1 /* DWARF 2 debugging format support for GDB.
3 Copyright (C) 1994-2017 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. */
40 #include "gdb-demangle.h"
41 #include "expression.h"
42 #include "filenames.h" /* for DOSish file names */
45 #include "complaints.h"
47 #include "dwarf2expr.h"
48 #include "dwarf2loc.h"
49 #include "cp-support.h"
55 #include "typeprint.h"
58 #include "completer.h"
63 #include "gdbcore.h" /* for gnutarget */
64 #include "gdb/gdb-index.h"
69 #include "filestuff.h"
71 #include "namespace.h"
72 #include "common/gdb_unlinker.h"
73 #include "common/function-view.h"
74 #include "common/gdb_optional.h"
75 #include "common/underlying.h"
76 #include "common/byte-vector.h"
77 #include "common/hash_enum.h"
78 #include "filename-seen-cache.h"
81 #include <sys/types.h>
83 #include <unordered_set>
84 #include <unordered_map>
88 #include <forward_list>
90 typedef struct symbol *symbolp;
93 /* When == 1, print basic high level tracing messages.
94 When > 1, be more verbose.
95 This is in contrast to the low level DIE reading of dwarf_die_debug. */
96 static unsigned int dwarf_read_debug = 0;
98 /* When non-zero, dump DIEs after they are read in. */
99 static unsigned int dwarf_die_debug = 0;
101 /* When non-zero, dump line number entries as they are read in. */
102 static unsigned int dwarf_line_debug = 0;
104 /* When non-zero, cross-check physname against demangler. */
105 static int check_physname = 0;
107 /* When non-zero, do not reject deprecated .gdb_index sections. */
108 static int use_deprecated_index_sections = 0;
110 static const struct objfile_data *dwarf2_objfile_data_key;
112 /* The "aclass" indices for various kinds of computed DWARF symbols. */
114 static int dwarf2_locexpr_index;
115 static int dwarf2_loclist_index;
116 static int dwarf2_locexpr_block_index;
117 static int dwarf2_loclist_block_index;
119 /* A descriptor for dwarf sections.
121 S.ASECTION, SIZE are typically initialized when the objfile is first
122 scanned. BUFFER, READIN are filled in later when the section is read.
123 If the section contained compressed data then SIZE is updated to record
124 the uncompressed size of the section.
126 DWP file format V2 introduces a wrinkle that is easiest to handle by
127 creating the concept of virtual sections contained within a real section.
128 In DWP V2 the sections of the input DWO files are concatenated together
129 into one section, but section offsets are kept relative to the original
131 If this is a virtual dwp-v2 section, S.CONTAINING_SECTION is a backlink to
132 the real section this "virtual" section is contained in, and BUFFER,SIZE
133 describe the virtual section. */
135 struct dwarf2_section_info
139 /* If this is a real section, the bfd section. */
141 /* If this is a virtual section, pointer to the containing ("real")
143 struct dwarf2_section_info *containing_section;
145 /* Pointer to section data, only valid if readin. */
146 const gdb_byte *buffer;
147 /* The size of the section, real or virtual. */
149 /* If this is a virtual section, the offset in the real section.
150 Only valid if is_virtual. */
151 bfd_size_type virtual_offset;
152 /* True if we have tried to read this section. */
154 /* True if this is a virtual section, False otherwise.
155 This specifies which of s.section and s.containing_section to use. */
159 typedef struct dwarf2_section_info dwarf2_section_info_def;
160 DEF_VEC_O (dwarf2_section_info_def);
162 /* All offsets in the index are of this type. It must be
163 architecture-independent. */
164 typedef uint32_t offset_type;
166 DEF_VEC_I (offset_type);
168 /* Ensure only legit values are used. */
169 #define DW2_GDB_INDEX_SYMBOL_STATIC_SET_VALUE(cu_index, value) \
171 gdb_assert ((unsigned int) (value) <= 1); \
172 GDB_INDEX_SYMBOL_STATIC_SET_VALUE((cu_index), (value)); \
175 /* Ensure only legit values are used. */
176 #define DW2_GDB_INDEX_SYMBOL_KIND_SET_VALUE(cu_index, value) \
178 gdb_assert ((value) >= GDB_INDEX_SYMBOL_KIND_TYPE \
179 && (value) <= GDB_INDEX_SYMBOL_KIND_OTHER); \
180 GDB_INDEX_SYMBOL_KIND_SET_VALUE((cu_index), (value)); \
183 /* Ensure we don't use more than the alloted nuber of bits for the CU. */
184 #define DW2_GDB_INDEX_CU_SET_VALUE(cu_index, value) \
186 gdb_assert (((value) & ~GDB_INDEX_CU_MASK) == 0); \
187 GDB_INDEX_CU_SET_VALUE((cu_index), (value)); \
192 /* Convert VALUE between big- and little-endian. */
195 byte_swap (offset_type value)
199 result = (value & 0xff) << 24;
200 result |= (value & 0xff00) << 8;
201 result |= (value & 0xff0000) >> 8;
202 result |= (value & 0xff000000) >> 24;
206 #define MAYBE_SWAP(V) byte_swap (V)
209 #define MAYBE_SWAP(V) static_cast<offset_type> (V)
210 #endif /* WORDS_BIGENDIAN */
212 /* An index into a (C++) symbol name component in a symbol name as
213 recorded in the mapped_index's symbol table. For each C++ symbol
214 in the symbol table, we record one entry for the start of each
215 component in the symbol in a table of name components, and then
216 sort the table, in order to be able to binary search symbol names,
217 ignoring leading namespaces, both completion and regular look up.
218 For example, for symbol "A::B::C", we'll have an entry that points
219 to "A::B::C", another that points to "B::C", and another for "C".
220 Note that function symbols in GDB index have no parameter
221 information, just the function/method names. You can convert a
222 name_component to a "const char *" using the
223 'mapped_index::symbol_name_at(offset_type)' method. */
225 struct name_component
227 /* Offset in the symbol name where the component starts. Stored as
228 a (32-bit) offset instead of a pointer to save memory and improve
229 locality on 64-bit architectures. */
230 offset_type name_offset;
232 /* The symbol's index in the symbol and constant pool tables of a
237 /* Base class containing bits shared by both .gdb_index and
238 .debug_name indexes. */
240 struct mapped_index_base
242 /* The name_component table (a sorted vector). See name_component's
243 description above. */
244 std::vector<name_component> name_components;
246 /* How NAME_COMPONENTS is sorted. */
247 enum case_sensitivity name_components_casing;
249 /* Return the number of names in the symbol table. */
250 virtual size_t symbol_name_count () const = 0;
252 /* Get the name of the symbol at IDX in the symbol table. */
253 virtual const char *symbol_name_at (offset_type idx) const = 0;
255 /* Return whether the name at IDX in the symbol table should be
257 virtual bool symbol_name_slot_invalid (offset_type idx) const
262 /* Build the symbol name component sorted vector, if we haven't
264 void build_name_components ();
266 /* Returns the lower (inclusive) and upper (exclusive) bounds of the
267 possible matches for LN_NO_PARAMS in the name component
269 std::pair<std::vector<name_component>::const_iterator,
270 std::vector<name_component>::const_iterator>
271 find_name_components_bounds (const lookup_name_info &ln_no_params) const;
273 /* Prevent deleting/destroying via a base class pointer. */
275 ~mapped_index_base() = default;
278 /* A description of the mapped index. The file format is described in
279 a comment by the code that writes the index. */
280 struct mapped_index : public mapped_index_base
282 /* A slot/bucket in the symbol table hash. */
283 struct symbol_table_slot
285 const offset_type name;
286 const offset_type vec;
289 /* Index data format version. */
292 /* The total length of the buffer. */
295 /* The address table data. */
296 gdb::array_view<const gdb_byte> address_table;
298 /* The symbol table, implemented as a hash table. */
299 gdb::array_view<symbol_table_slot> symbol_table;
301 /* A pointer to the constant pool. */
302 const char *constant_pool;
304 bool symbol_name_slot_invalid (offset_type idx) const override
306 const auto &bucket = this->symbol_table[idx];
307 return bucket.name == 0 && bucket.vec;
310 /* Convenience method to get at the name of the symbol at IDX in the
312 const char *symbol_name_at (offset_type idx) const override
313 { return this->constant_pool + MAYBE_SWAP (this->symbol_table[idx].name); }
315 size_t symbol_name_count () const override
316 { return this->symbol_table.size (); }
319 /* A description of the mapped .debug_names.
320 Uninitialized map has CU_COUNT 0. */
321 struct mapped_debug_names : public mapped_index_base
323 bfd_endian dwarf5_byte_order;
324 bool dwarf5_is_dwarf64;
325 bool augmentation_is_gdb;
327 uint32_t cu_count = 0;
328 uint32_t tu_count, bucket_count, name_count;
329 const gdb_byte *cu_table_reordered, *tu_table_reordered;
330 const uint32_t *bucket_table_reordered, *hash_table_reordered;
331 const gdb_byte *name_table_string_offs_reordered;
332 const gdb_byte *name_table_entry_offs_reordered;
333 const gdb_byte *entry_pool;
340 /* Attribute name DW_IDX_*. */
343 /* Attribute form DW_FORM_*. */
346 /* Value if FORM is DW_FORM_implicit_const. */
347 LONGEST implicit_const;
349 std::vector<attr> attr_vec;
352 std::unordered_map<ULONGEST, index_val> abbrev_map;
354 const char *namei_to_name (uint32_t namei) const;
356 /* Implementation of the mapped_index_base virtual interface, for
357 the name_components cache. */
359 const char *symbol_name_at (offset_type idx) const override
360 { return namei_to_name (idx); }
362 size_t symbol_name_count () const override
363 { return this->name_count; }
366 typedef struct dwarf2_per_cu_data *dwarf2_per_cu_ptr;
367 DEF_VEC_P (dwarf2_per_cu_ptr);
371 int nr_uniq_abbrev_tables;
373 int nr_symtab_sharers;
374 int nr_stmt_less_type_units;
375 int nr_all_type_units_reallocs;
378 /* Collection of data recorded per objfile.
379 This hangs off of dwarf2_objfile_data_key. */
381 struct dwarf2_per_objfile
383 /* Construct a dwarf2_per_objfile for OBJFILE. NAMES points to the
384 dwarf2 section names, or is NULL if the standard ELF names are
386 dwarf2_per_objfile (struct objfile *objfile,
387 const dwarf2_debug_sections *names);
389 ~dwarf2_per_objfile ();
391 DISABLE_COPY_AND_ASSIGN (dwarf2_per_objfile);
393 /* Free all cached compilation units. */
394 void free_cached_comp_units ();
396 /* This function is mapped across the sections and remembers the
397 offset and size of each of the debugging sections we are
399 void locate_sections (bfd *abfd, asection *sectp,
400 const dwarf2_debug_sections &names);
403 dwarf2_section_info info {};
404 dwarf2_section_info abbrev {};
405 dwarf2_section_info line {};
406 dwarf2_section_info loc {};
407 dwarf2_section_info loclists {};
408 dwarf2_section_info macinfo {};
409 dwarf2_section_info macro {};
410 dwarf2_section_info str {};
411 dwarf2_section_info line_str {};
412 dwarf2_section_info ranges {};
413 dwarf2_section_info rnglists {};
414 dwarf2_section_info addr {};
415 dwarf2_section_info frame {};
416 dwarf2_section_info eh_frame {};
417 dwarf2_section_info gdb_index {};
418 dwarf2_section_info debug_names {};
419 dwarf2_section_info debug_aranges {};
421 VEC (dwarf2_section_info_def) *types = NULL;
424 struct objfile *objfile = NULL;
426 /* Table of all the compilation units. This is used to locate
427 the target compilation unit of a particular reference. */
428 struct dwarf2_per_cu_data **all_comp_units = NULL;
430 /* The number of compilation units in ALL_COMP_UNITS. */
431 int n_comp_units = 0;
433 /* The number of .debug_types-related CUs. */
434 int n_type_units = 0;
436 /* The number of elements allocated in all_type_units.
437 If there are skeleton-less TUs, we add them to all_type_units lazily. */
438 int n_allocated_type_units = 0;
440 /* The .debug_types-related CUs (TUs).
441 This is stored in malloc space because we may realloc it. */
442 struct signatured_type **all_type_units = NULL;
444 /* Table of struct type_unit_group objects.
445 The hash key is the DW_AT_stmt_list value. */
446 htab_t type_unit_groups {};
448 /* A table mapping .debug_types signatures to its signatured_type entry.
449 This is NULL if the .debug_types section hasn't been read in yet. */
450 htab_t signatured_types {};
452 /* Type unit statistics, to see how well the scaling improvements
454 struct tu_stats tu_stats {};
456 /* A chain of compilation units that are currently read in, so that
457 they can be freed later. */
458 dwarf2_per_cu_data *read_in_chain = NULL;
460 /* A table mapping DW_AT_dwo_name values to struct dwo_file objects.
461 This is NULL if the table hasn't been allocated yet. */
464 /* True if we've checked for whether there is a DWP file. */
465 bool dwp_checked = false;
467 /* The DWP file if there is one, or NULL. */
468 struct dwp_file *dwp_file = NULL;
470 /* The shared '.dwz' file, if one exists. This is used when the
471 original data was compressed using 'dwz -m'. */
472 struct dwz_file *dwz_file = NULL;
474 /* A flag indicating whether this objfile has a section loaded at a
476 bool has_section_at_zero = false;
478 /* True if we are using the mapped index,
479 or we are faking it for OBJF_READNOW's sake. */
480 bool using_index = false;
482 /* The mapped index, or NULL if .gdb_index is missing or not being used. */
483 mapped_index *index_table = NULL;
485 /* The mapped index, or NULL if .debug_names is missing or not being used. */
486 std::unique_ptr<mapped_debug_names> debug_names_table;
488 /* When using index_table, this keeps track of all quick_file_names entries.
489 TUs typically share line table entries with a CU, so we maintain a
490 separate table of all line table entries to support the sharing.
491 Note that while there can be way more TUs than CUs, we've already
492 sorted all the TUs into "type unit groups", grouped by their
493 DW_AT_stmt_list value. Therefore the only sharing done here is with a
494 CU and its associated TU group if there is one. */
495 htab_t quick_file_names_table {};
497 /* Set during partial symbol reading, to prevent queueing of full
499 bool reading_partial_symbols = false;
501 /* Table mapping type DIEs to their struct type *.
502 This is NULL if not allocated yet.
503 The mapping is done via (CU/TU + DIE offset) -> type. */
504 htab_t die_type_hash {};
506 /* The CUs we recently read. */
507 VEC (dwarf2_per_cu_ptr) *just_read_cus = NULL;
509 /* Table containing line_header indexed by offset and offset_in_dwz. */
510 htab_t line_header_hash {};
512 /* Table containing all filenames. This is an optional because the
513 table is lazily constructed on first access. */
514 gdb::optional<filename_seen_cache> filenames_cache;
517 static struct dwarf2_per_objfile *dwarf2_per_objfile;
519 /* Default names of the debugging sections. */
521 /* Note that if the debugging section has been compressed, it might
522 have a name like .zdebug_info. */
524 static const struct dwarf2_debug_sections dwarf2_elf_names =
526 { ".debug_info", ".zdebug_info" },
527 { ".debug_abbrev", ".zdebug_abbrev" },
528 { ".debug_line", ".zdebug_line" },
529 { ".debug_loc", ".zdebug_loc" },
530 { ".debug_loclists", ".zdebug_loclists" },
531 { ".debug_macinfo", ".zdebug_macinfo" },
532 { ".debug_macro", ".zdebug_macro" },
533 { ".debug_str", ".zdebug_str" },
534 { ".debug_line_str", ".zdebug_line_str" },
535 { ".debug_ranges", ".zdebug_ranges" },
536 { ".debug_rnglists", ".zdebug_rnglists" },
537 { ".debug_types", ".zdebug_types" },
538 { ".debug_addr", ".zdebug_addr" },
539 { ".debug_frame", ".zdebug_frame" },
540 { ".eh_frame", NULL },
541 { ".gdb_index", ".zgdb_index" },
542 { ".debug_names", ".zdebug_names" },
543 { ".debug_aranges", ".zdebug_aranges" },
547 /* List of DWO/DWP sections. */
549 static const struct dwop_section_names
551 struct dwarf2_section_names abbrev_dwo;
552 struct dwarf2_section_names info_dwo;
553 struct dwarf2_section_names line_dwo;
554 struct dwarf2_section_names loc_dwo;
555 struct dwarf2_section_names loclists_dwo;
556 struct dwarf2_section_names macinfo_dwo;
557 struct dwarf2_section_names macro_dwo;
558 struct dwarf2_section_names str_dwo;
559 struct dwarf2_section_names str_offsets_dwo;
560 struct dwarf2_section_names types_dwo;
561 struct dwarf2_section_names cu_index;
562 struct dwarf2_section_names tu_index;
566 { ".debug_abbrev.dwo", ".zdebug_abbrev.dwo" },
567 { ".debug_info.dwo", ".zdebug_info.dwo" },
568 { ".debug_line.dwo", ".zdebug_line.dwo" },
569 { ".debug_loc.dwo", ".zdebug_loc.dwo" },
570 { ".debug_loclists.dwo", ".zdebug_loclists.dwo" },
571 { ".debug_macinfo.dwo", ".zdebug_macinfo.dwo" },
572 { ".debug_macro.dwo", ".zdebug_macro.dwo" },
573 { ".debug_str.dwo", ".zdebug_str.dwo" },
574 { ".debug_str_offsets.dwo", ".zdebug_str_offsets.dwo" },
575 { ".debug_types.dwo", ".zdebug_types.dwo" },
576 { ".debug_cu_index", ".zdebug_cu_index" },
577 { ".debug_tu_index", ".zdebug_tu_index" },
580 /* local data types */
582 /* The data in a compilation unit header, after target2host
583 translation, looks like this. */
584 struct comp_unit_head
588 unsigned char addr_size;
589 unsigned char signed_addr_p;
590 sect_offset abbrev_sect_off;
592 /* Size of file offsets; either 4 or 8. */
593 unsigned int offset_size;
595 /* Size of the length field; either 4 or 12. */
596 unsigned int initial_length_size;
598 enum dwarf_unit_type unit_type;
600 /* Offset to the first byte of this compilation unit header in the
601 .debug_info section, for resolving relative reference dies. */
602 sect_offset sect_off;
604 /* Offset to first die in this cu from the start of the cu.
605 This will be the first byte following the compilation unit header. */
606 cu_offset first_die_cu_offset;
608 /* 64-bit signature of this type unit - it is valid only for
609 UNIT_TYPE DW_UT_type. */
612 /* For types, offset in the type's DIE of the type defined by this TU. */
613 cu_offset type_cu_offset_in_tu;
616 /* Type used for delaying computation of method physnames.
617 See comments for compute_delayed_physnames. */
618 struct delayed_method_info
620 /* The type to which the method is attached, i.e., its parent class. */
623 /* The index of the method in the type's function fieldlists. */
626 /* The index of the method in the fieldlist. */
629 /* The name of the DIE. */
632 /* The DIE associated with this method. */
633 struct die_info *die;
636 typedef struct delayed_method_info delayed_method_info;
637 DEF_VEC_O (delayed_method_info);
639 /* Internal state when decoding a particular compilation unit. */
642 /* The objfile containing this compilation unit. */
643 struct objfile *objfile;
645 /* The header of the compilation unit. */
646 struct comp_unit_head header;
648 /* Base address of this compilation unit. */
649 CORE_ADDR base_address;
651 /* Non-zero if base_address has been set. */
654 /* The language we are debugging. */
655 enum language language;
656 const struct language_defn *language_defn;
658 const char *producer;
660 /* The generic symbol table building routines have separate lists for
661 file scope symbols and all all other scopes (local scopes). So
662 we need to select the right one to pass to add_symbol_to_list().
663 We do it by keeping a pointer to the correct list in list_in_scope.
665 FIXME: The original dwarf code just treated the file scope as the
666 first local scope, and all other local scopes as nested local
667 scopes, and worked fine. Check to see if we really need to
668 distinguish these in buildsym.c. */
669 struct pending **list_in_scope;
671 /* The abbrev table for this CU.
672 Normally this points to the abbrev table in the objfile.
673 But if DWO_UNIT is non-NULL this is the abbrev table in the DWO file. */
674 struct abbrev_table *abbrev_table;
676 /* Hash table holding all the loaded partial DIEs
677 with partial_die->offset.SECT_OFF as hash. */
680 /* Storage for things with the same lifetime as this read-in compilation
681 unit, including partial DIEs. */
682 struct obstack comp_unit_obstack;
684 /* When multiple dwarf2_cu structures are living in memory, this field
685 chains them all together, so that they can be released efficiently.
686 We will probably also want a generation counter so that most-recently-used
687 compilation units are cached... */
688 struct dwarf2_per_cu_data *read_in_chain;
690 /* Backlink to our per_cu entry. */
691 struct dwarf2_per_cu_data *per_cu;
693 /* How many compilation units ago was this CU last referenced? */
696 /* A hash table of DIE cu_offset for following references with
697 die_info->offset.sect_off as hash. */
700 /* Full DIEs if read in. */
701 struct die_info *dies;
703 /* A set of pointers to dwarf2_per_cu_data objects for compilation
704 units referenced by this one. Only set during full symbol processing;
705 partial symbol tables do not have dependencies. */
708 /* Header data from the line table, during full symbol processing. */
709 struct line_header *line_header;
710 /* Non-NULL if LINE_HEADER is owned by this DWARF_CU. Otherwise,
711 it's owned by dwarf2_per_objfile::line_header_hash. If non-NULL,
712 this is the DW_TAG_compile_unit die for this CU. We'll hold on
713 to the line header as long as this DIE is being processed. See
714 process_die_scope. */
715 die_info *line_header_die_owner;
717 /* A list of methods which need to have physnames computed
718 after all type information has been read. */
719 VEC (delayed_method_info) *method_list;
721 /* To be copied to symtab->call_site_htab. */
722 htab_t call_site_htab;
724 /* Non-NULL if this CU came from a DWO file.
725 There is an invariant here that is important to remember:
726 Except for attributes copied from the top level DIE in the "main"
727 (or "stub") file in preparation for reading the DWO file
728 (e.g., DW_AT_GNU_addr_base), we KISS: there is only *one* CU.
729 Either there isn't a DWO file (in which case this is NULL and the point
730 is moot), or there is and either we're not going to read it (in which
731 case this is NULL) or there is and we are reading it (in which case this
733 struct dwo_unit *dwo_unit;
735 /* The DW_AT_addr_base attribute if present, zero otherwise
736 (zero is a valid value though).
737 Note this value comes from the Fission stub CU/TU's DIE. */
740 /* The DW_AT_ranges_base attribute if present, zero otherwise
741 (zero is a valid value though).
742 Note this value comes from the Fission stub CU/TU's DIE.
743 Also note that the value is zero in the non-DWO case so this value can
744 be used without needing to know whether DWO files are in use or not.
745 N.B. This does not apply to DW_AT_ranges appearing in
746 DW_TAG_compile_unit dies. This is a bit of a wart, consider if ever
747 DW_AT_ranges appeared in the DW_TAG_compile_unit of DWO DIEs: then
748 DW_AT_ranges_base *would* have to be applied, and we'd have to care
749 whether the DW_AT_ranges attribute came from the skeleton or DWO. */
750 ULONGEST ranges_base;
752 /* Mark used when releasing cached dies. */
753 unsigned int mark : 1;
755 /* This CU references .debug_loc. See the symtab->locations_valid field.
756 This test is imperfect as there may exist optimized debug code not using
757 any location list and still facing inlining issues if handled as
758 unoptimized code. For a future better test see GCC PR other/32998. */
759 unsigned int has_loclist : 1;
761 /* These cache the results for producer_is_* fields. CHECKED_PRODUCER is set
762 if all the producer_is_* fields are valid. This information is cached
763 because profiling CU expansion showed excessive time spent in
764 producer_is_gxx_lt_4_6. */
765 unsigned int checked_producer : 1;
766 unsigned int producer_is_gxx_lt_4_6 : 1;
767 unsigned int producer_is_gcc_lt_4_3 : 1;
768 unsigned int producer_is_icc_lt_14 : 1;
770 /* When set, the file that we're processing is known to have
771 debugging info for C++ namespaces. GCC 3.3.x did not produce
772 this information, but later versions do. */
774 unsigned int processing_has_namespace_info : 1;
777 /* Persistent data held for a compilation unit, even when not
778 processing it. We put a pointer to this structure in the
779 read_symtab_private field of the psymtab. */
781 struct dwarf2_per_cu_data
783 /* The start offset and length of this compilation unit.
784 NOTE: Unlike comp_unit_head.length, this length includes
786 If the DIE refers to a DWO file, this is always of the original die,
788 sect_offset sect_off;
791 /* DWARF standard version this data has been read from (such as 4 or 5). */
794 /* Flag indicating this compilation unit will be read in before
795 any of the current compilation units are processed. */
796 unsigned int queued : 1;
798 /* This flag will be set when reading partial DIEs if we need to load
799 absolutely all DIEs for this compilation unit, instead of just the ones
800 we think are interesting. It gets set if we look for a DIE in the
801 hash table and don't find it. */
802 unsigned int load_all_dies : 1;
804 /* Non-zero if this CU is from .debug_types.
805 Struct dwarf2_per_cu_data is contained in struct signatured_type iff
807 unsigned int is_debug_types : 1;
809 /* Non-zero if this CU is from the .dwz file. */
810 unsigned int is_dwz : 1;
812 /* Non-zero if reading a TU directly from a DWO file, bypassing the stub.
813 This flag is only valid if is_debug_types is true.
814 We can't read a CU directly from a DWO file: There are required
815 attributes in the stub. */
816 unsigned int reading_dwo_directly : 1;
818 /* Non-zero if the TU has been read.
819 This is used to assist the "Stay in DWO Optimization" for Fission:
820 When reading a DWO, it's faster to read TUs from the DWO instead of
821 fetching them from random other DWOs (due to comdat folding).
822 If the TU has already been read, the optimization is unnecessary
823 (and unwise - we don't want to change where gdb thinks the TU lives
825 This flag is only valid if is_debug_types is true. */
826 unsigned int tu_read : 1;
828 /* The section this CU/TU lives in.
829 If the DIE refers to a DWO file, this is always the original die,
831 struct dwarf2_section_info *section;
833 /* Set to non-NULL iff this CU is currently loaded. When it gets freed out
834 of the CU cache it gets reset to NULL again. This is left as NULL for
835 dummy CUs (a CU header, but nothing else). */
836 struct dwarf2_cu *cu;
838 /* The corresponding objfile.
839 Normally we can get the objfile from dwarf2_per_objfile.
840 However we can enter this file with just a "per_cu" handle. */
841 struct objfile *objfile;
843 /* When dwarf2_per_objfile->using_index is true, the 'quick' field
844 is active. Otherwise, the 'psymtab' field is active. */
847 /* The partial symbol table associated with this compilation unit,
848 or NULL for unread partial units. */
849 struct partial_symtab *psymtab;
851 /* Data needed by the "quick" functions. */
852 struct dwarf2_per_cu_quick_data *quick;
855 /* The CUs we import using DW_TAG_imported_unit. This is filled in
856 while reading psymtabs, used to compute the psymtab dependencies,
857 and then cleared. Then it is filled in again while reading full
858 symbols, and only deleted when the objfile is destroyed.
860 This is also used to work around a difference between the way gold
861 generates .gdb_index version <=7 and the way gdb does. Arguably this
862 is a gold bug. For symbols coming from TUs, gold records in the index
863 the CU that includes the TU instead of the TU itself. This breaks
864 dw2_lookup_symbol: It assumes that if the index says symbol X lives
865 in CU/TU Y, then one need only expand Y and a subsequent lookup in Y
866 will find X. Alas TUs live in their own symtab, so after expanding CU Y
867 we need to look in TU Z to find X. Fortunately, this is akin to
868 DW_TAG_imported_unit, so we just use the same mechanism: For
869 .gdb_index version <=7 this also records the TUs that the CU referred
870 to. Concurrently with this change gdb was modified to emit version 8
871 indices so we only pay a price for gold generated indices.
872 http://sourceware.org/bugzilla/show_bug.cgi?id=15021. */
873 VEC (dwarf2_per_cu_ptr) *imported_symtabs;
876 /* Entry in the signatured_types hash table. */
878 struct signatured_type
880 /* The "per_cu" object of this type.
881 This struct is used iff per_cu.is_debug_types.
882 N.B.: This is the first member so that it's easy to convert pointers
884 struct dwarf2_per_cu_data per_cu;
886 /* The type's signature. */
889 /* Offset in the TU of the type's DIE, as read from the TU header.
890 If this TU is a DWO stub and the definition lives in a DWO file
891 (specified by DW_AT_GNU_dwo_name), this value is unusable. */
892 cu_offset type_offset_in_tu;
894 /* Offset in the section of the type's DIE.
895 If the definition lives in a DWO file, this is the offset in the
896 .debug_types.dwo section.
897 The value is zero until the actual value is known.
898 Zero is otherwise not a valid section offset. */
899 sect_offset type_offset_in_section;
901 /* Type units are grouped by their DW_AT_stmt_list entry so that they
902 can share them. This points to the containing symtab. */
903 struct type_unit_group *type_unit_group;
906 The first time we encounter this type we fully read it in and install it
907 in the symbol tables. Subsequent times we only need the type. */
910 /* Containing DWO unit.
911 This field is valid iff per_cu.reading_dwo_directly. */
912 struct dwo_unit *dwo_unit;
915 typedef struct signatured_type *sig_type_ptr;
916 DEF_VEC_P (sig_type_ptr);
918 /* A struct that can be used as a hash key for tables based on DW_AT_stmt_list.
919 This includes type_unit_group and quick_file_names. */
921 struct stmt_list_hash
923 /* The DWO unit this table is from or NULL if there is none. */
924 struct dwo_unit *dwo_unit;
926 /* Offset in .debug_line or .debug_line.dwo. */
927 sect_offset line_sect_off;
930 /* Each element of dwarf2_per_objfile->type_unit_groups is a pointer to
931 an object of this type. */
933 struct type_unit_group
935 /* dwarf2read.c's main "handle" on a TU symtab.
936 To simplify things we create an artificial CU that "includes" all the
937 type units using this stmt_list so that the rest of the code still has
938 a "per_cu" handle on the symtab.
939 This PER_CU is recognized by having no section. */
940 #define IS_TYPE_UNIT_GROUP(per_cu) ((per_cu)->section == NULL)
941 struct dwarf2_per_cu_data per_cu;
943 /* The TUs that share this DW_AT_stmt_list entry.
944 This is added to while parsing type units to build partial symtabs,
945 and is deleted afterwards and not used again. */
946 VEC (sig_type_ptr) *tus;
948 /* The compunit symtab.
949 Type units in a group needn't all be defined in the same source file,
950 so we create an essentially anonymous symtab as the compunit symtab. */
951 struct compunit_symtab *compunit_symtab;
953 /* The data used to construct the hash key. */
954 struct stmt_list_hash hash;
956 /* The number of symtabs from the line header.
957 The value here must match line_header.num_file_names. */
958 unsigned int num_symtabs;
960 /* The symbol tables for this TU (obtained from the files listed in
962 WARNING: The order of entries here must match the order of entries
963 in the line header. After the first TU using this type_unit_group, the
964 line header for the subsequent TUs is recreated from this. This is done
965 because we need to use the same symtabs for each TU using the same
966 DW_AT_stmt_list value. Also note that symtabs may be repeated here,
967 there's no guarantee the line header doesn't have duplicate entries. */
968 struct symtab **symtabs;
971 /* These sections are what may appear in a (real or virtual) DWO file. */
975 struct dwarf2_section_info abbrev;
976 struct dwarf2_section_info line;
977 struct dwarf2_section_info loc;
978 struct dwarf2_section_info loclists;
979 struct dwarf2_section_info macinfo;
980 struct dwarf2_section_info macro;
981 struct dwarf2_section_info str;
982 struct dwarf2_section_info str_offsets;
983 /* In the case of a virtual DWO file, these two are unused. */
984 struct dwarf2_section_info info;
985 VEC (dwarf2_section_info_def) *types;
988 /* CUs/TUs in DWP/DWO files. */
992 /* Backlink to the containing struct dwo_file. */
993 struct dwo_file *dwo_file;
995 /* The "id" that distinguishes this CU/TU.
996 .debug_info calls this "dwo_id", .debug_types calls this "signature".
997 Since signatures came first, we stick with it for consistency. */
1000 /* The section this CU/TU lives in, in the DWO file. */
1001 struct dwarf2_section_info *section;
1003 /* Same as dwarf2_per_cu_data:{sect_off,length} but in the DWO section. */
1004 sect_offset sect_off;
1005 unsigned int length;
1007 /* For types, offset in the type's DIE of the type defined by this TU. */
1008 cu_offset type_offset_in_tu;
1011 /* include/dwarf2.h defines the DWP section codes.
1012 It defines a max value but it doesn't define a min value, which we
1013 use for error checking, so provide one. */
1015 enum dwp_v2_section_ids
1020 /* Data for one DWO file.
1022 This includes virtual DWO files (a virtual DWO file is a DWO file as it
1023 appears in a DWP file). DWP files don't really have DWO files per se -
1024 comdat folding of types "loses" the DWO file they came from, and from
1025 a high level view DWP files appear to contain a mass of random types.
1026 However, to maintain consistency with the non-DWP case we pretend DWP
1027 files contain virtual DWO files, and we assign each TU with one virtual
1028 DWO file (generally based on the line and abbrev section offsets -
1029 a heuristic that seems to work in practice). */
1033 /* The DW_AT_GNU_dwo_name attribute.
1034 For virtual DWO files the name is constructed from the section offsets
1035 of abbrev,line,loc,str_offsets so that we combine virtual DWO files
1036 from related CU+TUs. */
1037 const char *dwo_name;
1039 /* The DW_AT_comp_dir attribute. */
1040 const char *comp_dir;
1042 /* The bfd, when the file is open. Otherwise this is NULL.
1043 This is unused(NULL) for virtual DWO files where we use dwp_file.dbfd. */
1046 /* The sections that make up this DWO file.
1047 Remember that for virtual DWO files in DWP V2, these are virtual
1048 sections (for lack of a better name). */
1049 struct dwo_sections sections;
1051 /* The CUs in the file.
1052 Each element is a struct dwo_unit. Multiple CUs per DWO are supported as
1053 an extension to handle LLVM's Link Time Optimization output (where
1054 multiple source files may be compiled into a single object/dwo pair). */
1057 /* Table of TUs in the file.
1058 Each element is a struct dwo_unit. */
1062 /* These sections are what may appear in a DWP file. */
1066 /* These are used by both DWP version 1 and 2. */
1067 struct dwarf2_section_info str;
1068 struct dwarf2_section_info cu_index;
1069 struct dwarf2_section_info tu_index;
1071 /* These are only used by DWP version 2 files.
1072 In DWP version 1 the .debug_info.dwo, .debug_types.dwo, and other
1073 sections are referenced by section number, and are not recorded here.
1074 In DWP version 2 there is at most one copy of all these sections, each
1075 section being (effectively) comprised of the concatenation of all of the
1076 individual sections that exist in the version 1 format.
1077 To keep the code simple we treat each of these concatenated pieces as a
1078 section itself (a virtual section?). */
1079 struct dwarf2_section_info abbrev;
1080 struct dwarf2_section_info info;
1081 struct dwarf2_section_info line;
1082 struct dwarf2_section_info loc;
1083 struct dwarf2_section_info macinfo;
1084 struct dwarf2_section_info macro;
1085 struct dwarf2_section_info str_offsets;
1086 struct dwarf2_section_info types;
1089 /* These sections are what may appear in a virtual DWO file in DWP version 1.
1090 A virtual DWO file is a DWO file as it appears in a DWP file. */
1092 struct virtual_v1_dwo_sections
1094 struct dwarf2_section_info abbrev;
1095 struct dwarf2_section_info line;
1096 struct dwarf2_section_info loc;
1097 struct dwarf2_section_info macinfo;
1098 struct dwarf2_section_info macro;
1099 struct dwarf2_section_info str_offsets;
1100 /* Each DWP hash table entry records one CU or one TU.
1101 That is recorded here, and copied to dwo_unit.section. */
1102 struct dwarf2_section_info info_or_types;
1105 /* Similar to virtual_v1_dwo_sections, but for DWP version 2.
1106 In version 2, the sections of the DWO files are concatenated together
1107 and stored in one section of that name. Thus each ELF section contains
1108 several "virtual" sections. */
1110 struct virtual_v2_dwo_sections
1112 bfd_size_type abbrev_offset;
1113 bfd_size_type abbrev_size;
1115 bfd_size_type line_offset;
1116 bfd_size_type line_size;
1118 bfd_size_type loc_offset;
1119 bfd_size_type loc_size;
1121 bfd_size_type macinfo_offset;
1122 bfd_size_type macinfo_size;
1124 bfd_size_type macro_offset;
1125 bfd_size_type macro_size;
1127 bfd_size_type str_offsets_offset;
1128 bfd_size_type str_offsets_size;
1130 /* Each DWP hash table entry records one CU or one TU.
1131 That is recorded here, and copied to dwo_unit.section. */
1132 bfd_size_type info_or_types_offset;
1133 bfd_size_type info_or_types_size;
1136 /* Contents of DWP hash tables. */
1138 struct dwp_hash_table
1140 uint32_t version, nr_columns;
1141 uint32_t nr_units, nr_slots;
1142 const gdb_byte *hash_table, *unit_table;
1147 const gdb_byte *indices;
1151 /* This is indexed by column number and gives the id of the section
1153 #define MAX_NR_V2_DWO_SECTIONS \
1154 (1 /* .debug_info or .debug_types */ \
1155 + 1 /* .debug_abbrev */ \
1156 + 1 /* .debug_line */ \
1157 + 1 /* .debug_loc */ \
1158 + 1 /* .debug_str_offsets */ \
1159 + 1 /* .debug_macro or .debug_macinfo */)
1160 int section_ids[MAX_NR_V2_DWO_SECTIONS];
1161 const gdb_byte *offsets;
1162 const gdb_byte *sizes;
1167 /* Data for one DWP file. */
1171 /* Name of the file. */
1174 /* File format version. */
1180 /* Section info for this file. */
1181 struct dwp_sections sections;
1183 /* Table of CUs in the file. */
1184 const struct dwp_hash_table *cus;
1186 /* Table of TUs in the file. */
1187 const struct dwp_hash_table *tus;
1189 /* Tables of loaded CUs/TUs. Each entry is a struct dwo_unit *. */
1193 /* Table to map ELF section numbers to their sections.
1194 This is only needed for the DWP V1 file format. */
1195 unsigned int num_sections;
1196 asection **elf_sections;
1199 /* This represents a '.dwz' file. */
1203 /* A dwz file can only contain a few sections. */
1204 struct dwarf2_section_info abbrev;
1205 struct dwarf2_section_info info;
1206 struct dwarf2_section_info str;
1207 struct dwarf2_section_info line;
1208 struct dwarf2_section_info macro;
1209 struct dwarf2_section_info gdb_index;
1210 struct dwarf2_section_info debug_names;
1212 /* The dwz's BFD. */
1216 /* Struct used to pass misc. parameters to read_die_and_children, et
1217 al. which are used for both .debug_info and .debug_types dies.
1218 All parameters here are unchanging for the life of the call. This
1219 struct exists to abstract away the constant parameters of die reading. */
1221 struct die_reader_specs
1223 /* The bfd of die_section. */
1226 /* The CU of the DIE we are parsing. */
1227 struct dwarf2_cu *cu;
1229 /* Non-NULL if reading a DWO file (including one packaged into a DWP). */
1230 struct dwo_file *dwo_file;
1232 /* The section the die comes from.
1233 This is either .debug_info or .debug_types, or the .dwo variants. */
1234 struct dwarf2_section_info *die_section;
1236 /* die_section->buffer. */
1237 const gdb_byte *buffer;
1239 /* The end of the buffer. */
1240 const gdb_byte *buffer_end;
1242 /* The value of the DW_AT_comp_dir attribute. */
1243 const char *comp_dir;
1246 /* Type of function passed to init_cutu_and_read_dies, et.al. */
1247 typedef void (die_reader_func_ftype) (const struct die_reader_specs *reader,
1248 const gdb_byte *info_ptr,
1249 struct die_info *comp_unit_die,
1253 /* A 1-based directory index. This is a strong typedef to prevent
1254 accidentally using a directory index as a 0-based index into an
1256 enum class dir_index : unsigned int {};
1258 /* Likewise, a 1-based file name index. */
1259 enum class file_name_index : unsigned int {};
1263 file_entry () = default;
1265 file_entry (const char *name_, dir_index d_index_,
1266 unsigned int mod_time_, unsigned int length_)
1269 mod_time (mod_time_),
1273 /* Return the include directory at D_INDEX stored in LH. Returns
1274 NULL if D_INDEX is out of bounds. */
1275 const char *include_dir (const line_header *lh) const;
1277 /* The file name. Note this is an observing pointer. The memory is
1278 owned by debug_line_buffer. */
1279 const char *name {};
1281 /* The directory index (1-based). */
1282 dir_index d_index {};
1284 unsigned int mod_time {};
1286 unsigned int length {};
1288 /* True if referenced by the Line Number Program. */
1291 /* The associated symbol table, if any. */
1292 struct symtab *symtab {};
1295 /* The line number information for a compilation unit (found in the
1296 .debug_line section) begins with a "statement program header",
1297 which contains the following information. */
1304 /* Add an entry to the include directory table. */
1305 void add_include_dir (const char *include_dir);
1307 /* Add an entry to the file name table. */
1308 void add_file_name (const char *name, dir_index d_index,
1309 unsigned int mod_time, unsigned int length);
1311 /* Return the include dir at INDEX (1-based). Returns NULL if INDEX
1312 is out of bounds. */
1313 const char *include_dir_at (dir_index index) const
1315 /* Convert directory index number (1-based) to vector index
1317 size_t vec_index = to_underlying (index) - 1;
1319 if (vec_index >= include_dirs.size ())
1321 return include_dirs[vec_index];
1324 /* Return the file name at INDEX (1-based). Returns NULL if INDEX
1325 is out of bounds. */
1326 file_entry *file_name_at (file_name_index index)
1328 /* Convert file name index number (1-based) to vector index
1330 size_t vec_index = to_underlying (index) - 1;
1332 if (vec_index >= file_names.size ())
1334 return &file_names[vec_index];
1337 /* Const version of the above. */
1338 const file_entry *file_name_at (unsigned int index) const
1340 if (index >= file_names.size ())
1342 return &file_names[index];
1345 /* Offset of line number information in .debug_line section. */
1346 sect_offset sect_off {};
1348 /* OFFSET is for struct dwz_file associated with dwarf2_per_objfile. */
1349 unsigned offset_in_dwz : 1; /* Can't initialize bitfields in-class. */
1351 unsigned int total_length {};
1352 unsigned short version {};
1353 unsigned int header_length {};
1354 unsigned char minimum_instruction_length {};
1355 unsigned char maximum_ops_per_instruction {};
1356 unsigned char default_is_stmt {};
1358 unsigned char line_range {};
1359 unsigned char opcode_base {};
1361 /* standard_opcode_lengths[i] is the number of operands for the
1362 standard opcode whose value is i. This means that
1363 standard_opcode_lengths[0] is unused, and the last meaningful
1364 element is standard_opcode_lengths[opcode_base - 1]. */
1365 std::unique_ptr<unsigned char[]> standard_opcode_lengths;
1367 /* The include_directories table. Note these are observing
1368 pointers. The memory is owned by debug_line_buffer. */
1369 std::vector<const char *> include_dirs;
1371 /* The file_names table. */
1372 std::vector<file_entry> file_names;
1374 /* The start and end of the statement program following this
1375 header. These point into dwarf2_per_objfile->line_buffer. */
1376 const gdb_byte *statement_program_start {}, *statement_program_end {};
1379 typedef std::unique_ptr<line_header> line_header_up;
1382 file_entry::include_dir (const line_header *lh) const
1384 return lh->include_dir_at (d_index);
1387 /* When we construct a partial symbol table entry we only
1388 need this much information. */
1389 struct partial_die_info
1391 /* Offset of this DIE. */
1392 sect_offset sect_off;
1394 /* DWARF-2 tag for this DIE. */
1395 ENUM_BITFIELD(dwarf_tag) tag : 16;
1397 /* Assorted flags describing the data found in this DIE. */
1398 unsigned int has_children : 1;
1399 unsigned int is_external : 1;
1400 unsigned int is_declaration : 1;
1401 unsigned int has_type : 1;
1402 unsigned int has_specification : 1;
1403 unsigned int has_pc_info : 1;
1404 unsigned int may_be_inlined : 1;
1406 /* This DIE has been marked DW_AT_main_subprogram. */
1407 unsigned int main_subprogram : 1;
1409 /* Flag set if the SCOPE field of this structure has been
1411 unsigned int scope_set : 1;
1413 /* Flag set if the DIE has a byte_size attribute. */
1414 unsigned int has_byte_size : 1;
1416 /* Flag set if the DIE has a DW_AT_const_value attribute. */
1417 unsigned int has_const_value : 1;
1419 /* Flag set if any of the DIE's children are template arguments. */
1420 unsigned int has_template_arguments : 1;
1422 /* Flag set if fixup_partial_die has been called on this die. */
1423 unsigned int fixup_called : 1;
1425 /* Flag set if DW_TAG_imported_unit uses DW_FORM_GNU_ref_alt. */
1426 unsigned int is_dwz : 1;
1428 /* Flag set if spec_offset uses DW_FORM_GNU_ref_alt. */
1429 unsigned int spec_is_dwz : 1;
1431 /* The name of this DIE. Normally the value of DW_AT_name, but
1432 sometimes a default name for unnamed DIEs. */
1435 /* The linkage name, if present. */
1436 const char *linkage_name;
1438 /* The scope to prepend to our children. This is generally
1439 allocated on the comp_unit_obstack, so will disappear
1440 when this compilation unit leaves the cache. */
1443 /* Some data associated with the partial DIE. The tag determines
1444 which field is live. */
1447 /* The location description associated with this DIE, if any. */
1448 struct dwarf_block *locdesc;
1449 /* The offset of an import, for DW_TAG_imported_unit. */
1450 sect_offset sect_off;
1453 /* If HAS_PC_INFO, the PC range associated with this DIE. */
1457 /* Pointer into the info_buffer (or types_buffer) pointing at the target of
1458 DW_AT_sibling, if any. */
1459 /* NOTE: This member isn't strictly necessary, read_partial_die could
1460 return DW_AT_sibling values to its caller load_partial_dies. */
1461 const gdb_byte *sibling;
1463 /* If HAS_SPECIFICATION, the offset of the DIE referred to by
1464 DW_AT_specification (or DW_AT_abstract_origin or
1465 DW_AT_extension). */
1466 sect_offset spec_offset;
1468 /* Pointers to this DIE's parent, first child, and next sibling,
1470 struct partial_die_info *die_parent, *die_child, *die_sibling;
1473 /* This data structure holds the information of an abbrev. */
1476 unsigned int number; /* number identifying abbrev */
1477 enum dwarf_tag tag; /* dwarf tag */
1478 unsigned short has_children; /* boolean */
1479 unsigned short num_attrs; /* number of attributes */
1480 struct attr_abbrev *attrs; /* an array of attribute descriptions */
1481 struct abbrev_info *next; /* next in chain */
1486 ENUM_BITFIELD(dwarf_attribute) name : 16;
1487 ENUM_BITFIELD(dwarf_form) form : 16;
1489 /* It is valid only if FORM is DW_FORM_implicit_const. */
1490 LONGEST implicit_const;
1493 /* Size of abbrev_table.abbrev_hash_table. */
1494 #define ABBREV_HASH_SIZE 121
1496 /* Top level data structure to contain an abbreviation table. */
1500 /* Where the abbrev table came from.
1501 This is used as a sanity check when the table is used. */
1502 sect_offset sect_off;
1504 /* Storage for the abbrev table. */
1505 struct obstack abbrev_obstack;
1507 /* Hash table of abbrevs.
1508 This is an array of size ABBREV_HASH_SIZE allocated in abbrev_obstack.
1509 It could be statically allocated, but the previous code didn't so we
1511 struct abbrev_info **abbrevs;
1514 /* Attributes have a name and a value. */
1517 ENUM_BITFIELD(dwarf_attribute) name : 16;
1518 ENUM_BITFIELD(dwarf_form) form : 15;
1520 /* Has DW_STRING already been updated by dwarf2_canonicalize_name? This
1521 field should be in u.str (existing only for DW_STRING) but it is kept
1522 here for better struct attribute alignment. */
1523 unsigned int string_is_canonical : 1;
1528 struct dwarf_block *blk;
1537 /* This data structure holds a complete die structure. */
1540 /* DWARF-2 tag for this DIE. */
1541 ENUM_BITFIELD(dwarf_tag) tag : 16;
1543 /* Number of attributes */
1544 unsigned char num_attrs;
1546 /* True if we're presently building the full type name for the
1547 type derived from this DIE. */
1548 unsigned char building_fullname : 1;
1550 /* True if this die is in process. PR 16581. */
1551 unsigned char in_process : 1;
1554 unsigned int abbrev;
1556 /* Offset in .debug_info or .debug_types section. */
1557 sect_offset sect_off;
1559 /* The dies in a compilation unit form an n-ary tree. PARENT
1560 points to this die's parent; CHILD points to the first child of
1561 this node; and all the children of a given node are chained
1562 together via their SIBLING fields. */
1563 struct die_info *child; /* Its first child, if any. */
1564 struct die_info *sibling; /* Its next sibling, if any. */
1565 struct die_info *parent; /* Its parent, if any. */
1567 /* An array of attributes, with NUM_ATTRS elements. There may be
1568 zero, but it's not common and zero-sized arrays are not
1569 sufficiently portable C. */
1570 struct attribute attrs[1];
1573 /* Get at parts of an attribute structure. */
1575 #define DW_STRING(attr) ((attr)->u.str)
1576 #define DW_STRING_IS_CANONICAL(attr) ((attr)->string_is_canonical)
1577 #define DW_UNSND(attr) ((attr)->u.unsnd)
1578 #define DW_BLOCK(attr) ((attr)->u.blk)
1579 #define DW_SND(attr) ((attr)->u.snd)
1580 #define DW_ADDR(attr) ((attr)->u.addr)
1581 #define DW_SIGNATURE(attr) ((attr)->u.signature)
1583 /* Blocks are a bunch of untyped bytes. */
1588 /* Valid only if SIZE is not zero. */
1589 const gdb_byte *data;
1592 #ifndef ATTR_ALLOC_CHUNK
1593 #define ATTR_ALLOC_CHUNK 4
1596 /* Allocate fields for structs, unions and enums in this size. */
1597 #ifndef DW_FIELD_ALLOC_CHUNK
1598 #define DW_FIELD_ALLOC_CHUNK 4
1601 /* FIXME: We might want to set this from BFD via bfd_arch_bits_per_byte,
1602 but this would require a corresponding change in unpack_field_as_long
1604 static int bits_per_byte = 8;
1608 struct nextfield *next;
1616 struct nextfnfield *next;
1617 struct fn_field fnfield;
1624 struct nextfnfield *head;
1627 struct decl_field_list
1629 struct decl_field field;
1630 struct decl_field_list *next;
1633 /* The routines that read and process dies for a C struct or C++ class
1634 pass lists of data member fields and lists of member function fields
1635 in an instance of a field_info structure, as defined below. */
1638 /* List of data member and baseclasses fields. */
1639 struct nextfield *fields, *baseclasses;
1641 /* Number of fields (including baseclasses). */
1644 /* Number of baseclasses. */
1647 /* Set if the accesibility of one of the fields is not public. */
1648 int non_public_fields;
1650 /* Member function fieldlist array, contains name of possibly overloaded
1651 member function, number of overloaded member functions and a pointer
1652 to the head of the member function field chain. */
1653 struct fnfieldlist *fnfieldlists;
1655 /* Number of entries in the fnfieldlists array. */
1658 /* typedefs defined inside this class. TYPEDEF_FIELD_LIST contains head of
1659 a NULL terminated list of TYPEDEF_FIELD_LIST_COUNT elements. */
1660 struct decl_field_list *typedef_field_list;
1661 unsigned typedef_field_list_count;
1663 /* Nested types defined by this class and the number of elements in this
1665 struct decl_field_list *nested_types_list;
1666 unsigned nested_types_list_count;
1669 /* One item on the queue of compilation units to read in full symbols
1671 struct dwarf2_queue_item
1673 struct dwarf2_per_cu_data *per_cu;
1674 enum language pretend_language;
1675 struct dwarf2_queue_item *next;
1678 /* The current queue. */
1679 static struct dwarf2_queue_item *dwarf2_queue, *dwarf2_queue_tail;
1681 /* Loaded secondary compilation units are kept in memory until they
1682 have not been referenced for the processing of this many
1683 compilation units. Set this to zero to disable caching. Cache
1684 sizes of up to at least twenty will improve startup time for
1685 typical inter-CU-reference binaries, at an obvious memory cost. */
1686 static int dwarf_max_cache_age = 5;
1688 show_dwarf_max_cache_age (struct ui_file *file, int from_tty,
1689 struct cmd_list_element *c, const char *value)
1691 fprintf_filtered (file, _("The upper bound on the age of cached "
1692 "DWARF compilation units is %s.\n"),
1696 /* local function prototypes */
1698 static const char *get_section_name (const struct dwarf2_section_info *);
1700 static const char *get_section_file_name (const struct dwarf2_section_info *);
1702 static void dwarf2_find_base_address (struct die_info *die,
1703 struct dwarf2_cu *cu);
1705 static struct partial_symtab *create_partial_symtab
1706 (struct dwarf2_per_cu_data *per_cu, const char *name);
1708 static void build_type_psymtabs_reader (const struct die_reader_specs *reader,
1709 const gdb_byte *info_ptr,
1710 struct die_info *type_unit_die,
1711 int has_children, void *data);
1713 static void dwarf2_build_psymtabs_hard (struct objfile *);
1715 static void scan_partial_symbols (struct partial_die_info *,
1716 CORE_ADDR *, CORE_ADDR *,
1717 int, struct dwarf2_cu *);
1719 static void add_partial_symbol (struct partial_die_info *,
1720 struct dwarf2_cu *);
1722 static void add_partial_namespace (struct partial_die_info *pdi,
1723 CORE_ADDR *lowpc, CORE_ADDR *highpc,
1724 int set_addrmap, struct dwarf2_cu *cu);
1726 static void add_partial_module (struct partial_die_info *pdi, CORE_ADDR *lowpc,
1727 CORE_ADDR *highpc, int set_addrmap,
1728 struct dwarf2_cu *cu);
1730 static void add_partial_enumeration (struct partial_die_info *enum_pdi,
1731 struct dwarf2_cu *cu);
1733 static void add_partial_subprogram (struct partial_die_info *pdi,
1734 CORE_ADDR *lowpc, CORE_ADDR *highpc,
1735 int need_pc, struct dwarf2_cu *cu);
1737 static void dwarf2_read_symtab (struct partial_symtab *,
1740 static void psymtab_to_symtab_1 (struct partial_symtab *);
1742 static struct abbrev_info *abbrev_table_lookup_abbrev
1743 (const struct abbrev_table *, unsigned int);
1745 static struct abbrev_table *abbrev_table_read_table
1746 (struct dwarf2_section_info *, sect_offset);
1748 static void abbrev_table_free (struct abbrev_table *);
1750 static void abbrev_table_free_cleanup (void *);
1752 static void dwarf2_read_abbrevs (struct dwarf2_cu *,
1753 struct dwarf2_section_info *);
1755 static void dwarf2_free_abbrev_table (void *);
1757 static unsigned int peek_abbrev_code (bfd *, const gdb_byte *);
1759 static struct partial_die_info *load_partial_dies
1760 (const struct die_reader_specs *, const gdb_byte *, int);
1762 static const gdb_byte *read_partial_die (const struct die_reader_specs *,
1763 struct partial_die_info *,
1764 struct abbrev_info *,
1768 static struct partial_die_info *find_partial_die (sect_offset, int,
1769 struct dwarf2_cu *);
1771 static void fixup_partial_die (struct partial_die_info *,
1772 struct dwarf2_cu *);
1774 static const gdb_byte *read_attribute (const struct die_reader_specs *,
1775 struct attribute *, struct attr_abbrev *,
1778 static unsigned int read_1_byte (bfd *, const gdb_byte *);
1780 static int read_1_signed_byte (bfd *, const gdb_byte *);
1782 static unsigned int read_2_bytes (bfd *, const gdb_byte *);
1784 static unsigned int read_4_bytes (bfd *, const gdb_byte *);
1786 static ULONGEST read_8_bytes (bfd *, const gdb_byte *);
1788 static CORE_ADDR read_address (bfd *, const gdb_byte *ptr, struct dwarf2_cu *,
1791 static LONGEST read_initial_length (bfd *, const gdb_byte *, unsigned int *);
1793 static LONGEST read_checked_initial_length_and_offset
1794 (bfd *, const gdb_byte *, const struct comp_unit_head *,
1795 unsigned int *, unsigned int *);
1797 static LONGEST read_offset (bfd *, const gdb_byte *,
1798 const struct comp_unit_head *,
1801 static LONGEST read_offset_1 (bfd *, const gdb_byte *, unsigned int);
1803 static sect_offset read_abbrev_offset (struct dwarf2_section_info *,
1806 static const gdb_byte *read_n_bytes (bfd *, const gdb_byte *, unsigned int);
1808 static const char *read_direct_string (bfd *, const gdb_byte *, unsigned int *);
1810 static const char *read_indirect_string (bfd *, const gdb_byte *,
1811 const struct comp_unit_head *,
1814 static const char *read_indirect_line_string (bfd *, const gdb_byte *,
1815 const struct comp_unit_head *,
1818 static const char *read_indirect_string_at_offset (bfd *abfd,
1819 LONGEST str_offset);
1821 static const char *read_indirect_string_from_dwz (struct dwz_file *, LONGEST);
1823 static LONGEST read_signed_leb128 (bfd *, const gdb_byte *, unsigned int *);
1825 static CORE_ADDR read_addr_index_from_leb128 (struct dwarf2_cu *,
1829 static const char *read_str_index (const struct die_reader_specs *reader,
1830 ULONGEST str_index);
1832 static void set_cu_language (unsigned int, struct dwarf2_cu *);
1834 static struct attribute *dwarf2_attr (struct die_info *, unsigned int,
1835 struct dwarf2_cu *);
1837 static struct attribute *dwarf2_attr_no_follow (struct die_info *,
1840 static const char *dwarf2_string_attr (struct die_info *die, unsigned int name,
1841 struct dwarf2_cu *cu);
1843 static int dwarf2_flag_true_p (struct die_info *die, unsigned name,
1844 struct dwarf2_cu *cu);
1846 static int die_is_declaration (struct die_info *, struct dwarf2_cu *cu);
1848 static struct die_info *die_specification (struct die_info *die,
1849 struct dwarf2_cu **);
1851 static line_header_up dwarf_decode_line_header (sect_offset sect_off,
1852 struct dwarf2_cu *cu);
1854 static void dwarf_decode_lines (struct line_header *, const char *,
1855 struct dwarf2_cu *, struct partial_symtab *,
1856 CORE_ADDR, int decode_mapping);
1858 static void dwarf2_start_subfile (const char *, const char *);
1860 static struct compunit_symtab *dwarf2_start_symtab (struct dwarf2_cu *,
1861 const char *, const char *,
1864 static struct symbol *new_symbol (struct die_info *, struct type *,
1865 struct dwarf2_cu *);
1867 static struct symbol *new_symbol_full (struct die_info *, struct type *,
1868 struct dwarf2_cu *, struct symbol *);
1870 static void dwarf2_const_value (const struct attribute *, struct symbol *,
1871 struct dwarf2_cu *);
1873 static void dwarf2_const_value_attr (const struct attribute *attr,
1876 struct obstack *obstack,
1877 struct dwarf2_cu *cu, LONGEST *value,
1878 const gdb_byte **bytes,
1879 struct dwarf2_locexpr_baton **baton);
1881 static struct type *die_type (struct die_info *, struct dwarf2_cu *);
1883 static int need_gnat_info (struct dwarf2_cu *);
1885 static struct type *die_descriptive_type (struct die_info *,
1886 struct dwarf2_cu *);
1888 static void set_descriptive_type (struct type *, struct die_info *,
1889 struct dwarf2_cu *);
1891 static struct type *die_containing_type (struct die_info *,
1892 struct dwarf2_cu *);
1894 static struct type *lookup_die_type (struct die_info *, const struct attribute *,
1895 struct dwarf2_cu *);
1897 static struct type *read_type_die (struct die_info *, struct dwarf2_cu *);
1899 static struct type *read_type_die_1 (struct die_info *, struct dwarf2_cu *);
1901 static const char *determine_prefix (struct die_info *die, struct dwarf2_cu *);
1903 static char *typename_concat (struct obstack *obs, const char *prefix,
1904 const char *suffix, int physname,
1905 struct dwarf2_cu *cu);
1907 static void read_file_scope (struct die_info *, struct dwarf2_cu *);
1909 static void read_type_unit_scope (struct die_info *, struct dwarf2_cu *);
1911 static void read_func_scope (struct die_info *, struct dwarf2_cu *);
1913 static void read_lexical_block_scope (struct die_info *, struct dwarf2_cu *);
1915 static void read_call_site_scope (struct die_info *die, struct dwarf2_cu *cu);
1917 static void read_variable (struct die_info *die, struct dwarf2_cu *cu);
1919 static int dwarf2_ranges_read (unsigned, CORE_ADDR *, CORE_ADDR *,
1920 struct dwarf2_cu *, struct partial_symtab *);
1922 /* How dwarf2_get_pc_bounds constructed its *LOWPC and *HIGHPC return
1923 values. Keep the items ordered with increasing constraints compliance. */
1926 /* No attribute DW_AT_low_pc, DW_AT_high_pc or DW_AT_ranges was found. */
1927 PC_BOUNDS_NOT_PRESENT,
1929 /* Some of the attributes DW_AT_low_pc, DW_AT_high_pc or DW_AT_ranges
1930 were present but they do not form a valid range of PC addresses. */
1933 /* Discontiguous range was found - that is DW_AT_ranges was found. */
1936 /* Contiguous range was found - DW_AT_low_pc and DW_AT_high_pc were found. */
1940 static enum pc_bounds_kind dwarf2_get_pc_bounds (struct die_info *,
1941 CORE_ADDR *, CORE_ADDR *,
1943 struct partial_symtab *);
1945 static void get_scope_pc_bounds (struct die_info *,
1946 CORE_ADDR *, CORE_ADDR *,
1947 struct dwarf2_cu *);
1949 static void dwarf2_record_block_ranges (struct die_info *, struct block *,
1950 CORE_ADDR, struct dwarf2_cu *);
1952 static void dwarf2_add_field (struct field_info *, struct die_info *,
1953 struct dwarf2_cu *);
1955 static void dwarf2_attach_fields_to_type (struct field_info *,
1956 struct type *, struct dwarf2_cu *);
1958 static void dwarf2_add_member_fn (struct field_info *,
1959 struct die_info *, struct type *,
1960 struct dwarf2_cu *);
1962 static void dwarf2_attach_fn_fields_to_type (struct field_info *,
1964 struct dwarf2_cu *);
1966 static void process_structure_scope (struct die_info *, struct dwarf2_cu *);
1968 static void read_common_block (struct die_info *, struct dwarf2_cu *);
1970 static void read_namespace (struct die_info *die, struct dwarf2_cu *);
1972 static void read_module (struct die_info *die, struct dwarf2_cu *cu);
1974 static struct using_direct **using_directives (enum language);
1976 static void read_import_statement (struct die_info *die, struct dwarf2_cu *);
1978 static int read_namespace_alias (struct die_info *die, struct dwarf2_cu *cu);
1980 static struct type *read_module_type (struct die_info *die,
1981 struct dwarf2_cu *cu);
1983 static const char *namespace_name (struct die_info *die,
1984 int *is_anonymous, struct dwarf2_cu *);
1986 static void process_enumeration_scope (struct die_info *, struct dwarf2_cu *);
1988 static CORE_ADDR decode_locdesc (struct dwarf_block *, struct dwarf2_cu *);
1990 static enum dwarf_array_dim_ordering read_array_order (struct die_info *,
1991 struct dwarf2_cu *);
1993 static struct die_info *read_die_and_siblings_1
1994 (const struct die_reader_specs *, const gdb_byte *, const gdb_byte **,
1997 static struct die_info *read_die_and_siblings (const struct die_reader_specs *,
1998 const gdb_byte *info_ptr,
1999 const gdb_byte **new_info_ptr,
2000 struct die_info *parent);
2002 static const gdb_byte *read_full_die_1 (const struct die_reader_specs *,
2003 struct die_info **, const gdb_byte *,
2006 static const gdb_byte *read_full_die (const struct die_reader_specs *,
2007 struct die_info **, const gdb_byte *,
2010 static void process_die (struct die_info *, struct dwarf2_cu *);
2012 static const char *dwarf2_canonicalize_name (const char *, struct dwarf2_cu *,
2015 static const char *dwarf2_name (struct die_info *die, struct dwarf2_cu *);
2017 static const char *dwarf2_full_name (const char *name,
2018 struct die_info *die,
2019 struct dwarf2_cu *cu);
2021 static const char *dwarf2_physname (const char *name, struct die_info *die,
2022 struct dwarf2_cu *cu);
2024 static struct die_info *dwarf2_extension (struct die_info *die,
2025 struct dwarf2_cu **);
2027 static const char *dwarf_tag_name (unsigned int);
2029 static const char *dwarf_attr_name (unsigned int);
2031 static const char *dwarf_form_name (unsigned int);
2033 static const char *dwarf_bool_name (unsigned int);
2035 static const char *dwarf_type_encoding_name (unsigned int);
2037 static struct die_info *sibling_die (struct die_info *);
2039 static void dump_die_shallow (struct ui_file *, int indent, struct die_info *);
2041 static void dump_die_for_error (struct die_info *);
2043 static void dump_die_1 (struct ui_file *, int level, int max_level,
2046 /*static*/ void dump_die (struct die_info *, int max_level);
2048 static void store_in_ref_table (struct die_info *,
2049 struct dwarf2_cu *);
2051 static sect_offset dwarf2_get_ref_die_offset (const struct attribute *);
2053 static LONGEST dwarf2_get_attr_constant_value (const struct attribute *, int);
2055 static struct die_info *follow_die_ref_or_sig (struct die_info *,
2056 const struct attribute *,
2057 struct dwarf2_cu **);
2059 static struct die_info *follow_die_ref (struct die_info *,
2060 const struct attribute *,
2061 struct dwarf2_cu **);
2063 static struct die_info *follow_die_sig (struct die_info *,
2064 const struct attribute *,
2065 struct dwarf2_cu **);
2067 static struct type *get_signatured_type (struct die_info *, ULONGEST,
2068 struct dwarf2_cu *);
2070 static struct type *get_DW_AT_signature_type (struct die_info *,
2071 const struct attribute *,
2072 struct dwarf2_cu *);
2074 static void load_full_type_unit (struct dwarf2_per_cu_data *per_cu);
2076 static void read_signatured_type (struct signatured_type *);
2078 static int attr_to_dynamic_prop (const struct attribute *attr,
2079 struct die_info *die, struct dwarf2_cu *cu,
2080 struct dynamic_prop *prop);
2082 /* memory allocation interface */
2084 static struct dwarf_block *dwarf_alloc_block (struct dwarf2_cu *);
2086 static struct die_info *dwarf_alloc_die (struct dwarf2_cu *, int);
2088 static void dwarf_decode_macros (struct dwarf2_cu *, unsigned int, int);
2090 static int attr_form_is_block (const struct attribute *);
2092 static int attr_form_is_section_offset (const struct attribute *);
2094 static int attr_form_is_constant (const struct attribute *);
2096 static int attr_form_is_ref (const struct attribute *);
2098 static void fill_in_loclist_baton (struct dwarf2_cu *cu,
2099 struct dwarf2_loclist_baton *baton,
2100 const struct attribute *attr);
2102 static void dwarf2_symbol_mark_computed (const struct attribute *attr,
2104 struct dwarf2_cu *cu,
2107 static const gdb_byte *skip_one_die (const struct die_reader_specs *reader,
2108 const gdb_byte *info_ptr,
2109 struct abbrev_info *abbrev);
2111 static void free_stack_comp_unit (void *);
2113 static hashval_t partial_die_hash (const void *item);
2115 static int partial_die_eq (const void *item_lhs, const void *item_rhs);
2117 static struct dwarf2_per_cu_data *dwarf2_find_containing_comp_unit
2118 (sect_offset sect_off, unsigned int offset_in_dwz, struct objfile *objfile);
2120 static void init_one_comp_unit (struct dwarf2_cu *cu,
2121 struct dwarf2_per_cu_data *per_cu);
2123 static void prepare_one_comp_unit (struct dwarf2_cu *cu,
2124 struct die_info *comp_unit_die,
2125 enum language pretend_language);
2127 static void free_heap_comp_unit (void *);
2129 static void free_cached_comp_units (void *);
2131 static void age_cached_comp_units (void);
2133 static void free_one_cached_comp_unit (struct dwarf2_per_cu_data *);
2135 static struct type *set_die_type (struct die_info *, struct type *,
2136 struct dwarf2_cu *);
2138 static void create_all_comp_units (struct objfile *);
2140 static int create_all_type_units (struct objfile *);
2142 static void load_full_comp_unit (struct dwarf2_per_cu_data *,
2145 static void process_full_comp_unit (struct dwarf2_per_cu_data *,
2148 static void process_full_type_unit (struct dwarf2_per_cu_data *,
2151 static void dwarf2_add_dependence (struct dwarf2_cu *,
2152 struct dwarf2_per_cu_data *);
2154 static void dwarf2_mark (struct dwarf2_cu *);
2156 static void dwarf2_clear_marks (struct dwarf2_per_cu_data *);
2158 static struct type *get_die_type_at_offset (sect_offset,
2159 struct dwarf2_per_cu_data *);
2161 static struct type *get_die_type (struct die_info *die, struct dwarf2_cu *cu);
2163 static void dwarf2_release_queue (void *dummy);
2165 static void queue_comp_unit (struct dwarf2_per_cu_data *per_cu,
2166 enum language pretend_language);
2168 static void process_queue (void);
2170 /* The return type of find_file_and_directory. Note, the enclosed
2171 string pointers are only valid while this object is valid. */
2173 struct file_and_directory
2175 /* The filename. This is never NULL. */
2178 /* The compilation directory. NULL if not known. If we needed to
2179 compute a new string, this points to COMP_DIR_STORAGE, otherwise,
2180 points directly to the DW_AT_comp_dir string attribute owned by
2181 the obstack that owns the DIE. */
2182 const char *comp_dir;
2184 /* If we needed to build a new string for comp_dir, this is what
2185 owns the storage. */
2186 std::string comp_dir_storage;
2189 static file_and_directory find_file_and_directory (struct die_info *die,
2190 struct dwarf2_cu *cu);
2192 static char *file_full_name (int file, struct line_header *lh,
2193 const char *comp_dir);
2195 /* Expected enum dwarf_unit_type for read_comp_unit_head. */
2196 enum class rcuh_kind { COMPILE, TYPE };
2198 static const gdb_byte *read_and_check_comp_unit_head
2199 (struct comp_unit_head *header,
2200 struct dwarf2_section_info *section,
2201 struct dwarf2_section_info *abbrev_section, const gdb_byte *info_ptr,
2202 rcuh_kind section_kind);
2204 static void init_cutu_and_read_dies
2205 (struct dwarf2_per_cu_data *this_cu, struct abbrev_table *abbrev_table,
2206 int use_existing_cu, int keep,
2207 die_reader_func_ftype *die_reader_func, void *data);
2209 static void init_cutu_and_read_dies_simple
2210 (struct dwarf2_per_cu_data *this_cu,
2211 die_reader_func_ftype *die_reader_func, void *data);
2213 static htab_t allocate_signatured_type_table (struct objfile *objfile);
2215 static htab_t allocate_dwo_unit_table (struct objfile *objfile);
2217 static struct dwo_unit *lookup_dwo_unit_in_dwp
2218 (struct dwp_file *dwp_file, const char *comp_dir,
2219 ULONGEST signature, int is_debug_types);
2221 static struct dwp_file *get_dwp_file (void);
2223 static struct dwo_unit *lookup_dwo_comp_unit
2224 (struct dwarf2_per_cu_data *, const char *, const char *, ULONGEST);
2226 static struct dwo_unit *lookup_dwo_type_unit
2227 (struct signatured_type *, const char *, const char *);
2229 static void queue_and_load_all_dwo_tus (struct dwarf2_per_cu_data *);
2231 static void free_dwo_file_cleanup (void *);
2233 static void process_cu_includes (void);
2235 static void check_producer (struct dwarf2_cu *cu);
2237 static void free_line_header_voidp (void *arg);
2239 /* Various complaints about symbol reading that don't abort the process. */
2242 dwarf2_statement_list_fits_in_line_number_section_complaint (void)
2244 complaint (&symfile_complaints,
2245 _("statement list doesn't fit in .debug_line section"));
2249 dwarf2_debug_line_missing_file_complaint (void)
2251 complaint (&symfile_complaints,
2252 _(".debug_line section has line data without a file"));
2256 dwarf2_debug_line_missing_end_sequence_complaint (void)
2258 complaint (&symfile_complaints,
2259 _(".debug_line section has line "
2260 "program sequence without an end"));
2264 dwarf2_complex_location_expr_complaint (void)
2266 complaint (&symfile_complaints, _("location expression too complex"));
2270 dwarf2_const_value_length_mismatch_complaint (const char *arg1, int arg2,
2273 complaint (&symfile_complaints,
2274 _("const value length mismatch for '%s', got %d, expected %d"),
2279 dwarf2_section_buffer_overflow_complaint (struct dwarf2_section_info *section)
2281 complaint (&symfile_complaints,
2282 _("debug info runs off end of %s section"
2284 get_section_name (section),
2285 get_section_file_name (section));
2289 dwarf2_macro_malformed_definition_complaint (const char *arg1)
2291 complaint (&symfile_complaints,
2292 _("macro debug info contains a "
2293 "malformed macro definition:\n`%s'"),
2298 dwarf2_invalid_attrib_class_complaint (const char *arg1, const char *arg2)
2300 complaint (&symfile_complaints,
2301 _("invalid attribute class or form for '%s' in '%s'"),
2305 /* Hash function for line_header_hash. */
2308 line_header_hash (const struct line_header *ofs)
2310 return to_underlying (ofs->sect_off) ^ ofs->offset_in_dwz;
2313 /* Hash function for htab_create_alloc_ex for line_header_hash. */
2316 line_header_hash_voidp (const void *item)
2318 const struct line_header *ofs = (const struct line_header *) item;
2320 return line_header_hash (ofs);
2323 /* Equality function for line_header_hash. */
2326 line_header_eq_voidp (const void *item_lhs, const void *item_rhs)
2328 const struct line_header *ofs_lhs = (const struct line_header *) item_lhs;
2329 const struct line_header *ofs_rhs = (const struct line_header *) item_rhs;
2331 return (ofs_lhs->sect_off == ofs_rhs->sect_off
2332 && ofs_lhs->offset_in_dwz == ofs_rhs->offset_in_dwz);
2337 /* Read the given attribute value as an address, taking the attribute's
2338 form into account. */
2341 attr_value_as_address (struct attribute *attr)
2345 if (attr->form != DW_FORM_addr && attr->form != DW_FORM_GNU_addr_index)
2347 /* Aside from a few clearly defined exceptions, attributes that
2348 contain an address must always be in DW_FORM_addr form.
2349 Unfortunately, some compilers happen to be violating this
2350 requirement by encoding addresses using other forms, such
2351 as DW_FORM_data4 for example. For those broken compilers,
2352 we try to do our best, without any guarantee of success,
2353 to interpret the address correctly. It would also be nice
2354 to generate a complaint, but that would require us to maintain
2355 a list of legitimate cases where a non-address form is allowed,
2356 as well as update callers to pass in at least the CU's DWARF
2357 version. This is more overhead than what we're willing to
2358 expand for a pretty rare case. */
2359 addr = DW_UNSND (attr);
2362 addr = DW_ADDR (attr);
2367 /* The suffix for an index file. */
2368 #define INDEX4_SUFFIX ".gdb-index"
2369 #define INDEX5_SUFFIX ".debug_names"
2370 #define DEBUG_STR_SUFFIX ".debug_str"
2372 /* See declaration. */
2374 dwarf2_per_objfile::dwarf2_per_objfile (struct objfile *objfile_,
2375 const dwarf2_debug_sections *names)
2376 : objfile (objfile_)
2379 names = &dwarf2_elf_names;
2381 bfd *obfd = objfile->obfd;
2383 for (asection *sec = obfd->sections; sec != NULL; sec = sec->next)
2384 locate_sections (obfd, sec, *names);
2387 dwarf2_per_objfile::~dwarf2_per_objfile ()
2389 /* Cached DIE trees use xmalloc and the comp_unit_obstack. */
2390 free_cached_comp_units ();
2392 if (quick_file_names_table)
2393 htab_delete (quick_file_names_table);
2395 if (line_header_hash)
2396 htab_delete (line_header_hash);
2398 /* Everything else should be on the objfile obstack. */
2401 /* See declaration. */
2404 dwarf2_per_objfile::free_cached_comp_units ()
2406 dwarf2_per_cu_data *per_cu = read_in_chain;
2407 dwarf2_per_cu_data **last_chain = &read_in_chain;
2408 while (per_cu != NULL)
2410 dwarf2_per_cu_data *next_cu = per_cu->cu->read_in_chain;
2412 free_heap_comp_unit (per_cu->cu);
2413 *last_chain = next_cu;
2418 /* Try to locate the sections we need for DWARF 2 debugging
2419 information and return true if we have enough to do something.
2420 NAMES points to the dwarf2 section names, or is NULL if the standard
2421 ELF names are used. */
2424 dwarf2_has_info (struct objfile *objfile,
2425 const struct dwarf2_debug_sections *names)
2427 if (objfile->flags & OBJF_READNEVER)
2430 dwarf2_per_objfile = ((struct dwarf2_per_objfile *)
2431 objfile_data (objfile, dwarf2_objfile_data_key));
2432 if (!dwarf2_per_objfile)
2434 /* Initialize per-objfile state. */
2435 struct dwarf2_per_objfile *data
2436 = XOBNEW (&objfile->objfile_obstack, struct dwarf2_per_objfile);
2438 dwarf2_per_objfile = new (data) struct dwarf2_per_objfile (objfile, names);
2439 set_objfile_data (objfile, dwarf2_objfile_data_key, dwarf2_per_objfile);
2441 return (!dwarf2_per_objfile->info.is_virtual
2442 && dwarf2_per_objfile->info.s.section != NULL
2443 && !dwarf2_per_objfile->abbrev.is_virtual
2444 && dwarf2_per_objfile->abbrev.s.section != NULL);
2447 /* Return the containing section of virtual section SECTION. */
2449 static struct dwarf2_section_info *
2450 get_containing_section (const struct dwarf2_section_info *section)
2452 gdb_assert (section->is_virtual);
2453 return section->s.containing_section;
2456 /* Return the bfd owner of SECTION. */
2459 get_section_bfd_owner (const struct dwarf2_section_info *section)
2461 if (section->is_virtual)
2463 section = get_containing_section (section);
2464 gdb_assert (!section->is_virtual);
2466 return section->s.section->owner;
2469 /* Return the bfd section of SECTION.
2470 Returns NULL if the section is not present. */
2473 get_section_bfd_section (const struct dwarf2_section_info *section)
2475 if (section->is_virtual)
2477 section = get_containing_section (section);
2478 gdb_assert (!section->is_virtual);
2480 return section->s.section;
2483 /* Return the name of SECTION. */
2486 get_section_name (const struct dwarf2_section_info *section)
2488 asection *sectp = get_section_bfd_section (section);
2490 gdb_assert (sectp != NULL);
2491 return bfd_section_name (get_section_bfd_owner (section), sectp);
2494 /* Return the name of the file SECTION is in. */
2497 get_section_file_name (const struct dwarf2_section_info *section)
2499 bfd *abfd = get_section_bfd_owner (section);
2501 return bfd_get_filename (abfd);
2504 /* Return the id of SECTION.
2505 Returns 0 if SECTION doesn't exist. */
2508 get_section_id (const struct dwarf2_section_info *section)
2510 asection *sectp = get_section_bfd_section (section);
2517 /* Return the flags of SECTION.
2518 SECTION (or containing section if this is a virtual section) must exist. */
2521 get_section_flags (const struct dwarf2_section_info *section)
2523 asection *sectp = get_section_bfd_section (section);
2525 gdb_assert (sectp != NULL);
2526 return bfd_get_section_flags (sectp->owner, sectp);
2529 /* When loading sections, we look either for uncompressed section or for
2530 compressed section names. */
2533 section_is_p (const char *section_name,
2534 const struct dwarf2_section_names *names)
2536 if (names->normal != NULL
2537 && strcmp (section_name, names->normal) == 0)
2539 if (names->compressed != NULL
2540 && strcmp (section_name, names->compressed) == 0)
2545 /* See declaration. */
2548 dwarf2_per_objfile::locate_sections (bfd *abfd, asection *sectp,
2549 const dwarf2_debug_sections &names)
2551 flagword aflag = bfd_get_section_flags (abfd, sectp);
2553 if ((aflag & SEC_HAS_CONTENTS) == 0)
2556 else if (section_is_p (sectp->name, &names.info))
2558 this->info.s.section = sectp;
2559 this->info.size = bfd_get_section_size (sectp);
2561 else if (section_is_p (sectp->name, &names.abbrev))
2563 this->abbrev.s.section = sectp;
2564 this->abbrev.size = bfd_get_section_size (sectp);
2566 else if (section_is_p (sectp->name, &names.line))
2568 this->line.s.section = sectp;
2569 this->line.size = bfd_get_section_size (sectp);
2571 else if (section_is_p (sectp->name, &names.loc))
2573 this->loc.s.section = sectp;
2574 this->loc.size = bfd_get_section_size (sectp);
2576 else if (section_is_p (sectp->name, &names.loclists))
2578 this->loclists.s.section = sectp;
2579 this->loclists.size = bfd_get_section_size (sectp);
2581 else if (section_is_p (sectp->name, &names.macinfo))
2583 this->macinfo.s.section = sectp;
2584 this->macinfo.size = bfd_get_section_size (sectp);
2586 else if (section_is_p (sectp->name, &names.macro))
2588 this->macro.s.section = sectp;
2589 this->macro.size = bfd_get_section_size (sectp);
2591 else if (section_is_p (sectp->name, &names.str))
2593 this->str.s.section = sectp;
2594 this->str.size = bfd_get_section_size (sectp);
2596 else if (section_is_p (sectp->name, &names.line_str))
2598 this->line_str.s.section = sectp;
2599 this->line_str.size = bfd_get_section_size (sectp);
2601 else if (section_is_p (sectp->name, &names.addr))
2603 this->addr.s.section = sectp;
2604 this->addr.size = bfd_get_section_size (sectp);
2606 else if (section_is_p (sectp->name, &names.frame))
2608 this->frame.s.section = sectp;
2609 this->frame.size = bfd_get_section_size (sectp);
2611 else if (section_is_p (sectp->name, &names.eh_frame))
2613 this->eh_frame.s.section = sectp;
2614 this->eh_frame.size = bfd_get_section_size (sectp);
2616 else if (section_is_p (sectp->name, &names.ranges))
2618 this->ranges.s.section = sectp;
2619 this->ranges.size = bfd_get_section_size (sectp);
2621 else if (section_is_p (sectp->name, &names.rnglists))
2623 this->rnglists.s.section = sectp;
2624 this->rnglists.size = bfd_get_section_size (sectp);
2626 else if (section_is_p (sectp->name, &names.types))
2628 struct dwarf2_section_info type_section;
2630 memset (&type_section, 0, sizeof (type_section));
2631 type_section.s.section = sectp;
2632 type_section.size = bfd_get_section_size (sectp);
2634 VEC_safe_push (dwarf2_section_info_def, this->types,
2637 else if (section_is_p (sectp->name, &names.gdb_index))
2639 this->gdb_index.s.section = sectp;
2640 this->gdb_index.size = bfd_get_section_size (sectp);
2642 else if (section_is_p (sectp->name, &names.debug_names))
2644 this->debug_names.s.section = sectp;
2645 this->debug_names.size = bfd_get_section_size (sectp);
2647 else if (section_is_p (sectp->name, &names.debug_aranges))
2649 this->debug_aranges.s.section = sectp;
2650 this->debug_aranges.size = bfd_get_section_size (sectp);
2653 if ((bfd_get_section_flags (abfd, sectp) & (SEC_LOAD | SEC_ALLOC))
2654 && bfd_section_vma (abfd, sectp) == 0)
2655 this->has_section_at_zero = true;
2658 /* A helper function that decides whether a section is empty,
2662 dwarf2_section_empty_p (const struct dwarf2_section_info *section)
2664 if (section->is_virtual)
2665 return section->size == 0;
2666 return section->s.section == NULL || section->size == 0;
2669 /* Read the contents of the section INFO.
2670 OBJFILE is the main object file, but not necessarily the file where
2671 the section comes from. E.g., for DWO files the bfd of INFO is the bfd
2673 If the section is compressed, uncompress it before returning. */
2676 dwarf2_read_section (struct objfile *objfile, struct dwarf2_section_info *info)
2680 gdb_byte *buf, *retbuf;
2684 info->buffer = NULL;
2687 if (dwarf2_section_empty_p (info))
2690 sectp = get_section_bfd_section (info);
2692 /* If this is a virtual section we need to read in the real one first. */
2693 if (info->is_virtual)
2695 struct dwarf2_section_info *containing_section =
2696 get_containing_section (info);
2698 gdb_assert (sectp != NULL);
2699 if ((sectp->flags & SEC_RELOC) != 0)
2701 error (_("Dwarf Error: DWP format V2 with relocations is not"
2702 " supported in section %s [in module %s]"),
2703 get_section_name (info), get_section_file_name (info));
2705 dwarf2_read_section (objfile, containing_section);
2706 /* Other code should have already caught virtual sections that don't
2708 gdb_assert (info->virtual_offset + info->size
2709 <= containing_section->size);
2710 /* If the real section is empty or there was a problem reading the
2711 section we shouldn't get here. */
2712 gdb_assert (containing_section->buffer != NULL);
2713 info->buffer = containing_section->buffer + info->virtual_offset;
2717 /* If the section has relocations, we must read it ourselves.
2718 Otherwise we attach it to the BFD. */
2719 if ((sectp->flags & SEC_RELOC) == 0)
2721 info->buffer = gdb_bfd_map_section (sectp, &info->size);
2725 buf = (gdb_byte *) obstack_alloc (&objfile->objfile_obstack, info->size);
2728 /* When debugging .o files, we may need to apply relocations; see
2729 http://sourceware.org/ml/gdb-patches/2002-04/msg00136.html .
2730 We never compress sections in .o files, so we only need to
2731 try this when the section is not compressed. */
2732 retbuf = symfile_relocate_debug_section (objfile, sectp, buf);
2735 info->buffer = retbuf;
2739 abfd = get_section_bfd_owner (info);
2740 gdb_assert (abfd != NULL);
2742 if (bfd_seek (abfd, sectp->filepos, SEEK_SET) != 0
2743 || bfd_bread (buf, info->size, abfd) != info->size)
2745 error (_("Dwarf Error: Can't read DWARF data"
2746 " in section %s [in module %s]"),
2747 bfd_section_name (abfd, sectp), bfd_get_filename (abfd));
2751 /* A helper function that returns the size of a section in a safe way.
2752 If you are positive that the section has been read before using the
2753 size, then it is safe to refer to the dwarf2_section_info object's
2754 "size" field directly. In other cases, you must call this
2755 function, because for compressed sections the size field is not set
2756 correctly until the section has been read. */
2758 static bfd_size_type
2759 dwarf2_section_size (struct objfile *objfile,
2760 struct dwarf2_section_info *info)
2763 dwarf2_read_section (objfile, info);
2767 /* Fill in SECTP, BUFP and SIZEP with section info, given OBJFILE and
2771 dwarf2_get_section_info (struct objfile *objfile,
2772 enum dwarf2_section_enum sect,
2773 asection **sectp, const gdb_byte **bufp,
2774 bfd_size_type *sizep)
2776 struct dwarf2_per_objfile *data
2777 = (struct dwarf2_per_objfile *) objfile_data (objfile,
2778 dwarf2_objfile_data_key);
2779 struct dwarf2_section_info *info;
2781 /* We may see an objfile without any DWARF, in which case we just
2792 case DWARF2_DEBUG_FRAME:
2793 info = &data->frame;
2795 case DWARF2_EH_FRAME:
2796 info = &data->eh_frame;
2799 gdb_assert_not_reached ("unexpected section");
2802 dwarf2_read_section (objfile, info);
2804 *sectp = get_section_bfd_section (info);
2805 *bufp = info->buffer;
2806 *sizep = info->size;
2809 /* A helper function to find the sections for a .dwz file. */
2812 locate_dwz_sections (bfd *abfd, asection *sectp, void *arg)
2814 struct dwz_file *dwz_file = (struct dwz_file *) arg;
2816 /* Note that we only support the standard ELF names, because .dwz
2817 is ELF-only (at the time of writing). */
2818 if (section_is_p (sectp->name, &dwarf2_elf_names.abbrev))
2820 dwz_file->abbrev.s.section = sectp;
2821 dwz_file->abbrev.size = bfd_get_section_size (sectp);
2823 else if (section_is_p (sectp->name, &dwarf2_elf_names.info))
2825 dwz_file->info.s.section = sectp;
2826 dwz_file->info.size = bfd_get_section_size (sectp);
2828 else if (section_is_p (sectp->name, &dwarf2_elf_names.str))
2830 dwz_file->str.s.section = sectp;
2831 dwz_file->str.size = bfd_get_section_size (sectp);
2833 else if (section_is_p (sectp->name, &dwarf2_elf_names.line))
2835 dwz_file->line.s.section = sectp;
2836 dwz_file->line.size = bfd_get_section_size (sectp);
2838 else if (section_is_p (sectp->name, &dwarf2_elf_names.macro))
2840 dwz_file->macro.s.section = sectp;
2841 dwz_file->macro.size = bfd_get_section_size (sectp);
2843 else if (section_is_p (sectp->name, &dwarf2_elf_names.gdb_index))
2845 dwz_file->gdb_index.s.section = sectp;
2846 dwz_file->gdb_index.size = bfd_get_section_size (sectp);
2848 else if (section_is_p (sectp->name, &dwarf2_elf_names.debug_names))
2850 dwz_file->debug_names.s.section = sectp;
2851 dwz_file->debug_names.size = bfd_get_section_size (sectp);
2855 /* Open the separate '.dwz' debug file, if needed. Return NULL if
2856 there is no .gnu_debugaltlink section in the file. Error if there
2857 is such a section but the file cannot be found. */
2859 static struct dwz_file *
2860 dwarf2_get_dwz_file (void)
2862 const char *filename;
2863 struct dwz_file *result;
2864 bfd_size_type buildid_len_arg;
2868 if (dwarf2_per_objfile->dwz_file != NULL)
2869 return dwarf2_per_objfile->dwz_file;
2871 bfd_set_error (bfd_error_no_error);
2872 gdb::unique_xmalloc_ptr<char> data
2873 (bfd_get_alt_debug_link_info (dwarf2_per_objfile->objfile->obfd,
2874 &buildid_len_arg, &buildid));
2877 if (bfd_get_error () == bfd_error_no_error)
2879 error (_("could not read '.gnu_debugaltlink' section: %s"),
2880 bfd_errmsg (bfd_get_error ()));
2883 gdb::unique_xmalloc_ptr<bfd_byte> buildid_holder (buildid);
2885 buildid_len = (size_t) buildid_len_arg;
2887 filename = data.get ();
2889 std::string abs_storage;
2890 if (!IS_ABSOLUTE_PATH (filename))
2892 gdb::unique_xmalloc_ptr<char> abs
2893 = gdb_realpath (objfile_name (dwarf2_per_objfile->objfile));
2895 abs_storage = ldirname (abs.get ()) + SLASH_STRING + filename;
2896 filename = abs_storage.c_str ();
2899 /* First try the file name given in the section. If that doesn't
2900 work, try to use the build-id instead. */
2901 gdb_bfd_ref_ptr dwz_bfd (gdb_bfd_open (filename, gnutarget, -1));
2902 if (dwz_bfd != NULL)
2904 if (!build_id_verify (dwz_bfd.get (), buildid_len, buildid))
2908 if (dwz_bfd == NULL)
2909 dwz_bfd = build_id_to_debug_bfd (buildid_len, buildid);
2911 if (dwz_bfd == NULL)
2912 error (_("could not find '.gnu_debugaltlink' file for %s"),
2913 objfile_name (dwarf2_per_objfile->objfile));
2915 result = OBSTACK_ZALLOC (&dwarf2_per_objfile->objfile->objfile_obstack,
2917 result->dwz_bfd = dwz_bfd.release ();
2919 bfd_map_over_sections (result->dwz_bfd, locate_dwz_sections, result);
2921 gdb_bfd_record_inclusion (dwarf2_per_objfile->objfile->obfd, result->dwz_bfd);
2922 dwarf2_per_objfile->dwz_file = result;
2926 /* DWARF quick_symbols_functions support. */
2928 /* TUs can share .debug_line entries, and there can be a lot more TUs than
2929 unique line tables, so we maintain a separate table of all .debug_line
2930 derived entries to support the sharing.
2931 All the quick functions need is the list of file names. We discard the
2932 line_header when we're done and don't need to record it here. */
2933 struct quick_file_names
2935 /* The data used to construct the hash key. */
2936 struct stmt_list_hash hash;
2938 /* The number of entries in file_names, real_names. */
2939 unsigned int num_file_names;
2941 /* The file names from the line table, after being run through
2943 const char **file_names;
2945 /* The file names from the line table after being run through
2946 gdb_realpath. These are computed lazily. */
2947 const char **real_names;
2950 /* When using the index (and thus not using psymtabs), each CU has an
2951 object of this type. This is used to hold information needed by
2952 the various "quick" methods. */
2953 struct dwarf2_per_cu_quick_data
2955 /* The file table. This can be NULL if there was no file table
2956 or it's currently not read in.
2957 NOTE: This points into dwarf2_per_objfile->quick_file_names_table. */
2958 struct quick_file_names *file_names;
2960 /* The corresponding symbol table. This is NULL if symbols for this
2961 CU have not yet been read. */
2962 struct compunit_symtab *compunit_symtab;
2964 /* A temporary mark bit used when iterating over all CUs in
2965 expand_symtabs_matching. */
2966 unsigned int mark : 1;
2968 /* True if we've tried to read the file table and found there isn't one.
2969 There will be no point in trying to read it again next time. */
2970 unsigned int no_file_data : 1;
2973 /* Utility hash function for a stmt_list_hash. */
2976 hash_stmt_list_entry (const struct stmt_list_hash *stmt_list_hash)
2980 if (stmt_list_hash->dwo_unit != NULL)
2981 v += (uintptr_t) stmt_list_hash->dwo_unit->dwo_file;
2982 v += to_underlying (stmt_list_hash->line_sect_off);
2986 /* Utility equality function for a stmt_list_hash. */
2989 eq_stmt_list_entry (const struct stmt_list_hash *lhs,
2990 const struct stmt_list_hash *rhs)
2992 if ((lhs->dwo_unit != NULL) != (rhs->dwo_unit != NULL))
2994 if (lhs->dwo_unit != NULL
2995 && lhs->dwo_unit->dwo_file != rhs->dwo_unit->dwo_file)
2998 return lhs->line_sect_off == rhs->line_sect_off;
3001 /* Hash function for a quick_file_names. */
3004 hash_file_name_entry (const void *e)
3006 const struct quick_file_names *file_data
3007 = (const struct quick_file_names *) e;
3009 return hash_stmt_list_entry (&file_data->hash);
3012 /* Equality function for a quick_file_names. */
3015 eq_file_name_entry (const void *a, const void *b)
3017 const struct quick_file_names *ea = (const struct quick_file_names *) a;
3018 const struct quick_file_names *eb = (const struct quick_file_names *) b;
3020 return eq_stmt_list_entry (&ea->hash, &eb->hash);
3023 /* Delete function for a quick_file_names. */
3026 delete_file_name_entry (void *e)
3028 struct quick_file_names *file_data = (struct quick_file_names *) e;
3031 for (i = 0; i < file_data->num_file_names; ++i)
3033 xfree ((void*) file_data->file_names[i]);
3034 if (file_data->real_names)
3035 xfree ((void*) file_data->real_names[i]);
3038 /* The space for the struct itself lives on objfile_obstack,
3039 so we don't free it here. */
3042 /* Create a quick_file_names hash table. */
3045 create_quick_file_names_table (unsigned int nr_initial_entries)
3047 return htab_create_alloc (nr_initial_entries,
3048 hash_file_name_entry, eq_file_name_entry,
3049 delete_file_name_entry, xcalloc, xfree);
3052 /* Read in PER_CU->CU. This function is unrelated to symtabs, symtab would
3053 have to be created afterwards. You should call age_cached_comp_units after
3054 processing PER_CU->CU. dw2_setup must have been already called. */
3057 load_cu (struct dwarf2_per_cu_data *per_cu)
3059 if (per_cu->is_debug_types)
3060 load_full_type_unit (per_cu);
3062 load_full_comp_unit (per_cu, language_minimal);
3064 if (per_cu->cu == NULL)
3065 return; /* Dummy CU. */
3067 dwarf2_find_base_address (per_cu->cu->dies, per_cu->cu);
3070 /* Read in the symbols for PER_CU. */
3073 dw2_do_instantiate_symtab (struct dwarf2_per_cu_data *per_cu)
3075 struct cleanup *back_to;
3077 /* Skip type_unit_groups, reading the type units they contain
3078 is handled elsewhere. */
3079 if (IS_TYPE_UNIT_GROUP (per_cu))
3082 back_to = make_cleanup (dwarf2_release_queue, NULL);
3084 if (dwarf2_per_objfile->using_index
3085 ? per_cu->v.quick->compunit_symtab == NULL
3086 : (per_cu->v.psymtab == NULL || !per_cu->v.psymtab->readin))
3088 queue_comp_unit (per_cu, language_minimal);
3091 /* If we just loaded a CU from a DWO, and we're working with an index
3092 that may badly handle TUs, load all the TUs in that DWO as well.
3093 http://sourceware.org/bugzilla/show_bug.cgi?id=15021 */
3094 if (!per_cu->is_debug_types
3095 && per_cu->cu != NULL
3096 && per_cu->cu->dwo_unit != NULL
3097 && dwarf2_per_objfile->index_table != NULL
3098 && dwarf2_per_objfile->index_table->version <= 7
3099 /* DWP files aren't supported yet. */
3100 && get_dwp_file () == NULL)
3101 queue_and_load_all_dwo_tus (per_cu);
3106 /* Age the cache, releasing compilation units that have not
3107 been used recently. */
3108 age_cached_comp_units ();
3110 do_cleanups (back_to);
3113 /* Ensure that the symbols for PER_CU have been read in. OBJFILE is
3114 the objfile from which this CU came. Returns the resulting symbol
3117 static struct compunit_symtab *
3118 dw2_instantiate_symtab (struct dwarf2_per_cu_data *per_cu)
3120 gdb_assert (dwarf2_per_objfile->using_index);
3121 if (!per_cu->v.quick->compunit_symtab)
3123 struct cleanup *back_to = make_cleanup (free_cached_comp_units, NULL);
3124 scoped_restore decrementer = increment_reading_symtab ();
3125 dw2_do_instantiate_symtab (per_cu);
3126 process_cu_includes ();
3127 do_cleanups (back_to);
3130 return per_cu->v.quick->compunit_symtab;
3133 /* Return the CU/TU given its index.
3135 This is intended for loops like:
3137 for (i = 0; i < (dwarf2_per_objfile->n_comp_units
3138 + dwarf2_per_objfile->n_type_units); ++i)
3140 struct dwarf2_per_cu_data *per_cu = dw2_get_cutu (i);
3146 static struct dwarf2_per_cu_data *
3147 dw2_get_cutu (int index)
3149 if (index >= dwarf2_per_objfile->n_comp_units)
3151 index -= dwarf2_per_objfile->n_comp_units;
3152 gdb_assert (index < dwarf2_per_objfile->n_type_units);
3153 return &dwarf2_per_objfile->all_type_units[index]->per_cu;
3156 return dwarf2_per_objfile->all_comp_units[index];
3159 /* Return the CU given its index.
3160 This differs from dw2_get_cutu in that it's for when you know INDEX
3163 static struct dwarf2_per_cu_data *
3164 dw2_get_cu (int index)
3166 gdb_assert (index >= 0 && index < dwarf2_per_objfile->n_comp_units);
3168 return dwarf2_per_objfile->all_comp_units[index];
3171 /* Return a new dwarf2_per_cu_data allocated on OBJFILE's
3172 objfile_obstack, and constructed with the specified field
3175 static dwarf2_per_cu_data *
3176 create_cu_from_index_list (struct objfile *objfile,
3177 struct dwarf2_section_info *section,
3179 sect_offset sect_off, ULONGEST length)
3181 dwarf2_per_cu_data *the_cu
3182 = OBSTACK_ZALLOC (&objfile->objfile_obstack,
3183 struct dwarf2_per_cu_data);
3184 the_cu->sect_off = sect_off;
3185 the_cu->length = length;
3186 the_cu->objfile = objfile;
3187 the_cu->section = section;
3188 the_cu->v.quick = OBSTACK_ZALLOC (&objfile->objfile_obstack,
3189 struct dwarf2_per_cu_quick_data);
3190 the_cu->is_dwz = is_dwz;
3194 /* A helper for create_cus_from_index that handles a given list of
3198 create_cus_from_index_list (struct objfile *objfile,
3199 const gdb_byte *cu_list, offset_type n_elements,
3200 struct dwarf2_section_info *section,
3206 for (i = 0; i < n_elements; i += 2)
3208 gdb_static_assert (sizeof (ULONGEST) >= 8);
3210 sect_offset sect_off
3211 = (sect_offset) extract_unsigned_integer (cu_list, 8, BFD_ENDIAN_LITTLE);
3212 ULONGEST length = extract_unsigned_integer (cu_list + 8, 8, BFD_ENDIAN_LITTLE);
3215 dwarf2_per_objfile->all_comp_units[base_offset + i / 2]
3216 = create_cu_from_index_list (objfile, section, is_dwz, sect_off, length);
3220 /* Read the CU list from the mapped index, and use it to create all
3221 the CU objects for this objfile. */
3224 create_cus_from_index (struct objfile *objfile,
3225 const gdb_byte *cu_list, offset_type cu_list_elements,
3226 const gdb_byte *dwz_list, offset_type dwz_elements)
3228 struct dwz_file *dwz;
3230 dwarf2_per_objfile->n_comp_units = (cu_list_elements + dwz_elements) / 2;
3231 dwarf2_per_objfile->all_comp_units =
3232 XOBNEWVEC (&objfile->objfile_obstack, struct dwarf2_per_cu_data *,
3233 dwarf2_per_objfile->n_comp_units);
3235 create_cus_from_index_list (objfile, cu_list, cu_list_elements,
3236 &dwarf2_per_objfile->info, 0, 0);
3238 if (dwz_elements == 0)
3241 dwz = dwarf2_get_dwz_file ();
3242 create_cus_from_index_list (objfile, dwz_list, dwz_elements, &dwz->info, 1,
3243 cu_list_elements / 2);
3246 /* Create the signatured type hash table from the index. */
3249 create_signatured_type_table_from_index (struct objfile *objfile,
3250 struct dwarf2_section_info *section,
3251 const gdb_byte *bytes,
3252 offset_type elements)
3255 htab_t sig_types_hash;
3257 dwarf2_per_objfile->n_type_units
3258 = dwarf2_per_objfile->n_allocated_type_units
3260 dwarf2_per_objfile->all_type_units =
3261 XNEWVEC (struct signatured_type *, dwarf2_per_objfile->n_type_units);
3263 sig_types_hash = allocate_signatured_type_table (objfile);
3265 for (i = 0; i < elements; i += 3)
3267 struct signatured_type *sig_type;
3270 cu_offset type_offset_in_tu;
3272 gdb_static_assert (sizeof (ULONGEST) >= 8);
3273 sect_offset sect_off
3274 = (sect_offset) extract_unsigned_integer (bytes, 8, BFD_ENDIAN_LITTLE);
3276 = (cu_offset) extract_unsigned_integer (bytes + 8, 8,
3278 signature = extract_unsigned_integer (bytes + 16, 8, BFD_ENDIAN_LITTLE);
3281 sig_type = OBSTACK_ZALLOC (&objfile->objfile_obstack,
3282 struct signatured_type);
3283 sig_type->signature = signature;
3284 sig_type->type_offset_in_tu = type_offset_in_tu;
3285 sig_type->per_cu.is_debug_types = 1;
3286 sig_type->per_cu.section = section;
3287 sig_type->per_cu.sect_off = sect_off;
3288 sig_type->per_cu.objfile = objfile;
3289 sig_type->per_cu.v.quick
3290 = OBSTACK_ZALLOC (&objfile->objfile_obstack,
3291 struct dwarf2_per_cu_quick_data);
3293 slot = htab_find_slot (sig_types_hash, sig_type, INSERT);
3296 dwarf2_per_objfile->all_type_units[i / 3] = sig_type;
3299 dwarf2_per_objfile->signatured_types = sig_types_hash;
3302 /* Create the signatured type hash table from .debug_names. */
3305 create_signatured_type_table_from_debug_names
3306 (struct objfile *objfile,
3307 const mapped_debug_names &map,
3308 struct dwarf2_section_info *section,
3309 struct dwarf2_section_info *abbrev_section)
3311 dwarf2_read_section (objfile, section);
3312 dwarf2_read_section (objfile, abbrev_section);
3314 dwarf2_per_objfile->n_type_units
3315 = dwarf2_per_objfile->n_allocated_type_units
3317 dwarf2_per_objfile->all_type_units
3318 = XNEWVEC (struct signatured_type *, dwarf2_per_objfile->n_type_units);
3320 htab_t sig_types_hash = allocate_signatured_type_table (objfile);
3322 for (uint32_t i = 0; i < map.tu_count; ++i)
3324 struct signatured_type *sig_type;
3327 cu_offset type_offset_in_tu;
3329 sect_offset sect_off
3330 = (sect_offset) (extract_unsigned_integer
3331 (map.tu_table_reordered + i * map.offset_size,
3333 map.dwarf5_byte_order));
3335 comp_unit_head cu_header;
3336 read_and_check_comp_unit_head (&cu_header, section, abbrev_section,
3337 section->buffer + to_underlying (sect_off),
3340 sig_type = OBSTACK_ZALLOC (&objfile->objfile_obstack,
3341 struct signatured_type);
3342 sig_type->signature = cu_header.signature;
3343 sig_type->type_offset_in_tu = cu_header.type_cu_offset_in_tu;
3344 sig_type->per_cu.is_debug_types = 1;
3345 sig_type->per_cu.section = section;
3346 sig_type->per_cu.sect_off = sect_off;
3347 sig_type->per_cu.objfile = objfile;
3348 sig_type->per_cu.v.quick
3349 = OBSTACK_ZALLOC (&objfile->objfile_obstack,
3350 struct dwarf2_per_cu_quick_data);
3352 slot = htab_find_slot (sig_types_hash, sig_type, INSERT);
3355 dwarf2_per_objfile->all_type_units[i] = sig_type;
3358 dwarf2_per_objfile->signatured_types = sig_types_hash;
3361 /* Read the address map data from the mapped index, and use it to
3362 populate the objfile's psymtabs_addrmap. */
3365 create_addrmap_from_index (struct objfile *objfile, struct mapped_index *index)
3367 struct gdbarch *gdbarch = get_objfile_arch (objfile);
3368 const gdb_byte *iter, *end;
3369 struct addrmap *mutable_map;
3372 auto_obstack temp_obstack;
3374 mutable_map = addrmap_create_mutable (&temp_obstack);
3376 iter = index->address_table.data ();
3377 end = iter + index->address_table.size ();
3379 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
3383 ULONGEST hi, lo, cu_index;
3384 lo = extract_unsigned_integer (iter, 8, BFD_ENDIAN_LITTLE);
3386 hi = extract_unsigned_integer (iter, 8, BFD_ENDIAN_LITTLE);
3388 cu_index = extract_unsigned_integer (iter, 4, BFD_ENDIAN_LITTLE);
3393 complaint (&symfile_complaints,
3394 _(".gdb_index address table has invalid range (%s - %s)"),
3395 hex_string (lo), hex_string (hi));
3399 if (cu_index >= dwarf2_per_objfile->n_comp_units)
3401 complaint (&symfile_complaints,
3402 _(".gdb_index address table has invalid CU number %u"),
3403 (unsigned) cu_index);
3407 lo = gdbarch_adjust_dwarf2_addr (gdbarch, lo + baseaddr);
3408 hi = gdbarch_adjust_dwarf2_addr (gdbarch, hi + baseaddr);
3409 addrmap_set_empty (mutable_map, lo, hi - 1, dw2_get_cutu (cu_index));
3412 objfile->psymtabs_addrmap = addrmap_create_fixed (mutable_map,
3413 &objfile->objfile_obstack);
3416 /* Read the address map data from DWARF-5 .debug_aranges, and use it to
3417 populate the objfile's psymtabs_addrmap. */
3420 create_addrmap_from_aranges (struct objfile *objfile,
3421 struct dwarf2_section_info *section)
3423 bfd *abfd = objfile->obfd;
3424 struct gdbarch *gdbarch = get_objfile_arch (objfile);
3425 const CORE_ADDR baseaddr = ANOFFSET (objfile->section_offsets,
3426 SECT_OFF_TEXT (objfile));
3428 auto_obstack temp_obstack;
3429 addrmap *mutable_map = addrmap_create_mutable (&temp_obstack);
3431 std::unordered_map<sect_offset,
3432 dwarf2_per_cu_data *,
3433 gdb::hash_enum<sect_offset>>
3434 debug_info_offset_to_per_cu;
3435 for (int cui = 0; cui < dwarf2_per_objfile->n_comp_units; ++cui)
3437 dwarf2_per_cu_data *per_cu = dw2_get_cutu (cui);
3438 const auto insertpair
3439 = debug_info_offset_to_per_cu.emplace (per_cu->sect_off, per_cu);
3440 if (!insertpair.second)
3442 warning (_("Section .debug_aranges in %s has duplicate "
3443 "debug_info_offset %u, ignoring .debug_aranges."),
3444 objfile_name (objfile), to_underlying (per_cu->sect_off));
3449 dwarf2_read_section (objfile, section);
3451 const bfd_endian dwarf5_byte_order = gdbarch_byte_order (gdbarch);
3453 const gdb_byte *addr = section->buffer;
3455 while (addr < section->buffer + section->size)
3457 const gdb_byte *const entry_addr = addr;
3458 unsigned int bytes_read;
3460 const LONGEST entry_length = read_initial_length (abfd, addr,
3464 const gdb_byte *const entry_end = addr + entry_length;
3465 const bool dwarf5_is_dwarf64 = bytes_read != 4;
3466 const uint8_t offset_size = dwarf5_is_dwarf64 ? 8 : 4;
3467 if (addr + entry_length > section->buffer + section->size)
3469 warning (_("Section .debug_aranges in %s entry at offset %zu "
3470 "length %s exceeds section length %s, "
3471 "ignoring .debug_aranges."),
3472 objfile_name (objfile), entry_addr - section->buffer,
3473 plongest (bytes_read + entry_length),
3474 pulongest (section->size));
3478 /* The version number. */
3479 const uint16_t version = read_2_bytes (abfd, addr);
3483 warning (_("Section .debug_aranges in %s entry at offset %zu "
3484 "has unsupported version %d, ignoring .debug_aranges."),
3485 objfile_name (objfile), entry_addr - section->buffer,
3490 const uint64_t debug_info_offset
3491 = extract_unsigned_integer (addr, offset_size, dwarf5_byte_order);
3492 addr += offset_size;
3493 const auto per_cu_it
3494 = debug_info_offset_to_per_cu.find (sect_offset (debug_info_offset));
3495 if (per_cu_it == debug_info_offset_to_per_cu.cend ())
3497 warning (_("Section .debug_aranges in %s entry at offset %zu "
3498 "debug_info_offset %s does not exists, "
3499 "ignoring .debug_aranges."),
3500 objfile_name (objfile), entry_addr - section->buffer,
3501 pulongest (debug_info_offset));
3504 dwarf2_per_cu_data *const per_cu = per_cu_it->second;
3506 const uint8_t address_size = *addr++;
3507 if (address_size < 1 || address_size > 8)
3509 warning (_("Section .debug_aranges in %s entry at offset %zu "
3510 "address_size %u is invalid, ignoring .debug_aranges."),
3511 objfile_name (objfile), entry_addr - section->buffer,
3516 const uint8_t segment_selector_size = *addr++;
3517 if (segment_selector_size != 0)
3519 warning (_("Section .debug_aranges in %s entry at offset %zu "
3520 "segment_selector_size %u is not supported, "
3521 "ignoring .debug_aranges."),
3522 objfile_name (objfile), entry_addr - section->buffer,
3523 segment_selector_size);
3527 /* Must pad to an alignment boundary that is twice the address
3528 size. It is undocumented by the DWARF standard but GCC does
3530 for (size_t padding = ((-(addr - section->buffer))
3531 & (2 * address_size - 1));
3532 padding > 0; padding--)
3535 warning (_("Section .debug_aranges in %s entry at offset %zu "
3536 "padding is not zero, ignoring .debug_aranges."),
3537 objfile_name (objfile), entry_addr - section->buffer);
3543 if (addr + 2 * address_size > entry_end)
3545 warning (_("Section .debug_aranges in %s entry at offset %zu "
3546 "address list is not properly terminated, "
3547 "ignoring .debug_aranges."),
3548 objfile_name (objfile), entry_addr - section->buffer);
3551 ULONGEST start = extract_unsigned_integer (addr, address_size,
3553 addr += address_size;
3554 ULONGEST length = extract_unsigned_integer (addr, address_size,
3556 addr += address_size;
3557 if (start == 0 && length == 0)
3559 if (start == 0 && !dwarf2_per_objfile->has_section_at_zero)
3561 /* Symbol was eliminated due to a COMDAT group. */
3564 ULONGEST end = start + length;
3565 start = gdbarch_adjust_dwarf2_addr (gdbarch, start + baseaddr);
3566 end = gdbarch_adjust_dwarf2_addr (gdbarch, end + baseaddr);
3567 addrmap_set_empty (mutable_map, start, end - 1, per_cu);
3571 objfile->psymtabs_addrmap = addrmap_create_fixed (mutable_map,
3572 &objfile->objfile_obstack);
3575 /* The hash function for strings in the mapped index. This is the same as
3576 SYMBOL_HASH_NEXT, but we keep a separate copy to maintain control over the
3577 implementation. This is necessary because the hash function is tied to the
3578 format of the mapped index file. The hash values do not have to match with
3581 Use INT_MAX for INDEX_VERSION if you generate the current index format. */
3584 mapped_index_string_hash (int index_version, const void *p)
3586 const unsigned char *str = (const unsigned char *) p;
3590 while ((c = *str++) != 0)
3592 if (index_version >= 5)
3594 r = r * 67 + c - 113;
3600 /* Find a slot in the mapped index INDEX for the object named NAME.
