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 "filename-seen-cache.h"
80 #include <sys/types.h>
82 #include <unordered_set>
83 #include <unordered_map>
86 /* When == 1, print basic high level tracing messages.
87 When > 1, be more verbose.
88 This is in contrast to the low level DIE reading of dwarf_die_debug. */
89 static unsigned int dwarf_read_debug = 0;
91 /* When non-zero, dump DIEs after they are read in. */
92 static unsigned int dwarf_die_debug = 0;
94 /* When non-zero, dump line number entries as they are read in. */
95 static unsigned int dwarf_line_debug = 0;
97 /* When non-zero, cross-check physname against demangler. */
98 static int check_physname = 0;
100 /* When non-zero, do not reject deprecated .gdb_index sections. */
101 static int use_deprecated_index_sections = 0;
103 static const struct objfile_data *dwarf2_objfile_data_key;
105 /* The "aclass" indices for various kinds of computed DWARF symbols. */
107 static int dwarf2_locexpr_index;
108 static int dwarf2_loclist_index;
109 static int dwarf2_locexpr_block_index;
110 static int dwarf2_loclist_block_index;
112 /* A descriptor for dwarf sections.
114 S.ASECTION, SIZE are typically initialized when the objfile is first
115 scanned. BUFFER, READIN are filled in later when the section is read.
116 If the section contained compressed data then SIZE is updated to record
117 the uncompressed size of the section.
119 DWP file format V2 introduces a wrinkle that is easiest to handle by
120 creating the concept of virtual sections contained within a real section.
121 In DWP V2 the sections of the input DWO files are concatenated together
122 into one section, but section offsets are kept relative to the original
124 If this is a virtual dwp-v2 section, S.CONTAINING_SECTION is a backlink to
125 the real section this "virtual" section is contained in, and BUFFER,SIZE
126 describe the virtual section. */
128 struct dwarf2_section_info
132 /* If this is a real section, the bfd section. */
134 /* If this is a virtual section, pointer to the containing ("real")
136 struct dwarf2_section_info *containing_section;
138 /* Pointer to section data, only valid if readin. */
139 const gdb_byte *buffer;
140 /* The size of the section, real or virtual. */
142 /* If this is a virtual section, the offset in the real section.
143 Only valid if is_virtual. */
144 bfd_size_type virtual_offset;
145 /* True if we have tried to read this section. */
147 /* True if this is a virtual section, False otherwise.
148 This specifies which of s.section and s.containing_section to use. */
152 typedef struct dwarf2_section_info dwarf2_section_info_def;
153 DEF_VEC_O (dwarf2_section_info_def);
155 /* All offsets in the index are of this type. It must be
156 architecture-independent. */
157 typedef uint32_t offset_type;
159 DEF_VEC_I (offset_type);
161 /* Ensure only legit values are used. */
162 #define DW2_GDB_INDEX_SYMBOL_STATIC_SET_VALUE(cu_index, value) \
164 gdb_assert ((unsigned int) (value) <= 1); \
165 GDB_INDEX_SYMBOL_STATIC_SET_VALUE((cu_index), (value)); \
168 /* Ensure only legit values are used. */
169 #define DW2_GDB_INDEX_SYMBOL_KIND_SET_VALUE(cu_index, value) \
171 gdb_assert ((value) >= GDB_INDEX_SYMBOL_KIND_TYPE \
172 && (value) <= GDB_INDEX_SYMBOL_KIND_OTHER); \
173 GDB_INDEX_SYMBOL_KIND_SET_VALUE((cu_index), (value)); \
176 /* Ensure we don't use more than the alloted nuber of bits for the CU. */
177 #define DW2_GDB_INDEX_CU_SET_VALUE(cu_index, value) \
179 gdb_assert (((value) & ~GDB_INDEX_CU_MASK) == 0); \
180 GDB_INDEX_CU_SET_VALUE((cu_index), (value)); \
185 /* Convert VALUE between big- and little-endian. */
188 byte_swap (offset_type value)
192 result = (value & 0xff) << 24;
193 result |= (value & 0xff00) << 8;
194 result |= (value & 0xff0000) >> 8;
195 result |= (value & 0xff000000) >> 24;
199 #define MAYBE_SWAP(V) byte_swap (V)
202 #define MAYBE_SWAP(V) static_cast<offset_type> (V)
203 #endif /* WORDS_BIGENDIAN */
205 /* An index into a (C++) symbol name component in a symbol name as
206 recorded in the mapped_index's symbol table. For each C++ symbol
207 in the symbol table, we record one entry for the start of each
208 component in the symbol in a table of name components, and then
209 sort the table, in order to be able to binary search symbol names,
210 ignoring leading namespaces, both completion and regular look up.
211 For example, for symbol "A::B::C", we'll have an entry that points
212 to "A::B::C", another that points to "B::C", and another for "C".
213 Note that function symbols in GDB index have no parameter
214 information, just the function/method names. You can convert a
215 name_component to a "const char *" using the
216 'mapped_index::symbol_name_at(offset_type)' method. */
218 struct name_component
220 /* Offset in the symbol name where the component starts. Stored as
221 a (32-bit) offset instead of a pointer to save memory and improve
222 locality on 64-bit architectures. */
223 offset_type name_offset;
225 /* The symbol's index in the symbol and constant pool tables of a
230 /* A description of the mapped index. The file format is described in
231 a comment by the code that writes the index. */
234 /* Index data format version. */
237 /* The total length of the buffer. */
240 /* A pointer to the address table data. */
241 const gdb_byte *address_table;
243 /* Size of the address table data in bytes. */
244 offset_type address_table_size;
246 /* The symbol table, implemented as a hash table. */
247 const offset_type *symbol_table;
249 /* Size in slots, each slot is 2 offset_types. */
250 offset_type symbol_table_slots;
252 /* A pointer to the constant pool. */
253 const char *constant_pool;
255 /* The name_component table (a sorted vector). See name_component's
256 description above. */
257 std::vector<name_component> name_components;
259 /* How NAME_COMPONENTS is sorted. */
260 enum case_sensitivity name_components_casing;
262 /* Convenience method to get at the name of the symbol at IDX in the
264 const char *symbol_name_at (offset_type idx) const
265 { return this->constant_pool + MAYBE_SWAP (this->symbol_table[idx]); }
267 /* Build the symbol name component sorted vector, if we haven't
269 void build_name_components ();
271 /* Returns the lower (inclusive) and upper (exclusive) bounds of the
272 possible matches for LN_NO_PARAMS in the name component
274 std::pair<std::vector<name_component>::const_iterator,
275 std::vector<name_component>::const_iterator>
276 find_name_components_bounds (const lookup_name_info &ln_no_params) const;
279 typedef struct dwarf2_per_cu_data *dwarf2_per_cu_ptr;
280 DEF_VEC_P (dwarf2_per_cu_ptr);
284 int nr_uniq_abbrev_tables;
286 int nr_symtab_sharers;
287 int nr_stmt_less_type_units;
288 int nr_all_type_units_reallocs;
291 /* Collection of data recorded per objfile.
292 This hangs off of dwarf2_objfile_data_key. */
294 struct dwarf2_per_objfile
296 /* Construct a dwarf2_per_objfile for OBJFILE. NAMES points to the
297 dwarf2 section names, or is NULL if the standard ELF names are
299 dwarf2_per_objfile (struct objfile *objfile,
300 const dwarf2_debug_sections *names);
302 ~dwarf2_per_objfile ();
304 DISABLE_COPY_AND_ASSIGN (dwarf2_per_objfile);
306 /* Free all cached compilation units. */
307 void free_cached_comp_units ();
309 /* This function is mapped across the sections and remembers the
310 offset and size of each of the debugging sections we are
312 void locate_sections (bfd *abfd, asection *sectp,
313 const dwarf2_debug_sections &names);
316 dwarf2_section_info info {};
317 dwarf2_section_info abbrev {};
318 dwarf2_section_info line {};
319 dwarf2_section_info loc {};
320 dwarf2_section_info loclists {};
321 dwarf2_section_info macinfo {};
322 dwarf2_section_info macro {};
323 dwarf2_section_info str {};
324 dwarf2_section_info line_str {};
325 dwarf2_section_info ranges {};
326 dwarf2_section_info rnglists {};
327 dwarf2_section_info addr {};
328 dwarf2_section_info frame {};
329 dwarf2_section_info eh_frame {};
330 dwarf2_section_info gdb_index {};
332 VEC (dwarf2_section_info_def) *types = NULL;
335 struct objfile *objfile = NULL;
337 /* Table of all the compilation units. This is used to locate
338 the target compilation unit of a particular reference. */
339 struct dwarf2_per_cu_data **all_comp_units = NULL;
341 /* The number of compilation units in ALL_COMP_UNITS. */
342 int n_comp_units = 0;
344 /* The number of .debug_types-related CUs. */
345 int n_type_units = 0;
347 /* The number of elements allocated in all_type_units.
348 If there are skeleton-less TUs, we add them to all_type_units lazily. */
349 int n_allocated_type_units = 0;
351 /* The .debug_types-related CUs (TUs).
352 This is stored in malloc space because we may realloc it. */
353 struct signatured_type **all_type_units = NULL;
355 /* Table of struct type_unit_group objects.
356 The hash key is the DW_AT_stmt_list value. */
357 htab_t type_unit_groups {};
359 /* A table mapping .debug_types signatures to its signatured_type entry.
360 This is NULL if the .debug_types section hasn't been read in yet. */
361 htab_t signatured_types {};
363 /* Type unit statistics, to see how well the scaling improvements
365 struct tu_stats tu_stats {};
367 /* A chain of compilation units that are currently read in, so that
368 they can be freed later. */
369 dwarf2_per_cu_data *read_in_chain = NULL;
371 /* A table mapping DW_AT_dwo_name values to struct dwo_file objects.
372 This is NULL if the table hasn't been allocated yet. */
375 /* True if we've checked for whether there is a DWP file. */
376 bool dwp_checked = false;
378 /* The DWP file if there is one, or NULL. */
379 struct dwp_file *dwp_file = NULL;
381 /* The shared '.dwz' file, if one exists. This is used when the
382 original data was compressed using 'dwz -m'. */
383 struct dwz_file *dwz_file = NULL;
385 /* A flag indicating whether this objfile has a section loaded at a
387 bool has_section_at_zero = false;
389 /* True if we are using the mapped index,
390 or we are faking it for OBJF_READNOW's sake. */
391 bool using_index = false;
393 /* The mapped index, or NULL if .gdb_index is missing or not being used. */
394 mapped_index *index_table = NULL;
396 /* When using index_table, this keeps track of all quick_file_names entries.
397 TUs typically share line table entries with a CU, so we maintain a
398 separate table of all line table entries to support the sharing.
399 Note that while there can be way more TUs than CUs, we've already
400 sorted all the TUs into "type unit groups", grouped by their
401 DW_AT_stmt_list value. Therefore the only sharing done here is with a
402 CU and its associated TU group if there is one. */
403 htab_t quick_file_names_table {};
405 /* Set during partial symbol reading, to prevent queueing of full
407 bool reading_partial_symbols = false;
409 /* Table mapping type DIEs to their struct type *.
410 This is NULL if not allocated yet.
411 The mapping is done via (CU/TU + DIE offset) -> type. */
412 htab_t die_type_hash {};
414 /* The CUs we recently read. */
415 VEC (dwarf2_per_cu_ptr) *just_read_cus = NULL;
417 /* Table containing line_header indexed by offset and offset_in_dwz. */
418 htab_t line_header_hash {};
420 /* Table containing all filenames. This is an optional because the
421 table is lazily constructed on first access. */
422 gdb::optional<filename_seen_cache> filenames_cache;
425 static struct dwarf2_per_objfile *dwarf2_per_objfile;
427 /* Default names of the debugging sections. */
429 /* Note that if the debugging section has been compressed, it might
430 have a name like .zdebug_info. */
432 static const struct dwarf2_debug_sections dwarf2_elf_names =
434 { ".debug_info", ".zdebug_info" },
435 { ".debug_abbrev", ".zdebug_abbrev" },
436 { ".debug_line", ".zdebug_line" },
437 { ".debug_loc", ".zdebug_loc" },
438 { ".debug_loclists", ".zdebug_loclists" },
439 { ".debug_macinfo", ".zdebug_macinfo" },
440 { ".debug_macro", ".zdebug_macro" },
441 { ".debug_str", ".zdebug_str" },
442 { ".debug_line_str", ".zdebug_line_str" },
443 { ".debug_ranges", ".zdebug_ranges" },
444 { ".debug_rnglists", ".zdebug_rnglists" },
445 { ".debug_types", ".zdebug_types" },
446 { ".debug_addr", ".zdebug_addr" },
447 { ".debug_frame", ".zdebug_frame" },
448 { ".eh_frame", NULL },
449 { ".gdb_index", ".zgdb_index" },
453 /* List of DWO/DWP sections. */
455 static const struct dwop_section_names
457 struct dwarf2_section_names abbrev_dwo;
458 struct dwarf2_section_names info_dwo;
459 struct dwarf2_section_names line_dwo;
460 struct dwarf2_section_names loc_dwo;
461 struct dwarf2_section_names loclists_dwo;
462 struct dwarf2_section_names macinfo_dwo;
463 struct dwarf2_section_names macro_dwo;
464 struct dwarf2_section_names str_dwo;
465 struct dwarf2_section_names str_offsets_dwo;
466 struct dwarf2_section_names types_dwo;
467 struct dwarf2_section_names cu_index;
468 struct dwarf2_section_names tu_index;
472 { ".debug_abbrev.dwo", ".zdebug_abbrev.dwo" },
473 { ".debug_info.dwo", ".zdebug_info.dwo" },
474 { ".debug_line.dwo", ".zdebug_line.dwo" },
475 { ".debug_loc.dwo", ".zdebug_loc.dwo" },
476 { ".debug_loclists.dwo", ".zdebug_loclists.dwo" },
477 { ".debug_macinfo.dwo", ".zdebug_macinfo.dwo" },
478 { ".debug_macro.dwo", ".zdebug_macro.dwo" },
479 { ".debug_str.dwo", ".zdebug_str.dwo" },
480 { ".debug_str_offsets.dwo", ".zdebug_str_offsets.dwo" },
481 { ".debug_types.dwo", ".zdebug_types.dwo" },
482 { ".debug_cu_index", ".zdebug_cu_index" },
483 { ".debug_tu_index", ".zdebug_tu_index" },
486 /* local data types */
488 /* The data in a compilation unit header, after target2host
489 translation, looks like this. */
490 struct comp_unit_head
494 unsigned char addr_size;
495 unsigned char signed_addr_p;
496 sect_offset abbrev_sect_off;
498 /* Size of file offsets; either 4 or 8. */
499 unsigned int offset_size;
501 /* Size of the length field; either 4 or 12. */
502 unsigned int initial_length_size;
504 enum dwarf_unit_type unit_type;
506 /* Offset to the first byte of this compilation unit header in the
507 .debug_info section, for resolving relative reference dies. */
508 sect_offset sect_off;
510 /* Offset to first die in this cu from the start of the cu.
511 This will be the first byte following the compilation unit header. */
512 cu_offset first_die_cu_offset;
514 /* 64-bit signature of this type unit - it is valid only for
515 UNIT_TYPE DW_UT_type. */
518 /* For types, offset in the type's DIE of the type defined by this TU. */
519 cu_offset type_cu_offset_in_tu;
522 /* Type used for delaying computation of method physnames.
523 See comments for compute_delayed_physnames. */
524 struct delayed_method_info
526 /* The type to which the method is attached, i.e., its parent class. */
529 /* The index of the method in the type's function fieldlists. */
532 /* The index of the method in the fieldlist. */
535 /* The name of the DIE. */
538 /* The DIE associated with this method. */
539 struct die_info *die;
542 typedef struct delayed_method_info delayed_method_info;
543 DEF_VEC_O (delayed_method_info);
545 /* Internal state when decoding a particular compilation unit. */
548 /* The objfile containing this compilation unit. */
549 struct objfile *objfile;
551 /* The header of the compilation unit. */
552 struct comp_unit_head header;
554 /* Base address of this compilation unit. */
555 CORE_ADDR base_address;
557 /* Non-zero if base_address has been set. */
560 /* The language we are debugging. */
561 enum language language;
562 const struct language_defn *language_defn;
564 const char *producer;
566 /* The generic symbol table building routines have separate lists for
567 file scope symbols and all all other scopes (local scopes). So
568 we need to select the right one to pass to add_symbol_to_list().
569 We do it by keeping a pointer to the correct list in list_in_scope.
571 FIXME: The original dwarf code just treated the file scope as the
572 first local scope, and all other local scopes as nested local
573 scopes, and worked fine. Check to see if we really need to
574 distinguish these in buildsym.c. */
575 struct pending **list_in_scope;
577 /* The abbrev table for this CU.
578 Normally this points to the abbrev table in the objfile.
579 But if DWO_UNIT is non-NULL this is the abbrev table in the DWO file. */
580 struct abbrev_table *abbrev_table;
582 /* Hash table holding all the loaded partial DIEs
583 with partial_die->offset.SECT_OFF as hash. */
586 /* Storage for things with the same lifetime as this read-in compilation
587 unit, including partial DIEs. */
588 struct obstack comp_unit_obstack;
590 /* When multiple dwarf2_cu structures are living in memory, this field
591 chains them all together, so that they can be released efficiently.
592 We will probably also want a generation counter so that most-recently-used
593 compilation units are cached... */
594 struct dwarf2_per_cu_data *read_in_chain;
596 /* Backlink to our per_cu entry. */
597 struct dwarf2_per_cu_data *per_cu;
599 /* How many compilation units ago was this CU last referenced? */
602 /* A hash table of DIE cu_offset for following references with
603 die_info->offset.sect_off as hash. */
606 /* Full DIEs if read in. */
607 struct die_info *dies;
609 /* A set of pointers to dwarf2_per_cu_data objects for compilation
610 units referenced by this one. Only set during full symbol processing;
611 partial symbol tables do not have dependencies. */
614 /* Header data from the line table, during full symbol processing. */
615 struct line_header *line_header;
616 /* Non-NULL if LINE_HEADER is owned by this DWARF_CU. Otherwise,
617 it's owned by dwarf2_per_objfile::line_header_hash. If non-NULL,
618 this is the DW_TAG_compile_unit die for this CU. We'll hold on
619 to the line header as long as this DIE is being processed. See
620 process_die_scope. */
621 die_info *line_header_die_owner;
623 /* A list of methods which need to have physnames computed
624 after all type information has been read. */
625 VEC (delayed_method_info) *method_list;
627 /* To be copied to symtab->call_site_htab. */
628 htab_t call_site_htab;
630 /* Non-NULL if this CU came from a DWO file.
631 There is an invariant here that is important to remember:
632 Except for attributes copied from the top level DIE in the "main"
633 (or "stub") file in preparation for reading the DWO file
634 (e.g., DW_AT_GNU_addr_base), we KISS: there is only *one* CU.
635 Either there isn't a DWO file (in which case this is NULL and the point
636 is moot), or there is and either we're not going to read it (in which
637 case this is NULL) or there is and we are reading it (in which case this
639 struct dwo_unit *dwo_unit;
641 /* The DW_AT_addr_base attribute if present, zero otherwise
642 (zero is a valid value though).
643 Note this value comes from the Fission stub CU/TU's DIE. */
646 /* The DW_AT_ranges_base attribute if present, zero otherwise
647 (zero is a valid value though).
648 Note this value comes from the Fission stub CU/TU's DIE.
649 Also note that the value is zero in the non-DWO case so this value can
650 be used without needing to know whether DWO files are in use or not.
651 N.B. This does not apply to DW_AT_ranges appearing in
652 DW_TAG_compile_unit dies. This is a bit of a wart, consider if ever
653 DW_AT_ranges appeared in the DW_TAG_compile_unit of DWO DIEs: then
654 DW_AT_ranges_base *would* have to be applied, and we'd have to care
655 whether the DW_AT_ranges attribute came from the skeleton or DWO. */
656 ULONGEST ranges_base;
658 /* Mark used when releasing cached dies. */
659 unsigned int mark : 1;
661 /* This CU references .debug_loc. See the symtab->locations_valid field.
662 This test is imperfect as there may exist optimized debug code not using
663 any location list and still facing inlining issues if handled as
664 unoptimized code. For a future better test see GCC PR other/32998. */
665 unsigned int has_loclist : 1;
667 /* These cache the results for producer_is_* fields. CHECKED_PRODUCER is set
668 if all the producer_is_* fields are valid. This information is cached
669 because profiling CU expansion showed excessive time spent in
670 producer_is_gxx_lt_4_6. */
671 unsigned int checked_producer : 1;
672 unsigned int producer_is_gxx_lt_4_6 : 1;
673 unsigned int producer_is_gcc_lt_4_3 : 1;
674 unsigned int producer_is_icc_lt_14 : 1;
676 /* When set, the file that we're processing is known to have
677 debugging info for C++ namespaces. GCC 3.3.x did not produce
678 this information, but later versions do. */
680 unsigned int processing_has_namespace_info : 1;
683 /* Persistent data held for a compilation unit, even when not
684 processing it. We put a pointer to this structure in the
685 read_symtab_private field of the psymtab. */
687 struct dwarf2_per_cu_data
689 /* The start offset and length of this compilation unit.
690 NOTE: Unlike comp_unit_head.length, this length includes
692 If the DIE refers to a DWO file, this is always of the original die,
694 sect_offset sect_off;
697 /* DWARF standard version this data has been read from (such as 4 or 5). */
700 /* Flag indicating this compilation unit will be read in before
701 any of the current compilation units are processed. */
702 unsigned int queued : 1;
704 /* This flag will be set when reading partial DIEs if we need to load
705 absolutely all DIEs for this compilation unit, instead of just the ones
706 we think are interesting. It gets set if we look for a DIE in the
707 hash table and don't find it. */
708 unsigned int load_all_dies : 1;
710 /* Non-zero if this CU is from .debug_types.
711 Struct dwarf2_per_cu_data is contained in struct signatured_type iff
713 unsigned int is_debug_types : 1;
715 /* Non-zero if this CU is from the .dwz file. */
716 unsigned int is_dwz : 1;
718 /* Non-zero if reading a TU directly from a DWO file, bypassing the stub.
719 This flag is only valid if is_debug_types is true.
720 We can't read a CU directly from a DWO file: There are required
721 attributes in the stub. */
722 unsigned int reading_dwo_directly : 1;
724 /* Non-zero if the TU has been read.
725 This is used to assist the "Stay in DWO Optimization" for Fission:
726 When reading a DWO, it's faster to read TUs from the DWO instead of
727 fetching them from random other DWOs (due to comdat folding).
728 If the TU has already been read, the optimization is unnecessary
729 (and unwise - we don't want to change where gdb thinks the TU lives
731 This flag is only valid if is_debug_types is true. */
732 unsigned int tu_read : 1;
734 /* The section this CU/TU lives in.
735 If the DIE refers to a DWO file, this is always the original die,
737 struct dwarf2_section_info *section;
739 /* Set to non-NULL iff this CU is currently loaded. When it gets freed out
740 of the CU cache it gets reset to NULL again. This is left as NULL for
741 dummy CUs (a CU header, but nothing else). */
742 struct dwarf2_cu *cu;
744 /* The corresponding objfile.
745 Normally we can get the objfile from dwarf2_per_objfile.
746 However we can enter this file with just a "per_cu" handle. */
747 struct objfile *objfile;
749 /* When dwarf2_per_objfile->using_index is true, the 'quick' field
750 is active. Otherwise, the 'psymtab' field is active. */
753 /* The partial symbol table associated with this compilation unit,
754 or NULL for unread partial units. */
755 struct partial_symtab *psymtab;
757 /* Data needed by the "quick" functions. */
758 struct dwarf2_per_cu_quick_data *quick;
761 /* The CUs we import using DW_TAG_imported_unit. This is filled in
762 while reading psymtabs, used to compute the psymtab dependencies,
763 and then cleared. Then it is filled in again while reading full
764 symbols, and only deleted when the objfile is destroyed.
766 This is also used to work around a difference between the way gold
767 generates .gdb_index version <=7 and the way gdb does. Arguably this
768 is a gold bug. For symbols coming from TUs, gold records in the index
769 the CU that includes the TU instead of the TU itself. This breaks
770 dw2_lookup_symbol: It assumes that if the index says symbol X lives
771 in CU/TU Y, then one need only expand Y and a subsequent lookup in Y
772 will find X. Alas TUs live in their own symtab, so after expanding CU Y
773 we need to look in TU Z to find X. Fortunately, this is akin to
774 DW_TAG_imported_unit, so we just use the same mechanism: For
775 .gdb_index version <=7 this also records the TUs that the CU referred
776 to. Concurrently with this change gdb was modified to emit version 8
777 indices so we only pay a price for gold generated indices.
778 http://sourceware.org/bugzilla/show_bug.cgi?id=15021. */
779 VEC (dwarf2_per_cu_ptr) *imported_symtabs;
782 /* Entry in the signatured_types hash table. */
784 struct signatured_type
786 /* The "per_cu" object of this type.
787 This struct is used iff per_cu.is_debug_types.
788 N.B.: This is the first member so that it's easy to convert pointers
790 struct dwarf2_per_cu_data per_cu;
792 /* The type's signature. */
795 /* Offset in the TU of the type's DIE, as read from the TU header.
796 If this TU is a DWO stub and the definition lives in a DWO file
797 (specified by DW_AT_GNU_dwo_name), this value is unusable. */
798 cu_offset type_offset_in_tu;
800 /* Offset in the section of the type's DIE.
801 If the definition lives in a DWO file, this is the offset in the
802 .debug_types.dwo section.
803 The value is zero until the actual value is known.
804 Zero is otherwise not a valid section offset. */
805 sect_offset type_offset_in_section;
807 /* Type units are grouped by their DW_AT_stmt_list entry so that they
808 can share them. This points to the containing symtab. */
809 struct type_unit_group *type_unit_group;
812 The first time we encounter this type we fully read it in and install it
813 in the symbol tables. Subsequent times we only need the type. */
816 /* Containing DWO unit.
817 This field is valid iff per_cu.reading_dwo_directly. */
818 struct dwo_unit *dwo_unit;
821 typedef struct signatured_type *sig_type_ptr;
822 DEF_VEC_P (sig_type_ptr);
824 /* A struct that can be used as a hash key for tables based on DW_AT_stmt_list.
825 This includes type_unit_group and quick_file_names. */
827 struct stmt_list_hash
829 /* The DWO unit this table is from or NULL if there is none. */
830 struct dwo_unit *dwo_unit;
832 /* Offset in .debug_line or .debug_line.dwo. */
833 sect_offset line_sect_off;
836 /* Each element of dwarf2_per_objfile->type_unit_groups is a pointer to
837 an object of this type. */
839 struct type_unit_group
841 /* dwarf2read.c's main "handle" on a TU symtab.
842 To simplify things we create an artificial CU that "includes" all the
843 type units using this stmt_list so that the rest of the code still has
844 a "per_cu" handle on the symtab.
845 This PER_CU is recognized by having no section. */
846 #define IS_TYPE_UNIT_GROUP(per_cu) ((per_cu)->section == NULL)
847 struct dwarf2_per_cu_data per_cu;
849 /* The TUs that share this DW_AT_stmt_list entry.
850 This is added to while parsing type units to build partial symtabs,
851 and is deleted afterwards and not used again. */
852 VEC (sig_type_ptr) *tus;
854 /* The compunit symtab.
855 Type units in a group needn't all be defined in the same source file,
856 so we create an essentially anonymous symtab as the compunit symtab. */
857 struct compunit_symtab *compunit_symtab;
859 /* The data used to construct the hash key. */
860 struct stmt_list_hash hash;
862 /* The number of symtabs from the line header.
863 The value here must match line_header.num_file_names. */
864 unsigned int num_symtabs;
866 /* The symbol tables for this TU (obtained from the files listed in
868 WARNING: The order of entries here must match the order of entries
869 in the line header. After the first TU using this type_unit_group, the
870 line header for the subsequent TUs is recreated from this. This is done
871 because we need to use the same symtabs for each TU using the same
872 DW_AT_stmt_list value. Also note that symtabs may be repeated here,
873 there's no guarantee the line header doesn't have duplicate entries. */
874 struct symtab **symtabs;
877 /* These sections are what may appear in a (real or virtual) DWO file. */
881 struct dwarf2_section_info abbrev;
882 struct dwarf2_section_info line;
883 struct dwarf2_section_info loc;
884 struct dwarf2_section_info loclists;
885 struct dwarf2_section_info macinfo;
886 struct dwarf2_section_info macro;
887 struct dwarf2_section_info str;
888 struct dwarf2_section_info str_offsets;
889 /* In the case of a virtual DWO file, these two are unused. */
890 struct dwarf2_section_info info;
891 VEC (dwarf2_section_info_def) *types;
894 /* CUs/TUs in DWP/DWO files. */
898 /* Backlink to the containing struct dwo_file. */
899 struct dwo_file *dwo_file;
901 /* The "id" that distinguishes this CU/TU.
902 .debug_info calls this "dwo_id", .debug_types calls this "signature".
903 Since signatures came first, we stick with it for consistency. */
906 /* The section this CU/TU lives in, in the DWO file. */
907 struct dwarf2_section_info *section;
909 /* Same as dwarf2_per_cu_data:{sect_off,length} but in the DWO section. */
910 sect_offset sect_off;
913 /* For types, offset in the type's DIE of the type defined by this TU. */
914 cu_offset type_offset_in_tu;
917 /* include/dwarf2.h defines the DWP section codes.
918 It defines a max value but it doesn't define a min value, which we
919 use for error checking, so provide one. */
921 enum dwp_v2_section_ids
926 /* Data for one DWO file.
928 This includes virtual DWO files (a virtual DWO file is a DWO file as it
929 appears in a DWP file). DWP files don't really have DWO files per se -
930 comdat folding of types "loses" the DWO file they came from, and from
931 a high level view DWP files appear to contain a mass of random types.
932 However, to maintain consistency with the non-DWP case we pretend DWP
933 files contain virtual DWO files, and we assign each TU with one virtual
934 DWO file (generally based on the line and abbrev section offsets -
935 a heuristic that seems to work in practice). */
939 /* The DW_AT_GNU_dwo_name attribute.
940 For virtual DWO files the name is constructed from the section offsets
941 of abbrev,line,loc,str_offsets so that we combine virtual DWO files
942 from related CU+TUs. */
943 const char *dwo_name;
945 /* The DW_AT_comp_dir attribute. */
946 const char *comp_dir;
948 /* The bfd, when the file is open. Otherwise this is NULL.
949 This is unused(NULL) for virtual DWO files where we use dwp_file.dbfd. */
952 /* The sections that make up this DWO file.
953 Remember that for virtual DWO files in DWP V2, these are virtual
954 sections (for lack of a better name). */
955 struct dwo_sections sections;
957 /* The CUs in the file.
958 Each element is a struct dwo_unit. Multiple CUs per DWO are supported as
959 an extension to handle LLVM's Link Time Optimization output (where
960 multiple source files may be compiled into a single object/dwo pair). */
963 /* Table of TUs in the file.
964 Each element is a struct dwo_unit. */
968 /* These sections are what may appear in a DWP file. */
972 /* These are used by both DWP version 1 and 2. */
973 struct dwarf2_section_info str;
974 struct dwarf2_section_info cu_index;
975 struct dwarf2_section_info tu_index;
977 /* These are only used by DWP version 2 files.
978 In DWP version 1 the .debug_info.dwo, .debug_types.dwo, and other
979 sections are referenced by section number, and are not recorded here.
980 In DWP version 2 there is at most one copy of all these sections, each
981 section being (effectively) comprised of the concatenation of all of the
982 individual sections that exist in the version 1 format.
983 To keep the code simple we treat each of these concatenated pieces as a
984 section itself (a virtual section?). */
985 struct dwarf2_section_info abbrev;
986 struct dwarf2_section_info info;
987 struct dwarf2_section_info line;
988 struct dwarf2_section_info loc;
989 struct dwarf2_section_info macinfo;
990 struct dwarf2_section_info macro;
991 struct dwarf2_section_info str_offsets;
992 struct dwarf2_section_info types;
995 /* These sections are what may appear in a virtual DWO file in DWP version 1.
996 A virtual DWO file is a DWO file as it appears in a DWP file. */
998 struct virtual_v1_dwo_sections
1000 struct dwarf2_section_info abbrev;
1001 struct dwarf2_section_info line;
1002 struct dwarf2_section_info loc;
1003 struct dwarf2_section_info macinfo;
1004 struct dwarf2_section_info macro;
1005 struct dwarf2_section_info str_offsets;
1006 /* Each DWP hash table entry records one CU or one TU.
1007 That is recorded here, and copied to dwo_unit.section. */
1008 struct dwarf2_section_info info_or_types;
1011 /* Similar to virtual_v1_dwo_sections, but for DWP version 2.
1012 In version 2, the sections of the DWO files are concatenated together
1013 and stored in one section of that name. Thus each ELF section contains
1014 several "virtual" sections. */
1016 struct virtual_v2_dwo_sections
1018 bfd_size_type abbrev_offset;
1019 bfd_size_type abbrev_size;
1021 bfd_size_type line_offset;
1022 bfd_size_type line_size;
1024 bfd_size_type loc_offset;
1025 bfd_size_type loc_size;
1027 bfd_size_type macinfo_offset;
1028 bfd_size_type macinfo_size;
1030 bfd_size_type macro_offset;
1031 bfd_size_type macro_size;
1033 bfd_size_type str_offsets_offset;
1034 bfd_size_type str_offsets_size;
1036 /* Each DWP hash table entry records one CU or one TU.
1037 That is recorded here, and copied to dwo_unit.section. */
1038 bfd_size_type info_or_types_offset;
1039 bfd_size_type info_or_types_size;
1042 /* Contents of DWP hash tables. */
1044 struct dwp_hash_table
1046 uint32_t version, nr_columns;
1047 uint32_t nr_units, nr_slots;
1048 const gdb_byte *hash_table, *unit_table;
1053 const gdb_byte *indices;
1057 /* This is indexed by column number and gives the id of the section
1059 #define MAX_NR_V2_DWO_SECTIONS \
1060 (1 /* .debug_info or .debug_types */ \
1061 + 1 /* .debug_abbrev */ \
1062 + 1 /* .debug_line */ \
1063 + 1 /* .debug_loc */ \
1064 + 1 /* .debug_str_offsets */ \
1065 + 1 /* .debug_macro or .debug_macinfo */)
1066 int section_ids[MAX_NR_V2_DWO_SECTIONS];
1067 const gdb_byte *offsets;
1068 const gdb_byte *sizes;
1073 /* Data for one DWP file. */
1077 /* Name of the file. */
1080 /* File format version. */
1086 /* Section info for this file. */
1087 struct dwp_sections sections;
1089 /* Table of CUs in the file. */
1090 const struct dwp_hash_table *cus;
1092 /* Table of TUs in the file. */
1093 const struct dwp_hash_table *tus;
1095 /* Tables of loaded CUs/TUs. Each entry is a struct dwo_unit *. */
1099 /* Table to map ELF section numbers to their sections.
1100 This is only needed for the DWP V1 file format. */
1101 unsigned int num_sections;
1102 asection **elf_sections;
1105 /* This represents a '.dwz' file. */
1109 /* A dwz file can only contain a few sections. */
1110 struct dwarf2_section_info abbrev;
1111 struct dwarf2_section_info info;
1112 struct dwarf2_section_info str;
1113 struct dwarf2_section_info line;
1114 struct dwarf2_section_info macro;
1115 struct dwarf2_section_info gdb_index;
1117 /* The dwz's BFD. */
1121 /* Struct used to pass misc. parameters to read_die_and_children, et
1122 al. which are used for both .debug_info and .debug_types dies.
1123 All parameters here are unchanging for the life of the call. This
1124 struct exists to abstract away the constant parameters of die reading. */
1126 struct die_reader_specs
1128 /* The bfd of die_section. */
1131 /* The CU of the DIE we are parsing. */
1132 struct dwarf2_cu *cu;
1134 /* Non-NULL if reading a DWO file (including one packaged into a DWP). */
1135 struct dwo_file *dwo_file;
1137 /* The section the die comes from.
1138 This is either .debug_info or .debug_types, or the .dwo variants. */
1139 struct dwarf2_section_info *die_section;
1141 /* die_section->buffer. */
1142 const gdb_byte *buffer;
1144 /* The end of the buffer. */
1145 const gdb_byte *buffer_end;
1147 /* The value of the DW_AT_comp_dir attribute. */
1148 const char *comp_dir;
1151 /* Type of function passed to init_cutu_and_read_dies, et.al. */
1152 typedef void (die_reader_func_ftype) (const struct die_reader_specs *reader,
1153 const gdb_byte *info_ptr,
1154 struct die_info *comp_unit_die,
1158 /* A 1-based directory index. This is a strong typedef to prevent
1159 accidentally using a directory index as a 0-based index into an
1161 enum class dir_index : unsigned int {};
1163 /* Likewise, a 1-based file name index. */
1164 enum class file_name_index : unsigned int {};
1168 file_entry () = default;
1170 file_entry (const char *name_, dir_index d_index_,
1171 unsigned int mod_time_, unsigned int length_)
1174 mod_time (mod_time_),
1178 /* Return the include directory at D_INDEX stored in LH. Returns
1179 NULL if D_INDEX is out of bounds. */
1180 const char *include_dir (const line_header *lh) const;
1182 /* The file name. Note this is an observing pointer. The memory is
1183 owned by debug_line_buffer. */
1184 const char *name {};
1186 /* The directory index (1-based). */
1187 dir_index d_index {};
1189 unsigned int mod_time {};
1191 unsigned int length {};
1193 /* True if referenced by the Line Number Program. */
1196 /* The associated symbol table, if any. */
1197 struct symtab *symtab {};
1200 /* The line number information for a compilation unit (found in the
1201 .debug_line section) begins with a "statement program header",
1202 which contains the following information. */
1209 /* Add an entry to the include directory table. */
1210 void add_include_dir (const char *include_dir);
1212 /* Add an entry to the file name table. */
1213 void add_file_name (const char *name, dir_index d_index,
1214 unsigned int mod_time, unsigned int length);
1216 /* Return the include dir at INDEX (1-based). Returns NULL if INDEX
1217 is out of bounds. */
1218 const char *include_dir_at (dir_index index) const
1220 /* Convert directory index number (1-based) to vector index
1222 size_t vec_index = to_underlying (index) - 1;
1224 if (vec_index >= include_dirs.size ())
1226 return include_dirs[vec_index];
1229 /* Return the file name at INDEX (1-based). Returns NULL if INDEX
1230 is out of bounds. */
1231 file_entry *file_name_at (file_name_index index)
1233 /* Convert file name index number (1-based) to vector index
1235 size_t vec_index = to_underlying (index) - 1;
1237 if (vec_index >= file_names.size ())
1239 return &file_names[vec_index];
1242 /* Const version of the above. */
1243 const file_entry *file_name_at (unsigned int index) const
1245 if (index >= file_names.size ())
1247 return &file_names[index];
1250 /* Offset of line number information in .debug_line section. */
1251 sect_offset sect_off {};
1253 /* OFFSET is for struct dwz_file associated with dwarf2_per_objfile. */
1254 unsigned offset_in_dwz : 1; /* Can't initialize bitfields in-class. */
1256 unsigned int total_length {};
1257 unsigned short version {};
1258 unsigned int header_length {};
1259 unsigned char minimum_instruction_length {};
1260 unsigned char maximum_ops_per_instruction {};
1261 unsigned char default_is_stmt {};
1263 unsigned char line_range {};
1264 unsigned char opcode_base {};
1266 /* standard_opcode_lengths[i] is the number of operands for the
1267 standard opcode whose value is i. This means that
1268 standard_opcode_lengths[0] is unused, and the last meaningful
1269 element is standard_opcode_lengths[opcode_base - 1]. */
1270 std::unique_ptr<unsigned char[]> standard_opcode_lengths;
1272 /* The include_directories table. Note these are observing
1273 pointers. The memory is owned by debug_line_buffer. */
1274 std::vector<const char *> include_dirs;
1276 /* The file_names table. */
1277 std::vector<file_entry> file_names;
1279 /* The start and end of the statement program following this
1280 header. These point into dwarf2_per_objfile->line_buffer. */
1281 const gdb_byte *statement_program_start {}, *statement_program_end {};
1284 typedef std::unique_ptr<line_header> line_header_up;
1287 file_entry::include_dir (const line_header *lh) const
1289 return lh->include_dir_at (d_index);
1292 /* When we construct a partial symbol table entry we only
1293 need this much information. */
1294 struct partial_die_info
1296 /* Offset of this DIE. */
1297 sect_offset sect_off;
1299 /* DWARF-2 tag for this DIE. */
1300 ENUM_BITFIELD(dwarf_tag) tag : 16;
1302 /* Assorted flags describing the data found in this DIE. */
1303 unsigned int has_children : 1;
1304 unsigned int is_external : 1;
1305 unsigned int is_declaration : 1;
1306 unsigned int has_type : 1;
1307 unsigned int has_specification : 1;
1308 unsigned int has_pc_info : 1;
1309 unsigned int may_be_inlined : 1;
1311 /* This DIE has been marked DW_AT_main_subprogram. */
1312 unsigned int main_subprogram : 1;
1314 /* Flag set if the SCOPE field of this structure has been
1316 unsigned int scope_set : 1;
1318 /* Flag set if the DIE has a byte_size attribute. */
1319 unsigned int has_byte_size : 1;
1321 /* Flag set if the DIE has a DW_AT_const_value attribute. */
1322 unsigned int has_const_value : 1;
1324 /* Flag set if any of the DIE's children are template arguments. */
1325 unsigned int has_template_arguments : 1;
1327 /* Flag set if fixup_partial_die has been called on this die. */
1328 unsigned int fixup_called : 1;
1330 /* Flag set if DW_TAG_imported_unit uses DW_FORM_GNU_ref_alt. */
1331 unsigned int is_dwz : 1;
1333 /* Flag set if spec_offset uses DW_FORM_GNU_ref_alt. */
1334 unsigned int spec_is_dwz : 1;
1336 /* The name of this DIE. Normally the value of DW_AT_name, but
1337 sometimes a default name for unnamed DIEs. */
1340 /* The linkage name, if present. */
1341 const char *linkage_name;
1343 /* The scope to prepend to our children. This is generally
1344 allocated on the comp_unit_obstack, so will disappear
1345 when this compilation unit leaves the cache. */
1348 /* Some data associated with the partial DIE. The tag determines
1349 which field is live. */
1352 /* The location description associated with this DIE, if any. */
1353 struct dwarf_block *locdesc;
1354 /* The offset of an import, for DW_TAG_imported_unit. */
1355 sect_offset sect_off;
1358 /* If HAS_PC_INFO, the PC range associated with this DIE. */
1362 /* Pointer into the info_buffer (or types_buffer) pointing at the target of
1363 DW_AT_sibling, if any. */
1364 /* NOTE: This member isn't strictly necessary, read_partial_die could
1365 return DW_AT_sibling values to its caller load_partial_dies. */
1366 const gdb_byte *sibling;
1368 /* If HAS_SPECIFICATION, the offset of the DIE referred to by
1369 DW_AT_specification (or DW_AT_abstract_origin or
1370 DW_AT_extension). */
1371 sect_offset spec_offset;
1373 /* Pointers to this DIE's parent, first child, and next sibling,
1375 struct partial_die_info *die_parent, *die_child, *die_sibling;
1378 /* This data structure holds the information of an abbrev. */
1381 unsigned int number; /* number identifying abbrev */
1382 enum dwarf_tag tag; /* dwarf tag */
1383 unsigned short has_children; /* boolean */
1384 unsigned short num_attrs; /* number of attributes */
1385 struct attr_abbrev *attrs; /* an array of attribute descriptions */
1386 struct abbrev_info *next; /* next in chain */
1391 ENUM_BITFIELD(dwarf_attribute) name : 16;
1392 ENUM_BITFIELD(dwarf_form) form : 16;
1394 /* It is valid only if FORM is DW_FORM_implicit_const. */
1395 LONGEST implicit_const;
1398 /* Size of abbrev_table.abbrev_hash_table. */
1399 #define ABBREV_HASH_SIZE 121
1401 /* Top level data structure to contain an abbreviation table. */
1405 /* Where the abbrev table came from.
1406 This is used as a sanity check when the table is used. */
1407 sect_offset sect_off;
1409 /* Storage for the abbrev table. */
1410 struct obstack abbrev_obstack;
1412 /* Hash table of abbrevs.
1413 This is an array of size ABBREV_HASH_SIZE allocated in abbrev_obstack.
1414 It could be statically allocated, but the previous code didn't so we
1416 struct abbrev_info **abbrevs;
1419 /* Attributes have a name and a value. */
1422 ENUM_BITFIELD(dwarf_attribute) name : 16;
1423 ENUM_BITFIELD(dwarf_form) form : 15;
1425 /* Has DW_STRING already been updated by dwarf2_canonicalize_name? This
1426 field should be in u.str (existing only for DW_STRING) but it is kept
1427 here for better struct attribute alignment. */
1428 unsigned int string_is_canonical : 1;
1433 struct dwarf_block *blk;
1442 /* This data structure holds a complete die structure. */
1445 /* DWARF-2 tag for this DIE. */
1446 ENUM_BITFIELD(dwarf_tag) tag : 16;
1448 /* Number of attributes */
1449 unsigned char num_attrs;
1451 /* True if we're presently building the full type name for the
1452 type derived from this DIE. */
1453 unsigned char building_fullname : 1;
1455 /* True if this die is in process. PR 16581. */
1456 unsigned char in_process : 1;
1459 unsigned int abbrev;
1461 /* Offset in .debug_info or .debug_types section. */
1462 sect_offset sect_off;
1464 /* The dies in a compilation unit form an n-ary tree. PARENT
1465 points to this die's parent; CHILD points to the first child of
1466 this node; and all the children of a given node are chained
1467 together via their SIBLING fields. */
1468 struct die_info *child; /* Its first child, if any. */
1469 struct die_info *sibling; /* Its next sibling, if any. */
1470 struct die_info *parent; /* Its parent, if any. */
1472 /* An array of attributes, with NUM_ATTRS elements. There may be
1473 zero, but it's not common and zero-sized arrays are not
1474 sufficiently portable C. */
1475 struct attribute attrs[1];
1478 /* Get at parts of an attribute structure. */
1480 #define DW_STRING(attr) ((attr)->u.str)
1481 #define DW_STRING_IS_CANONICAL(attr) ((attr)->string_is_canonical)
1482 #define DW_UNSND(attr) ((attr)->u.unsnd)
1483 #define DW_BLOCK(attr) ((attr)->u.blk)
1484 #define DW_SND(attr) ((attr)->u.snd)
1485 #define DW_ADDR(attr) ((attr)->u.addr)
1486 #define DW_SIGNATURE(attr) ((attr)->u.signature)
1488 /* Blocks are a bunch of untyped bytes. */
1493 /* Valid only if SIZE is not zero. */
1494 const gdb_byte *data;
1497 #ifndef ATTR_ALLOC_CHUNK
1498 #define ATTR_ALLOC_CHUNK 4
1501 /* Allocate fields for structs, unions and enums in this size. */
1502 #ifndef DW_FIELD_ALLOC_CHUNK
1503 #define DW_FIELD_ALLOC_CHUNK 4
1506 /* FIXME: We might want to set this from BFD via bfd_arch_bits_per_byte,
1507 but this would require a corresponding change in unpack_field_as_long
1509 static int bits_per_byte = 8;
1513 struct nextfield *next;
1521 struct nextfnfield *next;
1522 struct fn_field fnfield;
1529 struct nextfnfield *head;
1532 struct typedef_field_list
1534 struct typedef_field field;
1535 struct typedef_field_list *next;
1538 /* The routines that read and process dies for a C struct or C++ class
1539 pass lists of data member fields and lists of member function fields
1540 in an instance of a field_info structure, as defined below. */
1543 /* List of data member and baseclasses fields. */
1544 struct nextfield *fields, *baseclasses;
1546 /* Number of fields (including baseclasses). */
1549 /* Number of baseclasses. */
1552 /* Set if the accesibility of one of the fields is not public. */
1553 int non_public_fields;
1555 /* Member function fieldlist array, contains name of possibly overloaded
1556 member function, number of overloaded member functions and a pointer
1557 to the head of the member function field chain. */
1558 struct fnfieldlist *fnfieldlists;
1560 /* Number of entries in the fnfieldlists array. */
1563 /* typedefs defined inside this class. TYPEDEF_FIELD_LIST contains head of
1564 a NULL terminated list of TYPEDEF_FIELD_LIST_COUNT elements. */
1565 struct typedef_field_list *typedef_field_list;
1566 unsigned typedef_field_list_count;
1569 /* One item on the queue of compilation units to read in full symbols
1571 struct dwarf2_queue_item
1573 struct dwarf2_per_cu_data *per_cu;
1574 enum language pretend_language;
1575 struct dwarf2_queue_item *next;
1578 /* The current queue. */
1579 static struct dwarf2_queue_item *dwarf2_queue, *dwarf2_queue_tail;
1581 /* Loaded secondary compilation units are kept in memory until they
1582 have not been referenced for the processing of this many
1583 compilation units. Set this to zero to disable caching. Cache
1584 sizes of up to at least twenty will improve startup time for
1585 typical inter-CU-reference binaries, at an obvious memory cost. */
1586 static int dwarf_max_cache_age = 5;
1588 show_dwarf_max_cache_age (struct ui_file *file, int from_tty,
1589 struct cmd_list_element *c, const char *value)
1591 fprintf_filtered (file, _("The upper bound on the age of cached "
1592 "DWARF compilation units is %s.\n"),
1596 /* local function prototypes */
1598 static const char *get_section_name (const struct dwarf2_section_info *);
1600 static const char *get_section_file_name (const struct dwarf2_section_info *);
1602 static void dwarf2_find_base_address (struct die_info *die,
1603 struct dwarf2_cu *cu);
1605 static struct partial_symtab *create_partial_symtab
1606 (struct dwarf2_per_cu_data *per_cu, const char *name);
1608 static void build_type_psymtabs_reader (const struct die_reader_specs *reader,
1609 const gdb_byte *info_ptr,
1610 struct die_info *type_unit_die,
1611 int has_children, void *data);
1613 static void dwarf2_build_psymtabs_hard (struct objfile *);
1615 static void scan_partial_symbols (struct partial_die_info *,
1616 CORE_ADDR *, CORE_ADDR *,
1617 int, struct dwarf2_cu *);
1619 static void add_partial_symbol (struct partial_die_info *,
1620 struct dwarf2_cu *);
1622 static void add_partial_namespace (struct partial_die_info *pdi,
1623 CORE_ADDR *lowpc, CORE_ADDR *highpc,
1624 int set_addrmap, struct dwarf2_cu *cu);
1626 static void add_partial_module (struct partial_die_info *pdi, CORE_ADDR *lowpc,
1627 CORE_ADDR *highpc, int set_addrmap,
1628 struct dwarf2_cu *cu);
1630 static void add_partial_enumeration (struct partial_die_info *enum_pdi,
1631 struct dwarf2_cu *cu);
1633 static void add_partial_subprogram (struct partial_die_info *pdi,
1634 CORE_ADDR *lowpc, CORE_ADDR *highpc,
1635 int need_pc, struct dwarf2_cu *cu);
1637 static void dwarf2_read_symtab (struct partial_symtab *,
1640 static void psymtab_to_symtab_1 (struct partial_symtab *);
1642 static struct abbrev_info *abbrev_table_lookup_abbrev
1643 (const struct abbrev_table *, unsigned int);
1645 static struct abbrev_table *abbrev_table_read_table
1646 (struct dwarf2_section_info *, sect_offset);
1648 static void abbrev_table_free (struct abbrev_table *);
1650 static void abbrev_table_free_cleanup (void *);
1652 static void dwarf2_read_abbrevs (struct dwarf2_cu *,
1653 struct dwarf2_section_info *);
1655 static void dwarf2_free_abbrev_table (void *);
1657 static unsigned int peek_abbrev_code (bfd *, const gdb_byte *);
1659 static struct partial_die_info *load_partial_dies
1660 (const struct die_reader_specs *, const gdb_byte *, int);
1662 static const gdb_byte *read_partial_die (const struct die_reader_specs *,
1663 struct partial_die_info *,
1664 struct abbrev_info *,
1668 static struct partial_die_info *find_partial_die (sect_offset, int,
1669 struct dwarf2_cu *);
1671 static void fixup_partial_die (struct partial_die_info *,
1672 struct dwarf2_cu *);
1674 static const gdb_byte *read_attribute (const struct die_reader_specs *,
1675 struct attribute *, struct attr_abbrev *,
1678 static unsigned int read_1_byte (bfd *, const gdb_byte *);
1680 static int read_1_signed_byte (bfd *, const gdb_byte *);
1682 static unsigned int read_2_bytes (bfd *, const gdb_byte *);
1684 static unsigned int read_4_bytes (bfd *, const gdb_byte *);
1686 static ULONGEST read_8_bytes (bfd *, const gdb_byte *);
1688 static CORE_ADDR read_address (bfd *, const gdb_byte *ptr, struct dwarf2_cu *,
1691 static LONGEST read_initial_length (bfd *, const gdb_byte *, unsigned int *);
1693 static LONGEST read_checked_initial_length_and_offset
1694 (bfd *, const gdb_byte *, const struct comp_unit_head *,
1695 unsigned int *, unsigned int *);
1697 static LONGEST read_offset (bfd *, const gdb_byte *,
1698 const struct comp_unit_head *,
1701 static LONGEST read_offset_1 (bfd *, const gdb_byte *, unsigned int);
1703 static sect_offset read_abbrev_offset (struct dwarf2_section_info *,
1706 static const gdb_byte *read_n_bytes (bfd *, const gdb_byte *, unsigned int);
1708 static const char *read_direct_string (bfd *, const gdb_byte *, unsigned int *);
1710 static const char *read_indirect_string (bfd *, const gdb_byte *,
1711 const struct comp_unit_head *,
1714 static const char *read_indirect_line_string (bfd *, const gdb_byte *,
1715 const struct comp_unit_head *,
1718 static const char *read_indirect_string_from_dwz (struct dwz_file *, LONGEST);
1720 static LONGEST read_signed_leb128 (bfd *, const gdb_byte *, unsigned int *);
1722 static CORE_ADDR read_addr_index_from_leb128 (struct dwarf2_cu *,
1726 static const char *read_str_index (const struct die_reader_specs *reader,
1727 ULONGEST str_index);
1729 static void set_cu_language (unsigned int, struct dwarf2_cu *);
1731 static struct attribute *dwarf2_attr (struct die_info *, unsigned int,
1732 struct dwarf2_cu *);
1734 static struct attribute *dwarf2_attr_no_follow (struct die_info *,
1737 static const char *dwarf2_string_attr (struct die_info *die, unsigned int name,
1738 struct dwarf2_cu *cu);
1740 static int dwarf2_flag_true_p (struct die_info *die, unsigned name,
1741 struct dwarf2_cu *cu);
1743 static int die_is_declaration (struct die_info *, struct dwarf2_cu *cu);
1745 static struct die_info *die_specification (struct die_info *die,
1746 struct dwarf2_cu **);
1748 static line_header_up dwarf_decode_line_header (sect_offset sect_off,
1749 struct dwarf2_cu *cu);
1751 static void dwarf_decode_lines (struct line_header *, const char *,
1752 struct dwarf2_cu *, struct partial_symtab *,
1753 CORE_ADDR, int decode_mapping);
1755 static void dwarf2_start_subfile (const char *, const char *);
1757 static struct compunit_symtab *dwarf2_start_symtab (struct dwarf2_cu *,
1758 const char *, const char *,
1761 static struct symbol *new_symbol (struct die_info *, struct type *,
1762 struct dwarf2_cu *);
1764 static struct symbol *new_symbol_full (struct die_info *, struct type *,
1765 struct dwarf2_cu *, struct symbol *);
1767 static void dwarf2_const_value (const struct attribute *, struct symbol *,
1768 struct dwarf2_cu *);
1770 static void dwarf2_const_value_attr (const struct attribute *attr,
1773 struct obstack *obstack,
1774 struct dwarf2_cu *cu, LONGEST *value,
1775 const gdb_byte **bytes,
1776 struct dwarf2_locexpr_baton **baton);
1778 static struct type *die_type (struct die_info *, struct dwarf2_cu *);
1780 static int need_gnat_info (struct dwarf2_cu *);
1782 static struct type *die_descriptive_type (struct die_info *,
1783 struct dwarf2_cu *);
1785 static void set_descriptive_type (struct type *, struct die_info *,
1786 struct dwarf2_cu *);
1788 static struct type *die_containing_type (struct die_info *,
1789 struct dwarf2_cu *);
1791 static struct type *lookup_die_type (struct die_info *, const struct attribute *,
1792 struct dwarf2_cu *);
1794 static struct type *read_type_die (struct die_info *, struct dwarf2_cu *);
1796 static struct type *read_type_die_1 (struct die_info *, struct dwarf2_cu *);
1798 static const char *determine_prefix (struct die_info *die, struct dwarf2_cu *);
1800 static char *typename_concat (struct obstack *obs, const char *prefix,
1801 const char *suffix, int physname,
1802 struct dwarf2_cu *cu);
1804 static void read_file_scope (struct die_info *, struct dwarf2_cu *);
1806 static void read_type_unit_scope (struct die_info *, struct dwarf2_cu *);
1808 static void read_func_scope (struct die_info *, struct dwarf2_cu *);
1810 static void read_lexical_block_scope (struct die_info *, struct dwarf2_cu *);
1812 static void read_call_site_scope (struct die_info *die, struct dwarf2_cu *cu);
1814 static void read_variable (struct die_info *die, struct dwarf2_cu *cu);
1816 static int dwarf2_ranges_read (unsigned, CORE_ADDR *, CORE_ADDR *,
1817 struct dwarf2_cu *, struct partial_symtab *);
1819 /* How dwarf2_get_pc_bounds constructed its *LOWPC and *HIGHPC return
1820 values. Keep the items ordered with increasing constraints compliance. */
1823 /* No attribute DW_AT_low_pc, DW_AT_high_pc or DW_AT_ranges was found. */
1824 PC_BOUNDS_NOT_PRESENT,
1826 /* Some of the attributes DW_AT_low_pc, DW_AT_high_pc or DW_AT_ranges
1827 were present but they do not form a valid range of PC addresses. */
1830 /* Discontiguous range was found - that is DW_AT_ranges was found. */
1833 /* Contiguous range was found - DW_AT_low_pc and DW_AT_high_pc were found. */
1837 static enum pc_bounds_kind dwarf2_get_pc_bounds (struct die_info *,
1838 CORE_ADDR *, CORE_ADDR *,
1840 struct partial_symtab *);
1842 static void get_scope_pc_bounds (struct die_info *,
1843 CORE_ADDR *, CORE_ADDR *,
1844 struct dwarf2_cu *);
1846 static void dwarf2_record_block_ranges (struct die_info *, struct block *,
1847 CORE_ADDR, struct dwarf2_cu *);
1849 static void dwarf2_add_field (struct field_info *, struct die_info *,
1850 struct dwarf2_cu *);
1852 static void dwarf2_attach_fields_to_type (struct field_info *,
1853 struct type *, struct dwarf2_cu *);
1855 static void dwarf2_add_member_fn (struct field_info *,
1856 struct die_info *, struct type *,
1857 struct dwarf2_cu *);
1859 static void dwarf2_attach_fn_fields_to_type (struct field_info *,
1861 struct dwarf2_cu *);
1863 static void process_structure_scope (struct die_info *, struct dwarf2_cu *);
1865 static void read_common_block (struct die_info *, struct dwarf2_cu *);
1867 static void read_namespace (struct die_info *die, struct dwarf2_cu *);
1869 static void read_module (struct die_info *die, struct dwarf2_cu *cu);
1871 static struct using_direct **using_directives (enum language);
1873 static void read_import_statement (struct die_info *die, struct dwarf2_cu *);
1875 static int read_namespace_alias (struct die_info *die, struct dwarf2_cu *cu);
1877 static struct type *read_module_type (struct die_info *die,
1878 struct dwarf2_cu *cu);
1880 static const char *namespace_name (struct die_info *die,
1881 int *is_anonymous, struct dwarf2_cu *);
1883 static void process_enumeration_scope (struct die_info *, struct dwarf2_cu *);
1885 static CORE_ADDR decode_locdesc (struct dwarf_block *, struct dwarf2_cu *);
1887 static enum dwarf_array_dim_ordering read_array_order (struct die_info *,
1888 struct dwarf2_cu *);
1890 static struct die_info *read_die_and_siblings_1
1891 (const struct die_reader_specs *, const gdb_byte *, const gdb_byte **,
1894 static struct die_info *read_die_and_siblings (const struct die_reader_specs *,
1895 const gdb_byte *info_ptr,
1896 const gdb_byte **new_info_ptr,
1897 struct die_info *parent);
1899 static const gdb_byte *read_full_die_1 (const struct die_reader_specs *,
1900 struct die_info **, const gdb_byte *,
1903 static const gdb_byte *read_full_die (const struct die_reader_specs *,
1904 struct die_info **, const gdb_byte *,
1907 static void process_die (struct die_info *, struct dwarf2_cu *);
1909 static const char *dwarf2_canonicalize_name (const char *, struct dwarf2_cu *,
1912 static const char *dwarf2_name (struct die_info *die, struct dwarf2_cu *);
1914 static const char *dwarf2_full_name (const char *name,
1915 struct die_info *die,
1916 struct dwarf2_cu *cu);
1918 static const char *dwarf2_physname (const char *name, struct die_info *die,
1919 struct dwarf2_cu *cu);
1921 static struct die_info *dwarf2_extension (struct die_info *die,
1922 struct dwarf2_cu **);
1924 static const char *dwarf_tag_name (unsigned int);
1926 static const char *dwarf_attr_name (unsigned int);
1928 static const char *dwarf_form_name (unsigned int);
1930 static const char *dwarf_bool_name (unsigned int);
1932 static const char *dwarf_type_encoding_name (unsigned int);
1934 static struct die_info *sibling_die (struct die_info *);
1936 static void dump_die_shallow (struct ui_file *, int indent, struct die_info *);
1938 static void dump_die_for_error (struct die_info *);
1940 static void dump_die_1 (struct ui_file *, int level, int max_level,
1943 /*static*/ void dump_die (struct die_info *, int max_level);
1945 static void store_in_ref_table (struct die_info *,
1946 struct dwarf2_cu *);
1948 static sect_offset dwarf2_get_ref_die_offset (const struct attribute *);
1950 static LONGEST dwarf2_get_attr_constant_value (const struct attribute *, int);
1952 static struct die_info *follow_die_ref_or_sig (struct die_info *,
1953 const struct attribute *,
1954 struct dwarf2_cu **);
1956 static struct die_info *follow_die_ref (struct die_info *,
1957 const struct attribute *,
1958 struct dwarf2_cu **);
1960 static struct die_info *follow_die_sig (struct die_info *,
1961 const struct attribute *,
1962 struct dwarf2_cu **);
1964 static struct type *get_signatured_type (struct die_info *, ULONGEST,
1965 struct dwarf2_cu *);
1967 static struct type *get_DW_AT_signature_type (struct die_info *,
1968 const struct attribute *,
1969 struct dwarf2_cu *);
1971 static void load_full_type_unit (struct dwarf2_per_cu_data *per_cu);
1973 static void read_signatured_type (struct signatured_type *);
1975 static int attr_to_dynamic_prop (const struct attribute *attr,
1976 struct die_info *die, struct dwarf2_cu *cu,
1977 struct dynamic_prop *prop);
1979 /* memory allocation interface */
1981 static struct dwarf_block *dwarf_alloc_block (struct dwarf2_cu *);
1983 static struct die_info *dwarf_alloc_die (struct dwarf2_cu *, int);
1985 static void dwarf_decode_macros (struct dwarf2_cu *, unsigned int, int);
1987 static int attr_form_is_block (const struct attribute *);
1989 static int attr_form_is_section_offset (const struct attribute *);
1991 static int attr_form_is_constant (const struct attribute *);
1993 static int attr_form_is_ref (const struct attribute *);
1995 static void fill_in_loclist_baton (struct dwarf2_cu *cu,
1996 struct dwarf2_loclist_baton *baton,
1997 const struct attribute *attr);
1999 static void dwarf2_symbol_mark_computed (const struct attribute *attr,
2001 struct dwarf2_cu *cu,
2004 static const gdb_byte *skip_one_die (const struct die_reader_specs *reader,
2005 const gdb_byte *info_ptr,
2006 struct abbrev_info *abbrev);
2008 static void free_stack_comp_unit (void *);
2010 static hashval_t partial_die_hash (const void *item);
2012 static int partial_die_eq (const void *item_lhs, const void *item_rhs);
2014 static struct dwarf2_per_cu_data *dwarf2_find_containing_comp_unit
2015 (sect_offset sect_off, unsigned int offset_in_dwz, struct objfile *objfile);
2017 static void init_one_comp_unit (struct dwarf2_cu *cu,
2018 struct dwarf2_per_cu_data *per_cu);
2020 static void prepare_one_comp_unit (struct dwarf2_cu *cu,
2021 struct die_info *comp_unit_die,
2022 enum language pretend_language);
2024 static void free_heap_comp_unit (void *);
2026 static void free_cached_comp_units (void *);
2028 static void age_cached_comp_units (void);
2030 static void free_one_cached_comp_unit (struct dwarf2_per_cu_data *);
2032 static struct type *set_die_type (struct die_info *, struct type *,
2033 struct dwarf2_cu *);
2035 static void create_all_comp_units (struct objfile *);
2037 static int create_all_type_units (struct objfile *);
2039 static void load_full_comp_unit (struct dwarf2_per_cu_data *,
2042 static void process_full_comp_unit (struct dwarf2_per_cu_data *,
2045 static void process_full_type_unit (struct dwarf2_per_cu_data *,
2048 static void dwarf2_add_dependence (struct dwarf2_cu *,
2049 struct dwarf2_per_cu_data *);
2051 static void dwarf2_mark (struct dwarf2_cu *);
2053 static void dwarf2_clear_marks (struct dwarf2_per_cu_data *);
2055 static struct type *get_die_type_at_offset (sect_offset,
2056 struct dwarf2_per_cu_data *);
2058 static struct type *get_die_type (struct die_info *die, struct dwarf2_cu *cu);
2060 static void dwarf2_release_queue (void *dummy);
2062 static void queue_comp_unit (struct dwarf2_per_cu_data *per_cu,
2063 enum language pretend_language);
2065 static void process_queue (void);
2067 /* The return type of find_file_and_directory. Note, the enclosed
2068 string pointers are only valid while this object is valid. */
2070 struct file_and_directory
2072 /* The filename. This is never NULL. */
2075 /* The compilation directory. NULL if not known. If we needed to
2076 compute a new string, this points to COMP_DIR_STORAGE, otherwise,
2077 points directly to the DW_AT_comp_dir string attribute owned by
2078 the obstack that owns the DIE. */
2079 const char *comp_dir;
2081 /* If we needed to build a new string for comp_dir, this is what
2082 owns the storage. */
2083 std::string comp_dir_storage;
2086 static file_and_directory find_file_and_directory (struct die_info *die,
2087 struct dwarf2_cu *cu);
2089 static char *file_full_name (int file, struct line_header *lh,
2090 const char *comp_dir);
2092 /* Expected enum dwarf_unit_type for read_comp_unit_head. */
2093 enum class rcuh_kind { COMPILE, TYPE };
2095 static const gdb_byte *read_and_check_comp_unit_head
2096 (struct comp_unit_head *header,
2097 struct dwarf2_section_info *section,
2098 struct dwarf2_section_info *abbrev_section, const gdb_byte *info_ptr,
2099 rcuh_kind section_kind);
2101 static void init_cutu_and_read_dies
2102 (struct dwarf2_per_cu_data *this_cu, struct abbrev_table *abbrev_table,
2103 int use_existing_cu, int keep,
2104 die_reader_func_ftype *die_reader_func, void *data);
2106 static void init_cutu_and_read_dies_simple
2107 (struct dwarf2_per_cu_data *this_cu,
2108 die_reader_func_ftype *die_reader_func, void *data);
2110 static htab_t allocate_signatured_type_table (struct objfile *objfile);
2112 static htab_t allocate_dwo_unit_table (struct objfile *objfile);
2114 static struct dwo_unit *lookup_dwo_unit_in_dwp
2115 (struct dwp_file *dwp_file, const char *comp_dir,
2116 ULONGEST signature, int is_debug_types);
2118 static struct dwp_file *get_dwp_file (void);
2120 static struct dwo_unit *lookup_dwo_comp_unit
2121 (struct dwarf2_per_cu_data *, const char *, const char *, ULONGEST);
2123 static struct dwo_unit *lookup_dwo_type_unit
2124 (struct signatured_type *, const char *, const char *);
2126 static void queue_and_load_all_dwo_tus (struct dwarf2_per_cu_data *);
2128 static void free_dwo_file_cleanup (void *);
2130 static void process_cu_includes (void);
2132 static void check_producer (struct dwarf2_cu *cu);
2134 static void free_line_header_voidp (void *arg);
2136 /* Various complaints about symbol reading that don't abort the process. */
2139 dwarf2_statement_list_fits_in_line_number_section_complaint (void)
2141 complaint (&symfile_complaints,
2142 _("statement list doesn't fit in .debug_line section"));
2146 dwarf2_debug_line_missing_file_complaint (void)
2148 complaint (&symfile_complaints,
2149 _(".debug_line section has line data without a file"));
2153 dwarf2_debug_line_missing_end_sequence_complaint (void)
2155 complaint (&symfile_complaints,
2156 _(".debug_line section has line "
2157 "program sequence without an end"));
2161 dwarf2_complex_location_expr_complaint (void)
2163 complaint (&symfile_complaints, _("location expression too complex"));
2167 dwarf2_const_value_length_mismatch_complaint (const char *arg1, int arg2,
2170 complaint (&symfile_complaints,
2171 _("const value length mismatch for '%s', got %d, expected %d"),
2176 dwarf2_section_buffer_overflow_complaint (struct dwarf2_section_info *section)
2178 complaint (&symfile_complaints,
2179 _("debug info runs off end of %s section"
2181 get_section_name (section),
2182 get_section_file_name (section));
2186 dwarf2_macro_malformed_definition_complaint (const char *arg1)
2188 complaint (&symfile_complaints,
2189 _("macro debug info contains a "
2190 "malformed macro definition:\n`%s'"),
2195 dwarf2_invalid_attrib_class_complaint (const char *arg1, const char *arg2)
2197 complaint (&symfile_complaints,
2198 _("invalid attribute class or form for '%s' in '%s'"),
2202 /* Hash function for line_header_hash. */
2205 line_header_hash (const struct line_header *ofs)
2207 return to_underlying (ofs->sect_off) ^ ofs->offset_in_dwz;
2210 /* Hash function for htab_create_alloc_ex for line_header_hash. */
2213 line_header_hash_voidp (const void *item)
2215 const struct line_header *ofs = (const struct line_header *) item;
2217 return line_header_hash (ofs);
2220 /* Equality function for line_header_hash. */
2223 line_header_eq_voidp (const void *item_lhs, const void *item_rhs)
2225 const struct line_header *ofs_lhs = (const struct line_header *) item_lhs;
2226 const struct line_header *ofs_rhs = (const struct line_header *) item_rhs;
2228 return (ofs_lhs->sect_off == ofs_rhs->sect_off
2229 && ofs_lhs->offset_in_dwz == ofs_rhs->offset_in_dwz);
2234 /* Read the given attribute value as an address, taking the attribute's
2235 form into account. */
2238 attr_value_as_address (struct attribute *attr)
2242 if (attr->form != DW_FORM_addr && attr->form != DW_FORM_GNU_addr_index)
2244 /* Aside from a few clearly defined exceptions, attributes that
2245 contain an address must always be in DW_FORM_addr form.
2246 Unfortunately, some compilers happen to be violating this
2247 requirement by encoding addresses using other forms, such
2248 as DW_FORM_data4 for example. For those broken compilers,
2249 we try to do our best, without any guarantee of success,
2250 to interpret the address correctly. It would also be nice
2251 to generate a complaint, but that would require us to maintain
2252 a list of legitimate cases where a non-address form is allowed,
2253 as well as update callers to pass in at least the CU's DWARF
2254 version. This is more overhead than what we're willing to
2255 expand for a pretty rare case. */
2256 addr = DW_UNSND (attr);
2259 addr = DW_ADDR (attr);
2264 /* The suffix for an index file. */
2265 #define INDEX_SUFFIX ".gdb-index"
2267 /* See declaration. */
2269 dwarf2_per_objfile::dwarf2_per_objfile (struct objfile *objfile_,
2270 const dwarf2_debug_sections *names)
2271 : objfile (objfile_)
2274 names = &dwarf2_elf_names;
2276 bfd *obfd = objfile->obfd;
2278 for (asection *sec = obfd->sections; sec != NULL; sec = sec->next)
2279 locate_sections (obfd, sec, *names);
2282 dwarf2_per_objfile::~dwarf2_per_objfile ()
2284 /* Cached DIE trees use xmalloc and the comp_unit_obstack. */
2285 free_cached_comp_units ();
2287 if (quick_file_names_table)
2288 htab_delete (quick_file_names_table);
2290 if (line_header_hash)
2291 htab_delete (line_header_hash);
2293 /* Everything else should be on the objfile obstack. */
2296 /* See declaration. */
2299 dwarf2_per_objfile::free_cached_comp_units ()
2301 dwarf2_per_cu_data *per_cu = read_in_chain;
2302 dwarf2_per_cu_data **last_chain = &read_in_chain;
2303 while (per_cu != NULL)
2305 dwarf2_per_cu_data *next_cu = per_cu->cu->read_in_chain;
2307 free_heap_comp_unit (per_cu->cu);
2308 *last_chain = next_cu;
2313 /* Try to locate the sections we need for DWARF 2 debugging
2314 information and return true if we have enough to do something.
2315 NAMES points to the dwarf2 section names, or is NULL if the standard
2316 ELF names are used. */
2319 dwarf2_has_info (struct objfile *objfile,
2320 const struct dwarf2_debug_sections *names)
2322 dwarf2_per_objfile = ((struct dwarf2_per_objfile *)
2323 objfile_data (objfile, dwarf2_objfile_data_key));
2324 if (!dwarf2_per_objfile)
2326 /* Initialize per-objfile state. */
2327 struct dwarf2_per_objfile *data
2328 = XOBNEW (&objfile->objfile_obstack, struct dwarf2_per_objfile);
2330 dwarf2_per_objfile = new (data) struct dwarf2_per_objfile (objfile, names);
2331 set_objfile_data (objfile, dwarf2_objfile_data_key, dwarf2_per_objfile);
2333 return (!dwarf2_per_objfile->info.is_virtual
2334 && dwarf2_per_objfile->info.s.section != NULL
2335 && !dwarf2_per_objfile->abbrev.is_virtual
2336 && dwarf2_per_objfile->abbrev.s.section != NULL);
2339 /* Return the containing section of virtual section SECTION. */
2341 static struct dwarf2_section_info *
2342 get_containing_section (const struct dwarf2_section_info *section)
2344 gdb_assert (section->is_virtual);
2345 return section->s.containing_section;
2348 /* Return the bfd owner of SECTION. */
2351 get_section_bfd_owner (const struct dwarf2_section_info *section)
2353 if (section->is_virtual)
2355 section = get_containing_section (section);
2356 gdb_assert (!section->is_virtual);
2358 return section->s.section->owner;
2361 /* Return the bfd section of SECTION.
2362 Returns NULL if the section is not present. */
2365 get_section_bfd_section (const struct dwarf2_section_info *section)
2367 if (section->is_virtual)
2369 section = get_containing_section (section);
2370 gdb_assert (!section->is_virtual);
2372 return section->s.section;
2375 /* Return the name of SECTION. */
2378 get_section_name (const struct dwarf2_section_info *section)
2380 asection *sectp = get_section_bfd_section (section);
2382 gdb_assert (sectp != NULL);
2383 return bfd_section_name (get_section_bfd_owner (section), sectp);
2386 /* Return the name of the file SECTION is in. */
2389 get_section_file_name (const struct dwarf2_section_info *section)
2391 bfd *abfd = get_section_bfd_owner (section);
2393 return bfd_get_filename (abfd);
2396 /* Return the id of SECTION.
2397 Returns 0 if SECTION doesn't exist. */
2400 get_section_id (const struct dwarf2_section_info *section)
2402 asection *sectp = get_section_bfd_section (section);
2409 /* Return the flags of SECTION.
2410 SECTION (or containing section if this is a virtual section) must exist. */
2413 get_section_flags (const struct dwarf2_section_info *section)
2415 asection *sectp = get_section_bfd_section (section);
2417 gdb_assert (sectp != NULL);
2418 return bfd_get_section_flags (sectp->owner, sectp);
2421 /* When loading sections, we look either for uncompressed section or for
2422 compressed section names. */
2425 section_is_p (const char *section_name,
2426 const struct dwarf2_section_names *names)
2428 if (names->normal != NULL
2429 && strcmp (section_name, names->normal) == 0)
2431 if (names->compressed != NULL
2432 && strcmp (section_name, names->compressed) == 0)
2437 /* See declaration. */
2440 dwarf2_per_objfile::locate_sections (bfd *abfd, asection *sectp,
2441 const dwarf2_debug_sections &names)
2443 flagword aflag = bfd_get_section_flags (abfd, sectp);
2445 if ((aflag & SEC_HAS_CONTENTS) == 0)
2448 else if (section_is_p (sectp->name, &names.info))
2450 this->info.s.section = sectp;
2451 this->info.size = bfd_get_section_size (sectp);
2453 else if (section_is_p (sectp->name, &names.abbrev))
2455 this->abbrev.s.section = sectp;
2456 this->abbrev.size = bfd_get_section_size (sectp);
2458 else if (section_is_p (sectp->name, &names.line))
2460 this->line.s.section = sectp;
2461 this->line.size = bfd_get_section_size (sectp);
2463 else if (section_is_p (sectp->name, &names.loc))
2465 this->loc.s.section = sectp;
2466 this->loc.size = bfd_get_section_size (sectp);
2468 else if (section_is_p (sectp->name, &names.loclists))
2470 this->loclists.s.section = sectp;
2471 this->loclists.size = bfd_get_section_size (sectp);
2473 else if (section_is_p (sectp->name, &names.macinfo))
2475 this->macinfo.s.section = sectp;
2476 this->macinfo.size = bfd_get_section_size (sectp);
2478 else if (section_is_p (sectp->name, &names.macro))
2480 this->macro.s.section = sectp;
2481 this->macro.size = bfd_get_section_size (sectp);
2483 else if (section_is_p (sectp->name, &names.str))
2485 this->str.s.section = sectp;
2486 this->str.size = bfd_get_section_size (sectp);
2488 else if (section_is_p (sectp->name, &names.line_str))
2490 this->line_str.s.section = sectp;
2491 this->line_str.size = bfd_get_section_size (sectp);
2493 else if (section_is_p (sectp->name, &names.addr))
2495 this->addr.s.section = sectp;
2496 this->addr.size = bfd_get_section_size (sectp);
2498 else if (section_is_p (sectp->name, &names.frame))
2500 this->frame.s.section = sectp;
2501 this->frame.size = bfd_get_section_size (sectp);
2503 else if (section_is_p (sectp->name, &names.eh_frame))
2505 this->eh_frame.s.section = sectp;
2506 this->eh_frame.size = bfd_get_section_size (sectp);
2508 else if (section_is_p (sectp->name, &names.ranges))
2510 this->ranges.s.section = sectp;
2511 this->ranges.size = bfd_get_section_size (sectp);
2513 else if (section_is_p (sectp->name, &names.rnglists))
2515 this->rnglists.s.section = sectp;
2516 this->rnglists.size = bfd_get_section_size (sectp);
2518 else if (section_is_p (sectp->name, &names.types))
2520 struct dwarf2_section_info type_section;
2522 memset (&type_section, 0, sizeof (type_section));
2523 type_section.s.section = sectp;
2524 type_section.size = bfd_get_section_size (sectp);
2526 VEC_safe_push (dwarf2_section_info_def, this->types,
2529 else if (section_is_p (sectp->name, &names.gdb_index))
2531 this->gdb_index.s.section = sectp;
2532 this->gdb_index.size = bfd_get_section_size (sectp);
2535 if ((bfd_get_section_flags (abfd, sectp) & (SEC_LOAD | SEC_ALLOC))
2536 && bfd_section_vma (abfd, sectp) == 0)
2537 this->has_section_at_zero = true;
2540 /* A helper function that decides whether a section is empty,
2544 dwarf2_section_empty_p (const struct dwarf2_section_info *section)
2546 if (section->is_virtual)
2547 return section->size == 0;
2548 return section->s.section == NULL || section->size == 0;
2551 /* Read the contents of the section INFO.
2552 OBJFILE is the main object file, but not necessarily the file where
2553 the section comes from. E.g., for DWO files the bfd of INFO is the bfd
2555 If the section is compressed, uncompress it before returning. */
2558 dwarf2_read_section (struct objfile *objfile, struct dwarf2_section_info *info)
2562 gdb_byte *buf, *retbuf;
2566 info->buffer = NULL;
2569 if (dwarf2_section_empty_p (info))
2572 sectp = get_section_bfd_section (info);
2574 /* If this is a virtual section we need to read in the real one first. */
2575 if (info->is_virtual)
2577 struct dwarf2_section_info *containing_section =
2578 get_containing_section (info);
2580 gdb_assert (sectp != NULL);
2581 if ((sectp->flags & SEC_RELOC) != 0)
2583 error (_("Dwarf Error: DWP format V2 with relocations is not"
2584 " supported in section %s [in module %s]"),
2585 get_section_name (info), get_section_file_name (info));
2587 dwarf2_read_section (objfile, containing_section);
2588 /* Other code should have already caught virtual sections that don't
2590 gdb_assert (info->virtual_offset + info->size
2591 <= containing_section->size);
2592 /* If the real section is empty or there was a problem reading the
2593 section we shouldn't get here. */
2594 gdb_assert (containing_section->buffer != NULL);
2595 info->buffer = containing_section->buffer + info->virtual_offset;
2599 /* If the section has relocations, we must read it ourselves.
2600 Otherwise we attach it to the BFD. */
2601 if ((sectp->flags & SEC_RELOC) == 0)
2603 info->buffer = gdb_bfd_map_section (sectp, &info->size);
2607 buf = (gdb_byte *) obstack_alloc (&objfile->objfile_obstack, info->size);
2610 /* When debugging .o files, we may need to apply relocations; see
2611 http://sourceware.org/ml/gdb-patches/2002-04/msg00136.html .
2612 We never compress sections in .o files, so we only need to
2613 try this when the section is not compressed. */
2614 retbuf = symfile_relocate_debug_section (objfile, sectp, buf);
2617 info->buffer = retbuf;
2621 abfd = get_section_bfd_owner (info);
2622 gdb_assert (abfd != NULL);
2624 if (bfd_seek (abfd, sectp->filepos, SEEK_SET) != 0
2625 || bfd_bread (buf, info->size, abfd) != info->size)
2627 error (_("Dwarf Error: Can't read DWARF data"
2628 " in section %s [in module %s]"),
2629 bfd_section_name (abfd, sectp), bfd_get_filename (abfd));
2633 /* A helper function that returns the size of a section in a safe way.
2634 If you are positive that the section has been read before using the
2635 size, then it is safe to refer to the dwarf2_section_info object's
2636 "size" field directly. In other cases, you must call this
2637 function, because for compressed sections the size field is not set
2638 correctly until the section has been read. */
2640 static bfd_size_type
2641 dwarf2_section_size (struct objfile *objfile,
2642 struct dwarf2_section_info *info)
2645 dwarf2_read_section (objfile, info);
2649 /* Fill in SECTP, BUFP and SIZEP with section info, given OBJFILE and
2653 dwarf2_get_section_info (struct objfile *objfile,
2654 enum dwarf2_section_enum sect,
2655 asection **sectp, const gdb_byte **bufp,
2656 bfd_size_type *sizep)
2658 struct dwarf2_per_objfile *data
2659 = (struct dwarf2_per_objfile *) objfile_data (objfile,
2660 dwarf2_objfile_data_key);
2661 struct dwarf2_section_info *info;
2663 /* We may see an objfile without any DWARF, in which case we just
2674 case DWARF2_DEBUG_FRAME:
2675 info = &data->frame;
2677 case DWARF2_EH_FRAME:
2678 info = &data->eh_frame;
2681 gdb_assert_not_reached ("unexpected section");
2684 dwarf2_read_section (objfile, info);
2686 *sectp = get_section_bfd_section (info);
2687 *bufp = info->buffer;
2688 *sizep = info->size;
2691 /* A helper function to find the sections for a .dwz file. */
2694 locate_dwz_sections (bfd *abfd, asection *sectp, void *arg)
2696 struct dwz_file *dwz_file = (struct dwz_file *) arg;
2698 /* Note that we only support the standard ELF names, because .dwz
2699 is ELF-only (at the time of writing). */
2700 if (section_is_p (sectp->name, &dwarf2_elf_names.abbrev))
2702 dwz_file->abbrev.s.section = sectp;
2703 dwz_file->abbrev.size = bfd_get_section_size (sectp);
2705 else if (section_is_p (sectp->name, &dwarf2_elf_names.info))
2707 dwz_file->info.s.section = sectp;
2708 dwz_file->info.size = bfd_get_section_size (sectp);
2710 else if (section_is_p (sectp->name, &dwarf2_elf_names.str))
2712 dwz_file->str.s.section = sectp;
2713 dwz_file->str.size = bfd_get_section_size (sectp);
2715 else if (section_is_p (sectp->name, &dwarf2_elf_names.line))
2717 dwz_file->line.s.section = sectp;
2718 dwz_file->line.size = bfd_get_section_size (sectp);
2720 else if (section_is_p (sectp->name, &dwarf2_elf_names.macro))
2722 dwz_file->macro.s.section = sectp;
2723 dwz_file->macro.size = bfd_get_section_size (sectp);
2725 else if (section_is_p (sectp->name, &dwarf2_elf_names.gdb_index))
2727 dwz_file->gdb_index.s.section = sectp;
2728 dwz_file->gdb_index.size = bfd_get_section_size (sectp);
2732 /* Open the separate '.dwz' debug file, if needed. Return NULL if
2733 there is no .gnu_debugaltlink section in the file. Error if there
2734 is such a section but the file cannot be found. */
2736 static struct dwz_file *
2737 dwarf2_get_dwz_file (void)
2739 const char *filename;
2740 struct dwz_file *result;
2741 bfd_size_type buildid_len_arg;
2745 if (dwarf2_per_objfile->dwz_file != NULL)
2746 return dwarf2_per_objfile->dwz_file;
2748 bfd_set_error (bfd_error_no_error);
2749 gdb::unique_xmalloc_ptr<char> data
2750 (bfd_get_alt_debug_link_info (dwarf2_per_objfile->objfile->obfd,
2751 &buildid_len_arg, &buildid));
2754 if (bfd_get_error () == bfd_error_no_error)
2756 error (_("could not read '.gnu_debugaltlink' section: %s"),
2757 bfd_errmsg (bfd_get_error ()));
2760 gdb::unique_xmalloc_ptr<bfd_byte> buildid_holder (buildid);
2762 buildid_len = (size_t) buildid_len_arg;
2764 filename = data.get ();
2766 std::string abs_storage;
2767 if (!IS_ABSOLUTE_PATH (filename))
2769 gdb::unique_xmalloc_ptr<char> abs
2770 = gdb_realpath (objfile_name (dwarf2_per_objfile->objfile));
2772 abs_storage = ldirname (abs.get ()) + SLASH_STRING + filename;
2773 filename = abs_storage.c_str ();
2776 /* First try the file name given in the section. If that doesn't
2777 work, try to use the build-id instead. */
2778 gdb_bfd_ref_ptr dwz_bfd (gdb_bfd_open (filename, gnutarget, -1));
2779 if (dwz_bfd != NULL)
2781 if (!build_id_verify (dwz_bfd.get (), buildid_len, buildid))
2785 if (dwz_bfd == NULL)
2786 dwz_bfd = build_id_to_debug_bfd (buildid_len, buildid);
2788 if (dwz_bfd == NULL)
2789 error (_("could not find '.gnu_debugaltlink' file for %s"),
2790 objfile_name (dwarf2_per_objfile->objfile));
2792 result = OBSTACK_ZALLOC (&dwarf2_per_objfile->objfile->objfile_obstack,
2794 result->dwz_bfd = dwz_bfd.release ();
2796 bfd_map_over_sections (result->dwz_bfd, locate_dwz_sections, result);
2798 gdb_bfd_record_inclusion (dwarf2_per_objfile->objfile->obfd, result->dwz_bfd);
2799 dwarf2_per_objfile->dwz_file = result;
2803 /* DWARF quick_symbols_functions support. */
2805 /* TUs can share .debug_line entries, and there can be a lot more TUs than
2806 unique line tables, so we maintain a separate table of all .debug_line
2807 derived entries to support the sharing.
2808 All the quick functions need is the list of file names. We discard the
2809 line_header when we're done and don't need to record it here. */
2810 struct quick_file_names
2812 /* The data used to construct the hash key. */
2813 struct stmt_list_hash hash;
2815 /* The number of entries in file_names, real_names. */
2816 unsigned int num_file_names;
2818 /* The file names from the line table, after being run through
2820 const char **file_names;
2822 /* The file names from the line table after being run through
2823 gdb_realpath. These are computed lazily. */
2824 const char **real_names;
2827 /* When using the index (and thus not using psymtabs), each CU has an
2828 object of this type. This is used to hold information needed by
2829 the various "quick" methods. */
2830 struct dwarf2_per_cu_quick_data
2832 /* The file table. This can be NULL if there was no file table
2833 or it's currently not read in.
2834 NOTE: This points into dwarf2_per_objfile->quick_file_names_table. */
2835 struct quick_file_names *file_names;
2837 /* The corresponding symbol table. This is NULL if symbols for this
2838 CU have not yet been read. */
2839 struct compunit_symtab *compunit_symtab;
2841 /* A temporary mark bit used when iterating over all CUs in
2842 expand_symtabs_matching. */
2843 unsigned int mark : 1;
2845 /* True if we've tried to read the file table and found there isn't one.
2846 There will be no point in trying to read it again next time. */
2847 unsigned int no_file_data : 1;
2850 /* Utility hash function for a stmt_list_hash. */
2853 hash_stmt_list_entry (const struct stmt_list_hash *stmt_list_hash)
2857 if (stmt_list_hash->dwo_unit != NULL)
2858 v += (uintptr_t) stmt_list_hash->dwo_unit->dwo_file;
2859 v += to_underlying (stmt_list_hash->line_sect_off);
2863 /* Utility equality function for a stmt_list_hash. */
2866 eq_stmt_list_entry (const struct stmt_list_hash *lhs,
2867 const struct stmt_list_hash *rhs)
2869 if ((lhs->dwo_unit != NULL) != (rhs->dwo_unit != NULL))
2871 if (lhs->dwo_unit != NULL
2872 && lhs->dwo_unit->dwo_file != rhs->dwo_unit->dwo_file)
2875 return lhs->line_sect_off == rhs->line_sect_off;
2878 /* Hash function for a quick_file_names. */
2881 hash_file_name_entry (const void *e)
2883 const struct quick_file_names *file_data
2884 = (const struct quick_file_names *) e;
2886 return hash_stmt_list_entry (&file_data->hash);
2889 /* Equality function for a quick_file_names. */
2892 eq_file_name_entry (const void *a, const void *b)
2894 const struct quick_file_names *ea = (const struct quick_file_names *) a;
2895 const struct quick_file_names *eb = (const struct quick_file_names *) b;
2897 return eq_stmt_list_entry (&ea->hash, &eb->hash);
2900 /* Delete function for a quick_file_names. */
2903 delete_file_name_entry (void *e)
2905 struct quick_file_names *file_data = (struct quick_file_names *) e;
2908 for (i = 0; i < file_data->num_file_names; ++i)
2910 xfree ((void*) file_data->file_names[i]);
2911 if (file_data->real_names)
2912 xfree ((void*) file_data->real_names[i]);
2915 /* The space for the struct itself lives on objfile_obstack,
2916 so we don't free it here. */
2919 /* Create a quick_file_names hash table. */
2922 create_quick_file_names_table (unsigned int nr_initial_entries)
2924 return htab_create_alloc (nr_initial_entries,
2925 hash_file_name_entry, eq_file_name_entry,
2926 delete_file_name_entry, xcalloc, xfree);
2929 /* Read in PER_CU->CU. This function is unrelated to symtabs, symtab would
2930 have to be created afterwards. You should call age_cached_comp_units after
2931 processing PER_CU->CU. dw2_setup must have been already called. */
2934 load_cu (struct dwarf2_per_cu_data *per_cu)
2936 if (per_cu->is_debug_types)
2937 load_full_type_unit (per_cu);
2939 load_full_comp_unit (per_cu, language_minimal);
2941 if (per_cu->cu == NULL)
2942 return; /* Dummy CU. */
2944 dwarf2_find_base_address (per_cu->cu->dies, per_cu->cu);
2947 /* Read in the symbols for PER_CU. */
2950 dw2_do_instantiate_symtab (struct dwarf2_per_cu_data *per_cu)
2952 struct cleanup *back_to;
2954 /* Skip type_unit_groups, reading the type units they contain
2955 is handled elsewhere. */
2956 if (IS_TYPE_UNIT_GROUP (per_cu))
2959 back_to = make_cleanup (dwarf2_release_queue, NULL);
2961 if (dwarf2_per_objfile->using_index
2962 ? per_cu->v.quick->compunit_symtab == NULL
2963 : (per_cu->v.psymtab == NULL || !per_cu->v.psymtab->readin))
2965 queue_comp_unit (per_cu, language_minimal);
2968 /* If we just loaded a CU from a DWO, and we're working with an index
2969 that may badly handle TUs, load all the TUs in that DWO as well.
2970 http://sourceware.org/bugzilla/show_bug.cgi?id=15021 */
2971 if (!per_cu->is_debug_types
2972 && per_cu->cu != NULL
2973 && per_cu->cu->dwo_unit != NULL
2974 && dwarf2_per_objfile->index_table != NULL
2975 && dwarf2_per_objfile->index_table->version <= 7
2976 /* DWP files aren't supported yet. */
2977 && get_dwp_file () == NULL)
2978 queue_and_load_all_dwo_tus (per_cu);
2983 /* Age the cache, releasing compilation units that have not
2984 been used recently. */
2985 age_cached_comp_units ();
2987 do_cleanups (back_to);
2990 /* Ensure that the symbols for PER_CU have been read in. OBJFILE is
2991 the objfile from which this CU came. Returns the resulting symbol
2994 static struct compunit_symtab *
2995 dw2_instantiate_symtab (struct dwarf2_per_cu_data *per_cu)
2997 gdb_assert (dwarf2_per_objfile->using_index);
2998 if (!per_cu->v.quick->compunit_symtab)
3000 struct cleanup *back_to = make_cleanup (free_cached_comp_units, NULL);
3001 scoped_restore decrementer = increment_reading_symtab ();
3002 dw2_do_instantiate_symtab (per_cu);
3003 process_cu_includes ();
3004 do_cleanups (back_to);
3007 return per_cu->v.quick->compunit_symtab;
3010 /* Return the CU/TU given its index.
3012 This is intended for loops like:
3014 for (i = 0; i < (dwarf2_per_objfile->n_comp_units
3015 + dwarf2_per_objfile->n_type_units); ++i)
3017 struct dwarf2_per_cu_data *per_cu = dw2_get_cutu (i);
3023 static struct dwarf2_per_cu_data *
3024 dw2_get_cutu (int index)
3026 if (index >= dwarf2_per_objfile->n_comp_units)
3028 index -= dwarf2_per_objfile->n_comp_units;
3029 gdb_assert (index < dwarf2_per_objfile->n_type_units);
3030 return &dwarf2_per_objfile->all_type_units[index]->per_cu;
3033 return dwarf2_per_objfile->all_comp_units[index];
3036 /* Return the CU given its index.
3037 This differs from dw2_get_cutu in that it's for when you know INDEX
3040 static struct dwarf2_per_cu_data *
3041 dw2_get_cu (int index)
3043 gdb_assert (index >= 0 && index < dwarf2_per_objfile->n_comp_units);
3045 return dwarf2_per_objfile->all_comp_units[index];
3048 /* A helper for create_cus_from_index that handles a given list of
3052 create_cus_from_index_list (struct objfile *objfile,
3053 const gdb_byte *cu_list, offset_type n_elements,
3054 struct dwarf2_section_info *section,
3060 for (i = 0; i < n_elements; i += 2)
3062 gdb_static_assert (sizeof (ULONGEST) >= 8);
3064 sect_offset sect_off
3065 = (sect_offset) extract_unsigned_integer (cu_list, 8, BFD_ENDIAN_LITTLE);
3066 ULONGEST length = extract_unsigned_integer (cu_list + 8, 8, BFD_ENDIAN_LITTLE);
3069 dwarf2_per_cu_data *the_cu
3070 = OBSTACK_ZALLOC (&objfile->objfile_obstack,
3071 struct dwarf2_per_cu_data);
3072 the_cu->sect_off = sect_off;
3073 the_cu->length = length;
3074 the_cu->objfile = objfile;
3075 the_cu->section = section;
3076 the_cu->v.quick = OBSTACK_ZALLOC (&objfile->objfile_obstack,
3077 struct dwarf2_per_cu_quick_data);
3078 the_cu->is_dwz = is_dwz;
3079 dwarf2_per_objfile->all_comp_units[base_offset + i / 2] = the_cu;
3083 /* Read the CU list from the mapped index, and use it to create all
3084 the CU objects for this objfile. */
3087 create_cus_from_index (struct objfile *objfile,
3088 const gdb_byte *cu_list, offset_type cu_list_elements,
3089 const gdb_byte *dwz_list, offset_type dwz_elements)
3091 struct dwz_file *dwz;
3093 dwarf2_per_objfile->n_comp_units = (cu_list_elements + dwz_elements) / 2;
3094 dwarf2_per_objfile->all_comp_units =
3095 XOBNEWVEC (&objfile->objfile_obstack, struct dwarf2_per_cu_data *,
3096 dwarf2_per_objfile->n_comp_units);
3098 create_cus_from_index_list (objfile, cu_list, cu_list_elements,
3099 &dwarf2_per_objfile->info, 0, 0);
3101 if (dwz_elements == 0)
3104 dwz = dwarf2_get_dwz_file ();
3105 create_cus_from_index_list (objfile, dwz_list, dwz_elements, &dwz->info, 1,
3106 cu_list_elements / 2);
3109 /* Create the signatured type hash table from the index. */
3112 create_signatured_type_table_from_index (struct objfile *objfile,
3113 struct dwarf2_section_info *section,
3114 const gdb_byte *bytes,
3115 offset_type elements)
3118 htab_t sig_types_hash;
3120 dwarf2_per_objfile->n_type_units
3121 = dwarf2_per_objfile->n_allocated_type_units
3123 dwarf2_per_objfile->all_type_units =
3124 XNEWVEC (struct signatured_type *, dwarf2_per_objfile->n_type_units);
3126 sig_types_hash = allocate_signatured_type_table (objfile);
3128 for (i = 0; i < elements; i += 3)
3130 struct signatured_type *sig_type;
3133 cu_offset type_offset_in_tu;
3135 gdb_static_assert (sizeof (ULONGEST) >= 8);
3136 sect_offset sect_off
3137 = (sect_offset) extract_unsigned_integer (bytes, 8, BFD_ENDIAN_LITTLE);
3139 = (cu_offset) extract_unsigned_integer (bytes + 8, 8,
3141 signature = extract_unsigned_integer (bytes + 16, 8, BFD_ENDIAN_LITTLE);
3144 sig_type = OBSTACK_ZALLOC (&objfile->objfile_obstack,
3145 struct signatured_type);
3146 sig_type->signature = signature;
3147 sig_type->type_offset_in_tu = type_offset_in_tu;
3148 sig_type->per_cu.is_debug_types = 1;
3149 sig_type->per_cu.section = section;
3150 sig_type->per_cu.sect_off = sect_off;
3151 sig_type->per_cu.objfile = objfile;
3152 sig_type->per_cu.v.quick
3153 = OBSTACK_ZALLOC (&objfile->objfile_obstack,
3154 struct dwarf2_per_cu_quick_data);
3156 slot = htab_find_slot (sig_types_hash, sig_type, INSERT);
3159 dwarf2_per_objfile->all_type_units[i / 3] = sig_type;
3162 dwarf2_per_objfile->signatured_types = sig_types_hash;
3165 /* Read the address map data from the mapped index, and use it to
3166 populate the objfile's psymtabs_addrmap. */
3169 create_addrmap_from_index (struct objfile *objfile, struct mapped_index *index)
3171 struct gdbarch *gdbarch = get_objfile_arch (objfile);
3172 const gdb_byte *iter, *end;
3173 struct addrmap *mutable_map;
3176 auto_obstack temp_obstack;
3178 mutable_map = addrmap_create_mutable (&temp_obstack);
3180 iter = index->address_table;
3181 end = iter + index->address_table_size;
3183 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
3187 ULONGEST hi, lo, cu_index;
3188 lo = extract_unsigned_integer (iter, 8, BFD_ENDIAN_LITTLE);
3190 hi = extract_unsigned_integer (iter, 8, BFD_ENDIAN_LITTLE);
3192 cu_index = extract_unsigned_integer (iter, 4, BFD_ENDIAN_LITTLE);
3197 complaint (&symfile_complaints,
3198 _(".gdb_index address table has invalid range (%s - %s)"),
3199 hex_string (lo), hex_string (hi));
3203 if (cu_index >= dwarf2_per_objfile->n_comp_units)
3205 complaint (&symfile_complaints,
3206 _(".gdb_index address table has invalid CU number %u"),
3207 (unsigned) cu_index);
3211 lo = gdbarch_adjust_dwarf2_addr (gdbarch, lo + baseaddr);
3212 hi = gdbarch_adjust_dwarf2_addr (gdbarch, hi + baseaddr);
3213 addrmap_set_empty (mutable_map, lo, hi - 1, dw2_get_cutu (cu_index));
3216 objfile->psymtabs_addrmap = addrmap_create_fixed (mutable_map,
3217 &objfile->objfile_obstack);
3220 /* The hash function for strings in the mapped index. This is the same as
3221 SYMBOL_HASH_NEXT, but we keep a separate copy to maintain control over the
3222 implementation. This is necessary because the hash function is tied to the
3223 format of the mapped index file. The hash values do not have to match with
3226 Use INT_MAX for INDEX_VERSION if you generate the current index format. */
3229 mapped_index_string_hash (int index_version, const void *p)
3231 const unsigned char *str = (const unsigned char *) p;
3235 while ((c = *str++) != 0)
3237 if (index_version >= 5)
3239 r = r * 67 + c - 113;
3245 /* Find a slot in the mapped index INDEX for the object named NAME.
