1 /* DWARF 2 debugging format support for GDB.
3 Copyright (C) 1994-2018 Free Software Foundation, Inc.
5 Adapted by Gary Funck (gary@intrepid.com), Intrepid Technology,
6 Inc. with support from Florida State University (under contract
7 with the Ada Joint Program Office), and Silicon Graphics, Inc.
8 Initial contribution by Brent Benson, Harris Computer Systems, Inc.,
9 based on Fred Fish's (Cygnus Support) implementation of DWARF 1
12 This file is part of GDB.
14 This program is free software; you can redistribute it and/or modify
15 it under the terms of the GNU General Public License as published by
16 the Free Software Foundation; either version 3 of the License, or
17 (at your option) any later version.
19 This program is distributed in the hope that it will be useful,
20 but WITHOUT ANY WARRANTY; without even the implied warranty of
21 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
22 GNU General Public License for more details.
24 You should have received a copy of the GNU General Public License
25 along with this program. If not, see <http://www.gnu.org/licenses/>. */
27 /* FIXME: Various die-reading functions need to be more careful with
28 reading off the end of the section.
29 E.g., load_partial_dies, read_partial_die. */
32 #include "dwarf2read.h"
33 #include "dwarf-index-common.h"
42 #include "gdb-demangle.h"
43 #include "expression.h"
44 #include "filenames.h" /* for DOSish file names */
47 #include "complaints.h"
49 #include "dwarf2expr.h"
50 #include "dwarf2loc.h"
51 #include "cp-support.h"
57 #include "typeprint.h"
60 #include "completer.h"
65 #include "gdbcore.h" /* for gnutarget */
66 #include "gdb/gdb-index.h"
71 #include "filestuff.h"
73 #include "namespace.h"
74 #include "common/gdb_unlinker.h"
75 #include "common/function-view.h"
76 #include "common/gdb_optional.h"
77 #include "common/underlying.h"
78 #include "common/byte-vector.h"
79 #include "common/hash_enum.h"
80 #include "filename-seen-cache.h"
83 #include <sys/types.h>
85 #include <unordered_set>
86 #include <unordered_map>
90 #include <forward_list>
91 #include "rust-lang.h"
92 #include "common/pathstuff.h"
94 /* When == 1, print basic high level tracing messages.
95 When > 1, be more verbose.
96 This is in contrast to the low level DIE reading of dwarf_die_debug. */
97 static unsigned int dwarf_read_debug = 0;
99 /* When non-zero, dump DIEs after they are read in. */
100 static unsigned int dwarf_die_debug = 0;
102 /* When non-zero, dump line number entries as they are read in. */
103 static unsigned int dwarf_line_debug = 0;
105 /* When non-zero, cross-check physname against demangler. */
106 static int check_physname = 0;
108 /* When non-zero, do not reject deprecated .gdb_index sections. */
109 static int use_deprecated_index_sections = 0;
111 static const struct objfile_data *dwarf2_objfile_data_key;
113 /* The "aclass" indices for various kinds of computed DWARF symbols. */
115 static int dwarf2_locexpr_index;
116 static int dwarf2_loclist_index;
117 static int dwarf2_locexpr_block_index;
118 static int dwarf2_loclist_block_index;
120 /* An index into a (C++) symbol name component in a symbol name as
121 recorded in the mapped_index's symbol table. For each C++ symbol
122 in the symbol table, we record one entry for the start of each
123 component in the symbol in a table of name components, and then
124 sort the table, in order to be able to binary search symbol names,
125 ignoring leading namespaces, both completion and regular look up.
126 For example, for symbol "A::B::C", we'll have an entry that points
127 to "A::B::C", another that points to "B::C", and another for "C".
128 Note that function symbols in GDB index have no parameter
129 information, just the function/method names. You can convert a
130 name_component to a "const char *" using the
131 'mapped_index::symbol_name_at(offset_type)' method. */
133 struct name_component
135 /* Offset in the symbol name where the component starts. Stored as
136 a (32-bit) offset instead of a pointer to save memory and improve
137 locality on 64-bit architectures. */
138 offset_type name_offset;
140 /* The symbol's index in the symbol and constant pool tables of a
145 /* Base class containing bits shared by both .gdb_index and
146 .debug_name indexes. */
148 struct mapped_index_base
150 /* The name_component table (a sorted vector). See name_component's
151 description above. */
152 std::vector<name_component> name_components;
154 /* How NAME_COMPONENTS is sorted. */
155 enum case_sensitivity name_components_casing;
157 /* Return the number of names in the symbol table. */
158 virtual size_t symbol_name_count () const = 0;
160 /* Get the name of the symbol at IDX in the symbol table. */
161 virtual const char *symbol_name_at (offset_type idx) const = 0;
163 /* Return whether the name at IDX in the symbol table should be
165 virtual bool symbol_name_slot_invalid (offset_type idx) const
170 /* Build the symbol name component sorted vector, if we haven't
172 void build_name_components ();
174 /* Returns the lower (inclusive) and upper (exclusive) bounds of the
175 possible matches for LN_NO_PARAMS in the name component
177 std::pair<std::vector<name_component>::const_iterator,
178 std::vector<name_component>::const_iterator>
179 find_name_components_bounds (const lookup_name_info &ln_no_params) const;
181 /* Prevent deleting/destroying via a base class pointer. */
183 ~mapped_index_base() = default;
186 /* A description of the mapped index. The file format is described in
187 a comment by the code that writes the index. */
188 struct mapped_index final : public mapped_index_base
190 /* A slot/bucket in the symbol table hash. */
191 struct symbol_table_slot
193 const offset_type name;
194 const offset_type vec;
197 /* Index data format version. */
200 /* The address table data. */
201 gdb::array_view<const gdb_byte> address_table;
203 /* The symbol table, implemented as a hash table. */
204 gdb::array_view<symbol_table_slot> symbol_table;
206 /* A pointer to the constant pool. */
207 const char *constant_pool = nullptr;
209 bool symbol_name_slot_invalid (offset_type idx) const override
211 const auto &bucket = this->symbol_table[idx];
212 return bucket.name == 0 && bucket.vec;
215 /* Convenience method to get at the name of the symbol at IDX in the
217 const char *symbol_name_at (offset_type idx) const override
218 { return this->constant_pool + MAYBE_SWAP (this->symbol_table[idx].name); }
220 size_t symbol_name_count () const override
221 { return this->symbol_table.size (); }
224 /* A description of the mapped .debug_names.
225 Uninitialized map has CU_COUNT 0. */
226 struct mapped_debug_names final : public mapped_index_base
228 mapped_debug_names (struct dwarf2_per_objfile *dwarf2_per_objfile_)
229 : dwarf2_per_objfile (dwarf2_per_objfile_)
232 struct dwarf2_per_objfile *dwarf2_per_objfile;
233 bfd_endian dwarf5_byte_order;
234 bool dwarf5_is_dwarf64;
235 bool augmentation_is_gdb;
237 uint32_t cu_count = 0;
238 uint32_t tu_count, bucket_count, name_count;
239 const gdb_byte *cu_table_reordered, *tu_table_reordered;
240 const uint32_t *bucket_table_reordered, *hash_table_reordered;
241 const gdb_byte *name_table_string_offs_reordered;
242 const gdb_byte *name_table_entry_offs_reordered;
243 const gdb_byte *entry_pool;
250 /* Attribute name DW_IDX_*. */
253 /* Attribute form DW_FORM_*. */
256 /* Value if FORM is DW_FORM_implicit_const. */
257 LONGEST implicit_const;
259 std::vector<attr> attr_vec;
262 std::unordered_map<ULONGEST, index_val> abbrev_map;
264 const char *namei_to_name (uint32_t namei) const;
266 /* Implementation of the mapped_index_base virtual interface, for
267 the name_components cache. */
269 const char *symbol_name_at (offset_type idx) const override
270 { return namei_to_name (idx); }
272 size_t symbol_name_count () const override
273 { return this->name_count; }
276 /* See dwarf2read.h. */
279 get_dwarf2_per_objfile (struct objfile *objfile)
281 return ((struct dwarf2_per_objfile *)
282 objfile_data (objfile, dwarf2_objfile_data_key));
285 /* Set the dwarf2_per_objfile associated to OBJFILE. */
288 set_dwarf2_per_objfile (struct objfile *objfile,
289 struct dwarf2_per_objfile *dwarf2_per_objfile)
291 gdb_assert (get_dwarf2_per_objfile (objfile) == NULL);
292 set_objfile_data (objfile, dwarf2_objfile_data_key, dwarf2_per_objfile);
295 /* Default names of the debugging sections. */
297 /* Note that if the debugging section has been compressed, it might
298 have a name like .zdebug_info. */
300 static const struct dwarf2_debug_sections dwarf2_elf_names =
302 { ".debug_info", ".zdebug_info" },
303 { ".debug_abbrev", ".zdebug_abbrev" },
304 { ".debug_line", ".zdebug_line" },
305 { ".debug_loc", ".zdebug_loc" },
306 { ".debug_loclists", ".zdebug_loclists" },
307 { ".debug_macinfo", ".zdebug_macinfo" },
308 { ".debug_macro", ".zdebug_macro" },
309 { ".debug_str", ".zdebug_str" },
310 { ".debug_line_str", ".zdebug_line_str" },
311 { ".debug_ranges", ".zdebug_ranges" },
312 { ".debug_rnglists", ".zdebug_rnglists" },
313 { ".debug_types", ".zdebug_types" },
314 { ".debug_addr", ".zdebug_addr" },
315 { ".debug_frame", ".zdebug_frame" },
316 { ".eh_frame", NULL },
317 { ".gdb_index", ".zgdb_index" },
318 { ".debug_names", ".zdebug_names" },
319 { ".debug_aranges", ".zdebug_aranges" },
323 /* List of DWO/DWP sections. */
325 static const struct dwop_section_names
327 struct dwarf2_section_names abbrev_dwo;
328 struct dwarf2_section_names info_dwo;
329 struct dwarf2_section_names line_dwo;
330 struct dwarf2_section_names loc_dwo;
331 struct dwarf2_section_names loclists_dwo;
332 struct dwarf2_section_names macinfo_dwo;
333 struct dwarf2_section_names macro_dwo;
334 struct dwarf2_section_names str_dwo;
335 struct dwarf2_section_names str_offsets_dwo;
336 struct dwarf2_section_names types_dwo;
337 struct dwarf2_section_names cu_index;
338 struct dwarf2_section_names tu_index;
342 { ".debug_abbrev.dwo", ".zdebug_abbrev.dwo" },
343 { ".debug_info.dwo", ".zdebug_info.dwo" },
344 { ".debug_line.dwo", ".zdebug_line.dwo" },
345 { ".debug_loc.dwo", ".zdebug_loc.dwo" },
346 { ".debug_loclists.dwo", ".zdebug_loclists.dwo" },
347 { ".debug_macinfo.dwo", ".zdebug_macinfo.dwo" },
348 { ".debug_macro.dwo", ".zdebug_macro.dwo" },
349 { ".debug_str.dwo", ".zdebug_str.dwo" },
350 { ".debug_str_offsets.dwo", ".zdebug_str_offsets.dwo" },
351 { ".debug_types.dwo", ".zdebug_types.dwo" },
352 { ".debug_cu_index", ".zdebug_cu_index" },
353 { ".debug_tu_index", ".zdebug_tu_index" },
356 /* local data types */
358 /* The data in a compilation unit header, after target2host
359 translation, looks like this. */
360 struct comp_unit_head
364 unsigned char addr_size;
365 unsigned char signed_addr_p;
366 sect_offset abbrev_sect_off;
368 /* Size of file offsets; either 4 or 8. */
369 unsigned int offset_size;
371 /* Size of the length field; either 4 or 12. */
372 unsigned int initial_length_size;
374 enum dwarf_unit_type unit_type;
376 /* Offset to the first byte of this compilation unit header in the
377 .debug_info section, for resolving relative reference dies. */
378 sect_offset sect_off;
380 /* Offset to first die in this cu from the start of the cu.
381 This will be the first byte following the compilation unit header. */
382 cu_offset first_die_cu_offset;
384 /* 64-bit signature of this type unit - it is valid only for
385 UNIT_TYPE DW_UT_type. */
388 /* For types, offset in the type's DIE of the type defined by this TU. */
389 cu_offset type_cu_offset_in_tu;
392 /* Type used for delaying computation of method physnames.
393 See comments for compute_delayed_physnames. */
394 struct delayed_method_info
396 /* The type to which the method is attached, i.e., its parent class. */
399 /* The index of the method in the type's function fieldlists. */
402 /* The index of the method in the fieldlist. */
405 /* The name of the DIE. */
408 /* The DIE associated with this method. */
409 struct die_info *die;
412 /* Internal state when decoding a particular compilation unit. */
415 explicit dwarf2_cu (struct dwarf2_per_cu_data *per_cu);
418 DISABLE_COPY_AND_ASSIGN (dwarf2_cu);
420 /* The header of the compilation unit. */
421 struct comp_unit_head header {};
423 /* Base address of this compilation unit. */
424 CORE_ADDR base_address = 0;
426 /* Non-zero if base_address has been set. */
429 /* The language we are debugging. */
430 enum language language = language_unknown;
431 const struct language_defn *language_defn = nullptr;
433 const char *producer = nullptr;
435 /* The generic symbol table building routines have separate lists for
436 file scope symbols and all all other scopes (local scopes). So
437 we need to select the right one to pass to add_symbol_to_list().
438 We do it by keeping a pointer to the correct list in list_in_scope.
440 FIXME: The original dwarf code just treated the file scope as the
441 first local scope, and all other local scopes as nested local
442 scopes, and worked fine. Check to see if we really need to
443 distinguish these in buildsym.c. */
444 struct pending **list_in_scope = nullptr;
446 /* Hash table holding all the loaded partial DIEs
447 with partial_die->offset.SECT_OFF as hash. */
448 htab_t partial_dies = nullptr;
450 /* Storage for things with the same lifetime as this read-in compilation
451 unit, including partial DIEs. */
452 auto_obstack comp_unit_obstack;
454 /* When multiple dwarf2_cu structures are living in memory, this field
455 chains them all together, so that they can be released efficiently.
456 We will probably also want a generation counter so that most-recently-used
457 compilation units are cached... */
458 struct dwarf2_per_cu_data *read_in_chain = nullptr;
460 /* Backlink to our per_cu entry. */
461 struct dwarf2_per_cu_data *per_cu;
463 /* How many compilation units ago was this CU last referenced? */
466 /* A hash table of DIE cu_offset for following references with
467 die_info->offset.sect_off as hash. */
468 htab_t die_hash = nullptr;
470 /* Full DIEs if read in. */
471 struct die_info *dies = nullptr;
473 /* A set of pointers to dwarf2_per_cu_data objects for compilation
474 units referenced by this one. Only set during full symbol processing;
475 partial symbol tables do not have dependencies. */
476 htab_t dependencies = nullptr;
478 /* Header data from the line table, during full symbol processing. */
479 struct line_header *line_header = nullptr;
480 /* Non-NULL if LINE_HEADER is owned by this DWARF_CU. Otherwise,
481 it's owned by dwarf2_per_objfile::line_header_hash. If non-NULL,
482 this is the DW_TAG_compile_unit die for this CU. We'll hold on
483 to the line header as long as this DIE is being processed. See
484 process_die_scope. */
485 die_info *line_header_die_owner = nullptr;
487 /* A list of methods which need to have physnames computed
488 after all type information has been read. */
489 std::vector<delayed_method_info> method_list;
491 /* To be copied to symtab->call_site_htab. */
492 htab_t call_site_htab = nullptr;
494 /* Non-NULL if this CU came from a DWO file.
495 There is an invariant here that is important to remember:
496 Except for attributes copied from the top level DIE in the "main"
497 (or "stub") file in preparation for reading the DWO file
498 (e.g., DW_AT_GNU_addr_base), we KISS: there is only *one* CU.
499 Either there isn't a DWO file (in which case this is NULL and the point
500 is moot), or there is and either we're not going to read it (in which
501 case this is NULL) or there is and we are reading it (in which case this
503 struct dwo_unit *dwo_unit = nullptr;
505 /* The DW_AT_addr_base attribute if present, zero otherwise
506 (zero is a valid value though).
507 Note this value comes from the Fission stub CU/TU's DIE. */
508 ULONGEST addr_base = 0;
510 /* The DW_AT_ranges_base attribute if present, zero otherwise
511 (zero is a valid value though).
512 Note this value comes from the Fission stub CU/TU's DIE.
513 Also note that the value is zero in the non-DWO case so this value can
514 be used without needing to know whether DWO files are in use or not.
515 N.B. This does not apply to DW_AT_ranges appearing in
516 DW_TAG_compile_unit dies. This is a bit of a wart, consider if ever
517 DW_AT_ranges appeared in the DW_TAG_compile_unit of DWO DIEs: then
518 DW_AT_ranges_base *would* have to be applied, and we'd have to care
519 whether the DW_AT_ranges attribute came from the skeleton or DWO. */
520 ULONGEST ranges_base = 0;
522 /* When reading debug info generated by older versions of rustc, we
523 have to rewrite some union types to be struct types with a
524 variant part. This rewriting must be done after the CU is fully
525 read in, because otherwise at the point of rewriting some struct
526 type might not have been fully processed. So, we keep a list of
527 all such types here and process them after expansion. */
528 std::vector<struct type *> rust_unions;
530 /* Mark used when releasing cached dies. */
531 unsigned int mark : 1;
533 /* This CU references .debug_loc. See the symtab->locations_valid field.
534 This test is imperfect as there may exist optimized debug code not using
535 any location list and still facing inlining issues if handled as
536 unoptimized code. For a future better test see GCC PR other/32998. */
537 unsigned int has_loclist : 1;
539 /* These cache the results for producer_is_* fields. CHECKED_PRODUCER is set
540 if all the producer_is_* fields are valid. This information is cached
541 because profiling CU expansion showed excessive time spent in
542 producer_is_gxx_lt_4_6. */
543 unsigned int checked_producer : 1;
544 unsigned int producer_is_gxx_lt_4_6 : 1;
545 unsigned int producer_is_gcc_lt_4_3 : 1;
546 unsigned int producer_is_icc_lt_14 : 1;
548 /* When set, the file that we're processing is known to have
549 debugging info for C++ namespaces. GCC 3.3.x did not produce
550 this information, but later versions do. */
552 unsigned int processing_has_namespace_info : 1;
554 struct partial_die_info *find_partial_die (sect_offset sect_off);
557 /* A struct that can be used as a hash key for tables based on DW_AT_stmt_list.
558 This includes type_unit_group and quick_file_names. */
560 struct stmt_list_hash
562 /* The DWO unit this table is from or NULL if there is none. */
563 struct dwo_unit *dwo_unit;
565 /* Offset in .debug_line or .debug_line.dwo. */
566 sect_offset line_sect_off;
569 /* Each element of dwarf2_per_objfile->type_unit_groups is a pointer to
570 an object of this type. */
572 struct type_unit_group
574 /* dwarf2read.c's main "handle" on a TU symtab.
575 To simplify things we create an artificial CU that "includes" all the
576 type units using this stmt_list so that the rest of the code still has
577 a "per_cu" handle on the symtab.
578 This PER_CU is recognized by having no section. */
579 #define IS_TYPE_UNIT_GROUP(per_cu) ((per_cu)->section == NULL)
580 struct dwarf2_per_cu_data per_cu;
582 /* The TUs that share this DW_AT_stmt_list entry.
583 This is added to while parsing type units to build partial symtabs,
584 and is deleted afterwards and not used again. */
585 VEC (sig_type_ptr) *tus;
587 /* The compunit symtab.
588 Type units in a group needn't all be defined in the same source file,
589 so we create an essentially anonymous symtab as the compunit symtab. */
590 struct compunit_symtab *compunit_symtab;
592 /* The data used to construct the hash key. */
593 struct stmt_list_hash hash;
595 /* The number of symtabs from the line header.
596 The value here must match line_header.num_file_names. */
597 unsigned int num_symtabs;
599 /* The symbol tables for this TU (obtained from the files listed in
601 WARNING: The order of entries here must match the order of entries
602 in the line header. After the first TU using this type_unit_group, the
603 line header for the subsequent TUs is recreated from this. This is done
604 because we need to use the same symtabs for each TU using the same
605 DW_AT_stmt_list value. Also note that symtabs may be repeated here,
606 there's no guarantee the line header doesn't have duplicate entries. */
607 struct symtab **symtabs;
610 /* These sections are what may appear in a (real or virtual) DWO file. */
614 struct dwarf2_section_info abbrev;
615 struct dwarf2_section_info line;
616 struct dwarf2_section_info loc;
617 struct dwarf2_section_info loclists;
618 struct dwarf2_section_info macinfo;
619 struct dwarf2_section_info macro;
620 struct dwarf2_section_info str;
621 struct dwarf2_section_info str_offsets;
622 /* In the case of a virtual DWO file, these two are unused. */
623 struct dwarf2_section_info info;
624 VEC (dwarf2_section_info_def) *types;
627 /* CUs/TUs in DWP/DWO files. */
631 /* Backlink to the containing struct dwo_file. */
632 struct dwo_file *dwo_file;
634 /* The "id" that distinguishes this CU/TU.
635 .debug_info calls this "dwo_id", .debug_types calls this "signature".
636 Since signatures came first, we stick with it for consistency. */
639 /* The section this CU/TU lives in, in the DWO file. */
640 struct dwarf2_section_info *section;
642 /* Same as dwarf2_per_cu_data:{sect_off,length} but in the DWO section. */
643 sect_offset sect_off;
646 /* For types, offset in the type's DIE of the type defined by this TU. */
647 cu_offset type_offset_in_tu;
650 /* include/dwarf2.h defines the DWP section codes.
651 It defines a max value but it doesn't define a min value, which we
652 use for error checking, so provide one. */
654 enum dwp_v2_section_ids
659 /* Data for one DWO file.
661 This includes virtual DWO files (a virtual DWO file is a DWO file as it
662 appears in a DWP file). DWP files don't really have DWO files per se -
663 comdat folding of types "loses" the DWO file they came from, and from
664 a high level view DWP files appear to contain a mass of random types.
665 However, to maintain consistency with the non-DWP case we pretend DWP
666 files contain virtual DWO files, and we assign each TU with one virtual
667 DWO file (generally based on the line and abbrev section offsets -
668 a heuristic that seems to work in practice). */
672 /* The DW_AT_GNU_dwo_name attribute.
673 For virtual DWO files the name is constructed from the section offsets
674 of abbrev,line,loc,str_offsets so that we combine virtual DWO files
675 from related CU+TUs. */
676 const char *dwo_name;
678 /* The DW_AT_comp_dir attribute. */
679 const char *comp_dir;
681 /* The bfd, when the file is open. Otherwise this is NULL.
682 This is unused(NULL) for virtual DWO files where we use dwp_file.dbfd. */
685 /* The sections that make up this DWO file.
686 Remember that for virtual DWO files in DWP V2, these are virtual
687 sections (for lack of a better name). */
688 struct dwo_sections sections;
690 /* The CUs in the file.
691 Each element is a struct dwo_unit. Multiple CUs per DWO are supported as
692 an extension to handle LLVM's Link Time Optimization output (where
693 multiple source files may be compiled into a single object/dwo pair). */
696 /* Table of TUs in the file.
697 Each element is a struct dwo_unit. */
701 /* These sections are what may appear in a DWP file. */
705 /* These are used by both DWP version 1 and 2. */
706 struct dwarf2_section_info str;
707 struct dwarf2_section_info cu_index;
708 struct dwarf2_section_info tu_index;
710 /* These are only used by DWP version 2 files.
711 In DWP version 1 the .debug_info.dwo, .debug_types.dwo, and other
712 sections are referenced by section number, and are not recorded here.
713 In DWP version 2 there is at most one copy of all these sections, each
714 section being (effectively) comprised of the concatenation of all of the
715 individual sections that exist in the version 1 format.
716 To keep the code simple we treat each of these concatenated pieces as a
717 section itself (a virtual section?). */
718 struct dwarf2_section_info abbrev;
719 struct dwarf2_section_info info;
720 struct dwarf2_section_info line;
721 struct dwarf2_section_info loc;
722 struct dwarf2_section_info macinfo;
723 struct dwarf2_section_info macro;
724 struct dwarf2_section_info str_offsets;
725 struct dwarf2_section_info types;
728 /* These sections are what may appear in a virtual DWO file in DWP version 1.
729 A virtual DWO file is a DWO file as it appears in a DWP file. */
731 struct virtual_v1_dwo_sections
733 struct dwarf2_section_info abbrev;
734 struct dwarf2_section_info line;
735 struct dwarf2_section_info loc;
736 struct dwarf2_section_info macinfo;
737 struct dwarf2_section_info macro;
738 struct dwarf2_section_info str_offsets;
739 /* Each DWP hash table entry records one CU or one TU.
740 That is recorded here, and copied to dwo_unit.section. */
741 struct dwarf2_section_info info_or_types;
744 /* Similar to virtual_v1_dwo_sections, but for DWP version 2.
745 In version 2, the sections of the DWO files are concatenated together
746 and stored in one section of that name. Thus each ELF section contains
747 several "virtual" sections. */
749 struct virtual_v2_dwo_sections
751 bfd_size_type abbrev_offset;
752 bfd_size_type abbrev_size;
754 bfd_size_type line_offset;
755 bfd_size_type line_size;
757 bfd_size_type loc_offset;
758 bfd_size_type loc_size;
760 bfd_size_type macinfo_offset;
761 bfd_size_type macinfo_size;
763 bfd_size_type macro_offset;
764 bfd_size_type macro_size;
766 bfd_size_type str_offsets_offset;
767 bfd_size_type str_offsets_size;
769 /* Each DWP hash table entry records one CU or one TU.
770 That is recorded here, and copied to dwo_unit.section. */
771 bfd_size_type info_or_types_offset;
772 bfd_size_type info_or_types_size;
775 /* Contents of DWP hash tables. */
777 struct dwp_hash_table
779 uint32_t version, nr_columns;
780 uint32_t nr_units, nr_slots;
781 const gdb_byte *hash_table, *unit_table;
786 const gdb_byte *indices;
790 /* This is indexed by column number and gives the id of the section
792 #define MAX_NR_V2_DWO_SECTIONS \
793 (1 /* .debug_info or .debug_types */ \
794 + 1 /* .debug_abbrev */ \
795 + 1 /* .debug_line */ \
796 + 1 /* .debug_loc */ \
797 + 1 /* .debug_str_offsets */ \
798 + 1 /* .debug_macro or .debug_macinfo */)
799 int section_ids[MAX_NR_V2_DWO_SECTIONS];
800 const gdb_byte *offsets;
801 const gdb_byte *sizes;
806 /* Data for one DWP file. */
810 /* Name of the file. */
813 /* File format version. */
819 /* Section info for this file. */
820 struct dwp_sections sections;
822 /* Table of CUs in the file. */
823 const struct dwp_hash_table *cus;
825 /* Table of TUs in the file. */
826 const struct dwp_hash_table *tus;
828 /* Tables of loaded CUs/TUs. Each entry is a struct dwo_unit *. */
832 /* Table to map ELF section numbers to their sections.
833 This is only needed for the DWP V1 file format. */
834 unsigned int num_sections;
835 asection **elf_sections;
838 /* This represents a '.dwz' file. */
842 /* A dwz file can only contain a few sections. */
843 struct dwarf2_section_info abbrev;
844 struct dwarf2_section_info info;
845 struct dwarf2_section_info str;
846 struct dwarf2_section_info line;
847 struct dwarf2_section_info macro;
848 struct dwarf2_section_info gdb_index;
849 struct dwarf2_section_info debug_names;
855 /* Struct used to pass misc. parameters to read_die_and_children, et
856 al. which are used for both .debug_info and .debug_types dies.
857 All parameters here are unchanging for the life of the call. This
858 struct exists to abstract away the constant parameters of die reading. */
860 struct die_reader_specs
862 /* The bfd of die_section. */
865 /* The CU of the DIE we are parsing. */
866 struct dwarf2_cu *cu;
868 /* Non-NULL if reading a DWO file (including one packaged into a DWP). */
869 struct dwo_file *dwo_file;
871 /* The section the die comes from.
872 This is either .debug_info or .debug_types, or the .dwo variants. */
873 struct dwarf2_section_info *die_section;
875 /* die_section->buffer. */
876 const gdb_byte *buffer;
878 /* The end of the buffer. */
879 const gdb_byte *buffer_end;
881 /* The value of the DW_AT_comp_dir attribute. */
882 const char *comp_dir;
884 /* The abbreviation table to use when reading the DIEs. */
885 struct abbrev_table *abbrev_table;
888 /* Type of function passed to init_cutu_and_read_dies, et.al. */
889 typedef void (die_reader_func_ftype) (const struct die_reader_specs *reader,
890 const gdb_byte *info_ptr,
891 struct die_info *comp_unit_die,
895 /* A 1-based directory index. This is a strong typedef to prevent
896 accidentally using a directory index as a 0-based index into an
898 enum class dir_index : unsigned int {};
900 /* Likewise, a 1-based file name index. */
901 enum class file_name_index : unsigned int {};
905 file_entry () = default;
907 file_entry (const char *name_, dir_index d_index_,
908 unsigned int mod_time_, unsigned int length_)
911 mod_time (mod_time_),
915 /* Return the include directory at D_INDEX stored in LH. Returns
916 NULL if D_INDEX is out of bounds. */
917 const char *include_dir (const line_header *lh) const;
919 /* The file name. Note this is an observing pointer. The memory is
920 owned by debug_line_buffer. */
923 /* The directory index (1-based). */
924 dir_index d_index {};
926 unsigned int mod_time {};
928 unsigned int length {};
930 /* True if referenced by the Line Number Program. */
933 /* The associated symbol table, if any. */
934 struct symtab *symtab {};
937 /* The line number information for a compilation unit (found in the
938 .debug_line section) begins with a "statement program header",
939 which contains the following information. */
946 /* Add an entry to the include directory table. */
947 void add_include_dir (const char *include_dir);
949 /* Add an entry to the file name table. */
950 void add_file_name (const char *name, dir_index d_index,
951 unsigned int mod_time, unsigned int length);
953 /* Return the include dir at INDEX (1-based). Returns NULL if INDEX
955 const char *include_dir_at (dir_index index) const
957 /* Convert directory index number (1-based) to vector index
959 size_t vec_index = to_underlying (index) - 1;
961 if (vec_index >= include_dirs.size ())
963 return include_dirs[vec_index];
966 /* Return the file name at INDEX (1-based). Returns NULL if INDEX
968 file_entry *file_name_at (file_name_index index)
970 /* Convert file name index number (1-based) to vector index
972 size_t vec_index = to_underlying (index) - 1;
974 if (vec_index >= file_names.size ())
976 return &file_names[vec_index];
979 /* Const version of the above. */
980 const file_entry *file_name_at (unsigned int index) const
982 if (index >= file_names.size ())
984 return &file_names[index];
987 /* Offset of line number information in .debug_line section. */
988 sect_offset sect_off {};
990 /* OFFSET is for struct dwz_file associated with dwarf2_per_objfile. */
991 unsigned offset_in_dwz : 1; /* Can't initialize bitfields in-class. */
993 unsigned int total_length {};
994 unsigned short version {};
995 unsigned int header_length {};
996 unsigned char minimum_instruction_length {};
997 unsigned char maximum_ops_per_instruction {};
998 unsigned char default_is_stmt {};
1000 unsigned char line_range {};
1001 unsigned char opcode_base {};
1003 /* standard_opcode_lengths[i] is the number of operands for the
1004 standard opcode whose value is i. This means that
1005 standard_opcode_lengths[0] is unused, and the last meaningful
1006 element is standard_opcode_lengths[opcode_base - 1]. */
1007 std::unique_ptr<unsigned char[]> standard_opcode_lengths;
1009 /* The include_directories table. Note these are observing
1010 pointers. The memory is owned by debug_line_buffer. */
1011 std::vector<const char *> include_dirs;
1013 /* The file_names table. */
1014 std::vector<file_entry> file_names;
1016 /* The start and end of the statement program following this
1017 header. These point into dwarf2_per_objfile->line_buffer. */
1018 const gdb_byte *statement_program_start {}, *statement_program_end {};
1021 typedef std::unique_ptr<line_header> line_header_up;
1024 file_entry::include_dir (const line_header *lh) const
1026 return lh->include_dir_at (d_index);
1029 /* When we construct a partial symbol table entry we only
1030 need this much information. */
1031 struct partial_die_info : public allocate_on_obstack
1033 partial_die_info (sect_offset sect_off, struct abbrev_info *abbrev);
1035 /* Disable assign but still keep copy ctor, which is needed
1036 load_partial_dies. */
1037 partial_die_info& operator=(const partial_die_info& rhs) = delete;
1039 /* Adjust the partial die before generating a symbol for it. This
1040 function may set the is_external flag or change the DIE's
1042 void fixup (struct dwarf2_cu *cu);
1044 /* Read a minimal amount of information into the minimal die
1046 const gdb_byte *read (const struct die_reader_specs *reader,
1047 const struct abbrev_info &abbrev,
1048 const gdb_byte *info_ptr);
1050 /* Offset of this DIE. */
1051 const sect_offset sect_off;
1053 /* DWARF-2 tag for this DIE. */
1054 const ENUM_BITFIELD(dwarf_tag) tag : 16;
1056 /* Assorted flags describing the data found in this DIE. */
1057 const unsigned int has_children : 1;
1059 unsigned int is_external : 1;
1060 unsigned int is_declaration : 1;
1061 unsigned int has_type : 1;
1062 unsigned int has_specification : 1;
1063 unsigned int has_pc_info : 1;
1064 unsigned int may_be_inlined : 1;
1066 /* This DIE has been marked DW_AT_main_subprogram. */
1067 unsigned int main_subprogram : 1;
1069 /* Flag set if the SCOPE field of this structure has been
1071 unsigned int scope_set : 1;
1073 /* Flag set if the DIE has a byte_size attribute. */
1074 unsigned int has_byte_size : 1;
1076 /* Flag set if the DIE has a DW_AT_const_value attribute. */
1077 unsigned int has_const_value : 1;
1079 /* Flag set if any of the DIE's children are template arguments. */
1080 unsigned int has_template_arguments : 1;
1082 /* Flag set if fixup has been called on this die. */
1083 unsigned int fixup_called : 1;
1085 /* Flag set if DW_TAG_imported_unit uses DW_FORM_GNU_ref_alt. */
1086 unsigned int is_dwz : 1;
1088 /* Flag set if spec_offset uses DW_FORM_GNU_ref_alt. */
1089 unsigned int spec_is_dwz : 1;
1091 /* The name of this DIE. Normally the value of DW_AT_name, but
1092 sometimes a default name for unnamed DIEs. */
1093 const char *name = nullptr;
1095 /* The linkage name, if present. */
1096 const char *linkage_name = nullptr;
1098 /* The scope to prepend to our children. This is generally
1099 allocated on the comp_unit_obstack, so will disappear
1100 when this compilation unit leaves the cache. */
1101 const char *scope = nullptr;
1103 /* Some data associated with the partial DIE. The tag determines
1104 which field is live. */
1107 /* The location description associated with this DIE, if any. */
1108 struct dwarf_block *locdesc;
1109 /* The offset of an import, for DW_TAG_imported_unit. */
1110 sect_offset sect_off;
1113 /* If HAS_PC_INFO, the PC range associated with this DIE. */
1114 CORE_ADDR lowpc = 0;
1115 CORE_ADDR highpc = 0;
1117 /* Pointer into the info_buffer (or types_buffer) pointing at the target of
1118 DW_AT_sibling, if any. */
1119 /* NOTE: This member isn't strictly necessary, partial_die_info::read
1120 could return DW_AT_sibling values to its caller load_partial_dies. */
1121 const gdb_byte *sibling = nullptr;
1123 /* If HAS_SPECIFICATION, the offset of the DIE referred to by
1124 DW_AT_specification (or DW_AT_abstract_origin or
1125 DW_AT_extension). */
1126 sect_offset spec_offset {};
1128 /* Pointers to this DIE's parent, first child, and next sibling,
1130 struct partial_die_info *die_parent = nullptr;
1131 struct partial_die_info *die_child = nullptr;
1132 struct partial_die_info *die_sibling = nullptr;
1134 friend struct partial_die_info *
1135 dwarf2_cu::find_partial_die (sect_offset sect_off);
1138 /* Only need to do look up in dwarf2_cu::find_partial_die. */
1139 partial_die_info (sect_offset sect_off)
1140 : partial_die_info (sect_off, DW_TAG_padding, 0)
1144 partial_die_info (sect_offset sect_off_, enum dwarf_tag tag_,
1146 : sect_off (sect_off_), tag (tag_), has_children (has_children_)
1151 has_specification = 0;
1154 main_subprogram = 0;
1157 has_const_value = 0;
1158 has_template_arguments = 0;
1165 /* This data structure holds the information of an abbrev. */
1168 unsigned int number; /* number identifying abbrev */
1169 enum dwarf_tag tag; /* dwarf tag */
1170 unsigned short has_children; /* boolean */
1171 unsigned short num_attrs; /* number of attributes */
1172 struct attr_abbrev *attrs; /* an array of attribute descriptions */
1173 struct abbrev_info *next; /* next in chain */
1178 ENUM_BITFIELD(dwarf_attribute) name : 16;
1179 ENUM_BITFIELD(dwarf_form) form : 16;
1181 /* It is valid only if FORM is DW_FORM_implicit_const. */
1182 LONGEST implicit_const;
1185 /* Size of abbrev_table.abbrev_hash_table. */
1186 #define ABBREV_HASH_SIZE 121
1188 /* Top level data structure to contain an abbreviation table. */
1192 explicit abbrev_table (sect_offset off)
1196 XOBNEWVEC (&abbrev_obstack, struct abbrev_info *, ABBREV_HASH_SIZE);
1197 memset (m_abbrevs, 0, ABBREV_HASH_SIZE * sizeof (struct abbrev_info *));
1200 DISABLE_COPY_AND_ASSIGN (abbrev_table);
1202 /* Allocate space for a struct abbrev_info object in
1204 struct abbrev_info *alloc_abbrev ();
1206 /* Add an abbreviation to the table. */
1207 void add_abbrev (unsigned int abbrev_number, struct abbrev_info *abbrev);
1209 /* Look up an abbrev in the table.
1210 Returns NULL if the abbrev is not found. */
1212 struct abbrev_info *lookup_abbrev (unsigned int abbrev_number);
1215 /* Where the abbrev table came from.
1216 This is used as a sanity check when the table is used. */
1217 const sect_offset sect_off;
1219 /* Storage for the abbrev table. */
1220 auto_obstack abbrev_obstack;
1224 /* Hash table of abbrevs.
1225 This is an array of size ABBREV_HASH_SIZE allocated in abbrev_obstack.
1226 It could be statically allocated, but the previous code didn't so we
1228 struct abbrev_info **m_abbrevs;
1231 typedef std::unique_ptr<struct abbrev_table> abbrev_table_up;
1233 /* Attributes have a name and a value. */
1236 ENUM_BITFIELD(dwarf_attribute) name : 16;
1237 ENUM_BITFIELD(dwarf_form) form : 15;
1239 /* Has DW_STRING already been updated by dwarf2_canonicalize_name? This
1240 field should be in u.str (existing only for DW_STRING) but it is kept
1241 here for better struct attribute alignment. */
1242 unsigned int string_is_canonical : 1;
1247 struct dwarf_block *blk;
1256 /* This data structure holds a complete die structure. */
1259 /* DWARF-2 tag for this DIE. */
1260 ENUM_BITFIELD(dwarf_tag) tag : 16;
1262 /* Number of attributes */
1263 unsigned char num_attrs;
1265 /* True if we're presently building the full type name for the
1266 type derived from this DIE. */
1267 unsigned char building_fullname : 1;
1269 /* True if this die is in process. PR 16581. */
1270 unsigned char in_process : 1;
1273 unsigned int abbrev;
1275 /* Offset in .debug_info or .debug_types section. */
1276 sect_offset sect_off;
1278 /* The dies in a compilation unit form an n-ary tree. PARENT
1279 points to this die's parent; CHILD points to the first child of
1280 this node; and all the children of a given node are chained
1281 together via their SIBLING fields. */
1282 struct die_info *child; /* Its first child, if any. */
1283 struct die_info *sibling; /* Its next sibling, if any. */
1284 struct die_info *parent; /* Its parent, if any. */
1286 /* An array of attributes, with NUM_ATTRS elements. There may be
1287 zero, but it's not common and zero-sized arrays are not
1288 sufficiently portable C. */
1289 struct attribute attrs[1];
1292 /* Get at parts of an attribute structure. */
1294 #define DW_STRING(attr) ((attr)->u.str)
1295 #define DW_STRING_IS_CANONICAL(attr) ((attr)->string_is_canonical)
1296 #define DW_UNSND(attr) ((attr)->u.unsnd)
1297 #define DW_BLOCK(attr) ((attr)->u.blk)
1298 #define DW_SND(attr) ((attr)->u.snd)
1299 #define DW_ADDR(attr) ((attr)->u.addr)
1300 #define DW_SIGNATURE(attr) ((attr)->u.signature)
1302 /* Blocks are a bunch of untyped bytes. */
1307 /* Valid only if SIZE is not zero. */
1308 const gdb_byte *data;
1311 #ifndef ATTR_ALLOC_CHUNK
1312 #define ATTR_ALLOC_CHUNK 4
1315 /* Allocate fields for structs, unions and enums in this size. */
1316 #ifndef DW_FIELD_ALLOC_CHUNK
1317 #define DW_FIELD_ALLOC_CHUNK 4
1320 /* FIXME: We might want to set this from BFD via bfd_arch_bits_per_byte,
1321 but this would require a corresponding change in unpack_field_as_long
1323 static int bits_per_byte = 8;
1325 /* When reading a variant or variant part, we track a bit more
1326 information about the field, and store it in an object of this
1329 struct variant_field
1331 /* If we see a DW_TAG_variant, then this will be the discriminant
1333 ULONGEST discriminant_value;
1334 /* If we see a DW_TAG_variant, then this will be set if this is the
1336 bool default_branch;
1337 /* While reading a DW_TAG_variant_part, this will be set if this
1338 field is the discriminant. */
1339 bool is_discriminant;
1344 int accessibility = 0;
1346 /* Extra information to describe a variant or variant part. */
1347 struct variant_field variant {};
1348 struct field field {};
1353 const char *name = nullptr;
1354 std::vector<struct fn_field> fnfields;
1357 /* The routines that read and process dies for a C struct or C++ class
1358 pass lists of data member fields and lists of member function fields
1359 in an instance of a field_info structure, as defined below. */
1362 /* List of data member and baseclasses fields. */
1363 std::vector<struct nextfield> fields;
1364 std::vector<struct nextfield> baseclasses;
1366 /* Number of fields (including baseclasses). */
1369 /* Set if the accesibility of one of the fields is not public. */
1370 int non_public_fields = 0;
1372 /* Member function fieldlist array, contains name of possibly overloaded
1373 member function, number of overloaded member functions and a pointer
1374 to the head of the member function field chain. */
1375 std::vector<struct fnfieldlist> fnfieldlists;
1377 /* typedefs defined inside this class. TYPEDEF_FIELD_LIST contains head of
1378 a NULL terminated list of TYPEDEF_FIELD_LIST_COUNT elements. */
1379 std::vector<struct decl_field> typedef_field_list;
1381 /* Nested types defined by this class and the number of elements in this
1383 std::vector<struct decl_field> nested_types_list;
1386 /* One item on the queue of compilation units to read in full symbols
1388 struct dwarf2_queue_item
1390 struct dwarf2_per_cu_data *per_cu;
1391 enum language pretend_language;
1392 struct dwarf2_queue_item *next;
1395 /* The current queue. */
1396 static struct dwarf2_queue_item *dwarf2_queue, *dwarf2_queue_tail;
1398 /* Loaded secondary compilation units are kept in memory until they
1399 have not been referenced for the processing of this many
1400 compilation units. Set this to zero to disable caching. Cache
1401 sizes of up to at least twenty will improve startup time for
1402 typical inter-CU-reference binaries, at an obvious memory cost. */
1403 static int dwarf_max_cache_age = 5;
1405 show_dwarf_max_cache_age (struct ui_file *file, int from_tty,
1406 struct cmd_list_element *c, const char *value)
1408 fprintf_filtered (file, _("The upper bound on the age of cached "
1409 "DWARF compilation units is %s.\n"),
1413 /* local function prototypes */
1415 static const char *get_section_name (const struct dwarf2_section_info *);
1417 static const char *get_section_file_name (const struct dwarf2_section_info *);
1419 static void dwarf2_find_base_address (struct die_info *die,
1420 struct dwarf2_cu *cu);
1422 static struct partial_symtab *create_partial_symtab
1423 (struct dwarf2_per_cu_data *per_cu, const char *name);
1425 static void build_type_psymtabs_reader (const struct die_reader_specs *reader,
1426 const gdb_byte *info_ptr,
1427 struct die_info *type_unit_die,
1428 int has_children, void *data);
1430 static void dwarf2_build_psymtabs_hard
1431 (struct dwarf2_per_objfile *dwarf2_per_objfile);
1433 static void scan_partial_symbols (struct partial_die_info *,
1434 CORE_ADDR *, CORE_ADDR *,
1435 int, struct dwarf2_cu *);
1437 static void add_partial_symbol (struct partial_die_info *,
1438 struct dwarf2_cu *);
1440 static void add_partial_namespace (struct partial_die_info *pdi,
1441 CORE_ADDR *lowpc, CORE_ADDR *highpc,
1442 int set_addrmap, struct dwarf2_cu *cu);
1444 static void add_partial_module (struct partial_die_info *pdi, CORE_ADDR *lowpc,
1445 CORE_ADDR *highpc, int set_addrmap,
1446 struct dwarf2_cu *cu);
1448 static void add_partial_enumeration (struct partial_die_info *enum_pdi,
1449 struct dwarf2_cu *cu);
1451 static void add_partial_subprogram (struct partial_die_info *pdi,
1452 CORE_ADDR *lowpc, CORE_ADDR *highpc,
1453 int need_pc, struct dwarf2_cu *cu);
1455 static void dwarf2_read_symtab (struct partial_symtab *,
1458 static void psymtab_to_symtab_1 (struct partial_symtab *);
1460 static abbrev_table_up abbrev_table_read_table
1461 (struct dwarf2_per_objfile *dwarf2_per_objfile, struct dwarf2_section_info *,
1464 static unsigned int peek_abbrev_code (bfd *, const gdb_byte *);
1466 static struct partial_die_info *load_partial_dies
1467 (const struct die_reader_specs *, const gdb_byte *, int);
1469 static struct partial_die_info *find_partial_die (sect_offset, int,
1470 struct dwarf2_cu *);
1472 static const gdb_byte *read_attribute (const struct die_reader_specs *,
1473 struct attribute *, struct attr_abbrev *,
1476 static unsigned int read_1_byte (bfd *, const gdb_byte *);
1478 static int read_1_signed_byte (bfd *, const gdb_byte *);
1480 static unsigned int read_2_bytes (bfd *, const gdb_byte *);
1482 static unsigned int read_4_bytes (bfd *, const gdb_byte *);
1484 static ULONGEST read_8_bytes (bfd *, const gdb_byte *);
1486 static CORE_ADDR read_address (bfd *, const gdb_byte *ptr, struct dwarf2_cu *,
1489 static LONGEST read_initial_length (bfd *, const gdb_byte *, unsigned int *);
1491 static LONGEST read_checked_initial_length_and_offset
1492 (bfd *, const gdb_byte *, const struct comp_unit_head *,
1493 unsigned int *, unsigned int *);
1495 static LONGEST read_offset (bfd *, const gdb_byte *,
1496 const struct comp_unit_head *,
1499 static LONGEST read_offset_1 (bfd *, const gdb_byte *, unsigned int);
1501 static sect_offset read_abbrev_offset
1502 (struct dwarf2_per_objfile *dwarf2_per_objfile,
1503 struct dwarf2_section_info *, sect_offset);
1505 static const gdb_byte *read_n_bytes (bfd *, const gdb_byte *, unsigned int);
1507 static const char *read_direct_string (bfd *, const gdb_byte *, unsigned int *);
1509 static const char *read_indirect_string
1510 (struct dwarf2_per_objfile *dwarf2_per_objfile, bfd *, const gdb_byte *,
1511 const struct comp_unit_head *, unsigned int *);
1513 static const char *read_indirect_line_string
1514 (struct dwarf2_per_objfile *dwarf2_per_objfile, bfd *, const gdb_byte *,
1515 const struct comp_unit_head *, unsigned int *);
1517 static const char *read_indirect_string_at_offset
1518 (struct dwarf2_per_objfile *dwarf2_per_objfile, bfd *abfd,
1519 LONGEST str_offset);
1521 static const char *read_indirect_string_from_dwz
1522 (struct objfile *objfile, struct dwz_file *, LONGEST);
1524 static LONGEST read_signed_leb128 (bfd *, const gdb_byte *, unsigned int *);
1526 static CORE_ADDR read_addr_index_from_leb128 (struct dwarf2_cu *,
1530 static const char *read_str_index (const struct die_reader_specs *reader,
1531 ULONGEST str_index);
1533 static void set_cu_language (unsigned int, struct dwarf2_cu *);
1535 static struct attribute *dwarf2_attr (struct die_info *, unsigned int,
1536 struct dwarf2_cu *);
1538 static struct attribute *dwarf2_attr_no_follow (struct die_info *,
1541 static const char *dwarf2_string_attr (struct die_info *die, unsigned int name,
1542 struct dwarf2_cu *cu);
1544 static int dwarf2_flag_true_p (struct die_info *die, unsigned name,
1545 struct dwarf2_cu *cu);
1547 static int die_is_declaration (struct die_info *, struct dwarf2_cu *cu);
1549 static struct die_info *die_specification (struct die_info *die,
1550 struct dwarf2_cu **);
1552 static line_header_up dwarf_decode_line_header (sect_offset sect_off,
1553 struct dwarf2_cu *cu);
1555 static void dwarf_decode_lines (struct line_header *, const char *,
1556 struct dwarf2_cu *, struct partial_symtab *,
1557 CORE_ADDR, int decode_mapping);
1559 static void dwarf2_start_subfile (const char *, const char *);
1561 static struct compunit_symtab *dwarf2_start_symtab (struct dwarf2_cu *,
1562 const char *, const char *,
1565 static struct symbol *new_symbol (struct die_info *, struct type *,
1566 struct dwarf2_cu *, struct symbol * = NULL);
1568 static void dwarf2_const_value (const struct attribute *, struct symbol *,
1569 struct dwarf2_cu *);
1571 static void dwarf2_const_value_attr (const struct attribute *attr,
1574 struct obstack *obstack,
1575 struct dwarf2_cu *cu, LONGEST *value,
1576 const gdb_byte **bytes,
1577 struct dwarf2_locexpr_baton **baton);
1579 static struct type *die_type (struct die_info *, struct dwarf2_cu *);
1581 static int need_gnat_info (struct dwarf2_cu *);
1583 static struct type *die_descriptive_type (struct die_info *,
1584 struct dwarf2_cu *);
1586 static void set_descriptive_type (struct type *, struct die_info *,
1587 struct dwarf2_cu *);
1589 static struct type *die_containing_type (struct die_info *,
1590 struct dwarf2_cu *);
1592 static struct type *lookup_die_type (struct die_info *, const struct attribute *,
1593 struct dwarf2_cu *);
1595 static struct type *read_type_die (struct die_info *, struct dwarf2_cu *);
1597 static struct type *read_type_die_1 (struct die_info *, struct dwarf2_cu *);
1599 static const char *determine_prefix (struct die_info *die, struct dwarf2_cu *);
1601 static char *typename_concat (struct obstack *obs, const char *prefix,
1602 const char *suffix, int physname,
1603 struct dwarf2_cu *cu);
1605 static void read_file_scope (struct die_info *, struct dwarf2_cu *);
1607 static void read_type_unit_scope (struct die_info *, struct dwarf2_cu *);
1609 static void read_func_scope (struct die_info *, struct dwarf2_cu *);
1611 static void read_lexical_block_scope (struct die_info *, struct dwarf2_cu *);
1613 static void read_call_site_scope (struct die_info *die, struct dwarf2_cu *cu);
1615 static void read_variable (struct die_info *die, struct dwarf2_cu *cu);
1617 static int dwarf2_ranges_read (unsigned, CORE_ADDR *, CORE_ADDR *,
1618 struct dwarf2_cu *, struct partial_symtab *);
1620 /* How dwarf2_get_pc_bounds constructed its *LOWPC and *HIGHPC return
1621 values. Keep the items ordered with increasing constraints compliance. */
1624 /* No attribute DW_AT_low_pc, DW_AT_high_pc or DW_AT_ranges was found. */
1625 PC_BOUNDS_NOT_PRESENT,
1627 /* Some of the attributes DW_AT_low_pc, DW_AT_high_pc or DW_AT_ranges
1628 were present but they do not form a valid range of PC addresses. */
1631 /* Discontiguous range was found - that is DW_AT_ranges was found. */
1634 /* Contiguous range was found - DW_AT_low_pc and DW_AT_high_pc were found. */
1638 static enum pc_bounds_kind dwarf2_get_pc_bounds (struct die_info *,
1639 CORE_ADDR *, CORE_ADDR *,
1641 struct partial_symtab *);
1643 static void get_scope_pc_bounds (struct die_info *,
1644 CORE_ADDR *, CORE_ADDR *,
1645 struct dwarf2_cu *);
1647 static void dwarf2_record_block_ranges (struct die_info *, struct block *,
1648 CORE_ADDR, struct dwarf2_cu *);
1650 static void dwarf2_add_field (struct field_info *, struct die_info *,
1651 struct dwarf2_cu *);
1653 static void dwarf2_attach_fields_to_type (struct field_info *,
1654 struct type *, struct dwarf2_cu *);
1656 static void dwarf2_add_member_fn (struct field_info *,
1657 struct die_info *, struct type *,
1658 struct dwarf2_cu *);
1660 static void dwarf2_attach_fn_fields_to_type (struct field_info *,
1662 struct dwarf2_cu *);
1664 static void process_structure_scope (struct die_info *, struct dwarf2_cu *);
1666 static void read_common_block (struct die_info *, struct dwarf2_cu *);
1668 static void read_namespace (struct die_info *die, struct dwarf2_cu *);
1670 static void read_module (struct die_info *die, struct dwarf2_cu *cu);
1672 static struct using_direct **using_directives (enum language);
1674 static void read_import_statement (struct die_info *die, struct dwarf2_cu *);
1676 static int read_namespace_alias (struct die_info *die, struct dwarf2_cu *cu);
1678 static struct type *read_module_type (struct die_info *die,
1679 struct dwarf2_cu *cu);
1681 static const char *namespace_name (struct die_info *die,
1682 int *is_anonymous, struct dwarf2_cu *);
1684 static void process_enumeration_scope (struct die_info *, struct dwarf2_cu *);
1686 static CORE_ADDR decode_locdesc (struct dwarf_block *, struct dwarf2_cu *);
1688 static enum dwarf_array_dim_ordering read_array_order (struct die_info *,
1689 struct dwarf2_cu *);
1691 static struct die_info *read_die_and_siblings_1
1692 (const struct die_reader_specs *, const gdb_byte *, const gdb_byte **,
1695 static struct die_info *read_die_and_siblings (const struct die_reader_specs *,
1696 const gdb_byte *info_ptr,
1697 const gdb_byte **new_info_ptr,
1698 struct die_info *parent);
1700 static const gdb_byte *read_full_die_1 (const struct die_reader_specs *,
1701 struct die_info **, const gdb_byte *,
1704 static const gdb_byte *read_full_die (const struct die_reader_specs *,
1705 struct die_info **, const gdb_byte *,
1708 static void process_die (struct die_info *, struct dwarf2_cu *);
1710 static const char *dwarf2_canonicalize_name (const char *, struct dwarf2_cu *,
1713 static const char *dwarf2_name (struct die_info *die, struct dwarf2_cu *);
1715 static const char *dwarf2_full_name (const char *name,
1716 struct die_info *die,
1717 struct dwarf2_cu *cu);
1719 static const char *dwarf2_physname (const char *name, struct die_info *die,
1720 struct dwarf2_cu *cu);
1722 static struct die_info *dwarf2_extension (struct die_info *die,
1723 struct dwarf2_cu **);
1725 static const char *dwarf_tag_name (unsigned int);
1727 static const char *dwarf_attr_name (unsigned int);
1729 static const char *dwarf_form_name (unsigned int);
1731 static const char *dwarf_bool_name (unsigned int);
1733 static const char *dwarf_type_encoding_name (unsigned int);
1735 static struct die_info *sibling_die (struct die_info *);
1737 static void dump_die_shallow (struct ui_file *, int indent, struct die_info *);
1739 static void dump_die_for_error (struct die_info *);
1741 static void dump_die_1 (struct ui_file *, int level, int max_level,
1744 /*static*/ void dump_die (struct die_info *, int max_level);
1746 static void store_in_ref_table (struct die_info *,
1747 struct dwarf2_cu *);
1749 static sect_offset dwarf2_get_ref_die_offset (const struct attribute *);
1751 static LONGEST dwarf2_get_attr_constant_value (const struct attribute *, int);
1753 static struct die_info *follow_die_ref_or_sig (struct die_info *,
1754 const struct attribute *,
1755 struct dwarf2_cu **);
1757 static struct die_info *follow_die_ref (struct die_info *,
1758 const struct attribute *,
1759 struct dwarf2_cu **);
1761 static struct die_info *follow_die_sig (struct die_info *,
1762 const struct attribute *,
1763 struct dwarf2_cu **);
1765 static struct type *get_signatured_type (struct die_info *, ULONGEST,
1766 struct dwarf2_cu *);
1768 static struct type *get_DW_AT_signature_type (struct die_info *,
1769 const struct attribute *,
1770 struct dwarf2_cu *);
1772 static void load_full_type_unit (struct dwarf2_per_cu_data *per_cu);
1774 static void read_signatured_type (struct signatured_type *);
1776 static int attr_to_dynamic_prop (const struct attribute *attr,
1777 struct die_info *die, struct dwarf2_cu *cu,
1778 struct dynamic_prop *prop);
1780 /* memory allocation interface */
1782 static struct dwarf_block *dwarf_alloc_block (struct dwarf2_cu *);
1784 static struct die_info *dwarf_alloc_die (struct dwarf2_cu *, int);
1786 static void dwarf_decode_macros (struct dwarf2_cu *, unsigned int, int);
1788 static int attr_form_is_block (const struct attribute *);
1790 static int attr_form_is_section_offset (const struct attribute *);
1792 static int attr_form_is_constant (const struct attribute *);
1794 static int attr_form_is_ref (const struct attribute *);
1796 static void fill_in_loclist_baton (struct dwarf2_cu *cu,
1797 struct dwarf2_loclist_baton *baton,
1798 const struct attribute *attr);
1800 static void dwarf2_symbol_mark_computed (const struct attribute *attr,
1802 struct dwarf2_cu *cu,
1805 static const gdb_byte *skip_one_die (const struct die_reader_specs *reader,
1806 const gdb_byte *info_ptr,
1807 struct abbrev_info *abbrev);
1809 static hashval_t partial_die_hash (const void *item);
1811 static int partial_die_eq (const void *item_lhs, const void *item_rhs);
1813 static struct dwarf2_per_cu_data *dwarf2_find_containing_comp_unit
1814 (sect_offset sect_off, unsigned int offset_in_dwz,
1815 struct dwarf2_per_objfile *dwarf2_per_objfile);
1817 static void prepare_one_comp_unit (struct dwarf2_cu *cu,
1818 struct die_info *comp_unit_die,
1819 enum language pretend_language);
1821 static void age_cached_comp_units (struct dwarf2_per_objfile *dwarf2_per_objfile);
1823 static void free_one_cached_comp_unit (struct dwarf2_per_cu_data *);
1825 static struct type *set_die_type (struct die_info *, struct type *,
1826 struct dwarf2_cu *);
1828 static void create_all_comp_units (struct dwarf2_per_objfile *dwarf2_per_objfile);
1830 static int create_all_type_units (struct dwarf2_per_objfile *dwarf2_per_objfile);
1832 static void load_full_comp_unit (struct dwarf2_per_cu_data *, bool,
1835 static void process_full_comp_unit (struct dwarf2_per_cu_data *,
1838 static void process_full_type_unit (struct dwarf2_per_cu_data *,
1841 static void dwarf2_add_dependence (struct dwarf2_cu *,
1842 struct dwarf2_per_cu_data *);
1844 static void dwarf2_mark (struct dwarf2_cu *);
1846 static void dwarf2_clear_marks (struct dwarf2_per_cu_data *);
1848 static struct type *get_die_type_at_offset (sect_offset,
1849 struct dwarf2_per_cu_data *);
1851 static struct type *get_die_type (struct die_info *die, struct dwarf2_cu *cu);
1853 static void queue_comp_unit (struct dwarf2_per_cu_data *per_cu,
1854 enum language pretend_language);
1856 static void process_queue (struct dwarf2_per_objfile *dwarf2_per_objfile);
1858 /* Class, the destructor of which frees all allocated queue entries. This
1859 will only have work to do if an error was thrown while processing the
1860 dwarf. If no error was thrown then the queue entries should have all
1861 been processed, and freed, as we went along. */
1863 class dwarf2_queue_guard
1866 dwarf2_queue_guard () = default;
1868 /* Free any entries remaining on the queue. There should only be
1869 entries left if we hit an error while processing the dwarf. */
1870 ~dwarf2_queue_guard ()
1872 struct dwarf2_queue_item *item, *last;
1874 item = dwarf2_queue;
1877 /* Anything still marked queued is likely to be in an
1878 inconsistent state, so discard it. */
1879 if (item->per_cu->queued)
1881 if (item->per_cu->cu != NULL)
1882 free_one_cached_comp_unit (item->per_cu);
1883 item->per_cu->queued = 0;
1891 dwarf2_queue = dwarf2_queue_tail = NULL;
1895 /* The return type of find_file_and_directory. Note, the enclosed
1896 string pointers are only valid while this object is valid. */
1898 struct file_and_directory
1900 /* The filename. This is never NULL. */
1903 /* The compilation directory. NULL if not known. If we needed to
1904 compute a new string, this points to COMP_DIR_STORAGE, otherwise,
1905 points directly to the DW_AT_comp_dir string attribute owned by
1906 the obstack that owns the DIE. */
1907 const char *comp_dir;
1909 /* If we needed to build a new string for comp_dir, this is what
1910 owns the storage. */
1911 std::string comp_dir_storage;
1914 static file_and_directory find_file_and_directory (struct die_info *die,
1915 struct dwarf2_cu *cu);
1917 static char *file_full_name (int file, struct line_header *lh,
1918 const char *comp_dir);
1920 /* Expected enum dwarf_unit_type for read_comp_unit_head. */
1921 enum class rcuh_kind { COMPILE, TYPE };
1923 static const gdb_byte *read_and_check_comp_unit_head
1924 (struct dwarf2_per_objfile* dwarf2_per_objfile,
1925 struct comp_unit_head *header,
1926 struct dwarf2_section_info *section,
1927 struct dwarf2_section_info *abbrev_section, const gdb_byte *info_ptr,
1928 rcuh_kind section_kind);
1930 static void init_cutu_and_read_dies
1931 (struct dwarf2_per_cu_data *this_cu, struct abbrev_table *abbrev_table,
1932 int use_existing_cu, int keep, bool skip_partial,
1933 die_reader_func_ftype *die_reader_func, void *data);
1935 static void init_cutu_and_read_dies_simple
1936 (struct dwarf2_per_cu_data *this_cu,
1937 die_reader_func_ftype *die_reader_func, void *data);
1939 static htab_t allocate_signatured_type_table (struct objfile *objfile);
1941 static htab_t allocate_dwo_unit_table (struct objfile *objfile);
1943 static struct dwo_unit *lookup_dwo_unit_in_dwp
1944 (struct dwarf2_per_objfile *dwarf2_per_objfile,
1945 struct dwp_file *dwp_file, const char *comp_dir,
1946 ULONGEST signature, int is_debug_types);
1948 static struct dwp_file *get_dwp_file
1949 (struct dwarf2_per_objfile *dwarf2_per_objfile);
1951 static struct dwo_unit *lookup_dwo_comp_unit
1952 (struct dwarf2_per_cu_data *, const char *, const char *, ULONGEST);
1954 static struct dwo_unit *lookup_dwo_type_unit
1955 (struct signatured_type *, const char *, const char *);
1957 static void queue_and_load_all_dwo_tus (struct dwarf2_per_cu_data *);
1959 static void free_dwo_file (struct dwo_file *);
1961 /* A unique_ptr helper to free a dwo_file. */
1963 struct dwo_file_deleter
1965 void operator() (struct dwo_file *df) const
1971 /* A unique pointer to a dwo_file. */
1973 typedef std::unique_ptr<struct dwo_file, dwo_file_deleter> dwo_file_up;
1975 static void process_cu_includes (struct dwarf2_per_objfile *dwarf2_per_objfile);
1977 static void check_producer (struct dwarf2_cu *cu);
1979 static void free_line_header_voidp (void *arg);
1981 /* Various complaints about symbol reading that don't abort the process. */
1984 dwarf2_statement_list_fits_in_line_number_section_complaint (void)
1986 complaint (&symfile_complaints,
1987 _("statement list doesn't fit in .debug_line section"));
1991 dwarf2_debug_line_missing_file_complaint (void)
1993 complaint (&symfile_complaints,
1994 _(".debug_line section has line data without a file"));
1998 dwarf2_debug_line_missing_end_sequence_complaint (void)
2000 complaint (&symfile_complaints,
2001 _(".debug_line section has line "
2002 "program sequence without an end"));
2006 dwarf2_complex_location_expr_complaint (void)
2008 complaint (&symfile_complaints, _("location expression too complex"));
2012 dwarf2_const_value_length_mismatch_complaint (const char *arg1, int arg2,
2015 complaint (&symfile_complaints,
2016 _("const value length mismatch for '%s', got %d, expected %d"),
2021 dwarf2_section_buffer_overflow_complaint (struct dwarf2_section_info *section)
2023 complaint (&symfile_complaints,
2024 _("debug info runs off end of %s section"
2026 get_section_name (section),
2027 get_section_file_name (section));
2031 dwarf2_macro_malformed_definition_complaint (const char *arg1)
2033 complaint (&symfile_complaints,
2034 _("macro debug info contains a "
2035 "malformed macro definition:\n`%s'"),
2040 dwarf2_invalid_attrib_class_complaint (const char *arg1, const char *arg2)
2042 complaint (&symfile_complaints,
2043 _("invalid attribute class or form for '%s' in '%s'"),
2047 /* Hash function for line_header_hash. */
2050 line_header_hash (const struct line_header *ofs)
2052 return to_underlying (ofs->sect_off) ^ ofs->offset_in_dwz;
2055 /* Hash function for htab_create_alloc_ex for line_header_hash. */
2058 line_header_hash_voidp (const void *item)
2060 const struct line_header *ofs = (const struct line_header *) item;
2062 return line_header_hash (ofs);
2065 /* Equality function for line_header_hash. */
2068 line_header_eq_voidp (const void *item_lhs, const void *item_rhs)
2070 const struct line_header *ofs_lhs = (const struct line_header *) item_lhs;
2071 const struct line_header *ofs_rhs = (const struct line_header *) item_rhs;
2073 return (ofs_lhs->sect_off == ofs_rhs->sect_off
2074 && ofs_lhs->offset_in_dwz == ofs_rhs->offset_in_dwz);
2079 /* Read the given attribute value as an address, taking the attribute's
2080 form into account. */
2083 attr_value_as_address (struct attribute *attr)
2087 if (attr->form != DW_FORM_addr && attr->form != DW_FORM_GNU_addr_index)
2089 /* Aside from a few clearly defined exceptions, attributes that
2090 contain an address must always be in DW_FORM_addr form.
2091 Unfortunately, some compilers happen to be violating this
2092 requirement by encoding addresses using other forms, such
2093 as DW_FORM_data4 for example. For those broken compilers,
2094 we try to do our best, without any guarantee of success,
2095 to interpret the address correctly. It would also be nice
2096 to generate a complaint, but that would require us to maintain
2097 a list of legitimate cases where a non-address form is allowed,
2098 as well as update callers to pass in at least the CU's DWARF
2099 version. This is more overhead than what we're willing to
2100 expand for a pretty rare case. */
2101 addr = DW_UNSND (attr);
2104 addr = DW_ADDR (attr);
2109 /* See declaration. */
2111 dwarf2_per_objfile::dwarf2_per_objfile (struct objfile *objfile_,
2112 const dwarf2_debug_sections *names)
2113 : objfile (objfile_)
2116 names = &dwarf2_elf_names;
2118 bfd *obfd = objfile->obfd;
2120 for (asection *sec = obfd->sections; sec != NULL; sec = sec->next)
2121 locate_sections (obfd, sec, *names);
2124 static void free_dwo_files (htab_t dwo_files, struct objfile *objfile);
2126 dwarf2_per_objfile::~dwarf2_per_objfile ()
2128 /* Cached DIE trees use xmalloc and the comp_unit_obstack. */
2129 free_cached_comp_units ();
2131 if (quick_file_names_table)
2132 htab_delete (quick_file_names_table);
2134 if (line_header_hash)
2135 htab_delete (line_header_hash);
2137 for (dwarf2_per_cu_data *per_cu : all_comp_units)
2138 VEC_free (dwarf2_per_cu_ptr, per_cu->imported_symtabs);
2140 for (signatured_type *sig_type : all_type_units)
2141 VEC_free (dwarf2_per_cu_ptr, sig_type->per_cu.imported_symtabs);
2143 VEC_free (dwarf2_section_info_def, types);
2145 if (dwo_files != NULL)
2146 free_dwo_files (dwo_files, objfile);
2147 if (dwp_file != NULL)
2148 gdb_bfd_unref (dwp_file->dbfd);
2150 if (dwz_file != NULL && dwz_file->dwz_bfd)
2151 gdb_bfd_unref (dwz_file->dwz_bfd);
2153 /* Everything else should be on the objfile obstack. */
2156 /* See declaration. */
2159 dwarf2_per_objfile::free_cached_comp_units ()
2161 dwarf2_per_cu_data *per_cu = read_in_chain;
2162 dwarf2_per_cu_data **last_chain = &read_in_chain;
2163 while (per_cu != NULL)
2165 dwarf2_per_cu_data *next_cu = per_cu->cu->read_in_chain;
2168 *last_chain = next_cu;
2173 /* A helper class that calls free_cached_comp_units on
2176 class free_cached_comp_units
2180 explicit free_cached_comp_units (dwarf2_per_objfile *per_objfile)
2181 : m_per_objfile (per_objfile)
2185 ~free_cached_comp_units ()
2187 m_per_objfile->free_cached_comp_units ();
2190 DISABLE_COPY_AND_ASSIGN (free_cached_comp_units);
2194 dwarf2_per_objfile *m_per_objfile;
2197 /* Try to locate the sections we need for DWARF 2 debugging
2198 information and return true if we have enough to do something.
2199 NAMES points to the dwarf2 section names, or is NULL if the standard
2200 ELF names are used. */
2203 dwarf2_has_info (struct objfile *objfile,
2204 const struct dwarf2_debug_sections *names)
2206 if (objfile->flags & OBJF_READNEVER)
2209 struct dwarf2_per_objfile *dwarf2_per_objfile
2210 = get_dwarf2_per_objfile (objfile);
2212 if (dwarf2_per_objfile == NULL)
2214 /* Initialize per-objfile state. */
2216 = new (&objfile->objfile_obstack) struct dwarf2_per_objfile (objfile,
2218 set_dwarf2_per_objfile (objfile, dwarf2_per_objfile);
2220 return (!dwarf2_per_objfile->info.is_virtual
2221 && dwarf2_per_objfile->info.s.section != NULL
2222 && !dwarf2_per_objfile->abbrev.is_virtual
2223 && dwarf2_per_objfile->abbrev.s.section != NULL);
2226 /* Return the containing section of virtual section SECTION. */
2228 static struct dwarf2_section_info *
2229 get_containing_section (const struct dwarf2_section_info *section)
2231 gdb_assert (section->is_virtual);
2232 return section->s.containing_section;
2235 /* Return the bfd owner of SECTION. */
2238 get_section_bfd_owner (const struct dwarf2_section_info *section)
2240 if (section->is_virtual)
2242 section = get_containing_section (section);
2243 gdb_assert (!section->is_virtual);
2245 return section->s.section->owner;
2248 /* Return the bfd section of SECTION.
2249 Returns NULL if the section is not present. */
2252 get_section_bfd_section (const struct dwarf2_section_info *section)
2254 if (section->is_virtual)
2256 section = get_containing_section (section);
2257 gdb_assert (!section->is_virtual);
2259 return section->s.section;
2262 /* Return the name of SECTION. */
2265 get_section_name (const struct dwarf2_section_info *section)
2267 asection *sectp = get_section_bfd_section (section);
2269 gdb_assert (sectp != NULL);
2270 return bfd_section_name (get_section_bfd_owner (section), sectp);
2273 /* Return the name of the file SECTION is in. */
2276 get_section_file_name (const struct dwarf2_section_info *section)
2278 bfd *abfd = get_section_bfd_owner (section);
2280 return bfd_get_filename (abfd);
2283 /* Return the id of SECTION.
2284 Returns 0 if SECTION doesn't exist. */
2287 get_section_id (const struct dwarf2_section_info *section)
2289 asection *sectp = get_section_bfd_section (section);
2296 /* Return the flags of SECTION.
2297 SECTION (or containing section if this is a virtual section) must exist. */
2300 get_section_flags (const struct dwarf2_section_info *section)
2302 asection *sectp = get_section_bfd_section (section);
2304 gdb_assert (sectp != NULL);
2305 return bfd_get_section_flags (sectp->owner, sectp);
2308 /* When loading sections, we look either for uncompressed section or for
2309 compressed section names. */
2312 section_is_p (const char *section_name,
2313 const struct dwarf2_section_names *names)
2315 if (names->normal != NULL
2316 && strcmp (section_name, names->normal) == 0)
2318 if (names->compressed != NULL
2319 && strcmp (section_name, names->compressed) == 0)
2324 /* See declaration. */
2327 dwarf2_per_objfile::locate_sections (bfd *abfd, asection *sectp,
2328 const dwarf2_debug_sections &names)
2330 flagword aflag = bfd_get_section_flags (abfd, sectp);
2332 if ((aflag & SEC_HAS_CONTENTS) == 0)
2335 else if (section_is_p (sectp->name, &names.info))
2337 this->info.s.section = sectp;
2338 this->info.size = bfd_get_section_size (sectp);
2340 else if (section_is_p (sectp->name, &names.abbrev))
2342 this->abbrev.s.section = sectp;
2343 this->abbrev.size = bfd_get_section_size (sectp);
2345 else if (section_is_p (sectp->name, &names.line))
2347 this->line.s.section = sectp;
2348 this->line.size = bfd_get_section_size (sectp);
2350 else if (section_is_p (sectp->name, &names.loc))
2352 this->loc.s.section = sectp;
2353 this->loc.size = bfd_get_section_size (sectp);
2355 else if (section_is_p (sectp->name, &names.loclists))
2357 this->loclists.s.section = sectp;
2358 this->loclists.size = bfd_get_section_size (sectp);
2360 else if (section_is_p (sectp->name, &names.macinfo))
2362 this->macinfo.s.section = sectp;
2363 this->macinfo.size = bfd_get_section_size (sectp);
2365 else if (section_is_p (sectp->name, &names.macro))
2367 this->macro.s.section = sectp;
2368 this->macro.size = bfd_get_section_size (sectp);
2370 else if (section_is_p (sectp->name, &names.str))
2372 this->str.s.section = sectp;
2373 this->str.size = bfd_get_section_size (sectp);
2375 else if (section_is_p (sectp->name, &names.line_str))
2377 this->line_str.s.section = sectp;
2378 this->line_str.size = bfd_get_section_size (sectp);
2380 else if (section_is_p (sectp->name, &names.addr))
2382 this->addr.s.section = sectp;
2383 this->addr.size = bfd_get_section_size (sectp);
2385 else if (section_is_p (sectp->name, &names.frame))
2387 this->frame.s.section = sectp;
2388 this->frame.size = bfd_get_section_size (sectp);
2390 else if (section_is_p (sectp->name, &names.eh_frame))
2392 this->eh_frame.s.section = sectp;
2393 this->eh_frame.size = bfd_get_section_size (sectp);
2395 else if (section_is_p (sectp->name, &names.ranges))
2397 this->ranges.s.section = sectp;
2398 this->ranges.size = bfd_get_section_size (sectp);
2400 else if (section_is_p (sectp->name, &names.rnglists))
2402 this->rnglists.s.section = sectp;
2403 this->rnglists.size = bfd_get_section_size (sectp);
2405 else if (section_is_p (sectp->name, &names.types))
2407 struct dwarf2_section_info type_section;
2409 memset (&type_section, 0, sizeof (type_section));
2410 type_section.s.section = sectp;
2411 type_section.size = bfd_get_section_size (sectp);
2413 VEC_safe_push (dwarf2_section_info_def, this->types,
2416 else if (section_is_p (sectp->name, &names.gdb_index))
2418 this->gdb_index.s.section = sectp;
2419 this->gdb_index.size = bfd_get_section_size (sectp);
2421 else if (section_is_p (sectp->name, &names.debug_names))
2423 this->debug_names.s.section = sectp;
2424 this->debug_names.size = bfd_get_section_size (sectp);
2426 else if (section_is_p (sectp->name, &names.debug_aranges))
2428 this->debug_aranges.s.section = sectp;
2429 this->debug_aranges.size = bfd_get_section_size (sectp);
2432 if ((bfd_get_section_flags (abfd, sectp) & (SEC_LOAD | SEC_ALLOC))
2433 && bfd_section_vma (abfd, sectp) == 0)
2434 this->has_section_at_zero = true;
2437 /* A helper function that decides whether a section is empty,
2441 dwarf2_section_empty_p (const struct dwarf2_section_info *section)
2443 if (section->is_virtual)
2444 return section->size == 0;
2445 return section->s.section == NULL || section->size == 0;
2448 /* See dwarf2read.h. */
2451 dwarf2_read_section (struct objfile *objfile, dwarf2_section_info *info)
2455 gdb_byte *buf, *retbuf;
2459 info->buffer = NULL;
2462 if (dwarf2_section_empty_p (info))
2465 sectp = get_section_bfd_section (info);
2467 /* If this is a virtual section we need to read in the real one first. */
2468 if (info->is_virtual)
2470 struct dwarf2_section_info *containing_section =
2471 get_containing_section (info);
2473 gdb_assert (sectp != NULL);
2474 if ((sectp->flags & SEC_RELOC) != 0)
2476 error (_("Dwarf Error: DWP format V2 with relocations is not"
2477 " supported in section %s [in module %s]"),
2478 get_section_name (info), get_section_file_name (info));
2480 dwarf2_read_section (objfile, containing_section);
2481 /* Other code should have already caught virtual sections that don't
2483 gdb_assert (info->virtual_offset + info->size
2484 <= containing_section->size);
2485 /* If the real section is empty or there was a problem reading the
2486 section we shouldn't get here. */
2487 gdb_assert (containing_section->buffer != NULL);
2488 info->buffer = containing_section->buffer + info->virtual_offset;
2492 /* If the section has relocations, we must read it ourselves.
2493 Otherwise we attach it to the BFD. */
2494 if ((sectp->flags & SEC_RELOC) == 0)
2496 info->buffer = gdb_bfd_map_section (sectp, &info->size);
2500 buf = (gdb_byte *) obstack_alloc (&objfile->objfile_obstack, info->size);
2503 /* When debugging .o files, we may need to apply relocations; see
2504 http://sourceware.org/ml/gdb-patches/2002-04/msg00136.html .
2505 We never compress sections in .o files, so we only need to
2506 try this when the section is not compressed. */
2507 retbuf = symfile_relocate_debug_section (objfile, sectp, buf);
2510 info->buffer = retbuf;
2514 abfd = get_section_bfd_owner (info);
2515 gdb_assert (abfd != NULL);
2517 if (bfd_seek (abfd, sectp->filepos, SEEK_SET) != 0
2518 || bfd_bread (buf, info->size, abfd) != info->size)
2520 error (_("Dwarf Error: Can't read DWARF data"
2521 " in section %s [in module %s]"),
2522 bfd_section_name (abfd, sectp), bfd_get_filename (abfd));
2526 /* A helper function that returns the size of a section in a safe way.
2527 If you are positive that the section has been read before using the
2528 size, then it is safe to refer to the dwarf2_section_info object's
2529 "size" field directly. In other cases, you must call this
2530 function, because for compressed sections the size field is not set
2531 correctly until the section has been read. */
2533 static bfd_size_type
2534 dwarf2_section_size (struct objfile *objfile,
2535 struct dwarf2_section_info *info)
2538 dwarf2_read_section (objfile, info);
2542 /* Fill in SECTP, BUFP and SIZEP with section info, given OBJFILE and
2546 dwarf2_get_section_info (struct objfile *objfile,
2547 enum dwarf2_section_enum sect,
2548 asection **sectp, const gdb_byte **bufp,
2549 bfd_size_type *sizep)
2551 struct dwarf2_per_objfile *data
2552 = (struct dwarf2_per_objfile *) objfile_data (objfile,
2553 dwarf2_objfile_data_key);
2554 struct dwarf2_section_info *info;
2556 /* We may see an objfile without any DWARF, in which case we just
2567 case DWARF2_DEBUG_FRAME:
2568 info = &data->frame;
2570 case DWARF2_EH_FRAME:
2571 info = &data->eh_frame;
2574 gdb_assert_not_reached ("unexpected section");
2577 dwarf2_read_section (objfile, info);
2579 *sectp = get_section_bfd_section (info);
2580 *bufp = info->buffer;
2581 *sizep = info->size;
2584 /* A helper function to find the sections for a .dwz file. */
2587 locate_dwz_sections (bfd *abfd, asection *sectp, void *arg)
2589 struct dwz_file *dwz_file = (struct dwz_file *) arg;
2591 /* Note that we only support the standard ELF names, because .dwz
2592 is ELF-only (at the time of writing). */
2593 if (section_is_p (sectp->name, &dwarf2_elf_names.abbrev))
2595 dwz_file->abbrev.s.section = sectp;
2596 dwz_file->abbrev.size = bfd_get_section_size (sectp);
2598 else if (section_is_p (sectp->name, &dwarf2_elf_names.info))
2600 dwz_file->info.s.section = sectp;
2601 dwz_file->info.size = bfd_get_section_size (sectp);
2603 else if (section_is_p (sectp->name, &dwarf2_elf_names.str))
2605 dwz_file->str.s.section = sectp;
2606 dwz_file->str.size = bfd_get_section_size (sectp);
2608 else if (section_is_p (sectp->name, &dwarf2_elf_names.line))
2610 dwz_file->line.s.section = sectp;
2611 dwz_file->line.size = bfd_get_section_size (sectp);
2613 else if (section_is_p (sectp->name, &dwarf2_elf_names.macro))
2615 dwz_file->macro.s.section = sectp;
2616 dwz_file->macro.size = bfd_get_section_size (sectp);
2618 else if (section_is_p (sectp->name, &dwarf2_elf_names.gdb_index))
2620 dwz_file->gdb_index.s.section = sectp;
2621 dwz_file->gdb_index.size = bfd_get_section_size (sectp);
2623 else if (section_is_p (sectp->name, &dwarf2_elf_names.debug_names))
2625 dwz_file->debug_names.s.section = sectp;
2626 dwz_file->debug_names.size = bfd_get_section_size (sectp);
2630 /* Open the separate '.dwz' debug file, if needed. Return NULL if
2631 there is no .gnu_debugaltlink section in the file. Error if there
2632 is such a section but the file cannot be found. */
2634 static struct dwz_file *
2635 dwarf2_get_dwz_file (struct dwarf2_per_objfile *dwarf2_per_objfile)
2637 const char *filename;
2638 struct dwz_file *result;
2639 bfd_size_type buildid_len_arg;
2643 if (dwarf2_per_objfile->dwz_file != NULL)
2644 return dwarf2_per_objfile->dwz_file;
2646 bfd_set_error (bfd_error_no_error);
2647 gdb::unique_xmalloc_ptr<char> data
2648 (bfd_get_alt_debug_link_info (dwarf2_per_objfile->objfile->obfd,
2649 &buildid_len_arg, &buildid));
2652 if (bfd_get_error () == bfd_error_no_error)
2654 error (_("could not read '.gnu_debugaltlink' section: %s"),
2655 bfd_errmsg (bfd_get_error ()));
2658 gdb::unique_xmalloc_ptr<bfd_byte> buildid_holder (buildid);
2660 buildid_len = (size_t) buildid_len_arg;
2662 filename = data.get ();
2664 std::string abs_storage;
2665 if (!IS_ABSOLUTE_PATH (filename))
2667 gdb::unique_xmalloc_ptr<char> abs
2668 = gdb_realpath (objfile_name (dwarf2_per_objfile->objfile));
2670 abs_storage = ldirname (abs.get ()) + SLASH_STRING + filename;
2671 filename = abs_storage.c_str ();
2674 /* First try the file name given in the section. If that doesn't
2675 work, try to use the build-id instead. */
2676 gdb_bfd_ref_ptr dwz_bfd (gdb_bfd_open (filename, gnutarget, -1));
2677 if (dwz_bfd != NULL)
2679 if (!build_id_verify (dwz_bfd.get (), buildid_len, buildid))
2683 if (dwz_bfd == NULL)
2684 dwz_bfd = build_id_to_debug_bfd (buildid_len, buildid);
2686 if (dwz_bfd == NULL)
2687 error (_("could not find '.gnu_debugaltlink' file for %s"),
2688 objfile_name (dwarf2_per_objfile->objfile));
2690 result = OBSTACK_ZALLOC (&dwarf2_per_objfile->objfile->objfile_obstack,
2692 result->dwz_bfd = dwz_bfd.release ();
2694 bfd_map_over_sections (result->dwz_bfd, locate_dwz_sections, result);
2696 gdb_bfd_record_inclusion (dwarf2_per_objfile->objfile->obfd, result->dwz_bfd);
2697 dwarf2_per_objfile->dwz_file = result;
2701 /* DWARF quick_symbols_functions support. */
2703 /* TUs can share .debug_line entries, and there can be a lot more TUs than
2704 unique line tables, so we maintain a separate table of all .debug_line
2705 derived entries to support the sharing.
2706 All the quick functions need is the list of file names. We discard the
2707 line_header when we're done and don't need to record it here. */
2708 struct quick_file_names
2710 /* The data used to construct the hash key. */
2711 struct stmt_list_hash hash;
2713 /* The number of entries in file_names, real_names. */
2714 unsigned int num_file_names;
2716 /* The file names from the line table, after being run through
2718 const char **file_names;
2720 /* The file names from the line table after being run through
2721 gdb_realpath. These are computed lazily. */
2722 const char **real_names;
2725 /* When using the index (and thus not using psymtabs), each CU has an
2726 object of this type. This is used to hold information needed by
2727 the various "quick" methods. */
2728 struct dwarf2_per_cu_quick_data
2730 /* The file table. This can be NULL if there was no file table
2731 or it's currently not read in.
2732 NOTE: This points into dwarf2_per_objfile->quick_file_names_table. */
2733 struct quick_file_names *file_names;
2735 /* The corresponding symbol table. This is NULL if symbols for this
2736 CU have not yet been read. */
2737 struct compunit_symtab *compunit_symtab;
2739 /* A temporary mark bit used when iterating over all CUs in
2740 expand_symtabs_matching. */
2741 unsigned int mark : 1;
2743 /* True if we've tried to read the file table and found there isn't one.
2744 There will be no point in trying to read it again next time. */
2745 unsigned int no_file_data : 1;
2748 /* Utility hash function for a stmt_list_hash. */
2751 hash_stmt_list_entry (const struct stmt_list_hash *stmt_list_hash)
2755 if (stmt_list_hash->dwo_unit != NULL)
2756 v += (uintptr_t) stmt_list_hash->dwo_unit->dwo_file;
2757 v += to_underlying (stmt_list_hash->line_sect_off);
2761 /* Utility equality function for a stmt_list_hash. */
2764 eq_stmt_list_entry (const struct stmt_list_hash *lhs,
2765 const struct stmt_list_hash *rhs)
2767 if ((lhs->dwo_unit != NULL) != (rhs->dwo_unit != NULL))
2769 if (lhs->dwo_unit != NULL
2770 && lhs->dwo_unit->dwo_file != rhs->dwo_unit->dwo_file)
2773 return lhs->line_sect_off == rhs->line_sect_off;
2776 /* Hash function for a quick_file_names. */
2779 hash_file_name_entry (const void *e)
2781 const struct quick_file_names *file_data
2782 = (const struct quick_file_names *) e;
2784 return hash_stmt_list_entry (&file_data->hash);
2787 /* Equality function for a quick_file_names. */
2790 eq_file_name_entry (const void *a, const void *b)
2792 const struct quick_file_names *ea = (const struct quick_file_names *) a;
2793 const struct quick_file_names *eb = (const struct quick_file_names *) b;
2795 return eq_stmt_list_entry (&ea->hash, &eb->hash);
2798 /* Delete function for a quick_file_names. */
2801 delete_file_name_entry (void *e)
2803 struct quick_file_names *file_data = (struct quick_file_names *) e;
2806 for (i = 0; i < file_data->num_file_names; ++i)
2808 xfree ((void*) file_data->file_names[i]);
2809 if (file_data->real_names)
2810 xfree ((void*) file_data->real_names[i]);
2813 /* The space for the struct itself lives on objfile_obstack,
2814 so we don't free it here. */
2817 /* Create a quick_file_names hash table. */
2820 create_quick_file_names_table (unsigned int nr_initial_entries)
2822 return htab_create_alloc (nr_initial_entries,
2823 hash_file_name_entry, eq_file_name_entry,
2824 delete_file_name_entry, xcalloc, xfree);
2827 /* Read in PER_CU->CU. This function is unrelated to symtabs, symtab would
2828 have to be created afterwards. You should call age_cached_comp_units after
2829 processing PER_CU->CU. dw2_setup must have been already called. */
2832 load_cu (struct dwarf2_per_cu_data *per_cu, bool skip_partial)
2834 if (per_cu->is_debug_types)
2835 load_full_type_unit (per_cu);
2837 load_full_comp_unit (per_cu, skip_partial, language_minimal);
2839 if (per_cu->cu == NULL)
2840 return; /* Dummy CU. */
2842 dwarf2_find_base_address (per_cu->cu->dies, per_cu->cu);
2845 /* Read in the symbols for PER_CU. */
2848 dw2_do_instantiate_symtab (struct dwarf2_per_cu_data *per_cu, bool skip_partial)
2850 struct dwarf2_per_objfile *dwarf2_per_objfile = per_cu->dwarf2_per_objfile;
2852 /* Skip type_unit_groups, reading the type units they contain
2853 is handled elsewhere. */
2854 if (IS_TYPE_UNIT_GROUP (per_cu))
2857 /* The destructor of dwarf2_queue_guard frees any entries left on
2858 the queue. After this point we're guaranteed to leave this function
2859 with the dwarf queue empty. */
2860 dwarf2_queue_guard q_guard;
2862 if (dwarf2_per_objfile->using_index
2863 ? per_cu->v.quick->compunit_symtab == NULL
2864 : (per_cu->v.psymtab == NULL || !per_cu->v.psymtab->readin))
2866 queue_comp_unit (per_cu, language_minimal);
2867 load_cu (per_cu, skip_partial);
2869 /* If we just loaded a CU from a DWO, and we're working with an index
2870 that may badly handle TUs, load all the TUs in that DWO as well.
2871 http://sourceware.org/bugzilla/show_bug.cgi?id=15021 */
2872 if (!per_cu->is_debug_types
2873 && per_cu->cu != NULL
2874 && per_cu->cu->dwo_unit != NULL
2875 && dwarf2_per_objfile->index_table != NULL
2876 && dwarf2_per_objfile->index_table->version <= 7
2877 /* DWP files aren't supported yet. */
2878 && get_dwp_file (dwarf2_per_objfile) == NULL)
2879 queue_and_load_all_dwo_tus (per_cu);
2882 process_queue (dwarf2_per_objfile);
2884 /* Age the cache, releasing compilation units that have not
2885 been used recently. */
2886 age_cached_comp_units (dwarf2_per_objfile);
2889 /* Ensure that the symbols for PER_CU have been read in. OBJFILE is
2890 the objfile from which this CU came. Returns the resulting symbol
2893 static struct compunit_symtab *
2894 dw2_instantiate_symtab (struct dwarf2_per_cu_data *per_cu, bool skip_partial)
2896 struct dwarf2_per_objfile *dwarf2_per_objfile = per_cu->dwarf2_per_objfile;
2898 gdb_assert (dwarf2_per_objfile->using_index);
2899 if (!per_cu->v.quick->compunit_symtab)
2901 free_cached_comp_units freer (dwarf2_per_objfile);
2902 scoped_restore decrementer = increment_reading_symtab ();
2903 dw2_do_instantiate_symtab (per_cu, skip_partial);
2904 process_cu_includes (dwarf2_per_objfile);
2907 return per_cu->v.quick->compunit_symtab;
2910 /* See declaration. */
2912 dwarf2_per_cu_data *
2913 dwarf2_per_objfile::get_cutu (int index)
2915 if (index >= this->all_comp_units.size ())
2917 index -= this->all_comp_units.size ();
2918 gdb_assert (index < this->all_type_units.size ());
2919 return &this->all_type_units[index]->per_cu;
2922 return this->all_comp_units[index];
2925 /* See declaration. */
2927 dwarf2_per_cu_data *
2928 dwarf2_per_objfile::get_cu (int index)
2930 gdb_assert (index >= 0 && index < this->all_comp_units.size ());
2932 return this->all_comp_units[index];
2935 /* See declaration. */
2938 dwarf2_per_objfile::get_tu (int index)
2940 gdb_assert (index >= 0 && index < this->all_type_units.size ());
2942 return this->all_type_units[index];
2945 /* Return a new dwarf2_per_cu_data allocated on OBJFILE's
2946 objfile_obstack, and constructed with the specified field
2949 static dwarf2_per_cu_data *
2950 create_cu_from_index_list (struct dwarf2_per_objfile *dwarf2_per_objfile,
2951 struct dwarf2_section_info *section,
2953 sect_offset sect_off, ULONGEST length)
2955 struct objfile *objfile = dwarf2_per_objfile->objfile;
2956 dwarf2_per_cu_data *the_cu
2957 = OBSTACK_ZALLOC (&objfile->objfile_obstack,
2958 struct dwarf2_per_cu_data);
2959 the_cu->sect_off = sect_off;
2960 the_cu->length = length;
2961 the_cu->dwarf2_per_objfile = dwarf2_per_objfile;
2962 the_cu->section = section;
2963 the_cu->v.quick = OBSTACK_ZALLOC (&objfile->objfile_obstack,
2964 struct dwarf2_per_cu_quick_data);
2965 the_cu->is_dwz = is_dwz;
2969 /* A helper for create_cus_from_index that handles a given list of
2973 create_cus_from_index_list (struct dwarf2_per_objfile *dwarf2_per_objfile,
2974 const gdb_byte *cu_list, offset_type n_elements,
2975 struct dwarf2_section_info *section,
2978 for (offset_type i = 0; i < n_elements; i += 2)
2980 gdb_static_assert (sizeof (ULONGEST) >= 8);
2982 sect_offset sect_off
2983 = (sect_offset) extract_unsigned_integer (cu_list, 8, BFD_ENDIAN_LITTLE);
2984 ULONGEST length = extract_unsigned_integer (cu_list + 8, 8, BFD_ENDIAN_LITTLE);
2987 dwarf2_per_cu_data *per_cu
2988 = create_cu_from_index_list (dwarf2_per_objfile, section, is_dwz,
2990 dwarf2_per_objfile->all_comp_units.push_back (per_cu);
2994 /* Read the CU list from the mapped index, and use it to create all
2995 the CU objects for this objfile. */
2998 create_cus_from_index (struct dwarf2_per_objfile *dwarf2_per_objfile,
2999 const gdb_byte *cu_list, offset_type cu_list_elements,
3000 const gdb_byte *dwz_list, offset_type dwz_elements)
3002 gdb_assert (dwarf2_per_objfile->all_comp_units.empty ());
3003 dwarf2_per_objfile->all_comp_units.reserve
3004 ((cu_list_elements + dwz_elements) / 2);
3006 create_cus_from_index_list (dwarf2_per_objfile, cu_list, cu_list_elements,
3007 &dwarf2_per_objfile->info, 0);
3009 if (dwz_elements == 0)
3012 dwz_file *dwz = dwarf2_get_dwz_file (dwarf2_per_objfile);
3013 create_cus_from_index_list (dwarf2_per_objfile, dwz_list, dwz_elements,
3017 /* Create the signatured type hash table from the index. */
3020 create_signatured_type_table_from_index
3021 (struct dwarf2_per_objfile *dwarf2_per_objfile,
3022 struct dwarf2_section_info *section,
3023 const gdb_byte *bytes,
3024 offset_type elements)
3026 struct objfile *objfile = dwarf2_per_objfile->objfile;
3028 gdb_assert (dwarf2_per_objfile->all_type_units.empty ());
3029 dwarf2_per_objfile->all_type_units.reserve (elements / 3);
3031 htab_t sig_types_hash = allocate_signatured_type_table (objfile);
3033 for (offset_type i = 0; i < elements; i += 3)
3035 struct signatured_type *sig_type;
3038 cu_offset type_offset_in_tu;
3040 gdb_static_assert (sizeof (ULONGEST) >= 8);
3041 sect_offset sect_off
3042 = (sect_offset) extract_unsigned_integer (bytes, 8, BFD_ENDIAN_LITTLE);
3044 = (cu_offset) extract_unsigned_integer (bytes + 8, 8,
3046 signature = extract_unsigned_integer (bytes + 16, 8, BFD_ENDIAN_LITTLE);
3049 sig_type = OBSTACK_ZALLOC (&objfile->objfile_obstack,
3050 struct signatured_type);
3051 sig_type->signature = signature;
3052 sig_type->type_offset_in_tu = type_offset_in_tu;
3053 sig_type->per_cu.is_debug_types = 1;
3054 sig_type->per_cu.section = section;
3055 sig_type->per_cu.sect_off = sect_off;
3056 sig_type->per_cu.dwarf2_per_objfile = dwarf2_per_objfile;
3057 sig_type->per_cu.v.quick
3058 = OBSTACK_ZALLOC (&objfile->objfile_obstack,
3059 struct dwarf2_per_cu_quick_data);
3061 slot = htab_find_slot (sig_types_hash, sig_type, INSERT);
3064 dwarf2_per_objfile->all_type_units.push_back (sig_type);
3067 dwarf2_per_objfile->signatured_types = sig_types_hash;
3070 /* Create the signatured type hash table from .debug_names. */
3073 create_signatured_type_table_from_debug_names
3074 (struct dwarf2_per_objfile *dwarf2_per_objfile,
3075 const mapped_debug_names &map,
3076 struct dwarf2_section_info *section,
3077 struct dwarf2_section_info *abbrev_section)
3079 struct objfile *objfile = dwarf2_per_objfile->objfile;
3081 dwarf2_read_section (objfile, section);
3082 dwarf2_read_section (objfile, abbrev_section);
3084 gdb_assert (dwarf2_per_objfile->all_type_units.empty ());
3085 dwarf2_per_objfile->all_type_units.reserve (map.tu_count);
3087 htab_t sig_types_hash = allocate_signatured_type_table (objfile);
3089 for (uint32_t i = 0; i < map.tu_count; ++i)
3091 struct signatured_type *sig_type;
3094 sect_offset sect_off
3095 = (sect_offset) (extract_unsigned_integer
3096 (map.tu_table_reordered + i * map.offset_size,
3098 map.dwarf5_byte_order));
3100 comp_unit_head cu_header;
3101 read_and_check_comp_unit_head (dwarf2_per_objfile, &cu_header, section,
3103 section->buffer + to_underlying (sect_off),
3106 sig_type = OBSTACK_ZALLOC (&objfile->objfile_obstack,
3107 struct signatured_type);
3108 sig_type->signature = cu_header.signature;
3109 sig_type->type_offset_in_tu = cu_header.type_cu_offset_in_tu;
3110 sig_type->per_cu.is_debug_types = 1;
3111 sig_type->per_cu.section = section;
3112 sig_type->per_cu.sect_off = sect_off;
3113 sig_type->per_cu.dwarf2_per_objfile = dwarf2_per_objfile;
3114 sig_type->per_cu.v.quick
3115 = OBSTACK_ZALLOC (&objfile->objfile_obstack,
3116 struct dwarf2_per_cu_quick_data);
3118 slot = htab_find_slot (sig_types_hash, sig_type, INSERT);
3121 dwarf2_per_objfile->all_type_units.push_back (sig_type);
3124 dwarf2_per_objfile->signatured_types = sig_types_hash;
3127 /* Read the address map data from the mapped index, and use it to
3128 populate the objfile's psymtabs_addrmap. */
3131 create_addrmap_from_index (struct dwarf2_per_objfile *dwarf2_per_objfile,
3132 struct mapped_index *index)
3134 struct objfile *objfile = dwarf2_per_objfile->objfile;
3135 struct gdbarch *gdbarch = get_objfile_arch (objfile);
3136 const gdb_byte *iter, *end;
3137 struct addrmap *mutable_map;
3140 auto_obstack temp_obstack;
3142 mutable_map = addrmap_create_mutable (&temp_obstack);
3144 iter = index->address_table.data ();
3145 end = iter + index->address_table.size ();
3147 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
3151 ULONGEST hi, lo, cu_index;
3152 lo = extract_unsigned_integer (iter, 8, BFD_ENDIAN_LITTLE);
3154 hi = extract_unsigned_integer (iter, 8, BFD_ENDIAN_LITTLE);
3156 cu_index = extract_unsigned_integer (iter, 4, BFD_ENDIAN_LITTLE);
3161 complaint (&symfile_complaints,
3162 _(".gdb_index address table has invalid range (%s - %s)"),
3163 hex_string (lo), hex_string (hi));
3167 if (cu_index >= dwarf2_per_objfile->all_comp_units.size ())
3169 complaint (&symfile_complaints,
3170 _(".gdb_index address table has invalid CU number %u"),
3171 (unsigned) cu_index);
3175 lo = gdbarch_adjust_dwarf2_addr (gdbarch, lo + baseaddr);
3176 hi = gdbarch_adjust_dwarf2_addr (gdbarch, hi + baseaddr);
3177 addrmap_set_empty (mutable_map, lo, hi - 1,
3178 dwarf2_per_objfile->get_cu (cu_index));
3181 objfile->psymtabs_addrmap = addrmap_create_fixed (mutable_map,
3182 &objfile->objfile_obstack);
3185 /* Read the address map data from DWARF-5 .debug_aranges, and use it to
3186 populate the objfile's psymtabs_addrmap. */
3189 create_addrmap_from_aranges (struct dwarf2_per_objfile *dwarf2_per_objfile,
3190 struct dwarf2_section_info *section)
3192 struct objfile *objfile = dwarf2_per_objfile->objfile;
3193 bfd *abfd = objfile->obfd;
3194 struct gdbarch *gdbarch = get_objfile_arch (objfile);
3195 const CORE_ADDR baseaddr = ANOFFSET (objfile->section_offsets,
3196 SECT_OFF_TEXT (objfile));
3198 auto_obstack temp_obstack;
3199 addrmap *mutable_map = addrmap_create_mutable (&temp_obstack);
3201 std::unordered_map<sect_offset,
3202 dwarf2_per_cu_data *,
3203 gdb::hash_enum<sect_offset>>
3204 debug_info_offset_to_per_cu;
3205 for (dwarf2_per_cu_data *per_cu : dwarf2_per_objfile->all_comp_units)
3207 const auto insertpair
3208 = debug_info_offset_to_per_cu.emplace (per_cu->sect_off, per_cu);
3209 if (!insertpair.second)
3211 warning (_("Section .debug_aranges in %s has duplicate "
3212 "debug_info_offset %s, ignoring .debug_aranges."),
3213 objfile_name (objfile), sect_offset_str (per_cu->sect_off));
3218 dwarf2_read_section (objfile, section);
3220 const bfd_endian dwarf5_byte_order = gdbarch_byte_order (gdbarch);
3222 const gdb_byte *addr = section->buffer;
3224 while (addr < section->buffer + section->size)
3226 const gdb_byte *const entry_addr = addr;
3227 unsigned int bytes_read;
3229 const LONGEST entry_length = read_initial_length (abfd, addr,
3233 const gdb_byte *const entry_end = addr + entry_length;
3234 const bool dwarf5_is_dwarf64 = bytes_read != 4;
3235 const uint8_t offset_size = dwarf5_is_dwarf64 ? 8 : 4;
3236 if (addr + entry_length > section->buffer + section->size)
3238 warning (_("Section .debug_aranges in %s entry at offset %zu "
3239 "length %s exceeds section length %s, "
3240 "ignoring .debug_aranges."),
3241 objfile_name (objfile), entry_addr - section->buffer,
3242 plongest (bytes_read + entry_length),
3243 pulongest (section->size));
3247 /* The version number. */
3248 const uint16_t version = read_2_bytes (abfd, addr);
3252 warning (_("Section .debug_aranges in %s entry at offset %zu "
3253 "has unsupported version %d, ignoring .debug_aranges."),
3254 objfile_name (objfile), entry_addr - section->buffer,
3259 const uint64_t debug_info_offset
3260 = extract_unsigned_integer (addr, offset_size, dwarf5_byte_order);
3261 addr += offset_size;
3262 const auto per_cu_it
3263 = debug_info_offset_to_per_cu.find (sect_offset (debug_info_offset));
3264 if (per_cu_it == debug_info_offset_to_per_cu.cend ())
3266 warning (_("Section .debug_aranges in %s entry at offset %zu "
3267 "debug_info_offset %s does not exists, "
3268 "ignoring .debug_aranges."),
3269 objfile_name (objfile), entry_addr - section->buffer,
3270 pulongest (debug_info_offset));
3273 dwarf2_per_cu_data *const per_cu = per_cu_it->second;
3275 const uint8_t address_size = *addr++;
3276 if (address_size < 1 || address_size > 8)
3278 warning (_("Section .debug_aranges in %s entry at offset %zu "
3279 "address_size %u is invalid, ignoring .debug_aranges."),
3280 objfile_name (objfile), entry_addr - section->buffer,
3285 const uint8_t segment_selector_size = *addr++;
3286 if (segment_selector_size != 0)
3288 warning (_("Section .debug_aranges in %s entry at offset %zu "
3289 "segment_selector_size %u is not supported, "
3290 "ignoring .debug_aranges."),
3291 objfile_name (objfile), entry_addr - section->buffer,
3292 segment_selector_size);
3296 /* Must pad to an alignment boundary that is twice the address
3297 size. It is undocumented by the DWARF standard but GCC does
3299 for (size_t padding = ((-(addr - section->buffer))
3300 & (2 * address_size - 1));
3301 padding > 0; padding--)
3304 warning (_("Section .debug_aranges in %s entry at offset %zu "
3305 "padding is not zero, ignoring .debug_aranges."),
3306 objfile_name (objfile), entry_addr - section->buffer);
3312 if (addr + 2 * address_size > entry_end)
3314 warning (_("Section .debug_aranges in %s entry at offset %zu "
3315 "address list is not properly terminated, "
3316 "ignoring .debug_aranges."),
3317 objfile_name (objfile), entry_addr - section->buffer);
3320 ULONGEST start = extract_unsigned_integer (addr, address_size,
3322 addr += address_size;
3323 ULONGEST length = extract_unsigned_integer (addr, address_size,
3325 addr += address_size;
3326 if (start == 0 && length == 0)
3328 if (start == 0 && !dwarf2_per_objfile->has_section_at_zero)
3330 /* Symbol was eliminated due to a COMDAT group. */
3333 ULONGEST end = start + length;
3334 start = gdbarch_adjust_dwarf2_addr (gdbarch, start + baseaddr);
3335 end = gdbarch_adjust_dwarf2_addr (gdbarch, end + baseaddr);
3336 addrmap_set_empty (mutable_map, start, end - 1, per_cu);
3340 objfile->psymtabs_addrmap = addrmap_create_fixed (mutable_map,
3341 &objfile->objfile_obstack);
3344 /* Find a slot in the mapped index INDEX for the object named NAME.
