_in (&cu_header_local, per_cu);
25273 return cu_headerp->offset_size;
25276 /* See its dwarf2loc.h declaration. */
25279 dwarf2_per_cu_ref_addr_size (struct dwarf2_per_cu_data *per_cu)
25281 struct comp_unit_head cu_header_local;
25282 const struct comp_unit_head *cu_headerp;
25284 cu_headerp = per_cu_header_read_in (&cu_header_local, per_cu);
25286 if (cu_headerp->version == 2)
25287 return cu_headerp->addr_size;
25289 return cu_headerp->offset_size;
25292 /* Return the text offset of the CU. The returned offset comes from
25293 this CU's objfile. If this objfile came from a separate debuginfo
25294 file, then the offset may be different from the corresponding
25295 offset in the parent objfile. */
25298 dwarf2_per_cu_text_offset (struct dwarf2_per_cu_data *per_cu)
25300 struct objfile *objfile = per_cu->dwarf2_per_objfile->objfile;
25302 return ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
25305 /* Return DWARF version number of PER_CU. */
25308 dwarf2_version (struct dwarf2_per_cu_data *per_cu)
25310 return per_cu->dwarf_version;
25313 /* Locate the .debug_info compilation unit from CU's objfile which contains
25314 the DIE at OFFSET. Raises an error on failure. */
25316 static struct dwarf2_per_cu_data *
25317 dwarf2_find_containing_comp_unit (sect_offset sect_off,
25318 unsigned int offset_in_dwz,
25319 struct dwarf2_per_objfile *dwarf2_per_objfile)
25321 struct dwarf2_per_cu_data *this_cu;
25325 high = dwarf2_per_objfile->all_comp_units.size () - 1;
25328 struct dwarf2_per_cu_data *mid_cu;
25329 int mid = low + (high - low) / 2;
25331 mid_cu = dwarf2_per_objfile->all_comp_units[mid];
25332 if (mid_cu->is_dwz > offset_in_dwz
25333 || (mid_cu->is_dwz == offset_in_dwz
25334 && mid_cu->sect_off + mid_cu->length >= sect_off))
25339 gdb_assert (low == high);
25340 this_cu = dwarf2_per_objfile->all_comp_units[low];
25341 if (this_cu->is_dwz != offset_in_dwz || this_cu->sect_off > sect_off)
25343 if (low == 0 || this_cu->is_dwz != offset_in_dwz)
25344 error (_("Dwarf Error: could not find partial DIE containing "
25345 "offset %s [in module %s]"),
25346 sect_offset_str (sect_off),
25347 bfd_get_filename (dwarf2_per_objfile->objfile->obfd));
25349 gdb_assert (dwarf2_per_objfile->all_comp_units[low-1]->sect_off
25351 return dwarf2_per_objfile->all_comp_units[low-1];
25355 if (low == dwarf2_per_objfile->all_comp_units.size () - 1
25356 && sect_off >= this_cu->sect_off + this_cu->length)
25357 error (_("invalid dwarf2 offset %s"), sect_offset_str (sect_off));
25358 gdb_assert (sect_off < this_cu->sect_off + this_cu->length);
25363 /* Initialize dwarf2_cu CU, owned by PER_CU. */
25365 dwarf2_cu::dwarf2_cu (struct dwarf2_per_cu_data *per_cu_)
25366 : per_cu (per_cu_),
25368 has_loclist (false),
25369 checked_producer (false),
25370 producer_is_gxx_lt_4_6 (false),
25371 producer_is_gcc_lt_4_3 (false),
25372 producer_is_icc (false),
25373 producer_is_icc_lt_14 (false),
25374 producer_is_codewarrior (false),
25375 processing_has_namespace_info (false)
25380 /* Destroy a dwarf2_cu. */
25382 dwarf2_cu::~dwarf2_cu ()
25387 /* Initialize basic fields of dwarf_cu CU according to DIE COMP_UNIT_DIE. */
25390 prepare_one_comp_unit (struct dwarf2_cu *cu, struct die_info *comp_unit_die,
25391 enum language pretend_language)
25393 struct attribute *attr;
25395 /* Set the language we're debugging. */
25396 attr = dwarf2_attr (comp_unit_die, DW_AT_language, cu);
25398 set_cu_language (DW_UNSND (attr), cu);
25401 cu->language = pretend_language;
25402 cu->language_defn = language_def (cu->language);
25405 cu->producer = dwarf2_string_attr (comp_unit_die, DW_AT_producer, cu);
25408 /* Increase the age counter on each cached compilation unit, and free
25409 any that are too old. */
25412 age_cached_comp_units (struct dwarf2_per_objfile *dwarf2_per_objfile)
25414 struct dwarf2_per_cu_data *per_cu, **last_chain;