3246 If NAME is found, set *VEC_OUT to point to the CU vector in the
3247 constant pool and return true. If NAME cannot be found, return
3251 find_slot_in_mapped_hash (struct mapped_index *index, const char *name,
3252 offset_type **vec_out)
3255 offset_type slot, step;
3256 int (*cmp) (const char *, const char *);
3258 gdb::unique_xmalloc_ptr<char> without_params;
3259 if (current_language->la_language == language_cplus
3260 || current_language->la_language == language_fortran
3261 || current_language->la_language == language_d)
3263 /* NAME is already canonical. Drop any qualifiers as .gdb_index does
3266 if (strchr (name, '(') != NULL)
3268 without_params = cp_remove_params (name);
3270 if (without_params != NULL)
3271 name = without_params.get ();
3275 /* Index version 4 did not support case insensitive searches. But the
3276 indices for case insensitive languages are built in lowercase, therefore
3277 simulate our NAME being searched is also lowercased. */
3278 hash = mapped_index_string_hash ((index->version == 4
3279 && case_sensitivity == case_sensitive_off
3280 ? 5 : index->version),
3283 slot = hash & (index->symbol_table_slots - 1);
3284 step = ((hash * 17) & (index->symbol_table_slots - 1)) | 1;
3285 cmp = (case_sensitivity == case_sensitive_on ? strcmp : strcasecmp);
3289 /* Convert a slot number to an offset into the table. */
3290 offset_type i = 2 * slot;
3292 if (index->symbol_table[i] == 0 && index->symbol_table[i + 1] == 0)
3295 str = index->constant_pool + MAYBE_SWAP (index->symbol_table[i]);
3296 if (!cmp (name, str))
3298 *vec_out = (offset_type *) (index->constant_pool
3299 + MAYBE_SWAP (index->symbol_table[i + 1]));
3303 slot = (slot + step) & (index->symbol_table_slots - 1);
3307 /* A helper function that reads the .gdb_index from SECTION and fills
3308 in MAP. FILENAME is the name of the file containing the section;
3309 it is used for error reporting. DEPRECATED_OK is nonzero if it is
3310 ok to use deprecated sections.
3312 CU_LIST, CU_LIST_ELEMENTS, TYPES_LIST, and TYPES_LIST_ELEMENTS are
3313 out parameters that are filled in with information about the CU and
3314 TU lists in the section.
3316 Returns 1 if all went well, 0 otherwise. */
3319 read_index_from_section (struct objfile *objfile,
3320 const char *filename,
3322 struct dwarf2_section_info *section,
3323 struct mapped_index *map,
3324 const gdb_byte **cu_list,
3325 offset_type *cu_list_elements,
3326 const gdb_byte **types_list,
3327 offset_type *types_list_elements)
3329 const gdb_byte *addr;
3330 offset_type version;
3331 offset_type *metadata;
3334 if (dwarf2_section_empty_p (section))
3337 /* Older elfutils strip versions could keep the section in the main
3338 executable while splitting it for the separate debug info file. */
3339 if ((get_section_flags (section) & SEC_HAS_CONTENTS) == 0)
3342 dwarf2_read_section (objfile, section);
3344 addr = section->buffer;
3345 /* Version check. */
3346 version = MAYBE_SWAP (*(offset_type *) addr);
3347 /* Versions earlier than 3 emitted every copy of a psymbol. This
3348 causes the index to behave very poorly for certain requests. Version 3
3349 contained incomplete addrmap. So, it seems better to just ignore such
3353 static int warning_printed = 0;
3354 if (!warning_printed)
3356 warning (_("Skipping obsolete .gdb_index section in %s."),
3358 warning_printed = 1;
3362 /* Index version 4 uses a different hash function than index version
3365 Versions earlier than 6 did not emit psymbols for inlined
3366 functions. Using these files will cause GDB not to be able to
3367 set breakpoints on inlined functions by name, so we ignore these
3368 indices unless the user has done
3369 "set use-deprecated-index-sections on". */
3370 if (version < 6 && !deprecated_ok)
3372 static int warning_printed = 0;
3373 if (!warning_printed)
3376 Skipping deprecated .gdb_index section in %s.\n\
3377 Do \"set use-deprecated-index-sections on\" before the file is read\n\
3378 to use the section anyway."),
3380 warning_printed = 1;
3384 /* Version 7 indices generated by gold refer to the CU for a symbol instead
3385 of the TU (for symbols coming from TUs),
3386 http://sourceware.org/bugzilla/show_bug.cgi?id=15021.
3387 Plus gold-generated indices can have duplicate entries for global symbols,
3388 http://sourceware.org/bugzilla/show_bug.cgi?id=15646.
3389 These are just performance bugs, and we can't distinguish gdb-generated
3390 indices from gold-generated ones, so issue no warning here. */
3392 /* Indexes with higher version than the one supported by GDB may be no
3393 longer backward compatible. */
3397 map->version = version;
3398 map->total_size = section->size;
3400 metadata = (offset_type *) (addr + sizeof (offset_type));
3403 *cu_list = addr + MAYBE_SWAP (metadata[i]);
3404 *cu_list_elements = ((MAYBE_SWAP (metadata[i + 1]) - MAYBE_SWAP (metadata[i]))
3408 *types_list = addr + MAYBE_SWAP (metadata[i]);
3409 *types_list_elements = ((MAYBE_SWAP (metadata[i + 1])
3410 - MAYBE_SWAP (metadata[i]))
3414 map->address_table = addr + MAYBE_SWAP (metadata[i]);
3415 map->address_table_size = (MAYBE_SWAP (metadata[i + 1])
3416 - MAYBE_SWAP (metadata[i]));
3419 map->symbol_table = (offset_type *) (addr + MAYBE_SWAP (metadata[i]));
3420 map->symbol_table_slots = ((MAYBE_SWAP (metadata[i + 1])
3421 - MAYBE_SWAP (metadata[i]))
3422 / (2 * sizeof (offset_type)));
3425 map->constant_pool = (char *) (addr + MAYBE_SWAP (metadata[i]));
3431 /* Read the index file. If everything went ok, initialize the "quick"
3432 elements of all the CUs and return 1. Otherwise, return 0. */
3435 dwarf2_read_index (struct objfile *objfile)
3437 struct mapped_index local_map, *map;
3438 const gdb_byte *cu_list, *types_list, *dwz_list = NULL;
3439 offset_type cu_list_elements, types_list_elements, dwz_list_elements = 0;
3440 struct dwz_file *dwz;
3442 if (!read_index_from_section (objfile, objfile_name (objfile),
3443 use_deprecated_index_sections,
3444 &dwarf2_per_objfile->gdb_index, &local_map,
3445 &cu_list, &cu_list_elements,
3446 &types_list, &types_list_elements))
3449 /* Don't use the index if it's empty. */
3450 if (local_map.symbol_table_slots == 0)
3453 /* If there is a .dwz file, read it so we can get its CU list as
3455 dwz = dwarf2_get_dwz_file ();
3458 struct mapped_index dwz_map;
3459 const gdb_byte *dwz_types_ignore;
3460 offset_type dwz_types_elements_ignore;
3462 if (!read_index_from_section (objfile, bfd_get_filename (dwz->dwz_bfd),
3464 &dwz->gdb_index, &dwz_map,
3465 &dwz_list, &dwz_list_elements,
3467 &dwz_types_elements_ignore))
3469 warning (_("could not read '.gdb_index' section from %s; skipping"),
3470 bfd_get_filename (dwz->dwz_bfd));
3475 create_cus_from_index (objfile, cu_list, cu_list_elements, dwz_list,
3478 if (types_list_elements)
3480 struct dwarf2_section_info *section;
3482 /* We can only handle a single .debug_types when we have an
3484 if (VEC_length (dwarf2_section_info_def, dwarf2_per_objfile->types) != 1)
3487 section = VEC_index (dwarf2_section_info_def,
3488 dwarf2_per_objfile->types, 0);
3490 create_signatured_type_table_from_index (objfile, section, types_list,
3491 types_list_elements);
3494 create_addrmap_from_index (objfile, &local_map);
3496 map = XOBNEW (&objfile->objfile_obstack, struct mapped_index);
3497 map = new (map) mapped_index ();
3500 dwarf2_per_objfile->index_table = map;
3501 dwarf2_per_objfile->using_index = 1;
3502 dwarf2_per_objfile->quick_file_names_table =
3503 create_quick_file_names_table (dwarf2_per_objfile->n_comp_units);
3508 /* A helper for the "quick" functions which sets the global
3509 dwarf2_per_objfile according to OBJFILE. */
3512 dw2_setup (struct objfile *objfile)
3514 dwarf2_per_objfile = ((struct dwarf2_per_objfile *)
3515 objfile_data (objfile, dwarf2_objfile_data_key));
3516 gdb_assert (dwarf2_per_objfile);
3519 /* die_reader_func for dw2_get_file_names. */
3522 dw2_get_file_names_reader (const struct die_reader_specs *reader,
3523 const gdb_byte *info_ptr,
3524 struct die_info *comp_unit_die,
3528 struct dwarf2_cu *cu = reader->cu;
3529 struct dwarf2_per_cu_data *this_cu = cu->per_cu;
3530 struct objfile *objfile = dwarf2_per_objfile->objfile;
3531 struct dwarf2_per_cu_data *lh_cu;
3532 struct attribute *attr;
3535 struct quick_file_names *qfn;
3537 gdb_assert (! this_cu->is_debug_types);
3539 /* Our callers never want to match partial units -- instead they
3540 will match the enclosing full CU. */
3541 if (comp_unit_die->tag == DW_TAG_partial_unit)
3543 this_cu->v.quick->no_file_data = 1;
3551 sect_offset line_offset {};
3553 attr = dwarf2_attr (comp_unit_die, DW_AT_stmt_list, cu);
3556 struct quick_file_names find_entry;
3558 line_offset = (sect_offset) DW_UNSND (attr);
3560 /* We may have already read in this line header (TU line header sharing).
3561 If we have we're done. */
3562 find_entry.hash.dwo_unit = cu->dwo_unit;
3563 find_entry.hash.line_sect_off = line_offset;
3564 slot = htab_find_slot (dwarf2_per_objfile->quick_file_names_table,
3565 &find_entry, INSERT);
3568 lh_cu->v.quick->file_names = (struct quick_file_names *) *slot;
3572 lh = dwarf_decode_line_header (line_offset, cu);
3576 lh_cu->v.quick->no_file_data = 1;
3580 qfn = XOBNEW (&objfile->objfile_obstack, struct quick_file_names);
3581 qfn->hash.dwo_unit = cu->dwo_unit;
3582 qfn->hash.line_sect_off = line_offset;
3583 gdb_assert (slot != NULL);
3586 file_and_directory fnd = find_file_and_directory (comp_unit_die, cu);
3588 qfn->num_file_names = lh->file_names.size ();
3590 XOBNEWVEC (&objfile->objfile_obstack, const char *, lh->file_names.size ());
3591 for (i = 0; i < lh->file_names.size (); ++i)
3592 qfn->file_names[i] = file_full_name (i + 1, lh.get (), fnd.comp_dir);
3593 qfn->real_names = NULL;
3595 lh_cu->v.quick->file_names = qfn;
3598 /* A helper for the "quick" functions which attempts to read the line
3599 table for THIS_CU. */
3601 static struct quick_file_names *
3602 dw2_get_file_names (struct dwarf2_per_cu_data *this_cu)
3604 /* This should never be called for TUs. */
3605 gdb_assert (! this_cu->is_debug_types);
3606 /* Nor type unit groups. */
3607 gdb_assert (! IS_TYPE_UNIT_GROUP (this_cu));
3609 if (this_cu->v.quick->file_names != NULL)
3610 return this_cu->v.quick->file_names;
3611 /* If we know there is no line data, no point in looking again. */
3612 if (this_cu->v.quick->no_file_data)
3615 init_cutu_and_read_dies_simple (this_cu, dw2_get_file_names_reader, NULL);
3617 if (this_cu->v.quick->no_file_data)
3619 return this_cu->v.quick->file_names;
3622 /* A helper for the "quick" functions which computes and caches the
3623 real path for a given file name from the line table. */
3626 dw2_get_real_path (struct objfile *objfile,
3627 struct quick_file_names *qfn, int index)
3629 if (qfn->real_names == NULL)
3630 qfn->real_names = OBSTACK_CALLOC (&objfile->objfile_obstack,
3631 qfn->num_file_names, const char *);
3633 if (qfn->real_names[index] == NULL)
3634 qfn->real_names[index] = gdb_realpath (qfn->file_names[index]).release ();
3636 return qfn->real_names[index];
3639 static struct symtab *
3640 dw2_find_last_source_symtab (struct objfile *objfile)
3642 struct compunit_symtab *cust;
3645 dw2_setup (objfile);
3646 index = dwarf2_per_objfile->n_comp_units - 1;
3647 cust = dw2_instantiate_symtab (dw2_get_cutu (index));
3650 return compunit_primary_filetab (cust);
3653 /* Traversal function for dw2_forget_cached_source_info. */
3656 dw2_free_cached_file_names (void **slot, void *info)
3658 struct quick_file_names *file_data = (struct quick_file_names *) *slot;
3660 if (file_data->real_names)
3664 for (i = 0; i < file_data->num_file_names; ++i)
3666 xfree ((void*) file_data->real_names[i]);
3667 file_data->real_names[i] = NULL;
3675 dw2_forget_cached_source_info (struct objfile *objfile)
3677 dw2_setup (objfile);
3679 htab_traverse_noresize (dwarf2_per_objfile->quick_file_names_table,
3680 dw2_free_cached_file_names, NULL);
3683 /* Helper function for dw2_map_symtabs_matching_filename that expands
3684 the symtabs and calls the iterator. */
3687 dw2_map_expand_apply (struct objfile *objfile,
3688 struct dwarf2_per_cu_data *per_cu,
3689 const char *name, const char *real_path,
3690 gdb::function_view<bool (symtab *)> callback)
3692 struct compunit_symtab *last_made = objfile->compunit_symtabs;
3694 /* Don't visit already-expanded CUs. */
3695 if (per_cu->v.quick->compunit_symtab)
3698 /* This may expand more than one symtab, and we want to iterate over
3700 dw2_instantiate_symtab (per_cu);
3702 return iterate_over_some_symtabs (name, real_path, objfile->compunit_symtabs,
3703 last_made, callback);
3706 /* Implementation of the map_symtabs_matching_filename method. */
3709 dw2_map_symtabs_matching_filename
3710 (struct objfile *objfile, const char *name, const char *real_path,
3711 gdb::function_view<bool (symtab *)> callback)
3714 const char *name_basename = lbasename (name);
3716 dw2_setup (objfile);
3718 /* The rule is CUs specify all the files, including those used by
3719 any TU, so there's no need to scan TUs here. */
3721 for (i = 0; i < dwarf2_per_objfile->n_comp_units; ++i)
3724 struct dwarf2_per_cu_data *per_cu = dw2_get_cu (i);
3725 struct quick_file_names *file_data;
3727 /* We only need to look at symtabs not already expanded. */
3728 if (per_cu->v.quick->compunit_symtab)
3731 file_data = dw2_get_file_names (per_cu);
3732 if (file_data == NULL)
3735 for (j = 0; j < file_data->num_file_names; ++j)
3737 const char *this_name = file_data->file_names[j];
3738 const char *this_real_name;
3740 if (compare_filenames_for_search (this_name, name))
3742 if (dw2_map_expand_apply (objfile, per_cu, name, real_path,
3748 /* Before we invoke realpath, which can get expensive when many
3749 files are involved, do a quick comparison of the basenames. */
3750 if (! basenames_may_differ
3751 && FILENAME_CMP (lbasename (this_name), name_basename) != 0)
3754 this_real_name = dw2_get_real_path (objfile, file_data, j);
3755 if (compare_filenames_for_search (this_real_name, name))
3757 if (dw2_map_expand_apply (objfile, per_cu, name, real_path,
3763 if (real_path != NULL)
3765 gdb_assert (IS_ABSOLUTE_PATH (real_path));
3766 gdb_assert (IS_ABSOLUTE_PATH (name));
3767 if (this_real_name != NULL
3768 && FILENAME_CMP (real_path, this_real_name) == 0)
3770 if (dw2_map_expand_apply (objfile, per_cu, name, real_path,
3782 /* Struct used to manage iterating over all CUs looking for a symbol. */
3784 struct dw2_symtab_iterator
3786 /* The internalized form of .gdb_index. */
3787 struct mapped_index *index;
3788 /* If non-zero, only look for symbols that match BLOCK_INDEX. */
3789 int want_specific_block;
3790 /* One of GLOBAL_BLOCK or STATIC_BLOCK.
3791 Unused if !WANT_SPECIFIC_BLOCK. */
3793 /* The kind of symbol we're looking for. */
3795 /* The list of CUs from the index entry of the symbol,
3796 or NULL if not found. */
3798 /* The next element in VEC to look at. */
3800 /* The number of elements in VEC, or zero if there is no match. */
3802 /* Have we seen a global version of the symbol?
3803 If so we can ignore all further global instances.
3804 This is to work around gold/15646, inefficient gold-generated
3809 /* Initialize the index symtab iterator ITER.
3810 If WANT_SPECIFIC_BLOCK is non-zero, only look for symbols
3811 in block BLOCK_INDEX. Otherwise BLOCK_INDEX is ignored. */
3814 dw2_symtab_iter_init (struct dw2_symtab_iterator *iter,
3815 struct mapped_index *index,
3816 int want_specific_block,
3821 iter->index = index;
3822 iter->want_specific_block = want_specific_block;
3823 iter->block_index = block_index;
3824 iter->domain = domain;
3826 iter->global_seen = 0;
3828 if (find_slot_in_mapped_hash (index, name, &iter->vec))
3829 iter->length = MAYBE_SWAP (*iter->vec);
3837 /* Return the next matching CU or NULL if there are no more. */
3839 static struct dwarf2_per_cu_data *
3840 dw2_symtab_iter_next (struct dw2_symtab_iterator *iter)
3842 for ( ; iter->next < iter->length; ++iter->next)
3844 offset_type cu_index_and_attrs =
3845 MAYBE_SWAP (iter->vec[iter->next + 1]);
3846 offset_type cu_index = GDB_INDEX_CU_VALUE (cu_index_and_attrs);
3847 struct dwarf2_per_cu_data *per_cu;
3848 int want_static = iter->block_index != GLOBAL_BLOCK;
3849 /* This value is only valid for index versions >= 7. */
3850 int is_static = GDB_INDEX_SYMBOL_STATIC_VALUE (cu_index_and_attrs);
3851 gdb_index_symbol_kind symbol_kind =
3852 GDB_INDEX_SYMBOL_KIND_VALUE (cu_index_and_attrs);
3853 /* Only check the symbol attributes if they're present.
3854 Indices prior to version 7 don't record them,
3855 and indices >= 7 may elide them for certain symbols
3856 (gold does this). */
3858 (iter->index->version >= 7
3859 && symbol_kind != GDB_INDEX_SYMBOL_KIND_NONE);
3861 /* Don't crash on bad data. */
3862 if (cu_index >= (dwarf2_per_objfile->n_comp_units
3863 + dwarf2_per_objfile->n_type_units))
3865 complaint (&symfile_complaints,
3866 _(".gdb_index entry has bad CU index"
3868 objfile_name (dwarf2_per_objfile->objfile));
3872 per_cu = dw2_get_cutu (cu_index);
3874 /* Skip if already read in. */
3875 if (per_cu->v.quick->compunit_symtab)
3878 /* Check static vs global. */
3881 if (iter->want_specific_block
3882 && want_static != is_static)
3884 /* Work around gold/15646. */
3885 if (!is_static && iter->global_seen)
3888 iter->global_seen = 1;
3891 /* Only check the symbol's kind if it has one. */
3894 switch (iter->domain)
3897 if (symbol_kind != GDB_INDEX_SYMBOL_KIND_VARIABLE
3898 && symbol_kind != GDB_INDEX_SYMBOL_KIND_FUNCTION
3899 /* Some types are also in VAR_DOMAIN. */
3900 && symbol_kind != GDB_INDEX_SYMBOL_KIND_TYPE)
3904 if (symbol_kind != GDB_INDEX_SYMBOL_KIND_TYPE)
3908 if (symbol_kind != GDB_INDEX_SYMBOL_KIND_OTHER)
3923 static struct compunit_symtab *
3924 dw2_lookup_symbol (struct objfile *objfile, int block_index,
3925 const char *name, domain_enum domain)
3927 struct compunit_symtab *stab_best = NULL;
3928 struct mapped_index *index;
3930 dw2_setup (objfile);
3932 lookup_name_info lookup_name (name, symbol_name_match_type::FULL);
3934 index = dwarf2_per_objfile->index_table;
3936 /* index is NULL if OBJF_READNOW. */
3939 struct dw2_symtab_iterator iter;
3940 struct dwarf2_per_cu_data *per_cu;
3942 dw2_symtab_iter_init (&iter, index, 1, block_index, domain, name);
3944 while ((per_cu = dw2_symtab_iter_next (&iter)) != NULL)
3946 struct symbol *sym, *with_opaque = NULL;
3947 struct compunit_symtab *stab = dw2_instantiate_symtab (per_cu);
3948 const struct blockvector *bv = COMPUNIT_BLOCKVECTOR (stab);
3949 struct block *block = BLOCKVECTOR_BLOCK (bv, block_index);
3951 sym = block_find_symbol (block, name, domain,
3952 block_find_non_opaque_type_preferred,
3955 /* Some caution must be observed with overloaded functions
3956 and methods, since the index will not contain any overload
3957 information (but NAME might contain it). */
3960 && SYMBOL_MATCHES_SEARCH_NAME (sym, lookup_name))
3962 if (with_opaque != NULL
3963 && SYMBOL_MATCHES_SEARCH_NAME (with_opaque, lookup_name))
3966 /* Keep looking through other CUs. */
3974 dw2_print_stats (struct objfile *objfile)
3976 int i, total, count;
3978 dw2_setup (objfile);
3979 total = dwarf2_per_objfile->n_comp_units + dwarf2_per_objfile->n_type_units;
3981 for (i = 0; i < total; ++i)
3983 struct dwarf2_per_cu_data *per_cu = dw2_get_cutu (i);
3985 if (!per_cu->v.quick->compunit_symtab)
3988 printf_filtered (_(" Number of read CUs: %d\n"), total - count);
3989 printf_filtered (_(" Number of unread CUs: %d\n"), count);
3992 /* This dumps minimal information about the index.
3993 It is called via "mt print objfiles".
3994 One use is to verify .gdb_index has been loaded by the
3995 gdb.dwarf2/gdb-index.exp testcase. */
3998 dw2_dump (struct objfile *objfile)
4000 dw2_setup (objfile);
4001 gdb_assert (dwarf2_per_objfile->using_index);
4002 printf_filtered (".gdb_index:");
4003 if (dwarf2_per_objfile->index_table != NULL)
4005 printf_filtered (" version %d\n",
4006 dwarf2_per_objfile->index_table->version);
4009 printf_filtered (" faked for \"readnow\"\n");
4010 printf_filtered ("\n");
4014 dw2_relocate (struct objfile *objfile,
4015 const struct section_offsets *new_offsets,
4016 const struct section_offsets *delta)
4018 /* There's nothing to relocate here. */
4022 dw2_expand_symtabs_for_function (struct objfile *objfile,
4023 const char *func_name)
4025 struct mapped_index *index;
4027 dw2_setup (objfile);
4029 index = dwarf2_per_objfile->index_table;
4031 /* index is NULL if OBJF_READNOW. */
4034 struct dw2_symtab_iterator iter;
4035 struct dwarf2_per_cu_data *per_cu;
4037 /* Note: It doesn't matter what we pass for block_index here. */
4038 dw2_symtab_iter_init (&iter, index, 0, GLOBAL_BLOCK, VAR_DOMAIN,
4041 while ((per_cu = dw2_symtab_iter_next (&iter)) != NULL)
4042 dw2_instantiate_symtab (per_cu);
4047 dw2_expand_all_symtabs (struct objfile *objfile)
4051 dw2_setup (objfile);
4053 for (i = 0; i < (dwarf2_per_objfile->n_comp_units
4054 + dwarf2_per_objfile->n_type_units); ++i)
4056 struct dwarf2_per_cu_data *per_cu = dw2_get_cutu (i);
4058 dw2_instantiate_symtab (per_cu);
4063 dw2_expand_symtabs_with_fullname (struct objfile *objfile,
4064 const char *fullname)
4068 dw2_setup (objfile);
4070 /* We don't need to consider type units here.
4071 This is only called for examining code, e.g. expand_line_sal.
4072 There can be an order of magnitude (or more) more type units
4073 than comp units, and we avoid them if we can. */
4075 for (i = 0; i < dwarf2_per_objfile->n_comp_units; ++i)
4078 struct dwarf2_per_cu_data *per_cu = dw2_get_cutu (i);
4079 struct quick_file_names *file_data;
4081 /* We only need to look at symtabs not already expanded. */
4082 if (per_cu->v.quick->compunit_symtab)
4085 file_data = dw2_get_file_names (per_cu);
4086 if (file_data == NULL)
4089 for (j = 0; j < file_data->num_file_names; ++j)
4091 const char *this_fullname = file_data->file_names[j];
4093 if (filename_cmp (this_fullname, fullname) == 0)
4095 dw2_instantiate_symtab (per_cu);
4103 dw2_map_matching_symbols (struct objfile *objfile,
4104 const char * name, domain_enum domain,
4106 int (*callback) (struct block *,
4107 struct symbol *, void *),
4108 void *data, symbol_name_match_type match,
4109 symbol_compare_ftype *ordered_compare)
4111 /* Currently unimplemented; used for Ada. The function can be called if the
4112 current language is Ada for a non-Ada objfile using GNU index. As Ada
4113 does not look for non-Ada symbols this function should just return. */
4116 /* Symbol name matcher for .gdb_index names.
4118 Symbol names in .gdb_index have a few particularities:
4120 - There's no indication of which is the language of each symbol.
4122 Since each language has its own symbol name matching algorithm,
4123 and we don't know which language is the right one, we must match
4124 each symbol against all languages. This would be a potential
4125 performance problem if it were not mitigated by the
4126 mapped_index::name_components lookup table, which significantly
4127 reduces the number of times we need to call into this matcher,
4128 making it a non-issue.
4130 - Symbol names in the index have no overload (parameter)
4131 information. I.e., in C++, "foo(int)" and "foo(long)" both
4132 appear as "foo" in the index, for example.
4134 This means that the lookup names passed to the symbol name
4135 matcher functions must have no parameter information either
4136 because (e.g.) symbol search name "foo" does not match
4137 lookup-name "foo(int)" [while swapping search name for lookup
4140 class gdb_index_symbol_name_matcher
4143 /* Prepares the vector of comparison functions for LOOKUP_NAME. */
4144 gdb_index_symbol_name_matcher (const lookup_name_info &lookup_name);
4146 /* Walk all the matcher routines and match SYMBOL_NAME against them.
4147 Returns true if any matcher matches. */
4148 bool matches (const char *symbol_name);
4151 /* A reference to the lookup name we're matching against. */
4152 const lookup_name_info &m_lookup_name;
4154 /* A vector holding all the different symbol name matchers, for all
4156 std::vector<symbol_name_matcher_ftype *> m_symbol_name_matcher_funcs;
4159 gdb_index_symbol_name_matcher::gdb_index_symbol_name_matcher
4160 (const lookup_name_info &lookup_name)
4161 : m_lookup_name (lookup_name)
4163 /* Prepare the vector of comparison functions upfront, to avoid
4164 doing the same work for each symbol. Care is taken to avoid
4165 matching with the same matcher more than once if/when multiple
4166 languages use the same matcher function. */
4167 auto &matchers = m_symbol_name_matcher_funcs;
4168 matchers.reserve (nr_languages);
4170 matchers.push_back (default_symbol_name_matcher);
4172 for (int i = 0; i < nr_languages; i++)
4174 const language_defn *lang = language_def ((enum language) i);
4175 if (lang->la_get_symbol_name_matcher != NULL)
4177 symbol_name_matcher_ftype *name_matcher
4178 = lang->la_get_symbol_name_matcher (m_lookup_name);
4180 /* Don't insert the same comparison routine more than once.
4181 Note that we do this linear walk instead of a cheaper
4182 sorted insert, or use a std::set or something like that,
4183 because relative order of function addresses is not
4184 stable. This is not a problem in practice because the
4185 number of supported languages is low, and the cost here
4186 is tiny compared to the number of searches we'll do
4187 afterwards using this object. */
4188 if (std::find (matchers.begin (), matchers.end (), name_matcher)
4190 matchers.push_back (name_matcher);
4196 gdb_index_symbol_name_matcher::matches (const char *symbol_name)
4198 for (auto matches_name : m_symbol_name_matcher_funcs)
4199 if (matches_name (symbol_name, m_lookup_name, NULL))
4205 /* Starting from a search name, return the string that finds the upper
4206 bound of all strings that start with SEARCH_NAME in a sorted name
4207 list. Returns the empty string to indicate that the upper bound is
4208 the end of the list. */
4211 make_sort_after_prefix_name (const char *search_name)
4213 /* When looking to complete "func", we find the upper bound of all
4214 symbols that start with "func" by looking for where we'd insert
4215 the closest string that would follow "func" in lexicographical
4216 order. Usually, that's "func"-with-last-character-incremented,
4217 i.e. "fund". Mind non-ASCII characters, though. Usually those
4218 will be UTF-8 multi-byte sequences, but we can't be certain.
4219 Especially mind the 0xff character, which is a valid character in
4220 non-UTF-8 source character sets (e.g. Latin1 'ÿ'), and we can't
4221 rule out compilers allowing it in identifiers. Note that
4222 conveniently, strcmp/strcasecmp are specified to compare
4223 characters interpreted as unsigned char. So what we do is treat
4224 the whole string as a base 256 number composed of a sequence of
4225 base 256 "digits" and add 1 to it. I.e., adding 1 to 0xff wraps
4226 to 0, and carries 1 to the following more-significant position.
4227 If the very first character in SEARCH_NAME ends up incremented
4228 and carries/overflows, then the upper bound is the end of the
4229 list. The string after the empty string is also the empty
4232 Some examples of this operation:
4234 SEARCH_NAME => "+1" RESULT
4238 "\xff" "a" "\xff" => "\xff" "b"
4243 Then, with these symbols for example:
4249 completing "func" looks for symbols between "func" and
4250 "func"-with-last-character-incremented, i.e. "fund" (exclusive),
4251 which finds "func" and "func1", but not "fund".
4255 funcÿ (Latin1 'ÿ' [0xff])
4259 completing "funcÿ" looks for symbols between "funcÿ" and "fund"
4260 (exclusive), which finds "funcÿ" and "funcÿ1", but not "fund".
4264 ÿÿ (Latin1 'ÿ' [0xff])
4267 completing "ÿ" or "ÿÿ" looks for symbols between between "ÿÿ" and
4268 the end of the list.
4270 std::string after = search_name;
4271 while (!after.empty () && (unsigned char) after.back () == 0xff)
4273 if (!after.empty ())
4274 after.back () = (unsigned char) after.back () + 1;
4278 /* See declaration. */
4280 std::pair<std::vector<name_component>::const_iterator,
4281 std::vector<name_component>::const_iterator>
4282 mapped_index::find_name_components_bounds
4283 (const lookup_name_info &lookup_name_without_params) const
4286 = this->name_components_casing == case_sensitive_on ? strcmp : strcasecmp;
4289 = lookup_name_without_params.cplus ().lookup_name ().c_str ();
4291 /* Comparison function object for lower_bound that matches against a
4292 given symbol name. */
4293 auto lookup_compare_lower = [&] (const name_component &elem,
4296 const char *elem_qualified = this->symbol_name_at (elem.idx);
4297 const char *elem_name = elem_qualified + elem.name_offset;
4298 return name_cmp (elem_name, name) < 0;
4301 /* Comparison function object for upper_bound that matches against a
4302 given symbol name. */
4303 auto lookup_compare_upper = [&] (const char *name,
4304 const name_component &elem)
4306 const char *elem_qualified = this->symbol_name_at (elem.idx);
4307 const char *elem_name = elem_qualified + elem.name_offset;
4308 return name_cmp (name, elem_name) < 0;
4311 auto begin = this->name_components.begin ();
4312 auto end = this->name_components.end ();
4314 /* Find the lower bound. */
4317 if (lookup_name_without_params.completion_mode () && cplus[0] == '\0')
4320 return std::lower_bound (begin, end, cplus, lookup_compare_lower);
4323 /* Find the upper bound. */
4326 if (lookup_name_without_params.completion_mode ())
4328 /* In completion mode, we want UPPER to point past all
4329 symbols names that have the same prefix. I.e., with
4330 these symbols, and completing "func":
4332 function << lower bound
4334 other_function << upper bound
4336 We find the upper bound by looking for the insertion
4337 point of "func"-with-last-character-incremented,
4339 std::string after = make_sort_after_prefix_name (cplus);
4342 return std::lower_bound (lower, end, after.c_str (),
4343 lookup_compare_lower);
4346 return std::upper_bound (lower, end, cplus, lookup_compare_upper);
4349 return {lower, upper};
4352 /* See declaration. */
4355 mapped_index::build_name_components ()
4357 if (!this->name_components.empty ())
4360 this->name_components_casing = case_sensitivity;
4362 = this->name_components_casing == case_sensitive_on ? strcmp : strcasecmp;
4364 /* The code below only knows how to break apart components of C++
4365 symbol names (and other languages that use '::' as
4366 namespace/module separator). If we add support for wild matching
4367 to some language that uses some other operator (E.g., Ada, Go and
4368 D use '.'), then we'll need to try splitting the symbol name
4369 according to that language too. Note that Ada does support wild
4370 matching, but doesn't currently support .gdb_index. */
4371 for (size_t iter = 0; iter < this->symbol_table_slots; ++iter)
4373 offset_type idx = 2 * iter;
4375 if (this->symbol_table[idx] == 0
4376 && this->symbol_table[idx + 1] == 0)
4379 const char *name = this->symbol_name_at (idx);
4381 /* Add each name component to the name component table. */
4382 unsigned int previous_len = 0;
4383 for (unsigned int current_len = cp_find_first_component (name);
4384 name[current_len] != '\0';
4385 current_len += cp_find_first_component (name + current_len))
4387 gdb_assert (name[current_len] == ':');
4388 this->name_components.push_back ({previous_len, idx});
4389 /* Skip the '::'. */
4391 previous_len = current_len;
4393 this->name_components.push_back ({previous_len, idx});
4396 /* Sort name_components elements by name. */
4397 auto name_comp_compare = [&] (const name_component &left,
4398 const name_component &right)
4400 const char *left_qualified = this->symbol_name_at (left.idx);
4401 const char *right_qualified = this->symbol_name_at (right.idx);
4403 const char *left_name = left_qualified + left.name_offset;
4404 const char *right_name = right_qualified + right.name_offset;
4406 return name_cmp (left_name, right_name) < 0;
4409 std::sort (this->name_components.begin (),
4410 this->name_components.end (),
4414 /* Helper for dw2_expand_symtabs_matching that works with a
4415 mapped_index instead of the containing objfile. This is split to a
4416 separate function in order to be able to unit test the
4417 name_components matching using a mock mapped_index. For each
4418 symbol name that matches, calls MATCH_CALLBACK, passing it the
4419 symbol's index in the mapped_index symbol table. */
4422 dw2_expand_symtabs_matching_symbol
4423 (mapped_index &index,
4424 const lookup_name_info &lookup_name_in,
4425 gdb::function_view<expand_symtabs_symbol_matcher_ftype> symbol_matcher,
4426 enum search_domain kind,
4427 gdb::function_view<void (offset_type)> match_callback)
4429 lookup_name_info lookup_name_without_params
4430 = lookup_name_in.make_ignore_params ();
4431 gdb_index_symbol_name_matcher lookup_name_matcher
4432 (lookup_name_without_params);
4434 /* Build the symbol name component sorted vector, if we haven't
4436 index.build_name_components ();
4438 auto bounds = index.find_name_components_bounds (lookup_name_without_params);
4440 /* Now for each symbol name in range, check to see if we have a name
4441 match, and if so, call the MATCH_CALLBACK callback. */
4443 /* The same symbol may appear more than once in the range though.
4444 E.g., if we're looking for symbols that complete "w", and we have
4445 a symbol named "w1::w2", we'll find the two name components for
4446 that same symbol in the range. To be sure we only call the
4447 callback once per symbol, we first collect the symbol name
4448 indexes that matched in a temporary vector and ignore
4450 std::vector<offset_type> matches;
4451 matches.reserve (std::distance (bounds.first, bounds.second));
4453 for (; bounds.first != bounds.second; ++bounds.first)
4455 const char *qualified = index.symbol_name_at (bounds.first->idx);
4457 if (!lookup_name_matcher.matches (qualified)
4458 || (symbol_matcher != NULL && !symbol_matcher (qualified)))
4461 matches.push_back (bounds.first->idx);
4464 std::sort (matches.begin (), matches.end ());
4466 /* Finally call the callback, once per match. */
4468 for (offset_type idx : matches)
4472 match_callback (idx);
4477 /* Above we use a type wider than idx's for 'prev', since 0 and
4478 (offset_type)-1 are both possible values. */
4479 static_assert (sizeof (prev) > sizeof (offset_type), "");
4484 namespace selftests { namespace dw2_expand_symtabs_matching {
4486 /* A wrapper around mapped_index that builds a mock mapped_index, from
4487 the symbol list passed as parameter to the constructor. */
4488 class mock_mapped_index
4492 mock_mapped_index (const char *(&symbols)[N])
4493 : mock_mapped_index (symbols, N)
4496 /* Access the built index. */
4497 mapped_index &index ()
4501 mock_mapped_index(const mock_mapped_index &) = delete;
4502 void operator= (const mock_mapped_index &) = delete;
4505 mock_mapped_index (const char **symbols, size_t symbols_size)
4507 /* No string can live at offset zero. Add a dummy entry. */
4508 obstack_grow_str0 (&m_constant_pool, "");
4510 for (size_t i = 0; i < symbols_size; i++)
4512 const char *sym = symbols[i];
4513 size_t offset = obstack_object_size (&m_constant_pool);
4514 obstack_grow_str0 (&m_constant_pool, sym);
4515 m_symbol_table.push_back (offset);
4516 m_symbol_table.push_back (0);
4519 m_index.constant_pool = (const char *) obstack_base (&m_constant_pool);
4520 m_index.symbol_table = m_symbol_table.data ();
4521 m_index.symbol_table_slots = m_symbol_table.size () / 2;
4525 /* The built mapped_index. */
4526 mapped_index m_index{};
4528 /* The storage that the built mapped_index uses for symbol and
4529 constant pool tables. */
4530 std::vector<offset_type> m_symbol_table;
4531 auto_obstack m_constant_pool;
4534 /* Convenience function that converts a NULL pointer to a "<null>"
4535 string, to pass to print routines. */
4538 string_or_null (const char *str)
4540 return str != NULL ? str : "<null>";
4543 /* Check if a lookup_name_info built from
4544 NAME/MATCH_TYPE/COMPLETION_MODE matches the symbols in the mock
4545 index. EXPECTED_LIST is the list of expected matches, in expected
4546 matching order. If no match expected, then an empty list is
4547 specified. Returns true on success. On failure prints a warning
4548 indicating the file:line that failed, and returns false. */
4551 check_match (const char *file, int line,
4552 mock_mapped_index &mock_index,
4553 const char *name, symbol_name_match_type match_type,
4554 bool completion_mode,
4555 std::initializer_list<const char *> expected_list)
4557 lookup_name_info lookup_name (name, match_type, completion_mode);
4559 bool matched = true;
4561 auto mismatch = [&] (const char *expected_str,
4564 warning (_("%s:%d: match_type=%s, looking-for=\"%s\", "
4565 "expected=\"%s\", got=\"%s\"\n"),
4567 (match_type == symbol_name_match_type::FULL
4569 name, string_or_null (expected_str), string_or_null (got));
4573 auto expected_it = expected_list.begin ();
4574 auto expected_end = expected_list.end ();
4576 dw2_expand_symtabs_matching_symbol (mock_index.index (), lookup_name,
4578 [&] (offset_type idx)
4580 const char *matched_name = mock_index.index ().symbol_name_at (idx);
4581 const char *expected_str
4582 = expected_it == expected_end ? NULL : *expected_it++;
4584 if (expected_str == NULL || strcmp (expected_str, matched_name) != 0)
4585 mismatch (expected_str, matched_name);
4588 const char *expected_str
4589 = expected_it == expected_end ? NULL : *expected_it++;
4590 if (expected_str != NULL)
4591 mismatch (expected_str, NULL);
4596 /* The symbols added to the mock mapped_index for testing (in
4598 static const char *test_symbols[] = {
4607 "ns2::tmpl<int>::foo2",
4608 "(anonymous namespace)::A::B::C",
4610 /* These are used to check that the increment-last-char in the
4611 matching algorithm for completion doesn't match "t1_fund" when
4612 completing "t1_func". */
4618 /* A UTF-8 name with multi-byte sequences to make sure that
4619 cp-name-parser understands this as a single identifier ("função"
4620 is "function" in PT). */
4623 /* \377 (0xff) is Latin1 'ÿ'. */
4626 /* \377 (0xff) is Latin1 'ÿ'. */
4630 /* A name with all sorts of complications. Starts with "z" to make
4631 it easier for the completion tests below. */
4632 #define Z_SYM_NAME \
4633 "z::std::tuple<(anonymous namespace)::ui*, std::bar<(anonymous namespace)::ui> >" \
4634 "::tuple<(anonymous namespace)::ui*, " \
4635 "std::default_delete<(anonymous namespace)::ui>, void>"
4640 /* Returns true if the mapped_index::find_name_component_bounds method
4641 finds EXPECTED_SYMS in INDEX when looking for SEARCH_NAME, in
4645 check_find_bounds_finds (mapped_index &index,
4646 const char *search_name,
4647 gdb::array_view<const char *> expected_syms)
4649 lookup_name_info lookup_name (search_name,
4650 symbol_name_match_type::FULL, true);
4652 auto bounds = index.find_name_components_bounds (lookup_name);
4654 size_t distance = std::distance (bounds.first, bounds.second);
4655 if (distance != expected_syms.size ())
4658 for (size_t exp_elem = 0; exp_elem < distance; exp_elem++)
4660 auto nc_elem = bounds.first + exp_elem;
4661 const char *qualified = index.symbol_name_at (nc_elem->idx);
4662 if (strcmp (qualified, expected_syms[exp_elem]) != 0)
4669 /* Test the lower-level mapped_index::find_name_component_bounds
4673 test_mapped_index_find_name_component_bounds ()
4675 mock_mapped_index mock_index (test_symbols);
4677 mock_index.index ().build_name_components ();
4679 /* Test the lower-level mapped_index::find_name_component_bounds
4680 method in completion mode. */
4682 static const char *expected_syms[] = {
4687 SELF_CHECK (check_find_bounds_finds (mock_index.index (),
4688 "t1_func", expected_syms));
4691 /* Check that the increment-last-char in the name matching algorithm
4692 for completion doesn't get confused with Ansi1 'ÿ' / 0xff. */
4694 static const char *expected_syms1[] = {
4698 SELF_CHECK (check_find_bounds_finds (mock_index.index (),
4699 "\377", expected_syms1));
4701 static const char *expected_syms2[] = {
4704 SELF_CHECK (check_find_bounds_finds (mock_index.index (),
4705 "\377\377", expected_syms2));
4709 /* Test dw2_expand_symtabs_matching_symbol. */
4712 test_dw2_expand_symtabs_matching_symbol ()
4714 mock_mapped_index mock_index (test_symbols);
4716 /* We let all tests run until the end even if some fails, for debug
4718 bool any_mismatch = false;
4720 /* Create the expected symbols list (an initializer_list). Needed
4721 because lists have commas, and we need to pass them to CHECK,
4722 which is a macro. */
4723 #define EXPECT(...) { __VA_ARGS__ }
4725 /* Wrapper for check_match that passes down the current
4726 __FILE__/__LINE__. */
4727 #define CHECK_MATCH(NAME, MATCH_TYPE, COMPLETION_MODE, EXPECTED_LIST) \
4728 any_mismatch |= !check_match (__FILE__, __LINE__, \
4730 NAME, MATCH_TYPE, COMPLETION_MODE, \
4733 /* Identity checks. */
4734 for (const char *sym : test_symbols)
4736 /* Should be able to match all existing symbols. */
4737 CHECK_MATCH (sym, symbol_name_match_type::FULL, false,
4740 /* Should be able to match all existing symbols with
4742 std::string with_params = std::string (sym) + "(int)";
4743 CHECK_MATCH (with_params.c_str (), symbol_name_match_type::FULL, false,
4746 /* Should be able to match all existing symbols with
4747 parameters and qualifiers. */
4748 with_params = std::string (sym) + " ( int ) const";
4749 CHECK_MATCH (with_params.c_str (), symbol_name_match_type::FULL, false,
4752 /* This should really find sym, but cp-name-parser.y doesn't
4753 know about lvalue/rvalue qualifiers yet. */
4754 with_params = std::string (sym) + " ( int ) &&";
4755 CHECK_MATCH (with_params.c_str (), symbol_name_match_type::FULL, false,
4759 /* Check that the name matching algorithm for completion doesn't get
4760 confused with Latin1 'ÿ' / 0xff. */
4762 static const char str[] = "\377";
4763 CHECK_MATCH (str, symbol_name_match_type::FULL, true,
4764 EXPECT ("\377", "\377\377123"));
4767 /* Check that the increment-last-char in the matching algorithm for
4768 completion doesn't match "t1_fund" when completing "t1_func". */
4770 static const char str[] = "t1_func";
4771 CHECK_MATCH (str, symbol_name_match_type::FULL, true,
4772 EXPECT ("t1_func", "t1_func1"));
4775 /* Check that completion mode works at each prefix of the expected
4778 static const char str[] = "function(int)";
4779 size_t len = strlen (str);
4782 for (size_t i = 1; i < len; i++)
4784 lookup.assign (str, i);
4785 CHECK_MATCH (lookup.c_str (), symbol_name_match_type::FULL, true,
4786 EXPECT ("function"));
4790 /* While "w" is a prefix of both components, the match function
4791 should still only be called once. */
4793 CHECK_MATCH ("w", symbol_name_match_type::FULL, true,
4795 CHECK_MATCH ("w", symbol_name_match_type::WILD, true,
4799 /* Same, with a "complicated" symbol. */
4801 static const char str[] = Z_SYM_NAME;
4802 size_t len = strlen (str);
4805 for (size_t i = 1; i < len; i++)
4807 lookup.assign (str, i);
4808 CHECK_MATCH (lookup.c_str (), symbol_name_match_type::FULL, true,
4809 EXPECT (Z_SYM_NAME));
4813 /* In FULL mode, an incomplete symbol doesn't match. */
4815 CHECK_MATCH ("std::zfunction(int", symbol_name_match_type::FULL, false,
4819 /* A complete symbol with parameters matches any overload, since the
4820 index has no overload info. */
4822 CHECK_MATCH ("std::zfunction(int)", symbol_name_match_type::FULL, true,
4823 EXPECT ("std::zfunction", "std::zfunction2"));
4824 CHECK_MATCH ("zfunction(int)", symbol_name_match_type::WILD, true,
4825 EXPECT ("std::zfunction", "std::zfunction2"));
4826 CHECK_MATCH ("zfunc", symbol_name_match_type::WILD, true,
4827 EXPECT ("std::zfunction", "std::zfunction2"));
4830 /* Check that whitespace is ignored appropriately. A symbol with a
4831 template argument list. */
4833 static const char expected[] = "ns::foo<int>";
4834 CHECK_MATCH ("ns :: foo < int > ", symbol_name_match_type::FULL, false,
4836 CHECK_MATCH ("foo < int > ", symbol_name_match_type::WILD, false,
4840 /* Check that whitespace is ignored appropriately. A symbol with a
4841 template argument list that includes a pointer. */
4843 static const char expected[] = "ns::foo<char*>";
4844 /* Try both completion and non-completion modes. */
4845 static const bool completion_mode[2] = {false, true};
4846 for (size_t i = 0; i < 2; i++)
4848 CHECK_MATCH ("ns :: foo < char * >", symbol_name_match_type::FULL,
4849 completion_mode[i], EXPECT (expected));
4850 CHECK_MATCH ("foo < char * >", symbol_name_match_type::WILD,
4851 completion_mode[i], EXPECT (expected));
4853 CHECK_MATCH ("ns :: foo < char * > (int)", symbol_name_match_type::FULL,
4854 completion_mode[i], EXPECT (expected));
4855 CHECK_MATCH ("foo < char * > (int)", symbol_name_match_type::WILD,
4856 completion_mode[i], EXPECT (expected));
4861 /* Check method qualifiers are ignored. */
4862 static const char expected[] = "ns::foo<char*>";
4863 CHECK_MATCH ("ns :: foo < char * > ( int ) const",
4864 symbol_name_match_type::FULL, true, EXPECT (expected));
4865 CHECK_MATCH ("ns :: foo < char * > ( int ) &&",
4866 symbol_name_match_type::FULL, true, EXPECT (expected));
4867 CHECK_MATCH ("foo < char * > ( int ) const",
4868 symbol_name_match_type::WILD, true, EXPECT (expected));
4869 CHECK_MATCH ("foo < char * > ( int ) &&",
4870 symbol_name_match_type::WILD, true, EXPECT (expected));
4873 /* Test lookup names that don't match anything. */
4875 CHECK_MATCH ("bar2", symbol_name_match_type::WILD, false,
4878 CHECK_MATCH ("doesntexist", symbol_name_match_type::FULL, false,
4882 /* Some wild matching tests, exercising "(anonymous namespace)",
4883 which should not be confused with a parameter list. */
4885 static const char *syms[] = {
4889 "A :: B :: C ( int )",
4894 for (const char *s : syms)
4896 CHECK_MATCH (s, symbol_name_match_type::WILD, false,
4897 EXPECT ("(anonymous namespace)::A::B::C"));
4902 static const char expected[] = "ns2::tmpl<int>::foo2";
4903 CHECK_MATCH ("tmp", symbol_name_match_type::WILD, true,
4905 CHECK_MATCH ("tmpl<", symbol_name_match_type::WILD, true,
4909 SELF_CHECK (!any_mismatch);
4918 test_mapped_index_find_name_component_bounds ();
4919 test_dw2_expand_symtabs_matching_symbol ();
4922 }} // namespace selftests::dw2_expand_symtabs_matching
4924 #endif /* GDB_SELF_TEST */
4926 /* Helper for dw2_expand_matching symtabs. Called on each symbol
4927 matched, to expand corresponding CUs that were marked. IDX is the
4928 index of the symbol name that matched. */
4931 dw2_expand_marked_cus
4932 (mapped_index &index, offset_type idx,
4933 struct objfile *objfile,
4934 gdb::function_view<expand_symtabs_file_matcher_ftype> file_matcher,
4935 gdb::function_view<expand_symtabs_exp_notify_ftype> expansion_notify,
4939 offset_type *vec, vec_len, vec_idx;
4940 bool global_seen = false;
4942 vec = (offset_type *) (index.constant_pool
4943 + MAYBE_SWAP (index.symbol_table[idx + 1]));
4944 vec_len = MAYBE_SWAP (vec[0]);
4945 for (vec_idx = 0; vec_idx < vec_len; ++vec_idx)
4947 struct dwarf2_per_cu_data *per_cu;
4948 offset_type cu_index_and_attrs = MAYBE_SWAP (vec[vec_idx + 1]);
4949 /* This value is only valid for index versions >= 7. */
4950 int is_static = GDB_INDEX_SYMBOL_STATIC_VALUE (cu_index_and_attrs);
4951 gdb_index_symbol_kind symbol_kind =
4952 GDB_INDEX_SYMBOL_KIND_VALUE (cu_index_and_attrs);
4953 int cu_index = GDB_INDEX_CU_VALUE (cu_index_and_attrs);
4954 /* Only check the symbol attributes if they're present.
4955 Indices prior to version 7 don't record them,
4956 and indices >= 7 may elide them for certain symbols
4957 (gold does this). */
4960 && symbol_kind != GDB_INDEX_SYMBOL_KIND_NONE);
4962 /* Work around gold/15646. */
4965 if (!is_static && global_seen)
4971 /* Only check the symbol's kind if it has one. */
4976 case VARIABLES_DOMAIN:
4977 if (symbol_kind != GDB_INDEX_SYMBOL_KIND_VARIABLE)
4980 case FUNCTIONS_DOMAIN:
4981 if (symbol_kind != GDB_INDEX_SYMBOL_KIND_FUNCTION)
4985 if (symbol_kind != GDB_INDEX_SYMBOL_KIND_TYPE)
4993 /* Don't crash on bad data. */
4994 if (cu_index >= (dwarf2_per_objfile->n_comp_units
4995 + dwarf2_per_objfile->n_type_units))
4997 complaint (&symfile_complaints,
4998 _(".gdb_index entry has bad CU index"
4999 " [in module %s]"), objfile_name (objfile));
5003 per_cu = dw2_get_cutu (cu_index);
5004 if (file_matcher == NULL || per_cu->v.quick->mark)
5006 int symtab_was_null =
5007 (per_cu->v.quick->compunit_symtab == NULL);
5009 dw2_instantiate_symtab (per_cu);
5011 if (expansion_notify != NULL
5013 && per_cu->v.quick->compunit_symtab != NULL)
5014 expansion_notify (per_cu->v.quick->compunit_symtab);
5020 dw2_expand_symtabs_matching
5021 (struct objfile *objfile,
5022 gdb::function_view<expand_symtabs_file_matcher_ftype> file_matcher,
5023 const lookup_name_info &lookup_name,
5024 gdb::function_view<expand_symtabs_symbol_matcher_ftype> symbol_matcher,
5025 gdb::function_view<expand_symtabs_exp_notify_ftype> expansion_notify,
5026 enum search_domain kind)
5031 dw2_setup (objfile);
5033 /* index_table is NULL if OBJF_READNOW. */
5034 if (!dwarf2_per_objfile->index_table)
5037 if (file_matcher != NULL)
5039 htab_up visited_found (htab_create_alloc (10, htab_hash_pointer,
5041 NULL, xcalloc, xfree));
5042 htab_up visited_not_found (htab_create_alloc (10, htab_hash_pointer,
5044 NULL, xcalloc, xfree));
5046 /* The rule is CUs specify all the files, including those used by
5047 any TU, so there's no need to scan TUs here. */
5049 for (i = 0; i < dwarf2_per_objfile->n_comp_units; ++i)
5052 struct dwarf2_per_cu_data *per_cu = dw2_get_cu (i);
5053 struct quick_file_names *file_data;
5058 per_cu->v.quick->mark = 0;
5060 /* We only need to look at symtabs not already expanded. */
5061 if (per_cu->v.quick->compunit_symtab)
5064 file_data = dw2_get_file_names (per_cu);
5065 if (file_data == NULL)
5068 if (htab_find (visited_not_found.get (), file_data) != NULL)
5070 else if (htab_find (visited_found.get (), file_data) != NULL)
5072 per_cu->v.quick->mark = 1;
5076 for (j = 0; j < file_data->num_file_names; ++j)
5078 const char *this_real_name;
5080 if (file_matcher (file_data->file_names[j], false))
5082 per_cu->v.quick->mark = 1;
5086 /* Before we invoke realpath, which can get expensive when many
5087 files are involved, do a quick comparison of the basenames. */
5088 if (!basenames_may_differ
5089 && !file_matcher (lbasename (file_data->file_names[j]),
5093 this_real_name = dw2_get_real_path (objfile, file_data, j);
5094 if (file_matcher (this_real_name, false))
5096 per_cu->v.quick->mark = 1;
5101 slot = htab_find_slot (per_cu->v.quick->mark
5102 ? visited_found.get ()
5103 : visited_not_found.get (),
5109 mapped_index &index = *dwarf2_per_objfile->index_table;
5111 dw2_expand_symtabs_matching_symbol (index, lookup_name,
5113 kind, [&] (offset_type idx)
5115 dw2_expand_marked_cus (index, idx, objfile, file_matcher,
5116 expansion_notify, kind);
5120 /* A helper for dw2_find_pc_sect_compunit_symtab which finds the most specific
5123 static struct compunit_symtab *
5124 recursively_find_pc_sect_compunit_symtab (struct compunit_symtab *cust,
5129 if (COMPUNIT_BLOCKVECTOR (cust) != NULL
5130 && blockvector_contains_pc (COMPUNIT_BLOCKVECTOR (cust), pc))
5133 if (cust->includes == NULL)
5136 for (i = 0; cust->includes[i]; ++i)
5138 struct compunit_symtab *s = cust->includes[i];
5140 s = recursively_find_pc_sect_compunit_symtab (s, pc);
5148 static struct compunit_symtab *
5149 dw2_find_pc_sect_compunit_symtab (struct objfile *objfile,
5150 struct bound_minimal_symbol msymbol,
5152 struct obj_section *section,
5155 struct dwarf2_per_cu_data *data;
5156 struct compunit_symtab *result;
5158 dw2_setup (objfile);
5160 if (!objfile->psymtabs_addrmap)
5163 data = (struct dwarf2_per_cu_data *) addrmap_find (objfile->psymtabs_addrmap,
5168 if (warn_if_readin && data->v.quick->compunit_symtab)
5169 warning (_("(Internal error: pc %s in read in CU, but not in symtab.)"),
5170 paddress (get_objfile_arch (objfile), pc));
5173 = recursively_find_pc_sect_compunit_symtab (dw2_instantiate_symtab (data),
5175 gdb_assert (result != NULL);
5180 dw2_map_symbol_filenames (struct objfile *objfile, symbol_filename_ftype *fun,
5181 void *data, int need_fullname)
5183 dw2_setup (objfile);
5185 if (!dwarf2_per_objfile->filenames_cache)
5187 dwarf2_per_objfile->filenames_cache.emplace ();
5189 htab_up visited (htab_create_alloc (10,
5190 htab_hash_pointer, htab_eq_pointer,
5191 NULL, xcalloc, xfree));
5193 /* The rule is CUs specify all the files, including those used
5194 by any TU, so there's no need to scan TUs here. We can
5195 ignore file names coming from already-expanded CUs. */
5197 for (int i = 0; i < dwarf2_per_objfile->n_comp_units; ++i)
5199 struct dwarf2_per_cu_data *per_cu = dw2_get_cutu (i);
5201 if (per_cu->v.quick->compunit_symtab)
5203 void **slot = htab_find_slot (visited.get (),
5204 per_cu->v.quick->file_names,
5207 *slot = per_cu->v.quick->file_names;
5211 for (int i = 0; i < dwarf2_per_objfile->n_comp_units; ++i)
5214 struct dwarf2_per_cu_data *per_cu = dw2_get_cu (i);
5215 struct quick_file_names *file_data;
5218 /* We only need to look at symtabs not already expanded. */
5219 if (per_cu->v.quick->compunit_symtab)
5222 file_data = dw2_get_file_names (per_cu);
5223 if (file_data == NULL)
5226 slot = htab_find_slot (visited.get (), file_data, INSERT);
5229 /* Already visited. */
5234 for (int j = 0; j < file_data->num_file_names; ++j)
5236 const char *filename = file_data->file_names[j];
5237 dwarf2_per_objfile->filenames_cache->seen (filename);
5242 dwarf2_per_objfile->filenames_cache->traverse ([&] (const char *filename)
5244 gdb::unique_xmalloc_ptr<char> this_real_name;
5247 this_real_name = gdb_realpath (filename);
5248 (*fun) (filename, this_real_name.get (), data);
5253 dw2_has_symbols (struct objfile *objfile)
5258 const struct quick_symbol_functions dwarf2_gdb_index_functions =
5261 dw2_find_last_source_symtab,
5262 dw2_forget_cached_source_info,
5263 dw2_map_symtabs_matching_filename,
5268 dw2_expand_symtabs_for_function,
5269 dw2_expand_all_symtabs,
5270 dw2_expand_symtabs_with_fullname,
5271 dw2_map_matching_symbols,
5272 dw2_expand_symtabs_matching,
5273 dw2_find_pc_sect_compunit_symtab,
5275 dw2_map_symbol_filenames
5278 /* Initialize for reading DWARF for this objfile. Return 0 if this
5279 file will use psymtabs, or 1 if using the GNU index. */
5282 dwarf2_initialize_objfile (struct objfile *objfile)
5284 /* If we're about to read full symbols, don't bother with the
5285 indices. In this case we also don't care if some other debug
5286 format is making psymtabs, because they are all about to be
5288 if ((objfile->flags & OBJF_READNOW))
5292 dwarf2_per_objfile->using_index = 1;
5293 create_all_comp_units (objfile);
5294 create_all_type_units (objfile);
5295 dwarf2_per_objfile->quick_file_names_table =
5296 create_quick_file_names_table (dwarf2_per_objfile->n_comp_units);
5298 for (i = 0; i < (dwarf2_per_objfile->n_comp_units
5299 + dwarf2_per_objfile->n_type_units); ++i)
5301 struct dwarf2_per_cu_data *per_cu = dw2_get_cutu (i);
5303 per_cu->v.quick = OBSTACK_ZALLOC (&objfile->objfile_obstack,
5304 struct dwarf2_per_cu_quick_data);
5307 /* Return 1 so that gdb sees the "quick" functions. However,
5308 these functions will be no-ops because we will have expanded
5313 if (dwarf2_read_index (objfile))
5321 /* Build a partial symbol table. */
5324 dwarf2_build_psymtabs (struct objfile *objfile)
5327 if (objfile->global_psymbols.capacity () == 0
5328 && objfile->static_psymbols.capacity () == 0)
5329 init_psymbol_list (objfile, 1024);
5333 /* This isn't really ideal: all the data we allocate on the
5334 objfile's obstack is still uselessly kept around. However,
5335 freeing it seems unsafe. */
5336 psymtab_discarder psymtabs (objfile);
5337 dwarf2_build_psymtabs_hard (objfile);
5340 CATCH (except, RETURN_MASK_ERROR)
5342 exception_print (gdb_stderr, except);
5347 /* Return the total length of the CU described by HEADER. */
5350 get_cu_length (const struct comp_unit_head *header)
5352 return header->initial_length_size + header->length;
5355 /* Return TRUE if SECT_OFF is within CU_HEADER. */
5358 offset_in_cu_p (const comp_unit_head *cu_header, sect_offset sect_off)
5360 sect_offset bottom = cu_header->sect_off;
5361 sect_offset top = cu_header->sect_off + get_cu_length (cu_header);
5363 return sect_off >= bottom && sect_off < top;
5366 /* Find the base address of the compilation unit for range lists and
5367 location lists. It will normally be specified by DW_AT_low_pc.
5368 In DWARF-3 draft 4, the base address could be overridden by
5369 DW_AT_entry_pc. It's been removed, but GCC still uses this for
5370 compilation units with discontinuous ranges. */
5373 dwarf2_find_base_address (struct die_info *die, struct dwarf2_cu *cu)
5375 struct attribute *attr;
5378 cu->base_address = 0;
5380 attr = dwarf2_attr (die, DW_AT_entry_pc, cu);
5383 cu->base_address = attr_value_as_address (attr);
5388 attr = dwarf2_attr (die, DW_AT_low_pc, cu);
5391 cu->base_address = attr_value_as_address (attr);
5397 /* Read in the comp unit header information from the debug_info at info_ptr.
5398 Use rcuh_kind::COMPILE as the default type if not known by the caller.
5399 NOTE: This leaves members offset, first_die_offset to be filled in
5402 static const gdb_byte *
5403 read_comp_unit_head (struct comp_unit_head *cu_header,
5404 const gdb_byte *info_ptr,
5405 struct dwarf2_section_info *section,
5406 rcuh_kind section_kind)
5409 unsigned int bytes_read;
5410 const char *filename = get_section_file_name (section);
5411 bfd *abfd = get_section_bfd_owner (section);
5413 cu_header->length = read_initial_length (abfd, info_ptr, &bytes_read);
5414 cu_header->initial_length_size = bytes_read;
5415 cu_header->offset_size = (bytes_read == 4) ? 4 : 8;
5416 info_ptr += bytes_read;
5417 cu_header->version = read_2_bytes (abfd, info_ptr);
5419 if (cu_header->version < 5)
5420 switch (section_kind)
5422 case rcuh_kind::COMPILE:
5423 cu_header->unit_type = DW_UT_compile;
5425 case rcuh_kind::TYPE:
5426 cu_header->unit_type = DW_UT_type;
5429 internal_error (__FILE__, __LINE__,
5430 _("read_comp_unit_head: invalid section_kind"));
5434 cu_header->unit_type = static_cast<enum dwarf_unit_type>
5435 (read_1_byte (abfd, info_ptr));
5437 switch (cu_header->unit_type)
5440 if (section_kind != rcuh_kind::COMPILE)
5441 error (_("Dwarf Error: wrong unit_type in compilation unit header "
5442 "(is DW_UT_compile, should be DW_UT_type) [in module %s]"),
5446 section_kind = rcuh_kind::TYPE;
5449 error (_("Dwarf Error: wrong unit_type in compilation unit header "
5450 "(is %d, should be %d or %d) [in module %s]"),
5451 cu_header->unit_type, DW_UT_compile, DW_UT_type, filename);
5454 cu_header->addr_size = read_1_byte (abfd, info_ptr);
5457 cu_header->abbrev_sect_off = (sect_offset) read_offset (abfd, info_ptr,
5460 info_ptr += bytes_read;
5461 if (cu_header->version < 5)
5463 cu_header->addr_size = read_1_byte (abfd, info_ptr);
5466 signed_addr = bfd_get_sign_extend_vma (abfd);
5467 if (signed_addr < 0)
5468 internal_error (__FILE__, __LINE__,
5469 _("read_comp_unit_head: dwarf from non elf file"));
5470 cu_header->signed_addr_p = signed_addr;
5472 if (section_kind == rcuh_kind::TYPE)
5474 LONGEST type_offset;
5476 cu_header->signature = read_8_bytes (abfd, info_ptr);
5479 type_offset = read_offset (abfd, info_ptr, cu_header, &bytes_read);
5480 info_ptr += bytes_read;
5481 cu_header->type_cu_offset_in_tu = (cu_offset) type_offset;
5482 if (to_underlying (cu_header->type_cu_offset_in_tu) != type_offset)
5483 error (_("Dwarf Error: Too big type_offset in compilation unit "
5484 "header (is %s) [in module %s]"), plongest (type_offset),
5491 /* Helper function that returns the proper abbrev section for
5494 static struct dwarf2_section_info *
5495 get_abbrev_section_for_cu (struct dwarf2_per_cu_data *this_cu)
5497 struct dwarf2_section_info *abbrev;
5499 if (this_cu->is_dwz)
5500 abbrev = &dwarf2_get_dwz_file ()->abbrev;
5502 abbrev = &dwarf2_per_objfile->abbrev;
5507 /* Subroutine of read_and_check_comp_unit_head and
5508 read_and_check_type_unit_head to simplify them.
5509 Perform various error checking on the header. */
5512 error_check_comp_unit_head (struct comp_unit_head *header,
5513 struct dwarf2_section_info *section,
5514 struct dwarf2_section_info *abbrev_section)
5516 const char *filename = get_section_file_name (section);
5518 if (header->version < 2 || header->version > 5)
5519 error (_("Dwarf Error: wrong version in compilation unit header "
5520 "(is %d, should be 2, 3, 4 or 5) [in module %s]"), header->version,
5523 if (to_underlying (header->abbrev_sect_off)
5524 >= dwarf2_section_size (dwarf2_per_objfile->objfile, abbrev_section))
5525 error (_("Dwarf Error: bad offset (0x%x) in compilation unit header "
5526 "(offset 0x%x + 6) [in module %s]"),
5527 to_underlying (header->abbrev_sect_off),
5528 to_underlying (header->sect_off),
5531 /* Cast to ULONGEST to use 64-bit arithmetic when possible to
5532 avoid potential 32-bit overflow. */
5533 if (((ULONGEST) header->sect_off + get_cu_length (header))
5535 error (_("Dwarf Error: bad length (0x%x) in compilation unit header "
5536 "(offset 0x%x + 0) [in module %s]"),
5537 header->length, to_underlying (header->sect_off),
5541 /* Read in a CU/TU header and perform some basic error checking.
5542 The contents of the header are stored in HEADER.
5543 The result is a pointer to the start of the first DIE. */
5545 static const gdb_byte *
5546 read_and_check_comp_unit_head (struct comp_unit_head *header,
5547 struct dwarf2_section_info *section,
5548 struct dwarf2_section_info *abbrev_section,
5549 const gdb_byte *info_ptr,
5550 rcuh_kind section_kind)
5552 const gdb_byte *beg_of_comp_unit = info_ptr;
5553 bfd *abfd = get_section_bfd_owner (section);
5555 header->sect_off = (sect_offset) (beg_of_comp_unit - section->buffer);
5557 info_ptr = read_comp_unit_head (header, info_ptr, section, section_kind);
5559 header->first_die_cu_offset = (cu_offset) (info_ptr - beg_of_comp_unit);
5561 error_check_comp_unit_head (header, section, abbrev_section);
5566 /* Fetch the abbreviation table offset from a comp or type unit header. */
5569 read_abbrev_offset (struct dwarf2_section_info *section,
5570 sect_offset sect_off)
5572 bfd *abfd = get_section_bfd_owner (section);
5573 const gdb_byte *info_ptr;
5574 unsigned int initial_length_size, offset_size;
5577 dwarf2_read_section (dwarf2_per_objfile->objfile, section);
5578 info_ptr = section->buffer + to_underlying (sect_off);
5579 read_initial_length (abfd, info_ptr, &initial_length_size);
5580 offset_size = initial_length_size == 4 ? 4 : 8;
5581 info_ptr += initial_length_size;
5583 version = read_2_bytes (abfd, info_ptr);
5587 /* Skip unit type and address size. */
5591 return (sect_offset) read_offset_1 (abfd, info_ptr, offset_size);
5594 /* Allocate a new partial symtab for file named NAME and mark this new
5595 partial symtab as being an include of PST. */
5598 dwarf2_create_include_psymtab (const char *name, struct partial_symtab *pst,
5599 struct objfile *objfile)
5601 struct partial_symtab *subpst = allocate_psymtab (name, objfile);
5603 if (!IS_ABSOLUTE_PATH (subpst->filename))
5605 /* It shares objfile->objfile_obstack. */
5606 subpst->dirname = pst->dirname;
5609 subpst->textlow = 0;
5610 subpst->texthigh = 0;
5612 subpst->dependencies
5613 = XOBNEW (&objfile->objfile_obstack, struct partial_symtab *);
5614 subpst->dependencies[0] = pst;
5615 subpst->number_of_dependencies = 1;
5617 subpst->globals_offset = 0;
5618 subpst->n_global_syms = 0;
5619 subpst->statics_offset = 0;
5620 subpst->n_static_syms = 0;
5621 subpst->compunit_symtab = NULL;
5622 subpst->read_symtab = pst->read_symtab;
5625 /* No private part is necessary for include psymtabs. This property
5626 can be used to differentiate between such include psymtabs and
5627 the regular ones. */
5628 subpst->read_symtab_private = NULL;
5631 /* Read the Line Number Program data and extract the list of files
5632 included by the source file represented by PST. Build an include
5633 partial symtab for each of these included files. */
5636 dwarf2_build_include_psymtabs (struct dwarf2_cu *cu,
5637 struct die_info *die,
5638 struct partial_symtab *pst)
5641 struct attribute *attr;
5643 attr = dwarf2_attr (die, DW_AT_stmt_list, cu);
5645 lh = dwarf_decode_line_header ((sect_offset) DW_UNSND (attr), cu);
5647 return; /* No linetable, so no includes. */
5649 /* NOTE: pst->dirname is DW_AT_comp_dir (if present). */
5650 dwarf_decode_lines (lh.get (), pst->dirname, cu, pst, pst->textlow, 1);
5654 hash_signatured_type (const void *item)
5656 const struct signatured_type *sig_type
5657 = (const struct signatured_type *) item;
5659 /* This drops the top 32 bits of the signature, but is ok for a hash. */
5660 return sig_type->signature;
5664 eq_signatured_type (const void *item_lhs, const void *item_rhs)
5666 const struct signatured_type *lhs = (const struct signatured_type *) item_lhs;
5667 const struct signatured_type *rhs = (const struct signatured_type *) item_rhs;
5669 return lhs->signature == rhs->signature;
5672 /* Allocate a hash table for signatured types. */
5675 allocate_signatured_type_table (struct objfile *objfile)
5677 return htab_create_alloc_ex (41,
5678 hash_signatured_type,
5681 &objfile->objfile_obstack,
5682 hashtab_obstack_allocate,
5683 dummy_obstack_deallocate);
5686 /* A helper function to add a signatured type CU to a table. */
5689 add_signatured_type_cu_to_table (void **slot, void *datum)
5691 struct signatured_type *sigt = (struct signatured_type *) *slot;
5692 struct signatured_type ***datap = (struct signatured_type ***) datum;
5700 /* A helper for create_debug_types_hash_table. Read types from SECTION
5701 and fill them into TYPES_HTAB. It will process only type units,
5702 therefore DW_UT_type. */
5705 create_debug_type_hash_table (struct dwo_file *dwo_file,
5706 dwarf2_section_info *section, htab_t &types_htab,
5707 rcuh_kind section_kind)
5709 struct objfile *objfile = dwarf2_per_objfile->objfile;
5710 struct dwarf2_section_info *abbrev_section;
5712 const gdb_byte *info_ptr, *end_ptr;
5714 abbrev_section = (dwo_file != NULL
5715 ? &dwo_file->sections.abbrev
5716 : &dwarf2_per_objfile->abbrev);
5718 if (dwarf_read_debug)
5719 fprintf_unfiltered (gdb_stdlog, "Reading %s for %s:\n",
5720 get_section_name (section),
5721 get_section_file_name (abbrev_section));
5723 dwarf2_read_section (objfile, section);
5724 info_ptr = section->buffer;
5726 if (info_ptr == NULL)
5729 /* We can't set abfd until now because the section may be empty or
5730 not present, in which case the bfd is unknown. */
5731 abfd = get_section_bfd_owner (section);
5733 /* We don't use init_cutu_and_read_dies_simple, or some such, here
5734 because we don't need to read any dies: the signature is in the
5737 end_ptr = info_ptr + section->size;
5738 while (info_ptr < end_ptr)
5740 struct signatured_type *sig_type;
5741 struct dwo_unit *dwo_tu;
5743 const gdb_byte *ptr = info_ptr;
5744 struct comp_unit_head header;
5745 unsigned int length;
5747 sect_offset sect_off = (sect_offset) (ptr - section->buffer);
5749 /* Initialize it due to a false compiler warning. */
5750 header.signature = -1;
5751 header.type_cu_offset_in_tu = (cu_offset) -1;
5753 /* We need to read the type's signature in order to build the hash
5754 table, but we don't need anything else just yet. */
5756 ptr = read_and_check_comp_unit_head (&header, section,
5757 abbrev_section, ptr, section_kind);
5759 length = get_cu_length (&header);
5761 /* Skip dummy type units. */
5762 if (ptr >= info_ptr + length
5763 || peek_abbrev_code (abfd, ptr) == 0
5764 || header.unit_type != DW_UT_type)
5770 if (types_htab == NULL)
5773 types_htab = allocate_dwo_unit_table (objfile);
5775 types_htab = allocate_signatured_type_table (objfile);
5781 dwo_tu = OBSTACK_ZALLOC (&objfile->objfile_obstack,
5783 dwo_tu->dwo_file = dwo_file;
5784 dwo_tu->signature = header.signature;
5785 dwo_tu->type_offset_in_tu = header.type_cu_offset_in_tu;
5786 dwo_tu->section = section;
5787 dwo_tu->sect_off = sect_off;
5788 dwo_tu->length = length;
5792 /* N.B.: type_offset is not usable if this type uses a DWO file.
5793 The real type_offset is in the DWO file. */
5795 sig_type = OBSTACK_ZALLOC (&objfile->objfile_obstack,
5796 struct signatured_type);
5797 sig_type->signature = header.signature;
5798 sig_type->type_offset_in_tu = header.type_cu_offset_in_tu;
5799 sig_type->per_cu.objfile = objfile;
5800 sig_type->per_cu.is_debug_types = 1;
5801 sig_type->per_cu.section = section;
5802 sig_type->per_cu.sect_off = sect_off;
5803 sig_type->per_cu.length = length;
5806 slot = htab_find_slot (types_htab,
5807 dwo_file ? (void*) dwo_tu : (void *) sig_type,
5809 gdb_assert (slot != NULL);
5812 sect_offset dup_sect_off;
5816 const struct dwo_unit *dup_tu
5817 = (const struct dwo_unit *) *slot;
5819 dup_sect_off = dup_tu->sect_off;
5823 const struct signatured_type *dup_tu
5824 = (const struct signatured_type *) *slot;
5826 dup_sect_off = dup_tu->per_cu.sect_off;
5829 complaint (&symfile_complaints,
5830 _("debug type entry at offset 0x%x is duplicate to"
5831 " the entry at offset 0x%x, signature %s"),
5832 to_underlying (sect_off), to_underlying (dup_sect_off),
5833 hex_string (header.signature));
5835 *slot = dwo_file ? (void *) dwo_tu : (void *) sig_type;
5837 if (dwarf_read_debug > 1)
5838 fprintf_unfiltered (gdb_stdlog, " offset 0x%x, signature %s\n",
5839 to_underlying (sect_off),
5840 hex_string (header.signature));
5846 /* Create the hash table of all entries in the .debug_types
5847 (or .debug_types.dwo) section(s).
5848 If reading a DWO file, then DWO_FILE is a pointer to the DWO file object,
5849 otherwise it is NULL.
5851 The result is a pointer to the hash table or NULL if there are no types.
5853 Note: This function processes DWO files only, not DWP files. */
5856 create_debug_types_hash_table (struct dwo_file *dwo_file,
5857 VEC (dwarf2_section_info_def) *types,
5861 struct dwarf2_section_info *section;
5863 if (VEC_empty (dwarf2_section_info_def, types))
5867 VEC_iterate (dwarf2_section_info_def, types, ix, section);
5869 create_debug_type_hash_table (dwo_file, section, types_htab,
5873 /* Create the hash table of all entries in the .debug_types section,
5874 and initialize all_type_units.
5875 The result is zero if there is an error (e.g. missing .debug_types section),
5876 otherwise non-zero. */
5879 create_all_type_units (struct objfile *objfile)
5881 htab_t types_htab = NULL;
5882 struct signatured_type **iter;
5884 create_debug_type_hash_table (NULL, &dwarf2_per_objfile->info, types_htab,
5885 rcuh_kind::COMPILE);
5886 create_debug_types_hash_table (NULL, dwarf2_per_objfile->types, types_htab);
5887 if (types_htab == NULL)
5889 dwarf2_per_objfile->signatured_types = NULL;
5893 dwarf2_per_objfile->signatured_types = types_htab;
5895 dwarf2_per_objfile->n_type_units
5896 = dwarf2_per_objfile->n_allocated_type_units
5897 = htab_elements (types_htab);
5898 dwarf2_per_objfile->all_type_units =
5899 XNEWVEC (struct signatured_type *, dwarf2_per_objfile->n_type_units);
5900 iter = &dwarf2_per_objfile->all_type_units[0];
5901 htab_traverse_noresize (types_htab, add_signatured_type_cu_to_table, &iter);
5902 gdb_assert (iter - &dwarf2_per_objfile->all_type_units[0]
5903 == dwarf2_per_objfile->n_type_units);
5908 /* Add an entry for signature SIG to dwarf2_per_objfile->signatured_types.
5909 If SLOT is non-NULL, it is the entry to use in the hash table.
5910 Otherwise we find one. */
5912 static struct signatured_type *
5913 add_type_unit (ULONGEST sig, void **slot)
5915 struct objfile *objfile = dwarf2_per_objfile->objfile;
5916 int n_type_units = dwarf2_per_objfile->n_type_units;
5917 struct signatured_type *sig_type;
5919 gdb_assert (n_type_units <= dwarf2_per_objfile->n_allocated_type_units);
5921 if (n_type_units > dwarf2_per_objfile->n_allocated_type_units)
5923 if (dwarf2_per_objfile->n_allocated_type_units == 0)
5924 dwarf2_per_objfile->n_allocated_type_units = 1;
5925 dwarf2_per_objfile->n_allocated_type_units *= 2;
5926 dwarf2_per_objfile->all_type_units
5927 = XRESIZEVEC (struct signatured_type *,
5928 dwarf2_per_objfile->all_type_units,
5929 dwarf2_per_objfile->n_allocated_type_units);
5930 ++dwarf2_per_objfile->tu_stats.nr_all_type_units_reallocs;
5932 dwarf2_per_objfile->n_type_units = n_type_units;
5934 sig_type = OBSTACK_ZALLOC (&objfile->objfile_obstack,
5935 struct signatured_type);
5936 dwarf2_per_objfile->all_type_units[n_type_units - 1] = sig_type;
5937 sig_type->signature = sig;
5938 sig_type->per_cu.is_debug_types = 1;
5939 if (dwarf2_per_objfile->using_index)
5941 sig_type->per_cu.v.quick =
5942 OBSTACK_ZALLOC (&objfile->objfile_obstack,
5943 struct dwarf2_per_cu_quick_data);
5948 slot = htab_find_slot (dwarf2_per_objfile->signatured_types,
5951 gdb_assert (*slot == NULL);
5953 /* The rest of sig_type must be filled in by the caller. */
5957 /* Subroutine of lookup_dwo_signatured_type and lookup_dwp_signatured_type.
5958 Fill in SIG_ENTRY with DWO_ENTRY. */
5961 fill_in_sig_entry_from_dwo_entry (struct objfile *objfile,
5962 struct signatured_type *sig_entry,
5963 struct dwo_unit *dwo_entry)
5965 /* Make sure we're not clobbering something we don't expect to. */
5966 gdb_assert (! sig_entry->per_cu.queued);
5967 gdb_assert (sig_entry->per_cu.cu == NULL);
5968 if (dwarf2_per_objfile->using_index)
5970 gdb_assert (sig_entry->per_cu.v.quick != NULL);
5971 gdb_assert (sig_entry->per_cu.v.quick->compunit_symtab == NULL);
5974 gdb_assert (sig_entry->per_cu.v.psymtab == NULL);
5975 gdb_assert (sig_entry->signature == dwo_entry->signature);
5976 gdb_assert (to_underlying (sig_entry->type_offset_in_section) == 0);
5977 gdb_assert (sig_entry->type_unit_group == NULL);
5978 gdb_assert (sig_entry->dwo_unit == NULL);
5980 sig_entry->per_cu.section = dwo_entry->section;
5981 sig_entry->per_cu.sect_off = dwo_entry->sect_off;
5982 sig_entry->per_cu.length = dwo_entry->length;
5983 sig_entry->per_cu.reading_dwo_directly = 1;
5984 sig_entry->per_cu.objfile = objfile;
5985 sig_entry->type_offset_in_tu = dwo_entry->type_offset_in_tu;
5986 sig_entry->dwo_unit = dwo_entry;
5989 /* Subroutine of lookup_signatured_type.
5990 If we haven't read the TU yet, create the signatured_type data structure
5991 for a TU to be read in directly from a DWO file, bypassing the stub.
5992 This is the "Stay in DWO Optimization": When there is no DWP file and we're
5993 using .gdb_index, then when reading a CU we want to stay in the DWO file
5994 containing that CU. Otherwise we could end up reading several other DWO
5995 files (due to comdat folding) to process the transitive closure of all the
5996 mentioned TUs, and that can be slow. The current DWO file will have every
5997 type signature that it needs.
5998 We only do this for .gdb_index because in the psymtab case we already have
5999 to read all the DWOs to build the type unit groups. */
6001 static struct signatured_type *
6002 lookup_dwo_signatured_type (struct dwarf2_cu *cu, ULONGEST sig)
6004 struct objfile *objfile = dwarf2_per_objfile->objfile;
6005 struct dwo_file *dwo_file;
6006 struct dwo_unit find_dwo_entry, *dwo_entry;
6007 struct signatured_type find_sig_entry, *sig_entry;
6010 gdb_assert (cu->dwo_unit && dwarf2_per_objfile->using_index);
6012 /* If TU skeletons have been removed then we may not have read in any
6014 if (dwarf2_per_objfile->signatured_types == NULL)
6016 dwarf2_per_objfile->signatured_types
6017 = allocate_signatured_type_table (objfile);
6020 /* We only ever need to read in one copy of a signatured type.
6021 Use the global signatured_types array to do our own comdat-folding
6022 of types. If this is the first time we're reading this TU, and
6023 the TU has an entry in .gdb_index, replace the recorded data from
6024 .gdb_index with this TU. */
6026 find_sig_entry.signature = sig;
6027 slot = htab_find_slot (dwarf2_per_objfile->signatured_types,
6028 &find_sig_entry, INSERT);
6029 sig_entry = (struct signatured_type *) *slot;
6031 /* We can get here with the TU already read, *or* in the process of being
6032 read. Don't reassign the global entry to point to this DWO if that's
6033 the case. Also note that if the TU is already being read, it may not
6034 have come from a DWO, the program may be a mix of Fission-compiled
6035 code and non-Fission-compiled code. */
6037 /* Have we already tried to read this TU?
6038 Note: sig_entry can be NULL if the skeleton TU was removed (thus it
6039 needn't exist in the global table yet). */
6040 if (sig_entry != NULL && sig_entry->per_cu.tu_read)
6043 /* Note: cu->dwo_unit is the dwo_unit that references this TU, not the
6044 dwo_unit of the TU itself. */
6045 dwo_file = cu->dwo_unit->dwo_file;
6047 /* Ok, this is the first time we're reading this TU. */
6048 if (dwo_file->tus == NULL)
6050 find_dwo_entry.signature = sig;
6051 dwo_entry = (struct dwo_unit *) htab_find (dwo_file->tus, &find_dwo_entry);
6052 if (dwo_entry == NULL)
6055 /* If the global table doesn't have an entry for this TU, add one. */
6056 if (sig_entry == NULL)
6057 sig_entry = add_type_unit (sig, slot);
6059 fill_in_sig_entry_from_dwo_entry (objfile, sig_entry, dwo_entry);
6060 sig_entry->per_cu.tu_read = 1;
6064 /* Subroutine of lookup_signatured_type.
6065 Look up the type for signature SIG, and if we can't find SIG in .gdb_index
6066 then try the DWP file. If the TU stub (skeleton) has been removed then
6067 it won't be in .gdb_index. */
6069 static struct signatured_type *
6070 lookup_dwp_signatured_type (struct dwarf2_cu *cu, ULONGEST sig)
6072 struct objfile *objfile = dwarf2_per_objfile->objfile;
6073 struct dwp_file *dwp_file = get_dwp_file ();
6074 struct dwo_unit *dwo_entry;
6075 struct signatured_type find_sig_entry, *sig_entry;
6078 gdb_assert (cu->dwo_unit && dwarf2_per_objfile->using_index);
6079 gdb_assert (dwp_file != NULL);
6081 /* If TU skeletons have been removed then we may not have read in any
6083 if (dwarf2_per_objfile->signatured_types == NULL)
6085 dwarf2_per_objfile->signatured_types
6086 = allocate_signatured_type_table (objfile);
6089 find_sig_entry.signature = sig;
6090 slot = htab_find_slot (dwarf2_per_objfile->signatured_types,
6091 &find_sig_entry, INSERT);
6092 sig_entry = (struct signatured_type *) *slot;
6094 /* Have we already tried to read this TU?
6095 Note: sig_entry can be NULL if the skeleton TU was removed (thus it
6096 needn't exist in the global table yet). */
6097 if (sig_entry != NULL)
6100 if (dwp_file->tus == NULL)
6102 dwo_entry = lookup_dwo_unit_in_dwp (dwp_file, NULL,
6103 sig, 1 /* is_debug_types */);
6104 if (dwo_entry == NULL)
6107 sig_entry = add_type_unit (sig, slot);
6108 fill_in_sig_entry_from_dwo_entry (objfile, sig_entry, dwo_entry);
6113 /* Lookup a signature based type for DW_FORM_ref_sig8.
6114 Returns NULL if signature SIG is not present in the table.
6115 It is up to the caller to complain about this. */
6117 static struct signatured_type *
6118 lookup_signatured_type (struct dwarf2_cu *cu, ULONGEST sig)
6121 && dwarf2_per_objfile->using_index)
6123 /* We're in a DWO/DWP file, and we're using .gdb_index.
6124 These cases require special processing. */
6125 if (get_dwp_file () == NULL)
6126 return lookup_dwo_signatured_type (cu, sig);
6128 return lookup_dwp_signatured_type (cu, sig);
6132 struct signatured_type find_entry, *entry;
6134 if (dwarf2_per_objfile->signatured_types == NULL)
6136 find_entry.signature = sig;
6137 entry = ((struct signatured_type *)
6138 htab_find (dwarf2_per_objfile->signatured_types, &find_entry));
6143 /* Low level DIE reading support. */
6145 /* Initialize a die_reader_specs struct from a dwarf2_cu struct. */
6148 init_cu_die_reader (struct die_reader_specs *reader,
6149 struct dwarf2_cu *cu,
6150 struct dwarf2_section_info *section,
6151 struct dwo_file *dwo_file)
6153 gdb_assert (section->readin && section->buffer != NULL);
6154 reader->abfd = get_section_bfd_owner (section);
6156 reader->dwo_file = dwo_file;
6157 reader->die_section = section;
6158 reader->buffer = section->buffer;
6159 reader->buffer_end = section->buffer + section->size;
6160 reader->comp_dir = NULL;
6163 /* Subroutine of init_cutu_and_read_dies to simplify it.
6164 Read in the rest of a CU/TU top level DIE from DWO_UNIT.
6165 There's just a lot of work to do, and init_cutu_and_read_dies is big enough
6168 STUB_COMP_UNIT_DIE is for the stub DIE, we copy over certain attributes
6169 from it to the DIE in the DWO. If NULL we are skipping the stub.
6170 STUB_COMP_DIR is similar to STUB_COMP_UNIT_DIE: When reading a TU directly
6171 from the DWO file, bypassing the stub, it contains the DW_AT_comp_dir
6172 attribute of the referencing CU. At most one of STUB_COMP_UNIT_DIE and
6173 STUB_COMP_DIR may be non-NULL.
6174 *RESULT_READER,*RESULT_INFO_PTR,*RESULT_COMP_UNIT_DIE,*RESULT_HAS_CHILDREN
6175 are filled in with the info of the DIE from the DWO file.
6176 ABBREV_TABLE_PROVIDED is non-zero if the caller of init_cutu_and_read_dies
6177 provided an abbrev table to use.
6178 The result is non-zero if a valid (non-dummy) DIE was found. */
6181 read_cutu_die_from_dwo (struct dwarf2_per_cu_data *this_cu,
6182 struct dwo_unit *dwo_unit,
6183 int abbrev_table_provided,
6184 struct die_info *stub_comp_unit_die,
6185 const char *stub_comp_dir,
6186 struct die_reader_specs *result_reader,
6187 const gdb_byte **result_info_ptr,
6188 struct die_info **result_comp_unit_die,
6189 int *result_has_children)
6191 struct objfile *objfile = dwarf2_per_objfile->objfile;
6192 struct dwarf2_cu *cu = this_cu->cu;
6193 struct dwarf2_section_info *section;
6195 const gdb_byte *begin_info_ptr, *info_ptr;
6196 ULONGEST signature; /* Or dwo_id. */
6197 struct attribute *comp_dir, *stmt_list, *low_pc, *high_pc, *ranges;
6198 int i,num_extra_attrs;
6199 struct dwarf2_section_info *dwo_abbrev_section;
6200 struct attribute *attr;
6201 struct die_info *comp_unit_die;
6203 /* At most one of these may be provided. */
6204 gdb_assert ((stub_comp_unit_die != NULL) + (stub_comp_dir != NULL) <= 1);
6206 /* These attributes aren't processed until later:
6207 DW_AT_stmt_list, DW_AT_low_pc, DW_AT_high_pc, DW_AT_ranges.
6208 DW_AT_comp_dir is used now, to find the DWO file, but it is also
6209 referenced later. However, these attributes are found in the stub
6210 which we won't have later. In order to not impose this complication
6211 on the rest of the code, we read them here and copy them to the
6220 if (stub_comp_unit_die != NULL)
6222 /* For TUs in DWO files, the DW_AT_stmt_list attribute lives in the
6224 if (! this_cu->is_debug_types)
6225 stmt_list = dwarf2_attr (stub_comp_unit_die, DW_AT_stmt_list, cu);
6226 low_pc = dwarf2_attr (stub_comp_unit_die, DW_AT_low_pc, cu);
6227 high_pc = dwarf2_attr (stub_comp_unit_die, DW_AT_high_pc, cu);
6228 ranges = dwarf2_attr (stub_comp_unit_die, DW_AT_ranges, cu);
6229 comp_dir = dwarf2_attr (stub_comp_unit_die, DW_AT_comp_dir, cu);
6231 /* There should be a DW_AT_addr_base attribute here (if needed).
6232 We need the value before we can process DW_FORM_GNU_addr_index. */
6234 attr = dwarf2_attr (stub_comp_unit_die, DW_AT_GNU_addr_base, cu);
6236 cu->addr_base = DW_UNSND (attr);
6238 /* There should be a DW_AT_ranges_base attribute here (if needed).
6239 We need the value before we can process DW_AT_ranges. */
6240 cu->ranges_base = 0;
6241 attr = dwarf2_attr (stub_comp_unit_die, DW_AT_GNU_ranges_base, cu);
6243 cu->ranges_base = DW_UNSND (attr);
6245 else if (stub_comp_dir != NULL)
6247 /* Reconstruct the comp_dir attribute to simplify the code below. */
6248 comp_dir = XOBNEW (&cu->comp_unit_obstack, struct attribute);
6249 comp_dir->name = DW_AT_comp_dir;
6250 comp_dir->form = DW_FORM_string;
6251 DW_STRING_IS_CANONICAL (comp_dir) = 0;
6252 DW_STRING (comp_dir) = stub_comp_dir;
6255 /* Set up for reading the DWO CU/TU. */
6256 cu->dwo_unit = dwo_unit;
6257 section = dwo_unit->section;
6258 dwarf2_read_section (objfile, section);
6259 abfd = get_section_bfd_owner (section);
6260 begin_info_ptr = info_ptr = (section->buffer
6261 + to_underlying (dwo_unit->sect_off));
6262 dwo_abbrev_section = &dwo_unit->dwo_file->sections.abbrev;
6263 init_cu_die_reader (result_reader, cu, section, dwo_unit->dwo_file);
6265 if (this_cu->is_debug_types)
6267 struct signatured_type *sig_type = (struct signatured_type *) this_cu;
6269 info_ptr = read_and_check_comp_unit_head (&cu->header, section,
6271 info_ptr, rcuh_kind::TYPE);
6272 /* This is not an assert because it can be caused by bad debug info. */
6273 if (sig_type->signature != cu->header.signature)
6275 error (_("Dwarf Error: signature mismatch %s vs %s while reading"
6276 " TU at offset 0x%x [in module %s]"),
6277 hex_string (sig_type->signature),
6278 hex_string (cu->header.signature),
6279 to_underlying (dwo_unit->sect_off),
6280 bfd_get_filename (abfd));
6282 gdb_assert (dwo_unit->sect_off == cu->header.sect_off);
6283 /* For DWOs coming from DWP files, we don't know the CU length
6284 nor the type's offset in the TU until now. */
6285 dwo_unit->length = get_cu_length (&cu->header);
6286 dwo_unit->type_offset_in_tu = cu->header.type_cu_offset_in_tu;
6288 /* Establish the type offset that can be used to lookup the type.
6289 For DWO files, we don't know it until now. */
6290 sig_type->type_offset_in_section
6291 = dwo_unit->sect_off + to_underlying (dwo_unit->type_offset_in_tu);
6295 info_ptr = read_and_check_comp_unit_head (&cu->header, section,
6297 info_ptr, rcuh_kind::COMPILE);
6298 gdb_assert (dwo_unit->sect_off == cu->header.sect_off);
6299 /* For DWOs coming from DWP files, we don't know the CU length
6301 dwo_unit->length = get_cu_length (&cu->header);
6304 /* Replace the CU's original abbrev table with the DWO's.
6305 Reminder: We can't read the abbrev table until we've read the header. */
6306 if (abbrev_table_provided)
6308 /* Don't free the provided abbrev table, the caller of
6309 init_cutu_and_read_dies owns it. */
6310 dwarf2_read_abbrevs (cu, dwo_abbrev_section);
6311 /* Ensure the DWO abbrev table gets freed. */
6312 make_cleanup (dwarf2_free_abbrev_table, cu);
6316 dwarf2_free_abbrev_table (cu);
6317 dwarf2_read_abbrevs (cu, dwo_abbrev_section);
6318 /* Leave any existing abbrev table cleanup as is. */
6321 /* Read in the die, but leave space to copy over the attributes
6322 from the stub. This has the benefit of simplifying the rest of
6323 the code - all the work to maintain the illusion of a single
6324 DW_TAG_{compile,type}_unit DIE is done here. */
6325 num_extra_attrs = ((stmt_list != NULL)
6329 + (comp_dir != NULL));
6330 info_ptr = read_full_die_1 (result_reader, result_comp_unit_die, info_ptr,
6331 result_has_children, num_extra_attrs);
6333 /* Copy over the attributes from the stub to the DIE we just read in. */
6334 comp_unit_die = *result_comp_unit_die;
6335 i = comp_unit_die->num_attrs;
6336 if (stmt_list != NULL)
6337 comp_unit_die->attrs[i++] = *stmt_list;
6339 comp_unit_die->attrs[i++] = *low_pc;
6340 if (high_pc != NULL)
6341 comp_unit_die->attrs[i++] = *high_pc;
6343 comp_unit_die->attrs[i++] = *ranges;
6344 if (comp_dir != NULL)
6345 comp_unit_die->attrs[i++] = *comp_dir;
6346 comp_unit_die->num_attrs += num_extra_attrs;
6348 if (dwarf_die_debug)
6350 fprintf_unfiltered (gdb_stdlog,
6351 "Read die from %s@0x%x of %s:\n",
6352 get_section_name (section),
6353 (unsigned) (begin_info_ptr - section->buffer),
6354 bfd_get_filename (abfd));
6355 dump_die (comp_unit_die, dwarf_die_debug);
6358 /* Save the comp_dir attribute. If there is no DWP file then we'll read
6359 TUs by skipping the stub and going directly to the entry in the DWO file.
6360 However, skipping the stub means we won't get DW_AT_comp_dir, so we have
6361 to get it via circuitous means. Blech. */
6362 if (comp_dir != NULL)
6363 result_reader->comp_dir = DW_STRING (comp_dir);
6365 /* Skip dummy compilation units. */
6366 if (info_ptr >= begin_info_ptr + dwo_unit->length
6367 || peek_abbrev_code (abfd, info_ptr) == 0)
6370 *result_info_ptr = info_ptr;
6374 /* Subroutine of init_cutu_and_read_dies to simplify it.