3601 If NAME is found, set *VEC_OUT to point to the CU vector in the
3602 constant pool and return true. If NAME cannot be found, return
3606 find_slot_in_mapped_hash (struct mapped_index *index, const char *name,
3607 offset_type **vec_out)
3610 offset_type slot, step;
3611 int (*cmp) (const char *, const char *);
3613 gdb::unique_xmalloc_ptr<char> without_params;
3614 if (current_language->la_language == language_cplus
3615 || current_language->la_language == language_fortran
3616 || current_language->la_language == language_d)
3618 /* NAME is already canonical. Drop any qualifiers as .gdb_index does
3621 if (strchr (name, '(') != NULL)
3623 without_params = cp_remove_params (name);
3625 if (without_params != NULL)
3626 name = without_params.get ();
3630 /* Index version 4 did not support case insensitive searches. But the
3631 indices for case insensitive languages are built in lowercase, therefore
3632 simulate our NAME being searched is also lowercased. */
3633 hash = mapped_index_string_hash ((index->version == 4
3634 && case_sensitivity == case_sensitive_off
3635 ? 5 : index->version),
3638 slot = hash & (index->symbol_table.size () - 1);
3639 step = ((hash * 17) & (index->symbol_table.size () - 1)) | 1;
3640 cmp = (case_sensitivity == case_sensitive_on ? strcmp : strcasecmp);
3646 const auto &bucket = index->symbol_table[slot];
3647 if (bucket.name == 0 && bucket.vec == 0)
3650 str = index->constant_pool + MAYBE_SWAP (bucket.name);
3651 if (!cmp (name, str))
3653 *vec_out = (offset_type *) (index->constant_pool
3654 + MAYBE_SWAP (bucket.vec));
3658 slot = (slot + step) & (index->symbol_table.size () - 1);
3662 /* A helper function that reads the .gdb_index from SECTION and fills
3663 in MAP. FILENAME is the name of the file containing the section;
3664 it is used for error reporting. DEPRECATED_OK is nonzero if it is
3665 ok to use deprecated sections.
3667 CU_LIST, CU_LIST_ELEMENTS, TYPES_LIST, and TYPES_LIST_ELEMENTS are
3668 out parameters that are filled in with information about the CU and
3669 TU lists in the section.
3671 Returns 1 if all went well, 0 otherwise. */
3674 read_index_from_section (struct objfile *objfile,
3675 const char *filename,
3677 struct dwarf2_section_info *section,
3678 struct mapped_index *map,
3679 const gdb_byte **cu_list,
3680 offset_type *cu_list_elements,
3681 const gdb_byte **types_list,
3682 offset_type *types_list_elements)
3684 const gdb_byte *addr;
3685 offset_type version;
3686 offset_type *metadata;
3689 if (dwarf2_section_empty_p (section))
3692 /* Older elfutils strip versions could keep the section in the main
3693 executable while splitting it for the separate debug info file. */
3694 if ((get_section_flags (section) & SEC_HAS_CONTENTS) == 0)
3697 dwarf2_read_section (objfile, section);
3699 addr = section->buffer;
3700 /* Version check. */
3701 version = MAYBE_SWAP (*(offset_type *) addr);
3702 /* Versions earlier than 3 emitted every copy of a psymbol. This
3703 causes the index to behave very poorly for certain requests. Version 3
3704 contained incomplete addrmap. So, it seems better to just ignore such
3708 static int warning_printed = 0;
3709 if (!warning_printed)
3711 warning (_("Skipping obsolete .gdb_index section in %s."),
3713 warning_printed = 1;
3717 /* Index version 4 uses a different hash function than index version
3720 Versions earlier than 6 did not emit psymbols for inlined
3721 functions. Using these files will cause GDB not to be able to
3722 set breakpoints on inlined functions by name, so we ignore these
3723 indices unless the user has done
3724 "set use-deprecated-index-sections on". */
3725 if (version < 6 && !deprecated_ok)
3727 static int warning_printed = 0;
3728 if (!warning_printed)
3731 Skipping deprecated .gdb_index section in %s.\n\
3732 Do \"set use-deprecated-index-sections on\" before the file is read\n\
3733 to use the section anyway."),
3735 warning_printed = 1;
3739 /* Version 7 indices generated by gold refer to the CU for a symbol instead
3740 of the TU (for symbols coming from TUs),
3741 http://sourceware.org/bugzilla/show_bug.cgi?id=15021.
3742 Plus gold-generated indices can have duplicate entries for global symbols,
3743 http://sourceware.org/bugzilla/show_bug.cgi?id=15646.
3744 These are just performance bugs, and we can't distinguish gdb-generated
3745 indices from gold-generated ones, so issue no warning here. */
3747 /* Indexes with higher version than the one supported by GDB may be no
3748 longer backward compatible. */
3752 map->version = version;
3753 map->total_size = section->size;
3755 metadata = (offset_type *) (addr + sizeof (offset_type));
3758 *cu_list = addr + MAYBE_SWAP (metadata[i]);
3759 *cu_list_elements = ((MAYBE_SWAP (metadata[i + 1]) - MAYBE_SWAP (metadata[i]))
3763 *types_list = addr + MAYBE_SWAP (metadata[i]);
3764 *types_list_elements = ((MAYBE_SWAP (metadata[i + 1])
3765 - MAYBE_SWAP (metadata[i]))
3769 const gdb_byte *address_table = addr + MAYBE_SWAP (metadata[i]);
3770 const gdb_byte *address_table_end = addr + MAYBE_SWAP (metadata[i + 1]);
3772 = gdb::array_view<const gdb_byte> (address_table, address_table_end);
3775 const gdb_byte *symbol_table = addr + MAYBE_SWAP (metadata[i]);
3776 const gdb_byte *symbol_table_end = addr + MAYBE_SWAP (metadata[i + 1]);
3778 = gdb::array_view<mapped_index::symbol_table_slot>
3779 ((mapped_index::symbol_table_slot *) symbol_table,
3780 (mapped_index::symbol_table_slot *) symbol_table_end);
3783 map->constant_pool = (char *) (addr + MAYBE_SWAP (metadata[i]));
3788 /* Read .gdb_index. If everything went ok, initialize the "quick"
3789 elements of all the CUs and return 1. Otherwise, return 0. */
3792 dwarf2_read_index (struct objfile *objfile)
3794 struct mapped_index local_map, *map;
3795 const gdb_byte *cu_list, *types_list, *dwz_list = NULL;
3796 offset_type cu_list_elements, types_list_elements, dwz_list_elements = 0;
3797 struct dwz_file *dwz;
3799 if (!read_index_from_section (objfile, objfile_name (objfile),
3800 use_deprecated_index_sections,
3801 &dwarf2_per_objfile->gdb_index, &local_map,
3802 &cu_list, &cu_list_elements,
3803 &types_list, &types_list_elements))
3806 /* Don't use the index if it's empty. */
3807 if (local_map.symbol_table.empty ())
3810 /* If there is a .dwz file, read it so we can get its CU list as
3812 dwz = dwarf2_get_dwz_file ();
3815 struct mapped_index dwz_map;
3816 const gdb_byte *dwz_types_ignore;
3817 offset_type dwz_types_elements_ignore;
3819 if (!read_index_from_section (objfile, bfd_get_filename (dwz->dwz_bfd),
3821 &dwz->gdb_index, &dwz_map,
3822 &dwz_list, &dwz_list_elements,
3824 &dwz_types_elements_ignore))
3826 warning (_("could not read '.gdb_index' section from %s; skipping"),
3827 bfd_get_filename (dwz->dwz_bfd));
3832 create_cus_from_index (objfile, cu_list, cu_list_elements, dwz_list,
3835 if (types_list_elements)
3837 struct dwarf2_section_info *section;
3839 /* We can only handle a single .debug_types when we have an
3841 if (VEC_length (dwarf2_section_info_def, dwarf2_per_objfile->types) != 1)
3844 section = VEC_index (dwarf2_section_info_def,
3845 dwarf2_per_objfile->types, 0);
3847 create_signatured_type_table_from_index (objfile, section, types_list,
3848 types_list_elements);
3851 create_addrmap_from_index (objfile, &local_map);
3853 map = XOBNEW (&objfile->objfile_obstack, struct mapped_index);
3854 map = new (map) mapped_index ();
3857 dwarf2_per_objfile->index_table = map;
3858 dwarf2_per_objfile->using_index = 1;
3859 dwarf2_per_objfile->quick_file_names_table =
3860 create_quick_file_names_table (dwarf2_per_objfile->n_comp_units);
3865 /* A helper for the "quick" functions which sets the global
3866 dwarf2_per_objfile according to OBJFILE. */
3869 dw2_setup (struct objfile *objfile)
3871 dwarf2_per_objfile = ((struct dwarf2_per_objfile *)
3872 objfile_data (objfile, dwarf2_objfile_data_key));
3873 gdb_assert (dwarf2_per_objfile);
3876 /* die_reader_func for dw2_get_file_names. */
3879 dw2_get_file_names_reader (const struct die_reader_specs *reader,
3880 const gdb_byte *info_ptr,
3881 struct die_info *comp_unit_die,
3885 struct dwarf2_cu *cu = reader->cu;
3886 struct dwarf2_per_cu_data *this_cu = cu->per_cu;
3887 struct objfile *objfile = dwarf2_per_objfile->objfile;
3888 struct dwarf2_per_cu_data *lh_cu;
3889 struct attribute *attr;
3892 struct quick_file_names *qfn;
3894 gdb_assert (! this_cu->is_debug_types);
3896 /* Our callers never want to match partial units -- instead they
3897 will match the enclosing full CU. */
3898 if (comp_unit_die->tag == DW_TAG_partial_unit)
3900 this_cu->v.quick->no_file_data = 1;
3908 sect_offset line_offset {};
3910 attr = dwarf2_attr (comp_unit_die, DW_AT_stmt_list, cu);
3913 struct quick_file_names find_entry;
3915 line_offset = (sect_offset) DW_UNSND (attr);
3917 /* We may have already read in this line header (TU line header sharing).
3918 If we have we're done. */
3919 find_entry.hash.dwo_unit = cu->dwo_unit;
3920 find_entry.hash.line_sect_off = line_offset;
3921 slot = htab_find_slot (dwarf2_per_objfile->quick_file_names_table,
3922 &find_entry, INSERT);
3925 lh_cu->v.quick->file_names = (struct quick_file_names *) *slot;
3929 lh = dwarf_decode_line_header (line_offset, cu);
3933 lh_cu->v.quick->no_file_data = 1;
3937 qfn = XOBNEW (&objfile->objfile_obstack, struct quick_file_names);
3938 qfn->hash.dwo_unit = cu->dwo_unit;
3939 qfn->hash.line_sect_off = line_offset;
3940 gdb_assert (slot != NULL);
3943 file_and_directory fnd = find_file_and_directory (comp_unit_die, cu);
3945 qfn->num_file_names = lh->file_names.size ();
3947 XOBNEWVEC (&objfile->objfile_obstack, const char *, lh->file_names.size ());
3948 for (i = 0; i < lh->file_names.size (); ++i)
3949 qfn->file_names[i] = file_full_name (i + 1, lh.get (), fnd.comp_dir);
3950 qfn->real_names = NULL;
3952 lh_cu->v.quick->file_names = qfn;
3955 /* A helper for the "quick" functions which attempts to read the line
3956 table for THIS_CU. */
3958 static struct quick_file_names *
3959 dw2_get_file_names (struct dwarf2_per_cu_data *this_cu)
3961 /* This should never be called for TUs. */
3962 gdb_assert (! this_cu->is_debug_types);
3963 /* Nor type unit groups. */
3964 gdb_assert (! IS_TYPE_UNIT_GROUP (this_cu));
3966 if (this_cu->v.quick->file_names != NULL)
3967 return this_cu->v.quick->file_names;
3968 /* If we know there is no line data, no point in looking again. */
3969 if (this_cu->v.quick->no_file_data)
3972 init_cutu_and_read_dies_simple (this_cu, dw2_get_file_names_reader, NULL);
3974 if (this_cu->v.quick->no_file_data)
3976 return this_cu->v.quick->file_names;
3979 /* A helper for the "quick" functions which computes and caches the
3980 real path for a given file name from the line table. */
3983 dw2_get_real_path (struct objfile *objfile,
3984 struct quick_file_names *qfn, int index)
3986 if (qfn->real_names == NULL)
3987 qfn->real_names = OBSTACK_CALLOC (&objfile->objfile_obstack,
3988 qfn->num_file_names, const char *);
3990 if (qfn->real_names[index] == NULL)
3991 qfn->real_names[index] = gdb_realpath (qfn->file_names[index]).release ();
3993 return qfn->real_names[index];
3996 static struct symtab *
3997 dw2_find_last_source_symtab (struct objfile *objfile)
3999 struct compunit_symtab *cust;
4002 dw2_setup (objfile);
4003 index = dwarf2_per_objfile->n_comp_units - 1;
4004 cust = dw2_instantiate_symtab (dw2_get_cutu (index));
4007 return compunit_primary_filetab (cust);
4010 /* Traversal function for dw2_forget_cached_source_info. */
4013 dw2_free_cached_file_names (void **slot, void *info)
4015 struct quick_file_names *file_data = (struct quick_file_names *) *slot;
4017 if (file_data->real_names)
4021 for (i = 0; i < file_data->num_file_names; ++i)
4023 xfree ((void*) file_data->real_names[i]);
4024 file_data->real_names[i] = NULL;
4032 dw2_forget_cached_source_info (struct objfile *objfile)
4034 dw2_setup (objfile);
4036 htab_traverse_noresize (dwarf2_per_objfile->quick_file_names_table,
4037 dw2_free_cached_file_names, NULL);
4040 /* Helper function for dw2_map_symtabs_matching_filename that expands
4041 the symtabs and calls the iterator. */
4044 dw2_map_expand_apply (struct objfile *objfile,
4045 struct dwarf2_per_cu_data *per_cu,
4046 const char *name, const char *real_path,
4047 gdb::function_view<bool (symtab *)> callback)
4049 struct compunit_symtab *last_made = objfile->compunit_symtabs;
4051 /* Don't visit already-expanded CUs. */
4052 if (per_cu->v.quick->compunit_symtab)
4055 /* This may expand more than one symtab, and we want to iterate over
4057 dw2_instantiate_symtab (per_cu);
4059 return iterate_over_some_symtabs (name, real_path, objfile->compunit_symtabs,
4060 last_made, callback);
4063 /* Implementation of the map_symtabs_matching_filename method. */
4066 dw2_map_symtabs_matching_filename
4067 (struct objfile *objfile, const char *name, const char *real_path,
4068 gdb::function_view<bool (symtab *)> callback)
4071 const char *name_basename = lbasename (name);
4073 dw2_setup (objfile);
4075 /* The rule is CUs specify all the files, including those used by
4076 any TU, so there's no need to scan TUs here. */
4078 for (i = 0; i < dwarf2_per_objfile->n_comp_units; ++i)
4081 struct dwarf2_per_cu_data *per_cu = dw2_get_cu (i);
4082 struct quick_file_names *file_data;
4084 /* We only need to look at symtabs not already expanded. */
4085 if (per_cu->v.quick->compunit_symtab)
4088 file_data = dw2_get_file_names (per_cu);
4089 if (file_data == NULL)
4092 for (j = 0; j < file_data->num_file_names; ++j)
4094 const char *this_name = file_data->file_names[j];
4095 const char *this_real_name;
4097 if (compare_filenames_for_search (this_name, name))
4099 if (dw2_map_expand_apply (objfile, per_cu, name, real_path,
4105 /* Before we invoke realpath, which can get expensive when many
4106 files are involved, do a quick comparison of the basenames. */
4107 if (! basenames_may_differ
4108 && FILENAME_CMP (lbasename (this_name), name_basename) != 0)
4111 this_real_name = dw2_get_real_path (objfile, file_data, j);
4112 if (compare_filenames_for_search (this_real_name, name))
4114 if (dw2_map_expand_apply (objfile, per_cu, name, real_path,
4120 if (real_path != NULL)
4122 gdb_assert (IS_ABSOLUTE_PATH (real_path));
4123 gdb_assert (IS_ABSOLUTE_PATH (name));
4124 if (this_real_name != NULL
4125 && FILENAME_CMP (real_path, this_real_name) == 0)
4127 if (dw2_map_expand_apply (objfile, per_cu, name, real_path,
4139 /* Struct used to manage iterating over all CUs looking for a symbol. */
4141 struct dw2_symtab_iterator
4143 /* The internalized form of .gdb_index. */
4144 struct mapped_index *index;
4145 /* If non-zero, only look for symbols that match BLOCK_INDEX. */
4146 int want_specific_block;
4147 /* One of GLOBAL_BLOCK or STATIC_BLOCK.
4148 Unused if !WANT_SPECIFIC_BLOCK. */
4150 /* The kind of symbol we're looking for. */
4152 /* The list of CUs from the index entry of the symbol,
4153 or NULL if not found. */
4155 /* The next element in VEC to look at. */
4157 /* The number of elements in VEC, or zero if there is no match. */
4159 /* Have we seen a global version of the symbol?
4160 If so we can ignore all further global instances.
4161 This is to work around gold/15646, inefficient gold-generated
4166 /* Initialize the index symtab iterator ITER.
4167 If WANT_SPECIFIC_BLOCK is non-zero, only look for symbols
4168 in block BLOCK_INDEX. Otherwise BLOCK_INDEX is ignored. */
4171 dw2_symtab_iter_init (struct dw2_symtab_iterator *iter,
4172 struct mapped_index *index,
4173 int want_specific_block,
4178 iter->index = index;
4179 iter->want_specific_block = want_specific_block;
4180 iter->block_index = block_index;
4181 iter->domain = domain;
4183 iter->global_seen = 0;
4185 if (find_slot_in_mapped_hash (index, name, &iter->vec))
4186 iter->length = MAYBE_SWAP (*iter->vec);
4194 /* Return the next matching CU or NULL if there are no more. */
4196 static struct dwarf2_per_cu_data *
4197 dw2_symtab_iter_next (struct dw2_symtab_iterator *iter)
4199 for ( ; iter->next < iter->length; ++iter->next)
4201 offset_type cu_index_and_attrs =
4202 MAYBE_SWAP (iter->vec[iter->next + 1]);
4203 offset_type cu_index = GDB_INDEX_CU_VALUE (cu_index_and_attrs);
4204 struct dwarf2_per_cu_data *per_cu;
4205 int want_static = iter->block_index != GLOBAL_BLOCK;
4206 /* This value is only valid for index versions >= 7. */
4207 int is_static = GDB_INDEX_SYMBOL_STATIC_VALUE (cu_index_and_attrs);
4208 gdb_index_symbol_kind symbol_kind =
4209 GDB_INDEX_SYMBOL_KIND_VALUE (cu_index_and_attrs);
4210 /* Only check the symbol attributes if they're present.
4211 Indices prior to version 7 don't record them,
4212 and indices >= 7 may elide them for certain symbols
4213 (gold does this). */
4215 (iter->index->version >= 7
4216 && symbol_kind != GDB_INDEX_SYMBOL_KIND_NONE);
4218 /* Don't crash on bad data. */
4219 if (cu_index >= (dwarf2_per_objfile->n_comp_units
4220 + dwarf2_per_objfile->n_type_units))
4222 complaint (&symfile_complaints,
4223 _(".gdb_index entry has bad CU index"
4225 objfile_name (dwarf2_per_objfile->objfile));
4229 per_cu = dw2_get_cutu (cu_index);
4231 /* Skip if already read in. */
4232 if (per_cu->v.quick->compunit_symtab)
4235 /* Check static vs global. */
4238 if (iter->want_specific_block
4239 && want_static != is_static)
4241 /* Work around gold/15646. */
4242 if (!is_static && iter->global_seen)
4245 iter->global_seen = 1;
4248 /* Only check the symbol's kind if it has one. */
4251 switch (iter->domain)
4254 if (symbol_kind != GDB_INDEX_SYMBOL_KIND_VARIABLE
4255 && symbol_kind != GDB_INDEX_SYMBOL_KIND_FUNCTION
4256 /* Some types are also in VAR_DOMAIN. */
4257 && symbol_kind != GDB_INDEX_SYMBOL_KIND_TYPE)
4261 if (symbol_kind != GDB_INDEX_SYMBOL_KIND_TYPE)
4265 if (symbol_kind != GDB_INDEX_SYMBOL_KIND_OTHER)
4280 static struct compunit_symtab *
4281 dw2_lookup_symbol (struct objfile *objfile, int block_index,
4282 const char *name, domain_enum domain)
4284 struct compunit_symtab *stab_best = NULL;
4285 struct mapped_index *index;
4287 dw2_setup (objfile);
4289 lookup_name_info lookup_name (name, symbol_name_match_type::FULL);
4291 index = dwarf2_per_objfile->index_table;
4293 /* index is NULL if OBJF_READNOW. */
4296 struct dw2_symtab_iterator iter;
4297 struct dwarf2_per_cu_data *per_cu;
4299 dw2_symtab_iter_init (&iter, index, 1, block_index, domain, name);
4301 while ((per_cu = dw2_symtab_iter_next (&iter)) != NULL)
4303 struct symbol *sym, *with_opaque = NULL;
4304 struct compunit_symtab *stab = dw2_instantiate_symtab (per_cu);
4305 const struct blockvector *bv = COMPUNIT_BLOCKVECTOR (stab);
4306 struct block *block = BLOCKVECTOR_BLOCK (bv, block_index);
4308 sym = block_find_symbol (block, name, domain,
4309 block_find_non_opaque_type_preferred,
4312 /* Some caution must be observed with overloaded functions
4313 and methods, since the index will not contain any overload
4314 information (but NAME might contain it). */
4317 && SYMBOL_MATCHES_SEARCH_NAME (sym, lookup_name))
4319 if (with_opaque != NULL
4320 && SYMBOL_MATCHES_SEARCH_NAME (with_opaque, lookup_name))
4323 /* Keep looking through other CUs. */
4331 dw2_print_stats (struct objfile *objfile)
4333 int i, total, count;
4335 dw2_setup (objfile);
4336 total = dwarf2_per_objfile->n_comp_units + dwarf2_per_objfile->n_type_units;
4338 for (i = 0; i < total; ++i)
4340 struct dwarf2_per_cu_data *per_cu = dw2_get_cutu (i);
4342 if (!per_cu->v.quick->compunit_symtab)
4345 printf_filtered (_(" Number of read CUs: %d\n"), total - count);
4346 printf_filtered (_(" Number of unread CUs: %d\n"), count);
4349 /* This dumps minimal information about the index.
4350 It is called via "mt print objfiles".
4351 One use is to verify .gdb_index has been loaded by the
4352 gdb.dwarf2/gdb-index.exp testcase. */
4355 dw2_dump (struct objfile *objfile)
4357 dw2_setup (objfile);
4358 gdb_assert (dwarf2_per_objfile->using_index);
4359 printf_filtered (".gdb_index:");
4360 if (dwarf2_per_objfile->index_table != NULL)
4362 printf_filtered (" version %d\n",
4363 dwarf2_per_objfile->index_table->version);
4366 printf_filtered (" faked for \"readnow\"\n");
4367 printf_filtered ("\n");
4371 dw2_relocate (struct objfile *objfile,
4372 const struct section_offsets *new_offsets,
4373 const struct section_offsets *delta)
4375 /* There's nothing to relocate here. */
4379 dw2_expand_symtabs_for_function (struct objfile *objfile,
4380 const char *func_name)
4382 struct mapped_index *index;
4384 dw2_setup (objfile);
4386 index = dwarf2_per_objfile->index_table;
4388 /* index is NULL if OBJF_READNOW. */
4391 struct dw2_symtab_iterator iter;
4392 struct dwarf2_per_cu_data *per_cu;
4394 /* Note: It doesn't matter what we pass for block_index here. */
4395 dw2_symtab_iter_init (&iter, index, 0, GLOBAL_BLOCK, VAR_DOMAIN,
4398 while ((per_cu = dw2_symtab_iter_next (&iter)) != NULL)
4399 dw2_instantiate_symtab (per_cu);
4404 dw2_expand_all_symtabs (struct objfile *objfile)
4408 dw2_setup (objfile);
4410 for (i = 0; i < (dwarf2_per_objfile->n_comp_units
4411 + dwarf2_per_objfile->n_type_units); ++i)
4413 struct dwarf2_per_cu_data *per_cu = dw2_get_cutu (i);
4415 dw2_instantiate_symtab (per_cu);
4420 dw2_expand_symtabs_with_fullname (struct objfile *objfile,
4421 const char *fullname)
4425 dw2_setup (objfile);
4427 /* We don't need to consider type units here.
4428 This is only called for examining code, e.g. expand_line_sal.
4429 There can be an order of magnitude (or more) more type units
4430 than comp units, and we avoid them if we can. */
4432 for (i = 0; i < dwarf2_per_objfile->n_comp_units; ++i)
4435 struct dwarf2_per_cu_data *per_cu = dw2_get_cutu (i);
4436 struct quick_file_names *file_data;
4438 /* We only need to look at symtabs not already expanded. */
4439 if (per_cu->v.quick->compunit_symtab)
4442 file_data = dw2_get_file_names (per_cu);
4443 if (file_data == NULL)
4446 for (j = 0; j < file_data->num_file_names; ++j)
4448 const char *this_fullname = file_data->file_names[j];
4450 if (filename_cmp (this_fullname, fullname) == 0)
4452 dw2_instantiate_symtab (per_cu);
4460 dw2_map_matching_symbols (struct objfile *objfile,
4461 const char * name, domain_enum domain,
4463 int (*callback) (struct block *,
4464 struct symbol *, void *),
4465 void *data, symbol_name_match_type match,
4466 symbol_compare_ftype *ordered_compare)
4468 /* Currently unimplemented; used for Ada. The function can be called if the
4469 current language is Ada for a non-Ada objfile using GNU index. As Ada
4470 does not look for non-Ada symbols this function should just return. */
4473 /* Symbol name matcher for .gdb_index names.
4475 Symbol names in .gdb_index have a few particularities:
4477 - There's no indication of which is the language of each symbol.
4479 Since each language has its own symbol name matching algorithm,
4480 and we don't know which language is the right one, we must match
4481 each symbol against all languages. This would be a potential
4482 performance problem if it were not mitigated by the
4483 mapped_index::name_components lookup table, which significantly
4484 reduces the number of times we need to call into this matcher,
4485 making it a non-issue.
4487 - Symbol names in the index have no overload (parameter)
4488 information. I.e., in C++, "foo(int)" and "foo(long)" both
4489 appear as "foo" in the index, for example.
4491 This means that the lookup names passed to the symbol name
4492 matcher functions must have no parameter information either
4493 because (e.g.) symbol search name "foo" does not match
4494 lookup-name "foo(int)" [while swapping search name for lookup
4497 class gdb_index_symbol_name_matcher
4500 /* Prepares the vector of comparison functions for LOOKUP_NAME. */
4501 gdb_index_symbol_name_matcher (const lookup_name_info &lookup_name);
4503 /* Walk all the matcher routines and match SYMBOL_NAME against them.
4504 Returns true if any matcher matches. */
4505 bool matches (const char *symbol_name);
4508 /* A reference to the lookup name we're matching against. */
4509 const lookup_name_info &m_lookup_name;
4511 /* A vector holding all the different symbol name matchers, for all
4513 std::vector<symbol_name_matcher_ftype *> m_symbol_name_matcher_funcs;
4516 gdb_index_symbol_name_matcher::gdb_index_symbol_name_matcher
4517 (const lookup_name_info &lookup_name)
4518 : m_lookup_name (lookup_name)
4520 /* Prepare the vector of comparison functions upfront, to avoid
4521 doing the same work for each symbol. Care is taken to avoid
4522 matching with the same matcher more than once if/when multiple
4523 languages use the same matcher function. */
4524 auto &matchers = m_symbol_name_matcher_funcs;
4525 matchers.reserve (nr_languages);
4527 matchers.push_back (default_symbol_name_matcher);
4529 for (int i = 0; i < nr_languages; i++)
4531 const language_defn *lang = language_def ((enum language) i);
4532 if (lang->la_get_symbol_name_matcher != NULL)
4534 symbol_name_matcher_ftype *name_matcher
4535 = lang->la_get_symbol_name_matcher (m_lookup_name);
4537 /* Don't insert the same comparison routine more than once.
4538 Note that we do this linear walk instead of a cheaper
4539 sorted insert, or use a std::set or something like that,
4540 because relative order of function addresses is not
4541 stable. This is not a problem in practice because the
4542 number of supported languages is low, and the cost here
4543 is tiny compared to the number of searches we'll do
4544 afterwards using this object. */
4545 if (std::find (matchers.begin (), matchers.end (), name_matcher)
4547 matchers.push_back (name_matcher);
4553 gdb_index_symbol_name_matcher::matches (const char *symbol_name)
4555 for (auto matches_name : m_symbol_name_matcher_funcs)
4556 if (matches_name (symbol_name, m_lookup_name, NULL))
4562 /* Starting from a search name, return the string that finds the upper
4563 bound of all strings that start with SEARCH_NAME in a sorted name
4564 list. Returns the empty string to indicate that the upper bound is
4565 the end of the list. */
4568 make_sort_after_prefix_name (const char *search_name)
4570 /* When looking to complete "func", we find the upper bound of all
4571 symbols that start with "func" by looking for where we'd insert
4572 the closest string that would follow "func" in lexicographical
4573 order. Usually, that's "func"-with-last-character-incremented,
4574 i.e. "fund". Mind non-ASCII characters, though. Usually those
4575 will be UTF-8 multi-byte sequences, but we can't be certain.
4576 Especially mind the 0xff character, which is a valid character in
4577 non-UTF-8 source character sets (e.g. Latin1 'ÿ'), and we can't
4578 rule out compilers allowing it in identifiers. Note that
4579 conveniently, strcmp/strcasecmp are specified to compare
4580 characters interpreted as unsigned char. So what we do is treat
4581 the whole string as a base 256 number composed of a sequence of
4582 base 256 "digits" and add 1 to it. I.e., adding 1 to 0xff wraps
4583 to 0, and carries 1 to the following more-significant position.
4584 If the very first character in SEARCH_NAME ends up incremented
4585 and carries/overflows, then the upper bound is the end of the
4586 list. The string after the empty string is also the empty
4589 Some examples of this operation:
4591 SEARCH_NAME => "+1" RESULT
4595 "\xff" "a" "\xff" => "\xff" "b"
4600 Then, with these symbols for example:
4606 completing "func" looks for symbols between "func" and
4607 "func"-with-last-character-incremented, i.e. "fund" (exclusive),
4608 which finds "func" and "func1", but not "fund".
4612 funcÿ (Latin1 'ÿ' [0xff])
4616 completing "funcÿ" looks for symbols between "funcÿ" and "fund"
4617 (exclusive), which finds "funcÿ" and "funcÿ1", but not "fund".
4621 ÿÿ (Latin1 'ÿ' [0xff])
4624 completing "ÿ" or "ÿÿ" looks for symbols between between "ÿÿ" and
4625 the end of the list.
4627 std::string after = search_name;
4628 while (!after.empty () && (unsigned char) after.back () == 0xff)
4630 if (!after.empty ())
4631 after.back () = (unsigned char) after.back () + 1;
4635 /* See declaration. */
4637 std::pair<std::vector<name_component>::const_iterator,
4638 std::vector<name_component>::const_iterator>
4639 mapped_index_base::find_name_components_bounds
4640 (const lookup_name_info &lookup_name_without_params) const
4643 = this->name_components_casing == case_sensitive_on ? strcmp : strcasecmp;
4646 = lookup_name_without_params.cplus ().lookup_name ().c_str ();
4648 /* Comparison function object for lower_bound that matches against a
4649 given symbol name. */
4650 auto lookup_compare_lower = [&] (const name_component &elem,
4653 const char *elem_qualified = this->symbol_name_at (elem.idx);
4654 const char *elem_name = elem_qualified + elem.name_offset;
4655 return name_cmp (elem_name, name) < 0;
4658 /* Comparison function object for upper_bound that matches against a
4659 given symbol name. */
4660 auto lookup_compare_upper = [&] (const char *name,
4661 const name_component &elem)
4663 const char *elem_qualified = this->symbol_name_at (elem.idx);
4664 const char *elem_name = elem_qualified + elem.name_offset;
4665 return name_cmp (name, elem_name) < 0;
4668 auto begin = this->name_components.begin ();
4669 auto end = this->name_components.end ();
4671 /* Find the lower bound. */
4674 if (lookup_name_without_params.completion_mode () && cplus[0] == '\0')
4677 return std::lower_bound (begin, end, cplus, lookup_compare_lower);
4680 /* Find the upper bound. */
4683 if (lookup_name_without_params.completion_mode ())
4685 /* In completion mode, we want UPPER to point past all
4686 symbols names that have the same prefix. I.e., with
4687 these symbols, and completing "func":
4689 function << lower bound
4691 other_function << upper bound
4693 We find the upper bound by looking for the insertion
4694 point of "func"-with-last-character-incremented,
4696 std::string after = make_sort_after_prefix_name (cplus);
4699 return std::lower_bound (lower, end, after.c_str (),
4700 lookup_compare_lower);
4703 return std::upper_bound (lower, end, cplus, lookup_compare_upper);
4706 return {lower, upper};
4709 /* See declaration. */
4712 mapped_index_base::build_name_components ()
4714 if (!this->name_components.empty ())
4717 this->name_components_casing = case_sensitivity;
4719 = this->name_components_casing == case_sensitive_on ? strcmp : strcasecmp;
4721 /* The code below only knows how to break apart components of C++
4722 symbol names (and other languages that use '::' as
4723 namespace/module separator). If we add support for wild matching
4724 to some language that uses some other operator (E.g., Ada, Go and
4725 D use '.'), then we'll need to try splitting the symbol name
4726 according to that language too. Note that Ada does support wild
4727 matching, but doesn't currently support .gdb_index. */
4728 auto count = this->symbol_name_count ();
4729 for (offset_type idx = 0; idx < count; idx++)
4731 if (this->symbol_name_slot_invalid (idx))
4734 const char *name = this->symbol_name_at (idx);
4736 /* Add each name component to the name component table. */
4737 unsigned int previous_len = 0;
4738 for (unsigned int current_len = cp_find_first_component (name);
4739 name[current_len] != '\0';
4740 current_len += cp_find_first_component (name + current_len))
4742 gdb_assert (name[current_len] == ':');
4743 this->name_components.push_back ({previous_len, idx});
4744 /* Skip the '::'. */
4746 previous_len = current_len;
4748 this->name_components.push_back ({previous_len, idx});
4751 /* Sort name_components elements by name. */
4752 auto name_comp_compare = [&] (const name_component &left,
4753 const name_component &right)
4755 const char *left_qualified = this->symbol_name_at (left.idx);
4756 const char *right_qualified = this->symbol_name_at (right.idx);
4758 const char *left_name = left_qualified + left.name_offset;
4759 const char *right_name = right_qualified + right.name_offset;
4761 return name_cmp (left_name, right_name) < 0;
4764 std::sort (this->name_components.begin (),
4765 this->name_components.end (),
4769 /* Helper for dw2_expand_symtabs_matching that works with a
4770 mapped_index_base instead of the containing objfile. This is split
4771 to a separate function in order to be able to unit test the
4772 name_components matching using a mock mapped_index_base. For each
4773 symbol name that matches, calls MATCH_CALLBACK, passing it the
4774 symbol's index in the mapped_index_base symbol table. */
4777 dw2_expand_symtabs_matching_symbol
4778 (mapped_index_base &index,
4779 const lookup_name_info &lookup_name_in,
4780 gdb::function_view<expand_symtabs_symbol_matcher_ftype> symbol_matcher,
4781 enum search_domain kind,
4782 gdb::function_view<void (offset_type)> match_callback)
4784 lookup_name_info lookup_name_without_params
4785 = lookup_name_in.make_ignore_params ();
4786 gdb_index_symbol_name_matcher lookup_name_matcher
4787 (lookup_name_without_params);
4789 /* Build the symbol name component sorted vector, if we haven't
4791 index.build_name_components ();
4793 auto bounds = index.find_name_components_bounds (lookup_name_without_params);
4795 /* Now for each symbol name in range, check to see if we have a name
4796 match, and if so, call the MATCH_CALLBACK callback. */
4798 /* The same symbol may appear more than once in the range though.
4799 E.g., if we're looking for symbols that complete "w", and we have
4800 a symbol named "w1::w2", we'll find the two name components for
4801 that same symbol in the range. To be sure we only call the
4802 callback once per symbol, we first collect the symbol name
4803 indexes that matched in a temporary vector and ignore
4805 std::vector<offset_type> matches;
4806 matches.reserve (std::distance (bounds.first, bounds.second));
4808 for (; bounds.first != bounds.second; ++bounds.first)
4810 const char *qualified = index.symbol_name_at (bounds.first->idx);
4812 if (!lookup_name_matcher.matches (qualified)
4813 || (symbol_matcher != NULL && !symbol_matcher (qualified)))
4816 matches.push_back (bounds.first->idx);
4819 std::sort (matches.begin (), matches.end ());
4821 /* Finally call the callback, once per match. */
4823 for (offset_type idx : matches)
4827 match_callback (idx);
4832 /* Above we use a type wider than idx's for 'prev', since 0 and
4833 (offset_type)-1 are both possible values. */
4834 static_assert (sizeof (prev) > sizeof (offset_type), "");
4839 namespace selftests { namespace dw2_expand_symtabs_matching {
4841 /* A wrapper around mapped_index that builds a mock mapped_index, from
4842 the symbol list passed as parameter to the constructor. */
4843 class mock_mapped_index
4847 mock_mapped_index (const char *(&symbols)[N])
4848 : mock_mapped_index (symbols, N)
4851 /* Access the built index. */
4852 mapped_index &index ()
4856 mock_mapped_index(const mock_mapped_index &) = delete;
4857 void operator= (const mock_mapped_index &) = delete;
4860 mock_mapped_index (const char **symbols, size_t symbols_size)
4862 /* No string can live at offset zero. Add a dummy entry. */
4863 obstack_grow_str0 (&m_constant_pool, "");
4865 for (size_t i = 0; i < symbols_size; i++)
4867 const char *sym = symbols[i];
4868 size_t offset = obstack_object_size (&m_constant_pool);
4869 obstack_grow_str0 (&m_constant_pool, sym);
4870 m_symbol_table.push_back ({offset, 0});
4873 m_index.constant_pool = (const char *) obstack_base (&m_constant_pool);
4874 m_index.symbol_table = m_symbol_table;
4878 /* The built mapped_index. */
4879 mapped_index m_index{};
4881 /* The storage that the built mapped_index uses for symbol and
4882 constant pool tables. */
4883 std::vector<mapped_index::symbol_table_slot> m_symbol_table;
4884 auto_obstack m_constant_pool;
4887 /* Convenience function that converts a NULL pointer to a "<null>"
4888 string, to pass to print routines. */
4891 string_or_null (const char *str)
4893 return str != NULL ? str : "<null>";
4896 /* Check if a lookup_name_info built from
4897 NAME/MATCH_TYPE/COMPLETION_MODE matches the symbols in the mock
4898 index. EXPECTED_LIST is the list of expected matches, in expected
4899 matching order. If no match expected, then an empty list is
4900 specified. Returns true on success. On failure prints a warning
4901 indicating the file:line that failed, and returns false. */
4904 check_match (const char *file, int line,
4905 mock_mapped_index &mock_index,
4906 const char *name, symbol_name_match_type match_type,
4907 bool completion_mode,
4908 std::initializer_list<const char *> expected_list)
4910 lookup_name_info lookup_name (name, match_type, completion_mode);
4912 bool matched = true;
4914 auto mismatch = [&] (const char *expected_str,
4917 warning (_("%s:%d: match_type=%s, looking-for=\"%s\", "
4918 "expected=\"%s\", got=\"%s\"\n"),
4920 (match_type == symbol_name_match_type::FULL
4922 name, string_or_null (expected_str), string_or_null (got));
4926 auto expected_it = expected_list.begin ();
4927 auto expected_end = expected_list.end ();
4929 dw2_expand_symtabs_matching_symbol (mock_index.index (), lookup_name,
4931 [&] (offset_type idx)
4933 const char *matched_name = mock_index.index ().symbol_name_at (idx);
4934 const char *expected_str
4935 = expected_it == expected_end ? NULL : *expected_it++;
4937 if (expected_str == NULL || strcmp (expected_str, matched_name) != 0)
4938 mismatch (expected_str, matched_name);
4941 const char *expected_str
4942 = expected_it == expected_end ? NULL : *expected_it++;
4943 if (expected_str != NULL)
4944 mismatch (expected_str, NULL);
4949 /* The symbols added to the mock mapped_index for testing (in
4951 static const char *test_symbols[] = {
4960 "ns2::tmpl<int>::foo2",
4961 "(anonymous namespace)::A::B::C",
4963 /* These are used to check that the increment-last-char in the
4964 matching algorithm for completion doesn't match "t1_fund" when
4965 completing "t1_func". */
4971 /* A UTF-8 name with multi-byte sequences to make sure that
4972 cp-name-parser understands this as a single identifier ("função"
4973 is "function" in PT). */
4976 /* \377 (0xff) is Latin1 'ÿ'. */
4979 /* \377 (0xff) is Latin1 'ÿ'. */
4983 /* A name with all sorts of complications. Starts with "z" to make
4984 it easier for the completion tests below. */
4985 #define Z_SYM_NAME \
4986 "z::std::tuple<(anonymous namespace)::ui*, std::bar<(anonymous namespace)::ui> >" \
4987 "::tuple<(anonymous namespace)::ui*, " \
4988 "std::default_delete<(anonymous namespace)::ui>, void>"
4993 /* Returns true if the mapped_index::find_name_component_bounds method
4994 finds EXPECTED_SYMS in INDEX when looking for SEARCH_NAME, in
4998 check_find_bounds_finds (mapped_index &index,
4999 const char *search_name,
5000 gdb::array_view<const char *> expected_syms)
5002 lookup_name_info lookup_name (search_name,
5003 symbol_name_match_type::FULL, true);
5005 auto bounds = index.find_name_components_bounds (lookup_name);
5007 size_t distance = std::distance (bounds.first, bounds.second);
5008 if (distance != expected_syms.size ())
5011 for (size_t exp_elem = 0; exp_elem < distance; exp_elem++)
5013 auto nc_elem = bounds.first + exp_elem;
5014 const char *qualified = index.symbol_name_at (nc_elem->idx);
5015 if (strcmp (qualified, expected_syms[exp_elem]) != 0)
5022 /* Test the lower-level mapped_index::find_name_component_bounds
5026 test_mapped_index_find_name_component_bounds ()
5028 mock_mapped_index mock_index (test_symbols);
5030 mock_index.index ().build_name_components ();
5032 /* Test the lower-level mapped_index::find_name_component_bounds
5033 method in completion mode. */
5035 static const char *expected_syms[] = {
5040 SELF_CHECK (check_find_bounds_finds (mock_index.index (),
5041 "t1_func", expected_syms));
5044 /* Check that the increment-last-char in the name matching algorithm
5045 for completion doesn't get confused with Ansi1 'ÿ' / 0xff. */
5047 static const char *expected_syms1[] = {
5051 SELF_CHECK (check_find_bounds_finds (mock_index.index (),
5052 "\377", expected_syms1));
5054 static const char *expected_syms2[] = {
5057 SELF_CHECK (check_find_bounds_finds (mock_index.index (),
5058 "\377\377", expected_syms2));
5062 /* Test dw2_expand_symtabs_matching_symbol. */
5065 test_dw2_expand_symtabs_matching_symbol ()
5067 mock_mapped_index mock_index (test_symbols);
5069 /* We let all tests run until the end even if some fails, for debug
5071 bool any_mismatch = false;
5073 /* Create the expected symbols list (an initializer_list). Needed
5074 because lists have commas, and we need to pass them to CHECK,
5075 which is a macro. */
5076 #define EXPECT(...) { __VA_ARGS__ }
5078 /* Wrapper for check_match that passes down the current
5079 __FILE__/__LINE__. */
5080 #define CHECK_MATCH(NAME, MATCH_TYPE, COMPLETION_MODE, EXPECTED_LIST) \
5081 any_mismatch |= !check_match (__FILE__, __LINE__, \
5083 NAME, MATCH_TYPE, COMPLETION_MODE, \
5086 /* Identity checks. */
5087 for (const char *sym : test_symbols)
5089 /* Should be able to match all existing symbols. */
5090 CHECK_MATCH (sym, symbol_name_match_type::FULL, false,
5093 /* Should be able to match all existing symbols with
5095 std::string with_params = std::string (sym) + "(int)";
5096 CHECK_MATCH (with_params.c_str (), symbol_name_match_type::FULL, false,
5099 /* Should be able to match all existing symbols with
5100 parameters and qualifiers. */
5101 with_params = std::string (sym) + " ( int ) const";
5102 CHECK_MATCH (with_params.c_str (), symbol_name_match_type::FULL, false,
5105 /* This should really find sym, but cp-name-parser.y doesn't
5106 know about lvalue/rvalue qualifiers yet. */
5107 with_params = std::string (sym) + " ( int ) &&";
5108 CHECK_MATCH (with_params.c_str (), symbol_name_match_type::FULL, false,
5112 /* Check that the name matching algorithm for completion doesn't get
5113 confused with Latin1 'ÿ' / 0xff. */
5115 static const char str[] = "\377";
5116 CHECK_MATCH (str, symbol_name_match_type::FULL, true,
5117 EXPECT ("\377", "\377\377123"));
5120 /* Check that the increment-last-char in the matching algorithm for
5121 completion doesn't match "t1_fund" when completing "t1_func". */
5123 static const char str[] = "t1_func";
5124 CHECK_MATCH (str, symbol_name_match_type::FULL, true,
5125 EXPECT ("t1_func", "t1_func1"));
5128 /* Check that completion mode works at each prefix of the expected
5131 static const char str[] = "function(int)";
5132 size_t len = strlen (str);
5135 for (size_t i = 1; i < len; i++)
5137 lookup.assign (str, i);
5138 CHECK_MATCH (lookup.c_str (), symbol_name_match_type::FULL, true,
5139 EXPECT ("function"));
5143 /* While "w" is a prefix of both components, the match function
5144 should still only be called once. */
5146 CHECK_MATCH ("w", symbol_name_match_type::FULL, true,
5148 CHECK_MATCH ("w", symbol_name_match_type::WILD, true,
5152 /* Same, with a "complicated" symbol. */
5154 static const char str[] = Z_SYM_NAME;
5155 size_t len = strlen (str);
5158 for (size_t i = 1; i < len; i++)
5160 lookup.assign (str, i);
5161 CHECK_MATCH (lookup.c_str (), symbol_name_match_type::FULL, true,
5162 EXPECT (Z_SYM_NAME));
5166 /* In FULL mode, an incomplete symbol doesn't match. */
5168 CHECK_MATCH ("std::zfunction(int", symbol_name_match_type::FULL, false,
5172 /* A complete symbol with parameters matches any overload, since the
5173 index has no overload info. */
5175 CHECK_MATCH ("std::zfunction(int)", symbol_name_match_type::FULL, true,
5176 EXPECT ("std::zfunction", "std::zfunction2"));
5177 CHECK_MATCH ("zfunction(int)", symbol_name_match_type::WILD, true,
5178 EXPECT ("std::zfunction", "std::zfunction2"));
5179 CHECK_MATCH ("zfunc", symbol_name_match_type::WILD, true,
5180 EXPECT ("std::zfunction", "std::zfunction2"));
5183 /* Check that whitespace is ignored appropriately. A symbol with a
5184 template argument list. */
5186 static const char expected[] = "ns::foo<int>";
5187 CHECK_MATCH ("ns :: foo < int > ", symbol_name_match_type::FULL, false,
5189 CHECK_MATCH ("foo < int > ", symbol_name_match_type::WILD, false,
5193 /* Check that whitespace is ignored appropriately. A symbol with a
5194 template argument list that includes a pointer. */
5196 static const char expected[] = "ns::foo<char*>";
5197 /* Try both completion and non-completion modes. */
5198 static const bool completion_mode[2] = {false, true};
5199 for (size_t i = 0; i < 2; i++)
5201 CHECK_MATCH ("ns :: foo < char * >", symbol_name_match_type::FULL,
5202 completion_mode[i], EXPECT (expected));
5203 CHECK_MATCH ("foo < char * >", symbol_name_match_type::WILD,
5204 completion_mode[i], EXPECT (expected));
5206 CHECK_MATCH ("ns :: foo < char * > (int)", symbol_name_match_type::FULL,
5207 completion_mode[i], EXPECT (expected));
5208 CHECK_MATCH ("foo < char * > (int)", symbol_name_match_type::WILD,
5209 completion_mode[i], EXPECT (expected));
5214 /* Check method qualifiers are ignored. */
5215 static const char expected[] = "ns::foo<char*>";
5216 CHECK_MATCH ("ns :: foo < char * > ( int ) const",
5217 symbol_name_match_type::FULL, true, EXPECT (expected));
5218 CHECK_MATCH ("ns :: foo < char * > ( int ) &&",
5219 symbol_name_match_type::FULL, true, EXPECT (expected));
5220 CHECK_MATCH ("foo < char * > ( int ) const",
5221 symbol_name_match_type::WILD, true, EXPECT (expected));
5222 CHECK_MATCH ("foo < char * > ( int ) &&",
5223 symbol_name_match_type::WILD, true, EXPECT (expected));
5226 /* Test lookup names that don't match anything. */
5228 CHECK_MATCH ("bar2", symbol_name_match_type::WILD, false,
5231 CHECK_MATCH ("doesntexist", symbol_name_match_type::FULL, false,
5235 /* Some wild matching tests, exercising "(anonymous namespace)",
5236 which should not be confused with a parameter list. */
5238 static const char *syms[] = {
5242 "A :: B :: C ( int )",
5247 for (const char *s : syms)
5249 CHECK_MATCH (s, symbol_name_match_type::WILD, false,
5250 EXPECT ("(anonymous namespace)::A::B::C"));
5255 static const char expected[] = "ns2::tmpl<int>::foo2";
5256 CHECK_MATCH ("tmp", symbol_name_match_type::WILD, true,
5258 CHECK_MATCH ("tmpl<", symbol_name_match_type::WILD, true,
5262 SELF_CHECK (!any_mismatch);
5271 test_mapped_index_find_name_component_bounds ();
5272 test_dw2_expand_symtabs_matching_symbol ();
5275 }} // namespace selftests::dw2_expand_symtabs_matching
5277 #endif /* GDB_SELF_TEST */
5279 /* If FILE_MATCHER is NULL or if PER_CU has
5280 dwarf2_per_cu_quick_data::MARK set (see
5281 dw_expand_symtabs_matching_file_matcher), expand the CU and call
5282 EXPANSION_NOTIFY on it. */
5285 dw2_expand_symtabs_matching_one
5286 (struct dwarf2_per_cu_data *per_cu,
5287 gdb::function_view<expand_symtabs_file_matcher_ftype> file_matcher,
5288 gdb::function_view<expand_symtabs_exp_notify_ftype> expansion_notify)
5290 if (file_matcher == NULL || per_cu->v.quick->mark)
5292 bool symtab_was_null
5293 = (per_cu->v.quick->compunit_symtab == NULL);
5295 dw2_instantiate_symtab (per_cu);
5297 if (expansion_notify != NULL
5299 && per_cu->v.quick->compunit_symtab != NULL)
5300 expansion_notify (per_cu->v.quick->compunit_symtab);
5304 /* Helper for dw2_expand_matching symtabs. Called on each symbol
5305 matched, to expand corresponding CUs that were marked. IDX is the
5306 index of the symbol name that matched. */
5309 dw2_expand_marked_cus
5310 (mapped_index &index, offset_type idx,
5311 struct objfile *objfile,
5312 gdb::function_view<expand_symtabs_file_matcher_ftype> file_matcher,
5313 gdb::function_view<expand_symtabs_exp_notify_ftype> expansion_notify,
5316 offset_type *vec, vec_len, vec_idx;
5317 bool global_seen = false;
5319 vec = (offset_type *) (index.constant_pool
5320 + MAYBE_SWAP (index.symbol_table[idx].vec));
5321 vec_len = MAYBE_SWAP (vec[0]);
5322 for (vec_idx = 0; vec_idx < vec_len; ++vec_idx)
5324 struct dwarf2_per_cu_data *per_cu;
5325 offset_type cu_index_and_attrs = MAYBE_SWAP (vec[vec_idx + 1]);
5326 /* This value is only valid for index versions >= 7. */
5327 int is_static = GDB_INDEX_SYMBOL_STATIC_VALUE (cu_index_and_attrs);
5328 gdb_index_symbol_kind symbol_kind =
5329 GDB_INDEX_SYMBOL_KIND_VALUE (cu_index_and_attrs);
5330 int cu_index = GDB_INDEX_CU_VALUE (cu_index_and_attrs);
5331 /* Only check the symbol attributes if they're present.
5332 Indices prior to version 7 don't record them,
5333 and indices >= 7 may elide them for certain symbols
5334 (gold does this). */
5337 && symbol_kind != GDB_INDEX_SYMBOL_KIND_NONE);
5339 /* Work around gold/15646. */
5342 if (!is_static && global_seen)
5348 /* Only check the symbol's kind if it has one. */
5353 case VARIABLES_DOMAIN:
5354 if (symbol_kind != GDB_INDEX_SYMBOL_KIND_VARIABLE)
5357 case FUNCTIONS_DOMAIN:
5358 if (symbol_kind != GDB_INDEX_SYMBOL_KIND_FUNCTION)
5362 if (symbol_kind != GDB_INDEX_SYMBOL_KIND_TYPE)
5370 /* Don't crash on bad data. */
5371 if (cu_index >= (dwarf2_per_objfile->n_comp_units
5372 + dwarf2_per_objfile->n_type_units))
5374 complaint (&symfile_complaints,
5375 _(".gdb_index entry has bad CU index"
5376 " [in module %s]"), objfile_name (objfile));
5380 per_cu = dw2_get_cutu (cu_index);
5381 dw2_expand_symtabs_matching_one (per_cu, file_matcher,
5386 /* If FILE_MATCHER is non-NULL, set all the
5387 dwarf2_per_cu_quick_data::MARK of the current DWARF2_PER_OBJFILE
5388 that match FILE_MATCHER. */
5391 dw_expand_symtabs_matching_file_matcher
5392 (gdb::function_view<expand_symtabs_file_matcher_ftype> file_matcher)
5394 if (file_matcher == NULL)
5397 objfile *const objfile = dwarf2_per_objfile->objfile;
5399 htab_up visited_found (htab_create_alloc (10, htab_hash_pointer,
5401 NULL, xcalloc, xfree));
5402 htab_up visited_not_found (htab_create_alloc (10, htab_hash_pointer,
5404 NULL, xcalloc, xfree));
5406 /* The rule is CUs specify all the files, including those used by
5407 any TU, so there's no need to scan TUs here. */
5409 for (int i = 0; i < dwarf2_per_objfile->n_comp_units; ++i)
5412 struct dwarf2_per_cu_data *per_cu = dw2_get_cu (i);
5413 struct quick_file_names *file_data;
5418 per_cu->v.quick->mark = 0;
5420 /* We only need to look at symtabs not already expanded. */
5421 if (per_cu->v.quick->compunit_symtab)
5424 file_data = dw2_get_file_names (per_cu);
5425 if (file_data == NULL)
5428 if (htab_find (visited_not_found.get (), file_data) != NULL)
5430 else if (htab_find (visited_found.get (), file_data) != NULL)
5432 per_cu->v.quick->mark = 1;
5436 for (j = 0; j < file_data->num_file_names; ++j)
5438 const char *this_real_name;
5440 if (file_matcher (file_data->file_names[j], false))
5442 per_cu->v.quick->mark = 1;
5446 /* Before we invoke realpath, which can get expensive when many
5447 files are involved, do a quick comparison of the basenames. */
5448 if (!basenames_may_differ
5449 && !file_matcher (lbasename (file_data->file_names[j]),
5453 this_real_name = dw2_get_real_path (objfile, file_data, j);
5454 if (file_matcher (this_real_name, false))
5456 per_cu->v.quick->mark = 1;
5461 slot = htab_find_slot (per_cu->v.quick->mark
5462 ? visited_found.get ()
5463 : visited_not_found.get (),
5470 dw2_expand_symtabs_matching
5471 (struct objfile *objfile,
5472 gdb::function_view<expand_symtabs_file_matcher_ftype> file_matcher,
5473 const lookup_name_info &lookup_name,
5474 gdb::function_view<expand_symtabs_symbol_matcher_ftype> symbol_matcher,
5475 gdb::function_view<expand_symtabs_exp_notify_ftype> expansion_notify,
5476 enum search_domain kind)
5478 dw2_setup (objfile);
5480 /* index_table is NULL if OBJF_READNOW. */
5481 if (!dwarf2_per_objfile->index_table)
5484 dw_expand_symtabs_matching_file_matcher (file_matcher);
5486 mapped_index &index = *dwarf2_per_objfile->index_table;
5488 dw2_expand_symtabs_matching_symbol (index, lookup_name,
5490 kind, [&] (offset_type idx)
5492 dw2_expand_marked_cus (index, idx, objfile, file_matcher,
5493 expansion_notify, kind);
5497 /* A helper for dw2_find_pc_sect_compunit_symtab which finds the most specific
5500 static struct compunit_symtab *
5501 recursively_find_pc_sect_compunit_symtab (struct compunit_symtab *cust,
5506 if (COMPUNIT_BLOCKVECTOR (cust) != NULL
5507 && blockvector_contains_pc (COMPUNIT_BLOCKVECTOR (cust), pc))
5510 if (cust->includes == NULL)
5513 for (i = 0; cust->includes[i]; ++i)
5515 struct compunit_symtab *s = cust->includes[i];
5517 s = recursively_find_pc_sect_compunit_symtab (s, pc);
5525 static struct compunit_symtab *
5526 dw2_find_pc_sect_compunit_symtab (struct objfile *objfile,
5527 struct bound_minimal_symbol msymbol,
5529 struct obj_section *section,
5532 struct dwarf2_per_cu_data *data;
5533 struct compunit_symtab *result;
5535 dw2_setup (objfile);
5537 if (!objfile->psymtabs_addrmap)
5540 data = (struct dwarf2_per_cu_data *) addrmap_find (objfile->psymtabs_addrmap,
5545 if (warn_if_readin && data->v.quick->compunit_symtab)
5546 warning (_("(Internal error: pc %s in read in CU, but not in symtab.)"),
5547 paddress (get_objfile_arch (objfile), pc));
5550 = recursively_find_pc_sect_compunit_symtab (dw2_instantiate_symtab (data),
5552 gdb_assert (result != NULL);
5557 dw2_map_symbol_filenames (struct objfile *objfile, symbol_filename_ftype *fun,
5558 void *data, int need_fullname)
5560 dw2_setup (objfile);
5562 if (!dwarf2_per_objfile->filenames_cache)
5564 dwarf2_per_objfile->filenames_cache.emplace ();
5566 htab_up visited (htab_create_alloc (10,
5567 htab_hash_pointer, htab_eq_pointer,
5568 NULL, xcalloc, xfree));
5570 /* The rule is CUs specify all the files, including those used
5571 by any TU, so there's no need to scan TUs here. We can
5572 ignore file names coming from already-expanded CUs. */
5574 for (int i = 0; i < dwarf2_per_objfile->n_comp_units; ++i)
5576 struct dwarf2_per_cu_data *per_cu = dw2_get_cutu (i);
5578 if (per_cu->v.quick->compunit_symtab)
5580 void **slot = htab_find_slot (visited.get (),
5581 per_cu->v.quick->file_names,
5584 *slot = per_cu->v.quick->file_names;
5588 for (int i = 0; i < dwarf2_per_objfile->n_comp_units; ++i)
5590 struct dwarf2_per_cu_data *per_cu = dw2_get_cu (i);
5591 struct quick_file_names *file_data;
5594 /* We only need to look at symtabs not already expanded. */
5595 if (per_cu->v.quick->compunit_symtab)
5598 file_data = dw2_get_file_names (per_cu);
5599 if (file_data == NULL)
5602 slot = htab_find_slot (visited.get (), file_data, INSERT);
5605 /* Already visited. */
5610 for (int j = 0; j < file_data->num_file_names; ++j)
5612 const char *filename = file_data->file_names[j];
5613 dwarf2_per_objfile->filenames_cache->seen (filename);
5618 dwarf2_per_objfile->filenames_cache->traverse ([&] (const char *filename)
5620 gdb::unique_xmalloc_ptr<char> this_real_name;
5623 this_real_name = gdb_realpath (filename);
5624 (*fun) (filename, this_real_name.get (), data);
5629 dw2_has_symbols (struct objfile *objfile)
5634 const struct quick_symbol_functions dwarf2_gdb_index_functions =
5637 dw2_find_last_source_symtab,
5638 dw2_forget_cached_source_info,
5639 dw2_map_symtabs_matching_filename,
5644 dw2_expand_symtabs_for_function,
5645 dw2_expand_all_symtabs,
5646 dw2_expand_symtabs_with_fullname,
5647 dw2_map_matching_symbols,
5648 dw2_expand_symtabs_matching,
5649 dw2_find_pc_sect_compunit_symtab,
5651 dw2_map_symbol_filenames
5654 /* DWARF-5 debug_names reader. */
5656 /* DWARF-5 augmentation string for GDB's DW_IDX_GNU_* extension. */
5657 static const gdb_byte dwarf5_augmentation[] = { 'G', 'D', 'B', 0 };
5659 /* A helper function that reads the .debug_names section in SECTION
5660 and fills in MAP. FILENAME is the name of the file containing the
5661 section; it is used for error reporting.
5663 Returns true if all went well, false otherwise. */
5666 read_debug_names_from_section (struct objfile *objfile,
5667 const char *filename,
5668 struct dwarf2_section_info *section,
5669 mapped_debug_names &map)
5671 if (dwarf2_section_empty_p (section))
5674 /* Older elfutils strip versions could keep the section in the main
5675 executable while splitting it for the separate debug info file. */
5676 if ((get_section_flags (section) & SEC_HAS_CONTENTS) == 0)
5679 dwarf2_read_section (objfile, section);
5681 map.dwarf5_byte_order = gdbarch_byte_order (get_objfile_arch (objfile));
5683 const gdb_byte *addr = section->buffer;
5685 bfd *const abfd = get_section_bfd_owner (section);
5687 unsigned int bytes_read;
5688 LONGEST length = read_initial_length (abfd, addr, &bytes_read);
5691 map.dwarf5_is_dwarf64 = bytes_read != 4;
5692 map.offset_size = map.dwarf5_is_dwarf64 ? 8 : 4;
5693 if (bytes_read + length != section->size)
5695 /* There may be multiple per-CU indices. */
5696 warning (_("Section .debug_names in %s length %s does not match "
5697 "section length %s, ignoring .debug_names."),
5698 filename, plongest (bytes_read + length),
5699 pulongest (section->size));
5703 /* The version number. */
5704 uint16_t version = read_2_bytes (abfd, addr);
5708 warning (_("Section .debug_names in %s has unsupported version %d, "
5709 "ignoring .debug_names."),
5715 uint16_t padding = read_2_bytes (abfd, addr);
5719 warning (_("Section .debug_names in %s has unsupported padding %d, "
5720 "ignoring .debug_names."),
5725 /* comp_unit_count - The number of CUs in the CU list. */
5726 map.cu_count = read_4_bytes (abfd, addr);
5729 /* local_type_unit_count - The number of TUs in the local TU
5731 map.tu_count = read_4_bytes (abfd, addr);
5734 /* foreign_type_unit_count - The number of TUs in the foreign TU
5736 uint32_t foreign_tu_count = read_4_bytes (abfd, addr);
5738 if (foreign_tu_count != 0)
5740 warning (_("Section .debug_names in %s has unsupported %lu foreign TUs, "
5741 "ignoring .debug_names."),
5742 filename, static_cast<unsigned long> (foreign_tu_count));
5746 /* bucket_count - The number of hash buckets in the hash lookup
5748 map.bucket_count = read_4_bytes (abfd, addr);
5751 /* name_count - The number of unique names in the index. */
5752 map.name_count = read_4_bytes (abfd, addr);
5755 /* abbrev_table_size - The size in bytes of the abbreviations
5757 uint32_t abbrev_table_size = read_4_bytes (abfd, addr);
5760 /* augmentation_string_size - The size in bytes of the augmentation
5761 string. This value is rounded up to a multiple of 4. */
5762 uint32_t augmentation_string_size = read_4_bytes (abfd, addr);
5764 map.augmentation_is_gdb = ((augmentation_string_size
5765 == sizeof (dwarf5_augmentation))
5766 && memcmp (addr, dwarf5_augmentation,
5767 sizeof (dwarf5_augmentation)) == 0);
5768 augmentation_string_size += (-augmentation_string_size) & 3;
5769 addr += augmentation_string_size;
5772 map.cu_table_reordered = addr;
5773 addr += map.cu_count * map.offset_size;
5775 /* List of Local TUs */
5776 map.tu_table_reordered = addr;
5777 addr += map.tu_count * map.offset_size;
5779 /* Hash Lookup Table */
5780 map.bucket_table_reordered = reinterpret_cast<const uint32_t *> (addr);
5781 addr += map.bucket_count * 4;
5782 map.hash_table_reordered = reinterpret_cast<const uint32_t *> (addr);
5783 addr += map.name_count * 4;
5786 map.name_table_string_offs_reordered = addr;
5787 addr += map.name_count * map.offset_size;
5788 map.name_table_entry_offs_reordered = addr;
5789 addr += map.name_count * map.offset_size;
5791 const gdb_byte *abbrev_table_start = addr;
5794 unsigned int bytes_read;
5795 const ULONGEST index_num = read_unsigned_leb128 (abfd, addr, &bytes_read);
5800 const auto insertpair
5801 = map.abbrev_map.emplace (index_num, mapped_debug_names::index_val ());
5802 if (!insertpair.second)
5804 warning (_("Section .debug_names in %s has duplicate index %s, "
5805 "ignoring .debug_names."),
5806 filename, pulongest (index_num));
5809 mapped_debug_names::index_val &indexval = insertpair.first->second;
5810 indexval.dwarf_tag = read_unsigned_leb128 (abfd, addr, &bytes_read);
5815 mapped_debug_names::index_val::attr attr;
5816 attr.dw_idx = read_unsigned_leb128 (abfd, addr, &bytes_read);
5818 attr.form = read_unsigned_leb128 (abfd, addr, &bytes_read);
5820 if (attr.form == DW_FORM_implicit_const)
5822 attr.implicit_const = read_signed_leb128 (abfd, addr,
5826 if (attr.dw_idx == 0 && attr.form == 0)
5828 indexval.attr_vec.push_back (std::move (attr));
5831 if (addr != abbrev_table_start + abbrev_table_size)
5833 warning (_("Section .debug_names in %s has abbreviation_table "
5834 "of size %zu vs. written as %u, ignoring .debug_names."),
5835 filename, addr - abbrev_table_start, abbrev_table_size);
5838 map.entry_pool = addr;
5843 /* A helper for create_cus_from_debug_names that handles the MAP's CU
5847 create_cus_from_debug_names_list (struct objfile *objfile,
5848 const mapped_debug_names &map,
5849 dwarf2_section_info §ion,
5850 bool is_dwz, int base_offset)
5852 sect_offset sect_off_prev;
5853 for (uint32_t i = 0; i <= map.cu_count; ++i)
5855 sect_offset sect_off_next;
5856 if (i < map.cu_count)
5859 = (sect_offset) (extract_unsigned_integer
5860 (map.cu_table_reordered + i * map.offset_size,
5862 map.dwarf5_byte_order));
5865 sect_off_next = (sect_offset) section.size;
5868 const ULONGEST length = sect_off_next - sect_off_prev;
5869 dwarf2_per_objfile->all_comp_units[base_offset + (i - 1)]
5870 = create_cu_from_index_list (objfile, §ion, is_dwz,
5871 sect_off_prev, length);
5873 sect_off_prev = sect_off_next;
5877 /* Read the CU list from the mapped index, and use it to create all
5878 the CU objects for this objfile. */
5881 create_cus_from_debug_names (struct objfile *objfile,
5882 const mapped_debug_names &map,
5883 const mapped_debug_names &dwz_map)
5886 dwarf2_per_objfile->n_comp_units = map.cu_count + dwz_map.cu_count;
5887 dwarf2_per_objfile->all_comp_units
5888 = XOBNEWVEC (&objfile->objfile_obstack, struct dwarf2_per_cu_data *,
5889 dwarf2_per_objfile->n_comp_units);
5891 create_cus_from_debug_names_list (objfile, map, dwarf2_per_objfile->info,
5893 0 /* base_offset */);
5895 if (dwz_map.cu_count == 0)
5898 dwz_file *dwz = dwarf2_get_dwz_file ();
5899 create_cus_from_debug_names_list (objfile, dwz_map, dwz->info,
5901 map.cu_count /* base_offset */);
5904 /* Read .debug_names. If everything went ok, initialize the "quick"
5905 elements of all the CUs and return true. Otherwise, return false. */
5908 dwarf2_read_debug_names (struct objfile *objfile)
5910 mapped_debug_names local_map, dwz_map;
5912 if (!read_debug_names_from_section (objfile, objfile_name (objfile),
5913 &dwarf2_per_objfile->debug_names,
5917 /* Don't use the index if it's empty. */
5918 if (local_map.name_count == 0)
5921 /* If there is a .dwz file, read it so we can get its CU list as
5923 dwz_file *dwz = dwarf2_get_dwz_file ();
5926 if (!read_debug_names_from_section (objfile,
5927 bfd_get_filename (dwz->dwz_bfd),
5928 &dwz->debug_names, dwz_map))
5930 warning (_("could not read '.debug_names' section from %s; skipping"),
5931 bfd_get_filename (dwz->dwz_bfd));
5936 create_cus_from_debug_names (objfile, local_map, dwz_map);
5938 if (local_map.tu_count != 0)
5940 /* We can only handle a single .debug_types when we have an
5942 if (VEC_length (dwarf2_section_info_def, dwarf2_per_objfile->types) != 1)
5945 dwarf2_section_info *section = VEC_index (dwarf2_section_info_def,
5946 dwarf2_per_objfile->types, 0);
5948 create_signatured_type_table_from_debug_names
5949 (objfile, local_map, section, &dwarf2_per_objfile->abbrev);
5952 create_addrmap_from_aranges (objfile, &dwarf2_per_objfile->debug_aranges);
5954 dwarf2_per_objfile->debug_names_table.reset (new mapped_debug_names);
5955 *dwarf2_per_objfile->debug_names_table = std::move (local_map);
5956 dwarf2_per_objfile->using_index = 1;
5957 dwarf2_per_objfile->quick_file_names_table =
5958 create_quick_file_names_table (dwarf2_per_objfile->n_comp_units);
5963 /* Symbol name hashing function as specified by DWARF-5. */
5966 dwarf5_djb_hash (const char *str_)
5968 const unsigned char *str = (const unsigned char *) str_;
5970 /* Note: tolower here ignores UTF-8, which isn't fully compliant.
5971 See http://dwarfstd.org/ShowIssue.php?issue=161027.1. */
5973 uint32_t hash = 5381;
5974 while (int c = *str++)
5975 hash = hash * 33 + tolower (c);
5979 /* Type used to manage iterating over all CUs looking for a symbol for
5982 class dw2_debug_names_iterator
5985 /* If WANT_SPECIFIC_BLOCK is true, only look for symbols in block
5986 BLOCK_INDEX. Otherwise BLOCK_INDEX is ignored. */
5987 dw2_debug_names_iterator (const mapped_debug_names &map,
5988 bool want_specific_block,
5989 block_enum block_index, domain_enum domain,
5991 : m_map (map), m_want_specific_block (want_specific_block),
5992 m_block_index (block_index), m_domain (domain),
5993 m_addr (find_vec_in_debug_names (map, name))
5996 dw2_debug_names_iterator (const mapped_debug_names &map,
5997 search_domain search, uint32_t namei)
6000 m_addr (find_vec_in_debug_names (map, namei))
6003 /* Return the next matching CU or NULL if there are no more. */
6004 dwarf2_per_cu_data *next ();
6007 static const gdb_byte *find_vec_in_debug_names (const mapped_debug_names &map,
6009 static const gdb_byte *find_vec_in_debug_names (const mapped_debug_names &map,
6012 /* The internalized form of .debug_names. */
6013 const mapped_debug_names &m_map;
6015 /* If true, only look for symbols that match BLOCK_INDEX. */
6016 const bool m_want_specific_block = false;
6018 /* One of GLOBAL_BLOCK or STATIC_BLOCK.
6019 Unused if !WANT_SPECIFIC_BLOCK - FIRST_LOCAL_BLOCK is an invalid
6021 const block_enum m_block_index = FIRST_LOCAL_BLOCK;
6023 /* The kind of symbol we're looking for. */
6024 const domain_enum m_domain = UNDEF_DOMAIN;
6025 const search_domain m_search = ALL_DOMAIN;
6027 /* The list of CUs from the index entry of the symbol, or NULL if
6029 const gdb_byte *m_addr;
6033 mapped_debug_names::namei_to_name (uint32_t namei) const
6035 const ULONGEST namei_string_offs
6036 = extract_unsigned_integer ((name_table_string_offs_reordered
6037 + namei * offset_size),
6040 return read_indirect_string_at_offset
6041 (dwarf2_per_objfile->objfile->obfd, namei_string_offs);
6044 /* Find a slot in .debug_names for the object named NAME. If NAME is
6045 found, return pointer to its pool data. If NAME cannot be found,
6049 dw2_debug_names_iterator::find_vec_in_debug_names
6050 (const mapped_debug_names &map, const char *name)
6052 int (*cmp) (const char *, const char *);
6054 if (current_language->la_language == language_cplus
6055 || current_language->la_language == language_fortran
6056 || current_language->la_language == language_d)
6058 /* NAME is already canonical. Drop any qualifiers as
6059 .debug_names does not contain any. */
6061 if (strchr (name, '(') != NULL)
6063 gdb::unique_xmalloc_ptr<char> without_params
6064 = cp_remove_params (name);
6066 if (without_params != NULL)
6068 name = without_params.get();
6073 cmp = (case_sensitivity == case_sensitive_on ? strcmp : strcasecmp);
6075 const uint32_t full_hash = dwarf5_djb_hash (name);
6077 = extract_unsigned_integer (reinterpret_cast<const gdb_byte *>
6078 (map.bucket_table_reordered
6079 + (full_hash % map.bucket_count)), 4,
6080 map.dwarf5_byte_order);
6084 if (namei >= map.name_count)
6086 complaint (&symfile_complaints,
6087 _("Wrong .debug_names with name index %u but name_count=%u "
6089 namei, map.name_count,
6090 objfile_name (dwarf2_per_objfile->objfile));
6096 const uint32_t namei_full_hash
6097 = extract_unsigned_integer (reinterpret_cast<const gdb_byte *>
6098 (map.hash_table_reordered + namei), 4,
6099 map.dwarf5_byte_order);
6100 if (full_hash % map.bucket_count != namei_full_hash % map.bucket_count)
6103 if (full_hash == namei_full_hash)
6105 const char *const namei_string = map.namei_to_name (namei);
6107 #if 0 /* An expensive sanity check. */
6108 if (namei_full_hash != dwarf5_djb_hash (namei_string))
6110 complaint (&symfile_complaints,
6111 _("Wrong .debug_names hash for string at index %u "
6113 namei, objfile_name (dwarf2_per_objfile->objfile));
6118 if (cmp (namei_string, name) == 0)
6120 const ULONGEST namei_entry_offs
6121 = extract_unsigned_integer ((map.name_table_entry_offs_reordered
6122 + namei * map.offset_size),
6123 map.offset_size, map.dwarf5_byte_order);
6124 return map.entry_pool + namei_entry_offs;
6129 if (namei >= map.name_count)
6135 dw2_debug_names_iterator::find_vec_in_debug_names
6136 (const mapped_debug_names &map, uint32_t namei)
6138 if (namei >= map.name_count)
6140 complaint (&symfile_complaints,
6141 _("Wrong .debug_names with name index %u but name_count=%u "
6143 namei, map.name_count,
6144 objfile_name (dwarf2_per_objfile->objfile));
6148 const ULONGEST namei_entry_offs
6149 = extract_unsigned_integer ((map.name_table_entry_offs_reordered
6150 + namei * map.offset_size),
6151 map.offset_size, map.dwarf5_byte_order);
6152 return map.entry_pool + namei_entry_offs;
6155 /* See dw2_debug_names_iterator. */
6157 dwarf2_per_cu_data *
6158 dw2_debug_names_iterator::next ()
6163 bfd *const abfd = dwarf2_per_objfile->objfile->obfd;
6167 unsigned int bytes_read;
6168 const ULONGEST abbrev = read_unsigned_leb128 (abfd, m_addr, &bytes_read);
6169 m_addr += bytes_read;
6173 const auto indexval_it = m_map.abbrev_map.find (abbrev);
6174 if (indexval_it == m_map.abbrev_map.cend ())
6176 complaint (&symfile_complaints,
6177 _("Wrong .debug_names undefined abbrev code %s "
6179 pulongest (abbrev), objfile_name (dwarf2_per_objfile->objfile));
6182 const mapped_debug_names::index_val &indexval = indexval_it->second;
6183 bool have_is_static = false;
6185 dwarf2_per_cu_data *per_cu = NULL;
6186 for (const mapped_debug_names::index_val::attr &attr : indexval.attr_vec)
6191 case DW_FORM_implicit_const:
6192 ull = attr.implicit_const;
6194 case DW_FORM_flag_present:
6198 ull = read_unsigned_leb128 (abfd, m_addr, &bytes_read);
6199 m_addr += bytes_read;
6202 complaint (&symfile_complaints,
6203 _("Unsupported .debug_names form %s [in module %s]"),
6204 dwarf_form_name (attr.form),
6205 objfile_name (dwarf2_per_objfile->objfile));
6208 switch (attr.dw_idx)
6210 case DW_IDX_compile_unit:
6211 /* Don't crash on bad data. */
6212 if (ull >= (dwarf2_per_objfile->n_comp_units
6213 + dwarf2_per_objfile->n_type_units))
6215 complaint (&symfile_complaints,
6216 _(".debug_names entry has bad CU index %s"
6219 objfile_name (dwarf2_per_objfile->objfile));
6222 per_cu = dw2_get_cutu (ull);
6224 case DW_IDX_GNU_internal:
6225 if (!m_map.augmentation_is_gdb)
6227 have_is_static = true;
6230 case DW_IDX_GNU_external:
6231 if (!m_map.augmentation_is_gdb)
6233 have_is_static = true;
6239 /* Skip if already read in. */
6240 if (per_cu->v.quick->compunit_symtab)
6243 /* Check static vs global. */
6246 const bool want_static = m_block_index != GLOBAL_BLOCK;
6247 if (m_want_specific_block && want_static != is_static)
6251 /* Match dw2_symtab_iter_next, symbol_kind
6252 and debug_names::psymbol_tag. */
6256 switch (indexval.dwarf_tag)
6258 case DW_TAG_variable:
6259 case DW_TAG_subprogram:
6260 /* Some types are also in VAR_DOMAIN. */
6261 case DW_TAG_typedef:
6262 case DW_TAG_structure_type:
6269 switch (indexval.dwarf_tag)
6271 case DW_TAG_typedef:
6272 case DW_TAG_structure_type:
6279 switch (indexval.dwarf_tag)
6282 case DW_TAG_variable:
6292 /* Match dw2_expand_symtabs_matching, symbol_kind and
6293 debug_names::psymbol_tag. */
6296 case VARIABLES_DOMAIN:
6297 switch (indexval.dwarf_tag)
6299 case DW_TAG_variable:
6305 case FUNCTIONS_DOMAIN:
6306 switch (indexval.dwarf_tag)
6308 case DW_TAG_subprogram:
6315 switch (indexval.dwarf_tag)
6317 case DW_TAG_typedef:
6318 case DW_TAG_structure_type:
6331 static struct compunit_symtab *
6332 dw2_debug_names_lookup_symbol (struct objfile *objfile, int block_index_int,
6333 const char *name, domain_enum domain)
6335 const block_enum block_index = static_cast<block_enum> (block_index_int);
6336 dw2_setup (objfile);
6338 const auto &mapp = dwarf2_per_objfile->debug_names_table;
6341 /* index is NULL if OBJF_READNOW. */
6344 const auto &map = *mapp;
6346 dw2_debug_names_iterator iter (map, true /* want_specific_block */,
6347 block_index, domain, name);
6349 struct compunit_symtab *stab_best = NULL;
6350 struct dwarf2_per_cu_data *per_cu;
6351 while ((per_cu = iter.next ()) != NULL)
6353 struct symbol *sym, *with_opaque = NULL;
6354 struct compunit_symtab *stab = dw2_instantiate_symtab (per_cu);
6355 const struct blockvector *bv = COMPUNIT_BLOCKVECTOR (stab);
6356 struct block *block = BLOCKVECTOR_BLOCK (bv, block_index);
6358 sym = block_find_symbol (block, name, domain,
6359 block_find_non_opaque_type_preferred,
6362 /* Some caution must be observed with overloaded functions and
6363 methods, since the index will not contain any overload
6364 information (but NAME might contain it). */
6367 && strcmp_iw (SYMBOL_SEARCH_NAME (sym), name) == 0)
6369 if (with_opaque != NULL
6370 && strcmp_iw (SYMBOL_SEARCH_NAME (with_opaque), name) == 0)
6373 /* Keep looking through other CUs. */
6379 /* This dumps minimal information about .debug_names. It is called
6380 via "mt print objfiles". The gdb.dwarf2/gdb-index.exp testcase
6381 uses this to verify that .debug_names has been loaded. */
6384 dw2_debug_names_dump (struct objfile *objfile)
6386 dw2_setup (objfile);
6387 gdb_assert (dwarf2_per_objfile->using_index);
6388 printf_filtered (".debug_names:");
6389 if (dwarf2_per_objfile->debug_names_table)
6390 printf_filtered (" exists\n");
6392 printf_filtered (" faked for \"readnow\"\n");
6393 printf_filtered ("\n");
6397 dw2_debug_names_expand_symtabs_for_function (struct objfile *objfile,
6398 const char *func_name)
6400 dw2_setup (objfile);
6402 /* dwarf2_per_objfile->debug_names_table is NULL if OBJF_READNOW. */
6403 if (dwarf2_per_objfile->debug_names_table)
6405 const mapped_debug_names &map = *dwarf2_per_objfile->debug_names_table;
6407 /* Note: It doesn't matter what we pass for block_index here. */
6408 dw2_debug_names_iterator iter (map, false /* want_specific_block */,
6409 GLOBAL_BLOCK, VAR_DOMAIN, func_name);
6411 struct dwarf2_per_cu_data *per_cu;
6412 while ((per_cu = iter.next ()) != NULL)
6413 dw2_instantiate_symtab (per_cu);
6418 dw2_debug_names_expand_symtabs_matching
6419 (struct objfile *objfile,
6420 gdb::function_view<expand_symtabs_file_matcher_ftype> file_matcher,
6421 const lookup_name_info &lookup_name,
6422 gdb::function_view<expand_symtabs_symbol_matcher_ftype> symbol_matcher,
6423 gdb::function_view<expand_symtabs_exp_notify_ftype> expansion_notify,
6424 enum search_domain kind)
6426 dw2_setup (objfile);
6428 /* debug_names_table is NULL if OBJF_READNOW. */
6429 if (!dwarf2_per_objfile->debug_names_table)
6432 dw_expand_symtabs_matching_file_matcher (file_matcher);
6434 mapped_debug_names &map = *dwarf2_per_objfile->debug_names_table;
6436 dw2_expand_symtabs_matching_symbol (map, lookup_name,
6438 kind, [&] (offset_type namei)
6440 /* The name was matched, now expand corresponding CUs that were
6442 dw2_debug_names_iterator iter (map, kind, namei);
6444 struct dwarf2_per_cu_data *per_cu;
6445 while ((per_cu = iter.next ()) != NULL)
6446 dw2_expand_symtabs_matching_one (per_cu, file_matcher,
6451 const struct quick_symbol_functions dwarf2_debug_names_functions =
6454 dw2_find_last_source_symtab,
6455 dw2_forget_cached_source_info,
6456 dw2_map_symtabs_matching_filename,
6457 dw2_debug_names_lookup_symbol,
6459 dw2_debug_names_dump,
6461 dw2_debug_names_expand_symtabs_for_function,
6462 dw2_expand_all_symtabs,
6463 dw2_expand_symtabs_with_fullname,
6464 dw2_map_matching_symbols,
6465 dw2_debug_names_expand_symtabs_matching,
6466 dw2_find_pc_sect_compunit_symtab,
6468 dw2_map_symbol_filenames
6471 /* Initialize for reading DWARF for this objfile. Return 0 if this
6472 file will use psymtabs, or 1 if using the GNU index. */
6475 dwarf2_initialize_objfile (struct objfile *objfile)
6477 /* If we're about to read full symbols, don't bother with the
6478 indices. In this case we also don't care if some other debug
6479 format is making psymtabs, because they are all about to be
6481 if ((objfile->flags & OBJF_READNOW))
6485 dwarf2_per_objfile->using_index = 1;
6486 create_all_comp_units (objfile);
6487 create_all_type_units (objfile);
6488 dwarf2_per_objfile->quick_file_names_table =
6489 create_quick_file_names_table (dwarf2_per_objfile->n_comp_units);
6491 for (i = 0; i < (dwarf2_per_objfile->n_comp_units
6492 + dwarf2_per_objfile->n_type_units); ++i)
6494 struct dwarf2_per_cu_data *per_cu = dw2_get_cutu (i);
6496 per_cu->v.quick = OBSTACK_ZALLOC (&objfile->objfile_obstack,
6497 struct dwarf2_per_cu_quick_data);
6500 /* Return 1 so that gdb sees the "quick" functions. However,
6501 these functions will be no-ops because we will have expanded
6503 return elf_sym_fns_gdb_index;
6506 if (dwarf2_read_debug_names (objfile))
6507 return elf_sym_fns_debug_names;
6509 if (dwarf2_read_index (objfile))
6510 return elf_sym_fns_gdb_index;
6512 return elf_sym_fns_lazy_psyms;
6517 /* Build a partial symbol table. */
6520 dwarf2_build_psymtabs (struct objfile *objfile)
6523 if (objfile->global_psymbols.capacity () == 0
6524 && objfile->static_psymbols.capacity () == 0)
6525 init_psymbol_list (objfile, 1024);
6529 /* This isn't really ideal: all the data we allocate on the
6530 objfile's obstack is still uselessly kept around. However,
6531 freeing it seems unsafe. */
6532 psymtab_discarder psymtabs (objfile);
6533 dwarf2_build_psymtabs_hard (objfile);
6536 CATCH (except, RETURN_MASK_ERROR)
6538 exception_print (gdb_stderr, except);
6543 /* Return the total length of the CU described by HEADER. */
6546 get_cu_length (const struct comp_unit_head *header)
6548 return header->initial_length_size + header->length;
6551 /* Return TRUE if SECT_OFF is within CU_HEADER. */
6554 offset_in_cu_p (const comp_unit_head *cu_header, sect_offset sect_off)
6556 sect_offset bottom = cu_header->sect_off;
6557 sect_offset top = cu_header->sect_off + get_cu_length (cu_header);
6559 return sect_off >= bottom && sect_off < top;
6562 /* Find the base address of the compilation unit for range lists and
6563 location lists. It will normally be specified by DW_AT_low_pc.
6564 In DWARF-3 draft 4, the base address could be overridden by
6565 DW_AT_entry_pc. It's been removed, but GCC still uses this for
6566 compilation units with discontinuous ranges. */
6569 dwarf2_find_base_address (struct die_info *die, struct dwarf2_cu *cu)
6571 struct attribute *attr;
6574 cu->base_address = 0;
6576 attr = dwarf2_attr (die, DW_AT_entry_pc, cu);
6579 cu->base_address = attr_value_as_address (attr);
6584 attr = dwarf2_attr (die, DW_AT_low_pc, cu);
6587 cu->base_address = attr_value_as_address (attr);
6593 /* Read in the comp unit header information from the debug_info at info_ptr.
6594 Use rcuh_kind::COMPILE as the default type if not known by the caller.
6595 NOTE: This leaves members offset, first_die_offset to be filled in
6598 static const gdb_byte *
6599 read_comp_unit_head (struct comp_unit_head *cu_header,
6600 const gdb_byte *info_ptr,
6601 struct dwarf2_section_info *section,
6602 rcuh_kind section_kind)
6605 unsigned int bytes_read;
6606 const char *filename = get_section_file_name (section);
6607 bfd *abfd = get_section_bfd_owner (section);
6609 cu_header->length = read_initial_length (abfd, info_ptr, &bytes_read);
6610 cu_header->initial_length_size = bytes_read;
6611 cu_header->offset_size = (bytes_read == 4) ? 4 : 8;
6612 info_ptr += bytes_read;
6613 cu_header->version = read_2_bytes (abfd, info_ptr);
6615 if (cu_header->version < 5)
6616 switch (section_kind)
6618 case rcuh_kind::COMPILE:
6619 cu_header->unit_type = DW_UT_compile;
6621 case rcuh_kind::TYPE:
6622 cu_header->unit_type = DW_UT_type;
6625 internal_error (__FILE__, __LINE__,
6626 _("read_comp_unit_head: invalid section_kind"));
6630 cu_header->unit_type = static_cast<enum dwarf_unit_type>
6631 (read_1_byte (abfd, info_ptr));
6633 switch (cu_header->unit_type)
6636 if (section_kind != rcuh_kind::COMPILE)
6637 error (_("Dwarf Error: wrong unit_type in compilation unit header "
6638 "(is DW_UT_compile, should be DW_UT_type) [in module %s]"),
6642 section_kind = rcuh_kind::TYPE;
6645 error (_("Dwarf Error: wrong unit_type in compilation unit header "
6646 "(is %d, should be %d or %d) [in module %s]"),
6647 cu_header->unit_type, DW_UT_compile, DW_UT_type, filename);
6650 cu_header->addr_size = read_1_byte (abfd, info_ptr);
6653 cu_header->abbrev_sect_off = (sect_offset) read_offset (abfd, info_ptr,
6656 info_ptr += bytes_read;
6657 if (cu_header->version < 5)
6659 cu_header->addr_size = read_1_byte (abfd, info_ptr);
6662 signed_addr = bfd_get_sign_extend_vma (abfd);
6663 if (signed_addr < 0)
6664 internal_error (__FILE__, __LINE__,
6665 _("read_comp_unit_head: dwarf from non elf file"));
6666 cu_header->signed_addr_p = signed_addr;
6668 if (section_kind == rcuh_kind::TYPE)
6670 LONGEST type_offset;
6672 cu_header->signature = read_8_bytes (abfd, info_ptr);
6675 type_offset = read_offset (abfd, info_ptr, cu_header, &bytes_read);
6676 info_ptr += bytes_read;
6677 cu_header->type_cu_offset_in_tu = (cu_offset) type_offset;
6678 if (to_underlying (cu_header->type_cu_offset_in_tu) != type_offset)
6679 error (_("Dwarf Error: Too big type_offset in compilation unit "
6680 "header (is %s) [in module %s]"), plongest (type_offset),
6687 /* Helper function that returns the proper abbrev section for
6690 static struct dwarf2_section_info *
6691 get_abbrev_section_for_cu (struct dwarf2_per_cu_data *this_cu)
6693 struct dwarf2_section_info *abbrev;
6695 if (this_cu->is_dwz)
6696 abbrev = &dwarf2_get_dwz_file ()->abbrev;
6698 abbrev = &dwarf2_per_objfile->abbrev;
6703 /* Subroutine of read_and_check_comp_unit_head and
6704 read_and_check_type_unit_head to simplify them.
6705 Perform various error checking on the header. */
6708 error_check_comp_unit_head (struct comp_unit_head *header,
6709 struct dwarf2_section_info *section,
6710 struct dwarf2_section_info *abbrev_section)
6712 const char *filename = get_section_file_name (section);
6714 if (header->version < 2 || header->version > 5)
6715 error (_("Dwarf Error: wrong version in compilation unit header "
6716 "(is %d, should be 2, 3, 4 or 5) [in module %s]"), header->version,
6719 if (to_underlying (header->abbrev_sect_off)
6720 >= dwarf2_section_size (dwarf2_per_objfile->objfile, abbrev_section))
6721 error (_("Dwarf Error: bad offset (0x%x) in compilation unit header "
6722 "(offset 0x%x + 6) [in module %s]"),
6723 to_underlying (header->abbrev_sect_off),
6724 to_underlying (header->sect_off),
6727 /* Cast to ULONGEST to use 64-bit arithmetic when possible to
6728 avoid potential 32-bit overflow. */
6729 if (((ULONGEST) header->sect_off + get_cu_length (header))
6731 error (_("Dwarf Error: bad length (0x%x) in compilation unit header "
6732 "(offset 0x%x + 0) [in module %s]"),
6733 header->length, to_underlying (header->sect_off),
6737 /* Read in a CU/TU header and perform some basic error checking.
6738 The contents of the header are stored in HEADER.
6739 The result is a pointer to the start of the first DIE. */
6741 static const gdb_byte *
6742 read_and_check_comp_unit_head (struct comp_unit_head *header,
6743 struct dwarf2_section_info *section,
6744 struct dwarf2_section_info *abbrev_section,
6745 const gdb_byte *info_ptr,
6746 rcuh_kind section_kind)
6748 const gdb_byte *beg_of_comp_unit = info_ptr;
6750 header->sect_off = (sect_offset) (beg_of_comp_unit - section->buffer);
6752 info_ptr = read_comp_unit_head (header, info_ptr, section, section_kind);
6754 header->first_die_cu_offset = (cu_offset) (info_ptr - beg_of_comp_unit);
6756 error_check_comp_unit_head (header, section, abbrev_section);
6761 /* Fetch the abbreviation table offset from a comp or type unit header. */
6764 read_abbrev_offset (struct dwarf2_section_info *section,
6765 sect_offset sect_off)
6767 bfd *abfd = get_section_bfd_owner (section);
6768 const gdb_byte *info_ptr;
6769 unsigned int initial_length_size, offset_size;
6772 dwarf2_read_section (dwarf2_per_objfile->objfile, section);
6773 info_ptr = section->buffer + to_underlying (sect_off);
6774 read_initial_length (abfd, info_ptr, &initial_length_size);
6775 offset_size = initial_length_size == 4 ? 4 : 8;
6776 info_ptr += initial_length_size;
6778 version = read_2_bytes (abfd, info_ptr);
6782 /* Skip unit type and address size. */
6786 return (sect_offset) read_offset_1 (abfd, info_ptr, offset_size);
6789 /* Allocate a new partial symtab for file named NAME and mark this new
6790 partial symtab as being an include of PST. */
6793 dwarf2_create_include_psymtab (const char *name, struct partial_symtab *pst,
6794 struct objfile *objfile)
6796 struct partial_symtab *subpst = allocate_psymtab (name, objfile);
6798 if (!IS_ABSOLUTE_PATH (subpst->filename))
6800 /* It shares objfile->objfile_obstack. */
6801 subpst->dirname = pst->dirname;
6804 subpst->textlow = 0;
6805 subpst->texthigh = 0;
6807 subpst->dependencies
6808 = XOBNEW (&objfile->objfile_obstack, struct partial_symtab *);
6809 subpst->dependencies[0] = pst;
6810 subpst->number_of_dependencies = 1;
6812 subpst->globals_offset = 0;
6813 subpst->n_global_syms = 0;
6814 subpst->statics_offset = 0;
6815 subpst->n_static_syms = 0;
6816 subpst->compunit_symtab = NULL;
6817 subpst->read_symtab = pst->read_symtab;
6820 /* No private part is necessary for include psymtabs. This property
6821 can be used to differentiate between such include psymtabs and
6822 the regular ones. */
6823 subpst->read_symtab_private = NULL;
6826 /* Read the Line Number Program data and extract the list of files
6827 included by the source file represented by PST. Build an include
6828 partial symtab for each of these included files. */
6831 dwarf2_build_include_psymtabs (struct dwarf2_cu *cu,
6832 struct die_info *die,
6833 struct partial_symtab *pst)
6836 struct attribute *attr;
6838 attr = dwarf2_attr (die, DW_AT_stmt_list, cu);
6840 lh = dwarf_decode_line_header ((sect_offset) DW_UNSND (attr), cu);
6842 return; /* No linetable, so no includes. */
6844 /* NOTE: pst->dirname is DW_AT_comp_dir (if present). */
6845 dwarf_decode_lines (lh.get (), pst->dirname, cu, pst, pst->textlow, 1);
6849 hash_signatured_type (const void *item)
6851 const struct signatured_type *sig_type
6852 = (const struct signatured_type *) item;
6854 /* This drops the top 32 bits of the signature, but is ok for a hash. */
6855 return sig_type->signature;
6859 eq_signatured_type (const void *item_lhs, const void *item_rhs)
6861 const struct signatured_type *lhs = (const struct signatured_type *) item_lhs;
6862 const struct signatured_type *rhs = (const struct signatured_type *) item_rhs;
6864 return lhs->signature == rhs->signature;
6867 /* Allocate a hash table for signatured types. */
6870 allocate_signatured_type_table (struct objfile *objfile)
6872 return htab_create_alloc_ex (41,
6873 hash_signatured_type,
6876 &objfile->objfile_obstack,
6877 hashtab_obstack_allocate,
6878 dummy_obstack_deallocate);
6881 /* A helper function to add a signatured type CU to a table. */
6884 add_signatured_type_cu_to_table (void **slot, void *datum)
6886 struct signatured_type *sigt = (struct signatured_type *) *slot;
6887 struct signatured_type ***datap = (struct signatured_type ***) datum;
6895 /* A helper for create_debug_types_hash_table. Read types from SECTION
6896 and fill them into TYPES_HTAB. It will process only type units,
6897 therefore DW_UT_type. */
6900 create_debug_type_hash_table (struct dwo_file *dwo_file,
6901 dwarf2_section_info *section, htab_t &types_htab,
6902 rcuh_kind section_kind)
6904 struct objfile *objfile = dwarf2_per_objfile->objfile;
6905 struct dwarf2_section_info *abbrev_section;
6907 const gdb_byte *info_ptr, *end_ptr;
6909 abbrev_section = (dwo_file != NULL
6910 ? &dwo_file->sections.abbrev
6911 : &dwarf2_per_objfile->abbrev);
6913 if (dwarf_read_debug)
6914 fprintf_unfiltered (gdb_stdlog, "Reading %s for %s:\n",
6915 get_section_name (section),
6916 get_section_file_name (abbrev_section));
6918 dwarf2_read_section (objfile, section);
6919 info_ptr = section->buffer;
6921 if (info_ptr == NULL)
6924 /* We can't set abfd until now because the section may be empty or
6925 not present, in which case the bfd is unknown. */
6926 abfd = get_section_bfd_owner (section);
6928 /* We don't use init_cutu_and_read_dies_simple, or some such, here
6929 because we don't need to read any dies: the signature is in the
6932 end_ptr = info_ptr + section->size;
6933 while (info_ptr < end_ptr)
6935 struct signatured_type *sig_type;
6936 struct dwo_unit *dwo_tu;
6938 const gdb_byte *ptr = info_ptr;
6939 struct comp_unit_head header;
6940 unsigned int length;
6942 sect_offset sect_off = (sect_offset) (ptr - section->buffer);
6944 /* Initialize it due to a false compiler warning. */
6945 header.signature = -1;
6946 header.type_cu_offset_in_tu = (cu_offset) -1;
6948 /* We need to read the type's signature in order to build the hash
6949 table, but we don't need anything else just yet. */
6951 ptr = read_and_check_comp_unit_head (&header, section,
6952 abbrev_section, ptr, section_kind);
6954 length = get_cu_length (&header);
6956 /* Skip dummy type units. */
6957 if (ptr >= info_ptr + length
6958 || peek_abbrev_code (abfd, ptr) == 0
6959 || header.unit_type != DW_UT_type)
6965 if (types_htab == NULL)
6968 types_htab = allocate_dwo_unit_table (objfile);
6970 types_htab = allocate_signatured_type_table (objfile);
6976 dwo_tu = OBSTACK_ZALLOC (&objfile->objfile_obstack,
6978 dwo_tu->dwo_file = dwo_file;
6979 dwo_tu->signature = header.signature;
6980 dwo_tu->type_offset_in_tu = header.type_cu_offset_in_tu;
6981 dwo_tu->section = section;
6982 dwo_tu->sect_off = sect_off;
6983 dwo_tu->length = length;
6987 /* N.B.: type_offset is not usable if this type uses a DWO file.
6988 The real type_offset is in the DWO file. */
6990 sig_type = OBSTACK_ZALLOC (&objfile->objfile_obstack,
6991 struct signatured_type);
6992 sig_type->signature = header.signature;
6993 sig_type->type_offset_in_tu = header.type_cu_offset_in_tu;
6994 sig_type->per_cu.objfile = objfile;
6995 sig_type->per_cu.is_debug_types = 1;
6996 sig_type->per_cu.section = section;
6997 sig_type->per_cu.sect_off = sect_off;
6998 sig_type->per_cu.length = length;
7001 slot = htab_find_slot (types_htab,
7002 dwo_file ? (void*) dwo_tu : (void *) sig_type,
7004 gdb_assert (slot != NULL);
7007 sect_offset dup_sect_off;
7011 const struct dwo_unit *dup_tu
7012 = (const struct dwo_unit *) *slot;
7014 dup_sect_off = dup_tu->sect_off;
7018 const struct signatured_type *dup_tu
7019 = (const struct signatured_type *) *slot;
7021 dup_sect_off = dup_tu->per_cu.sect_off;
7024 complaint (&symfile_complaints,
7025 _("debug type entry at offset 0x%x is duplicate to"
7026 " the entry at offset 0x%x, signature %s"),
7027 to_underlying (sect_off), to_underlying (dup_sect_off),
7028 hex_string (header.signature));
7030 *slot = dwo_file ? (void *) dwo_tu : (void *) sig_type;
7032 if (dwarf_read_debug > 1)
7033 fprintf_unfiltered (gdb_stdlog, " offset 0x%x, signature %s\n",
7034 to_underlying (sect_off),
7035 hex_string (header.signature));
7041 /* Create the hash table of all entries in the .debug_types
7042 (or .debug_types.dwo) section(s).