3345 If NAME is found, set *VEC_OUT to point to the CU vector in the
3346 constant pool and return true. If NAME cannot be found, return
3350 find_slot_in_mapped_hash (struct mapped_index *index, const char *name,
3351 offset_type **vec_out)
3354 offset_type slot, step;
3355 int (*cmp) (const char *, const char *);
3357 gdb::unique_xmalloc_ptr<char> without_params;
3358 if (current_language->la_language == language_cplus
3359 || current_language->la_language == language_fortran
3360 || current_language->la_language == language_d)
3362 /* NAME is already canonical. Drop any qualifiers as .gdb_index does
3365 if (strchr (name, '(') != NULL)
3367 without_params = cp_remove_params (name);
3369 if (without_params != NULL)
3370 name = without_params.get ();
3374 /* Index version 4 did not support case insensitive searches. But the
3375 indices for case insensitive languages are built in lowercase, therefore
3376 simulate our NAME being searched is also lowercased. */
3377 hash = mapped_index_string_hash ((index->version == 4
3378 && case_sensitivity == case_sensitive_off
3379 ? 5 : index->version),
3382 slot = hash & (index->symbol_table.size () - 1);
3383 step = ((hash * 17) & (index->symbol_table.size () - 1)) | 1;
3384 cmp = (case_sensitivity == case_sensitive_on ? strcmp : strcasecmp);
3390 const auto &bucket = index->symbol_table[slot];
3391 if (bucket.name == 0 && bucket.vec == 0)
3394 str = index->constant_pool + MAYBE_SWAP (bucket.name);
3395 if (!cmp (name, str))
3397 *vec_out = (offset_type *) (index->constant_pool
3398 + MAYBE_SWAP (bucket.vec));
3402 slot = (slot + step) & (index->symbol_table.size () - 1);
3406 /* A helper function that reads the .gdb_index from SECTION and fills
3407 in MAP. FILENAME is the name of the file containing the section;
3408 it is used for error reporting. DEPRECATED_OK is true if it is
3409 ok to use deprecated sections.
3411 CU_LIST, CU_LIST_ELEMENTS, TYPES_LIST, and TYPES_LIST_ELEMENTS are
3412 out parameters that are filled in with information about the CU and
3413 TU lists in the section.
3415 Returns 1 if all went well, 0 otherwise. */
3418 read_index_from_section (struct objfile *objfile,
3419 const char *filename,
3421 struct dwarf2_section_info *section,
3422 struct mapped_index *map,
3423 const gdb_byte **cu_list,
3424 offset_type *cu_list_elements,
3425 const gdb_byte **types_list,
3426 offset_type *types_list_elements)
3428 const gdb_byte *addr;
3429 offset_type version;
3430 offset_type *metadata;
3433 if (dwarf2_section_empty_p (section))
3436 /* Older elfutils strip versions could keep the section in the main
3437 executable while splitting it for the separate debug info file. */
3438 if ((get_section_flags (section) & SEC_HAS_CONTENTS) == 0)
3441 dwarf2_read_section (objfile, section);
3443 addr = section->buffer;
3444 /* Version check. */
3445 version = MAYBE_SWAP (*(offset_type *) addr);
3446 /* Versions earlier than 3 emitted every copy of a psymbol. This
3447 causes the index to behave very poorly for certain requests. Version 3
3448 contained incomplete addrmap. So, it seems better to just ignore such
3452 static int warning_printed = 0;
3453 if (!warning_printed)
3455 warning (_("Skipping obsolete .gdb_index section in %s."),
3457 warning_printed = 1;
3461 /* Index version 4 uses a different hash function than index version
3464 Versions earlier than 6 did not emit psymbols for inlined
3465 functions. Using these files will cause GDB not to be able to
3466 set breakpoints on inlined functions by name, so we ignore these
3467 indices unless the user has done
3468 "set use-deprecated-index-sections on". */
3469 if (version < 6 && !deprecated_ok)
3471 static int warning_printed = 0;
3472 if (!warning_printed)
3475 Skipping deprecated .gdb_index section in %s.\n\
3476 Do \"set use-deprecated-index-sections on\" before the file is read\n\
3477 to use the section anyway."),
3479 warning_printed = 1;
3483 /* Version 7 indices generated by gold refer to the CU for a symbol instead
3484 of the TU (for symbols coming from TUs),
3485 http://sourceware.org/bugzilla/show_bug.cgi?id=15021.
3486 Plus gold-generated indices can have duplicate entries for global symbols,
3487 http://sourceware.org/bugzilla/show_bug.cgi?id=15646.
3488 These are just performance bugs, and we can't distinguish gdb-generated
3489 indices from gold-generated ones, so issue no warning here. */
3491 /* Indexes with higher version than the one supported by GDB may be no
3492 longer backward compatible. */
3496 map->version = version;
3498 metadata = (offset_type *) (addr + sizeof (offset_type));
3501 *cu_list = addr + MAYBE_SWAP (metadata[i]);
3502 *cu_list_elements = ((MAYBE_SWAP (metadata[i + 1]) - MAYBE_SWAP (metadata[i]))
3506 *types_list = addr + MAYBE_SWAP (metadata[i]);
3507 *types_list_elements = ((MAYBE_SWAP (metadata[i + 1])
3508 - MAYBE_SWAP (metadata[i]))
3512 const gdb_byte *address_table = addr + MAYBE_SWAP (metadata[i]);
3513 const gdb_byte *address_table_end = addr + MAYBE_SWAP (metadata[i + 1]);
3515 = gdb::array_view<const gdb_byte> (address_table, address_table_end);
3518 const gdb_byte *symbol_table = addr + MAYBE_SWAP (metadata[i]);
3519 const gdb_byte *symbol_table_end = addr + MAYBE_SWAP (metadata[i + 1]);
3521 = gdb::array_view<mapped_index::symbol_table_slot>
3522 ((mapped_index::symbol_table_slot *) symbol_table,
3523 (mapped_index::symbol_table_slot *) symbol_table_end);
3526 map->constant_pool = (char *) (addr + MAYBE_SWAP (metadata[i]));
3531 /* Read .gdb_index. If everything went ok, initialize the "quick"
3532 elements of all the CUs and return 1. Otherwise, return 0. */
3535 dwarf2_read_index (struct dwarf2_per_objfile *dwarf2_per_objfile)
3537 const gdb_byte *cu_list, *types_list, *dwz_list = NULL;
3538 offset_type cu_list_elements, types_list_elements, dwz_list_elements = 0;
3539 struct dwz_file *dwz;
3540 struct objfile *objfile = dwarf2_per_objfile->objfile;
3542 std::unique_ptr<struct mapped_index> map (new struct mapped_index);
3543 if (!read_index_from_section (objfile, objfile_name (objfile),
3544 use_deprecated_index_sections,
3545 &dwarf2_per_objfile->gdb_index, map.get (),
3546 &cu_list, &cu_list_elements,
3547 &types_list, &types_list_elements))
3550 /* Don't use the index if it's empty. */
3551 if (map->symbol_table.empty ())
3554 /* If there is a .dwz file, read it so we can get its CU list as
3556 dwz = dwarf2_get_dwz_file (dwarf2_per_objfile);
3559 struct mapped_index dwz_map;
3560 const gdb_byte *dwz_types_ignore;
3561 offset_type dwz_types_elements_ignore;
3563 if (!read_index_from_section (objfile, bfd_get_filename (dwz->dwz_bfd),
3565 &dwz->gdb_index, &dwz_map,
3566 &dwz_list, &dwz_list_elements,
3568 &dwz_types_elements_ignore))
3570 warning (_("could not read '.gdb_index' section from %s; skipping"),
3571 bfd_get_filename (dwz->dwz_bfd));
3576 create_cus_from_index (dwarf2_per_objfile, cu_list, cu_list_elements,
3577 dwz_list, dwz_list_elements);
3579 if (types_list_elements)
3581 struct dwarf2_section_info *section;
3583 /* We can only handle a single .debug_types when we have an
3585 if (VEC_length (dwarf2_section_info_def, dwarf2_per_objfile->types) != 1)
3588 section = VEC_index (dwarf2_section_info_def,
3589 dwarf2_per_objfile->types, 0);
3591 create_signatured_type_table_from_index (dwarf2_per_objfile, section,
3592 types_list, types_list_elements);
3595 create_addrmap_from_index (dwarf2_per_objfile, map.get ());
3597 dwarf2_per_objfile->index_table = std::move (map);
3598 dwarf2_per_objfile->using_index = 1;
3599 dwarf2_per_objfile->quick_file_names_table =
3600 create_quick_file_names_table (dwarf2_per_objfile->all_comp_units.size ());
3605 /* die_reader_func for dw2_get_file_names. */
3608 dw2_get_file_names_reader (const struct die_reader_specs *reader,
3609 const gdb_byte *info_ptr,
3610 struct die_info *comp_unit_die,
3614 struct dwarf2_cu *cu = reader->cu;
3615 struct dwarf2_per_cu_data *this_cu = cu->per_cu;
3616 struct dwarf2_per_objfile *dwarf2_per_objfile
3617 = cu->per_cu->dwarf2_per_objfile;
3618 struct objfile *objfile = dwarf2_per_objfile->objfile;
3619 struct dwarf2_per_cu_data *lh_cu;
3620 struct attribute *attr;
3623 struct quick_file_names *qfn;
3625 gdb_assert (! this_cu->is_debug_types);
3627 /* Our callers never want to match partial units -- instead they
3628 will match the enclosing full CU. */
3629 if (comp_unit_die->tag == DW_TAG_partial_unit)
3631 this_cu->v.quick->no_file_data = 1;
3639 sect_offset line_offset {};
3641 attr = dwarf2_attr (comp_unit_die, DW_AT_stmt_list, cu);
3644 struct quick_file_names find_entry;
3646 line_offset = (sect_offset) DW_UNSND (attr);
3648 /* We may have already read in this line header (TU line header sharing).
3649 If we have we're done. */
3650 find_entry.hash.dwo_unit = cu->dwo_unit;
3651 find_entry.hash.line_sect_off = line_offset;
3652 slot = htab_find_slot (dwarf2_per_objfile->quick_file_names_table,
3653 &find_entry, INSERT);
3656 lh_cu->v.quick->file_names = (struct quick_file_names *) *slot;
3660 lh = dwarf_decode_line_header (line_offset, cu);
3664 lh_cu->v.quick->no_file_data = 1;
3668 qfn = XOBNEW (&objfile->objfile_obstack, struct quick_file_names);
3669 qfn->hash.dwo_unit = cu->dwo_unit;
3670 qfn->hash.line_sect_off = line_offset;
3671 gdb_assert (slot != NULL);
3674 file_and_directory fnd = find_file_and_directory (comp_unit_die, cu);
3676 qfn->num_file_names = lh->file_names.size ();
3678 XOBNEWVEC (&objfile->objfile_obstack, const char *, lh->file_names.size ());
3679 for (i = 0; i < lh->file_names.size (); ++i)
3680 qfn->file_names[i] = file_full_name (i + 1, lh.get (), fnd.comp_dir);
3681 qfn->real_names = NULL;
3683 lh_cu->v.quick->file_names = qfn;
3686 /* A helper for the "quick" functions which attempts to read the line
3687 table for THIS_CU. */
3689 static struct quick_file_names *
3690 dw2_get_file_names (struct dwarf2_per_cu_data *this_cu)
3692 /* This should never be called for TUs. */
3693 gdb_assert (! this_cu->is_debug_types);
3694 /* Nor type unit groups. */
3695 gdb_assert (! IS_TYPE_UNIT_GROUP (this_cu));
3697 if (this_cu->v.quick->file_names != NULL)
3698 return this_cu->v.quick->file_names;
3699 /* If we know there is no line data, no point in looking again. */
3700 if (this_cu->v.quick->no_file_data)
3703 init_cutu_and_read_dies_simple (this_cu, dw2_get_file_names_reader, NULL);
3705 if (this_cu->v.quick->no_file_data)
3707 return this_cu->v.quick->file_names;
3710 /* A helper for the "quick" functions which computes and caches the
3711 real path for a given file name from the line table. */
3714 dw2_get_real_path (struct objfile *objfile,
3715 struct quick_file_names *qfn, int index)
3717 if (qfn->real_names == NULL)
3718 qfn->real_names = OBSTACK_CALLOC (&objfile->objfile_obstack,
3719 qfn->num_file_names, const char *);
3721 if (qfn->real_names[index] == NULL)
3722 qfn->real_names[index] = gdb_realpath (qfn->file_names[index]).release ();
3724 return qfn->real_names[index];
3727 static struct symtab *
3728 dw2_find_last_source_symtab (struct objfile *objfile)
3730 struct dwarf2_per_objfile *dwarf2_per_objfile
3731 = get_dwarf2_per_objfile (objfile);
3732 dwarf2_per_cu_data *dwarf_cu = dwarf2_per_objfile->all_comp_units.back ();
3733 compunit_symtab *cust = dw2_instantiate_symtab (dwarf_cu, false);
3738 return compunit_primary_filetab (cust);
3741 /* Traversal function for dw2_forget_cached_source_info. */
3744 dw2_free_cached_file_names (void **slot, void *info)
3746 struct quick_file_names *file_data = (struct quick_file_names *) *slot;
3748 if (file_data->real_names)
3752 for (i = 0; i < file_data->num_file_names; ++i)
3754 xfree ((void*) file_data->real_names[i]);
3755 file_data->real_names[i] = NULL;
3763 dw2_forget_cached_source_info (struct objfile *objfile)
3765 struct dwarf2_per_objfile *dwarf2_per_objfile
3766 = get_dwarf2_per_objfile (objfile);
3768 htab_traverse_noresize (dwarf2_per_objfile->quick_file_names_table,
3769 dw2_free_cached_file_names, NULL);
3772 /* Helper function for dw2_map_symtabs_matching_filename that expands
3773 the symtabs and calls the iterator. */
3776 dw2_map_expand_apply (struct objfile *objfile,
3777 struct dwarf2_per_cu_data *per_cu,
3778 const char *name, const char *real_path,
3779 gdb::function_view<bool (symtab *)> callback)
3781 struct compunit_symtab *last_made = objfile->compunit_symtabs;
3783 /* Don't visit already-expanded CUs. */
3784 if (per_cu->v.quick->compunit_symtab)
3787 /* This may expand more than one symtab, and we want to iterate over
3789 dw2_instantiate_symtab (per_cu, false);
3791 return iterate_over_some_symtabs (name, real_path, objfile->compunit_symtabs,
3792 last_made, callback);
3795 /* Implementation of the map_symtabs_matching_filename method. */
3798 dw2_map_symtabs_matching_filename
3799 (struct objfile *objfile, const char *name, const char *real_path,
3800 gdb::function_view<bool (symtab *)> callback)
3802 const char *name_basename = lbasename (name);
3803 struct dwarf2_per_objfile *dwarf2_per_objfile
3804 = get_dwarf2_per_objfile (objfile);
3806 /* The rule is CUs specify all the files, including those used by
3807 any TU, so there's no need to scan TUs here. */
3809 for (dwarf2_per_cu_data *per_cu : dwarf2_per_objfile->all_comp_units)
3811 /* We only need to look at symtabs not already expanded. */
3812 if (per_cu->v.quick->compunit_symtab)
3815 quick_file_names *file_data = dw2_get_file_names (per_cu);
3816 if (file_data == NULL)
3819 for (int j = 0; j < file_data->num_file_names; ++j)
3821 const char *this_name = file_data->file_names[j];
3822 const char *this_real_name;
3824 if (compare_filenames_for_search (this_name, name))
3826 if (dw2_map_expand_apply (objfile, per_cu, name, real_path,
3832 /* Before we invoke realpath, which can get expensive when many
3833 files are involved, do a quick comparison of the basenames. */
3834 if (! basenames_may_differ
3835 && FILENAME_CMP (lbasename (this_name), name_basename) != 0)
3838 this_real_name = dw2_get_real_path (objfile, file_data, j);
3839 if (compare_filenames_for_search (this_real_name, name))
3841 if (dw2_map_expand_apply (objfile, per_cu, name, real_path,
3847 if (real_path != NULL)
3849 gdb_assert (IS_ABSOLUTE_PATH (real_path));
3850 gdb_assert (IS_ABSOLUTE_PATH (name));
3851 if (this_real_name != NULL
3852 && FILENAME_CMP (real_path, this_real_name) == 0)
3854 if (dw2_map_expand_apply (objfile, per_cu, name, real_path,
3866 /* Struct used to manage iterating over all CUs looking for a symbol. */
3868 struct dw2_symtab_iterator
3870 /* The dwarf2_per_objfile owning the CUs we are iterating on. */
3871 struct dwarf2_per_objfile *dwarf2_per_objfile;
3872 /* If non-zero, only look for symbols that match BLOCK_INDEX. */
3873 int want_specific_block;
3874 /* One of GLOBAL_BLOCK or STATIC_BLOCK.
3875 Unused if !WANT_SPECIFIC_BLOCK. */
3877 /* The kind of symbol we're looking for. */
3879 /* The list of CUs from the index entry of the symbol,
3880 or NULL if not found. */
3882 /* The next element in VEC to look at. */
3884 /* The number of elements in VEC, or zero if there is no match. */
3886 /* Have we seen a global version of the symbol?
3887 If so we can ignore all further global instances.
3888 This is to work around gold/15646, inefficient gold-generated
3893 /* Initialize the index symtab iterator ITER.
3894 If WANT_SPECIFIC_BLOCK is non-zero, only look for symbols
3895 in block BLOCK_INDEX. Otherwise BLOCK_INDEX is ignored. */
3898 dw2_symtab_iter_init (struct dw2_symtab_iterator *iter,
3899 struct dwarf2_per_objfile *dwarf2_per_objfile,
3900 int want_specific_block,
3905 iter->dwarf2_per_objfile = dwarf2_per_objfile;
3906 iter->want_specific_block = want_specific_block;
3907 iter->block_index = block_index;
3908 iter->domain = domain;
3910 iter->global_seen = 0;
3912 mapped_index *index = dwarf2_per_objfile->index_table.get ();
3914 /* index is NULL if OBJF_READNOW. */
3915 if (index != NULL && find_slot_in_mapped_hash (index, name, &iter->vec))
3916 iter->length = MAYBE_SWAP (*iter->vec);
3924 /* Return the next matching CU or NULL if there are no more. */
3926 static struct dwarf2_per_cu_data *
3927 dw2_symtab_iter_next (struct dw2_symtab_iterator *iter)
3929 struct dwarf2_per_objfile *dwarf2_per_objfile = iter->dwarf2_per_objfile;
3931 for ( ; iter->next < iter->length; ++iter->next)
3933 offset_type cu_index_and_attrs =
3934 MAYBE_SWAP (iter->vec[iter->next + 1]);
3935 offset_type cu_index = GDB_INDEX_CU_VALUE (cu_index_and_attrs);
3936 int want_static = iter->block_index != GLOBAL_BLOCK;
3937 /* This value is only valid for index versions >= 7. */
3938 int is_static = GDB_INDEX_SYMBOL_STATIC_VALUE (cu_index_and_attrs);
3939 gdb_index_symbol_kind symbol_kind =
3940 GDB_INDEX_SYMBOL_KIND_VALUE (cu_index_and_attrs);
3941 /* Only check the symbol attributes if they're present.
3942 Indices prior to version 7 don't record them,
3943 and indices >= 7 may elide them for certain symbols
3944 (gold does this). */
3946 (dwarf2_per_objfile->index_table->version >= 7
3947 && symbol_kind != GDB_INDEX_SYMBOL_KIND_NONE);
3949 /* Don't crash on bad data. */
3950 if (cu_index >= (dwarf2_per_objfile->all_comp_units.size ()
3951 + dwarf2_per_objfile->all_type_units.size ()))
3953 complaint (&symfile_complaints,
3954 _(".gdb_index entry has bad CU index"
3956 objfile_name (dwarf2_per_objfile->objfile));
3960 dwarf2_per_cu_data *per_cu = dwarf2_per_objfile->get_cutu (cu_index);
3962 /* Skip if already read in. */
3963 if (per_cu->v.quick->compunit_symtab)
3966 /* Check static vs global. */
3969 if (iter->want_specific_block
3970 && want_static != is_static)
3972 /* Work around gold/15646. */
3973 if (!is_static && iter->global_seen)
3976 iter->global_seen = 1;
3979 /* Only check the symbol's kind if it has one. */
3982 switch (iter->domain)
3985 if (symbol_kind != GDB_INDEX_SYMBOL_KIND_VARIABLE
3986 && symbol_kind != GDB_INDEX_SYMBOL_KIND_FUNCTION
3987 /* Some types are also in VAR_DOMAIN. */
3988 && symbol_kind != GDB_INDEX_SYMBOL_KIND_TYPE)
3992 if (symbol_kind != GDB_INDEX_SYMBOL_KIND_TYPE)
3996 if (symbol_kind != GDB_INDEX_SYMBOL_KIND_OTHER)
4011 static struct compunit_symtab *
4012 dw2_lookup_symbol (struct objfile *objfile, int block_index,
4013 const char *name, domain_enum domain)
4015 struct compunit_symtab *stab_best = NULL;
4016 struct dwarf2_per_objfile *dwarf2_per_objfile
4017 = get_dwarf2_per_objfile (objfile);
4019 lookup_name_info lookup_name (name, symbol_name_match_type::FULL);
4021 struct dw2_symtab_iterator iter;
4022 struct dwarf2_per_cu_data *per_cu;
4024 dw2_symtab_iter_init (&iter, dwarf2_per_objfile, 1, block_index, domain, name);
4026 while ((per_cu = dw2_symtab_iter_next (&iter)) != NULL)
4028 struct symbol *sym, *with_opaque = NULL;
4029 struct compunit_symtab *stab = dw2_instantiate_symtab (per_cu, false);
4030 const struct blockvector *bv = COMPUNIT_BLOCKVECTOR (stab);
4031 struct block *block = BLOCKVECTOR_BLOCK (bv, block_index);
4033 sym = block_find_symbol (block, name, domain,
4034 block_find_non_opaque_type_preferred,
4037 /* Some caution must be observed with overloaded functions
4038 and methods, since the index will not contain any overload
4039 information (but NAME might contain it). */
4042 && SYMBOL_MATCHES_SEARCH_NAME (sym, lookup_name))
4044 if (with_opaque != NULL
4045 && SYMBOL_MATCHES_SEARCH_NAME (with_opaque, lookup_name))
4048 /* Keep looking through other CUs. */
4055 dw2_print_stats (struct objfile *objfile)
4057 struct dwarf2_per_objfile *dwarf2_per_objfile
4058 = get_dwarf2_per_objfile (objfile);
4059 int total = (dwarf2_per_objfile->all_comp_units.size ()
4060 + dwarf2_per_objfile->all_type_units.size ());
4063 for (int i = 0; i < total; ++i)
4065 dwarf2_per_cu_data *per_cu = dwarf2_per_objfile->get_cutu (i);
4067 if (!per_cu->v.quick->compunit_symtab)
4070 printf_filtered (_(" Number of read CUs: %d\n"), total - count);
4071 printf_filtered (_(" Number of unread CUs: %d\n"), count);
4074 /* This dumps minimal information about the index.
4075 It is called via "mt print objfiles".
4076 One use is to verify .gdb_index has been loaded by the
4077 gdb.dwarf2/gdb-index.exp testcase. */
4080 dw2_dump (struct objfile *objfile)
4082 struct dwarf2_per_objfile *dwarf2_per_objfile
4083 = get_dwarf2_per_objfile (objfile);
4085 gdb_assert (dwarf2_per_objfile->using_index);
4086 printf_filtered (".gdb_index:");
4087 if (dwarf2_per_objfile->index_table != NULL)
4089 printf_filtered (" version %d\n",
4090 dwarf2_per_objfile->index_table->version);
4093 printf_filtered (" faked for \"readnow\"\n");
4094 printf_filtered ("\n");
4098 dw2_relocate (struct objfile *objfile,
4099 const struct section_offsets *new_offsets,
4100 const struct section_offsets *delta)
4102 /* There's nothing to relocate here. */
4106 dw2_expand_symtabs_for_function (struct objfile *objfile,
4107 const char *func_name)
4109 struct dwarf2_per_objfile *dwarf2_per_objfile
4110 = get_dwarf2_per_objfile (objfile);
4112 struct dw2_symtab_iterator iter;
4113 struct dwarf2_per_cu_data *per_cu;
4115 /* Note: It doesn't matter what we pass for block_index here. */
4116 dw2_symtab_iter_init (&iter, dwarf2_per_objfile, 0, GLOBAL_BLOCK, VAR_DOMAIN,
4119 while ((per_cu = dw2_symtab_iter_next (&iter)) != NULL)
4120 dw2_instantiate_symtab (per_cu, false);
4125 dw2_expand_all_symtabs (struct objfile *objfile)
4127 struct dwarf2_per_objfile *dwarf2_per_objfile
4128 = get_dwarf2_per_objfile (objfile);
4129 int total_units = (dwarf2_per_objfile->all_comp_units.size ()
4130 + dwarf2_per_objfile->all_type_units.size ());
4132 for (int i = 0; i < total_units; ++i)
4134 dwarf2_per_cu_data *per_cu = dwarf2_per_objfile->get_cutu (i);
4136 /* We don't want to directly expand a partial CU, because if we
4137 read it with the wrong language, then assertion failures can
4138 be triggered later on. See PR symtab/23010. So, tell
4139 dw2_instantiate_symtab to skip partial CUs -- any important
4140 partial CU will be read via DW_TAG_imported_unit anyway. */
4141 dw2_instantiate_symtab (per_cu, true);
4146 dw2_expand_symtabs_with_fullname (struct objfile *objfile,
4147 const char *fullname)
4149 struct dwarf2_per_objfile *dwarf2_per_objfile
4150 = get_dwarf2_per_objfile (objfile);
4152 /* We don't need to consider type units here.
4153 This is only called for examining code, e.g. expand_line_sal.
4154 There can be an order of magnitude (or more) more type units
4155 than comp units, and we avoid them if we can. */
4157 for (dwarf2_per_cu_data *per_cu : dwarf2_per_objfile->all_comp_units)
4159 /* We only need to look at symtabs not already expanded. */
4160 if (per_cu->v.quick->compunit_symtab)
4163 quick_file_names *file_data = dw2_get_file_names (per_cu);
4164 if (file_data == NULL)
4167 for (int j = 0; j < file_data->num_file_names; ++j)
4169 const char *this_fullname = file_data->file_names[j];
4171 if (filename_cmp (this_fullname, fullname) == 0)
4173 dw2_instantiate_symtab (per_cu, false);
4181 dw2_map_matching_symbols (struct objfile *objfile,
4182 const char * name, domain_enum domain,
4184 int (*callback) (struct block *,
4185 struct symbol *, void *),
4186 void *data, symbol_name_match_type match,
4187 symbol_compare_ftype *ordered_compare)
4189 /* Currently unimplemented; used for Ada. The function can be called if the
4190 current language is Ada for a non-Ada objfile using GNU index. As Ada
4191 does not look for non-Ada symbols this function should just return. */
4194 /* Symbol name matcher for .gdb_index names.
4196 Symbol names in .gdb_index have a few particularities:
4198 - There's no indication of which is the language of each symbol.
4200 Since each language has its own symbol name matching algorithm,
4201 and we don't know which language is the right one, we must match
4202 each symbol against all languages. This would be a potential
4203 performance problem if it were not mitigated by the
4204 mapped_index::name_components lookup table, which significantly
4205 reduces the number of times we need to call into this matcher,
4206 making it a non-issue.
4208 - Symbol names in the index have no overload (parameter)
4209 information. I.e., in C++, "foo(int)" and "foo(long)" both
4210 appear as "foo" in the index, for example.
4212 This means that the lookup names passed to the symbol name
4213 matcher functions must have no parameter information either
4214 because (e.g.) symbol search name "foo" does not match
4215 lookup-name "foo(int)" [while swapping search name for lookup
4218 class gdb_index_symbol_name_matcher
4221 /* Prepares the vector of comparison functions for LOOKUP_NAME. */
4222 gdb_index_symbol_name_matcher (const lookup_name_info &lookup_name);
4224 /* Walk all the matcher routines and match SYMBOL_NAME against them.
4225 Returns true if any matcher matches. */
4226 bool matches (const char *symbol_name);
4229 /* A reference to the lookup name we're matching against. */
4230 const lookup_name_info &m_lookup_name;
4232 /* A vector holding all the different symbol name matchers, for all
4234 std::vector<symbol_name_matcher_ftype *> m_symbol_name_matcher_funcs;
4237 gdb_index_symbol_name_matcher::gdb_index_symbol_name_matcher
4238 (const lookup_name_info &lookup_name)
4239 : m_lookup_name (lookup_name)
4241 /* Prepare the vector of comparison functions upfront, to avoid
4242 doing the same work for each symbol. Care is taken to avoid
4243 matching with the same matcher more than once if/when multiple
4244 languages use the same matcher function. */
4245 auto &matchers = m_symbol_name_matcher_funcs;
4246 matchers.reserve (nr_languages);
4248 matchers.push_back (default_symbol_name_matcher);
4250 for (int i = 0; i < nr_languages; i++)
4252 const language_defn *lang = language_def ((enum language) i);
4253 symbol_name_matcher_ftype *name_matcher
4254 = get_symbol_name_matcher (lang, m_lookup_name);
4256 /* Don't insert the same comparison routine more than once.
4257 Note that we do this linear walk instead of a seemingly
4258 cheaper sorted insert, or use a std::set or something like
4259 that, because relative order of function addresses is not
4260 stable. This is not a problem in practice because the number
4261 of supported languages is low, and the cost here is tiny
4262 compared to the number of searches we'll do afterwards using
4264 if (name_matcher != default_symbol_name_matcher
4265 && (std::find (matchers.begin (), matchers.end (), name_matcher)
4266 == matchers.end ()))
4267 matchers.push_back (name_matcher);
4272 gdb_index_symbol_name_matcher::matches (const char *symbol_name)
4274 for (auto matches_name : m_symbol_name_matcher_funcs)
4275 if (matches_name (symbol_name, m_lookup_name, NULL))
4281 /* Starting from a search name, return the string that finds the upper
4282 bound of all strings that start with SEARCH_NAME in a sorted name
4283 list. Returns the empty string to indicate that the upper bound is
4284 the end of the list. */
4287 make_sort_after_prefix_name (const char *search_name)
4289 /* When looking to complete "func", we find the upper bound of all
4290 symbols that start with "func" by looking for where we'd insert
4291 the closest string that would follow "func" in lexicographical
4292 order. Usually, that's "func"-with-last-character-incremented,
4293 i.e. "fund". Mind non-ASCII characters, though. Usually those
4294 will be UTF-8 multi-byte sequences, but we can't be certain.
4295 Especially mind the 0xff character, which is a valid character in
4296 non-UTF-8 source character sets (e.g. Latin1 'ÿ'), and we can't
4297 rule out compilers allowing it in identifiers. Note that
4298 conveniently, strcmp/strcasecmp are specified to compare
4299 characters interpreted as unsigned char. So what we do is treat
4300 the whole string as a base 256 number composed of a sequence of
4301 base 256 "digits" and add 1 to it. I.e., adding 1 to 0xff wraps
4302 to 0, and carries 1 to the following more-significant position.
4303 If the very first character in SEARCH_NAME ends up incremented
4304 and carries/overflows, then the upper bound is the end of the
4305 list. The string after the empty string is also the empty
4308 Some examples of this operation:
4310 SEARCH_NAME => "+1" RESULT
4314 "\xff" "a" "\xff" => "\xff" "b"
4319 Then, with these symbols for example:
4325 completing "func" looks for symbols between "func" and
4326 "func"-with-last-character-incremented, i.e. "fund" (exclusive),
4327 which finds "func" and "func1", but not "fund".
4331 funcÿ (Latin1 'ÿ' [0xff])
4335 completing "funcÿ" looks for symbols between "funcÿ" and "fund"
4336 (exclusive), which finds "funcÿ" and "funcÿ1", but not "fund".
4340 ÿÿ (Latin1 'ÿ' [0xff])
4343 completing "ÿ" or "ÿÿ" looks for symbols between between "ÿÿ" and
4344 the end of the list.
4346 std::string after = search_name;
4347 while (!after.empty () && (unsigned char) after.back () == 0xff)
4349 if (!after.empty ())
4350 after.back () = (unsigned char) after.back () + 1;
4354 /* See declaration. */
4356 std::pair<std::vector<name_component>::const_iterator,
4357 std::vector<name_component>::const_iterator>
4358 mapped_index_base::find_name_components_bounds
4359 (const lookup_name_info &lookup_name_without_params) const
4362 = this->name_components_casing == case_sensitive_on ? strcmp : strcasecmp;
4365 = lookup_name_without_params.cplus ().lookup_name ().c_str ();
4367 /* Comparison function object for lower_bound that matches against a
4368 given symbol name. */
4369 auto lookup_compare_lower = [&] (const name_component &elem,
4372 const char *elem_qualified = this->symbol_name_at (elem.idx);
4373 const char *elem_name = elem_qualified + elem.name_offset;
4374 return name_cmp (elem_name, name) < 0;
4377 /* Comparison function object for upper_bound that matches against a
4378 given symbol name. */
4379 auto lookup_compare_upper = [&] (const char *name,
4380 const name_component &elem)
4382 const char *elem_qualified = this->symbol_name_at (elem.idx);
4383 const char *elem_name = elem_qualified + elem.name_offset;
4384 return name_cmp (name, elem_name) < 0;
4387 auto begin = this->name_components.begin ();
4388 auto end = this->name_components.end ();
4390 /* Find the lower bound. */
4393 if (lookup_name_without_params.completion_mode () && cplus[0] == '\0')
4396 return std::lower_bound (begin, end, cplus, lookup_compare_lower);
4399 /* Find the upper bound. */
4402 if (lookup_name_without_params.completion_mode ())
4404 /* In completion mode, we want UPPER to point past all
4405 symbols names that have the same prefix. I.e., with
4406 these symbols, and completing "func":
4408 function << lower bound
4410 other_function << upper bound
4412 We find the upper bound by looking for the insertion
4413 point of "func"-with-last-character-incremented,
4415 std::string after = make_sort_after_prefix_name (cplus);
4418 return std::lower_bound (lower, end, after.c_str (),
4419 lookup_compare_lower);
4422 return std::upper_bound (lower, end, cplus, lookup_compare_upper);
4425 return {lower, upper};
4428 /* See declaration. */
4431 mapped_index_base::build_name_components ()
4433 if (!this->name_components.empty ())
4436 this->name_components_casing = case_sensitivity;
4438 = this->name_components_casing == case_sensitive_on ? strcmp : strcasecmp;
4440 /* The code below only knows how to break apart components of C++
4441 symbol names (and other languages that use '::' as
4442 namespace/module separator). If we add support for wild matching
4443 to some language that uses some other operator (E.g., Ada, Go and
4444 D use '.'), then we'll need to try splitting the symbol name
4445 according to that language too. Note that Ada does support wild
4446 matching, but doesn't currently support .gdb_index. */
4447 auto count = this->symbol_name_count ();
4448 for (offset_type idx = 0; idx < count; idx++)
4450 if (this->symbol_name_slot_invalid (idx))
4453 const char *name = this->symbol_name_at (idx);
4455 /* Add each name component to the name component table. */
4456 unsigned int previous_len = 0;
4457 for (unsigned int current_len = cp_find_first_component (name);
4458 name[current_len] != '\0';
4459 current_len += cp_find_first_component (name + current_len))
4461 gdb_assert (name[current_len] == ':');
4462 this->name_components.push_back ({previous_len, idx});
4463 /* Skip the '::'. */
4465 previous_len = current_len;
4467 this->name_components.push_back ({previous_len, idx});
4470 /* Sort name_components elements by name. */
4471 auto name_comp_compare = [&] (const name_component &left,
4472 const name_component &right)
4474 const char *left_qualified = this->symbol_name_at (left.idx);
4475 const char *right_qualified = this->symbol_name_at (right.idx);
4477 const char *left_name = left_qualified + left.name_offset;
4478 const char *right_name = right_qualified + right.name_offset;
4480 return name_cmp (left_name, right_name) < 0;
4483 std::sort (this->name_components.begin (),
4484 this->name_components.end (),
4488 /* Helper for dw2_expand_symtabs_matching that works with a
4489 mapped_index_base instead of the containing objfile. This is split
4490 to a separate function in order to be able to unit test the
4491 name_components matching using a mock mapped_index_base. For each
4492 symbol name that matches, calls MATCH_CALLBACK, passing it the
4493 symbol's index in the mapped_index_base symbol table. */
4496 dw2_expand_symtabs_matching_symbol
4497 (mapped_index_base &index,
4498 const lookup_name_info &lookup_name_in,
4499 gdb::function_view<expand_symtabs_symbol_matcher_ftype> symbol_matcher,
4500 enum search_domain kind,
4501 gdb::function_view<void (offset_type)> match_callback)
4503 lookup_name_info lookup_name_without_params
4504 = lookup_name_in.make_ignore_params ();
4505 gdb_index_symbol_name_matcher lookup_name_matcher
4506 (lookup_name_without_params);
4508 /* Build the symbol name component sorted vector, if we haven't
4510 index.build_name_components ();
4512 auto bounds = index.find_name_components_bounds (lookup_name_without_params);
4514 /* Now for each symbol name in range, check to see if we have a name
4515 match, and if so, call the MATCH_CALLBACK callback. */
4517 /* The same symbol may appear more than once in the range though.
4518 E.g., if we're looking for symbols that complete "w", and we have
4519 a symbol named "w1::w2", we'll find the two name components for
4520 that same symbol in the range. To be sure we only call the
4521 callback once per symbol, we first collect the symbol name
4522 indexes that matched in a temporary vector and ignore
4524 std::vector<offset_type> matches;
4525 matches.reserve (std::distance (bounds.first, bounds.second));
4527 for (; bounds.first != bounds.second; ++bounds.first)
4529 const char *qualified = index.symbol_name_at (bounds.first->idx);
4531 if (!lookup_name_matcher.matches (qualified)
4532 || (symbol_matcher != NULL && !symbol_matcher (qualified)))
4535 matches.push_back (bounds.first->idx);
4538 std::sort (matches.begin (), matches.end ());
4540 /* Finally call the callback, once per match. */
4542 for (offset_type idx : matches)
4546 match_callback (idx);
4551 /* Above we use a type wider than idx's for 'prev', since 0 and
4552 (offset_type)-1 are both possible values. */
4553 static_assert (sizeof (prev) > sizeof (offset_type), "");
4558 namespace selftests { namespace dw2_expand_symtabs_matching {
4560 /* A mock .gdb_index/.debug_names-like name index table, enough to
4561 exercise dw2_expand_symtabs_matching_symbol, which works with the
4562 mapped_index_base interface. Builds an index from the symbol list
4563 passed as parameter to the constructor. */
4564 class mock_mapped_index : public mapped_index_base
4567 mock_mapped_index (gdb::array_view<const char *> symbols)
4568 : m_symbol_table (symbols)
4571 DISABLE_COPY_AND_ASSIGN (mock_mapped_index);
4573 /* Return the number of names in the symbol table. */
4574 size_t symbol_name_count () const override
4576 return m_symbol_table.size ();
4579 /* Get the name of the symbol at IDX in the symbol table. */
4580 const char *symbol_name_at (offset_type idx) const override
4582 return m_symbol_table[idx];
4586 gdb::array_view<const char *> m_symbol_table;
4589 /* Convenience function that converts a NULL pointer to a "<null>"
4590 string, to pass to print routines. */
4593 string_or_null (const char *str)
4595 return str != NULL ? str : "<null>";
4598 /* Check if a lookup_name_info built from
4599 NAME/MATCH_TYPE/COMPLETION_MODE matches the symbols in the mock
4600 index. EXPECTED_LIST is the list of expected matches, in expected
4601 matching order. If no match expected, then an empty list is
4602 specified. Returns true on success. On failure prints a warning
4603 indicating the file:line that failed, and returns false. */
4606 check_match (const char *file, int line,
4607 mock_mapped_index &mock_index,
4608 const char *name, symbol_name_match_type match_type,
4609 bool completion_mode,
4610 std::initializer_list<const char *> expected_list)
4612 lookup_name_info lookup_name (name, match_type, completion_mode);
4614 bool matched = true;
4616 auto mismatch = [&] (const char *expected_str,
4619 warning (_("%s:%d: match_type=%s, looking-for=\"%s\", "
4620 "expected=\"%s\", got=\"%s\"\n"),
4622 (match_type == symbol_name_match_type::FULL
4624 name, string_or_null (expected_str), string_or_null (got));
4628 auto expected_it = expected_list.begin ();
4629 auto expected_end = expected_list.end ();
4631 dw2_expand_symtabs_matching_symbol (mock_index, lookup_name,
4633 [&] (offset_type idx)
4635 const char *matched_name = mock_index.symbol_name_at (idx);
4636 const char *expected_str
4637 = expected_it == expected_end ? NULL : *expected_it++;
4639 if (expected_str == NULL || strcmp (expected_str, matched_name) != 0)
4640 mismatch (expected_str, matched_name);
4643 const char *expected_str
4644 = expected_it == expected_end ? NULL : *expected_it++;
4645 if (expected_str != NULL)
4646 mismatch (expected_str, NULL);
4651 /* The symbols added to the mock mapped_index for testing (in
4653 static const char *test_symbols[] = {
4662 "ns2::tmpl<int>::foo2",
4663 "(anonymous namespace)::A::B::C",
4665 /* These are used to check that the increment-last-char in the
4666 matching algorithm for completion doesn't match "t1_fund" when
4667 completing "t1_func". */
4673 /* A UTF-8 name with multi-byte sequences to make sure that
4674 cp-name-parser understands this as a single identifier ("função"
4675 is "function" in PT). */
4678 /* \377 (0xff) is Latin1 'ÿ'. */
4681 /* \377 (0xff) is Latin1 'ÿ'. */
4685 /* A name with all sorts of complications. Starts with "z" to make
4686 it easier for the completion tests below. */
4687 #define Z_SYM_NAME \
4688 "z::std::tuple<(anonymous namespace)::ui*, std::bar<(anonymous namespace)::ui> >" \
4689 "::tuple<(anonymous namespace)::ui*, " \
4690 "std::default_delete<(anonymous namespace)::ui>, void>"
4695 /* Returns true if the mapped_index_base::find_name_component_bounds
4696 method finds EXPECTED_SYMS in INDEX when looking for SEARCH_NAME,
4697 in completion mode. */
4700 check_find_bounds_finds (mapped_index_base &index,
4701 const char *search_name,
4702 gdb::array_view<const char *> expected_syms)
4704 lookup_name_info lookup_name (search_name,
4705 symbol_name_match_type::FULL, true);
4707 auto bounds = index.find_name_components_bounds (lookup_name);
4709 size_t distance = std::distance (bounds.first, bounds.second);
4710 if (distance != expected_syms.size ())
4713 for (size_t exp_elem = 0; exp_elem < distance; exp_elem++)
4715 auto nc_elem = bounds.first + exp_elem;
4716 const char *qualified = index.symbol_name_at (nc_elem->idx);
4717 if (strcmp (qualified, expected_syms[exp_elem]) != 0)
4724 /* Test the lower-level mapped_index::find_name_component_bounds
4728 test_mapped_index_find_name_component_bounds ()
4730 mock_mapped_index mock_index (test_symbols);
4732 mock_index.build_name_components ();
4734 /* Test the lower-level mapped_index::find_name_component_bounds
4735 method in completion mode. */
4737 static const char *expected_syms[] = {
4742 SELF_CHECK (check_find_bounds_finds (mock_index,
4743 "t1_func", expected_syms));
4746 /* Check that the increment-last-char in the name matching algorithm
4747 for completion doesn't get confused with Ansi1 'ÿ' / 0xff. */
4749 static const char *expected_syms1[] = {
4753 SELF_CHECK (check_find_bounds_finds (mock_index,
4754 "\377", expected_syms1));
4756 static const char *expected_syms2[] = {
4759 SELF_CHECK (check_find_bounds_finds (mock_index,
4760 "\377\377", expected_syms2));
4764 /* Test dw2_expand_symtabs_matching_symbol. */
4767 test_dw2_expand_symtabs_matching_symbol ()
4769 mock_mapped_index mock_index (test_symbols);
4771 /* We let all tests run until the end even if some fails, for debug
4773 bool any_mismatch = false;
4775 /* Create the expected symbols list (an initializer_list). Needed
4776 because lists have commas, and we need to pass them to CHECK,
4777 which is a macro. */
4778 #define EXPECT(...) { __VA_ARGS__ }
4780 /* Wrapper for check_match that passes down the current
4781 __FILE__/__LINE__. */
4782 #define CHECK_MATCH(NAME, MATCH_TYPE, COMPLETION_MODE, EXPECTED_LIST) \
4783 any_mismatch |= !check_match (__FILE__, __LINE__, \
4785 NAME, MATCH_TYPE, COMPLETION_MODE, \
4788 /* Identity checks. */
4789 for (const char *sym : test_symbols)
4791 /* Should be able to match all existing symbols. */
4792 CHECK_MATCH (sym, symbol_name_match_type::FULL, false,
4795 /* Should be able to match all existing symbols with
4797 std::string with_params = std::string (sym) + "(int)";
4798 CHECK_MATCH (with_params.c_str (), symbol_name_match_type::FULL, false,
4801 /* Should be able to match all existing symbols with
4802 parameters and qualifiers. */
4803 with_params = std::string (sym) + " ( int ) const";
4804 CHECK_MATCH (with_params.c_str (), symbol_name_match_type::FULL, false,
4807 /* This should really find sym, but cp-name-parser.y doesn't
4808 know about lvalue/rvalue qualifiers yet. */
4809 with_params = std::string (sym) + " ( int ) &&";
4810 CHECK_MATCH (with_params.c_str (), symbol_name_match_type::FULL, false,
4814 /* Check that the name matching algorithm for completion doesn't get
4815 confused with Latin1 'ÿ' / 0xff. */
4817 static const char str[] = "\377";
4818 CHECK_MATCH (str, symbol_name_match_type::FULL, true,
4819 EXPECT ("\377", "\377\377123"));
4822 /* Check that the increment-last-char in the matching algorithm for
4823 completion doesn't match "t1_fund" when completing "t1_func". */
4825 static const char str[] = "t1_func";
4826 CHECK_MATCH (str, symbol_name_match_type::FULL, true,
4827 EXPECT ("t1_func", "t1_func1"));
4830 /* Check that completion mode works at each prefix of the expected
4833 static const char str[] = "function(int)";
4834 size_t len = strlen (str);
4837 for (size_t i = 1; i < len; i++)
4839 lookup.assign (str, i);
4840 CHECK_MATCH (lookup.c_str (), symbol_name_match_type::FULL, true,
4841 EXPECT ("function"));
4845 /* While "w" is a prefix of both components, the match function
4846 should still only be called once. */
4848 CHECK_MATCH ("w", symbol_name_match_type::FULL, true,
4850 CHECK_MATCH ("w", symbol_name_match_type::WILD, true,
4854 /* Same, with a "complicated" symbol. */
4856 static const char str[] = Z_SYM_NAME;
4857 size_t len = strlen (str);
4860 for (size_t i = 1; i < len; i++)
4862 lookup.assign (str, i);
4863 CHECK_MATCH (lookup.c_str (), symbol_name_match_type::FULL, true,
4864 EXPECT (Z_SYM_NAME));
4868 /* In FULL mode, an incomplete symbol doesn't match. */
4870 CHECK_MATCH ("std::zfunction(int", symbol_name_match_type::FULL, false,
4874 /* A complete symbol with parameters matches any overload, since the
4875 index has no overload info. */
4877 CHECK_MATCH ("std::zfunction(int)", symbol_name_match_type::FULL, true,
4878 EXPECT ("std::zfunction", "std::zfunction2"));
4879 CHECK_MATCH ("zfunction(int)", symbol_name_match_type::WILD, true,
4880 EXPECT ("std::zfunction", "std::zfunction2"));
4881 CHECK_MATCH ("zfunc", symbol_name_match_type::WILD, true,
4882 EXPECT ("std::zfunction", "std::zfunction2"));
4885 /* Check that whitespace is ignored appropriately. A symbol with a
4886 template argument list. */
4888 static const char expected[] = "ns::foo<int>";
4889 CHECK_MATCH ("ns :: foo < int > ", symbol_name_match_type::FULL, false,
4891 CHECK_MATCH ("foo < int > ", symbol_name_match_type::WILD, false,
4895 /* Check that whitespace is ignored appropriately. A symbol with a
4896 template argument list that includes a pointer. */
4898 static const char expected[] = "ns::foo<char*>";
4899 /* Try both completion and non-completion modes. */
4900 static const bool completion_mode[2] = {false, true};
4901 for (size_t i = 0; i < 2; i++)
4903 CHECK_MATCH ("ns :: foo < char * >", symbol_name_match_type::FULL,
4904 completion_mode[i], EXPECT (expected));
4905 CHECK_MATCH ("foo < char * >", symbol_name_match_type::WILD,
4906 completion_mode[i], EXPECT (expected));
4908 CHECK_MATCH ("ns :: foo < char * > (int)", symbol_name_match_type::FULL,
4909 completion_mode[i], EXPECT (expected));
4910 CHECK_MATCH ("foo < char * > (int)", symbol_name_match_type::WILD,
4911 completion_mode[i], EXPECT (expected));
4916 /* Check method qualifiers are ignored. */
4917 static const char expected[] = "ns::foo<char*>";
4918 CHECK_MATCH ("ns :: foo < char * > ( int ) const",
4919 symbol_name_match_type::FULL, true, EXPECT (expected));
4920 CHECK_MATCH ("ns :: foo < char * > ( int ) &&",
4921 symbol_name_match_type::FULL, true, EXPECT (expected));
4922 CHECK_MATCH ("foo < char * > ( int ) const",
4923 symbol_name_match_type::WILD, true, EXPECT (expected));
4924 CHECK_MATCH ("foo < char * > ( int ) &&",
4925 symbol_name_match_type::WILD, true, EXPECT (expected));
4928 /* Test lookup names that don't match anything. */
4930 CHECK_MATCH ("bar2", symbol_name_match_type::WILD, false,
4933 CHECK_MATCH ("doesntexist", symbol_name_match_type::FULL, false,
4937 /* Some wild matching tests, exercising "(anonymous namespace)",
4938 which should not be confused with a parameter list. */
4940 static const char *syms[] = {
4944 "A :: B :: C ( int )",
4949 for (const char *s : syms)
4951 CHECK_MATCH (s, symbol_name_match_type::WILD, false,
4952 EXPECT ("(anonymous namespace)::A::B::C"));
4957 static const char expected[] = "ns2::tmpl<int>::foo2";
4958 CHECK_MATCH ("tmp", symbol_name_match_type::WILD, true,
4960 CHECK_MATCH ("tmpl<", symbol_name_match_type::WILD, true,
4964 SELF_CHECK (!any_mismatch);
4973 test_mapped_index_find_name_component_bounds ();
4974 test_dw2_expand_symtabs_matching_symbol ();
4977 }} // namespace selftests::dw2_expand_symtabs_matching
4979 #endif /* GDB_SELF_TEST */
4981 /* If FILE_MATCHER is NULL or if PER_CU has
4982 dwarf2_per_cu_quick_data::MARK set (see
4983 dw_expand_symtabs_matching_file_matcher), expand the CU and call
4984 EXPANSION_NOTIFY on it. */
4987 dw2_expand_symtabs_matching_one
4988 (struct dwarf2_per_cu_data *per_cu,
4989 gdb::function_view<expand_symtabs_file_matcher_ftype> file_matcher,
4990 gdb::function_view<expand_symtabs_exp_notify_ftype> expansion_notify)
4992 if (file_matcher == NULL || per_cu->v.quick->mark)
4994 bool symtab_was_null
4995 = (per_cu->v.quick->compunit_symtab == NULL);
4997 dw2_instantiate_symtab (per_cu, false);
4999 if (expansion_notify != NULL
5001 && per_cu->v.quick->compunit_symtab != NULL)
5002 expansion_notify (per_cu->v.quick->compunit_symtab);
5006 /* Helper for dw2_expand_matching symtabs. Called on each symbol
5007 matched, to expand corresponding CUs that were marked. IDX is the
5008 index of the symbol name that matched. */
5011 dw2_expand_marked_cus
5012 (struct dwarf2_per_objfile *dwarf2_per_objfile, offset_type idx,
5013 gdb::function_view<expand_symtabs_file_matcher_ftype> file_matcher,
5014 gdb::function_view<expand_symtabs_exp_notify_ftype> expansion_notify,
5017 offset_type *vec, vec_len, vec_idx;
5018 bool global_seen = false;
5019 mapped_index &index = *dwarf2_per_objfile->index_table;
5021 vec = (offset_type *) (index.constant_pool
5022 + MAYBE_SWAP (index.symbol_table[idx].vec));
5023 vec_len = MAYBE_SWAP (vec[0]);
5024 for (vec_idx = 0; vec_idx < vec_len; ++vec_idx)
5026 offset_type cu_index_and_attrs = MAYBE_SWAP (vec[vec_idx + 1]);
5027 /* This value is only valid for index versions >= 7. */
5028 int is_static = GDB_INDEX_SYMBOL_STATIC_VALUE (cu_index_and_attrs);
5029 gdb_index_symbol_kind symbol_kind =
5030 GDB_INDEX_SYMBOL_KIND_VALUE (cu_index_and_attrs);
5031 int cu_index = GDB_INDEX_CU_VALUE (cu_index_and_attrs);
5032 /* Only check the symbol attributes if they're present.
5033 Indices prior to version 7 don't record them,
5034 and indices >= 7 may elide them for certain symbols
5035 (gold does this). */
5038 && symbol_kind != GDB_INDEX_SYMBOL_KIND_NONE);
5040 /* Work around gold/15646. */
5043 if (!is_static && global_seen)
5049 /* Only check the symbol's kind if it has one. */
5054 case VARIABLES_DOMAIN:
5055 if (symbol_kind != GDB_INDEX_SYMBOL_KIND_VARIABLE)
5058 case FUNCTIONS_DOMAIN:
5059 if (symbol_kind != GDB_INDEX_SYMBOL_KIND_FUNCTION)
5063 if (symbol_kind != GDB_INDEX_SYMBOL_KIND_TYPE)
5071 /* Don't crash on bad data. */
5072 if (cu_index >= (dwarf2_per_objfile->all_comp_units.size ()
5073 + dwarf2_per_objfile->all_type_units.size ()))
5075 complaint (&symfile_complaints,
5076 _(".gdb_index entry has bad CU index"
5078 objfile_name (dwarf2_per_objfile->objfile));
5082 dwarf2_per_cu_data *per_cu = dwarf2_per_objfile->get_cutu (cu_index);
5083 dw2_expand_symtabs_matching_one (per_cu, file_matcher,
5088 /* If FILE_MATCHER is non-NULL, set all the
5089 dwarf2_per_cu_quick_data::MARK of the current DWARF2_PER_OBJFILE
5090 that match FILE_MATCHER. */
5093 dw_expand_symtabs_matching_file_matcher
5094 (struct dwarf2_per_objfile *dwarf2_per_objfile,
5095 gdb::function_view<expand_symtabs_file_matcher_ftype> file_matcher)
5097 if (file_matcher == NULL)
5100 objfile *const objfile = dwarf2_per_objfile->objfile;
5102 htab_up visited_found (htab_create_alloc (10, htab_hash_pointer,
5104 NULL, xcalloc, xfree));
5105 htab_up visited_not_found (htab_create_alloc (10, htab_hash_pointer,
5107 NULL, xcalloc, xfree));
5109 /* The rule is CUs specify all the files, including those used by
5110 any TU, so there's no need to scan TUs here. */
5112 for (dwarf2_per_cu_data *per_cu : dwarf2_per_objfile->all_comp_units)
5116 per_cu->v.quick->mark = 0;
5118 /* We only need to look at symtabs not already expanded. */
5119 if (per_cu->v.quick->compunit_symtab)
5122 quick_file_names *file_data = dw2_get_file_names (per_cu);
5123 if (file_data == NULL)
5126 if (htab_find (visited_not_found.get (), file_data) != NULL)
5128 else if (htab_find (visited_found.get (), file_data) != NULL)
5130 per_cu->v.quick->mark = 1;
5134 for (int j = 0; j < file_data->num_file_names; ++j)
5136 const char *this_real_name;
5138 if (file_matcher (file_data->file_names[j], false))
5140 per_cu->v.quick->mark = 1;
5144 /* Before we invoke realpath, which can get expensive when many
5145 files are involved, do a quick comparison of the basenames. */
5146 if (!basenames_may_differ
5147 && !file_matcher (lbasename (file_data->file_names[j]),
5151 this_real_name = dw2_get_real_path (objfile, file_data, j);
5152 if (file_matcher (this_real_name, false))
5154 per_cu->v.quick->mark = 1;
5159 void **slot = htab_find_slot (per_cu->v.quick->mark
5160 ? visited_found.get ()
5161 : visited_not_found.get (),
5168 dw2_expand_symtabs_matching
5169 (struct objfile *objfile,
5170 gdb::function_view<expand_symtabs_file_matcher_ftype> file_matcher,
5171 const lookup_name_info &lookup_name,
5172 gdb::function_view<expand_symtabs_symbol_matcher_ftype> symbol_matcher,
5173 gdb::function_view<expand_symtabs_exp_notify_ftype> expansion_notify,
5174 enum search_domain kind)
5176 struct dwarf2_per_objfile *dwarf2_per_objfile
5177 = get_dwarf2_per_objfile (objfile);
5179 /* index_table is NULL if OBJF_READNOW. */
5180 if (!dwarf2_per_objfile->index_table)
5183 dw_expand_symtabs_matching_file_matcher (dwarf2_per_objfile, file_matcher);
5185 mapped_index &index = *dwarf2_per_objfile->index_table;
5187 dw2_expand_symtabs_matching_symbol (index, lookup_name,
5189 kind, [&] (offset_type idx)
5191 dw2_expand_marked_cus (dwarf2_per_objfile, idx, file_matcher,
5192 expansion_notify, kind);
5196 /* A helper for dw2_find_pc_sect_compunit_symtab which finds the most specific
5199 static struct compunit_symtab *
5200 recursively_find_pc_sect_compunit_symtab (struct compunit_symtab *cust,
5205 if (COMPUNIT_BLOCKVECTOR (cust) != NULL
5206 && blockvector_contains_pc (COMPUNIT_BLOCKVECTOR (cust), pc))
5209 if (cust->includes == NULL)
5212 for (i = 0; cust->includes[i]; ++i)
5214 struct compunit_symtab *s = cust->includes[i];
5216 s = recursively_find_pc_sect_compunit_symtab (s, pc);
5224 static struct compunit_symtab *
5225 dw2_find_pc_sect_compunit_symtab (struct objfile *objfile,
5226 struct bound_minimal_symbol msymbol,
5228 struct obj_section *section,
5231 struct dwarf2_per_cu_data *data;
5232 struct compunit_symtab *result;
5234 if (!objfile->psymtabs_addrmap)
5237 data = (struct dwarf2_per_cu_data *) addrmap_find (objfile->psymtabs_addrmap,
5242 if (warn_if_readin && data->v.quick->compunit_symtab)
5243 warning (_("(Internal error: pc %s in read in CU, but not in symtab.)"),
5244 paddress (get_objfile_arch (objfile), pc));
5247 = recursively_find_pc_sect_compunit_symtab (dw2_instantiate_symtab (data,
5250 gdb_assert (result != NULL);
5255 dw2_map_symbol_filenames (struct objfile *objfile, symbol_filename_ftype *fun,
5256 void *data, int need_fullname)
5258 struct dwarf2_per_objfile *dwarf2_per_objfile
5259 = get_dwarf2_per_objfile (objfile);
5261 if (!dwarf2_per_objfile->filenames_cache)
5263 dwarf2_per_objfile->filenames_cache.emplace ();
5265 htab_up visited (htab_create_alloc (10,
5266 htab_hash_pointer, htab_eq_pointer,
5267 NULL, xcalloc, xfree));
5269 /* The rule is CUs specify all the files, including those used
5270 by any TU, so there's no need to scan TUs here. We can
5271 ignore file names coming from already-expanded CUs. */
5273 for (dwarf2_per_cu_data *per_cu : dwarf2_per_objfile->all_comp_units)
5275 if (per_cu->v.quick->compunit_symtab)
5277 void **slot = htab_find_slot (visited.get (),
5278 per_cu->v.quick->file_names,
5281 *slot = per_cu->v.quick->file_names;
5285 for (dwarf2_per_cu_data *per_cu : dwarf2_per_objfile->all_comp_units)
5287 /* We only need to look at symtabs not already expanded. */
5288 if (per_cu->v.quick->compunit_symtab)
5291 quick_file_names *file_data = dw2_get_file_names (per_cu);
5292 if (file_data == NULL)
5295 void **slot = htab_find_slot (visited.get (), file_data, INSERT);
5298 /* Already visited. */
5303 for (int j = 0; j < file_data->num_file_names; ++j)
5305 const char *filename = file_data->file_names[j];
5306 dwarf2_per_objfile->filenames_cache->seen (filename);
5311 dwarf2_per_objfile->filenames_cache->traverse ([&] (const char *filename)
5313 gdb::unique_xmalloc_ptr<char> this_real_name;
5316 this_real_name = gdb_realpath (filename);
5317 (*fun) (filename, this_real_name.get (), data);
5322 dw2_has_symbols (struct objfile *objfile)
5327 const struct quick_symbol_functions dwarf2_gdb_index_functions =
5330 dw2_find_last_source_symtab,
5331 dw2_forget_cached_source_info,
5332 dw2_map_symtabs_matching_filename,
5337 dw2_expand_symtabs_for_function,
5338 dw2_expand_all_symtabs,
5339 dw2_expand_symtabs_with_fullname,
5340 dw2_map_matching_symbols,
5341 dw2_expand_symtabs_matching,
5342 dw2_find_pc_sect_compunit_symtab,
5344 dw2_map_symbol_filenames
5347 /* DWARF-5 debug_names reader. */
5349 /* DWARF-5 augmentation string for GDB's DW_IDX_GNU_* extension. */
5350 static const gdb_byte dwarf5_augmentation[] = { 'G', 'D', 'B', 0 };
5352 /* A helper function that reads the .debug_names section in SECTION
5353 and fills in MAP. FILENAME is the name of the file containing the
5354 section; it is used for error reporting.
5356 Returns true if all went well, false otherwise. */
5359 read_debug_names_from_section (struct objfile *objfile,
5360 const char *filename,
5361 struct dwarf2_section_info *section,
5362 mapped_debug_names &map)
5364 if (dwarf2_section_empty_p (section))
5367 /* Older elfutils strip versions could keep the section in the main
5368 executable while splitting it for the separate debug info file. */
5369 if ((get_section_flags (section) & SEC_HAS_CONTENTS) == 0)
5372 dwarf2_read_section (objfile, section);
5374 map.dwarf5_byte_order = gdbarch_byte_order (get_objfile_arch (objfile));
5376 const gdb_byte *addr = section->buffer;
5378 bfd *const abfd = get_section_bfd_owner (section);
5380 unsigned int bytes_read;
5381 LONGEST length = read_initial_length (abfd, addr, &bytes_read);
5384 map.dwarf5_is_dwarf64 = bytes_read != 4;
5385 map.offset_size = map.dwarf5_is_dwarf64 ? 8 : 4;
5386 if (bytes_read + length != section->size)
5388 /* There may be multiple per-CU indices. */
5389 warning (_("Section .debug_names in %s length %s does not match "
5390 "section length %s, ignoring .debug_names."),
5391 filename, plongest (bytes_read + length),
5392 pulongest (section->size));
5396 /* The version number. */
5397 uint16_t version = read_2_bytes (abfd, addr);
5401 warning (_("Section .debug_names in %s has unsupported version %d, "
5402 "ignoring .debug_names."),
5408 uint16_t padding = read_2_bytes (abfd, addr);
5412 warning (_("Section .debug_names in %s has unsupported padding %d, "
5413 "ignoring .debug_names."),
5418 /* comp_unit_count - The number of CUs in the CU list. */
5419 map.cu_count = read_4_bytes (abfd, addr);
5422 /* local_type_unit_count - The number of TUs in the local TU
5424 map.tu_count = read_4_bytes (abfd, addr);
5427 /* foreign_type_unit_count - The number of TUs in the foreign TU
5429 uint32_t foreign_tu_count = read_4_bytes (abfd, addr);
5431 if (foreign_tu_count != 0)
5433 warning (_("Section .debug_names in %s has unsupported %lu foreign TUs, "
5434 "ignoring .debug_names."),
5435 filename, static_cast<unsigned long> (foreign_tu_count));
5439 /* bucket_count - The number of hash buckets in the hash lookup
5441 map.bucket_count = read_4_bytes (abfd, addr);
5444 /* name_count - The number of unique names in the index. */
5445 map.name_count = read_4_bytes (abfd, addr);
5448 /* abbrev_table_size - The size in bytes of the abbreviations
5450 uint32_t abbrev_table_size = read_4_bytes (abfd, addr);
5453 /* augmentation_string_size - The size in bytes of the augmentation
5454 string. This value is rounded up to a multiple of 4. */
5455 uint32_t augmentation_string_size = read_4_bytes (abfd, addr);
5457 map.augmentation_is_gdb = ((augmentation_string_size
5458 == sizeof (dwarf5_augmentation))
5459 && memcmp (addr, dwarf5_augmentation,
5460 sizeof (dwarf5_augmentation)) == 0);
5461 augmentation_string_size += (-augmentation_string_size) & 3;
5462 addr += augmentation_string_size;
5465 map.cu_table_reordered = addr;
5466 addr += map.cu_count * map.offset_size;
5468 /* List of Local TUs */
5469 map.tu_table_reordered = addr;
5470 addr += map.tu_count * map.offset_size;
5472 /* Hash Lookup Table */
5473 map.bucket_table_reordered = reinterpret_cast<const uint32_t *> (addr);
5474 addr += map.bucket_count * 4;
5475 map.hash_table_reordered = reinterpret_cast<const uint32_t *> (addr);
5476 addr += map.name_count * 4;
5479 map.name_table_string_offs_reordered = addr;
5480 addr += map.name_count * map.offset_size;
5481 map.name_table_entry_offs_reordered = addr;
5482 addr += map.name_count * map.offset_size;
5484 const gdb_byte *abbrev_table_start = addr;
5487 unsigned int bytes_read;
5488 const ULONGEST index_num = read_unsigned_leb128 (abfd, addr, &bytes_read);
5493 const auto insertpair
5494 = map.abbrev_map.emplace (index_num, mapped_debug_names::index_val ());
5495 if (!insertpair.second)
5497 warning (_("Section .debug_names in %s has duplicate index %s, "
5498 "ignoring .debug_names."),
5499 filename, pulongest (index_num));
5502 mapped_debug_names::index_val &indexval = insertpair.first->second;
5503 indexval.dwarf_tag = read_unsigned_leb128 (abfd, addr, &bytes_read);
5508 mapped_debug_names::index_val::attr attr;
5509 attr.dw_idx = read_unsigned_leb128 (abfd, addr, &bytes_read);
5511 attr.form = read_unsigned_leb128 (abfd, addr, &bytes_read);
5513 if (attr.form == DW_FORM_implicit_const)
5515 attr.implicit_const = read_signed_leb128 (abfd, addr,
5519 if (attr.dw_idx == 0 && attr.form == 0)
5521 indexval.attr_vec.push_back (std::move (attr));
5524 if (addr != abbrev_table_start + abbrev_table_size)
5526 warning (_("Section .debug_names in %s has abbreviation_table "
5527 "of size %zu vs. written as %u, ignoring .debug_names."),
5528 filename, addr - abbrev_table_start, abbrev_table_size);
5531 map.entry_pool = addr;
5536 /* A helper for create_cus_from_debug_names that handles the MAP's CU
5540 create_cus_from_debug_names_list (struct dwarf2_per_objfile *dwarf2_per_objfile,
5541 const mapped_debug_names &map,
5542 dwarf2_section_info §ion,
5545 sect_offset sect_off_prev;
5546 for (uint32_t i = 0; i <= map.cu_count; ++i)
5548 sect_offset sect_off_next;
5549 if (i < map.cu_count)
5552 = (sect_offset) (extract_unsigned_integer
5553 (map.cu_table_reordered + i * map.offset_size,
5555 map.dwarf5_byte_order));
5558 sect_off_next = (sect_offset) section.size;
5561 const ULONGEST length = sect_off_next - sect_off_prev;
5562 dwarf2_per_cu_data *per_cu
5563 = create_cu_from_index_list (dwarf2_per_objfile, §ion, is_dwz,
5564 sect_off_prev, length);
5565 dwarf2_per_objfile->all_comp_units.push_back (per_cu);
5567 sect_off_prev = sect_off_next;
5571 /* Read the CU list from the mapped index, and use it to create all
5572 the CU objects for this dwarf2_per_objfile. */
5575 create_cus_from_debug_names (struct dwarf2_per_objfile *dwarf2_per_objfile,
5576 const mapped_debug_names &map,
5577 const mapped_debug_names &dwz_map)
5579 gdb_assert (dwarf2_per_objfile->all_comp_units.empty ());
5580 dwarf2_per_objfile->all_comp_units.reserve (map.cu_count + dwz_map.cu_count);
5582 create_cus_from_debug_names_list (dwarf2_per_objfile, map,
5583 dwarf2_per_objfile->info,
5584 false /* is_dwz */);
5586 if (dwz_map.cu_count == 0)
5589 dwz_file *dwz = dwarf2_get_dwz_file (dwarf2_per_objfile);
5590 create_cus_from_debug_names_list (dwarf2_per_objfile, dwz_map, dwz->info,
5594 /* Read .debug_names. If everything went ok, initialize the "quick"
5595 elements of all the CUs and return true. Otherwise, return false. */
5598 dwarf2_read_debug_names (struct dwarf2_per_objfile *dwarf2_per_objfile)
5600 mapped_debug_names local_map (dwarf2_per_objfile);
5601 mapped_debug_names dwz_map (dwarf2_per_objfile);
5602 struct objfile *objfile = dwarf2_per_objfile->objfile;
5604 if (!read_debug_names_from_section (objfile, objfile_name (objfile),
5605 &dwarf2_per_objfile->debug_names,
5609 /* Don't use the index if it's empty. */
5610 if (local_map.name_count == 0)
5613 /* If there is a .dwz file, read it so we can get its CU list as
5615 dwz_file *dwz = dwarf2_get_dwz_file (dwarf2_per_objfile);
5618 if (!read_debug_names_from_section (objfile,
5619 bfd_get_filename (dwz->dwz_bfd),
5620 &dwz->debug_names, dwz_map))
5622 warning (_("could not read '.debug_names' section from %s; skipping"),
5623 bfd_get_filename (dwz->dwz_bfd));
5628 create_cus_from_debug_names (dwarf2_per_objfile, local_map, dwz_map);
5630 if (local_map.tu_count != 0)
5632 /* We can only handle a single .debug_types when we have an
5634 if (VEC_length (dwarf2_section_info_def, dwarf2_per_objfile->types) != 1)
5637 dwarf2_section_info *section = VEC_index (dwarf2_section_info_def,
5638 dwarf2_per_objfile->types, 0);
5640 create_signatured_type_table_from_debug_names
5641 (dwarf2_per_objfile, local_map, section, &dwarf2_per_objfile->abbrev);
5644 create_addrmap_from_aranges (dwarf2_per_objfile,
5645 &dwarf2_per_objfile->debug_aranges);
5647 dwarf2_per_objfile->debug_names_table.reset
5648 (new mapped_debug_names (dwarf2_per_objfile));
5649 *dwarf2_per_objfile->debug_names_table = std::move (local_map);
5650 dwarf2_per_objfile->using_index = 1;
5651 dwarf2_per_objfile->quick_file_names_table =
5652 create_quick_file_names_table (dwarf2_per_objfile->all_comp_units.size ());
5657 /* Type used to manage iterating over all CUs looking for a symbol for
5660 class dw2_debug_names_iterator
5663 /* If WANT_SPECIFIC_BLOCK is true, only look for symbols in block
5664 BLOCK_INDEX. Otherwise BLOCK_INDEX is ignored. */
5665 dw2_debug_names_iterator (const mapped_debug_names &map,
5666 bool want_specific_block,
5667 block_enum block_index, domain_enum domain,
5669 : m_map (map), m_want_specific_block (want_specific_block),
5670 m_block_index (block_index), m_domain (domain),
5671 m_addr (find_vec_in_debug_names (map, name))
5674 dw2_debug_names_iterator (const mapped_debug_names &map,
5675 search_domain search, uint32_t namei)
5678 m_addr (find_vec_in_debug_names (map, namei))
5681 /* Return the next matching CU or NULL if there are no more. */
5682 dwarf2_per_cu_data *next ();
5685 static const gdb_byte *find_vec_in_debug_names (const mapped_debug_names &map,
5687 static const gdb_byte *find_vec_in_debug_names (const mapped_debug_names &map,
5690 /* The internalized form of .debug_names. */
5691 const mapped_debug_names &m_map;
5693 /* If true, only look for symbols that match BLOCK_INDEX. */
5694 const bool m_want_specific_block = false;
5696 /* One of GLOBAL_BLOCK or STATIC_BLOCK.
5697 Unused if !WANT_SPECIFIC_BLOCK - FIRST_LOCAL_BLOCK is an invalid
5699 const block_enum m_block_index = FIRST_LOCAL_BLOCK;
5701 /* The kind of symbol we're looking for. */
5702 const domain_enum m_domain = UNDEF_DOMAIN;
5703 const search_domain m_search = ALL_DOMAIN;
5705 /* The list of CUs from the index entry of the symbol, or NULL if
5707 const gdb_byte *m_addr;
5711 mapped_debug_names::namei_to_name (uint32_t namei) const
5713 const ULONGEST namei_string_offs
5714 = extract_unsigned_integer ((name_table_string_offs_reordered
5715 + namei * offset_size),
5718 return read_indirect_string_at_offset
5719 (dwarf2_per_objfile, dwarf2_per_objfile->objfile->obfd, namei_string_offs);
5722 /* Find a slot in .debug_names for the object named NAME. If NAME is
5723 found, return pointer to its pool data. If NAME cannot be found,
5727 dw2_debug_names_iterator::find_vec_in_debug_names
5728 (const mapped_debug_names &map, const char *name)
5730 int (*cmp) (const char *, const char *);
5732 if (current_language->la_language == language_cplus
5733 || current_language->la_language == language_fortran
5734 || current_language->la_language == language_d)
5736 /* NAME is already canonical. Drop any qualifiers as
5737 .debug_names does not contain any. */
5739 if (strchr (name, '(') != NULL)
5741 gdb::unique_xmalloc_ptr<char> without_params
5742 = cp_remove_params (name);
5744 if (without_params != NULL)
5746 name = without_params.get();
5751 cmp = (case_sensitivity == case_sensitive_on ? strcmp : strcasecmp);
5753 const uint32_t full_hash = dwarf5_djb_hash (name);
5755 = extract_unsigned_integer (reinterpret_cast<const gdb_byte *>
5756 (map.bucket_table_reordered
5757 + (full_hash % map.bucket_count)), 4,
5758 map.dwarf5_byte_order);
5762 if (namei >= map.name_count)
5764 complaint (&symfile_complaints,
5765 _("Wrong .debug_names with name index %u but name_count=%u "
5767 namei, map.name_count,
5768 objfile_name (map.dwarf2_per_objfile->objfile));
5774 const uint32_t namei_full_hash
5775 = extract_unsigned_integer (reinterpret_cast<const gdb_byte *>
5776 (map.hash_table_reordered + namei), 4,
5777 map.dwarf5_byte_order);
5778 if (full_hash % map.bucket_count != namei_full_hash % map.bucket_count)
5781 if (full_hash == namei_full_hash)
5783 const char *const namei_string = map.namei_to_name (namei);
5785 #if 0 /* An expensive sanity check. */
5786 if (namei_full_hash != dwarf5_djb_hash (namei_string))
5788 complaint (&symfile_complaints,
5789 _("Wrong .debug_names hash for string at index %u "
5791 namei, objfile_name (dwarf2_per_objfile->objfile));
5796 if (cmp (namei_string, name) == 0)
5798 const ULONGEST namei_entry_offs
5799 = extract_unsigned_integer ((map.name_table_entry_offs_reordered
5800 + namei * map.offset_size),
5801 map.offset_size, map.dwarf5_byte_order);
5802 return map.entry_pool + namei_entry_offs;
5807 if (namei >= map.name_count)
5813 dw2_debug_names_iterator::find_vec_in_debug_names
5814 (const mapped_debug_names &map, uint32_t namei)
5816 if (namei >= map.name_count)
5818 complaint (&symfile_complaints,
5819 _("Wrong .debug_names with name index %u but name_count=%u "
5821 namei, map.name_count,
5822 objfile_name (map.dwarf2_per_objfile->objfile));
5826 const ULONGEST namei_entry_offs
5827 = extract_unsigned_integer ((map.name_table_entry_offs_reordered
5828 + namei * map.offset_size),
5829 map.offset_size, map.dwarf5_byte_order);
5830 return map.entry_pool + namei_entry_offs;
5833 /* See dw2_debug_names_iterator. */
5835 dwarf2_per_cu_data *
5836 dw2_debug_names_iterator::next ()
5841 struct dwarf2_per_objfile *dwarf2_per_objfile = m_map.dwarf2_per_objfile;
5842 struct objfile *objfile = dwarf2_per_objfile->objfile;
5843 bfd *const abfd = objfile->obfd;
5847 unsigned int bytes_read;
5848 const ULONGEST abbrev = read_unsigned_leb128 (abfd, m_addr, &bytes_read);
5849 m_addr += bytes_read;
5853 const auto indexval_it = m_map.abbrev_map.find (abbrev);
5854 if (indexval_it == m_map.abbrev_map.cend ())
5856 complaint (&symfile_complaints,
5857 _("Wrong .debug_names undefined abbrev code %s "
5859 pulongest (abbrev), objfile_name (objfile));
5862 const mapped_debug_names::index_val &indexval = indexval_it->second;
5863 bool have_is_static = false;
5865 dwarf2_per_cu_data *per_cu = NULL;
5866 for (const mapped_debug_names::index_val::attr &attr : indexval.attr_vec)
5871 case DW_FORM_implicit_const:
5872 ull = attr.implicit_const;
5874 case DW_FORM_flag_present:
5878 ull = read_unsigned_leb128 (abfd, m_addr, &bytes_read);
5879 m_addr += bytes_read;
5882 complaint (&symfile_complaints,
5883 _("Unsupported .debug_names form %s [in module %s]"),
5884 dwarf_form_name (attr.form),
5885 objfile_name (objfile));
5888 switch (attr.dw_idx)
5890 case DW_IDX_compile_unit:
5891 /* Don't crash on bad data. */
5892 if (ull >= dwarf2_per_objfile->all_comp_units.size ())
5894 complaint (&symfile_complaints,
5895 _(".debug_names entry has bad CU index %s"
5898 objfile_name (dwarf2_per_objfile->objfile));
5901 per_cu = dwarf2_per_objfile->get_cutu (ull);
5903 case DW_IDX_type_unit:
5904 /* Don't crash on bad data. */
5905 if (ull >= dwarf2_per_objfile->all_type_units.size ())
5907 complaint (&symfile_complaints,
5908 _(".debug_names entry has bad TU index %s"
5911 objfile_name (dwarf2_per_objfile->objfile));
5914 per_cu = &dwarf2_per_objfile->get_tu (ull)->per_cu;
5916 case DW_IDX_GNU_internal:
5917 if (!m_map.augmentation_is_gdb)
5919 have_is_static = true;
5922 case DW_IDX_GNU_external:
5923 if (!m_map.augmentation_is_gdb)
5925 have_is_static = true;
5931 /* Skip if already read in. */
5932 if (per_cu->v.quick->compunit_symtab)
5935 /* Check static vs global. */
5938 const bool want_static = m_block_index != GLOBAL_BLOCK;
5939 if (m_want_specific_block && want_static != is_static)
5943 /* Match dw2_symtab_iter_next, symbol_kind
5944 and debug_names::psymbol_tag. */
5948 switch (indexval.dwarf_tag)
5950 case DW_TAG_variable:
5951 case DW_TAG_subprogram:
5952 /* Some types are also in VAR_DOMAIN. */
5953 case DW_TAG_typedef:
5954 case DW_TAG_structure_type:
5961 switch (indexval.dwarf_tag)
5963 case DW_TAG_typedef:
5964 case DW_TAG_structure_type:
5971 switch (indexval.dwarf_tag)
5974 case DW_TAG_variable:
5984 /* Match dw2_expand_symtabs_matching, symbol_kind and
5985 debug_names::psymbol_tag. */
5988 case VARIABLES_DOMAIN:
5989 switch (indexval.dwarf_tag)
5991 case DW_TAG_variable:
5997 case FUNCTIONS_DOMAIN:
5998 switch (indexval.dwarf_tag)
6000 case DW_TAG_subprogram:
6007 switch (indexval.dwarf_tag)
6009 case DW_TAG_typedef:
6010 case DW_TAG_structure_type:
6023 static struct compunit_symtab *
6024 dw2_debug_names_lookup_symbol (struct objfile *objfile, int block_index_int,
6025 const char *name, domain_enum domain)
6027 const block_enum block_index = static_cast<block_enum> (block_index_int);
6028 struct dwarf2_per_objfile *dwarf2_per_objfile
6029 = get_dwarf2_per_objfile (objfile);
6031 const auto &mapp = dwarf2_per_objfile->debug_names_table;
6034 /* index is NULL if OBJF_READNOW. */
6037 const auto &map = *mapp;
6039 dw2_debug_names_iterator iter (map, true /* want_specific_block */,
6040 block_index, domain, name);
6042 struct compunit_symtab *stab_best = NULL;
6043 struct dwarf2_per_cu_data *per_cu;
6044 while ((per_cu = iter.next ()) != NULL)
6046 struct symbol *sym, *with_opaque = NULL;
6047 struct compunit_symtab *stab = dw2_instantiate_symtab (per_cu, false);
6048 const struct blockvector *bv = COMPUNIT_BLOCKVECTOR (stab);
6049 struct block *block = BLOCKVECTOR_BLOCK (bv, block_index);
6051 sym = block_find_symbol (block, name, domain,
6052 block_find_non_opaque_type_preferred,
6055 /* Some caution must be observed with overloaded functions and
6056 methods, since the index will not contain any overload
6057 information (but NAME might contain it). */
6060 && strcmp_iw (SYMBOL_SEARCH_NAME (sym), name) == 0)
6062 if (with_opaque != NULL
6063 && strcmp_iw (SYMBOL_SEARCH_NAME (with_opaque), name) == 0)
6066 /* Keep looking through other CUs. */
6072 /* This dumps minimal information about .debug_names. It is called
6073 via "mt print objfiles". The gdb.dwarf2/gdb-index.exp testcase
6074 uses this to verify that .debug_names has been loaded. */
6077 dw2_debug_names_dump (struct objfile *objfile)
6079 struct dwarf2_per_objfile *dwarf2_per_objfile
6080 = get_dwarf2_per_objfile (objfile);
6082 gdb_assert (dwarf2_per_objfile->using_index);
6083 printf_filtered (".debug_names:");
6084 if (dwarf2_per_objfile->debug_names_table)
6085 printf_filtered (" exists\n");
6087 printf_filtered (" faked for \"readnow\"\n");
6088 printf_filtered ("\n");
6092 dw2_debug_names_expand_symtabs_for_function (struct objfile *objfile,
6093 const char *func_name)
6095 struct dwarf2_per_objfile *dwarf2_per_objfile
6096 = get_dwarf2_per_objfile (objfile);
6098 /* dwarf2_per_objfile->debug_names_table is NULL if OBJF_READNOW. */
6099 if (dwarf2_per_objfile->debug_names_table)
6101 const mapped_debug_names &map = *dwarf2_per_objfile->debug_names_table;
6103 /* Note: It doesn't matter what we pass for block_index here. */
6104 dw2_debug_names_iterator iter (map, false /* want_specific_block */,
6105 GLOBAL_BLOCK, VAR_DOMAIN, func_name);
6107 struct dwarf2_per_cu_data *per_cu;
6108 while ((per_cu = iter.next ()) != NULL)
6109 dw2_instantiate_symtab (per_cu, false);
6114 dw2_debug_names_expand_symtabs_matching
6115 (struct objfile *objfile,
6116 gdb::function_view<expand_symtabs_file_matcher_ftype> file_matcher,
6117 const lookup_name_info &lookup_name,
6118 gdb::function_view<expand_symtabs_symbol_matcher_ftype> symbol_matcher,
6119 gdb::function_view<expand_symtabs_exp_notify_ftype> expansion_notify,
6120 enum search_domain kind)
6122 struct dwarf2_per_objfile *dwarf2_per_objfile
6123 = get_dwarf2_per_objfile (objfile);
6125 /* debug_names_table is NULL if OBJF_READNOW. */
6126 if (!dwarf2_per_objfile->debug_names_table)
6129 dw_expand_symtabs_matching_file_matcher (dwarf2_per_objfile, file_matcher);
6131 mapped_debug_names &map = *dwarf2_per_objfile->debug_names_table;
6133 dw2_expand_symtabs_matching_symbol (map, lookup_name,
6135 kind, [&] (offset_type namei)
6137 /* The name was matched, now expand corresponding CUs that were
6139 dw2_debug_names_iterator iter (map, kind, namei);
6141 struct dwarf2_per_cu_data *per_cu;
6142 while ((per_cu = iter.next ()) != NULL)
6143 dw2_expand_symtabs_matching_one (per_cu, file_matcher,
6148 const struct quick_symbol_functions dwarf2_debug_names_functions =
6151 dw2_find_last_source_symtab,
6152 dw2_forget_cached_source_info,
6153 dw2_map_symtabs_matching_filename,
6154 dw2_debug_names_lookup_symbol,
6156 dw2_debug_names_dump,
6158 dw2_debug_names_expand_symtabs_for_function,
6159 dw2_expand_all_symtabs,
6160 dw2_expand_symtabs_with_fullname,
6161 dw2_map_matching_symbols,
6162 dw2_debug_names_expand_symtabs_matching,
6163 dw2_find_pc_sect_compunit_symtab,
6165 dw2_map_symbol_filenames
6168 /* See symfile.h. */
6171 dwarf2_initialize_objfile (struct objfile *objfile, dw_index_kind *index_kind)
6173 struct dwarf2_per_objfile *dwarf2_per_objfile
6174 = get_dwarf2_per_objfile (objfile);
6176 /* If we're about to read full symbols, don't bother with the
6177 indices. In this case we also don't care if some other debug
6178 format is making psymtabs, because they are all about to be
6180 if ((objfile->flags & OBJF_READNOW))
6182 dwarf2_per_objfile->using_index = 1;
6183 create_all_comp_units (dwarf2_per_objfile);
6184 create_all_type_units (dwarf2_per_objfile);
6185 dwarf2_per_objfile->quick_file_names_table
6186 = create_quick_file_names_table
6187 (dwarf2_per_objfile->all_comp_units.size ());
6189 for (int i = 0; i < (dwarf2_per_objfile->all_comp_units.size ()
6190 + dwarf2_per_objfile->all_type_units.size ()); ++i)
6192 dwarf2_per_cu_data *per_cu = dwarf2_per_objfile->get_cutu (i);
6194 per_cu->v.quick = OBSTACK_ZALLOC (&objfile->objfile_obstack,
6195 struct dwarf2_per_cu_quick_data);
6198 /* Return 1 so that gdb sees the "quick" functions. However,
6199 these functions will be no-ops because we will have expanded
6201 *index_kind = dw_index_kind::GDB_INDEX;
6205 if (dwarf2_read_debug_names (dwarf2_per_objfile))
6207 *index_kind = dw_index_kind::DEBUG_NAMES;
6211 if (dwarf2_read_index (dwarf2_per_objfile))
6213 *index_kind = dw_index_kind::GDB_INDEX;
6222 /* Build a partial symbol table. */
6225 dwarf2_build_psymtabs (struct objfile *objfile)
6227 struct dwarf2_per_objfile *dwarf2_per_objfile
6228 = get_dwarf2_per_objfile (objfile);
6230 if (objfile->global_psymbols.capacity () == 0
6231 && objfile->static_psymbols.capacity () == 0)
6232 init_psymbol_list (objfile, 1024);
6236 /* This isn't really ideal: all the data we allocate on the
6237 objfile's obstack is still uselessly kept around. However,
6238 freeing it seems unsafe. */
6239 psymtab_discarder psymtabs (objfile);
6240 dwarf2_build_psymtabs_hard (dwarf2_per_objfile);
6243 CATCH (except, RETURN_MASK_ERROR)
6245 exception_print (gdb_stderr, except);
6250 /* Return the total length of the CU described by HEADER. */
6253 get_cu_length (const struct comp_unit_head *header)
6255 return header->initial_length_size + header->length;
6258 /* Return TRUE if SECT_OFF is within CU_HEADER. */
6261 offset_in_cu_p (const comp_unit_head *cu_header, sect_offset sect_off)
6263 sect_offset bottom = cu_header->sect_off;
6264 sect_offset top = cu_header->sect_off + get_cu_length (cu_header);
6266 return sect_off >= bottom && sect_off < top;
6269 /* Find the base address of the compilation unit for range lists and
6270 location lists. It will normally be specified by DW_AT_low_pc.
6271 In DWARF-3 draft 4, the base address could be overridden by
6272 DW_AT_entry_pc. It's been removed, but GCC still uses this for
6273 compilation units with discontinuous ranges. */
6276 dwarf2_find_base_address (struct die_info *die, struct dwarf2_cu *cu)
6278 struct attribute *attr;
6281 cu->base_address = 0;
6283 attr = dwarf2_attr (die, DW_AT_entry_pc, cu);
6286 cu->base_address = attr_value_as_address (attr);
6291 attr = dwarf2_attr (die, DW_AT_low_pc, cu);
6294 cu->base_address = attr_value_as_address (attr);
6300 /* Read in the comp unit header information from the debug_info at info_ptr.
6301 Use rcuh_kind::COMPILE as the default type if not known by the caller.
6302 NOTE: This leaves members offset, first_die_offset to be filled in
6305 static const gdb_byte *
6306 read_comp_unit_head (struct comp_unit_head *cu_header,
6307 const gdb_byte *info_ptr,
6308 struct dwarf2_section_info *section,
6309 rcuh_kind section_kind)
6312 unsigned int bytes_read;
6313 const char *filename = get_section_file_name (section);
6314 bfd *abfd = get_section_bfd_owner (section);
6316 cu_header->length = read_initial_length (abfd, info_ptr, &bytes_read);
6317 cu_header->initial_length_size = bytes_read;
6318 cu_header->offset_size = (bytes_read == 4) ? 4 : 8;
6319 info_ptr += bytes_read;
6320 cu_header->version = read_2_bytes (abfd, info_ptr);
6322 if (cu_header->version < 5)
6323 switch (section_kind)
6325 case rcuh_kind::COMPILE:
6326 cu_header->unit_type = DW_UT_compile;
6328 case rcuh_kind::TYPE:
6329 cu_header->unit_type = DW_UT_type;
6332 internal_error (__FILE__, __LINE__,
6333 _("read_comp_unit_head: invalid section_kind"));
6337 cu_header->unit_type = static_cast<enum dwarf_unit_type>
6338 (read_1_byte (abfd, info_ptr));
6340 switch (cu_header->unit_type)
6343 if (section_kind != rcuh_kind::COMPILE)
6344 error (_("Dwarf Error: wrong unit_type in compilation unit header "
6345 "(is DW_UT_compile, should be DW_UT_type) [in module %s]"),
6349 section_kind = rcuh_kind::TYPE;
6352 error (_("Dwarf Error: wrong unit_type in compilation unit header "
6353 "(is %d, should be %d or %d) [in module %s]"),
6354 cu_header->unit_type, DW_UT_compile, DW_UT_type, filename);
6357 cu_header->addr_size = read_1_byte (abfd, info_ptr);
6360 cu_header->abbrev_sect_off = (sect_offset) read_offset (abfd, info_ptr,
6363 info_ptr += bytes_read;
6364 if (cu_header->version < 5)
6366 cu_header->addr_size = read_1_byte (abfd, info_ptr);
6369 signed_addr = bfd_get_sign_extend_vma (abfd);
6370 if (signed_addr < 0)
6371 internal_error (__FILE__, __LINE__,
6372 _("read_comp_unit_head: dwarf from non elf file"));
6373 cu_header->signed_addr_p = signed_addr;
6375 if (section_kind == rcuh_kind::TYPE)
6377 LONGEST type_offset;
6379 cu_header->signature = read_8_bytes (abfd, info_ptr);
6382 type_offset = read_offset (abfd, info_ptr, cu_header, &bytes_read);
6383 info_ptr += bytes_read;
6384 cu_header->type_cu_offset_in_tu = (cu_offset) type_offset;
6385 if (to_underlying (cu_header->type_cu_offset_in_tu) != type_offset)
6386 error (_("Dwarf Error: Too big type_offset in compilation unit "
6387 "header (is %s) [in module %s]"), plongest (type_offset),
6394 /* Helper function that returns the proper abbrev section for
6397 static struct dwarf2_section_info *
6398 get_abbrev_section_for_cu (struct dwarf2_per_cu_data *this_cu)
6400 struct dwarf2_section_info *abbrev;
6401 struct dwarf2_per_objfile *dwarf2_per_objfile = this_cu->dwarf2_per_objfile;
6403 if (this_cu->is_dwz)
6404 abbrev = &dwarf2_get_dwz_file (dwarf2_per_objfile)->abbrev;
6406 abbrev = &dwarf2_per_objfile->abbrev;
6411 /* Subroutine of read_and_check_comp_unit_head and
6412 read_and_check_type_unit_head to simplify them.
6413 Perform various error checking on the header. */
6416 error_check_comp_unit_head (struct dwarf2_per_objfile *dwarf2_per_objfile,
6417 struct comp_unit_head *header,
6418 struct dwarf2_section_info *section,
6419 struct dwarf2_section_info *abbrev_section)
6421 const char *filename = get_section_file_name (section);
6423 if (header->version < 2 || header->version > 5)
6424 error (_("Dwarf Error: wrong version in compilation unit header "
6425 "(is %d, should be 2, 3, 4 or 5) [in module %s]"), header->version,
6428 if (to_underlying (header->abbrev_sect_off)
6429 >= dwarf2_section_size (dwarf2_per_objfile->objfile, abbrev_section))
6430 error (_("Dwarf Error: bad offset (%s) in compilation unit header "
6431 "(offset %s + 6) [in module %s]"),
6432 sect_offset_str (header->abbrev_sect_off),
6433 sect_offset_str (header->sect_off),
6436 /* Cast to ULONGEST to use 64-bit arithmetic when possible to
6437 avoid potential 32-bit overflow. */
6438 if (((ULONGEST) header->sect_off + get_cu_length (header))
6440 error (_("Dwarf Error: bad length (0x%x) in compilation unit header "
6441 "(offset %s + 0) [in module %s]"),
6442 header->length, sect_offset_str (header->sect_off),
6446 /* Read in a CU/TU header and perform some basic error checking.
6447 The contents of the header are stored in HEADER.
6448 The result is a pointer to the start of the first DIE. */
6450 static const gdb_byte *
6451 read_and_check_comp_unit_head (struct dwarf2_per_objfile *dwarf2_per_objfile,
6452 struct comp_unit_head *header,
6453 struct dwarf2_section_info *section,
6454 struct dwarf2_section_info *abbrev_section,
6455 const gdb_byte *info_ptr,
6456 rcuh_kind section_kind)
6458 const gdb_byte *beg_of_comp_unit = info_ptr;
6460 header->sect_off = (sect_offset) (beg_of_comp_unit - section->buffer);
6462 info_ptr = read_comp_unit_head (header, info_ptr, section, section_kind);
6464 header->first_die_cu_offset = (cu_offset) (info_ptr - beg_of_comp_unit);
6466 error_check_comp_unit_head (dwarf2_per_objfile, header, section,
6472 /* Fetch the abbreviation table offset from a comp or type unit header. */
6475 read_abbrev_offset (struct dwarf2_per_objfile *dwarf2_per_objfile,
6476 struct dwarf2_section_info *section,
6477 sect_offset sect_off)
6479 bfd *abfd = get_section_bfd_owner (section);
6480 const gdb_byte *info_ptr;
6481 unsigned int initial_length_size, offset_size;
6484 dwarf2_read_section (dwarf2_per_objfile->objfile, section);
6485 info_ptr = section->buffer + to_underlying (sect_off);
6486 read_initial_length (abfd, info_ptr, &initial_length_size);
6487 offset_size = initial_length_size == 4 ? 4 : 8;
6488 info_ptr += initial_length_size;
6490 version = read_2_bytes (abfd, info_ptr);
6494 /* Skip unit type and address size. */
6498 return (sect_offset) read_offset_1 (abfd, info_ptr, offset_size);
6501 /* Allocate a new partial symtab for file named NAME and mark this new
6502 partial symtab as being an include of PST. */
6505 dwarf2_create_include_psymtab (const char *name, struct partial_symtab *pst,
6506 struct objfile *objfile)
6508 struct partial_symtab *subpst = allocate_psymtab (name, objfile);
6510 if (!IS_ABSOLUTE_PATH (subpst->filename))
6512 /* It shares objfile->objfile_obstack. */
6513 subpst->dirname = pst->dirname;
6516 subpst->textlow = 0;
6517 subpst->texthigh = 0;
6519 subpst->dependencies
6520 = XOBNEW (&objfile->objfile_obstack, struct partial_symtab *);
6521 subpst->dependencies[0] = pst;
6522 subpst->number_of_dependencies = 1;
6524 subpst->globals_offset = 0;
6525 subpst->n_global_syms = 0;
6526 subpst->statics_offset = 0;
6527 subpst->n_static_syms = 0;
6528 subpst->compunit_symtab = NULL;
6529 subpst->read_symtab = pst->read_symtab;
6532 /* No private part is necessary for include psymtabs. This property
6533 can be used to differentiate between such include psymtabs and
6534 the regular ones. */
6535 subpst->read_symtab_private = NULL;
6538 /* Read the Line Number Program data and extract the list of files
6539 included by the source file represented by PST. Build an include
6540 partial symtab for each of these included files. */
6543 dwarf2_build_include_psymtabs (struct dwarf2_cu *cu,
6544 struct die_info *die,
6545 struct partial_symtab *pst)
6548 struct attribute *attr;
6550 attr = dwarf2_attr (die, DW_AT_stmt_list, cu);
6552 lh = dwarf_decode_line_header ((sect_offset) DW_UNSND (attr), cu);
6554 return; /* No linetable, so no includes. */
6556 /* NOTE: pst->dirname is DW_AT_comp_dir (if present). */
6557 dwarf_decode_lines (lh.get (), pst->dirname, cu, pst, pst->textlow, 1);
6561 hash_signatured_type (const void *item)
6563 const struct signatured_type *sig_type
6564 = (const struct signatured_type *) item;
6566 /* This drops the top 32 bits of the signature, but is ok for a hash. */
6567 return sig_type->signature;
6571 eq_signatured_type (const void *item_lhs, const void *item_rhs)
6573 const struct signatured_type *lhs = (const struct signatured_type *) item_lhs;
6574 const struct signatured_type *rhs = (const struct signatured_type *) item_rhs;
6576 return lhs->signature == rhs->signature;
6579 /* Allocate a hash table for signatured types. */
6582 allocate_signatured_type_table (struct objfile *objfile)
6584 return htab_create_alloc_ex (41,
6585 hash_signatured_type,
6588 &objfile->objfile_obstack,
6589 hashtab_obstack_allocate,
6590 dummy_obstack_deallocate);
6593 /* A helper function to add a signatured type CU to a table. */
6596 add_signatured_type_cu_to_table (void **slot, void *datum)
6598 struct signatured_type *sigt = (struct signatured_type *) *slot;
6599 std::vector<signatured_type *> *all_type_units
6600 = (std::vector<signatured_type *> *) datum;
6602 all_type_units->push_back (sigt);
6607 /* A helper for create_debug_types_hash_table. Read types from SECTION
6608 and fill them into TYPES_HTAB. It will process only type units,
6609 therefore DW_UT_type. */
6612 create_debug_type_hash_table (struct dwarf2_per_objfile *dwarf2_per_objfile,
6613 struct dwo_file *dwo_file,
6614 dwarf2_section_info *section, htab_t &types_htab,
6615 rcuh_kind section_kind)
6617 struct objfile *objfile = dwarf2_per_objfile->objfile;
6618 struct dwarf2_section_info *abbrev_section;
6620 const gdb_byte *info_ptr, *end_ptr;
6622 abbrev_section = (dwo_file != NULL
6623 ? &dwo_file->sections.abbrev
6624 : &dwarf2_per_objfile->abbrev);
6626 if (dwarf_read_debug)
6627 fprintf_unfiltered (gdb_stdlog, "Reading %s for %s:\n",
6628 get_section_name (section),
6629 get_section_file_name (abbrev_section));
6631 dwarf2_read_section (objfile, section);
6632 info_ptr = section->buffer;
6634 if (info_ptr == NULL)
6637 /* We can't set abfd until now because the section may be empty or
6638 not present, in which case the bfd is unknown. */
6639 abfd = get_section_bfd_owner (section);
6641 /* We don't use init_cutu_and_read_dies_simple, or some such, here
6642 because we don't need to read any dies: the signature is in the
6645 end_ptr = info_ptr + section->size;
6646 while (info_ptr < end_ptr)
6648 struct signatured_type *sig_type;
6649 struct dwo_unit *dwo_tu;
6651 const gdb_byte *ptr = info_ptr;
6652 struct comp_unit_head header;
6653 unsigned int length;
6655 sect_offset sect_off = (sect_offset) (ptr - section->buffer);
6657 /* Initialize it due to a false compiler warning. */
6658 header.signature = -1;
6659 header.type_cu_offset_in_tu = (cu_offset) -1;
6661 /* We need to read the type's signature in order to build the hash
6662 table, but we don't need anything else just yet. */
6664 ptr = read_and_check_comp_unit_head (dwarf2_per_objfile, &header, section,
6665 abbrev_section, ptr, section_kind);
6667 length = get_cu_length (&header);
6669 /* Skip dummy type units. */
6670 if (ptr >= info_ptr + length
6671 || peek_abbrev_code (abfd, ptr) == 0
6672 || header.unit_type != DW_UT_type)
6678 if (types_htab == NULL)
6681 types_htab = allocate_dwo_unit_table (objfile);
6683 types_htab = allocate_signatured_type_table (objfile);
6689 dwo_tu = OBSTACK_ZALLOC (&objfile->objfile_obstack,
6691 dwo_tu->dwo_file = dwo_file;
6692 dwo_tu->signature = header.signature;
6693 dwo_tu->type_offset_in_tu = header.type_cu_offset_in_tu;
6694 dwo_tu->section = section;
6695 dwo_tu->sect_off = sect_off;
6696 dwo_tu->length = length;
6700 /* N.B.: type_offset is not usable if this type uses a DWO file.