6375 Look up the DWO unit specified by COMP_UNIT_DIE of THIS_CU.
6376 Returns NULL if the specified DWO unit cannot be found. */
6378 static struct dwo_unit *
6379 lookup_dwo_unit (struct dwarf2_per_cu_data *this_cu,
6380 struct die_info *comp_unit_die)
6382 struct dwarf2_cu *cu = this_cu->cu;
6383 struct attribute *attr;
6385 struct dwo_unit *dwo_unit;
6386 const char *comp_dir, *dwo_name;
6388 gdb_assert (cu != NULL);
6390 /* Yeah, we look dwo_name up again, but it simplifies the code. */
6391 dwo_name = dwarf2_string_attr (comp_unit_die, DW_AT_GNU_dwo_name, cu);
6392 comp_dir = dwarf2_string_attr (comp_unit_die, DW_AT_comp_dir, cu);
6394 if (this_cu->is_debug_types)
6396 struct signatured_type *sig_type;
6398 /* Since this_cu is the first member of struct signatured_type,
6399 we can go from a pointer to one to a pointer to the other. */
6400 sig_type = (struct signatured_type *) this_cu;
6401 signature = sig_type->signature;
6402 dwo_unit = lookup_dwo_type_unit (sig_type, dwo_name, comp_dir);
6406 struct attribute *attr;
6408 attr = dwarf2_attr (comp_unit_die, DW_AT_GNU_dwo_id, cu);
6410 error (_("Dwarf Error: missing dwo_id for dwo_name %s"
6412 dwo_name, objfile_name (this_cu->objfile));
6413 signature = DW_UNSND (attr);
6414 dwo_unit = lookup_dwo_comp_unit (this_cu, dwo_name, comp_dir,
6421 /* Subroutine of init_cutu_and_read_dies to simplify it.
6422 See it for a description of the parameters.
6423 Read a TU directly from a DWO file, bypassing the stub.
6425 Note: This function could be a little bit simpler if we shared cleanups
6426 with our caller, init_cutu_and_read_dies. That's generally a fragile thing
6427 to do, so we keep this function self-contained. Or we could move this
6428 into our caller, but it's complex enough already. */
6431 init_tu_and_read_dwo_dies (struct dwarf2_per_cu_data *this_cu,
6432 int use_existing_cu, int keep,
6433 die_reader_func_ftype *die_reader_func,
6436 struct dwarf2_cu *cu;
6437 struct signatured_type *sig_type;
6438 struct cleanup *cleanups, *free_cu_cleanup = NULL;
6439 struct die_reader_specs reader;
6440 const gdb_byte *info_ptr;
6441 struct die_info *comp_unit_die;
6444 /* Verify we can do the following downcast, and that we have the
6446 gdb_assert (this_cu->is_debug_types && this_cu->reading_dwo_directly);
6447 sig_type = (struct signatured_type *) this_cu;
6448 gdb_assert (sig_type->dwo_unit != NULL);
6450 cleanups = make_cleanup (null_cleanup, NULL);
6452 if (use_existing_cu && this_cu->cu != NULL)
6454 gdb_assert (this_cu->cu->dwo_unit == sig_type->dwo_unit);
6456 /* There's no need to do the rereading_dwo_cu handling that
6457 init_cutu_and_read_dies does since we don't read the stub. */
6461 /* If !use_existing_cu, this_cu->cu must be NULL. */
6462 gdb_assert (this_cu->cu == NULL);
6463 cu = XNEW (struct dwarf2_cu);
6464 init_one_comp_unit (cu, this_cu);
6465 /* If an error occurs while loading, release our storage. */
6466 free_cu_cleanup = make_cleanup (free_heap_comp_unit, cu);
6469 /* A future optimization, if needed, would be to use an existing
6470 abbrev table. When reading DWOs with skeletonless TUs, all the TUs
6471 could share abbrev tables. */
6473 if (read_cutu_die_from_dwo (this_cu, sig_type->dwo_unit,
6474 0 /* abbrev_table_provided */,
6475 NULL /* stub_comp_unit_die */,
6476 sig_type->dwo_unit->dwo_file->comp_dir,
6478 &comp_unit_die, &has_children) == 0)
6481 do_cleanups (cleanups);
6485 /* All the "real" work is done here. */
6486 die_reader_func (&reader, info_ptr, comp_unit_die, has_children, data);
6488 /* This duplicates the code in init_cutu_and_read_dies,
6489 but the alternative is making the latter more complex.
6490 This function is only for the special case of using DWO files directly:
6491 no point in overly complicating the general case just to handle this. */
6492 if (free_cu_cleanup != NULL)
6496 /* We've successfully allocated this compilation unit. Let our
6497 caller clean it up when finished with it. */
6498 discard_cleanups (free_cu_cleanup);
6500 /* We can only discard free_cu_cleanup and all subsequent cleanups.
6501 So we have to manually free the abbrev table. */
6502 dwarf2_free_abbrev_table (cu);
6504 /* Link this CU into read_in_chain. */
6505 this_cu->cu->read_in_chain = dwarf2_per_objfile->read_in_chain;
6506 dwarf2_per_objfile->read_in_chain = this_cu;
6509 do_cleanups (free_cu_cleanup);
6512 do_cleanups (cleanups);
6515 /* Initialize a CU (or TU) and read its DIEs.
6516 If the CU defers to a DWO file, read the DWO file as well.
6518 ABBREV_TABLE, if non-NULL, is the abbreviation table to use.
6519 Otherwise the table specified in the comp unit header is read in and used.
6520 This is an optimization for when we already have the abbrev table.
6522 If USE_EXISTING_CU is non-zero, and THIS_CU->cu is non-NULL, then use it.
6523 Otherwise, a new CU is allocated with xmalloc.
6525 If KEEP is non-zero, then if we allocated a dwarf2_cu we add it to
6526 read_in_chain. Otherwise the dwarf2_cu data is freed at the end.
6528 WARNING: If THIS_CU is a "dummy CU" (used as filler by the incremental
6529 linker) then DIE_READER_FUNC will not get called. */
6532 init_cutu_and_read_dies (struct dwarf2_per_cu_data *this_cu,
6533 struct abbrev_table *abbrev_table,
6534 int use_existing_cu, int keep,
6535 die_reader_func_ftype *die_reader_func,
6538 struct objfile *objfile = dwarf2_per_objfile->objfile;
6539 struct dwarf2_section_info *section = this_cu->section;
6540 bfd *abfd = get_section_bfd_owner (section);
6541 struct dwarf2_cu *cu;
6542 const gdb_byte *begin_info_ptr, *info_ptr;
6543 struct die_reader_specs reader;
6544 struct die_info *comp_unit_die;
6546 struct attribute *attr;
6547 struct cleanup *cleanups, *free_cu_cleanup = NULL;
6548 struct signatured_type *sig_type = NULL;
6549 struct dwarf2_section_info *abbrev_section;
6550 /* Non-zero if CU currently points to a DWO file and we need to
6551 reread it. When this happens we need to reread the skeleton die
6552 before we can reread the DWO file (this only applies to CUs, not TUs). */
6553 int rereading_dwo_cu = 0;
6555 if (dwarf_die_debug)
6556 fprintf_unfiltered (gdb_stdlog, "Reading %s unit at offset 0x%x\n",
6557 this_cu->is_debug_types ? "type" : "comp",
6558 to_underlying (this_cu->sect_off));
6560 if (use_existing_cu)
6563 /* If we're reading a TU directly from a DWO file, including a virtual DWO
6564 file (instead of going through the stub), short-circuit all of this. */
6565 if (this_cu->reading_dwo_directly)
6567 /* Narrow down the scope of possibilities to have to understand. */
6568 gdb_assert (this_cu->is_debug_types);
6569 gdb_assert (abbrev_table == NULL);
6570 init_tu_and_read_dwo_dies (this_cu, use_existing_cu, keep,
6571 die_reader_func, data);
6575 cleanups = make_cleanup (null_cleanup, NULL);
6577 /* This is cheap if the section is already read in. */
6578 dwarf2_read_section (objfile, section);
6580 begin_info_ptr = info_ptr = section->buffer + to_underlying (this_cu->sect_off);
6582 abbrev_section = get_abbrev_section_for_cu (this_cu);
6584 if (use_existing_cu && this_cu->cu != NULL)
6587 /* If this CU is from a DWO file we need to start over, we need to
6588 refetch the attributes from the skeleton CU.
6589 This could be optimized by retrieving those attributes from when we
6590 were here the first time: the previous comp_unit_die was stored in
6591 comp_unit_obstack. But there's no data yet that we need this
6593 if (cu->dwo_unit != NULL)
6594 rereading_dwo_cu = 1;
6598 /* If !use_existing_cu, this_cu->cu must be NULL. */
6599 gdb_assert (this_cu->cu == NULL);
6600 cu = XNEW (struct dwarf2_cu);
6601 init_one_comp_unit (cu, this_cu);
6602 /* If an error occurs while loading, release our storage. */
6603 free_cu_cleanup = make_cleanup (free_heap_comp_unit, cu);
6606 /* Get the header. */
6607 if (to_underlying (cu->header.first_die_cu_offset) != 0 && !rereading_dwo_cu)
6609 /* We already have the header, there's no need to read it in again. */
6610 info_ptr += to_underlying (cu->header.first_die_cu_offset);
6614 if (this_cu->is_debug_types)
6616 info_ptr = read_and_check_comp_unit_head (&cu->header, section,
6617 abbrev_section, info_ptr,
6620 /* Since per_cu is the first member of struct signatured_type,
6621 we can go from a pointer to one to a pointer to the other. */
6622 sig_type = (struct signatured_type *) this_cu;
6623 gdb_assert (sig_type->signature == cu->header.signature);
6624 gdb_assert (sig_type->type_offset_in_tu
6625 == cu->header.type_cu_offset_in_tu);
6626 gdb_assert (this_cu->sect_off == cu->header.sect_off);
6628 /* LENGTH has not been set yet for type units if we're
6629 using .gdb_index. */
6630 this_cu->length = get_cu_length (&cu->header);
6632 /* Establish the type offset that can be used to lookup the type. */
6633 sig_type->type_offset_in_section =
6634 this_cu->sect_off + to_underlying (sig_type->type_offset_in_tu);
6636 this_cu->dwarf_version = cu->header.version;
6640 info_ptr = read_and_check_comp_unit_head (&cu->header, section,
6643 rcuh_kind::COMPILE);
6645 gdb_assert (this_cu->sect_off == cu->header.sect_off);
6646 gdb_assert (this_cu->length == get_cu_length (&cu->header));
6647 this_cu->dwarf_version = cu->header.version;
6651 /* Skip dummy compilation units. */
6652 if (info_ptr >= begin_info_ptr + this_cu->length
6653 || peek_abbrev_code (abfd, info_ptr) == 0)
6655 do_cleanups (cleanups);
6659 /* If we don't have them yet, read the abbrevs for this compilation unit.
6660 And if we need to read them now, make sure they're freed when we're
6661 done. Note that it's important that if the CU had an abbrev table
6662 on entry we don't free it when we're done: Somewhere up the call stack
6663 it may be in use. */
6664 if (abbrev_table != NULL)
6666 gdb_assert (cu->abbrev_table == NULL);
6667 gdb_assert (cu->header.abbrev_sect_off == abbrev_table->sect_off);
6668 cu->abbrev_table = abbrev_table;
6670 else if (cu->abbrev_table == NULL)
6672 dwarf2_read_abbrevs (cu, abbrev_section);
6673 make_cleanup (dwarf2_free_abbrev_table, cu);
6675 else if (rereading_dwo_cu)
6677 dwarf2_free_abbrev_table (cu);
6678 dwarf2_read_abbrevs (cu, abbrev_section);
6681 /* Read the top level CU/TU die. */
6682 init_cu_die_reader (&reader, cu, section, NULL);
6683 info_ptr = read_full_die (&reader, &comp_unit_die, info_ptr, &has_children);
6685 /* If we are in a DWO stub, process it and then read in the "real" CU/TU
6687 Note that if USE_EXISTING_OK != 0, and THIS_CU->cu already contains a
6688 DWO CU, that this test will fail (the attribute will not be present). */
6689 attr = dwarf2_attr (comp_unit_die, DW_AT_GNU_dwo_name, cu);
6692 struct dwo_unit *dwo_unit;
6693 struct die_info *dwo_comp_unit_die;
6697 complaint (&symfile_complaints,
6698 _("compilation unit with DW_AT_GNU_dwo_name"
6699 " has children (offset 0x%x) [in module %s]"),
6700 to_underlying (this_cu->sect_off), bfd_get_filename (abfd));
6702 dwo_unit = lookup_dwo_unit (this_cu, comp_unit_die);
6703 if (dwo_unit != NULL)
6705 if (read_cutu_die_from_dwo (this_cu, dwo_unit,
6706 abbrev_table != NULL,
6707 comp_unit_die, NULL,
6709 &dwo_comp_unit_die, &has_children) == 0)
6712 do_cleanups (cleanups);
6715 comp_unit_die = dwo_comp_unit_die;
6719 /* Yikes, we couldn't find the rest of the DIE, we only have
6720 the stub. A complaint has already been logged. There's
6721 not much more we can do except pass on the stub DIE to
6722 die_reader_func. We don't want to throw an error on bad
6727 /* All of the above is setup for this call. Yikes. */
6728 die_reader_func (&reader, info_ptr, comp_unit_die, has_children, data);
6730 /* Done, clean up. */
6731 if (free_cu_cleanup != NULL)
6735 /* We've successfully allocated this compilation unit. Let our
6736 caller clean it up when finished with it. */
6737 discard_cleanups (free_cu_cleanup);
6739 /* We can only discard free_cu_cleanup and all subsequent cleanups.
6740 So we have to manually free the abbrev table. */
6741 dwarf2_free_abbrev_table (cu);
6743 /* Link this CU into read_in_chain. */
6744 this_cu->cu->read_in_chain = dwarf2_per_objfile->read_in_chain;
6745 dwarf2_per_objfile->read_in_chain = this_cu;
6748 do_cleanups (free_cu_cleanup);
6751 do_cleanups (cleanups);
6754 /* Read CU/TU THIS_CU but do not follow DW_AT_GNU_dwo_name if present.
6755 DWO_FILE, if non-NULL, is the DWO file to read (the caller is assumed
6756 to have already done the lookup to find the DWO file).
6758 The caller is required to fill in THIS_CU->section, THIS_CU->offset, and
6759 THIS_CU->is_debug_types, but nothing else.
6761 We fill in THIS_CU->length.
6763 WARNING: If THIS_CU is a "dummy CU" (used as filler by the incremental
6764 linker) then DIE_READER_FUNC will not get called.
6766 THIS_CU->cu is always freed when done.
6767 This is done in order to not leave THIS_CU->cu in a state where we have
6768 to care whether it refers to the "main" CU or the DWO CU. */
6771 init_cutu_and_read_dies_no_follow (struct dwarf2_per_cu_data *this_cu,
6772 struct dwo_file *dwo_file,
6773 die_reader_func_ftype *die_reader_func,
6776 struct objfile *objfile = dwarf2_per_objfile->objfile;
6777 struct dwarf2_section_info *section = this_cu->section;
6778 bfd *abfd = get_section_bfd_owner (section);
6779 struct dwarf2_section_info *abbrev_section;
6780 struct dwarf2_cu cu;
6781 const gdb_byte *begin_info_ptr, *info_ptr;
6782 struct die_reader_specs reader;
6783 struct cleanup *cleanups;
6784 struct die_info *comp_unit_die;
6787 if (dwarf_die_debug)
6788 fprintf_unfiltered (gdb_stdlog, "Reading %s unit at offset 0x%x\n",
6789 this_cu->is_debug_types ? "type" : "comp",
6790 to_underlying (this_cu->sect_off));
6792 gdb_assert (this_cu->cu == NULL);
6794 abbrev_section = (dwo_file != NULL
6795 ? &dwo_file->sections.abbrev
6796 : get_abbrev_section_for_cu (this_cu));
6798 /* This is cheap if the section is already read in. */
6799 dwarf2_read_section (objfile, section);
6801 init_one_comp_unit (&cu, this_cu);
6803 cleanups = make_cleanup (free_stack_comp_unit, &cu);
6805 begin_info_ptr = info_ptr = section->buffer + to_underlying (this_cu->sect_off);
6806 info_ptr = read_and_check_comp_unit_head (&cu.header, section,
6807 abbrev_section, info_ptr,
6808 (this_cu->is_debug_types
6810 : rcuh_kind::COMPILE));
6812 this_cu->length = get_cu_length (&cu.header);
6814 /* Skip dummy compilation units. */
6815 if (info_ptr >= begin_info_ptr + this_cu->length
6816 || peek_abbrev_code (abfd, info_ptr) == 0)
6818 do_cleanups (cleanups);
6822 dwarf2_read_abbrevs (&cu, abbrev_section);
6823 make_cleanup (dwarf2_free_abbrev_table, &cu);
6825 init_cu_die_reader (&reader, &cu, section, dwo_file);
6826 info_ptr = read_full_die (&reader, &comp_unit_die, info_ptr, &has_children);
6828 die_reader_func (&reader, info_ptr, comp_unit_die, has_children, data);
6830 do_cleanups (cleanups);
6833 /* Read a CU/TU, except that this does not look for DW_AT_GNU_dwo_name and
6834 does not lookup the specified DWO file.
6835 This cannot be used to read DWO files.
6837 THIS_CU->cu is always freed when done.
6838 This is done in order to not leave THIS_CU->cu in a state where we have
6839 to care whether it refers to the "main" CU or the DWO CU.
6840 We can revisit this if the data shows there's a performance issue. */
6843 init_cutu_and_read_dies_simple (struct dwarf2_per_cu_data *this_cu,
6844 die_reader_func_ftype *die_reader_func,
6847 init_cutu_and_read_dies_no_follow (this_cu, NULL, die_reader_func, data);
6850 /* Type Unit Groups.
6852 Type Unit Groups are a way to collapse the set of all TUs (type units) into
6853 a more manageable set. The grouping is done by DW_AT_stmt_list entry
6854 so that all types coming from the same compilation (.o file) are grouped
6855 together. A future step could be to put the types in the same symtab as
6856 the CU the types ultimately came from. */
6859 hash_type_unit_group (const void *item)
6861 const struct type_unit_group *tu_group
6862 = (const struct type_unit_group *) item;
6864 return hash_stmt_list_entry (&tu_group->hash);
6868 eq_type_unit_group (const void *item_lhs, const void *item_rhs)
6870 const struct type_unit_group *lhs = (const struct type_unit_group *) item_lhs;
6871 const struct type_unit_group *rhs = (const struct type_unit_group *) item_rhs;
6873 return eq_stmt_list_entry (&lhs->hash, &rhs->hash);
6876 /* Allocate a hash table for type unit groups. */
6879 allocate_type_unit_groups_table (void)
6881 return htab_create_alloc_ex (3,
6882 hash_type_unit_group,
6885 &dwarf2_per_objfile->objfile->objfile_obstack,
6886 hashtab_obstack_allocate,
6887 dummy_obstack_deallocate);
6890 /* Type units that don't have DW_AT_stmt_list are grouped into their own
6891 partial symtabs. We combine several TUs per psymtab to not let the size
6892 of any one psymtab grow too big. */
6893 #define NO_STMT_LIST_TYPE_UNIT_PSYMTAB (1 << 31)
6894 #define NO_STMT_LIST_TYPE_UNIT_PSYMTAB_SIZE 10
6896 /* Helper routine for get_type_unit_group.
6897 Create the type_unit_group object used to hold one or more TUs. */
6899 static struct type_unit_group *
6900 create_type_unit_group (struct dwarf2_cu *cu, sect_offset line_offset_struct)
6902 struct objfile *objfile = dwarf2_per_objfile->objfile;
6903 struct dwarf2_per_cu_data *per_cu;
6904 struct type_unit_group *tu_group;
6906 tu_group = OBSTACK_ZALLOC (&objfile->objfile_obstack,
6907 struct type_unit_group);
6908 per_cu = &tu_group->per_cu;
6909 per_cu->objfile = objfile;
6911 if (dwarf2_per_objfile->using_index)
6913 per_cu->v.quick = OBSTACK_ZALLOC (&objfile->objfile_obstack,
6914 struct dwarf2_per_cu_quick_data);
6918 unsigned int line_offset = to_underlying (line_offset_struct);
6919 struct partial_symtab *pst;
6922 /* Give the symtab a useful name for debug purposes. */
6923 if ((line_offset & NO_STMT_LIST_TYPE_UNIT_PSYMTAB) != 0)
6924 name = xstrprintf ("<type_units_%d>",
6925 (line_offset & ~NO_STMT_LIST_TYPE_UNIT_PSYMTAB));
6927 name = xstrprintf ("<type_units_at_0x%x>", line_offset);
6929 pst = create_partial_symtab (per_cu, name);
6935 tu_group->hash.dwo_unit = cu->dwo_unit;
6936 tu_group->hash.line_sect_off = line_offset_struct;
6941 /* Look up the type_unit_group for type unit CU, and create it if necessary.
6942 STMT_LIST is a DW_AT_stmt_list attribute. */
6944 static struct type_unit_group *
6945 get_type_unit_group (struct dwarf2_cu *cu, const struct attribute *stmt_list)
6947 struct tu_stats *tu_stats = &dwarf2_per_objfile->tu_stats;
6948 struct type_unit_group *tu_group;
6950 unsigned int line_offset;
6951 struct type_unit_group type_unit_group_for_lookup;
6953 if (dwarf2_per_objfile->type_unit_groups == NULL)
6955 dwarf2_per_objfile->type_unit_groups =
6956 allocate_type_unit_groups_table ();
6959 /* Do we need to create a new group, or can we use an existing one? */
6963 line_offset = DW_UNSND (stmt_list);
6964 ++tu_stats->nr_symtab_sharers;
6968 /* Ugh, no stmt_list. Rare, but we have to handle it.
6969 We can do various things here like create one group per TU or
6970 spread them over multiple groups to split up the expansion work.
6971 To avoid worst case scenarios (too many groups or too large groups)
6972 we, umm, group them in bunches. */
6973 line_offset = (NO_STMT_LIST_TYPE_UNIT_PSYMTAB
6974 | (tu_stats->nr_stmt_less_type_units
6975 / NO_STMT_LIST_TYPE_UNIT_PSYMTAB_SIZE));
6976 ++tu_stats->nr_stmt_less_type_units;
6979 type_unit_group_for_lookup.hash.dwo_unit = cu->dwo_unit;
6980 type_unit_group_for_lookup.hash.line_sect_off = (sect_offset) line_offset;
6981 slot = htab_find_slot (dwarf2_per_objfile->type_unit_groups,
6982 &type_unit_group_for_lookup, INSERT);
6985 tu_group = (struct type_unit_group *) *slot;
6986 gdb_assert (tu_group != NULL);
6990 sect_offset line_offset_struct = (sect_offset) line_offset;
6991 tu_group = create_type_unit_group (cu, line_offset_struct);
6993 ++tu_stats->nr_symtabs;
6999 /* Partial symbol tables. */
7001 /* Create a psymtab named NAME and assign it to PER_CU.
7003 The caller must fill in the following details:
7004 dirname, textlow, texthigh. */
7006 static struct partial_symtab *
7007 create_partial_symtab (struct dwarf2_per_cu_data *per_cu, const char *name)
7009 struct objfile *objfile = per_cu->objfile;
7010 struct partial_symtab *pst;
7012 pst = start_psymtab_common (objfile, name, 0,
7013 objfile->global_psymbols,
7014 objfile->static_psymbols);
7016 pst->psymtabs_addrmap_supported = 1;
7018 /* This is the glue that links PST into GDB's symbol API. */
7019 pst->read_symtab_private = per_cu;
7020 pst->read_symtab = dwarf2_read_symtab;
7021 per_cu->v.psymtab = pst;
7026 /* The DATA object passed to process_psymtab_comp_unit_reader has this
7029 struct process_psymtab_comp_unit_data
7031 /* True if we are reading a DW_TAG_partial_unit. */
7033 int want_partial_unit;
7035 /* The "pretend" language that is used if the CU doesn't declare a
7038 enum language pretend_language;
7041 /* die_reader_func for process_psymtab_comp_unit. */
7044 process_psymtab_comp_unit_reader (const struct die_reader_specs *reader,
7045 const gdb_byte *info_ptr,
7046 struct die_info *comp_unit_die,
7050 struct dwarf2_cu *cu = reader->cu;
7051 struct objfile *objfile = cu->objfile;
7052 struct gdbarch *gdbarch = get_objfile_arch (objfile);
7053 struct dwarf2_per_cu_data *per_cu = cu->per_cu;
7055 CORE_ADDR best_lowpc = 0, best_highpc = 0;
7056 struct partial_symtab *pst;
7057 enum pc_bounds_kind cu_bounds_kind;
7058 const char *filename;
7059 struct process_psymtab_comp_unit_data *info
7060 = (struct process_psymtab_comp_unit_data *) data;
7062 if (comp_unit_die->tag == DW_TAG_partial_unit && !info->want_partial_unit)
7065 gdb_assert (! per_cu->is_debug_types);
7067 prepare_one_comp_unit (cu, comp_unit_die, info->pretend_language);
7069 cu->list_in_scope = &file_symbols;
7071 /* Allocate a new partial symbol table structure. */
7072 filename = dwarf2_string_attr (comp_unit_die, DW_AT_name, cu);
7073 if (filename == NULL)
7076 pst = create_partial_symtab (per_cu, filename);
7078 /* This must be done before calling dwarf2_build_include_psymtabs. */
7079 pst->dirname = dwarf2_string_attr (comp_unit_die, DW_AT_comp_dir, cu);
7081 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
7083 dwarf2_find_base_address (comp_unit_die, cu);
7085 /* Possibly set the default values of LOWPC and HIGHPC from
7087 cu_bounds_kind = dwarf2_get_pc_bounds (comp_unit_die, &best_lowpc,
7088 &best_highpc, cu, pst);
7089 if (cu_bounds_kind == PC_BOUNDS_HIGH_LOW && best_lowpc < best_highpc)
7090 /* Store the contiguous range if it is not empty; it can be empty for
7091 CUs with no code. */
7092 addrmap_set_empty (objfile->psymtabs_addrmap,
7093 gdbarch_adjust_dwarf2_addr (gdbarch,
7094 best_lowpc + baseaddr),
7095 gdbarch_adjust_dwarf2_addr (gdbarch,
7096 best_highpc + baseaddr) - 1,
7099 /* Check if comp unit has_children.
7100 If so, read the rest of the partial symbols from this comp unit.
7101 If not, there's no more debug_info for this comp unit. */
7104 struct partial_die_info *first_die;
7105 CORE_ADDR lowpc, highpc;
7107 lowpc = ((CORE_ADDR) -1);
7108 highpc = ((CORE_ADDR) 0);
7110 first_die = load_partial_dies (reader, info_ptr, 1);
7112 scan_partial_symbols (first_die, &lowpc, &highpc,
7113 cu_bounds_kind <= PC_BOUNDS_INVALID, cu);
7115 /* If we didn't find a lowpc, set it to highpc to avoid
7116 complaints from `maint check'. */
7117 if (lowpc == ((CORE_ADDR) -1))
7120 /* If the compilation unit didn't have an explicit address range,
7121 then use the information extracted from its child dies. */
7122 if (cu_bounds_kind <= PC_BOUNDS_INVALID)
7125 best_highpc = highpc;
7128 pst->textlow = gdbarch_adjust_dwarf2_addr (gdbarch, best_lowpc + baseaddr);
7129 pst->texthigh = gdbarch_adjust_dwarf2_addr (gdbarch, best_highpc + baseaddr);
7131 end_psymtab_common (objfile, pst);
7133 if (!VEC_empty (dwarf2_per_cu_ptr, cu->per_cu->imported_symtabs))
7136 int len = VEC_length (dwarf2_per_cu_ptr, cu->per_cu->imported_symtabs);
7137 struct dwarf2_per_cu_data *iter;
7139 /* Fill in 'dependencies' here; we fill in 'users' in a
7141 pst->number_of_dependencies = len;
7143 XOBNEWVEC (&objfile->objfile_obstack, struct partial_symtab *, len);
7145 VEC_iterate (dwarf2_per_cu_ptr, cu->per_cu->imported_symtabs,
7148 pst->dependencies[i] = iter->v.psymtab;
7150 VEC_free (dwarf2_per_cu_ptr, cu->per_cu->imported_symtabs);
7153 /* Get the list of files included in the current compilation unit,
7154 and build a psymtab for each of them. */
7155 dwarf2_build_include_psymtabs (cu, comp_unit_die, pst);
7157 if (dwarf_read_debug)
7159 struct gdbarch *gdbarch = get_objfile_arch (objfile);
7161 fprintf_unfiltered (gdb_stdlog,
7162 "Psymtab for %s unit @0x%x: %s - %s"
7163 ", %d global, %d static syms\n",
7164 per_cu->is_debug_types ? "type" : "comp",
7165 to_underlying (per_cu->sect_off),
7166 paddress (gdbarch, pst->textlow),
7167 paddress (gdbarch, pst->texthigh),
7168 pst->n_global_syms, pst->n_static_syms);
7172 /* Subroutine of dwarf2_build_psymtabs_hard to simplify it.
7173 Process compilation unit THIS_CU for a psymtab. */
7176 process_psymtab_comp_unit (struct dwarf2_per_cu_data *this_cu,
7177 int want_partial_unit,
7178 enum language pretend_language)
7180 /* If this compilation unit was already read in, free the
7181 cached copy in order to read it in again. This is
7182 necessary because we skipped some symbols when we first
7183 read in the compilation unit (see load_partial_dies).
7184 This problem could be avoided, but the benefit is unclear. */
7185 if (this_cu->cu != NULL)
7186 free_one_cached_comp_unit (this_cu);
7188 if (this_cu->is_debug_types)
7189 init_cutu_and_read_dies (this_cu, NULL, 0, 0, build_type_psymtabs_reader,
7193 process_psymtab_comp_unit_data info;
7194 info.want_partial_unit = want_partial_unit;
7195 info.pretend_language = pretend_language;
7196 init_cutu_and_read_dies (this_cu, NULL, 0, 0,
7197 process_psymtab_comp_unit_reader, &info);
7200 /* Age out any secondary CUs. */
7201 age_cached_comp_units ();
7204 /* Reader function for build_type_psymtabs. */
7207 build_type_psymtabs_reader (const struct die_reader_specs *reader,
7208 const gdb_byte *info_ptr,
7209 struct die_info *type_unit_die,
7213 struct objfile *objfile = dwarf2_per_objfile->objfile;
7214 struct dwarf2_cu *cu = reader->cu;
7215 struct dwarf2_per_cu_data *per_cu = cu->per_cu;
7216 struct signatured_type *sig_type;
7217 struct type_unit_group *tu_group;
7218 struct attribute *attr;
7219 struct partial_die_info *first_die;
7220 CORE_ADDR lowpc, highpc;
7221 struct partial_symtab *pst;
7223 gdb_assert (data == NULL);
7224 gdb_assert (per_cu->is_debug_types);
7225 sig_type = (struct signatured_type *) per_cu;
7230 attr = dwarf2_attr_no_follow (type_unit_die, DW_AT_stmt_list);
7231 tu_group = get_type_unit_group (cu, attr);
7233 VEC_safe_push (sig_type_ptr, tu_group->tus, sig_type);
7235 prepare_one_comp_unit (cu, type_unit_die, language_minimal);
7236 cu->list_in_scope = &file_symbols;
7237 pst = create_partial_symtab (per_cu, "");
7240 first_die = load_partial_dies (reader, info_ptr, 1);
7242 lowpc = (CORE_ADDR) -1;
7243 highpc = (CORE_ADDR) 0;
7244 scan_partial_symbols (first_die, &lowpc, &highpc, 0, cu);
7246 end_psymtab_common (objfile, pst);
7249 /* Struct used to sort TUs by their abbreviation table offset. */
7251 struct tu_abbrev_offset
7253 struct signatured_type *sig_type;
7254 sect_offset abbrev_offset;
7257 /* Helper routine for build_type_psymtabs_1, passed to qsort. */
7260 sort_tu_by_abbrev_offset (const void *ap, const void *bp)
7262 const struct tu_abbrev_offset * const *a
7263 = (const struct tu_abbrev_offset * const*) ap;
7264 const struct tu_abbrev_offset * const *b
7265 = (const struct tu_abbrev_offset * const*) bp;
7266 sect_offset aoff = (*a)->abbrev_offset;
7267 sect_offset boff = (*b)->abbrev_offset;
7269 return (aoff > boff) - (aoff < boff);
7272 /* Efficiently read all the type units.
7273 This does the bulk of the work for build_type_psymtabs.
7275 The efficiency is because we sort TUs by the abbrev table they use and
7276 only read each abbrev table once. In one program there are 200K TUs
7277 sharing 8K abbrev tables.
7279 The main purpose of this function is to support building the
7280 dwarf2_per_objfile->type_unit_groups table.
7281 TUs typically share the DW_AT_stmt_list of the CU they came from, so we
7282 can collapse the search space by grouping them by stmt_list.
7283 The savings can be significant, in the same program from above the 200K TUs
7284 share 8K stmt_list tables.
7286 FUNC is expected to call get_type_unit_group, which will create the
7287 struct type_unit_group if necessary and add it to
7288 dwarf2_per_objfile->type_unit_groups. */
7291 build_type_psymtabs_1 (void)
7293 struct tu_stats *tu_stats = &dwarf2_per_objfile->tu_stats;
7294 struct cleanup *cleanups;
7295 struct abbrev_table *abbrev_table;
7296 sect_offset abbrev_offset;
7297 struct tu_abbrev_offset *sorted_by_abbrev;
7300 /* It's up to the caller to not call us multiple times. */
7301 gdb_assert (dwarf2_per_objfile->type_unit_groups == NULL);
7303 if (dwarf2_per_objfile->n_type_units == 0)
7306 /* TUs typically share abbrev tables, and there can be way more TUs than
7307 abbrev tables. Sort by abbrev table to reduce the number of times we
7308 read each abbrev table in.
7309 Alternatives are to punt or to maintain a cache of abbrev tables.
7310 This is simpler and efficient enough for now.
7312 Later we group TUs by their DW_AT_stmt_list value (as this defines the
7313 symtab to use). Typically TUs with the same abbrev offset have the same
7314 stmt_list value too so in practice this should work well.
7316 The basic algorithm here is:
7318 sort TUs by abbrev table
7319 for each TU with same abbrev table:
7320 read abbrev table if first user
7321 read TU top level DIE
7322 [IWBN if DWO skeletons had DW_AT_stmt_list]
7325 if (dwarf_read_debug)
7326 fprintf_unfiltered (gdb_stdlog, "Building type unit groups ...\n");
7328 /* Sort in a separate table to maintain the order of all_type_units
7329 for .gdb_index: TU indices directly index all_type_units. */
7330 sorted_by_abbrev = XNEWVEC (struct tu_abbrev_offset,
7331 dwarf2_per_objfile->n_type_units);
7332 for (i = 0; i < dwarf2_per_objfile->n_type_units; ++i)
7334 struct signatured_type *sig_type = dwarf2_per_objfile->all_type_units[i];
7336 sorted_by_abbrev[i].sig_type = sig_type;
7337 sorted_by_abbrev[i].abbrev_offset =
7338 read_abbrev_offset (sig_type->per_cu.section,
7339 sig_type->per_cu.sect_off);
7341 cleanups = make_cleanup (xfree, sorted_by_abbrev);
7342 qsort (sorted_by_abbrev, dwarf2_per_objfile->n_type_units,
7343 sizeof (struct tu_abbrev_offset), sort_tu_by_abbrev_offset);
7345 abbrev_offset = (sect_offset) ~(unsigned) 0;
7346 abbrev_table = NULL;
7347 make_cleanup (abbrev_table_free_cleanup, &abbrev_table);
7349 for (i = 0; i < dwarf2_per_objfile->n_type_units; ++i)
7351 const struct tu_abbrev_offset *tu = &sorted_by_abbrev[i];
7353 /* Switch to the next abbrev table if necessary. */
7354 if (abbrev_table == NULL
7355 || tu->abbrev_offset != abbrev_offset)
7357 if (abbrev_table != NULL)
7359 abbrev_table_free (abbrev_table);
7360 /* Reset to NULL in case abbrev_table_read_table throws
7361 an error: abbrev_table_free_cleanup will get called. */
7362 abbrev_table = NULL;
7364 abbrev_offset = tu->abbrev_offset;
7366 abbrev_table_read_table (&dwarf2_per_objfile->abbrev,
7368 ++tu_stats->nr_uniq_abbrev_tables;
7371 init_cutu_and_read_dies (&tu->sig_type->per_cu, abbrev_table, 0, 0,
7372 build_type_psymtabs_reader, NULL);
7375 do_cleanups (cleanups);
7378 /* Print collected type unit statistics. */
7381 print_tu_stats (void)
7383 struct tu_stats *tu_stats = &dwarf2_per_objfile->tu_stats;
7385 fprintf_unfiltered (gdb_stdlog, "Type unit statistics:\n");
7386 fprintf_unfiltered (gdb_stdlog, " %d TUs\n",
7387 dwarf2_per_objfile->n_type_units);
7388 fprintf_unfiltered (gdb_stdlog, " %d uniq abbrev tables\n",
7389 tu_stats->nr_uniq_abbrev_tables);
7390 fprintf_unfiltered (gdb_stdlog, " %d symtabs from stmt_list entries\n",
7391 tu_stats->nr_symtabs);
7392 fprintf_unfiltered (gdb_stdlog, " %d symtab sharers\n",
7393 tu_stats->nr_symtab_sharers);
7394 fprintf_unfiltered (gdb_stdlog, " %d type units without a stmt_list\n",
7395 tu_stats->nr_stmt_less_type_units);
7396 fprintf_unfiltered (gdb_stdlog, " %d all_type_units reallocs\n",
7397 tu_stats->nr_all_type_units_reallocs);
7400 /* Traversal function for build_type_psymtabs. */
7403 build_type_psymtab_dependencies (void **slot, void *info)
7405 struct objfile *objfile = dwarf2_per_objfile->objfile;
7406 struct type_unit_group *tu_group = (struct type_unit_group *) *slot;
7407 struct dwarf2_per_cu_data *per_cu = &tu_group->per_cu;
7408 struct partial_symtab *pst = per_cu->v.psymtab;
7409 int len = VEC_length (sig_type_ptr, tu_group->tus);
7410 struct signatured_type *iter;
7413 gdb_assert (len > 0);
7414 gdb_assert (IS_TYPE_UNIT_GROUP (per_cu));
7416 pst->number_of_dependencies = len;
7418 XOBNEWVEC (&objfile->objfile_obstack, struct partial_symtab *, len);
7420 VEC_iterate (sig_type_ptr, tu_group->tus, i, iter);
7423 gdb_assert (iter->per_cu.is_debug_types);
7424 pst->dependencies[i] = iter->per_cu.v.psymtab;
7425 iter->type_unit_group = tu_group;
7428 VEC_free (sig_type_ptr, tu_group->tus);
7433 /* Subroutine of dwarf2_build_psymtabs_hard to simplify it.
7434 Build partial symbol tables for the .debug_types comp-units. */
7437 build_type_psymtabs (struct objfile *objfile)
7439 if (! create_all_type_units (objfile))
7442 build_type_psymtabs_1 ();
7445 /* Traversal function for process_skeletonless_type_unit.
7446 Read a TU in a DWO file and build partial symbols for it. */
7449 process_skeletonless_type_unit (void **slot, void *info)
7451 struct dwo_unit *dwo_unit = (struct dwo_unit *) *slot;
7452 struct objfile *objfile = (struct objfile *) info;
7453 struct signatured_type find_entry, *entry;
7455 /* If this TU doesn't exist in the global table, add it and read it in. */
7457 if (dwarf2_per_objfile->signatured_types == NULL)
7459 dwarf2_per_objfile->signatured_types
7460 = allocate_signatured_type_table (objfile);
7463 find_entry.signature = dwo_unit->signature;
7464 slot = htab_find_slot (dwarf2_per_objfile->signatured_types, &find_entry,
7466 /* If we've already seen this type there's nothing to do. What's happening
7467 is we're doing our own version of comdat-folding here. */
7471 /* This does the job that create_all_type_units would have done for
7473 entry = add_type_unit (dwo_unit->signature, slot);
7474 fill_in_sig_entry_from_dwo_entry (objfile, entry, dwo_unit);
7477 /* This does the job that build_type_psymtabs_1 would have done. */
7478 init_cutu_and_read_dies (&entry->per_cu, NULL, 0, 0,
7479 build_type_psymtabs_reader, NULL);
7484 /* Traversal function for process_skeletonless_type_units. */
7487 process_dwo_file_for_skeletonless_type_units (void **slot, void *info)
7489 struct dwo_file *dwo_file = (struct dwo_file *) *slot;
7491 if (dwo_file->tus != NULL)
7493 htab_traverse_noresize (dwo_file->tus,
7494 process_skeletonless_type_unit, info);
7500 /* Scan all TUs of DWO files, verifying we've processed them.
7501 This is needed in case a TU was emitted without its skeleton.
7502 Note: This can't be done until we know what all the DWO files are. */
7505 process_skeletonless_type_units (struct objfile *objfile)
7507 /* Skeletonless TUs in DWP files without .gdb_index is not supported yet. */
7508 if (get_dwp_file () == NULL
7509 && dwarf2_per_objfile->dwo_files != NULL)
7511 htab_traverse_noresize (dwarf2_per_objfile->dwo_files,
7512 process_dwo_file_for_skeletonless_type_units,
7517 /* Compute the 'user' field for each psymtab in OBJFILE. */
7520 set_partial_user (struct objfile *objfile)
7524 for (i = 0; i < dwarf2_per_objfile->n_comp_units; ++i)
7526 struct dwarf2_per_cu_data *per_cu = dw2_get_cutu (i);
7527 struct partial_symtab *pst = per_cu->v.psymtab;
7533 for (j = 0; j < pst->number_of_dependencies; ++j)
7535 /* Set the 'user' field only if it is not already set. */
7536 if (pst->dependencies[j]->user == NULL)
7537 pst->dependencies[j]->user = pst;
7542 /* Build the partial symbol table by doing a quick pass through the
7543 .debug_info and .debug_abbrev sections. */
7546 dwarf2_build_psymtabs_hard (struct objfile *objfile)
7548 struct cleanup *back_to;
7551 if (dwarf_read_debug)
7553 fprintf_unfiltered (gdb_stdlog, "Building psymtabs of objfile %s ...\n",
7554 objfile_name (objfile));
7557 dwarf2_per_objfile->reading_partial_symbols = 1;
7559 dwarf2_read_section (objfile, &dwarf2_per_objfile->info);
7561 /* Any cached compilation units will be linked by the per-objfile
7562 read_in_chain. Make sure to free them when we're done. */
7563 back_to = make_cleanup (free_cached_comp_units, NULL);
7565 build_type_psymtabs (objfile);
7567 create_all_comp_units (objfile);
7569 /* Create a temporary address map on a temporary obstack. We later
7570 copy this to the final obstack. */
7571 auto_obstack temp_obstack;
7573 scoped_restore save_psymtabs_addrmap
7574 = make_scoped_restore (&objfile->psymtabs_addrmap,
7575 addrmap_create_mutable (&temp_obstack));
7577 for (i = 0; i < dwarf2_per_objfile->n_comp_units; ++i)
7579 struct dwarf2_per_cu_data *per_cu = dw2_get_cutu (i);
7581 process_psymtab_comp_unit (per_cu, 0, language_minimal);
7584 /* This has to wait until we read the CUs, we need the list of DWOs. */
7585 process_skeletonless_type_units (objfile);
7587 /* Now that all TUs have been processed we can fill in the dependencies. */
7588 if (dwarf2_per_objfile->type_unit_groups != NULL)
7590 htab_traverse_noresize (dwarf2_per_objfile->type_unit_groups,
7591 build_type_psymtab_dependencies, NULL);
7594 if (dwarf_read_debug)
7597 set_partial_user (objfile);
7599 objfile->psymtabs_addrmap = addrmap_create_fixed (objfile->psymtabs_addrmap,
7600 &objfile->objfile_obstack);
7601 /* At this point we want to keep the address map. */
7602 save_psymtabs_addrmap.release ();
7604 do_cleanups (back_to);
7606 if (dwarf_read_debug)
7607 fprintf_unfiltered (gdb_stdlog, "Done building psymtabs of %s\n",
7608 objfile_name (objfile));
7611 /* die_reader_func for load_partial_comp_unit. */
7614 load_partial_comp_unit_reader (const struct die_reader_specs *reader,
7615 const gdb_byte *info_ptr,
7616 struct die_info *comp_unit_die,
7620 struct dwarf2_cu *cu = reader->cu;
7622 prepare_one_comp_unit (cu, comp_unit_die, language_minimal);
7624 /* Check if comp unit has_children.
7625 If so, read the rest of the partial symbols from this comp unit.
7626 If not, there's no more debug_info for this comp unit. */
7628 load_partial_dies (reader, info_ptr, 0);
7631 /* Load the partial DIEs for a secondary CU into memory.
7632 This is also used when rereading a primary CU with load_all_dies. */
7635 load_partial_comp_unit (struct dwarf2_per_cu_data *this_cu)
7637 init_cutu_and_read_dies (this_cu, NULL, 1, 1,
7638 load_partial_comp_unit_reader, NULL);
7642 read_comp_units_from_section (struct objfile *objfile,
7643 struct dwarf2_section_info *section,
7644 struct dwarf2_section_info *abbrev_section,
7645 unsigned int is_dwz,
7648 struct dwarf2_per_cu_data ***all_comp_units)
7650 const gdb_byte *info_ptr;
7651 bfd *abfd = get_section_bfd_owner (section);
7653 if (dwarf_read_debug)
7654 fprintf_unfiltered (gdb_stdlog, "Reading %s for %s\n",
7655 get_section_name (section),
7656 get_section_file_name (section));
7658 dwarf2_read_section (objfile, section);
7660 info_ptr = section->buffer;
7662 while (info_ptr < section->buffer + section->size)
7664 struct dwarf2_per_cu_data *this_cu;
7666 sect_offset sect_off = (sect_offset) (info_ptr - section->buffer);
7668 comp_unit_head cu_header;
7669 read_and_check_comp_unit_head (&cu_header, section, abbrev_section,
7670 info_ptr, rcuh_kind::COMPILE);
7672 /* Save the compilation unit for later lookup. */
7673 if (cu_header.unit_type != DW_UT_type)
7675 this_cu = XOBNEW (&objfile->objfile_obstack,
7676 struct dwarf2_per_cu_data);
7677 memset (this_cu, 0, sizeof (*this_cu));
7681 auto sig_type = XOBNEW (&objfile->objfile_obstack,
7682 struct signatured_type);
7683 memset (sig_type, 0, sizeof (*sig_type));
7684 sig_type->signature = cu_header.signature;
7685 sig_type->type_offset_in_tu = cu_header.type_cu_offset_in_tu;
7686 this_cu = &sig_type->per_cu;
7688 this_cu->is_debug_types = (cu_header.unit_type == DW_UT_type);
7689 this_cu->sect_off = sect_off;
7690 this_cu->length = cu_header.length + cu_header.initial_length_size;
7691 this_cu->is_dwz = is_dwz;
7692 this_cu->objfile = objfile;
7693 this_cu->section = section;
7695 if (*n_comp_units == *n_allocated)
7698 *all_comp_units = XRESIZEVEC (struct dwarf2_per_cu_data *,
7699 *all_comp_units, *n_allocated);
7701 (*all_comp_units)[*n_comp_units] = this_cu;
7704 info_ptr = info_ptr + this_cu->length;
7708 /* Create a list of all compilation units in OBJFILE.
7709 This is only done for -readnow and building partial symtabs. */
7712 create_all_comp_units (struct objfile *objfile)
7716 struct dwarf2_per_cu_data **all_comp_units;
7717 struct dwz_file *dwz;
7721 all_comp_units = XNEWVEC (struct dwarf2_per_cu_data *, n_allocated);
7723 read_comp_units_from_section (objfile, &dwarf2_per_objfile->info,
7724 &dwarf2_per_objfile->abbrev, 0,
7725 &n_allocated, &n_comp_units, &all_comp_units);
7727 dwz = dwarf2_get_dwz_file ();
7729 read_comp_units_from_section (objfile, &dwz->info, &dwz->abbrev, 1,
7730 &n_allocated, &n_comp_units,
7733 dwarf2_per_objfile->all_comp_units = XOBNEWVEC (&objfile->objfile_obstack,
7734 struct dwarf2_per_cu_data *,
7736 memcpy (dwarf2_per_objfile->all_comp_units, all_comp_units,
7737 n_comp_units * sizeof (struct dwarf2_per_cu_data *));
7738 xfree (all_comp_units);
7739 dwarf2_per_objfile->n_comp_units = n_comp_units;
7742 /* Process all loaded DIEs for compilation unit CU, starting at
7743 FIRST_DIE. The caller should pass SET_ADDRMAP == 1 if the compilation
7744 unit DIE did not have PC info (DW_AT_low_pc and DW_AT_high_pc, or
7745 DW_AT_ranges). See the comments of add_partial_subprogram on how
7746 SET_ADDRMAP is used and how *LOWPC and *HIGHPC are updated. */
7749 scan_partial_symbols (struct partial_die_info *first_die, CORE_ADDR *lowpc,
7750 CORE_ADDR *highpc, int set_addrmap,
7751 struct dwarf2_cu *cu)
7753 struct partial_die_info *pdi;
7755 /* Now, march along the PDI's, descending into ones which have
7756 interesting children but skipping the children of the other ones,
7757 until we reach the end of the compilation unit. */
7763 fixup_partial_die (pdi, cu);
7765 /* Anonymous namespaces or modules have no name but have interesting
7766 children, so we need to look at them. Ditto for anonymous
7769 if (pdi->name != NULL || pdi->tag == DW_TAG_namespace
7770 || pdi->tag == DW_TAG_module || pdi->tag == DW_TAG_enumeration_type
7771 || pdi->tag == DW_TAG_imported_unit)
7775 case DW_TAG_subprogram:
7776 add_partial_subprogram (pdi, lowpc, highpc, set_addrmap, cu);
7778 case DW_TAG_constant:
7779 case DW_TAG_variable:
7780 case DW_TAG_typedef:
7781 case DW_TAG_union_type:
7782 if (!pdi->is_declaration)
7784 add_partial_symbol (pdi, cu);
7787 case DW_TAG_class_type:
7788 case DW_TAG_interface_type:
7789 case DW_TAG_structure_type:
7790 if (!pdi->is_declaration)
7792 add_partial_symbol (pdi, cu);
7794 if (cu->language == language_rust && pdi->has_children)
7795 scan_partial_symbols (pdi->die_child, lowpc, highpc,
7798 case DW_TAG_enumeration_type:
7799 if (!pdi->is_declaration)
7800 add_partial_enumeration (pdi, cu);
7802 case DW_TAG_base_type:
7803 case DW_TAG_subrange_type:
7804 /* File scope base type definitions are added to the partial
7806 add_partial_symbol (pdi, cu);
7808 case DW_TAG_namespace:
7809 add_partial_namespace (pdi, lowpc, highpc, set_addrmap, cu);
7812 add_partial_module (pdi, lowpc, highpc, set_addrmap, cu);
7814 case DW_TAG_imported_unit:
7816 struct dwarf2_per_cu_data *per_cu;
7818 /* For now we don't handle imported units in type units. */
7819 if (cu->per_cu->is_debug_types)
7821 error (_("Dwarf Error: DW_TAG_imported_unit is not"
7822 " supported in type units [in module %s]"),
7823 objfile_name (cu->objfile));
7826 per_cu = dwarf2_find_containing_comp_unit (pdi->d.sect_off,
7830 /* Go read the partial unit, if needed. */
7831 if (per_cu->v.psymtab == NULL)
7832 process_psymtab_comp_unit (per_cu, 1, cu->language);
7834 VEC_safe_push (dwarf2_per_cu_ptr,
7835 cu->per_cu->imported_symtabs, per_cu);
7838 case DW_TAG_imported_declaration:
7839 add_partial_symbol (pdi, cu);
7846 /* If the die has a sibling, skip to the sibling. */
7848 pdi = pdi->die_sibling;
7852 /* Functions used to compute the fully scoped name of a partial DIE.
7854 Normally, this is simple. For C++, the parent DIE's fully scoped
7855 name is concatenated with "::" and the partial DIE's name.
7856 Enumerators are an exception; they use the scope of their parent
7857 enumeration type, i.e. the name of the enumeration type is not
7858 prepended to the enumerator.
7860 There are two complexities. One is DW_AT_specification; in this
7861 case "parent" means the parent of the target of the specification,
7862 instead of the direct parent of the DIE. The other is compilers
7863 which do not emit DW_TAG_namespace; in this case we try to guess
7864 the fully qualified name of structure types from their members'
7865 linkage names. This must be done using the DIE's children rather
7866 than the children of any DW_AT_specification target. We only need
7867 to do this for structures at the top level, i.e. if the target of
7868 any DW_AT_specification (if any; otherwise the DIE itself) does not
7871 /* Compute the scope prefix associated with PDI's parent, in
7872 compilation unit CU. The result will be allocated on CU's
7873 comp_unit_obstack, or a copy of the already allocated PDI->NAME
7874 field. NULL is returned if no prefix is necessary. */
7876 partial_die_parent_scope (struct partial_die_info *pdi,
7877 struct dwarf2_cu *cu)
7879 const char *grandparent_scope;
7880 struct partial_die_info *parent, *real_pdi;
7882 /* We need to look at our parent DIE; if we have a DW_AT_specification,
7883 then this means the parent of the specification DIE. */
7886 while (real_pdi->has_specification)
7887 real_pdi = find_partial_die (real_pdi->spec_offset,
7888 real_pdi->spec_is_dwz, cu);
7890 parent = real_pdi->die_parent;
7894 if (parent->scope_set)
7895 return parent->scope;
7897 fixup_partial_die (parent, cu);
7899 grandparent_scope = partial_die_parent_scope (parent, cu);
7901 /* GCC 4.0 and 4.1 had a bug (PR c++/28460) where they generated bogus
7902 DW_TAG_namespace DIEs with a name of "::" for the global namespace.
7903 Work around this problem here. */
7904 if (cu->language == language_cplus
7905 && parent->tag == DW_TAG_namespace
7906 && strcmp (parent->name, "::") == 0
7907 && grandparent_scope == NULL)
7909 parent->scope = NULL;
7910 parent->scope_set = 1;
7914 if (pdi->tag == DW_TAG_enumerator)
7915 /* Enumerators should not get the name of the enumeration as a prefix. */
7916 parent->scope = grandparent_scope;
7917 else if (parent->tag == DW_TAG_namespace
7918 || parent->tag == DW_TAG_module
7919 || parent->tag == DW_TAG_structure_type
7920 || parent->tag == DW_TAG_class_type
7921 || parent->tag == DW_TAG_interface_type
7922 || parent->tag == DW_TAG_union_type
7923 || parent->tag == DW_TAG_enumeration_type)
7925 if (grandparent_scope == NULL)
7926 parent->scope = parent->name;
7928 parent->scope = typename_concat (&cu->comp_unit_obstack,
7930 parent->name, 0, cu);
7934 /* FIXME drow/2004-04-01: What should we be doing with
7935 function-local names? For partial symbols, we should probably be
7937 complaint (&symfile_complaints,
7938 _("unhandled containing DIE tag %d for DIE at %d"),
7939 parent->tag, to_underlying (pdi->sect_off));
7940 parent->scope = grandparent_scope;
7943 parent->scope_set = 1;
7944 return parent->scope;
7947 /* Return the fully scoped name associated with PDI, from compilation unit
7948 CU. The result will be allocated with malloc. */
7951 partial_die_full_name (struct partial_die_info *pdi,
7952 struct dwarf2_cu *cu)
7954 const char *parent_scope;
7956 /* If this is a template instantiation, we can not work out the
7957 template arguments from partial DIEs. So, unfortunately, we have
7958 to go through the full DIEs. At least any work we do building
7959 types here will be reused if full symbols are loaded later. */
7960 if (pdi->has_template_arguments)
7962 fixup_partial_die (pdi, cu);
7964 if (pdi->name != NULL && strchr (pdi->name, '<') == NULL)
7966 struct die_info *die;
7967 struct attribute attr;
7968 struct dwarf2_cu *ref_cu = cu;
7970 /* DW_FORM_ref_addr is using section offset. */
7971 attr.name = (enum dwarf_attribute) 0;
7972 attr.form = DW_FORM_ref_addr;
7973 attr.u.unsnd = to_underlying (pdi->sect_off);
7974 die = follow_die_ref (NULL, &attr, &ref_cu);
7976 return xstrdup (dwarf2_full_name (NULL, die, ref_cu));
7980 parent_scope = partial_die_parent_scope (pdi, cu);
7981 if (parent_scope == NULL)
7984 return typename_concat (NULL, parent_scope, pdi->name, 0, cu);
7988 add_partial_symbol (struct partial_die_info *pdi, struct dwarf2_cu *cu)
7990 struct objfile *objfile = cu->objfile;
7991 struct gdbarch *gdbarch = get_objfile_arch (objfile);
7993 const char *actual_name = NULL;
7995 char *built_actual_name;
7997 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
7999 built_actual_name = partial_die_full_name (pdi, cu);
8000 if (built_actual_name != NULL)
8001 actual_name = built_actual_name;
8003 if (actual_name == NULL)
8004 actual_name = pdi->name;
8008 case DW_TAG_subprogram:
8009 addr = gdbarch_adjust_dwarf2_addr (gdbarch, pdi->lowpc + baseaddr);
8010 if (pdi->is_external || cu->language == language_ada)
8012 /* brobecker/2007-12-26: Normally, only "external" DIEs are part
8013 of the global scope. But in Ada, we want to be able to access
8014 nested procedures globally. So all Ada subprograms are stored
8015 in the global scope. */
8016 add_psymbol_to_list (actual_name, strlen (actual_name),
8017 built_actual_name != NULL,
8018 VAR_DOMAIN, LOC_BLOCK,
8019 &objfile->global_psymbols,
8020 addr, cu->language, objfile);
8024 add_psymbol_to_list (actual_name, strlen (actual_name),
8025 built_actual_name != NULL,
8026 VAR_DOMAIN, LOC_BLOCK,
8027 &objfile->static_psymbols,
8028 addr, cu->language, objfile);
8031 if (pdi->main_subprogram && actual_name != NULL)
8032 set_objfile_main_name (objfile, actual_name, cu->language);
8034 case DW_TAG_constant:
8036 std::vector<partial_symbol *> *list;
8038 if (pdi->is_external)
8039 list = &objfile->global_psymbols;
8041 list = &objfile->static_psymbols;
8042 add_psymbol_to_list (actual_name, strlen (actual_name),
8043 built_actual_name != NULL, VAR_DOMAIN, LOC_STATIC,
8044 list, 0, cu->language, objfile);
8047 case DW_TAG_variable:
8049 addr = decode_locdesc (pdi->d.locdesc, cu);
8053 && !dwarf2_per_objfile->has_section_at_zero)
8055 /* A global or static variable may also have been stripped
8056 out by the linker if unused, in which case its address
8057 will be nullified; do not add such variables into partial
8058 symbol table then. */
8060 else if (pdi->is_external)
8063 Don't enter into the minimal symbol tables as there is
8064 a minimal symbol table entry from the ELF symbols already.
8065 Enter into partial symbol table if it has a location
8066 descriptor or a type.
8067 If the location descriptor is missing, new_symbol will create
8068 a LOC_UNRESOLVED symbol, the address of the variable will then
8069 be determined from the minimal symbol table whenever the variable
8071 The address for the partial symbol table entry is not
8072 used by GDB, but it comes in handy for debugging partial symbol
8075 if (pdi->d.locdesc || pdi->has_type)
8076 add_psymbol_to_list (actual_name, strlen (actual_name),
8077 built_actual_name != NULL,
8078 VAR_DOMAIN, LOC_STATIC,
8079 &objfile->global_psymbols,
8081 cu->language, objfile);
8085 int has_loc = pdi->d.locdesc != NULL;
8087 /* Static Variable. Skip symbols whose value we cannot know (those
8088 without location descriptors or constant values). */
8089 if (!has_loc && !pdi->has_const_value)
8091 xfree (built_actual_name);
8095 add_psymbol_to_list (actual_name, strlen (actual_name),
8096 built_actual_name != NULL,
8097 VAR_DOMAIN, LOC_STATIC,
8098 &objfile->static_psymbols,
8099 has_loc ? addr + baseaddr : (CORE_ADDR) 0,
8100 cu->language, objfile);
8103 case DW_TAG_typedef:
8104 case DW_TAG_base_type:
8105 case DW_TAG_subrange_type:
8106 add_psymbol_to_list (actual_name, strlen (actual_name),
8107 built_actual_name != NULL,
8108 VAR_DOMAIN, LOC_TYPEDEF,
8109 &objfile->static_psymbols,
8110 0, cu->language, objfile);
8112 case DW_TAG_imported_declaration:
8113 case DW_TAG_namespace:
8114 add_psymbol_to_list (actual_name, strlen (actual_name),
8115 built_actual_name != NULL,
8116 VAR_DOMAIN, LOC_TYPEDEF,
8117 &objfile->global_psymbols,
8118 0, cu->language, objfile);
8121 add_psymbol_to_list (actual_name, strlen (actual_name),
8122 built_actual_name != NULL,
8123 MODULE_DOMAIN, LOC_TYPEDEF,
8124 &objfile->global_psymbols,
8125 0, cu->language, objfile);
8127 case DW_TAG_class_type:
8128 case DW_TAG_interface_type:
8129 case DW_TAG_structure_type:
8130 case DW_TAG_union_type:
8131 case DW_TAG_enumeration_type:
8132 /* Skip external references. The DWARF standard says in the section
8133 about "Structure, Union, and Class Type Entries": "An incomplete
8134 structure, union or class type is represented by a structure,
8135 union or class entry that does not have a byte size attribute
8136 and that has a DW_AT_declaration attribute." */
8137 if (!pdi->has_byte_size && pdi->is_declaration)
8139 xfree (built_actual_name);
8143 /* NOTE: carlton/2003-10-07: See comment in new_symbol about
8144 static vs. global. */
8145 add_psymbol_to_list (actual_name, strlen (actual_name),
8146 built_actual_name != NULL,
8147 STRUCT_DOMAIN, LOC_TYPEDEF,
8148 cu->language == language_cplus
8149 ? &objfile->global_psymbols
8150 : &objfile->static_psymbols,
8151 0, cu->language, objfile);
8154 case DW_TAG_enumerator:
8155 add_psymbol_to_list (actual_name, strlen (actual_name),
8156 built_actual_name != NULL,
8157 VAR_DOMAIN, LOC_CONST,
8158 cu->language == language_cplus
8159 ? &objfile->global_psymbols
8160 : &objfile->static_psymbols,
8161 0, cu->language, objfile);
8167 xfree (built_actual_name);
8170 /* Read a partial die corresponding to a namespace; also, add a symbol
8171 corresponding to that namespace to the symbol table. NAMESPACE is
8172 the name of the enclosing namespace. */
8175 add_partial_namespace (struct partial_die_info *pdi,
8176 CORE_ADDR *lowpc, CORE_ADDR *highpc,
8177 int set_addrmap, struct dwarf2_cu *cu)
8179 /* Add a symbol for the namespace. */
8181 add_partial_symbol (pdi, cu);
8183 /* Now scan partial symbols in that namespace. */
8185 if (pdi->has_children)
8186 scan_partial_symbols (pdi->die_child, lowpc, highpc, set_addrmap, cu);
8189 /* Read a partial die corresponding to a Fortran module. */
8192 add_partial_module (struct partial_die_info *pdi, CORE_ADDR *lowpc,
8193 CORE_ADDR *highpc, int set_addrmap, struct dwarf2_cu *cu)
8195 /* Add a symbol for the namespace. */
8197 add_partial_symbol (pdi, cu);
8199 /* Now scan partial symbols in that module. */
8201 if (pdi->has_children)
8202 scan_partial_symbols (pdi->die_child, lowpc, highpc, set_addrmap, cu);
8205 /* Read a partial die corresponding to a subprogram and create a partial
8206 symbol for that subprogram. When the CU language allows it, this
8207 routine also defines a partial symbol for each nested subprogram
8208 that this subprogram contains. If SET_ADDRMAP is true, record the
8209 covered ranges in the addrmap. Set *LOWPC and *HIGHPC to the lowest
8210 and highest PC values found in PDI.
8212 PDI may also be a lexical block, in which case we simply search
8213 recursively for subprograms defined inside that lexical block.
8214 Again, this is only performed when the CU language allows this
8215 type of definitions. */
8218 add_partial_subprogram (struct partial_die_info *pdi,
8219 CORE_ADDR *lowpc, CORE_ADDR *highpc,
8220 int set_addrmap, struct dwarf2_cu *cu)
8222 if (pdi->tag == DW_TAG_subprogram)
8224 if (pdi->has_pc_info)
8226 if (pdi->lowpc < *lowpc)
8227 *lowpc = pdi->lowpc;
8228 if (pdi->highpc > *highpc)
8229 *highpc = pdi->highpc;
8232 struct objfile *objfile = cu->objfile;
8233 struct gdbarch *gdbarch = get_objfile_arch (objfile);
8238 baseaddr = ANOFFSET (objfile->section_offsets,
8239 SECT_OFF_TEXT (objfile));
8240 lowpc = gdbarch_adjust_dwarf2_addr (gdbarch,
8241 pdi->lowpc + baseaddr);
8242 highpc = gdbarch_adjust_dwarf2_addr (gdbarch,
8243 pdi->highpc + baseaddr);
8244 addrmap_set_empty (objfile->psymtabs_addrmap, lowpc, highpc - 1,
8245 cu->per_cu->v.psymtab);
8249 if (pdi->has_pc_info || (!pdi->is_external && pdi->may_be_inlined))
8251 if (!pdi->is_declaration)
8252 /* Ignore subprogram DIEs that do not have a name, they are
8253 illegal. Do not emit a complaint at this point, we will
8254 do so when we convert this psymtab into a symtab. */
8256 add_partial_symbol (pdi, cu);
8260 if (! pdi->has_children)
8263 if (cu->language == language_ada)
8265 pdi = pdi->die_child;
8268 fixup_partial_die (pdi, cu);
8269 if (pdi->tag == DW_TAG_subprogram
8270 || pdi->tag == DW_TAG_lexical_block)
8271 add_partial_subprogram (pdi, lowpc, highpc, set_addrmap, cu);
8272 pdi = pdi->die_sibling;
8277 /* Read a partial die corresponding to an enumeration type. */
8280 add_partial_enumeration (struct partial_die_info *enum_pdi,
8281 struct dwarf2_cu *cu)
8283 struct partial_die_info *pdi;
8285 if (enum_pdi->name != NULL)
8286 add_partial_symbol (enum_pdi, cu);
8288 pdi = enum_pdi->die_child;
8291 if (pdi->tag != DW_TAG_enumerator || pdi->name == NULL)
8292 complaint (&symfile_complaints, _("malformed enumerator DIE ignored"));
8294 add_partial_symbol (pdi, cu);
8295 pdi = pdi->die_sibling;
8299 /* Return the initial uleb128 in the die at INFO_PTR. */
8302 peek_abbrev_code (bfd *abfd, const gdb_byte *info_ptr)
8304 unsigned int bytes_read;
8306 return read_unsigned_leb128 (abfd, info_ptr, &bytes_read);
8309 /* Read the initial uleb128 in the die at INFO_PTR in compilation unit CU.
8310 Return the corresponding abbrev, or NULL if the number is zero (indicating
8311 an empty DIE). In either case *BYTES_READ will be set to the length of
8312 the initial number. */
8314 static struct abbrev_info *
8315 peek_die_abbrev (const gdb_byte *info_ptr, unsigned int *bytes_read,
8316 struct dwarf2_cu *cu)
8318 bfd *abfd = cu->objfile->obfd;
8319 unsigned int abbrev_number;
8320 struct abbrev_info *abbrev;
8322 abbrev_number = read_unsigned_leb128 (abfd, info_ptr, bytes_read);
8324 if (abbrev_number == 0)
8327 abbrev = abbrev_table_lookup_abbrev (cu->abbrev_table, abbrev_number);
8330 error (_("Dwarf Error: Could not find abbrev number %d in %s"
8331 " at offset 0x%x [in module %s]"),
8332 abbrev_number, cu->per_cu->is_debug_types ? "TU" : "CU",
8333 to_underlying (cu->header.sect_off), bfd_get_filename (abfd));
8339 /* Scan the debug information for CU starting at INFO_PTR in buffer BUFFER.
8340 Returns a pointer to the end of a series of DIEs, terminated by an empty
8341 DIE. Any children of the skipped DIEs will also be skipped. */
8343 static const gdb_byte *
8344 skip_children (const struct die_reader_specs *reader, const gdb_byte *info_ptr)
8346 struct dwarf2_cu *cu = reader->cu;
8347 struct abbrev_info *abbrev;
8348 unsigned int bytes_read;
8352 abbrev = peek_die_abbrev (info_ptr, &bytes_read, cu);
8354 return info_ptr + bytes_read;
8356 info_ptr = skip_one_die (reader, info_ptr + bytes_read, abbrev);
8360 /* Scan the debug information for CU starting at INFO_PTR in buffer BUFFER.
8361 INFO_PTR should point just after the initial uleb128 of a DIE, and the
8362 abbrev corresponding to that skipped uleb128 should be passed in
8363 ABBREV. Returns a pointer to this DIE's sibling, skipping any
8366 static const gdb_byte *
8367 skip_one_die (const struct die_reader_specs *reader, const gdb_byte *info_ptr,
8368 struct abbrev_info *abbrev)
8370 unsigned int bytes_read;
8371 struct attribute attr;
8372 bfd *abfd = reader->abfd;
8373 struct dwarf2_cu *cu = reader->cu;
8374 const gdb_byte *buffer = reader->buffer;
8375 const gdb_byte *buffer_end = reader->buffer_end;
8376 unsigned int form, i;
8378 for (i = 0; i < abbrev->num_attrs; i++)
8380 /* The only abbrev we care about is DW_AT_sibling. */
8381 if (abbrev->attrs[i].name == DW_AT_sibling)
8383 read_attribute (reader, &attr, &abbrev->attrs[i], info_ptr);
8384 if (attr.form == DW_FORM_ref_addr)
8385 complaint (&symfile_complaints,
8386 _("ignoring absolute DW_AT_sibling"));
8389 sect_offset off = dwarf2_get_ref_die_offset (&attr);
8390 const gdb_byte *sibling_ptr = buffer + to_underlying (off);
8392 if (sibling_ptr < info_ptr)
8393 complaint (&symfile_complaints,
8394 _("DW_AT_sibling points backwards"));
8395 else if (sibling_ptr > reader->buffer_end)
8396 dwarf2_section_buffer_overflow_complaint (reader->die_section);
8402 /* If it isn't DW_AT_sibling, skip this attribute. */
8403 form = abbrev->attrs[i].form;
8407 case DW_FORM_ref_addr:
8408 /* In DWARF 2, DW_FORM_ref_addr is address sized; in DWARF 3
8409 and later it is offset sized. */
8410 if (cu->header.version == 2)
8411 info_ptr += cu->header.addr_size;
8413 info_ptr += cu->header.offset_size;
8415 case DW_FORM_GNU_ref_alt:
8416 info_ptr += cu->header.offset_size;
8419 info_ptr += cu->header.addr_size;
8426 case DW_FORM_flag_present:
8427 case DW_FORM_implicit_const:
8439 case DW_FORM_ref_sig8:
8442 case DW_FORM_data16:
8445 case DW_FORM_string:
8446 read_direct_string (abfd, info_ptr, &bytes_read);
8447 info_ptr += bytes_read;
8449 case DW_FORM_sec_offset:
8451 case DW_FORM_GNU_strp_alt:
8452 info_ptr += cu->header.offset_size;
8454 case DW_FORM_exprloc:
8456 info_ptr += read_unsigned_leb128 (abfd, info_ptr, &bytes_read);
8457 info_ptr += bytes_read;
8459 case DW_FORM_block1:
8460 info_ptr += 1 + read_1_byte (abfd, info_ptr);
8462 case DW_FORM_block2:
8463 info_ptr += 2 + read_2_bytes (abfd, info_ptr);
8465 case DW_FORM_block4:
8466 info_ptr += 4 + read_4_bytes (abfd, info_ptr);
8470 case DW_FORM_ref_udata:
8471 case DW_FORM_GNU_addr_index:
8472 case DW_FORM_GNU_str_index:
8473 info_ptr = safe_skip_leb128 (info_ptr, buffer_end);
8475 case DW_FORM_indirect:
8476 form = read_unsigned_leb128 (abfd, info_ptr, &bytes_read);
8477 info_ptr += bytes_read;
8478 /* We need to continue parsing from here, so just go back to
8480 goto skip_attribute;
8483 error (_("Dwarf Error: Cannot handle %s "
8484 "in DWARF reader [in module %s]"),
8485 dwarf_form_name (form),
8486 bfd_get_filename (abfd));
8490 if (abbrev->has_children)
8491 return skip_children (reader, info_ptr);
8496 /* Locate ORIG_PDI's sibling.
8497 INFO_PTR should point to the start of the next DIE after ORIG_PDI. */
8499 static const gdb_byte *
8500 locate_pdi_sibling (const struct die_reader_specs *reader,
8501 struct partial_die_info *orig_pdi,
8502 const gdb_byte *info_ptr)
8504 /* Do we know the sibling already? */
8506 if (orig_pdi->sibling)
8507 return orig_pdi->sibling;
8509 /* Are there any children to deal with? */
8511 if (!orig_pdi->has_children)
8514 /* Skip the children the long way. */
8516 return skip_children (reader, info_ptr);
8519 /* Expand this partial symbol table into a full symbol table. SELF is
8523 dwarf2_read_symtab (struct partial_symtab *self,
8524 struct objfile *objfile)
8528 warning (_("bug: psymtab for %s is already read in."),
8535 printf_filtered (_("Reading in symbols for %s..."),
8537 gdb_flush (gdb_stdout);
8540 /* Restore our global data. */
8542 = (struct dwarf2_per_objfile *) objfile_data (objfile,
8543 dwarf2_objfile_data_key);
8545 /* If this psymtab is constructed from a debug-only objfile, the
8546 has_section_at_zero flag will not necessarily be correct. We
8547 can get the correct value for this flag by looking at the data
8548 associated with the (presumably stripped) associated objfile. */
8549 if (objfile->separate_debug_objfile_backlink)
8551 struct dwarf2_per_objfile *dpo_backlink
8552 = ((struct dwarf2_per_objfile *)
8553 objfile_data (objfile->separate_debug_objfile_backlink,
8554 dwarf2_objfile_data_key));
8556 dwarf2_per_objfile->has_section_at_zero
8557 = dpo_backlink->has_section_at_zero;
8560 dwarf2_per_objfile->reading_partial_symbols = 0;
8562 psymtab_to_symtab_1 (self);
8564 /* Finish up the debug error message. */
8566 printf_filtered (_("done.\n"));
8569 process_cu_includes ();
8572 /* Reading in full CUs. */
8574 /* Add PER_CU to the queue. */
8577 queue_comp_unit (struct dwarf2_per_cu_data *per_cu,
8578 enum language pretend_language)
8580 struct dwarf2_queue_item *item;
8583 item = XNEW (struct dwarf2_queue_item);
8584 item->per_cu = per_cu;
8585 item->pretend_language = pretend_language;
8588 if (dwarf2_queue == NULL)
8589 dwarf2_queue = item;
8591 dwarf2_queue_tail->next = item;
8593 dwarf2_queue_tail = item;
8596 /* If PER_CU is not yet queued, add it to the queue.
8597 If DEPENDENT_CU is non-NULL, it has a reference to PER_CU so add a
8599 The result is non-zero if PER_CU was queued, otherwise the result is zero
8600 meaning either PER_CU is already queued or it is already loaded.
8602 N.B. There is an invariant here that if a CU is queued then it is loaded.
8603 The caller is required to load PER_CU if we return non-zero. */
8606 maybe_queue_comp_unit (struct dwarf2_cu *dependent_cu,
8607 struct dwarf2_per_cu_data *per_cu,
8608 enum language pretend_language)
8610 /* We may arrive here during partial symbol reading, if we need full
8611 DIEs to process an unusual case (e.g. template arguments). Do
8612 not queue PER_CU, just tell our caller to load its DIEs. */
8613 if (dwarf2_per_objfile->reading_partial_symbols)
8615 if (per_cu->cu == NULL || per_cu->cu->dies == NULL)
8620 /* Mark the dependence relation so that we don't flush PER_CU
8622 if (dependent_cu != NULL)
8623 dwarf2_add_dependence (dependent_cu, per_cu);
8625 /* If it's already on the queue, we have nothing to do. */
8629 /* If the compilation unit is already loaded, just mark it as
8631 if (per_cu->cu != NULL)
8633 per_cu->cu->last_used = 0;
8637 /* Add it to the queue. */
8638 queue_comp_unit (per_cu, pretend_language);
8643 /* Process the queue. */
8646 process_queue (void)
8648 struct dwarf2_queue_item *item, *next_item;
8650 if (dwarf_read_debug)
8652 fprintf_unfiltered (gdb_stdlog,
8653 "Expanding one or more symtabs of objfile %s ...\n",
8654 objfile_name (dwarf2_per_objfile->objfile));
8657 /* The queue starts out with one item, but following a DIE reference
8658 may load a new CU, adding it to the end of the queue. */
8659 for (item = dwarf2_queue; item != NULL; dwarf2_queue = item = next_item)
8661 if ((dwarf2_per_objfile->using_index
8662 ? !item->per_cu->v.quick->compunit_symtab
8663 : (item->per_cu->v.psymtab && !item->per_cu->v.psymtab->readin))
8664 /* Skip dummy CUs. */
8665 && item->per_cu->cu != NULL)
8667 struct dwarf2_per_cu_data *per_cu = item->per_cu;
8668 unsigned int debug_print_threshold;
8671 if (per_cu->is_debug_types)
8673 struct signatured_type *sig_type =
8674 (struct signatured_type *) per_cu;
8676 sprintf (buf, "TU %s at offset 0x%x",
8677 hex_string (sig_type->signature),
8678 to_underlying (per_cu->sect_off));
8679 /* There can be 100s of TUs.
8680 Only print them in verbose mode. */
8681 debug_print_threshold = 2;
8685 sprintf (buf, "CU at offset 0x%x",
8686 to_underlying (per_cu->sect_off));
8687 debug_print_threshold = 1;
8690 if (dwarf_read_debug >= debug_print_threshold)
8691 fprintf_unfiltered (gdb_stdlog, "Expanding symtab of %s\n", buf);
8693 if (per_cu->is_debug_types)
8694 process_full_type_unit (per_cu, item->pretend_language);
8696 process_full_comp_unit (per_cu, item->pretend_language);
8698 if (dwarf_read_debug >= debug_print_threshold)
8699 fprintf_unfiltered (gdb_stdlog, "Done expanding %s\n", buf);
8702 item->per_cu->queued = 0;
8703 next_item = item->next;
8707 dwarf2_queue_tail = NULL;
8709 if (dwarf_read_debug)
8711 fprintf_unfiltered (gdb_stdlog, "Done expanding symtabs of %s.\n",
8712 objfile_name (dwarf2_per_objfile->objfile));
8716 /* Free all allocated queue entries. This function only releases anything if
8717 an error was thrown; if the queue was processed then it would have been
8718 freed as we went along. */
8721 dwarf2_release_queue (void *dummy)
8723 struct dwarf2_queue_item *item, *last;
8725 item = dwarf2_queue;
8728 /* Anything still marked queued is likely to be in an
8729 inconsistent state, so discard it. */
8730 if (item->per_cu->queued)
8732 if (item->per_cu->cu != NULL)
8733 free_one_cached_comp_unit (item->per_cu);
8734 item->per_cu->queued = 0;
8742 dwarf2_queue = dwarf2_queue_tail = NULL;
8745 /* Read in full symbols for PST, and anything it depends on. */
8748 psymtab_to_symtab_1 (struct partial_symtab *pst)
8750 struct dwarf2_per_cu_data *per_cu;
8756 for (i = 0; i < pst->number_of_dependencies; i++)
8757 if (!pst->dependencies[i]->readin
8758 && pst->dependencies[i]->user == NULL)
8760 /* Inform about additional files that need to be read in. */
8763 /* FIXME: i18n: Need to make this a single string. */
8764 fputs_filtered (" ", gdb_stdout);
8766 fputs_filtered ("and ", gdb_stdout);
8768 printf_filtered ("%s...", pst->dependencies[i]->filename);
8769 wrap_here (""); /* Flush output. */
8770 gdb_flush (gdb_stdout);
8772 psymtab_to_symtab_1 (pst->dependencies[i]);
8775 per_cu = (struct dwarf2_per_cu_data *) pst->read_symtab_private;
8779 /* It's an include file, no symbols to read for it.
8780 Everything is in the parent symtab. */
8785 dw2_do_instantiate_symtab (per_cu);
8788 /* Trivial hash function for die_info: the hash value of a DIE
8789 is its offset in .debug_info for this objfile. */
8792 die_hash (const void *item)
8794 const struct die_info *die = (const struct die_info *) item;
8796 return to_underlying (die->sect_off);
8799 /* Trivial comparison function for die_info structures: two DIEs
8800 are equal if they have the same offset. */
8803 die_eq (const void *item_lhs, const void *item_rhs)
8805 const struct die_info *die_lhs = (const struct die_info *) item_lhs;
8806 const struct die_info *die_rhs = (const struct die_info *) item_rhs;
8808 return die_lhs->sect_off == die_rhs->sect_off;
8811 /* die_reader_func for load_full_comp_unit.
8812 This is identical to read_signatured_type_reader,
8813 but is kept separate for now. */
8816 load_full_comp_unit_reader (const struct die_reader_specs *reader,
8817 const gdb_byte *info_ptr,
8818 struct die_info *comp_unit_die,
8822 struct dwarf2_cu *cu = reader->cu;
8823 enum language *language_ptr = (enum language *) data;
8825 gdb_assert (cu->die_hash == NULL);
8827 htab_create_alloc_ex (cu->header.length / 12,
8831 &cu->comp_unit_obstack,
8832 hashtab_obstack_allocate,
8833 dummy_obstack_deallocate);
8836 comp_unit_die->child = read_die_and_siblings (reader, info_ptr,
8837 &info_ptr, comp_unit_die);
8838 cu->dies = comp_unit_die;
8839 /* comp_unit_die is not stored in die_hash, no need. */
8841 /* We try not to read any attributes in this function, because not
8842 all CUs needed for references have been loaded yet, and symbol
8843 table processing isn't initialized. But we have to set the CU language,
8844 or we won't be able to build types correctly.
8845 Similarly, if we do not read the producer, we can not apply
8846 producer-specific interpretation. */
8847 prepare_one_comp_unit (cu, cu->dies, *language_ptr);
8850 /* Load the DIEs associated with PER_CU into memory. */
8853 load_full_comp_unit (struct dwarf2_per_cu_data *this_cu,
8854 enum language pretend_language)
8856 gdb_assert (! this_cu->is_debug_types);
8858 init_cutu_and_read_dies (this_cu, NULL, 1, 1,
8859 load_full_comp_unit_reader, &pretend_language);
8862 /* Add a DIE to the delayed physname list. */
8865 add_to_method_list (struct type *type, int fnfield_index, int index,
8866 const char *name, struct die_info *die,
8867 struct dwarf2_cu *cu)
8869 struct delayed_method_info mi;
8871 mi.fnfield_index = fnfield_index;
8875 VEC_safe_push (delayed_method_info, cu->method_list, &mi);
8878 /* A cleanup for freeing the delayed method list. */
8881 free_delayed_list (void *ptr)
8883 struct dwarf2_cu *cu = (struct dwarf2_cu *) ptr;
8884 if (cu->method_list != NULL)
8886 VEC_free (delayed_method_info, cu->method_list);
8887 cu->method_list = NULL;
8891 /* Check whether [PHYSNAME, PHYSNAME+LEN) ends with a modifier like
8892 "const" / "volatile". If so, decrements LEN by the length of the
8893 modifier and return true. Otherwise return false. */
8897 check_modifier (const char *physname, size_t &len, const char (&mod)[N])
8899 size_t mod_len = sizeof (mod) - 1;
8900 if (len > mod_len && startswith (physname + (len - mod_len), mod))
8908 /* Compute the physnames of any methods on the CU's method list.
8910 The computation of method physnames is delayed in order to avoid the
8911 (bad) condition that one of the method's formal parameters is of an as yet
8915 compute_delayed_physnames (struct dwarf2_cu *cu)
8918 struct delayed_method_info *mi;
8920 /* Only C++ delays computing physnames. */
8921 if (VEC_empty (delayed_method_info, cu->method_list))
8923 gdb_assert (cu->language == language_cplus);
8925 for (i = 0; VEC_iterate (delayed_method_info, cu->method_list, i, mi) ; ++i)
8927 const char *physname;
8928 struct fn_fieldlist *fn_flp
8929 = &TYPE_FN_FIELDLIST (mi->type, mi->fnfield_index);
8930 physname = dwarf2_physname (mi->name, mi->die, cu);
8931 TYPE_FN_FIELD_PHYSNAME (fn_flp->fn_fields, mi->index)
8932 = physname ? physname : "";
8934 /* Since there's no tag to indicate whether a method is a
8935 const/volatile overload, extract that information out of the
8937 if (physname != NULL)
8939 size_t len = strlen (physname);
8943 if (physname[len] == ')') /* shortcut */
8945 else if (check_modifier (physname, len, " const"))
8946 TYPE_FN_FIELD_CONST (fn_flp->fn_fields, mi->index) = 1;
8947 else if (check_modifier (physname, len, " volatile"))
8948 TYPE_FN_FIELD_VOLATILE (fn_flp->fn_fields, mi->index) = 1;
8956 /* Go objects should be embedded in a DW_TAG_module DIE,
8957 and it's not clear if/how imported objects will appear.
8958 To keep Go support simple until that's worked out,
8959 go back through what we've read and create something usable.
8960 We could do this while processing each DIE, and feels kinda cleaner,
8961 but that way is more invasive.
8962 This is to, for example, allow the user to type "p var" or "b main"
8963 without having to specify the package name, and allow lookups
8964 of module.object to work in contexts that use the expression
8968 fixup_go_packaging (struct dwarf2_cu *cu)
8970 char *package_name = NULL;
8971 struct pending *list;
8974 for (list = global_symbols; list != NULL; list = list->next)
8976 for (i = 0; i < list->nsyms; ++i)
8978 struct symbol *sym = list->symbol[i];
8980 if (SYMBOL_LANGUAGE (sym) == language_go
8981 && SYMBOL_CLASS (sym) == LOC_BLOCK)
8983 char *this_package_name = go_symbol_package_name (sym);
8985 if (this_package_name == NULL)
8987 if (package_name == NULL)
8988 package_name = this_package_name;
8991 if (strcmp (package_name, this_package_name) != 0)
8992 complaint (&symfile_complaints,
8993 _("Symtab %s has objects from two different Go packages: %s and %s"),
8994 (symbol_symtab (sym) != NULL
8995 ? symtab_to_filename_for_display
8996 (symbol_symtab (sym))
8997 : objfile_name (cu->objfile)),
8998 this_package_name, package_name);
8999 xfree (this_package_name);
9005 if (package_name != NULL)
9007 struct objfile *objfile = cu->objfile;
9008 const char *saved_package_name
9009 = (const char *) obstack_copy0 (&objfile->per_bfd->storage_obstack,
9011 strlen (package_name));
9012 struct type *type = init_type (objfile, TYPE_CODE_MODULE, 0,
9013 saved_package_name);
9016 TYPE_TAG_NAME (type) = TYPE_NAME (type);
9018 sym = allocate_symbol (objfile);
9019 SYMBOL_SET_LANGUAGE (sym, language_go, &objfile->objfile_obstack);
9020 SYMBOL_SET_NAMES (sym, saved_package_name,
9021 strlen (saved_package_name), 0, objfile);
9022 /* This is not VAR_DOMAIN because we want a way to ensure a lookup of,
9023 e.g., "main" finds the "main" module and not C's main(). */
9024 SYMBOL_DOMAIN (sym) = STRUCT_DOMAIN;
9025 SYMBOL_ACLASS_INDEX (sym) = LOC_TYPEDEF;
9026 SYMBOL_TYPE (sym) = type;
9028 add_symbol_to_list (sym, &global_symbols);
9030 xfree (package_name);
9034 /* Return the symtab for PER_CU. This works properly regardless of
9035 whether we're using the index or psymtabs. */
9037 static struct compunit_symtab *
9038 get_compunit_symtab (struct dwarf2_per_cu_data *per_cu)
9040 return (dwarf2_per_objfile->using_index
9041 ? per_cu->v.quick->compunit_symtab
9042 : per_cu->v.psymtab->compunit_symtab);
9045 /* A helper function for computing the list of all symbol tables
9046 included by PER_CU. */
9049 recursively_compute_inclusions (VEC (compunit_symtab_ptr) **result,
9050 htab_t all_children, htab_t all_type_symtabs,
9051 struct dwarf2_per_cu_data *per_cu,
9052 struct compunit_symtab *immediate_parent)
9056 struct compunit_symtab *cust;
9057 struct dwarf2_per_cu_data *iter;
9059 slot = htab_find_slot (all_children, per_cu, INSERT);
9062 /* This inclusion and its children have been processed. */
9067 /* Only add a CU if it has a symbol table. */
9068 cust = get_compunit_symtab (per_cu);
9071 /* If this is a type unit only add its symbol table if we haven't
9072 seen it yet (type unit per_cu's can share symtabs). */
9073 if (per_cu->is_debug_types)
9075 slot = htab_find_slot (all_type_symtabs, cust, INSERT);
9079 VEC_safe_push (compunit_symtab_ptr, *result, cust);
9080 if (cust->user == NULL)
9081 cust->user = immediate_parent;
9086 VEC_safe_push (compunit_symtab_ptr, *result, cust);
9087 if (cust->user == NULL)
9088 cust->user = immediate_parent;
9093 VEC_iterate (dwarf2_per_cu_ptr, per_cu->imported_symtabs, ix, iter);
9096 recursively_compute_inclusions (result, all_children,
9097 all_type_symtabs, iter, cust);
9101 /* Compute the compunit_symtab 'includes' fields for the compunit_symtab of
9105 compute_compunit_symtab_includes (struct dwarf2_per_cu_data *per_cu)
9107 gdb_assert (! per_cu->is_debug_types);
9109 if (!VEC_empty (dwarf2_per_cu_ptr, per_cu->imported_symtabs))
9112 struct dwarf2_per_cu_data *per_cu_iter;
9113 struct compunit_symtab *compunit_symtab_iter;
9114 VEC (compunit_symtab_ptr) *result_symtabs = NULL;
9115 htab_t all_children, all_type_symtabs;
9116 struct compunit_symtab *cust = get_compunit_symtab (per_cu);
9118 /* If we don't have a symtab, we can just skip this case. */
9122 all_children = htab_create_alloc (1, htab_hash_pointer, htab_eq_pointer,
9123 NULL, xcalloc, xfree);
9124 all_type_symtabs = htab_create_alloc (1, htab_hash_pointer, htab_eq_pointer,
9125 NULL, xcalloc, xfree);
9128 VEC_iterate (dwarf2_per_cu_ptr, per_cu->imported_symtabs,
9132 recursively_compute_inclusions (&result_symtabs, all_children,
9133 all_type_symtabs, per_cu_iter,
9137 /* Now we have a transitive closure of all the included symtabs. */
9138 len = VEC_length (compunit_symtab_ptr, result_symtabs);
9140 = XOBNEWVEC (&dwarf2_per_objfile->objfile->objfile_obstack,
9141 struct compunit_symtab *, len + 1);
9143 VEC_iterate (compunit_symtab_ptr, result_symtabs, ix,
9144 compunit_symtab_iter);
9146 cust->includes[ix] = compunit_symtab_iter;
9147 cust->includes[len] = NULL;
9149 VEC_free (compunit_symtab_ptr, result_symtabs);
9150 htab_delete (all_children);
9151 htab_delete (all_type_symtabs);
9155 /* Compute the 'includes' field for the symtabs of all the CUs we just
9159 process_cu_includes (void)
9162 struct dwarf2_per_cu_data *iter;
9165 VEC_iterate (dwarf2_per_cu_ptr, dwarf2_per_objfile->just_read_cus,
9169 if (! iter->is_debug_types)
9170 compute_compunit_symtab_includes (iter);
9173 VEC_free (dwarf2_per_cu_ptr, dwarf2_per_objfile->just_read_cus);
9176 /* Generate full symbol information for PER_CU, whose DIEs have
9177 already been loaded into memory. */
9180 process_full_comp_unit (struct dwarf2_per_cu_data *per_cu,
9181 enum language pretend_language)
9183 struct dwarf2_cu *cu = per_cu->cu;
9184 struct objfile *objfile = per_cu->objfile;
9185 struct gdbarch *gdbarch = get_objfile_arch (objfile);
9186 CORE_ADDR lowpc, highpc;
9187 struct compunit_symtab *cust;
9188 struct cleanup *delayed_list_cleanup;
9190 struct block *static_block;
9193 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
9196 scoped_free_pendings free_pending;
9197 delayed_list_cleanup = make_cleanup (free_delayed_list, cu);
9199 cu->list_in_scope = &file_symbols;
9201 cu->language = pretend_language;
9202 cu->language_defn = language_def (cu->language);
9204 /* Do line number decoding in read_file_scope () */
9205 process_die (cu->dies, cu);
9207 /* For now fudge the Go package. */
9208 if (cu->language == language_go)
9209 fixup_go_packaging (cu);
9211 /* Now that we have processed all the DIEs in the CU, all the types
9212 should be complete, and it should now be safe to compute all of the
9214 compute_delayed_physnames (cu);
9215 do_cleanups (delayed_list_cleanup);
9217 /* Some compilers don't define a DW_AT_high_pc attribute for the
9218 compilation unit. If the DW_AT_high_pc is missing, synthesize
9219 it, by scanning the DIE's below the compilation unit. */
9220 get_scope_pc_bounds (cu->dies, &lowpc, &highpc, cu);
9222 addr = gdbarch_adjust_dwarf2_addr (gdbarch, highpc + baseaddr);
9223 static_block = end_symtab_get_static_block (addr, 0, 1);
9225 /* If the comp unit has DW_AT_ranges, it may have discontiguous ranges.
9226 Also, DW_AT_ranges may record ranges not belonging to any child DIEs
9227 (such as virtual method tables). Record the ranges in STATIC_BLOCK's
9228 addrmap to help ensure it has an accurate map of pc values belonging to
9230 dwarf2_record_block_ranges (cu->dies, static_block, baseaddr, cu);
9232 cust = end_symtab_from_static_block (static_block,
9233 SECT_OFF_TEXT (objfile), 0);
9237 int gcc_4_minor = producer_is_gcc_ge_4 (cu->producer);
9239 /* Set symtab language to language from DW_AT_language. If the
9240 compilation is from a C file generated by language preprocessors, do
9241 not set the language if it was already deduced by start_subfile. */
9242 if (!(cu->language == language_c
9243 && COMPUNIT_FILETABS (cust)->language != language_unknown))
9244 COMPUNIT_FILETABS (cust)->language = cu->language;
9246 /* GCC-4.0 has started to support -fvar-tracking. GCC-3.x still can
9247 produce DW_AT_location with location lists but it can be possibly
9248 invalid without -fvar-tracking. Still up to GCC-4.4.x incl. 4.4.0
9249 there were bugs in prologue debug info, fixed later in GCC-4.5
9250 by "unwind info for epilogues" patch (which is not directly related).
9252 For -gdwarf-4 type units LOCATIONS_VALID indication is fortunately not
9253 needed, it would be wrong due to missing DW_AT_producer there.
9255 Still one can confuse GDB by using non-standard GCC compilation
9256 options - this waits on GCC PR other/32998 (-frecord-gcc-switches).
9258 if (cu->has_loclist && gcc_4_minor >= 5)
9259 cust->locations_valid = 1;
9261 if (gcc_4_minor >= 5)
9262 cust->epilogue_unwind_valid = 1;
9264 cust->call_site_htab = cu->call_site_htab;
9267 if (dwarf2_per_objfile->using_index)
9268 per_cu->v.quick->compunit_symtab = cust;
9271 struct partial_symtab *pst = per_cu->v.psymtab;
9272 pst->compunit_symtab = cust;
9276 /* Push it for inclusion processing later. */
9277 VEC_safe_push (dwarf2_per_cu_ptr, dwarf2_per_objfile->just_read_cus, per_cu);
9280 /* Generate full symbol information for type unit PER_CU, whose DIEs have
9281 already been loaded into memory. */
9284 process_full_type_unit (struct dwarf2_per_cu_data *per_cu,
9285 enum language pretend_language)
9287 struct dwarf2_cu *cu = per_cu->cu;
9288 struct objfile *objfile = per_cu->objfile;
9289 struct compunit_symtab *cust;
9290 struct cleanup *delayed_list_cleanup;
9291 struct signatured_type *sig_type;
9293 gdb_assert (per_cu->is_debug_types);
9294 sig_type = (struct signatured_type *) per_cu;
9297 scoped_free_pendings free_pending;
9298 delayed_list_cleanup = make_cleanup (free_delayed_list, cu);
9300 cu->list_in_scope = &file_symbols;
9302 cu->language = pretend_language;
9303 cu->language_defn = language_def (cu->language);
9305 /* The symbol tables are set up in read_type_unit_scope. */
9306 process_die (cu->dies, cu);
9308 /* For now fudge the Go package. */
9309 if (cu->language == language_go)
9310 fixup_go_packaging (cu);
9312 /* Now that we have processed all the DIEs in the CU, all the types
9313 should be complete, and it should now be safe to compute all of the
9315 compute_delayed_physnames (cu);
9316 do_cleanups (delayed_list_cleanup);
9318 /* TUs share symbol tables.