7043 If reading a DWO file, then DWO_FILE is a pointer to the DWO file object,
7044 otherwise it is NULL.
7046 The result is a pointer to the hash table or NULL if there are no types.
7048 Note: This function processes DWO files only, not DWP files. */
7051 create_debug_types_hash_table (struct dwo_file *dwo_file,
7052 VEC (dwarf2_section_info_def) *types,
7056 struct dwarf2_section_info *section;
7058 if (VEC_empty (dwarf2_section_info_def, types))
7062 VEC_iterate (dwarf2_section_info_def, types, ix, section);
7064 create_debug_type_hash_table (dwo_file, section, types_htab,
7068 /* Create the hash table of all entries in the .debug_types section,
7069 and initialize all_type_units.
7070 The result is zero if there is an error (e.g. missing .debug_types section),
7071 otherwise non-zero. */
7074 create_all_type_units (struct objfile *objfile)
7076 htab_t types_htab = NULL;
7077 struct signatured_type **iter;
7079 create_debug_type_hash_table (NULL, &dwarf2_per_objfile->info, types_htab,
7080 rcuh_kind::COMPILE);
7081 create_debug_types_hash_table (NULL, dwarf2_per_objfile->types, types_htab);
7082 if (types_htab == NULL)
7084 dwarf2_per_objfile->signatured_types = NULL;
7088 dwarf2_per_objfile->signatured_types = types_htab;
7090 dwarf2_per_objfile->n_type_units
7091 = dwarf2_per_objfile->n_allocated_type_units
7092 = htab_elements (types_htab);
7093 dwarf2_per_objfile->all_type_units =
7094 XNEWVEC (struct signatured_type *, dwarf2_per_objfile->n_type_units);
7095 iter = &dwarf2_per_objfile->all_type_units[0];
7096 htab_traverse_noresize (types_htab, add_signatured_type_cu_to_table, &iter);
7097 gdb_assert (iter - &dwarf2_per_objfile->all_type_units[0]
7098 == dwarf2_per_objfile->n_type_units);
7103 /* Add an entry for signature SIG to dwarf2_per_objfile->signatured_types.
7104 If SLOT is non-NULL, it is the entry to use in the hash table.
7105 Otherwise we find one. */
7107 static struct signatured_type *
7108 add_type_unit (ULONGEST sig, void **slot)
7110 struct objfile *objfile = dwarf2_per_objfile->objfile;
7111 int n_type_units = dwarf2_per_objfile->n_type_units;
7112 struct signatured_type *sig_type;
7114 gdb_assert (n_type_units <= dwarf2_per_objfile->n_allocated_type_units);
7116 if (n_type_units > dwarf2_per_objfile->n_allocated_type_units)
7118 if (dwarf2_per_objfile->n_allocated_type_units == 0)
7119 dwarf2_per_objfile->n_allocated_type_units = 1;
7120 dwarf2_per_objfile->n_allocated_type_units *= 2;
7121 dwarf2_per_objfile->all_type_units
7122 = XRESIZEVEC (struct signatured_type *,
7123 dwarf2_per_objfile->all_type_units,
7124 dwarf2_per_objfile->n_allocated_type_units);
7125 ++dwarf2_per_objfile->tu_stats.nr_all_type_units_reallocs;
7127 dwarf2_per_objfile->n_type_units = n_type_units;
7129 sig_type = OBSTACK_ZALLOC (&objfile->objfile_obstack,
7130 struct signatured_type);
7131 dwarf2_per_objfile->all_type_units[n_type_units - 1] = sig_type;
7132 sig_type->signature = sig;
7133 sig_type->per_cu.is_debug_types = 1;
7134 if (dwarf2_per_objfile->using_index)
7136 sig_type->per_cu.v.quick =
7137 OBSTACK_ZALLOC (&objfile->objfile_obstack,
7138 struct dwarf2_per_cu_quick_data);
7143 slot = htab_find_slot (dwarf2_per_objfile->signatured_types,
7146 gdb_assert (*slot == NULL);
7148 /* The rest of sig_type must be filled in by the caller. */
7152 /* Subroutine of lookup_dwo_signatured_type and lookup_dwp_signatured_type.
7153 Fill in SIG_ENTRY with DWO_ENTRY. */
7156 fill_in_sig_entry_from_dwo_entry (struct objfile *objfile,
7157 struct signatured_type *sig_entry,
7158 struct dwo_unit *dwo_entry)
7160 /* Make sure we're not clobbering something we don't expect to. */
7161 gdb_assert (! sig_entry->per_cu.queued);
7162 gdb_assert (sig_entry->per_cu.cu == NULL);
7163 if (dwarf2_per_objfile->using_index)
7165 gdb_assert (sig_entry->per_cu.v.quick != NULL);
7166 gdb_assert (sig_entry->per_cu.v.quick->compunit_symtab == NULL);
7169 gdb_assert (sig_entry->per_cu.v.psymtab == NULL);
7170 gdb_assert (sig_entry->signature == dwo_entry->signature);
7171 gdb_assert (to_underlying (sig_entry->type_offset_in_section) == 0);
7172 gdb_assert (sig_entry->type_unit_group == NULL);
7173 gdb_assert (sig_entry->dwo_unit == NULL);
7175 sig_entry->per_cu.section = dwo_entry->section;
7176 sig_entry->per_cu.sect_off = dwo_entry->sect_off;
7177 sig_entry->per_cu.length = dwo_entry->length;
7178 sig_entry->per_cu.reading_dwo_directly = 1;
7179 sig_entry->per_cu.objfile = objfile;
7180 sig_entry->type_offset_in_tu = dwo_entry->type_offset_in_tu;
7181 sig_entry->dwo_unit = dwo_entry;
7184 /* Subroutine of lookup_signatured_type.
7185 If we haven't read the TU yet, create the signatured_type data structure
7186 for a TU to be read in directly from a DWO file, bypassing the stub.
7187 This is the "Stay in DWO Optimization": When there is no DWP file and we're
7188 using .gdb_index, then when reading a CU we want to stay in the DWO file
7189 containing that CU. Otherwise we could end up reading several other DWO
7190 files (due to comdat folding) to process the transitive closure of all the
7191 mentioned TUs, and that can be slow. The current DWO file will have every
7192 type signature that it needs.
7193 We only do this for .gdb_index because in the psymtab case we already have
7194 to read all the DWOs to build the type unit groups. */
7196 static struct signatured_type *
7197 lookup_dwo_signatured_type (struct dwarf2_cu *cu, ULONGEST sig)
7199 struct objfile *objfile = dwarf2_per_objfile->objfile;
7200 struct dwo_file *dwo_file;
7201 struct dwo_unit find_dwo_entry, *dwo_entry;
7202 struct signatured_type find_sig_entry, *sig_entry;
7205 gdb_assert (cu->dwo_unit && dwarf2_per_objfile->using_index);
7207 /* If TU skeletons have been removed then we may not have read in any
7209 if (dwarf2_per_objfile->signatured_types == NULL)
7211 dwarf2_per_objfile->signatured_types
7212 = allocate_signatured_type_table (objfile);
7215 /* We only ever need to read in one copy of a signatured type.
7216 Use the global signatured_types array to do our own comdat-folding
7217 of types. If this is the first time we're reading this TU, and
7218 the TU has an entry in .gdb_index, replace the recorded data from
7219 .gdb_index with this TU. */
7221 find_sig_entry.signature = sig;
7222 slot = htab_find_slot (dwarf2_per_objfile->signatured_types,
7223 &find_sig_entry, INSERT);
7224 sig_entry = (struct signatured_type *) *slot;
7226 /* We can get here with the TU already read, *or* in the process of being
7227 read. Don't reassign the global entry to point to this DWO if that's
7228 the case. Also note that if the TU is already being read, it may not
7229 have come from a DWO, the program may be a mix of Fission-compiled
7230 code and non-Fission-compiled code. */
7232 /* Have we already tried to read this TU?
7233 Note: sig_entry can be NULL if the skeleton TU was removed (thus it
7234 needn't exist in the global table yet). */
7235 if (sig_entry != NULL && sig_entry->per_cu.tu_read)
7238 /* Note: cu->dwo_unit is the dwo_unit that references this TU, not the
7239 dwo_unit of the TU itself. */
7240 dwo_file = cu->dwo_unit->dwo_file;
7242 /* Ok, this is the first time we're reading this TU. */
7243 if (dwo_file->tus == NULL)
7245 find_dwo_entry.signature = sig;
7246 dwo_entry = (struct dwo_unit *) htab_find (dwo_file->tus, &find_dwo_entry);
7247 if (dwo_entry == NULL)
7250 /* If the global table doesn't have an entry for this TU, add one. */
7251 if (sig_entry == NULL)
7252 sig_entry = add_type_unit (sig, slot);
7254 fill_in_sig_entry_from_dwo_entry (objfile, sig_entry, dwo_entry);
7255 sig_entry->per_cu.tu_read = 1;
7259 /* Subroutine of lookup_signatured_type.
7260 Look up the type for signature SIG, and if we can't find SIG in .gdb_index
7261 then try the DWP file. If the TU stub (skeleton) has been removed then
7262 it won't be in .gdb_index. */
7264 static struct signatured_type *
7265 lookup_dwp_signatured_type (struct dwarf2_cu *cu, ULONGEST sig)
7267 struct objfile *objfile = dwarf2_per_objfile->objfile;
7268 struct dwp_file *dwp_file = get_dwp_file ();
7269 struct dwo_unit *dwo_entry;
7270 struct signatured_type find_sig_entry, *sig_entry;
7273 gdb_assert (cu->dwo_unit && dwarf2_per_objfile->using_index);
7274 gdb_assert (dwp_file != NULL);
7276 /* If TU skeletons have been removed then we may not have read in any
7278 if (dwarf2_per_objfile->signatured_types == NULL)
7280 dwarf2_per_objfile->signatured_types
7281 = allocate_signatured_type_table (objfile);
7284 find_sig_entry.signature = sig;
7285 slot = htab_find_slot (dwarf2_per_objfile->signatured_types,
7286 &find_sig_entry, INSERT);
7287 sig_entry = (struct signatured_type *) *slot;
7289 /* Have we already tried to read this TU?
7290 Note: sig_entry can be NULL if the skeleton TU was removed (thus it
7291 needn't exist in the global table yet). */
7292 if (sig_entry != NULL)
7295 if (dwp_file->tus == NULL)
7297 dwo_entry = lookup_dwo_unit_in_dwp (dwp_file, NULL,
7298 sig, 1 /* is_debug_types */);
7299 if (dwo_entry == NULL)
7302 sig_entry = add_type_unit (sig, slot);
7303 fill_in_sig_entry_from_dwo_entry (objfile, sig_entry, dwo_entry);
7308 /* Lookup a signature based type for DW_FORM_ref_sig8.
7309 Returns NULL if signature SIG is not present in the table.
7310 It is up to the caller to complain about this. */
7312 static struct signatured_type *
7313 lookup_signatured_type (struct dwarf2_cu *cu, ULONGEST sig)
7316 && dwarf2_per_objfile->using_index)
7318 /* We're in a DWO/DWP file, and we're using .gdb_index.
7319 These cases require special processing. */
7320 if (get_dwp_file () == NULL)
7321 return lookup_dwo_signatured_type (cu, sig);
7323 return lookup_dwp_signatured_type (cu, sig);
7327 struct signatured_type find_entry, *entry;
7329 if (dwarf2_per_objfile->signatured_types == NULL)
7331 find_entry.signature = sig;
7332 entry = ((struct signatured_type *)
7333 htab_find (dwarf2_per_objfile->signatured_types, &find_entry));
7338 /* Low level DIE reading support. */
7340 /* Initialize a die_reader_specs struct from a dwarf2_cu struct. */
7343 init_cu_die_reader (struct die_reader_specs *reader,
7344 struct dwarf2_cu *cu,
7345 struct dwarf2_section_info *section,
7346 struct dwo_file *dwo_file)
7348 gdb_assert (section->readin && section->buffer != NULL);
7349 reader->abfd = get_section_bfd_owner (section);
7351 reader->dwo_file = dwo_file;
7352 reader->die_section = section;
7353 reader->buffer = section->buffer;
7354 reader->buffer_end = section->buffer + section->size;
7355 reader->comp_dir = NULL;
7358 /* Subroutine of init_cutu_and_read_dies to simplify it.
7359 Read in the rest of a CU/TU top level DIE from DWO_UNIT.
7360 There's just a lot of work to do, and init_cutu_and_read_dies is big enough
7363 STUB_COMP_UNIT_DIE is for the stub DIE, we copy over certain attributes
7364 from it to the DIE in the DWO. If NULL we are skipping the stub.
7365 STUB_COMP_DIR is similar to STUB_COMP_UNIT_DIE: When reading a TU directly
7366 from the DWO file, bypassing the stub, it contains the DW_AT_comp_dir
7367 attribute of the referencing CU. At most one of STUB_COMP_UNIT_DIE and
7368 STUB_COMP_DIR may be non-NULL.
7369 *RESULT_READER,*RESULT_INFO_PTR,*RESULT_COMP_UNIT_DIE,*RESULT_HAS_CHILDREN
7370 are filled in with the info of the DIE from the DWO file.
7371 ABBREV_TABLE_PROVIDED is non-zero if the caller of init_cutu_and_read_dies
7372 provided an abbrev table to use.
7373 The result is non-zero if a valid (non-dummy) DIE was found. */
7376 read_cutu_die_from_dwo (struct dwarf2_per_cu_data *this_cu,
7377 struct dwo_unit *dwo_unit,
7378 int abbrev_table_provided,
7379 struct die_info *stub_comp_unit_die,
7380 const char *stub_comp_dir,
7381 struct die_reader_specs *result_reader,
7382 const gdb_byte **result_info_ptr,
7383 struct die_info **result_comp_unit_die,
7384 int *result_has_children)
7386 struct objfile *objfile = dwarf2_per_objfile->objfile;
7387 struct dwarf2_cu *cu = this_cu->cu;
7388 struct dwarf2_section_info *section;
7390 const gdb_byte *begin_info_ptr, *info_ptr;
7391 struct attribute *comp_dir, *stmt_list, *low_pc, *high_pc, *ranges;
7392 int i,num_extra_attrs;
7393 struct dwarf2_section_info *dwo_abbrev_section;
7394 struct attribute *attr;
7395 struct die_info *comp_unit_die;
7397 /* At most one of these may be provided. */
7398 gdb_assert ((stub_comp_unit_die != NULL) + (stub_comp_dir != NULL) <= 1);
7400 /* These attributes aren't processed until later:
7401 DW_AT_stmt_list, DW_AT_low_pc, DW_AT_high_pc, DW_AT_ranges.
7402 DW_AT_comp_dir is used now, to find the DWO file, but it is also
7403 referenced later. However, these attributes are found in the stub
7404 which we won't have later. In order to not impose this complication
7405 on the rest of the code, we read them here and copy them to the
7414 if (stub_comp_unit_die != NULL)
7416 /* For TUs in DWO files, the DW_AT_stmt_list attribute lives in the
7418 if (! this_cu->is_debug_types)
7419 stmt_list = dwarf2_attr (stub_comp_unit_die, DW_AT_stmt_list, cu);
7420 low_pc = dwarf2_attr (stub_comp_unit_die, DW_AT_low_pc, cu);
7421 high_pc = dwarf2_attr (stub_comp_unit_die, DW_AT_high_pc, cu);
7422 ranges = dwarf2_attr (stub_comp_unit_die, DW_AT_ranges, cu);
7423 comp_dir = dwarf2_attr (stub_comp_unit_die, DW_AT_comp_dir, cu);
7425 /* There should be a DW_AT_addr_base attribute here (if needed).
7426 We need the value before we can process DW_FORM_GNU_addr_index. */
7428 attr = dwarf2_attr (stub_comp_unit_die, DW_AT_GNU_addr_base, cu);
7430 cu->addr_base = DW_UNSND (attr);
7432 /* There should be a DW_AT_ranges_base attribute here (if needed).
7433 We need the value before we can process DW_AT_ranges. */
7434 cu->ranges_base = 0;
7435 attr = dwarf2_attr (stub_comp_unit_die, DW_AT_GNU_ranges_base, cu);
7437 cu->ranges_base = DW_UNSND (attr);
7439 else if (stub_comp_dir != NULL)
7441 /* Reconstruct the comp_dir attribute to simplify the code below. */
7442 comp_dir = XOBNEW (&cu->comp_unit_obstack, struct attribute);
7443 comp_dir->name = DW_AT_comp_dir;
7444 comp_dir->form = DW_FORM_string;
7445 DW_STRING_IS_CANONICAL (comp_dir) = 0;
7446 DW_STRING (comp_dir) = stub_comp_dir;
7449 /* Set up for reading the DWO CU/TU. */
7450 cu->dwo_unit = dwo_unit;
7451 section = dwo_unit->section;
7452 dwarf2_read_section (objfile, section);
7453 abfd = get_section_bfd_owner (section);
7454 begin_info_ptr = info_ptr = (section->buffer
7455 + to_underlying (dwo_unit->sect_off));
7456 dwo_abbrev_section = &dwo_unit->dwo_file->sections.abbrev;
7457 init_cu_die_reader (result_reader, cu, section, dwo_unit->dwo_file);
7459 if (this_cu->is_debug_types)
7461 struct signatured_type *sig_type = (struct signatured_type *) this_cu;
7463 info_ptr = read_and_check_comp_unit_head (&cu->header, section,
7465 info_ptr, rcuh_kind::TYPE);
7466 /* This is not an assert because it can be caused by bad debug info. */
7467 if (sig_type->signature != cu->header.signature)
7469 error (_("Dwarf Error: signature mismatch %s vs %s while reading"
7470 " TU at offset 0x%x [in module %s]"),
7471 hex_string (sig_type->signature),
7472 hex_string (cu->header.signature),
7473 to_underlying (dwo_unit->sect_off),
7474 bfd_get_filename (abfd));
7476 gdb_assert (dwo_unit->sect_off == cu->header.sect_off);
7477 /* For DWOs coming from DWP files, we don't know the CU length
7478 nor the type's offset in the TU until now. */
7479 dwo_unit->length = get_cu_length (&cu->header);
7480 dwo_unit->type_offset_in_tu = cu->header.type_cu_offset_in_tu;
7482 /* Establish the type offset that can be used to lookup the type.
7483 For DWO files, we don't know it until now. */
7484 sig_type->type_offset_in_section
7485 = dwo_unit->sect_off + to_underlying (dwo_unit->type_offset_in_tu);
7489 info_ptr = read_and_check_comp_unit_head (&cu->header, section,
7491 info_ptr, rcuh_kind::COMPILE);
7492 gdb_assert (dwo_unit->sect_off == cu->header.sect_off);
7493 /* For DWOs coming from DWP files, we don't know the CU length
7495 dwo_unit->length = get_cu_length (&cu->header);
7498 /* Replace the CU's original abbrev table with the DWO's.
7499 Reminder: We can't read the abbrev table until we've read the header. */
7500 if (abbrev_table_provided)
7502 /* Don't free the provided abbrev table, the caller of
7503 init_cutu_and_read_dies owns it. */
7504 dwarf2_read_abbrevs (cu, dwo_abbrev_section);
7505 /* Ensure the DWO abbrev table gets freed. */
7506 make_cleanup (dwarf2_free_abbrev_table, cu);
7510 dwarf2_free_abbrev_table (cu);
7511 dwarf2_read_abbrevs (cu, dwo_abbrev_section);
7512 /* Leave any existing abbrev table cleanup as is. */
7515 /* Read in the die, but leave space to copy over the attributes
7516 from the stub. This has the benefit of simplifying the rest of
7517 the code - all the work to maintain the illusion of a single
7518 DW_TAG_{compile,type}_unit DIE is done here. */
7519 num_extra_attrs = ((stmt_list != NULL)
7523 + (comp_dir != NULL));
7524 info_ptr = read_full_die_1 (result_reader, result_comp_unit_die, info_ptr,
7525 result_has_children, num_extra_attrs);
7527 /* Copy over the attributes from the stub to the DIE we just read in. */
7528 comp_unit_die = *result_comp_unit_die;
7529 i = comp_unit_die->num_attrs;
7530 if (stmt_list != NULL)
7531 comp_unit_die->attrs[i++] = *stmt_list;
7533 comp_unit_die->attrs[i++] = *low_pc;
7534 if (high_pc != NULL)
7535 comp_unit_die->attrs[i++] = *high_pc;
7537 comp_unit_die->attrs[i++] = *ranges;
7538 if (comp_dir != NULL)
7539 comp_unit_die->attrs[i++] = *comp_dir;
7540 comp_unit_die->num_attrs += num_extra_attrs;
7542 if (dwarf_die_debug)
7544 fprintf_unfiltered (gdb_stdlog,
7545 "Read die from %s@0x%x of %s:\n",
7546 get_section_name (section),
7547 (unsigned) (begin_info_ptr - section->buffer),
7548 bfd_get_filename (abfd));
7549 dump_die (comp_unit_die, dwarf_die_debug);
7552 /* Save the comp_dir attribute. If there is no DWP file then we'll read
7553 TUs by skipping the stub and going directly to the entry in the DWO file.
7554 However, skipping the stub means we won't get DW_AT_comp_dir, so we have
7555 to get it via circuitous means. Blech. */
7556 if (comp_dir != NULL)
7557 result_reader->comp_dir = DW_STRING (comp_dir);
7559 /* Skip dummy compilation units. */
7560 if (info_ptr >= begin_info_ptr + dwo_unit->length
7561 || peek_abbrev_code (abfd, info_ptr) == 0)
7564 *result_info_ptr = info_ptr;
7568 /* Subroutine of init_cutu_and_read_dies to simplify it.
7569 Look up the DWO unit specified by COMP_UNIT_DIE of THIS_CU.
7570 Returns NULL if the specified DWO unit cannot be found. */
7572 static struct dwo_unit *
7573 lookup_dwo_unit (struct dwarf2_per_cu_data *this_cu,
7574 struct die_info *comp_unit_die)
7576 struct dwarf2_cu *cu = this_cu->cu;
7578 struct dwo_unit *dwo_unit;
7579 const char *comp_dir, *dwo_name;
7581 gdb_assert (cu != NULL);
7583 /* Yeah, we look dwo_name up again, but it simplifies the code. */
7584 dwo_name = dwarf2_string_attr (comp_unit_die, DW_AT_GNU_dwo_name, cu);
7585 comp_dir = dwarf2_string_attr (comp_unit_die, DW_AT_comp_dir, cu);
7587 if (this_cu->is_debug_types)
7589 struct signatured_type *sig_type;
7591 /* Since this_cu is the first member of struct signatured_type,
7592 we can go from a pointer to one to a pointer to the other. */
7593 sig_type = (struct signatured_type *) this_cu;
7594 signature = sig_type->signature;
7595 dwo_unit = lookup_dwo_type_unit (sig_type, dwo_name, comp_dir);
7599 struct attribute *attr;
7601 attr = dwarf2_attr (comp_unit_die, DW_AT_GNU_dwo_id, cu);
7603 error (_("Dwarf Error: missing dwo_id for dwo_name %s"
7605 dwo_name, objfile_name (this_cu->objfile));
7606 signature = DW_UNSND (attr);
7607 dwo_unit = lookup_dwo_comp_unit (this_cu, dwo_name, comp_dir,
7614 /* Subroutine of init_cutu_and_read_dies to simplify it.
7615 See it for a description of the parameters.
7616 Read a TU directly from a DWO file, bypassing the stub.
7618 Note: This function could be a little bit simpler if we shared cleanups
7619 with our caller, init_cutu_and_read_dies. That's generally a fragile thing
7620 to do, so we keep this function self-contained. Or we could move this
7621 into our caller, but it's complex enough already. */
7624 init_tu_and_read_dwo_dies (struct dwarf2_per_cu_data *this_cu,
7625 int use_existing_cu, int keep,
7626 die_reader_func_ftype *die_reader_func,
7629 struct dwarf2_cu *cu;
7630 struct signatured_type *sig_type;
7631 struct cleanup *cleanups, *free_cu_cleanup = NULL;
7632 struct die_reader_specs reader;
7633 const gdb_byte *info_ptr;
7634 struct die_info *comp_unit_die;
7637 /* Verify we can do the following downcast, and that we have the
7639 gdb_assert (this_cu->is_debug_types && this_cu->reading_dwo_directly);
7640 sig_type = (struct signatured_type *) this_cu;
7641 gdb_assert (sig_type->dwo_unit != NULL);
7643 cleanups = make_cleanup (null_cleanup, NULL);
7645 if (use_existing_cu && this_cu->cu != NULL)
7647 gdb_assert (this_cu->cu->dwo_unit == sig_type->dwo_unit);
7649 /* There's no need to do the rereading_dwo_cu handling that
7650 init_cutu_and_read_dies does since we don't read the stub. */
7654 /* If !use_existing_cu, this_cu->cu must be NULL. */
7655 gdb_assert (this_cu->cu == NULL);
7656 cu = XNEW (struct dwarf2_cu);
7657 init_one_comp_unit (cu, this_cu);
7658 /* If an error occurs while loading, release our storage. */
7659 free_cu_cleanup = make_cleanup (free_heap_comp_unit, cu);
7662 /* A future optimization, if needed, would be to use an existing
7663 abbrev table. When reading DWOs with skeletonless TUs, all the TUs
7664 could share abbrev tables. */
7666 if (read_cutu_die_from_dwo (this_cu, sig_type->dwo_unit,
7667 0 /* abbrev_table_provided */,
7668 NULL /* stub_comp_unit_die */,
7669 sig_type->dwo_unit->dwo_file->comp_dir,
7671 &comp_unit_die, &has_children) == 0)
7674 do_cleanups (cleanups);
7678 /* All the "real" work is done here. */
7679 die_reader_func (&reader, info_ptr, comp_unit_die, has_children, data);
7681 /* This duplicates the code in init_cutu_and_read_dies,
7682 but the alternative is making the latter more complex.
7683 This function is only for the special case of using DWO files directly:
7684 no point in overly complicating the general case just to handle this. */
7685 if (free_cu_cleanup != NULL)
7689 /* We've successfully allocated this compilation unit. Let our
7690 caller clean it up when finished with it. */
7691 discard_cleanups (free_cu_cleanup);
7693 /* We can only discard free_cu_cleanup and all subsequent cleanups.
7694 So we have to manually free the abbrev table. */
7695 dwarf2_free_abbrev_table (cu);
7697 /* Link this CU into read_in_chain. */
7698 this_cu->cu->read_in_chain = dwarf2_per_objfile->read_in_chain;
7699 dwarf2_per_objfile->read_in_chain = this_cu;
7702 do_cleanups (free_cu_cleanup);
7705 do_cleanups (cleanups);
7708 /* Initialize a CU (or TU) and read its DIEs.
7709 If the CU defers to a DWO file, read the DWO file as well.
7711 ABBREV_TABLE, if non-NULL, is the abbreviation table to use.
7712 Otherwise the table specified in the comp unit header is read in and used.
7713 This is an optimization for when we already have the abbrev table.
7715 If USE_EXISTING_CU is non-zero, and THIS_CU->cu is non-NULL, then use it.
7716 Otherwise, a new CU is allocated with xmalloc.
7718 If KEEP is non-zero, then if we allocated a dwarf2_cu we add it to
7719 read_in_chain. Otherwise the dwarf2_cu data is freed at the end.
7721 WARNING: If THIS_CU is a "dummy CU" (used as filler by the incremental
7722 linker) then DIE_READER_FUNC will not get called. */
7725 init_cutu_and_read_dies (struct dwarf2_per_cu_data *this_cu,
7726 struct abbrev_table *abbrev_table,
7727 int use_existing_cu, int keep,
7728 die_reader_func_ftype *die_reader_func,
7731 struct objfile *objfile = dwarf2_per_objfile->objfile;
7732 struct dwarf2_section_info *section = this_cu->section;
7733 bfd *abfd = get_section_bfd_owner (section);
7734 struct dwarf2_cu *cu;
7735 const gdb_byte *begin_info_ptr, *info_ptr;
7736 struct die_reader_specs reader;
7737 struct die_info *comp_unit_die;
7739 struct attribute *attr;
7740 struct cleanup *cleanups, *free_cu_cleanup = NULL;
7741 struct signatured_type *sig_type = NULL;
7742 struct dwarf2_section_info *abbrev_section;
7743 /* Non-zero if CU currently points to a DWO file and we need to
7744 reread it. When this happens we need to reread the skeleton die
7745 before we can reread the DWO file (this only applies to CUs, not TUs). */
7746 int rereading_dwo_cu = 0;
7748 if (dwarf_die_debug)
7749 fprintf_unfiltered (gdb_stdlog, "Reading %s unit at offset 0x%x\n",
7750 this_cu->is_debug_types ? "type" : "comp",
7751 to_underlying (this_cu->sect_off));
7753 if (use_existing_cu)
7756 /* If we're reading a TU directly from a DWO file, including a virtual DWO
7757 file (instead of going through the stub), short-circuit all of this. */
7758 if (this_cu->reading_dwo_directly)
7760 /* Narrow down the scope of possibilities to have to understand. */
7761 gdb_assert (this_cu->is_debug_types);
7762 gdb_assert (abbrev_table == NULL);
7763 init_tu_and_read_dwo_dies (this_cu, use_existing_cu, keep,
7764 die_reader_func, data);
7768 cleanups = make_cleanup (null_cleanup, NULL);
7770 /* This is cheap if the section is already read in. */
7771 dwarf2_read_section (objfile, section);
7773 begin_info_ptr = info_ptr = section->buffer + to_underlying (this_cu->sect_off);
7775 abbrev_section = get_abbrev_section_for_cu (this_cu);
7777 if (use_existing_cu && this_cu->cu != NULL)
7780 /* If this CU is from a DWO file we need to start over, we need to
7781 refetch the attributes from the skeleton CU.
7782 This could be optimized by retrieving those attributes from when we
7783 were here the first time: the previous comp_unit_die was stored in
7784 comp_unit_obstack. But there's no data yet that we need this
7786 if (cu->dwo_unit != NULL)
7787 rereading_dwo_cu = 1;
7791 /* If !use_existing_cu, this_cu->cu must be NULL. */
7792 gdb_assert (this_cu->cu == NULL);
7793 cu = XNEW (struct dwarf2_cu);
7794 init_one_comp_unit (cu, this_cu);
7795 /* If an error occurs while loading, release our storage. */
7796 free_cu_cleanup = make_cleanup (free_heap_comp_unit, cu);
7799 /* Get the header. */
7800 if (to_underlying (cu->header.first_die_cu_offset) != 0 && !rereading_dwo_cu)
7802 /* We already have the header, there's no need to read it in again. */
7803 info_ptr += to_underlying (cu->header.first_die_cu_offset);
7807 if (this_cu->is_debug_types)
7809 info_ptr = read_and_check_comp_unit_head (&cu->header, section,
7810 abbrev_section, info_ptr,
7813 /* Since per_cu is the first member of struct signatured_type,
7814 we can go from a pointer to one to a pointer to the other. */
7815 sig_type = (struct signatured_type *) this_cu;
7816 gdb_assert (sig_type->signature == cu->header.signature);
7817 gdb_assert (sig_type->type_offset_in_tu
7818 == cu->header.type_cu_offset_in_tu);
7819 gdb_assert (this_cu->sect_off == cu->header.sect_off);
7821 /* LENGTH has not been set yet for type units if we're
7822 using .gdb_index. */
7823 this_cu->length = get_cu_length (&cu->header);
7825 /* Establish the type offset that can be used to lookup the type. */
7826 sig_type->type_offset_in_section =
7827 this_cu->sect_off + to_underlying (sig_type->type_offset_in_tu);
7829 this_cu->dwarf_version = cu->header.version;
7833 info_ptr = read_and_check_comp_unit_head (&cu->header, section,
7836 rcuh_kind::COMPILE);
7838 gdb_assert (this_cu->sect_off == cu->header.sect_off);
7839 gdb_assert (this_cu->length == get_cu_length (&cu->header));
7840 this_cu->dwarf_version = cu->header.version;
7844 /* Skip dummy compilation units. */
7845 if (info_ptr >= begin_info_ptr + this_cu->length
7846 || peek_abbrev_code (abfd, info_ptr) == 0)
7848 do_cleanups (cleanups);
7852 /* If we don't have them yet, read the abbrevs for this compilation unit.
7853 And if we need to read them now, make sure they're freed when we're
7854 done. Note that it's important that if the CU had an abbrev table
7855 on entry we don't free it when we're done: Somewhere up the call stack
7856 it may be in use. */
7857 if (abbrev_table != NULL)
7859 gdb_assert (cu->abbrev_table == NULL);
7860 gdb_assert (cu->header.abbrev_sect_off == abbrev_table->sect_off);
7861 cu->abbrev_table = abbrev_table;
7863 else if (cu->abbrev_table == NULL)
7865 dwarf2_read_abbrevs (cu, abbrev_section);
7866 make_cleanup (dwarf2_free_abbrev_table, cu);
7868 else if (rereading_dwo_cu)
7870 dwarf2_free_abbrev_table (cu);
7871 dwarf2_read_abbrevs (cu, abbrev_section);
7874 /* Read the top level CU/TU die. */
7875 init_cu_die_reader (&reader, cu, section, NULL);
7876 info_ptr = read_full_die (&reader, &comp_unit_die, info_ptr, &has_children);
7878 /* If we are in a DWO stub, process it and then read in the "real" CU/TU
7880 Note that if USE_EXISTING_OK != 0, and THIS_CU->cu already contains a
7881 DWO CU, that this test will fail (the attribute will not be present). */
7882 attr = dwarf2_attr (comp_unit_die, DW_AT_GNU_dwo_name, cu);
7885 struct dwo_unit *dwo_unit;
7886 struct die_info *dwo_comp_unit_die;
7890 complaint (&symfile_complaints,
7891 _("compilation unit with DW_AT_GNU_dwo_name"
7892 " has children (offset 0x%x) [in module %s]"),
7893 to_underlying (this_cu->sect_off), bfd_get_filename (abfd));
7895 dwo_unit = lookup_dwo_unit (this_cu, comp_unit_die);
7896 if (dwo_unit != NULL)
7898 if (read_cutu_die_from_dwo (this_cu, dwo_unit,
7899 abbrev_table != NULL,
7900 comp_unit_die, NULL,
7902 &dwo_comp_unit_die, &has_children) == 0)
7905 do_cleanups (cleanups);
7908 comp_unit_die = dwo_comp_unit_die;
7912 /* Yikes, we couldn't find the rest of the DIE, we only have
7913 the stub. A complaint has already been logged. There's
7914 not much more we can do except pass on the stub DIE to
7915 die_reader_func. We don't want to throw an error on bad
7920 /* All of the above is setup for this call. Yikes. */
7921 die_reader_func (&reader, info_ptr, comp_unit_die, has_children, data);
7923 /* Done, clean up. */
7924 if (free_cu_cleanup != NULL)
7928 /* We've successfully allocated this compilation unit. Let our
7929 caller clean it up when finished with it. */
7930 discard_cleanups (free_cu_cleanup);
7932 /* We can only discard free_cu_cleanup and all subsequent cleanups.
7933 So we have to manually free the abbrev table. */
7934 dwarf2_free_abbrev_table (cu);
7936 /* Link this CU into read_in_chain. */
7937 this_cu->cu->read_in_chain = dwarf2_per_objfile->read_in_chain;
7938 dwarf2_per_objfile->read_in_chain = this_cu;
7941 do_cleanups (free_cu_cleanup);
7944 do_cleanups (cleanups);
7947 /* Read CU/TU THIS_CU but do not follow DW_AT_GNU_dwo_name if present.
7948 DWO_FILE, if non-NULL, is the DWO file to read (the caller is assumed
7949 to have already done the lookup to find the DWO file).
7951 The caller is required to fill in THIS_CU->section, THIS_CU->offset, and
7952 THIS_CU->is_debug_types, but nothing else.
7954 We fill in THIS_CU->length.
7956 WARNING: If THIS_CU is a "dummy CU" (used as filler by the incremental
7957 linker) then DIE_READER_FUNC will not get called.
7959 THIS_CU->cu is always freed when done.
7960 This is done in order to not leave THIS_CU->cu in a state where we have
7961 to care whether it refers to the "main" CU or the DWO CU. */
7964 init_cutu_and_read_dies_no_follow (struct dwarf2_per_cu_data *this_cu,
7965 struct dwo_file *dwo_file,
7966 die_reader_func_ftype *die_reader_func,
7969 struct objfile *objfile = dwarf2_per_objfile->objfile;
7970 struct dwarf2_section_info *section = this_cu->section;
7971 bfd *abfd = get_section_bfd_owner (section);
7972 struct dwarf2_section_info *abbrev_section;
7973 struct dwarf2_cu cu;
7974 const gdb_byte *begin_info_ptr, *info_ptr;
7975 struct die_reader_specs reader;
7976 struct cleanup *cleanups;
7977 struct die_info *comp_unit_die;
7980 if (dwarf_die_debug)
7981 fprintf_unfiltered (gdb_stdlog, "Reading %s unit at offset 0x%x\n",
7982 this_cu->is_debug_types ? "type" : "comp",
7983 to_underlying (this_cu->sect_off));
7985 gdb_assert (this_cu->cu == NULL);
7987 abbrev_section = (dwo_file != NULL
7988 ? &dwo_file->sections.abbrev
7989 : get_abbrev_section_for_cu (this_cu));
7991 /* This is cheap if the section is already read in. */
7992 dwarf2_read_section (objfile, section);
7994 init_one_comp_unit (&cu, this_cu);
7996 cleanups = make_cleanup (free_stack_comp_unit, &cu);
7998 begin_info_ptr = info_ptr = section->buffer + to_underlying (this_cu->sect_off);
7999 info_ptr = read_and_check_comp_unit_head (&cu.header, section,
8000 abbrev_section, info_ptr,
8001 (this_cu->is_debug_types
8003 : rcuh_kind::COMPILE));
8005 this_cu->length = get_cu_length (&cu.header);
8007 /* Skip dummy compilation units. */
8008 if (info_ptr >= begin_info_ptr + this_cu->length
8009 || peek_abbrev_code (abfd, info_ptr) == 0)
8011 do_cleanups (cleanups);
8015 dwarf2_read_abbrevs (&cu, abbrev_section);
8016 make_cleanup (dwarf2_free_abbrev_table, &cu);
8018 init_cu_die_reader (&reader, &cu, section, dwo_file);
8019 info_ptr = read_full_die (&reader, &comp_unit_die, info_ptr, &has_children);
8021 die_reader_func (&reader, info_ptr, comp_unit_die, has_children, data);
8023 do_cleanups (cleanups);
8026 /* Read a CU/TU, except that this does not look for DW_AT_GNU_dwo_name and
8027 does not lookup the specified DWO file.
8028 This cannot be used to read DWO files.
8030 THIS_CU->cu is always freed when done.
8031 This is done in order to not leave THIS_CU->cu in a state where we have
8032 to care whether it refers to the "main" CU or the DWO CU.
8033 We can revisit this if the data shows there's a performance issue. */
8036 init_cutu_and_read_dies_simple (struct dwarf2_per_cu_data *this_cu,
8037 die_reader_func_ftype *die_reader_func,
8040 init_cutu_and_read_dies_no_follow (this_cu, NULL, die_reader_func, data);
8043 /* Type Unit Groups.
8045 Type Unit Groups are a way to collapse the set of all TUs (type units) into
8046 a more manageable set. The grouping is done by DW_AT_stmt_list entry
8047 so that all types coming from the same compilation (.o file) are grouped
8048 together. A future step could be to put the types in the same symtab as
8049 the CU the types ultimately came from. */
8052 hash_type_unit_group (const void *item)
8054 const struct type_unit_group *tu_group
8055 = (const struct type_unit_group *) item;
8057 return hash_stmt_list_entry (&tu_group->hash);
8061 eq_type_unit_group (const void *item_lhs, const void *item_rhs)
8063 const struct type_unit_group *lhs = (const struct type_unit_group *) item_lhs;
8064 const struct type_unit_group *rhs = (const struct type_unit_group *) item_rhs;
8066 return eq_stmt_list_entry (&lhs->hash, &rhs->hash);
8069 /* Allocate a hash table for type unit groups. */
8072 allocate_type_unit_groups_table (void)
8074 return htab_create_alloc_ex (3,
8075 hash_type_unit_group,
8078 &dwarf2_per_objfile->objfile->objfile_obstack,
8079 hashtab_obstack_allocate,
8080 dummy_obstack_deallocate);
8083 /* Type units that don't have DW_AT_stmt_list are grouped into their own
8084 partial symtabs. We combine several TUs per psymtab to not let the size
8085 of any one psymtab grow too big. */
8086 #define NO_STMT_LIST_TYPE_UNIT_PSYMTAB (1 << 31)
8087 #define NO_STMT_LIST_TYPE_UNIT_PSYMTAB_SIZE 10
8089 /* Helper routine for get_type_unit_group.
8090 Create the type_unit_group object used to hold one or more TUs. */
8092 static struct type_unit_group *
8093 create_type_unit_group (struct dwarf2_cu *cu, sect_offset line_offset_struct)
8095 struct objfile *objfile = dwarf2_per_objfile->objfile;
8096 struct dwarf2_per_cu_data *per_cu;
8097 struct type_unit_group *tu_group;
8099 tu_group = OBSTACK_ZALLOC (&objfile->objfile_obstack,
8100 struct type_unit_group);
8101 per_cu = &tu_group->per_cu;
8102 per_cu->objfile = objfile;
8104 if (dwarf2_per_objfile->using_index)
8106 per_cu->v.quick = OBSTACK_ZALLOC (&objfile->objfile_obstack,
8107 struct dwarf2_per_cu_quick_data);
8111 unsigned int line_offset = to_underlying (line_offset_struct);
8112 struct partial_symtab *pst;
8115 /* Give the symtab a useful name for debug purposes. */
8116 if ((line_offset & NO_STMT_LIST_TYPE_UNIT_PSYMTAB) != 0)
8117 name = xstrprintf ("<type_units_%d>",
8118 (line_offset & ~NO_STMT_LIST_TYPE_UNIT_PSYMTAB));
8120 name = xstrprintf ("<type_units_at_0x%x>", line_offset);
8122 pst = create_partial_symtab (per_cu, name);
8128 tu_group->hash.dwo_unit = cu->dwo_unit;
8129 tu_group->hash.line_sect_off = line_offset_struct;
8134 /* Look up the type_unit_group for type unit CU, and create it if necessary.
8135 STMT_LIST is a DW_AT_stmt_list attribute. */
8137 static struct type_unit_group *
8138 get_type_unit_group (struct dwarf2_cu *cu, const struct attribute *stmt_list)
8140 struct tu_stats *tu_stats = &dwarf2_per_objfile->tu_stats;
8141 struct type_unit_group *tu_group;
8143 unsigned int line_offset;
8144 struct type_unit_group type_unit_group_for_lookup;
8146 if (dwarf2_per_objfile->type_unit_groups == NULL)
8148 dwarf2_per_objfile->type_unit_groups =
8149 allocate_type_unit_groups_table ();
8152 /* Do we need to create a new group, or can we use an existing one? */
8156 line_offset = DW_UNSND (stmt_list);
8157 ++tu_stats->nr_symtab_sharers;
8161 /* Ugh, no stmt_list. Rare, but we have to handle it.
8162 We can do various things here like create one group per TU or
8163 spread them over multiple groups to split up the expansion work.
8164 To avoid worst case scenarios (too many groups or too large groups)
8165 we, umm, group them in bunches. */
8166 line_offset = (NO_STMT_LIST_TYPE_UNIT_PSYMTAB
8167 | (tu_stats->nr_stmt_less_type_units
8168 / NO_STMT_LIST_TYPE_UNIT_PSYMTAB_SIZE));
8169 ++tu_stats->nr_stmt_less_type_units;
8172 type_unit_group_for_lookup.hash.dwo_unit = cu->dwo_unit;
8173 type_unit_group_for_lookup.hash.line_sect_off = (sect_offset) line_offset;
8174 slot = htab_find_slot (dwarf2_per_objfile->type_unit_groups,
8175 &type_unit_group_for_lookup, INSERT);
8178 tu_group = (struct type_unit_group *) *slot;
8179 gdb_assert (tu_group != NULL);
8183 sect_offset line_offset_struct = (sect_offset) line_offset;
8184 tu_group = create_type_unit_group (cu, line_offset_struct);
8186 ++tu_stats->nr_symtabs;
8192 /* Partial symbol tables. */
8194 /* Create a psymtab named NAME and assign it to PER_CU.
8196 The caller must fill in the following details:
8197 dirname, textlow, texthigh. */
8199 static struct partial_symtab *
8200 create_partial_symtab (struct dwarf2_per_cu_data *per_cu, const char *name)
8202 struct objfile *objfile = per_cu->objfile;
8203 struct partial_symtab *pst;
8205 pst = start_psymtab_common (objfile, name, 0,
8206 objfile->global_psymbols,
8207 objfile->static_psymbols);
8209 pst->psymtabs_addrmap_supported = 1;
8211 /* This is the glue that links PST into GDB's symbol API. */
8212 pst->read_symtab_private = per_cu;
8213 pst->read_symtab = dwarf2_read_symtab;
8214 per_cu->v.psymtab = pst;
8219 /* The DATA object passed to process_psymtab_comp_unit_reader has this
8222 struct process_psymtab_comp_unit_data
8224 /* True if we are reading a DW_TAG_partial_unit. */
8226 int want_partial_unit;
8228 /* The "pretend" language that is used if the CU doesn't declare a
8231 enum language pretend_language;
8234 /* die_reader_func for process_psymtab_comp_unit. */
8237 process_psymtab_comp_unit_reader (const struct die_reader_specs *reader,
8238 const gdb_byte *info_ptr,
8239 struct die_info *comp_unit_die,
8243 struct dwarf2_cu *cu = reader->cu;
8244 struct objfile *objfile = cu->objfile;
8245 struct gdbarch *gdbarch = get_objfile_arch (objfile);
8246 struct dwarf2_per_cu_data *per_cu = cu->per_cu;
8248 CORE_ADDR best_lowpc = 0, best_highpc = 0;
8249 struct partial_symtab *pst;
8250 enum pc_bounds_kind cu_bounds_kind;
8251 const char *filename;
8252 struct process_psymtab_comp_unit_data *info
8253 = (struct process_psymtab_comp_unit_data *) data;
8255 if (comp_unit_die->tag == DW_TAG_partial_unit && !info->want_partial_unit)
8258 gdb_assert (! per_cu->is_debug_types);
8260 prepare_one_comp_unit (cu, comp_unit_die, info->pretend_language);
8262 cu->list_in_scope = &file_symbols;
8264 /* Allocate a new partial symbol table structure. */
8265 filename = dwarf2_string_attr (comp_unit_die, DW_AT_name, cu);
8266 if (filename == NULL)
8269 pst = create_partial_symtab (per_cu, filename);
8271 /* This must be done before calling dwarf2_build_include_psymtabs. */
8272 pst->dirname = dwarf2_string_attr (comp_unit_die, DW_AT_comp_dir, cu);
8274 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
8276 dwarf2_find_base_address (comp_unit_die, cu);
8278 /* Possibly set the default values of LOWPC and HIGHPC from
8280 cu_bounds_kind = dwarf2_get_pc_bounds (comp_unit_die, &best_lowpc,
8281 &best_highpc, cu, pst);
8282 if (cu_bounds_kind == PC_BOUNDS_HIGH_LOW && best_lowpc < best_highpc)
8283 /* Store the contiguous range if it is not empty; it can be empty for
8284 CUs with no code. */
8285 addrmap_set_empty (objfile->psymtabs_addrmap,
8286 gdbarch_adjust_dwarf2_addr (gdbarch,
8287 best_lowpc + baseaddr),
8288 gdbarch_adjust_dwarf2_addr (gdbarch,
8289 best_highpc + baseaddr) - 1,
8292 /* Check if comp unit has_children.
8293 If so, read the rest of the partial symbols from this comp unit.
8294 If not, there's no more debug_info for this comp unit. */
8297 struct partial_die_info *first_die;
8298 CORE_ADDR lowpc, highpc;
8300 lowpc = ((CORE_ADDR) -1);
8301 highpc = ((CORE_ADDR) 0);
8303 first_die = load_partial_dies (reader, info_ptr, 1);
8305 scan_partial_symbols (first_die, &lowpc, &highpc,
8306 cu_bounds_kind <= PC_BOUNDS_INVALID, cu);
8308 /* If we didn't find a lowpc, set it to highpc to avoid
8309 complaints from `maint check'. */
8310 if (lowpc == ((CORE_ADDR) -1))
8313 /* If the compilation unit didn't have an explicit address range,
8314 then use the information extracted from its child dies. */
8315 if (cu_bounds_kind <= PC_BOUNDS_INVALID)
8318 best_highpc = highpc;
8321 pst->textlow = gdbarch_adjust_dwarf2_addr (gdbarch, best_lowpc + baseaddr);
8322 pst->texthigh = gdbarch_adjust_dwarf2_addr (gdbarch, best_highpc + baseaddr);
8324 end_psymtab_common (objfile, pst);
8326 if (!VEC_empty (dwarf2_per_cu_ptr, cu->per_cu->imported_symtabs))
8329 int len = VEC_length (dwarf2_per_cu_ptr, cu->per_cu->imported_symtabs);
8330 struct dwarf2_per_cu_data *iter;
8332 /* Fill in 'dependencies' here; we fill in 'users' in a
8334 pst->number_of_dependencies = len;
8336 XOBNEWVEC (&objfile->objfile_obstack, struct partial_symtab *, len);
8338 VEC_iterate (dwarf2_per_cu_ptr, cu->per_cu->imported_symtabs,
8341 pst->dependencies[i] = iter->v.psymtab;
8343 VEC_free (dwarf2_per_cu_ptr, cu->per_cu->imported_symtabs);
8346 /* Get the list of files included in the current compilation unit,
8347 and build a psymtab for each of them. */
8348 dwarf2_build_include_psymtabs (cu, comp_unit_die, pst);
8350 if (dwarf_read_debug)
8352 struct gdbarch *gdbarch = get_objfile_arch (objfile);
8354 fprintf_unfiltered (gdb_stdlog,
8355 "Psymtab for %s unit @0x%x: %s - %s"
8356 ", %d global, %d static syms\n",
8357 per_cu->is_debug_types ? "type" : "comp",
8358 to_underlying (per_cu->sect_off),
8359 paddress (gdbarch, pst->textlow),
8360 paddress (gdbarch, pst->texthigh),
8361 pst->n_global_syms, pst->n_static_syms);
8365 /* Subroutine of dwarf2_build_psymtabs_hard to simplify it.
8366 Process compilation unit THIS_CU for a psymtab. */
8369 process_psymtab_comp_unit (struct dwarf2_per_cu_data *this_cu,
8370 int want_partial_unit,
8371 enum language pretend_language)
8373 /* If this compilation unit was already read in, free the
8374 cached copy in order to read it in again. This is
8375 necessary because we skipped some symbols when we first
8376 read in the compilation unit (see load_partial_dies).
8377 This problem could be avoided, but the benefit is unclear. */
8378 if (this_cu->cu != NULL)
8379 free_one_cached_comp_unit (this_cu);
8381 if (this_cu->is_debug_types)
8382 init_cutu_and_read_dies (this_cu, NULL, 0, 0, build_type_psymtabs_reader,
8386 process_psymtab_comp_unit_data info;
8387 info.want_partial_unit = want_partial_unit;
8388 info.pretend_language = pretend_language;
8389 init_cutu_and_read_dies (this_cu, NULL, 0, 0,
8390 process_psymtab_comp_unit_reader, &info);
8393 /* Age out any secondary CUs. */
8394 age_cached_comp_units ();
8397 /* Reader function for build_type_psymtabs. */
8400 build_type_psymtabs_reader (const struct die_reader_specs *reader,
8401 const gdb_byte *info_ptr,
8402 struct die_info *type_unit_die,
8406 struct objfile *objfile = dwarf2_per_objfile->objfile;
8407 struct dwarf2_cu *cu = reader->cu;
8408 struct dwarf2_per_cu_data *per_cu = cu->per_cu;
8409 struct signatured_type *sig_type;
8410 struct type_unit_group *tu_group;
8411 struct attribute *attr;
8412 struct partial_die_info *first_die;
8413 CORE_ADDR lowpc, highpc;
8414 struct partial_symtab *pst;
8416 gdb_assert (data == NULL);
8417 gdb_assert (per_cu->is_debug_types);
8418 sig_type = (struct signatured_type *) per_cu;
8423 attr = dwarf2_attr_no_follow (type_unit_die, DW_AT_stmt_list);
8424 tu_group = get_type_unit_group (cu, attr);
8426 VEC_safe_push (sig_type_ptr, tu_group->tus, sig_type);
8428 prepare_one_comp_unit (cu, type_unit_die, language_minimal);
8429 cu->list_in_scope = &file_symbols;
8430 pst = create_partial_symtab (per_cu, "");
8433 first_die = load_partial_dies (reader, info_ptr, 1);
8435 lowpc = (CORE_ADDR) -1;
8436 highpc = (CORE_ADDR) 0;
8437 scan_partial_symbols (first_die, &lowpc, &highpc, 0, cu);
8439 end_psymtab_common (objfile, pst);
8442 /* Struct used to sort TUs by their abbreviation table offset. */
8444 struct tu_abbrev_offset
8446 struct signatured_type *sig_type;
8447 sect_offset abbrev_offset;
8450 /* Helper routine for build_type_psymtabs_1, passed to qsort. */
8453 sort_tu_by_abbrev_offset (const void *ap, const void *bp)
8455 const struct tu_abbrev_offset * const *a
8456 = (const struct tu_abbrev_offset * const*) ap;
8457 const struct tu_abbrev_offset * const *b
8458 = (const struct tu_abbrev_offset * const*) bp;
8459 sect_offset aoff = (*a)->abbrev_offset;
8460 sect_offset boff = (*b)->abbrev_offset;
8462 return (aoff > boff) - (aoff < boff);
8465 /* Efficiently read all the type units.
8466 This does the bulk of the work for build_type_psymtabs.
8468 The efficiency is because we sort TUs by the abbrev table they use and
8469 only read each abbrev table once. In one program there are 200K TUs
8470 sharing 8K abbrev tables.
8472 The main purpose of this function is to support building the
8473 dwarf2_per_objfile->type_unit_groups table.
8474 TUs typically share the DW_AT_stmt_list of the CU they came from, so we
8475 can collapse the search space by grouping them by stmt_list.
8476 The savings can be significant, in the same program from above the 200K TUs
8477 share 8K stmt_list tables.
8479 FUNC is expected to call get_type_unit_group, which will create the
8480 struct type_unit_group if necessary and add it to
8481 dwarf2_per_objfile->type_unit_groups. */
8484 build_type_psymtabs_1 (void)
8486 struct tu_stats *tu_stats = &dwarf2_per_objfile->tu_stats;
8487 struct cleanup *cleanups;
8488 struct abbrev_table *abbrev_table;
8489 sect_offset abbrev_offset;
8490 struct tu_abbrev_offset *sorted_by_abbrev;
8493 /* It's up to the caller to not call us multiple times. */
8494 gdb_assert (dwarf2_per_objfile->type_unit_groups == NULL);
8496 if (dwarf2_per_objfile->n_type_units == 0)
8499 /* TUs typically share abbrev tables, and there can be way more TUs than
8500 abbrev tables. Sort by abbrev table to reduce the number of times we
8501 read each abbrev table in.
8502 Alternatives are to punt or to maintain a cache of abbrev tables.
8503 This is simpler and efficient enough for now.
8505 Later we group TUs by their DW_AT_stmt_list value (as this defines the
8506 symtab to use). Typically TUs with the same abbrev offset have the same
8507 stmt_list value too so in practice this should work well.
8509 The basic algorithm here is:
8511 sort TUs by abbrev table
8512 for each TU with same abbrev table:
8513 read abbrev table if first user
8514 read TU top level DIE
8515 [IWBN if DWO skeletons had DW_AT_stmt_list]
8518 if (dwarf_read_debug)
8519 fprintf_unfiltered (gdb_stdlog, "Building type unit groups ...\n");
8521 /* Sort in a separate table to maintain the order of all_type_units
8522 for .gdb_index: TU indices directly index all_type_units. */
8523 sorted_by_abbrev = XNEWVEC (struct tu_abbrev_offset,
8524 dwarf2_per_objfile->n_type_units);
8525 for (i = 0; i < dwarf2_per_objfile->n_type_units; ++i)
8527 struct signatured_type *sig_type = dwarf2_per_objfile->all_type_units[i];
8529 sorted_by_abbrev[i].sig_type = sig_type;
8530 sorted_by_abbrev[i].abbrev_offset =
8531 read_abbrev_offset (sig_type->per_cu.section,
8532 sig_type->per_cu.sect_off);
8534 cleanups = make_cleanup (xfree, sorted_by_abbrev);
8535 qsort (sorted_by_abbrev, dwarf2_per_objfile->n_type_units,
8536 sizeof (struct tu_abbrev_offset), sort_tu_by_abbrev_offset);
8538 abbrev_offset = (sect_offset) ~(unsigned) 0;
8539 abbrev_table = NULL;
8540 make_cleanup (abbrev_table_free_cleanup, &abbrev_table);
8542 for (i = 0; i < dwarf2_per_objfile->n_type_units; ++i)
8544 const struct tu_abbrev_offset *tu = &sorted_by_abbrev[i];
8546 /* Switch to the next abbrev table if necessary. */
8547 if (abbrev_table == NULL
8548 || tu->abbrev_offset != abbrev_offset)
8550 if (abbrev_table != NULL)
8552 abbrev_table_free (abbrev_table);
8553 /* Reset to NULL in case abbrev_table_read_table throws
8554 an error: abbrev_table_free_cleanup will get called. */
8555 abbrev_table = NULL;
8557 abbrev_offset = tu->abbrev_offset;
8559 abbrev_table_read_table (&dwarf2_per_objfile->abbrev,
8561 ++tu_stats->nr_uniq_abbrev_tables;
8564 init_cutu_and_read_dies (&tu->sig_type->per_cu, abbrev_table, 0, 0,
8565 build_type_psymtabs_reader, NULL);
8568 do_cleanups (cleanups);
8571 /* Print collected type unit statistics. */
8574 print_tu_stats (void)
8576 struct tu_stats *tu_stats = &dwarf2_per_objfile->tu_stats;
8578 fprintf_unfiltered (gdb_stdlog, "Type unit statistics:\n");
8579 fprintf_unfiltered (gdb_stdlog, " %d TUs\n",
8580 dwarf2_per_objfile->n_type_units);
8581 fprintf_unfiltered (gdb_stdlog, " %d uniq abbrev tables\n",
8582 tu_stats->nr_uniq_abbrev_tables);
8583 fprintf_unfiltered (gdb_stdlog, " %d symtabs from stmt_list entries\n",
8584 tu_stats->nr_symtabs);
8585 fprintf_unfiltered (gdb_stdlog, " %d symtab sharers\n",
8586 tu_stats->nr_symtab_sharers);
8587 fprintf_unfiltered (gdb_stdlog, " %d type units without a stmt_list\n",
8588 tu_stats->nr_stmt_less_type_units);
8589 fprintf_unfiltered (gdb_stdlog, " %d all_type_units reallocs\n",
8590 tu_stats->nr_all_type_units_reallocs);
8593 /* Traversal function for build_type_psymtabs. */
8596 build_type_psymtab_dependencies (void **slot, void *info)
8598 struct objfile *objfile = dwarf2_per_objfile->objfile;
8599 struct type_unit_group *tu_group = (struct type_unit_group *) *slot;
8600 struct dwarf2_per_cu_data *per_cu = &tu_group->per_cu;
8601 struct partial_symtab *pst = per_cu->v.psymtab;
8602 int len = VEC_length (sig_type_ptr, tu_group->tus);
8603 struct signatured_type *iter;
8606 gdb_assert (len > 0);
8607 gdb_assert (IS_TYPE_UNIT_GROUP (per_cu));
8609 pst->number_of_dependencies = len;
8611 XOBNEWVEC (&objfile->objfile_obstack, struct partial_symtab *, len);
8613 VEC_iterate (sig_type_ptr, tu_group->tus, i, iter);
8616 gdb_assert (iter->per_cu.is_debug_types);
8617 pst->dependencies[i] = iter->per_cu.v.psymtab;
8618 iter->type_unit_group = tu_group;
8621 VEC_free (sig_type_ptr, tu_group->tus);
8626 /* Subroutine of dwarf2_build_psymtabs_hard to simplify it.
8627 Build partial symbol tables for the .debug_types comp-units. */
8630 build_type_psymtabs (struct objfile *objfile)
8632 if (! create_all_type_units (objfile))
8635 build_type_psymtabs_1 ();
8638 /* Traversal function for process_skeletonless_type_unit.
8639 Read a TU in a DWO file and build partial symbols for it. */
8642 process_skeletonless_type_unit (void **slot, void *info)
8644 struct dwo_unit *dwo_unit = (struct dwo_unit *) *slot;
8645 struct objfile *objfile = (struct objfile *) info;
8646 struct signatured_type find_entry, *entry;
8648 /* If this TU doesn't exist in the global table, add it and read it in. */
8650 if (dwarf2_per_objfile->signatured_types == NULL)
8652 dwarf2_per_objfile->signatured_types
8653 = allocate_signatured_type_table (objfile);
8656 find_entry.signature = dwo_unit->signature;
8657 slot = htab_find_slot (dwarf2_per_objfile->signatured_types, &find_entry,
8659 /* If we've already seen this type there's nothing to do. What's happening
8660 is we're doing our own version of comdat-folding here. */
8664 /* This does the job that create_all_type_units would have done for
8666 entry = add_type_unit (dwo_unit->signature, slot);
8667 fill_in_sig_entry_from_dwo_entry (objfile, entry, dwo_unit);
8670 /* This does the job that build_type_psymtabs_1 would have done. */
8671 init_cutu_and_read_dies (&entry->per_cu, NULL, 0, 0,
8672 build_type_psymtabs_reader, NULL);
8677 /* Traversal function for process_skeletonless_type_units. */
8680 process_dwo_file_for_skeletonless_type_units (void **slot, void *info)
8682 struct dwo_file *dwo_file = (struct dwo_file *) *slot;
8684 if (dwo_file->tus != NULL)
8686 htab_traverse_noresize (dwo_file->tus,
8687 process_skeletonless_type_unit, info);
8693 /* Scan all TUs of DWO files, verifying we've processed them.
8694 This is needed in case a TU was emitted without its skeleton.
8695 Note: This can't be done until we know what all the DWO files are. */
8698 process_skeletonless_type_units (struct objfile *objfile)
8700 /* Skeletonless TUs in DWP files without .gdb_index is not supported yet. */
8701 if (get_dwp_file () == NULL
8702 && dwarf2_per_objfile->dwo_files != NULL)
8704 htab_traverse_noresize (dwarf2_per_objfile->dwo_files,
8705 process_dwo_file_for_skeletonless_type_units,
8710 /* Compute the 'user' field for each psymtab in OBJFILE. */
8713 set_partial_user (struct objfile *objfile)
8717 for (i = 0; i < dwarf2_per_objfile->n_comp_units; ++i)
8719 struct dwarf2_per_cu_data *per_cu = dw2_get_cutu (i);
8720 struct partial_symtab *pst = per_cu->v.psymtab;
8726 for (j = 0; j < pst->number_of_dependencies; ++j)
8728 /* Set the 'user' field only if it is not already set. */
8729 if (pst->dependencies[j]->user == NULL)
8730 pst->dependencies[j]->user = pst;
8735 /* Build the partial symbol table by doing a quick pass through the
8736 .debug_info and .debug_abbrev sections. */
8739 dwarf2_build_psymtabs_hard (struct objfile *objfile)
8741 struct cleanup *back_to;
8744 if (dwarf_read_debug)
8746 fprintf_unfiltered (gdb_stdlog, "Building psymtabs of objfile %s ...\n",
8747 objfile_name (objfile));
8750 dwarf2_per_objfile->reading_partial_symbols = 1;
8752 dwarf2_read_section (objfile, &dwarf2_per_objfile->info);
8754 /* Any cached compilation units will be linked by the per-objfile
8755 read_in_chain. Make sure to free them when we're done. */
8756 back_to = make_cleanup (free_cached_comp_units, NULL);
8758 build_type_psymtabs (objfile);
8760 create_all_comp_units (objfile);
8762 /* Create a temporary address map on a temporary obstack. We later
8763 copy this to the final obstack. */
8764 auto_obstack temp_obstack;
8766 scoped_restore save_psymtabs_addrmap
8767 = make_scoped_restore (&objfile->psymtabs_addrmap,
8768 addrmap_create_mutable (&temp_obstack));
8770 for (i = 0; i < dwarf2_per_objfile->n_comp_units; ++i)
8772 struct dwarf2_per_cu_data *per_cu = dw2_get_cutu (i);
8774 process_psymtab_comp_unit (per_cu, 0, language_minimal);
8777 /* This has to wait until we read the CUs, we need the list of DWOs. */
8778 process_skeletonless_type_units (objfile);
8780 /* Now that all TUs have been processed we can fill in the dependencies. */
8781 if (dwarf2_per_objfile->type_unit_groups != NULL)
8783 htab_traverse_noresize (dwarf2_per_objfile->type_unit_groups,
8784 build_type_psymtab_dependencies, NULL);
8787 if (dwarf_read_debug)
8790 set_partial_user (objfile);
8792 objfile->psymtabs_addrmap = addrmap_create_fixed (objfile->psymtabs_addrmap,
8793 &objfile->objfile_obstack);
8794 /* At this point we want to keep the address map. */
8795 save_psymtabs_addrmap.release ();
8797 do_cleanups (back_to);
8799 if (dwarf_read_debug)
8800 fprintf_unfiltered (gdb_stdlog, "Done building psymtabs of %s\n",
8801 objfile_name (objfile));
8804 /* die_reader_func for load_partial_comp_unit. */
8807 load_partial_comp_unit_reader (const struct die_reader_specs *reader,
8808 const gdb_byte *info_ptr,
8809 struct die_info *comp_unit_die,
8813 struct dwarf2_cu *cu = reader->cu;
8815 prepare_one_comp_unit (cu, comp_unit_die, language_minimal);
8817 /* Check if comp unit has_children.
8818 If so, read the rest of the partial symbols from this comp unit.
8819 If not, there's no more debug_info for this comp unit. */
8821 load_partial_dies (reader, info_ptr, 0);
8824 /* Load the partial DIEs for a secondary CU into memory.
8825 This is also used when rereading a primary CU with load_all_dies. */
8828 load_partial_comp_unit (struct dwarf2_per_cu_data *this_cu)
8830 init_cutu_and_read_dies (this_cu, NULL, 1, 1,
8831 load_partial_comp_unit_reader, NULL);
8835 read_comp_units_from_section (struct objfile *objfile,
8836 struct dwarf2_section_info *section,
8837 struct dwarf2_section_info *abbrev_section,
8838 unsigned int is_dwz,
8841 struct dwarf2_per_cu_data ***all_comp_units)
8843 const gdb_byte *info_ptr;
8845 if (dwarf_read_debug)
8846 fprintf_unfiltered (gdb_stdlog, "Reading %s for %s\n",
8847 get_section_name (section),
8848 get_section_file_name (section));
8850 dwarf2_read_section (objfile, section);
8852 info_ptr = section->buffer;
8854 while (info_ptr < section->buffer + section->size)
8856 struct dwarf2_per_cu_data *this_cu;
8858 sect_offset sect_off = (sect_offset) (info_ptr - section->buffer);
8860 comp_unit_head cu_header;
8861 read_and_check_comp_unit_head (&cu_header, section, abbrev_section,
8862 info_ptr, rcuh_kind::COMPILE);
8864 /* Save the compilation unit for later lookup. */
8865 if (cu_header.unit_type != DW_UT_type)
8867 this_cu = XOBNEW (&objfile->objfile_obstack,
8868 struct dwarf2_per_cu_data);
8869 memset (this_cu, 0, sizeof (*this_cu));
8873 auto sig_type = XOBNEW (&objfile->objfile_obstack,
8874 struct signatured_type);
8875 memset (sig_type, 0, sizeof (*sig_type));
8876 sig_type->signature = cu_header.signature;
8877 sig_type->type_offset_in_tu = cu_header.type_cu_offset_in_tu;
8878 this_cu = &sig_type->per_cu;
8880 this_cu->is_debug_types = (cu_header.unit_type == DW_UT_type);
8881 this_cu->sect_off = sect_off;
8882 this_cu->length = cu_header.length + cu_header.initial_length_size;
8883 this_cu->is_dwz = is_dwz;
8884 this_cu->objfile = objfile;
8885 this_cu->section = section;
8887 if (*n_comp_units == *n_allocated)
8890 *all_comp_units = XRESIZEVEC (struct dwarf2_per_cu_data *,
8891 *all_comp_units, *n_allocated);
8893 (*all_comp_units)[*n_comp_units] = this_cu;
8896 info_ptr = info_ptr + this_cu->length;
8900 /* Create a list of all compilation units in OBJFILE.
8901 This is only done for -readnow and building partial symtabs. */
8904 create_all_comp_units (struct objfile *objfile)
8908 struct dwarf2_per_cu_data **all_comp_units;
8909 struct dwz_file *dwz;
8913 all_comp_units = XNEWVEC (struct dwarf2_per_cu_data *, n_allocated);
8915 read_comp_units_from_section (objfile, &dwarf2_per_objfile->info,
8916 &dwarf2_per_objfile->abbrev, 0,
8917 &n_allocated, &n_comp_units, &all_comp_units);
8919 dwz = dwarf2_get_dwz_file ();
8921 read_comp_units_from_section (objfile, &dwz->info, &dwz->abbrev, 1,
8922 &n_allocated, &n_comp_units,
8925 dwarf2_per_objfile->all_comp_units = XOBNEWVEC (&objfile->objfile_obstack,
8926 struct dwarf2_per_cu_data *,
8928 memcpy (dwarf2_per_objfile->all_comp_units, all_comp_units,
8929 n_comp_units * sizeof (struct dwarf2_per_cu_data *));
8930 xfree (all_comp_units);
8931 dwarf2_per_objfile->n_comp_units = n_comp_units;
8934 /* Process all loaded DIEs for compilation unit CU, starting at
8935 FIRST_DIE. The caller should pass SET_ADDRMAP == 1 if the compilation
8936 unit DIE did not have PC info (DW_AT_low_pc and DW_AT_high_pc, or
8937 DW_AT_ranges). See the comments of add_partial_subprogram on how
8938 SET_ADDRMAP is used and how *LOWPC and *HIGHPC are updated. */
8941 scan_partial_symbols (struct partial_die_info *first_die, CORE_ADDR *lowpc,
8942 CORE_ADDR *highpc, int set_addrmap,
8943 struct dwarf2_cu *cu)
8945 struct partial_die_info *pdi;
8947 /* Now, march along the PDI's, descending into ones which have
8948 interesting children but skipping the children of the other ones,
8949 until we reach the end of the compilation unit. */
8955 fixup_partial_die (pdi, cu);
8957 /* Anonymous namespaces or modules have no name but have interesting
8958 children, so we need to look at them. Ditto for anonymous
8961 if (pdi->name != NULL || pdi->tag == DW_TAG_namespace
8962 || pdi->tag == DW_TAG_module || pdi->tag == DW_TAG_enumeration_type
8963 || pdi->tag == DW_TAG_imported_unit)
8967 case DW_TAG_subprogram:
8968 add_partial_subprogram (pdi, lowpc, highpc, set_addrmap, cu);
8970 case DW_TAG_constant:
8971 case DW_TAG_variable:
8972 case DW_TAG_typedef:
8973 case DW_TAG_union_type:
8974 if (!pdi->is_declaration)
8976 add_partial_symbol (pdi, cu);
8979 case DW_TAG_class_type:
8980 case DW_TAG_interface_type:
8981 case DW_TAG_structure_type:
8982 if (!pdi->is_declaration)
8984 add_partial_symbol (pdi, cu);
8986 if (cu->language == language_rust && pdi->has_children)
8987 scan_partial_symbols (pdi->die_child, lowpc, highpc,
8990 case DW_TAG_enumeration_type:
8991 if (!pdi->is_declaration)
8992 add_partial_enumeration (pdi, cu);
8994 case DW_TAG_base_type:
8995 case DW_TAG_subrange_type:
8996 /* File scope base type definitions are added to the partial
8998 add_partial_symbol (pdi, cu);
9000 case DW_TAG_namespace:
9001 add_partial_namespace (pdi, lowpc, highpc, set_addrmap, cu);
9004 add_partial_module (pdi, lowpc, highpc, set_addrmap, cu);
9006 case DW_TAG_imported_unit:
9008 struct dwarf2_per_cu_data *per_cu;
9010 /* For now we don't handle imported units in type units. */
9011 if (cu->per_cu->is_debug_types)
9013 error (_("Dwarf Error: DW_TAG_imported_unit is not"
9014 " supported in type units [in module %s]"),
9015 objfile_name (cu->objfile));
9018 per_cu = dwarf2_find_containing_comp_unit (pdi->d.sect_off,
9022 /* Go read the partial unit, if needed. */
9023 if (per_cu->v.psymtab == NULL)
9024 process_psymtab_comp_unit (per_cu, 1, cu->language);
9026 VEC_safe_push (dwarf2_per_cu_ptr,
9027 cu->per_cu->imported_symtabs, per_cu);
9030 case DW_TAG_imported_declaration:
9031 add_partial_symbol (pdi, cu);
9038 /* If the die has a sibling, skip to the sibling. */
9040 pdi = pdi->die_sibling;
9044 /* Functions used to compute the fully scoped name of a partial DIE.
9046 Normally, this is simple. For C++, the parent DIE's fully scoped
9047 name is concatenated with "::" and the partial DIE's name.
9048 Enumerators are an exception; they use the scope of their parent
9049 enumeration type, i.e. the name of the enumeration type is not
9050 prepended to the enumerator.
9052 There are two complexities. One is DW_AT_specification; in this
9053 case "parent" means the parent of the target of the specification,
9054 instead of the direct parent of the DIE. The other is compilers
9055 which do not emit DW_TAG_namespace; in this case we try to guess
9056 the fully qualified name of structure types from their members'
9057 linkage names. This must be done using the DIE's children rather
9058 than the children of any DW_AT_specification target. We only need
9059 to do this for structures at the top level, i.e. if the target of
9060 any DW_AT_specification (if any; otherwise the DIE itself) does not
9063 /* Compute the scope prefix associated with PDI's parent, in
9064 compilation unit CU. The result will be allocated on CU's
9065 comp_unit_obstack, or a copy of the already allocated PDI->NAME
9066 field. NULL is returned if no prefix is necessary. */
9068 partial_die_parent_scope (struct partial_die_info *pdi,
9069 struct dwarf2_cu *cu)
9071 const char *grandparent_scope;
9072 struct partial_die_info *parent, *real_pdi;
9074 /* We need to look at our parent DIE; if we have a DW_AT_specification,
9075 then this means the parent of the specification DIE. */
9078 while (real_pdi->has_specification)
9079 real_pdi = find_partial_die (real_pdi->spec_offset,
9080 real_pdi->spec_is_dwz, cu);
9082 parent = real_pdi->die_parent;
9086 if (parent->scope_set)
9087 return parent->scope;
9089 fixup_partial_die (parent, cu);
9091 grandparent_scope = partial_die_parent_scope (parent, cu);
9093 /* GCC 4.0 and 4.1 had a bug (PR c++/28460) where they generated bogus
9094 DW_TAG_namespace DIEs with a name of "::" for the global namespace.
9095 Work around this problem here. */
9096 if (cu->language == language_cplus
9097 && parent->tag == DW_TAG_namespace
9098 && strcmp (parent->name, "::") == 0
9099 && grandparent_scope == NULL)
9101 parent->scope = NULL;
9102 parent->scope_set = 1;
9106 if (pdi->tag == DW_TAG_enumerator)
9107 /* Enumerators should not get the name of the enumeration as a prefix. */
9108 parent->scope = grandparent_scope;
9109 else if (parent->tag == DW_TAG_namespace
9110 || parent->tag == DW_TAG_module
9111 || parent->tag == DW_TAG_structure_type
9112 || parent->tag == DW_TAG_class_type
9113 || parent->tag == DW_TAG_interface_type
9114 || parent->tag == DW_TAG_union_type
9115 || parent->tag == DW_TAG_enumeration_type)
9117 if (grandparent_scope == NULL)
9118 parent->scope = parent->name;
9120 parent->scope = typename_concat (&cu->comp_unit_obstack,
9122 parent->name, 0, cu);
9126 /* FIXME drow/2004-04-01: What should we be doing with
9127 function-local names? For partial symbols, we should probably be
9129 complaint (&symfile_complaints,
9130 _("unhandled containing DIE tag %d for DIE at %d"),
9131 parent->tag, to_underlying (pdi->sect_off));
9132 parent->scope = grandparent_scope;
9135 parent->scope_set = 1;
9136 return parent->scope;
9139 /* Return the fully scoped name associated with PDI, from compilation unit
9140 CU. The result will be allocated with malloc. */
9143 partial_die_full_name (struct partial_die_info *pdi,
9144 struct dwarf2_cu *cu)
9146 const char *parent_scope;
9148 /* If this is a template instantiation, we can not work out the
9149 template arguments from partial DIEs. So, unfortunately, we have
9150 to go through the full DIEs. At least any work we do building
9151 types here will be reused if full symbols are loaded later. */
9152 if (pdi->has_template_arguments)
9154 fixup_partial_die (pdi, cu);
9156 if (pdi->name != NULL && strchr (pdi->name, '<') == NULL)
9158 struct die_info *die;
9159 struct attribute attr;
9160 struct dwarf2_cu *ref_cu = cu;
9162 /* DW_FORM_ref_addr is using section offset. */
9163 attr.name = (enum dwarf_attribute) 0;
9164 attr.form = DW_FORM_ref_addr;
9165 attr.u.unsnd = to_underlying (pdi->sect_off);
9166 die = follow_die_ref (NULL, &attr, &ref_cu);
9168 return xstrdup (dwarf2_full_name (NULL, die, ref_cu));
9172 parent_scope = partial_die_parent_scope (pdi, cu);
9173 if (parent_scope == NULL)
9176 return typename_concat (NULL, parent_scope, pdi->name, 0, cu);
9180 add_partial_symbol (struct partial_die_info *pdi, struct dwarf2_cu *cu)
9182 struct objfile *objfile = cu->objfile;
9183 struct gdbarch *gdbarch = get_objfile_arch (objfile);
9185 const char *actual_name = NULL;
9187 char *built_actual_name;
9189 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
9191 built_actual_name = partial_die_full_name (pdi, cu);
9192 if (built_actual_name != NULL)
9193 actual_name = built_actual_name;
9195 if (actual_name == NULL)
9196 actual_name = pdi->name;
9200 case DW_TAG_subprogram:
9201 addr = gdbarch_adjust_dwarf2_addr (gdbarch, pdi->lowpc + baseaddr);
9202 if (pdi->is_external || cu->language == language_ada)
9204 /* brobecker/2007-12-26: Normally, only "external" DIEs are part
9205 of the global scope. But in Ada, we want to be able to access
9206 nested procedures globally. So all Ada subprograms are stored
9207 in the global scope. */
9208 add_psymbol_to_list (actual_name, strlen (actual_name),
9209 built_actual_name != NULL,
9210 VAR_DOMAIN, LOC_BLOCK,
9211 &objfile->global_psymbols,
9212 addr, cu->language, objfile);
9216 add_psymbol_to_list (actual_name, strlen (actual_name),
9217 built_actual_name != NULL,
9218 VAR_DOMAIN, LOC_BLOCK,
9219 &objfile->static_psymbols,
9220 addr, cu->language, objfile);
9223 if (pdi->main_subprogram && actual_name != NULL)
9224 set_objfile_main_name (objfile, actual_name, cu->language);
9226 case DW_TAG_constant:
9228 std::vector<partial_symbol *> *list;
9230 if (pdi->is_external)
9231 list = &objfile->global_psymbols;
9233 list = &objfile->static_psymbols;
9234 add_psymbol_to_list (actual_name, strlen (actual_name),
9235 built_actual_name != NULL, VAR_DOMAIN, LOC_STATIC,
9236 list, 0, cu->language, objfile);
9239 case DW_TAG_variable:
9241 addr = decode_locdesc (pdi->d.locdesc, cu);
9245 && !dwarf2_per_objfile->has_section_at_zero)
9247 /* A global or static variable may also have been stripped
9248 out by the linker if unused, in which case its address
9249 will be nullified; do not add such variables into partial
9250 symbol table then. */
9252 else if (pdi->is_external)
9255 Don't enter into the minimal symbol tables as there is
9256 a minimal symbol table entry from the ELF symbols already.
9257 Enter into partial symbol table if it has a location
9258 descriptor or a type.
9259 If the location descriptor is missing, new_symbol will create
9260 a LOC_UNRESOLVED symbol, the address of the variable will then
9261 be determined from the minimal symbol table whenever the variable
9263 The address for the partial symbol table entry is not
9264 used by GDB, but it comes in handy for debugging partial symbol
9267 if (pdi->d.locdesc || pdi->has_type)
9268 add_psymbol_to_list (actual_name, strlen (actual_name),
9269 built_actual_name != NULL,
9270 VAR_DOMAIN, LOC_STATIC,
9271 &objfile->global_psymbols,
9273 cu->language, objfile);
9277 int has_loc = pdi->d.locdesc != NULL;
9279 /* Static Variable. Skip symbols whose value we cannot know (those
9280 without location descriptors or constant values). */
9281 if (!has_loc && !pdi->has_const_value)
9283 xfree (built_actual_name);
9287 add_psymbol_to_list (actual_name, strlen (actual_name),
9288 built_actual_name != NULL,
9289 VAR_DOMAIN, LOC_STATIC,
9290 &objfile->static_psymbols,
9291 has_loc ? addr + baseaddr : (CORE_ADDR) 0,
9292 cu->language, objfile);
9295 case DW_TAG_typedef:
9296 case DW_TAG_base_type:
9297 case DW_TAG_subrange_type:
9298 add_psymbol_to_list (actual_name, strlen (actual_name),
9299 built_actual_name != NULL,
9300 VAR_DOMAIN, LOC_TYPEDEF,
9301 &objfile->static_psymbols,
9302 0, cu->language, objfile);
9304 case DW_TAG_imported_declaration:
9305 case DW_TAG_namespace:
9306 add_psymbol_to_list (actual_name, strlen (actual_name),
9307 built_actual_name != NULL,
9308 VAR_DOMAIN, LOC_TYPEDEF,
9309 &objfile->global_psymbols,
9310 0, cu->language, objfile);
9313 add_psymbol_to_list (actual_name, strlen (actual_name),
9314 built_actual_name != NULL,
9315 MODULE_DOMAIN, LOC_TYPEDEF,
9316 &objfile->global_psymbols,
9317 0, cu->language, objfile);
9319 case DW_TAG_class_type:
9320 case DW_TAG_interface_type:
9321 case DW_TAG_structure_type:
9322 case DW_TAG_union_type:
9323 case DW_TAG_enumeration_type:
9324 /* Skip external references. The DWARF standard says in the section
9325 about "Structure, Union, and Class Type Entries": "An incomplete
9326 structure, union or class type is represented by a structure,
9327 union or class entry that does not have a byte size attribute
9328 and that has a DW_AT_declaration attribute." */
9329 if (!pdi->has_byte_size && pdi->is_declaration)
9331 xfree (built_actual_name);
9335 /* NOTE: carlton/2003-10-07: See comment in new_symbol about
9336 static vs. global. */
9337 add_psymbol_to_list (actual_name, strlen (actual_name),
9338 built_actual_name != NULL,
9339 STRUCT_DOMAIN, LOC_TYPEDEF,
9340 cu->language == language_cplus
9341 ? &objfile->global_psymbols
9342 : &objfile->static_psymbols,
9343 0, cu->language, objfile);
9346 case DW_TAG_enumerator:
9347 add_psymbol_to_list (actual_name, strlen (actual_name),
9348 built_actual_name != NULL,
9349 VAR_DOMAIN, LOC_CONST,
9350 cu->language == language_cplus
9351 ? &objfile->global_psymbols
9352 : &objfile->static_psymbols,
9353 0, cu->language, objfile);
9359 xfree (built_actual_name);
9362 /* Read a partial die corresponding to a namespace; also, add a symbol
9363 corresponding to that namespace to the symbol table. NAMESPACE is
9364 the name of the enclosing namespace. */
9367 add_partial_namespace (struct partial_die_info *pdi,
9368 CORE_ADDR *lowpc, CORE_ADDR *highpc,
9369 int set_addrmap, struct dwarf2_cu *cu)
9371 /* Add a symbol for the namespace. */
9373 add_partial_symbol (pdi, cu);
9375 /* Now scan partial symbols in that namespace. */
9377 if (pdi->has_children)
9378 scan_partial_symbols (pdi->die_child, lowpc, highpc, set_addrmap, cu);
9381 /* Read a partial die corresponding to a Fortran module. */
9384 add_partial_module (struct partial_die_info *pdi, CORE_ADDR *lowpc,
9385 CORE_ADDR *highpc, int set_addrmap, struct dwarf2_cu *cu)
9387 /* Add a symbol for the namespace. */
9389 add_partial_symbol (pdi, cu);
9391 /* Now scan partial symbols in that module. */
9393 if (pdi->has_children)
9394 scan_partial_symbols (pdi->die_child, lowpc, highpc, set_addrmap, cu);
9397 /* Read a partial die corresponding to a subprogram and create a partial
9398 symbol for that subprogram. When the CU language allows it, this
9399 routine also defines a partial symbol for each nested subprogram
9400 that this subprogram contains. If SET_ADDRMAP is true, record the
9401 covered ranges in the addrmap. Set *LOWPC and *HIGHPC to the lowest
9402 and highest PC values found in PDI.
9404 PDI may also be a lexical block, in which case we simply search
9405 recursively for subprograms defined inside that lexical block.
9406 Again, this is only performed when the CU language allows this
9407 type of definitions. */
9410 add_partial_subprogram (struct partial_die_info *pdi,
9411 CORE_ADDR *lowpc, CORE_ADDR *highpc,
9412 int set_addrmap, struct dwarf2_cu *cu)
9414 if (pdi->tag == DW_TAG_subprogram)
9416 if (pdi->has_pc_info)
9418 if (pdi->lowpc < *lowpc)
9419 *lowpc = pdi->lowpc;
9420 if (pdi->highpc > *highpc)
9421 *highpc = pdi->highpc;
9424 struct objfile *objfile = cu->objfile;
9425 struct gdbarch *gdbarch = get_objfile_arch (objfile);
9430 baseaddr = ANOFFSET (objfile->section_offsets,
9431 SECT_OFF_TEXT (objfile));
9432 lowpc = gdbarch_adjust_dwarf2_addr (gdbarch,
9433 pdi->lowpc + baseaddr);
9434 highpc = gdbarch_adjust_dwarf2_addr (gdbarch,
9435 pdi->highpc + baseaddr);
9436 addrmap_set_empty (objfile->psymtabs_addrmap, lowpc, highpc - 1,
9437 cu->per_cu->v.psymtab);
9441 if (pdi->has_pc_info || (!pdi->is_external && pdi->may_be_inlined))
9443 if (!pdi->is_declaration)
9444 /* Ignore subprogram DIEs that do not have a name, they are
9445 illegal. Do not emit a complaint at this point, we will
9446 do so when we convert this psymtab into a symtab. */
9448 add_partial_symbol (pdi, cu);
9452 if (! pdi->has_children)
9455 if (cu->language == language_ada)
9457 pdi = pdi->die_child;
9460 fixup_partial_die (pdi, cu);
9461 if (pdi->tag == DW_TAG_subprogram
9462 || pdi->tag == DW_TAG_lexical_block)
9463 add_partial_subprogram (pdi, lowpc, highpc, set_addrmap, cu);
9464 pdi = pdi->die_sibling;
9469 /* Read a partial die corresponding to an enumeration type. */
9472 add_partial_enumeration (struct partial_die_info *enum_pdi,
9473 struct dwarf2_cu *cu)
9475 struct partial_die_info *pdi;
9477 if (enum_pdi->name != NULL)
9478 add_partial_symbol (enum_pdi, cu);
9480 pdi = enum_pdi->die_child;
9483 if (pdi->tag != DW_TAG_enumerator || pdi->name == NULL)
9484 complaint (&symfile_complaints, _("malformed enumerator DIE ignored"));
9486 add_partial_symbol (pdi, cu);
9487 pdi = pdi->die_sibling;
9491 /* Return the initial uleb128 in the die at INFO_PTR. */
9494 peek_abbrev_code (bfd *abfd, const gdb_byte *info_ptr)
9496 unsigned int bytes_read;
9498 return read_unsigned_leb128 (abfd, info_ptr, &bytes_read);
9501 /* Read the initial uleb128 in the die at INFO_PTR in compilation unit CU.
9502 Return the corresponding abbrev, or NULL if the number is zero (indicating
9503 an empty DIE). In either case *BYTES_READ will be set to the length of
9504 the initial number. */
9506 static struct abbrev_info *
9507 peek_die_abbrev (const gdb_byte *info_ptr, unsigned int *bytes_read,
9508 struct dwarf2_cu *cu)
9510 bfd *abfd = cu->objfile->obfd;
9511 unsigned int abbrev_number;
9512 struct abbrev_info *abbrev;
9514 abbrev_number = read_unsigned_leb128 (abfd, info_ptr, bytes_read);
9516 if (abbrev_number == 0)
9519 abbrev = abbrev_table_lookup_abbrev (cu->abbrev_table, abbrev_number);
9522 error (_("Dwarf Error: Could not find abbrev number %d in %s"
9523 " at offset 0x%x [in module %s]"),
9524 abbrev_number, cu->per_cu->is_debug_types ? "TU" : "CU",
9525 to_underlying (cu->header.sect_off), bfd_get_filename (abfd));
9531 /* Scan the debug information for CU starting at INFO_PTR in buffer BUFFER.
9532 Returns a pointer to the end of a series of DIEs, terminated by an empty
9533 DIE. Any children of the skipped DIEs will also be skipped. */
9535 static const gdb_byte *
9536 skip_children (const struct die_reader_specs *reader, const gdb_byte *info_ptr)
9538 struct dwarf2_cu *cu = reader->cu;
9539 struct abbrev_info *abbrev;
9540 unsigned int bytes_read;
9544 abbrev = peek_die_abbrev (info_ptr, &bytes_read, cu);
9546 return info_ptr + bytes_read;
9548 info_ptr = skip_one_die (reader, info_ptr + bytes_read, abbrev);
9552 /* Scan the debug information for CU starting at INFO_PTR in buffer BUFFER.
9553 INFO_PTR should point just after the initial uleb128 of a DIE, and the
9554 abbrev corresponding to that skipped uleb128 should be passed in
9555 ABBREV. Returns a pointer to this DIE's sibling, skipping any
9558 static const gdb_byte *
9559 skip_one_die (const struct die_reader_specs *reader, const gdb_byte *info_ptr,
9560 struct abbrev_info *abbrev)
9562 unsigned int bytes_read;
9563 struct attribute attr;
9564 bfd *abfd = reader->abfd;
9565 struct dwarf2_cu *cu = reader->cu;
9566 const gdb_byte *buffer = reader->buffer;
9567 const gdb_byte *buffer_end = reader->buffer_end;
9568 unsigned int form, i;
9570 for (i = 0; i < abbrev->num_attrs; i++)
9572 /* The only abbrev we care about is DW_AT_sibling. */
9573 if (abbrev->attrs[i].name == DW_AT_sibling)
9575 read_attribute (reader, &attr, &abbrev->attrs[i], info_ptr);
9576 if (attr.form == DW_FORM_ref_addr)
9577 complaint (&symfile_complaints,
9578 _("ignoring absolute DW_AT_sibling"));
9581 sect_offset off = dwarf2_get_ref_die_offset (&attr);
9582 const gdb_byte *sibling_ptr = buffer + to_underlying (off);
9584 if (sibling_ptr < info_ptr)
9585 complaint (&symfile_complaints,
9586 _("DW_AT_sibling points backwards"));
9587 else if (sibling_ptr > reader->buffer_end)
9588 dwarf2_section_buffer_overflow_complaint (reader->die_section);
9594 /* If it isn't DW_AT_sibling, skip this attribute. */
9595 form = abbrev->attrs[i].form;
9599 case DW_FORM_ref_addr:
9600 /* In DWARF 2, DW_FORM_ref_addr is address sized; in DWARF 3
9601 and later it is offset sized. */
9602 if (cu->header.version == 2)
9603 info_ptr += cu->header.addr_size;
9605 info_ptr += cu->header.offset_size;
9607 case DW_FORM_GNU_ref_alt:
9608 info_ptr += cu->header.offset_size;
9611 info_ptr += cu->header.addr_size;
9618 case DW_FORM_flag_present:
9619 case DW_FORM_implicit_const:
9631 case DW_FORM_ref_sig8:
9634 case DW_FORM_data16:
9637 case DW_FORM_string:
9638 read_direct_string (abfd, info_ptr, &bytes_read);
9639 info_ptr += bytes_read;
9641 case DW_FORM_sec_offset:
9643 case DW_FORM_GNU_strp_alt:
9644 info_ptr += cu->header.offset_size;
9646 case DW_FORM_exprloc:
9648 info_ptr += read_unsigned_leb128 (abfd, info_ptr, &bytes_read);
9649 info_ptr += bytes_read;
9651 case DW_FORM_block1:
9652 info_ptr += 1 + read_1_byte (abfd, info_ptr);
9654 case DW_FORM_block2:
9655 info_ptr += 2 + read_2_bytes (abfd, info_ptr);
9657 case DW_FORM_block4:
9658 info_ptr += 4 + read_4_bytes (abfd, info_ptr);
9662 case DW_FORM_ref_udata:
9663 case DW_FORM_GNU_addr_index:
9664 case DW_FORM_GNU_str_index:
9665 info_ptr = safe_skip_leb128 (info_ptr, buffer_end);
9667 case DW_FORM_indirect:
9668 form = read_unsigned_leb128 (abfd, info_ptr, &bytes_read);
9669 info_ptr += bytes_read;
9670 /* We need to continue parsing from here, so just go back to
9672 goto skip_attribute;
9675 error (_("Dwarf Error: Cannot handle %s "
9676 "in DWARF reader [in module %s]"),
9677 dwarf_form_name (form),
9678 bfd_get_filename (abfd));
9682 if (abbrev->has_children)
9683 return skip_children (reader, info_ptr);
9688 /* Locate ORIG_PDI's sibling.
9689 INFO_PTR should point to the start of the next DIE after ORIG_PDI. */
9691 static const gdb_byte *
9692 locate_pdi_sibling (const struct die_reader_specs *reader,
9693 struct partial_die_info *orig_pdi,
9694 const gdb_byte *info_ptr)
9696 /* Do we know the sibling already? */
9698 if (orig_pdi->sibling)
9699 return orig_pdi->sibling;
9701 /* Are there any children to deal with? */
9703 if (!orig_pdi->has_children)
9706 /* Skip the children the long way. */
9708 return skip_children (reader, info_ptr);
9711 /* Expand this partial symbol table into a full symbol table. SELF is
9715 dwarf2_read_symtab (struct partial_symtab *self,
9716 struct objfile *objfile)
9720 warning (_("bug: psymtab for %s is already read in."),
9727 printf_filtered (_("Reading in symbols for %s..."),
9729 gdb_flush (gdb_stdout);
9732 /* Restore our global data. */
9734 = (struct dwarf2_per_objfile *) objfile_data (objfile,
9735 dwarf2_objfile_data_key);
9737 /* If this psymtab is constructed from a debug-only objfile, the
9738 has_section_at_zero flag will not necessarily be correct. We
9739 can get the correct value for this flag by looking at the data
9740 associated with the (presumably stripped) associated objfile. */
9741 if (objfile->separate_debug_objfile_backlink)
9743 struct dwarf2_per_objfile *dpo_backlink
9744 = ((struct dwarf2_per_objfile *)
9745 objfile_data (objfile->separate_debug_objfile_backlink,
9746 dwarf2_objfile_data_key));
9748 dwarf2_per_objfile->has_section_at_zero
9749 = dpo_backlink->has_section_at_zero;
9752 dwarf2_per_objfile->reading_partial_symbols = 0;
9754 psymtab_to_symtab_1 (self);
9756 /* Finish up the debug error message. */
9758 printf_filtered (_("done.\n"));
9761 process_cu_includes ();
9764 /* Reading in full CUs. */
9766 /* Add PER_CU to the queue. */
9769 queue_comp_unit (struct dwarf2_per_cu_data *per_cu,
9770 enum language pretend_language)
9772 struct dwarf2_queue_item *item;
9775 item = XNEW (struct dwarf2_queue_item);
9776 item->per_cu = per_cu;
9777 item->pretend_language = pretend_language;
9780 if (dwarf2_queue == NULL)
9781 dwarf2_queue = item;
9783 dwarf2_queue_tail->next = item;
9785 dwarf2_queue_tail = item;
9788 /* If PER_CU is not yet queued, add it to the queue.
9789 If DEPENDENT_CU is non-NULL, it has a reference to PER_CU so add a
9791 The result is non-zero if PER_CU was queued, otherwise the result is zero
9792 meaning either PER_CU is already queued or it is already loaded.
9794 N.B. There is an invariant here that if a CU is queued then it is loaded.
9795 The caller is required to load PER_CU if we return non-zero. */
9798 maybe_queue_comp_unit (struct dwarf2_cu *dependent_cu,
9799 struct dwarf2_per_cu_data *per_cu,
9800 enum language pretend_language)
9802 /* We may arrive here during partial symbol reading, if we need full
9803 DIEs to process an unusual case (e.g. template arguments). Do
9804 not queue PER_CU, just tell our caller to load its DIEs. */
9805 if (dwarf2_per_objfile->reading_partial_symbols)
9807 if (per_cu->cu == NULL || per_cu->cu->dies == NULL)
9812 /* Mark the dependence relation so that we don't flush PER_CU
9814 if (dependent_cu != NULL)
9815 dwarf2_add_dependence (dependent_cu, per_cu);
9817 /* If it's already on the queue, we have nothing to do. */
9821 /* If the compilation unit is already loaded, just mark it as
9823 if (per_cu->cu != NULL)
9825 per_cu->cu->last_used = 0;
9829 /* Add it to the queue. */
9830 queue_comp_unit (per_cu, pretend_language);
9835 /* Process the queue. */
9838 process_queue (void)
9840 struct dwarf2_queue_item *item, *next_item;
9842 if (dwarf_read_debug)
9844 fprintf_unfiltered (gdb_stdlog,
9845 "Expanding one or more symtabs of objfile %s ...\n",
9846 objfile_name (dwarf2_per_objfile->objfile));
9849 /* The queue starts out with one item, but following a DIE reference
9850 may load a new CU, adding it to the end of the queue. */
9851 for (item = dwarf2_queue; item != NULL; dwarf2_queue = item = next_item)
9853 if ((dwarf2_per_objfile->using_index
9854 ? !item->per_cu->v.quick->compunit_symtab
9855 : (item->per_cu->v.psymtab && !item->per_cu->v.psymtab->readin))
9856 /* Skip dummy CUs. */
9857 && item->per_cu->cu != NULL)
9859 struct dwarf2_per_cu_data *per_cu = item->per_cu;
9860 unsigned int debug_print_threshold;
9863 if (per_cu->is_debug_types)
9865 struct signatured_type *sig_type =
9866 (struct signatured_type *) per_cu;
9868 sprintf (buf, "TU %s at offset 0x%x",
9869 hex_string (sig_type->signature),
9870 to_underlying (per_cu->sect_off));
9871 /* There can be 100s of TUs.
9872 Only print them in verbose mode. */
9873 debug_print_threshold = 2;
9877 sprintf (buf, "CU at offset 0x%x",
9878 to_underlying (per_cu->sect_off));
9879 debug_print_threshold = 1;
9882 if (dwarf_read_debug >= debug_print_threshold)
9883 fprintf_unfiltered (gdb_stdlog, "Expanding symtab of %s\n", buf);
9885 if (per_cu->is_debug_types)
9886 process_full_type_unit (per_cu, item->pretend_language);
9888 process_full_comp_unit (per_cu, item->pretend_language);
9890 if (dwarf_read_debug >= debug_print_threshold)
9891 fprintf_unfiltered (gdb_stdlog, "Done expanding %s\n", buf);
9894 item->per_cu->queued = 0;
9895 next_item = item->next;
9899 dwarf2_queue_tail = NULL;
9901 if (dwarf_read_debug)
9903 fprintf_unfiltered (gdb_stdlog, "Done expanding symtabs of %s.\n",
9904 objfile_name (dwarf2_per_objfile->objfile));
9908 /* Free all allocated queue entries. This function only releases anything if
9909 an error was thrown; if the queue was processed then it would have been
9910 freed as we went along. */
9913 dwarf2_release_queue (void *dummy)
9915 struct dwarf2_queue_item *item, *last;
9917 item = dwarf2_queue;
9920 /* Anything still marked queued is likely to be in an
9921 inconsistent state, so discard it. */
9922 if (item->per_cu->queued)
9924 if (item->per_cu->cu != NULL)
9925 free_one_cached_comp_unit (item->per_cu);
9926 item->per_cu->queued = 0;
9934 dwarf2_queue = dwarf2_queue_tail = NULL;
9937 /* Read in full symbols for PST, and anything it depends on. */
9940 psymtab_to_symtab_1 (struct partial_symtab *pst)
9942 struct dwarf2_per_cu_data *per_cu;
9948 for (i = 0; i < pst->number_of_dependencies; i++)
9949 if (!pst->dependencies[i]->readin
9950 && pst->dependencies[i]->user == NULL)
9952 /* Inform about additional files that need to be read in. */
9955 /* FIXME: i18n: Need to make this a single string. */
9956 fputs_filtered (" ", gdb_stdout);
9958 fputs_filtered ("and ", gdb_stdout);
9960 printf_filtered ("%s...", pst->dependencies[i]->filename);
9961 wrap_here (""); /* Flush output. */
9962 gdb_flush (gdb_stdout);
9964 psymtab_to_symtab_1 (pst->dependencies[i]);
9967 per_cu = (struct dwarf2_per_cu_data *) pst->read_symtab_private;
9971 /* It's an include file, no symbols to read for it.
9972 Everything is in the parent symtab. */
9977 dw2_do_instantiate_symtab (per_cu);
9980 /* Trivial hash function for die_info: the hash value of a DIE
9981 is its offset in .debug_info for this objfile. */
9984 die_hash (const void *item)
9986 const struct die_info *die = (const struct die_info *) item;
9988 return to_underlying (die->sect_off);
9991 /* Trivial comparison function for die_info structures: two DIEs
9992 are equal if they have the same offset. */
9995 die_eq (const void *item_lhs, const void *item_rhs)
9997 const struct die_info *die_lhs = (const struct die_info *) item_lhs;
9998 const struct die_info *die_rhs = (const struct die_info *) item_rhs;
10000 return die_lhs->sect_off == die_rhs->sect_off;
10003 /* die_reader_func for load_full_comp_unit.
10004 This is identical to read_signatured_type_reader,
10005 but is kept separate for now. */
10008 load_full_comp_unit_reader (const struct die_reader_specs *reader,
10009 const gdb_byte *info_ptr,
10010 struct die_info *comp_unit_die,
10014 struct dwarf2_cu *cu = reader->cu;
10015 enum language *language_ptr = (enum language *) data;
10017 gdb_assert (cu->die_hash == NULL);
10019 htab_create_alloc_ex (cu->header.length / 12,
10023 &cu->comp_unit_obstack,
10024 hashtab_obstack_allocate,
10025 dummy_obstack_deallocate);
10028 comp_unit_die->child = read_die_and_siblings (reader, info_ptr,
10029 &info_ptr, comp_unit_die);
10030 cu->dies = comp_unit_die;
10031 /* comp_unit_die is not stored in die_hash, no need. */
10033 /* We try not to read any attributes in this function, because not
10034 all CUs needed for references have been loaded yet, and symbol
10035 table processing isn't initialized. But we have to set the CU language,
10036 or we won't be able to build types correctly.
10037 Similarly, if we do not read the producer, we can not apply
10038 producer-specific interpretation. */
10039 prepare_one_comp_unit (cu, cu->dies, *language_ptr);
10042 /* Load the DIEs associated with PER_CU into memory. */
10045 load_full_comp_unit (struct dwarf2_per_cu_data *this_cu,
10046 enum language pretend_language)
10048 gdb_assert (! this_cu->is_debug_types);
10050 init_cutu_and_read_dies (this_cu, NULL, 1, 1,
10051 load_full_comp_unit_reader, &pretend_language);
10054 /* Add a DIE to the delayed physname list. */
10057 add_to_method_list (struct type *type, int fnfield_index, int index,
10058 const char *name, struct die_info *die,
10059 struct dwarf2_cu *cu)
10061 struct delayed_method_info mi;
10063 mi.fnfield_index = fnfield_index;
10067 VEC_safe_push (delayed_method_info, cu->method_list, &mi);
10070 /* A cleanup for freeing the delayed method list. */
10073 free_delayed_list (void *ptr)
10075 struct dwarf2_cu *cu = (struct dwarf2_cu *) ptr;
10076 if (cu->method_list != NULL)
10078 VEC_free (delayed_method_info, cu->method_list);
10079 cu->method_list = NULL;
10083 /* Check whether [PHYSNAME, PHYSNAME+LEN) ends with a modifier like
10084 "const" / "volatile". If so, decrements LEN by the length of the
10085 modifier and return true. Otherwise return false. */
10089 check_modifier (const char *physname, size_t &len, const char (&mod)[N])
10091 size_t mod_len = sizeof (mod) - 1;
10092 if (len > mod_len && startswith (physname + (len - mod_len), mod))
10100 /* Compute the physnames of any methods on the CU's method list.
10102 The computation of method physnames is delayed in order to avoid the
10103 (bad) condition that one of the method's formal parameters is of an as yet
10104 incomplete type. */
10107 compute_delayed_physnames (struct dwarf2_cu *cu)
10110 struct delayed_method_info *mi;
10112 /* Only C++ delays computing physnames. */
10113 if (VEC_empty (delayed_method_info, cu->method_list))
10115 gdb_assert (cu->language == language_cplus);
10117 for (i = 0; VEC_iterate (delayed_method_info, cu->method_list, i, mi) ; ++i)
10119 const char *physname;
10120 struct fn_fieldlist *fn_flp
10121 = &TYPE_FN_FIELDLIST (mi->type, mi->fnfield_index);
10122 physname = dwarf2_physname (mi->name, mi->die, cu);
10123 TYPE_FN_FIELD_PHYSNAME (fn_flp->fn_fields, mi->index)
10124 = physname ? physname : "";
10126 /* Since there's no tag to indicate whether a method is a
10127 const/volatile overload, extract that information out of the
10129 if (physname != NULL)
10131 size_t len = strlen (physname);
10135 if (physname[len] == ')') /* shortcut */
10137 else if (check_modifier (physname, len, " const"))
10138 TYPE_FN_FIELD_CONST (fn_flp->fn_fields, mi->index) = 1;
10139 else if (check_modifier (physname, len, " volatile"))
10140 TYPE_FN_FIELD_VOLATILE (fn_flp->fn_fields, mi->index) = 1;
10148 /* Go objects should be embedded in a DW_TAG_module DIE,
10149 and it's not clear if/how imported objects will appear.
10150 To keep Go support simple until that's worked out,
10151 go back through what we've read and create something usable.
10152 We could do this while processing each DIE, and feels kinda cleaner,
10153 but that way is more invasive.