6701 The real type_offset is in the DWO file. */
6703 sig_type = OBSTACK_ZALLOC (&objfile->objfile_obstack,
6704 struct signatured_type);
6705 sig_type->signature = header.signature;
6706 sig_type->type_offset_in_tu = header.type_cu_offset_in_tu;
6707 sig_type->per_cu.dwarf2_per_objfile = dwarf2_per_objfile;
6708 sig_type->per_cu.is_debug_types = 1;
6709 sig_type->per_cu.section = section;
6710 sig_type->per_cu.sect_off = sect_off;
6711 sig_type->per_cu.length = length;
6714 slot = htab_find_slot (types_htab,
6715 dwo_file ? (void*) dwo_tu : (void *) sig_type,
6717 gdb_assert (slot != NULL);
6720 sect_offset dup_sect_off;
6724 const struct dwo_unit *dup_tu
6725 = (const struct dwo_unit *) *slot;
6727 dup_sect_off = dup_tu->sect_off;
6731 const struct signatured_type *dup_tu
6732 = (const struct signatured_type *) *slot;
6734 dup_sect_off = dup_tu->per_cu.sect_off;
6737 complaint (&symfile_complaints,
6738 _("debug type entry at offset %s is duplicate to"
6739 " the entry at offset %s, signature %s"),
6740 sect_offset_str (sect_off), sect_offset_str (dup_sect_off),
6741 hex_string (header.signature));
6743 *slot = dwo_file ? (void *) dwo_tu : (void *) sig_type;
6745 if (dwarf_read_debug > 1)
6746 fprintf_unfiltered (gdb_stdlog, " offset %s, signature %s\n",
6747 sect_offset_str (sect_off),
6748 hex_string (header.signature));
6754 /* Create the hash table of all entries in the .debug_types
6755 (or .debug_types.dwo) section(s).
6756 If reading a DWO file, then DWO_FILE is a pointer to the DWO file object,
6757 otherwise it is NULL.
6759 The result is a pointer to the hash table or NULL if there are no types.
6761 Note: This function processes DWO files only, not DWP files. */
6764 create_debug_types_hash_table (struct dwarf2_per_objfile *dwarf2_per_objfile,
6765 struct dwo_file *dwo_file,
6766 VEC (dwarf2_section_info_def) *types,
6770 struct dwarf2_section_info *section;
6772 if (VEC_empty (dwarf2_section_info_def, types))
6776 VEC_iterate (dwarf2_section_info_def, types, ix, section);
6778 create_debug_type_hash_table (dwarf2_per_objfile, dwo_file, section,
6779 types_htab, rcuh_kind::TYPE);
6782 /* Create the hash table of all entries in the .debug_types section,
6783 and initialize all_type_units.
6784 The result is zero if there is an error (e.g. missing .debug_types section),
6785 otherwise non-zero. */
6788 create_all_type_units (struct dwarf2_per_objfile *dwarf2_per_objfile)
6790 htab_t types_htab = NULL;
6792 create_debug_type_hash_table (dwarf2_per_objfile, NULL,
6793 &dwarf2_per_objfile->info, types_htab,
6794 rcuh_kind::COMPILE);
6795 create_debug_types_hash_table (dwarf2_per_objfile, NULL,
6796 dwarf2_per_objfile->types, types_htab);
6797 if (types_htab == NULL)
6799 dwarf2_per_objfile->signatured_types = NULL;
6803 dwarf2_per_objfile->signatured_types = types_htab;
6805 gdb_assert (dwarf2_per_objfile->all_type_units.empty ());
6806 dwarf2_per_objfile->all_type_units.reserve (htab_elements (types_htab));
6808 htab_traverse_noresize (types_htab, add_signatured_type_cu_to_table,
6809 &dwarf2_per_objfile->all_type_units);
6814 /* Add an entry for signature SIG to dwarf2_per_objfile->signatured_types.
6815 If SLOT is non-NULL, it is the entry to use in the hash table.
6816 Otherwise we find one. */
6818 static struct signatured_type *
6819 add_type_unit (struct dwarf2_per_objfile *dwarf2_per_objfile, ULONGEST sig,
6822 struct objfile *objfile = dwarf2_per_objfile->objfile;
6824 if (dwarf2_per_objfile->all_type_units.size ()
6825 == dwarf2_per_objfile->all_type_units.capacity ())
6826 ++dwarf2_per_objfile->tu_stats.nr_all_type_units_reallocs;
6828 signatured_type *sig_type = OBSTACK_ZALLOC (&objfile->objfile_obstack,
6829 struct signatured_type);
6831 dwarf2_per_objfile->all_type_units.push_back (sig_type);
6832 sig_type->signature = sig;
6833 sig_type->per_cu.is_debug_types = 1;
6834 if (dwarf2_per_objfile->using_index)
6836 sig_type->per_cu.v.quick =
6837 OBSTACK_ZALLOC (&objfile->objfile_obstack,
6838 struct dwarf2_per_cu_quick_data);
6843 slot = htab_find_slot (dwarf2_per_objfile->signatured_types,
6846 gdb_assert (*slot == NULL);
6848 /* The rest of sig_type must be filled in by the caller. */
6852 /* Subroutine of lookup_dwo_signatured_type and lookup_dwp_signatured_type.
6853 Fill in SIG_ENTRY with DWO_ENTRY. */
6856 fill_in_sig_entry_from_dwo_entry (struct dwarf2_per_objfile *dwarf2_per_objfile,
6857 struct signatured_type *sig_entry,
6858 struct dwo_unit *dwo_entry)
6860 /* Make sure we're not clobbering something we don't expect to. */
6861 gdb_assert (! sig_entry->per_cu.queued);
6862 gdb_assert (sig_entry->per_cu.cu == NULL);
6863 if (dwarf2_per_objfile->using_index)
6865 gdb_assert (sig_entry->per_cu.v.quick != NULL);
6866 gdb_assert (sig_entry->per_cu.v.quick->compunit_symtab == NULL);
6869 gdb_assert (sig_entry->per_cu.v.psymtab == NULL);
6870 gdb_assert (sig_entry->signature == dwo_entry->signature);
6871 gdb_assert (to_underlying (sig_entry->type_offset_in_section) == 0);
6872 gdb_assert (sig_entry->type_unit_group == NULL);
6873 gdb_assert (sig_entry->dwo_unit == NULL);
6875 sig_entry->per_cu.section = dwo_entry->section;
6876 sig_entry->per_cu.sect_off = dwo_entry->sect_off;
6877 sig_entry->per_cu.length = dwo_entry->length;
6878 sig_entry->per_cu.reading_dwo_directly = 1;
6879 sig_entry->per_cu.dwarf2_per_objfile = dwarf2_per_objfile;
6880 sig_entry->type_offset_in_tu = dwo_entry->type_offset_in_tu;
6881 sig_entry->dwo_unit = dwo_entry;
6884 /* Subroutine of lookup_signatured_type.
6885 If we haven't read the TU yet, create the signatured_type data structure
6886 for a TU to be read in directly from a DWO file, bypassing the stub.
6887 This is the "Stay in DWO Optimization": When there is no DWP file and we're
6888 using .gdb_index, then when reading a CU we want to stay in the DWO file
6889 containing that CU. Otherwise we could end up reading several other DWO
6890 files (due to comdat folding) to process the transitive closure of all the
6891 mentioned TUs, and that can be slow. The current DWO file will have every
6892 type signature that it needs.
6893 We only do this for .gdb_index because in the psymtab case we already have
6894 to read all the DWOs to build the type unit groups. */
6896 static struct signatured_type *
6897 lookup_dwo_signatured_type (struct dwarf2_cu *cu, ULONGEST sig)
6899 struct dwarf2_per_objfile *dwarf2_per_objfile
6900 = cu->per_cu->dwarf2_per_objfile;
6901 struct objfile *objfile = dwarf2_per_objfile->objfile;
6902 struct dwo_file *dwo_file;
6903 struct dwo_unit find_dwo_entry, *dwo_entry;
6904 struct signatured_type find_sig_entry, *sig_entry;
6907 gdb_assert (cu->dwo_unit && dwarf2_per_objfile->using_index);
6909 /* If TU skeletons have been removed then we may not have read in any
6911 if (dwarf2_per_objfile->signatured_types == NULL)
6913 dwarf2_per_objfile->signatured_types
6914 = allocate_signatured_type_table (objfile);
6917 /* We only ever need to read in one copy of a signatured type.
6918 Use the global signatured_types array to do our own comdat-folding
6919 of types. If this is the first time we're reading this TU, and
6920 the TU has an entry in .gdb_index, replace the recorded data from
6921 .gdb_index with this TU. */
6923 find_sig_entry.signature = sig;
6924 slot = htab_find_slot (dwarf2_per_objfile->signatured_types,
6925 &find_sig_entry, INSERT);
6926 sig_entry = (struct signatured_type *) *slot;
6928 /* We can get here with the TU already read, *or* in the process of being
6929 read. Don't reassign the global entry to point to this DWO if that's
6930 the case. Also note that if the TU is already being read, it may not
6931 have come from a DWO, the program may be a mix of Fission-compiled
6932 code and non-Fission-compiled code. */
6934 /* Have we already tried to read this TU?
6935 Note: sig_entry can be NULL if the skeleton TU was removed (thus it
6936 needn't exist in the global table yet). */
6937 if (sig_entry != NULL && sig_entry->per_cu.tu_read)
6940 /* Note: cu->dwo_unit is the dwo_unit that references this TU, not the
6941 dwo_unit of the TU itself. */
6942 dwo_file = cu->dwo_unit->dwo_file;
6944 /* Ok, this is the first time we're reading this TU. */
6945 if (dwo_file->tus == NULL)
6947 find_dwo_entry.signature = sig;
6948 dwo_entry = (struct dwo_unit *) htab_find (dwo_file->tus, &find_dwo_entry);
6949 if (dwo_entry == NULL)
6952 /* If the global table doesn't have an entry for this TU, add one. */
6953 if (sig_entry == NULL)
6954 sig_entry = add_type_unit (dwarf2_per_objfile, sig, slot);
6956 fill_in_sig_entry_from_dwo_entry (dwarf2_per_objfile, sig_entry, dwo_entry);
6957 sig_entry->per_cu.tu_read = 1;
6961 /* Subroutine of lookup_signatured_type.
6962 Look up the type for signature SIG, and if we can't find SIG in .gdb_index
6963 then try the DWP file. If the TU stub (skeleton) has been removed then
6964 it won't be in .gdb_index. */
6966 static struct signatured_type *
6967 lookup_dwp_signatured_type (struct dwarf2_cu *cu, ULONGEST sig)
6969 struct dwarf2_per_objfile *dwarf2_per_objfile
6970 = cu->per_cu->dwarf2_per_objfile;
6971 struct objfile *objfile = dwarf2_per_objfile->objfile;
6972 struct dwp_file *dwp_file = get_dwp_file (dwarf2_per_objfile);
6973 struct dwo_unit *dwo_entry;
6974 struct signatured_type find_sig_entry, *sig_entry;
6977 gdb_assert (cu->dwo_unit && dwarf2_per_objfile->using_index);
6978 gdb_assert (dwp_file != NULL);
6980 /* If TU skeletons have been removed then we may not have read in any
6982 if (dwarf2_per_objfile->signatured_types == NULL)
6984 dwarf2_per_objfile->signatured_types
6985 = allocate_signatured_type_table (objfile);
6988 find_sig_entry.signature = sig;
6989 slot = htab_find_slot (dwarf2_per_objfile->signatured_types,
6990 &find_sig_entry, INSERT);
6991 sig_entry = (struct signatured_type *) *slot;
6993 /* Have we already tried to read this TU?
6994 Note: sig_entry can be NULL if the skeleton TU was removed (thus it
6995 needn't exist in the global table yet). */
6996 if (sig_entry != NULL)
6999 if (dwp_file->tus == NULL)
7001 dwo_entry = lookup_dwo_unit_in_dwp (dwarf2_per_objfile, dwp_file, NULL,
7002 sig, 1 /* is_debug_types */);
7003 if (dwo_entry == NULL)
7006 sig_entry = add_type_unit (dwarf2_per_objfile, sig, slot);
7007 fill_in_sig_entry_from_dwo_entry (dwarf2_per_objfile, sig_entry, dwo_entry);
7012 /* Lookup a signature based type for DW_FORM_ref_sig8.
7013 Returns NULL if signature SIG is not present in the table.
7014 It is up to the caller to complain about this. */
7016 static struct signatured_type *
7017 lookup_signatured_type (struct dwarf2_cu *cu, ULONGEST sig)
7019 struct dwarf2_per_objfile *dwarf2_per_objfile
7020 = cu->per_cu->dwarf2_per_objfile;
7023 && dwarf2_per_objfile->using_index)
7025 /* We're in a DWO/DWP file, and we're using .gdb_index.
7026 These cases require special processing. */
7027 if (get_dwp_file (dwarf2_per_objfile) == NULL)
7028 return lookup_dwo_signatured_type (cu, sig);
7030 return lookup_dwp_signatured_type (cu, sig);
7034 struct signatured_type find_entry, *entry;
7036 if (dwarf2_per_objfile->signatured_types == NULL)
7038 find_entry.signature = sig;
7039 entry = ((struct signatured_type *)
7040 htab_find (dwarf2_per_objfile->signatured_types, &find_entry));
7045 /* Low level DIE reading support. */
7047 /* Initialize a die_reader_specs struct from a dwarf2_cu struct. */
7050 init_cu_die_reader (struct die_reader_specs *reader,
7051 struct dwarf2_cu *cu,
7052 struct dwarf2_section_info *section,
7053 struct dwo_file *dwo_file,
7054 struct abbrev_table *abbrev_table)
7056 gdb_assert (section->readin && section->buffer != NULL);
7057 reader->abfd = get_section_bfd_owner (section);
7059 reader->dwo_file = dwo_file;
7060 reader->die_section = section;
7061 reader->buffer = section->buffer;
7062 reader->buffer_end = section->buffer + section->size;
7063 reader->comp_dir = NULL;
7064 reader->abbrev_table = abbrev_table;
7067 /* Subroutine of init_cutu_and_read_dies to simplify it.
7068 Read in the rest of a CU/TU top level DIE from DWO_UNIT.
7069 There's just a lot of work to do, and init_cutu_and_read_dies is big enough
7072 STUB_COMP_UNIT_DIE is for the stub DIE, we copy over certain attributes
7073 from it to the DIE in the DWO. If NULL we are skipping the stub.
7074 STUB_COMP_DIR is similar to STUB_COMP_UNIT_DIE: When reading a TU directly
7075 from the DWO file, bypassing the stub, it contains the DW_AT_comp_dir
7076 attribute of the referencing CU. At most one of STUB_COMP_UNIT_DIE and
7077 STUB_COMP_DIR may be non-NULL.
7078 *RESULT_READER,*RESULT_INFO_PTR,*RESULT_COMP_UNIT_DIE,*RESULT_HAS_CHILDREN
7079 are filled in with the info of the DIE from the DWO file.
7080 *RESULT_DWO_ABBREV_TABLE will be filled in with the abbrev table allocated
7081 from the dwo. Since *RESULT_READER references this abbrev table, it must be
7082 kept around for at least as long as *RESULT_READER.
7084 The result is non-zero if a valid (non-dummy) DIE was found. */
7087 read_cutu_die_from_dwo (struct dwarf2_per_cu_data *this_cu,
7088 struct dwo_unit *dwo_unit,
7089 struct die_info *stub_comp_unit_die,
7090 const char *stub_comp_dir,
7091 struct die_reader_specs *result_reader,
7092 const gdb_byte **result_info_ptr,
7093 struct die_info **result_comp_unit_die,
7094 int *result_has_children,
7095 abbrev_table_up *result_dwo_abbrev_table)
7097 struct dwarf2_per_objfile *dwarf2_per_objfile = this_cu->dwarf2_per_objfile;
7098 struct objfile *objfile = dwarf2_per_objfile->objfile;
7099 struct dwarf2_cu *cu = this_cu->cu;
7101 const gdb_byte *begin_info_ptr, *info_ptr;
7102 struct attribute *comp_dir, *stmt_list, *low_pc, *high_pc, *ranges;
7103 int i,num_extra_attrs;
7104 struct dwarf2_section_info *dwo_abbrev_section;
7105 struct attribute *attr;
7106 struct die_info *comp_unit_die;
7108 /* At most one of these may be provided. */
7109 gdb_assert ((stub_comp_unit_die != NULL) + (stub_comp_dir != NULL) <= 1);
7111 /* These attributes aren't processed until later:
7112 DW_AT_stmt_list, DW_AT_low_pc, DW_AT_high_pc, DW_AT_ranges.
7113 DW_AT_comp_dir is used now, to find the DWO file, but it is also
7114 referenced later. However, these attributes are found in the stub
7115 which we won't have later. In order to not impose this complication
7116 on the rest of the code, we read them here and copy them to the
7125 if (stub_comp_unit_die != NULL)
7127 /* For TUs in DWO files, the DW_AT_stmt_list attribute lives in the
7129 if (! this_cu->is_debug_types)
7130 stmt_list = dwarf2_attr (stub_comp_unit_die, DW_AT_stmt_list, cu);
7131 low_pc = dwarf2_attr (stub_comp_unit_die, DW_AT_low_pc, cu);
7132 high_pc = dwarf2_attr (stub_comp_unit_die, DW_AT_high_pc, cu);
7133 ranges = dwarf2_attr (stub_comp_unit_die, DW_AT_ranges, cu);
7134 comp_dir = dwarf2_attr (stub_comp_unit_die, DW_AT_comp_dir, cu);
7136 /* There should be a DW_AT_addr_base attribute here (if needed).
7137 We need the value before we can process DW_FORM_GNU_addr_index. */
7139 attr = dwarf2_attr (stub_comp_unit_die, DW_AT_GNU_addr_base, cu);
7141 cu->addr_base = DW_UNSND (attr);
7143 /* There should be a DW_AT_ranges_base attribute here (if needed).
7144 We need the value before we can process DW_AT_ranges. */
7145 cu->ranges_base = 0;
7146 attr = dwarf2_attr (stub_comp_unit_die, DW_AT_GNU_ranges_base, cu);
7148 cu->ranges_base = DW_UNSND (attr);
7150 else if (stub_comp_dir != NULL)
7152 /* Reconstruct the comp_dir attribute to simplify the code below. */
7153 comp_dir = XOBNEW (&cu->comp_unit_obstack, struct attribute);
7154 comp_dir->name = DW_AT_comp_dir;
7155 comp_dir->form = DW_FORM_string;
7156 DW_STRING_IS_CANONICAL (comp_dir) = 0;
7157 DW_STRING (comp_dir) = stub_comp_dir;
7160 /* Set up for reading the DWO CU/TU. */
7161 cu->dwo_unit = dwo_unit;
7162 dwarf2_section_info *section = dwo_unit->section;
7163 dwarf2_read_section (objfile, section);
7164 abfd = get_section_bfd_owner (section);
7165 begin_info_ptr = info_ptr = (section->buffer
7166 + to_underlying (dwo_unit->sect_off));
7167 dwo_abbrev_section = &dwo_unit->dwo_file->sections.abbrev;
7169 if (this_cu->is_debug_types)
7171 struct signatured_type *sig_type = (struct signatured_type *) this_cu;
7173 info_ptr = read_and_check_comp_unit_head (dwarf2_per_objfile,
7174 &cu->header, section,
7176 info_ptr, rcuh_kind::TYPE);
7177 /* This is not an assert because it can be caused by bad debug info. */
7178 if (sig_type->signature != cu->header.signature)
7180 error (_("Dwarf Error: signature mismatch %s vs %s while reading"
7181 " TU at offset %s [in module %s]"),
7182 hex_string (sig_type->signature),
7183 hex_string (cu->header.signature),
7184 sect_offset_str (dwo_unit->sect_off),
7185 bfd_get_filename (abfd));
7187 gdb_assert (dwo_unit->sect_off == cu->header.sect_off);
7188 /* For DWOs coming from DWP files, we don't know the CU length
7189 nor the type's offset in the TU until now. */
7190 dwo_unit->length = get_cu_length (&cu->header);
7191 dwo_unit->type_offset_in_tu = cu->header.type_cu_offset_in_tu;
7193 /* Establish the type offset that can be used to lookup the type.
7194 For DWO files, we don't know it until now. */
7195 sig_type->type_offset_in_section
7196 = dwo_unit->sect_off + to_underlying (dwo_unit->type_offset_in_tu);
7200 info_ptr = read_and_check_comp_unit_head (dwarf2_per_objfile,
7201 &cu->header, section,
7203 info_ptr, rcuh_kind::COMPILE);
7204 gdb_assert (dwo_unit->sect_off == cu->header.sect_off);
7205 /* For DWOs coming from DWP files, we don't know the CU length
7207 dwo_unit->length = get_cu_length (&cu->header);
7210 *result_dwo_abbrev_table
7211 = abbrev_table_read_table (dwarf2_per_objfile, dwo_abbrev_section,
7212 cu->header.abbrev_sect_off);
7213 init_cu_die_reader (result_reader, cu, section, dwo_unit->dwo_file,
7214 result_dwo_abbrev_table->get ());
7216 /* Read in the die, but leave space to copy over the attributes
7217 from the stub. This has the benefit of simplifying the rest of
7218 the code - all the work to maintain the illusion of a single
7219 DW_TAG_{compile,type}_unit DIE is done here. */
7220 num_extra_attrs = ((stmt_list != NULL)
7224 + (comp_dir != NULL));
7225 info_ptr = read_full_die_1 (result_reader, result_comp_unit_die, info_ptr,
7226 result_has_children, num_extra_attrs);
7228 /* Copy over the attributes from the stub to the DIE we just read in. */
7229 comp_unit_die = *result_comp_unit_die;
7230 i = comp_unit_die->num_attrs;
7231 if (stmt_list != NULL)
7232 comp_unit_die->attrs[i++] = *stmt_list;
7234 comp_unit_die->attrs[i++] = *low_pc;
7235 if (high_pc != NULL)
7236 comp_unit_die->attrs[i++] = *high_pc;
7238 comp_unit_die->attrs[i++] = *ranges;
7239 if (comp_dir != NULL)
7240 comp_unit_die->attrs[i++] = *comp_dir;
7241 comp_unit_die->num_attrs += num_extra_attrs;
7243 if (dwarf_die_debug)
7245 fprintf_unfiltered (gdb_stdlog,
7246 "Read die from %s@0x%x of %s:\n",
7247 get_section_name (section),
7248 (unsigned) (begin_info_ptr - section->buffer),
7249 bfd_get_filename (abfd));
7250 dump_die (comp_unit_die, dwarf_die_debug);
7253 /* Save the comp_dir attribute. If there is no DWP file then we'll read
7254 TUs by skipping the stub and going directly to the entry in the DWO file.
7255 However, skipping the stub means we won't get DW_AT_comp_dir, so we have
7256 to get it via circuitous means. Blech. */
7257 if (comp_dir != NULL)
7258 result_reader->comp_dir = DW_STRING (comp_dir);
7260 /* Skip dummy compilation units. */
7261 if (info_ptr >= begin_info_ptr + dwo_unit->length
7262 || peek_abbrev_code (abfd, info_ptr) == 0)
7265 *result_info_ptr = info_ptr;
7269 /* Subroutine of init_cutu_and_read_dies to simplify it.
7270 Look up the DWO unit specified by COMP_UNIT_DIE of THIS_CU.
7271 Returns NULL if the specified DWO unit cannot be found. */
7273 static struct dwo_unit *
7274 lookup_dwo_unit (struct dwarf2_per_cu_data *this_cu,
7275 struct die_info *comp_unit_die)
7277 struct dwarf2_cu *cu = this_cu->cu;
7279 struct dwo_unit *dwo_unit;
7280 const char *comp_dir, *dwo_name;
7282 gdb_assert (cu != NULL);
7284 /* Yeah, we look dwo_name up again, but it simplifies the code. */
7285 dwo_name = dwarf2_string_attr (comp_unit_die, DW_AT_GNU_dwo_name, cu);
7286 comp_dir = dwarf2_string_attr (comp_unit_die, DW_AT_comp_dir, cu);
7288 if (this_cu->is_debug_types)
7290 struct signatured_type *sig_type;
7292 /* Since this_cu is the first member of struct signatured_type,
7293 we can go from a pointer to one to a pointer to the other. */
7294 sig_type = (struct signatured_type *) this_cu;
7295 signature = sig_type->signature;
7296 dwo_unit = lookup_dwo_type_unit (sig_type, dwo_name, comp_dir);
7300 struct attribute *attr;
7302 attr = dwarf2_attr (comp_unit_die, DW_AT_GNU_dwo_id, cu);
7304 error (_("Dwarf Error: missing dwo_id for dwo_name %s"
7306 dwo_name, objfile_name (this_cu->dwarf2_per_objfile->objfile));
7307 signature = DW_UNSND (attr);
7308 dwo_unit = lookup_dwo_comp_unit (this_cu, dwo_name, comp_dir,
7315 /* Subroutine of init_cutu_and_read_dies to simplify it.
7316 See it for a description of the parameters.
7317 Read a TU directly from a DWO file, bypassing the stub. */
7320 init_tu_and_read_dwo_dies (struct dwarf2_per_cu_data *this_cu,
7321 int use_existing_cu, int keep,
7322 die_reader_func_ftype *die_reader_func,
7325 std::unique_ptr<dwarf2_cu> new_cu;
7326 struct signatured_type *sig_type;
7327 struct die_reader_specs reader;
7328 const gdb_byte *info_ptr;
7329 struct die_info *comp_unit_die;
7331 struct dwarf2_per_objfile *dwarf2_per_objfile = this_cu->dwarf2_per_objfile;
7333 /* Verify we can do the following downcast, and that we have the
7335 gdb_assert (this_cu->is_debug_types && this_cu->reading_dwo_directly);
7336 sig_type = (struct signatured_type *) this_cu;
7337 gdb_assert (sig_type->dwo_unit != NULL);
7339 if (use_existing_cu && this_cu->cu != NULL)
7341 gdb_assert (this_cu->cu->dwo_unit == sig_type->dwo_unit);
7342 /* There's no need to do the rereading_dwo_cu handling that
7343 init_cutu_and_read_dies does since we don't read the stub. */
7347 /* If !use_existing_cu, this_cu->cu must be NULL. */
7348 gdb_assert (this_cu->cu == NULL);
7349 new_cu.reset (new dwarf2_cu (this_cu));
7352 /* A future optimization, if needed, would be to use an existing
7353 abbrev table. When reading DWOs with skeletonless TUs, all the TUs
7354 could share abbrev tables. */
7356 /* The abbreviation table used by READER, this must live at least as long as
7358 abbrev_table_up dwo_abbrev_table;
7360 if (read_cutu_die_from_dwo (this_cu, sig_type->dwo_unit,
7361 NULL /* stub_comp_unit_die */,
7362 sig_type->dwo_unit->dwo_file->comp_dir,
7364 &comp_unit_die, &has_children,
7365 &dwo_abbrev_table) == 0)
7371 /* All the "real" work is done here. */
7372 die_reader_func (&reader, info_ptr, comp_unit_die, has_children, data);
7374 /* This duplicates the code in init_cutu_and_read_dies,
7375 but the alternative is making the latter more complex.
7376 This function is only for the special case of using DWO files directly:
7377 no point in overly complicating the general case just to handle this. */
7378 if (new_cu != NULL && keep)
7380 /* Link this CU into read_in_chain. */
7381 this_cu->cu->read_in_chain = dwarf2_per_objfile->read_in_chain;
7382 dwarf2_per_objfile->read_in_chain = this_cu;
7383 /* The chain owns it now. */
7388 /* Initialize a CU (or TU) and read its DIEs.
7389 If the CU defers to a DWO file, read the DWO file as well.
7391 ABBREV_TABLE, if non-NULL, is the abbreviation table to use.
7392 Otherwise the table specified in the comp unit header is read in and used.
7393 This is an optimization for when we already have the abbrev table.
7395 If USE_EXISTING_CU is non-zero, and THIS_CU->cu is non-NULL, then use it.
7396 Otherwise, a new CU is allocated with xmalloc.
7398 If KEEP is non-zero, then if we allocated a dwarf2_cu we add it to
7399 read_in_chain. Otherwise the dwarf2_cu data is freed at the end.
7401 WARNING: If THIS_CU is a "dummy CU" (used as filler by the incremental
7402 linker) then DIE_READER_FUNC will not get called. */
7405 init_cutu_and_read_dies (struct dwarf2_per_cu_data *this_cu,
7406 struct abbrev_table *abbrev_table,
7407 int use_existing_cu, int keep,
7409 die_reader_func_ftype *die_reader_func,
7412 struct dwarf2_per_objfile *dwarf2_per_objfile = this_cu->dwarf2_per_objfile;
7413 struct objfile *objfile = dwarf2_per_objfile->objfile;
7414 struct dwarf2_section_info *section = this_cu->section;
7415 bfd *abfd = get_section_bfd_owner (section);
7416 struct dwarf2_cu *cu;
7417 const gdb_byte *begin_info_ptr, *info_ptr;
7418 struct die_reader_specs reader;
7419 struct die_info *comp_unit_die;
7421 struct attribute *attr;
7422 struct signatured_type *sig_type = NULL;
7423 struct dwarf2_section_info *abbrev_section;
7424 /* Non-zero if CU currently points to a DWO file and we need to
7425 reread it. When this happens we need to reread the skeleton die
7426 before we can reread the DWO file (this only applies to CUs, not TUs). */
7427 int rereading_dwo_cu = 0;
7429 if (dwarf_die_debug)
7430 fprintf_unfiltered (gdb_stdlog, "Reading %s unit at offset %s\n",
7431 this_cu->is_debug_types ? "type" : "comp",
7432 sect_offset_str (this_cu->sect_off));
7434 if (use_existing_cu)
7437 /* If we're reading a TU directly from a DWO file, including a virtual DWO
7438 file (instead of going through the stub), short-circuit all of this. */
7439 if (this_cu->reading_dwo_directly)
7441 /* Narrow down the scope of possibilities to have to understand. */
7442 gdb_assert (this_cu->is_debug_types);
7443 gdb_assert (abbrev_table == NULL);
7444 init_tu_and_read_dwo_dies (this_cu, use_existing_cu, keep,
7445 die_reader_func, data);
7449 /* This is cheap if the section is already read in. */
7450 dwarf2_read_section (objfile, section);
7452 begin_info_ptr = info_ptr = section->buffer + to_underlying (this_cu->sect_off);
7454 abbrev_section = get_abbrev_section_for_cu (this_cu);
7456 std::unique_ptr<dwarf2_cu> new_cu;
7457 if (use_existing_cu && this_cu->cu != NULL)
7460 /* If this CU is from a DWO file we need to start over, we need to
7461 refetch the attributes from the skeleton CU.
7462 This could be optimized by retrieving those attributes from when we
7463 were here the first time: the previous comp_unit_die was stored in
7464 comp_unit_obstack. But there's no data yet that we need this
7466 if (cu->dwo_unit != NULL)
7467 rereading_dwo_cu = 1;
7471 /* If !use_existing_cu, this_cu->cu must be NULL. */
7472 gdb_assert (this_cu->cu == NULL);
7473 new_cu.reset (new dwarf2_cu (this_cu));
7477 /* Get the header. */
7478 if (to_underlying (cu->header.first_die_cu_offset) != 0 && !rereading_dwo_cu)
7480 /* We already have the header, there's no need to read it in again. */
7481 info_ptr += to_underlying (cu->header.first_die_cu_offset);
7485 if (this_cu->is_debug_types)
7487 info_ptr = read_and_check_comp_unit_head (dwarf2_per_objfile,
7488 &cu->header, section,
7489 abbrev_section, info_ptr,
7492 /* Since per_cu is the first member of struct signatured_type,
7493 we can go from a pointer to one to a pointer to the other. */
7494 sig_type = (struct signatured_type *) this_cu;
7495 gdb_assert (sig_type->signature == cu->header.signature);
7496 gdb_assert (sig_type->type_offset_in_tu
7497 == cu->header.type_cu_offset_in_tu);
7498 gdb_assert (this_cu->sect_off == cu->header.sect_off);
7500 /* LENGTH has not been set yet for type units if we're
7501 using .gdb_index. */
7502 this_cu->length = get_cu_length (&cu->header);
7504 /* Establish the type offset that can be used to lookup the type. */
7505 sig_type->type_offset_in_section =
7506 this_cu->sect_off + to_underlying (sig_type->type_offset_in_tu);
7508 this_cu->dwarf_version = cu->header.version;
7512 info_ptr = read_and_check_comp_unit_head (dwarf2_per_objfile,
7513 &cu->header, section,
7516 rcuh_kind::COMPILE);
7518 gdb_assert (this_cu->sect_off == cu->header.sect_off);
7519 gdb_assert (this_cu->length == get_cu_length (&cu->header));
7520 this_cu->dwarf_version = cu->header.version;
7524 /* Skip dummy compilation units. */
7525 if (info_ptr >= begin_info_ptr + this_cu->length
7526 || peek_abbrev_code (abfd, info_ptr) == 0)
7529 /* If we don't have them yet, read the abbrevs for this compilation unit.
7530 And if we need to read them now, make sure they're freed when we're
7531 done (own the table through ABBREV_TABLE_HOLDER). */
7532 abbrev_table_up abbrev_table_holder;
7533 if (abbrev_table != NULL)
7534 gdb_assert (cu->header.abbrev_sect_off == abbrev_table->sect_off);
7538 = abbrev_table_read_table (dwarf2_per_objfile, abbrev_section,
7539 cu->header.abbrev_sect_off);
7540 abbrev_table = abbrev_table_holder.get ();
7543 /* Read the top level CU/TU die. */
7544 init_cu_die_reader (&reader, cu, section, NULL, abbrev_table);
7545 info_ptr = read_full_die (&reader, &comp_unit_die, info_ptr, &has_children);
7547 if (skip_partial && comp_unit_die->tag == DW_TAG_partial_unit)
7550 /* If we are in a DWO stub, process it and then read in the "real" CU/TU
7551 from the DWO file. read_cutu_die_from_dwo will allocate the abbreviation
7552 table from the DWO file and pass the ownership over to us. It will be
7553 referenced from READER, so we must make sure to free it after we're done
7556 Note that if USE_EXISTING_OK != 0, and THIS_CU->cu already contains a
7557 DWO CU, that this test will fail (the attribute will not be present). */
7558 attr = dwarf2_attr (comp_unit_die, DW_AT_GNU_dwo_name, cu);
7559 abbrev_table_up dwo_abbrev_table;
7562 struct dwo_unit *dwo_unit;
7563 struct die_info *dwo_comp_unit_die;
7567 complaint (&symfile_complaints,
7568 _("compilation unit with DW_AT_GNU_dwo_name"
7569 " has children (offset %s) [in module %s]"),
7570 sect_offset_str (this_cu->sect_off),
7571 bfd_get_filename (abfd));
7573 dwo_unit = lookup_dwo_unit (this_cu, comp_unit_die);
7574 if (dwo_unit != NULL)
7576 if (read_cutu_die_from_dwo (this_cu, dwo_unit,
7577 comp_unit_die, NULL,
7579 &dwo_comp_unit_die, &has_children,
7580 &dwo_abbrev_table) == 0)
7585 comp_unit_die = dwo_comp_unit_die;
7589 /* Yikes, we couldn't find the rest of the DIE, we only have
7590 the stub. A complaint has already been logged. There's
7591 not much more we can do except pass on the stub DIE to
7592 die_reader_func. We don't want to throw an error on bad
7597 /* All of the above is setup for this call. Yikes. */
7598 die_reader_func (&reader, info_ptr, comp_unit_die, has_children, data);
7600 /* Done, clean up. */
7601 if (new_cu != NULL && keep)
7603 /* Link this CU into read_in_chain. */
7604 this_cu->cu->read_in_chain = dwarf2_per_objfile->read_in_chain;
7605 dwarf2_per_objfile->read_in_chain = this_cu;
7606 /* The chain owns it now. */
7611 /* Read CU/TU THIS_CU but do not follow DW_AT_GNU_dwo_name if present.
7612 DWO_FILE, if non-NULL, is the DWO file to read (the caller is assumed
7613 to have already done the lookup to find the DWO file).
7615 The caller is required to fill in THIS_CU->section, THIS_CU->offset, and
7616 THIS_CU->is_debug_types, but nothing else.
7618 We fill in THIS_CU->length.
7620 WARNING: If THIS_CU is a "dummy CU" (used as filler by the incremental
7621 linker) then DIE_READER_FUNC will not get called.
7623 THIS_CU->cu is always freed when done.
7624 This is done in order to not leave THIS_CU->cu in a state where we have
7625 to care whether it refers to the "main" CU or the DWO CU. */
7628 init_cutu_and_read_dies_no_follow (struct dwarf2_per_cu_data *this_cu,
7629 struct dwo_file *dwo_file,
7630 die_reader_func_ftype *die_reader_func,
7633 struct dwarf2_per_objfile *dwarf2_per_objfile = this_cu->dwarf2_per_objfile;
7634 struct objfile *objfile = dwarf2_per_objfile->objfile;
7635 struct dwarf2_section_info *section = this_cu->section;
7636 bfd *abfd = get_section_bfd_owner (section);
7637 struct dwarf2_section_info *abbrev_section;
7638 const gdb_byte *begin_info_ptr, *info_ptr;
7639 struct die_reader_specs reader;
7640 struct die_info *comp_unit_die;
7643 if (dwarf_die_debug)
7644 fprintf_unfiltered (gdb_stdlog, "Reading %s unit at offset %s\n",
7645 this_cu->is_debug_types ? "type" : "comp",
7646 sect_offset_str (this_cu->sect_off));
7648 gdb_assert (this_cu->cu == NULL);
7650 abbrev_section = (dwo_file != NULL
7651 ? &dwo_file->sections.abbrev
7652 : get_abbrev_section_for_cu (this_cu));
7654 /* This is cheap if the section is already read in. */
7655 dwarf2_read_section (objfile, section);
7657 struct dwarf2_cu cu (this_cu);
7659 begin_info_ptr = info_ptr = section->buffer + to_underlying (this_cu->sect_off);
7660 info_ptr = read_and_check_comp_unit_head (dwarf2_per_objfile,
7661 &cu.header, section,
7662 abbrev_section, info_ptr,
7663 (this_cu->is_debug_types
7665 : rcuh_kind::COMPILE));
7667 this_cu->length = get_cu_length (&cu.header);
7669 /* Skip dummy compilation units. */
7670 if (info_ptr >= begin_info_ptr + this_cu->length
7671 || peek_abbrev_code (abfd, info_ptr) == 0)
7674 abbrev_table_up abbrev_table
7675 = abbrev_table_read_table (dwarf2_per_objfile, abbrev_section,
7676 cu.header.abbrev_sect_off);
7678 init_cu_die_reader (&reader, &cu, section, dwo_file, abbrev_table.get ());
7679 info_ptr = read_full_die (&reader, &comp_unit_die, info_ptr, &has_children);
7681 die_reader_func (&reader, info_ptr, comp_unit_die, has_children, data);
7684 /* Read a CU/TU, except that this does not look for DW_AT_GNU_dwo_name and
7685 does not lookup the specified DWO file.
7686 This cannot be used to read DWO files.
7688 THIS_CU->cu is always freed when done.
7689 This is done in order to not leave THIS_CU->cu in a state where we have
7690 to care whether it refers to the "main" CU or the DWO CU.
7691 We can revisit this if the data shows there's a performance issue. */
7694 init_cutu_and_read_dies_simple (struct dwarf2_per_cu_data *this_cu,
7695 die_reader_func_ftype *die_reader_func,
7698 init_cutu_and_read_dies_no_follow (this_cu, NULL, die_reader_func, data);
7701 /* Type Unit Groups.
7703 Type Unit Groups are a way to collapse the set of all TUs (type units) into
7704 a more manageable set. The grouping is done by DW_AT_stmt_list entry
7705 so that all types coming from the same compilation (.o file) are grouped
7706 together. A future step could be to put the types in the same symtab as
7707 the CU the types ultimately came from. */
7710 hash_type_unit_group (const void *item)
7712 const struct type_unit_group *tu_group
7713 = (const struct type_unit_group *) item;
7715 return hash_stmt_list_entry (&tu_group->hash);
7719 eq_type_unit_group (const void *item_lhs, const void *item_rhs)
7721 const struct type_unit_group *lhs = (const struct type_unit_group *) item_lhs;
7722 const struct type_unit_group *rhs = (const struct type_unit_group *) item_rhs;
7724 return eq_stmt_list_entry (&lhs->hash, &rhs->hash);
7727 /* Allocate a hash table for type unit groups. */
7730 allocate_type_unit_groups_table (struct objfile *objfile)
7732 return htab_create_alloc_ex (3,
7733 hash_type_unit_group,
7736 &objfile->objfile_obstack,
7737 hashtab_obstack_allocate,
7738 dummy_obstack_deallocate);
7741 /* Type units that don't have DW_AT_stmt_list are grouped into their own
7742 partial symtabs. We combine several TUs per psymtab to not let the size
7743 of any one psymtab grow too big. */
7744 #define NO_STMT_LIST_TYPE_UNIT_PSYMTAB (1 << 31)
7745 #define NO_STMT_LIST_TYPE_UNIT_PSYMTAB_SIZE 10
7747 /* Helper routine for get_type_unit_group.
7748 Create the type_unit_group object used to hold one or more TUs. */
7750 static struct type_unit_group *
7751 create_type_unit_group (struct dwarf2_cu *cu, sect_offset line_offset_struct)
7753 struct dwarf2_per_objfile *dwarf2_per_objfile
7754 = cu->per_cu->dwarf2_per_objfile;
7755 struct objfile *objfile = dwarf2_per_objfile->objfile;
7756 struct dwarf2_per_cu_data *per_cu;
7757 struct type_unit_group *tu_group;
7759 tu_group = OBSTACK_ZALLOC (&objfile->objfile_obstack,
7760 struct type_unit_group);
7761 per_cu = &tu_group->per_cu;
7762 per_cu->dwarf2_per_objfile = dwarf2_per_objfile;
7764 if (dwarf2_per_objfile->using_index)
7766 per_cu->v.quick = OBSTACK_ZALLOC (&objfile->objfile_obstack,
7767 struct dwarf2_per_cu_quick_data);
7771 unsigned int line_offset = to_underlying (line_offset_struct);
7772 struct partial_symtab *pst;
7775 /* Give the symtab a useful name for debug purposes. */
7776 if ((line_offset & NO_STMT_LIST_TYPE_UNIT_PSYMTAB) != 0)
7777 name = xstrprintf ("<type_units_%d>",
7778 (line_offset & ~NO_STMT_LIST_TYPE_UNIT_PSYMTAB));
7780 name = xstrprintf ("<type_units_at_0x%x>", line_offset);
7782 pst = create_partial_symtab (per_cu, name);
7788 tu_group->hash.dwo_unit = cu->dwo_unit;
7789 tu_group->hash.line_sect_off = line_offset_struct;
7794 /* Look up the type_unit_group for type unit CU, and create it if necessary.
7795 STMT_LIST is a DW_AT_stmt_list attribute. */
7797 static struct type_unit_group *
7798 get_type_unit_group (struct dwarf2_cu *cu, const struct attribute *stmt_list)
7800 struct dwarf2_per_objfile *dwarf2_per_objfile
7801 = cu->per_cu->dwarf2_per_objfile;
7802 struct tu_stats *tu_stats = &dwarf2_per_objfile->tu_stats;
7803 struct type_unit_group *tu_group;
7805 unsigned int line_offset;
7806 struct type_unit_group type_unit_group_for_lookup;
7808 if (dwarf2_per_objfile->type_unit_groups == NULL)
7810 dwarf2_per_objfile->type_unit_groups =
7811 allocate_type_unit_groups_table (dwarf2_per_objfile->objfile);
7814 /* Do we need to create a new group, or can we use an existing one? */
7818 line_offset = DW_UNSND (stmt_list);
7819 ++tu_stats->nr_symtab_sharers;
7823 /* Ugh, no stmt_list. Rare, but we have to handle it.
7824 We can do various things here like create one group per TU or
7825 spread them over multiple groups to split up the expansion work.
7826 To avoid worst case scenarios (too many groups or too large groups)
7827 we, umm, group them in bunches. */
7828 line_offset = (NO_STMT_LIST_TYPE_UNIT_PSYMTAB
7829 | (tu_stats->nr_stmt_less_type_units
7830 / NO_STMT_LIST_TYPE_UNIT_PSYMTAB_SIZE));
7831 ++tu_stats->nr_stmt_less_type_units;
7834 type_unit_group_for_lookup.hash.dwo_unit = cu->dwo_unit;
7835 type_unit_group_for_lookup.hash.line_sect_off = (sect_offset) line_offset;
7836 slot = htab_find_slot (dwarf2_per_objfile->type_unit_groups,
7837 &type_unit_group_for_lookup, INSERT);
7840 tu_group = (struct type_unit_group *) *slot;
7841 gdb_assert (tu_group != NULL);
7845 sect_offset line_offset_struct = (sect_offset) line_offset;
7846 tu_group = create_type_unit_group (cu, line_offset_struct);
7848 ++tu_stats->nr_symtabs;
7854 /* Partial symbol tables. */
7856 /* Create a psymtab named NAME and assign it to PER_CU.
7858 The caller must fill in the following details:
7859 dirname, textlow, texthigh. */
7861 static struct partial_symtab *
7862 create_partial_symtab (struct dwarf2_per_cu_data *per_cu, const char *name)
7864 struct objfile *objfile = per_cu->dwarf2_per_objfile->objfile;
7865 struct partial_symtab *pst;
7867 pst = start_psymtab_common (objfile, name, 0,
7868 objfile->global_psymbols,
7869 objfile->static_psymbols);
7871 pst->psymtabs_addrmap_supported = 1;
7873 /* This is the glue that links PST into GDB's symbol API. */
7874 pst->read_symtab_private = per_cu;
7875 pst->read_symtab = dwarf2_read_symtab;
7876 per_cu->v.psymtab = pst;
7881 /* The DATA object passed to process_psymtab_comp_unit_reader has this
7884 struct process_psymtab_comp_unit_data
7886 /* True if we are reading a DW_TAG_partial_unit. */
7888 int want_partial_unit;
7890 /* The "pretend" language that is used if the CU doesn't declare a
7893 enum language pretend_language;
7896 /* die_reader_func for process_psymtab_comp_unit. */
7899 process_psymtab_comp_unit_reader (const struct die_reader_specs *reader,
7900 const gdb_byte *info_ptr,
7901 struct die_info *comp_unit_die,
7905 struct dwarf2_cu *cu = reader->cu;
7906 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
7907 struct gdbarch *gdbarch = get_objfile_arch (objfile);
7908 struct dwarf2_per_cu_data *per_cu = cu->per_cu;
7910 CORE_ADDR best_lowpc = 0, best_highpc = 0;
7911 struct partial_symtab *pst;
7912 enum pc_bounds_kind cu_bounds_kind;
7913 const char *filename;
7914 struct process_psymtab_comp_unit_data *info
7915 = (struct process_psymtab_comp_unit_data *) data;
7917 if (comp_unit_die->tag == DW_TAG_partial_unit && !info->want_partial_unit)
7920 gdb_assert (! per_cu->is_debug_types);
7922 prepare_one_comp_unit (cu, comp_unit_die, info->pretend_language);
7924 cu->list_in_scope = &file_symbols;
7926 /* Allocate a new partial symbol table structure. */
7927 filename = dwarf2_string_attr (comp_unit_die, DW_AT_name, cu);
7928 if (filename == NULL)
7931 pst = create_partial_symtab (per_cu, filename);
7933 /* This must be done before calling dwarf2_build_include_psymtabs. */
7934 pst->dirname = dwarf2_string_attr (comp_unit_die, DW_AT_comp_dir, cu);
7936 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
7938 dwarf2_find_base_address (comp_unit_die, cu);
7940 /* Possibly set the default values of LOWPC and HIGHPC from
7942 cu_bounds_kind = dwarf2_get_pc_bounds (comp_unit_die, &best_lowpc,
7943 &best_highpc, cu, pst);
7944 if (cu_bounds_kind == PC_BOUNDS_HIGH_LOW && best_lowpc < best_highpc)
7945 /* Store the contiguous range if it is not empty; it can be empty for
7946 CUs with no code. */
7947 addrmap_set_empty (objfile->psymtabs_addrmap,
7948 gdbarch_adjust_dwarf2_addr (gdbarch,
7949 best_lowpc + baseaddr),
7950 gdbarch_adjust_dwarf2_addr (gdbarch,
7951 best_highpc + baseaddr) - 1,
7954 /* Check if comp unit has_children.
7955 If so, read the rest of the partial symbols from this comp unit.
7956 If not, there's no more debug_info for this comp unit. */
7959 struct partial_die_info *first_die;
7960 CORE_ADDR lowpc, highpc;
7962 lowpc = ((CORE_ADDR) -1);
7963 highpc = ((CORE_ADDR) 0);
7965 first_die = load_partial_dies (reader, info_ptr, 1);
7967 scan_partial_symbols (first_die, &lowpc, &highpc,
7968 cu_bounds_kind <= PC_BOUNDS_INVALID, cu);
7970 /* If we didn't find a lowpc, set it to highpc to avoid
7971 complaints from `maint check'. */
7972 if (lowpc == ((CORE_ADDR) -1))
7975 /* If the compilation unit didn't have an explicit address range,
7976 then use the information extracted from its child dies. */
7977 if (cu_bounds_kind <= PC_BOUNDS_INVALID)
7980 best_highpc = highpc;
7983 pst->textlow = gdbarch_adjust_dwarf2_addr (gdbarch, best_lowpc + baseaddr);
7984 pst->texthigh = gdbarch_adjust_dwarf2_addr (gdbarch, best_highpc + baseaddr);
7986 end_psymtab_common (objfile, pst);
7988 if (!VEC_empty (dwarf2_per_cu_ptr, cu->per_cu->imported_symtabs))
7991 int len = VEC_length (dwarf2_per_cu_ptr, cu->per_cu->imported_symtabs);
7992 struct dwarf2_per_cu_data *iter;
7994 /* Fill in 'dependencies' here; we fill in 'users' in a
7996 pst->number_of_dependencies = len;
7998 XOBNEWVEC (&objfile->objfile_obstack, struct partial_symtab *, len);
8000 VEC_iterate (dwarf2_per_cu_ptr, cu->per_cu->imported_symtabs,
8003 pst->dependencies[i] = iter->v.psymtab;
8005 VEC_free (dwarf2_per_cu_ptr, cu->per_cu->imported_symtabs);
8008 /* Get the list of files included in the current compilation unit,
8009 and build a psymtab for each of them. */
8010 dwarf2_build_include_psymtabs (cu, comp_unit_die, pst);
8012 if (dwarf_read_debug)
8014 struct gdbarch *gdbarch = get_objfile_arch (objfile);
8016 fprintf_unfiltered (gdb_stdlog,
8017 "Psymtab for %s unit @%s: %s - %s"
8018 ", %d global, %d static syms\n",
8019 per_cu->is_debug_types ? "type" : "comp",
8020 sect_offset_str (per_cu->sect_off),
8021 paddress (gdbarch, pst->textlow),
8022 paddress (gdbarch, pst->texthigh),
8023 pst->n_global_syms, pst->n_static_syms);
8027 /* Subroutine of dwarf2_build_psymtabs_hard to simplify it.
8028 Process compilation unit THIS_CU for a psymtab. */
8031 process_psymtab_comp_unit (struct dwarf2_per_cu_data *this_cu,
8032 int want_partial_unit,
8033 enum language pretend_language)
8035 /* If this compilation unit was already read in, free the
8036 cached copy in order to read it in again. This is
8037 necessary because we skipped some symbols when we first
8038 read in the compilation unit (see load_partial_dies).
8039 This problem could be avoided, but the benefit is unclear. */
8040 if (this_cu->cu != NULL)
8041 free_one_cached_comp_unit (this_cu);
8043 if (this_cu->is_debug_types)
8044 init_cutu_and_read_dies (this_cu, NULL, 0, 0, false,
8045 build_type_psymtabs_reader, NULL);
8048 process_psymtab_comp_unit_data info;
8049 info.want_partial_unit = want_partial_unit;
8050 info.pretend_language = pretend_language;
8051 init_cutu_and_read_dies (this_cu, NULL, 0, 0, false,
8052 process_psymtab_comp_unit_reader, &info);
8055 /* Age out any secondary CUs. */
8056 age_cached_comp_units (this_cu->dwarf2_per_objfile);
8059 /* Reader function for build_type_psymtabs. */
8062 build_type_psymtabs_reader (const struct die_reader_specs *reader,
8063 const gdb_byte *info_ptr,
8064 struct die_info *type_unit_die,
8068 struct dwarf2_per_objfile *dwarf2_per_objfile
8069 = reader->cu->per_cu->dwarf2_per_objfile;
8070 struct objfile *objfile = dwarf2_per_objfile->objfile;
8071 struct dwarf2_cu *cu = reader->cu;
8072 struct dwarf2_per_cu_data *per_cu = cu->per_cu;
8073 struct signatured_type *sig_type;
8074 struct type_unit_group *tu_group;
8075 struct attribute *attr;
8076 struct partial_die_info *first_die;
8077 CORE_ADDR lowpc, highpc;
8078 struct partial_symtab *pst;
8080 gdb_assert (data == NULL);
8081 gdb_assert (per_cu->is_debug_types);
8082 sig_type = (struct signatured_type *) per_cu;
8087 attr = dwarf2_attr_no_follow (type_unit_die, DW_AT_stmt_list);
8088 tu_group = get_type_unit_group (cu, attr);
8090 VEC_safe_push (sig_type_ptr, tu_group->tus, sig_type);
8092 prepare_one_comp_unit (cu, type_unit_die, language_minimal);
8093 cu->list_in_scope = &file_symbols;
8094 pst = create_partial_symtab (per_cu, "");
8097 first_die = load_partial_dies (reader, info_ptr, 1);
8099 lowpc = (CORE_ADDR) -1;
8100 highpc = (CORE_ADDR) 0;
8101 scan_partial_symbols (first_die, &lowpc, &highpc, 0, cu);
8103 end_psymtab_common (objfile, pst);
8106 /* Struct used to sort TUs by their abbreviation table offset. */
8108 struct tu_abbrev_offset
8110 tu_abbrev_offset (signatured_type *sig_type_, sect_offset abbrev_offset_)
8111 : sig_type (sig_type_), abbrev_offset (abbrev_offset_)
8114 signatured_type *sig_type;
8115 sect_offset abbrev_offset;
8118 /* Helper routine for build_type_psymtabs_1, passed to std::sort. */
8121 sort_tu_by_abbrev_offset (const struct tu_abbrev_offset &a,
8122 const struct tu_abbrev_offset &b)
8124 return a.abbrev_offset < b.abbrev_offset;
8127 /* Efficiently read all the type units.
8128 This does the bulk of the work for build_type_psymtabs.
8130 The efficiency is because we sort TUs by the abbrev table they use and
8131 only read each abbrev table once. In one program there are 200K TUs
8132 sharing 8K abbrev tables.
8134 The main purpose of this function is to support building the
8135 dwarf2_per_objfile->type_unit_groups table.
8136 TUs typically share the DW_AT_stmt_list of the CU they came from, so we
8137 can collapse the search space by grouping them by stmt_list.
8138 The savings can be significant, in the same program from above the 200K TUs
8139 share 8K stmt_list tables.
8141 FUNC is expected to call get_type_unit_group, which will create the
8142 struct type_unit_group if necessary and add it to
8143 dwarf2_per_objfile->type_unit_groups. */
8146 build_type_psymtabs_1 (struct dwarf2_per_objfile *dwarf2_per_objfile)
8148 struct tu_stats *tu_stats = &dwarf2_per_objfile->tu_stats;
8149 abbrev_table_up abbrev_table;
8150 sect_offset abbrev_offset;
8152 /* It's up to the caller to not call us multiple times. */
8153 gdb_assert (dwarf2_per_objfile->type_unit_groups == NULL);
8155 if (dwarf2_per_objfile->all_type_units.empty ())
8158 /* TUs typically share abbrev tables, and there can be way more TUs than
8159 abbrev tables. Sort by abbrev table to reduce the number of times we
8160 read each abbrev table in.
8161 Alternatives are to punt or to maintain a cache of abbrev tables.
8162 This is simpler and efficient enough for now.
8164 Later we group TUs by their DW_AT_stmt_list value (as this defines the
8165 symtab to use). Typically TUs with the same abbrev offset have the same
8166 stmt_list value too so in practice this should work well.
8168 The basic algorithm here is:
8170 sort TUs by abbrev table
8171 for each TU with same abbrev table:
8172 read abbrev table if first user
8173 read TU top level DIE
8174 [IWBN if DWO skeletons had DW_AT_stmt_list]
8177 if (dwarf_read_debug)
8178 fprintf_unfiltered (gdb_stdlog, "Building type unit groups ...\n");
8180 /* Sort in a separate table to maintain the order of all_type_units
8181 for .gdb_index: TU indices directly index all_type_units. */
8182 std::vector<tu_abbrev_offset> sorted_by_abbrev;
8183 sorted_by_abbrev.reserve (dwarf2_per_objfile->all_type_units.size ());
8185 for (signatured_type *sig_type : dwarf2_per_objfile->all_type_units)
8186 sorted_by_abbrev.emplace_back
8187 (sig_type, read_abbrev_offset (dwarf2_per_objfile,
8188 sig_type->per_cu.section,
8189 sig_type->per_cu.sect_off));
8191 std::sort (sorted_by_abbrev.begin (), sorted_by_abbrev.end (),
8192 sort_tu_by_abbrev_offset);
8194 abbrev_offset = (sect_offset) ~(unsigned) 0;
8196 for (const tu_abbrev_offset &tu : sorted_by_abbrev)
8198 /* Switch to the next abbrev table if necessary. */
8199 if (abbrev_table == NULL
8200 || tu.abbrev_offset != abbrev_offset)
8202 abbrev_offset = tu.abbrev_offset;
8204 abbrev_table_read_table (dwarf2_per_objfile,
8205 &dwarf2_per_objfile->abbrev,
8207 ++tu_stats->nr_uniq_abbrev_tables;
8210 init_cutu_and_read_dies (&tu.sig_type->per_cu, abbrev_table.get (),
8211 0, 0, false, build_type_psymtabs_reader, NULL);
8215 /* Print collected type unit statistics. */
8218 print_tu_stats (struct dwarf2_per_objfile *dwarf2_per_objfile)
8220 struct tu_stats *tu_stats = &dwarf2_per_objfile->tu_stats;
8222 fprintf_unfiltered (gdb_stdlog, "Type unit statistics:\n");
8223 fprintf_unfiltered (gdb_stdlog, " %zu TUs\n",
8224 dwarf2_per_objfile->all_type_units.size ());
8225 fprintf_unfiltered (gdb_stdlog, " %d uniq abbrev tables\n",
8226 tu_stats->nr_uniq_abbrev_tables);
8227 fprintf_unfiltered (gdb_stdlog, " %d symtabs from stmt_list entries\n",
8228 tu_stats->nr_symtabs);
8229 fprintf_unfiltered (gdb_stdlog, " %d symtab sharers\n",
8230 tu_stats->nr_symtab_sharers);
8231 fprintf_unfiltered (gdb_stdlog, " %d type units without a stmt_list\n",
8232 tu_stats->nr_stmt_less_type_units);
8233 fprintf_unfiltered (gdb_stdlog, " %d all_type_units reallocs\n",
8234 tu_stats->nr_all_type_units_reallocs);
8237 /* Traversal function for build_type_psymtabs. */
8240 build_type_psymtab_dependencies (void **slot, void *info)
8242 struct dwarf2_per_objfile *dwarf2_per_objfile
8243 = (struct dwarf2_per_objfile *) info;
8244 struct objfile *objfile = dwarf2_per_objfile->objfile;
8245 struct type_unit_group *tu_group = (struct type_unit_group *) *slot;
8246 struct dwarf2_per_cu_data *per_cu = &tu_group->per_cu;
8247 struct partial_symtab *pst = per_cu->v.psymtab;
8248 int len = VEC_length (sig_type_ptr, tu_group->tus);
8249 struct signatured_type *iter;
8252 gdb_assert (len > 0);
8253 gdb_assert (IS_TYPE_UNIT_GROUP (per_cu));
8255 pst->number_of_dependencies = len;
8257 XOBNEWVEC (&objfile->objfile_obstack, struct partial_symtab *, len);
8259 VEC_iterate (sig_type_ptr, tu_group->tus, i, iter);
8262 gdb_assert (iter->per_cu.is_debug_types);
8263 pst->dependencies[i] = iter->per_cu.v.psymtab;
8264 iter->type_unit_group = tu_group;
8267 VEC_free (sig_type_ptr, tu_group->tus);
8272 /* Subroutine of dwarf2_build_psymtabs_hard to simplify it.
8273 Build partial symbol tables for the .debug_types comp-units. */
8276 build_type_psymtabs (struct dwarf2_per_objfile *dwarf2_per_objfile)
8278 if (! create_all_type_units (dwarf2_per_objfile))
8281 build_type_psymtabs_1 (dwarf2_per_objfile);
8284 /* Traversal function for process_skeletonless_type_unit.
8285 Read a TU in a DWO file and build partial symbols for it. */
8288 process_skeletonless_type_unit (void **slot, void *info)
8290 struct dwo_unit *dwo_unit = (struct dwo_unit *) *slot;
8291 struct dwarf2_per_objfile *dwarf2_per_objfile
8292 = (struct dwarf2_per_objfile *) info;
8293 struct signatured_type find_entry, *entry;
8295 /* If this TU doesn't exist in the global table, add it and read it in. */
8297 if (dwarf2_per_objfile->signatured_types == NULL)
8299 dwarf2_per_objfile->signatured_types
8300 = allocate_signatured_type_table (dwarf2_per_objfile->objfile);
8303 find_entry.signature = dwo_unit->signature;
8304 slot = htab_find_slot (dwarf2_per_objfile->signatured_types, &find_entry,
8306 /* If we've already seen this type there's nothing to do. What's happening
8307 is we're doing our own version of comdat-folding here. */
8311 /* This does the job that create_all_type_units would have done for
8313 entry = add_type_unit (dwarf2_per_objfile, dwo_unit->signature, slot);
8314 fill_in_sig_entry_from_dwo_entry (dwarf2_per_objfile, entry, dwo_unit);
8317 /* This does the job that build_type_psymtabs_1 would have done. */
8318 init_cutu_and_read_dies (&entry->per_cu, NULL, 0, 0, false,
8319 build_type_psymtabs_reader, NULL);
8324 /* Traversal function for process_skeletonless_type_units. */
8327 process_dwo_file_for_skeletonless_type_units (void **slot, void *info)
8329 struct dwo_file *dwo_file = (struct dwo_file *) *slot;
8331 if (dwo_file->tus != NULL)
8333 htab_traverse_noresize (dwo_file->tus,
8334 process_skeletonless_type_unit, info);
8340 /* Scan all TUs of DWO files, verifying we've processed them.
8341 This is needed in case a TU was emitted without its skeleton.
8342 Note: This can't be done until we know what all the DWO files are. */
8345 process_skeletonless_type_units (struct dwarf2_per_objfile *dwarf2_per_objfile)
8347 /* Skeletonless TUs in DWP files without .gdb_index is not supported yet. */
8348 if (get_dwp_file (dwarf2_per_objfile) == NULL
8349 && dwarf2_per_objfile->dwo_files != NULL)
8351 htab_traverse_noresize (dwarf2_per_objfile->dwo_files,
8352 process_dwo_file_for_skeletonless_type_units,
8353 dwarf2_per_objfile);
8357 /* Compute the 'user' field for each psymtab in DWARF2_PER_OBJFILE. */
8360 set_partial_user (struct dwarf2_per_objfile *dwarf2_per_objfile)
8362 for (dwarf2_per_cu_data *per_cu : dwarf2_per_objfile->all_comp_units)
8364 struct partial_symtab *pst = per_cu->v.psymtab;
8369 for (int j = 0; j < pst->number_of_dependencies; ++j)
8371 /* Set the 'user' field only if it is not already set. */
8372 if (pst->dependencies[j]->user == NULL)
8373 pst->dependencies[j]->user = pst;
8378 /* Build the partial symbol table by doing a quick pass through the
8379 .debug_info and .debug_abbrev sections. */
8382 dwarf2_build_psymtabs_hard (struct dwarf2_per_objfile *dwarf2_per_objfile)
8384 struct objfile *objfile = dwarf2_per_objfile->objfile;
8386 if (dwarf_read_debug)
8388 fprintf_unfiltered (gdb_stdlog, "Building psymtabs of objfile %s ...\n",
8389 objfile_name (objfile));
8392 dwarf2_per_objfile->reading_partial_symbols = 1;
8394 dwarf2_read_section (objfile, &dwarf2_per_objfile->info);
8396 /* Any cached compilation units will be linked by the per-objfile
8397 read_in_chain. Make sure to free them when we're done. */
8398 free_cached_comp_units freer (dwarf2_per_objfile);
8400 build_type_psymtabs (dwarf2_per_objfile);
8402 create_all_comp_units (dwarf2_per_objfile);
8404 /* Create a temporary address map on a temporary obstack. We later
8405 copy this to the final obstack. */
8406 auto_obstack temp_obstack;
8408 scoped_restore save_psymtabs_addrmap
8409 = make_scoped_restore (&objfile->psymtabs_addrmap,
8410 addrmap_create_mutable (&temp_obstack));
8412 for (dwarf2_per_cu_data *per_cu : dwarf2_per_objfile->all_comp_units)
8413 process_psymtab_comp_unit (per_cu, 0, language_minimal);
8415 /* This has to wait until we read the CUs, we need the list of DWOs. */
8416 process_skeletonless_type_units (dwarf2_per_objfile);
8418 /* Now that all TUs have been processed we can fill in the dependencies. */
8419 if (dwarf2_per_objfile->type_unit_groups != NULL)
8421 htab_traverse_noresize (dwarf2_per_objfile->type_unit_groups,
8422 build_type_psymtab_dependencies, dwarf2_per_objfile);
8425 if (dwarf_read_debug)
8426 print_tu_stats (dwarf2_per_objfile);
8428 set_partial_user (dwarf2_per_objfile);
8430 objfile->psymtabs_addrmap = addrmap_create_fixed (objfile->psymtabs_addrmap,
8431 &objfile->objfile_obstack);
8432 /* At this point we want to keep the address map. */
8433 save_psymtabs_addrmap.release ();
8435 if (dwarf_read_debug)
8436 fprintf_unfiltered (gdb_stdlog, "Done building psymtabs of %s\n",
8437 objfile_name (objfile));
8440 /* die_reader_func for load_partial_comp_unit. */
8443 load_partial_comp_unit_reader (const struct die_reader_specs *reader,
8444 const gdb_byte *info_ptr,
8445 struct die_info *comp_unit_die,
8449 struct dwarf2_cu *cu = reader->cu;
8451 prepare_one_comp_unit (cu, comp_unit_die, language_minimal);
8453 /* Check if comp unit has_children.
8454 If so, read the rest of the partial symbols from this comp unit.
8455 If not, there's no more debug_info for this comp unit. */
8457 load_partial_dies (reader, info_ptr, 0);
8460 /* Load the partial DIEs for a secondary CU into memory.
8461 This is also used when rereading a primary CU with load_all_dies. */
8464 load_partial_comp_unit (struct dwarf2_per_cu_data *this_cu)
8466 init_cutu_and_read_dies (this_cu, NULL, 1, 1, false,
8467 load_partial_comp_unit_reader, NULL);
8471 read_comp_units_from_section (struct dwarf2_per_objfile *dwarf2_per_objfile,
8472 struct dwarf2_section_info *section,
8473 struct dwarf2_section_info *abbrev_section,
8474 unsigned int is_dwz)
8476 const gdb_byte *info_ptr;
8477 struct objfile *objfile = dwarf2_per_objfile->objfile;
8479 if (dwarf_read_debug)
8480 fprintf_unfiltered (gdb_stdlog, "Reading %s for %s\n",
8481 get_section_name (section),
8482 get_section_file_name (section));
8484 dwarf2_read_section (objfile, section);
8486 info_ptr = section->buffer;
8488 while (info_ptr < section->buffer + section->size)
8490 struct dwarf2_per_cu_data *this_cu;
8492 sect_offset sect_off = (sect_offset) (info_ptr - section->buffer);
8494 comp_unit_head cu_header;
8495 read_and_check_comp_unit_head (dwarf2_per_objfile, &cu_header, section,
8496 abbrev_section, info_ptr,
8497 rcuh_kind::COMPILE);
8499 /* Save the compilation unit for later lookup. */
8500 if (cu_header.unit_type != DW_UT_type)
8502 this_cu = XOBNEW (&objfile->objfile_obstack,
8503 struct dwarf2_per_cu_data);
8504 memset (this_cu, 0, sizeof (*this_cu));
8508 auto sig_type = XOBNEW (&objfile->objfile_obstack,
8509 struct signatured_type);
8510 memset (sig_type, 0, sizeof (*sig_type));
8511 sig_type->signature = cu_header.signature;
8512 sig_type->type_offset_in_tu = cu_header.type_cu_offset_in_tu;
8513 this_cu = &sig_type->per_cu;
8515 this_cu->is_debug_types = (cu_header.unit_type == DW_UT_type);
8516 this_cu->sect_off = sect_off;
8517 this_cu->length = cu_header.length + cu_header.initial_length_size;
8518 this_cu->is_dwz = is_dwz;
8519 this_cu->dwarf2_per_objfile = dwarf2_per_objfile;
8520 this_cu->section = section;
8522 dwarf2_per_objfile->all_comp_units.push_back (this_cu);
8524 info_ptr = info_ptr + this_cu->length;
8528 /* Create a list of all compilation units in OBJFILE.
8529 This is only done for -readnow and building partial symtabs. */
8532 create_all_comp_units (struct dwarf2_per_objfile *dwarf2_per_objfile)
8534 gdb_assert (dwarf2_per_objfile->all_comp_units.empty ());
8535 read_comp_units_from_section (dwarf2_per_objfile, &dwarf2_per_objfile->info,
8536 &dwarf2_per_objfile->abbrev, 0);
8538 dwz_file *dwz = dwarf2_get_dwz_file (dwarf2_per_objfile);
8540 read_comp_units_from_section (dwarf2_per_objfile, &dwz->info, &dwz->abbrev,
8544 /* Process all loaded DIEs for compilation unit CU, starting at
8545 FIRST_DIE. The caller should pass SET_ADDRMAP == 1 if the compilation
8546 unit DIE did not have PC info (DW_AT_low_pc and DW_AT_high_pc, or
8547 DW_AT_ranges). See the comments of add_partial_subprogram on how
8548 SET_ADDRMAP is used and how *LOWPC and *HIGHPC are updated. */
8551 scan_partial_symbols (struct partial_die_info *first_die, CORE_ADDR *lowpc,
8552 CORE_ADDR *highpc, int set_addrmap,
8553 struct dwarf2_cu *cu)
8555 struct partial_die_info *pdi;
8557 /* Now, march along the PDI's, descending into ones which have
8558 interesting children but skipping the children of the other ones,
8559 until we reach the end of the compilation unit. */
8567 /* Anonymous namespaces or modules have no name but have interesting
8568 children, so we need to look at them. Ditto for anonymous
8571 if (pdi->name != NULL || pdi->tag == DW_TAG_namespace
8572 || pdi->tag == DW_TAG_module || pdi->tag == DW_TAG_enumeration_type
8573 || pdi->tag == DW_TAG_imported_unit
8574 || pdi->tag == DW_TAG_inlined_subroutine)
8578 case DW_TAG_subprogram:
8579 case DW_TAG_inlined_subroutine:
8580 add_partial_subprogram (pdi, lowpc, highpc, set_addrmap, cu);
8582 case DW_TAG_constant:
8583 case DW_TAG_variable:
8584 case DW_TAG_typedef:
8585 case DW_TAG_union_type:
8586 if (!pdi->is_declaration)
8588 add_partial_symbol (pdi, cu);
8591 case DW_TAG_class_type:
8592 case DW_TAG_interface_type:
8593 case DW_TAG_structure_type:
8594 if (!pdi->is_declaration)
8596 add_partial_symbol (pdi, cu);
8598 if ((cu->language == language_rust
8599 || cu->language == language_cplus) && pdi->has_children)
8600 scan_partial_symbols (pdi->die_child, lowpc, highpc,
8603 case DW_TAG_enumeration_type:
8604 if (!pdi->is_declaration)
8605 add_partial_enumeration (pdi, cu);
8607 case DW_TAG_base_type:
8608 case DW_TAG_subrange_type:
8609 /* File scope base type definitions are added to the partial
8611 add_partial_symbol (pdi, cu);
8613 case DW_TAG_namespace:
8614 add_partial_namespace (pdi, lowpc, highpc, set_addrmap, cu);
8617 add_partial_module (pdi, lowpc, highpc, set_addrmap, cu);
8619 case DW_TAG_imported_unit:
8621 struct dwarf2_per_cu_data *per_cu;
8623 /* For now we don't handle imported units in type units. */
8624 if (cu->per_cu->is_debug_types)
8626 error (_("Dwarf Error: DW_TAG_imported_unit is not"
8627 " supported in type units [in module %s]"),
8628 objfile_name (cu->per_cu->dwarf2_per_objfile->objfile));
8631 per_cu = dwarf2_find_containing_comp_unit
8632 (pdi->d.sect_off, pdi->is_dwz,
8633 cu->per_cu->dwarf2_per_objfile);
8635 /* Go read the partial unit, if needed. */
8636 if (per_cu->v.psymtab == NULL)
8637 process_psymtab_comp_unit (per_cu, 1, cu->language);
8639 VEC_safe_push (dwarf2_per_cu_ptr,
8640 cu->per_cu->imported_symtabs, per_cu);
8643 case DW_TAG_imported_declaration:
8644 add_partial_symbol (pdi, cu);
8651 /* If the die has a sibling, skip to the sibling. */
8653 pdi = pdi->die_sibling;
8657 /* Functions used to compute the fully scoped name of a partial DIE.
8659 Normally, this is simple. For C++, the parent DIE's fully scoped
8660 name is concatenated with "::" and the partial DIE's name.
8661 Enumerators are an exception; they use the scope of their parent
8662 enumeration type, i.e. the name of the enumeration type is not
8663 prepended to the enumerator.
8665 There are two complexities. One is DW_AT_specification; in this
8666 case "parent" means the parent of the target of the specification,
8667 instead of the direct parent of the DIE. The other is compilers
8668 which do not emit DW_TAG_namespace; in this case we try to guess
8669 the fully qualified name of structure types from their members'
8670 linkage names. This must be done using the DIE's children rather
8671 than the children of any DW_AT_specification target. We only need
8672 to do this for structures at the top level, i.e. if the target of
8673 any DW_AT_specification (if any; otherwise the DIE itself) does not
8676 /* Compute the scope prefix associated with PDI's parent, in
8677 compilation unit CU. The result will be allocated on CU's
8678 comp_unit_obstack, or a copy of the already allocated PDI->NAME
8679 field. NULL is returned if no prefix is necessary. */
8681 partial_die_parent_scope (struct partial_die_info *pdi,
8682 struct dwarf2_cu *cu)
8684 const char *grandparent_scope;
8685 struct partial_die_info *parent, *real_pdi;
8687 /* We need to look at our parent DIE; if we have a DW_AT_specification,
8688 then this means the parent of the specification DIE. */
8691 while (real_pdi->has_specification)
8692 real_pdi = find_partial_die (real_pdi->spec_offset,
8693 real_pdi->spec_is_dwz, cu);
8695 parent = real_pdi->die_parent;
8699 if (parent->scope_set)
8700 return parent->scope;
8704 grandparent_scope = partial_die_parent_scope (parent, cu);
8706 /* GCC 4.0 and 4.1 had a bug (PR c++/28460) where they generated bogus
8707 DW_TAG_namespace DIEs with a name of "::" for the global namespace.
8708 Work around this problem here. */
8709 if (cu->language == language_cplus
8710 && parent->tag == DW_TAG_namespace
8711 && strcmp (parent->name, "::") == 0
8712 && grandparent_scope == NULL)
8714 parent->scope = NULL;
8715 parent->scope_set = 1;
8719 if (pdi->tag == DW_TAG_enumerator)
8720 /* Enumerators should not get the name of the enumeration as a prefix. */
8721 parent->scope = grandparent_scope;
8722 else if (parent->tag == DW_TAG_namespace
8723 || parent->tag == DW_TAG_module
8724 || parent->tag == DW_TAG_structure_type
8725 || parent->tag == DW_TAG_class_type
8726 || parent->tag == DW_TAG_interface_type
8727 || parent->tag == DW_TAG_union_type
8728 || parent->tag == DW_TAG_enumeration_type)
8730 if (grandparent_scope == NULL)
8731 parent->scope = parent->name;
8733 parent->scope = typename_concat (&cu->comp_unit_obstack,
8735 parent->name, 0, cu);
8739 /* FIXME drow/2004-04-01: What should we be doing with
8740 function-local names? For partial symbols, we should probably be
8742 complaint (&symfile_complaints,
8743 _("unhandled containing DIE tag %d for DIE at %s"),
8744 parent->tag, sect_offset_str (pdi->sect_off));
8745 parent->scope = grandparent_scope;
8748 parent->scope_set = 1;
8749 return parent->scope;
8752 /* Return the fully scoped name associated with PDI, from compilation unit
8753 CU. The result will be allocated with malloc. */
8756 partial_die_full_name (struct partial_die_info *pdi,
8757 struct dwarf2_cu *cu)
8759 const char *parent_scope;
8761 /* If this is a template instantiation, we can not work out the
8762 template arguments from partial DIEs. So, unfortunately, we have
8763 to go through the full DIEs. At least any work we do building
8764 types here will be reused if full symbols are loaded later. */
8765 if (pdi->has_template_arguments)
8769 if (pdi->name != NULL && strchr (pdi->name, '<') == NULL)
8771 struct die_info *die;
8772 struct attribute attr;
8773 struct dwarf2_cu *ref_cu = cu;
8775 /* DW_FORM_ref_addr is using section offset. */
8776 attr.name = (enum dwarf_attribute) 0;
8777 attr.form = DW_FORM_ref_addr;
8778 attr.u.unsnd = to_underlying (pdi->sect_off);
8779 die = follow_die_ref (NULL, &attr, &ref_cu);
8781 return xstrdup (dwarf2_full_name (NULL, die, ref_cu));
8785 parent_scope = partial_die_parent_scope (pdi, cu);
8786 if (parent_scope == NULL)
8789 return typename_concat (NULL, parent_scope, pdi->name, 0, cu);
8793 add_partial_symbol (struct partial_die_info *pdi, struct dwarf2_cu *cu)
8795 struct dwarf2_per_objfile *dwarf2_per_objfile
8796 = cu->per_cu->dwarf2_per_objfile;
8797 struct objfile *objfile = dwarf2_per_objfile->objfile;
8798 struct gdbarch *gdbarch = get_objfile_arch (objfile);
8800 const char *actual_name = NULL;
8802 char *built_actual_name;
8804 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
8806 built_actual_name = partial_die_full_name (pdi, cu);
8807 if (built_actual_name != NULL)
8808 actual_name = built_actual_name;
8810 if (actual_name == NULL)
8811 actual_name = pdi->name;
8815 case DW_TAG_inlined_subroutine:
8816 case DW_TAG_subprogram:
8817 addr = gdbarch_adjust_dwarf2_addr (gdbarch, pdi->lowpc + baseaddr);
8818 if (pdi->is_external || cu->language == language_ada)
8820 /* brobecker/2007-12-26: Normally, only "external" DIEs are part
8821 of the global scope. But in Ada, we want to be able to access
8822 nested procedures globally. So all Ada subprograms are stored
8823 in the global scope. */
8824 add_psymbol_to_list (actual_name, strlen (actual_name),
8825 built_actual_name != NULL,
8826 VAR_DOMAIN, LOC_BLOCK,
8827 &objfile->global_psymbols,
8828 addr, cu->language, objfile);
8832 add_psymbol_to_list (actual_name, strlen (actual_name),
8833 built_actual_name != NULL,
8834 VAR_DOMAIN, LOC_BLOCK,
8835 &objfile->static_psymbols,
8836 addr, cu->language, objfile);
8839 if (pdi->main_subprogram && actual_name != NULL)
8840 set_objfile_main_name (objfile, actual_name, cu->language);
8842 case DW_TAG_constant:
8844 std::vector<partial_symbol *> *list;
8846 if (pdi->is_external)
8847 list = &objfile->global_psymbols;
8849 list = &objfile->static_psymbols;
8850 add_psymbol_to_list (actual_name, strlen (actual_name),
8851 built_actual_name != NULL, VAR_DOMAIN, LOC_STATIC,
8852 list, 0, cu->language, objfile);
8855 case DW_TAG_variable:
8857 addr = decode_locdesc (pdi->d.locdesc, cu);
8861 && !dwarf2_per_objfile->has_section_at_zero)
8863 /* A global or static variable may also have been stripped
8864 out by the linker if unused, in which case its address
8865 will be nullified; do not add such variables into partial
8866 symbol table then. */
8868 else if (pdi->is_external)
8871 Don't enter into the minimal symbol tables as there is
8872 a minimal symbol table entry from the ELF symbols already.
8873 Enter into partial symbol table if it has a location
8874 descriptor or a type.
8875 If the location descriptor is missing, new_symbol will create
8876 a LOC_UNRESOLVED symbol, the address of the variable will then
8877 be determined from the minimal symbol table whenever the variable
8879 The address for the partial symbol table entry is not
8880 used by GDB, but it comes in handy for debugging partial symbol
8883 if (pdi->d.locdesc || pdi->has_type)
8884 add_psymbol_to_list (actual_name, strlen (actual_name),
8885 built_actual_name != NULL,
8886 VAR_DOMAIN, LOC_STATIC,
8887 &objfile->global_psymbols,
8889 cu->language, objfile);
8893 int has_loc = pdi->d.locdesc != NULL;
8895 /* Static Variable. Skip symbols whose value we cannot know (those
8896 without location descriptors or constant values). */
8897 if (!has_loc && !pdi->has_const_value)
8899 xfree (built_actual_name);
8903 add_psymbol_to_list (actual_name, strlen (actual_name),
8904 built_actual_name != NULL,
8905 VAR_DOMAIN, LOC_STATIC,
8906 &objfile->static_psymbols,
8907 has_loc ? addr + baseaddr : (CORE_ADDR) 0,
8908 cu->language, objfile);
8911 case DW_TAG_typedef:
8912 case DW_TAG_base_type:
8913 case DW_TAG_subrange_type:
8914 add_psymbol_to_list (actual_name, strlen (actual_name),
8915 built_actual_name != NULL,
8916 VAR_DOMAIN, LOC_TYPEDEF,
8917 &objfile->static_psymbols,
8918 0, cu->language, objfile);
8920 case DW_TAG_imported_declaration:
8921 case DW_TAG_namespace:
8922 add_psymbol_to_list (actual_name, strlen (actual_name),
8923 built_actual_name != NULL,
8924 VAR_DOMAIN, LOC_TYPEDEF,
8925 &objfile->global_psymbols,
8926 0, cu->language, objfile);
8929 add_psymbol_to_list (actual_name, strlen (actual_name),
8930 built_actual_name != NULL,
8931 MODULE_DOMAIN, LOC_TYPEDEF,
8932 &objfile->global_psymbols,
8933 0, cu->language, objfile);
8935 case DW_TAG_class_type:
8936 case DW_TAG_interface_type:
8937 case DW_TAG_structure_type:
8938 case DW_TAG_union_type:
8939 case DW_TAG_enumeration_type:
8940 /* Skip external references. The DWARF standard says in the section
8941 about "Structure, Union, and Class Type Entries": "An incomplete
8942 structure, union or class type is represented by a structure,
8943 union or class entry that does not have a byte size attribute
8944 and that has a DW_AT_declaration attribute." */
8945 if (!pdi->has_byte_size && pdi->is_declaration)
8947 xfree (built_actual_name);
8951 /* NOTE: carlton/2003-10-07: See comment in new_symbol about
8952 static vs. global. */
8953 add_psymbol_to_list (actual_name, strlen (actual_name),
8954 built_actual_name != NULL,
8955 STRUCT_DOMAIN, LOC_TYPEDEF,
8956 cu->language == language_cplus
8957 ? &objfile->global_psymbols
8958 : &objfile->static_psymbols,
8959 0, cu->language, objfile);
8962 case DW_TAG_enumerator:
8963 add_psymbol_to_list (actual_name, strlen (actual_name),
8964 built_actual_name != NULL,
8965 VAR_DOMAIN, LOC_CONST,
8966 cu->language == language_cplus
8967 ? &objfile->global_psymbols
8968 : &objfile->static_psymbols,
8969 0, cu->language, objfile);
8975 xfree (built_actual_name);
8978 /* Read a partial die corresponding to a namespace; also, add a symbol
8979 corresponding to that namespace to the symbol table. NAMESPACE is
8980 the name of the enclosing namespace. */
8983 add_partial_namespace (struct partial_die_info *pdi,
8984 CORE_ADDR *lowpc, CORE_ADDR *highpc,
8985 int set_addrmap, struct dwarf2_cu *cu)
8987 /* Add a symbol for the namespace. */
8989 add_partial_symbol (pdi, cu);
8991 /* Now scan partial symbols in that namespace. */
8993 if (pdi->has_children)
8994 scan_partial_symbols (pdi->die_child, lowpc, highpc, set_addrmap, cu);
8997 /* Read a partial die corresponding to a Fortran module. */
9000 add_partial_module (struct partial_die_info *pdi, CORE_ADDR *lowpc,
9001 CORE_ADDR *highpc, int set_addrmap, struct dwarf2_cu *cu)
9003 /* Add a symbol for the namespace. */
9005 add_partial_symbol (pdi, cu);
9007 /* Now scan partial symbols in that module. */
9009 if (pdi->has_children)
9010 scan_partial_symbols (pdi->die_child, lowpc, highpc, set_addrmap, cu);
9013 /* Read a partial die corresponding to a subprogram or an inlined
9014 subprogram and create a partial symbol for that subprogram.
9015 When the CU language allows it, this routine also defines a partial
9016 symbol for each nested subprogram that this subprogram contains.
9017 If SET_ADDRMAP is true, record the covered ranges in the addrmap.
9018 Set *LOWPC and *HIGHPC to the lowest and highest PC values found in PDI.
9020 PDI may also be a lexical block, in which case we simply search
9021 recursively for subprograms defined inside that lexical block.
9022 Again, this is only performed when the CU language allows this
9023 type of definitions. */
9026 add_partial_subprogram (struct partial_die_info *pdi,
9027 CORE_ADDR *lowpc, CORE_ADDR *highpc,
9028 int set_addrmap, struct dwarf2_cu *cu)
9030 if (pdi->tag == DW_TAG_subprogram || pdi->tag == DW_TAG_inlined_subroutine)
9032 if (pdi->has_pc_info)
9034 if (pdi->lowpc < *lowpc)
9035 *lowpc = pdi->lowpc;
9036 if (pdi->highpc > *highpc)
9037 *highpc = pdi->highpc;
9040 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
9041 struct gdbarch *gdbarch = get_objfile_arch (objfile);
9046 baseaddr = ANOFFSET (objfile->section_offsets,
9047 SECT_OFF_TEXT (objfile));
9048 lowpc = gdbarch_adjust_dwarf2_addr (gdbarch,
9049 pdi->lowpc + baseaddr);
9050 highpc = gdbarch_adjust_dwarf2_addr (gdbarch,
9051 pdi->highpc + baseaddr);
9052 addrmap_set_empty (objfile->psymtabs_addrmap, lowpc, highpc - 1,
9053 cu->per_cu->v.psymtab);
9057 if (pdi->has_pc_info || (!pdi->is_external && pdi->may_be_inlined))
9059 if (!pdi->is_declaration)
9060 /* Ignore subprogram DIEs that do not have a name, they are
9061 illegal. Do not emit a complaint at this point, we will
9062 do so when we convert this psymtab into a symtab. */
9064 add_partial_symbol (pdi, cu);
9068 if (! pdi->has_children)
9071 if (cu->language == language_ada)
9073 pdi = pdi->die_child;
9077 if (pdi->tag == DW_TAG_subprogram
9078 || pdi->tag == DW_TAG_inlined_subroutine
9079 || pdi->tag == DW_TAG_lexical_block)
9080 add_partial_subprogram (pdi, lowpc, highpc, set_addrmap, cu);
9081 pdi = pdi->die_sibling;
9086 /* Read a partial die corresponding to an enumeration type. */
9089 add_partial_enumeration (struct partial_die_info *enum_pdi,
9090 struct dwarf2_cu *cu)
9092 struct partial_die_info *pdi;
9094 if (enum_pdi->name != NULL)
9095 add_partial_symbol (enum_pdi, cu);
9097 pdi = enum_pdi->die_child;
9100 if (pdi->tag != DW_TAG_enumerator || pdi->name == NULL)
9101 complaint (&symfile_complaints, _("malformed enumerator DIE ignored"));
9103 add_partial_symbol (pdi, cu);
9104 pdi = pdi->die_sibling;
9108 /* Return the initial uleb128 in the die at INFO_PTR. */
9111 peek_abbrev_code (bfd *abfd, const gdb_byte *info_ptr)
9113 unsigned int bytes_read;
9115 return read_unsigned_leb128 (abfd, info_ptr, &bytes_read);
9118 /* Read the initial uleb128 in the die at INFO_PTR in compilation unit
9119 READER::CU. Use READER::ABBREV_TABLE to lookup any abbreviation.
9121 Return the corresponding abbrev, or NULL if the number is zero (indicating
9122 an empty DIE). In either case *BYTES_READ will be set to the length of
9123 the initial number. */
9125 static struct abbrev_info *
9126 peek_die_abbrev (const die_reader_specs &reader,
9127 const gdb_byte *info_ptr, unsigned int *bytes_read)
9129 dwarf2_cu *cu = reader.cu;
9130 bfd *abfd = cu->per_cu->dwarf2_per_objfile->objfile->obfd;
9131 unsigned int abbrev_number
9132 = read_unsigned_leb128 (abfd, info_ptr, bytes_read);
9134 if (abbrev_number == 0)
9137 abbrev_info *abbrev = reader.abbrev_table->lookup_abbrev (abbrev_number);
9140 error (_("Dwarf Error: Could not find abbrev number %d in %s"
9141 " at offset %s [in module %s]"),
9142 abbrev_number, cu->per_cu->is_debug_types ? "TU" : "CU",
9143 sect_offset_str (cu->header.sect_off), bfd_get_filename (abfd));
9149 /* Scan the debug information for CU starting at INFO_PTR in buffer BUFFER.
9150 Returns a pointer to the end of a series of DIEs, terminated by an empty
9151 DIE. Any children of the skipped DIEs will also be skipped. */
9153 static const gdb_byte *
9154 skip_children (const struct die_reader_specs *reader, const gdb_byte *info_ptr)
9158 unsigned int bytes_read;
9159 abbrev_info *abbrev = peek_die_abbrev (*reader, info_ptr, &bytes_read);
9162 return info_ptr + bytes_read;
9164 info_ptr = skip_one_die (reader, info_ptr + bytes_read, abbrev);
9168 /* Scan the debug information for CU starting at INFO_PTR in buffer BUFFER.
9169 INFO_PTR should point just after the initial uleb128 of a DIE, and the
9170 abbrev corresponding to that skipped uleb128 should be passed in
9171 ABBREV. Returns a pointer to this DIE's sibling, skipping any
9174 static const gdb_byte *
9175 skip_one_die (const struct die_reader_specs *reader, const gdb_byte *info_ptr,
9176 struct abbrev_info *abbrev)
9178 unsigned int bytes_read;
9179 struct attribute attr;
9180 bfd *abfd = reader->abfd;
9181 struct dwarf2_cu *cu = reader->cu;
9182 const gdb_byte *buffer = reader->buffer;
9183 const gdb_byte *buffer_end = reader->buffer_end;
9184 unsigned int form, i;
9186 for (i = 0; i < abbrev->num_attrs; i++)
9188 /* The only abbrev we care about is DW_AT_sibling. */
9189 if (abbrev->attrs[i].name == DW_AT_sibling)
9191 read_attribute (reader, &attr, &abbrev->attrs[i], info_ptr);
9192 if (attr.form == DW_FORM_ref_addr)
9193 complaint (&symfile_complaints,
9194 _("ignoring absolute DW_AT_sibling"));
9197 sect_offset off = dwarf2_get_ref_die_offset (&attr);
9198 const gdb_byte *sibling_ptr = buffer + to_underlying (off);
9200 if (sibling_ptr < info_ptr)
9201 complaint (&symfile_complaints,
9202 _("DW_AT_sibling points backwards"));
9203 else if (sibling_ptr > reader->buffer_end)
9204 dwarf2_section_buffer_overflow_complaint (reader->die_section);
9210 /* If it isn't DW_AT_sibling, skip this attribute. */
9211 form = abbrev->attrs[i].form;
9215 case DW_FORM_ref_addr:
9216 /* In DWARF 2, DW_FORM_ref_addr is address sized; in DWARF 3
9217 and later it is offset sized. */
9218 if (cu->header.version == 2)
9219 info_ptr += cu->header.addr_size;
9221 info_ptr += cu->header.offset_size;
9223 case DW_FORM_GNU_ref_alt:
9224 info_ptr += cu->header.offset_size;
9227 info_ptr += cu->header.addr_size;
9234 case DW_FORM_flag_present:
9235 case DW_FORM_implicit_const:
9247 case DW_FORM_ref_sig8:
9250 case DW_FORM_data16:
9253 case DW_FORM_string:
9254 read_direct_string (abfd, info_ptr, &bytes_read);
9255 info_ptr += bytes_read;
9257 case DW_FORM_sec_offset:
9259 case DW_FORM_GNU_strp_alt:
9260 info_ptr += cu->header.offset_size;
9262 case DW_FORM_exprloc:
9264 info_ptr += read_unsigned_leb128 (abfd, info_ptr, &bytes_read);
9265 info_ptr += bytes_read;
9267 case DW_FORM_block1:
9268 info_ptr += 1 + read_1_byte (abfd, info_ptr);
9270 case DW_FORM_block2:
9271 info_ptr += 2 + read_2_bytes (abfd, info_ptr);
9273 case DW_FORM_block4:
9274 info_ptr += 4 + read_4_bytes (abfd, info_ptr);
9278 case DW_FORM_ref_udata:
9279 case DW_FORM_GNU_addr_index:
9280 case DW_FORM_GNU_str_index:
9281 info_ptr = safe_skip_leb128 (info_ptr, buffer_end);
9283 case DW_FORM_indirect:
9284 form = read_unsigned_leb128 (abfd, info_ptr, &bytes_read);
9285 info_ptr += bytes_read;
9286 /* We need to continue parsing from here, so just go back to
9288 goto skip_attribute;
9291 error (_("Dwarf Error: Cannot handle %s "
9292 "in DWARF reader [in module %s]"),
9293 dwarf_form_name (form),
9294 bfd_get_filename (abfd));
9298 if (abbrev->has_children)
9299 return skip_children (reader, info_ptr);
9304 /* Locate ORIG_PDI's sibling.
9305 INFO_PTR should point to the start of the next DIE after ORIG_PDI. */
9307 static const gdb_byte *
9308 locate_pdi_sibling (const struct die_reader_specs *reader,
9309 struct partial_die_info *orig_pdi,
9310 const gdb_byte *info_ptr)
9312 /* Do we know the sibling already? */
9314 if (orig_pdi->sibling)
9315 return orig_pdi->sibling;
9317 /* Are there any children to deal with? */
9319 if (!orig_pdi->has_children)
9322 /* Skip the children the long way. */
9324 return skip_children (reader, info_ptr);
9327 /* Expand this partial symbol table into a full symbol table. SELF is
9331 dwarf2_read_symtab (struct partial_symtab *self,
9332 struct objfile *objfile)
9334 struct dwarf2_per_objfile *dwarf2_per_objfile
9335 = get_dwarf2_per_objfile (objfile);
9339 warning (_("bug: psymtab for %s is already read in."),
9346 printf_filtered (_("Reading in symbols for %s..."),
9348 gdb_flush (gdb_stdout);
9351 /* If this psymtab is constructed from a debug-only objfile, the
9352 has_section_at_zero flag will not necessarily be correct. We
9353 can get the correct value for this flag by looking at the data
9354 associated with the (presumably stripped) associated objfile. */
9355 if (objfile->separate_debug_objfile_backlink)
9357 struct dwarf2_per_objfile *dpo_backlink
9358 = get_dwarf2_per_objfile (objfile->separate_debug_objfile_backlink);
9360 dwarf2_per_objfile->has_section_at_zero
9361 = dpo_backlink->has_section_at_zero;
9364 dwarf2_per_objfile->reading_partial_symbols = 0;
9366 psymtab_to_symtab_1 (self);
9368 /* Finish up the debug error message. */
9370 printf_filtered (_("done.\n"));
9373 process_cu_includes (dwarf2_per_objfile);
9376 /* Reading in full CUs. */
9378 /* Add PER_CU to the queue. */
9381 queue_comp_unit (struct dwarf2_per_cu_data *per_cu,
9382 enum language pretend_language)
9384 struct dwarf2_queue_item *item;
9387 item = XNEW (struct dwarf2_queue_item);
9388 item->per_cu = per_cu;
9389 item->pretend_language = pretend_language;
9392 if (dwarf2_queue == NULL)
9393 dwarf2_queue = item;
9395 dwarf2_queue_tail->next = item;
9397 dwarf2_queue_tail = item;
9400 /* If PER_CU is not yet queued, add it to the queue.
9401 If DEPENDENT_CU is non-NULL, it has a reference to PER_CU so add a
9403 The result is non-zero if PER_CU was queued, otherwise the result is zero
9404 meaning either PER_CU is already queued or it is already loaded.
9406 N.B. There is an invariant here that if a CU is queued then it is loaded.
9407 The caller is required to load PER_CU if we return non-zero. */
9410 maybe_queue_comp_unit (struct dwarf2_cu *dependent_cu,
9411 struct dwarf2_per_cu_data *per_cu,
9412 enum language pretend_language)
9414 /* We may arrive here during partial symbol reading, if we need full
9415 DIEs to process an unusual case (e.g. template arguments). Do
9416 not queue PER_CU, just tell our caller to load its DIEs. */
9417 if (per_cu->dwarf2_per_objfile->reading_partial_symbols)
9419 if (per_cu->cu == NULL || per_cu->cu->dies == NULL)
9424 /* Mark the dependence relation so that we don't flush PER_CU
9426 if (dependent_cu != NULL)
9427 dwarf2_add_dependence (dependent_cu, per_cu);
9429 /* If it's already on the queue, we have nothing to do. */
9433 /* If the compilation unit is already loaded, just mark it as
9435 if (per_cu->cu != NULL)
9437 per_cu->cu->last_used = 0;
9441 /* Add it to the queue. */
9442 queue_comp_unit (per_cu, pretend_language);
9447 /* Process the queue. */
9450 process_queue (struct dwarf2_per_objfile *dwarf2_per_objfile)
9452 struct dwarf2_queue_item *item, *next_item;
9454 if (dwarf_read_debug)
9456 fprintf_unfiltered (gdb_stdlog,
9457 "Expanding one or more symtabs of objfile %s ...\n",
9458 objfile_name (dwarf2_per_objfile->objfile));
9461 /* The queue starts out with one item, but following a DIE reference
9462 may load a new CU, adding it to the end of the queue. */
9463 for (item = dwarf2_queue; item != NULL; dwarf2_queue = item = next_item)
9465 if ((dwarf2_per_objfile->using_index
9466 ? !item->per_cu->v.quick->compunit_symtab
9467 : (item->per_cu->v.psymtab && !item->per_cu->v.psymtab->readin))
9468 /* Skip dummy CUs. */
9469 && item->per_cu->cu != NULL)
9471 struct dwarf2_per_cu_data *per_cu = item->per_cu;
9472 unsigned int debug_print_threshold;
9475 if (per_cu->is_debug_types)
9477 struct signatured_type *sig_type =
9478 (struct signatured_type *) per_cu;
9480 sprintf (buf, "TU %s at offset %s",
9481 hex_string (sig_type->signature),
9482 sect_offset_str (per_cu->sect_off));
9483 /* There can be 100s of TUs.