9319 If this is the first TU to use this symtab, complete the construction
9320 of it with end_expandable_symtab. Otherwise, complete the addition of
9321 this TU's symbols to the existing symtab. */
9322 if (sig_type->type_unit_group->compunit_symtab == NULL)
9324 cust = end_expandable_symtab (0, SECT_OFF_TEXT (objfile));
9325 sig_type->type_unit_group->compunit_symtab = cust;
9329 /* Set symtab language to language from DW_AT_language. If the
9330 compilation is from a C file generated by language preprocessors,
9331 do not set the language if it was already deduced by
9333 if (!(cu->language == language_c
9334 && COMPUNIT_FILETABS (cust)->language != language_c))
9335 COMPUNIT_FILETABS (cust)->language = cu->language;
9340 augment_type_symtab ();
9341 cust = sig_type->type_unit_group->compunit_symtab;
9344 if (dwarf2_per_objfile->using_index)
9345 per_cu->v.quick->compunit_symtab = cust;
9348 struct partial_symtab *pst = per_cu->v.psymtab;
9349 pst->compunit_symtab = cust;
9354 /* Process an imported unit DIE. */
9357 process_imported_unit_die (struct die_info *die, struct dwarf2_cu *cu)
9359 struct attribute *attr;
9361 /* For now we don't handle imported units in type units. */
9362 if (cu->per_cu->is_debug_types)
9364 error (_("Dwarf Error: DW_TAG_imported_unit is not"
9365 " supported in type units [in module %s]"),
9366 objfile_name (cu->objfile));
9369 attr = dwarf2_attr (die, DW_AT_import, cu);
9372 sect_offset sect_off = dwarf2_get_ref_die_offset (attr);
9373 bool is_dwz = (attr->form == DW_FORM_GNU_ref_alt || cu->per_cu->is_dwz);
9374 dwarf2_per_cu_data *per_cu
9375 = dwarf2_find_containing_comp_unit (sect_off, is_dwz, cu->objfile);
9377 /* If necessary, add it to the queue and load its DIEs. */
9378 if (maybe_queue_comp_unit (cu, per_cu, cu->language))
9379 load_full_comp_unit (per_cu, cu->language);
9381 VEC_safe_push (dwarf2_per_cu_ptr, cu->per_cu->imported_symtabs,
9386 /* RAII object that represents a process_die scope: i.e.,
9387 starts/finishes processing a DIE. */
9388 class process_die_scope
9391 process_die_scope (die_info *die, dwarf2_cu *cu)
9392 : m_die (die), m_cu (cu)
9394 /* We should only be processing DIEs not already in process. */
9395 gdb_assert (!m_die->in_process);
9396 m_die->in_process = true;
9399 ~process_die_scope ()
9401 m_die->in_process = false;
9403 /* If we're done processing the DIE for the CU that owns the line
9404 header, we don't need the line header anymore. */
9405 if (m_cu->line_header_die_owner == m_die)
9407 delete m_cu->line_header;
9408 m_cu->line_header = NULL;
9409 m_cu->line_header_die_owner = NULL;
9418 /* Process a die and its children. */
9421 process_die (struct die_info *die, struct dwarf2_cu *cu)
9423 process_die_scope scope (die, cu);
9427 case DW_TAG_padding:
9429 case DW_TAG_compile_unit:
9430 case DW_TAG_partial_unit:
9431 read_file_scope (die, cu);
9433 case DW_TAG_type_unit:
9434 read_type_unit_scope (die, cu);
9436 case DW_TAG_subprogram:
9437 case DW_TAG_inlined_subroutine:
9438 read_func_scope (die, cu);
9440 case DW_TAG_lexical_block:
9441 case DW_TAG_try_block:
9442 case DW_TAG_catch_block:
9443 read_lexical_block_scope (die, cu);
9445 case DW_TAG_call_site:
9446 case DW_TAG_GNU_call_site:
9447 read_call_site_scope (die, cu);
9449 case DW_TAG_class_type:
9450 case DW_TAG_interface_type:
9451 case DW_TAG_structure_type:
9452 case DW_TAG_union_type:
9453 process_structure_scope (die, cu);
9455 case DW_TAG_enumeration_type:
9456 process_enumeration_scope (die, cu);
9459 /* These dies have a type, but processing them does not create
9460 a symbol or recurse to process the children. Therefore we can
9461 read them on-demand through read_type_die. */
9462 case DW_TAG_subroutine_type:
9463 case DW_TAG_set_type:
9464 case DW_TAG_array_type:
9465 case DW_TAG_pointer_type:
9466 case DW_TAG_ptr_to_member_type:
9467 case DW_TAG_reference_type:
9468 case DW_TAG_rvalue_reference_type:
9469 case DW_TAG_string_type:
9472 case DW_TAG_base_type:
9473 case DW_TAG_subrange_type:
9474 case DW_TAG_typedef:
9475 /* Add a typedef symbol for the type definition, if it has a
9477 new_symbol (die, read_type_die (die, cu), cu);
9479 case DW_TAG_common_block:
9480 read_common_block (die, cu);
9482 case DW_TAG_common_inclusion:
9484 case DW_TAG_namespace:
9485 cu->processing_has_namespace_info = 1;
9486 read_namespace (die, cu);
9489 cu->processing_has_namespace_info = 1;
9490 read_module (die, cu);
9492 case DW_TAG_imported_declaration:
9493 cu->processing_has_namespace_info = 1;
9494 if (read_namespace_alias (die, cu))
9496 /* The declaration is not a global namespace alias: fall through. */
9497 case DW_TAG_imported_module:
9498 cu->processing_has_namespace_info = 1;
9499 if (die->child != NULL && (die->tag == DW_TAG_imported_declaration
9500 || cu->language != language_fortran))
9501 complaint (&symfile_complaints, _("Tag '%s' has unexpected children"),
9502 dwarf_tag_name (die->tag));
9503 read_import_statement (die, cu);
9506 case DW_TAG_imported_unit:
9507 process_imported_unit_die (die, cu);
9510 case DW_TAG_variable:
9511 read_variable (die, cu);
9515 new_symbol (die, NULL, cu);
9520 /* DWARF name computation. */
9522 /* A helper function for dwarf2_compute_name which determines whether DIE
9523 needs to have the name of the scope prepended to the name listed in the
9527 die_needs_namespace (struct die_info *die, struct dwarf2_cu *cu)
9529 struct attribute *attr;
9533 case DW_TAG_namespace:
9534 case DW_TAG_typedef:
9535 case DW_TAG_class_type:
9536 case DW_TAG_interface_type:
9537 case DW_TAG_structure_type:
9538 case DW_TAG_union_type:
9539 case DW_TAG_enumeration_type:
9540 case DW_TAG_enumerator:
9541 case DW_TAG_subprogram:
9542 case DW_TAG_inlined_subroutine:
9544 case DW_TAG_imported_declaration:
9547 case DW_TAG_variable:
9548 case DW_TAG_constant:
9549 /* We only need to prefix "globally" visible variables. These include
9550 any variable marked with DW_AT_external or any variable that
9551 lives in a namespace. [Variables in anonymous namespaces
9552 require prefixing, but they are not DW_AT_external.] */
9554 if (dwarf2_attr (die, DW_AT_specification, cu))
9556 struct dwarf2_cu *spec_cu = cu;
9558 return die_needs_namespace (die_specification (die, &spec_cu),
9562 attr = dwarf2_attr (die, DW_AT_external, cu);
9563 if (attr == NULL && die->parent->tag != DW_TAG_namespace
9564 && die->parent->tag != DW_TAG_module)
9566 /* A variable in a lexical block of some kind does not need a
9567 namespace, even though in C++ such variables may be external
9568 and have a mangled name. */
9569 if (die->parent->tag == DW_TAG_lexical_block
9570 || die->parent->tag == DW_TAG_try_block
9571 || die->parent->tag == DW_TAG_catch_block
9572 || die->parent->tag == DW_TAG_subprogram)
9581 /* Return the DIE's linkage name attribute, either DW_AT_linkage_name
9582 or DW_AT_MIPS_linkage_name. Returns NULL if the attribute is not
9583 defined for the given DIE. */
9585 static struct attribute *
9586 dw2_linkage_name_attr (struct die_info *die, struct dwarf2_cu *cu)
9588 struct attribute *attr;
9590 attr = dwarf2_attr (die, DW_AT_linkage_name, cu);
9592 attr = dwarf2_attr (die, DW_AT_MIPS_linkage_name, cu);
9597 /* Return the DIE's linkage name as a string, either DW_AT_linkage_name
9598 or DW_AT_MIPS_linkage_name. Returns NULL if the attribute is not
9599 defined for the given DIE. */
9602 dw2_linkage_name (struct die_info *die, struct dwarf2_cu *cu)
9604 const char *linkage_name;
9606 linkage_name = dwarf2_string_attr (die, DW_AT_linkage_name, cu);
9607 if (linkage_name == NULL)
9608 linkage_name = dwarf2_string_attr (die, DW_AT_MIPS_linkage_name, cu);
9610 return linkage_name;
9613 /* Compute the fully qualified name of DIE in CU. If PHYSNAME is nonzero,
9614 compute the physname for the object, which include a method's:
9615 - formal parameters (C++),
9616 - receiver type (Go),
9618 The term "physname" is a bit confusing.
9619 For C++, for example, it is the demangled name.
9620 For Go, for example, it's the mangled name.
9622 For Ada, return the DIE's linkage name rather than the fully qualified
9623 name. PHYSNAME is ignored..
9625 The result is allocated on the objfile_obstack and canonicalized. */
9628 dwarf2_compute_name (const char *name,
9629 struct die_info *die, struct dwarf2_cu *cu,
9632 struct objfile *objfile = cu->objfile;
9635 name = dwarf2_name (die, cu);
9637 /* For Fortran GDB prefers DW_AT_*linkage_name for the physname if present
9638 but otherwise compute it by typename_concat inside GDB.
9639 FIXME: Actually this is not really true, or at least not always true.
9640 It's all very confusing. SYMBOL_SET_NAMES doesn't try to demangle
9641 Fortran names because there is no mangling standard. So new_symbol_full
9642 will set the demangled name to the result of dwarf2_full_name, and it is
9643 the demangled name that GDB uses if it exists. */
9644 if (cu->language == language_ada
9645 || (cu->language == language_fortran && physname))
9647 /* For Ada unit, we prefer the linkage name over the name, as
9648 the former contains the exported name, which the user expects
9649 to be able to reference. Ideally, we want the user to be able
9650 to reference this entity using either natural or linkage name,
9651 but we haven't started looking at this enhancement yet. */
9652 const char *linkage_name = dw2_linkage_name (die, cu);
9654 if (linkage_name != NULL)
9655 return linkage_name;
9658 /* These are the only languages we know how to qualify names in. */
9660 && (cu->language == language_cplus
9661 || cu->language == language_fortran || cu->language == language_d
9662 || cu->language == language_rust))
9664 if (die_needs_namespace (die, cu))
9668 const char *canonical_name = NULL;
9672 prefix = determine_prefix (die, cu);
9673 if (*prefix != '\0')
9675 char *prefixed_name = typename_concat (NULL, prefix, name,
9678 buf.puts (prefixed_name);
9679 xfree (prefixed_name);
9684 /* Template parameters may be specified in the DIE's DW_AT_name, or
9685 as children with DW_TAG_template_type_param or
9686 DW_TAG_value_type_param. If the latter, add them to the name
9687 here. If the name already has template parameters, then
9688 skip this step; some versions of GCC emit both, and
9689 it is more efficient to use the pre-computed name.
9691 Something to keep in mind about this process: it is very
9692 unlikely, or in some cases downright impossible, to produce
9693 something that will match the mangled name of a function.
9694 If the definition of the function has the same debug info,
9695 we should be able to match up with it anyway. But fallbacks
9696 using the minimal symbol, for instance to find a method
9697 implemented in a stripped copy of libstdc++, will not work.
9698 If we do not have debug info for the definition, we will have to
9699 match them up some other way.
9701 When we do name matching there is a related problem with function
9702 templates; two instantiated function templates are allowed to
9703 differ only by their return types, which we do not add here. */
9705 if (cu->language == language_cplus && strchr (name, '<') == NULL)
9707 struct attribute *attr;
9708 struct die_info *child;
9711 die->building_fullname = 1;
9713 for (child = die->child; child != NULL; child = child->sibling)
9717 const gdb_byte *bytes;
9718 struct dwarf2_locexpr_baton *baton;
9721 if (child->tag != DW_TAG_template_type_param
9722 && child->tag != DW_TAG_template_value_param)
9733 attr = dwarf2_attr (child, DW_AT_type, cu);
9736 complaint (&symfile_complaints,
9737 _("template parameter missing DW_AT_type"));
9738 buf.puts ("UNKNOWN_TYPE");
9741 type = die_type (child, cu);
9743 if (child->tag == DW_TAG_template_type_param)
9745 c_print_type (type, "", &buf, -1, 0, &type_print_raw_options);
9749 attr = dwarf2_attr (child, DW_AT_const_value, cu);
9752 complaint (&symfile_complaints,
9753 _("template parameter missing "
9754 "DW_AT_const_value"));
9755 buf.puts ("UNKNOWN_VALUE");
9759 dwarf2_const_value_attr (attr, type, name,
9760 &cu->comp_unit_obstack, cu,
9761 &value, &bytes, &baton);
9763 if (TYPE_NOSIGN (type))
9764 /* GDB prints characters as NUMBER 'CHAR'. If that's
9765 changed, this can use value_print instead. */
9766 c_printchar (value, type, &buf);
9769 struct value_print_options opts;
9772 v = dwarf2_evaluate_loc_desc (type, NULL,
9776 else if (bytes != NULL)
9778 v = allocate_value (type);
9779 memcpy (value_contents_writeable (v), bytes,
9780 TYPE_LENGTH (type));
9783 v = value_from_longest (type, value);
9785 /* Specify decimal so that we do not depend on
9787 get_formatted_print_options (&opts, 'd');
9789 value_print (v, &buf, &opts);
9795 die->building_fullname = 0;
9799 /* Close the argument list, with a space if necessary
9800 (nested templates). */
9801 if (!buf.empty () && buf.string ().back () == '>')
9808 /* For C++ methods, append formal parameter type
9809 information, if PHYSNAME. */
9811 if (physname && die->tag == DW_TAG_subprogram
9812 && cu->language == language_cplus)
9814 struct type *type = read_type_die (die, cu);
9816 c_type_print_args (type, &buf, 1, cu->language,
9817 &type_print_raw_options);
9819 if (cu->language == language_cplus)
9821 /* Assume that an artificial first parameter is
9822 "this", but do not crash if it is not. RealView
9823 marks unnamed (and thus unused) parameters as
9824 artificial; there is no way to differentiate
9826 if (TYPE_NFIELDS (type) > 0
9827 && TYPE_FIELD_ARTIFICIAL (type, 0)
9828 && TYPE_CODE (TYPE_FIELD_TYPE (type, 0)) == TYPE_CODE_PTR
9829 && TYPE_CONST (TYPE_TARGET_TYPE (TYPE_FIELD_TYPE (type,
9831 buf.puts (" const");
9835 const std::string &intermediate_name = buf.string ();
9837 if (cu->language == language_cplus)
9839 = dwarf2_canonicalize_name (intermediate_name.c_str (), cu,
9840 &objfile->per_bfd->storage_obstack);
9842 /* If we only computed INTERMEDIATE_NAME, or if
9843 INTERMEDIATE_NAME is already canonical, then we need to
9844 copy it to the appropriate obstack. */
9845 if (canonical_name == NULL || canonical_name == intermediate_name.c_str ())
9846 name = ((const char *)
9847 obstack_copy0 (&objfile->per_bfd->storage_obstack,
9848 intermediate_name.c_str (),
9849 intermediate_name.length ()));
9851 name = canonical_name;
9858 /* Return the fully qualified name of DIE, based on its DW_AT_name.
9859 If scope qualifiers are appropriate they will be added. The result
9860 will be allocated on the storage_obstack, or NULL if the DIE does
9861 not have a name. NAME may either be from a previous call to
9862 dwarf2_name or NULL.
9864 The output string will be canonicalized (if C++). */
9867 dwarf2_full_name (const char *name, struct die_info *die, struct dwarf2_cu *cu)
9869 return dwarf2_compute_name (name, die, cu, 0);
9872 /* Construct a physname for the given DIE in CU. NAME may either be
9873 from a previous call to dwarf2_name or NULL. The result will be
9874 allocated on the objfile_objstack or NULL if the DIE does not have a
9877 The output string will be canonicalized (if C++). */
9880 dwarf2_physname (const char *name, struct die_info *die, struct dwarf2_cu *cu)
9882 struct objfile *objfile = cu->objfile;
9883 const char *retval, *mangled = NULL, *canon = NULL;
9886 /* In this case dwarf2_compute_name is just a shortcut not building anything
9888 if (!die_needs_namespace (die, cu))
9889 return dwarf2_compute_name (name, die, cu, 1);
9891 mangled = dw2_linkage_name (die, cu);
9893 /* rustc emits invalid values for DW_AT_linkage_name. Ignore these.
9894 See https://github.com/rust-lang/rust/issues/32925. */
9895 if (cu->language == language_rust && mangled != NULL
9896 && strchr (mangled, '{') != NULL)
9899 /* DW_AT_linkage_name is missing in some cases - depend on what GDB
9901 gdb::unique_xmalloc_ptr<char> demangled;
9902 if (mangled != NULL)
9904 /* Use DMGL_RET_DROP for C++ template functions to suppress their return
9905 type. It is easier for GDB users to search for such functions as
9906 `name(params)' than `long name(params)'. In such case the minimal
9907 symbol names do not match the full symbol names but for template
9908 functions there is never a need to look up their definition from their
9909 declaration so the only disadvantage remains the minimal symbol
9910 variant `long name(params)' does not have the proper inferior type.
9913 if (cu->language == language_go)
9915 /* This is a lie, but we already lie to the caller new_symbol_full.
9916 new_symbol_full assumes we return the mangled name.
9917 This just undoes that lie until things are cleaned up. */
9921 demangled.reset (gdb_demangle (mangled,
9922 (DMGL_PARAMS | DMGL_ANSI
9926 canon = demangled.get ();
9934 if (canon == NULL || check_physname)
9936 const char *physname = dwarf2_compute_name (name, die, cu, 1);
9938 if (canon != NULL && strcmp (physname, canon) != 0)
9940 /* It may not mean a bug in GDB. The compiler could also
9941 compute DW_AT_linkage_name incorrectly. But in such case
9942 GDB would need to be bug-to-bug compatible. */
9944 complaint (&symfile_complaints,
9945 _("Computed physname <%s> does not match demangled <%s> "
9946 "(from linkage <%s>) - DIE at 0x%x [in module %s]"),
9947 physname, canon, mangled, to_underlying (die->sect_off),
9948 objfile_name (objfile));
9950 /* Prefer DW_AT_linkage_name (in the CANON form) - when it
9951 is available here - over computed PHYSNAME. It is safer
9952 against both buggy GDB and buggy compilers. */
9966 retval = ((const char *)
9967 obstack_copy0 (&objfile->per_bfd->storage_obstack,
9968 retval, strlen (retval)));
9973 /* Inspect DIE in CU for a namespace alias. If one exists, record
9974 a new symbol for it.
9976 Returns 1 if a namespace alias was recorded, 0 otherwise. */
9979 read_namespace_alias (struct die_info *die, struct dwarf2_cu *cu)
9981 struct attribute *attr;
9983 /* If the die does not have a name, this is not a namespace
9985 attr = dwarf2_attr (die, DW_AT_name, cu);
9989 struct die_info *d = die;
9990 struct dwarf2_cu *imported_cu = cu;
9992 /* If the compiler has nested DW_AT_imported_declaration DIEs,
9993 keep inspecting DIEs until we hit the underlying import. */
9994 #define MAX_NESTED_IMPORTED_DECLARATIONS 100
9995 for (num = 0; num < MAX_NESTED_IMPORTED_DECLARATIONS; ++num)
9997 attr = dwarf2_attr (d, DW_AT_import, cu);
10001 d = follow_die_ref (d, attr, &imported_cu);
10002 if (d->tag != DW_TAG_imported_declaration)
10006 if (num == MAX_NESTED_IMPORTED_DECLARATIONS)
10008 complaint (&symfile_complaints,
10009 _("DIE at 0x%x has too many recursively imported "
10010 "declarations"), to_underlying (d->sect_off));
10017 sect_offset sect_off = dwarf2_get_ref_die_offset (attr);
10019 type = get_die_type_at_offset (sect_off, cu->per_cu);
10020 if (type != NULL && TYPE_CODE (type) == TYPE_CODE_NAMESPACE)
10022 /* This declaration is a global namespace alias. Add
10023 a symbol for it whose type is the aliased namespace. */
10024 new_symbol (die, type, cu);
10033 /* Return the using directives repository (global or local?) to use in the
10034 current context for LANGUAGE.
10036 For Ada, imported declarations can materialize renamings, which *may* be
10037 global. However it is impossible (for now?) in DWARF to distinguish
10038 "external" imported declarations and "static" ones. As all imported
10039 declarations seem to be static in all other languages, make them all CU-wide
10040 global only in Ada. */
10042 static struct using_direct **
10043 using_directives (enum language language)
10045 if (language == language_ada && context_stack_depth == 0)
10046 return &global_using_directives;
10048 return &local_using_directives;
10051 /* Read the import statement specified by the given die and record it. */
10054 read_import_statement (struct die_info *die, struct dwarf2_cu *cu)
10056 struct objfile *objfile = cu->objfile;
10057 struct attribute *import_attr;
10058 struct die_info *imported_die, *child_die;
10059 struct dwarf2_cu *imported_cu;
10060 const char *imported_name;
10061 const char *imported_name_prefix;
10062 const char *canonical_name;
10063 const char *import_alias;
10064 const char *imported_declaration = NULL;
10065 const char *import_prefix;
10066 std::vector<const char *> excludes;
10068 import_attr = dwarf2_attr (die, DW_AT_import, cu);
10069 if (import_attr == NULL)
10071 complaint (&symfile_complaints, _("Tag '%s' has no DW_AT_import"),
10072 dwarf_tag_name (die->tag));
10077 imported_die = follow_die_ref_or_sig (die, import_attr, &imported_cu);
10078 imported_name = dwarf2_name (imported_die, imported_cu);
10079 if (imported_name == NULL)
10081 /* GCC bug: https://bugzilla.redhat.com/show_bug.cgi?id=506524
10083 The import in the following code:
10097 <2><51>: Abbrev Number: 3 (DW_TAG_imported_declaration)
10098 <52> DW_AT_decl_file : 1
10099 <53> DW_AT_decl_line : 6
10100 <54> DW_AT_import : <0x75>
10101 <2><58>: Abbrev Number: 4 (DW_TAG_typedef)
10102 <59> DW_AT_name : B
10103 <5b> DW_AT_decl_file : 1
10104 <5c> DW_AT_decl_line : 2
10105 <5d> DW_AT_type : <0x6e>
10107 <1><75>: Abbrev Number: 7 (DW_TAG_base_type)
10108 <76> DW_AT_byte_size : 4
10109 <77> DW_AT_encoding : 5 (signed)
10111 imports the wrong die ( 0x75 instead of 0x58 ).
10112 This case will be ignored until the gcc bug is fixed. */
10116 /* Figure out the local name after import. */
10117 import_alias = dwarf2_name (die, cu);
10119 /* Figure out where the statement is being imported to. */
10120 import_prefix = determine_prefix (die, cu);
10122 /* Figure out what the scope of the imported die is and prepend it
10123 to the name of the imported die. */
10124 imported_name_prefix = determine_prefix (imported_die, imported_cu);
10126 if (imported_die->tag != DW_TAG_namespace
10127 && imported_die->tag != DW_TAG_module)
10129 imported_declaration = imported_name;
10130 canonical_name = imported_name_prefix;
10132 else if (strlen (imported_name_prefix) > 0)
10133 canonical_name = obconcat (&objfile->objfile_obstack,
10134 imported_name_prefix,
10135 (cu->language == language_d ? "." : "::"),
10136 imported_name, (char *) NULL);
10138 canonical_name = imported_name;
10140 if (die->tag == DW_TAG_imported_module && cu->language == language_fortran)
10141 for (child_die = die->child; child_die && child_die->tag;
10142 child_die = sibling_die (child_die))
10144 /* DWARF-4: A Fortran use statement with a “rename list” may be
10145 represented by an imported module entry with an import attribute
10146 referring to the module and owned entries corresponding to those
10147 entities that are renamed as part of being imported. */
10149 if (child_die->tag != DW_TAG_imported_declaration)
10151 complaint (&symfile_complaints,
10152 _("child DW_TAG_imported_declaration expected "
10153 "- DIE at 0x%x [in module %s]"),
10154 to_underlying (child_die->sect_off), objfile_name (objfile));
10158 import_attr = dwarf2_attr (child_die, DW_AT_import, cu);
10159 if (import_attr == NULL)
10161 complaint (&symfile_complaints, _("Tag '%s' has no DW_AT_import"),
10162 dwarf_tag_name (child_die->tag));
10167 imported_die = follow_die_ref_or_sig (child_die, import_attr,
10169 imported_name = dwarf2_name (imported_die, imported_cu);
10170 if (imported_name == NULL)
10172 complaint (&symfile_complaints,
10173 _("child DW_TAG_imported_declaration has unknown "
10174 "imported name - DIE at 0x%x [in module %s]"),
10175 to_underlying (child_die->sect_off), objfile_name (objfile));
10179 excludes.push_back (imported_name);
10181 process_die (child_die, cu);
10184 add_using_directive (using_directives (cu->language),
10188 imported_declaration,
10191 &objfile->objfile_obstack);
10194 /* ICC<14 does not output the required DW_AT_declaration on incomplete
10195 types, but gives them a size of zero. Starting with version 14,
10196 ICC is compatible with GCC. */
10199 producer_is_icc_lt_14 (struct dwarf2_cu *cu)
10201 if (!cu->checked_producer)
10202 check_producer (cu);
10204 return cu->producer_is_icc_lt_14;
10207 /* Check for possibly missing DW_AT_comp_dir with relative .debug_line
10208 directory paths. GCC SVN r127613 (new option -fdebug-prefix-map) fixed
10209 this, it was first present in GCC release 4.3.0. */
10212 producer_is_gcc_lt_4_3 (struct dwarf2_cu *cu)
10214 if (!cu->checked_producer)
10215 check_producer (cu);
10217 return cu->producer_is_gcc_lt_4_3;
10220 static file_and_directory
10221 find_file_and_directory (struct die_info *die, struct dwarf2_cu *cu)
10223 file_and_directory res;
10225 /* Find the filename. Do not use dwarf2_name here, since the filename
10226 is not a source language identifier. */
10227 res.name = dwarf2_string_attr (die, DW_AT_name, cu);
10228 res.comp_dir = dwarf2_string_attr (die, DW_AT_comp_dir, cu);
10230 if (res.comp_dir == NULL
10231 && producer_is_gcc_lt_4_3 (cu) && res.name != NULL
10232 && IS_ABSOLUTE_PATH (res.name))
10234 res.comp_dir_storage = ldirname (res.name);
10235 if (!res.comp_dir_storage.empty ())
10236 res.comp_dir = res.comp_dir_storage.c_str ();
10238 if (res.comp_dir != NULL)
10240 /* Irix 6.2 native cc prepends <machine>.: to the compilation
10241 directory, get rid of it. */
10242 const char *cp = strchr (res.comp_dir, ':');
10244 if (cp && cp != res.comp_dir && cp[-1] == '.' && cp[1] == '/')
10245 res.comp_dir = cp + 1;
10248 if (res.name == NULL)
10249 res.name = "<unknown>";
10254 /* Handle DW_AT_stmt_list for a compilation unit.
10255 DIE is the DW_TAG_compile_unit die for CU.
10256 COMP_DIR is the compilation directory. LOWPC is passed to
10257 dwarf_decode_lines. See dwarf_decode_lines comments about it. */
10260 handle_DW_AT_stmt_list (struct die_info *die, struct dwarf2_cu *cu,
10261 const char *comp_dir, CORE_ADDR lowpc) /* ARI: editCase function */
10263 struct objfile *objfile = dwarf2_per_objfile->objfile;
10264 struct attribute *attr;
10265 struct line_header line_header_local;
10266 hashval_t line_header_local_hash;
10269 int decode_mapping;
10271 gdb_assert (! cu->per_cu->is_debug_types);
10273 attr = dwarf2_attr (die, DW_AT_stmt_list, cu);
10277 sect_offset line_offset = (sect_offset) DW_UNSND (attr);
10279 /* The line header hash table is only created if needed (it exists to
10280 prevent redundant reading of the line table for partial_units).
10281 If we're given a partial_unit, we'll need it. If we're given a
10282 compile_unit, then use the line header hash table if it's already
10283 created, but don't create one just yet. */
10285 if (dwarf2_per_objfile->line_header_hash == NULL
10286 && die->tag == DW_TAG_partial_unit)
10288 dwarf2_per_objfile->line_header_hash
10289 = htab_create_alloc_ex (127, line_header_hash_voidp,
10290 line_header_eq_voidp,
10291 free_line_header_voidp,
10292 &objfile->objfile_obstack,
10293 hashtab_obstack_allocate,
10294 dummy_obstack_deallocate);
10297 line_header_local.sect_off = line_offset;
10298 line_header_local.offset_in_dwz = cu->per_cu->is_dwz;
10299 line_header_local_hash = line_header_hash (&line_header_local);
10300 if (dwarf2_per_objfile->line_header_hash != NULL)
10302 slot = htab_find_slot_with_hash (dwarf2_per_objfile->line_header_hash,
10303 &line_header_local,
10304 line_header_local_hash, NO_INSERT);
10306 /* For DW_TAG_compile_unit we need info like symtab::linetable which
10307 is not present in *SLOT (since if there is something in *SLOT then
10308 it will be for a partial_unit). */
10309 if (die->tag == DW_TAG_partial_unit && slot != NULL)
10311 gdb_assert (*slot != NULL);
10312 cu->line_header = (struct line_header *) *slot;
10317 /* dwarf_decode_line_header does not yet provide sufficient information.
10318 We always have to call also dwarf_decode_lines for it. */
10319 line_header_up lh = dwarf_decode_line_header (line_offset, cu);
10323 cu->line_header = lh.release ();
10324 cu->line_header_die_owner = die;
10326 if (dwarf2_per_objfile->line_header_hash == NULL)
10330 slot = htab_find_slot_with_hash (dwarf2_per_objfile->line_header_hash,
10331 &line_header_local,
10332 line_header_local_hash, INSERT);
10333 gdb_assert (slot != NULL);
10335 if (slot != NULL && *slot == NULL)
10337 /* This newly decoded line number information unit will be owned
10338 by line_header_hash hash table. */
10339 *slot = cu->line_header;
10340 cu->line_header_die_owner = NULL;
10344 /* We cannot free any current entry in (*slot) as that struct line_header
10345 may be already used by multiple CUs. Create only temporary decoded
10346 line_header for this CU - it may happen at most once for each line
10347 number information unit. And if we're not using line_header_hash
10348 then this is what we want as well. */
10349 gdb_assert (die->tag != DW_TAG_partial_unit);
10351 decode_mapping = (die->tag != DW_TAG_partial_unit);
10352 dwarf_decode_lines (cu->line_header, comp_dir, cu, NULL, lowpc,
10357 /* Process DW_TAG_compile_unit or DW_TAG_partial_unit. */
10360 read_file_scope (struct die_info *die, struct dwarf2_cu *cu)
10362 struct objfile *objfile = dwarf2_per_objfile->objfile;
10363 struct gdbarch *gdbarch = get_objfile_arch (objfile);
10364 CORE_ADDR lowpc = ((CORE_ADDR) -1);
10365 CORE_ADDR highpc = ((CORE_ADDR) 0);
10366 struct attribute *attr;
10367 struct die_info *child_die;
10368 CORE_ADDR baseaddr;
10370 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
10372 get_scope_pc_bounds (die, &lowpc, &highpc, cu);
10374 /* If we didn't find a lowpc, set it to highpc to avoid complaints
10375 from finish_block. */
10376 if (lowpc == ((CORE_ADDR) -1))
10378 lowpc = gdbarch_adjust_dwarf2_addr (gdbarch, lowpc + baseaddr);
10380 file_and_directory fnd = find_file_and_directory (die, cu);
10382 prepare_one_comp_unit (cu, die, cu->language);
10384 /* The XLCL doesn't generate DW_LANG_OpenCL because this attribute is not
10385 standardised yet. As a workaround for the language detection we fall
10386 back to the DW_AT_producer string. */
10387 if (cu->producer && strstr (cu->producer, "IBM XL C for OpenCL") != NULL)
10388 cu->language = language_opencl;
10390 /* Similar hack for Go. */
10391 if (cu->producer && strstr (cu->producer, "GNU Go ") != NULL)
10392 set_cu_language (DW_LANG_Go, cu);
10394 dwarf2_start_symtab (cu, fnd.name, fnd.comp_dir, lowpc);
10396 /* Decode line number information if present. We do this before
10397 processing child DIEs, so that the line header table is available
10398 for DW_AT_decl_file. */
10399 handle_DW_AT_stmt_list (die, cu, fnd.comp_dir, lowpc);
10401 /* Process all dies in compilation unit. */
10402 if (die->child != NULL)
10404 child_die = die->child;
10405 while (child_die && child_die->tag)
10407 process_die (child_die, cu);
10408 child_die = sibling_die (child_die);
10412 /* Decode macro information, if present. Dwarf 2 macro information
10413 refers to information in the line number info statement program
10414 header, so we can only read it if we've read the header
10416 attr = dwarf2_attr (die, DW_AT_macros, cu);
10418 attr = dwarf2_attr (die, DW_AT_GNU_macros, cu);
10419 if (attr && cu->line_header)
10421 if (dwarf2_attr (die, DW_AT_macro_info, cu))
10422 complaint (&symfile_complaints,
10423 _("CU refers to both DW_AT_macros and DW_AT_macro_info"));
10425 dwarf_decode_macros (cu, DW_UNSND (attr), 1);
10429 attr = dwarf2_attr (die, DW_AT_macro_info, cu);
10430 if (attr && cu->line_header)
10432 unsigned int macro_offset = DW_UNSND (attr);
10434 dwarf_decode_macros (cu, macro_offset, 0);
10439 /* TU version of handle_DW_AT_stmt_list for read_type_unit_scope.
10440 Create the set of symtabs used by this TU, or if this TU is sharing
10441 symtabs with another TU and the symtabs have already been created
10442 then restore those symtabs in the line header.
10443 We don't need the pc/line-number mapping for type units. */
10446 setup_type_unit_groups (struct die_info *die, struct dwarf2_cu *cu)
10448 struct dwarf2_per_cu_data *per_cu = cu->per_cu;
10449 struct type_unit_group *tu_group;
10451 struct attribute *attr;
10453 struct signatured_type *sig_type;
10455 gdb_assert (per_cu->is_debug_types);
10456 sig_type = (struct signatured_type *) per_cu;
10458 attr = dwarf2_attr (die, DW_AT_stmt_list, cu);
10460 /* If we're using .gdb_index (includes -readnow) then
10461 per_cu->type_unit_group may not have been set up yet. */
10462 if (sig_type->type_unit_group == NULL)
10463 sig_type->type_unit_group = get_type_unit_group (cu, attr);
10464 tu_group = sig_type->type_unit_group;
10466 /* If we've already processed this stmt_list there's no real need to
10467 do it again, we could fake it and just recreate the part we need
10468 (file name,index -> symtab mapping). If data shows this optimization
10469 is useful we can do it then. */
10470 first_time = tu_group->compunit_symtab == NULL;
10472 /* We have to handle the case of both a missing DW_AT_stmt_list or bad
10477 sect_offset line_offset = (sect_offset) DW_UNSND (attr);
10478 lh = dwarf_decode_line_header (line_offset, cu);
10483 dwarf2_start_symtab (cu, "", NULL, 0);
10486 gdb_assert (tu_group->symtabs == NULL);
10487 restart_symtab (tu_group->compunit_symtab, "", 0);
10492 cu->line_header = lh.release ();
10493 cu->line_header_die_owner = die;
10497 struct compunit_symtab *cust = dwarf2_start_symtab (cu, "", NULL, 0);
10499 /* Note: We don't assign tu_group->compunit_symtab yet because we're
10500 still initializing it, and our caller (a few levels up)
10501 process_full_type_unit still needs to know if this is the first
10504 tu_group->num_symtabs = cu->line_header->file_names.size ();
10505 tu_group->symtabs = XNEWVEC (struct symtab *,
10506 cu->line_header->file_names.size ());
10508 for (i = 0; i < cu->line_header->file_names.size (); ++i)
10510 file_entry &fe = cu->line_header->file_names[i];
10512 dwarf2_start_subfile (fe.name, fe.include_dir (cu->line_header));
10514 if (current_subfile->symtab == NULL)
10516 /* NOTE: start_subfile will recognize when it's been
10517 passed a file it has already seen. So we can't
10518 assume there's a simple mapping from
10519 cu->line_header->file_names to subfiles, plus
10520 cu->line_header->file_names may contain dups. */
10521 current_subfile->symtab
10522 = allocate_symtab (cust, current_subfile->name);
10525 fe.symtab = current_subfile->symtab;
10526 tu_group->symtabs[i] = fe.symtab;
10531 restart_symtab (tu_group->compunit_symtab, "", 0);
10533 for (i = 0; i < cu->line_header->file_names.size (); ++i)
10535 file_entry &fe = cu->line_header->file_names[i];
10537 fe.symtab = tu_group->symtabs[i];
10541 /* The main symtab is allocated last. Type units don't have DW_AT_name
10542 so they don't have a "real" (so to speak) symtab anyway.
10543 There is later code that will assign the main symtab to all symbols
10544 that don't have one. We need to handle the case of a symbol with a
10545 missing symtab (DW_AT_decl_file) anyway. */
10548 /* Process DW_TAG_type_unit.
10549 For TUs we want to skip the first top level sibling if it's not the
10550 actual type being defined by this TU. In this case the first top
10551 level sibling is there to provide context only. */
10554 read_type_unit_scope (struct die_info *die, struct dwarf2_cu *cu)
10556 struct die_info *child_die;
10558 prepare_one_comp_unit (cu, die, language_minimal);
10560 /* Initialize (or reinitialize) the machinery for building symtabs.
10561 We do this before processing child DIEs, so that the line header table
10562 is available for DW_AT_decl_file. */
10563 setup_type_unit_groups (die, cu);
10565 if (die->child != NULL)
10567 child_die = die->child;
10568 while (child_die && child_die->tag)
10570 process_die (child_die, cu);
10571 child_die = sibling_die (child_die);
10578 http://gcc.gnu.org/wiki/DebugFission
10579 http://gcc.gnu.org/wiki/DebugFissionDWP
10581 To simplify handling of both DWO files ("object" files with the DWARF info)
10582 and DWP files (a file with the DWOs packaged up into one file), we treat
10583 DWP files as having a collection of virtual DWO files. */
10586 hash_dwo_file (const void *item)
10588 const struct dwo_file *dwo_file = (const struct dwo_file *) item;
10591 hash = htab_hash_string (dwo_file->dwo_name);
10592 if (dwo_file->comp_dir != NULL)
10593 hash += htab_hash_string (dwo_file->comp_dir);
10598 eq_dwo_file (const void *item_lhs, const void *item_rhs)
10600 const struct dwo_file *lhs = (const struct dwo_file *) item_lhs;
10601 const struct dwo_file *rhs = (const struct dwo_file *) item_rhs;
10603 if (strcmp (lhs->dwo_name, rhs->dwo_name) != 0)
10605 if (lhs->comp_dir == NULL || rhs->comp_dir == NULL)
10606 return lhs->comp_dir == rhs->comp_dir;
10607 return strcmp (lhs->comp_dir, rhs->comp_dir) == 0;
10610 /* Allocate a hash table for DWO files. */
10613 allocate_dwo_file_hash_table (void)
10615 struct objfile *objfile = dwarf2_per_objfile->objfile;
10617 return htab_create_alloc_ex (41,
10621 &objfile->objfile_obstack,
10622 hashtab_obstack_allocate,
10623 dummy_obstack_deallocate);
10626 /* Lookup DWO file DWO_NAME. */
10629 lookup_dwo_file_slot (const char *dwo_name, const char *comp_dir)
10631 struct dwo_file find_entry;
10634 if (dwarf2_per_objfile->dwo_files == NULL)
10635 dwarf2_per_objfile->dwo_files = allocate_dwo_file_hash_table ();
10637 memset (&find_entry, 0, sizeof (find_entry));
10638 find_entry.dwo_name = dwo_name;
10639 find_entry.comp_dir = comp_dir;
10640 slot = htab_find_slot (dwarf2_per_objfile->dwo_files, &find_entry, INSERT);
10646 hash_dwo_unit (const void *item)
10648 const struct dwo_unit *dwo_unit = (const struct dwo_unit *) item;
10650 /* This drops the top 32 bits of the id, but is ok for a hash. */
10651 return dwo_unit->signature;
10655 eq_dwo_unit (const void *item_lhs, const void *item_rhs)
10657 const struct dwo_unit *lhs = (const struct dwo_unit *) item_lhs;
10658 const struct dwo_unit *rhs = (const struct dwo_unit *) item_rhs;
10660 /* The signature is assumed to be unique within the DWO file.
10661 So while object file CU dwo_id's always have the value zero,
10662 that's OK, assuming each object file DWO file has only one CU,
10663 and that's the rule for now. */
10664 return lhs->signature == rhs->signature;
10667 /* Allocate a hash table for DWO CUs,TUs.
10668 There is one of these tables for each of CUs,TUs for each DWO file. */
10671 allocate_dwo_unit_table (struct objfile *objfile)
10673 /* Start out with a pretty small number.
10674 Generally DWO files contain only one CU and maybe some TUs. */
10675 return htab_create_alloc_ex (3,
10679 &objfile->objfile_obstack,
10680 hashtab_obstack_allocate,
10681 dummy_obstack_deallocate);
10684 /* Structure used to pass data to create_dwo_debug_info_hash_table_reader. */
10686 struct create_dwo_cu_data
10688 struct dwo_file *dwo_file;
10689 struct dwo_unit dwo_unit;
10692 /* die_reader_func for create_dwo_cu. */
10695 create_dwo_cu_reader (const struct die_reader_specs *reader,
10696 const gdb_byte *info_ptr,
10697 struct die_info *comp_unit_die,
10701 struct dwarf2_cu *cu = reader->cu;
10702 sect_offset sect_off = cu->per_cu->sect_off;
10703 struct dwarf2_section_info *section = cu->per_cu->section;
10704 struct create_dwo_cu_data *data = (struct create_dwo_cu_data *) datap;
10705 struct dwo_file *dwo_file = data->dwo_file;
10706 struct dwo_unit *dwo_unit = &data->dwo_unit;
10707 struct attribute *attr;
10709 attr = dwarf2_attr (comp_unit_die, DW_AT_GNU_dwo_id, cu);
10712 complaint (&symfile_complaints,
10713 _("Dwarf Error: debug entry at offset 0x%x is missing"
10714 " its dwo_id [in module %s]"),
10715 to_underlying (sect_off), dwo_file->dwo_name);
10719 dwo_unit->dwo_file = dwo_file;
10720 dwo_unit->signature = DW_UNSND (attr);
10721 dwo_unit->section = section;
10722 dwo_unit->sect_off = sect_off;
10723 dwo_unit->length = cu->per_cu->length;
10725 if (dwarf_read_debug)
10726 fprintf_unfiltered (gdb_stdlog, " offset 0x%x, dwo_id %s\n",
10727 to_underlying (sect_off),
10728 hex_string (dwo_unit->signature));
10731 /* Create the dwo_units for the CUs in a DWO_FILE.
10732 Note: This function processes DWO files only, not DWP files. */
10735 create_cus_hash_table (struct dwo_file &dwo_file, dwarf2_section_info §ion,
10738 struct objfile *objfile = dwarf2_per_objfile->objfile;
10739 const struct dwarf2_section_info *abbrev_section = &dwo_file.sections.abbrev;
10740 const gdb_byte *info_ptr, *end_ptr;
10742 dwarf2_read_section (objfile, §ion);
10743 info_ptr = section.buffer;
10745 if (info_ptr == NULL)
10748 if (dwarf_read_debug)
10750 fprintf_unfiltered (gdb_stdlog, "Reading %s for %s:\n",
10751 get_section_name (§ion),
10752 get_section_file_name (§ion));
10755 end_ptr = info_ptr + section.size;
10756 while (info_ptr < end_ptr)
10758 struct dwarf2_per_cu_data per_cu;
10759 struct create_dwo_cu_data create_dwo_cu_data;
10760 struct dwo_unit *dwo_unit;
10762 sect_offset sect_off = (sect_offset) (info_ptr - section.buffer);
10764 memset (&create_dwo_cu_data.dwo_unit, 0,
10765 sizeof (create_dwo_cu_data.dwo_unit));
10766 memset (&per_cu, 0, sizeof (per_cu));
10767 per_cu.objfile = objfile;
10768 per_cu.is_debug_types = 0;
10769 per_cu.sect_off = sect_offset (info_ptr - section.buffer);
10770 per_cu.section = §ion;
10771 create_dwo_cu_data.dwo_file = &dwo_file;
10773 init_cutu_and_read_dies_no_follow (
10774 &per_cu, &dwo_file, create_dwo_cu_reader, &create_dwo_cu_data);
10775 info_ptr += per_cu.length;
10777 // If the unit could not be parsed, skip it.
10778 if (create_dwo_cu_data.dwo_unit.dwo_file == NULL)
10781 if (cus_htab == NULL)
10782 cus_htab = allocate_dwo_unit_table (objfile);
10784 dwo_unit = OBSTACK_ZALLOC (&objfile->objfile_obstack, struct dwo_unit);
10785 *dwo_unit = create_dwo_cu_data.dwo_unit;
10786 slot = htab_find_slot (cus_htab, dwo_unit, INSERT);
10787 gdb_assert (slot != NULL);
10790 const struct dwo_unit *dup_cu = (const struct dwo_unit *)*slot;
10791 sect_offset dup_sect_off = dup_cu->sect_off;
10793 complaint (&symfile_complaints,
10794 _("debug cu entry at offset 0x%x is duplicate to"
10795 " the entry at offset 0x%x, signature %s"),
10796 to_underlying (sect_off), to_underlying (dup_sect_off),
10797 hex_string (dwo_unit->signature));
10799 *slot = (void *)dwo_unit;
10803 /* DWP file .debug_{cu,tu}_index section format:
10804 [ref: http://gcc.gnu.org/wiki/DebugFissionDWP]
10808 Both index sections have the same format, and serve to map a 64-bit
10809 signature to a set of section numbers. Each section begins with a header,
10810 followed by a hash table of 64-bit signatures, a parallel table of 32-bit
10811 indexes, and a pool of 32-bit section numbers. The index sections will be
10812 aligned at 8-byte boundaries in the file.
10814 The index section header consists of:
10816 V, 32 bit version number
10818 N, 32 bit number of compilation units or type units in the index
10819 M, 32 bit number of slots in the hash table
10821 Numbers are recorded using the byte order of the application binary.
10823 The hash table begins at offset 16 in the section, and consists of an array
10824 of M 64-bit slots. Each slot contains a 64-bit signature (using the byte
10825 order of the application binary). Unused slots in the hash table are 0.
10826 (We rely on the extreme unlikeliness of a signature being exactly 0.)
10828 The parallel table begins immediately after the hash table
10829 (at offset 16 + 8 * M from the beginning of the section), and consists of an
10830 array of 32-bit indexes (using the byte order of the application binary),
10831 corresponding 1-1 with slots in the hash table. Each entry in the parallel
10832 table contains a 32-bit index into the pool of section numbers. For unused
10833 hash table slots, the corresponding entry in the parallel table will be 0.
10835 The pool of section numbers begins immediately following the hash table
10836 (at offset 16 + 12 * M from the beginning of the section). The pool of
10837 section numbers consists of an array of 32-bit words (using the byte order
10838 of the application binary). Each item in the array is indexed starting
10839 from 0. The hash table entry provides the index of the first section
10840 number in the set. Additional section numbers in the set follow, and the
10841 set is terminated by a 0 entry (section number 0 is not used in ELF).
10843 In each set of section numbers, the .debug_info.dwo or .debug_types.dwo
10844 section must be the first entry in the set, and the .debug_abbrev.dwo must
10845 be the second entry. Other members of the set may follow in any order.
10851 DWP Version 2 combines all the .debug_info, etc. sections into one,
10852 and the entries in the index tables are now offsets into these sections.
10853 CU offsets begin at 0. TU offsets begin at the size of the .debug_info
10856 Index Section Contents:
10858 Hash Table of Signatures dwp_hash_table.hash_table
10859 Parallel Table of Indices dwp_hash_table.unit_table
10860 Table of Section Offsets dwp_hash_table.v2.{section_ids,offsets}
10861 Table of Section Sizes dwp_hash_table.v2.sizes
10863 The index section header consists of:
10865 V, 32 bit version number
10866 L, 32 bit number of columns in the table of section offsets
10867 N, 32 bit number of compilation units or type units in the index
10868 M, 32 bit number of slots in the hash table
10870 Numbers are recorded using the byte order of the application binary.
10872 The hash table has the same format as version 1.
10873 The parallel table of indices has the same format as version 1,
10874 except that the entries are origin-1 indices into the table of sections
10875 offsets and the table of section sizes.
10877 The table of offsets begins immediately following the parallel table
10878 (at offset 16 + 12 * M from the beginning of the section). The table is
10879 a two-dimensional array of 32-bit words (using the byte order of the
10880 application binary), with L columns and N+1 rows, in row-major order.
10881 Each row in the array is indexed starting from 0. The first row provides
10882 a key to the remaining rows: each column in this row provides an identifier
10883 for a debug section, and the offsets in the same column of subsequent rows
10884 refer to that section. The section identifiers are:
10886 DW_SECT_INFO 1 .debug_info.dwo
10887 DW_SECT_TYPES 2 .debug_types.dwo
10888 DW_SECT_ABBREV 3 .debug_abbrev.dwo
10889 DW_SECT_LINE 4 .debug_line.dwo
10890 DW_SECT_LOC 5 .debug_loc.dwo
10891 DW_SECT_STR_OFFSETS 6 .debug_str_offsets.dwo
10892 DW_SECT_MACINFO 7 .debug_macinfo.dwo
10893 DW_SECT_MACRO 8 .debug_macro.dwo
10895 The offsets provided by the CU and TU index sections are the base offsets
10896 for the contributions made by each CU or TU to the corresponding section
10897 in the package file. Each CU and TU header contains an abbrev_offset
10898 field, used to find the abbreviations table for that CU or TU within the
10899 contribution to the .debug_abbrev.dwo section for that CU or TU, and should
10900 be interpreted as relative to the base offset given in the index section.
10901 Likewise, offsets into .debug_line.dwo from DW_AT_stmt_list attributes
10902 should be interpreted as relative to the base offset for .debug_line.dwo,
10903 and offsets into other debug sections obtained from DWARF attributes should
10904 also be interpreted as relative to the corresponding base offset.
10906 The table of sizes begins immediately following the table of offsets.
10907 Like the table of offsets, it is a two-dimensional array of 32-bit words,
10908 with L columns and N rows, in row-major order. Each row in the array is
10909 indexed starting from 1 (row 0 is shared by the two tables).
10913 Hash table lookup is handled the same in version 1 and 2:
10915 We assume that N and M will not exceed 2^32 - 1.
10916 The size of the hash table, M, must be 2^k such that 2^k > 3*N/2.
10918 Given a 64-bit compilation unit signature or a type signature S, an entry
10919 in the hash table is located as follows:
10921 1) Calculate a primary hash H = S & MASK(k), where MASK(k) is a mask with
10922 the low-order k bits all set to 1.
10924 2) Calculate a secondary hash H' = (((S >> 32) & MASK(k)) | 1).
10926 3) If the hash table entry at index H matches the signature, use that
10927 entry. If the hash table entry at index H is unused (all zeroes),
10928 terminate the search: the signature is not present in the table.
10930 4) Let H = (H + H') modulo M. Repeat at Step 3.
10932 Because M > N and H' and M are relatively prime, the search is guaranteed
10933 to stop at an unused slot or find the match. */
10935 /* Create a hash table to map DWO IDs to their CU/TU entry in
10936 .debug_{info,types}.dwo in DWP_FILE.
10937 Returns NULL if there isn't one.
10938 Note: This function processes DWP files only, not DWO files. */
10940 static struct dwp_hash_table *
10941 create_dwp_hash_table (struct dwp_file *dwp_file, int is_debug_types)
10943 struct objfile *objfile = dwarf2_per_objfile->objfile;
10944 bfd *dbfd = dwp_file->dbfd;
10945 const gdb_byte *index_ptr, *index_end;
10946 struct dwarf2_section_info *index;
10947 uint32_t version, nr_columns, nr_units, nr_slots;
10948 struct dwp_hash_table *htab;
10950 if (is_debug_types)
10951 index = &dwp_file->sections.tu_index;
10953 index = &dwp_file->sections.cu_index;
10955 if (dwarf2_section_empty_p (index))
10957 dwarf2_read_section (objfile, index);
10959 index_ptr = index->buffer;
10960 index_end = index_ptr + index->size;
10962 version = read_4_bytes (dbfd, index_ptr);
10965 nr_columns = read_4_bytes (dbfd, index_ptr);
10969 nr_units = read_4_bytes (dbfd, index_ptr);
10971 nr_slots = read_4_bytes (dbfd, index_ptr);
10974 if (version != 1 && version != 2)
10976 error (_("Dwarf Error: unsupported DWP file version (%s)"
10977 " [in module %s]"),
10978 pulongest (version), dwp_file->name);
10980 if (nr_slots != (nr_slots & -nr_slots))
10982 error (_("Dwarf Error: number of slots in DWP hash table (%s)"
10983 " is not power of 2 [in module %s]"),
10984 pulongest (nr_slots), dwp_file->name);
10987 htab = OBSTACK_ZALLOC (&objfile->objfile_obstack, struct dwp_hash_table);
10988 htab->version = version;
10989 htab->nr_columns = nr_columns;
10990 htab->nr_units = nr_units;
10991 htab->nr_slots = nr_slots;
10992 htab->hash_table = index_ptr;
10993 htab->unit_table = htab->hash_table + sizeof (uint64_t) * nr_slots;
10995 /* Exit early if the table is empty. */
10996 if (nr_slots == 0 || nr_units == 0
10997 || (version == 2 && nr_columns == 0))
10999 /* All must be zero. */
11000 if (nr_slots != 0 || nr_units != 0
11001 || (version == 2 && nr_columns != 0))
11003 complaint (&symfile_complaints,
11004 _("Empty DWP but nr_slots,nr_units,nr_columns not"
11005 " all zero [in modules %s]"),
11013 htab->section_pool.v1.indices =
11014 htab->unit_table + sizeof (uint32_t) * nr_slots;
11015 /* It's harder to decide whether the section is too small in v1.
11016 V1 is deprecated anyway so we punt. */
11020 const gdb_byte *ids_ptr = htab->unit_table + sizeof (uint32_t) * nr_slots;
11021 int *ids = htab->section_pool.v2.section_ids;
11022 /* Reverse map for error checking. */
11023 int ids_seen[DW_SECT_MAX + 1];
11026 if (nr_columns < 2)
11028 error (_("Dwarf Error: bad DWP hash table, too few columns"
11029 " in section table [in module %s]"),
11032 if (nr_columns > MAX_NR_V2_DWO_SECTIONS)
11034 error (_("Dwarf Error: bad DWP hash table, too many columns"
11035 " in section table [in module %s]"),
11038 memset (ids, 255, (DW_SECT_MAX + 1) * sizeof (int32_t));
11039 memset (ids_seen, 255, (DW_SECT_MAX + 1) * sizeof (int32_t));
11040 for (i = 0; i < nr_columns; ++i)
11042 int id = read_4_bytes (dbfd, ids_ptr + i * sizeof (uint32_t));
11044 if (id < DW_SECT_MIN || id > DW_SECT_MAX)
11046 error (_("Dwarf Error: bad DWP hash table, bad section id %d"
11047 " in section table [in module %s]"),
11048 id, dwp_file->name);
11050 if (ids_seen[id] != -1)
11052 error (_("Dwarf Error: bad DWP hash table, duplicate section"
11053 " id %d in section table [in module %s]"),
11054 id, dwp_file->name);
11059 /* Must have exactly one info or types section. */
11060 if (((ids_seen[DW_SECT_INFO] != -1)
11061 + (ids_seen[DW_SECT_TYPES] != -1))
11064 error (_("Dwarf Error: bad DWP hash table, missing/duplicate"
11065 " DWO info/types section [in module %s]"),
11068 /* Must have an abbrev section. */
11069 if (ids_seen[DW_SECT_ABBREV] == -1)
11071 error (_("Dwarf Error: bad DWP hash table, missing DWO abbrev"
11072 " section [in module %s]"),
11075 htab->section_pool.v2.offsets = ids_ptr + sizeof (uint32_t) * nr_columns;
11076 htab->section_pool.v2.sizes =
11077 htab->section_pool.v2.offsets + (sizeof (uint32_t)
11078 * nr_units * nr_columns);
11079 if ((htab->section_pool.v2.sizes + (sizeof (uint32_t)
11080 * nr_units * nr_columns))
11083 error (_("Dwarf Error: DWP index section is corrupt (too small)"
11084 " [in module %s]"),
11092 /* Update SECTIONS with the data from SECTP.
11094 This function is like the other "locate" section routines that are
11095 passed to bfd_map_over_sections, but in this context the sections to
11096 read comes from the DWP V1 hash table, not the full ELF section table.
11098 The result is non-zero for success, or zero if an error was found. */
11101 locate_v1_virtual_dwo_sections (asection *sectp,
11102 struct virtual_v1_dwo_sections *sections)
11104 const struct dwop_section_names *names = &dwop_section_names;
11106 if (section_is_p (sectp->name, &names->abbrev_dwo))
11108 /* There can be only one. */
11109 if (sections->abbrev.s.section != NULL)
11111 sections->abbrev.s.section = sectp;
11112 sections->abbrev.size = bfd_get_section_size (sectp);
11114 else if (section_is_p (sectp->name, &names->info_dwo)
11115 || section_is_p (sectp->name, &names->types_dwo))
11117 /* There can be only one. */
11118 if (sections->info_or_types.s.section != NULL)
11120 sections->info_or_types.s.section = sectp;
11121 sections->info_or_types.size = bfd_get_section_size (sectp);
11123 else if (section_is_p (sectp->name, &names->line_dwo))
11125 /* There can be only one. */
11126 if (sections->line.s.section != NULL)
11128 sections->line.s.section = sectp;
11129 sections->line.size = bfd_get_section_size (sectp);
11131 else if (section_is_p (sectp->name, &names->loc_dwo))
11133 /* There can be only one. */
11134 if (sections->loc.s.section != NULL)
11136 sections->loc.s.section = sectp;
11137 sections->loc.size = bfd_get_section_size (sectp);
11139 else if (section_is_p (sectp->name, &names->macinfo_dwo))
11141 /* There can be only one. */
11142 if (sections->macinfo.s.section != NULL)
11144 sections->macinfo.s.section = sectp;
11145 sections->macinfo.size = bfd_get_section_size (sectp);
11147 else if (section_is_p (sectp->name, &names->macro_dwo))
11149 /* There can be only one. */
11150 if (sections->macro.s.section != NULL)
11152 sections->macro.s.section = sectp;
11153 sections->macro.size = bfd_get_section_size (sectp);
11155 else if (section_is_p (sectp->name, &names->str_offsets_dwo))
11157 /* There can be only one. */
11158 if (sections->str_offsets.s.section != NULL)
11160 sections->str_offsets.s.section = sectp;
11161 sections->str_offsets.size = bfd_get_section_size (sectp);
11165 /* No other kind of section is valid. */
11172 /* Create a dwo_unit object for the DWO unit with signature SIGNATURE.
11173 UNIT_INDEX is the index of the DWO unit in the DWP hash table.
11174 COMP_DIR is the DW_AT_comp_dir attribute of the referencing CU.
11175 This is for DWP version 1 files. */
11177 static struct dwo_unit *
11178 create_dwo_unit_in_dwp_v1 (struct dwp_file *dwp_file,
11179 uint32_t unit_index,
11180 const char *comp_dir,
11181 ULONGEST signature, int is_debug_types)
11183 struct objfile *objfile = dwarf2_per_objfile->objfile;
11184 const struct dwp_hash_table *dwp_htab =
11185 is_debug_types ? dwp_file->tus : dwp_file->cus;
11186 bfd *dbfd = dwp_file->dbfd;
11187 const char *kind = is_debug_types ? "TU" : "CU";
11188 struct dwo_file *dwo_file;
11189 struct dwo_unit *dwo_unit;
11190 struct virtual_v1_dwo_sections sections;
11191 void **dwo_file_slot;
11194 gdb_assert (dwp_file->version == 1);
11196 if (dwarf_read_debug)
11198 fprintf_unfiltered (gdb_stdlog, "Reading %s %s/%s in DWP V1 file: %s\n",
11200 pulongest (unit_index), hex_string (signature),
11204 /* Fetch the sections of this DWO unit.
11205 Put a limit on the number of sections we look for so that bad data
11206 doesn't cause us to loop forever. */
11208 #define MAX_NR_V1_DWO_SECTIONS \
11209 (1 /* .debug_info or .debug_types */ \
11210 + 1 /* .debug_abbrev */ \
11211 + 1 /* .debug_line */ \
11212 + 1 /* .debug_loc */ \
11213 + 1 /* .debug_str_offsets */ \
11214 + 1 /* .debug_macro or .debug_macinfo */ \
11215 + 1 /* trailing zero */)
11217 memset (§ions, 0, sizeof (sections));
11219 for (i = 0; i < MAX_NR_V1_DWO_SECTIONS; ++i)
11222 uint32_t section_nr =
11223 read_4_bytes (dbfd,
11224 dwp_htab->section_pool.v1.indices
11225 + (unit_index + i) * sizeof (uint32_t));
11227 if (section_nr == 0)
11229 if (section_nr >= dwp_file->num_sections)
11231 error (_("Dwarf Error: bad DWP hash table, section number too large"
11232 " [in module %s]"),
11236 sectp = dwp_file->elf_sections[section_nr];
11237 if (! locate_v1_virtual_dwo_sections (sectp, §ions))
11239 error (_("Dwarf Error: bad DWP hash table, invalid section found"
11240 " [in module %s]"),
11246 || dwarf2_section_empty_p (§ions.info_or_types)
11247 || dwarf2_section_empty_p (§ions.abbrev))
11249 error (_("Dwarf Error: bad DWP hash table, missing DWO sections"
11250 " [in module %s]"),
11253 if (i == MAX_NR_V1_DWO_SECTIONS)
11255 error (_("Dwarf Error: bad DWP hash table, too many DWO sections"
11256 " [in module %s]"),
11260 /* It's easier for the rest of the code if we fake a struct dwo_file and
11261 have dwo_unit "live" in that. At least for now.
11263 The DWP file can be made up of a random collection of CUs and TUs.
11264 However, for each CU + set of TUs that came from the same original DWO
11265 file, we can combine them back into a virtual DWO file to save space
11266 (fewer struct dwo_file objects to allocate). Remember that for really
11267 large apps there can be on the order of 8K CUs and 200K TUs, or more. */
11269 std::string virtual_dwo_name =
11270 string_printf ("virtual-dwo/%d-%d-%d-%d",
11271 get_section_id (§ions.abbrev),
11272 get_section_id (§ions.line),
11273 get_section_id (§ions.loc),
11274 get_section_id (§ions.str_offsets));
11275 /* Can we use an existing virtual DWO file? */
11276 dwo_file_slot = lookup_dwo_file_slot (virtual_dwo_name.c_str (), comp_dir);
11277 /* Create one if necessary. */
11278 if (*dwo_file_slot == NULL)
11280 if (dwarf_read_debug)
11282 fprintf_unfiltered (gdb_stdlog, "Creating virtual DWO: %s\n",
11283 virtual_dwo_name.c_str ());
11285 dwo_file = OBSTACK_ZALLOC (&objfile->objfile_obstack, struct dwo_file);
11287 = (const char *) obstack_copy0 (&objfile->objfile_obstack,
11288 virtual_dwo_name.c_str (),
11289 virtual_dwo_name.size ());
11290 dwo_file->comp_dir = comp_dir;
11291 dwo_file->sections.abbrev = sections.abbrev;
11292 dwo_file->sections.line = sections.line;
11293 dwo_file->sections.loc = sections.loc;
11294 dwo_file->sections.macinfo = sections.macinfo;
11295 dwo_file->sections.macro = sections.macro;
11296 dwo_file->sections.str_offsets = sections.str_offsets;
11297 /* The "str" section is global to the entire DWP file. */
11298 dwo_file->sections.str = dwp_file->sections.str;
11299 /* The info or types section is assigned below to dwo_unit,
11300 there's no need to record it in dwo_file.
11301 Also, we can't simply record type sections in dwo_file because
11302 we record a pointer into the vector in dwo_unit. As we collect more
11303 types we'll grow the vector and eventually have to reallocate space
11304 for it, invalidating all copies of pointers into the previous
11306 *dwo_file_slot = dwo_file;
11310 if (dwarf_read_debug)
11312 fprintf_unfiltered (gdb_stdlog, "Using existing virtual DWO: %s\n",
11313 virtual_dwo_name.c_str ());
11315 dwo_file = (struct dwo_file *) *dwo_file_slot;
11318 dwo_unit = OBSTACK_ZALLOC (&objfile->objfile_obstack, struct dwo_unit);
11319 dwo_unit->dwo_file = dwo_file;
11320 dwo_unit->signature = signature;
11321 dwo_unit->section =
11322 XOBNEW (&objfile->objfile_obstack, struct dwarf2_section_info);
11323 *dwo_unit->section = sections.info_or_types;
11324 /* dwo_unit->{offset,length,type_offset_in_tu} are set later. */
11329 /* Subroutine of create_dwo_unit_in_dwp_v2 to simplify it.
11330 Given a pointer to the containing section SECTION, and OFFSET,SIZE of the
11331 piece within that section used by a TU/CU, return a virtual section
11332 of just that piece. */
11334 static struct dwarf2_section_info
11335 create_dwp_v2_section (struct dwarf2_section_info *section,
11336 bfd_size_type offset, bfd_size_type size)
11338 struct dwarf2_section_info result;
11341 gdb_assert (section != NULL);
11342 gdb_assert (!section->is_virtual);
11344 memset (&result, 0, sizeof (result));
11345 result.s.containing_section = section;
11346 result.is_virtual = 1;
11351 sectp = get_section_bfd_section (section);
11353 /* Flag an error if the piece denoted by OFFSET,SIZE is outside the
11354 bounds of the real section. This is a pretty-rare event, so just
11355 flag an error (easier) instead of a warning and trying to cope. */
11357 || offset + size > bfd_get_section_size (sectp))
11359 bfd *abfd = sectp->owner;
11361 error (_("Dwarf Error: Bad DWP V2 section info, doesn't fit"
11362 " in section %s [in module %s]"),
11363 sectp ? bfd_section_name (abfd, sectp) : "<unknown>",
11364 objfile_name (dwarf2_per_objfile->objfile));
11367 result.virtual_offset = offset;
11368 result.size = size;
11372 /* Create a dwo_unit object for the DWO unit with signature SIGNATURE.
11373 UNIT_INDEX is the index of the DWO unit in the DWP hash table.
11374 COMP_DIR is the DW_AT_comp_dir attribute of the referencing CU.
11375 This is for DWP version 2 files. */
11377 static struct dwo_unit *
11378 create_dwo_unit_in_dwp_v2 (struct dwp_file *dwp_file,
11379 uint32_t unit_index,
11380 const char *comp_dir,
11381 ULONGEST signature, int is_debug_types)
11383 struct objfile *objfile = dwarf2_per_objfile->objfile;
11384 const struct dwp_hash_table *dwp_htab =
11385 is_debug_types ? dwp_file->tus : dwp_file->cus;
11386 bfd *dbfd = dwp_file->dbfd;
11387 const char *kind = is_debug_types ? "TU" : "CU";
11388 struct dwo_file *dwo_file;
11389 struct dwo_unit *dwo_unit;
11390 struct virtual_v2_dwo_sections sections;
11391 void **dwo_file_slot;
11394 gdb_assert (dwp_file->version == 2);
11396 if (dwarf_read_debug)
11398 fprintf_unfiltered (gdb_stdlog, "Reading %s %s/%s in DWP V2 file: %s\n",
11400 pulongest (unit_index), hex_string (signature),
11404 /* Fetch the section offsets of this DWO unit. */
11406 memset (§ions, 0, sizeof (sections));
11408 for (i = 0; i < dwp_htab->nr_columns; ++i)
11410 uint32_t offset = read_4_bytes (dbfd,
11411 dwp_htab->section_pool.v2.offsets
11412 + (((unit_index - 1) * dwp_htab->nr_columns
11414 * sizeof (uint32_t)));
11415 uint32_t size = read_4_bytes (dbfd,
11416 dwp_htab->section_pool.v2.sizes
11417 + (((unit_index - 1) * dwp_htab->nr_columns
11419 * sizeof (uint32_t)));
11421 switch (dwp_htab->section_pool.v2.section_ids[i])
11424 case DW_SECT_TYPES:
11425 sections.info_or_types_offset = offset;
11426 sections.info_or_types_size = size;
11428 case DW_SECT_ABBREV:
11429 sections.abbrev_offset = offset;
11430 sections.abbrev_size = size;
11433 sections.line_offset = offset;
11434 sections.line_size = size;
11437 sections.loc_offset = offset;
11438 sections.loc_size = size;
11440 case DW_SECT_STR_OFFSETS:
11441 sections.str_offsets_offset = offset;
11442 sections.str_offsets_size = size;
11444 case DW_SECT_MACINFO:
11445 sections.macinfo_offset = offset;
11446 sections.macinfo_size = size;
11448 case DW_SECT_MACRO:
11449 sections.macro_offset = offset;
11450 sections.macro_size = size;
11455 /* It's easier for the rest of the code if we fake a struct dwo_file and
11456 have dwo_unit "live" in that. At least for now.
11458 The DWP file can be made up of a random collection of CUs and TUs.
11459 However, for each CU + set of TUs that came from the same original DWO
11460 file, we can combine them back into a virtual DWO file to save space
11461 (fewer struct dwo_file objects to allocate). Remember that for really
11462 large apps there can be on the order of 8K CUs and 200K TUs, or more. */
11464 std::string virtual_dwo_name =
11465 string_printf ("virtual-dwo/%ld-%ld-%ld-%ld",
11466 (long) (sections.abbrev_size ? sections.abbrev_offset : 0),
11467 (long) (sections.line_size ? sections.line_offset : 0),
11468 (long) (sections.loc_size ? sections.loc_offset : 0),
11469 (long) (sections.str_offsets_size
11470 ? sections.str_offsets_offset : 0));
11471 /* Can we use an existing virtual DWO file? */
11472 dwo_file_slot = lookup_dwo_file_slot (virtual_dwo_name.c_str (), comp_dir);
11473 /* Create one if necessary. */
11474 if (*dwo_file_slot == NULL)
11476 if (dwarf_read_debug)
11478 fprintf_unfiltered (gdb_stdlog, "Creating virtual DWO: %s\n",
11479 virtual_dwo_name.c_str ());
11481 dwo_file = OBSTACK_ZALLOC (&objfile->objfile_obstack, struct dwo_file);
11483 = (const char *) obstack_copy0 (&objfile->objfile_obstack,
11484 virtual_dwo_name.c_str (),
11485 virtual_dwo_name.size ());
11486 dwo_file->comp_dir = comp_dir;
11487 dwo_file->sections.abbrev =
11488 create_dwp_v2_section (&dwp_file->sections.abbrev,
11489 sections.abbrev_offset, sections.abbrev_size);
11490 dwo_file->sections.line =
11491 create_dwp_v2_section (&dwp_file->sections.line,
11492 sections.line_offset, sections.line_size);
11493 dwo_file->sections.loc =
11494 create_dwp_v2_section (&dwp_file->sections.loc,
11495 sections.loc_offset, sections.loc_size);
11496 dwo_file->sections.macinfo =
11497 create_dwp_v2_section (&dwp_file->sections.macinfo,
11498 sections.macinfo_offset, sections.macinfo_size);
11499 dwo_file->sections.macro =
11500 create_dwp_v2_section (&dwp_file->sections.macro,
11501 sections.macro_offset, sections.macro_size);
11502 dwo_file->sections.str_offsets =
11503 create_dwp_v2_section (&dwp_file->sections.str_offsets,
11504 sections.str_offsets_offset,
11505 sections.str_offsets_size);
11506 /* The "str" section is global to the entire DWP file. */
11507 dwo_file->sections.str = dwp_file->sections.str;
11508 /* The info or types section is assigned below to dwo_unit,
11509 there's no need to record it in dwo_file.
11510 Also, we can't simply record type sections in dwo_file because
11511 we record a pointer into the vector in dwo_unit. As we collect more
11512 types we'll grow the vector and eventually have to reallocate space
11513 for it, invalidating all copies of pointers into the previous
11515 *dwo_file_slot = dwo_file;
11519 if (dwarf_read_debug)
11521 fprintf_unfiltered (gdb_stdlog, "Using existing virtual DWO: %s\n",
11522 virtual_dwo_name.c_str ());
11524 dwo_file = (struct dwo_file *) *dwo_file_slot;
11527 dwo_unit = OBSTACK_ZALLOC (&objfile->objfile_obstack, struct dwo_unit);
11528 dwo_unit->dwo_file = dwo_file;
11529 dwo_unit->signature = signature;
11530 dwo_unit->section =
11531 XOBNEW (&objfile->objfile_obstack, struct dwarf2_section_info);
11532 *dwo_unit->section = create_dwp_v2_section (is_debug_types
11533 ? &dwp_file->sections.types
11534 : &dwp_file->sections.info,
11535 sections.info_or_types_offset,
11536 sections.info_or_types_size);
11537 /* dwo_unit->{offset,length,type_offset_in_tu} are set later. */
11542 /* Lookup the DWO unit with SIGNATURE in DWP_FILE.
11543 Returns NULL if the signature isn't found. */
11545 static struct dwo_unit *
11546 lookup_dwo_unit_in_dwp (struct dwp_file *dwp_file, const char *comp_dir,
11547 ULONGEST signature, int is_debug_types)
11549 const struct dwp_hash_table *dwp_htab =
11550 is_debug_types ? dwp_file->tus : dwp_file->cus;
11551 bfd *dbfd = dwp_file->dbfd;
11552 uint32_t mask = dwp_htab->nr_slots - 1;
11553 uint32_t hash = signature & mask;
11554 uint32_t hash2 = ((signature >> 32) & mask) | 1;
11557 struct dwo_unit find_dwo_cu;
11559 memset (&find_dwo_cu, 0, sizeof (find_dwo_cu));
11560 find_dwo_cu.signature = signature;
11561 slot = htab_find_slot (is_debug_types
11562 ? dwp_file->loaded_tus
11563 : dwp_file->loaded_cus,
11564 &find_dwo_cu, INSERT);
11567 return (struct dwo_unit *) *slot;
11569 /* Use a for loop so that we don't loop forever on bad debug info. */
11570 for (i = 0; i < dwp_htab->nr_slots; ++i)
11572 ULONGEST signature_in_table;
11574 signature_in_table =
11575 read_8_bytes (dbfd, dwp_htab->hash_table + hash * sizeof (uint64_t));
11576 if (signature_in_table == signature)
11578 uint32_t unit_index =
11579 read_4_bytes (dbfd,
11580 dwp_htab->unit_table + hash * sizeof (uint32_t));
11582 if (dwp_file->version == 1)
11584 *slot = create_dwo_unit_in_dwp_v1 (dwp_file, unit_index,
11585 comp_dir, signature,
11590 *slot = create_dwo_unit_in_dwp_v2 (dwp_file, unit_index,
11591 comp_dir, signature,
11594 return (struct dwo_unit *) *slot;
11596 if (signature_in_table == 0)
11598 hash = (hash + hash2) & mask;
11601 error (_("Dwarf Error: bad DWP hash table, lookup didn't terminate"
11602 " [in module %s]"),
11606 /* Subroutine of open_dwo_file,open_dwp_file to simplify them.
11607 Open the file specified by FILE_NAME and hand it off to BFD for
11608 preliminary analysis. Return a newly initialized bfd *, which
11609 includes a canonicalized copy of FILE_NAME.
11610 If IS_DWP is TRUE, we're opening a DWP file, otherwise a DWO file.
11611 SEARCH_CWD is true if the current directory is to be searched.
11612 It will be searched before debug-file-directory.
11613 If successful, the file is added to the bfd include table of the
11614 objfile's bfd (see gdb_bfd_record_inclusion).
11615 If unable to find/open the file, return NULL.
11616 NOTE: This function is derived from symfile_bfd_open. */
11618 static gdb_bfd_ref_ptr
11619 try_open_dwop_file (const char *file_name, int is_dwp, int search_cwd)
11622 char *absolute_name;
11623 /* Blech. OPF_TRY_CWD_FIRST also disables searching the path list if
11624 FILE_NAME contains a '/'. So we can't use it. Instead prepend "."
11625 to debug_file_directory. */
11627 static const char dirname_separator_string[] = { DIRNAME_SEPARATOR, '\0' };
11631 if (*debug_file_directory != '\0')
11632 search_path = concat (".", dirname_separator_string,
11633 debug_file_directory, (char *) NULL);
11635 search_path = xstrdup (".");
11638 search_path = xstrdup (debug_file_directory);
11640 flags = OPF_RETURN_REALPATH;
11642 flags |= OPF_SEARCH_IN_PATH;
11643 desc = openp (search_path, flags, file_name,
11644 O_RDONLY | O_BINARY, &absolute_name);
11645 xfree (search_path);
11649 gdb_bfd_ref_ptr sym_bfd (gdb_bfd_open (absolute_name, gnutarget, desc));
11650 xfree (absolute_name);
11651 if (sym_bfd == NULL)
11653 bfd_set_cacheable (sym_bfd.get (), 1);
11655 if (!bfd_check_format (sym_bfd.get (), bfd_object))
11658 /* Success. Record the bfd as having been included by the objfile's bfd.
11659 This is important because things like demangled_names_hash lives in the
11660 objfile's per_bfd space and may have references to things like symbol
11661 names that live in the DWO/DWP file's per_bfd space. PR 16426. */
11662 gdb_bfd_record_inclusion (dwarf2_per_objfile->objfile->obfd, sym_bfd.get ());
11667 /* Try to open DWO file FILE_NAME.
11668 COMP_DIR is the DW_AT_comp_dir attribute.
11669 The result is the bfd handle of the file.
11670 If there is a problem finding or opening the file, return NULL.
11671 Upon success, the canonicalized path of the file is stored in the bfd,
11672 same as symfile_bfd_open. */
11674 static gdb_bfd_ref_ptr
11675 open_dwo_file (const char *file_name, const char *comp_dir)
11677 if (IS_ABSOLUTE_PATH (file_name))
11678 return try_open_dwop_file (file_name, 0 /*is_dwp*/, 0 /*search_cwd*/);
11680 /* Before trying the search path, try DWO_NAME in COMP_DIR. */
11682 if (comp_dir != NULL)
11684 char *path_to_try = concat (comp_dir, SLASH_STRING,
11685 file_name, (char *) NULL);
11687 /* NOTE: If comp_dir is a relative path, this will also try the
11688 search path, which seems useful. */
11689 gdb_bfd_ref_ptr abfd (try_open_dwop_file (path_to_try, 0 /*is_dwp*/,
11690 1 /*search_cwd*/));
11691 xfree (path_to_try);
11696 /* That didn't work, try debug-file-directory, which, despite its name,
11697 is a list of paths. */
11699 if (*debug_file_directory == '\0')
11702 return try_open_dwop_file (file_name, 0 /*is_dwp*/, 1 /*search_cwd*/);
11705 /* This function is mapped across the sections and remembers the offset and
11706 size of each of the DWO debugging sections we are interested in. */
11709 dwarf2_locate_dwo_sections (bfd *abfd, asection *sectp, void *dwo_sections_ptr)
11711 struct dwo_sections *dwo_sections = (struct dwo_sections *) dwo_sections_ptr;
11712 const struct dwop_section_names *names = &dwop_section_names;
11714 if (section_is_p (sectp->name, &names->abbrev_dwo))
11716 dwo_sections->abbrev.s.section = sectp;
11717 dwo_sections->abbrev.size = bfd_get_section_size (sectp);
11719 else if (section_is_p (sectp->name, &names->info_dwo))
11721 dwo_sections->info.s.section = sectp;
11722 dwo_sections->info.size = bfd_get_section_size (sectp);
11724 else if (section_is_p (sectp->name, &names->line_dwo))
11726 dwo_sections->line.s.section = sectp;
11727 dwo_sections->line.size = bfd_get_section_size (sectp);
11729 else if (section_is_p (sectp->name, &names->loc_dwo))
11731 dwo_sections->loc.s.section = sectp;
11732 dwo_sections->loc.size = bfd_get_section_size (sectp);
11734 else if (section_is_p (sectp->name, &names->macinfo_dwo))
11736 dwo_sections->macinfo.s.section = sectp;
11737 dwo_sections->macinfo.size = bfd_get_section_size (sectp);
11739 else if (section_is_p (sectp->name, &names->macro_dwo))
11741 dwo_sections->macro.s.section = sectp;
11742 dwo_sections->macro.size = bfd_get_section_size (sectp);
11744 else if (section_is_p (sectp->name, &names->str_dwo))
11746 dwo_sections->str.s.section = sectp;
11747 dwo_sections->str.size = bfd_get_section_size (sectp);
11749 else if (section_is_p (sectp->name, &names->str_offsets_dwo))
11751 dwo_sections->str_offsets.s.section = sectp;
11752 dwo_sections->str_offsets.size = bfd_get_section_size (sectp);
11754 else if (section_is_p (sectp->name, &names->types_dwo))
11756 struct dwarf2_section_info type_section;
11758 memset (&type_section, 0, sizeof (type_section));
11759 type_section.s.section = sectp;
11760 type_section.size = bfd_get_section_size (sectp);
11761 VEC_safe_push (dwarf2_section_info_def, dwo_sections->types,
11766 /* Initialize the use of the DWO file specified by DWO_NAME and referenced
11767 by PER_CU. This is for the non-DWP case.
11768 The result is NULL if DWO_NAME can't be found. */
11770 static struct dwo_file *
11771 open_and_init_dwo_file (struct dwarf2_per_cu_data *per_cu,
11772 const char *dwo_name, const char *comp_dir)
11774 struct objfile *objfile = dwarf2_per_objfile->objfile;
11775 struct dwo_file *dwo_file;
11776 struct cleanup *cleanups;
11778 gdb_bfd_ref_ptr dbfd (open_dwo_file (dwo_name, comp_dir));
11781 if (dwarf_read_debug)
11782 fprintf_unfiltered (gdb_stdlog, "DWO file not found: %s\n", dwo_name);
11785 dwo_file = OBSTACK_ZALLOC (&objfile->objfile_obstack, struct dwo_file);
11786 dwo_file->dwo_name = dwo_name;
11787 dwo_file->comp_dir = comp_dir;
11788 dwo_file->dbfd = dbfd.release ();
11790 cleanups = make_cleanup (free_dwo_file_cleanup, dwo_file);
11792 bfd_map_over_sections (dwo_file->dbfd, dwarf2_locate_dwo_sections,
11793 &dwo_file->sections);
11795 create_cus_hash_table (*dwo_file, dwo_file->sections.info, dwo_file->cus);
11797 create_debug_types_hash_table (dwo_file, dwo_file->sections.types,
11800 discard_cleanups (cleanups);
11802 if (dwarf_read_debug)
11803 fprintf_unfiltered (gdb_stdlog, "DWO file found: %s\n", dwo_name);
11808 /* This function is mapped across the sections and remembers the offset and
11809 size of each of the DWP debugging sections common to version 1 and 2 that
11810 we are interested in. */
11813 dwarf2_locate_common_dwp_sections (bfd *abfd, asection *sectp,
11814 void *dwp_file_ptr)
11816 struct dwp_file *dwp_file = (struct dwp_file *) dwp_file_ptr;
11817 const struct dwop_section_names *names = &dwop_section_names;
11818 unsigned int elf_section_nr = elf_section_data (sectp)->this_idx;
11820 /* Record the ELF section number for later lookup: this is what the
11821 .debug_cu_index,.debug_tu_index tables use in DWP V1. */
11822 gdb_assert (elf_section_nr < dwp_file->num_sections);
11823 dwp_file->elf_sections[elf_section_nr] = sectp;
11825 /* Look for specific sections that we need. */
11826 if (section_is_p (sectp->name, &names->str_dwo))
11828 dwp_file->sections.str.s.section = sectp;
11829 dwp_file->sections.str.size = bfd_get_section_size (sectp);
11831 else if (section_is_p (sectp->name, &names->cu_index))
11833 dwp_file->sections.cu_index.s.section = sectp;
11834 dwp_file->sections.cu_index.size = bfd_get_section_size (sectp);
11836 else if (section_is_p (sectp->name, &names->tu_index))
11838 dwp_file->sections.tu_index.s.section = sectp;
11839 dwp_file->sections.tu_index.size = bfd_get_section_size (sectp);
11843 /* This function is mapped across the sections and remembers the offset and
11844 size of each of the DWP version 2 debugging sections that we are interested
11845 in. This is split into a separate function because we don't know if we
11846 have version 1 or 2 until we parse the cu_index/tu_index sections. */
11849 dwarf2_locate_v2_dwp_sections (bfd *abfd, asection *sectp, void *dwp_file_ptr)
11851 struct dwp_file *dwp_file = (struct dwp_file *) dwp_file_ptr;
11852 const struct dwop_section_names *names = &dwop_section_names;
11853 unsigned int elf_section_nr = elf_section_data (sectp)->this_idx;
11855 /* Record the ELF section number for later lookup: this is what the
11856 .debug_cu_index,.debug_tu_index tables use in DWP V1. */
11857 gdb_assert (elf_section_nr < dwp_file->num_sections);
11858 dwp_file->elf_sections[elf_section_nr] = sectp;
11860 /* Look for specific sections that we need. */
11861 if (section_is_p (sectp->name, &names->abbrev_dwo))
11863 dwp_file->sections.abbrev.s.section = sectp;
11864 dwp_file->sections.abbrev.size = bfd_get_section_size (sectp);
11866 else if (section_is_p (sectp->name, &names->info_dwo))
11868 dwp_file->sections.info.s.section = sectp;
11869 dwp_file->sections.info.size = bfd_get_section_size (sectp);
11871 else if (section_is_p (sectp->name, &names->line_dwo))
11873 dwp_file->sections.line.s.section = sectp;
11874 dwp_file->sections.line.size = bfd_get_section_size (sectp);
11876 else if (section_is_p (sectp->name, &names->loc_dwo))
11878 dwp_file->sections.loc.s.section = sectp;
11879 dwp_file->sections.loc.size = bfd_get_section_size (sectp);
11881 else if (section_is_p (sectp->name, &names->macinfo_dwo))
11883 dwp_file->sections.macinfo.s.section = sectp;
11884 dwp_file->sections.macinfo.size = bfd_get_section_size (sectp);
11886 else if (section_is_p (sectp->name, &names->macro_dwo))
11888 dwp_file->sections.macro.s.section = sectp;
11889 dwp_file->sections.macro.size = bfd_get_section_size (sectp);
11891 else if (section_is_p (sectp->name, &names->str_offsets_dwo))
11893 dwp_file->sections.str_offsets.s.section = sectp;
11894 dwp_file->sections.str_offsets.size = bfd_get_section_size (sectp);
11896 else if (section_is_p (sectp->name, &names->types_dwo))
11898 dwp_file->sections.types.s.section = sectp;
11899 dwp_file->sections.types.size = bfd_get_section_size (sectp);
11903 /* Hash function for dwp_file loaded CUs/TUs. */
11906 hash_dwp_loaded_cutus (const void *item)
11908 const struct dwo_unit *dwo_unit = (const struct dwo_unit *) item;
11910 /* This drops the top 32 bits of the signature, but is ok for a hash. */
11911 return dwo_unit->signature;
11914 /* Equality function for dwp_file loaded CUs/TUs. */
11917 eq_dwp_loaded_cutus (const void *a, const void *b)
11919 const struct dwo_unit *dua = (const struct dwo_unit *) a;
11920 const struct dwo_unit *dub = (const struct dwo_unit *) b;
11922 return dua->signature == dub->signature;
11925 /* Allocate a hash table for dwp_file loaded CUs/TUs. */
11928 allocate_dwp_loaded_cutus_table (struct objfile *objfile)
11930 return htab_create_alloc_ex (3,
11931 hash_dwp_loaded_cutus,
11932 eq_dwp_loaded_cutus,
11934 &objfile->objfile_obstack,
11935 hashtab_obstack_allocate,
11936 dummy_obstack_deallocate);
11939 /* Try to open DWP file FILE_NAME.
11940 The result is the bfd handle of the file.
11941 If there is a problem finding or opening the file, return NULL.
11942 Upon success, the canonicalized path of the file is stored in the bfd,
11943 same as symfile_bfd_open. */
11945 static gdb_bfd_ref_ptr
11946 open_dwp_file (const char *file_name)
11948 gdb_bfd_ref_ptr abfd (try_open_dwop_file (file_name, 1 /*is_dwp*/,
11949 1 /*search_cwd*/));
11953 /* Work around upstream bug 15652.
11954 http://sourceware.org/bugzilla/show_bug.cgi?id=15652
11955 [Whether that's a "bug" is debatable, but it is getting in our way.]
11956 We have no real idea where the dwp file is, because gdb's realpath-ing
11957 of the executable's path may have discarded the needed info.
11958 [IWBN if the dwp file name was recorded in the executable, akin to
11959 .gnu_debuglink, but that doesn't exist yet.]
11960 Strip the directory from FILE_NAME and search again. */
11961 if (*debug_file_directory != '\0')
11963 /* Don't implicitly search the current directory here.
11964 If the user wants to search "." to handle this case,
11965 it must be added to debug-file-directory. */
11966 return try_open_dwop_file (lbasename (file_name), 1 /*is_dwp*/,
11973 /* Initialize the use of the DWP file for the current objfile.
11974 By convention the name of the DWP file is ${objfile}.dwp.
11975 The result is NULL if it can't be found. */
11977 static struct dwp_file *
11978 open_and_init_dwp_file (void)
11980 struct objfile *objfile = dwarf2_per_objfile->objfile;
11981 struct dwp_file *dwp_file;
11983 /* Try to find first .dwp for the binary file before any symbolic links
11986 /* If the objfile is a debug file, find the name of the real binary
11987 file and get the name of dwp file from there. */
11988 std::string dwp_name;
11989 if (objfile->separate_debug_objfile_backlink != NULL)
11991 struct objfile *backlink = objfile->separate_debug_objfile_backlink;
11992 const char *backlink_basename = lbasename (backlink->original_name);
11994 dwp_name = ldirname (objfile->original_name) + SLASH_STRING + backlink_basename;
11997 dwp_name = objfile->original_name;
11999 dwp_name += ".dwp";
12001 gdb_bfd_ref_ptr dbfd (open_dwp_file (dwp_name.c_str ()));
12003 && strcmp (objfile->original_name, objfile_name (objfile)) != 0)
12005 /* Try to find .dwp for the binary file after gdb_realpath resolving. */
12006 dwp_name = objfile_name (objfile);
12007 dwp_name += ".dwp";
12008 dbfd = open_dwp_file (dwp_name.c_str ());
12013 if (dwarf_read_debug)
12014 fprintf_unfiltered (gdb_stdlog, "DWP file not found: %s\n", dwp_name.c_str ());
12017 dwp_file = OBSTACK_ZALLOC (&objfile->objfile_obstack, struct dwp_file);
12018 dwp_file->name = bfd_get_filename (dbfd.get ());
12019 dwp_file->dbfd = dbfd.release ();
12021 /* +1: section 0 is unused */
12022 dwp_file->num_sections = bfd_count_sections (dwp_file->dbfd) + 1;
12023 dwp_file->elf_sections =
12024 OBSTACK_CALLOC (&objfile->objfile_obstack,
12025 dwp_file->num_sections, asection *);
12027 bfd_map_over_sections (dwp_file->dbfd, dwarf2_locate_common_dwp_sections,
12030 dwp_file->cus = create_dwp_hash_table (dwp_file, 0);
12032 dwp_file->tus = create_dwp_hash_table (dwp_file, 1);
12034 /* The DWP file version is stored in the hash table. Oh well. */
12035 if (dwp_file->cus && dwp_file->tus
12036 && dwp_file->cus->version != dwp_file->tus->version)
12038 /* Technically speaking, we should try to limp along, but this is
12039 pretty bizarre. We use pulongest here because that's the established
12040 portability solution (e.g, we cannot use %u for uint32_t). */
12041 error (_("Dwarf Error: DWP file CU version %s doesn't match"
12042 " TU version %s [in DWP file %s]"),
12043 pulongest (dwp_file->cus->version),
12044 pulongest (dwp_file->tus->version), dwp_name.c_str ());
12048 dwp_file->version = dwp_file->cus->version;
12049 else if (dwp_file->tus)
12050 dwp_file->version = dwp_file->tus->version;
12052 dwp_file->version = 2;
12054 if (dwp_file->version == 2)
12055 bfd_map_over_sections (dwp_file->dbfd, dwarf2_locate_v2_dwp_sections,
12058 dwp_file->loaded_cus = allocate_dwp_loaded_cutus_table (objfile);
12059 dwp_file->loaded_tus = allocate_dwp_loaded_cutus_table (objfile);
12061 if (dwarf_read_debug)
12063 fprintf_unfiltered (gdb_stdlog, "DWP file found: %s\n", dwp_file->name);
12064 fprintf_unfiltered (gdb_stdlog,
12065 " %s CUs, %s TUs\n",
12066 pulongest (dwp_file->cus ? dwp_file->cus->nr_units : 0),
12067 pulongest (dwp_file->tus ? dwp_file->tus->nr_units : 0));
12073 /* Wrapper around open_and_init_dwp_file, only open it once. */
12075 static struct dwp_file *
12076 get_dwp_file (void)
12078 if (! dwarf2_per_objfile->dwp_checked)
12080 dwarf2_per_objfile->dwp_file = open_and_init_dwp_file ();
12081 dwarf2_per_objfile->dwp_checked = 1;
12083 return dwarf2_per_objfile->dwp_file;
12086 /* Subroutine of lookup_dwo_comp_unit, lookup_dwo_type_unit.
12087 Look up the CU/TU with signature SIGNATURE, either in DWO file DWO_NAME
12088 or in the DWP file for the objfile, referenced by THIS_UNIT.
12089 If non-NULL, comp_dir is the DW_AT_comp_dir attribute.
12090 IS_DEBUG_TYPES is non-zero if reading a TU, otherwise read a CU.
12092 This is called, for example, when wanting to read a variable with a
12093 complex location. Therefore we don't want to do file i/o for every call.
12094 Therefore we don't want to look for a DWO file on every call.
12095 Therefore we first see if we've already seen SIGNATURE in a DWP file,
12096 then we check if we've already seen DWO_NAME, and only THEN do we check
12099 The result is a pointer to the dwo_unit object or NULL if we didn't find it
12100 (dwo_id mismatch or couldn't find the DWO/DWP file). */
12102 static struct dwo_unit *
12103 lookup_dwo_cutu (struct dwarf2_per_cu_data *this_unit,
12104 const char *dwo_name, const char *comp_dir,
12105 ULONGEST signature, int is_debug_types)
12107 struct objfile *objfile = dwarf2_per_objfile->objfile;
12108 const char *kind = is_debug_types ? "TU" : "CU";
12109 void **dwo_file_slot;
12110 struct dwo_file *dwo_file;
12111 struct dwp_file *dwp_file;
12113 /* First see if there's a DWP file.
12114 If we have a DWP file but didn't find the DWO inside it, don't
12115 look for the original DWO file. It makes gdb behave differently
12116 depending on whether one is debugging in the build tree. */
12118 dwp_file = get_dwp_file ();
12119 if (dwp_file != NULL)
12121 const struct dwp_hash_table *dwp_htab =
12122 is_debug_types ? dwp_file->tus : dwp_file->cus;
12124 if (dwp_htab != NULL)
12126 struct dwo_unit *dwo_cutu =
12127 lookup_dwo_unit_in_dwp (dwp_file, comp_dir,
12128 signature, is_debug_types);
12130 if (dwo_cutu != NULL)
12132 if (dwarf_read_debug)
12134 fprintf_unfiltered (gdb_stdlog,
12135 "Virtual DWO %s %s found: @%s\n",
12136 kind, hex_string (signature),
12137 host_address_to_string (dwo_cutu));
12145 /* No DWP file, look for the DWO file. */
12147 dwo_file_slot = lookup_dwo_file_slot (dwo_name, comp_dir);
12148 if (*dwo_file_slot == NULL)
12150 /* Read in the file and build a table of the CUs/TUs it contains. */
12151 *dwo_file_slot = open_and_init_dwo_file (this_unit, dwo_name, comp_dir);
12153 /* NOTE: This will be NULL if unable to open the file. */
12154 dwo_file = (struct dwo_file *) *dwo_file_slot;
12156 if (dwo_file != NULL)
12158 struct dwo_unit *dwo_cutu = NULL;
12160 if (is_debug_types && dwo_file->tus)
12162 struct dwo_unit find_dwo_cutu;
12164 memset (&find_dwo_cutu, 0, sizeof (find_dwo_cutu));
12165 find_dwo_cutu.signature = signature;
12167 = (struct dwo_unit *) htab_find (dwo_file->tus, &find_dwo_cutu);
12169 else if (!is_debug_types && dwo_file->cus)
12171 struct dwo_unit find_dwo_cutu;
12173 memset (&find_dwo_cutu, 0, sizeof (find_dwo_cutu));
12174 find_dwo_cutu.signature = signature;
12175 dwo_cutu = (struct dwo_unit *)htab_find (dwo_file->cus,
12179 if (dwo_cutu != NULL)
12181 if (dwarf_read_debug)
12183 fprintf_unfiltered (gdb_stdlog, "DWO %s %s(%s) found: @%s\n",
12184 kind, dwo_name, hex_string (signature),
12185 host_address_to_string (dwo_cutu));
12192 /* We didn't find it. This could mean a dwo_id mismatch, or
12193 someone deleted the DWO/DWP file, or the search path isn't set up
12194 correctly to find the file. */
12196 if (dwarf_read_debug)
12198 fprintf_unfiltered (gdb_stdlog, "DWO %s %s(%s) not found\n",
12199 kind, dwo_name, hex_string (signature));
12202 /* This is a warning and not a complaint because it can be caused by
12203 pilot error (e.g., user accidentally deleting the DWO). */
12205 /* Print the name of the DWP file if we looked there, helps the user
12206 better diagnose the problem. */
12207 std::string dwp_text;
12209 if (dwp_file != NULL)
12210 dwp_text = string_printf (" [in DWP file %s]",
12211 lbasename (dwp_file->name));
12213 warning (_("Could not find DWO %s %s(%s)%s referenced by %s at offset 0x%x"
12214 " [in module %s]"),
12215 kind, dwo_name, hex_string (signature),
12217 this_unit->is_debug_types ? "TU" : "CU",
12218 to_underlying (this_unit->sect_off), objfile_name (objfile));
12223 /* Lookup the DWO CU DWO_NAME/SIGNATURE referenced from THIS_CU.
12224 See lookup_dwo_cutu_unit for details. */
12226 static struct dwo_unit *
12227 lookup_dwo_comp_unit (struct dwarf2_per_cu_data *this_cu,
12228 const char *dwo_name, const char *comp_dir,
12229 ULONGEST signature)
12231 return lookup_dwo_cutu (this_cu, dwo_name, comp_dir, signature, 0);
12234 /* Lookup the DWO TU DWO_NAME/SIGNATURE referenced from THIS_TU.
12235 See lookup_dwo_cutu_unit for details. */
12237 static struct dwo_unit *
12238 lookup_dwo_type_unit (struct signatured_type *this_tu,
12239 const char *dwo_name, const char *comp_dir)
12241 return lookup_dwo_cutu (&this_tu->per_cu, dwo_name, comp_dir, this_tu->signature, 1);
12244 /* Traversal function for queue_and_load_all_dwo_tus. */
12247 queue_and_load_dwo_tu (void **slot, void *info)
12249 struct dwo_unit *dwo_unit = (struct dwo_unit *) *slot;
12250 struct dwarf2_per_cu_data *per_cu = (struct dwarf2_per_cu_data *) info;
12251 ULONGEST signature = dwo_unit->signature;
12252 struct signatured_type *sig_type =
12253 lookup_dwo_signatured_type (per_cu->cu, signature);
12255 if (sig_type != NULL)
12257 struct dwarf2_per_cu_data *sig_cu = &sig_type->per_cu;
12259 /* We pass NULL for DEPENDENT_CU because we don't yet know if there's
12260 a real dependency of PER_CU on SIG_TYPE. That is detected later
12261 while processing PER_CU. */
12262 if (maybe_queue_comp_unit (NULL, sig_cu, per_cu->cu->language))
12263 load_full_type_unit (sig_cu);
12264 VEC_safe_push (dwarf2_per_cu_ptr, per_cu->imported_symtabs, sig_cu);
12270 /* Queue all TUs contained in the DWO of PER_CU to be read in.
12271 The DWO may have the only definition of the type, though it may not be
12272 referenced anywhere in PER_CU. Thus we have to load *all* its TUs.
12273 http://sourceware.org/bugzilla/show_bug.cgi?id=15021 */
12276 queue_and_load_all_dwo_tus (struct dwarf2_per_cu_data *per_cu)
12278 struct dwo_unit *dwo_unit;
12279 struct dwo_file *dwo_file;
12281 gdb_assert (!per_cu->is_debug_types);
12282 gdb_assert (get_dwp_file () == NULL);
12283 gdb_assert (per_cu->cu != NULL);
12285 dwo_unit = per_cu->cu->dwo_unit;
12286 gdb_assert (dwo_unit != NULL);
12288 dwo_file = dwo_unit->dwo_file;
12289 if (dwo_file->tus != NULL)
12290 htab_traverse_noresize (dwo_file->tus, queue_and_load_dwo_tu, per_cu);
12293 /* Free all resources associated with DWO_FILE.