10154 This is to, for example, allow the user to type "p var" or "b main"
10155 without having to specify the package name, and allow lookups
10156 of module.object to work in contexts that use the expression
10160 fixup_go_packaging (struct dwarf2_cu *cu)
10162 char *package_name = NULL;
10163 struct pending *list;
10166 for (list = global_symbols; list != NULL; list = list->next)
10168 for (i = 0; i < list->nsyms; ++i)
10170 struct symbol *sym = list->symbol[i];
10172 if (SYMBOL_LANGUAGE (sym) == language_go
10173 && SYMBOL_CLASS (sym) == LOC_BLOCK)
10175 char *this_package_name = go_symbol_package_name (sym);
10177 if (this_package_name == NULL)
10179 if (package_name == NULL)
10180 package_name = this_package_name;
10183 if (strcmp (package_name, this_package_name) != 0)
10184 complaint (&symfile_complaints,
10185 _("Symtab %s has objects from two different Go packages: %s and %s"),
10186 (symbol_symtab (sym) != NULL
10187 ? symtab_to_filename_for_display
10188 (symbol_symtab (sym))
10189 : objfile_name (cu->objfile)),
10190 this_package_name, package_name);
10191 xfree (this_package_name);
10197 if (package_name != NULL)
10199 struct objfile *objfile = cu->objfile;
10200 const char *saved_package_name
10201 = (const char *) obstack_copy0 (&objfile->per_bfd->storage_obstack,
10203 strlen (package_name));
10204 struct type *type = init_type (objfile, TYPE_CODE_MODULE, 0,
10205 saved_package_name);
10206 struct symbol *sym;
10208 TYPE_TAG_NAME (type) = TYPE_NAME (type);
10210 sym = allocate_symbol (objfile);
10211 SYMBOL_SET_LANGUAGE (sym, language_go, &objfile->objfile_obstack);
10212 SYMBOL_SET_NAMES (sym, saved_package_name,
10213 strlen (saved_package_name), 0, objfile);
10214 /* This is not VAR_DOMAIN because we want a way to ensure a lookup of,
10215 e.g., "main" finds the "main" module and not C's main(). */
10216 SYMBOL_DOMAIN (sym) = STRUCT_DOMAIN;
10217 SYMBOL_ACLASS_INDEX (sym) = LOC_TYPEDEF;
10218 SYMBOL_TYPE (sym) = type;
10220 add_symbol_to_list (sym, &global_symbols);
10222 xfree (package_name);
10226 /* Return the symtab for PER_CU. This works properly regardless of
10227 whether we're using the index or psymtabs. */
10229 static struct compunit_symtab *
10230 get_compunit_symtab (struct dwarf2_per_cu_data *per_cu)
10232 return (dwarf2_per_objfile->using_index
10233 ? per_cu->v.quick->compunit_symtab
10234 : per_cu->v.psymtab->compunit_symtab);
10237 /* A helper function for computing the list of all symbol tables
10238 included by PER_CU. */
10241 recursively_compute_inclusions (VEC (compunit_symtab_ptr) **result,
10242 htab_t all_children, htab_t all_type_symtabs,
10243 struct dwarf2_per_cu_data *per_cu,
10244 struct compunit_symtab *immediate_parent)
10248 struct compunit_symtab *cust;
10249 struct dwarf2_per_cu_data *iter;
10251 slot = htab_find_slot (all_children, per_cu, INSERT);
10254 /* This inclusion and its children have been processed. */
10259 /* Only add a CU if it has a symbol table. */
10260 cust = get_compunit_symtab (per_cu);
10263 /* If this is a type unit only add its symbol table if we haven't
10264 seen it yet (type unit per_cu's can share symtabs). */
10265 if (per_cu->is_debug_types)
10267 slot = htab_find_slot (all_type_symtabs, cust, INSERT);
10271 VEC_safe_push (compunit_symtab_ptr, *result, cust);
10272 if (cust->user == NULL)
10273 cust->user = immediate_parent;
10278 VEC_safe_push (compunit_symtab_ptr, *result, cust);
10279 if (cust->user == NULL)
10280 cust->user = immediate_parent;
10285 VEC_iterate (dwarf2_per_cu_ptr, per_cu->imported_symtabs, ix, iter);
10288 recursively_compute_inclusions (result, all_children,
10289 all_type_symtabs, iter, cust);
10293 /* Compute the compunit_symtab 'includes' fields for the compunit_symtab of
10297 compute_compunit_symtab_includes (struct dwarf2_per_cu_data *per_cu)
10299 gdb_assert (! per_cu->is_debug_types);
10301 if (!VEC_empty (dwarf2_per_cu_ptr, per_cu->imported_symtabs))
10304 struct dwarf2_per_cu_data *per_cu_iter;
10305 struct compunit_symtab *compunit_symtab_iter;
10306 VEC (compunit_symtab_ptr) *result_symtabs = NULL;
10307 htab_t all_children, all_type_symtabs;
10308 struct compunit_symtab *cust = get_compunit_symtab (per_cu);
10310 /* If we don't have a symtab, we can just skip this case. */
10314 all_children = htab_create_alloc (1, htab_hash_pointer, htab_eq_pointer,
10315 NULL, xcalloc, xfree);
10316 all_type_symtabs = htab_create_alloc (1, htab_hash_pointer, htab_eq_pointer,
10317 NULL, xcalloc, xfree);
10320 VEC_iterate (dwarf2_per_cu_ptr, per_cu->imported_symtabs,
10324 recursively_compute_inclusions (&result_symtabs, all_children,
10325 all_type_symtabs, per_cu_iter,
10329 /* Now we have a transitive closure of all the included symtabs. */
10330 len = VEC_length (compunit_symtab_ptr, result_symtabs);
10332 = XOBNEWVEC (&dwarf2_per_objfile->objfile->objfile_obstack,
10333 struct compunit_symtab *, len + 1);
10335 VEC_iterate (compunit_symtab_ptr, result_symtabs, ix,
10336 compunit_symtab_iter);
10338 cust->includes[ix] = compunit_symtab_iter;
10339 cust->includes[len] = NULL;
10341 VEC_free (compunit_symtab_ptr, result_symtabs);
10342 htab_delete (all_children);
10343 htab_delete (all_type_symtabs);
10347 /* Compute the 'includes' field for the symtabs of all the CUs we just
10351 process_cu_includes (void)
10354 struct dwarf2_per_cu_data *iter;
10357 VEC_iterate (dwarf2_per_cu_ptr, dwarf2_per_objfile->just_read_cus,
10361 if (! iter->is_debug_types)
10362 compute_compunit_symtab_includes (iter);
10365 VEC_free (dwarf2_per_cu_ptr, dwarf2_per_objfile->just_read_cus);
10368 /* Generate full symbol information for PER_CU, whose DIEs have
10369 already been loaded into memory. */
10372 process_full_comp_unit (struct dwarf2_per_cu_data *per_cu,
10373 enum language pretend_language)
10375 struct dwarf2_cu *cu = per_cu->cu;
10376 struct objfile *objfile = per_cu->objfile;
10377 struct gdbarch *gdbarch = get_objfile_arch (objfile);
10378 CORE_ADDR lowpc, highpc;
10379 struct compunit_symtab *cust;
10380 struct cleanup *delayed_list_cleanup;
10381 CORE_ADDR baseaddr;
10382 struct block *static_block;
10385 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
10388 scoped_free_pendings free_pending;
10389 delayed_list_cleanup = make_cleanup (free_delayed_list, cu);
10391 cu->list_in_scope = &file_symbols;
10393 cu->language = pretend_language;
10394 cu->language_defn = language_def (cu->language);
10396 /* Do line number decoding in read_file_scope () */
10397 process_die (cu->dies, cu);
10399 /* For now fudge the Go package. */
10400 if (cu->language == language_go)
10401 fixup_go_packaging (cu);
10403 /* Now that we have processed all the DIEs in the CU, all the types
10404 should be complete, and it should now be safe to compute all of the
10406 compute_delayed_physnames (cu);
10407 do_cleanups (delayed_list_cleanup);
10409 /* Some compilers don't define a DW_AT_high_pc attribute for the
10410 compilation unit. If the DW_AT_high_pc is missing, synthesize
10411 it, by scanning the DIE's below the compilation unit. */
10412 get_scope_pc_bounds (cu->dies, &lowpc, &highpc, cu);
10414 addr = gdbarch_adjust_dwarf2_addr (gdbarch, highpc + baseaddr);
10415 static_block = end_symtab_get_static_block (addr, 0, 1);
10417 /* If the comp unit has DW_AT_ranges, it may have discontiguous ranges.
10418 Also, DW_AT_ranges may record ranges not belonging to any child DIEs
10419 (such as virtual method tables). Record the ranges in STATIC_BLOCK's
10420 addrmap to help ensure it has an accurate map of pc values belonging to
10422 dwarf2_record_block_ranges (cu->dies, static_block, baseaddr, cu);
10424 cust = end_symtab_from_static_block (static_block,
10425 SECT_OFF_TEXT (objfile), 0);
10429 int gcc_4_minor = producer_is_gcc_ge_4 (cu->producer);
10431 /* Set symtab language to language from DW_AT_language. If the
10432 compilation is from a C file generated by language preprocessors, do
10433 not set the language if it was already deduced by start_subfile. */
10434 if (!(cu->language == language_c
10435 && COMPUNIT_FILETABS (cust)->language != language_unknown))
10436 COMPUNIT_FILETABS (cust)->language = cu->language;
10438 /* GCC-4.0 has started to support -fvar-tracking. GCC-3.x still can
10439 produce DW_AT_location with location lists but it can be possibly
10440 invalid without -fvar-tracking. Still up to GCC-4.4.x incl. 4.4.0
10441 there were bugs in prologue debug info, fixed later in GCC-4.5
10442 by "unwind info for epilogues" patch (which is not directly related).
10444 For -gdwarf-4 type units LOCATIONS_VALID indication is fortunately not
10445 needed, it would be wrong due to missing DW_AT_producer there.
10447 Still one can confuse GDB by using non-standard GCC compilation
10448 options - this waits on GCC PR other/32998 (-frecord-gcc-switches).
10450 if (cu->has_loclist && gcc_4_minor >= 5)
10451 cust->locations_valid = 1;
10453 if (gcc_4_minor >= 5)
10454 cust->epilogue_unwind_valid = 1;
10456 cust->call_site_htab = cu->call_site_htab;
10459 if (dwarf2_per_objfile->using_index)
10460 per_cu->v.quick->compunit_symtab = cust;
10463 struct partial_symtab *pst = per_cu->v.psymtab;
10464 pst->compunit_symtab = cust;
10468 /* Push it for inclusion processing later. */
10469 VEC_safe_push (dwarf2_per_cu_ptr, dwarf2_per_objfile->just_read_cus, per_cu);
10472 /* Generate full symbol information for type unit PER_CU, whose DIEs have
10473 already been loaded into memory. */
10476 process_full_type_unit (struct dwarf2_per_cu_data *per_cu,
10477 enum language pretend_language)
10479 struct dwarf2_cu *cu = per_cu->cu;
10480 struct objfile *objfile = per_cu->objfile;
10481 struct compunit_symtab *cust;
10482 struct cleanup *delayed_list_cleanup;
10483 struct signatured_type *sig_type;
10485 gdb_assert (per_cu->is_debug_types);
10486 sig_type = (struct signatured_type *) per_cu;
10489 scoped_free_pendings free_pending;
10490 delayed_list_cleanup = make_cleanup (free_delayed_list, cu);
10492 cu->list_in_scope = &file_symbols;
10494 cu->language = pretend_language;
10495 cu->language_defn = language_def (cu->language);
10497 /* The symbol tables are set up in read_type_unit_scope. */
10498 process_die (cu->dies, cu);
10500 /* For now fudge the Go package. */
10501 if (cu->language == language_go)
10502 fixup_go_packaging (cu);
10504 /* Now that we have processed all the DIEs in the CU, all the types
10505 should be complete, and it should now be safe to compute all of the
10507 compute_delayed_physnames (cu);
10508 do_cleanups (delayed_list_cleanup);
10510 /* TUs share symbol tables.
10511 If this is the first TU to use this symtab, complete the construction
10512 of it with end_expandable_symtab. Otherwise, complete the addition of
10513 this TU's symbols to the existing symtab. */
10514 if (sig_type->type_unit_group->compunit_symtab == NULL)
10516 cust = end_expandable_symtab (0, SECT_OFF_TEXT (objfile));
10517 sig_type->type_unit_group->compunit_symtab = cust;
10521 /* Set symtab language to language from DW_AT_language. If the
10522 compilation is from a C file generated by language preprocessors,
10523 do not set the language if it was already deduced by
10525 if (!(cu->language == language_c
10526 && COMPUNIT_FILETABS (cust)->language != language_c))
10527 COMPUNIT_FILETABS (cust)->language = cu->language;
10532 augment_type_symtab ();
10533 cust = sig_type->type_unit_group->compunit_symtab;
10536 if (dwarf2_per_objfile->using_index)
10537 per_cu->v.quick->compunit_symtab = cust;
10540 struct partial_symtab *pst = per_cu->v.psymtab;
10541 pst->compunit_symtab = cust;
10546 /* Process an imported unit DIE. */
10549 process_imported_unit_die (struct die_info *die, struct dwarf2_cu *cu)
10551 struct attribute *attr;
10553 /* For now we don't handle imported units in type units. */
10554 if (cu->per_cu->is_debug_types)
10556 error (_("Dwarf Error: DW_TAG_imported_unit is not"
10557 " supported in type units [in module %s]"),
10558 objfile_name (cu->objfile));
10561 attr = dwarf2_attr (die, DW_AT_import, cu);
10564 sect_offset sect_off = dwarf2_get_ref_die_offset (attr);
10565 bool is_dwz = (attr->form == DW_FORM_GNU_ref_alt || cu->per_cu->is_dwz);
10566 dwarf2_per_cu_data *per_cu
10567 = dwarf2_find_containing_comp_unit (sect_off, is_dwz, cu->objfile);
10569 /* If necessary, add it to the queue and load its DIEs. */
10570 if (maybe_queue_comp_unit (cu, per_cu, cu->language))
10571 load_full_comp_unit (per_cu, cu->language);
10573 VEC_safe_push (dwarf2_per_cu_ptr, cu->per_cu->imported_symtabs,
10578 /* RAII object that represents a process_die scope: i.e.,
10579 starts/finishes processing a DIE. */
10580 class process_die_scope
10583 process_die_scope (die_info *die, dwarf2_cu *cu)
10584 : m_die (die), m_cu (cu)
10586 /* We should only be processing DIEs not already in process. */
10587 gdb_assert (!m_die->in_process);
10588 m_die->in_process = true;
10591 ~process_die_scope ()
10593 m_die->in_process = false;
10595 /* If we're done processing the DIE for the CU that owns the line
10596 header, we don't need the line header anymore. */
10597 if (m_cu->line_header_die_owner == m_die)
10599 delete m_cu->line_header;
10600 m_cu->line_header = NULL;
10601 m_cu->line_header_die_owner = NULL;
10610 /* Process a die and its children. */
10613 process_die (struct die_info *die, struct dwarf2_cu *cu)
10615 process_die_scope scope (die, cu);
10619 case DW_TAG_padding:
10621 case DW_TAG_compile_unit:
10622 case DW_TAG_partial_unit:
10623 read_file_scope (die, cu);
10625 case DW_TAG_type_unit:
10626 read_type_unit_scope (die, cu);
10628 case DW_TAG_subprogram:
10629 case DW_TAG_inlined_subroutine:
10630 read_func_scope (die, cu);
10632 case DW_TAG_lexical_block:
10633 case DW_TAG_try_block:
10634 case DW_TAG_catch_block:
10635 read_lexical_block_scope (die, cu);
10637 case DW_TAG_call_site:
10638 case DW_TAG_GNU_call_site:
10639 read_call_site_scope (die, cu);
10641 case DW_TAG_class_type:
10642 case DW_TAG_interface_type:
10643 case DW_TAG_structure_type:
10644 case DW_TAG_union_type:
10645 process_structure_scope (die, cu);
10647 case DW_TAG_enumeration_type:
10648 process_enumeration_scope (die, cu);
10651 /* These dies have a type, but processing them does not create
10652 a symbol or recurse to process the children. Therefore we can
10653 read them on-demand through read_type_die. */
10654 case DW_TAG_subroutine_type:
10655 case DW_TAG_set_type:
10656 case DW_TAG_array_type:
10657 case DW_TAG_pointer_type:
10658 case DW_TAG_ptr_to_member_type:
10659 case DW_TAG_reference_type:
10660 case DW_TAG_rvalue_reference_type:
10661 case DW_TAG_string_type:
10664 case DW_TAG_base_type:
10665 case DW_TAG_subrange_type:
10666 case DW_TAG_typedef:
10667 /* Add a typedef symbol for the type definition, if it has a
10669 new_symbol (die, read_type_die (die, cu), cu);
10671 case DW_TAG_common_block:
10672 read_common_block (die, cu);
10674 case DW_TAG_common_inclusion:
10676 case DW_TAG_namespace:
10677 cu->processing_has_namespace_info = 1;
10678 read_namespace (die, cu);
10680 case DW_TAG_module:
10681 cu->processing_has_namespace_info = 1;
10682 read_module (die, cu);
10684 case DW_TAG_imported_declaration:
10685 cu->processing_has_namespace_info = 1;
10686 if (read_namespace_alias (die, cu))
10688 /* The declaration is not a global namespace alias: fall through. */
10689 case DW_TAG_imported_module:
10690 cu->processing_has_namespace_info = 1;
10691 if (die->child != NULL && (die->tag == DW_TAG_imported_declaration
10692 || cu->language != language_fortran))
10693 complaint (&symfile_complaints, _("Tag '%s' has unexpected children"),
10694 dwarf_tag_name (die->tag));
10695 read_import_statement (die, cu);
10698 case DW_TAG_imported_unit:
10699 process_imported_unit_die (die, cu);
10702 case DW_TAG_variable:
10703 read_variable (die, cu);
10707 new_symbol (die, NULL, cu);
10712 /* DWARF name computation. */
10714 /* A helper function for dwarf2_compute_name which determines whether DIE
10715 needs to have the name of the scope prepended to the name listed in the
10719 die_needs_namespace (struct die_info *die, struct dwarf2_cu *cu)
10721 struct attribute *attr;
10725 case DW_TAG_namespace:
10726 case DW_TAG_typedef:
10727 case DW_TAG_class_type:
10728 case DW_TAG_interface_type:
10729 case DW_TAG_structure_type:
10730 case DW_TAG_union_type:
10731 case DW_TAG_enumeration_type:
10732 case DW_TAG_enumerator:
10733 case DW_TAG_subprogram:
10734 case DW_TAG_inlined_subroutine:
10735 case DW_TAG_member:
10736 case DW_TAG_imported_declaration:
10739 case DW_TAG_variable:
10740 case DW_TAG_constant:
10741 /* We only need to prefix "globally" visible variables. These include
10742 any variable marked with DW_AT_external or any variable that
10743 lives in a namespace. [Variables in anonymous namespaces
10744 require prefixing, but they are not DW_AT_external.] */
10746 if (dwarf2_attr (die, DW_AT_specification, cu))
10748 struct dwarf2_cu *spec_cu = cu;
10750 return die_needs_namespace (die_specification (die, &spec_cu),
10754 attr = dwarf2_attr (die, DW_AT_external, cu);
10755 if (attr == NULL && die->parent->tag != DW_TAG_namespace
10756 && die->parent->tag != DW_TAG_module)
10758 /* A variable in a lexical block of some kind does not need a
10759 namespace, even though in C++ such variables may be external
10760 and have a mangled name. */
10761 if (die->parent->tag == DW_TAG_lexical_block
10762 || die->parent->tag == DW_TAG_try_block
10763 || die->parent->tag == DW_TAG_catch_block
10764 || die->parent->tag == DW_TAG_subprogram)
10773 /* Return the DIE's linkage name attribute, either DW_AT_linkage_name
10774 or DW_AT_MIPS_linkage_name. Returns NULL if the attribute is not
10775 defined for the given DIE. */
10777 static struct attribute *
10778 dw2_linkage_name_attr (struct die_info *die, struct dwarf2_cu *cu)
10780 struct attribute *attr;
10782 attr = dwarf2_attr (die, DW_AT_linkage_name, cu);
10784 attr = dwarf2_attr (die, DW_AT_MIPS_linkage_name, cu);
10789 /* Return the DIE's linkage name as a string, either DW_AT_linkage_name
10790 or DW_AT_MIPS_linkage_name. Returns NULL if the attribute is not
10791 defined for the given DIE. */
10793 static const char *
10794 dw2_linkage_name (struct die_info *die, struct dwarf2_cu *cu)
10796 const char *linkage_name;
10798 linkage_name = dwarf2_string_attr (die, DW_AT_linkage_name, cu);
10799 if (linkage_name == NULL)
10800 linkage_name = dwarf2_string_attr (die, DW_AT_MIPS_linkage_name, cu);
10802 return linkage_name;
10805 /* Compute the fully qualified name of DIE in CU. If PHYSNAME is nonzero,
10806 compute the physname for the object, which include a method's:
10807 - formal parameters (C++),
10808 - receiver type (Go),
10810 The term "physname" is a bit confusing.
10811 For C++, for example, it is the demangled name.
10812 For Go, for example, it's the mangled name.
10814 For Ada, return the DIE's linkage name rather than the fully qualified
10815 name. PHYSNAME is ignored..
10817 The result is allocated on the objfile_obstack and canonicalized. */
10819 static const char *
10820 dwarf2_compute_name (const char *name,
10821 struct die_info *die, struct dwarf2_cu *cu,
10824 struct objfile *objfile = cu->objfile;
10827 name = dwarf2_name (die, cu);
10829 /* For Fortran GDB prefers DW_AT_*linkage_name for the physname if present
10830 but otherwise compute it by typename_concat inside GDB.
10831 FIXME: Actually this is not really true, or at least not always true.
10832 It's all very confusing. SYMBOL_SET_NAMES doesn't try to demangle
10833 Fortran names because there is no mangling standard. So new_symbol_full
10834 will set the demangled name to the result of dwarf2_full_name, and it is
10835 the demangled name that GDB uses if it exists. */
10836 if (cu->language == language_ada
10837 || (cu->language == language_fortran && physname))
10839 /* For Ada unit, we prefer the linkage name over the name, as
10840 the former contains the exported name, which the user expects
10841 to be able to reference. Ideally, we want the user to be able
10842 to reference this entity using either natural or linkage name,
10843 but we haven't started looking at this enhancement yet. */
10844 const char *linkage_name = dw2_linkage_name (die, cu);
10846 if (linkage_name != NULL)
10847 return linkage_name;
10850 /* These are the only languages we know how to qualify names in. */
10852 && (cu->language == language_cplus
10853 || cu->language == language_fortran || cu->language == language_d
10854 || cu->language == language_rust))
10856 if (die_needs_namespace (die, cu))
10858 const char *prefix;
10859 const char *canonical_name = NULL;
10863 prefix = determine_prefix (die, cu);
10864 if (*prefix != '\0')
10866 char *prefixed_name = typename_concat (NULL, prefix, name,
10869 buf.puts (prefixed_name);
10870 xfree (prefixed_name);
10875 /* Template parameters may be specified in the DIE's DW_AT_name, or
10876 as children with DW_TAG_template_type_param or
10877 DW_TAG_value_type_param. If the latter, add them to the name
10878 here. If the name already has template parameters, then
10879 skip this step; some versions of GCC emit both, and
10880 it is more efficient to use the pre-computed name.
10882 Something to keep in mind about this process: it is very
10883 unlikely, or in some cases downright impossible, to produce
10884 something that will match the mangled name of a function.
10885 If the definition of the function has the same debug info,
10886 we should be able to match up with it anyway. But fallbacks
10887 using the minimal symbol, for instance to find a method
10888 implemented in a stripped copy of libstdc++, will not work.
10889 If we do not have debug info for the definition, we will have to
10890 match them up some other way.
10892 When we do name matching there is a related problem with function
10893 templates; two instantiated function templates are allowed to
10894 differ only by their return types, which we do not add here. */
10896 if (cu->language == language_cplus && strchr (name, '<') == NULL)
10898 struct attribute *attr;
10899 struct die_info *child;
10902 die->building_fullname = 1;
10904 for (child = die->child; child != NULL; child = child->sibling)
10908 const gdb_byte *bytes;
10909 struct dwarf2_locexpr_baton *baton;
10912 if (child->tag != DW_TAG_template_type_param
10913 && child->tag != DW_TAG_template_value_param)
10924 attr = dwarf2_attr (child, DW_AT_type, cu);
10927 complaint (&symfile_complaints,
10928 _("template parameter missing DW_AT_type"));
10929 buf.puts ("UNKNOWN_TYPE");
10932 type = die_type (child, cu);
10934 if (child->tag == DW_TAG_template_type_param)
10936 c_print_type (type, "", &buf, -1, 0, &type_print_raw_options);
10940 attr = dwarf2_attr (child, DW_AT_const_value, cu);
10943 complaint (&symfile_complaints,
10944 _("template parameter missing "
10945 "DW_AT_const_value"));
10946 buf.puts ("UNKNOWN_VALUE");
10950 dwarf2_const_value_attr (attr, type, name,
10951 &cu->comp_unit_obstack, cu,
10952 &value, &bytes, &baton);
10954 if (TYPE_NOSIGN (type))
10955 /* GDB prints characters as NUMBER 'CHAR'. If that's
10956 changed, this can use value_print instead. */
10957 c_printchar (value, type, &buf);
10960 struct value_print_options opts;
10963 v = dwarf2_evaluate_loc_desc (type, NULL,
10967 else if (bytes != NULL)
10969 v = allocate_value (type);
10970 memcpy (value_contents_writeable (v), bytes,
10971 TYPE_LENGTH (type));
10974 v = value_from_longest (type, value);
10976 /* Specify decimal so that we do not depend on
10978 get_formatted_print_options (&opts, 'd');
10980 value_print (v, &buf, &opts);
10986 die->building_fullname = 0;
10990 /* Close the argument list, with a space if necessary
10991 (nested templates). */
10992 if (!buf.empty () && buf.string ().back () == '>')
10999 /* For C++ methods, append formal parameter type
11000 information, if PHYSNAME. */
11002 if (physname && die->tag == DW_TAG_subprogram
11003 && cu->language == language_cplus)
11005 struct type *type = read_type_die (die, cu);
11007 c_type_print_args (type, &buf, 1, cu->language,
11008 &type_print_raw_options);
11010 if (cu->language == language_cplus)
11012 /* Assume that an artificial first parameter is
11013 "this", but do not crash if it is not. RealView
11014 marks unnamed (and thus unused) parameters as
11015 artificial; there is no way to differentiate
11017 if (TYPE_NFIELDS (type) > 0
11018 && TYPE_FIELD_ARTIFICIAL (type, 0)
11019 && TYPE_CODE (TYPE_FIELD_TYPE (type, 0)) == TYPE_CODE_PTR
11020 && TYPE_CONST (TYPE_TARGET_TYPE (TYPE_FIELD_TYPE (type,
11022 buf.puts (" const");
11026 const std::string &intermediate_name = buf.string ();
11028 if (cu->language == language_cplus)
11030 = dwarf2_canonicalize_name (intermediate_name.c_str (), cu,
11031 &objfile->per_bfd->storage_obstack);
11033 /* If we only computed INTERMEDIATE_NAME, or if
11034 INTERMEDIATE_NAME is already canonical, then we need to
11035 copy it to the appropriate obstack. */
11036 if (canonical_name == NULL || canonical_name == intermediate_name.c_str ())
11037 name = ((const char *)
11038 obstack_copy0 (&objfile->per_bfd->storage_obstack,
11039 intermediate_name.c_str (),
11040 intermediate_name.length ()));
11042 name = canonical_name;
11049 /* Return the fully qualified name of DIE, based on its DW_AT_name.
11050 If scope qualifiers are appropriate they will be added. The result
11051 will be allocated on the storage_obstack, or NULL if the DIE does
11052 not have a name. NAME may either be from a previous call to
11053 dwarf2_name or NULL.
11055 The output string will be canonicalized (if C++). */
11057 static const char *
11058 dwarf2_full_name (const char *name, struct die_info *die, struct dwarf2_cu *cu)
11060 return dwarf2_compute_name (name, die, cu, 0);
11063 /* Construct a physname for the given DIE in CU. NAME may either be
11064 from a previous call to dwarf2_name or NULL. The result will be
11065 allocated on the objfile_objstack or NULL if the DIE does not have a
11068 The output string will be canonicalized (if C++). */
11070 static const char *
11071 dwarf2_physname (const char *name, struct die_info *die, struct dwarf2_cu *cu)
11073 struct objfile *objfile = cu->objfile;
11074 const char *retval, *mangled = NULL, *canon = NULL;
11077 /* In this case dwarf2_compute_name is just a shortcut not building anything
11079 if (!die_needs_namespace (die, cu))
11080 return dwarf2_compute_name (name, die, cu, 1);
11082 mangled = dw2_linkage_name (die, cu);
11084 /* rustc emits invalid values for DW_AT_linkage_name. Ignore these.
11085 See https://github.com/rust-lang/rust/issues/32925. */
11086 if (cu->language == language_rust && mangled != NULL
11087 && strchr (mangled, '{') != NULL)
11090 /* DW_AT_linkage_name is missing in some cases - depend on what GDB
11092 gdb::unique_xmalloc_ptr<char> demangled;
11093 if (mangled != NULL)
11095 /* Use DMGL_RET_DROP for C++ template functions to suppress their return
11096 type. It is easier for GDB users to search for such functions as
11097 `name(params)' than `long name(params)'. In such case the minimal
11098 symbol names do not match the full symbol names but for template
11099 functions there is never a need to look up their definition from their
11100 declaration so the only disadvantage remains the minimal symbol
11101 variant `long name(params)' does not have the proper inferior type.
11104 if (cu->language == language_go)
11106 /* This is a lie, but we already lie to the caller new_symbol_full.
11107 new_symbol_full assumes we return the mangled name.
11108 This just undoes that lie until things are cleaned up. */
11112 demangled.reset (gdb_demangle (mangled,
11113 (DMGL_PARAMS | DMGL_ANSI
11114 | DMGL_RET_DROP)));
11117 canon = demangled.get ();
11125 if (canon == NULL || check_physname)
11127 const char *physname = dwarf2_compute_name (name, die, cu, 1);
11129 if (canon != NULL && strcmp (physname, canon) != 0)
11131 /* It may not mean a bug in GDB. The compiler could also
11132 compute DW_AT_linkage_name incorrectly. But in such case
11133 GDB would need to be bug-to-bug compatible. */
11135 complaint (&symfile_complaints,
11136 _("Computed physname <%s> does not match demangled <%s> "
11137 "(from linkage <%s>) - DIE at 0x%x [in module %s]"),
11138 physname, canon, mangled, to_underlying (die->sect_off),
11139 objfile_name (objfile));
11141 /* Prefer DW_AT_linkage_name (in the CANON form) - when it
11142 is available here - over computed PHYSNAME. It is safer
11143 against both buggy GDB and buggy compilers. */
11157 retval = ((const char *)
11158 obstack_copy0 (&objfile->per_bfd->storage_obstack,
11159 retval, strlen (retval)));
11164 /* Inspect DIE in CU for a namespace alias. If one exists, record
11165 a new symbol for it.
11167 Returns 1 if a namespace alias was recorded, 0 otherwise. */
11170 read_namespace_alias (struct die_info *die, struct dwarf2_cu *cu)
11172 struct attribute *attr;
11174 /* If the die does not have a name, this is not a namespace
11176 attr = dwarf2_attr (die, DW_AT_name, cu);
11180 struct die_info *d = die;
11181 struct dwarf2_cu *imported_cu = cu;
11183 /* If the compiler has nested DW_AT_imported_declaration DIEs,
11184 keep inspecting DIEs until we hit the underlying import. */
11185 #define MAX_NESTED_IMPORTED_DECLARATIONS 100
11186 for (num = 0; num < MAX_NESTED_IMPORTED_DECLARATIONS; ++num)
11188 attr = dwarf2_attr (d, DW_AT_import, cu);
11192 d = follow_die_ref (d, attr, &imported_cu);
11193 if (d->tag != DW_TAG_imported_declaration)
11197 if (num == MAX_NESTED_IMPORTED_DECLARATIONS)
11199 complaint (&symfile_complaints,
11200 _("DIE at 0x%x has too many recursively imported "
11201 "declarations"), to_underlying (d->sect_off));
11208 sect_offset sect_off = dwarf2_get_ref_die_offset (attr);
11210 type = get_die_type_at_offset (sect_off, cu->per_cu);
11211 if (type != NULL && TYPE_CODE (type) == TYPE_CODE_NAMESPACE)
11213 /* This declaration is a global namespace alias. Add
11214 a symbol for it whose type is the aliased namespace. */
11215 new_symbol (die, type, cu);
11224 /* Return the using directives repository (global or local?) to use in the
11225 current context for LANGUAGE.
11227 For Ada, imported declarations can materialize renamings, which *may* be
11228 global. However it is impossible (for now?) in DWARF to distinguish
11229 "external" imported declarations and "static" ones. As all imported
11230 declarations seem to be static in all other languages, make them all CU-wide
11231 global only in Ada. */
11233 static struct using_direct **
11234 using_directives (enum language language)
11236 if (language == language_ada && context_stack_depth == 0)
11237 return &global_using_directives;
11239 return &local_using_directives;
11242 /* Read the import statement specified by the given die and record it. */
11245 read_import_statement (struct die_info *die, struct dwarf2_cu *cu)
11247 struct objfile *objfile = cu->objfile;
11248 struct attribute *import_attr;
11249 struct die_info *imported_die, *child_die;
11250 struct dwarf2_cu *imported_cu;
11251 const char *imported_name;
11252 const char *imported_name_prefix;
11253 const char *canonical_name;
11254 const char *import_alias;
11255 const char *imported_declaration = NULL;
11256 const char *import_prefix;
11257 std::vector<const char *> excludes;
11259 import_attr = dwarf2_attr (die, DW_AT_import, cu);
11260 if (import_attr == NULL)
11262 complaint (&symfile_complaints, _("Tag '%s' has no DW_AT_import"),
11263 dwarf_tag_name (die->tag));
11268 imported_die = follow_die_ref_or_sig (die, import_attr, &imported_cu);
11269 imported_name = dwarf2_name (imported_die, imported_cu);
11270 if (imported_name == NULL)
11272 /* GCC bug: https://bugzilla.redhat.com/show_bug.cgi?id=506524
11274 The import in the following code:
11288 <2><51>: Abbrev Number: 3 (DW_TAG_imported_declaration)
11289 <52> DW_AT_decl_file : 1
11290 <53> DW_AT_decl_line : 6
11291 <54> DW_AT_import : <0x75>
11292 <2><58>: Abbrev Number: 4 (DW_TAG_typedef)
11293 <59> DW_AT_name : B
11294 <5b> DW_AT_decl_file : 1
11295 <5c> DW_AT_decl_line : 2
11296 <5d> DW_AT_type : <0x6e>
11298 <1><75>: Abbrev Number: 7 (DW_TAG_base_type)
11299 <76> DW_AT_byte_size : 4
11300 <77> DW_AT_encoding : 5 (signed)
11302 imports the wrong die ( 0x75 instead of 0x58 ).
11303 This case will be ignored until the gcc bug is fixed. */
11307 /* Figure out the local name after import. */
11308 import_alias = dwarf2_name (die, cu);
11310 /* Figure out where the statement is being imported to. */
11311 import_prefix = determine_prefix (die, cu);
11313 /* Figure out what the scope of the imported die is and prepend it
11314 to the name of the imported die. */
11315 imported_name_prefix = determine_prefix (imported_die, imported_cu);
11317 if (imported_die->tag != DW_TAG_namespace
11318 && imported_die->tag != DW_TAG_module)
11320 imported_declaration = imported_name;
11321 canonical_name = imported_name_prefix;
11323 else if (strlen (imported_name_prefix) > 0)
11324 canonical_name = obconcat (&objfile->objfile_obstack,
11325 imported_name_prefix,
11326 (cu->language == language_d ? "." : "::"),
11327 imported_name, (char *) NULL);
11329 canonical_name = imported_name;
11331 if (die->tag == DW_TAG_imported_module && cu->language == language_fortran)
11332 for (child_die = die->child; child_die && child_die->tag;
11333 child_die = sibling_die (child_die))
11335 /* DWARF-4: A Fortran use statement with a “rename list” may be
11336 represented by an imported module entry with an import attribute
11337 referring to the module and owned entries corresponding to those
11338 entities that are renamed as part of being imported. */
11340 if (child_die->tag != DW_TAG_imported_declaration)
11342 complaint (&symfile_complaints,
11343 _("child DW_TAG_imported_declaration expected "
11344 "- DIE at 0x%x [in module %s]"),
11345 to_underlying (child_die->sect_off), objfile_name (objfile));
11349 import_attr = dwarf2_attr (child_die, DW_AT_import, cu);
11350 if (import_attr == NULL)
11352 complaint (&symfile_complaints, _("Tag '%s' has no DW_AT_import"),
11353 dwarf_tag_name (child_die->tag));
11358 imported_die = follow_die_ref_or_sig (child_die, import_attr,
11360 imported_name = dwarf2_name (imported_die, imported_cu);
11361 if (imported_name == NULL)
11363 complaint (&symfile_complaints,
11364 _("child DW_TAG_imported_declaration has unknown "
11365 "imported name - DIE at 0x%x [in module %s]"),
11366 to_underlying (child_die->sect_off), objfile_name (objfile));
11370 excludes.push_back (imported_name);
11372 process_die (child_die, cu);
11375 add_using_directive (using_directives (cu->language),
11379 imported_declaration,
11382 &objfile->objfile_obstack);
11385 /* ICC<14 does not output the required DW_AT_declaration on incomplete
11386 types, but gives them a size of zero. Starting with version 14,
11387 ICC is compatible with GCC. */
11390 producer_is_icc_lt_14 (struct dwarf2_cu *cu)
11392 if (!cu->checked_producer)
11393 check_producer (cu);
11395 return cu->producer_is_icc_lt_14;
11398 /* Check for possibly missing DW_AT_comp_dir with relative .debug_line
11399 directory paths. GCC SVN r127613 (new option -fdebug-prefix-map) fixed
11400 this, it was first present in GCC release 4.3.0. */
11403 producer_is_gcc_lt_4_3 (struct dwarf2_cu *cu)
11405 if (!cu->checked_producer)
11406 check_producer (cu);
11408 return cu->producer_is_gcc_lt_4_3;
11411 static file_and_directory
11412 find_file_and_directory (struct die_info *die, struct dwarf2_cu *cu)
11414 file_and_directory res;
11416 /* Find the filename. Do not use dwarf2_name here, since the filename
11417 is not a source language identifier. */
11418 res.name = dwarf2_string_attr (die, DW_AT_name, cu);
11419 res.comp_dir = dwarf2_string_attr (die, DW_AT_comp_dir, cu);
11421 if (res.comp_dir == NULL
11422 && producer_is_gcc_lt_4_3 (cu) && res.name != NULL
11423 && IS_ABSOLUTE_PATH (res.name))
11425 res.comp_dir_storage = ldirname (res.name);
11426 if (!res.comp_dir_storage.empty ())
11427 res.comp_dir = res.comp_dir_storage.c_str ();
11429 if (res.comp_dir != NULL)
11431 /* Irix 6.2 native cc prepends <machine>.: to the compilation
11432 directory, get rid of it. */
11433 const char *cp = strchr (res.comp_dir, ':');
11435 if (cp && cp != res.comp_dir && cp[-1] == '.' && cp[1] == '/')
11436 res.comp_dir = cp + 1;
11439 if (res.name == NULL)
11440 res.name = "<unknown>";
11445 /* Handle DW_AT_stmt_list for a compilation unit.
11446 DIE is the DW_TAG_compile_unit die for CU.
11447 COMP_DIR is the compilation directory. LOWPC is passed to
11448 dwarf_decode_lines. See dwarf_decode_lines comments about it. */
11451 handle_DW_AT_stmt_list (struct die_info *die, struct dwarf2_cu *cu,
11452 const char *comp_dir, CORE_ADDR lowpc) /* ARI: editCase function */
11454 struct objfile *objfile = dwarf2_per_objfile->objfile;
11455 struct attribute *attr;
11456 struct line_header line_header_local;
11457 hashval_t line_header_local_hash;
11459 int decode_mapping;
11461 gdb_assert (! cu->per_cu->is_debug_types);
11463 attr = dwarf2_attr (die, DW_AT_stmt_list, cu);
11467 sect_offset line_offset = (sect_offset) DW_UNSND (attr);
11469 /* The line header hash table is only created if needed (it exists to
11470 prevent redundant reading of the line table for partial_units).
11471 If we're given a partial_unit, we'll need it. If we're given a
11472 compile_unit, then use the line header hash table if it's already
11473 created, but don't create one just yet. */
11475 if (dwarf2_per_objfile->line_header_hash == NULL
11476 && die->tag == DW_TAG_partial_unit)
11478 dwarf2_per_objfile->line_header_hash
11479 = htab_create_alloc_ex (127, line_header_hash_voidp,
11480 line_header_eq_voidp,
11481 free_line_header_voidp,
11482 &objfile->objfile_obstack,
11483 hashtab_obstack_allocate,
11484 dummy_obstack_deallocate);
11487 line_header_local.sect_off = line_offset;
11488 line_header_local.offset_in_dwz = cu->per_cu->is_dwz;
11489 line_header_local_hash = line_header_hash (&line_header_local);
11490 if (dwarf2_per_objfile->line_header_hash != NULL)
11492 slot = htab_find_slot_with_hash (dwarf2_per_objfile->line_header_hash,
11493 &line_header_local,
11494 line_header_local_hash, NO_INSERT);
11496 /* For DW_TAG_compile_unit we need info like symtab::linetable which
11497 is not present in *SLOT (since if there is something in *SLOT then
11498 it will be for a partial_unit). */
11499 if (die->tag == DW_TAG_partial_unit && slot != NULL)
11501 gdb_assert (*slot != NULL);
11502 cu->line_header = (struct line_header *) *slot;
11507 /* dwarf_decode_line_header does not yet provide sufficient information.
11508 We always have to call also dwarf_decode_lines for it. */
11509 line_header_up lh = dwarf_decode_line_header (line_offset, cu);
11513 cu->line_header = lh.release ();
11514 cu->line_header_die_owner = die;
11516 if (dwarf2_per_objfile->line_header_hash == NULL)
11520 slot = htab_find_slot_with_hash (dwarf2_per_objfile->line_header_hash,
11521 &line_header_local,
11522 line_header_local_hash, INSERT);
11523 gdb_assert (slot != NULL);
11525 if (slot != NULL && *slot == NULL)
11527 /* This newly decoded line number information unit will be owned
11528 by line_header_hash hash table. */
11529 *slot = cu->line_header;
11530 cu->line_header_die_owner = NULL;
11534 /* We cannot free any current entry in (*slot) as that struct line_header
11535 may be already used by multiple CUs. Create only temporary decoded
11536 line_header for this CU - it may happen at most once for each line
11537 number information unit. And if we're not using line_header_hash
11538 then this is what we want as well. */
11539 gdb_assert (die->tag != DW_TAG_partial_unit);
11541 decode_mapping = (die->tag != DW_TAG_partial_unit);
11542 dwarf_decode_lines (cu->line_header, comp_dir, cu, NULL, lowpc,
11547 /* Process DW_TAG_compile_unit or DW_TAG_partial_unit. */
11550 read_file_scope (struct die_info *die, struct dwarf2_cu *cu)
11552 struct objfile *objfile = dwarf2_per_objfile->objfile;
11553 struct gdbarch *gdbarch = get_objfile_arch (objfile);
11554 CORE_ADDR lowpc = ((CORE_ADDR) -1);
11555 CORE_ADDR highpc = ((CORE_ADDR) 0);
11556 struct attribute *attr;
11557 struct die_info *child_die;
11558 CORE_ADDR baseaddr;
11560 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
11562 get_scope_pc_bounds (die, &lowpc, &highpc, cu);
11564 /* If we didn't find a lowpc, set it to highpc to avoid complaints
11565 from finish_block. */
11566 if (lowpc == ((CORE_ADDR) -1))
11568 lowpc = gdbarch_adjust_dwarf2_addr (gdbarch, lowpc + baseaddr);
11570 file_and_directory fnd = find_file_and_directory (die, cu);
11572 prepare_one_comp_unit (cu, die, cu->language);
11574 /* The XLCL doesn't generate DW_LANG_OpenCL because this attribute is not
11575 standardised yet. As a workaround for the language detection we fall
11576 back to the DW_AT_producer string. */
11577 if (cu->producer && strstr (cu->producer, "IBM XL C for OpenCL") != NULL)
11578 cu->language = language_opencl;
11580 /* Similar hack for Go. */
11581 if (cu->producer && strstr (cu->producer, "GNU Go ") != NULL)
11582 set_cu_language (DW_LANG_Go, cu);
11584 dwarf2_start_symtab (cu, fnd.name, fnd.comp_dir, lowpc);
11586 /* Decode line number information if present. We do this before
11587 processing child DIEs, so that the line header table is available
11588 for DW_AT_decl_file. */
11589 handle_DW_AT_stmt_list (die, cu, fnd.comp_dir, lowpc);
11591 /* Process all dies in compilation unit. */
11592 if (die->child != NULL)
11594 child_die = die->child;
11595 while (child_die && child_die->tag)
11597 process_die (child_die, cu);
11598 child_die = sibling_die (child_die);
11602 /* Decode macro information, if present. Dwarf 2 macro information
11603 refers to information in the line number info statement program
11604 header, so we can only read it if we've read the header
11606 attr = dwarf2_attr (die, DW_AT_macros, cu);
11608 attr = dwarf2_attr (die, DW_AT_GNU_macros, cu);
11609 if (attr && cu->line_header)
11611 if (dwarf2_attr (die, DW_AT_macro_info, cu))
11612 complaint (&symfile_complaints,
11613 _("CU refers to both DW_AT_macros and DW_AT_macro_info"));
11615 dwarf_decode_macros (cu, DW_UNSND (attr), 1);
11619 attr = dwarf2_attr (die, DW_AT_macro_info, cu);
11620 if (attr && cu->line_header)
11622 unsigned int macro_offset = DW_UNSND (attr);
11624 dwarf_decode_macros (cu, macro_offset, 0);
11629 /* TU version of handle_DW_AT_stmt_list for read_type_unit_scope.
11630 Create the set of symtabs used by this TU, or if this TU is sharing
11631 symtabs with another TU and the symtabs have already been created
11632 then restore those symtabs in the line header.
11633 We don't need the pc/line-number mapping for type units. */
11636 setup_type_unit_groups (struct die_info *die, struct dwarf2_cu *cu)
11638 struct dwarf2_per_cu_data *per_cu = cu->per_cu;
11639 struct type_unit_group *tu_group;
11641 struct attribute *attr;
11643 struct signatured_type *sig_type;
11645 gdb_assert (per_cu->is_debug_types);
11646 sig_type = (struct signatured_type *) per_cu;
11648 attr = dwarf2_attr (die, DW_AT_stmt_list, cu);
11650 /* If we're using .gdb_index (includes -readnow) then
11651 per_cu->type_unit_group may not have been set up yet. */
11652 if (sig_type->type_unit_group == NULL)
11653 sig_type->type_unit_group = get_type_unit_group (cu, attr);
11654 tu_group = sig_type->type_unit_group;
11656 /* If we've already processed this stmt_list there's no real need to
11657 do it again, we could fake it and just recreate the part we need
11658 (file name,index -> symtab mapping). If data shows this optimization
11659 is useful we can do it then. */
11660 first_time = tu_group->compunit_symtab == NULL;
11662 /* We have to handle the case of both a missing DW_AT_stmt_list or bad
11667 sect_offset line_offset = (sect_offset) DW_UNSND (attr);
11668 lh = dwarf_decode_line_header (line_offset, cu);
11673 dwarf2_start_symtab (cu, "", NULL, 0);
11676 gdb_assert (tu_group->symtabs == NULL);
11677 restart_symtab (tu_group->compunit_symtab, "", 0);
11682 cu->line_header = lh.release ();
11683 cu->line_header_die_owner = die;
11687 struct compunit_symtab *cust = dwarf2_start_symtab (cu, "", NULL, 0);
11689 /* Note: We don't assign tu_group->compunit_symtab yet because we're
11690 still initializing it, and our caller (a few levels up)
11691 process_full_type_unit still needs to know if this is the first
11694 tu_group->num_symtabs = cu->line_header->file_names.size ();
11695 tu_group->symtabs = XNEWVEC (struct symtab *,
11696 cu->line_header->file_names.size ());
11698 for (i = 0; i < cu->line_header->file_names.size (); ++i)
11700 file_entry &fe = cu->line_header->file_names[i];
11702 dwarf2_start_subfile (fe.name, fe.include_dir (cu->line_header));
11704 if (current_subfile->symtab == NULL)
11706 /* NOTE: start_subfile will recognize when it's been
11707 passed a file it has already seen. So we can't
11708 assume there's a simple mapping from
11709 cu->line_header->file_names to subfiles, plus
11710 cu->line_header->file_names may contain dups. */
11711 current_subfile->symtab
11712 = allocate_symtab (cust, current_subfile->name);
11715 fe.symtab = current_subfile->symtab;
11716 tu_group->symtabs[i] = fe.symtab;
11721 restart_symtab (tu_group->compunit_symtab, "", 0);
11723 for (i = 0; i < cu->line_header->file_names.size (); ++i)
11725 file_entry &fe = cu->line_header->file_names[i];
11727 fe.symtab = tu_group->symtabs[i];
11731 /* The main symtab is allocated last. Type units don't have DW_AT_name
11732 so they don't have a "real" (so to speak) symtab anyway.
11733 There is later code that will assign the main symtab to all symbols
11734 that don't have one. We need to handle the case of a symbol with a
11735 missing symtab (DW_AT_decl_file) anyway. */
11738 /* Process DW_TAG_type_unit.
11739 For TUs we want to skip the first top level sibling if it's not the
11740 actual type being defined by this TU. In this case the first top
11741 level sibling is there to provide context only. */
11744 read_type_unit_scope (struct die_info *die, struct dwarf2_cu *cu)
11746 struct die_info *child_die;
11748 prepare_one_comp_unit (cu, die, language_minimal);
11750 /* Initialize (or reinitialize) the machinery for building symtabs.
11751 We do this before processing child DIEs, so that the line header table
11752 is available for DW_AT_decl_file. */
11753 setup_type_unit_groups (die, cu);
11755 if (die->child != NULL)
11757 child_die = die->child;
11758 while (child_die && child_die->tag)
11760 process_die (child_die, cu);
11761 child_die = sibling_die (child_die);
11768 http://gcc.gnu.org/wiki/DebugFission
11769 http://gcc.gnu.org/wiki/DebugFissionDWP
11771 To simplify handling of both DWO files ("object" files with the DWARF info)
11772 and DWP files (a file with the DWOs packaged up into one file), we treat
11773 DWP files as having a collection of virtual DWO files. */
11776 hash_dwo_file (const void *item)
11778 const struct dwo_file *dwo_file = (const struct dwo_file *) item;
11781 hash = htab_hash_string (dwo_file->dwo_name);
11782 if (dwo_file->comp_dir != NULL)
11783 hash += htab_hash_string (dwo_file->comp_dir);
11788 eq_dwo_file (const void *item_lhs, const void *item_rhs)
11790 const struct dwo_file *lhs = (const struct dwo_file *) item_lhs;
11791 const struct dwo_file *rhs = (const struct dwo_file *) item_rhs;
11793 if (strcmp (lhs->dwo_name, rhs->dwo_name) != 0)
11795 if (lhs->comp_dir == NULL || rhs->comp_dir == NULL)
11796 return lhs->comp_dir == rhs->comp_dir;
11797 return strcmp (lhs->comp_dir, rhs->comp_dir) == 0;
11800 /* Allocate a hash table for DWO files. */
11803 allocate_dwo_file_hash_table (void)
11805 struct objfile *objfile = dwarf2_per_objfile->objfile;
11807 return htab_create_alloc_ex (41,
11811 &objfile->objfile_obstack,
11812 hashtab_obstack_allocate,
11813 dummy_obstack_deallocate);
11816 /* Lookup DWO file DWO_NAME. */
11819 lookup_dwo_file_slot (const char *dwo_name, const char *comp_dir)
11821 struct dwo_file find_entry;
11824 if (dwarf2_per_objfile->dwo_files == NULL)
11825 dwarf2_per_objfile->dwo_files = allocate_dwo_file_hash_table ();
11827 memset (&find_entry, 0, sizeof (find_entry));
11828 find_entry.dwo_name = dwo_name;
11829 find_entry.comp_dir = comp_dir;
11830 slot = htab_find_slot (dwarf2_per_objfile->dwo_files, &find_entry, INSERT);
11836 hash_dwo_unit (const void *item)
11838 const struct dwo_unit *dwo_unit = (const struct dwo_unit *) item;
11840 /* This drops the top 32 bits of the id, but is ok for a hash. */
11841 return dwo_unit->signature;
11845 eq_dwo_unit (const void *item_lhs, const void *item_rhs)
11847 const struct dwo_unit *lhs = (const struct dwo_unit *) item_lhs;
11848 const struct dwo_unit *rhs = (const struct dwo_unit *) item_rhs;
11850 /* The signature is assumed to be unique within the DWO file.
11851 So while object file CU dwo_id's always have the value zero,
11852 that's OK, assuming each object file DWO file has only one CU,
11853 and that's the rule for now. */
11854 return lhs->signature == rhs->signature;
11857 /* Allocate a hash table for DWO CUs,TUs.
11858 There is one of these tables for each of CUs,TUs for each DWO file. */
11861 allocate_dwo_unit_table (struct objfile *objfile)
11863 /* Start out with a pretty small number.
11864 Generally DWO files contain only one CU and maybe some TUs. */
11865 return htab_create_alloc_ex (3,
11869 &objfile->objfile_obstack,
11870 hashtab_obstack_allocate,
11871 dummy_obstack_deallocate);
11874 /* Structure used to pass data to create_dwo_debug_info_hash_table_reader. */
11876 struct create_dwo_cu_data
11878 struct dwo_file *dwo_file;
11879 struct dwo_unit dwo_unit;
11882 /* die_reader_func for create_dwo_cu. */
11885 create_dwo_cu_reader (const struct die_reader_specs *reader,
11886 const gdb_byte *info_ptr,
11887 struct die_info *comp_unit_die,
11891 struct dwarf2_cu *cu = reader->cu;
11892 sect_offset sect_off = cu->per_cu->sect_off;
11893 struct dwarf2_section_info *section = cu->per_cu->section;
11894 struct create_dwo_cu_data *data = (struct create_dwo_cu_data *) datap;
11895 struct dwo_file *dwo_file = data->dwo_file;
11896 struct dwo_unit *dwo_unit = &data->dwo_unit;
11897 struct attribute *attr;
11899 attr = dwarf2_attr (comp_unit_die, DW_AT_GNU_dwo_id, cu);
11902 complaint (&symfile_complaints,
11903 _("Dwarf Error: debug entry at offset 0x%x is missing"
11904 " its dwo_id [in module %s]"),
11905 to_underlying (sect_off), dwo_file->dwo_name);
11909 dwo_unit->dwo_file = dwo_file;
11910 dwo_unit->signature = DW_UNSND (attr);
11911 dwo_unit->section = section;
11912 dwo_unit->sect_off = sect_off;
11913 dwo_unit->length = cu->per_cu->length;
11915 if (dwarf_read_debug)
11916 fprintf_unfiltered (gdb_stdlog, " offset 0x%x, dwo_id %s\n",
11917 to_underlying (sect_off),
11918 hex_string (dwo_unit->signature));
11921 /* Create the dwo_units for the CUs in a DWO_FILE.
11922 Note: This function processes DWO files only, not DWP files. */
11925 create_cus_hash_table (struct dwo_file &dwo_file, dwarf2_section_info §ion,
11928 struct objfile *objfile = dwarf2_per_objfile->objfile;
11929 const gdb_byte *info_ptr, *end_ptr;
11931 dwarf2_read_section (objfile, §ion);
11932 info_ptr = section.buffer;
11934 if (info_ptr == NULL)
11937 if (dwarf_read_debug)
11939 fprintf_unfiltered (gdb_stdlog, "Reading %s for %s:\n",
11940 get_section_name (§ion),
11941 get_section_file_name (§ion));
11944 end_ptr = info_ptr + section.size;
11945 while (info_ptr < end_ptr)
11947 struct dwarf2_per_cu_data per_cu;
11948 struct create_dwo_cu_data create_dwo_cu_data;
11949 struct dwo_unit *dwo_unit;
11951 sect_offset sect_off = (sect_offset) (info_ptr - section.buffer);
11953 memset (&create_dwo_cu_data.dwo_unit, 0,
11954 sizeof (create_dwo_cu_data.dwo_unit));
11955 memset (&per_cu, 0, sizeof (per_cu));
11956 per_cu.objfile = objfile;
11957 per_cu.is_debug_types = 0;
11958 per_cu.sect_off = sect_offset (info_ptr - section.buffer);
11959 per_cu.section = §ion;
11960 create_dwo_cu_data.dwo_file = &dwo_file;
11962 init_cutu_and_read_dies_no_follow (
11963 &per_cu, &dwo_file, create_dwo_cu_reader, &create_dwo_cu_data);
11964 info_ptr += per_cu.length;
11966 // If the unit could not be parsed, skip it.
11967 if (create_dwo_cu_data.dwo_unit.dwo_file == NULL)
11970 if (cus_htab == NULL)
11971 cus_htab = allocate_dwo_unit_table (objfile);
11973 dwo_unit = OBSTACK_ZALLOC (&objfile->objfile_obstack, struct dwo_unit);
11974 *dwo_unit = create_dwo_cu_data.dwo_unit;
11975 slot = htab_find_slot (cus_htab, dwo_unit, INSERT);
11976 gdb_assert (slot != NULL);
11979 const struct dwo_unit *dup_cu = (const struct dwo_unit *)*slot;
11980 sect_offset dup_sect_off = dup_cu->sect_off;
11982 complaint (&symfile_complaints,
11983 _("debug cu entry at offset 0x%x is duplicate to"
11984 " the entry at offset 0x%x, signature %s"),
11985 to_underlying (sect_off), to_underlying (dup_sect_off),
11986 hex_string (dwo_unit->signature));
11988 *slot = (void *)dwo_unit;
11992 /* DWP file .debug_{cu,tu}_index section format:
11993 [ref: http://gcc.gnu.org/wiki/DebugFissionDWP]
11997 Both index sections have the same format, and serve to map a 64-bit
11998 signature to a set of section numbers. Each section begins with a header,
11999 followed by a hash table of 64-bit signatures, a parallel table of 32-bit
12000 indexes, and a pool of 32-bit section numbers. The index sections will be
12001 aligned at 8-byte boundaries in the file.
12003 The index section header consists of:
12005 V, 32 bit version number
12007 N, 32 bit number of compilation units or type units in the index
12008 M, 32 bit number of slots in the hash table
12010 Numbers are recorded using the byte order of the application binary.
12012 The hash table begins at offset 16 in the section, and consists of an array
12013 of M 64-bit slots. Each slot contains a 64-bit signature (using the byte
12014 order of the application binary). Unused slots in the hash table are 0.
12015 (We rely on the extreme unlikeliness of a signature being exactly 0.)
12017 The parallel table begins immediately after the hash table
12018 (at offset 16 + 8 * M from the beginning of the section), and consists of an
12019 array of 32-bit indexes (using the byte order of the application binary),
12020 corresponding 1-1 with slots in the hash table. Each entry in the parallel
12021 table contains a 32-bit index into the pool of section numbers. For unused
12022 hash table slots, the corresponding entry in the parallel table will be 0.
12024 The pool of section numbers begins immediately following the hash table
12025 (at offset 16 + 12 * M from the beginning of the section). The pool of
12026 section numbers consists of an array of 32-bit words (using the byte order
12027 of the application binary). Each item in the array is indexed starting
12028 from 0. The hash table entry provides the index of the first section
12029 number in the set. Additional section numbers in the set follow, and the
12030 set is terminated by a 0 entry (section number 0 is not used in ELF).
12032 In each set of section numbers, the .debug_info.dwo or .debug_types.dwo
12033 section must be the first entry in the set, and the .debug_abbrev.dwo must
12034 be the second entry. Other members of the set may follow in any order.
12040 DWP Version 2 combines all the .debug_info, etc. sections into one,
12041 and the entries in the index tables are now offsets into these sections.
12042 CU offsets begin at 0. TU offsets begin at the size of the .debug_info
12045 Index Section Contents:
12047 Hash Table of Signatures dwp_hash_table.hash_table
12048 Parallel Table of Indices dwp_hash_table.unit_table
12049 Table of Section Offsets dwp_hash_table.v2.{section_ids,offsets}
12050 Table of Section Sizes dwp_hash_table.v2.sizes
12052 The index section header consists of:
12054 V, 32 bit version number
12055 L, 32 bit number of columns in the table of section offsets
12056 N, 32 bit number of compilation units or type units in the index
12057 M, 32 bit number of slots in the hash table
12059 Numbers are recorded using the byte order of the application binary.
12061 The hash table has the same format as version 1.
12062 The parallel table of indices has the same format as version 1,
12063 except that the entries are origin-1 indices into the table of sections
12064 offsets and the table of section sizes.
12066 The table of offsets begins immediately following the parallel table
12067 (at offset 16 + 12 * M from the beginning of the section). The table is
12068 a two-dimensional array of 32-bit words (using the byte order of the
12069 application binary), with L columns and N+1 rows, in row-major order.
12070 Each row in the array is indexed starting from 0. The first row provides
12071 a key to the remaining rows: each column in this row provides an identifier
12072 for a debug section, and the offsets in the same column of subsequent rows
12073 refer to that section. The section identifiers are:
12075 DW_SECT_INFO 1 .debug_info.dwo
12076 DW_SECT_TYPES 2 .debug_types.dwo
12077 DW_SECT_ABBREV 3 .debug_abbrev.dwo
12078 DW_SECT_LINE 4 .debug_line.dwo
12079 DW_SECT_LOC 5 .debug_loc.dwo
12080 DW_SECT_STR_OFFSETS 6 .debug_str_offsets.dwo
12081 DW_SECT_MACINFO 7 .debug_macinfo.dwo
12082 DW_SECT_MACRO 8 .debug_macro.dwo
12084 The offsets provided by the CU and TU index sections are the base offsets
12085 for the contributions made by each CU or TU to the corresponding section
12086 in the package file. Each CU and TU header contains an abbrev_offset
12087 field, used to find the abbreviations table for that CU or TU within the
12088 contribution to the .debug_abbrev.dwo section for that CU or TU, and should
12089 be interpreted as relative to the base offset given in the index section.
12090 Likewise, offsets into .debug_line.dwo from DW_AT_stmt_list attributes
12091 should be interpreted as relative to the base offset for .debug_line.dwo,
12092 and offsets into other debug sections obtained from DWARF attributes should
12093 also be interpreted as relative to the corresponding base offset.
12095 The table of sizes begins immediately following the table of offsets.
12096 Like the table of offsets, it is a two-dimensional array of 32-bit words,
12097 with L columns and N rows, in row-major order. Each row in the array is
12098 indexed starting from 1 (row 0 is shared by the two tables).
12102 Hash table lookup is handled the same in version 1 and 2:
12104 We assume that N and M will not exceed 2^32 - 1.
12105 The size of the hash table, M, must be 2^k such that 2^k > 3*N/2.
12107 Given a 64-bit compilation unit signature or a type signature S, an entry
12108 in the hash table is located as follows:
12110 1) Calculate a primary hash H = S & MASK(k), where MASK(k) is a mask with
12111 the low-order k bits all set to 1.
12113 2) Calculate a secondary hash H' = (((S >> 32) & MASK(k)) | 1).
12115 3) If the hash table entry at index H matches the signature, use that
12116 entry. If the hash table entry at index H is unused (all zeroes),
12117 terminate the search: the signature is not present in the table.
12119 4) Let H = (H + H') modulo M. Repeat at Step 3.
12121 Because M > N and H' and M are relatively prime, the search is guaranteed
12122 to stop at an unused slot or find the match. */
12124 /* Create a hash table to map DWO IDs to their CU/TU entry in
12125 .debug_{info,types}.dwo in DWP_FILE.
12126 Returns NULL if there isn't one.
12127 Note: This function processes DWP files only, not DWO files. */
12129 static struct dwp_hash_table *
12130 create_dwp_hash_table (struct dwp_file *dwp_file, int is_debug_types)
12132 struct objfile *objfile = dwarf2_per_objfile->objfile;
12133 bfd *dbfd = dwp_file->dbfd;
12134 const gdb_byte *index_ptr, *index_end;
12135 struct dwarf2_section_info *index;
12136 uint32_t version, nr_columns, nr_units, nr_slots;
12137 struct dwp_hash_table *htab;
12139 if (is_debug_types)
12140 index = &dwp_file->sections.tu_index;
12142 index = &dwp_file->sections.cu_index;
12144 if (dwarf2_section_empty_p (index))
12146 dwarf2_read_section (objfile, index);
12148 index_ptr = index->buffer;
12149 index_end = index_ptr + index->size;
12151 version = read_4_bytes (dbfd, index_ptr);
12154 nr_columns = read_4_bytes (dbfd, index_ptr);
12158 nr_units = read_4_bytes (dbfd, index_ptr);
12160 nr_slots = read_4_bytes (dbfd, index_ptr);
12163 if (version != 1 && version != 2)
12165 error (_("Dwarf Error: unsupported DWP file version (%s)"
12166 " [in module %s]"),
12167 pulongest (version), dwp_file->name);
12169 if (nr_slots != (nr_slots & -nr_slots))
12171 error (_("Dwarf Error: number of slots in DWP hash table (%s)"
12172 " is not power of 2 [in module %s]"),
12173 pulongest (nr_slots), dwp_file->name);
12176 htab = OBSTACK_ZALLOC (&objfile->objfile_obstack, struct dwp_hash_table);
12177 htab->version = version;
12178 htab->nr_columns = nr_columns;
12179 htab->nr_units = nr_units;
12180 htab->nr_slots = nr_slots;
12181 htab->hash_table = index_ptr;
12182 htab->unit_table = htab->hash_table + sizeof (uint64_t) * nr_slots;
12184 /* Exit early if the table is empty. */
12185 if (nr_slots == 0 || nr_units == 0
12186 || (version == 2 && nr_columns == 0))
12188 /* All must be zero. */
12189 if (nr_slots != 0 || nr_units != 0
12190 || (version == 2 && nr_columns != 0))
12192 complaint (&symfile_complaints,
12193 _("Empty DWP but nr_slots,nr_units,nr_columns not"
12194 " all zero [in modules %s]"),
12202 htab->section_pool.v1.indices =
12203 htab->unit_table + sizeof (uint32_t) * nr_slots;
12204 /* It's harder to decide whether the section is too small in v1.
12205 V1 is deprecated anyway so we punt. */
12209 const gdb_byte *ids_ptr = htab->unit_table + sizeof (uint32_t) * nr_slots;
12210 int *ids = htab->section_pool.v2.section_ids;
12211 /* Reverse map for error checking. */
12212 int ids_seen[DW_SECT_MAX + 1];
12215 if (nr_columns < 2)
12217 error (_("Dwarf Error: bad DWP hash table, too few columns"
12218 " in section table [in module %s]"),
12221 if (nr_columns > MAX_NR_V2_DWO_SECTIONS)
12223 error (_("Dwarf Error: bad DWP hash table, too many columns"
12224 " in section table [in module %s]"),
12227 memset (ids, 255, (DW_SECT_MAX + 1) * sizeof (int32_t));
12228 memset (ids_seen, 255, (DW_SECT_MAX + 1) * sizeof (int32_t));
12229 for (i = 0; i < nr_columns; ++i)
12231 int id = read_4_bytes (dbfd, ids_ptr + i * sizeof (uint32_t));
12233 if (id < DW_SECT_MIN || id > DW_SECT_MAX)
12235 error (_("Dwarf Error: bad DWP hash table, bad section id %d"
12236 " in section table [in module %s]"),
12237 id, dwp_file->name);
12239 if (ids_seen[id] != -1)
12241 error (_("Dwarf Error: bad DWP hash table, duplicate section"
12242 " id %d in section table [in module %s]"),
12243 id, dwp_file->name);
12248 /* Must have exactly one info or types section. */
12249 if (((ids_seen[DW_SECT_INFO] != -1)
12250 + (ids_seen[DW_SECT_TYPES] != -1))
12253 error (_("Dwarf Error: bad DWP hash table, missing/duplicate"
12254 " DWO info/types section [in module %s]"),
12257 /* Must have an abbrev section. */
12258 if (ids_seen[DW_SECT_ABBREV] == -1)
12260 error (_("Dwarf Error: bad DWP hash table, missing DWO abbrev"
12261 " section [in module %s]"),
12264 htab->section_pool.v2.offsets = ids_ptr + sizeof (uint32_t) * nr_columns;
12265 htab->section_pool.v2.sizes =
12266 htab->section_pool.v2.offsets + (sizeof (uint32_t)
12267 * nr_units * nr_columns);
12268 if ((htab->section_pool.v2.sizes + (sizeof (uint32_t)
12269 * nr_units * nr_columns))
12272 error (_("Dwarf Error: DWP index section is corrupt (too small)"
12273 " [in module %s]"),
12281 /* Update SECTIONS with the data from SECTP.
12283 This function is like the other "locate" section routines that are
12284 passed to bfd_map_over_sections, but in this context the sections to
12285 read comes from the DWP V1 hash table, not the full ELF section table.
12287 The result is non-zero for success, or zero if an error was found. */
12290 locate_v1_virtual_dwo_sections (asection *sectp,
12291 struct virtual_v1_dwo_sections *sections)
12293 const struct dwop_section_names *names = &dwop_section_names;
12295 if (section_is_p (sectp->name, &names->abbrev_dwo))
12297 /* There can be only one. */
12298 if (sections->abbrev.s.section != NULL)
12300 sections->abbrev.s.section = sectp;
12301 sections->abbrev.size = bfd_get_section_size (sectp);
12303 else if (section_is_p (sectp->name, &names->info_dwo)
12304 || section_is_p (sectp->name, &names->types_dwo))
12306 /* There can be only one. */
12307 if (sections->info_or_types.s.section != NULL)
12309 sections->info_or_types.s.section = sectp;
12310 sections->info_or_types.size = bfd_get_section_size (sectp);
12312 else if (section_is_p (sectp->name, &names->line_dwo))
12314 /* There can be only one. */
12315 if (sections->line.s.section != NULL)
12317 sections->line.s.section = sectp;
12318 sections->line.size = bfd_get_section_size (sectp);
12320 else if (section_is_p (sectp->name, &names->loc_dwo))
12322 /* There can be only one. */
12323 if (sections->loc.s.section != NULL)
12325 sections->loc.s.section = sectp;
12326 sections->loc.size = bfd_get_section_size (sectp);
12328 else if (section_is_p (sectp->name, &names->macinfo_dwo))
12330 /* There can be only one. */
12331 if (sections->macinfo.s.section != NULL)
12333 sections->macinfo.s.section = sectp;
12334 sections->macinfo.size = bfd_get_section_size (sectp);
12336 else if (section_is_p (sectp->name, &names->macro_dwo))
12338 /* There can be only one. */
12339 if (sections->macro.s.section != NULL)
12341 sections->macro.s.section = sectp;
12342 sections->macro.size = bfd_get_section_size (sectp);
12344 else if (section_is_p (sectp->name, &names->str_offsets_dwo))
12346 /* There can be only one. */
12347 if (sections->str_offsets.s.section != NULL)
12349 sections->str_offsets.s.section = sectp;
12350 sections->str_offsets.size = bfd_get_section_size (sectp);
12354 /* No other kind of section is valid. */
12361 /* Create a dwo_unit object for the DWO unit with signature SIGNATURE.
12362 UNIT_INDEX is the index of the DWO unit in the DWP hash table.
12363 COMP_DIR is the DW_AT_comp_dir attribute of the referencing CU.
12364 This is for DWP version 1 files. */
12366 static struct dwo_unit *
12367 create_dwo_unit_in_dwp_v1 (struct dwp_file *dwp_file,
12368 uint32_t unit_index,
12369 const char *comp_dir,
12370 ULONGEST signature, int is_debug_types)
12372 struct objfile *objfile = dwarf2_per_objfile->objfile;
12373 const struct dwp_hash_table *dwp_htab =
12374 is_debug_types ? dwp_file->tus : dwp_file->cus;
12375 bfd *dbfd = dwp_file->dbfd;
12376 const char *kind = is_debug_types ? "TU" : "CU";
12377 struct dwo_file *dwo_file;
12378 struct dwo_unit *dwo_unit;
12379 struct virtual_v1_dwo_sections sections;
12380 void **dwo_file_slot;
12383 gdb_assert (dwp_file->version == 1);
12385 if (dwarf_read_debug)
12387 fprintf_unfiltered (gdb_stdlog, "Reading %s %s/%s in DWP V1 file: %s\n",
12389 pulongest (unit_index), hex_string (signature),
12393 /* Fetch the sections of this DWO unit.
12394 Put a limit on the number of sections we look for so that bad data
12395 doesn't cause us to loop forever. */
12397 #define MAX_NR_V1_DWO_SECTIONS \
12398 (1 /* .debug_info or .debug_types */ \
12399 + 1 /* .debug_abbrev */ \
12400 + 1 /* .debug_line */ \
12401 + 1 /* .debug_loc */ \
12402 + 1 /* .debug_str_offsets */ \
12403 + 1 /* .debug_macro or .debug_macinfo */ \
12404 + 1 /* trailing zero */)
12406 memset (§ions, 0, sizeof (sections));
12408 for (i = 0; i < MAX_NR_V1_DWO_SECTIONS; ++i)
12411 uint32_t section_nr =
12412 read_4_bytes (dbfd,
12413 dwp_htab->section_pool.v1.indices
12414 + (unit_index + i) * sizeof (uint32_t));
12416 if (section_nr == 0)
12418 if (section_nr >= dwp_file->num_sections)
12420 error (_("Dwarf Error: bad DWP hash table, section number too large"
12421 " [in module %s]"),
12425 sectp = dwp_file->elf_sections[section_nr];
12426 if (! locate_v1_virtual_dwo_sections (sectp, §ions))
12428 error (_("Dwarf Error: bad DWP hash table, invalid section found"
12429 " [in module %s]"),
12435 || dwarf2_section_empty_p (§ions.info_or_types)
12436 || dwarf2_section_empty_p (§ions.abbrev))
12438 error (_("Dwarf Error: bad DWP hash table, missing DWO sections"
12439 " [in module %s]"),
12442 if (i == MAX_NR_V1_DWO_SECTIONS)
12444 error (_("Dwarf Error: bad DWP hash table, too many DWO sections"
12445 " [in module %s]"),
12449 /* It's easier for the rest of the code if we fake a struct dwo_file and
12450 have dwo_unit "live" in that. At least for now.
12452 The DWP file can be made up of a random collection of CUs and TUs.
12453 However, for each CU + set of TUs that came from the same original DWO
12454 file, we can combine them back into a virtual DWO file to save space
12455 (fewer struct dwo_file objects to allocate). Remember that for really
12456 large apps there can be on the order of 8K CUs and 200K TUs, or more. */
12458 std::string virtual_dwo_name =
12459 string_printf ("virtual-dwo/%d-%d-%d-%d",
12460 get_section_id (§ions.abbrev),
12461 get_section_id (§ions.line),
12462 get_section_id (§ions.loc),
12463 get_section_id (§ions.str_offsets));
12464 /* Can we use an existing virtual DWO file? */
12465 dwo_file_slot = lookup_dwo_file_slot (virtual_dwo_name.c_str (), comp_dir);
12466 /* Create one if necessary. */
12467 if (*dwo_file_slot == NULL)
12469 if (dwarf_read_debug)
12471 fprintf_unfiltered (gdb_stdlog, "Creating virtual DWO: %s\n",
12472 virtual_dwo_name.c_str ());
12474 dwo_file = OBSTACK_ZALLOC (&objfile->objfile_obstack, struct dwo_file);
12476 = (const char *) obstack_copy0 (&objfile->objfile_obstack,
12477 virtual_dwo_name.c_str (),
12478 virtual_dwo_name.size ());
12479 dwo_file->comp_dir = comp_dir;
12480 dwo_file->sections.abbrev = sections.abbrev;
12481 dwo_file->sections.line = sections.line;
12482 dwo_file->sections.loc = sections.loc;
12483 dwo_file->sections.macinfo = sections.macinfo;
12484 dwo_file->sections.macro = sections.macro;
12485 dwo_file->sections.str_offsets = sections.str_offsets;
12486 /* The "str" section is global to the entire DWP file. */
12487 dwo_file->sections.str = dwp_file->sections.str;
12488 /* The info or types section is assigned below to dwo_unit,
12489 there's no need to record it in dwo_file.
12490 Also, we can't simply record type sections in dwo_file because
12491 we record a pointer into the vector in dwo_unit. As we collect more
12492 types we'll grow the vector and eventually have to reallocate space
12493 for it, invalidating all copies of pointers into the previous
12495 *dwo_file_slot = dwo_file;
12499 if (dwarf_read_debug)
12501 fprintf_unfiltered (gdb_stdlog, "Using existing virtual DWO: %s\n",
12502 virtual_dwo_name.c_str ());
12504 dwo_file = (struct dwo_file *) *dwo_file_slot;
12507 dwo_unit = OBSTACK_ZALLOC (&objfile->objfile_obstack, struct dwo_unit);
12508 dwo_unit->dwo_file = dwo_file;
12509 dwo_unit->signature = signature;
12510 dwo_unit->section =
12511 XOBNEW (&objfile->objfile_obstack, struct dwarf2_section_info);
12512 *dwo_unit->section = sections.info_or_types;
12513 /* dwo_unit->{offset,length,type_offset_in_tu} are set later. */
12518 /* Subroutine of create_dwo_unit_in_dwp_v2 to simplify it.
12519 Given a pointer to the containing section SECTION, and OFFSET,SIZE of the
12520 piece within that section used by a TU/CU, return a virtual section
12521 of just that piece. */
12523 static struct dwarf2_section_info
12524 create_dwp_v2_section (struct dwarf2_section_info *section,
12525 bfd_size_type offset, bfd_size_type size)
12527 struct dwarf2_section_info result;
12530 gdb_assert (section != NULL);
12531 gdb_assert (!section->is_virtual);
12533 memset (&result, 0, sizeof (result));
12534 result.s.containing_section = section;
12535 result.is_virtual = 1;
12540 sectp = get_section_bfd_section (section);
12542 /* Flag an error if the piece denoted by OFFSET,SIZE is outside the
12543 bounds of the real section. This is a pretty-rare event, so just
12544 flag an error (easier) instead of a warning and trying to cope. */
12546 || offset + size > bfd_get_section_size (sectp))
12548 error (_("Dwarf Error: Bad DWP V2 section info, doesn't fit"
12549 " in section %s [in module %s]"),
12550 sectp ? bfd_section_name (abfd, sectp) : "<unknown>",
12551 objfile_name (dwarf2_per_objfile->objfile));
12554 result.virtual_offset = offset;
12555 result.size = size;
12559 /* Create a dwo_unit object for the DWO unit with signature SIGNATURE.
12560 UNIT_INDEX is the index of the DWO unit in the DWP hash table.
12561 COMP_DIR is the DW_AT_comp_dir attribute of the referencing CU.
12562 This is for DWP version 2 files. */
12564 static struct dwo_unit *
12565 create_dwo_unit_in_dwp_v2 (struct dwp_file *dwp_file,
12566 uint32_t unit_index,
12567 const char *comp_dir,
12568 ULONGEST signature, int is_debug_types)
12570 struct objfile *objfile = dwarf2_per_objfile->objfile;
12571 const struct dwp_hash_table *dwp_htab =
12572 is_debug_types ? dwp_file->tus : dwp_file->cus;
12573 bfd *dbfd = dwp_file->dbfd;
12574 const char *kind = is_debug_types ? "TU" : "CU";
12575 struct dwo_file *dwo_file;
12576 struct dwo_unit *dwo_unit;
12577 struct virtual_v2_dwo_sections sections;
12578 void **dwo_file_slot;
12581 gdb_assert (dwp_file->version == 2);
12583 if (dwarf_read_debug)
12585 fprintf_unfiltered (gdb_stdlog, "Reading %s %s/%s in DWP V2 file: %s\n",
12587 pulongest (unit_index), hex_string (signature),
12591 /* Fetch the section offsets of this DWO unit. */
12593 memset (§ions, 0, sizeof (sections));
12595 for (i = 0; i < dwp_htab->nr_columns; ++i)
12597 uint32_t offset = read_4_bytes (dbfd,
12598 dwp_htab->section_pool.v2.offsets
12599 + (((unit_index - 1) * dwp_htab->nr_columns
12601 * sizeof (uint32_t)));
12602 uint32_t size = read_4_bytes (dbfd,
12603 dwp_htab->section_pool.v2.sizes
12604 + (((unit_index - 1) * dwp_htab->nr_columns
12606 * sizeof (uint32_t)));
12608 switch (dwp_htab->section_pool.v2.section_ids[i])
12611 case DW_SECT_TYPES:
12612 sections.info_or_types_offset = offset;
12613 sections.info_or_types_size = size;
12615 case DW_SECT_ABBREV:
12616 sections.abbrev_offset = offset;
12617 sections.abbrev_size = size;
12620 sections.line_offset = offset;
12621 sections.line_size = size;
12624 sections.loc_offset = offset;
12625 sections.loc_size = size;
12627 case DW_SECT_STR_OFFSETS:
12628 sections.str_offsets_offset = offset;
12629 sections.str_offsets_size = size;
12631 case DW_SECT_MACINFO:
12632 sections.macinfo_offset = offset;
12633 sections.macinfo_size = size;
12635 case DW_SECT_MACRO:
12636 sections.macro_offset = offset;
12637 sections.macro_size = size;
12642 /* It's easier for the rest of the code if we fake a struct dwo_file and
12643 have dwo_unit "live" in that. At least for now.
12645 The DWP file can be made up of a random collection of CUs and TUs.
12646 However, for each CU + set of TUs that came from the same original DWO
12647 file, we can combine them back into a virtual DWO file to save space
12648 (fewer struct dwo_file objects to allocate). Remember that for really
12649 large apps there can be on the order of 8K CUs and 200K TUs, or more. */
12651 std::string virtual_dwo_name =
12652 string_printf ("virtual-dwo/%ld-%ld-%ld-%ld",
12653 (long) (sections.abbrev_size ? sections.abbrev_offset : 0),
12654 (long) (sections.line_size ? sections.line_offset : 0),
12655 (long) (sections.loc_size ? sections.loc_offset : 0),
12656 (long) (sections.str_offsets_size
12657 ? sections.str_offsets_offset : 0));
12658 /* Can we use an existing virtual DWO file? */
12659 dwo_file_slot = lookup_dwo_file_slot (virtual_dwo_name.c_str (), comp_dir);
12660 /* Create one if necessary. */
12661 if (*dwo_file_slot == NULL)
12663 if (dwarf_read_debug)
12665 fprintf_unfiltered (gdb_stdlog, "Creating virtual DWO: %s\n",
12666 virtual_dwo_name.c_str ());
12668 dwo_file = OBSTACK_ZALLOC (&objfile->objfile_obstack, struct dwo_file);
12670 = (const char *) obstack_copy0 (&objfile->objfile_obstack,
12671 virtual_dwo_name.c_str (),
12672 virtual_dwo_name.size ());
12673 dwo_file->comp_dir = comp_dir;
12674 dwo_file->sections.abbrev =
12675 create_dwp_v2_section (&dwp_file->sections.abbrev,
12676 sections.abbrev_offset, sections.abbrev_size);
12677 dwo_file->sections.line =
12678 create_dwp_v2_section (&dwp_file->sections.line,
12679 sections.line_offset, sections.line_size);
12680 dwo_file->sections.loc =
12681 create_dwp_v2_section (&dwp_file->sections.loc,
12682 sections.loc_offset, sections.loc_size);
12683 dwo_file->sections.macinfo =
12684 create_dwp_v2_section (&dwp_file->sections.macinfo,
12685 sections.macinfo_offset, sections.macinfo_size);
12686 dwo_file->sections.macro =
12687 create_dwp_v2_section (&dwp_file->sections.macro,
12688 sections.macro_offset, sections.macro_size);
12689 dwo_file->sections.str_offsets =
12690 create_dwp_v2_section (&dwp_file->sections.str_offsets,
12691 sections.str_offsets_offset,
12692 sections.str_offsets_size);
12693 /* The "str" section is global to the entire DWP file. */
12694 dwo_file->sections.str = dwp_file->sections.str;
12695 /* The info or types section is assigned below to dwo_unit,
12696 there's no need to record it in dwo_file.
12697 Also, we can't simply record type sections in dwo_file because
12698 we record a pointer into the vector in dwo_unit. As we collect more
12699 types we'll grow the vector and eventually have to reallocate space
12700 for it, invalidating all copies of pointers into the previous
12702 *dwo_file_slot = dwo_file;
12706 if (dwarf_read_debug)
12708 fprintf_unfiltered (gdb_stdlog, "Using existing virtual DWO: %s\n",
12709 virtual_dwo_name.c_str ());
12711 dwo_file = (struct dwo_file *) *dwo_file_slot;
12714 dwo_unit = OBSTACK_ZALLOC (&objfile->objfile_obstack, struct dwo_unit);
12715 dwo_unit->dwo_file = dwo_file;
12716 dwo_unit->signature = signature;
12717 dwo_unit->section =
12718 XOBNEW (&objfile->objfile_obstack, struct dwarf2_section_info);
12719 *dwo_unit->section = create_dwp_v2_section (is_debug_types
12720 ? &dwp_file->sections.types
12721 : &dwp_file->sections.info,
12722 sections.info_or_types_offset,
12723 sections.info_or_types_size);
12724 /* dwo_unit->{offset,length,type_offset_in_tu} are set later. */
12729 /* Lookup the DWO unit with SIGNATURE in DWP_FILE.
12730 Returns NULL if the signature isn't found. */
12732 static struct dwo_unit *
12733 lookup_dwo_unit_in_dwp (struct dwp_file *dwp_file, const char *comp_dir,
12734 ULONGEST signature, int is_debug_types)
12736 const struct dwp_hash_table *dwp_htab =
12737 is_debug_types ? dwp_file->tus : dwp_file->cus;
12738 bfd *dbfd = dwp_file->dbfd;
12739 uint32_t mask = dwp_htab->nr_slots - 1;
12740 uint32_t hash = signature & mask;
12741 uint32_t hash2 = ((signature >> 32) & mask) | 1;
12744 struct dwo_unit find_dwo_cu;
12746 memset (&find_dwo_cu, 0, sizeof (find_dwo_cu));
12747 find_dwo_cu.signature = signature;
12748 slot = htab_find_slot (is_debug_types
12749 ? dwp_file->loaded_tus
12750 : dwp_file->loaded_cus,
12751 &find_dwo_cu, INSERT);
12754 return (struct dwo_unit *) *slot;
12756 /* Use a for loop so that we don't loop forever on bad debug info. */
12757 for (i = 0; i < dwp_htab->nr_slots; ++i)
12759 ULONGEST signature_in_table;
12761 signature_in_table =
12762 read_8_bytes (dbfd, dwp_htab->hash_table + hash * sizeof (uint64_t));
12763 if (signature_in_table == signature)
12765 uint32_t unit_index =
12766 read_4_bytes (dbfd,
12767 dwp_htab->unit_table + hash * sizeof (uint32_t));
12769 if (dwp_file->version == 1)
12771 *slot = create_dwo_unit_in_dwp_v1 (dwp_file, unit_index,
12772 comp_dir, signature,
12777 *slot = create_dwo_unit_in_dwp_v2 (dwp_file, unit_index,
12778 comp_dir, signature,
12781 return (struct dwo_unit *) *slot;
12783 if (signature_in_table == 0)
12785 hash = (hash + hash2) & mask;
12788 error (_("Dwarf Error: bad DWP hash table, lookup didn't terminate"
12789 " [in module %s]"),
12793 /* Subroutine of open_dwo_file,open_dwp_file to simplify them.
12794 Open the file specified by FILE_NAME and hand it off to BFD for
12795 preliminary analysis. Return a newly initialized bfd *, which
12796 includes a canonicalized copy of FILE_NAME.
12797 If IS_DWP is TRUE, we're opening a DWP file, otherwise a DWO file.
12798 SEARCH_CWD is true if the current directory is to be searched.
12799 It will be searched before debug-file-directory.
12800 If successful, the file is added to the bfd include table of the
12801 objfile's bfd (see gdb_bfd_record_inclusion).
12802 If unable to find/open the file, return NULL.
12803 NOTE: This function is derived from symfile_bfd_open. */
12805 static gdb_bfd_ref_ptr
12806 try_open_dwop_file (const char *file_name, int is_dwp, int search_cwd)
12809 char *absolute_name;
12810 /* Blech. OPF_TRY_CWD_FIRST also disables searching the path list if
12811 FILE_NAME contains a '/'. So we can't use it. Instead prepend "."
12812 to debug_file_directory. */
12814 static const char dirname_separator_string[] = { DIRNAME_SEPARATOR, '\0' };
12818 if (*debug_file_directory != '\0')
12819 search_path = concat (".", dirname_separator_string,
12820 debug_file_directory, (char *) NULL);
12822 search_path = xstrdup (".");
12825 search_path = xstrdup (debug_file_directory);
12827 flags = OPF_RETURN_REALPATH;
12829 flags |= OPF_SEARCH_IN_PATH;
12830 desc = openp (search_path, flags, file_name,
12831 O_RDONLY | O_BINARY, &absolute_name);
12832 xfree (search_path);
12836 gdb_bfd_ref_ptr sym_bfd (gdb_bfd_open (absolute_name, gnutarget, desc));
12837 xfree (absolute_name);
12838 if (sym_bfd == NULL)
12840 bfd_set_cacheable (sym_bfd.get (), 1);
12842 if (!bfd_check_format (sym_bfd.get (), bfd_object))
12845 /* Success. Record the bfd as having been included by the objfile's bfd.
12846 This is important because things like demangled_names_hash lives in the
12847 objfile's per_bfd space and may have references to things like symbol
12848 names that live in the DWO/DWP file's per_bfd space. PR 16426. */
12849 gdb_bfd_record_inclusion (dwarf2_per_objfile->objfile->obfd, sym_bfd.get ());
12854 /* Try to open DWO file FILE_NAME.
12855 COMP_DIR is the DW_AT_comp_dir attribute.
12856 The result is the bfd handle of the file.
12857 If there is a problem finding or opening the file, return NULL.
12858 Upon success, the canonicalized path of the file is stored in the bfd,
12859 same as symfile_bfd_open. */
12861 static gdb_bfd_ref_ptr
12862 open_dwo_file (const char *file_name, const char *comp_dir)
12864 if (IS_ABSOLUTE_PATH (file_name))
12865 return try_open_dwop_file (file_name, 0 /*is_dwp*/, 0 /*search_cwd*/);
12867 /* Before trying the search path, try DWO_NAME in COMP_DIR. */
12869 if (comp_dir != NULL)
12871 char *path_to_try = concat (comp_dir, SLASH_STRING,
12872 file_name, (char *) NULL);
12874 /* NOTE: If comp_dir is a relative path, this will also try the
12875 search path, which seems useful. */
12876 gdb_bfd_ref_ptr abfd (try_open_dwop_file (path_to_try, 0 /*is_dwp*/,
12877 1 /*search_cwd*/));
12878 xfree (path_to_try);
12883 /* That didn't work, try debug-file-directory, which, despite its name,
12884 is a list of paths. */
12886 if (*debug_file_directory == '\0')
12889 return try_open_dwop_file (file_name, 0 /*is_dwp*/, 1 /*search_cwd*/);
12892 /* This function is mapped across the sections and remembers the offset and
12893 size of each of the DWO debugging sections we are interested in. */
12896 dwarf2_locate_dwo_sections (bfd *abfd, asection *sectp, void *dwo_sections_ptr)
12898 struct dwo_sections *dwo_sections = (struct dwo_sections *) dwo_sections_ptr;
12899 const struct dwop_section_names *names = &dwop_section_names;
12901 if (section_is_p (sectp->name, &names->abbrev_dwo))
12903 dwo_sections->abbrev.s.section = sectp;
12904 dwo_sections->abbrev.size = bfd_get_section_size (sectp);
12906 else if (section_is_p (sectp->name, &names->info_dwo))
12908 dwo_sections->info.s.section = sectp;
12909 dwo_sections->info.size = bfd_get_section_size (sectp);
12911 else if (section_is_p (sectp->name, &names->line_dwo))
12913 dwo_sections->line.s.section = sectp;
12914 dwo_sections->line.size = bfd_get_section_size (sectp);
12916 else if (section_is_p (sectp->name, &names->loc_dwo))
12918 dwo_sections->loc.s.section = sectp;
12919 dwo_sections->loc.size = bfd_get_section_size (sectp);
12921 else if (section_is_p (sectp->name, &names->macinfo_dwo))
12923 dwo_sections->macinfo.s.section = sectp;
12924 dwo_sections->macinfo.size = bfd_get_section_size (sectp);
12926 else if (section_is_p (sectp->name, &names->macro_dwo))
12928 dwo_sections->macro.s.section = sectp;
12929 dwo_sections->macro.size = bfd_get_section_size (sectp);
12931 else if (section_is_p (sectp->name, &names->str_dwo))
12933 dwo_sections->str.s.section = sectp;
12934 dwo_sections->str.size = bfd_get_section_size (sectp);
12936 else if (section_is_p (sectp->name, &names->str_offsets_dwo))
12938 dwo_sections->str_offsets.s.section = sectp;
12939 dwo_sections->str_offsets.size = bfd_get_section_size (sectp);
12941 else if (section_is_p (sectp->name, &names->types_dwo))
12943 struct dwarf2_section_info type_section;
12945 memset (&type_section, 0, sizeof (type_section));
12946 type_section.s.section = sectp;
12947 type_section.size = bfd_get_section_size (sectp);
12948 VEC_safe_push (dwarf2_section_info_def, dwo_sections->types,
12953 /* Initialize the use of the DWO file specified by DWO_NAME and referenced
12954 by PER_CU. This is for the non-DWP case.
12955 The result is NULL if DWO_NAME can't be found. */
12957 static struct dwo_file *
12958 open_and_init_dwo_file (struct dwarf2_per_cu_data *per_cu,
12959 const char *dwo_name, const char *comp_dir)
12961 struct objfile *objfile = dwarf2_per_objfile->objfile;
12962 struct dwo_file *dwo_file;
12963 struct cleanup *cleanups;
12965 gdb_bfd_ref_ptr dbfd (open_dwo_file (dwo_name, comp_dir));
12968 if (dwarf_read_debug)
12969 fprintf_unfiltered (gdb_stdlog, "DWO file not found: %s\n", dwo_name);
12972 dwo_file = OBSTACK_ZALLOC (&objfile->objfile_obstack, struct dwo_file);
12973 dwo_file->dwo_name = dwo_name;
12974 dwo_file->comp_dir = comp_dir;
12975 dwo_file->dbfd = dbfd.release ();
12977 cleanups = make_cleanup (free_dwo_file_cleanup, dwo_file);
12979 bfd_map_over_sections (dwo_file->dbfd, dwarf2_locate_dwo_sections,
12980 &dwo_file->sections);
12982 create_cus_hash_table (*dwo_file, dwo_file->sections.info, dwo_file->cus);
12984 create_debug_types_hash_table (dwo_file, dwo_file->sections.types,
12987 discard_cleanups (cleanups);
12989 if (dwarf_read_debug)
12990 fprintf_unfiltered (gdb_stdlog, "DWO file found: %s\n", dwo_name);
12995 /* This function is mapped across the sections and remembers the offset and
12996 size of each of the DWP debugging sections common to version 1 and 2 that
12997 we are interested in. */
13000 dwarf2_locate_common_dwp_sections (bfd *abfd, asection *sectp,
13001 void *dwp_file_ptr)
13003 struct dwp_file *dwp_file = (struct dwp_file *) dwp_file_ptr;
13004 const struct dwop_section_names *names = &dwop_section_names;
13005 unsigned int elf_section_nr = elf_section_data (sectp)->this_idx;
13007 /* Record the ELF section number for later lookup: this is what the
13008 .debug_cu_index,.debug_tu_index tables use in DWP V1. */
13009 gdb_assert (elf_section_nr < dwp_file->num_sections);
13010 dwp_file->elf_sections[elf_section_nr] = sectp;
13012 /* Look for specific sections that we need. */
13013 if (section_is_p (sectp->name, &names->str_dwo))
13015 dwp_file->sections.str.s.section = sectp;
13016 dwp_file->sections.str.size = bfd_get_section_size (sectp);
13018 else if (section_is_p (sectp->name, &names->cu_index))
13020 dwp_file->sections.cu_index.s.section = sectp;
13021 dwp_file->sections.cu_index.size = bfd_get_section_size (sectp);
13023 else if (section_is_p (sectp->name, &names->tu_index))
13025 dwp_file->sections.tu_index.s.section = sectp;
13026 dwp_file->sections.tu_index.size = bfd_get_section_size (sectp);
13030 /* This function is mapped across the sections and remembers the offset and
13031 size of each of the DWP version 2 debugging sections that we are interested
13032 in. This is split into a separate function because we don't know if we
13033 have version 1 or 2 until we parse the cu_index/tu_index sections. */
13036 dwarf2_locate_v2_dwp_sections (bfd *abfd, asection *sectp, void *dwp_file_ptr)
13038 struct dwp_file *dwp_file = (struct dwp_file *) dwp_file_ptr;
13039 const struct dwop_section_names *names = &dwop_section_names;
13040 unsigned int elf_section_nr = elf_section_data (sectp)->this_idx;
13042 /* Record the ELF section number for later lookup: this is what the
13043 .debug_cu_index,.debug_tu_index tables use in DWP V1. */
13044 gdb_assert (elf_section_nr < dwp_file->num_sections);
13045 dwp_file->elf_sections[elf_section_nr] = sectp;
13047 /* Look for specific sections that we need. */
13048 if (section_is_p (sectp->name, &names->abbrev_dwo))
13050 dwp_file->sections.abbrev.s.section = sectp;
13051 dwp_file->sections.abbrev.size = bfd_get_section_size (sectp);
13053 else if (section_is_p (sectp->name, &names->info_dwo))
13055 dwp_file->sections.info.s.section = sectp;
13056 dwp_file->sections.info.size = bfd_get_section_size (sectp);
13058 else if (section_is_p (sectp->name, &names->line_dwo))
13060 dwp_file->sections.line.s.section = sectp;
13061 dwp_file->sections.line.size = bfd_get_section_size (sectp);
13063 else if (section_is_p (sectp->name, &names->loc_dwo))
13065 dwp_file->sections.loc.s.section = sectp;
13066 dwp_file->sections.loc.size = bfd_get_section_size (sectp);
13068 else if (section_is_p (sectp->name, &names->macinfo_dwo))
13070 dwp_file->sections.macinfo.s.section = sectp;
13071 dwp_file->sections.macinfo.size = bfd_get_section_size (sectp);
13073 else if (section_is_p (sectp->name, &names->macro_dwo))
13075 dwp_file->sections.macro.s.section = sectp;
13076 dwp_file->sections.macro.size = bfd_get_section_size (sectp);
13078 else if (section_is_p (sectp->name, &names->str_offsets_dwo))
13080 dwp_file->sections.str_offsets.s.section = sectp;
13081 dwp_file->sections.str_offsets.size = bfd_get_section_size (sectp);
13083 else if (section_is_p (sectp->name, &names->types_dwo))
13085 dwp_file->sections.types.s.section = sectp;
13086 dwp_file->sections.types.size = bfd_get_section_size (sectp);
13090 /* Hash function for dwp_file loaded CUs/TUs. */
13093 hash_dwp_loaded_cutus (const void *item)
13095 const struct dwo_unit *dwo_unit = (const struct dwo_unit *) item;
13097 /* This drops the top 32 bits of the signature, but is ok for a hash. */
13098 return dwo_unit->signature;
13101 /* Equality function for dwp_file loaded CUs/TUs. */
13104 eq_dwp_loaded_cutus (const void *a, const void *b)
13106 const struct dwo_unit *dua = (const struct dwo_unit *) a;
13107 const struct dwo_unit *dub = (const struct dwo_unit *) b;
13109 return dua->signature == dub->signature;
13112 /* Allocate a hash table for dwp_file loaded CUs/TUs. */
13115 allocate_dwp_loaded_cutus_table (struct objfile *objfile)
13117 return htab_create_alloc_ex (3,
13118 hash_dwp_loaded_cutus,
13119 eq_dwp_loaded_cutus,
13121 &objfile->objfile_obstack,
13122 hashtab_obstack_allocate,
13123 dummy_obstack_deallocate);
13126 /* Try to open DWP file FILE_NAME.
13127 The result is the bfd handle of the file.
13128 If there is a problem finding or opening the file, return NULL.
13129 Upon success, the canonicalized path of the file is stored in the bfd,
13130 same as symfile_bfd_open. */
13132 static gdb_bfd_ref_ptr
13133 open_dwp_file (const char *file_name)
13135 gdb_bfd_ref_ptr abfd (try_open_dwop_file (file_name, 1 /*is_dwp*/,
13136 1 /*search_cwd*/));
13140 /* Work around upstream bug 15652.
13141 http://sourceware.org/bugzilla/show_bug.cgi?id=15652
13142 [Whether that's a "bug" is debatable, but it is getting in our way.]
13143 We have no real idea where the dwp file is, because gdb's realpath-ing
13144 of the executable's path may have discarded the needed info.
13145 [IWBN if the dwp file name was recorded in the executable, akin to
13146 .gnu_debuglink, but that doesn't exist yet.]
13147 Strip the directory from FILE_NAME and search again. */
13148 if (*debug_file_directory != '\0')
13150 /* Don't implicitly search the current directory here.
13151 If the user wants to search "." to handle this case,
13152 it must be added to debug-file-directory. */
13153 return try_open_dwop_file (lbasename (file_name), 1 /*is_dwp*/,
13160 /* Initialize the use of the DWP file for the current objfile.
13161 By convention the name of the DWP file is ${objfile}.dwp.
13162 The result is NULL if it can't be found. */
13164 static struct dwp_file *
13165 open_and_init_dwp_file (void)
13167 struct objfile *objfile = dwarf2_per_objfile->objfile;
13168 struct dwp_file *dwp_file;
13170 /* Try to find first .dwp for the binary file before any symbolic links
13173 /* If the objfile is a debug file, find the name of the real binary
13174 file and get the name of dwp file from there. */
13175 std::string dwp_name;
13176 if (objfile->separate_debug_objfile_backlink != NULL)
13178 struct objfile *backlink = objfile->separate_debug_objfile_backlink;
13179 const char *backlink_basename = lbasename (backlink->original_name);
13181 dwp_name = ldirname (objfile->original_name) + SLASH_STRING + backlink_basename;
13184 dwp_name = objfile->original_name;
13186 dwp_name += ".dwp";
13188 gdb_bfd_ref_ptr dbfd (open_dwp_file (dwp_name.c_str ()));
13190 && strcmp (objfile->original_name, objfile_name (objfile)) != 0)
13192 /* Try to find .dwp for the binary file after gdb_realpath resolving. */
13193 dwp_name = objfile_name (objfile);
13194 dwp_name += ".dwp";
13195 dbfd = open_dwp_file (dwp_name.c_str ());
13200 if (dwarf_read_debug)
13201 fprintf_unfiltered (gdb_stdlog, "DWP file not found: %s\n", dwp_name.c_str ());
13204 dwp_file = OBSTACK_ZALLOC (&objfile->objfile_obstack, struct dwp_file);
13205 dwp_file->name = bfd_get_filename (dbfd.get ());
13206 dwp_file->dbfd = dbfd.release ();
13208 /* +1: section 0 is unused */
13209 dwp_file->num_sections = bfd_count_sections (dwp_file->dbfd) + 1;
13210 dwp_file->elf_sections =
13211 OBSTACK_CALLOC (&objfile->objfile_obstack,
13212 dwp_file->num_sections, asection *);
13214 bfd_map_over_sections (dwp_file->dbfd, dwarf2_locate_common_dwp_sections,
13217 dwp_file->cus = create_dwp_hash_table (dwp_file, 0);
13219 dwp_file->tus = create_dwp_hash_table (dwp_file, 1);
13221 /* The DWP file version is stored in the hash table. Oh well. */
13222 if (dwp_file->cus && dwp_file->tus
13223 && dwp_file->cus->version != dwp_file->tus->version)
13225 /* Technically speaking, we should try to limp along, but this is
13226 pretty bizarre. We use pulongest here because that's the established
13227 portability solution (e.g, we cannot use %u for uint32_t). */
13228 error (_("Dwarf Error: DWP file CU version %s doesn't match"
13229 " TU version %s [in DWP file %s]"),
13230 pulongest (dwp_file->cus->version),
13231 pulongest (dwp_file->tus->version), dwp_name.c_str ());
13235 dwp_file->version = dwp_file->cus->version;
13236 else if (dwp_file->tus)
13237 dwp_file->version = dwp_file->tus->version;
13239 dwp_file->version = 2;
13241 if (dwp_file->version == 2)
13242 bfd_map_over_sections (dwp_file->dbfd, dwarf2_locate_v2_dwp_sections,
13245 dwp_file->loaded_cus = allocate_dwp_loaded_cutus_table (objfile);
13246 dwp_file->loaded_tus = allocate_dwp_loaded_cutus_table (objfile);
13248 if (dwarf_read_debug)
13250 fprintf_unfiltered (gdb_stdlog, "DWP file found: %s\n", dwp_file->name);
13251 fprintf_unfiltered (gdb_stdlog,
13252 " %s CUs, %s TUs\n",
13253 pulongest (dwp_file->cus ? dwp_file->cus->nr_units : 0),
13254 pulongest (dwp_file->tus ? dwp_file->tus->nr_units : 0));
13260 /* Wrapper around open_and_init_dwp_file, only open it once. */
13262 static struct dwp_file *
13263 get_dwp_file (void)
13265 if (! dwarf2_per_objfile->dwp_checked)
13267 dwarf2_per_objfile->dwp_file = open_and_init_dwp_file ();
13268 dwarf2_per_objfile->dwp_checked = 1;
13270 return dwarf2_per_objfile->dwp_file;
13273 /* Subroutine of lookup_dwo_comp_unit, lookup_dwo_type_unit.
13274 Look up the CU/TU with signature SIGNATURE, either in DWO file DWO_NAME
13275 or in the DWP file for the objfile, referenced by THIS_UNIT.
13276 If non-NULL, comp_dir is the DW_AT_comp_dir attribute.
13277 IS_DEBUG_TYPES is non-zero if reading a TU, otherwise read a CU.
13279 This is called, for example, when wanting to read a variable with a
13280 complex location. Therefore we don't want to do file i/o for every call.
13281 Therefore we don't want to look for a DWO file on every call.
13282 Therefore we first see if we've already seen SIGNATURE in a DWP file,
13283 then we check if we've already seen DWO_NAME, and only THEN do we check
13286 The result is a pointer to the dwo_unit object or NULL if we didn't find it
13287 (dwo_id mismatch or couldn't find the DWO/DWP file). */
13289 static struct dwo_unit *
13290 lookup_dwo_cutu (struct dwarf2_per_cu_data *this_unit,
13291 const char *dwo_name, const char *comp_dir,
13292 ULONGEST signature, int is_debug_types)
13294 struct objfile *objfile = dwarf2_per_objfile->objfile;
13295 const char *kind = is_debug_types ? "TU" : "CU";
13296 void **dwo_file_slot;
13297 struct dwo_file *dwo_file;
13298 struct dwp_file *dwp_file;
13300 /* First see if there's a DWP file.