25416 dwarf2_clear_marks (dwarf2_per_objfile->read_in_chain);
25417 per_cu = dwarf2_per_objfile->read_in_chain;
25418 while (per_cu != NULL)
25420 per_cu->cu->last_used ++;
25421 if (per_cu->cu->last_used <= dwarf_max_cache_age)
25422 dwarf2_mark (per_cu->cu);
25423 per_cu = per_cu->cu->read_in_chain;
25426 per_cu = dwarf2_per_objfile->read_in_chain;
25427 last_chain = &dwarf2_per_objfile->read_in_chain;
25428 while (per_cu != NULL)
25430 struct dwarf2_per_cu_data *next_cu;
25432 next_cu = per_cu->cu->read_in_chain;
25434 if (!per_cu->cu->mark)
25437 *last_chain = next_cu;
25440 last_chain = &per_cu->cu->read_in_chain;
25446 /* Remove a single compilation unit from the cache. */
25449 free_one_cached_comp_unit (struct dwarf2_per_cu_data *target_per_cu)
25451 struct dwarf2_per_cu_data *per_cu, **last_chain;
25452 struct dwarf2_per_objfile *dwarf2_per_objfile
25453 = target_per_cu->dwarf2_per_objfile;
25455 per_cu = dwarf2_per_objfile->read_in_chain;
25456 last_chain = &dwarf2_per_objfile->read_in_chain;
25457 while (per_cu != NULL)
25459 struct dwarf2_per_cu_data *next_cu;
25461 next_cu = per_cu->cu->read_in_chain;
25463 if (per_cu == target_per_cu)
25467 *last_chain = next_cu;
25471 last_chain = &per_cu->cu->read_in_chain;
25477 /* A set of CU "per_cu" pointer, DIE offset, and GDB type pointer.
25478 We store these in a hash table separate from the DIEs, and preserve them
25479 when the DIEs are flushed out of cache.
25481 The CU "per_cu" pointer is needed because offset alone is not enough to
25482 uniquely identify the type. A file may have multiple .debug_types sections,
25483 or the type may come from a DWO file. Furthermore, while it's more logical
25484 to use per_cu->section+offset, with Fission the section with the data is in
25485 the DWO file but we don't know that section at the point we need it.
25486 We have to use something in dwarf2_per_cu_data (or the pointer to it)
25487 because we can enter the lookup routine, get_die_type_at_offset, from
25488 outside this file, and thus won't necessarily have PER_CU->cu.
25489 Fortunately, PER_CU is stable for the life of the objfile. */
25491 struct dwarf2_per_cu_offset_and_type
25493 const struct dwarf2_per_cu_data *per_cu;
25494 sect_offset sect_off;
25498 /* Hash function for a dwarf2_per_cu_offset_and_type. */
25501 per_cu_offset_and_type_hash (const void *item)
25503 const struct dwarf2_per_cu_offset_and_type *ofs
25504 = (const struct dwarf2_per_cu_offset_and_type *) item;
25506 return (uintptr_t) ofs->per_cu + to_underlying (ofs->sect_off);
25509 /* Equality function for a dwarf2_per_cu_offset_and_type. */
25512 per_cu_offset_and_type_eq (const void *item_lhs, const void *item_rhs)
25514 const struct dwarf2_per_cu_offset_and_type *ofs_lhs
25515 = (const struct dwarf2_per_cu_offset_and_type *) item_lhs;
25516 const struct dwarf2_per_cu_offset_and_type *ofs_rhs
25517 = (const struct dwarf2_per_cu_offset_and_type *) item_rhs;
25519 return (ofs_lhs->per_cu == ofs_rhs->per_cu
25520 && ofs_lhs->sect_off == ofs_rhs->sect_off);
25523 /* Set the type associated with DIE to TYPE. Save it in CU's hash
25524 table if necessary. For convenience, return TYPE.
25526 The DIEs reading must have careful ordering to:
25527 * Not cause infite loops trying to read in DIEs as a prerequisite for
25528 reading current DIE.
25529 * Not trying to dereference contents of still incompletely read in types
25530 while reading in other DIEs.
25531 * Enable referencing still incompletely read in types just by a pointer to
25532 the type without accessing its fields.
25534 Therefore caller should follow these rules:
25535 * Try to fetch any prerequisite types we may need to build this DIE type
25536 before building the type and calling set_die_type.
25537 * After building type call set_die_type for current DIE as soon as
25538 possible before fetching more types to complete the current type.