9484 Only print them in verbose mode. */
9485 debug_print_threshold = 2;
9489 sprintf (buf, "CU at offset %s",
9490 sect_offset_str (per_cu->sect_off));
9491 debug_print_threshold = 1;
9494 if (dwarf_read_debug >= debug_print_threshold)
9495 fprintf_unfiltered (gdb_stdlog, "Expanding symtab of %s\n", buf);
9497 if (per_cu->is_debug_types)
9498 process_full_type_unit (per_cu, item->pretend_language);
9500 process_full_comp_unit (per_cu, item->pretend_language);
9502 if (dwarf_read_debug >= debug_print_threshold)
9503 fprintf_unfiltered (gdb_stdlog, "Done expanding %s\n", buf);
9506 item->per_cu->queued = 0;
9507 next_item = item->next;
9511 dwarf2_queue_tail = NULL;
9513 if (dwarf_read_debug)
9515 fprintf_unfiltered (gdb_stdlog, "Done expanding symtabs of %s.\n",
9516 objfile_name (dwarf2_per_objfile->objfile));
9520 /* Read in full symbols for PST, and anything it depends on. */
9523 psymtab_to_symtab_1 (struct partial_symtab *pst)
9525 struct dwarf2_per_cu_data *per_cu;
9531 for (i = 0; i < pst->number_of_dependencies; i++)
9532 if (!pst->dependencies[i]->readin
9533 && pst->dependencies[i]->user == NULL)
9535 /* Inform about additional files that need to be read in. */
9538 /* FIXME: i18n: Need to make this a single string. */
9539 fputs_filtered (" ", gdb_stdout);
9541 fputs_filtered ("and ", gdb_stdout);
9543 printf_filtered ("%s...", pst->dependencies[i]->filename);
9544 wrap_here (""); /* Flush output. */
9545 gdb_flush (gdb_stdout);
9547 psymtab_to_symtab_1 (pst->dependencies[i]);
9550 per_cu = (struct dwarf2_per_cu_data *) pst->read_symtab_private;
9554 /* It's an include file, no symbols to read for it.
9555 Everything is in the parent symtab. */
9560 dw2_do_instantiate_symtab (per_cu, false);
9563 /* Trivial hash function for die_info: the hash value of a DIE
9564 is its offset in .debug_info for this objfile. */
9567 die_hash (const void *item)
9569 const struct die_info *die = (const struct die_info *) item;
9571 return to_underlying (die->sect_off);
9574 /* Trivial comparison function for die_info structures: two DIEs
9575 are equal if they have the same offset. */
9578 die_eq (const void *item_lhs, const void *item_rhs)
9580 const struct die_info *die_lhs = (const struct die_info *) item_lhs;
9581 const struct die_info *die_rhs = (const struct die_info *) item_rhs;
9583 return die_lhs->sect_off == die_rhs->sect_off;
9586 /* die_reader_func for load_full_comp_unit.
9587 This is identical to read_signatured_type_reader,
9588 but is kept separate for now. */
9591 load_full_comp_unit_reader (const struct die_reader_specs *reader,
9592 const gdb_byte *info_ptr,
9593 struct die_info *comp_unit_die,
9597 struct dwarf2_cu *cu = reader->cu;
9598 enum language *language_ptr = (enum language *) data;
9600 gdb_assert (cu->die_hash == NULL);
9602 htab_create_alloc_ex (cu->header.length / 12,
9606 &cu->comp_unit_obstack,
9607 hashtab_obstack_allocate,
9608 dummy_obstack_deallocate);
9611 comp_unit_die->child = read_die_and_siblings (reader, info_ptr,
9612 &info_ptr, comp_unit_die);
9613 cu->dies = comp_unit_die;
9614 /* comp_unit_die is not stored in die_hash, no need. */
9616 /* We try not to read any attributes in this function, because not
9617 all CUs needed for references have been loaded yet, and symbol
9618 table processing isn't initialized. But we have to set the CU language,
9619 or we won't be able to build types correctly.
9620 Similarly, if we do not read the producer, we can not apply
9621 producer-specific interpretation. */
9622 prepare_one_comp_unit (cu, cu->dies, *language_ptr);
9625 /* Load the DIEs associated with PER_CU into memory. */
9628 load_full_comp_unit (struct dwarf2_per_cu_data *this_cu,
9630 enum language pretend_language)
9632 gdb_assert (! this_cu->is_debug_types);
9634 init_cutu_and_read_dies (this_cu, NULL, 1, 1, skip_partial,
9635 load_full_comp_unit_reader, &pretend_language);
9638 /* Add a DIE to the delayed physname list. */
9641 add_to_method_list (struct type *type, int fnfield_index, int index,
9642 const char *name, struct die_info *die,
9643 struct dwarf2_cu *cu)
9645 struct delayed_method_info mi;
9647 mi.fnfield_index = fnfield_index;
9651 cu->method_list.push_back (mi);
9654 /* Check whether [PHYSNAME, PHYSNAME+LEN) ends with a modifier like
9655 "const" / "volatile". If so, decrements LEN by the length of the
9656 modifier and return true. Otherwise return false. */
9660 check_modifier (const char *physname, size_t &len, const char (&mod)[N])
9662 size_t mod_len = sizeof (mod) - 1;
9663 if (len > mod_len && startswith (physname + (len - mod_len), mod))
9671 /* Compute the physnames of any methods on the CU's method list.
9673 The computation of method physnames is delayed in order to avoid the
9674 (bad) condition that one of the method's formal parameters is of an as yet
9678 compute_delayed_physnames (struct dwarf2_cu *cu)
9680 /* Only C++ delays computing physnames. */
9681 if (cu->method_list.empty ())
9683 gdb_assert (cu->language == language_cplus);
9685 for (struct delayed_method_info &mi : cu->method_list)
9687 const char *physname;
9688 struct fn_fieldlist *fn_flp
9689 = &TYPE_FN_FIELDLIST (mi.type, mi.fnfield_index);
9690 physname = dwarf2_physname (mi.name, mi.die, cu);
9691 TYPE_FN_FIELD_PHYSNAME (fn_flp->fn_fields, mi.index)
9692 = physname ? physname : "";
9694 /* Since there's no tag to indicate whether a method is a
9695 const/volatile overload, extract that information out of the
9697 if (physname != NULL)
9699 size_t len = strlen (physname);
9703 if (physname[len] == ')') /* shortcut */
9705 else if (check_modifier (physname, len, " const"))
9706 TYPE_FN_FIELD_CONST (fn_flp->fn_fields, mi.index) = 1;
9707 else if (check_modifier (physname, len, " volatile"))
9708 TYPE_FN_FIELD_VOLATILE (fn_flp->fn_fields, mi.index) = 1;
9715 /* The list is no longer needed. */
9716 cu->method_list.clear ();
9719 /* Go objects should be embedded in a DW_TAG_module DIE,
9720 and it's not clear if/how imported objects will appear.
9721 To keep Go support simple until that's worked out,
9722 go back through what we've read and create something usable.
9723 We could do this while processing each DIE, and feels kinda cleaner,
9724 but that way is more invasive.
9725 This is to, for example, allow the user to type "p var" or "b main"
9726 without having to specify the package name, and allow lookups
9727 of module.object to work in contexts that use the expression
9731 fixup_go_packaging (struct dwarf2_cu *cu)
9733 char *package_name = NULL;
9734 struct pending *list;
9737 for (list = global_symbols; list != NULL; list = list->next)
9739 for (i = 0; i < list->nsyms; ++i)
9741 struct symbol *sym = list->symbol[i];
9743 if (SYMBOL_LANGUAGE (sym) == language_go
9744 && SYMBOL_CLASS (sym) == LOC_BLOCK)
9746 char *this_package_name = go_symbol_package_name (sym);
9748 if (this_package_name == NULL)
9750 if (package_name == NULL)
9751 package_name = this_package_name;
9754 struct objfile *objfile
9755 = cu->per_cu->dwarf2_per_objfile->objfile;
9756 if (strcmp (package_name, this_package_name) != 0)
9757 complaint (&symfile_complaints,
9758 _("Symtab %s has objects from two different Go packages: %s and %s"),
9759 (symbol_symtab (sym) != NULL
9760 ? symtab_to_filename_for_display
9761 (symbol_symtab (sym))
9762 : objfile_name (objfile)),
9763 this_package_name, package_name);
9764 xfree (this_package_name);
9770 if (package_name != NULL)
9772 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
9773 const char *saved_package_name
9774 = (const char *) obstack_copy0 (&objfile->per_bfd->storage_obstack,
9776 strlen (package_name));
9777 struct type *type = init_type (objfile, TYPE_CODE_MODULE, 0,
9778 saved_package_name);
9781 TYPE_TAG_NAME (type) = TYPE_NAME (type);
9783 sym = allocate_symbol (objfile);
9784 SYMBOL_SET_LANGUAGE (sym, language_go, &objfile->objfile_obstack);
9785 SYMBOL_SET_NAMES (sym, saved_package_name,
9786 strlen (saved_package_name), 0, objfile);
9787 /* This is not VAR_DOMAIN because we want a way to ensure a lookup of,
9788 e.g., "main" finds the "main" module and not C's main(). */
9789 SYMBOL_DOMAIN (sym) = STRUCT_DOMAIN;
9790 SYMBOL_ACLASS_INDEX (sym) = LOC_TYPEDEF;
9791 SYMBOL_TYPE (sym) = type;
9793 add_symbol_to_list (sym, &global_symbols);
9795 xfree (package_name);
9799 /* Allocate a fully-qualified name consisting of the two parts on the
9803 rust_fully_qualify (struct obstack *obstack, const char *p1, const char *p2)
9805 return obconcat (obstack, p1, "::", p2, (char *) NULL);
9808 /* A helper that allocates a struct discriminant_info to attach to a
9811 static struct discriminant_info *
9812 alloc_discriminant_info (struct type *type, int discriminant_index,
9815 gdb_assert (TYPE_CODE (type) == TYPE_CODE_UNION);
9816 gdb_assert (discriminant_index == -1
9817 || (discriminant_index >= 0
9818 && discriminant_index < TYPE_NFIELDS (type)));
9819 gdb_assert (default_index == -1
9820 || (default_index >= 0 && default_index < TYPE_NFIELDS (type)));
9822 TYPE_FLAG_DISCRIMINATED_UNION (type) = 1;
9824 struct discriminant_info *disc
9825 = ((struct discriminant_info *)
9827 offsetof (struct discriminant_info, discriminants)
9828 + TYPE_NFIELDS (type) * sizeof (disc->discriminants[0])));
9829 disc->default_index = default_index;
9830 disc->discriminant_index = discriminant_index;
9832 struct dynamic_prop prop;
9833 prop.kind = PROP_UNDEFINED;
9834 prop.data.baton = disc;
9836 add_dyn_prop (DYN_PROP_DISCRIMINATED, prop, type);
9841 /* Some versions of rustc emitted enums in an unusual way.
9843 Ordinary enums were emitted as unions. The first element of each
9844 structure in the union was named "RUST$ENUM$DISR". This element
9845 held the discriminant.
9847 These versions of Rust also implemented the "non-zero"
9848 optimization. When the enum had two values, and one is empty and
9849 the other holds a pointer that cannot be zero, the pointer is used
9850 as the discriminant, with a zero value meaning the empty variant.
9851 Here, the union's first member is of the form
9852 RUST$ENCODED$ENUM$<fieldno>$<fieldno>$...$<variantname>
9853 where the fieldnos are the indices of the fields that should be
9854 traversed in order to find the field (which may be several fields deep)
9855 and the variantname is the name of the variant of the case when the
9858 This function recognizes whether TYPE is of one of these forms,
9859 and, if so, smashes it to be a variant type. */
9862 quirk_rust_enum (struct type *type, struct objfile *objfile)
9864 gdb_assert (TYPE_CODE (type) == TYPE_CODE_UNION);
9866 /* We don't need to deal with empty enums. */
9867 if (TYPE_NFIELDS (type) == 0)
9870 #define RUST_ENUM_PREFIX "RUST$ENCODED$ENUM$"
9871 if (TYPE_NFIELDS (type) == 1
9872 && startswith (TYPE_FIELD_NAME (type, 0), RUST_ENUM_PREFIX))
9874 const char *name = TYPE_FIELD_NAME (type, 0) + strlen (RUST_ENUM_PREFIX);
9876 /* Decode the field name to find the offset of the
9878 ULONGEST bit_offset = 0;
9879 struct type *field_type = TYPE_FIELD_TYPE (type, 0);
9880 while (name[0] >= '0' && name[0] <= '9')
9883 unsigned long index = strtoul (name, &tail, 10);
9886 || index >= TYPE_NFIELDS (field_type)
9887 || (TYPE_FIELD_LOC_KIND (field_type, index)
9888 != FIELD_LOC_KIND_BITPOS))
9890 complaint (&symfile_complaints,
9891 _("Could not parse Rust enum encoding string \"%s\""
9893 TYPE_FIELD_NAME (type, 0),
9894 objfile_name (objfile));
9899 bit_offset += TYPE_FIELD_BITPOS (field_type, index);
9900 field_type = TYPE_FIELD_TYPE (field_type, index);
9903 /* Make a union to hold the variants. */
9904 struct type *union_type = alloc_type (objfile);
9905 TYPE_CODE (union_type) = TYPE_CODE_UNION;
9906 TYPE_NFIELDS (union_type) = 3;
9907 TYPE_FIELDS (union_type)
9908 = (struct field *) TYPE_ZALLOC (type, 3 * sizeof (struct field));
9909 TYPE_LENGTH (union_type) = TYPE_LENGTH (type);
9910 set_type_align (union_type, TYPE_RAW_ALIGN (type));
9912 /* Put the discriminant must at index 0. */
9913 TYPE_FIELD_TYPE (union_type, 0) = field_type;
9914 TYPE_FIELD_ARTIFICIAL (union_type, 0) = 1;
9915 TYPE_FIELD_NAME (union_type, 0) = "<<discriminant>>";
9916 SET_FIELD_BITPOS (TYPE_FIELD (union_type, 0), bit_offset);
9918 /* The order of fields doesn't really matter, so put the real
9919 field at index 1 and the data-less field at index 2. */
9920 struct discriminant_info *disc
9921 = alloc_discriminant_info (union_type, 0, 1);
9922 TYPE_FIELD (union_type, 1) = TYPE_FIELD (type, 0);
9923 TYPE_FIELD_NAME (union_type, 1)
9924 = rust_last_path_segment (TYPE_NAME (TYPE_FIELD_TYPE (union_type, 1)));
9925 TYPE_NAME (TYPE_FIELD_TYPE (union_type, 1))
9926 = rust_fully_qualify (&objfile->objfile_obstack, TYPE_NAME (type),
9927 TYPE_FIELD_NAME (union_type, 1));
9929 const char *dataless_name
9930 = rust_fully_qualify (&objfile->objfile_obstack, TYPE_NAME (type),
9932 struct type *dataless_type = init_type (objfile, TYPE_CODE_VOID, 0,
9934 TYPE_FIELD_TYPE (union_type, 2) = dataless_type;
9935 /* NAME points into the original discriminant name, which
9936 already has the correct lifetime. */
9937 TYPE_FIELD_NAME (union_type, 2) = name;
9938 SET_FIELD_BITPOS (TYPE_FIELD (union_type, 2), 0);
9939 disc->discriminants[2] = 0;
9941 /* Smash this type to be a structure type. We have to do this
9942 because the type has already been recorded. */
9943 TYPE_CODE (type) = TYPE_CODE_STRUCT;
9944 TYPE_NFIELDS (type) = 1;
9946 = (struct field *) TYPE_ZALLOC (type, sizeof (struct field));
9948 /* Install the variant part. */
9949 TYPE_FIELD_TYPE (type, 0) = union_type;
9950 SET_FIELD_BITPOS (TYPE_FIELD (type, 0), 0);
9951 TYPE_FIELD_NAME (type, 0) = "<<variants>>";
9953 else if (TYPE_NFIELDS (type) == 1)
9955 /* We assume that a union with a single field is a univariant
9957 /* Smash this type to be a structure type. We have to do this
9958 because the type has already been recorded. */
9959 TYPE_CODE (type) = TYPE_CODE_STRUCT;
9961 /* Make a union to hold the variants. */
9962 struct type *union_type = alloc_type (objfile);
9963 TYPE_CODE (union_type) = TYPE_CODE_UNION;
9964 TYPE_NFIELDS (union_type) = TYPE_NFIELDS (type);
9965 TYPE_LENGTH (union_type) = TYPE_LENGTH (type);
9966 set_type_align (union_type, TYPE_RAW_ALIGN (type));
9967 TYPE_FIELDS (union_type) = TYPE_FIELDS (type);
9969 struct type *field_type = TYPE_FIELD_TYPE (union_type, 0);
9970 const char *variant_name
9971 = rust_last_path_segment (TYPE_NAME (field_type));
9972 TYPE_FIELD_NAME (union_type, 0) = variant_name;
9973 TYPE_NAME (field_type)
9974 = rust_fully_qualify (&objfile->objfile_obstack,
9975 TYPE_NAME (type), variant_name);
9977 /* Install the union in the outer struct type. */
9978 TYPE_NFIELDS (type) = 1;
9980 = (struct field *) TYPE_ZALLOC (union_type, sizeof (struct field));
9981 TYPE_FIELD_TYPE (type, 0) = union_type;
9982 TYPE_FIELD_NAME (type, 0) = "<<variants>>";
9983 SET_FIELD_BITPOS (TYPE_FIELD (type, 0), 0);
9985 alloc_discriminant_info (union_type, -1, 0);
9989 struct type *disr_type = nullptr;
9990 for (int i = 0; i < TYPE_NFIELDS (type); ++i)
9992 disr_type = TYPE_FIELD_TYPE (type, i);
9994 if (TYPE_CODE (disr_type) != TYPE_CODE_STRUCT)
9996 /* All fields of a true enum will be structs. */
9999 else if (TYPE_NFIELDS (disr_type) == 0)
10001 /* Could be data-less variant, so keep going. */
10002 disr_type = nullptr;
10004 else if (strcmp (TYPE_FIELD_NAME (disr_type, 0),
10005 "RUST$ENUM$DISR") != 0)
10007 /* Not a Rust enum. */
10017 /* If we got here without a discriminant, then it's probably
10019 if (disr_type == nullptr)
10022 /* Smash this type to be a structure type. We have to do this
10023 because the type has already been recorded. */
10024 TYPE_CODE (type) = TYPE_CODE_STRUCT;
10026 /* Make a union to hold the variants. */
10027 struct field *disr_field = &TYPE_FIELD (disr_type, 0);
10028 struct type *union_type = alloc_type (objfile);
10029 TYPE_CODE (union_type) = TYPE_CODE_UNION;
10030 TYPE_NFIELDS (union_type) = 1 + TYPE_NFIELDS (type);
10031 TYPE_LENGTH (union_type) = TYPE_LENGTH (type);
10032 set_type_align (union_type, TYPE_RAW_ALIGN (type));
10033 TYPE_FIELDS (union_type)
10034 = (struct field *) TYPE_ZALLOC (union_type,
10035 (TYPE_NFIELDS (union_type)
10036 * sizeof (struct field)));
10038 memcpy (TYPE_FIELDS (union_type) + 1, TYPE_FIELDS (type),
10039 TYPE_NFIELDS (type) * sizeof (struct field));
10041 /* Install the discriminant at index 0 in the union. */
10042 TYPE_FIELD (union_type, 0) = *disr_field;
10043 TYPE_FIELD_ARTIFICIAL (union_type, 0) = 1;
10044 TYPE_FIELD_NAME (union_type, 0) = "<<discriminant>>";
10046 /* Install the union in the outer struct type. */
10047 TYPE_FIELD_TYPE (type, 0) = union_type;
10048 TYPE_FIELD_NAME (type, 0) = "<<variants>>";
10049 TYPE_NFIELDS (type) = 1;
10051 /* Set the size and offset of the union type. */
10052 SET_FIELD_BITPOS (TYPE_FIELD (type, 0), 0);
10054 /* We need a way to find the correct discriminant given a
10055 variant name. For convenience we build a map here. */
10056 struct type *enum_type = FIELD_TYPE (*disr_field);
10057 std::unordered_map<std::string, ULONGEST> discriminant_map;
10058 for (int i = 0; i < TYPE_NFIELDS (enum_type); ++i)
10060 if (TYPE_FIELD_LOC_KIND (enum_type, i) == FIELD_LOC_KIND_ENUMVAL)
10063 = rust_last_path_segment (TYPE_FIELD_NAME (enum_type, i));
10064 discriminant_map[name] = TYPE_FIELD_ENUMVAL (enum_type, i);
10068 int n_fields = TYPE_NFIELDS (union_type);
10069 struct discriminant_info *disc
10070 = alloc_discriminant_info (union_type, 0, -1);
10071 /* Skip the discriminant here. */
10072 for (int i = 1; i < n_fields; ++i)
10074 /* Find the final word in the name of this variant's type.
10075 That name can be used to look up the correct
10077 const char *variant_name
10078 = rust_last_path_segment (TYPE_NAME (TYPE_FIELD_TYPE (union_type,
10081 auto iter = discriminant_map.find (variant_name);
10082 if (iter != discriminant_map.end ())
10083 disc->discriminants[i] = iter->second;
10085 /* Remove the discriminant field, if it exists. */
10086 struct type *sub_type = TYPE_FIELD_TYPE (union_type, i);
10087 if (TYPE_NFIELDS (sub_type) > 0)
10089 --TYPE_NFIELDS (sub_type);
10090 ++TYPE_FIELDS (sub_type);
10092 TYPE_FIELD_NAME (union_type, i) = variant_name;
10093 TYPE_NAME (sub_type)
10094 = rust_fully_qualify (&objfile->objfile_obstack,
10095 TYPE_NAME (type), variant_name);
10100 /* Rewrite some Rust unions to be structures with variants parts. */
10103 rust_union_quirks (struct dwarf2_cu *cu)
10105 gdb_assert (cu->language == language_rust);
10106 for (struct type *type : cu->rust_unions)
10107 quirk_rust_enum (type, cu->per_cu->dwarf2_per_objfile->objfile);
10108 /* We don't need this any more. */
10109 cu->rust_unions.clear ();
10112 /* Return the symtab for PER_CU. This works properly regardless of
10113 whether we're using the index or psymtabs. */
10115 static struct compunit_symtab *
10116 get_compunit_symtab (struct dwarf2_per_cu_data *per_cu)
10118 return (per_cu->dwarf2_per_objfile->using_index
10119 ? per_cu->v.quick->compunit_symtab
10120 : per_cu->v.psymtab->compunit_symtab);
10123 /* A helper function for computing the list of all symbol tables
10124 included by PER_CU. */
10127 recursively_compute_inclusions (VEC (compunit_symtab_ptr) **result,
10128 htab_t all_children, htab_t all_type_symtabs,
10129 struct dwarf2_per_cu_data *per_cu,
10130 struct compunit_symtab *immediate_parent)
10134 struct compunit_symtab *cust;
10135 struct dwarf2_per_cu_data *iter;
10137 slot = htab_find_slot (all_children, per_cu, INSERT);
10140 /* This inclusion and its children have been processed. */
10145 /* Only add a CU if it has a symbol table. */
10146 cust = get_compunit_symtab (per_cu);
10149 /* If this is a type unit only add its symbol table if we haven't
10150 seen it yet (type unit per_cu's can share symtabs). */
10151 if (per_cu->is_debug_types)
10153 slot = htab_find_slot (all_type_symtabs, cust, INSERT);
10157 VEC_safe_push (compunit_symtab_ptr, *result, cust);
10158 if (cust->user == NULL)
10159 cust->user = immediate_parent;
10164 VEC_safe_push (compunit_symtab_ptr, *result, cust);
10165 if (cust->user == NULL)
10166 cust->user = immediate_parent;
10171 VEC_iterate (dwarf2_per_cu_ptr, per_cu->imported_symtabs, ix, iter);
10174 recursively_compute_inclusions (result, all_children,
10175 all_type_symtabs, iter, cust);
10179 /* Compute the compunit_symtab 'includes' fields for the compunit_symtab of
10183 compute_compunit_symtab_includes (struct dwarf2_per_cu_data *per_cu)
10185 gdb_assert (! per_cu->is_debug_types);
10187 if (!VEC_empty (dwarf2_per_cu_ptr, per_cu->imported_symtabs))
10190 struct dwarf2_per_cu_data *per_cu_iter;
10191 struct compunit_symtab *compunit_symtab_iter;
10192 VEC (compunit_symtab_ptr) *result_symtabs = NULL;
10193 htab_t all_children, all_type_symtabs;
10194 struct compunit_symtab *cust = get_compunit_symtab (per_cu);
10196 /* If we don't have a symtab, we can just skip this case. */
10200 all_children = htab_create_alloc (1, htab_hash_pointer, htab_eq_pointer,
10201 NULL, xcalloc, xfree);
10202 all_type_symtabs = htab_create_alloc (1, htab_hash_pointer, htab_eq_pointer,
10203 NULL, xcalloc, xfree);
10206 VEC_iterate (dwarf2_per_cu_ptr, per_cu->imported_symtabs,
10210 recursively_compute_inclusions (&result_symtabs, all_children,
10211 all_type_symtabs, per_cu_iter,
10215 /* Now we have a transitive closure of all the included symtabs. */
10216 len = VEC_length (compunit_symtab_ptr, result_symtabs);
10218 = XOBNEWVEC (&per_cu->dwarf2_per_objfile->objfile->objfile_obstack,
10219 struct compunit_symtab *, len + 1);
10221 VEC_iterate (compunit_symtab_ptr, result_symtabs, ix,
10222 compunit_symtab_iter);
10224 cust->includes[ix] = compunit_symtab_iter;
10225 cust->includes[len] = NULL;
10227 VEC_free (compunit_symtab_ptr, result_symtabs);
10228 htab_delete (all_children);
10229 htab_delete (all_type_symtabs);
10233 /* Compute the 'includes' field for the symtabs of all the CUs we just
10237 process_cu_includes (struct dwarf2_per_objfile *dwarf2_per_objfile)
10240 struct dwarf2_per_cu_data *iter;
10243 VEC_iterate (dwarf2_per_cu_ptr, dwarf2_per_objfile->just_read_cus,
10247 if (! iter->is_debug_types)
10248 compute_compunit_symtab_includes (iter);
10251 VEC_free (dwarf2_per_cu_ptr, dwarf2_per_objfile->just_read_cus);
10254 /* Generate full symbol information for PER_CU, whose DIEs have
10255 already been loaded into memory. */
10258 process_full_comp_unit (struct dwarf2_per_cu_data *per_cu,
10259 enum language pretend_language)
10261 struct dwarf2_cu *cu = per_cu->cu;
10262 struct dwarf2_per_objfile *dwarf2_per_objfile = per_cu->dwarf2_per_objfile;
10263 struct objfile *objfile = dwarf2_per_objfile->objfile;
10264 struct gdbarch *gdbarch = get_objfile_arch (objfile);
10265 CORE_ADDR lowpc, highpc;
10266 struct compunit_symtab *cust;
10267 CORE_ADDR baseaddr;
10268 struct block *static_block;
10271 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
10274 scoped_free_pendings free_pending;
10276 /* Clear the list here in case something was left over. */
10277 cu->method_list.clear ();
10279 cu->list_in_scope = &file_symbols;
10281 cu->language = pretend_language;
10282 cu->language_defn = language_def (cu->language);
10284 /* Do line number decoding in read_file_scope () */
10285 process_die (cu->dies, cu);
10287 /* For now fudge the Go package. */
10288 if (cu->language == language_go)
10289 fixup_go_packaging (cu);
10291 /* Now that we have processed all the DIEs in the CU, all the types
10292 should be complete, and it should now be safe to compute all of the
10294 compute_delayed_physnames (cu);
10296 if (cu->language == language_rust)
10297 rust_union_quirks (cu);
10299 /* Some compilers don't define a DW_AT_high_pc attribute for the
10300 compilation unit. If the DW_AT_high_pc is missing, synthesize
10301 it, by scanning the DIE's below the compilation unit. */
10302 get_scope_pc_bounds (cu->dies, &lowpc, &highpc, cu);
10304 addr = gdbarch_adjust_dwarf2_addr (gdbarch, highpc + baseaddr);
10305 static_block = end_symtab_get_static_block (addr, 0, 1);
10307 /* If the comp unit has DW_AT_ranges, it may have discontiguous ranges.
10308 Also, DW_AT_ranges may record ranges not belonging to any child DIEs
10309 (such as virtual method tables). Record the ranges in STATIC_BLOCK's
10310 addrmap to help ensure it has an accurate map of pc values belonging to
10312 dwarf2_record_block_ranges (cu->dies, static_block, baseaddr, cu);
10314 cust = end_symtab_from_static_block (static_block,
10315 SECT_OFF_TEXT (objfile), 0);
10319 int gcc_4_minor = producer_is_gcc_ge_4 (cu->producer);
10321 /* Set symtab language to language from DW_AT_language. If the
10322 compilation is from a C file generated by language preprocessors, do
10323 not set the language if it was already deduced by start_subfile. */
10324 if (!(cu->language == language_c
10325 && COMPUNIT_FILETABS (cust)->language != language_unknown))
10326 COMPUNIT_FILETABS (cust)->language = cu->language;
10328 /* GCC-4.0 has started to support -fvar-tracking. GCC-3.x still can
10329 produce DW_AT_location with location lists but it can be possibly
10330 invalid without -fvar-tracking. Still up to GCC-4.4.x incl. 4.4.0
10331 there were bugs in prologue debug info, fixed later in GCC-4.5
10332 by "unwind info for epilogues" patch (which is not directly related).
10334 For -gdwarf-4 type units LOCATIONS_VALID indication is fortunately not
10335 needed, it would be wrong due to missing DW_AT_producer there.
10337 Still one can confuse GDB by using non-standard GCC compilation
10338 options - this waits on GCC PR other/32998 (-frecord-gcc-switches).
10340 if (cu->has_loclist && gcc_4_minor >= 5)
10341 cust->locations_valid = 1;
10343 if (gcc_4_minor >= 5)
10344 cust->epilogue_unwind_valid = 1;
10346 cust->call_site_htab = cu->call_site_htab;
10349 if (dwarf2_per_objfile->using_index)
10350 per_cu->v.quick->compunit_symtab = cust;
10353 struct partial_symtab *pst = per_cu->v.psymtab;
10354 pst->compunit_symtab = cust;
10358 /* Push it for inclusion processing later. */
10359 VEC_safe_push (dwarf2_per_cu_ptr, dwarf2_per_objfile->just_read_cus, per_cu);
10362 /* Generate full symbol information for type unit PER_CU, whose DIEs have
10363 already been loaded into memory. */
10366 process_full_type_unit (struct dwarf2_per_cu_data *per_cu,
10367 enum language pretend_language)
10369 struct dwarf2_cu *cu = per_cu->cu;
10370 struct dwarf2_per_objfile *dwarf2_per_objfile = per_cu->dwarf2_per_objfile;
10371 struct objfile *objfile = dwarf2_per_objfile->objfile;
10372 struct compunit_symtab *cust;
10373 struct signatured_type *sig_type;
10375 gdb_assert (per_cu->is_debug_types);
10376 sig_type = (struct signatured_type *) per_cu;
10379 scoped_free_pendings free_pending;
10381 /* Clear the list here in case something was left over. */
10382 cu->method_list.clear ();
10384 cu->list_in_scope = &file_symbols;
10386 cu->language = pretend_language;
10387 cu->language_defn = language_def (cu->language);
10389 /* The symbol tables are set up in read_type_unit_scope. */
10390 process_die (cu->dies, cu);
10392 /* For now fudge the Go package. */
10393 if (cu->language == language_go)
10394 fixup_go_packaging (cu);
10396 /* Now that we have processed all the DIEs in the CU, all the types
10397 should be complete, and it should now be safe to compute all of the
10399 compute_delayed_physnames (cu);
10401 if (cu->language == language_rust)
10402 rust_union_quirks (cu);
10404 /* TUs share symbol tables.
10405 If this is the first TU to use this symtab, complete the construction
10406 of it with end_expandable_symtab. Otherwise, complete the addition of
10407 this TU's symbols to the existing symtab. */
10408 if (sig_type->type_unit_group->compunit_symtab == NULL)
10410 cust = end_expandable_symtab (0, SECT_OFF_TEXT (objfile));
10411 sig_type->type_unit_group->compunit_symtab = cust;
10415 /* Set symtab language to language from DW_AT_language. If the
10416 compilation is from a C file generated by language preprocessors,
10417 do not set the language if it was already deduced by
10419 if (!(cu->language == language_c
10420 && COMPUNIT_FILETABS (cust)->language != language_c))
10421 COMPUNIT_FILETABS (cust)->language = cu->language;
10426 augment_type_symtab ();
10427 cust = sig_type->type_unit_group->compunit_symtab;
10430 if (dwarf2_per_objfile->using_index)
10431 per_cu->v.quick->compunit_symtab = cust;
10434 struct partial_symtab *pst = per_cu->v.psymtab;
10435 pst->compunit_symtab = cust;
10440 /* Process an imported unit DIE. */
10443 process_imported_unit_die (struct die_info *die, struct dwarf2_cu *cu)
10445 struct attribute *attr;
10447 /* For now we don't handle imported units in type units. */
10448 if (cu->per_cu->is_debug_types)
10450 error (_("Dwarf Error: DW_TAG_imported_unit is not"
10451 " supported in type units [in module %s]"),
10452 objfile_name (cu->per_cu->dwarf2_per_objfile->objfile));
10455 attr = dwarf2_attr (die, DW_AT_import, cu);
10458 sect_offset sect_off = dwarf2_get_ref_die_offset (attr);
10459 bool is_dwz = (attr->form == DW_FORM_GNU_ref_alt || cu->per_cu->is_dwz);
10460 dwarf2_per_cu_data *per_cu
10461 = dwarf2_find_containing_comp_unit (sect_off, is_dwz,
10462 cu->per_cu->dwarf2_per_objfile);
10464 /* If necessary, add it to the queue and load its DIEs. */
10465 if (maybe_queue_comp_unit (cu, per_cu, cu->language))
10466 load_full_comp_unit (per_cu, false, cu->language);
10468 VEC_safe_push (dwarf2_per_cu_ptr, cu->per_cu->imported_symtabs,
10473 /* RAII object that represents a process_die scope: i.e.,
10474 starts/finishes processing a DIE. */
10475 class process_die_scope
10478 process_die_scope (die_info *die, dwarf2_cu *cu)
10479 : m_die (die), m_cu (cu)
10481 /* We should only be processing DIEs not already in process. */
10482 gdb_assert (!m_die->in_process);
10483 m_die->in_process = true;
10486 ~process_die_scope ()
10488 m_die->in_process = false;
10490 /* If we're done processing the DIE for the CU that owns the line
10491 header, we don't need the line header anymore. */
10492 if (m_cu->line_header_die_owner == m_die)
10494 delete m_cu->line_header;
10495 m_cu->line_header = NULL;
10496 m_cu->line_header_die_owner = NULL;
10505 /* Process a die and its children. */
10508 process_die (struct die_info *die, struct dwarf2_cu *cu)
10510 process_die_scope scope (die, cu);
10514 case DW_TAG_padding:
10516 case DW_TAG_compile_unit:
10517 case DW_TAG_partial_unit:
10518 read_file_scope (die, cu);
10520 case DW_TAG_type_unit:
10521 read_type_unit_scope (die, cu);
10523 case DW_TAG_subprogram:
10524 case DW_TAG_inlined_subroutine:
10525 read_func_scope (die, cu);
10527 case DW_TAG_lexical_block:
10528 case DW_TAG_try_block:
10529 case DW_TAG_catch_block:
10530 read_lexical_block_scope (die, cu);
10532 case DW_TAG_call_site:
10533 case DW_TAG_GNU_call_site:
10534 read_call_site_scope (die, cu);
10536 case DW_TAG_class_type:
10537 case DW_TAG_interface_type:
10538 case DW_TAG_structure_type:
10539 case DW_TAG_union_type:
10540 process_structure_scope (die, cu);
10542 case DW_TAG_enumeration_type:
10543 process_enumeration_scope (die, cu);
10546 /* These dies have a type, but processing them does not create
10547 a symbol or recurse to process the children. Therefore we can
10548 read them on-demand through read_type_die. */
10549 case DW_TAG_subroutine_type:
10550 case DW_TAG_set_type:
10551 case DW_TAG_array_type:
10552 case DW_TAG_pointer_type:
10553 case DW_TAG_ptr_to_member_type:
10554 case DW_TAG_reference_type:
10555 case DW_TAG_rvalue_reference_type:
10556 case DW_TAG_string_type:
10559 case DW_TAG_base_type:
10560 case DW_TAG_subrange_type:
10561 case DW_TAG_typedef:
10562 /* Add a typedef symbol for the type definition, if it has a
10564 new_symbol (die, read_type_die (die, cu), cu);
10566 case DW_TAG_common_block:
10567 read_common_block (die, cu);
10569 case DW_TAG_common_inclusion:
10571 case DW_TAG_namespace:
10572 cu->processing_has_namespace_info = 1;
10573 read_namespace (die, cu);
10575 case DW_TAG_module:
10576 cu->processing_has_namespace_info = 1;
10577 read_module (die, cu);
10579 case DW_TAG_imported_declaration:
10580 cu->processing_has_namespace_info = 1;
10581 if (read_namespace_alias (die, cu))
10583 /* The declaration is not a global namespace alias. */
10584 /* Fall through. */
10585 case DW_TAG_imported_module:
10586 cu->processing_has_namespace_info = 1;
10587 if (die->child != NULL && (die->tag == DW_TAG_imported_declaration
10588 || cu->language != language_fortran))
10589 complaint (&symfile_complaints, _("Tag '%s' has unexpected children"),
10590 dwarf_tag_name (die->tag));
10591 read_import_statement (die, cu);
10594 case DW_TAG_imported_unit:
10595 process_imported_unit_die (die, cu);
10598 case DW_TAG_variable:
10599 read_variable (die, cu);
10603 new_symbol (die, NULL, cu);
10608 /* DWARF name computation. */
10610 /* A helper function for dwarf2_compute_name which determines whether DIE
10611 needs to have the name of the scope prepended to the name listed in the
10615 die_needs_namespace (struct die_info *die, struct dwarf2_cu *cu)
10617 struct attribute *attr;
10621 case DW_TAG_namespace:
10622 case DW_TAG_typedef:
10623 case DW_TAG_class_type:
10624 case DW_TAG_interface_type:
10625 case DW_TAG_structure_type:
10626 case DW_TAG_union_type:
10627 case DW_TAG_enumeration_type:
10628 case DW_TAG_enumerator:
10629 case DW_TAG_subprogram:
10630 case DW_TAG_inlined_subroutine:
10631 case DW_TAG_member:
10632 case DW_TAG_imported_declaration:
10635 case DW_TAG_variable:
10636 case DW_TAG_constant:
10637 /* We only need to prefix "globally" visible variables. These include
10638 any variable marked with DW_AT_external or any variable that
10639 lives in a namespace. [Variables in anonymous namespaces
10640 require prefixing, but they are not DW_AT_external.] */
10642 if (dwarf2_attr (die, DW_AT_specification, cu))
10644 struct dwarf2_cu *spec_cu = cu;
10646 return die_needs_namespace (die_specification (die, &spec_cu),
10650 attr = dwarf2_attr (die, DW_AT_external, cu);
10651 if (attr == NULL && die->parent->tag != DW_TAG_namespace
10652 && die->parent->tag != DW_TAG_module)
10654 /* A variable in a lexical block of some kind does not need a
10655 namespace, even though in C++ such variables may be external
10656 and have a mangled name. */
10657 if (die->parent->tag == DW_TAG_lexical_block
10658 || die->parent->tag == DW_TAG_try_block
10659 || die->parent->tag == DW_TAG_catch_block
10660 || die->parent->tag == DW_TAG_subprogram)
10669 /* Return the DIE's linkage name attribute, either DW_AT_linkage_name
10670 or DW_AT_MIPS_linkage_name. Returns NULL if the attribute is not
10671 defined for the given DIE. */
10673 static struct attribute *
10674 dw2_linkage_name_attr (struct die_info *die, struct dwarf2_cu *cu)
10676 struct attribute *attr;
10678 attr = dwarf2_attr (die, DW_AT_linkage_name, cu);
10680 attr = dwarf2_attr (die, DW_AT_MIPS_linkage_name, cu);
10685 /* Return the DIE's linkage name as a string, either DW_AT_linkage_name
10686 or DW_AT_MIPS_linkage_name. Returns NULL if the attribute is not
10687 defined for the given DIE. */
10689 static const char *
10690 dw2_linkage_name (struct die_info *die, struct dwarf2_cu *cu)
10692 const char *linkage_name;
10694 linkage_name = dwarf2_string_attr (die, DW_AT_linkage_name, cu);
10695 if (linkage_name == NULL)
10696 linkage_name = dwarf2_string_attr (die, DW_AT_MIPS_linkage_name, cu);
10698 return linkage_name;
10701 /* Compute the fully qualified name of DIE in CU. If PHYSNAME is nonzero,
10702 compute the physname for the object, which include a method's:
10703 - formal parameters (C++),
10704 - receiver type (Go),
10706 The term "physname" is a bit confusing.
10707 For C++, for example, it is the demangled name.
10708 For Go, for example, it's the mangled name.
10710 For Ada, return the DIE's linkage name rather than the fully qualified
10711 name. PHYSNAME is ignored..
10713 The result is allocated on the objfile_obstack and canonicalized. */
10715 static const char *
10716 dwarf2_compute_name (const char *name,
10717 struct die_info *die, struct dwarf2_cu *cu,
10720 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
10723 name = dwarf2_name (die, cu);
10725 /* For Fortran GDB prefers DW_AT_*linkage_name for the physname if present
10726 but otherwise compute it by typename_concat inside GDB.
10727 FIXME: Actually this is not really true, or at least not always true.
10728 It's all very confusing. SYMBOL_SET_NAMES doesn't try to demangle
10729 Fortran names because there is no mangling standard. So new_symbol
10730 will set the demangled name to the result of dwarf2_full_name, and it is
10731 the demangled name that GDB uses if it exists. */
10732 if (cu->language == language_ada
10733 || (cu->language == language_fortran && physname))
10735 /* For Ada unit, we prefer the linkage name over the name, as
10736 the former contains the exported name, which the user expects
10737 to be able to reference. Ideally, we want the user to be able
10738 to reference this entity using either natural or linkage name,
10739 but we haven't started looking at this enhancement yet. */
10740 const char *linkage_name = dw2_linkage_name (die, cu);
10742 if (linkage_name != NULL)
10743 return linkage_name;
10746 /* These are the only languages we know how to qualify names in. */
10748 && (cu->language == language_cplus
10749 || cu->language == language_fortran || cu->language == language_d
10750 || cu->language == language_rust))
10752 if (die_needs_namespace (die, cu))
10754 const char *prefix;
10755 const char *canonical_name = NULL;
10759 prefix = determine_prefix (die, cu);
10760 if (*prefix != '\0')
10762 char *prefixed_name = typename_concat (NULL, prefix, name,
10765 buf.puts (prefixed_name);
10766 xfree (prefixed_name);
10771 /* Template parameters may be specified in the DIE's DW_AT_name, or
10772 as children with DW_TAG_template_type_param or
10773 DW_TAG_value_type_param. If the latter, add them to the name
10774 here. If the name already has template parameters, then
10775 skip this step; some versions of GCC emit both, and
10776 it is more efficient to use the pre-computed name.
10778 Something to keep in mind about this process: it is very
10779 unlikely, or in some cases downright impossible, to produce
10780 something that will match the mangled name of a function.
10781 If the definition of the function has the same debug info,
10782 we should be able to match up with it anyway. But fallbacks
10783 using the minimal symbol, for instance to find a method
10784 implemented in a stripped copy of libstdc++, will not work.
10785 If we do not have debug info for the definition, we will have to
10786 match them up some other way.
10788 When we do name matching there is a related problem with function
10789 templates; two instantiated function templates are allowed to
10790 differ only by their return types, which we do not add here. */
10792 if (cu->language == language_cplus && strchr (name, '<') == NULL)
10794 struct attribute *attr;
10795 struct die_info *child;
10798 die->building_fullname = 1;
10800 for (child = die->child; child != NULL; child = child->sibling)
10804 const gdb_byte *bytes;
10805 struct dwarf2_locexpr_baton *baton;
10808 if (child->tag != DW_TAG_template_type_param
10809 && child->tag != DW_TAG_template_value_param)
10820 attr = dwarf2_attr (child, DW_AT_type, cu);
10823 complaint (&symfile_complaints,
10824 _("template parameter missing DW_AT_type"));
10825 buf.puts ("UNKNOWN_TYPE");
10828 type = die_type (child, cu);
10830 if (child->tag == DW_TAG_template_type_param)
10832 c_print_type (type, "", &buf, -1, 0, &type_print_raw_options);
10836 attr = dwarf2_attr (child, DW_AT_const_value, cu);
10839 complaint (&symfile_complaints,
10840 _("template parameter missing "
10841 "DW_AT_const_value"));
10842 buf.puts ("UNKNOWN_VALUE");
10846 dwarf2_const_value_attr (attr, type, name,
10847 &cu->comp_unit_obstack, cu,
10848 &value, &bytes, &baton);
10850 if (TYPE_NOSIGN (type))
10851 /* GDB prints characters as NUMBER 'CHAR'. If that's
10852 changed, this can use value_print instead. */
10853 c_printchar (value, type, &buf);
10856 struct value_print_options opts;
10859 v = dwarf2_evaluate_loc_desc (type, NULL,
10863 else if (bytes != NULL)
10865 v = allocate_value (type);
10866 memcpy (value_contents_writeable (v), bytes,
10867 TYPE_LENGTH (type));
10870 v = value_from_longest (type, value);
10872 /* Specify decimal so that we do not depend on
10874 get_formatted_print_options (&opts, 'd');
10876 value_print (v, &buf, &opts);
10881 die->building_fullname = 0;
10885 /* Close the argument list, with a space if necessary
10886 (nested templates). */
10887 if (!buf.empty () && buf.string ().back () == '>')
10894 /* For C++ methods, append formal parameter type
10895 information, if PHYSNAME. */
10897 if (physname && die->tag == DW_TAG_subprogram
10898 && cu->language == language_cplus)
10900 struct type *type = read_type_die (die, cu);
10902 c_type_print_args (type, &buf, 1, cu->language,
10903 &type_print_raw_options);
10905 if (cu->language == language_cplus)
10907 /* Assume that an artificial first parameter is
10908 "this", but do not crash if it is not. RealView
10909 marks unnamed (and thus unused) parameters as
10910 artificial; there is no way to differentiate
10912 if (TYPE_NFIELDS (type) > 0
10913 && TYPE_FIELD_ARTIFICIAL (type, 0)
10914 && TYPE_CODE (TYPE_FIELD_TYPE (type, 0)) == TYPE_CODE_PTR
10915 && TYPE_CONST (TYPE_TARGET_TYPE (TYPE_FIELD_TYPE (type,
10917 buf.puts (" const");
10921 const std::string &intermediate_name = buf.string ();
10923 if (cu->language == language_cplus)
10925 = dwarf2_canonicalize_name (intermediate_name.c_str (), cu,
10926 &objfile->per_bfd->storage_obstack);
10928 /* If we only computed INTERMEDIATE_NAME, or if
10929 INTERMEDIATE_NAME is already canonical, then we need to
10930 copy it to the appropriate obstack. */
10931 if (canonical_name == NULL || canonical_name == intermediate_name.c_str ())
10932 name = ((const char *)
10933 obstack_copy0 (&objfile->per_bfd->storage_obstack,
10934 intermediate_name.c_str (),
10935 intermediate_name.length ()));
10937 name = canonical_name;
10944 /* Return the fully qualified name of DIE, based on its DW_AT_name.
10945 If scope qualifiers are appropriate they will be added. The result
10946 will be allocated on the storage_obstack, or NULL if the DIE does
10947 not have a name. NAME may either be from a previous call to
10948 dwarf2_name or NULL.
10950 The output string will be canonicalized (if C++). */
10952 static const char *
10953 dwarf2_full_name (const char *name, struct die_info *die, struct dwarf2_cu *cu)
10955 return dwarf2_compute_name (name, die, cu, 0);
10958 /* Construct a physname for the given DIE in CU. NAME may either be
10959 from a previous call to dwarf2_name or NULL. The result will be
10960 allocated on the objfile_objstack or NULL if the DIE does not have a
10963 The output string will be canonicalized (if C++). */
10965 static const char *
10966 dwarf2_physname (const char *name, struct die_info *die, struct dwarf2_cu *cu)
10968 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
10969 const char *retval, *mangled = NULL, *canon = NULL;
10972 /* In this case dwarf2_compute_name is just a shortcut not building anything
10974 if (!die_needs_namespace (die, cu))
10975 return dwarf2_compute_name (name, die, cu, 1);
10977 mangled = dw2_linkage_name (die, cu);
10979 /* rustc emits invalid values for DW_AT_linkage_name. Ignore these.
10980 See https://github.com/rust-lang/rust/issues/32925. */
10981 if (cu->language == language_rust && mangled != NULL
10982 && strchr (mangled, '{') != NULL)
10985 /* DW_AT_linkage_name is missing in some cases - depend on what GDB
10987 gdb::unique_xmalloc_ptr<char> demangled;
10988 if (mangled != NULL)
10991 if (language_def (cu->language)->la_store_sym_names_in_linkage_form_p)
10993 /* Do nothing (do not demangle the symbol name). */
10995 else if (cu->language == language_go)
10997 /* This is a lie, but we already lie to the caller new_symbol.
10998 new_symbol assumes we return the mangled name.
10999 This just undoes that lie until things are cleaned up. */
11003 /* Use DMGL_RET_DROP for C++ template functions to suppress
11004 their return type. It is easier for GDB users to search
11005 for such functions as `name(params)' than `long name(params)'.
11006 In such case the minimal symbol names do not match the full
11007 symbol names but for template functions there is never a need
11008 to look up their definition from their declaration so
11009 the only disadvantage remains the minimal symbol variant
11010 `long name(params)' does not have the proper inferior type. */
11011 demangled.reset (gdb_demangle (mangled,
11012 (DMGL_PARAMS | DMGL_ANSI
11013 | DMGL_RET_DROP)));
11016 canon = demangled.get ();
11024 if (canon == NULL || check_physname)
11026 const char *physname = dwarf2_compute_name (name, die, cu, 1);
11028 if (canon != NULL && strcmp (physname, canon) != 0)
11030 /* It may not mean a bug in GDB. The compiler could also
11031 compute DW_AT_linkage_name incorrectly. But in such case
11032 GDB would need to be bug-to-bug compatible. */
11034 complaint (&symfile_complaints,
11035 _("Computed physname <%s> does not match demangled <%s> "
11036 "(from linkage <%s>) - DIE at %s [in module %s]"),
11037 physname, canon, mangled, sect_offset_str (die->sect_off),
11038 objfile_name (objfile));
11040 /* Prefer DW_AT_linkage_name (in the CANON form) - when it
11041 is available here - over computed PHYSNAME. It is safer
11042 against both buggy GDB and buggy compilers. */
11056 retval = ((const char *)
11057 obstack_copy0 (&objfile->per_bfd->storage_obstack,
11058 retval, strlen (retval)));
11063 /* Inspect DIE in CU for a namespace alias. If one exists, record
11064 a new symbol for it.
11066 Returns 1 if a namespace alias was recorded, 0 otherwise. */
11069 read_namespace_alias (struct die_info *die, struct dwarf2_cu *cu)
11071 struct attribute *attr;
11073 /* If the die does not have a name, this is not a namespace
11075 attr = dwarf2_attr (die, DW_AT_name, cu);
11079 struct die_info *d = die;
11080 struct dwarf2_cu *imported_cu = cu;
11082 /* If the compiler has nested DW_AT_imported_declaration DIEs,
11083 keep inspecting DIEs until we hit the underlying import. */
11084 #define MAX_NESTED_IMPORTED_DECLARATIONS 100
11085 for (num = 0; num < MAX_NESTED_IMPORTED_DECLARATIONS; ++num)
11087 attr = dwarf2_attr (d, DW_AT_import, cu);
11091 d = follow_die_ref (d, attr, &imported_cu);
11092 if (d->tag != DW_TAG_imported_declaration)
11096 if (num == MAX_NESTED_IMPORTED_DECLARATIONS)
11098 complaint (&symfile_complaints,
11099 _("DIE at %s has too many recursively imported "
11100 "declarations"), sect_offset_str (d->sect_off));
11107 sect_offset sect_off = dwarf2_get_ref_die_offset (attr);
11109 type = get_die_type_at_offset (sect_off, cu->per_cu);
11110 if (type != NULL && TYPE_CODE (type) == TYPE_CODE_NAMESPACE)
11112 /* This declaration is a global namespace alias. Add
11113 a symbol for it whose type is the aliased namespace. */
11114 new_symbol (die, type, cu);
11123 /* Return the using directives repository (global or local?) to use in the
11124 current context for LANGUAGE.
11126 For Ada, imported declarations can materialize renamings, which *may* be
11127 global. However it is impossible (for now?) in DWARF to distinguish
11128 "external" imported declarations and "static" ones. As all imported
11129 declarations seem to be static in all other languages, make them all CU-wide
11130 global only in Ada. */
11132 static struct using_direct **
11133 using_directives (enum language language)
11135 if (language == language_ada && context_stack_depth == 0)
11136 return &global_using_directives;
11138 return &local_using_directives;
11141 /* Read the import statement specified by the given die and record it. */
11144 read_import_statement (struct die_info *die, struct dwarf2_cu *cu)
11146 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
11147 struct attribute *import_attr;
11148 struct die_info *imported_die, *child_die;
11149 struct dwarf2_cu *imported_cu;
11150 const char *imported_name;
11151 const char *imported_name_prefix;
11152 const char *canonical_name;
11153 const char *import_alias;
11154 const char *imported_declaration = NULL;
11155 const char *import_prefix;
11156 std::vector<const char *> excludes;
11158 import_attr = dwarf2_attr (die, DW_AT_import, cu);
11159 if (import_attr == NULL)
11161 complaint (&symfile_complaints, _("Tag '%s' has no DW_AT_import"),
11162 dwarf_tag_name (die->tag));
11167 imported_die = follow_die_ref_or_sig (die, import_attr, &imported_cu);
11168 imported_name = dwarf2_name (imported_die, imported_cu);
11169 if (imported_name == NULL)
11171 /* GCC bug: https://bugzilla.redhat.com/show_bug.cgi?id=506524
11173 The import in the following code:
11187 <2><51>: Abbrev Number: 3 (DW_TAG_imported_declaration)
11188 <52> DW_AT_decl_file : 1
11189 <53> DW_AT_decl_line : 6
11190 <54> DW_AT_import : <0x75>
11191 <2><58>: Abbrev Number: 4 (DW_TAG_typedef)
11192 <59> DW_AT_name : B
11193 <5b> DW_AT_decl_file : 1
11194 <5c> DW_AT_decl_line : 2
11195 <5d> DW_AT_type : <0x6e>
11197 <1><75>: Abbrev Number: 7 (DW_TAG_base_type)
11198 <76> DW_AT_byte_size : 4
11199 <77> DW_AT_encoding : 5 (signed)
11201 imports the wrong die ( 0x75 instead of 0x58 ).
11202 This case will be ignored until the gcc bug is fixed. */
11206 /* Figure out the local name after import. */
11207 import_alias = dwarf2_name (die, cu);
11209 /* Figure out where the statement is being imported to. */
11210 import_prefix = determine_prefix (die, cu);
11212 /* Figure out what the scope of the imported die is and prepend it
11213 to the name of the imported die. */
11214 imported_name_prefix = determine_prefix (imported_die, imported_cu);
11216 if (imported_die->tag != DW_TAG_namespace
11217 && imported_die->tag != DW_TAG_module)
11219 imported_declaration = imported_name;
11220 canonical_name = imported_name_prefix;
11222 else if (strlen (imported_name_prefix) > 0)
11223 canonical_name = obconcat (&objfile->objfile_obstack,
11224 imported_name_prefix,
11225 (cu->language == language_d ? "." : "::"),
11226 imported_name, (char *) NULL);
11228 canonical_name = imported_name;
11230 if (die->tag == DW_TAG_imported_module && cu->language == language_fortran)
11231 for (child_die = die->child; child_die && child_die->tag;
11232 child_die = sibling_die (child_die))
11234 /* DWARF-4: A Fortran use statement with a “rename list” may be
11235 represented by an imported module entry with an import attribute
11236 referring to the module and owned entries corresponding to those
11237 entities that are renamed as part of being imported. */
11239 if (child_die->tag != DW_TAG_imported_declaration)
11241 complaint (&symfile_complaints,
11242 _("child DW_TAG_imported_declaration expected "
11243 "- DIE at %s [in module %s]"),
11244 sect_offset_str (child_die->sect_off),
11245 objfile_name (objfile));
11249 import_attr = dwarf2_attr (child_die, DW_AT_import, cu);
11250 if (import_attr == NULL)
11252 complaint (&symfile_complaints, _("Tag '%s' has no DW_AT_import"),
11253 dwarf_tag_name (child_die->tag));
11258 imported_die = follow_die_ref_or_sig (child_die, import_attr,
11260 imported_name = dwarf2_name (imported_die, imported_cu);
11261 if (imported_name == NULL)
11263 complaint (&symfile_complaints,
11264 _("child DW_TAG_imported_declaration has unknown "
11265 "imported name - DIE at %s [in module %s]"),
11266 sect_offset_str (child_die->sect_off),
11267 objfile_name (objfile));
11271 excludes.push_back (imported_name);
11273 process_die (child_die, cu);
11276 add_using_directive (using_directives (cu->language),
11280 imported_declaration,
11283 &objfile->objfile_obstack);
11286 /* ICC<14 does not output the required DW_AT_declaration on incomplete
11287 types, but gives them a size of zero. Starting with version 14,
11288 ICC is compatible with GCC. */
11291 producer_is_icc_lt_14 (struct dwarf2_cu *cu)
11293 if (!cu->checked_producer)
11294 check_producer (cu);
11296 return cu->producer_is_icc_lt_14;
11299 /* Check for possibly missing DW_AT_comp_dir with relative .debug_line
11300 directory paths. GCC SVN r127613 (new option -fdebug-prefix-map) fixed
11301 this, it was first present in GCC release 4.3.0. */
11304 producer_is_gcc_lt_4_3 (struct dwarf2_cu *cu)
11306 if (!cu->checked_producer)
11307 check_producer (cu);
11309 return cu->producer_is_gcc_lt_4_3;
11312 static file_and_directory
11313 find_file_and_directory (struct die_info *die, struct dwarf2_cu *cu)
11315 file_and_directory res;
11317 /* Find the filename. Do not use dwarf2_name here, since the filename
11318 is not a source language identifier. */
11319 res.name = dwarf2_string_attr (die, DW_AT_name, cu);
11320 res.comp_dir = dwarf2_string_attr (die, DW_AT_comp_dir, cu);
11322 if (res.comp_dir == NULL
11323 && producer_is_gcc_lt_4_3 (cu) && res.name != NULL
11324 && IS_ABSOLUTE_PATH (res.name))
11326 res.comp_dir_storage = ldirname (res.name);
11327 if (!res.comp_dir_storage.empty ())
11328 res.comp_dir = res.comp_dir_storage.c_str ();
11330 if (res.comp_dir != NULL)
11332 /* Irix 6.2 native cc prepends <machine>.: to the compilation
11333 directory, get rid of it. */
11334 const char *cp = strchr (res.comp_dir, ':');
11336 if (cp && cp != res.comp_dir && cp[-1] == '.' && cp[1] == '/')
11337 res.comp_dir = cp + 1;
11340 if (res.name == NULL)
11341 res.name = "<unknown>";
11346 /* Handle DW_AT_stmt_list for a compilation unit.
11347 DIE is the DW_TAG_compile_unit die for CU.
11348 COMP_DIR is the compilation directory. LOWPC is passed to
11349 dwarf_decode_lines. See dwarf_decode_lines comments about it. */
11352 handle_DW_AT_stmt_list (struct die_info *die, struct dwarf2_cu *cu,
11353 const char *comp_dir, CORE_ADDR lowpc) /* ARI: editCase function */
11355 struct dwarf2_per_objfile *dwarf2_per_objfile
11356 = cu->per_cu->dwarf2_per_objfile;
11357 struct objfile *objfile = dwarf2_per_objfile->objfile;
11358 struct attribute *attr;
11359 struct line_header line_header_local;
11360 hashval_t line_header_local_hash;
11362 int decode_mapping;
11364 gdb_assert (! cu->per_cu->is_debug_types);
11366 attr = dwarf2_attr (die, DW_AT_stmt_list, cu);
11370 sect_offset line_offset = (sect_offset) DW_UNSND (attr);
11372 /* The line header hash table is only created if needed (it exists to
11373 prevent redundant reading of the line table for partial_units).
11374 If we're given a partial_unit, we'll need it. If we're given a
11375 compile_unit, then use the line header hash table if it's already
11376 created, but don't create one just yet. */
11378 if (dwarf2_per_objfile->line_header_hash == NULL
11379 && die->tag == DW_TAG_partial_unit)
11381 dwarf2_per_objfile->line_header_hash
11382 = htab_create_alloc_ex (127, line_header_hash_voidp,
11383 line_header_eq_voidp,
11384 free_line_header_voidp,
11385 &objfile->objfile_obstack,
11386 hashtab_obstack_allocate,
11387 dummy_obstack_deallocate);
11390 line_header_local.sect_off = line_offset;
11391 line_header_local.offset_in_dwz = cu->per_cu->is_dwz;
11392 line_header_local_hash = line_header_hash (&line_header_local);
11393 if (dwarf2_per_objfile->line_header_hash != NULL)
11395 slot = htab_find_slot_with_hash (dwarf2_per_objfile->line_header_hash,
11396 &line_header_local,
11397 line_header_local_hash, NO_INSERT);
11399 /* For DW_TAG_compile_unit we need info like symtab::linetable which
11400 is not present in *SLOT (since if there is something in *SLOT then
11401 it will be for a partial_unit). */
11402 if (die->tag == DW_TAG_partial_unit && slot != NULL)
11404 gdb_assert (*slot != NULL);
11405 cu->line_header = (struct line_header *) *slot;
11410 /* dwarf_decode_line_header does not yet provide sufficient information.
11411 We always have to call also dwarf_decode_lines for it. */
11412 line_header_up lh = dwarf_decode_line_header (line_offset, cu);
11416 cu->line_header = lh.release ();
11417 cu->line_header_die_owner = die;
11419 if (dwarf2_per_objfile->line_header_hash == NULL)
11423 slot = htab_find_slot_with_hash (dwarf2_per_objfile->line_header_hash,
11424 &line_header_local,
11425 line_header_local_hash, INSERT);
11426 gdb_assert (slot != NULL);
11428 if (slot != NULL && *slot == NULL)
11430 /* This newly decoded line number information unit will be owned
11431 by line_header_hash hash table. */
11432 *slot = cu->line_header;
11433 cu->line_header_die_owner = NULL;
11437 /* We cannot free any current entry in (*slot) as that struct line_header
11438 may be already used by multiple CUs. Create only temporary decoded
11439 line_header for this CU - it may happen at most once for each line
11440 number information unit. And if we're not using line_header_hash
11441 then this is what we want as well. */
11442 gdb_assert (die->tag != DW_TAG_partial_unit);
11444 decode_mapping = (die->tag != DW_TAG_partial_unit);
11445 dwarf_decode_lines (cu->line_header, comp_dir, cu, NULL, lowpc,
11450 /* Process DW_TAG_compile_unit or DW_TAG_partial_unit. */
11453 read_file_scope (struct die_info *die, struct dwarf2_cu *cu)
11455 struct dwarf2_per_objfile *dwarf2_per_objfile
11456 = cu->per_cu->dwarf2_per_objfile;
11457 struct objfile *objfile = dwarf2_per_objfile->objfile;
11458 struct gdbarch *gdbarch = get_objfile_arch (objfile);
11459 CORE_ADDR lowpc = ((CORE_ADDR) -1);
11460 CORE_ADDR highpc = ((CORE_ADDR) 0);
11461 struct attribute *attr;
11462 struct die_info *child_die;
11463 CORE_ADDR baseaddr;
11465 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
11467 get_scope_pc_bounds (die, &lowpc, &highpc, cu);
11469 /* If we didn't find a lowpc, set it to highpc to avoid complaints
11470 from finish_block. */
11471 if (lowpc == ((CORE_ADDR) -1))
11473 lowpc = gdbarch_adjust_dwarf2_addr (gdbarch, lowpc + baseaddr);
11475 file_and_directory fnd = find_file_and_directory (die, cu);
11477 prepare_one_comp_unit (cu, die, cu->language);
11479 /* The XLCL doesn't generate DW_LANG_OpenCL because this attribute is not
11480 standardised yet. As a workaround for the language detection we fall
11481 back to the DW_AT_producer string. */
11482 if (cu->producer && strstr (cu->producer, "IBM XL C for OpenCL") != NULL)
11483 cu->language = language_opencl;
11485 /* Similar hack for Go. */
11486 if (cu->producer && strstr (cu->producer, "GNU Go ") != NULL)
11487 set_cu_language (DW_LANG_Go, cu);
11489 dwarf2_start_symtab (cu, fnd.name, fnd.comp_dir, lowpc);
11491 /* Decode line number information if present. We do this before
11492 processing child DIEs, so that the line header table is available
11493 for DW_AT_decl_file. */
11494 handle_DW_AT_stmt_list (die, cu, fnd.comp_dir, lowpc);
11496 /* Process all dies in compilation unit. */
11497 if (die->child != NULL)
11499 child_die = die->child;
11500 while (child_die && child_die->tag)
11502 process_die (child_die, cu);
11503 child_die = sibling_die (child_die);
11507 /* Decode macro information, if present. Dwarf 2 macro information
11508 refers to information in the line number info statement program
11509 header, so we can only read it if we've read the header
11511 attr = dwarf2_attr (die, DW_AT_macros, cu);
11513 attr = dwarf2_attr (die, DW_AT_GNU_macros, cu);
11514 if (attr && cu->line_header)
11516 if (dwarf2_attr (die, DW_AT_macro_info, cu))
11517 complaint (&symfile_complaints,
11518 _("CU refers to both DW_AT_macros and DW_AT_macro_info"));
11520 dwarf_decode_macros (cu, DW_UNSND (attr), 1);
11524 attr = dwarf2_attr (die, DW_AT_macro_info, cu);
11525 if (attr && cu->line_header)
11527 unsigned int macro_offset = DW_UNSND (attr);
11529 dwarf_decode_macros (cu, macro_offset, 0);
11534 /* TU version of handle_DW_AT_stmt_list for read_type_unit_scope.
11535 Create the set of symtabs used by this TU, or if this TU is sharing
11536 symtabs with another TU and the symtabs have already been created
11537 then restore those symtabs in the line header.
11538 We don't need the pc/line-number mapping for type units. */
11541 setup_type_unit_groups (struct die_info *die, struct dwarf2_cu *cu)
11543 struct dwarf2_per_cu_data *per_cu = cu->per_cu;
11544 struct type_unit_group *tu_group;
11546 struct attribute *attr;
11548 struct signatured_type *sig_type;
11550 gdb_assert (per_cu->is_debug_types);
11551 sig_type = (struct signatured_type *) per_cu;
11553 attr = dwarf2_attr (die, DW_AT_stmt_list, cu);
11555 /* If we're using .gdb_index (includes -readnow) then
11556 per_cu->type_unit_group may not have been set up yet. */
11557 if (sig_type->type_unit_group == NULL)
11558 sig_type->type_unit_group = get_type_unit_group (cu, attr);
11559 tu_group = sig_type->type_unit_group;
11561 /* If we've already processed this stmt_list there's no real need to
11562 do it again, we could fake it and just recreate the part we need
11563 (file name,index -> symtab mapping). If data shows this optimization
11564 is useful we can do it then. */
11565 first_time = tu_group->compunit_symtab == NULL;
11567 /* We have to handle the case of both a missing DW_AT_stmt_list or bad
11572 sect_offset line_offset = (sect_offset) DW_UNSND (attr);
11573 lh = dwarf_decode_line_header (line_offset, cu);
11578 dwarf2_start_symtab (cu, "", NULL, 0);
11581 gdb_assert (tu_group->symtabs == NULL);
11582 restart_symtab (tu_group->compunit_symtab, "", 0);
11587 cu->line_header = lh.release ();
11588 cu->line_header_die_owner = die;
11592 struct compunit_symtab *cust = dwarf2_start_symtab (cu, "", NULL, 0);
11594 /* Note: We don't assign tu_group->compunit_symtab yet because we're
11595 still initializing it, and our caller (a few levels up)
11596 process_full_type_unit still needs to know if this is the first
11599 tu_group->num_symtabs = cu->line_header->file_names.size ();
11600 tu_group->symtabs = XNEWVEC (struct symtab *,
11601 cu->line_header->file_names.size ());
11603 for (i = 0; i < cu->line_header->file_names.size (); ++i)
11605 file_entry &fe = cu->line_header->file_names[i];
11607 dwarf2_start_subfile (fe.name, fe.include_dir (cu->line_header));
11609 if (current_subfile->symtab == NULL)
11611 /* NOTE: start_subfile will recognize when it's been
11612 passed a file it has already seen. So we can't
11613 assume there's a simple mapping from
11614 cu->line_header->file_names to subfiles, plus
11615 cu->line_header->file_names may contain dups. */
11616 current_subfile->symtab
11617 = allocate_symtab (cust, current_subfile->name);
11620 fe.symtab = current_subfile->symtab;
11621 tu_group->symtabs[i] = fe.symtab;
11626 restart_symtab (tu_group->compunit_symtab, "", 0);
11628 for (i = 0; i < cu->line_header->file_names.size (); ++i)
11630 file_entry &fe = cu->line_header->file_names[i];
11632 fe.symtab = tu_group->symtabs[i];
11636 /* The main symtab is allocated last. Type units don't have DW_AT_name
11637 so they don't have a "real" (so to speak) symtab anyway.
11638 There is later code that will assign the main symtab to all symbols
11639 that don't have one. We need to handle the case of a symbol with a
11640 missing symtab (DW_AT_decl_file) anyway. */
11643 /* Process DW_TAG_type_unit.
11644 For TUs we want to skip the first top level sibling if it's not the
11645 actual type being defined by this TU. In this case the first top
11646 level sibling is there to provide context only. */
11649 read_type_unit_scope (struct die_info *die, struct dwarf2_cu *cu)
11651 struct die_info *child_die;
11653 prepare_one_comp_unit (cu, die, language_minimal);
11655 /* Initialize (or reinitialize) the machinery for building symtabs.
11656 We do this before processing child DIEs, so that the line header table
11657 is available for DW_AT_decl_file. */
11658 setup_type_unit_groups (die, cu);
11660 if (die->child != NULL)
11662 child_die = die->child;
11663 while (child_die && child_die->tag)
11665 process_die (child_die, cu);
11666 child_die = sibling_die (child_die);
11673 http://gcc.gnu.org/wiki/DebugFission
11674 http://gcc.gnu.org/wiki/DebugFissionDWP
11676 To simplify handling of both DWO files ("object" files with the DWARF info)
11677 and DWP files (a file with the DWOs packaged up into one file), we treat
11678 DWP files as having a collection of virtual DWO files. */
11681 hash_dwo_file (const void *item)
11683 const struct dwo_file *dwo_file = (const struct dwo_file *) item;
11686 hash = htab_hash_string (dwo_file->dwo_name);
11687 if (dwo_file->comp_dir != NULL)
11688 hash += htab_hash_string (dwo_file->comp_dir);
11693 eq_dwo_file (const void *item_lhs, const void *item_rhs)
11695 const struct dwo_file *lhs = (const struct dwo_file *) item_lhs;
11696 const struct dwo_file *rhs = (const struct dwo_file *) item_rhs;
11698 if (strcmp (lhs->dwo_name, rhs->dwo_name) != 0)
11700 if (lhs->comp_dir == NULL || rhs->comp_dir == NULL)
11701 return lhs->comp_dir == rhs->comp_dir;
11702 return strcmp (lhs->comp_dir, rhs->comp_dir) == 0;
11705 /* Allocate a hash table for DWO files. */
11708 allocate_dwo_file_hash_table (struct objfile *objfile)
11710 return htab_create_alloc_ex (41,
11714 &objfile->objfile_obstack,
11715 hashtab_obstack_allocate,
11716 dummy_obstack_deallocate);
11719 /* Lookup DWO file DWO_NAME. */
11722 lookup_dwo_file_slot (struct dwarf2_per_objfile *dwarf2_per_objfile,
11723 const char *dwo_name,
11724 const char *comp_dir)
11726 struct dwo_file find_entry;
11729 if (dwarf2_per_objfile->dwo_files == NULL)
11730 dwarf2_per_objfile->dwo_files
11731 = allocate_dwo_file_hash_table (dwarf2_per_objfile->objfile);
11733 memset (&find_entry, 0, sizeof (find_entry));
11734 find_entry.dwo_name = dwo_name;
11735 find_entry.comp_dir = comp_dir;
11736 slot = htab_find_slot (dwarf2_per_objfile->dwo_files, &find_entry, INSERT);
11742 hash_dwo_unit (const void *item)
11744 const struct dwo_unit *dwo_unit = (const struct dwo_unit *) item;
11746 /* This drops the top 32 bits of the id, but is ok for a hash. */
11747 return dwo_unit->signature;
11751 eq_dwo_unit (const void *item_lhs, const void *item_rhs)
11753 const struct dwo_unit *lhs = (const struct dwo_unit *) item_lhs;
11754 const struct dwo_unit *rhs = (const struct dwo_unit *) item_rhs;
11756 /* The signature is assumed to be unique within the DWO file.
11757 So while object file CU dwo_id's always have the value zero,
11758 that's OK, assuming each object file DWO file has only one CU,
11759 and that's the rule for now. */
11760 return lhs->signature == rhs->signature;
11763 /* Allocate a hash table for DWO CUs,TUs.
11764 There is one of these tables for each of CUs,TUs for each DWO file. */
11767 allocate_dwo_unit_table (struct objfile *objfile)
11769 /* Start out with a pretty small number.
11770 Generally DWO files contain only one CU and maybe some TUs. */
11771 return htab_create_alloc_ex (3,
11775 &objfile->objfile_obstack,
11776 hashtab_obstack_allocate,
11777 dummy_obstack_deallocate);
11780 /* Structure used to pass data to create_dwo_debug_info_hash_table_reader. */
11782 struct create_dwo_cu_data
11784 struct dwo_file *dwo_file;
11785 struct dwo_unit dwo_unit;
11788 /* die_reader_func for create_dwo_cu. */
11791 create_dwo_cu_reader (const struct die_reader_specs *reader,
11792 const gdb_byte *info_ptr,
11793 struct die_info *comp_unit_die,
11797 struct dwarf2_cu *cu = reader->cu;
11798 sect_offset sect_off = cu->per_cu->sect_off;
11799 struct dwarf2_section_info *section = cu->per_cu->section;
11800 struct create_dwo_cu_data *data = (struct create_dwo_cu_data *) datap;
11801 struct dwo_file *dwo_file = data->dwo_file;
11802 struct dwo_unit *dwo_unit = &data->dwo_unit;
11803 struct attribute *attr;
11805 attr = dwarf2_attr (comp_unit_die, DW_AT_GNU_dwo_id, cu);
11808 complaint (&symfile_complaints,
11809 _("Dwarf Error: debug entry at offset %s is missing"
11810 " its dwo_id [in module %s]"),
11811 sect_offset_str (sect_off), dwo_file->dwo_name);
11815 dwo_unit->dwo_file = dwo_file;
11816 dwo_unit->signature = DW_UNSND (attr);
11817 dwo_unit->section = section;
11818 dwo_unit->sect_off = sect_off;
11819 dwo_unit->length = cu->per_cu->length;
11821 if (dwarf_read_debug)
11822 fprintf_unfiltered (gdb_stdlog, " offset %s, dwo_id %s\n",
11823 sect_offset_str (sect_off),
11824 hex_string (dwo_unit->signature));
11827 /* Create the dwo_units for the CUs in a DWO_FILE.
11828 Note: This function processes DWO files only, not DWP files. */
11831 create_cus_hash_table (struct dwarf2_per_objfile *dwarf2_per_objfile,
11832 struct dwo_file &dwo_file, dwarf2_section_info §ion,
11835 struct objfile *objfile = dwarf2_per_objfile->objfile;
11836 const gdb_byte *info_ptr, *end_ptr;
11838 dwarf2_read_section (objfile, §ion);
11839 info_ptr = section.buffer;
11841 if (info_ptr == NULL)
11844 if (dwarf_read_debug)
11846 fprintf_unfiltered (gdb_stdlog, "Reading %s for %s:\n",
11847 get_section_name (§ion),
11848 get_section_file_name (§ion));
11851 end_ptr = info_ptr + section.size;
11852 while (info_ptr < end_ptr)
11854 struct dwarf2_per_cu_data per_cu;
11855 struct create_dwo_cu_data create_dwo_cu_data;
11856 struct dwo_unit *dwo_unit;
11858 sect_offset sect_off = (sect_offset) (info_ptr - section.buffer);
11860 memset (&create_dwo_cu_data.dwo_unit, 0,
11861 sizeof (create_dwo_cu_data.dwo_unit));
11862 memset (&per_cu, 0, sizeof (per_cu));
11863 per_cu.dwarf2_per_objfile = dwarf2_per_objfile;
11864 per_cu.is_debug_types = 0;
11865 per_cu.sect_off = sect_offset (info_ptr - section.buffer);
11866 per_cu.section = §ion;
11867 create_dwo_cu_data.dwo_file = &dwo_file;
11869 init_cutu_and_read_dies_no_follow (
11870 &per_cu, &dwo_file, create_dwo_cu_reader, &create_dwo_cu_data);
11871 info_ptr += per_cu.length;
11873 // If the unit could not be parsed, skip it.
11874 if (create_dwo_cu_data.dwo_unit.dwo_file == NULL)
11877 if (cus_htab == NULL)
11878 cus_htab = allocate_dwo_unit_table (objfile);
11880 dwo_unit = OBSTACK_ZALLOC (&objfile->objfile_obstack, struct dwo_unit);
11881 *dwo_unit = create_dwo_cu_data.dwo_unit;
11882 slot = htab_find_slot (cus_htab, dwo_unit, INSERT);
11883 gdb_assert (slot != NULL);
11886 const struct dwo_unit *dup_cu = (const struct dwo_unit *)*slot;
11887 sect_offset dup_sect_off = dup_cu->sect_off;
11889 complaint (&symfile_complaints,
11890 _("debug cu entry at offset %s is duplicate to"
11891 " the entry at offset %s, signature %s"),
11892 sect_offset_str (sect_off), sect_offset_str (dup_sect_off),
11893 hex_string (dwo_unit->signature));
11895 *slot = (void *)dwo_unit;
11899 /* DWP file .debug_{cu,tu}_index section format:
11900 [ref: http://gcc.gnu.org/wiki/DebugFissionDWP]
11904 Both index sections have the same format, and serve to map a 64-bit
11905 signature to a set of section numbers. Each section begins with a header,
11906 followed by a hash table of 64-bit signatures, a parallel table of 32-bit
11907 indexes, and a pool of 32-bit section numbers. The index sections will be
11908 aligned at 8-byte boundaries in the file.
11910 The index section header consists of:
11912 V, 32 bit version number
11914 N, 32 bit number of compilation units or type units in the index
11915 M, 32 bit number of slots in the hash table
11917 Numbers are recorded using the byte order of the application binary.
11919 The hash table begins at offset 16 in the section, and consists of an array
11920 of M 64-bit slots. Each slot contains a 64-bit signature (using the byte
11921 order of the application binary). Unused slots in the hash table are 0.
11922 (We rely on the extreme unlikeliness of a signature being exactly 0.)
11924 The parallel table begins immediately after the hash table
11925 (at offset 16 + 8 * M from the beginning of the section), and consists of an
11926 array of 32-bit indexes (using the byte order of the application binary),
11927 corresponding 1-1 with slots in the hash table. Each entry in the parallel
11928 table contains a 32-bit index into the pool of section numbers. For unused
11929 hash table slots, the corresponding entry in the parallel table will be 0.
11931 The pool of section numbers begins immediately following the hash table
11932 (at offset 16 + 12 * M from the beginning of the section). The pool of
11933 section numbers consists of an array of 32-bit words (using the byte order
11934 of the application binary). Each item in the array is indexed starting
11935 from 0. The hash table entry provides the index of the first section
11936 number in the set. Additional section numbers in the set follow, and the
11937 set is terminated by a 0 entry (section number 0 is not used in ELF).
11939 In each set of section numbers, the .debug_info.dwo or .debug_types.dwo
11940 section must be the first entry in the set, and the .debug_abbrev.dwo must
11941 be the second entry. Other members of the set may follow in any order.
11947 DWP Version 2 combines all the .debug_info, etc. sections into one,
11948 and the entries in the index tables are now offsets into these sections.
11949 CU offsets begin at 0. TU offsets begin at the size of the .debug_info
11952 Index Section Contents:
11954 Hash Table of Signatures dwp_hash_table.hash_table
11955 Parallel Table of Indices dwp_hash_table.unit_table
11956 Table of Section Offsets dwp_hash_table.v2.{section_ids,offsets}
11957 Table of Section Sizes dwp_hash_table.v2.sizes
11959 The index section header consists of:
11961 V, 32 bit version number
11962 L, 32 bit number of columns in the table of section offsets
11963 N, 32 bit number of compilation units or type units in the index
11964 M, 32 bit number of slots in the hash table
11966 Numbers are recorded using the byte order of the application binary.
11968 The hash table has the same format as version 1.
11969 The parallel table of indices has the same format as version 1,
11970 except that the entries are origin-1 indices into the table of sections
11971 offsets and the table of section sizes.
11973 The table of offsets begins immediately following the parallel table
11974 (at offset 16 + 12 * M from the beginning of the section). The table is
11975 a two-dimensional array of 32-bit words (using the byte order of the
11976 application binary), with L columns and N+1 rows, in row-major order.
11977 Each row in the array is indexed starting from 0. The first row provides
11978 a key to the remaining rows: each column in this row provides an identifier
11979 for a debug section, and the offsets in the same column of subsequent rows
11980 refer to that section. The section identifiers are:
11982 DW_SECT_INFO 1 .debug_info.dwo
11983 DW_SECT_TYPES 2 .debug_types.dwo
11984 DW_SECT_ABBREV 3 .debug_abbrev.dwo
11985 DW_SECT_LINE 4 .debug_line.dwo
11986 DW_SECT_LOC 5 .debug_loc.dwo
11987 DW_SECT_STR_OFFSETS 6 .debug_str_offsets.dwo
11988 DW_SECT_MACINFO 7 .debug_macinfo.dwo
11989 DW_SECT_MACRO 8 .debug_macro.dwo
11991 The offsets provided by the CU and TU index sections are the base offsets
11992 for the contributions made by each CU or TU to the corresponding section
11993 in the package file. Each CU and TU header contains an abbrev_offset
11994 field, used to find the abbreviations table for that CU or TU within the
11995 contribution to the .debug_abbrev.dwo section for that CU or TU, and should
11996 be interpreted as relative to the base offset given in the index section.
11997 Likewise, offsets into .debug_line.dwo from DW_AT_stmt_list attributes
11998 should be interpreted as relative to the base offset for .debug_line.dwo,
11999 and offsets into other debug sections obtained from DWARF attributes should
12000 also be interpreted as relative to the corresponding base offset.
12002 The table of sizes begins immediately following the table of offsets.
12003 Like the table of offsets, it is a two-dimensional array of 32-bit words,
12004 with L columns and N rows, in row-major order. Each row in the array is
12005 indexed starting from 1 (row 0 is shared by the two tables).
12009 Hash table lookup is handled the same in version 1 and 2:
12011 We assume that N and M will not exceed 2^32 - 1.
12012 The size of the hash table, M, must be 2^k such that 2^k > 3*N/2.
12014 Given a 64-bit compilation unit signature or a type signature S, an entry
12015 in the hash table is located as follows:
12017 1) Calculate a primary hash H = S & MASK(k), where MASK(k) is a mask with
12018 the low-order k bits all set to 1.
12020 2) Calculate a secondary hash H' = (((S >> 32) & MASK(k)) | 1).
12022 3) If the hash table entry at index H matches the signature, use that
12023 entry. If the hash table entry at index H is unused (all zeroes),
12024 terminate the search: the signature is not present in the table.
12026 4) Let H = (H + H') modulo M. Repeat at Step 3.
12028 Because M > N and H' and M are relatively prime, the search is guaranteed
12029 to stop at an unused slot or find the match. */
12031 /* Create a hash table to map DWO IDs to their CU/TU entry in
12032 .debug_{info,types}.dwo in DWP_FILE.
12033 Returns NULL if there isn't one.
12034 Note: This function processes DWP files only, not DWO files. */
12036 static struct dwp_hash_table *
12037 create_dwp_hash_table (struct dwarf2_per_objfile *dwarf2_per_objfile,
12038 struct dwp_file *dwp_file, int is_debug_types)
12040 struct objfile *objfile = dwarf2_per_objfile->objfile;
12041 bfd *dbfd = dwp_file->dbfd;
12042 const gdb_byte *index_ptr, *index_end;
12043 struct dwarf2_section_info *index;
12044 uint32_t version, nr_columns, nr_units, nr_slots;
12045 struct dwp_hash_table *htab;
12047 if (is_debug_types)
12048 index = &dwp_file->sections.tu_index;
12050 index = &dwp_file->sections.cu_index;
12052 if (dwarf2_section_empty_p (index))
12054 dwarf2_read_section (objfile, index);
12056 index_ptr = index->buffer;
12057 index_end = index_ptr + index->size;
12059 version = read_4_bytes (dbfd, index_ptr);
12062 nr_columns = read_4_bytes (dbfd, index_ptr);
12066 nr_units = read_4_bytes (dbfd, index_ptr);
12068 nr_slots = read_4_bytes (dbfd, index_ptr);
12071 if (version != 1 && version != 2)
12073 error (_("Dwarf Error: unsupported DWP file version (%s)"
12074 " [in module %s]"),
12075 pulongest (version), dwp_file->name);
12077 if (nr_slots != (nr_slots & -nr_slots))
12079 error (_("Dwarf Error: number of slots in DWP hash table (%s)"
12080 " is not power of 2 [in module %s]"),
12081 pulongest (nr_slots), dwp_file->name);
12084 htab = OBSTACK_ZALLOC (&objfile->objfile_obstack, struct dwp_hash_table);
12085 htab->version = version;
12086 htab->nr_columns = nr_columns;
12087 htab->nr_units = nr_units;
12088 htab->nr_slots = nr_slots;
12089 htab->hash_table = index_ptr;
12090 htab->unit_table = htab->hash_table + sizeof (uint64_t) * nr_slots;
12092 /* Exit early if the table is empty. */
12093 if (nr_slots == 0 || nr_units == 0
12094 || (version == 2 && nr_columns == 0))
12096 /* All must be zero. */
12097 if (nr_slots != 0 || nr_units != 0
12098 || (version == 2 && nr_columns != 0))
12100 complaint (&symfile_complaints,
12101 _("Empty DWP but nr_slots,nr_units,nr_columns not"
12102 " all zero [in modules %s]"),
12110 htab->section_pool.v1.indices =
12111 htab->unit_table + sizeof (uint32_t) * nr_slots;
12112 /* It's harder to decide whether the section is too small in v1.
12113 V1 is deprecated anyway so we punt. */
12117 const gdb_byte *ids_ptr = htab->unit_table + sizeof (uint32_t) * nr_slots;
12118 int *ids = htab->section_pool.v2.section_ids;
12119 /* Reverse map for error checking. */
12120 int ids_seen[DW_SECT_MAX + 1];
12123 if (nr_columns < 2)
12125 error (_("Dwarf Error: bad DWP hash table, too few columns"
12126 " in section table [in module %s]"),
12129 if (nr_columns > MAX_NR_V2_DWO_SECTIONS)
12131 error (_("Dwarf Error: bad DWP hash table, too many columns"
12132 " in section table [in module %s]"),
12135 memset (ids, 255, (DW_SECT_MAX + 1) * sizeof (int32_t));
12136 memset (ids_seen, 255, (DW_SECT_MAX + 1) * sizeof (int32_t));
12137 for (i = 0; i < nr_columns; ++i)
12139 int id = read_4_bytes (dbfd, ids_ptr + i * sizeof (uint32_t));
12141 if (id < DW_SECT_MIN || id > DW_SECT_MAX)
12143 error (_("Dwarf Error: bad DWP hash table, bad section id %d"
12144 " in section table [in module %s]"),
12145 id, dwp_file->name);
12147 if (ids_seen[id] != -1)
12149 error (_("Dwarf Error: bad DWP hash table, duplicate section"
12150 " id %d in section table [in module %s]"),
12151 id, dwp_file->name);
12156 /* Must have exactly one info or types section. */
12157 if (((ids_seen[DW_SECT_INFO] != -1)
12158 + (ids_seen[DW_SECT_TYPES] != -1))
12161 error (_("Dwarf Error: bad DWP hash table, missing/duplicate"
12162 " DWO info/types section [in module %s]"),
12165 /* Must have an abbrev section. */
12166 if (ids_seen[DW_SECT_ABBREV] == -1)
12168 error (_("Dwarf Error: bad DWP hash table, missing DWO abbrev"
12169 " section [in module %s]"),
12172 htab->section_pool.v2.offsets = ids_ptr + sizeof (uint32_t) * nr_columns;
12173 htab->section_pool.v2.sizes =
12174 htab->section_pool.v2.offsets + (sizeof (uint32_t)
12175 * nr_units * nr_columns);
12176 if ((htab->section_pool.v2.sizes + (sizeof (uint32_t)
12177 * nr_units * nr_columns))
12180 error (_("Dwarf Error: DWP index section is corrupt (too small)"
12181 " [in module %s]"),
12189 /* Update SECTIONS with the data from SECTP.
12191 This function is like the other "locate" section routines that are
12192 passed to bfd_map_over_sections, but in this context the sections to
12193 read comes from the DWP V1 hash table, not the full ELF section table.
12195 The result is non-zero for success, or zero if an error was found. */
12198 locate_v1_virtual_dwo_sections (asection *sectp,
12199 struct virtual_v1_dwo_sections *sections)
12201 const struct dwop_section_names *names = &dwop_section_names;
12203 if (section_is_p (sectp->name, &names->abbrev_dwo))
12205 /* There can be only one. */
12206 if (sections->abbrev.s.section != NULL)
12208 sections->abbrev.s.section = sectp;
12209 sections->abbrev.size = bfd_get_section_size (sectp);
12211 else if (section_is_p (sectp->name, &names->info_dwo)
12212 || section_is_p (sectp->name, &names->types_dwo))
12214 /* There can be only one. */
12215 if (sections->info_or_types.s.section != NULL)
12217 sections->info_or_types.s.section = sectp;
12218 sections->info_or_types.size = bfd_get_section_size (sectp);
12220 else if (section_is_p (sectp->name, &names->line_dwo))
12222 /* There can be only one. */
12223 if (sections->line.s.section != NULL)
12225 sections->line.s.section = sectp;
12226 sections->line.size = bfd_get_section_size (sectp);
12228 else if (section_is_p (sectp->name, &names->loc_dwo))
12230 /* There can be only one. */
12231 if (sections->loc.s.section != NULL)
12233 sections->loc.s.section = sectp;
12234 sections->loc.size = bfd_get_section_size (sectp);
12236 else if (section_is_p (sectp->name, &names->macinfo_dwo))
12238 /* There can be only one. */
12239 if (sections->macinfo.s.section != NULL)
12241 sections->macinfo.s.section = sectp;
12242 sections->macinfo.size = bfd_get_section_size (sectp);
12244 else if (section_is_p (sectp->name, &names->macro_dwo))
12246 /* There can be only one. */
12247 if (sections->macro.s.section != NULL)
12249 sections->macro.s.section = sectp;
12250 sections->macro.size = bfd_get_section_size (sectp);
12252 else if (section_is_p (sectp->name, &names->str_offsets_dwo))
12254 /* There can be only one. */
12255 if (sections->str_offsets.s.section != NULL)
12257 sections->str_offsets.s.section = sectp;
12258 sections->str_offsets.size = bfd_get_section_size (sectp);
12262 /* No other kind of section is valid. */
12269 /* Create a dwo_unit object for the DWO unit with signature SIGNATURE.
12270 UNIT_INDEX is the index of the DWO unit in the DWP hash table.
12271 COMP_DIR is the DW_AT_comp_dir attribute of the referencing CU.
12272 This is for DWP version 1 files. */
12274 static struct dwo_unit *
12275 create_dwo_unit_in_dwp_v1 (struct dwarf2_per_objfile *dwarf2_per_objfile,
12276 struct dwp_file *dwp_file,
12277 uint32_t unit_index,
12278 const char *comp_dir,
12279 ULONGEST signature, int is_debug_types)
12281 struct objfile *objfile = dwarf2_per_objfile->objfile;
12282 const struct dwp_hash_table *dwp_htab =
12283 is_debug_types ? dwp_file->tus : dwp_file->cus;
12284 bfd *dbfd = dwp_file->dbfd;
12285 const char *kind = is_debug_types ? "TU" : "CU";
12286 struct dwo_file *dwo_file;
12287 struct dwo_unit *dwo_unit;
12288 struct virtual_v1_dwo_sections sections;
12289 void **dwo_file_slot;
12292 gdb_assert (dwp_file->version == 1);
12294 if (dwarf_read_debug)
12296 fprintf_unfiltered (gdb_stdlog, "Reading %s %s/%s in DWP V1 file: %s\n",
12298 pulongest (unit_index), hex_string (signature),
12302 /* Fetch the sections of this DWO unit.
12303 Put a limit on the number of sections we look for so that bad data
12304 doesn't cause us to loop forever. */
12306 #define MAX_NR_V1_DWO_SECTIONS \
12307 (1 /* .debug_info or .debug_types */ \
12308 + 1 /* .debug_abbrev */ \
12309 + 1 /* .debug_line */ \
12310 + 1 /* .debug_loc */ \
12311 + 1 /* .debug_str_offsets */ \
12312 + 1 /* .debug_macro or .debug_macinfo */ \
12313 + 1 /* trailing zero */)
12315 memset (§ions, 0, sizeof (sections));
12317 for (i = 0; i < MAX_NR_V1_DWO_SECTIONS; ++i)
12320 uint32_t section_nr =
12321 read_4_bytes (dbfd,
12322 dwp_htab->section_pool.v1.indices
12323 + (unit_index + i) * sizeof (uint32_t));
12325 if (section_nr == 0)
12327 if (section_nr >= dwp_file->num_sections)
12329 error (_("Dwarf Error: bad DWP hash table, section number too large"
12330 " [in module %s]"),
12334 sectp = dwp_file->elf_sections[section_nr];
12335 if (! locate_v1_virtual_dwo_sections (sectp, §ions))
12337 error (_("Dwarf Error: bad DWP hash table, invalid section found"
12338 " [in module %s]"),
12344 || dwarf2_section_empty_p (§ions.info_or_types)
12345 || dwarf2_section_empty_p (§ions.abbrev))
12347 error (_("Dwarf Error: bad DWP hash table, missing DWO sections"
12348 " [in module %s]"),
12351 if (i == MAX_NR_V1_DWO_SECTIONS)
12353 error (_("Dwarf Error: bad DWP hash table, too many DWO sections"
12354 " [in module %s]"),
12358 /* It's easier for the rest of the code if we fake a struct dwo_file and
12359 have dwo_unit "live" in that. At least for now.
12361 The DWP file can be made up of a random collection of CUs and TUs.
12362 However, for each CU + set of TUs that came from the same original DWO
12363 file, we can combine them back into a virtual DWO file to save space
12364 (fewer struct dwo_file objects to allocate). Remember that for really
12365 large apps there can be on the order of 8K CUs and 200K TUs, or more. */
12367 std::string virtual_dwo_name =
12368 string_printf ("virtual-dwo/%d-%d-%d-%d",
12369 get_section_id (§ions.abbrev),
12370 get_section_id (§ions.line),
12371 get_section_id (§ions.loc),
12372 get_section_id (§ions.str_offsets));
12373 /* Can we use an existing virtual DWO file? */
12374 dwo_file_slot = lookup_dwo_file_slot (dwarf2_per_objfile,
12375 virtual_dwo_name.c_str (),
12377 /* Create one if necessary. */
12378 if (*dwo_file_slot == NULL)
12380 if (dwarf_read_debug)
12382 fprintf_unfiltered (gdb_stdlog, "Creating virtual DWO: %s\n",
12383 virtual_dwo_name.c_str ());
12385 dwo_file = OBSTACK_ZALLOC (&objfile->objfile_obstack, struct dwo_file);
12387 = (const char *) obstack_copy0 (&objfile->objfile_obstack,
12388 virtual_dwo_name.c_str (),
12389 virtual_dwo_name.size ());
12390 dwo_file->comp_dir = comp_dir;
12391 dwo_file->sections.abbrev = sections.abbrev;
12392 dwo_file->sections.line = sections.line;
12393 dwo_file->sections.loc = sections.loc;
12394 dwo_file->sections.macinfo = sections.macinfo;
12395 dwo_file->sections.macro = sections.macro;
12396 dwo_file->sections.str_offsets = sections.str_offsets;
12397 /* The "str" section is global to the entire DWP file. */
12398 dwo_file->sections.str = dwp_file->sections.str;
12399 /* The info or types section is assigned below to dwo_unit,
12400 there's no need to record it in dwo_file.
12401 Also, we can't simply record type sections in dwo_file because
12402 we record a pointer into the vector in dwo_unit. As we collect more
12403 types we'll grow the vector and eventually have to reallocate space
12404 for it, invalidating all copies of pointers into the previous
12406 *dwo_file_slot = dwo_file;
12410 if (dwarf_read_debug)
12412 fprintf_unfiltered (gdb_stdlog, "Using existing virtual DWO: %s\n",
12413 virtual_dwo_name.c_str ());
12415 dwo_file = (struct dwo_file *) *dwo_file_slot;
12418 dwo_unit = OBSTACK_ZALLOC (&objfile->objfile_obstack, struct dwo_unit);
12419 dwo_unit->dwo_file = dwo_file;
12420 dwo_unit->signature = signature;
12421 dwo_unit->section =
12422 XOBNEW (&objfile->objfile_obstack, struct dwarf2_section_info);
12423 *dwo_unit->section = sections.info_or_types;
12424 /* dwo_unit->{offset,length,type_offset_in_tu} are set later. */
12429 /* Subroutine of create_dwo_unit_in_dwp_v2 to simplify it.
12430 Given a pointer to the containing section SECTION, and OFFSET,SIZE of the
12431 piece within that section used by a TU/CU, return a virtual section
12432 of just that piece. */
12434 static struct dwarf2_section_info
12435 create_dwp_v2_section (struct dwarf2_per_objfile *dwarf2_per_objfile,
12436 struct dwarf2_section_info *section,
12437 bfd_size_type offset, bfd_size_type size)
12439 struct dwarf2_section_info result;
12442 gdb_assert (section != NULL);
12443 gdb_assert (!section->is_virtual);
12445 memset (&result, 0, sizeof (result));
12446 result.s.containing_section = section;
12447 result.is_virtual = 1;
12452 sectp = get_section_bfd_section (section);
12454 /* Flag an error if the piece denoted by OFFSET,SIZE is outside the
12455 bounds of the real section. This is a pretty-rare event, so just
12456 flag an error (easier) instead of a warning and trying to cope. */
12458 || offset + size > bfd_get_section_size (sectp))
12460 error (_("Dwarf Error: Bad DWP V2 section info, doesn't fit"
12461 " in section %s [in module %s]"),
12462 sectp ? bfd_section_name (abfd, sectp) : "<unknown>",
12463 objfile_name (dwarf2_per_objfile->objfile));
12466 result.virtual_offset = offset;
12467 result.size = size;
12471 /* Create a dwo_unit object for the DWO unit with signature SIGNATURE.
12472 UNIT_INDEX is the index of the DWO unit in the DWP hash table.
12473 COMP_DIR is the DW_AT_comp_dir attribute of the referencing CU.
12474 This is for DWP version 2 files. */
12476 static struct dwo_unit *
12477 create_dwo_unit_in_dwp_v2 (struct dwarf2_per_objfile *dwarf2_per_objfile,
12478 struct dwp_file *dwp_file,
12479 uint32_t unit_index,
12480 const char *comp_dir,
12481 ULONGEST signature, int is_debug_types)
12483 struct objfile *objfile = dwarf2_per_objfile->objfile;
12484 const struct dwp_hash_table *dwp_htab =
12485 is_debug_types ? dwp_file->tus : dwp_file->cus;
12486 bfd *dbfd = dwp_file->dbfd;
12487 const char *kind = is_debug_types ? "TU" : "CU";
12488 struct dwo_file *dwo_file;
12489 struct dwo_unit *dwo_unit;
12490 struct virtual_v2_dwo_sections sections;
12491 void **dwo_file_slot;
12494 gdb_assert (dwp_file->version == 2);
12496 if (dwarf_read_debug)
12498 fprintf_unfiltered (gdb_stdlog, "Reading %s %s/%s in DWP V2 file: %s\n",
12500 pulongest (unit_index), hex_string (signature),
12504 /* Fetch the section offsets of this DWO unit. */
12506 memset (§ions, 0, sizeof (sections));
12508 for (i = 0; i < dwp_htab->nr_columns; ++i)
12510 uint32_t offset = read_4_bytes (dbfd,
12511 dwp_htab->section_pool.v2.offsets
12512 + (((unit_index - 1) * dwp_htab->nr_columns
12514 * sizeof (uint32_t)));
12515 uint32_t size = read_4_bytes (dbfd,
12516 dwp_htab->section_pool.v2.sizes
12517 + (((unit_index - 1) * dwp_htab->nr_columns
12519 * sizeof (uint32_t)));
12521 switch (dwp_htab->section_pool.v2.section_ids[i])
12524 case DW_SECT_TYPES:
12525 sections.info_or_types_offset = offset;
12526 sections.info_or_types_size = size;
12528 case DW_SECT_ABBREV:
12529 sections.abbrev_offset = offset;
12530 sections.abbrev_size = size;
12533 sections.line_offset = offset;
12534 sections.line_size = size;
12537 sections.loc_offset = offset;
12538 sections.loc_size = size;
12540 case DW_SECT_STR_OFFSETS:
12541 sections.str_offsets_offset = offset;
12542 sections.str_offsets_size = size;
12544 case DW_SECT_MACINFO:
12545 sections.macinfo_offset = offset;
12546 sections.macinfo_size = size;
12548 case DW_SECT_MACRO:
12549 sections.macro_offset = offset;
12550 sections.macro_size = size;
12555 /* It's easier for the rest of the code if we fake a struct dwo_file and
12556 have dwo_unit "live" in that. At least for now.