12294 Close the DWO file and munmap the sections.
12295 All memory should be on the objfile obstack. */
12298 free_dwo_file (struct dwo_file *dwo_file, struct objfile *objfile)
12301 /* Note: dbfd is NULL for virtual DWO files. */
12302 gdb_bfd_unref (dwo_file->dbfd);
12304 VEC_free (dwarf2_section_info_def, dwo_file->sections.types);
12307 /* Wrapper for free_dwo_file for use in cleanups. */
12310 free_dwo_file_cleanup (void *arg)
12312 struct dwo_file *dwo_file = (struct dwo_file *) arg;
12313 struct objfile *objfile = dwarf2_per_objfile->objfile;
12315 free_dwo_file (dwo_file, objfile);
12318 /* Traversal function for free_dwo_files. */
12321 free_dwo_file_from_slot (void **slot, void *info)
12323 struct dwo_file *dwo_file = (struct dwo_file *) *slot;
12324 struct objfile *objfile = (struct objfile *) info;
12326 free_dwo_file (dwo_file, objfile);
12331 /* Free all resources associated with DWO_FILES. */
12334 free_dwo_files (htab_t dwo_files, struct objfile *objfile)
12336 htab_traverse_noresize (dwo_files, free_dwo_file_from_slot, objfile);
12339 /* Read in various DIEs. */
12341 /* DW_AT_abstract_origin inherits whole DIEs (not just their attributes).
12342 Inherit only the children of the DW_AT_abstract_origin DIE not being
12343 already referenced by DW_AT_abstract_origin from the children of the
12347 inherit_abstract_dies (struct die_info *die, struct dwarf2_cu *cu)
12349 struct die_info *child_die;
12350 sect_offset *offsetp;
12351 /* Parent of DIE - referenced by DW_AT_abstract_origin. */
12352 struct die_info *origin_die;
12353 /* Iterator of the ORIGIN_DIE children. */
12354 struct die_info *origin_child_die;
12355 struct attribute *attr;
12356 struct dwarf2_cu *origin_cu;
12357 struct pending **origin_previous_list_in_scope;
12359 attr = dwarf2_attr (die, DW_AT_abstract_origin, cu);
12363 /* Note that following die references may follow to a die in a
12367 origin_die = follow_die_ref (die, attr, &origin_cu);
12369 /* We're inheriting ORIGIN's children into the scope we'd put DIE's
12371 origin_previous_list_in_scope = origin_cu->list_in_scope;
12372 origin_cu->list_in_scope = cu->list_in_scope;
12374 if (die->tag != origin_die->tag
12375 && !(die->tag == DW_TAG_inlined_subroutine
12376 && origin_die->tag == DW_TAG_subprogram))
12377 complaint (&symfile_complaints,
12378 _("DIE 0x%x and its abstract origin 0x%x have different tags"),
12379 to_underlying (die->sect_off),
12380 to_underlying (origin_die->sect_off));
12382 std::vector<sect_offset> offsets;
12384 for (child_die = die->child;
12385 child_die && child_die->tag;
12386 child_die = sibling_die (child_die))
12388 struct die_info *child_origin_die;
12389 struct dwarf2_cu *child_origin_cu;
12391 /* We are trying to process concrete instance entries:
12392 DW_TAG_call_site DIEs indeed have a DW_AT_abstract_origin tag, but
12393 it's not relevant to our analysis here. i.e. detecting DIEs that are
12394 present in the abstract instance but not referenced in the concrete
12396 if (child_die->tag == DW_TAG_call_site
12397 || child_die->tag == DW_TAG_GNU_call_site)
12400 /* For each CHILD_DIE, find the corresponding child of
12401 ORIGIN_DIE. If there is more than one layer of
12402 DW_AT_abstract_origin, follow them all; there shouldn't be,
12403 but GCC versions at least through 4.4 generate this (GCC PR
12405 child_origin_die = child_die;
12406 child_origin_cu = cu;
12409 attr = dwarf2_attr (child_origin_die, DW_AT_abstract_origin,
12413 child_origin_die = follow_die_ref (child_origin_die, attr,
12417 /* According to DWARF3 3.3.8.2 #3 new entries without their abstract
12418 counterpart may exist. */
12419 if (child_origin_die != child_die)
12421 if (child_die->tag != child_origin_die->tag
12422 && !(child_die->tag == DW_TAG_inlined_subroutine
12423 && child_origin_die->tag == DW_TAG_subprogram))
12424 complaint (&symfile_complaints,
12425 _("Child DIE 0x%x and its abstract origin 0x%x have "
12427 to_underlying (child_die->sect_off),
12428 to_underlying (child_origin_die->sect_off));
12429 if (child_origin_die->parent != origin_die)
12430 complaint (&symfile_complaints,
12431 _("Child DIE 0x%x and its abstract origin 0x%x have "
12432 "different parents"),
12433 to_underlying (child_die->sect_off),
12434 to_underlying (child_origin_die->sect_off));
12436 offsets.push_back (child_origin_die->sect_off);
12439 std::sort (offsets.begin (), offsets.end ());
12440 sect_offset *offsets_end = offsets.data () + offsets.size ();
12441 for (offsetp = offsets.data () + 1; offsetp < offsets_end; offsetp++)
12442 if (offsetp[-1] == *offsetp)
12443 complaint (&symfile_complaints,
12444 _("Multiple children of DIE 0x%x refer "
12445 "to DIE 0x%x as their abstract origin"),
12446 to_underlying (die->sect_off), to_underlying (*offsetp));
12448 offsetp = offsets.data ();
12449 origin_child_die = origin_die->child;
12450 while (origin_child_die && origin_child_die->tag)
12452 /* Is ORIGIN_CHILD_DIE referenced by any of the DIE children? */
12453 while (offsetp < offsets_end
12454 && *offsetp < origin_child_die->sect_off)
12456 if (offsetp >= offsets_end
12457 || *offsetp > origin_child_die->sect_off)
12459 /* Found that ORIGIN_CHILD_DIE is really not referenced.
12460 Check whether we're already processing ORIGIN_CHILD_DIE.
12461 This can happen with mutually referenced abstract_origins.
12463 if (!origin_child_die->in_process)
12464 process_die (origin_child_die, origin_cu);
12466 origin_child_die = sibling_die (origin_child_die);
12468 origin_cu->list_in_scope = origin_previous_list_in_scope;
12472 read_func_scope (struct die_info *die, struct dwarf2_cu *cu)
12474 struct objfile *objfile = cu->objfile;
12475 struct gdbarch *gdbarch = get_objfile_arch (objfile);
12476 struct context_stack *newobj;
12479 struct die_info *child_die;
12480 struct attribute *attr, *call_line, *call_file;
12482 CORE_ADDR baseaddr;
12483 struct block *block;
12484 int inlined_func = (die->tag == DW_TAG_inlined_subroutine);
12485 std::vector<struct symbol *> template_args;
12486 struct template_symbol *templ_func = NULL;
12490 /* If we do not have call site information, we can't show the
12491 caller of this inlined function. That's too confusing, so
12492 only use the scope for local variables. */
12493 call_line = dwarf2_attr (die, DW_AT_call_line, cu);
12494 call_file = dwarf2_attr (die, DW_AT_call_file, cu);
12495 if (call_line == NULL || call_file == NULL)
12497 read_lexical_block_scope (die, cu);
12502 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
12504 name = dwarf2_name (die, cu);
12506 /* Ignore functions with missing or empty names. These are actually
12507 illegal according to the DWARF standard. */
12510 complaint (&symfile_complaints,
12511 _("missing name for subprogram DIE at %d"),
12512 to_underlying (die->sect_off));
12516 /* Ignore functions with missing or invalid low and high pc attributes. */
12517 if (dwarf2_get_pc_bounds (die, &lowpc, &highpc, cu, NULL)
12518 <= PC_BOUNDS_INVALID)
12520 attr = dwarf2_attr (die, DW_AT_external, cu);
12521 if (!attr || !DW_UNSND (attr))
12522 complaint (&symfile_complaints,
12523 _("cannot get low and high bounds "
12524 "for subprogram DIE at %d"),
12525 to_underlying (die->sect_off));
12529 lowpc = gdbarch_adjust_dwarf2_addr (gdbarch, lowpc + baseaddr);
12530 highpc = gdbarch_adjust_dwarf2_addr (gdbarch, highpc + baseaddr);
12532 /* If we have any template arguments, then we must allocate a
12533 different sort of symbol. */
12534 for (child_die = die->child; child_die; child_die = sibling_die (child_die))
12536 if (child_die->tag == DW_TAG_template_type_param
12537 || child_die->tag == DW_TAG_template_value_param)
12539 templ_func = allocate_template_symbol (objfile);
12540 templ_func->subclass = SYMBOL_TEMPLATE;
12545 newobj = push_context (0, lowpc);
12546 newobj->name = new_symbol_full (die, read_type_die (die, cu), cu,
12547 (struct symbol *) templ_func);
12549 /* If there is a location expression for DW_AT_frame_base, record
12551 attr = dwarf2_attr (die, DW_AT_frame_base, cu);
12553 dwarf2_symbol_mark_computed (attr, newobj->name, cu, 1);
12555 /* If there is a location for the static link, record it. */
12556 newobj->static_link = NULL;
12557 attr = dwarf2_attr (die, DW_AT_static_link, cu);
12560 newobj->static_link
12561 = XOBNEW (&objfile->objfile_obstack, struct dynamic_prop);
12562 attr_to_dynamic_prop (attr, die, cu, newobj->static_link);
12565 cu->list_in_scope = &local_symbols;
12567 if (die->child != NULL)
12569 child_die = die->child;
12570 while (child_die && child_die->tag)
12572 if (child_die->tag == DW_TAG_template_type_param
12573 || child_die->tag == DW_TAG_template_value_param)
12575 struct symbol *arg = new_symbol (child_die, NULL, cu);
12578 template_args.push_back (arg);
12581 process_die (child_die, cu);
12582 child_die = sibling_die (child_die);
12586 inherit_abstract_dies (die, cu);
12588 /* If we have a DW_AT_specification, we might need to import using
12589 directives from the context of the specification DIE. See the
12590 comment in determine_prefix. */
12591 if (cu->language == language_cplus
12592 && dwarf2_attr (die, DW_AT_specification, cu))
12594 struct dwarf2_cu *spec_cu = cu;
12595 struct die_info *spec_die = die_specification (die, &spec_cu);
12599 child_die = spec_die->child;
12600 while (child_die && child_die->tag)
12602 if (child_die->tag == DW_TAG_imported_module)
12603 process_die (child_die, spec_cu);
12604 child_die = sibling_die (child_die);
12607 /* In some cases, GCC generates specification DIEs that
12608 themselves contain DW_AT_specification attributes. */
12609 spec_die = die_specification (spec_die, &spec_cu);
12613 newobj = pop_context ();
12614 /* Make a block for the local symbols within. */
12615 block = finish_block (newobj->name, &local_symbols, newobj->old_blocks,
12616 newobj->static_link, lowpc, highpc);
12618 /* For C++, set the block's scope. */
12619 if ((cu->language == language_cplus
12620 || cu->language == language_fortran
12621 || cu->language == language_d
12622 || cu->language == language_rust)
12623 && cu->processing_has_namespace_info)
12624 block_set_scope (block, determine_prefix (die, cu),
12625 &objfile->objfile_obstack);
12627 /* If we have address ranges, record them. */
12628 dwarf2_record_block_ranges (die, block, baseaddr, cu);
12630 gdbarch_make_symbol_special (gdbarch, newobj->name, objfile);
12632 /* Attach template arguments to function. */
12633 if (!template_args.empty ())
12635 gdb_assert (templ_func != NULL);
12637 templ_func->n_template_arguments = template_args.size ();
12638 templ_func->template_arguments
12639 = XOBNEWVEC (&objfile->objfile_obstack, struct symbol *,
12640 templ_func->n_template_arguments);
12641 memcpy (templ_func->template_arguments,
12642 template_args.data (),
12643 (templ_func->n_template_arguments * sizeof (struct symbol *)));
12646 /* In C++, we can have functions nested inside functions (e.g., when
12647 a function declares a class that has methods). This means that
12648 when we finish processing a function scope, we may need to go
12649 back to building a containing block's symbol lists. */
12650 local_symbols = newobj->locals;
12651 local_using_directives = newobj->local_using_directives;
12653 /* If we've finished processing a top-level function, subsequent
12654 symbols go in the file symbol list. */
12655 if (outermost_context_p ())
12656 cu->list_in_scope = &file_symbols;
12659 /* Process all the DIES contained within a lexical block scope. Start
12660 a new scope, process the dies, and then close the scope. */
12663 read_lexical_block_scope (struct die_info *die, struct dwarf2_cu *cu)
12665 struct objfile *objfile = cu->objfile;
12666 struct gdbarch *gdbarch = get_objfile_arch (objfile);
12667 struct context_stack *newobj;
12668 CORE_ADDR lowpc, highpc;
12669 struct die_info *child_die;
12670 CORE_ADDR baseaddr;
12672 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
12674 /* Ignore blocks with missing or invalid low and high pc attributes. */
12675 /* ??? Perhaps consider discontiguous blocks defined by DW_AT_ranges
12676 as multiple lexical blocks? Handling children in a sane way would
12677 be nasty. Might be easier to properly extend generic blocks to
12678 describe ranges. */
12679 switch (dwarf2_get_pc_bounds (die, &lowpc, &highpc, cu, NULL))
12681 case PC_BOUNDS_NOT_PRESENT:
12682 /* DW_TAG_lexical_block has no attributes, process its children as if
12683 there was no wrapping by that DW_TAG_lexical_block.
12684 GCC does no longer produces such DWARF since GCC r224161. */
12685 for (child_die = die->child;
12686 child_die != NULL && child_die->tag;
12687 child_die = sibling_die (child_die))
12688 process_die (child_die, cu);
12690 case PC_BOUNDS_INVALID:
12693 lowpc = gdbarch_adjust_dwarf2_addr (gdbarch, lowpc + baseaddr);
12694 highpc = gdbarch_adjust_dwarf2_addr (gdbarch, highpc + baseaddr);
12696 push_context (0, lowpc);
12697 if (die->child != NULL)
12699 child_die = die->child;
12700 while (child_die && child_die->tag)
12702 process_die (child_die, cu);
12703 child_die = sibling_die (child_die);
12706 inherit_abstract_dies (die, cu);
12707 newobj = pop_context ();
12709 if (local_symbols != NULL || local_using_directives != NULL)
12711 struct block *block
12712 = finish_block (0, &local_symbols, newobj->old_blocks, NULL,
12713 newobj->start_addr, highpc);
12715 /* Note that recording ranges after traversing children, as we
12716 do here, means that recording a parent's ranges entails
12717 walking across all its children's ranges as they appear in
12718 the address map, which is quadratic behavior.
12720 It would be nicer to record the parent's ranges before
12721 traversing its children, simply overriding whatever you find
12722 there. But since we don't even decide whether to create a
12723 block until after we've traversed its children, that's hard
12725 dwarf2_record_block_ranges (die, block, baseaddr, cu);
12727 local_symbols = newobj->locals;
12728 local_using_directives = newobj->local_using_directives;
12731 /* Read in DW_TAG_call_site and insert it to CU->call_site_htab. */
12734 read_call_site_scope (struct die_info *die, struct dwarf2_cu *cu)
12736 struct objfile *objfile = cu->objfile;
12737 struct gdbarch *gdbarch = get_objfile_arch (objfile);
12738 CORE_ADDR pc, baseaddr;
12739 struct attribute *attr;
12740 struct call_site *call_site, call_site_local;
12743 struct die_info *child_die;
12745 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
12747 attr = dwarf2_attr (die, DW_AT_call_return_pc, cu);
12750 /* This was a pre-DWARF-5 GNU extension alias
12751 for DW_AT_call_return_pc. */
12752 attr = dwarf2_attr (die, DW_AT_low_pc, cu);
12756 complaint (&symfile_complaints,
12757 _("missing DW_AT_call_return_pc for DW_TAG_call_site "
12758 "DIE 0x%x [in module %s]"),
12759 to_underlying (die->sect_off), objfile_name (objfile));
12762 pc = attr_value_as_address (attr) + baseaddr;
12763 pc = gdbarch_adjust_dwarf2_addr (gdbarch, pc);
12765 if (cu->call_site_htab == NULL)
12766 cu->call_site_htab = htab_create_alloc_ex (16, core_addr_hash, core_addr_eq,
12767 NULL, &objfile->objfile_obstack,
12768 hashtab_obstack_allocate, NULL);
12769 call_site_local.pc = pc;
12770 slot = htab_find_slot (cu->call_site_htab, &call_site_local, INSERT);
12773 complaint (&symfile_complaints,
12774 _("Duplicate PC %s for DW_TAG_call_site "
12775 "DIE 0x%x [in module %s]"),
12776 paddress (gdbarch, pc), to_underlying (die->sect_off),
12777 objfile_name (objfile));
12781 /* Count parameters at the caller. */
12784 for (child_die = die->child; child_die && child_die->tag;
12785 child_die = sibling_die (child_die))
12787 if (child_die->tag != DW_TAG_call_site_parameter
12788 && child_die->tag != DW_TAG_GNU_call_site_parameter)
12790 complaint (&symfile_complaints,
12791 _("Tag %d is not DW_TAG_call_site_parameter in "
12792 "DW_TAG_call_site child DIE 0x%x [in module %s]"),
12793 child_die->tag, to_underlying (child_die->sect_off),
12794 objfile_name (objfile));
12802 = ((struct call_site *)
12803 obstack_alloc (&objfile->objfile_obstack,
12804 sizeof (*call_site)
12805 + (sizeof (*call_site->parameter) * (nparams - 1))));
12807 memset (call_site, 0, sizeof (*call_site) - sizeof (*call_site->parameter));
12808 call_site->pc = pc;
12810 if (dwarf2_flag_true_p (die, DW_AT_call_tail_call, cu)
12811 || dwarf2_flag_true_p (die, DW_AT_GNU_tail_call, cu))
12813 struct die_info *func_die;
12815 /* Skip also over DW_TAG_inlined_subroutine. */
12816 for (func_die = die->parent;
12817 func_die && func_die->tag != DW_TAG_subprogram
12818 && func_die->tag != DW_TAG_subroutine_type;
12819 func_die = func_die->parent);
12821 /* DW_AT_call_all_calls is a superset
12822 of DW_AT_call_all_tail_calls. */
12824 && !dwarf2_flag_true_p (func_die, DW_AT_call_all_calls, cu)
12825 && !dwarf2_flag_true_p (func_die, DW_AT_GNU_all_call_sites, cu)
12826 && !dwarf2_flag_true_p (func_die, DW_AT_call_all_tail_calls, cu)
12827 && !dwarf2_flag_true_p (func_die, DW_AT_GNU_all_tail_call_sites, cu))
12829 /* TYPE_TAIL_CALL_LIST is not interesting in functions where it is
12830 not complete. But keep CALL_SITE for look ups via call_site_htab,
12831 both the initial caller containing the real return address PC and
12832 the final callee containing the current PC of a chain of tail
12833 calls do not need to have the tail call list complete. But any
12834 function candidate for a virtual tail call frame searched via
12835 TYPE_TAIL_CALL_LIST must have the tail call list complete to be
12836 determined unambiguously. */
12840 struct type *func_type = NULL;
12843 func_type = get_die_type (func_die, cu);
12844 if (func_type != NULL)
12846 gdb_assert (TYPE_CODE (func_type) == TYPE_CODE_FUNC);
12848 /* Enlist this call site to the function. */
12849 call_site->tail_call_next = TYPE_TAIL_CALL_LIST (func_type);
12850 TYPE_TAIL_CALL_LIST (func_type) = call_site;
12853 complaint (&symfile_complaints,
12854 _("Cannot find function owning DW_TAG_call_site "
12855 "DIE 0x%x [in module %s]"),
12856 to_underlying (die->sect_off), objfile_name (objfile));
12860 attr = dwarf2_attr (die, DW_AT_call_target, cu);
12862 attr = dwarf2_attr (die, DW_AT_GNU_call_site_target, cu);
12864 attr = dwarf2_attr (die, DW_AT_call_origin, cu);
12867 /* This was a pre-DWARF-5 GNU extension alias for DW_AT_call_origin. */
12868 attr = dwarf2_attr (die, DW_AT_abstract_origin, cu);
12870 SET_FIELD_DWARF_BLOCK (call_site->target, NULL);
12871 if (!attr || (attr_form_is_block (attr) && DW_BLOCK (attr)->size == 0))
12872 /* Keep NULL DWARF_BLOCK. */;
12873 else if (attr_form_is_block (attr))
12875 struct dwarf2_locexpr_baton *dlbaton;
12877 dlbaton = XOBNEW (&objfile->objfile_obstack, struct dwarf2_locexpr_baton);
12878 dlbaton->data = DW_BLOCK (attr)->data;
12879 dlbaton->size = DW_BLOCK (attr)->size;
12880 dlbaton->per_cu = cu->per_cu;
12882 SET_FIELD_DWARF_BLOCK (call_site->target, dlbaton);
12884 else if (attr_form_is_ref (attr))
12886 struct dwarf2_cu *target_cu = cu;
12887 struct die_info *target_die;
12889 target_die = follow_die_ref (die, attr, &target_cu);
12890 gdb_assert (target_cu->objfile == objfile);
12891 if (die_is_declaration (target_die, target_cu))
12893 const char *target_physname;
12895 /* Prefer the mangled name; otherwise compute the demangled one. */
12896 target_physname = dw2_linkage_name (target_die, target_cu);
12897 if (target_physname == NULL)
12898 target_physname = dwarf2_physname (NULL, target_die, target_cu);
12899 if (target_physname == NULL)
12900 complaint (&symfile_complaints,
12901 _("DW_AT_call_target target DIE has invalid "
12902 "physname, for referencing DIE 0x%x [in module %s]"),
12903 to_underlying (die->sect_off), objfile_name (objfile));
12905 SET_FIELD_PHYSNAME (call_site->target, target_physname);
12911 /* DW_AT_entry_pc should be preferred. */
12912 if (dwarf2_get_pc_bounds (target_die, &lowpc, NULL, target_cu, NULL)
12913 <= PC_BOUNDS_INVALID)
12914 complaint (&symfile_complaints,
12915 _("DW_AT_call_target target DIE has invalid "
12916 "low pc, for referencing DIE 0x%x [in module %s]"),
12917 to_underlying (die->sect_off), objfile_name (objfile));
12920 lowpc = gdbarch_adjust_dwarf2_addr (gdbarch, lowpc + baseaddr);
12921 SET_FIELD_PHYSADDR (call_site->target, lowpc);
12926 complaint (&symfile_complaints,
12927 _("DW_TAG_call_site DW_AT_call_target is neither "
12928 "block nor reference, for DIE 0x%x [in module %s]"),
12929 to_underlying (die->sect_off), objfile_name (objfile));
12931 call_site->per_cu = cu->per_cu;
12933 for (child_die = die->child;
12934 child_die && child_die->tag;
12935 child_die = sibling_die (child_die))
12937 struct call_site_parameter *parameter;
12938 struct attribute *loc, *origin;
12940 if (child_die->tag != DW_TAG_call_site_parameter
12941 && child_die->tag != DW_TAG_GNU_call_site_parameter)
12943 /* Already printed the complaint above. */
12947 gdb_assert (call_site->parameter_count < nparams);
12948 parameter = &call_site->parameter[call_site->parameter_count];
12950 /* DW_AT_location specifies the register number or DW_AT_abstract_origin
12951 specifies DW_TAG_formal_parameter. Value of the data assumed for the
12952 register is contained in DW_AT_call_value. */
12954 loc = dwarf2_attr (child_die, DW_AT_location, cu);
12955 origin = dwarf2_attr (child_die, DW_AT_call_parameter, cu);
12956 if (origin == NULL)
12958 /* This was a pre-DWARF-5 GNU extension alias
12959 for DW_AT_call_parameter. */
12960 origin = dwarf2_attr (child_die, DW_AT_abstract_origin, cu);
12962 if (loc == NULL && origin != NULL && attr_form_is_ref (origin))
12964 parameter->kind = CALL_SITE_PARAMETER_PARAM_OFFSET;
12966 sect_offset sect_off
12967 = (sect_offset) dwarf2_get_ref_die_offset (origin);
12968 if (!offset_in_cu_p (&cu->header, sect_off))
12970 /* As DW_OP_GNU_parameter_ref uses CU-relative offset this
12971 binding can be done only inside one CU. Such referenced DIE
12972 therefore cannot be even moved to DW_TAG_partial_unit. */
12973 complaint (&symfile_complaints,
12974 _("DW_AT_call_parameter offset is not in CU for "
12975 "DW_TAG_call_site child DIE 0x%x [in module %s]"),
12976 to_underlying (child_die->sect_off),
12977 objfile_name (objfile));
12980 parameter->u.param_cu_off
12981 = (cu_offset) (sect_off - cu->header.sect_off);
12983 else if (loc == NULL || origin != NULL || !attr_form_is_block (loc))
12985 complaint (&symfile_complaints,
12986 _("No DW_FORM_block* DW_AT_location for "
12987 "DW_TAG_call_site child DIE 0x%x [in module %s]"),
12988 to_underlying (child_die->sect_off), objfile_name (objfile));
12993 parameter->u.dwarf_reg = dwarf_block_to_dwarf_reg
12994 (DW_BLOCK (loc)->data, &DW_BLOCK (loc)->data[DW_BLOCK (loc)->size]);
12995 if (parameter->u.dwarf_reg != -1)
12996 parameter->kind = CALL_SITE_PARAMETER_DWARF_REG;
12997 else if (dwarf_block_to_sp_offset (gdbarch, DW_BLOCK (loc)->data,
12998 &DW_BLOCK (loc)->data[DW_BLOCK (loc)->size],
12999 ¶meter->u.fb_offset))
13000 parameter->kind = CALL_SITE_PARAMETER_FB_OFFSET;
13003 complaint (&symfile_complaints,
13004 _("Only single DW_OP_reg or DW_OP_fbreg is supported "
13005 "for DW_FORM_block* DW_AT_location is supported for "
13006 "DW_TAG_call_site child DIE 0x%x "
13008 to_underlying (child_die->sect_off),
13009 objfile_name (objfile));
13014 attr = dwarf2_attr (child_die, DW_AT_call_value, cu);
13016 attr = dwarf2_attr (child_die, DW_AT_GNU_call_site_value, cu);
13017 if (!attr_form_is_block (attr))
13019 complaint (&symfile_complaints,
13020 _("No DW_FORM_block* DW_AT_call_value for "
13021 "DW_TAG_call_site child DIE 0x%x [in module %s]"),
13022 to_underlying (child_die->sect_off),
13023 objfile_name (objfile));
13026 parameter->value = DW_BLOCK (attr)->data;
13027 parameter->value_size = DW_BLOCK (attr)->size;
13029 /* Parameters are not pre-cleared by memset above. */
13030 parameter->data_value = NULL;
13031 parameter->data_value_size = 0;
13032 call_site->parameter_count++;
13034 attr = dwarf2_attr (child_die, DW_AT_call_data_value, cu);
13036 attr = dwarf2_attr (child_die, DW_AT_GNU_call_site_data_value, cu);
13039 if (!attr_form_is_block (attr))
13040 complaint (&symfile_complaints,
13041 _("No DW_FORM_block* DW_AT_call_data_value for "
13042 "DW_TAG_call_site child DIE 0x%x [in module %s]"),
13043 to_underlying (child_die->sect_off),
13044 objfile_name (objfile));
13047 parameter->data_value = DW_BLOCK (attr)->data;
13048 parameter->data_value_size = DW_BLOCK (attr)->size;
13054 /* Helper function for read_variable. If DIE represents a virtual
13055 table, then return the type of the concrete object that is
13056 associated with the virtual table. Otherwise, return NULL. */
13058 static struct type *
13059 rust_containing_type (struct die_info *die, struct dwarf2_cu *cu)
13061 struct attribute *attr = dwarf2_attr (die, DW_AT_type, cu);
13065 /* Find the type DIE. */
13066 struct die_info *type_die = NULL;
13067 struct dwarf2_cu *type_cu = cu;
13069 if (attr_form_is_ref (attr))
13070 type_die = follow_die_ref (die, attr, &type_cu);
13071 if (type_die == NULL)
13074 if (dwarf2_attr (type_die, DW_AT_containing_type, type_cu) == NULL)
13076 return die_containing_type (type_die, type_cu);
13079 /* Read a variable (DW_TAG_variable) DIE and create a new symbol. */
13082 read_variable (struct die_info *die, struct dwarf2_cu *cu)
13084 struct rust_vtable_symbol *storage = NULL;
13086 if (cu->language == language_rust)
13088 struct type *containing_type = rust_containing_type (die, cu);
13090 if (containing_type != NULL)
13092 struct objfile *objfile = cu->objfile;
13094 storage = OBSTACK_ZALLOC (&objfile->objfile_obstack,
13095 struct rust_vtable_symbol);
13096 initialize_objfile_symbol (storage);
13097 storage->concrete_type = containing_type;
13098 storage->subclass = SYMBOL_RUST_VTABLE;
13102 new_symbol_full (die, NULL, cu, storage);
13105 /* Call CALLBACK from DW_AT_ranges attribute value OFFSET
13106 reading .debug_rnglists.
13107 Callback's type should be:
13108 void (CORE_ADDR range_beginning, CORE_ADDR range_end)
13109 Return true if the attributes are present and valid, otherwise,
13112 template <typename Callback>
13114 dwarf2_rnglists_process (unsigned offset, struct dwarf2_cu *cu,
13115 Callback &&callback)
13117 struct objfile *objfile = cu->objfile;
13118 struct gdbarch *gdbarch = get_objfile_arch (objfile);
13119 struct comp_unit_head *cu_header = &cu->header;
13120 bfd *obfd = objfile->obfd;
13121 unsigned int addr_size = cu_header->addr_size;
13122 CORE_ADDR mask = ~(~(CORE_ADDR)1 << (addr_size * 8 - 1));
13123 /* Base address selection entry. */
13126 unsigned int dummy;
13127 const gdb_byte *buffer;
13129 CORE_ADDR high = 0;
13130 CORE_ADDR baseaddr;
13131 bool overflow = false;
13133 found_base = cu->base_known;
13134 base = cu->base_address;
13136 dwarf2_read_section (objfile, &dwarf2_per_objfile->rnglists);
13137 if (offset >= dwarf2_per_objfile->rnglists.size)
13139 complaint (&symfile_complaints,
13140 _("Offset %d out of bounds for DW_AT_ranges attribute"),
13144 buffer = dwarf2_per_objfile->rnglists.buffer + offset;
13146 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
13150 /* Initialize it due to a false compiler warning. */
13151 CORE_ADDR range_beginning = 0, range_end = 0;
13152 const gdb_byte *buf_end = (dwarf2_per_objfile->rnglists.buffer
13153 + dwarf2_per_objfile->rnglists.size);
13154 unsigned int bytes_read;
13156 if (buffer == buf_end)
13161 const auto rlet = static_cast<enum dwarf_range_list_entry>(*buffer++);
13164 case DW_RLE_end_of_list:
13166 case DW_RLE_base_address:
13167 if (buffer + cu->header.addr_size > buf_end)
13172 base = read_address (obfd, buffer, cu, &bytes_read);
13174 buffer += bytes_read;
13176 case DW_RLE_start_length:
13177 if (buffer + cu->header.addr_size > buf_end)
13182 range_beginning = read_address (obfd, buffer, cu, &bytes_read);
13183 buffer += bytes_read;
13184 range_end = (range_beginning
13185 + read_unsigned_leb128 (obfd, buffer, &bytes_read));
13186 buffer += bytes_read;
13187 if (buffer > buf_end)
13193 case DW_RLE_offset_pair:
13194 range_beginning = read_unsigned_leb128 (obfd, buffer, &bytes_read);
13195 buffer += bytes_read;
13196 if (buffer > buf_end)
13201 range_end = read_unsigned_leb128 (obfd, buffer, &bytes_read);
13202 buffer += bytes_read;
13203 if (buffer > buf_end)
13209 case DW_RLE_start_end:
13210 if (buffer + 2 * cu->header.addr_size > buf_end)
13215 range_beginning = read_address (obfd, buffer, cu, &bytes_read);
13216 buffer += bytes_read;
13217 range_end = read_address (obfd, buffer, cu, &bytes_read);
13218 buffer += bytes_read;
13221 complaint (&symfile_complaints,
13222 _("Invalid .debug_rnglists data (no base address)"));
13225 if (rlet == DW_RLE_end_of_list || overflow)
13227 if (rlet == DW_RLE_base_address)
13232 /* We have no valid base address for the ranges
13234 complaint (&symfile_complaints,
13235 _("Invalid .debug_rnglists data (no base address)"));
13239 if (range_beginning > range_end)
13241 /* Inverted range entries are invalid. */
13242 complaint (&symfile_complaints,
13243 _("Invalid .debug_rnglists data (inverted range)"));
13247 /* Empty range entries have no effect. */
13248 if (range_beginning == range_end)
13251 range_beginning += base;
13254 /* A not-uncommon case of bad debug info.
13255 Don't pollute the addrmap with bad data. */
13256 if (range_beginning + baseaddr == 0
13257 && !dwarf2_per_objfile->has_section_at_zero)
13259 complaint (&symfile_complaints,
13260 _(".debug_rnglists entry has start address of zero"
13261 " [in module %s]"), objfile_name (objfile));
13265 callback (range_beginning, range_end);
13270 complaint (&symfile_complaints,
13271 _("Offset %d is not terminated "
13272 "for DW_AT_ranges attribute"),
13280 /* Call CALLBACK from DW_AT_ranges attribute value OFFSET reading .debug_ranges.
13281 Callback's type should be:
13282 void (CORE_ADDR range_beginning, CORE_ADDR range_end)
13283 Return 1 if the attributes are present and valid, otherwise, return 0. */
13285 template <typename Callback>
13287 dwarf2_ranges_process (unsigned offset, struct dwarf2_cu *cu,
13288 Callback &&callback)
13290 struct objfile *objfile = cu->objfile;
13291 struct gdbarch *gdbarch = get_objfile_arch (objfile);
13292 struct comp_unit_head *cu_header = &cu->header;
13293 bfd *obfd = objfile->obfd;
13294 unsigned int addr_size = cu_header->addr_size;
13295 CORE_ADDR mask = ~(~(CORE_ADDR)1 << (addr_size * 8 - 1));
13296 /* Base address selection entry. */
13299 unsigned int dummy;
13300 const gdb_byte *buffer;
13301 CORE_ADDR baseaddr;
13303 if (cu_header->version >= 5)
13304 return dwarf2_rnglists_process (offset, cu, callback);
13306 found_base = cu->base_known;
13307 base = cu->base_address;
13309 dwarf2_read_section (objfile, &dwarf2_per_objfile->ranges);
13310 if (offset >= dwarf2_per_objfile->ranges.size)
13312 complaint (&symfile_complaints,
13313 _("Offset %d out of bounds for DW_AT_ranges attribute"),
13317 buffer = dwarf2_per_objfile->ranges.buffer + offset;
13319 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
13323 CORE_ADDR range_beginning, range_end;
13325 range_beginning = read_address (obfd, buffer, cu, &dummy);
13326 buffer += addr_size;
13327 range_end = read_address (obfd, buffer, cu, &dummy);
13328 buffer += addr_size;
13329 offset += 2 * addr_size;
13331 /* An end of list marker is a pair of zero addresses. */
13332 if (range_beginning == 0 && range_end == 0)
13333 /* Found the end of list entry. */
13336 /* Each base address selection entry is a pair of 2 values.
13337 The first is the largest possible address, the second is
13338 the base address. Check for a base address here. */
13339 if ((range_beginning & mask) == mask)
13341 /* If we found the largest possible address, then we already
13342 have the base address in range_end. */
13350 /* We have no valid base address for the ranges
13352 complaint (&symfile_complaints,
13353 _("Invalid .debug_ranges data (no base address)"));
13357 if (range_beginning > range_end)
13359 /* Inverted range entries are invalid. */
13360 complaint (&symfile_complaints,
13361 _("Invalid .debug_ranges data (inverted range)"));
13365 /* Empty range entries have no effect. */
13366 if (range_beginning == range_end)
13369 range_beginning += base;
13372 /* A not-uncommon case of bad debug info.
13373 Don't pollute the addrmap with bad data. */
13374 if (range_beginning + baseaddr == 0
13375 && !dwarf2_per_objfile->has_section_at_zero)
13377 complaint (&symfile_complaints,
13378 _(".debug_ranges entry has start address of zero"
13379 " [in module %s]"), objfile_name (objfile));
13383 callback (range_beginning, range_end);
13389 /* Get low and high pc attributes from DW_AT_ranges attribute value OFFSET.
13390 Return 1 if the attributes are present and valid, otherwise, return 0.
13391 If RANGES_PST is not NULL we should setup `objfile->psymtabs_addrmap'. */
13394 dwarf2_ranges_read (unsigned offset, CORE_ADDR *low_return,
13395 CORE_ADDR *high_return, struct dwarf2_cu *cu,
13396 struct partial_symtab *ranges_pst)
13398 struct objfile *objfile = cu->objfile;
13399 struct gdbarch *gdbarch = get_objfile_arch (objfile);
13400 const CORE_ADDR baseaddr = ANOFFSET (objfile->section_offsets,
13401 SECT_OFF_TEXT (objfile));
13404 CORE_ADDR high = 0;
13407 retval = dwarf2_ranges_process (offset, cu,
13408 [&] (CORE_ADDR range_beginning, CORE_ADDR range_end)
13410 if (ranges_pst != NULL)
13415 lowpc = gdbarch_adjust_dwarf2_addr (gdbarch,
13416 range_beginning + baseaddr);
13417 highpc = gdbarch_adjust_dwarf2_addr (gdbarch,
13418 range_end + baseaddr);
13419 addrmap_set_empty (objfile->psymtabs_addrmap, lowpc, highpc - 1,
13423 /* FIXME: This is recording everything as a low-high
13424 segment of consecutive addresses. We should have a
13425 data structure for discontiguous block ranges
13429 low = range_beginning;
13435 if (range_beginning < low)
13436 low = range_beginning;
13437 if (range_end > high)
13445 /* If the first entry is an end-of-list marker, the range
13446 describes an empty scope, i.e. no instructions. */
13452 *high_return = high;
13456 /* Get low and high pc attributes from a die. See enum pc_bounds_kind
13457 definition for the return value. *LOWPC and *HIGHPC are set iff
13458 neither PC_BOUNDS_NOT_PRESENT nor PC_BOUNDS_INVALID are returned. */
13460 static enum pc_bounds_kind
13461 dwarf2_get_pc_bounds (struct die_info *die, CORE_ADDR *lowpc,
13462 CORE_ADDR *highpc, struct dwarf2_cu *cu,
13463 struct partial_symtab *pst)
13465 struct attribute *attr;
13466 struct attribute *attr_high;
13468 CORE_ADDR high = 0;
13469 enum pc_bounds_kind ret;
13471 attr_high = dwarf2_attr (die, DW_AT_high_pc, cu);
13474 attr = dwarf2_attr (die, DW_AT_low_pc, cu);
13477 low = attr_value_as_address (attr);
13478 high = attr_value_as_address (attr_high);
13479 if (cu->header.version >= 4 && attr_form_is_constant (attr_high))
13483 /* Found high w/o low attribute. */
13484 return PC_BOUNDS_INVALID;
13486 /* Found consecutive range of addresses. */
13487 ret = PC_BOUNDS_HIGH_LOW;
13491 attr = dwarf2_attr (die, DW_AT_ranges, cu);
13494 /* DW_AT_ranges_base does not apply to DIEs from the DWO skeleton.
13495 We take advantage of the fact that DW_AT_ranges does not appear
13496 in DW_TAG_compile_unit of DWO files. */
13497 int need_ranges_base = die->tag != DW_TAG_compile_unit;
13498 unsigned int ranges_offset = (DW_UNSND (attr)
13499 + (need_ranges_base
13503 /* Value of the DW_AT_ranges attribute is the offset in the
13504 .debug_ranges section. */
13505 if (!dwarf2_ranges_read (ranges_offset, &low, &high, cu, pst))
13506 return PC_BOUNDS_INVALID;
13507 /* Found discontinuous range of addresses. */
13508 ret = PC_BOUNDS_RANGES;
13511 return PC_BOUNDS_NOT_PRESENT;
13514 /* read_partial_die has also the strict LOW < HIGH requirement. */
13516 return PC_BOUNDS_INVALID;
13518 /* When using the GNU linker, .gnu.linkonce. sections are used to
13519 eliminate duplicate copies of functions and vtables and such.
13520 The linker will arbitrarily choose one and discard the others.
13521 The AT_*_pc values for such functions refer to local labels in
13522 these sections. If the section from that file was discarded, the
13523 labels are not in the output, so the relocs get a value of 0.
13524 If this is a discarded function, mark the pc bounds as invalid,
13525 so that GDB will ignore it. */
13526 if (low == 0 && !dwarf2_per_objfile->has_section_at_zero)
13527 return PC_BOUNDS_INVALID;
13535 /* Assuming that DIE represents a subprogram DIE or a lexical block, get
13536 its low and high PC addresses. Do nothing if these addresses could not
13537 be determined. Otherwise, set LOWPC to the low address if it is smaller,
13538 and HIGHPC to the high address if greater than HIGHPC. */
13541 dwarf2_get_subprogram_pc_bounds (struct die_info *die,
13542 CORE_ADDR *lowpc, CORE_ADDR *highpc,
13543 struct dwarf2_cu *cu)
13545 CORE_ADDR low, high;
13546 struct die_info *child = die->child;
13548 if (dwarf2_get_pc_bounds (die, &low, &high, cu, NULL) >= PC_BOUNDS_RANGES)
13550 *lowpc = std::min (*lowpc, low);
13551 *highpc = std::max (*highpc, high);
13554 /* If the language does not allow nested subprograms (either inside
13555 subprograms or lexical blocks), we're done. */
13556 if (cu->language != language_ada)
13559 /* Check all the children of the given DIE. If it contains nested
13560 subprograms, then check their pc bounds. Likewise, we need to
13561 check lexical blocks as well, as they may also contain subprogram
13563 while (child && child->tag)
13565 if (child->tag == DW_TAG_subprogram
13566 || child->tag == DW_TAG_lexical_block)
13567 dwarf2_get_subprogram_pc_bounds (child, lowpc, highpc, cu);
13568 child = sibling_die (child);
13572 /* Get the low and high pc's represented by the scope DIE, and store
13573 them in *LOWPC and *HIGHPC. If the correct values can't be
13574 determined, set *LOWPC to -1 and *HIGHPC to 0. */
13577 get_scope_pc_bounds (struct die_info *die,
13578 CORE_ADDR *lowpc, CORE_ADDR *highpc,
13579 struct dwarf2_cu *cu)
13581 CORE_ADDR best_low = (CORE_ADDR) -1;
13582 CORE_ADDR best_high = (CORE_ADDR) 0;
13583 CORE_ADDR current_low, current_high;
13585 if (dwarf2_get_pc_bounds (die, ¤t_low, ¤t_high, cu, NULL)
13586 >= PC_BOUNDS_RANGES)
13588 best_low = current_low;
13589 best_high = current_high;
13593 struct die_info *child = die->child;
13595 while (child && child->tag)
13597 switch (child->tag) {
13598 case DW_TAG_subprogram:
13599 dwarf2_get_subprogram_pc_bounds (child, &best_low, &best_high, cu);
13601 case DW_TAG_namespace:
13602 case DW_TAG_module:
13603 /* FIXME: carlton/2004-01-16: Should we do this for
13604 DW_TAG_class_type/DW_TAG_structure_type, too? I think
13605 that current GCC's always emit the DIEs corresponding
13606 to definitions of methods of classes as children of a
13607 DW_TAG_compile_unit or DW_TAG_namespace (as opposed to
13608 the DIEs giving the declarations, which could be
13609 anywhere). But I don't see any reason why the
13610 standards says that they have to be there. */
13611 get_scope_pc_bounds (child, ¤t_low, ¤t_high, cu);
13613 if (current_low != ((CORE_ADDR) -1))
13615 best_low = std::min (best_low, current_low);
13616 best_high = std::max (best_high, current_high);
13624 child = sibling_die (child);
13629 *highpc = best_high;
13632 /* Record the address ranges for BLOCK, offset by BASEADDR, as given
13636 dwarf2_record_block_ranges (struct die_info *die, struct block *block,
13637 CORE_ADDR baseaddr, struct dwarf2_cu *cu)
13639 struct objfile *objfile = cu->objfile;
13640 struct gdbarch *gdbarch = get_objfile_arch (objfile);
13641 struct attribute *attr;
13642 struct attribute *attr_high;
13644 attr_high = dwarf2_attr (die, DW_AT_high_pc, cu);
13647 attr = dwarf2_attr (die, DW_AT_low_pc, cu);
13650 CORE_ADDR low = attr_value_as_address (attr);
13651 CORE_ADDR high = attr_value_as_address (attr_high);
13653 if (cu->header.version >= 4 && attr_form_is_constant (attr_high))
13656 low = gdbarch_adjust_dwarf2_addr (gdbarch, low + baseaddr);
13657 high = gdbarch_adjust_dwarf2_addr (gdbarch, high + baseaddr);
13658 record_block_range (block, low, high - 1);
13662 attr = dwarf2_attr (die, DW_AT_ranges, cu);
13665 bfd *obfd = objfile->obfd;
13666 /* DW_AT_ranges_base does not apply to DIEs from the DWO skeleton.
13667 We take advantage of the fact that DW_AT_ranges does not appear
13668 in DW_TAG_compile_unit of DWO files. */
13669 int need_ranges_base = die->tag != DW_TAG_compile_unit;
13671 /* The value of the DW_AT_ranges attribute is the offset of the
13672 address range list in the .debug_ranges section. */
13673 unsigned long offset = (DW_UNSND (attr)
13674 + (need_ranges_base ? cu->ranges_base : 0));
13675 const gdb_byte *buffer;
13677 /* For some target architectures, but not others, the
13678 read_address function sign-extends the addresses it returns.
13679 To recognize base address selection entries, we need a
13681 unsigned int addr_size = cu->header.addr_size;
13682 CORE_ADDR base_select_mask = ~(~(CORE_ADDR)1 << (addr_size * 8 - 1));
13684 /* The base address, to which the next pair is relative. Note
13685 that this 'base' is a DWARF concept: most entries in a range
13686 list are relative, to reduce the number of relocs against the
13687 debugging information. This is separate from this function's
13688 'baseaddr' argument, which GDB uses to relocate debugging
13689 information from a shared library based on the address at
13690 which the library was loaded. */
13691 CORE_ADDR base = cu->base_address;
13692 int base_known = cu->base_known;
13694 dwarf2_ranges_process (offset, cu,
13695 [&] (CORE_ADDR start, CORE_ADDR end)
13699 start = gdbarch_adjust_dwarf2_addr (gdbarch, start);
13700 end = gdbarch_adjust_dwarf2_addr (gdbarch, end);
13701 record_block_range (block, start, end - 1);
13706 /* Check whether the producer field indicates either of GCC < 4.6, or the
13707 Intel C/C++ compiler, and cache the result in CU. */
13710 check_producer (struct dwarf2_cu *cu)
13714 if (cu->producer == NULL)
13716 /* For unknown compilers expect their behavior is DWARF version
13719 GCC started to support .debug_types sections by -gdwarf-4 since
13720 gcc-4.5.x. As the .debug_types sections are missing DW_AT_producer
13721 for their space efficiency GDB cannot workaround gcc-4.5.x -gdwarf-4
13722 combination. gcc-4.5.x -gdwarf-4 binaries have DW_AT_accessibility
13723 interpreted incorrectly by GDB now - GCC PR debug/48229. */
13725 else if (producer_is_gcc (cu->producer, &major, &minor))
13727 cu->producer_is_gxx_lt_4_6 = major < 4 || (major == 4 && minor < 6);
13728 cu->producer_is_gcc_lt_4_3 = major < 4 || (major == 4 && minor < 3);
13730 else if (producer_is_icc (cu->producer, &major, &minor))
13731 cu->producer_is_icc_lt_14 = major < 14;
13734 /* For other non-GCC compilers, expect their behavior is DWARF version
13738 cu->checked_producer = 1;
13741 /* Check for GCC PR debug/45124 fix which is not present in any G++ version up
13742 to 4.5.any while it is present already in G++ 4.6.0 - the PR has been fixed
13743 during 4.6.0 experimental. */
13746 producer_is_gxx_lt_4_6 (struct dwarf2_cu *cu)
13748 if (!cu->checked_producer)
13749 check_producer (cu);
13751 return cu->producer_is_gxx_lt_4_6;
13754 /* Return the default accessibility type if it is not overriden by
13755 DW_AT_accessibility. */
13757 static enum dwarf_access_attribute
13758 dwarf2_default_access_attribute (struct die_info *die, struct dwarf2_cu *cu)
13760 if (cu->header.version < 3 || producer_is_gxx_lt_4_6 (cu))
13762 /* The default DWARF 2 accessibility for members is public, the default
13763 accessibility for inheritance is private. */
13765 if (die->tag != DW_TAG_inheritance)
13766 return DW_ACCESS_public;
13768 return DW_ACCESS_private;
13772 /* DWARF 3+ defines the default accessibility a different way. The same
13773 rules apply now for DW_TAG_inheritance as for the members and it only
13774 depends on the container kind. */
13776 if (die->parent->tag == DW_TAG_class_type)
13777 return DW_ACCESS_private;
13779 return DW_ACCESS_public;
13783 /* Look for DW_AT_data_member_location. Set *OFFSET to the byte
13784 offset. If the attribute was not found return 0, otherwise return
13785 1. If it was found but could not properly be handled, set *OFFSET
13789 handle_data_member_location (struct die_info *die, struct dwarf2_cu *cu,
13792 struct attribute *attr;
13794 attr = dwarf2_attr (die, DW_AT_data_member_location, cu);
13799 /* Note that we do not check for a section offset first here.
13800 This is because DW_AT_data_member_location is new in DWARF 4,
13801 so if we see it, we can assume that a constant form is really
13802 a constant and not a section offset. */
13803 if (attr_form_is_constant (attr))
13804 *offset = dwarf2_get_attr_constant_value (attr, 0);
13805 else if (attr_form_is_section_offset (attr))
13806 dwarf2_complex_location_expr_complaint ();
13807 else if (attr_form_is_block (attr))
13808 *offset = decode_locdesc (DW_BLOCK (attr), cu);
13810 dwarf2_complex_location_expr_complaint ();
13818 /* Add an aggregate field to the field list. */
13821 dwarf2_add_field (struct field_info *fip, struct die_info *die,
13822 struct dwarf2_cu *cu)
13824 struct objfile *objfile = cu->objfile;
13825 struct gdbarch *gdbarch = get_objfile_arch (objfile);
13826 struct nextfield *new_field;
13827 struct attribute *attr;
13829 const char *fieldname = "";
13831 /* Allocate a new field list entry and link it in. */
13832 new_field = XNEW (struct nextfield);
13833 make_cleanup (xfree, new_field);
13834 memset (new_field, 0, sizeof (struct nextfield));
13836 if (die->tag == DW_TAG_inheritance)
13838 new_field->next = fip->baseclasses;
13839 fip->baseclasses = new_field;
13843 new_field->next = fip->fields;
13844 fip->fields = new_field;
13848 attr = dwarf2_attr (die, DW_AT_accessibility, cu);
13850 new_field->accessibility = DW_UNSND (attr);
13852 new_field->accessibility = dwarf2_default_access_attribute (die, cu);
13853 if (new_field->accessibility != DW_ACCESS_public)
13854 fip->non_public_fields = 1;
13856 attr = dwarf2_attr (die, DW_AT_virtuality, cu);
13858 new_field->virtuality = DW_UNSND (attr);
13860 new_field->virtuality = DW_VIRTUALITY_none;
13862 fp = &new_field->field;
13864 if (die->tag == DW_TAG_member && ! die_is_declaration (die, cu))
13868 /* Data member other than a C++ static data member. */
13870 /* Get type of field. */
13871 fp->type = die_type (die, cu);
13873 SET_FIELD_BITPOS (*fp, 0);
13875 /* Get bit size of field (zero if none). */
13876 attr = dwarf2_attr (die, DW_AT_bit_size, cu);
13879 FIELD_BITSIZE (*fp) = DW_UNSND (attr);
13883 FIELD_BITSIZE (*fp) = 0;
13886 /* Get bit offset of field. */
13887 if (handle_data_member_location (die, cu, &offset))
13888 SET_FIELD_BITPOS (*fp, offset * bits_per_byte);
13889 attr = dwarf2_attr (die, DW_AT_bit_offset, cu);
13892 if (gdbarch_bits_big_endian (gdbarch))
13894 /* For big endian bits, the DW_AT_bit_offset gives the
13895 additional bit offset from the MSB of the containing
13896 anonymous object to the MSB of the field. We don't
13897 have to do anything special since we don't need to
13898 know the size of the anonymous object. */
13899 SET_FIELD_BITPOS (*fp, FIELD_BITPOS (*fp) + DW_UNSND (attr));
13903 /* For little endian bits, compute the bit offset to the
13904 MSB of the anonymous object, subtract off the number of
13905 bits from the MSB of the field to the MSB of the
13906 object, and then subtract off the number of bits of
13907 the field itself. The result is the bit offset of
13908 the LSB of the field. */
13909 int anonymous_size;
13910 int bit_offset = DW_UNSND (attr);
13912 attr = dwarf2_attr (die, DW_AT_byte_size, cu);
13915 /* The size of the anonymous object containing
13916 the bit field is explicit, so use the
13917 indicated size (in bytes). */
13918 anonymous_size = DW_UNSND (attr);
13922 /* The size of the anonymous object containing
13923 the bit field must be inferred from the type
13924 attribute of the data member containing the
13926 anonymous_size = TYPE_LENGTH (fp->type);
13928 SET_FIELD_BITPOS (*fp,
13929 (FIELD_BITPOS (*fp)
13930 + anonymous_size * bits_per_byte
13931 - bit_offset - FIELD_BITSIZE (*fp)));
13934 attr = dwarf2_attr (die, DW_AT_data_bit_offset, cu);
13936 SET_FIELD_BITPOS (*fp, (FIELD_BITPOS (*fp)
13937 + dwarf2_get_attr_constant_value (attr, 0)));
13939 /* Get name of field. */
13940 fieldname = dwarf2_name (die, cu);
13941 if (fieldname == NULL)
13944 /* The name is already allocated along with this objfile, so we don't
13945 need to duplicate it for the type. */
13946 fp->name = fieldname;
13948 /* Change accessibility for artificial fields (e.g. virtual table
13949 pointer or virtual base class pointer) to private. */
13950 if (dwarf2_attr (die, DW_AT_artificial, cu))
13952 FIELD_ARTIFICIAL (*fp) = 1;
13953 new_field->accessibility = DW_ACCESS_private;
13954 fip->non_public_fields = 1;
13957 else if (die->tag == DW_TAG_member || die->tag == DW_TAG_variable)
13959 /* C++ static member. */
13961 /* NOTE: carlton/2002-11-05: It should be a DW_TAG_member that
13962 is a declaration, but all versions of G++ as of this writing
13963 (so through at least 3.2.1) incorrectly generate
13964 DW_TAG_variable tags. */
13966 const char *physname;
13968 /* Get name of field. */
13969 fieldname = dwarf2_name (die, cu);
13970 if (fieldname == NULL)
13973 attr = dwarf2_attr (die, DW_AT_const_value, cu);
13975 /* Only create a symbol if this is an external value.
13976 new_symbol checks this and puts the value in the global symbol
13977 table, which we want. If it is not external, new_symbol
13978 will try to put the value in cu->list_in_scope which is wrong. */
13979 && dwarf2_flag_true_p (die, DW_AT_external, cu))
13981 /* A static const member, not much different than an enum as far as
13982 we're concerned, except that we can support more types. */
13983 new_symbol (die, NULL, cu);
13986 /* Get physical name. */
13987 physname = dwarf2_physname (fieldname, die, cu);
13989 /* The name is already allocated along with this objfile, so we don't
13990 need to duplicate it for the type. */
13991 SET_FIELD_PHYSNAME (*fp, physname ? physname : "");
13992 FIELD_TYPE (*fp) = die_type (die, cu);
13993 FIELD_NAME (*fp) = fieldname;
13995 else if (die->tag == DW_TAG_inheritance)
13999 /* C++ base class field. */
14000 if (handle_data_member_location (die, cu, &offset))
14001 SET_FIELD_BITPOS (*fp, offset * bits_per_byte);
14002 FIELD_BITSIZE (*fp) = 0;
14003 FIELD_TYPE (*fp) = die_type (die, cu);
14004 FIELD_NAME (*fp) = type_name_no_tag (fp->type);
14005 fip->nbaseclasses++;
14009 /* Add a typedef defined in the scope of the FIP's class. */
14012 dwarf2_add_typedef (struct field_info *fip, struct die_info *die,
14013 struct dwarf2_cu *cu)
14015 struct typedef_field_list *new_field;
14016 struct typedef_field *fp;
14018 /* Allocate a new field list entry and link it in. */
14019 new_field = XCNEW (struct typedef_field_list);
14020 make_cleanup (xfree, new_field);
14022 gdb_assert (die->tag == DW_TAG_typedef);
14024 fp = &new_field->field;
14026 /* Get name of field. */
14027 fp->name = dwarf2_name (die, cu);
14028 if (fp->name == NULL)
14031 fp->type = read_type_die (die, cu);
14033 /* Save accessibility. */
14034 enum dwarf_access_attribute accessibility;
14035 struct attribute *attr = dwarf2_attr (die, DW_AT_accessibility, cu);
14037 accessibility = (enum dwarf_access_attribute) DW_UNSND (attr);
14039 accessibility = dwarf2_default_access_attribute (die, cu);
14040 switch (accessibility)
14042 case DW_ACCESS_public:
14043 /* The assumed value if neither private nor protected. */
14045 case DW_ACCESS_private:
14046 fp->is_private = 1;
14048 case DW_ACCESS_protected:
14049 fp->is_protected = 1;
14052 complaint (&symfile_complaints,
14053 _("Unhandled DW_AT_accessibility value (%x)"), accessibility);
14056 new_field->next = fip->typedef_field_list;
14057 fip->typedef_field_list = new_field;
14058 fip->typedef_field_list_count++;
14061 /* Create the vector of fields, and attach it to the type. */
14064 dwarf2_attach_fields_to_type (struct field_info *fip, struct type *type,
14065 struct dwarf2_cu *cu)
14067 int nfields = fip->nfields;
14069 /* Record the field count, allocate space for the array of fields,
14070 and create blank accessibility bitfields if necessary. */
14071 TYPE_NFIELDS (type) = nfields;
14072 TYPE_FIELDS (type) = (struct field *)
14073 TYPE_ALLOC (type, sizeof (struct field) * nfields);
14074 memset (TYPE_FIELDS (type), 0, sizeof (struct field) * nfields);
14076 if (fip->non_public_fields && cu->language != language_ada)
14078 ALLOCATE_CPLUS_STRUCT_TYPE (type);
14080 TYPE_FIELD_PRIVATE_BITS (type) =
14081 (B_TYPE *) TYPE_ALLOC (type, B_BYTES (nfields));
14082 B_CLRALL (TYPE_FIELD_PRIVATE_BITS (type), nfields);
14084 TYPE_FIELD_PROTECTED_BITS (type) =
14085 (B_TYPE *) TYPE_ALLOC (type, B_BYTES (nfields));
14086 B_CLRALL (TYPE_FIELD_PROTECTED_BITS (type), nfields);
14088 TYPE_FIELD_IGNORE_BITS (type) =
14089 (B_TYPE *) TYPE_ALLOC (type, B_BYTES (nfields));
14090 B_CLRALL (TYPE_FIELD_IGNORE_BITS (type), nfields);
14093 /* If the type has baseclasses, allocate and clear a bit vector for
14094 TYPE_FIELD_VIRTUAL_BITS. */
14095 if (fip->nbaseclasses && cu->language != language_ada)
14097 int num_bytes = B_BYTES (fip->nbaseclasses);
14098 unsigned char *pointer;
14100 ALLOCATE_CPLUS_STRUCT_TYPE (type);
14101 pointer = (unsigned char *) TYPE_ALLOC (type, num_bytes);
14102 TYPE_FIELD_VIRTUAL_BITS (type) = pointer;
14103 B_CLRALL (TYPE_FIELD_VIRTUAL_BITS (type), fip->nbaseclasses);
14104 TYPE_N_BASECLASSES (type) = fip->nbaseclasses;
14107 /* Copy the saved-up fields into the field vector. Start from the head of
14108 the list, adding to the tail of the field array, so that they end up in
14109 the same order in the array in which they were added to the list. */
14110 while (nfields-- > 0)
14112 struct nextfield *fieldp;
14116 fieldp = fip->fields;
14117 fip->fields = fieldp->next;
14121 fieldp = fip->baseclasses;
14122 fip->baseclasses = fieldp->next;
14125 TYPE_FIELD (type, nfields) = fieldp->field;
14126 switch (fieldp->accessibility)
14128 case DW_ACCESS_private:
14129 if (cu->language != language_ada)
14130 SET_TYPE_FIELD_PRIVATE (type, nfields);
14133 case DW_ACCESS_protected:
14134 if (cu->language != language_ada)
14135 SET_TYPE_FIELD_PROTECTED (type, nfields);
14138 case DW_ACCESS_public:
14142 /* Unknown accessibility. Complain and treat it as public. */
14144 complaint (&symfile_complaints, _("unsupported accessibility %d"),
14145 fieldp->accessibility);
14149 if (nfields < fip->nbaseclasses)
14151 switch (fieldp->virtuality)
14153 case DW_VIRTUALITY_virtual:
14154 case DW_VIRTUALITY_pure_virtual:
14155 if (cu->language == language_ada)
14156 error (_("unexpected virtuality in component of Ada type"));
14157 SET_TYPE_FIELD_VIRTUAL (type, nfields);
14164 /* Return true if this member function is a constructor, false
14168 dwarf2_is_constructor (struct die_info *die, struct dwarf2_cu *cu)
14170 const char *fieldname;
14171 const char *type_name;
14174 if (die->parent == NULL)
14177 if (die->parent->tag != DW_TAG_structure_type
14178 && die->parent->tag != DW_TAG_union_type
14179 && die->parent->tag != DW_TAG_class_type)
14182 fieldname = dwarf2_name (die, cu);
14183 type_name = dwarf2_name (die->parent, cu);
14184 if (fieldname == NULL || type_name == NULL)
14187 len = strlen (fieldname);
14188 return (strncmp (fieldname, type_name, len) == 0
14189 && (type_name[len] == '\0' || type_name[len] == '<'));
14192 /* Add a member function to the proper fieldlist. */
14195 dwarf2_add_member_fn (struct field_info *fip, struct die_info *die,
14196 struct type *type, struct dwarf2_cu *cu)
14198 struct objfile *objfile = cu->objfile;
14199 struct attribute *attr;
14200 struct fnfieldlist *flp;
14202 struct fn_field *fnp;
14203 const char *fieldname;
14204 struct nextfnfield *new_fnfield;
14205 struct type *this_type;
14206 enum dwarf_access_attribute accessibility;
14208 if (cu->language == language_ada)
14209 error (_("unexpected member function in Ada type"));
14211 /* Get name of member function. */
14212 fieldname = dwarf2_name (die, cu);
14213 if (fieldname == NULL)
14216 /* Look up member function name in fieldlist. */
14217 for (i = 0; i < fip->nfnfields; i++)
14219 if (strcmp (fip->fnfieldlists[i].name, fieldname) == 0)
14223 /* Create new list element if necessary. */
14224 if (i < fip->nfnfields)
14225 flp = &fip->fnfieldlists[i];
14228 if ((fip->nfnfields % DW_FIELD_ALLOC_CHUNK) == 0)
14230 fip->fnfieldlists = (struct fnfieldlist *)
14231 xrealloc (fip->fnfieldlists,
14232 (fip->nfnfields + DW_FIELD_ALLOC_CHUNK)
14233 * sizeof (struct fnfieldlist));
14234 if (fip->nfnfields == 0)
14235 make_cleanup (free_current_contents, &fip->fnfieldlists);
14237 flp = &fip->fnfieldlists[fip->nfnfields];
14238 flp->name = fieldname;
14241 i = fip->nfnfields++;
14244 /* Create a new member function field and chain it to the field list
14246 new_fnfield = XNEW (struct nextfnfield);
14247 make_cleanup (xfree, new_fnfield);
14248 memset (new_fnfield, 0, sizeof (struct nextfnfield));
14249 new_fnfield->next = flp->head;
14250 flp->head = new_fnfield;
14253 /* Fill in the member function field info. */
14254 fnp = &new_fnfield->fnfield;
14256 /* Delay processing of the physname until later. */
14257 if (cu->language == language_cplus)
14259 add_to_method_list (type, i, flp->length - 1, fieldname,
14264 const char *physname = dwarf2_physname (fieldname, die, cu);
14265 fnp->physname = physname ? physname : "";
14268 fnp->type = alloc_type (objfile);
14269 this_type = read_type_die (die, cu);
14270 if (this_type && TYPE_CODE (this_type) == TYPE_CODE_FUNC)
14272 int nparams = TYPE_NFIELDS (this_type);
14274 /* TYPE is the domain of this method, and THIS_TYPE is the type
14275 of the method itself (TYPE_CODE_METHOD). */
14276 smash_to_method_type (fnp->type, type,
14277 TYPE_TARGET_TYPE (this_type),
14278 TYPE_FIELDS (this_type),
14279 TYPE_NFIELDS (this_type),
14280 TYPE_VARARGS (this_type));
14282 /* Handle static member functions.
14283 Dwarf2 has no clean way to discern C++ static and non-static
14284 member functions. G++ helps GDB by marking the first
14285 parameter for non-static member functions (which is the this
14286 pointer) as artificial. We obtain this information from
14287 read_subroutine_type via TYPE_FIELD_ARTIFICIAL. */
14288 if (nparams == 0 || TYPE_FIELD_ARTIFICIAL (this_type, 0) == 0)
14289 fnp->voffset = VOFFSET_STATIC;
14292 complaint (&symfile_complaints, _("member function type missing for '%s'"),
14293 dwarf2_full_name (fieldname, die, cu));
14295 /* Get fcontext from DW_AT_containing_type if present. */
14296 if (dwarf2_attr (die, DW_AT_containing_type, cu) != NULL)
14297 fnp->fcontext = die_containing_type (die, cu);
14299 /* dwarf2 doesn't have stubbed physical names, so the setting of is_const and
14300 is_volatile is irrelevant, as it is needed by gdb_mangle_name only. */
14302 /* Get accessibility. */
14303 attr = dwarf2_attr (die, DW_AT_accessibility, cu);
14305 accessibility = (enum dwarf_access_attribute) DW_UNSND (attr);
14307 accessibility = dwarf2_default_access_attribute (die, cu);
14308 switch (accessibility)
14310 case DW_ACCESS_private:
14311 fnp->is_private = 1;
14313 case DW_ACCESS_protected:
14314 fnp->is_protected = 1;
14318 /* Check for artificial methods. */
14319 attr = dwarf2_attr (die, DW_AT_artificial, cu);
14320 if (attr && DW_UNSND (attr) != 0)
14321 fnp->is_artificial = 1;
14323 fnp->is_constructor = dwarf2_is_constructor (die, cu);
14325 /* Get index in virtual function table if it is a virtual member
14326 function. For older versions of GCC, this is an offset in the
14327 appropriate virtual table, as specified by DW_AT_containing_type.
14328 For everyone else, it is an expression to be evaluated relative
14329 to the object address. */
14331 attr = dwarf2_attr (die, DW_AT_vtable_elem_location, cu);
14334 if (attr_form_is_block (attr) && DW_BLOCK (attr)->size > 0)
14336 if (DW_BLOCK (attr)->data[0] == DW_OP_constu)
14338 /* Old-style GCC. */
14339 fnp->voffset = decode_locdesc (DW_BLOCK (attr), cu) + 2;
14341 else if (DW_BLOCK (attr)->data[0] == DW_OP_deref
14342 || (DW_BLOCK (attr)->size > 1
14343 && DW_BLOCK (attr)->data[0] == DW_OP_deref_size
14344 && DW_BLOCK (attr)->data[1] == cu->header.addr_size))
14346 fnp->voffset = decode_locdesc (DW_BLOCK (attr), cu);
14347 if ((fnp->voffset % cu->header.addr_size) != 0)
14348 dwarf2_complex_location_expr_complaint ();
14350 fnp->voffset /= cu->header.addr_size;
14354 dwarf2_complex_location_expr_complaint ();
14356 if (!fnp->fcontext)
14358 /* If there is no `this' field and no DW_AT_containing_type,
14359 we cannot actually find a base class context for the
14361 if (TYPE_NFIELDS (this_type) == 0
14362 || !TYPE_FIELD_ARTIFICIAL (this_type, 0))
14364 complaint (&symfile_complaints,
14365 _("cannot determine context for virtual member "
14366 "function \"%s\" (offset %d)"),
14367 fieldname, to_underlying (die->sect_off));
14372 = TYPE_TARGET_TYPE (TYPE_FIELD_TYPE (this_type, 0));
14376 else if (attr_form_is_section_offset (attr))
14378 dwarf2_complex_location_expr_complaint ();
14382 dwarf2_invalid_attrib_class_complaint ("DW_AT_vtable_elem_location",
14388 attr = dwarf2_attr (die, DW_AT_virtuality, cu);
14389 if (attr && DW_UNSND (attr))
14391 /* GCC does this, as of 2008-08-25; PR debug/37237. */
14392 complaint (&symfile_complaints,
14393 _("Member function \"%s\" (offset %d) is virtual "
14394 "but the vtable offset is not specified"),
14395 fieldname, to_underlying (die->sect_off));
14396 ALLOCATE_CPLUS_STRUCT_TYPE (type);
14397 TYPE_CPLUS_DYNAMIC (type) = 1;
14402 /* Create the vector of member function fields, and attach it to the type. */
14405 dwarf2_attach_fn_fields_to_type (struct field_info *fip, struct type *type,
14406 struct dwarf2_cu *cu)
14408 struct fnfieldlist *flp;
14411 if (cu->language == language_ada)
14412 error (_("unexpected member functions in Ada type"));
14414 ALLOCATE_CPLUS_STRUCT_TYPE (type);
14415 TYPE_FN_FIELDLISTS (type) = (struct fn_fieldlist *)
14416 TYPE_ALLOC (type, sizeof (struct fn_fieldlist) * fip->nfnfields);
14418 for (i = 0, flp = fip->fnfieldlists; i < fip->nfnfields; i++, flp++)
14420 struct nextfnfield *nfp = flp->head;
14421 struct fn_fieldlist *fn_flp = &TYPE_FN_FIELDLIST (type, i);
14424 TYPE_FN_FIELDLIST_NAME (type, i) = flp->name;
14425 TYPE_FN_FIELDLIST_LENGTH (type, i) = flp->length;
14426 fn_flp->fn_fields = (struct fn_field *)
14427 TYPE_ALLOC (type, sizeof (struct fn_field) * flp->length);
14428 for (k = flp->length; (k--, nfp); nfp = nfp->next)
14429 fn_flp->fn_fields[k] = nfp->fnfield;
14432 TYPE_NFN_FIELDS (type) = fip->nfnfields;
14435 /* Returns non-zero if NAME is the name of a vtable member in CU's
14436 language, zero otherwise. */
14438 is_vtable_name (const char *name, struct dwarf2_cu *cu)
14440 static const char vptr[] = "_vptr";
14441 static const char vtable[] = "vtable";
14443 /* Look for the C++ form of the vtable. */
14444 if (startswith (name, vptr) && is_cplus_marker (name[sizeof (vptr) - 1]))
14450 /* GCC outputs unnamed structures that are really pointers to member
14451 functions, with the ABI-specified layout. If TYPE describes
14452 such a structure, smash it into a member function type.
14454 GCC shouldn't do this; it should just output pointer to member DIEs.
14455 This is GCC PR debug/28767. */
14458 quirk_gcc_member_function_pointer (struct type *type, struct objfile *objfile)
14460 struct type *pfn_type, *self_type, *new_type;
14462 /* Check for a structure with no name and two children. */
14463 if (TYPE_CODE (type) != TYPE_CODE_STRUCT || TYPE_NFIELDS (type) != 2)
14466 /* Check for __pfn and __delta members. */
14467 if (TYPE_FIELD_NAME (type, 0) == NULL
14468 || strcmp (TYPE_FIELD_NAME (type, 0), "__pfn") != 0
14469 || TYPE_FIELD_NAME (type, 1) == NULL
14470 || strcmp (TYPE_FIELD_NAME (type, 1), "__delta") != 0)
14473 /* Find the type of the method. */
14474 pfn_type = TYPE_FIELD_TYPE (type, 0);
14475 if (pfn_type == NULL
14476 || TYPE_CODE (pfn_type) != TYPE_CODE_PTR
14477 || TYPE_CODE (TYPE_TARGET_TYPE (pfn_type)) != TYPE_CODE_FUNC)
14480 /* Look for the "this" argument. */
14481 pfn_type = TYPE_TARGET_TYPE (pfn_type);
14482 if (TYPE_NFIELDS (pfn_type) == 0
14483 /* || TYPE_FIELD_TYPE (pfn_type, 0) == NULL */
14484 || TYPE_CODE (TYPE_FIELD_TYPE (pfn_type, 0)) != TYPE_CODE_PTR)
14487 self_type = TYPE_TARGET_TYPE (TYPE_FIELD_TYPE (pfn_type, 0));
14488 new_type = alloc_type (objfile);
14489 smash_to_method_type (new_type, self_type, TYPE_TARGET_TYPE (pfn_type),
14490 TYPE_FIELDS (pfn_type), TYPE_NFIELDS (pfn_type),
14491 TYPE_VARARGS (pfn_type));
14492 smash_to_methodptr_type (type, new_type);
14496 /* Called when we find the DIE that starts a structure or union scope
14497 (definition) to create a type for the structure or union. Fill in
14498 the type's name and general properties; the members will not be
14499 processed until process_structure_scope. A symbol table entry for
14500 the type will also not be done until process_structure_scope (assuming
14501 the type has a name).
14503 NOTE: we need to call these functions regardless of whether or not the
14504 DIE has a DW_AT_name attribute, since it might be an anonymous
14505 structure or union. This gets the type entered into our set of
14506 user defined types. */
14508 static struct type *
14509 read_structure_type (struct die_info *die, struct dwarf2_cu *cu)
14511 struct objfile *objfile = cu->objfile;
14513 struct attribute *attr;
14516 /* If the definition of this type lives in .debug_types, read that type.
14517 Don't follow DW_AT_specification though, that will take us back up
14518 the chain and we want to go down. */
14519 attr = dwarf2_attr_no_follow (die, DW_AT_signature);
14522 type = get_DW_AT_signature_type (die, attr, cu);
14524 /* The type's CU may not be the same as CU.
14525 Ensure TYPE is recorded with CU in die_type_hash. */
14526 return set_die_type (die, type, cu);
14529 type = alloc_type (objfile);
14530 INIT_CPLUS_SPECIFIC (type);
14532 name = dwarf2_name (die, cu);
14535 if (cu->language == language_cplus
14536 || cu->language == language_d
14537 || cu->language == language_rust)
14539 const char *full_name = dwarf2_full_name (name, die, cu);
14541 /* dwarf2_full_name might have already finished building the DIE's
14542 type. If so, there is no need to continue. */
14543 if (get_die_type (die, cu) != NULL)
14544 return get_die_type (die, cu);
14546 TYPE_TAG_NAME (type) = full_name;
14547 if (die->tag == DW_TAG_structure_type
14548 || die->tag == DW_TAG_class_type)
14549 TYPE_NAME (type) = TYPE_TAG_NAME (type);
14553 /* The name is already allocated along with this objfile, so
14554 we don't need to duplicate it for the type. */
14555 TYPE_TAG_NAME (type) = name;
14556 if (die->tag == DW_TAG_class_type)
14557 TYPE_NAME (type) = TYPE_TAG_NAME (type);
14561 if (die->tag == DW_TAG_structure_type)
14563 TYPE_CODE (type) = TYPE_CODE_STRUCT;
14565 else if (die->tag == DW_TAG_union_type)
14567 TYPE_CODE (type) = TYPE_CODE_UNION;
14571 TYPE_CODE (type) = TYPE_CODE_STRUCT;
14574 if (cu->language == language_cplus && die->tag == DW_TAG_class_type)
14575 TYPE_DECLARED_CLASS (type) = 1;
14577 attr = dwarf2_attr (die, DW_AT_byte_size, cu);
14580 if (attr_form_is_constant (attr))
14581 TYPE_LENGTH (type) = DW_UNSND (attr);
14584 /* For the moment, dynamic type sizes are not supported
14585 by GDB's struct type. The actual size is determined
14586 on-demand when resolving the type of a given object,
14587 so set the type's length to zero for now. Otherwise,
14588 we record an expression as the length, and that expression
14589 could lead to a very large value, which could eventually
14590 lead to us trying to allocate that much memory when creating
14591 a value of that type. */
14592 TYPE_LENGTH (type) = 0;
14597 TYPE_LENGTH (type) = 0;
14600 if (producer_is_icc_lt_14 (cu) && (TYPE_LENGTH (type) == 0))
14602 /* ICC<14 does not output the required DW_AT_declaration on
14603 incomplete types, but gives them a size of zero. */
14604 TYPE_STUB (type) = 1;
14607 TYPE_STUB_SUPPORTED (type) = 1;
14609 if (die_is_declaration (die, cu))
14610 TYPE_STUB (type) = 1;
14611 else if (attr == NULL && die->child == NULL
14612 && producer_is_realview (cu->producer))
14613 /* RealView does not output the required DW_AT_declaration
14614 on incomplete types. */
14615 TYPE_STUB (type) = 1;
14617 /* We need to add the type field to the die immediately so we don't
14618 infinitely recurse when dealing with pointers to the structure
14619 type within the structure itself. */
14620 set_die_type (die, type, cu);
14622 /* set_die_type should be already done. */
14623 set_descriptive_type (type, die, cu);
14628 /* Finish creating a structure or union type, including filling in
14629 its members and creating a symbol for it. */
14632 process_structure_scope (struct die_info *die, struct dwarf2_cu *cu)
14634 struct objfile *objfile = cu->objfile;
14635 struct die_info *child_die;
14638 type = get_die_type (die, cu);
14640 type = read_structure_type (die, cu);
14642 if (die->child != NULL && ! die_is_declaration (die, cu))
14644 struct field_info fi;
14645 std::vector<struct symbol *> template_args;
14646 struct cleanup *back_to = make_cleanup (null_cleanup, 0);
14648 memset (&fi, 0, sizeof (struct field_info));
14650 child_die = die->child;
14652 while (child_die && child_die->tag)
14654 if (child_die->tag == DW_TAG_member
14655 || child_die->tag == DW_TAG_variable)
14657 /* NOTE: carlton/2002-11-05: A C++ static data member
14658 should be a DW_TAG_member that is a declaration, but
14659 all versions of G++ as of this writing (so through at
14660 least 3.2.1) incorrectly generate DW_TAG_variable
14661 tags for them instead. */
14662 dwarf2_add_field (&fi, child_die, cu);
14664 else if (child_die->tag == DW_TAG_subprogram)
14666 /* Rust doesn't have member functions in the C++ sense.
14667 However, it does emit ordinary functions as children
14668 of a struct DIE. */
14669 if (cu->language == language_rust)
14670 read_func_scope (child_die, cu);
14673 /* C++ member function. */
14674 dwarf2_add_member_fn (&fi, child_die, type, cu);
14677 else if (child_die->tag == DW_TAG_inheritance)
14679 /* C++ base class field. */
14680 dwarf2_add_field (&fi, child_die, cu);
14682 else if (child_die->tag == DW_TAG_typedef)
14683 dwarf2_add_typedef (&fi, child_die, cu);
14684 else if (child_die->tag == DW_TAG_template_type_param
14685 || child_die->tag == DW_TAG_template_value_param)
14687 struct symbol *arg = new_symbol (child_die, NULL, cu);
14690 template_args.push_back (arg);
14693 child_die = sibling_die (child_die);
14696 /* Attach template arguments to type. */
14697 if (!template_args.empty ())
14699 ALLOCATE_CPLUS_STRUCT_TYPE (type);
14700 TYPE_N_TEMPLATE_ARGUMENTS (type) = template_args.size ();
14701 TYPE_TEMPLATE_ARGUMENTS (type)
14702 = XOBNEWVEC (&objfile->objfile_obstack,
14704 TYPE_N_TEMPLATE_ARGUMENTS (type));
14705 memcpy (TYPE_TEMPLATE_ARGUMENTS (type),
14706 template_args.data (),
14707 (TYPE_N_TEMPLATE_ARGUMENTS (type)
14708 * sizeof (struct symbol *)));
14711 /* Attach fields and member functions to the type. */
14713 dwarf2_attach_fields_to_type (&fi, type, cu);
14716 dwarf2_attach_fn_fields_to_type (&fi, type, cu);
14718 /* Get the type which refers to the base class (possibly this
14719 class itself) which contains the vtable pointer for the current
14720 class from the DW_AT_containing_type attribute. This use of
14721 DW_AT_containing_type is a GNU extension. */
14723 if (dwarf2_attr (die, DW_AT_containing_type, cu) != NULL)
14725 struct type *t = die_containing_type (die, cu);
14727 set_type_vptr_basetype (type, t);
14732 /* Our own class provides vtbl ptr. */
14733 for (i = TYPE_NFIELDS (t) - 1;
14734 i >= TYPE_N_BASECLASSES (t);
14737 const char *fieldname = TYPE_FIELD_NAME (t, i);
14739 if (is_vtable_name (fieldname, cu))
14741 set_type_vptr_fieldno (type, i);
14746 /* Complain if virtual function table field not found. */
14747 if (i < TYPE_N_BASECLASSES (t))
14748 complaint (&symfile_complaints,
14749 _("virtual function table pointer "
14750 "not found when defining class '%s'"),
14751 TYPE_TAG_NAME (type) ? TYPE_TAG_NAME (type) :
14756 set_type_vptr_fieldno (type, TYPE_VPTR_FIELDNO (t));
14759 else if (cu->producer
14760 && startswith (cu->producer, "IBM(R) XL C/C++ Advanced Edition"))
14762 /* The IBM XLC compiler does not provide direct indication
14763 of the containing type, but the vtable pointer is
14764 always named __vfp. */
14768 for (i = TYPE_NFIELDS (type) - 1;
14769 i >= TYPE_N_BASECLASSES (type);
14772 if (strcmp (TYPE_FIELD_NAME (type, i), "__vfp") == 0)
14774 set_type_vptr_fieldno (type, i);
14775 set_type_vptr_basetype (type, type);
14782 /* Copy fi.typedef_field_list linked list elements content into the
14783 allocated array TYPE_TYPEDEF_FIELD_ARRAY (type). */
14784 if (fi.typedef_field_list)
14786 int i = fi.typedef_field_list_count;
14788 ALLOCATE_CPLUS_STRUCT_TYPE (type);
14789 TYPE_TYPEDEF_FIELD_ARRAY (type)
14790 = ((struct typedef_field *)
14791 TYPE_ALLOC (type, sizeof (TYPE_TYPEDEF_FIELD (type, 0)) * i));
14792 TYPE_TYPEDEF_FIELD_COUNT (type) = i;
14794 /* Reverse the list order to keep the debug info elements order. */
14797 struct typedef_field *dest, *src;
14799 dest = &TYPE_TYPEDEF_FIELD (type, i);
14800 src = &fi.typedef_field_list->field;
14801 fi.typedef_field_list = fi.typedef_field_list->next;
14806 do_cleanups (back_to);
14809 quirk_gcc_member_function_pointer (type, objfile);
14811 /* NOTE: carlton/2004-03-16: GCC 3.4 (or at least one of its
14812 snapshots) has been known to create a die giving a declaration
14813 for a class that has, as a child, a die giving a definition for a
14814 nested class. So we have to process our children even if the
14815 current die is a declaration. Normally, of course, a declaration
14816 won't have any children at all. */
14818 child_die = die->child;
14820 while (child_die != NULL && child_die->tag)
14822 if (child_die->tag == DW_TAG_member
14823 || child_die->tag == DW_TAG_variable
14824 || child_die->tag == DW_TAG_inheritance
14825 || child_die->tag == DW_TAG_template_value_param
14826 || child_die->tag == DW_TAG_template_type_param)
14831 process_die (child_die, cu);
14833 child_die = sibling_die (child_die);
14836 /* Do not consider external references. According to the DWARF standard,
14837 these DIEs are identified by the fact that they have no byte_size
14838 attribute, and a declaration attribute. */
14839 if (dwarf2_attr (die, DW_AT_byte_size, cu) != NULL
14840 || !die_is_declaration (die, cu))
14841 new_symbol (die, type, cu);
14844 /* Assuming DIE is an enumeration type, and TYPE is its associated type,
14845 update TYPE using some information only available in DIE's children. */
14848 update_enumeration_type_from_children (struct die_info *die,
14850 struct dwarf2_cu *cu)
14852 struct die_info *child_die;
14853 int unsigned_enum = 1;
14857 auto_obstack obstack;
14859 for (child_die = die->child;
14860 child_die != NULL && child_die->tag;
14861 child_die = sibling_die (child_die))
14863 struct attribute *attr;
14865 const gdb_byte *bytes;
14866 struct dwarf2_locexpr_baton *baton;
14869 if (child_die->tag != DW_TAG_enumerator)
14872 attr = dwarf2_attr (child_die, DW_AT_const_value, cu);
14876 name = dwarf2_name (child_die, cu);
14878 name = "<anonymous enumerator>";
14880 dwarf2_const_value_attr (attr, type, name, &obstack, cu,
14881 &value, &bytes, &baton);
14887 else if ((mask & value) != 0)
14892 /* If we already know that the enum type is neither unsigned, nor
14893 a flag type, no need to look at the rest of the enumerates. */
14894 if (!unsigned_enum && !flag_enum)
14899 TYPE_UNSIGNED (type) = 1;
14901 TYPE_FLAG_ENUM (type) = 1;
14904 /* Given a DW_AT_enumeration_type die, set its type. We do not
14905 complete the type's fields yet, or create any symbols. */
14907 static struct type *
14908 read_enumeration_type (struct die_info *die, struct dwarf2_cu *cu)
14910 struct objfile *objfile = cu->objfile;
14912 struct attribute *attr;
14915 /* If the definition of this type lives in .debug_types, read that type.
14916 Don't follow DW_AT_specification though, that will take us back up
14917 the chain and we want to go down. */
14918 attr = dwarf2_attr_no_follow (die, DW_AT_signature);
14921 type = get_DW_AT_signature_type (die, attr, cu);
14923 /* The type's CU may not be the same as CU.
14924 Ensure TYPE is recorded with CU in die_type_hash. */
14925 return set_die_type (die, type, cu);
14928 type = alloc_type (objfile);
14930 TYPE_CODE (type) = TYPE_CODE_ENUM;
14931 name = dwarf2_full_name (NULL, die, cu);
14933 TYPE_TAG_NAME (type) = name;
14935 attr = dwarf2_attr (die, DW_AT_type, cu);
14938 struct type *underlying_type = die_type (die, cu);
14940 TYPE_TARGET_TYPE (type) = underlying_type;
14943 attr = dwarf2_attr (die, DW_AT_byte_size, cu);
14946 TYPE_LENGTH (type) = DW_UNSND (attr);
14950 TYPE_LENGTH (type) = 0;
14953 /* The enumeration DIE can be incomplete. In Ada, any type can be
14954 declared as private in the package spec, and then defined only
14955 inside the package body. Such types are known as Taft Amendment
14956 Types. When another package uses such a type, an incomplete DIE
14957 may be generated by the compiler. */
14958 if (die_is_declaration (die, cu))
14959 TYPE_STUB (type) = 1;
14961 /* Finish the creation of this type by using the enum's children.
14962 We must call this even when the underlying type has been provided
14963 so that we can determine if we're looking at a "flag" enum. */
14964 update_enumeration_type_from_children (die, type, cu);
14966 /* If this type has an underlying type that is not a stub, then we
14967 may use its attributes. We always use the "unsigned" attribute
14968 in this situation, because ordinarily we guess whether the type
14969 is unsigned -- but the guess can be wrong and the underlying type
14970 can tell us the reality. However, we defer to a local size
14971 attribute if one exists, because this lets the compiler override
14972 the underlying type if needed. */
14973 if (TYPE_TARGET_TYPE (type) != NULL && !TYPE_STUB (TYPE_TARGET_TYPE (type)))
14975 TYPE_UNSIGNED (type) = TYPE_UNSIGNED (TYPE_TARGET_TYPE (type));
14976 if (TYPE_LENGTH (type) == 0)
14977 TYPE_LENGTH (type) = TYPE_LENGTH (TYPE_TARGET_TYPE (type));
14980 TYPE_DECLARED_CLASS (type) = dwarf2_flag_true_p (die, DW_AT_enum_class, cu);
14982 return set_die_type (die, type, cu);
14985 /* Given a pointer to a die which begins an enumeration, process all
14986 the dies that define the members of the enumeration, and create the
14987 symbol for the enumeration type.
14989 NOTE: We reverse the order of the element list. */
14992 process_enumeration_scope (struct die_info *die, struct dwarf2_cu *cu)
14994 struct type *this_type;
14996 this_type = get_die_type (die, cu);
14997 if (this_type == NULL)
14998 this_type = read_enumeration_type (die, cu);
15000 if (die->child != NULL)
15002 struct die_info *child_die;
15003 struct symbol *sym;
15004 struct field *fields = NULL;
15005 int num_fields = 0;
15008 child_die = die->child;
15009 while (child_die && child_die->tag)
15011 if (child_die->tag != DW_TAG_enumerator)
15013 process_die (child_die, cu);
15017 name = dwarf2_name (child_die, cu);
15020 sym = new_symbol (child_die, this_type, cu);
15022 if ((num_fields % DW_FIELD_ALLOC_CHUNK) == 0)
15024 fields = (struct field *)
15026 (num_fields + DW_FIELD_ALLOC_CHUNK)
15027 * sizeof (struct field));
15030 FIELD_NAME (fields[num_fields]) = SYMBOL_LINKAGE_NAME (sym);
15031 FIELD_TYPE (fields[num_fields]) = NULL;
15032 SET_FIELD_ENUMVAL (fields[num_fields], SYMBOL_VALUE (sym));
15033 FIELD_BITSIZE (fields[num_fields]) = 0;
15039 child_die = sibling_die (child_die);
15044 TYPE_NFIELDS (this_type) = num_fields;
15045 TYPE_FIELDS (this_type) = (struct field *)
15046 TYPE_ALLOC (this_type, sizeof (struct field) * num_fields);
15047 memcpy (TYPE_FIELDS (this_type), fields,
15048 sizeof (struct field) * num_fields);
15053 /* If we are reading an enum from a .debug_types unit, and the enum
15054 is a declaration, and the enum is not the signatured type in the
15055 unit, then we do not want to add a symbol for it. Adding a
15056 symbol would in some cases obscure the true definition of the
15057 enum, giving users an incomplete type when the definition is
15058 actually available. Note that we do not want to do this for all
15059 enums which are just declarations, because C++0x allows forward
15060 enum declarations. */
15061 if (cu->per_cu->is_debug_types
15062 && die_is_declaration (die, cu))
15064 struct signatured_type *sig_type;
15066 sig_type = (struct signatured_type *) cu->per_cu;
15067 gdb_assert (to_underlying (sig_type->type_offset_in_section) != 0);
15068 if (sig_type->type_offset_in_section != die->sect_off)
15072 new_symbol (die, this_type, cu);
15075 /* Extract all information from a DW_TAG_array_type DIE and put it in
15076 the DIE's type field. For now, this only handles one dimensional
15079 static struct type *
15080 read_array_type (struct die_info *die, struct dwarf2_cu *cu)
15082 struct objfile *objfile = cu->objfile;
15083 struct die_info *child_die;
15085 struct type *element_type, *range_type, *index_type;
15086 struct attribute *attr;
15088 unsigned int bit_stride = 0;
15090 element_type = die_type (die, cu);
15092 /* The die_type call above may have already set the type for this DIE. */
15093 type = get_die_type (die, cu);
15097 attr = dwarf2_attr (die, DW_AT_byte_stride, cu);
15099 bit_stride = DW_UNSND (attr) * 8;
15101 attr = dwarf2_attr (die, DW_AT_bit_stride, cu);
15103 bit_stride = DW_UNSND (attr);
15105 /* Irix 6.2 native cc creates array types without children for
15106 arrays with unspecified length. */
15107 if (die->child == NULL)
15109 index_type = objfile_type (objfile)->builtin_int;
15110 range_type = create_static_range_type (NULL, index_type, 0, -1);
15111 type = create_array_type_with_stride (NULL, element_type, range_type,
15113 return set_die_type (die, type, cu);
15116 std::vector<struct type *> range_types;
15117 child_die = die->child;
15118 while (child_die && child_die->tag)
15120 if (child_die->tag == DW_TAG_subrange_type)
15122 struct type *child_type = read_type_die (child_die, cu);
15124 if (child_type != NULL)
15126 /* The range type was succesfully read. Save it for the
15127 array type creation. */
15128 range_types.push_back (child_type);
15131 child_die = sibling_die (child_die);
15134 /* Dwarf2 dimensions are output from left to right, create the
15135 necessary array types in backwards order. */
15137 type = element_type;
15139 if (read_array_order (die, cu) == DW_ORD_col_major)
15143 while (i < range_types.size ())
15144 type = create_array_type_with_stride (NULL, type, range_types[i++],
15149 size_t ndim = range_types.size ();
15151 type = create_array_type_with_stride (NULL, type, range_types[ndim],
15155 /* Understand Dwarf2 support for vector types (like they occur on
15156 the PowerPC w/ AltiVec). Gcc just adds another attribute to the
15157 array type. This is not part of the Dwarf2/3 standard yet, but a
15158 custom vendor extension. The main difference between a regular
15159 array and the vector variant is that vectors are passed by value
15161 attr = dwarf2_attr (die, DW_AT_GNU_vector, cu);
15163 make_vector_type (type);
15165 /* The DIE may have DW_AT_byte_size set. For example an OpenCL
15166 implementation may choose to implement triple vectors using this
15168 attr = dwarf2_attr (die, DW_AT_byte_size, cu);
15171 if (DW_UNSND (attr) >= TYPE_LENGTH (type))
15172 TYPE_LENGTH (type) = DW_UNSND (attr);
15174 complaint (&symfile_complaints,
15175 _("DW_AT_byte_size for array type smaller "
15176 "than the total size of elements"));
15179 name = dwarf2_name (die, cu);
15181 TYPE_NAME (type) = name;
15183 /* Install the type in the die. */
15184 set_die_type (die, type, cu);
15186 /* set_die_type should be already done. */
15187 set_descriptive_type (type, die, cu);
15192 static enum dwarf_array_dim_ordering
15193 read_array_order (struct die_info *die, struct dwarf2_cu *cu)
15195 struct attribute *attr;
15197 attr = dwarf2_attr (die, DW_AT_ordering, cu);
15200 return (enum dwarf_array_dim_ordering) DW_SND (attr);
15202 /* GNU F77 is a special case, as at 08/2004 array type info is the
15203 opposite order to the dwarf2 specification, but data is still
15204 laid out as per normal fortran.
15206 FIXME: dsl/2004-8-20: If G77 is ever fixed, this will also need
15207 version checking. */
15209 if (cu->language == language_fortran
15210 && cu->producer && strstr (cu->producer, "GNU F77"))
15212 return DW_ORD_row_major;
15215 switch (cu->language_defn->la_array_ordering)
15217 case array_column_major:
15218 return DW_ORD_col_major;
15219 case array_row_major:
15221 return DW_ORD_row_major;
15225 /* Extract all information from a DW_TAG_set_type DIE and put it in
15226 the DIE's type field. */
15228 static struct type *
15229 read_set_type (struct die_info *die, struct dwarf2_cu *cu)
15231 struct type *domain_type, *set_type;
15232 struct attribute *attr;
15234 domain_type = die_type (die, cu);
15236 /* The die_type call above may have already set the type for this DIE. */
15237 set_type = get_die_type (die, cu);
15241 set_type = create_set_type (NULL, domain_type);
15243 attr = dwarf2_attr (die, DW_AT_byte_size, cu);
15245 TYPE_LENGTH (set_type) = DW_UNSND (attr);
15247 return set_die_type (die, set_type, cu);
15250 /* A helper for read_common_block that creates a locexpr baton.
15251 SYM is the symbol which we are marking as computed.
15252 COMMON_DIE is the DIE for the common block.
15253 COMMON_LOC is the location expression attribute for the common
15255 MEMBER_LOC is the location expression attribute for the particular
15256 member of the common block that we are processing.
15257 CU is the CU from which the above come. */
15260 mark_common_block_symbol_computed (struct symbol *sym,
15261 struct die_info *common_die,
15262 struct attribute *common_loc,
15263 struct attribute *member_loc,
15264 struct dwarf2_cu *cu)
15266 struct objfile *objfile = dwarf2_per_objfile->objfile;
15267 struct dwarf2_locexpr_baton *baton;
15269 unsigned int cu_off;
15270 enum bfd_endian byte_order = gdbarch_byte_order (get_objfile_arch (objfile));
15271 LONGEST offset = 0;
15273 gdb_assert (common_loc && member_loc);
15274 gdb_assert (attr_form_is_block (common_loc));
15275 gdb_assert (attr_form_is_block (member_loc)
15276 || attr_form_is_constant (member_loc));
15278 baton = XOBNEW (&objfile->objfile_obstack, struct dwarf2_locexpr_baton);
15279 baton->per_cu = cu->per_cu;
15280 gdb_assert (baton->per_cu);
15282 baton->size = 5 /* DW_OP_call4 */ + 1 /* DW_OP_plus */;
15284 if (attr_form_is_constant (member_loc))
15286 offset = dwarf2_get_attr_constant_value (member_loc, 0);
15287 baton->size += 1 /* DW_OP_addr */ + cu->header.addr_size;
15290 baton->size += DW_BLOCK (member_loc)->size;
15292 ptr = (gdb_byte *) obstack_alloc (&objfile->objfile_obstack, baton->size);
15295 *ptr++ = DW_OP_call4;
15296 cu_off = common_die->sect_off - cu->per_cu->sect_off;
15297 store_unsigned_integer (ptr, 4, byte_order, cu_off);
15300 if (attr_form_is_constant (member_loc))
15302 *ptr++ = DW_OP_addr;
15303 store_unsigned_integer (ptr, cu->header.addr_size, byte_order, offset);
15304 ptr += cu->header.addr_size;
15308 /* We have to copy the data here, because DW_OP_call4 will only
15309 use a DW_AT_location attribute. */
15310 memcpy (ptr, DW_BLOCK (member_loc)->data, DW_BLOCK (member_loc)->size);
15311 ptr += DW_BLOCK (member_loc)->size;
15314 *ptr++ = DW_OP_plus;
15315 gdb_assert (ptr - baton->data == baton->size);
15317 SYMBOL_LOCATION_BATON (sym) = baton;
15318 SYMBOL_ACLASS_INDEX (sym) = dwarf2_locexpr_index;
15321 /* Create appropriate locally-scoped variables for all the
15322 DW_TAG_common_block entries. Also create a struct common_block
15323 listing all such variables for `info common'. COMMON_BLOCK_DOMAIN
15324 is used to sepate the common blocks name namespace from regular
15328 read_common_block (struct die_info *die, struct dwarf2_cu *cu)
15330 struct attribute *attr;
15332 attr = dwarf2_attr (die, DW_AT_location, cu);
15335 /* Support the .debug_loc offsets. */
15336 if (attr_form_is_block (attr))
15340 else if (attr_form_is_section_offset (attr))
15342 dwarf2_complex_location_expr_complaint ();
15347 dwarf2_invalid_attrib_class_complaint ("DW_AT_location",
15348 "common block member");
15353 if (die->child != NULL)
15355 struct objfile *objfile = cu->objfile;
15356 struct die_info *child_die;
15357 size_t n_entries = 0, size;
15358 struct common_block *common_block;
15359 struct symbol *sym;
15361 for (child_die = die->child;
15362 child_die && child_die->tag;
15363 child_die = sibling_die (child_die))
15366 size = (sizeof (struct common_block)
15367 + (n_entries - 1) * sizeof (struct symbol *));
15369 = (struct common_block *) obstack_alloc (&objfile->objfile_obstack,
15371 memset (common_block->contents, 0, n_entries * sizeof (struct symbol *));
15372 common_block->n_entries = 0;
15374 for (child_die = die->child;
15375 child_die && child_die->tag;
15376 child_die = sibling_die (child_die))
15378 /* Create the symbol in the DW_TAG_common_block block in the current
15380 sym = new_symbol (child_die, NULL, cu);
15383 struct attribute *member_loc;
15385 common_block->contents[common_block->n_entries++] = sym;
15387 member_loc = dwarf2_attr (child_die, DW_AT_data_member_location,
15391 /* GDB has handled this for a long time, but it is
15392 not specified by DWARF. It seems to have been
15393 emitted by gfortran at least as recently as:
15394 http://gcc.gnu.org/bugzilla/show_bug.cgi?id=23057. */
15395 complaint (&symfile_complaints,
15396 _("Variable in common block has "
15397 "DW_AT_data_member_location "
15398 "- DIE at 0x%x [in module %s]"),
15399 to_underlying (child_die->sect_off),
15400 objfile_name (cu->objfile));
15402 if (attr_form_is_section_offset (member_loc))
15403 dwarf2_complex_location_expr_complaint ();
15404 else if (attr_form_is_constant (member_loc)
15405 || attr_form_is_block (member_loc))
15408 mark_common_block_symbol_computed (sym, die, attr,
15412 dwarf2_complex_location_expr_complaint ();
15417 sym = new_symbol (die, objfile_type (objfile)->builtin_void, cu);
15418 SYMBOL_VALUE_COMMON_BLOCK (sym) = common_block;
15422 /* Create a type for a C++ namespace. */
15424 static struct type *
15425 read_namespace_type (struct die_info *die, struct dwarf2_cu *cu)
15427 struct objfile *objfile = cu->objfile;
15428 const char *previous_prefix, *name;
15432 /* For extensions, reuse the type of the original namespace. */
15433 if (dwarf2_attr (die, DW_AT_extension, cu) != NULL)
15435 struct die_info *ext_die;
15436 struct dwarf2_cu *ext_cu = cu;
15438 ext_die = dwarf2_extension (die, &ext_cu);
15439 type = read_type_die (ext_die, ext_cu);
15441 /* EXT_CU may not be the same as CU.