25539 * Make the type as complete as possible before fetching more types. */
25541 static struct type *
25542 set_die_type (struct die_info *die, struct type *type, struct dwarf2_cu *cu)
25544 struct dwarf2_per_objfile *dwarf2_per_objfile
25545 = cu->per_cu->dwarf2_per_objfile;
25546 struct dwarf2_per_cu_offset_and_type **slot, ofs;
25547 struct objfile *objfile = dwarf2_per_objfile->objfile;
25548 struct attribute *attr;
25549 struct dynamic_prop prop;
25551 /* For Ada types, make sure that the gnat-specific data is always
25552 initialized (if not already set). There are a few types where
25553 we should not be doing so, because the type-specific area is
25554 already used to hold some other piece of info (eg: TYPE_CODE_FLT
25555 where the type-specific area is used to store the floatformat).
25556 But this is not a problem, because the gnat-specific information
25557 is actually not needed for these types. */
25558 if (need_gnat_info (cu)
25559 && TYPE_CODE (type) != TYPE_CODE_FUNC
25560 && TYPE_CODE (type) != TYPE_CODE_FLT
25561 && TYPE_CODE (type) != TYPE_CODE_METHODPTR
25562 && TYPE_CODE (type) != TYPE_CODE_MEMBERPTR
25563 && TYPE_CODE (type) != TYPE_CODE_METHOD
25564 && !HAVE_GNAT_AUX_INFO (type))
25565 INIT_GNAT_SPECIFIC (type);
25567 /* Read DW_AT_allocated and set in type. */
25568 attr = dwarf2_attr (die, DW_AT_allocated, cu);
25569 if (attr_form_is_block (attr))
25571 if (attr_to_dynamic_prop (attr, die, cu, &prop))
25572 add_dyn_prop (DYN_PROP_ALLOCATED, prop, type);
25574 else if (attr != NULL)
25576 complaint (_("DW_AT_allocated has the wrong form (%s) at DIE %s"),
25577 (attr != NULL ? dwarf_form_name (attr->form) : "n/a"),
25578 sect_offset_str (die->sect_off));
25581 /* Read DW_AT_associated and set in type. */
25582 attr = dwarf2_attr (die, DW_AT_associated, cu);
25583 if (attr_form_is_block (attr))
25585 if (attr_to_dynamic_prop (attr, die, cu, &prop))
25586 add_dyn_prop (DYN_PROP_ASSOCIATED, prop, type);
25588 else if (attr != NULL)
25590 complaint (_("DW_AT_associated has the wrong form (%s) at DIE %s"),
25591 (attr != NULL ? dwarf_form_name (attr->form) : "n/a"),
25592 sect_offset_str (die->sect_off));
25595 /* Read DW_AT_data_location and set in type. */
25596 attr = dwarf2_attr (die, DW_AT_data_location, cu);
25597 if (attr_to_dynamic_prop (attr, die, cu, &prop))
25598 add_dyn_prop (DYN_PROP_DATA_LOCATION, prop, type);
25600 if (dwarf2_per_objfile->die_type_hash == NULL)
25602 dwarf2_per_objfile->die_type_hash =
25603 htab_create_alloc_ex (127,
25604 per_cu_offset_and_type_hash,
25605 per_cu_offset_and_type_eq,
25607 &objfile->objfile_obstack,
25608 hashtab_obstack_allocate,
25609 dummy_obstack_deallocate);
25612 ofs.per_cu = cu->per_cu;
25613 ofs.sect_off = die->sect_off;
25615 slot = (struct dwarf2_per_cu_offset_and_type **)
25616 htab_find_slot (dwarf2_per_objfile->die_type_hash, &ofs, INSERT);
25618 complaint (_("A problem internal to GDB: DIE %s has type already set"),
25619 sect_offset_str (die->sect_off));
25620 *slot = XOBNEW (&objfile->objfile_obstack,
25621 struct dwarf2_per_cu_offset_and_type);
25626 /* Look up the type for the die at SECT_OFF in PER_CU in die_type_hash,
25627 or return NULL if the die does not have a saved type. */
25629 static struct type *
25630 get_die_type_at_offset (sect_offset sect_off,
25631 struct dwarf2_per_cu_data *per_cu)
25633 struct dwarf2_per_cu_offset_and_type *slot, ofs;
25634 struct dwarf2_per_objfile *dwarf2_per_objfile = per_cu->dwarf2_per_objfile;
25636 if (dwarf2_per_objfile->die_type_hash == NULL)
25639 ofs.per_cu = per_cu;
25640 ofs.sect_off = sect_off;
25641 slot = ((struct dwarf2_per_cu_offset_and_type *)
25642 htab_find (dwarf2_per_objfile->die_type_hash, &ofs));
25649 /* Look up the type for DIE in CU in die_type_hash,
25650 or return NULL if DIE does not have a saved type. */
25652 static struct type *
25653 get_die_type (struct die_info *die, struct dwarf2_cu *cu)
25655 return get_die_type_at_offset (die->sect_off, cu->per_cu);
25658 /* Add a dependence relationship from CU to REF_PER_CU. */
25661 dwarf2_add_dependence (struct dwarf2_cu *cu,
25662 struct dwarf2_per_cu_data *ref_per_cu)
25666 if (cu->dependencies == NULL)
25668 = htab_create_alloc_ex (5, htab_hash_pointer, htab_eq_pointer,
25669 NULL, &cu->comp_unit_obstack,
25670 hashtab_obstack_allocate,
25671 dummy_obstack_deallocate);
25673 slot = htab_find_slot (cu->dependencies, ref_per_cu, INSERT);
25675 *slot = ref_per_cu;
25678 /* Subroutine of dwarf2_mark to pass to htab_traverse.