13301 If we have a DWP file but didn't find the DWO inside it, don't
13302 look for the original DWO file. It makes gdb behave differently
13303 depending on whether one is debugging in the build tree. */
13305 dwp_file = get_dwp_file ();
13306 if (dwp_file != NULL)
13308 const struct dwp_hash_table *dwp_htab =
13309 is_debug_types ? dwp_file->tus : dwp_file->cus;
13311 if (dwp_htab != NULL)
13313 struct dwo_unit *dwo_cutu =
13314 lookup_dwo_unit_in_dwp (dwp_file, comp_dir,
13315 signature, is_debug_types);
13317 if (dwo_cutu != NULL)
13319 if (dwarf_read_debug)
13321 fprintf_unfiltered (gdb_stdlog,
13322 "Virtual DWO %s %s found: @%s\n",
13323 kind, hex_string (signature),
13324 host_address_to_string (dwo_cutu));
13332 /* No DWP file, look for the DWO file. */
13334 dwo_file_slot = lookup_dwo_file_slot (dwo_name, comp_dir);
13335 if (*dwo_file_slot == NULL)
13337 /* Read in the file and build a table of the CUs/TUs it contains. */
13338 *dwo_file_slot = open_and_init_dwo_file (this_unit, dwo_name, comp_dir);
13340 /* NOTE: This will be NULL if unable to open the file. */
13341 dwo_file = (struct dwo_file *) *dwo_file_slot;
13343 if (dwo_file != NULL)
13345 struct dwo_unit *dwo_cutu = NULL;
13347 if (is_debug_types && dwo_file->tus)
13349 struct dwo_unit find_dwo_cutu;
13351 memset (&find_dwo_cutu, 0, sizeof (find_dwo_cutu));
13352 find_dwo_cutu.signature = signature;
13354 = (struct dwo_unit *) htab_find (dwo_file->tus, &find_dwo_cutu);
13356 else if (!is_debug_types && dwo_file->cus)
13358 struct dwo_unit find_dwo_cutu;
13360 memset (&find_dwo_cutu, 0, sizeof (find_dwo_cutu));
13361 find_dwo_cutu.signature = signature;
13362 dwo_cutu = (struct dwo_unit *)htab_find (dwo_file->cus,
13366 if (dwo_cutu != NULL)
13368 if (dwarf_read_debug)
13370 fprintf_unfiltered (gdb_stdlog, "DWO %s %s(%s) found: @%s\n",
13371 kind, dwo_name, hex_string (signature),
13372 host_address_to_string (dwo_cutu));
13379 /* We didn't find it. This could mean a dwo_id mismatch, or
13380 someone deleted the DWO/DWP file, or the search path isn't set up
13381 correctly to find the file. */
13383 if (dwarf_read_debug)
13385 fprintf_unfiltered (gdb_stdlog, "DWO %s %s(%s) not found\n",
13386 kind, dwo_name, hex_string (signature));
13389 /* This is a warning and not a complaint because it can be caused by
13390 pilot error (e.g., user accidentally deleting the DWO). */
13392 /* Print the name of the DWP file if we looked there, helps the user
13393 better diagnose the problem. */
13394 std::string dwp_text;
13396 if (dwp_file != NULL)
13397 dwp_text = string_printf (" [in DWP file %s]",
13398 lbasename (dwp_file->name));
13400 warning (_("Could not find DWO %s %s(%s)%s referenced by %s at offset 0x%x"
13401 " [in module %s]"),
13402 kind, dwo_name, hex_string (signature),
13404 this_unit->is_debug_types ? "TU" : "CU",
13405 to_underlying (this_unit->sect_off), objfile_name (objfile));
13410 /* Lookup the DWO CU DWO_NAME/SIGNATURE referenced from THIS_CU.
13411 See lookup_dwo_cutu_unit for details. */
13413 static struct dwo_unit *
13414 lookup_dwo_comp_unit (struct dwarf2_per_cu_data *this_cu,
13415 const char *dwo_name, const char *comp_dir,
13416 ULONGEST signature)
13418 return lookup_dwo_cutu (this_cu, dwo_name, comp_dir, signature, 0);
13421 /* Lookup the DWO TU DWO_NAME/SIGNATURE referenced from THIS_TU.
13422 See lookup_dwo_cutu_unit for details. */
13424 static struct dwo_unit *
13425 lookup_dwo_type_unit (struct signatured_type *this_tu,
13426 const char *dwo_name, const char *comp_dir)
13428 return lookup_dwo_cutu (&this_tu->per_cu, dwo_name, comp_dir, this_tu->signature, 1);
13431 /* Traversal function for queue_and_load_all_dwo_tus. */
13434 queue_and_load_dwo_tu (void **slot, void *info)
13436 struct dwo_unit *dwo_unit = (struct dwo_unit *) *slot;
13437 struct dwarf2_per_cu_data *per_cu = (struct dwarf2_per_cu_data *) info;
13438 ULONGEST signature = dwo_unit->signature;
13439 struct signatured_type *sig_type =
13440 lookup_dwo_signatured_type (per_cu->cu, signature);
13442 if (sig_type != NULL)
13444 struct dwarf2_per_cu_data *sig_cu = &sig_type->per_cu;
13446 /* We pass NULL for DEPENDENT_CU because we don't yet know if there's
13447 a real dependency of PER_CU on SIG_TYPE. That is detected later
13448 while processing PER_CU. */
13449 if (maybe_queue_comp_unit (NULL, sig_cu, per_cu->cu->language))
13450 load_full_type_unit (sig_cu);
13451 VEC_safe_push (dwarf2_per_cu_ptr, per_cu->imported_symtabs, sig_cu);
13457 /* Queue all TUs contained in the DWO of PER_CU to be read in.
13458 The DWO may have the only definition of the type, though it may not be
13459 referenced anywhere in PER_CU. Thus we have to load *all* its TUs.
13460 http://sourceware.org/bugzilla/show_bug.cgi?id=15021 */
13463 queue_and_load_all_dwo_tus (struct dwarf2_per_cu_data *per_cu)
13465 struct dwo_unit *dwo_unit;
13466 struct dwo_file *dwo_file;
13468 gdb_assert (!per_cu->is_debug_types);
13469 gdb_assert (get_dwp_file () == NULL);
13470 gdb_assert (per_cu->cu != NULL);
13472 dwo_unit = per_cu->cu->dwo_unit;
13473 gdb_assert (dwo_unit != NULL);
13475 dwo_file = dwo_unit->dwo_file;
13476 if (dwo_file->tus != NULL)
13477 htab_traverse_noresize (dwo_file->tus, queue_and_load_dwo_tu, per_cu);
13480 /* Free all resources associated with DWO_FILE.
13481 Close the DWO file and munmap the sections.
13482 All memory should be on the objfile obstack. */
13485 free_dwo_file (struct dwo_file *dwo_file, struct objfile *objfile)
13488 /* Note: dbfd is NULL for virtual DWO files. */
13489 gdb_bfd_unref (dwo_file->dbfd);
13491 VEC_free (dwarf2_section_info_def, dwo_file->sections.types);
13494 /* Wrapper for free_dwo_file for use in cleanups. */
13497 free_dwo_file_cleanup (void *arg)
13499 struct dwo_file *dwo_file = (struct dwo_file *) arg;
13500 struct objfile *objfile = dwarf2_per_objfile->objfile;
13502 free_dwo_file (dwo_file, objfile);
13505 /* Traversal function for free_dwo_files. */
13508 free_dwo_file_from_slot (void **slot, void *info)
13510 struct dwo_file *dwo_file = (struct dwo_file *) *slot;
13511 struct objfile *objfile = (struct objfile *) info;
13513 free_dwo_file (dwo_file, objfile);
13518 /* Free all resources associated with DWO_FILES. */
13521 free_dwo_files (htab_t dwo_files, struct objfile *objfile)
13523 htab_traverse_noresize (dwo_files, free_dwo_file_from_slot, objfile);
13526 /* Read in various DIEs. */
13528 /* DW_AT_abstract_origin inherits whole DIEs (not just their attributes).
13529 Inherit only the children of the DW_AT_abstract_origin DIE not being
13530 already referenced by DW_AT_abstract_origin from the children of the
13534 inherit_abstract_dies (struct die_info *die, struct dwarf2_cu *cu)
13536 struct die_info *child_die;
13537 sect_offset *offsetp;
13538 /* Parent of DIE - referenced by DW_AT_abstract_origin. */
13539 struct die_info *origin_die;
13540 /* Iterator of the ORIGIN_DIE children. */
13541 struct die_info *origin_child_die;
13542 struct attribute *attr;
13543 struct dwarf2_cu *origin_cu;
13544 struct pending **origin_previous_list_in_scope;
13546 attr = dwarf2_attr (die, DW_AT_abstract_origin, cu);
13550 /* Note that following die references may follow to a die in a
13554 origin_die = follow_die_ref (die, attr, &origin_cu);
13556 /* We're inheriting ORIGIN's children into the scope we'd put DIE's
13558 origin_previous_list_in_scope = origin_cu->list_in_scope;
13559 origin_cu->list_in_scope = cu->list_in_scope;
13561 if (die->tag != origin_die->tag
13562 && !(die->tag == DW_TAG_inlined_subroutine
13563 && origin_die->tag == DW_TAG_subprogram))
13564 complaint (&symfile_complaints,
13565 _("DIE 0x%x and its abstract origin 0x%x have different tags"),
13566 to_underlying (die->sect_off),
13567 to_underlying (origin_die->sect_off));
13569 std::vector<sect_offset> offsets;
13571 for (child_die = die->child;
13572 child_die && child_die->tag;
13573 child_die = sibling_die (child_die))
13575 struct die_info *child_origin_die;
13576 struct dwarf2_cu *child_origin_cu;
13578 /* We are trying to process concrete instance entries:
13579 DW_TAG_call_site DIEs indeed have a DW_AT_abstract_origin tag, but
13580 it's not relevant to our analysis here. i.e. detecting DIEs that are
13581 present in the abstract instance but not referenced in the concrete
13583 if (child_die->tag == DW_TAG_call_site
13584 || child_die->tag == DW_TAG_GNU_call_site)
13587 /* For each CHILD_DIE, find the corresponding child of
13588 ORIGIN_DIE. If there is more than one layer of
13589 DW_AT_abstract_origin, follow them all; there shouldn't be,
13590 but GCC versions at least through 4.4 generate this (GCC PR
13592 child_origin_die = child_die;
13593 child_origin_cu = cu;
13596 attr = dwarf2_attr (child_origin_die, DW_AT_abstract_origin,
13600 child_origin_die = follow_die_ref (child_origin_die, attr,
13604 /* According to DWARF3 3.3.8.2 #3 new entries without their abstract
13605 counterpart may exist. */
13606 if (child_origin_die != child_die)
13608 if (child_die->tag != child_origin_die->tag
13609 && !(child_die->tag == DW_TAG_inlined_subroutine
13610 && child_origin_die->tag == DW_TAG_subprogram))
13611 complaint (&symfile_complaints,
13612 _("Child DIE 0x%x and its abstract origin 0x%x have "
13614 to_underlying (child_die->sect_off),
13615 to_underlying (child_origin_die->sect_off));
13616 if (child_origin_die->parent != origin_die)
13617 complaint (&symfile_complaints,
13618 _("Child DIE 0x%x and its abstract origin 0x%x have "
13619 "different parents"),
13620 to_underlying (child_die->sect_off),
13621 to_underlying (child_origin_die->sect_off));
13623 offsets.push_back (child_origin_die->sect_off);
13626 std::sort (offsets.begin (), offsets.end ());
13627 sect_offset *offsets_end = offsets.data () + offsets.size ();
13628 for (offsetp = offsets.data () + 1; offsetp < offsets_end; offsetp++)
13629 if (offsetp[-1] == *offsetp)
13630 complaint (&symfile_complaints,
13631 _("Multiple children of DIE 0x%x refer "
13632 "to DIE 0x%x as their abstract origin"),
13633 to_underlying (die->sect_off), to_underlying (*offsetp));
13635 offsetp = offsets.data ();
13636 origin_child_die = origin_die->child;
13637 while (origin_child_die && origin_child_die->tag)
13639 /* Is ORIGIN_CHILD_DIE referenced by any of the DIE children? */
13640 while (offsetp < offsets_end
13641 && *offsetp < origin_child_die->sect_off)
13643 if (offsetp >= offsets_end
13644 || *offsetp > origin_child_die->sect_off)
13646 /* Found that ORIGIN_CHILD_DIE is really not referenced.
13647 Check whether we're already processing ORIGIN_CHILD_DIE.
13648 This can happen with mutually referenced abstract_origins.
13650 if (!origin_child_die->in_process)
13651 process_die (origin_child_die, origin_cu);
13653 origin_child_die = sibling_die (origin_child_die);
13655 origin_cu->list_in_scope = origin_previous_list_in_scope;
13659 read_func_scope (struct die_info *die, struct dwarf2_cu *cu)
13661 struct objfile *objfile = cu->objfile;
13662 struct gdbarch *gdbarch = get_objfile_arch (objfile);
13663 struct context_stack *newobj;
13666 struct die_info *child_die;
13667 struct attribute *attr, *call_line, *call_file;
13669 CORE_ADDR baseaddr;
13670 struct block *block;
13671 int inlined_func = (die->tag == DW_TAG_inlined_subroutine);
13672 std::vector<struct symbol *> template_args;
13673 struct template_symbol *templ_func = NULL;
13677 /* If we do not have call site information, we can't show the
13678 caller of this inlined function. That's too confusing, so
13679 only use the scope for local variables. */
13680 call_line = dwarf2_attr (die, DW_AT_call_line, cu);
13681 call_file = dwarf2_attr (die, DW_AT_call_file, cu);
13682 if (call_line == NULL || call_file == NULL)
13684 read_lexical_block_scope (die, cu);
13689 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
13691 name = dwarf2_name (die, cu);
13693 /* Ignore functions with missing or empty names. These are actually
13694 illegal according to the DWARF standard. */
13697 complaint (&symfile_complaints,
13698 _("missing name for subprogram DIE at %d"),
13699 to_underlying (die->sect_off));
13703 /* Ignore functions with missing or invalid low and high pc attributes. */
13704 if (dwarf2_get_pc_bounds (die, &lowpc, &highpc, cu, NULL)
13705 <= PC_BOUNDS_INVALID)
13707 attr = dwarf2_attr (die, DW_AT_external, cu);
13708 if (!attr || !DW_UNSND (attr))
13709 complaint (&symfile_complaints,
13710 _("cannot get low and high bounds "
13711 "for subprogram DIE at %d"),
13712 to_underlying (die->sect_off));
13716 lowpc = gdbarch_adjust_dwarf2_addr (gdbarch, lowpc + baseaddr);
13717 highpc = gdbarch_adjust_dwarf2_addr (gdbarch, highpc + baseaddr);
13719 /* If we have any template arguments, then we must allocate a
13720 different sort of symbol. */
13721 for (child_die = die->child; child_die; child_die = sibling_die (child_die))
13723 if (child_die->tag == DW_TAG_template_type_param
13724 || child_die->tag == DW_TAG_template_value_param)
13726 templ_func = allocate_template_symbol (objfile);
13727 templ_func->subclass = SYMBOL_TEMPLATE;
13732 newobj = push_context (0, lowpc);
13733 newobj->name = new_symbol_full (die, read_type_die (die, cu), cu,
13734 (struct symbol *) templ_func);
13736 /* If there is a location expression for DW_AT_frame_base, record
13738 attr = dwarf2_attr (die, DW_AT_frame_base, cu);
13740 dwarf2_symbol_mark_computed (attr, newobj->name, cu, 1);
13742 /* If there is a location for the static link, record it. */
13743 newobj->static_link = NULL;
13744 attr = dwarf2_attr (die, DW_AT_static_link, cu);
13747 newobj->static_link
13748 = XOBNEW (&objfile->objfile_obstack, struct dynamic_prop);
13749 attr_to_dynamic_prop (attr, die, cu, newobj->static_link);
13752 cu->list_in_scope = &local_symbols;
13754 if (die->child != NULL)
13756 child_die = die->child;
13757 while (child_die && child_die->tag)
13759 if (child_die->tag == DW_TAG_template_type_param
13760 || child_die->tag == DW_TAG_template_value_param)
13762 struct symbol *arg = new_symbol (child_die, NULL, cu);
13765 template_args.push_back (arg);
13768 process_die (child_die, cu);
13769 child_die = sibling_die (child_die);
13773 inherit_abstract_dies (die, cu);
13775 /* If we have a DW_AT_specification, we might need to import using
13776 directives from the context of the specification DIE. See the
13777 comment in determine_prefix. */
13778 if (cu->language == language_cplus
13779 && dwarf2_attr (die, DW_AT_specification, cu))
13781 struct dwarf2_cu *spec_cu = cu;
13782 struct die_info *spec_die = die_specification (die, &spec_cu);
13786 child_die = spec_die->child;
13787 while (child_die && child_die->tag)
13789 if (child_die->tag == DW_TAG_imported_module)
13790 process_die (child_die, spec_cu);
13791 child_die = sibling_die (child_die);
13794 /* In some cases, GCC generates specification DIEs that
13795 themselves contain DW_AT_specification attributes. */
13796 spec_die = die_specification (spec_die, &spec_cu);
13800 newobj = pop_context ();
13801 /* Make a block for the local symbols within. */
13802 block = finish_block (newobj->name, &local_symbols, newobj->old_blocks,
13803 newobj->static_link, lowpc, highpc);
13805 /* For C++, set the block's scope. */
13806 if ((cu->language == language_cplus
13807 || cu->language == language_fortran
13808 || cu->language == language_d
13809 || cu->language == language_rust)
13810 && cu->processing_has_namespace_info)
13811 block_set_scope (block, determine_prefix (die, cu),
13812 &objfile->objfile_obstack);
13814 /* If we have address ranges, record them. */
13815 dwarf2_record_block_ranges (die, block, baseaddr, cu);
13817 gdbarch_make_symbol_special (gdbarch, newobj->name, objfile);
13819 /* Attach template arguments to function. */
13820 if (!template_args.empty ())
13822 gdb_assert (templ_func != NULL);
13824 templ_func->n_template_arguments = template_args.size ();
13825 templ_func->template_arguments
13826 = XOBNEWVEC (&objfile->objfile_obstack, struct symbol *,
13827 templ_func->n_template_arguments);
13828 memcpy (templ_func->template_arguments,
13829 template_args.data (),
13830 (templ_func->n_template_arguments * sizeof (struct symbol *)));
13833 /* In C++, we can have functions nested inside functions (e.g., when
13834 a function declares a class that has methods). This means that
13835 when we finish processing a function scope, we may need to go
13836 back to building a containing block's symbol lists. */
13837 local_symbols = newobj->locals;
13838 local_using_directives = newobj->local_using_directives;
13840 /* If we've finished processing a top-level function, subsequent
13841 symbols go in the file symbol list. */
13842 if (outermost_context_p ())
13843 cu->list_in_scope = &file_symbols;
13846 /* Process all the DIES contained within a lexical block scope. Start
13847 a new scope, process the dies, and then close the scope. */
13850 read_lexical_block_scope (struct die_info *die, struct dwarf2_cu *cu)
13852 struct objfile *objfile = cu->objfile;
13853 struct gdbarch *gdbarch = get_objfile_arch (objfile);
13854 struct context_stack *newobj;
13855 CORE_ADDR lowpc, highpc;
13856 struct die_info *child_die;
13857 CORE_ADDR baseaddr;
13859 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
13861 /* Ignore blocks with missing or invalid low and high pc attributes. */
13862 /* ??? Perhaps consider discontiguous blocks defined by DW_AT_ranges
13863 as multiple lexical blocks? Handling children in a sane way would
13864 be nasty. Might be easier to properly extend generic blocks to
13865 describe ranges. */
13866 switch (dwarf2_get_pc_bounds (die, &lowpc, &highpc, cu, NULL))
13868 case PC_BOUNDS_NOT_PRESENT:
13869 /* DW_TAG_lexical_block has no attributes, process its children as if
13870 there was no wrapping by that DW_TAG_lexical_block.
13871 GCC does no longer produces such DWARF since GCC r224161. */
13872 for (child_die = die->child;
13873 child_die != NULL && child_die->tag;
13874 child_die = sibling_die (child_die))
13875 process_die (child_die, cu);
13877 case PC_BOUNDS_INVALID:
13880 lowpc = gdbarch_adjust_dwarf2_addr (gdbarch, lowpc + baseaddr);
13881 highpc = gdbarch_adjust_dwarf2_addr (gdbarch, highpc + baseaddr);
13883 push_context (0, lowpc);
13884 if (die->child != NULL)
13886 child_die = die->child;
13887 while (child_die && child_die->tag)
13889 process_die (child_die, cu);
13890 child_die = sibling_die (child_die);
13893 inherit_abstract_dies (die, cu);
13894 newobj = pop_context ();
13896 if (local_symbols != NULL || local_using_directives != NULL)
13898 struct block *block
13899 = finish_block (0, &local_symbols, newobj->old_blocks, NULL,
13900 newobj->start_addr, highpc);
13902 /* Note that recording ranges after traversing children, as we
13903 do here, means that recording a parent's ranges entails
13904 walking across all its children's ranges as they appear in
13905 the address map, which is quadratic behavior.
13907 It would be nicer to record the parent's ranges before
13908 traversing its children, simply overriding whatever you find
13909 there. But since we don't even decide whether to create a
13910 block until after we've traversed its children, that's hard
13912 dwarf2_record_block_ranges (die, block, baseaddr, cu);
13914 local_symbols = newobj->locals;
13915 local_using_directives = newobj->local_using_directives;
13918 /* Read in DW_TAG_call_site and insert it to CU->call_site_htab. */
13921 read_call_site_scope (struct die_info *die, struct dwarf2_cu *cu)
13923 struct objfile *objfile = cu->objfile;
13924 struct gdbarch *gdbarch = get_objfile_arch (objfile);
13925 CORE_ADDR pc, baseaddr;
13926 struct attribute *attr;
13927 struct call_site *call_site, call_site_local;
13930 struct die_info *child_die;
13932 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
13934 attr = dwarf2_attr (die, DW_AT_call_return_pc, cu);
13937 /* This was a pre-DWARF-5 GNU extension alias
13938 for DW_AT_call_return_pc. */
13939 attr = dwarf2_attr (die, DW_AT_low_pc, cu);
13943 complaint (&symfile_complaints,
13944 _("missing DW_AT_call_return_pc for DW_TAG_call_site "
13945 "DIE 0x%x [in module %s]"),
13946 to_underlying (die->sect_off), objfile_name (objfile));
13949 pc = attr_value_as_address (attr) + baseaddr;
13950 pc = gdbarch_adjust_dwarf2_addr (gdbarch, pc);
13952 if (cu->call_site_htab == NULL)
13953 cu->call_site_htab = htab_create_alloc_ex (16, core_addr_hash, core_addr_eq,
13954 NULL, &objfile->objfile_obstack,
13955 hashtab_obstack_allocate, NULL);
13956 call_site_local.pc = pc;
13957 slot = htab_find_slot (cu->call_site_htab, &call_site_local, INSERT);
13960 complaint (&symfile_complaints,
13961 _("Duplicate PC %s for DW_TAG_call_site "
13962 "DIE 0x%x [in module %s]"),
13963 paddress (gdbarch, pc), to_underlying (die->sect_off),
13964 objfile_name (objfile));
13968 /* Count parameters at the caller. */
13971 for (child_die = die->child; child_die && child_die->tag;
13972 child_die = sibling_die (child_die))
13974 if (child_die->tag != DW_TAG_call_site_parameter
13975 && child_die->tag != DW_TAG_GNU_call_site_parameter)
13977 complaint (&symfile_complaints,
13978 _("Tag %d is not DW_TAG_call_site_parameter in "
13979 "DW_TAG_call_site child DIE 0x%x [in module %s]"),
13980 child_die->tag, to_underlying (child_die->sect_off),
13981 objfile_name (objfile));
13989 = ((struct call_site *)
13990 obstack_alloc (&objfile->objfile_obstack,
13991 sizeof (*call_site)
13992 + (sizeof (*call_site->parameter) * (nparams - 1))));
13994 memset (call_site, 0, sizeof (*call_site) - sizeof (*call_site->parameter));
13995 call_site->pc = pc;
13997 if (dwarf2_flag_true_p (die, DW_AT_call_tail_call, cu)
13998 || dwarf2_flag_true_p (die, DW_AT_GNU_tail_call, cu))
14000 struct die_info *func_die;
14002 /* Skip also over DW_TAG_inlined_subroutine. */
14003 for (func_die = die->parent;
14004 func_die && func_die->tag != DW_TAG_subprogram
14005 && func_die->tag != DW_TAG_subroutine_type;
14006 func_die = func_die->parent);
14008 /* DW_AT_call_all_calls is a superset
14009 of DW_AT_call_all_tail_calls. */
14011 && !dwarf2_flag_true_p (func_die, DW_AT_call_all_calls, cu)
14012 && !dwarf2_flag_true_p (func_die, DW_AT_GNU_all_call_sites, cu)
14013 && !dwarf2_flag_true_p (func_die, DW_AT_call_all_tail_calls, cu)
14014 && !dwarf2_flag_true_p (func_die, DW_AT_GNU_all_tail_call_sites, cu))
14016 /* TYPE_TAIL_CALL_LIST is not interesting in functions where it is
14017 not complete. But keep CALL_SITE for look ups via call_site_htab,
14018 both the initial caller containing the real return address PC and
14019 the final callee containing the current PC of a chain of tail
14020 calls do not need to have the tail call list complete. But any
14021 function candidate for a virtual tail call frame searched via
14022 TYPE_TAIL_CALL_LIST must have the tail call list complete to be
14023 determined unambiguously. */
14027 struct type *func_type = NULL;
14030 func_type = get_die_type (func_die, cu);
14031 if (func_type != NULL)
14033 gdb_assert (TYPE_CODE (func_type) == TYPE_CODE_FUNC);
14035 /* Enlist this call site to the function. */
14036 call_site->tail_call_next = TYPE_TAIL_CALL_LIST (func_type);
14037 TYPE_TAIL_CALL_LIST (func_type) = call_site;
14040 complaint (&symfile_complaints,
14041 _("Cannot find function owning DW_TAG_call_site "
14042 "DIE 0x%x [in module %s]"),
14043 to_underlying (die->sect_off), objfile_name (objfile));
14047 attr = dwarf2_attr (die, DW_AT_call_target, cu);
14049 attr = dwarf2_attr (die, DW_AT_GNU_call_site_target, cu);
14051 attr = dwarf2_attr (die, DW_AT_call_origin, cu);
14054 /* This was a pre-DWARF-5 GNU extension alias for DW_AT_call_origin. */
14055 attr = dwarf2_attr (die, DW_AT_abstract_origin, cu);
14057 SET_FIELD_DWARF_BLOCK (call_site->target, NULL);
14058 if (!attr || (attr_form_is_block (attr) && DW_BLOCK (attr)->size == 0))
14059 /* Keep NULL DWARF_BLOCK. */;
14060 else if (attr_form_is_block (attr))
14062 struct dwarf2_locexpr_baton *dlbaton;
14064 dlbaton = XOBNEW (&objfile->objfile_obstack, struct dwarf2_locexpr_baton);
14065 dlbaton->data = DW_BLOCK (attr)->data;
14066 dlbaton->size = DW_BLOCK (attr)->size;
14067 dlbaton->per_cu = cu->per_cu;
14069 SET_FIELD_DWARF_BLOCK (call_site->target, dlbaton);
14071 else if (attr_form_is_ref (attr))
14073 struct dwarf2_cu *target_cu = cu;
14074 struct die_info *target_die;
14076 target_die = follow_die_ref (die, attr, &target_cu);
14077 gdb_assert (target_cu->objfile == objfile);
14078 if (die_is_declaration (target_die, target_cu))
14080 const char *target_physname;
14082 /* Prefer the mangled name; otherwise compute the demangled one. */
14083 target_physname = dw2_linkage_name (target_die, target_cu);
14084 if (target_physname == NULL)
14085 target_physname = dwarf2_physname (NULL, target_die, target_cu);
14086 if (target_physname == NULL)
14087 complaint (&symfile_complaints,
14088 _("DW_AT_call_target target DIE has invalid "
14089 "physname, for referencing DIE 0x%x [in module %s]"),
14090 to_underlying (die->sect_off), objfile_name (objfile));
14092 SET_FIELD_PHYSNAME (call_site->target, target_physname);
14098 /* DW_AT_entry_pc should be preferred. */
14099 if (dwarf2_get_pc_bounds (target_die, &lowpc, NULL, target_cu, NULL)
14100 <= PC_BOUNDS_INVALID)
14101 complaint (&symfile_complaints,
14102 _("DW_AT_call_target target DIE has invalid "
14103 "low pc, for referencing DIE 0x%x [in module %s]"),
14104 to_underlying (die->sect_off), objfile_name (objfile));
14107 lowpc = gdbarch_adjust_dwarf2_addr (gdbarch, lowpc + baseaddr);
14108 SET_FIELD_PHYSADDR (call_site->target, lowpc);
14113 complaint (&symfile_complaints,
14114 _("DW_TAG_call_site DW_AT_call_target is neither "
14115 "block nor reference, for DIE 0x%x [in module %s]"),
14116 to_underlying (die->sect_off), objfile_name (objfile));
14118 call_site->per_cu = cu->per_cu;
14120 for (child_die = die->child;
14121 child_die && child_die->tag;
14122 child_die = sibling_die (child_die))
14124 struct call_site_parameter *parameter;
14125 struct attribute *loc, *origin;
14127 if (child_die->tag != DW_TAG_call_site_parameter
14128 && child_die->tag != DW_TAG_GNU_call_site_parameter)
14130 /* Already printed the complaint above. */
14134 gdb_assert (call_site->parameter_count < nparams);
14135 parameter = &call_site->parameter[call_site->parameter_count];
14137 /* DW_AT_location specifies the register number or DW_AT_abstract_origin
14138 specifies DW_TAG_formal_parameter. Value of the data assumed for the
14139 register is contained in DW_AT_call_value. */
14141 loc = dwarf2_attr (child_die, DW_AT_location, cu);
14142 origin = dwarf2_attr (child_die, DW_AT_call_parameter, cu);
14143 if (origin == NULL)
14145 /* This was a pre-DWARF-5 GNU extension alias
14146 for DW_AT_call_parameter. */
14147 origin = dwarf2_attr (child_die, DW_AT_abstract_origin, cu);
14149 if (loc == NULL && origin != NULL && attr_form_is_ref (origin))
14151 parameter->kind = CALL_SITE_PARAMETER_PARAM_OFFSET;
14153 sect_offset sect_off
14154 = (sect_offset) dwarf2_get_ref_die_offset (origin);
14155 if (!offset_in_cu_p (&cu->header, sect_off))
14157 /* As DW_OP_GNU_parameter_ref uses CU-relative offset this
14158 binding can be done only inside one CU. Such referenced DIE
14159 therefore cannot be even moved to DW_TAG_partial_unit. */
14160 complaint (&symfile_complaints,
14161 _("DW_AT_call_parameter offset is not in CU for "
14162 "DW_TAG_call_site child DIE 0x%x [in module %s]"),
14163 to_underlying (child_die->sect_off),
14164 objfile_name (objfile));
14167 parameter->u.param_cu_off
14168 = (cu_offset) (sect_off - cu->header.sect_off);
14170 else if (loc == NULL || origin != NULL || !attr_form_is_block (loc))
14172 complaint (&symfile_complaints,
14173 _("No DW_FORM_block* DW_AT_location for "
14174 "DW_TAG_call_site child DIE 0x%x [in module %s]"),
14175 to_underlying (child_die->sect_off), objfile_name (objfile));
14180 parameter->u.dwarf_reg = dwarf_block_to_dwarf_reg
14181 (DW_BLOCK (loc)->data, &DW_BLOCK (loc)->data[DW_BLOCK (loc)->size]);
14182 if (parameter->u.dwarf_reg != -1)
14183 parameter->kind = CALL_SITE_PARAMETER_DWARF_REG;
14184 else if (dwarf_block_to_sp_offset (gdbarch, DW_BLOCK (loc)->data,
14185 &DW_BLOCK (loc)->data[DW_BLOCK (loc)->size],
14186 ¶meter->u.fb_offset))
14187 parameter->kind = CALL_SITE_PARAMETER_FB_OFFSET;
14190 complaint (&symfile_complaints,
14191 _("Only single DW_OP_reg or DW_OP_fbreg is supported "
14192 "for DW_FORM_block* DW_AT_location is supported for "
14193 "DW_TAG_call_site child DIE 0x%x "
14195 to_underlying (child_die->sect_off),
14196 objfile_name (objfile));
14201 attr = dwarf2_attr (child_die, DW_AT_call_value, cu);
14203 attr = dwarf2_attr (child_die, DW_AT_GNU_call_site_value, cu);
14204 if (!attr_form_is_block (attr))
14206 complaint (&symfile_complaints,
14207 _("No DW_FORM_block* DW_AT_call_value for "
14208 "DW_TAG_call_site child DIE 0x%x [in module %s]"),
14209 to_underlying (child_die->sect_off),
14210 objfile_name (objfile));
14213 parameter->value = DW_BLOCK (attr)->data;
14214 parameter->value_size = DW_BLOCK (attr)->size;
14216 /* Parameters are not pre-cleared by memset above. */
14217 parameter->data_value = NULL;
14218 parameter->data_value_size = 0;
14219 call_site->parameter_count++;
14221 attr = dwarf2_attr (child_die, DW_AT_call_data_value, cu);
14223 attr = dwarf2_attr (child_die, DW_AT_GNU_call_site_data_value, cu);
14226 if (!attr_form_is_block (attr))
14227 complaint (&symfile_complaints,
14228 _("No DW_FORM_block* DW_AT_call_data_value for "
14229 "DW_TAG_call_site child DIE 0x%x [in module %s]"),
14230 to_underlying (child_die->sect_off),
14231 objfile_name (objfile));
14234 parameter->data_value = DW_BLOCK (attr)->data;
14235 parameter->data_value_size = DW_BLOCK (attr)->size;
14241 /* Helper function for read_variable. If DIE represents a virtual
14242 table, then return the type of the concrete object that is
14243 associated with the virtual table. Otherwise, return NULL. */
14245 static struct type *
14246 rust_containing_type (struct die_info *die, struct dwarf2_cu *cu)
14248 struct attribute *attr = dwarf2_attr (die, DW_AT_type, cu);
14252 /* Find the type DIE. */
14253 struct die_info *type_die = NULL;
14254 struct dwarf2_cu *type_cu = cu;
14256 if (attr_form_is_ref (attr))
14257 type_die = follow_die_ref (die, attr, &type_cu);
14258 if (type_die == NULL)
14261 if (dwarf2_attr (type_die, DW_AT_containing_type, type_cu) == NULL)
14263 return die_containing_type (type_die, type_cu);
14266 /* Read a variable (DW_TAG_variable) DIE and create a new symbol. */
14269 read_variable (struct die_info *die, struct dwarf2_cu *cu)
14271 struct rust_vtable_symbol *storage = NULL;
14273 if (cu->language == language_rust)
14275 struct type *containing_type = rust_containing_type (die, cu);
14277 if (containing_type != NULL)
14279 struct objfile *objfile = cu->objfile;
14281 storage = OBSTACK_ZALLOC (&objfile->objfile_obstack,
14282 struct rust_vtable_symbol);
14283 initialize_objfile_symbol (storage);
14284 storage->concrete_type = containing_type;
14285 storage->subclass = SYMBOL_RUST_VTABLE;
14289 new_symbol_full (die, NULL, cu, storage);
14292 /* Call CALLBACK from DW_AT_ranges attribute value OFFSET
14293 reading .debug_rnglists.
14294 Callback's type should be:
14295 void (CORE_ADDR range_beginning, CORE_ADDR range_end)
14296 Return true if the attributes are present and valid, otherwise,
14299 template <typename Callback>
14301 dwarf2_rnglists_process (unsigned offset, struct dwarf2_cu *cu,
14302 Callback &&callback)
14304 struct objfile *objfile = cu->objfile;
14305 bfd *obfd = objfile->obfd;
14306 /* Base address selection entry. */
14309 const gdb_byte *buffer;
14310 CORE_ADDR baseaddr;
14311 bool overflow = false;
14313 found_base = cu->base_known;
14314 base = cu->base_address;
14316 dwarf2_read_section (objfile, &dwarf2_per_objfile->rnglists);
14317 if (offset >= dwarf2_per_objfile->rnglists.size)
14319 complaint (&symfile_complaints,
14320 _("Offset %d out of bounds for DW_AT_ranges attribute"),
14324 buffer = dwarf2_per_objfile->rnglists.buffer + offset;
14326 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
14330 /* Initialize it due to a false compiler warning. */
14331 CORE_ADDR range_beginning = 0, range_end = 0;
14332 const gdb_byte *buf_end = (dwarf2_per_objfile->rnglists.buffer
14333 + dwarf2_per_objfile->rnglists.size);
14334 unsigned int bytes_read;
14336 if (buffer == buf_end)
14341 const auto rlet = static_cast<enum dwarf_range_list_entry>(*buffer++);
14344 case DW_RLE_end_of_list:
14346 case DW_RLE_base_address:
14347 if (buffer + cu->header.addr_size > buf_end)
14352 base = read_address (obfd, buffer, cu, &bytes_read);
14354 buffer += bytes_read;
14356 case DW_RLE_start_length:
14357 if (buffer + cu->header.addr_size > buf_end)
14362 range_beginning = read_address (obfd, buffer, cu, &bytes_read);
14363 buffer += bytes_read;
14364 range_end = (range_beginning
14365 + read_unsigned_leb128 (obfd, buffer, &bytes_read));
14366 buffer += bytes_read;
14367 if (buffer > buf_end)
14373 case DW_RLE_offset_pair:
14374 range_beginning = read_unsigned_leb128 (obfd, buffer, &bytes_read);
14375 buffer += bytes_read;
14376 if (buffer > buf_end)
14381 range_end = read_unsigned_leb128 (obfd, buffer, &bytes_read);
14382 buffer += bytes_read;
14383 if (buffer > buf_end)
14389 case DW_RLE_start_end:
14390 if (buffer + 2 * cu->header.addr_size > buf_end)
14395 range_beginning = read_address (obfd, buffer, cu, &bytes_read);
14396 buffer += bytes_read;
14397 range_end = read_address (obfd, buffer, cu, &bytes_read);
14398 buffer += bytes_read;
14401 complaint (&symfile_complaints,
14402 _("Invalid .debug_rnglists data (no base address)"));
14405 if (rlet == DW_RLE_end_of_list || overflow)
14407 if (rlet == DW_RLE_base_address)
14412 /* We have no valid base address for the ranges
14414 complaint (&symfile_complaints,
14415 _("Invalid .debug_rnglists data (no base address)"));
14419 if (range_beginning > range_end)
14421 /* Inverted range entries are invalid. */
14422 complaint (&symfile_complaints,
14423 _("Invalid .debug_rnglists data (inverted range)"));
14427 /* Empty range entries have no effect. */
14428 if (range_beginning == range_end)
14431 range_beginning += base;
14434 /* A not-uncommon case of bad debug info.
14435 Don't pollute the addrmap with bad data. */
14436 if (range_beginning + baseaddr == 0
14437 && !dwarf2_per_objfile->has_section_at_zero)
14439 complaint (&symfile_complaints,
14440 _(".debug_rnglists entry has start address of zero"
14441 " [in module %s]"), objfile_name (objfile));
14445 callback (range_beginning, range_end);
14450 complaint (&symfile_complaints,
14451 _("Offset %d is not terminated "
14452 "for DW_AT_ranges attribute"),
14460 /* Call CALLBACK from DW_AT_ranges attribute value OFFSET reading .debug_ranges.
14461 Callback's type should be:
14462 void (CORE_ADDR range_beginning, CORE_ADDR range_end)
14463 Return 1 if the attributes are present and valid, otherwise, return 0. */
14465 template <typename Callback>
14467 dwarf2_ranges_process (unsigned offset, struct dwarf2_cu *cu,
14468 Callback &&callback)
14470 struct objfile *objfile = cu->objfile;
14471 struct comp_unit_head *cu_header = &cu->header;
14472 bfd *obfd = objfile->obfd;
14473 unsigned int addr_size = cu_header->addr_size;
14474 CORE_ADDR mask = ~(~(CORE_ADDR)1 << (addr_size * 8 - 1));
14475 /* Base address selection entry. */
14478 unsigned int dummy;
14479 const gdb_byte *buffer;
14480 CORE_ADDR baseaddr;
14482 if (cu_header->version >= 5)
14483 return dwarf2_rnglists_process (offset, cu, callback);
14485 found_base = cu->base_known;
14486 base = cu->base_address;
14488 dwarf2_read_section (objfile, &dwarf2_per_objfile->ranges);
14489 if (offset >= dwarf2_per_objfile->ranges.size)
14491 complaint (&symfile_complaints,
14492 _("Offset %d out of bounds for DW_AT_ranges attribute"),
14496 buffer = dwarf2_per_objfile->ranges.buffer + offset;
14498 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
14502 CORE_ADDR range_beginning, range_end;
14504 range_beginning = read_address (obfd, buffer, cu, &dummy);
14505 buffer += addr_size;
14506 range_end = read_address (obfd, buffer, cu, &dummy);
14507 buffer += addr_size;
14508 offset += 2 * addr_size;
14510 /* An end of list marker is a pair of zero addresses. */
14511 if (range_beginning == 0 && range_end == 0)
14512 /* Found the end of list entry. */
14515 /* Each base address selection entry is a pair of 2 values.
14516 The first is the largest possible address, the second is
14517 the base address. Check for a base address here. */
14518 if ((range_beginning & mask) == mask)
14520 /* If we found the largest possible address, then we already
14521 have the base address in range_end. */
14529 /* We have no valid base address for the ranges
14531 complaint (&symfile_complaints,
14532 _("Invalid .debug_ranges data (no base address)"));
14536 if (range_beginning > range_end)
14538 /* Inverted range entries are invalid. */
14539 complaint (&symfile_complaints,
14540 _("Invalid .debug_ranges data (inverted range)"));
14544 /* Empty range entries have no effect. */
14545 if (range_beginning == range_end)
14548 range_beginning += base;
14551 /* A not-uncommon case of bad debug info.
14552 Don't pollute the addrmap with bad data. */
14553 if (range_beginning + baseaddr == 0
14554 && !dwarf2_per_objfile->has_section_at_zero)
14556 complaint (&symfile_complaints,
14557 _(".debug_ranges entry has start address of zero"
14558 " [in module %s]"), objfile_name (objfile));
14562 callback (range_beginning, range_end);
14568 /* Get low and high pc attributes from DW_AT_ranges attribute value OFFSET.
14569 Return 1 if the attributes are present and valid, otherwise, return 0.
14570 If RANGES_PST is not NULL we should setup `objfile->psymtabs_addrmap'. */
14573 dwarf2_ranges_read (unsigned offset, CORE_ADDR *low_return,
14574 CORE_ADDR *high_return, struct dwarf2_cu *cu,
14575 struct partial_symtab *ranges_pst)
14577 struct objfile *objfile = cu->objfile;
14578 struct gdbarch *gdbarch = get_objfile_arch (objfile);
14579 const CORE_ADDR baseaddr = ANOFFSET (objfile->section_offsets,
14580 SECT_OFF_TEXT (objfile));
14583 CORE_ADDR high = 0;
14586 retval = dwarf2_ranges_process (offset, cu,
14587 [&] (CORE_ADDR range_beginning, CORE_ADDR range_end)
14589 if (ranges_pst != NULL)
14594 lowpc = gdbarch_adjust_dwarf2_addr (gdbarch,
14595 range_beginning + baseaddr);
14596 highpc = gdbarch_adjust_dwarf2_addr (gdbarch,
14597 range_end + baseaddr);
14598 addrmap_set_empty (objfile->psymtabs_addrmap, lowpc, highpc - 1,
14602 /* FIXME: This is recording everything as a low-high
14603 segment of consecutive addresses. We should have a
14604 data structure for discontiguous block ranges
14608 low = range_beginning;
14614 if (range_beginning < low)
14615 low = range_beginning;
14616 if (range_end > high)
14624 /* If the first entry is an end-of-list marker, the range
14625 describes an empty scope, i.e. no instructions. */
14631 *high_return = high;
14635 /* Get low and high pc attributes from a die. See enum pc_bounds_kind
14636 definition for the return value. *LOWPC and *HIGHPC are set iff
14637 neither PC_BOUNDS_NOT_PRESENT nor PC_BOUNDS_INVALID are returned. */
14639 static enum pc_bounds_kind
14640 dwarf2_get_pc_bounds (struct die_info *die, CORE_ADDR *lowpc,
14641 CORE_ADDR *highpc, struct dwarf2_cu *cu,
14642 struct partial_symtab *pst)
14644 struct attribute *attr;
14645 struct attribute *attr_high;
14647 CORE_ADDR high = 0;
14648 enum pc_bounds_kind ret;
14650 attr_high = dwarf2_attr (die, DW_AT_high_pc, cu);
14653 attr = dwarf2_attr (die, DW_AT_low_pc, cu);
14656 low = attr_value_as_address (attr);
14657 high = attr_value_as_address (attr_high);
14658 if (cu->header.version >= 4 && attr_form_is_constant (attr_high))
14662 /* Found high w/o low attribute. */
14663 return PC_BOUNDS_INVALID;
14665 /* Found consecutive range of addresses. */
14666 ret = PC_BOUNDS_HIGH_LOW;
14670 attr = dwarf2_attr (die, DW_AT_ranges, cu);
14673 /* DW_AT_ranges_base does not apply to DIEs from the DWO skeleton.
14674 We take advantage of the fact that DW_AT_ranges does not appear
14675 in DW_TAG_compile_unit of DWO files. */
14676 int need_ranges_base = die->tag != DW_TAG_compile_unit;
14677 unsigned int ranges_offset = (DW_UNSND (attr)
14678 + (need_ranges_base
14682 /* Value of the DW_AT_ranges attribute is the offset in the
14683 .debug_ranges section. */
14684 if (!dwarf2_ranges_read (ranges_offset, &low, &high, cu, pst))
14685 return PC_BOUNDS_INVALID;
14686 /* Found discontinuous range of addresses. */
14687 ret = PC_BOUNDS_RANGES;
14690 return PC_BOUNDS_NOT_PRESENT;
14693 /* read_partial_die has also the strict LOW < HIGH requirement. */
14695 return PC_BOUNDS_INVALID;
14697 /* When using the GNU linker, .gnu.linkonce. sections are used to
14698 eliminate duplicate copies of functions and vtables and such.
14699 The linker will arbitrarily choose one and discard the others.
14700 The AT_*_pc values for such functions refer to local labels in
14701 these sections. If the section from that file was discarded, the
14702 labels are not in the output, so the relocs get a value of 0.
14703 If this is a discarded function, mark the pc bounds as invalid,
14704 so that GDB will ignore it. */
14705 if (low == 0 && !dwarf2_per_objfile->has_section_at_zero)
14706 return PC_BOUNDS_INVALID;
14714 /* Assuming that DIE represents a subprogram DIE or a lexical block, get
14715 its low and high PC addresses. Do nothing if these addresses could not
14716 be determined. Otherwise, set LOWPC to the low address if it is smaller,
14717 and HIGHPC to the high address if greater than HIGHPC. */
14720 dwarf2_get_subprogram_pc_bounds (struct die_info *die,
14721 CORE_ADDR *lowpc, CORE_ADDR *highpc,
14722 struct dwarf2_cu *cu)
14724 CORE_ADDR low, high;
14725 struct die_info *child = die->child;
14727 if (dwarf2_get_pc_bounds (die, &low, &high, cu, NULL) >= PC_BOUNDS_RANGES)
14729 *lowpc = std::min (*lowpc, low);
14730 *highpc = std::max (*highpc, high);
14733 /* If the language does not allow nested subprograms (either inside
14734 subprograms or lexical blocks), we're done. */
14735 if (cu->language != language_ada)
14738 /* Check all the children of the given DIE. If it contains nested
14739 subprograms, then check their pc bounds. Likewise, we need to
14740 check lexical blocks as well, as they may also contain subprogram
14742 while (child && child->tag)
14744 if (child->tag == DW_TAG_subprogram
14745 || child->tag == DW_TAG_lexical_block)
14746 dwarf2_get_subprogram_pc_bounds (child, lowpc, highpc, cu);
14747 child = sibling_die (child);
14751 /* Get the low and high pc's represented by the scope DIE, and store
14752 them in *LOWPC and *HIGHPC. If the correct values can't be
14753 determined, set *LOWPC to -1 and *HIGHPC to 0. */
14756 get_scope_pc_bounds (struct die_info *die,
14757 CORE_ADDR *lowpc, CORE_ADDR *highpc,
14758 struct dwarf2_cu *cu)
14760 CORE_ADDR best_low = (CORE_ADDR) -1;
14761 CORE_ADDR best_high = (CORE_ADDR) 0;
14762 CORE_ADDR current_low, current_high;
14764 if (dwarf2_get_pc_bounds (die, ¤t_low, ¤t_high, cu, NULL)
14765 >= PC_BOUNDS_RANGES)
14767 best_low = current_low;
14768 best_high = current_high;
14772 struct die_info *child = die->child;
14774 while (child && child->tag)
14776 switch (child->tag) {
14777 case DW_TAG_subprogram:
14778 dwarf2_get_subprogram_pc_bounds (child, &best_low, &best_high, cu);
14780 case DW_TAG_namespace:
14781 case DW_TAG_module:
14782 /* FIXME: carlton/2004-01-16: Should we do this for
14783 DW_TAG_class_type/DW_TAG_structure_type, too? I think
14784 that current GCC's always emit the DIEs corresponding
14785 to definitions of methods of classes as children of a
14786 DW_TAG_compile_unit or DW_TAG_namespace (as opposed to
14787 the DIEs giving the declarations, which could be
14788 anywhere). But I don't see any reason why the
14789 standards says that they have to be there. */
14790 get_scope_pc_bounds (child, ¤t_low, ¤t_high, cu);
14792 if (current_low != ((CORE_ADDR) -1))
14794 best_low = std::min (best_low, current_low);
14795 best_high = std::max (best_high, current_high);
14803 child = sibling_die (child);
14808 *highpc = best_high;
14811 /* Record the address ranges for BLOCK, offset by BASEADDR, as given
14815 dwarf2_record_block_ranges (struct die_info *die, struct block *block,
14816 CORE_ADDR baseaddr, struct dwarf2_cu *cu)
14818 struct objfile *objfile = cu->objfile;
14819 struct gdbarch *gdbarch = get_objfile_arch (objfile);
14820 struct attribute *attr;
14821 struct attribute *attr_high;
14823 attr_high = dwarf2_attr (die, DW_AT_high_pc, cu);
14826 attr = dwarf2_attr (die, DW_AT_low_pc, cu);
14829 CORE_ADDR low = attr_value_as_address (attr);
14830 CORE_ADDR high = attr_value_as_address (attr_high);
14832 if (cu->header.version >= 4 && attr_form_is_constant (attr_high))
14835 low = gdbarch_adjust_dwarf2_addr (gdbarch, low + baseaddr);
14836 high = gdbarch_adjust_dwarf2_addr (gdbarch, high + baseaddr);
14837 record_block_range (block, low, high - 1);
14841 attr = dwarf2_attr (die, DW_AT_ranges, cu);
14844 /* DW_AT_ranges_base does not apply to DIEs from the DWO skeleton.
14845 We take advantage of the fact that DW_AT_ranges does not appear
14846 in DW_TAG_compile_unit of DWO files. */
14847 int need_ranges_base = die->tag != DW_TAG_compile_unit;
14849 /* The value of the DW_AT_ranges attribute is the offset of the
14850 address range list in the .debug_ranges section. */
14851 unsigned long offset = (DW_UNSND (attr)
14852 + (need_ranges_base ? cu->ranges_base : 0));
14853 const gdb_byte *buffer;
14855 /* For some target architectures, but not others, the
14856 read_address function sign-extends the addresses it returns.
14857 To recognize base address selection entries, we need a
14859 unsigned int addr_size = cu->header.addr_size;
14860 CORE_ADDR base_select_mask = ~(~(CORE_ADDR)1 << (addr_size * 8 - 1));
14862 /* The base address, to which the next pair is relative. Note
14863 that this 'base' is a DWARF concept: most entries in a range
14864 list are relative, to reduce the number of relocs against the
14865 debugging information. This is separate from this function's
14866 'baseaddr' argument, which GDB uses to relocate debugging
14867 information from a shared library based on the address at
14868 which the library was loaded. */
14869 CORE_ADDR base = cu->base_address;
14870 int base_known = cu->base_known;
14872 dwarf2_ranges_process (offset, cu,
14873 [&] (CORE_ADDR start, CORE_ADDR end)
14877 start = gdbarch_adjust_dwarf2_addr (gdbarch, start);
14878 end = gdbarch_adjust_dwarf2_addr (gdbarch, end);
14879 record_block_range (block, start, end - 1);
14884 /* Check whether the producer field indicates either of GCC < 4.6, or the
14885 Intel C/C++ compiler, and cache the result in CU. */
14888 check_producer (struct dwarf2_cu *cu)
14892 if (cu->producer == NULL)
14894 /* For unknown compilers expect their behavior is DWARF version
14897 GCC started to support .debug_types sections by -gdwarf-4 since
14898 gcc-4.5.x. As the .debug_types sections are missing DW_AT_producer
14899 for their space efficiency GDB cannot workaround gcc-4.5.x -gdwarf-4
14900 combination. gcc-4.5.x -gdwarf-4 binaries have DW_AT_accessibility
14901 interpreted incorrectly by GDB now - GCC PR debug/48229. */
14903 else if (producer_is_gcc (cu->producer, &major, &minor))
14905 cu->producer_is_gxx_lt_4_6 = major < 4 || (major == 4 && minor < 6);
14906 cu->producer_is_gcc_lt_4_3 = major < 4 || (major == 4 && minor < 3);
14908 else if (producer_is_icc (cu->producer, &major, &minor))
14909 cu->producer_is_icc_lt_14 = major < 14;
14912 /* For other non-GCC compilers, expect their behavior is DWARF version
14916 cu->checked_producer = 1;
14919 /* Check for GCC PR debug/45124 fix which is not present in any G++ version up
14920 to 4.5.any while it is present already in G++ 4.6.0 - the PR has been fixed
14921 during 4.6.0 experimental. */
14924 producer_is_gxx_lt_4_6 (struct dwarf2_cu *cu)
14926 if (!cu->checked_producer)
14927 check_producer (cu);
14929 return cu->producer_is_gxx_lt_4_6;
14932 /* Return the default accessibility type if it is not overriden by
14933 DW_AT_accessibility. */
14935 static enum dwarf_access_attribute
14936 dwarf2_default_access_attribute (struct die_info *die, struct dwarf2_cu *cu)
14938 if (cu->header.version < 3 || producer_is_gxx_lt_4_6 (cu))
14940 /* The default DWARF 2 accessibility for members is public, the default
14941 accessibility for inheritance is private. */
14943 if (die->tag != DW_TAG_inheritance)
14944 return DW_ACCESS_public;
14946 return DW_ACCESS_private;
14950 /* DWARF 3+ defines the default accessibility a different way. The same
14951 rules apply now for DW_TAG_inheritance as for the members and it only
14952 depends on the container kind. */
14954 if (die->parent->tag == DW_TAG_class_type)
14955 return DW_ACCESS_private;
14957 return DW_ACCESS_public;
14961 /* Look for DW_AT_data_member_location. Set *OFFSET to the byte
14962 offset. If the attribute was not found return 0, otherwise return
14963 1. If it was found but could not properly be handled, set *OFFSET
14967 handle_data_member_location (struct die_info *die, struct dwarf2_cu *cu,
14970 struct attribute *attr;
14972 attr = dwarf2_attr (die, DW_AT_data_member_location, cu);
14977 /* Note that we do not check for a section offset first here.
14978 This is because DW_AT_data_member_location is new in DWARF 4,
14979 so if we see it, we can assume that a constant form is really
14980 a constant and not a section offset. */
14981 if (attr_form_is_constant (attr))
14982 *offset = dwarf2_get_attr_constant_value (attr, 0);
14983 else if (attr_form_is_section_offset (attr))
14984 dwarf2_complex_location_expr_complaint ();
14985 else if (attr_form_is_block (attr))
14986 *offset = decode_locdesc (DW_BLOCK (attr), cu);
14988 dwarf2_complex_location_expr_complaint ();
14996 /* Add an aggregate field to the field list. */
14999 dwarf2_add_field (struct field_info *fip, struct die_info *die,
15000 struct dwarf2_cu *cu)
15002 struct objfile *objfile = cu->objfile;
15003 struct gdbarch *gdbarch = get_objfile_arch (objfile);
15004 struct nextfield *new_field;
15005 struct attribute *attr;
15007 const char *fieldname = "";
15009 /* Allocate a new field list entry and link it in. */
15010 new_field = XNEW (struct nextfield);
15011 make_cleanup (xfree, new_field);
15012 memset (new_field, 0, sizeof (struct nextfield));
15014 if (die->tag == DW_TAG_inheritance)
15016 new_field->next = fip->baseclasses;
15017 fip->baseclasses = new_field;
15021 new_field->next = fip->fields;
15022 fip->fields = new_field;
15026 attr = dwarf2_attr (die, DW_AT_accessibility, cu);
15028 new_field->accessibility = DW_UNSND (attr);
15030 new_field->accessibility = dwarf2_default_access_attribute (die, cu);
15031 if (new_field->accessibility != DW_ACCESS_public)
15032 fip->non_public_fields = 1;
15034 attr = dwarf2_attr (die, DW_AT_virtuality, cu);
15036 new_field->virtuality = DW_UNSND (attr);
15038 new_field->virtuality = DW_VIRTUALITY_none;
15040 fp = &new_field->field;
15042 if (die->tag == DW_TAG_member && ! die_is_declaration (die, cu))
15046 /* Data member other than a C++ static data member. */
15048 /* Get type of field. */
15049 fp->type = die_type (die, cu);
15051 SET_FIELD_BITPOS (*fp, 0);
15053 /* Get bit size of field (zero if none). */
15054 attr = dwarf2_attr (die, DW_AT_bit_size, cu);
15057 FIELD_BITSIZE (*fp) = DW_UNSND (attr);
15061 FIELD_BITSIZE (*fp) = 0;
15064 /* Get bit offset of field. */
15065 if (handle_data_member_location (die, cu, &offset))
15066 SET_FIELD_BITPOS (*fp, offset * bits_per_byte);
15067 attr = dwarf2_attr (die, DW_AT_bit_offset, cu);
15070 if (gdbarch_bits_big_endian (gdbarch))
15072 /* For big endian bits, the DW_AT_bit_offset gives the
15073 additional bit offset from the MSB of the containing
15074 anonymous object to the MSB of the field. We don't
15075 have to do anything special since we don't need to
15076 know the size of the anonymous object. */
15077 SET_FIELD_BITPOS (*fp, FIELD_BITPOS (*fp) + DW_UNSND (attr));
15081 /* For little endian bits, compute the bit offset to the
15082 MSB of the anonymous object, subtract off the number of
15083 bits from the MSB of the field to the MSB of the
15084 object, and then subtract off the number of bits of
15085 the field itself. The result is the bit offset of
15086 the LSB of the field. */
15087 int anonymous_size;
15088 int bit_offset = DW_UNSND (attr);
15090 attr = dwarf2_attr (die, DW_AT_byte_size, cu);
15093 /* The size of the anonymous object containing
15094 the bit field is explicit, so use the
15095 indicated size (in bytes). */
15096 anonymous_size = DW_UNSND (attr);
15100 /* The size of the anonymous object containing
15101 the bit field must be inferred from the type
15102 attribute of the data member containing the
15104 anonymous_size = TYPE_LENGTH (fp->type);
15106 SET_FIELD_BITPOS (*fp,
15107 (FIELD_BITPOS (*fp)
15108 + anonymous_size * bits_per_byte
15109 - bit_offset - FIELD_BITSIZE (*fp)));
15112 attr = dwarf2_attr (die, DW_AT_data_bit_offset, cu);
15114 SET_FIELD_BITPOS (*fp, (FIELD_BITPOS (*fp)
15115 + dwarf2_get_attr_constant_value (attr, 0)));
15117 /* Get name of field. */
15118 fieldname = dwarf2_name (die, cu);
15119 if (fieldname == NULL)
15122 /* The name is already allocated along with this objfile, so we don't
15123 need to duplicate it for the type. */
15124 fp->name = fieldname;
15126 /* Change accessibility for artificial fields (e.g. virtual table
15127 pointer or virtual base class pointer) to private. */
15128 if (dwarf2_attr (die, DW_AT_artificial, cu))
15130 FIELD_ARTIFICIAL (*fp) = 1;
15131 new_field->accessibility = DW_ACCESS_private;
15132 fip->non_public_fields = 1;
15135 else if (die->tag == DW_TAG_member || die->tag == DW_TAG_variable)
15137 /* C++ static member. */
15139 /* NOTE: carlton/2002-11-05: It should be a DW_TAG_member that
15140 is a declaration, but all versions of G++ as of this writing
15141 (so through at least 3.2.1) incorrectly generate
15142 DW_TAG_variable tags. */
15144 const char *physname;
15146 /* Get name of field. */
15147 fieldname = dwarf2_name (die, cu);
15148 if (fieldname == NULL)
15151 attr = dwarf2_attr (die, DW_AT_const_value, cu);
15153 /* Only create a symbol if this is an external value.
15154 new_symbol checks this and puts the value in the global symbol
15155 table, which we want. If it is not external, new_symbol
15156 will try to put the value in cu->list_in_scope which is wrong. */
15157 && dwarf2_flag_true_p (die, DW_AT_external, cu))
15159 /* A static const member, not much different than an enum as far as
15160 we're concerned, except that we can support more types. */
15161 new_symbol (die, NULL, cu);
15164 /* Get physical name. */
15165 physname = dwarf2_physname (fieldname, die, cu);
15167 /* The name is already allocated along with this objfile, so we don't
15168 need to duplicate it for the type. */
15169 SET_FIELD_PHYSNAME (*fp, physname ? physname : "");
15170 FIELD_TYPE (*fp) = die_type (die, cu);
15171 FIELD_NAME (*fp) = fieldname;
15173 else if (die->tag == DW_TAG_inheritance)
15177 /* C++ base class field. */
15178 if (handle_data_member_location (die, cu, &offset))
15179 SET_FIELD_BITPOS (*fp, offset * bits_per_byte);
15180 FIELD_BITSIZE (*fp) = 0;
15181 FIELD_TYPE (*fp) = die_type (die, cu);
15182 FIELD_NAME (*fp) = type_name_no_tag (fp->type);
15183 fip->nbaseclasses++;
15187 /* Can the type given by DIE define another type? */
15190 type_can_define_types (const struct die_info *die)
15194 case DW_TAG_typedef:
15195 case DW_TAG_class_type:
15196 case DW_TAG_structure_type:
15197 case DW_TAG_union_type:
15198 case DW_TAG_enumeration_type:
15206 /* Add a type definition defined in the scope of the FIP's class. */
15209 dwarf2_add_type_defn (struct field_info *fip, struct die_info *die,
15210 struct dwarf2_cu *cu)
15212 struct decl_field_list *new_field;
15213 struct decl_field *fp;
15215 /* Allocate a new field list entry and link it in. */
15216 new_field = XCNEW (struct decl_field_list);
15217 make_cleanup (xfree, new_field);
15219 gdb_assert (type_can_define_types (die));
15221 fp = &new_field->field;
15223 /* Get name of field. NULL is okay here, meaning an anonymous type. */
15224 fp->name = dwarf2_name (die, cu);
15225 fp->type = read_type_die (die, cu);
15227 /* Save accessibility. */
15228 enum dwarf_access_attribute accessibility;
15229 struct attribute *attr = dwarf2_attr (die, DW_AT_accessibility, cu);
15231 accessibility = (enum dwarf_access_attribute) DW_UNSND (attr);
15233 accessibility = dwarf2_default_access_attribute (die, cu);
15234 switch (accessibility)
15236 case DW_ACCESS_public:
15237 /* The assumed value if neither private nor protected. */
15239 case DW_ACCESS_private:
15240 fp->is_private = 1;
15242 case DW_ACCESS_protected:
15243 fp->is_protected = 1;
15246 complaint (&symfile_complaints,
15247 _("Unhandled DW_AT_accessibility value (%x)"), accessibility);
15250 if (die->tag == DW_TAG_typedef)
15252 new_field->next = fip->typedef_field_list;
15253 fip->typedef_field_list = new_field;
15254 fip->typedef_field_list_count++;
15258 new_field->next = fip->nested_types_list;
15259 fip->nested_types_list = new_field;
15260 fip->nested_types_list_count++;
15264 /* Create the vector of fields, and attach it to the type. */
15267 dwarf2_attach_fields_to_type (struct field_info *fip, struct type *type,
15268 struct dwarf2_cu *cu)
15270 int nfields = fip->nfields;
15272 /* Record the field count, allocate space for the array of fields,
15273 and create blank accessibility bitfields if necessary. */
15274 TYPE_NFIELDS (type) = nfields;
15275 TYPE_FIELDS (type) = (struct field *)
15276 TYPE_ALLOC (type, sizeof (struct field) * nfields);
15277 memset (TYPE_FIELDS (type), 0, sizeof (struct field) * nfields);
15279 if (fip->non_public_fields && cu->language != language_ada)
15281 ALLOCATE_CPLUS_STRUCT_TYPE (type);
15283 TYPE_FIELD_PRIVATE_BITS (type) =
15284 (B_TYPE *) TYPE_ALLOC (type, B_BYTES (nfields));
15285 B_CLRALL (TYPE_FIELD_PRIVATE_BITS (type), nfields);
15287 TYPE_FIELD_PROTECTED_BITS (type) =
15288 (B_TYPE *) TYPE_ALLOC (type, B_BYTES (nfields));
15289 B_CLRALL (TYPE_FIELD_PROTECTED_BITS (type), nfields);
15291 TYPE_FIELD_IGNORE_BITS (type) =
15292 (B_TYPE *) TYPE_ALLOC (type, B_BYTES (nfields));
15293 B_CLRALL (TYPE_FIELD_IGNORE_BITS (type), nfields);
15296 /* If the type has baseclasses, allocate and clear a bit vector for
15297 TYPE_FIELD_VIRTUAL_BITS. */
15298 if (fip->nbaseclasses && cu->language != language_ada)
15300 int num_bytes = B_BYTES (fip->nbaseclasses);
15301 unsigned char *pointer;
15303 ALLOCATE_CPLUS_STRUCT_TYPE (type);
15304 pointer = (unsigned char *) TYPE_ALLOC (type, num_bytes);
15305 TYPE_FIELD_VIRTUAL_BITS (type) = pointer;
15306 B_CLRALL (TYPE_FIELD_VIRTUAL_BITS (type), fip->nbaseclasses);
15307 TYPE_N_BASECLASSES (type) = fip->nbaseclasses;
15310 /* Copy the saved-up fields into the field vector. Start from the head of
15311 the list, adding to the tail of the field array, so that they end up in
15312 the same order in the array in which they were added to the list. */
15313 while (nfields-- > 0)
15315 struct nextfield *fieldp;
15319 fieldp = fip->fields;
15320 fip->fields = fieldp->next;
15324 fieldp = fip->baseclasses;
15325 fip->baseclasses = fieldp->next;
15328 TYPE_FIELD (type, nfields) = fieldp->field;
15329 switch (fieldp->accessibility)
15331 case DW_ACCESS_private:
15332 if (cu->language != language_ada)
15333 SET_TYPE_FIELD_PRIVATE (type, nfields);
15336 case DW_ACCESS_protected:
15337 if (cu->language != language_ada)
15338 SET_TYPE_FIELD_PROTECTED (type, nfields);
15341 case DW_ACCESS_public:
15345 /* Unknown accessibility. Complain and treat it as public. */
15347 complaint (&symfile_complaints, _("unsupported accessibility %d"),
15348 fieldp->accessibility);
15352 if (nfields < fip->nbaseclasses)
15354 switch (fieldp->virtuality)
15356 case DW_VIRTUALITY_virtual:
15357 case DW_VIRTUALITY_pure_virtual:
15358 if (cu->language == language_ada)
15359 error (_("unexpected virtuality in component of Ada type"));
15360 SET_TYPE_FIELD_VIRTUAL (type, nfields);
15367 /* Return true if this member function is a constructor, false
15371 dwarf2_is_constructor (struct die_info *die, struct dwarf2_cu *cu)
15373 const char *fieldname;
15374 const char *type_name;
15377 if (die->parent == NULL)
15380 if (die->parent->tag != DW_TAG_structure_type
15381 && die->parent->tag != DW_TAG_union_type
15382 && die->parent->tag != DW_TAG_class_type)
15385 fieldname = dwarf2_name (die, cu);
15386 type_name = dwarf2_name (die->parent, cu);
15387 if (fieldname == NULL || type_name == NULL)
15390 len = strlen (fieldname);
15391 return (strncmp (fieldname, type_name, len) == 0
15392 && (type_name[len] == '\0' || type_name[len] == '<'));
15395 /* Add a member function to the proper fieldlist. */
15398 dwarf2_add_member_fn (struct field_info *fip, struct die_info *die,
15399 struct type *type, struct dwarf2_cu *cu)
15401 struct objfile *objfile = cu->objfile;
15402 struct attribute *attr;
15403 struct fnfieldlist *flp;
15405 struct fn_field *fnp;
15406 const char *fieldname;
15407 struct nextfnfield *new_fnfield;
15408 struct type *this_type;
15409 enum dwarf_access_attribute accessibility;
15411 if (cu->language == language_ada)
15412 error (_("unexpected member function in Ada type"));
15414 /* Get name of member function. */
15415 fieldname = dwarf2_name (die, cu);
15416 if (fieldname == NULL)
15419 /* Look up member function name in fieldlist. */
15420 for (i = 0; i < fip->nfnfields; i++)
15422 if (strcmp (fip->fnfieldlists[i].name, fieldname) == 0)
15426 /* Create new list element if necessary. */
15427 if (i < fip->nfnfields)
15428 flp = &fip->fnfieldlists[i];
15431 if ((fip->nfnfields % DW_FIELD_ALLOC_CHUNK) == 0)
15433 fip->fnfieldlists = (struct fnfieldlist *)
15434 xrealloc (fip->fnfieldlists,
15435 (fip->nfnfields + DW_FIELD_ALLOC_CHUNK)
15436 * sizeof (struct fnfieldlist));
15437 if (fip->nfnfields == 0)
15438 make_cleanup (free_current_contents, &fip->fnfieldlists);
15440 flp = &fip->fnfieldlists[fip->nfnfields];
15441 flp->name = fieldname;
15444 i = fip->nfnfields++;
15447 /* Create a new member function field and chain it to the field list
15449 new_fnfield = XNEW (struct nextfnfield);
15450 make_cleanup (xfree, new_fnfield);
15451 memset (new_fnfield, 0, sizeof (struct nextfnfield));
15452 new_fnfield->next = flp->head;
15453 flp->head = new_fnfield;
15456 /* Fill in the member function field info. */
15457 fnp = &new_fnfield->fnfield;
15459 /* Delay processing of the physname until later. */
15460 if (cu->language == language_cplus)
15462 add_to_method_list (type, i, flp->length - 1, fieldname,
15467 const char *physname = dwarf2_physname (fieldname, die, cu);
15468 fnp->physname = physname ? physname : "";
15471 fnp->type = alloc_type (objfile);
15472 this_type = read_type_die (die, cu);
15473 if (this_type && TYPE_CODE (this_type) == TYPE_CODE_FUNC)
15475 int nparams = TYPE_NFIELDS (this_type);
15477 /* TYPE is the domain of this method, and THIS_TYPE is the type
15478 of the method itself (TYPE_CODE_METHOD). */
15479 smash_to_method_type (fnp->type, type,
15480 TYPE_TARGET_TYPE (this_type),
15481 TYPE_FIELDS (this_type),
15482 TYPE_NFIELDS (this_type),
15483 TYPE_VARARGS (this_type));
15485 /* Handle static member functions.
15486 Dwarf2 has no clean way to discern C++ static and non-static
15487 member functions. G++ helps GDB by marking the first
15488 parameter for non-static member functions (which is the this
15489 pointer) as artificial. We obtain this information from
15490 read_subroutine_type via TYPE_FIELD_ARTIFICIAL. */
15491 if (nparams == 0 || TYPE_FIELD_ARTIFICIAL (this_type, 0) == 0)
15492 fnp->voffset = VOFFSET_STATIC;
15495 complaint (&symfile_complaints, _("member function type missing for '%s'"),
15496 dwarf2_full_name (fieldname, die, cu));
15498 /* Get fcontext from DW_AT_containing_type if present. */
15499 if (dwarf2_attr (die, DW_AT_containing_type, cu) != NULL)
15500 fnp->fcontext = die_containing_type (die, cu);
15502 /* dwarf2 doesn't have stubbed physical names, so the setting of is_const and
15503 is_volatile is irrelevant, as it is needed by gdb_mangle_name only. */
15505 /* Get accessibility. */
15506 attr = dwarf2_attr (die, DW_AT_accessibility, cu);
15508 accessibility = (enum dwarf_access_attribute) DW_UNSND (attr);
15510 accessibility = dwarf2_default_access_attribute (die, cu);
15511 switch (accessibility)
15513 case DW_ACCESS_private:
15514 fnp->is_private = 1;
15516 case DW_ACCESS_protected:
15517 fnp->is_protected = 1;
15521 /* Check for artificial methods. */
15522 attr = dwarf2_attr (die, DW_AT_artificial, cu);
15523 if (attr && DW_UNSND (attr) != 0)
15524 fnp->is_artificial = 1;
15526 fnp->is_constructor = dwarf2_is_constructor (die, cu);
15528 /* Get index in virtual function table if it is a virtual member
15529 function. For older versions of GCC, this is an offset in the
15530 appropriate virtual table, as specified by DW_AT_containing_type.
15531 For everyone else, it is an expression to be evaluated relative
15532 to the object address. */
15534 attr = dwarf2_attr (die, DW_AT_vtable_elem_location, cu);
15537 if (attr_form_is_block (attr) && DW_BLOCK (attr)->size > 0)
15539 if (DW_BLOCK (attr)->data[0] == DW_OP_constu)
15541 /* Old-style GCC. */
15542 fnp->voffset = decode_locdesc (DW_BLOCK (attr), cu) + 2;
15544 else if (DW_BLOCK (attr)->data[0] == DW_OP_deref
15545 || (DW_BLOCK (attr)->size > 1
15546 && DW_BLOCK (attr)->data[0] == DW_OP_deref_size
15547 && DW_BLOCK (attr)->data[1] == cu->header.addr_size))
15549 fnp->voffset = decode_locdesc (DW_BLOCK (attr), cu);
15550 if ((fnp->voffset % cu->header.addr_size) != 0)
15551 dwarf2_complex_location_expr_complaint ();
15553 fnp->voffset /= cu->header.addr_size;
15557 dwarf2_complex_location_expr_complaint ();
15559 if (!fnp->fcontext)
15561 /* If there is no `this' field and no DW_AT_containing_type,
15562 we cannot actually find a base class context for the
15564 if (TYPE_NFIELDS (this_type) == 0
15565 || !TYPE_FIELD_ARTIFICIAL (this_type, 0))
15567 complaint (&symfile_complaints,
15568 _("cannot determine context for virtual member "
15569 "function \"%s\" (offset %d)"),
15570 fieldname, to_underlying (die->sect_off));
15575 = TYPE_TARGET_TYPE (TYPE_FIELD_TYPE (this_type, 0));
15579 else if (attr_form_is_section_offset (attr))
15581 dwarf2_complex_location_expr_complaint ();
15585 dwarf2_invalid_attrib_class_complaint ("DW_AT_vtable_elem_location",
15591 attr = dwarf2_attr (die, DW_AT_virtuality, cu);
15592 if (attr && DW_UNSND (attr))
15594 /* GCC does this, as of 2008-08-25; PR debug/37237. */
15595 complaint (&symfile_complaints,
15596 _("Member function \"%s\" (offset %d) is virtual "
15597 "but the vtable offset is not specified"),
15598 fieldname, to_underlying (die->sect_off));
15599 ALLOCATE_CPLUS_STRUCT_TYPE (type);
15600 TYPE_CPLUS_DYNAMIC (type) = 1;
15605 /* Create the vector of member function fields, and attach it to the type. */
15608 dwarf2_attach_fn_fields_to_type (struct field_info *fip, struct type *type,
15609 struct dwarf2_cu *cu)
15611 struct fnfieldlist *flp;
15614 if (cu->language == language_ada)
15615 error (_("unexpected member functions in Ada type"));
15617 ALLOCATE_CPLUS_STRUCT_TYPE (type);
15618 TYPE_FN_FIELDLISTS (type) = (struct fn_fieldlist *)
15619 TYPE_ALLOC (type, sizeof (struct fn_fieldlist) * fip->nfnfields);
15621 for (i = 0, flp = fip->fnfieldlists; i < fip->nfnfields; i++, flp++)
15623 struct nextfnfield *nfp = flp->head;
15624 struct fn_fieldlist *fn_flp = &TYPE_FN_FIELDLIST (type, i);
15627 TYPE_FN_FIELDLIST_NAME (type, i) = flp->name;
15628 TYPE_FN_FIELDLIST_LENGTH (type, i) = flp->length;
15629 fn_flp->fn_fields = (struct fn_field *)
15630 TYPE_ALLOC (type, sizeof (struct fn_field) * flp->length);
15631 for (k = flp->length; (k--, nfp); nfp = nfp->next)
15632 fn_flp->fn_fields[k] = nfp->fnfield;
15635 TYPE_NFN_FIELDS (type) = fip->nfnfields;
15638 /* Returns non-zero if NAME is the name of a vtable member in CU's
15639 language, zero otherwise. */
15641 is_vtable_name (const char *name, struct dwarf2_cu *cu)
15643 static const char vptr[] = "_vptr";
15645 /* Look for the C++ form of the vtable. */
15646 if (startswith (name, vptr) && is_cplus_marker (name[sizeof (vptr) - 1]))
15652 /* GCC outputs unnamed structures that are really pointers to member
15653 functions, with the ABI-specified layout. If TYPE describes
15654 such a structure, smash it into a member function type.
15656 GCC shouldn't do this; it should just output pointer to member DIEs.
15657 This is GCC PR debug/28767. */
15660 quirk_gcc_member_function_pointer (struct type *type, struct objfile *objfile)
15662 struct type *pfn_type, *self_type, *new_type;
15664 /* Check for a structure with no name and two children. */
15665 if (TYPE_CODE (type) != TYPE_CODE_STRUCT || TYPE_NFIELDS (type) != 2)
15668 /* Check for __pfn and __delta members. */
15669 if (TYPE_FIELD_NAME (type, 0) == NULL
15670 || strcmp (TYPE_FIELD_NAME (type, 0), "__pfn") != 0
15671 || TYPE_FIELD_NAME (type, 1) == NULL
15672 || strcmp (TYPE_FIELD_NAME (type, 1), "__delta") != 0)
15675 /* Find the type of the method. */
15676 pfn_type = TYPE_FIELD_TYPE (type, 0);
15677 if (pfn_type == NULL
15678 || TYPE_CODE (pfn_type) != TYPE_CODE_PTR
15679 || TYPE_CODE (TYPE_TARGET_TYPE (pfn_type)) != TYPE_CODE_FUNC)
15682 /* Look for the "this" argument. */
15683 pfn_type = TYPE_TARGET_TYPE (pfn_type);
15684 if (TYPE_NFIELDS (pfn_type) == 0
15685 /* || TYPE_FIELD_TYPE (pfn_type, 0) == NULL */
15686 || TYPE_CODE (TYPE_FIELD_TYPE (pfn_type, 0)) != TYPE_CODE_PTR)
15689 self_type = TYPE_TARGET_TYPE (TYPE_FIELD_TYPE (pfn_type, 0));
15690 new_type = alloc_type (objfile);
15691 smash_to_method_type (new_type, self_type, TYPE_TARGET_TYPE (pfn_type),
15692 TYPE_FIELDS (pfn_type), TYPE_NFIELDS (pfn_type),
15693 TYPE_VARARGS (pfn_type));
15694 smash_to_methodptr_type (type, new_type);
15698 /* Called when we find the DIE that starts a structure or union scope
15699 (definition) to create a type for the structure or union. Fill in
15700 the type's name and general properties; the members will not be
15701 processed until process_structure_scope. A symbol table entry for
15702 the type will also not be done until process_structure_scope (assuming
15703 the type has a name).
15705 NOTE: we need to call these functions regardless of whether or not the
15706 DIE has a DW_AT_name attribute, since it might be an anonymous
15707 structure or union. This gets the type entered into our set of
15708 user defined types. */
15710 static struct type *
15711 read_structure_type (struct die_info *die, struct dwarf2_cu *cu)
15713 struct objfile *objfile = cu->objfile;
15715 struct attribute *attr;
15718 /* If the definition of this type lives in .debug_types, read that type.
15719 Don't follow DW_AT_specification though, that will take us back up
15720 the chain and we want to go down. */
15721 attr = dwarf2_attr_no_follow (die, DW_AT_signature);
15724 type = get_DW_AT_signature_type (die, attr, cu);
15726 /* The type's CU may not be the same as CU.
15727 Ensure TYPE is recorded with CU in die_type_hash. */
15728 return set_die_type (die, type, cu);
15731 type = alloc_type (objfile);
15732 INIT_CPLUS_SPECIFIC (type);
15734 name = dwarf2_name (die, cu);
15737 if (cu->language == language_cplus
15738 || cu->language == language_d
15739 || cu->language == language_rust)
15741 const char *full_name = dwarf2_full_name (name, die, cu);
15743 /* dwarf2_full_name might have already finished building the DIE's
15744 type. If so, there is no need to continue. */
15745 if (get_die_type (die, cu) != NULL)
15746 return get_die_type (die, cu);
15748 TYPE_TAG_NAME (type) = full_name;
15749 if (die->tag == DW_TAG_structure_type
15750 || die->tag == DW_TAG_class_type)
15751 TYPE_NAME (type) = TYPE_TAG_NAME (type);
15755 /* The name is already allocated along with this objfile, so
15756 we don't need to duplicate it for the type. */
15757 TYPE_TAG_NAME (type) = name;
15758 if (die->tag == DW_TAG_class_type)
15759 TYPE_NAME (type) = TYPE_TAG_NAME (type);
15763 if (die->tag == DW_TAG_structure_type)
15765 TYPE_CODE (type) = TYPE_CODE_STRUCT;
15767 else if (die->tag == DW_TAG_union_type)
15769 TYPE_CODE (type) = TYPE_CODE_UNION;
15773 TYPE_CODE (type) = TYPE_CODE_STRUCT;
15776 if (cu->language == language_cplus && die->tag == DW_TAG_class_type)
15777 TYPE_DECLARED_CLASS (type) = 1;
15779 attr = dwarf2_attr (die, DW_AT_byte_size, cu);
15782 if (attr_form_is_constant (attr))
15783 TYPE_LENGTH (type) = DW_UNSND (attr);
15786 /* For the moment, dynamic type sizes are not supported
15787 by GDB's struct type. The actual size is determined
15788 on-demand when resolving the type of a given object,
15789 so set the type's length to zero for now. Otherwise,
15790 we record an expression as the length, and that expression
15791 could lead to a very large value, which could eventually
15792 lead to us trying to allocate that much memory when creating
15793 a value of that type. */
15794 TYPE_LENGTH (type) = 0;
15799 TYPE_LENGTH (type) = 0;
15802 if (producer_is_icc_lt_14 (cu) && (TYPE_LENGTH (type) == 0))
15804 /* ICC<14 does not output the required DW_AT_declaration on
15805 incomplete types, but gives them a size of zero. */
15806 TYPE_STUB (type) = 1;
15809 TYPE_STUB_SUPPORTED (type) = 1;
15811 if (die_is_declaration (die, cu))
15812 TYPE_STUB (type) = 1;
15813 else if (attr == NULL && die->child == NULL
15814 && producer_is_realview (cu->producer))
15815 /* RealView does not output the required DW_AT_declaration
15816 on incomplete types. */
15817 TYPE_STUB (type) = 1;
15819 /* We need to add the type field to the die immediately so we don't
15820 infinitely recurse when dealing with pointers to the structure
15821 type within the structure itself. */
15822 set_die_type (die, type, cu);
15824 /* set_die_type should be already done. */
15825 set_descriptive_type (type, die, cu);
15830 /* Finish creating a structure or union type, including filling in
15831 its members and creating a symbol for it. */
15834 process_structure_scope (struct die_info *die, struct dwarf2_cu *cu)
15836 struct objfile *objfile = cu->objfile;
15837 struct die_info *child_die;
15840 type = get_die_type (die, cu);
15842 type = read_structure_type (die, cu);
15844 if (die->child != NULL && ! die_is_declaration (die, cu))
15846 struct field_info fi;
15847 std::vector<struct symbol *> template_args;
15848 struct cleanup *back_to = make_cleanup (null_cleanup, 0);
15850 memset (&fi, 0, sizeof (struct field_info));
15852 child_die = die->child;
15854 while (child_die && child_die->tag)
15856 if (child_die->tag == DW_TAG_member
15857 || child_die->tag == DW_TAG_variable)
15859 /* NOTE: carlton/2002-11-05: A C++ static data member
15860 should be a DW_TAG_member that is a declaration, but
15861 all versions of G++ as of this writing (so through at
15862 least 3.2.1) incorrectly generate DW_TAG_variable
15863 tags for them instead. */
15864 dwarf2_add_field (&fi, child_die, cu);
15866 else if (child_die->tag == DW_TAG_subprogram)
15868 /* Rust doesn't have member functions in the C++ sense.
15869 However, it does emit ordinary functions as children
15870 of a struct DIE. */
15871 if (cu->language == language_rust)
15872 read_func_scope (child_die, cu);
15875 /* C++ member function. */
15876 dwarf2_add_member_fn (&fi, child_die, type, cu);
15879 else if (child_die->tag == DW_TAG_inheritance)
15881 /* C++ base class field. */
15882 dwarf2_add_field (&fi, child_die, cu);
15884 else if (type_can_define_types (child_die))
15885 dwarf2_add_type_defn (&fi, child_die, cu);
15886 else if (child_die->tag == DW_TAG_template_type_param
15887 || child_die->tag == DW_TAG_template_value_param)
15889 struct symbol *arg = new_symbol (child_die, NULL, cu);
15892 template_args.push_back (arg);
15895 child_die = sibling_die (child_die);
15898 /* Attach template arguments to type. */
15899 if (!template_args.empty ())
15901 ALLOCATE_CPLUS_STRUCT_TYPE (type);
15902 TYPE_N_TEMPLATE_ARGUMENTS (type) = template_args.size ();
15903 TYPE_TEMPLATE_ARGUMENTS (type)
15904 = XOBNEWVEC (&objfile->objfile_obstack,
15906 TYPE_N_TEMPLATE_ARGUMENTS (type));
15907 memcpy (TYPE_TEMPLATE_ARGUMENTS (type),
15908 template_args.data (),
15909 (TYPE_N_TEMPLATE_ARGUMENTS (type)
15910 * sizeof (struct symbol *)));
15913 /* Attach fields and member functions to the type. */
15915 dwarf2_attach_fields_to_type (&fi, type, cu);
15918 dwarf2_attach_fn_fields_to_type (&fi, type, cu);
15920 /* Get the type which refers to the base class (possibly this
15921 class itself) which contains the vtable pointer for the current
15922 class from the DW_AT_containing_type attribute. This use of
15923 DW_AT_containing_type is a GNU extension. */
15925 if (dwarf2_attr (die, DW_AT_containing_type, cu) != NULL)
15927 struct type *t = die_containing_type (die, cu);
15929 set_type_vptr_basetype (type, t);
15934 /* Our own class provides vtbl ptr. */
15935 for (i = TYPE_NFIELDS (t) - 1;
15936 i >= TYPE_N_BASECLASSES (t);
15939 const char *fieldname = TYPE_FIELD_NAME (t, i);
15941 if (is_vtable_name (fieldname, cu))
15943 set_type_vptr_fieldno (type, i);
15948 /* Complain if virtual function table field not found. */
15949 if (i < TYPE_N_BASECLASSES (t))
15950 complaint (&symfile_complaints,
15951 _("virtual function table pointer "
15952 "not found when defining class '%s'"),
15953 TYPE_TAG_NAME (type) ? TYPE_TAG_NAME (type) :
15958 set_type_vptr_fieldno (type, TYPE_VPTR_FIELDNO (t));
15961 else if (cu->producer
15962 && startswith (cu->producer, "IBM(R) XL C/C++ Advanced Edition"))
15964 /* The IBM XLC compiler does not provide direct indication
15965 of the containing type, but the vtable pointer is
15966 always named __vfp. */
15970 for (i = TYPE_NFIELDS (type) - 1;
15971 i >= TYPE_N_BASECLASSES (type);
15974 if (strcmp (TYPE_FIELD_NAME (type, i), "__vfp") == 0)
15976 set_type_vptr_fieldno (type, i);
15977 set_type_vptr_basetype (type, type);
15984 /* Copy fi.typedef_field_list linked list elements content into the
15985 allocated array TYPE_TYPEDEF_FIELD_ARRAY (type). */
15986 if (fi.typedef_field_list)
15988 int i = fi.typedef_field_list_count;
15990 ALLOCATE_CPLUS_STRUCT_TYPE (type);
15991 TYPE_TYPEDEF_FIELD_ARRAY (type)
15992 = ((struct decl_field *)
15993 TYPE_ALLOC (type, sizeof (TYPE_TYPEDEF_FIELD (type, 0)) * i));
15994 TYPE_TYPEDEF_FIELD_COUNT (type) = i;
15996 /* Reverse the list order to keep the debug info elements order. */
15999 struct decl_field *dest, *src;
16001 dest = &TYPE_TYPEDEF_FIELD (type, i);
16002 src = &fi.typedef_field_list->field;
16003 fi.typedef_field_list = fi.typedef_field_list->next;
16008 /* Copy fi.nested_types_list linked list elements content into the
16009 allocated array TYPE_NESTED_TYPES_ARRAY (type). */
16010 if (fi.nested_types_list != NULL && cu->language != language_ada)
16012 int i = fi.nested_types_list_count;
16014 ALLOCATE_CPLUS_STRUCT_TYPE (type);
16015 TYPE_NESTED_TYPES_ARRAY (type)
16016 = ((struct decl_field *)
16017 TYPE_ALLOC (type, sizeof (struct decl_field) * i));
16018 TYPE_NESTED_TYPES_COUNT (type) = i;
16020 /* Reverse the list order to keep the debug info elements order. */
16023 struct decl_field *dest, *src;
16025 dest = &TYPE_NESTED_TYPES_FIELD (type, i);
16026 src = &fi.nested_types_list->field;
16027 fi.nested_types_list = fi.nested_types_list->next;
16032 do_cleanups (back_to);
16035 quirk_gcc_member_function_pointer (type, objfile);
16037 /* NOTE: carlton/2004-03-16: GCC 3.4 (or at least one of its
16038 snapshots) has been known to create a die giving a declaration
16039 for a class that has, as a child, a die giving a definition for a
16040 nested class. So we have to process our children even if the
16041 current die is a declaration. Normally, of course, a declaration
16042 won't have any children at all. */
16044 child_die = die->child;
16046 while (child_die != NULL && child_die->tag)
16048 if (child_die->tag == DW_TAG_member
16049 || child_die->tag == DW_TAG_variable
16050 || child_die->tag == DW_TAG_inheritance
16051 || child_die->tag == DW_TAG_template_value_param
16052 || child_die->tag == DW_TAG_template_type_param)
16057 process_die (child_die, cu);
16059 child_die = sibling_die (child_die);
16062 /* Do not consider external references. According to the DWARF standard,
16063 these DIEs are identified by the fact that they have no byte_size
16064 attribute, and a declaration attribute. */
16065 if (dwarf2_attr (die, DW_AT_byte_size, cu) != NULL
16066 || !die_is_declaration (die, cu))
16067 new_symbol (die, type, cu);
16070 /* Assuming DIE is an enumeration type, and TYPE is its associated type,
16071 update TYPE using some information only available in DIE's children. */
16074 update_enumeration_type_from_children (struct die_info *die,
16076 struct dwarf2_cu *cu)
16078 struct die_info *child_die;
16079 int unsigned_enum = 1;
16083 auto_obstack obstack;
16085 for (child_die = die->child;
16086 child_die != NULL && child_die->tag;
16087 child_die = sibling_die (child_die))
16089 struct attribute *attr;
16091 const gdb_byte *bytes;
16092 struct dwarf2_locexpr_baton *baton;
16095 if (child_die->tag != DW_TAG_enumerator)
16098 attr = dwarf2_attr (child_die, DW_AT_const_value, cu);
16102 name = dwarf2_name (child_die, cu);
16104 name = "<anonymous enumerator>";
16106 dwarf2_const_value_attr (attr, type, name, &obstack, cu,
16107 &value, &bytes, &baton);
16113 else if ((mask & value) != 0)
16118 /* If we already know that the enum type is neither unsigned, nor
16119 a flag type, no need to look at the rest of the enumerates. */
16120 if (!unsigned_enum && !flag_enum)
16125 TYPE_UNSIGNED (type) = 1;
16127 TYPE_FLAG_ENUM (type) = 1;
16130 /* Given a DW_AT_enumeration_type die, set its type. We do not
16131 complete the type's fields yet, or create any symbols. */
16133 static struct type *
16134 read_enumeration_type (struct die_info *die, struct dwarf2_cu *cu)
16136 struct objfile *objfile = cu->objfile;
16138 struct attribute *attr;
16141 /* If the definition of this type lives in .debug_types, read that type.
16142 Don't follow DW_AT_specification though, that will take us back up
16143 the chain and we want to go down. */
16144 attr = dwarf2_attr_no_follow (die, DW_AT_signature);
16147 type = get_DW_AT_signature_type (die, attr, cu);
16149 /* The type's CU may not be the same as CU.
16150 Ensure TYPE is recorded with CU in die_type_hash. */
16151 return set_die_type (die, type, cu);
16154 type = alloc_type (objfile);
16156 TYPE_CODE (type) = TYPE_CODE_ENUM;
16157 name = dwarf2_full_name (NULL, die, cu);
16159 TYPE_TAG_NAME (type) = name;
16161 attr = dwarf2_attr (die, DW_AT_type, cu);
16164 struct type *underlying_type = die_type (die, cu);
16166 TYPE_TARGET_TYPE (type) = underlying_type;
16169 attr = dwarf2_attr (die, DW_AT_byte_size, cu);
16172 TYPE_LENGTH (type) = DW_UNSND (attr);
16176 TYPE_LENGTH (type) = 0;
16179 /* The enumeration DIE can be incomplete. In Ada, any type can be
16180 declared as private in the package spec, and then defined only
16181 inside the package body. Such types are known as Taft Amendment
16182 Types. When another package uses such a type, an incomplete DIE
16183 may be generated by the compiler. */
16184 if (die_is_declaration (die, cu))
16185 TYPE_STUB (type) = 1;
16187 /* Finish the creation of this type by using the enum's children.
16188 We must call this even when the underlying type has been provided
16189 so that we can determine if we're looking at a "flag" enum. */
16190 update_enumeration_type_from_children (die, type, cu);
16192 /* If this type has an underlying type that is not a stub, then we
16193 may use its attributes. We always use the "unsigned" attribute
16194 in this situation, because ordinarily we guess whether the type
16195 is unsigned -- but the guess can be wrong and the underlying type
16196 can tell us the reality. However, we defer to a local size
16197 attribute if one exists, because this lets the compiler override
16198 the underlying type if needed. */
16199 if (TYPE_TARGET_TYPE (type) != NULL && !TYPE_STUB (TYPE_TARGET_TYPE (type)))
16201 TYPE_UNSIGNED (type) = TYPE_UNSIGNED (TYPE_TARGET_TYPE (type));
16202 if (TYPE_LENGTH (type) == 0)
16203 TYPE_LENGTH (type) = TYPE_LENGTH (TYPE_TARGET_TYPE (type));
16206 TYPE_DECLARED_CLASS (type) = dwarf2_flag_true_p (die, DW_AT_enum_class, cu);
16208 return set_die_type (die, type, cu);
16211 /* Given a pointer to a die which begins an enumeration, process all
16212 the dies that define the members of the enumeration, and create the
16213 symbol for the enumeration type.
16215 NOTE: We reverse the order of the element list. */
16218 process_enumeration_scope (struct die_info *die, struct dwarf2_cu *cu)
16220 struct type *this_type;
16222 this_type = get_die_type (die, cu);
16223 if (this_type == NULL)
16224 this_type = read_enumeration_type (die, cu);
16226 if (die->child != NULL)
16228 struct die_info *child_die;
16229 struct symbol *sym;
16230 struct field *fields = NULL;
16231 int num_fields = 0;
16234 child_die = die->child;
16235 while (child_die && child_die->tag)
16237 if (child_die->tag != DW_TAG_enumerator)
16239 process_die (child_die, cu);
16243 name = dwarf2_name (child_die, cu);
16246 sym = new_symbol (child_die, this_type, cu);
16248 if ((num_fields % DW_FIELD_ALLOC_CHUNK) == 0)
16250 fields = (struct field *)
16252 (num_fields + DW_FIELD_ALLOC_CHUNK)
16253 * sizeof (struct field));
16256 FIELD_NAME (fields[num_fields]) = SYMBOL_LINKAGE_NAME (sym);
16257 FIELD_TYPE (fields[num_fields]) = NULL;
16258 SET_FIELD_ENUMVAL (fields[num_fields], SYMBOL_VALUE (sym));
16259 FIELD_BITSIZE (fields[num_fields]) = 0;
16265 child_die = sibling_die (child_die);
16270 TYPE_NFIELDS (this_type) = num_fields;
16271 TYPE_FIELDS (this_type) = (struct field *)
16272 TYPE_ALLOC (this_type, sizeof (struct field) * num_fields);
16273 memcpy (TYPE_FIELDS (this_type), fields,
16274 sizeof (struct field) * num_fields);
16279 /* If we are reading an enum from a .debug_types unit, and the enum
16280 is a declaration, and the enum is not the signatured type in the
16281 unit, then we do not want to add a symbol for it. Adding a
16282 symbol would in some cases obscure the true definition of the
16283 enum, giving users an incomplete type when the definition is
16284 actually available. Note that we do not want to do this for all
16285 enums which are just declarations, because C++0x allows forward
16286 enum declarations. */
16287 if (cu->per_cu->is_debug_types
16288 && die_is_declaration (die, cu))
16290 struct signatured_type *sig_type;
16292 sig_type = (struct signatured_type *) cu->per_cu;
16293 gdb_assert (to_underlying (sig_type->type_offset_in_section) != 0);
16294 if (sig_type->type_offset_in_section != die->sect_off)
16298 new_symbol (die, this_type, cu);
16301 /* Extract all information from a DW_TAG_array_type DIE and put it in
16302 the DIE's type field. For now, this only handles one dimensional
16305 static struct type *
16306 read_array_type (struct die_info *die, struct dwarf2_cu *cu)
16308 struct objfile *objfile = cu->objfile;
16309 struct die_info *child_die;
16311 struct type *element_type, *range_type, *index_type;
16312 struct attribute *attr;
16314 unsigned int bit_stride = 0;
16316 element_type = die_type (die, cu);
16318 /* The die_type call above may have already set the type for this DIE. */
16319 type = get_die_type (die, cu);
16323 attr = dwarf2_attr (die, DW_AT_byte_stride, cu);
16325 bit_stride = DW_UNSND (attr) * 8;
16327 attr = dwarf2_attr (die, DW_AT_bit_stride, cu);
16329 bit_stride = DW_UNSND (attr);
16331 /* Irix 6.2 native cc creates array types without children for
16332 arrays with unspecified length. */
16333 if (die->child == NULL)
16335 index_type = objfile_type (objfile)->builtin_int;
16336 range_type = create_static_range_type (NULL, index_type, 0, -1);
16337 type = create_array_type_with_stride (NULL, element_type, range_type,
16339 return set_die_type (die, type, cu);
16342 std::vector<struct type *> range_types;
16343 child_die = die->child;
16344 while (child_die && child_die->tag)
16346 if (child_die->tag == DW_TAG_subrange_type)
16348 struct type *child_type = read_type_die (child_die, cu);
16350 if (child_type != NULL)
16352 /* The range type was succesfully read. Save it for the
16353 array type creation. */
16354 range_types.push_back (child_type);
16357 child_die = sibling_die (child_die);
16360 /* Dwarf2 dimensions are output from left to right, create the
16361 necessary array types in backwards order. */
16363 type = element_type;
16365 if (read_array_order (die, cu) == DW_ORD_col_major)
16369 while (i < range_types.size ())
16370 type = create_array_type_with_stride (NULL, type, range_types[i++],
16375 size_t ndim = range_types.size ();
16377 type = create_array_type_with_stride (NULL, type, range_types[ndim],
16381 /* Understand Dwarf2 support for vector types (like they occur on
16382 the PowerPC w/ AltiVec). Gcc just adds another attribute to the
16383 array type. This is not part of the Dwarf2/3 standard yet, but a
16384 custom vendor extension. The main difference between a regular
16385 array and the vector variant is that vectors are passed by value
16387 attr = dwarf2_attr (die, DW_AT_GNU_vector, cu);
16389 make_vector_type (type);
16391 /* The DIE may have DW_AT_byte_size set. For example an OpenCL
16392 implementation may choose to implement triple vectors using this
16394 attr = dwarf2_attr (die, DW_AT_byte_size, cu);
16397 if (DW_UNSND (attr) >= TYPE_LENGTH (type))
16398 TYPE_LENGTH (type) = DW_UNSND (attr);
16400 complaint (&symfile_complaints,
16401 _("DW_AT_byte_size for array type smaller "
16402 "than the total size of elements"));
16405 name = dwarf2_name (die, cu);
16407 TYPE_NAME (type) = name;
16409 /* Install the type in the die. */
16410 set_die_type (die, type, cu);
16412 /* set_die_type should be already done. */
16413 set_descriptive_type (type, die, cu);
16418 static enum dwarf_array_dim_ordering
16419 read_array_order (struct die_info *die, struct dwarf2_cu *cu)
16421 struct attribute *attr;
16423 attr = dwarf2_attr (die, DW_AT_ordering, cu);
16426 return (enum dwarf_array_dim_ordering) DW_SND (attr);
16428 /* GNU F77 is a special case, as at 08/2004 array type info is the
16429 opposite order to the dwarf2 specification, but data is still
16430 laid out as per normal fortran.
16432 FIXME: dsl/2004-8-20: If G77 is ever fixed, this will also need
16433 version checking. */
16435 if (cu->language == language_fortran
16436 && cu->producer && strstr (cu->producer, "GNU F77"))
16438 return DW_ORD_row_major;
16441 switch (cu->language_defn->la_array_ordering)
16443 case array_column_major:
16444 return DW_ORD_col_major;
16445 case array_row_major:
16447 return DW_ORD_row_major;
16451 /* Extract all information from a DW_TAG_set_type DIE and put it in
16452 the DIE's type field. */
16454 static struct type *
16455 read_set_type (struct die_info *die, struct dwarf2_cu *cu)
16457 struct type *domain_type, *set_type;
16458 struct attribute *attr;
16460 domain_type = die_type (die, cu);
16462 /* The die_type call above may have already set the type for this DIE. */
16463 set_type = get_die_type (die, cu);
16467 set_type = create_set_type (NULL, domain_type);
16469 attr = dwarf2_attr (die, DW_AT_byte_size, cu);
16471 TYPE_LENGTH (set_type) = DW_UNSND (attr);
16473 return set_die_type (die, set_type, cu);
16476 /* A helper for read_common_block that creates a locexpr baton.
16477 SYM is the symbol which we are marking as computed.
16478 COMMON_DIE is the DIE for the common block.
16479 COMMON_LOC is the location expression attribute for the common
16481 MEMBER_LOC is the location expression attribute for the particular
16482 member of the common block that we are processing.
16483 CU is the CU from which the above come. */
16486 mark_common_block_symbol_computed (struct symbol *sym,
16487 struct die_info *common_die,
16488 struct attribute *common_loc,
16489 struct attribute *member_loc,
16490 struct dwarf2_cu *cu)
16492 struct objfile *objfile = dwarf2_per_objfile->objfile;
16493 struct dwarf2_locexpr_baton *baton;
16495 unsigned int cu_off;
16496 enum bfd_endian byte_order = gdbarch_byte_order (get_objfile_arch (objfile));
16497 LONGEST offset = 0;
16499 gdb_assert (common_loc && member_loc);
16500 gdb_assert (attr_form_is_block (common_loc));
16501 gdb_assert (attr_form_is_block (member_loc)
16502 || attr_form_is_constant (member_loc));
16504 baton = XOBNEW (&objfile->objfile_obstack, struct dwarf2_locexpr_baton);
16505 baton->per_cu = cu->per_cu;
16506 gdb_assert (baton->per_cu);
16508 baton->size = 5 /* DW_OP_call4 */ + 1 /* DW_OP_plus */;
16510 if (attr_form_is_constant (member_loc))
16512 offset = dwarf2_get_attr_constant_value (member_loc, 0);
16513 baton->size += 1 /* DW_OP_addr */ + cu->header.addr_size;
16516 baton->size += DW_BLOCK (member_loc)->size;
16518 ptr = (gdb_byte *) obstack_alloc (&objfile->objfile_obstack, baton->size);
16521 *ptr++ = DW_OP_call4;
16522 cu_off = common_die->sect_off - cu->per_cu->sect_off;
16523 store_unsigned_integer (ptr, 4, byte_order, cu_off);
16526 if (attr_form_is_constant (member_loc))
16528 *ptr++ = DW_OP_addr;
16529 store_unsigned_integer (ptr, cu->header.addr_size, byte_order, offset);
16530 ptr += cu->header.addr_size;
16534 /* We have to copy the data here, because DW_OP_call4 will only
16535 use a DW_AT_location attribute. */
16536 memcpy (ptr, DW_BLOCK (member_loc)->data, DW_BLOCK (member_loc)->size);
16537 ptr += DW_BLOCK (member_loc)->size;
16540 *ptr++ = DW_OP_plus;
16541 gdb_assert (ptr - baton->data == baton->size);
16543 SYMBOL_LOCATION_BATON (sym) = baton;
16544 SYMBOL_ACLASS_INDEX (sym) = dwarf2_locexpr_index;
16547 /* Create appropriate locally-scoped variables for all the
16548 DW_TAG_common_block entries. Also create a struct common_block
16549 listing all such variables for `info common'. COMMON_BLOCK_DOMAIN
16550 is used to sepate the common blocks name namespace from regular
16554 read_common_block (struct die_info *die, struct dwarf2_cu *cu)
16556 struct attribute *attr;
16558 attr = dwarf2_attr (die, DW_AT_location, cu);
16561 /* Support the .debug_loc offsets. */
16562 if (attr_form_is_block (attr))
16566 else if (attr_form_is_section_offset (attr))
16568 dwarf2_complex_location_expr_complaint ();
16573 dwarf2_invalid_attrib_class_complaint ("DW_AT_location",
16574 "common block member");
16579 if (die->child != NULL)
16581 struct objfile *objfile = cu->objfile;
16582 struct die_info *child_die;
16583 size_t n_entries = 0, size;
16584 struct common_block *common_block;
16585 struct symbol *sym;
16587 for (child_die = die->child;
16588 child_die && child_die->tag;
16589 child_die = sibling_die (child_die))
16592 size = (sizeof (struct common_block)
16593 + (n_entries - 1) * sizeof (struct symbol *));
16595 = (struct common_block *) obstack_alloc (&objfile->objfile_obstack,
16597 memset (common_block->contents, 0, n_entries * sizeof (struct symbol *));
16598 common_block->n_entries = 0;
16600 for (child_die = die->child;
16601 child_die && child_die->tag;
16602 child_die = sibling_die (child_die))
16604 /* Create the symbol in the DW_TAG_common_block block in the current
16606 sym = new_symbol (child_die, NULL, cu);
16609 struct attribute *member_loc;
16611 common_block->contents[common_block->n_entries++] = sym;
16613 member_loc = dwarf2_attr (child_die, DW_AT_data_member_location,
16617 /* GDB has handled this for a long time, but it is
16618 not specified by DWARF. It seems to have been
16619 emitted by gfortran at least as recently as:
16620 http://gcc.gnu.org/bugzilla/show_bug.cgi?id=23057. */
16621 complaint (&symfile_complaints,
16622 _("Variable in common block has "
16623 "DW_AT_data_member_location "
16624 "- DIE at 0x%x [in module %s]"),
16625 to_underlying (child_die->sect_off),
16626 objfile_name (cu->objfile));
16628 if (attr_form_is_section_offset (member_loc))
16629 dwarf2_complex_location_expr_complaint ();
16630 else if (attr_form_is_constant (member_loc)
16631 || attr_form_is_block (member_loc))
16634 mark_common_block_symbol_computed (sym, die, attr,
16638 dwarf2_complex_location_expr_complaint ();
16643 sym = new_symbol (die, objfile_type (objfile)->builtin_void, cu);
16644 SYMBOL_VALUE_COMMON_BLOCK (sym) = common_block;
16648 /* Create a type for a C++ namespace. */
16650 static struct type *
16651 read_namespace_type (struct die_info *die, struct dwarf2_cu *cu)
16653 struct objfile *objfile = cu->objfile;
16654 const char *previous_prefix, *name;
16658 /* For extensions, reuse the type of the original namespace. */
16659 if (dwarf2_attr (die, DW_AT_extension, cu) != NULL)
16661 struct die_info *ext_die;
16662 struct dwarf2_cu *ext_cu = cu;
16664 ext_die = dwarf2_extension (die, &ext_cu);
16665 type = read_type_die (ext_die, ext_cu);
16667 /* EXT_CU may not be the same as CU.