12558 The DWP file can be made up of a random collection of CUs and TUs.
12559 However, for each CU + set of TUs that came from the same original DWO
12560 file, we can combine them back into a virtual DWO file to save space
12561 (fewer struct dwo_file objects to allocate). Remember that for really
12562 large apps there can be on the order of 8K CUs and 200K TUs, or more. */
12564 std::string virtual_dwo_name =
12565 string_printf ("virtual-dwo/%ld-%ld-%ld-%ld",
12566 (long) (sections.abbrev_size ? sections.abbrev_offset : 0),
12567 (long) (sections.line_size ? sections.line_offset : 0),
12568 (long) (sections.loc_size ? sections.loc_offset : 0),
12569 (long) (sections.str_offsets_size
12570 ? sections.str_offsets_offset : 0));
12571 /* Can we use an existing virtual DWO file? */
12572 dwo_file_slot = lookup_dwo_file_slot (dwarf2_per_objfile,
12573 virtual_dwo_name.c_str (),
12575 /* Create one if necessary. */
12576 if (*dwo_file_slot == NULL)
12578 if (dwarf_read_debug)
12580 fprintf_unfiltered (gdb_stdlog, "Creating virtual DWO: %s\n",
12581 virtual_dwo_name.c_str ());
12583 dwo_file = OBSTACK_ZALLOC (&objfile->objfile_obstack, struct dwo_file);
12585 = (const char *) obstack_copy0 (&objfile->objfile_obstack,
12586 virtual_dwo_name.c_str (),
12587 virtual_dwo_name.size ());
12588 dwo_file->comp_dir = comp_dir;
12589 dwo_file->sections.abbrev =
12590 create_dwp_v2_section (dwarf2_per_objfile, &dwp_file->sections.abbrev,
12591 sections.abbrev_offset, sections.abbrev_size);
12592 dwo_file->sections.line =
12593 create_dwp_v2_section (dwarf2_per_objfile, &dwp_file->sections.line,
12594 sections.line_offset, sections.line_size);
12595 dwo_file->sections.loc =
12596 create_dwp_v2_section (dwarf2_per_objfile, &dwp_file->sections.loc,
12597 sections.loc_offset, sections.loc_size);
12598 dwo_file->sections.macinfo =
12599 create_dwp_v2_section (dwarf2_per_objfile, &dwp_file->sections.macinfo,
12600 sections.macinfo_offset, sections.macinfo_size);
12601 dwo_file->sections.macro =
12602 create_dwp_v2_section (dwarf2_per_objfile, &dwp_file->sections.macro,
12603 sections.macro_offset, sections.macro_size);
12604 dwo_file->sections.str_offsets =
12605 create_dwp_v2_section (dwarf2_per_objfile,
12606 &dwp_file->sections.str_offsets,
12607 sections.str_offsets_offset,
12608 sections.str_offsets_size);
12609 /* The "str" section is global to the entire DWP file. */
12610 dwo_file->sections.str = dwp_file->sections.str;
12611 /* The info or types section is assigned below to dwo_unit,
12612 there's no need to record it in dwo_file.
12613 Also, we can't simply record type sections in dwo_file because
12614 we record a pointer into the vector in dwo_unit. As we collect more
12615 types we'll grow the vector and eventually have to reallocate space
12616 for it, invalidating all copies of pointers into the previous
12618 *dwo_file_slot = dwo_file;
12622 if (dwarf_read_debug)
12624 fprintf_unfiltered (gdb_stdlog, "Using existing virtual DWO: %s\n",
12625 virtual_dwo_name.c_str ());
12627 dwo_file = (struct dwo_file *) *dwo_file_slot;
12630 dwo_unit = OBSTACK_ZALLOC (&objfile->objfile_obstack, struct dwo_unit);
12631 dwo_unit->dwo_file = dwo_file;
12632 dwo_unit->signature = signature;
12633 dwo_unit->section =
12634 XOBNEW (&objfile->objfile_obstack, struct dwarf2_section_info);
12635 *dwo_unit->section = create_dwp_v2_section (dwarf2_per_objfile,
12637 ? &dwp_file->sections.types
12638 : &dwp_file->sections.info,
12639 sections.info_or_types_offset,
12640 sections.info_or_types_size);
12641 /* dwo_unit->{offset,length,type_offset_in_tu} are set later. */
12646 /* Lookup the DWO unit with SIGNATURE in DWP_FILE.
12647 Returns NULL if the signature isn't found. */
12649 static struct dwo_unit *
12650 lookup_dwo_unit_in_dwp (struct dwarf2_per_objfile *dwarf2_per_objfile,
12651 struct dwp_file *dwp_file, const char *comp_dir,
12652 ULONGEST signature, int is_debug_types)
12654 const struct dwp_hash_table *dwp_htab =
12655 is_debug_types ? dwp_file->tus : dwp_file->cus;
12656 bfd *dbfd = dwp_file->dbfd;
12657 uint32_t mask = dwp_htab->nr_slots - 1;
12658 uint32_t hash = signature & mask;
12659 uint32_t hash2 = ((signature >> 32) & mask) | 1;
12662 struct dwo_unit find_dwo_cu;
12664 memset (&find_dwo_cu, 0, sizeof (find_dwo_cu));
12665 find_dwo_cu.signature = signature;
12666 slot = htab_find_slot (is_debug_types
12667 ? dwp_file->loaded_tus
12668 : dwp_file->loaded_cus,
12669 &find_dwo_cu, INSERT);
12672 return (struct dwo_unit *) *slot;
12674 /* Use a for loop so that we don't loop forever on bad debug info. */
12675 for (i = 0; i < dwp_htab->nr_slots; ++i)
12677 ULONGEST signature_in_table;
12679 signature_in_table =
12680 read_8_bytes (dbfd, dwp_htab->hash_table + hash * sizeof (uint64_t));
12681 if (signature_in_table == signature)
12683 uint32_t unit_index =
12684 read_4_bytes (dbfd,
12685 dwp_htab->unit_table + hash * sizeof (uint32_t));
12687 if (dwp_file->version == 1)
12689 *slot = create_dwo_unit_in_dwp_v1 (dwarf2_per_objfile,
12690 dwp_file, unit_index,
12691 comp_dir, signature,
12696 *slot = create_dwo_unit_in_dwp_v2 (dwarf2_per_objfile,
12697 dwp_file, unit_index,
12698 comp_dir, signature,
12701 return (struct dwo_unit *) *slot;
12703 if (signature_in_table == 0)
12705 hash = (hash + hash2) & mask;
12708 error (_("Dwarf Error: bad DWP hash table, lookup didn't terminate"
12709 " [in module %s]"),
12713 /* Subroutine of open_dwo_file,open_dwp_file to simplify them.
12714 Open the file specified by FILE_NAME and hand it off to BFD for
12715 preliminary analysis. Return a newly initialized bfd *, which
12716 includes a canonicalized copy of FILE_NAME.
12717 If IS_DWP is TRUE, we're opening a DWP file, otherwise a DWO file.
12718 SEARCH_CWD is true if the current directory is to be searched.
12719 It will be searched before debug-file-directory.
12720 If successful, the file is added to the bfd include table of the
12721 objfile's bfd (see gdb_bfd_record_inclusion).
12722 If unable to find/open the file, return NULL.
12723 NOTE: This function is derived from symfile_bfd_open. */
12725 static gdb_bfd_ref_ptr
12726 try_open_dwop_file (struct dwarf2_per_objfile *dwarf2_per_objfile,
12727 const char *file_name, int is_dwp, int search_cwd)
12730 /* Blech. OPF_TRY_CWD_FIRST also disables searching the path list if
12731 FILE_NAME contains a '/'. So we can't use it. Instead prepend "."
12732 to debug_file_directory. */
12733 const char *search_path;
12734 static const char dirname_separator_string[] = { DIRNAME_SEPARATOR, '\0' };
12736 gdb::unique_xmalloc_ptr<char> search_path_holder;
12739 if (*debug_file_directory != '\0')
12741 search_path_holder.reset (concat (".", dirname_separator_string,
12742 debug_file_directory,
12744 search_path = search_path_holder.get ();
12750 search_path = debug_file_directory;
12752 openp_flags flags = OPF_RETURN_REALPATH;
12754 flags |= OPF_SEARCH_IN_PATH;
12756 gdb::unique_xmalloc_ptr<char> absolute_name;
12757 desc = openp (search_path, flags, file_name,
12758 O_RDONLY | O_BINARY, &absolute_name);
12762 gdb_bfd_ref_ptr sym_bfd (gdb_bfd_open (absolute_name.get (),
12764 if (sym_bfd == NULL)
12766 bfd_set_cacheable (sym_bfd.get (), 1);
12768 if (!bfd_check_format (sym_bfd.get (), bfd_object))
12771 /* Success. Record the bfd as having been included by the objfile's bfd.
12772 This is important because things like demangled_names_hash lives in the
12773 objfile's per_bfd space and may have references to things like symbol
12774 names that live in the DWO/DWP file's per_bfd space. PR 16426. */
12775 gdb_bfd_record_inclusion (dwarf2_per_objfile->objfile->obfd, sym_bfd.get ());
12780 /* Try to open DWO file FILE_NAME.
12781 COMP_DIR is the DW_AT_comp_dir attribute.
12782 The result is the bfd handle of the file.
12783 If there is a problem finding or opening the file, return NULL.
12784 Upon success, the canonicalized path of the file is stored in the bfd,
12785 same as symfile_bfd_open. */
12787 static gdb_bfd_ref_ptr
12788 open_dwo_file (struct dwarf2_per_objfile *dwarf2_per_objfile,
12789 const char *file_name, const char *comp_dir)
12791 if (IS_ABSOLUTE_PATH (file_name))
12792 return try_open_dwop_file (dwarf2_per_objfile, file_name,
12793 0 /*is_dwp*/, 0 /*search_cwd*/);
12795 /* Before trying the search path, try DWO_NAME in COMP_DIR. */
12797 if (comp_dir != NULL)
12799 char *path_to_try = concat (comp_dir, SLASH_STRING,
12800 file_name, (char *) NULL);
12802 /* NOTE: If comp_dir is a relative path, this will also try the
12803 search path, which seems useful. */
12804 gdb_bfd_ref_ptr abfd (try_open_dwop_file (dwarf2_per_objfile,
12807 1 /*search_cwd*/));
12808 xfree (path_to_try);
12813 /* That didn't work, try debug-file-directory, which, despite its name,
12814 is a list of paths. */
12816 if (*debug_file_directory == '\0')
12819 return try_open_dwop_file (dwarf2_per_objfile, file_name,
12820 0 /*is_dwp*/, 1 /*search_cwd*/);
12823 /* This function is mapped across the sections and remembers the offset and
12824 size of each of the DWO debugging sections we are interested in. */
12827 dwarf2_locate_dwo_sections (bfd *abfd, asection *sectp, void *dwo_sections_ptr)
12829 struct dwo_sections *dwo_sections = (struct dwo_sections *) dwo_sections_ptr;
12830 const struct dwop_section_names *names = &dwop_section_names;
12832 if (section_is_p (sectp->name, &names->abbrev_dwo))
12834 dwo_sections->abbrev.s.section = sectp;
12835 dwo_sections->abbrev.size = bfd_get_section_size (sectp);
12837 else if (section_is_p (sectp->name, &names->info_dwo))
12839 dwo_sections->info.s.section = sectp;
12840 dwo_sections->info.size = bfd_get_section_size (sectp);
12842 else if (section_is_p (sectp->name, &names->line_dwo))
12844 dwo_sections->line.s.section = sectp;
12845 dwo_sections->line.size = bfd_get_section_size (sectp);
12847 else if (section_is_p (sectp->name, &names->loc_dwo))
12849 dwo_sections->loc.s.section = sectp;
12850 dwo_sections->loc.size = bfd_get_section_size (sectp);
12852 else if (section_is_p (sectp->name, &names->macinfo_dwo))
12854 dwo_sections->macinfo.s.section = sectp;
12855 dwo_sections->macinfo.size = bfd_get_section_size (sectp);
12857 else if (section_is_p (sectp->name, &names->macro_dwo))
12859 dwo_sections->macro.s.section = sectp;
12860 dwo_sections->macro.size = bfd_get_section_size (sectp);
12862 else if (section_is_p (sectp->name, &names->str_dwo))
12864 dwo_sections->str.s.section = sectp;
12865 dwo_sections->str.size = bfd_get_section_size (sectp);
12867 else if (section_is_p (sectp->name, &names->str_offsets_dwo))
12869 dwo_sections->str_offsets.s.section = sectp;
12870 dwo_sections->str_offsets.size = bfd_get_section_size (sectp);
12872 else if (section_is_p (sectp->name, &names->types_dwo))
12874 struct dwarf2_section_info type_section;
12876 memset (&type_section, 0, sizeof (type_section));
12877 type_section.s.section = sectp;
12878 type_section.size = bfd_get_section_size (sectp);
12879 VEC_safe_push (dwarf2_section_info_def, dwo_sections->types,
12884 /* Initialize the use of the DWO file specified by DWO_NAME and referenced
12885 by PER_CU. This is for the non-DWP case.
12886 The result is NULL if DWO_NAME can't be found. */
12888 static struct dwo_file *
12889 open_and_init_dwo_file (struct dwarf2_per_cu_data *per_cu,
12890 const char *dwo_name, const char *comp_dir)
12892 struct dwarf2_per_objfile *dwarf2_per_objfile = per_cu->dwarf2_per_objfile;
12893 struct objfile *objfile = dwarf2_per_objfile->objfile;
12895 gdb_bfd_ref_ptr dbfd (open_dwo_file (dwarf2_per_objfile, dwo_name, comp_dir));
12898 if (dwarf_read_debug)
12899 fprintf_unfiltered (gdb_stdlog, "DWO file not found: %s\n", dwo_name);
12903 /* We use a unique pointer here, despite the obstack allocation,
12904 because a dwo_file needs some cleanup if it is abandoned. */
12905 dwo_file_up dwo_file (OBSTACK_ZALLOC (&objfile->objfile_obstack,
12907 dwo_file->dwo_name = dwo_name;
12908 dwo_file->comp_dir = comp_dir;
12909 dwo_file->dbfd = dbfd.release ();
12911 bfd_map_over_sections (dwo_file->dbfd, dwarf2_locate_dwo_sections,
12912 &dwo_file->sections);
12914 create_cus_hash_table (dwarf2_per_objfile, *dwo_file, dwo_file->sections.info,
12917 create_debug_types_hash_table (dwarf2_per_objfile, dwo_file.get (),
12918 dwo_file->sections.types, dwo_file->tus);
12920 if (dwarf_read_debug)
12921 fprintf_unfiltered (gdb_stdlog, "DWO file found: %s\n", dwo_name);
12923 return dwo_file.release ();
12926 /* This function is mapped across the sections and remembers the offset and
12927 size of each of the DWP debugging sections common to version 1 and 2 that
12928 we are interested in. */
12931 dwarf2_locate_common_dwp_sections (bfd *abfd, asection *sectp,
12932 void *dwp_file_ptr)
12934 struct dwp_file *dwp_file = (struct dwp_file *) dwp_file_ptr;
12935 const struct dwop_section_names *names = &dwop_section_names;
12936 unsigned int elf_section_nr = elf_section_data (sectp)->this_idx;
12938 /* Record the ELF section number for later lookup: this is what the
12939 .debug_cu_index,.debug_tu_index tables use in DWP V1. */
12940 gdb_assert (elf_section_nr < dwp_file->num_sections);
12941 dwp_file->elf_sections[elf_section_nr] = sectp;
12943 /* Look for specific sections that we need. */
12944 if (section_is_p (sectp->name, &names->str_dwo))
12946 dwp_file->sections.str.s.section = sectp;
12947 dwp_file->sections.str.size = bfd_get_section_size (sectp);
12949 else if (section_is_p (sectp->name, &names->cu_index))
12951 dwp_file->sections.cu_index.s.section = sectp;
12952 dwp_file->sections.cu_index.size = bfd_get_section_size (sectp);
12954 else if (section_is_p (sectp->name, &names->tu_index))
12956 dwp_file->sections.tu_index.s.section = sectp;
12957 dwp_file->sections.tu_index.size = bfd_get_section_size (sectp);
12961 /* This function is mapped across the sections and remembers the offset and
12962 size of each of the DWP version 2 debugging sections that we are interested
12963 in. This is split into a separate function because we don't know if we
12964 have version 1 or 2 until we parse the cu_index/tu_index sections. */
12967 dwarf2_locate_v2_dwp_sections (bfd *abfd, asection *sectp, void *dwp_file_ptr)
12969 struct dwp_file *dwp_file = (struct dwp_file *) dwp_file_ptr;
12970 const struct dwop_section_names *names = &dwop_section_names;
12971 unsigned int elf_section_nr = elf_section_data (sectp)->this_idx;
12973 /* Record the ELF section number for later lookup: this is what the
12974 .debug_cu_index,.debug_tu_index tables use in DWP V1. */
12975 gdb_assert (elf_section_nr < dwp_file->num_sections);
12976 dwp_file->elf_sections[elf_section_nr] = sectp;
12978 /* Look for specific sections that we need. */
12979 if (section_is_p (sectp->name, &names->abbrev_dwo))
12981 dwp_file->sections.abbrev.s.section = sectp;
12982 dwp_file->sections.abbrev.size = bfd_get_section_size (sectp);
12984 else if (section_is_p (sectp->name, &names->info_dwo))
12986 dwp_file->sections.info.s.section = sectp;
12987 dwp_file->sections.info.size = bfd_get_section_size (sectp);
12989 else if (section_is_p (sectp->name, &names->line_dwo))
12991 dwp_file->sections.line.s.section = sectp;
12992 dwp_file->sections.line.size = bfd_get_section_size (sectp);
12994 else if (section_is_p (sectp->name, &names->loc_dwo))
12996 dwp_file->sections.loc.s.section = sectp;
12997 dwp_file->sections.loc.size = bfd_get_section_size (sectp);
12999 else if (section_is_p (sectp->name, &names->macinfo_dwo))
13001 dwp_file->sections.macinfo.s.section = sectp;
13002 dwp_file->sections.macinfo.size = bfd_get_section_size (sectp);
13004 else if (section_is_p (sectp->name, &names->macro_dwo))
13006 dwp_file->sections.macro.s.section = sectp;
13007 dwp_file->sections.macro.size = bfd_get_section_size (sectp);
13009 else if (section_is_p (sectp->name, &names->str_offsets_dwo))
13011 dwp_file->sections.str_offsets.s.section = sectp;
13012 dwp_file->sections.str_offsets.size = bfd_get_section_size (sectp);
13014 else if (section_is_p (sectp->name, &names->types_dwo))
13016 dwp_file->sections.types.s.section = sectp;
13017 dwp_file->sections.types.size = bfd_get_section_size (sectp);
13021 /* Hash function for dwp_file loaded CUs/TUs. */
13024 hash_dwp_loaded_cutus (const void *item)
13026 const struct dwo_unit *dwo_unit = (const struct dwo_unit *) item;
13028 /* This drops the top 32 bits of the signature, but is ok for a hash. */
13029 return dwo_unit->signature;
13032 /* Equality function for dwp_file loaded CUs/TUs. */
13035 eq_dwp_loaded_cutus (const void *a, const void *b)
13037 const struct dwo_unit *dua = (const struct dwo_unit *) a;
13038 const struct dwo_unit *dub = (const struct dwo_unit *) b;
13040 return dua->signature == dub->signature;
13043 /* Allocate a hash table for dwp_file loaded CUs/TUs. */
13046 allocate_dwp_loaded_cutus_table (struct objfile *objfile)
13048 return htab_create_alloc_ex (3,
13049 hash_dwp_loaded_cutus,
13050 eq_dwp_loaded_cutus,
13052 &objfile->objfile_obstack,
13053 hashtab_obstack_allocate,
13054 dummy_obstack_deallocate);
13057 /* Try to open DWP file FILE_NAME.
13058 The result is the bfd handle of the file.
13059 If there is a problem finding or opening the file, return NULL.
13060 Upon success, the canonicalized path of the file is stored in the bfd,
13061 same as symfile_bfd_open. */
13063 static gdb_bfd_ref_ptr
13064 open_dwp_file (struct dwarf2_per_objfile *dwarf2_per_objfile,
13065 const char *file_name)
13067 gdb_bfd_ref_ptr abfd (try_open_dwop_file (dwarf2_per_objfile, file_name,
13069 1 /*search_cwd*/));
13073 /* Work around upstream bug 15652.
13074 http://sourceware.org/bugzilla/show_bug.cgi?id=15652
13075 [Whether that's a "bug" is debatable, but it is getting in our way.]
13076 We have no real idea where the dwp file is, because gdb's realpath-ing
13077 of the executable's path may have discarded the needed info.
13078 [IWBN if the dwp file name was recorded in the executable, akin to
13079 .gnu_debuglink, but that doesn't exist yet.]
13080 Strip the directory from FILE_NAME and search again. */
13081 if (*debug_file_directory != '\0')
13083 /* Don't implicitly search the current directory here.
13084 If the user wants to search "." to handle this case,
13085 it must be added to debug-file-directory. */
13086 return try_open_dwop_file (dwarf2_per_objfile,
13087 lbasename (file_name), 1 /*is_dwp*/,
13094 /* Initialize the use of the DWP file for the current objfile.
13095 By convention the name of the DWP file is ${objfile}.dwp.
13096 The result is NULL if it can't be found. */
13098 static struct dwp_file *
13099 open_and_init_dwp_file (struct dwarf2_per_objfile *dwarf2_per_objfile)
13101 struct objfile *objfile = dwarf2_per_objfile->objfile;
13102 struct dwp_file *dwp_file;
13104 /* Try to find first .dwp for the binary file before any symbolic links
13107 /* If the objfile is a debug file, find the name of the real binary
13108 file and get the name of dwp file from there. */
13109 std::string dwp_name;
13110 if (objfile->separate_debug_objfile_backlink != NULL)
13112 struct objfile *backlink = objfile->separate_debug_objfile_backlink;
13113 const char *backlink_basename = lbasename (backlink->original_name);
13115 dwp_name = ldirname (objfile->original_name) + SLASH_STRING + backlink_basename;
13118 dwp_name = objfile->original_name;
13120 dwp_name += ".dwp";
13122 gdb_bfd_ref_ptr dbfd (open_dwp_file (dwarf2_per_objfile, dwp_name.c_str ()));
13124 && strcmp (objfile->original_name, objfile_name (objfile)) != 0)
13126 /* Try to find .dwp for the binary file after gdb_realpath resolving. */
13127 dwp_name = objfile_name (objfile);
13128 dwp_name += ".dwp";
13129 dbfd = open_dwp_file (dwarf2_per_objfile, dwp_name.c_str ());
13134 if (dwarf_read_debug)
13135 fprintf_unfiltered (gdb_stdlog, "DWP file not found: %s\n", dwp_name.c_str ());
13138 dwp_file = OBSTACK_ZALLOC (&objfile->objfile_obstack, struct dwp_file);
13139 dwp_file->name = bfd_get_filename (dbfd.get ());
13140 dwp_file->dbfd = dbfd.release ();
13142 /* +1: section 0 is unused */
13143 dwp_file->num_sections = bfd_count_sections (dwp_file->dbfd) + 1;
13144 dwp_file->elf_sections =
13145 OBSTACK_CALLOC (&objfile->objfile_obstack,
13146 dwp_file->num_sections, asection *);
13148 bfd_map_over_sections (dwp_file->dbfd, dwarf2_locate_common_dwp_sections,
13151 dwp_file->cus = create_dwp_hash_table (dwarf2_per_objfile, dwp_file, 0);
13153 dwp_file->tus = create_dwp_hash_table (dwarf2_per_objfile, dwp_file, 1);
13155 /* The DWP file version is stored in the hash table. Oh well. */
13156 if (dwp_file->cus && dwp_file->tus
13157 && dwp_file->cus->version != dwp_file->tus->version)
13159 /* Technically speaking, we should try to limp along, but this is
13160 pretty bizarre. We use pulongest here because that's the established
13161 portability solution (e.g, we cannot use %u for uint32_t). */
13162 error (_("Dwarf Error: DWP file CU version %s doesn't match"
13163 " TU version %s [in DWP file %s]"),
13164 pulongest (dwp_file->cus->version),
13165 pulongest (dwp_file->tus->version), dwp_name.c_str ());
13169 dwp_file->version = dwp_file->cus->version;
13170 else if (dwp_file->tus)
13171 dwp_file->version = dwp_file->tus->version;
13173 dwp_file->version = 2;
13175 if (dwp_file->version == 2)
13176 bfd_map_over_sections (dwp_file->dbfd, dwarf2_locate_v2_dwp_sections,
13179 dwp_file->loaded_cus = allocate_dwp_loaded_cutus_table (objfile);
13180 dwp_file->loaded_tus = allocate_dwp_loaded_cutus_table (objfile);
13182 if (dwarf_read_debug)
13184 fprintf_unfiltered (gdb_stdlog, "DWP file found: %s\n", dwp_file->name);
13185 fprintf_unfiltered (gdb_stdlog,
13186 " %s CUs, %s TUs\n",
13187 pulongest (dwp_file->cus ? dwp_file->cus->nr_units : 0),
13188 pulongest (dwp_file->tus ? dwp_file->tus->nr_units : 0));
13194 /* Wrapper around open_and_init_dwp_file, only open it once. */
13196 static struct dwp_file *
13197 get_dwp_file (struct dwarf2_per_objfile *dwarf2_per_objfile)
13199 if (! dwarf2_per_objfile->dwp_checked)
13201 dwarf2_per_objfile->dwp_file
13202 = open_and_init_dwp_file (dwarf2_per_objfile);
13203 dwarf2_per_objfile->dwp_checked = 1;
13205 return dwarf2_per_objfile->dwp_file;
13208 /* Subroutine of lookup_dwo_comp_unit, lookup_dwo_type_unit.
13209 Look up the CU/TU with signature SIGNATURE, either in DWO file DWO_NAME
13210 or in the DWP file for the objfile, referenced by THIS_UNIT.
13211 If non-NULL, comp_dir is the DW_AT_comp_dir attribute.
13212 IS_DEBUG_TYPES is non-zero if reading a TU, otherwise read a CU.
13214 This is called, for example, when wanting to read a variable with a
13215 complex location. Therefore we don't want to do file i/o for every call.
13216 Therefore we don't want to look for a DWO file on every call.
13217 Therefore we first see if we've already seen SIGNATURE in a DWP file,
13218 then we check if we've already seen DWO_NAME, and only THEN do we check
13221 The result is a pointer to the dwo_unit object or NULL if we didn't find it
13222 (dwo_id mismatch or couldn't find the DWO/DWP file). */
13224 static struct dwo_unit *
13225 lookup_dwo_cutu (struct dwarf2_per_cu_data *this_unit,
13226 const char *dwo_name, const char *comp_dir,
13227 ULONGEST signature, int is_debug_types)
13229 struct dwarf2_per_objfile *dwarf2_per_objfile = this_unit->dwarf2_per_objfile;
13230 struct objfile *objfile = dwarf2_per_objfile->objfile;
13231 const char *kind = is_debug_types ? "TU" : "CU";
13232 void **dwo_file_slot;
13233 struct dwo_file *dwo_file;
13234 struct dwp_file *dwp_file;
13236 /* First see if there's a DWP file.
13237 If we have a DWP file but didn't find the DWO inside it, don't
13238 look for the original DWO file. It makes gdb behave differently
13239 depending on whether one is debugging in the build tree. */
13241 dwp_file = get_dwp_file (dwarf2_per_objfile);
13242 if (dwp_file != NULL)
13244 const struct dwp_hash_table *dwp_htab =
13245 is_debug_types ? dwp_file->tus : dwp_file->cus;
13247 if (dwp_htab != NULL)
13249 struct dwo_unit *dwo_cutu =
13250 lookup_dwo_unit_in_dwp (dwarf2_per_objfile, dwp_file, comp_dir,
13251 signature, is_debug_types);
13253 if (dwo_cutu != NULL)
13255 if (dwarf_read_debug)
13257 fprintf_unfiltered (gdb_stdlog,
13258 "Virtual DWO %s %s found: @%s\n",
13259 kind, hex_string (signature),
13260 host_address_to_string (dwo_cutu));
13268 /* No DWP file, look for the DWO file. */
13270 dwo_file_slot = lookup_dwo_file_slot (dwarf2_per_objfile,
13271 dwo_name, comp_dir);
13272 if (*dwo_file_slot == NULL)
13274 /* Read in the file and build a table of the CUs/TUs it contains. */
13275 *dwo_file_slot = open_and_init_dwo_file (this_unit, dwo_name, comp_dir);
13277 /* NOTE: This will be NULL if unable to open the file. */
13278 dwo_file = (struct dwo_file *) *dwo_file_slot;
13280 if (dwo_file != NULL)
13282 struct dwo_unit *dwo_cutu = NULL;
13284 if (is_debug_types && dwo_file->tus)
13286 struct dwo_unit find_dwo_cutu;
13288 memset (&find_dwo_cutu, 0, sizeof (find_dwo_cutu));
13289 find_dwo_cutu.signature = signature;
13291 = (struct dwo_unit *) htab_find (dwo_file->tus, &find_dwo_cutu);
13293 else if (!is_debug_types && dwo_file->cus)
13295 struct dwo_unit find_dwo_cutu;
13297 memset (&find_dwo_cutu, 0, sizeof (find_dwo_cutu));
13298 find_dwo_cutu.signature = signature;
13299 dwo_cutu = (struct dwo_unit *)htab_find (dwo_file->cus,
13303 if (dwo_cutu != NULL)
13305 if (dwarf_read_debug)
13307 fprintf_unfiltered (gdb_stdlog, "DWO %s %s(%s) found: @%s\n",
13308 kind, dwo_name, hex_string (signature),
13309 host_address_to_string (dwo_cutu));
13316 /* We didn't find it. This could mean a dwo_id mismatch, or
13317 someone deleted the DWO/DWP file, or the search path isn't set up
13318 correctly to find the file. */
13320 if (dwarf_read_debug)
13322 fprintf_unfiltered (gdb_stdlog, "DWO %s %s(%s) not found\n",
13323 kind, dwo_name, hex_string (signature));
13326 /* This is a warning and not a complaint because it can be caused by
13327 pilot error (e.g., user accidentally deleting the DWO). */
13329 /* Print the name of the DWP file if we looked there, helps the user
13330 better diagnose the problem. */
13331 std::string dwp_text;
13333 if (dwp_file != NULL)
13334 dwp_text = string_printf (" [in DWP file %s]",
13335 lbasename (dwp_file->name));
13337 warning (_("Could not find DWO %s %s(%s)%s referenced by %s at offset %s"
13338 " [in module %s]"),
13339 kind, dwo_name, hex_string (signature),
13341 this_unit->is_debug_types ? "TU" : "CU",
13342 sect_offset_str (this_unit->sect_off), objfile_name (objfile));
13347 /* Lookup the DWO CU DWO_NAME/SIGNATURE referenced from THIS_CU.
13348 See lookup_dwo_cutu_unit for details. */
13350 static struct dwo_unit *
13351 lookup_dwo_comp_unit (struct dwarf2_per_cu_data *this_cu,
13352 const char *dwo_name, const char *comp_dir,
13353 ULONGEST signature)
13355 return lookup_dwo_cutu (this_cu, dwo_name, comp_dir, signature, 0);
13358 /* Lookup the DWO TU DWO_NAME/SIGNATURE referenced from THIS_TU.
13359 See lookup_dwo_cutu_unit for details. */
13361 static struct dwo_unit *
13362 lookup_dwo_type_unit (struct signatured_type *this_tu,
13363 const char *dwo_name, const char *comp_dir)
13365 return lookup_dwo_cutu (&this_tu->per_cu, dwo_name, comp_dir, this_tu->signature, 1);
13368 /* Traversal function for queue_and_load_all_dwo_tus. */
13371 queue_and_load_dwo_tu (void **slot, void *info)
13373 struct dwo_unit *dwo_unit = (struct dwo_unit *) *slot;
13374 struct dwarf2_per_cu_data *per_cu = (struct dwarf2_per_cu_data *) info;
13375 ULONGEST signature = dwo_unit->signature;
13376 struct signatured_type *sig_type =
13377 lookup_dwo_signatured_type (per_cu->cu, signature);
13379 if (sig_type != NULL)
13381 struct dwarf2_per_cu_data *sig_cu = &sig_type->per_cu;
13383 /* We pass NULL for DEPENDENT_CU because we don't yet know if there's
13384 a real dependency of PER_CU on SIG_TYPE. That is detected later
13385 while processing PER_CU. */
13386 if (maybe_queue_comp_unit (NULL, sig_cu, per_cu->cu->language))
13387 load_full_type_unit (sig_cu);
13388 VEC_safe_push (dwarf2_per_cu_ptr, per_cu->imported_symtabs, sig_cu);
13394 /* Queue all TUs contained in the DWO of PER_CU to be read in.
13395 The DWO may have the only definition of the type, though it may not be
13396 referenced anywhere in PER_CU. Thus we have to load *all* its TUs.
13397 http://sourceware.org/bugzilla/show_bug.cgi?id=15021 */
13400 queue_and_load_all_dwo_tus (struct dwarf2_per_cu_data *per_cu)
13402 struct dwo_unit *dwo_unit;
13403 struct dwo_file *dwo_file;
13405 gdb_assert (!per_cu->is_debug_types);
13406 gdb_assert (get_dwp_file (per_cu->dwarf2_per_objfile) == NULL);
13407 gdb_assert (per_cu->cu != NULL);
13409 dwo_unit = per_cu->cu->dwo_unit;
13410 gdb_assert (dwo_unit != NULL);
13412 dwo_file = dwo_unit->dwo_file;
13413 if (dwo_file->tus != NULL)
13414 htab_traverse_noresize (dwo_file->tus, queue_and_load_dwo_tu, per_cu);
13417 /* Free all resources associated with DWO_FILE.
13418 Close the DWO file and munmap the sections. */
13421 free_dwo_file (struct dwo_file *dwo_file)
13423 /* Note: dbfd is NULL for virtual DWO files. */
13424 gdb_bfd_unref (dwo_file->dbfd);
13426 VEC_free (dwarf2_section_info_def, dwo_file->sections.types);
13429 /* Traversal function for free_dwo_files. */
13432 free_dwo_file_from_slot (void **slot, void *info)
13434 struct dwo_file *dwo_file = (struct dwo_file *) *slot;
13436 free_dwo_file (dwo_file);
13441 /* Free all resources associated with DWO_FILES. */
13444 free_dwo_files (htab_t dwo_files, struct objfile *objfile)
13446 htab_traverse_noresize (dwo_files, free_dwo_file_from_slot, objfile);
13449 /* Read in various DIEs. */
13451 /* DW_AT_abstract_origin inherits whole DIEs (not just their attributes).
13452 Inherit only the children of the DW_AT_abstract_origin DIE not being
13453 already referenced by DW_AT_abstract_origin from the children of the
13457 inherit_abstract_dies (struct die_info *die, struct dwarf2_cu *cu)
13459 struct die_info *child_die;
13460 sect_offset *offsetp;
13461 /* Parent of DIE - referenced by DW_AT_abstract_origin. */
13462 struct die_info *origin_die;
13463 /* Iterator of the ORIGIN_DIE children. */
13464 struct die_info *origin_child_die;
13465 struct attribute *attr;
13466 struct dwarf2_cu *origin_cu;
13467 struct pending **origin_previous_list_in_scope;
13469 attr = dwarf2_attr (die, DW_AT_abstract_origin, cu);
13473 /* Note that following die references may follow to a die in a
13477 origin_die = follow_die_ref (die, attr, &origin_cu);
13479 /* We're inheriting ORIGIN's children into the scope we'd put DIE's
13481 origin_previous_list_in_scope = origin_cu->list_in_scope;
13482 origin_cu->list_in_scope = cu->list_in_scope;
13484 if (die->tag != origin_die->tag
13485 && !(die->tag == DW_TAG_inlined_subroutine
13486 && origin_die->tag == DW_TAG_subprogram))
13487 complaint (&symfile_complaints,
13488 _("DIE %s and its abstract origin %s have different tags"),
13489 sect_offset_str (die->sect_off),
13490 sect_offset_str (origin_die->sect_off));
13492 std::vector<sect_offset> offsets;
13494 for (child_die = die->child;
13495 child_die && child_die->tag;
13496 child_die = sibling_die (child_die))
13498 struct die_info *child_origin_die;
13499 struct dwarf2_cu *child_origin_cu;
13501 /* We are trying to process concrete instance entries:
13502 DW_TAG_call_site DIEs indeed have a DW_AT_abstract_origin tag, but
13503 it's not relevant to our analysis here. i.e. detecting DIEs that are
13504 present in the abstract instance but not referenced in the concrete
13506 if (child_die->tag == DW_TAG_call_site
13507 || child_die->tag == DW_TAG_GNU_call_site)
13510 /* For each CHILD_DIE, find the corresponding child of
13511 ORIGIN_DIE. If there is more than one layer of
13512 DW_AT_abstract_origin, follow them all; there shouldn't be,
13513 but GCC versions at least through 4.4 generate this (GCC PR
13515 child_origin_die = child_die;
13516 child_origin_cu = cu;
13519 attr = dwarf2_attr (child_origin_die, DW_AT_abstract_origin,
13523 child_origin_die = follow_die_ref (child_origin_die, attr,
13527 /* According to DWARF3 3.3.8.2 #3 new entries without their abstract
13528 counterpart may exist. */
13529 if (child_origin_die != child_die)
13531 if (child_die->tag != child_origin_die->tag
13532 && !(child_die->tag == DW_TAG_inlined_subroutine
13533 && child_origin_die->tag == DW_TAG_subprogram))
13534 complaint (&symfile_complaints,
13535 _("Child DIE %s and its abstract origin %s have "
13537 sect_offset_str (child_die->sect_off),
13538 sect_offset_str (child_origin_die->sect_off));
13539 if (child_origin_die->parent != origin_die)
13540 complaint (&symfile_complaints,
13541 _("Child DIE %s and its abstract origin %s have "
13542 "different parents"),
13543 sect_offset_str (child_die->sect_off),
13544 sect_offset_str (child_origin_die->sect_off));
13546 offsets.push_back (child_origin_die->sect_off);
13549 std::sort (offsets.begin (), offsets.end ());
13550 sect_offset *offsets_end = offsets.data () + offsets.size ();
13551 for (offsetp = offsets.data () + 1; offsetp < offsets_end; offsetp++)
13552 if (offsetp[-1] == *offsetp)
13553 complaint (&symfile_complaints,
13554 _("Multiple children of DIE %s refer "
13555 "to DIE %s as their abstract origin"),
13556 sect_offset_str (die->sect_off), sect_offset_str (*offsetp));
13558 offsetp = offsets.data ();
13559 origin_child_die = origin_die->child;
13560 while (origin_child_die && origin_child_die->tag)
13562 /* Is ORIGIN_CHILD_DIE referenced by any of the DIE children? */
13563 while (offsetp < offsets_end
13564 && *offsetp < origin_child_die->sect_off)
13566 if (offsetp >= offsets_end
13567 || *offsetp > origin_child_die->sect_off)
13569 /* Found that ORIGIN_CHILD_DIE is really not referenced.
13570 Check whether we're already processing ORIGIN_CHILD_DIE.
13571 This can happen with mutually referenced abstract_origins.
13573 if (!origin_child_die->in_process)
13574 process_die (origin_child_die, origin_cu);
13576 origin_child_die = sibling_die (origin_child_die);
13578 origin_cu->list_in_scope = origin_previous_list_in_scope;
13582 read_func_scope (struct die_info *die, struct dwarf2_cu *cu)
13584 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
13585 struct gdbarch *gdbarch = get_objfile_arch (objfile);
13586 struct context_stack *newobj;
13589 struct die_info *child_die;
13590 struct attribute *attr, *call_line, *call_file;
13592 CORE_ADDR baseaddr;
13593 struct block *block;
13594 int inlined_func = (die->tag == DW_TAG_inlined_subroutine);
13595 std::vector<struct symbol *> template_args;
13596 struct template_symbol *templ_func = NULL;
13600 /* If we do not have call site information, we can't show the
13601 caller of this inlined function. That's too confusing, so
13602 only use the scope for local variables. */
13603 call_line = dwarf2_attr (die, DW_AT_call_line, cu);
13604 call_file = dwarf2_attr (die, DW_AT_call_file, cu);
13605 if (call_line == NULL || call_file == NULL)
13607 read_lexical_block_scope (die, cu);
13612 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
13614 name = dwarf2_name (die, cu);
13616 /* Ignore functions with missing or empty names. These are actually
13617 illegal according to the DWARF standard. */
13620 complaint (&symfile_complaints,
13621 _("missing name for subprogram DIE at %s"),
13622 sect_offset_str (die->sect_off));
13626 /* Ignore functions with missing or invalid low and high pc attributes. */
13627 if (dwarf2_get_pc_bounds (die, &lowpc, &highpc, cu, NULL)
13628 <= PC_BOUNDS_INVALID)
13630 attr = dwarf2_attr (die, DW_AT_external, cu);
13631 if (!attr || !DW_UNSND (attr))
13632 complaint (&symfile_complaints,
13633 _("cannot get low and high bounds "
13634 "for subprogram DIE at %s"),
13635 sect_offset_str (die->sect_off));
13639 lowpc = gdbarch_adjust_dwarf2_addr (gdbarch, lowpc + baseaddr);
13640 highpc = gdbarch_adjust_dwarf2_addr (gdbarch, highpc + baseaddr);
13642 /* If we have any template arguments, then we must allocate a
13643 different sort of symbol. */
13644 for (child_die = die->child; child_die; child_die = sibling_die (child_die))
13646 if (child_die->tag == DW_TAG_template_type_param
13647 || child_die->tag == DW_TAG_template_value_param)
13649 templ_func = allocate_template_symbol (objfile);
13650 templ_func->subclass = SYMBOL_TEMPLATE;
13655 newobj = push_context (0, lowpc);
13656 newobj->name = new_symbol (die, read_type_die (die, cu), cu,
13657 (struct symbol *) templ_func);
13659 /* If there is a location expression for DW_AT_frame_base, record
13661 attr = dwarf2_attr (die, DW_AT_frame_base, cu);
13663 dwarf2_symbol_mark_computed (attr, newobj->name, cu, 1);
13665 /* If there is a location for the static link, record it. */
13666 newobj->static_link = NULL;
13667 attr = dwarf2_attr (die, DW_AT_static_link, cu);
13670 newobj->static_link
13671 = XOBNEW (&objfile->objfile_obstack, struct dynamic_prop);
13672 attr_to_dynamic_prop (attr, die, cu, newobj->static_link);
13675 cu->list_in_scope = &local_symbols;
13677 if (die->child != NULL)
13679 child_die = die->child;
13680 while (child_die && child_die->tag)
13682 if (child_die->tag == DW_TAG_template_type_param
13683 || child_die->tag == DW_TAG_template_value_param)
13685 struct symbol *arg = new_symbol (child_die, NULL, cu);
13688 template_args.push_back (arg);
13691 process_die (child_die, cu);
13692 child_die = sibling_die (child_die);
13696 inherit_abstract_dies (die, cu);
13698 /* If we have a DW_AT_specification, we might need to import using
13699 directives from the context of the specification DIE. See the
13700 comment in determine_prefix. */
13701 if (cu->language == language_cplus
13702 && dwarf2_attr (die, DW_AT_specification, cu))
13704 struct dwarf2_cu *spec_cu = cu;
13705 struct die_info *spec_die = die_specification (die, &spec_cu);
13709 child_die = spec_die->child;
13710 while (child_die && child_die->tag)
13712 if (child_die->tag == DW_TAG_imported_module)
13713 process_die (child_die, spec_cu);
13714 child_die = sibling_die (child_die);
13717 /* In some cases, GCC generates specification DIEs that
13718 themselves contain DW_AT_specification attributes. */
13719 spec_die = die_specification (spec_die, &spec_cu);
13723 newobj = pop_context ();
13724 /* Make a block for the local symbols within. */
13725 block = finish_block (newobj->name, &local_symbols, newobj->old_blocks,
13726 newobj->static_link, lowpc, highpc);
13728 /* For C++, set the block's scope. */
13729 if ((cu->language == language_cplus
13730 || cu->language == language_fortran
13731 || cu->language == language_d
13732 || cu->language == language_rust)
13733 && cu->processing_has_namespace_info)
13734 block_set_scope (block, determine_prefix (die, cu),
13735 &objfile->objfile_obstack);
13737 /* If we have address ranges, record them. */
13738 dwarf2_record_block_ranges (die, block, baseaddr, cu);
13740 gdbarch_make_symbol_special (gdbarch, newobj->name, objfile);
13742 /* Attach template arguments to function. */
13743 if (!template_args.empty ())
13745 gdb_assert (templ_func != NULL);
13747 templ_func->n_template_arguments = template_args.size ();
13748 templ_func->template_arguments
13749 = XOBNEWVEC (&objfile->objfile_obstack, struct symbol *,
13750 templ_func->n_template_arguments);
13751 memcpy (templ_func->template_arguments,
13752 template_args.data (),
13753 (templ_func->n_template_arguments * sizeof (struct symbol *)));
13756 /* In C++, we can have functions nested inside functions (e.g., when
13757 a function declares a class that has methods). This means that
13758 when we finish processing a function scope, we may need to go
13759 back to building a containing block's symbol lists. */
13760 local_symbols = newobj->locals;
13761 local_using_directives = newobj->local_using_directives;
13763 /* If we've finished processing a top-level function, subsequent
13764 symbols go in the file symbol list. */
13765 if (outermost_context_p ())
13766 cu->list_in_scope = &file_symbols;
13769 /* Process all the DIES contained within a lexical block scope. Start
13770 a new scope, process the dies, and then close the scope. */
13773 read_lexical_block_scope (struct die_info *die, struct dwarf2_cu *cu)
13775 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
13776 struct gdbarch *gdbarch = get_objfile_arch (objfile);
13777 struct context_stack *newobj;
13778 CORE_ADDR lowpc, highpc;
13779 struct die_info *child_die;
13780 CORE_ADDR baseaddr;
13782 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
13784 /* Ignore blocks with missing or invalid low and high pc attributes. */
13785 /* ??? Perhaps consider discontiguous blocks defined by DW_AT_ranges
13786 as multiple lexical blocks? Handling children in a sane way would
13787 be nasty. Might be easier to properly extend generic blocks to
13788 describe ranges. */
13789 switch (dwarf2_get_pc_bounds (die, &lowpc, &highpc, cu, NULL))
13791 case PC_BOUNDS_NOT_PRESENT:
13792 /* DW_TAG_lexical_block has no attributes, process its children as if
13793 there was no wrapping by that DW_TAG_lexical_block.
13794 GCC does no longer produces such DWARF since GCC r224161. */
13795 for (child_die = die->child;
13796 child_die != NULL && child_die->tag;
13797 child_die = sibling_die (child_die))
13798 process_die (child_die, cu);
13800 case PC_BOUNDS_INVALID:
13803 lowpc = gdbarch_adjust_dwarf2_addr (gdbarch, lowpc + baseaddr);
13804 highpc = gdbarch_adjust_dwarf2_addr (gdbarch, highpc + baseaddr);
13806 push_context (0, lowpc);
13807 if (die->child != NULL)
13809 child_die = die->child;
13810 while (child_die && child_die->tag)
13812 process_die (child_die, cu);
13813 child_die = sibling_die (child_die);
13816 inherit_abstract_dies (die, cu);
13817 newobj = pop_context ();
13819 if (local_symbols != NULL || local_using_directives != NULL)
13821 struct block *block
13822 = finish_block (0, &local_symbols, newobj->old_blocks, NULL,
13823 newobj->start_addr, highpc);
13825 /* Note that recording ranges after traversing children, as we
13826 do here, means that recording a parent's ranges entails
13827 walking across all its children's ranges as they appear in
13828 the address map, which is quadratic behavior.
13830 It would be nicer to record the parent's ranges before
13831 traversing its children, simply overriding whatever you find
13832 there. But since we don't even decide whether to create a
13833 block until after we've traversed its children, that's hard
13835 dwarf2_record_block_ranges (die, block, baseaddr, cu);
13837 local_symbols = newobj->locals;
13838 local_using_directives = newobj->local_using_directives;
13841 /* Read in DW_TAG_call_site and insert it to CU->call_site_htab. */
13844 read_call_site_scope (struct die_info *die, struct dwarf2_cu *cu)
13846 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
13847 struct gdbarch *gdbarch = get_objfile_arch (objfile);
13848 CORE_ADDR pc, baseaddr;
13849 struct attribute *attr;
13850 struct call_site *call_site, call_site_local;
13853 struct die_info *child_die;
13855 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
13857 attr = dwarf2_attr (die, DW_AT_call_return_pc, cu);
13860 /* This was a pre-DWARF-5 GNU extension alias
13861 for DW_AT_call_return_pc. */
13862 attr = dwarf2_attr (die, DW_AT_low_pc, cu);
13866 complaint (&symfile_complaints,
13867 _("missing DW_AT_call_return_pc for DW_TAG_call_site "
13868 "DIE %s [in module %s]"),
13869 sect_offset_str (die->sect_off), objfile_name (objfile));
13872 pc = attr_value_as_address (attr) + baseaddr;
13873 pc = gdbarch_adjust_dwarf2_addr (gdbarch, pc);
13875 if (cu->call_site_htab == NULL)
13876 cu->call_site_htab = htab_create_alloc_ex (16, core_addr_hash, core_addr_eq,
13877 NULL, &objfile->objfile_obstack,
13878 hashtab_obstack_allocate, NULL);
13879 call_site_local.pc = pc;
13880 slot = htab_find_slot (cu->call_site_htab, &call_site_local, INSERT);
13883 complaint (&symfile_complaints,
13884 _("Duplicate PC %s for DW_TAG_call_site "
13885 "DIE %s [in module %s]"),
13886 paddress (gdbarch, pc), sect_offset_str (die->sect_off),
13887 objfile_name (objfile));
13891 /* Count parameters at the caller. */
13894 for (child_die = die->child; child_die && child_die->tag;
13895 child_die = sibling_die (child_die))
13897 if (child_die->tag != DW_TAG_call_site_parameter
13898 && child_die->tag != DW_TAG_GNU_call_site_parameter)
13900 complaint (&symfile_complaints,
13901 _("Tag %d is not DW_TAG_call_site_parameter in "
13902 "DW_TAG_call_site child DIE %s [in module %s]"),
13903 child_die->tag, sect_offset_str (child_die->sect_off),
13904 objfile_name (objfile));
13912 = ((struct call_site *)
13913 obstack_alloc (&objfile->objfile_obstack,
13914 sizeof (*call_site)
13915 + (sizeof (*call_site->parameter) * (nparams - 1))));
13917 memset (call_site, 0, sizeof (*call_site) - sizeof (*call_site->parameter));
13918 call_site->pc = pc;
13920 if (dwarf2_flag_true_p (die, DW_AT_call_tail_call, cu)
13921 || dwarf2_flag_true_p (die, DW_AT_GNU_tail_call, cu))
13923 struct die_info *func_die;
13925 /* Skip also over DW_TAG_inlined_subroutine. */
13926 for (func_die = die->parent;
13927 func_die && func_die->tag != DW_TAG_subprogram
13928 && func_die->tag != DW_TAG_subroutine_type;
13929 func_die = func_die->parent);
13931 /* DW_AT_call_all_calls is a superset
13932 of DW_AT_call_all_tail_calls. */
13934 && !dwarf2_flag_true_p (func_die, DW_AT_call_all_calls, cu)
13935 && !dwarf2_flag_true_p (func_die, DW_AT_GNU_all_call_sites, cu)
13936 && !dwarf2_flag_true_p (func_die, DW_AT_call_all_tail_calls, cu)
13937 && !dwarf2_flag_true_p (func_die, DW_AT_GNU_all_tail_call_sites, cu))
13939 /* TYPE_TAIL_CALL_LIST is not interesting in functions where it is
13940 not complete. But keep CALL_SITE for look ups via call_site_htab,
13941 both the initial caller containing the real return address PC and
13942 the final callee containing the current PC of a chain of tail
13943 calls do not need to have the tail call list complete. But any
13944 function candidate for a virtual tail call frame searched via
13945 TYPE_TAIL_CALL_LIST must have the tail call list complete to be
13946 determined unambiguously. */
13950 struct type *func_type = NULL;
13953 func_type = get_die_type (func_die, cu);
13954 if (func_type != NULL)
13956 gdb_assert (TYPE_CODE (func_type) == TYPE_CODE_FUNC);
13958 /* Enlist this call site to the function. */
13959 call_site->tail_call_next = TYPE_TAIL_CALL_LIST (func_type);
13960 TYPE_TAIL_CALL_LIST (func_type) = call_site;
13963 complaint (&symfile_complaints,
13964 _("Cannot find function owning DW_TAG_call_site "
13965 "DIE %s [in module %s]"),
13966 sect_offset_str (die->sect_off), objfile_name (objfile));
13970 attr = dwarf2_attr (die, DW_AT_call_target, cu);
13972 attr = dwarf2_attr (die, DW_AT_GNU_call_site_target, cu);
13974 attr = dwarf2_attr (die, DW_AT_call_origin, cu);
13977 /* This was a pre-DWARF-5 GNU extension alias for DW_AT_call_origin. */
13978 attr = dwarf2_attr (die, DW_AT_abstract_origin, cu);
13980 SET_FIELD_DWARF_BLOCK (call_site->target, NULL);
13981 if (!attr || (attr_form_is_block (attr) && DW_BLOCK (attr)->size == 0))
13982 /* Keep NULL DWARF_BLOCK. */;
13983 else if (attr_form_is_block (attr))
13985 struct dwarf2_locexpr_baton *dlbaton;
13987 dlbaton = XOBNEW (&objfile->objfile_obstack, struct dwarf2_locexpr_baton);
13988 dlbaton->data = DW_BLOCK (attr)->data;
13989 dlbaton->size = DW_BLOCK (attr)->size;
13990 dlbaton->per_cu = cu->per_cu;
13992 SET_FIELD_DWARF_BLOCK (call_site->target, dlbaton);
13994 else if (attr_form_is_ref (attr))
13996 struct dwarf2_cu *target_cu = cu;
13997 struct die_info *target_die;
13999 target_die = follow_die_ref (die, attr, &target_cu);
14000 gdb_assert (target_cu->per_cu->dwarf2_per_objfile->objfile == objfile);
14001 if (die_is_declaration (target_die, target_cu))
14003 const char *target_physname;
14005 /* Prefer the mangled name; otherwise compute the demangled one. */
14006 target_physname = dw2_linkage_name (target_die, target_cu);
14007 if (target_physname == NULL)
14008 target_physname = dwarf2_physname (NULL, target_die, target_cu);
14009 if (target_physname == NULL)
14010 complaint (&symfile_complaints,
14011 _("DW_AT_call_target target DIE has invalid "
14012 "physname, for referencing DIE %s [in module %s]"),
14013 sect_offset_str (die->sect_off), objfile_name (objfile));
14015 SET_FIELD_PHYSNAME (call_site->target, target_physname);
14021 /* DW_AT_entry_pc should be preferred. */
14022 if (dwarf2_get_pc_bounds (target_die, &lowpc, NULL, target_cu, NULL)
14023 <= PC_BOUNDS_INVALID)
14024 complaint (&symfile_complaints,
14025 _("DW_AT_call_target target DIE has invalid "
14026 "low pc, for referencing DIE %s [in module %s]"),
14027 sect_offset_str (die->sect_off), objfile_name (objfile));
14030 lowpc = gdbarch_adjust_dwarf2_addr (gdbarch, lowpc + baseaddr);
14031 SET_FIELD_PHYSADDR (call_site->target, lowpc);
14036 complaint (&symfile_complaints,
14037 _("DW_TAG_call_site DW_AT_call_target is neither "
14038 "block nor reference, for DIE %s [in module %s]"),
14039 sect_offset_str (die->sect_off), objfile_name (objfile));
14041 call_site->per_cu = cu->per_cu;
14043 for (child_die = die->child;
14044 child_die && child_die->tag;
14045 child_die = sibling_die (child_die))
14047 struct call_site_parameter *parameter;
14048 struct attribute *loc, *origin;
14050 if (child_die->tag != DW_TAG_call_site_parameter
14051 && child_die->tag != DW_TAG_GNU_call_site_parameter)
14053 /* Already printed the complaint above. */
14057 gdb_assert (call_site->parameter_count < nparams);
14058 parameter = &call_site->parameter[call_site->parameter_count];
14060 /* DW_AT_location specifies the register number or DW_AT_abstract_origin
14061 specifies DW_TAG_formal_parameter. Value of the data assumed for the
14062 register is contained in DW_AT_call_value. */
14064 loc = dwarf2_attr (child_die, DW_AT_location, cu);
14065 origin = dwarf2_attr (child_die, DW_AT_call_parameter, cu);
14066 if (origin == NULL)
14068 /* This was a pre-DWARF-5 GNU extension alias
14069 for DW_AT_call_parameter. */
14070 origin = dwarf2_attr (child_die, DW_AT_abstract_origin, cu);
14072 if (loc == NULL && origin != NULL && attr_form_is_ref (origin))
14074 parameter->kind = CALL_SITE_PARAMETER_PARAM_OFFSET;
14076 sect_offset sect_off
14077 = (sect_offset) dwarf2_get_ref_die_offset (origin);
14078 if (!offset_in_cu_p (&cu->header, sect_off))
14080 /* As DW_OP_GNU_parameter_ref uses CU-relative offset this
14081 binding can be done only inside one CU. Such referenced DIE
14082 therefore cannot be even moved to DW_TAG_partial_unit. */
14083 complaint (&symfile_complaints,
14084 _("DW_AT_call_parameter offset is not in CU for "
14085 "DW_TAG_call_site child DIE %s [in module %s]"),
14086 sect_offset_str (child_die->sect_off),
14087 objfile_name (objfile));
14090 parameter->u.param_cu_off
14091 = (cu_offset) (sect_off - cu->header.sect_off);
14093 else if (loc == NULL || origin != NULL || !attr_form_is_block (loc))
14095 complaint (&symfile_complaints,
14096 _("No DW_FORM_block* DW_AT_location for "
14097 "DW_TAG_call_site child DIE %s [in module %s]"),
14098 sect_offset_str (child_die->sect_off), objfile_name (objfile));
14103 parameter->u.dwarf_reg = dwarf_block_to_dwarf_reg
14104 (DW_BLOCK (loc)->data, &DW_BLOCK (loc)->data[DW_BLOCK (loc)->size]);
14105 if (parameter->u.dwarf_reg != -1)
14106 parameter->kind = CALL_SITE_PARAMETER_DWARF_REG;
14107 else if (dwarf_block_to_sp_offset (gdbarch, DW_BLOCK (loc)->data,
14108 &DW_BLOCK (loc)->data[DW_BLOCK (loc)->size],
14109 ¶meter->u.fb_offset))
14110 parameter->kind = CALL_SITE_PARAMETER_FB_OFFSET;
14113 complaint (&symfile_complaints,
14114 _("Only single DW_OP_reg or DW_OP_fbreg is supported "
14115 "for DW_FORM_block* DW_AT_location is supported for "
14116 "DW_TAG_call_site child DIE %s "
14118 sect_offset_str (child_die->sect_off),
14119 objfile_name (objfile));
14124 attr = dwarf2_attr (child_die, DW_AT_call_value, cu);
14126 attr = dwarf2_attr (child_die, DW_AT_GNU_call_site_value, cu);
14127 if (!attr_form_is_block (attr))
14129 complaint (&symfile_complaints,
14130 _("No DW_FORM_block* DW_AT_call_value for "
14131 "DW_TAG_call_site child DIE %s [in module %s]"),
14132 sect_offset_str (child_die->sect_off),
14133 objfile_name (objfile));
14136 parameter->value = DW_BLOCK (attr)->data;
14137 parameter->value_size = DW_BLOCK (attr)->size;
14139 /* Parameters are not pre-cleared by memset above. */
14140 parameter->data_value = NULL;
14141 parameter->data_value_size = 0;
14142 call_site->parameter_count++;
14144 attr = dwarf2_attr (child_die, DW_AT_call_data_value, cu);
14146 attr = dwarf2_attr (child_die, DW_AT_GNU_call_site_data_value, cu);
14149 if (!attr_form_is_block (attr))
14150 complaint (&symfile_complaints,
14151 _("No DW_FORM_block* DW_AT_call_data_value for "
14152 "DW_TAG_call_site child DIE %s [in module %s]"),
14153 sect_offset_str (child_die->sect_off),
14154 objfile_name (objfile));
14157 parameter->data_value = DW_BLOCK (attr)->data;
14158 parameter->data_value_size = DW_BLOCK (attr)->size;
14164 /* Helper function for read_variable. If DIE represents a virtual
14165 table, then return the type of the concrete object that is
14166 associated with the virtual table. Otherwise, return NULL. */
14168 static struct type *
14169 rust_containing_type (struct die_info *die, struct dwarf2_cu *cu)
14171 struct attribute *attr = dwarf2_attr (die, DW_AT_type, cu);
14175 /* Find the type DIE. */
14176 struct die_info *type_die = NULL;
14177 struct dwarf2_cu *type_cu = cu;
14179 if (attr_form_is_ref (attr))
14180 type_die = follow_die_ref (die, attr, &type_cu);
14181 if (type_die == NULL)
14184 if (dwarf2_attr (type_die, DW_AT_containing_type, type_cu) == NULL)
14186 return die_containing_type (type_die, type_cu);
14189 /* Read a variable (DW_TAG_variable) DIE and create a new symbol. */
14192 read_variable (struct die_info *die, struct dwarf2_cu *cu)
14194 struct rust_vtable_symbol *storage = NULL;
14196 if (cu->language == language_rust)
14198 struct type *containing_type = rust_containing_type (die, cu);
14200 if (containing_type != NULL)
14202 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
14204 storage = OBSTACK_ZALLOC (&objfile->objfile_obstack,
14205 struct rust_vtable_symbol);
14206 initialize_objfile_symbol (storage);
14207 storage->concrete_type = containing_type;
14208 storage->subclass = SYMBOL_RUST_VTABLE;
14212 new_symbol (die, NULL, cu, storage);
14215 /* Call CALLBACK from DW_AT_ranges attribute value OFFSET
14216 reading .debug_rnglists.
14217 Callback's type should be:
14218 void (CORE_ADDR range_beginning, CORE_ADDR range_end)
14219 Return true if the attributes are present and valid, otherwise,
14222 template <typename Callback>
14224 dwarf2_rnglists_process (unsigned offset, struct dwarf2_cu *cu,
14225 Callback &&callback)
14227 struct dwarf2_per_objfile *dwarf2_per_objfile
14228 = cu->per_cu->dwarf2_per_objfile;
14229 struct objfile *objfile = dwarf2_per_objfile->objfile;
14230 bfd *obfd = objfile->obfd;
14231 /* Base address selection entry. */
14234 const gdb_byte *buffer;
14235 CORE_ADDR baseaddr;
14236 bool overflow = false;
14238 found_base = cu->base_known;
14239 base = cu->base_address;
14241 dwarf2_read_section (objfile, &dwarf2_per_objfile->rnglists);
14242 if (offset >= dwarf2_per_objfile->rnglists.size)
14244 complaint (&symfile_complaints,
14245 _("Offset %d out of bounds for DW_AT_ranges attribute"),
14249 buffer = dwarf2_per_objfile->rnglists.buffer + offset;
14251 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
14255 /* Initialize it due to a false compiler warning. */
14256 CORE_ADDR range_beginning = 0, range_end = 0;
14257 const gdb_byte *buf_end = (dwarf2_per_objfile->rnglists.buffer
14258 + dwarf2_per_objfile->rnglists.size);
14259 unsigned int bytes_read;
14261 if (buffer == buf_end)
14266 const auto rlet = static_cast<enum dwarf_range_list_entry>(*buffer++);
14269 case DW_RLE_end_of_list:
14271 case DW_RLE_base_address:
14272 if (buffer + cu->header.addr_size > buf_end)
14277 base = read_address (obfd, buffer, cu, &bytes_read);
14279 buffer += bytes_read;
14281 case DW_RLE_start_length:
14282 if (buffer + cu->header.addr_size > buf_end)
14287 range_beginning = read_address (obfd, buffer, cu, &bytes_read);
14288 buffer += bytes_read;
14289 range_end = (range_beginning
14290 + read_unsigned_leb128 (obfd, buffer, &bytes_read));
14291 buffer += bytes_read;
14292 if (buffer > buf_end)
14298 case DW_RLE_offset_pair:
14299 range_beginning = read_unsigned_leb128 (obfd, buffer, &bytes_read);
14300 buffer += bytes_read;
14301 if (buffer > buf_end)
14306 range_end = read_unsigned_leb128 (obfd, buffer, &bytes_read);
14307 buffer += bytes_read;
14308 if (buffer > buf_end)
14314 case DW_RLE_start_end:
14315 if (buffer + 2 * cu->header.addr_size > buf_end)
14320 range_beginning = read_address (obfd, buffer, cu, &bytes_read);
14321 buffer += bytes_read;
14322 range_end = read_address (obfd, buffer, cu, &bytes_read);
14323 buffer += bytes_read;
14326 complaint (&symfile_complaints,
14327 _("Invalid .debug_rnglists data (no base address)"));
14330 if (rlet == DW_RLE_end_of_list || overflow)
14332 if (rlet == DW_RLE_base_address)
14337 /* We have no valid base address for the ranges
14339 complaint (&symfile_complaints,
14340 _("Invalid .debug_rnglists data (no base address)"));
14344 if (range_beginning > range_end)
14346 /* Inverted range entries are invalid. */
14347 complaint (&symfile_complaints,
14348 _("Invalid .debug_rnglists data (inverted range)"));
14352 /* Empty range entries have no effect. */
14353 if (range_beginning == range_end)
14356 range_beginning += base;
14359 /* A not-uncommon case of bad debug info.
14360 Don't pollute the addrmap with bad data. */
14361 if (range_beginning + baseaddr == 0
14362 && !dwarf2_per_objfile->has_section_at_zero)
14364 complaint (&symfile_complaints,
14365 _(".debug_rnglists entry has start address of zero"
14366 " [in module %s]"), objfile_name (objfile));
14370 callback (range_beginning, range_end);
14375 complaint (&symfile_complaints,
14376 _("Offset %d is not terminated "
14377 "for DW_AT_ranges attribute"),
14385 /* Call CALLBACK from DW_AT_ranges attribute value OFFSET reading .debug_ranges.
14386 Callback's type should be:
14387 void (CORE_ADDR range_beginning, CORE_ADDR range_end)
14388 Return 1 if the attributes are present and valid, otherwise, return 0. */
14390 template <typename Callback>
14392 dwarf2_ranges_process (unsigned offset, struct dwarf2_cu *cu,
14393 Callback &&callback)
14395 struct dwarf2_per_objfile *dwarf2_per_objfile
14396 = cu->per_cu->dwarf2_per_objfile;
14397 struct objfile *objfile = dwarf2_per_objfile->objfile;
14398 struct comp_unit_head *cu_header = &cu->header;
14399 bfd *obfd = objfile->obfd;
14400 unsigned int addr_size = cu_header->addr_size;
14401 CORE_ADDR mask = ~(~(CORE_ADDR)1 << (addr_size * 8 - 1));
14402 /* Base address selection entry. */
14405 unsigned int dummy;
14406 const gdb_byte *buffer;
14407 CORE_ADDR baseaddr;
14409 if (cu_header->version >= 5)
14410 return dwarf2_rnglists_process (offset, cu, callback);
14412 found_base = cu->base_known;
14413 base = cu->base_address;
14415 dwarf2_read_section (objfile, &dwarf2_per_objfile->ranges);
14416 if (offset >= dwarf2_per_objfile->ranges.size)
14418 complaint (&symfile_complaints,
14419 _("Offset %d out of bounds for DW_AT_ranges attribute"),
14423 buffer = dwarf2_per_objfile->ranges.buffer + offset;
14425 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
14429 CORE_ADDR range_beginning, range_end;
14431 range_beginning = read_address (obfd, buffer, cu, &dummy);
14432 buffer += addr_size;
14433 range_end = read_address (obfd, buffer, cu, &dummy);
14434 buffer += addr_size;
14435 offset += 2 * addr_size;
14437 /* An end of list marker is a pair of zero addresses. */
14438 if (range_beginning == 0 && range_end == 0)
14439 /* Found the end of list entry. */
14442 /* Each base address selection entry is a pair of 2 values.
14443 The first is the largest possible address, the second is
14444 the base address. Check for a base address here. */
14445 if ((range_beginning & mask) == mask)
14447 /* If we found the largest possible address, then we already
14448 have the base address in range_end. */
14456 /* We have no valid base address for the ranges
14458 complaint (&symfile_complaints,
14459 _("Invalid .debug_ranges data (no base address)"));
14463 if (range_beginning > range_end)
14465 /* Inverted range entries are invalid. */
14466 complaint (&symfile_complaints,
14467 _("Invalid .debug_ranges data (inverted range)"));
14471 /* Empty range entries have no effect. */
14472 if (range_beginning == range_end)
14475 range_beginning += base;
14478 /* A not-uncommon case of bad debug info.
14479 Don't pollute the addrmap with bad data. */
14480 if (range_beginning + baseaddr == 0
14481 && !dwarf2_per_objfile->has_section_at_zero)
14483 complaint (&symfile_complaints,
14484 _(".debug_ranges entry has start address of zero"
14485 " [in module %s]"), objfile_name (objfile));
14489 callback (range_beginning, range_end);
14495 /* Get low and high pc attributes from DW_AT_ranges attribute value OFFSET.
14496 Return 1 if the attributes are present and valid, otherwise, return 0.
14497 If RANGES_PST is not NULL we should setup `objfile->psymtabs_addrmap'. */
14500 dwarf2_ranges_read (unsigned offset, CORE_ADDR *low_return,
14501 CORE_ADDR *high_return, struct dwarf2_cu *cu,
14502 struct partial_symtab *ranges_pst)
14504 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
14505 struct gdbarch *gdbarch = get_objfile_arch (objfile);
14506 const CORE_ADDR baseaddr = ANOFFSET (objfile->section_offsets,
14507 SECT_OFF_TEXT (objfile));
14510 CORE_ADDR high = 0;
14513 retval = dwarf2_ranges_process (offset, cu,
14514 [&] (CORE_ADDR range_beginning, CORE_ADDR range_end)
14516 if (ranges_pst != NULL)
14521 lowpc = gdbarch_adjust_dwarf2_addr (gdbarch,
14522 range_beginning + baseaddr);
14523 highpc = gdbarch_adjust_dwarf2_addr (gdbarch,
14524 range_end + baseaddr);
14525 addrmap_set_empty (objfile->psymtabs_addrmap, lowpc, highpc - 1,
14529 /* FIXME: This is recording everything as a low-high
14530 segment of consecutive addresses. We should have a
14531 data structure for discontiguous block ranges
14535 low = range_beginning;
14541 if (range_beginning < low)
14542 low = range_beginning;
14543 if (range_end > high)
14551 /* If the first entry is an end-of-list marker, the range
14552 describes an empty scope, i.e. no instructions. */
14558 *high_return = high;
14562 /* Get low and high pc attributes from a die. See enum pc_bounds_kind
14563 definition for the return value. *LOWPC and *HIGHPC are set iff
14564 neither PC_BOUNDS_NOT_PRESENT nor PC_BOUNDS_INVALID are returned. */
14566 static enum pc_bounds_kind
14567 dwarf2_get_pc_bounds (struct die_info *die, CORE_ADDR *lowpc,
14568 CORE_ADDR *highpc, struct dwarf2_cu *cu,
14569 struct partial_symtab *pst)
14571 struct dwarf2_per_objfile *dwarf2_per_objfile
14572 = cu->per_cu->dwarf2_per_objfile;
14573 struct attribute *attr;
14574 struct attribute *attr_high;
14576 CORE_ADDR high = 0;
14577 enum pc_bounds_kind ret;
14579 attr_high = dwarf2_attr (die, DW_AT_high_pc, cu);
14582 attr = dwarf2_attr (die, DW_AT_low_pc, cu);
14585 low = attr_value_as_address (attr);
14586 high = attr_value_as_address (attr_high);
14587 if (cu->header.version >= 4 && attr_form_is_constant (attr_high))
14591 /* Found high w/o low attribute. */
14592 return PC_BOUNDS_INVALID;
14594 /* Found consecutive range of addresses. */
14595 ret = PC_BOUNDS_HIGH_LOW;
14599 attr = dwarf2_attr (die, DW_AT_ranges, cu);
14602 /* DW_AT_ranges_base does not apply to DIEs from the DWO skeleton.
14603 We take advantage of the fact that DW_AT_ranges does not appear
14604 in DW_TAG_compile_unit of DWO files. */
14605 int need_ranges_base = die->tag != DW_TAG_compile_unit;
14606 unsigned int ranges_offset = (DW_UNSND (attr)
14607 + (need_ranges_base
14611 /* Value of the DW_AT_ranges attribute is the offset in the
14612 .debug_ranges section. */
14613 if (!dwarf2_ranges_read (ranges_offset, &low, &high, cu, pst))
14614 return PC_BOUNDS_INVALID;
14615 /* Found discontinuous range of addresses. */
14616 ret = PC_BOUNDS_RANGES;
14619 return PC_BOUNDS_NOT_PRESENT;
14622 /* partial_die_info::read has also the strict LOW < HIGH requirement. */
14624 return PC_BOUNDS_INVALID;
14626 /* When using the GNU linker, .gnu.linkonce. sections are used to
14627 eliminate duplicate copies of functions and vtables and such.
14628 The linker will arbitrarily choose one and discard the others.
14629 The AT_*_pc values for such functions refer to local labels in
14630 these sections. If the section from that file was discarded, the
14631 labels are not in the output, so the relocs get a value of 0.
14632 If this is a discarded function, mark the pc bounds as invalid,
14633 so that GDB will ignore it. */
14634 if (low == 0 && !dwarf2_per_objfile->has_section_at_zero)
14635 return PC_BOUNDS_INVALID;
14643 /* Assuming that DIE represents a subprogram DIE or a lexical block, get
14644 its low and high PC addresses. Do nothing if these addresses could not
14645 be determined. Otherwise, set LOWPC to the low address if it is smaller,
14646 and HIGHPC to the high address if greater than HIGHPC. */
14649 dwarf2_get_subprogram_pc_bounds (struct die_info *die,
14650 CORE_ADDR *lowpc, CORE_ADDR *highpc,
14651 struct dwarf2_cu *cu)
14653 CORE_ADDR low, high;
14654 struct die_info *child = die->child;
14656 if (dwarf2_get_pc_bounds (die, &low, &high, cu, NULL) >= PC_BOUNDS_RANGES)
14658 *lowpc = std::min (*lowpc, low);
14659 *highpc = std::max (*highpc, high);
14662 /* If the language does not allow nested subprograms (either inside
14663 subprograms or lexical blocks), we're done. */
14664 if (cu->language != language_ada)
14667 /* Check all the children of the given DIE. If it contains nested
14668 subprograms, then check their pc bounds. Likewise, we need to
14669 check lexical blocks as well, as they may also contain subprogram
14671 while (child && child->tag)
14673 if (child->tag == DW_TAG_subprogram
14674 || child->tag == DW_TAG_lexical_block)
14675 dwarf2_get_subprogram_pc_bounds (child, lowpc, highpc, cu);
14676 child = sibling_die (child);
14680 /* Get the low and high pc's represented by the scope DIE, and store
14681 them in *LOWPC and *HIGHPC. If the correct values can't be
14682 determined, set *LOWPC to -1 and *HIGHPC to 0. */
14685 get_scope_pc_bounds (struct die_info *die,
14686 CORE_ADDR *lowpc, CORE_ADDR *highpc,
14687 struct dwarf2_cu *cu)
14689 CORE_ADDR best_low = (CORE_ADDR) -1;
14690 CORE_ADDR best_high = (CORE_ADDR) 0;
14691 CORE_ADDR current_low, current_high;
14693 if (dwarf2_get_pc_bounds (die, ¤t_low, ¤t_high, cu, NULL)
14694 >= PC_BOUNDS_RANGES)
14696 best_low = current_low;
14697 best_high = current_high;
14701 struct die_info *child = die->child;
14703 while (child && child->tag)
14705 switch (child->tag) {
14706 case DW_TAG_subprogram:
14707 dwarf2_get_subprogram_pc_bounds (child, &best_low, &best_high, cu);
14709 case DW_TAG_namespace:
14710 case DW_TAG_module:
14711 /* FIXME: carlton/2004-01-16: Should we do this for
14712 DW_TAG_class_type/DW_TAG_structure_type, too? I think
14713 that current GCC's always emit the DIEs corresponding
14714 to definitions of methods of classes as children of a
14715 DW_TAG_compile_unit or DW_TAG_namespace (as opposed to
14716 the DIEs giving the declarations, which could be
14717 anywhere). But I don't see any reason why the
14718 standards says that they have to be there. */
14719 get_scope_pc_bounds (child, ¤t_low, ¤t_high, cu);
14721 if (current_low != ((CORE_ADDR) -1))
14723 best_low = std::min (best_low, current_low);
14724 best_high = std::max (best_high, current_high);
14732 child = sibling_die (child);
14737 *highpc = best_high;
14740 /* Record the address ranges for BLOCK, offset by BASEADDR, as given
14744 dwarf2_record_block_ranges (struct die_info *die, struct block *block,
14745 CORE_ADDR baseaddr, struct dwarf2_cu *cu)
14747 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
14748 struct gdbarch *gdbarch = get_objfile_arch (objfile);
14749 struct attribute *attr;
14750 struct attribute *attr_high;
14752 attr_high = dwarf2_attr (die, DW_AT_high_pc, cu);
14755 attr = dwarf2_attr (die, DW_AT_low_pc, cu);
14758 CORE_ADDR low = attr_value_as_address (attr);
14759 CORE_ADDR high = attr_value_as_address (attr_high);
14761 if (cu->header.version >= 4 && attr_form_is_constant (attr_high))
14764 low = gdbarch_adjust_dwarf2_addr (gdbarch, low + baseaddr);
14765 high = gdbarch_adjust_dwarf2_addr (gdbarch, high + baseaddr);
14766 record_block_range (block, low, high - 1);
14770 attr = dwarf2_attr (die, DW_AT_ranges, cu);
14773 /* DW_AT_ranges_base does not apply to DIEs from the DWO skeleton.
14774 We take advantage of the fact that DW_AT_ranges does not appear
14775 in DW_TAG_compile_unit of DWO files. */
14776 int need_ranges_base = die->tag != DW_TAG_compile_unit;
14778 /* The value of the DW_AT_ranges attribute is the offset of the
14779 address range list in the .debug_ranges section. */
14780 unsigned long offset = (DW_UNSND (attr)
14781 + (need_ranges_base ? cu->ranges_base : 0));
14783 dwarf2_ranges_process (offset, cu,
14784 [&] (CORE_ADDR start, CORE_ADDR end)
14788 start = gdbarch_adjust_dwarf2_addr (gdbarch, start);
14789 end = gdbarch_adjust_dwarf2_addr (gdbarch, end);
14790 record_block_range (block, start, end - 1);
14795 /* Check whether the producer field indicates either of GCC < 4.6, or the
14796 Intel C/C++ compiler, and cache the result in CU. */
14799 check_producer (struct dwarf2_cu *cu)
14803 if (cu->producer == NULL)
14805 /* For unknown compilers expect their behavior is DWARF version
14808 GCC started to support .debug_types sections by -gdwarf-4 since
14809 gcc-4.5.x. As the .debug_types sections are missing DW_AT_producer
14810 for their space efficiency GDB cannot workaround gcc-4.5.x -gdwarf-4
14811 combination. gcc-4.5.x -gdwarf-4 binaries have DW_AT_accessibility
14812 interpreted incorrectly by GDB now - GCC PR debug/48229. */
14814 else if (producer_is_gcc (cu->producer, &major, &minor))
14816 cu->producer_is_gxx_lt_4_6 = major < 4 || (major == 4 && minor < 6);
14817 cu->producer_is_gcc_lt_4_3 = major < 4 || (major == 4 && minor < 3);
14819 else if (producer_is_icc (cu->producer, &major, &minor))
14820 cu->producer_is_icc_lt_14 = major < 14;
14823 /* For other non-GCC compilers, expect their behavior is DWARF version
14827 cu->checked_producer = 1;
14830 /* Check for GCC PR debug/45124 fix which is not present in any G++ version up
14831 to 4.5.any while it is present already in G++ 4.6.0 - the PR has been fixed
14832 during 4.6.0 experimental. */
14835 producer_is_gxx_lt_4_6 (struct dwarf2_cu *cu)
14837 if (!cu->checked_producer)
14838 check_producer (cu);
14840 return cu->producer_is_gxx_lt_4_6;
14843 /* Return the default accessibility type if it is not overriden by
14844 DW_AT_accessibility. */
14846 static enum dwarf_access_attribute
14847 dwarf2_default_access_attribute (struct die_info *die, struct dwarf2_cu *cu)
14849 if (cu->header.version < 3 || producer_is_gxx_lt_4_6 (cu))
14851 /* The default DWARF 2 accessibility for members is public, the default
14852 accessibility for inheritance is private. */
14854 if (die->tag != DW_TAG_inheritance)
14855 return DW_ACCESS_public;
14857 return DW_ACCESS_private;
14861 /* DWARF 3+ defines the default accessibility a different way. The same
14862 rules apply now for DW_TAG_inheritance as for the members and it only
14863 depends on the container kind. */
14865 if (die->parent->tag == DW_TAG_class_type)
14866 return DW_ACCESS_private;
14868 return DW_ACCESS_public;
14872 /* Look for DW_AT_data_member_location. Set *OFFSET to the byte
14873 offset. If the attribute was not found return 0, otherwise return
14874 1. If it was found but could not properly be handled, set *OFFSET
14878 handle_data_member_location (struct die_info *die, struct dwarf2_cu *cu,
14881 struct attribute *attr;
14883 attr = dwarf2_attr (die, DW_AT_data_member_location, cu);
14888 /* Note that we do not check for a section offset first here.
14889 This is because DW_AT_data_member_location is new in DWARF 4,
14890 so if we see it, we can assume that a constant form is really
14891 a constant and not a section offset. */
14892 if (attr_form_is_constant (attr))
14893 *offset = dwarf2_get_attr_constant_value (attr, 0);
14894 else if (attr_form_is_section_offset (attr))
14895 dwarf2_complex_location_expr_complaint ();
14896 else if (attr_form_is_block (attr))
14897 *offset = decode_locdesc (DW_BLOCK (attr), cu);
14899 dwarf2_complex_location_expr_complaint ();
14907 /* Add an aggregate field to the field list. */
14910 dwarf2_add_field (struct field_info *fip, struct die_info *die,
14911 struct dwarf2_cu *cu)
14913 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
14914 struct gdbarch *gdbarch = get_objfile_arch (objfile);
14915 struct nextfield *new_field;
14916 struct attribute *attr;
14918 const char *fieldname = "";
14920 if (die->tag == DW_TAG_inheritance)
14922 fip->baseclasses.emplace_back ();
14923 new_field = &fip->baseclasses.back ();
14927 fip->fields.emplace_back ();
14928 new_field = &fip->fields.back ();
14933 attr = dwarf2_attr (die, DW_AT_accessibility, cu);
14935 new_field->accessibility = DW_UNSND (attr);
14937 new_field->accessibility = dwarf2_default_access_attribute (die, cu);
14938 if (new_field->accessibility != DW_ACCESS_public)
14939 fip->non_public_fields = 1;
14941 attr = dwarf2_attr (die, DW_AT_virtuality, cu);
14943 new_field->virtuality = DW_UNSND (attr);
14945 new_field->virtuality = DW_VIRTUALITY_none;
14947 fp = &new_field->field;
14949 if (die->tag == DW_TAG_member && ! die_is_declaration (die, cu))
14953 /* Data member other than a C++ static data member. */
14955 /* Get type of field. */
14956 fp->type = die_type (die, cu);
14958 SET_FIELD_BITPOS (*fp, 0);
14960 /* Get bit size of field (zero if none). */
14961 attr = dwarf2_attr (die, DW_AT_bit_size, cu);
14964 FIELD_BITSIZE (*fp) = DW_UNSND (attr);
14968 FIELD_BITSIZE (*fp) = 0;
14971 /* Get bit offset of field. */
14972 if (handle_data_member_location (die, cu, &offset))
14973 SET_FIELD_BITPOS (*fp, offset * bits_per_byte);
14974 attr = dwarf2_attr (die, DW_AT_bit_offset, cu);
14977 if (gdbarch_bits_big_endian (gdbarch))
14979 /* For big endian bits, the DW_AT_bit_offset gives the
14980 additional bit offset from the MSB of the containing
14981 anonymous object to the MSB of the field. We don't
14982 have to do anything special since we don't need to
14983 know the size of the anonymous object. */
14984 SET_FIELD_BITPOS (*fp, FIELD_BITPOS (*fp) + DW_UNSND (attr));
14988 /* For little endian bits, compute the bit offset to the
14989 MSB of the anonymous object, subtract off the number of
14990 bits from the MSB of the field to the MSB of the
14991 object, and then subtract off the number of bits of
14992 the field itself. The result is the bit offset of
14993 the LSB of the field. */
14994 int anonymous_size;
14995 int bit_offset = DW_UNSND (attr);
14997 attr = dwarf2_attr (die, DW_AT_byte_size, cu);
15000 /* The size of the anonymous object containing
15001 the bit field is explicit, so use the
15002 indicated size (in bytes). */
15003 anonymous_size = DW_UNSND (attr);
15007 /* The size of the anonymous object containing
15008 the bit field must be inferred from the type
15009 attribute of the data member containing the
15011 anonymous_size = TYPE_LENGTH (fp->type);
15013 SET_FIELD_BITPOS (*fp,
15014 (FIELD_BITPOS (*fp)
15015 + anonymous_size * bits_per_byte
15016 - bit_offset - FIELD_BITSIZE (*fp)));
15019 attr = dwarf2_attr (die, DW_AT_data_bit_offset, cu);
15021 SET_FIELD_BITPOS (*fp, (FIELD_BITPOS (*fp)
15022 + dwarf2_get_attr_constant_value (attr, 0)));
15024 /* Get name of field. */
15025 fieldname = dwarf2_name (die, cu);
15026 if (fieldname == NULL)
15029 /* The name is already allocated along with this objfile, so we don't
15030 need to duplicate it for the type. */
15031 fp->name = fieldname;
15033 /* Change accessibility for artificial fields (e.g. virtual table
15034 pointer or virtual base class pointer) to private. */
15035 if (dwarf2_attr (die, DW_AT_artificial, cu))
15037 FIELD_ARTIFICIAL (*fp) = 1;
15038 new_field->accessibility = DW_ACCESS_private;
15039 fip->non_public_fields = 1;
15042 else if (die->tag == DW_TAG_member || die->tag == DW_TAG_variable)
15044 /* C++ static member. */
15046 /* NOTE: carlton/2002-11-05: It should be a DW_TAG_member that
15047 is a declaration, but all versions of G++ as of this writing
15048 (so through at least 3.2.1) incorrectly generate
15049 DW_TAG_variable tags. */
15051 const char *physname;
15053 /* Get name of field. */
15054 fieldname = dwarf2_name (die, cu);
15055 if (fieldname == NULL)
15058 attr = dwarf2_attr (die, DW_AT_const_value, cu);
15060 /* Only create a symbol if this is an external value.
15061 new_symbol checks this and puts the value in the global symbol
15062 table, which we want. If it is not external, new_symbol
15063 will try to put the value in cu->list_in_scope which is wrong. */
15064 && dwarf2_flag_true_p (die, DW_AT_external, cu))
15066 /* A static const member, not much different than an enum as far as
15067 we're concerned, except that we can support more types. */
15068 new_symbol (die, NULL, cu);
15071 /* Get physical name. */
15072 physname = dwarf2_physname (fieldname, die, cu);
15074 /* The name is already allocated along with this objfile, so we don't
15075 need to duplicate it for the type. */
15076 SET_FIELD_PHYSNAME (*fp, physname ? physname : "");
15077 FIELD_TYPE (*fp) = die_type (die, cu);
15078 FIELD_NAME (*fp) = fieldname;
15080 else if (die->tag == DW_TAG_inheritance)
15084 /* C++ base class field. */
15085 if (handle_data_member_location (die, cu, &offset))
15086 SET_FIELD_BITPOS (*fp, offset * bits_per_byte);
15087 FIELD_BITSIZE (*fp) = 0;
15088 FIELD_TYPE (*fp) = die_type (die, cu);
15089 FIELD_NAME (*fp) = type_name_no_tag (fp->type);
15091 else if (die->tag == DW_TAG_variant_part)
15093 /* process_structure_scope will treat this DIE as a union. */
15094 process_structure_scope (die, cu);
15096 /* The variant part is relative to the start of the enclosing
15098 SET_FIELD_BITPOS (*fp, 0);
15099 fp->type = get_die_type (die, cu);
15100 fp->artificial = 1;
15101 fp->name = "<<variant>>";
15104 gdb_assert_not_reached ("missing case in dwarf2_add_field");
15107 /* Can the type given by DIE define another type? */
15110 type_can_define_types (const struct die_info *die)
15114 case DW_TAG_typedef:
15115 case DW_TAG_class_type:
15116 case DW_TAG_structure_type:
15117 case DW_TAG_union_type:
15118 case DW_TAG_enumeration_type:
15126 /* Add a type definition defined in the scope of the FIP's class. */
15129 dwarf2_add_type_defn (struct field_info *fip, struct die_info *die,
15130 struct dwarf2_cu *cu)
15132 struct decl_field fp;
15133 memset (&fp, 0, sizeof (fp));
15135 gdb_assert (type_can_define_types (die));
15137 /* Get name of field. NULL is okay here, meaning an anonymous type. */
15138 fp.name = dwarf2_name (die, cu);
15139 fp.type = read_type_die (die, cu);
15141 /* Save accessibility. */
15142 enum dwarf_access_attribute accessibility;
15143 struct attribute *attr = dwarf2_attr (die, DW_AT_accessibility, cu);
15145 accessibility = (enum dwarf_access_attribute) DW_UNSND (attr);
15147 accessibility = dwarf2_default_access_attribute (die, cu);
15148 switch (accessibility)
15150 case DW_ACCESS_public:
15151 /* The assumed value if neither private nor protected. */
15153 case DW_ACCESS_private:
15156 case DW_ACCESS_protected:
15157 fp.is_protected = 1;
15160 complaint (&symfile_complaints,
15161 _("Unhandled DW_AT_accessibility value (%x)"), accessibility);
15164 if (die->tag == DW_TAG_typedef)
15165 fip->typedef_field_list.push_back (fp);
15167 fip->nested_types_list.push_back (fp);
15170 /* Create the vector of fields, and attach it to the type. */
15173 dwarf2_attach_fields_to_type (struct field_info *fip, struct type *type,
15174 struct dwarf2_cu *cu)
15176 int nfields = fip->nfields;
15178 /* Record the field count, allocate space for the array of fields,
15179 and create blank accessibility bitfields if necessary. */
15180 TYPE_NFIELDS (type) = nfields;
15181 TYPE_FIELDS (type) = (struct field *)
15182 TYPE_ZALLOC (type, sizeof (struct field) * nfields);
15184 if (fip->non_public_fields && cu->language != language_ada)
15186 ALLOCATE_CPLUS_STRUCT_TYPE (type);
15188 TYPE_FIELD_PRIVATE_BITS (type) =
15189 (B_TYPE *) TYPE_ALLOC (type, B_BYTES (nfields));
15190 B_CLRALL (TYPE_FIELD_PRIVATE_BITS (type), nfields);
15192 TYPE_FIELD_PROTECTED_BITS (type) =
15193 (B_TYPE *) TYPE_ALLOC (type, B_BYTES (nfields));
15194 B_CLRALL (TYPE_FIELD_PROTECTED_BITS (type), nfields);
15196 TYPE_FIELD_IGNORE_BITS (type) =
15197 (B_TYPE *) TYPE_ALLOC (type, B_BYTES (nfields));
15198 B_CLRALL (TYPE_FIELD_IGNORE_BITS (type), nfields);
15201 /* If the type has baseclasses, allocate and clear a bit vector for
15202 TYPE_FIELD_VIRTUAL_BITS. */
15203 if (!fip->baseclasses.empty () && cu->language != language_ada)
15205 int num_bytes = B_BYTES (fip->baseclasses.size ());
15206 unsigned char *pointer;
15208 ALLOCATE_CPLUS_STRUCT_TYPE (type);
15209 pointer = (unsigned char *) TYPE_ALLOC (type, num_bytes);
15210 TYPE_FIELD_VIRTUAL_BITS (type) = pointer;
15211 B_CLRALL (TYPE_FIELD_VIRTUAL_BITS (type), fip->baseclasses.size ());
15212 TYPE_N_BASECLASSES (type) = fip->baseclasses.size ();
15215 if (TYPE_FLAG_DISCRIMINATED_UNION (type))
15217 struct discriminant_info *di = alloc_discriminant_info (type, -1, -1);
15219 for (int index = 0; index < nfields; ++index)
15221 struct nextfield &field = fip->fields[index];
15223 if (field.variant.is_discriminant)
15224 di->discriminant_index = index;
15225 else if (field.variant.default_branch)
15226 di->default_index = index;
15228 di->discriminants[index] = field.variant.discriminant_value;
15232 /* Copy the saved-up fields into the field vector. */
15233 for (int i = 0; i < nfields; ++i)
15235 struct nextfield &field
15236 = ((i < fip->baseclasses.size ()) ? fip->baseclasses[i]
15237 : fip->fields[i - fip->baseclasses.size ()]);
15239 TYPE_FIELD (type, i) = field.field;
15240 switch (field.accessibility)
15242 case DW_ACCESS_private:
15243 if (cu->language != language_ada)
15244 SET_TYPE_FIELD_PRIVATE (type, i);
15247 case DW_ACCESS_protected:
15248 if (cu->language != language_ada)
15249 SET_TYPE_FIELD_PROTECTED (type, i);
15252 case DW_ACCESS_public:
15256 /* Unknown accessibility. Complain and treat it as public. */
15258 complaint (&symfile_complaints, _("unsupported accessibility %d"),
15259 field.accessibility);
15263 if (i < fip->baseclasses.size ())
15265 switch (field.virtuality)
15267 case DW_VIRTUALITY_virtual:
15268 case DW_VIRTUALITY_pure_virtual:
15269 if (cu->language == language_ada)
15270 error (_("unexpected virtuality in component of Ada type"));
15271 SET_TYPE_FIELD_VIRTUAL (type, i);
15278 /* Return true if this member function is a constructor, false
15282 dwarf2_is_constructor (struct die_info *die, struct dwarf2_cu *cu)
15284 const char *fieldname;
15285 const char *type_name;
15288 if (die->parent == NULL)
15291 if (die->parent->tag != DW_TAG_structure_type
15292 && die->parent->tag != DW_TAG_union_type
15293 && die->parent->tag != DW_TAG_class_type)
15296 fieldname = dwarf2_name (die, cu);
15297 type_name = dwarf2_name (die->parent, cu);
15298 if (fieldname == NULL || type_name == NULL)
15301 len = strlen (fieldname);
15302 return (strncmp (fieldname, type_name, len) == 0
15303 && (type_name[len] == '\0' || type_name[len] == '<'));
15306 /* Add a member function to the proper fieldlist. */
15309 dwarf2_add_member_fn (struct field_info *fip, struct die_info *die,
15310 struct type *type, struct dwarf2_cu *cu)
15312 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
15313 struct attribute *attr;
15315 struct fnfieldlist *flp = nullptr;
15316 struct fn_field *fnp;
15317 const char *fieldname;
15318 struct type *this_type;
15319 enum dwarf_access_attribute accessibility;
15321 if (cu->language == language_ada)
15322 error (_("unexpected member function in Ada type"));
15324 /* Get name of member function. */
15325 fieldname = dwarf2_name (die, cu);
15326 if (fieldname == NULL)
15329 /* Look up member function name in fieldlist. */
15330 for (i = 0; i < fip->fnfieldlists.size (); i++)
15332 if (strcmp (fip->fnfieldlists[i].name, fieldname) == 0)
15334 flp = &fip->fnfieldlists[i];
15339 /* Create a new fnfieldlist if necessary. */
15340 if (flp == nullptr)
15342 fip->fnfieldlists.emplace_back ();
15343 flp = &fip->fnfieldlists.back ();
15344 flp->name = fieldname;
15345 i = fip->fnfieldlists.size () - 1;
15348 /* Create a new member function field and add it to the vector of
15350 flp->fnfields.emplace_back ();
15351 fnp = &flp->fnfields.back ();
15353 /* Delay processing of the physname until later. */
15354 if (cu->language == language_cplus)
15355 add_to_method_list (type, i, flp->fnfields.size () - 1, fieldname,
15359 const char *physname = dwarf2_physname (fieldname, die, cu);
15360 fnp->physname = physname ? physname : "";
15363 fnp->type = alloc_type (objfile);
15364 this_type = read_type_die (die, cu);
15365 if (this_type && TYPE_CODE (this_type) == TYPE_CODE_FUNC)
15367 int nparams = TYPE_NFIELDS (this_type);
15369 /* TYPE is the domain of this method, and THIS_TYPE is the type
15370 of the method itself (TYPE_CODE_METHOD). */
15371 smash_to_method_type (fnp->type, type,
15372 TYPE_TARGET_TYPE (this_type),
15373 TYPE_FIELDS (this_type),
15374 TYPE_NFIELDS (this_type),
15375 TYPE_VARARGS (this_type));
15377 /* Handle static member functions.
15378 Dwarf2 has no clean way to discern C++ static and non-static
15379 member functions. G++ helps GDB by marking the first
15380 parameter for non-static member functions (which is the this
15381 pointer) as artificial. We obtain this information from
15382 read_subroutine_type via TYPE_FIELD_ARTIFICIAL. */
15383 if (nparams == 0 || TYPE_FIELD_ARTIFICIAL (this_type, 0) == 0)
15384 fnp->voffset = VOFFSET_STATIC;
15387 complaint (&symfile_complaints, _("member function type missing for '%s'"),
15388 dwarf2_full_name (fieldname, die, cu));
15390 /* Get fcontext from DW_AT_containing_type if present. */
15391 if (dwarf2_attr (die, DW_AT_containing_type, cu) != NULL)
15392 fnp->fcontext = die_containing_type (die, cu);
15394 /* dwarf2 doesn't have stubbed physical names, so the setting of is_const and
15395 is_volatile is irrelevant, as it is needed by gdb_mangle_name only. */
15397 /* Get accessibility. */
15398 attr = dwarf2_attr (die, DW_AT_accessibility, cu);
15400 accessibility = (enum dwarf_access_attribute) DW_UNSND (attr);
15402 accessibility = dwarf2_default_access_attribute (die, cu);
15403 switch (accessibility)
15405 case DW_ACCESS_private:
15406 fnp->is_private = 1;
15408 case DW_ACCESS_protected:
15409 fnp->is_protected = 1;
15413 /* Check for artificial methods. */
15414 attr = dwarf2_attr (die, DW_AT_artificial, cu);
15415 if (attr && DW_UNSND (attr) != 0)
15416 fnp->is_artificial = 1;
15418 fnp->is_constructor = dwarf2_is_constructor (die, cu);
15420 /* Get index in virtual function table if it is a virtual member
15421 function. For older versions of GCC, this is an offset in the
15422 appropriate virtual table, as specified by DW_AT_containing_type.
15423 For everyone else, it is an expression to be evaluated relative
15424 to the object address. */
15426 attr = dwarf2_attr (die, DW_AT_vtable_elem_location, cu);
15429 if (attr_form_is_block (attr) && DW_BLOCK (attr)->size > 0)
15431 if (DW_BLOCK (attr)->data[0] == DW_OP_constu)
15433 /* Old-style GCC. */
15434 fnp->voffset = decode_locdesc (DW_BLOCK (attr), cu) + 2;
15436 else if (DW_BLOCK (attr)->data[0] == DW_OP_deref
15437 || (DW_BLOCK (attr)->size > 1
15438 && DW_BLOCK (attr)->data[0] == DW_OP_deref_size
15439 && DW_BLOCK (attr)->data[1] == cu->header.addr_size))
15441 fnp->voffset = decode_locdesc (DW_BLOCK (attr), cu);
15442 if ((fnp->voffset % cu->header.addr_size) != 0)
15443 dwarf2_complex_location_expr_complaint ();
15445 fnp->voffset /= cu->header.addr_size;
15449 dwarf2_complex_location_expr_complaint ();
15451 if (!fnp->fcontext)
15453 /* If there is no `this' field and no DW_AT_containing_type,
15454 we cannot actually find a base class context for the
15456 if (TYPE_NFIELDS (this_type) == 0
15457 || !TYPE_FIELD_ARTIFICIAL (this_type, 0))
15459 complaint (&symfile_complaints,
15460 _("cannot determine context for virtual member "
15461 "function \"%s\" (offset %s)"),
15462 fieldname, sect_offset_str (die->sect_off));
15467 = TYPE_TARGET_TYPE (TYPE_FIELD_TYPE (this_type, 0));
15471 else if (attr_form_is_section_offset (attr))
15473 dwarf2_complex_location_expr_complaint ();
15477 dwarf2_invalid_attrib_class_complaint ("DW_AT_vtable_elem_location",
15483 attr = dwarf2_attr (die, DW_AT_virtuality, cu);
15484 if (attr && DW_UNSND (attr))
15486 /* GCC does this, as of 2008-08-25; PR debug/37237. */
15487 complaint (&symfile_complaints,
15488 _("Member function \"%s\" (offset %s) is virtual "
15489 "but the vtable offset is not specified"),
15490 fieldname, sect_offset_str (die->sect_off));
15491 ALLOCATE_CPLUS_STRUCT_TYPE (type);
15492 TYPE_CPLUS_DYNAMIC (type) = 1;
15497 /* Create the vector of member function fields, and attach it to the type. */
15500 dwarf2_attach_fn_fields_to_type (struct field_info *fip, struct type *type,
15501 struct dwarf2_cu *cu)
15503 if (cu->language == language_ada)
15504 error (_("unexpected member functions in Ada type"));
15506 ALLOCATE_CPLUS_STRUCT_TYPE (type);
15507 TYPE_FN_FIELDLISTS (type) = (struct fn_fieldlist *)
15509 sizeof (struct fn_fieldlist) * fip->fnfieldlists.size ());
15511 for (int i = 0; i < fip->fnfieldlists.size (); i++)
15513 struct fnfieldlist &nf = fip->fnfieldlists[i];
15514 struct fn_fieldlist *fn_flp = &TYPE_FN_FIELDLIST (type, i);
15516 TYPE_FN_FIELDLIST_NAME (type, i) = nf.name;
15517 TYPE_FN_FIELDLIST_LENGTH (type, i) = nf.fnfields.size ();
15518 fn_flp->fn_fields = (struct fn_field *)
15519 TYPE_ALLOC (type, sizeof (struct fn_field) * nf.fnfields.size ());
15521 for (int k = 0; k < nf.fnfields.size (); ++k)
15522 fn_flp->fn_fields[k] = nf.fnfields[k];
15525 TYPE_NFN_FIELDS (type) = fip->fnfieldlists.size ();
15528 /* Returns non-zero if NAME is the name of a vtable member in CU's
15529 language, zero otherwise. */
15531 is_vtable_name (const char *name, struct dwarf2_cu *cu)
15533 static const char vptr[] = "_vptr";
15535 /* Look for the C++ form of the vtable. */
15536 if (startswith (name, vptr) && is_cplus_marker (name[sizeof (vptr) - 1]))
15542 /* GCC outputs unnamed structures that are really pointers to member
15543 functions, with the ABI-specified layout. If TYPE describes
15544 such a structure, smash it into a member function type.