25679 Set the mark field in every compilation unit in the
25680 cache that we must keep because we are keeping CU. */
25683 dwarf2_mark_helper (void **slot, void *data)
25685 struct dwarf2_per_cu_data *per_cu;
25687 per_cu = (struct dwarf2_per_cu_data *) *slot;
25689 /* cu->dependencies references may not yet have been ever read if QUIT aborts
25690 reading of the chain. As such dependencies remain valid it is not much
25691 useful to track and undo them during QUIT cleanups. */
25692 if (per_cu->cu == NULL)
25695 if (per_cu->cu->mark)
25697 per_cu->cu->mark = true;
25699 if (per_cu->cu->dependencies != NULL)
25700 htab_traverse (per_cu->cu->dependencies, dwarf2_mark_helper, NULL);
25705 /* Set the mark field in CU and in every other compilation unit in the
25706 cache that we must keep because we are keeping CU. */
25709 dwarf2_mark (struct dwarf2_cu *cu)
25714 if (cu->dependencies != NULL)
25715 htab_traverse (cu->dependencies, dwarf2_mark_helper, NULL);
25719 dwarf2_clear_marks (struct dwarf2_per_cu_data *per_cu)
25723 per_cu->cu->mark = false;
25724 per_cu = per_cu->cu->read_in_chain;
25728 /* Trivial hash function for partial_die_info: the hash value of a DIE
25729 is its offset in .debug_info for this objfile. */
25732 partial_die_hash (const void *item)
25734 const struct partial_die_info *part_die
25735 = (const struct partial_die_info *) item;
25737 return to_underlying (part_die->sect_off);
25740 /* Trivial comparison function for partial_die_info structures: two DIEs
25741 are equal if they have the same offset. */
25744 partial_die_eq (const void *item_lhs, const void *item_rhs)
25746 const struct partial_die_info *part_die_lhs
25747 = (const struct partial_die_info *) item_lhs;
25748 const struct partial_die_info *part_die_rhs
25749 = (const struct partial_die_info *) item_rhs;
25751 return part_die_lhs->sect_off == part_die_rhs->sect_off;
25754 struct cmd_list_element *set_dwarf_cmdlist;
25755 struct cmd_list_element *show_dwarf_cmdlist;
25758 set_dwarf_cmd (const char *args, int from_tty)
25760 help_list (set_dwarf_cmdlist, "maintenance set dwarf ", all_commands,
25765 show_dwarf_cmd (const char *args, int from_tty)
25767 cmd_show_list (show_dwarf_cmdlist, from_tty, "");
25770 int dwarf_always_disassemble;
25773 show_dwarf_always_disassemble (struct ui_file *file, int from_tty,
25774 struct cmd_list_element *c, const char *value)
25776 fprintf_filtered (file,
25777 _("Whether to always disassemble "
25778 "DWARF expressions is %s.\n"),
25783 show_check_physname (struct ui_file *file, int from_tty,
25784 struct cmd_list_element *c, const char *value)
25786 fprintf_filtered (file,
25787 _("Whether to check \"physname\" is %s.\n"),
25792 _initialize_dwarf2_read (void)
25794 add_prefix_cmd ("dwarf", class_maintenance, set_dwarf_cmd, _("\
25795 Set DWARF specific variables.\n\
25796 Configure DWARF variables such as the cache size"),
25797 &set_dwarf_cmdlist, "maintenance set dwarf ",
25798 0/*allow-unknown*/, &maintenance_set_cmdlist);
25800 add_prefix_cmd ("dwarf", class_maintenance, show_dwarf_cmd, _("\
25801 Show DWARF specific variables\n\
25802 Show DWARF variables such as the cache size"),
25803 &show_dwarf_cmdlist, "maintenance show dwarf ",
25804 0/*allow-unknown*/, &maintenance_show_cmdlist);
25806 add_setshow_zinteger_cmd ("max-cache-age", class_obscure,
25807 &dwarf_max_cache_age, _("\
25808 Set the upper bound on the age of cached DWARF compilation units."), _("\
25809 Show the upper bound on the age of cached DWARF compilation units."), _("\