15442 Ensure TYPE is recorded with CU in die_type_hash. */
15443 return set_die_type (die, type, cu);
15446 name = namespace_name (die, &is_anonymous, cu);
15448 /* Now build the name of the current namespace. */
15450 previous_prefix = determine_prefix (die, cu);
15451 if (previous_prefix[0] != '\0')
15452 name = typename_concat (&objfile->objfile_obstack,
15453 previous_prefix, name, 0, cu);
15455 /* Create the type. */
15456 type = init_type (objfile, TYPE_CODE_NAMESPACE, 0, name);
15457 TYPE_TAG_NAME (type) = TYPE_NAME (type);
15459 return set_die_type (die, type, cu);
15462 /* Read a namespace scope. */
15465 read_namespace (struct die_info *die, struct dwarf2_cu *cu)
15467 struct objfile *objfile = cu->objfile;
15470 /* Add a symbol associated to this if we haven't seen the namespace
15471 before. Also, add a using directive if it's an anonymous
15474 if (dwarf2_attr (die, DW_AT_extension, cu) == NULL)
15478 type = read_type_die (die, cu);
15479 new_symbol (die, type, cu);
15481 namespace_name (die, &is_anonymous, cu);
15484 const char *previous_prefix = determine_prefix (die, cu);
15486 std::vector<const char *> excludes;
15487 add_using_directive (using_directives (cu->language),
15488 previous_prefix, TYPE_NAME (type), NULL,
15489 NULL, excludes, 0, &objfile->objfile_obstack);
15493 if (die->child != NULL)
15495 struct die_info *child_die = die->child;
15497 while (child_die && child_die->tag)
15499 process_die (child_die, cu);
15500 child_die = sibling_die (child_die);
15505 /* Read a Fortran module as type. This DIE can be only a declaration used for
15506 imported module. Still we need that type as local Fortran "use ... only"
15507 declaration imports depend on the created type in determine_prefix. */
15509 static struct type *
15510 read_module_type (struct die_info *die, struct dwarf2_cu *cu)
15512 struct objfile *objfile = cu->objfile;
15513 const char *module_name;
15516 module_name = dwarf2_name (die, cu);
15518 complaint (&symfile_complaints,
15519 _("DW_TAG_module has no name, offset 0x%x"),
15520 to_underlying (die->sect_off));
15521 type = init_type (objfile, TYPE_CODE_MODULE, 0, module_name);
15523 /* determine_prefix uses TYPE_TAG_NAME. */
15524 TYPE_TAG_NAME (type) = TYPE_NAME (type);
15526 return set_die_type (die, type, cu);
15529 /* Read a Fortran module. */
15532 read_module (struct die_info *die, struct dwarf2_cu *cu)
15534 struct die_info *child_die = die->child;
15537 type = read_type_die (die, cu);
15538 new_symbol (die, type, cu);
15540 while (child_die && child_die->tag)
15542 process_die (child_die, cu);
15543 child_die = sibling_die (child_die);
15547 /* Return the name of the namespace represented by DIE. Set
15548 *IS_ANONYMOUS to tell whether or not the namespace is an anonymous
15551 static const char *
15552 namespace_name (struct die_info *die, int *is_anonymous, struct dwarf2_cu *cu)
15554 struct die_info *current_die;
15555 const char *name = NULL;
15557 /* Loop through the extensions until we find a name. */
15559 for (current_die = die;
15560 current_die != NULL;
15561 current_die = dwarf2_extension (die, &cu))
15563 /* We don't use dwarf2_name here so that we can detect the absence
15564 of a name -> anonymous namespace. */
15565 name = dwarf2_string_attr (die, DW_AT_name, cu);
15571 /* Is it an anonymous namespace? */
15573 *is_anonymous = (name == NULL);
15575 name = CP_ANONYMOUS_NAMESPACE_STR;
15580 /* Extract all information from a DW_TAG_pointer_type DIE and add to
15581 the user defined type vector. */
15583 static struct type *
15584 read_tag_pointer_type (struct die_info *die, struct dwarf2_cu *cu)
15586 struct gdbarch *gdbarch = get_objfile_arch (cu->objfile);
15587 struct comp_unit_head *cu_header = &cu->header;
15589 struct attribute *attr_byte_size;
15590 struct attribute *attr_address_class;
15591 int byte_size, addr_class;
15592 struct type *target_type;
15594 target_type = die_type (die, cu);
15596 /* The die_type call above may have already set the type for this DIE. */
15597 type = get_die_type (die, cu);
15601 type = lookup_pointer_type (target_type);
15603 attr_byte_size = dwarf2_attr (die, DW_AT_byte_size, cu);
15604 if (attr_byte_size)
15605 byte_size = DW_UNSND (attr_byte_size);
15607 byte_size = cu_header->addr_size;
15609 attr_address_class = dwarf2_attr (die, DW_AT_address_class, cu);
15610 if (attr_address_class)
15611 addr_class = DW_UNSND (attr_address_class);
15613 addr_class = DW_ADDR_none;
15615 /* If the pointer size or address class is different than the
15616 default, create a type variant marked as such and set the
15617 length accordingly. */
15618 if (TYPE_LENGTH (type) != byte_size || addr_class != DW_ADDR_none)
15620 if (gdbarch_address_class_type_flags_p (gdbarch))
15624 type_flags = gdbarch_address_class_type_flags
15625 (gdbarch, byte_size, addr_class);
15626 gdb_assert ((type_flags & ~TYPE_INSTANCE_FLAG_ADDRESS_CLASS_ALL)
15628 type = make_type_with_address_space (type, type_flags);
15630 else if (TYPE_LENGTH (type) != byte_size)
15632 complaint (&symfile_complaints,
15633 _("invalid pointer size %d"), byte_size);
15637 /* Should we also complain about unhandled address classes? */
15641 TYPE_LENGTH (type) = byte_size;
15642 return set_die_type (die, type, cu);
15645 /* Extract all information from a DW_TAG_ptr_to_member_type DIE and add to
15646 the user defined type vector. */
15648 static struct type *
15649 read_tag_ptr_to_member_type (struct die_info *die, struct dwarf2_cu *cu)
15652 struct type *to_type;
15653 struct type *domain;
15655 to_type = die_type (die, cu);
15656 domain = die_containing_type (die, cu);
15658 /* The calls above may have already set the type for this DIE. */
15659 type = get_die_type (die, cu);
15663 if (TYPE_CODE (check_typedef (to_type)) == TYPE_CODE_METHOD)
15664 type = lookup_methodptr_type (to_type);
15665 else if (TYPE_CODE (check_typedef (to_type)) == TYPE_CODE_FUNC)
15667 struct type *new_type = alloc_type (cu->objfile);
15669 smash_to_method_type (new_type, domain, TYPE_TARGET_TYPE (to_type),
15670 TYPE_FIELDS (to_type), TYPE_NFIELDS (to_type),
15671 TYPE_VARARGS (to_type));
15672 type = lookup_methodptr_type (new_type);
15675 type = lookup_memberptr_type (to_type, domain);
15677 return set_die_type (die, type, cu);
15680 /* Extract all information from a DW_TAG_{rvalue_,}reference_type DIE and add to
15681 the user defined type vector. */
15683 static struct type *
15684 read_tag_reference_type (struct die_info *die, struct dwarf2_cu *cu,
15685 enum type_code refcode)
15687 struct comp_unit_head *cu_header = &cu->header;
15688 struct type *type, *target_type;
15689 struct attribute *attr;
15691 gdb_assert (refcode == TYPE_CODE_REF || refcode == TYPE_CODE_RVALUE_REF);
15693 target_type = die_type (die, cu);
15695 /* The die_type call above may have already set the type for this DIE. */
15696 type = get_die_type (die, cu);
15700 type = lookup_reference_type (target_type, refcode);
15701 attr = dwarf2_attr (die, DW_AT_byte_size, cu);
15704 TYPE_LENGTH (type) = DW_UNSND (attr);
15708 TYPE_LENGTH (type) = cu_header->addr_size;
15710 return set_die_type (die, type, cu);
15713 /* Add the given cv-qualifiers to the element type of the array. GCC
15714 outputs DWARF type qualifiers that apply to an array, not the
15715 element type. But GDB relies on the array element type to carry
15716 the cv-qualifiers. This mimics section 6.7.3 of the C99
15719 static struct type *
15720 add_array_cv_type (struct die_info *die, struct dwarf2_cu *cu,
15721 struct type *base_type, int cnst, int voltl)
15723 struct type *el_type, *inner_array;
15725 base_type = copy_type (base_type);
15726 inner_array = base_type;
15728 while (TYPE_CODE (TYPE_TARGET_TYPE (inner_array)) == TYPE_CODE_ARRAY)
15730 TYPE_TARGET_TYPE (inner_array) =
15731 copy_type (TYPE_TARGET_TYPE (inner_array));
15732 inner_array = TYPE_TARGET_TYPE (inner_array);
15735 el_type = TYPE_TARGET_TYPE (inner_array);
15736 cnst |= TYPE_CONST (el_type);
15737 voltl |= TYPE_VOLATILE (el_type);
15738 TYPE_TARGET_TYPE (inner_array) = make_cv_type (cnst, voltl, el_type, NULL);
15740 return set_die_type (die, base_type, cu);
15743 static struct type *
15744 read_tag_const_type (struct die_info *die, struct dwarf2_cu *cu)
15746 struct type *base_type, *cv_type;
15748 base_type = die_type (die, cu);
15750 /* The die_type call above may have already set the type for this DIE. */
15751 cv_type = get_die_type (die, cu);
15755 /* In case the const qualifier is applied to an array type, the element type
15756 is so qualified, not the array type (section 6.7.3 of C99). */
15757 if (TYPE_CODE (base_type) == TYPE_CODE_ARRAY)
15758 return add_array_cv_type (die, cu, base_type, 1, 0);
15760 cv_type = make_cv_type (1, TYPE_VOLATILE (base_type), base_type, 0);
15761 return set_die_type (die, cv_type, cu);
15764 static struct type *
15765 read_tag_volatile_type (struct die_info *die, struct dwarf2_cu *cu)
15767 struct type *base_type, *cv_type;
15769 base_type = die_type (die, cu);
15771 /* The die_type call above may have already set the type for this DIE. */
15772 cv_type = get_die_type (die, cu);
15776 /* In case the volatile qualifier is applied to an array type, the
15777 element type is so qualified, not the array type (section 6.7.3
15779 if (TYPE_CODE (base_type) == TYPE_CODE_ARRAY)
15780 return add_array_cv_type (die, cu, base_type, 0, 1);
15782 cv_type = make_cv_type (TYPE_CONST (base_type), 1, base_type, 0);
15783 return set_die_type (die, cv_type, cu);
15786 /* Handle DW_TAG_restrict_type. */
15788 static struct type *
15789 read_tag_restrict_type (struct die_info *die, struct dwarf2_cu *cu)
15791 struct type *base_type, *cv_type;
15793 base_type = die_type (die, cu);
15795 /* The die_type call above may have already set the type for this DIE. */
15796 cv_type = get_die_type (die, cu);
15800 cv_type = make_restrict_type (base_type);
15801 return set_die_type (die, cv_type, cu);
15804 /* Handle DW_TAG_atomic_type. */
15806 static struct type *
15807 read_tag_atomic_type (struct die_info *die, struct dwarf2_cu *cu)
15809 struct type *base_type, *cv_type;
15811 base_type = die_type (die, cu);
15813 /* The die_type call above may have already set the type for this DIE. */
15814 cv_type = get_die_type (die, cu);
15818 cv_type = make_atomic_type (base_type);
15819 return set_die_type (die, cv_type, cu);
15822 /* Extract all information from a DW_TAG_string_type DIE and add to
15823 the user defined type vector. It isn't really a user defined type,
15824 but it behaves like one, with other DIE's using an AT_user_def_type
15825 attribute to reference it. */
15827 static struct type *
15828 read_tag_string_type (struct die_info *die, struct dwarf2_cu *cu)
15830 struct objfile *objfile = cu->objfile;
15831 struct gdbarch *gdbarch = get_objfile_arch (objfile);
15832 struct type *type, *range_type, *index_type, *char_type;
15833 struct attribute *attr;
15834 unsigned int length;
15836 attr = dwarf2_attr (die, DW_AT_string_length, cu);
15839 length = DW_UNSND (attr);
15843 /* Check for the DW_AT_byte_size attribute. */
15844 attr = dwarf2_attr (die, DW_AT_byte_size, cu);
15847 length = DW_UNSND (attr);
15855 index_type = objfile_type (objfile)->builtin_int;
15856 range_type = create_static_range_type (NULL, index_type, 1, length);
15857 char_type = language_string_char_type (cu->language_defn, gdbarch);
15858 type = create_string_type (NULL, char_type, range_type);
15860 return set_die_type (die, type, cu);
15863 /* Assuming that DIE corresponds to a function, returns nonzero
15864 if the function is prototyped. */
15867 prototyped_function_p (struct die_info *die, struct dwarf2_cu *cu)
15869 struct attribute *attr;
15871 attr = dwarf2_attr (die, DW_AT_prototyped, cu);
15872 if (attr && (DW_UNSND (attr) != 0))
15875 /* The DWARF standard implies that the DW_AT_prototyped attribute
15876 is only meaninful for C, but the concept also extends to other
15877 languages that allow unprototyped functions (Eg: Objective C).
15878 For all other languages, assume that functions are always
15880 if (cu->language != language_c
15881 && cu->language != language_objc
15882 && cu->language != language_opencl)
15885 /* RealView does not emit DW_AT_prototyped. We can not distinguish
15886 prototyped and unprototyped functions; default to prototyped,
15887 since that is more common in modern code (and RealView warns
15888 about unprototyped functions). */
15889 if (producer_is_realview (cu->producer))
15895 /* Handle DIES due to C code like:
15899 int (*funcp)(int a, long l);
15903 ('funcp' generates a DW_TAG_subroutine_type DIE). */
15905 static struct type *
15906 read_subroutine_type (struct die_info *die, struct dwarf2_cu *cu)
15908 struct objfile *objfile = cu->objfile;
15909 struct type *type; /* Type that this function returns. */
15910 struct type *ftype; /* Function that returns above type. */
15911 struct attribute *attr;
15913 type = die_type (die, cu);
15915 /* The die_type call above may have already set the type for this DIE. */
15916 ftype = get_die_type (die, cu);
15920 ftype = lookup_function_type (type);
15922 if (prototyped_function_p (die, cu))
15923 TYPE_PROTOTYPED (ftype) = 1;
15925 /* Store the calling convention in the type if it's available in
15926 the subroutine die. Otherwise set the calling convention to
15927 the default value DW_CC_normal. */
15928 attr = dwarf2_attr (die, DW_AT_calling_convention, cu);
15930 TYPE_CALLING_CONVENTION (ftype) = DW_UNSND (attr);
15931 else if (cu->producer && strstr (cu->producer, "IBM XL C for OpenCL"))
15932 TYPE_CALLING_CONVENTION (ftype) = DW_CC_GDB_IBM_OpenCL;
15934 TYPE_CALLING_CONVENTION (ftype) = DW_CC_normal;
15936 /* Record whether the function returns normally to its caller or not
15937 if the DWARF producer set that information. */
15938 attr = dwarf2_attr (die, DW_AT_noreturn, cu);
15939 if (attr && (DW_UNSND (attr) != 0))
15940 TYPE_NO_RETURN (ftype) = 1;
15942 /* We need to add the subroutine type to the die immediately so
15943 we don't infinitely recurse when dealing with parameters
15944 declared as the same subroutine type. */
15945 set_die_type (die, ftype, cu);
15947 if (die->child != NULL)
15949 struct type *void_type = objfile_type (objfile)->builtin_void;
15950 struct die_info *child_die;
15951 int nparams, iparams;
15953 /* Count the number of parameters.
15954 FIXME: GDB currently ignores vararg functions, but knows about
15955 vararg member functions. */
15957 child_die = die->child;
15958 while (child_die && child_die->tag)
15960 if (child_die->tag == DW_TAG_formal_parameter)
15962 else if (child_die->tag == DW_TAG_unspecified_parameters)
15963 TYPE_VARARGS (ftype) = 1;
15964 child_die = sibling_die (child_die);
15967 /* Allocate storage for parameters and fill them in. */
15968 TYPE_NFIELDS (ftype) = nparams;
15969 TYPE_FIELDS (ftype) = (struct field *)
15970 TYPE_ZALLOC (ftype, nparams * sizeof (struct field));
15972 /* TYPE_FIELD_TYPE must never be NULL. Pre-fill the array to ensure it
15973 even if we error out during the parameters reading below. */
15974 for (iparams = 0; iparams < nparams; iparams++)
15975 TYPE_FIELD_TYPE (ftype, iparams) = void_type;
15978 child_die = die->child;
15979 while (child_die && child_die->tag)
15981 if (child_die->tag == DW_TAG_formal_parameter)
15983 struct type *arg_type;
15985 /* DWARF version 2 has no clean way to discern C++
15986 static and non-static member functions. G++ helps
15987 GDB by marking the first parameter for non-static
15988 member functions (which is the this pointer) as
15989 artificial. We pass this information to
15990 dwarf2_add_member_fn via TYPE_FIELD_ARTIFICIAL.
15992 DWARF version 3 added DW_AT_object_pointer, which GCC
15993 4.5 does not yet generate. */
15994 attr = dwarf2_attr (child_die, DW_AT_artificial, cu);
15996 TYPE_FIELD_ARTIFICIAL (ftype, iparams) = DW_UNSND (attr);
15998 TYPE_FIELD_ARTIFICIAL (ftype, iparams) = 0;
15999 arg_type = die_type (child_die, cu);
16001 /* RealView does not mark THIS as const, which the testsuite
16002 expects. GCC marks THIS as const in method definitions,
16003 but not in the class specifications (GCC PR 43053). */
16004 if (cu->language == language_cplus && !TYPE_CONST (arg_type)
16005 && TYPE_FIELD_ARTIFICIAL (ftype, iparams))
16008 struct dwarf2_cu *arg_cu = cu;
16009 const char *name = dwarf2_name (child_die, cu);
16011 attr = dwarf2_attr (die, DW_AT_object_pointer, cu);
16014 /* If the compiler emits this, use it. */
16015 if (follow_die_ref (die, attr, &arg_cu) == child_die)
16018 else if (name && strcmp (name, "this") == 0)
16019 /* Function definitions will have the argument names. */
16021 else if (name == NULL && iparams == 0)
16022 /* Declarations may not have the names, so like
16023 elsewhere in GDB, assume an artificial first
16024 argument is "this". */
16028 arg_type = make_cv_type (1, TYPE_VOLATILE (arg_type),
16032 TYPE_FIELD_TYPE (ftype, iparams) = arg_type;
16035 child_die = sibling_die (child_die);
16042 static struct type *
16043 read_typedef (struct die_info *die, struct dwarf2_cu *cu)
16045 struct objfile *objfile = cu->objfile;
16046 const char *name = NULL;
16047 struct type *this_type, *target_type;
16049 name = dwarf2_full_name (NULL, die, cu);
16050 this_type = init_type (objfile, TYPE_CODE_TYPEDEF, 0, name);
16051 TYPE_TARGET_STUB (this_type) = 1;
16052 set_die_type (die, this_type, cu);
16053 target_type = die_type (die, cu);
16054 if (target_type != this_type)
16055 TYPE_TARGET_TYPE (this_type) = target_type;
16058 /* Self-referential typedefs are, it seems, not allowed by the DWARF
16059 spec and cause infinite loops in GDB. */
16060 complaint (&symfile_complaints,
16061 _("Self-referential DW_TAG_typedef "
16062 "- DIE at 0x%x [in module %s]"),
16063 to_underlying (die->sect_off), objfile_name (objfile));
16064 TYPE_TARGET_TYPE (this_type) = NULL;
16069 /* Allocate a floating-point type of size BITS and name NAME. Pass NAME_HINT
16070 (which may be different from NAME) to the architecture back-end to allow
16071 it to guess the correct format if necessary. */
16073 static struct type *
16074 dwarf2_init_float_type (struct objfile *objfile, int bits, const char *name,
16075 const char *name_hint)
16077 struct gdbarch *gdbarch = get_objfile_arch (objfile);
16078 const struct floatformat **format;
16081 format = gdbarch_floatformat_for_type (gdbarch, name_hint, bits);
16083 type = init_float_type (objfile, bits, name, format);
16085 type = init_type (objfile, TYPE_CODE_ERROR, bits, name);
16090 /* Find a representation of a given base type and install
16091 it in the TYPE field of the die. */
16093 static struct type *
16094 read_base_type (struct die_info *die, struct dwarf2_cu *cu)
16096 struct objfile *objfile = cu->objfile;
16098 struct attribute *attr;
16099 int encoding = 0, bits = 0;
16102 attr = dwarf2_attr (die, DW_AT_encoding, cu);
16105 encoding = DW_UNSND (attr);
16107 attr = dwarf2_attr (die, DW_AT_byte_size, cu);
16110 bits = DW_UNSND (attr) * TARGET_CHAR_BIT;
16112 name = dwarf2_name (die, cu);
16115 complaint (&symfile_complaints,
16116 _("DW_AT_name missing from DW_TAG_base_type"));
16121 case DW_ATE_address:
16122 /* Turn DW_ATE_address into a void * pointer. */
16123 type = init_type (objfile, TYPE_CODE_VOID, TARGET_CHAR_BIT, NULL);
16124 type = init_pointer_type (objfile, bits, name, type);
16126 case DW_ATE_boolean:
16127 type = init_boolean_type (objfile, bits, 1, name);
16129 case DW_ATE_complex_float:
16130 type = dwarf2_init_float_type (objfile, bits / 2, NULL, name);
16131 type = init_complex_type (objfile, name, type);
16133 case DW_ATE_decimal_float:
16134 type = init_decfloat_type (objfile, bits, name);
16137 type = dwarf2_init_float_type (objfile, bits, name, name);
16139 case DW_ATE_signed:
16140 type = init_integer_type (objfile, bits, 0, name);
16142 case DW_ATE_unsigned:
16143 if (cu->language == language_fortran
16145 && startswith (name, "character("))
16146 type = init_character_type (objfile, bits, 1, name);
16148 type = init_integer_type (objfile, bits, 1, name);
16150 case DW_ATE_signed_char:
16151 if (cu->language == language_ada || cu->language == language_m2
16152 || cu->language == language_pascal
16153 || cu->language == language_fortran)
16154 type = init_character_type (objfile, bits, 0, name);
16156 type = init_integer_type (objfile, bits, 0, name);
16158 case DW_ATE_unsigned_char:
16159 if (cu->language == language_ada || cu->language == language_m2
16160 || cu->language == language_pascal
16161 || cu->language == language_fortran
16162 || cu->language == language_rust)
16163 type = init_character_type (objfile, bits, 1, name);
16165 type = init_integer_type (objfile, bits, 1, name);
16169 gdbarch *arch = get_objfile_arch (objfile);
16172 type = builtin_type (arch)->builtin_char16;
16173 else if (bits == 32)
16174 type = builtin_type (arch)->builtin_char32;
16177 complaint (&symfile_complaints,
16178 _("unsupported DW_ATE_UTF bit size: '%d'"),
16180 type = init_integer_type (objfile, bits, 1, name);
16182 return set_die_type (die, type, cu);
16187 complaint (&symfile_complaints, _("unsupported DW_AT_encoding: '%s'"),
16188 dwarf_type_encoding_name (encoding));
16189 type = init_type (objfile, TYPE_CODE_ERROR, bits, name);
16193 if (name && strcmp (name, "char") == 0)
16194 TYPE_NOSIGN (type) = 1;
16196 return set_die_type (die, type, cu);
16199 /* Parse dwarf attribute if it's a block, reference or constant and put the
16200 resulting value of the attribute into struct bound_prop.
16201 Returns 1 if ATTR could be resolved into PROP, 0 otherwise. */
16204 attr_to_dynamic_prop (const struct attribute *attr, struct die_info *die,
16205 struct dwarf2_cu *cu, struct dynamic_prop *prop)
16207 struct dwarf2_property_baton *baton;
16208 struct obstack *obstack = &cu->objfile->objfile_obstack;
16210 if (attr == NULL || prop == NULL)
16213 if (attr_form_is_block (attr))
16215 baton = XOBNEW (obstack, struct dwarf2_property_baton);
16216 baton->referenced_type = NULL;
16217 baton->locexpr.per_cu = cu->per_cu;
16218 baton->locexpr.size = DW_BLOCK (attr)->size;
16219 baton->locexpr.data = DW_BLOCK (attr)->data;
16220 prop->data.baton = baton;
16221 prop->kind = PROP_LOCEXPR;
16222 gdb_assert (prop->data.baton != NULL);
16224 else if (attr_form_is_ref (attr))
16226 struct dwarf2_cu *target_cu = cu;
16227 struct die_info *target_die;
16228 struct attribute *target_attr;
16230 target_die = follow_die_ref (die, attr, &target_cu);
16231 target_attr = dwarf2_attr (target_die, DW_AT_location, target_cu);
16232 if (target_attr == NULL)
16233 target_attr = dwarf2_attr (target_die, DW_AT_data_member_location,
16235 if (target_attr == NULL)
16238 switch (target_attr->name)
16240 case DW_AT_location:
16241 if (attr_form_is_section_offset (target_attr))
16243 baton = XOBNEW (obstack, struct dwarf2_property_baton);
16244 baton->referenced_type = die_type (target_die, target_cu);
16245 fill_in_loclist_baton (cu, &baton->loclist, target_attr);
16246 prop->data.baton = baton;
16247 prop->kind = PROP_LOCLIST;
16248 gdb_assert (prop->data.baton != NULL);
16250 else if (attr_form_is_block (target_attr))
16252 baton = XOBNEW (obstack, struct dwarf2_property_baton);
16253 baton->referenced_type = die_type (target_die, target_cu);
16254 baton->locexpr.per_cu = cu->per_cu;
16255 baton->locexpr.size = DW_BLOCK (target_attr)->size;
16256 baton->locexpr.data = DW_BLOCK (target_attr)->data;
16257 prop->data.baton = baton;
16258 prop->kind = PROP_LOCEXPR;
16259 gdb_assert (prop->data.baton != NULL);
16263 dwarf2_invalid_attrib_class_complaint ("DW_AT_location",
16264 "dynamic property");
16268 case DW_AT_data_member_location:
16272 if (!handle_data_member_location (target_die, target_cu,
16276 baton = XOBNEW (obstack, struct dwarf2_property_baton);
16277 baton->referenced_type = read_type_die (target_die->parent,
16279 baton->offset_info.offset = offset;
16280 baton->offset_info.type = die_type (target_die, target_cu);
16281 prop->data.baton = baton;
16282 prop->kind = PROP_ADDR_OFFSET;
16287 else if (attr_form_is_constant (attr))
16289 prop->data.const_val = dwarf2_get_attr_constant_value (attr, 0);
16290 prop->kind = PROP_CONST;
16294 dwarf2_invalid_attrib_class_complaint (dwarf_form_name (attr->form),
16295 dwarf2_name (die, cu));
16302 /* Read the given DW_AT_subrange DIE. */
16304 static struct type *
16305 read_subrange_type (struct die_info *die, struct dwarf2_cu *cu)
16307 struct type *base_type, *orig_base_type;
16308 struct type *range_type;
16309 struct attribute *attr;
16310 struct dynamic_prop low, high;
16311 int low_default_is_valid;
16312 int high_bound_is_count = 0;
16314 LONGEST negative_mask;
16316 orig_base_type = die_type (die, cu);
16317 /* If ORIG_BASE_TYPE is a typedef, it will not be TYPE_UNSIGNED,
16318 whereas the real type might be. So, we use ORIG_BASE_TYPE when
16319 creating the range type, but we use the result of check_typedef
16320 when examining properties of the type. */
16321 base_type = check_typedef (orig_base_type);
16323 /* The die_type call above may have already set the type for this DIE. */
16324 range_type = get_die_type (die, cu);
16328 low.kind = PROP_CONST;
16329 high.kind = PROP_CONST;
16330 high.data.const_val = 0;
16332 /* Set LOW_DEFAULT_IS_VALID if current language and DWARF version allow
16333 omitting DW_AT_lower_bound. */
16334 switch (cu->language)
16337 case language_cplus:
16338 low.data.const_val = 0;
16339 low_default_is_valid = 1;
16341 case language_fortran:
16342 low.data.const_val = 1;
16343 low_default_is_valid = 1;
16346 case language_objc:
16347 case language_rust:
16348 low.data.const_val = 0;
16349 low_default_is_valid = (cu->header.version >= 4);
16353 case language_pascal:
16354 low.data.const_val = 1;
16355 low_default_is_valid = (cu->header.version >= 4);
16358 low.data.const_val = 0;
16359 low_default_is_valid = 0;
16363 attr = dwarf2_attr (die, DW_AT_lower_bound, cu);
16365 attr_to_dynamic_prop (attr, die, cu, &low);
16366 else if (!low_default_is_valid)
16367 complaint (&symfile_complaints, _("Missing DW_AT_lower_bound "
16368 "- DIE at 0x%x [in module %s]"),
16369 to_underlying (die->sect_off), objfile_name (cu->objfile));
16371 attr = dwarf2_attr (die, DW_AT_upper_bound, cu);
16372 if (!attr_to_dynamic_prop (attr, die, cu, &high))
16374 attr = dwarf2_attr (die, DW_AT_count, cu);
16375 if (attr_to_dynamic_prop (attr, die, cu, &high))
16377 /* If bounds are constant do the final calculation here. */
16378 if (low.kind == PROP_CONST && high.kind == PROP_CONST)
16379 high.data.const_val = low.data.const_val + high.data.const_val - 1;
16381 high_bound_is_count = 1;
16385 /* Dwarf-2 specifications explicitly allows to create subrange types
16386 without specifying a base type.
16387 In that case, the base type must be set to the type of
16388 the lower bound, upper bound or count, in that order, if any of these
16389 three attributes references an object that has a type.
16390 If no base type is found, the Dwarf-2 specifications say that
16391 a signed integer type of size equal to the size of an address should
16393 For the following C code: `extern char gdb_int [];'
16394 GCC produces an empty range DIE.
16395 FIXME: muller/2010-05-28: Possible references to object for low bound,
16396 high bound or count are not yet handled by this code. */
16397 if (TYPE_CODE (base_type) == TYPE_CODE_VOID)
16399 struct objfile *objfile = cu->objfile;
16400 struct gdbarch *gdbarch = get_objfile_arch (objfile);
16401 int addr_size = gdbarch_addr_bit (gdbarch) /8;
16402 struct type *int_type = objfile_type (objfile)->builtin_int;
16404 /* Test "int", "long int", and "long long int" objfile types,
16405 and select the first one having a size above or equal to the
16406 architecture address size. */
16407 if (int_type && TYPE_LENGTH (int_type) >= addr_size)
16408 base_type = int_type;
16411 int_type = objfile_type (objfile)->builtin_long;
16412 if (int_type && TYPE_LENGTH (int_type) >= addr_size)
16413 base_type = int_type;
16416 int_type = objfile_type (objfile)->builtin_long_long;
16417 if (int_type && TYPE_LENGTH (int_type) >= addr_size)
16418 base_type = int_type;
16423 /* Normally, the DWARF producers are expected to use a signed
16424 constant form (Eg. DW_FORM_sdata) to express negative bounds.
16425 But this is unfortunately not always the case, as witnessed
16426 with GCC, for instance, where the ambiguous DW_FORM_dataN form
16427 is used instead. To work around that ambiguity, we treat
16428 the bounds as signed, and thus sign-extend their values, when
16429 the base type is signed. */
16431 -((LONGEST) 1 << (TYPE_LENGTH (base_type) * TARGET_CHAR_BIT - 1));
16432 if (low.kind == PROP_CONST
16433 && !TYPE_UNSIGNED (base_type) && (low.data.const_val & negative_mask))
16434 low.data.const_val |= negative_mask;
16435 if (high.kind == PROP_CONST
16436 && !TYPE_UNSIGNED (base_type) && (high.data.const_val & negative_mask))
16437 high.data.const_val |= negative_mask;
16439 range_type = create_range_type (NULL, orig_base_type, &low, &high);
16441 if (high_bound_is_count)
16442 TYPE_RANGE_DATA (range_type)->flag_upper_bound_is_count = 1;
16444 /* Ada expects an empty array on no boundary attributes. */
16445 if (attr == NULL && cu->language != language_ada)
16446 TYPE_HIGH_BOUND_KIND (range_type) = PROP_UNDEFINED;
16448 name = dwarf2_name (die, cu);
16450 TYPE_NAME (range_type) = name;
16452 attr = dwarf2_attr (die, DW_AT_byte_size, cu);
16454 TYPE_LENGTH (range_type) = DW_UNSND (attr);
16456 set_die_type (die, range_type, cu);
16458 /* set_die_type should be already done. */
16459 set_descriptive_type (range_type, die, cu);
16464 static struct type *
16465 read_unspecified_type (struct die_info *die, struct dwarf2_cu *cu)
16469 /* For now, we only support the C meaning of an unspecified type: void. */
16471 type = init_type (cu->objfile, TYPE_CODE_VOID, 0, NULL);
16472 TYPE_NAME (type) = dwarf2_name (die, cu);
16474 return set_die_type (die, type, cu);
16477 /* Read a single die and all its descendents. Set the die's sibling
16478 field to NULL; set other fields in the die correctly, and set all
16479 of the descendents' fields correctly. Set *NEW_INFO_PTR to the
16480 location of the info_ptr after reading all of those dies. PARENT
16481 is the parent of the die in question. */
16483 static struct die_info *
16484 read_die_and_children (const struct die_reader_specs *reader,
16485 const gdb_byte *info_ptr,
16486 const gdb_byte **new_info_ptr,
16487 struct die_info *parent)
16489 struct die_info *die;
16490 const gdb_byte *cur_ptr;
16493 cur_ptr = read_full_die_1 (reader, &die, info_ptr, &has_children, 0);
16496 *new_info_ptr = cur_ptr;
16499 store_in_ref_table (die, reader->cu);
16502 die->child = read_die_and_siblings_1 (reader, cur_ptr, new_info_ptr, die);
16506 *new_info_ptr = cur_ptr;
16509 die->sibling = NULL;
16510 die->parent = parent;
16514 /* Read a die, all of its descendents, and all of its siblings; set
16515 all of the fields of all of the dies correctly. Arguments are as
16516 in read_die_and_children. */
16518 static struct die_info *
16519 read_die_and_siblings_1 (const struct die_reader_specs *reader,
16520 const gdb_byte *info_ptr,
16521 const gdb_byte **new_info_ptr,
16522 struct die_info *parent)
16524 struct die_info *first_die, *last_sibling;
16525 const gdb_byte *cur_ptr;
16527 cur_ptr = info_ptr;
16528 first_die = last_sibling = NULL;
16532 struct die_info *die
16533 = read_die_and_children (reader, cur_ptr, &cur_ptr, parent);
16537 *new_info_ptr = cur_ptr;
16544 last_sibling->sibling = die;
16546 last_sibling = die;
16550 /* Read a die, all of its descendents, and all of its siblings; set
16551 all of the fields of all of the dies correctly. Arguments are as
16552 in read_die_and_children.
16553 This the main entry point for reading a DIE and all its children. */
16555 static struct die_info *
16556 read_die_and_siblings (const struct die_reader_specs *reader,
16557 const gdb_byte *info_ptr,
16558 const gdb_byte **new_info_ptr,
16559 struct die_info *parent)
16561 struct die_info *die = read_die_and_siblings_1 (reader, info_ptr,
16562 new_info_ptr, parent);
16564 if (dwarf_die_debug)
16566 fprintf_unfiltered (gdb_stdlog,
16567 "Read die from %s@0x%x of %s:\n",
16568 get_section_name (reader->die_section),
16569 (unsigned) (info_ptr - reader->die_section->buffer),
16570 bfd_get_filename (reader->abfd));
16571 dump_die (die, dwarf_die_debug);
16577 /* Read a die and all its attributes, leave space for NUM_EXTRA_ATTRS
16579 The caller is responsible for filling in the extra attributes
16580 and updating (*DIEP)->num_attrs.
16581 Set DIEP to point to a newly allocated die with its information,
16582 except for its child, sibling, and parent fields.
16583 Set HAS_CHILDREN to tell whether the die has children or not. */
16585 static const gdb_byte *
16586 read_full_die_1 (const struct die_reader_specs *reader,
16587 struct die_info **diep, const gdb_byte *info_ptr,
16588 int *has_children, int num_extra_attrs)
16590 unsigned int abbrev_number, bytes_read, i;
16591 struct abbrev_info *abbrev;
16592 struct die_info *die;
16593 struct dwarf2_cu *cu = reader->cu;
16594 bfd *abfd = reader->abfd;
16596 sect_offset sect_off = (sect_offset) (info_ptr - reader->buffer);
16597 abbrev_number = read_unsigned_leb128 (abfd, info_ptr, &bytes_read);
16598 info_ptr += bytes_read;
16599 if (!abbrev_number)
16606 abbrev = abbrev_table_lookup_abbrev (cu->abbrev_table, abbrev_number);
16608 error (_("Dwarf Error: could not find abbrev number %d [in module %s]"),
16610 bfd_get_filename (abfd));
16612 die = dwarf_alloc_die (cu, abbrev->num_attrs + num_extra_attrs);
16613 die->sect_off = sect_off;
16614 die->tag = abbrev->tag;
16615 die->abbrev = abbrev_number;
16617 /* Make the result usable.
16618 The caller needs to update num_attrs after adding the extra
16620 die->num_attrs = abbrev->num_attrs;
16622 for (i = 0; i < abbrev->num_attrs; ++i)
16623 info_ptr = read_attribute (reader, &die->attrs[i], &abbrev->attrs[i],
16627 *has_children = abbrev->has_children;
16631 /* Read a die and all its attributes.
16632 Set DIEP to point to a newly allocated die with its information,
16633 except for its child, sibling, and parent fields.
16634 Set HAS_CHILDREN to tell whether the die has children or not. */
16636 static const gdb_byte *
16637 read_full_die (const struct die_reader_specs *reader,
16638 struct die_info **diep, const gdb_byte *info_ptr,
16641 const gdb_byte *result;
16643 result = read_full_die_1 (reader, diep, info_ptr, has_children, 0);
16645 if (dwarf_die_debug)
16647 fprintf_unfiltered (gdb_stdlog,
16648 "Read die from %s@0x%x of %s:\n",
16649 get_section_name (reader->die_section),
16650 (unsigned) (info_ptr - reader->die_section->buffer),
16651 bfd_get_filename (reader->abfd));
16652 dump_die (*diep, dwarf_die_debug);
16658 /* Abbreviation tables.
16660 In DWARF version 2, the description of the debugging information is
16661 stored in a separate .debug_abbrev section. Before we read any
16662 dies from a section we read in all abbreviations and install them
16663 in a hash table. */
16665 /* Allocate space for a struct abbrev_info object in ABBREV_TABLE. */
16667 static struct abbrev_info *
16668 abbrev_table_alloc_abbrev (struct abbrev_table *abbrev_table)
16670 struct abbrev_info *abbrev;
16672 abbrev = XOBNEW (&abbrev_table->abbrev_obstack, struct abbrev_info);
16673 memset (abbrev, 0, sizeof (struct abbrev_info));
16678 /* Add an abbreviation to the table. */
16681 abbrev_table_add_abbrev (struct abbrev_table *abbrev_table,
16682 unsigned int abbrev_number,
16683 struct abbrev_info *abbrev)
16685 unsigned int hash_number;
16687 hash_number = abbrev_number % ABBREV_HASH_SIZE;
16688 abbrev->next = abbrev_table->abbrevs[hash_number];
16689 abbrev_table->abbrevs[hash_number] = abbrev;
16692 /* Look up an abbrev in the table.
16693 Returns NULL if the abbrev is not found. */
16695 static struct abbrev_info *
16696 abbrev_table_lookup_abbrev (const struct abbrev_table *abbrev_table,
16697 unsigned int abbrev_number)
16699 unsigned int hash_number;
16700 struct abbrev_info *abbrev;
16702 hash_number = abbrev_number % ABBREV_HASH_SIZE;
16703 abbrev = abbrev_table->abbrevs[hash_number];
16707 if (abbrev->number == abbrev_number)
16709 abbrev = abbrev->next;
16714 /* Read in an abbrev table. */
16716 static struct abbrev_table *
16717 abbrev_table_read_table (struct dwarf2_section_info *section,
16718 sect_offset sect_off)
16720 struct objfile *objfile = dwarf2_per_objfile->objfile;
16721 bfd *abfd = get_section_bfd_owner (section);
16722 struct abbrev_table *abbrev_table;
16723 const gdb_byte *abbrev_ptr;
16724 struct abbrev_info *cur_abbrev;
16725 unsigned int abbrev_number, bytes_read, abbrev_name;
16726 unsigned int abbrev_form;
16727 struct attr_abbrev *cur_attrs;
16728 unsigned int allocated_attrs;
16730 abbrev_table = XNEW (struct abbrev_table);
16731 abbrev_table->sect_off = sect_off;
16732 obstack_init (&abbrev_table->abbrev_obstack);
16733 abbrev_table->abbrevs =
16734 XOBNEWVEC (&abbrev_table->abbrev_obstack, struct abbrev_info *,
16736 memset (abbrev_table->abbrevs, 0,
16737 ABBREV_HASH_SIZE * sizeof (struct abbrev_info *));
16739 dwarf2_read_section (objfile, section);
16740 abbrev_ptr = section->buffer + to_underlying (sect_off);
16741 abbrev_number = read_unsigned_leb128 (abfd, abbrev_ptr, &bytes_read);
16742 abbrev_ptr += bytes_read;
16744 allocated_attrs = ATTR_ALLOC_CHUNK;
16745 cur_attrs = XNEWVEC (struct attr_abbrev, allocated_attrs);
16747 /* Loop until we reach an abbrev number of 0. */
16748 while (abbrev_number)
16750 cur_abbrev = abbrev_table_alloc_abbrev (abbrev_table);
16752 /* read in abbrev header */
16753 cur_abbrev->number = abbrev_number;
16755 = (enum dwarf_tag) read_unsigned_leb128 (abfd, abbrev_ptr, &bytes_read);
16756 abbrev_ptr += bytes_read;
16757 cur_abbrev->has_children = read_1_byte (abfd, abbrev_ptr);
16760 /* now read in declarations */
16763 LONGEST implicit_const;
16765 abbrev_name = read_unsigned_leb128 (abfd, abbrev_ptr, &bytes_read);
16766 abbrev_ptr += bytes_read;
16767 abbrev_form = read_unsigned_leb128 (abfd, abbrev_ptr, &bytes_read);
16768 abbrev_ptr += bytes_read;
16769 if (abbrev_form == DW_FORM_implicit_const)
16771 implicit_const = read_signed_leb128 (abfd, abbrev_ptr,
16773 abbrev_ptr += bytes_read;
16777 /* Initialize it due to a false compiler warning. */
16778 implicit_const = -1;
16781 if (abbrev_name == 0)
16784 if (cur_abbrev->num_attrs == allocated_attrs)
16786 allocated_attrs += ATTR_ALLOC_CHUNK;
16788 = XRESIZEVEC (struct attr_abbrev, cur_attrs, allocated_attrs);
16791 cur_attrs[cur_abbrev->num_attrs].name
16792 = (enum dwarf_attribute) abbrev_name;
16793 cur_attrs[cur_abbrev->num_attrs].form
16794 = (enum dwarf_form) abbrev_form;
16795 cur_attrs[cur_abbrev->num_attrs].implicit_const = implicit_const;
16796 ++cur_abbrev->num_attrs;
16799 cur_abbrev->attrs =
16800 XOBNEWVEC (&abbrev_table->abbrev_obstack, struct attr_abbrev,
16801 cur_abbrev->num_attrs);
16802 memcpy (cur_abbrev->attrs, cur_attrs,
16803 cur_abbrev->num_attrs * sizeof (struct attr_abbrev));
16805 abbrev_table_add_abbrev (abbrev_table, abbrev_number, cur_abbrev);
16807 /* Get next abbreviation.
16808 Under Irix6 the abbreviations for a compilation unit are not
16809 always properly terminated with an abbrev number of 0.
16810 Exit loop if we encounter an abbreviation which we have
16811 already read (which means we are about to read the abbreviations
16812 for the next compile unit) or if the end of the abbreviation
16813 table is reached. */
16814 if ((unsigned int) (abbrev_ptr - section->buffer) >= section->size)
16816 abbrev_number = read_unsigned_leb128 (abfd, abbrev_ptr, &bytes_read);
16817 abbrev_ptr += bytes_read;
16818 if (abbrev_table_lookup_abbrev (abbrev_table, abbrev_number) != NULL)
16823 return abbrev_table;
16826 /* Free the resources held by ABBREV_TABLE. */
16829 abbrev_table_free (struct abbrev_table *abbrev_table)
16831 obstack_free (&abbrev_table->abbrev_obstack, NULL);
16832 xfree (abbrev_table);
16835 /* Same as abbrev_table_free but as a cleanup.
16836 We pass in a pointer to the pointer to the table so that we can
16837 set the pointer to NULL when we're done. It also simplifies
16838 build_type_psymtabs_1. */
16841 abbrev_table_free_cleanup (void *table_ptr)
16843 struct abbrev_table **abbrev_table_ptr = (struct abbrev_table **) table_ptr;
16845 if (*abbrev_table_ptr != NULL)
16846 abbrev_table_free (*abbrev_table_ptr);
16847 *abbrev_table_ptr = NULL;
16850 /* Read the abbrev table for CU from ABBREV_SECTION. */
16853 dwarf2_read_abbrevs (struct dwarf2_cu *cu,
16854 struct dwarf2_section_info *abbrev_section)
16857 abbrev_table_read_table (abbrev_section, cu->header.abbrev_sect_off);
16860 /* Release the memory used by the abbrev table for a compilation unit. */
16863 dwarf2_free_abbrev_table (void *ptr_to_cu)
16865 struct dwarf2_cu *cu = (struct dwarf2_cu *) ptr_to_cu;
16867 if (cu->abbrev_table != NULL)
16868 abbrev_table_free (cu->abbrev_table);
16869 /* Set this to NULL so that we SEGV if we try to read it later,
16870 and also because free_comp_unit verifies this is NULL. */
16871 cu->abbrev_table = NULL;
16874 /* Returns nonzero if TAG represents a type that we might generate a partial
16878 is_type_tag_for_partial (int tag)
16883 /* Some types that would be reasonable to generate partial symbols for,
16884 that we don't at present. */
16885 case DW_TAG_array_type:
16886 case DW_TAG_file_type:
16887 case DW_TAG_ptr_to_member_type:
16888 case DW_TAG_set_type:
16889 case DW_TAG_string_type:
16890 case DW_TAG_subroutine_type:
16892 case DW_TAG_base_type:
16893 case DW_TAG_class_type:
16894 case DW_TAG_interface_type:
16895 case DW_TAG_enumeration_type:
16896 case DW_TAG_structure_type:
16897 case DW_TAG_subrange_type:
16898 case DW_TAG_typedef:
16899 case DW_TAG_union_type:
16906 /* Load all DIEs that are interesting for partial symbols into memory. */
16908 static struct partial_die_info *
16909 load_partial_dies (const struct die_reader_specs *reader,
16910 const gdb_byte *info_ptr, int building_psymtab)
16912 struct dwarf2_cu *cu = reader->cu;
16913 struct objfile *objfile = cu->objfile;
16914 struct partial_die_info *part_die;
16915 struct partial_die_info *parent_die, *last_die, *first_die = NULL;
16916 struct abbrev_info *abbrev;
16917 unsigned int bytes_read;
16918 unsigned int load_all = 0;
16919 int nesting_level = 1;
16924 gdb_assert (cu->per_cu != NULL);
16925 if (cu->per_cu->load_all_dies)
16929 = htab_create_alloc_ex (cu->header.length / 12,
16933 &cu->comp_unit_obstack,
16934 hashtab_obstack_allocate,
16935 dummy_obstack_deallocate);
16937 part_die = XOBNEW (&cu->comp_unit_obstack, struct partial_die_info);
16941 abbrev = peek_die_abbrev (info_ptr, &bytes_read, cu);
16943 /* A NULL abbrev means the end of a series of children. */
16944 if (abbrev == NULL)
16946 if (--nesting_level == 0)
16948 /* PART_DIE was probably the last thing allocated on the
16949 comp_unit_obstack, so we could call obstack_free
16950 here. We don't do that because the waste is small,
16951 and will be cleaned up when we're done with this
16952 compilation unit. This way, we're also more robust
16953 against other users of the comp_unit_obstack. */
16956 info_ptr += bytes_read;
16957 last_die = parent_die;
16958 parent_die = parent_die->die_parent;
16962 /* Check for template arguments. We never save these; if
16963 they're seen, we just mark the parent, and go on our way. */
16964 if (parent_die != NULL
16965 && cu->language == language_cplus
16966 && (abbrev->tag == DW_TAG_template_type_param
16967 || abbrev->tag == DW_TAG_template_value_param))
16969 parent_die->has_template_arguments = 1;
16973 /* We don't need a partial DIE for the template argument. */
16974 info_ptr = skip_one_die (reader, info_ptr + bytes_read, abbrev);
16979 /* We only recurse into c++ subprograms looking for template arguments.
16980 Skip their other children. */
16982 && cu->language == language_cplus
16983 && parent_die != NULL
16984 && parent_die->tag == DW_TAG_subprogram)
16986 info_ptr = skip_one_die (reader, info_ptr + bytes_read, abbrev);
16990 /* Check whether this DIE is interesting enough to save. Normally
16991 we would not be interested in members here, but there may be
16992 later variables referencing them via DW_AT_specification (for
16993 static members). */
16995 && !is_type_tag_for_partial (abbrev->tag)
16996 && abbrev->tag != DW_TAG_constant
16997 && abbrev->tag != DW_TAG_enumerator
16998 && abbrev->tag != DW_TAG_subprogram
16999 && abbrev->tag != DW_TAG_lexical_block
17000 && abbrev->tag != DW_TAG_variable
17001 && abbrev->tag != DW_TAG_namespace
17002 && abbrev->tag != DW_TAG_module
17003 && abbrev->tag != DW_TAG_member
17004 && abbrev->tag != DW_TAG_imported_unit
17005 && abbrev->tag != DW_TAG_imported_declaration)
17007 /* Otherwise we skip to the next sibling, if any. */
17008 info_ptr = skip_one_die (reader, info_ptr + bytes_read, abbrev);
17012 info_ptr = read_partial_die (reader, part_die, abbrev, bytes_read,
17015 /* This two-pass algorithm for processing partial symbols has a
17016 high cost in cache pressure. Thus, handle some simple cases
17017 here which cover the majority of C partial symbols. DIEs
17018 which neither have specification tags in them, nor could have
17019 specification tags elsewhere pointing at them, can simply be
17020 processed and discarded.
17022 This segment is also optional; scan_partial_symbols and
17023 add_partial_symbol will handle these DIEs if we chain
17024 them in normally. When compilers which do not emit large
17025 quantities of duplicate debug information are more common,
17026 this code can probably be removed. */
17028 /* Any complete simple types at the top level (pretty much all
17029 of them, for a language without namespaces), can be processed
17031 if (parent_die == NULL
17032 && part_die->has_specification == 0
17033 && part_die->is_declaration == 0
17034 && ((part_die->tag == DW_TAG_typedef && !part_die->has_children)
17035 || part_die->tag == DW_TAG_base_type
17036 || part_die->tag == DW_TAG_subrange_type))
17038 if (building_psymtab && part_die->name != NULL)
17039 add_psymbol_to_list (part_die->name, strlen (part_die->name), 0,
17040 VAR_DOMAIN, LOC_TYPEDEF,
17041 &objfile->static_psymbols,
17042 0, cu->language, objfile);
17043 info_ptr = locate_pdi_sibling (reader, part_die, info_ptr);
17047 /* The exception for DW_TAG_typedef with has_children above is
17048 a workaround of GCC PR debug/47510. In the case of this complaint
17049 type_name_no_tag_or_error will error on such types later.
17051 GDB skipped children of DW_TAG_typedef by the shortcut above and then
17052 it could not find the child DIEs referenced later, this is checked
17053 above. In correct DWARF DW_TAG_typedef should have no children. */
17055 if (part_die->tag == DW_TAG_typedef && part_die->has_children)
17056 complaint (&symfile_complaints,
17057 _("DW_TAG_typedef has childen - GCC PR debug/47510 bug "
17058 "- DIE at 0x%x [in module %s]"),
17059 to_underlying (part_die->sect_off), objfile_name (objfile));
17061 /* If we're at the second level, and we're an enumerator, and
17062 our parent has no specification (meaning possibly lives in a
17063 namespace elsewhere), then we can add the partial symbol now
17064 instead of queueing it. */
17065 if (part_die->tag == DW_TAG_enumerator
17066 && parent_die != NULL
17067 && parent_die->die_parent == NULL
17068 && parent_die->tag == DW_TAG_enumeration_type
17069 && parent_die->has_specification == 0)
17071 if (part_die->name == NULL)
17072 complaint (&symfile_complaints,
17073 _("malformed enumerator DIE ignored"));
17074 else if (building_psymtab)
17075 add_psymbol_to_list (part_die->name, strlen (part_die->name), 0,
17076 VAR_DOMAIN, LOC_CONST,
17077 cu->language == language_cplus
17078 ? &objfile->global_psymbols
17079 : &objfile->static_psymbols,
17080 0, cu->language, objfile);
17082 info_ptr = locate_pdi_sibling (reader, part_die, info_ptr);
17086 /* We'll save this DIE so link it in. */
17087 part_die->die_parent = parent_die;
17088 part_die->die_sibling = NULL;
17089 part_die->die_child = NULL;
17091 if (last_die && last_die == parent_die)
17092 last_die->die_child = part_die;
17094 last_die->die_sibling = part_die;
17096 last_die = part_die;
17098 if (first_die == NULL)
17099 first_die = part_die;
17101 /* Maybe add the DIE to the hash table. Not all DIEs that we
17102 find interesting need to be in the hash table, because we
17103 also have the parent/sibling/child chains; only those that we
17104 might refer to by offset later during partial symbol reading.
17106 For now this means things that might have be the target of a
17107 DW_AT_specification, DW_AT_abstract_origin, or
17108 DW_AT_extension. DW_AT_extension will refer only to
17109 namespaces; DW_AT_abstract_origin refers to functions (and
17110 many things under the function DIE, but we do not recurse
17111 into function DIEs during partial symbol reading) and
17112 possibly variables as well; DW_AT_specification refers to
17113 declarations. Declarations ought to have the DW_AT_declaration
17114 flag. It happens that GCC forgets to put it in sometimes, but
17115 only for functions, not for types.
17117 Adding more things than necessary to the hash table is harmless
17118 except for the performance cost. Adding too few will result in
17119 wasted time in find_partial_die, when we reread the compilation
17120 unit with load_all_dies set. */
17123 || abbrev->tag == DW_TAG_constant
17124 || abbrev->tag == DW_TAG_subprogram
17125 || abbrev->tag == DW_TAG_variable
17126 || abbrev->tag == DW_TAG_namespace
17127 || part_die->is_declaration)
17131 slot = htab_find_slot_with_hash (cu->partial_dies, part_die,
17132 to_underlying (part_die->sect_off),
17137 part_die = XOBNEW (&cu->comp_unit_obstack, struct partial_die_info);
17139 /* For some DIEs we want to follow their children (if any). For C
17140 we have no reason to follow the children of structures; for other
17141 languages we have to, so that we can get at method physnames
17142 to infer fully qualified class names, for DW_AT_specification,
17143 and for C++ template arguments. For C++, we also look one level
17144 inside functions to find template arguments (if the name of the
17145 function does not already contain the template arguments).
17147 For Ada, we need to scan the children of subprograms and lexical
17148 blocks as well because Ada allows the definition of nested
17149 entities that could be interesting for the debugger, such as
17150 nested subprograms for instance. */
17151 if (last_die->has_children
17153 || last_die->tag == DW_TAG_namespace
17154 || last_die->tag == DW_TAG_module
17155 || last_die->tag == DW_TAG_enumeration_type
17156 || (cu->language == language_cplus
17157 && last_die->tag == DW_TAG_subprogram
17158 && (last_die->name == NULL
17159 || strchr (last_die->name, '<') == NULL))
17160 || (cu->language != language_c
17161 && (last_die->tag == DW_TAG_class_type
17162 || last_die->tag == DW_TAG_interface_type
17163 || last_die->tag == DW_TAG_structure_type
17164 || last_die->tag == DW_TAG_union_type))
17165 || (cu->language == language_ada
17166 && (last_die->tag == DW_TAG_subprogram
17167 || last_die->tag == DW_TAG_lexical_block))))
17170 parent_die = last_die;
17174 /* Otherwise we skip to the next sibling, if any. */
17175 info_ptr = locate_pdi_sibling (reader, last_die, info_ptr);
17177 /* Back to the top, do it again. */
17181 /* Read a minimal amount of information into the minimal die structure. */
17183 static const gdb_byte *
17184 read_partial_die (const struct die_reader_specs *reader,
17185 struct partial_die_info *part_die,
17186 struct abbrev_info *abbrev, unsigned int abbrev_len,
17187 const gdb_byte *info_ptr)
17189 struct dwarf2_cu *cu = reader->cu;
17190 struct objfile *objfile = cu->objfile;
17191 const gdb_byte *buffer = reader->buffer;
17193 struct attribute attr;
17194 int has_low_pc_attr = 0;
17195 int has_high_pc_attr = 0;
17196 int high_pc_relative = 0;
17198 memset (part_die, 0, sizeof (struct partial_die_info));
17200 part_die->sect_off = (sect_offset) (info_ptr - buffer);
17202 info_ptr += abbrev_len;
17204 if (abbrev == NULL)
17207 part_die->tag = abbrev->tag;
17208 part_die->has_children = abbrev->has_children;
17210 for (i = 0; i < abbrev->num_attrs; ++i)
17212 info_ptr = read_attribute (reader, &attr, &abbrev->attrs[i], info_ptr);
17214 /* Store the data if it is of an attribute we want to keep in a
17215 partial symbol table. */
17219 switch (part_die->tag)
17221 case DW_TAG_compile_unit:
17222 case DW_TAG_partial_unit:
17223 case DW_TAG_type_unit:
17224 /* Compilation units have a DW_AT_name that is a filename, not
17225 a source language identifier. */
17226 case DW_TAG_enumeration_type:
17227 case DW_TAG_enumerator:
17228 /* These tags always have simple identifiers already; no need
17229 to canonicalize them. */
17230 part_die->name = DW_STRING (&attr);
17234 = dwarf2_canonicalize_name (DW_STRING (&attr), cu,
17235 &objfile->per_bfd->storage_obstack);
17239 case DW_AT_linkage_name:
17240 case DW_AT_MIPS_linkage_name:
17241 /* Note that both forms of linkage name might appear. We
17242 assume they will be the same, and we only store the last
17244 if (cu->language == language_ada)
17245 part_die->name = DW_STRING (&attr);
17246 part_die->linkage_name = DW_STRING (&attr);
17249 has_low_pc_attr = 1;
17250 part_die->lowpc = attr_value_as_address (&attr);
17252 case DW_AT_high_pc:
17253 has_high_pc_attr = 1;
17254 part_die->highpc = attr_value_as_address (&attr);
17255 if (cu->header.version >= 4 && attr_form_is_constant (&attr))
17256 high_pc_relative = 1;
17258 case DW_AT_location:
17259 /* Support the .debug_loc offsets. */
17260 if (attr_form_is_block (&attr))
17262 part_die->d.locdesc = DW_BLOCK (&attr);
17264 else if (attr_form_is_section_offset (&attr))
17266 dwarf2_complex_location_expr_complaint ();
17270 dwarf2_invalid_attrib_class_complaint ("DW_AT_location",
17271 "partial symbol information");
17274 case DW_AT_external:
17275 part_die->is_external = DW_UNSND (&attr);
17277 case DW_AT_declaration:
17278 part_die->is_declaration = DW_UNSND (&attr);
17281 part_die->has_type = 1;
17283 case DW_AT_abstract_origin:
17284 case DW_AT_specification:
17285 case DW_AT_extension:
17286 part_die->has_specification = 1;
17287 part_die->spec_offset = dwarf2_get_ref_die_offset (&attr);
17288 part_die->spec_is_dwz = (attr.form == DW_FORM_GNU_ref_alt
17289 || cu->per_cu->is_dwz);
17291 case DW_AT_sibling:
17292 /* Ignore absolute siblings, they might point outside of
17293 the current compile unit. */
17294 if (attr.form == DW_FORM_ref_addr)
17295 complaint (&symfile_complaints,
17296 _("ignoring absolute DW_AT_sibling"));
17299 sect_offset off = dwarf2_get_ref_die_offset (&attr);
17300 const gdb_byte *sibling_ptr = buffer + to_underlying (off);
17302 if (sibling_ptr < info_ptr)
17303 complaint (&symfile_complaints,
17304 _("DW_AT_sibling points backwards"));
17305 else if (sibling_ptr > reader->buffer_end)
17306 dwarf2_section_buffer_overflow_complaint (reader->die_section);
17308 part_die->sibling = sibling_ptr;
17311 case DW_AT_byte_size:
17312 part_die->has_byte_size = 1;
17314 case DW_AT_const_value:
17315 part_die->has_const_value = 1;
17317 case DW_AT_calling_convention:
17318 /* DWARF doesn't provide a way to identify a program's source-level
17319 entry point. DW_AT_calling_convention attributes are only meant
17320 to describe functions' calling conventions.
17322 However, because it's a necessary piece of information in
17323 Fortran, and before DWARF 4 DW_CC_program was the only
17324 piece of debugging information whose definition refers to
17325 a 'main program' at all, several compilers marked Fortran
17326 main programs with DW_CC_program --- even when those
17327 functions use the standard calling conventions.
17329 Although DWARF now specifies a way to provide this
17330 information, we support this practice for backward
17332 if (DW_UNSND (&attr) == DW_CC_program
17333 && cu->language == language_fortran)
17334 part_die->main_subprogram = 1;
17337 if (DW_UNSND (&attr) == DW_INL_inlined
17338 || DW_UNSND (&attr) == DW_INL_declared_inlined)
17339 part_die->may_be_inlined = 1;
17343 if (part_die->tag == DW_TAG_imported_unit)
17345 part_die->d.sect_off = dwarf2_get_ref_die_offset (&attr);
17346 part_die->is_dwz = (attr.form == DW_FORM_GNU_ref_alt
17347 || cu->per_cu->is_dwz);
17351 case DW_AT_main_subprogram:
17352 part_die->main_subprogram = DW_UNSND (&attr);
17360 if (high_pc_relative)
17361 part_die->highpc += part_die->lowpc;
17363 if (has_low_pc_attr && has_high_pc_attr)
17365 /* When using the GNU linker, .gnu.linkonce. sections are used to
17366 eliminate duplicate copies of functions and vtables and such.
17367 The linker will arbitrarily choose one and discard the others.
17368 The AT_*_pc values for such functions refer to local labels in
17369 these sections. If the section from that file was discarded, the
17370 labels are not in the output, so the relocs get a value of 0.
17371 If this is a discarded function, mark the pc bounds as invalid,
17372 so that GDB will ignore it. */
17373 if (part_die->lowpc == 0 && !dwarf2_per_objfile->has_section_at_zero)
17375 struct gdbarch *gdbarch = get_objfile_arch (objfile);
17377 complaint (&symfile_complaints,
17378 _("DW_AT_low_pc %s is zero "
17379 "for DIE at 0x%x [in module %s]"),
17380 paddress (gdbarch, part_die->lowpc),
17381 to_underlying (part_die->sect_off), objfile_name (objfile));
17383 /* dwarf2_get_pc_bounds has also the strict low < high requirement. */
17384 else if (part_die->lowpc >= part_die->highpc)
17386 struct gdbarch *gdbarch = get_objfile_arch (objfile);
17388 complaint (&symfile_complaints,
17389 _("DW_AT_low_pc %s is not < DW_AT_high_pc %s "
17390 "for DIE at 0x%x [in module %s]"),
17391 paddress (gdbarch, part_die->lowpc),
17392 paddress (gdbarch, part_die->highpc),
17393 to_underlying (part_die->sect_off),
17394 objfile_name (objfile));
17397 part_die->has_pc_info = 1;
17403 /* Find a cached partial DIE at OFFSET in CU. */
17405 static struct partial_die_info *
17406 find_partial_die_in_comp_unit (sect_offset sect_off, struct dwarf2_cu *cu)
17408 struct partial_die_info *lookup_die = NULL;
17409 struct partial_die_info part_die;
17411 part_die.sect_off = sect_off;
17412 lookup_die = ((struct partial_die_info *)
17413 htab_find_with_hash (cu->partial_dies, &part_die,
17414 to_underlying (sect_off)));
17419 /* Find a partial DIE at OFFSET, which may or may not be in CU,
17420 except in the case of .debug_types DIEs which do not reference
17421 outside their CU (they do however referencing other types via
17422 DW_FORM_ref_sig8). */
17424 static struct partial_die_info *
17425 find_partial_die (sect_offset sect_off, int offset_in_dwz, struct dwarf2_cu *cu)
17427 struct objfile *objfile = cu->objfile;
17428 struct dwarf2_per_cu_data *per_cu = NULL;
17429 struct partial_die_info *pd = NULL;
17431 if (offset_in_dwz == cu->per_cu->is_dwz
17432 && offset_in_cu_p (&cu->header, sect_off))
17434 pd = find_partial_die_in_comp_unit (sect_off, cu);
17437 /* We missed recording what we needed.
17438 Load all dies and try again. */
17439 per_cu = cu->per_cu;
17443 /* TUs don't reference other CUs/TUs (except via type signatures). */
17444 if (cu->per_cu->is_debug_types)
17446 error (_("Dwarf Error: Type Unit at offset 0x%x contains"
17447 " external reference to offset 0x%x [in module %s].\n"),
17448 to_underlying (cu->header.sect_off), to_underlying (sect_off),
17449 bfd_get_filename (objfile->obfd));
17451 per_cu = dwarf2_find_containing_comp_unit (sect_off, offset_in_dwz,
17454 if (per_cu->cu == NULL || per_cu->cu->partial_dies == NULL)
17455 load_partial_comp_unit (per_cu);
17457 per_cu->cu->last_used = 0;
17458 pd = find_partial_die_in_comp_unit (sect_off, per_cu->cu);
17461 /* If we didn't find it, and not all dies have been loaded,
17462 load them all and try again. */
17464 if (pd == NULL && per_cu->load_all_dies == 0)
17466 per_cu->load_all_dies = 1;
17468 /* This is nasty. When we reread the DIEs, somewhere up the call chain
17469 THIS_CU->cu may already be in use. So we can't just free it and
17470 replace its DIEs with the ones we read in. Instead, we leave those
17471 DIEs alone (which can still be in use, e.g. in scan_partial_symbols),
17472 and clobber THIS_CU->cu->partial_dies with the hash table for the new
17474 load_partial_comp_unit (per_cu);
17476 pd = find_partial_die_in_comp_unit (sect_off, per_cu->cu);
17480 internal_error (__FILE__, __LINE__,
17481 _("could not find partial DIE 0x%x "
17482 "in cache [from module %s]\n"),
17483 to_underlying (sect_off), bfd_get_filename (objfile->obfd));
17487 /* See if we can figure out if the class lives in a namespace. We do
17488 this by looking for a member function; its demangled name will
17489 contain namespace info, if there is any. */
17492 guess_partial_die_structure_name (struct partial_die_info *struct_pdi,
17493 struct dwarf2_cu *cu)
17495 /* NOTE: carlton/2003-10-07: Getting the info this way changes
17496 what template types look like, because the demangler
17497 frequently doesn't give the same name as the debug info. We
17498 could fix this by only using the demangled name to get the
17499 prefix (but see comment in read_structure_type). */
17501 struct partial_die_info *real_pdi;
17502 struct partial_die_info *child_pdi;
17504 /* If this DIE (this DIE's specification, if any) has a parent, then
17505 we should not do this. We'll prepend the parent's fully qualified
17506 name when we create the partial symbol. */
17508 real_pdi = struct_pdi;
17509 while (real_pdi->has_specification)
17510 real_pdi = find_partial_die (real_pdi->spec_offset,
17511 real_pdi->spec_is_dwz, cu);
17513 if (real_pdi->die_parent != NULL)
17516 for (child_pdi = struct_pdi->die_child;
17518 child_pdi = child_pdi->die_sibling)
17520 if (child_pdi->tag == DW_TAG_subprogram
17521 && child_pdi->linkage_name != NULL)
17523 char *actual_class_name
17524 = language_class_name_from_physname (cu->language_defn,
17525 child_pdi->linkage_name);
17526 if (actual_class_name != NULL)
17530 obstack_copy0 (&cu->objfile->per_bfd->storage_obstack,
17532 strlen (actual_class_name)));
17533 xfree (actual_class_name);
17540 /* Adjust PART_DIE before generating a symbol for it. This function
17541 may set the is_external flag or change the DIE's name. */
17544 fixup_partial_die (struct partial_die_info *part_die,
17545 struct dwarf2_cu *cu)
17547 /* Once we've fixed up a die, there's no point in doing so again.
17548 This also avoids a memory leak if we were to call
17549 guess_partial_die_structure_name multiple times. */
17550 if (part_die->fixup_called)
17553 /* If we found a reference attribute and the DIE has no name, try
17554 to find a name in the referred to DIE. */
17556 if (part_die->name == NULL && part_die->has_specification)
17558 struct partial_die_info *spec_die;
17560 spec_die = find_partial_die (part_die->spec_offset,
17561 part_die->spec_is_dwz, cu);
17563 fixup_partial_die (spec_die, cu);
17565 if (spec_die->name)
17567 part_die->name = spec_die->name;
17569 /* Copy DW_AT_external attribute if it is set. */
17570 if (spec_die->is_external)
17571 part_die->is_external = spec_die->is_external;
17575 /* Set default names for some unnamed DIEs. */
17577 if (part_die->name == NULL && part_die->tag == DW_TAG_namespace)
17578 part_die->name = CP_ANONYMOUS_NAMESPACE_STR;
17580 /* If there is no parent die to provide a namespace, and there are
17581 children, see if we can determine the namespace from their linkage
17583 if (cu->language == language_cplus
17584 && !VEC_empty (dwarf2_section_info_def, dwarf2_per_objfile->types)
17585 && part_die->die_parent == NULL
17586 && part_die->has_children
17587 && (part_die->tag == DW_TAG_class_type
17588 || part_die->tag == DW_TAG_structure_type
17589 || part_die->tag == DW_TAG_union_type))
17590 guess_partial_die_structure_name (part_die, cu);
17592 /* GCC might emit a nameless struct or union that has a linkage
17593 name. See http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47510. */
17594 if (part_die->name == NULL
17595 && (part_die->tag == DW_TAG_class_type
17596 || part_die->tag == DW_TAG_interface_type
17597 || part_die->tag == DW_TAG_structure_type
17598 || part_die->tag == DW_TAG_union_type)
17599 && part_die->linkage_name != NULL)
17603 demangled = gdb_demangle (part_die->linkage_name, DMGL_TYPES);
17608 /* Strip any leading namespaces/classes, keep only the base name.
17609 DW_AT_name for named DIEs does not contain the prefixes. */
17610 base = strrchr (demangled, ':');
17611 if (base && base > demangled && base[-1] == ':')
17618 obstack_copy0 (&cu->objfile->per_bfd->storage_obstack,
17619 base, strlen (base)));
17624 part_die->fixup_called = 1;
17627 /* Read an attribute value described by an attribute form. */
17629 static const gdb_byte *
17630 read_attribute_value (const struct die_reader_specs *reader,
17631 struct attribute *attr, unsigned form,
17632 LONGEST implicit_const, const gdb_byte *info_ptr)
17634 struct dwarf2_cu *cu = reader->cu;
17635 struct objfile *objfile = cu->objfile;
17636 struct gdbarch *gdbarch = get_objfile_arch (objfile);
17637 bfd *abfd = reader->abfd;
17638 struct comp_unit_head *cu_header = &cu->header;
17639 unsigned int bytes_read;
17640 struct dwarf_block *blk;
17642 attr->form = (enum dwarf_form) form;
17645 case DW_FORM_ref_addr:
17646 if (cu->header.version == 2)
17647 DW_UNSND (attr) = read_address (abfd, info_ptr, cu, &bytes_read);
17649 DW_UNSND (attr) = read_offset (abfd, info_ptr,
17650 &cu->header, &bytes_read);
17651 info_ptr += bytes_read;
17653 case DW_FORM_GNU_ref_alt:
17654 DW_UNSND (attr) = read_offset (abfd, info_ptr, &cu->header, &bytes_read);
17655 info_ptr += bytes_read;
17658 DW_ADDR (attr) = read_address (abfd, info_ptr, cu, &bytes_read);
17659 DW_ADDR (attr) = gdbarch_adjust_dwarf2_addr (gdbarch, DW_ADDR (attr));
17660 info_ptr += bytes_read;
17662 case DW_FORM_block2:
17663 blk = dwarf_alloc_block (cu);
17664 blk->size = read_2_bytes (abfd, info_ptr);
17666 blk->data = read_n_bytes (abfd, info_ptr, blk->size);
17667 info_ptr += blk->size;
17668 DW_BLOCK (attr) = blk;
17670 case DW_FORM_block4:
17671 blk = dwarf_alloc_block (cu);
17672 blk->size = read_4_bytes (abfd, info_ptr);
17674 blk->data = read_n_bytes (abfd, info_ptr, blk->size);
17675 info_ptr += blk->size;
17676 DW_BLOCK (attr) = blk;
17678 case DW_FORM_data2:
17679 DW_UNSND (attr) = read_2_bytes (abfd, info_ptr);
17682 case DW_FORM_data4:
17683 DW_UNSND (attr) = read_4_bytes (abfd, info_ptr);
17686 case DW_FORM_data8:
17687 DW_UNSND (attr) = read_8_bytes (abfd, info_ptr);
17690 case DW_FORM_data16:
17691 blk = dwarf_alloc_block (cu);
17693 blk->data = read_n_bytes (abfd, info_ptr, 16);
17695 DW_BLOCK (attr) = blk;
17697 case DW_FORM_sec_offset:
17698 DW_UNSND (attr) = read_offset (abfd, info_ptr, &cu->header, &bytes_read);
17699 info_ptr += bytes_read;
17701 case DW_FORM_string:
17702 DW_STRING (attr) = read_direct_string (abfd, info_ptr, &bytes_read);
17703 DW_STRING_IS_CANONICAL (attr) = 0;
17704 info_ptr += bytes_read;
17707 if (!cu->per_cu->is_dwz)
17709 DW_STRING (attr) = read_indirect_string (abfd, info_ptr, cu_header,
17711 DW_STRING_IS_CANONICAL (attr) = 0;
17712 info_ptr += bytes_read;
17716 case DW_FORM_line_strp:
17717 if (!cu->per_cu->is_dwz)
17719 DW_STRING (attr) = read_indirect_line_string (abfd, info_ptr,
17720 cu_header, &bytes_read);
17721 DW_STRING_IS_CANONICAL (attr) = 0;
17722 info_ptr += bytes_read;
17726 case DW_FORM_GNU_strp_alt:
17728 struct dwz_file *dwz = dwarf2_get_dwz_file ();
17729 LONGEST str_offset = read_offset (abfd, info_ptr, cu_header,
17732 DW_STRING (attr) = read_indirect_string_from_dwz (dwz, str_offset);
17733 DW_STRING_IS_CANONICAL (attr) = 0;
17734 info_ptr += bytes_read;
17737 case DW_FORM_exprloc:
17738 case DW_FORM_block:
17739 blk = dwarf_alloc_block (cu);
17740 blk->size = read_unsigned_leb128 (abfd, info_ptr, &bytes_read);
17741 info_ptr += bytes_read;
17742 blk->data = read_n_bytes (abfd, info_ptr, blk->size);
17743 info_ptr += blk->size;
17744 DW_BLOCK (attr) = blk;
17746 case DW_FORM_block1:
17747 blk = dwarf_alloc_block (cu);
17748 blk->size = read_1_byte (abfd, info_ptr);
17750 blk->data = read_n_bytes (abfd, info_ptr, blk->size);
17751 info_ptr += blk->size;
17752 DW_BLOCK (attr) = blk;
17754 case DW_FORM_data1:
17755 DW_UNSND (attr) = read_1_byte (abfd, info_ptr);
17759 DW_UNSND (attr) = read_1_byte (abfd, info_ptr);
17762 case DW_FORM_flag_present:
17763 DW_UNSND (attr) = 1;
17765 case DW_FORM_sdata:
17766 DW_SND (attr) = read_signed_leb128 (abfd, info_ptr, &bytes_read);
17767 info_ptr += bytes_read;
17769 case DW_FORM_udata:
17770 DW_UNSND (attr) = read_unsigned_leb128 (abfd, info_ptr, &bytes_read);
17771 info_ptr += bytes_read;
17774 DW_UNSND (attr) = (to_underlying (cu->header.sect_off)
17775 + read_1_byte (abfd, info_ptr));
17779 DW_UNSND (attr) = (to_underlying (cu->header.sect_off)
17780 + read_2_bytes (abfd, info_ptr));
17784 DW_UNSND (attr) = (to_underlying (cu->header.sect_off)
17785 + read_4_bytes (abfd, info_ptr));
17789 DW_UNSND (attr) = (to_underlying (cu->header.sect_off)
17790 + read_8_bytes (abfd, info_ptr));
17793 case DW_FORM_ref_sig8:
17794 DW_SIGNATURE (attr) = read_8_bytes (abfd, info_ptr);
17797 case DW_FORM_ref_udata:
17798 DW_UNSND (attr) = (to_underlying (cu->header.sect_off)
17799 + read_unsigned_leb128 (abfd, info_ptr, &bytes_read));
17800 info_ptr += bytes_read;
17802 case DW_FORM_indirect:
17803 form = read_unsigned_leb128 (abfd, info_ptr, &bytes_read);
17804 info_ptr += bytes_read;
17805 if (form == DW_FORM_implicit_const)
17807 implicit_const = read_signed_leb128 (abfd, info_ptr, &bytes_read);
17808 info_ptr += bytes_read;
17810 info_ptr = read_attribute_value (reader, attr, form, implicit_const,
17813 case DW_FORM_implicit_const:
17814 DW_SND (attr) = implicit_const;
17816 case DW_FORM_GNU_addr_index:
17817 if (reader->dwo_file == NULL)
17819 /* For now flag a hard error.
17820 Later we can turn this into a complaint. */
17821 error (_("Dwarf Error: %s found in non-DWO CU [in module %s]"),
17822 dwarf_form_name (form),
17823 bfd_get_filename (abfd));
17825 DW_ADDR (attr) = read_addr_index_from_leb128 (cu, info_ptr, &bytes_read);
17826 info_ptr += bytes_read;
17828 case DW_FORM_GNU_str_index:
17829 if (reader->dwo_file == NULL)
17831 /* For now flag a hard error.
17832 Later we can turn this into a complaint if warranted. */
17833 error (_("Dwarf Error: %s found in non-DWO CU [in module %s]"),
17834 dwarf_form_name (form),
17835 bfd_get_filename (abfd));
17838 ULONGEST str_index =
17839 read_unsigned_leb128 (abfd, info_ptr, &bytes_read);
17841 DW_STRING (attr) = read_str_index (reader, str_index);
17842 DW_STRING_IS_CANONICAL (attr) = 0;
17843 info_ptr += bytes_read;
17847 error (_("Dwarf Error: Cannot handle %s in DWARF reader [in module %s]"),
17848 dwarf_form_name (form),
17849 bfd_get_filename (abfd));
17853 if (cu->per_cu->is_dwz && attr_form_is_ref (attr))
17854 attr->form = DW_FORM_GNU_ref_alt;
17856 /* We have seen instances where the compiler tried to emit a byte
17857 size attribute of -1 which ended up being encoded as an unsigned
17858 0xffffffff. Although 0xffffffff is technically a valid size value,
17859 an object of this size seems pretty unlikely so we can relatively
17860 safely treat these cases as if the size attribute was invalid and
17861 treat them as zero by default. */
17862 if (attr->name == DW_AT_byte_size
17863 && form == DW_FORM_data4
17864 && DW_UNSND (attr) >= 0xffffffff)
17867 (&symfile_complaints,
17868 _("Suspicious DW_AT_byte_size value treated as zero instead of %s"),
17869 hex_string (DW_UNSND (attr)));
17870 DW_UNSND (attr) = 0;
17876 /* Read an attribute described by an abbreviated attribute. */
17878 static const gdb_byte *
17879 read_attribute (const struct die_reader_specs *reader,
17880 struct attribute *attr, struct attr_abbrev *abbrev,
17881 const gdb_byte *info_ptr)
17883 attr->name = abbrev->name;
17884 return read_attribute_value (reader, attr, abbrev->form,
17885 abbrev->implicit_const, info_ptr);
17888 /* Read dwarf information from a buffer. */
17890 static unsigned int
17891 read_1_byte (bfd *abfd, const gdb_byte *buf)
17893 return bfd_get_8 (abfd, buf);
17897 read_1_signed_byte (bfd *abfd, const gdb_byte *buf)
17899 return bfd_get_signed_8 (abfd, buf);
17902 static unsigned int
17903 read_2_bytes (bfd *abfd, const gdb_byte *buf)
17905 return bfd_get_16 (abfd, buf);
17909 read_2_signed_bytes (bfd *abfd, const gdb_byte *buf)
17911 return bfd_get_signed_16 (abfd, buf);
17914 static unsigned int
17915 read_4_bytes (bfd *abfd, const gdb_byte *buf)
17917 return bfd_get_32 (abfd, buf);
17921 read_4_signed_bytes (bfd *abfd, const gdb_byte *buf)
17923 return bfd_get_signed_32 (abfd, buf);
17927 read_8_bytes (bfd *abfd, const gdb_byte *buf)
17929 return bfd_get_64 (abfd, buf);
17933 read_address (bfd *abfd, const gdb_byte *buf, struct dwarf2_cu *cu,
17934 unsigned int *bytes_read)
17936 struct comp_unit_head *cu_header = &cu->header;
17937 CORE_ADDR retval = 0;
17939 if (cu_header->signed_addr_p)
17941 switch (cu_header->addr_size)
17944 retval = bfd_get_signed_16 (abfd, buf);
17947 retval = bfd_get_signed_32 (abfd, buf);
17950 retval = bfd_get_signed_64 (abfd, buf);
17953 internal_error (__FILE__, __LINE__,
17954 _("read_address: bad switch, signed [in module %s]"),
17955 bfd_get_filename (abfd));
17960 switch (cu_header->addr_size)
17963 retval = bfd_get_16 (abfd, buf);
17966 retval = bfd_get_32 (abfd, buf);
17969 retval = bfd_get_64 (abfd, buf);
17972 internal_error (__FILE__, __LINE__,
17973 _("read_address: bad switch, "
17974 "unsigned [in module %s]"),
17975 bfd_get_filename (abfd));
17979 *bytes_read = cu_header->addr_size;
17983 /* Read the initial length from a section. The (draft) DWARF 3
17984 specification allows the initial length to take up either 4 bytes
17985 or 12 bytes. If the first 4 bytes are 0xffffffff, then the next 8
17986 bytes describe the length and all offsets will be 8 bytes in length
17989 An older, non-standard 64-bit format is also handled by this
17990 function. The older format in question stores the initial length
17991 as an 8-byte quantity without an escape value. Lengths greater
17992 than 2^32 aren't very common which means that the initial 4 bytes
17993 is almost always zero. Since a length value of zero doesn't make
17994 sense for the 32-bit format, this initial zero can be considered to
17995 be an escape value which indicates the presence of the older 64-bit
17996 format. As written, the code can't detect (old format) lengths
17997 greater than 4GB. If it becomes necessary to handle lengths
17998 somewhat larger than 4GB, we could allow other small values (such
17999 as the non-sensical values of 1, 2, and 3) to also be used as
18000 escape values indicating the presence of the old format.
18002 The value returned via bytes_read should be used to increment the
18003 relevant pointer after calling read_initial_length().
18005 [ Note: read_initial_length() and read_offset() are based on the
18006 document entitled "DWARF Debugging Information Format", revision
18007 3, draft 8, dated November 19, 2001. This document was obtained
18010 http://reality.sgiweb.org/davea/dwarf3-draft8-011125.pdf
18012 This document is only a draft and is subject to change. (So beware.)
18014 Details regarding the older, non-standard 64-bit format were
18015 determined empirically by examining 64-bit ELF files produced by
18016 the SGI toolchain on an IRIX 6.5 machine.
18018 - Kevin, July 16, 2002
18022 read_initial_length (bfd *abfd, const gdb_byte *buf, unsigned int *bytes_read)
18024 LONGEST length = bfd_get_32 (abfd, buf);
18026 if (length == 0xffffffff)
18028 length = bfd_get_64 (abfd, buf + 4);
18031 else if (length == 0)
18033 /* Handle the (non-standard) 64-bit DWARF2 format used by IRIX. */
18034 length = bfd_get_64 (abfd, buf);
18045 /* Cover function for read_initial_length.
18046 Returns the length of the object at BUF, and stores the size of the
18047 initial length in *BYTES_READ and stores the size that offsets will be in
18049 If the initial length size is not equivalent to that specified in
18050 CU_HEADER then issue a complaint.
18051 This is useful when reading non-comp-unit headers. */
18054 read_checked_initial_length_and_offset (bfd *abfd, const gdb_byte *buf,
18055 const struct comp_unit_head *cu_header,
18056 unsigned int *bytes_read,
18057 unsigned int *offset_size)
18059 LONGEST length = read_initial_length (abfd, buf, bytes_read);
18061 gdb_assert (cu_header->initial_length_size == 4
18062 || cu_header->initial_length_size == 8
18063 || cu_header->initial_length_size == 12);
18065 if (cu_header->initial_length_size != *bytes_read)
18066 complaint (&symfile_complaints,
18067 _("intermixed 32-bit and 64-bit DWARF sections"));
18069 *offset_size = (*bytes_read == 4) ? 4 : 8;
18073 /* Read an offset from the data stream. The size of the offset is
18074 given by cu_header->offset_size. */
18077 read_offset (bfd *abfd, const gdb_byte *buf,
18078 const struct comp_unit_head *cu_header,
18079 unsigned int *bytes_read)
18081 LONGEST offset = read_offset_1 (abfd, buf, cu_header->offset_size);
18083 *bytes_read = cu_header->offset_size;
18087 /* Read an offset from the data stream. */
18090 read_offset_1 (bfd *abfd, const gdb_byte *buf, unsigned int offset_size)
18092 LONGEST retval = 0;
18094 switch (offset_size)
18097 retval = bfd_get_32 (abfd, buf);
18100 retval = bfd_get_64 (abfd, buf);
18103 internal_error (__FILE__, __LINE__,
18104 _("read_offset_1: bad switch [in module %s]"),
18105 bfd_get_filename (abfd));
18111 static const gdb_byte *
18112 read_n_bytes (bfd *abfd, const gdb_byte *buf, unsigned int size)
18114 /* If the size of a host char is 8 bits, we can return a pointer
18115 to the buffer, otherwise we have to copy the data to a buffer
18116 allocated on the temporary obstack. */
18117 gdb_assert (HOST_CHAR_BIT == 8);
18121 static const char *
18122 read_direct_string (bfd *abfd, const gdb_byte *buf,
18123 unsigned int *bytes_read_ptr)
18125 /* If the size of a host char is 8 bits, we can return a pointer
18126 to the string, otherwise we have to copy the string to a buffer
18127 allocated on the temporary obstack. */
18128 gdb_assert (HOST_CHAR_BIT == 8);
18131 *bytes_read_ptr = 1;
18134 *bytes_read_ptr = strlen ((const char *) buf) + 1;
18135 return (const char *) buf;
18138 /* Return pointer to string at section SECT offset STR_OFFSET with error
18139 reporting strings FORM_NAME and SECT_NAME. */
18141 static const char *
18142 read_indirect_string_at_offset_from (bfd *abfd, LONGEST str_offset,
18143 struct dwarf2_section_info *sect,
18144 const char *form_name,
18145 const char *sect_name)
18147 dwarf2_read_section (dwarf2_per_objfile->objfile, sect);
18148 if (sect->buffer == NULL)
18149 error (_("%s used without %s section [in module %s]"),
18150 form_name, sect_name, bfd_get_filename (abfd));
18151 if (str_offset >= sect->size)
18152 error (_("%s pointing outside of %s section [in module %s]"),
18153 form_name, sect_name, bfd_get_filename (abfd));
18154 gdb_assert (HOST_CHAR_BIT == 8);
18155 if (sect->buffer[str_offset] == '\0')
18157 return (const char *) (sect->buffer + str_offset);
18160 /* Return pointer to string at .debug_str offset STR_OFFSET. */
18162 static const char *
18163 read_indirect_string_at_offset (bfd *abfd, LONGEST str_offset)
18165 return read_indirect_string_at_offset_from (abfd, str_offset,
18166 &dwarf2_per_objfile->str,
18167 "DW_FORM_strp", ".debug_str");
18170 /* Return pointer to string at .debug_line_str offset STR_OFFSET. */
18172 static const char *
18173 read_indirect_line_string_at_offset (bfd *abfd, LONGEST str_offset)
18175 return read_indirect_string_at_offset_from (abfd, str_offset,
18176 &dwarf2_per_objfile->line_str,
18177 "DW_FORM_line_strp",
18178 ".debug_line_str");
18181 /* Read a string at offset STR_OFFSET in the .debug_str section from
18182 the .dwz file DWZ. Throw an error if the offset is too large. If
18183 the string consists of a single NUL byte, return NULL; otherwise
18184 return a pointer to the string. */
18186 static const char *
18187 read_indirect_string_from_dwz (struct dwz_file *dwz, LONGEST str_offset)
18189 dwarf2_read_section (dwarf2_per_objfile->objfile, &dwz->str);
18191 if (dwz->str.buffer == NULL)
18192 error (_("DW_FORM_GNU_strp_alt used without .debug_str "
18193 "section [in module %s]"),
18194 bfd_get_filename (dwz->dwz_bfd));
18195 if (str_offset >= dwz->str.size)
18196 error (_("DW_FORM_GNU_strp_alt pointing outside of "
18197 ".debug_str section [in module %s]"),
18198 bfd_get_filename (dwz->dwz_bfd));
18199 gdb_assert (HOST_CHAR_BIT == 8);
18200 if (dwz->str.buffer[str_offset] == '\0')
18202 return (const char *) (dwz->str.buffer + str_offset);
18205 /* Return pointer to string at .debug_str offset as read from BUF.
18206 BUF is assumed to be in a compilation unit described by CU_HEADER.
18207 Return *BYTES_READ_PTR count of bytes read from BUF. */
18209 static const char *
18210 read_indirect_string (bfd *abfd, const gdb_byte *buf,
18211 const struct comp_unit_head *cu_header,
18212 unsigned int *bytes_read_ptr)
18214 LONGEST str_offset = read_offset (abfd, buf, cu_header, bytes_read_ptr);
18216 return read_indirect_string_at_offset (abfd, str_offset);
18219 /* Return pointer to string at .debug_line_str offset as read from BUF.
18220 BUF is assumed to be in a compilation unit described by CU_HEADER.
18221 Return *BYTES_READ_PTR count of bytes read from BUF. */
18223 static const char *
18224 read_indirect_line_string (bfd *abfd, const gdb_byte *buf,
18225 const struct comp_unit_head *cu_header,
18226 unsigned int *bytes_read_ptr)
18228 LONGEST str_offset = read_offset (abfd, buf, cu_header, bytes_read_ptr);
18230 return read_indirect_line_string_at_offset (abfd, str_offset);
18234 read_unsigned_leb128 (bfd *abfd, const gdb_byte *buf,
18235 unsigned int *bytes_read_ptr)
18238 unsigned int num_read;
18240 unsigned char byte;
18247 byte = bfd_get_8 (abfd, buf);
18250 result |= ((ULONGEST) (byte & 127) << shift);
18251 if ((byte & 128) == 0)
18257 *bytes_read_ptr = num_read;
18262 read_signed_leb128 (bfd *abfd, const gdb_byte *buf,
18263 unsigned int *bytes_read_ptr)
18266 int shift, num_read;
18267 unsigned char byte;
18274 byte = bfd_get_8 (abfd, buf);
18277 result |= ((LONGEST) (byte & 127) << shift);
18279 if ((byte & 128) == 0)
18284 if ((shift < 8 * sizeof (result)) && (byte & 0x40))
18285 result |= -(((LONGEST) 1) << shift);
18286 *bytes_read_ptr = num_read;
18290 /* Given index ADDR_INDEX in .debug_addr, fetch the value.
18291 ADDR_BASE is the DW_AT_GNU_addr_base attribute or zero.
18292 ADDR_SIZE is the size of addresses from the CU header. */
18295 read_addr_index_1 (unsigned int addr_index, ULONGEST addr_base, int addr_size)
18297 struct objfile *objfile = dwarf2_per_objfile->objfile;
18298 bfd *abfd = objfile->obfd;
18299 const gdb_byte *info_ptr;
18301 dwarf2_read_section (objfile, &dwarf2_per_objfile->addr);
18302 if (dwarf2_per_objfile->addr.buffer == NULL)
18303 error (_("DW_FORM_addr_index used without .debug_addr section [in module %s]"),
18304 objfile_name (objfile));
18305 if (addr_base + addr_index * addr_size >= dwarf2_per_objfile->addr.size)
18306 error (_("DW_FORM_addr_index pointing outside of "
18307 ".debug_addr section [in module %s]"),
18308 objfile_name (objfile));
18309 info_ptr = (dwarf2_per_objfile->addr.buffer
18310 + addr_base + addr_index * addr_size);
18311 if (addr_size == 4)
18312 return bfd_get_32 (abfd, info_ptr);
18314 return bfd_get_64 (abfd, info_ptr);
18317 /* Given index ADDR_INDEX in .debug_addr, fetch the value. */
18320 read_addr_index (struct dwarf2_cu *cu, unsigned int addr_index)
18322 return read_addr_index_1 (addr_index, cu->addr_base, cu->header.addr_size);
18325 /* Given a pointer to an leb128 value, fetch the value from .debug_addr. */
18328 read_addr_index_from_leb128 (struct dwarf2_cu *cu, const gdb_byte *info_ptr,
18329 unsigned int *bytes_read)
18331 bfd *abfd = cu->objfile->obfd;
18332 unsigned int addr_index = read_unsigned_leb128 (abfd, info_ptr, bytes_read);
18334 return read_addr_index (cu, addr_index);
18337 /* Data structure to pass results from dwarf2_read_addr_index_reader
18338 back to dwarf2_read_addr_index. */
18340 struct dwarf2_read_addr_index_data
18342 ULONGEST addr_base;
18346 /* die_reader_func for dwarf2_read_addr_index. */
18349 dwarf2_read_addr_index_reader (const struct die_reader_specs *reader,
18350 const gdb_byte *info_ptr,
18351 struct die_info *comp_unit_die,
18355 struct dwarf2_cu *cu = reader->cu;
18356 struct dwarf2_read_addr_index_data *aidata =
18357 (struct dwarf2_read_addr_index_data *) data;
18359 aidata->addr_base = cu->addr_base;
18360 aidata->addr_size = cu->header.addr_size;
18363 /* Given an index in .debug_addr, fetch the value.
18364 NOTE: This can be called during dwarf expression evaluation,
18365 long after the debug information has been read, and thus per_cu->cu
18366 may no longer exist. */
18369 dwarf2_read_addr_index (struct dwarf2_per_cu_data *per_cu,
18370 unsigned int addr_index)
18372 struct objfile *objfile = per_cu->objfile;
18373 struct dwarf2_cu *cu = per_cu->cu;
18374 ULONGEST addr_base;
18377 /* This is intended to be called from outside this file. */
18378 dw2_setup (objfile);
18380 /* We need addr_base and addr_size.
18381 If we don't have PER_CU->cu, we have to get it.
18382 Nasty, but the alternative is storing the needed info in PER_CU,
18383 which at this point doesn't seem justified: it's not clear how frequently
18384 it would get used and it would increase the size of every PER_CU.
18385 Entry points like dwarf2_per_cu_addr_size do a similar thing
18386 so we're not in uncharted territory here.
18387 Alas we need to be a bit more complicated as addr_base is contained
18390 We don't need to read the entire CU(/TU).
18391 We just need the header and top level die.
18393 IWBN to use the aging mechanism to let us lazily later discard the CU.
18394 For now we skip this optimization. */
18398 addr_base = cu->addr_base;
18399 addr_size = cu->header.addr_size;
18403 struct dwarf2_read_addr_index_data aidata;
18405 /* Note: We can't use init_cutu_and_read_dies_simple here,
18406 we need addr_base. */
18407 init_cutu_and_read_dies (per_cu, NULL, 0, 0,
18408 dwarf2_read_addr_index_reader, &aidata);
18409 addr_base = aidata.addr_base;
18410 addr_size = aidata.addr_size;
18413 return read_addr_index_1 (addr_index, addr_base, addr_size);
18416 /* Given a DW_FORM_GNU_str_index, fetch the string.