15546 GCC shouldn't do this; it should just output pointer to member DIEs.
15547 This is GCC PR debug/28767. */
15550 quirk_gcc_member_function_pointer (struct type *type, struct objfile *objfile)
15552 struct type *pfn_type, *self_type, *new_type;
15554 /* Check for a structure with no name and two children. */
15555 if (TYPE_CODE (type) != TYPE_CODE_STRUCT || TYPE_NFIELDS (type) != 2)
15558 /* Check for __pfn and __delta members. */
15559 if (TYPE_FIELD_NAME (type, 0) == NULL
15560 || strcmp (TYPE_FIELD_NAME (type, 0), "__pfn") != 0
15561 || TYPE_FIELD_NAME (type, 1) == NULL
15562 || strcmp (TYPE_FIELD_NAME (type, 1), "__delta") != 0)
15565 /* Find the type of the method. */
15566 pfn_type = TYPE_FIELD_TYPE (type, 0);
15567 if (pfn_type == NULL
15568 || TYPE_CODE (pfn_type) != TYPE_CODE_PTR
15569 || TYPE_CODE (TYPE_TARGET_TYPE (pfn_type)) != TYPE_CODE_FUNC)
15572 /* Look for the "this" argument. */
15573 pfn_type = TYPE_TARGET_TYPE (pfn_type);
15574 if (TYPE_NFIELDS (pfn_type) == 0
15575 /* || TYPE_FIELD_TYPE (pfn_type, 0) == NULL */
15576 || TYPE_CODE (TYPE_FIELD_TYPE (pfn_type, 0)) != TYPE_CODE_PTR)
15579 self_type = TYPE_TARGET_TYPE (TYPE_FIELD_TYPE (pfn_type, 0));
15580 new_type = alloc_type (objfile);
15581 smash_to_method_type (new_type, self_type, TYPE_TARGET_TYPE (pfn_type),
15582 TYPE_FIELDS (pfn_type), TYPE_NFIELDS (pfn_type),
15583 TYPE_VARARGS (pfn_type));
15584 smash_to_methodptr_type (type, new_type);
15587 /* If the DIE has a DW_AT_alignment attribute, return its value, doing
15588 appropriate error checking and issuing complaints if there is a
15592 get_alignment (struct dwarf2_cu *cu, struct die_info *die)
15594 struct attribute *attr = dwarf2_attr (die, DW_AT_alignment, cu);
15596 if (attr == nullptr)
15599 if (!attr_form_is_constant (attr))
15601 complaint (&symfile_complaints,
15602 _("DW_AT_alignment must have constant form"
15603 " - DIE at %s [in module %s]"),
15604 sect_offset_str (die->sect_off),
15605 objfile_name (cu->per_cu->dwarf2_per_objfile->objfile));
15610 if (attr->form == DW_FORM_sdata)
15612 LONGEST val = DW_SND (attr);
15615 complaint (&symfile_complaints,
15616 _("DW_AT_alignment value must not be negative"
15617 " - DIE at %s [in module %s]"),
15618 sect_offset_str (die->sect_off),
15619 objfile_name (cu->per_cu->dwarf2_per_objfile->objfile));
15625 align = DW_UNSND (attr);
15629 complaint (&symfile_complaints,
15630 _("DW_AT_alignment value must not be zero"
15631 " - DIE at %s [in module %s]"),
15632 sect_offset_str (die->sect_off),
15633 objfile_name (cu->per_cu->dwarf2_per_objfile->objfile));
15636 if ((align & (align - 1)) != 0)
15638 complaint (&symfile_complaints,
15639 _("DW_AT_alignment value must be a power of 2"
15640 " - DIE at %s [in module %s]"),
15641 sect_offset_str (die->sect_off),
15642 objfile_name (cu->per_cu->dwarf2_per_objfile->objfile));
15649 /* If the DIE has a DW_AT_alignment attribute, use its value to set
15650 the alignment for TYPE. */
15653 maybe_set_alignment (struct dwarf2_cu *cu, struct die_info *die,
15656 if (!set_type_align (type, get_alignment (cu, die)))
15657 complaint (&symfile_complaints,
15658 _("DW_AT_alignment value too large"
15659 " - DIE at %s [in module %s]"),
15660 sect_offset_str (die->sect_off),
15661 objfile_name (cu->per_cu->dwarf2_per_objfile->objfile));
15664 /* Called when we find the DIE that starts a structure or union scope
15665 (definition) to create a type for the structure or union. Fill in
15666 the type's name and general properties; the members will not be
15667 processed until process_structure_scope. A symbol table entry for
15668 the type will also not be done until process_structure_scope (assuming
15669 the type has a name).
15671 NOTE: we need to call these functions regardless of whether or not the
15672 DIE has a DW_AT_name attribute, since it might be an anonymous
15673 structure or union. This gets the type entered into our set of
15674 user defined types. */
15676 static struct type *
15677 read_structure_type (struct die_info *die, struct dwarf2_cu *cu)
15679 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
15681 struct attribute *attr;
15684 /* If the definition of this type lives in .debug_types, read that type.
15685 Don't follow DW_AT_specification though, that will take us back up
15686 the chain and we want to go down. */
15687 attr = dwarf2_attr_no_follow (die, DW_AT_signature);
15690 type = get_DW_AT_signature_type (die, attr, cu);
15692 /* The type's CU may not be the same as CU.
15693 Ensure TYPE is recorded with CU in die_type_hash. */
15694 return set_die_type (die, type, cu);
15697 type = alloc_type (objfile);
15698 INIT_CPLUS_SPECIFIC (type);
15700 name = dwarf2_name (die, cu);
15703 if (cu->language == language_cplus
15704 || cu->language == language_d
15705 || cu->language == language_rust)
15707 const char *full_name = dwarf2_full_name (name, die, cu);
15709 /* dwarf2_full_name might have already finished building the DIE's
15710 type. If so, there is no need to continue. */
15711 if (get_die_type (die, cu) != NULL)
15712 return get_die_type (die, cu);
15714 TYPE_TAG_NAME (type) = full_name;
15715 if (die->tag == DW_TAG_structure_type
15716 || die->tag == DW_TAG_class_type)
15717 TYPE_NAME (type) = TYPE_TAG_NAME (type);
15721 /* The name is already allocated along with this objfile, so
15722 we don't need to duplicate it for the type. */
15723 TYPE_TAG_NAME (type) = name;
15724 if (die->tag == DW_TAG_class_type)
15725 TYPE_NAME (type) = TYPE_TAG_NAME (type);
15729 if (die->tag == DW_TAG_structure_type)
15731 TYPE_CODE (type) = TYPE_CODE_STRUCT;
15733 else if (die->tag == DW_TAG_union_type)
15735 TYPE_CODE (type) = TYPE_CODE_UNION;
15737 else if (die->tag == DW_TAG_variant_part)
15739 TYPE_CODE (type) = TYPE_CODE_UNION;
15740 TYPE_FLAG_DISCRIMINATED_UNION (type) = 1;
15744 TYPE_CODE (type) = TYPE_CODE_STRUCT;
15747 if (cu->language == language_cplus && die->tag == DW_TAG_class_type)
15748 TYPE_DECLARED_CLASS (type) = 1;
15750 attr = dwarf2_attr (die, DW_AT_byte_size, cu);
15753 if (attr_form_is_constant (attr))
15754 TYPE_LENGTH (type) = DW_UNSND (attr);
15757 /* For the moment, dynamic type sizes are not supported
15758 by GDB's struct type. The actual size is determined
15759 on-demand when resolving the type of a given object,
15760 so set the type's length to zero for now. Otherwise,
15761 we record an expression as the length, and that expression
15762 could lead to a very large value, which could eventually
15763 lead to us trying to allocate that much memory when creating
15764 a value of that type. */
15765 TYPE_LENGTH (type) = 0;
15770 TYPE_LENGTH (type) = 0;
15773 maybe_set_alignment (cu, die, type);
15775 if (producer_is_icc_lt_14 (cu) && (TYPE_LENGTH (type) == 0))
15777 /* ICC<14 does not output the required DW_AT_declaration on
15778 incomplete types, but gives them a size of zero. */
15779 TYPE_STUB (type) = 1;
15782 TYPE_STUB_SUPPORTED (type) = 1;
15784 if (die_is_declaration (die, cu))
15785 TYPE_STUB (type) = 1;
15786 else if (attr == NULL && die->child == NULL
15787 && producer_is_realview (cu->producer))
15788 /* RealView does not output the required DW_AT_declaration
15789 on incomplete types. */
15790 TYPE_STUB (type) = 1;
15792 /* We need to add the type field to the die immediately so we don't
15793 infinitely recurse when dealing with pointers to the structure
15794 type within the structure itself. */
15795 set_die_type (die, type, cu);
15797 /* set_die_type should be already done. */
15798 set_descriptive_type (type, die, cu);
15803 /* A helper for process_structure_scope that handles a single member
15807 handle_struct_member_die (struct die_info *child_die, struct type *type,
15808 struct field_info *fi,
15809 std::vector<struct symbol *> *template_args,
15810 struct dwarf2_cu *cu)
15812 if (child_die->tag == DW_TAG_member
15813 || child_die->tag == DW_TAG_variable
15814 || child_die->tag == DW_TAG_variant_part)
15816 /* NOTE: carlton/2002-11-05: A C++ static data member
15817 should be a DW_TAG_member that is a declaration, but
15818 all versions of G++ as of this writing (so through at
15819 least 3.2.1) incorrectly generate DW_TAG_variable
15820 tags for them instead. */
15821 dwarf2_add_field (fi, child_die, cu);
15823 else if (child_die->tag == DW_TAG_subprogram)
15825 /* Rust doesn't have member functions in the C++ sense.
15826 However, it does emit ordinary functions as children
15827 of a struct DIE. */
15828 if (cu->language == language_rust)
15829 read_func_scope (child_die, cu);
15832 /* C++ member function. */
15833 dwarf2_add_member_fn (fi, child_die, type, cu);
15836 else if (child_die->tag == DW_TAG_inheritance)
15838 /* C++ base class field. */
15839 dwarf2_add_field (fi, child_die, cu);
15841 else if (type_can_define_types (child_die))
15842 dwarf2_add_type_defn (fi, child_die, cu);
15843 else if (child_die->tag == DW_TAG_template_type_param
15844 || child_die->tag == DW_TAG_template_value_param)
15846 struct symbol *arg = new_symbol (child_die, NULL, cu);
15849 template_args->push_back (arg);
15851 else if (child_die->tag == DW_TAG_variant)
15853 /* In a variant we want to get the discriminant and also add a
15854 field for our sole member child. */
15855 struct attribute *discr = dwarf2_attr (child_die, DW_AT_discr_value, cu);
15857 for (struct die_info *variant_child = child_die->child;
15858 variant_child != NULL;
15859 variant_child = sibling_die (variant_child))
15861 if (variant_child->tag == DW_TAG_member)
15863 handle_struct_member_die (variant_child, type, fi,
15864 template_args, cu);
15865 /* Only handle the one. */
15870 /* We don't handle this but we might as well report it if we see
15872 if (dwarf2_attr (child_die, DW_AT_discr_list, cu) != nullptr)
15873 complaint (&symfile_complaints,
15874 _("DW_AT_discr_list is not supported yet"
15875 " - DIE at %s [in module %s]"),
15876 sect_offset_str (child_die->sect_off),
15877 objfile_name (cu->per_cu->dwarf2_per_objfile->objfile));
15879 /* The first field was just added, so we can stash the
15880 discriminant there. */
15881 gdb_assert (!fi->fields.empty ());
15883 fi->fields.back ().variant.default_branch = true;
15885 fi->fields.back ().variant.discriminant_value = DW_UNSND (discr);
15889 /* Finish creating a structure or union type, including filling in
15890 its members and creating a symbol for it. */
15893 process_structure_scope (struct die_info *die, struct dwarf2_cu *cu)
15895 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
15896 struct die_info *child_die;
15899 type = get_die_type (die, cu);
15901 type = read_structure_type (die, cu);
15903 /* When reading a DW_TAG_variant_part, we need to notice when we
15904 read the discriminant member, so we can record it later in the
15905 discriminant_info. */
15906 bool is_variant_part = TYPE_FLAG_DISCRIMINATED_UNION (type);
15907 sect_offset discr_offset;
15909 if (is_variant_part)
15911 struct attribute *discr = dwarf2_attr (die, DW_AT_discr, cu);
15914 /* Maybe it's a univariant form, an extension we support.
15915 In this case arrange not to check the offset. */
15916 is_variant_part = false;
15918 else if (attr_form_is_ref (discr))
15920 struct dwarf2_cu *target_cu = cu;
15921 struct die_info *target_die = follow_die_ref (die, discr, &target_cu);
15923 discr_offset = target_die->sect_off;
15927 complaint (&symfile_complaints,
15928 _("DW_AT_discr does not have DIE reference form"
15929 " - DIE at %s [in module %s]"),
15930 sect_offset_str (die->sect_off),
15931 objfile_name (cu->per_cu->dwarf2_per_objfile->objfile));
15932 is_variant_part = false;
15936 if (die->child != NULL && ! die_is_declaration (die, cu))
15938 struct field_info fi;
15939 std::vector<struct symbol *> template_args;
15941 child_die = die->child;
15943 while (child_die && child_die->tag)
15945 handle_struct_member_die (child_die, type, &fi, &template_args, cu);
15947 if (is_variant_part && discr_offset == child_die->sect_off)
15948 fi.fields.back ().variant.is_discriminant = true;
15950 child_die = sibling_die (child_die);
15953 /* Attach template arguments to type. */
15954 if (!template_args.empty ())
15956 ALLOCATE_CPLUS_STRUCT_TYPE (type);
15957 TYPE_N_TEMPLATE_ARGUMENTS (type) = template_args.size ();
15958 TYPE_TEMPLATE_ARGUMENTS (type)
15959 = XOBNEWVEC (&objfile->objfile_obstack,
15961 TYPE_N_TEMPLATE_ARGUMENTS (type));
15962 memcpy (TYPE_TEMPLATE_ARGUMENTS (type),
15963 template_args.data (),
15964 (TYPE_N_TEMPLATE_ARGUMENTS (type)
15965 * sizeof (struct symbol *)));
15968 /* Attach fields and member functions to the type. */
15970 dwarf2_attach_fields_to_type (&fi, type, cu);
15971 if (!fi.fnfieldlists.empty ())
15973 dwarf2_attach_fn_fields_to_type (&fi, type, cu);
15975 /* Get the type which refers to the base class (possibly this
15976 class itself) which contains the vtable pointer for the current
15977 class from the DW_AT_containing_type attribute. This use of
15978 DW_AT_containing_type is a GNU extension. */
15980 if (dwarf2_attr (die, DW_AT_containing_type, cu) != NULL)
15982 struct type *t = die_containing_type (die, cu);
15984 set_type_vptr_basetype (type, t);
15989 /* Our own class provides vtbl ptr. */
15990 for (i = TYPE_NFIELDS (t) - 1;
15991 i >= TYPE_N_BASECLASSES (t);
15994 const char *fieldname = TYPE_FIELD_NAME (t, i);
15996 if (is_vtable_name (fieldname, cu))
15998 set_type_vptr_fieldno (type, i);
16003 /* Complain if virtual function table field not found. */
16004 if (i < TYPE_N_BASECLASSES (t))
16005 complaint (&symfile_complaints,
16006 _("virtual function table pointer "
16007 "not found when defining class '%s'"),
16008 TYPE_TAG_NAME (type) ? TYPE_TAG_NAME (type) :
16013 set_type_vptr_fieldno (type, TYPE_VPTR_FIELDNO (t));
16016 else if (cu->producer
16017 && startswith (cu->producer, "IBM(R) XL C/C++ Advanced Edition"))
16019 /* The IBM XLC compiler does not provide direct indication
16020 of the containing type, but the vtable pointer is
16021 always named __vfp. */
16025 for (i = TYPE_NFIELDS (type) - 1;
16026 i >= TYPE_N_BASECLASSES (type);
16029 if (strcmp (TYPE_FIELD_NAME (type, i), "__vfp") == 0)
16031 set_type_vptr_fieldno (type, i);
16032 set_type_vptr_basetype (type, type);
16039 /* Copy fi.typedef_field_list linked list elements content into the
16040 allocated array TYPE_TYPEDEF_FIELD_ARRAY (type). */
16041 if (!fi.typedef_field_list.empty ())
16043 int count = fi.typedef_field_list.size ();
16045 ALLOCATE_CPLUS_STRUCT_TYPE (type);
16046 TYPE_TYPEDEF_FIELD_ARRAY (type)
16047 = ((struct decl_field *)
16049 sizeof (TYPE_TYPEDEF_FIELD (type, 0)) * count));
16050 TYPE_TYPEDEF_FIELD_COUNT (type) = count;
16052 for (int i = 0; i < fi.typedef_field_list.size (); ++i)
16053 TYPE_TYPEDEF_FIELD (type, i) = fi.typedef_field_list[i];
16056 /* Copy fi.nested_types_list linked list elements content into the
16057 allocated array TYPE_NESTED_TYPES_ARRAY (type). */
16058 if (!fi.nested_types_list.empty () && cu->language != language_ada)
16060 int count = fi.nested_types_list.size ();
16062 ALLOCATE_CPLUS_STRUCT_TYPE (type);
16063 TYPE_NESTED_TYPES_ARRAY (type)
16064 = ((struct decl_field *)
16065 TYPE_ALLOC (type, sizeof (struct decl_field) * count));
16066 TYPE_NESTED_TYPES_COUNT (type) = count;
16068 for (int i = 0; i < fi.nested_types_list.size (); ++i)
16069 TYPE_NESTED_TYPES_FIELD (type, i) = fi.nested_types_list[i];
16073 quirk_gcc_member_function_pointer (type, objfile);
16074 if (cu->language == language_rust && die->tag == DW_TAG_union_type)
16075 cu->rust_unions.push_back (type);
16077 /* NOTE: carlton/2004-03-16: GCC 3.4 (or at least one of its
16078 snapshots) has been known to create a die giving a declaration
16079 for a class that has, as a child, a die giving a definition for a
16080 nested class. So we have to process our children even if the
16081 current die is a declaration. Normally, of course, a declaration
16082 won't have any children at all. */
16084 child_die = die->child;
16086 while (child_die != NULL && child_die->tag)
16088 if (child_die->tag == DW_TAG_member
16089 || child_die->tag == DW_TAG_variable
16090 || child_die->tag == DW_TAG_inheritance
16091 || child_die->tag == DW_TAG_template_value_param
16092 || child_die->tag == DW_TAG_template_type_param)
16097 process_die (child_die, cu);
16099 child_die = sibling_die (child_die);
16102 /* Do not consider external references. According to the DWARF standard,
16103 these DIEs are identified by the fact that they have no byte_size
16104 attribute, and a declaration attribute. */
16105 if (dwarf2_attr (die, DW_AT_byte_size, cu) != NULL
16106 || !die_is_declaration (die, cu))
16107 new_symbol (die, type, cu);
16110 /* Assuming DIE is an enumeration type, and TYPE is its associated type,
16111 update TYPE using some information only available in DIE's children. */
16114 update_enumeration_type_from_children (struct die_info *die,
16116 struct dwarf2_cu *cu)
16118 struct die_info *child_die;
16119 int unsigned_enum = 1;
16123 auto_obstack obstack;
16125 for (child_die = die->child;
16126 child_die != NULL && child_die->tag;
16127 child_die = sibling_die (child_die))
16129 struct attribute *attr;
16131 const gdb_byte *bytes;
16132 struct dwarf2_locexpr_baton *baton;
16135 if (child_die->tag != DW_TAG_enumerator)
16138 attr = dwarf2_attr (child_die, DW_AT_const_value, cu);
16142 name = dwarf2_name (child_die, cu);
16144 name = "<anonymous enumerator>";
16146 dwarf2_const_value_attr (attr, type, name, &obstack, cu,
16147 &value, &bytes, &baton);
16153 else if ((mask & value) != 0)
16158 /* If we already know that the enum type is neither unsigned, nor
16159 a flag type, no need to look at the rest of the enumerates. */
16160 if (!unsigned_enum && !flag_enum)
16165 TYPE_UNSIGNED (type) = 1;
16167 TYPE_FLAG_ENUM (type) = 1;
16170 /* Given a DW_AT_enumeration_type die, set its type. We do not
16171 complete the type's fields yet, or create any symbols. */
16173 static struct type *
16174 read_enumeration_type (struct die_info *die, struct dwarf2_cu *cu)
16176 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
16178 struct attribute *attr;
16181 /* If the definition of this type lives in .debug_types, read that type.
16182 Don't follow DW_AT_specification though, that will take us back up
16183 the chain and we want to go down. */
16184 attr = dwarf2_attr_no_follow (die, DW_AT_signature);
16187 type = get_DW_AT_signature_type (die, attr, cu);
16189 /* The type's CU may not be the same as CU.
16190 Ensure TYPE is recorded with CU in die_type_hash. */
16191 return set_die_type (die, type, cu);
16194 type = alloc_type (objfile);
16196 TYPE_CODE (type) = TYPE_CODE_ENUM;
16197 name = dwarf2_full_name (NULL, die, cu);
16199 TYPE_TAG_NAME (type) = name;
16201 attr = dwarf2_attr (die, DW_AT_type, cu);
16204 struct type *underlying_type = die_type (die, cu);
16206 TYPE_TARGET_TYPE (type) = underlying_type;
16209 attr = dwarf2_attr (die, DW_AT_byte_size, cu);
16212 TYPE_LENGTH (type) = DW_UNSND (attr);
16216 TYPE_LENGTH (type) = 0;
16219 maybe_set_alignment (cu, die, type);
16221 /* The enumeration DIE can be incomplete. In Ada, any type can be
16222 declared as private in the package spec, and then defined only
16223 inside the package body. Such types are known as Taft Amendment
16224 Types. When another package uses such a type, an incomplete DIE
16225 may be generated by the compiler. */
16226 if (die_is_declaration (die, cu))
16227 TYPE_STUB (type) = 1;
16229 /* Finish the creation of this type by using the enum's children.
16230 We must call this even when the underlying type has been provided
16231 so that we can determine if we're looking at a "flag" enum. */
16232 update_enumeration_type_from_children (die, type, cu);
16234 /* If this type has an underlying type that is not a stub, then we
16235 may use its attributes. We always use the "unsigned" attribute
16236 in this situation, because ordinarily we guess whether the type
16237 is unsigned -- but the guess can be wrong and the underlying type
16238 can tell us the reality. However, we defer to a local size
16239 attribute if one exists, because this lets the compiler override
16240 the underlying type if needed. */
16241 if (TYPE_TARGET_TYPE (type) != NULL && !TYPE_STUB (TYPE_TARGET_TYPE (type)))
16243 TYPE_UNSIGNED (type) = TYPE_UNSIGNED (TYPE_TARGET_TYPE (type));
16244 if (TYPE_LENGTH (type) == 0)
16245 TYPE_LENGTH (type) = TYPE_LENGTH (TYPE_TARGET_TYPE (type));
16246 if (TYPE_RAW_ALIGN (type) == 0
16247 && TYPE_RAW_ALIGN (TYPE_TARGET_TYPE (type)) != 0)
16248 set_type_align (type, TYPE_RAW_ALIGN (TYPE_TARGET_TYPE (type)));
16251 TYPE_DECLARED_CLASS (type) = dwarf2_flag_true_p (die, DW_AT_enum_class, cu);
16253 return set_die_type (die, type, cu);
16256 /* Given a pointer to a die which begins an enumeration, process all
16257 the dies that define the members of the enumeration, and create the
16258 symbol for the enumeration type.
16260 NOTE: We reverse the order of the element list. */
16263 process_enumeration_scope (struct die_info *die, struct dwarf2_cu *cu)
16265 struct type *this_type;
16267 this_type = get_die_type (die, cu);
16268 if (this_type == NULL)
16269 this_type = read_enumeration_type (die, cu);
16271 if (die->child != NULL)
16273 struct die_info *child_die;
16274 struct symbol *sym;
16275 struct field *fields = NULL;
16276 int num_fields = 0;
16279 child_die = die->child;
16280 while (child_die && child_die->tag)
16282 if (child_die->tag != DW_TAG_enumerator)
16284 process_die (child_die, cu);
16288 name = dwarf2_name (child_die, cu);
16291 sym = new_symbol (child_die, this_type, cu);
16293 if ((num_fields % DW_FIELD_ALLOC_CHUNK) == 0)
16295 fields = (struct field *)
16297 (num_fields + DW_FIELD_ALLOC_CHUNK)
16298 * sizeof (struct field));
16301 FIELD_NAME (fields[num_fields]) = SYMBOL_LINKAGE_NAME (sym);
16302 FIELD_TYPE (fields[num_fields]) = NULL;
16303 SET_FIELD_ENUMVAL (fields[num_fields], SYMBOL_VALUE (sym));
16304 FIELD_BITSIZE (fields[num_fields]) = 0;
16310 child_die = sibling_die (child_die);
16315 TYPE_NFIELDS (this_type) = num_fields;
16316 TYPE_FIELDS (this_type) = (struct field *)
16317 TYPE_ALLOC (this_type, sizeof (struct field) * num_fields);
16318 memcpy (TYPE_FIELDS (this_type), fields,
16319 sizeof (struct field) * num_fields);
16324 /* If we are reading an enum from a .debug_types unit, and the enum
16325 is a declaration, and the enum is not the signatured type in the
16326 unit, then we do not want to add a symbol for it. Adding a
16327 symbol would in some cases obscure the true definition of the
16328 enum, giving users an incomplete type when the definition is
16329 actually available. Note that we do not want to do this for all
16330 enums which are just declarations, because C++0x allows forward
16331 enum declarations. */
16332 if (cu->per_cu->is_debug_types
16333 && die_is_declaration (die, cu))
16335 struct signatured_type *sig_type;
16337 sig_type = (struct signatured_type *) cu->per_cu;
16338 gdb_assert (to_underlying (sig_type->type_offset_in_section) != 0);
16339 if (sig_type->type_offset_in_section != die->sect_off)
16343 new_symbol (die, this_type, cu);
16346 /* Extract all information from a DW_TAG_array_type DIE and put it in
16347 the DIE's type field. For now, this only handles one dimensional
16350 static struct type *
16351 read_array_type (struct die_info *die, struct dwarf2_cu *cu)
16353 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
16354 struct die_info *child_die;
16356 struct type *element_type, *range_type, *index_type;
16357 struct attribute *attr;
16359 struct dynamic_prop *byte_stride_prop = NULL;
16360 unsigned int bit_stride = 0;
16362 element_type = die_type (die, cu);
16364 /* The die_type call above may have already set the type for this DIE. */
16365 type = get_die_type (die, cu);
16369 attr = dwarf2_attr (die, DW_AT_byte_stride, cu);
16375 = (struct dynamic_prop *) alloca (sizeof (struct dynamic_prop));
16376 stride_ok = attr_to_dynamic_prop (attr, die, cu, byte_stride_prop);
16379 complaint (&symfile_complaints,
16380 _("unable to read array DW_AT_byte_stride "
16381 " - DIE at %s [in module %s]"),
16382 sect_offset_str (die->sect_off),
16383 objfile_name (cu->per_cu->dwarf2_per_objfile->objfile));
16384 /* Ignore this attribute. We will likely not be able to print
16385 arrays of this type correctly, but there is little we can do
16386 to help if we cannot read the attribute's value. */
16387 byte_stride_prop = NULL;
16391 attr = dwarf2_attr (die, DW_AT_bit_stride, cu);
16393 bit_stride = DW_UNSND (attr);
16395 /* Irix 6.2 native cc creates array types without children for
16396 arrays with unspecified length. */
16397 if (die->child == NULL)
16399 index_type = objfile_type (objfile)->builtin_int;
16400 range_type = create_static_range_type (NULL, index_type, 0, -1);
16401 type = create_array_type_with_stride (NULL, element_type, range_type,
16402 byte_stride_prop, bit_stride);
16403 return set_die_type (die, type, cu);
16406 std::vector<struct type *> range_types;
16407 child_die = die->child;
16408 while (child_die && child_die->tag)
16410 if (child_die->tag == DW_TAG_subrange_type)
16412 struct type *child_type = read_type_die (child_die, cu);
16414 if (child_type != NULL)
16416 /* The range type was succesfully read. Save it for the
16417 array type creation. */
16418 range_types.push_back (child_type);
16421 child_die = sibling_die (child_die);
16424 /* Dwarf2 dimensions are output from left to right, create the
16425 necessary array types in backwards order. */
16427 type = element_type;
16429 if (read_array_order (die, cu) == DW_ORD_col_major)
16433 while (i < range_types.size ())
16434 type = create_array_type_with_stride (NULL, type, range_types[i++],
16435 byte_stride_prop, bit_stride);
16439 size_t ndim = range_types.size ();
16441 type = create_array_type_with_stride (NULL, type, range_types[ndim],
16442 byte_stride_prop, bit_stride);
16445 /* Understand Dwarf2 support for vector types (like they occur on
16446 the PowerPC w/ AltiVec). Gcc just adds another attribute to the
16447 array type. This is not part of the Dwarf2/3 standard yet, but a
16448 custom vendor extension. The main difference between a regular
16449 array and the vector variant is that vectors are passed by value
16451 attr = dwarf2_attr (die, DW_AT_GNU_vector, cu);
16453 make_vector_type (type);
16455 /* The DIE may have DW_AT_byte_size set. For example an OpenCL
16456 implementation may choose to implement triple vectors using this
16458 attr = dwarf2_attr (die, DW_AT_byte_size, cu);
16461 if (DW_UNSND (attr) >= TYPE_LENGTH (type))
16462 TYPE_LENGTH (type) = DW_UNSND (attr);
16464 complaint (&symfile_complaints,
16465 _("DW_AT_byte_size for array type smaller "
16466 "than the total size of elements"));
16469 name = dwarf2_name (die, cu);
16471 TYPE_NAME (type) = name;
16473 maybe_set_alignment (cu, die, type);
16475 /* Install the type in the die. */
16476 set_die_type (die, type, cu);
16478 /* set_die_type should be already done. */
16479 set_descriptive_type (type, die, cu);
16484 static enum dwarf_array_dim_ordering
16485 read_array_order (struct die_info *die, struct dwarf2_cu *cu)
16487 struct attribute *attr;
16489 attr = dwarf2_attr (die, DW_AT_ordering, cu);
16492 return (enum dwarf_array_dim_ordering) DW_SND (attr);
16494 /* GNU F77 is a special case, as at 08/2004 array type info is the
16495 opposite order to the dwarf2 specification, but data is still
16496 laid out as per normal fortran.
16498 FIXME: dsl/2004-8-20: If G77 is ever fixed, this will also need
16499 version checking. */
16501 if (cu->language == language_fortran
16502 && cu->producer && strstr (cu->producer, "GNU F77"))
16504 return DW_ORD_row_major;
16507 switch (cu->language_defn->la_array_ordering)
16509 case array_column_major:
16510 return DW_ORD_col_major;
16511 case array_row_major:
16513 return DW_ORD_row_major;
16517 /* Extract all information from a DW_TAG_set_type DIE and put it in
16518 the DIE's type field. */
16520 static struct type *
16521 read_set_type (struct die_info *die, struct dwarf2_cu *cu)
16523 struct type *domain_type, *set_type;
16524 struct attribute *attr;
16526 domain_type = die_type (die, cu);
16528 /* The die_type call above may have already set the type for this DIE. */
16529 set_type = get_die_type (die, cu);
16533 set_type = create_set_type (NULL, domain_type);
16535 attr = dwarf2_attr (die, DW_AT_byte_size, cu);
16537 TYPE_LENGTH (set_type) = DW_UNSND (attr);
16539 maybe_set_alignment (cu, die, set_type);
16541 return set_die_type (die, set_type, cu);
16544 /* A helper for read_common_block that creates a locexpr baton.
16545 SYM is the symbol which we are marking as computed.
16546 COMMON_DIE is the DIE for the common block.
16547 COMMON_LOC is the location expression attribute for the common
16549 MEMBER_LOC is the location expression attribute for the particular
16550 member of the common block that we are processing.
16551 CU is the CU from which the above come. */
16554 mark_common_block_symbol_computed (struct symbol *sym,
16555 struct die_info *common_die,
16556 struct attribute *common_loc,
16557 struct attribute *member_loc,
16558 struct dwarf2_cu *cu)
16560 struct dwarf2_per_objfile *dwarf2_per_objfile
16561 = cu->per_cu->dwarf2_per_objfile;
16562 struct objfile *objfile = dwarf2_per_objfile->objfile;
16563 struct dwarf2_locexpr_baton *baton;
16565 unsigned int cu_off;
16566 enum bfd_endian byte_order = gdbarch_byte_order (get_objfile_arch (objfile));
16567 LONGEST offset = 0;
16569 gdb_assert (common_loc && member_loc);
16570 gdb_assert (attr_form_is_block (common_loc));
16571 gdb_assert (attr_form_is_block (member_loc)
16572 || attr_form_is_constant (member_loc));
16574 baton = XOBNEW (&objfile->objfile_obstack, struct dwarf2_locexpr_baton);
16575 baton->per_cu = cu->per_cu;
16576 gdb_assert (baton->per_cu);
16578 baton->size = 5 /* DW_OP_call4 */ + 1 /* DW_OP_plus */;
16580 if (attr_form_is_constant (member_loc))
16582 offset = dwarf2_get_attr_constant_value (member_loc, 0);
16583 baton->size += 1 /* DW_OP_addr */ + cu->header.addr_size;
16586 baton->size += DW_BLOCK (member_loc)->size;
16588 ptr = (gdb_byte *) obstack_alloc (&objfile->objfile_obstack, baton->size);
16591 *ptr++ = DW_OP_call4;
16592 cu_off = common_die->sect_off - cu->per_cu->sect_off;
16593 store_unsigned_integer (ptr, 4, byte_order, cu_off);
16596 if (attr_form_is_constant (member_loc))
16598 *ptr++ = DW_OP_addr;
16599 store_unsigned_integer (ptr, cu->header.addr_size, byte_order, offset);
16600 ptr += cu->header.addr_size;
16604 /* We have to copy the data here, because DW_OP_call4 will only
16605 use a DW_AT_location attribute. */
16606 memcpy (ptr, DW_BLOCK (member_loc)->data, DW_BLOCK (member_loc)->size);
16607 ptr += DW_BLOCK (member_loc)->size;
16610 *ptr++ = DW_OP_plus;
16611 gdb_assert (ptr - baton->data == baton->size);
16613 SYMBOL_LOCATION_BATON (sym) = baton;
16614 SYMBOL_ACLASS_INDEX (sym) = dwarf2_locexpr_index;
16617 /* Create appropriate locally-scoped variables for all the
16618 DW_TAG_common_block entries. Also create a struct common_block
16619 listing all such variables for `info common'. COMMON_BLOCK_DOMAIN
16620 is used to sepate the common blocks name namespace from regular
16624 read_common_block (struct die_info *die, struct dwarf2_cu *cu)
16626 struct attribute *attr;
16628 attr = dwarf2_attr (die, DW_AT_location, cu);
16631 /* Support the .debug_loc offsets. */
16632 if (attr_form_is_block (attr))
16636 else if (attr_form_is_section_offset (attr))
16638 dwarf2_complex_location_expr_complaint ();
16643 dwarf2_invalid_attrib_class_complaint ("DW_AT_location",
16644 "common block member");
16649 if (die->child != NULL)
16651 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
16652 struct die_info *child_die;
16653 size_t n_entries = 0, size;
16654 struct common_block *common_block;
16655 struct symbol *sym;
16657 for (child_die = die->child;
16658 child_die && child_die->tag;
16659 child_die = sibling_die (child_die))
16662 size = (sizeof (struct common_block)
16663 + (n_entries - 1) * sizeof (struct symbol *));
16665 = (struct common_block *) obstack_alloc (&objfile->objfile_obstack,
16667 memset (common_block->contents, 0, n_entries * sizeof (struct symbol *));
16668 common_block->n_entries = 0;
16670 for (child_die = die->child;
16671 child_die && child_die->tag;
16672 child_die = sibling_die (child_die))
16674 /* Create the symbol in the DW_TAG_common_block block in the current
16676 sym = new_symbol (child_die, NULL, cu);
16679 struct attribute *member_loc;
16681 common_block->contents[common_block->n_entries++] = sym;
16683 member_loc = dwarf2_attr (child_die, DW_AT_data_member_location,
16687 /* GDB has handled this for a long time, but it is
16688 not specified by DWARF. It seems to have been
16689 emitted by gfortran at least as recently as:
16690 http://gcc.gnu.org/bugzilla/show_bug.cgi?id=23057. */
16691 complaint (&symfile_complaints,
16692 _("Variable in common block has "
16693 "DW_AT_data_member_location "
16694 "- DIE at %s [in module %s]"),
16695 sect_offset_str (child_die->sect_off),
16696 objfile_name (objfile));
16698 if (attr_form_is_section_offset (member_loc))
16699 dwarf2_complex_location_expr_complaint ();
16700 else if (attr_form_is_constant (member_loc)
16701 || attr_form_is_block (member_loc))
16704 mark_common_block_symbol_computed (sym, die, attr,
16708 dwarf2_complex_location_expr_complaint ();
16713 sym = new_symbol (die, objfile_type (objfile)->builtin_void, cu);
16714 SYMBOL_VALUE_COMMON_BLOCK (sym) = common_block;
16718 /* Create a type for a C++ namespace. */
16720 static struct type *
16721 read_namespace_type (struct die_info *die, struct dwarf2_cu *cu)
16723 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
16724 const char *previous_prefix, *name;
16728 /* For extensions, reuse the type of the original namespace. */
16729 if (dwarf2_attr (die, DW_AT_extension, cu) != NULL)
16731 struct die_info *ext_die;
16732 struct dwarf2_cu *ext_cu = cu;
16734 ext_die = dwarf2_extension (die, &ext_cu);
16735 type = read_type_die (ext_die, ext_cu);
16737 /* EXT_CU may not be the same as CU.
16738 Ensure TYPE is recorded with CU in die_type_hash. */
16739 return set_die_type (die, type, cu);
16742 name = namespace_name (die, &is_anonymous, cu);
16744 /* Now build the name of the current namespace. */
16746 previous_prefix = determine_prefix (die, cu);
16747 if (previous_prefix[0] != '\0')
16748 name = typename_concat (&objfile->objfile_obstack,
16749 previous_prefix, name, 0, cu);
16751 /* Create the type. */
16752 type = init_type (objfile, TYPE_CODE_NAMESPACE, 0, name);
16753 TYPE_TAG_NAME (type) = TYPE_NAME (type);
16755 return set_die_type (die, type, cu);
16758 /* Read a namespace scope. */
16761 read_namespace (struct die_info *die, struct dwarf2_cu *cu)
16763 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
16766 /* Add a symbol associated to this if we haven't seen the namespace
16767 before. Also, add a using directive if it's an anonymous
16770 if (dwarf2_attr (die, DW_AT_extension, cu) == NULL)
16774 type = read_type_die (die, cu);
16775 new_symbol (die, type, cu);
16777 namespace_name (die, &is_anonymous, cu);
16780 const char *previous_prefix = determine_prefix (die, cu);
16782 std::vector<const char *> excludes;
16783 add_using_directive (using_directives (cu->language),
16784 previous_prefix, TYPE_NAME (type), NULL,
16785 NULL, excludes, 0, &objfile->objfile_obstack);
16789 if (die->child != NULL)
16791 struct die_info *child_die = die->child;
16793 while (child_die && child_die->tag)
16795 process_die (child_die, cu);
16796 child_die = sibling_die (child_die);
16801 /* Read a Fortran module as type. This DIE can be only a declaration used for
16802 imported module. Still we need that type as local Fortran "use ... only"
16803 declaration imports depend on the created type in determine_prefix. */
16805 static struct type *
16806 read_module_type (struct die_info *die, struct dwarf2_cu *cu)
16808 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
16809 const char *module_name;
16812 module_name = dwarf2_name (die, cu);
16814 complaint (&symfile_complaints,
16815 _("DW_TAG_module has no name, offset %s"),
16816 sect_offset_str (die->sect_off));
16817 type = init_type (objfile, TYPE_CODE_MODULE, 0, module_name);
16819 /* determine_prefix uses TYPE_TAG_NAME. */
16820 TYPE_TAG_NAME (type) = TYPE_NAME (type);
16822 return set_die_type (die, type, cu);
16825 /* Read a Fortran module. */
16828 read_module (struct die_info *die, struct dwarf2_cu *cu)
16830 struct die_info *child_die = die->child;
16833 type = read_type_die (die, cu);
16834 new_symbol (die, type, cu);
16836 while (child_die && child_die->tag)
16838 process_die (child_die, cu);
16839 child_die = sibling_die (child_die);
16843 /* Return the name of the namespace represented by DIE. Set
16844 *IS_ANONYMOUS to tell whether or not the namespace is an anonymous
16847 static const char *
16848 namespace_name (struct die_info *die, int *is_anonymous, struct dwarf2_cu *cu)
16850 struct die_info *current_die;
16851 const char *name = NULL;
16853 /* Loop through the extensions until we find a name. */
16855 for (current_die = die;
16856 current_die != NULL;
16857 current_die = dwarf2_extension (die, &cu))
16859 /* We don't use dwarf2_name here so that we can detect the absence
16860 of a name -> anonymous namespace. */
16861 name = dwarf2_string_attr (die, DW_AT_name, cu);
16867 /* Is it an anonymous namespace? */
16869 *is_anonymous = (name == NULL);
16871 name = CP_ANONYMOUS_NAMESPACE_STR;
16876 /* Extract all information from a DW_TAG_pointer_type DIE and add to
16877 the user defined type vector. */
16879 static struct type *
16880 read_tag_pointer_type (struct die_info *die, struct dwarf2_cu *cu)
16882 struct gdbarch *gdbarch
16883 = get_objfile_arch (cu->per_cu->dwarf2_per_objfile->objfile);
16884 struct comp_unit_head *cu_header = &cu->header;
16886 struct attribute *attr_byte_size;
16887 struct attribute *attr_address_class;
16888 int byte_size, addr_class;
16889 struct type *target_type;
16891 target_type = die_type (die, cu);
16893 /* The die_type call above may have already set the type for this DIE. */
16894 type = get_die_type (die, cu);
16898 type = lookup_pointer_type (target_type);
16900 attr_byte_size = dwarf2_attr (die, DW_AT_byte_size, cu);
16901 if (attr_byte_size)
16902 byte_size = DW_UNSND (attr_byte_size);
16904 byte_size = cu_header->addr_size;
16906 attr_address_class = dwarf2_attr (die, DW_AT_address_class, cu);
16907 if (attr_address_class)
16908 addr_class = DW_UNSND (attr_address_class);
16910 addr_class = DW_ADDR_none;
16912 ULONGEST alignment = get_alignment (cu, die);
16914 /* If the pointer size, alignment, or address class is different
16915 than the default, create a type variant marked as such and set
16916 the length accordingly. */
16917 if (TYPE_LENGTH (type) != byte_size
16918 || (alignment != 0 && TYPE_RAW_ALIGN (type) != 0
16919 && alignment != TYPE_RAW_ALIGN (type))
16920 || addr_class != DW_ADDR_none)
16922 if (gdbarch_address_class_type_flags_p (gdbarch))
16926 type_flags = gdbarch_address_class_type_flags
16927 (gdbarch, byte_size, addr_class);
16928 gdb_assert ((type_flags & ~TYPE_INSTANCE_FLAG_ADDRESS_CLASS_ALL)
16930 type = make_type_with_address_space (type, type_flags);
16932 else if (TYPE_LENGTH (type) != byte_size)
16934 complaint (&symfile_complaints,
16935 _("invalid pointer size %d"), byte_size);
16937 else if (TYPE_RAW_ALIGN (type) != alignment)
16939 complaint (&symfile_complaints,
16940 _("Invalid DW_AT_alignment"
16941 " - DIE at %s [in module %s]"),
16942 sect_offset_str (die->sect_off),
16943 objfile_name (cu->per_cu->dwarf2_per_objfile->objfile));
16947 /* Should we also complain about unhandled address classes? */
16951 TYPE_LENGTH (type) = byte_size;
16952 set_type_align (type, alignment);
16953 return set_die_type (die, type, cu);
16956 /* Extract all information from a DW_TAG_ptr_to_member_type DIE and add to
16957 the user defined type vector. */
16959 static struct type *
16960 read_tag_ptr_to_member_type (struct die_info *die, struct dwarf2_cu *cu)
16963 struct type *to_type;
16964 struct type *domain;
16966 to_type = die_type (die, cu);
16967 domain = die_containing_type (die, cu);
16969 /* The calls above may have already set the type for this DIE. */
16970 type = get_die_type (die, cu);
16974 if (TYPE_CODE (check_typedef (to_type)) == TYPE_CODE_METHOD)
16975 type = lookup_methodptr_type (to_type);
16976 else if (TYPE_CODE (check_typedef (to_type)) == TYPE_CODE_FUNC)
16978 struct type *new_type
16979 = alloc_type (cu->per_cu->dwarf2_per_objfile->objfile);
16981 smash_to_method_type (new_type, domain, TYPE_TARGET_TYPE (to_type),
16982 TYPE_FIELDS (to_type), TYPE_NFIELDS (to_type),
16983 TYPE_VARARGS (to_type));
16984 type = lookup_methodptr_type (new_type);
16987 type = lookup_memberptr_type (to_type, domain);
16989 return set_die_type (die, type, cu);
16992 /* Extract all information from a DW_TAG_{rvalue_,}reference_type DIE and add to
16993 the user defined type vector. */
16995 static struct type *
16996 read_tag_reference_type (struct die_info *die, struct dwarf2_cu *cu,
16997 enum type_code refcode)
16999 struct comp_unit_head *cu_header = &cu->header;
17000 struct type *type, *target_type;
17001 struct attribute *attr;
17003 gdb_assert (refcode == TYPE_CODE_REF || refcode == TYPE_CODE_RVALUE_REF);
17005 target_type = die_type (die, cu);
17007 /* The die_type call above may have already set the type for this DIE. */
17008 type = get_die_type (die, cu);
17012 type = lookup_reference_type (target_type, refcode);
17013 attr = dwarf2_attr (die, DW_AT_byte_size, cu);
17016 TYPE_LENGTH (type) = DW_UNSND (attr);
17020 TYPE_LENGTH (type) = cu_header->addr_size;
17022 maybe_set_alignment (cu, die, type);
17023 return set_die_type (die, type, cu);
17026 /* Add the given cv-qualifiers to the element type of the array. GCC
17027 outputs DWARF type qualifiers that apply to an array, not the
17028 element type. But GDB relies on the array element type to carry
17029 the cv-qualifiers. This mimics section 6.7.3 of the C99
17032 static struct type *
17033 add_array_cv_type (struct die_info *die, struct dwarf2_cu *cu,
17034 struct type *base_type, int cnst, int voltl)
17036 struct type *el_type, *inner_array;
17038 base_type = copy_type (base_type);
17039 inner_array = base_type;
17041 while (TYPE_CODE (TYPE_TARGET_TYPE (inner_array)) == TYPE_CODE_ARRAY)
17043 TYPE_TARGET_TYPE (inner_array) =
17044 copy_type (TYPE_TARGET_TYPE (inner_array));
17045 inner_array = TYPE_TARGET_TYPE (inner_array);
17048 el_type = TYPE_TARGET_TYPE (inner_array);
17049 cnst |= TYPE_CONST (el_type);
17050 voltl |= TYPE_VOLATILE (el_type);
17051 TYPE_TARGET_TYPE (inner_array) = make_cv_type (cnst, voltl, el_type, NULL);
17053 return set_die_type (die, base_type, cu);
17056 static struct type *
17057 read_tag_const_type (struct die_info *die, struct dwarf2_cu *cu)
17059 struct type *base_type, *cv_type;
17061 base_type = die_type (die, cu);
17063 /* The die_type call above may have already set the type for this DIE. */
17064 cv_type = get_die_type (die, cu);
17068 /* In case the const qualifier is applied to an array type, the element type
17069 is so qualified, not the array type (section 6.7.3 of C99). */
17070 if (TYPE_CODE (base_type) == TYPE_CODE_ARRAY)
17071 return add_array_cv_type (die, cu, base_type, 1, 0);
17073 cv_type = make_cv_type (1, TYPE_VOLATILE (base_type), base_type, 0);
17074 return set_die_type (die, cv_type, cu);
17077 static struct type *
17078 read_tag_volatile_type (struct die_info *die, struct dwarf2_cu *cu)
17080 struct type *base_type, *cv_type;
17082 base_type = die_type (die, cu);
17084 /* The die_type call above may have already set the type for this DIE. */
17085 cv_type = get_die_type (die, cu);
17089 /* In case the volatile qualifier is applied to an array type, the
17090 element type is so qualified, not the array type (section 6.7.3
17092 if (TYPE_CODE (base_type) == TYPE_CODE_ARRAY)
17093 return add_array_cv_type (die, cu, base_type, 0, 1);
17095 cv_type = make_cv_type (TYPE_CONST (base_type), 1, base_type, 0);
17096 return set_die_type (die, cv_type, cu);
17099 /* Handle DW_TAG_restrict_type. */
17101 static struct type *
17102 read_tag_restrict_type (struct die_info *die, struct dwarf2_cu *cu)
17104 struct type *base_type, *cv_type;
17106 base_type = die_type (die, cu);
17108 /* The die_type call above may have already set the type for this DIE. */
17109 cv_type = get_die_type (die, cu);
17113 cv_type = make_restrict_type (base_type);
17114 return set_die_type (die, cv_type, cu);
17117 /* Handle DW_TAG_atomic_type. */
17119 static struct type *
17120 read_tag_atomic_type (struct die_info *die, struct dwarf2_cu *cu)
17122 struct type *base_type, *cv_type;
17124 base_type = die_type (die, cu);
17126 /* The die_type call above may have already set the type for this DIE. */
17127 cv_type = get_die_type (die, cu);
17131 cv_type = make_atomic_type (base_type);
17132 return set_die_type (die, cv_type, cu);
17135 /* Extract all information from a DW_TAG_string_type DIE and add to
17136 the user defined type vector. It isn't really a user defined type,
17137 but it behaves like one, with other DIE's using an AT_user_def_type
17138 attribute to reference it. */
17140 static struct type *
17141 read_tag_string_type (struct die_info *die, struct dwarf2_cu *cu)
17143 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
17144 struct gdbarch *gdbarch = get_objfile_arch (objfile);
17145 struct type *type, *range_type, *index_type, *char_type;
17146 struct attribute *attr;
17147 unsigned int length;
17149 attr = dwarf2_attr (die, DW_AT_string_length, cu);
17152 length = DW_UNSND (attr);
17156 /* Check for the DW_AT_byte_size attribute. */
17157 attr = dwarf2_attr (die, DW_AT_byte_size, cu);
17160 length = DW_UNSND (attr);
17168 index_type = objfile_type (objfile)->builtin_int;
17169 range_type = create_static_range_type (NULL, index_type, 1, length);
17170 char_type = language_string_char_type (cu->language_defn, gdbarch);
17171 type = create_string_type (NULL, char_type, range_type);
17173 return set_die_type (die, type, cu);
17176 /* Assuming that DIE corresponds to a function, returns nonzero
17177 if the function is prototyped. */
17180 prototyped_function_p (struct die_info *die, struct dwarf2_cu *cu)
17182 struct attribute *attr;
17184 attr = dwarf2_attr (die, DW_AT_prototyped, cu);
17185 if (attr && (DW_UNSND (attr) != 0))
17188 /* The DWARF standard implies that the DW_AT_prototyped attribute
17189 is only meaninful for C, but the concept also extends to other
17190 languages that allow unprototyped functions (Eg: Objective C).
17191 For all other languages, assume that functions are always
17193 if (cu->language != language_c
17194 && cu->language != language_objc
17195 && cu->language != language_opencl)
17198 /* RealView does not emit DW_AT_prototyped. We can not distinguish
17199 prototyped and unprototyped functions; default to prototyped,
17200 since that is more common in modern code (and RealView warns
17201 about unprototyped functions). */
17202 if (producer_is_realview (cu->producer))
17208 /* Handle DIES due to C code like:
17212 int (*funcp)(int a, long l);
17216 ('funcp' generates a DW_TAG_subroutine_type DIE). */
17218 static struct type *
17219 read_subroutine_type (struct die_info *die, struct dwarf2_cu *cu)
17221 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
17222 struct type *type; /* Type that this function returns. */
17223 struct type *ftype; /* Function that returns above type. */
17224 struct attribute *attr;
17226 type = die_type (die, cu);
17228 /* The die_type call above may have already set the type for this DIE. */
17229 ftype = get_die_type (die, cu);
17233 ftype = lookup_function_type (type);
17235 if (prototyped_function_p (die, cu))
17236 TYPE_PROTOTYPED (ftype) = 1;
17238 /* Store the calling convention in the type if it's available in
17239 the subroutine die. Otherwise set the calling convention to
17240 the default value DW_CC_normal. */
17241 attr = dwarf2_attr (die, DW_AT_calling_convention, cu);
17243 TYPE_CALLING_CONVENTION (ftype) = DW_UNSND (attr);
17244 else if (cu->producer && strstr (cu->producer, "IBM XL C for OpenCL"))
17245 TYPE_CALLING_CONVENTION (ftype) = DW_CC_GDB_IBM_OpenCL;
17247 TYPE_CALLING_CONVENTION (ftype) = DW_CC_normal;
17249 /* Record whether the function returns normally to its caller or not
17250 if the DWARF producer set that information. */
17251 attr = dwarf2_attr (die, DW_AT_noreturn, cu);
17252 if (attr && (DW_UNSND (attr) != 0))
17253 TYPE_NO_RETURN (ftype) = 1;
17255 /* We need to add the subroutine type to the die immediately so
17256 we don't infinitely recurse when dealing with parameters
17257 declared as the same subroutine type. */
17258 set_die_type (die, ftype, cu);
17260 if (die->child != NULL)
17262 struct type *void_type = objfile_type (objfile)->builtin_void;
17263 struct die_info *child_die;
17264 int nparams, iparams;
17266 /* Count the number of parameters.
17267 FIXME: GDB currently ignores vararg functions, but knows about
17268 vararg member functions. */
17270 child_die = die->child;
17271 while (child_die && child_die->tag)
17273 if (child_die->tag == DW_TAG_formal_parameter)
17275 else if (child_die->tag == DW_TAG_unspecified_parameters)
17276 TYPE_VARARGS (ftype) = 1;
17277 child_die = sibling_die (child_die);
17280 /* Allocate storage for parameters and fill them in. */
17281 TYPE_NFIELDS (ftype) = nparams;
17282 TYPE_FIELDS (ftype) = (struct field *)
17283 TYPE_ZALLOC (ftype, nparams * sizeof (struct field));
17285 /* TYPE_FIELD_TYPE must never be NULL. Pre-fill the array to ensure it
17286 even if we error out during the parameters reading below. */
17287 for (iparams = 0; iparams < nparams; iparams++)
17288 TYPE_FIELD_TYPE (ftype, iparams) = void_type;
17291 child_die = die->child;
17292 while (child_die && child_die->tag)
17294 if (child_die->tag == DW_TAG_formal_parameter)
17296 struct type *arg_type;
17298 /* DWARF version 2 has no clean way to discern C++
17299 static and non-static member functions. G++ helps
17300 GDB by marking the first parameter for non-static
17301 member functions (which is the this pointer) as
17302 artificial. We pass this information to
17303 dwarf2_add_member_fn via TYPE_FIELD_ARTIFICIAL.
17305 DWARF version 3 added DW_AT_object_pointer, which GCC
17306 4.5 does not yet generate. */
17307 attr = dwarf2_attr (child_die, DW_AT_artificial, cu);
17309 TYPE_FIELD_ARTIFICIAL (ftype, iparams) = DW_UNSND (attr);
17311 TYPE_FIELD_ARTIFICIAL (ftype, iparams) = 0;
17312 arg_type = die_type (child_die, cu);
17314 /* RealView does not mark THIS as const, which the testsuite
17315 expects. GCC marks THIS as const in method definitions,
17316 but not in the class specifications (GCC PR 43053). */
17317 if (cu->language == language_cplus && !TYPE_CONST (arg_type)
17318 && TYPE_FIELD_ARTIFICIAL (ftype, iparams))
17321 struct dwarf2_cu *arg_cu = cu;
17322 const char *name = dwarf2_name (child_die, cu);
17324 attr = dwarf2_attr (die, DW_AT_object_pointer, cu);
17327 /* If the compiler emits this, use it. */
17328 if (follow_die_ref (die, attr, &arg_cu) == child_die)
17331 else if (name && strcmp (name, "this") == 0)
17332 /* Function definitions will have the argument names. */
17334 else if (name == NULL && iparams == 0)
17335 /* Declarations may not have the names, so like
17336 elsewhere in GDB, assume an artificial first
17337 argument is "this". */
17341 arg_type = make_cv_type (1, TYPE_VOLATILE (arg_type),
17345 TYPE_FIELD_TYPE (ftype, iparams) = arg_type;
17348 child_die = sibling_die (child_die);
17355 static struct type *
17356 read_typedef (struct die_info *die, struct dwarf2_cu *cu)
17358 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
17359 const char *name = NULL;
17360 struct type *this_type, *target_type;
17362 name = dwarf2_full_name (NULL, die, cu);
17363 this_type = init_type (objfile, TYPE_CODE_TYPEDEF, 0, name);
17364 TYPE_TARGET_STUB (this_type) = 1;
17365 set_die_type (die, this_type, cu);
17366 target_type = die_type (die, cu);
17367 if (target_type != this_type)
17368 TYPE_TARGET_TYPE (this_type) = target_type;
17371 /* Self-referential typedefs are, it seems, not allowed by the DWARF
17372 spec and cause infinite loops in GDB. */
17373 complaint (&symfile_complaints,
17374 _("Self-referential DW_TAG_typedef "
17375 "- DIE at %s [in module %s]"),
17376 sect_offset_str (die->sect_off), objfile_name (objfile));
17377 TYPE_TARGET_TYPE (this_type) = NULL;
17382 /* Allocate a floating-point type of size BITS and name NAME. Pass NAME_HINT
17383 (which may be different from NAME) to the architecture back-end to allow
17384 it to guess the correct format if necessary. */
17386 static struct type *
17387 dwarf2_init_float_type (struct objfile *objfile, int bits, const char *name,
17388 const char *name_hint)
17390 struct gdbarch *gdbarch = get_objfile_arch (objfile);
17391 const struct floatformat **format;
17394 format = gdbarch_floatformat_for_type (gdbarch, name_hint, bits);
17396 type = init_float_type (objfile, bits, name, format);
17398 type = init_type (objfile, TYPE_CODE_ERROR, bits, name);
17403 /* Find a representation of a given base type and install
17404 it in the TYPE field of the die. */
17406 static struct type *
17407 read_base_type (struct die_info *die, struct dwarf2_cu *cu)
17409 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
17411 struct attribute *attr;
17412 int encoding = 0, bits = 0;
17415 attr = dwarf2_attr (die, DW_AT_encoding, cu);
17418 encoding = DW_UNSND (attr);
17420 attr = dwarf2_attr (die, DW_AT_byte_size, cu);
17423 bits = DW_UNSND (attr) * TARGET_CHAR_BIT;
17425 name = dwarf2_name (die, cu);
17428 complaint (&symfile_complaints,
17429 _("DW_AT_name missing from DW_TAG_base_type"));
17434 case DW_ATE_address:
17435 /* Turn DW_ATE_address into a void * pointer. */
17436 type = init_type (objfile, TYPE_CODE_VOID, TARGET_CHAR_BIT, NULL);
17437 type = init_pointer_type (objfile, bits, name, type);
17439 case DW_ATE_boolean:
17440 type = init_boolean_type (objfile, bits, 1, name);
17442 case DW_ATE_complex_float:
17443 type = dwarf2_init_float_type (objfile, bits / 2, NULL, name);
17444 type = init_complex_type (objfile, name, type);
17446 case DW_ATE_decimal_float:
17447 type = init_decfloat_type (objfile, bits, name);
17450 type = dwarf2_init_float_type (objfile, bits, name, name);
17452 case DW_ATE_signed:
17453 type = init_integer_type (objfile, bits, 0, name);
17455 case DW_ATE_unsigned:
17456 if (cu->language == language_fortran
17458 && startswith (name, "character("))
17459 type = init_character_type (objfile, bits, 1, name);
17461 type = init_integer_type (objfile, bits, 1, name);
17463 case DW_ATE_signed_char:
17464 if (cu->language == language_ada || cu->language == language_m2
17465 || cu->language == language_pascal
17466 || cu->language == language_fortran)
17467 type = init_character_type (objfile, bits, 0, name);
17469 type = init_integer_type (objfile, bits, 0, name);
17471 case DW_ATE_unsigned_char:
17472 if (cu->language == language_ada || cu->language == language_m2
17473 || cu->language == language_pascal
17474 || cu->language == language_fortran
17475 || cu->language == language_rust)
17476 type = init_character_type (objfile, bits, 1, name);
17478 type = init_integer_type (objfile, bits, 1, name);
17482 gdbarch *arch = get_objfile_arch (objfile);
17485 type = builtin_type (arch)->builtin_char16;
17486 else if (bits == 32)
17487 type = builtin_type (arch)->builtin_char32;
17490 complaint (&symfile_complaints,
17491 _("unsupported DW_ATE_UTF bit size: '%d'"),
17493 type = init_integer_type (objfile, bits, 1, name);
17495 return set_die_type (die, type, cu);
17500 complaint (&symfile_complaints, _("unsupported DW_AT_encoding: '%s'"),
17501 dwarf_type_encoding_name (encoding));
17502 type = init_type (objfile, TYPE_CODE_ERROR, bits, name);
17506 if (name && strcmp (name, "char") == 0)
17507 TYPE_NOSIGN (type) = 1;
17509 maybe_set_alignment (cu, die, type);
17511 return set_die_type (die, type, cu);
17514 /* Parse dwarf attribute if it's a block, reference or constant and put the
17515 resulting value of the attribute into struct bound_prop.
17516 Returns 1 if ATTR could be resolved into PROP, 0 otherwise. */
17519 attr_to_dynamic_prop (const struct attribute *attr, struct die_info *die,
17520 struct dwarf2_cu *cu, struct dynamic_prop *prop)
17522 struct dwarf2_property_baton *baton;
17523 struct obstack *obstack
17524 = &cu->per_cu->dwarf2_per_objfile->objfile->objfile_obstack;
17526 if (attr == NULL || prop == NULL)
17529 if (attr_form_is_block (attr))
17531 baton = XOBNEW (obstack, struct dwarf2_property_baton);
17532 baton->referenced_type = NULL;
17533 baton->locexpr.per_cu = cu->per_cu;
17534 baton->locexpr.size = DW_BLOCK (attr)->size;
17535 baton->locexpr.data = DW_BLOCK (attr)->data;
17536 prop->data.baton = baton;
17537 prop->kind = PROP_LOCEXPR;
17538 gdb_assert (prop->data.baton != NULL);
17540 else if (attr_form_is_ref (attr))
17542 struct dwarf2_cu *target_cu = cu;
17543 struct die_info *target_die;
17544 struct attribute *target_attr;
17546 target_die = follow_die_ref (die, attr, &target_cu);
17547 target_attr = dwarf2_attr (target_die, DW_AT_location, target_cu);
17548 if (target_attr == NULL)
17549 target_attr = dwarf2_attr (target_die, DW_AT_data_member_location,
17551 if (target_attr == NULL)
17554 switch (target_attr->name)
17556 case DW_AT_location:
17557 if (attr_form_is_section_offset (target_attr))
17559 baton = XOBNEW (obstack, struct dwarf2_property_baton);
17560 baton->referenced_type = die_type (target_die, target_cu);
17561 fill_in_loclist_baton (cu, &baton->loclist, target_attr);
17562 prop->data.baton = baton;
17563 prop->kind = PROP_LOCLIST;
17564 gdb_assert (prop->data.baton != NULL);
17566 else if (attr_form_is_block (target_attr))
17568 baton = XOBNEW (obstack, struct dwarf2_property_baton);
17569 baton->referenced_type = die_type (target_die, target_cu);
17570 baton->locexpr.per_cu = cu->per_cu;
17571 baton->locexpr.size = DW_BLOCK (target_attr)->size;
17572 baton->locexpr.data = DW_BLOCK (target_attr)->data;
17573 prop->data.baton = baton;
17574 prop->kind = PROP_LOCEXPR;
17575 gdb_assert (prop->data.baton != NULL);
17579 dwarf2_invalid_attrib_class_complaint ("DW_AT_location",
17580 "dynamic property");
17584 case DW_AT_data_member_location:
17588 if (!handle_data_member_location (target_die, target_cu,
17592 baton = XOBNEW (obstack, struct dwarf2_property_baton);
17593 baton->referenced_type = read_type_die (target_die->parent,
17595 baton->offset_info.offset = offset;
17596 baton->offset_info.type = die_type (target_die, target_cu);
17597 prop->data.baton = baton;
17598 prop->kind = PROP_ADDR_OFFSET;
17603 else if (attr_form_is_constant (attr))
17605 prop->data.const_val = dwarf2_get_attr_constant_value (attr, 0);
17606 prop->kind = PROP_CONST;
17610 dwarf2_invalid_attrib_class_complaint (dwarf_form_name (attr->form),
17611 dwarf2_name (die, cu));
17618 /* Read the given DW_AT_subrange DIE. */
17620 static struct type *
17621 read_subrange_type (struct die_info *die, struct dwarf2_cu *cu)
17623 struct type *base_type, *orig_base_type;
17624 struct type *range_type;
17625 struct attribute *attr;
17626 struct dynamic_prop low, high;
17627 int low_default_is_valid;
17628 int high_bound_is_count = 0;
17630 LONGEST negative_mask;
17632 orig_base_type = die_type (die, cu);
17633 /* If ORIG_BASE_TYPE is a typedef, it will not be TYPE_UNSIGNED,
17634 whereas the real type might be. So, we use ORIG_BASE_TYPE when
17635 creating the range type, but we use the result of check_typedef
17636 when examining properties of the type. */
17637 base_type = check_typedef (orig_base_type);
17639 /* The die_type call above may have already set the type for this DIE. */
17640 range_type = get_die_type (die, cu);
17644 low.kind = PROP_CONST;
17645 high.kind = PROP_CONST;
17646 high.data.const_val = 0;
17648 /* Set LOW_DEFAULT_IS_VALID if current language and DWARF version allow
17649 omitting DW_AT_lower_bound. */
17650 switch (cu->language)
17653 case language_cplus:
17654 low.data.const_val = 0;
17655 low_default_is_valid = 1;
17657 case language_fortran:
17658 low.data.const_val = 1;
17659 low_default_is_valid = 1;
17662 case language_objc:
17663 case language_rust:
17664 low.data.const_val = 0;
17665 low_default_is_valid = (cu->header.version >= 4);
17669 case language_pascal:
17670 low.data.const_val = 1;
17671 low_default_is_valid = (cu->header.version >= 4);
17674 low.data.const_val = 0;
17675 low_default_is_valid = 0;
17679 attr = dwarf2_attr (die, DW_AT_lower_bound, cu);
17681 attr_to_dynamic_prop (attr, die, cu, &low);
17682 else if (!low_default_is_valid)
17683 complaint (&symfile_complaints, _("Missing DW_AT_lower_bound "
17684 "- DIE at %s [in module %s]"),
17685 sect_offset_str (die->sect_off),
17686 objfile_name (cu->per_cu->dwarf2_per_objfile->objfile));
17688 attr = dwarf2_attr (die, DW_AT_upper_bound, cu);
17689 if (!attr_to_dynamic_prop (attr, die, cu, &high))
17691 attr = dwarf2_attr (die, DW_AT_count, cu);
17692 if (attr_to_dynamic_prop (attr, die, cu, &high))
17694 /* If bounds are constant do the final calculation here. */
17695 if (low.kind == PROP_CONST && high.kind == PROP_CONST)
17696 high.data.const_val = low.data.const_val + high.data.const_val - 1;
17698 high_bound_is_count = 1;
17702 /* Dwarf-2 specifications explicitly allows to create subrange types
17703 without specifying a base type.
17704 In that case, the base type must be set to the type of
17705 the lower bound, upper bound or count, in that order, if any of these
17706 three attributes references an object that has a type.
17707 If no base type is found, the Dwarf-2 specifications say that
17708 a signed integer type of size equal to the size of an address should
17710 For the following C code: `extern char gdb_int [];'
17711 GCC produces an empty range DIE.
17712 FIXME: muller/2010-05-28: Possible references to object for low bound,
17713 high bound or count are not yet handled by this code. */
17714 if (TYPE_CODE (base_type) == TYPE_CODE_VOID)
17716 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
17717 struct gdbarch *gdbarch = get_objfile_arch (objfile);
17718 int addr_size = gdbarch_addr_bit (gdbarch) /8;
17719 struct type *int_type = objfile_type (objfile)->builtin_int;
17721 /* Test "int", "long int", and "long long int" objfile types,
17722 and select the first one having a size above or equal to the
17723 architecture address size. */
17724 if (int_type && TYPE_LENGTH (int_type) >= addr_size)
17725 base_type = int_type;
17728 int_type = objfile_type (objfile)->builtin_long;
17729 if (int_type && TYPE_LENGTH (int_type) >= addr_size)
17730 base_type = int_type;
17733 int_type = objfile_type (objfile)->builtin_long_long;
17734 if (int_type && TYPE_LENGTH (int_type) >= addr_size)
17735 base_type = int_type;
17740 /* Normally, the DWARF producers are expected to use a signed
17741 constant form (Eg. DW_FORM_sdata) to express negative bounds.
17742 But this is unfortunately not always the case, as witnessed
17743 with GCC, for instance, where the ambiguous DW_FORM_dataN form
17744 is used instead. To work around that ambiguity, we treat
17745 the bounds as signed, and thus sign-extend their values, when
17746 the base type is signed. */
17748 -((LONGEST) 1 << (TYPE_LENGTH (base_type) * TARGET_CHAR_BIT - 1));
17749 if (low.kind == PROP_CONST
17750 && !TYPE_UNSIGNED (base_type) && (low.data.const_val & negative_mask))
17751 low.data.const_val |= negative_mask;
17752 if (high.kind == PROP_CONST
17753 && !TYPE_UNSIGNED (base_type) && (high.data.const_val & negative_mask))
17754 high.data.const_val |= negative_mask;
17756 range_type = create_range_type (NULL, orig_base_type, &low, &high);
17758 if (high_bound_is_count)
17759 TYPE_RANGE_DATA (range_type)->flag_upper_bound_is_count = 1;
17761 /* Ada expects an empty array on no boundary attributes. */
17762 if (attr == NULL && cu->language != language_ada)
17763 TYPE_HIGH_BOUND_KIND (range_type) = PROP_UNDEFINED;
17765 name = dwarf2_name (die, cu);
17767 TYPE_NAME (range_type) = name;
17769 attr = dwarf2_attr (die, DW_AT_byte_size, cu);
17771 TYPE_LENGTH (range_type) = DW_UNSND (attr);
17773 maybe_set_alignment (cu, die, range_type);
17775 set_die_type (die, range_type, cu);
17777 /* set_die_type should be already done. */
17778 set_descriptive_type (range_type, die, cu);
17783 static struct type *
17784 read_unspecified_type (struct die_info *die, struct dwarf2_cu *cu)
17788 type = init_type (cu->per_cu->dwarf2_per_objfile->objfile, TYPE_CODE_VOID,0,
17790 TYPE_NAME (type) = dwarf2_name (die, cu);
17792 /* In Ada, an unspecified type is typically used when the description
17793 of the type is defered to a different unit. When encountering
17794 such a type, we treat it as a stub, and try to resolve it later on,
17796 if (cu->language == language_ada)
17797 TYPE_STUB (type) = 1;
17799 return set_die_type (die, type, cu);
17802 /* Read a single die and all its descendents. Set the die's sibling
17803 field to NULL; set other fields in the die correctly, and set all
17804 of the descendents' fields correctly. Set *NEW_INFO_PTR to the
17805 location of the info_ptr after reading all of those dies. PARENT
17806 is the parent of the die in question. */
17808 static struct die_info *
17809 read_die_and_children (const struct die_reader_specs *reader,
17810 const gdb_byte *info_ptr,
17811 const gdb_byte **new_info_ptr,
17812 struct die_info *parent)
17814 struct die_info *die;
17815 const gdb_byte *cur_ptr;
17818 cur_ptr = read_full_die_1 (reader, &die, info_ptr, &has_children, 0);
17821 *new_info_ptr = cur_ptr;
17824 store_in_ref_table (die, reader->cu);
17827 die->child = read_die_and_siblings_1 (reader, cur_ptr, new_info_ptr, die);
17831 *new_info_ptr = cur_ptr;
17834 die->sibling = NULL;
17835 die->parent = parent;
17839 /* Read a die, all of its descendents, and all of its siblings; set
17840 all of the fields of all of the dies correctly. Arguments are as
17841 in read_die_and_children. */
17843 static struct die_info *
17844 read_die_and_siblings_1 (const struct die_reader_specs *reader,
17845 const gdb_byte *info_ptr,
17846 const gdb_byte **new_info_ptr,
17847 struct die_info *parent)
17849 struct die_info *first_die, *last_sibling;
17850 const gdb_byte *cur_ptr;
17852 cur_ptr = info_ptr;
17853 first_die = last_sibling = NULL;
17857 struct die_info *die
17858 = read_die_and_children (reader, cur_ptr, &cur_ptr, parent);
17862 *new_info_ptr = cur_ptr;
17869 last_sibling->sibling = die;
17871 last_sibling = die;
17875 /* Read a die, all of its descendents, and all of its siblings; set
17876 all of the fields of all of the dies correctly. Arguments are as
17877 in read_die_and_children.
17878 This the main entry point for reading a DIE and all its children. */
17880 static struct die_info *
17881 read_die_and_siblings (const struct die_reader_specs *reader,
17882 const gdb_byte *info_ptr,
17883 const gdb_byte **new_info_ptr,
17884 struct die_info *parent)
17886 struct die_info *die = read_die_and_siblings_1 (reader, info_ptr,
17887 new_info_ptr, parent);
17889 if (dwarf_die_debug)
17891 fprintf_unfiltered (gdb_stdlog,
17892 "Read die from %s@0x%x of %s:\n",
17893 get_section_name (reader->die_section),
17894 (unsigned) (info_ptr - reader->die_section->buffer),
17895 bfd_get_filename (reader->abfd));
17896 dump_die (die, dwarf_die_debug);
17902 /* Read a die and all its attributes, leave space for NUM_EXTRA_ATTRS
17904 The caller is responsible for filling in the extra attributes
17905 and updating (*DIEP)->num_attrs.
17906 Set DIEP to point to a newly allocated die with its information,
17907 except for its child, sibling, and parent fields.
17908 Set HAS_CHILDREN to tell whether the die has children or not. */
17910 static const gdb_byte *
17911 read_full_die_1 (const struct die_reader_specs *reader,
17912 struct die_info **diep, const gdb_byte *info_ptr,
17913 int *has_children, int num_extra_attrs)
17915 unsigned int abbrev_number, bytes_read, i;
17916 struct abbrev_info *abbrev;
17917 struct die_info *die;
17918 struct dwarf2_cu *cu = reader->cu;
17919 bfd *abfd = reader->abfd;
17921 sect_offset sect_off = (sect_offset) (info_ptr - reader->buffer);
17922 abbrev_number = read_unsigned_leb128 (abfd, info_ptr, &bytes_read);
17923 info_ptr += bytes_read;
17924 if (!abbrev_number)
17931 abbrev = reader->abbrev_table->lookup_abbrev (abbrev_number);
17933 error (_("Dwarf Error: could not find abbrev number %d [in module %s]"),
17935 bfd_get_filename (abfd));
17937 die = dwarf_alloc_die (cu, abbrev->num_attrs + num_extra_attrs);
17938 die->sect_off = sect_off;
17939 die->tag = abbrev->tag;
17940 die->abbrev = abbrev_number;
17942 /* Make the result usable.
17943 The caller needs to update num_attrs after adding the extra
17945 die->num_attrs = abbrev->num_attrs;
17947 for (i = 0; i < abbrev->num_attrs; ++i)
17948 info_ptr = read_attribute (reader, &die->attrs[i], &abbrev->attrs[i],
17952 *has_children = abbrev->has_children;
17956 /* Read a die and all its attributes.
17957 Set DIEP to point to a newly allocated die with its information,
17958 except for its child, sibling, and parent fields.
17959 Set HAS_CHILDREN to tell whether the die has children or not. */
17961 static const gdb_byte *
17962 read_full_die (const struct die_reader_specs *reader,
17963 struct die_info **diep, const gdb_byte *info_ptr,
17966 const gdb_byte *result;
17968 result = read_full_die_1 (reader, diep, info_ptr, has_children, 0);
17970 if (dwarf_die_debug)
17972 fprintf_unfiltered (gdb_stdlog,
17973 "Read die from %s@0x%x of %s:\n",
17974 get_section_name (reader->die_section),
17975 (unsigned) (info_ptr - reader->die_section->buffer),
17976 bfd_get_filename (reader->abfd));
17977 dump_die (*diep, dwarf_die_debug);
17983 /* Abbreviation tables.
17985 In DWARF version 2, the description of the debugging information is
17986 stored in a separate .debug_abbrev section. Before we read any
17987 dies from a section we read in all abbreviations and install them
17988 in a hash table. */
17990 /* Allocate space for a struct abbrev_info object in ABBREV_TABLE. */
17992 struct abbrev_info *
17993 abbrev_table::alloc_abbrev ()
17995 struct abbrev_info *abbrev;
17997 abbrev = XOBNEW (&abbrev_obstack, struct abbrev_info);
17998 memset (abbrev, 0, sizeof (struct abbrev_info));
18003 /* Add an abbreviation to the table. */
18006 abbrev_table::add_abbrev (unsigned int abbrev_number,
18007 struct abbrev_info *abbrev)
18009 unsigned int hash_number;
18011 hash_number = abbrev_number % ABBREV_HASH_SIZE;
18012 abbrev->next = m_abbrevs[hash_number];
18013 m_abbrevs[hash_number] = abbrev;
18016 /* Look up an abbrev in the table.
18017 Returns NULL if the abbrev is not found. */
18019 struct abbrev_info *
18020 abbrev_table::lookup_abbrev (unsigned int abbrev_number)
18022 unsigned int hash_number;
18023 struct abbrev_info *abbrev;
18025 hash_number = abbrev_number % ABBREV_HASH_SIZE;
18026 abbrev = m_abbrevs[hash_number];
18030 if (abbrev->number == abbrev_number)
18032 abbrev = abbrev->next;
18037 /* Read in an abbrev table. */
18039 static abbrev_table_up
18040 abbrev_table_read_table (struct dwarf2_per_objfile *dwarf2_per_objfile,
18041 struct dwarf2_section_info *section,
18042 sect_offset sect_off)
18044 struct objfile *objfile = dwarf2_per_objfile->objfile;
18045 bfd *abfd = get_section_bfd_owner (section);
18046 const gdb_byte *abbrev_ptr;
18047 struct abbrev_info *cur_abbrev;
18048 unsigned int abbrev_number, bytes_read, abbrev_name;
18049 unsigned int abbrev_form;
18050 struct attr_abbrev *cur_attrs;
18051 unsigned int allocated_attrs;
18053 abbrev_table_up abbrev_table (new struct abbrev_table (sect_off));
18055 dwarf2_read_section (objfile, section);
18056 abbrev_ptr = section->buffer + to_underlying (sect_off);
18057 abbrev_number = read_unsigned_leb128 (abfd, abbrev_ptr, &bytes_read);
18058 abbrev_ptr += bytes_read;
18060 allocated_attrs = ATTR_ALLOC_CHUNK;
18061 cur_attrs = XNEWVEC (struct attr_abbrev, allocated_attrs);
18063 /* Loop until we reach an abbrev number of 0. */
18064 while (abbrev_number)
18066 cur_abbrev = abbrev_table->alloc_abbrev ();
18068 /* read in abbrev header */
18069 cur_abbrev->number = abbrev_number;
18071 = (enum dwarf_tag) read_unsigned_leb128 (abfd, abbrev_ptr, &bytes_read);
18072 abbrev_ptr += bytes_read;
18073 cur_abbrev->has_children = read_1_byte (abfd, abbrev_ptr);
18076 /* now read in declarations */
18079 LONGEST implicit_const;
18081 abbrev_name = read_unsigned_leb128 (abfd, abbrev_ptr, &bytes_read);
18082 abbrev_ptr += bytes_read;
18083 abbrev_form = read_unsigned_leb128 (abfd, abbrev_ptr, &bytes_read);
18084 abbrev_ptr += bytes_read;
18085 if (abbrev_form == DW_FORM_implicit_const)
18087 implicit_const = read_signed_leb128 (abfd, abbrev_ptr,
18089 abbrev_ptr += bytes_read;
18093 /* Initialize it due to a false compiler warning. */
18094 implicit_const = -1;
18097 if (abbrev_name == 0)
18100 if (cur_abbrev->num_attrs == allocated_attrs)
18102 allocated_attrs += ATTR_ALLOC_CHUNK;
18104 = XRESIZEVEC (struct attr_abbrev, cur_attrs, allocated_attrs);
18107 cur_attrs[cur_abbrev->num_attrs].name
18108 = (enum dwarf_attribute) abbrev_name;
18109 cur_attrs[cur_abbrev->num_attrs].form
18110 = (enum dwarf_form) abbrev_form;
18111 cur_attrs[cur_abbrev->num_attrs].implicit_const = implicit_const;
18112 ++cur_abbrev->num_attrs;
18115 cur_abbrev->attrs =
18116 XOBNEWVEC (&abbrev_table->abbrev_obstack, struct attr_abbrev,
18117 cur_abbrev->num_attrs);
18118 memcpy (cur_abbrev->attrs, cur_attrs,
18119 cur_abbrev->num_attrs * sizeof (struct attr_abbrev));
18121 abbrev_table->add_abbrev (abbrev_number, cur_abbrev);
18123 /* Get next abbreviation.
18124 Under Irix6 the abbreviations for a compilation unit are not
18125 always properly terminated with an abbrev number of 0.
18126 Exit loop if we encounter an abbreviation which we have
18127 already read (which means we are about to read the abbreviations
18128 for the next compile unit) or if the end of the abbreviation
18129 table is reached. */
18130 if ((unsigned int) (abbrev_ptr - section->buffer) >= section->size)
18132 abbrev_number = read_unsigned_leb128 (abfd, abbrev_ptr, &bytes_read);
18133 abbrev_ptr += bytes_read;
18134 if (abbrev_table->lookup_abbrev (abbrev_number) != NULL)
18139 return abbrev_table;
18142 /* Returns nonzero if TAG represents a type that we might generate a partial
18146 is_type_tag_for_partial (int tag)
18151 /* Some types that would be reasonable to generate partial symbols for,
18152 that we don't at present. */
18153 case DW_TAG_array_type:
18154 case DW_TAG_file_type:
18155 case DW_TAG_ptr_to_member_type:
18156 case DW_TAG_set_type:
18157 case DW_TAG_string_type:
18158 case DW_TAG_subroutine_type:
18160 case DW_TAG_base_type:
18161 case DW_TAG_class_type:
18162 case DW_TAG_interface_type:
18163 case DW_TAG_enumeration_type:
18164 case DW_TAG_structure_type:
18165 case DW_TAG_subrange_type:
18166 case DW_TAG_typedef:
18167 case DW_TAG_union_type:
18174 /* Load all DIEs that are interesting for partial symbols into memory. */
18176 static struct partial_die_info *
18177 load_partial_dies (const struct die_reader_specs *reader,
18178 const gdb_byte *info_ptr, int building_psymtab)
18180 struct dwarf2_cu *cu = reader->cu;
18181 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
18182 struct partial_die_info *parent_die, *last_die, *first_die = NULL;
18183 unsigned int bytes_read;
18184 unsigned int load_all = 0;
18185 int nesting_level = 1;
18190 gdb_assert (cu->per_cu != NULL);
18191 if (cu->per_cu->load_all_dies)
18195 = htab_create_alloc_ex (cu->header.length / 12,
18199 &cu->comp_unit_obstack,
18200 hashtab_obstack_allocate,
18201 dummy_obstack_deallocate);
18205 abbrev_info *abbrev = peek_die_abbrev (*reader, info_ptr, &bytes_read);
18207 /* A NULL abbrev means the end of a series of children. */
18208 if (abbrev == NULL)
18210 if (--nesting_level == 0)
18213 info_ptr += bytes_read;
18214 last_die = parent_die;
18215 parent_die = parent_die->die_parent;
18219 /* Check for template arguments. We never save these; if
18220 they're seen, we just mark the parent, and go on our way. */
18221 if (parent_die != NULL
18222 && cu->language == language_cplus
18223 && (abbrev->tag == DW_TAG_template_type_param
18224 || abbrev->tag == DW_TAG_template_value_param))
18226 parent_die->has_template_arguments = 1;
18230 /* We don't need a partial DIE for the template argument. */
18231 info_ptr = skip_one_die (reader, info_ptr + bytes_read, abbrev);
18236 /* We only recurse into c++ subprograms looking for template arguments.
18237 Skip their other children. */
18239 && cu->language == language_cplus
18240 && parent_die != NULL
18241 && parent_die->tag == DW_TAG_subprogram)
18243 info_ptr = skip_one_die (reader, info_ptr + bytes_read, abbrev);
18247 /* Check whether this DIE is interesting enough to save. Normally
18248 we would not be interested in members here, but there may be
18249 later variables referencing them via DW_AT_specification (for
18250 static members). */
18252 && !is_type_tag_for_partial (abbrev->tag)
18253 && abbrev->tag != DW_TAG_constant
18254 && abbrev->tag != DW_TAG_enumerator
18255 && abbrev->tag != DW_TAG_subprogram
18256 && abbrev->tag != DW_TAG_inlined_subroutine
18257 && abbrev->tag != DW_TAG_lexical_block
18258 && abbrev->tag != DW_TAG_variable
18259 && abbrev->tag != DW_TAG_namespace
18260 && abbrev->tag != DW_TAG_module
18261 && abbrev->tag != DW_TAG_member
18262 && abbrev->tag != DW_TAG_imported_unit
18263 && abbrev->tag != DW_TAG_imported_declaration)
18265 /* Otherwise we skip to the next sibling, if any. */
18266 info_ptr = skip_one_die (reader, info_ptr + bytes_read, abbrev);
18270 struct partial_die_info pdi ((sect_offset) (info_ptr - reader->buffer),
18273 info_ptr = pdi.read (reader, *abbrev, info_ptr + bytes_read);
18275 /* This two-pass algorithm for processing partial symbols has a
18276 high cost in cache pressure. Thus, handle some simple cases
18277 here which cover the majority of C partial symbols. DIEs
18278 which neither have specification tags in them, nor could have
18279 specification tags elsewhere pointing at them, can simply be
18280 processed and discarded.
18282 This segment is also optional; scan_partial_symbols and
18283 add_partial_symbol will handle these DIEs if we chain
18284 them in normally. When compilers which do not emit large
18285 quantities of duplicate debug information are more common,
18286 this code can probably be removed. */
18288 /* Any complete simple types at the top level (pretty much all
18289 of them, for a language without namespaces), can be processed
18291 if (parent_die == NULL
18292 && pdi.has_specification == 0
18293 && pdi.is_declaration == 0
18294 && ((pdi.tag == DW_TAG_typedef && !pdi.has_children)
18295 || pdi.tag == DW_TAG_base_type
18296 || pdi.tag == DW_TAG_subrange_type))
18298 if (building_psymtab && pdi.name != NULL)
18299 add_psymbol_to_list (pdi.name, strlen (pdi.name), 0,
18300 VAR_DOMAIN, LOC_TYPEDEF,
18301 &objfile->static_psymbols,
18302 0, cu->language, objfile);
18303 info_ptr = locate_pdi_sibling (reader, &pdi, info_ptr);
18307 /* The exception for DW_TAG_typedef with has_children above is
18308 a workaround of GCC PR debug/47510. In the case of this complaint
18309 type_name_no_tag_or_error will error on such types later.
18311 GDB skipped children of DW_TAG_typedef by the shortcut above and then
18312 it could not find the child DIEs referenced later, this is checked
18313 above. In correct DWARF DW_TAG_typedef should have no children. */
18315 if (pdi.tag == DW_TAG_typedef && pdi.has_children)
18316 complaint (&symfile_complaints,
18317 _("DW_TAG_typedef has childen - GCC PR debug/47510 bug "
18318 "- DIE at %s [in module %s]"),
18319 sect_offset_str (pdi.sect_off), objfile_name (objfile));
18321 /* If we're at the second level, and we're an enumerator, and
18322 our parent has no specification (meaning possibly lives in a
18323 namespace elsewhere), then we can add the partial symbol now
18324 instead of queueing it. */
18325 if (pdi.tag == DW_TAG_enumerator
18326 && parent_die != NULL
18327 && parent_die->die_parent == NULL
18328 && parent_die->tag == DW_TAG_enumeration_type
18329 && parent_die->has_specification == 0)
18331 if (pdi.name == NULL)
18332 complaint (&symfile_complaints,
18333 _("malformed enumerator DIE ignored"));
18334 else if (building_psymtab)
18335 add_psymbol_to_list (pdi.name, strlen (pdi.name), 0,
18336 VAR_DOMAIN, LOC_CONST,
18337 cu->language == language_cplus
18338 ? &objfile->global_psymbols
18339 : &objfile->static_psymbols,
18340 0, cu->language, objfile);
18342 info_ptr = locate_pdi_sibling (reader, &pdi, info_ptr);
18346 struct partial_die_info *part_die
18347 = new (&cu->comp_unit_obstack) partial_die_info (pdi);
18349 /* We'll save this DIE so link it in. */
18350 part_die->die_parent = parent_die;
18351 part_die->die_sibling = NULL;
18352 part_die->die_child = NULL;
18354 if (last_die && last_die == parent_die)
18355 last_die->die_child = part_die;
18357 last_die->die_sibling = part_die;
18359 last_die = part_die;
18361 if (first_die == NULL)
18362 first_die = part_die;
18364 /* Maybe add the DIE to the hash table. Not all DIEs that we
18365 find interesting need to be in the hash table, because we
18366 also have the parent/sibling/child chains; only those that we
18367 might refer to by offset later during partial symbol reading.
18369 For now this means things that might have be the target of a
18370 DW_AT_specification, DW_AT_abstract_origin, or
18371 DW_AT_extension. DW_AT_extension will refer only to
18372 namespaces; DW_AT_abstract_origin refers to functions (and
18373 many things under the function DIE, but we do not recurse
18374 into function DIEs during partial symbol reading) and
18375 possibly variables as well; DW_AT_specification refers to
18376 declarations. Declarations ought to have the DW_AT_declaration
18377 flag. It happens that GCC forgets to put it in sometimes, but
18378 only for functions, not for types.
18380 Adding more things than necessary to the hash table is harmless
18381 except for the performance cost. Adding too few will result in
18382 wasted time in find_partial_die, when we reread the compilation
18383 unit with load_all_dies set. */
18386 || abbrev->tag == DW_TAG_constant
18387 || abbrev->tag == DW_TAG_subprogram
18388 || abbrev->tag == DW_TAG_variable
18389 || abbrev->tag == DW_TAG_namespace
18390 || part_die->is_declaration)
18394 slot = htab_find_slot_with_hash (cu->partial_dies, part_die,
18395 to_underlying (part_die->sect_off),
18400 /* For some DIEs we want to follow their children (if any). For C
18401 we have no reason to follow the children of structures; for other
18402 languages we have to, so that we can get at method physnames
18403 to infer fully qualified class names, for DW_AT_specification,
18404 and for C++ template arguments. For C++, we also look one level
18405 inside functions to find template arguments (if the name of the
18406 function does not already contain the template arguments).
18408 For Ada, we need to scan the children of subprograms and lexical
18409 blocks as well because Ada allows the definition of nested
18410 entities that could be interesting for the debugger, such as
18411 nested subprograms for instance. */
18412 if (last_die->has_children
18414 || last_die->tag == DW_TAG_namespace
18415 || last_die->tag == DW_TAG_module
18416 || last_die->tag == DW_TAG_enumeration_type
18417 || (cu->language == language_cplus
18418 && last_die->tag == DW_TAG_subprogram
18419 && (last_die->name == NULL
18420 || strchr (last_die->name, '<') == NULL))
18421 || (cu->language != language_c
18422 && (last_die->tag == DW_TAG_class_type
18423 || last_die->tag == DW_TAG_interface_type
18424 || last_die->tag == DW_TAG_structure_type
18425 || last_die->tag == DW_TAG_union_type))
18426 || (cu->language == language_ada
18427 && (last_die->tag == DW_TAG_subprogram
18428 || last_die->tag == DW_TAG_lexical_block))))
18431 parent_die = last_die;
18435 /* Otherwise we skip to the next sibling, if any. */
18436 info_ptr = locate_pdi_sibling (reader, last_die, info_ptr);
18438 /* Back to the top, do it again. */
18442 partial_die_info::partial_die_info (sect_offset sect_off_,
18443 struct abbrev_info *abbrev)
18444 : partial_die_info (sect_off_, abbrev->tag, abbrev->has_children)
18448 /* Read a minimal amount of information into the minimal die structure.
18449 INFO_PTR should point just after the initial uleb128 of a DIE. */
18452 partial_die_info::read (const struct die_reader_specs *reader,
18453 const struct abbrev_info &abbrev, const gdb_byte *info_ptr)
18455 struct dwarf2_cu *cu = reader->cu;
18456 struct dwarf2_per_objfile *dwarf2_per_objfile
18457 = cu->per_cu->dwarf2_per_objfile;
18459 int has_low_pc_attr = 0;
18460 int has_high_pc_attr = 0;
18461 int high_pc_relative = 0;
18463 for (i = 0; i < abbrev.num_attrs; ++i)
18465 struct attribute attr;
18467 info_ptr = read_attribute (reader, &attr, &abbrev.attrs[i], info_ptr);
18469 /* Store the data if it is of an attribute we want to keep in a
18470 partial symbol table. */
18476 case DW_TAG_compile_unit:
18477 case DW_TAG_partial_unit:
18478 case DW_TAG_type_unit:
18479 /* Compilation units have a DW_AT_name that is a filename, not
18480 a source language identifier. */
18481 case DW_TAG_enumeration_type:
18482 case DW_TAG_enumerator:
18483 /* These tags always have simple identifiers already; no need
18484 to canonicalize them. */
18485 name = DW_STRING (&attr);
18489 struct objfile *objfile = dwarf2_per_objfile->objfile;
18492 = dwarf2_canonicalize_name (DW_STRING (&attr), cu,
18493 &objfile->per_bfd->storage_obstack);
18498 case DW_AT_linkage_name:
18499 case DW_AT_MIPS_linkage_name:
18500 /* Note that both forms of linkage name might appear. We
18501 assume they will be the same, and we only store the last
18503 if (cu->language == language_ada)
18504 name = DW_STRING (&attr);
18505 linkage_name = DW_STRING (&attr);
18508 has_low_pc_attr = 1;
18509 lowpc = attr_value_as_address (&attr);
18511 case DW_AT_high_pc:
18512 has_high_pc_attr = 1;
18513 highpc = attr_value_as_address (&attr);
18514 if (cu->header.version >= 4 && attr_form_is_constant (&attr))
18515 high_pc_relative = 1;
18517 case DW_AT_location:
18518 /* Support the .debug_loc offsets. */
18519 if (attr_form_is_block (&attr))
18521 d.locdesc = DW_BLOCK (&attr);
18523 else if (attr_form_is_section_offset (&attr))
18525 dwarf2_complex_location_expr_complaint ();
18529 dwarf2_invalid_attrib_class_complaint ("DW_AT_location",
18530 "partial symbol information");
18533 case DW_AT_external:
18534 is_external = DW_UNSND (&attr);
18536 case DW_AT_declaration:
18537 is_declaration = DW_UNSND (&attr);
18542 case DW_AT_abstract_origin:
18543 case DW_AT_specification:
18544 case DW_AT_extension:
18545 has_specification = 1;
18546 spec_offset = dwarf2_get_ref_die_offset (&attr);
18547 spec_is_dwz = (attr.form == DW_FORM_GNU_ref_alt
18548 || cu->per_cu->is_dwz);
18550 case DW_AT_sibling:
18551 /* Ignore absolute siblings, they might point outside of
18552 the current compile unit. */
18553 if (attr.form == DW_FORM_ref_addr)
18554 complaint (&symfile_complaints,
18555 _("ignoring absolute DW_AT_sibling"));
18558 const gdb_byte *buffer = reader->buffer;
18559 sect_offset off = dwarf2_get_ref_die_offset (&attr);
18560 const gdb_byte *sibling_ptr = buffer + to_underlying (off);
18562 if (sibling_ptr < info_ptr)
18563 complaint (&symfile_complaints,
18564 _("DW_AT_sibling points backwards"));
18565 else if (sibling_ptr > reader->buffer_end)
18566 dwarf2_section_buffer_overflow_complaint (reader->die_section);
18568 sibling = sibling_ptr;
18571 case DW_AT_byte_size:
18574 case DW_AT_const_value:
18575 has_const_value = 1;
18577 case DW_AT_calling_convention:
18578 /* DWARF doesn't provide a way to identify a program's source-level
18579 entry point. DW_AT_calling_convention attributes are only meant
18580 to describe functions' calling conventions.
18582 However, because it's a necessary piece of information in
18583 Fortran, and before DWARF 4 DW_CC_program was the only
18584 piece of debugging information whose definition refers to
18585 a 'main program' at all, several compilers marked Fortran
18586 main programs with DW_CC_program --- even when those
18587 functions use the standard calling conventions.
18589 Although DWARF now specifies a way to provide this
18590 information, we support this practice for backward
18592 if (DW_UNSND (&attr) == DW_CC_program
18593 && cu->language == language_fortran)
18594 main_subprogram = 1;
18597 if (DW_UNSND (&attr) == DW_INL_inlined
18598 || DW_UNSND (&attr) == DW_INL_declared_inlined)
18599 may_be_inlined = 1;
18603 if (tag == DW_TAG_imported_unit)
18605 d.sect_off = dwarf2_get_ref_die_offset (&attr);
18606 is_dwz = (attr.form == DW_FORM_GNU_ref_alt
18607 || cu->per_cu->is_dwz);
18611 case DW_AT_main_subprogram:
18612 main_subprogram = DW_UNSND (&attr);
18620 if (high_pc_relative)
18623 if (has_low_pc_attr && has_high_pc_attr)
18625 /* When using the GNU linker, .gnu.linkonce. sections are used to
18626 eliminate duplicate copies of functions and vtables and such.
18627 The linker will arbitrarily choose one and discard the others.
18628 The AT_*_pc values for such functions refer to local labels in
18629 these sections. If the section from that file was discarded, the
18630 labels are not in the output, so the relocs get a value of 0.
18631 If this is a discarded function, mark the pc bounds as invalid,
18632 so that GDB will ignore it. */
18633 if (lowpc == 0 && !dwarf2_per_objfile->has_section_at_zero)
18635 struct objfile *objfile = dwarf2_per_objfile->objfile;
18636 struct gdbarch *gdbarch = get_objfile_arch (objfile);
18638 complaint (&symfile_complaints,
18639 _("DW_AT_low_pc %s is zero "
18640 "for DIE at %s [in module %s]"),
18641 paddress (gdbarch, lowpc),
18642 sect_offset_str (sect_off),
18643 objfile_name (objfile));
18645 /* dwarf2_get_pc_bounds has also the strict low < high requirement. */
18646 else if (lowpc >= highpc)
18648 struct objfile *objfile = dwarf2_per_objfile->objfile;
18649 struct gdbarch *gdbarch = get_objfile_arch (objfile);
18651 complaint (&symfile_complaints,
18652 _("DW_AT_low_pc %s is not < DW_AT_high_pc %s "
18653 "for DIE at %s [in module %s]"),
18654 paddress (gdbarch, lowpc),
18655 paddress (gdbarch, highpc),
18656 sect_offset_str (sect_off),
18657 objfile_name (objfile));
18666 /* Find a cached partial DIE at OFFSET in CU. */
18668 struct partial_die_info *
18669 dwarf2_cu::find_partial_die (sect_offset sect_off)
18671 struct partial_die_info *lookup_die = NULL;
18672 struct partial_die_info part_die (sect_off);
18674 lookup_die = ((struct partial_die_info *)
18675 htab_find_with_hash (partial_dies, &part_die,
18676 to_underlying (sect_off)));
18681 /* Find a partial DIE at OFFSET, which may or may not be in CU,
18682 except in the case of .debug_types DIEs which do not reference
18683 outside their CU (they do however referencing other types via
18684 DW_FORM_ref_sig8). */
18686 static struct partial_die_info *
18687 find_partial_die (sect_offset sect_off, int offset_in_dwz, struct dwarf2_cu *cu)
18689 struct dwarf2_per_objfile *dwarf2_per_objfile
18690 = cu->per_cu->dwarf2_per_objfile;
18691 struct objfile *objfile = dwarf2_per_objfile->objfile;
18692 struct dwarf2_per_cu_data *per_cu = NULL;
18693 struct partial_die_info *pd = NULL;
18695 if (offset_in_dwz == cu->per_cu->is_dwz
18696 && offset_in_cu_p (&cu->header, sect_off))
18698 pd = cu->find_partial_die (sect_off);
18701 /* We missed recording what we needed.
18702 Load all dies and try again. */
18703 per_cu = cu->per_cu;
18707 /* TUs don't reference other CUs/TUs (except via type signatures). */
18708 if (cu->per_cu->is_debug_types)
18710 error (_("Dwarf Error: Type Unit at offset %s contains"
18711 " external reference to offset %s [in module %s].\n"),
18712 sect_offset_str (cu->header.sect_off), sect_offset_str (sect_off),
18713 bfd_get_filename (objfile->obfd));
18715 per_cu = dwarf2_find_containing_comp_unit (sect_off, offset_in_dwz,
18716 dwarf2_per_objfile);
18718 if (per_cu->cu == NULL || per_cu->cu->partial_dies == NULL)
18719 load_partial_comp_unit (per_cu);
18721 per_cu->cu->last_used = 0;
18722 pd = per_cu->cu->find_partial_die (sect_off);
18725 /* If we didn't find it, and not all dies have been loaded,
18726 load them all and try again. */
18728 if (pd == NULL && per_cu->load_all_dies == 0)
18730 per_cu->load_all_dies = 1;
18732 /* This is nasty. When we reread the DIEs, somewhere up the call chain
18733 THIS_CU->cu may already be in use. So we can't just free it and
18734 replace its DIEs with the ones we read in. Instead, we leave those
18735 DIEs alone (which can still be in use, e.g. in scan_partial_symbols),
18736 and clobber THIS_CU->cu->partial_dies with the hash table for the new
18738 load_partial_comp_unit (per_cu);
18740 pd = per_cu->cu->find_partial_die (sect_off);
18744 internal_error (__FILE__, __LINE__,
18745 _("could not find partial DIE %s "
18746 "in cache [from module %s]\n"),
18747 sect_offset_str (sect_off), bfd_get_filename (objfile->obfd));
18751 /* See if we can figure out if the class lives in a namespace. We do
18752 this by looking for a member function; its demangled name will
18753 contain namespace info, if there is any. */
18756 guess_partial_die_structure_name (struct partial_die_info *struct_pdi,
18757 struct dwarf2_cu *cu)
18759 /* NOTE: carlton/2003-10-07: Getting the info this way changes
18760 what template types look like, because the demangler
18761 frequently doesn't give the same name as the debug info. We
18762 could fix this by only using the demangled name to get the
18763 prefix (but see comment in read_structure_type). */
18765 struct partial_die_info *real_pdi;
18766 struct partial_die_info *child_pdi;
18768 /* If this DIE (this DIE's specification, if any) has a parent, then
18769 we should not do this. We'll prepend the parent's fully qualified
18770 name when we create the partial symbol. */
18772 real_pdi = struct_pdi;
18773 while (real_pdi->has_specification)
18774 real_pdi = find_partial_die (real_pdi->spec_offset,
18775 real_pdi->spec_is_dwz, cu);
18777 if (real_pdi->die_parent != NULL)
18780 for (child_pdi = struct_pdi->die_child;
18782 child_pdi = child_pdi->die_sibling)
18784 if (child_pdi->tag == DW_TAG_subprogram
18785 && child_pdi->linkage_name != NULL)
18787 char *actual_class_name
18788 = language_class_name_from_physname (cu->language_defn,
18789 child_pdi->linkage_name);
18790 if (actual_class_name != NULL)
18792 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
18795 obstack_copy0 (&objfile->per_bfd->storage_obstack,
18797 strlen (actual_class_name)));
18798 xfree (actual_class_name);
18806 partial_die_info::fixup (struct dwarf2_cu *cu)
18808 /* Once we've fixed up a die, there's no point in doing so again.