16668 Ensure TYPE is recorded with CU in die_type_hash. */
16669 return set_die_type (die, type, cu);
16672 name = namespace_name (die, &is_anonymous, cu);
16674 /* Now build the name of the current namespace. */
16676 previous_prefix = determine_prefix (die, cu);
16677 if (previous_prefix[0] != '\0')
16678 name = typename_concat (&objfile->objfile_obstack,
16679 previous_prefix, name, 0, cu);
16681 /* Create the type. */
16682 type = init_type (objfile, TYPE_CODE_NAMESPACE, 0, name);
16683 TYPE_TAG_NAME (type) = TYPE_NAME (type);
16685 return set_die_type (die, type, cu);
16688 /* Read a namespace scope. */
16691 read_namespace (struct die_info *die, struct dwarf2_cu *cu)
16693 struct objfile *objfile = cu->objfile;
16696 /* Add a symbol associated to this if we haven't seen the namespace
16697 before. Also, add a using directive if it's an anonymous
16700 if (dwarf2_attr (die, DW_AT_extension, cu) == NULL)
16704 type = read_type_die (die, cu);
16705 new_symbol (die, type, cu);
16707 namespace_name (die, &is_anonymous, cu);
16710 const char *previous_prefix = determine_prefix (die, cu);
16712 std::vector<const char *> excludes;
16713 add_using_directive (using_directives (cu->language),
16714 previous_prefix, TYPE_NAME (type), NULL,
16715 NULL, excludes, 0, &objfile->objfile_obstack);
16719 if (die->child != NULL)
16721 struct die_info *child_die = die->child;
16723 while (child_die && child_die->tag)
16725 process_die (child_die, cu);
16726 child_die = sibling_die (child_die);
16731 /* Read a Fortran module as type. This DIE can be only a declaration used for
16732 imported module. Still we need that type as local Fortran "use ... only"
16733 declaration imports depend on the created type in determine_prefix. */
16735 static struct type *
16736 read_module_type (struct die_info *die, struct dwarf2_cu *cu)
16738 struct objfile *objfile = cu->objfile;
16739 const char *module_name;
16742 module_name = dwarf2_name (die, cu);
16744 complaint (&symfile_complaints,
16745 _("DW_TAG_module has no name, offset 0x%x"),
16746 to_underlying (die->sect_off));
16747 type = init_type (objfile, TYPE_CODE_MODULE, 0, module_name);
16749 /* determine_prefix uses TYPE_TAG_NAME. */
16750 TYPE_TAG_NAME (type) = TYPE_NAME (type);
16752 return set_die_type (die, type, cu);
16755 /* Read a Fortran module. */
16758 read_module (struct die_info *die, struct dwarf2_cu *cu)
16760 struct die_info *child_die = die->child;
16763 type = read_type_die (die, cu);
16764 new_symbol (die, type, cu);
16766 while (child_die && child_die->tag)
16768 process_die (child_die, cu);
16769 child_die = sibling_die (child_die);
16773 /* Return the name of the namespace represented by DIE. Set
16774 *IS_ANONYMOUS to tell whether or not the namespace is an anonymous
16777 static const char *
16778 namespace_name (struct die_info *die, int *is_anonymous, struct dwarf2_cu *cu)
16780 struct die_info *current_die;
16781 const char *name = NULL;
16783 /* Loop through the extensions until we find a name. */
16785 for (current_die = die;
16786 current_die != NULL;
16787 current_die = dwarf2_extension (die, &cu))
16789 /* We don't use dwarf2_name here so that we can detect the absence
16790 of a name -> anonymous namespace. */
16791 name = dwarf2_string_attr (die, DW_AT_name, cu);
16797 /* Is it an anonymous namespace? */
16799 *is_anonymous = (name == NULL);
16801 name = CP_ANONYMOUS_NAMESPACE_STR;
16806 /* Extract all information from a DW_TAG_pointer_type DIE and add to
16807 the user defined type vector. */
16809 static struct type *
16810 read_tag_pointer_type (struct die_info *die, struct dwarf2_cu *cu)
16812 struct gdbarch *gdbarch = get_objfile_arch (cu->objfile);
16813 struct comp_unit_head *cu_header = &cu->header;
16815 struct attribute *attr_byte_size;
16816 struct attribute *attr_address_class;
16817 int byte_size, addr_class;
16818 struct type *target_type;
16820 target_type = die_type (die, cu);
16822 /* The die_type call above may have already set the type for this DIE. */
16823 type = get_die_type (die, cu);
16827 type = lookup_pointer_type (target_type);
16829 attr_byte_size = dwarf2_attr (die, DW_AT_byte_size, cu);
16830 if (attr_byte_size)
16831 byte_size = DW_UNSND (attr_byte_size);
16833 byte_size = cu_header->addr_size;
16835 attr_address_class = dwarf2_attr (die, DW_AT_address_class, cu);
16836 if (attr_address_class)
16837 addr_class = DW_UNSND (attr_address_class);
16839 addr_class = DW_ADDR_none;
16841 /* If the pointer size or address class is different than the
16842 default, create a type variant marked as such and set the
16843 length accordingly. */
16844 if (TYPE_LENGTH (type) != byte_size || addr_class != DW_ADDR_none)
16846 if (gdbarch_address_class_type_flags_p (gdbarch))
16850 type_flags = gdbarch_address_class_type_flags
16851 (gdbarch, byte_size, addr_class);
16852 gdb_assert ((type_flags & ~TYPE_INSTANCE_FLAG_ADDRESS_CLASS_ALL)
16854 type = make_type_with_address_space (type, type_flags);
16856 else if (TYPE_LENGTH (type) != byte_size)
16858 complaint (&symfile_complaints,
16859 _("invalid pointer size %d"), byte_size);
16863 /* Should we also complain about unhandled address classes? */
16867 TYPE_LENGTH (type) = byte_size;
16868 return set_die_type (die, type, cu);
16871 /* Extract all information from a DW_TAG_ptr_to_member_type DIE and add to
16872 the user defined type vector. */
16874 static struct type *
16875 read_tag_ptr_to_member_type (struct die_info *die, struct dwarf2_cu *cu)
16878 struct type *to_type;
16879 struct type *domain;
16881 to_type = die_type (die, cu);
16882 domain = die_containing_type (die, cu);
16884 /* The calls above may have already set the type for this DIE. */
16885 type = get_die_type (die, cu);
16889 if (TYPE_CODE (check_typedef (to_type)) == TYPE_CODE_METHOD)
16890 type = lookup_methodptr_type (to_type);
16891 else if (TYPE_CODE (check_typedef (to_type)) == TYPE_CODE_FUNC)
16893 struct type *new_type = alloc_type (cu->objfile);
16895 smash_to_method_type (new_type, domain, TYPE_TARGET_TYPE (to_type),
16896 TYPE_FIELDS (to_type), TYPE_NFIELDS (to_type),
16897 TYPE_VARARGS (to_type));
16898 type = lookup_methodptr_type (new_type);
16901 type = lookup_memberptr_type (to_type, domain);
16903 return set_die_type (die, type, cu);
16906 /* Extract all information from a DW_TAG_{rvalue_,}reference_type DIE and add to
16907 the user defined type vector. */
16909 static struct type *
16910 read_tag_reference_type (struct die_info *die, struct dwarf2_cu *cu,
16911 enum type_code refcode)
16913 struct comp_unit_head *cu_header = &cu->header;
16914 struct type *type, *target_type;
16915 struct attribute *attr;
16917 gdb_assert (refcode == TYPE_CODE_REF || refcode == TYPE_CODE_RVALUE_REF);
16919 target_type = die_type (die, cu);
16921 /* The die_type call above may have already set the type for this DIE. */
16922 type = get_die_type (die, cu);
16926 type = lookup_reference_type (target_type, refcode);
16927 attr = dwarf2_attr (die, DW_AT_byte_size, cu);
16930 TYPE_LENGTH (type) = DW_UNSND (attr);
16934 TYPE_LENGTH (type) = cu_header->addr_size;
16936 return set_die_type (die, type, cu);
16939 /* Add the given cv-qualifiers to the element type of the array. GCC
16940 outputs DWARF type qualifiers that apply to an array, not the
16941 element type. But GDB relies on the array element type to carry
16942 the cv-qualifiers. This mimics section 6.7.3 of the C99
16945 static struct type *
16946 add_array_cv_type (struct die_info *die, struct dwarf2_cu *cu,
16947 struct type *base_type, int cnst, int voltl)
16949 struct type *el_type, *inner_array;
16951 base_type = copy_type (base_type);
16952 inner_array = base_type;
16954 while (TYPE_CODE (TYPE_TARGET_TYPE (inner_array)) == TYPE_CODE_ARRAY)
16956 TYPE_TARGET_TYPE (inner_array) =
16957 copy_type (TYPE_TARGET_TYPE (inner_array));
16958 inner_array = TYPE_TARGET_TYPE (inner_array);
16961 el_type = TYPE_TARGET_TYPE (inner_array);
16962 cnst |= TYPE_CONST (el_type);
16963 voltl |= TYPE_VOLATILE (el_type);
16964 TYPE_TARGET_TYPE (inner_array) = make_cv_type (cnst, voltl, el_type, NULL);
16966 return set_die_type (die, base_type, cu);
16969 static struct type *
16970 read_tag_const_type (struct die_info *die, struct dwarf2_cu *cu)
16972 struct type *base_type, *cv_type;
16974 base_type = die_type (die, cu);
16976 /* The die_type call above may have already set the type for this DIE. */
16977 cv_type = get_die_type (die, cu);
16981 /* In case the const qualifier is applied to an array type, the element type
16982 is so qualified, not the array type (section 6.7.3 of C99). */
16983 if (TYPE_CODE (base_type) == TYPE_CODE_ARRAY)
16984 return add_array_cv_type (die, cu, base_type, 1, 0);
16986 cv_type = make_cv_type (1, TYPE_VOLATILE (base_type), base_type, 0);
16987 return set_die_type (die, cv_type, cu);
16990 static struct type *
16991 read_tag_volatile_type (struct die_info *die, struct dwarf2_cu *cu)
16993 struct type *base_type, *cv_type;
16995 base_type = die_type (die, cu);
16997 /* The die_type call above may have already set the type for this DIE. */
16998 cv_type = get_die_type (die, cu);
17002 /* In case the volatile qualifier is applied to an array type, the
17003 element type is so qualified, not the array type (section 6.7.3
17005 if (TYPE_CODE (base_type) == TYPE_CODE_ARRAY)
17006 return add_array_cv_type (die, cu, base_type, 0, 1);
17008 cv_type = make_cv_type (TYPE_CONST (base_type), 1, base_type, 0);
17009 return set_die_type (die, cv_type, cu);
17012 /* Handle DW_TAG_restrict_type. */
17014 static struct type *
17015 read_tag_restrict_type (struct die_info *die, struct dwarf2_cu *cu)
17017 struct type *base_type, *cv_type;
17019 base_type = die_type (die, cu);
17021 /* The die_type call above may have already set the type for this DIE. */
17022 cv_type = get_die_type (die, cu);
17026 cv_type = make_restrict_type (base_type);
17027 return set_die_type (die, cv_type, cu);
17030 /* Handle DW_TAG_atomic_type. */
17032 static struct type *
17033 read_tag_atomic_type (struct die_info *die, struct dwarf2_cu *cu)
17035 struct type *base_type, *cv_type;
17037 base_type = die_type (die, cu);
17039 /* The die_type call above may have already set the type for this DIE. */
17040 cv_type = get_die_type (die, cu);
17044 cv_type = make_atomic_type (base_type);
17045 return set_die_type (die, cv_type, cu);
17048 /* Extract all information from a DW_TAG_string_type DIE and add to
17049 the user defined type vector. It isn't really a user defined type,
17050 but it behaves like one, with other DIE's using an AT_user_def_type
17051 attribute to reference it. */
17053 static struct type *
17054 read_tag_string_type (struct die_info *die, struct dwarf2_cu *cu)
17056 struct objfile *objfile = cu->objfile;
17057 struct gdbarch *gdbarch = get_objfile_arch (objfile);
17058 struct type *type, *range_type, *index_type, *char_type;
17059 struct attribute *attr;
17060 unsigned int length;
17062 attr = dwarf2_attr (die, DW_AT_string_length, cu);
17065 length = DW_UNSND (attr);
17069 /* Check for the DW_AT_byte_size attribute. */
17070 attr = dwarf2_attr (die, DW_AT_byte_size, cu);
17073 length = DW_UNSND (attr);
17081 index_type = objfile_type (objfile)->builtin_int;
17082 range_type = create_static_range_type (NULL, index_type, 1, length);
17083 char_type = language_string_char_type (cu->language_defn, gdbarch);
17084 type = create_string_type (NULL, char_type, range_type);
17086 return set_die_type (die, type, cu);
17089 /* Assuming that DIE corresponds to a function, returns nonzero
17090 if the function is prototyped. */
17093 prototyped_function_p (struct die_info *die, struct dwarf2_cu *cu)
17095 struct attribute *attr;
17097 attr = dwarf2_attr (die, DW_AT_prototyped, cu);
17098 if (attr && (DW_UNSND (attr) != 0))
17101 /* The DWARF standard implies that the DW_AT_prototyped attribute
17102 is only meaninful for C, but the concept also extends to other
17103 languages that allow unprototyped functions (Eg: Objective C).
17104 For all other languages, assume that functions are always
17106 if (cu->language != language_c
17107 && cu->language != language_objc
17108 && cu->language != language_opencl)
17111 /* RealView does not emit DW_AT_prototyped. We can not distinguish
17112 prototyped and unprototyped functions; default to prototyped,
17113 since that is more common in modern code (and RealView warns
17114 about unprototyped functions). */
17115 if (producer_is_realview (cu->producer))
17121 /* Handle DIES due to C code like:
17125 int (*funcp)(int a, long l);
17129 ('funcp' generates a DW_TAG_subroutine_type DIE). */
17131 static struct type *
17132 read_subroutine_type (struct die_info *die, struct dwarf2_cu *cu)
17134 struct objfile *objfile = cu->objfile;
17135 struct type *type; /* Type that this function returns. */
17136 struct type *ftype; /* Function that returns above type. */
17137 struct attribute *attr;
17139 type = die_type (die, cu);
17141 /* The die_type call above may have already set the type for this DIE. */
17142 ftype = get_die_type (die, cu);
17146 ftype = lookup_function_type (type);
17148 if (prototyped_function_p (die, cu))
17149 TYPE_PROTOTYPED (ftype) = 1;
17151 /* Store the calling convention in the type if it's available in
17152 the subroutine die. Otherwise set the calling convention to
17153 the default value DW_CC_normal. */
17154 attr = dwarf2_attr (die, DW_AT_calling_convention, cu);
17156 TYPE_CALLING_CONVENTION (ftype) = DW_UNSND (attr);
17157 else if (cu->producer && strstr (cu->producer, "IBM XL C for OpenCL"))
17158 TYPE_CALLING_CONVENTION (ftype) = DW_CC_GDB_IBM_OpenCL;
17160 TYPE_CALLING_CONVENTION (ftype) = DW_CC_normal;
17162 /* Record whether the function returns normally to its caller or not
17163 if the DWARF producer set that information. */
17164 attr = dwarf2_attr (die, DW_AT_noreturn, cu);
17165 if (attr && (DW_UNSND (attr) != 0))
17166 TYPE_NO_RETURN (ftype) = 1;
17168 /* We need to add the subroutine type to the die immediately so
17169 we don't infinitely recurse when dealing with parameters
17170 declared as the same subroutine type. */
17171 set_die_type (die, ftype, cu);
17173 if (die->child != NULL)
17175 struct type *void_type = objfile_type (objfile)->builtin_void;
17176 struct die_info *child_die;
17177 int nparams, iparams;
17179 /* Count the number of parameters.
17180 FIXME: GDB currently ignores vararg functions, but knows about
17181 vararg member functions. */
17183 child_die = die->child;
17184 while (child_die && child_die->tag)
17186 if (child_die->tag == DW_TAG_formal_parameter)
17188 else if (child_die->tag == DW_TAG_unspecified_parameters)
17189 TYPE_VARARGS (ftype) = 1;
17190 child_die = sibling_die (child_die);
17193 /* Allocate storage for parameters and fill them in. */
17194 TYPE_NFIELDS (ftype) = nparams;
17195 TYPE_FIELDS (ftype) = (struct field *)
17196 TYPE_ZALLOC (ftype, nparams * sizeof (struct field));
17198 /* TYPE_FIELD_TYPE must never be NULL. Pre-fill the array to ensure it
17199 even if we error out during the parameters reading below. */
17200 for (iparams = 0; iparams < nparams; iparams++)
17201 TYPE_FIELD_TYPE (ftype, iparams) = void_type;
17204 child_die = die->child;
17205 while (child_die && child_die->tag)
17207 if (child_die->tag == DW_TAG_formal_parameter)
17209 struct type *arg_type;
17211 /* DWARF version 2 has no clean way to discern C++
17212 static and non-static member functions. G++ helps
17213 GDB by marking the first parameter for non-static
17214 member functions (which is the this pointer) as
17215 artificial. We pass this information to
17216 dwarf2_add_member_fn via TYPE_FIELD_ARTIFICIAL.
17218 DWARF version 3 added DW_AT_object_pointer, which GCC
17219 4.5 does not yet generate. */
17220 attr = dwarf2_attr (child_die, DW_AT_artificial, cu);
17222 TYPE_FIELD_ARTIFICIAL (ftype, iparams) = DW_UNSND (attr);
17224 TYPE_FIELD_ARTIFICIAL (ftype, iparams) = 0;
17225 arg_type = die_type (child_die, cu);
17227 /* RealView does not mark THIS as const, which the testsuite
17228 expects. GCC marks THIS as const in method definitions,
17229 but not in the class specifications (GCC PR 43053). */
17230 if (cu->language == language_cplus && !TYPE_CONST (arg_type)
17231 && TYPE_FIELD_ARTIFICIAL (ftype, iparams))
17234 struct dwarf2_cu *arg_cu = cu;
17235 const char *name = dwarf2_name (child_die, cu);
17237 attr = dwarf2_attr (die, DW_AT_object_pointer, cu);
17240 /* If the compiler emits this, use it. */
17241 if (follow_die_ref (die, attr, &arg_cu) == child_die)
17244 else if (name && strcmp (name, "this") == 0)
17245 /* Function definitions will have the argument names. */
17247 else if (name == NULL && iparams == 0)
17248 /* Declarations may not have the names, so like
17249 elsewhere in GDB, assume an artificial first
17250 argument is "this". */
17254 arg_type = make_cv_type (1, TYPE_VOLATILE (arg_type),
17258 TYPE_FIELD_TYPE (ftype, iparams) = arg_type;
17261 child_die = sibling_die (child_die);
17268 static struct type *
17269 read_typedef (struct die_info *die, struct dwarf2_cu *cu)
17271 struct objfile *objfile = cu->objfile;
17272 const char *name = NULL;
17273 struct type *this_type, *target_type;
17275 name = dwarf2_full_name (NULL, die, cu);
17276 this_type = init_type (objfile, TYPE_CODE_TYPEDEF, 0, name);
17277 TYPE_TARGET_STUB (this_type) = 1;
17278 set_die_type (die, this_type, cu);
17279 target_type = die_type (die, cu);
17280 if (target_type != this_type)
17281 TYPE_TARGET_TYPE (this_type) = target_type;
17284 /* Self-referential typedefs are, it seems, not allowed by the DWARF
17285 spec and cause infinite loops in GDB. */
17286 complaint (&symfile_complaints,
17287 _("Self-referential DW_TAG_typedef "
17288 "- DIE at 0x%x [in module %s]"),
17289 to_underlying (die->sect_off), objfile_name (objfile));
17290 TYPE_TARGET_TYPE (this_type) = NULL;
17295 /* Allocate a floating-point type of size BITS and name NAME. Pass NAME_HINT
17296 (which may be different from NAME) to the architecture back-end to allow
17297 it to guess the correct format if necessary. */
17299 static struct type *
17300 dwarf2_init_float_type (struct objfile *objfile, int bits, const char *name,
17301 const char *name_hint)
17303 struct gdbarch *gdbarch = get_objfile_arch (objfile);
17304 const struct floatformat **format;
17307 format = gdbarch_floatformat_for_type (gdbarch, name_hint, bits);
17309 type = init_float_type (objfile, bits, name, format);
17311 type = init_type (objfile, TYPE_CODE_ERROR, bits, name);
17316 /* Find a representation of a given base type and install
17317 it in the TYPE field of the die. */
17319 static struct type *
17320 read_base_type (struct die_info *die, struct dwarf2_cu *cu)
17322 struct objfile *objfile = cu->objfile;
17324 struct attribute *attr;
17325 int encoding = 0, bits = 0;
17328 attr = dwarf2_attr (die, DW_AT_encoding, cu);
17331 encoding = DW_UNSND (attr);
17333 attr = dwarf2_attr (die, DW_AT_byte_size, cu);
17336 bits = DW_UNSND (attr) * TARGET_CHAR_BIT;
17338 name = dwarf2_name (die, cu);
17341 complaint (&symfile_complaints,
17342 _("DW_AT_name missing from DW_TAG_base_type"));
17347 case DW_ATE_address:
17348 /* Turn DW_ATE_address into a void * pointer. */
17349 type = init_type (objfile, TYPE_CODE_VOID, TARGET_CHAR_BIT, NULL);
17350 type = init_pointer_type (objfile, bits, name, type);
17352 case DW_ATE_boolean:
17353 type = init_boolean_type (objfile, bits, 1, name);
17355 case DW_ATE_complex_float:
17356 type = dwarf2_init_float_type (objfile, bits / 2, NULL, name);
17357 type = init_complex_type (objfile, name, type);
17359 case DW_ATE_decimal_float:
17360 type = init_decfloat_type (objfile, bits, name);
17363 type = dwarf2_init_float_type (objfile, bits, name, name);
17365 case DW_ATE_signed:
17366 type = init_integer_type (objfile, bits, 0, name);
17368 case DW_ATE_unsigned:
17369 if (cu->language == language_fortran
17371 && startswith (name, "character("))
17372 type = init_character_type (objfile, bits, 1, name);
17374 type = init_integer_type (objfile, bits, 1, name);
17376 case DW_ATE_signed_char:
17377 if (cu->language == language_ada || cu->language == language_m2
17378 || cu->language == language_pascal
17379 || cu->language == language_fortran)
17380 type = init_character_type (objfile, bits, 0, name);
17382 type = init_integer_type (objfile, bits, 0, name);
17384 case DW_ATE_unsigned_char:
17385 if (cu->language == language_ada || cu->language == language_m2
17386 || cu->language == language_pascal
17387 || cu->language == language_fortran
17388 || cu->language == language_rust)
17389 type = init_character_type (objfile, bits, 1, name);
17391 type = init_integer_type (objfile, bits, 1, name);
17395 gdbarch *arch = get_objfile_arch (objfile);
17398 type = builtin_type (arch)->builtin_char16;
17399 else if (bits == 32)
17400 type = builtin_type (arch)->builtin_char32;
17403 complaint (&symfile_complaints,
17404 _("unsupported DW_ATE_UTF bit size: '%d'"),
17406 type = init_integer_type (objfile, bits, 1, name);
17408 return set_die_type (die, type, cu);
17413 complaint (&symfile_complaints, _("unsupported DW_AT_encoding: '%s'"),
17414 dwarf_type_encoding_name (encoding));
17415 type = init_type (objfile, TYPE_CODE_ERROR, bits, name);
17419 if (name && strcmp (name, "char") == 0)
17420 TYPE_NOSIGN (type) = 1;
17422 return set_die_type (die, type, cu);
17425 /* Parse dwarf attribute if it's a block, reference or constant and put the
17426 resulting value of the attribute into struct bound_prop.
17427 Returns 1 if ATTR could be resolved into PROP, 0 otherwise. */
17430 attr_to_dynamic_prop (const struct attribute *attr, struct die_info *die,
17431 struct dwarf2_cu *cu, struct dynamic_prop *prop)
17433 struct dwarf2_property_baton *baton;
17434 struct obstack *obstack = &cu->objfile->objfile_obstack;
17436 if (attr == NULL || prop == NULL)
17439 if (attr_form_is_block (attr))
17441 baton = XOBNEW (obstack, struct dwarf2_property_baton);
17442 baton->referenced_type = NULL;
17443 baton->locexpr.per_cu = cu->per_cu;
17444 baton->locexpr.size = DW_BLOCK (attr)->size;
17445 baton->locexpr.data = DW_BLOCK (attr)->data;
17446 prop->data.baton = baton;
17447 prop->kind = PROP_LOCEXPR;
17448 gdb_assert (prop->data.baton != NULL);
17450 else if (attr_form_is_ref (attr))
17452 struct dwarf2_cu *target_cu = cu;
17453 struct die_info *target_die;
17454 struct attribute *target_attr;
17456 target_die = follow_die_ref (die, attr, &target_cu);
17457 target_attr = dwarf2_attr (target_die, DW_AT_location, target_cu);
17458 if (target_attr == NULL)
17459 target_attr = dwarf2_attr (target_die, DW_AT_data_member_location,
17461 if (target_attr == NULL)
17464 switch (target_attr->name)
17466 case DW_AT_location:
17467 if (attr_form_is_section_offset (target_attr))
17469 baton = XOBNEW (obstack, struct dwarf2_property_baton);
17470 baton->referenced_type = die_type (target_die, target_cu);
17471 fill_in_loclist_baton (cu, &baton->loclist, target_attr);
17472 prop->data.baton = baton;
17473 prop->kind = PROP_LOCLIST;
17474 gdb_assert (prop->data.baton != NULL);
17476 else if (attr_form_is_block (target_attr))
17478 baton = XOBNEW (obstack, struct dwarf2_property_baton);
17479 baton->referenced_type = die_type (target_die, target_cu);
17480 baton->locexpr.per_cu = cu->per_cu;
17481 baton->locexpr.size = DW_BLOCK (target_attr)->size;
17482 baton->locexpr.data = DW_BLOCK (target_attr)->data;
17483 prop->data.baton = baton;
17484 prop->kind = PROP_LOCEXPR;
17485 gdb_assert (prop->data.baton != NULL);
17489 dwarf2_invalid_attrib_class_complaint ("DW_AT_location",
17490 "dynamic property");
17494 case DW_AT_data_member_location:
17498 if (!handle_data_member_location (target_die, target_cu,
17502 baton = XOBNEW (obstack, struct dwarf2_property_baton);
17503 baton->referenced_type = read_type_die (target_die->parent,
17505 baton->offset_info.offset = offset;
17506 baton->offset_info.type = die_type (target_die, target_cu);
17507 prop->data.baton = baton;
17508 prop->kind = PROP_ADDR_OFFSET;
17513 else if (attr_form_is_constant (attr))
17515 prop->data.const_val = dwarf2_get_attr_constant_value (attr, 0);
17516 prop->kind = PROP_CONST;
17520 dwarf2_invalid_attrib_class_complaint (dwarf_form_name (attr->form),
17521 dwarf2_name (die, cu));
17528 /* Read the given DW_AT_subrange DIE. */
17530 static struct type *
17531 read_subrange_type (struct die_info *die, struct dwarf2_cu *cu)
17533 struct type *base_type, *orig_base_type;
17534 struct type *range_type;
17535 struct attribute *attr;
17536 struct dynamic_prop low, high;
17537 int low_default_is_valid;
17538 int high_bound_is_count = 0;
17540 LONGEST negative_mask;
17542 orig_base_type = die_type (die, cu);
17543 /* If ORIG_BASE_TYPE is a typedef, it will not be TYPE_UNSIGNED,
17544 whereas the real type might be. So, we use ORIG_BASE_TYPE when
17545 creating the range type, but we use the result of check_typedef
17546 when examining properties of the type. */
17547 base_type = check_typedef (orig_base_type);
17549 /* The die_type call above may have already set the type for this DIE. */
17550 range_type = get_die_type (die, cu);
17554 low.kind = PROP_CONST;
17555 high.kind = PROP_CONST;
17556 high.data.const_val = 0;
17558 /* Set LOW_DEFAULT_IS_VALID if current language and DWARF version allow
17559 omitting DW_AT_lower_bound. */
17560 switch (cu->language)
17563 case language_cplus:
17564 low.data.const_val = 0;
17565 low_default_is_valid = 1;
17567 case language_fortran:
17568 low.data.const_val = 1;
17569 low_default_is_valid = 1;
17572 case language_objc:
17573 case language_rust:
17574 low.data.const_val = 0;
17575 low_default_is_valid = (cu->header.version >= 4);
17579 case language_pascal:
17580 low.data.const_val = 1;
17581 low_default_is_valid = (cu->header.version >= 4);
17584 low.data.const_val = 0;
17585 low_default_is_valid = 0;
17589 attr = dwarf2_attr (die, DW_AT_lower_bound, cu);
17591 attr_to_dynamic_prop (attr, die, cu, &low);
17592 else if (!low_default_is_valid)
17593 complaint (&symfile_complaints, _("Missing DW_AT_lower_bound "
17594 "- DIE at 0x%x [in module %s]"),
17595 to_underlying (die->sect_off), objfile_name (cu->objfile));
17597 attr = dwarf2_attr (die, DW_AT_upper_bound, cu);
17598 if (!attr_to_dynamic_prop (attr, die, cu, &high))
17600 attr = dwarf2_attr (die, DW_AT_count, cu);
17601 if (attr_to_dynamic_prop (attr, die, cu, &high))
17603 /* If bounds are constant do the final calculation here. */
17604 if (low.kind == PROP_CONST && high.kind == PROP_CONST)
17605 high.data.const_val = low.data.const_val + high.data.const_val - 1;
17607 high_bound_is_count = 1;
17611 /* Dwarf-2 specifications explicitly allows to create subrange types
17612 without specifying a base type.
17613 In that case, the base type must be set to the type of
17614 the lower bound, upper bound or count, in that order, if any of these
17615 three attributes references an object that has a type.
17616 If no base type is found, the Dwarf-2 specifications say that
17617 a signed integer type of size equal to the size of an address should
17619 For the following C code: `extern char gdb_int [];'
17620 GCC produces an empty range DIE.
17621 FIXME: muller/2010-05-28: Possible references to object for low bound,
17622 high bound or count are not yet handled by this code. */
17623 if (TYPE_CODE (base_type) == TYPE_CODE_VOID)
17625 struct objfile *objfile = cu->objfile;
17626 struct gdbarch *gdbarch = get_objfile_arch (objfile);
17627 int addr_size = gdbarch_addr_bit (gdbarch) /8;
17628 struct type *int_type = objfile_type (objfile)->builtin_int;
17630 /* Test "int", "long int", and "long long int" objfile types,
17631 and select the first one having a size above or equal to the
17632 architecture address size. */
17633 if (int_type && TYPE_LENGTH (int_type) >= addr_size)
17634 base_type = int_type;
17637 int_type = objfile_type (objfile)->builtin_long;
17638 if (int_type && TYPE_LENGTH (int_type) >= addr_size)
17639 base_type = int_type;
17642 int_type = objfile_type (objfile)->builtin_long_long;
17643 if (int_type && TYPE_LENGTH (int_type) >= addr_size)
17644 base_type = int_type;
17649 /* Normally, the DWARF producers are expected to use a signed
17650 constant form (Eg. DW_FORM_sdata) to express negative bounds.
17651 But this is unfortunately not always the case, as witnessed
17652 with GCC, for instance, where the ambiguous DW_FORM_dataN form
17653 is used instead. To work around that ambiguity, we treat
17654 the bounds as signed, and thus sign-extend their values, when
17655 the base type is signed. */
17657 -((LONGEST) 1 << (TYPE_LENGTH (base_type) * TARGET_CHAR_BIT - 1));
17658 if (low.kind == PROP_CONST
17659 && !TYPE_UNSIGNED (base_type) && (low.data.const_val & negative_mask))
17660 low.data.const_val |= negative_mask;
17661 if (high.kind == PROP_CONST
17662 && !TYPE_UNSIGNED (base_type) && (high.data.const_val & negative_mask))
17663 high.data.const_val |= negative_mask;
17665 range_type = create_range_type (NULL, orig_base_type, &low, &high);
17667 if (high_bound_is_count)
17668 TYPE_RANGE_DATA (range_type)->flag_upper_bound_is_count = 1;
17670 /* Ada expects an empty array on no boundary attributes. */
17671 if (attr == NULL && cu->language != language_ada)
17672 TYPE_HIGH_BOUND_KIND (range_type) = PROP_UNDEFINED;
17674 name = dwarf2_name (die, cu);
17676 TYPE_NAME (range_type) = name;
17678 attr = dwarf2_attr (die, DW_AT_byte_size, cu);
17680 TYPE_LENGTH (range_type) = DW_UNSND (attr);
17682 set_die_type (die, range_type, cu);
17684 /* set_die_type should be already done. */
17685 set_descriptive_type (range_type, die, cu);
17690 static struct type *
17691 read_unspecified_type (struct die_info *die, struct dwarf2_cu *cu)
17695 /* For now, we only support the C meaning of an unspecified type: void. */
17697 type = init_type (cu->objfile, TYPE_CODE_VOID, 0, NULL);
17698 TYPE_NAME (type) = dwarf2_name (die, cu);
17700 return set_die_type (die, type, cu);
17703 /* Read a single die and all its descendents. Set the die's sibling
17704 field to NULL; set other fields in the die correctly, and set all
17705 of the descendents' fields correctly. Set *NEW_INFO_PTR to the
17706 location of the info_ptr after reading all of those dies. PARENT
17707 is the parent of the die in question. */
17709 static struct die_info *
17710 read_die_and_children (const struct die_reader_specs *reader,
17711 const gdb_byte *info_ptr,
17712 const gdb_byte **new_info_ptr,
17713 struct die_info *parent)
17715 struct die_info *die;
17716 const gdb_byte *cur_ptr;
17719 cur_ptr = read_full_die_1 (reader, &die, info_ptr, &has_children, 0);
17722 *new_info_ptr = cur_ptr;
17725 store_in_ref_table (die, reader->cu);
17728 die->child = read_die_and_siblings_1 (reader, cur_ptr, new_info_ptr, die);
17732 *new_info_ptr = cur_ptr;
17735 die->sibling = NULL;
17736 die->parent = parent;
17740 /* Read a die, all of its descendents, and all of its siblings; set
17741 all of the fields of all of the dies correctly. Arguments are as
17742 in read_die_and_children. */
17744 static struct die_info *
17745 read_die_and_siblings_1 (const struct die_reader_specs *reader,
17746 const gdb_byte *info_ptr,
17747 const gdb_byte **new_info_ptr,
17748 struct die_info *parent)
17750 struct die_info *first_die, *last_sibling;
17751 const gdb_byte *cur_ptr;
17753 cur_ptr = info_ptr;
17754 first_die = last_sibling = NULL;
17758 struct die_info *die
17759 = read_die_and_children (reader, cur_ptr, &cur_ptr, parent);
17763 *new_info_ptr = cur_ptr;
17770 last_sibling->sibling = die;
17772 last_sibling = die;
17776 /* Read a die, all of its descendents, and all of its siblings; set
17777 all of the fields of all of the dies correctly. Arguments are as
17778 in read_die_and_children.
17779 This the main entry point for reading a DIE and all its children. */
17781 static struct die_info *
17782 read_die_and_siblings (const struct die_reader_specs *reader,
17783 const gdb_byte *info_ptr,
17784 const gdb_byte **new_info_ptr,
17785 struct die_info *parent)
17787 struct die_info *die = read_die_and_siblings_1 (reader, info_ptr,
17788 new_info_ptr, parent);
17790 if (dwarf_die_debug)
17792 fprintf_unfiltered (gdb_stdlog,
17793 "Read die from %s@0x%x of %s:\n",
17794 get_section_name (reader->die_section),
17795 (unsigned) (info_ptr - reader->die_section->buffer),
17796 bfd_get_filename (reader->abfd));
17797 dump_die (die, dwarf_die_debug);
17803 /* Read a die and all its attributes, leave space for NUM_EXTRA_ATTRS
17805 The caller is responsible for filling in the extra attributes
17806 and updating (*DIEP)->num_attrs.
17807 Set DIEP to point to a newly allocated die with its information,
17808 except for its child, sibling, and parent fields.
17809 Set HAS_CHILDREN to tell whether the die has children or not. */
17811 static const gdb_byte *
17812 read_full_die_1 (const struct die_reader_specs *reader,
17813 struct die_info **diep, const gdb_byte *info_ptr,
17814 int *has_children, int num_extra_attrs)
17816 unsigned int abbrev_number, bytes_read, i;
17817 struct abbrev_info *abbrev;
17818 struct die_info *die;
17819 struct dwarf2_cu *cu = reader->cu;
17820 bfd *abfd = reader->abfd;
17822 sect_offset sect_off = (sect_offset) (info_ptr - reader->buffer);
17823 abbrev_number = read_unsigned_leb128 (abfd, info_ptr, &bytes_read);
17824 info_ptr += bytes_read;
17825 if (!abbrev_number)
17832 abbrev = abbrev_table_lookup_abbrev (cu->abbrev_table, abbrev_number);
17834 error (_("Dwarf Error: could not find abbrev number %d [in module %s]"),
17836 bfd_get_filename (abfd));
17838 die = dwarf_alloc_die (cu, abbrev->num_attrs + num_extra_attrs);
17839 die->sect_off = sect_off;
17840 die->tag = abbrev->tag;
17841 die->abbrev = abbrev_number;
17843 /* Make the result usable.
17844 The caller needs to update num_attrs after adding the extra
17846 die->num_attrs = abbrev->num_attrs;
17848 for (i = 0; i < abbrev->num_attrs; ++i)
17849 info_ptr = read_attribute (reader, &die->attrs[i], &abbrev->attrs[i],
17853 *has_children = abbrev->has_children;
17857 /* Read a die and all its attributes.
17858 Set DIEP to point to a newly allocated die with its information,
17859 except for its child, sibling, and parent fields.
17860 Set HAS_CHILDREN to tell whether the die has children or not. */
17862 static const gdb_byte *
17863 read_full_die (const struct die_reader_specs *reader,
17864 struct die_info **diep, const gdb_byte *info_ptr,
17867 const gdb_byte *result;
17869 result = read_full_die_1 (reader, diep, info_ptr, has_children, 0);
17871 if (dwarf_die_debug)
17873 fprintf_unfiltered (gdb_stdlog,
17874 "Read die from %s@0x%x of %s:\n",
17875 get_section_name (reader->die_section),
17876 (unsigned) (info_ptr - reader->die_section->buffer),
17877 bfd_get_filename (reader->abfd));
17878 dump_die (*diep, dwarf_die_debug);
17884 /* Abbreviation tables.
17886 In DWARF version 2, the description of the debugging information is
17887 stored in a separate .debug_abbrev section. Before we read any
17888 dies from a section we read in all abbreviations and install them
17889 in a hash table. */
17891 /* Allocate space for a struct abbrev_info object in ABBREV_TABLE. */
17893 static struct abbrev_info *
17894 abbrev_table_alloc_abbrev (struct abbrev_table *abbrev_table)
17896 struct abbrev_info *abbrev;
17898 abbrev = XOBNEW (&abbrev_table->abbrev_obstack, struct abbrev_info);
17899 memset (abbrev, 0, sizeof (struct abbrev_info));
17904 /* Add an abbreviation to the table. */
17907 abbrev_table_add_abbrev (struct abbrev_table *abbrev_table,
17908 unsigned int abbrev_number,
17909 struct abbrev_info *abbrev)
17911 unsigned int hash_number;
17913 hash_number = abbrev_number % ABBREV_HASH_SIZE;
17914 abbrev->next = abbrev_table->abbrevs[hash_number];
17915 abbrev_table->abbrevs[hash_number] = abbrev;
17918 /* Look up an abbrev in the table.
17919 Returns NULL if the abbrev is not found. */
17921 static struct abbrev_info *
17922 abbrev_table_lookup_abbrev (const struct abbrev_table *abbrev_table,
17923 unsigned int abbrev_number)
17925 unsigned int hash_number;
17926 struct abbrev_info *abbrev;
17928 hash_number = abbrev_number % ABBREV_HASH_SIZE;
17929 abbrev = abbrev_table->abbrevs[hash_number];
17933 if (abbrev->number == abbrev_number)
17935 abbrev = abbrev->next;
17940 /* Read in an abbrev table. */
17942 static struct abbrev_table *
17943 abbrev_table_read_table (struct dwarf2_section_info *section,
17944 sect_offset sect_off)
17946 struct objfile *objfile = dwarf2_per_objfile->objfile;
17947 bfd *abfd = get_section_bfd_owner (section);
17948 struct abbrev_table *abbrev_table;
17949 const gdb_byte *abbrev_ptr;
17950 struct abbrev_info *cur_abbrev;
17951 unsigned int abbrev_number, bytes_read, abbrev_name;
17952 unsigned int abbrev_form;
17953 struct attr_abbrev *cur_attrs;
17954 unsigned int allocated_attrs;
17956 abbrev_table = XNEW (struct abbrev_table);
17957 abbrev_table->sect_off = sect_off;
17958 obstack_init (&abbrev_table->abbrev_obstack);
17959 abbrev_table->abbrevs =
17960 XOBNEWVEC (&abbrev_table->abbrev_obstack, struct abbrev_info *,
17962 memset (abbrev_table->abbrevs, 0,
17963 ABBREV_HASH_SIZE * sizeof (struct abbrev_info *));
17965 dwarf2_read_section (objfile, section);
17966 abbrev_ptr = section->buffer + to_underlying (sect_off);
17967 abbrev_number = read_unsigned_leb128 (abfd, abbrev_ptr, &bytes_read);
17968 abbrev_ptr += bytes_read;
17970 allocated_attrs = ATTR_ALLOC_CHUNK;
17971 cur_attrs = XNEWVEC (struct attr_abbrev, allocated_attrs);
17973 /* Loop until we reach an abbrev number of 0. */
17974 while (abbrev_number)
17976 cur_abbrev = abbrev_table_alloc_abbrev (abbrev_table);
17978 /* read in abbrev header */
17979 cur_abbrev->number = abbrev_number;
17981 = (enum dwarf_tag) read_unsigned_leb128 (abfd, abbrev_ptr, &bytes_read);
17982 abbrev_ptr += bytes_read;
17983 cur_abbrev->has_children = read_1_byte (abfd, abbrev_ptr);
17986 /* now read in declarations */
17989 LONGEST implicit_const;
17991 abbrev_name = read_unsigned_leb128 (abfd, abbrev_ptr, &bytes_read);
17992 abbrev_ptr += bytes_read;
17993 abbrev_form = read_unsigned_leb128 (abfd, abbrev_ptr, &bytes_read);
17994 abbrev_ptr += bytes_read;
17995 if (abbrev_form == DW_FORM_implicit_const)
17997 implicit_const = read_signed_leb128 (abfd, abbrev_ptr,
17999 abbrev_ptr += bytes_read;
18003 /* Initialize it due to a false compiler warning. */
18004 implicit_const = -1;
18007 if (abbrev_name == 0)
18010 if (cur_abbrev->num_attrs == allocated_attrs)
18012 allocated_attrs += ATTR_ALLOC_CHUNK;
18014 = XRESIZEVEC (struct attr_abbrev, cur_attrs, allocated_attrs);
18017 cur_attrs[cur_abbrev->num_attrs].name
18018 = (enum dwarf_attribute) abbrev_name;
18019 cur_attrs[cur_abbrev->num_attrs].form
18020 = (enum dwarf_form) abbrev_form;
18021 cur_attrs[cur_abbrev->num_attrs].implicit_const = implicit_const;
18022 ++cur_abbrev->num_attrs;
18025 cur_abbrev->attrs =
18026 XOBNEWVEC (&abbrev_table->abbrev_obstack, struct attr_abbrev,
18027 cur_abbrev->num_attrs);
18028 memcpy (cur_abbrev->attrs, cur_attrs,
18029 cur_abbrev->num_attrs * sizeof (struct attr_abbrev));
18031 abbrev_table_add_abbrev (abbrev_table, abbrev_number, cur_abbrev);
18033 /* Get next abbreviation.
18034 Under Irix6 the abbreviations for a compilation unit are not
18035 always properly terminated with an abbrev number of 0.
18036 Exit loop if we encounter an abbreviation which we have
18037 already read (which means we are about to read the abbreviations
18038 for the next compile unit) or if the end of the abbreviation
18039 table is reached. */
18040 if ((unsigned int) (abbrev_ptr - section->buffer) >= section->size)
18042 abbrev_number = read_unsigned_leb128 (abfd, abbrev_ptr, &bytes_read);
18043 abbrev_ptr += bytes_read;
18044 if (abbrev_table_lookup_abbrev (abbrev_table, abbrev_number) != NULL)
18049 return abbrev_table;
18052 /* Free the resources held by ABBREV_TABLE. */
18055 abbrev_table_free (struct abbrev_table *abbrev_table)
18057 obstack_free (&abbrev_table->abbrev_obstack, NULL);
18058 xfree (abbrev_table);
18061 /* Same as abbrev_table_free but as a cleanup.
18062 We pass in a pointer to the pointer to the table so that we can
18063 set the pointer to NULL when we're done. It also simplifies
18064 build_type_psymtabs_1. */
18067 abbrev_table_free_cleanup (void *table_ptr)
18069 struct abbrev_table **abbrev_table_ptr = (struct abbrev_table **) table_ptr;
18071 if (*abbrev_table_ptr != NULL)
18072 abbrev_table_free (*abbrev_table_ptr);
18073 *abbrev_table_ptr = NULL;
18076 /* Read the abbrev table for CU from ABBREV_SECTION. */
18079 dwarf2_read_abbrevs (struct dwarf2_cu *cu,
18080 struct dwarf2_section_info *abbrev_section)
18083 abbrev_table_read_table (abbrev_section, cu->header.abbrev_sect_off);
18086 /* Release the memory used by the abbrev table for a compilation unit. */
18089 dwarf2_free_abbrev_table (void *ptr_to_cu)
18091 struct dwarf2_cu *cu = (struct dwarf2_cu *) ptr_to_cu;
18093 if (cu->abbrev_table != NULL)
18094 abbrev_table_free (cu->abbrev_table);
18095 /* Set this to NULL so that we SEGV if we try to read it later,
18096 and also because free_comp_unit verifies this is NULL. */
18097 cu->abbrev_table = NULL;
18100 /* Returns nonzero if TAG represents a type that we might generate a partial
18104 is_type_tag_for_partial (int tag)
18109 /* Some types that would be reasonable to generate partial symbols for,
18110 that we don't at present. */
18111 case DW_TAG_array_type:
18112 case DW_TAG_file_type:
18113 case DW_TAG_ptr_to_member_type:
18114 case DW_TAG_set_type:
18115 case DW_TAG_string_type:
18116 case DW_TAG_subroutine_type:
18118 case DW_TAG_base_type:
18119 case DW_TAG_class_type:
18120 case DW_TAG_interface_type:
18121 case DW_TAG_enumeration_type:
18122 case DW_TAG_structure_type:
18123 case DW_TAG_subrange_type:
18124 case DW_TAG_typedef:
18125 case DW_TAG_union_type:
18132 /* Load all DIEs that are interesting for partial symbols into memory. */
18134 static struct partial_die_info *
18135 load_partial_dies (const struct die_reader_specs *reader,
18136 const gdb_byte *info_ptr, int building_psymtab)
18138 struct dwarf2_cu *cu = reader->cu;
18139 struct objfile *objfile = cu->objfile;
18140 struct partial_die_info *part_die;
18141 struct partial_die_info *parent_die, *last_die, *first_die = NULL;
18142 struct abbrev_info *abbrev;
18143 unsigned int bytes_read;
18144 unsigned int load_all = 0;
18145 int nesting_level = 1;
18150 gdb_assert (cu->per_cu != NULL);
18151 if (cu->per_cu->load_all_dies)
18155 = htab_create_alloc_ex (cu->header.length / 12,
18159 &cu->comp_unit_obstack,
18160 hashtab_obstack_allocate,
18161 dummy_obstack_deallocate);
18163 part_die = XOBNEW (&cu->comp_unit_obstack, struct partial_die_info);
18167 abbrev = peek_die_abbrev (info_ptr, &bytes_read, cu);
18169 /* A NULL abbrev means the end of a series of children. */
18170 if (abbrev == NULL)
18172 if (--nesting_level == 0)
18174 /* PART_DIE was probably the last thing allocated on the
18175 comp_unit_obstack, so we could call obstack_free
18176 here. We don't do that because the waste is small,
18177 and will be cleaned up when we're done with this
18178 compilation unit. This way, we're also more robust
18179 against other users of the comp_unit_obstack. */
18182 info_ptr += bytes_read;
18183 last_die = parent_die;
18184 parent_die = parent_die->die_parent;
18188 /* Check for template arguments. We never save these; if
18189 they're seen, we just mark the parent, and go on our way. */
18190 if (parent_die != NULL
18191 && cu->language == language_cplus
18192 && (abbrev->tag == DW_TAG_template_type_param
18193 || abbrev->tag == DW_TAG_template_value_param))
18195 parent_die->has_template_arguments = 1;
18199 /* We don't need a partial DIE for the template argument. */
18200 info_ptr = skip_one_die (reader, info_ptr + bytes_read, abbrev);
18205 /* We only recurse into c++ subprograms looking for template arguments.
18206 Skip their other children. */
18208 && cu->language == language_cplus
18209 && parent_die != NULL
18210 && parent_die->tag == DW_TAG_subprogram)
18212 info_ptr = skip_one_die (reader, info_ptr + bytes_read, abbrev);
18216 /* Check whether this DIE is interesting enough to save. Normally
18217 we would not be interested in members here, but there may be
18218 later variables referencing them via DW_AT_specification (for
18219 static members). */
18221 && !is_type_tag_for_partial (abbrev->tag)
18222 && abbrev->tag != DW_TAG_constant
18223 && abbrev->tag != DW_TAG_enumerator
18224 && abbrev->tag != DW_TAG_subprogram
18225 && abbrev->tag != DW_TAG_lexical_block
18226 && abbrev->tag != DW_TAG_variable
18227 && abbrev->tag != DW_TAG_namespace
18228 && abbrev->tag != DW_TAG_module
18229 && abbrev->tag != DW_TAG_member
18230 && abbrev->tag != DW_TAG_imported_unit
18231 && abbrev->tag != DW_TAG_imported_declaration)
18233 /* Otherwise we skip to the next sibling, if any. */
18234 info_ptr = skip_one_die (reader, info_ptr + bytes_read, abbrev);
18238 info_ptr = read_partial_die (reader, part_die, abbrev, bytes_read,
18241 /* This two-pass algorithm for processing partial symbols has a
18242 high cost in cache pressure. Thus, handle some simple cases
18243 here which cover the majority of C partial symbols. DIEs
18244 which neither have specification tags in them, nor could have
18245 specification tags elsewhere pointing at them, can simply be
18246 processed and discarded.
18248 This segment is also optional; scan_partial_symbols and
18249 add_partial_symbol will handle these DIEs if we chain
18250 them in normally. When compilers which do not emit large
18251 quantities of duplicate debug information are more common,
18252 this code can probably be removed. */
18254 /* Any complete simple types at the top level (pretty much all
18255 of them, for a language without namespaces), can be processed
18257 if (parent_die == NULL
18258 && part_die->has_specification == 0
18259 && part_die->is_declaration == 0
18260 && ((part_die->tag == DW_TAG_typedef && !part_die->has_children)
18261 || part_die->tag == DW_TAG_base_type
18262 || part_die->tag == DW_TAG_subrange_type))
18264 if (building_psymtab && part_die->name != NULL)
18265 add_psymbol_to_list (part_die->name, strlen (part_die->name), 0,
18266 VAR_DOMAIN, LOC_TYPEDEF,
18267 &objfile->static_psymbols,
18268 0, cu->language, objfile);
18269 info_ptr = locate_pdi_sibling (reader, part_die, info_ptr);
18273 /* The exception for DW_TAG_typedef with has_children above is
18274 a workaround of GCC PR debug/47510. In the case of this complaint
18275 type_name_no_tag_or_error will error on such types later.
18277 GDB skipped children of DW_TAG_typedef by the shortcut above and then
18278 it could not find the child DIEs referenced later, this is checked
18279 above. In correct DWARF DW_TAG_typedef should have no children. */
18281 if (part_die->tag == DW_TAG_typedef && part_die->has_children)
18282 complaint (&symfile_complaints,
18283 _("DW_TAG_typedef has childen - GCC PR debug/47510 bug "
18284 "- DIE at 0x%x [in module %s]"),
18285 to_underlying (part_die->sect_off), objfile_name (objfile));
18287 /* If we're at the second level, and we're an enumerator, and
18288 our parent has no specification (meaning possibly lives in a
18289 namespace elsewhere), then we can add the partial symbol now
18290 instead of queueing it. */
18291 if (part_die->tag == DW_TAG_enumerator
18292 && parent_die != NULL
18293 && parent_die->die_parent == NULL
18294 && parent_die->tag == DW_TAG_enumeration_type
18295 && parent_die->has_specification == 0)
18297 if (part_die->name == NULL)
18298 complaint (&symfile_complaints,
18299 _("malformed enumerator DIE ignored"));
18300 else if (building_psymtab)
18301 add_psymbol_to_list (part_die->name, strlen (part_die->name), 0,
18302 VAR_DOMAIN, LOC_CONST,
18303 cu->language == language_cplus
18304 ? &objfile->global_psymbols
18305 : &objfile->static_psymbols,
18306 0, cu->language, objfile);
18308 info_ptr = locate_pdi_sibling (reader, part_die, info_ptr);
18312 /* We'll save this DIE so link it in. */
18313 part_die->die_parent = parent_die;
18314 part_die->die_sibling = NULL;
18315 part_die->die_child = NULL;
18317 if (last_die && last_die == parent_die)
18318 last_die->die_child = part_die;
18320 last_die->die_sibling = part_die;
18322 last_die = part_die;
18324 if (first_die == NULL)
18325 first_die = part_die;
18327 /* Maybe add the DIE to the hash table. Not all DIEs that we
18328 find interesting need to be in the hash table, because we
18329 also have the parent/sibling/child chains; only those that we
18330 might refer to by offset later during partial symbol reading.
18332 For now this means things that might have be the target of a
18333 DW_AT_specification, DW_AT_abstract_origin, or
18334 DW_AT_extension. DW_AT_extension will refer only to
18335 namespaces; DW_AT_abstract_origin refers to functions (and
18336 many things under the function DIE, but we do not recurse
18337 into function DIEs during partial symbol reading) and
18338 possibly variables as well; DW_AT_specification refers to
18339 declarations. Declarations ought to have the DW_AT_declaration
18340 flag. It happens that GCC forgets to put it in sometimes, but
18341 only for functions, not for types.
18343 Adding more things than necessary to the hash table is harmless
18344 except for the performance cost. Adding too few will result in
18345 wasted time in find_partial_die, when we reread the compilation
18346 unit with load_all_dies set. */
18349 || abbrev->tag == DW_TAG_constant
18350 || abbrev->tag == DW_TAG_subprogram
18351 || abbrev->tag == DW_TAG_variable
18352 || abbrev->tag == DW_TAG_namespace
18353 || part_die->is_declaration)
18357 slot = htab_find_slot_with_hash (cu->partial_dies, part_die,
18358 to_underlying (part_die->sect_off),
18363 part_die = XOBNEW (&cu->comp_unit_obstack, struct partial_die_info);
18365 /* For some DIEs we want to follow their children (if any). For C
18366 we have no reason to follow the children of structures; for other
18367 languages we have to, so that we can get at method physnames
18368 to infer fully qualified class names, for DW_AT_specification,
18369 and for C++ template arguments. For C++, we also look one level
18370 inside functions to find template arguments (if the name of the
18371 function does not already contain the template arguments).
18373 For Ada, we need to scan the children of subprograms and lexical
18374 blocks as well because Ada allows the definition of nested
18375 entities that could be interesting for the debugger, such as
18376 nested subprograms for instance. */
18377 if (last_die->has_children
18379 || last_die->tag == DW_TAG_namespace
18380 || last_die->tag == DW_TAG_module
18381 || last_die->tag == DW_TAG_enumeration_type
18382 || (cu->language == language_cplus
18383 && last_die->tag == DW_TAG_subprogram
18384 && (last_die->name == NULL
18385 || strchr (last_die->name, '<') == NULL))
18386 || (cu->language != language_c
18387 && (last_die->tag == DW_TAG_class_type
18388 || last_die->tag == DW_TAG_interface_type
18389 || last_die->tag == DW_TAG_structure_type
18390 || last_die->tag == DW_TAG_union_type))
18391 || (cu->language == language_ada
18392 && (last_die->tag == DW_TAG_subprogram
18393 || last_die->tag == DW_TAG_lexical_block))))
18396 parent_die = last_die;
18400 /* Otherwise we skip to the next sibling, if any. */
18401 info_ptr = locate_pdi_sibling (reader, last_die, info_ptr);
18403 /* Back to the top, do it again. */
18407 /* Read a minimal amount of information into the minimal die structure. */
18409 static const gdb_byte *
18410 read_partial_die (const struct die_reader_specs *reader,
18411 struct partial_die_info *part_die,
18412 struct abbrev_info *abbrev, unsigned int abbrev_len,
18413 const gdb_byte *info_ptr)
18415 struct dwarf2_cu *cu = reader->cu;
18416 struct objfile *objfile = cu->objfile;
18417 const gdb_byte *buffer = reader->buffer;
18419 struct attribute attr;
18420 int has_low_pc_attr = 0;
18421 int has_high_pc_attr = 0;
18422 int high_pc_relative = 0;
18424 memset (part_die, 0, sizeof (struct partial_die_info));
18426 part_die->sect_off = (sect_offset) (info_ptr - buffer);
18428 info_ptr += abbrev_len;
18430 if (abbrev == NULL)
18433 part_die->tag = abbrev->tag;
18434 part_die->has_children = abbrev->has_children;
18436 for (i = 0; i < abbrev->num_attrs; ++i)
18438 info_ptr = read_attribute (reader, &attr, &abbrev->attrs[i], info_ptr);
18440 /* Store the data if it is of an attribute we want to keep in a
18441 partial symbol table. */
18445 switch (part_die->tag)
18447 case DW_TAG_compile_unit:
18448 case DW_TAG_partial_unit:
18449 case DW_TAG_type_unit:
18450 /* Compilation units have a DW_AT_name that is a filename, not
18451 a source language identifier. */
18452 case DW_TAG_enumeration_type:
18453 case DW_TAG_enumerator:
18454 /* These tags always have simple identifiers already; no need
18455 to canonicalize them. */
18456 part_die->name = DW_STRING (&attr);
18460 = dwarf2_canonicalize_name (DW_STRING (&attr), cu,
18461 &objfile->per_bfd->storage_obstack);
18465 case DW_AT_linkage_name:
18466 case DW_AT_MIPS_linkage_name:
18467 /* Note that both forms of linkage name might appear. We
18468 assume they will be the same, and we only store the last
18470 if (cu->language == language_ada)
18471 part_die->name = DW_STRING (&attr);
18472 part_die->linkage_name = DW_STRING (&attr);
18475 has_low_pc_attr = 1;
18476 part_die->lowpc = attr_value_as_address (&attr);
18478 case DW_AT_high_pc:
18479 has_high_pc_attr = 1;
18480 part_die->highpc = attr_value_as_address (&attr);
18481 if (cu->header.version >= 4 && attr_form_is_constant (&attr))
18482 high_pc_relative = 1;
18484 case DW_AT_location:
18485 /* Support the .debug_loc offsets. */
18486 if (attr_form_is_block (&attr))
18488 part_die->d.locdesc = DW_BLOCK (&attr);
18490 else if (attr_form_is_section_offset (&attr))
18492 dwarf2_complex_location_expr_complaint ();
18496 dwarf2_invalid_attrib_class_complaint ("DW_AT_location",
18497 "partial symbol information");
18500 case DW_AT_external:
18501 part_die->is_external = DW_UNSND (&attr);
18503 case DW_AT_declaration:
18504 part_die->is_declaration = DW_UNSND (&attr);
18507 part_die->has_type = 1;
18509 case DW_AT_abstract_origin:
18510 case DW_AT_specification:
18511 case DW_AT_extension:
18512 part_die->has_specification = 1;
18513 part_die->spec_offset = dwarf2_get_ref_die_offset (&attr);
18514 part_die->spec_is_dwz = (attr.form == DW_FORM_GNU_ref_alt
18515 || cu->per_cu->is_dwz);
18517 case DW_AT_sibling:
18518 /* Ignore absolute siblings, they might point outside of
18519 the current compile unit. */
18520 if (attr.form == DW_FORM_ref_addr)
18521 complaint (&symfile_complaints,
18522 _("ignoring absolute DW_AT_sibling"));
18525 sect_offset off = dwarf2_get_ref_die_offset (&attr);
18526 const gdb_byte *sibling_ptr = buffer + to_underlying (off);
18528 if (sibling_ptr < info_ptr)
18529 complaint (&symfile_complaints,
18530 _("DW_AT_sibling points backwards"));
18531 else if (sibling_ptr > reader->buffer_end)
18532 dwarf2_section_buffer_overflow_complaint (reader->die_section);
18534 part_die->sibling = sibling_ptr;
18537 case DW_AT_byte_size:
18538 part_die->has_byte_size = 1;
18540 case DW_AT_const_value:
18541 part_die->has_const_value = 1;
18543 case DW_AT_calling_convention:
18544 /* DWARF doesn't provide a way to identify a program's source-level
18545 entry point. DW_AT_calling_convention attributes are only meant
18546 to describe functions' calling conventions.
18548 However, because it's a necessary piece of information in
18549 Fortran, and before DWARF 4 DW_CC_program was the only
18550 piece of debugging information whose definition refers to
18551 a 'main program' at all, several compilers marked Fortran
18552 main programs with DW_CC_program --- even when those
18553 functions use the standard calling conventions.
18555 Although DWARF now specifies a way to provide this
18556 information, we support this practice for backward
18558 if (DW_UNSND (&attr) == DW_CC_program
18559 && cu->language == language_fortran)
18560 part_die->main_subprogram = 1;
18563 if (DW_UNSND (&attr) == DW_INL_inlined
18564 || DW_UNSND (&attr) == DW_INL_declared_inlined)
18565 part_die->may_be_inlined = 1;
18569 if (part_die->tag == DW_TAG_imported_unit)
18571 part_die->d.sect_off = dwarf2_get_ref_die_offset (&attr);
18572 part_die->is_dwz = (attr.form == DW_FORM_GNU_ref_alt
18573 || cu->per_cu->is_dwz);
18577 case DW_AT_main_subprogram:
18578 part_die->main_subprogram = DW_UNSND (&attr);
18586 if (high_pc_relative)
18587 part_die->highpc += part_die->lowpc;
18589 if (has_low_pc_attr && has_high_pc_attr)
18591 /* When using the GNU linker, .gnu.linkonce. sections are used to
18592 eliminate duplicate copies of functions and vtables and such.
18593 The linker will arbitrarily choose one and discard the others.
18594 The AT_*_pc values for such functions refer to local labels in
18595 these sections. If the section from that file was discarded, the
18596 labels are not in the output, so the relocs get a value of 0.
18597 If this is a discarded function, mark the pc bounds as invalid,
18598 so that GDB will ignore it. */
18599 if (part_die->lowpc == 0 && !dwarf2_per_objfile->has_section_at_zero)
18601 struct gdbarch *gdbarch = get_objfile_arch (objfile);
18603 complaint (&symfile_complaints,
18604 _("DW_AT_low_pc %s is zero "
18605 "for DIE at 0x%x [in module %s]"),
18606 paddress (gdbarch, part_die->lowpc),
18607 to_underlying (part_die->sect_off), objfile_name (objfile));
18609 /* dwarf2_get_pc_bounds has also the strict low < high requirement. */
18610 else if (part_die->lowpc >= part_die->highpc)
18612 struct gdbarch *gdbarch = get_objfile_arch (objfile);
18614 complaint (&symfile_complaints,
18615 _("DW_AT_low_pc %s is not < DW_AT_high_pc %s "
18616 "for DIE at 0x%x [in module %s]"),
18617 paddress (gdbarch, part_die->lowpc),
18618 paddress (gdbarch, part_die->highpc),
18619 to_underlying (part_die->sect_off),
18620 objfile_name (objfile));
18623 part_die->has_pc_info = 1;
18629 /* Find a cached partial DIE at OFFSET in CU. */
18631 static struct partial_die_info *
18632 find_partial_die_in_comp_unit (sect_offset sect_off, struct dwarf2_cu *cu)
18634 struct partial_die_info *lookup_die = NULL;
18635 struct partial_die_info part_die;
18637 part_die.sect_off = sect_off;
18638 lookup_die = ((struct partial_die_info *)
18639 htab_find_with_hash (cu->partial_dies, &part_die,
18640 to_underlying (sect_off)));
18645 /* Find a partial DIE at OFFSET, which may or may not be in CU,
18646 except in the case of .debug_types DIEs which do not reference
18647 outside their CU (they do however referencing other types via
18648 DW_FORM_ref_sig8). */
18650 static struct partial_die_info *
18651 find_partial_die (sect_offset sect_off, int offset_in_dwz, struct dwarf2_cu *cu)
18653 struct objfile *objfile = cu->objfile;
18654 struct dwarf2_per_cu_data *per_cu = NULL;
18655 struct partial_die_info *pd = NULL;
18657 if (offset_in_dwz == cu->per_cu->is_dwz
18658 && offset_in_cu_p (&cu->header, sect_off))
18660 pd = find_partial_die_in_comp_unit (sect_off, cu);
18663 /* We missed recording what we needed.
18664 Load all dies and try again. */
18665 per_cu = cu->per_cu;
18669 /* TUs don't reference other CUs/TUs (except via type signatures). */
18670 if (cu->per_cu->is_debug_types)
18672 error (_("Dwarf Error: Type Unit at offset 0x%x contains"
18673 " external reference to offset 0x%x [in module %s].\n"),
18674 to_underlying (cu->header.sect_off), to_underlying (sect_off),
18675 bfd_get_filename (objfile->obfd));
18677 per_cu = dwarf2_find_containing_comp_unit (sect_off, offset_in_dwz,
18680 if (per_cu->cu == NULL || per_cu->cu->partial_dies == NULL)
18681 load_partial_comp_unit (per_cu);
18683 per_cu->cu->last_used = 0;
18684 pd = find_partial_die_in_comp_unit (sect_off, per_cu->cu);
18687 /* If we didn't find it, and not all dies have been loaded,
18688 load them all and try again. */
18690 if (pd == NULL && per_cu->load_all_dies == 0)
18692 per_cu->load_all_dies = 1;
18694 /* This is nasty. When we reread the DIEs, somewhere up the call chain
18695 THIS_CU->cu may already be in use. So we can't just free it and
18696 replace its DIEs with the ones we read in. Instead, we leave those
18697 DIEs alone (which can still be in use, e.g. in scan_partial_symbols),
18698 and clobber THIS_CU->cu->partial_dies with the hash table for the new
18700 load_partial_comp_unit (per_cu);
18702 pd = find_partial_die_in_comp_unit (sect_off, per_cu->cu);
18706 internal_error (__FILE__, __LINE__,
18707 _("could not find partial DIE 0x%x "
18708 "in cache [from module %s]\n"),
18709 to_underlying (sect_off), bfd_get_filename (objfile->obfd));
18713 /* See if we can figure out if the class lives in a namespace. We do
18714 this by looking for a member function; its demangled name will
18715 contain namespace info, if there is any. */
18718 guess_partial_die_structure_name (struct partial_die_info *struct_pdi,
18719 struct dwarf2_cu *cu)
18721 /* NOTE: carlton/2003-10-07: Getting the info this way changes
18722 what template types look like, because the demangler
18723 frequently doesn't give the same name as the debug info. We
18724 could fix this by only using the demangled name to get the
18725 prefix (but see comment in read_structure_type). */
18727 struct partial_die_info *real_pdi;
18728 struct partial_die_info *child_pdi;
18730 /* If this DIE (this DIE's specification, if any) has a parent, then
18731 we should not do this. We'll prepend the parent's fully qualified
18732 name when we create the partial symbol. */
18734 real_pdi = struct_pdi;
18735 while (real_pdi->has_specification)
18736 real_pdi = find_partial_die (real_pdi->spec_offset,
18737 real_pdi->spec_is_dwz, cu);
18739 if (real_pdi->die_parent != NULL)
18742 for (child_pdi = struct_pdi->die_child;
18744 child_pdi = child_pdi->die_sibling)
18746 if (child_pdi->tag == DW_TAG_subprogram
18747 && child_pdi->linkage_name != NULL)
18749 char *actual_class_name
18750 = language_class_name_from_physname (cu->language_defn,
18751 child_pdi->linkage_name);
18752 if (actual_class_name != NULL)
18756 obstack_copy0 (&cu->objfile->per_bfd->storage_obstack,
18758 strlen (actual_class_name)));
18759 xfree (actual_class_name);
18766 /* Adjust PART_DIE before generating a symbol for it. This function
18767 may set the is_external flag or change the DIE's name. */
18770 fixup_partial_die (struct partial_die_info *part_die,
18771 struct dwarf2_cu *cu)
18773 /* Once we've fixed up a die, there's no point in doing so again.
18774 This also avoids a memory leak if we were to call
18775 guess_partial_die_structure_name multiple times. */
18776 if (part_die->fixup_called)
18779 /* If we found a reference attribute and the DIE has no name, try
18780 to find a name in the referred to DIE. */
18782 if (part_die->name == NULL && part_die->has_specification)
18784 struct partial_die_info *spec_die;
18786 spec_die = find_partial_die (part_die->spec_offset,
18787 part_die->spec_is_dwz, cu);
18789 fixup_partial_die (spec_die, cu);
18791 if (spec_die->name)
18793 part_die->name = spec_die->name;
18795 /* Copy DW_AT_external attribute if it is set. */
18796 if (spec_die->is_external)
18797 part_die->is_external = spec_die->is_external;
18801 /* Set default names for some unnamed DIEs. */
18803 if (part_die->name == NULL && part_die->tag == DW_TAG_namespace)
18804 part_die->name = CP_ANONYMOUS_NAMESPACE_STR;
18806 /* If there is no parent die to provide a namespace, and there are
18807 children, see if we can determine the namespace from their linkage
18809 if (cu->language == language_cplus
18810 && !VEC_empty (dwarf2_section_info_def, dwarf2_per_objfile->types)
18811 && part_die->die_parent == NULL
18812 && part_die->has_children
18813 && (part_die->tag == DW_TAG_class_type
18814 || part_die->tag == DW_TAG_structure_type
18815 || part_die->tag == DW_TAG_union_type))
18816 guess_partial_die_structure_name (part_die, cu);
18818 /* GCC might emit a nameless struct or union that has a linkage
18819 name. See http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47510. */
18820 if (part_die->name == NULL
18821 && (part_die->tag == DW_TAG_class_type
18822 || part_die->tag == DW_TAG_interface_type
18823 || part_die->tag == DW_TAG_structure_type
18824 || part_die->tag == DW_TAG_union_type)
18825 && part_die->linkage_name != NULL)
18829 demangled = gdb_demangle (part_die->linkage_name, DMGL_TYPES);
18834 /* Strip any leading namespaces/classes, keep only the base name.
18835 DW_AT_name for named DIEs does not contain the prefixes. */
18836 base = strrchr (demangled, ':');
18837 if (base && base > demangled && base[-1] == ':')
18844 obstack_copy0 (&cu->objfile->per_bfd->storage_obstack,
18845 base, strlen (base)));
18850 part_die->fixup_called = 1;
18853 /* Read an attribute value described by an attribute form. */
18855 static const gdb_byte *
18856 read_attribute_value (const struct die_reader_specs *reader,
18857 struct attribute *attr, unsigned form,
18858 LONGEST implicit_const, const gdb_byte *info_ptr)
18860 struct dwarf2_cu *cu = reader->cu;
18861 struct objfile *objfile = cu->objfile;
18862 struct gdbarch *gdbarch = get_objfile_arch (objfile);
18863 bfd *abfd = reader->abfd;
18864 struct comp_unit_head *cu_header = &cu->header;
18865 unsigned int bytes_read;
18866 struct dwarf_block *blk;
18868 attr->form = (enum dwarf_form) form;
18871 case DW_FORM_ref_addr:
18872 if (cu->header.version == 2)
18873 DW_UNSND (attr) = read_address (abfd, info_ptr, cu, &bytes_read);
18875 DW_UNSND (attr) = read_offset (abfd, info_ptr,
18876 &cu->header, &bytes_read);
18877 info_ptr += bytes_read;
18879 case DW_FORM_GNU_ref_alt:
18880 DW_UNSND (attr) = read_offset (abfd, info_ptr, &cu->header, &bytes_read);
18881 info_ptr += bytes_read;
18884 DW_ADDR (attr) = read_address (abfd, info_ptr, cu, &bytes_read);
18885 DW_ADDR (attr) = gdbarch_adjust_dwarf2_addr (gdbarch, DW_ADDR (attr));
18886 info_ptr += bytes_read;
18888 case DW_FORM_block2:
18889 blk = dwarf_alloc_block (cu);
18890 blk->size = read_2_bytes (abfd, info_ptr);
18892 blk->data = read_n_bytes (abfd, info_ptr, blk->size);
18893 info_ptr += blk->size;
18894 DW_BLOCK (attr) = blk;
18896 case DW_FORM_block4:
18897 blk = dwarf_alloc_block (cu);
18898 blk->size = read_4_bytes (abfd, info_ptr);
18900 blk->data = read_n_bytes (abfd, info_ptr, blk->size);
18901 info_ptr += blk->size;
18902 DW_BLOCK (attr) = blk;
18904 case DW_FORM_data2:
18905 DW_UNSND (attr) = read_2_bytes (abfd, info_ptr);
18908 case DW_FORM_data4:
18909 DW_UNSND (attr) = read_4_bytes (abfd, info_ptr);
18912 case DW_FORM_data8:
18913 DW_UNSND (attr) = read_8_bytes (abfd, info_ptr);
18916 case DW_FORM_data16:
18917 blk = dwarf_alloc_block (cu);
18919 blk->data = read_n_bytes (abfd, info_ptr, 16);
18921 DW_BLOCK (attr) = blk;
18923 case DW_FORM_sec_offset:
18924 DW_UNSND (attr) = read_offset (abfd, info_ptr, &cu->header, &bytes_read);
18925 info_ptr += bytes_read;
18927 case DW_FORM_string:
18928 DW_STRING (attr) = read_direct_string (abfd, info_ptr, &bytes_read);
18929 DW_STRING_IS_CANONICAL (attr) = 0;
18930 info_ptr += bytes_read;
18933 if (!cu->per_cu->is_dwz)
18935 DW_STRING (attr) = read_indirect_string (abfd, info_ptr, cu_header,
18937 DW_STRING_IS_CANONICAL (attr) = 0;
18938 info_ptr += bytes_read;
18942 case DW_FORM_line_strp:
18943 if (!cu->per_cu->is_dwz)
18945 DW_STRING (attr) = read_indirect_line_string (abfd, info_ptr,
18946 cu_header, &bytes_read);
18947 DW_STRING_IS_CANONICAL (attr) = 0;
18948 info_ptr += bytes_read;
18952 case DW_FORM_GNU_strp_alt:
18954 struct dwz_file *dwz = dwarf2_get_dwz_file ();
18955 LONGEST str_offset = read_offset (abfd, info_ptr, cu_header,
18958 DW_STRING (attr) = read_indirect_string_from_dwz (dwz, str_offset);
18959 DW_STRING_IS_CANONICAL (attr) = 0;
18960 info_ptr += bytes_read;
18963 case DW_FORM_exprloc:
18964 case DW_FORM_block:
18965 blk = dwarf_alloc_block (cu);
18966 blk->size = read_unsigned_leb128 (abfd, info_ptr, &bytes_read);
18967 info_ptr += bytes_read;
18968 blk->data = read_n_bytes (abfd, info_ptr, blk->size);
18969 info_ptr += blk->size;
18970 DW_BLOCK (attr) = blk;
18972 case DW_FORM_block1:
18973 blk = dwarf_alloc_block (cu);
18974 blk->size = read_1_byte (abfd, info_ptr);
18976 blk->data = read_n_bytes (abfd, info_ptr, blk->size);
18977 info_ptr += blk->size;
18978 DW_BLOCK (attr) = blk;
18980 case DW_FORM_data1:
18981 DW_UNSND (attr) = read_1_byte (abfd, info_ptr);
18985 DW_UNSND (attr) = read_1_byte (abfd, info_ptr);
18988 case DW_FORM_flag_present:
18989 DW_UNSND (attr) = 1;
18991 case DW_FORM_sdata:
18992 DW_SND (attr) = read_signed_leb128 (abfd, info_ptr, &bytes_read);
18993 info_ptr += bytes_read;
18995 case DW_FORM_udata:
18996 DW_UNSND (attr) = read_unsigned_leb128 (abfd, info_ptr, &bytes_read);
18997 info_ptr += bytes_read;
19000 DW_UNSND (attr) = (to_underlying (cu->header.sect_off)
19001 + read_1_byte (abfd, info_ptr));
19005 DW_UNSND (attr) = (to_underlying (cu->header.sect_off)
19006 + read_2_bytes (abfd, info_ptr));
19010 DW_UNSND (attr) = (to_underlying (cu->header.sect_off)
19011 + read_4_bytes (abfd, info_ptr));
19015 DW_UNSND (attr) = (to_underlying (cu->header.sect_off)
19016 + read_8_bytes (abfd, info_ptr));
19019 case DW_FORM_ref_sig8:
19020 DW_SIGNATURE (attr) = read_8_bytes (abfd, info_ptr);
19023 case DW_FORM_ref_udata:
19024 DW_UNSND (attr) = (to_underlying (cu->header.sect_off)
19025 + read_unsigned_leb128 (abfd, info_ptr, &bytes_read));
19026 info_ptr += bytes_read;
19028 case DW_FORM_indirect:
19029 form = read_unsigned_leb128 (abfd, info_ptr, &bytes_read);
19030 info_ptr += bytes_read;
19031 if (form == DW_FORM_implicit_const)
19033 implicit_const = read_signed_leb128 (abfd, info_ptr, &bytes_read);
19034 info_ptr += bytes_read;
19036 info_ptr = read_attribute_value (reader, attr, form, implicit_const,
19039 case DW_FORM_implicit_const:
19040 DW_SND (attr) = implicit_const;
19042 case DW_FORM_GNU_addr_index:
19043 if (reader->dwo_file == NULL)
19045 /* For now flag a hard error.
19046 Later we can turn this into a complaint. */
19047 error (_("Dwarf Error: %s found in non-DWO CU [in module %s]"),
19048 dwarf_form_name (form),
19049 bfd_get_filename (abfd));
19051 DW_ADDR (attr) = read_addr_index_from_leb128 (cu, info_ptr, &bytes_read);
19052 info_ptr += bytes_read;
19054 case DW_FORM_GNU_str_index:
19055 if (reader->dwo_file == NULL)
19057 /* For now flag a hard error.
19058 Later we can turn this into a complaint if warranted. */
19059 error (_("Dwarf Error: %s found in non-DWO CU [in module %s]"),
19060 dwarf_form_name (form),
19061 bfd_get_filename (abfd));
19064 ULONGEST str_index =
19065 read_unsigned_leb128 (abfd, info_ptr, &bytes_read);
19067 DW_STRING (attr) = read_str_index (reader, str_index);
19068 DW_STRING_IS_CANONICAL (attr) = 0;
19069 info_ptr += bytes_read;
19073 error (_("Dwarf Error: Cannot handle %s in DWARF reader [in module %s]"),
19074 dwarf_form_name (form),
19075 bfd_get_filename (abfd));
19079 if (cu->per_cu->is_dwz && attr_form_is_ref (attr))
19080 attr->form = DW_FORM_GNU_ref_alt;
19082 /* We have seen instances where the compiler tried to emit a byte
19083 size attribute of -1 which ended up being encoded as an unsigned
19084 0xffffffff. Although 0xffffffff is technically a valid size value,
19085 an object of this size seems pretty unlikely so we can relatively
19086 safely treat these cases as if the size attribute was invalid and
19087 treat them as zero by default. */
19088 if (attr->name == DW_AT_byte_size
19089 && form == DW_FORM_data4
19090 && DW_UNSND (attr) >= 0xffffffff)
19093 (&symfile_complaints,
19094 _("Suspicious DW_AT_byte_size value treated as zero instead of %s"),
19095 hex_string (DW_UNSND (attr)));
19096 DW_UNSND (attr) = 0;
19102 /* Read an attribute described by an abbreviated attribute. */
19104 static const gdb_byte *
19105 read_attribute (const struct die_reader_specs *reader,
19106 struct attribute *attr, struct attr_abbrev *abbrev,
19107 const gdb_byte *info_ptr)
19109 attr->name = abbrev->name;
19110 return read_attribute_value (reader, attr, abbrev->form,
19111 abbrev->implicit_const, info_ptr);
19114 /* Read dwarf information from a buffer. */
19116 static unsigned int
19117 read_1_byte (bfd *abfd, const gdb_byte *buf)
19119 return bfd_get_8 (abfd, buf);
19123 read_1_signed_byte (bfd *abfd, const gdb_byte *buf)
19125 return bfd_get_signed_8 (abfd, buf);
19128 static unsigned int
19129 read_2_bytes (bfd *abfd, const gdb_byte *buf)
19131 return bfd_get_16 (abfd, buf);
19135 read_2_signed_bytes (bfd *abfd, const gdb_byte *buf)
19137 return bfd_get_signed_16 (abfd, buf);
19140 static unsigned int
19141 read_4_bytes (bfd *abfd, const gdb_byte *buf)
19143 return bfd_get_32 (abfd, buf);
19147 read_4_signed_bytes (bfd *abfd, const gdb_byte *buf)
19149 return bfd_get_signed_32 (abfd, buf);
19153 read_8_bytes (bfd *abfd, const gdb_byte *buf)
19155 return bfd_get_64 (abfd, buf);
19159 read_address (bfd *abfd, const gdb_byte *buf, struct dwarf2_cu *cu,
19160 unsigned int *bytes_read)
19162 struct comp_unit_head *cu_header = &cu->header;
19163 CORE_ADDR retval = 0;
19165 if (cu_header->signed_addr_p)
19167 switch (cu_header->addr_size)
19170 retval = bfd_get_signed_16 (abfd, buf);
19173 retval = bfd_get_signed_32 (abfd, buf);
19176 retval = bfd_get_signed_64 (abfd, buf);
19179 internal_error (__FILE__, __LINE__,
19180 _("read_address: bad switch, signed [in module %s]"),
19181 bfd_get_filename (abfd));
19186 switch (cu_header->addr_size)
19189 retval = bfd_get_16 (abfd, buf);
19192 retval = bfd_get_32 (abfd, buf);
19195 retval = bfd_get_64 (abfd, buf);
19198 internal_error (__FILE__, __LINE__,
19199 _("read_address: bad switch, "
19200 "unsigned [in module %s]"),
19201 bfd_get_filename (abfd));
19205 *bytes_read = cu_header->addr_size;
19209 /* Read the initial length from a section. The (draft) DWARF 3
19210 specification allows the initial length to take up either 4 bytes
19211 or 12 bytes. If the first 4 bytes are 0xffffffff, then the next 8
19212 bytes describe the length and all offsets will be 8 bytes in length
19215 An older, non-standard 64-bit format is also handled by this
19216 function. The older format in question stores the initial length
19217 as an 8-byte quantity without an escape value. Lengths greater
19218 than 2^32 aren't very common which means that the initial 4 bytes
19219 is almost always zero. Since a length value of zero doesn't make
19220 sense for the 32-bit format, this initial zero can be considered to
19221 be an escape value which indicates the presence of the older 64-bit
19222 format. As written, the code can't detect (old format) lengths
19223 greater than 4GB. If it becomes necessary to handle lengths
19224 somewhat larger than 4GB, we could allow other small values (such
19225 as the non-sensical values of 1, 2, and 3) to also be used as
19226 escape values indicating the presence of the old format.
19228 The value returned via bytes_read should be used to increment the
19229 relevant pointer after calling read_initial_length().
19231 [ Note: read_initial_length() and read_offset() are based on the
19232 document entitled "DWARF Debugging Information Format", revision
19233 3, draft 8, dated November 19, 2001. This document was obtained
19236 http://reality.sgiweb.org/davea/dwarf3-draft8-011125.pdf
19238 This document is only a draft and is subject to change. (So beware.)
19240 Details regarding the older, non-standard 64-bit format were
19241 determined empirically by examining 64-bit ELF files produced by
19242 the SGI toolchain on an IRIX 6.5 machine.
19244 - Kevin, July 16, 2002
19248 read_initial_length (bfd *abfd, const gdb_byte *buf, unsigned int *bytes_read)
19250 LONGEST length = bfd_get_32 (abfd, buf);
19252 if (length == 0xffffffff)
19254 length = bfd_get_64 (abfd, buf + 4);
19257 else if (length == 0)
19259 /* Handle the (non-standard) 64-bit DWARF2 format used by IRIX. */
19260 length = bfd_get_64 (abfd, buf);
19271 /* Cover function for read_initial_length.
19272 Returns the length of the object at BUF, and stores the size of the
19273 initial length in *BYTES_READ and stores the size that offsets will be in
19275 If the initial length size is not equivalent to that specified in
19276 CU_HEADER then issue a complaint.
19277 This is useful when reading non-comp-unit headers. */
19280 read_checked_initial_length_and_offset (bfd *abfd, const gdb_byte *buf,
19281 const struct comp_unit_head *cu_header,
19282 unsigned int *bytes_read,
19283 unsigned int *offset_size)
19285 LONGEST length = read_initial_length (abfd, buf, bytes_read);
19287 gdb_assert (cu_header->initial_length_size == 4
19288 || cu_header->initial_length_size == 8
19289 || cu_header->initial_length_size == 12);
19291 if (cu_header->initial_length_size != *bytes_read)
19292 complaint (&symfile_complaints,
19293 _("intermixed 32-bit and 64-bit DWARF sections"));
19295 *offset_size = (*bytes_read == 4) ? 4 : 8;
19299 /* Read an offset from the data stream. The size of the offset is
19300 given by cu_header->offset_size. */
19303 read_offset (bfd *abfd, const gdb_byte *buf,
19304 const struct comp_unit_head *cu_header,
19305 unsigned int *bytes_read)
19307 LONGEST offset = read_offset_1 (abfd, buf, cu_header->offset_size);
19309 *bytes_read = cu_header->offset_size;
19313 /* Read an offset from the data stream. */
19316 read_offset_1 (bfd *abfd, const gdb_byte *buf, unsigned int offset_size)
19318 LONGEST retval = 0;
19320 switch (offset_size)
19323 retval = bfd_get_32 (abfd, buf);
19326 retval = bfd_get_64 (abfd, buf);
19329 internal_error (__FILE__, __LINE__,
19330 _("read_offset_1: bad switch [in module %s]"),
19331 bfd_get_filename (abfd));
19337 static const gdb_byte *
19338 read_n_bytes (bfd *abfd, const gdb_byte *buf, unsigned int size)
19340 /* If the size of a host char is 8 bits, we can return a pointer
19341 to the buffer, otherwise we have to copy the data to a buffer
19342 allocated on the temporary obstack. */
19343 gdb_assert (HOST_CHAR_BIT == 8);
19347 static const char *
19348 read_direct_string (bfd *abfd, const gdb_byte *buf,
19349 unsigned int *bytes_read_ptr)
19351 /* If the size of a host char is 8 bits, we can return a pointer
19352 to the string, otherwise we have to copy the string to a buffer
19353 allocated on the temporary obstack. */
19354 gdb_assert (HOST_CHAR_BIT == 8);
19357 *bytes_read_ptr = 1;
19360 *bytes_read_ptr = strlen ((const char *) buf) + 1;
19361 return (const char *) buf;
19364 /* Return pointer to string at section SECT offset STR_OFFSET with error
19365 reporting strings FORM_NAME and SECT_NAME. */
19367 static const char *
19368 read_indirect_string_at_offset_from (bfd *abfd, LONGEST str_offset,
19369 struct dwarf2_section_info *sect,
19370 const char *form_name,
19371 const char *sect_name)
19373 dwarf2_read_section (dwarf2_per_objfile->objfile, sect);
19374 if (sect->buffer == NULL)
19375 error (_("%s used without %s section [in module %s]"),
19376 form_name, sect_name, bfd_get_filename (abfd));
19377 if (str_offset >= sect->size)
19378 error (_("%s pointing outside of %s section [in module %s]"),
19379 form_name, sect_name, bfd_get_filename (abfd));
19380 gdb_assert (HOST_CHAR_BIT == 8);
19381 if (sect->buffer[str_offset] == '\0')
19383 return (const char *) (sect->buffer + str_offset);
19386 /* Return pointer to string at .debug_str offset STR_OFFSET. */
19388 static const char *
19389 read_indirect_string_at_offset (bfd *abfd, LONGEST str_offset)
19391 return read_indirect_string_at_offset_from (abfd, str_offset,
19392 &dwarf2_per_objfile->str,
19393 "DW_FORM_strp", ".debug_str");
19396 /* Return pointer to string at .debug_line_str offset STR_OFFSET. */
19398 static const char *
19399 read_indirect_line_string_at_offset (bfd *abfd, LONGEST str_offset)
19401 return read_indirect_string_at_offset_from (abfd, str_offset,
19402 &dwarf2_per_objfile->line_str,
19403 "DW_FORM_line_strp",
19404 ".debug_line_str");
19407 /* Read a string at offset STR_OFFSET in the .debug_str section from
19408 the .dwz file DWZ. Throw an error if the offset is too large. If
19409 the string consists of a single NUL byte, return NULL; otherwise
19410 return a pointer to the string. */
19412 static const char *
19413 read_indirect_string_from_dwz (struct dwz_file *dwz, LONGEST str_offset)
19415 dwarf2_read_section (dwarf2_per_objfile->objfile, &dwz->str);
19417 if (dwz->str.buffer == NULL)
19418 error (_("DW_FORM_GNU_strp_alt used without .debug_str "
19419 "section [in module %s]"),
19420 bfd_get_filename (dwz->dwz_bfd));
19421 if (str_offset >= dwz->str.size)
19422 error (_("DW_FORM_GNU_strp_alt pointing outside of "
19423 ".debug_str section [in module %s]"),
19424 bfd_get_filename (dwz->dwz_bfd));
19425 gdb_assert (HOST_CHAR_BIT == 8);
19426 if (dwz->str.buffer[str_offset] == '\0')
19428 return (const char *) (dwz->str.buffer + str_offset);
19431 /* Return pointer to string at .debug_str offset as read from BUF.
19432 BUF is assumed to be in a compilation unit described by CU_HEADER.
19433 Return *BYTES_READ_PTR count of bytes read from BUF. */
19435 static const char *
19436 read_indirect_string (bfd *abfd, const gdb_byte *buf,
19437 const struct comp_unit_head *cu_header,
19438 unsigned int *bytes_read_ptr)
19440 LONGEST str_offset = read_offset (abfd, buf, cu_header, bytes_read_ptr);
19442 return read_indirect_string_at_offset (abfd, str_offset);
19445 /* Return pointer to string at .debug_line_str offset as read from BUF.
19446 BUF is assumed to be in a compilation unit described by CU_HEADER.
19447 Return *BYTES_READ_PTR count of bytes read from BUF. */
19449 static const char *
19450 read_indirect_line_string (bfd *abfd, const gdb_byte *buf,
19451 const struct comp_unit_head *cu_header,
19452 unsigned int *bytes_read_ptr)
19454 LONGEST str_offset = read_offset (abfd, buf, cu_header, bytes_read_ptr);
19456 return read_indirect_line_string_at_offset (abfd, str_offset);
19460 read_unsigned_leb128 (bfd *abfd, const gdb_byte *buf,
19461 unsigned int *bytes_read_ptr)
19464 unsigned int num_read;
19466 unsigned char byte;
19473 byte = bfd_get_8 (abfd, buf);
19476 result |= ((ULONGEST) (byte & 127) << shift);
19477 if ((byte & 128) == 0)
19483 *bytes_read_ptr = num_read;
19488 read_signed_leb128 (bfd *abfd, const gdb_byte *buf,
19489 unsigned int *bytes_read_ptr)
19492 int shift, num_read;
19493 unsigned char byte;
19500 byte = bfd_get_8 (abfd, buf);
19503 result |= ((LONGEST) (byte & 127) << shift);
19505 if ((byte & 128) == 0)
19510 if ((shift < 8 * sizeof (result)) && (byte & 0x40))
19511 result |= -(((LONGEST) 1) << shift);
19512 *bytes_read_ptr = num_read;
19516 /* Given index ADDR_INDEX in .debug_addr, fetch the value.
19517 ADDR_BASE is the DW_AT_GNU_addr_base attribute or zero.
19518 ADDR_SIZE is the size of addresses from the CU header. */
19521 read_addr_index_1 (unsigned int addr_index, ULONGEST addr_base, int addr_size)
19523 struct objfile *objfile = dwarf2_per_objfile->objfile;
19524 bfd *abfd = objfile->obfd;
19525 const gdb_byte *info_ptr;
19527 dwarf2_read_section (objfile, &dwarf2_per_objfile->addr);
19528 if (dwarf2_per_objfile->addr.buffer == NULL)
19529 error (_("DW_FORM_addr_index used without .debug_addr section [in module %s]"),
19530 objfile_name (objfile));
19531 if (addr_base + addr_index * addr_size >= dwarf2_per_objfile->addr.size)
19532 error (_("DW_FORM_addr_index pointing outside of "
19533 ".debug_addr section [in module %s]"),
19534 objfile_name (objfile));
19535 info_ptr = (dwarf2_per_objfile->addr.buffer
19536 + addr_base + addr_index * addr_size);
19537 if (addr_size == 4)
19538 return bfd_get_32 (abfd, info_ptr);
19540 return bfd_get_64 (abfd, info_ptr);
19543 /* Given index ADDR_INDEX in .debug_addr, fetch the value. */
19546 read_addr_index (struct dwarf2_cu *cu, unsigned int addr_index)
19548 return read_addr_index_1 (addr_index, cu->addr_base, cu->header.addr_size);
19551 /* Given a pointer to an leb128 value, fetch the value from .debug_addr. */
19554 read_addr_index_from_leb128 (struct dwarf2_cu *cu, const gdb_byte *info_ptr,
19555 unsigned int *bytes_read)
19557 bfd *abfd = cu->objfile->obfd;
19558 unsigned int addr_index = read_unsigned_leb128 (abfd, info_ptr, bytes_read);
19560 return read_addr_index (cu, addr_index);
19563 /* Data structure to pass results from dwarf2_read_addr_index_reader
19564 back to dwarf2_read_addr_index. */
19566 struct dwarf2_read_addr_index_data
19568 ULONGEST addr_base;
19572 /* die_reader_func for dwarf2_read_addr_index. */
19575 dwarf2_read_addr_index_reader (const struct die_reader_specs *reader,
19576 const gdb_byte *info_ptr,
19577 struct die_info *comp_unit_die,
19581 struct dwarf2_cu *cu = reader->cu;
19582 struct dwarf2_read_addr_index_data *aidata =
19583 (struct dwarf2_read_addr_index_data *) data;
19585 aidata->addr_base = cu->addr_base;
19586 aidata->addr_size = cu->header.addr_size;
19589 /* Given an index in .debug_addr, fetch the value.
19590 NOTE: This can be called during dwarf expression evaluation,
19591 long after the debug information has been read, and thus per_cu->cu
19592 may no longer exist. */
19595 dwarf2_read_addr_index (struct dwarf2_per_cu_data *per_cu,
19596 unsigned int addr_index)
19598 struct objfile *objfile = per_cu->objfile;
19599 struct dwarf2_cu *cu = per_cu->cu;
19600 ULONGEST addr_base;
19603 /* This is intended to be called from outside this file. */
19604 dw2_setup (objfile);
19606 /* We need addr_base and addr_size.
19607 If we don't have PER_CU->cu, we have to get it.
19608 Nasty, but the alternative is storing the needed info in PER_CU,
19609 which at this point doesn't seem justified: it's not clear how frequently
19610 it would get used and it would increase the size of every PER_CU.
19611 Entry points like dwarf2_per_cu_addr_size do a similar thing
19612 so we're not in uncharted territory here.
19613 Alas we need to be a bit more complicated as addr_base is contained
19616 We don't need to read the entire CU(/TU).
19617 We just need the header and top level die.
19619 IWBN to use the aging mechanism to let us lazily later discard the CU.
19620 For now we skip this optimization. */
19624 addr_base = cu->addr_base;
19625 addr_size = cu->header.addr_size;
19629 struct dwarf2_read_addr_index_data aidata;
19631 /* Note: We can't use init_cutu_and_read_dies_simple here,
19632 we need addr_base. */
19633 init_cutu_and_read_dies (per_cu, NULL, 0, 0,
19634 dwarf2_read_addr_index_reader, &aidata);
19635 addr_base = aidata.addr_base;
19636 addr_size = aidata.addr_size;
19639 return read_addr_index_1 (addr_index, addr_base, addr_size);
19642 /* Given a DW_FORM_GNU_str_index, fetch the string.
19643 This is only used by the Fission support. */
19645 static const char *
19646 read_str_index (const struct die_reader_specs *reader, ULONGEST str_index)
19648 struct objfile *objfile = dwarf2_per_objfile->objfile;
19649 const char *objf_name = objfile_name (objfile);
19650 bfd *abfd = objfile->obfd;
19651 struct dwarf2_cu *cu = reader->cu;
19652 struct dwarf2_section_info *str_section = &reader->dwo_file->sections.str;
19653 struct dwarf2_section_info *str_offsets_section =
19654 &reader->dwo_file->sections.str_offsets;
19655 const gdb_byte *info_ptr;
19656 ULONGEST str_offset;
19657 static const char form_name[] = "DW_FORM_GNU_str_index";
19659 dwarf2_read_section (objfile, str_section);
19660 dwarf2_read_section (objfile, str_offsets_section);
19661 if (str_section->buffer == NULL)
19662 error (_("%s used without .debug_str.dwo section"
19663 " in CU at offset 0x%x [in module %s]"),
19664 form_name, to_underlying (cu->header.sect_off), objf_name);
19665 if (str_offsets_section->buffer == NULL)
19666 error (_("%s used without .debug_str_offsets.dwo section"
19667 " in CU at offset 0x%x [in module %s]"),
19668 form_name, to_underlying (cu->header.sect_off), objf_name);
19669 if (str_index * cu->header.offset_size >= str_offsets_section->size)
19670 error (_("%s pointing outside of .debug_str_offsets.dwo"
19671 " section in CU at offset 0x%x [in module %s]"),
19672 form_name, to_underlying (cu->header.sect_off), objf_name);
19673 info_ptr = (str_offsets_section->buffer
19674 + str_index * cu->header.offset_size);
19675 if (cu->header.offset_size == 4)
19676 str_offset = bfd_get_32 (abfd, info_ptr);
19678 str_offset = bfd_get_64 (abfd, info_ptr);
19679 if (str_offset >= str_section->size)
19680 error (_("Offset from %s pointing outside of"
19681 " .debug_str.dwo section in CU at offset 0x%x [in module %s]"),
19682 form_name, to_underlying (cu->header.sect_off), objf_name);
19683 return (const char *) (str_section->buffer + str_offset);
19686 /* Return the length of an LEB128 number in BUF. */
19689 leb128_size (const gdb_byte *buf)
19691 const gdb_byte *begin = buf;
19697 if ((byte & 128) == 0)
19698 return buf - begin;
19703 set_cu_language (unsigned int lang, struct dwarf2_cu *cu)
19712 cu->language = language_c;
19715 case DW_LANG_C_plus_plus:
19716 case DW_LANG_C_plus_plus_11:
19717 case DW_LANG_C_plus_plus_14:
19718 cu->language = language_cplus;
19721 cu->language = language_d;
19723 case DW_LANG_Fortran77:
19724 case DW_LANG_Fortran90:
19725 case DW_LANG_Fortran95:
19726 case DW_LANG_Fortran03:
19727 case DW_LANG_Fortran08:
19728 cu->language = language_fortran;
19731 cu->language = language_go;
19733 case DW_LANG_Mips_Assembler:
19734 cu->language = language_asm;
19736 case DW_LANG_Ada83:
19737 case DW_LANG_Ada95:
19738 cu->language = language_ada;
19740 case DW_LANG_Modula2:
19741 cu->language = language_m2;
19743 case DW_LANG_Pascal83:
19744 cu->language = language_pascal;
19747 cu->language = language_objc;
19750 case DW_LANG_Rust_old:
19751 cu->language = language_rust;
19753 case DW_LANG_Cobol74:
19754 case DW_LANG_Cobol85:
19756 cu->language = language_minimal;
19759 cu->language_defn = language_def (cu->language);
19762 /* Return the named attribute or NULL if not there. */
19764 static struct attribute *
19765 dwarf2_attr (struct die_info *die, unsigned int name, struct dwarf2_cu *cu)
19770 struct attribute *spec = NULL;
19772 for (i = 0; i < die->num_attrs; ++i)
19774 if (die->attrs[i].name == name)
19775 return &die->attrs[i];
19776 if (die->attrs[i].name == DW_AT_specification
19777 || die->attrs[i].name == DW_AT_abstract_origin)
19778 spec = &die->attrs[i];
19784 die = follow_die_ref (die, spec, &cu);
19790 /* Return the named attribute or NULL if not there,
19791 but do not follow DW_AT_specification, etc.
19792 This is for use in contexts where we're reading .debug_types dies.
19793 Following DW_AT_specification, DW_AT_abstract_origin will take us
19794 back up the chain, and we want to go down. */
19796 static struct attribute *
19797 dwarf2_attr_no_follow (struct die_info *die, unsigned int name)
19801 for (i = 0; i < die->num_attrs; ++i)
19802 if (die->attrs[i].name == name)
19803 return &die->attrs[i];
19808 /* Return the string associated with a string-typed attribute, or NULL if it
19809 is either not found or is of an incorrect type. */
19811 static const char *
19812 dwarf2_string_attr (struct die_info *die, unsigned int name, struct dwarf2_cu *cu)
19814 struct attribute *attr;
19815 const char *str = NULL;
19817 attr = dwarf2_attr (die, name, cu);
19821 if (attr->form == DW_FORM_strp || attr->form == DW_FORM_line_strp
19822 || attr->form == DW_FORM_string
19823 || attr->form == DW_FORM_GNU_str_index
19824 || attr->form == DW_FORM_GNU_strp_alt)
19825 str = DW_STRING (attr);
19827 complaint (&symfile_complaints,
19828 _("string type expected for attribute %s for "
19829 "DIE at 0x%x in module %s"),
19830 dwarf_attr_name (name), to_underlying (die->sect_off),
19831 objfile_name (cu->objfile));
19837 /* Return non-zero iff the attribute NAME is defined for the given DIE,
19838 and holds a non-zero value. This function should only be used for
19839 DW_FORM_flag or DW_FORM_flag_present attributes. */
19842 dwarf2_flag_true_p (struct die_info *die, unsigned name, struct dwarf2_cu *cu)
19844 struct attribute *attr = dwarf2_attr (die, name, cu);
19846 return (attr && DW_UNSND (attr));
19850 die_is_declaration (struct die_info *die, struct dwarf2_cu *cu)
19852 /* A DIE is a declaration if it has a DW_AT_declaration attribute
19853 which value is non-zero. However, we have to be careful with
19854 DIEs having a DW_AT_specification attribute, because dwarf2_attr()
19855 (via dwarf2_flag_true_p) follows this attribute. So we may
19856 end up accidently finding a declaration attribute that belongs
19857 to a different DIE referenced by the specification attribute,
19858 even though the given DIE does not have a declaration attribute. */
19859 return (dwarf2_flag_true_p (die, DW_AT_declaration, cu)
19860 && dwarf2_attr (die, DW_AT_specification, cu) == NULL);
19863 /* Return the die giving the specification for DIE, if there is
19864 one. *SPEC_CU is the CU containing DIE on input, and the CU
19865 containing the return value on output. If there is no
19866 specification, but there is an abstract origin, that is
19869 static struct die_info *
19870 die_specification (struct die_info *die, struct dwarf2_cu **spec_cu)
19872 struct attribute *spec_attr = dwarf2_attr (die, DW_AT_specification,
19875 if (spec_attr == NULL)
19876 spec_attr = dwarf2_attr (die, DW_AT_abstract_origin, *spec_cu);
19878 if (spec_attr == NULL)
19881 return follow_die_ref (die, spec_attr, spec_cu);
19884 /* Stub for free_line_header to match void * callback types. */
19887 free_line_header_voidp (void *arg)
19889 struct line_header *lh = (struct line_header *) arg;
19895 line_header::add_include_dir (const char *include_dir)
19897 if (dwarf_line_debug >= 2)
19898 fprintf_unfiltered (gdb_stdlog, "Adding dir %zu: %s\n",
19899 include_dirs.size () + 1, include_dir);
19901 include_dirs.push_back (include_dir);
19905 line_header::add_file_name (const char *name,
19907 unsigned int mod_time,
19908 unsigned int length)
19910 if (dwarf_line_debug >= 2)
19911 fprintf_unfiltered (gdb_stdlog, "Adding file %u: %s\n",
19912 (unsigned) file_names.size () + 1, name);
19914 file_names.emplace_back (name, d_index, mod_time, length);
19917 /* A convenience function to find the proper .debug_line section for a CU. */
19919 static struct dwarf2_section_info *
19920 get_debug_line_section (struct dwarf2_cu *cu)
19922 struct dwarf2_section_info *section;
19924 /* For TUs in DWO files, the DW_AT_stmt_list attribute lives in the
19926 if (cu->dwo_unit && cu->per_cu->is_debug_types)
19927 section = &cu->dwo_unit->dwo_file->sections.line;
19928 else if (cu->per_cu->is_dwz)
19930 struct dwz_file *dwz = dwarf2_get_dwz_file ();
19932 section = &dwz->line;
19935 section = &dwarf2_per_objfile->line;
19940 /* Read directory or file name entry format, starting with byte of
19941 format count entries, ULEB128 pairs of entry formats, ULEB128 of
19942 entries count and the entries themselves in the described entry
19946 read_formatted_entries (bfd *abfd, const gdb_byte **bufp,
19947 struct line_header *lh,
19948 const struct comp_unit_head *cu_header,
19949 void (*callback) (struct line_header *lh,
19952 unsigned int mod_time,
19953 unsigned int length))
19955 gdb_byte format_count, formati;
19956 ULONGEST data_count, datai;
19957 const gdb_byte *buf = *bufp;
19958 const gdb_byte *format_header_data;
19959 unsigned int bytes_read;
19961 format_count = read_1_byte (abfd, buf);
19963 format_header_data = buf;
19964 for (formati = 0; formati < format_count; formati++)
19966 read_unsigned_leb128 (abfd, buf, &bytes_read);
19968 read_unsigned_leb128 (abfd, buf, &bytes_read);
19972 data_count = read_unsigned_leb128 (abfd, buf, &bytes_read);
19974 for (datai = 0; datai < data_count; datai++)
19976 const gdb_byte *format = format_header_data;
19977 struct file_entry fe;
19979 for (formati = 0; formati < format_count; formati++)
19981 ULONGEST content_type = read_unsigned_leb128 (abfd, format, &bytes_read);
19982 format += bytes_read;
19984 ULONGEST form = read_unsigned_leb128 (abfd, format, &bytes_read);
19985 format += bytes_read;
19987 gdb::optional<const char *> string;
19988 gdb::optional<unsigned int> uint;
19992 case DW_FORM_string:
19993 string.emplace (read_direct_string (abfd, buf, &bytes_read));
19997 case DW_FORM_line_strp:
19998 string.emplace (read_indirect_line_string (abfd, buf,
20004 case DW_FORM_data1:
20005 uint.emplace (read_1_byte (abfd, buf));
20009 case DW_FORM_data2:
20010 uint.emplace (read_2_bytes (abfd, buf));
20014 case DW_FORM_data4:
20015 uint.emplace (read_4_bytes (abfd, buf));
20019 case DW_FORM_data8:
20020 uint.emplace (read_8_bytes (abfd, buf));
20024 case DW_FORM_udata:
20025 uint.emplace (read_unsigned_leb128 (abfd, buf, &bytes_read));
20029 case DW_FORM_block:
20030 /* It is valid only for DW_LNCT_timestamp which is ignored by
20035 switch (content_type)
20038 if (string.has_value ())
20041 case DW_LNCT_directory_index:
20042 if (uint.has_value ())
20043 fe.d_index = (dir_index) *uint;
20045 case DW_LNCT_timestamp:
20046 if (uint.has_value ())
20047 fe.mod_time = *uint;
20050 if (uint.has_value ())
20056 complaint (&symfile_complaints,
20057 _("Unknown format content type %s"),
20058 pulongest (content_type));
20062 callback (lh, fe.name, fe.d_index, fe.mod_time, fe.length);
20068 /* Read the statement program header starting at OFFSET in
20069 .debug_line, or .debug_line.dwo. Return a pointer
20070 to a struct line_header, allocated using xmalloc.