18417 This is only used by the Fission support. */
18419 static const char *
18420 read_str_index (const struct die_reader_specs *reader, ULONGEST str_index)
18422 struct objfile *objfile = dwarf2_per_objfile->objfile;
18423 const char *objf_name = objfile_name (objfile);
18424 bfd *abfd = objfile->obfd;
18425 struct dwarf2_cu *cu = reader->cu;
18426 struct dwarf2_section_info *str_section = &reader->dwo_file->sections.str;
18427 struct dwarf2_section_info *str_offsets_section =
18428 &reader->dwo_file->sections.str_offsets;
18429 const gdb_byte *info_ptr;
18430 ULONGEST str_offset;
18431 static const char form_name[] = "DW_FORM_GNU_str_index";
18433 dwarf2_read_section (objfile, str_section);
18434 dwarf2_read_section (objfile, str_offsets_section);
18435 if (str_section->buffer == NULL)
18436 error (_("%s used without .debug_str.dwo section"
18437 " in CU at offset 0x%x [in module %s]"),
18438 form_name, to_underlying (cu->header.sect_off), objf_name);
18439 if (str_offsets_section->buffer == NULL)
18440 error (_("%s used without .debug_str_offsets.dwo section"
18441 " in CU at offset 0x%x [in module %s]"),
18442 form_name, to_underlying (cu->header.sect_off), objf_name);
18443 if (str_index * cu->header.offset_size >= str_offsets_section->size)
18444 error (_("%s pointing outside of .debug_str_offsets.dwo"
18445 " section in CU at offset 0x%x [in module %s]"),
18446 form_name, to_underlying (cu->header.sect_off), objf_name);
18447 info_ptr = (str_offsets_section->buffer
18448 + str_index * cu->header.offset_size);
18449 if (cu->header.offset_size == 4)
18450 str_offset = bfd_get_32 (abfd, info_ptr);
18452 str_offset = bfd_get_64 (abfd, info_ptr);
18453 if (str_offset >= str_section->size)
18454 error (_("Offset from %s pointing outside of"
18455 " .debug_str.dwo section in CU at offset 0x%x [in module %s]"),
18456 form_name, to_underlying (cu->header.sect_off), objf_name);
18457 return (const char *) (str_section->buffer + str_offset);
18460 /* Return the length of an LEB128 number in BUF. */
18463 leb128_size (const gdb_byte *buf)
18465 const gdb_byte *begin = buf;
18471 if ((byte & 128) == 0)
18472 return buf - begin;
18477 set_cu_language (unsigned int lang, struct dwarf2_cu *cu)
18486 cu->language = language_c;
18489 case DW_LANG_C_plus_plus:
18490 case DW_LANG_C_plus_plus_11:
18491 case DW_LANG_C_plus_plus_14:
18492 cu->language = language_cplus;
18495 cu->language = language_d;
18497 case DW_LANG_Fortran77:
18498 case DW_LANG_Fortran90:
18499 case DW_LANG_Fortran95:
18500 case DW_LANG_Fortran03:
18501 case DW_LANG_Fortran08:
18502 cu->language = language_fortran;
18505 cu->language = language_go;
18507 case DW_LANG_Mips_Assembler:
18508 cu->language = language_asm;
18510 case DW_LANG_Ada83:
18511 case DW_LANG_Ada95:
18512 cu->language = language_ada;
18514 case DW_LANG_Modula2:
18515 cu->language = language_m2;
18517 case DW_LANG_Pascal83:
18518 cu->language = language_pascal;
18521 cu->language = language_objc;
18524 case DW_LANG_Rust_old:
18525 cu->language = language_rust;
18527 case DW_LANG_Cobol74:
18528 case DW_LANG_Cobol85:
18530 cu->language = language_minimal;
18533 cu->language_defn = language_def (cu->language);
18536 /* Return the named attribute or NULL if not there. */
18538 static struct attribute *
18539 dwarf2_attr (struct die_info *die, unsigned int name, struct dwarf2_cu *cu)
18544 struct attribute *spec = NULL;
18546 for (i = 0; i < die->num_attrs; ++i)
18548 if (die->attrs[i].name == name)
18549 return &die->attrs[i];
18550 if (die->attrs[i].name == DW_AT_specification
18551 || die->attrs[i].name == DW_AT_abstract_origin)
18552 spec = &die->attrs[i];
18558 die = follow_die_ref (die, spec, &cu);
18564 /* Return the named attribute or NULL if not there,
18565 but do not follow DW_AT_specification, etc.
18566 This is for use in contexts where we're reading .debug_types dies.
18567 Following DW_AT_specification, DW_AT_abstract_origin will take us
18568 back up the chain, and we want to go down. */
18570 static struct attribute *
18571 dwarf2_attr_no_follow (struct die_info *die, unsigned int name)
18575 for (i = 0; i < die->num_attrs; ++i)
18576 if (die->attrs[i].name == name)
18577 return &die->attrs[i];
18582 /* Return the string associated with a string-typed attribute, or NULL if it
18583 is either not found or is of an incorrect type. */
18585 static const char *
18586 dwarf2_string_attr (struct die_info *die, unsigned int name, struct dwarf2_cu *cu)
18588 struct attribute *attr;
18589 const char *str = NULL;
18591 attr = dwarf2_attr (die, name, cu);
18595 if (attr->form == DW_FORM_strp || attr->form == DW_FORM_line_strp
18596 || attr->form == DW_FORM_string
18597 || attr->form == DW_FORM_GNU_str_index
18598 || attr->form == DW_FORM_GNU_strp_alt)
18599 str = DW_STRING (attr);
18601 complaint (&symfile_complaints,
18602 _("string type expected for attribute %s for "
18603 "DIE at 0x%x in module %s"),
18604 dwarf_attr_name (name), to_underlying (die->sect_off),
18605 objfile_name (cu->objfile));
18611 /* Return non-zero iff the attribute NAME is defined for the given DIE,
18612 and holds a non-zero value. This function should only be used for
18613 DW_FORM_flag or DW_FORM_flag_present attributes. */
18616 dwarf2_flag_true_p (struct die_info *die, unsigned name, struct dwarf2_cu *cu)
18618 struct attribute *attr = dwarf2_attr (die, name, cu);
18620 return (attr && DW_UNSND (attr));
18624 die_is_declaration (struct die_info *die, struct dwarf2_cu *cu)
18626 /* A DIE is a declaration if it has a DW_AT_declaration attribute
18627 which value is non-zero. However, we have to be careful with
18628 DIEs having a DW_AT_specification attribute, because dwarf2_attr()
18629 (via dwarf2_flag_true_p) follows this attribute. So we may
18630 end up accidently finding a declaration attribute that belongs
18631 to a different DIE referenced by the specification attribute,
18632 even though the given DIE does not have a declaration attribute. */
18633 return (dwarf2_flag_true_p (die, DW_AT_declaration, cu)
18634 && dwarf2_attr (die, DW_AT_specification, cu) == NULL);
18637 /* Return the die giving the specification for DIE, if there is
18638 one. *SPEC_CU is the CU containing DIE on input, and the CU
18639 containing the return value on output. If there is no
18640 specification, but there is an abstract origin, that is
18643 static struct die_info *
18644 die_specification (struct die_info *die, struct dwarf2_cu **spec_cu)
18646 struct attribute *spec_attr = dwarf2_attr (die, DW_AT_specification,
18649 if (spec_attr == NULL)
18650 spec_attr = dwarf2_attr (die, DW_AT_abstract_origin, *spec_cu);
18652 if (spec_attr == NULL)
18655 return follow_die_ref (die, spec_attr, spec_cu);
18658 /* Stub for free_line_header to match void * callback types. */
18661 free_line_header_voidp (void *arg)
18663 struct line_header *lh = (struct line_header *) arg;
18669 line_header::add_include_dir (const char *include_dir)
18671 if (dwarf_line_debug >= 2)
18672 fprintf_unfiltered (gdb_stdlog, "Adding dir %zu: %s\n",
18673 include_dirs.size () + 1, include_dir);
18675 include_dirs.push_back (include_dir);
18679 line_header::add_file_name (const char *name,
18681 unsigned int mod_time,
18682 unsigned int length)
18684 if (dwarf_line_debug >= 2)
18685 fprintf_unfiltered (gdb_stdlog, "Adding file %u: %s\n",
18686 (unsigned) file_names.size () + 1, name);
18688 file_names.emplace_back (name, d_index, mod_time, length);
18691 /* A convenience function to find the proper .debug_line section for a CU. */
18693 static struct dwarf2_section_info *
18694 get_debug_line_section (struct dwarf2_cu *cu)
18696 struct dwarf2_section_info *section;
18698 /* For TUs in DWO files, the DW_AT_stmt_list attribute lives in the
18700 if (cu->dwo_unit && cu->per_cu->is_debug_types)
18701 section = &cu->dwo_unit->dwo_file->sections.line;
18702 else if (cu->per_cu->is_dwz)
18704 struct dwz_file *dwz = dwarf2_get_dwz_file ();
18706 section = &dwz->line;
18709 section = &dwarf2_per_objfile->line;
18714 /* Read directory or file name entry format, starting with byte of
18715 format count entries, ULEB128 pairs of entry formats, ULEB128 of
18716 entries count and the entries themselves in the described entry
18720 read_formatted_entries (bfd *abfd, const gdb_byte **bufp,
18721 struct line_header *lh,
18722 const struct comp_unit_head *cu_header,
18723 void (*callback) (struct line_header *lh,
18726 unsigned int mod_time,
18727 unsigned int length))
18729 gdb_byte format_count, formati;
18730 ULONGEST data_count, datai;
18731 const gdb_byte *buf = *bufp;
18732 const gdb_byte *format_header_data;
18734 unsigned int bytes_read;
18736 format_count = read_1_byte (abfd, buf);
18738 format_header_data = buf;
18739 for (formati = 0; formati < format_count; formati++)
18741 read_unsigned_leb128 (abfd, buf, &bytes_read);
18743 read_unsigned_leb128 (abfd, buf, &bytes_read);
18747 data_count = read_unsigned_leb128 (abfd, buf, &bytes_read);
18749 for (datai = 0; datai < data_count; datai++)
18751 const gdb_byte *format = format_header_data;
18752 struct file_entry fe;
18754 for (formati = 0; formati < format_count; formati++)
18756 ULONGEST content_type = read_unsigned_leb128 (abfd, format, &bytes_read);
18757 format += bytes_read;
18759 ULONGEST form = read_unsigned_leb128 (abfd, format, &bytes_read);
18760 format += bytes_read;
18762 gdb::optional<const char *> string;
18763 gdb::optional<unsigned int> uint;
18767 case DW_FORM_string:
18768 string.emplace (read_direct_string (abfd, buf, &bytes_read));
18772 case DW_FORM_line_strp:
18773 string.emplace (read_indirect_line_string (abfd, buf,
18779 case DW_FORM_data1:
18780 uint.emplace (read_1_byte (abfd, buf));
18784 case DW_FORM_data2:
18785 uint.emplace (read_2_bytes (abfd, buf));
18789 case DW_FORM_data4:
18790 uint.emplace (read_4_bytes (abfd, buf));
18794 case DW_FORM_data8:
18795 uint.emplace (read_8_bytes (abfd, buf));
18799 case DW_FORM_udata:
18800 uint.emplace (read_unsigned_leb128 (abfd, buf, &bytes_read));
18804 case DW_FORM_block:
18805 /* It is valid only for DW_LNCT_timestamp which is ignored by
18810 switch (content_type)
18813 if (string.has_value ())
18816 case DW_LNCT_directory_index:
18817 if (uint.has_value ())
18818 fe.d_index = (dir_index) *uint;
18820 case DW_LNCT_timestamp:
18821 if (uint.has_value ())
18822 fe.mod_time = *uint;
18825 if (uint.has_value ())
18831 complaint (&symfile_complaints,
18832 _("Unknown format content type %s"),
18833 pulongest (content_type));
18837 callback (lh, fe.name, fe.d_index, fe.mod_time, fe.length);
18843 /* Read the statement program header starting at OFFSET in
18844 .debug_line, or .debug_line.dwo. Return a pointer
18845 to a struct line_header, allocated using xmalloc.
18846 Returns NULL if there is a problem reading the header, e.g., if it
18847 has a version we don't understand.
18849 NOTE: the strings in the include directory and file name tables of
18850 the returned object point into the dwarf line section buffer,
18851 and must not be freed. */
18853 static line_header_up
18854 dwarf_decode_line_header (sect_offset sect_off, struct dwarf2_cu *cu)
18856 const gdb_byte *line_ptr;
18857 unsigned int bytes_read, offset_size;
18859 const char *cur_dir, *cur_file;
18860 struct dwarf2_section_info *section;
18863 section = get_debug_line_section (cu);
18864 dwarf2_read_section (dwarf2_per_objfile->objfile, section);
18865 if (section->buffer == NULL)
18867 if (cu->dwo_unit && cu->per_cu->is_debug_types)
18868 complaint (&symfile_complaints, _("missing .debug_line.dwo section"));
18870 complaint (&symfile_complaints, _("missing .debug_line section"));
18874 /* We can't do this until we know the section is non-empty.
18875 Only then do we know we have such a section. */
18876 abfd = get_section_bfd_owner (section);
18878 /* Make sure that at least there's room for the total_length field.
18879 That could be 12 bytes long, but we're just going to fudge that. */
18880 if (to_underlying (sect_off) + 4 >= section->size)
18882 dwarf2_statement_list_fits_in_line_number_section_complaint ();
18886 line_header_up lh (new line_header ());
18888 lh->sect_off = sect_off;
18889 lh->offset_in_dwz = cu->per_cu->is_dwz;
18891 line_ptr = section->buffer + to_underlying (sect_off);
18893 /* Read in the header. */
18895 read_checked_initial_length_and_offset (abfd, line_ptr, &cu->header,
18896 &bytes_read, &offset_size);
18897 line_ptr += bytes_read;
18898 if (line_ptr + lh->total_length > (section->buffer + section->size))
18900 dwarf2_statement_list_fits_in_line_number_section_complaint ();
18903 lh->statement_program_end = line_ptr + lh->total_length;
18904 lh->version = read_2_bytes (abfd, line_ptr);
18906 if (lh->version > 5)
18908 /* This is a version we don't understand. The format could have
18909 changed in ways we don't handle properly so just punt. */
18910 complaint (&symfile_complaints,
18911 _("unsupported version in .debug_line section"));
18914 if (lh->version >= 5)
18916 gdb_byte segment_selector_size;
18918 /* Skip address size. */
18919 read_1_byte (abfd, line_ptr);
18922 segment_selector_size = read_1_byte (abfd, line_ptr);
18924 if (segment_selector_size != 0)
18926 complaint (&symfile_complaints,
18927 _("unsupported segment selector size %u "
18928 "in .debug_line section"),
18929 segment_selector_size);
18933 lh->header_length = read_offset_1 (abfd, line_ptr, offset_size);
18934 line_ptr += offset_size;
18935 lh->minimum_instruction_length = read_1_byte (abfd, line_ptr);
18937 if (lh->version >= 4)
18939 lh->maximum_ops_per_instruction = read_1_byte (abfd, line_ptr);
18943 lh->maximum_ops_per_instruction = 1;
18945 if (lh->maximum_ops_per_instruction == 0)
18947 lh->maximum_ops_per_instruction = 1;
18948 complaint (&symfile_complaints,
18949 _("invalid maximum_ops_per_instruction "
18950 "in `.debug_line' section"));
18953 lh->default_is_stmt = read_1_byte (abfd, line_ptr);
18955 lh->line_base = read_1_signed_byte (abfd, line_ptr);
18957 lh->line_range = read_1_byte (abfd, line_ptr);
18959 lh->opcode_base = read_1_byte (abfd, line_ptr);
18961 lh->standard_opcode_lengths.reset (new unsigned char[lh->opcode_base]);
18963 lh->standard_opcode_lengths[0] = 1; /* This should never be used anyway. */
18964 for (i = 1; i < lh->opcode_base; ++i)
18966 lh->standard_opcode_lengths[i] = read_1_byte (abfd, line_ptr);
18970 if (lh->version >= 5)
18972 /* Read directory table. */
18973 read_formatted_entries (abfd, &line_ptr, lh.get (), &cu->header,
18974 [] (struct line_header *lh, const char *name,
18975 dir_index d_index, unsigned int mod_time,
18976 unsigned int length)
18978 lh->add_include_dir (name);
18981 /* Read file name table. */
18982 read_formatted_entries (abfd, &line_ptr, lh.get (), &cu->header,
18983 [] (struct line_header *lh, const char *name,
18984 dir_index d_index, unsigned int mod_time,
18985 unsigned int length)
18987 lh->add_file_name (name, d_index, mod_time, length);
18992 /* Read directory table. */
18993 while ((cur_dir = read_direct_string (abfd, line_ptr, &bytes_read)) != NULL)
18995 line_ptr += bytes_read;
18996 lh->add_include_dir (cur_dir);
18998 line_ptr += bytes_read;
19000 /* Read file name table. */
19001 while ((cur_file = read_direct_string (abfd, line_ptr, &bytes_read)) != NULL)
19003 unsigned int mod_time, length;
19006 line_ptr += bytes_read;
19007 d_index = (dir_index) read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
19008 line_ptr += bytes_read;
19009 mod_time = read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
19010 line_ptr += bytes_read;
19011 length = read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
19012 line_ptr += bytes_read;
19014 lh->add_file_name (cur_file, d_index, mod_time, length);
19016 line_ptr += bytes_read;
19018 lh->statement_program_start = line_ptr;
19020 if (line_ptr > (section->buffer + section->size))
19021 complaint (&symfile_complaints,
19022 _("line number info header doesn't "
19023 "fit in `.debug_line' section"));
19028 /* Subroutine of dwarf_decode_lines to simplify it.
19029 Return the file name of the psymtab for included file FILE_INDEX
19030 in line header LH of PST.
19031 COMP_DIR is the compilation directory (DW_AT_comp_dir) or NULL if unknown.
19032 If space for the result is malloc'd, it will be freed by a cleanup.
19033 Returns NULL if FILE_INDEX should be ignored, i.e., it is pst->filename.
19035 The function creates dangling cleanup registration. */
19037 static const char *
19038 psymtab_include_file_name (const struct line_header *lh, int file_index,
19039 const struct partial_symtab *pst,
19040 const char *comp_dir)
19042 const file_entry &fe = lh->file_names[file_index];
19043 const char *include_name = fe.name;
19044 const char *include_name_to_compare = include_name;
19045 const char *pst_filename;
19046 char *copied_name = NULL;
19049 const char *dir_name = fe.include_dir (lh);
19051 if (!IS_ABSOLUTE_PATH (include_name)
19052 && (dir_name != NULL || comp_dir != NULL))
19054 /* Avoid creating a duplicate psymtab for PST.
19055 We do this by comparing INCLUDE_NAME and PST_FILENAME.
19056 Before we do the comparison, however, we need to account
19057 for DIR_NAME and COMP_DIR.
19058 First prepend dir_name (if non-NULL). If we still don't
19059 have an absolute path prepend comp_dir (if non-NULL).
19060 However, the directory we record in the include-file's
19061 psymtab does not contain COMP_DIR (to match the
19062 corresponding symtab(s)).
19067 bash$ gcc -g ./hello.c
19068 include_name = "hello.c"
19070 DW_AT_comp_dir = comp_dir = "/tmp"
19071 DW_AT_name = "./hello.c"
19075 if (dir_name != NULL)
19077 char *tem = concat (dir_name, SLASH_STRING,
19078 include_name, (char *)NULL);
19080 make_cleanup (xfree, tem);
19081 include_name = tem;
19082 include_name_to_compare = include_name;
19084 if (!IS_ABSOLUTE_PATH (include_name) && comp_dir != NULL)
19086 char *tem = concat (comp_dir, SLASH_STRING,
19087 include_name, (char *)NULL);
19089 make_cleanup (xfree, tem);
19090 include_name_to_compare = tem;
19094 pst_filename = pst->filename;
19095 if (!IS_ABSOLUTE_PATH (pst_filename) && pst->dirname != NULL)
19097 copied_name = concat (pst->dirname, SLASH_STRING,
19098 pst_filename, (char *)NULL);
19099 pst_filename = copied_name;
19102 file_is_pst = FILENAME_CMP (include_name_to_compare, pst_filename) == 0;
19104 if (copied_name != NULL)
19105 xfree (copied_name);
19109 return include_name;
19112 /* State machine to track the state of the line number program. */
19114 class lnp_state_machine
19117 /* Initialize a machine state for the start of a line number
19119 lnp_state_machine (gdbarch *arch, line_header *lh, bool record_lines_p);
19121 file_entry *current_file ()
19123 /* lh->file_names is 0-based, but the file name numbers in the
19124 statement program are 1-based. */
19125 return m_line_header->file_name_at (m_file);
19128 /* Record the line in the state machine. END_SEQUENCE is true if
19129 we're processing the end of a sequence. */
19130 void record_line (bool end_sequence);
19132 /* Check address and if invalid nop-out the rest of the lines in this
19134 void check_line_address (struct dwarf2_cu *cu,
19135 const gdb_byte *line_ptr,
19136 CORE_ADDR lowpc, CORE_ADDR address);
19138 void handle_set_discriminator (unsigned int discriminator)
19140 m_discriminator = discriminator;
19141 m_line_has_non_zero_discriminator |= discriminator != 0;
19144 /* Handle DW_LNE_set_address. */
19145 void handle_set_address (CORE_ADDR baseaddr, CORE_ADDR address)
19148 address += baseaddr;
19149 m_address = gdbarch_adjust_dwarf2_line (m_gdbarch, address, false);
19152 /* Handle DW_LNS_advance_pc. */
19153 void handle_advance_pc (CORE_ADDR adjust);
19155 /* Handle a special opcode. */
19156 void handle_special_opcode (unsigned char op_code);
19158 /* Handle DW_LNS_advance_line. */
19159 void handle_advance_line (int line_delta)
19161 advance_line (line_delta);
19164 /* Handle DW_LNS_set_file. */
19165 void handle_set_file (file_name_index file);
19167 /* Handle DW_LNS_negate_stmt. */
19168 void handle_negate_stmt ()
19170 m_is_stmt = !m_is_stmt;
19173 /* Handle DW_LNS_const_add_pc. */
19174 void handle_const_add_pc ();
19176 /* Handle DW_LNS_fixed_advance_pc. */
19177 void handle_fixed_advance_pc (CORE_ADDR addr_adj)
19179 m_address += gdbarch_adjust_dwarf2_line (m_gdbarch, addr_adj, true);
19183 /* Handle DW_LNS_copy. */
19184 void handle_copy ()
19186 record_line (false);
19187 m_discriminator = 0;
19190 /* Handle DW_LNE_end_sequence. */
19191 void handle_end_sequence ()
19193 m_record_line_callback = ::record_line;
19197 /* Advance the line by LINE_DELTA. */
19198 void advance_line (int line_delta)
19200 m_line += line_delta;
19202 if (line_delta != 0)
19203 m_line_has_non_zero_discriminator = m_discriminator != 0;
19206 gdbarch *m_gdbarch;
19208 /* True if we're recording lines.
19209 Otherwise we're building partial symtabs and are just interested in
19210 finding include files mentioned by the line number program. */
19211 bool m_record_lines_p;
19213 /* The line number header. */
19214 line_header *m_line_header;
19216 /* These are part of the standard DWARF line number state machine,
19217 and initialized according to the DWARF spec. */
19219 unsigned char m_op_index = 0;
19220 /* The line table index (1-based) of the current file. */
19221 file_name_index m_file = (file_name_index) 1;
19222 unsigned int m_line = 1;
19224 /* These are initialized in the constructor. */
19226 CORE_ADDR m_address;
19228 unsigned int m_discriminator;
19230 /* Additional bits of state we need to track. */
19232 /* The last file that we called dwarf2_start_subfile for.
19233 This is only used for TLLs. */
19234 unsigned int m_last_file = 0;
19235 /* The last file a line number was recorded for. */
19236 struct subfile *m_last_subfile = NULL;
19238 /* The function to call to record a line. */
19239 record_line_ftype *m_record_line_callback = NULL;
19241 /* The last line number that was recorded, used to coalesce
19242 consecutive entries for the same line. This can happen, for
19243 example, when discriminators are present. PR 17276. */
19244 unsigned int m_last_line = 0;
19245 bool m_line_has_non_zero_discriminator = false;
19249 lnp_state_machine::handle_advance_pc (CORE_ADDR adjust)
19251 CORE_ADDR addr_adj = (((m_op_index + adjust)
19252 / m_line_header->maximum_ops_per_instruction)
19253 * m_line_header->minimum_instruction_length);
19254 m_address += gdbarch_adjust_dwarf2_line (m_gdbarch, addr_adj, true);
19255 m_op_index = ((m_op_index + adjust)
19256 % m_line_header->maximum_ops_per_instruction);
19260 lnp_state_machine::handle_special_opcode (unsigned char op_code)
19262 unsigned char adj_opcode = op_code - m_line_header->opcode_base;
19263 CORE_ADDR addr_adj = (((m_op_index
19264 + (adj_opcode / m_line_header->line_range))
19265 / m_line_header->maximum_ops_per_instruction)
19266 * m_line_header->minimum_instruction_length);
19267 m_address += gdbarch_adjust_dwarf2_line (m_gdbarch, addr_adj, true);
19268 m_op_index = ((m_op_index + (adj_opcode / m_line_header->line_range))
19269 % m_line_header->maximum_ops_per_instruction);
19271 int line_delta = (m_line_header->line_base
19272 + (adj_opcode % m_line_header->line_range));
19273 advance_line (line_delta);
19274 record_line (false);
19275 m_discriminator = 0;
19279 lnp_state_machine::handle_set_file (file_name_index file)
19283 const file_entry *fe = current_file ();
19285 dwarf2_debug_line_missing_file_complaint ();
19286 else if (m_record_lines_p)
19288 const char *dir = fe->include_dir (m_line_header);
19290 m_last_subfile = current_subfile;
19291 m_line_has_non_zero_discriminator = m_discriminator != 0;
19292 dwarf2_start_subfile (fe->name, dir);
19297 lnp_state_machine::handle_const_add_pc ()
19300 = (255 - m_line_header->opcode_base) / m_line_header->line_range;
19303 = (((m_op_index + adjust)
19304 / m_line_header->maximum_ops_per_instruction)
19305 * m_line_header->minimum_instruction_length);
19307 m_address += gdbarch_adjust_dwarf2_line (m_gdbarch, addr_adj, true);
19308 m_op_index = ((m_op_index + adjust)
19309 % m_line_header->maximum_ops_per_instruction);
19312 /* Ignore this record_line request. */
19315 noop_record_line (struct subfile *subfile, int line, CORE_ADDR pc)
19320 /* Return non-zero if we should add LINE to the line number table.
19321 LINE is the line to add, LAST_LINE is the last line that was added,
19322 LAST_SUBFILE is the subfile for LAST_LINE.
19323 LINE_HAS_NON_ZERO_DISCRIMINATOR is non-zero if LINE has ever
19324 had a non-zero discriminator.
19326 We have to be careful in the presence of discriminators.
19327 E.g., for this line:
19329 for (i = 0; i < 100000; i++);
19331 clang can emit four line number entries for that one line,
19332 each with a different discriminator.
19333 See gdb.dwarf2/dw2-single-line-discriminators.exp for an example.
19335 However, we want gdb to coalesce all four entries into one.
19336 Otherwise the user could stepi into the middle of the line and
19337 gdb would get confused about whether the pc really was in the
19338 middle of the line.
19340 Things are further complicated by the fact that two consecutive
19341 line number entries for the same line is a heuristic used by gcc
19342 to denote the end of the prologue. So we can't just discard duplicate
19343 entries, we have to be selective about it. The heuristic we use is
19344 that we only collapse consecutive entries for the same line if at least
19345 one of those entries has a non-zero discriminator. PR 17276.
19347 Note: Addresses in the line number state machine can never go backwards
19348 within one sequence, thus this coalescing is ok. */
19351 dwarf_record_line_p (unsigned int line, unsigned int last_line,
19352 int line_has_non_zero_discriminator,
19353 struct subfile *last_subfile)
19355 if (current_subfile != last_subfile)
19357 if (line != last_line)
19359 /* Same line for the same file that we've seen already.
19360 As a last check, for pr 17276, only record the line if the line
19361 has never had a non-zero discriminator. */
19362 if (!line_has_non_zero_discriminator)
19367 /* Use P_RECORD_LINE to record line number LINE beginning at address ADDRESS
19368 in the line table of subfile SUBFILE. */
19371 dwarf_record_line_1 (struct gdbarch *gdbarch, struct subfile *subfile,
19372 unsigned int line, CORE_ADDR address,
19373 record_line_ftype p_record_line)
19375 CORE_ADDR addr = gdbarch_addr_bits_remove (gdbarch, address);
19377 if (dwarf_line_debug)
19379 fprintf_unfiltered (gdb_stdlog,
19380 "Recording line %u, file %s, address %s\n",
19381 line, lbasename (subfile->name),
19382 paddress (gdbarch, address));
19385 (*p_record_line) (subfile, line, addr);
19388 /* Subroutine of dwarf_decode_lines_1 to simplify it.
19389 Mark the end of a set of line number records.
19390 The arguments are the same as for dwarf_record_line_1.
19391 If SUBFILE is NULL the request is ignored. */
19394 dwarf_finish_line (struct gdbarch *gdbarch, struct subfile *subfile,
19395 CORE_ADDR address, record_line_ftype p_record_line)
19397 if (subfile == NULL)
19400 if (dwarf_line_debug)
19402 fprintf_unfiltered (gdb_stdlog,
19403 "Finishing current line, file %s, address %s\n",
19404 lbasename (subfile->name),
19405 paddress (gdbarch, address));
19408 dwarf_record_line_1 (gdbarch, subfile, 0, address, p_record_line);
19412 lnp_state_machine::record_line (bool end_sequence)
19414 if (dwarf_line_debug)
19416 fprintf_unfiltered (gdb_stdlog,
19417 "Processing actual line %u: file %u,"
19418 " address %s, is_stmt %u, discrim %u\n",
19419 m_line, to_underlying (m_file),
19420 paddress (m_gdbarch, m_address),
19421 m_is_stmt, m_discriminator);
19424 file_entry *fe = current_file ();
19427 dwarf2_debug_line_missing_file_complaint ();
19428 /* For now we ignore lines not starting on an instruction boundary.
19429 But not when processing end_sequence for compatibility with the
19430 previous version of the code. */
19431 else if (m_op_index == 0 || end_sequence)
19433 fe->included_p = 1;
19434 if (m_record_lines_p && m_is_stmt)
19436 if (m_last_subfile != current_subfile || end_sequence)
19438 dwarf_finish_line (m_gdbarch, m_last_subfile,
19439 m_address, m_record_line_callback);
19444 if (dwarf_record_line_p (m_line, m_last_line,
19445 m_line_has_non_zero_discriminator,
19448 dwarf_record_line_1 (m_gdbarch, current_subfile,
19450 m_record_line_callback);
19452 m_last_subfile = current_subfile;
19453 m_last_line = m_line;
19459 lnp_state_machine::lnp_state_machine (gdbarch *arch, line_header *lh,
19460 bool record_lines_p)
19463 m_record_lines_p = record_lines_p;
19464 m_line_header = lh;
19466 m_record_line_callback = ::record_line;
19468 /* Call `gdbarch_adjust_dwarf2_line' on the initial 0 address as if there
19469 was a line entry for it so that the backend has a chance to adjust it
19470 and also record it in case it needs it. This is currently used by MIPS
19471 code, cf. `mips_adjust_dwarf2_line'. */
19472 m_address = gdbarch_adjust_dwarf2_line (arch, 0, 0);
19473 m_is_stmt = lh->default_is_stmt;
19474 m_discriminator = 0;
19478 lnp_state_machine::check_line_address (struct dwarf2_cu *cu,
19479 const gdb_byte *line_ptr,
19480 CORE_ADDR lowpc, CORE_ADDR address)
19482 /* If address < lowpc then it's not a usable value, it's outside the
19483 pc range of the CU. However, we restrict the test to only address
19484 values of zero to preserve GDB's previous behaviour which is to
19485 handle the specific case of a function being GC'd by the linker. */
19487 if (address == 0 && address < lowpc)
19489 /* This line table is for a function which has been
19490 GCd by the linker. Ignore it. PR gdb/12528 */
19492 struct objfile *objfile = cu->objfile;
19493 long line_offset = line_ptr - get_debug_line_section (cu)->buffer;
19495 complaint (&symfile_complaints,
19496 _(".debug_line address at offset 0x%lx is 0 [in module %s]"),
19497 line_offset, objfile_name (objfile));
19498 m_record_line_callback = noop_record_line;
19499 /* Note: record_line_callback is left as noop_record_line until
19500 we see DW_LNE_end_sequence. */
19504 /* Subroutine of dwarf_decode_lines to simplify it.
19505 Process the line number information in LH.
19506 If DECODE_FOR_PST_P is non-zero, all we do is process the line number
19507 program in order to set included_p for every referenced header. */
19510 dwarf_decode_lines_1 (struct line_header *lh, struct dwarf2_cu *cu,
19511 const int decode_for_pst_p, CORE_ADDR lowpc)
19513 const gdb_byte *line_ptr, *extended_end;
19514 const gdb_byte *line_end;
19515 unsigned int bytes_read, extended_len;
19516 unsigned char op_code, extended_op;
19517 CORE_ADDR baseaddr;
19518 struct objfile *objfile = cu->objfile;
19519 bfd *abfd = objfile->obfd;
19520 struct gdbarch *gdbarch = get_objfile_arch (objfile);
19521 /* True if we're recording line info (as opposed to building partial
19522 symtabs and just interested in finding include files mentioned by
19523 the line number program). */
19524 bool record_lines_p = !decode_for_pst_p;
19526 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
19528 line_ptr = lh->statement_program_start;
19529 line_end = lh->statement_program_end;
19531 /* Read the statement sequences until there's nothing left. */
19532 while (line_ptr < line_end)
19534 /* The DWARF line number program state machine. Reset the state
19535 machine at the start of each sequence. */
19536 lnp_state_machine state_machine (gdbarch, lh, record_lines_p);
19537 bool end_sequence = false;
19539 if (record_lines_p)
19541 /* Start a subfile for the current file of the state
19543 const file_entry *fe = state_machine.current_file ();
19546 dwarf2_start_subfile (fe->name, fe->include_dir (lh));
19549 /* Decode the table. */
19550 while (line_ptr < line_end && !end_sequence)
19552 op_code = read_1_byte (abfd, line_ptr);
19555 if (op_code >= lh->opcode_base)
19557 /* Special opcode. */
19558 state_machine.handle_special_opcode (op_code);
19560 else switch (op_code)
19562 case DW_LNS_extended_op:
19563 extended_len = read_unsigned_leb128 (abfd, line_ptr,
19565 line_ptr += bytes_read;
19566 extended_end = line_ptr + extended_len;
19567 extended_op = read_1_byte (abfd, line_ptr);
19569 switch (extended_op)
19571 case DW_LNE_end_sequence:
19572 state_machine.handle_end_sequence ();
19573 end_sequence = true;
19575 case DW_LNE_set_address:
19578 = read_address (abfd, line_ptr, cu, &bytes_read);
19579 line_ptr += bytes_read;
19581 state_machine.check_line_address (cu, line_ptr,
19583 state_machine.handle_set_address (baseaddr, address);
19586 case DW_LNE_define_file:
19588 const char *cur_file;
19589 unsigned int mod_time, length;
19592 cur_file = read_direct_string (abfd, line_ptr,
19594 line_ptr += bytes_read;
19595 dindex = (dir_index)
19596 read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
19597 line_ptr += bytes_read;
19599 read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
19600 line_ptr += bytes_read;
19602 read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
19603 line_ptr += bytes_read;
19604 lh->add_file_name (cur_file, dindex, mod_time, length);
19607 case DW_LNE_set_discriminator:
19609 /* The discriminator is not interesting to the
19610 debugger; just ignore it. We still need to
19611 check its value though:
19612 if there are consecutive entries for the same
19613 (non-prologue) line we want to coalesce them.
19616 = read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
19617 line_ptr += bytes_read;
19619 state_machine.handle_set_discriminator (discr);
19623 complaint (&symfile_complaints,
19624 _("mangled .debug_line section"));
19627 /* Make sure that we parsed the extended op correctly. If e.g.
19628 we expected a different address size than the producer used,
19629 we may have read the wrong number of bytes. */
19630 if (line_ptr != extended_end)
19632 complaint (&symfile_complaints,
19633 _("mangled .debug_line section"));
19638 state_machine.handle_copy ();
19640 case DW_LNS_advance_pc:
19643 = read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
19644 line_ptr += bytes_read;
19646 state_machine.handle_advance_pc (adjust);
19649 case DW_LNS_advance_line:
19652 = read_signed_leb128 (abfd, line_ptr, &bytes_read);
19653 line_ptr += bytes_read;
19655 state_machine.handle_advance_line (line_delta);
19658 case DW_LNS_set_file:
19660 file_name_index file
19661 = (file_name_index) read_unsigned_leb128 (abfd, line_ptr,
19663 line_ptr += bytes_read;
19665 state_machine.handle_set_file (file);
19668 case DW_LNS_set_column:
19669 (void) read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
19670 line_ptr += bytes_read;
19672 case DW_LNS_negate_stmt:
19673 state_machine.handle_negate_stmt ();
19675 case DW_LNS_set_basic_block:
19677 /* Add to the address register of the state machine the
19678 address increment value corresponding to special opcode
19679 255. I.e., this value is scaled by the minimum
19680 instruction length since special opcode 255 would have
19681 scaled the increment. */
19682 case DW_LNS_const_add_pc:
19683 state_machine.handle_const_add_pc ();
19685 case DW_LNS_fixed_advance_pc:
19687 CORE_ADDR addr_adj = read_2_bytes (abfd, line_ptr);
19690 state_machine.handle_fixed_advance_pc (addr_adj);
19695 /* Unknown standard opcode, ignore it. */
19698 for (i = 0; i < lh->standard_opcode_lengths[op_code]; i++)
19700 (void) read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
19701 line_ptr += bytes_read;
19708 dwarf2_debug_line_missing_end_sequence_complaint ();
19710 /* We got a DW_LNE_end_sequence (or we ran off the end of the buffer,
19711 in which case we still finish recording the last line). */
19712 state_machine.record_line (true);
19716 /* Decode the Line Number Program (LNP) for the given line_header
19717 structure and CU. The actual information extracted and the type
19718 of structures created from the LNP depends on the value of PST.
19720 1. If PST is NULL, then this procedure uses the data from the program
19721 to create all necessary symbol tables, and their linetables.
19723 2. If PST is not NULL, this procedure reads the program to determine
19724 the list of files included by the unit represented by PST, and
19725 builds all the associated partial symbol tables.
19727 COMP_DIR is the compilation directory (DW_AT_comp_dir) or NULL if unknown.
19728 It is used for relative paths in the line table.
19729 NOTE: When processing partial symtabs (pst != NULL),
19730 comp_dir == pst->dirname.
19732 NOTE: It is important that psymtabs have the same file name (via strcmp)
19733 as the corresponding symtab. Since COMP_DIR is not used in the name of the
19734 symtab we don't use it in the name of the psymtabs we create.
19735 E.g. expand_line_sal requires this when finding psymtabs to expand.
19736 A good testcase for this is mb-inline.exp.
19738 LOWPC is the lowest address in CU (or 0 if not known).
19740 Boolean DECODE_MAPPING specifies we need to fully decode .debug_line
19741 for its PC<->lines mapping information. Otherwise only the filename
19742 table is read in. */
19745 dwarf_decode_lines (struct line_header *lh, const char *comp_dir,
19746 struct dwarf2_cu *cu, struct partial_symtab *pst,
19747 CORE_ADDR lowpc, int decode_mapping)
19749 struct objfile *objfile = cu->objfile;
19750 const int decode_for_pst_p = (pst != NULL);
19752 if (decode_mapping)
19753 dwarf_decode_lines_1 (lh, cu, decode_for_pst_p, lowpc);
19755 if (decode_for_pst_p)
19759 /* Now that we're done scanning the Line Header Program, we can
19760 create the psymtab of each included file. */
19761 for (file_index = 0; file_index < lh->file_names.size (); file_index++)
19762 if (lh->file_names[file_index].included_p == 1)
19764 const char *include_name =
19765 psymtab_include_file_name (lh, file_index, pst, comp_dir);
19766 if (include_name != NULL)
19767 dwarf2_create_include_psymtab (include_name, pst, objfile);
19772 /* Make sure a symtab is created for every file, even files
19773 which contain only variables (i.e. no code with associated
19775 struct compunit_symtab *cust = buildsym_compunit_symtab ();
19778 for (i = 0; i < lh->file_names.size (); i++)
19780 file_entry &fe = lh->file_names[i];
19782 dwarf2_start_subfile (fe.name, fe.include_dir (lh));
19784 if (current_subfile->symtab == NULL)
19786 current_subfile->symtab
19787 = allocate_symtab (cust, current_subfile->name);
19789 fe.symtab = current_subfile->symtab;
19794 /* Start a subfile for DWARF. FILENAME is the name of the file and
19795 DIRNAME the name of the source directory which contains FILENAME
19796 or NULL if not known.
19797 This routine tries to keep line numbers from identical absolute and
19798 relative file names in a common subfile.
19800 Using the `list' example from the GDB testsuite, which resides in
19801 /srcdir and compiling it with Irix6.2 cc in /compdir using a filename
19802 of /srcdir/list0.c yields the following debugging information for list0.c:
19804 DW_AT_name: /srcdir/list0.c
19805 DW_AT_comp_dir: /compdir
19806 files.files[0].name: list0.h
19807 files.files[0].dir: /srcdir
19808 files.files[1].name: list0.c
19809 files.files[1].dir: /srcdir
19811 The line number information for list0.c has to end up in a single
19812 subfile, so that `break /srcdir/list0.c:1' works as expected.
19813 start_subfile will ensure that this happens provided that we pass the
19814 concatenation of files.files[1].dir and files.files[1].name as the
19818 dwarf2_start_subfile (const char *filename, const char *dirname)
19822 /* In order not to lose the line information directory,
19823 we concatenate it to the filename when it makes sense.
19824 Note that the Dwarf3 standard says (speaking of filenames in line
19825 information): ``The directory index is ignored for file names
19826 that represent full path names''. Thus ignoring dirname in the
19827 `else' branch below isn't an issue. */
19829 if (!IS_ABSOLUTE_PATH (filename) && dirname != NULL)
19831 copy = concat (dirname, SLASH_STRING, filename, (char *)NULL);
19835 start_subfile (filename);
19841 /* Start a symtab for DWARF.
19842 NAME, COMP_DIR, LOW_PC are passed to start_symtab. */
19844 static struct compunit_symtab *
19845 dwarf2_start_symtab (struct dwarf2_cu *cu,
19846 const char *name, const char *comp_dir, CORE_ADDR low_pc)
19848 struct compunit_symtab *cust
19849 = start_symtab (cu->objfile, name, comp_dir, low_pc, cu->language);
19851 record_debugformat ("DWARF 2");
19852 record_producer (cu->producer);
19854 /* We assume that we're processing GCC output. */
19855 processing_gcc_compilation = 2;
19857 cu->processing_has_namespace_info = 0;
19863 var_decode_location (struct attribute *attr, struct symbol *sym,
19864 struct dwarf2_cu *cu)
19866 struct objfile *objfile = cu->objfile;
19867 struct comp_unit_head *cu_header = &cu->header;
19869 /* NOTE drow/2003-01-30: There used to be a comment and some special
19870 code here to turn a symbol with DW_AT_external and a
19871 SYMBOL_VALUE_ADDRESS of 0 into a LOC_UNRESOLVED symbol. This was
19872 necessary for platforms (maybe Alpha, certainly PowerPC GNU/Linux
19873 with some versions of binutils) where shared libraries could have
19874 relocations against symbols in their debug information - the
19875 minimal symbol would have the right address, but the debug info
19876 would not. It's no longer necessary, because we will explicitly
19877 apply relocations when we read in the debug information now. */
19879 /* A DW_AT_location attribute with no contents indicates that a
19880 variable has been optimized away. */
19881 if (attr_form_is_block (attr) && DW_BLOCK (attr)->size == 0)
19883 SYMBOL_ACLASS_INDEX (sym) = LOC_OPTIMIZED_OUT;
19887 /* Handle one degenerate form of location expression specially, to
19888 preserve GDB's previous behavior when section offsets are
19889 specified. If this is just a DW_OP_addr or DW_OP_GNU_addr_index
19890 then mark this symbol as LOC_STATIC. */
19892 if (attr_form_is_block (attr)
19893 && ((DW_BLOCK (attr)->data[0] == DW_OP_addr
19894 && DW_BLOCK (attr)->size == 1 + cu_header->addr_size)
19895 || (DW_BLOCK (attr)->data[0] == DW_OP_GNU_addr_index
19896 && (DW_BLOCK (attr)->size
19897 == 1 + leb128_size (&DW_BLOCK (attr)->data[1])))))
19899 unsigned int dummy;
19901 if (DW_BLOCK (attr)->data[0] == DW_OP_addr)
19902 SYMBOL_VALUE_ADDRESS (sym) =
19903 read_address (objfile->obfd, DW_BLOCK (attr)->data + 1, cu, &dummy);
19905 SYMBOL_VALUE_ADDRESS (sym) =
19906 read_addr_index_from_leb128 (cu, DW_BLOCK (attr)->data + 1, &dummy);
19907 SYMBOL_ACLASS_INDEX (sym) = LOC_STATIC;
19908 fixup_symbol_section (sym, objfile);
19909 SYMBOL_VALUE_ADDRESS (sym) += ANOFFSET (objfile->section_offsets,
19910 SYMBOL_SECTION (sym));
19914 /* NOTE drow/2002-01-30: It might be worthwhile to have a static
19915 expression evaluator, and use LOC_COMPUTED only when necessary
19916 (i.e. when the value of a register or memory location is
19917 referenced, or a thread-local block, etc.). Then again, it might
19918 not be worthwhile. I'm assuming that it isn't unless performance
19919 or memory numbers show me otherwise. */
19921 dwarf2_symbol_mark_computed (attr, sym, cu, 0);
19923 if (SYMBOL_COMPUTED_OPS (sym)->location_has_loclist)
19924 cu->has_loclist = 1;
19927 /* Given a pointer to a DWARF information entry, figure out if we need
19928 to make a symbol table entry for it, and if so, create a new entry
19929 and return a pointer to it.
19930 If TYPE is NULL, determine symbol type from the die, otherwise
19931 used the passed type.
19932 If SPACE is not NULL, use it to hold the new symbol. If it is
19933 NULL, allocate a new symbol on the objfile's obstack. */
19935 static struct symbol *
19936 new_symbol_full (struct die_info *die, struct type *type, struct dwarf2_cu *cu,
19937 struct symbol *space)
19939 struct objfile *objfile = cu->objfile;
19940 struct gdbarch *gdbarch = get_objfile_arch (objfile);
19941 struct symbol *sym = NULL;
19943 struct attribute *attr = NULL;
19944 struct attribute *attr2 = NULL;
19945 CORE_ADDR baseaddr;
19946 struct pending **list_to_add = NULL;
19948 int inlined_func = (die->tag == DW_TAG_inlined_subroutine);
19950 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
19952 name = dwarf2_name (die, cu);
19955 const char *linkagename;
19956 int suppress_add = 0;
19961 sym = allocate_symbol (objfile);
19962 OBJSTAT (objfile, n_syms++);
19964 /* Cache this symbol's name and the name's demangled form (if any). */
19965 SYMBOL_SET_LANGUAGE (sym, cu->language, &objfile->objfile_obstack);
19966 linkagename = dwarf2_physname (name, die, cu);
19967 SYMBOL_SET_NAMES (sym, linkagename, strlen (linkagename), 0, objfile);
19969 /* Fortran does not have mangling standard and the mangling does differ
19970 between gfortran, iFort etc. */
19971 if (cu->language == language_fortran
19972 && symbol_get_demangled_name (&(sym->ginfo)) == NULL)
19973 symbol_set_demangled_name (&(sym->ginfo),
19974 dwarf2_full_name (name, die, cu),
19977 /* Default assumptions.
19978 Use the passed type or decode it from the die. */
19979 SYMBOL_DOMAIN (sym) = VAR_DOMAIN;
19980 SYMBOL_ACLASS_INDEX (sym) = LOC_OPTIMIZED_OUT;
19982 SYMBOL_TYPE (sym) = type;
19984 SYMBOL_TYPE (sym) = die_type (die, cu);
19985 attr = dwarf2_attr (die,
19986 inlined_func ? DW_AT_call_line : DW_AT_decl_line,
19990 SYMBOL_LINE (sym) = DW_UNSND (attr);
19993 attr = dwarf2_attr (die,
19994 inlined_func ? DW_AT_call_file : DW_AT_decl_file,
19998 file_name_index file_index = (file_name_index) DW_UNSND (attr);
19999 struct file_entry *fe;
20001 if (cu->line_header != NULL)
20002 fe = cu->line_header->file_name_at (file_index);
20007 complaint (&symfile_complaints,
20008 _("file index out of range"));
20010 symbol_set_symtab (sym, fe->symtab);
20016 attr = dwarf2_attr (die, DW_AT_low_pc, cu);
20021 addr = attr_value_as_address (attr);
20022 addr = gdbarch_adjust_dwarf2_addr (gdbarch, addr + baseaddr);
20023 SYMBOL_VALUE_ADDRESS (sym) = addr;
20025 SYMBOL_TYPE (sym) = objfile_type (objfile)->builtin_core_addr;
20026 SYMBOL_DOMAIN (sym) = LABEL_DOMAIN;
20027 SYMBOL_ACLASS_INDEX (sym) = LOC_LABEL;
20028 add_symbol_to_list (sym, cu->list_in_scope);
20030 case DW_TAG_subprogram:
20031 /* SYMBOL_BLOCK_VALUE (sym) will be filled in later by
20033 SYMBOL_ACLASS_INDEX (sym) = LOC_BLOCK;
20034 attr2 = dwarf2_attr (die, DW_AT_external, cu);
20035 if ((attr2 && (DW_UNSND (attr2) != 0))
20036 || cu->language == language_ada)
20038 /* Subprograms marked external are stored as a global symbol.
20039 Ada subprograms, whether marked external or not, are always
20040 stored as a global symbol, because we want to be able to
20041 access them globally. For instance, we want to be able
20042 to break on a nested subprogram without having to
20043 specify the context. */
20044 list_to_add = &global_symbols;
20048 list_to_add = cu->list_in_scope;
20051 case DW_TAG_inlined_subroutine:
20052 /* SYMBOL_BLOCK_VALUE (sym) will be filled in later by
20054 SYMBOL_ACLASS_INDEX (sym) = LOC_BLOCK;
20055 SYMBOL_INLINED (sym) = 1;
20056 list_to_add = cu->list_in_scope;
20058 case DW_TAG_template_value_param:
20060 /* Fall through. */
20061 case DW_TAG_constant:
20062 case DW_TAG_variable:
20063 case DW_TAG_member:
20064 /* Compilation with minimal debug info may result in
20065 variables with missing type entries. Change the
20066 misleading `void' type to something sensible. */
20067 if (TYPE_CODE (SYMBOL_TYPE (sym)) == TYPE_CODE_VOID)
20068 SYMBOL_TYPE (sym) = objfile_type (objfile)->builtin_int;
20070 attr = dwarf2_attr (die, DW_AT_const_value, cu);
20071 /* In the case of DW_TAG_member, we should only be called for
20072 static const members. */
20073 if (die->tag == DW_TAG_member)
20075 /* dwarf2_add_field uses die_is_declaration,
20076 so we do the same. */
20077 gdb_assert (die_is_declaration (die, cu));
20082 dwarf2_const_value (attr, sym, cu);
20083 attr2 = dwarf2_attr (die, DW_AT_external, cu);
20086 if (attr2 && (DW_UNSND (attr2) != 0))
20087 list_to_add = &global_symbols;
20089 list_to_add = cu->list_in_scope;
20093 attr = dwarf2_attr (die, DW_AT_location, cu);
20096 var_decode_location (attr, sym, cu);
20097 attr2 = dwarf2_attr (die, DW_AT_external, cu);
20099 /* Fortran explicitly imports any global symbols to the local
20100 scope by DW_TAG_common_block. */
20101 if (cu->language == language_fortran && die->parent
20102 && die->parent->tag == DW_TAG_common_block)
20105 if (SYMBOL_CLASS (sym) == LOC_STATIC
20106 && SYMBOL_VALUE_ADDRESS (sym) == 0
20107 && !dwarf2_per_objfile->has_section_at_zero)
20109 /* When a static variable is eliminated by the linker,
20110 the corresponding debug information is not stripped
20111 out, but the variable address is set to null;
20112 do not add such variables into symbol table. */
20114 else if (attr2 && (DW_UNSND (attr2) != 0))
20116 /* Workaround gfortran PR debug/40040 - it uses
20117 DW_AT_location for variables in -fPIC libraries which may
20118 get overriden by other libraries/executable and get
20119 a different address. Resolve it by the minimal symbol
20120 which may come from inferior's executable using copy
20121 relocation. Make this workaround only for gfortran as for
20122 other compilers GDB cannot guess the minimal symbol
20123 Fortran mangling kind. */
20124 if (cu->language == language_fortran && die->parent
20125 && die->parent->tag == DW_TAG_module
20127 && startswith (cu->producer, "GNU Fortran"))
20128 SYMBOL_ACLASS_INDEX (sym) = LOC_UNRESOLVED;
20130 /* A variable with DW_AT_external is never static,
20131 but it may be block-scoped. */
20132 list_to_add = (cu->list_in_scope == &file_symbols
20133 ? &global_symbols : cu->list_in_scope);
20136 list_to_add = cu->list_in_scope;
20140 /* We do not know the address of this symbol.
20141 If it is an external symbol and we have type information
20142 for it, enter the symbol as a LOC_UNRESOLVED symbol.
20143 The address of the variable will then be determined from
20144 the minimal symbol table whenever the variable is
20146 attr2 = dwarf2_attr (die, DW_AT_external, cu);
20148 /* Fortran explicitly imports any global symbols to the local
20149 scope by DW_TAG_common_block. */
20150 if (cu->language == language_fortran && die->parent
20151 && die->parent->tag == DW_TAG_common_block)
20153 /* SYMBOL_CLASS doesn't matter here because
20154 read_common_block is going to reset it. */
20156 list_to_add = cu->list_in_scope;
20158 else if (attr2 && (DW_UNSND (attr2) != 0)
20159 && dwarf2_attr (die, DW_AT_type, cu) != NULL)
20161 /* A variable with DW_AT_external is never static, but it
20162 may be block-scoped. */
20163 list_to_add = (cu->list_in_scope == &file_symbols
20164 ? &global_symbols : cu->list_in_scope);
20166 SYMBOL_ACLASS_INDEX (sym) = LOC_UNRESOLVED;
20168 else if (!die_is_declaration (die, cu))
20170 /* Use the default LOC_OPTIMIZED_OUT class. */
20171 gdb_assert (SYMBOL_CLASS (sym) == LOC_OPTIMIZED_OUT);
20173 list_to_add = cu->list_in_scope;
20177 case DW_TAG_formal_parameter:
20178 /* If we are inside a function, mark this as an argument. If
20179 not, we might be looking at an argument to an inlined function
20180 when we do not have enough information to show inlined frames;
20181 pretend it's a local variable in that case so that the user can
20183 if (context_stack_depth > 0
20184 && context_stack[context_stack_depth - 1].name != NULL)
20185 SYMBOL_IS_ARGUMENT (sym) = 1;
20186 attr = dwarf2_attr (die, DW_AT_location, cu);
20189 var_decode_location (attr, sym, cu);
20191 attr = dwarf2_attr (die, DW_AT_const_value, cu);
20194 dwarf2_const_value (attr, sym, cu);
20197 list_to_add = cu->list_in_scope;
20199 case DW_TAG_unspecified_parameters:
20200 /* From varargs functions; gdb doesn't seem to have any
20201 interest in this information, so just ignore it for now.
20204 case DW_TAG_template_type_param:
20206 /* Fall through. */
20207 case DW_TAG_class_type:
20208 case DW_TAG_interface_type:
20209 case DW_TAG_structure_type:
20210 case DW_TAG_union_type:
20211 case DW_TAG_set_type:
20212 case DW_TAG_enumeration_type:
20213 SYMBOL_ACLASS_INDEX (sym) = LOC_TYPEDEF;
20214 SYMBOL_DOMAIN (sym) = STRUCT_DOMAIN;
20217 /* NOTE: carlton/2003-11-10: C++ class symbols shouldn't
20218 really ever be static objects: otherwise, if you try
20219 to, say, break of a class's method and you're in a file
20220 which doesn't mention that class, it won't work unless
20221 the check for all static symbols in lookup_symbol_aux
20222 saves you. See the OtherFileClass tests in
20223 gdb.c++/namespace.exp. */
20227 list_to_add = (cu->list_in_scope == &file_symbols
20228 && cu->language == language_cplus
20229 ? &global_symbols : cu->list_in_scope);
20231 /* The semantics of C++ state that "struct foo {
20232 ... }" also defines a typedef for "foo". */
20233 if (cu->language == language_cplus
20234 || cu->language == language_ada
20235 || cu->language == language_d
20236 || cu->language == language_rust)
20238 /* The symbol's name is already allocated along
20239 with this objfile, so we don't need to
20240 duplicate it for the type. */
20241 if (TYPE_NAME (SYMBOL_TYPE (sym)) == 0)
20242 TYPE_NAME (SYMBOL_TYPE (sym)) = SYMBOL_SEARCH_NAME (sym);
20247 case DW_TAG_typedef:
20248 SYMBOL_ACLASS_INDEX (sym) = LOC_TYPEDEF;
20249 SYMBOL_DOMAIN (sym) = VAR_DOMAIN;
20250 list_to_add = cu->list_in_scope;
20252 case DW_TAG_base_type:
20253 case DW_TAG_subrange_type:
20254 SYMBOL_ACLASS_INDEX (sym) = LOC_TYPEDEF;
20255 SYMBOL_DOMAIN (sym) = VAR_DOMAIN;
20256 list_to_add = cu->list_in_scope;
20258 case DW_TAG_enumerator:
20259 attr = dwarf2_attr (die, DW_AT_const_value, cu);
20262 dwarf2_const_value (attr, sym, cu);
20265 /* NOTE: carlton/2003-11-10: See comment above in the
20266 DW_TAG_class_type, etc. block. */
20268 list_to_add = (cu->list_in_scope == &file_symbols
20269 && cu->language == language_cplus
20270 ? &global_symbols : cu->list_in_scope);
20273 case DW_TAG_imported_declaration:
20274 case DW_TAG_namespace:
20275 SYMBOL_ACLASS_INDEX (sym) = LOC_TYPEDEF;
20276 list_to_add = &global_symbols;
20278 case DW_TAG_module:
20279 SYMBOL_ACLASS_INDEX (sym) = LOC_TYPEDEF;
20280 SYMBOL_DOMAIN (sym) = MODULE_DOMAIN;
20281 list_to_add = &global_symbols;
20283 case DW_TAG_common_block:
20284 SYMBOL_ACLASS_INDEX (sym) = LOC_COMMON_BLOCK;
20285 SYMBOL_DOMAIN (sym) = COMMON_BLOCK_DOMAIN;
20286 add_symbol_to_list (sym, cu->list_in_scope);
20289 /* Not a tag we recognize. Hopefully we aren't processing
20290 trash data, but since we must specifically ignore things
20291 we don't recognize, there is nothing else we should do at
20293 complaint (&symfile_complaints, _("unsupported tag: '%s'"),
20294 dwarf_tag_name (die->tag));
20300 sym->hash_next = objfile->template_symbols;
20301 objfile->template_symbols = sym;
20302 list_to_add = NULL;
20305 if (list_to_add != NULL)
20306 add_symbol_to_list (sym, list_to_add);
20308 /* For the benefit of old versions of GCC, check for anonymous
20309 namespaces based on the demangled name. */
20310 if (!cu->processing_has_namespace_info
20311 && cu->language == language_cplus)
20312 cp_scan_for_anonymous_namespaces (sym, objfile);
20317 /* A wrapper for new_symbol_full that always allocates a new symbol. */
20319 static struct symbol *
20320 new_symbol (struct die_info *die, struct type *type, struct dwarf2_cu *cu)
20322 return new_symbol_full (die, type, cu, NULL);
20325 /* Given an attr with a DW_FORM_dataN value in host byte order,
20326 zero-extend it as appropriate for the symbol's type. The DWARF
20327 standard (v4) is not entirely clear about the meaning of using
20328 DW_FORM_dataN for a constant with a signed type, where the type is
20329 wider than the data. The conclusion of a discussion on the DWARF
20330 list was that this is unspecified. We choose to always zero-extend
20331 because that is the interpretation long in use by GCC. */
20334 dwarf2_const_value_data (const struct attribute *attr, struct obstack *obstack,
20335 struct dwarf2_cu *cu, LONGEST *value, int bits)
20337 struct objfile *objfile = cu->objfile;
20338 enum bfd_endian byte_order = bfd_big_endian (objfile->obfd) ?
20339 BFD_ENDIAN_BIG : BFD_ENDIAN_LITTLE;
20340 LONGEST l = DW_UNSND (attr);
20342 if (bits < sizeof (*value) * 8)
20344 l &= ((LONGEST) 1 << bits) - 1;
20347 else if (bits == sizeof (*value) * 8)
20351 gdb_byte *bytes = (gdb_byte *) obstack_alloc (obstack, bits / 8);
20352 store_unsigned_integer (bytes, bits / 8, byte_order, l);
20359 /* Read a constant value from an attribute. Either set *VALUE, or if
20360 the value does not fit in *VALUE, set *BYTES - either already
20361 allocated on the objfile obstack, or newly allocated on OBSTACK,
20362 or, set *BATON, if we translated the constant to a location
20366 dwarf2_const_value_attr (const struct attribute *attr, struct type *type,
20367 const char *name, struct obstack *obstack,
20368 struct dwarf2_cu *cu,
20369 LONGEST *value, const gdb_byte **bytes,
20370 struct dwarf2_locexpr_baton **baton)
20372 struct objfile *objfile = cu->objfile;
20373 struct comp_unit_head *cu_header = &cu->header;
20374 struct dwarf_block *blk;
20375 enum bfd_endian byte_order = (bfd_big_endian (objfile->obfd) ?
20376 BFD_ENDIAN_BIG : BFD_ENDIAN_LITTLE);
20382 switch (attr->form)
20385 case DW_FORM_GNU_addr_index:
20389 if (TYPE_LENGTH (type) != cu_header->addr_size)
20390 dwarf2_const_value_length_mismatch_complaint (name,
20391 cu_header->addr_size,
20392 TYPE_LENGTH (type));
20393 /* Symbols of this form are reasonably rare, so we just
20394 piggyback on the existing location code rather than writing
20395 a new implementation of symbol_computed_ops. */
20396 *baton = XOBNEW (obstack, struct dwarf2_locexpr_baton);
20397 (*baton)->per_cu = cu->per_cu;
20398 gdb_assert ((*baton)->per_cu);
20400 (*baton)->size = 2 + cu_header->addr_size;
20401 data = (gdb_byte *) obstack_alloc (obstack, (*baton)->size);
20402 (*baton)->data = data;
20404 data[0] = DW_OP_addr;
20405 store_unsigned_integer (&data[1], cu_header->addr_size,
20406 byte_order, DW_ADDR (attr));
20407 data[cu_header->addr_size + 1] = DW_OP_stack_value;
20410 case DW_FORM_string:
20412 case DW_FORM_GNU_str_index:
20413 case DW_FORM_GNU_strp_alt:
20414 /* DW_STRING is already allocated on the objfile obstack, point
20416 *bytes = (const gdb_byte *) DW_STRING (attr);
20418 case DW_FORM_block1:
20419 case DW_FORM_block2:
20420 case DW_FORM_block4:
20421 case DW_FORM_block:
20422 case DW_FORM_exprloc:
20423 case DW_FORM_data16:
20424 blk = DW_BLOCK (attr);
20425 if (TYPE_LENGTH (type) != blk->size)
20426 dwarf2_const_value_length_mismatch_complaint (name, blk->size,
20427 TYPE_LENGTH (type));
20428 *bytes = blk->data;
20431 /* The DW_AT_const_value attributes are supposed to carry the
20432 symbol's value "represented as it would be on the target
20433 architecture." By the time we get here, it's already been
20434 converted to host endianness, so we just need to sign- or
20435 zero-extend it as appropriate. */
20436 case DW_FORM_data1:
20437 *bytes = dwarf2_const_value_data (attr, obstack, cu, value, 8);
20439 case DW_FORM_data2:
20440 *bytes = dwarf2_const_value_data (attr, obstack, cu, value, 16);
20442 case DW_FORM_data4:
20443 *bytes = dwarf2_const_value_data (attr, obstack, cu, value, 32);
20445 case DW_FORM_data8:
20446 *bytes = dwarf2_const_value_data (attr, obstack, cu, value, 64);
20449 case DW_FORM_sdata:
20450 case DW_FORM_implicit_const:
20451 *value = DW_SND (attr);
20454 case DW_FORM_udata:
20455 *value = DW_UNSND (attr);
20459 complaint (&symfile_complaints,
20460 _("unsupported const value attribute form: '%s'"),
20461 dwarf_form_name (attr->form));
20468 /* Copy constant value from an attribute to a symbol. */
20471 dwarf2_const_value (const struct attribute *attr, struct symbol *sym,
20472 struct dwarf2_cu *cu)
20474 struct objfile *objfile = cu->objfile;
20476 const gdb_byte *bytes;
20477 struct dwarf2_locexpr_baton *baton;
20479 dwarf2_const_value_attr (attr, SYMBOL_TYPE (sym),
20480 SYMBOL_PRINT_NAME (sym),
20481 &objfile->objfile_obstack, cu,
20482 &value, &bytes, &baton);
20486 SYMBOL_LOCATION_BATON (sym) = baton;
20487 SYMBOL_ACLASS_INDEX (sym) = dwarf2_locexpr_index;
20489 else if (bytes != NULL)
20491 SYMBOL_VALUE_BYTES (sym) = bytes;
20492 SYMBOL_ACLASS_INDEX (sym) = LOC_CONST_BYTES;
20496 SYMBOL_VALUE (sym) = value;
20497 SYMBOL_ACLASS_INDEX (sym) = LOC_CONST;
20501 /* Return the type of the die in question using its DW_AT_type attribute. */
20503 static struct type *
20504 die_type (struct die_info *die, struct dwarf2_cu *cu)
20506 struct attribute *type_attr;
20508 type_attr = dwarf2_attr (die, DW_AT_type, cu);
20511 /* A missing DW_AT_type represents a void type. */
20512 return objfile_type (cu->objfile)->builtin_void;
20515 return lookup_die_type (die, type_attr, cu);
20518 /* True iff CU's producer generates GNAT Ada auxiliary information
20519 that allows to find parallel types through that information instead
20520 of having to do expensive parallel lookups by type name. */
20523 need_gnat_info (struct dwarf2_cu *cu)
20525 /* FIXME: brobecker/2010-10-12: As of now, only the AdaCore version
20526 of GNAT produces this auxiliary information, without any indication
20527 that it is produced. Part of enhancing the FSF version of GNAT
20528 to produce that information will be to put in place an indicator
20529 that we can use in order to determine whether the descriptive type
20530 info is available or not. One suggestion that has been made is
20531 to use a new attribute, attached to the CU die. For now, assume
20532 that the descriptive type info is not available. */
20536 /* Return the auxiliary type of the die in question using its
20537 DW_AT_GNAT_descriptive_type attribute. Returns NULL if the
20538 attribute is not present. */
20540 static struct type *
20541 die_descriptive_type (struct die_info *die, struct dwarf2_cu *cu)
20543 struct attribute *type_attr;
20545 type_attr = dwarf2_attr (die, DW_AT_GNAT_descriptive_type, cu);
20549 return lookup_die_type (die, type_attr, cu);
20552 /* If DIE has a descriptive_type attribute, then set the TYPE's
20553 descriptive type accordingly. */
20556 set_descriptive_type (struct type *type, struct die_info *die,
20557 struct dwarf2_cu *cu)
20559 struct type *descriptive_type = die_descriptive_type (die, cu);
20561 if (descriptive_type)
20563 ALLOCATE_GNAT_AUX_TYPE (type);
20564 TYPE_DESCRIPTIVE_TYPE (type) = descriptive_type;
20568 /* Return the containing type of the die in question using its
20569 DW_AT_containing_type attribute. */
20571 static struct type *
20572 die_containing_type (struct die_info *die, struct dwarf2_cu *cu)
20574 struct attribute *type_attr;
20576 type_attr = dwarf2_attr (die, DW_AT_containing_type, cu);
20578 error (_("Dwarf Error: Problem turning containing type into gdb type "
20579 "[in module %s]"), objfile_name (cu->objfile));
20581 return lookup_die_type (die, type_attr, cu);
20584 /* Return an error marker type to use for the ill formed type in DIE/CU. */
20586 static struct type *
20587 build_error_marker_type (struct dwarf2_cu *cu, struct die_info *die)
20589 struct objfile *objfile = dwarf2_per_objfile->objfile;
20590 char *message, *saved;
20592 message = xstrprintf (_("<unknown type in %s, CU 0x%x, DIE 0x%x>"),
20593 objfile_name (objfile),
20594 to_underlying (cu->header.sect_off),
20595 to_underlying (die->sect_off));
20596 saved = (char *) obstack_copy0 (&objfile->objfile_obstack,
20597 message, strlen (message));
20600 return init_type (objfile, TYPE_CODE_ERROR, 0, saved);
20603 /* Look up the type of DIE in CU using its type attribute ATTR.
20604 ATTR must be one of: DW_AT_type, DW_AT_GNAT_descriptive_type,
20605 DW_AT_containing_type.
20606 If there is no type substitute an error marker. */
20608 static struct type *
20609 lookup_die_type (struct die_info *die, const struct attribute *attr,
20610 struct dwarf2_cu *cu)
20612 struct objfile *objfile = cu->objfile;
20613 struct type *this_type;
20615 gdb_assert (attr->name == DW_AT_type
20616 || attr->name == DW_AT_GNAT_descriptive_type
20617 || attr->name == DW_AT_containing_type);
20619 /* First see if we have it cached. */
20621 if (attr->form == DW_FORM_GNU_ref_alt)
20623 struct dwarf2_per_cu_data *per_cu;
20624 sect_offset sect_off = dwarf2_get_ref_die_offset (attr);
20626 per_cu = dwarf2_find_containing_comp_unit (sect_off, 1, cu->objfile);
20627 this_type = get_die_type_at_offset (sect_off, per_cu);
20629 else if (attr_form_is_ref (attr))
20631 sect_offset sect_off = dwarf2_get_ref_die_offset (attr);
20633 this_type = get_die_type_at_offset (sect_off, cu->per_cu);
20635 else if (attr->form == DW_FORM_ref_sig8)
20637 ULONGEST signature = DW_SIGNATURE (attr);
20639 return get_signatured_type (die, signature, cu);
20643 complaint (&symfile_complaints,
20644 _("Dwarf Error: Bad type attribute %s in DIE"
20645 " at 0x%x [in module %s]"),
20646 dwarf_attr_name (attr->name), to_underlying (die->sect_off),
20647 objfile_name (objfile));
20648 return build_error_marker_type (cu, die);
20651 /* If not cached we need to read it in. */
20653 if (this_type == NULL)
20655 struct die_info *type_die = NULL;
20656 struct dwarf2_cu *type_cu = cu;
20658 if (attr_form_is_ref (attr))
20659 type_die = follow_die_ref (die, attr, &type_cu);
20660 if (type_die == NULL)
20661 return build_error_marker_type (cu, die);
20662 /* If we find the type now, it's probably because the type came
20663 from an inter-CU reference and the type's CU got expanded before
20665 this_type = read_type_die (type_die, type_cu);
20668 /* If we still don't have a type use an error marker. */
20670 if (this_type == NULL)
20671 return build_error_marker_type (cu, die);
20676 /* Return the type in DIE, CU.
20677 Returns NULL for invalid types.
20679 This first does a lookup in die_type_hash,
20680 and only reads the die in if necessary.
20682 NOTE: This can be called when reading in partial or full symbols. */
20684 static struct type *
20685 read_type_die (struct die_info *die, struct dwarf2_cu *cu)
20687 struct type *this_type;
20689 this_type = get_die_type (die, cu);
20693 return read_type_die_1 (die, cu);
20696 /* Read the type in DIE, CU.
20697 Returns NULL for invalid types. */
20699 static struct type *
20700 read_type_die_1 (struct die_info *die, struct dwarf2_cu *cu)
20702 struct type *this_type = NULL;
20706 case DW_TAG_class_type:
20707 case DW_TAG_interface_type:
20708 case DW_TAG_structure_type:
20709 case DW_TAG_union_type:
20710 this_type = read_structure_type (die, cu);
20712 case DW_TAG_enumeration_type:
20713 this_type = read_enumeration_type (die, cu);
20715 case DW_TAG_subprogram:
20716 case DW_TAG_subroutine_type:
20717 case DW_TAG_inlined_subroutine:
20718 this_type = read_subroutine_type (die, cu);
20720 case DW_TAG_array_type:
20721 this_type = read_array_type (die, cu);
20723 case DW_TAG_set_type:
20724 this_type = read_set_type (die, cu);
20726 case DW_TAG_pointer_type:
20727 this_type = read_tag_pointer_type (die, cu);
20729 case DW_TAG_ptr_to_member_type:
20730 this_type = read_tag_ptr_to_member_type (die, cu);
20732 case DW_TAG_reference_type:
20733 this_type = read_tag_reference_type (die, cu, TYPE_CODE_REF);
20735 case DW_TAG_rvalue_reference_type:
20736 this_type = read_tag_reference_type (die, cu, TYPE_CODE_RVALUE_REF);
20738 case DW_TAG_const_type:
20739 this_type = read_tag_const_type (die, cu);
20741 case DW_TAG_volatile_type:
20742 this_type = read_tag_volatile_type (die, cu);
20744 case DW_TAG_restrict_type:
20745 this_type = read_tag_restrict_type (die, cu);
20747 case DW_TAG_string_type:
20748 this_type = read_tag_string_type (die, cu);
20750 case DW_TAG_typedef:
20751 this_type = read_typedef (die, cu);
20753 case DW_TAG_subrange_type:
20754 this_type = read_subrange_type (die, cu);
20756 case DW_TAG_base_type:
20757 this_type = read_base_type (die, cu);
20759 case DW_TAG_unspecified_type:
20760 this_type = read_unspecified_type (die, cu);
20762 case DW_TAG_namespace:
20763 this_type = read_namespace_type (die, cu);
20765 case DW_TAG_module:
20766 this_type = read_module_type (die, cu);
20768 case DW_TAG_atomic_type:
20769 this_type = read_tag_atomic_type (die, cu);
20772 complaint (&symfile_complaints,
20773 _("unexpected tag in read_type_die: '%s'"),
20774 dwarf_tag_name (die->tag));
20781 /* See if we can figure out if the class lives in a namespace. We do
20782 this by looking for a member function; its demangled name will
20783 contain namespace info, if there is any.
20784 Return the computed name or NULL.
20785 Space for the result is allocated on the objfile's obstack.
20786 This is the full-die version of guess_partial_die_structure_name.
20787 In this case we know DIE has no useful parent. */
20790 guess_full_die_structure_name (struct die_info *die, struct dwarf2_cu *cu)
20792 struct die_info *spec_die;
20793 struct dwarf2_cu *spec_cu;
20794 struct die_info *child;
20797 spec_die = die_specification (die, &spec_cu);
20798 if (spec_die != NULL)
20804 for (child = die->child;
20806 child = child->sibling)
20808 if (child->tag == DW_TAG_subprogram)
20810 const char *linkage_name = dw2_linkage_name (child, cu);
20812 if (linkage_name != NULL)
20815 = language_class_name_from_physname (cu->language_defn,
20819 if (actual_name != NULL)
20821 const char *die_name = dwarf2_name (die, cu);
20823 if (die_name != NULL
20824 && strcmp (die_name, actual_name) != 0)
20826 /* Strip off the class name from the full name.
20827 We want the prefix. */
20828 int die_name_len = strlen (die_name);
20829 int actual_name_len = strlen (actual_name);
20831 /* Test for '::' as a sanity check. */
20832 if (actual_name_len > die_name_len + 2
20833 && actual_name[actual_name_len
20834 - die_name_len - 1] == ':')
20835 name = (char *) obstack_copy0 (
20836 &cu->objfile->per_bfd->storage_obstack,
20837 actual_name, actual_name_len - die_name_len - 2);
20840 xfree (actual_name);
20849 /* GCC might emit a nameless typedef that has a linkage name. Determine the
20850 prefix part in such case. See
20851 http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47510. */
20853 static const char *
20854 anonymous_struct_prefix (struct die_info *die, struct dwarf2_cu *cu)
20856 struct attribute *attr;
20859 if (die->tag != DW_TAG_class_type && die->tag != DW_TAG_interface_type
20860 && die->tag != DW_TAG_structure_type && die->tag != DW_TAG_union_type)
20863 if (dwarf2_string_attr (die, DW_AT_name, cu) != NULL)
20866 attr = dw2_linkage_name_attr (die, cu);
20867 if (attr == NULL || DW_STRING (attr) == NULL)
20870 /* dwarf2_name had to be already called. */
20871 gdb_assert (DW_STRING_IS_CANONICAL (attr));
20873 /* Strip the base name, keep any leading namespaces/classes. */
20874 base = strrchr (DW_STRING (attr), ':');
20875 if (base == NULL || base == DW_STRING (attr) || base[-1] != ':')
20878 return (char *) obstack_copy0 (&cu->objfile->per_bfd->storage_obstack,
20880 &base[-1] - DW_STRING (attr));
20883 /* Return the name of the namespace/class that DIE is defined within,
20884 or "" if we can't tell. The caller should not xfree the result.
20886 For example, if we're within the method foo() in the following
20896 then determine_prefix on foo's die will return "N::C". */
20898 static const char *
20899 determine_prefix (struct die_info *die, struct dwarf2_cu *cu)
20901 struct die_info *parent, *spec_die;
20902 struct dwarf2_cu *spec_cu;
20903 struct type *parent_type;
20904 const char *retval;
20906 if (cu->language != language_cplus
20907 && cu->language != language_fortran && cu->language != language_d
20908 && cu->language != language_rust)
20911 retval = anonymous_struct_prefix (die, cu);
20915 /* We have to be careful in the presence of DW_AT_specification.
20916 For example, with GCC 3.4, given the code
20920 // Definition of N::foo.
20924 then we'll have a tree of DIEs like this:
20926 1: DW_TAG_compile_unit
20927 2: DW_TAG_namespace // N
20928 3: DW_TAG_subprogram // declaration of N::foo
20929 4: DW_TAG_subprogram // definition of N::foo
20930 DW_AT_specification // refers to die #3
20932 Thus, when processing die #4, we have to pretend that we're in
20933 the context of its DW_AT_specification, namely the contex of die
20936 spec_die = die_specification (die, &spec_cu);
20937 if (spec_die == NULL)
20938 parent = die->parent;
20941 parent = spec_die->parent;
20945 if (parent == NULL)
20947 else if (parent->building_fullname)
20950 const char *parent_name;
20952 /* It has been seen on RealView 2.2 built binaries,
20953 DW_TAG_template_type_param types actually _defined_ as
20954 children of the parent class:
20957 template class <class Enum> Class{};
20958 Class<enum E> class_e;
20960 1: DW_TAG_class_type (Class)
20961 2: DW_TAG_enumeration_type (E)
20962 3: DW_TAG_enumerator (enum1:0)
20963 3: DW_TAG_enumerator (enum2:1)
20965 2: DW_TAG_template_type_param
20966 DW_AT_type DW_FORM_ref_udata (E)
20968 Besides being broken debug info, it can put GDB into an
20969 infinite loop. Consider:
20971 When we're building the full name for Class<E>, we'll start
20972 at Class, and go look over its template type parameters,
20973 finding E. We'll then try to build the full name of E, and
20974 reach here. We're now trying to build the full name of E,
20975 and look over the parent DIE for containing scope. In the
20976 broken case, if we followed the parent DIE of E, we'd again
20977 find Class, and once again go look at its template type
20978 arguments, etc., etc. Simply don't consider such parent die
20979 as source-level parent of this die (it can't be, the language
20980 doesn't allow it), and break the loop here. */
20981 name = dwarf2_name (die, cu);
20982 parent_name = dwarf2_name (parent, cu);
20983 complaint (&symfile_complaints,
20984 _("template param type '%s' defined within parent '%s'"),
20985 name ? name : "<unknown>",
20986 parent_name ? parent_name : "<unknown>");
20990 switch (parent->tag)
20992 case DW_TAG_namespace:
20993 parent_type = read_type_die (parent, cu);
20994 /* GCC 4.0 and 4.1 had a bug (PR c++/28460) where they generated bogus
20995 DW_TAG_namespace DIEs with a name of "::" for the global namespace.
20996 Work around this problem here. */
20997 if (cu->language == language_cplus
20998 && strcmp (TYPE_TAG_NAME (parent_type), "::") == 0)
21000 /* We give a name to even anonymous namespaces. */
21001 return TYPE_TAG_NAME (parent_type);
21002 case DW_TAG_class_type:
21003 case DW_TAG_interface_type:
21004 case DW_TAG_structure_type:
21005 case DW_TAG_union_type:
21006 case DW_TAG_module:
21007 parent_type = read_type_die (parent, cu);
21008 if (TYPE_TAG_NAME (parent_type) != NULL)
21009 return TYPE_TAG_NAME (parent_type);
21011 /* An anonymous structure is only allowed non-static data
21012 members; no typedefs, no member functions, et cetera.
21013 So it does not need a prefix. */
21015 case DW_TAG_compile_unit:
21016 case DW_TAG_partial_unit:
21017 /* gcc-4.5 -gdwarf-4 can drop the enclosing namespace. Cope. */
21018 if (cu->language == language_cplus
21019 && !VEC_empty (dwarf2_section_info_def, dwarf2_per_objfile->types)
21020 && die->child != NULL
21021 && (die->tag == DW_TAG_class_type
21022 || die->tag == DW_TAG_structure_type
21023 || die->tag == DW_TAG_union_type))
21025 char *name = guess_full_die_structure_name (die, cu);
21030 case DW_TAG_enumeration_type:
21031 parent_type = read_type_die (parent, cu);
21032 if (TYPE_DECLARED_CLASS (parent_type))
21034 if (TYPE_TAG_NAME (parent_type) != NULL)
21035 return TYPE_TAG_NAME (parent_type);
21038 /* Fall through. */
21040 return determine_prefix (parent, cu);
21044 /* Return a newly-allocated string formed by concatenating PREFIX and SUFFIX
21045 with appropriate separator. If PREFIX or SUFFIX is NULL or empty, then
21046 simply copy the SUFFIX or PREFIX, respectively. If OBS is non-null, perform
21047 an obconcat, otherwise allocate storage for the result. The CU argument is
21048 used to determine the language and hence, the appropriate separator. */
21050 #define MAX_SEP_LEN 7 /* strlen ("__") + strlen ("_MOD_") */
21053 typename_concat (struct obstack *obs, const char *prefix, const char *suffix,
21054 int physname, struct dwarf2_cu *cu)
21056 const char *lead = "";
21059 if (suffix == NULL || suffix[0] == '\0'
21060 || prefix == NULL || prefix[0] == '\0')
21062 else if (cu->language == language_d)
21064 /* For D, the 'main' function could be defined in any module, but it
21065 should never be prefixed. */
21066 if (strcmp (suffix, "D main") == 0)
21074 else if (cu->language == language_fortran && physname)
21076 /* This is gfortran specific mangling. Normally DW_AT_linkage_name or
21077 DW_AT_MIPS_linkage_name is preferred and used instead. */
21085 if (prefix == NULL)
21087 if (suffix == NULL)
21094 xmalloc (strlen (prefix) + MAX_SEP_LEN + strlen (suffix) + 1));
21096 strcpy (retval, lead);
21097 strcat (retval, prefix);
21098 strcat (retval, sep);
21099 strcat (retval, suffix);
21104 /* We have an obstack. */
21105 return obconcat (obs, lead, prefix, sep, suffix, (char *) NULL);
21109 /* Return sibling of die, NULL if no sibling. */
21111 static struct die_info *
21112 sibling_die (struct die_info *die)
21114 return die->sibling;
21117 /* Get name of a die, return NULL if not found. */
21119 static const char *
21120 dwarf2_canonicalize_name (const char *name, struct dwarf2_cu *cu,
21121 struct obstack *obstack)
21123 if (name && cu->language == language_cplus)
21125 std::string canon_name = cp_canonicalize_string (name);
21127 if (!canon_name.empty ())
21129 if (canon_name != name)
21130 name = (const char *) obstack_copy0 (obstack,
21131 canon_name.c_str (),
21132 canon_name.length ());
21139 /* Get name of a die, return NULL if not found.
21140 Anonymous namespaces are converted to their magic string. */
21142 static const char *
21143 dwarf2_name (struct die_info *die, struct dwarf2_cu *cu)
21145 struct attribute *attr;
21147 attr = dwarf2_attr (die, DW_AT_name, cu);
21148 if ((!attr || !DW_STRING (attr))
21149 && die->tag != DW_TAG_namespace
21150 && die->tag != DW_TAG_class_type
21151 && die->tag != DW_TAG_interface_type
21152 && die->tag != DW_TAG_structure_type
21153 && die->tag != DW_TAG_union_type)
21158 case DW_TAG_compile_unit:
21159 case DW_TAG_partial_unit:
21160 /* Compilation units have a DW_AT_name that is a filename, not
21161 a source language identifier. */
21162 case DW_TAG_enumeration_type:
21163 case DW_TAG_enumerator:
21164 /* These tags always have simple identifiers already; no need
21165 to canonicalize them. */
21166 return DW_STRING (attr);
21168 case DW_TAG_namespace:
21169 if (attr != NULL && DW_STRING (attr) != NULL)
21170 return DW_STRING (attr);
21171 return CP_ANONYMOUS_NAMESPACE_STR;
21173 case DW_TAG_class_type:
21174 case DW_TAG_interface_type:
21175 case DW_TAG_structure_type:
21176 case DW_TAG_union_type:
21177 /* Some GCC versions emit spurious DW_AT_name attributes for unnamed
21178 structures or unions. These were of the form "._%d" in GCC 4.1,
21179 or simply "<anonymous struct>" or "<anonymous union>" in GCC 4.3
21180 and GCC 4.4. We work around this problem by ignoring these. */
21181 if (attr && DW_STRING (attr)
21182 && (startswith (DW_STRING (attr), "._")
21183 || startswith (DW_STRING (attr), "<anonymous")))
21186 /* GCC might emit a nameless typedef that has a linkage name. See
21187 http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47510. */
21188 if (!attr || DW_STRING (attr) == NULL)
21190 char *demangled = NULL;
21192 attr = dw2_linkage_name_attr (die, cu);
21193 if (attr == NULL || DW_STRING (attr) == NULL)
21196 /* Avoid demangling DW_STRING (attr) the second time on a second
21197 call for the same DIE. */
21198 if (!DW_STRING_IS_CANONICAL (attr))
21199 demangled = gdb_demangle (DW_STRING (attr), DMGL_TYPES);
21205 /* FIXME: we already did this for the partial symbol... */
21208 obstack_copy0 (&cu->objfile->per_bfd->storage_obstack,
21209 demangled, strlen (demangled)));
21210 DW_STRING_IS_CANONICAL (attr) = 1;
21213 /* Strip any leading namespaces/classes, keep only the base name.
21214 DW_AT_name for named DIEs does not contain the prefixes. */
21215 base = strrchr (DW_STRING (attr), ':');
21216 if (base && base > DW_STRING (attr) && base[-1] == ':')
21219 return DW_STRING (attr);
21228 if (!DW_STRING_IS_CANONICAL (attr))
21231 = dwarf2_canonicalize_name (DW_STRING (attr), cu,
21232 &cu->objfile->per_bfd->storage_obstack);
21233 DW_STRING_IS_CANONICAL (attr) = 1;
21235 return DW_STRING (attr);
21238 /* Return the die that this die in an extension of, or NULL if there
21239 is none. *EXT_CU is the CU containing DIE on input, and the CU
21240 containing the return value on output. */
21242 static struct die_info *
21243 dwarf2_extension (struct die_info *die, struct dwarf2_cu **ext_cu)
21245 struct attribute *attr;
21247 attr = dwarf2_attr (die, DW_AT_extension, *ext_cu);
21251 return follow_die_ref (die, attr, ext_cu);
21254 /* Convert a DIE tag into its string name. */
21256 static const char *
21257 dwarf_tag_name (unsigned tag)
21259 const char *name = get_DW_TAG_name (tag);
21262 return "DW_TAG_<unknown>";
21267 /* Convert a DWARF attribute code into its string name. */
21269 static const char *
21270 dwarf_attr_name (unsigned attr)
21274 #ifdef MIPS /* collides with DW_AT_HP_block_index */
21275 if (attr == DW_AT_MIPS_fde)
21276 return "DW_AT_MIPS_fde";
21278 if (attr == DW_AT_HP_block_index)
21279 return "DW_AT_HP_block_index";
21282 name = get_DW_AT_name (attr);
21285 return "DW_AT_<unknown>";
21290 /* Convert a DWARF value form code into its string name. */
21292 static const char *
21293 dwarf_form_name (unsigned form)
21295 const char *name = get_DW_FORM_name (form);
21298 return "DW_FORM_<unknown>";
21303 static const char *
21304 dwarf_bool_name (unsigned mybool)
21312 /* Convert a DWARF type code into its string name. */
21314 static const char *
21315 dwarf_type_encoding_name (unsigned enc)
21317 const char *name = get_DW_ATE_name (enc);
21320 return "DW_ATE_<unknown>";
21326 dump_die_shallow (struct ui_file *f, int indent, struct die_info *die)
21330 print_spaces (indent, f);
21331 fprintf_unfiltered (f, "Die: %s (abbrev %d, offset 0x%x)\n",
21332 dwarf_tag_name (die->tag), die->abbrev,
21333 to_underlying (die->sect_off));
21335 if (die->parent != NULL)
21337 print_spaces (indent, f);
21338 fprintf_unfiltered (f, " parent at offset: 0x%x\n",
21339 to_underlying (die->parent->sect_off));
21342 print_spaces (indent, f);
21343 fprintf_unfiltered (f, " has children: %s\n",
21344 dwarf_bool_name (die->child != NULL));
21346 print_spaces (indent, f);
21347 fprintf_unfiltered (f, " attributes:\n");
21349 for (i = 0; i < die->num_attrs; ++i)
21351 print_spaces (indent, f);
21352 fprintf_unfiltered (f, " %s (%s) ",
21353 dwarf_attr_name (die->attrs[i].name),
21354 dwarf_form_name (die->attrs[i].form));
21356 switch (die->attrs[i].form)
21359 case DW_FORM_GNU_addr_index:
21360 fprintf_unfiltered (f, "address: ");
21361 fputs_filtered (hex_string (DW_ADDR (&die->attrs[i])), f);
21363 case DW_FORM_block2:
21364 case DW_FORM_block4:
21365 case DW_FORM_block:
21366 case DW_FORM_block1:
21367 fprintf_unfiltered (f, "block: size %s",
21368 pulongest (DW_BLOCK (&die->attrs[i])->size));
21370 case DW_FORM_exprloc:
21371 fprintf_unfiltered (f, "expression: size %s",
21372 pulongest (DW_BLOCK (&die->attrs[i])->size));
21374 case DW_FORM_data16:
21375 fprintf_unfiltered (f, "constant of 16 bytes");
21377 case DW_FORM_ref_addr:
21378 fprintf_unfiltered (f, "ref address: ");
21379 fputs_filtered (hex_string (DW_UNSND (&die->attrs[i])), f);
21381 case DW_FORM_GNU_ref_alt:
21382 fprintf_unfiltered (f, "alt ref address: ");
21383 fputs_filtered (hex_string (DW_UNSND (&die->attrs[i])), f);
21389 case DW_FORM_ref_udata:
21390 fprintf_unfiltered (f, "constant ref: 0x%lx (adjusted)",
21391 (long) (DW_UNSND (&die->attrs[i])));
21393 case DW_FORM_data1:
21394 case DW_FORM_data2:
21395 case DW_FORM_data4:
21396 case DW_FORM_data8:
21397 case DW_FORM_udata:
21398 case DW_FORM_sdata:
21399 fprintf_unfiltered (f, "constant: %s",
21400 pulongest (DW_UNSND (&die->attrs[i])));
21402 case DW_FORM_sec_offset:
21403 fprintf_unfiltered (f, "section offset: %s",
21404 pulongest (DW_UNSND (&die->attrs[i])));
21406 case DW_FORM_ref_sig8:
21407 fprintf_unfiltered (f, "signature: %s",
21408 hex_string (DW_SIGNATURE (&die->attrs[i])));
21410 case DW_FORM_string:
21412 case DW_FORM_line_strp:
21413 case DW_FORM_GNU_str_index:
21414 case DW_FORM_GNU_strp_alt:
21415 fprintf_unfiltered (f, "string: \"%s\" (%s canonicalized)",
21416 DW_STRING (&die->attrs[i])
21417 ? DW_STRING (&die->attrs[i]) : "",
21418 DW_STRING_IS_CANONICAL (&die->attrs[i]) ? "is" : "not");
21421 if (DW_UNSND (&die->attrs[i]))
21422 fprintf_unfiltered (f, "flag: TRUE");
21424 fprintf_unfiltered (f, "flag: FALSE");
21426 case DW_FORM_flag_present:
21427 fprintf_unfiltered (f, "flag: TRUE");
21429 case DW_FORM_indirect:
21430 /* The reader will have reduced the indirect form to
21431 the "base form" so this form should not occur. */
21432 fprintf_unfiltered (f,
21433 "unexpected attribute form: DW_FORM_indirect");
21435 case DW_FORM_implicit_const:
21436 fprintf_unfiltered (f, "constant: %s",
21437 plongest (DW_SND (&die->attrs[i])));
21440 fprintf_unfiltered (f, "unsupported attribute form: %d.",
21441 die->attrs[i].form);
21444 fprintf_unfiltered (f, "\n");
21449 dump_die_for_error (struct die_info *die)
21451 dump_die_shallow (gdb_stderr, 0, die);
21455 dump_die_1 (struct ui_file *f, int level, int max_level, struct die_info *die)
21457 int indent = level * 4;
21459 gdb_assert (die != NULL);
21461 if (level >= max_level)
21464 dump_die_shallow (f, indent, die);
21466 if (die->child != NULL)
21468 print_spaces (indent, f);
21469 fprintf_unfiltered (f, " Children:");
21470 if (level + 1 < max_level)
21472 fprintf_unfiltered (f, "\n");
21473 dump_die_1 (f, level + 1, max_level, die->child);
21477 fprintf_unfiltered (f,
21478 " [not printed, max nesting level reached]\n");
21482 if (die->sibling != NULL && level > 0)
21484 dump_die_1 (f, level, max_level, die->sibling);
21488 /* This is called from the pdie macro in gdbinit.in.
21489 It's not static so gcc will keep a copy callable from gdb. */
21492 dump_die (struct die_info *die, int max_level)
21494 dump_die_1 (gdb_stdlog, 0, max_level, die);
21498 store_in_ref_table (struct die_info *die, struct dwarf2_cu *cu)
21502 slot = htab_find_slot_with_hash (cu->die_hash, die,
21503 to_underlying (die->sect_off),
21509 /* Return DIE offset of ATTR. Return 0 with complaint if ATTR is not of the
21513 dwarf2_get_ref_die_offset (const struct attribute *attr)
21515 if (attr_form_is_ref (attr))
21516 return (sect_offset) DW_UNSND (attr);
21518 complaint (&symfile_complaints,
21519 _("unsupported die ref attribute form: '%s'"),
21520 dwarf_form_name (attr->form));
21524 /* Return the constant value held by ATTR. Return DEFAULT_VALUE if
21525 * the value held by the attribute is not constant. */
21528 dwarf2_get_attr_constant_value (const struct attribute *attr, int default_value)
21530 if (attr->form == DW_FORM_sdata || attr->form == DW_FORM_implicit_const)
21531 return DW_SND (attr);
21532 else if (attr->form == DW_FORM_udata
21533 || attr->form == DW_FORM_data1
21534 || attr->form == DW_FORM_data2
21535 || attr->form == DW_FORM_data4
21536 || attr->form == DW_FORM_data8)
21537 return DW_UNSND (attr);
21540 /* For DW_FORM_data16 see attr_form_is_constant. */
21541 complaint (&symfile_complaints,
21542 _("Attribute value is not a constant (%s)"),
21543 dwarf_form_name (attr->form));
21544 return default_value;
21548 /* Follow reference or signature attribute ATTR of SRC_DIE.
21549 On entry *REF_CU is the CU of SRC_DIE.
21550 On exit *REF_CU is the CU of the result. */
21552 static struct die_info *
21553 follow_die_ref_or_sig (struct die_info *src_die, const struct attribute *attr,
21554 struct dwarf2_cu **ref_cu)
21556 struct die_info *die;
21558 if (attr_form_is_ref (attr))
21559 die = follow_die_ref (src_die, attr, ref_cu);
21560 else if (attr->form == DW_FORM_ref_sig8)
21561 die = follow_die_sig (src_die, attr, ref_cu);
21564 dump_die_for_error (src_die);
21565 error (_("Dwarf Error: Expected reference attribute [in module %s]"),
21566 objfile_name ((*ref_cu)->objfile));
21572 /* Follow reference OFFSET.
21573 On entry *REF_CU is the CU of the source die referencing OFFSET.
21574 On exit *REF_CU is the CU of the result.
21575 Returns NULL if OFFSET is invalid. */
21577 static struct die_info *
21578 follow_die_offset (sect_offset sect_off, int offset_in_dwz,
21579 struct dwarf2_cu **ref_cu)
21581 struct die_info temp_die;
21582 struct dwarf2_cu *target_cu, *cu = *ref_cu;
21584 gdb_assert (cu->per_cu != NULL);
21588 if (cu->per_cu->is_debug_types)
21590 /* .debug_types CUs cannot reference anything outside their CU.
21591 If they need to, they have to reference a signatured type via
21592 DW_FORM_ref_sig8. */
21593 if (!offset_in_cu_p (&cu->header, sect_off))
21596 else if (offset_in_dwz != cu->per_cu->is_dwz
21597 || !offset_in_cu_p (&cu->header, sect_off))
21599 struct dwarf2_per_cu_data *per_cu;
21601 per_cu = dwarf2_find_containing_comp_unit (sect_off, offset_in_dwz,
21604 /* If necessary, add it to the queue and load its DIEs. */
21605 if (maybe_queue_comp_unit (cu, per_cu, cu->language))
21606 load_full_comp_unit (per_cu, cu->language);
21608 target_cu = per_cu->cu;
21610 else if (cu->dies == NULL)
21612 /* We're loading full DIEs during partial symbol reading. */
21613 gdb_assert (dwarf2_per_objfile->reading_partial_symbols);
21614 load_full_comp_unit (cu->per_cu, language_minimal);
21617 *ref_cu = target_cu;
21618 temp_die.sect_off = sect_off;
21619 return (struct die_info *) htab_find_with_hash (target_cu->die_hash,
21621 to_underlying (sect_off));
21624 /* Follow reference attribute ATTR of SRC_DIE.
21625 On entry *REF_CU is the CU of SRC_DIE.
21626 On exit *REF_CU is the CU of the result. */
21628 static struct die_info *
21629 follow_die_ref (struct die_info *src_die, const struct attribute *attr,
21630 struct dwarf2_cu **ref_cu)
21632 sect_offset sect_off = dwarf2_get_ref_die_offset (attr);
21633 struct dwarf2_cu *cu = *ref_cu;
21634 struct die_info *die;
21636 die = follow_die_offset (sect_off,
21637 (attr->form == DW_FORM_GNU_ref_alt
21638 || cu->per_cu->is_dwz),
21641 error (_("Dwarf Error: Cannot find DIE at 0x%x referenced from DIE "
21642 "at 0x%x [in module %s]"),
21643 to_underlying (sect_off), to_underlying (src_die->sect_off),
21644 objfile_name (cu->objfile));
21649 /* Return DWARF block referenced by DW_AT_location of DIE at SECT_OFF at PER_CU.
21650 Returned value is intended for DW_OP_call*. Returned
21651 dwarf2_locexpr_baton->data has lifetime of PER_CU->OBJFILE. */
21653 struct dwarf2_locexpr_baton
21654 dwarf2_fetch_die_loc_sect_off (sect_offset sect_off,
21655 struct dwarf2_per_cu_data *per_cu,
21656 CORE_ADDR (*get_frame_pc) (void *baton),
21659 struct dwarf2_cu *cu;
21660 struct die_info *die;
21661 struct attribute *attr;
21662 struct dwarf2_locexpr_baton retval;
21664 dw2_setup (per_cu->objfile);
21666 if (per_cu->cu == NULL)
21671 /* We shouldn't get here for a dummy CU, but don't crash on the user.