18809 This also avoids a memory leak if we were to call
18810 guess_partial_die_structure_name multiple times. */
18814 /* If we found a reference attribute and the DIE has no name, try
18815 to find a name in the referred to DIE. */
18817 if (name == NULL && has_specification)
18819 struct partial_die_info *spec_die;
18821 spec_die = find_partial_die (spec_offset, spec_is_dwz, cu);
18823 spec_die->fixup (cu);
18825 if (spec_die->name)
18827 name = spec_die->name;
18829 /* Copy DW_AT_external attribute if it is set. */
18830 if (spec_die->is_external)
18831 is_external = spec_die->is_external;
18835 /* Set default names for some unnamed DIEs. */
18837 if (name == NULL && tag == DW_TAG_namespace)
18838 name = CP_ANONYMOUS_NAMESPACE_STR;
18840 /* If there is no parent die to provide a namespace, and there are
18841 children, see if we can determine the namespace from their linkage
18843 if (cu->language == language_cplus
18844 && !VEC_empty (dwarf2_section_info_def,
18845 cu->per_cu->dwarf2_per_objfile->types)
18846 && die_parent == NULL
18848 && (tag == DW_TAG_class_type
18849 || tag == DW_TAG_structure_type
18850 || tag == DW_TAG_union_type))
18851 guess_partial_die_structure_name (this, cu);
18853 /* GCC might emit a nameless struct or union that has a linkage
18854 name. See http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47510. */
18856 && (tag == DW_TAG_class_type
18857 || tag == DW_TAG_interface_type
18858 || tag == DW_TAG_structure_type
18859 || tag == DW_TAG_union_type)
18860 && linkage_name != NULL)
18864 demangled = gdb_demangle (linkage_name, DMGL_TYPES);
18869 /* Strip any leading namespaces/classes, keep only the base name.
18870 DW_AT_name for named DIEs does not contain the prefixes. */
18871 base = strrchr (demangled, ':');
18872 if (base && base > demangled && base[-1] == ':')
18877 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
18880 obstack_copy0 (&objfile->per_bfd->storage_obstack,
18881 base, strlen (base)));
18889 /* Read an attribute value described by an attribute form. */
18891 static const gdb_byte *
18892 read_attribute_value (const struct die_reader_specs *reader,
18893 struct attribute *attr, unsigned form,
18894 LONGEST implicit_const, const gdb_byte *info_ptr)
18896 struct dwarf2_cu *cu = reader->cu;
18897 struct dwarf2_per_objfile *dwarf2_per_objfile
18898 = cu->per_cu->dwarf2_per_objfile;
18899 struct objfile *objfile = dwarf2_per_objfile->objfile;
18900 struct gdbarch *gdbarch = get_objfile_arch (objfile);
18901 bfd *abfd = reader->abfd;
18902 struct comp_unit_head *cu_header = &cu->header;
18903 unsigned int bytes_read;
18904 struct dwarf_block *blk;
18906 attr->form = (enum dwarf_form) form;
18909 case DW_FORM_ref_addr:
18910 if (cu->header.version == 2)
18911 DW_UNSND (attr) = read_address (abfd, info_ptr, cu, &bytes_read);
18913 DW_UNSND (attr) = read_offset (abfd, info_ptr,
18914 &cu->header, &bytes_read);
18915 info_ptr += bytes_read;
18917 case DW_FORM_GNU_ref_alt:
18918 DW_UNSND (attr) = read_offset (abfd, info_ptr, &cu->header, &bytes_read);
18919 info_ptr += bytes_read;
18922 DW_ADDR (attr) = read_address (abfd, info_ptr, cu, &bytes_read);
18923 DW_ADDR (attr) = gdbarch_adjust_dwarf2_addr (gdbarch, DW_ADDR (attr));
18924 info_ptr += bytes_read;
18926 case DW_FORM_block2:
18927 blk = dwarf_alloc_block (cu);
18928 blk->size = read_2_bytes (abfd, info_ptr);
18930 blk->data = read_n_bytes (abfd, info_ptr, blk->size);
18931 info_ptr += blk->size;
18932 DW_BLOCK (attr) = blk;
18934 case DW_FORM_block4:
18935 blk = dwarf_alloc_block (cu);
18936 blk->size = read_4_bytes (abfd, info_ptr);
18938 blk->data = read_n_bytes (abfd, info_ptr, blk->size);
18939 info_ptr += blk->size;
18940 DW_BLOCK (attr) = blk;
18942 case DW_FORM_data2:
18943 DW_UNSND (attr) = read_2_bytes (abfd, info_ptr);
18946 case DW_FORM_data4:
18947 DW_UNSND (attr) = read_4_bytes (abfd, info_ptr);
18950 case DW_FORM_data8:
18951 DW_UNSND (attr) = read_8_bytes (abfd, info_ptr);
18954 case DW_FORM_data16:
18955 blk = dwarf_alloc_block (cu);
18957 blk->data = read_n_bytes (abfd, info_ptr, 16);
18959 DW_BLOCK (attr) = blk;
18961 case DW_FORM_sec_offset:
18962 DW_UNSND (attr) = read_offset (abfd, info_ptr, &cu->header, &bytes_read);
18963 info_ptr += bytes_read;
18965 case DW_FORM_string:
18966 DW_STRING (attr) = read_direct_string (abfd, info_ptr, &bytes_read);
18967 DW_STRING_IS_CANONICAL (attr) = 0;
18968 info_ptr += bytes_read;
18971 if (!cu->per_cu->is_dwz)
18973 DW_STRING (attr) = read_indirect_string (dwarf2_per_objfile,
18974 abfd, info_ptr, cu_header,
18976 DW_STRING_IS_CANONICAL (attr) = 0;
18977 info_ptr += bytes_read;
18981 case DW_FORM_line_strp:
18982 if (!cu->per_cu->is_dwz)
18984 DW_STRING (attr) = read_indirect_line_string (dwarf2_per_objfile,
18986 cu_header, &bytes_read);
18987 DW_STRING_IS_CANONICAL (attr) = 0;
18988 info_ptr += bytes_read;
18992 case DW_FORM_GNU_strp_alt:
18994 struct dwz_file *dwz = dwarf2_get_dwz_file (dwarf2_per_objfile);
18995 LONGEST str_offset = read_offset (abfd, info_ptr, cu_header,
18998 DW_STRING (attr) = read_indirect_string_from_dwz (objfile,
19000 DW_STRING_IS_CANONICAL (attr) = 0;
19001 info_ptr += bytes_read;
19004 case DW_FORM_exprloc:
19005 case DW_FORM_block:
19006 blk = dwarf_alloc_block (cu);
19007 blk->size = read_unsigned_leb128 (abfd, info_ptr, &bytes_read);
19008 info_ptr += bytes_read;
19009 blk->data = read_n_bytes (abfd, info_ptr, blk->size);
19010 info_ptr += blk->size;
19011 DW_BLOCK (attr) = blk;
19013 case DW_FORM_block1:
19014 blk = dwarf_alloc_block (cu);
19015 blk->size = read_1_byte (abfd, info_ptr);
19017 blk->data = read_n_bytes (abfd, info_ptr, blk->size);
19018 info_ptr += blk->size;
19019 DW_BLOCK (attr) = blk;
19021 case DW_FORM_data1:
19022 DW_UNSND (attr) = read_1_byte (abfd, info_ptr);
19026 DW_UNSND (attr) = read_1_byte (abfd, info_ptr);
19029 case DW_FORM_flag_present:
19030 DW_UNSND (attr) = 1;
19032 case DW_FORM_sdata:
19033 DW_SND (attr) = read_signed_leb128 (abfd, info_ptr, &bytes_read);
19034 info_ptr += bytes_read;
19036 case DW_FORM_udata:
19037 DW_UNSND (attr) = read_unsigned_leb128 (abfd, info_ptr, &bytes_read);
19038 info_ptr += bytes_read;
19041 DW_UNSND (attr) = (to_underlying (cu->header.sect_off)
19042 + read_1_byte (abfd, info_ptr));
19046 DW_UNSND (attr) = (to_underlying (cu->header.sect_off)
19047 + read_2_bytes (abfd, info_ptr));
19051 DW_UNSND (attr) = (to_underlying (cu->header.sect_off)
19052 + read_4_bytes (abfd, info_ptr));
19056 DW_UNSND (attr) = (to_underlying (cu->header.sect_off)
19057 + read_8_bytes (abfd, info_ptr));
19060 case DW_FORM_ref_sig8:
19061 DW_SIGNATURE (attr) = read_8_bytes (abfd, info_ptr);
19064 case DW_FORM_ref_udata:
19065 DW_UNSND (attr) = (to_underlying (cu->header.sect_off)
19066 + read_unsigned_leb128 (abfd, info_ptr, &bytes_read));
19067 info_ptr += bytes_read;
19069 case DW_FORM_indirect:
19070 form = read_unsigned_leb128 (abfd, info_ptr, &bytes_read);
19071 info_ptr += bytes_read;
19072 if (form == DW_FORM_implicit_const)
19074 implicit_const = read_signed_leb128 (abfd, info_ptr, &bytes_read);
19075 info_ptr += bytes_read;
19077 info_ptr = read_attribute_value (reader, attr, form, implicit_const,
19080 case DW_FORM_implicit_const:
19081 DW_SND (attr) = implicit_const;
19083 case DW_FORM_GNU_addr_index:
19084 if (reader->dwo_file == NULL)
19086 /* For now flag a hard error.
19087 Later we can turn this into a complaint. */
19088 error (_("Dwarf Error: %s found in non-DWO CU [in module %s]"),
19089 dwarf_form_name (form),
19090 bfd_get_filename (abfd));
19092 DW_ADDR (attr) = read_addr_index_from_leb128 (cu, info_ptr, &bytes_read);
19093 info_ptr += bytes_read;
19095 case DW_FORM_GNU_str_index:
19096 if (reader->dwo_file == NULL)
19098 /* For now flag a hard error.
19099 Later we can turn this into a complaint if warranted. */
19100 error (_("Dwarf Error: %s found in non-DWO CU [in module %s]"),
19101 dwarf_form_name (form),
19102 bfd_get_filename (abfd));
19105 ULONGEST str_index =
19106 read_unsigned_leb128 (abfd, info_ptr, &bytes_read);
19108 DW_STRING (attr) = read_str_index (reader, str_index);
19109 DW_STRING_IS_CANONICAL (attr) = 0;
19110 info_ptr += bytes_read;
19114 error (_("Dwarf Error: Cannot handle %s in DWARF reader [in module %s]"),
19115 dwarf_form_name (form),
19116 bfd_get_filename (abfd));
19120 if (cu->per_cu->is_dwz && attr_form_is_ref (attr))
19121 attr->form = DW_FORM_GNU_ref_alt;
19123 /* We have seen instances where the compiler tried to emit a byte
19124 size attribute of -1 which ended up being encoded as an unsigned
19125 0xffffffff. Although 0xffffffff is technically a valid size value,
19126 an object of this size seems pretty unlikely so we can relatively
19127 safely treat these cases as if the size attribute was invalid and
19128 treat them as zero by default. */
19129 if (attr->name == DW_AT_byte_size
19130 && form == DW_FORM_data4
19131 && DW_UNSND (attr) >= 0xffffffff)
19134 (&symfile_complaints,
19135 _("Suspicious DW_AT_byte_size value treated as zero instead of %s"),
19136 hex_string (DW_UNSND (attr)));
19137 DW_UNSND (attr) = 0;
19143 /* Read an attribute described by an abbreviated attribute. */
19145 static const gdb_byte *
19146 read_attribute (const struct die_reader_specs *reader,
19147 struct attribute *attr, struct attr_abbrev *abbrev,
19148 const gdb_byte *info_ptr)
19150 attr->name = abbrev->name;
19151 return read_attribute_value (reader, attr, abbrev->form,
19152 abbrev->implicit_const, info_ptr);
19155 /* Read dwarf information from a buffer. */
19157 static unsigned int
19158 read_1_byte (bfd *abfd, const gdb_byte *buf)
19160 return bfd_get_8 (abfd, buf);
19164 read_1_signed_byte (bfd *abfd, const gdb_byte *buf)
19166 return bfd_get_signed_8 (abfd, buf);
19169 static unsigned int
19170 read_2_bytes (bfd *abfd, const gdb_byte *buf)
19172 return bfd_get_16 (abfd, buf);
19176 read_2_signed_bytes (bfd *abfd, const gdb_byte *buf)
19178 return bfd_get_signed_16 (abfd, buf);
19181 static unsigned int
19182 read_4_bytes (bfd *abfd, const gdb_byte *buf)
19184 return bfd_get_32 (abfd, buf);
19188 read_4_signed_bytes (bfd *abfd, const gdb_byte *buf)
19190 return bfd_get_signed_32 (abfd, buf);
19194 read_8_bytes (bfd *abfd, const gdb_byte *buf)
19196 return bfd_get_64 (abfd, buf);
19200 read_address (bfd *abfd, const gdb_byte *buf, struct dwarf2_cu *cu,
19201 unsigned int *bytes_read)
19203 struct comp_unit_head *cu_header = &cu->header;
19204 CORE_ADDR retval = 0;
19206 if (cu_header->signed_addr_p)
19208 switch (cu_header->addr_size)
19211 retval = bfd_get_signed_16 (abfd, buf);
19214 retval = bfd_get_signed_32 (abfd, buf);
19217 retval = bfd_get_signed_64 (abfd, buf);
19220 internal_error (__FILE__, __LINE__,
19221 _("read_address: bad switch, signed [in module %s]"),
19222 bfd_get_filename (abfd));
19227 switch (cu_header->addr_size)
19230 retval = bfd_get_16 (abfd, buf);
19233 retval = bfd_get_32 (abfd, buf);
19236 retval = bfd_get_64 (abfd, buf);
19239 internal_error (__FILE__, __LINE__,
19240 _("read_address: bad switch, "
19241 "unsigned [in module %s]"),
19242 bfd_get_filename (abfd));
19246 *bytes_read = cu_header->addr_size;
19250 /* Read the initial length from a section. The (draft) DWARF 3
19251 specification allows the initial length to take up either 4 bytes
19252 or 12 bytes. If the first 4 bytes are 0xffffffff, then the next 8
19253 bytes describe the length and all offsets will be 8 bytes in length
19256 An older, non-standard 64-bit format is also handled by this
19257 function. The older format in question stores the initial length
19258 as an 8-byte quantity without an escape value. Lengths greater
19259 than 2^32 aren't very common which means that the initial 4 bytes
19260 is almost always zero. Since a length value of zero doesn't make
19261 sense for the 32-bit format, this initial zero can be considered to
19262 be an escape value which indicates the presence of the older 64-bit
19263 format. As written, the code can't detect (old format) lengths
19264 greater than 4GB. If it becomes necessary to handle lengths
19265 somewhat larger than 4GB, we could allow other small values (such
19266 as the non-sensical values of 1, 2, and 3) to also be used as
19267 escape values indicating the presence of the old format.
19269 The value returned via bytes_read should be used to increment the
19270 relevant pointer after calling read_initial_length().
19272 [ Note: read_initial_length() and read_offset() are based on the
19273 document entitled "DWARF Debugging Information Format", revision
19274 3, draft 8, dated November 19, 2001. This document was obtained
19277 http://reality.sgiweb.org/davea/dwarf3-draft8-011125.pdf
19279 This document is only a draft and is subject to change. (So beware.)
19281 Details regarding the older, non-standard 64-bit format were
19282 determined empirically by examining 64-bit ELF files produced by
19283 the SGI toolchain on an IRIX 6.5 machine.
19285 - Kevin, July 16, 2002
19289 read_initial_length (bfd *abfd, const gdb_byte *buf, unsigned int *bytes_read)
19291 LONGEST length = bfd_get_32 (abfd, buf);
19293 if (length == 0xffffffff)
19295 length = bfd_get_64 (abfd, buf + 4);
19298 else if (length == 0)
19300 /* Handle the (non-standard) 64-bit DWARF2 format used by IRIX. */
19301 length = bfd_get_64 (abfd, buf);
19312 /* Cover function for read_initial_length.
19313 Returns the length of the object at BUF, and stores the size of the
19314 initial length in *BYTES_READ and stores the size that offsets will be in
19316 If the initial length size is not equivalent to that specified in
19317 CU_HEADER then issue a complaint.
19318 This is useful when reading non-comp-unit headers. */
19321 read_checked_initial_length_and_offset (bfd *abfd, const gdb_byte *buf,
19322 const struct comp_unit_head *cu_header,
19323 unsigned int *bytes_read,
19324 unsigned int *offset_size)
19326 LONGEST length = read_initial_length (abfd, buf, bytes_read);
19328 gdb_assert (cu_header->initial_length_size == 4
19329 || cu_header->initial_length_size == 8
19330 || cu_header->initial_length_size == 12);
19332 if (cu_header->initial_length_size != *bytes_read)
19333 complaint (&symfile_complaints,
19334 _("intermixed 32-bit and 64-bit DWARF sections"));
19336 *offset_size = (*bytes_read == 4) ? 4 : 8;
19340 /* Read an offset from the data stream. The size of the offset is
19341 given by cu_header->offset_size. */
19344 read_offset (bfd *abfd, const gdb_byte *buf,
19345 const struct comp_unit_head *cu_header,
19346 unsigned int *bytes_read)
19348 LONGEST offset = read_offset_1 (abfd, buf, cu_header->offset_size);
19350 *bytes_read = cu_header->offset_size;
19354 /* Read an offset from the data stream. */
19357 read_offset_1 (bfd *abfd, const gdb_byte *buf, unsigned int offset_size)
19359 LONGEST retval = 0;
19361 switch (offset_size)
19364 retval = bfd_get_32 (abfd, buf);
19367 retval = bfd_get_64 (abfd, buf);
19370 internal_error (__FILE__, __LINE__,
19371 _("read_offset_1: bad switch [in module %s]"),
19372 bfd_get_filename (abfd));
19378 static const gdb_byte *
19379 read_n_bytes (bfd *abfd, const gdb_byte *buf, unsigned int size)
19381 /* If the size of a host char is 8 bits, we can return a pointer
19382 to the buffer, otherwise we have to copy the data to a buffer
19383 allocated on the temporary obstack. */
19384 gdb_assert (HOST_CHAR_BIT == 8);
19388 static const char *
19389 read_direct_string (bfd *abfd, const gdb_byte *buf,
19390 unsigned int *bytes_read_ptr)
19392 /* If the size of a host char is 8 bits, we can return a pointer
19393 to the string, otherwise we have to copy the string to a buffer
19394 allocated on the temporary obstack. */
19395 gdb_assert (HOST_CHAR_BIT == 8);
19398 *bytes_read_ptr = 1;
19401 *bytes_read_ptr = strlen ((const char *) buf) + 1;
19402 return (const char *) buf;
19405 /* Return pointer to string at section SECT offset STR_OFFSET with error
19406 reporting strings FORM_NAME and SECT_NAME. */
19408 static const char *
19409 read_indirect_string_at_offset_from (struct objfile *objfile,
19410 bfd *abfd, LONGEST str_offset,
19411 struct dwarf2_section_info *sect,
19412 const char *form_name,
19413 const char *sect_name)
19415 dwarf2_read_section (objfile, sect);
19416 if (sect->buffer == NULL)
19417 error (_("%s used without %s section [in module %s]"),
19418 form_name, sect_name, bfd_get_filename (abfd));
19419 if (str_offset >= sect->size)
19420 error (_("%s pointing outside of %s section [in module %s]"),
19421 form_name, sect_name, bfd_get_filename (abfd));
19422 gdb_assert (HOST_CHAR_BIT == 8);
19423 if (sect->buffer[str_offset] == '\0')
19425 return (const char *) (sect->buffer + str_offset);
19428 /* Return pointer to string at .debug_str offset STR_OFFSET. */
19430 static const char *
19431 read_indirect_string_at_offset (struct dwarf2_per_objfile *dwarf2_per_objfile,
19432 bfd *abfd, LONGEST str_offset)
19434 return read_indirect_string_at_offset_from (dwarf2_per_objfile->objfile,
19436 &dwarf2_per_objfile->str,
19437 "DW_FORM_strp", ".debug_str");
19440 /* Return pointer to string at .debug_line_str offset STR_OFFSET. */
19442 static const char *
19443 read_indirect_line_string_at_offset (struct dwarf2_per_objfile *dwarf2_per_objfile,
19444 bfd *abfd, LONGEST str_offset)
19446 return read_indirect_string_at_offset_from (dwarf2_per_objfile->objfile,
19448 &dwarf2_per_objfile->line_str,
19449 "DW_FORM_line_strp",
19450 ".debug_line_str");
19453 /* Read a string at offset STR_OFFSET in the .debug_str section from
19454 the .dwz file DWZ. Throw an error if the offset is too large. If
19455 the string consists of a single NUL byte, return NULL; otherwise
19456 return a pointer to the string. */
19458 static const char *
19459 read_indirect_string_from_dwz (struct objfile *objfile, struct dwz_file *dwz,
19460 LONGEST str_offset)
19462 dwarf2_read_section (objfile, &dwz->str);
19464 if (dwz->str.buffer == NULL)
19465 error (_("DW_FORM_GNU_strp_alt used without .debug_str "
19466 "section [in module %s]"),
19467 bfd_get_filename (dwz->dwz_bfd));
19468 if (str_offset >= dwz->str.size)
19469 error (_("DW_FORM_GNU_strp_alt pointing outside of "
19470 ".debug_str section [in module %s]"),
19471 bfd_get_filename (dwz->dwz_bfd));
19472 gdb_assert (HOST_CHAR_BIT == 8);
19473 if (dwz->str.buffer[str_offset] == '\0')
19475 return (const char *) (dwz->str.buffer + str_offset);
19478 /* Return pointer to string at .debug_str offset as read from BUF.
19479 BUF is assumed to be in a compilation unit described by CU_HEADER.
19480 Return *BYTES_READ_PTR count of bytes read from BUF. */
19482 static const char *
19483 read_indirect_string (struct dwarf2_per_objfile *dwarf2_per_objfile, bfd *abfd,
19484 const gdb_byte *buf,
19485 const struct comp_unit_head *cu_header,
19486 unsigned int *bytes_read_ptr)
19488 LONGEST str_offset = read_offset (abfd, buf, cu_header, bytes_read_ptr);
19490 return read_indirect_string_at_offset (dwarf2_per_objfile, abfd, str_offset);
19493 /* Return pointer to string at .debug_line_str offset as read from BUF.
19494 BUF is assumed to be in a compilation unit described by CU_HEADER.
19495 Return *BYTES_READ_PTR count of bytes read from BUF. */
19497 static const char *
19498 read_indirect_line_string (struct dwarf2_per_objfile *dwarf2_per_objfile,
19499 bfd *abfd, const gdb_byte *buf,
19500 const struct comp_unit_head *cu_header,
19501 unsigned int *bytes_read_ptr)
19503 LONGEST str_offset = read_offset (abfd, buf, cu_header, bytes_read_ptr);
19505 return read_indirect_line_string_at_offset (dwarf2_per_objfile, abfd,
19510 read_unsigned_leb128 (bfd *abfd, const gdb_byte *buf,
19511 unsigned int *bytes_read_ptr)
19514 unsigned int num_read;
19516 unsigned char byte;
19523 byte = bfd_get_8 (abfd, buf);
19526 result |= ((ULONGEST) (byte & 127) << shift);
19527 if ((byte & 128) == 0)
19533 *bytes_read_ptr = num_read;
19538 read_signed_leb128 (bfd *abfd, const gdb_byte *buf,
19539 unsigned int *bytes_read_ptr)
19542 int shift, num_read;
19543 unsigned char byte;
19550 byte = bfd_get_8 (abfd, buf);
19553 result |= ((LONGEST) (byte & 127) << shift);
19555 if ((byte & 128) == 0)
19560 if ((shift < 8 * sizeof (result)) && (byte & 0x40))
19561 result |= -(((LONGEST) 1) << shift);
19562 *bytes_read_ptr = num_read;
19566 /* Given index ADDR_INDEX in .debug_addr, fetch the value.
19567 ADDR_BASE is the DW_AT_GNU_addr_base attribute or zero.
19568 ADDR_SIZE is the size of addresses from the CU header. */
19571 read_addr_index_1 (struct dwarf2_per_objfile *dwarf2_per_objfile,
19572 unsigned int addr_index, ULONGEST addr_base, int addr_size)
19574 struct objfile *objfile = dwarf2_per_objfile->objfile;
19575 bfd *abfd = objfile->obfd;
19576 const gdb_byte *info_ptr;
19578 dwarf2_read_section (objfile, &dwarf2_per_objfile->addr);
19579 if (dwarf2_per_objfile->addr.buffer == NULL)
19580 error (_("DW_FORM_addr_index used without .debug_addr section [in module %s]"),
19581 objfile_name (objfile));
19582 if (addr_base + addr_index * addr_size >= dwarf2_per_objfile->addr.size)
19583 error (_("DW_FORM_addr_index pointing outside of "
19584 ".debug_addr section [in module %s]"),
19585 objfile_name (objfile));
19586 info_ptr = (dwarf2_per_objfile->addr.buffer
19587 + addr_base + addr_index * addr_size);
19588 if (addr_size == 4)
19589 return bfd_get_32 (abfd, info_ptr);
19591 return bfd_get_64 (abfd, info_ptr);
19594 /* Given index ADDR_INDEX in .debug_addr, fetch the value. */
19597 read_addr_index (struct dwarf2_cu *cu, unsigned int addr_index)
19599 return read_addr_index_1 (cu->per_cu->dwarf2_per_objfile, addr_index,
19600 cu->addr_base, cu->header.addr_size);
19603 /* Given a pointer to an leb128 value, fetch the value from .debug_addr. */
19606 read_addr_index_from_leb128 (struct dwarf2_cu *cu, const gdb_byte *info_ptr,
19607 unsigned int *bytes_read)
19609 bfd *abfd = cu->per_cu->dwarf2_per_objfile->objfile->obfd;
19610 unsigned int addr_index = read_unsigned_leb128 (abfd, info_ptr, bytes_read);
19612 return read_addr_index (cu, addr_index);
19615 /* Data structure to pass results from dwarf2_read_addr_index_reader
19616 back to dwarf2_read_addr_index. */
19618 struct dwarf2_read_addr_index_data
19620 ULONGEST addr_base;
19624 /* die_reader_func for dwarf2_read_addr_index. */
19627 dwarf2_read_addr_index_reader (const struct die_reader_specs *reader,
19628 const gdb_byte *info_ptr,
19629 struct die_info *comp_unit_die,
19633 struct dwarf2_cu *cu = reader->cu;
19634 struct dwarf2_read_addr_index_data *aidata =
19635 (struct dwarf2_read_addr_index_data *) data;
19637 aidata->addr_base = cu->addr_base;
19638 aidata->addr_size = cu->header.addr_size;
19641 /* Given an index in .debug_addr, fetch the value.
19642 NOTE: This can be called during dwarf expression evaluation,
19643 long after the debug information has been read, and thus per_cu->cu
19644 may no longer exist. */
19647 dwarf2_read_addr_index (struct dwarf2_per_cu_data *per_cu,
19648 unsigned int addr_index)
19650 struct dwarf2_per_objfile *dwarf2_per_objfile = per_cu->dwarf2_per_objfile;
19651 struct dwarf2_cu *cu = per_cu->cu;
19652 ULONGEST addr_base;
19655 /* We need addr_base and addr_size.
19656 If we don't have PER_CU->cu, we have to get it.
19657 Nasty, but the alternative is storing the needed info in PER_CU,
19658 which at this point doesn't seem justified: it's not clear how frequently
19659 it would get used and it would increase the size of every PER_CU.
19660 Entry points like dwarf2_per_cu_addr_size do a similar thing
19661 so we're not in uncharted territory here.
19662 Alas we need to be a bit more complicated as addr_base is contained
19665 We don't need to read the entire CU(/TU).
19666 We just need the header and top level die.
19668 IWBN to use the aging mechanism to let us lazily later discard the CU.
19669 For now we skip this optimization. */
19673 addr_base = cu->addr_base;
19674 addr_size = cu->header.addr_size;
19678 struct dwarf2_read_addr_index_data aidata;
19680 /* Note: We can't use init_cutu_and_read_dies_simple here,
19681 we need addr_base. */
19682 init_cutu_and_read_dies (per_cu, NULL, 0, 0, false,
19683 dwarf2_read_addr_index_reader, &aidata);
19684 addr_base = aidata.addr_base;
19685 addr_size = aidata.addr_size;
19688 return read_addr_index_1 (dwarf2_per_objfile, addr_index, addr_base,
19692 /* Given a DW_FORM_GNU_str_index, fetch the string.
19693 This is only used by the Fission support. */
19695 static const char *
19696 read_str_index (const struct die_reader_specs *reader, ULONGEST str_index)
19698 struct dwarf2_cu *cu = reader->cu;
19699 struct dwarf2_per_objfile *dwarf2_per_objfile
19700 = cu->per_cu->dwarf2_per_objfile;
19701 struct objfile *objfile = dwarf2_per_objfile->objfile;
19702 const char *objf_name = objfile_name (objfile);
19703 bfd *abfd = objfile->obfd;
19704 struct dwarf2_section_info *str_section = &reader->dwo_file->sections.str;
19705 struct dwarf2_section_info *str_offsets_section =
19706 &reader->dwo_file->sections.str_offsets;
19707 const gdb_byte *info_ptr;
19708 ULONGEST str_offset;
19709 static const char form_name[] = "DW_FORM_GNU_str_index";
19711 dwarf2_read_section (objfile, str_section);
19712 dwarf2_read_section (objfile, str_offsets_section);
19713 if (str_section->buffer == NULL)
19714 error (_("%s used without .debug_str.dwo section"
19715 " in CU at offset %s [in module %s]"),
19716 form_name, sect_offset_str (cu->header.sect_off), objf_name);
19717 if (str_offsets_section->buffer == NULL)
19718 error (_("%s used without .debug_str_offsets.dwo section"
19719 " in CU at offset %s [in module %s]"),
19720 form_name, sect_offset_str (cu->header.sect_off), objf_name);
19721 if (str_index * cu->header.offset_size >= str_offsets_section->size)
19722 error (_("%s pointing outside of .debug_str_offsets.dwo"
19723 " section in CU at offset %s [in module %s]"),
19724 form_name, sect_offset_str (cu->header.sect_off), objf_name);
19725 info_ptr = (str_offsets_section->buffer
19726 + str_index * cu->header.offset_size);
19727 if (cu->header.offset_size == 4)
19728 str_offset = bfd_get_32 (abfd, info_ptr);
19730 str_offset = bfd_get_64 (abfd, info_ptr);
19731 if (str_offset >= str_section->size)
19732 error (_("Offset from %s pointing outside of"
19733 " .debug_str.dwo section in CU at offset %s [in module %s]"),
19734 form_name, sect_offset_str (cu->header.sect_off), objf_name);
19735 return (const char *) (str_section->buffer + str_offset);
19738 /* Return the length of an LEB128 number in BUF. */
19741 leb128_size (const gdb_byte *buf)
19743 const gdb_byte *begin = buf;
19749 if ((byte & 128) == 0)
19750 return buf - begin;
19755 set_cu_language (unsigned int lang, struct dwarf2_cu *cu)
19764 cu->language = language_c;
19767 case DW_LANG_C_plus_plus:
19768 case DW_LANG_C_plus_plus_11:
19769 case DW_LANG_C_plus_plus_14:
19770 cu->language = language_cplus;
19773 cu->language = language_d;
19775 case DW_LANG_Fortran77:
19776 case DW_LANG_Fortran90:
19777 case DW_LANG_Fortran95:
19778 case DW_LANG_Fortran03:
19779 case DW_LANG_Fortran08:
19780 cu->language = language_fortran;
19783 cu->language = language_go;
19785 case DW_LANG_Mips_Assembler:
19786 cu->language = language_asm;
19788 case DW_LANG_Ada83:
19789 case DW_LANG_Ada95:
19790 cu->language = language_ada;
19792 case DW_LANG_Modula2:
19793 cu->language = language_m2;
19795 case DW_LANG_Pascal83:
19796 cu->language = language_pascal;
19799 cu->language = language_objc;
19802 case DW_LANG_Rust_old:
19803 cu->language = language_rust;
19805 case DW_LANG_Cobol74:
19806 case DW_LANG_Cobol85:
19808 cu->language = language_minimal;
19811 cu->language_defn = language_def (cu->language);
19814 /* Return the named attribute or NULL if not there. */
19816 static struct attribute *
19817 dwarf2_attr (struct die_info *die, unsigned int name, struct dwarf2_cu *cu)
19822 struct attribute *spec = NULL;
19824 for (i = 0; i < die->num_attrs; ++i)
19826 if (die->attrs[i].name == name)
19827 return &die->attrs[i];
19828 if (die->attrs[i].name == DW_AT_specification
19829 || die->attrs[i].name == DW_AT_abstract_origin)
19830 spec = &die->attrs[i];
19836 die = follow_die_ref (die, spec, &cu);
19842 /* Return the named attribute or NULL if not there,
19843 but do not follow DW_AT_specification, etc.
19844 This is for use in contexts where we're reading .debug_types dies.
19845 Following DW_AT_specification, DW_AT_abstract_origin will take us
19846 back up the chain, and we want to go down. */
19848 static struct attribute *
19849 dwarf2_attr_no_follow (struct die_info *die, unsigned int name)
19853 for (i = 0; i < die->num_attrs; ++i)
19854 if (die->attrs[i].name == name)
19855 return &die->attrs[i];
19860 /* Return the string associated with a string-typed attribute, or NULL if it
19861 is either not found or is of an incorrect type. */
19863 static const char *
19864 dwarf2_string_attr (struct die_info *die, unsigned int name, struct dwarf2_cu *cu)
19866 struct attribute *attr;
19867 const char *str = NULL;
19869 attr = dwarf2_attr (die, name, cu);
19873 if (attr->form == DW_FORM_strp || attr->form == DW_FORM_line_strp
19874 || attr->form == DW_FORM_string
19875 || attr->form == DW_FORM_GNU_str_index
19876 || attr->form == DW_FORM_GNU_strp_alt)
19877 str = DW_STRING (attr);
19879 complaint (&symfile_complaints,
19880 _("string type expected for attribute %s for "
19881 "DIE at %s in module %s"),
19882 dwarf_attr_name (name), sect_offset_str (die->sect_off),
19883 objfile_name (cu->per_cu->dwarf2_per_objfile->objfile));
19889 /* Return non-zero iff the attribute NAME is defined for the given DIE,
19890 and holds a non-zero value. This function should only be used for
19891 DW_FORM_flag or DW_FORM_flag_present attributes. */
19894 dwarf2_flag_true_p (struct die_info *die, unsigned name, struct dwarf2_cu *cu)
19896 struct attribute *attr = dwarf2_attr (die, name, cu);
19898 return (attr && DW_UNSND (attr));
19902 die_is_declaration (struct die_info *die, struct dwarf2_cu *cu)
19904 /* A DIE is a declaration if it has a DW_AT_declaration attribute
19905 which value is non-zero. However, we have to be careful with
19906 DIEs having a DW_AT_specification attribute, because dwarf2_attr()
19907 (via dwarf2_flag_true_p) follows this attribute. So we may
19908 end up accidently finding a declaration attribute that belongs
19909 to a different DIE referenced by the specification attribute,
19910 even though the given DIE does not have a declaration attribute. */
19911 return (dwarf2_flag_true_p (die, DW_AT_declaration, cu)
19912 && dwarf2_attr (die, DW_AT_specification, cu) == NULL);
19915 /* Return the die giving the specification for DIE, if there is
19916 one. *SPEC_CU is the CU containing DIE on input, and the CU
19917 containing the return value on output. If there is no
19918 specification, but there is an abstract origin, that is
19921 static struct die_info *
19922 die_specification (struct die_info *die, struct dwarf2_cu **spec_cu)
19924 struct attribute *spec_attr = dwarf2_attr (die, DW_AT_specification,
19927 if (spec_attr == NULL)
19928 spec_attr = dwarf2_attr (die, DW_AT_abstract_origin, *spec_cu);
19930 if (spec_attr == NULL)
19933 return follow_die_ref (die, spec_attr, spec_cu);
19936 /* Stub for free_line_header to match void * callback types. */
19939 free_line_header_voidp (void *arg)
19941 struct line_header *lh = (struct line_header *) arg;
19947 line_header::add_include_dir (const char *include_dir)
19949 if (dwarf_line_debug >= 2)
19950 fprintf_unfiltered (gdb_stdlog, "Adding dir %zu: %s\n",
19951 include_dirs.size () + 1, include_dir);
19953 include_dirs.push_back (include_dir);
19957 line_header::add_file_name (const char *name,
19959 unsigned int mod_time,
19960 unsigned int length)
19962 if (dwarf_line_debug >= 2)
19963 fprintf_unfiltered (gdb_stdlog, "Adding file %u: %s\n",
19964 (unsigned) file_names.size () + 1, name);
19966 file_names.emplace_back (name, d_index, mod_time, length);
19969 /* A convenience function to find the proper .debug_line section for a CU. */
19971 static struct dwarf2_section_info *
19972 get_debug_line_section (struct dwarf2_cu *cu)
19974 struct dwarf2_section_info *section;
19975 struct dwarf2_per_objfile *dwarf2_per_objfile
19976 = cu->per_cu->dwarf2_per_objfile;
19978 /* For TUs in DWO files, the DW_AT_stmt_list attribute lives in the
19980 if (cu->dwo_unit && cu->per_cu->is_debug_types)
19981 section = &cu->dwo_unit->dwo_file->sections.line;
19982 else if (cu->per_cu->is_dwz)
19984 struct dwz_file *dwz = dwarf2_get_dwz_file (dwarf2_per_objfile);
19986 section = &dwz->line;
19989 section = &dwarf2_per_objfile->line;
19994 /* Read directory or file name entry format, starting with byte of
19995 format count entries, ULEB128 pairs of entry formats, ULEB128 of
19996 entries count and the entries themselves in the described entry
20000 read_formatted_entries (struct dwarf2_per_objfile *dwarf2_per_objfile,
20001 bfd *abfd, const gdb_byte **bufp,
20002 struct line_header *lh,
20003 const struct comp_unit_head *cu_header,
20004 void (*callback) (struct line_header *lh,
20007 unsigned int mod_time,
20008 unsigned int length))
20010 gdb_byte format_count, formati;
20011 ULONGEST data_count, datai;
20012 const gdb_byte *buf = *bufp;
20013 const gdb_byte *format_header_data;
20014 unsigned int bytes_read;
20016 format_count = read_1_byte (abfd, buf);
20018 format_header_data = buf;
20019 for (formati = 0; formati < format_count; formati++)
20021 read_unsigned_leb128 (abfd, buf, &bytes_read);
20023 read_unsigned_leb128 (abfd, buf, &bytes_read);
20027 data_count = read_unsigned_leb128 (abfd, buf, &bytes_read);
20029 for (datai = 0; datai < data_count; datai++)
20031 const gdb_byte *format = format_header_data;
20032 struct file_entry fe;
20034 for (formati = 0; formati < format_count; formati++)
20036 ULONGEST content_type = read_unsigned_leb128 (abfd, format, &bytes_read);
20037 format += bytes_read;
20039 ULONGEST form = read_unsigned_leb128 (abfd, format, &bytes_read);
20040 format += bytes_read;
20042 gdb::optional<const char *> string;
20043 gdb::optional<unsigned int> uint;
20047 case DW_FORM_string:
20048 string.emplace (read_direct_string (abfd, buf, &bytes_read));
20052 case DW_FORM_line_strp:
20053 string.emplace (read_indirect_line_string (dwarf2_per_objfile,
20060 case DW_FORM_data1:
20061 uint.emplace (read_1_byte (abfd, buf));
20065 case DW_FORM_data2:
20066 uint.emplace (read_2_bytes (abfd, buf));
20070 case DW_FORM_data4:
20071 uint.emplace (read_4_bytes (abfd, buf));
20075 case DW_FORM_data8:
20076 uint.emplace (read_8_bytes (abfd, buf));
20080 case DW_FORM_udata:
20081 uint.emplace (read_unsigned_leb128 (abfd, buf, &bytes_read));
20085 case DW_FORM_block:
20086 /* It is valid only for DW_LNCT_timestamp which is ignored by
20091 switch (content_type)
20094 if (string.has_value ())
20097 case DW_LNCT_directory_index:
20098 if (uint.has_value ())
20099 fe.d_index = (dir_index) *uint;
20101 case DW_LNCT_timestamp:
20102 if (uint.has_value ())
20103 fe.mod_time = *uint;
20106 if (uint.has_value ())
20112 complaint (&symfile_complaints,
20113 _("Unknown format content type %s"),
20114 pulongest (content_type));
20118 callback (lh, fe.name, fe.d_index, fe.mod_time, fe.length);
20124 /* Read the statement program header starting at OFFSET in
20125 .debug_line, or .debug_line.dwo. Return a pointer
20126 to a struct line_header, allocated using xmalloc.
20127 Returns NULL if there is a problem reading the header, e.g., if it
20128 has a version we don't understand.
20130 NOTE: the strings in the include directory and file name tables of
20131 the returned object point into the dwarf line section buffer,
20132 and must not be freed. */
20134 static line_header_up
20135 dwarf_decode_line_header (sect_offset sect_off, struct dwarf2_cu *cu)
20137 const gdb_byte *line_ptr;
20138 unsigned int bytes_read, offset_size;
20140 const char *cur_dir, *cur_file;
20141 struct dwarf2_section_info *section;
20143 struct dwarf2_per_objfile *dwarf2_per_objfile
20144 = cu->per_cu->dwarf2_per_objfile;
20146 section = get_debug_line_section (cu);
20147 dwarf2_read_section (dwarf2_per_objfile->objfile, section);
20148 if (section->buffer == NULL)
20150 if (cu->dwo_unit && cu->per_cu->is_debug_types)
20151 complaint (&symfile_complaints, _("missing .debug_line.dwo section"));
20153 complaint (&symfile_complaints, _("missing .debug_line section"));
20157 /* We can't do this until we know the section is non-empty.
20158 Only then do we know we have such a section. */
20159 abfd = get_section_bfd_owner (section);
20161 /* Make sure that at least there's room for the total_length field.
20162 That could be 12 bytes long, but we're just going to fudge that. */
20163 if (to_underlying (sect_off) + 4 >= section->size)
20165 dwarf2_statement_list_fits_in_line_number_section_complaint ();
20169 line_header_up lh (new line_header ());
20171 lh->sect_off = sect_off;
20172 lh->offset_in_dwz = cu->per_cu->is_dwz;
20174 line_ptr = section->buffer + to_underlying (sect_off);
20176 /* Read in the header. */
20178 read_checked_initial_length_and_offset (abfd, line_ptr, &cu->header,
20179 &bytes_read, &offset_size);
20180 line_ptr += bytes_read;
20181 if (line_ptr + lh->total_length > (section->buffer + section->size))
20183 dwarf2_statement_list_fits_in_line_number_section_complaint ();
20186 lh->statement_program_end = line_ptr + lh->total_length;
20187 lh->version = read_2_bytes (abfd, line_ptr);
20189 if (lh->version > 5)
20191 /* This is a version we don't understand. The format could have
20192 changed in ways we don't handle properly so just punt. */
20193 complaint (&symfile_complaints,
20194 _("unsupported version in .debug_line section"));
20197 if (lh->version >= 5)
20199 gdb_byte segment_selector_size;
20201 /* Skip address size. */
20202 read_1_byte (abfd, line_ptr);
20205 segment_selector_size = read_1_byte (abfd, line_ptr);
20207 if (segment_selector_size != 0)
20209 complaint (&symfile_complaints,
20210 _("unsupported segment selector size %u "
20211 "in .debug_line section"),
20212 segment_selector_size);
20216 lh->header_length = read_offset_1 (abfd, line_ptr, offset_size);
20217 line_ptr += offset_size;
20218 lh->minimum_instruction_length = read_1_byte (abfd, line_ptr);
20220 if (lh->version >= 4)
20222 lh->maximum_ops_per_instruction = read_1_byte (abfd, line_ptr);
20226 lh->maximum_ops_per_instruction = 1;
20228 if (lh->maximum_ops_per_instruction == 0)
20230 lh->maximum_ops_per_instruction = 1;
20231 complaint (&symfile_complaints,
20232 _("invalid maximum_ops_per_instruction "
20233 "in `.debug_line' section"));
20236 lh->default_is_stmt = read_1_byte (abfd, line_ptr);
20238 lh->line_base = read_1_signed_byte (abfd, line_ptr);
20240 lh->line_range = read_1_byte (abfd, line_ptr);
20242 lh->opcode_base = read_1_byte (abfd, line_ptr);
20244 lh->standard_opcode_lengths.reset (new unsigned char[lh->opcode_base]);
20246 lh->standard_opcode_lengths[0] = 1; /* This should never be used anyway. */
20247 for (i = 1; i < lh->opcode_base; ++i)
20249 lh->standard_opcode_lengths[i] = read_1_byte (abfd, line_ptr);
20253 if (lh->version >= 5)
20255 /* Read directory table. */
20256 read_formatted_entries (dwarf2_per_objfile, abfd, &line_ptr, lh.get (),
20258 [] (struct line_header *lh, const char *name,
20259 dir_index d_index, unsigned int mod_time,
20260 unsigned int length)
20262 lh->add_include_dir (name);
20265 /* Read file name table. */
20266 read_formatted_entries (dwarf2_per_objfile, abfd, &line_ptr, lh.get (),
20268 [] (struct line_header *lh, const char *name,
20269 dir_index d_index, unsigned int mod_time,
20270 unsigned int length)
20272 lh->add_file_name (name, d_index, mod_time, length);
20277 /* Read directory table. */
20278 while ((cur_dir = read_direct_string (abfd, line_ptr, &bytes_read)) != NULL)
20280 line_ptr += bytes_read;
20281 lh->add_include_dir (cur_dir);
20283 line_ptr += bytes_read;
20285 /* Read file name table. */
20286 while ((cur_file = read_direct_string (abfd, line_ptr, &bytes_read)) != NULL)
20288 unsigned int mod_time, length;
20291 line_ptr += bytes_read;
20292 d_index = (dir_index) read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
20293 line_ptr += bytes_read;
20294 mod_time = read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
20295 line_ptr += bytes_read;
20296 length = read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
20297 line_ptr += bytes_read;
20299 lh->add_file_name (cur_file, d_index, mod_time, length);
20301 line_ptr += bytes_read;
20303 lh->statement_program_start = line_ptr;
20305 if (line_ptr > (section->buffer + section->size))
20306 complaint (&symfile_complaints,
20307 _("line number info header doesn't "
20308 "fit in `.debug_line' section"));
20313 /* Subroutine of dwarf_decode_lines to simplify it.
20314 Return the file name of the psymtab for included file FILE_INDEX
20315 in line header LH of PST.
20316 COMP_DIR is the compilation directory (DW_AT_comp_dir) or NULL if unknown.
20317 If space for the result is malloc'd, *NAME_HOLDER will be set.
20318 Returns NULL if FILE_INDEX should be ignored, i.e., it is pst->filename. */
20320 static const char *
20321 psymtab_include_file_name (const struct line_header *lh, int file_index,
20322 const struct partial_symtab *pst,
20323 const char *comp_dir,
20324 gdb::unique_xmalloc_ptr<char> *name_holder)
20326 const file_entry &fe = lh->file_names[file_index];
20327 const char *include_name = fe.name;
20328 const char *include_name_to_compare = include_name;
20329 const char *pst_filename;
20332 const char *dir_name = fe.include_dir (lh);
20334 gdb::unique_xmalloc_ptr<char> hold_compare;
20335 if (!IS_ABSOLUTE_PATH (include_name)
20336 && (dir_name != NULL || comp_dir != NULL))
20338 /* Avoid creating a duplicate psymtab for PST.
20339 We do this by comparing INCLUDE_NAME and PST_FILENAME.
20340 Before we do the comparison, however, we need to account
20341 for DIR_NAME and COMP_DIR.
20342 First prepend dir_name (if non-NULL). If we still don't
20343 have an absolute path prepend comp_dir (if non-NULL).
20344 However, the directory we record in the include-file's
20345 psymtab does not contain COMP_DIR (to match the
20346 corresponding symtab(s)).
20351 bash$ gcc -g ./hello.c
20352 include_name = "hello.c"
20354 DW_AT_comp_dir = comp_dir = "/tmp"
20355 DW_AT_name = "./hello.c"
20359 if (dir_name != NULL)
20361 name_holder->reset (concat (dir_name, SLASH_STRING,
20362 include_name, (char *) NULL));
20363 include_name = name_holder->get ();
20364 include_name_to_compare = include_name;
20366 if (!IS_ABSOLUTE_PATH (include_name) && comp_dir != NULL)
20368 hold_compare.reset (concat (comp_dir, SLASH_STRING,
20369 include_name, (char *) NULL));
20370 include_name_to_compare = hold_compare.get ();
20374 pst_filename = pst->filename;
20375 gdb::unique_xmalloc_ptr<char> copied_name;
20376 if (!IS_ABSOLUTE_PATH (pst_filename) && pst->dirname != NULL)
20378 copied_name.reset (concat (pst->dirname, SLASH_STRING,
20379 pst_filename, (char *) NULL));
20380 pst_filename = copied_name.get ();
20383 file_is_pst = FILENAME_CMP (include_name_to_compare, pst_filename) == 0;
20387 return include_name;
20390 /* State machine to track the state of the line number program. */
20392 class lnp_state_machine
20395 /* Initialize a machine state for the start of a line number
20397 lnp_state_machine (gdbarch *arch, line_header *lh, bool record_lines_p);
20399 file_entry *current_file ()
20401 /* lh->file_names is 0-based, but the file name numbers in the
20402 statement program are 1-based. */
20403 return m_line_header->file_name_at (m_file);
20406 /* Record the line in the state machine. END_SEQUENCE is true if
20407 we're processing the end of a sequence. */
20408 void record_line (bool end_sequence);
20410 /* Check address and if invalid nop-out the rest of the lines in this
20412 void check_line_address (struct dwarf2_cu *cu,
20413 const gdb_byte *line_ptr,
20414 CORE_ADDR lowpc, CORE_ADDR address);
20416 void handle_set_discriminator (unsigned int discriminator)
20418 m_discriminator = discriminator;
20419 m_line_has_non_zero_discriminator |= discriminator != 0;
20422 /* Handle DW_LNE_set_address. */
20423 void handle_set_address (CORE_ADDR baseaddr, CORE_ADDR address)
20426 address += baseaddr;
20427 m_address = gdbarch_adjust_dwarf2_line (m_gdbarch, address, false);
20430 /* Handle DW_LNS_advance_pc. */
20431 void handle_advance_pc (CORE_ADDR adjust);
20433 /* Handle a special opcode. */
20434 void handle_special_opcode (unsigned char op_code);
20436 /* Handle DW_LNS_advance_line. */
20437 void handle_advance_line (int line_delta)
20439 advance_line (line_delta);
20442 /* Handle DW_LNS_set_file. */
20443 void handle_set_file (file_name_index file);
20445 /* Handle DW_LNS_negate_stmt. */
20446 void handle_negate_stmt ()
20448 m_is_stmt = !m_is_stmt;
20451 /* Handle DW_LNS_const_add_pc. */
20452 void handle_const_add_pc ();
20454 /* Handle DW_LNS_fixed_advance_pc. */
20455 void handle_fixed_advance_pc (CORE_ADDR addr_adj)
20457 m_address += gdbarch_adjust_dwarf2_line (m_gdbarch, addr_adj, true);
20461 /* Handle DW_LNS_copy. */
20462 void handle_copy ()
20464 record_line (false);
20465 m_discriminator = 0;
20468 /* Handle DW_LNE_end_sequence. */
20469 void handle_end_sequence ()
20471 m_record_line_callback = ::record_line;
20475 /* Advance the line by LINE_DELTA. */
20476 void advance_line (int line_delta)
20478 m_line += line_delta;
20480 if (line_delta != 0)
20481 m_line_has_non_zero_discriminator = m_discriminator != 0;
20484 gdbarch *m_gdbarch;
20486 /* True if we're recording lines.
20487 Otherwise we're building partial symtabs and are just interested in
20488 finding include files mentioned by the line number program. */
20489 bool m_record_lines_p;
20491 /* The line number header. */
20492 line_header *m_line_header;
20494 /* These are part of the standard DWARF line number state machine,
20495 and initialized according to the DWARF spec. */
20497 unsigned char m_op_index = 0;
20498 /* The line table index (1-based) of the current file. */
20499 file_name_index m_file = (file_name_index) 1;
20500 unsigned int m_line = 1;
20502 /* These are initialized in the constructor. */
20504 CORE_ADDR m_address;
20506 unsigned int m_discriminator;
20508 /* Additional bits of state we need to track. */
20510 /* The last file that we called dwarf2_start_subfile for.
20511 This is only used for TLLs. */
20512 unsigned int m_last_file = 0;
20513 /* The last file a line number was recorded for. */
20514 struct subfile *m_last_subfile = NULL;
20516 /* The function to call to record a line. */
20517 record_line_ftype *m_record_line_callback = NULL;
20519 /* The last line number that was recorded, used to coalesce
20520 consecutive entries for the same line. This can happen, for
20521 example, when discriminators are present. PR 17276. */
20522 unsigned int m_last_line = 0;
20523 bool m_line_has_non_zero_discriminator = false;
20527 lnp_state_machine::handle_advance_pc (CORE_ADDR adjust)
20529 CORE_ADDR addr_adj = (((m_op_index + adjust)
20530 / m_line_header->maximum_ops_per_instruction)
20531 * m_line_header->minimum_instruction_length);
20532 m_address += gdbarch_adjust_dwarf2_line (m_gdbarch, addr_adj, true);
20533 m_op_index = ((m_op_index + adjust)
20534 % m_line_header->maximum_ops_per_instruction);
20538 lnp_state_machine::handle_special_opcode (unsigned char op_code)
20540 unsigned char adj_opcode = op_code - m_line_header->opcode_base;
20541 CORE_ADDR addr_adj = (((m_op_index
20542 + (adj_opcode / m_line_header->line_range))
20543 / m_line_header->maximum_ops_per_instruction)
20544 * m_line_header->minimum_instruction_length);
20545 m_address += gdbarch_adjust_dwarf2_line (m_gdbarch, addr_adj, true);
20546 m_op_index = ((m_op_index + (adj_opcode / m_line_header->line_range))
20547 % m_line_header->maximum_ops_per_instruction);
20549 int line_delta = (m_line_header->line_base
20550 + (adj_opcode % m_line_header->line_range));
20551 advance_line (line_delta);
20552 record_line (false);
20553 m_discriminator = 0;
20557 lnp_state_machine::handle_set_file (file_name_index file)
20561 const file_entry *fe = current_file ();
20563 dwarf2_debug_line_missing_file_complaint ();
20564 else if (m_record_lines_p)
20566 const char *dir = fe->include_dir (m_line_header);
20568 m_last_subfile = current_subfile;
20569 m_line_has_non_zero_discriminator = m_discriminator != 0;
20570 dwarf2_start_subfile (fe->name, dir);
20575 lnp_state_machine::handle_const_add_pc ()
20578 = (255 - m_line_header->opcode_base) / m_line_header->line_range;
20581 = (((m_op_index + adjust)
20582 / m_line_header->maximum_ops_per_instruction)
20583 * m_line_header->minimum_instruction_length);
20585 m_address += gdbarch_adjust_dwarf2_line (m_gdbarch, addr_adj, true);
20586 m_op_index = ((m_op_index + adjust)
20587 % m_line_header->maximum_ops_per_instruction);
20590 /* Ignore this record_line request. */
20593 noop_record_line (struct subfile *subfile, int line, CORE_ADDR pc)
20598 /* Return non-zero if we should add LINE to the line number table.
20599 LINE is the line to add, LAST_LINE is the last line that was added,
20600 LAST_SUBFILE is the subfile for LAST_LINE.
20601 LINE_HAS_NON_ZERO_DISCRIMINATOR is non-zero if LINE has ever
20602 had a non-zero discriminator.
20604 We have to be careful in the presence of discriminators.
20605 E.g., for this line:
20607 for (i = 0; i < 100000; i++);
20609 clang can emit four line number entries for that one line,
20610 each with a different discriminator.
20611 See gdb.dwarf2/dw2-single-line-discriminators.exp for an example.
20613 However, we want gdb to coalesce all four entries into one.
20614 Otherwise the user could stepi into the middle of the line and
20615 gdb would get confused about whether the pc really was in the
20616 middle of the line.
20618 Things are further complicated by the fact that two consecutive
20619 line number entries for the same line is a heuristic used by gcc
20620 to denote the end of the prologue. So we can't just discard duplicate
20621 entries, we have to be selective about it. The heuristic we use is
20622 that we only collapse consecutive entries for the same line if at least
20623 one of those entries has a non-zero discriminator. PR 17276.
20625 Note: Addresses in the line number state machine can never go backwards
20626 within one sequence, thus this coalescing is ok. */
20629 dwarf_record_line_p (unsigned int line, unsigned int last_line,
20630 int line_has_non_zero_discriminator,
20631 struct subfile *last_subfile)
20633 if (current_subfile != last_subfile)
20635 if (line != last_line)
20637 /* Same line for the same file that we've seen already.
20638 As a last check, for pr 17276, only record the line if the line
20639 has never had a non-zero discriminator. */
20640 if (!line_has_non_zero_discriminator)
20645 /* Use P_RECORD_LINE to record line number LINE beginning at address ADDRESS
20646 in the line table of subfile SUBFILE. */
20649 dwarf_record_line_1 (struct gdbarch *gdbarch, struct subfile *subfile,
20650 unsigned int line, CORE_ADDR address,
20651 record_line_ftype p_record_line)
20653 CORE_ADDR addr = gdbarch_addr_bits_remove (gdbarch, address);
20655 if (dwarf_line_debug)
20657 fprintf_unfiltered (gdb_stdlog,
20658 "Recording line %u, file %s, address %s\n",
20659 line, lbasename (subfile->name),
20660 paddress (gdbarch, address));
20663 (*p_record_line) (subfile, line, addr);
20666 /* Subroutine of dwarf_decode_lines_1 to simplify it.
20667 Mark the end of a set of line number records.
20668 The arguments are the same as for dwarf_record_line_1.
20669 If SUBFILE is NULL the request is ignored. */
20672 dwarf_finish_line (struct gdbarch *gdbarch, struct subfile *subfile,
20673 CORE_ADDR address, record_line_ftype p_record_line)
20675 if (subfile == NULL)
20678 if (dwarf_line_debug)
20680 fprintf_unfiltered (gdb_stdlog,
20681 "Finishing current line, file %s, address %s\n",
20682 lbasename (subfile->name),
20683 paddress (gdbarch, address));
20686 dwarf_record_line_1 (gdbarch, subfile, 0, address, p_record_line);
20690 lnp_state_machine::record_line (bool end_sequence)
20692 if (dwarf_line_debug)
20694 fprintf_unfiltered (gdb_stdlog,
20695 "Processing actual line %u: file %u,"
20696 " address %s, is_stmt %u, discrim %u\n",
20697 m_line, to_underlying (m_file),
20698 paddress (m_gdbarch, m_address),
20699 m_is_stmt, m_discriminator);
20702 file_entry *fe = current_file ();
20705 dwarf2_debug_line_missing_file_complaint ();
20706 /* For now we ignore lines not starting on an instruction boundary.
20707 But not when processing end_sequence for compatibility with the
20708 previous version of the code. */
20709 else if (m_op_index == 0 || end_sequence)
20711 fe->included_p = 1;
20712 if (m_record_lines_p && m_is_stmt)
20714 if (m_last_subfile != current_subfile || end_sequence)
20716 dwarf_finish_line (m_gdbarch, m_last_subfile,
20717 m_address, m_record_line_callback);
20722 if (dwarf_record_line_p (m_line, m_last_line,
20723 m_line_has_non_zero_discriminator,
20726 dwarf_record_line_1 (m_gdbarch, current_subfile,
20728 m_record_line_callback);
20730 m_last_subfile = current_subfile;
20731 m_last_line = m_line;
20737 lnp_state_machine::lnp_state_machine (gdbarch *arch, line_header *lh,
20738 bool record_lines_p)
20741 m_record_lines_p = record_lines_p;
20742 m_line_header = lh;
20744 m_record_line_callback = ::record_line;
20746 /* Call `gdbarch_adjust_dwarf2_line' on the initial 0 address as if there
20747 was a line entry for it so that the backend has a chance to adjust it
20748 and also record it in case it needs it. This is currently used by MIPS
20749 code, cf. `mips_adjust_dwarf2_line'. */
20750 m_address = gdbarch_adjust_dwarf2_line (arch, 0, 0);
20751 m_is_stmt = lh->default_is_stmt;
20752 m_discriminator = 0;
20756 lnp_state_machine::check_line_address (struct dwarf2_cu *cu,
20757 const gdb_byte *line_ptr,
20758 CORE_ADDR lowpc, CORE_ADDR address)
20760 /* If address < lowpc then it's not a usable value, it's outside the
20761 pc range of the CU. However, we restrict the test to only address
20762 values of zero to preserve GDB's previous behaviour which is to
20763 handle the specific case of a function being GC'd by the linker. */
20765 if (address == 0 && address < lowpc)
20767 /* This line table is for a function which has been
20768 GCd by the linker. Ignore it. PR gdb/12528 */
20770 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
20771 long line_offset = line_ptr - get_debug_line_section (cu)->buffer;
20773 complaint (&symfile_complaints,
20774 _(".debug_line address at offset 0x%lx is 0 [in module %s]"),
20775 line_offset, objfile_name (objfile));
20776 m_record_line_callback = noop_record_line;
20777 /* Note: record_line_callback is left as noop_record_line until
20778 we see DW_LNE_end_sequence. */
20782 /* Subroutine of dwarf_decode_lines to simplify it.
20783 Process the line number information in LH.
20784 If DECODE_FOR_PST_P is non-zero, all we do is process the line number
20785 program in order to set included_p for every referenced header. */
20788 dwarf_decode_lines_1 (struct line_header *lh, struct dwarf2_cu *cu,
20789 const int decode_for_pst_p, CORE_ADDR lowpc)
20791 const gdb_byte *line_ptr, *extended_end;
20792 const gdb_byte *line_end;
20793 unsigned int bytes_read, extended_len;
20794 unsigned char op_code, extended_op;
20795 CORE_ADDR baseaddr;
20796 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
20797 bfd *abfd = objfile->obfd;
20798 struct gdbarch *gdbarch = get_objfile_arch (objfile);
20799 /* True if we're recording line info (as opposed to building partial
20800 symtabs and just interested in finding include files mentioned by
20801 the line number program). */
20802 bool record_lines_p = !decode_for_pst_p;
20804 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
20806 line_ptr = lh->statement_program_start;
20807 line_end = lh->statement_program_end;
20809 /* Read the statement sequences until there's nothing left. */
20810 while (line_ptr < line_end)
20812 /* The DWARF line number program state machine. Reset the state
20813 machine at the start of each sequence. */
20814 lnp_state_machine state_machine (gdbarch, lh, record_lines_p);
20815 bool end_sequence = false;
20817 if (record_lines_p)
20819 /* Start a subfile for the current file of the state
20821 const file_entry *fe = state_machine.current_file ();
20824 dwarf2_start_subfile (fe->name, fe->include_dir (lh));
20827 /* Decode the table. */
20828 while (line_ptr < line_end && !end_sequence)
20830 op_code = read_1_byte (abfd, line_ptr);
20833 if (op_code >= lh->opcode_base)
20835 /* Special opcode. */
20836 state_machine.handle_special_opcode (op_code);
20838 else switch (op_code)
20840 case DW_LNS_extended_op:
20841 extended_len = read_unsigned_leb128 (abfd, line_ptr,
20843 line_ptr += bytes_read;
20844 extended_end = line_ptr + extended_len;
20845 extended_op = read_1_byte (abfd, line_ptr);
20847 switch (extended_op)
20849 case DW_LNE_end_sequence:
20850 state_machine.handle_end_sequence ();
20851 end_sequence = true;
20853 case DW_LNE_set_address:
20856 = read_address (abfd, line_ptr, cu, &bytes_read);
20857 line_ptr += bytes_read;
20859 state_machine.check_line_address (cu, line_ptr,
20861 state_machine.handle_set_address (baseaddr, address);
20864 case DW_LNE_define_file:
20866 const char *cur_file;
20867 unsigned int mod_time, length;
20870 cur_file = read_direct_string (abfd, line_ptr,
20872 line_ptr += bytes_read;
20873 dindex = (dir_index)
20874 read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
20875 line_ptr += bytes_read;
20877 read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
20878 line_ptr += bytes_read;
20880 read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
20881 line_ptr += bytes_read;
20882 lh->add_file_name (cur_file, dindex, mod_time, length);
20885 case DW_LNE_set_discriminator:
20887 /* The discriminator is not interesting to the
20888 debugger; just ignore it. We still need to
20889 check its value though:
20890 if there are consecutive entries for the same
20891 (non-prologue) line we want to coalesce them.
20894 = read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
20895 line_ptr += bytes_read;
20897 state_machine.handle_set_discriminator (discr);
20901 complaint (&symfile_complaints,
20902 _("mangled .debug_line section"));
20905 /* Make sure that we parsed the extended op correctly. If e.g.
20906 we expected a different address size than the producer used,
20907 we may have read the wrong number of bytes. */
20908 if (line_ptr != extended_end)
20910 complaint (&symfile_complaints,
20911 _("mangled .debug_line section"));
20916 state_machine.handle_copy ();
20918 case DW_LNS_advance_pc:
20921 = read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
20922 line_ptr += bytes_read;
20924 state_machine.handle_advance_pc (adjust);
20927 case DW_LNS_advance_line:
20930 = read_signed_leb128 (abfd, line_ptr, &bytes_read);
20931 line_ptr += bytes_read;
20933 state_machine.handle_advance_line (line_delta);
20936 case DW_LNS_set_file:
20938 file_name_index file
20939 = (file_name_index) read_unsigned_leb128 (abfd, line_ptr,
20941 line_ptr += bytes_read;
20943 state_machine.handle_set_file (file);
20946 case DW_LNS_set_column:
20947 (void) read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
20948 line_ptr += bytes_read;
20950 case DW_LNS_negate_stmt:
20951 state_machine.handle_negate_stmt ();
20953 case DW_LNS_set_basic_block:
20955 /* Add to the address register of the state machine the
20956 address increment value corresponding to special opcode
20957 255. I.e., this value is scaled by the minimum
20958 instruction length since special opcode 255 would have
20959 scaled the increment. */
20960 case DW_LNS_const_add_pc:
20961 state_machine.handle_const_add_pc ();
20963 case DW_LNS_fixed_advance_pc:
20965 CORE_ADDR addr_adj = read_2_bytes (abfd, line_ptr);
20968 state_machine.handle_fixed_advance_pc (addr_adj);
20973 /* Unknown standard opcode, ignore it. */
20976 for (i = 0; i < lh->standard_opcode_lengths[op_code]; i++)
20978 (void) read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
20979 line_ptr += bytes_read;
20986 dwarf2_debug_line_missing_end_sequence_complaint ();
20988 /* We got a DW_LNE_end_sequence (or we ran off the end of the buffer,
20989 in which case we still finish recording the last line). */
20990 state_machine.record_line (true);
20994 /* Decode the Line Number Program (LNP) for the given line_header
20995 structure and CU. The actual information extracted and the type
20996 of structures created from the LNP depends on the value of PST.
20998 1. If PST is NULL, then this procedure uses the data from the program
20999 to create all necessary symbol tables, and their linetables.
21001 2. If PST is not NULL, this procedure reads the program to determine
21002 the list of files included by the unit represented by PST, and
21003 builds all the associated partial symbol tables.
21005 COMP_DIR is the compilation directory (DW_AT_comp_dir) or NULL if unknown.
21006 It is used for relative paths in the line table.
21007 NOTE: When processing partial symtabs (pst != NULL),
21008 comp_dir == pst->dirname.
21010 NOTE: It is important that psymtabs have the same file name (via strcmp)
21011 as the corresponding symtab. Since COMP_DIR is not used in the name of the
21012 symtab we don't use it in the name of the psymtabs we create.
21013 E.g. expand_line_sal requires this when finding psymtabs to expand.
21014 A good testcase for this is mb-inline.exp.
21016 LOWPC is the lowest address in CU (or 0 if not known).
21018 Boolean DECODE_MAPPING specifies we need to fully decode .debug_line
21019 for its PC<->lines mapping information. Otherwise only the filename
21020 table is read in. */
21023 dwarf_decode_lines (struct line_header *lh, const char *comp_dir,
21024 struct dwarf2_cu *cu, struct partial_symtab *pst,
21025 CORE_ADDR lowpc, int decode_mapping)
21027 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
21028 const int decode_for_pst_p = (pst != NULL);
21030 if (decode_mapping)
21031 dwarf_decode_lines_1 (lh, cu, decode_for_pst_p, lowpc);
21033 if (decode_for_pst_p)
21037 /* Now that we're done scanning the Line Header Program, we can
21038 create the psymtab of each included file. */
21039 for (file_index = 0; file_index < lh->file_names.size (); file_index++)
21040 if (lh->file_names[file_index].included_p == 1)
21042 gdb::unique_xmalloc_ptr<char> name_holder;
21043 const char *include_name =
21044 psymtab_include_file_name (lh, file_index, pst, comp_dir,
21046 if (include_name != NULL)
21047 dwarf2_create_include_psymtab (include_name, pst, objfile);
21052 /* Make sure a symtab is created for every file, even files
21053 which contain only variables (i.e. no code with associated
21055 struct compunit_symtab *cust = buildsym_compunit_symtab ();
21058 for (i = 0; i < lh->file_names.size (); i++)
21060 file_entry &fe = lh->file_names[i];
21062 dwarf2_start_subfile (fe.name, fe.include_dir (lh));
21064 if (current_subfile->symtab == NULL)
21066 current_subfile->symtab
21067 = allocate_symtab (cust, current_subfile->name);
21069 fe.symtab = current_subfile->symtab;
21074 /* Start a subfile for DWARF. FILENAME is the name of the file and
21075 DIRNAME the name of the source directory which contains FILENAME
21076 or NULL if not known.
21077 This routine tries to keep line numbers from identical absolute and
21078 relative file names in a common subfile.
21080 Using the `list' example from the GDB testsuite, which resides in
21081 /srcdir and compiling it with Irix6.2 cc in /compdir using a filename
21082 of /srcdir/list0.c yields the following debugging information for list0.c:
21084 DW_AT_name: /srcdir/list0.c
21085 DW_AT_comp_dir: /compdir
21086 files.files[0].name: list0.h
21087 files.files[0].dir: /srcdir
21088 files.files[1].name: list0.c
21089 files.files[1].dir: /srcdir
21091 The line number information for list0.c has to end up in a single
21092 subfile, so that `break /srcdir/list0.c:1' works as expected.
21093 start_subfile will ensure that this happens provided that we pass the
21094 concatenation of files.files[1].dir and files.files[1].name as the
21098 dwarf2_start_subfile (const char *filename, const char *dirname)
21102 /* In order not to lose the line information directory,
21103 we concatenate it to the filename when it makes sense.
21104 Note that the Dwarf3 standard says (speaking of filenames in line
21105 information): ``The directory index is ignored for file names
21106 that represent full path names''. Thus ignoring dirname in the
21107 `else' branch below isn't an issue. */
21109 if (!IS_ABSOLUTE_PATH (filename) && dirname != NULL)
21111 copy = concat (dirname, SLASH_STRING, filename, (char *)NULL);
21115 start_subfile (filename);
21121 /* Start a symtab for DWARF.
21122 NAME, COMP_DIR, LOW_PC are passed to start_symtab. */
21124 static struct compunit_symtab *
21125 dwarf2_start_symtab (struct dwarf2_cu *cu,
21126 const char *name, const char *comp_dir, CORE_ADDR low_pc)
21128 struct compunit_symtab *cust
21129 = start_symtab (cu->per_cu->dwarf2_per_objfile->objfile, name, comp_dir,
21130 low_pc, cu->language);
21132 record_debugformat ("DWARF 2");
21133 record_producer (cu->producer);
21135 /* We assume that we're processing GCC output. */
21136 processing_gcc_compilation = 2;
21138 cu->processing_has_namespace_info = 0;
21144 var_decode_location (struct attribute *attr, struct symbol *sym,
21145 struct dwarf2_cu *cu)
21147 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
21148 struct comp_unit_head *cu_header = &cu->header;
21150 /* NOTE drow/2003-01-30: There used to be a comment and some special
21151 code here to turn a symbol with DW_AT_external and a
21152 SYMBOL_VALUE_ADDRESS of 0 into a LOC_UNRESOLVED symbol. This was
21153 necessary for platforms (maybe Alpha, certainly PowerPC GNU/Linux
21154 with some versions of binutils) where shared libraries could have
21155 relocations against symbols in their debug information - the
21156 minimal symbol would have the right address, but the debug info
21157 would not. It's no longer necessary, because we will explicitly
21158 apply relocations when we read in the debug information now. */
21160 /* A DW_AT_location attribute with no contents indicates that a
21161 variable has been optimized away. */
21162 if (attr_form_is_block (attr) && DW_BLOCK (attr)->size == 0)
21164 SYMBOL_ACLASS_INDEX (sym) = LOC_OPTIMIZED_OUT;
21168 /* Handle one degenerate form of location expression specially, to
21169 preserve GDB's previous behavior when section offsets are
21170 specified. If this is just a DW_OP_addr or DW_OP_GNU_addr_index
21171 then mark this symbol as LOC_STATIC. */
21173 if (attr_form_is_block (attr)
21174 && ((DW_BLOCK (attr)->data[0] == DW_OP_addr
21175 && DW_BLOCK (attr)->size == 1 + cu_header->addr_size)
21176 || (DW_BLOCK (attr)->data[0] == DW_OP_GNU_addr_index
21177 && (DW_BLOCK (attr)->size
21178 == 1 + leb128_size (&DW_BLOCK (attr)->data[1])))))
21180 unsigned int dummy;
21182 if (DW_BLOCK (attr)->data[0] == DW_OP_addr)
21183 SYMBOL_VALUE_ADDRESS (sym) =
21184 read_address (objfile->obfd, DW_BLOCK (attr)->data + 1, cu, &dummy);
21186 SYMBOL_VALUE_ADDRESS (sym) =
21187 read_addr_index_from_leb128 (cu, DW_BLOCK (attr)->data + 1, &dummy);
21188 SYMBOL_ACLASS_INDEX (sym) = LOC_STATIC;
21189 fixup_symbol_section (sym, objfile);
21190 SYMBOL_VALUE_ADDRESS (sym) += ANOFFSET (objfile->section_offsets,
21191 SYMBOL_SECTION (sym));
21195 /* NOTE drow/2002-01-30: It might be worthwhile to have a static
21196 expression evaluator, and use LOC_COMPUTED only when necessary
21197 (i.e. when the value of a register or memory location is
21198 referenced, or a thread-local block, etc.). Then again, it might
21199 not be worthwhile. I'm assuming that it isn't unless performance
21200 or memory numbers show me otherwise. */
21202 dwarf2_symbol_mark_computed (attr, sym, cu, 0);
21204 if (SYMBOL_COMPUTED_OPS (sym)->location_has_loclist)
21205 cu->has_loclist = 1;
21208 /* Given a pointer to a DWARF information entry, figure out if we need
21209 to make a symbol table entry for it, and if so, create a new entry
21210 and return a pointer to it.
21211 If TYPE is NULL, determine symbol type from the die, otherwise
21212 used the passed type.
21213 If SPACE is not NULL, use it to hold the new symbol. If it is
21214 NULL, allocate a new symbol on the objfile's obstack. */
21216 static struct symbol *
21217 new_symbol (struct die_info *die, struct type *type, struct dwarf2_cu *cu,
21218 struct symbol *space)
21220 struct dwarf2_per_objfile *dwarf2_per_objfile
21221 = cu->per_cu->dwarf2_per_objfile;
21222 struct objfile *objfile = dwarf2_per_objfile->objfile;
21223 struct gdbarch *gdbarch = get_objfile_arch (objfile);
21224 struct symbol *sym = NULL;
21226 struct attribute *attr = NULL;
21227 struct attribute *attr2 = NULL;
21228 CORE_ADDR baseaddr;
21229 struct pending **list_to_add = NULL;
21231 int inlined_func = (die->tag == DW_TAG_inlined_subroutine);
21233 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
21235 name = dwarf2_name (die, cu);
21238 const char *linkagename;
21239 int suppress_add = 0;
21244 sym = allocate_symbol (objfile);
21245 OBJSTAT (objfile, n_syms++);
21247 /* Cache this symbol's name and the name's demangled form (if any). */
21248 SYMBOL_SET_LANGUAGE (sym, cu->language, &objfile->objfile_obstack);
21249 linkagename = dwarf2_physname (name, die, cu);
21250 SYMBOL_SET_NAMES (sym, linkagename, strlen (linkagename), 0, objfile);
21252 /* Fortran does not have mangling standard and the mangling does differ
21253 between gfortran, iFort etc. */
21254 if (cu->language == language_fortran
21255 && symbol_get_demangled_name (&(sym->ginfo)) == NULL)
21256 symbol_set_demangled_name (&(sym->ginfo),
21257 dwarf2_full_name (name, die, cu),
21260 /* Default assumptions.
21261 Use the passed type or decode it from the die. */
21262 SYMBOL_DOMAIN (sym) = VAR_DOMAIN;
21263 SYMBOL_ACLASS_INDEX (sym) = LOC_OPTIMIZED_OUT;
21265 SYMBOL_TYPE (sym) = type;
21267 SYMBOL_TYPE (sym) = die_type (die, cu);
21268 attr = dwarf2_attr (die,
21269 inlined_func ? DW_AT_call_line : DW_AT_decl_line,
21273 SYMBOL_LINE (sym) = DW_UNSND (attr);
21276 attr = dwarf2_attr (die,
21277 inlined_func ? DW_AT_call_file : DW_AT_decl_file,
21281 file_name_index file_index = (file_name_index) DW_UNSND (attr);
21282 struct file_entry *fe;
21284 if (cu->line_header != NULL)
21285 fe = cu->line_header->file_name_at (file_index);
21290 complaint (&symfile_complaints,
21291 _("file index out of range"));
21293 symbol_set_symtab (sym, fe->symtab);
21299 attr = dwarf2_attr (die, DW_AT_low_pc, cu);
21304 addr = attr_value_as_address (attr);
21305 addr = gdbarch_adjust_dwarf2_addr (gdbarch, addr + baseaddr);
21306 SYMBOL_VALUE_ADDRESS (sym) = addr;
21308 SYMBOL_TYPE (sym) = objfile_type (objfile)->builtin_core_addr;
21309 SYMBOL_DOMAIN (sym) = LABEL_DOMAIN;
21310 SYMBOL_ACLASS_INDEX (sym) = LOC_LABEL;
21311 add_symbol_to_list (sym, cu->list_in_scope);
21313 case DW_TAG_subprogram:
21314 /* SYMBOL_BLOCK_VALUE (sym) will be filled in later by
21316 SYMBOL_ACLASS_INDEX (sym) = LOC_BLOCK;
21317 attr2 = dwarf2_attr (die, DW_AT_external, cu);
21318 if ((attr2 && (DW_UNSND (attr2) != 0))
21319 || cu->language == language_ada)
21321 /* Subprograms marked external are stored as a global symbol.
21322 Ada subprograms, whether marked external or not, are always
21323 stored as a global symbol, because we want to be able to
21324 access them globally. For instance, we want to be able
21325 to break on a nested subprogram without having to
21326 specify the context. */
21327 list_to_add = &global_symbols;
21331 list_to_add = cu->list_in_scope;
21334 case DW_TAG_inlined_subroutine:
21335 /* SYMBOL_BLOCK_VALUE (sym) will be filled in later by
21337 SYMBOL_ACLASS_INDEX (sym) = LOC_BLOCK;
21338 SYMBOL_INLINED (sym) = 1;
21339 list_to_add = cu->list_in_scope;
21341 case DW_TAG_template_value_param:
21343 /* Fall through. */
21344 case DW_TAG_constant:
21345 case DW_TAG_variable:
21346 case DW_TAG_member:
21347 /* Compilation with minimal debug info may result in
21348 variables with missing type entries. Change the
21349 misleading `void' type to something sensible. */
21350 if (TYPE_CODE (SYMBOL_TYPE (sym)) == TYPE_CODE_VOID)
21351 SYMBOL_TYPE (sym) = objfile_type (objfile)->builtin_int;
21353 attr = dwarf2_attr (die, DW_AT_const_value, cu);
21354 /* In the case of DW_TAG_member, we should only be called for
21355 static const members. */
21356 if (die->tag == DW_TAG_member)
21358 /* dwarf2_add_field uses die_is_declaration,
21359 so we do the same. */
21360 gdb_assert (die_is_declaration (die, cu));
21365 dwarf2_const_value (attr, sym, cu);
21366 attr2 = dwarf2_attr (die, DW_AT_external, cu);
21369 if (attr2 && (DW_UNSND (attr2) != 0))
21370 list_to_add = &global_symbols;
21372 list_to_add = cu->list_in_scope;
21376 attr = dwarf2_attr (die, DW_AT_location, cu);
21379 var_decode_location (attr, sym, cu);
21380 attr2 = dwarf2_attr (die, DW_AT_external, cu);
21382 /* Fortran explicitly imports any global symbols to the local
21383 scope by DW_TAG_common_block. */
21384 if (cu->language == language_fortran && die->parent
21385 && die->parent->tag == DW_TAG_common_block)
21388 if (SYMBOL_CLASS (sym) == LOC_STATIC
21389 && SYMBOL_VALUE_ADDRESS (sym) == 0
21390 && !dwarf2_per_objfile->has_section_at_zero)
21392 /* When a static variable is eliminated by the linker,
21393 the corresponding debug information is not stripped
21394 out, but the variable address is set to null;
21395 do not add such variables into symbol table. */
21397 else if (attr2 && (DW_UNSND (attr2) != 0))
21399 /* Workaround gfortran PR debug/40040 - it uses
21400 DW_AT_location for variables in -fPIC libraries which may
21401 get overriden by other libraries/executable and get
21402 a different address. Resolve it by the minimal symbol
21403 which may come from inferior's executable using copy
21404 relocation. Make this workaround only for gfortran as for
21405 other compilers GDB cannot guess the minimal symbol
21406 Fortran mangling kind. */
21407 if (cu->language == language_fortran && die->parent
21408 && die->parent->tag == DW_TAG_module
21410 && startswith (cu->producer, "GNU Fortran"))
21411 SYMBOL_ACLASS_INDEX (sym) = LOC_UNRESOLVED;
21413 /* A variable with DW_AT_external is never static,
21414 but it may be block-scoped. */
21415 list_to_add = (cu->list_in_scope == &file_symbols
21416 ? &global_symbols : cu->list_in_scope);
21419 list_to_add = cu->list_in_scope;
21423 /* We do not know the address of this symbol.
21424 If it is an external symbol and we have type information
21425 for it, enter the symbol as a LOC_UNRESOLVED symbol.
21426 The address of the variable will then be determined from
21427 the minimal symbol table whenever the variable is
21429 attr2 = dwarf2_attr (die, DW_AT_external, cu);
21431 /* Fortran explicitly imports any global symbols to the local
21432 scope by DW_TAG_common_block. */
21433 if (cu->language == language_fortran && die->parent
21434 && die->parent->tag == DW_TAG_common_block)
21436 /* SYMBOL_CLASS doesn't matter here because
21437 read_common_block is going to reset it. */
21439 list_to_add = cu->list_in_scope;
21441 else if (attr2 && (DW_UNSND (attr2) != 0)
21442 && dwarf2_attr (die, DW_AT_type, cu) != NULL)
21444 /* A variable with DW_AT_external is never static, but it
21445 may be block-scoped. */
21446 list_to_add = (cu->list_in_scope == &file_symbols
21447 ? &global_symbols : cu->list_in_scope);
21449 SYMBOL_ACLASS_INDEX (sym) = LOC_UNRESOLVED;
21451 else if (!die_is_declaration (die, cu))
21453 /* Use the default LOC_OPTIMIZED_OUT class. */
21454 gdb_assert (SYMBOL_CLASS (sym) == LOC_OPTIMIZED_OUT);
21456 list_to_add = cu->list_in_scope;
21460 case DW_TAG_formal_parameter:
21461 /* If we are inside a function, mark this as an argument. If
21462 not, we might be looking at an argument to an inlined function
21463 when we do not have enough information to show inlined frames;
21464 pretend it's a local variable in that case so that the user can
21466 if (context_stack_depth > 0
21467 && context_stack[context_stack_depth - 1].name != NULL)
21468 SYMBOL_IS_ARGUMENT (sym) = 1;
21469 attr = dwarf2_attr (die, DW_AT_location, cu);
21472 var_decode_location (attr, sym, cu);
21474 attr = dwarf2_attr (die, DW_AT_const_value, cu);
21477 dwarf2_const_value (attr, sym, cu);
21480 list_to_add = cu->list_in_scope;
21482 case DW_TAG_unspecified_parameters:
21483 /* From varargs functions; gdb doesn't seem to have any
21484 interest in this information, so just ignore it for now.
21487 case DW_TAG_template_type_param:
21489 /* Fall through. */
21490 case DW_TAG_class_type:
21491 case DW_TAG_interface_type:
21492 case DW_TAG_structure_type:
21493 case DW_TAG_union_type:
21494 case DW_TAG_set_type:
21495 case DW_TAG_enumeration_type:
21496 SYMBOL_ACLASS_INDEX (sym) = LOC_TYPEDEF;
21497 SYMBOL_DOMAIN (sym) = STRUCT_DOMAIN;
21500 /* NOTE: carlton/2003-11-10: C++ class symbols shouldn't
21501 really ever be static objects: otherwise, if you try
21502 to, say, break of a class's method and you're in a file
21503 which doesn't mention that class, it won't work unless
21504 the check for all static symbols in lookup_symbol_aux
21505 saves you. See the OtherFileClass tests in
21506 gdb.c++/namespace.exp. */
21510 list_to_add = (cu->list_in_scope == &file_symbols
21511 && cu->language == language_cplus
21512 ? &global_symbols : cu->list_in_scope);
21514 /* The semantics of C++ state that "struct foo {
21515 ... }" also defines a typedef for "foo". */
21516 if (cu->language == language_cplus
21517 || cu->language == language_ada
21518 || cu->language == language_d
21519 || cu->language == language_rust)
21521 /* The symbol's name is already allocated along
21522 with this objfile, so we don't need to
21523 duplicate it for the type. */
21524 if (TYPE_NAME (SYMBOL_TYPE (sym)) == 0)
21525 TYPE_NAME (SYMBOL_TYPE (sym)) = SYMBOL_SEARCH_NAME (sym);
21530 case DW_TAG_typedef:
21531 SYMBOL_ACLASS_INDEX (sym) = LOC_TYPEDEF;
21532 SYMBOL_DOMAIN (sym) = VAR_DOMAIN;
21533 list_to_add = cu->list_in_scope;
21535 case DW_TAG_base_type:
21536 case DW_TAG_subrange_type:
21537 SYMBOL_ACLASS_INDEX (sym) = LOC_TYPEDEF;
21538 SYMBOL_DOMAIN (sym) = VAR_DOMAIN;
21539 list_to_add = cu->list_in_scope;
21541 case DW_TAG_enumerator:
21542 attr = dwarf2_attr (die, DW_AT_const_value, cu);
21545 dwarf2_const_value (attr, sym, cu);
21548 /* NOTE: carlton/2003-11-10: See comment above in the
21549 DW_TAG_class_type, etc. block. */
21551 list_to_add = (cu->list_in_scope == &file_symbols
21552 && cu->language == language_cplus
21553 ? &global_symbols : cu->list_in_scope);
21556 case DW_TAG_imported_declaration:
21557 case DW_TAG_namespace:
21558 SYMBOL_ACLASS_INDEX (sym) = LOC_TYPEDEF;
21559 list_to_add = &global_symbols;
21561 case DW_TAG_module:
21562 SYMBOL_ACLASS_INDEX (sym) = LOC_TYPEDEF;
21563 SYMBOL_DOMAIN (sym) = MODULE_DOMAIN;
21564 list_to_add = &global_symbols;
21566 case DW_TAG_common_block:
21567 SYMBOL_ACLASS_INDEX (sym) = LOC_COMMON_BLOCK;
21568 SYMBOL_DOMAIN (sym) = COMMON_BLOCK_DOMAIN;
21569 add_symbol_to_list (sym, cu->list_in_scope);
21572 /* Not a tag we recognize. Hopefully we aren't processing
21573 trash data, but since we must specifically ignore things
21574 we don't recognize, there is nothing else we should do at
21576 complaint (&symfile_complaints, _("unsupported tag: '%s'"),
21577 dwarf_tag_name (die->tag));
21583 sym->hash_next = objfile->template_symbols;
21584 objfile->template_symbols = sym;
21585 list_to_add = NULL;
21588 if (list_to_add != NULL)
21589 add_symbol_to_list (sym, list_to_add);
21591 /* For the benefit of old versions of GCC, check for anonymous
21592 namespaces based on the demangled name. */
21593 if (!cu->processing_has_namespace_info
21594 && cu->language == language_cplus)
21595 cp_scan_for_anonymous_namespaces (sym, objfile);
21600 /* Given an attr with a DW_FORM_dataN value in host byte order,
21601 zero-extend it as appropriate for the symbol's type. The DWARF
21602 standard (v4) is not entirely clear about the meaning of using
21603 DW_FORM_dataN for a constant with a signed type, where the type is
21604 wider than the data. The conclusion of a discussion on the DWARF
21605 list was that this is unspecified. We choose to always zero-extend
21606 because that is the interpretation long in use by GCC. */
21609 dwarf2_const_value_data (const struct attribute *attr, struct obstack *obstack,
21610 struct dwarf2_cu *cu, LONGEST *value, int bits)
21612 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
21613 enum bfd_endian byte_order = bfd_big_endian (objfile->obfd) ?
21614 BFD_ENDIAN_BIG : BFD_ENDIAN_LITTLE;
21615 LONGEST l = DW_UNSND (attr);
21617 if (bits < sizeof (*value) * 8)
21619 l &= ((LONGEST) 1 << bits) - 1;
21622 else if (bits == sizeof (*value) * 8)
21626 gdb_byte *bytes = (gdb_byte *) obstack_alloc (obstack, bits / 8);
21627 store_unsigned_integer (bytes, bits / 8, byte_order, l);
21634 /* Read a constant value from an attribute. Either set *VALUE, or if
21635 the value does not fit in *VALUE, set *BYTES - either already
21636 allocated on the objfile obstack, or newly allocated on OBSTACK,
21637 or, set *BATON, if we translated the constant to a location
21641 dwarf2_const_value_attr (const struct attribute *attr, struct type *type,
21642 const char *name, struct obstack *obstack,
21643 struct dwarf2_cu *cu,
21644 LONGEST *value, const gdb_byte **bytes,
21645 struct dwarf2_locexpr_baton **baton)
21647 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
21648 struct comp_unit_head *cu_header = &cu->header;
21649 struct dwarf_block *blk;
21650 enum bfd_endian byte_order = (bfd_big_endian (objfile->obfd) ?
21651 BFD_ENDIAN_BIG : BFD_ENDIAN_LITTLE);
21657 switch (attr->form)
21660 case DW_FORM_GNU_addr_index:
21664 if (TYPE_LENGTH (type) != cu_header->addr_size)
21665 dwarf2_const_value_length_mismatch_complaint (name,
21666 cu_header->addr_size,
21667 TYPE_LENGTH (type));
21668 /* Symbols of this form are reasonably rare, so we just
21669 piggyback on the existing location code rather than writing
21670 a new implementation of symbol_computed_ops. */
21671 *baton = XOBNEW (obstack, struct dwarf2_locexpr_baton);
21672 (*baton)->per_cu = cu->per_cu;
21673 gdb_assert ((*baton)->per_cu);
21675 (*baton)->size = 2 + cu_header->addr_size;
21676 data = (gdb_byte *) obstack_alloc (obstack, (*baton)->size);
21677 (*baton)->data = data;
21679 data[0] = DW_OP_addr;
21680 store_unsigned_integer (&data[1], cu_header->addr_size,
21681 byte_order, DW_ADDR (attr));
21682 data[cu_header->addr_size + 1] = DW_OP_stack_value;
21685 case DW_FORM_string:
21687 case DW_FORM_GNU_str_index:
21688 case DW_FORM_GNU_strp_alt:
21689 /* DW_STRING is already allocated on the objfile obstack, point
21691 *bytes = (const gdb_byte *) DW_STRING (attr);
21693 case DW_FORM_block1:
21694 case DW_FORM_block2:
21695 case DW_FORM_block4:
21696 case DW_FORM_block:
21697 case DW_FORM_exprloc:
21698 case DW_FORM_data16:
21699 blk = DW_BLOCK (attr);
21700 if (TYPE_LENGTH (type) != blk->size)
21701 dwarf2_const_value_length_mismatch_complaint (name, blk->size,
21702 TYPE_LENGTH (type));
21703 *bytes = blk->data;
21706 /* The DW_AT_const_value attributes are supposed to carry the
21707 symbol's value "represented as it would be on the target
21708 architecture." By the time we get here, it's already been
21709 converted to host endianness, so we just need to sign- or
21710 zero-extend it as appropriate. */
21711 case DW_FORM_data1:
21712 *bytes = dwarf2_const_value_data (attr, obstack, cu, value, 8);
21714 case DW_FORM_data2:
21715 *bytes = dwarf2_const_value_data (attr, obstack, cu, value, 16);
21717 case DW_FORM_data4:
21718 *bytes = dwarf2_const_value_data (attr, obstack, cu, value, 32);
21720 case DW_FORM_data8:
21721 *bytes = dwarf2_const_value_data (attr, obstack, cu, value, 64);
21724 case DW_FORM_sdata:
21725 case DW_FORM_implicit_const:
21726 *value = DW_SND (attr);
21729 case DW_FORM_udata:
21730 *value = DW_UNSND (attr);
21734 complaint (&symfile_complaints,
21735 _("unsupported const value attribute form: '%s'"),
21736 dwarf_form_name (attr->form));
21743 /* Copy constant value from an attribute to a symbol. */
21746 dwarf2_const_value (const struct attribute *attr, struct symbol *sym,
21747 struct dwarf2_cu *cu)
21749 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
21751 const gdb_byte *bytes;
21752 struct dwarf2_locexpr_baton *baton;
21754 dwarf2_const_value_attr (attr, SYMBOL_TYPE (sym),
21755 SYMBOL_PRINT_NAME (sym),
21756 &objfile->objfile_obstack, cu,
21757 &value, &bytes, &baton);
21761 SYMBOL_LOCATION_BATON (sym) = baton;
21762 SYMBOL_ACLASS_INDEX (sym) = dwarf2_locexpr_index;
21764 else if (bytes != NULL)
21766 SYMBOL_VALUE_BYTES (sym) = bytes;
21767 SYMBOL_ACLASS_INDEX (sym) = LOC_CONST_BYTES;
21771 SYMBOL_VALUE (sym) = value;
21772 SYMBOL_ACLASS_INDEX (sym) = LOC_CONST;
21776 /* Return the type of the die in question using its DW_AT_type attribute. */
21778 static struct type *
21779 die_type (struct die_info *die, struct dwarf2_cu *cu)
21781 struct attribute *type_attr;
21783 type_attr = dwarf2_attr (die, DW_AT_type, cu);
21786 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
21787 /* A missing DW_AT_type represents a void type. */
21788 return objfile_type (objfile)->builtin_void;
21791 return lookup_die_type (die, type_attr, cu);
21794 /* True iff CU's producer generates GNAT Ada auxiliary information
21795 that allows to find parallel types through that information instead
21796 of having to do expensive parallel lookups by type name. */
21799 need_gnat_info (struct dwarf2_cu *cu)
21801 /* Assume that the Ada compiler was GNAT, which always produces
21802 the auxiliary information. */
21803 return (cu->language == language_ada);
21806 /* Return the auxiliary type of the die in question using its
21807 DW_AT_GNAT_descriptive_type attribute. Returns NULL if the
21808 attribute is not present. */
21810 static struct type *
21811 die_descriptive_type (struct die_info *die, struct dwarf2_cu *cu)
21813 struct attribute *type_attr;
21815 type_attr = dwarf2_attr (die, DW_AT_GNAT_descriptive_type, cu);
21819 return lookup_die_type (die, type_attr, cu);
21822 /* If DIE has a descriptive_type attribute, then set the TYPE's
21823 descriptive type accordingly. */
21826 set_descriptive_type (struct type *type, struct die_info *die,
21827 struct dwarf2_cu *cu)
21829 struct type *descriptive_type = die_descriptive_type (die, cu);
21831 if (descriptive_type)
21833 ALLOCATE_GNAT_AUX_TYPE (type);
21834 TYPE_DESCRIPTIVE_TYPE (type) = descriptive_type;
21838 /* Return the containing type of the die in question using its
21839 DW_AT_containing_type attribute. */
21841 static struct type *
21842 die_containing_type (struct die_info *die, struct dwarf2_cu *cu)
21844 struct attribute *type_attr;
21845 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
21847 type_attr = dwarf2_attr (die, DW_AT_containing_type, cu);
21849 error (_("Dwarf Error: Problem turning containing type into gdb type "
21850 "[in module %s]"), objfile_name (objfile));
21852 return lookup_die_type (die, type_attr, cu);
21855 /* Return an error marker type to use for the ill formed type in DIE/CU. */
21857 static struct type *
21858 build_error_marker_type (struct dwarf2_cu *cu, struct die_info *die)
21860 struct dwarf2_per_objfile *dwarf2_per_objfile
21861 = cu->per_cu->dwarf2_per_objfile;
21862 struct objfile *objfile = dwarf2_per_objfile->objfile;
21863 char *message, *saved;
21865 message = xstrprintf (_("<unknown type in %s, CU %s, DIE %s>"),
21866 objfile_name (objfile),
21867 sect_offset_str (cu->header.sect_off),
21868 sect_offset_str (die->sect_off));
21869 saved = (char *) obstack_copy0 (&objfile->objfile_obstack,
21870 message, strlen (message));
21873 return init_type (objfile, TYPE_CODE_ERROR, 0, saved);
21876 /* Look up the type of DIE in CU using its type attribute ATTR.
21877 ATTR must be one of: DW_AT_type, DW_AT_GNAT_descriptive_type,
21878 DW_AT_containing_type.
21879 If there is no type substitute an error marker. */
21881 static struct type *
21882 lookup_die_type (struct die_info *die, const struct attribute *attr,
21883 struct dwarf2_cu *cu)
21885 struct dwarf2_per_objfile *dwarf2_per_objfile
21886 = cu->per_cu->dwarf2_per_objfile;
21887 struct objfile *objfile = dwarf2_per_objfile->objfile;
21888 struct type *this_type;
21890 gdb_assert (attr->name == DW_AT_type
21891 || attr->name == DW_AT_GNAT_descriptive_type
21892 || attr->name == DW_AT_containing_type);
21894 /* First see if we have it cached. */
21896 if (attr->form == DW_FORM_GNU_ref_alt)
21898 struct dwarf2_per_cu_data *per_cu;
21899 sect_offset sect_off = dwarf2_get_ref_die_offset (attr);
21901 per_cu = dwarf2_find_containing_comp_unit (sect_off, 1,
21902 dwarf2_per_objfile);
21903 this_type = get_die_type_at_offset (sect_off, per_cu);
21905 else if (attr_form_is_ref (attr))
21907 sect_offset sect_off = dwarf2_get_ref_die_offset (attr);
21909 this_type = get_die_type_at_offset (sect_off, cu->per_cu);
21911 else if (attr->form == DW_FORM_ref_sig8)
21913 ULONGEST signature = DW_SIGNATURE (attr);
21915 return get_signatured_type (die, signature, cu);
21919 complaint (&symfile_complaints,
21920 _("Dwarf Error: Bad type attribute %s in DIE"
21921 " at %s [in module %s]"),
21922 dwarf_attr_name (attr->name), sect_offset_str (die->sect_off),
21923 objfile_name (objfile));
21924 return build_error_marker_type (cu, die);
21927 /* If not cached we need to read it in. */
21929 if (this_type == NULL)
21931 struct die_info *type_die = NULL;
21932 struct dwarf2_cu *type_cu = cu;
21934 if (attr_form_is_ref (attr))
21935 type_die = follow_die_ref (die, attr, &type_cu);
21936 if (type_die == NULL)
21937 return build_error_marker_type (cu, die);
21938 /* If we find the type now, it's probably because the type came
21939 from an inter-CU reference and the type's CU got expanded before
21941 this_type = read_type_die (type_die, type_cu);
21944 /* If we still don't have a type use an error marker. */
21946 if (this_type == NULL)
21947 return build_error_marker_type (cu, die);
21952 /* Return the type in DIE, CU.
21953 Returns NULL for invalid types.
21955 This first does a lookup in die_type_hash,
21956 and only reads the die in if necessary.
21958 NOTE: This can be called when reading in partial or full symbols. */
21960 static struct type *
21961 read_type_die (struct die_info *die, struct dwarf2_cu *cu)
21963 struct type *this_type;
21965 this_type = get_die_type (die, cu);
21969 return read_type_die_1 (die, cu);
21972 /* Read the type in DIE, CU.
21973 Returns NULL for invalid types. */
21975 static struct type *
21976 read_type_die_1 (struct die_info *die, struct dwarf2_cu *cu)
21978 struct type *this_type = NULL;
21982 case DW_TAG_class_type:
21983 case DW_TAG_interface_type:
21984 case DW_TAG_structure_type:
21985 case DW_TAG_union_type:
21986 this_type = read_structure_type (die, cu);
21988 case DW_TAG_enumeration_type:
21989 this_type = read_enumeration_type (die, cu);
21991 case DW_TAG_subprogram:
21992 case DW_TAG_subroutine_type:
21993 case DW_TAG_inlined_subroutine:
21994 this_type = read_subroutine_type (die, cu);
21996 case DW_TAG_array_type:
21997 this_type = read_array_type (die, cu);
21999 case DW_TAG_set_type:
22000 this_type = read_set_type (die, cu);
22002 case DW_TAG_pointer_type:
22003 this_type = read_tag_pointer_type (die, cu);
22005 case DW_TAG_ptr_to_member_type:
22006 this_type = read_tag_ptr_to_member_type (die, cu);
22008 case DW_TAG_reference_type:
22009 this_type = read_tag_reference_type (die, cu, TYPE_CODE_REF);
22011 case DW_TAG_rvalue_reference_type:
22012 this_type = read_tag_reference_type (die, cu, TYPE_CODE_RVALUE_REF);
22014 case DW_TAG_const_type:
22015 this_type = read_tag_const_type (die, cu);
22017 case DW_TAG_volatile_type:
22018 this_type = read_tag_volatile_type (die, cu);
22020 case DW_TAG_restrict_type:
22021 this_type = read_tag_restrict_type (die, cu);
22023 case DW_TAG_string_type:
22024 this_type = read_tag_string_type (die, cu);
22026 case DW_TAG_typedef:
22027 this_type = read_typedef (die, cu);
22029 case DW_TAG_subrange_type:
22030 this_type = read_subrange_type (die, cu);
22032 case DW_TAG_base_type:
22033 this_type = read_base_type (die, cu);
22035 case DW_TAG_unspecified_type:
22036 this_type = read_unspecified_type (die, cu);
22038 case DW_TAG_namespace:
22039 this_type = read_namespace_type (die, cu);
22041 case DW_TAG_module:
22042 this_type = read_module_type (die, cu);
22044 case DW_TAG_atomic_type:
22045 this_type = read_tag_atomic_type (die, cu);
22048 complaint (&symfile_complaints,
22049 _("unexpected tag in read_type_die: '%s'"),
22050 dwarf_tag_name (die->tag));
22057 /* See if we can figure out if the class lives in a namespace. We do
22058 this by looking for a member function; its demangled name will
22059 contain namespace info, if there is any.