20071 Returns NULL if there is a problem reading the header, e.g., if it
20072 has a version we don't understand.
20074 NOTE: the strings in the include directory and file name tables of
20075 the returned object point into the dwarf line section buffer,
20076 and must not be freed. */
20078 static line_header_up
20079 dwarf_decode_line_header (sect_offset sect_off, struct dwarf2_cu *cu)
20081 const gdb_byte *line_ptr;
20082 unsigned int bytes_read, offset_size;
20084 const char *cur_dir, *cur_file;
20085 struct dwarf2_section_info *section;
20088 section = get_debug_line_section (cu);
20089 dwarf2_read_section (dwarf2_per_objfile->objfile, section);
20090 if (section->buffer == NULL)
20092 if (cu->dwo_unit && cu->per_cu->is_debug_types)
20093 complaint (&symfile_complaints, _("missing .debug_line.dwo section"));
20095 complaint (&symfile_complaints, _("missing .debug_line section"));
20099 /* We can't do this until we know the section is non-empty.
20100 Only then do we know we have such a section. */
20101 abfd = get_section_bfd_owner (section);
20103 /* Make sure that at least there's room for the total_length field.
20104 That could be 12 bytes long, but we're just going to fudge that. */
20105 if (to_underlying (sect_off) + 4 >= section->size)
20107 dwarf2_statement_list_fits_in_line_number_section_complaint ();
20111 line_header_up lh (new line_header ());
20113 lh->sect_off = sect_off;
20114 lh->offset_in_dwz = cu->per_cu->is_dwz;
20116 line_ptr = section->buffer + to_underlying (sect_off);
20118 /* Read in the header. */
20120 read_checked_initial_length_and_offset (abfd, line_ptr, &cu->header,
20121 &bytes_read, &offset_size);
20122 line_ptr += bytes_read;
20123 if (line_ptr + lh->total_length > (section->buffer + section->size))
20125 dwarf2_statement_list_fits_in_line_number_section_complaint ();
20128 lh->statement_program_end = line_ptr + lh->total_length;
20129 lh->version = read_2_bytes (abfd, line_ptr);
20131 if (lh->version > 5)
20133 /* This is a version we don't understand. The format could have
20134 changed in ways we don't handle properly so just punt. */
20135 complaint (&symfile_complaints,
20136 _("unsupported version in .debug_line section"));
20139 if (lh->version >= 5)
20141 gdb_byte segment_selector_size;
20143 /* Skip address size. */
20144 read_1_byte (abfd, line_ptr);
20147 segment_selector_size = read_1_byte (abfd, line_ptr);
20149 if (segment_selector_size != 0)
20151 complaint (&symfile_complaints,
20152 _("unsupported segment selector size %u "
20153 "in .debug_line section"),
20154 segment_selector_size);
20158 lh->header_length = read_offset_1 (abfd, line_ptr, offset_size);
20159 line_ptr += offset_size;
20160 lh->minimum_instruction_length = read_1_byte (abfd, line_ptr);
20162 if (lh->version >= 4)
20164 lh->maximum_ops_per_instruction = read_1_byte (abfd, line_ptr);
20168 lh->maximum_ops_per_instruction = 1;
20170 if (lh->maximum_ops_per_instruction == 0)
20172 lh->maximum_ops_per_instruction = 1;
20173 complaint (&symfile_complaints,
20174 _("invalid maximum_ops_per_instruction "
20175 "in `.debug_line' section"));
20178 lh->default_is_stmt = read_1_byte (abfd, line_ptr);
20180 lh->line_base = read_1_signed_byte (abfd, line_ptr);
20182 lh->line_range = read_1_byte (abfd, line_ptr);
20184 lh->opcode_base = read_1_byte (abfd, line_ptr);
20186 lh->standard_opcode_lengths.reset (new unsigned char[lh->opcode_base]);
20188 lh->standard_opcode_lengths[0] = 1; /* This should never be used anyway. */
20189 for (i = 1; i < lh->opcode_base; ++i)
20191 lh->standard_opcode_lengths[i] = read_1_byte (abfd, line_ptr);
20195 if (lh->version >= 5)
20197 /* Read directory table. */
20198 read_formatted_entries (abfd, &line_ptr, lh.get (), &cu->header,
20199 [] (struct line_header *lh, const char *name,
20200 dir_index d_index, unsigned int mod_time,
20201 unsigned int length)
20203 lh->add_include_dir (name);
20206 /* Read file name table. */
20207 read_formatted_entries (abfd, &line_ptr, lh.get (), &cu->header,
20208 [] (struct line_header *lh, const char *name,
20209 dir_index d_index, unsigned int mod_time,
20210 unsigned int length)
20212 lh->add_file_name (name, d_index, mod_time, length);
20217 /* Read directory table. */
20218 while ((cur_dir = read_direct_string (abfd, line_ptr, &bytes_read)) != NULL)
20220 line_ptr += bytes_read;
20221 lh->add_include_dir (cur_dir);
20223 line_ptr += bytes_read;
20225 /* Read file name table. */
20226 while ((cur_file = read_direct_string (abfd, line_ptr, &bytes_read)) != NULL)
20228 unsigned int mod_time, length;
20231 line_ptr += bytes_read;
20232 d_index = (dir_index) read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
20233 line_ptr += bytes_read;
20234 mod_time = read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
20235 line_ptr += bytes_read;
20236 length = read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
20237 line_ptr += bytes_read;
20239 lh->add_file_name (cur_file, d_index, mod_time, length);
20241 line_ptr += bytes_read;
20243 lh->statement_program_start = line_ptr;
20245 if (line_ptr > (section->buffer + section->size))
20246 complaint (&symfile_complaints,
20247 _("line number info header doesn't "
20248 "fit in `.debug_line' section"));
20253 /* Subroutine of dwarf_decode_lines to simplify it.
20254 Return the file name of the psymtab for included file FILE_INDEX
20255 in line header LH of PST.
20256 COMP_DIR is the compilation directory (DW_AT_comp_dir) or NULL if unknown.
20257 If space for the result is malloc'd, it will be freed by a cleanup.
20258 Returns NULL if FILE_INDEX should be ignored, i.e., it is pst->filename.
20260 The function creates dangling cleanup registration. */
20262 static const char *
20263 psymtab_include_file_name (const struct line_header *lh, int file_index,
20264 const struct partial_symtab *pst,
20265 const char *comp_dir)
20267 const file_entry &fe = lh->file_names[file_index];
20268 const char *include_name = fe.name;
20269 const char *include_name_to_compare = include_name;
20270 const char *pst_filename;
20271 char *copied_name = NULL;
20274 const char *dir_name = fe.include_dir (lh);
20276 if (!IS_ABSOLUTE_PATH (include_name)
20277 && (dir_name != NULL || comp_dir != NULL))
20279 /* Avoid creating a duplicate psymtab for PST.
20280 We do this by comparing INCLUDE_NAME and PST_FILENAME.
20281 Before we do the comparison, however, we need to account
20282 for DIR_NAME and COMP_DIR.
20283 First prepend dir_name (if non-NULL). If we still don't
20284 have an absolute path prepend comp_dir (if non-NULL).
20285 However, the directory we record in the include-file's
20286 psymtab does not contain COMP_DIR (to match the
20287 corresponding symtab(s)).
20292 bash$ gcc -g ./hello.c
20293 include_name = "hello.c"
20295 DW_AT_comp_dir = comp_dir = "/tmp"
20296 DW_AT_name = "./hello.c"
20300 if (dir_name != NULL)
20302 char *tem = concat (dir_name, SLASH_STRING,
20303 include_name, (char *)NULL);
20305 make_cleanup (xfree, tem);
20306 include_name = tem;
20307 include_name_to_compare = include_name;
20309 if (!IS_ABSOLUTE_PATH (include_name) && comp_dir != NULL)
20311 char *tem = concat (comp_dir, SLASH_STRING,
20312 include_name, (char *)NULL);
20314 make_cleanup (xfree, tem);
20315 include_name_to_compare = tem;
20319 pst_filename = pst->filename;
20320 if (!IS_ABSOLUTE_PATH (pst_filename) && pst->dirname != NULL)
20322 copied_name = concat (pst->dirname, SLASH_STRING,
20323 pst_filename, (char *)NULL);
20324 pst_filename = copied_name;
20327 file_is_pst = FILENAME_CMP (include_name_to_compare, pst_filename) == 0;
20329 if (copied_name != NULL)
20330 xfree (copied_name);
20334 return include_name;
20337 /* State machine to track the state of the line number program. */
20339 class lnp_state_machine
20342 /* Initialize a machine state for the start of a line number
20344 lnp_state_machine (gdbarch *arch, line_header *lh, bool record_lines_p);
20346 file_entry *current_file ()
20348 /* lh->file_names is 0-based, but the file name numbers in the
20349 statement program are 1-based. */
20350 return m_line_header->file_name_at (m_file);
20353 /* Record the line in the state machine. END_SEQUENCE is true if
20354 we're processing the end of a sequence. */
20355 void record_line (bool end_sequence);
20357 /* Check address and if invalid nop-out the rest of the lines in this
20359 void check_line_address (struct dwarf2_cu *cu,
20360 const gdb_byte *line_ptr,
20361 CORE_ADDR lowpc, CORE_ADDR address);
20363 void handle_set_discriminator (unsigned int discriminator)
20365 m_discriminator = discriminator;
20366 m_line_has_non_zero_discriminator |= discriminator != 0;
20369 /* Handle DW_LNE_set_address. */
20370 void handle_set_address (CORE_ADDR baseaddr, CORE_ADDR address)
20373 address += baseaddr;
20374 m_address = gdbarch_adjust_dwarf2_line (m_gdbarch, address, false);
20377 /* Handle DW_LNS_advance_pc. */
20378 void handle_advance_pc (CORE_ADDR adjust);
20380 /* Handle a special opcode. */
20381 void handle_special_opcode (unsigned char op_code);
20383 /* Handle DW_LNS_advance_line. */
20384 void handle_advance_line (int line_delta)
20386 advance_line (line_delta);
20389 /* Handle DW_LNS_set_file. */
20390 void handle_set_file (file_name_index file);
20392 /* Handle DW_LNS_negate_stmt. */
20393 void handle_negate_stmt ()
20395 m_is_stmt = !m_is_stmt;
20398 /* Handle DW_LNS_const_add_pc. */
20399 void handle_const_add_pc ();
20401 /* Handle DW_LNS_fixed_advance_pc. */
20402 void handle_fixed_advance_pc (CORE_ADDR addr_adj)
20404 m_address += gdbarch_adjust_dwarf2_line (m_gdbarch, addr_adj, true);
20408 /* Handle DW_LNS_copy. */
20409 void handle_copy ()
20411 record_line (false);
20412 m_discriminator = 0;
20415 /* Handle DW_LNE_end_sequence. */
20416 void handle_end_sequence ()
20418 m_record_line_callback = ::record_line;
20422 /* Advance the line by LINE_DELTA. */
20423 void advance_line (int line_delta)
20425 m_line += line_delta;
20427 if (line_delta != 0)
20428 m_line_has_non_zero_discriminator = m_discriminator != 0;
20431 gdbarch *m_gdbarch;
20433 /* True if we're recording lines.
20434 Otherwise we're building partial symtabs and are just interested in
20435 finding include files mentioned by the line number program. */
20436 bool m_record_lines_p;
20438 /* The line number header. */
20439 line_header *m_line_header;
20441 /* These are part of the standard DWARF line number state machine,
20442 and initialized according to the DWARF spec. */
20444 unsigned char m_op_index = 0;
20445 /* The line table index (1-based) of the current file. */
20446 file_name_index m_file = (file_name_index) 1;
20447 unsigned int m_line = 1;
20449 /* These are initialized in the constructor. */
20451 CORE_ADDR m_address;
20453 unsigned int m_discriminator;
20455 /* Additional bits of state we need to track. */
20457 /* The last file that we called dwarf2_start_subfile for.
20458 This is only used for TLLs. */
20459 unsigned int m_last_file = 0;
20460 /* The last file a line number was recorded for. */
20461 struct subfile *m_last_subfile = NULL;
20463 /* The function to call to record a line. */
20464 record_line_ftype *m_record_line_callback = NULL;
20466 /* The last line number that was recorded, used to coalesce
20467 consecutive entries for the same line. This can happen, for
20468 example, when discriminators are present. PR 17276. */
20469 unsigned int m_last_line = 0;
20470 bool m_line_has_non_zero_discriminator = false;
20474 lnp_state_machine::handle_advance_pc (CORE_ADDR adjust)
20476 CORE_ADDR addr_adj = (((m_op_index + adjust)
20477 / m_line_header->maximum_ops_per_instruction)
20478 * m_line_header->minimum_instruction_length);
20479 m_address += gdbarch_adjust_dwarf2_line (m_gdbarch, addr_adj, true);
20480 m_op_index = ((m_op_index + adjust)
20481 % m_line_header->maximum_ops_per_instruction);
20485 lnp_state_machine::handle_special_opcode (unsigned char op_code)
20487 unsigned char adj_opcode = op_code - m_line_header->opcode_base;
20488 CORE_ADDR addr_adj = (((m_op_index
20489 + (adj_opcode / m_line_header->line_range))
20490 / m_line_header->maximum_ops_per_instruction)
20491 * m_line_header->minimum_instruction_length);
20492 m_address += gdbarch_adjust_dwarf2_line (m_gdbarch, addr_adj, true);
20493 m_op_index = ((m_op_index + (adj_opcode / m_line_header->line_range))
20494 % m_line_header->maximum_ops_per_instruction);
20496 int line_delta = (m_line_header->line_base
20497 + (adj_opcode % m_line_header->line_range));
20498 advance_line (line_delta);
20499 record_line (false);
20500 m_discriminator = 0;
20504 lnp_state_machine::handle_set_file (file_name_index file)
20508 const file_entry *fe = current_file ();
20510 dwarf2_debug_line_missing_file_complaint ();
20511 else if (m_record_lines_p)
20513 const char *dir = fe->include_dir (m_line_header);
20515 m_last_subfile = current_subfile;
20516 m_line_has_non_zero_discriminator = m_discriminator != 0;
20517 dwarf2_start_subfile (fe->name, dir);
20522 lnp_state_machine::handle_const_add_pc ()
20525 = (255 - m_line_header->opcode_base) / m_line_header->line_range;
20528 = (((m_op_index + adjust)
20529 / m_line_header->maximum_ops_per_instruction)
20530 * 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);
20537 /* Ignore this record_line request. */
20540 noop_record_line (struct subfile *subfile, int line, CORE_ADDR pc)
20545 /* Return non-zero if we should add LINE to the line number table.
20546 LINE is the line to add, LAST_LINE is the last line that was added,
20547 LAST_SUBFILE is the subfile for LAST_LINE.
20548 LINE_HAS_NON_ZERO_DISCRIMINATOR is non-zero if LINE has ever
20549 had a non-zero discriminator.
20551 We have to be careful in the presence of discriminators.
20552 E.g., for this line:
20554 for (i = 0; i < 100000; i++);
20556 clang can emit four line number entries for that one line,
20557 each with a different discriminator.
20558 See gdb.dwarf2/dw2-single-line-discriminators.exp for an example.
20560 However, we want gdb to coalesce all four entries into one.
20561 Otherwise the user could stepi into the middle of the line and
20562 gdb would get confused about whether the pc really was in the
20563 middle of the line.
20565 Things are further complicated by the fact that two consecutive
20566 line number entries for the same line is a heuristic used by gcc
20567 to denote the end of the prologue. So we can't just discard duplicate
20568 entries, we have to be selective about it. The heuristic we use is
20569 that we only collapse consecutive entries for the same line if at least
20570 one of those entries has a non-zero discriminator. PR 17276.
20572 Note: Addresses in the line number state machine can never go backwards
20573 within one sequence, thus this coalescing is ok. */
20576 dwarf_record_line_p (unsigned int line, unsigned int last_line,
20577 int line_has_non_zero_discriminator,
20578 struct subfile *last_subfile)
20580 if (current_subfile != last_subfile)
20582 if (line != last_line)
20584 /* Same line for the same file that we've seen already.
20585 As a last check, for pr 17276, only record the line if the line
20586 has never had a non-zero discriminator. */
20587 if (!line_has_non_zero_discriminator)
20592 /* Use P_RECORD_LINE to record line number LINE beginning at address ADDRESS
20593 in the line table of subfile SUBFILE. */
20596 dwarf_record_line_1 (struct gdbarch *gdbarch, struct subfile *subfile,
20597 unsigned int line, CORE_ADDR address,
20598 record_line_ftype p_record_line)
20600 CORE_ADDR addr = gdbarch_addr_bits_remove (gdbarch, address);
20602 if (dwarf_line_debug)
20604 fprintf_unfiltered (gdb_stdlog,
20605 "Recording line %u, file %s, address %s\n",
20606 line, lbasename (subfile->name),
20607 paddress (gdbarch, address));
20610 (*p_record_line) (subfile, line, addr);
20613 /* Subroutine of dwarf_decode_lines_1 to simplify it.
20614 Mark the end of a set of line number records.
20615 The arguments are the same as for dwarf_record_line_1.
20616 If SUBFILE is NULL the request is ignored. */
20619 dwarf_finish_line (struct gdbarch *gdbarch, struct subfile *subfile,
20620 CORE_ADDR address, record_line_ftype p_record_line)
20622 if (subfile == NULL)
20625 if (dwarf_line_debug)
20627 fprintf_unfiltered (gdb_stdlog,
20628 "Finishing current line, file %s, address %s\n",
20629 lbasename (subfile->name),
20630 paddress (gdbarch, address));
20633 dwarf_record_line_1 (gdbarch, subfile, 0, address, p_record_line);
20637 lnp_state_machine::record_line (bool end_sequence)
20639 if (dwarf_line_debug)
20641 fprintf_unfiltered (gdb_stdlog,
20642 "Processing actual line %u: file %u,"
20643 " address %s, is_stmt %u, discrim %u\n",
20644 m_line, to_underlying (m_file),
20645 paddress (m_gdbarch, m_address),
20646 m_is_stmt, m_discriminator);
20649 file_entry *fe = current_file ();
20652 dwarf2_debug_line_missing_file_complaint ();
20653 /* For now we ignore lines not starting on an instruction boundary.
20654 But not when processing end_sequence for compatibility with the
20655 previous version of the code. */
20656 else if (m_op_index == 0 || end_sequence)
20658 fe->included_p = 1;
20659 if (m_record_lines_p && m_is_stmt)
20661 if (m_last_subfile != current_subfile || end_sequence)
20663 dwarf_finish_line (m_gdbarch, m_last_subfile,
20664 m_address, m_record_line_callback);
20669 if (dwarf_record_line_p (m_line, m_last_line,
20670 m_line_has_non_zero_discriminator,
20673 dwarf_record_line_1 (m_gdbarch, current_subfile,
20675 m_record_line_callback);
20677 m_last_subfile = current_subfile;
20678 m_last_line = m_line;
20684 lnp_state_machine::lnp_state_machine (gdbarch *arch, line_header *lh,
20685 bool record_lines_p)
20688 m_record_lines_p = record_lines_p;
20689 m_line_header = lh;
20691 m_record_line_callback = ::record_line;
20693 /* Call `gdbarch_adjust_dwarf2_line' on the initial 0 address as if there
20694 was a line entry for it so that the backend has a chance to adjust it
20695 and also record it in case it needs it. This is currently used by MIPS
20696 code, cf. `mips_adjust_dwarf2_line'. */
20697 m_address = gdbarch_adjust_dwarf2_line (arch, 0, 0);
20698 m_is_stmt = lh->default_is_stmt;
20699 m_discriminator = 0;
20703 lnp_state_machine::check_line_address (struct dwarf2_cu *cu,
20704 const gdb_byte *line_ptr,
20705 CORE_ADDR lowpc, CORE_ADDR address)
20707 /* If address < lowpc then it's not a usable value, it's outside the
20708 pc range of the CU. However, we restrict the test to only address
20709 values of zero to preserve GDB's previous behaviour which is to
20710 handle the specific case of a function being GC'd by the linker. */
20712 if (address == 0 && address < lowpc)
20714 /* This line table is for a function which has been
20715 GCd by the linker. Ignore it. PR gdb/12528 */
20717 struct objfile *objfile = cu->objfile;
20718 long line_offset = line_ptr - get_debug_line_section (cu)->buffer;
20720 complaint (&symfile_complaints,
20721 _(".debug_line address at offset 0x%lx is 0 [in module %s]"),
20722 line_offset, objfile_name (objfile));
20723 m_record_line_callback = noop_record_line;
20724 /* Note: record_line_callback is left as noop_record_line until
20725 we see DW_LNE_end_sequence. */
20729 /* Subroutine of dwarf_decode_lines to simplify it.
20730 Process the line number information in LH.
20731 If DECODE_FOR_PST_P is non-zero, all we do is process the line number
20732 program in order to set included_p for every referenced header. */
20735 dwarf_decode_lines_1 (struct line_header *lh, struct dwarf2_cu *cu,
20736 const int decode_for_pst_p, CORE_ADDR lowpc)
20738 const gdb_byte *line_ptr, *extended_end;
20739 const gdb_byte *line_end;
20740 unsigned int bytes_read, extended_len;
20741 unsigned char op_code, extended_op;
20742 CORE_ADDR baseaddr;
20743 struct objfile *objfile = cu->objfile;
20744 bfd *abfd = objfile->obfd;
20745 struct gdbarch *gdbarch = get_objfile_arch (objfile);
20746 /* True if we're recording line info (as opposed to building partial
20747 symtabs and just interested in finding include files mentioned by
20748 the line number program). */
20749 bool record_lines_p = !decode_for_pst_p;
20751 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
20753 line_ptr = lh->statement_program_start;
20754 line_end = lh->statement_program_end;
20756 /* Read the statement sequences until there's nothing left. */
20757 while (line_ptr < line_end)
20759 /* The DWARF line number program state machine. Reset the state
20760 machine at the start of each sequence. */
20761 lnp_state_machine state_machine (gdbarch, lh, record_lines_p);
20762 bool end_sequence = false;
20764 if (record_lines_p)
20766 /* Start a subfile for the current file of the state
20768 const file_entry *fe = state_machine.current_file ();
20771 dwarf2_start_subfile (fe->name, fe->include_dir (lh));
20774 /* Decode the table. */
20775 while (line_ptr < line_end && !end_sequence)
20777 op_code = read_1_byte (abfd, line_ptr);
20780 if (op_code >= lh->opcode_base)
20782 /* Special opcode. */
20783 state_machine.handle_special_opcode (op_code);
20785 else switch (op_code)
20787 case DW_LNS_extended_op:
20788 extended_len = read_unsigned_leb128 (abfd, line_ptr,
20790 line_ptr += bytes_read;
20791 extended_end = line_ptr + extended_len;
20792 extended_op = read_1_byte (abfd, line_ptr);
20794 switch (extended_op)
20796 case DW_LNE_end_sequence:
20797 state_machine.handle_end_sequence ();
20798 end_sequence = true;
20800 case DW_LNE_set_address:
20803 = read_address (abfd, line_ptr, cu, &bytes_read);
20804 line_ptr += bytes_read;
20806 state_machine.check_line_address (cu, line_ptr,
20808 state_machine.handle_set_address (baseaddr, address);
20811 case DW_LNE_define_file:
20813 const char *cur_file;
20814 unsigned int mod_time, length;
20817 cur_file = read_direct_string (abfd, line_ptr,
20819 line_ptr += bytes_read;
20820 dindex = (dir_index)
20821 read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
20822 line_ptr += bytes_read;
20824 read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
20825 line_ptr += bytes_read;
20827 read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
20828 line_ptr += bytes_read;
20829 lh->add_file_name (cur_file, dindex, mod_time, length);
20832 case DW_LNE_set_discriminator:
20834 /* The discriminator is not interesting to the
20835 debugger; just ignore it. We still need to
20836 check its value though:
20837 if there are consecutive entries for the same
20838 (non-prologue) line we want to coalesce them.
20841 = read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
20842 line_ptr += bytes_read;
20844 state_machine.handle_set_discriminator (discr);
20848 complaint (&symfile_complaints,
20849 _("mangled .debug_line section"));
20852 /* Make sure that we parsed the extended op correctly. If e.g.
20853 we expected a different address size than the producer used,
20854 we may have read the wrong number of bytes. */
20855 if (line_ptr != extended_end)
20857 complaint (&symfile_complaints,
20858 _("mangled .debug_line section"));
20863 state_machine.handle_copy ();
20865 case DW_LNS_advance_pc:
20868 = read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
20869 line_ptr += bytes_read;
20871 state_machine.handle_advance_pc (adjust);
20874 case DW_LNS_advance_line:
20877 = read_signed_leb128 (abfd, line_ptr, &bytes_read);
20878 line_ptr += bytes_read;
20880 state_machine.handle_advance_line (line_delta);
20883 case DW_LNS_set_file:
20885 file_name_index file
20886 = (file_name_index) read_unsigned_leb128 (abfd, line_ptr,
20888 line_ptr += bytes_read;
20890 state_machine.handle_set_file (file);
20893 case DW_LNS_set_column:
20894 (void) read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
20895 line_ptr += bytes_read;
20897 case DW_LNS_negate_stmt:
20898 state_machine.handle_negate_stmt ();
20900 case DW_LNS_set_basic_block:
20902 /* Add to the address register of the state machine the
20903 address increment value corresponding to special opcode
20904 255. I.e., this value is scaled by the minimum
20905 instruction length since special opcode 255 would have
20906 scaled the increment. */
20907 case DW_LNS_const_add_pc:
20908 state_machine.handle_const_add_pc ();
20910 case DW_LNS_fixed_advance_pc:
20912 CORE_ADDR addr_adj = read_2_bytes (abfd, line_ptr);
20915 state_machine.handle_fixed_advance_pc (addr_adj);
20920 /* Unknown standard opcode, ignore it. */
20923 for (i = 0; i < lh->standard_opcode_lengths[op_code]; i++)
20925 (void) read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
20926 line_ptr += bytes_read;
20933 dwarf2_debug_line_missing_end_sequence_complaint ();
20935 /* We got a DW_LNE_end_sequence (or we ran off the end of the buffer,
20936 in which case we still finish recording the last line). */
20937 state_machine.record_line (true);
20941 /* Decode the Line Number Program (LNP) for the given line_header
20942 structure and CU. The actual information extracted and the type
20943 of structures created from the LNP depends on the value of PST.
20945 1. If PST is NULL, then this procedure uses the data from the program
20946 to create all necessary symbol tables, and their linetables.
20948 2. If PST is not NULL, this procedure reads the program to determine
20949 the list of files included by the unit represented by PST, and
20950 builds all the associated partial symbol tables.
20952 COMP_DIR is the compilation directory (DW_AT_comp_dir) or NULL if unknown.
20953 It is used for relative paths in the line table.
20954 NOTE: When processing partial symtabs (pst != NULL),
20955 comp_dir == pst->dirname.
20957 NOTE: It is important that psymtabs have the same file name (via strcmp)
20958 as the corresponding symtab. Since COMP_DIR is not used in the name of the
20959 symtab we don't use it in the name of the psymtabs we create.
20960 E.g. expand_line_sal requires this when finding psymtabs to expand.
20961 A good testcase for this is mb-inline.exp.
20963 LOWPC is the lowest address in CU (or 0 if not known).
20965 Boolean DECODE_MAPPING specifies we need to fully decode .debug_line
20966 for its PC<->lines mapping information. Otherwise only the filename
20967 table is read in. */
20970 dwarf_decode_lines (struct line_header *lh, const char *comp_dir,
20971 struct dwarf2_cu *cu, struct partial_symtab *pst,
20972 CORE_ADDR lowpc, int decode_mapping)
20974 struct objfile *objfile = cu->objfile;
20975 const int decode_for_pst_p = (pst != NULL);
20977 if (decode_mapping)
20978 dwarf_decode_lines_1 (lh, cu, decode_for_pst_p, lowpc);
20980 if (decode_for_pst_p)
20984 /* Now that we're done scanning the Line Header Program, we can
20985 create the psymtab of each included file. */
20986 for (file_index = 0; file_index < lh->file_names.size (); file_index++)
20987 if (lh->file_names[file_index].included_p == 1)
20989 const char *include_name =
20990 psymtab_include_file_name (lh, file_index, pst, comp_dir);
20991 if (include_name != NULL)
20992 dwarf2_create_include_psymtab (include_name, pst, objfile);
20997 /* Make sure a symtab is created for every file, even files
20998 which contain only variables (i.e. no code with associated
21000 struct compunit_symtab *cust = buildsym_compunit_symtab ();
21003 for (i = 0; i < lh->file_names.size (); i++)
21005 file_entry &fe = lh->file_names[i];
21007 dwarf2_start_subfile (fe.name, fe.include_dir (lh));
21009 if (current_subfile->symtab == NULL)
21011 current_subfile->symtab
21012 = allocate_symtab (cust, current_subfile->name);
21014 fe.symtab = current_subfile->symtab;
21019 /* Start a subfile for DWARF. FILENAME is the name of the file and
21020 DIRNAME the name of the source directory which contains FILENAME
21021 or NULL if not known.
21022 This routine tries to keep line numbers from identical absolute and
21023 relative file names in a common subfile.
21025 Using the `list' example from the GDB testsuite, which resides in
21026 /srcdir and compiling it with Irix6.2 cc in /compdir using a filename
21027 of /srcdir/list0.c yields the following debugging information for list0.c:
21029 DW_AT_name: /srcdir/list0.c
21030 DW_AT_comp_dir: /compdir
21031 files.files[0].name: list0.h
21032 files.files[0].dir: /srcdir
21033 files.files[1].name: list0.c
21034 files.files[1].dir: /srcdir
21036 The line number information for list0.c has to end up in a single
21037 subfile, so that `break /srcdir/list0.c:1' works as expected.
21038 start_subfile will ensure that this happens provided that we pass the
21039 concatenation of files.files[1].dir and files.files[1].name as the
21043 dwarf2_start_subfile (const char *filename, const char *dirname)
21047 /* In order not to lose the line information directory,
21048 we concatenate it to the filename when it makes sense.
21049 Note that the Dwarf3 standard says (speaking of filenames in line
21050 information): ``The directory index is ignored for file names
21051 that represent full path names''. Thus ignoring dirname in the
21052 `else' branch below isn't an issue. */
21054 if (!IS_ABSOLUTE_PATH (filename) && dirname != NULL)
21056 copy = concat (dirname, SLASH_STRING, filename, (char *)NULL);
21060 start_subfile (filename);
21066 /* Start a symtab for DWARF.
21067 NAME, COMP_DIR, LOW_PC are passed to start_symtab. */
21069 static struct compunit_symtab *
21070 dwarf2_start_symtab (struct dwarf2_cu *cu,
21071 const char *name, const char *comp_dir, CORE_ADDR low_pc)
21073 struct compunit_symtab *cust
21074 = start_symtab (cu->objfile, name, comp_dir, low_pc, cu->language);
21076 record_debugformat ("DWARF 2");
21077 record_producer (cu->producer);
21079 /* We assume that we're processing GCC output. */
21080 processing_gcc_compilation = 2;
21082 cu->processing_has_namespace_info = 0;
21088 var_decode_location (struct attribute *attr, struct symbol *sym,
21089 struct dwarf2_cu *cu)
21091 struct objfile *objfile = cu->objfile;
21092 struct comp_unit_head *cu_header = &cu->header;
21094 /* NOTE drow/2003-01-30: There used to be a comment and some special
21095 code here to turn a symbol with DW_AT_external and a
21096 SYMBOL_VALUE_ADDRESS of 0 into a LOC_UNRESOLVED symbol. This was
21097 necessary for platforms (maybe Alpha, certainly PowerPC GNU/Linux
21098 with some versions of binutils) where shared libraries could have
21099 relocations against symbols in their debug information - the
21100 minimal symbol would have the right address, but the debug info
21101 would not. It's no longer necessary, because we will explicitly
21102 apply relocations when we read in the debug information now. */
21104 /* A DW_AT_location attribute with no contents indicates that a
21105 variable has been optimized away. */
21106 if (attr_form_is_block (attr) && DW_BLOCK (attr)->size == 0)
21108 SYMBOL_ACLASS_INDEX (sym) = LOC_OPTIMIZED_OUT;
21112 /* Handle one degenerate form of location expression specially, to
21113 preserve GDB's previous behavior when section offsets are
21114 specified. If this is just a DW_OP_addr or DW_OP_GNU_addr_index
21115 then mark this symbol as LOC_STATIC. */
21117 if (attr_form_is_block (attr)
21118 && ((DW_BLOCK (attr)->data[0] == DW_OP_addr
21119 && DW_BLOCK (attr)->size == 1 + cu_header->addr_size)
21120 || (DW_BLOCK (attr)->data[0] == DW_OP_GNU_addr_index
21121 && (DW_BLOCK (attr)->size
21122 == 1 + leb128_size (&DW_BLOCK (attr)->data[1])))))
21124 unsigned int dummy;
21126 if (DW_BLOCK (attr)->data[0] == DW_OP_addr)
21127 SYMBOL_VALUE_ADDRESS (sym) =
21128 read_address (objfile->obfd, DW_BLOCK (attr)->data + 1, cu, &dummy);
21130 SYMBOL_VALUE_ADDRESS (sym) =
21131 read_addr_index_from_leb128 (cu, DW_BLOCK (attr)->data + 1, &dummy);
21132 SYMBOL_ACLASS_INDEX (sym) = LOC_STATIC;
21133 fixup_symbol_section (sym, objfile);
21134 SYMBOL_VALUE_ADDRESS (sym) += ANOFFSET (objfile->section_offsets,
21135 SYMBOL_SECTION (sym));
21139 /* NOTE drow/2002-01-30: It might be worthwhile to have a static
21140 expression evaluator, and use LOC_COMPUTED only when necessary
21141 (i.e. when the value of a register or memory location is
21142 referenced, or a thread-local block, etc.). Then again, it might
21143 not be worthwhile. I'm assuming that it isn't unless performance
21144 or memory numbers show me otherwise. */
21146 dwarf2_symbol_mark_computed (attr, sym, cu, 0);
21148 if (SYMBOL_COMPUTED_OPS (sym)->location_has_loclist)
21149 cu->has_loclist = 1;
21152 /* Given a pointer to a DWARF information entry, figure out if we need
21153 to make a symbol table entry for it, and if so, create a new entry
21154 and return a pointer to it.
21155 If TYPE is NULL, determine symbol type from the die, otherwise
21156 used the passed type.
21157 If SPACE is not NULL, use it to hold the new symbol. If it is
21158 NULL, allocate a new symbol on the objfile's obstack. */
21160 static struct symbol *
21161 new_symbol_full (struct die_info *die, struct type *type, struct dwarf2_cu *cu,
21162 struct symbol *space)
21164 struct objfile *objfile = cu->objfile;
21165 struct gdbarch *gdbarch = get_objfile_arch (objfile);
21166 struct symbol *sym = NULL;
21168 struct attribute *attr = NULL;
21169 struct attribute *attr2 = NULL;
21170 CORE_ADDR baseaddr;
21171 struct pending **list_to_add = NULL;
21173 int inlined_func = (die->tag == DW_TAG_inlined_subroutine);
21175 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
21177 name = dwarf2_name (die, cu);
21180 const char *linkagename;
21181 int suppress_add = 0;
21186 sym = allocate_symbol (objfile);
21187 OBJSTAT (objfile, n_syms++);
21189 /* Cache this symbol's name and the name's demangled form (if any). */
21190 SYMBOL_SET_LANGUAGE (sym, cu->language, &objfile->objfile_obstack);
21191 linkagename = dwarf2_physname (name, die, cu);
21192 SYMBOL_SET_NAMES (sym, linkagename, strlen (linkagename), 0, objfile);
21194 /* Fortran does not have mangling standard and the mangling does differ
21195 between gfortran, iFort etc. */
21196 if (cu->language == language_fortran
21197 && symbol_get_demangled_name (&(sym->ginfo)) == NULL)
21198 symbol_set_demangled_name (&(sym->ginfo),
21199 dwarf2_full_name (name, die, cu),
21202 /* Default assumptions.
21203 Use the passed type or decode it from the die. */
21204 SYMBOL_DOMAIN (sym) = VAR_DOMAIN;
21205 SYMBOL_ACLASS_INDEX (sym) = LOC_OPTIMIZED_OUT;
21207 SYMBOL_TYPE (sym) = type;
21209 SYMBOL_TYPE (sym) = die_type (die, cu);
21210 attr = dwarf2_attr (die,
21211 inlined_func ? DW_AT_call_line : DW_AT_decl_line,
21215 SYMBOL_LINE (sym) = DW_UNSND (attr);
21218 attr = dwarf2_attr (die,
21219 inlined_func ? DW_AT_call_file : DW_AT_decl_file,
21223 file_name_index file_index = (file_name_index) DW_UNSND (attr);
21224 struct file_entry *fe;
21226 if (cu->line_header != NULL)
21227 fe = cu->line_header->file_name_at (file_index);
21232 complaint (&symfile_complaints,
21233 _("file index out of range"));
21235 symbol_set_symtab (sym, fe->symtab);
21241 attr = dwarf2_attr (die, DW_AT_low_pc, cu);
21246 addr = attr_value_as_address (attr);
21247 addr = gdbarch_adjust_dwarf2_addr (gdbarch, addr + baseaddr);
21248 SYMBOL_VALUE_ADDRESS (sym) = addr;
21250 SYMBOL_TYPE (sym) = objfile_type (objfile)->builtin_core_addr;
21251 SYMBOL_DOMAIN (sym) = LABEL_DOMAIN;
21252 SYMBOL_ACLASS_INDEX (sym) = LOC_LABEL;
21253 add_symbol_to_list (sym, cu->list_in_scope);
21255 case DW_TAG_subprogram:
21256 /* SYMBOL_BLOCK_VALUE (sym) will be filled in later by
21258 SYMBOL_ACLASS_INDEX (sym) = LOC_BLOCK;
21259 attr2 = dwarf2_attr (die, DW_AT_external, cu);
21260 if ((attr2 && (DW_UNSND (attr2) != 0))
21261 || cu->language == language_ada)
21263 /* Subprograms marked external are stored as a global symbol.
21264 Ada subprograms, whether marked external or not, are always
21265 stored as a global symbol, because we want to be able to
21266 access them globally. For instance, we want to be able
21267 to break on a nested subprogram without having to
21268 specify the context. */
21269 list_to_add = &global_symbols;
21273 list_to_add = cu->list_in_scope;
21276 case DW_TAG_inlined_subroutine:
21277 /* SYMBOL_BLOCK_VALUE (sym) will be filled in later by
21279 SYMBOL_ACLASS_INDEX (sym) = LOC_BLOCK;
21280 SYMBOL_INLINED (sym) = 1;
21281 list_to_add = cu->list_in_scope;
21283 case DW_TAG_template_value_param:
21285 /* Fall through. */
21286 case DW_TAG_constant:
21287 case DW_TAG_variable:
21288 case DW_TAG_member:
21289 /* Compilation with minimal debug info may result in
21290 variables with missing type entries. Change the
21291 misleading `void' type to something sensible. */
21292 if (TYPE_CODE (SYMBOL_TYPE (sym)) == TYPE_CODE_VOID)
21293 SYMBOL_TYPE (sym) = objfile_type (objfile)->builtin_int;
21295 attr = dwarf2_attr (die, DW_AT_const_value, cu);
21296 /* In the case of DW_TAG_member, we should only be called for
21297 static const members. */
21298 if (die->tag == DW_TAG_member)
21300 /* dwarf2_add_field uses die_is_declaration,
21301 so we do the same. */
21302 gdb_assert (die_is_declaration (die, cu));
21307 dwarf2_const_value (attr, sym, cu);
21308 attr2 = dwarf2_attr (die, DW_AT_external, cu);
21311 if (attr2 && (DW_UNSND (attr2) != 0))
21312 list_to_add = &global_symbols;
21314 list_to_add = cu->list_in_scope;
21318 attr = dwarf2_attr (die, DW_AT_location, cu);
21321 var_decode_location (attr, sym, cu);
21322 attr2 = dwarf2_attr (die, DW_AT_external, cu);
21324 /* Fortran explicitly imports any global symbols to the local
21325 scope by DW_TAG_common_block. */
21326 if (cu->language == language_fortran && die->parent
21327 && die->parent->tag == DW_TAG_common_block)
21330 if (SYMBOL_CLASS (sym) == LOC_STATIC
21331 && SYMBOL_VALUE_ADDRESS (sym) == 0
21332 && !dwarf2_per_objfile->has_section_at_zero)
21334 /* When a static variable is eliminated by the linker,
21335 the corresponding debug information is not stripped
21336 out, but the variable address is set to null;
21337 do not add such variables into symbol table. */
21339 else if (attr2 && (DW_UNSND (attr2) != 0))
21341 /* Workaround gfortran PR debug/40040 - it uses
21342 DW_AT_location for variables in -fPIC libraries which may
21343 get overriden by other libraries/executable and get
21344 a different address. Resolve it by the minimal symbol
21345 which may come from inferior's executable using copy
21346 relocation. Make this workaround only for gfortran as for
21347 other compilers GDB cannot guess the minimal symbol
21348 Fortran mangling kind. */
21349 if (cu->language == language_fortran && die->parent
21350 && die->parent->tag == DW_TAG_module
21352 && startswith (cu->producer, "GNU Fortran"))
21353 SYMBOL_ACLASS_INDEX (sym) = LOC_UNRESOLVED;
21355 /* A variable with DW_AT_external is never static,
21356 but it may be block-scoped. */
21357 list_to_add = (cu->list_in_scope == &file_symbols
21358 ? &global_symbols : cu->list_in_scope);
21361 list_to_add = cu->list_in_scope;
21365 /* We do not know the address of this symbol.
21366 If it is an external symbol and we have type information
21367 for it, enter the symbol as a LOC_UNRESOLVED symbol.
21368 The address of the variable will then be determined from
21369 the minimal symbol table whenever the variable is
21371 attr2 = dwarf2_attr (die, DW_AT_external, cu);
21373 /* Fortran explicitly imports any global symbols to the local
21374 scope by DW_TAG_common_block. */
21375 if (cu->language == language_fortran && die->parent
21376 && die->parent->tag == DW_TAG_common_block)
21378 /* SYMBOL_CLASS doesn't matter here because
21379 read_common_block is going to reset it. */
21381 list_to_add = cu->list_in_scope;
21383 else if (attr2 && (DW_UNSND (attr2) != 0)
21384 && dwarf2_attr (die, DW_AT_type, cu) != NULL)
21386 /* A variable with DW_AT_external is never static, but it
21387 may be block-scoped. */
21388 list_to_add = (cu->list_in_scope == &file_symbols
21389 ? &global_symbols : cu->list_in_scope);
21391 SYMBOL_ACLASS_INDEX (sym) = LOC_UNRESOLVED;
21393 else if (!die_is_declaration (die, cu))
21395 /* Use the default LOC_OPTIMIZED_OUT class. */
21396 gdb_assert (SYMBOL_CLASS (sym) == LOC_OPTIMIZED_OUT);
21398 list_to_add = cu->list_in_scope;
21402 case DW_TAG_formal_parameter:
21403 /* If we are inside a function, mark this as an argument. If
21404 not, we might be looking at an argument to an inlined function
21405 when we do not have enough information to show inlined frames;
21406 pretend it's a local variable in that case so that the user can
21408 if (context_stack_depth > 0
21409 && context_stack[context_stack_depth - 1].name != NULL)
21410 SYMBOL_IS_ARGUMENT (sym) = 1;
21411 attr = dwarf2_attr (die, DW_AT_location, cu);
21414 var_decode_location (attr, sym, cu);
21416 attr = dwarf2_attr (die, DW_AT_const_value, cu);
21419 dwarf2_const_value (attr, sym, cu);
21422 list_to_add = cu->list_in_scope;
21424 case DW_TAG_unspecified_parameters:
21425 /* From varargs functions; gdb doesn't seem to have any
21426 interest in this information, so just ignore it for now.
21429 case DW_TAG_template_type_param:
21431 /* Fall through. */
21432 case DW_TAG_class_type:
21433 case DW_TAG_interface_type:
21434 case DW_TAG_structure_type:
21435 case DW_TAG_union_type:
21436 case DW_TAG_set_type:
21437 case DW_TAG_enumeration_type:
21438 SYMBOL_ACLASS_INDEX (sym) = LOC_TYPEDEF;
21439 SYMBOL_DOMAIN (sym) = STRUCT_DOMAIN;
21442 /* NOTE: carlton/2003-11-10: C++ class symbols shouldn't
21443 really ever be static objects: otherwise, if you try
21444 to, say, break of a class's method and you're in a file
21445 which doesn't mention that class, it won't work unless
21446 the check for all static symbols in lookup_symbol_aux
21447 saves you. See the OtherFileClass tests in
21448 gdb.c++/namespace.exp. */
21452 list_to_add = (cu->list_in_scope == &file_symbols
21453 && cu->language == language_cplus
21454 ? &global_symbols : cu->list_in_scope);
21456 /* The semantics of C++ state that "struct foo {
21457 ... }" also defines a typedef for "foo". */
21458 if (cu->language == language_cplus
21459 || cu->language == language_ada
21460 || cu->language == language_d
21461 || cu->language == language_rust)
21463 /* The symbol's name is already allocated along
21464 with this objfile, so we don't need to
21465 duplicate it for the type. */
21466 if (TYPE_NAME (SYMBOL_TYPE (sym)) == 0)
21467 TYPE_NAME (SYMBOL_TYPE (sym)) = SYMBOL_SEARCH_NAME (sym);
21472 case DW_TAG_typedef:
21473 SYMBOL_ACLASS_INDEX (sym) = LOC_TYPEDEF;
21474 SYMBOL_DOMAIN (sym) = VAR_DOMAIN;
21475 list_to_add = cu->list_in_scope;
21477 case DW_TAG_base_type:
21478 case DW_TAG_subrange_type:
21479 SYMBOL_ACLASS_INDEX (sym) = LOC_TYPEDEF;
21480 SYMBOL_DOMAIN (sym) = VAR_DOMAIN;
21481 list_to_add = cu->list_in_scope;
21483 case DW_TAG_enumerator:
21484 attr = dwarf2_attr (die, DW_AT_const_value, cu);
21487 dwarf2_const_value (attr, sym, cu);
21490 /* NOTE: carlton/2003-11-10: See comment above in the
21491 DW_TAG_class_type, etc. block. */
21493 list_to_add = (cu->list_in_scope == &file_symbols
21494 && cu->language == language_cplus
21495 ? &global_symbols : cu->list_in_scope);
21498 case DW_TAG_imported_declaration:
21499 case DW_TAG_namespace:
21500 SYMBOL_ACLASS_INDEX (sym) = LOC_TYPEDEF;
21501 list_to_add = &global_symbols;
21503 case DW_TAG_module:
21504 SYMBOL_ACLASS_INDEX (sym) = LOC_TYPEDEF;
21505 SYMBOL_DOMAIN (sym) = MODULE_DOMAIN;
21506 list_to_add = &global_symbols;
21508 case DW_TAG_common_block:
21509 SYMBOL_ACLASS_INDEX (sym) = LOC_COMMON_BLOCK;
21510 SYMBOL_DOMAIN (sym) = COMMON_BLOCK_DOMAIN;
21511 add_symbol_to_list (sym, cu->list_in_scope);
21514 /* Not a tag we recognize. Hopefully we aren't processing
21515 trash data, but since we must specifically ignore things
21516 we don't recognize, there is nothing else we should do at
21518 complaint (&symfile_complaints, _("unsupported tag: '%s'"),
21519 dwarf_tag_name (die->tag));
21525 sym->hash_next = objfile->template_symbols;
21526 objfile->template_symbols = sym;
21527 list_to_add = NULL;
21530 if (list_to_add != NULL)
21531 add_symbol_to_list (sym, list_to_add);
21533 /* For the benefit of old versions of GCC, check for anonymous
21534 namespaces based on the demangled name. */
21535 if (!cu->processing_has_namespace_info
21536 && cu->language == language_cplus)
21537 cp_scan_for_anonymous_namespaces (sym, objfile);
21542 /* A wrapper for new_symbol_full that always allocates a new symbol. */
21544 static struct symbol *
21545 new_symbol (struct die_info *die, struct type *type, struct dwarf2_cu *cu)
21547 return new_symbol_full (die, type, cu, NULL);
21550 /* Given an attr with a DW_FORM_dataN value in host byte order,
21551 zero-extend it as appropriate for the symbol's type. The DWARF
21552 standard (v4) is not entirely clear about the meaning of using
21553 DW_FORM_dataN for a constant with a signed type, where the type is
21554 wider than the data. The conclusion of a discussion on the DWARF
21555 list was that this is unspecified. We choose to always zero-extend
21556 because that is the interpretation long in use by GCC. */
21559 dwarf2_const_value_data (const struct attribute *attr, struct obstack *obstack,
21560 struct dwarf2_cu *cu, LONGEST *value, int bits)
21562 struct objfile *objfile = cu->objfile;
21563 enum bfd_endian byte_order = bfd_big_endian (objfile->obfd) ?
21564 BFD_ENDIAN_BIG : BFD_ENDIAN_LITTLE;
21565 LONGEST l = DW_UNSND (attr);
21567 if (bits < sizeof (*value) * 8)
21569 l &= ((LONGEST) 1 << bits) - 1;
21572 else if (bits == sizeof (*value) * 8)
21576 gdb_byte *bytes = (gdb_byte *) obstack_alloc (obstack, bits / 8);
21577 store_unsigned_integer (bytes, bits / 8, byte_order, l);
21584 /* Read a constant value from an attribute. Either set *VALUE, or if
21585 the value does not fit in *VALUE, set *BYTES - either already
21586 allocated on the objfile obstack, or newly allocated on OBSTACK,
21587 or, set *BATON, if we translated the constant to a location
21591 dwarf2_const_value_attr (const struct attribute *attr, struct type *type,
21592 const char *name, struct obstack *obstack,
21593 struct dwarf2_cu *cu,
21594 LONGEST *value, const gdb_byte **bytes,
21595 struct dwarf2_locexpr_baton **baton)
21597 struct objfile *objfile = cu->objfile;
21598 struct comp_unit_head *cu_header = &cu->header;
21599 struct dwarf_block *blk;
21600 enum bfd_endian byte_order = (bfd_big_endian (objfile->obfd) ?
21601 BFD_ENDIAN_BIG : BFD_ENDIAN_LITTLE);
21607 switch (attr->form)
21610 case DW_FORM_GNU_addr_index:
21614 if (TYPE_LENGTH (type) != cu_header->addr_size)
21615 dwarf2_const_value_length_mismatch_complaint (name,
21616 cu_header->addr_size,
21617 TYPE_LENGTH (type));
21618 /* Symbols of this form are reasonably rare, so we just
21619 piggyback on the existing location code rather than writing
21620 a new implementation of symbol_computed_ops. */
21621 *baton = XOBNEW (obstack, struct dwarf2_locexpr_baton);
21622 (*baton)->per_cu = cu->per_cu;
21623 gdb_assert ((*baton)->per_cu);
21625 (*baton)->size = 2 + cu_header->addr_size;
21626 data = (gdb_byte *) obstack_alloc (obstack, (*baton)->size);
21627 (*baton)->data = data;
21629 data[0] = DW_OP_addr;
21630 store_unsigned_integer (&data[1], cu_header->addr_size,
21631 byte_order, DW_ADDR (attr));
21632 data[cu_header->addr_size + 1] = DW_OP_stack_value;
21635 case DW_FORM_string:
21637 case DW_FORM_GNU_str_index:
21638 case DW_FORM_GNU_strp_alt:
21639 /* DW_STRING is already allocated on the objfile obstack, point
21641 *bytes = (const gdb_byte *) DW_STRING (attr);
21643 case DW_FORM_block1:
21644 case DW_FORM_block2:
21645 case DW_FORM_block4:
21646 case DW_FORM_block:
21647 case DW_FORM_exprloc:
21648 case DW_FORM_data16:
21649 blk = DW_BLOCK (attr);
21650 if (TYPE_LENGTH (type) != blk->size)
21651 dwarf2_const_value_length_mismatch_complaint (name, blk->size,
21652 TYPE_LENGTH (type));
21653 *bytes = blk->data;
21656 /* The DW_AT_const_value attributes are supposed to carry the
21657 symbol's value "represented as it would be on the target
21658 architecture." By the time we get here, it's already been
21659 converted to host endianness, so we just need to sign- or
21660 zero-extend it as appropriate. */
21661 case DW_FORM_data1:
21662 *bytes = dwarf2_const_value_data (attr, obstack, cu, value, 8);
21664 case DW_FORM_data2:
21665 *bytes = dwarf2_const_value_data (attr, obstack, cu, value, 16);
21667 case DW_FORM_data4:
21668 *bytes = dwarf2_const_value_data (attr, obstack, cu, value, 32);
21670 case DW_FORM_data8:
21671 *bytes = dwarf2_const_value_data (attr, obstack, cu, value, 64);
21674 case DW_FORM_sdata:
21675 case DW_FORM_implicit_const:
21676 *value = DW_SND (attr);
21679 case DW_FORM_udata:
21680 *value = DW_UNSND (attr);
21684 complaint (&symfile_complaints,
21685 _("unsupported const value attribute form: '%s'"),
21686 dwarf_form_name (attr->form));
21693 /* Copy constant value from an attribute to a symbol. */
21696 dwarf2_const_value (const struct attribute *attr, struct symbol *sym,
21697 struct dwarf2_cu *cu)
21699 struct objfile *objfile = cu->objfile;
21701 const gdb_byte *bytes;
21702 struct dwarf2_locexpr_baton *baton;
21704 dwarf2_const_value_attr (attr, SYMBOL_TYPE (sym),
21705 SYMBOL_PRINT_NAME (sym),
21706 &objfile->objfile_obstack, cu,
21707 &value, &bytes, &baton);
21711 SYMBOL_LOCATION_BATON (sym) = baton;
21712 SYMBOL_ACLASS_INDEX (sym) = dwarf2_locexpr_index;
21714 else if (bytes != NULL)
21716 SYMBOL_VALUE_BYTES (sym) = bytes;
21717 SYMBOL_ACLASS_INDEX (sym) = LOC_CONST_BYTES;
21721 SYMBOL_VALUE (sym) = value;
21722 SYMBOL_ACLASS_INDEX (sym) = LOC_CONST;
21726 /* Return the type of the die in question using its DW_AT_type attribute. */
21728 static struct type *
21729 die_type (struct die_info *die, struct dwarf2_cu *cu)
21731 struct attribute *type_attr;
21733 type_attr = dwarf2_attr (die, DW_AT_type, cu);
21736 /* A missing DW_AT_type represents a void type. */
21737 return objfile_type (cu->objfile)->builtin_void;
21740 return lookup_die_type (die, type_attr, cu);
21743 /* True iff CU's producer generates GNAT Ada auxiliary information
21744 that allows to find parallel types through that information instead
21745 of having to do expensive parallel lookups by type name. */
21748 need_gnat_info (struct dwarf2_cu *cu)
21750 /* FIXME: brobecker/2010-10-12: As of now, only the AdaCore version
21751 of GNAT produces this auxiliary information, without any indication
21752 that it is produced. Part of enhancing the FSF version of GNAT
21753 to produce that information will be to put in place an indicator
21754 that we can use in order to determine whether the descriptive type
21755 info is available or not. One suggestion that has been made is
21756 to use a new attribute, attached to the CU die. For now, assume
21757 that the descriptive type info is not available. */
21761 /* Return the auxiliary type of the die in question using its
21762 DW_AT_GNAT_descriptive_type attribute. Returns NULL if the
21763 attribute is not present. */
21765 static struct type *
21766 die_descriptive_type (struct die_info *die, struct dwarf2_cu *cu)
21768 struct attribute *type_attr;
21770 type_attr = dwarf2_attr (die, DW_AT_GNAT_descriptive_type, cu);
21774 return lookup_die_type (die, type_attr, cu);
21777 /* If DIE has a descriptive_type attribute, then set the TYPE's
21778 descriptive type accordingly. */
21781 set_descriptive_type (struct type *type, struct die_info *die,
21782 struct dwarf2_cu *cu)
21784 struct type *descriptive_type = die_descriptive_type (die, cu);
21786 if (descriptive_type)
21788 ALLOCATE_GNAT_AUX_TYPE (type);
21789 TYPE_DESCRIPTIVE_TYPE (type) = descriptive_type;
21793 /* Return the containing type of the die in question using its
21794 DW_AT_containing_type attribute. */
21796 static struct type *
21797 die_containing_type (struct die_info *die, struct dwarf2_cu *cu)
21799 struct attribute *type_attr;
21801 type_attr = dwarf2_attr (die, DW_AT_containing_type, cu);
21803 error (_("Dwarf Error: Problem turning containing type into gdb type "
21804 "[in module %s]"), objfile_name (cu->objfile));
21806 return lookup_die_type (die, type_attr, cu);
21809 /* Return an error marker type to use for the ill formed type in DIE/CU. */
21811 static struct type *
21812 build_error_marker_type (struct dwarf2_cu *cu, struct die_info *die)
21814 struct objfile *objfile = dwarf2_per_objfile->objfile;
21815 char *message, *saved;
21817 message = xstrprintf (_("<unknown type in %s, CU 0x%x, DIE 0x%x>"),
21818 objfile_name (objfile),
21819 to_underlying (cu->header.sect_off),
21820 to_underlying (die->sect_off));
21821 saved = (char *) obstack_copy0 (&objfile->objfile_obstack,
21822 message, strlen (message));
21825 return init_type (objfile, TYPE_CODE_ERROR, 0, saved);
21828 /* Look up the type of DIE in CU using its type attribute ATTR.
21829 ATTR must be one of: DW_AT_type, DW_AT_GNAT_descriptive_type,
21830 DW_AT_containing_type.
21831 If there is no type substitute an error marker. */
21833 static struct type *
21834 lookup_die_type (struct die_info *die, const struct attribute *attr,
21835 struct dwarf2_cu *cu)
21837 struct objfile *objfile = cu->objfile;
21838 struct type *this_type;
21840 gdb_assert (attr->name == DW_AT_type
21841 || attr->name == DW_AT_GNAT_descriptive_type
21842 || attr->name == DW_AT_containing_type);
21844 /* First see if we have it cached. */
21846 if (attr->form == DW_FORM_GNU_ref_alt)
21848 struct dwarf2_per_cu_data *per_cu;
21849 sect_offset sect_off = dwarf2_get_ref_die_offset (attr);
21851 per_cu = dwarf2_find_containing_comp_unit (sect_off, 1, cu->objfile);
21852 this_type = get_die_type_at_offset (sect_off, per_cu);
21854 else if (attr_form_is_ref (attr))
21856 sect_offset sect_off = dwarf2_get_ref_die_offset (attr);
21858 this_type = get_die_type_at_offset (sect_off, cu->per_cu);
21860 else if (attr->form == DW_FORM_ref_sig8)
21862 ULONGEST signature = DW_SIGNATURE (attr);
21864 return get_signatured_type (die, signature, cu);
21868 complaint (&symfile_complaints,
21869 _("Dwarf Error: Bad type attribute %s in DIE"
21870 " at 0x%x [in module %s]"),
21871 dwarf_attr_name (attr->name), to_underlying (die->sect_off),
21872 objfile_name (objfile));
21873 return build_error_marker_type (cu, die);
21876 /* If not cached we need to read it in. */
21878 if (this_type == NULL)
21880 struct die_info *type_die = NULL;
21881 struct dwarf2_cu *type_cu = cu;
21883 if (attr_form_is_ref (attr))
21884 type_die = follow_die_ref (die, attr, &type_cu);
21885 if (type_die == NULL)
21886 return build_error_marker_type (cu, die);
21887 /* If we find the type now, it's probably because the type came
21888 from an inter-CU reference and the type's CU got expanded before
21890 this_type = read_type_die (type_die, type_cu);
21893 /* If we still don't have a type use an error marker. */
21895 if (this_type == NULL)
21896 return build_error_marker_type (cu, die);
21901 /* Return the type in DIE, CU.
21902 Returns NULL for invalid types.
21904 This first does a lookup in die_type_hash,
21905 and only reads the die in if necessary.
21907 NOTE: This can be called when reading in partial or full symbols. */
21909 static struct type *
21910 read_type_die (struct die_info *die, struct dwarf2_cu *cu)
21912 struct type *this_type;
21914 this_type = get_die_type (die, cu);
21918 return read_type_die_1 (die, cu);
21921 /* Read the type in DIE, CU.
21922 Returns NULL for invalid types. */
21924 static struct type *
21925 read_type_die_1 (struct die_info *die, struct dwarf2_cu *cu)
21927 struct type *this_type = NULL;
21931 case DW_TAG_class_type:
21932 case DW_TAG_interface_type:
21933 case DW_TAG_structure_type:
21934 case DW_TAG_union_type:
21935 this_type = read_structure_type (die, cu);
21937 case DW_TAG_enumeration_type:
21938 this_type = read_enumeration_type (die, cu);
21940 case DW_TAG_subprogram:
21941 case DW_TAG_subroutine_type:
21942 case DW_TAG_inlined_subroutine:
21943 this_type = read_subroutine_type (die, cu);
21945 case DW_TAG_array_type:
21946 this_type = read_array_type (die, cu);
21948 case DW_TAG_set_type:
21949 this_type = read_set_type (die, cu);
21951 case DW_TAG_pointer_type:
21952 this_type = read_tag_pointer_type (die, cu);
21954 case DW_TAG_ptr_to_member_type:
21955 this_type = read_tag_ptr_to_member_type (die, cu);
21957 case DW_TAG_reference_type:
21958 this_type = read_tag_reference_type (die, cu, TYPE_CODE_REF);
21960 case DW_TAG_rvalue_reference_type:
21961 this_type = read_tag_reference_type (die, cu, TYPE_CODE_RVALUE_REF);
21963 case DW_TAG_const_type:
21964 this_type = read_tag_const_type (die, cu);
21966 case DW_TAG_volatile_type:
21967 this_type = read_tag_volatile_type (die, cu);
21969 case DW_TAG_restrict_type:
21970 this_type = read_tag_restrict_type (die, cu);
21972 case DW_TAG_string_type:
21973 this_type = read_tag_string_type (die, cu);
21975 case DW_TAG_typedef:
21976 this_type = read_typedef (die, cu);
21978 case DW_TAG_subrange_type:
21979 this_type = read_subrange_type (die, cu);
21981 case DW_TAG_base_type:
21982 this_type = read_base_type (die, cu);
21984 case DW_TAG_unspecified_type:
21985 this_type = read_unspecified_type (die, cu);
21987 case DW_TAG_namespace:
21988 this_type = read_namespace_type (die, cu);
21990 case DW_TAG_module:
21991 this_type = read_module_type (die, cu);
21993 case DW_TAG_atomic_type:
21994 this_type = read_tag_atomic_type (die, cu);
21997 complaint (&symfile_complaints,
21998 _("unexpected tag in read_type_die: '%s'"),
21999 dwarf_tag_name (die->tag));
22006 /* See if we can figure out if the class lives in a namespace. We do
22007 this by looking for a member function; its demangled name will
22008 contain namespace info, if there is any.
22009 Return the computed name or NULL.
22010 Space for the result is allocated on the objfile's obstack.
22011 This is the full-die version of guess_partial_die_structure_name.
22012 In this case we know DIE has no useful parent. */
22015 guess_full_die_structure_name (struct die_info *die, struct dwarf2_cu *cu)
22017 struct die_info *spec_die;
22018 struct dwarf2_cu *spec_cu;
22019 struct die_info *child;
22022 spec_die = die_specification (die, &spec_cu);
22023 if (spec_die != NULL)
22029 for (child = die->child;
22031 child = child->sibling)
22033 if (child->tag == DW_TAG_subprogram)
22035 const char *linkage_name = dw2_linkage_name (child, cu);
22037 if (linkage_name != NULL)
22040 = language_class_name_from_physname (cu->language_defn,
22044 if (actual_name != NULL)
22046 const char *die_name = dwarf2_name (die, cu);
22048 if (die_name != NULL
22049 && strcmp (die_name, actual_name) != 0)
22051 /* Strip off the class name from the full name.
22052 We want the prefix. */
22053 int die_name_len = strlen (die_name);
22054 int actual_name_len = strlen (actual_name);
22056 /* Test for '::' as a sanity check. */
22057 if (actual_name_len > die_name_len + 2
22058 && actual_name[actual_name_len
22059 - die_name_len - 1] == ':')
22060 name = (char *) obstack_copy0 (
22061 &cu->objfile->per_bfd->storage_obstack,
22062 actual_name, actual_name_len - die_name_len - 2);
22065 xfree (actual_name);
22074 /* GCC might emit a nameless typedef that has a linkage name. Determine the
22075 prefix part in such case. See
22076 http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47510. */
22078 static const char *
22079 anonymous_struct_prefix (struct die_info *die, struct dwarf2_cu *cu)
22081 struct attribute *attr;
22084 if (die->tag != DW_TAG_class_type && die->tag != DW_TAG_interface_type
22085 && die->tag != DW_TAG_structure_type && die->tag != DW_TAG_union_type)
22088 if (dwarf2_string_attr (die, DW_AT_name, cu) != NULL)
22091 attr = dw2_linkage_name_attr (die, cu);
22092 if (attr == NULL || DW_STRING (attr) == NULL)
22095 /* dwarf2_name had to be already called. */
22096 gdb_assert (DW_STRING_IS_CANONICAL (attr));
22098 /* Strip the base name, keep any leading namespaces/classes. */
22099 base = strrchr (DW_STRING (attr), ':');
22100 if (base == NULL || base == DW_STRING (attr) || base[-1] != ':')
22103 return (char *) obstack_copy0 (&cu->objfile->per_bfd->storage_obstack,
22105 &base[-1] - DW_STRING (attr));
22108 /* Return the name of the namespace/class that DIE is defined within,
22109 or "" if we can't tell. The caller should not xfree the result.
22111 For example, if we're within the method foo() in the following
22121 then determine_prefix on foo's die will return "N::C". */
22123 static const char *
22124 determine_prefix (struct die_info *die, struct dwarf2_cu *cu)
22126 struct die_info *parent, *spec_die;
22127 struct dwarf2_cu *spec_cu;
22128 struct type *parent_type;
22129 const char *retval;
22131 if (cu->language != language_cplus
22132 && cu->language != language_fortran && cu->language != language_d
22133 && cu->language != language_rust)
22136 retval = anonymous_struct_prefix (die, cu);
22140 /* We have to be careful in the presence of DW_AT_specification.
22141 For example, with GCC 3.4, given the code
22145 // Definition of N::foo.
22149 then we'll have a tree of DIEs like this:
22151 1: DW_TAG_compile_unit
22152 2: DW_TAG_namespace // N
22153 3: DW_TAG_subprogram // declaration of N::foo
22154 4: DW_TAG_subprogram // definition of N::foo
22155 DW_AT_specification // refers to die #3
22157 Thus, when processing die #4, we have to pretend that we're in
22158 the context of its DW_AT_specification, namely the contex of die
22161 spec_die = die_specification (die, &spec_cu);
22162 if (spec_die == NULL)
22163 parent = die->parent;
22166 parent = spec_die->parent;
22170 if (parent == NULL)
22172 else if (parent->building_fullname)
22175 const char *parent_name;
22177 /* It has been seen on RealView 2.2 built binaries,
22178 DW_TAG_template_type_param types actually _defined_ as
22179 children of the parent class:
22182 template class <class Enum> Class{};
22183 Class<enum E> class_e;
22185 1: DW_TAG_class_type (Class)
22186 2: DW_TAG_enumeration_type (E)
22187 3: DW_TAG_enumerator (enum1:0)
22188 3: DW_TAG_enumerator (enum2:1)
22190 2: DW_TAG_template_type_param
22191 DW_AT_type DW_FORM_ref_udata (E)
22193 Besides being broken debug info, it can put GDB into an
22194 infinite loop. Consider:
22196 When we're building the full name for Class<E>, we'll start
22197 at Class, and go look over its template type parameters,
22198 finding E. We'll then try to build the full name of E, and
22199 reach here. We're now trying to build the full name of E,
22200 and look over the parent DIE for containing scope. In the
22201 broken case, if we followed the parent DIE of E, we'd again
22202 find Class, and once again go look at its template type
22203 arguments, etc., etc. Simply don't consider such parent die
22204 as source-level parent of this die (it can't be, the language
22205 doesn't allow it), and break the loop here. */
22206 name = dwarf2_name (die, cu);
22207 parent_name = dwarf2_name (parent, cu);
22208 complaint (&symfile_complaints,
22209 _("template param type '%s' defined within parent '%s'"),
22210 name ? name : "<unknown>",
22211 parent_name ? parent_name : "<unknown>");
22215 switch (parent->tag)
22217 case DW_TAG_namespace:
22218 parent_type = read_type_die (parent, cu);
22219 /* GCC 4.0 and 4.1 had a bug (PR c++/28460) where they generated bogus
22220 DW_TAG_namespace DIEs with a name of "::" for the global namespace.
22221 Work around this problem here. */
22222 if (cu->language == language_cplus
22223 && strcmp (TYPE_TAG_NAME (parent_type), "::") == 0)
22225 /* We give a name to even anonymous namespaces. */
22226 return TYPE_TAG_NAME (parent_type);
22227 case DW_TAG_class_type:
22228 case DW_TAG_interface_type:
22229 case DW_TAG_structure_type:
22230 case DW_TAG_union_type:
22231 case DW_TAG_module:
22232 parent_type = read_type_die (parent, cu);
22233 if (TYPE_TAG_NAME (parent_type) != NULL)
22234 return TYPE_TAG_NAME (parent_type);
22236 /* An anonymous structure is only allowed non-static data
22237 members; no typedefs, no member functions, et cetera.
22238 So it does not need a prefix. */
22240 case DW_TAG_compile_unit:
22241 case DW_TAG_partial_unit:
22242 /* gcc-4.5 -gdwarf-4 can drop the enclosing namespace. Cope. */
22243 if (cu->language == language_cplus
22244 && !VEC_empty (dwarf2_section_info_def, dwarf2_per_objfile->types)
22245 && die->child != NULL
22246 && (die->tag == DW_TAG_class_type
22247 || die->tag == DW_TAG_structure_type
22248 || die->tag == DW_TAG_union_type))
22250 char *name = guess_full_die_structure_name (die, cu);
22255 case DW_TAG_enumeration_type:
22256 parent_type = read_type_die (parent, cu);
22257 if (TYPE_DECLARED_CLASS (parent_type))
22259 if (TYPE_TAG_NAME (parent_type) != NULL)
22260 return TYPE_TAG_NAME (parent_type);
22263 /* Fall through. */
22265 return determine_prefix (parent, cu);
22269 /* Return a newly-allocated string formed by concatenating PREFIX and SUFFIX
22270 with appropriate separator. If PREFIX or SUFFIX is NULL or empty, then
22271 simply copy the SUFFIX or PREFIX, respectively. If OBS is non-null, perform
22272 an obconcat, otherwise allocate storage for the result. The CU argument is
22273 used to determine the language and hence, the appropriate separator. */
22275 #define MAX_SEP_LEN 7 /* strlen ("__") + strlen ("_MOD_") */
22278 typename_concat (struct obstack *obs, const char *prefix, const char *suffix,
22279 int physname, struct dwarf2_cu *cu)
22281 const char *lead = "";
22284 if (suffix == NULL || suffix[0] == '\0'
22285 || prefix == NULL || prefix[0] == '\0')
22287 else if (cu->language == language_d)
22289 /* For D, the 'main' function could be defined in any module, but it
22290 should never be prefixed. */
22291 if (strcmp (suffix, "D main") == 0)
22299 else if (cu->language == language_fortran && physname)
22301 /* This is gfortran specific mangling. Normally DW_AT_linkage_name or
22302 DW_AT_MIPS_linkage_name is preferred and used instead. */
22310 if (prefix == NULL)
22312 if (suffix == NULL)
22319 xmalloc (strlen (prefix) + MAX_SEP_LEN + strlen (suffix) + 1));
22321 strcpy (retval, lead);
22322 strcat (retval, prefix);
22323 strcat (retval, sep);
22324 strcat (retval, suffix);
22329 /* We have an obstack. */
22330 return obconcat (obs, lead, prefix, sep, suffix, (char *) NULL);
22334 /* Return sibling of die, NULL if no sibling. */
22336 static struct die_info *
22337 sibling_die (struct die_info *die)
22339 return die->sibling;
22342 /* Get name of a die, return NULL if not found. */
22344 static const char *
22345 dwarf2_canonicalize_name (const char *name, struct dwarf2_cu *cu,
22346 struct obstack *obstack)
22348 if (name && cu->language == language_cplus)
22350 std::string canon_name = cp_canonicalize_string (name);
22352 if (!canon_name.empty ())
22354 if (canon_name != name)
22355 name = (const char *) obstack_copy0 (obstack,
22356 canon_name.c_str (),
22357 canon_name.length ());
22364 /* Get name of a die, return NULL if not found.
22365 Anonymous namespaces are converted to their magic string. */
22367 static const char *
22368 dwarf2_name (struct die_info *die, struct dwarf2_cu *cu)
22370 struct attribute *attr;
22372 attr = dwarf2_attr (die, DW_AT_name, cu);
22373 if ((!attr || !DW_STRING (attr))
22374 && die->tag != DW_TAG_namespace
22375 && die->tag != DW_TAG_class_type
22376 && die->tag != DW_TAG_interface_type
22377 && die->tag != DW_TAG_structure_type
22378 && die->tag != DW_TAG_union_type)
22383 case DW_TAG_compile_unit:
22384 case DW_TAG_partial_unit:
22385 /* Compilation units have a DW_AT_name that is a filename, not
22386 a source language identifier. */
22387 case DW_TAG_enumeration_type:
22388 case DW_TAG_enumerator:
22389 /* These tags always have simple identifiers already; no need
22390 to canonicalize them. */
22391 return DW_STRING (attr);
22393 case DW_TAG_namespace:
22394 if (attr != NULL && DW_STRING (attr) != NULL)
22395 return DW_STRING (attr);
22396 return CP_ANONYMOUS_NAMESPACE_STR;
22398 case DW_TAG_class_type:
22399 case DW_TAG_interface_type:
22400 case DW_TAG_structure_type:
22401 case DW_TAG_union_type:
22402 /* Some GCC versions emit spurious DW_AT_name attributes for unnamed
22403 structures or unions. These were of the form "._%d" in GCC 4.1,
22404 or simply "<anonymous struct>" or "<anonymous union>" in GCC 4.3
22405 and GCC 4.4. We work around this problem by ignoring these. */
22406 if (attr && DW_STRING (attr)
22407 && (startswith (DW_STRING (attr), "._")
22408 || startswith (DW_STRING (attr), "<anonymous")))
22411 /* GCC might emit a nameless typedef that has a linkage name. See
22412 http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47510. */
22413 if (!attr || DW_STRING (attr) == NULL)
22415 char *demangled = NULL;
22417 attr = dw2_linkage_name_attr (die, cu);
22418 if (attr == NULL || DW_STRING (attr) == NULL)
22421 /* Avoid demangling DW_STRING (attr) the second time on a second
22422 call for the same DIE. */
22423 if (!DW_STRING_IS_CANONICAL (attr))
22424 demangled = gdb_demangle (DW_STRING (attr), DMGL_TYPES);
22430 /* FIXME: we already did this for the partial symbol... */
22433 obstack_copy0 (&cu->objfile->per_bfd->storage_obstack,
22434 demangled, strlen (demangled)));
22435 DW_STRING_IS_CANONICAL (attr) = 1;
22438 /* Strip any leading namespaces/classes, keep only the base name.
22439 DW_AT_name for named DIEs does not contain the prefixes. */
22440 base = strrchr (DW_STRING (attr), ':');
22441 if (base && base > DW_STRING (attr) && base[-1] == ':')
22444 return DW_STRING (attr);
22453 if (!DW_STRING_IS_CANONICAL (attr))
22456 = dwarf2_canonicalize_name (DW_STRING (attr), cu,
22457 &cu->objfile->per_bfd->storage_obstack);
22458 DW_STRING_IS_CANONICAL (attr) = 1;
22460 return DW_STRING (attr);
22463 /* Return the die that this die in an extension of, or NULL if there
22464 is none. *EXT_CU is the CU containing DIE on input, and the CU
22465 containing the return value on output. */
22467 static struct die_info *
22468 dwarf2_extension (struct die_info *die, struct dwarf2_cu **ext_cu)
22470 struct attribute *attr;
22472 attr = dwarf2_attr (die, DW_AT_extension, *ext_cu);
22476 return follow_die_ref (die, attr, ext_cu);
22479 /* Convert a DIE tag into its string name. */
22481 static const char *
22482 dwarf_tag_name (unsigned tag)
22484 const char *name = get_DW_TAG_name (tag);
22487 return "DW_TAG_<unknown>";
22492 /* Convert a DWARF attribute code into its string name. */
22494 static const char *
22495 dwarf_attr_name (unsigned attr)
22499 #ifdef MIPS /* collides with DW_AT_HP_block_index */
22500 if (attr == DW_AT_MIPS_fde)
22501 return "DW_AT_MIPS_fde";
22503 if (attr == DW_AT_HP_block_index)
22504 return "DW_AT_HP_block_index";
22507 name = get_DW_AT_name (attr);
22510 return "DW_AT_<unknown>";
22515 /* Convert a DWARF value form code into its string name. */
22517 static const char *
22518 dwarf_form_name (unsigned form)
22520 const char *name = get_DW_FORM_name (form);
22523 return "DW_FORM_<unknown>";
22528 static const char *
22529 dwarf_bool_name (unsigned mybool)
22537 /* Convert a DWARF type code into its string name. */
22539 static const char *
22540 dwarf_type_encoding_name (unsigned enc)
22542 const char *name = get_DW_ATE_name (enc);
22545 return "DW_ATE_<unknown>";
22551 dump_die_shallow (struct ui_file *f, int indent, struct die_info *die)
22555 print_spaces (indent, f);
22556 fprintf_unfiltered (f, "Die: %s (abbrev %d, offset 0x%x)\n",
22557 dwarf_tag_name (die->tag), die->abbrev,
22558 to_underlying (die->sect_off));
22560 if (die->parent != NULL)
22562 print_spaces (indent, f);
22563 fprintf_unfiltered (f, " parent at offset: 0x%x\n",
22564 to_underlying (die->parent->sect_off));
22567 print_spaces (indent, f);
22568 fprintf_unfiltered (f, " has children: %s\n",
22569 dwarf_bool_name (die->child != NULL));
22571 print_spaces (indent, f);
22572 fprintf_unfiltered (f, " attributes:\n");
22574 for (i = 0; i < die->num_attrs; ++i)
22576 print_spaces (indent, f);
22577 fprintf_unfiltered (f, " %s (%s) ",
22578 dwarf_attr_name (die->attrs[i].name),
22579 dwarf_form_name (die->attrs[i].form));
22581 switch (die->attrs[i].form)
22584 case DW_FORM_GNU_addr_index:
22585 fprintf_unfiltered (f, "address: ");
22586 fputs_filtered (hex_string (DW_ADDR (&die->attrs[i])), f);
22588 case DW_FORM_block2:
22589 case DW_FORM_block4:
22590 case DW_FORM_block:
22591 case DW_FORM_block1:
22592 fprintf_unfiltered (f, "block: size %s",
22593 pulongest (DW_BLOCK (&die->attrs[i])->size));
22595 case DW_FORM_exprloc:
22596 fprintf_unfiltered (f, "expression: size %s",
22597 pulongest (DW_BLOCK (&die->attrs[i])->size));
22599 case DW_FORM_data16:
22600 fprintf_unfiltered (f, "constant of 16 bytes");
22602 case DW_FORM_ref_addr:
22603 fprintf_unfiltered (f, "ref address: ");
22604 fputs_filtered (hex_string (DW_UNSND (&die->attrs[i])), f);
22606 case DW_FORM_GNU_ref_alt:
22607 fprintf_unfiltered (f, "alt ref address: ");
22608 fputs_filtered (hex_string (DW_UNSND (&die->attrs[i])), f);
22614 case DW_FORM_ref_udata:
22615 fprintf_unfiltered (f, "constant ref: 0x%lx (adjusted)",
22616 (long) (DW_UNSND (&die->attrs[i])));
22618 case DW_FORM_data1:
22619 case DW_FORM_data2:
22620 case DW_FORM_data4:
22621 case DW_FORM_data8:
22622 case DW_FORM_udata:
22623 case DW_FORM_sdata:
22624 fprintf_unfiltered (f, "constant: %s",
22625 pulongest (DW_UNSND (&die->attrs[i])));
22627 case DW_FORM_sec_offset:
22628 fprintf_unfiltered (f, "section offset: %s",
22629 pulongest (DW_UNSND (&die->attrs[i])));
22631 case DW_FORM_ref_sig8:
22632 fprintf_unfiltered (f, "signature: %s",
22633 hex_string (DW_SIGNATURE (&die->attrs[i])));
22635 case DW_FORM_string:
22637 case DW_FORM_line_strp:
22638 case DW_FORM_GNU_str_index:
22639 case DW_FORM_GNU_strp_alt:
22640 fprintf_unfiltered (f, "string: \"%s\" (%s canonicalized)",
22641 DW_STRING (&die->attrs[i])
22642 ? DW_STRING (&die->attrs[i]) : "",
22643 DW_STRING_IS_CANONICAL (&die->attrs[i]) ? "is" : "not");
22646 if (DW_UNSND (&die->attrs[i]))
22647 fprintf_unfiltered (f, "flag: TRUE");
22649 fprintf_unfiltered (f, "flag: FALSE");
22651 case DW_FORM_flag_present:
22652 fprintf_unfiltered (f, "flag: TRUE");
22654 case DW_FORM_indirect:
22655 /* The reader will have reduced the indirect form to
22656 the "base form" so this form should not occur. */
22657 fprintf_unfiltered (f,
22658 "unexpected attribute form: DW_FORM_indirect");
22660 case DW_FORM_implicit_const:
22661 fprintf_unfiltered (f, "constant: %s",
22662 plongest (DW_SND (&die->attrs[i])));
22665 fprintf_unfiltered (f, "unsupported attribute form: %d.",
22666 die->attrs[i].form);
22669 fprintf_unfiltered (f, "\n");
22674 dump_die_for_error (struct die_info *die)
22676 dump_die_shallow (gdb_stderr, 0, die);
22680 dump_die_1 (struct ui_file *f, int level, int max_level, struct die_info *die)
22682 int indent = level * 4;
22684 gdb_assert (die != NULL);
22686 if (level >= max_level)
22689 dump_die_shallow (f, indent, die);
22691 if (die->child != NULL)
22693 print_spaces (indent, f);
22694 fprintf_unfiltered (f, " Children:");
22695 if (level + 1 < max_level)
22697 fprintf_unfiltered (f, "\n");
22698 dump_die_1 (f, level + 1, max_level, die->child);
22702 fprintf_unfiltered (f,
22703 " [not printed, max nesting level reached]\n");
22707 if (die->sibling != NULL && level > 0)
22709 dump_die_1 (f, level, max_level, die->sibling);
22713 /* This is called from the pdie macro in gdbinit.in.
22714 It's not static so gcc will keep a copy callable from gdb. */
22717 dump_die (struct die_info *die, int max_level)
22719 dump_die_1 (gdb_stdlog, 0, max_level, die);
22723 store_in_ref_table (struct die_info *die, struct dwarf2_cu *cu)
22727 slot = htab_find_slot_with_hash (cu->die_hash, die,
22728 to_underlying (die->sect_off),
22734 /* Return DIE offset of ATTR. Return 0 with complaint if ATTR is not of the
22738 dwarf2_get_ref_die_offset (const struct attribute *attr)
22740 if (attr_form_is_ref (attr))
22741 return (sect_offset) DW_UNSND (attr);
22743 complaint (&symfile_complaints,
22744 _("unsupported die ref attribute form: '%s'"),
22745 dwarf_form_name (attr->form));
22749 /* Return the constant value held by ATTR. Return DEFAULT_VALUE if
22750 * the value held by the attribute is not constant. */
22753 dwarf2_get_attr_constant_value (const struct attribute *attr, int default_value)
22755 if (attr->form == DW_FORM_sdata || attr->form == DW_FORM_implicit_const)
22756 return DW_SND (attr);
22757 else if (attr->form == DW_FORM_udata
22758 || attr->form == DW_FORM_data1
22759 || attr->form == DW_FORM_data2
22760 || attr->form == DW_FORM_data4
22761 || attr->form == DW_FORM_data8)
22762 return DW_UNSND (attr);
22765 /* For DW_FORM_data16 see attr_form_is_constant. */
22766 complaint (&symfile_complaints,
22767 _("Attribute value is not a constant (%s)"),
22768 dwarf_form_name (attr->form));
22769 return default_value;
22773 /* Follow reference or signature attribute ATTR of SRC_DIE.
22774 On entry *REF_CU is the CU of SRC_DIE.
22775 On exit *REF_CU is the CU of the result. */
22777 static struct die_info *
22778 follow_die_ref_or_sig (struct die_info *src_die, const struct attribute *attr,
22779 struct dwarf2_cu **ref_cu)
22781 struct die_info *die;
22783 if (attr_form_is_ref (attr))
22784 die = follow_die_ref (src_die, attr, ref_cu);
22785 else if (attr->form == DW_FORM_ref_sig8)
22786 die = follow_die_sig (src_die, attr, ref_cu);
22789 dump_die_for_error (src_die);
22790 error (_("Dwarf Error: Expected reference attribute [in module %s]"),
22791 objfile_name ((*ref_cu)->objfile));
22797 /* Follow reference OFFSET.
22798 On entry *REF_CU is the CU of the source die referencing OFFSET.
22799 On exit *REF_CU is the CU of the result.
22800 Returns NULL if OFFSET is invalid. */
22802 static struct die_info *
22803 follow_die_offset (sect_offset sect_off, int offset_in_dwz,
22804 struct dwarf2_cu **ref_cu)
22806 struct die_info temp_die;
22807 struct dwarf2_cu *target_cu, *cu = *ref_cu;
22809 gdb_assert (cu->per_cu != NULL);
22813 if (cu->per_cu->is_debug_types)
22815 /* .debug_types CUs cannot reference anything outside their CU.
22816 If they need to, they have to reference a signatured type via
22817 DW_FORM_ref_sig8. */
22818 if (!offset_in_cu_p (&cu->header, sect_off))
22821 else if (offset_in_dwz != cu->per_cu->is_dwz
22822 || !offset_in_cu_p (&cu->header, sect_off))
22824 struct dwarf2_per_cu_data *per_cu;
22826 per_cu = dwarf2_find_containing_comp_unit (sect_off, offset_in_dwz,
22829 /* If necessary, add it to the queue and load its DIEs. */
22830 if (maybe_queue_comp_unit (cu, per_cu, cu->language))
22831 load_full_comp_unit (per_cu, cu->language);
22833 target_cu = per_cu->cu;
22835 else if (cu->dies == NULL)
22837 /* We're loading full DIEs during partial symbol reading. */
22838 gdb_assert (dwarf2_per_objfile->reading_partial_symbols);
22839 load_full_comp_unit (cu->per_cu, language_minimal);
22842 *ref_cu = target_cu;
22843 temp_die.sect_off = sect_off;
22844 return (struct die_info *) htab_find_with_hash (target_cu->die_hash,
22846 to_underlying (sect_off));
22849 /* Follow reference attribute ATTR of SRC_DIE.
22850 On entry *REF_CU is the CU of SRC_DIE.
22851 On exit *REF_CU is the CU of the result. */
22853 static struct die_info *
22854 follow_die_ref (struct die_info *src_die, const struct attribute *attr,
22855 struct dwarf2_cu **ref_cu)
22857 sect_offset sect_off = dwarf2_get_ref_die_offset (attr);
22858 struct dwarf2_cu *cu = *ref_cu;
22859 struct die_info *die;
22861 die = follow_die_offset (sect_off,
22862 (attr->form == DW_FORM_GNU_ref_alt
22863 || cu->per_cu->is_dwz),
22866 error (_("Dwarf Error: Cannot find DIE at 0x%x referenced from DIE "
22867 "at 0x%x [in module %s]"),
22868 to_underlying (sect_off), to_underlying (src_die->sect_off),
22869 objfile_name (cu->objfile));
22874 /* Return DWARF block referenced by DW_AT_location of DIE at SECT_OFF at PER_CU.
22875 Returned value is intended for DW_OP_call*. Returned
22876 dwarf2_locexpr_baton->data has lifetime of PER_CU->OBJFILE. */
22878 struct dwarf2_locexpr_baton
22879 dwarf2_fetch_die_loc_sect_off (sect_offset sect_off,
22880 struct dwarf2_per_cu_data *per_cu,
22881 CORE_ADDR (*get_frame_pc) (void *baton),
22884 struct dwarf2_cu *cu;
22885 struct die_info *die;
22886 struct attribute *attr;
22887 struct dwarf2_locexpr_baton retval;
22889 dw2_setup (per_cu->objfile);
22891 if (per_cu->cu == NULL)
22896 /* We shouldn't get here for a dummy CU, but don't crash on the user.
22897 Instead just throw an error, not much else we can do. */
22898 error (_("Dwarf Error: Dummy CU at 0x%x referenced in module %s"),
22899 to_underlying (sect_off), objfile_name (per_cu->objfile));
22902 die = follow_die_offset (sect_off, per_cu->is_dwz, &cu);
22904 error (_("Dwarf Error: Cannot find DIE at 0x%x referenced in module %s"),
22905 to_underlying (sect_off), objfile_name (per_cu->objfile));
22907 attr = dwarf2_attr (die, DW_AT_location, cu);
22910 /* DWARF: "If there is no such attribute, then there is no effect.".
22911 DATA is ignored if SIZE is 0. */
22913 retval.data = NULL;
22916 else if (attr_form_is_section_offset (attr))
22918 struct dwarf2_loclist_baton loclist_baton;
22919 CORE_ADDR pc = (*get_frame_pc) (baton);
22922 fill_in_loclist_baton (cu, &loclist_baton, attr);
22924 retval.data = dwarf2_find_location_expression (&loclist_baton,
22926 retval.size = size;
22930 if (!attr_form_is_block (attr))
22931 error (_("Dwarf Error: DIE at 0x%x referenced in module %s "
22932 "is neither DW_FORM_block* nor DW_FORM_exprloc"),
22933 to_underlying (sect_off), objfile_name (per_cu->objfile));
22935 retval.data = DW_BLOCK (attr)->data;
22936 retval.size = DW_BLOCK (attr)->size;
22938 retval.per_cu = cu->per_cu;
22940 age_cached_comp_units ();
22945 /* Like dwarf2_fetch_die_loc_sect_off, but take a CU
22948 struct dwarf2_locexpr_baton
22949 dwarf2_fetch_die_loc_cu_off (cu_offset offset_in_cu,
22950 struct dwarf2_per_cu_data *per_cu,
22951 CORE_ADDR (*get_frame_pc) (void *baton),
22954 sect_offset sect_off = per_cu->sect_off + to_underlying (offset_in_cu);
22956 return dwarf2_fetch_die_loc_sect_off (sect_off, per_cu, get_frame_pc, baton);
22959 /* Write a constant of a given type as target-ordered bytes into
22962 static const gdb_byte *
22963 write_constant_as_bytes (struct obstack *obstack,
22964 enum bfd_endian byte_order,
22971 *len = TYPE_LENGTH (type);
22972 result = (gdb_byte *) obstack_alloc (obstack, *len);
22973 store_unsigned_integer (result, *len, byte_order, value);
22978 /* If the DIE at OFFSET in PER_CU has a DW_AT_const_value, return a
22979 pointer to the constant bytes and set LEN to the length of the
22980 data. If memory is needed, allocate it on OBSTACK. If the DIE
22981 does not have a DW_AT_const_value, return NULL. */
22984 dwarf2_fetch_constant_bytes (sect_offset sect_off,
22985 struct dwarf2_per_cu_data *per_cu,
22986 struct obstack *obstack,
22989 struct dwarf2_cu *cu;
22990 struct die_info *die;
22991 struct attribute *attr;
22992 const gdb_byte *result = NULL;
22995 enum bfd_endian byte_order;
22997 dw2_setup (per_cu->objfile);
22999 if (per_cu->cu == NULL)
23004 /* We shouldn't get here for a dummy CU, but don't crash on the user.
23005 Instead just throw an error, not much else we can do. */
23006 error (_("Dwarf Error: Dummy CU at 0x%x referenced in module %s"),
23007 to_underlying (sect_off), objfile_name (per_cu->objfile));
23010 die = follow_die_offset (sect_off, per_cu->is_dwz, &cu);
23012 error (_("Dwarf Error: Cannot find DIE at 0x%x referenced in module %s"),
23013 to_underlying (sect_off), objfile_name (per_cu->objfile));
23016 attr = dwarf2_attr (die, DW_AT_const_value, cu);
23020 byte_order = (bfd_big_endian (per_cu->objfile->obfd)
23021 ? BFD_ENDIAN_BIG : BFD_ENDIAN_LITTLE);
23023 switch (attr->form)
23026 case DW_FORM_GNU_addr_index:
23030 *len = cu->header.addr_size;
23031 tem = (gdb_byte *) obstack_alloc (obstack, *len);
23032 store_unsigned_integer (tem, *len, byte_order, DW_ADDR (attr));
23036 case DW_FORM_string:
23038 case DW_FORM_GNU_str_index:
23039 case DW_FORM_GNU_strp_alt:
23040 /* DW_STRING is already allocated on the objfile obstack, point
23042 result = (const gdb_byte *) DW_STRING (attr);
23043 *len = strlen (DW_STRING (attr));
23045 case DW_FORM_block1:
23046 case DW_FORM_block2:
23047 case DW_FORM_block4:
23048 case DW_FORM_block:
23049 case DW_FORM_exprloc:
23050 case DW_FORM_data16:
23051 result = DW_BLOCK (attr)->data;
23052 *len = DW_BLOCK (attr)->size;
23055 /* The DW_AT_const_value attributes are supposed to carry the
23056 symbol's value "represented as it would be on the target
23057 architecture." By the time we get here, it's already been
23058 converted to host endianness, so we just need to sign- or
23059 zero-extend it as appropriate. */
23060 case DW_FORM_data1:
23061 type = die_type (die, cu);
23062 result = dwarf2_const_value_data (attr, obstack, cu, &value, 8);
23063 if (result == NULL)
23064 result = write_constant_as_bytes (obstack, byte_order,
23067 case DW_FORM_data2:
23068 type = die_type (die, cu);
23069 result = dwarf2_const_value_data (attr, obstack, cu, &value, 16);
23070 if (result == NULL)
23071 result = write_constant_as_bytes (obstack, byte_order,
23074 case DW_FORM_data4:
23075 type = die_type (die, cu);
23076 result = dwarf2_const_value_data (attr, obstack, cu, &value, 32);
23077 if (result == NULL)
23078 result = write_constant_as_bytes (obstack, byte_order,
23081 case DW_FORM_data8:
23082 type = die_type (die, cu);
23083 result = dwarf2_const_value_data (attr, obstack, cu, &value, 64);
23084 if (result == NULL)
23085 result = write_constant_as_bytes (obstack, byte_order,
23089 case DW_FORM_sdata:
23090 case DW_FORM_implicit_const:
23091 type = die_type (die, cu);
23092 result = write_constant_as_bytes (obstack, byte_order,
23093 type, DW_SND (attr), len);
23096 case DW_FORM_udata:
23097 type = die_type (die, cu);
23098 result = write_constant_as_bytes (obstack, byte_order,
23099 type, DW_UNSND (attr), len);
23103 complaint (&symfile_complaints,
23104 _("unsupported const value attribute form: '%s'"),
23105 dwarf_form_name (attr->form));
23112 /* Return the type of the die at OFFSET in PER_CU. Return NULL if no
23113 valid type for this die is found. */
23116 dwarf2_fetch_die_type_sect_off (sect_offset sect_off,
23117 struct dwarf2_per_cu_data *per_cu)
23119 struct dwarf2_cu *cu;
23120 struct die_info *die;
23122 dw2_setup (per_cu->objfile);
23124 if (per_cu->cu == NULL)
23130 die = follow_die_offset (sect_off, per_cu->is_dwz, &cu);
23134 return die_type (die, cu);
23137 /* Return the type of the DIE at DIE_OFFSET in the CU named by
23141 dwarf2_get_die_type (cu_offset die_offset,
23142 struct dwarf2_per_cu_data *per_cu)
23144 dw2_setup (per_cu->objfile);
23146 sect_offset die_offset_sect = per_cu->sect_off + to_underlying (die_offset);
23147 return get_die_type_at_offset (die_offset_sect, per_cu);
23150 /* Follow type unit SIG_TYPE referenced by SRC_DIE.
23151 On entry *REF_CU is the CU of SRC_DIE.
23152 On exit *REF_CU is the CU of the result.
23153 Returns NULL if the referenced DIE isn't found. */
23155 static struct die_info *
23156 follow_die_sig_1 (struct die_info *src_die, struct signatured_type *sig_type,
23157 struct dwarf2_cu **ref_cu)
23159 struct die_info temp_die;
23160 struct dwarf2_cu *sig_cu;
23161 struct die_info *die;
23163 /* While it might be nice to assert sig_type->type == NULL here,
23164 we can get here for DW_AT_imported_declaration where we need
23165 the DIE not the type. */
23167 /* If necessary, add it to the queue and load its DIEs. */
23169 if (maybe_queue_comp_unit (*ref_cu, &sig_type->per_cu, language_minimal))
23170 read_signatured_type (sig_type);
23172 sig_cu = sig_type->per_cu.cu;
23173 gdb_assert (sig_cu != NULL);
23174 gdb_assert (to_underlying (sig_type->type_offset_in_section) != 0);
23175 temp_die.sect_off = sig_type->type_offset_in_section;
23176 die = (struct die_info *) htab_find_with_hash (sig_cu->die_hash, &temp_die,
23177 to_underlying (temp_die.sect_off));
23180 /* For .gdb_index version 7 keep track of included TUs.
23181 http://sourceware.org/bugzilla/show_bug.cgi?id=15021. */
23182 if (dwarf2_per_objfile->index_table != NULL
23183 && dwarf2_per_objfile->index_table->version <= 7)
23185 VEC_safe_push (dwarf2_per_cu_ptr,
23186 (*ref_cu)->per_cu->imported_symtabs,
23197 /* Follow signatured type referenced by ATTR in SRC_DIE.
23198 On entry *REF_CU is the CU of SRC_DIE.
23199 On exit *REF_CU is the CU of the result.
23200 The result is the DIE of the type.
23201 If the referenced type cannot be found an error is thrown. */
23203 static struct die_info *
23204 follow_die_sig (struct die_info *src_die, const struct attribute *attr,
23205 struct dwarf2_cu **ref_cu)
23207 ULONGEST signature = DW_SIGNATURE (attr);
23208 struct signatured_type *sig_type;
23209 struct die_info *die;
23211 gdb_assert (attr->form == DW_FORM_ref_sig8);
23213 sig_type = lookup_signatured_type (*ref_cu, signature);
23214 /* sig_type will be NULL if the signatured type is missing from
23216 if (sig_type == NULL)
23218 error (_("Dwarf Error: Cannot find signatured DIE %s referenced"
23219 " from DIE at 0x%x [in module %s]"),
23220 hex_string (signature), to_underlying (src_die->sect_off),
23221 objfile_name ((*ref_cu)->objfile));
23224 die = follow_die_sig_1 (src_die, sig_type, ref_cu);
23227 dump_die_for_error (src_die);
23228 error (_("Dwarf Error: Problem reading signatured DIE %s referenced"
23229 " from DIE at 0x%x [in module %s]"),
23230 hex_string (signature), to_underlying (src_die->sect_off),
23231 objfile_name ((*ref_cu)->objfile));
23237 /* Get the type specified by SIGNATURE referenced in DIE/CU,
23238 reading in and processing the type unit if necessary. */
23240 static struct type *
23241 get_signatured_type (struct die_info *die, ULONGEST signature,
23242 struct dwarf2_cu *cu)
23244 struct signatured_type *sig_type;
23245 struct dwarf2_cu *type_cu;
23246 struct die_info *type_die;
23249 sig_type = lookup_signatured_type (cu, signature);
23250 /* sig_type will be NULL if the signatured type is missing from
23252 if (sig_type == NULL)
23254 complaint (&symfile_complaints,
23255 _("Dwarf Error: Cannot find signatured DIE %s referenced"
23256 " from DIE at 0x%x [in module %s]"),
23257 hex_string (signature), to_underlying (die->sect_off),
23258 objfile_name (dwarf2_per_objfile->objfile));
23259 return build_error_marker_type (cu, die);
23262 /* If we already know the type we're done. */
23263 if (sig_type->type != NULL)
23264 return sig_type->type;
23267 type_die = follow_die_sig_1 (die, sig_type, &type_cu);
23268 if (type_die != NULL)
23270 /* N.B. We need to call get_die_type to ensure only one type for this DIE
23271 is created. This is important, for example, because for c++ classes
23272 we need TYPE_NAME set which is only done by new_symbol. Blech. */
23273 type = read_type_die (type_die, type_cu);
23276 complaint (&symfile_complaints,
23277 _("Dwarf Error: Cannot build signatured type %s"
23278 " referenced from DIE at 0x%x [in module %s]"),
23279 hex_string (signature), to_underlying (die->sect_off),
23280 objfile_name (dwarf2_per_objfile->objfile));
23281 type = build_error_marker_type (cu, die);
23286 complaint (&symfile_complaints,
23287 _("Dwarf Error: Problem reading signatured DIE %s referenced"
23288 " from DIE at 0x%x [in module %s]"),
23289 hex_string (signature), to_underlying (die->sect_off),
23290 objfile_name (dwarf2_per_objfile->objfile));
23291 type = build_error_marker_type (cu, die);
23293 sig_type->type = type;
23298 /* Get the type specified by the DW_AT_signature ATTR in DIE/CU,
23299 reading in and processing the type unit if necessary. */
23301 static struct type *
23302 get_DW_AT_signature_type (struct die_info *die, const struct attribute *attr,
23303 struct dwarf2_cu *cu) /* ARI: editCase function */
23305 /* Yes, DW_AT_signature can use a non-ref_sig8 reference. */
23306 if (attr_form_is_ref (attr))
23308 struct dwarf2_cu *type_cu = cu;
23309 struct die_info *type_die = follow_die_ref (die, attr, &type_cu);
23311 return read_type_die (type_die, type_cu);
23313 else if (attr->form == DW_FORM_ref_sig8)
23315 return get_signatured_type (die, DW_SIGNATURE (attr), cu);
23319 complaint (&symfile_complaints,
23320 _("Dwarf Error: DW_AT_signature has bad form %s in DIE"
23321 " at 0x%x [in module %s]"),
23322 dwarf_form_name (attr->form), to_underlying (die->sect_off),
23323 objfile_name (dwarf2_per_objfile->objfile));
23324 return build_error_marker_type (cu, die);
23328 /* Load the DIEs associated with type unit PER_CU into memory. */
23331 load_full_type_unit (struct dwarf2_per_cu_data *per_cu)
23333 struct signatured_type *sig_type;
23335 /* Caller is responsible for ensuring type_unit_groups don't get here. */
23336 gdb_assert (! IS_TYPE_UNIT_GROUP (per_cu));
23338 /* We have the per_cu, but we need the signatured_type.
23339 Fortunately this is an easy translation. */
23340 gdb_assert (per_cu->is_debug_types);
23341 sig_type = (struct signatured_type *) per_cu;
23343 gdb_assert (per_cu->cu == NULL);
23345 read_signatured_type (sig_type);
23347 gdb_assert (per_cu->cu != NULL);
23350 /* die_reader_func for read_signatured_type.
23351 This is identical to load_full_comp_unit_reader,
23352 but is kept separate for now. */
23355 read_signatured_type_reader (const struct die_reader_specs *reader,
23356 const gdb_byte *info_ptr,
23357 struct die_info *comp_unit_die,
23361 struct dwarf2_cu *cu = reader->cu;
23363 gdb_assert (cu->die_hash == NULL);
23365 htab_create_alloc_ex (cu->header.length / 12,
23369 &cu->comp_unit_obstack,
23370 hashtab_obstack_allocate,
23371 dummy_obstack_deallocate);
23374 comp_unit_die->child = read_die_and_siblings (reader, info_ptr,
23375 &info_ptr, comp_unit_die);
23376 cu->dies = comp_unit_die;
23377 /* comp_unit_die is not stored in die_hash, no need. */
23379 /* We try not to read any attributes in this function, because not
23380 all CUs needed for references have been loaded yet, and symbol
23381 table processing isn't initialized. But we have to set the CU language,
23382 or we won't be able to build types correctly.
23383 Similarly, if we do not read the producer, we can not apply
23384 producer-specific interpretation. */
23385 prepare_one_comp_unit (cu, cu->dies, language_minimal);
23388 /* Read in a signatured type and build its CU and DIEs.
23389 If the type is a stub for the real type in a DWO file,
23390 read in the real type from the DWO file as well. */
23393 read_signatured_type (struct signatured_type *sig_type)
23395 struct dwarf2_per_cu_data *per_cu = &sig_type->per_cu;
23397 gdb_assert (per_cu->is_debug_types);
23398 gdb_assert (per_cu->cu == NULL);
23400 init_cutu_and_read_dies (per_cu, NULL, 0, 1,
23401 read_signatured_type_reader, NULL);
23402 sig_type->per_cu.tu_read = 1;
23405 /* Decode simple location descriptions.
23406 Given a pointer to a dwarf block that defines a location, compute
23407 the location and return the value.
23409 NOTE drow/2003-11-18: This function is called in two situations
23410 now: for the address of static or global variables (partial symbols
23411 only) and for offsets into structures which are expected to be
23412 (more or less) constant. The partial symbol case should go away,
23413 and only the constant case should remain. That will let this
23414 function complain more accurately. A few special modes are allowed
23415 without complaint for global variables (for instance, global
23416 register values and thread-local values).
23418 A location description containing no operations indicates that the
23419 object is optimized out. The return value is 0 for that case.