25810 A higher limit means that cached compilation units will be stored\n\
25811 in memory longer, and more total memory will be used. Zero disables\n\
25812 caching, which can slow down startup."),
25814 show_dwarf_max_cache_age,
25815 &set_dwarf_cmdlist,
25816 &show_dwarf_cmdlist);
25818 add_setshow_boolean_cmd ("always-disassemble", class_obscure,
25819 &dwarf_always_disassemble, _("\
25820 Set whether `info address' always disassembles DWARF expressions."), _("\
25821 Show whether `info address' always disassembles DWARF expressions."), _("\
25822 When enabled, DWARF expressions are always printed in an assembly-like\n\
25823 syntax. When disabled, expressions will be printed in a more\n\
25824 conversational style, when possible."),
25826 show_dwarf_always_disassemble,
25827 &set_dwarf_cmdlist,
25828 &show_dwarf_cmdlist);
25830 add_setshow_zuinteger_cmd ("dwarf-read", no_class, &dwarf_read_debug, _("\
25831 Set debugging of the DWARF reader."), _("\
25832 Show debugging of the DWARF reader."), _("\
25833 When enabled (non-zero), debugging messages are printed during DWARF\n\
25834 reading and symtab expansion. A value of 1 (one) provides basic\n\
25835 information. A value greater than 1 provides more verbose information."),
25838 &setdebuglist, &showdebuglist);
25840 add_setshow_zuinteger_cmd ("dwarf-die", no_class, &dwarf_die_debug, _("\
25841 Set debugging of the DWARF DIE reader."), _("\
25842 Show debugging of the DWARF DIE reader."), _("\
25843 When enabled (non-zero), DIEs are dumped after they are read in.\n\
25844 The value is the maximum depth to print."),
25847 &setdebuglist, &showdebuglist);
25849 add_setshow_zuinteger_cmd ("dwarf-line", no_class, &dwarf_line_debug, _("\
25850 Set debugging of the dwarf line reader."), _("\
25851 Show debugging of the dwarf line reader."), _("\
25852 When enabled (non-zero), line number entries are dumped as they are read in.\n\
25853 A value of 1 (one) provides basic information.\n\
25854 A value greater than 1 provides more verbose information."),
25857 &setdebuglist, &showdebuglist);
25859 add_setshow_boolean_cmd ("check-physname", no_class, &check_physname, _("\
25860 Set cross-checking of \"physname\" code against demangler."), _("\
25861 Show cross-checking of \"physname\" code against demangler."), _("\
25862 When enabled, GDB's internal \"physname\" code is checked against\n\
25864 NULL, show_check_physname,
25865 &setdebuglist, &showdebuglist);
25867 add_setshow_boolean_cmd ("use-deprecated-index-sections",
25868 no_class, &use_deprecated_index_sections, _("\
25869 Set whether to use deprecated gdb_index sections."), _("\
25870 Show whether to use deprecated gdb_index sections."), _("\
25871 When enabled, deprecated .gdb_index sections are used anyway.\n\
25872 Normally they are ignored either because of a missing feature or\n\
25873 performance issue.\n\
25874 Warning: This option must be enabled before gdb reads the file."),
25877 &setlist, &showlist);
25879 dwarf2_locexpr_index = register_symbol_computed_impl (LOC_COMPUTED,
25880 &dwarf2_locexpr_funcs);
25881 dwarf2_loclist_index = register_symbol_computed_impl (LOC_COMPUTED,
25882 &dwarf2_loclist_funcs);
25884 dwarf2_locexpr_block_index = register_symbol_block_impl (LOC_BLOCK,
25885 &dwarf2_block_frame_base_locexpr_funcs);
25886 dwarf2_loclist_block_index = register_symbol_block_impl (LOC_BLOCK,
25887 &dwarf2_block_frame_base_loclist_funcs);
25890 selftests::register_test ("dw2_expand_symtabs_matching",
25891 selftests::dw2_expand_symtabs_matching::run_test);