22060 Return the computed name or NULL.
22061 Space for the result is allocated on the objfile's obstack.
22062 This is the full-die version of guess_partial_die_structure_name.
22063 In this case we know DIE has no useful parent. */
22066 guess_full_die_structure_name (struct die_info *die, struct dwarf2_cu *cu)
22068 struct die_info *spec_die;
22069 struct dwarf2_cu *spec_cu;
22070 struct die_info *child;
22071 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
22074 spec_die = die_specification (die, &spec_cu);
22075 if (spec_die != NULL)
22081 for (child = die->child;
22083 child = child->sibling)
22085 if (child->tag == DW_TAG_subprogram)
22087 const char *linkage_name = dw2_linkage_name (child, cu);
22089 if (linkage_name != NULL)
22092 = language_class_name_from_physname (cu->language_defn,
22096 if (actual_name != NULL)
22098 const char *die_name = dwarf2_name (die, cu);
22100 if (die_name != NULL
22101 && strcmp (die_name, actual_name) != 0)
22103 /* Strip off the class name from the full name.
22104 We want the prefix. */
22105 int die_name_len = strlen (die_name);
22106 int actual_name_len = strlen (actual_name);
22108 /* Test for '::' as a sanity check. */
22109 if (actual_name_len > die_name_len + 2
22110 && actual_name[actual_name_len
22111 - die_name_len - 1] == ':')
22112 name = (char *) obstack_copy0 (
22113 &objfile->per_bfd->storage_obstack,
22114 actual_name, actual_name_len - die_name_len - 2);
22117 xfree (actual_name);
22126 /* GCC might emit a nameless typedef that has a linkage name. Determine the
22127 prefix part in such case. See
22128 http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47510. */
22130 static const char *
22131 anonymous_struct_prefix (struct die_info *die, struct dwarf2_cu *cu)
22133 struct attribute *attr;
22136 if (die->tag != DW_TAG_class_type && die->tag != DW_TAG_interface_type
22137 && die->tag != DW_TAG_structure_type && die->tag != DW_TAG_union_type)
22140 if (dwarf2_string_attr (die, DW_AT_name, cu) != NULL)
22143 attr = dw2_linkage_name_attr (die, cu);
22144 if (attr == NULL || DW_STRING (attr) == NULL)
22147 /* dwarf2_name had to be already called. */
22148 gdb_assert (DW_STRING_IS_CANONICAL (attr));
22150 /* Strip the base name, keep any leading namespaces/classes. */
22151 base = strrchr (DW_STRING (attr), ':');
22152 if (base == NULL || base == DW_STRING (attr) || base[-1] != ':')
22155 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
22156 return (char *) obstack_copy0 (&objfile->per_bfd->storage_obstack,
22158 &base[-1] - DW_STRING (attr));
22161 /* Return the name of the namespace/class that DIE is defined within,
22162 or "" if we can't tell. The caller should not xfree the result.
22164 For example, if we're within the method foo() in the following
22174 then determine_prefix on foo's die will return "N::C". */
22176 static const char *
22177 determine_prefix (struct die_info *die, struct dwarf2_cu *cu)
22179 struct dwarf2_per_objfile *dwarf2_per_objfile
22180 = cu->per_cu->dwarf2_per_objfile;
22181 struct die_info *parent, *spec_die;
22182 struct dwarf2_cu *spec_cu;
22183 struct type *parent_type;
22184 const char *retval;
22186 if (cu->language != language_cplus
22187 && cu->language != language_fortran && cu->language != language_d
22188 && cu->language != language_rust)
22191 retval = anonymous_struct_prefix (die, cu);
22195 /* We have to be careful in the presence of DW_AT_specification.
22196 For example, with GCC 3.4, given the code
22200 // Definition of N::foo.
22204 then we'll have a tree of DIEs like this:
22206 1: DW_TAG_compile_unit
22207 2: DW_TAG_namespace // N
22208 3: DW_TAG_subprogram // declaration of N::foo
22209 4: DW_TAG_subprogram // definition of N::foo
22210 DW_AT_specification // refers to die #3
22212 Thus, when processing die #4, we have to pretend that we're in
22213 the context of its DW_AT_specification, namely the contex of die
22216 spec_die = die_specification (die, &spec_cu);
22217 if (spec_die == NULL)
22218 parent = die->parent;
22221 parent = spec_die->parent;
22225 if (parent == NULL)
22227 else if (parent->building_fullname)
22230 const char *parent_name;
22232 /* It has been seen on RealView 2.2 built binaries,
22233 DW_TAG_template_type_param types actually _defined_ as
22234 children of the parent class:
22237 template class <class Enum> Class{};
22238 Class<enum E> class_e;
22240 1: DW_TAG_class_type (Class)
22241 2: DW_TAG_enumeration_type (E)
22242 3: DW_TAG_enumerator (enum1:0)
22243 3: DW_TAG_enumerator (enum2:1)
22245 2: DW_TAG_template_type_param
22246 DW_AT_type DW_FORM_ref_udata (E)
22248 Besides being broken debug info, it can put GDB into an
22249 infinite loop. Consider:
22251 When we're building the full name for Class<E>, we'll start
22252 at Class, and go look over its template type parameters,
22253 finding E. We'll then try to build the full name of E, and
22254 reach here. We're now trying to build the full name of E,
22255 and look over the parent DIE for containing scope. In the
22256 broken case, if we followed the parent DIE of E, we'd again
22257 find Class, and once again go look at its template type
22258 arguments, etc., etc. Simply don't consider such parent die
22259 as source-level parent of this die (it can't be, the language
22260 doesn't allow it), and break the loop here. */
22261 name = dwarf2_name (die, cu);
22262 parent_name = dwarf2_name (parent, cu);
22263 complaint (&symfile_complaints,
22264 _("template param type '%s' defined within parent '%s'"),
22265 name ? name : "<unknown>",
22266 parent_name ? parent_name : "<unknown>");
22270 switch (parent->tag)
22272 case DW_TAG_namespace:
22273 parent_type = read_type_die (parent, cu);
22274 /* GCC 4.0 and 4.1 had a bug (PR c++/28460) where they generated bogus
22275 DW_TAG_namespace DIEs with a name of "::" for the global namespace.
22276 Work around this problem here. */
22277 if (cu->language == language_cplus
22278 && strcmp (TYPE_TAG_NAME (parent_type), "::") == 0)
22280 /* We give a name to even anonymous namespaces. */
22281 return TYPE_TAG_NAME (parent_type);
22282 case DW_TAG_class_type:
22283 case DW_TAG_interface_type:
22284 case DW_TAG_structure_type:
22285 case DW_TAG_union_type:
22286 case DW_TAG_module:
22287 parent_type = read_type_die (parent, cu);
22288 if (TYPE_TAG_NAME (parent_type) != NULL)
22289 return TYPE_TAG_NAME (parent_type);
22291 /* An anonymous structure is only allowed non-static data
22292 members; no typedefs, no member functions, et cetera.
22293 So it does not need a prefix. */
22295 case DW_TAG_compile_unit:
22296 case DW_TAG_partial_unit:
22297 /* gcc-4.5 -gdwarf-4 can drop the enclosing namespace. Cope. */
22298 if (cu->language == language_cplus
22299 && !VEC_empty (dwarf2_section_info_def, dwarf2_per_objfile->types)
22300 && die->child != NULL
22301 && (die->tag == DW_TAG_class_type
22302 || die->tag == DW_TAG_structure_type
22303 || die->tag == DW_TAG_union_type))
22305 char *name = guess_full_die_structure_name (die, cu);
22310 case DW_TAG_enumeration_type:
22311 parent_type = read_type_die (parent, cu);
22312 if (TYPE_DECLARED_CLASS (parent_type))
22314 if (TYPE_TAG_NAME (parent_type) != NULL)
22315 return TYPE_TAG_NAME (parent_type);
22318 /* Fall through. */
22320 return determine_prefix (parent, cu);
22324 /* Return a newly-allocated string formed by concatenating PREFIX and SUFFIX
22325 with appropriate separator. If PREFIX or SUFFIX is NULL or empty, then
22326 simply copy the SUFFIX or PREFIX, respectively. If OBS is non-null, perform
22327 an obconcat, otherwise allocate storage for the result. The CU argument is
22328 used to determine the language and hence, the appropriate separator. */
22330 #define MAX_SEP_LEN 7 /* strlen ("__") + strlen ("_MOD_") */
22333 typename_concat (struct obstack *obs, const char *prefix, const char *suffix,
22334 int physname, struct dwarf2_cu *cu)
22336 const char *lead = "";
22339 if (suffix == NULL || suffix[0] == '\0'
22340 || prefix == NULL || prefix[0] == '\0')
22342 else if (cu->language == language_d)
22344 /* For D, the 'main' function could be defined in any module, but it
22345 should never be prefixed. */
22346 if (strcmp (suffix, "D main") == 0)
22354 else if (cu->language == language_fortran && physname)
22356 /* This is gfortran specific mangling. Normally DW_AT_linkage_name or
22357 DW_AT_MIPS_linkage_name is preferred and used instead. */
22365 if (prefix == NULL)
22367 if (suffix == NULL)
22374 xmalloc (strlen (prefix) + MAX_SEP_LEN + strlen (suffix) + 1));
22376 strcpy (retval, lead);
22377 strcat (retval, prefix);
22378 strcat (retval, sep);
22379 strcat (retval, suffix);
22384 /* We have an obstack. */
22385 return obconcat (obs, lead, prefix, sep, suffix, (char *) NULL);
22389 /* Return sibling of die, NULL if no sibling. */
22391 static struct die_info *
22392 sibling_die (struct die_info *die)
22394 return die->sibling;
22397 /* Get name of a die, return NULL if not found. */
22399 static const char *
22400 dwarf2_canonicalize_name (const char *name, struct dwarf2_cu *cu,
22401 struct obstack *obstack)
22403 if (name && cu->language == language_cplus)
22405 std::string canon_name = cp_canonicalize_string (name);
22407 if (!canon_name.empty ())
22409 if (canon_name != name)
22410 name = (const char *) obstack_copy0 (obstack,
22411 canon_name.c_str (),
22412 canon_name.length ());
22419 /* Get name of a die, return NULL if not found.
22420 Anonymous namespaces are converted to their magic string. */
22422 static const char *
22423 dwarf2_name (struct die_info *die, struct dwarf2_cu *cu)
22425 struct attribute *attr;
22426 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
22428 attr = dwarf2_attr (die, DW_AT_name, cu);
22429 if ((!attr || !DW_STRING (attr))
22430 && die->tag != DW_TAG_namespace
22431 && die->tag != DW_TAG_class_type
22432 && die->tag != DW_TAG_interface_type
22433 && die->tag != DW_TAG_structure_type
22434 && die->tag != DW_TAG_union_type)
22439 case DW_TAG_compile_unit:
22440 case DW_TAG_partial_unit:
22441 /* Compilation units have a DW_AT_name that is a filename, not
22442 a source language identifier. */
22443 case DW_TAG_enumeration_type:
22444 case DW_TAG_enumerator:
22445 /* These tags always have simple identifiers already; no need
22446 to canonicalize them. */
22447 return DW_STRING (attr);
22449 case DW_TAG_namespace:
22450 if (attr != NULL && DW_STRING (attr) != NULL)
22451 return DW_STRING (attr);
22452 return CP_ANONYMOUS_NAMESPACE_STR;
22454 case DW_TAG_class_type:
22455 case DW_TAG_interface_type:
22456 case DW_TAG_structure_type:
22457 case DW_TAG_union_type:
22458 /* Some GCC versions emit spurious DW_AT_name attributes for unnamed
22459 structures or unions. These were of the form "._%d" in GCC 4.1,
22460 or simply "<anonymous struct>" or "<anonymous union>" in GCC 4.3
22461 and GCC 4.4. We work around this problem by ignoring these. */
22462 if (attr && DW_STRING (attr)
22463 && (startswith (DW_STRING (attr), "._")
22464 || startswith (DW_STRING (attr), "<anonymous")))
22467 /* GCC might emit a nameless typedef that has a linkage name. See
22468 http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47510. */
22469 if (!attr || DW_STRING (attr) == NULL)
22471 char *demangled = NULL;
22473 attr = dw2_linkage_name_attr (die, cu);
22474 if (attr == NULL || DW_STRING (attr) == NULL)
22477 /* Avoid demangling DW_STRING (attr) the second time on a second
22478 call for the same DIE. */
22479 if (!DW_STRING_IS_CANONICAL (attr))
22480 demangled = gdb_demangle (DW_STRING (attr), DMGL_TYPES);
22486 /* FIXME: we already did this for the partial symbol... */
22489 obstack_copy0 (&objfile->per_bfd->storage_obstack,
22490 demangled, strlen (demangled)));
22491 DW_STRING_IS_CANONICAL (attr) = 1;
22494 /* Strip any leading namespaces/classes, keep only the base name.
22495 DW_AT_name for named DIEs does not contain the prefixes. */
22496 base = strrchr (DW_STRING (attr), ':');
22497 if (base && base > DW_STRING (attr) && base[-1] == ':')
22500 return DW_STRING (attr);
22509 if (!DW_STRING_IS_CANONICAL (attr))
22512 = dwarf2_canonicalize_name (DW_STRING (attr), cu,
22513 &objfile->per_bfd->storage_obstack);
22514 DW_STRING_IS_CANONICAL (attr) = 1;
22516 return DW_STRING (attr);
22519 /* Return the die that this die in an extension of, or NULL if there
22520 is none. *EXT_CU is the CU containing DIE on input, and the CU
22521 containing the return value on output. */
22523 static struct die_info *
22524 dwarf2_extension (struct die_info *die, struct dwarf2_cu **ext_cu)
22526 struct attribute *attr;
22528 attr = dwarf2_attr (die, DW_AT_extension, *ext_cu);
22532 return follow_die_ref (die, attr, ext_cu);
22535 /* Convert a DIE tag into its string name. */
22537 static const char *
22538 dwarf_tag_name (unsigned tag)
22540 const char *name = get_DW_TAG_name (tag);
22543 return "DW_TAG_<unknown>";
22548 /* Convert a DWARF attribute code into its string name. */
22550 static const char *
22551 dwarf_attr_name (unsigned attr)
22555 #ifdef MIPS /* collides with DW_AT_HP_block_index */
22556 if (attr == DW_AT_MIPS_fde)
22557 return "DW_AT_MIPS_fde";
22559 if (attr == DW_AT_HP_block_index)
22560 return "DW_AT_HP_block_index";
22563 name = get_DW_AT_name (attr);
22566 return "DW_AT_<unknown>";
22571 /* Convert a DWARF value form code into its string name. */
22573 static const char *
22574 dwarf_form_name (unsigned form)
22576 const char *name = get_DW_FORM_name (form);
22579 return "DW_FORM_<unknown>";
22584 static const char *
22585 dwarf_bool_name (unsigned mybool)
22593 /* Convert a DWARF type code into its string name. */
22595 static const char *
22596 dwarf_type_encoding_name (unsigned enc)
22598 const char *name = get_DW_ATE_name (enc);
22601 return "DW_ATE_<unknown>";
22607 dump_die_shallow (struct ui_file *f, int indent, struct die_info *die)
22611 print_spaces (indent, f);
22612 fprintf_unfiltered (f, "Die: %s (abbrev %d, offset %s)\n",
22613 dwarf_tag_name (die->tag), die->abbrev,
22614 sect_offset_str (die->sect_off));
22616 if (die->parent != NULL)
22618 print_spaces (indent, f);
22619 fprintf_unfiltered (f, " parent at offset: %s\n",
22620 sect_offset_str (die->parent->sect_off));
22623 print_spaces (indent, f);
22624 fprintf_unfiltered (f, " has children: %s\n",
22625 dwarf_bool_name (die->child != NULL));
22627 print_spaces (indent, f);
22628 fprintf_unfiltered (f, " attributes:\n");
22630 for (i = 0; i < die->num_attrs; ++i)
22632 print_spaces (indent, f);
22633 fprintf_unfiltered (f, " %s (%s) ",
22634 dwarf_attr_name (die->attrs[i].name),
22635 dwarf_form_name (die->attrs[i].form));
22637 switch (die->attrs[i].form)
22640 case DW_FORM_GNU_addr_index:
22641 fprintf_unfiltered (f, "address: ");
22642 fputs_filtered (hex_string (DW_ADDR (&die->attrs[i])), f);
22644 case DW_FORM_block2:
22645 case DW_FORM_block4:
22646 case DW_FORM_block:
22647 case DW_FORM_block1:
22648 fprintf_unfiltered (f, "block: size %s",
22649 pulongest (DW_BLOCK (&die->attrs[i])->size));
22651 case DW_FORM_exprloc:
22652 fprintf_unfiltered (f, "expression: size %s",
22653 pulongest (DW_BLOCK (&die->attrs[i])->size));
22655 case DW_FORM_data16:
22656 fprintf_unfiltered (f, "constant of 16 bytes");
22658 case DW_FORM_ref_addr:
22659 fprintf_unfiltered (f, "ref address: ");
22660 fputs_filtered (hex_string (DW_UNSND (&die->attrs[i])), f);
22662 case DW_FORM_GNU_ref_alt:
22663 fprintf_unfiltered (f, "alt ref address: ");
22664 fputs_filtered (hex_string (DW_UNSND (&die->attrs[i])), f);
22670 case DW_FORM_ref_udata:
22671 fprintf_unfiltered (f, "constant ref: 0x%lx (adjusted)",
22672 (long) (DW_UNSND (&die->attrs[i])));
22674 case DW_FORM_data1:
22675 case DW_FORM_data2:
22676 case DW_FORM_data4:
22677 case DW_FORM_data8:
22678 case DW_FORM_udata:
22679 case DW_FORM_sdata:
22680 fprintf_unfiltered (f, "constant: %s",
22681 pulongest (DW_UNSND (&die->attrs[i])));
22683 case DW_FORM_sec_offset:
22684 fprintf_unfiltered (f, "section offset: %s",
22685 pulongest (DW_UNSND (&die->attrs[i])));
22687 case DW_FORM_ref_sig8:
22688 fprintf_unfiltered (f, "signature: %s",
22689 hex_string (DW_SIGNATURE (&die->attrs[i])));
22691 case DW_FORM_string:
22693 case DW_FORM_line_strp:
22694 case DW_FORM_GNU_str_index:
22695 case DW_FORM_GNU_strp_alt:
22696 fprintf_unfiltered (f, "string: \"%s\" (%s canonicalized)",
22697 DW_STRING (&die->attrs[i])
22698 ? DW_STRING (&die->attrs[i]) : "",
22699 DW_STRING_IS_CANONICAL (&die->attrs[i]) ? "is" : "not");
22702 if (DW_UNSND (&die->attrs[i]))
22703 fprintf_unfiltered (f, "flag: TRUE");
22705 fprintf_unfiltered (f, "flag: FALSE");
22707 case DW_FORM_flag_present:
22708 fprintf_unfiltered (f, "flag: TRUE");
22710 case DW_FORM_indirect:
22711 /* The reader will have reduced the indirect form to
22712 the "base form" so this form should not occur. */
22713 fprintf_unfiltered (f,
22714 "unexpected attribute form: DW_FORM_indirect");
22716 case DW_FORM_implicit_const:
22717 fprintf_unfiltered (f, "constant: %s",
22718 plongest (DW_SND (&die->attrs[i])));
22721 fprintf_unfiltered (f, "unsupported attribute form: %d.",
22722 die->attrs[i].form);
22725 fprintf_unfiltered (f, "\n");
22730 dump_die_for_error (struct die_info *die)
22732 dump_die_shallow (gdb_stderr, 0, die);
22736 dump_die_1 (struct ui_file *f, int level, int max_level, struct die_info *die)
22738 int indent = level * 4;
22740 gdb_assert (die != NULL);
22742 if (level >= max_level)
22745 dump_die_shallow (f, indent, die);
22747 if (die->child != NULL)
22749 print_spaces (indent, f);
22750 fprintf_unfiltered (f, " Children:");
22751 if (level + 1 < max_level)
22753 fprintf_unfiltered (f, "\n");
22754 dump_die_1 (f, level + 1, max_level, die->child);
22758 fprintf_unfiltered (f,
22759 " [not printed, max nesting level reached]\n");
22763 if (die->sibling != NULL && level > 0)
22765 dump_die_1 (f, level, max_level, die->sibling);
22769 /* This is called from the pdie macro in gdbinit.in.
22770 It's not static so gcc will keep a copy callable from gdb. */
22773 dump_die (struct die_info *die, int max_level)
22775 dump_die_1 (gdb_stdlog, 0, max_level, die);
22779 store_in_ref_table (struct die_info *die, struct dwarf2_cu *cu)
22783 slot = htab_find_slot_with_hash (cu->die_hash, die,
22784 to_underlying (die->sect_off),
22790 /* Return DIE offset of ATTR. Return 0 with complaint if ATTR is not of the
22794 dwarf2_get_ref_die_offset (const struct attribute *attr)
22796 if (attr_form_is_ref (attr))
22797 return (sect_offset) DW_UNSND (attr);
22799 complaint (&symfile_complaints,
22800 _("unsupported die ref attribute form: '%s'"),
22801 dwarf_form_name (attr->form));
22805 /* Return the constant value held by ATTR. Return DEFAULT_VALUE if
22806 * the value held by the attribute is not constant. */
22809 dwarf2_get_attr_constant_value (const struct attribute *attr, int default_value)
22811 if (attr->form == DW_FORM_sdata || attr->form == DW_FORM_implicit_const)
22812 return DW_SND (attr);
22813 else if (attr->form == DW_FORM_udata
22814 || attr->form == DW_FORM_data1
22815 || attr->form == DW_FORM_data2
22816 || attr->form == DW_FORM_data4
22817 || attr->form == DW_FORM_data8)
22818 return DW_UNSND (attr);
22821 /* For DW_FORM_data16 see attr_form_is_constant. */
22822 complaint (&symfile_complaints,
22823 _("Attribute value is not a constant (%s)"),
22824 dwarf_form_name (attr->form));
22825 return default_value;
22829 /* Follow reference or signature attribute ATTR of SRC_DIE.
22830 On entry *REF_CU is the CU of SRC_DIE.
22831 On exit *REF_CU is the CU of the result. */
22833 static struct die_info *
22834 follow_die_ref_or_sig (struct die_info *src_die, const struct attribute *attr,
22835 struct dwarf2_cu **ref_cu)
22837 struct die_info *die;
22839 if (attr_form_is_ref (attr))
22840 die = follow_die_ref (src_die, attr, ref_cu);
22841 else if (attr->form == DW_FORM_ref_sig8)
22842 die = follow_die_sig (src_die, attr, ref_cu);
22845 dump_die_for_error (src_die);
22846 error (_("Dwarf Error: Expected reference attribute [in module %s]"),
22847 objfile_name ((*ref_cu)->per_cu->dwarf2_per_objfile->objfile));
22853 /* Follow reference OFFSET.
22854 On entry *REF_CU is the CU of the source die referencing OFFSET.
22855 On exit *REF_CU is the CU of the result.
22856 Returns NULL if OFFSET is invalid. */
22858 static struct die_info *
22859 follow_die_offset (sect_offset sect_off, int offset_in_dwz,
22860 struct dwarf2_cu **ref_cu)
22862 struct die_info temp_die;
22863 struct dwarf2_cu *target_cu, *cu = *ref_cu;
22864 struct dwarf2_per_objfile *dwarf2_per_objfile
22865 = cu->per_cu->dwarf2_per_objfile;
22867 gdb_assert (cu->per_cu != NULL);
22871 if (cu->per_cu->is_debug_types)
22873 /* .debug_types CUs cannot reference anything outside their CU.
22874 If they need to, they have to reference a signatured type via
22875 DW_FORM_ref_sig8. */
22876 if (!offset_in_cu_p (&cu->header, sect_off))
22879 else if (offset_in_dwz != cu->per_cu->is_dwz
22880 || !offset_in_cu_p (&cu->header, sect_off))
22882 struct dwarf2_per_cu_data *per_cu;
22884 per_cu = dwarf2_find_containing_comp_unit (sect_off, offset_in_dwz,
22885 dwarf2_per_objfile);
22887 /* If necessary, add it to the queue and load its DIEs. */
22888 if (maybe_queue_comp_unit (cu, per_cu, cu->language))
22889 load_full_comp_unit (per_cu, false, cu->language);
22891 target_cu = per_cu->cu;
22893 else if (cu->dies == NULL)
22895 /* We're loading full DIEs during partial symbol reading. */
22896 gdb_assert (dwarf2_per_objfile->reading_partial_symbols);
22897 load_full_comp_unit (cu->per_cu, false, language_minimal);
22900 *ref_cu = target_cu;
22901 temp_die.sect_off = sect_off;
22902 return (struct die_info *) htab_find_with_hash (target_cu->die_hash,
22904 to_underlying (sect_off));
22907 /* Follow reference attribute ATTR of SRC_DIE.
22908 On entry *REF_CU is the CU of SRC_DIE.
22909 On exit *REF_CU is the CU of the result. */
22911 static struct die_info *
22912 follow_die_ref (struct die_info *src_die, const struct attribute *attr,
22913 struct dwarf2_cu **ref_cu)
22915 sect_offset sect_off = dwarf2_get_ref_die_offset (attr);
22916 struct dwarf2_cu *cu = *ref_cu;
22917 struct die_info *die;
22919 die = follow_die_offset (sect_off,
22920 (attr->form == DW_FORM_GNU_ref_alt
22921 || cu->per_cu->is_dwz),
22924 error (_("Dwarf Error: Cannot find DIE at %s referenced from DIE "
22925 "at %s [in module %s]"),
22926 sect_offset_str (sect_off), sect_offset_str (src_die->sect_off),
22927 objfile_name (cu->per_cu->dwarf2_per_objfile->objfile));
22932 /* Return DWARF block referenced by DW_AT_location of DIE at SECT_OFF at PER_CU.
22933 Returned value is intended for DW_OP_call*. Returned
22934 dwarf2_locexpr_baton->data has lifetime of
22935 PER_CU->DWARF2_PER_OBJFILE->OBJFILE. */
22937 struct dwarf2_locexpr_baton
22938 dwarf2_fetch_die_loc_sect_off (sect_offset sect_off,
22939 struct dwarf2_per_cu_data *per_cu,
22940 CORE_ADDR (*get_frame_pc) (void *baton),
22943 struct dwarf2_cu *cu;
22944 struct die_info *die;
22945 struct attribute *attr;
22946 struct dwarf2_locexpr_baton retval;
22947 struct dwarf2_per_objfile *dwarf2_per_objfile = per_cu->dwarf2_per_objfile;
22948 struct objfile *objfile = dwarf2_per_objfile->objfile;
22950 if (per_cu->cu == NULL)
22951 load_cu (per_cu, false);
22955 /* We shouldn't get here for a dummy CU, but don't crash on the user.
22956 Instead just throw an error, not much else we can do. */
22957 error (_("Dwarf Error: Dummy CU at %s referenced in module %s"),
22958 sect_offset_str (sect_off), objfile_name (objfile));
22961 die = follow_die_offset (sect_off, per_cu->is_dwz, &cu);
22963 error (_("Dwarf Error: Cannot find DIE at %s referenced in module %s"),
22964 sect_offset_str (sect_off), objfile_name (objfile));
22966 attr = dwarf2_attr (die, DW_AT_location, cu);
22969 /* DWARF: "If there is no such attribute, then there is no effect.".
22970 DATA is ignored if SIZE is 0. */
22972 retval.data = NULL;
22975 else if (attr_form_is_section_offset (attr))
22977 struct dwarf2_loclist_baton loclist_baton;
22978 CORE_ADDR pc = (*get_frame_pc) (baton);
22981 fill_in_loclist_baton (cu, &loclist_baton, attr);
22983 retval.data = dwarf2_find_location_expression (&loclist_baton,
22985 retval.size = size;
22989 if (!attr_form_is_block (attr))
22990 error (_("Dwarf Error: DIE at %s referenced in module %s "
22991 "is neither DW_FORM_block* nor DW_FORM_exprloc"),
22992 sect_offset_str (sect_off), objfile_name (objfile));
22994 retval.data = DW_BLOCK (attr)->data;
22995 retval.size = DW_BLOCK (attr)->size;
22997 retval.per_cu = cu->per_cu;
22999 age_cached_comp_units (dwarf2_per_objfile);
23004 /* Like dwarf2_fetch_die_loc_sect_off, but take a CU
23007 struct dwarf2_locexpr_baton
23008 dwarf2_fetch_die_loc_cu_off (cu_offset offset_in_cu,
23009 struct dwarf2_per_cu_data *per_cu,
23010 CORE_ADDR (*get_frame_pc) (void *baton),
23013 sect_offset sect_off = per_cu->sect_off + to_underlying (offset_in_cu);
23015 return dwarf2_fetch_die_loc_sect_off (sect_off, per_cu, get_frame_pc, baton);
23018 /* Write a constant of a given type as target-ordered bytes into
23021 static const gdb_byte *
23022 write_constant_as_bytes (struct obstack *obstack,
23023 enum bfd_endian byte_order,
23030 *len = TYPE_LENGTH (type);
23031 result = (gdb_byte *) obstack_alloc (obstack, *len);
23032 store_unsigned_integer (result, *len, byte_order, value);
23037 /* If the DIE at OFFSET in PER_CU has a DW_AT_const_value, return a
23038 pointer to the constant bytes and set LEN to the length of the
23039 data. If memory is needed, allocate it on OBSTACK. If the DIE
23040 does not have a DW_AT_const_value, return NULL. */
23043 dwarf2_fetch_constant_bytes (sect_offset sect_off,
23044 struct dwarf2_per_cu_data *per_cu,
23045 struct obstack *obstack,
23048 struct dwarf2_cu *cu;
23049 struct die_info *die;
23050 struct attribute *attr;
23051 const gdb_byte *result = NULL;
23054 enum bfd_endian byte_order;
23055 struct objfile *objfile = per_cu->dwarf2_per_objfile->objfile;
23057 if (per_cu->cu == NULL)
23058 load_cu (per_cu, false);
23062 /* We shouldn't get here for a dummy CU, but don't crash on the user.
23063 Instead just throw an error, not much else we can do. */
23064 error (_("Dwarf Error: Dummy CU at %s referenced in module %s"),
23065 sect_offset_str (sect_off), objfile_name (objfile));
23068 die = follow_die_offset (sect_off, per_cu->is_dwz, &cu);
23070 error (_("Dwarf Error: Cannot find DIE at %s referenced in module %s"),
23071 sect_offset_str (sect_off), objfile_name (objfile));
23073 attr = dwarf2_attr (die, DW_AT_const_value, cu);
23077 byte_order = (bfd_big_endian (objfile->obfd)
23078 ? BFD_ENDIAN_BIG : BFD_ENDIAN_LITTLE);
23080 switch (attr->form)
23083 case DW_FORM_GNU_addr_index:
23087 *len = cu->header.addr_size;
23088 tem = (gdb_byte *) obstack_alloc (obstack, *len);
23089 store_unsigned_integer (tem, *len, byte_order, DW_ADDR (attr));
23093 case DW_FORM_string:
23095 case DW_FORM_GNU_str_index:
23096 case DW_FORM_GNU_strp_alt:
23097 /* DW_STRING is already allocated on the objfile obstack, point
23099 result = (const gdb_byte *) DW_STRING (attr);
23100 *len = strlen (DW_STRING (attr));
23102 case DW_FORM_block1:
23103 case DW_FORM_block2:
23104 case DW_FORM_block4:
23105 case DW_FORM_block:
23106 case DW_FORM_exprloc:
23107 case DW_FORM_data16:
23108 result = DW_BLOCK (attr)->data;
23109 *len = DW_BLOCK (attr)->size;
23112 /* The DW_AT_const_value attributes are supposed to carry the
23113 symbol's value "represented as it would be on the target
23114 architecture." By the time we get here, it's already been
23115 converted to host endianness, so we just need to sign- or
23116 zero-extend it as appropriate. */
23117 case DW_FORM_data1:
23118 type = die_type (die, cu);
23119 result = dwarf2_const_value_data (attr, obstack, cu, &value, 8);
23120 if (result == NULL)
23121 result = write_constant_as_bytes (obstack, byte_order,
23124 case DW_FORM_data2:
23125 type = die_type (die, cu);
23126 result = dwarf2_const_value_data (attr, obstack, cu, &value, 16);
23127 if (result == NULL)
23128 result = write_constant_as_bytes (obstack, byte_order,
23131 case DW_FORM_data4:
23132 type = die_type (die, cu);
23133 result = dwarf2_const_value_data (attr, obstack, cu, &value, 32);
23134 if (result == NULL)
23135 result = write_constant_as_bytes (obstack, byte_order,
23138 case DW_FORM_data8:
23139 type = die_type (die, cu);
23140 result = dwarf2_const_value_data (attr, obstack, cu, &value, 64);
23141 if (result == NULL)
23142 result = write_constant_as_bytes (obstack, byte_order,
23146 case DW_FORM_sdata:
23147 case DW_FORM_implicit_const:
23148 type = die_type (die, cu);
23149 result = write_constant_as_bytes (obstack, byte_order,
23150 type, DW_SND (attr), len);
23153 case DW_FORM_udata:
23154 type = die_type (die, cu);
23155 result = write_constant_as_bytes (obstack, byte_order,
23156 type, DW_UNSND (attr), len);
23160 complaint (&symfile_complaints,
23161 _("unsupported const value attribute form: '%s'"),
23162 dwarf_form_name (attr->form));
23169 /* Return the type of the die at OFFSET in PER_CU. Return NULL if no
23170 valid type for this die is found. */
23173 dwarf2_fetch_die_type_sect_off (sect_offset sect_off,
23174 struct dwarf2_per_cu_data *per_cu)
23176 struct dwarf2_cu *cu;
23177 struct die_info *die;
23179 if (per_cu->cu == NULL)
23180 load_cu (per_cu, false);
23185 die = follow_die_offset (sect_off, per_cu->is_dwz, &cu);
23189 return die_type (die, cu);
23192 /* Return the type of the DIE at DIE_OFFSET in the CU named by
23196 dwarf2_get_die_type (cu_offset die_offset,
23197 struct dwarf2_per_cu_data *per_cu)
23199 sect_offset die_offset_sect = per_cu->sect_off + to_underlying (die_offset);
23200 return get_die_type_at_offset (die_offset_sect, per_cu);
23203 /* Follow type unit SIG_TYPE referenced by SRC_DIE.
23204 On entry *REF_CU is the CU of SRC_DIE.
23205 On exit *REF_CU is the CU of the result.
23206 Returns NULL if the referenced DIE isn't found. */
23208 static struct die_info *
23209 follow_die_sig_1 (struct die_info *src_die, struct signatured_type *sig_type,
23210 struct dwarf2_cu **ref_cu)
23212 struct die_info temp_die;
23213 struct dwarf2_cu *sig_cu;
23214 struct die_info *die;
23216 /* While it might be nice to assert sig_type->type == NULL here,
23217 we can get here for DW_AT_imported_declaration where we need
23218 the DIE not the type. */
23220 /* If necessary, add it to the queue and load its DIEs. */
23222 if (maybe_queue_comp_unit (*ref_cu, &sig_type->per_cu, language_minimal))
23223 read_signatured_type (sig_type);
23225 sig_cu = sig_type->per_cu.cu;
23226 gdb_assert (sig_cu != NULL);
23227 gdb_assert (to_underlying (sig_type->type_offset_in_section) != 0);
23228 temp_die.sect_off = sig_type->type_offset_in_section;
23229 die = (struct die_info *) htab_find_with_hash (sig_cu->die_hash, &temp_die,
23230 to_underlying (temp_die.sect_off));
23233 struct dwarf2_per_objfile *dwarf2_per_objfile
23234 = (*ref_cu)->per_cu->dwarf2_per_objfile;
23236 /* For .gdb_index version 7 keep track of included TUs.
23237 http://sourceware.org/bugzilla/show_bug.cgi?id=15021. */
23238 if (dwarf2_per_objfile->index_table != NULL
23239 && dwarf2_per_objfile->index_table->version <= 7)
23241 VEC_safe_push (dwarf2_per_cu_ptr,
23242 (*ref_cu)->per_cu->imported_symtabs,
23253 /* Follow signatured type referenced by ATTR in SRC_DIE.
23254 On entry *REF_CU is the CU of SRC_DIE.
23255 On exit *REF_CU is the CU of the result.
23256 The result is the DIE of the type.
23257 If the referenced type cannot be found an error is thrown. */
23259 static struct die_info *
23260 follow_die_sig (struct die_info *src_die, const struct attribute *attr,
23261 struct dwarf2_cu **ref_cu)
23263 ULONGEST signature = DW_SIGNATURE (attr);
23264 struct signatured_type *sig_type;
23265 struct die_info *die;
23267 gdb_assert (attr->form == DW_FORM_ref_sig8);
23269 sig_type = lookup_signatured_type (*ref_cu, signature);
23270 /* sig_type will be NULL if the signatured type is missing from
23272 if (sig_type == NULL)
23274 error (_("Dwarf Error: Cannot find signatured DIE %s referenced"
23275 " from DIE at %s [in module %s]"),
23276 hex_string (signature), sect_offset_str (src_die->sect_off),
23277 objfile_name ((*ref_cu)->per_cu->dwarf2_per_objfile->objfile));
23280 die = follow_die_sig_1 (src_die, sig_type, ref_cu);
23283 dump_die_for_error (src_die);
23284 error (_("Dwarf Error: Problem reading signatured DIE %s referenced"
23285 " from DIE at %s [in module %s]"),
23286 hex_string (signature), sect_offset_str (src_die->sect_off),
23287 objfile_name ((*ref_cu)->per_cu->dwarf2_per_objfile->objfile));
23293 /* Get the type specified by SIGNATURE referenced in DIE/CU,
23294 reading in and processing the type unit if necessary. */
23296 static struct type *
23297 get_signatured_type (struct die_info *die, ULONGEST signature,
23298 struct dwarf2_cu *cu)
23300 struct dwarf2_per_objfile *dwarf2_per_objfile
23301 = cu->per_cu->dwarf2_per_objfile;
23302 struct signatured_type *sig_type;
23303 struct dwarf2_cu *type_cu;
23304 struct die_info *type_die;
23307 sig_type = lookup_signatured_type (cu, signature);
23308 /* sig_type will be NULL if the signatured type is missing from
23310 if (sig_type == NULL)
23312 complaint (&symfile_complaints,
23313 _("Dwarf Error: Cannot find signatured DIE %s referenced"
23314 " from DIE at %s [in module %s]"),
23315 hex_string (signature), sect_offset_str (die->sect_off),
23316 objfile_name (dwarf2_per_objfile->objfile));
23317 return build_error_marker_type (cu, die);
23320 /* If we already know the type we're done. */
23321 if (sig_type->type != NULL)
23322 return sig_type->type;
23325 type_die = follow_die_sig_1 (die, sig_type, &type_cu);
23326 if (type_die != NULL)
23328 /* N.B. We need to call get_die_type to ensure only one type for this DIE
23329 is created. This is important, for example, because for c++ classes
23330 we need TYPE_NAME set which is only done by new_symbol. Blech. */
23331 type = read_type_die (type_die, type_cu);
23334 complaint (&symfile_complaints,
23335 _("Dwarf Error: Cannot build signatured type %s"
23336 " referenced from DIE at %s [in module %s]"),
23337 hex_string (signature), sect_offset_str (die->sect_off),
23338 objfile_name (dwarf2_per_objfile->objfile));
23339 type = build_error_marker_type (cu, die);
23344 complaint (&symfile_complaints,
23345 _("Dwarf Error: Problem reading signatured DIE %s referenced"
23346 " from DIE at %s [in module %s]"),
23347 hex_string (signature), sect_offset_str (die->sect_off),
23348 objfile_name (dwarf2_per_objfile->objfile));
23349 type = build_error_marker_type (cu, die);
23351 sig_type->type = type;
23356 /* Get the type specified by the DW_AT_signature ATTR in DIE/CU,
23357 reading in and processing the type unit if necessary. */
23359 static struct type *
23360 get_DW_AT_signature_type (struct die_info *die, const struct attribute *attr,
23361 struct dwarf2_cu *cu) /* ARI: editCase function */
23363 /* Yes, DW_AT_signature can use a non-ref_sig8 reference. */
23364 if (attr_form_is_ref (attr))
23366 struct dwarf2_cu *type_cu = cu;
23367 struct die_info *type_die = follow_die_ref (die, attr, &type_cu);
23369 return read_type_die (type_die, type_cu);
23371 else if (attr->form == DW_FORM_ref_sig8)
23373 return get_signatured_type (die, DW_SIGNATURE (attr), cu);
23377 struct dwarf2_per_objfile *dwarf2_per_objfile
23378 = cu->per_cu->dwarf2_per_objfile;
23380 complaint (&symfile_complaints,
23381 _("Dwarf Error: DW_AT_signature has bad form %s in DIE"
23382 " at %s [in module %s]"),
23383 dwarf_form_name (attr->form), sect_offset_str (die->sect_off),
23384 objfile_name (dwarf2_per_objfile->objfile));
23385 return build_error_marker_type (cu, die);
23389 /* Load the DIEs associated with type unit PER_CU into memory. */
23392 load_full_type_unit (struct dwarf2_per_cu_data *per_cu)
23394 struct signatured_type *sig_type;
23396 /* Caller is responsible for ensuring type_unit_groups don't get here. */
23397 gdb_assert (! IS_TYPE_UNIT_GROUP (per_cu));
23399 /* We have the per_cu, but we need the signatured_type.
23400 Fortunately this is an easy translation. */
23401 gdb_assert (per_cu->is_debug_types);
23402 sig_type = (struct signatured_type *) per_cu;
23404 gdb_assert (per_cu->cu == NULL);
23406 read_signatured_type (sig_type);
23408 gdb_assert (per_cu->cu != NULL);
23411 /* die_reader_func for read_signatured_type.
23412 This is identical to load_full_comp_unit_reader,
23413 but is kept separate for now. */
23416 read_signatured_type_reader (const struct die_reader_specs *reader,
23417 const gdb_byte *info_ptr,
23418 struct die_info *comp_unit_die,
23422 struct dwarf2_cu *cu = reader->cu;
23424 gdb_assert (cu->die_hash == NULL);
23426 htab_create_alloc_ex (cu->header.length / 12,
23430 &cu->comp_unit_obstack,
23431 hashtab_obstack_allocate,
23432 dummy_obstack_deallocate);
23435 comp_unit_die->child = read_die_and_siblings (reader, info_ptr,
23436 &info_ptr, comp_unit_die);
23437 cu->dies = comp_unit_die;
23438 /* comp_unit_die is not stored in die_hash, no need. */
23440 /* We try not to read any attributes in this function, because not
23441 all CUs needed for references have been loaded yet, and symbol
23442 table processing isn't initialized. But we have to set the CU language,
23443 or we won't be able to build types correctly.
23444 Similarly, if we do not read the producer, we can not apply
23445 producer-specific interpretation. */
23446 prepare_one_comp_unit (cu, cu->dies, language_minimal);
23449 /* Read in a signatured type and build its CU and DIEs.
23450 If the type is a stub for the real type in a DWO file,
23451 read in the real type from the DWO file as well. */
23454 read_signatured_type (struct signatured_type *sig_type)
23456 struct dwarf2_per_cu_data *per_cu = &sig_type->per_cu;
23458 gdb_assert (per_cu->is_debug_types);
23459 gdb_assert (per_cu->cu == NULL);
23461 init_cutu_and_read_dies (per_cu, NULL, 0, 1, false,
23462 read_signatured_type_reader, NULL);
23463 sig_type->per_cu.tu_read = 1;
23466 /* Decode simple location descriptions.
23467 Given a pointer to a dwarf block that defines a location, compute
23468 the location and return the value.
23470 NOTE drow/2003-11-18: This function is called in two situations
23471 now: for the address of static or global variables (partial symbols
23472 only) and for offsets into structures which are expected to be
23473 (more or less) constant. The partial symbol case should go away,
23474 and only the constant case should remain. That will let this
23475 function complain more accurately. A few special modes are allowed
23476 without complaint for global variables (for instance, global
23477 register values and thread-local values).
23479 A location description containing no operations indicates that the
23480 object is optimized out. The return value is 0 for that case.
23481 FIXME drow/2003-11-16: No callers check for this case any more; soon all
23482 callers will only want a very basic result and this can become a
23485 Note that stack[0] is unused except as a default error return. */
23488 decode_locdesc (struct dwarf_block *blk, struct dwarf2_cu *cu)
23490 struct objfile *objfile = cu->per_cu->dwarf2_per_objfile->objfile;
23492 size_t size = blk->size;
23493 const gdb_byte *data = blk->data;
23494 CORE_ADDR stack[64];
23496 unsigned int bytes_read, unsnd;
23502 stack[++stacki] = 0;
23541 stack[++stacki] = op - DW_OP_lit0;
23576 stack[++stacki] = op - DW_OP_reg0;
23578 dwarf2_complex_location_expr_complaint ();
23582 unsnd = read_unsigned_leb128 (NULL, (data + i), &bytes_read);
23584 stack[++stacki] = unsnd;
23586 dwarf2_complex_location_expr_complaint ();
23590 stack[++stacki] = read_address (objfile->obfd, &data[i],
23595 case DW_OP_const1u:
23596 stack[++stacki] = read_1_byte (objfile->obfd, &data[i]);
23600 case DW_OP_const1s:
23601 stack[++stacki] = read_1_signed_byte (objfile->obfd, &data[i]);
23605 case DW_OP_const2u:
23606 stack[++stacki] = read_2_bytes (objfile->obfd, &data[i]);
23610 case DW_OP_const2s:
23611 stack[++stacki] = read_2_signed_bytes (objfile->obfd, &data[i]);
23615 case DW_OP_const4u:
23616 stack[++stacki] = read_4_bytes (objfile->obfd, &data[i]);
23620 case DW_OP_const4s:
23621 stack[++stacki] = read_4_signed_bytes (objfile->obfd, &data[i]);
23625 case DW_OP_const8u:
23626 stack[++stacki] = read_8_bytes (objfile->obfd, &data[i]);
23631 stack[++stacki] = read_unsigned_leb128 (NULL, (data + i),
23637 stack[++stacki] = read_signed_leb128 (NULL, (data + i), &bytes_read);
23642 stack[stacki + 1] = stack[stacki];
23647 stack[stacki - 1] += stack[stacki];
23651 case DW_OP_plus_uconst:
23652 stack[stacki] += read_unsigned_leb128 (NULL, (data + i),
23658 stack[stacki - 1] -= stack[stacki];
23663 /* If we're not the last op, then we definitely can't encode
23664 this using GDB's address_class enum. This is valid for partial
23665 global symbols, although the variable's address will be bogus
23668 dwarf2_complex_location_expr_complaint ();
23671 case DW_OP_GNU_push_tls_address:
23672 case DW_OP_form_tls_address:
23673 /* The top of the stack has the offset from the beginning
23674 of the thread control block at which the variable is located. */
23675 /* Nothing should follow this operator, so the top of stack would
23677 /* This is valid for partial global symbols, but the variable's
23678 address will be bogus in the psymtab. Make it always at least
23679 non-zero to not look as a variable garbage collected by linker
23680 which have DW_OP_addr 0. */
23682 dwarf2_complex_location_expr_complaint ();
23686 case DW_OP_GNU_uninit:
23689 case DW_OP_GNU_addr_index:
23690 case DW_OP_GNU_const_index:
23691 stack[++stacki] = read_addr_index_from_leb128 (cu, &data[i],
23698 const char *name = get_DW_OP_name (op);
23701 complaint (&symfile_complaints, _("unsupported stack op: '%s'"),
23704 complaint (&symfile_complaints, _("unsupported stack op: '%02x'"),
23708 return (stack[stacki]);
23711 /* Enforce maximum stack depth of SIZE-1 to avoid writing
23712 outside of the allocated space. Also enforce minimum>0. */
23713 if (stacki >= ARRAY_SIZE (stack) - 1)
23715 complaint (&symfile_complaints,
23716 _("location description stack overflow"));
23722 complaint (&symfile_complaints,
23723 _("location description stack underflow"));
23727 return (stack[stacki]);
23730 /* memory allocation interface */
23732 static struct dwarf_block *
23733 dwarf_alloc_block (struct dwarf2_cu *cu)
23735 return XOBNEW (&cu->comp_unit_obstack, struct dwarf_block);
23738 static struct die_info *
23739 dwarf_alloc_die (struct dwarf2_cu *cu, int num_attrs)
23741 struct die_info *die;
23742 size_t size = sizeof (struct die_info);
23745 size += (num_attrs - 1) * sizeof (struct attribute);
23747 die = (struct die_info *) obstack_alloc (&cu->comp_unit_obstack, size);
23748 memset (die, 0, sizeof (struct die_info));
23753 /* Macro support. */
23755 /* Return file name relative to the compilation directory of file number I in
23756 *LH's file name table. The result is allocated using xmalloc; the caller is
23757 responsible for freeing it. */
23760 file_file_name (int file, struct line_header *lh)
23762 /* Is the file number a valid index into the line header's file name
23763 table? Remember that file numbers start with one, not zero. */
23764 if (1 <= file && file <= lh->file_names.size ())
23766 const file_entry &fe = lh->file_names[file - 1];
23768 if (!IS_ABSOLUTE_PATH (fe.name))
23770 const char *dir = fe.include_dir (lh);
23772 return concat (dir, SLASH_STRING, fe.name, (char *) NULL);
23774 return xstrdup (fe.name);
23778 /* The compiler produced a bogus file number. We can at least
23779 record the macro definitions made in the file, even if we
23780 won't be able to find the file by name. */
23781 char fake_name[80];
23783 xsnprintf (fake_name, sizeof (fake_name),
23784 "<bad macro file number %d>", file);
23786 complaint (&symfile_complaints,
23787 _("bad file number in macro information (%d)"),
23790 return xstrdup (fake_name);
23794 /* Return the full name of file number I in *LH's file name table.
23795 Use COMP_DIR as the name of the current directory of the
23796 compilation. The result is allocated using xmalloc; the caller is
23797 responsible for freeing it. */
23799 file_full_name (int file, struct line_header *lh, const char *comp_dir)
23801 /* Is the file number a valid index into the line header's file name
23802 table? Remember that file numbers start with one, not zero. */
23803 if (1 <= file && file <= lh->file_names.size ())
23805 char *relative = file_file_name (file, lh);
23807 if (IS_ABSOLUTE_PATH (relative) || comp_dir == NULL)
23809 return reconcat (relative, comp_dir, SLASH_STRING,
23810 relative, (char *) NULL);
23813 return file_file_name (file, lh);
23817 static struct macro_source_file *
23818 macro_start_file (int file, int line,
23819 struct macro_source_file *current_file,
23820 struct line_header *lh)
23822 /* File name relative to the compilation directory of this source file. */
23823 char *file_name = file_file_name (file, lh);
23825 if (! current_file)
23827 /* Note: We don't create a macro table for this compilation unit
23828 at all until we actually get a filename. */
23829 struct macro_table *macro_table = get_macro_table ();
23831 /* If we have no current file, then this must be the start_file
23832 directive for the compilation unit's main source file. */
23833 current_file = macro_set_main (macro_table, file_name);
23834 macro_define_special (macro_table);
23837 current_file = macro_include (current_file, line, file_name);
23841 return current_file;
23844 static const char *
23845 consume_improper_spaces (const char *p, const char *body)
23849 complaint (&symfile_complaints,
23850 _("macro definition contains spaces "
23851 "in formal argument list:\n`%s'"),
23863 parse_macro_definition (struct macro_source_file *file, int line,
23868 /* The body string takes one of two forms. For object-like macro
23869 definitions, it should be:
23871 <macro name> " " <definition>
23873 For function-like macro definitions, it should be:
23875 <macro name> "() " <definition>
23877 <macro name> "(" <arg name> ( "," <arg name> ) * ") " <definition>
23879 Spaces may appear only where explicitly indicated, and in the
23882 The Dwarf 2 spec says that an object-like macro's name is always
23883 followed by a space, but versions of GCC around March 2002 omit
23884 the space when the macro's definition is the empty string.
23886 The Dwarf 2 spec says that there should be no spaces between the
23887 formal arguments in a function-like macro's formal argument list,
23888 but versions of GCC around March 2002 include spaces after the
23892 /* Find the extent of the macro name. The macro name is terminated
23893 by either a space or null character (for an object-like macro) or
23894 an opening paren (for a function-like macro). */
23895 for (p = body; *p; p++)
23896 if (*p == ' ' || *p == '(')
23899 if (*p == ' ' || *p == '\0')
23901 /* It's an object-like macro. */
23902 int name_len = p - body;
23903 char *name = savestring (body, name_len);
23904 const char *replacement;
23907 replacement = body + name_len + 1;
23910 dwarf2_macro_malformed_definition_complaint (body);
23911 replacement = body + name_len;
23914 macro_define_object (file, line, name, replacement);
23918 else if (*p == '(')
23920 /* It's a function-like macro. */
23921 char *name = savestring (body, p - body);
23924 char **argv = XNEWVEC (char *, argv_size);
23928 p = consume_improper_spaces (p, body);
23930 /* Parse the formal argument list. */
23931 while (*p && *p != ')')
23933 /* Find the extent of the current argument name. */
23934 const char *arg_start = p;
23936 while (*p && *p != ',' && *p != ')' && *p != ' ')
23939 if (! *p || p == arg_start)
23940 dwarf2_macro_malformed_definition_complaint (body);
23943 /* Make sure argv has room for the new argument. */
23944 if (argc >= argv_size)
23947 argv = XRESIZEVEC (char *, argv, argv_size);
23950 argv[argc++] = savestring (arg_start, p - arg_start);
23953 p = consume_improper_spaces (p, body);
23955 /* Consume the comma, if present. */
23960 p = consume_improper_spaces (p, body);
23969 /* Perfectly formed definition, no complaints. */
23970 macro_define_function (file, line, name,
23971 argc, (const char **) argv,
23973 else if (*p == '\0')
23975 /* Complain, but do define it. */
23976 dwarf2_macro_malformed_definition_complaint (body);
23977 macro_define_function (file, line, name,
23978 argc, (const char **) argv,
23982 /* Just complain. */
23983 dwarf2_macro_malformed_definition_complaint (body);
23986 /* Just complain. */
23987 dwarf2_macro_malformed_definition_complaint (body);
23993 for (i = 0; i < argc; i++)
23999 dwarf2_macro_malformed_definition_complaint (body);
24002 /* Skip some bytes from BYTES according to the form given in FORM.
24003 Returns the new pointer. */
24005 static const gdb_byte *
24006 skip_form_bytes (bfd *abfd, const gdb_byte *bytes, const gdb_byte *buffer_end,
24007 enum dwarf_form form,
24008 unsigned int offset_size,
24009 struct dwarf2_section_info *section)
24011 unsigned int bytes_read;
24015 case DW_FORM_data1:
24020 case DW_FORM_data2:
24024 case DW_FORM_data4:
24028 case DW_FORM_data8:
24032 case DW_FORM_data16:
24036 case DW_FORM_string:
24037 read_direct_string (abfd, bytes, &bytes_read);
24038 bytes += bytes_read;
24041 case DW_FORM_sec_offset:
24043 case DW_FORM_GNU_strp_alt:
24044 bytes += offset_size;
24047 case DW_FORM_block:
24048 bytes += read_unsigned_leb128 (abfd, bytes, &bytes_read);
24049 bytes += bytes_read;
24052 case DW_FORM_block1:
24053 bytes += 1 + read_1_byte (abfd, bytes);
24055 case DW_FORM_block2:
24056 bytes += 2 + read_2_bytes (abfd, bytes);
24058 case DW_FORM_block4:
24059 bytes += 4 + read_4_bytes (abfd, bytes);
24062 case DW_FORM_sdata:
24063 case DW_FORM_udata:
24064 case DW_FORM_GNU_addr_index:
24065 case DW_FORM_GNU_str_index:
24066 bytes = gdb_skip_leb128 (bytes, buffer_end);
24069 dwarf2_section_buffer_overflow_complaint (section);
24074 case DW_FORM_implicit_const:
24079 complaint (&symfile_complaints,
24080 _("invalid form 0x%x in `%s'"),
24081 form, get_section_name (section));
24089 /* A helper for dwarf_decode_macros that handles skipping an unknown
24090 opcode. Returns an updated pointer to the macro data buffer; or,
24091 on error, issues a complaint and returns NULL. */
24093 static const gdb_byte *
24094 skip_unknown_opcode (unsigned int opcode,
24095 const gdb_byte **opcode_definitions,
24096 const gdb_byte *mac_ptr, const gdb_byte *mac_end,
24098 unsigned int offset_size,
24099 struct dwarf2_section_info *section)
24101 unsigned int bytes_read, i;
24103 const gdb_byte *defn;
24105 if (opcode_definitions[opcode] == NULL)
24107 complaint (&symfile_complaints,
24108 _("unrecognized DW_MACFINO opcode 0x%x"),
24113 defn = opcode_definitions[opcode];
24114 arg = read_unsigned_leb128 (abfd, defn, &bytes_read);
24115 defn += bytes_read;
24117 for (i = 0; i < arg; ++i)
24119 mac_ptr = skip_form_bytes (abfd, mac_ptr, mac_end,
24120 (enum dwarf_form) defn[i], offset_size,
24122 if (mac_ptr == NULL)
24124 /* skip_form_bytes already issued the complaint. */
24132 /* A helper function which parses the header of a macro section.
24133 If the macro section is the extended (for now called "GNU") type,
24134 then this updates *OFFSET_SIZE. Returns a pointer to just after
24135 the header, or issues a complaint and returns NULL on error. */
24137 static const gdb_byte *
24138 dwarf_parse_macro_header (const gdb_byte **opcode_definitions,
24140 const gdb_byte *mac_ptr,
24141 unsigned int *offset_size,
24142 int section_is_gnu)
24144 memset (opcode_definitions, 0, 256 * sizeof (gdb_byte *));
24146 if (section_is_gnu)
24148 unsigned int version, flags;
24150 version = read_2_bytes (abfd, mac_ptr);
24151 if (version != 4 && version != 5)
24153 complaint (&symfile_complaints,
24154 _("unrecognized version `%d' in .debug_macro section"),
24160 flags = read_1_byte (abfd, mac_ptr);
24162 *offset_size = (flags & 1) ? 8 : 4;
24164 if ((flags & 2) != 0)
24165 /* We don't need the line table offset. */
24166 mac_ptr += *offset_size;
24168 /* Vendor opcode descriptions. */
24169 if ((flags & 4) != 0)
24171 unsigned int i, count;
24173 count = read_1_byte (abfd, mac_ptr);
24175 for (i = 0; i < count; ++i)
24177 unsigned int opcode, bytes_read;
24180 opcode = read_1_byte (abfd, mac_ptr);
24182 opcode_definitions[opcode] = mac_ptr;
24183 arg = read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
24184 mac_ptr += bytes_read;
24193 /* A helper for dwarf_decode_macros that handles the GNU extensions,
24194 including DW_MACRO_import. */
24197 dwarf_decode_macro_bytes (struct dwarf2_per_objfile *dwarf2_per_objfile,
24199 const gdb_byte *mac_ptr, const gdb_byte *mac_end,
24200 struct macro_source_file *current_file,
24201 struct line_header *lh,
24202 struct dwarf2_section_info *section,
24203 int section_is_gnu, int section_is_dwz,
24204 unsigned int offset_size,
24205 htab_t include_hash)
24207 struct objfile *objfile = dwarf2_per_objfile->objfile;
24208 enum dwarf_macro_record_type macinfo_type;
24209 int at_commandline;
24210 const gdb_byte *opcode_definitions[256];
24212 mac_ptr = dwarf_parse_macro_header (opcode_definitions, abfd, mac_ptr,
24213 &offset_size, section_is_gnu);
24214 if (mac_ptr == NULL)
24216 /* We already issued a complaint. */
24220 /* Determines if GDB is still before first DW_MACINFO_start_file. If true
24221 GDB is still reading the definitions from command line. First
24222 DW_MACINFO_start_file will need to be ignored as it was already executed
24223 to create CURRENT_FILE for the main source holding also the command line
24224 definitions. On first met DW_MACINFO_start_file this flag is reset to
24225 normally execute all the remaining DW_MACINFO_start_file macinfos. */
24227 at_commandline = 1;
24231 /* Do we at least have room for a macinfo type byte? */
24232 if (mac_ptr >= mac_end)
24234 dwarf2_section_buffer_overflow_complaint (section);
24238 macinfo_type = (enum dwarf_macro_record_type) read_1_byte (abfd, mac_ptr);
24241 /* Note that we rely on the fact that the corresponding GNU and
24242 DWARF constants are the same. */
24244 DIAGNOSTIC_IGNORE_SWITCH_DIFFERENT_ENUM_TYPES
24245 switch (macinfo_type)
24247 /* A zero macinfo type indicates the end of the macro
24252 case DW_MACRO_define:
24253 case DW_MACRO_undef:
24254 case DW_MACRO_define_strp:
24255 case DW_MACRO_undef_strp:
24256 case DW_MACRO_define_sup:
24257 case DW_MACRO_undef_sup:
24259 unsigned int bytes_read;
24264 line = read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
24265 mac_ptr += bytes_read;
24267 if (macinfo_type == DW_MACRO_define
24268 || macinfo_type == DW_MACRO_undef)
24270 body = read_direct_string (abfd, mac_ptr, &bytes_read);
24271 mac_ptr += bytes_read;
24275 LONGEST str_offset;
24277 str_offset = read_offset_1 (abfd, mac_ptr, offset_size);
24278 mac_ptr += offset_size;
24280 if (macinfo_type == DW_MACRO_define_sup
24281 || macinfo_type == DW_MACRO_undef_sup
24284 struct dwz_file *dwz
24285 = dwarf2_get_dwz_file (dwarf2_per_objfile);
24287 body = read_indirect_string_from_dwz (objfile,
24291 body = read_indirect_string_at_offset (dwarf2_per_objfile,
24295 is_define = (macinfo_type == DW_MACRO_define
24296 || macinfo_type == DW_MACRO_define_strp
24297 || macinfo_type == DW_MACRO_define_sup);
24298 if (! current_file)
24300 /* DWARF violation as no main source is present. */
24301 complaint (&symfile_complaints,
24302 _("debug info with no main source gives macro %s "
24304 is_define ? _("definition") : _("undefinition"),
24308 if ((line == 0 && !at_commandline)
24309 || (line != 0 && at_commandline))
24310 complaint (&symfile_complaints,
24311 _("debug info gives %s macro %s with %s line %d: %s"),
24312 at_commandline ? _("command-line") : _("in-file"),
24313 is_define ? _("definition") : _("undefinition"),
24314 line == 0 ? _("zero") : _("non-zero"), line, body);
24317 parse_macro_definition (current_file, line, body);
24320 gdb_assert (macinfo_type == DW_MACRO_undef
24321 || macinfo_type == DW_MACRO_undef_strp
24322 || macinfo_type == DW_MACRO_undef_sup);
24323 macro_undef (current_file, line, body);
24328 case DW_MACRO_start_file:
24330 unsigned int bytes_read;
24333 line = read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
24334 mac_ptr += bytes_read;
24335 file = read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
24336 mac_ptr += bytes_read;
24338 if ((line == 0 && !at_commandline)
24339 || (line != 0 && at_commandline))
24340 complaint (&symfile_complaints,
24341 _("debug info gives source %d included "
24342 "from %s at %s line %d"),
24343 file, at_commandline ? _("command-line") : _("file"),
24344 line == 0 ? _("zero") : _("non-zero"), line);
24346 if (at_commandline)
24348 /* This DW_MACRO_start_file was executed in the
24350 at_commandline = 0;
24353 current_file = macro_start_file (file, line, current_file, lh);
24357 case DW_MACRO_end_file:
24358 if (! current_file)
24359 complaint (&symfile_complaints,
24360 _("macro debug info has an unmatched "
24361 "`close_file' directive"));
24364 current_file = current_file->included_by;
24365 if (! current_file)
24367 enum dwarf_macro_record_type next_type;
24369 /* GCC circa March 2002 doesn't produce the zero
24370 type byte marking the end of the compilation
24371 unit. Complain if it's not there, but exit no
24374 /* Do we at least have room for a macinfo type byte? */
24375 if (mac_ptr >= mac_end)
24377 dwarf2_section_buffer_overflow_complaint (section);
24381 /* We don't increment mac_ptr here, so this is just
24384 = (enum dwarf_macro_record_type) read_1_byte (abfd,
24386 if (next_type != 0)
24387 complaint (&symfile_complaints,
24388 _("no terminating 0-type entry for "
24389 "macros in `.debug_macinfo' section"));
24396 case DW_MACRO_import:
24397 case DW_MACRO_import_sup:
24401 bfd *include_bfd = abfd;
24402 struct dwarf2_section_info *include_section = section;
24403 const gdb_byte *include_mac_end = mac_end;
24404 int is_dwz = section_is_dwz;
24405 const gdb_byte *new_mac_ptr;
24407 offset = read_offset_1 (abfd, mac_ptr, offset_size);
24408 mac_ptr += offset_size;
24410 if (macinfo_type == DW_MACRO_import_sup)
24412 struct dwz_file *dwz = dwarf2_get_dwz_file (dwarf2_per_objfile);
24414 dwarf2_read_section (objfile, &dwz->macro);
24416 include_section = &dwz->macro;
24417 include_bfd = get_section_bfd_owner (include_section);
24418 include_mac_end = dwz->macro.buffer + dwz->macro.size;
24422 new_mac_ptr = include_section->buffer + offset;
24423 slot = htab_find_slot (include_hash, new_mac_ptr, INSERT);
24427 /* This has actually happened; see
24428 http://sourceware.org/bugzilla/show_bug.cgi?id=13568. */
24429 complaint (&symfile_complaints,
24430 _("recursive DW_MACRO_import in "
24431 ".debug_macro section"));
24435 *slot = (void *) new_mac_ptr;
24437 dwarf_decode_macro_bytes (dwarf2_per_objfile,
24438 include_bfd, new_mac_ptr,
24439 include_mac_end, current_file, lh,
24440 section, section_is_gnu, is_dwz,
24441 offset_size, include_hash);
24443 htab_remove_elt (include_hash, (void *) new_mac_ptr);
24448 case DW_MACINFO_vendor_ext:
24449 if (!section_is_gnu)
24451 unsigned int bytes_read;
24453 /* This reads the constant, but since we don't recognize
24454 any vendor extensions, we ignore it. */
24455 read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
24456 mac_ptr += bytes_read;
24457 read_direct_string (abfd, mac_ptr, &bytes_read);
24458 mac_ptr += bytes_read;
24460 /* We don't recognize any vendor extensions. */
24466 mac_ptr = skip_unknown_opcode (macinfo_type, opcode_definitions,
24467 mac_ptr, mac_end, abfd, offset_size,
24469 if (mac_ptr == NULL)
24474 } while (macinfo_type != 0);
24478 dwarf_decode_macros (struct dwarf2_cu *cu, unsigned int offset,
24479 int section_is_gnu)
24481 struct dwarf2_per_objfile *dwarf2_per_objfile
24482 = cu->per_cu->dwarf2_per_objfile;
24483 struct objfile *objfile = dwarf2_per_objfile->objfile;
24484 struct line_header *lh = cu->line_header;
24486 const gdb_byte *mac_ptr, *mac_end;
24487 struct macro_source_file *current_file = 0;
24488 enum dwarf_macro_record_type macinfo_type;
24489 unsigned int offset_size = cu->header.offset_size;
24490 const gdb_byte *opcode_definitions[256];
24492 struct dwarf2_section_info *section;
24493 const char *section_name;
24495 if (cu->dwo_unit != NULL)
24497 if (section_is_gnu)
24499 section = &cu->dwo_unit->dwo_file->sections.macro;
24500 section_name = ".debug_macro.dwo";
24504 section = &cu->dwo_unit->dwo_file->sections.macinfo;
24505 section_name = ".debug_macinfo.dwo";
24510 if (section_is_gnu)
24512 section = &dwarf2_per_objfile->macro;
24513 section_name = ".debug_macro";
24517 section = &dwarf2_per_objfile->macinfo;
24518 section_name = ".debug_macinfo";
24522 dwarf2_read_section (objfile, section);
24523 if (section->buffer == NULL)
24525 complaint (&symfile_complaints, _("missing %s section"), section_name);
24528 abfd = get_section_bfd_owner (section);
24530 /* First pass: Find the name of the base filename.
24531 This filename is needed in order to process all macros whose definition
24532 (or undefinition) comes from the command line. These macros are defined
24533 before the first DW_MACINFO_start_file entry, and yet still need to be
24534 associated to the base file.
24536 To determine the base file name, we scan the macro definitions until we
24537 reach the first DW_MACINFO_start_file entry. We then initialize
24538 CURRENT_FILE accordingly so that any macro definition found before the
24539 first DW_MACINFO_start_file can still be associated to the base file. */
24541 mac_ptr = section->buffer + offset;
24542 mac_end = section->buffer + section->size;
24544 mac_ptr = dwarf_parse_macro_header (opcode_definitions, abfd, mac_ptr,
24545 &offset_size, section_is_gnu);
24546 if (mac_ptr == NULL)
24548 /* We already issued a complaint. */
24554 /* Do we at least have room for a macinfo type byte? */
24555 if (mac_ptr >= mac_end)
24557 /* Complaint is printed during the second pass as GDB will probably
24558 stop the first pass earlier upon finding
24559 DW_MACINFO_start_file. */
24563 macinfo_type = (enum dwarf_macro_record_type) read_1_byte (abfd, mac_ptr);
24566 /* Note that we rely on the fact that the corresponding GNU and
24567 DWARF constants are the same. */
24569 DIAGNOSTIC_IGNORE_SWITCH_DIFFERENT_ENUM_TYPES
24570 switch (macinfo_type)
24572 /* A zero macinfo type indicates the end of the macro
24577 case DW_MACRO_define:
24578 case DW_MACRO_undef:
24579 /* Only skip the data by MAC_PTR. */
24581 unsigned int bytes_read;
24583 read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
24584 mac_ptr += bytes_read;
24585 read_direct_string (abfd, mac_ptr, &bytes_read);
24586 mac_ptr += bytes_read;
24590 case DW_MACRO_start_file:
24592 unsigned int bytes_read;
24595 line = read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
24596 mac_ptr += bytes_read;
24597 file = read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
24598 mac_ptr += bytes_read;
24600 current_file = macro_start_file (file, line, current_file, lh);
24604 case DW_MACRO_end_file:
24605 /* No data to skip by MAC_PTR. */
24608 case DW_MACRO_define_strp:
24609 case DW_MACRO_undef_strp:
24610 case DW_MACRO_define_sup:
24611 case DW_MACRO_undef_sup:
24613 unsigned int bytes_read;
24615 read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
24616 mac_ptr += bytes_read;
24617 mac_ptr += offset_size;
24621 case DW_MACRO_import:
24622 case DW_MACRO_import_sup:
24623 /* Note that, according to the spec, a transparent include
24624 chain cannot call DW_MACRO_start_file. So, we can just
24625 skip this opcode. */
24626 mac_ptr += offset_size;
24629 case DW_MACINFO_vendor_ext:
24630 /* Only skip the data by MAC_PTR. */
24631 if (!section_is_gnu)
24633 unsigned int bytes_read;
24635 read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
24636 mac_ptr += bytes_read;
24637 read_direct_string (abfd, mac_ptr, &bytes_read);
24638 mac_ptr += bytes_read;
24643 mac_ptr = skip_unknown_opcode (macinfo_type, opcode_definitions,
24644 mac_ptr, mac_end, abfd, offset_size,
24646 if (mac_ptr == NULL)
24651 } while (macinfo_type != 0 && current_file == NULL);
24653 /* Second pass: Process all entries.
24655 Use the AT_COMMAND_LINE flag to determine whether we are still processing
24656 command-line macro definitions/undefinitions. This flag is unset when we
24657 reach the first DW_MACINFO_start_file entry. */
24659 htab_up include_hash (htab_create_alloc (1, htab_hash_pointer,
24661 NULL, xcalloc, xfree));
24662 mac_ptr = section->buffer + offset;
24663 slot = htab_find_slot (include_hash.get (), mac_ptr, INSERT);
24664 *slot = (void *) mac_ptr;
24665 dwarf_decode_macro_bytes (dwarf2_per_objfile,
24666 abfd, mac_ptr, mac_end,
24667 current_file, lh, section,
24668 section_is_gnu, 0, offset_size,
24669 include_hash.get ());
24672 /* Check if the attribute's form is a DW_FORM_block*
24673 if so return true else false. */
24676 attr_form_is_block (const struct attribute *attr)
24678 return (attr == NULL ? 0 :
24679 attr->form == DW_FORM_block1
24680 || attr->form == DW_FORM_block2
24681 || attr->form == DW_FORM_block4
24682 || attr->form == DW_FORM_block
24683 || attr->form == DW_FORM_exprloc);
24686 /* Return non-zero if ATTR's value is a section offset --- classes
24687 lineptr, loclistptr, macptr or rangelistptr --- or zero, otherwise.
24688 You may use DW_UNSND (attr) to retrieve such offsets.
24690 Section 7.5.4, "Attribute Encodings", explains that no attribute
24691 may have a value that belongs to more than one of these classes; it
24692 would be ambiguous if we did, because we use the same forms for all
24696 attr_form_is_section_offset (const struct attribute *attr)
24698 return (attr->form == DW_FORM_data4
24699 || attr->form == DW_FORM_data8
24700 || attr->form == DW_FORM_sec_offset);
24703 /* Return non-zero if ATTR's value falls in the 'constant' class, or
24704 zero otherwise. When this function returns true, you can apply
24705 dwarf2_get_attr_constant_value to it.
24707 However, note that for some attributes you must check
24708 attr_form_is_section_offset before using this test. DW_FORM_data4
24709 and DW_FORM_data8 are members of both the constant class, and of
24710 the classes that contain offsets into other debug sections
24711 (lineptr, loclistptr, macptr or rangelistptr). The DWARF spec says
24712 that, if an attribute's can be either a constant or one of the
24713 section offset classes, DW_FORM_data4 and DW_FORM_data8 should be
24714 taken as section offsets, not constants.
24716 DW_FORM_data16 is not considered as dwarf2_get_attr_constant_value
24717 cannot handle that. */
24720 attr_form_is_constant (const struct attribute *attr)
24722 switch (attr->form)
24724 case DW_FORM_sdata:
24725 case DW_FORM_udata:
24726 case DW_FORM_data1:
24727 case DW_FORM_data2:
24728 case DW_FORM_data4:
24729 case DW_FORM_data8:
24730 case DW_FORM_implicit_const:
24738 /* DW_ADDR is always stored already as sect_offset; despite for the forms
24739 besides DW_FORM_ref_addr it is stored as cu_offset in the DWARF file. */
24742 attr_form_is_ref (const struct attribute *attr)
24744 switch (attr->form)
24746 case DW_FORM_ref_addr:
24751 case DW_FORM_ref_udata:
24752 case DW_FORM_GNU_ref_alt:
24759 /* Return the .debug_loc section to use for CU.
24760 For DWO files use .debug_loc.dwo. */
24762 static struct dwarf2_section_info *
24763 cu_debug_loc_section (struct dwarf2_cu *cu)
24765 struct dwarf2_per_objfile *dwarf2_per_objfile
24766 = cu->per_cu->dwarf2_per_objfile;
24770 struct dwo_sections *sections = &cu->dwo_unit->dwo_file->sections;
24772 return cu->header.version >= 5 ? §ions->loclists : §ions->loc;
24774 return (cu->header.version >= 5 ? &dwarf2_per_objfile->loclists
24775 : &dwarf2_per_objfile->loc);
24778 /* A helper function that fills in a dwarf2_loclist_baton. */
24781 fill_in_loclist_baton (struct dwarf2_cu *cu,
24782 struct dwarf2_loclist_baton *baton,
24783 const struct attribute *attr)
24785 struct dwarf2_per_objfile *dwarf2_per_objfile
24786 = cu->per_cu->dwarf2_per_objfile;
24787 struct dwarf2_section_info *section = cu_debug_loc_section (cu);
24789 dwarf2_read_section (dwarf2_per_objfile->objfile, section);
24791 baton->per_cu = cu->per_cu;
24792 gdb_assert (baton->per_cu);
24793 /* We don't know how long the location list is, but make sure we
24794 don't run off the edge of the section. */
24795 baton->size = section->size - DW_UNSND (attr);
24796 baton->data = section->buffer + DW_UNSND (attr);
24797 baton->base_address = cu->base_address;
24798 baton->from_dwo = cu->dwo_unit != NULL;
24802 dwarf2_symbol_mark_computed (const struct attribute *attr, struct symbol *sym,
24803 struct dwarf2_cu *cu, int is_block)
24805 struct dwarf2_per_objfile *dwarf2_per_objfile
24806 = cu->per_cu->dwarf2_per_objfile;
24807 struct objfile *objfile = dwarf2_per_objfile->objfile;
24808 struct dwarf2_section_info *section = cu_debug_loc_section (cu);
24810 if (attr_form_is_section_offset (attr)
24811 /* .debug_loc{,.dwo} may not exist at all, or the offset may be outside
24812 the section. If so, fall through to the complaint in the
24814 && DW_UNSND (attr) < dwarf2_section_size (objfile, section))
24816 struct dwarf2_loclist_baton *baton;
24818 baton = XOBNEW (&objfile->objfile_obstack, struct dwarf2_loclist_baton);
24820 fill_in_loclist_baton (cu, baton, attr);
24822 if (cu->base_known == 0)
24823 complaint (&symfile_complaints,
24824 _("Location list used without "
24825 "specifying the CU base address."));
24827 SYMBOL_ACLASS_INDEX (sym) = (is_block
24828 ? dwarf2_loclist_block_index
24829 : dwarf2_loclist_index);
24830 SYMBOL_LOCATION_BATON (sym) = baton;
24834 struct dwarf2_locexpr_baton *baton;
24836 baton = XOBNEW (&objfile->objfile_obstack, struct dwarf2_locexpr_baton);
24837 baton->per_cu = cu->per_cu;
24838 gdb_assert (baton->per_cu);
24840 if (attr_form_is_block (attr))
24842 /* Note that we're just copying the block's data pointer
24843 here, not the actual data. We're still pointing into the
24844 info_buffer for SYM's objfile; right now we never release
24845 that buffer, but when we do clean up properly this may
24847 baton->size = DW_BLOCK (attr)->size;
24848 baton->data = DW_BLOCK (attr)->data;
24852 dwarf2_invalid_attrib_class_complaint ("location description",
24853 SYMBOL_NATURAL_NAME (sym));
24857 SYMBOL_ACLASS_INDEX (sym) = (is_block
24858 ? dwarf2_locexpr_block_index
24859 : dwarf2_locexpr_index);
24860 SYMBOL_LOCATION_BATON (sym) = baton;
24864 /* Return the OBJFILE associated with the compilation unit CU. If CU
24865 came from a separate debuginfo file, then the master objfile is
24869 dwarf2_per_cu_objfile (struct dwarf2_per_cu_data *per_cu)
24871 struct objfile *objfile = per_cu->dwarf2_per_objfile->objfile;
24873 /* Return the master objfile, so that we can report and look up the
24874 correct file containing this variable. */
24875 if (objfile->separate_debug_objfile_backlink)
24876 objfile = objfile->separate_debug_objfile_backlink;
24881 /* Return comp_unit_head for PER_CU, either already available in PER_CU->CU
24882 (CU_HEADERP is unused in such case) or prepare a temporary copy at
24883 CU_HEADERP first. */
24885 static const struct comp_unit_head *
24886 per_cu_header_read_in (struct comp_unit_head *cu_headerp,
24887 struct dwarf2_per_cu_data *per_cu)
24889 const gdb_byte *info_ptr;
24892 return &per_cu->cu->header;
24894 info_ptr = per_cu->section->buffer + to_underlying (per_cu->sect_off);
24896 memset (cu_headerp, 0, sizeof (*cu_headerp));
24897 read_comp_unit_head (cu_headerp, info_ptr, per_cu->section,
24898 rcuh_kind::COMPILE);
24903 /* Return the address size given in the compilation unit header for CU. */
24906 dwarf2_per_cu_addr_size (struct dwarf2_per_cu_data *per_cu)
24908 struct comp_unit_head cu_header_local;
24909 const struct comp_unit_head *cu_headerp;
24911 cu_headerp = per_cu_header_read_in (&cu_header_local, per_cu);
24913 return cu_headerp->addr_size;
24916 /* Return the offset size given in the compilation unit header for CU. */
24919 dwarf2_per_cu_offset_size (struct dwarf2_per_cu_data *per_cu)
24921 struct comp_unit_head cu_header_local;
24922 const struct comp_unit_head *cu_headerp;
24924 cu_headerp = per_cu_header_read_in (&cu_header_local, per_cu);
24926 return cu_headerp->offset_size;
24929 /* See its dwarf2loc.h declaration. */
24932 dwarf2_per_cu_ref_addr_size (struct dwarf2_per_cu_data *per_cu)
24934 struct comp_unit_head cu_header_local;
24935 const struct comp_unit_head *cu_headerp;
24937 cu_headerp = per_cu_header_read_in (&cu_header_local, per_cu);
24939 if (cu_headerp->version == 2)
24940 return cu_headerp->addr_size;
24942 return cu_headerp->offset_size;
24945 /* Return the text offset of the CU. The returned offset comes from
24946 this CU's objfile. If this objfile came from a separate debuginfo
24947 file, then the offset may be different from the corresponding
24948 offset in the parent objfile. */
24951 dwarf2_per_cu_text_offset (struct dwarf2_per_cu_data *per_cu)
24953 struct objfile *objfile = per_cu->dwarf2_per_objfile->objfile;
24955 return ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
24958 /* Return DWARF version number of PER_CU. */
24961 dwarf2_version (struct dwarf2_per_cu_data *per_cu)
24963 return per_cu->dwarf_version;
24966 /* Locate the .debug_info compilation unit from CU's objfile which contains
24967 the DIE at OFFSET. Raises an error on failure. */
24969 static struct dwarf2_per_cu_data *
24970 dwarf2_find_containing_comp_unit (sect_offset sect_off,
24971 unsigned int offset_in_dwz,
24972 struct dwarf2_per_objfile *dwarf2_per_objfile)
24974 struct dwarf2_per_cu_data *this_cu;
24976 const sect_offset *cu_off;
24979 high = dwarf2_per_objfile->all_comp_units.size () - 1;
24982 struct dwarf2_per_cu_data *mid_cu;
24983 int mid = low + (high - low) / 2;
24985 mid_cu = dwarf2_per_objfile->all_comp_units[mid];
24986 cu_off = &mid_cu->sect_off;
24987 if (mid_cu->is_dwz > offset_in_dwz
24988 || (mid_cu->is_dwz == offset_in_dwz && *cu_off >= sect_off))
24993 gdb_assert (low == high);
24994 this_cu = dwarf2_per_objfile->all_comp_units[low];
24995 cu_off = &this_cu->sect_off;
24996 if (this_cu->is_dwz != offset_in_dwz || *cu_off > sect_off)
24998 if (low == 0 || this_cu->is_dwz != offset_in_dwz)
24999 error (_("Dwarf Error: could not find partial DIE containing "
25000 "offset %s [in module %s]"),
25001 sect_offset_str (sect_off),
25002 bfd_get_filename (dwarf2_per_objfile->objfile->obfd));
25004 gdb_assert (dwarf2_per_objfile->all_comp_units[low-1]->sect_off
25006 return dwarf2_per_objfile->all_comp_units[low-1];
25010 this_cu = dwarf2_per_objfile->all_comp_units[low];
25011 if (low == dwarf2_per_objfile->all_comp_units.size () - 1
25012 && sect_off >= this_cu->sect_off + this_cu->length)
25013 error (_("invalid dwarf2 offset %s"), sect_offset_str (sect_off));
25014 gdb_assert (sect_off < this_cu->sect_off + this_cu->length);
25019 /* Initialize dwarf2_cu CU, owned by PER_CU. */
25021 dwarf2_cu::dwarf2_cu (struct dwarf2_per_cu_data *per_cu_)
25022 : per_cu (per_cu_),
25025 checked_producer (0),
25026 producer_is_gxx_lt_4_6 (0),
25027 producer_is_gcc_lt_4_3 (0),
25028 producer_is_icc_lt_14 (0),
25029 processing_has_namespace_info (0)
25034 /* Destroy a dwarf2_cu. */
25036 dwarf2_cu::~dwarf2_cu ()
25041 /* Initialize basic fields of dwarf_cu CU according to DIE COMP_UNIT_DIE. */
25044 prepare_one_comp_unit (struct dwarf2_cu *cu, struct die_info *comp_unit_die,
25045 enum language pretend_language)
25047 struct attribute *attr;
25049 /* Set the language we're debugging. */
25050 attr = dwarf2_attr (comp_unit_die, DW_AT_language, cu);
25052 set_cu_language (DW_UNSND (attr), cu);
25055 cu->language = pretend_language;
25056 cu->language_defn = language_def (cu->language);
25059 cu->producer = dwarf2_string_attr (comp_unit_die, DW_AT_producer, cu);
25062 /* Increase the age counter on each cached compilation unit, and free
25063 any that are too old. */
25066 age_cached_comp_units (struct dwarf2_per_objfile *dwarf2_per_objfile)
25068 struct dwarf2_per_cu_data *per_cu, **last_chain;
25070 dwarf2_clear_marks (dwarf2_per_objfile->read_in_chain);
25071 per_cu = dwarf2_per_objfile->read_in_chain;
25072 while (per_cu != NULL)
25074 per_cu->cu->last_used ++;
25075 if (per_cu->cu->last_used <= dwarf_max_cache_age)
25076 dwarf2_mark (per_cu->cu);
25077 per_cu = per_cu->cu->read_in_chain;
25080 per_cu = dwarf2_per_objfile->read_in_chain;
25081 last_chain = &dwarf2_per_objfile->read_in_chain;
25082 while (per_cu != NULL)
25084 struct dwarf2_per_cu_data *next_cu;
25086 next_cu = per_cu->cu->read_in_chain;
25088 if (!per_cu->cu->mark)
25091 *last_chain = next_cu;
25094 last_chain = &per_cu->cu->read_in_chain;
25100 /* Remove a single compilation unit from the cache. */
25103 free_one_cached_comp_unit (struct dwarf2_per_cu_data *target_per_cu)
25105 struct dwarf2_per_cu_data *per_cu, **last_chain;
25106 struct dwarf2_per_objfile *dwarf2_per_objfile
25107 = target_per_cu->dwarf2_per_objfile;
25109 per_cu = dwarf2_per_objfile->read_in_chain;
25110 last_chain = &dwarf2_per_objfile->read_in_chain;
25111 while (per_cu != NULL)
25113 struct dwarf2_per_cu_data *next_cu;
25115 next_cu = per_cu->cu->read_in_chain;
25117 if (per_cu == target_per_cu)
25121 *last_chain = next_cu;
25125 last_chain = &per_cu->cu->read_in_chain;
25131 /* Release all extra memory associated with OBJFILE. */
25134 dwarf2_free_objfile (struct objfile *objfile)
25136 struct dwarf2_per_objfile *dwarf2_per_objfile
25137 = get_dwarf2_per_objfile (objfile);
25139 delete dwarf2_per_objfile;
25142 /* A set of CU "per_cu" pointer, DIE offset, and GDB type pointer.
25143 We store these in a hash table separate from the DIEs, and preserve them
25144 when the DIEs are flushed out of cache.
25146 The CU "per_cu" pointer is needed because offset alone is not enough to
25147 uniquely identify the type. A file may have multiple .debug_types sections,
25148 or the type may come from a DWO file. Furthermore, while it's more logical
25149 to use per_cu->section+offset, with Fission the section with the data is in
25150 the DWO file but we don't know that section at the point we need it.
25151 We have to use something in dwarf2_per_cu_data (or the pointer to it)
25152 because we can enter the lookup routine, get_die_type_at_offset, from
25153 outside this file, and thus won't necessarily have PER_CU->cu.
25154 Fortunately, PER_CU is stable for the life of the objfile. */
25156 struct dwarf2_per_cu_offset_and_type
25158 const struct dwarf2_per_cu_data *per_cu;
25159 sect_offset sect_off;
25163 /* Hash function for a dwarf2_per_cu_offset_and_type. */
25166 per_cu_offset_and_type_hash (const void *item)
25168 const struct dwarf2_per_cu_offset_and_type *ofs
25169 = (const struct dwarf2_per_cu_offset_and_type *) item;
25171 return (uintptr_t) ofs->per_cu + to_underlying (ofs->sect_off);
25174 /* Equality function for a dwarf2_per_cu_offset_and_type. */
25177 per_cu_offset_and_type_eq (const void *item_lhs, const void *item_rhs)
25179 const struct dwarf2_per_cu_offset_and_type *ofs_lhs
25180 = (const struct dwarf2_per_cu_offset_and_type *) item_lhs;
25181 const struct dwarf2_per_cu_offset_and_type *ofs_rhs
25182 = (const struct dwarf2_per_cu_offset_and_type *) item_rhs;
25184 return (ofs_lhs->per_cu == ofs_rhs->per_cu
25185 && ofs_lhs->sect_off == ofs_rhs->sect_off);
25188 /* Set the type associated with DIE to TYPE. Save it in CU's hash
25189 table if necessary. For convenience, return TYPE.
25191 The DIEs reading must have careful ordering to:
25192 * Not cause infite loops trying to read in DIEs as a prerequisite for
25193 reading current DIE.
25194 * Not trying to dereference contents of still incompletely read in types
25195 while reading in other DIEs.
25196 * Enable referencing still incompletely read in types just by a pointer to
25197 the type without accessing its fields.
25199 Therefore caller should follow these rules:
25200 * Try to fetch any prerequisite types we may need to build this DIE type
25201 before building the type and calling set_die_type.
25202 * After building type call set_die_type for current DIE as soon as
25203 possible before fetching more types to complete the current type.
25204 * Make the type as complete as possible before fetching more types. */
25206 static struct type *
25207 set_die_type (struct die_info *die, struct type *type, struct dwarf2_cu *cu)
25209 struct dwarf2_per_objfile *dwarf2_per_objfile
25210 = cu->per_cu->dwarf2_per_objfile;
25211 struct dwarf2_per_cu_offset_and_type **slot, ofs;
25212 struct objfile *objfile = dwarf2_per_objfile->objfile;
25213 struct attribute *attr;
25214 struct dynamic_prop prop;
25216 /* For Ada types, make sure that the gnat-specific data is always
25217 initialized (if not already set). There are a few types where
25218 we should not be doing so, because the type-specific area is
25219 already used to hold some other piece of info (eg: TYPE_CODE_FLT
25220 where the type-specific area is used to store the floatformat).
25221 But this is not a problem, because the gnat-specific information
25222 is actually not needed for these types. */
25223 if (need_gnat_info (cu)
25224 && TYPE_CODE (type) != TYPE_CODE_FUNC
25225 && TYPE_CODE (type) != TYPE_CODE_FLT
25226 && TYPE_CODE (type) != TYPE_CODE_METHODPTR
25227 && TYPE_CODE (type) != TYPE_CODE_MEMBERPTR
25228 && TYPE_CODE (type) != TYPE_CODE_METHOD
25229 && !HAVE_GNAT_AUX_INFO (type))
25230 INIT_GNAT_SPECIFIC (type);
25232 /* Read DW_AT_allocated and set in type. */
25233 attr = dwarf2_attr (die, DW_AT_allocated, cu);
25234 if (attr_form_is_block (attr))
25236 if (attr_to_dynamic_prop (attr, die, cu, &prop))
25237 add_dyn_prop (DYN_PROP_ALLOCATED, prop, type);
25239 else if (attr != NULL)
25241 complaint (&symfile_complaints,
25242 _("DW_AT_allocated has the wrong form (%s) at DIE %s"),
25243 (attr != NULL ? dwarf_form_name (attr->form) : "n/a"),
25244 sect_offset_str (die->sect_off));
25247 /* Read DW_AT_associated and set in type. */
25248 attr = dwarf2_attr (die, DW_AT_associated, cu);
25249 if (attr_form_is_block (attr))
25251 if (attr_to_dynamic_prop (attr, die, cu, &prop))
25252 add_dyn_prop (DYN_PROP_ASSOCIATED, prop, type);
25254 else if (attr != NULL)
25256 complaint (&symfile_complaints,
25257 _("DW_AT_associated has the wrong form (%s) at DIE %s"),
25258 (attr != NULL ? dwarf_form_name (attr->form) : "n/a"),
25259 sect_offset_str (die->sect_off));
25262 /* Read DW_AT_data_location and set in type. */
25263 attr = dwarf2_attr (die, DW_AT_data_location, cu);
25264 if (attr_to_dynamic_prop (attr, die, cu, &prop))
25265 add_dyn_prop (DYN_PROP_DATA_LOCATION, prop, type);
25267 if (dwarf2_per_objfile->die_type_hash == NULL)
25269 dwarf2_per_objfile->die_type_hash =
25270 htab_create_alloc_ex (127,
25271 per_cu_offset_and_type_hash,
25272 per_cu_offset_and_type_eq,
25274 &objfile->objfile_obstack,
25275 hashtab_obstack_allocate,
25276 dummy_obstack_deallocate);
25279 ofs.per_cu = cu->per_cu;
25280 ofs.sect_off = die->sect_off;
25282 slot = (struct dwarf2_per_cu_offset_and_type **)
25283 htab_find_slot (dwarf2_per_objfile->die_type_hash, &ofs, INSERT);
25285 complaint (&symfile_complaints,
25286 _("A problem internal to GDB: DIE %s has type already set"),
25287 sect_offset_str (die->sect_off));
25288 *slot = XOBNEW (&objfile->objfile_obstack,
25289 struct dwarf2_per_cu_offset_and_type);
25294 /* Look up the type for the die at SECT_OFF in PER_CU in die_type_hash,
25295 or return NULL if the die does not have a saved type. */
25297 static struct type *
25298 get_die_type_at_offset (sect_offset sect_off,
25299 struct dwarf2_per_cu_data *per_cu)
25301 struct dwarf2_per_cu_offset_and_type *slot, ofs;
25302 struct dwarf2_per_objfile *dwarf2_per_objfile = per_cu->dwarf2_per_objfile;
25304 if (dwarf2_per_objfile->die_type_hash == NULL)
25307 ofs.per_cu = per_cu;
25308 ofs.sect_off = sect_off;
25309 slot = ((struct dwarf2_per_cu_offset_and_type *)
25310 htab_find (dwarf2_per_objfile->die_type_hash, &ofs));
25317 /* Look up the type for DIE in CU in die_type_hash,
25318 or return NULL if DIE does not have a saved type. */
25320 static struct type *
25321 get_die_type (struct die_info *die, struct dwarf2_cu *cu)
25323 return get_die_type_at_offset (die->sect_off, cu->per_cu);
25326 /* Add a dependence relationship from CU to REF_PER_CU. */
25329 dwarf2_add_dependence (struct dwarf2_cu *cu,
25330 struct dwarf2_per_cu_data *ref_per_cu)
25334 if (cu->dependencies == NULL)
25336 = htab_create_alloc_ex (5, htab_hash_pointer, htab_eq_pointer,
25337 NULL, &cu->comp_unit_obstack,
25338 hashtab_obstack_allocate,
25339 dummy_obstack_deallocate);
25341 slot = htab_find_slot (cu->dependencies, ref_per_cu, INSERT);
25343 *slot = ref_per_cu;
25346 /* Subroutine of dwarf2_mark to pass to htab_traverse.
25347 Set the mark field in every compilation unit in the
25348 cache that we must keep because we are keeping CU. */
25351 dwarf2_mark_helper (void **slot, void *data)
25353 struct dwarf2_per_cu_data *per_cu;
25355 per_cu = (struct dwarf2_per_cu_data *) *slot;
25357 /* cu->dependencies references may not yet have been ever read if QUIT aborts
25358 reading of the chain. As such dependencies remain valid it is not much
25359 useful to track and undo them during QUIT cleanups. */
25360 if (per_cu->cu == NULL)
25363 if (per_cu->cu->mark)
25365 per_cu->cu->mark = 1;
25367 if (per_cu->cu->dependencies != NULL)
25368 htab_traverse (per_cu->cu->dependencies, dwarf2_mark_helper, NULL);
25373 /* Set the mark field in CU and in every other compilation unit in the
25374 cache that we must keep because we are keeping CU. */
25377 dwarf2_mark (struct dwarf2_cu *cu)
25382 if (cu->dependencies != NULL)
25383 htab_traverse (cu->dependencies, dwarf2_mark_helper, NULL);
25387 dwarf2_clear_marks (struct dwarf2_per_cu_data *per_cu)
25391 per_cu->cu->mark = 0;
25392 per_cu = per_cu->cu->read_in_chain;
25396 /* Trivial hash function for partial_die_info: the hash value of a DIE
25397 is its offset in .debug_info for this objfile. */
25400 partial_die_hash (const void *item)
25402 const struct partial_die_info *part_die
25403 = (const struct partial_die_info *) item;
25405 return to_underlying (part_die->sect_off);
25408 /* Trivial comparison function for partial_die_info structures: two DIEs
25409 are equal if they have the same offset. */
25412 partial_die_eq (const void *item_lhs, const void *item_rhs)
25414 const struct partial_die_info *part_die_lhs
25415 = (const struct partial_die_info *) item_lhs;
25416 const struct partial_die_info *part_die_rhs
25417 = (const struct partial_die_info *) item_rhs;
25419 return part_die_lhs->sect_off == part_die_rhs->sect_off;
25422 static struct cmd_list_element *set_dwarf_cmdlist;
25423 static struct cmd_list_element *show_dwarf_cmdlist;
25426 set_dwarf_cmd (const char *args, int from_tty)
25428 help_list (set_dwarf_cmdlist, "maintenance set dwarf ", all_commands,
25433 show_dwarf_cmd (const char *args, int from_tty)
25435 cmd_show_list (show_dwarf_cmdlist, from_tty, "");
25438 int dwarf_always_disassemble;
25441 show_dwarf_always_disassemble (struct ui_file *file, int from_tty,
25442 struct cmd_list_element *c, const char *value)
25444 fprintf_filtered (file,
25445 _("Whether to always disassemble "
25446 "DWARF expressions is %s.\n"),
25451 show_check_physname (struct ui_file *file, int from_tty,
25452 struct cmd_list_element *c, const char *value)
25454 fprintf_filtered (file,
25455 _("Whether to check \"physname\" is %s.\n"),
25460 _initialize_dwarf2_read (void)
25463 dwarf2_objfile_data_key = register_objfile_data ();
25465 add_prefix_cmd ("dwarf", class_maintenance, set_dwarf_cmd, _("\
25466 Set DWARF specific variables.\n\
25467 Configure DWARF variables such as the cache size"),
25468 &set_dwarf_cmdlist, "maintenance set dwarf ",
25469 0/*allow-unknown*/, &maintenance_set_cmdlist);
25471 add_prefix_cmd ("dwarf", class_maintenance, show_dwarf_cmd, _("\
25472 Show DWARF specific variables\n\
25473 Show DWARF variables such as the cache size"),
25474 &show_dwarf_cmdlist, "maintenance show dwarf ",
25475 0/*allow-unknown*/, &maintenance_show_cmdlist);
25477 add_setshow_zinteger_cmd ("max-cache-age", class_obscure,
25478 &dwarf_max_cache_age, _("\
25479 Set the upper bound on the age of cached DWARF compilation units."), _("\
25480 Show the upper bound on the age of cached DWARF compilation units."), _("\
25481 A higher limit means that cached compilation units will be stored\n\
25482 in memory longer, and more total memory will be used. Zero disables\n\
25483 caching, which can slow down startup."),
25485 show_dwarf_max_cache_age,
25486 &set_dwarf_cmdlist,
25487 &show_dwarf_cmdlist);
25489 add_setshow_boolean_cmd ("always-disassemble", class_obscure,
25490 &dwarf_always_disassemble, _("\
25491 Set whether `info address' always disassembles DWARF expressions."), _("\
25492 Show whether `info address' always disassembles DWARF expressions."), _("\
25493 When enabled, DWARF expressions are always printed in an assembly-like\n\
25494 syntax. When disabled, expressions will be printed in a more\n\
25495 conversational style, when possible."),
25497 show_dwarf_always_disassemble,
25498 &set_dwarf_cmdlist,
25499 &show_dwarf_cmdlist);
25501 add_setshow_zuinteger_cmd ("dwarf-read", no_class, &dwarf_read_debug, _("\
25502 Set debugging of the DWARF reader."), _("\
25503 Show debugging of the DWARF reader."), _("\
25504 When enabled (non-zero), debugging messages are printed during DWARF\n\
25505 reading and symtab expansion. A value of 1 (one) provides basic\n\
25506 information. A value greater than 1 provides more verbose information."),
25509 &setdebuglist, &showdebuglist);
25511 add_setshow_zuinteger_cmd ("dwarf-die", no_class, &dwarf_die_debug, _("\
25512 Set debugging of the DWARF DIE reader."), _("\
25513 Show debugging of the DWARF DIE reader."), _("\
25514 When enabled (non-zero), DIEs are dumped after they are read in.\n\
25515 The value is the maximum depth to print."),
25518 &setdebuglist, &showdebuglist);
25520 add_setshow_zuinteger_cmd ("dwarf-line", no_class, &dwarf_line_debug, _("\
25521 Set debugging of the dwarf line reader."), _("\
25522 Show debugging of the dwarf line reader."), _("\
25523 When enabled (non-zero), line number entries are dumped as they are read in.\n\
25524 A value of 1 (one) provides basic information.\n\
25525 A value greater than 1 provides more verbose information."),
25528 &setdebuglist, &showdebuglist);
25530 add_setshow_boolean_cmd ("check-physname", no_class, &check_physname, _("\
25531 Set cross-checking of \"physname\" code against demangler."), _("\
25532 Show cross-checking of \"physname\" code against demangler."), _("\
25533 When enabled, GDB's internal \"physname\" code is checked against\n\
25535 NULL, show_check_physname,
25536 &setdebuglist, &showdebuglist);
25538 add_setshow_boolean_cmd ("use-deprecated-index-sections",
25539 no_class, &use_deprecated_index_sections, _("\
25540 Set whether to use deprecated gdb_index sections."), _("\
25541 Show whether to use deprecated gdb_index sections."), _("\
25542 When enabled, deprecated .gdb_index sections are used anyway.\n\
25543 Normally they are ignored either because of a missing feature or\n\
25544 performance issue.\n\
25545 Warning: This option must be enabled before gdb reads the file."),
25548 &setlist, &showlist);
25550 dwarf2_locexpr_index = register_symbol_computed_impl (LOC_COMPUTED,
25551 &dwarf2_locexpr_funcs);
25552 dwarf2_loclist_index = register_symbol_computed_impl (LOC_COMPUTED,
25553 &dwarf2_loclist_funcs);
25555 dwarf2_locexpr_block_index = register_symbol_block_impl (LOC_BLOCK,
25556 &dwarf2_block_frame_base_locexpr_funcs);
25557 dwarf2_loclist_block_index = register_symbol_block_impl (LOC_BLOCK,
25558 &dwarf2_block_frame_base_loclist_funcs);
25561 selftests::register_test ("dw2_expand_symtabs_matching",
25562 selftests::dw2_expand_symtabs_matching::run_test);