23420 FIXME drow/2003-11-16: No callers check for this case any more; soon all
23421 callers will only want a very basic result and this can become a
23424 Note that stack[0] is unused except as a default error return. */
23427 decode_locdesc (struct dwarf_block *blk, struct dwarf2_cu *cu)
23429 struct objfile *objfile = cu->objfile;
23431 size_t size = blk->size;
23432 const gdb_byte *data = blk->data;
23433 CORE_ADDR stack[64];
23435 unsigned int bytes_read, unsnd;
23441 stack[++stacki] = 0;
23480 stack[++stacki] = op - DW_OP_lit0;
23515 stack[++stacki] = op - DW_OP_reg0;
23517 dwarf2_complex_location_expr_complaint ();
23521 unsnd = read_unsigned_leb128 (NULL, (data + i), &bytes_read);
23523 stack[++stacki] = unsnd;
23525 dwarf2_complex_location_expr_complaint ();
23529 stack[++stacki] = read_address (objfile->obfd, &data[i],
23534 case DW_OP_const1u:
23535 stack[++stacki] = read_1_byte (objfile->obfd, &data[i]);
23539 case DW_OP_const1s:
23540 stack[++stacki] = read_1_signed_byte (objfile->obfd, &data[i]);
23544 case DW_OP_const2u:
23545 stack[++stacki] = read_2_bytes (objfile->obfd, &data[i]);
23549 case DW_OP_const2s:
23550 stack[++stacki] = read_2_signed_bytes (objfile->obfd, &data[i]);
23554 case DW_OP_const4u:
23555 stack[++stacki] = read_4_bytes (objfile->obfd, &data[i]);
23559 case DW_OP_const4s:
23560 stack[++stacki] = read_4_signed_bytes (objfile->obfd, &data[i]);
23564 case DW_OP_const8u:
23565 stack[++stacki] = read_8_bytes (objfile->obfd, &data[i]);
23570 stack[++stacki] = read_unsigned_leb128 (NULL, (data + i),
23576 stack[++stacki] = read_signed_leb128 (NULL, (data + i), &bytes_read);
23581 stack[stacki + 1] = stack[stacki];
23586 stack[stacki - 1] += stack[stacki];
23590 case DW_OP_plus_uconst:
23591 stack[stacki] += read_unsigned_leb128 (NULL, (data + i),
23597 stack[stacki - 1] -= stack[stacki];
23602 /* If we're not the last op, then we definitely can't encode
23603 this using GDB's address_class enum. This is valid for partial
23604 global symbols, although the variable's address will be bogus
23607 dwarf2_complex_location_expr_complaint ();
23610 case DW_OP_GNU_push_tls_address:
23611 case DW_OP_form_tls_address:
23612 /* The top of the stack has the offset from the beginning
23613 of the thread control block at which the variable is located. */
23614 /* Nothing should follow this operator, so the top of stack would
23616 /* This is valid for partial global symbols, but the variable's
23617 address will be bogus in the psymtab. Make it always at least
23618 non-zero to not look as a variable garbage collected by linker
23619 which have DW_OP_addr 0. */
23621 dwarf2_complex_location_expr_complaint ();
23625 case DW_OP_GNU_uninit:
23628 case DW_OP_GNU_addr_index:
23629 case DW_OP_GNU_const_index:
23630 stack[++stacki] = read_addr_index_from_leb128 (cu, &data[i],
23637 const char *name = get_DW_OP_name (op);
23640 complaint (&symfile_complaints, _("unsupported stack op: '%s'"),
23643 complaint (&symfile_complaints, _("unsupported stack op: '%02x'"),
23647 return (stack[stacki]);
23650 /* Enforce maximum stack depth of SIZE-1 to avoid writing
23651 outside of the allocated space. Also enforce minimum>0. */
23652 if (stacki >= ARRAY_SIZE (stack) - 1)
23654 complaint (&symfile_complaints,
23655 _("location description stack overflow"));
23661 complaint (&symfile_complaints,
23662 _("location description stack underflow"));
23666 return (stack[stacki]);
23669 /* memory allocation interface */
23671 static struct dwarf_block *
23672 dwarf_alloc_block (struct dwarf2_cu *cu)
23674 return XOBNEW (&cu->comp_unit_obstack, struct dwarf_block);
23677 static struct die_info *
23678 dwarf_alloc_die (struct dwarf2_cu *cu, int num_attrs)
23680 struct die_info *die;
23681 size_t size = sizeof (struct die_info);
23684 size += (num_attrs - 1) * sizeof (struct attribute);
23686 die = (struct die_info *) obstack_alloc (&cu->comp_unit_obstack, size);
23687 memset (die, 0, sizeof (struct die_info));
23692 /* Macro support. */
23694 /* Return file name relative to the compilation directory of file number I in
23695 *LH's file name table. The result is allocated using xmalloc; the caller is
23696 responsible for freeing it. */
23699 file_file_name (int file, struct line_header *lh)
23701 /* Is the file number a valid index into the line header's file name
23702 table? Remember that file numbers start with one, not zero. */
23703 if (1 <= file && file <= lh->file_names.size ())
23705 const file_entry &fe = lh->file_names[file - 1];
23707 if (!IS_ABSOLUTE_PATH (fe.name))
23709 const char *dir = fe.include_dir (lh);
23711 return concat (dir, SLASH_STRING, fe.name, (char *) NULL);
23713 return xstrdup (fe.name);
23717 /* The compiler produced a bogus file number. We can at least
23718 record the macro definitions made in the file, even if we
23719 won't be able to find the file by name. */
23720 char fake_name[80];
23722 xsnprintf (fake_name, sizeof (fake_name),
23723 "<bad macro file number %d>", file);
23725 complaint (&symfile_complaints,
23726 _("bad file number in macro information (%d)"),
23729 return xstrdup (fake_name);
23733 /* Return the full name of file number I in *LH's file name table.
23734 Use COMP_DIR as the name of the current directory of the
23735 compilation. The result is allocated using xmalloc; the caller is
23736 responsible for freeing it. */
23738 file_full_name (int file, struct line_header *lh, const char *comp_dir)
23740 /* Is the file number a valid index into the line header's file name
23741 table? Remember that file numbers start with one, not zero. */
23742 if (1 <= file && file <= lh->file_names.size ())
23744 char *relative = file_file_name (file, lh);
23746 if (IS_ABSOLUTE_PATH (relative) || comp_dir == NULL)
23748 return reconcat (relative, comp_dir, SLASH_STRING,
23749 relative, (char *) NULL);
23752 return file_file_name (file, lh);
23756 static struct macro_source_file *
23757 macro_start_file (int file, int line,
23758 struct macro_source_file *current_file,
23759 struct line_header *lh)
23761 /* File name relative to the compilation directory of this source file. */
23762 char *file_name = file_file_name (file, lh);
23764 if (! current_file)
23766 /* Note: We don't create a macro table for this compilation unit
23767 at all until we actually get a filename. */
23768 struct macro_table *macro_table = get_macro_table ();
23770 /* If we have no current file, then this must be the start_file
23771 directive for the compilation unit's main source file. */
23772 current_file = macro_set_main (macro_table, file_name);
23773 macro_define_special (macro_table);
23776 current_file = macro_include (current_file, line, file_name);
23780 return current_file;
23783 static const char *
23784 consume_improper_spaces (const char *p, const char *body)
23788 complaint (&symfile_complaints,
23789 _("macro definition contains spaces "
23790 "in formal argument list:\n`%s'"),
23802 parse_macro_definition (struct macro_source_file *file, int line,
23807 /* The body string takes one of two forms. For object-like macro
23808 definitions, it should be:
23810 <macro name> " " <definition>
23812 For function-like macro definitions, it should be:
23814 <macro name> "() " <definition>
23816 <macro name> "(" <arg name> ( "," <arg name> ) * ") " <definition>
23818 Spaces may appear only where explicitly indicated, and in the
23821 The Dwarf 2 spec says that an object-like macro's name is always
23822 followed by a space, but versions of GCC around March 2002 omit
23823 the space when the macro's definition is the empty string.
23825 The Dwarf 2 spec says that there should be no spaces between the
23826 formal arguments in a function-like macro's formal argument list,
23827 but versions of GCC around March 2002 include spaces after the
23831 /* Find the extent of the macro name. The macro name is terminated
23832 by either a space or null character (for an object-like macro) or
23833 an opening paren (for a function-like macro). */
23834 for (p = body; *p; p++)
23835 if (*p == ' ' || *p == '(')
23838 if (*p == ' ' || *p == '\0')
23840 /* It's an object-like macro. */
23841 int name_len = p - body;
23842 char *name = savestring (body, name_len);
23843 const char *replacement;
23846 replacement = body + name_len + 1;
23849 dwarf2_macro_malformed_definition_complaint (body);
23850 replacement = body + name_len;
23853 macro_define_object (file, line, name, replacement);
23857 else if (*p == '(')
23859 /* It's a function-like macro. */
23860 char *name = savestring (body, p - body);
23863 char **argv = XNEWVEC (char *, argv_size);
23867 p = consume_improper_spaces (p, body);
23869 /* Parse the formal argument list. */
23870 while (*p && *p != ')')
23872 /* Find the extent of the current argument name. */
23873 const char *arg_start = p;
23875 while (*p && *p != ',' && *p != ')' && *p != ' ')
23878 if (! *p || p == arg_start)
23879 dwarf2_macro_malformed_definition_complaint (body);
23882 /* Make sure argv has room for the new argument. */
23883 if (argc >= argv_size)
23886 argv = XRESIZEVEC (char *, argv, argv_size);
23889 argv[argc++] = savestring (arg_start, p - arg_start);
23892 p = consume_improper_spaces (p, body);
23894 /* Consume the comma, if present. */
23899 p = consume_improper_spaces (p, body);
23908 /* Perfectly formed definition, no complaints. */
23909 macro_define_function (file, line, name,
23910 argc, (const char **) argv,
23912 else if (*p == '\0')
23914 /* Complain, but do define it. */
23915 dwarf2_macro_malformed_definition_complaint (body);
23916 macro_define_function (file, line, name,
23917 argc, (const char **) argv,
23921 /* Just complain. */
23922 dwarf2_macro_malformed_definition_complaint (body);
23925 /* Just complain. */
23926 dwarf2_macro_malformed_definition_complaint (body);
23932 for (i = 0; i < argc; i++)
23938 dwarf2_macro_malformed_definition_complaint (body);
23941 /* Skip some bytes from BYTES according to the form given in FORM.
23942 Returns the new pointer. */
23944 static const gdb_byte *
23945 skip_form_bytes (bfd *abfd, const gdb_byte *bytes, const gdb_byte *buffer_end,
23946 enum dwarf_form form,
23947 unsigned int offset_size,
23948 struct dwarf2_section_info *section)
23950 unsigned int bytes_read;
23954 case DW_FORM_data1:
23959 case DW_FORM_data2:
23963 case DW_FORM_data4:
23967 case DW_FORM_data8:
23971 case DW_FORM_data16:
23975 case DW_FORM_string:
23976 read_direct_string (abfd, bytes, &bytes_read);
23977 bytes += bytes_read;
23980 case DW_FORM_sec_offset:
23982 case DW_FORM_GNU_strp_alt:
23983 bytes += offset_size;
23986 case DW_FORM_block:
23987 bytes += read_unsigned_leb128 (abfd, bytes, &bytes_read);
23988 bytes += bytes_read;
23991 case DW_FORM_block1:
23992 bytes += 1 + read_1_byte (abfd, bytes);
23994 case DW_FORM_block2:
23995 bytes += 2 + read_2_bytes (abfd, bytes);
23997 case DW_FORM_block4:
23998 bytes += 4 + read_4_bytes (abfd, bytes);
24001 case DW_FORM_sdata:
24002 case DW_FORM_udata:
24003 case DW_FORM_GNU_addr_index:
24004 case DW_FORM_GNU_str_index:
24005 bytes = gdb_skip_leb128 (bytes, buffer_end);
24008 dwarf2_section_buffer_overflow_complaint (section);
24013 case DW_FORM_implicit_const:
24018 complaint (&symfile_complaints,
24019 _("invalid form 0x%x in `%s'"),
24020 form, get_section_name (section));
24028 /* A helper for dwarf_decode_macros that handles skipping an unknown
24029 opcode. Returns an updated pointer to the macro data buffer; or,
24030 on error, issues a complaint and returns NULL. */
24032 static const gdb_byte *
24033 skip_unknown_opcode (unsigned int opcode,
24034 const gdb_byte **opcode_definitions,
24035 const gdb_byte *mac_ptr, const gdb_byte *mac_end,
24037 unsigned int offset_size,
24038 struct dwarf2_section_info *section)
24040 unsigned int bytes_read, i;
24042 const gdb_byte *defn;
24044 if (opcode_definitions[opcode] == NULL)
24046 complaint (&symfile_complaints,
24047 _("unrecognized DW_MACFINO opcode 0x%x"),
24052 defn = opcode_definitions[opcode];
24053 arg = read_unsigned_leb128 (abfd, defn, &bytes_read);
24054 defn += bytes_read;
24056 for (i = 0; i < arg; ++i)
24058 mac_ptr = skip_form_bytes (abfd, mac_ptr, mac_end,
24059 (enum dwarf_form) defn[i], offset_size,
24061 if (mac_ptr == NULL)
24063 /* skip_form_bytes already issued the complaint. */
24071 /* A helper function which parses the header of a macro section.
24072 If the macro section is the extended (for now called "GNU") type,
24073 then this updates *OFFSET_SIZE. Returns a pointer to just after
24074 the header, or issues a complaint and returns NULL on error. */
24076 static const gdb_byte *
24077 dwarf_parse_macro_header (const gdb_byte **opcode_definitions,
24079 const gdb_byte *mac_ptr,
24080 unsigned int *offset_size,
24081 int section_is_gnu)
24083 memset (opcode_definitions, 0, 256 * sizeof (gdb_byte *));
24085 if (section_is_gnu)
24087 unsigned int version, flags;
24089 version = read_2_bytes (abfd, mac_ptr);
24090 if (version != 4 && version != 5)
24092 complaint (&symfile_complaints,
24093 _("unrecognized version `%d' in .debug_macro section"),
24099 flags = read_1_byte (abfd, mac_ptr);
24101 *offset_size = (flags & 1) ? 8 : 4;
24103 if ((flags & 2) != 0)
24104 /* We don't need the line table offset. */
24105 mac_ptr += *offset_size;
24107 /* Vendor opcode descriptions. */
24108 if ((flags & 4) != 0)
24110 unsigned int i, count;
24112 count = read_1_byte (abfd, mac_ptr);
24114 for (i = 0; i < count; ++i)
24116 unsigned int opcode, bytes_read;
24119 opcode = read_1_byte (abfd, mac_ptr);
24121 opcode_definitions[opcode] = mac_ptr;
24122 arg = read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
24123 mac_ptr += bytes_read;
24132 /* A helper for dwarf_decode_macros that handles the GNU extensions,
24133 including DW_MACRO_import. */
24136 dwarf_decode_macro_bytes (bfd *abfd,
24137 const gdb_byte *mac_ptr, const gdb_byte *mac_end,
24138 struct macro_source_file *current_file,
24139 struct line_header *lh,
24140 struct dwarf2_section_info *section,
24141 int section_is_gnu, int section_is_dwz,
24142 unsigned int offset_size,
24143 htab_t include_hash)
24145 struct objfile *objfile = dwarf2_per_objfile->objfile;
24146 enum dwarf_macro_record_type macinfo_type;
24147 int at_commandline;
24148 const gdb_byte *opcode_definitions[256];
24150 mac_ptr = dwarf_parse_macro_header (opcode_definitions, abfd, mac_ptr,
24151 &offset_size, section_is_gnu);
24152 if (mac_ptr == NULL)
24154 /* We already issued a complaint. */
24158 /* Determines if GDB is still before first DW_MACINFO_start_file. If true
24159 GDB is still reading the definitions from command line. First
24160 DW_MACINFO_start_file will need to be ignored as it was already executed
24161 to create CURRENT_FILE for the main source holding also the command line
24162 definitions. On first met DW_MACINFO_start_file this flag is reset to
24163 normally execute all the remaining DW_MACINFO_start_file macinfos. */
24165 at_commandline = 1;
24169 /* Do we at least have room for a macinfo type byte? */
24170 if (mac_ptr >= mac_end)
24172 dwarf2_section_buffer_overflow_complaint (section);
24176 macinfo_type = (enum dwarf_macro_record_type) read_1_byte (abfd, mac_ptr);
24179 /* Note that we rely on the fact that the corresponding GNU and
24180 DWARF constants are the same. */
24181 switch (macinfo_type)
24183 /* A zero macinfo type indicates the end of the macro
24188 case DW_MACRO_define:
24189 case DW_MACRO_undef:
24190 case DW_MACRO_define_strp:
24191 case DW_MACRO_undef_strp:
24192 case DW_MACRO_define_sup:
24193 case DW_MACRO_undef_sup:
24195 unsigned int bytes_read;
24200 line = read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
24201 mac_ptr += bytes_read;
24203 if (macinfo_type == DW_MACRO_define
24204 || macinfo_type == DW_MACRO_undef)
24206 body = read_direct_string (abfd, mac_ptr, &bytes_read);
24207 mac_ptr += bytes_read;
24211 LONGEST str_offset;
24213 str_offset = read_offset_1 (abfd, mac_ptr, offset_size);
24214 mac_ptr += offset_size;
24216 if (macinfo_type == DW_MACRO_define_sup
24217 || macinfo_type == DW_MACRO_undef_sup
24220 struct dwz_file *dwz = dwarf2_get_dwz_file ();
24222 body = read_indirect_string_from_dwz (dwz, str_offset);
24225 body = read_indirect_string_at_offset (abfd, str_offset);
24228 is_define = (macinfo_type == DW_MACRO_define
24229 || macinfo_type == DW_MACRO_define_strp
24230 || macinfo_type == DW_MACRO_define_sup);
24231 if (! current_file)
24233 /* DWARF violation as no main source is present. */
24234 complaint (&symfile_complaints,
24235 _("debug info with no main source gives macro %s "
24237 is_define ? _("definition") : _("undefinition"),
24241 if ((line == 0 && !at_commandline)
24242 || (line != 0 && at_commandline))
24243 complaint (&symfile_complaints,
24244 _("debug info gives %s macro %s with %s line %d: %s"),
24245 at_commandline ? _("command-line") : _("in-file"),
24246 is_define ? _("definition") : _("undefinition"),
24247 line == 0 ? _("zero") : _("non-zero"), line, body);
24250 parse_macro_definition (current_file, line, body);
24253 gdb_assert (macinfo_type == DW_MACRO_undef
24254 || macinfo_type == DW_MACRO_undef_strp
24255 || macinfo_type == DW_MACRO_undef_sup);
24256 macro_undef (current_file, line, body);
24261 case DW_MACRO_start_file:
24263 unsigned int bytes_read;
24266 line = read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
24267 mac_ptr += bytes_read;
24268 file = read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
24269 mac_ptr += bytes_read;
24271 if ((line == 0 && !at_commandline)
24272 || (line != 0 && at_commandline))
24273 complaint (&symfile_complaints,
24274 _("debug info gives source %d included "
24275 "from %s at %s line %d"),
24276 file, at_commandline ? _("command-line") : _("file"),
24277 line == 0 ? _("zero") : _("non-zero"), line);
24279 if (at_commandline)
24281 /* This DW_MACRO_start_file was executed in the
24283 at_commandline = 0;
24286 current_file = macro_start_file (file, line, current_file, lh);
24290 case DW_MACRO_end_file:
24291 if (! current_file)
24292 complaint (&symfile_complaints,
24293 _("macro debug info has an unmatched "
24294 "`close_file' directive"));
24297 current_file = current_file->included_by;
24298 if (! current_file)
24300 enum dwarf_macro_record_type next_type;
24302 /* GCC circa March 2002 doesn't produce the zero
24303 type byte marking the end of the compilation
24304 unit. Complain if it's not there, but exit no
24307 /* Do we at least have room for a macinfo type byte? */
24308 if (mac_ptr >= mac_end)
24310 dwarf2_section_buffer_overflow_complaint (section);
24314 /* We don't increment mac_ptr here, so this is just
24317 = (enum dwarf_macro_record_type) read_1_byte (abfd,
24319 if (next_type != 0)
24320 complaint (&symfile_complaints,
24321 _("no terminating 0-type entry for "
24322 "macros in `.debug_macinfo' section"));
24329 case DW_MACRO_import:
24330 case DW_MACRO_import_sup:
24334 bfd *include_bfd = abfd;
24335 struct dwarf2_section_info *include_section = section;
24336 const gdb_byte *include_mac_end = mac_end;
24337 int is_dwz = section_is_dwz;
24338 const gdb_byte *new_mac_ptr;
24340 offset = read_offset_1 (abfd, mac_ptr, offset_size);
24341 mac_ptr += offset_size;
24343 if (macinfo_type == DW_MACRO_import_sup)
24345 struct dwz_file *dwz = dwarf2_get_dwz_file ();
24347 dwarf2_read_section (objfile, &dwz->macro);
24349 include_section = &dwz->macro;
24350 include_bfd = get_section_bfd_owner (include_section);
24351 include_mac_end = dwz->macro.buffer + dwz->macro.size;
24355 new_mac_ptr = include_section->buffer + offset;
24356 slot = htab_find_slot (include_hash, new_mac_ptr, INSERT);
24360 /* This has actually happened; see
24361 http://sourceware.org/bugzilla/show_bug.cgi?id=13568. */
24362 complaint (&symfile_complaints,
24363 _("recursive DW_MACRO_import in "
24364 ".debug_macro section"));
24368 *slot = (void *) new_mac_ptr;
24370 dwarf_decode_macro_bytes (include_bfd, new_mac_ptr,
24371 include_mac_end, current_file, lh,
24372 section, section_is_gnu, is_dwz,
24373 offset_size, include_hash);
24375 htab_remove_elt (include_hash, (void *) new_mac_ptr);
24380 case DW_MACINFO_vendor_ext:
24381 if (!section_is_gnu)
24383 unsigned int bytes_read;
24385 /* This reads the constant, but since we don't recognize
24386 any vendor extensions, we ignore it. */
24387 read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
24388 mac_ptr += bytes_read;
24389 read_direct_string (abfd, mac_ptr, &bytes_read);
24390 mac_ptr += bytes_read;
24392 /* We don't recognize any vendor extensions. */
24398 mac_ptr = skip_unknown_opcode (macinfo_type, opcode_definitions,
24399 mac_ptr, mac_end, abfd, offset_size,
24401 if (mac_ptr == NULL)
24405 } while (macinfo_type != 0);
24409 dwarf_decode_macros (struct dwarf2_cu *cu, unsigned int offset,
24410 int section_is_gnu)
24412 struct objfile *objfile = dwarf2_per_objfile->objfile;
24413 struct line_header *lh = cu->line_header;
24415 const gdb_byte *mac_ptr, *mac_end;
24416 struct macro_source_file *current_file = 0;
24417 enum dwarf_macro_record_type macinfo_type;
24418 unsigned int offset_size = cu->header.offset_size;
24419 const gdb_byte *opcode_definitions[256];
24421 struct dwarf2_section_info *section;
24422 const char *section_name;
24424 if (cu->dwo_unit != NULL)
24426 if (section_is_gnu)
24428 section = &cu->dwo_unit->dwo_file->sections.macro;
24429 section_name = ".debug_macro.dwo";
24433 section = &cu->dwo_unit->dwo_file->sections.macinfo;
24434 section_name = ".debug_macinfo.dwo";
24439 if (section_is_gnu)
24441 section = &dwarf2_per_objfile->macro;
24442 section_name = ".debug_macro";
24446 section = &dwarf2_per_objfile->macinfo;
24447 section_name = ".debug_macinfo";
24451 dwarf2_read_section (objfile, section);
24452 if (section->buffer == NULL)
24454 complaint (&symfile_complaints, _("missing %s section"), section_name);
24457 abfd = get_section_bfd_owner (section);
24459 /* First pass: Find the name of the base filename.
24460 This filename is needed in order to process all macros whose definition
24461 (or undefinition) comes from the command line. These macros are defined
24462 before the first DW_MACINFO_start_file entry, and yet still need to be
24463 associated to the base file.
24465 To determine the base file name, we scan the macro definitions until we
24466 reach the first DW_MACINFO_start_file entry. We then initialize
24467 CURRENT_FILE accordingly so that any macro definition found before the
24468 first DW_MACINFO_start_file can still be associated to the base file. */
24470 mac_ptr = section->buffer + offset;
24471 mac_end = section->buffer + section->size;
24473 mac_ptr = dwarf_parse_macro_header (opcode_definitions, abfd, mac_ptr,
24474 &offset_size, section_is_gnu);
24475 if (mac_ptr == NULL)
24477 /* We already issued a complaint. */
24483 /* Do we at least have room for a macinfo type byte? */
24484 if (mac_ptr >= mac_end)
24486 /* Complaint is printed during the second pass as GDB will probably
24487 stop the first pass earlier upon finding
24488 DW_MACINFO_start_file. */
24492 macinfo_type = (enum dwarf_macro_record_type) read_1_byte (abfd, mac_ptr);
24495 /* Note that we rely on the fact that the corresponding GNU and
24496 DWARF constants are the same. */
24497 switch (macinfo_type)
24499 /* A zero macinfo type indicates the end of the macro
24504 case DW_MACRO_define:
24505 case DW_MACRO_undef:
24506 /* Only skip the data by MAC_PTR. */
24508 unsigned int bytes_read;
24510 read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
24511 mac_ptr += bytes_read;
24512 read_direct_string (abfd, mac_ptr, &bytes_read);
24513 mac_ptr += bytes_read;
24517 case DW_MACRO_start_file:
24519 unsigned int bytes_read;
24522 line = read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
24523 mac_ptr += bytes_read;
24524 file = read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
24525 mac_ptr += bytes_read;
24527 current_file = macro_start_file (file, line, current_file, lh);
24531 case DW_MACRO_end_file:
24532 /* No data to skip by MAC_PTR. */
24535 case DW_MACRO_define_strp:
24536 case DW_MACRO_undef_strp:
24537 case DW_MACRO_define_sup:
24538 case DW_MACRO_undef_sup:
24540 unsigned int bytes_read;
24542 read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
24543 mac_ptr += bytes_read;
24544 mac_ptr += offset_size;
24548 case DW_MACRO_import:
24549 case DW_MACRO_import_sup:
24550 /* Note that, according to the spec, a transparent include
24551 chain cannot call DW_MACRO_start_file. So, we can just
24552 skip this opcode. */
24553 mac_ptr += offset_size;
24556 case DW_MACINFO_vendor_ext:
24557 /* Only skip the data by MAC_PTR. */
24558 if (!section_is_gnu)
24560 unsigned int bytes_read;
24562 read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
24563 mac_ptr += bytes_read;
24564 read_direct_string (abfd, mac_ptr, &bytes_read);
24565 mac_ptr += bytes_read;
24570 mac_ptr = skip_unknown_opcode (macinfo_type, opcode_definitions,
24571 mac_ptr, mac_end, abfd, offset_size,
24573 if (mac_ptr == NULL)
24577 } while (macinfo_type != 0 && current_file == NULL);
24579 /* Second pass: Process all entries.
24581 Use the AT_COMMAND_LINE flag to determine whether we are still processing
24582 command-line macro definitions/undefinitions. This flag is unset when we
24583 reach the first DW_MACINFO_start_file entry. */
24585 htab_up include_hash (htab_create_alloc (1, htab_hash_pointer,
24587 NULL, xcalloc, xfree));
24588 mac_ptr = section->buffer + offset;
24589 slot = htab_find_slot (include_hash.get (), mac_ptr, INSERT);
24590 *slot = (void *) mac_ptr;
24591 dwarf_decode_macro_bytes (abfd, mac_ptr, mac_end,
24592 current_file, lh, section,
24593 section_is_gnu, 0, offset_size,
24594 include_hash.get ());
24597 /* Check if the attribute's form is a DW_FORM_block*
24598 if so return true else false. */
24601 attr_form_is_block (const struct attribute *attr)
24603 return (attr == NULL ? 0 :
24604 attr->form == DW_FORM_block1
24605 || attr->form == DW_FORM_block2
24606 || attr->form == DW_FORM_block4
24607 || attr->form == DW_FORM_block
24608 || attr->form == DW_FORM_exprloc);
24611 /* Return non-zero if ATTR's value is a section offset --- classes
24612 lineptr, loclistptr, macptr or rangelistptr --- or zero, otherwise.
24613 You may use DW_UNSND (attr) to retrieve such offsets.
24615 Section 7.5.4, "Attribute Encodings", explains that no attribute
24616 may have a value that belongs to more than one of these classes; it
24617 would be ambiguous if we did, because we use the same forms for all
24621 attr_form_is_section_offset (const struct attribute *attr)
24623 return (attr->form == DW_FORM_data4
24624 || attr->form == DW_FORM_data8
24625 || attr->form == DW_FORM_sec_offset);
24628 /* Return non-zero if ATTR's value falls in the 'constant' class, or
24629 zero otherwise. When this function returns true, you can apply
24630 dwarf2_get_attr_constant_value to it.
24632 However, note that for some attributes you must check
24633 attr_form_is_section_offset before using this test. DW_FORM_data4
24634 and DW_FORM_data8 are members of both the constant class, and of
24635 the classes that contain offsets into other debug sections
24636 (lineptr, loclistptr, macptr or rangelistptr). The DWARF spec says
24637 that, if an attribute's can be either a constant or one of the
24638 section offset classes, DW_FORM_data4 and DW_FORM_data8 should be
24639 taken as section offsets, not constants.
24641 DW_FORM_data16 is not considered as dwarf2_get_attr_constant_value
24642 cannot handle that. */
24645 attr_form_is_constant (const struct attribute *attr)
24647 switch (attr->form)
24649 case DW_FORM_sdata:
24650 case DW_FORM_udata:
24651 case DW_FORM_data1:
24652 case DW_FORM_data2:
24653 case DW_FORM_data4:
24654 case DW_FORM_data8:
24655 case DW_FORM_implicit_const:
24663 /* DW_ADDR is always stored already as sect_offset; despite for the forms
24664 besides DW_FORM_ref_addr it is stored as cu_offset in the DWARF file. */
24667 attr_form_is_ref (const struct attribute *attr)
24669 switch (attr->form)
24671 case DW_FORM_ref_addr:
24676 case DW_FORM_ref_udata:
24677 case DW_FORM_GNU_ref_alt:
24684 /* Return the .debug_loc section to use for CU.
24685 For DWO files use .debug_loc.dwo. */
24687 static struct dwarf2_section_info *
24688 cu_debug_loc_section (struct dwarf2_cu *cu)
24692 struct dwo_sections *sections = &cu->dwo_unit->dwo_file->sections;
24694 return cu->header.version >= 5 ? §ions->loclists : §ions->loc;
24696 return (cu->header.version >= 5 ? &dwarf2_per_objfile->loclists
24697 : &dwarf2_per_objfile->loc);
24700 /* A helper function that fills in a dwarf2_loclist_baton. */
24703 fill_in_loclist_baton (struct dwarf2_cu *cu,
24704 struct dwarf2_loclist_baton *baton,
24705 const struct attribute *attr)
24707 struct dwarf2_section_info *section = cu_debug_loc_section (cu);
24709 dwarf2_read_section (dwarf2_per_objfile->objfile, section);
24711 baton->per_cu = cu->per_cu;
24712 gdb_assert (baton->per_cu);
24713 /* We don't know how long the location list is, but make sure we
24714 don't run off the edge of the section. */
24715 baton->size = section->size - DW_UNSND (attr);
24716 baton->data = section->buffer + DW_UNSND (attr);
24717 baton->base_address = cu->base_address;
24718 baton->from_dwo = cu->dwo_unit != NULL;
24722 dwarf2_symbol_mark_computed (const struct attribute *attr, struct symbol *sym,
24723 struct dwarf2_cu *cu, int is_block)
24725 struct objfile *objfile = dwarf2_per_objfile->objfile;
24726 struct dwarf2_section_info *section = cu_debug_loc_section (cu);
24728 if (attr_form_is_section_offset (attr)
24729 /* .debug_loc{,.dwo} may not exist at all, or the offset may be outside
24730 the section. If so, fall through to the complaint in the
24732 && DW_UNSND (attr) < dwarf2_section_size (objfile, section))
24734 struct dwarf2_loclist_baton *baton;
24736 baton = XOBNEW (&objfile->objfile_obstack, struct dwarf2_loclist_baton);
24738 fill_in_loclist_baton (cu, baton, attr);
24740 if (cu->base_known == 0)
24741 complaint (&symfile_complaints,
24742 _("Location list used without "
24743 "specifying the CU base address."));
24745 SYMBOL_ACLASS_INDEX (sym) = (is_block
24746 ? dwarf2_loclist_block_index
24747 : dwarf2_loclist_index);
24748 SYMBOL_LOCATION_BATON (sym) = baton;
24752 struct dwarf2_locexpr_baton *baton;
24754 baton = XOBNEW (&objfile->objfile_obstack, struct dwarf2_locexpr_baton);
24755 baton->per_cu = cu->per_cu;
24756 gdb_assert (baton->per_cu);
24758 if (attr_form_is_block (attr))
24760 /* Note that we're just copying the block's data pointer
24761 here, not the actual data. We're still pointing into the
24762 info_buffer for SYM's objfile; right now we never release
24763 that buffer, but when we do clean up properly this may
24765 baton->size = DW_BLOCK (attr)->size;
24766 baton->data = DW_BLOCK (attr)->data;
24770 dwarf2_invalid_attrib_class_complaint ("location description",
24771 SYMBOL_NATURAL_NAME (sym));
24775 SYMBOL_ACLASS_INDEX (sym) = (is_block
24776 ? dwarf2_locexpr_block_index
24777 : dwarf2_locexpr_index);
24778 SYMBOL_LOCATION_BATON (sym) = baton;
24782 /* Return the OBJFILE associated with the compilation unit CU. If CU
24783 came from a separate debuginfo file, then the master objfile is
24787 dwarf2_per_cu_objfile (struct dwarf2_per_cu_data *per_cu)
24789 struct objfile *objfile = per_cu->objfile;
24791 /* Return the master objfile, so that we can report and look up the
24792 correct file containing this variable. */
24793 if (objfile->separate_debug_objfile_backlink)
24794 objfile = objfile->separate_debug_objfile_backlink;
24799 /* Return comp_unit_head for PER_CU, either already available in PER_CU->CU
24800 (CU_HEADERP is unused in such case) or prepare a temporary copy at
24801 CU_HEADERP first. */
24803 static const struct comp_unit_head *
24804 per_cu_header_read_in (struct comp_unit_head *cu_headerp,
24805 struct dwarf2_per_cu_data *per_cu)
24807 const gdb_byte *info_ptr;
24810 return &per_cu->cu->header;
24812 info_ptr = per_cu->section->buffer + to_underlying (per_cu->sect_off);
24814 memset (cu_headerp, 0, sizeof (*cu_headerp));
24815 read_comp_unit_head (cu_headerp, info_ptr, per_cu->section,
24816 rcuh_kind::COMPILE);
24821 /* Return the address size given in the compilation unit header for CU. */
24824 dwarf2_per_cu_addr_size (struct dwarf2_per_cu_data *per_cu)
24826 struct comp_unit_head cu_header_local;
24827 const struct comp_unit_head *cu_headerp;
24829 cu_headerp = per_cu_header_read_in (&cu_header_local, per_cu);
24831 return cu_headerp->addr_size;
24834 /* Return the offset size given in the compilation unit header for CU. */
24837 dwarf2_per_cu_offset_size (struct dwarf2_per_cu_data *per_cu)
24839 struct comp_unit_head cu_header_local;
24840 const struct comp_unit_head *cu_headerp;
24842 cu_headerp = per_cu_header_read_in (&cu_header_local, per_cu);
24844 return cu_headerp->offset_size;
24847 /* See its dwarf2loc.h declaration. */
24850 dwarf2_per_cu_ref_addr_size (struct dwarf2_per_cu_data *per_cu)
24852 struct comp_unit_head cu_header_local;
24853 const struct comp_unit_head *cu_headerp;
24855 cu_headerp = per_cu_header_read_in (&cu_header_local, per_cu);
24857 if (cu_headerp->version == 2)
24858 return cu_headerp->addr_size;
24860 return cu_headerp->offset_size;
24863 /* Return the text offset of the CU. The returned offset comes from
24864 this CU's objfile. If this objfile came from a separate debuginfo
24865 file, then the offset may be different from the corresponding
24866 offset in the parent objfile. */
24869 dwarf2_per_cu_text_offset (struct dwarf2_per_cu_data *per_cu)
24871 struct objfile *objfile = per_cu->objfile;
24873 return ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
24876 /* Return DWARF version number of PER_CU. */
24879 dwarf2_version (struct dwarf2_per_cu_data *per_cu)
24881 return per_cu->dwarf_version;
24884 /* Locate the .debug_info compilation unit from CU's objfile which contains
24885 the DIE at OFFSET. Raises an error on failure. */
24887 static struct dwarf2_per_cu_data *
24888 dwarf2_find_containing_comp_unit (sect_offset sect_off,
24889 unsigned int offset_in_dwz,
24890 struct objfile *objfile)
24892 struct dwarf2_per_cu_data *this_cu;
24894 const sect_offset *cu_off;
24897 high = dwarf2_per_objfile->n_comp_units - 1;
24900 struct dwarf2_per_cu_data *mid_cu;
24901 int mid = low + (high - low) / 2;
24903 mid_cu = dwarf2_per_objfile->all_comp_units[mid];
24904 cu_off = &mid_cu->sect_off;
24905 if (mid_cu->is_dwz > offset_in_dwz
24906 || (mid_cu->is_dwz == offset_in_dwz && *cu_off >= sect_off))
24911 gdb_assert (low == high);
24912 this_cu = dwarf2_per_objfile->all_comp_units[low];
24913 cu_off = &this_cu->sect_off;
24914 if (this_cu->is_dwz != offset_in_dwz || *cu_off > sect_off)
24916 if (low == 0 || this_cu->is_dwz != offset_in_dwz)
24917 error (_("Dwarf Error: could not find partial DIE containing "
24918 "offset 0x%x [in module %s]"),
24919 to_underlying (sect_off), bfd_get_filename (objfile->obfd));
24921 gdb_assert (dwarf2_per_objfile->all_comp_units[low-1]->sect_off
24923 return dwarf2_per_objfile->all_comp_units[low-1];
24927 this_cu = dwarf2_per_objfile->all_comp_units[low];
24928 if (low == dwarf2_per_objfile->n_comp_units - 1
24929 && sect_off >= this_cu->sect_off + this_cu->length)
24930 error (_("invalid dwarf2 offset %u"), to_underlying (sect_off));
24931 gdb_assert (sect_off < this_cu->sect_off + this_cu->length);
24936 /* Initialize dwarf2_cu CU, owned by PER_CU. */
24939 init_one_comp_unit (struct dwarf2_cu *cu, struct dwarf2_per_cu_data *per_cu)
24941 memset (cu, 0, sizeof (*cu));
24943 cu->per_cu = per_cu;
24944 cu->objfile = per_cu->objfile;
24945 obstack_init (&cu->comp_unit_obstack);
24948 /* Initialize basic fields of dwarf_cu CU according to DIE COMP_UNIT_DIE. */
24951 prepare_one_comp_unit (struct dwarf2_cu *cu, struct die_info *comp_unit_die,
24952 enum language pretend_language)
24954 struct attribute *attr;
24956 /* Set the language we're debugging. */
24957 attr = dwarf2_attr (comp_unit_die, DW_AT_language, cu);
24959 set_cu_language (DW_UNSND (attr), cu);
24962 cu->language = pretend_language;
24963 cu->language_defn = language_def (cu->language);
24966 cu->producer = dwarf2_string_attr (comp_unit_die, DW_AT_producer, cu);
24969 /* Release one cached compilation unit, CU. We unlink it from the tree
24970 of compilation units, but we don't remove it from the read_in_chain;
24971 the caller is responsible for that.
24972 NOTE: DATA is a void * because this function is also used as a
24973 cleanup routine. */
24976 free_heap_comp_unit (void *data)
24978 struct dwarf2_cu *cu = (struct dwarf2_cu *) data;
24980 gdb_assert (cu->per_cu != NULL);
24981 cu->per_cu->cu = NULL;
24984 obstack_free (&cu->comp_unit_obstack, NULL);
24989 /* This cleanup function is passed the address of a dwarf2_cu on the stack
24990 when we're finished with it. We can't free the pointer itself, but be
24991 sure to unlink it from the cache. Also release any associated storage. */
24994 free_stack_comp_unit (void *data)
24996 struct dwarf2_cu *cu = (struct dwarf2_cu *) data;
24998 gdb_assert (cu->per_cu != NULL);
24999 cu->per_cu->cu = NULL;
25002 obstack_free (&cu->comp_unit_obstack, NULL);
25003 cu->partial_dies = NULL;
25006 /* Free all cached compilation units. */
25009 free_cached_comp_units (void *data)
25011 dwarf2_per_objfile->free_cached_comp_units ();
25014 /* Increase the age counter on each cached compilation unit, and free
25015 any that are too old. */
25018 age_cached_comp_units (void)
25020 struct dwarf2_per_cu_data *per_cu, **last_chain;
25022 dwarf2_clear_marks (dwarf2_per_objfile->read_in_chain);
25023 per_cu = dwarf2_per_objfile->read_in_chain;
25024 while (per_cu != NULL)
25026 per_cu->cu->last_used ++;
25027 if (per_cu->cu->last_used <= dwarf_max_cache_age)
25028 dwarf2_mark (per_cu->cu);
25029 per_cu = per_cu->cu->read_in_chain;
25032 per_cu = dwarf2_per_objfile->read_in_chain;
25033 last_chain = &dwarf2_per_objfile->read_in_chain;
25034 while (per_cu != NULL)
25036 struct dwarf2_per_cu_data *next_cu;
25038 next_cu = per_cu->cu->read_in_chain;
25040 if (!per_cu->cu->mark)
25042 free_heap_comp_unit (per_cu->cu);
25043 *last_chain = next_cu;
25046 last_chain = &per_cu->cu->read_in_chain;
25052 /* Remove a single compilation unit from the cache. */
25055 free_one_cached_comp_unit (struct dwarf2_per_cu_data *target_per_cu)
25057 struct dwarf2_per_cu_data *per_cu, **last_chain;
25059 per_cu = dwarf2_per_objfile->read_in_chain;
25060 last_chain = &dwarf2_per_objfile->read_in_chain;
25061 while (per_cu != NULL)
25063 struct dwarf2_per_cu_data *next_cu;
25065 next_cu = per_cu->cu->read_in_chain;
25067 if (per_cu == target_per_cu)
25069 free_heap_comp_unit (per_cu->cu);
25071 *last_chain = next_cu;
25075 last_chain = &per_cu->cu->read_in_chain;
25081 /* Release all extra memory associated with OBJFILE. */
25084 dwarf2_free_objfile (struct objfile *objfile)
25087 = (struct dwarf2_per_objfile *) objfile_data (objfile,
25088 dwarf2_objfile_data_key);
25090 if (dwarf2_per_objfile == NULL)
25093 dwarf2_per_objfile->~dwarf2_per_objfile ();
25096 /* A set of CU "per_cu" pointer, DIE offset, and GDB type pointer.
25097 We store these in a hash table separate from the DIEs, and preserve them
25098 when the DIEs are flushed out of cache.
25100 The CU "per_cu" pointer is needed because offset alone is not enough to
25101 uniquely identify the type. A file may have multiple .debug_types sections,
25102 or the type may come from a DWO file. Furthermore, while it's more logical
25103 to use per_cu->section+offset, with Fission the section with the data is in
25104 the DWO file but we don't know that section at the point we need it.
25105 We have to use something in dwarf2_per_cu_data (or the pointer to it)
25106 because we can enter the lookup routine, get_die_type_at_offset, from
25107 outside this file, and thus won't necessarily have PER_CU->cu.
25108 Fortunately, PER_CU is stable for the life of the objfile. */
25110 struct dwarf2_per_cu_offset_and_type
25112 const struct dwarf2_per_cu_data *per_cu;
25113 sect_offset sect_off;
25117 /* Hash function for a dwarf2_per_cu_offset_and_type. */
25120 per_cu_offset_and_type_hash (const void *item)
25122 const struct dwarf2_per_cu_offset_and_type *ofs
25123 = (const struct dwarf2_per_cu_offset_and_type *) item;
25125 return (uintptr_t) ofs->per_cu + to_underlying (ofs->sect_off);
25128 /* Equality function for a dwarf2_per_cu_offset_and_type. */
25131 per_cu_offset_and_type_eq (const void *item_lhs, const void *item_rhs)
25133 const struct dwarf2_per_cu_offset_and_type *ofs_lhs
25134 = (const struct dwarf2_per_cu_offset_and_type *) item_lhs;
25135 const struct dwarf2_per_cu_offset_and_type *ofs_rhs
25136 = (const struct dwarf2_per_cu_offset_and_type *) item_rhs;
25138 return (ofs_lhs->per_cu == ofs_rhs->per_cu
25139 && ofs_lhs->sect_off == ofs_rhs->sect_off);
25142 /* Set the type associated with DIE to TYPE. Save it in CU's hash
25143 table if necessary. For convenience, return TYPE.
25145 The DIEs reading must have careful ordering to:
25146 * Not cause infite loops trying to read in DIEs as a prerequisite for
25147 reading current DIE.
25148 * Not trying to dereference contents of still incompletely read in types
25149 while reading in other DIEs.
25150 * Enable referencing still incompletely read in types just by a pointer to
25151 the type without accessing its fields.
25153 Therefore caller should follow these rules:
25154 * Try to fetch any prerequisite types we may need to build this DIE type
25155 before building the type and calling set_die_type.
25156 * After building type call set_die_type for current DIE as soon as
25157 possible before fetching more types to complete the current type.
25158 * Make the type as complete as possible before fetching more types. */
25160 static struct type *
25161 set_die_type (struct die_info *die, struct type *type, struct dwarf2_cu *cu)
25163 struct dwarf2_per_cu_offset_and_type **slot, ofs;
25164 struct objfile *objfile = cu->objfile;
25165 struct attribute *attr;
25166 struct dynamic_prop prop;
25168 /* For Ada types, make sure that the gnat-specific data is always
25169 initialized (if not already set). There are a few types where
25170 we should not be doing so, because the type-specific area is
25171 already used to hold some other piece of info (eg: TYPE_CODE_FLT
25172 where the type-specific area is used to store the floatformat).
25173 But this is not a problem, because the gnat-specific information
25174 is actually not needed for these types. */
25175 if (need_gnat_info (cu)
25176 && TYPE_CODE (type) != TYPE_CODE_FUNC
25177 && TYPE_CODE (type) != TYPE_CODE_FLT
25178 && TYPE_CODE (type) != TYPE_CODE_METHODPTR
25179 && TYPE_CODE (type) != TYPE_CODE_MEMBERPTR
25180 && TYPE_CODE (type) != TYPE_CODE_METHOD
25181 && !HAVE_GNAT_AUX_INFO (type))
25182 INIT_GNAT_SPECIFIC (type);
25184 /* Read DW_AT_allocated and set in type. */
25185 attr = dwarf2_attr (die, DW_AT_allocated, cu);
25186 if (attr_form_is_block (attr))
25188 if (attr_to_dynamic_prop (attr, die, cu, &prop))
25189 add_dyn_prop (DYN_PROP_ALLOCATED, prop, type, objfile);
25191 else if (attr != NULL)
25193 complaint (&symfile_complaints,
25194 _("DW_AT_allocated has the wrong form (%s) at DIE 0x%x"),
25195 (attr != NULL ? dwarf_form_name (attr->form) : "n/a"),
25196 to_underlying (die->sect_off));
25199 /* Read DW_AT_associated and set in type. */
25200 attr = dwarf2_attr (die, DW_AT_associated, cu);
25201 if (attr_form_is_block (attr))
25203 if (attr_to_dynamic_prop (attr, die, cu, &prop))
25204 add_dyn_prop (DYN_PROP_ASSOCIATED, prop, type, objfile);
25206 else if (attr != NULL)
25208 complaint (&symfile_complaints,
25209 _("DW_AT_associated has the wrong form (%s) at DIE 0x%x"),
25210 (attr != NULL ? dwarf_form_name (attr->form) : "n/a"),
25211 to_underlying (die->sect_off));
25214 /* Read DW_AT_data_location and set in type. */
25215 attr = dwarf2_attr (die, DW_AT_data_location, cu);
25216 if (attr_to_dynamic_prop (attr, die, cu, &prop))
25217 add_dyn_prop (DYN_PROP_DATA_LOCATION, prop, type, objfile);
25219 if (dwarf2_per_objfile->die_type_hash == NULL)
25221 dwarf2_per_objfile->die_type_hash =
25222 htab_create_alloc_ex (127,
25223 per_cu_offset_and_type_hash,
25224 per_cu_offset_and_type_eq,
25226 &objfile->objfile_obstack,
25227 hashtab_obstack_allocate,
25228 dummy_obstack_deallocate);
25231 ofs.per_cu = cu->per_cu;
25232 ofs.sect_off = die->sect_off;
25234 slot = (struct dwarf2_per_cu_offset_and_type **)
25235 htab_find_slot (dwarf2_per_objfile->die_type_hash, &ofs, INSERT);
25237 complaint (&symfile_complaints,
25238 _("A problem internal to GDB: DIE 0x%x has type already set"),
25239 to_underlying (die->sect_off));
25240 *slot = XOBNEW (&objfile->objfile_obstack,
25241 struct dwarf2_per_cu_offset_and_type);
25246 /* Look up the type for the die at SECT_OFF in PER_CU in die_type_hash,
25247 or return NULL if the die does not have a saved type. */
25249 static struct type *
25250 get_die_type_at_offset (sect_offset sect_off,
25251 struct dwarf2_per_cu_data *per_cu)
25253 struct dwarf2_per_cu_offset_and_type *slot, ofs;
25255 if (dwarf2_per_objfile->die_type_hash == NULL)
25258 ofs.per_cu = per_cu;
25259 ofs.sect_off = sect_off;
25260 slot = ((struct dwarf2_per_cu_offset_and_type *)
25261 htab_find (dwarf2_per_objfile->die_type_hash, &ofs));
25268 /* Look up the type for DIE in CU in die_type_hash,
25269 or return NULL if DIE does not have a saved type. */
25271 static struct type *
25272 get_die_type (struct die_info *die, struct dwarf2_cu *cu)
25274 return get_die_type_at_offset (die->sect_off, cu->per_cu);
25277 /* Add a dependence relationship from CU to REF_PER_CU. */
25280 dwarf2_add_dependence (struct dwarf2_cu *cu,
25281 struct dwarf2_per_cu_data *ref_per_cu)
25285 if (cu->dependencies == NULL)
25287 = htab_create_alloc_ex (5, htab_hash_pointer, htab_eq_pointer,
25288 NULL, &cu->comp_unit_obstack,
25289 hashtab_obstack_allocate,
25290 dummy_obstack_deallocate);
25292 slot = htab_find_slot (cu->dependencies, ref_per_cu, INSERT);
25294 *slot = ref_per_cu;
25297 /* Subroutine of dwarf2_mark to pass to htab_traverse.
25298 Set the mark field in every compilation unit in the
25299 cache that we must keep because we are keeping CU. */
25302 dwarf2_mark_helper (void **slot, void *data)
25304 struct dwarf2_per_cu_data *per_cu;
25306 per_cu = (struct dwarf2_per_cu_data *) *slot;
25308 /* cu->dependencies references may not yet have been ever read if QUIT aborts
25309 reading of the chain. As such dependencies remain valid it is not much
25310 useful to track and undo them during QUIT cleanups. */
25311 if (per_cu->cu == NULL)
25314 if (per_cu->cu->mark)
25316 per_cu->cu->mark = 1;
25318 if (per_cu->cu->dependencies != NULL)
25319 htab_traverse (per_cu->cu->dependencies, dwarf2_mark_helper, NULL);
25324 /* Set the mark field in CU and in every other compilation unit in the
25325 cache that we must keep because we are keeping CU. */
25328 dwarf2_mark (struct dwarf2_cu *cu)
25333 if (cu->dependencies != NULL)
25334 htab_traverse (cu->dependencies, dwarf2_mark_helper, NULL);
25338 dwarf2_clear_marks (struct dwarf2_per_cu_data *per_cu)
25342 per_cu->cu->mark = 0;
25343 per_cu = per_cu->cu->read_in_chain;
25347 /* Trivial hash function for partial_die_info: the hash value of a DIE
25348 is its offset in .debug_info for this objfile. */
25351 partial_die_hash (const void *item)
25353 const struct partial_die_info *part_die
25354 = (const struct partial_die_info *) item;
25356 return to_underlying (part_die->sect_off);
25359 /* Trivial comparison function for partial_die_info structures: two DIEs
25360 are equal if they have the same offset. */
25363 partial_die_eq (const void *item_lhs, const void *item_rhs)
25365 const struct partial_die_info *part_die_lhs
25366 = (const struct partial_die_info *) item_lhs;
25367 const struct partial_die_info *part_die_rhs
25368 = (const struct partial_die_info *) item_rhs;
25370 return part_die_lhs->sect_off == part_die_rhs->sect_off;
25373 static struct cmd_list_element *set_dwarf_cmdlist;
25374 static struct cmd_list_element *show_dwarf_cmdlist;
25377 set_dwarf_cmd (const char *args, int from_tty)
25379 help_list (set_dwarf_cmdlist, "maintenance set dwarf ", all_commands,
25384 show_dwarf_cmd (const char *args, int from_tty)
25386 cmd_show_list (show_dwarf_cmdlist, from_tty, "");
25389 /* Free data associated with OBJFILE, if necessary. */
25392 dwarf2_per_objfile_free (struct objfile *objfile, void *d)
25394 struct dwarf2_per_objfile *data = (struct dwarf2_per_objfile *) d;
25397 /* Make sure we don't accidentally use dwarf2_per_objfile while
25399 dwarf2_per_objfile = NULL;
25401 for (ix = 0; ix < data->n_comp_units; ++ix)
25402 VEC_free (dwarf2_per_cu_ptr, data->all_comp_units[ix]->imported_symtabs);
25404 for (ix = 0; ix < data->n_type_units; ++ix)
25405 VEC_free (dwarf2_per_cu_ptr,
25406 data->all_type_units[ix]->per_cu.imported_symtabs);
25407 xfree (data->all_type_units);
25409 VEC_free (dwarf2_section_info_def, data->types);
25411 if (data->dwo_files)
25412 free_dwo_files (data->dwo_files, objfile);
25413 if (data->dwp_file)
25414 gdb_bfd_unref (data->dwp_file->dbfd);
25416 if (data->dwz_file && data->dwz_file->dwz_bfd)
25417 gdb_bfd_unref (data->dwz_file->dwz_bfd);
25419 if (data->index_table != NULL)
25420 data->index_table->~mapped_index ();
25424 /* The "save gdb-index" command. */
25426 /* Write SIZE bytes from the buffer pointed to by DATA to FILE, with
25430 file_write (FILE *file, const void *data, size_t size)
25432 if (fwrite (data, 1, size, file) != size)
25433 error (_("couldn't data write to file"));
25436 /* Write the contents of VEC to FILE, with error checking. */
25438 template<typename Elem, typename Alloc>
25440 file_write (FILE *file, const std::vector<Elem, Alloc> &vec)
25442 file_write (file, vec.data (), vec.size () * sizeof (vec[0]));
25445 /* In-memory buffer to prepare data to be written later to a file. */
25449 /* Copy DATA to the end of the buffer. */
25450 template<typename T>
25451 void append_data (const T &data)
25453 std::copy (reinterpret_cast<const gdb_byte *> (&data),
25454 reinterpret_cast<const gdb_byte *> (&data + 1),
25455 grow (sizeof (data)));
25458 /* Copy CSTR (a zero-terminated string) to the end of buffer. The
25459 terminating zero is appended too. */
25460 void append_cstr0 (const char *cstr)
25462 const size_t size = strlen (cstr) + 1;
25463 std::copy (cstr, cstr + size, grow (size));
25466 /* Store INPUT as ULEB128 to the end of buffer. */
25467 void append_unsigned_leb128 (ULONGEST input)
25471 gdb_byte output = input & 0x7f;
25475 append_data (output);
25481 /* Accept a host-format integer in VAL and append it to the buffer
25482 as a target-format integer which is LEN bytes long. */
25483 void append_uint (size_t len, bfd_endian byte_order, ULONGEST val)
25485 ::store_unsigned_integer (grow (len), len, byte_order, val);
25488 /* Return the size of the buffer. */
25489 size_t size () const
25491 return m_vec.size ();
25494 /* Return true iff the buffer is empty. */
25495 bool empty () const
25497 return m_vec.empty ();
25500 /* Write the buffer to FILE. */
25501 void file_write (FILE *file) const
25503 ::file_write (file, m_vec);
25507 /* Grow SIZE bytes at the end of the buffer. Returns a pointer to
25508 the start of the new block. */
25509 gdb_byte *grow (size_t size)
25511 m_vec.resize (m_vec.size () + size);
25512 return &*m_vec.end () - size;
25515 gdb::byte_vector m_vec;
25518 /* An entry in the symbol table. */
25519 struct symtab_index_entry
25521 /* The name of the symbol. */
25523 /* The offset of the name in the constant pool. */
25524 offset_type index_offset;
25525 /* A sorted vector of the indices of all the CUs that hold an object
25527 std::vector<offset_type> cu_indices;
25530 /* The symbol table. This is a power-of-2-sized hash table. */
25531 struct mapped_symtab
25535 data.resize (1024);
25538 offset_type n_elements = 0;
25539 std::vector<symtab_index_entry> data;
25542 /* Find a slot in SYMTAB for the symbol NAME. Returns a reference to
25545 Function is used only during write_hash_table so no index format backward
25546 compatibility is needed. */
25548 static symtab_index_entry &
25549 find_slot (struct mapped_symtab *symtab, const char *name)
25551 offset_type index, step, hash = mapped_index_string_hash (INT_MAX, name);
25553 index = hash & (symtab->data.size () - 1);
25554 step = ((hash * 17) & (symtab->data.size () - 1)) | 1;
25558 if (symtab->data[index].name == NULL
25559 || strcmp (name, symtab->data[index].name) == 0)
25560 return symtab->data[index];
25561 index = (index + step) & (symtab->data.size () - 1);
25565 /* Expand SYMTAB's hash table. */
25568 hash_expand (struct mapped_symtab *symtab)
25570 auto old_entries = std::move (symtab->data);
25572 symtab->data.clear ();
25573 symtab->data.resize (old_entries.size () * 2);
25575 for (auto &it : old_entries)
25576 if (it.name != NULL)
25578 auto &ref = find_slot (symtab, it.name);
25579 ref = std::move (it);
25583 /* Add an entry to SYMTAB. NAME is the name of the symbol.
25584 CU_INDEX is the index of the CU in which the symbol appears.
25585 IS_STATIC is one if the symbol is static, otherwise zero (global). */
25588 add_index_entry (struct mapped_symtab *symtab, const char *name,
25589 int is_static, gdb_index_symbol_kind kind,
25590 offset_type cu_index)
25592 offset_type cu_index_and_attrs;
25594 ++symtab->n_elements;
25595 if (4 * symtab->n_elements / 3 >= symtab->data.size ())
25596 hash_expand (symtab);
25598 symtab_index_entry &slot = find_slot (symtab, name);
25599 if (slot.name == NULL)
25602 /* index_offset is set later. */
25605 cu_index_and_attrs = 0;
25606 DW2_GDB_INDEX_CU_SET_VALUE (cu_index_and_attrs, cu_index);
25607 DW2_GDB_INDEX_SYMBOL_STATIC_SET_VALUE (cu_index_and_attrs, is_static);
25608 DW2_GDB_INDEX_SYMBOL_KIND_SET_VALUE (cu_index_and_attrs, kind);
25610 /* We don't want to record an index value twice as we want to avoid the
25612 We process all global symbols and then all static symbols
25613 (which would allow us to avoid the duplication by only having to check
25614 the last entry pushed), but a symbol could have multiple kinds in one CU.
25615 To keep things simple we don't worry about the duplication here and
25616 sort and uniqufy the list after we've processed all symbols. */
25617 slot.cu_indices.push_back (cu_index_and_attrs);
25620 /* Sort and remove duplicates of all symbols' cu_indices lists. */
25623 uniquify_cu_indices (struct mapped_symtab *symtab)
25625 for (auto &entry : symtab->data)
25627 if (entry.name != NULL && !entry.cu_indices.empty ())
25629 auto &cu_indices = entry.cu_indices;
25630 std::sort (cu_indices.begin (), cu_indices.end ());
25631 auto from = std::unique (cu_indices.begin (), cu_indices.end ());
25632 cu_indices.erase (from, cu_indices.end ());
25637 /* A form of 'const char *' suitable for container keys. Only the
25638 pointer is stored. The strings themselves are compared, not the
25643 c_str_view (const char *cstr)
25647 bool operator== (const c_str_view &other) const
25649 return strcmp (m_cstr, other.m_cstr) == 0;
25652 /* Return the underlying C string. Note, the returned string is
25653 only a reference with lifetime of this object. */
25654 const char *c_str () const
25660 friend class c_str_view_hasher;
25661 const char *const m_cstr;
25664 /* A std::unordered_map::hasher for c_str_view that uses the right
25665 hash function for strings in a mapped index. */
25666 class c_str_view_hasher
25669 size_t operator () (const c_str_view &x) const
25671 return mapped_index_string_hash (INT_MAX, x.m_cstr);
25675 /* A std::unordered_map::hasher for std::vector<>. */
25676 template<typename T>
25677 class vector_hasher
25680 size_t operator () (const std::vector<T> &key) const
25682 return iterative_hash (key.data (),
25683 sizeof (key.front ()) * key.size (), 0);
25687 /* Write the mapped hash table SYMTAB to the data buffer OUTPUT, with
25688 constant pool entries going into the data buffer CPOOL. */
25691 write_hash_table (mapped_symtab *symtab, data_buf &output, data_buf &cpool)
25694 /* Elements are sorted vectors of the indices of all the CUs that
25695 hold an object of this name. */
25696 std::unordered_map<std::vector<offset_type>, offset_type,
25697 vector_hasher<offset_type>>
25700 /* We add all the index vectors to the constant pool first, to
25701 ensure alignment is ok. */
25702 for (symtab_index_entry &entry : symtab->data)
25704 if (entry.name == NULL)
25706 gdb_assert (entry.index_offset == 0);
25708 /* Finding before inserting is faster than always trying to
25709 insert, because inserting always allocates a node, does the
25710 lookup, and then destroys the new node if another node
25711 already had the same key. C++17 try_emplace will avoid
25714 = symbol_hash_table.find (entry.cu_indices);
25715 if (found != symbol_hash_table.end ())
25717 entry.index_offset = found->second;
25721 symbol_hash_table.emplace (entry.cu_indices, cpool.size ());
25722 entry.index_offset = cpool.size ();
25723 cpool.append_data (MAYBE_SWAP (entry.cu_indices.size ()));
25724 for (const auto index : entry.cu_indices)
25725 cpool.append_data (MAYBE_SWAP (index));
25729 /* Now write out the hash table. */
25730 std::unordered_map<c_str_view, offset_type, c_str_view_hasher> str_table;
25731 for (const auto &entry : symtab->data)
25733 offset_type str_off, vec_off;
25735 if (entry.name != NULL)
25737 const auto insertpair = str_table.emplace (entry.name, cpool.size ());
25738 if (insertpair.second)
25739 cpool.append_cstr0 (entry.name);
25740 str_off = insertpair.first->second;
25741 vec_off = entry.index_offset;
25745 /* While 0 is a valid constant pool index, it is not valid
25746 to have 0 for both offsets. */
25751 output.append_data (MAYBE_SWAP (str_off));
25752 output.append_data (MAYBE_SWAP (vec_off));
25756 typedef std::unordered_map<partial_symtab *, unsigned int> psym_index_map;
25758 /* Helper struct for building the address table. */
25759 struct addrmap_index_data
25761 addrmap_index_data (data_buf &addr_vec_, psym_index_map &cu_index_htab_)
25762 : addr_vec (addr_vec_), cu_index_htab (cu_index_htab_)
25765 struct objfile *objfile;
25766 data_buf &addr_vec;
25767 psym_index_map &cu_index_htab;
25769 /* Non-zero if the previous_* fields are valid.
25770 We can't write an entry until we see the next entry (since it is only then
25771 that we know the end of the entry). */
25772 int previous_valid;
25773 /* Index of the CU in the table of all CUs in the index file. */
25774 unsigned int previous_cu_index;
25775 /* Start address of the CU. */
25776 CORE_ADDR previous_cu_start;
25779 /* Write an address entry to ADDR_VEC. */
25782 add_address_entry (struct objfile *objfile, data_buf &addr_vec,
25783 CORE_ADDR start, CORE_ADDR end, unsigned int cu_index)
25785 CORE_ADDR baseaddr;
25787 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
25789 addr_vec.append_uint (8, BFD_ENDIAN_LITTLE, start - baseaddr);
25790 addr_vec.append_uint (8, BFD_ENDIAN_LITTLE, end - baseaddr);
25791 addr_vec.append_data (MAYBE_SWAP (cu_index));
25794 /* Worker function for traversing an addrmap to build the address table. */
25797 add_address_entry_worker (void *datap, CORE_ADDR start_addr, void *obj)
25799 struct addrmap_index_data *data = (struct addrmap_index_data *) datap;
25800 struct partial_symtab *pst = (struct partial_symtab *) obj;
25802 if (data->previous_valid)
25803 add_address_entry (data->objfile, data->addr_vec,
25804 data->previous_cu_start, start_addr,
25805 data->previous_cu_index);
25807 data->previous_cu_start = start_addr;
25810 const auto it = data->cu_index_htab.find (pst);
25811 gdb_assert (it != data->cu_index_htab.cend ());
25812 data->previous_cu_index = it->second;
25813 data->previous_valid = 1;
25816 data->previous_valid = 0;
25821 /* Write OBJFILE's address map to ADDR_VEC.
25822 CU_INDEX_HTAB is used to map addrmap entries to their CU indices
25823 in the index file. */
25826 write_address_map (struct objfile *objfile, data_buf &addr_vec,
25827 psym_index_map &cu_index_htab)
25829 struct addrmap_index_data addrmap_index_data (addr_vec, cu_index_htab);
25831 /* When writing the address table, we have to cope with the fact that
25832 the addrmap iterator only provides the start of a region; we have to
25833 wait until the next invocation to get the start of the next region. */
25835 addrmap_index_data.objfile = objfile;
25836 addrmap_index_data.previous_valid = 0;
25838 addrmap_foreach (objfile->psymtabs_addrmap, add_address_entry_worker,
25839 &addrmap_index_data);
25841 /* It's highly unlikely the last entry (end address = 0xff...ff)
25842 is valid, but we should still handle it.
25843 The end address is recorded as the start of the next region, but that
25844 doesn't work here. To cope we pass 0xff...ff, this is a rare situation
25846 if (addrmap_index_data.previous_valid)
25847 add_address_entry (objfile, addr_vec,
25848 addrmap_index_data.previous_cu_start, (CORE_ADDR) -1,
25849 addrmap_index_data.previous_cu_index);
25852 /* Return the symbol kind of PSYM. */
25854 static gdb_index_symbol_kind
25855 symbol_kind (struct partial_symbol *psym)
25857 domain_enum domain = PSYMBOL_DOMAIN (psym);
25858 enum address_class aclass = PSYMBOL_CLASS (psym);
25866 return GDB_INDEX_SYMBOL_KIND_FUNCTION;
25868 return GDB_INDEX_SYMBOL_KIND_TYPE;
25870 case LOC_CONST_BYTES:
25871 case LOC_OPTIMIZED_OUT:
25873 return GDB_INDEX_SYMBOL_KIND_VARIABLE;
25875 /* Note: It's currently impossible to recognize psyms as enum values
25876 short of reading the type info. For now punt. */
25877 return GDB_INDEX_SYMBOL_KIND_VARIABLE;
25879 /* There are other LOC_FOO values that one might want to classify
25880 as variables, but dwarf2read.c doesn't currently use them. */
25881 return GDB_INDEX_SYMBOL_KIND_OTHER;
25883 case STRUCT_DOMAIN:
25884 return GDB_INDEX_SYMBOL_KIND_TYPE;
25886 return GDB_INDEX_SYMBOL_KIND_OTHER;
25890 /* Add a list of partial symbols to SYMTAB. */
25893 write_psymbols (struct mapped_symtab *symtab,
25894 std::unordered_set<partial_symbol *> &psyms_seen,
25895 struct partial_symbol **psymp,
25897 offset_type cu_index,
25900 for (; count-- > 0; ++psymp)
25902 struct partial_symbol *psym = *psymp;
25904 if (SYMBOL_LANGUAGE (psym) == language_ada)
25905 error (_("Ada is not currently supported by the index"));
25907 /* Only add a given psymbol once. */
25908 if (psyms_seen.insert (psym).second)
25910 gdb_index_symbol_kind kind = symbol_kind (psym);
25912 add_index_entry (symtab, SYMBOL_SEARCH_NAME (psym),
25913 is_static, kind, cu_index);
25918 /* A helper struct used when iterating over debug_types. */
25919 struct signatured_type_index_data
25921 signatured_type_index_data (data_buf &types_list_,
25922 std::unordered_set<partial_symbol *> &psyms_seen_)
25923 : types_list (types_list_), psyms_seen (psyms_seen_)
25926 struct objfile *objfile;
25927 struct mapped_symtab *symtab;
25928 data_buf &types_list;
25929 std::unordered_set<partial_symbol *> &psyms_seen;
25933 /* A helper function that writes a single signatured_type to an
25937 write_one_signatured_type (void **slot, void *d)
25939 struct signatured_type_index_data *info
25940 = (struct signatured_type_index_data *) d;
25941 struct signatured_type *entry = (struct signatured_type *) *slot;
25942 struct partial_symtab *psymtab = entry->per_cu.v.psymtab;
25944 write_psymbols (info->symtab,
25946 &info->objfile->global_psymbols[psymtab->globals_offset],
25947 psymtab->n_global_syms, info->cu_index,
25949 write_psymbols (info->symtab,
25951 &info->objfile->static_psymbols[psymtab->statics_offset],
25952 psymtab->n_static_syms, info->cu_index,
25955 info->types_list.append_uint (8, BFD_ENDIAN_LITTLE,
25956 to_underlying (entry->per_cu.sect_off));
25957 info->types_list.append_uint (8, BFD_ENDIAN_LITTLE,
25958 to_underlying (entry->type_offset_in_tu));
25959 info->types_list.append_uint (8, BFD_ENDIAN_LITTLE, entry->signature);
25966 /* Recurse into all "included" dependencies and count their symbols as
25967 if they appeared in this psymtab. */
25970 recursively_count_psymbols (struct partial_symtab *psymtab,
25971 size_t &psyms_seen)
25973 for (int i = 0; i < psymtab->number_of_dependencies; ++i)
25974 if (psymtab->dependencies[i]->user != NULL)
25975 recursively_count_psymbols (psymtab->dependencies[i],
25978 psyms_seen += psymtab->n_global_syms;
25979 psyms_seen += psymtab->n_static_syms;
25982 /* Recurse into all "included" dependencies and write their symbols as
25983 if they appeared in this psymtab. */
25986 recursively_write_psymbols (struct objfile *objfile,
25987 struct partial_symtab *psymtab,
25988 struct mapped_symtab *symtab,
25989 std::unordered_set<partial_symbol *> &psyms_seen,
25990 offset_type cu_index)
25994 for (i = 0; i < psymtab->number_of_dependencies; ++i)
25995 if (psymtab->dependencies[i]->user != NULL)
25996 recursively_write_psymbols (objfile, psymtab->dependencies[i],
25997 symtab, psyms_seen, cu_index);
25999 write_psymbols (symtab,
26001 &objfile->global_psymbols[psymtab->globals_offset],
26002 psymtab->n_global_syms, cu_index,
26004 write_psymbols (symtab,
26006 &objfile->static_psymbols[psymtab->statics_offset],
26007 psymtab->n_static_syms, cu_index,
26011 /* DWARF-5 .debug_names builder. */
26015 debug_names (bool is_dwarf64, bfd_endian dwarf5_byte_order)
26016 : m_dwarf5_byte_order (dwarf5_byte_order),
26017 m_dwarf32 (dwarf5_byte_order),
26018 m_dwarf64 (dwarf5_byte_order),
26019 m_dwarf (is_dwarf64
26020 ? static_cast<dwarf &> (m_dwarf64)
26021 : static_cast<dwarf &> (m_dwarf32)),
26022 m_name_table_string_offs (m_dwarf.name_table_string_offs),
26023 m_name_table_entry_offs (m_dwarf.name_table_entry_offs)
26026 /* Insert one symbol. */
26027 void insert (const partial_symbol *psym, int cu_index, bool is_static)
26029 const int dwarf_tag = psymbol_tag (psym);
26030 if (dwarf_tag == 0)
26032 const char *const name = SYMBOL_SEARCH_NAME (psym);
26033 const auto insertpair
26034 = m_name_to_value_set.emplace (c_str_view (name),
26035 std::set<symbol_value> ());
26036 std::set<symbol_value> &value_set = insertpair.first->second;
26037 value_set.emplace (symbol_value (dwarf_tag, cu_index, is_static));
26040 /* Build all the tables. All symbols must be already inserted.
26041 This function does not call file_write, caller has to do it
26045 /* Verify the build method has not be called twice. */
26046 gdb_assert (m_abbrev_table.empty ());
26047 const size_t name_count = m_name_to_value_set.size ();
26048 m_bucket_table.resize
26049 (std::pow (2, std::ceil (std::log2 (name_count * 4 / 3))));
26050 m_hash_table.reserve (name_count);
26051 m_name_table_string_offs.reserve (name_count);
26052 m_name_table_entry_offs.reserve (name_count);
26054 /* Map each hash of symbol to its name and value. */
26055 struct hash_it_pair
26058 decltype (m_name_to_value_set)::const_iterator it;
26060 std::vector<std::forward_list<hash_it_pair>> bucket_hash;
26061 bucket_hash.resize (m_bucket_table.size ());
26062 for (decltype (m_name_to_value_set)::const_iterator it
26063 = m_name_to_value_set.cbegin ();
26064 it != m_name_to_value_set.cend ();
26067 const char *const name = it->first.c_str ();
26068 const uint32_t hash = dwarf5_djb_hash (name);
26069 hash_it_pair hashitpair;
26070 hashitpair.hash = hash;
26071 hashitpair.it = it;
26072 auto &slot = bucket_hash[hash % bucket_hash.size()];
26073 slot.push_front (std::move (hashitpair));
26075 for (size_t bucket_ix = 0; bucket_ix < bucket_hash.size (); ++bucket_ix)
26077 const std::forward_list<hash_it_pair> &hashitlist
26078 = bucket_hash[bucket_ix];
26079 if (hashitlist.empty ())
26081 uint32_t &bucket_slot = m_bucket_table[bucket_ix];
26082 /* The hashes array is indexed starting at 1. */
26083 store_unsigned_integer (reinterpret_cast<gdb_byte *> (&bucket_slot),
26084 sizeof (bucket_slot), m_dwarf5_byte_order,
26085 m_hash_table.size () + 1);
26086 for (const hash_it_pair &hashitpair : hashitlist)
26088 m_hash_table.push_back (0);
26089 store_unsigned_integer (reinterpret_cast<gdb_byte *>
26090 (&m_hash_table.back ()),
26091 sizeof (m_hash_table.back ()),
26092 m_dwarf5_byte_order, hashitpair.hash);
26093 const c_str_view &name = hashitpair.it->first;
26094 const std::set<symbol_value> &value_set = hashitpair.it->second;
26095 m_name_table_string_offs.push_back_reorder
26096 (m_debugstrlookup.lookup (name.c_str ()));
26097 m_name_table_entry_offs.push_back_reorder (m_entry_pool.size ());
26098 gdb_assert (!value_set.empty ());
26099 for (const symbol_value &value : value_set)
26101 int &idx = m_indexkey_to_idx[index_key (value.dwarf_tag,
26105 idx = m_idx_next++;
26106 m_abbrev_table.append_unsigned_leb128 (idx);
26107 m_abbrev_table.append_unsigned_leb128 (value.dwarf_tag);
26108 m_abbrev_table.append_unsigned_leb128 (DW_IDX_compile_unit);
26109 m_abbrev_table.append_unsigned_leb128 (DW_FORM_udata);
26110 m_abbrev_table.append_unsigned_leb128 (value.is_static
26111 ? DW_IDX_GNU_internal
26112 : DW_IDX_GNU_external);
26113 m_abbrev_table.append_unsigned_leb128 (DW_FORM_flag_present);
26115 /* Terminate attributes list. */
26116 m_abbrev_table.append_unsigned_leb128 (0);
26117 m_abbrev_table.append_unsigned_leb128 (0);
26120 m_entry_pool.append_unsigned_leb128 (idx);
26121 m_entry_pool.append_unsigned_leb128 (value.cu_index);
26124 /* Terminate the list of CUs. */
26125 m_entry_pool.append_unsigned_leb128 (0);
26128 gdb_assert (m_hash_table.size () == name_count);
26130 /* Terminate tags list. */
26131 m_abbrev_table.append_unsigned_leb128 (0);
26134 /* Return .debug_names bucket count. This must be called only after
26135 calling the build method. */
26136 uint32_t bucket_count () const
26138 /* Verify the build method has been already called. */
26139 gdb_assert (!m_abbrev_table.empty ());
26140 const uint32_t retval = m_bucket_table.size ();
26142 /* Check for overflow. */
26143 gdb_assert (retval == m_bucket_table.size ());
26147 /* Return .debug_names names count. This must be called only after
26148 calling the build method. */
26149 uint32_t name_count () const
26151 /* Verify the build method has been already called. */
26152 gdb_assert (!m_abbrev_table.empty ());
26153 const uint32_t retval = m_hash_table.size ();
26155 /* Check for overflow. */
26156 gdb_assert (retval == m_hash_table.size ());
26160 /* Return number of bytes of .debug_names abbreviation table. This
26161 must be called only after calling the build method. */
26162 uint32_t abbrev_table_bytes () const
26164 gdb_assert (!m_abbrev_table.empty ());
26165 return m_abbrev_table.size ();
26168 /* Recurse into all "included" dependencies and store their symbols
26169 as if they appeared in this psymtab. */
26170 void recursively_write_psymbols
26171 (struct objfile *objfile,
26172 struct partial_symtab *psymtab,
26173 std::unordered_set<partial_symbol *> &psyms_seen,
26176 for (int i = 0; i < psymtab->number_of_dependencies; ++i)
26177 if (psymtab->dependencies[i]->user != NULL)
26178 recursively_write_psymbols (objfile, psymtab->dependencies[i],
26179 psyms_seen, cu_index);
26181 write_psymbols (psyms_seen,
26182 &objfile->global_psymbols[psymtab->globals_offset],
26183 psymtab->n_global_syms, cu_index, false);
26184 write_psymbols (psyms_seen,
26185 &objfile->static_psymbols[psymtab->statics_offset],
26186 psymtab->n_static_syms, cu_index, true);
26189 /* Return number of bytes the .debug_names section will have. This
26190 must be called only after calling the build method. */
26191 size_t bytes () const
26193 /* Verify the build method has been already called. */
26194 gdb_assert (!m_abbrev_table.empty ());
26195 size_t expected_bytes = 0;
26196 expected_bytes += m_bucket_table.size () * sizeof (m_bucket_table[0]);
26197 expected_bytes += m_hash_table.size () * sizeof (m_hash_table[0]);
26198 expected_bytes += m_name_table_string_offs.bytes ();
26199 expected_bytes += m_name_table_entry_offs.bytes ();
26200 expected_bytes += m_abbrev_table.size ();
26201 expected_bytes += m_entry_pool.size ();
26202 return expected_bytes;
26205 /* Write .debug_names to FILE_NAMES and .debug_str addition to
26206 FILE_STR. This must be called only after calling the build
26208 void file_write (FILE *file_names, FILE *file_str) const
26210 /* Verify the build method has been already called. */
26211 gdb_assert (!m_abbrev_table.empty ());
26212 ::file_write (file_names, m_bucket_table);
26213 ::file_write (file_names, m_hash_table);
26214 m_name_table_string_offs.file_write (file_names);
26215 m_name_table_entry_offs.file_write (file_names);
26216 m_abbrev_table.file_write (file_names);
26217 m_entry_pool.file_write (file_names);
26218 m_debugstrlookup.file_write (file_str);
26223 /* Storage for symbol names mapping them to their .debug_str section
26225 class debug_str_lookup
26229 /* Object costructor to be called for current DWARF2_PER_OBJFILE.
26230 All .debug_str section strings are automatically stored. */
26231 debug_str_lookup ()
26232 : m_abfd (dwarf2_per_objfile->objfile->obfd)
26234 dwarf2_read_section (dwarf2_per_objfile->objfile,
26235 &dwarf2_per_objfile->str);
26236 if (dwarf2_per_objfile->str.buffer == NULL)
26238 for (const gdb_byte *data = dwarf2_per_objfile->str.buffer;
26239 data < (dwarf2_per_objfile->str.buffer
26240 + dwarf2_per_objfile->str.size);)
26242 const char *const s = reinterpret_cast<const char *> (data);
26243 const auto insertpair
26244 = m_str_table.emplace (c_str_view (s),
26245 data - dwarf2_per_objfile->str.buffer);
26246 if (!insertpair.second)
26247 complaint (&symfile_complaints,
26248 _("Duplicate string \"%s\" in "
26249 ".debug_str section [in module %s]"),
26250 s, bfd_get_filename (m_abfd));
26251 data += strlen (s) + 1;
26255 /* Return offset of symbol name S in the .debug_str section. Add
26256 such symbol to the section's end if it does not exist there
26258 size_t lookup (const char *s)
26260 const auto it = m_str_table.find (c_str_view (s));
26261 if (it != m_str_table.end ())
26263 const size_t offset = (dwarf2_per_objfile->str.size
26264 + m_str_add_buf.size ());
26265 m_str_table.emplace (c_str_view (s), offset);
26266 m_str_add_buf.append_cstr0 (s);
26270 /* Append the end of the .debug_str section to FILE. */
26271 void file_write (FILE *file) const
26273 m_str_add_buf.file_write (file);
26277 std::unordered_map<c_str_view, size_t, c_str_view_hasher> m_str_table;
26280 /* Data to add at the end of .debug_str for new needed symbol names. */
26281 data_buf m_str_add_buf;
26284 /* Container to map used DWARF tags to their .debug_names abbreviation
26289 index_key (int dwarf_tag_, bool is_static_)
26290 : dwarf_tag (dwarf_tag_), is_static (is_static_)
26295 operator== (const index_key &other) const
26297 return dwarf_tag == other.dwarf_tag && is_static == other.is_static;
26300 const int dwarf_tag;
26301 const bool is_static;
26304 /* Provide std::unordered_map::hasher for index_key. */
26305 class index_key_hasher
26309 operator () (const index_key &key) const
26311 return (std::hash<int>() (key.dwarf_tag) << 1) | key.is_static;
26315 /* Parameters of one symbol entry. */
26319 const int dwarf_tag, cu_index;
26320 const bool is_static;
26322 symbol_value (int dwarf_tag_, int cu_index_, bool is_static_)
26323 : dwarf_tag (dwarf_tag_), cu_index (cu_index_), is_static (is_static_)
26327 operator< (const symbol_value &other) const
26346 /* Abstract base class to unify DWARF-32 and DWARF-64 name table
26351 const bfd_endian dwarf5_byte_order;
26353 explicit offset_vec (bfd_endian dwarf5_byte_order_)
26354 : dwarf5_byte_order (dwarf5_byte_order_)
26357 /* Call std::vector::reserve for NELEM elements. */
26358 virtual void reserve (size_t nelem) = 0;
26360 /* Call std::vector::push_back with store_unsigned_integer byte
26361 reordering for ELEM. */
26362 virtual void push_back_reorder (size_t elem) = 0;
26364 /* Return expected output size in bytes. */
26365 virtual size_t bytes () const = 0;
26367 /* Write name table to FILE. */
26368 virtual void file_write (FILE *file) const = 0;
26371 /* Template to unify DWARF-32 and DWARF-64 output. */
26372 template<typename OffsetSize>
26373 class offset_vec_tmpl : public offset_vec
26376 explicit offset_vec_tmpl (bfd_endian dwarf5_byte_order_)
26377 : offset_vec (dwarf5_byte_order_)
26380 /* Implement offset_vec::reserve. */
26381 void reserve (size_t nelem) override
26383 m_vec.reserve (nelem);
26386 /* Implement offset_vec::push_back_reorder. */
26387 void push_back_reorder (size_t elem) override
26389 m_vec.push_back (elem);
26390 /* Check for overflow. */
26391 gdb_assert (m_vec.back () == elem);
26392 store_unsigned_integer (reinterpret_cast<gdb_byte *> (&m_vec.back ()),
26393 sizeof (m_vec.back ()), dwarf5_byte_order, elem);
26396 /* Implement offset_vec::bytes. */
26397 size_t bytes () const override
26399 return m_vec.size () * sizeof (m_vec[0]);
26402 /* Implement offset_vec::file_write. */
26403 void file_write (FILE *file) const override
26405 ::file_write (file, m_vec);
26409 std::vector<OffsetSize> m_vec;
26412 /* Base class to unify DWARF-32 and DWARF-64 .debug_names output
26413 respecting name table width. */
26417 offset_vec &name_table_string_offs, &name_table_entry_offs;
26419 dwarf (offset_vec &name_table_string_offs_,
26420 offset_vec &name_table_entry_offs_)
26421 : name_table_string_offs (name_table_string_offs_),
26422 name_table_entry_offs (name_table_entry_offs_)
26427 /* Template to unify DWARF-32 and DWARF-64 .debug_names output
26428 respecting name table width. */
26429 template<typename OffsetSize>
26430 class dwarf_tmpl : public dwarf
26433 explicit dwarf_tmpl (bfd_endian dwarf5_byte_order_)
26434 : dwarf (m_name_table_string_offs, m_name_table_entry_offs),
26435 m_name_table_string_offs (dwarf5_byte_order_),
26436 m_name_table_entry_offs (dwarf5_byte_order_)
26440 offset_vec_tmpl<OffsetSize> m_name_table_string_offs;
26441 offset_vec_tmpl<OffsetSize> m_name_table_entry_offs;
26444 /* Try to reconstruct original DWARF tag for given partial_symbol.
26445 This function is not DWARF-5 compliant but it is sufficient for
26446 GDB as a DWARF-5 index consumer. */
26447 static int psymbol_tag (const struct partial_symbol *psym)
26449 domain_enum domain = PSYMBOL_DOMAIN (psym);
26450 enum address_class aclass = PSYMBOL_CLASS (psym);
26458 return DW_TAG_subprogram;
26460 return DW_TAG_typedef;
26462 case LOC_CONST_BYTES:
26463 case LOC_OPTIMIZED_OUT:
26465 return DW_TAG_variable;
26467 /* Note: It's currently impossible to recognize psyms as enum values
26468 short of reading the type info. For now punt. */
26469 return DW_TAG_variable;
26471 /* There are other LOC_FOO values that one might want to classify
26472 as variables, but dwarf2read.c doesn't currently use them. */
26473 return DW_TAG_variable;
26475 case STRUCT_DOMAIN:
26476 return DW_TAG_structure_type;
26482 /* Call insert for all partial symbols and mark them in PSYMS_SEEN. */
26483 void write_psymbols (std::unordered_set<partial_symbol *> &psyms_seen,
26484 struct partial_symbol **psymp, int count, int cu_index,
26487 for (; count-- > 0; ++psymp)
26489 struct partial_symbol *psym = *psymp;
26491 if (SYMBOL_LANGUAGE (psym) == language_ada)
26492 error (_("Ada is not currently supported by the index"));
26494 /* Only add a given psymbol once. */
26495 if (psyms_seen.insert (psym).second)
26496 insert (psym, cu_index, is_static);
26500 /* Store value of each symbol. */
26501 std::unordered_map<c_str_view, std::set<symbol_value>, c_str_view_hasher>
26502 m_name_to_value_set;
26504 /* Tables of DWARF-5 .debug_names. They are in object file byte
26506 std::vector<uint32_t> m_bucket_table;
26507 std::vector<uint32_t> m_hash_table;
26509 const bfd_endian m_dwarf5_byte_order;
26510 dwarf_tmpl<uint32_t> m_dwarf32;
26511 dwarf_tmpl<uint64_t> m_dwarf64;
26513 offset_vec &m_name_table_string_offs, &m_name_table_entry_offs;
26514 debug_str_lookup m_debugstrlookup;
26516 /* Map each used .debug_names abbreviation tag parameter to its
26518 std::unordered_map<index_key, int, index_key_hasher> m_indexkey_to_idx;
26520 /* Next unused .debug_names abbreviation tag for
26521 m_indexkey_to_idx. */
26522 int m_idx_next = 1;
26524 /* .debug_names abbreviation table. */
26525 data_buf m_abbrev_table;
26527 /* .debug_names entry pool. */
26528 data_buf m_entry_pool;
26531 /* Return iff any of the needed offsets does not fit into 32-bit
26532 .debug_names section. */
26535 check_dwarf64_offsets ()
26537 for (int i = 0; i < dwarf2_per_objfile->n_comp_units; ++i)
26539 const dwarf2_per_cu_data &per_cu = *dwarf2_per_objfile->all_comp_units[i];
26541 if (to_underlying (per_cu.sect_off) >= (static_cast<uint64_t> (1) << 32))
26544 for (int i = 0; i < dwarf2_per_objfile->n_type_units; ++i)
26546 const signatured_type &sigtype = *dwarf2_per_objfile->all_type_units[i];
26547 const dwarf2_per_cu_data &per_cu = sigtype.per_cu;
26549 if (to_underlying (per_cu.sect_off) >= (static_cast<uint64_t> (1) << 32))
26555 /* The psyms_seen set is potentially going to be largish (~40k
26556 elements when indexing a -g3 build of GDB itself). Estimate the
26557 number of elements in order to avoid too many rehashes, which
26558 require rebuilding buckets and thus many trips to
26564 size_t psyms_count = 0;
26565 for (int i = 0; i < dwarf2_per_objfile->n_comp_units; ++i)
26567 struct dwarf2_per_cu_data *per_cu
26568 = dwarf2_per_objfile->all_comp_units[i];
26569 struct partial_symtab *psymtab = per_cu->v.psymtab;
26571 if (psymtab != NULL && psymtab->user == NULL)
26572 recursively_count_psymbols (psymtab, psyms_count);
26574 /* Generating an index for gdb itself shows a ratio of
26575 TOTAL_SEEN_SYMS/UNIQUE_SYMS or ~5. 4 seems like a good bet. */
26576 return psyms_count / 4;
26579 /* Write new .gdb_index section for OBJFILE into OUT_FILE.
26580 Return how many bytes were expected to be written into OUT_FILE. */
26583 write_gdbindex (struct objfile *objfile, FILE *out_file)
26585 mapped_symtab symtab;
26588 /* While we're scanning CU's create a table that maps a psymtab pointer
26589 (which is what addrmap records) to its index (which is what is recorded
26590 in the index file). This will later be needed to write the address
26592 psym_index_map cu_index_htab;
26593 cu_index_htab.reserve (dwarf2_per_objfile->n_comp_units);
26595 /* The CU list is already sorted, so we don't need to do additional
26596 work here. Also, the debug_types entries do not appear in
26597 all_comp_units, but only in their own hash table. */
26599 std::unordered_set<partial_symbol *> psyms_seen (psyms_seen_size ());
26600 for (int i = 0; i < dwarf2_per_objfile->n_comp_units; ++i)
26602 struct dwarf2_per_cu_data *per_cu
26603 = dwarf2_per_objfile->all_comp_units[i];
26604 struct partial_symtab *psymtab = per_cu->v.psymtab;
26606 /* CU of a shared file from 'dwz -m' may be unused by this main file.
26607 It may be referenced from a local scope but in such case it does not
26608 need to be present in .gdb_index. */
26609 if (psymtab == NULL)
26612 if (psymtab->user == NULL)
26613 recursively_write_psymbols (objfile, psymtab, &symtab,
26616 const auto insertpair = cu_index_htab.emplace (psymtab, i);
26617 gdb_assert (insertpair.second);
26619 cu_list.append_uint (8, BFD_ENDIAN_LITTLE,
26620 to_underlying (per_cu->sect_off));
26621 cu_list.append_uint (8, BFD_ENDIAN_LITTLE, per_cu->length);
26624 /* Dump the address map. */
26626 write_address_map (objfile, addr_vec, cu_index_htab);
26628 /* Write out the .debug_type entries, if any. */
26629 data_buf types_cu_list;
26630 if (dwarf2_per_objfile->signatured_types)
26632 signatured_type_index_data sig_data (types_cu_list,
26635 sig_data.objfile = objfile;
26636 sig_data.symtab = &symtab;
26637 sig_data.cu_index = dwarf2_per_objfile->n_comp_units;
26638 htab_traverse_noresize (dwarf2_per_objfile->signatured_types,
26639 write_one_signatured_type, &sig_data);
26642 /* Now that we've processed all symbols we can shrink their cu_indices
26644 uniquify_cu_indices (&symtab);
26646 data_buf symtab_vec, constant_pool;
26647 write_hash_table (&symtab, symtab_vec, constant_pool);
26650 const offset_type size_of_contents = 6 * sizeof (offset_type);
26651 offset_type total_len = size_of_contents;
26653 /* The version number. */
26654 contents.append_data (MAYBE_SWAP (8));
26656 /* The offset of the CU list from the start of the file. */
26657 contents.append_data (MAYBE_SWAP (total_len));
26658 total_len += cu_list.size ();
26660 /* The offset of the types CU list from the start of the file. */
26661 contents.append_data (MAYBE_SWAP (total_len));
26662 total_len += types_cu_list.size ();
26664 /* The offset of the address table from the start of the file. */
26665 contents.append_data (MAYBE_SWAP (total_len));
26666 total_len += addr_vec.size ();
26668 /* The offset of the symbol table from the start of the file. */
26669 contents.append_data (MAYBE_SWAP (total_len));
26670 total_len += symtab_vec.size ();
26672 /* The offset of the constant pool from the start of the file. */
26673 contents.append_data (MAYBE_SWAP (total_len));
26674 total_len += constant_pool.size ();
26676 gdb_assert (contents.size () == size_of_contents);
26678 contents.file_write (out_file);
26679 cu_list.file_write (out_file);
26680 types_cu_list.file_write (out_file);
26681 addr_vec.file_write (out_file);
26682 symtab_vec.file_write (out_file);
26683 constant_pool.file_write (out_file);
26688 /* DWARF-5 augmentation string for GDB's DW_IDX_GNU_* extension. */
26689 static const gdb_byte dwarf5_gdb_augmentation[] = { 'G', 'D', 'B', 0 };
26691 /* Write a new .debug_names section for OBJFILE into OUT_FILE, write
26692 needed addition to .debug_str section to OUT_FILE_STR. Return how
26693 many bytes were expected to be written into OUT_FILE. */
26696 write_debug_names (struct objfile *objfile, FILE *out_file, FILE *out_file_str)
26698 const bool dwarf5_is_dwarf64 = check_dwarf64_offsets ();
26699 const int dwarf5_offset_size = dwarf5_is_dwarf64 ? 8 : 4;
26700 const enum bfd_endian dwarf5_byte_order
26701 = gdbarch_byte_order (get_objfile_arch (objfile));
26703 /* The CU list is already sorted, so we don't need to do additional
26704 work here. Also, the debug_types entries do not appear in
26705 all_comp_units, but only in their own hash table. */
26707 debug_names nametable (dwarf5_is_dwarf64, dwarf5_byte_order);
26708 std::unordered_set<partial_symbol *> psyms_seen (psyms_seen_size ());
26709 for (int i = 0; i < dwarf2_per_objfile->n_comp_units; ++i)
26711 const dwarf2_per_cu_data *per_cu = dwarf2_per_objfile->all_comp_units[i];
26712 partial_symtab *psymtab = per_cu->v.psymtab;
26714 /* CU of a shared file from 'dwz -m' may be unused by this main
26715 file. It may be referenced from a local scope but in such
26716 case it does not need to be present in .debug_names. */
26717 if (psymtab == NULL)
26720 if (psymtab->user == NULL)
26721 nametable.recursively_write_psymbols (objfile, psymtab, psyms_seen, i);
26723 cu_list.append_uint (dwarf5_offset_size, dwarf5_byte_order,
26724 to_underlying (per_cu->sect_off));
26726 nametable.build ();
26728 /* No addr_vec - DWARF-5 uses .debug_aranges generated by GCC. */
26730 data_buf types_cu_list;
26731 for (int i = 0; i < dwarf2_per_objfile->n_type_units; ++i)
26733 const signatured_type &sigtype = *dwarf2_per_objfile->all_type_units[i];
26734 const dwarf2_per_cu_data &per_cu = sigtype.per_cu;
26736 types_cu_list.append_uint (dwarf5_offset_size, dwarf5_byte_order,
26737 to_underlying (per_cu.sect_off));
26740 const offset_type bytes_of_header
26741 = ((dwarf5_is_dwarf64 ? 12 : 4)
26743 + sizeof (dwarf5_gdb_augmentation));
26744 size_t expected_bytes = 0;
26745 expected_bytes += bytes_of_header;
26746 expected_bytes += cu_list.size ();
26747 expected_bytes += types_cu_list.size ();
26748 expected_bytes += nametable.bytes ();
26751 if (!dwarf5_is_dwarf64)
26753 const uint64_t size64 = expected_bytes - 4;
26754 gdb_assert (size64 < 0xfffffff0);
26755 header.append_uint (4, dwarf5_byte_order, size64);
26759 header.append_uint (4, dwarf5_byte_order, 0xffffffff);
26760 header.append_uint (8, dwarf5_byte_order, expected_bytes - 12);
26763 /* The version number. */
26764 header.append_uint (2, dwarf5_byte_order, 5);
26767 header.append_uint (2, dwarf5_byte_order, 0);
26769 /* comp_unit_count - The number of CUs in the CU list. */
26770 header.append_uint (4, dwarf5_byte_order, dwarf2_per_objfile->n_comp_units);
26772 /* local_type_unit_count - The number of TUs in the local TU
26774 header.append_uint (4, dwarf5_byte_order, dwarf2_per_objfile->n_type_units);
26776 /* foreign_type_unit_count - The number of TUs in the foreign TU
26778 header.append_uint (4, dwarf5_byte_order, 0);
26780 /* bucket_count - The number of hash buckets in the hash lookup
26782 header.append_uint (4, dwarf5_byte_order, nametable.bucket_count ());
26784 /* name_count - The number of unique names in the index. */
26785 header.append_uint (4, dwarf5_byte_order, nametable.name_count ());
26787 /* abbrev_table_size - The size in bytes of the abbreviations
26789 header.append_uint (4, dwarf5_byte_order, nametable.abbrev_table_bytes ());
26791 /* augmentation_string_size - The size in bytes of the augmentation
26792 string. This value is rounded up to a multiple of 4. */
26793 static_assert (sizeof (dwarf5_gdb_augmentation) % 4 == 0, "");
26794 header.append_uint (4, dwarf5_byte_order, sizeof (dwarf5_gdb_augmentation));
26795 header.append_data (dwarf5_gdb_augmentation);
26797 gdb_assert (header.size () == bytes_of_header);
26799 header.file_write (out_file);
26800 cu_list.file_write (out_file);
26801 types_cu_list.file_write (out_file);
26802 nametable.file_write (out_file, out_file_str);
26804 return expected_bytes;
26807 /* Assert that FILE's size is EXPECTED_SIZE. Assumes file's seek
26808 position is at the end of the file. */
26811 assert_file_size (FILE *file, const char *filename, size_t expected_size)
26813 const auto file_size = ftell (file);
26814 if (file_size == -1)
26815 error (_("Can't get `%s' size"), filename);
26816 gdb_assert (file_size == expected_size);
26819 /* An index variant. */
26822 /* GDB's own .gdb_index format. */
26825 /* DWARF5 .debug_names. */
26829 /* Create an index file for OBJFILE in the directory DIR. */
26832 write_psymtabs_to_index (struct objfile *objfile, const char *dir,
26833 dw_index_kind index_kind)
26835 if (dwarf2_per_objfile->using_index)
26836 error (_("Cannot use an index to create the index"));
26838 if (VEC_length (dwarf2_section_info_def, dwarf2_per_objfile->types) > 1)
26839 error (_("Cannot make an index when the file has multiple .debug_types sections"));
26841 if (!objfile->psymtabs || !objfile->psymtabs_addrmap)
26845 if (stat (objfile_name (objfile), &st) < 0)
26846 perror_with_name (objfile_name (objfile));
26848 std::string filename (std::string (dir) + SLASH_STRING
26849 + lbasename (objfile_name (objfile))
26850 + (index_kind == dw_index_kind::DEBUG_NAMES
26851 ? INDEX5_SUFFIX : INDEX4_SUFFIX));
26853 FILE *out_file = gdb_fopen_cloexec (filename.c_str (), "wb").release ();
26855 error (_("Can't open `%s' for writing"), filename.c_str ());
26857 /* Order matters here; we want FILE to be closed before FILENAME is
26858 unlinked, because on MS-Windows one cannot delete a file that is
26859 still open. (Don't call anything here that might throw until
26860 file_closer is created.) */
26861 gdb::unlinker unlink_file (filename.c_str ());
26862 gdb_file_up close_out_file (out_file);
26864 if (index_kind == dw_index_kind::DEBUG_NAMES)
26866 std::string filename_str (std::string (dir) + SLASH_STRING
26867 + lbasename (objfile_name (objfile))
26868 + DEBUG_STR_SUFFIX);
26870 = gdb_fopen_cloexec (filename_str.c_str (), "wb").release ();
26872 error (_("Can't open `%s' for writing"), filename_str.c_str ());
26873 gdb::unlinker unlink_file_str (filename_str.c_str ());
26874 gdb_file_up close_out_file_str (out_file_str);
26876 const size_t total_len
26877 = write_debug_names (objfile, out_file, out_file_str);
26878 assert_file_size (out_file, filename.c_str (), total_len);
26880 /* We want to keep the file .debug_str file too. */
26881 unlink_file_str.keep ();
26885 const size_t total_len
26886 = write_gdbindex (objfile, out_file);
26887 assert_file_size (out_file, filename.c_str (), total_len);
26890 /* We want to keep the file. */
26891 unlink_file.keep ();
26894 /* Implementation of the `save gdb-index' command.
26896 Note that the .gdb_index file format used by this command is
26897 documented in the GDB manual. Any changes here must be documented
26901 save_gdb_index_command (const char *arg, int from_tty)
26903 struct objfile *objfile;
26904 const char dwarf5space[] = "-dwarf-5 ";
26905 dw_index_kind index_kind = dw_index_kind::GDB_INDEX;
26910 arg = skip_spaces (arg);
26911 if (strncmp (arg, dwarf5space, strlen (dwarf5space)) == 0)
26913 index_kind = dw_index_kind::DEBUG_NAMES;
26914 arg += strlen (dwarf5space);
26915 arg = skip_spaces (arg);
26919 error (_("usage: save gdb-index [-dwarf-5] DIRECTORY"));
26921 ALL_OBJFILES (objfile)
26925 /* If the objfile does not correspond to an actual file, skip it. */
26926 if (stat (objfile_name (objfile), &st) < 0)
26930 = (struct dwarf2_per_objfile *) objfile_data (objfile,
26931 dwarf2_objfile_data_key);
26932 if (dwarf2_per_objfile)
26937 write_psymtabs_to_index (objfile, arg, index_kind);
26939 CATCH (except, RETURN_MASK_ERROR)
26941 exception_fprintf (gdb_stderr, except,
26942 _("Error while writing index for `%s': "),
26943 objfile_name (objfile));
26952 int dwarf_always_disassemble;
26955 show_dwarf_always_disassemble (struct ui_file *file, int from_tty,
26956 struct cmd_list_element *c, const char *value)
26958 fprintf_filtered (file,
26959 _("Whether to always disassemble "
26960 "DWARF expressions is %s.\n"),
26965 show_check_physname (struct ui_file *file, int from_tty,
26966 struct cmd_list_element *c, const char *value)
26968 fprintf_filtered (file,
26969 _("Whether to check \"physname\" is %s.\n"),
26974 _initialize_dwarf2_read (void)
26976 struct cmd_list_element *c;
26978 dwarf2_objfile_data_key
26979 = register_objfile_data_with_cleanup (NULL, dwarf2_per_objfile_free);
26981 add_prefix_cmd ("dwarf", class_maintenance, set_dwarf_cmd, _("\
26982 Set DWARF specific variables.\n\
26983 Configure DWARF variables such as the cache size"),
26984 &set_dwarf_cmdlist, "maintenance set dwarf ",
26985 0/*allow-unknown*/, &maintenance_set_cmdlist);
26987 add_prefix_cmd ("dwarf", class_maintenance, show_dwarf_cmd, _("\
26988 Show DWARF specific variables\n\
26989 Show DWARF variables such as the cache size"),
26990 &show_dwarf_cmdlist, "maintenance show dwarf ",
26991 0/*allow-unknown*/, &maintenance_show_cmdlist);
26993 add_setshow_zinteger_cmd ("max-cache-age", class_obscure,
26994 &dwarf_max_cache_age, _("\
26995 Set the upper bound on the age of cached DWARF compilation units."), _("\
26996 Show the upper bound on the age of cached DWARF compilation units."), _("\
26997 A higher limit means that cached compilation units will be stored\n\
26998 in memory longer, and more total memory will be used. Zero disables\n\
26999 caching, which can slow down startup."),
27001 show_dwarf_max_cache_age,
27002 &set_dwarf_cmdlist,
27003 &show_dwarf_cmdlist);
27005 add_setshow_boolean_cmd ("always-disassemble", class_obscure,
27006 &dwarf_always_disassemble, _("\
27007 Set whether `info address' always disassembles DWARF expressions."), _("\
27008 Show whether `info address' always disassembles DWARF expressions."), _("\
27009 When enabled, DWARF expressions are always printed in an assembly-like\n\
27010 syntax. When disabled, expressions will be printed in a more\n\
27011 conversational style, when possible."),
27013 show_dwarf_always_disassemble,
27014 &set_dwarf_cmdlist,
27015 &show_dwarf_cmdlist);
27017 add_setshow_zuinteger_cmd ("dwarf-read", no_class, &dwarf_read_debug, _("\
27018 Set debugging of the DWARF reader."), _("\
27019 Show debugging of the DWARF reader."), _("\
27020 When enabled (non-zero), debugging messages are printed during DWARF\n\
27021 reading and symtab expansion. A value of 1 (one) provides basic\n\
27022 information. A value greater than 1 provides more verbose information."),
27025 &setdebuglist, &showdebuglist);
27027 add_setshow_zuinteger_cmd ("dwarf-die", no_class, &dwarf_die_debug, _("\
27028 Set debugging of the DWARF DIE reader."), _("\
27029 Show debugging of the DWARF DIE reader."), _("\
27030 When enabled (non-zero), DIEs are dumped after they are read in.\n\
27031 The value is the maximum depth to print."),
27034 &setdebuglist, &showdebuglist);
27036 add_setshow_zuinteger_cmd ("dwarf-line", no_class, &dwarf_line_debug, _("\
27037 Set debugging of the dwarf line reader."), _("\
27038 Show debugging of the dwarf line reader."), _("\
27039 When enabled (non-zero), line number entries are dumped as they are read in.\n\
27040 A value of 1 (one) provides basic information.\n\
27041 A value greater than 1 provides more verbose information."),
27044 &setdebuglist, &showdebuglist);
27046 add_setshow_boolean_cmd ("check-physname", no_class, &check_physname, _("\
27047 Set cross-checking of \"physname\" code against demangler."), _("\
27048 Show cross-checking of \"physname\" code against demangler."), _("\
27049 When enabled, GDB's internal \"physname\" code is checked against\n\
27051 NULL, show_check_physname,
27052 &setdebuglist, &showdebuglist);
27054 add_setshow_boolean_cmd ("use-deprecated-index-sections",
27055 no_class, &use_deprecated_index_sections, _("\
27056 Set whether to use deprecated gdb_index sections."), _("\
27057 Show whether to use deprecated gdb_index sections."), _("\
27058 When enabled, deprecated .gdb_index sections are used anyway.\n\
27059 Normally they are ignored either because of a missing feature or\n\
27060 performance issue.\n\
27061 Warning: This option must be enabled before gdb reads the file."),
27064 &setlist, &showlist);
27066 c = add_cmd ("gdb-index", class_files, save_gdb_index_command,
27068 Save a gdb-index file.\n\
27069 Usage: save gdb-index [-dwarf-5] DIRECTORY\n\
27071 No options create one file with .gdb-index extension for pre-DWARF-5\n\
27072 compatible .gdb_index section. With -dwarf-5 creates two files with\n\
27073 extension .debug_names and .debug_str for DWARF-5 .debug_names section."),
27075 set_cmd_completer (c, filename_completer);
27077 dwarf2_locexpr_index = register_symbol_computed_impl (LOC_COMPUTED,
27078 &dwarf2_locexpr_funcs);
27079 dwarf2_loclist_index = register_symbol_computed_impl (LOC_COMPUTED,
27080 &dwarf2_loclist_funcs);
27082 dwarf2_locexpr_block_index = register_symbol_block_impl (LOC_BLOCK,
27083 &dwarf2_block_frame_base_locexpr_funcs);
27084 dwarf2_loclist_block_index = register_symbol_block_impl (LOC_BLOCK,
27085 &dwarf2_block_frame_base_loclist_funcs);
27088 selftests::register_test ("dw2_expand_symtabs_matching",
27089 selftests::dw2_expand_symtabs_matching::run_test);