21672 Instead just throw an error, not much else we can do. */
21673 error (_("Dwarf Error: Dummy CU at 0x%x referenced in module %s"),
21674 to_underlying (sect_off), objfile_name (per_cu->objfile));
21677 die = follow_die_offset (sect_off, per_cu->is_dwz, &cu);
21679 error (_("Dwarf Error: Cannot find DIE at 0x%x referenced in module %s"),
21680 to_underlying (sect_off), objfile_name (per_cu->objfile));
21682 attr = dwarf2_attr (die, DW_AT_location, cu);
21685 /* DWARF: "If there is no such attribute, then there is no effect.".
21686 DATA is ignored if SIZE is 0. */
21688 retval.data = NULL;
21691 else if (attr_form_is_section_offset (attr))
21693 struct dwarf2_loclist_baton loclist_baton;
21694 CORE_ADDR pc = (*get_frame_pc) (baton);
21697 fill_in_loclist_baton (cu, &loclist_baton, attr);
21699 retval.data = dwarf2_find_location_expression (&loclist_baton,
21701 retval.size = size;
21705 if (!attr_form_is_block (attr))
21706 error (_("Dwarf Error: DIE at 0x%x referenced in module %s "
21707 "is neither DW_FORM_block* nor DW_FORM_exprloc"),
21708 to_underlying (sect_off), objfile_name (per_cu->objfile));
21710 retval.data = DW_BLOCK (attr)->data;
21711 retval.size = DW_BLOCK (attr)->size;
21713 retval.per_cu = cu->per_cu;
21715 age_cached_comp_units ();
21720 /* Like dwarf2_fetch_die_loc_sect_off, but take a CU
21723 struct dwarf2_locexpr_baton
21724 dwarf2_fetch_die_loc_cu_off (cu_offset offset_in_cu,
21725 struct dwarf2_per_cu_data *per_cu,
21726 CORE_ADDR (*get_frame_pc) (void *baton),
21729 sect_offset sect_off = per_cu->sect_off + to_underlying (offset_in_cu);
21731 return dwarf2_fetch_die_loc_sect_off (sect_off, per_cu, get_frame_pc, baton);
21734 /* Write a constant of a given type as target-ordered bytes into
21737 static const gdb_byte *
21738 write_constant_as_bytes (struct obstack *obstack,
21739 enum bfd_endian byte_order,
21746 *len = TYPE_LENGTH (type);
21747 result = (gdb_byte *) obstack_alloc (obstack, *len);
21748 store_unsigned_integer (result, *len, byte_order, value);
21753 /* If the DIE at OFFSET in PER_CU has a DW_AT_const_value, return a
21754 pointer to the constant bytes and set LEN to the length of the
21755 data. If memory is needed, allocate it on OBSTACK. If the DIE
21756 does not have a DW_AT_const_value, return NULL. */
21759 dwarf2_fetch_constant_bytes (sect_offset sect_off,
21760 struct dwarf2_per_cu_data *per_cu,
21761 struct obstack *obstack,
21764 struct dwarf2_cu *cu;
21765 struct die_info *die;
21766 struct attribute *attr;
21767 const gdb_byte *result = NULL;
21770 enum bfd_endian byte_order;
21772 dw2_setup (per_cu->objfile);
21774 if (per_cu->cu == NULL)
21779 /* We shouldn't get here for a dummy CU, but don't crash on the user.
21780 Instead just throw an error, not much else we can do. */
21781 error (_("Dwarf Error: Dummy CU at 0x%x referenced in module %s"),
21782 to_underlying (sect_off), objfile_name (per_cu->objfile));
21785 die = follow_die_offset (sect_off, per_cu->is_dwz, &cu);
21787 error (_("Dwarf Error: Cannot find DIE at 0x%x referenced in module %s"),
21788 to_underlying (sect_off), objfile_name (per_cu->objfile));
21791 attr = dwarf2_attr (die, DW_AT_const_value, cu);
21795 byte_order = (bfd_big_endian (per_cu->objfile->obfd)
21796 ? BFD_ENDIAN_BIG : BFD_ENDIAN_LITTLE);
21798 switch (attr->form)
21801 case DW_FORM_GNU_addr_index:
21805 *len = cu->header.addr_size;
21806 tem = (gdb_byte *) obstack_alloc (obstack, *len);
21807 store_unsigned_integer (tem, *len, byte_order, DW_ADDR (attr));
21811 case DW_FORM_string:
21813 case DW_FORM_GNU_str_index:
21814 case DW_FORM_GNU_strp_alt:
21815 /* DW_STRING is already allocated on the objfile obstack, point
21817 result = (const gdb_byte *) DW_STRING (attr);
21818 *len = strlen (DW_STRING (attr));
21820 case DW_FORM_block1:
21821 case DW_FORM_block2:
21822 case DW_FORM_block4:
21823 case DW_FORM_block:
21824 case DW_FORM_exprloc:
21825 case DW_FORM_data16:
21826 result = DW_BLOCK (attr)->data;
21827 *len = DW_BLOCK (attr)->size;
21830 /* The DW_AT_const_value attributes are supposed to carry the
21831 symbol's value "represented as it would be on the target
21832 architecture." By the time we get here, it's already been
21833 converted to host endianness, so we just need to sign- or
21834 zero-extend it as appropriate. */
21835 case DW_FORM_data1:
21836 type = die_type (die, cu);
21837 result = dwarf2_const_value_data (attr, obstack, cu, &value, 8);
21838 if (result == NULL)
21839 result = write_constant_as_bytes (obstack, byte_order,
21842 case DW_FORM_data2:
21843 type = die_type (die, cu);
21844 result = dwarf2_const_value_data (attr, obstack, cu, &value, 16);
21845 if (result == NULL)
21846 result = write_constant_as_bytes (obstack, byte_order,
21849 case DW_FORM_data4:
21850 type = die_type (die, cu);
21851 result = dwarf2_const_value_data (attr, obstack, cu, &value, 32);
21852 if (result == NULL)
21853 result = write_constant_as_bytes (obstack, byte_order,
21856 case DW_FORM_data8:
21857 type = die_type (die, cu);
21858 result = dwarf2_const_value_data (attr, obstack, cu, &value, 64);
21859 if (result == NULL)
21860 result = write_constant_as_bytes (obstack, byte_order,
21864 case DW_FORM_sdata:
21865 case DW_FORM_implicit_const:
21866 type = die_type (die, cu);
21867 result = write_constant_as_bytes (obstack, byte_order,
21868 type, DW_SND (attr), len);
21871 case DW_FORM_udata:
21872 type = die_type (die, cu);
21873 result = write_constant_as_bytes (obstack, byte_order,
21874 type, DW_UNSND (attr), len);
21878 complaint (&symfile_complaints,
21879 _("unsupported const value attribute form: '%s'"),
21880 dwarf_form_name (attr->form));
21887 /* Return the type of the die at OFFSET in PER_CU. Return NULL if no
21888 valid type for this die is found. */
21891 dwarf2_fetch_die_type_sect_off (sect_offset sect_off,
21892 struct dwarf2_per_cu_data *per_cu)
21894 struct dwarf2_cu *cu;
21895 struct die_info *die;
21897 dw2_setup (per_cu->objfile);
21899 if (per_cu->cu == NULL)
21905 die = follow_die_offset (sect_off, per_cu->is_dwz, &cu);
21909 return die_type (die, cu);
21912 /* Return the type of the DIE at DIE_OFFSET in the CU named by
21916 dwarf2_get_die_type (cu_offset die_offset,
21917 struct dwarf2_per_cu_data *per_cu)
21919 dw2_setup (per_cu->objfile);
21921 sect_offset die_offset_sect = per_cu->sect_off + to_underlying (die_offset);
21922 return get_die_type_at_offset (die_offset_sect, per_cu);
21925 /* Follow type unit SIG_TYPE referenced by SRC_DIE.
21926 On entry *REF_CU is the CU of SRC_DIE.
21927 On exit *REF_CU is the CU of the result.
21928 Returns NULL if the referenced DIE isn't found. */
21930 static struct die_info *
21931 follow_die_sig_1 (struct die_info *src_die, struct signatured_type *sig_type,
21932 struct dwarf2_cu **ref_cu)
21934 struct die_info temp_die;
21935 struct dwarf2_cu *sig_cu;
21936 struct die_info *die;
21938 /* While it might be nice to assert sig_type->type == NULL here,
21939 we can get here for DW_AT_imported_declaration where we need
21940 the DIE not the type. */
21942 /* If necessary, add it to the queue and load its DIEs. */
21944 if (maybe_queue_comp_unit (*ref_cu, &sig_type->per_cu, language_minimal))
21945 read_signatured_type (sig_type);
21947 sig_cu = sig_type->per_cu.cu;
21948 gdb_assert (sig_cu != NULL);
21949 gdb_assert (to_underlying (sig_type->type_offset_in_section) != 0);
21950 temp_die.sect_off = sig_type->type_offset_in_section;
21951 die = (struct die_info *) htab_find_with_hash (sig_cu->die_hash, &temp_die,
21952 to_underlying (temp_die.sect_off));
21955 /* For .gdb_index version 7 keep track of included TUs.
21956 http://sourceware.org/bugzilla/show_bug.cgi?id=15021. */
21957 if (dwarf2_per_objfile->index_table != NULL
21958 && dwarf2_per_objfile->index_table->version <= 7)
21960 VEC_safe_push (dwarf2_per_cu_ptr,
21961 (*ref_cu)->per_cu->imported_symtabs,
21972 /* Follow signatured type referenced by ATTR in SRC_DIE.
21973 On entry *REF_CU is the CU of SRC_DIE.
21974 On exit *REF_CU is the CU of the result.
21975 The result is the DIE of the type.
21976 If the referenced type cannot be found an error is thrown. */
21978 static struct die_info *
21979 follow_die_sig (struct die_info *src_die, const struct attribute *attr,
21980 struct dwarf2_cu **ref_cu)
21982 ULONGEST signature = DW_SIGNATURE (attr);
21983 struct signatured_type *sig_type;
21984 struct die_info *die;
21986 gdb_assert (attr->form == DW_FORM_ref_sig8);
21988 sig_type = lookup_signatured_type (*ref_cu, signature);
21989 /* sig_type will be NULL if the signatured type is missing from
21991 if (sig_type == NULL)
21993 error (_("Dwarf Error: Cannot find signatured DIE %s referenced"
21994 " from DIE at 0x%x [in module %s]"),
21995 hex_string (signature), to_underlying (src_die->sect_off),
21996 objfile_name ((*ref_cu)->objfile));
21999 die = follow_die_sig_1 (src_die, sig_type, ref_cu);
22002 dump_die_for_error (src_die);
22003 error (_("Dwarf Error: Problem reading signatured DIE %s referenced"
22004 " from DIE at 0x%x [in module %s]"),
22005 hex_string (signature), to_underlying (src_die->sect_off),
22006 objfile_name ((*ref_cu)->objfile));
22012 /* Get the type specified by SIGNATURE referenced in DIE/CU,
22013 reading in and processing the type unit if necessary. */
22015 static struct type *
22016 get_signatured_type (struct die_info *die, ULONGEST signature,
22017 struct dwarf2_cu *cu)
22019 struct signatured_type *sig_type;
22020 struct dwarf2_cu *type_cu;
22021 struct die_info *type_die;
22024 sig_type = lookup_signatured_type (cu, signature);
22025 /* sig_type will be NULL if the signatured type is missing from
22027 if (sig_type == NULL)
22029 complaint (&symfile_complaints,
22030 _("Dwarf Error: Cannot find signatured DIE %s referenced"
22031 " from DIE at 0x%x [in module %s]"),
22032 hex_string (signature), to_underlying (die->sect_off),
22033 objfile_name (dwarf2_per_objfile->objfile));
22034 return build_error_marker_type (cu, die);
22037 /* If we already know the type we're done. */
22038 if (sig_type->type != NULL)
22039 return sig_type->type;
22042 type_die = follow_die_sig_1 (die, sig_type, &type_cu);
22043 if (type_die != NULL)
22045 /* N.B. We need to call get_die_type to ensure only one type for this DIE
22046 is created. This is important, for example, because for c++ classes
22047 we need TYPE_NAME set which is only done by new_symbol. Blech. */
22048 type = read_type_die (type_die, type_cu);
22051 complaint (&symfile_complaints,
22052 _("Dwarf Error: Cannot build signatured type %s"
22053 " referenced from DIE at 0x%x [in module %s]"),
22054 hex_string (signature), to_underlying (die->sect_off),
22055 objfile_name (dwarf2_per_objfile->objfile));
22056 type = build_error_marker_type (cu, die);
22061 complaint (&symfile_complaints,
22062 _("Dwarf Error: Problem reading signatured DIE %s referenced"
22063 " from DIE at 0x%x [in module %s]"),
22064 hex_string (signature), to_underlying (die->sect_off),
22065 objfile_name (dwarf2_per_objfile->objfile));
22066 type = build_error_marker_type (cu, die);
22068 sig_type->type = type;
22073 /* Get the type specified by the DW_AT_signature ATTR in DIE/CU,
22074 reading in and processing the type unit if necessary. */
22076 static struct type *
22077 get_DW_AT_signature_type (struct die_info *die, const struct attribute *attr,
22078 struct dwarf2_cu *cu) /* ARI: editCase function */
22080 /* Yes, DW_AT_signature can use a non-ref_sig8 reference. */
22081 if (attr_form_is_ref (attr))
22083 struct dwarf2_cu *type_cu = cu;
22084 struct die_info *type_die = follow_die_ref (die, attr, &type_cu);
22086 return read_type_die (type_die, type_cu);
22088 else if (attr->form == DW_FORM_ref_sig8)
22090 return get_signatured_type (die, DW_SIGNATURE (attr), cu);
22094 complaint (&symfile_complaints,
22095 _("Dwarf Error: DW_AT_signature has bad form %s in DIE"
22096 " at 0x%x [in module %s]"),
22097 dwarf_form_name (attr->form), to_underlying (die->sect_off),
22098 objfile_name (dwarf2_per_objfile->objfile));
22099 return build_error_marker_type (cu, die);
22103 /* Load the DIEs associated with type unit PER_CU into memory. */
22106 load_full_type_unit (struct dwarf2_per_cu_data *per_cu)
22108 struct signatured_type *sig_type;
22110 /* Caller is responsible for ensuring type_unit_groups don't get here. */
22111 gdb_assert (! IS_TYPE_UNIT_GROUP (per_cu));
22113 /* We have the per_cu, but we need the signatured_type.
22114 Fortunately this is an easy translation. */
22115 gdb_assert (per_cu->is_debug_types);
22116 sig_type = (struct signatured_type *) per_cu;
22118 gdb_assert (per_cu->cu == NULL);
22120 read_signatured_type (sig_type);
22122 gdb_assert (per_cu->cu != NULL);
22125 /* die_reader_func for read_signatured_type.
22126 This is identical to load_full_comp_unit_reader,
22127 but is kept separate for now. */
22130 read_signatured_type_reader (const struct die_reader_specs *reader,
22131 const gdb_byte *info_ptr,
22132 struct die_info *comp_unit_die,
22136 struct dwarf2_cu *cu = reader->cu;
22138 gdb_assert (cu->die_hash == NULL);
22140 htab_create_alloc_ex (cu->header.length / 12,
22144 &cu->comp_unit_obstack,
22145 hashtab_obstack_allocate,
22146 dummy_obstack_deallocate);
22149 comp_unit_die->child = read_die_and_siblings (reader, info_ptr,
22150 &info_ptr, comp_unit_die);
22151 cu->dies = comp_unit_die;
22152 /* comp_unit_die is not stored in die_hash, no need. */
22154 /* We try not to read any attributes in this function, because not
22155 all CUs needed for references have been loaded yet, and symbol
22156 table processing isn't initialized. But we have to set the CU language,
22157 or we won't be able to build types correctly.
22158 Similarly, if we do not read the producer, we can not apply
22159 producer-specific interpretation. */
22160 prepare_one_comp_unit (cu, cu->dies, language_minimal);
22163 /* Read in a signatured type and build its CU and DIEs.
22164 If the type is a stub for the real type in a DWO file,
22165 read in the real type from the DWO file as well. */
22168 read_signatured_type (struct signatured_type *sig_type)
22170 struct dwarf2_per_cu_data *per_cu = &sig_type->per_cu;
22172 gdb_assert (per_cu->is_debug_types);
22173 gdb_assert (per_cu->cu == NULL);
22175 init_cutu_and_read_dies (per_cu, NULL, 0, 1,
22176 read_signatured_type_reader, NULL);
22177 sig_type->per_cu.tu_read = 1;
22180 /* Decode simple location descriptions.
22181 Given a pointer to a dwarf block that defines a location, compute
22182 the location and return the value.
22184 NOTE drow/2003-11-18: This function is called in two situations
22185 now: for the address of static or global variables (partial symbols
22186 only) and for offsets into structures which are expected to be
22187 (more or less) constant. The partial symbol case should go away,
22188 and only the constant case should remain. That will let this
22189 function complain more accurately. A few special modes are allowed
22190 without complaint for global variables (for instance, global
22191 register values and thread-local values).
22193 A location description containing no operations indicates that the
22194 object is optimized out. The return value is 0 for that case.
22195 FIXME drow/2003-11-16: No callers check for this case any more; soon all
22196 callers will only want a very basic result and this can become a
22199 Note that stack[0] is unused except as a default error return. */
22202 decode_locdesc (struct dwarf_block *blk, struct dwarf2_cu *cu)
22204 struct objfile *objfile = cu->objfile;
22206 size_t size = blk->size;
22207 const gdb_byte *data = blk->data;
22208 CORE_ADDR stack[64];
22210 unsigned int bytes_read, unsnd;
22216 stack[++stacki] = 0;
22255 stack[++stacki] = op - DW_OP_lit0;
22290 stack[++stacki] = op - DW_OP_reg0;
22292 dwarf2_complex_location_expr_complaint ();
22296 unsnd = read_unsigned_leb128 (NULL, (data + i), &bytes_read);
22298 stack[++stacki] = unsnd;
22300 dwarf2_complex_location_expr_complaint ();
22304 stack[++stacki] = read_address (objfile->obfd, &data[i],
22309 case DW_OP_const1u:
22310 stack[++stacki] = read_1_byte (objfile->obfd, &data[i]);
22314 case DW_OP_const1s:
22315 stack[++stacki] = read_1_signed_byte (objfile->obfd, &data[i]);
22319 case DW_OP_const2u:
22320 stack[++stacki] = read_2_bytes (objfile->obfd, &data[i]);
22324 case DW_OP_const2s:
22325 stack[++stacki] = read_2_signed_bytes (objfile->obfd, &data[i]);
22329 case DW_OP_const4u:
22330 stack[++stacki] = read_4_bytes (objfile->obfd, &data[i]);
22334 case DW_OP_const4s:
22335 stack[++stacki] = read_4_signed_bytes (objfile->obfd, &data[i]);
22339 case DW_OP_const8u:
22340 stack[++stacki] = read_8_bytes (objfile->obfd, &data[i]);
22345 stack[++stacki] = read_unsigned_leb128 (NULL, (data + i),
22351 stack[++stacki] = read_signed_leb128 (NULL, (data + i), &bytes_read);
22356 stack[stacki + 1] = stack[stacki];
22361 stack[stacki - 1] += stack[stacki];
22365 case DW_OP_plus_uconst:
22366 stack[stacki] += read_unsigned_leb128 (NULL, (data + i),
22372 stack[stacki - 1] -= stack[stacki];
22377 /* If we're not the last op, then we definitely can't encode
22378 this using GDB's address_class enum. This is valid for partial
22379 global symbols, although the variable's address will be bogus
22382 dwarf2_complex_location_expr_complaint ();
22385 case DW_OP_GNU_push_tls_address:
22386 case DW_OP_form_tls_address:
22387 /* The top of the stack has the offset from the beginning
22388 of the thread control block at which the variable is located. */
22389 /* Nothing should follow this operator, so the top of stack would
22391 /* This is valid for partial global symbols, but the variable's
22392 address will be bogus in the psymtab. Make it always at least
22393 non-zero to not look as a variable garbage collected by linker
22394 which have DW_OP_addr 0. */
22396 dwarf2_complex_location_expr_complaint ();
22400 case DW_OP_GNU_uninit:
22403 case DW_OP_GNU_addr_index:
22404 case DW_OP_GNU_const_index:
22405 stack[++stacki] = read_addr_index_from_leb128 (cu, &data[i],
22412 const char *name = get_DW_OP_name (op);
22415 complaint (&symfile_complaints, _("unsupported stack op: '%s'"),
22418 complaint (&symfile_complaints, _("unsupported stack op: '%02x'"),
22422 return (stack[stacki]);
22425 /* Enforce maximum stack depth of SIZE-1 to avoid writing
22426 outside of the allocated space. Also enforce minimum>0. */
22427 if (stacki >= ARRAY_SIZE (stack) - 1)
22429 complaint (&symfile_complaints,
22430 _("location description stack overflow"));
22436 complaint (&symfile_complaints,
22437 _("location description stack underflow"));
22441 return (stack[stacki]);
22444 /* memory allocation interface */
22446 static struct dwarf_block *
22447 dwarf_alloc_block (struct dwarf2_cu *cu)
22449 return XOBNEW (&cu->comp_unit_obstack, struct dwarf_block);
22452 static struct die_info *
22453 dwarf_alloc_die (struct dwarf2_cu *cu, int num_attrs)
22455 struct die_info *die;
22456 size_t size = sizeof (struct die_info);
22459 size += (num_attrs - 1) * sizeof (struct attribute);
22461 die = (struct die_info *) obstack_alloc (&cu->comp_unit_obstack, size);
22462 memset (die, 0, sizeof (struct die_info));
22467 /* Macro support. */
22469 /* Return file name relative to the compilation directory of file number I in
22470 *LH's file name table. The result is allocated using xmalloc; the caller is
22471 responsible for freeing it. */
22474 file_file_name (int file, struct line_header *lh)
22476 /* Is the file number a valid index into the line header's file name
22477 table? Remember that file numbers start with one, not zero. */
22478 if (1 <= file && file <= lh->file_names.size ())
22480 const file_entry &fe = lh->file_names[file - 1];
22482 if (!IS_ABSOLUTE_PATH (fe.name))
22484 const char *dir = fe.include_dir (lh);
22486 return concat (dir, SLASH_STRING, fe.name, (char *) NULL);
22488 return xstrdup (fe.name);
22492 /* The compiler produced a bogus file number. We can at least
22493 record the macro definitions made in the file, even if we
22494 won't be able to find the file by name. */
22495 char fake_name[80];
22497 xsnprintf (fake_name, sizeof (fake_name),
22498 "<bad macro file number %d>", file);
22500 complaint (&symfile_complaints,
22501 _("bad file number in macro information (%d)"),
22504 return xstrdup (fake_name);
22508 /* Return the full name of file number I in *LH's file name table.
22509 Use COMP_DIR as the name of the current directory of the
22510 compilation. The result is allocated using xmalloc; the caller is
22511 responsible for freeing it. */
22513 file_full_name (int file, struct line_header *lh, const char *comp_dir)
22515 /* Is the file number a valid index into the line header's file name
22516 table? Remember that file numbers start with one, not zero. */
22517 if (1 <= file && file <= lh->file_names.size ())
22519 char *relative = file_file_name (file, lh);
22521 if (IS_ABSOLUTE_PATH (relative) || comp_dir == NULL)
22523 return reconcat (relative, comp_dir, SLASH_STRING,
22524 relative, (char *) NULL);
22527 return file_file_name (file, lh);
22531 static struct macro_source_file *
22532 macro_start_file (int file, int line,
22533 struct macro_source_file *current_file,
22534 struct line_header *lh)
22536 /* File name relative to the compilation directory of this source file. */
22537 char *file_name = file_file_name (file, lh);
22539 if (! current_file)
22541 /* Note: We don't create a macro table for this compilation unit
22542 at all until we actually get a filename. */
22543 struct macro_table *macro_table = get_macro_table ();
22545 /* If we have no current file, then this must be the start_file
22546 directive for the compilation unit's main source file. */
22547 current_file = macro_set_main (macro_table, file_name);
22548 macro_define_special (macro_table);
22551 current_file = macro_include (current_file, line, file_name);
22555 return current_file;
22558 static const char *
22559 consume_improper_spaces (const char *p, const char *body)
22563 complaint (&symfile_complaints,
22564 _("macro definition contains spaces "
22565 "in formal argument list:\n`%s'"),
22577 parse_macro_definition (struct macro_source_file *file, int line,
22582 /* The body string takes one of two forms. For object-like macro
22583 definitions, it should be:
22585 <macro name> " " <definition>
22587 For function-like macro definitions, it should be:
22589 <macro name> "() " <definition>
22591 <macro name> "(" <arg name> ( "," <arg name> ) * ") " <definition>
22593 Spaces may appear only where explicitly indicated, and in the
22596 The Dwarf 2 spec says that an object-like macro's name is always
22597 followed by a space, but versions of GCC around March 2002 omit
22598 the space when the macro's definition is the empty string.
22600 The Dwarf 2 spec says that there should be no spaces between the
22601 formal arguments in a function-like macro's formal argument list,
22602 but versions of GCC around March 2002 include spaces after the
22606 /* Find the extent of the macro name. The macro name is terminated
22607 by either a space or null character (for an object-like macro) or
22608 an opening paren (for a function-like macro). */
22609 for (p = body; *p; p++)
22610 if (*p == ' ' || *p == '(')
22613 if (*p == ' ' || *p == '\0')
22615 /* It's an object-like macro. */
22616 int name_len = p - body;
22617 char *name = savestring (body, name_len);
22618 const char *replacement;
22621 replacement = body + name_len + 1;
22624 dwarf2_macro_malformed_definition_complaint (body);
22625 replacement = body + name_len;
22628 macro_define_object (file, line, name, replacement);
22632 else if (*p == '(')
22634 /* It's a function-like macro. */
22635 char *name = savestring (body, p - body);
22638 char **argv = XNEWVEC (char *, argv_size);
22642 p = consume_improper_spaces (p, body);
22644 /* Parse the formal argument list. */
22645 while (*p && *p != ')')
22647 /* Find the extent of the current argument name. */
22648 const char *arg_start = p;
22650 while (*p && *p != ',' && *p != ')' && *p != ' ')
22653 if (! *p || p == arg_start)
22654 dwarf2_macro_malformed_definition_complaint (body);
22657 /* Make sure argv has room for the new argument. */
22658 if (argc >= argv_size)
22661 argv = XRESIZEVEC (char *, argv, argv_size);
22664 argv[argc++] = savestring (arg_start, p - arg_start);
22667 p = consume_improper_spaces (p, body);
22669 /* Consume the comma, if present. */
22674 p = consume_improper_spaces (p, body);
22683 /* Perfectly formed definition, no complaints. */
22684 macro_define_function (file, line, name,
22685 argc, (const char **) argv,
22687 else if (*p == '\0')
22689 /* Complain, but do define it. */
22690 dwarf2_macro_malformed_definition_complaint (body);
22691 macro_define_function (file, line, name,
22692 argc, (const char **) argv,
22696 /* Just complain. */
22697 dwarf2_macro_malformed_definition_complaint (body);
22700 /* Just complain. */
22701 dwarf2_macro_malformed_definition_complaint (body);
22707 for (i = 0; i < argc; i++)
22713 dwarf2_macro_malformed_definition_complaint (body);
22716 /* Skip some bytes from BYTES according to the form given in FORM.
22717 Returns the new pointer. */
22719 static const gdb_byte *
22720 skip_form_bytes (bfd *abfd, const gdb_byte *bytes, const gdb_byte *buffer_end,
22721 enum dwarf_form form,
22722 unsigned int offset_size,
22723 struct dwarf2_section_info *section)
22725 unsigned int bytes_read;
22729 case DW_FORM_data1:
22734 case DW_FORM_data2:
22738 case DW_FORM_data4:
22742 case DW_FORM_data8:
22746 case DW_FORM_data16:
22750 case DW_FORM_string:
22751 read_direct_string (abfd, bytes, &bytes_read);
22752 bytes += bytes_read;
22755 case DW_FORM_sec_offset:
22757 case DW_FORM_GNU_strp_alt:
22758 bytes += offset_size;
22761 case DW_FORM_block:
22762 bytes += read_unsigned_leb128 (abfd, bytes, &bytes_read);
22763 bytes += bytes_read;
22766 case DW_FORM_block1:
22767 bytes += 1 + read_1_byte (abfd, bytes);
22769 case DW_FORM_block2:
22770 bytes += 2 + read_2_bytes (abfd, bytes);
22772 case DW_FORM_block4:
22773 bytes += 4 + read_4_bytes (abfd, bytes);
22776 case DW_FORM_sdata:
22777 case DW_FORM_udata:
22778 case DW_FORM_GNU_addr_index:
22779 case DW_FORM_GNU_str_index:
22780 bytes = gdb_skip_leb128 (bytes, buffer_end);
22783 dwarf2_section_buffer_overflow_complaint (section);
22788 case DW_FORM_implicit_const:
22794 complaint (&symfile_complaints,
22795 _("invalid form 0x%x in `%s'"),
22796 form, get_section_name (section));
22804 /* A helper for dwarf_decode_macros that handles skipping an unknown
22805 opcode. Returns an updated pointer to the macro data buffer; or,
22806 on error, issues a complaint and returns NULL. */
22808 static const gdb_byte *
22809 skip_unknown_opcode (unsigned int opcode,
22810 const gdb_byte **opcode_definitions,
22811 const gdb_byte *mac_ptr, const gdb_byte *mac_end,
22813 unsigned int offset_size,
22814 struct dwarf2_section_info *section)
22816 unsigned int bytes_read, i;
22818 const gdb_byte *defn;
22820 if (opcode_definitions[opcode] == NULL)
22822 complaint (&symfile_complaints,
22823 _("unrecognized DW_MACFINO opcode 0x%x"),
22828 defn = opcode_definitions[opcode];
22829 arg = read_unsigned_leb128 (abfd, defn, &bytes_read);
22830 defn += bytes_read;
22832 for (i = 0; i < arg; ++i)
22834 mac_ptr = skip_form_bytes (abfd, mac_ptr, mac_end,
22835 (enum dwarf_form) defn[i], offset_size,
22837 if (mac_ptr == NULL)
22839 /* skip_form_bytes already issued the complaint. */
22847 /* A helper function which parses the header of a macro section.
22848 If the macro section is the extended (for now called "GNU") type,
22849 then this updates *OFFSET_SIZE. Returns a pointer to just after
22850 the header, or issues a complaint and returns NULL on error. */
22852 static const gdb_byte *
22853 dwarf_parse_macro_header (const gdb_byte **opcode_definitions,
22855 const gdb_byte *mac_ptr,
22856 unsigned int *offset_size,
22857 int section_is_gnu)
22859 memset (opcode_definitions, 0, 256 * sizeof (gdb_byte *));
22861 if (section_is_gnu)
22863 unsigned int version, flags;
22865 version = read_2_bytes (abfd, mac_ptr);
22866 if (version != 4 && version != 5)
22868 complaint (&symfile_complaints,
22869 _("unrecognized version `%d' in .debug_macro section"),
22875 flags = read_1_byte (abfd, mac_ptr);
22877 *offset_size = (flags & 1) ? 8 : 4;
22879 if ((flags & 2) != 0)
22880 /* We don't need the line table offset. */
22881 mac_ptr += *offset_size;
22883 /* Vendor opcode descriptions. */
22884 if ((flags & 4) != 0)
22886 unsigned int i, count;
22888 count = read_1_byte (abfd, mac_ptr);
22890 for (i = 0; i < count; ++i)
22892 unsigned int opcode, bytes_read;
22895 opcode = read_1_byte (abfd, mac_ptr);
22897 opcode_definitions[opcode] = mac_ptr;
22898 arg = read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
22899 mac_ptr += bytes_read;
22908 /* A helper for dwarf_decode_macros that handles the GNU extensions,
22909 including DW_MACRO_import. */
22912 dwarf_decode_macro_bytes (bfd *abfd,
22913 const gdb_byte *mac_ptr, const gdb_byte *mac_end,
22914 struct macro_source_file *current_file,
22915 struct line_header *lh,
22916 struct dwarf2_section_info *section,
22917 int section_is_gnu, int section_is_dwz,
22918 unsigned int offset_size,
22919 htab_t include_hash)
22921 struct objfile *objfile = dwarf2_per_objfile->objfile;
22922 enum dwarf_macro_record_type macinfo_type;
22923 int at_commandline;
22924 const gdb_byte *opcode_definitions[256];
22926 mac_ptr = dwarf_parse_macro_header (opcode_definitions, abfd, mac_ptr,
22927 &offset_size, section_is_gnu);
22928 if (mac_ptr == NULL)
22930 /* We already issued a complaint. */
22934 /* Determines if GDB is still before first DW_MACINFO_start_file. If true
22935 GDB is still reading the definitions from command line. First
22936 DW_MACINFO_start_file will need to be ignored as it was already executed
22937 to create CURRENT_FILE for the main source holding also the command line
22938 definitions. On first met DW_MACINFO_start_file this flag is reset to
22939 normally execute all the remaining DW_MACINFO_start_file macinfos. */
22941 at_commandline = 1;
22945 /* Do we at least have room for a macinfo type byte? */
22946 if (mac_ptr >= mac_end)
22948 dwarf2_section_buffer_overflow_complaint (section);
22952 macinfo_type = (enum dwarf_macro_record_type) read_1_byte (abfd, mac_ptr);
22955 /* Note that we rely on the fact that the corresponding GNU and
22956 DWARF constants are the same. */
22957 switch (macinfo_type)
22959 /* A zero macinfo type indicates the end of the macro
22964 case DW_MACRO_define:
22965 case DW_MACRO_undef:
22966 case DW_MACRO_define_strp:
22967 case DW_MACRO_undef_strp:
22968 case DW_MACRO_define_sup:
22969 case DW_MACRO_undef_sup:
22971 unsigned int bytes_read;
22976 line = read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
22977 mac_ptr += bytes_read;
22979 if (macinfo_type == DW_MACRO_define
22980 || macinfo_type == DW_MACRO_undef)
22982 body = read_direct_string (abfd, mac_ptr, &bytes_read);
22983 mac_ptr += bytes_read;
22987 LONGEST str_offset;
22989 str_offset = read_offset_1 (abfd, mac_ptr, offset_size);
22990 mac_ptr += offset_size;
22992 if (macinfo_type == DW_MACRO_define_sup
22993 || macinfo_type == DW_MACRO_undef_sup
22996 struct dwz_file *dwz = dwarf2_get_dwz_file ();
22998 body = read_indirect_string_from_dwz (dwz, str_offset);
23001 body = read_indirect_string_at_offset (abfd, str_offset);
23004 is_define = (macinfo_type == DW_MACRO_define
23005 || macinfo_type == DW_MACRO_define_strp
23006 || macinfo_type == DW_MACRO_define_sup);
23007 if (! current_file)
23009 /* DWARF violation as no main source is present. */
23010 complaint (&symfile_complaints,
23011 _("debug info with no main source gives macro %s "
23013 is_define ? _("definition") : _("undefinition"),
23017 if ((line == 0 && !at_commandline)
23018 || (line != 0 && at_commandline))
23019 complaint (&symfile_complaints,
23020 _("debug info gives %s macro %s with %s line %d: %s"),
23021 at_commandline ? _("command-line") : _("in-file"),
23022 is_define ? _("definition") : _("undefinition"),
23023 line == 0 ? _("zero") : _("non-zero"), line, body);
23026 parse_macro_definition (current_file, line, body);
23029 gdb_assert (macinfo_type == DW_MACRO_undef
23030 || macinfo_type == DW_MACRO_undef_strp
23031 || macinfo_type == DW_MACRO_undef_sup);
23032 macro_undef (current_file, line, body);
23037 case DW_MACRO_start_file:
23039 unsigned int bytes_read;
23042 line = read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
23043 mac_ptr += bytes_read;
23044 file = read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
23045 mac_ptr += bytes_read;
23047 if ((line == 0 && !at_commandline)
23048 || (line != 0 && at_commandline))
23049 complaint (&symfile_complaints,
23050 _("debug info gives source %d included "
23051 "from %s at %s line %d"),
23052 file, at_commandline ? _("command-line") : _("file"),
23053 line == 0 ? _("zero") : _("non-zero"), line);
23055 if (at_commandline)
23057 /* This DW_MACRO_start_file was executed in the
23059 at_commandline = 0;
23062 current_file = macro_start_file (file, line, current_file, lh);
23066 case DW_MACRO_end_file:
23067 if (! current_file)
23068 complaint (&symfile_complaints,
23069 _("macro debug info has an unmatched "
23070 "`close_file' directive"));
23073 current_file = current_file->included_by;
23074 if (! current_file)
23076 enum dwarf_macro_record_type next_type;
23078 /* GCC circa March 2002 doesn't produce the zero
23079 type byte marking the end of the compilation
23080 unit. Complain if it's not there, but exit no
23083 /* Do we at least have room for a macinfo type byte? */
23084 if (mac_ptr >= mac_end)
23086 dwarf2_section_buffer_overflow_complaint (section);
23090 /* We don't increment mac_ptr here, so this is just
23093 = (enum dwarf_macro_record_type) read_1_byte (abfd,
23095 if (next_type != 0)
23096 complaint (&symfile_complaints,
23097 _("no terminating 0-type entry for "
23098 "macros in `.debug_macinfo' section"));
23105 case DW_MACRO_import:
23106 case DW_MACRO_import_sup:
23110 bfd *include_bfd = abfd;
23111 struct dwarf2_section_info *include_section = section;
23112 const gdb_byte *include_mac_end = mac_end;
23113 int is_dwz = section_is_dwz;
23114 const gdb_byte *new_mac_ptr;
23116 offset = read_offset_1 (abfd, mac_ptr, offset_size);
23117 mac_ptr += offset_size;
23119 if (macinfo_type == DW_MACRO_import_sup)
23121 struct dwz_file *dwz = dwarf2_get_dwz_file ();
23123 dwarf2_read_section (objfile, &dwz->macro);
23125 include_section = &dwz->macro;
23126 include_bfd = get_section_bfd_owner (include_section);
23127 include_mac_end = dwz->macro.buffer + dwz->macro.size;
23131 new_mac_ptr = include_section->buffer + offset;
23132 slot = htab_find_slot (include_hash, new_mac_ptr, INSERT);
23136 /* This has actually happened; see
23137 http://sourceware.org/bugzilla/show_bug.cgi?id=13568. */
23138 complaint (&symfile_complaints,
23139 _("recursive DW_MACRO_import in "
23140 ".debug_macro section"));
23144 *slot = (void *) new_mac_ptr;
23146 dwarf_decode_macro_bytes (include_bfd, new_mac_ptr,
23147 include_mac_end, current_file, lh,
23148 section, section_is_gnu, is_dwz,
23149 offset_size, include_hash);
23151 htab_remove_elt (include_hash, (void *) new_mac_ptr);
23156 case DW_MACINFO_vendor_ext:
23157 if (!section_is_gnu)
23159 unsigned int bytes_read;
23161 /* This reads the constant, but since we don't recognize
23162 any vendor extensions, we ignore it. */
23163 read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
23164 mac_ptr += bytes_read;
23165 read_direct_string (abfd, mac_ptr, &bytes_read);
23166 mac_ptr += bytes_read;
23168 /* We don't recognize any vendor extensions. */
23174 mac_ptr = skip_unknown_opcode (macinfo_type, opcode_definitions,
23175 mac_ptr, mac_end, abfd, offset_size,
23177 if (mac_ptr == NULL)
23181 } while (macinfo_type != 0);
23185 dwarf_decode_macros (struct dwarf2_cu *cu, unsigned int offset,
23186 int section_is_gnu)
23188 struct objfile *objfile = dwarf2_per_objfile->objfile;
23189 struct line_header *lh = cu->line_header;
23191 const gdb_byte *mac_ptr, *mac_end;
23192 struct macro_source_file *current_file = 0;
23193 enum dwarf_macro_record_type macinfo_type;
23194 unsigned int offset_size = cu->header.offset_size;
23195 const gdb_byte *opcode_definitions[256];
23197 struct dwarf2_section_info *section;
23198 const char *section_name;
23200 if (cu->dwo_unit != NULL)
23202 if (section_is_gnu)
23204 section = &cu->dwo_unit->dwo_file->sections.macro;
23205 section_name = ".debug_macro.dwo";
23209 section = &cu->dwo_unit->dwo_file->sections.macinfo;
23210 section_name = ".debug_macinfo.dwo";
23215 if (section_is_gnu)
23217 section = &dwarf2_per_objfile->macro;
23218 section_name = ".debug_macro";
23222 section = &dwarf2_per_objfile->macinfo;
23223 section_name = ".debug_macinfo";
23227 dwarf2_read_section (objfile, section);
23228 if (section->buffer == NULL)
23230 complaint (&symfile_complaints, _("missing %s section"), section_name);
23233 abfd = get_section_bfd_owner (section);
23235 /* First pass: Find the name of the base filename.
23236 This filename is needed in order to process all macros whose definition
23237 (or undefinition) comes from the command line. These macros are defined
23238 before the first DW_MACINFO_start_file entry, and yet still need to be
23239 associated to the base file.
23241 To determine the base file name, we scan the macro definitions until we
23242 reach the first DW_MACINFO_start_file entry. We then initialize
23243 CURRENT_FILE accordingly so that any macro definition found before the
23244 first DW_MACINFO_start_file can still be associated to the base file. */
23246 mac_ptr = section->buffer + offset;
23247 mac_end = section->buffer + section->size;
23249 mac_ptr = dwarf_parse_macro_header (opcode_definitions, abfd, mac_ptr,
23250 &offset_size, section_is_gnu);
23251 if (mac_ptr == NULL)
23253 /* We already issued a complaint. */
23259 /* Do we at least have room for a macinfo type byte? */
23260 if (mac_ptr >= mac_end)
23262 /* Complaint is printed during the second pass as GDB will probably
23263 stop the first pass earlier upon finding
23264 DW_MACINFO_start_file. */
23268 macinfo_type = (enum dwarf_macro_record_type) read_1_byte (abfd, mac_ptr);
23271 /* Note that we rely on the fact that the corresponding GNU and
23272 DWARF constants are the same. */
23273 switch (macinfo_type)
23275 /* A zero macinfo type indicates the end of the macro
23280 case DW_MACRO_define:
23281 case DW_MACRO_undef:
23282 /* Only skip the data by MAC_PTR. */
23284 unsigned int bytes_read;
23286 read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
23287 mac_ptr += bytes_read;
23288 read_direct_string (abfd, mac_ptr, &bytes_read);
23289 mac_ptr += bytes_read;
23293 case DW_MACRO_start_file:
23295 unsigned int bytes_read;
23298 line = read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
23299 mac_ptr += bytes_read;
23300 file = read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
23301 mac_ptr += bytes_read;
23303 current_file = macro_start_file (file, line, current_file, lh);
23307 case DW_MACRO_end_file:
23308 /* No data to skip by MAC_PTR. */
23311 case DW_MACRO_define_strp:
23312 case DW_MACRO_undef_strp:
23313 case DW_MACRO_define_sup:
23314 case DW_MACRO_undef_sup:
23316 unsigned int bytes_read;
23318 read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
23319 mac_ptr += bytes_read;
23320 mac_ptr += offset_size;
23324 case DW_MACRO_import:
23325 case DW_MACRO_import_sup:
23326 /* Note that, according to the spec, a transparent include
23327 chain cannot call DW_MACRO_start_file. So, we can just
23328 skip this opcode. */
23329 mac_ptr += offset_size;
23332 case DW_MACINFO_vendor_ext:
23333 /* Only skip the data by MAC_PTR. */
23334 if (!section_is_gnu)
23336 unsigned int bytes_read;
23338 read_unsigned_leb128 (abfd, mac_ptr, &bytes_read);
23339 mac_ptr += bytes_read;
23340 read_direct_string (abfd, mac_ptr, &bytes_read);
23341 mac_ptr += bytes_read;
23346 mac_ptr = skip_unknown_opcode (macinfo_type, opcode_definitions,
23347 mac_ptr, mac_end, abfd, offset_size,
23349 if (mac_ptr == NULL)
23353 } while (macinfo_type != 0 && current_file == NULL);
23355 /* Second pass: Process all entries.
23357 Use the AT_COMMAND_LINE flag to determine whether we are still processing
23358 command-line macro definitions/undefinitions. This flag is unset when we
23359 reach the first DW_MACINFO_start_file entry. */
23361 htab_up include_hash (htab_create_alloc (1, htab_hash_pointer,
23363 NULL, xcalloc, xfree));
23364 mac_ptr = section->buffer + offset;
23365 slot = htab_find_slot (include_hash.get (), mac_ptr, INSERT);
23366 *slot = (void *) mac_ptr;
23367 dwarf_decode_macro_bytes (abfd, mac_ptr, mac_end,
23368 current_file, lh, section,
23369 section_is_gnu, 0, offset_size,
23370 include_hash.get ());
23373 /* Check if the attribute's form is a DW_FORM_block*
23374 if so return true else false. */
23377 attr_form_is_block (const struct attribute *attr)
23379 return (attr == NULL ? 0 :
23380 attr->form == DW_FORM_block1
23381 || attr->form == DW_FORM_block2
23382 || attr->form == DW_FORM_block4
23383 || attr->form == DW_FORM_block
23384 || attr->form == DW_FORM_exprloc);
23387 /* Return non-zero if ATTR's value is a section offset --- classes
23388 lineptr, loclistptr, macptr or rangelistptr --- or zero, otherwise.
23389 You may use DW_UNSND (attr) to retrieve such offsets.
23391 Section 7.5.4, "Attribute Encodings", explains that no attribute
23392 may have a value that belongs to more than one of these classes; it
23393 would be ambiguous if we did, because we use the same forms for all
23397 attr_form_is_section_offset (const struct attribute *attr)
23399 return (attr->form == DW_FORM_data4
23400 || attr->form == DW_FORM_data8
23401 || attr->form == DW_FORM_sec_offset);
23404 /* Return non-zero if ATTR's value falls in the 'constant' class, or
23405 zero otherwise. When this function returns true, you can apply
23406 dwarf2_get_attr_constant_value to it.
23408 However, note that for some attributes you must check
23409 attr_form_is_section_offset before using this test. DW_FORM_data4
23410 and DW_FORM_data8 are members of both the constant class, and of
23411 the classes that contain offsets into other debug sections
23412 (lineptr, loclistptr, macptr or rangelistptr). The DWARF spec says
23413 that, if an attribute's can be either a constant or one of the
23414 section offset classes, DW_FORM_data4 and DW_FORM_data8 should be
23415 taken as section offsets, not constants.
23417 DW_FORM_data16 is not considered as dwarf2_get_attr_constant_value
23418 cannot handle that. */
23421 attr_form_is_constant (const struct attribute *attr)
23423 switch (attr->form)
23425 case DW_FORM_sdata:
23426 case DW_FORM_udata:
23427 case DW_FORM_data1:
23428 case DW_FORM_data2:
23429 case DW_FORM_data4:
23430 case DW_FORM_data8:
23431 case DW_FORM_implicit_const:
23439 /* DW_ADDR is always stored already as sect_offset; despite for the forms
23440 besides DW_FORM_ref_addr it is stored as cu_offset in the DWARF file. */
23443 attr_form_is_ref (const struct attribute *attr)
23445 switch (attr->form)
23447 case DW_FORM_ref_addr:
23452 case DW_FORM_ref_udata:
23453 case DW_FORM_GNU_ref_alt:
23460 /* Return the .debug_loc section to use for CU.
23461 For DWO files use .debug_loc.dwo. */
23463 static struct dwarf2_section_info *
23464 cu_debug_loc_section (struct dwarf2_cu *cu)
23468 struct dwo_sections *sections = &cu->dwo_unit->dwo_file->sections;
23470 return cu->header.version >= 5 ? §ions->loclists : §ions->loc;
23472 return (cu->header.version >= 5 ? &dwarf2_per_objfile->loclists
23473 : &dwarf2_per_objfile->loc);
23476 /* A helper function that fills in a dwarf2_loclist_baton. */
23479 fill_in_loclist_baton (struct dwarf2_cu *cu,
23480 struct dwarf2_loclist_baton *baton,
23481 const struct attribute *attr)
23483 struct dwarf2_section_info *section = cu_debug_loc_section (cu);
23485 dwarf2_read_section (dwarf2_per_objfile->objfile, section);
23487 baton->per_cu = cu->per_cu;
23488 gdb_assert (baton->per_cu);
23489 /* We don't know how long the location list is, but make sure we
23490 don't run off the edge of the section. */
23491 baton->size = section->size - DW_UNSND (attr);
23492 baton->data = section->buffer + DW_UNSND (attr);
23493 baton->base_address = cu->base_address;
23494 baton->from_dwo = cu->dwo_unit != NULL;
23498 dwarf2_symbol_mark_computed (const struct attribute *attr, struct symbol *sym,
23499 struct dwarf2_cu *cu, int is_block)
23501 struct objfile *objfile = dwarf2_per_objfile->objfile;
23502 struct dwarf2_section_info *section = cu_debug_loc_section (cu);
23504 if (attr_form_is_section_offset (attr)
23505 /* .debug_loc{,.dwo} may not exist at all, or the offset may be outside
23506 the section. If so, fall through to the complaint in the
23508 && DW_UNSND (attr) < dwarf2_section_size (objfile, section))
23510 struct dwarf2_loclist_baton *baton;
23512 baton = XOBNEW (&objfile->objfile_obstack, struct dwarf2_loclist_baton);
23514 fill_in_loclist_baton (cu, baton, attr);
23516 if (cu->base_known == 0)
23517 complaint (&symfile_complaints,
23518 _("Location list used without "
23519 "specifying the CU base address."));
23521 SYMBOL_ACLASS_INDEX (sym) = (is_block
23522 ? dwarf2_loclist_block_index
23523 : dwarf2_loclist_index);
23524 SYMBOL_LOCATION_BATON (sym) = baton;
23528 struct dwarf2_locexpr_baton *baton;
23530 baton = XOBNEW (&objfile->objfile_obstack, struct dwarf2_locexpr_baton);
23531 baton->per_cu = cu->per_cu;
23532 gdb_assert (baton->per_cu);
23534 if (attr_form_is_block (attr))
23536 /* Note that we're just copying the block's data pointer
23537 here, not the actual data. We're still pointing into the
23538 info_buffer for SYM's objfile; right now we never release
23539 that buffer, but when we do clean up properly this may
23541 baton->size = DW_BLOCK (attr)->size;
23542 baton->data = DW_BLOCK (attr)->data;
23546 dwarf2_invalid_attrib_class_complaint ("location description",
23547 SYMBOL_NATURAL_NAME (sym));
23551 SYMBOL_ACLASS_INDEX (sym) = (is_block
23552 ? dwarf2_locexpr_block_index
23553 : dwarf2_locexpr_index);
23554 SYMBOL_LOCATION_BATON (sym) = baton;
23558 /* Return the OBJFILE associated with the compilation unit CU. If CU
23559 came from a separate debuginfo file, then the master objfile is
23563 dwarf2_per_cu_objfile (struct dwarf2_per_cu_data *per_cu)
23565 struct objfile *objfile = per_cu->objfile;
23567 /* Return the master objfile, so that we can report and look up the
23568 correct file containing this variable. */
23569 if (objfile->separate_debug_objfile_backlink)
23570 objfile = objfile->separate_debug_objfile_backlink;
23575 /* Return comp_unit_head for PER_CU, either already available in PER_CU->CU
23576 (CU_HEADERP is unused in such case) or prepare a temporary copy at
23577 CU_HEADERP first. */
23579 static const struct comp_unit_head *
23580 per_cu_header_read_in (struct comp_unit_head *cu_headerp,
23581 struct dwarf2_per_cu_data *per_cu)
23583 const gdb_byte *info_ptr;
23586 return &per_cu->cu->header;
23588 info_ptr = per_cu->section->buffer + to_underlying (per_cu->sect_off);
23590 memset (cu_headerp, 0, sizeof (*cu_headerp));
23591 read_comp_unit_head (cu_headerp, info_ptr, per_cu->section,
23592 rcuh_kind::COMPILE);
23597 /* Return the address size given in the compilation unit header for CU. */
23600 dwarf2_per_cu_addr_size (struct dwarf2_per_cu_data *per_cu)
23602 struct comp_unit_head cu_header_local;
23603 const struct comp_unit_head *cu_headerp;
23605 cu_headerp = per_cu_header_read_in (&cu_header_local, per_cu);
23607 return cu_headerp->addr_size;
23610 /* Return the offset size given in the compilation unit header for CU. */
23613 dwarf2_per_cu_offset_size (struct dwarf2_per_cu_data *per_cu)
23615 struct comp_unit_head cu_header_local;
23616 const struct comp_unit_head *cu_headerp;
23618 cu_headerp = per_cu_header_read_in (&cu_header_local, per_cu);
23620 return cu_headerp->offset_size;
23623 /* See its dwarf2loc.h declaration. */
23626 dwarf2_per_cu_ref_addr_size (struct dwarf2_per_cu_data *per_cu)
23628 struct comp_unit_head cu_header_local;
23629 const struct comp_unit_head *cu_headerp;
23631 cu_headerp = per_cu_header_read_in (&cu_header_local, per_cu);
23633 if (cu_headerp->version == 2)
23634 return cu_headerp->addr_size;
23636 return cu_headerp->offset_size;
23639 /* Return the text offset of the CU. The returned offset comes from
23640 this CU's objfile. If this objfile came from a separate debuginfo
23641 file, then the offset may be different from the corresponding
23642 offset in the parent objfile. */
23645 dwarf2_per_cu_text_offset (struct dwarf2_per_cu_data *per_cu)
23647 struct objfile *objfile = per_cu->objfile;
23649 return ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
23652 /* Return DWARF version number of PER_CU. */
23655 dwarf2_version (struct dwarf2_per_cu_data *per_cu)
23657 return per_cu->dwarf_version;
23660 /* Locate the .debug_info compilation unit from CU's objfile which contains
23661 the DIE at OFFSET. Raises an error on failure. */
23663 static struct dwarf2_per_cu_data *
23664 dwarf2_find_containing_comp_unit (sect_offset sect_off,
23665 unsigned int offset_in_dwz,
23666 struct objfile *objfile)
23668 struct dwarf2_per_cu_data *this_cu;
23670 const sect_offset *cu_off;
23673 high = dwarf2_per_objfile->n_comp_units - 1;
23676 struct dwarf2_per_cu_data *mid_cu;
23677 int mid = low + (high - low) / 2;
23679 mid_cu = dwarf2_per_objfile->all_comp_units[mid];
23680 cu_off = &mid_cu->sect_off;
23681 if (mid_cu->is_dwz > offset_in_dwz
23682 || (mid_cu->is_dwz == offset_in_dwz && *cu_off >= sect_off))
23687 gdb_assert (low == high);
23688 this_cu = dwarf2_per_objfile->all_comp_units[low];
23689 cu_off = &this_cu->sect_off;
23690 if (this_cu->is_dwz != offset_in_dwz || *cu_off > sect_off)
23692 if (low == 0 || this_cu->is_dwz != offset_in_dwz)
23693 error (_("Dwarf Error: could not find partial DIE containing "
23694 "offset 0x%x [in module %s]"),
23695 to_underlying (sect_off), bfd_get_filename (objfile->obfd));
23697 gdb_assert (dwarf2_per_objfile->all_comp_units[low-1]->sect_off
23699 return dwarf2_per_objfile->all_comp_units[low-1];
23703 this_cu = dwarf2_per_objfile->all_comp_units[low];
23704 if (low == dwarf2_per_objfile->n_comp_units - 1
23705 && sect_off >= this_cu->sect_off + this_cu->length)
23706 error (_("invalid dwarf2 offset %u"), to_underlying (sect_off));
23707 gdb_assert (sect_off < this_cu->sect_off + this_cu->length);
23712 /* Initialize dwarf2_cu CU, owned by PER_CU. */
23715 init_one_comp_unit (struct dwarf2_cu *cu, struct dwarf2_per_cu_data *per_cu)
23717 memset (cu, 0, sizeof (*cu));
23719 cu->per_cu = per_cu;
23720 cu->objfile = per_cu->objfile;
23721 obstack_init (&cu->comp_unit_obstack);
23724 /* Initialize basic fields of dwarf_cu CU according to DIE COMP_UNIT_DIE. */
23727 prepare_one_comp_unit (struct dwarf2_cu *cu, struct die_info *comp_unit_die,
23728 enum language pretend_language)
23730 struct attribute *attr;
23732 /* Set the language we're debugging. */
23733 attr = dwarf2_attr (comp_unit_die, DW_AT_language, cu);
23735 set_cu_language (DW_UNSND (attr), cu);
23738 cu->language = pretend_language;
23739 cu->language_defn = language_def (cu->language);
23742 cu->producer = dwarf2_string_attr (comp_unit_die, DW_AT_producer, cu);
23745 /* Release one cached compilation unit, CU. We unlink it from the tree
23746 of compilation units, but we don't remove it from the read_in_chain;
23747 the caller is responsible for that.
23748 NOTE: DATA is a void * because this function is also used as a
23749 cleanup routine. */
23752 free_heap_comp_unit (void *data)
23754 struct dwarf2_cu *cu = (struct dwarf2_cu *) data;
23756 gdb_assert (cu->per_cu != NULL);
23757 cu->per_cu->cu = NULL;
23760 obstack_free (&cu->comp_unit_obstack, NULL);
23765 /* This cleanup function is passed the address of a dwarf2_cu on the stack
23766 when we're finished with it. We can't free the pointer itself, but be
23767 sure to unlink it from the cache. Also release any associated storage. */
23770 free_stack_comp_unit (void *data)
23772 struct dwarf2_cu *cu = (struct dwarf2_cu *) data;
23774 gdb_assert (cu->per_cu != NULL);
23775 cu->per_cu->cu = NULL;
23778 obstack_free (&cu->comp_unit_obstack, NULL);
23779 cu->partial_dies = NULL;
23782 /* Free all cached compilation units. */
23785 free_cached_comp_units (void *data)
23787 dwarf2_per_objfile->free_cached_comp_units ();
23790 /* Increase the age counter on each cached compilation unit, and free
23791 any that are too old. */
23794 age_cached_comp_units (void)
23796 struct dwarf2_per_cu_data *per_cu, **last_chain;
23798 dwarf2_clear_marks (dwarf2_per_objfile->read_in_chain);
23799 per_cu = dwarf2_per_objfile->read_in_chain;
23800 while (per_cu != NULL)
23802 per_cu->cu->last_used ++;
23803 if (per_cu->cu->last_used <= dwarf_max_cache_age)
23804 dwarf2_mark (per_cu->cu);
23805 per_cu = per_cu->cu->read_in_chain;
23808 per_cu = dwarf2_per_objfile->read_in_chain;
23809 last_chain = &dwarf2_per_objfile->read_in_chain;
23810 while (per_cu != NULL)
23812 struct dwarf2_per_cu_data *next_cu;
23814 next_cu = per_cu->cu->read_in_chain;
23816 if (!per_cu->cu->mark)
23818 free_heap_comp_unit (per_cu->cu);
23819 *last_chain = next_cu;
23822 last_chain = &per_cu->cu->read_in_chain;
23828 /* Remove a single compilation unit from the cache. */
23831 free_one_cached_comp_unit (struct dwarf2_per_cu_data *target_per_cu)
23833 struct dwarf2_per_cu_data *per_cu, **last_chain;
23835 per_cu = dwarf2_per_objfile->read_in_chain;
23836 last_chain = &dwarf2_per_objfile->read_in_chain;
23837 while (per_cu != NULL)
23839 struct dwarf2_per_cu_data *next_cu;
23841 next_cu = per_cu->cu->read_in_chain;
23843 if (per_cu == target_per_cu)
23845 free_heap_comp_unit (per_cu->cu);
23847 *last_chain = next_cu;
23851 last_chain = &per_cu->cu->read_in_chain;
23857 /* Release all extra memory associated with OBJFILE. */
23860 dwarf2_free_objfile (struct objfile *objfile)
23863 = (struct dwarf2_per_objfile *) objfile_data (objfile,
23864 dwarf2_objfile_data_key);
23866 if (dwarf2_per_objfile == NULL)
23869 dwarf2_per_objfile->~dwarf2_per_objfile ();
23872 /* A set of CU "per_cu" pointer, DIE offset, and GDB type pointer.
23873 We store these in a hash table separate from the DIEs, and preserve them
23874 when the DIEs are flushed out of cache.
23876 The CU "per_cu" pointer is needed because offset alone is not enough to
23877 uniquely identify the type. A file may have multiple .debug_types sections,
23878 or the type may come from a DWO file. Furthermore, while it's more logical
23879 to use per_cu->section+offset, with Fission the section with the data is in
23880 the DWO file but we don't know that section at the point we need it.
23881 We have to use something in dwarf2_per_cu_data (or the pointer to it)
23882 because we can enter the lookup routine, get_die_type_at_offset, from
23883 outside this file, and thus won't necessarily have PER_CU->cu.
23884 Fortunately, PER_CU is stable for the life of the objfile. */
23886 struct dwarf2_per_cu_offset_and_type
23888 const struct dwarf2_per_cu_data *per_cu;
23889 sect_offset sect_off;
23893 /* Hash function for a dwarf2_per_cu_offset_and_type. */
23896 per_cu_offset_and_type_hash (const void *item)
23898 const struct dwarf2_per_cu_offset_and_type *ofs
23899 = (const struct dwarf2_per_cu_offset_and_type *) item;
23901 return (uintptr_t) ofs->per_cu + to_underlying (ofs->sect_off);
23904 /* Equality function for a dwarf2_per_cu_offset_and_type. */
23907 per_cu_offset_and_type_eq (const void *item_lhs, const void *item_rhs)
23909 const struct dwarf2_per_cu_offset_and_type *ofs_lhs
23910 = (const struct dwarf2_per_cu_offset_and_type *) item_lhs;
23911 const struct dwarf2_per_cu_offset_and_type *ofs_rhs
23912 = (const struct dwarf2_per_cu_offset_and_type *) item_rhs;
23914 return (ofs_lhs->per_cu == ofs_rhs->per_cu
23915 && ofs_lhs->sect_off == ofs_rhs->sect_off);
23918 /* Set the type associated with DIE to TYPE. Save it in CU's hash
23919 table if necessary. For convenience, return TYPE.
23921 The DIEs reading must have careful ordering to:
23922 * Not cause infite loops trying to read in DIEs as a prerequisite for
23923 reading current DIE.
23924 * Not trying to dereference contents of still incompletely read in types
23925 while reading in other DIEs.
23926 * Enable referencing still incompletely read in types just by a pointer to
23927 the type without accessing its fields.
23929 Therefore caller should follow these rules:
23930 * Try to fetch any prerequisite types we may need to build this DIE type
23931 before building the type and calling set_die_type.
23932 * After building type call set_die_type for current DIE as soon as
23933 possible before fetching more types to complete the current type.
23934 * Make the type as complete as possible before fetching more types. */
23936 static struct type *
23937 set_die_type (struct die_info *die, struct type *type, struct dwarf2_cu *cu)
23939 struct dwarf2_per_cu_offset_and_type **slot, ofs;
23940 struct objfile *objfile = cu->objfile;
23941 struct attribute *attr;
23942 struct dynamic_prop prop;
23944 /* For Ada types, make sure that the gnat-specific data is always
23945 initialized (if not already set). There are a few types where
23946 we should not be doing so, because the type-specific area is
23947 already used to hold some other piece of info (eg: TYPE_CODE_FLT
23948 where the type-specific area is used to store the floatformat).
23949 But this is not a problem, because the gnat-specific information
23950 is actually not needed for these types. */
23951 if (need_gnat_info (cu)
23952 && TYPE_CODE (type) != TYPE_CODE_FUNC
23953 && TYPE_CODE (type) != TYPE_CODE_FLT
23954 && TYPE_CODE (type) != TYPE_CODE_METHODPTR
23955 && TYPE_CODE (type) != TYPE_CODE_MEMBERPTR
23956 && TYPE_CODE (type) != TYPE_CODE_METHOD
23957 && !HAVE_GNAT_AUX_INFO (type))
23958 INIT_GNAT_SPECIFIC (type);
23960 /* Read DW_AT_allocated and set in type. */
23961 attr = dwarf2_attr (die, DW_AT_allocated, cu);
23962 if (attr_form_is_block (attr))
23964 if (attr_to_dynamic_prop (attr, die, cu, &prop))
23965 add_dyn_prop (DYN_PROP_ALLOCATED, prop, type, objfile);
23967 else if (attr != NULL)
23969 complaint (&symfile_complaints,
23970 _("DW_AT_allocated has the wrong form (%s) at DIE 0x%x"),
23971 (attr != NULL ? dwarf_form_name (attr->form) : "n/a"),
23972 to_underlying (die->sect_off));
23975 /* Read DW_AT_associated and set in type. */
23976 attr = dwarf2_attr (die, DW_AT_associated, cu);
23977 if (attr_form_is_block (attr))
23979 if (attr_to_dynamic_prop (attr, die, cu, &prop))
23980 add_dyn_prop (DYN_PROP_ASSOCIATED, prop, type, objfile);
23982 else if (attr != NULL)
23984 complaint (&symfile_complaints,
23985 _("DW_AT_associated has the wrong form (%s) at DIE 0x%x"),
23986 (attr != NULL ? dwarf_form_name (attr->form) : "n/a"),
23987 to_underlying (die->sect_off));
23990 /* Read DW_AT_data_location and set in type. */
23991 attr = dwarf2_attr (die, DW_AT_data_location, cu);
23992 if (attr_to_dynamic_prop (attr, die, cu, &prop))
23993 add_dyn_prop (DYN_PROP_DATA_LOCATION, prop, type, objfile);
23995 if (dwarf2_per_objfile->die_type_hash == NULL)
23997 dwarf2_per_objfile->die_type_hash =
23998 htab_create_alloc_ex (127,
23999 per_cu_offset_and_type_hash,
24000 per_cu_offset_and_type_eq,
24002 &objfile->objfile_obstack,
24003 hashtab_obstack_allocate,
24004 dummy_obstack_deallocate);
24007 ofs.per_cu = cu->per_cu;
24008 ofs.sect_off = die->sect_off;
24010 slot = (struct dwarf2_per_cu_offset_and_type **)
24011 htab_find_slot (dwarf2_per_objfile->die_type_hash, &ofs, INSERT);
24013 complaint (&symfile_complaints,
24014 _("A problem internal to GDB: DIE 0x%x has type already set"),
24015 to_underlying (die->sect_off));
24016 *slot = XOBNEW (&objfile->objfile_obstack,
24017 struct dwarf2_per_cu_offset_and_type);
24022 /* Look up the type for the die at SECT_OFF in PER_CU in die_type_hash,
24023 or return NULL if the die does not have a saved type. */
24025 static struct type *
24026 get_die_type_at_offset (sect_offset sect_off,
24027 struct dwarf2_per_cu_data *per_cu)
24029 struct dwarf2_per_cu_offset_and_type *slot, ofs;
24031 if (dwarf2_per_objfile->die_type_hash == NULL)
24034 ofs.per_cu = per_cu;
24035 ofs.sect_off = sect_off;
24036 slot = ((struct dwarf2_per_cu_offset_and_type *)
24037 htab_find (dwarf2_per_objfile->die_type_hash, &ofs));
24044 /* Look up the type for DIE in CU in die_type_hash,
24045 or return NULL if DIE does not have a saved type. */
24047 static struct type *
24048 get_die_type (struct die_info *die, struct dwarf2_cu *cu)
24050 return get_die_type_at_offset (die->sect_off, cu->per_cu);
24053 /* Add a dependence relationship from CU to REF_PER_CU. */
24056 dwarf2_add_dependence (struct dwarf2_cu *cu,
24057 struct dwarf2_per_cu_data *ref_per_cu)
24061 if (cu->dependencies == NULL)
24063 = htab_create_alloc_ex (5, htab_hash_pointer, htab_eq_pointer,
24064 NULL, &cu->comp_unit_obstack,
24065 hashtab_obstack_allocate,
24066 dummy_obstack_deallocate);
24068 slot = htab_find_slot (cu->dependencies, ref_per_cu, INSERT);
24070 *slot = ref_per_cu;
24073 /* Subroutine of dwarf2_mark to pass to htab_traverse.
24074 Set the mark field in every compilation unit in the
24075 cache that we must keep because we are keeping CU. */
24078 dwarf2_mark_helper (void **slot, void *data)
24080 struct dwarf2_per_cu_data *per_cu;
24082 per_cu = (struct dwarf2_per_cu_data *) *slot;
24084 /* cu->dependencies references may not yet have been ever read if QUIT aborts
24085 reading of the chain. As such dependencies remain valid it is not much
24086 useful to track and undo them during QUIT cleanups. */
24087 if (per_cu->cu == NULL)
24090 if (per_cu->cu->mark)
24092 per_cu->cu->mark = 1;
24094 if (per_cu->cu->dependencies != NULL)
24095 htab_traverse (per_cu->cu->dependencies, dwarf2_mark_helper, NULL);
24100 /* Set the mark field in CU and in every other compilation unit in the
24101 cache that we must keep because we are keeping CU. */
24104 dwarf2_mark (struct dwarf2_cu *cu)
24109 if (cu->dependencies != NULL)
24110 htab_traverse (cu->dependencies, dwarf2_mark_helper, NULL);
24114 dwarf2_clear_marks (struct dwarf2_per_cu_data *per_cu)
24118 per_cu->cu->mark = 0;
24119 per_cu = per_cu->cu->read_in_chain;
24123 /* Trivial hash function for partial_die_info: the hash value of a DIE
24124 is its offset in .debug_info for this objfile. */
24127 partial_die_hash (const void *item)
24129 const struct partial_die_info *part_die
24130 = (const struct partial_die_info *) item;
24132 return to_underlying (part_die->sect_off);
24135 /* Trivial comparison function for partial_die_info structures: two DIEs
24136 are equal if they have the same offset. */
24139 partial_die_eq (const void *item_lhs, const void *item_rhs)
24141 const struct partial_die_info *part_die_lhs
24142 = (const struct partial_die_info *) item_lhs;
24143 const struct partial_die_info *part_die_rhs
24144 = (const struct partial_die_info *) item_rhs;
24146 return part_die_lhs->sect_off == part_die_rhs->sect_off;
24149 static struct cmd_list_element *set_dwarf_cmdlist;
24150 static struct cmd_list_element *show_dwarf_cmdlist;
24153 set_dwarf_cmd (const char *args, int from_tty)
24155 help_list (set_dwarf_cmdlist, "maintenance set dwarf ", all_commands,
24160 show_dwarf_cmd (const char *args, int from_tty)
24162 cmd_show_list (show_dwarf_cmdlist, from_tty, "");
24165 /* Free data associated with OBJFILE, if necessary. */
24168 dwarf2_per_objfile_free (struct objfile *objfile, void *d)
24170 struct dwarf2_per_objfile *data = (struct dwarf2_per_objfile *) d;
24173 /* Make sure we don't accidentally use dwarf2_per_objfile while
24175 dwarf2_per_objfile = NULL;
24177 for (ix = 0; ix < data->n_comp_units; ++ix)
24178 VEC_free (dwarf2_per_cu_ptr, data->all_comp_units[ix]->imported_symtabs);
24180 for (ix = 0; ix < data->n_type_units; ++ix)
24181 VEC_free (dwarf2_per_cu_ptr,
24182 data->all_type_units[ix]->per_cu.imported_symtabs);
24183 xfree (data->all_type_units);
24185 VEC_free (dwarf2_section_info_def, data->types);
24187 if (data->dwo_files)
24188 free_dwo_files (data->dwo_files, objfile);
24189 if (data->dwp_file)
24190 gdb_bfd_unref (data->dwp_file->dbfd);
24192 if (data->dwz_file && data->dwz_file->dwz_bfd)
24193 gdb_bfd_unref (data->dwz_file->dwz_bfd);
24195 if (data->index_table != NULL)
24196 data->index_table->~mapped_index ();
24200 /* The "save gdb-index" command. */
24202 /* In-memory buffer to prepare data to be written later to a file. */
24206 /* Copy DATA to the end of the buffer. */
24207 template<typename T>
24208 void append_data (const T &data)
24210 std::copy (reinterpret_cast<const gdb_byte *> (&data),
24211 reinterpret_cast<const gdb_byte *> (&data + 1),
24212 grow (sizeof (data)));
24215 /* Copy CSTR (a zero-terminated string) to the end of buffer. The
24216 terminating zero is appended too. */
24217 void append_cstr0 (const char *cstr)
24219 const size_t size = strlen (cstr) + 1;
24220 std::copy (cstr, cstr + size, grow (size));
24223 /* Accept a host-format integer in VAL and append it to the buffer
24224 as a target-format integer which is LEN bytes long. */
24225 void append_uint (size_t len, bfd_endian byte_order, ULONGEST val)
24227 ::store_unsigned_integer (grow (len), len, byte_order, val);
24230 /* Return the size of the buffer. */
24231 size_t size () const
24233 return m_vec.size ();
24236 /* Write the buffer to FILE. */
24237 void file_write (FILE *file) const
24239 if (::fwrite (m_vec.data (), 1, m_vec.size (), file) != m_vec.size ())
24240 error (_("couldn't write data to file"));
24244 /* Grow SIZE bytes at the end of the buffer. Returns a pointer to
24245 the start of the new block. */
24246 gdb_byte *grow (size_t size)
24248 m_vec.resize (m_vec.size () + size);
24249 return &*m_vec.end () - size;
24252 gdb::byte_vector m_vec;
24255 /* An entry in the symbol table. */
24256 struct symtab_index_entry
24258 /* The name of the symbol. */
24260 /* The offset of the name in the constant pool. */
24261 offset_type index_offset;
24262 /* A sorted vector of the indices of all the CUs that hold an object
24264 std::vector<offset_type> cu_indices;
24267 /* The symbol table. This is a power-of-2-sized hash table. */
24268 struct mapped_symtab
24272 data.resize (1024);
24275 offset_type n_elements = 0;
24276 std::vector<symtab_index_entry> data;
24279 /* Find a slot in SYMTAB for the symbol NAME. Returns a reference to
24282 Function is used only during write_hash_table so no index format backward
24283 compatibility is needed. */
24285 static symtab_index_entry &
24286 find_slot (struct mapped_symtab *symtab, const char *name)
24288 offset_type index, step, hash = mapped_index_string_hash (INT_MAX, name);
24290 index = hash & (symtab->data.size () - 1);
24291 step = ((hash * 17) & (symtab->data.size () - 1)) | 1;
24295 if (symtab->data[index].name == NULL
24296 || strcmp (name, symtab->data[index].name) == 0)
24297 return symtab->data[index];
24298 index = (index + step) & (symtab->data.size () - 1);
24302 /* Expand SYMTAB's hash table. */
24305 hash_expand (struct mapped_symtab *symtab)
24307 auto old_entries = std::move (symtab->data);
24309 symtab->data.clear ();
24310 symtab->data.resize (old_entries.size () * 2);
24312 for (auto &it : old_entries)
24313 if (it.name != NULL)
24315 auto &ref = find_slot (symtab, it.name);
24316 ref = std::move (it);
24320 /* Add an entry to SYMTAB. NAME is the name of the symbol.
24321 CU_INDEX is the index of the CU in which the symbol appears.
24322 IS_STATIC is one if the symbol is static, otherwise zero (global). */
24325 add_index_entry (struct mapped_symtab *symtab, const char *name,
24326 int is_static, gdb_index_symbol_kind kind,
24327 offset_type cu_index)
24329 offset_type cu_index_and_attrs;
24331 ++symtab->n_elements;
24332 if (4 * symtab->n_elements / 3 >= symtab->data.size ())
24333 hash_expand (symtab);
24335 symtab_index_entry &slot = find_slot (symtab, name);
24336 if (slot.name == NULL)
24339 /* index_offset is set later. */
24342 cu_index_and_attrs = 0;
24343 DW2_GDB_INDEX_CU_SET_VALUE (cu_index_and_attrs, cu_index);
24344 DW2_GDB_INDEX_SYMBOL_STATIC_SET_VALUE (cu_index_and_attrs, is_static);
24345 DW2_GDB_INDEX_SYMBOL_KIND_SET_VALUE (cu_index_and_attrs, kind);
24347 /* We don't want to record an index value twice as we want to avoid the
24349 We process all global symbols and then all static symbols
24350 (which would allow us to avoid the duplication by only having to check
24351 the last entry pushed), but a symbol could have multiple kinds in one CU.
24352 To keep things simple we don't worry about the duplication here and
24353 sort and uniqufy the list after we've processed all symbols. */
24354 slot.cu_indices.push_back (cu_index_and_attrs);
24357 /* Sort and remove duplicates of all symbols' cu_indices lists. */
24360 uniquify_cu_indices (struct mapped_symtab *symtab)
24362 for (auto &entry : symtab->data)
24364 if (entry.name != NULL && !entry.cu_indices.empty ())
24366 auto &cu_indices = entry.cu_indices;
24367 std::sort (cu_indices.begin (), cu_indices.end ());
24368 auto from = std::unique (cu_indices.begin (), cu_indices.end ());
24369 cu_indices.erase (from, cu_indices.end ());
24374 /* A form of 'const char *' suitable for container keys. Only the
24375 pointer is stored. The strings themselves are compared, not the
24380 c_str_view (const char *cstr)
24384 bool operator== (const c_str_view &other) const
24386 return strcmp (m_cstr, other.m_cstr) == 0;
24390 friend class c_str_view_hasher;
24391 const char *const m_cstr;
24394 /* A std::unordered_map::hasher for c_str_view that uses the right
24395 hash function for strings in a mapped index. */
24396 class c_str_view_hasher
24399 size_t operator () (const c_str_view &x) const
24401 return mapped_index_string_hash (INT_MAX, x.m_cstr);
24405 /* A std::unordered_map::hasher for std::vector<>. */
24406 template<typename T>
24407 class vector_hasher
24410 size_t operator () (const std::vector<T> &key) const
24412 return iterative_hash (key.data (),
24413 sizeof (key.front ()) * key.size (), 0);
24417 /* Write the mapped hash table SYMTAB to the data buffer OUTPUT, with
24418 constant pool entries going into the data buffer CPOOL. */
24421 write_hash_table (mapped_symtab *symtab, data_buf &output, data_buf &cpool)
24424 /* Elements are sorted vectors of the indices of all the CUs that
24425 hold an object of this name. */
24426 std::unordered_map<std::vector<offset_type>, offset_type,
24427 vector_hasher<offset_type>>
24430 /* We add all the index vectors to the constant pool first, to
24431 ensure alignment is ok. */
24432 for (symtab_index_entry &entry : symtab->data)
24434 if (entry.name == NULL)
24436 gdb_assert (entry.index_offset == 0);
24438 /* Finding before inserting is faster than always trying to
24439 insert, because inserting always allocates a node, does the
24440 lookup, and then destroys the new node if another node
24441 already had the same key. C++17 try_emplace will avoid
24444 = symbol_hash_table.find (entry.cu_indices);
24445 if (found != symbol_hash_table.end ())
24447 entry.index_offset = found->second;
24451 symbol_hash_table.emplace (entry.cu_indices, cpool.size ());
24452 entry.index_offset = cpool.size ();
24453 cpool.append_data (MAYBE_SWAP (entry.cu_indices.size ()));
24454 for (const auto index : entry.cu_indices)
24455 cpool.append_data (MAYBE_SWAP (index));
24459 /* Now write out the hash table. */
24460 std::unordered_map<c_str_view, offset_type, c_str_view_hasher> str_table;
24461 for (const auto &entry : symtab->data)
24463 offset_type str_off, vec_off;
24465 if (entry.name != NULL)
24467 const auto insertpair = str_table.emplace (entry.name, cpool.size ());
24468 if (insertpair.second)
24469 cpool.append_cstr0 (entry.name);
24470 str_off = insertpair.first->second;
24471 vec_off = entry.index_offset;
24475 /* While 0 is a valid constant pool index, it is not valid
24476 to have 0 for both offsets. */
24481 output.append_data (MAYBE_SWAP (str_off));
24482 output.append_data (MAYBE_SWAP (vec_off));
24486 typedef std::unordered_map<partial_symtab *, unsigned int> psym_index_map;
24488 /* Helper struct for building the address table. */
24489 struct addrmap_index_data
24491 addrmap_index_data (data_buf &addr_vec_, psym_index_map &cu_index_htab_)
24492 : addr_vec (addr_vec_), cu_index_htab (cu_index_htab_)
24495 struct objfile *objfile;
24496 data_buf &addr_vec;
24497 psym_index_map &cu_index_htab;
24499 /* Non-zero if the previous_* fields are valid.
24500 We can't write an entry until we see the next entry (since it is only then
24501 that we know the end of the entry). */
24502 int previous_valid;
24503 /* Index of the CU in the table of all CUs in the index file. */
24504 unsigned int previous_cu_index;
24505 /* Start address of the CU. */
24506 CORE_ADDR previous_cu_start;
24509 /* Write an address entry to ADDR_VEC. */
24512 add_address_entry (struct objfile *objfile, data_buf &addr_vec,
24513 CORE_ADDR start, CORE_ADDR end, unsigned int cu_index)
24515 CORE_ADDR baseaddr;
24517 baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
24519 addr_vec.append_uint (8, BFD_ENDIAN_LITTLE, start - baseaddr);
24520 addr_vec.append_uint (8, BFD_ENDIAN_LITTLE, end - baseaddr);
24521 addr_vec.append_data (MAYBE_SWAP (cu_index));
24524 /* Worker function for traversing an addrmap to build the address table. */
24527 add_address_entry_worker (void *datap, CORE_ADDR start_addr, void *obj)
24529 struct addrmap_index_data *data = (struct addrmap_index_data *) datap;
24530 struct partial_symtab *pst = (struct partial_symtab *) obj;
24532 if (data->previous_valid)
24533 add_address_entry (data->objfile, data->addr_vec,
24534 data->previous_cu_start, start_addr,
24535 data->previous_cu_index);
24537 data->previous_cu_start = start_addr;
24540 const auto it = data->cu_index_htab.find (pst);
24541 gdb_assert (it != data->cu_index_htab.cend ());
24542 data->previous_cu_index = it->second;
24543 data->previous_valid = 1;
24546 data->previous_valid = 0;
24551 /* Write OBJFILE's address map to ADDR_VEC.
24552 CU_INDEX_HTAB is used to map addrmap entries to their CU indices
24553 in the index file. */
24556 write_address_map (struct objfile *objfile, data_buf &addr_vec,
24557 psym_index_map &cu_index_htab)
24559 struct addrmap_index_data addrmap_index_data (addr_vec, cu_index_htab);
24561 /* When writing the address table, we have to cope with the fact that
24562 the addrmap iterator only provides the start of a region; we have to
24563 wait until the next invocation to get the start of the next region. */
24565 addrmap_index_data.objfile = objfile;
24566 addrmap_index_data.previous_valid = 0;
24568 addrmap_foreach (objfile->psymtabs_addrmap, add_address_entry_worker,
24569 &addrmap_index_data);
24571 /* It's highly unlikely the last entry (end address = 0xff...ff)
24572 is valid, but we should still handle it.
24573 The end address is recorded as the start of the next region, but that
24574 doesn't work here. To cope we pass 0xff...ff, this is a rare situation
24576 if (addrmap_index_data.previous_valid)
24577 add_address_entry (objfile, addr_vec,
24578 addrmap_index_data.previous_cu_start, (CORE_ADDR) -1,
24579 addrmap_index_data.previous_cu_index);
24582 /* Return the symbol kind of PSYM. */
24584 static gdb_index_symbol_kind
24585 symbol_kind (struct partial_symbol *psym)
24587 domain_enum domain = PSYMBOL_DOMAIN (psym);
24588 enum address_class aclass = PSYMBOL_CLASS (psym);
24596 return GDB_INDEX_SYMBOL_KIND_FUNCTION;
24598 return GDB_INDEX_SYMBOL_KIND_TYPE;
24600 case LOC_CONST_BYTES:
24601 case LOC_OPTIMIZED_OUT:
24603 return GDB_INDEX_SYMBOL_KIND_VARIABLE;
24605 /* Note: It's currently impossible to recognize psyms as enum values
24606 short of reading the type info. For now punt. */
24607 return GDB_INDEX_SYMBOL_KIND_VARIABLE;
24609 /* There are other LOC_FOO values that one might want to classify
24610 as variables, but dwarf2read.c doesn't currently use them. */
24611 return GDB_INDEX_SYMBOL_KIND_OTHER;
24613 case STRUCT_DOMAIN:
24614 return GDB_INDEX_SYMBOL_KIND_TYPE;
24616 return GDB_INDEX_SYMBOL_KIND_OTHER;
24620 /* Add a list of partial symbols to SYMTAB. */
24623 write_psymbols (struct mapped_symtab *symtab,
24624 std::unordered_set<partial_symbol *> &psyms_seen,
24625 struct partial_symbol **psymp,
24627 offset_type cu_index,
24630 for (; count-- > 0; ++psymp)
24632 struct partial_symbol *psym = *psymp;
24634 if (SYMBOL_LANGUAGE (psym) == language_ada)
24635 error (_("Ada is not currently supported by the index"));
24637 /* Only add a given psymbol once. */
24638 if (psyms_seen.insert (psym).second)
24640 gdb_index_symbol_kind kind = symbol_kind (psym);
24642 add_index_entry (symtab, SYMBOL_SEARCH_NAME (psym),
24643 is_static, kind, cu_index);
24648 /* A helper struct used when iterating over debug_types. */
24649 struct signatured_type_index_data
24651 signatured_type_index_data (data_buf &types_list_,
24652 std::unordered_set<partial_symbol *> &psyms_seen_)
24653 : types_list (types_list_), psyms_seen (psyms_seen_)
24656 struct objfile *objfile;
24657 struct mapped_symtab *symtab;
24658 data_buf &types_list;
24659 std::unordered_set<partial_symbol *> &psyms_seen;
24663 /* A helper function that writes a single signatured_type to an
24667 write_one_signatured_type (void **slot, void *d)
24669 struct signatured_type_index_data *info
24670 = (struct signatured_type_index_data *) d;
24671 struct signatured_type *entry = (struct signatured_type *) *slot;
24672 struct partial_symtab *psymtab = entry->per_cu.v.psymtab;
24674 write_psymbols (info->symtab,
24676 &info->objfile->global_psymbols[psymtab->globals_offset],
24677 psymtab->n_global_syms, info->cu_index,
24679 write_psymbols (info->symtab,
24681 &info->objfile->static_psymbols[psymtab->statics_offset],
24682 psymtab->n_static_syms, info->cu_index,
24685 info->types_list.append_uint (8, BFD_ENDIAN_LITTLE,
24686 to_underlying (entry->per_cu.sect_off));
24687 info->types_list.append_uint (8, BFD_ENDIAN_LITTLE,
24688 to_underlying (entry->type_offset_in_tu));
24689 info->types_list.append_uint (8, BFD_ENDIAN_LITTLE, entry->signature);
24696 /* Recurse into all "included" dependencies and count their symbols as
24697 if they appeared in this psymtab. */
24700 recursively_count_psymbols (struct partial_symtab *psymtab,
24701 size_t &psyms_seen)
24703 for (int i = 0; i < psymtab->number_of_dependencies; ++i)
24704 if (psymtab->dependencies[i]->user != NULL)
24705 recursively_count_psymbols (psymtab->dependencies[i],
24708 psyms_seen += psymtab->n_global_syms;
24709 psyms_seen += psymtab->n_static_syms;
24712 /* Recurse into all "included" dependencies and write their symbols as
24713 if they appeared in this psymtab. */
24716 recursively_write_psymbols (struct objfile *objfile,
24717 struct partial_symtab *psymtab,
24718 struct mapped_symtab *symtab,
24719 std::unordered_set<partial_symbol *> &psyms_seen,
24720 offset_type cu_index)
24724 for (i = 0; i < psymtab->number_of_dependencies; ++i)
24725 if (psymtab->dependencies[i]->user != NULL)
24726 recursively_write_psymbols (objfile, psymtab->dependencies[i],
24727 symtab, psyms_seen, cu_index);
24729 write_psymbols (symtab,
24731 &objfile->global_psymbols[psymtab->globals_offset],
24732 psymtab->n_global_syms, cu_index,
24734 write_psymbols (symtab,
24736 &objfile->static_psymbols[psymtab->statics_offset],
24737 psymtab->n_static_syms, cu_index,
24741 /* Create an index file for OBJFILE in the directory DIR. */
24744 write_psymtabs_to_index (struct objfile *objfile, const char *dir)
24746 if (dwarf2_per_objfile->using_index)
24747 error (_("Cannot use an index to create the index"));
24749 if (VEC_length (dwarf2_section_info_def, dwarf2_per_objfile->types) > 1)
24750 error (_("Cannot make an index when the file has multiple .debug_types sections"));
24752 if (!objfile->psymtabs || !objfile->psymtabs_addrmap)
24756 if (stat (objfile_name (objfile), &st) < 0)
24757 perror_with_name (objfile_name (objfile));
24759 std::string filename (std::string (dir) + SLASH_STRING
24760 + lbasename (objfile_name (objfile)) + INDEX_SUFFIX);
24762 FILE *out_file = gdb_fopen_cloexec (filename.c_str (), "wb").release ();
24764 error (_("Can't open `%s' for writing"), filename.c_str ());
24766 /* Order matters here; we want FILE to be closed before FILENAME is
24767 unlinked, because on MS-Windows one cannot delete a file that is
24768 still open. (Don't call anything here that might throw until
24769 file_closer is created.) */
24770 gdb::unlinker unlink_file (filename.c_str ());
24771 gdb_file_up close_out_file (out_file);
24773 mapped_symtab symtab;
24776 /* While we're scanning CU's create a table that maps a psymtab pointer
24777 (which is what addrmap records) to its index (which is what is recorded
24778 in the index file). This will later be needed to write the address
24780 psym_index_map cu_index_htab;
24781 cu_index_htab.reserve (dwarf2_per_objfile->n_comp_units);
24783 /* The CU list is already sorted, so we don't need to do additional
24784 work here. Also, the debug_types entries do not appear in
24785 all_comp_units, but only in their own hash table. */
24787 /* The psyms_seen set is potentially going to be largish (~40k
24788 elements when indexing a -g3 build of GDB itself). Estimate the
24789 number of elements in order to avoid too many rehashes, which
24790 require rebuilding buckets and thus many trips to
24792 size_t psyms_count = 0;
24793 for (int i = 0; i < dwarf2_per_objfile->n_comp_units; ++i)
24795 struct dwarf2_per_cu_data *per_cu
24796 = dwarf2_per_objfile->all_comp_units[i];
24797 struct partial_symtab *psymtab = per_cu->v.psymtab;
24799 if (psymtab != NULL && psymtab->user == NULL)
24800 recursively_count_psymbols (psymtab, psyms_count);
24802 /* Generating an index for gdb itself shows a ratio of
24803 TOTAL_SEEN_SYMS/UNIQUE_SYMS or ~5. 4 seems like a good bet. */
24804 std::unordered_set<partial_symbol *> psyms_seen (psyms_count / 4);
24805 for (int i = 0; i < dwarf2_per_objfile->n_comp_units; ++i)
24807 struct dwarf2_per_cu_data *per_cu
24808 = dwarf2_per_objfile->all_comp_units[i];
24809 struct partial_symtab *psymtab = per_cu->v.psymtab;
24811 /* CU of a shared file from 'dwz -m' may be unused by this main file.
24812 It may be referenced from a local scope but in such case it does not
24813 need to be present in .gdb_index. */
24814 if (psymtab == NULL)
24817 if (psymtab->user == NULL)
24818 recursively_write_psymbols (objfile, psymtab, &symtab,
24821 const auto insertpair = cu_index_htab.emplace (psymtab, i);
24822 gdb_assert (insertpair.second);
24824 cu_list.append_uint (8, BFD_ENDIAN_LITTLE,
24825 to_underlying (per_cu->sect_off));
24826 cu_list.append_uint (8, BFD_ENDIAN_LITTLE, per_cu->length);
24829 /* Dump the address map. */
24831 write_address_map (objfile, addr_vec, cu_index_htab);
24833 /* Write out the .debug_type entries, if any. */
24834 data_buf types_cu_list;
24835 if (dwarf2_per_objfile->signatured_types)
24837 signatured_type_index_data sig_data (types_cu_list,
24840 sig_data.objfile = objfile;
24841 sig_data.symtab = &symtab;
24842 sig_data.cu_index = dwarf2_per_objfile->n_comp_units;
24843 htab_traverse_noresize (dwarf2_per_objfile->signatured_types,
24844 write_one_signatured_type, &sig_data);
24847 /* Now that we've processed all symbols we can shrink their cu_indices
24849 uniquify_cu_indices (&symtab);
24851 data_buf symtab_vec, constant_pool;
24852 write_hash_table (&symtab, symtab_vec, constant_pool);
24855 const offset_type size_of_contents = 6 * sizeof (offset_type);
24856 offset_type total_len = size_of_contents;
24858 /* The version number. */
24859 contents.append_data (MAYBE_SWAP (8));
24861 /* The offset of the CU list from the start of the file. */
24862 contents.append_data (MAYBE_SWAP (total_len));
24863 total_len += cu_list.size ();
24865 /* The offset of the types CU list from the start of the file. */
24866 contents.append_data (MAYBE_SWAP (total_len));
24867 total_len += types_cu_list.size ();
24869 /* The offset of the address table from the start of the file. */
24870 contents.append_data (MAYBE_SWAP (total_len));
24871 total_len += addr_vec.size ();
24873 /* The offset of the symbol table from the start of the file. */
24874 contents.append_data (MAYBE_SWAP (total_len));
24875 total_len += symtab_vec.size ();
24877 /* The offset of the constant pool from the start of the file. */
24878 contents.append_data (MAYBE_SWAP (total_len));
24879 total_len += constant_pool.size ();
24881 gdb_assert (contents.size () == size_of_contents);
24883 contents.file_write (out_file);
24884 cu_list.file_write (out_file);
24885 types_cu_list.file_write (out_file);
24886 addr_vec.file_write (out_file);
24887 symtab_vec.file_write (out_file);
24888 constant_pool.file_write (out_file);
24890 /* We want to keep the file. */
24891 unlink_file.keep ();
24894 /* Implementation of the `save gdb-index' command.
24896 Note that the file format used by this command is documented in the
24897 GDB manual. Any changes here must be documented there. */
24900 save_gdb_index_command (const char *arg, int from_tty)
24902 struct objfile *objfile;
24905 error (_("usage: save gdb-index DIRECTORY"));
24907 ALL_OBJFILES (objfile)
24911 /* If the objfile does not correspond to an actual file, skip it. */
24912 if (stat (objfile_name (objfile), &st) < 0)
24916 = (struct dwarf2_per_objfile *) objfile_data (objfile,
24917 dwarf2_objfile_data_key);
24918 if (dwarf2_per_objfile)
24923 write_psymtabs_to_index (objfile, arg);
24925 CATCH (except, RETURN_MASK_ERROR)
24927 exception_fprintf (gdb_stderr, except,
24928 _("Error while writing index for `%s': "),
24929 objfile_name (objfile));
24938 int dwarf_always_disassemble;
24941 show_dwarf_always_disassemble (struct ui_file *file, int from_tty,
24942 struct cmd_list_element *c, const char *value)
24944 fprintf_filtered (file,
24945 _("Whether to always disassemble "
24946 "DWARF expressions is %s.\n"),
24951 show_check_physname (struct ui_file *file, int from_tty,
24952 struct cmd_list_element *c, const char *value)
24954 fprintf_filtered (file,
24955 _("Whether to check \"physname\" is %s.\n"),
24960 _initialize_dwarf2_read (void)
24962 struct cmd_list_element *c;
24964 dwarf2_objfile_data_key
24965 = register_objfile_data_with_cleanup (NULL, dwarf2_per_objfile_free);
24967 add_prefix_cmd ("dwarf", class_maintenance, set_dwarf_cmd, _("\
24968 Set DWARF specific variables.\n\
24969 Configure DWARF variables such as the cache size"),
24970 &set_dwarf_cmdlist, "maintenance set dwarf ",
24971 0/*allow-unknown*/, &maintenance_set_cmdlist);
24973 add_prefix_cmd ("dwarf", class_maintenance, show_dwarf_cmd, _("\
24974 Show DWARF specific variables\n\
24975 Show DWARF variables such as the cache size"),
24976 &show_dwarf_cmdlist, "maintenance show dwarf ",
24977 0/*allow-unknown*/, &maintenance_show_cmdlist);
24979 add_setshow_zinteger_cmd ("max-cache-age", class_obscure,
24980 &dwarf_max_cache_age, _("\
24981 Set the upper bound on the age of cached DWARF compilation units."), _("\
24982 Show the upper bound on the age of cached DWARF compilation units."), _("\
24983 A higher limit means that cached compilation units will be stored\n\
24984 in memory longer, and more total memory will be used. Zero disables\n\
24985 caching, which can slow down startup."),
24987 show_dwarf_max_cache_age,
24988 &set_dwarf_cmdlist,
24989 &show_dwarf_cmdlist);
24991 add_setshow_boolean_cmd ("always-disassemble", class_obscure,
24992 &dwarf_always_disassemble, _("\
24993 Set whether `info address' always disassembles DWARF expressions."), _("\
24994 Show whether `info address' always disassembles DWARF expressions."), _("\
24995 When enabled, DWARF expressions are always printed in an assembly-like\n\
24996 syntax. When disabled, expressions will be printed in a more\n\
24997 conversational style, when possible."),
24999 show_dwarf_always_disassemble,
25000 &set_dwarf_cmdlist,
25001 &show_dwarf_cmdlist);
25003 add_setshow_zuinteger_cmd ("dwarf-read", no_class, &dwarf_read_debug, _("\
25004 Set debugging of the DWARF reader."), _("\
25005 Show debugging of the DWARF reader."), _("\
25006 When enabled (non-zero), debugging messages are printed during DWARF\n\
25007 reading and symtab expansion. A value of 1 (one) provides basic\n\
25008 information. A value greater than 1 provides more verbose information."),
25011 &setdebuglist, &showdebuglist);
25013 add_setshow_zuinteger_cmd ("dwarf-die", no_class, &dwarf_die_debug, _("\
25014 Set debugging of the DWARF DIE reader."), _("\
25015 Show debugging of the DWARF DIE reader."), _("\
25016 When enabled (non-zero), DIEs are dumped after they are read in.\n\
25017 The value is the maximum depth to print."),
25020 &setdebuglist, &showdebuglist);
25022 add_setshow_zuinteger_cmd ("dwarf-line", no_class, &dwarf_line_debug, _("\
25023 Set debugging of the dwarf line reader."), _("\
25024 Show debugging of the dwarf line reader."), _("\
25025 When enabled (non-zero), line number entries are dumped as they are read in.\n\
25026 A value of 1 (one) provides basic information.\n\
25027 A value greater than 1 provides more verbose information."),
25030 &setdebuglist, &showdebuglist);
25032 add_setshow_boolean_cmd ("check-physname", no_class, &check_physname, _("\
25033 Set cross-checking of \"physname\" code against demangler."), _("\
25034 Show cross-checking of \"physname\" code against demangler."), _("\
25035 When enabled, GDB's internal \"physname\" code is checked against\n\
25037 NULL, show_check_physname,
25038 &setdebuglist, &showdebuglist);
25040 add_setshow_boolean_cmd ("use-deprecated-index-sections",
25041 no_class, &use_deprecated_index_sections, _("\
25042 Set whether to use deprecated gdb_index sections."), _("\
25043 Show whether to use deprecated gdb_index sections."), _("\
25044 When enabled, deprecated .gdb_index sections are used anyway.\n\
25045 Normally they are ignored either because of a missing feature or\n\
25046 performance issue.\n\
25047 Warning: This option must be enabled before gdb reads the file."),
25050 &setlist, &showlist);
25052 c = add_cmd ("gdb-index", class_files, save_gdb_index_command,
25054 Save a gdb-index file.\n\
25055 Usage: save gdb-index DIRECTORY"),
25057 set_cmd_completer (c, filename_completer);
25059 dwarf2_locexpr_index = register_symbol_computed_impl (LOC_COMPUTED,
25060 &dwarf2_locexpr_funcs);
25061 dwarf2_loclist_index = register_symbol_computed_impl (LOC_COMPUTED,
25062 &dwarf2_loclist_funcs);
25064 dwarf2_locexpr_block_index = register_symbol_block_impl (LOC_BLOCK,
25065 &dwarf2_block_frame_base_locexpr_funcs);
25066 dwarf2_loclist_block_index = register_symbol_block_impl (LOC_BLOCK,
25067 &dwarf2_block_frame_base_loclist_funcs);
25070 selftests::register_test ("dw2_expand_symtabs_matching",
25071 selftests::dw2_expand_symtabs_matching::run_test);